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Commit | Line | Data |
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af1a8899 | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
1da177e4 LT |
2 | /* |
3 | * raid5.c : Multiple Devices driver for Linux | |
4 | * Copyright (C) 1996, 1997 Ingo Molnar, Miguel de Icaza, Gadi Oxman | |
5 | * Copyright (C) 1999, 2000 Ingo Molnar | |
16a53ecc | 6 | * Copyright (C) 2002, 2003 H. Peter Anvin |
1da177e4 | 7 | * |
16a53ecc N |
8 | * RAID-4/5/6 management functions. |
9 | * Thanks to Penguin Computing for making the RAID-6 development possible | |
10 | * by donating a test server! | |
1da177e4 LT |
11 | */ |
12 | ||
ae3c20cc N |
13 | /* |
14 | * BITMAP UNPLUGGING: | |
15 | * | |
16 | * The sequencing for updating the bitmap reliably is a little | |
17 | * subtle (and I got it wrong the first time) so it deserves some | |
18 | * explanation. | |
19 | * | |
20 | * We group bitmap updates into batches. Each batch has a number. | |
21 | * We may write out several batches at once, but that isn't very important. | |
7c13edc8 N |
22 | * conf->seq_write is the number of the last batch successfully written. |
23 | * conf->seq_flush is the number of the last batch that was closed to | |
ae3c20cc N |
24 | * new additions. |
25 | * When we discover that we will need to write to any block in a stripe | |
26 | * (in add_stripe_bio) we update the in-memory bitmap and record in sh->bm_seq | |
7c13edc8 | 27 | * the number of the batch it will be in. This is seq_flush+1. |
ae3c20cc N |
28 | * When we are ready to do a write, if that batch hasn't been written yet, |
29 | * we plug the array and queue the stripe for later. | |
30 | * When an unplug happens, we increment bm_flush, thus closing the current | |
31 | * batch. | |
32 | * When we notice that bm_flush > bm_write, we write out all pending updates | |
33 | * to the bitmap, and advance bm_write to where bm_flush was. | |
34 | * This may occasionally write a bit out twice, but is sure never to | |
35 | * miss any bits. | |
36 | */ | |
1da177e4 | 37 | |
bff61975 | 38 | #include <linux/blkdev.h> |
f6705578 | 39 | #include <linux/kthread.h> |
f701d589 | 40 | #include <linux/raid/pq.h> |
91c00924 | 41 | #include <linux/async_tx.h> |
056075c7 | 42 | #include <linux/module.h> |
07a3b417 | 43 | #include <linux/async.h> |
bff61975 | 44 | #include <linux/seq_file.h> |
36d1c647 | 45 | #include <linux/cpu.h> |
5a0e3ad6 | 46 | #include <linux/slab.h> |
8bda470e | 47 | #include <linux/ratelimit.h> |
851c30c9 | 48 | #include <linux/nodemask.h> |
3f07c014 | 49 | |
a9add5d9 | 50 | #include <trace/events/block.h> |
aaf9f12e | 51 | #include <linux/list_sort.h> |
a9add5d9 | 52 | |
43b2e5d8 | 53 | #include "md.h" |
bff61975 | 54 | #include "raid5.h" |
54071b38 | 55 | #include "raid0.h" |
935fe098 | 56 | #include "md-bitmap.h" |
ff875738 | 57 | #include "raid5-log.h" |
72626685 | 58 | |
394ed8e4 SL |
59 | #define UNSUPPORTED_MDDEV_FLAGS (1L << MD_FAILFAST_SUPPORTED) |
60 | ||
851c30c9 SL |
61 | #define cpu_to_group(cpu) cpu_to_node(cpu) |
62 | #define ANY_GROUP NUMA_NO_NODE | |
63 | ||
8e0e99ba N |
64 | static bool devices_handle_discard_safely = false; |
65 | module_param(devices_handle_discard_safely, bool, 0644); | |
66 | MODULE_PARM_DESC(devices_handle_discard_safely, | |
67 | "Set to Y if all devices in each array reliably return zeroes on reads from discarded regions"); | |
851c30c9 | 68 | static struct workqueue_struct *raid5_wq; |
1da177e4 | 69 | |
d1688a6d | 70 | static inline struct hlist_head *stripe_hash(struct r5conf *conf, sector_t sect) |
db298e19 N |
71 | { |
72 | int hash = (sect >> STRIPE_SHIFT) & HASH_MASK; | |
73 | return &conf->stripe_hashtbl[hash]; | |
74 | } | |
1da177e4 | 75 | |
566c09c5 SL |
76 | static inline int stripe_hash_locks_hash(sector_t sect) |
77 | { | |
78 | return (sect >> STRIPE_SHIFT) & STRIPE_HASH_LOCKS_MASK; | |
79 | } | |
80 | ||
81 | static inline void lock_device_hash_lock(struct r5conf *conf, int hash) | |
82 | { | |
83 | spin_lock_irq(conf->hash_locks + hash); | |
84 | spin_lock(&conf->device_lock); | |
85 | } | |
86 | ||
87 | static inline void unlock_device_hash_lock(struct r5conf *conf, int hash) | |
88 | { | |
89 | spin_unlock(&conf->device_lock); | |
90 | spin_unlock_irq(conf->hash_locks + hash); | |
91 | } | |
92 | ||
93 | static inline void lock_all_device_hash_locks_irq(struct r5conf *conf) | |
94 | { | |
95 | int i; | |
3d05f3ae | 96 | spin_lock_irq(conf->hash_locks); |
566c09c5 SL |
97 | for (i = 1; i < NR_STRIPE_HASH_LOCKS; i++) |
98 | spin_lock_nest_lock(conf->hash_locks + i, conf->hash_locks); | |
99 | spin_lock(&conf->device_lock); | |
100 | } | |
101 | ||
102 | static inline void unlock_all_device_hash_locks_irq(struct r5conf *conf) | |
103 | { | |
104 | int i; | |
105 | spin_unlock(&conf->device_lock); | |
3d05f3ae JC |
106 | for (i = NR_STRIPE_HASH_LOCKS - 1; i; i--) |
107 | spin_unlock(conf->hash_locks + i); | |
108 | spin_unlock_irq(conf->hash_locks); | |
566c09c5 SL |
109 | } |
110 | ||
d0dabf7e N |
111 | /* Find first data disk in a raid6 stripe */ |
112 | static inline int raid6_d0(struct stripe_head *sh) | |
113 | { | |
67cc2b81 N |
114 | if (sh->ddf_layout) |
115 | /* ddf always start from first device */ | |
116 | return 0; | |
117 | /* md starts just after Q block */ | |
d0dabf7e N |
118 | if (sh->qd_idx == sh->disks - 1) |
119 | return 0; | |
120 | else | |
121 | return sh->qd_idx + 1; | |
122 | } | |
16a53ecc N |
123 | static inline int raid6_next_disk(int disk, int raid_disks) |
124 | { | |
125 | disk++; | |
126 | return (disk < raid_disks) ? disk : 0; | |
127 | } | |
a4456856 | 128 | |
d0dabf7e N |
129 | /* When walking through the disks in a raid5, starting at raid6_d0, |
130 | * We need to map each disk to a 'slot', where the data disks are slot | |
131 | * 0 .. raid_disks-3, the parity disk is raid_disks-2 and the Q disk | |
132 | * is raid_disks-1. This help does that mapping. | |
133 | */ | |
67cc2b81 N |
134 | static int raid6_idx_to_slot(int idx, struct stripe_head *sh, |
135 | int *count, int syndrome_disks) | |
d0dabf7e | 136 | { |
6629542e | 137 | int slot = *count; |
67cc2b81 | 138 | |
e4424fee | 139 | if (sh->ddf_layout) |
6629542e | 140 | (*count)++; |
d0dabf7e | 141 | if (idx == sh->pd_idx) |
67cc2b81 | 142 | return syndrome_disks; |
d0dabf7e | 143 | if (idx == sh->qd_idx) |
67cc2b81 | 144 | return syndrome_disks + 1; |
e4424fee | 145 | if (!sh->ddf_layout) |
6629542e | 146 | (*count)++; |
d0dabf7e N |
147 | return slot; |
148 | } | |
149 | ||
d1688a6d | 150 | static void print_raid5_conf (struct r5conf *conf); |
1da177e4 | 151 | |
600aa109 DW |
152 | static int stripe_operations_active(struct stripe_head *sh) |
153 | { | |
154 | return sh->check_state || sh->reconstruct_state || | |
155 | test_bit(STRIPE_BIOFILL_RUN, &sh->state) || | |
156 | test_bit(STRIPE_COMPUTE_RUN, &sh->state); | |
157 | } | |
158 | ||
535ae4eb SL |
159 | static bool stripe_is_lowprio(struct stripe_head *sh) |
160 | { | |
161 | return (test_bit(STRIPE_R5C_FULL_STRIPE, &sh->state) || | |
162 | test_bit(STRIPE_R5C_PARTIAL_STRIPE, &sh->state)) && | |
163 | !test_bit(STRIPE_R5C_CACHING, &sh->state); | |
164 | } | |
165 | ||
851c30c9 SL |
166 | static void raid5_wakeup_stripe_thread(struct stripe_head *sh) |
167 | { | |
168 | struct r5conf *conf = sh->raid_conf; | |
169 | struct r5worker_group *group; | |
bfc90cb0 | 170 | int thread_cnt; |
851c30c9 SL |
171 | int i, cpu = sh->cpu; |
172 | ||
173 | if (!cpu_online(cpu)) { | |
174 | cpu = cpumask_any(cpu_online_mask); | |
175 | sh->cpu = cpu; | |
176 | } | |
177 | ||
178 | if (list_empty(&sh->lru)) { | |
179 | struct r5worker_group *group; | |
180 | group = conf->worker_groups + cpu_to_group(cpu); | |
535ae4eb SL |
181 | if (stripe_is_lowprio(sh)) |
182 | list_add_tail(&sh->lru, &group->loprio_list); | |
183 | else | |
184 | list_add_tail(&sh->lru, &group->handle_list); | |
bfc90cb0 SL |
185 | group->stripes_cnt++; |
186 | sh->group = group; | |
851c30c9 SL |
187 | } |
188 | ||
189 | if (conf->worker_cnt_per_group == 0) { | |
190 | md_wakeup_thread(conf->mddev->thread); | |
191 | return; | |
192 | } | |
193 | ||
194 | group = conf->worker_groups + cpu_to_group(sh->cpu); | |
195 | ||
bfc90cb0 SL |
196 | group->workers[0].working = true; |
197 | /* at least one worker should run to avoid race */ | |
198 | queue_work_on(sh->cpu, raid5_wq, &group->workers[0].work); | |
199 | ||
200 | thread_cnt = group->stripes_cnt / MAX_STRIPE_BATCH - 1; | |
201 | /* wakeup more workers */ | |
202 | for (i = 1; i < conf->worker_cnt_per_group && thread_cnt > 0; i++) { | |
203 | if (group->workers[i].working == false) { | |
204 | group->workers[i].working = true; | |
205 | queue_work_on(sh->cpu, raid5_wq, | |
206 | &group->workers[i].work); | |
207 | thread_cnt--; | |
208 | } | |
209 | } | |
851c30c9 SL |
210 | } |
211 | ||
566c09c5 SL |
212 | static void do_release_stripe(struct r5conf *conf, struct stripe_head *sh, |
213 | struct list_head *temp_inactive_list) | |
1da177e4 | 214 | { |
1e6d690b SL |
215 | int i; |
216 | int injournal = 0; /* number of date pages with R5_InJournal */ | |
217 | ||
4eb788df SL |
218 | BUG_ON(!list_empty(&sh->lru)); |
219 | BUG_ON(atomic_read(&conf->active_stripes)==0); | |
1e6d690b SL |
220 | |
221 | if (r5c_is_writeback(conf->log)) | |
222 | for (i = sh->disks; i--; ) | |
223 | if (test_bit(R5_InJournal, &sh->dev[i].flags)) | |
224 | injournal++; | |
a39f7afd | 225 | /* |
5ddf0440 SL |
226 | * In the following cases, the stripe cannot be released to cached |
227 | * lists. Therefore, we make the stripe write out and set | |
228 | * STRIPE_HANDLE: | |
229 | * 1. when quiesce in r5c write back; | |
230 | * 2. when resync is requested fot the stripe. | |
a39f7afd | 231 | */ |
5ddf0440 SL |
232 | if (test_bit(STRIPE_SYNC_REQUESTED, &sh->state) || |
233 | (conf->quiesce && r5c_is_writeback(conf->log) && | |
234 | !test_bit(STRIPE_HANDLE, &sh->state) && injournal != 0)) { | |
a39f7afd SL |
235 | if (test_bit(STRIPE_R5C_CACHING, &sh->state)) |
236 | r5c_make_stripe_write_out(sh); | |
237 | set_bit(STRIPE_HANDLE, &sh->state); | |
238 | } | |
1e6d690b | 239 | |
4eb788df SL |
240 | if (test_bit(STRIPE_HANDLE, &sh->state)) { |
241 | if (test_bit(STRIPE_DELAYED, &sh->state) && | |
ad3ab8b6 | 242 | !test_bit(STRIPE_PREREAD_ACTIVE, &sh->state)) |
4eb788df | 243 | list_add_tail(&sh->lru, &conf->delayed_list); |
ad3ab8b6 | 244 | else if (test_bit(STRIPE_BIT_DELAY, &sh->state) && |
4eb788df SL |
245 | sh->bm_seq - conf->seq_write > 0) |
246 | list_add_tail(&sh->lru, &conf->bitmap_list); | |
247 | else { | |
248 | clear_bit(STRIPE_DELAYED, &sh->state); | |
249 | clear_bit(STRIPE_BIT_DELAY, &sh->state); | |
851c30c9 | 250 | if (conf->worker_cnt_per_group == 0) { |
535ae4eb SL |
251 | if (stripe_is_lowprio(sh)) |
252 | list_add_tail(&sh->lru, | |
253 | &conf->loprio_list); | |
254 | else | |
255 | list_add_tail(&sh->lru, | |
256 | &conf->handle_list); | |
851c30c9 SL |
257 | } else { |
258 | raid5_wakeup_stripe_thread(sh); | |
259 | return; | |
260 | } | |
4eb788df SL |
261 | } |
262 | md_wakeup_thread(conf->mddev->thread); | |
263 | } else { | |
264 | BUG_ON(stripe_operations_active(sh)); | |
265 | if (test_and_clear_bit(STRIPE_PREREAD_ACTIVE, &sh->state)) | |
266 | if (atomic_dec_return(&conf->preread_active_stripes) | |
267 | < IO_THRESHOLD) | |
268 | md_wakeup_thread(conf->mddev->thread); | |
269 | atomic_dec(&conf->active_stripes); | |
1e6d690b SL |
270 | if (!test_bit(STRIPE_EXPANDING, &sh->state)) { |
271 | if (!r5c_is_writeback(conf->log)) | |
272 | list_add_tail(&sh->lru, temp_inactive_list); | |
273 | else { | |
274 | WARN_ON(test_bit(R5_InJournal, &sh->dev[sh->pd_idx].flags)); | |
275 | if (injournal == 0) | |
276 | list_add_tail(&sh->lru, temp_inactive_list); | |
277 | else if (injournal == conf->raid_disks - conf->max_degraded) { | |
278 | /* full stripe */ | |
279 | if (!test_and_set_bit(STRIPE_R5C_FULL_STRIPE, &sh->state)) | |
280 | atomic_inc(&conf->r5c_cached_full_stripes); | |
281 | if (test_and_clear_bit(STRIPE_R5C_PARTIAL_STRIPE, &sh->state)) | |
282 | atomic_dec(&conf->r5c_cached_partial_stripes); | |
283 | list_add_tail(&sh->lru, &conf->r5c_full_stripe_list); | |
a39f7afd | 284 | r5c_check_cached_full_stripe(conf); |
03b047f4 SL |
285 | } else |
286 | /* | |
287 | * STRIPE_R5C_PARTIAL_STRIPE is set in | |
288 | * r5c_try_caching_write(). No need to | |
289 | * set it again. | |
290 | */ | |
1e6d690b | 291 | list_add_tail(&sh->lru, &conf->r5c_partial_stripe_list); |
1e6d690b SL |
292 | } |
293 | } | |
1da177e4 LT |
294 | } |
295 | } | |
d0dabf7e | 296 | |
566c09c5 SL |
297 | static void __release_stripe(struct r5conf *conf, struct stripe_head *sh, |
298 | struct list_head *temp_inactive_list) | |
4eb788df SL |
299 | { |
300 | if (atomic_dec_and_test(&sh->count)) | |
566c09c5 SL |
301 | do_release_stripe(conf, sh, temp_inactive_list); |
302 | } | |
303 | ||
304 | /* | |
305 | * @hash could be NR_STRIPE_HASH_LOCKS, then we have a list of inactive_list | |
306 | * | |
307 | * Be careful: Only one task can add/delete stripes from temp_inactive_list at | |
308 | * given time. Adding stripes only takes device lock, while deleting stripes | |
309 | * only takes hash lock. | |
310 | */ | |
311 | static void release_inactive_stripe_list(struct r5conf *conf, | |
312 | struct list_head *temp_inactive_list, | |
313 | int hash) | |
314 | { | |
315 | int size; | |
6ab2a4b8 | 316 | bool do_wakeup = false; |
566c09c5 SL |
317 | unsigned long flags; |
318 | ||
319 | if (hash == NR_STRIPE_HASH_LOCKS) { | |
320 | size = NR_STRIPE_HASH_LOCKS; | |
321 | hash = NR_STRIPE_HASH_LOCKS - 1; | |
322 | } else | |
323 | size = 1; | |
324 | while (size) { | |
325 | struct list_head *list = &temp_inactive_list[size - 1]; | |
326 | ||
327 | /* | |
6d036f7d | 328 | * We don't hold any lock here yet, raid5_get_active_stripe() might |
566c09c5 SL |
329 | * remove stripes from the list |
330 | */ | |
331 | if (!list_empty_careful(list)) { | |
332 | spin_lock_irqsave(conf->hash_locks + hash, flags); | |
4bda556a SL |
333 | if (list_empty(conf->inactive_list + hash) && |
334 | !list_empty(list)) | |
335 | atomic_dec(&conf->empty_inactive_list_nr); | |
566c09c5 | 336 | list_splice_tail_init(list, conf->inactive_list + hash); |
6ab2a4b8 | 337 | do_wakeup = true; |
566c09c5 SL |
338 | spin_unlock_irqrestore(conf->hash_locks + hash, flags); |
339 | } | |
340 | size--; | |
341 | hash--; | |
342 | } | |
343 | ||
344 | if (do_wakeup) { | |
6ab2a4b8 | 345 | wake_up(&conf->wait_for_stripe); |
b1b46486 YL |
346 | if (atomic_read(&conf->active_stripes) == 0) |
347 | wake_up(&conf->wait_for_quiescent); | |
566c09c5 SL |
348 | if (conf->retry_read_aligned) |
349 | md_wakeup_thread(conf->mddev->thread); | |
350 | } | |
4eb788df SL |
351 | } |
352 | ||
773ca82f | 353 | /* should hold conf->device_lock already */ |
566c09c5 SL |
354 | static int release_stripe_list(struct r5conf *conf, |
355 | struct list_head *temp_inactive_list) | |
773ca82f | 356 | { |
eae8263f | 357 | struct stripe_head *sh, *t; |
773ca82f SL |
358 | int count = 0; |
359 | struct llist_node *head; | |
360 | ||
361 | head = llist_del_all(&conf->released_stripes); | |
d265d9dc | 362 | head = llist_reverse_order(head); |
eae8263f | 363 | llist_for_each_entry_safe(sh, t, head, release_list) { |
566c09c5 SL |
364 | int hash; |
365 | ||
773ca82f SL |
366 | /* sh could be readded after STRIPE_ON_RELEASE_LIST is cleard */ |
367 | smp_mb(); | |
368 | clear_bit(STRIPE_ON_RELEASE_LIST, &sh->state); | |
369 | /* | |
370 | * Don't worry the bit is set here, because if the bit is set | |
371 | * again, the count is always > 1. This is true for | |
372 | * STRIPE_ON_UNPLUG_LIST bit too. | |
373 | */ | |
566c09c5 SL |
374 | hash = sh->hash_lock_index; |
375 | __release_stripe(conf, sh, &temp_inactive_list[hash]); | |
773ca82f SL |
376 | count++; |
377 | } | |
378 | ||
379 | return count; | |
380 | } | |
381 | ||
6d036f7d | 382 | void raid5_release_stripe(struct stripe_head *sh) |
1da177e4 | 383 | { |
d1688a6d | 384 | struct r5conf *conf = sh->raid_conf; |
1da177e4 | 385 | unsigned long flags; |
566c09c5 SL |
386 | struct list_head list; |
387 | int hash; | |
773ca82f | 388 | bool wakeup; |
16a53ecc | 389 | |
cf170f3f ES |
390 | /* Avoid release_list until the last reference. |
391 | */ | |
392 | if (atomic_add_unless(&sh->count, -1, 1)) | |
393 | return; | |
394 | ||
ad4068de | 395 | if (unlikely(!conf->mddev->thread) || |
396 | test_and_set_bit(STRIPE_ON_RELEASE_LIST, &sh->state)) | |
773ca82f SL |
397 | goto slow_path; |
398 | wakeup = llist_add(&sh->release_list, &conf->released_stripes); | |
399 | if (wakeup) | |
400 | md_wakeup_thread(conf->mddev->thread); | |
401 | return; | |
402 | slow_path: | |
773ca82f | 403 | /* we are ok here if STRIPE_ON_RELEASE_LIST is set or not */ |
685dbcaa | 404 | if (atomic_dec_and_lock_irqsave(&sh->count, &conf->device_lock, flags)) { |
566c09c5 SL |
405 | INIT_LIST_HEAD(&list); |
406 | hash = sh->hash_lock_index; | |
407 | do_release_stripe(conf, sh, &list); | |
08edaaa6 | 408 | spin_unlock_irqrestore(&conf->device_lock, flags); |
566c09c5 | 409 | release_inactive_stripe_list(conf, &list, hash); |
4eb788df | 410 | } |
1da177e4 LT |
411 | } |
412 | ||
fccddba0 | 413 | static inline void remove_hash(struct stripe_head *sh) |
1da177e4 | 414 | { |
45b4233c DW |
415 | pr_debug("remove_hash(), stripe %llu\n", |
416 | (unsigned long long)sh->sector); | |
1da177e4 | 417 | |
fccddba0 | 418 | hlist_del_init(&sh->hash); |
1da177e4 LT |
419 | } |
420 | ||
d1688a6d | 421 | static inline void insert_hash(struct r5conf *conf, struct stripe_head *sh) |
1da177e4 | 422 | { |
fccddba0 | 423 | struct hlist_head *hp = stripe_hash(conf, sh->sector); |
1da177e4 | 424 | |
45b4233c DW |
425 | pr_debug("insert_hash(), stripe %llu\n", |
426 | (unsigned long long)sh->sector); | |
1da177e4 | 427 | |
fccddba0 | 428 | hlist_add_head(&sh->hash, hp); |
1da177e4 LT |
429 | } |
430 | ||
1da177e4 | 431 | /* find an idle stripe, make sure it is unhashed, and return it. */ |
566c09c5 | 432 | static struct stripe_head *get_free_stripe(struct r5conf *conf, int hash) |
1da177e4 LT |
433 | { |
434 | struct stripe_head *sh = NULL; | |
435 | struct list_head *first; | |
436 | ||
566c09c5 | 437 | if (list_empty(conf->inactive_list + hash)) |
1da177e4 | 438 | goto out; |
566c09c5 | 439 | first = (conf->inactive_list + hash)->next; |
1da177e4 LT |
440 | sh = list_entry(first, struct stripe_head, lru); |
441 | list_del_init(first); | |
442 | remove_hash(sh); | |
443 | atomic_inc(&conf->active_stripes); | |
566c09c5 | 444 | BUG_ON(hash != sh->hash_lock_index); |
4bda556a SL |
445 | if (list_empty(conf->inactive_list + hash)) |
446 | atomic_inc(&conf->empty_inactive_list_nr); | |
1da177e4 LT |
447 | out: |
448 | return sh; | |
449 | } | |
450 | ||
e4e11e38 | 451 | static void shrink_buffers(struct stripe_head *sh) |
1da177e4 LT |
452 | { |
453 | struct page *p; | |
454 | int i; | |
e4e11e38 | 455 | int num = sh->raid_conf->pool_size; |
1da177e4 | 456 | |
e4e11e38 | 457 | for (i = 0; i < num ; i++) { |
d592a996 | 458 | WARN_ON(sh->dev[i].page != sh->dev[i].orig_page); |
1da177e4 LT |
459 | p = sh->dev[i].page; |
460 | if (!p) | |
461 | continue; | |
462 | sh->dev[i].page = NULL; | |
2d1f3b5d | 463 | put_page(p); |
1da177e4 LT |
464 | } |
465 | } | |
466 | ||
a9683a79 | 467 | static int grow_buffers(struct stripe_head *sh, gfp_t gfp) |
1da177e4 LT |
468 | { |
469 | int i; | |
e4e11e38 | 470 | int num = sh->raid_conf->pool_size; |
1da177e4 | 471 | |
e4e11e38 | 472 | for (i = 0; i < num; i++) { |
1da177e4 LT |
473 | struct page *page; |
474 | ||
a9683a79 | 475 | if (!(page = alloc_page(gfp))) { |
1da177e4 LT |
476 | return 1; |
477 | } | |
478 | sh->dev[i].page = page; | |
d592a996 | 479 | sh->dev[i].orig_page = page; |
1da177e4 | 480 | } |
3418d036 | 481 | |
1da177e4 LT |
482 | return 0; |
483 | } | |
484 | ||
d1688a6d | 485 | static void stripe_set_idx(sector_t stripe, struct r5conf *conf, int previous, |
911d4ee8 | 486 | struct stripe_head *sh); |
1da177e4 | 487 | |
b5663ba4 | 488 | static void init_stripe(struct stripe_head *sh, sector_t sector, int previous) |
1da177e4 | 489 | { |
d1688a6d | 490 | struct r5conf *conf = sh->raid_conf; |
566c09c5 | 491 | int i, seq; |
1da177e4 | 492 | |
78bafebd ES |
493 | BUG_ON(atomic_read(&sh->count) != 0); |
494 | BUG_ON(test_bit(STRIPE_HANDLE, &sh->state)); | |
600aa109 | 495 | BUG_ON(stripe_operations_active(sh)); |
59fc630b | 496 | BUG_ON(sh->batch_head); |
d84e0f10 | 497 | |
45b4233c | 498 | pr_debug("init_stripe called, stripe %llu\n", |
b8e6a15a | 499 | (unsigned long long)sector); |
566c09c5 SL |
500 | retry: |
501 | seq = read_seqcount_begin(&conf->gen_lock); | |
86b42c71 | 502 | sh->generation = conf->generation - previous; |
b5663ba4 | 503 | sh->disks = previous ? conf->previous_raid_disks : conf->raid_disks; |
1da177e4 | 504 | sh->sector = sector; |
911d4ee8 | 505 | stripe_set_idx(sector, conf, previous, sh); |
1da177e4 LT |
506 | sh->state = 0; |
507 | ||
7ecaa1e6 | 508 | for (i = sh->disks; i--; ) { |
1da177e4 LT |
509 | struct r5dev *dev = &sh->dev[i]; |
510 | ||
d84e0f10 | 511 | if (dev->toread || dev->read || dev->towrite || dev->written || |
1da177e4 | 512 | test_bit(R5_LOCKED, &dev->flags)) { |
cc6167b4 | 513 | pr_err("sector=%llx i=%d %p %p %p %p %d\n", |
1da177e4 | 514 | (unsigned long long)sh->sector, i, dev->toread, |
d84e0f10 | 515 | dev->read, dev->towrite, dev->written, |
1da177e4 | 516 | test_bit(R5_LOCKED, &dev->flags)); |
8cfa7b0f | 517 | WARN_ON(1); |
1da177e4 LT |
518 | } |
519 | dev->flags = 0; | |
27a4ff8f | 520 | dev->sector = raid5_compute_blocknr(sh, i, previous); |
1da177e4 | 521 | } |
566c09c5 SL |
522 | if (read_seqcount_retry(&conf->gen_lock, seq)) |
523 | goto retry; | |
7a87f434 | 524 | sh->overwrite_disks = 0; |
1da177e4 | 525 | insert_hash(conf, sh); |
851c30c9 | 526 | sh->cpu = smp_processor_id(); |
da41ba65 | 527 | set_bit(STRIPE_BATCH_READY, &sh->state); |
1da177e4 LT |
528 | } |
529 | ||
d1688a6d | 530 | static struct stripe_head *__find_stripe(struct r5conf *conf, sector_t sector, |
86b42c71 | 531 | short generation) |
1da177e4 LT |
532 | { |
533 | struct stripe_head *sh; | |
534 | ||
45b4233c | 535 | pr_debug("__find_stripe, sector %llu\n", (unsigned long long)sector); |
b67bfe0d | 536 | hlist_for_each_entry(sh, stripe_hash(conf, sector), hash) |
86b42c71 | 537 | if (sh->sector == sector && sh->generation == generation) |
1da177e4 | 538 | return sh; |
45b4233c | 539 | pr_debug("__stripe %llu not in cache\n", (unsigned long long)sector); |
1da177e4 LT |
540 | return NULL; |
541 | } | |
542 | ||
674806d6 N |
543 | /* |
544 | * Need to check if array has failed when deciding whether to: | |
545 | * - start an array | |
546 | * - remove non-faulty devices | |
547 | * - add a spare | |
548 | * - allow a reshape | |
549 | * This determination is simple when no reshape is happening. | |
550 | * However if there is a reshape, we need to carefully check | |
551 | * both the before and after sections. | |
552 | * This is because some failed devices may only affect one | |
553 | * of the two sections, and some non-in_sync devices may | |
554 | * be insync in the section most affected by failed devices. | |
555 | */ | |
2e38a37f | 556 | int raid5_calc_degraded(struct r5conf *conf) |
674806d6 | 557 | { |
908f4fbd | 558 | int degraded, degraded2; |
674806d6 | 559 | int i; |
674806d6 N |
560 | |
561 | rcu_read_lock(); | |
562 | degraded = 0; | |
563 | for (i = 0; i < conf->previous_raid_disks; i++) { | |
3cb03002 | 564 | struct md_rdev *rdev = rcu_dereference(conf->disks[i].rdev); |
e5c86471 N |
565 | if (rdev && test_bit(Faulty, &rdev->flags)) |
566 | rdev = rcu_dereference(conf->disks[i].replacement); | |
674806d6 N |
567 | if (!rdev || test_bit(Faulty, &rdev->flags)) |
568 | degraded++; | |
569 | else if (test_bit(In_sync, &rdev->flags)) | |
570 | ; | |
571 | else | |
572 | /* not in-sync or faulty. | |
573 | * If the reshape increases the number of devices, | |
574 | * this is being recovered by the reshape, so | |
575 | * this 'previous' section is not in_sync. | |
576 | * If the number of devices is being reduced however, | |
577 | * the device can only be part of the array if | |
578 | * we are reverting a reshape, so this section will | |
579 | * be in-sync. | |
580 | */ | |
581 | if (conf->raid_disks >= conf->previous_raid_disks) | |
582 | degraded++; | |
583 | } | |
584 | rcu_read_unlock(); | |
908f4fbd N |
585 | if (conf->raid_disks == conf->previous_raid_disks) |
586 | return degraded; | |
674806d6 | 587 | rcu_read_lock(); |
908f4fbd | 588 | degraded2 = 0; |
674806d6 | 589 | for (i = 0; i < conf->raid_disks; i++) { |
3cb03002 | 590 | struct md_rdev *rdev = rcu_dereference(conf->disks[i].rdev); |
e5c86471 N |
591 | if (rdev && test_bit(Faulty, &rdev->flags)) |
592 | rdev = rcu_dereference(conf->disks[i].replacement); | |
674806d6 | 593 | if (!rdev || test_bit(Faulty, &rdev->flags)) |
908f4fbd | 594 | degraded2++; |
674806d6 N |
595 | else if (test_bit(In_sync, &rdev->flags)) |
596 | ; | |
597 | else | |
598 | /* not in-sync or faulty. | |
599 | * If reshape increases the number of devices, this | |
600 | * section has already been recovered, else it | |
601 | * almost certainly hasn't. | |
602 | */ | |
603 | if (conf->raid_disks <= conf->previous_raid_disks) | |
908f4fbd | 604 | degraded2++; |
674806d6 N |
605 | } |
606 | rcu_read_unlock(); | |
908f4fbd N |
607 | if (degraded2 > degraded) |
608 | return degraded2; | |
609 | return degraded; | |
610 | } | |
611 | ||
612 | static int has_failed(struct r5conf *conf) | |
613 | { | |
614 | int degraded; | |
615 | ||
616 | if (conf->mddev->reshape_position == MaxSector) | |
617 | return conf->mddev->degraded > conf->max_degraded; | |
618 | ||
2e38a37f | 619 | degraded = raid5_calc_degraded(conf); |
674806d6 N |
620 | if (degraded > conf->max_degraded) |
621 | return 1; | |
622 | return 0; | |
623 | } | |
624 | ||
6d036f7d SL |
625 | struct stripe_head * |
626 | raid5_get_active_stripe(struct r5conf *conf, sector_t sector, | |
627 | int previous, int noblock, int noquiesce) | |
1da177e4 LT |
628 | { |
629 | struct stripe_head *sh; | |
566c09c5 | 630 | int hash = stripe_hash_locks_hash(sector); |
ff00d3b4 | 631 | int inc_empty_inactive_list_flag; |
1da177e4 | 632 | |
45b4233c | 633 | pr_debug("get_stripe, sector %llu\n", (unsigned long long)sector); |
1da177e4 | 634 | |
566c09c5 | 635 | spin_lock_irq(conf->hash_locks + hash); |
1da177e4 LT |
636 | |
637 | do { | |
b1b46486 | 638 | wait_event_lock_irq(conf->wait_for_quiescent, |
a8c906ca | 639 | conf->quiesce == 0 || noquiesce, |
566c09c5 | 640 | *(conf->hash_locks + hash)); |
86b42c71 | 641 | sh = __find_stripe(conf, sector, conf->generation - previous); |
1da177e4 | 642 | if (!sh) { |
edbe83ab | 643 | if (!test_bit(R5_INACTIVE_BLOCKED, &conf->cache_state)) { |
566c09c5 | 644 | sh = get_free_stripe(conf, hash); |
713bc5c2 SL |
645 | if (!sh && !test_bit(R5_DID_ALLOC, |
646 | &conf->cache_state)) | |
edbe83ab N |
647 | set_bit(R5_ALLOC_MORE, |
648 | &conf->cache_state); | |
649 | } | |
1da177e4 LT |
650 | if (noblock && sh == NULL) |
651 | break; | |
a39f7afd SL |
652 | |
653 | r5c_check_stripe_cache_usage(conf); | |
1da177e4 | 654 | if (!sh) { |
5423399a N |
655 | set_bit(R5_INACTIVE_BLOCKED, |
656 | &conf->cache_state); | |
a39f7afd | 657 | r5l_wake_reclaim(conf->log, 0); |
6ab2a4b8 SL |
658 | wait_event_lock_irq( |
659 | conf->wait_for_stripe, | |
566c09c5 SL |
660 | !list_empty(conf->inactive_list + hash) && |
661 | (atomic_read(&conf->active_stripes) | |
662 | < (conf->max_nr_stripes * 3 / 4) | |
5423399a N |
663 | || !test_bit(R5_INACTIVE_BLOCKED, |
664 | &conf->cache_state)), | |
6ab2a4b8 | 665 | *(conf->hash_locks + hash)); |
5423399a N |
666 | clear_bit(R5_INACTIVE_BLOCKED, |
667 | &conf->cache_state); | |
7da9d450 | 668 | } else { |
b5663ba4 | 669 | init_stripe(sh, sector, previous); |
7da9d450 N |
670 | atomic_inc(&sh->count); |
671 | } | |
e240c183 | 672 | } else if (!atomic_inc_not_zero(&sh->count)) { |
6d183de4 | 673 | spin_lock(&conf->device_lock); |
e240c183 | 674 | if (!atomic_read(&sh->count)) { |
1da177e4 LT |
675 | if (!test_bit(STRIPE_HANDLE, &sh->state)) |
676 | atomic_inc(&conf->active_stripes); | |
5af9bef7 N |
677 | BUG_ON(list_empty(&sh->lru) && |
678 | !test_bit(STRIPE_EXPANDING, &sh->state)); | |
ff00d3b4 ZL |
679 | inc_empty_inactive_list_flag = 0; |
680 | if (!list_empty(conf->inactive_list + hash)) | |
681 | inc_empty_inactive_list_flag = 1; | |
16a53ecc | 682 | list_del_init(&sh->lru); |
ff00d3b4 ZL |
683 | if (list_empty(conf->inactive_list + hash) && inc_empty_inactive_list_flag) |
684 | atomic_inc(&conf->empty_inactive_list_nr); | |
bfc90cb0 SL |
685 | if (sh->group) { |
686 | sh->group->stripes_cnt--; | |
687 | sh->group = NULL; | |
688 | } | |
1da177e4 | 689 | } |
7da9d450 | 690 | atomic_inc(&sh->count); |
6d183de4 | 691 | spin_unlock(&conf->device_lock); |
1da177e4 LT |
692 | } |
693 | } while (sh == NULL); | |
694 | ||
566c09c5 | 695 | spin_unlock_irq(conf->hash_locks + hash); |
1da177e4 LT |
696 | return sh; |
697 | } | |
698 | ||
7a87f434 | 699 | static bool is_full_stripe_write(struct stripe_head *sh) |
700 | { | |
701 | BUG_ON(sh->overwrite_disks > (sh->disks - sh->raid_conf->max_degraded)); | |
702 | return sh->overwrite_disks == (sh->disks - sh->raid_conf->max_degraded); | |
703 | } | |
704 | ||
59fc630b | 705 | static void lock_two_stripes(struct stripe_head *sh1, struct stripe_head *sh2) |
368ecade CH |
706 | __acquires(&sh1->stripe_lock) |
707 | __acquires(&sh2->stripe_lock) | |
59fc630b | 708 | { |
59fc630b | 709 | if (sh1 > sh2) { |
3d05f3ae | 710 | spin_lock_irq(&sh2->stripe_lock); |
59fc630b | 711 | spin_lock_nested(&sh1->stripe_lock, 1); |
712 | } else { | |
3d05f3ae | 713 | spin_lock_irq(&sh1->stripe_lock); |
59fc630b | 714 | spin_lock_nested(&sh2->stripe_lock, 1); |
715 | } | |
716 | } | |
717 | ||
718 | static void unlock_two_stripes(struct stripe_head *sh1, struct stripe_head *sh2) | |
368ecade CH |
719 | __releases(&sh1->stripe_lock) |
720 | __releases(&sh2->stripe_lock) | |
59fc630b | 721 | { |
722 | spin_unlock(&sh1->stripe_lock); | |
3d05f3ae | 723 | spin_unlock_irq(&sh2->stripe_lock); |
59fc630b | 724 | } |
725 | ||
726 | /* Only freshly new full stripe normal write stripe can be added to a batch list */ | |
727 | static bool stripe_can_batch(struct stripe_head *sh) | |
728 | { | |
9c3e333d SL |
729 | struct r5conf *conf = sh->raid_conf; |
730 | ||
e254de6b | 731 | if (raid5_has_log(conf) || raid5_has_ppl(conf)) |
9c3e333d | 732 | return false; |
59fc630b | 733 | return test_bit(STRIPE_BATCH_READY, &sh->state) && |
d0852df5 | 734 | !test_bit(STRIPE_BITMAP_PENDING, &sh->state) && |
59fc630b | 735 | is_full_stripe_write(sh); |
736 | } | |
737 | ||
738 | /* we only do back search */ | |
739 | static void stripe_add_to_batch_list(struct r5conf *conf, struct stripe_head *sh) | |
740 | { | |
741 | struct stripe_head *head; | |
742 | sector_t head_sector, tmp_sec; | |
743 | int hash; | |
744 | int dd_idx; | |
ff00d3b4 | 745 | int inc_empty_inactive_list_flag; |
59fc630b | 746 | |
59fc630b | 747 | /* Don't cross chunks, so stripe pd_idx/qd_idx is the same */ |
748 | tmp_sec = sh->sector; | |
749 | if (!sector_div(tmp_sec, conf->chunk_sectors)) | |
750 | return; | |
751 | head_sector = sh->sector - STRIPE_SECTORS; | |
752 | ||
753 | hash = stripe_hash_locks_hash(head_sector); | |
754 | spin_lock_irq(conf->hash_locks + hash); | |
755 | head = __find_stripe(conf, head_sector, conf->generation); | |
756 | if (head && !atomic_inc_not_zero(&head->count)) { | |
757 | spin_lock(&conf->device_lock); | |
758 | if (!atomic_read(&head->count)) { | |
759 | if (!test_bit(STRIPE_HANDLE, &head->state)) | |
760 | atomic_inc(&conf->active_stripes); | |
761 | BUG_ON(list_empty(&head->lru) && | |
762 | !test_bit(STRIPE_EXPANDING, &head->state)); | |
ff00d3b4 ZL |
763 | inc_empty_inactive_list_flag = 0; |
764 | if (!list_empty(conf->inactive_list + hash)) | |
765 | inc_empty_inactive_list_flag = 1; | |
59fc630b | 766 | list_del_init(&head->lru); |
ff00d3b4 ZL |
767 | if (list_empty(conf->inactive_list + hash) && inc_empty_inactive_list_flag) |
768 | atomic_inc(&conf->empty_inactive_list_nr); | |
59fc630b | 769 | if (head->group) { |
770 | head->group->stripes_cnt--; | |
771 | head->group = NULL; | |
772 | } | |
773 | } | |
774 | atomic_inc(&head->count); | |
775 | spin_unlock(&conf->device_lock); | |
776 | } | |
777 | spin_unlock_irq(conf->hash_locks + hash); | |
778 | ||
779 | if (!head) | |
780 | return; | |
781 | if (!stripe_can_batch(head)) | |
782 | goto out; | |
783 | ||
784 | lock_two_stripes(head, sh); | |
785 | /* clear_batch_ready clear the flag */ | |
786 | if (!stripe_can_batch(head) || !stripe_can_batch(sh)) | |
787 | goto unlock_out; | |
788 | ||
789 | if (sh->batch_head) | |
790 | goto unlock_out; | |
791 | ||
792 | dd_idx = 0; | |
793 | while (dd_idx == sh->pd_idx || dd_idx == sh->qd_idx) | |
794 | dd_idx++; | |
1eff9d32 | 795 | if (head->dev[dd_idx].towrite->bi_opf != sh->dev[dd_idx].towrite->bi_opf || |
796a5cf0 | 796 | bio_op(head->dev[dd_idx].towrite) != bio_op(sh->dev[dd_idx].towrite)) |
59fc630b | 797 | goto unlock_out; |
798 | ||
799 | if (head->batch_head) { | |
800 | spin_lock(&head->batch_head->batch_lock); | |
801 | /* This batch list is already running */ | |
802 | if (!stripe_can_batch(head)) { | |
803 | spin_unlock(&head->batch_head->batch_lock); | |
804 | goto unlock_out; | |
805 | } | |
3664847d SL |
806 | /* |
807 | * We must assign batch_head of this stripe within the | |
808 | * batch_lock, otherwise clear_batch_ready of batch head | |
809 | * stripe could clear BATCH_READY bit of this stripe and | |
810 | * this stripe->batch_head doesn't get assigned, which | |
811 | * could confuse clear_batch_ready for this stripe | |
812 | */ | |
813 | sh->batch_head = head->batch_head; | |
59fc630b | 814 | |
815 | /* | |
816 | * at this point, head's BATCH_READY could be cleared, but we | |
817 | * can still add the stripe to batch list | |
818 | */ | |
819 | list_add(&sh->batch_list, &head->batch_list); | |
820 | spin_unlock(&head->batch_head->batch_lock); | |
59fc630b | 821 | } else { |
822 | head->batch_head = head; | |
823 | sh->batch_head = head->batch_head; | |
824 | spin_lock(&head->batch_lock); | |
825 | list_add_tail(&sh->batch_list, &head->batch_list); | |
826 | spin_unlock(&head->batch_lock); | |
827 | } | |
828 | ||
829 | if (test_and_clear_bit(STRIPE_PREREAD_ACTIVE, &sh->state)) | |
830 | if (atomic_dec_return(&conf->preread_active_stripes) | |
831 | < IO_THRESHOLD) | |
832 | md_wakeup_thread(conf->mddev->thread); | |
833 | ||
2b6b2457 N |
834 | if (test_and_clear_bit(STRIPE_BIT_DELAY, &sh->state)) { |
835 | int seq = sh->bm_seq; | |
836 | if (test_bit(STRIPE_BIT_DELAY, &sh->batch_head->state) && | |
837 | sh->batch_head->bm_seq > seq) | |
838 | seq = sh->batch_head->bm_seq; | |
839 | set_bit(STRIPE_BIT_DELAY, &sh->batch_head->state); | |
840 | sh->batch_head->bm_seq = seq; | |
841 | } | |
842 | ||
59fc630b | 843 | atomic_inc(&sh->count); |
844 | unlock_out: | |
845 | unlock_two_stripes(head, sh); | |
846 | out: | |
6d036f7d | 847 | raid5_release_stripe(head); |
59fc630b | 848 | } |
849 | ||
05616be5 N |
850 | /* Determine if 'data_offset' or 'new_data_offset' should be used |
851 | * in this stripe_head. | |
852 | */ | |
853 | static int use_new_offset(struct r5conf *conf, struct stripe_head *sh) | |
854 | { | |
855 | sector_t progress = conf->reshape_progress; | |
856 | /* Need a memory barrier to make sure we see the value | |
857 | * of conf->generation, or ->data_offset that was set before | |
858 | * reshape_progress was updated. | |
859 | */ | |
860 | smp_rmb(); | |
861 | if (progress == MaxSector) | |
862 | return 0; | |
863 | if (sh->generation == conf->generation - 1) | |
864 | return 0; | |
865 | /* We are in a reshape, and this is a new-generation stripe, | |
866 | * so use new_data_offset. | |
867 | */ | |
868 | return 1; | |
869 | } | |
870 | ||
aaf9f12e | 871 | static void dispatch_bio_list(struct bio_list *tmp) |
765d704d | 872 | { |
765d704d SL |
873 | struct bio *bio; |
874 | ||
aaf9f12e SL |
875 | while ((bio = bio_list_pop(tmp))) |
876 | generic_make_request(bio); | |
877 | } | |
878 | ||
879 | static int cmp_stripe(void *priv, struct list_head *a, struct list_head *b) | |
880 | { | |
881 | const struct r5pending_data *da = list_entry(a, | |
882 | struct r5pending_data, sibling); | |
883 | const struct r5pending_data *db = list_entry(b, | |
884 | struct r5pending_data, sibling); | |
885 | if (da->sector > db->sector) | |
886 | return 1; | |
887 | if (da->sector < db->sector) | |
888 | return -1; | |
889 | return 0; | |
890 | } | |
891 | ||
892 | static void dispatch_defer_bios(struct r5conf *conf, int target, | |
893 | struct bio_list *list) | |
894 | { | |
895 | struct r5pending_data *data; | |
896 | struct list_head *first, *next = NULL; | |
897 | int cnt = 0; | |
898 | ||
899 | if (conf->pending_data_cnt == 0) | |
900 | return; | |
901 | ||
902 | list_sort(NULL, &conf->pending_list, cmp_stripe); | |
903 | ||
904 | first = conf->pending_list.next; | |
905 | ||
906 | /* temporarily move the head */ | |
907 | if (conf->next_pending_data) | |
908 | list_move_tail(&conf->pending_list, | |
909 | &conf->next_pending_data->sibling); | |
910 | ||
911 | while (!list_empty(&conf->pending_list)) { | |
912 | data = list_first_entry(&conf->pending_list, | |
913 | struct r5pending_data, sibling); | |
914 | if (&data->sibling == first) | |
915 | first = data->sibling.next; | |
916 | next = data->sibling.next; | |
917 | ||
918 | bio_list_merge(list, &data->bios); | |
919 | list_move(&data->sibling, &conf->free_list); | |
920 | cnt++; | |
921 | if (cnt >= target) | |
922 | break; | |
923 | } | |
924 | conf->pending_data_cnt -= cnt; | |
925 | BUG_ON(conf->pending_data_cnt < 0 || cnt < target); | |
926 | ||
927 | if (next != &conf->pending_list) | |
928 | conf->next_pending_data = list_entry(next, | |
929 | struct r5pending_data, sibling); | |
930 | else | |
931 | conf->next_pending_data = NULL; | |
932 | /* list isn't empty */ | |
933 | if (first != &conf->pending_list) | |
934 | list_move_tail(&conf->pending_list, first); | |
935 | } | |
936 | ||
937 | static void flush_deferred_bios(struct r5conf *conf) | |
938 | { | |
939 | struct bio_list tmp = BIO_EMPTY_LIST; | |
940 | ||
941 | if (conf->pending_data_cnt == 0) | |
765d704d SL |
942 | return; |
943 | ||
765d704d | 944 | spin_lock(&conf->pending_bios_lock); |
aaf9f12e SL |
945 | dispatch_defer_bios(conf, conf->pending_data_cnt, &tmp); |
946 | BUG_ON(conf->pending_data_cnt != 0); | |
765d704d SL |
947 | spin_unlock(&conf->pending_bios_lock); |
948 | ||
aaf9f12e | 949 | dispatch_bio_list(&tmp); |
765d704d SL |
950 | } |
951 | ||
aaf9f12e SL |
952 | static void defer_issue_bios(struct r5conf *conf, sector_t sector, |
953 | struct bio_list *bios) | |
765d704d | 954 | { |
aaf9f12e SL |
955 | struct bio_list tmp = BIO_EMPTY_LIST; |
956 | struct r5pending_data *ent; | |
957 | ||
765d704d | 958 | spin_lock(&conf->pending_bios_lock); |
aaf9f12e SL |
959 | ent = list_first_entry(&conf->free_list, struct r5pending_data, |
960 | sibling); | |
961 | list_move_tail(&ent->sibling, &conf->pending_list); | |
962 | ent->sector = sector; | |
963 | bio_list_init(&ent->bios); | |
964 | bio_list_merge(&ent->bios, bios); | |
965 | conf->pending_data_cnt++; | |
966 | if (conf->pending_data_cnt >= PENDING_IO_MAX) | |
967 | dispatch_defer_bios(conf, PENDING_IO_ONE_FLUSH, &tmp); | |
968 | ||
765d704d | 969 | spin_unlock(&conf->pending_bios_lock); |
aaf9f12e SL |
970 | |
971 | dispatch_bio_list(&tmp); | |
765d704d SL |
972 | } |
973 | ||
6712ecf8 | 974 | static void |
4246a0b6 | 975 | raid5_end_read_request(struct bio *bi); |
6712ecf8 | 976 | static void |
4246a0b6 | 977 | raid5_end_write_request(struct bio *bi); |
91c00924 | 978 | |
c4e5ac0a | 979 | static void ops_run_io(struct stripe_head *sh, struct stripe_head_state *s) |
91c00924 | 980 | { |
d1688a6d | 981 | struct r5conf *conf = sh->raid_conf; |
91c00924 | 982 | int i, disks = sh->disks; |
59fc630b | 983 | struct stripe_head *head_sh = sh; |
aaf9f12e SL |
984 | struct bio_list pending_bios = BIO_EMPTY_LIST; |
985 | bool should_defer; | |
91c00924 DW |
986 | |
987 | might_sleep(); | |
988 | ||
ff875738 AP |
989 | if (log_stripe(sh, s) == 0) |
990 | return; | |
1e6d690b | 991 | |
aaf9f12e | 992 | should_defer = conf->batch_bio_dispatch && conf->group_cnt; |
1e6d690b | 993 | |
91c00924 | 994 | for (i = disks; i--; ) { |
796a5cf0 | 995 | int op, op_flags = 0; |
9a3e1101 | 996 | int replace_only = 0; |
977df362 N |
997 | struct bio *bi, *rbi; |
998 | struct md_rdev *rdev, *rrdev = NULL; | |
59fc630b | 999 | |
1000 | sh = head_sh; | |
e9c7469b | 1001 | if (test_and_clear_bit(R5_Wantwrite, &sh->dev[i].flags)) { |
796a5cf0 | 1002 | op = REQ_OP_WRITE; |
e9c7469b | 1003 | if (test_and_clear_bit(R5_WantFUA, &sh->dev[i].flags)) |
70fd7614 | 1004 | op_flags = REQ_FUA; |
9e444768 | 1005 | if (test_bit(R5_Discard, &sh->dev[i].flags)) |
796a5cf0 | 1006 | op = REQ_OP_DISCARD; |
e9c7469b | 1007 | } else if (test_and_clear_bit(R5_Wantread, &sh->dev[i].flags)) |
796a5cf0 | 1008 | op = REQ_OP_READ; |
9a3e1101 N |
1009 | else if (test_and_clear_bit(R5_WantReplace, |
1010 | &sh->dev[i].flags)) { | |
796a5cf0 | 1011 | op = REQ_OP_WRITE; |
9a3e1101 N |
1012 | replace_only = 1; |
1013 | } else | |
91c00924 | 1014 | continue; |
bc0934f0 | 1015 | if (test_and_clear_bit(R5_SyncIO, &sh->dev[i].flags)) |
796a5cf0 | 1016 | op_flags |= REQ_SYNC; |
91c00924 | 1017 | |
59fc630b | 1018 | again: |
91c00924 | 1019 | bi = &sh->dev[i].req; |
977df362 | 1020 | rbi = &sh->dev[i].rreq; /* For writing to replacement */ |
91c00924 | 1021 | |
91c00924 | 1022 | rcu_read_lock(); |
9a3e1101 | 1023 | rrdev = rcu_dereference(conf->disks[i].replacement); |
dd054fce N |
1024 | smp_mb(); /* Ensure that if rrdev is NULL, rdev won't be */ |
1025 | rdev = rcu_dereference(conf->disks[i].rdev); | |
1026 | if (!rdev) { | |
1027 | rdev = rrdev; | |
1028 | rrdev = NULL; | |
1029 | } | |
796a5cf0 | 1030 | if (op_is_write(op)) { |
9a3e1101 N |
1031 | if (replace_only) |
1032 | rdev = NULL; | |
dd054fce N |
1033 | if (rdev == rrdev) |
1034 | /* We raced and saw duplicates */ | |
1035 | rrdev = NULL; | |
9a3e1101 | 1036 | } else { |
59fc630b | 1037 | if (test_bit(R5_ReadRepl, &head_sh->dev[i].flags) && rrdev) |
9a3e1101 N |
1038 | rdev = rrdev; |
1039 | rrdev = NULL; | |
1040 | } | |
977df362 | 1041 | |
91c00924 DW |
1042 | if (rdev && test_bit(Faulty, &rdev->flags)) |
1043 | rdev = NULL; | |
1044 | if (rdev) | |
1045 | atomic_inc(&rdev->nr_pending); | |
977df362 N |
1046 | if (rrdev && test_bit(Faulty, &rrdev->flags)) |
1047 | rrdev = NULL; | |
1048 | if (rrdev) | |
1049 | atomic_inc(&rrdev->nr_pending); | |
91c00924 DW |
1050 | rcu_read_unlock(); |
1051 | ||
73e92e51 | 1052 | /* We have already checked bad blocks for reads. Now |
977df362 N |
1053 | * need to check for writes. We never accept write errors |
1054 | * on the replacement, so we don't to check rrdev. | |
73e92e51 | 1055 | */ |
796a5cf0 | 1056 | while (op_is_write(op) && rdev && |
73e92e51 N |
1057 | test_bit(WriteErrorSeen, &rdev->flags)) { |
1058 | sector_t first_bad; | |
1059 | int bad_sectors; | |
1060 | int bad = is_badblock(rdev, sh->sector, STRIPE_SECTORS, | |
1061 | &first_bad, &bad_sectors); | |
1062 | if (!bad) | |
1063 | break; | |
1064 | ||
1065 | if (bad < 0) { | |
1066 | set_bit(BlockedBadBlocks, &rdev->flags); | |
1067 | if (!conf->mddev->external && | |
2953079c | 1068 | conf->mddev->sb_flags) { |
73e92e51 N |
1069 | /* It is very unlikely, but we might |
1070 | * still need to write out the | |
1071 | * bad block log - better give it | |
1072 | * a chance*/ | |
1073 | md_check_recovery(conf->mddev); | |
1074 | } | |
1850753d | 1075 | /* |
1076 | * Because md_wait_for_blocked_rdev | |
1077 | * will dec nr_pending, we must | |
1078 | * increment it first. | |
1079 | */ | |
1080 | atomic_inc(&rdev->nr_pending); | |
73e92e51 N |
1081 | md_wait_for_blocked_rdev(rdev, conf->mddev); |
1082 | } else { | |
1083 | /* Acknowledged bad block - skip the write */ | |
1084 | rdev_dec_pending(rdev, conf->mddev); | |
1085 | rdev = NULL; | |
1086 | } | |
1087 | } | |
1088 | ||
91c00924 | 1089 | if (rdev) { |
9a3e1101 N |
1090 | if (s->syncing || s->expanding || s->expanded |
1091 | || s->replacing) | |
91c00924 DW |
1092 | md_sync_acct(rdev->bdev, STRIPE_SECTORS); |
1093 | ||
2b7497f0 DW |
1094 | set_bit(STRIPE_IO_STARTED, &sh->state); |
1095 | ||
74d46992 | 1096 | bio_set_dev(bi, rdev->bdev); |
796a5cf0 MC |
1097 | bio_set_op_attrs(bi, op, op_flags); |
1098 | bi->bi_end_io = op_is_write(op) | |
2f6db2a7 KO |
1099 | ? raid5_end_write_request |
1100 | : raid5_end_read_request; | |
1101 | bi->bi_private = sh; | |
1102 | ||
6296b960 | 1103 | pr_debug("%s: for %llu schedule op %d on disc %d\n", |
e46b272b | 1104 | __func__, (unsigned long long)sh->sector, |
1eff9d32 | 1105 | bi->bi_opf, i); |
91c00924 | 1106 | atomic_inc(&sh->count); |
59fc630b | 1107 | if (sh != head_sh) |
1108 | atomic_inc(&head_sh->count); | |
05616be5 | 1109 | if (use_new_offset(conf, sh)) |
4f024f37 | 1110 | bi->bi_iter.bi_sector = (sh->sector |
05616be5 N |
1111 | + rdev->new_data_offset); |
1112 | else | |
4f024f37 | 1113 | bi->bi_iter.bi_sector = (sh->sector |
05616be5 | 1114 | + rdev->data_offset); |
59fc630b | 1115 | if (test_bit(R5_ReadNoMerge, &head_sh->dev[i].flags)) |
1eff9d32 | 1116 | bi->bi_opf |= REQ_NOMERGE; |
3f9e7c14 | 1117 | |
d592a996 SL |
1118 | if (test_bit(R5_SkipCopy, &sh->dev[i].flags)) |
1119 | WARN_ON(test_bit(R5_UPTODATE, &sh->dev[i].flags)); | |
86aa1397 SL |
1120 | |
1121 | if (!op_is_write(op) && | |
1122 | test_bit(R5_InJournal, &sh->dev[i].flags)) | |
1123 | /* | |
1124 | * issuing read for a page in journal, this | |
1125 | * must be preparing for prexor in rmw; read | |
1126 | * the data into orig_page | |
1127 | */ | |
1128 | sh->dev[i].vec.bv_page = sh->dev[i].orig_page; | |
1129 | else | |
1130 | sh->dev[i].vec.bv_page = sh->dev[i].page; | |
4997b72e | 1131 | bi->bi_vcnt = 1; |
91c00924 DW |
1132 | bi->bi_io_vec[0].bv_len = STRIPE_SIZE; |
1133 | bi->bi_io_vec[0].bv_offset = 0; | |
4f024f37 | 1134 | bi->bi_iter.bi_size = STRIPE_SIZE; |
2cd259a7 MD |
1135 | bi->bi_write_hint = sh->dev[i].write_hint; |
1136 | if (!rrdev) | |
f1934892 | 1137 | sh->dev[i].write_hint = RWH_WRITE_LIFE_NOT_SET; |
37c61ff3 SL |
1138 | /* |
1139 | * If this is discard request, set bi_vcnt 0. We don't | |
1140 | * want to confuse SCSI because SCSI will replace payload | |
1141 | */ | |
796a5cf0 | 1142 | if (op == REQ_OP_DISCARD) |
37c61ff3 | 1143 | bi->bi_vcnt = 0; |
977df362 N |
1144 | if (rrdev) |
1145 | set_bit(R5_DOUBLE_LOCKED, &sh->dev[i].flags); | |
e3620a3a JB |
1146 | |
1147 | if (conf->mddev->gendisk) | |
74d46992 | 1148 | trace_block_bio_remap(bi->bi_disk->queue, |
e3620a3a JB |
1149 | bi, disk_devt(conf->mddev->gendisk), |
1150 | sh->dev[i].sector); | |
aaf9f12e SL |
1151 | if (should_defer && op_is_write(op)) |
1152 | bio_list_add(&pending_bios, bi); | |
1153 | else | |
1154 | generic_make_request(bi); | |
977df362 N |
1155 | } |
1156 | if (rrdev) { | |
9a3e1101 N |
1157 | if (s->syncing || s->expanding || s->expanded |
1158 | || s->replacing) | |
977df362 N |
1159 | md_sync_acct(rrdev->bdev, STRIPE_SECTORS); |
1160 | ||
1161 | set_bit(STRIPE_IO_STARTED, &sh->state); | |
1162 | ||
74d46992 | 1163 | bio_set_dev(rbi, rrdev->bdev); |
796a5cf0 MC |
1164 | bio_set_op_attrs(rbi, op, op_flags); |
1165 | BUG_ON(!op_is_write(op)); | |
2f6db2a7 KO |
1166 | rbi->bi_end_io = raid5_end_write_request; |
1167 | rbi->bi_private = sh; | |
1168 | ||
6296b960 | 1169 | pr_debug("%s: for %llu schedule op %d on " |
977df362 N |
1170 | "replacement disc %d\n", |
1171 | __func__, (unsigned long long)sh->sector, | |
1eff9d32 | 1172 | rbi->bi_opf, i); |
977df362 | 1173 | atomic_inc(&sh->count); |
59fc630b | 1174 | if (sh != head_sh) |
1175 | atomic_inc(&head_sh->count); | |
05616be5 | 1176 | if (use_new_offset(conf, sh)) |
4f024f37 | 1177 | rbi->bi_iter.bi_sector = (sh->sector |
05616be5 N |
1178 | + rrdev->new_data_offset); |
1179 | else | |
4f024f37 | 1180 | rbi->bi_iter.bi_sector = (sh->sector |
05616be5 | 1181 | + rrdev->data_offset); |
d592a996 SL |
1182 | if (test_bit(R5_SkipCopy, &sh->dev[i].flags)) |
1183 | WARN_ON(test_bit(R5_UPTODATE, &sh->dev[i].flags)); | |
1184 | sh->dev[i].rvec.bv_page = sh->dev[i].page; | |
4997b72e | 1185 | rbi->bi_vcnt = 1; |
977df362 N |
1186 | rbi->bi_io_vec[0].bv_len = STRIPE_SIZE; |
1187 | rbi->bi_io_vec[0].bv_offset = 0; | |
4f024f37 | 1188 | rbi->bi_iter.bi_size = STRIPE_SIZE; |
2cd259a7 | 1189 | rbi->bi_write_hint = sh->dev[i].write_hint; |
f1934892 | 1190 | sh->dev[i].write_hint = RWH_WRITE_LIFE_NOT_SET; |
37c61ff3 SL |
1191 | /* |
1192 | * If this is discard request, set bi_vcnt 0. We don't | |
1193 | * want to confuse SCSI because SCSI will replace payload | |
1194 | */ | |
796a5cf0 | 1195 | if (op == REQ_OP_DISCARD) |
37c61ff3 | 1196 | rbi->bi_vcnt = 0; |
e3620a3a | 1197 | if (conf->mddev->gendisk) |
74d46992 | 1198 | trace_block_bio_remap(rbi->bi_disk->queue, |
e3620a3a JB |
1199 | rbi, disk_devt(conf->mddev->gendisk), |
1200 | sh->dev[i].sector); | |
aaf9f12e SL |
1201 | if (should_defer && op_is_write(op)) |
1202 | bio_list_add(&pending_bios, rbi); | |
1203 | else | |
1204 | generic_make_request(rbi); | |
977df362 N |
1205 | } |
1206 | if (!rdev && !rrdev) { | |
796a5cf0 | 1207 | if (op_is_write(op)) |
91c00924 | 1208 | set_bit(STRIPE_DEGRADED, &sh->state); |
6296b960 | 1209 | pr_debug("skip op %d on disc %d for sector %llu\n", |
1eff9d32 | 1210 | bi->bi_opf, i, (unsigned long long)sh->sector); |
91c00924 DW |
1211 | clear_bit(R5_LOCKED, &sh->dev[i].flags); |
1212 | set_bit(STRIPE_HANDLE, &sh->state); | |
1213 | } | |
59fc630b | 1214 | |
1215 | if (!head_sh->batch_head) | |
1216 | continue; | |
1217 | sh = list_first_entry(&sh->batch_list, struct stripe_head, | |
1218 | batch_list); | |
1219 | if (sh != head_sh) | |
1220 | goto again; | |
91c00924 | 1221 | } |
aaf9f12e SL |
1222 | |
1223 | if (should_defer && !bio_list_empty(&pending_bios)) | |
1224 | defer_issue_bios(conf, head_sh->sector, &pending_bios); | |
91c00924 DW |
1225 | } |
1226 | ||
1227 | static struct dma_async_tx_descriptor * | |
d592a996 SL |
1228 | async_copy_data(int frombio, struct bio *bio, struct page **page, |
1229 | sector_t sector, struct dma_async_tx_descriptor *tx, | |
1e6d690b | 1230 | struct stripe_head *sh, int no_skipcopy) |
91c00924 | 1231 | { |
7988613b KO |
1232 | struct bio_vec bvl; |
1233 | struct bvec_iter iter; | |
91c00924 | 1234 | struct page *bio_page; |
91c00924 | 1235 | int page_offset; |
a08abd8c | 1236 | struct async_submit_ctl submit; |
0403e382 | 1237 | enum async_tx_flags flags = 0; |
91c00924 | 1238 | |
4f024f37 KO |
1239 | if (bio->bi_iter.bi_sector >= sector) |
1240 | page_offset = (signed)(bio->bi_iter.bi_sector - sector) * 512; | |
91c00924 | 1241 | else |
4f024f37 | 1242 | page_offset = (signed)(sector - bio->bi_iter.bi_sector) * -512; |
a08abd8c | 1243 | |
0403e382 DW |
1244 | if (frombio) |
1245 | flags |= ASYNC_TX_FENCE; | |
1246 | init_async_submit(&submit, flags, tx, NULL, NULL, NULL); | |
1247 | ||
7988613b KO |
1248 | bio_for_each_segment(bvl, bio, iter) { |
1249 | int len = bvl.bv_len; | |
91c00924 DW |
1250 | int clen; |
1251 | int b_offset = 0; | |
1252 | ||
1253 | if (page_offset < 0) { | |
1254 | b_offset = -page_offset; | |
1255 | page_offset += b_offset; | |
1256 | len -= b_offset; | |
1257 | } | |
1258 | ||
1259 | if (len > 0 && page_offset + len > STRIPE_SIZE) | |
1260 | clen = STRIPE_SIZE - page_offset; | |
1261 | else | |
1262 | clen = len; | |
1263 | ||
1264 | if (clen > 0) { | |
7988613b KO |
1265 | b_offset += bvl.bv_offset; |
1266 | bio_page = bvl.bv_page; | |
d592a996 SL |
1267 | if (frombio) { |
1268 | if (sh->raid_conf->skip_copy && | |
1269 | b_offset == 0 && page_offset == 0 && | |
1e6d690b SL |
1270 | clen == STRIPE_SIZE && |
1271 | !no_skipcopy) | |
d592a996 SL |
1272 | *page = bio_page; |
1273 | else | |
1274 | tx = async_memcpy(*page, bio_page, page_offset, | |
a08abd8c | 1275 | b_offset, clen, &submit); |
d592a996 SL |
1276 | } else |
1277 | tx = async_memcpy(bio_page, *page, b_offset, | |
a08abd8c | 1278 | page_offset, clen, &submit); |
91c00924 | 1279 | } |
a08abd8c DW |
1280 | /* chain the operations */ |
1281 | submit.depend_tx = tx; | |
1282 | ||
91c00924 DW |
1283 | if (clen < len) /* hit end of page */ |
1284 | break; | |
1285 | page_offset += len; | |
1286 | } | |
1287 | ||
1288 | return tx; | |
1289 | } | |
1290 | ||
1291 | static void ops_complete_biofill(void *stripe_head_ref) | |
1292 | { | |
1293 | struct stripe_head *sh = stripe_head_ref; | |
e4d84909 | 1294 | int i; |
91c00924 | 1295 | |
e46b272b | 1296 | pr_debug("%s: stripe %llu\n", __func__, |
91c00924 DW |
1297 | (unsigned long long)sh->sector); |
1298 | ||
1299 | /* clear completed biofills */ | |
1300 | for (i = sh->disks; i--; ) { | |
1301 | struct r5dev *dev = &sh->dev[i]; | |
91c00924 DW |
1302 | |
1303 | /* acknowledge completion of a biofill operation */ | |
e4d84909 DW |
1304 | /* and check if we need to reply to a read request, |
1305 | * new R5_Wantfill requests are held off until | |
83de75cc | 1306 | * !STRIPE_BIOFILL_RUN |
e4d84909 DW |
1307 | */ |
1308 | if (test_and_clear_bit(R5_Wantfill, &dev->flags)) { | |
91c00924 | 1309 | struct bio *rbi, *rbi2; |
91c00924 | 1310 | |
91c00924 DW |
1311 | BUG_ON(!dev->read); |
1312 | rbi = dev->read; | |
1313 | dev->read = NULL; | |
4f024f37 | 1314 | while (rbi && rbi->bi_iter.bi_sector < |
91c00924 DW |
1315 | dev->sector + STRIPE_SECTORS) { |
1316 | rbi2 = r5_next_bio(rbi, dev->sector); | |
016c76ac | 1317 | bio_endio(rbi); |
91c00924 DW |
1318 | rbi = rbi2; |
1319 | } | |
1320 | } | |
1321 | } | |
83de75cc | 1322 | clear_bit(STRIPE_BIOFILL_RUN, &sh->state); |
91c00924 | 1323 | |
e4d84909 | 1324 | set_bit(STRIPE_HANDLE, &sh->state); |
6d036f7d | 1325 | raid5_release_stripe(sh); |
91c00924 DW |
1326 | } |
1327 | ||
1328 | static void ops_run_biofill(struct stripe_head *sh) | |
1329 | { | |
1330 | struct dma_async_tx_descriptor *tx = NULL; | |
a08abd8c | 1331 | struct async_submit_ctl submit; |
91c00924 DW |
1332 | int i; |
1333 | ||
59fc630b | 1334 | BUG_ON(sh->batch_head); |
e46b272b | 1335 | pr_debug("%s: stripe %llu\n", __func__, |
91c00924 DW |
1336 | (unsigned long long)sh->sector); |
1337 | ||
1338 | for (i = sh->disks; i--; ) { | |
1339 | struct r5dev *dev = &sh->dev[i]; | |
1340 | if (test_bit(R5_Wantfill, &dev->flags)) { | |
1341 | struct bio *rbi; | |
b17459c0 | 1342 | spin_lock_irq(&sh->stripe_lock); |
91c00924 DW |
1343 | dev->read = rbi = dev->toread; |
1344 | dev->toread = NULL; | |
b17459c0 | 1345 | spin_unlock_irq(&sh->stripe_lock); |
4f024f37 | 1346 | while (rbi && rbi->bi_iter.bi_sector < |
91c00924 | 1347 | dev->sector + STRIPE_SECTORS) { |
d592a996 | 1348 | tx = async_copy_data(0, rbi, &dev->page, |
1e6d690b | 1349 | dev->sector, tx, sh, 0); |
91c00924 DW |
1350 | rbi = r5_next_bio(rbi, dev->sector); |
1351 | } | |
1352 | } | |
1353 | } | |
1354 | ||
1355 | atomic_inc(&sh->count); | |
a08abd8c DW |
1356 | init_async_submit(&submit, ASYNC_TX_ACK, tx, ops_complete_biofill, sh, NULL); |
1357 | async_trigger_callback(&submit); | |
91c00924 DW |
1358 | } |
1359 | ||
4e7d2c0a | 1360 | static void mark_target_uptodate(struct stripe_head *sh, int target) |
91c00924 | 1361 | { |
4e7d2c0a | 1362 | struct r5dev *tgt; |
91c00924 | 1363 | |
4e7d2c0a DW |
1364 | if (target < 0) |
1365 | return; | |
91c00924 | 1366 | |
4e7d2c0a | 1367 | tgt = &sh->dev[target]; |
91c00924 DW |
1368 | set_bit(R5_UPTODATE, &tgt->flags); |
1369 | BUG_ON(!test_bit(R5_Wantcompute, &tgt->flags)); | |
1370 | clear_bit(R5_Wantcompute, &tgt->flags); | |
4e7d2c0a DW |
1371 | } |
1372 | ||
ac6b53b6 | 1373 | static void ops_complete_compute(void *stripe_head_ref) |
91c00924 DW |
1374 | { |
1375 | struct stripe_head *sh = stripe_head_ref; | |
91c00924 | 1376 | |
e46b272b | 1377 | pr_debug("%s: stripe %llu\n", __func__, |
91c00924 DW |
1378 | (unsigned long long)sh->sector); |
1379 | ||
ac6b53b6 | 1380 | /* mark the computed target(s) as uptodate */ |
4e7d2c0a | 1381 | mark_target_uptodate(sh, sh->ops.target); |
ac6b53b6 | 1382 | mark_target_uptodate(sh, sh->ops.target2); |
4e7d2c0a | 1383 | |
ecc65c9b DW |
1384 | clear_bit(STRIPE_COMPUTE_RUN, &sh->state); |
1385 | if (sh->check_state == check_state_compute_run) | |
1386 | sh->check_state = check_state_compute_result; | |
91c00924 | 1387 | set_bit(STRIPE_HANDLE, &sh->state); |
6d036f7d | 1388 | raid5_release_stripe(sh); |
91c00924 DW |
1389 | } |
1390 | ||
d6f38f31 | 1391 | /* return a pointer to the address conversion region of the scribble buffer */ |
b330e6a4 | 1392 | static struct page **to_addr_page(struct raid5_percpu *percpu, int i) |
d6f38f31 | 1393 | { |
b330e6a4 | 1394 | return percpu->scribble + i * percpu->scribble_obj_size; |
46d5b785 | 1395 | } |
1396 | ||
1397 | /* return a pointer to the address conversion region of the scribble buffer */ | |
b330e6a4 KO |
1398 | static addr_conv_t *to_addr_conv(struct stripe_head *sh, |
1399 | struct raid5_percpu *percpu, int i) | |
46d5b785 | 1400 | { |
b330e6a4 | 1401 | return (void *) (to_addr_page(percpu, i) + sh->disks + 2); |
d6f38f31 DW |
1402 | } |
1403 | ||
1404 | static struct dma_async_tx_descriptor * | |
1405 | ops_run_compute5(struct stripe_head *sh, struct raid5_percpu *percpu) | |
91c00924 | 1406 | { |
91c00924 | 1407 | int disks = sh->disks; |
46d5b785 | 1408 | struct page **xor_srcs = to_addr_page(percpu, 0); |
91c00924 DW |
1409 | int target = sh->ops.target; |
1410 | struct r5dev *tgt = &sh->dev[target]; | |
1411 | struct page *xor_dest = tgt->page; | |
1412 | int count = 0; | |
1413 | struct dma_async_tx_descriptor *tx; | |
a08abd8c | 1414 | struct async_submit_ctl submit; |
91c00924 DW |
1415 | int i; |
1416 | ||
59fc630b | 1417 | BUG_ON(sh->batch_head); |
1418 | ||
91c00924 | 1419 | pr_debug("%s: stripe %llu block: %d\n", |
e46b272b | 1420 | __func__, (unsigned long long)sh->sector, target); |
91c00924 DW |
1421 | BUG_ON(!test_bit(R5_Wantcompute, &tgt->flags)); |
1422 | ||
1423 | for (i = disks; i--; ) | |
1424 | if (i != target) | |
1425 | xor_srcs[count++] = sh->dev[i].page; | |
1426 | ||
1427 | atomic_inc(&sh->count); | |
1428 | ||
0403e382 | 1429 | init_async_submit(&submit, ASYNC_TX_FENCE|ASYNC_TX_XOR_ZERO_DST, NULL, |
46d5b785 | 1430 | ops_complete_compute, sh, to_addr_conv(sh, percpu, 0)); |
91c00924 | 1431 | if (unlikely(count == 1)) |
a08abd8c | 1432 | tx = async_memcpy(xor_dest, xor_srcs[0], 0, 0, STRIPE_SIZE, &submit); |
91c00924 | 1433 | else |
a08abd8c | 1434 | tx = async_xor(xor_dest, xor_srcs, 0, count, STRIPE_SIZE, &submit); |
91c00924 | 1435 | |
91c00924 DW |
1436 | return tx; |
1437 | } | |
1438 | ||
ac6b53b6 DW |
1439 | /* set_syndrome_sources - populate source buffers for gen_syndrome |
1440 | * @srcs - (struct page *) array of size sh->disks | |
1441 | * @sh - stripe_head to parse | |
1442 | * | |
1443 | * Populates srcs in proper layout order for the stripe and returns the | |
1444 | * 'count' of sources to be used in a call to async_gen_syndrome. The P | |
1445 | * destination buffer is recorded in srcs[count] and the Q destination | |
1446 | * is recorded in srcs[count+1]]. | |
1447 | */ | |
584acdd4 MS |
1448 | static int set_syndrome_sources(struct page **srcs, |
1449 | struct stripe_head *sh, | |
1450 | int srctype) | |
ac6b53b6 DW |
1451 | { |
1452 | int disks = sh->disks; | |
1453 | int syndrome_disks = sh->ddf_layout ? disks : (disks - 2); | |
1454 | int d0_idx = raid6_d0(sh); | |
1455 | int count; | |
1456 | int i; | |
1457 | ||
1458 | for (i = 0; i < disks; i++) | |
5dd33c9a | 1459 | srcs[i] = NULL; |
ac6b53b6 DW |
1460 | |
1461 | count = 0; | |
1462 | i = d0_idx; | |
1463 | do { | |
1464 | int slot = raid6_idx_to_slot(i, sh, &count, syndrome_disks); | |
584acdd4 | 1465 | struct r5dev *dev = &sh->dev[i]; |
ac6b53b6 | 1466 | |
584acdd4 MS |
1467 | if (i == sh->qd_idx || i == sh->pd_idx || |
1468 | (srctype == SYNDROME_SRC_ALL) || | |
1469 | (srctype == SYNDROME_SRC_WANT_DRAIN && | |
1e6d690b SL |
1470 | (test_bit(R5_Wantdrain, &dev->flags) || |
1471 | test_bit(R5_InJournal, &dev->flags))) || | |
584acdd4 | 1472 | (srctype == SYNDROME_SRC_WRITTEN && |
0977762f SL |
1473 | (dev->written || |
1474 | test_bit(R5_InJournal, &dev->flags)))) { | |
1e6d690b SL |
1475 | if (test_bit(R5_InJournal, &dev->flags)) |
1476 | srcs[slot] = sh->dev[i].orig_page; | |
1477 | else | |
1478 | srcs[slot] = sh->dev[i].page; | |
1479 | } | |
ac6b53b6 DW |
1480 | i = raid6_next_disk(i, disks); |
1481 | } while (i != d0_idx); | |
ac6b53b6 | 1482 | |
e4424fee | 1483 | return syndrome_disks; |
ac6b53b6 DW |
1484 | } |
1485 | ||
1486 | static struct dma_async_tx_descriptor * | |
1487 | ops_run_compute6_1(struct stripe_head *sh, struct raid5_percpu *percpu) | |
1488 | { | |
1489 | int disks = sh->disks; | |
46d5b785 | 1490 | struct page **blocks = to_addr_page(percpu, 0); |
ac6b53b6 DW |
1491 | int target; |
1492 | int qd_idx = sh->qd_idx; | |
1493 | struct dma_async_tx_descriptor *tx; | |
1494 | struct async_submit_ctl submit; | |
1495 | struct r5dev *tgt; | |
1496 | struct page *dest; | |
1497 | int i; | |
1498 | int count; | |
1499 | ||
59fc630b | 1500 | BUG_ON(sh->batch_head); |
ac6b53b6 DW |
1501 | if (sh->ops.target < 0) |
1502 | target = sh->ops.target2; | |
1503 | else if (sh->ops.target2 < 0) | |
1504 | target = sh->ops.target; | |
91c00924 | 1505 | else |
ac6b53b6 DW |
1506 | /* we should only have one valid target */ |
1507 | BUG(); | |
1508 | BUG_ON(target < 0); | |
1509 | pr_debug("%s: stripe %llu block: %d\n", | |
1510 | __func__, (unsigned long long)sh->sector, target); | |
1511 | ||
1512 | tgt = &sh->dev[target]; | |
1513 | BUG_ON(!test_bit(R5_Wantcompute, &tgt->flags)); | |
1514 | dest = tgt->page; | |
1515 | ||
1516 | atomic_inc(&sh->count); | |
1517 | ||
1518 | if (target == qd_idx) { | |
584acdd4 | 1519 | count = set_syndrome_sources(blocks, sh, SYNDROME_SRC_ALL); |
ac6b53b6 DW |
1520 | blocks[count] = NULL; /* regenerating p is not necessary */ |
1521 | BUG_ON(blocks[count+1] != dest); /* q should already be set */ | |
0403e382 DW |
1522 | init_async_submit(&submit, ASYNC_TX_FENCE, NULL, |
1523 | ops_complete_compute, sh, | |
46d5b785 | 1524 | to_addr_conv(sh, percpu, 0)); |
ac6b53b6 DW |
1525 | tx = async_gen_syndrome(blocks, 0, count+2, STRIPE_SIZE, &submit); |
1526 | } else { | |
1527 | /* Compute any data- or p-drive using XOR */ | |
1528 | count = 0; | |
1529 | for (i = disks; i-- ; ) { | |
1530 | if (i == target || i == qd_idx) | |
1531 | continue; | |
1532 | blocks[count++] = sh->dev[i].page; | |
1533 | } | |
1534 | ||
0403e382 DW |
1535 | init_async_submit(&submit, ASYNC_TX_FENCE|ASYNC_TX_XOR_ZERO_DST, |
1536 | NULL, ops_complete_compute, sh, | |
46d5b785 | 1537 | to_addr_conv(sh, percpu, 0)); |
ac6b53b6 DW |
1538 | tx = async_xor(dest, blocks, 0, count, STRIPE_SIZE, &submit); |
1539 | } | |
91c00924 | 1540 | |
91c00924 DW |
1541 | return tx; |
1542 | } | |
1543 | ||
ac6b53b6 DW |
1544 | static struct dma_async_tx_descriptor * |
1545 | ops_run_compute6_2(struct stripe_head *sh, struct raid5_percpu *percpu) | |
1546 | { | |
1547 | int i, count, disks = sh->disks; | |
1548 | int syndrome_disks = sh->ddf_layout ? disks : disks-2; | |
1549 | int d0_idx = raid6_d0(sh); | |
1550 | int faila = -1, failb = -1; | |
1551 | int target = sh->ops.target; | |
1552 | int target2 = sh->ops.target2; | |
1553 | struct r5dev *tgt = &sh->dev[target]; | |
1554 | struct r5dev *tgt2 = &sh->dev[target2]; | |
1555 | struct dma_async_tx_descriptor *tx; | |
46d5b785 | 1556 | struct page **blocks = to_addr_page(percpu, 0); |
ac6b53b6 DW |
1557 | struct async_submit_ctl submit; |
1558 | ||
59fc630b | 1559 | BUG_ON(sh->batch_head); |
ac6b53b6 DW |
1560 | pr_debug("%s: stripe %llu block1: %d block2: %d\n", |
1561 | __func__, (unsigned long long)sh->sector, target, target2); | |
1562 | BUG_ON(target < 0 || target2 < 0); | |
1563 | BUG_ON(!test_bit(R5_Wantcompute, &tgt->flags)); | |
1564 | BUG_ON(!test_bit(R5_Wantcompute, &tgt2->flags)); | |
1565 | ||
6c910a78 | 1566 | /* we need to open-code set_syndrome_sources to handle the |
ac6b53b6 DW |
1567 | * slot number conversion for 'faila' and 'failb' |
1568 | */ | |
1569 | for (i = 0; i < disks ; i++) | |
5dd33c9a | 1570 | blocks[i] = NULL; |
ac6b53b6 DW |
1571 | count = 0; |
1572 | i = d0_idx; | |
1573 | do { | |
1574 | int slot = raid6_idx_to_slot(i, sh, &count, syndrome_disks); | |
1575 | ||
1576 | blocks[slot] = sh->dev[i].page; | |
1577 | ||
1578 | if (i == target) | |
1579 | faila = slot; | |
1580 | if (i == target2) | |
1581 | failb = slot; | |
1582 | i = raid6_next_disk(i, disks); | |
1583 | } while (i != d0_idx); | |
ac6b53b6 DW |
1584 | |
1585 | BUG_ON(faila == failb); | |
1586 | if (failb < faila) | |
1587 | swap(faila, failb); | |
1588 | pr_debug("%s: stripe: %llu faila: %d failb: %d\n", | |
1589 | __func__, (unsigned long long)sh->sector, faila, failb); | |
1590 | ||
1591 | atomic_inc(&sh->count); | |
1592 | ||
1593 | if (failb == syndrome_disks+1) { | |
1594 | /* Q disk is one of the missing disks */ | |
1595 | if (faila == syndrome_disks) { | |
1596 | /* Missing P+Q, just recompute */ | |
0403e382 DW |
1597 | init_async_submit(&submit, ASYNC_TX_FENCE, NULL, |
1598 | ops_complete_compute, sh, | |
46d5b785 | 1599 | to_addr_conv(sh, percpu, 0)); |
e4424fee | 1600 | return async_gen_syndrome(blocks, 0, syndrome_disks+2, |
ac6b53b6 DW |
1601 | STRIPE_SIZE, &submit); |
1602 | } else { | |
1603 | struct page *dest; | |
1604 | int data_target; | |
1605 | int qd_idx = sh->qd_idx; | |
1606 | ||
1607 | /* Missing D+Q: recompute D from P, then recompute Q */ | |
1608 | if (target == qd_idx) | |
1609 | data_target = target2; | |
1610 | else | |
1611 | data_target = target; | |
1612 | ||
1613 | count = 0; | |
1614 | for (i = disks; i-- ; ) { | |
1615 | if (i == data_target || i == qd_idx) | |
1616 | continue; | |
1617 | blocks[count++] = sh->dev[i].page; | |
1618 | } | |
1619 | dest = sh->dev[data_target].page; | |
0403e382 DW |
1620 | init_async_submit(&submit, |
1621 | ASYNC_TX_FENCE|ASYNC_TX_XOR_ZERO_DST, | |
1622 | NULL, NULL, NULL, | |
46d5b785 | 1623 | to_addr_conv(sh, percpu, 0)); |
ac6b53b6 DW |
1624 | tx = async_xor(dest, blocks, 0, count, STRIPE_SIZE, |
1625 | &submit); | |
1626 | ||
584acdd4 | 1627 | count = set_syndrome_sources(blocks, sh, SYNDROME_SRC_ALL); |
0403e382 DW |
1628 | init_async_submit(&submit, ASYNC_TX_FENCE, tx, |
1629 | ops_complete_compute, sh, | |
46d5b785 | 1630 | to_addr_conv(sh, percpu, 0)); |
ac6b53b6 DW |
1631 | return async_gen_syndrome(blocks, 0, count+2, |
1632 | STRIPE_SIZE, &submit); | |
1633 | } | |
ac6b53b6 | 1634 | } else { |
6c910a78 DW |
1635 | init_async_submit(&submit, ASYNC_TX_FENCE, NULL, |
1636 | ops_complete_compute, sh, | |
46d5b785 | 1637 | to_addr_conv(sh, percpu, 0)); |
6c910a78 DW |
1638 | if (failb == syndrome_disks) { |
1639 | /* We're missing D+P. */ | |
1640 | return async_raid6_datap_recov(syndrome_disks+2, | |
1641 | STRIPE_SIZE, faila, | |
1642 | blocks, &submit); | |
1643 | } else { | |
1644 | /* We're missing D+D. */ | |
1645 | return async_raid6_2data_recov(syndrome_disks+2, | |
1646 | STRIPE_SIZE, faila, failb, | |
1647 | blocks, &submit); | |
1648 | } | |
ac6b53b6 DW |
1649 | } |
1650 | } | |
1651 | ||
91c00924 DW |
1652 | static void ops_complete_prexor(void *stripe_head_ref) |
1653 | { | |
1654 | struct stripe_head *sh = stripe_head_ref; | |
1655 | ||
e46b272b | 1656 | pr_debug("%s: stripe %llu\n", __func__, |
91c00924 | 1657 | (unsigned long long)sh->sector); |
1e6d690b SL |
1658 | |
1659 | if (r5c_is_writeback(sh->raid_conf->log)) | |
1660 | /* | |
1661 | * raid5-cache write back uses orig_page during prexor. | |
1662 | * After prexor, it is time to free orig_page | |
1663 | */ | |
1664 | r5c_release_extra_page(sh); | |
91c00924 DW |
1665 | } |
1666 | ||
1667 | static struct dma_async_tx_descriptor * | |
584acdd4 MS |
1668 | ops_run_prexor5(struct stripe_head *sh, struct raid5_percpu *percpu, |
1669 | struct dma_async_tx_descriptor *tx) | |
91c00924 | 1670 | { |
91c00924 | 1671 | int disks = sh->disks; |
46d5b785 | 1672 | struct page **xor_srcs = to_addr_page(percpu, 0); |
91c00924 | 1673 | int count = 0, pd_idx = sh->pd_idx, i; |
a08abd8c | 1674 | struct async_submit_ctl submit; |
91c00924 DW |
1675 | |
1676 | /* existing parity data subtracted */ | |
1677 | struct page *xor_dest = xor_srcs[count++] = sh->dev[pd_idx].page; | |
1678 | ||
59fc630b | 1679 | BUG_ON(sh->batch_head); |
e46b272b | 1680 | pr_debug("%s: stripe %llu\n", __func__, |
91c00924 DW |
1681 | (unsigned long long)sh->sector); |
1682 | ||
1683 | for (i = disks; i--; ) { | |
1684 | struct r5dev *dev = &sh->dev[i]; | |
1685 | /* Only process blocks that are known to be uptodate */ | |
1e6d690b SL |
1686 | if (test_bit(R5_InJournal, &dev->flags)) |
1687 | xor_srcs[count++] = dev->orig_page; | |
1688 | else if (test_bit(R5_Wantdrain, &dev->flags)) | |
91c00924 DW |
1689 | xor_srcs[count++] = dev->page; |
1690 | } | |
1691 | ||
0403e382 | 1692 | init_async_submit(&submit, ASYNC_TX_FENCE|ASYNC_TX_XOR_DROP_DST, tx, |
46d5b785 | 1693 | ops_complete_prexor, sh, to_addr_conv(sh, percpu, 0)); |
a08abd8c | 1694 | tx = async_xor(xor_dest, xor_srcs, 0, count, STRIPE_SIZE, &submit); |
91c00924 DW |
1695 | |
1696 | return tx; | |
1697 | } | |
1698 | ||
584acdd4 MS |
1699 | static struct dma_async_tx_descriptor * |
1700 | ops_run_prexor6(struct stripe_head *sh, struct raid5_percpu *percpu, | |
1701 | struct dma_async_tx_descriptor *tx) | |
1702 | { | |
1703 | struct page **blocks = to_addr_page(percpu, 0); | |
1704 | int count; | |
1705 | struct async_submit_ctl submit; | |
1706 | ||
1707 | pr_debug("%s: stripe %llu\n", __func__, | |
1708 | (unsigned long long)sh->sector); | |
1709 | ||
1710 | count = set_syndrome_sources(blocks, sh, SYNDROME_SRC_WANT_DRAIN); | |
1711 | ||
1712 | init_async_submit(&submit, ASYNC_TX_FENCE|ASYNC_TX_PQ_XOR_DST, tx, | |
1713 | ops_complete_prexor, sh, to_addr_conv(sh, percpu, 0)); | |
1714 | tx = async_gen_syndrome(blocks, 0, count+2, STRIPE_SIZE, &submit); | |
1715 | ||
1716 | return tx; | |
1717 | } | |
1718 | ||
91c00924 | 1719 | static struct dma_async_tx_descriptor * |
d8ee0728 | 1720 | ops_run_biodrain(struct stripe_head *sh, struct dma_async_tx_descriptor *tx) |
91c00924 | 1721 | { |
1e6d690b | 1722 | struct r5conf *conf = sh->raid_conf; |
91c00924 | 1723 | int disks = sh->disks; |
d8ee0728 | 1724 | int i; |
59fc630b | 1725 | struct stripe_head *head_sh = sh; |
91c00924 | 1726 | |
e46b272b | 1727 | pr_debug("%s: stripe %llu\n", __func__, |
91c00924 DW |
1728 | (unsigned long long)sh->sector); |
1729 | ||
1730 | for (i = disks; i--; ) { | |
59fc630b | 1731 | struct r5dev *dev; |
91c00924 | 1732 | struct bio *chosen; |
91c00924 | 1733 | |
59fc630b | 1734 | sh = head_sh; |
1735 | if (test_and_clear_bit(R5_Wantdrain, &head_sh->dev[i].flags)) { | |
91c00924 DW |
1736 | struct bio *wbi; |
1737 | ||
59fc630b | 1738 | again: |
1739 | dev = &sh->dev[i]; | |
1e6d690b SL |
1740 | /* |
1741 | * clear R5_InJournal, so when rewriting a page in | |
1742 | * journal, it is not skipped by r5l_log_stripe() | |
1743 | */ | |
1744 | clear_bit(R5_InJournal, &dev->flags); | |
b17459c0 | 1745 | spin_lock_irq(&sh->stripe_lock); |
91c00924 DW |
1746 | chosen = dev->towrite; |
1747 | dev->towrite = NULL; | |
7a87f434 | 1748 | sh->overwrite_disks = 0; |
91c00924 DW |
1749 | BUG_ON(dev->written); |
1750 | wbi = dev->written = chosen; | |
b17459c0 | 1751 | spin_unlock_irq(&sh->stripe_lock); |
d592a996 | 1752 | WARN_ON(dev->page != dev->orig_page); |
91c00924 | 1753 | |
4f024f37 | 1754 | while (wbi && wbi->bi_iter.bi_sector < |
91c00924 | 1755 | dev->sector + STRIPE_SECTORS) { |
1eff9d32 | 1756 | if (wbi->bi_opf & REQ_FUA) |
e9c7469b | 1757 | set_bit(R5_WantFUA, &dev->flags); |
1eff9d32 | 1758 | if (wbi->bi_opf & REQ_SYNC) |
bc0934f0 | 1759 | set_bit(R5_SyncIO, &dev->flags); |
796a5cf0 | 1760 | if (bio_op(wbi) == REQ_OP_DISCARD) |
620125f2 | 1761 | set_bit(R5_Discard, &dev->flags); |
d592a996 SL |
1762 | else { |
1763 | tx = async_copy_data(1, wbi, &dev->page, | |
1e6d690b SL |
1764 | dev->sector, tx, sh, |
1765 | r5c_is_writeback(conf->log)); | |
1766 | if (dev->page != dev->orig_page && | |
1767 | !r5c_is_writeback(conf->log)) { | |
d592a996 SL |
1768 | set_bit(R5_SkipCopy, &dev->flags); |
1769 | clear_bit(R5_UPTODATE, &dev->flags); | |
1770 | clear_bit(R5_OVERWRITE, &dev->flags); | |
1771 | } | |
1772 | } | |
91c00924 DW |
1773 | wbi = r5_next_bio(wbi, dev->sector); |
1774 | } | |
59fc630b | 1775 | |
1776 | if (head_sh->batch_head) { | |
1777 | sh = list_first_entry(&sh->batch_list, | |
1778 | struct stripe_head, | |
1779 | batch_list); | |
1780 | if (sh == head_sh) | |
1781 | continue; | |
1782 | goto again; | |
1783 | } | |
91c00924 DW |
1784 | } |
1785 | } | |
1786 | ||
1787 | return tx; | |
1788 | } | |
1789 | ||
ac6b53b6 | 1790 | static void ops_complete_reconstruct(void *stripe_head_ref) |
91c00924 DW |
1791 | { |
1792 | struct stripe_head *sh = stripe_head_ref; | |
ac6b53b6 DW |
1793 | int disks = sh->disks; |
1794 | int pd_idx = sh->pd_idx; | |
1795 | int qd_idx = sh->qd_idx; | |
1796 | int i; | |
9e444768 | 1797 | bool fua = false, sync = false, discard = false; |
91c00924 | 1798 | |
e46b272b | 1799 | pr_debug("%s: stripe %llu\n", __func__, |
91c00924 DW |
1800 | (unsigned long long)sh->sector); |
1801 | ||
bc0934f0 | 1802 | for (i = disks; i--; ) { |
e9c7469b | 1803 | fua |= test_bit(R5_WantFUA, &sh->dev[i].flags); |
bc0934f0 | 1804 | sync |= test_bit(R5_SyncIO, &sh->dev[i].flags); |
9e444768 | 1805 | discard |= test_bit(R5_Discard, &sh->dev[i].flags); |
bc0934f0 | 1806 | } |
e9c7469b | 1807 | |
91c00924 DW |
1808 | for (i = disks; i--; ) { |
1809 | struct r5dev *dev = &sh->dev[i]; | |
ac6b53b6 | 1810 | |
e9c7469b | 1811 | if (dev->written || i == pd_idx || i == qd_idx) { |
235b6003 | 1812 | if (!discard && !test_bit(R5_SkipCopy, &dev->flags)) { |
9e444768 | 1813 | set_bit(R5_UPTODATE, &dev->flags); |
235b6003 N |
1814 | if (test_bit(STRIPE_EXPAND_READY, &sh->state)) |
1815 | set_bit(R5_Expanded, &dev->flags); | |
1816 | } | |
e9c7469b TH |
1817 | if (fua) |
1818 | set_bit(R5_WantFUA, &dev->flags); | |
bc0934f0 SL |
1819 | if (sync) |
1820 | set_bit(R5_SyncIO, &dev->flags); | |
e9c7469b | 1821 | } |
91c00924 DW |
1822 | } |
1823 | ||
d8ee0728 DW |
1824 | if (sh->reconstruct_state == reconstruct_state_drain_run) |
1825 | sh->reconstruct_state = reconstruct_state_drain_result; | |
1826 | else if (sh->reconstruct_state == reconstruct_state_prexor_drain_run) | |
1827 | sh->reconstruct_state = reconstruct_state_prexor_drain_result; | |
1828 | else { | |
1829 | BUG_ON(sh->reconstruct_state != reconstruct_state_run); | |
1830 | sh->reconstruct_state = reconstruct_state_result; | |
1831 | } | |
91c00924 DW |
1832 | |
1833 | set_bit(STRIPE_HANDLE, &sh->state); | |
6d036f7d | 1834 | raid5_release_stripe(sh); |
91c00924 DW |
1835 | } |
1836 | ||
1837 | static void | |
ac6b53b6 DW |
1838 | ops_run_reconstruct5(struct stripe_head *sh, struct raid5_percpu *percpu, |
1839 | struct dma_async_tx_descriptor *tx) | |
91c00924 | 1840 | { |
91c00924 | 1841 | int disks = sh->disks; |
59fc630b | 1842 | struct page **xor_srcs; |
a08abd8c | 1843 | struct async_submit_ctl submit; |
59fc630b | 1844 | int count, pd_idx = sh->pd_idx, i; |
91c00924 | 1845 | struct page *xor_dest; |
d8ee0728 | 1846 | int prexor = 0; |
91c00924 | 1847 | unsigned long flags; |
59fc630b | 1848 | int j = 0; |
1849 | struct stripe_head *head_sh = sh; | |
1850 | int last_stripe; | |
91c00924 | 1851 | |
e46b272b | 1852 | pr_debug("%s: stripe %llu\n", __func__, |
91c00924 DW |
1853 | (unsigned long long)sh->sector); |
1854 | ||
620125f2 SL |
1855 | for (i = 0; i < sh->disks; i++) { |
1856 | if (pd_idx == i) | |
1857 | continue; | |
1858 | if (!test_bit(R5_Discard, &sh->dev[i].flags)) | |
1859 | break; | |
1860 | } | |
1861 | if (i >= sh->disks) { | |
1862 | atomic_inc(&sh->count); | |
620125f2 SL |
1863 | set_bit(R5_Discard, &sh->dev[pd_idx].flags); |
1864 | ops_complete_reconstruct(sh); | |
1865 | return; | |
1866 | } | |
59fc630b | 1867 | again: |
1868 | count = 0; | |
1869 | xor_srcs = to_addr_page(percpu, j); | |
91c00924 DW |
1870 | /* check if prexor is active which means only process blocks |
1871 | * that are part of a read-modify-write (written) | |
1872 | */ | |
59fc630b | 1873 | if (head_sh->reconstruct_state == reconstruct_state_prexor_drain_run) { |
d8ee0728 | 1874 | prexor = 1; |
91c00924 DW |
1875 | xor_dest = xor_srcs[count++] = sh->dev[pd_idx].page; |
1876 | for (i = disks; i--; ) { | |
1877 | struct r5dev *dev = &sh->dev[i]; | |
1e6d690b SL |
1878 | if (head_sh->dev[i].written || |
1879 | test_bit(R5_InJournal, &head_sh->dev[i].flags)) | |
91c00924 DW |
1880 | xor_srcs[count++] = dev->page; |
1881 | } | |
1882 | } else { | |
1883 | xor_dest = sh->dev[pd_idx].page; | |
1884 | for (i = disks; i--; ) { | |
1885 | struct r5dev *dev = &sh->dev[i]; | |
1886 | if (i != pd_idx) | |
1887 | xor_srcs[count++] = dev->page; | |
1888 | } | |
1889 | } | |
1890 | ||
91c00924 DW |
1891 | /* 1/ if we prexor'd then the dest is reused as a source |
1892 | * 2/ if we did not prexor then we are redoing the parity | |
1893 | * set ASYNC_TX_XOR_DROP_DST and ASYNC_TX_XOR_ZERO_DST | |
1894 | * for the synchronous xor case | |
1895 | */ | |
59fc630b | 1896 | last_stripe = !head_sh->batch_head || |
1897 | list_first_entry(&sh->batch_list, | |
1898 | struct stripe_head, batch_list) == head_sh; | |
1899 | if (last_stripe) { | |
1900 | flags = ASYNC_TX_ACK | | |
1901 | (prexor ? ASYNC_TX_XOR_DROP_DST : ASYNC_TX_XOR_ZERO_DST); | |
1902 | ||
1903 | atomic_inc(&head_sh->count); | |
1904 | init_async_submit(&submit, flags, tx, ops_complete_reconstruct, head_sh, | |
1905 | to_addr_conv(sh, percpu, j)); | |
1906 | } else { | |
1907 | flags = prexor ? ASYNC_TX_XOR_DROP_DST : ASYNC_TX_XOR_ZERO_DST; | |
1908 | init_async_submit(&submit, flags, tx, NULL, NULL, | |
1909 | to_addr_conv(sh, percpu, j)); | |
1910 | } | |
91c00924 | 1911 | |
a08abd8c DW |
1912 | if (unlikely(count == 1)) |
1913 | tx = async_memcpy(xor_dest, xor_srcs[0], 0, 0, STRIPE_SIZE, &submit); | |
1914 | else | |
1915 | tx = async_xor(xor_dest, xor_srcs, 0, count, STRIPE_SIZE, &submit); | |
59fc630b | 1916 | if (!last_stripe) { |
1917 | j++; | |
1918 | sh = list_first_entry(&sh->batch_list, struct stripe_head, | |
1919 | batch_list); | |
1920 | goto again; | |
1921 | } | |
91c00924 DW |
1922 | } |
1923 | ||
ac6b53b6 DW |
1924 | static void |
1925 | ops_run_reconstruct6(struct stripe_head *sh, struct raid5_percpu *percpu, | |
1926 | struct dma_async_tx_descriptor *tx) | |
1927 | { | |
1928 | struct async_submit_ctl submit; | |
59fc630b | 1929 | struct page **blocks; |
1930 | int count, i, j = 0; | |
1931 | struct stripe_head *head_sh = sh; | |
1932 | int last_stripe; | |
584acdd4 MS |
1933 | int synflags; |
1934 | unsigned long txflags; | |
ac6b53b6 DW |
1935 | |
1936 | pr_debug("%s: stripe %llu\n", __func__, (unsigned long long)sh->sector); | |
1937 | ||
620125f2 SL |
1938 | for (i = 0; i < sh->disks; i++) { |
1939 | if (sh->pd_idx == i || sh->qd_idx == i) | |
1940 | continue; | |
1941 | if (!test_bit(R5_Discard, &sh->dev[i].flags)) | |
1942 | break; | |
1943 | } | |
1944 | if (i >= sh->disks) { | |
1945 | atomic_inc(&sh->count); | |
620125f2 SL |
1946 | set_bit(R5_Discard, &sh->dev[sh->pd_idx].flags); |
1947 | set_bit(R5_Discard, &sh->dev[sh->qd_idx].flags); | |
1948 | ops_complete_reconstruct(sh); | |
1949 | return; | |
1950 | } | |
1951 | ||
59fc630b | 1952 | again: |
1953 | blocks = to_addr_page(percpu, j); | |
584acdd4 MS |
1954 | |
1955 | if (sh->reconstruct_state == reconstruct_state_prexor_drain_run) { | |
1956 | synflags = SYNDROME_SRC_WRITTEN; | |
1957 | txflags = ASYNC_TX_ACK | ASYNC_TX_PQ_XOR_DST; | |
1958 | } else { | |
1959 | synflags = SYNDROME_SRC_ALL; | |
1960 | txflags = ASYNC_TX_ACK; | |
1961 | } | |
1962 | ||
1963 | count = set_syndrome_sources(blocks, sh, synflags); | |
59fc630b | 1964 | last_stripe = !head_sh->batch_head || |
1965 | list_first_entry(&sh->batch_list, | |
1966 | struct stripe_head, batch_list) == head_sh; | |
1967 | ||
1968 | if (last_stripe) { | |
1969 | atomic_inc(&head_sh->count); | |
584acdd4 | 1970 | init_async_submit(&submit, txflags, tx, ops_complete_reconstruct, |
59fc630b | 1971 | head_sh, to_addr_conv(sh, percpu, j)); |
1972 | } else | |
1973 | init_async_submit(&submit, 0, tx, NULL, NULL, | |
1974 | to_addr_conv(sh, percpu, j)); | |
48769695 | 1975 | tx = async_gen_syndrome(blocks, 0, count+2, STRIPE_SIZE, &submit); |
59fc630b | 1976 | if (!last_stripe) { |
1977 | j++; | |
1978 | sh = list_first_entry(&sh->batch_list, struct stripe_head, | |
1979 | batch_list); | |
1980 | goto again; | |
1981 | } | |
91c00924 DW |
1982 | } |
1983 | ||
1984 | static void ops_complete_check(void *stripe_head_ref) | |
1985 | { | |
1986 | struct stripe_head *sh = stripe_head_ref; | |
91c00924 | 1987 | |
e46b272b | 1988 | pr_debug("%s: stripe %llu\n", __func__, |
91c00924 DW |
1989 | (unsigned long long)sh->sector); |
1990 | ||
ecc65c9b | 1991 | sh->check_state = check_state_check_result; |
91c00924 | 1992 | set_bit(STRIPE_HANDLE, &sh->state); |
6d036f7d | 1993 | raid5_release_stripe(sh); |
91c00924 DW |
1994 | } |
1995 | ||
ac6b53b6 | 1996 | static void ops_run_check_p(struct stripe_head *sh, struct raid5_percpu *percpu) |
91c00924 | 1997 | { |
91c00924 | 1998 | int disks = sh->disks; |
ac6b53b6 DW |
1999 | int pd_idx = sh->pd_idx; |
2000 | int qd_idx = sh->qd_idx; | |
2001 | struct page *xor_dest; | |
46d5b785 | 2002 | struct page **xor_srcs = to_addr_page(percpu, 0); |
91c00924 | 2003 | struct dma_async_tx_descriptor *tx; |
a08abd8c | 2004 | struct async_submit_ctl submit; |
ac6b53b6 DW |
2005 | int count; |
2006 | int i; | |
91c00924 | 2007 | |
e46b272b | 2008 | pr_debug("%s: stripe %llu\n", __func__, |
91c00924 DW |
2009 | (unsigned long long)sh->sector); |
2010 | ||
59fc630b | 2011 | BUG_ON(sh->batch_head); |
ac6b53b6 DW |
2012 | count = 0; |
2013 | xor_dest = sh->dev[pd_idx].page; | |
2014 | xor_srcs[count++] = xor_dest; | |
91c00924 | 2015 | for (i = disks; i--; ) { |
ac6b53b6 DW |
2016 | if (i == pd_idx || i == qd_idx) |
2017 | continue; | |
2018 | xor_srcs[count++] = sh->dev[i].page; | |
91c00924 DW |
2019 | } |
2020 | ||
d6f38f31 | 2021 | init_async_submit(&submit, 0, NULL, NULL, NULL, |
46d5b785 | 2022 | to_addr_conv(sh, percpu, 0)); |
099f53cb | 2023 | tx = async_xor_val(xor_dest, xor_srcs, 0, count, STRIPE_SIZE, |
a08abd8c | 2024 | &sh->ops.zero_sum_result, &submit); |
91c00924 | 2025 | |
91c00924 | 2026 | atomic_inc(&sh->count); |
a08abd8c DW |
2027 | init_async_submit(&submit, ASYNC_TX_ACK, tx, ops_complete_check, sh, NULL); |
2028 | tx = async_trigger_callback(&submit); | |
91c00924 DW |
2029 | } |
2030 | ||
ac6b53b6 DW |
2031 | static void ops_run_check_pq(struct stripe_head *sh, struct raid5_percpu *percpu, int checkp) |
2032 | { | |
46d5b785 | 2033 | struct page **srcs = to_addr_page(percpu, 0); |
ac6b53b6 DW |
2034 | struct async_submit_ctl submit; |
2035 | int count; | |
2036 | ||
2037 | pr_debug("%s: stripe %llu checkp: %d\n", __func__, | |
2038 | (unsigned long long)sh->sector, checkp); | |
2039 | ||
59fc630b | 2040 | BUG_ON(sh->batch_head); |
584acdd4 | 2041 | count = set_syndrome_sources(srcs, sh, SYNDROME_SRC_ALL); |
ac6b53b6 DW |
2042 | if (!checkp) |
2043 | srcs[count] = NULL; | |
91c00924 | 2044 | |
91c00924 | 2045 | atomic_inc(&sh->count); |
ac6b53b6 | 2046 | init_async_submit(&submit, ASYNC_TX_ACK, NULL, ops_complete_check, |
46d5b785 | 2047 | sh, to_addr_conv(sh, percpu, 0)); |
ac6b53b6 DW |
2048 | async_syndrome_val(srcs, 0, count+2, STRIPE_SIZE, |
2049 | &sh->ops.zero_sum_result, percpu->spare_page, &submit); | |
91c00924 DW |
2050 | } |
2051 | ||
51acbcec | 2052 | static void raid_run_ops(struct stripe_head *sh, unsigned long ops_request) |
91c00924 DW |
2053 | { |
2054 | int overlap_clear = 0, i, disks = sh->disks; | |
2055 | struct dma_async_tx_descriptor *tx = NULL; | |
d1688a6d | 2056 | struct r5conf *conf = sh->raid_conf; |
ac6b53b6 | 2057 | int level = conf->level; |
d6f38f31 DW |
2058 | struct raid5_percpu *percpu; |
2059 | unsigned long cpu; | |
91c00924 | 2060 | |
d6f38f31 DW |
2061 | cpu = get_cpu(); |
2062 | percpu = per_cpu_ptr(conf->percpu, cpu); | |
83de75cc | 2063 | if (test_bit(STRIPE_OP_BIOFILL, &ops_request)) { |
91c00924 DW |
2064 | ops_run_biofill(sh); |
2065 | overlap_clear++; | |
2066 | } | |
2067 | ||
7b3a871e | 2068 | if (test_bit(STRIPE_OP_COMPUTE_BLK, &ops_request)) { |
ac6b53b6 DW |
2069 | if (level < 6) |
2070 | tx = ops_run_compute5(sh, percpu); | |
2071 | else { | |
2072 | if (sh->ops.target2 < 0 || sh->ops.target < 0) | |
2073 | tx = ops_run_compute6_1(sh, percpu); | |
2074 | else | |
2075 | tx = ops_run_compute6_2(sh, percpu); | |
2076 | } | |
2077 | /* terminate the chain if reconstruct is not set to be run */ | |
2078 | if (tx && !test_bit(STRIPE_OP_RECONSTRUCT, &ops_request)) | |
7b3a871e DW |
2079 | async_tx_ack(tx); |
2080 | } | |
91c00924 | 2081 | |
584acdd4 MS |
2082 | if (test_bit(STRIPE_OP_PREXOR, &ops_request)) { |
2083 | if (level < 6) | |
2084 | tx = ops_run_prexor5(sh, percpu, tx); | |
2085 | else | |
2086 | tx = ops_run_prexor6(sh, percpu, tx); | |
2087 | } | |
91c00924 | 2088 | |
ae1713e2 AP |
2089 | if (test_bit(STRIPE_OP_PARTIAL_PARITY, &ops_request)) |
2090 | tx = ops_run_partial_parity(sh, percpu, tx); | |
2091 | ||
600aa109 | 2092 | if (test_bit(STRIPE_OP_BIODRAIN, &ops_request)) { |
d8ee0728 | 2093 | tx = ops_run_biodrain(sh, tx); |
91c00924 DW |
2094 | overlap_clear++; |
2095 | } | |
2096 | ||
ac6b53b6 DW |
2097 | if (test_bit(STRIPE_OP_RECONSTRUCT, &ops_request)) { |
2098 | if (level < 6) | |
2099 | ops_run_reconstruct5(sh, percpu, tx); | |
2100 | else | |
2101 | ops_run_reconstruct6(sh, percpu, tx); | |
2102 | } | |
91c00924 | 2103 | |
ac6b53b6 DW |
2104 | if (test_bit(STRIPE_OP_CHECK, &ops_request)) { |
2105 | if (sh->check_state == check_state_run) | |
2106 | ops_run_check_p(sh, percpu); | |
2107 | else if (sh->check_state == check_state_run_q) | |
2108 | ops_run_check_pq(sh, percpu, 0); | |
2109 | else if (sh->check_state == check_state_run_pq) | |
2110 | ops_run_check_pq(sh, percpu, 1); | |
2111 | else | |
2112 | BUG(); | |
2113 | } | |
91c00924 | 2114 | |
59fc630b | 2115 | if (overlap_clear && !sh->batch_head) |
91c00924 DW |
2116 | for (i = disks; i--; ) { |
2117 | struct r5dev *dev = &sh->dev[i]; | |
2118 | if (test_and_clear_bit(R5_Overlap, &dev->flags)) | |
2119 | wake_up(&sh->raid_conf->wait_for_overlap); | |
2120 | } | |
d6f38f31 | 2121 | put_cpu(); |
91c00924 DW |
2122 | } |
2123 | ||
845b9e22 AP |
2124 | static void free_stripe(struct kmem_cache *sc, struct stripe_head *sh) |
2125 | { | |
2126 | if (sh->ppl_page) | |
2127 | __free_page(sh->ppl_page); | |
2128 | kmem_cache_free(sc, sh); | |
2129 | } | |
2130 | ||
5f9d1fde | 2131 | static struct stripe_head *alloc_stripe(struct kmem_cache *sc, gfp_t gfp, |
845b9e22 | 2132 | int disks, struct r5conf *conf) |
f18c1a35 N |
2133 | { |
2134 | struct stripe_head *sh; | |
5f9d1fde | 2135 | int i; |
f18c1a35 N |
2136 | |
2137 | sh = kmem_cache_zalloc(sc, gfp); | |
2138 | if (sh) { | |
2139 | spin_lock_init(&sh->stripe_lock); | |
2140 | spin_lock_init(&sh->batch_lock); | |
2141 | INIT_LIST_HEAD(&sh->batch_list); | |
2142 | INIT_LIST_HEAD(&sh->lru); | |
a39f7afd | 2143 | INIT_LIST_HEAD(&sh->r5c); |
d7bd398e | 2144 | INIT_LIST_HEAD(&sh->log_list); |
f18c1a35 | 2145 | atomic_set(&sh->count, 1); |
845b9e22 | 2146 | sh->raid_conf = conf; |
a39f7afd | 2147 | sh->log_start = MaxSector; |
5f9d1fde SL |
2148 | for (i = 0; i < disks; i++) { |
2149 | struct r5dev *dev = &sh->dev[i]; | |
2150 | ||
3a83f467 ML |
2151 | bio_init(&dev->req, &dev->vec, 1); |
2152 | bio_init(&dev->rreq, &dev->rvec, 1); | |
5f9d1fde | 2153 | } |
845b9e22 AP |
2154 | |
2155 | if (raid5_has_ppl(conf)) { | |
2156 | sh->ppl_page = alloc_page(gfp); | |
2157 | if (!sh->ppl_page) { | |
2158 | free_stripe(sc, sh); | |
2159 | sh = NULL; | |
2160 | } | |
2161 | } | |
f18c1a35 N |
2162 | } |
2163 | return sh; | |
2164 | } | |
486f0644 | 2165 | static int grow_one_stripe(struct r5conf *conf, gfp_t gfp) |
1da177e4 LT |
2166 | { |
2167 | struct stripe_head *sh; | |
f18c1a35 | 2168 | |
845b9e22 | 2169 | sh = alloc_stripe(conf->slab_cache, gfp, conf->pool_size, conf); |
3f294f4f N |
2170 | if (!sh) |
2171 | return 0; | |
6ce32846 | 2172 | |
a9683a79 | 2173 | if (grow_buffers(sh, gfp)) { |
e4e11e38 | 2174 | shrink_buffers(sh); |
845b9e22 | 2175 | free_stripe(conf->slab_cache, sh); |
3f294f4f N |
2176 | return 0; |
2177 | } | |
486f0644 N |
2178 | sh->hash_lock_index = |
2179 | conf->max_nr_stripes % NR_STRIPE_HASH_LOCKS; | |
3f294f4f | 2180 | /* we just created an active stripe so... */ |
3f294f4f | 2181 | atomic_inc(&conf->active_stripes); |
59fc630b | 2182 | |
6d036f7d | 2183 | raid5_release_stripe(sh); |
486f0644 | 2184 | conf->max_nr_stripes++; |
3f294f4f N |
2185 | return 1; |
2186 | } | |
2187 | ||
d1688a6d | 2188 | static int grow_stripes(struct r5conf *conf, int num) |
3f294f4f | 2189 | { |
e18b890b | 2190 | struct kmem_cache *sc; |
53b8d89d | 2191 | size_t namelen = sizeof(conf->cache_name[0]); |
5e5e3e78 | 2192 | int devs = max(conf->raid_disks, conf->previous_raid_disks); |
1da177e4 | 2193 | |
f4be6b43 | 2194 | if (conf->mddev->gendisk) |
53b8d89d | 2195 | snprintf(conf->cache_name[0], namelen, |
f4be6b43 N |
2196 | "raid%d-%s", conf->level, mdname(conf->mddev)); |
2197 | else | |
53b8d89d | 2198 | snprintf(conf->cache_name[0], namelen, |
f4be6b43 | 2199 | "raid%d-%p", conf->level, conf->mddev); |
53b8d89d | 2200 | snprintf(conf->cache_name[1], namelen, "%.27s-alt", conf->cache_name[0]); |
f4be6b43 | 2201 | |
ad01c9e3 N |
2202 | conf->active_name = 0; |
2203 | sc = kmem_cache_create(conf->cache_name[conf->active_name], | |
1da177e4 | 2204 | sizeof(struct stripe_head)+(devs-1)*sizeof(struct r5dev), |
20c2df83 | 2205 | 0, 0, NULL); |
1da177e4 LT |
2206 | if (!sc) |
2207 | return 1; | |
2208 | conf->slab_cache = sc; | |
ad01c9e3 | 2209 | conf->pool_size = devs; |
486f0644 N |
2210 | while (num--) |
2211 | if (!grow_one_stripe(conf, GFP_KERNEL)) | |
1da177e4 | 2212 | return 1; |
486f0644 | 2213 | |
1da177e4 LT |
2214 | return 0; |
2215 | } | |
29269553 | 2216 | |
d6f38f31 DW |
2217 | /** |
2218 | * scribble_len - return the required size of the scribble region | |
2219 | * @num - total number of disks in the array | |
2220 | * | |
2221 | * The size must be enough to contain: | |
2222 | * 1/ a struct page pointer for each device in the array +2 | |
2223 | * 2/ room to convert each entry in (1) to its corresponding dma | |
2224 | * (dma_map_page()) or page (page_address()) address. | |
2225 | * | |
2226 | * Note: the +2 is for the destination buffers of the ddf/raid6 case where we | |
2227 | * calculate over all devices (not just the data blocks), using zeros in place | |
2228 | * of the P and Q blocks. | |
2229 | */ | |
b330e6a4 KO |
2230 | static int scribble_alloc(struct raid5_percpu *percpu, |
2231 | int num, int cnt, gfp_t flags) | |
d6f38f31 | 2232 | { |
b330e6a4 KO |
2233 | size_t obj_size = |
2234 | sizeof(struct page *) * (num+2) + | |
2235 | sizeof(addr_conv_t) * (num+2); | |
2236 | void *scribble; | |
d6f38f31 | 2237 | |
b330e6a4 KO |
2238 | scribble = kvmalloc_array(cnt, obj_size, flags); |
2239 | if (!scribble) | |
2240 | return -ENOMEM; | |
2241 | ||
2242 | kvfree(percpu->scribble); | |
2243 | ||
2244 | percpu->scribble = scribble; | |
2245 | percpu->scribble_obj_size = obj_size; | |
2246 | return 0; | |
d6f38f31 DW |
2247 | } |
2248 | ||
738a2738 N |
2249 | static int resize_chunks(struct r5conf *conf, int new_disks, int new_sectors) |
2250 | { | |
2251 | unsigned long cpu; | |
2252 | int err = 0; | |
2253 | ||
27a353c0 SL |
2254 | /* |
2255 | * Never shrink. And mddev_suspend() could deadlock if this is called | |
2256 | * from raid5d. In that case, scribble_disks and scribble_sectors | |
2257 | * should equal to new_disks and new_sectors | |
2258 | */ | |
2259 | if (conf->scribble_disks >= new_disks && | |
2260 | conf->scribble_sectors >= new_sectors) | |
2261 | return 0; | |
738a2738 N |
2262 | mddev_suspend(conf->mddev); |
2263 | get_online_cpus(); | |
b330e6a4 | 2264 | |
738a2738 N |
2265 | for_each_present_cpu(cpu) { |
2266 | struct raid5_percpu *percpu; | |
738a2738 N |
2267 | |
2268 | percpu = per_cpu_ptr(conf->percpu, cpu); | |
b330e6a4 KO |
2269 | err = scribble_alloc(percpu, new_disks, |
2270 | new_sectors / STRIPE_SECTORS, | |
2271 | GFP_NOIO); | |
2272 | if (err) | |
738a2738 | 2273 | break; |
738a2738 | 2274 | } |
b330e6a4 | 2275 | |
738a2738 N |
2276 | put_online_cpus(); |
2277 | mddev_resume(conf->mddev); | |
27a353c0 SL |
2278 | if (!err) { |
2279 | conf->scribble_disks = new_disks; | |
2280 | conf->scribble_sectors = new_sectors; | |
2281 | } | |
738a2738 N |
2282 | return err; |
2283 | } | |
2284 | ||
d1688a6d | 2285 | static int resize_stripes(struct r5conf *conf, int newsize) |
ad01c9e3 N |
2286 | { |
2287 | /* Make all the stripes able to hold 'newsize' devices. | |
2288 | * New slots in each stripe get 'page' set to a new page. | |
2289 | * | |
2290 | * This happens in stages: | |
2291 | * 1/ create a new kmem_cache and allocate the required number of | |
2292 | * stripe_heads. | |
83f0d77a | 2293 | * 2/ gather all the old stripe_heads and transfer the pages across |
ad01c9e3 N |
2294 | * to the new stripe_heads. This will have the side effect of |
2295 | * freezing the array as once all stripe_heads have been collected, | |
2296 | * no IO will be possible. Old stripe heads are freed once their | |
2297 | * pages have been transferred over, and the old kmem_cache is | |
2298 | * freed when all stripes are done. | |
2299 | * 3/ reallocate conf->disks to be suitable bigger. If this fails, | |
3560741e | 2300 | * we simple return a failure status - no need to clean anything up. |
ad01c9e3 N |
2301 | * 4/ allocate new pages for the new slots in the new stripe_heads. |
2302 | * If this fails, we don't bother trying the shrink the | |
2303 | * stripe_heads down again, we just leave them as they are. | |
2304 | * As each stripe_head is processed the new one is released into | |
2305 | * active service. | |
2306 | * | |
2307 | * Once step2 is started, we cannot afford to wait for a write, | |
2308 | * so we use GFP_NOIO allocations. | |
2309 | */ | |
2310 | struct stripe_head *osh, *nsh; | |
2311 | LIST_HEAD(newstripes); | |
2312 | struct disk_info *ndisks; | |
2214c260 | 2313 | int err = 0; |
e18b890b | 2314 | struct kmem_cache *sc; |
ad01c9e3 | 2315 | int i; |
566c09c5 | 2316 | int hash, cnt; |
ad01c9e3 | 2317 | |
2214c260 | 2318 | md_allow_write(conf->mddev); |
2a2275d6 | 2319 | |
ad01c9e3 N |
2320 | /* Step 1 */ |
2321 | sc = kmem_cache_create(conf->cache_name[1-conf->active_name], | |
2322 | sizeof(struct stripe_head)+(newsize-1)*sizeof(struct r5dev), | |
20c2df83 | 2323 | 0, 0, NULL); |
ad01c9e3 N |
2324 | if (!sc) |
2325 | return -ENOMEM; | |
2326 | ||
2d5b569b N |
2327 | /* Need to ensure auto-resizing doesn't interfere */ |
2328 | mutex_lock(&conf->cache_size_mutex); | |
2329 | ||
ad01c9e3 | 2330 | for (i = conf->max_nr_stripes; i; i--) { |
845b9e22 | 2331 | nsh = alloc_stripe(sc, GFP_KERNEL, newsize, conf); |
ad01c9e3 N |
2332 | if (!nsh) |
2333 | break; | |
2334 | ||
ad01c9e3 N |
2335 | list_add(&nsh->lru, &newstripes); |
2336 | } | |
2337 | if (i) { | |
2338 | /* didn't get enough, give up */ | |
2339 | while (!list_empty(&newstripes)) { | |
2340 | nsh = list_entry(newstripes.next, struct stripe_head, lru); | |
2341 | list_del(&nsh->lru); | |
845b9e22 | 2342 | free_stripe(sc, nsh); |
ad01c9e3 N |
2343 | } |
2344 | kmem_cache_destroy(sc); | |
2d5b569b | 2345 | mutex_unlock(&conf->cache_size_mutex); |
ad01c9e3 N |
2346 | return -ENOMEM; |
2347 | } | |
2348 | /* Step 2 - Must use GFP_NOIO now. | |
2349 | * OK, we have enough stripes, start collecting inactive | |
2350 | * stripes and copying them over | |
2351 | */ | |
566c09c5 SL |
2352 | hash = 0; |
2353 | cnt = 0; | |
ad01c9e3 | 2354 | list_for_each_entry(nsh, &newstripes, lru) { |
566c09c5 | 2355 | lock_device_hash_lock(conf, hash); |
6ab2a4b8 | 2356 | wait_event_cmd(conf->wait_for_stripe, |
566c09c5 SL |
2357 | !list_empty(conf->inactive_list + hash), |
2358 | unlock_device_hash_lock(conf, hash), | |
2359 | lock_device_hash_lock(conf, hash)); | |
2360 | osh = get_free_stripe(conf, hash); | |
2361 | unlock_device_hash_lock(conf, hash); | |
f18c1a35 | 2362 | |
d592a996 | 2363 | for(i=0; i<conf->pool_size; i++) { |
ad01c9e3 | 2364 | nsh->dev[i].page = osh->dev[i].page; |
d592a996 SL |
2365 | nsh->dev[i].orig_page = osh->dev[i].page; |
2366 | } | |
566c09c5 | 2367 | nsh->hash_lock_index = hash; |
845b9e22 | 2368 | free_stripe(conf->slab_cache, osh); |
566c09c5 SL |
2369 | cnt++; |
2370 | if (cnt >= conf->max_nr_stripes / NR_STRIPE_HASH_LOCKS + | |
2371 | !!((conf->max_nr_stripes % NR_STRIPE_HASH_LOCKS) > hash)) { | |
2372 | hash++; | |
2373 | cnt = 0; | |
2374 | } | |
ad01c9e3 N |
2375 | } |
2376 | kmem_cache_destroy(conf->slab_cache); | |
2377 | ||
2378 | /* Step 3. | |
2379 | * At this point, we are holding all the stripes so the array | |
2380 | * is completely stalled, so now is a good time to resize | |
d6f38f31 | 2381 | * conf->disks and the scribble region |
ad01c9e3 | 2382 | */ |
6396bb22 | 2383 | ndisks = kcalloc(newsize, sizeof(struct disk_info), GFP_NOIO); |
ad01c9e3 | 2384 | if (ndisks) { |
d7bd398e | 2385 | for (i = 0; i < conf->pool_size; i++) |
ad01c9e3 | 2386 | ndisks[i] = conf->disks[i]; |
d7bd398e SL |
2387 | |
2388 | for (i = conf->pool_size; i < newsize; i++) { | |
2389 | ndisks[i].extra_page = alloc_page(GFP_NOIO); | |
2390 | if (!ndisks[i].extra_page) | |
2391 | err = -ENOMEM; | |
2392 | } | |
2393 | ||
2394 | if (err) { | |
2395 | for (i = conf->pool_size; i < newsize; i++) | |
2396 | if (ndisks[i].extra_page) | |
2397 | put_page(ndisks[i].extra_page); | |
2398 | kfree(ndisks); | |
2399 | } else { | |
2400 | kfree(conf->disks); | |
2401 | conf->disks = ndisks; | |
2402 | } | |
ad01c9e3 N |
2403 | } else |
2404 | err = -ENOMEM; | |
2405 | ||
2d5b569b | 2406 | mutex_unlock(&conf->cache_size_mutex); |
583da48e DY |
2407 | |
2408 | conf->slab_cache = sc; | |
2409 | conf->active_name = 1-conf->active_name; | |
2410 | ||
ad01c9e3 N |
2411 | /* Step 4, return new stripes to service */ |
2412 | while(!list_empty(&newstripes)) { | |
2413 | nsh = list_entry(newstripes.next, struct stripe_head, lru); | |
2414 | list_del_init(&nsh->lru); | |
d6f38f31 | 2415 | |
ad01c9e3 N |
2416 | for (i=conf->raid_disks; i < newsize; i++) |
2417 | if (nsh->dev[i].page == NULL) { | |
2418 | struct page *p = alloc_page(GFP_NOIO); | |
2419 | nsh->dev[i].page = p; | |
d592a996 | 2420 | nsh->dev[i].orig_page = p; |
ad01c9e3 N |
2421 | if (!p) |
2422 | err = -ENOMEM; | |
2423 | } | |
6d036f7d | 2424 | raid5_release_stripe(nsh); |
ad01c9e3 N |
2425 | } |
2426 | /* critical section pass, GFP_NOIO no longer needed */ | |
2427 | ||
6e9eac2d N |
2428 | if (!err) |
2429 | conf->pool_size = newsize; | |
ad01c9e3 N |
2430 | return err; |
2431 | } | |
1da177e4 | 2432 | |
486f0644 | 2433 | static int drop_one_stripe(struct r5conf *conf) |
1da177e4 LT |
2434 | { |
2435 | struct stripe_head *sh; | |
49895bcc | 2436 | int hash = (conf->max_nr_stripes - 1) & STRIPE_HASH_LOCKS_MASK; |
1da177e4 | 2437 | |
566c09c5 SL |
2438 | spin_lock_irq(conf->hash_locks + hash); |
2439 | sh = get_free_stripe(conf, hash); | |
2440 | spin_unlock_irq(conf->hash_locks + hash); | |
3f294f4f N |
2441 | if (!sh) |
2442 | return 0; | |
78bafebd | 2443 | BUG_ON(atomic_read(&sh->count)); |
e4e11e38 | 2444 | shrink_buffers(sh); |
845b9e22 | 2445 | free_stripe(conf->slab_cache, sh); |
3f294f4f | 2446 | atomic_dec(&conf->active_stripes); |
486f0644 | 2447 | conf->max_nr_stripes--; |
3f294f4f N |
2448 | return 1; |
2449 | } | |
2450 | ||
d1688a6d | 2451 | static void shrink_stripes(struct r5conf *conf) |
3f294f4f | 2452 | { |
486f0644 N |
2453 | while (conf->max_nr_stripes && |
2454 | drop_one_stripe(conf)) | |
2455 | ; | |
3f294f4f | 2456 | |
644df1a8 | 2457 | kmem_cache_destroy(conf->slab_cache); |
1da177e4 LT |
2458 | conf->slab_cache = NULL; |
2459 | } | |
2460 | ||
4246a0b6 | 2461 | static void raid5_end_read_request(struct bio * bi) |
1da177e4 | 2462 | { |
99c0fb5f | 2463 | struct stripe_head *sh = bi->bi_private; |
d1688a6d | 2464 | struct r5conf *conf = sh->raid_conf; |
7ecaa1e6 | 2465 | int disks = sh->disks, i; |
d6950432 | 2466 | char b[BDEVNAME_SIZE]; |
dd054fce | 2467 | struct md_rdev *rdev = NULL; |
05616be5 | 2468 | sector_t s; |
1da177e4 LT |
2469 | |
2470 | for (i=0 ; i<disks; i++) | |
2471 | if (bi == &sh->dev[i].req) | |
2472 | break; | |
2473 | ||
4246a0b6 | 2474 | pr_debug("end_read_request %llu/%d, count: %d, error %d.\n", |
45b4233c | 2475 | (unsigned long long)sh->sector, i, atomic_read(&sh->count), |
4e4cbee9 | 2476 | bi->bi_status); |
1da177e4 | 2477 | if (i == disks) { |
5f9d1fde | 2478 | bio_reset(bi); |
1da177e4 | 2479 | BUG(); |
6712ecf8 | 2480 | return; |
1da177e4 | 2481 | } |
14a75d3e | 2482 | if (test_bit(R5_ReadRepl, &sh->dev[i].flags)) |
dd054fce N |
2483 | /* If replacement finished while this request was outstanding, |
2484 | * 'replacement' might be NULL already. | |
2485 | * In that case it moved down to 'rdev'. | |
2486 | * rdev is not removed until all requests are finished. | |
2487 | */ | |
14a75d3e | 2488 | rdev = conf->disks[i].replacement; |
dd054fce | 2489 | if (!rdev) |
14a75d3e | 2490 | rdev = conf->disks[i].rdev; |
1da177e4 | 2491 | |
05616be5 N |
2492 | if (use_new_offset(conf, sh)) |
2493 | s = sh->sector + rdev->new_data_offset; | |
2494 | else | |
2495 | s = sh->sector + rdev->data_offset; | |
4e4cbee9 | 2496 | if (!bi->bi_status) { |
1da177e4 | 2497 | set_bit(R5_UPTODATE, &sh->dev[i].flags); |
4e5314b5 | 2498 | if (test_bit(R5_ReadError, &sh->dev[i].flags)) { |
14a75d3e N |
2499 | /* Note that this cannot happen on a |
2500 | * replacement device. We just fail those on | |
2501 | * any error | |
2502 | */ | |
cc6167b4 N |
2503 | pr_info_ratelimited( |
2504 | "md/raid:%s: read error corrected (%lu sectors at %llu on %s)\n", | |
8bda470e | 2505 | mdname(conf->mddev), STRIPE_SECTORS, |
05616be5 | 2506 | (unsigned long long)s, |
8bda470e | 2507 | bdevname(rdev->bdev, b)); |
ddd5115f | 2508 | atomic_add(STRIPE_SECTORS, &rdev->corrected_errors); |
4e5314b5 N |
2509 | clear_bit(R5_ReadError, &sh->dev[i].flags); |
2510 | clear_bit(R5_ReWrite, &sh->dev[i].flags); | |
3f9e7c14 | 2511 | } else if (test_bit(R5_ReadNoMerge, &sh->dev[i].flags)) |
2512 | clear_bit(R5_ReadNoMerge, &sh->dev[i].flags); | |
2513 | ||
86aa1397 SL |
2514 | if (test_bit(R5_InJournal, &sh->dev[i].flags)) |
2515 | /* | |
2516 | * end read for a page in journal, this | |
2517 | * must be preparing for prexor in rmw | |
2518 | */ | |
2519 | set_bit(R5_OrigPageUPTDODATE, &sh->dev[i].flags); | |
2520 | ||
14a75d3e N |
2521 | if (atomic_read(&rdev->read_errors)) |
2522 | atomic_set(&rdev->read_errors, 0); | |
1da177e4 | 2523 | } else { |
14a75d3e | 2524 | const char *bdn = bdevname(rdev->bdev, b); |
ba22dcbf | 2525 | int retry = 0; |
2e8ac303 | 2526 | int set_bad = 0; |
d6950432 | 2527 | |
1da177e4 | 2528 | clear_bit(R5_UPTODATE, &sh->dev[i].flags); |
b76b4715 NC |
2529 | if (!(bi->bi_status == BLK_STS_PROTECTION)) |
2530 | atomic_inc(&rdev->read_errors); | |
14a75d3e | 2531 | if (test_bit(R5_ReadRepl, &sh->dev[i].flags)) |
cc6167b4 N |
2532 | pr_warn_ratelimited( |
2533 | "md/raid:%s: read error on replacement device (sector %llu on %s).\n", | |
14a75d3e | 2534 | mdname(conf->mddev), |
05616be5 | 2535 | (unsigned long long)s, |
14a75d3e | 2536 | bdn); |
2e8ac303 | 2537 | else if (conf->mddev->degraded >= conf->max_degraded) { |
2538 | set_bad = 1; | |
cc6167b4 N |
2539 | pr_warn_ratelimited( |
2540 | "md/raid:%s: read error not correctable (sector %llu on %s).\n", | |
8bda470e | 2541 | mdname(conf->mddev), |
05616be5 | 2542 | (unsigned long long)s, |
8bda470e | 2543 | bdn); |
2e8ac303 | 2544 | } else if (test_bit(R5_ReWrite, &sh->dev[i].flags)) { |
4e5314b5 | 2545 | /* Oh, no!!! */ |
2e8ac303 | 2546 | set_bad = 1; |
cc6167b4 N |
2547 | pr_warn_ratelimited( |
2548 | "md/raid:%s: read error NOT corrected!! (sector %llu on %s).\n", | |
8bda470e | 2549 | mdname(conf->mddev), |
05616be5 | 2550 | (unsigned long long)s, |
8bda470e | 2551 | bdn); |
2e8ac303 | 2552 | } else if (atomic_read(&rdev->read_errors) |
0009fad0 NC |
2553 | > conf->max_nr_stripes) { |
2554 | if (!test_bit(Faulty, &rdev->flags)) { | |
2555 | pr_warn("md/raid:%s: %d read_errors > %d stripes\n", | |
2556 | mdname(conf->mddev), | |
2557 | atomic_read(&rdev->read_errors), | |
2558 | conf->max_nr_stripes); | |
2559 | pr_warn("md/raid:%s: Too many read errors, failing device %s.\n", | |
2560 | mdname(conf->mddev), bdn); | |
2561 | } | |
2562 | } else | |
ba22dcbf | 2563 | retry = 1; |
edfa1f65 BY |
2564 | if (set_bad && test_bit(In_sync, &rdev->flags) |
2565 | && !test_bit(R5_ReadNoMerge, &sh->dev[i].flags)) | |
2566 | retry = 1; | |
ba22dcbf | 2567 | if (retry) |
143f6e73 XN |
2568 | if (sh->qd_idx >= 0 && sh->pd_idx == i) |
2569 | set_bit(R5_ReadError, &sh->dev[i].flags); | |
2570 | else if (test_bit(R5_ReadNoMerge, &sh->dev[i].flags)) { | |
3f9e7c14 | 2571 | set_bit(R5_ReadError, &sh->dev[i].flags); |
2572 | clear_bit(R5_ReadNoMerge, &sh->dev[i].flags); | |
2573 | } else | |
2574 | set_bit(R5_ReadNoMerge, &sh->dev[i].flags); | |
ba22dcbf | 2575 | else { |
4e5314b5 N |
2576 | clear_bit(R5_ReadError, &sh->dev[i].flags); |
2577 | clear_bit(R5_ReWrite, &sh->dev[i].flags); | |
2e8ac303 | 2578 | if (!(set_bad |
2579 | && test_bit(In_sync, &rdev->flags) | |
2580 | && rdev_set_badblocks( | |
2581 | rdev, sh->sector, STRIPE_SECTORS, 0))) | |
2582 | md_error(conf->mddev, rdev); | |
ba22dcbf | 2583 | } |
1da177e4 | 2584 | } |
14a75d3e | 2585 | rdev_dec_pending(rdev, conf->mddev); |
c9445555 | 2586 | bio_reset(bi); |
1da177e4 LT |
2587 | clear_bit(R5_LOCKED, &sh->dev[i].flags); |
2588 | set_bit(STRIPE_HANDLE, &sh->state); | |
6d036f7d | 2589 | raid5_release_stripe(sh); |
1da177e4 LT |
2590 | } |
2591 | ||
4246a0b6 | 2592 | static void raid5_end_write_request(struct bio *bi) |
1da177e4 | 2593 | { |
99c0fb5f | 2594 | struct stripe_head *sh = bi->bi_private; |
d1688a6d | 2595 | struct r5conf *conf = sh->raid_conf; |
7ecaa1e6 | 2596 | int disks = sh->disks, i; |
977df362 | 2597 | struct md_rdev *uninitialized_var(rdev); |
b84db560 N |
2598 | sector_t first_bad; |
2599 | int bad_sectors; | |
977df362 | 2600 | int replacement = 0; |
1da177e4 | 2601 | |
977df362 N |
2602 | for (i = 0 ; i < disks; i++) { |
2603 | if (bi == &sh->dev[i].req) { | |
2604 | rdev = conf->disks[i].rdev; | |
1da177e4 | 2605 | break; |
977df362 N |
2606 | } |
2607 | if (bi == &sh->dev[i].rreq) { | |
2608 | rdev = conf->disks[i].replacement; | |
dd054fce N |
2609 | if (rdev) |
2610 | replacement = 1; | |
2611 | else | |
2612 | /* rdev was removed and 'replacement' | |
2613 | * replaced it. rdev is not removed | |
2614 | * until all requests are finished. | |
2615 | */ | |
2616 | rdev = conf->disks[i].rdev; | |
977df362 N |
2617 | break; |
2618 | } | |
2619 | } | |
4246a0b6 | 2620 | pr_debug("end_write_request %llu/%d, count %d, error: %d.\n", |
1da177e4 | 2621 | (unsigned long long)sh->sector, i, atomic_read(&sh->count), |
4e4cbee9 | 2622 | bi->bi_status); |
1da177e4 | 2623 | if (i == disks) { |
5f9d1fde | 2624 | bio_reset(bi); |
1da177e4 | 2625 | BUG(); |
6712ecf8 | 2626 | return; |
1da177e4 LT |
2627 | } |
2628 | ||
977df362 | 2629 | if (replacement) { |
4e4cbee9 | 2630 | if (bi->bi_status) |
977df362 N |
2631 | md_error(conf->mddev, rdev); |
2632 | else if (is_badblock(rdev, sh->sector, | |
2633 | STRIPE_SECTORS, | |
2634 | &first_bad, &bad_sectors)) | |
2635 | set_bit(R5_MadeGoodRepl, &sh->dev[i].flags); | |
2636 | } else { | |
4e4cbee9 | 2637 | if (bi->bi_status) { |
9f97e4b1 | 2638 | set_bit(STRIPE_DEGRADED, &sh->state); |
977df362 N |
2639 | set_bit(WriteErrorSeen, &rdev->flags); |
2640 | set_bit(R5_WriteError, &sh->dev[i].flags); | |
3a6de292 N |
2641 | if (!test_and_set_bit(WantReplacement, &rdev->flags)) |
2642 | set_bit(MD_RECOVERY_NEEDED, | |
2643 | &rdev->mddev->recovery); | |
977df362 N |
2644 | } else if (is_badblock(rdev, sh->sector, |
2645 | STRIPE_SECTORS, | |
c0b32972 | 2646 | &first_bad, &bad_sectors)) { |
977df362 | 2647 | set_bit(R5_MadeGood, &sh->dev[i].flags); |
c0b32972 N |
2648 | if (test_bit(R5_ReadError, &sh->dev[i].flags)) |
2649 | /* That was a successful write so make | |
2650 | * sure it looks like we already did | |
2651 | * a re-write. | |
2652 | */ | |
2653 | set_bit(R5_ReWrite, &sh->dev[i].flags); | |
2654 | } | |
977df362 N |
2655 | } |
2656 | rdev_dec_pending(rdev, conf->mddev); | |
1da177e4 | 2657 | |
4e4cbee9 | 2658 | if (sh->batch_head && bi->bi_status && !replacement) |
72ac7330 | 2659 | set_bit(STRIPE_BATCH_ERR, &sh->batch_head->state); |
2660 | ||
c9445555 | 2661 | bio_reset(bi); |
977df362 N |
2662 | if (!test_and_clear_bit(R5_DOUBLE_LOCKED, &sh->dev[i].flags)) |
2663 | clear_bit(R5_LOCKED, &sh->dev[i].flags); | |
1da177e4 | 2664 | set_bit(STRIPE_HANDLE, &sh->state); |
6d036f7d | 2665 | raid5_release_stripe(sh); |
59fc630b | 2666 | |
2667 | if (sh->batch_head && sh != sh->batch_head) | |
6d036f7d | 2668 | raid5_release_stripe(sh->batch_head); |
1da177e4 LT |
2669 | } |
2670 | ||
849674e4 | 2671 | static void raid5_error(struct mddev *mddev, struct md_rdev *rdev) |
1da177e4 LT |
2672 | { |
2673 | char b[BDEVNAME_SIZE]; | |
d1688a6d | 2674 | struct r5conf *conf = mddev->private; |
908f4fbd | 2675 | unsigned long flags; |
0c55e022 | 2676 | pr_debug("raid456: error called\n"); |
1da177e4 | 2677 | |
908f4fbd | 2678 | spin_lock_irqsave(&conf->device_lock, flags); |
fb73b357 MT |
2679 | |
2680 | if (test_bit(In_sync, &rdev->flags) && | |
2681 | mddev->degraded == conf->max_degraded) { | |
2682 | /* | |
2683 | * Don't allow to achieve failed state | |
2684 | * Don't try to recover this device | |
2685 | */ | |
2686 | conf->recovery_disabled = mddev->recovery_disabled; | |
2687 | spin_unlock_irqrestore(&conf->device_lock, flags); | |
2688 | return; | |
2689 | } | |
2690 | ||
aff69d89 | 2691 | set_bit(Faulty, &rdev->flags); |
908f4fbd | 2692 | clear_bit(In_sync, &rdev->flags); |
2e38a37f | 2693 | mddev->degraded = raid5_calc_degraded(conf); |
908f4fbd N |
2694 | spin_unlock_irqrestore(&conf->device_lock, flags); |
2695 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); | |
2696 | ||
de393cde | 2697 | set_bit(Blocked, &rdev->flags); |
2953079c SL |
2698 | set_mask_bits(&mddev->sb_flags, 0, |
2699 | BIT(MD_SB_CHANGE_DEVS) | BIT(MD_SB_CHANGE_PENDING)); | |
cc6167b4 N |
2700 | pr_crit("md/raid:%s: Disk failure on %s, disabling device.\n" |
2701 | "md/raid:%s: Operation continuing on %d devices.\n", | |
2702 | mdname(mddev), | |
2703 | bdevname(rdev->bdev, b), | |
2704 | mdname(mddev), | |
2705 | conf->raid_disks - mddev->degraded); | |
70d466f7 | 2706 | r5c_update_on_rdev_error(mddev, rdev); |
16a53ecc | 2707 | } |
1da177e4 LT |
2708 | |
2709 | /* | |
2710 | * Input: a 'big' sector number, | |
2711 | * Output: index of the data and parity disk, and the sector # in them. | |
2712 | */ | |
6d036f7d SL |
2713 | sector_t raid5_compute_sector(struct r5conf *conf, sector_t r_sector, |
2714 | int previous, int *dd_idx, | |
2715 | struct stripe_head *sh) | |
1da177e4 | 2716 | { |
6e3b96ed | 2717 | sector_t stripe, stripe2; |
35f2a591 | 2718 | sector_t chunk_number; |
1da177e4 | 2719 | unsigned int chunk_offset; |
911d4ee8 | 2720 | int pd_idx, qd_idx; |
67cc2b81 | 2721 | int ddf_layout = 0; |
1da177e4 | 2722 | sector_t new_sector; |
e183eaed N |
2723 | int algorithm = previous ? conf->prev_algo |
2724 | : conf->algorithm; | |
09c9e5fa AN |
2725 | int sectors_per_chunk = previous ? conf->prev_chunk_sectors |
2726 | : conf->chunk_sectors; | |
112bf897 N |
2727 | int raid_disks = previous ? conf->previous_raid_disks |
2728 | : conf->raid_disks; | |
2729 | int data_disks = raid_disks - conf->max_degraded; | |
1da177e4 LT |
2730 | |
2731 | /* First compute the information on this sector */ | |
2732 | ||
2733 | /* | |
2734 | * Compute the chunk number and the sector offset inside the chunk | |
2735 | */ | |
2736 | chunk_offset = sector_div(r_sector, sectors_per_chunk); | |
2737 | chunk_number = r_sector; | |
1da177e4 LT |
2738 | |
2739 | /* | |
2740 | * Compute the stripe number | |
2741 | */ | |
35f2a591 N |
2742 | stripe = chunk_number; |
2743 | *dd_idx = sector_div(stripe, data_disks); | |
6e3b96ed | 2744 | stripe2 = stripe; |
1da177e4 LT |
2745 | /* |
2746 | * Select the parity disk based on the user selected algorithm. | |
2747 | */ | |
84789554 | 2748 | pd_idx = qd_idx = -1; |
16a53ecc N |
2749 | switch(conf->level) { |
2750 | case 4: | |
911d4ee8 | 2751 | pd_idx = data_disks; |
16a53ecc N |
2752 | break; |
2753 | case 5: | |
e183eaed | 2754 | switch (algorithm) { |
1da177e4 | 2755 | case ALGORITHM_LEFT_ASYMMETRIC: |
6e3b96ed | 2756 | pd_idx = data_disks - sector_div(stripe2, raid_disks); |
911d4ee8 | 2757 | if (*dd_idx >= pd_idx) |
1da177e4 LT |
2758 | (*dd_idx)++; |
2759 | break; | |
2760 | case ALGORITHM_RIGHT_ASYMMETRIC: | |
6e3b96ed | 2761 | pd_idx = sector_div(stripe2, raid_disks); |
911d4ee8 | 2762 | if (*dd_idx >= pd_idx) |
1da177e4 LT |
2763 | (*dd_idx)++; |
2764 | break; | |
2765 | case ALGORITHM_LEFT_SYMMETRIC: | |
6e3b96ed | 2766 | pd_idx = data_disks - sector_div(stripe2, raid_disks); |
911d4ee8 | 2767 | *dd_idx = (pd_idx + 1 + *dd_idx) % raid_disks; |
1da177e4 LT |
2768 | break; |
2769 | case ALGORITHM_RIGHT_SYMMETRIC: | |
6e3b96ed | 2770 | pd_idx = sector_div(stripe2, raid_disks); |
911d4ee8 | 2771 | *dd_idx = (pd_idx + 1 + *dd_idx) % raid_disks; |
1da177e4 | 2772 | break; |
99c0fb5f N |
2773 | case ALGORITHM_PARITY_0: |
2774 | pd_idx = 0; | |
2775 | (*dd_idx)++; | |
2776 | break; | |
2777 | case ALGORITHM_PARITY_N: | |
2778 | pd_idx = data_disks; | |
2779 | break; | |
1da177e4 | 2780 | default: |
99c0fb5f | 2781 | BUG(); |
16a53ecc N |
2782 | } |
2783 | break; | |
2784 | case 6: | |
2785 | ||
e183eaed | 2786 | switch (algorithm) { |
16a53ecc | 2787 | case ALGORITHM_LEFT_ASYMMETRIC: |
6e3b96ed | 2788 | pd_idx = raid_disks - 1 - sector_div(stripe2, raid_disks); |
911d4ee8 N |
2789 | qd_idx = pd_idx + 1; |
2790 | if (pd_idx == raid_disks-1) { | |
99c0fb5f | 2791 | (*dd_idx)++; /* Q D D D P */ |
911d4ee8 N |
2792 | qd_idx = 0; |
2793 | } else if (*dd_idx >= pd_idx) | |
16a53ecc N |
2794 | (*dd_idx) += 2; /* D D P Q D */ |
2795 | break; | |
2796 | case ALGORITHM_RIGHT_ASYMMETRIC: | |
6e3b96ed | 2797 | pd_idx = sector_div(stripe2, raid_disks); |
911d4ee8 N |
2798 | qd_idx = pd_idx + 1; |
2799 | if (pd_idx == raid_disks-1) { | |
99c0fb5f | 2800 | (*dd_idx)++; /* Q D D D P */ |
911d4ee8 N |
2801 | qd_idx = 0; |
2802 | } else if (*dd_idx >= pd_idx) | |
16a53ecc N |
2803 | (*dd_idx) += 2; /* D D P Q D */ |
2804 | break; | |
2805 | case ALGORITHM_LEFT_SYMMETRIC: | |
6e3b96ed | 2806 | pd_idx = raid_disks - 1 - sector_div(stripe2, raid_disks); |
911d4ee8 N |
2807 | qd_idx = (pd_idx + 1) % raid_disks; |
2808 | *dd_idx = (pd_idx + 2 + *dd_idx) % raid_disks; | |
16a53ecc N |
2809 | break; |
2810 | case ALGORITHM_RIGHT_SYMMETRIC: | |
6e3b96ed | 2811 | pd_idx = sector_div(stripe2, raid_disks); |
911d4ee8 N |
2812 | qd_idx = (pd_idx + 1) % raid_disks; |
2813 | *dd_idx = (pd_idx + 2 + *dd_idx) % raid_disks; | |
16a53ecc | 2814 | break; |
99c0fb5f N |
2815 | |
2816 | case ALGORITHM_PARITY_0: | |
2817 | pd_idx = 0; | |
2818 | qd_idx = 1; | |
2819 | (*dd_idx) += 2; | |
2820 | break; | |
2821 | case ALGORITHM_PARITY_N: | |
2822 | pd_idx = data_disks; | |
2823 | qd_idx = data_disks + 1; | |
2824 | break; | |
2825 | ||
2826 | case ALGORITHM_ROTATING_ZERO_RESTART: | |
2827 | /* Exactly the same as RIGHT_ASYMMETRIC, but or | |
2828 | * of blocks for computing Q is different. | |
2829 | */ | |
6e3b96ed | 2830 | pd_idx = sector_div(stripe2, raid_disks); |
99c0fb5f N |
2831 | qd_idx = pd_idx + 1; |
2832 | if (pd_idx == raid_disks-1) { | |
2833 | (*dd_idx)++; /* Q D D D P */ | |
2834 | qd_idx = 0; | |
2835 | } else if (*dd_idx >= pd_idx) | |
2836 | (*dd_idx) += 2; /* D D P Q D */ | |
67cc2b81 | 2837 | ddf_layout = 1; |
99c0fb5f N |
2838 | break; |
2839 | ||
2840 | case ALGORITHM_ROTATING_N_RESTART: | |
2841 | /* Same a left_asymmetric, by first stripe is | |
2842 | * D D D P Q rather than | |
2843 | * Q D D D P | |
2844 | */ | |
6e3b96ed N |
2845 | stripe2 += 1; |
2846 | pd_idx = raid_disks - 1 - sector_div(stripe2, raid_disks); | |
99c0fb5f N |
2847 | qd_idx = pd_idx + 1; |
2848 | if (pd_idx == raid_disks-1) { | |
2849 | (*dd_idx)++; /* Q D D D P */ | |
2850 | qd_idx = 0; | |
2851 | } else if (*dd_idx >= pd_idx) | |
2852 | (*dd_idx) += 2; /* D D P Q D */ | |
67cc2b81 | 2853 | ddf_layout = 1; |
99c0fb5f N |
2854 | break; |
2855 | ||
2856 | case ALGORITHM_ROTATING_N_CONTINUE: | |
2857 | /* Same as left_symmetric but Q is before P */ | |
6e3b96ed | 2858 | pd_idx = raid_disks - 1 - sector_div(stripe2, raid_disks); |
99c0fb5f N |
2859 | qd_idx = (pd_idx + raid_disks - 1) % raid_disks; |
2860 | *dd_idx = (pd_idx + 1 + *dd_idx) % raid_disks; | |
67cc2b81 | 2861 | ddf_layout = 1; |
99c0fb5f N |
2862 | break; |
2863 | ||
2864 | case ALGORITHM_LEFT_ASYMMETRIC_6: | |
2865 | /* RAID5 left_asymmetric, with Q on last device */ | |
6e3b96ed | 2866 | pd_idx = data_disks - sector_div(stripe2, raid_disks-1); |
99c0fb5f N |
2867 | if (*dd_idx >= pd_idx) |
2868 | (*dd_idx)++; | |
2869 | qd_idx = raid_disks - 1; | |
2870 | break; | |
2871 | ||
2872 | case ALGORITHM_RIGHT_ASYMMETRIC_6: | |
6e3b96ed | 2873 | pd_idx = sector_div(stripe2, raid_disks-1); |
99c0fb5f N |
2874 | if (*dd_idx >= pd_idx) |
2875 | (*dd_idx)++; | |
2876 | qd_idx = raid_disks - 1; | |
2877 | break; | |
2878 | ||
2879 | case ALGORITHM_LEFT_SYMMETRIC_6: | |
6e3b96ed | 2880 | pd_idx = data_disks - sector_div(stripe2, raid_disks-1); |
99c0fb5f N |
2881 | *dd_idx = (pd_idx + 1 + *dd_idx) % (raid_disks-1); |
2882 | qd_idx = raid_disks - 1; | |
2883 | break; | |
2884 | ||
2885 | case ALGORITHM_RIGHT_SYMMETRIC_6: | |
6e3b96ed | 2886 | pd_idx = sector_div(stripe2, raid_disks-1); |
99c0fb5f N |
2887 | *dd_idx = (pd_idx + 1 + *dd_idx) % (raid_disks-1); |
2888 | qd_idx = raid_disks - 1; | |
2889 | break; | |
2890 | ||
2891 | case ALGORITHM_PARITY_0_6: | |
2892 | pd_idx = 0; | |
2893 | (*dd_idx)++; | |
2894 | qd_idx = raid_disks - 1; | |
2895 | break; | |
2896 | ||
16a53ecc | 2897 | default: |
99c0fb5f | 2898 | BUG(); |
16a53ecc N |
2899 | } |
2900 | break; | |
1da177e4 LT |
2901 | } |
2902 | ||
911d4ee8 N |
2903 | if (sh) { |
2904 | sh->pd_idx = pd_idx; | |
2905 | sh->qd_idx = qd_idx; | |
67cc2b81 | 2906 | sh->ddf_layout = ddf_layout; |
911d4ee8 | 2907 | } |
1da177e4 LT |
2908 | /* |
2909 | * Finally, compute the new sector number | |
2910 | */ | |
2911 | new_sector = (sector_t)stripe * sectors_per_chunk + chunk_offset; | |
2912 | return new_sector; | |
2913 | } | |
2914 | ||
6d036f7d | 2915 | sector_t raid5_compute_blocknr(struct stripe_head *sh, int i, int previous) |
1da177e4 | 2916 | { |
d1688a6d | 2917 | struct r5conf *conf = sh->raid_conf; |
b875e531 N |
2918 | int raid_disks = sh->disks; |
2919 | int data_disks = raid_disks - conf->max_degraded; | |
1da177e4 | 2920 | sector_t new_sector = sh->sector, check; |
09c9e5fa AN |
2921 | int sectors_per_chunk = previous ? conf->prev_chunk_sectors |
2922 | : conf->chunk_sectors; | |
e183eaed N |
2923 | int algorithm = previous ? conf->prev_algo |
2924 | : conf->algorithm; | |
1da177e4 LT |
2925 | sector_t stripe; |
2926 | int chunk_offset; | |
35f2a591 N |
2927 | sector_t chunk_number; |
2928 | int dummy1, dd_idx = i; | |
1da177e4 | 2929 | sector_t r_sector; |
911d4ee8 | 2930 | struct stripe_head sh2; |
1da177e4 LT |
2931 | |
2932 | chunk_offset = sector_div(new_sector, sectors_per_chunk); | |
2933 | stripe = new_sector; | |
1da177e4 | 2934 | |
16a53ecc N |
2935 | if (i == sh->pd_idx) |
2936 | return 0; | |
2937 | switch(conf->level) { | |
2938 | case 4: break; | |
2939 | case 5: | |
e183eaed | 2940 | switch (algorithm) { |
1da177e4 LT |
2941 | case ALGORITHM_LEFT_ASYMMETRIC: |
2942 | case ALGORITHM_RIGHT_ASYMMETRIC: | |
2943 | if (i > sh->pd_idx) | |
2944 | i--; | |
2945 | break; | |
2946 | case ALGORITHM_LEFT_SYMMETRIC: | |
2947 | case ALGORITHM_RIGHT_SYMMETRIC: | |
2948 | if (i < sh->pd_idx) | |
2949 | i += raid_disks; | |
2950 | i -= (sh->pd_idx + 1); | |
2951 | break; | |
99c0fb5f N |
2952 | case ALGORITHM_PARITY_0: |
2953 | i -= 1; | |
2954 | break; | |
2955 | case ALGORITHM_PARITY_N: | |
2956 | break; | |
1da177e4 | 2957 | default: |
99c0fb5f | 2958 | BUG(); |
16a53ecc N |
2959 | } |
2960 | break; | |
2961 | case 6: | |
d0dabf7e | 2962 | if (i == sh->qd_idx) |
16a53ecc | 2963 | return 0; /* It is the Q disk */ |
e183eaed | 2964 | switch (algorithm) { |
16a53ecc N |
2965 | case ALGORITHM_LEFT_ASYMMETRIC: |
2966 | case ALGORITHM_RIGHT_ASYMMETRIC: | |
99c0fb5f N |
2967 | case ALGORITHM_ROTATING_ZERO_RESTART: |
2968 | case ALGORITHM_ROTATING_N_RESTART: | |
2969 | if (sh->pd_idx == raid_disks-1) | |
2970 | i--; /* Q D D D P */ | |
16a53ecc N |
2971 | else if (i > sh->pd_idx) |
2972 | i -= 2; /* D D P Q D */ | |
2973 | break; | |
2974 | case ALGORITHM_LEFT_SYMMETRIC: | |
2975 | case ALGORITHM_RIGHT_SYMMETRIC: | |
2976 | if (sh->pd_idx == raid_disks-1) | |
2977 | i--; /* Q D D D P */ | |
2978 | else { | |
2979 | /* D D P Q D */ | |
2980 | if (i < sh->pd_idx) | |
2981 | i += raid_disks; | |
2982 | i -= (sh->pd_idx + 2); | |
2983 | } | |
2984 | break; | |
99c0fb5f N |
2985 | case ALGORITHM_PARITY_0: |
2986 | i -= 2; | |
2987 | break; | |
2988 | case ALGORITHM_PARITY_N: | |
2989 | break; | |
2990 | case ALGORITHM_ROTATING_N_CONTINUE: | |
e4424fee | 2991 | /* Like left_symmetric, but P is before Q */ |
99c0fb5f N |
2992 | if (sh->pd_idx == 0) |
2993 | i--; /* P D D D Q */ | |
e4424fee N |
2994 | else { |
2995 | /* D D Q P D */ | |
2996 | if (i < sh->pd_idx) | |
2997 | i += raid_disks; | |
2998 | i -= (sh->pd_idx + 1); | |
2999 | } | |
99c0fb5f N |
3000 | break; |
3001 | case ALGORITHM_LEFT_ASYMMETRIC_6: | |
3002 | case ALGORITHM_RIGHT_ASYMMETRIC_6: | |
3003 | if (i > sh->pd_idx) | |
3004 | i--; | |
3005 | break; | |
3006 | case ALGORITHM_LEFT_SYMMETRIC_6: | |
3007 | case ALGORITHM_RIGHT_SYMMETRIC_6: | |
3008 | if (i < sh->pd_idx) | |
3009 | i += data_disks + 1; | |
3010 | i -= (sh->pd_idx + 1); | |
3011 | break; | |
3012 | case ALGORITHM_PARITY_0_6: | |
3013 | i -= 1; | |
3014 | break; | |
16a53ecc | 3015 | default: |
99c0fb5f | 3016 | BUG(); |
16a53ecc N |
3017 | } |
3018 | break; | |
1da177e4 LT |
3019 | } |
3020 | ||
3021 | chunk_number = stripe * data_disks + i; | |
35f2a591 | 3022 | r_sector = chunk_number * sectors_per_chunk + chunk_offset; |
1da177e4 | 3023 | |
112bf897 | 3024 | check = raid5_compute_sector(conf, r_sector, |
784052ec | 3025 | previous, &dummy1, &sh2); |
911d4ee8 N |
3026 | if (check != sh->sector || dummy1 != dd_idx || sh2.pd_idx != sh->pd_idx |
3027 | || sh2.qd_idx != sh->qd_idx) { | |
cc6167b4 N |
3028 | pr_warn("md/raid:%s: compute_blocknr: map not correct\n", |
3029 | mdname(conf->mddev)); | |
1da177e4 LT |
3030 | return 0; |
3031 | } | |
3032 | return r_sector; | |
3033 | } | |
3034 | ||
07e83364 SL |
3035 | /* |
3036 | * There are cases where we want handle_stripe_dirtying() and | |
3037 | * schedule_reconstruction() to delay towrite to some dev of a stripe. | |
3038 | * | |
3039 | * This function checks whether we want to delay the towrite. Specifically, | |
3040 | * we delay the towrite when: | |
3041 | * | |
3042 | * 1. degraded stripe has a non-overwrite to the missing dev, AND this | |
3043 | * stripe has data in journal (for other devices). | |
3044 | * | |
3045 | * In this case, when reading data for the non-overwrite dev, it is | |
3046 | * necessary to handle complex rmw of write back cache (prexor with | |
3047 | * orig_page, and xor with page). To keep read path simple, we would | |
3048 | * like to flush data in journal to RAID disks first, so complex rmw | |
3049 | * is handled in the write patch (handle_stripe_dirtying). | |
3050 | * | |
39b99586 SL |
3051 | * 2. when journal space is critical (R5C_LOG_CRITICAL=1) |
3052 | * | |
3053 | * It is important to be able to flush all stripes in raid5-cache. | |
3054 | * Therefore, we need reserve some space on the journal device for | |
3055 | * these flushes. If flush operation includes pending writes to the | |
3056 | * stripe, we need to reserve (conf->raid_disk + 1) pages per stripe | |
3057 | * for the flush out. If we exclude these pending writes from flush | |
3058 | * operation, we only need (conf->max_degraded + 1) pages per stripe. | |
3059 | * Therefore, excluding pending writes in these cases enables more | |
3060 | * efficient use of the journal device. | |
3061 | * | |
3062 | * Note: To make sure the stripe makes progress, we only delay | |
3063 | * towrite for stripes with data already in journal (injournal > 0). | |
3064 | * When LOG_CRITICAL, stripes with injournal == 0 will be sent to | |
3065 | * no_space_stripes list. | |
3066 | * | |
70d466f7 SL |
3067 | * 3. during journal failure |
3068 | * In journal failure, we try to flush all cached data to raid disks | |
3069 | * based on data in stripe cache. The array is read-only to upper | |
3070 | * layers, so we would skip all pending writes. | |
3071 | * | |
07e83364 | 3072 | */ |
39b99586 SL |
3073 | static inline bool delay_towrite(struct r5conf *conf, |
3074 | struct r5dev *dev, | |
3075 | struct stripe_head_state *s) | |
07e83364 | 3076 | { |
39b99586 SL |
3077 | /* case 1 above */ |
3078 | if (!test_bit(R5_OVERWRITE, &dev->flags) && | |
3079 | !test_bit(R5_Insync, &dev->flags) && s->injournal) | |
3080 | return true; | |
3081 | /* case 2 above */ | |
3082 | if (test_bit(R5C_LOG_CRITICAL, &conf->cache_state) && | |
3083 | s->injournal > 0) | |
3084 | return true; | |
70d466f7 SL |
3085 | /* case 3 above */ |
3086 | if (s->log_failed && s->injournal) | |
3087 | return true; | |
39b99586 | 3088 | return false; |
07e83364 SL |
3089 | } |
3090 | ||
600aa109 | 3091 | static void |
c0f7bddb | 3092 | schedule_reconstruction(struct stripe_head *sh, struct stripe_head_state *s, |
600aa109 | 3093 | int rcw, int expand) |
e33129d8 | 3094 | { |
584acdd4 | 3095 | int i, pd_idx = sh->pd_idx, qd_idx = sh->qd_idx, disks = sh->disks; |
d1688a6d | 3096 | struct r5conf *conf = sh->raid_conf; |
c0f7bddb | 3097 | int level = conf->level; |
e33129d8 DW |
3098 | |
3099 | if (rcw) { | |
1e6d690b SL |
3100 | /* |
3101 | * In some cases, handle_stripe_dirtying initially decided to | |
3102 | * run rmw and allocates extra page for prexor. However, rcw is | |
3103 | * cheaper later on. We need to free the extra page now, | |
3104 | * because we won't be able to do that in ops_complete_prexor(). | |
3105 | */ | |
3106 | r5c_release_extra_page(sh); | |
e33129d8 DW |
3107 | |
3108 | for (i = disks; i--; ) { | |
3109 | struct r5dev *dev = &sh->dev[i]; | |
3110 | ||
39b99586 | 3111 | if (dev->towrite && !delay_towrite(conf, dev, s)) { |
e33129d8 | 3112 | set_bit(R5_LOCKED, &dev->flags); |
d8ee0728 | 3113 | set_bit(R5_Wantdrain, &dev->flags); |
e33129d8 DW |
3114 | if (!expand) |
3115 | clear_bit(R5_UPTODATE, &dev->flags); | |
600aa109 | 3116 | s->locked++; |
1e6d690b SL |
3117 | } else if (test_bit(R5_InJournal, &dev->flags)) { |
3118 | set_bit(R5_LOCKED, &dev->flags); | |
3119 | s->locked++; | |
e33129d8 DW |
3120 | } |
3121 | } | |
ce7d363a N |
3122 | /* if we are not expanding this is a proper write request, and |
3123 | * there will be bios with new data to be drained into the | |
3124 | * stripe cache | |
3125 | */ | |
3126 | if (!expand) { | |
3127 | if (!s->locked) | |
3128 | /* False alarm, nothing to do */ | |
3129 | return; | |
3130 | sh->reconstruct_state = reconstruct_state_drain_run; | |
3131 | set_bit(STRIPE_OP_BIODRAIN, &s->ops_request); | |
3132 | } else | |
3133 | sh->reconstruct_state = reconstruct_state_run; | |
3134 | ||
3135 | set_bit(STRIPE_OP_RECONSTRUCT, &s->ops_request); | |
3136 | ||
c0f7bddb | 3137 | if (s->locked + conf->max_degraded == disks) |
8b3e6cdc | 3138 | if (!test_and_set_bit(STRIPE_FULL_WRITE, &sh->state)) |
c0f7bddb | 3139 | atomic_inc(&conf->pending_full_writes); |
e33129d8 DW |
3140 | } else { |
3141 | BUG_ON(!(test_bit(R5_UPTODATE, &sh->dev[pd_idx].flags) || | |
3142 | test_bit(R5_Wantcompute, &sh->dev[pd_idx].flags))); | |
584acdd4 MS |
3143 | BUG_ON(level == 6 && |
3144 | (!(test_bit(R5_UPTODATE, &sh->dev[qd_idx].flags) || | |
3145 | test_bit(R5_Wantcompute, &sh->dev[qd_idx].flags)))); | |
e33129d8 | 3146 | |
e33129d8 DW |
3147 | for (i = disks; i--; ) { |
3148 | struct r5dev *dev = &sh->dev[i]; | |
584acdd4 | 3149 | if (i == pd_idx || i == qd_idx) |
e33129d8 DW |
3150 | continue; |
3151 | ||
e33129d8 DW |
3152 | if (dev->towrite && |
3153 | (test_bit(R5_UPTODATE, &dev->flags) || | |
d8ee0728 DW |
3154 | test_bit(R5_Wantcompute, &dev->flags))) { |
3155 | set_bit(R5_Wantdrain, &dev->flags); | |
e33129d8 DW |
3156 | set_bit(R5_LOCKED, &dev->flags); |
3157 | clear_bit(R5_UPTODATE, &dev->flags); | |
600aa109 | 3158 | s->locked++; |
1e6d690b SL |
3159 | } else if (test_bit(R5_InJournal, &dev->flags)) { |
3160 | set_bit(R5_LOCKED, &dev->flags); | |
3161 | s->locked++; | |
e33129d8 DW |
3162 | } |
3163 | } | |
ce7d363a N |
3164 | if (!s->locked) |
3165 | /* False alarm - nothing to do */ | |
3166 | return; | |
3167 | sh->reconstruct_state = reconstruct_state_prexor_drain_run; | |
3168 | set_bit(STRIPE_OP_PREXOR, &s->ops_request); | |
3169 | set_bit(STRIPE_OP_BIODRAIN, &s->ops_request); | |
3170 | set_bit(STRIPE_OP_RECONSTRUCT, &s->ops_request); | |
e33129d8 DW |
3171 | } |
3172 | ||
c0f7bddb | 3173 | /* keep the parity disk(s) locked while asynchronous operations |
e33129d8 DW |
3174 | * are in flight |
3175 | */ | |
3176 | set_bit(R5_LOCKED, &sh->dev[pd_idx].flags); | |
3177 | clear_bit(R5_UPTODATE, &sh->dev[pd_idx].flags); | |
600aa109 | 3178 | s->locked++; |
e33129d8 | 3179 | |
c0f7bddb YT |
3180 | if (level == 6) { |
3181 | int qd_idx = sh->qd_idx; | |
3182 | struct r5dev *dev = &sh->dev[qd_idx]; | |
3183 | ||
3184 | set_bit(R5_LOCKED, &dev->flags); | |
3185 | clear_bit(R5_UPTODATE, &dev->flags); | |
3186 | s->locked++; | |
3187 | } | |
3188 | ||
845b9e22 | 3189 | if (raid5_has_ppl(sh->raid_conf) && sh->ppl_page && |
3418d036 AP |
3190 | test_bit(STRIPE_OP_BIODRAIN, &s->ops_request) && |
3191 | !test_bit(STRIPE_FULL_WRITE, &sh->state) && | |
3192 | test_bit(R5_Insync, &sh->dev[pd_idx].flags)) | |
3193 | set_bit(STRIPE_OP_PARTIAL_PARITY, &s->ops_request); | |
3194 | ||
600aa109 | 3195 | pr_debug("%s: stripe %llu locked: %d ops_request: %lx\n", |
e46b272b | 3196 | __func__, (unsigned long long)sh->sector, |
600aa109 | 3197 | s->locked, s->ops_request); |
e33129d8 | 3198 | } |
16a53ecc | 3199 | |
1da177e4 LT |
3200 | /* |
3201 | * Each stripe/dev can have one or more bion attached. | |
16a53ecc | 3202 | * toread/towrite point to the first in a chain. |
1da177e4 LT |
3203 | * The bi_next chain must be in order. |
3204 | */ | |
da41ba65 | 3205 | static int add_stripe_bio(struct stripe_head *sh, struct bio *bi, int dd_idx, |
3206 | int forwrite, int previous) | |
1da177e4 LT |
3207 | { |
3208 | struct bio **bip; | |
d1688a6d | 3209 | struct r5conf *conf = sh->raid_conf; |
72626685 | 3210 | int firstwrite=0; |
1da177e4 | 3211 | |
cbe47ec5 | 3212 | pr_debug("adding bi b#%llu to stripe s#%llu\n", |
4f024f37 | 3213 | (unsigned long long)bi->bi_iter.bi_sector, |
1da177e4 LT |
3214 | (unsigned long long)sh->sector); |
3215 | ||
b17459c0 | 3216 | spin_lock_irq(&sh->stripe_lock); |
2cd259a7 | 3217 | sh->dev[dd_idx].write_hint = bi->bi_write_hint; |
59fc630b | 3218 | /* Don't allow new IO added to stripes in batch list */ |
3219 | if (sh->batch_head) | |
3220 | goto overlap; | |
72626685 | 3221 | if (forwrite) { |
1da177e4 | 3222 | bip = &sh->dev[dd_idx].towrite; |
7eaf7e8e | 3223 | if (*bip == NULL) |
72626685 N |
3224 | firstwrite = 1; |
3225 | } else | |
1da177e4 | 3226 | bip = &sh->dev[dd_idx].toread; |
4f024f37 KO |
3227 | while (*bip && (*bip)->bi_iter.bi_sector < bi->bi_iter.bi_sector) { |
3228 | if (bio_end_sector(*bip) > bi->bi_iter.bi_sector) | |
1da177e4 LT |
3229 | goto overlap; |
3230 | bip = & (*bip)->bi_next; | |
3231 | } | |
4f024f37 | 3232 | if (*bip && (*bip)->bi_iter.bi_sector < bio_end_sector(bi)) |
1da177e4 LT |
3233 | goto overlap; |
3234 | ||
3418d036 AP |
3235 | if (forwrite && raid5_has_ppl(conf)) { |
3236 | /* | |
3237 | * With PPL only writes to consecutive data chunks within a | |
3238 | * stripe are allowed because for a single stripe_head we can | |
3239 | * only have one PPL entry at a time, which describes one data | |
3240 | * range. Not really an overlap, but wait_for_overlap can be | |
3241 | * used to handle this. | |
3242 | */ | |
3243 | sector_t sector; | |
3244 | sector_t first = 0; | |
3245 | sector_t last = 0; | |
3246 | int count = 0; | |
3247 | int i; | |
3248 | ||
3249 | for (i = 0; i < sh->disks; i++) { | |
3250 | if (i != sh->pd_idx && | |
3251 | (i == dd_idx || sh->dev[i].towrite)) { | |
3252 | sector = sh->dev[i].sector; | |
3253 | if (count == 0 || sector < first) | |
3254 | first = sector; | |
3255 | if (sector > last) | |
3256 | last = sector; | |
3257 | count++; | |
3258 | } | |
3259 | } | |
3260 | ||
3261 | if (first + conf->chunk_sectors * (count - 1) != last) | |
3262 | goto overlap; | |
3263 | } | |
3264 | ||
da41ba65 | 3265 | if (!forwrite || previous) |
3266 | clear_bit(STRIPE_BATCH_READY, &sh->state); | |
3267 | ||
78bafebd | 3268 | BUG_ON(*bip && bi->bi_next && (*bip) != bi->bi_next); |
1da177e4 LT |
3269 | if (*bip) |
3270 | bi->bi_next = *bip; | |
3271 | *bip = bi; | |
016c76ac | 3272 | bio_inc_remaining(bi); |
49728050 | 3273 | md_write_inc(conf->mddev, bi); |
72626685 | 3274 | |
1da177e4 LT |
3275 | if (forwrite) { |
3276 | /* check if page is covered */ | |
3277 | sector_t sector = sh->dev[dd_idx].sector; | |
3278 | for (bi=sh->dev[dd_idx].towrite; | |
3279 | sector < sh->dev[dd_idx].sector + STRIPE_SECTORS && | |
4f024f37 | 3280 | bi && bi->bi_iter.bi_sector <= sector; |
1da177e4 | 3281 | bi = r5_next_bio(bi, sh->dev[dd_idx].sector)) { |
f73a1c7d KO |
3282 | if (bio_end_sector(bi) >= sector) |
3283 | sector = bio_end_sector(bi); | |
1da177e4 LT |
3284 | } |
3285 | if (sector >= sh->dev[dd_idx].sector + STRIPE_SECTORS) | |
7a87f434 | 3286 | if (!test_and_set_bit(R5_OVERWRITE, &sh->dev[dd_idx].flags)) |
3287 | sh->overwrite_disks++; | |
1da177e4 | 3288 | } |
cbe47ec5 N |
3289 | |
3290 | pr_debug("added bi b#%llu to stripe s#%llu, disk %d.\n", | |
4f024f37 | 3291 | (unsigned long long)(*bip)->bi_iter.bi_sector, |
cbe47ec5 N |
3292 | (unsigned long long)sh->sector, dd_idx); |
3293 | ||
3294 | if (conf->mddev->bitmap && firstwrite) { | |
d0852df5 N |
3295 | /* Cannot hold spinlock over bitmap_startwrite, |
3296 | * but must ensure this isn't added to a batch until | |
3297 | * we have added to the bitmap and set bm_seq. | |
3298 | * So set STRIPE_BITMAP_PENDING to prevent | |
3299 | * batching. | |
3300 | * If multiple add_stripe_bio() calls race here they | |
3301 | * much all set STRIPE_BITMAP_PENDING. So only the first one | |
3302 | * to complete "bitmap_startwrite" gets to set | |
3303 | * STRIPE_BIT_DELAY. This is important as once a stripe | |
3304 | * is added to a batch, STRIPE_BIT_DELAY cannot be changed | |
3305 | * any more. | |
3306 | */ | |
3307 | set_bit(STRIPE_BITMAP_PENDING, &sh->state); | |
3308 | spin_unlock_irq(&sh->stripe_lock); | |
e64e4018 AS |
3309 | md_bitmap_startwrite(conf->mddev->bitmap, sh->sector, |
3310 | STRIPE_SECTORS, 0); | |
d0852df5 N |
3311 | spin_lock_irq(&sh->stripe_lock); |
3312 | clear_bit(STRIPE_BITMAP_PENDING, &sh->state); | |
3313 | if (!sh->batch_head) { | |
3314 | sh->bm_seq = conf->seq_flush+1; | |
3315 | set_bit(STRIPE_BIT_DELAY, &sh->state); | |
3316 | } | |
cbe47ec5 | 3317 | } |
d0852df5 | 3318 | spin_unlock_irq(&sh->stripe_lock); |
59fc630b | 3319 | |
3320 | if (stripe_can_batch(sh)) | |
3321 | stripe_add_to_batch_list(conf, sh); | |
1da177e4 LT |
3322 | return 1; |
3323 | ||
3324 | overlap: | |
3325 | set_bit(R5_Overlap, &sh->dev[dd_idx].flags); | |
b17459c0 | 3326 | spin_unlock_irq(&sh->stripe_lock); |
1da177e4 LT |
3327 | return 0; |
3328 | } | |
3329 | ||
d1688a6d | 3330 | static void end_reshape(struct r5conf *conf); |
29269553 | 3331 | |
d1688a6d | 3332 | static void stripe_set_idx(sector_t stripe, struct r5conf *conf, int previous, |
911d4ee8 | 3333 | struct stripe_head *sh) |
ccfcc3c1 | 3334 | { |
784052ec | 3335 | int sectors_per_chunk = |
09c9e5fa | 3336 | previous ? conf->prev_chunk_sectors : conf->chunk_sectors; |
911d4ee8 | 3337 | int dd_idx; |
2d2063ce | 3338 | int chunk_offset = sector_div(stripe, sectors_per_chunk); |
112bf897 | 3339 | int disks = previous ? conf->previous_raid_disks : conf->raid_disks; |
2d2063ce | 3340 | |
112bf897 N |
3341 | raid5_compute_sector(conf, |
3342 | stripe * (disks - conf->max_degraded) | |
b875e531 | 3343 | *sectors_per_chunk + chunk_offset, |
112bf897 | 3344 | previous, |
911d4ee8 | 3345 | &dd_idx, sh); |
ccfcc3c1 N |
3346 | } |
3347 | ||
a4456856 | 3348 | static void |
d1688a6d | 3349 | handle_failed_stripe(struct r5conf *conf, struct stripe_head *sh, |
bd83d0a2 | 3350 | struct stripe_head_state *s, int disks) |
a4456856 DW |
3351 | { |
3352 | int i; | |
59fc630b | 3353 | BUG_ON(sh->batch_head); |
a4456856 DW |
3354 | for (i = disks; i--; ) { |
3355 | struct bio *bi; | |
3356 | int bitmap_end = 0; | |
3357 | ||
3358 | if (test_bit(R5_ReadError, &sh->dev[i].flags)) { | |
3cb03002 | 3359 | struct md_rdev *rdev; |
a4456856 DW |
3360 | rcu_read_lock(); |
3361 | rdev = rcu_dereference(conf->disks[i].rdev); | |
f5b67ae8 N |
3362 | if (rdev && test_bit(In_sync, &rdev->flags) && |
3363 | !test_bit(Faulty, &rdev->flags)) | |
7f0da59b N |
3364 | atomic_inc(&rdev->nr_pending); |
3365 | else | |
3366 | rdev = NULL; | |
a4456856 | 3367 | rcu_read_unlock(); |
7f0da59b N |
3368 | if (rdev) { |
3369 | if (!rdev_set_badblocks( | |
3370 | rdev, | |
3371 | sh->sector, | |
3372 | STRIPE_SECTORS, 0)) | |
3373 | md_error(conf->mddev, rdev); | |
3374 | rdev_dec_pending(rdev, conf->mddev); | |
3375 | } | |
a4456856 | 3376 | } |
b17459c0 | 3377 | spin_lock_irq(&sh->stripe_lock); |
a4456856 DW |
3378 | /* fail all writes first */ |
3379 | bi = sh->dev[i].towrite; | |
3380 | sh->dev[i].towrite = NULL; | |
7a87f434 | 3381 | sh->overwrite_disks = 0; |
b17459c0 | 3382 | spin_unlock_irq(&sh->stripe_lock); |
1ed850f3 | 3383 | if (bi) |
a4456856 | 3384 | bitmap_end = 1; |
a4456856 | 3385 | |
ff875738 | 3386 | log_stripe_write_finished(sh); |
0576b1c6 | 3387 | |
a4456856 DW |
3388 | if (test_and_clear_bit(R5_Overlap, &sh->dev[i].flags)) |
3389 | wake_up(&conf->wait_for_overlap); | |
3390 | ||
4f024f37 | 3391 | while (bi && bi->bi_iter.bi_sector < |
a4456856 DW |
3392 | sh->dev[i].sector + STRIPE_SECTORS) { |
3393 | struct bio *nextbi = r5_next_bio(bi, sh->dev[i].sector); | |
4246a0b6 | 3394 | |
49728050 | 3395 | md_write_end(conf->mddev); |
6308d8e3 | 3396 | bio_io_error(bi); |
a4456856 DW |
3397 | bi = nextbi; |
3398 | } | |
7eaf7e8e | 3399 | if (bitmap_end) |
e64e4018 AS |
3400 | md_bitmap_endwrite(conf->mddev->bitmap, sh->sector, |
3401 | STRIPE_SECTORS, 0, 0); | |
7eaf7e8e | 3402 | bitmap_end = 0; |
a4456856 DW |
3403 | /* and fail all 'written' */ |
3404 | bi = sh->dev[i].written; | |
3405 | sh->dev[i].written = NULL; | |
d592a996 SL |
3406 | if (test_and_clear_bit(R5_SkipCopy, &sh->dev[i].flags)) { |
3407 | WARN_ON(test_bit(R5_UPTODATE, &sh->dev[i].flags)); | |
3408 | sh->dev[i].page = sh->dev[i].orig_page; | |
3409 | } | |
3410 | ||
a4456856 | 3411 | if (bi) bitmap_end = 1; |
4f024f37 | 3412 | while (bi && bi->bi_iter.bi_sector < |
a4456856 DW |
3413 | sh->dev[i].sector + STRIPE_SECTORS) { |
3414 | struct bio *bi2 = r5_next_bio(bi, sh->dev[i].sector); | |
4246a0b6 | 3415 | |
49728050 | 3416 | md_write_end(conf->mddev); |
6308d8e3 | 3417 | bio_io_error(bi); |
a4456856 DW |
3418 | bi = bi2; |
3419 | } | |
3420 | ||
b5e98d65 DW |
3421 | /* fail any reads if this device is non-operational and |
3422 | * the data has not reached the cache yet. | |
3423 | */ | |
3424 | if (!test_bit(R5_Wantfill, &sh->dev[i].flags) && | |
6e74a9cf | 3425 | s->failed > conf->max_degraded && |
b5e98d65 DW |
3426 | (!test_bit(R5_Insync, &sh->dev[i].flags) || |
3427 | test_bit(R5_ReadError, &sh->dev[i].flags))) { | |
143c4d05 | 3428 | spin_lock_irq(&sh->stripe_lock); |
a4456856 DW |
3429 | bi = sh->dev[i].toread; |
3430 | sh->dev[i].toread = NULL; | |
143c4d05 | 3431 | spin_unlock_irq(&sh->stripe_lock); |
a4456856 DW |
3432 | if (test_and_clear_bit(R5_Overlap, &sh->dev[i].flags)) |
3433 | wake_up(&conf->wait_for_overlap); | |
ebda780b SL |
3434 | if (bi) |
3435 | s->to_read--; | |
4f024f37 | 3436 | while (bi && bi->bi_iter.bi_sector < |
a4456856 DW |
3437 | sh->dev[i].sector + STRIPE_SECTORS) { |
3438 | struct bio *nextbi = | |
3439 | r5_next_bio(bi, sh->dev[i].sector); | |
4246a0b6 | 3440 | |
6308d8e3 | 3441 | bio_io_error(bi); |
a4456856 DW |
3442 | bi = nextbi; |
3443 | } | |
3444 | } | |
a4456856 | 3445 | if (bitmap_end) |
e64e4018 AS |
3446 | md_bitmap_endwrite(conf->mddev->bitmap, sh->sector, |
3447 | STRIPE_SECTORS, 0, 0); | |
8cfa7b0f N |
3448 | /* If we were in the middle of a write the parity block might |
3449 | * still be locked - so just clear all R5_LOCKED flags | |
3450 | */ | |
3451 | clear_bit(R5_LOCKED, &sh->dev[i].flags); | |
a4456856 | 3452 | } |
ebda780b SL |
3453 | s->to_write = 0; |
3454 | s->written = 0; | |
a4456856 | 3455 | |
8b3e6cdc DW |
3456 | if (test_and_clear_bit(STRIPE_FULL_WRITE, &sh->state)) |
3457 | if (atomic_dec_and_test(&conf->pending_full_writes)) | |
3458 | md_wakeup_thread(conf->mddev->thread); | |
a4456856 DW |
3459 | } |
3460 | ||
7f0da59b | 3461 | static void |
d1688a6d | 3462 | handle_failed_sync(struct r5conf *conf, struct stripe_head *sh, |
7f0da59b N |
3463 | struct stripe_head_state *s) |
3464 | { | |
3465 | int abort = 0; | |
3466 | int i; | |
3467 | ||
59fc630b | 3468 | BUG_ON(sh->batch_head); |
7f0da59b | 3469 | clear_bit(STRIPE_SYNCING, &sh->state); |
f8dfcffd N |
3470 | if (test_and_clear_bit(R5_Overlap, &sh->dev[sh->pd_idx].flags)) |
3471 | wake_up(&conf->wait_for_overlap); | |
7f0da59b | 3472 | s->syncing = 0; |
9a3e1101 | 3473 | s->replacing = 0; |
7f0da59b | 3474 | /* There is nothing more to do for sync/check/repair. |
18b9837e N |
3475 | * Don't even need to abort as that is handled elsewhere |
3476 | * if needed, and not always wanted e.g. if there is a known | |
3477 | * bad block here. | |
9a3e1101 | 3478 | * For recover/replace we need to record a bad block on all |
7f0da59b N |
3479 | * non-sync devices, or abort the recovery |
3480 | */ | |
18b9837e N |
3481 | if (test_bit(MD_RECOVERY_RECOVER, &conf->mddev->recovery)) { |
3482 | /* During recovery devices cannot be removed, so | |
3483 | * locking and refcounting of rdevs is not needed | |
3484 | */ | |
e50d3992 | 3485 | rcu_read_lock(); |
18b9837e | 3486 | for (i = 0; i < conf->raid_disks; i++) { |
e50d3992 | 3487 | struct md_rdev *rdev = rcu_dereference(conf->disks[i].rdev); |
18b9837e N |
3488 | if (rdev |
3489 | && !test_bit(Faulty, &rdev->flags) | |
3490 | && !test_bit(In_sync, &rdev->flags) | |
3491 | && !rdev_set_badblocks(rdev, sh->sector, | |
3492 | STRIPE_SECTORS, 0)) | |
3493 | abort = 1; | |
e50d3992 | 3494 | rdev = rcu_dereference(conf->disks[i].replacement); |
18b9837e N |
3495 | if (rdev |
3496 | && !test_bit(Faulty, &rdev->flags) | |
3497 | && !test_bit(In_sync, &rdev->flags) | |
3498 | && !rdev_set_badblocks(rdev, sh->sector, | |
3499 | STRIPE_SECTORS, 0)) | |
3500 | abort = 1; | |
3501 | } | |
e50d3992 | 3502 | rcu_read_unlock(); |
18b9837e N |
3503 | if (abort) |
3504 | conf->recovery_disabled = | |
3505 | conf->mddev->recovery_disabled; | |
7f0da59b | 3506 | } |
18b9837e | 3507 | md_done_sync(conf->mddev, STRIPE_SECTORS, !abort); |
7f0da59b N |
3508 | } |
3509 | ||
9a3e1101 N |
3510 | static int want_replace(struct stripe_head *sh, int disk_idx) |
3511 | { | |
3512 | struct md_rdev *rdev; | |
3513 | int rv = 0; | |
3f232d6a N |
3514 | |
3515 | rcu_read_lock(); | |
3516 | rdev = rcu_dereference(sh->raid_conf->disks[disk_idx].replacement); | |
9a3e1101 N |
3517 | if (rdev |
3518 | && !test_bit(Faulty, &rdev->flags) | |
3519 | && !test_bit(In_sync, &rdev->flags) | |
3520 | && (rdev->recovery_offset <= sh->sector | |
3521 | || rdev->mddev->recovery_cp <= sh->sector)) | |
3522 | rv = 1; | |
3f232d6a | 3523 | rcu_read_unlock(); |
9a3e1101 N |
3524 | return rv; |
3525 | } | |
3526 | ||
2c58f06e N |
3527 | static int need_this_block(struct stripe_head *sh, struct stripe_head_state *s, |
3528 | int disk_idx, int disks) | |
a4456856 | 3529 | { |
5599becc | 3530 | struct r5dev *dev = &sh->dev[disk_idx]; |
f2b3b44d N |
3531 | struct r5dev *fdev[2] = { &sh->dev[s->failed_num[0]], |
3532 | &sh->dev[s->failed_num[1]] }; | |
ea664c82 | 3533 | int i; |
5599becc | 3534 | |
a79cfe12 N |
3535 | |
3536 | if (test_bit(R5_LOCKED, &dev->flags) || | |
3537 | test_bit(R5_UPTODATE, &dev->flags)) | |
3538 | /* No point reading this as we already have it or have | |
3539 | * decided to get it. | |
3540 | */ | |
3541 | return 0; | |
3542 | ||
3543 | if (dev->toread || | |
3544 | (dev->towrite && !test_bit(R5_OVERWRITE, &dev->flags))) | |
3545 | /* We need this block to directly satisfy a request */ | |
3546 | return 1; | |
3547 | ||
3548 | if (s->syncing || s->expanding || | |
3549 | (s->replacing && want_replace(sh, disk_idx))) | |
3550 | /* When syncing, or expanding we read everything. | |
3551 | * When replacing, we need the replaced block. | |
3552 | */ | |
3553 | return 1; | |
3554 | ||
3555 | if ((s->failed >= 1 && fdev[0]->toread) || | |
3556 | (s->failed >= 2 && fdev[1]->toread)) | |
3557 | /* If we want to read from a failed device, then | |
3558 | * we need to actually read every other device. | |
3559 | */ | |
3560 | return 1; | |
3561 | ||
a9d56950 N |
3562 | /* Sometimes neither read-modify-write nor reconstruct-write |
3563 | * cycles can work. In those cases we read every block we | |
3564 | * can. Then the parity-update is certain to have enough to | |
3565 | * work with. | |
3566 | * This can only be a problem when we need to write something, | |
3567 | * and some device has failed. If either of those tests | |
3568 | * fail we need look no further. | |
3569 | */ | |
3570 | if (!s->failed || !s->to_write) | |
3571 | return 0; | |
3572 | ||
3573 | if (test_bit(R5_Insync, &dev->flags) && | |
3574 | !test_bit(STRIPE_PREREAD_ACTIVE, &sh->state)) | |
3575 | /* Pre-reads at not permitted until after short delay | |
3576 | * to gather multiple requests. However if this | |
3560741e | 3577 | * device is no Insync, the block could only be computed |
a9d56950 N |
3578 | * and there is no need to delay that. |
3579 | */ | |
3580 | return 0; | |
ea664c82 | 3581 | |
36707bb2 | 3582 | for (i = 0; i < s->failed && i < 2; i++) { |
ea664c82 N |
3583 | if (fdev[i]->towrite && |
3584 | !test_bit(R5_UPTODATE, &fdev[i]->flags) && | |
3585 | !test_bit(R5_OVERWRITE, &fdev[i]->flags)) | |
3586 | /* If we have a partial write to a failed | |
3587 | * device, then we will need to reconstruct | |
3588 | * the content of that device, so all other | |
3589 | * devices must be read. | |
3590 | */ | |
3591 | return 1; | |
3592 | } | |
3593 | ||
3594 | /* If we are forced to do a reconstruct-write, either because | |
3595 | * the current RAID6 implementation only supports that, or | |
3560741e | 3596 | * because parity cannot be trusted and we are currently |
ea664c82 N |
3597 | * recovering it, there is extra need to be careful. |
3598 | * If one of the devices that we would need to read, because | |
3599 | * it is not being overwritten (and maybe not written at all) | |
3600 | * is missing/faulty, then we need to read everything we can. | |
3601 | */ | |
3602 | if (sh->raid_conf->level != 6 && | |
3603 | sh->sector < sh->raid_conf->mddev->recovery_cp) | |
3604 | /* reconstruct-write isn't being forced */ | |
3605 | return 0; | |
36707bb2 | 3606 | for (i = 0; i < s->failed && i < 2; i++) { |
10d82c5f N |
3607 | if (s->failed_num[i] != sh->pd_idx && |
3608 | s->failed_num[i] != sh->qd_idx && | |
3609 | !test_bit(R5_UPTODATE, &fdev[i]->flags) && | |
ea664c82 N |
3610 | !test_bit(R5_OVERWRITE, &fdev[i]->flags)) |
3611 | return 1; | |
3612 | } | |
3613 | ||
2c58f06e N |
3614 | return 0; |
3615 | } | |
3616 | ||
ba02684d SL |
3617 | /* fetch_block - checks the given member device to see if its data needs |
3618 | * to be read or computed to satisfy a request. | |
3619 | * | |
3620 | * Returns 1 when no more member devices need to be checked, otherwise returns | |
3621 | * 0 to tell the loop in handle_stripe_fill to continue | |
3622 | */ | |
2c58f06e N |
3623 | static int fetch_block(struct stripe_head *sh, struct stripe_head_state *s, |
3624 | int disk_idx, int disks) | |
3625 | { | |
3626 | struct r5dev *dev = &sh->dev[disk_idx]; | |
3627 | ||
3628 | /* is the data in this block needed, and can we get it? */ | |
3629 | if (need_this_block(sh, s, disk_idx, disks)) { | |
5599becc YT |
3630 | /* we would like to get this block, possibly by computing it, |
3631 | * otherwise read it if the backing disk is insync | |
3632 | */ | |
3633 | BUG_ON(test_bit(R5_Wantcompute, &dev->flags)); | |
3634 | BUG_ON(test_bit(R5_Wantread, &dev->flags)); | |
b0c783b3 | 3635 | BUG_ON(sh->batch_head); |
7471fb77 N |
3636 | |
3637 | /* | |
3638 | * In the raid6 case if the only non-uptodate disk is P | |
3639 | * then we already trusted P to compute the other failed | |
3640 | * drives. It is safe to compute rather than re-read P. | |
3641 | * In other cases we only compute blocks from failed | |
3642 | * devices, otherwise check/repair might fail to detect | |
3643 | * a real inconsistency. | |
3644 | */ | |
3645 | ||
5599becc | 3646 | if ((s->uptodate == disks - 1) && |
7471fb77 | 3647 | ((sh->qd_idx >= 0 && sh->pd_idx == disk_idx) || |
f2b3b44d | 3648 | (s->failed && (disk_idx == s->failed_num[0] || |
7471fb77 | 3649 | disk_idx == s->failed_num[1])))) { |
5599becc YT |
3650 | /* have disk failed, and we're requested to fetch it; |
3651 | * do compute it | |
a4456856 | 3652 | */ |
5599becc YT |
3653 | pr_debug("Computing stripe %llu block %d\n", |
3654 | (unsigned long long)sh->sector, disk_idx); | |
3655 | set_bit(STRIPE_COMPUTE_RUN, &sh->state); | |
3656 | set_bit(STRIPE_OP_COMPUTE_BLK, &s->ops_request); | |
3657 | set_bit(R5_Wantcompute, &dev->flags); | |
3658 | sh->ops.target = disk_idx; | |
3659 | sh->ops.target2 = -1; /* no 2nd target */ | |
3660 | s->req_compute = 1; | |
93b3dbce N |
3661 | /* Careful: from this point on 'uptodate' is in the eye |
3662 | * of raid_run_ops which services 'compute' operations | |
3663 | * before writes. R5_Wantcompute flags a block that will | |
3664 | * be R5_UPTODATE by the time it is needed for a | |
3665 | * subsequent operation. | |
3666 | */ | |
5599becc YT |
3667 | s->uptodate++; |
3668 | return 1; | |
3669 | } else if (s->uptodate == disks-2 && s->failed >= 2) { | |
3670 | /* Computing 2-failure is *very* expensive; only | |
3671 | * do it if failed >= 2 | |
3672 | */ | |
3673 | int other; | |
3674 | for (other = disks; other--; ) { | |
3675 | if (other == disk_idx) | |
3676 | continue; | |
3677 | if (!test_bit(R5_UPTODATE, | |
3678 | &sh->dev[other].flags)) | |
3679 | break; | |
a4456856 | 3680 | } |
5599becc YT |
3681 | BUG_ON(other < 0); |
3682 | pr_debug("Computing stripe %llu blocks %d,%d\n", | |
3683 | (unsigned long long)sh->sector, | |
3684 | disk_idx, other); | |
3685 | set_bit(STRIPE_COMPUTE_RUN, &sh->state); | |
3686 | set_bit(STRIPE_OP_COMPUTE_BLK, &s->ops_request); | |
3687 | set_bit(R5_Wantcompute, &sh->dev[disk_idx].flags); | |
3688 | set_bit(R5_Wantcompute, &sh->dev[other].flags); | |
3689 | sh->ops.target = disk_idx; | |
3690 | sh->ops.target2 = other; | |
3691 | s->uptodate += 2; | |
3692 | s->req_compute = 1; | |
3693 | return 1; | |
3694 | } else if (test_bit(R5_Insync, &dev->flags)) { | |
3695 | set_bit(R5_LOCKED, &dev->flags); | |
3696 | set_bit(R5_Wantread, &dev->flags); | |
3697 | s->locked++; | |
3698 | pr_debug("Reading block %d (sync=%d)\n", | |
3699 | disk_idx, s->syncing); | |
a4456856 DW |
3700 | } |
3701 | } | |
5599becc YT |
3702 | |
3703 | return 0; | |
3704 | } | |
3705 | ||
3706 | /** | |
93b3dbce | 3707 | * handle_stripe_fill - read or compute data to satisfy pending requests. |
5599becc | 3708 | */ |
93b3dbce N |
3709 | static void handle_stripe_fill(struct stripe_head *sh, |
3710 | struct stripe_head_state *s, | |
3711 | int disks) | |
5599becc YT |
3712 | { |
3713 | int i; | |
3714 | ||
3715 | /* look for blocks to read/compute, skip this if a compute | |
3716 | * is already in flight, or if the stripe contents are in the | |
3717 | * midst of changing due to a write | |
3718 | */ | |
3719 | if (!test_bit(STRIPE_COMPUTE_RUN, &sh->state) && !sh->check_state && | |
07e83364 SL |
3720 | !sh->reconstruct_state) { |
3721 | ||
3722 | /* | |
3723 | * For degraded stripe with data in journal, do not handle | |
3724 | * read requests yet, instead, flush the stripe to raid | |
3725 | * disks first, this avoids handling complex rmw of write | |
3726 | * back cache (prexor with orig_page, and then xor with | |
3727 | * page) in the read path | |
3728 | */ | |
3729 | if (s->injournal && s->failed) { | |
3730 | if (test_bit(STRIPE_R5C_CACHING, &sh->state)) | |
3731 | r5c_make_stripe_write_out(sh); | |
3732 | goto out; | |
3733 | } | |
3734 | ||
5599becc | 3735 | for (i = disks; i--; ) |
93b3dbce | 3736 | if (fetch_block(sh, s, i, disks)) |
5599becc | 3737 | break; |
07e83364 SL |
3738 | } |
3739 | out: | |
a4456856 DW |
3740 | set_bit(STRIPE_HANDLE, &sh->state); |
3741 | } | |
3742 | ||
787b76fa N |
3743 | static void break_stripe_batch_list(struct stripe_head *head_sh, |
3744 | unsigned long handle_flags); | |
1fe797e6 | 3745 | /* handle_stripe_clean_event |
a4456856 DW |
3746 | * any written block on an uptodate or failed drive can be returned. |
3747 | * Note that if we 'wrote' to a failed drive, it will be UPTODATE, but | |
3748 | * never LOCKED, so we don't need to test 'failed' directly. | |
3749 | */ | |
d1688a6d | 3750 | static void handle_stripe_clean_event(struct r5conf *conf, |
bd83d0a2 | 3751 | struct stripe_head *sh, int disks) |
a4456856 DW |
3752 | { |
3753 | int i; | |
3754 | struct r5dev *dev; | |
f8dfcffd | 3755 | int discard_pending = 0; |
59fc630b | 3756 | struct stripe_head *head_sh = sh; |
3757 | bool do_endio = false; | |
a4456856 DW |
3758 | |
3759 | for (i = disks; i--; ) | |
3760 | if (sh->dev[i].written) { | |
3761 | dev = &sh->dev[i]; | |
3762 | if (!test_bit(R5_LOCKED, &dev->flags) && | |
9e444768 | 3763 | (test_bit(R5_UPTODATE, &dev->flags) || |
d592a996 SL |
3764 | test_bit(R5_Discard, &dev->flags) || |
3765 | test_bit(R5_SkipCopy, &dev->flags))) { | |
a4456856 DW |
3766 | /* We can return any write requests */ |
3767 | struct bio *wbi, *wbi2; | |
45b4233c | 3768 | pr_debug("Return write for disc %d\n", i); |
ca64cae9 N |
3769 | if (test_and_clear_bit(R5_Discard, &dev->flags)) |
3770 | clear_bit(R5_UPTODATE, &dev->flags); | |
d592a996 SL |
3771 | if (test_and_clear_bit(R5_SkipCopy, &dev->flags)) { |
3772 | WARN_ON(test_bit(R5_UPTODATE, &dev->flags)); | |
d592a996 | 3773 | } |
59fc630b | 3774 | do_endio = true; |
3775 | ||
3776 | returnbi: | |
3777 | dev->page = dev->orig_page; | |
a4456856 DW |
3778 | wbi = dev->written; |
3779 | dev->written = NULL; | |
4f024f37 | 3780 | while (wbi && wbi->bi_iter.bi_sector < |
a4456856 DW |
3781 | dev->sector + STRIPE_SECTORS) { |
3782 | wbi2 = r5_next_bio(wbi, dev->sector); | |
49728050 | 3783 | md_write_end(conf->mddev); |
016c76ac | 3784 | bio_endio(wbi); |
a4456856 DW |
3785 | wbi = wbi2; |
3786 | } | |
e64e4018 AS |
3787 | md_bitmap_endwrite(conf->mddev->bitmap, sh->sector, |
3788 | STRIPE_SECTORS, | |
3789 | !test_bit(STRIPE_DEGRADED, &sh->state), | |
3790 | 0); | |
59fc630b | 3791 | if (head_sh->batch_head) { |
3792 | sh = list_first_entry(&sh->batch_list, | |
3793 | struct stripe_head, | |
3794 | batch_list); | |
3795 | if (sh != head_sh) { | |
3796 | dev = &sh->dev[i]; | |
3797 | goto returnbi; | |
3798 | } | |
3799 | } | |
3800 | sh = head_sh; | |
3801 | dev = &sh->dev[i]; | |
f8dfcffd N |
3802 | } else if (test_bit(R5_Discard, &dev->flags)) |
3803 | discard_pending = 1; | |
3804 | } | |
f6bed0ef | 3805 | |
ff875738 | 3806 | log_stripe_write_finished(sh); |
0576b1c6 | 3807 | |
f8dfcffd N |
3808 | if (!discard_pending && |
3809 | test_bit(R5_Discard, &sh->dev[sh->pd_idx].flags)) { | |
b8a9d66d | 3810 | int hash; |
f8dfcffd N |
3811 | clear_bit(R5_Discard, &sh->dev[sh->pd_idx].flags); |
3812 | clear_bit(R5_UPTODATE, &sh->dev[sh->pd_idx].flags); | |
3813 | if (sh->qd_idx >= 0) { | |
3814 | clear_bit(R5_Discard, &sh->dev[sh->qd_idx].flags); | |
3815 | clear_bit(R5_UPTODATE, &sh->dev[sh->qd_idx].flags); | |
3816 | } | |
3817 | /* now that discard is done we can proceed with any sync */ | |
3818 | clear_bit(STRIPE_DISCARD, &sh->state); | |
d47648fc SL |
3819 | /* |
3820 | * SCSI discard will change some bio fields and the stripe has | |
3821 | * no updated data, so remove it from hash list and the stripe | |
3822 | * will be reinitialized | |
3823 | */ | |
59fc630b | 3824 | unhash: |
b8a9d66d RG |
3825 | hash = sh->hash_lock_index; |
3826 | spin_lock_irq(conf->hash_locks + hash); | |
d47648fc | 3827 | remove_hash(sh); |
b8a9d66d | 3828 | spin_unlock_irq(conf->hash_locks + hash); |
59fc630b | 3829 | if (head_sh->batch_head) { |
3830 | sh = list_first_entry(&sh->batch_list, | |
3831 | struct stripe_head, batch_list); | |
3832 | if (sh != head_sh) | |
3833 | goto unhash; | |
3834 | } | |
59fc630b | 3835 | sh = head_sh; |
3836 | ||
f8dfcffd N |
3837 | if (test_bit(STRIPE_SYNC_REQUESTED, &sh->state)) |
3838 | set_bit(STRIPE_HANDLE, &sh->state); | |
3839 | ||
3840 | } | |
8b3e6cdc DW |
3841 | |
3842 | if (test_and_clear_bit(STRIPE_FULL_WRITE, &sh->state)) | |
3843 | if (atomic_dec_and_test(&conf->pending_full_writes)) | |
3844 | md_wakeup_thread(conf->mddev->thread); | |
59fc630b | 3845 | |
787b76fa N |
3846 | if (head_sh->batch_head && do_endio) |
3847 | break_stripe_batch_list(head_sh, STRIPE_EXPAND_SYNC_FLAGS); | |
a4456856 DW |
3848 | } |
3849 | ||
86aa1397 SL |
3850 | /* |
3851 | * For RMW in write back cache, we need extra page in prexor to store the | |
3852 | * old data. This page is stored in dev->orig_page. | |
3853 | * | |
3854 | * This function checks whether we have data for prexor. The exact logic | |
3855 | * is: | |
3856 | * R5_UPTODATE && (!R5_InJournal || R5_OrigPageUPTDODATE) | |
3857 | */ | |
3858 | static inline bool uptodate_for_rmw(struct r5dev *dev) | |
3859 | { | |
3860 | return (test_bit(R5_UPTODATE, &dev->flags)) && | |
3861 | (!test_bit(R5_InJournal, &dev->flags) || | |
3862 | test_bit(R5_OrigPageUPTDODATE, &dev->flags)); | |
3863 | } | |
3864 | ||
d7bd398e SL |
3865 | static int handle_stripe_dirtying(struct r5conf *conf, |
3866 | struct stripe_head *sh, | |
3867 | struct stripe_head_state *s, | |
3868 | int disks) | |
a4456856 DW |
3869 | { |
3870 | int rmw = 0, rcw = 0, i; | |
a7854487 AL |
3871 | sector_t recovery_cp = conf->mddev->recovery_cp; |
3872 | ||
584acdd4 | 3873 | /* Check whether resync is now happening or should start. |
a7854487 AL |
3874 | * If yes, then the array is dirty (after unclean shutdown or |
3875 | * initial creation), so parity in some stripes might be inconsistent. | |
3876 | * In this case, we need to always do reconstruct-write, to ensure | |
3877 | * that in case of drive failure or read-error correction, we | |
3878 | * generate correct data from the parity. | |
3879 | */ | |
584acdd4 | 3880 | if (conf->rmw_level == PARITY_DISABLE_RMW || |
26ac1073 N |
3881 | (recovery_cp < MaxSector && sh->sector >= recovery_cp && |
3882 | s->failed == 0)) { | |
a7854487 | 3883 | /* Calculate the real rcw later - for now make it |
c8ac1803 N |
3884 | * look like rcw is cheaper |
3885 | */ | |
3886 | rcw = 1; rmw = 2; | |
584acdd4 MS |
3887 | pr_debug("force RCW rmw_level=%u, recovery_cp=%llu sh->sector=%llu\n", |
3888 | conf->rmw_level, (unsigned long long)recovery_cp, | |
a7854487 | 3889 | (unsigned long long)sh->sector); |
c8ac1803 | 3890 | } else for (i = disks; i--; ) { |
a4456856 DW |
3891 | /* would I have to read this buffer for read_modify_write */ |
3892 | struct r5dev *dev = &sh->dev[i]; | |
39b99586 | 3893 | if (((dev->towrite && !delay_towrite(conf, dev, s)) || |
07e83364 | 3894 | i == sh->pd_idx || i == sh->qd_idx || |
1e6d690b | 3895 | test_bit(R5_InJournal, &dev->flags)) && |
a4456856 | 3896 | !test_bit(R5_LOCKED, &dev->flags) && |
86aa1397 | 3897 | !(uptodate_for_rmw(dev) || |
f38e1219 | 3898 | test_bit(R5_Wantcompute, &dev->flags))) { |
a4456856 DW |
3899 | if (test_bit(R5_Insync, &dev->flags)) |
3900 | rmw++; | |
3901 | else | |
3902 | rmw += 2*disks; /* cannot read it */ | |
3903 | } | |
3904 | /* Would I have to read this buffer for reconstruct_write */ | |
584acdd4 MS |
3905 | if (!test_bit(R5_OVERWRITE, &dev->flags) && |
3906 | i != sh->pd_idx && i != sh->qd_idx && | |
a4456856 | 3907 | !test_bit(R5_LOCKED, &dev->flags) && |
f38e1219 | 3908 | !(test_bit(R5_UPTODATE, &dev->flags) || |
1e6d690b | 3909 | test_bit(R5_Wantcompute, &dev->flags))) { |
67f45548 N |
3910 | if (test_bit(R5_Insync, &dev->flags)) |
3911 | rcw++; | |
a4456856 DW |
3912 | else |
3913 | rcw += 2*disks; | |
3914 | } | |
3915 | } | |
1e6d690b | 3916 | |
39b99586 SL |
3917 | pr_debug("for sector %llu state 0x%lx, rmw=%d rcw=%d\n", |
3918 | (unsigned long long)sh->sector, sh->state, rmw, rcw); | |
a4456856 | 3919 | set_bit(STRIPE_HANDLE, &sh->state); |
41257580 | 3920 | if ((rmw < rcw || (rmw == rcw && conf->rmw_level == PARITY_PREFER_RMW)) && rmw > 0) { |
a4456856 | 3921 | /* prefer read-modify-write, but need to get some data */ |
e3620a3a JB |
3922 | if (conf->mddev->queue) |
3923 | blk_add_trace_msg(conf->mddev->queue, | |
3924 | "raid5 rmw %llu %d", | |
3925 | (unsigned long long)sh->sector, rmw); | |
a4456856 DW |
3926 | for (i = disks; i--; ) { |
3927 | struct r5dev *dev = &sh->dev[i]; | |
1e6d690b SL |
3928 | if (test_bit(R5_InJournal, &dev->flags) && |
3929 | dev->page == dev->orig_page && | |
3930 | !test_bit(R5_LOCKED, &sh->dev[sh->pd_idx].flags)) { | |
3931 | /* alloc page for prexor */ | |
d7bd398e SL |
3932 | struct page *p = alloc_page(GFP_NOIO); |
3933 | ||
3934 | if (p) { | |
3935 | dev->orig_page = p; | |
3936 | continue; | |
3937 | } | |
3938 | ||
3939 | /* | |
3940 | * alloc_page() failed, try use | |
3941 | * disk_info->extra_page | |
3942 | */ | |
3943 | if (!test_and_set_bit(R5C_EXTRA_PAGE_IN_USE, | |
3944 | &conf->cache_state)) { | |
3945 | r5c_use_extra_page(sh); | |
3946 | break; | |
3947 | } | |
1e6d690b | 3948 | |
d7bd398e SL |
3949 | /* extra_page in use, add to delayed_list */ |
3950 | set_bit(STRIPE_DELAYED, &sh->state); | |
3951 | s->waiting_extra_page = 1; | |
3952 | return -EAGAIN; | |
1e6d690b | 3953 | } |
d7bd398e | 3954 | } |
1e6d690b | 3955 | |
d7bd398e SL |
3956 | for (i = disks; i--; ) { |
3957 | struct r5dev *dev = &sh->dev[i]; | |
39b99586 | 3958 | if (((dev->towrite && !delay_towrite(conf, dev, s)) || |
1e6d690b SL |
3959 | i == sh->pd_idx || i == sh->qd_idx || |
3960 | test_bit(R5_InJournal, &dev->flags)) && | |
a4456856 | 3961 | !test_bit(R5_LOCKED, &dev->flags) && |
86aa1397 | 3962 | !(uptodate_for_rmw(dev) || |
1e6d690b | 3963 | test_bit(R5_Wantcompute, &dev->flags)) && |
a4456856 | 3964 | test_bit(R5_Insync, &dev->flags)) { |
67f45548 N |
3965 | if (test_bit(STRIPE_PREREAD_ACTIVE, |
3966 | &sh->state)) { | |
3967 | pr_debug("Read_old block %d for r-m-w\n", | |
3968 | i); | |
a4456856 DW |
3969 | set_bit(R5_LOCKED, &dev->flags); |
3970 | set_bit(R5_Wantread, &dev->flags); | |
3971 | s->locked++; | |
3972 | } else { | |
3973 | set_bit(STRIPE_DELAYED, &sh->state); | |
3974 | set_bit(STRIPE_HANDLE, &sh->state); | |
3975 | } | |
3976 | } | |
3977 | } | |
a9add5d9 | 3978 | } |
41257580 | 3979 | if ((rcw < rmw || (rcw == rmw && conf->rmw_level != PARITY_PREFER_RMW)) && rcw > 0) { |
a4456856 | 3980 | /* want reconstruct write, but need to get some data */ |
a9add5d9 | 3981 | int qread =0; |
c8ac1803 | 3982 | rcw = 0; |
a4456856 DW |
3983 | for (i = disks; i--; ) { |
3984 | struct r5dev *dev = &sh->dev[i]; | |
3985 | if (!test_bit(R5_OVERWRITE, &dev->flags) && | |
c8ac1803 | 3986 | i != sh->pd_idx && i != sh->qd_idx && |
a4456856 | 3987 | !test_bit(R5_LOCKED, &dev->flags) && |
f38e1219 | 3988 | !(test_bit(R5_UPTODATE, &dev->flags) || |
c8ac1803 N |
3989 | test_bit(R5_Wantcompute, &dev->flags))) { |
3990 | rcw++; | |
67f45548 N |
3991 | if (test_bit(R5_Insync, &dev->flags) && |
3992 | test_bit(STRIPE_PREREAD_ACTIVE, | |
3993 | &sh->state)) { | |
45b4233c | 3994 | pr_debug("Read_old block " |
a4456856 DW |
3995 | "%d for Reconstruct\n", i); |
3996 | set_bit(R5_LOCKED, &dev->flags); | |
3997 | set_bit(R5_Wantread, &dev->flags); | |
3998 | s->locked++; | |
a9add5d9 | 3999 | qread++; |
a4456856 DW |
4000 | } else { |
4001 | set_bit(STRIPE_DELAYED, &sh->state); | |
4002 | set_bit(STRIPE_HANDLE, &sh->state); | |
4003 | } | |
4004 | } | |
4005 | } | |
e3620a3a | 4006 | if (rcw && conf->mddev->queue) |
a9add5d9 N |
4007 | blk_add_trace_msg(conf->mddev->queue, "raid5 rcw %llu %d %d %d", |
4008 | (unsigned long long)sh->sector, | |
4009 | rcw, qread, test_bit(STRIPE_DELAYED, &sh->state)); | |
c8ac1803 | 4010 | } |
b1b02fe9 N |
4011 | |
4012 | if (rcw > disks && rmw > disks && | |
4013 | !test_bit(STRIPE_PREREAD_ACTIVE, &sh->state)) | |
4014 | set_bit(STRIPE_DELAYED, &sh->state); | |
4015 | ||
a4456856 DW |
4016 | /* now if nothing is locked, and if we have enough data, |
4017 | * we can start a write request | |
4018 | */ | |
f38e1219 DW |
4019 | /* since handle_stripe can be called at any time we need to handle the |
4020 | * case where a compute block operation has been submitted and then a | |
ac6b53b6 DW |
4021 | * subsequent call wants to start a write request. raid_run_ops only |
4022 | * handles the case where compute block and reconstruct are requested | |
f38e1219 DW |
4023 | * simultaneously. If this is not the case then new writes need to be |
4024 | * held off until the compute completes. | |
4025 | */ | |
976ea8d4 DW |
4026 | if ((s->req_compute || !test_bit(STRIPE_COMPUTE_RUN, &sh->state)) && |
4027 | (s->locked == 0 && (rcw == 0 || rmw == 0) && | |
1e6d690b | 4028 | !test_bit(STRIPE_BIT_DELAY, &sh->state))) |
c0f7bddb | 4029 | schedule_reconstruction(sh, s, rcw == 0, 0); |
d7bd398e | 4030 | return 0; |
a4456856 DW |
4031 | } |
4032 | ||
d1688a6d | 4033 | static void handle_parity_checks5(struct r5conf *conf, struct stripe_head *sh, |
a4456856 DW |
4034 | struct stripe_head_state *s, int disks) |
4035 | { | |
ecc65c9b | 4036 | struct r5dev *dev = NULL; |
bd2ab670 | 4037 | |
59fc630b | 4038 | BUG_ON(sh->batch_head); |
a4456856 | 4039 | set_bit(STRIPE_HANDLE, &sh->state); |
e89f8962 | 4040 | |
ecc65c9b DW |
4041 | switch (sh->check_state) { |
4042 | case check_state_idle: | |
4043 | /* start a new check operation if there are no failures */ | |
bd2ab670 | 4044 | if (s->failed == 0) { |
bd2ab670 | 4045 | BUG_ON(s->uptodate != disks); |
ecc65c9b DW |
4046 | sh->check_state = check_state_run; |
4047 | set_bit(STRIPE_OP_CHECK, &s->ops_request); | |
bd2ab670 | 4048 | clear_bit(R5_UPTODATE, &sh->dev[sh->pd_idx].flags); |
bd2ab670 | 4049 | s->uptodate--; |
ecc65c9b | 4050 | break; |
bd2ab670 | 4051 | } |
f2b3b44d | 4052 | dev = &sh->dev[s->failed_num[0]]; |
ecc65c9b DW |
4053 | /* fall through */ |
4054 | case check_state_compute_result: | |
4055 | sh->check_state = check_state_idle; | |
4056 | if (!dev) | |
4057 | dev = &sh->dev[sh->pd_idx]; | |
4058 | ||
4059 | /* check that a write has not made the stripe insync */ | |
4060 | if (test_bit(STRIPE_INSYNC, &sh->state)) | |
4061 | break; | |
c8894419 | 4062 | |
a4456856 | 4063 | /* either failed parity check, or recovery is happening */ |
a4456856 DW |
4064 | BUG_ON(!test_bit(R5_UPTODATE, &dev->flags)); |
4065 | BUG_ON(s->uptodate != disks); | |
4066 | ||
4067 | set_bit(R5_LOCKED, &dev->flags); | |
ecc65c9b | 4068 | s->locked++; |
a4456856 | 4069 | set_bit(R5_Wantwrite, &dev->flags); |
830ea016 | 4070 | |
a4456856 | 4071 | clear_bit(STRIPE_DEGRADED, &sh->state); |
a4456856 | 4072 | set_bit(STRIPE_INSYNC, &sh->state); |
ecc65c9b DW |
4073 | break; |
4074 | case check_state_run: | |
4075 | break; /* we will be called again upon completion */ | |
4076 | case check_state_check_result: | |
4077 | sh->check_state = check_state_idle; | |
4078 | ||
4079 | /* if a failure occurred during the check operation, leave | |
4080 | * STRIPE_INSYNC not set and let the stripe be handled again | |
4081 | */ | |
4082 | if (s->failed) | |
4083 | break; | |
4084 | ||
4085 | /* handle a successful check operation, if parity is correct | |
4086 | * we are done. Otherwise update the mismatch count and repair | |
4087 | * parity if !MD_RECOVERY_CHECK | |
4088 | */ | |
ad283ea4 | 4089 | if ((sh->ops.zero_sum_result & SUM_CHECK_P_RESULT) == 0) |
ecc65c9b DW |
4090 | /* parity is correct (on disc, |
4091 | * not in buffer any more) | |
4092 | */ | |
4093 | set_bit(STRIPE_INSYNC, &sh->state); | |
4094 | else { | |
7f7583d4 | 4095 | atomic64_add(STRIPE_SECTORS, &conf->mddev->resync_mismatches); |
e1539036 | 4096 | if (test_bit(MD_RECOVERY_CHECK, &conf->mddev->recovery)) { |
ecc65c9b DW |
4097 | /* don't try to repair!! */ |
4098 | set_bit(STRIPE_INSYNC, &sh->state); | |
e1539036 N |
4099 | pr_warn_ratelimited("%s: mismatch sector in range " |
4100 | "%llu-%llu\n", mdname(conf->mddev), | |
4101 | (unsigned long long) sh->sector, | |
4102 | (unsigned long long) sh->sector + | |
4103 | STRIPE_SECTORS); | |
4104 | } else { | |
ecc65c9b | 4105 | sh->check_state = check_state_compute_run; |
976ea8d4 | 4106 | set_bit(STRIPE_COMPUTE_RUN, &sh->state); |
ecc65c9b DW |
4107 | set_bit(STRIPE_OP_COMPUTE_BLK, &s->ops_request); |
4108 | set_bit(R5_Wantcompute, | |
4109 | &sh->dev[sh->pd_idx].flags); | |
4110 | sh->ops.target = sh->pd_idx; | |
ac6b53b6 | 4111 | sh->ops.target2 = -1; |
ecc65c9b DW |
4112 | s->uptodate++; |
4113 | } | |
4114 | } | |
4115 | break; | |
4116 | case check_state_compute_run: | |
4117 | break; | |
4118 | default: | |
cc6167b4 | 4119 | pr_err("%s: unknown check_state: %d sector: %llu\n", |
ecc65c9b DW |
4120 | __func__, sh->check_state, |
4121 | (unsigned long long) sh->sector); | |
4122 | BUG(); | |
a4456856 DW |
4123 | } |
4124 | } | |
4125 | ||
d1688a6d | 4126 | static void handle_parity_checks6(struct r5conf *conf, struct stripe_head *sh, |
36d1c647 | 4127 | struct stripe_head_state *s, |
f2b3b44d | 4128 | int disks) |
a4456856 | 4129 | { |
a4456856 | 4130 | int pd_idx = sh->pd_idx; |
34e04e87 | 4131 | int qd_idx = sh->qd_idx; |
d82dfee0 | 4132 | struct r5dev *dev; |
a4456856 | 4133 | |
59fc630b | 4134 | BUG_ON(sh->batch_head); |
a4456856 DW |
4135 | set_bit(STRIPE_HANDLE, &sh->state); |
4136 | ||
4137 | BUG_ON(s->failed > 2); | |
d82dfee0 | 4138 | |
a4456856 DW |
4139 | /* Want to check and possibly repair P and Q. |
4140 | * However there could be one 'failed' device, in which | |
4141 | * case we can only check one of them, possibly using the | |
4142 | * other to generate missing data | |
4143 | */ | |
4144 | ||
d82dfee0 DW |
4145 | switch (sh->check_state) { |
4146 | case check_state_idle: | |
4147 | /* start a new check operation if there are < 2 failures */ | |
f2b3b44d | 4148 | if (s->failed == s->q_failed) { |
d82dfee0 | 4149 | /* The only possible failed device holds Q, so it |
a4456856 DW |
4150 | * makes sense to check P (If anything else were failed, |
4151 | * we would have used P to recreate it). | |
4152 | */ | |
d82dfee0 | 4153 | sh->check_state = check_state_run; |
a4456856 | 4154 | } |
f2b3b44d | 4155 | if (!s->q_failed && s->failed < 2) { |
d82dfee0 | 4156 | /* Q is not failed, and we didn't use it to generate |
a4456856 DW |
4157 | * anything, so it makes sense to check it |
4158 | */ | |
d82dfee0 DW |
4159 | if (sh->check_state == check_state_run) |
4160 | sh->check_state = check_state_run_pq; | |
4161 | else | |
4162 | sh->check_state = check_state_run_q; | |
a4456856 | 4163 | } |
a4456856 | 4164 | |
d82dfee0 DW |
4165 | /* discard potentially stale zero_sum_result */ |
4166 | sh->ops.zero_sum_result = 0; | |
a4456856 | 4167 | |
d82dfee0 DW |
4168 | if (sh->check_state == check_state_run) { |
4169 | /* async_xor_zero_sum destroys the contents of P */ | |
4170 | clear_bit(R5_UPTODATE, &sh->dev[pd_idx].flags); | |
4171 | s->uptodate--; | |
a4456856 | 4172 | } |
d82dfee0 DW |
4173 | if (sh->check_state >= check_state_run && |
4174 | sh->check_state <= check_state_run_pq) { | |
4175 | /* async_syndrome_zero_sum preserves P and Q, so | |
4176 | * no need to mark them !uptodate here | |
4177 | */ | |
4178 | set_bit(STRIPE_OP_CHECK, &s->ops_request); | |
4179 | break; | |
a4456856 DW |
4180 | } |
4181 | ||
d82dfee0 DW |
4182 | /* we have 2-disk failure */ |
4183 | BUG_ON(s->failed != 2); | |
4184 | /* fall through */ | |
4185 | case check_state_compute_result: | |
4186 | sh->check_state = check_state_idle; | |
a4456856 | 4187 | |
d82dfee0 DW |
4188 | /* check that a write has not made the stripe insync */ |
4189 | if (test_bit(STRIPE_INSYNC, &sh->state)) | |
4190 | break; | |
a4456856 DW |
4191 | |
4192 | /* now write out any block on a failed drive, | |
d82dfee0 | 4193 | * or P or Q if they were recomputed |
a4456856 | 4194 | */ |
b2176a1d | 4195 | dev = NULL; |
a4456856 | 4196 | if (s->failed == 2) { |
f2b3b44d | 4197 | dev = &sh->dev[s->failed_num[1]]; |
a4456856 DW |
4198 | s->locked++; |
4199 | set_bit(R5_LOCKED, &dev->flags); | |
4200 | set_bit(R5_Wantwrite, &dev->flags); | |
4201 | } | |
4202 | if (s->failed >= 1) { | |
f2b3b44d | 4203 | dev = &sh->dev[s->failed_num[0]]; |
a4456856 DW |
4204 | s->locked++; |
4205 | set_bit(R5_LOCKED, &dev->flags); | |
4206 | set_bit(R5_Wantwrite, &dev->flags); | |
4207 | } | |
d82dfee0 | 4208 | if (sh->ops.zero_sum_result & SUM_CHECK_P_RESULT) { |
a4456856 DW |
4209 | dev = &sh->dev[pd_idx]; |
4210 | s->locked++; | |
4211 | set_bit(R5_LOCKED, &dev->flags); | |
4212 | set_bit(R5_Wantwrite, &dev->flags); | |
4213 | } | |
d82dfee0 | 4214 | if (sh->ops.zero_sum_result & SUM_CHECK_Q_RESULT) { |
a4456856 DW |
4215 | dev = &sh->dev[qd_idx]; |
4216 | s->locked++; | |
4217 | set_bit(R5_LOCKED, &dev->flags); | |
4218 | set_bit(R5_Wantwrite, &dev->flags); | |
4219 | } | |
b2176a1d NC |
4220 | if (WARN_ONCE(dev && !test_bit(R5_UPTODATE, &dev->flags), |
4221 | "%s: disk%td not up to date\n", | |
4222 | mdname(conf->mddev), | |
4223 | dev - (struct r5dev *) &sh->dev)) { | |
4224 | clear_bit(R5_LOCKED, &dev->flags); | |
4225 | clear_bit(R5_Wantwrite, &dev->flags); | |
4226 | s->locked--; | |
4227 | } | |
a4456856 DW |
4228 | clear_bit(STRIPE_DEGRADED, &sh->state); |
4229 | ||
4230 | set_bit(STRIPE_INSYNC, &sh->state); | |
d82dfee0 DW |
4231 | break; |
4232 | case check_state_run: | |
4233 | case check_state_run_q: | |
4234 | case check_state_run_pq: | |
4235 | break; /* we will be called again upon completion */ | |
4236 | case check_state_check_result: | |
4237 | sh->check_state = check_state_idle; | |
4238 | ||
4239 | /* handle a successful check operation, if parity is correct | |
4240 | * we are done. Otherwise update the mismatch count and repair | |
4241 | * parity if !MD_RECOVERY_CHECK | |
4242 | */ | |
4243 | if (sh->ops.zero_sum_result == 0) { | |
a25d8c32 SL |
4244 | /* both parities are correct */ |
4245 | if (!s->failed) | |
4246 | set_bit(STRIPE_INSYNC, &sh->state); | |
4247 | else { | |
4248 | /* in contrast to the raid5 case we can validate | |
4249 | * parity, but still have a failure to write | |
4250 | * back | |
4251 | */ | |
4252 | sh->check_state = check_state_compute_result; | |
4253 | /* Returning at this point means that we may go | |
4254 | * off and bring p and/or q uptodate again so | |
4255 | * we make sure to check zero_sum_result again | |
4256 | * to verify if p or q need writeback | |
4257 | */ | |
4258 | } | |
d82dfee0 | 4259 | } else { |
7f7583d4 | 4260 | atomic64_add(STRIPE_SECTORS, &conf->mddev->resync_mismatches); |
e1539036 | 4261 | if (test_bit(MD_RECOVERY_CHECK, &conf->mddev->recovery)) { |
d82dfee0 DW |
4262 | /* don't try to repair!! */ |
4263 | set_bit(STRIPE_INSYNC, &sh->state); | |
e1539036 N |
4264 | pr_warn_ratelimited("%s: mismatch sector in range " |
4265 | "%llu-%llu\n", mdname(conf->mddev), | |
4266 | (unsigned long long) sh->sector, | |
4267 | (unsigned long long) sh->sector + | |
4268 | STRIPE_SECTORS); | |
4269 | } else { | |
d82dfee0 DW |
4270 | int *target = &sh->ops.target; |
4271 | ||
4272 | sh->ops.target = -1; | |
4273 | sh->ops.target2 = -1; | |
4274 | sh->check_state = check_state_compute_run; | |
4275 | set_bit(STRIPE_COMPUTE_RUN, &sh->state); | |
4276 | set_bit(STRIPE_OP_COMPUTE_BLK, &s->ops_request); | |
4277 | if (sh->ops.zero_sum_result & SUM_CHECK_P_RESULT) { | |
4278 | set_bit(R5_Wantcompute, | |
4279 | &sh->dev[pd_idx].flags); | |
4280 | *target = pd_idx; | |
4281 | target = &sh->ops.target2; | |
4282 | s->uptodate++; | |
4283 | } | |
4284 | if (sh->ops.zero_sum_result & SUM_CHECK_Q_RESULT) { | |
4285 | set_bit(R5_Wantcompute, | |
4286 | &sh->dev[qd_idx].flags); | |
4287 | *target = qd_idx; | |
4288 | s->uptodate++; | |
4289 | } | |
4290 | } | |
4291 | } | |
4292 | break; | |
4293 | case check_state_compute_run: | |
4294 | break; | |
4295 | default: | |
cc6167b4 N |
4296 | pr_warn("%s: unknown check_state: %d sector: %llu\n", |
4297 | __func__, sh->check_state, | |
4298 | (unsigned long long) sh->sector); | |
d82dfee0 | 4299 | BUG(); |
a4456856 DW |
4300 | } |
4301 | } | |
4302 | ||
d1688a6d | 4303 | static void handle_stripe_expansion(struct r5conf *conf, struct stripe_head *sh) |
a4456856 DW |
4304 | { |
4305 | int i; | |
4306 | ||
4307 | /* We have read all the blocks in this stripe and now we need to | |
4308 | * copy some of them into a target stripe for expand. | |
4309 | */ | |
f0a50d37 | 4310 | struct dma_async_tx_descriptor *tx = NULL; |
59fc630b | 4311 | BUG_ON(sh->batch_head); |
a4456856 DW |
4312 | clear_bit(STRIPE_EXPAND_SOURCE, &sh->state); |
4313 | for (i = 0; i < sh->disks; i++) | |
34e04e87 | 4314 | if (i != sh->pd_idx && i != sh->qd_idx) { |
911d4ee8 | 4315 | int dd_idx, j; |
a4456856 | 4316 | struct stripe_head *sh2; |
a08abd8c | 4317 | struct async_submit_ctl submit; |
a4456856 | 4318 | |
6d036f7d | 4319 | sector_t bn = raid5_compute_blocknr(sh, i, 1); |
911d4ee8 N |
4320 | sector_t s = raid5_compute_sector(conf, bn, 0, |
4321 | &dd_idx, NULL); | |
6d036f7d | 4322 | sh2 = raid5_get_active_stripe(conf, s, 0, 1, 1); |
a4456856 DW |
4323 | if (sh2 == NULL) |
4324 | /* so far only the early blocks of this stripe | |
4325 | * have been requested. When later blocks | |
4326 | * get requested, we will try again | |
4327 | */ | |
4328 | continue; | |
4329 | if (!test_bit(STRIPE_EXPANDING, &sh2->state) || | |
4330 | test_bit(R5_Expanded, &sh2->dev[dd_idx].flags)) { | |
4331 | /* must have already done this block */ | |
6d036f7d | 4332 | raid5_release_stripe(sh2); |
a4456856 DW |
4333 | continue; |
4334 | } | |
f0a50d37 DW |
4335 | |
4336 | /* place all the copies on one channel */ | |
a08abd8c | 4337 | init_async_submit(&submit, 0, tx, NULL, NULL, NULL); |
f0a50d37 | 4338 | tx = async_memcpy(sh2->dev[dd_idx].page, |
88ba2aa5 | 4339 | sh->dev[i].page, 0, 0, STRIPE_SIZE, |
a08abd8c | 4340 | &submit); |
f0a50d37 | 4341 | |
a4456856 DW |
4342 | set_bit(R5_Expanded, &sh2->dev[dd_idx].flags); |
4343 | set_bit(R5_UPTODATE, &sh2->dev[dd_idx].flags); | |
4344 | for (j = 0; j < conf->raid_disks; j++) | |
4345 | if (j != sh2->pd_idx && | |
86c374ba | 4346 | j != sh2->qd_idx && |
a4456856 DW |
4347 | !test_bit(R5_Expanded, &sh2->dev[j].flags)) |
4348 | break; | |
4349 | if (j == conf->raid_disks) { | |
4350 | set_bit(STRIPE_EXPAND_READY, &sh2->state); | |
4351 | set_bit(STRIPE_HANDLE, &sh2->state); | |
4352 | } | |
6d036f7d | 4353 | raid5_release_stripe(sh2); |
f0a50d37 | 4354 | |
a4456856 | 4355 | } |
a2e08551 | 4356 | /* done submitting copies, wait for them to complete */ |
749586b7 | 4357 | async_tx_quiesce(&tx); |
a4456856 | 4358 | } |
1da177e4 LT |
4359 | |
4360 | /* | |
4361 | * handle_stripe - do things to a stripe. | |
4362 | * | |
9a3e1101 N |
4363 | * We lock the stripe by setting STRIPE_ACTIVE and then examine the |
4364 | * state of various bits to see what needs to be done. | |
1da177e4 | 4365 | * Possible results: |
9a3e1101 N |
4366 | * return some read requests which now have data |
4367 | * return some write requests which are safely on storage | |
1da177e4 LT |
4368 | * schedule a read on some buffers |
4369 | * schedule a write of some buffers | |
4370 | * return confirmation of parity correctness | |
4371 | * | |
1da177e4 | 4372 | */ |
a4456856 | 4373 | |
acfe726b | 4374 | static void analyse_stripe(struct stripe_head *sh, struct stripe_head_state *s) |
1da177e4 | 4375 | { |
d1688a6d | 4376 | struct r5conf *conf = sh->raid_conf; |
f416885e | 4377 | int disks = sh->disks; |
474af965 N |
4378 | struct r5dev *dev; |
4379 | int i; | |
9a3e1101 | 4380 | int do_recovery = 0; |
1da177e4 | 4381 | |
acfe726b N |
4382 | memset(s, 0, sizeof(*s)); |
4383 | ||
dabc4ec6 | 4384 | s->expanding = test_bit(STRIPE_EXPAND_SOURCE, &sh->state) && !sh->batch_head; |
4385 | s->expanded = test_bit(STRIPE_EXPAND_READY, &sh->state) && !sh->batch_head; | |
acfe726b N |
4386 | s->failed_num[0] = -1; |
4387 | s->failed_num[1] = -1; | |
6e74a9cf | 4388 | s->log_failed = r5l_log_disk_error(conf); |
1da177e4 | 4389 | |
acfe726b | 4390 | /* Now to look around and see what can be done */ |
1da177e4 | 4391 | rcu_read_lock(); |
16a53ecc | 4392 | for (i=disks; i--; ) { |
3cb03002 | 4393 | struct md_rdev *rdev; |
31c176ec N |
4394 | sector_t first_bad; |
4395 | int bad_sectors; | |
4396 | int is_bad = 0; | |
acfe726b | 4397 | |
16a53ecc | 4398 | dev = &sh->dev[i]; |
1da177e4 | 4399 | |
45b4233c | 4400 | pr_debug("check %d: state 0x%lx read %p write %p written %p\n", |
9a3e1101 N |
4401 | i, dev->flags, |
4402 | dev->toread, dev->towrite, dev->written); | |
6c0069c0 YT |
4403 | /* maybe we can reply to a read |
4404 | * | |
4405 | * new wantfill requests are only permitted while | |
4406 | * ops_complete_biofill is guaranteed to be inactive | |
4407 | */ | |
4408 | if (test_bit(R5_UPTODATE, &dev->flags) && dev->toread && | |
4409 | !test_bit(STRIPE_BIOFILL_RUN, &sh->state)) | |
4410 | set_bit(R5_Wantfill, &dev->flags); | |
1da177e4 | 4411 | |
16a53ecc | 4412 | /* now count some things */ |
cc94015a N |
4413 | if (test_bit(R5_LOCKED, &dev->flags)) |
4414 | s->locked++; | |
4415 | if (test_bit(R5_UPTODATE, &dev->flags)) | |
4416 | s->uptodate++; | |
2d6e4ecc | 4417 | if (test_bit(R5_Wantcompute, &dev->flags)) { |
cc94015a N |
4418 | s->compute++; |
4419 | BUG_ON(s->compute > 2); | |
2d6e4ecc | 4420 | } |
1da177e4 | 4421 | |
acfe726b | 4422 | if (test_bit(R5_Wantfill, &dev->flags)) |
cc94015a | 4423 | s->to_fill++; |
acfe726b | 4424 | else if (dev->toread) |
cc94015a | 4425 | s->to_read++; |
16a53ecc | 4426 | if (dev->towrite) { |
cc94015a | 4427 | s->to_write++; |
16a53ecc | 4428 | if (!test_bit(R5_OVERWRITE, &dev->flags)) |
cc94015a | 4429 | s->non_overwrite++; |
16a53ecc | 4430 | } |
a4456856 | 4431 | if (dev->written) |
cc94015a | 4432 | s->written++; |
14a75d3e N |
4433 | /* Prefer to use the replacement for reads, but only |
4434 | * if it is recovered enough and has no bad blocks. | |
4435 | */ | |
4436 | rdev = rcu_dereference(conf->disks[i].replacement); | |
4437 | if (rdev && !test_bit(Faulty, &rdev->flags) && | |
4438 | rdev->recovery_offset >= sh->sector + STRIPE_SECTORS && | |
4439 | !is_badblock(rdev, sh->sector, STRIPE_SECTORS, | |
4440 | &first_bad, &bad_sectors)) | |
4441 | set_bit(R5_ReadRepl, &dev->flags); | |
4442 | else { | |
e6030cb0 | 4443 | if (rdev && !test_bit(Faulty, &rdev->flags)) |
9a3e1101 | 4444 | set_bit(R5_NeedReplace, &dev->flags); |
e6030cb0 N |
4445 | else |
4446 | clear_bit(R5_NeedReplace, &dev->flags); | |
14a75d3e N |
4447 | rdev = rcu_dereference(conf->disks[i].rdev); |
4448 | clear_bit(R5_ReadRepl, &dev->flags); | |
4449 | } | |
9283d8c5 N |
4450 | if (rdev && test_bit(Faulty, &rdev->flags)) |
4451 | rdev = NULL; | |
31c176ec N |
4452 | if (rdev) { |
4453 | is_bad = is_badblock(rdev, sh->sector, STRIPE_SECTORS, | |
4454 | &first_bad, &bad_sectors); | |
4455 | if (s->blocked_rdev == NULL | |
4456 | && (test_bit(Blocked, &rdev->flags) | |
4457 | || is_bad < 0)) { | |
4458 | if (is_bad < 0) | |
4459 | set_bit(BlockedBadBlocks, | |
4460 | &rdev->flags); | |
4461 | s->blocked_rdev = rdev; | |
4462 | atomic_inc(&rdev->nr_pending); | |
4463 | } | |
6bfe0b49 | 4464 | } |
415e72d0 N |
4465 | clear_bit(R5_Insync, &dev->flags); |
4466 | if (!rdev) | |
4467 | /* Not in-sync */; | |
31c176ec N |
4468 | else if (is_bad) { |
4469 | /* also not in-sync */ | |
18b9837e N |
4470 | if (!test_bit(WriteErrorSeen, &rdev->flags) && |
4471 | test_bit(R5_UPTODATE, &dev->flags)) { | |
31c176ec N |
4472 | /* treat as in-sync, but with a read error |
4473 | * which we can now try to correct | |
4474 | */ | |
4475 | set_bit(R5_Insync, &dev->flags); | |
4476 | set_bit(R5_ReadError, &dev->flags); | |
4477 | } | |
4478 | } else if (test_bit(In_sync, &rdev->flags)) | |
415e72d0 | 4479 | set_bit(R5_Insync, &dev->flags); |
30d7a483 | 4480 | else if (sh->sector + STRIPE_SECTORS <= rdev->recovery_offset) |
415e72d0 | 4481 | /* in sync if before recovery_offset */ |
30d7a483 N |
4482 | set_bit(R5_Insync, &dev->flags); |
4483 | else if (test_bit(R5_UPTODATE, &dev->flags) && | |
4484 | test_bit(R5_Expanded, &dev->flags)) | |
4485 | /* If we've reshaped into here, we assume it is Insync. | |
4486 | * We will shortly update recovery_offset to make | |
4487 | * it official. | |
4488 | */ | |
4489 | set_bit(R5_Insync, &dev->flags); | |
4490 | ||
1cc03eb9 | 4491 | if (test_bit(R5_WriteError, &dev->flags)) { |
14a75d3e N |
4492 | /* This flag does not apply to '.replacement' |
4493 | * only to .rdev, so make sure to check that*/ | |
4494 | struct md_rdev *rdev2 = rcu_dereference( | |
4495 | conf->disks[i].rdev); | |
4496 | if (rdev2 == rdev) | |
4497 | clear_bit(R5_Insync, &dev->flags); | |
4498 | if (rdev2 && !test_bit(Faulty, &rdev2->flags)) { | |
bc2607f3 | 4499 | s->handle_bad_blocks = 1; |
14a75d3e | 4500 | atomic_inc(&rdev2->nr_pending); |
bc2607f3 N |
4501 | } else |
4502 | clear_bit(R5_WriteError, &dev->flags); | |
4503 | } | |
1cc03eb9 | 4504 | if (test_bit(R5_MadeGood, &dev->flags)) { |
14a75d3e N |
4505 | /* This flag does not apply to '.replacement' |
4506 | * only to .rdev, so make sure to check that*/ | |
4507 | struct md_rdev *rdev2 = rcu_dereference( | |
4508 | conf->disks[i].rdev); | |
4509 | if (rdev2 && !test_bit(Faulty, &rdev2->flags)) { | |
b84db560 | 4510 | s->handle_bad_blocks = 1; |
14a75d3e | 4511 | atomic_inc(&rdev2->nr_pending); |
b84db560 N |
4512 | } else |
4513 | clear_bit(R5_MadeGood, &dev->flags); | |
4514 | } | |
977df362 N |
4515 | if (test_bit(R5_MadeGoodRepl, &dev->flags)) { |
4516 | struct md_rdev *rdev2 = rcu_dereference( | |
4517 | conf->disks[i].replacement); | |
4518 | if (rdev2 && !test_bit(Faulty, &rdev2->flags)) { | |
4519 | s->handle_bad_blocks = 1; | |
4520 | atomic_inc(&rdev2->nr_pending); | |
4521 | } else | |
4522 | clear_bit(R5_MadeGoodRepl, &dev->flags); | |
4523 | } | |
415e72d0 | 4524 | if (!test_bit(R5_Insync, &dev->flags)) { |
16a53ecc N |
4525 | /* The ReadError flag will just be confusing now */ |
4526 | clear_bit(R5_ReadError, &dev->flags); | |
4527 | clear_bit(R5_ReWrite, &dev->flags); | |
1da177e4 | 4528 | } |
415e72d0 N |
4529 | if (test_bit(R5_ReadError, &dev->flags)) |
4530 | clear_bit(R5_Insync, &dev->flags); | |
4531 | if (!test_bit(R5_Insync, &dev->flags)) { | |
cc94015a N |
4532 | if (s->failed < 2) |
4533 | s->failed_num[s->failed] = i; | |
4534 | s->failed++; | |
9a3e1101 N |
4535 | if (rdev && !test_bit(Faulty, &rdev->flags)) |
4536 | do_recovery = 1; | |
d63e2fc8 BC |
4537 | else if (!rdev) { |
4538 | rdev = rcu_dereference( | |
4539 | conf->disks[i].replacement); | |
4540 | if (rdev && !test_bit(Faulty, &rdev->flags)) | |
4541 | do_recovery = 1; | |
4542 | } | |
415e72d0 | 4543 | } |
2ded3703 SL |
4544 | |
4545 | if (test_bit(R5_InJournal, &dev->flags)) | |
4546 | s->injournal++; | |
1e6d690b SL |
4547 | if (test_bit(R5_InJournal, &dev->flags) && dev->written) |
4548 | s->just_cached++; | |
1da177e4 | 4549 | } |
9a3e1101 N |
4550 | if (test_bit(STRIPE_SYNCING, &sh->state)) { |
4551 | /* If there is a failed device being replaced, | |
4552 | * we must be recovering. | |
4553 | * else if we are after recovery_cp, we must be syncing | |
c6d2e084 | 4554 | * else if MD_RECOVERY_REQUESTED is set, we also are syncing. |
9a3e1101 N |
4555 | * else we can only be replacing |
4556 | * sync and recovery both need to read all devices, and so | |
4557 | * use the same flag. | |
4558 | */ | |
4559 | if (do_recovery || | |
c6d2e084 | 4560 | sh->sector >= conf->mddev->recovery_cp || |
4561 | test_bit(MD_RECOVERY_REQUESTED, &(conf->mddev->recovery))) | |
9a3e1101 N |
4562 | s->syncing = 1; |
4563 | else | |
4564 | s->replacing = 1; | |
4565 | } | |
1da177e4 | 4566 | rcu_read_unlock(); |
cc94015a N |
4567 | } |
4568 | ||
59fc630b | 4569 | static int clear_batch_ready(struct stripe_head *sh) |
4570 | { | |
b15a9dbd N |
4571 | /* Return '1' if this is a member of batch, or |
4572 | * '0' if it is a lone stripe or a head which can now be | |
4573 | * handled. | |
4574 | */ | |
59fc630b | 4575 | struct stripe_head *tmp; |
4576 | if (!test_and_clear_bit(STRIPE_BATCH_READY, &sh->state)) | |
b15a9dbd | 4577 | return (sh->batch_head && sh->batch_head != sh); |
59fc630b | 4578 | spin_lock(&sh->stripe_lock); |
4579 | if (!sh->batch_head) { | |
4580 | spin_unlock(&sh->stripe_lock); | |
4581 | return 0; | |
4582 | } | |
4583 | ||
4584 | /* | |
4585 | * this stripe could be added to a batch list before we check | |
4586 | * BATCH_READY, skips it | |
4587 | */ | |
4588 | if (sh->batch_head != sh) { | |
4589 | spin_unlock(&sh->stripe_lock); | |
4590 | return 1; | |
4591 | } | |
4592 | spin_lock(&sh->batch_lock); | |
4593 | list_for_each_entry(tmp, &sh->batch_list, batch_list) | |
4594 | clear_bit(STRIPE_BATCH_READY, &tmp->state); | |
4595 | spin_unlock(&sh->batch_lock); | |
4596 | spin_unlock(&sh->stripe_lock); | |
4597 | ||
4598 | /* | |
4599 | * BATCH_READY is cleared, no new stripes can be added. | |
4600 | * batch_list can be accessed without lock | |
4601 | */ | |
4602 | return 0; | |
4603 | } | |
4604 | ||
3960ce79 N |
4605 | static void break_stripe_batch_list(struct stripe_head *head_sh, |
4606 | unsigned long handle_flags) | |
72ac7330 | 4607 | { |
4e3d62ff | 4608 | struct stripe_head *sh, *next; |
72ac7330 | 4609 | int i; |
fb642b92 | 4610 | int do_wakeup = 0; |
72ac7330 | 4611 | |
bb27051f N |
4612 | list_for_each_entry_safe(sh, next, &head_sh->batch_list, batch_list) { |
4613 | ||
72ac7330 | 4614 | list_del_init(&sh->batch_list); |
4615 | ||
fb3229d5 | 4616 | WARN_ONCE(sh->state & ((1 << STRIPE_ACTIVE) | |
1b956f7a N |
4617 | (1 << STRIPE_SYNCING) | |
4618 | (1 << STRIPE_REPLACED) | | |
1b956f7a N |
4619 | (1 << STRIPE_DELAYED) | |
4620 | (1 << STRIPE_BIT_DELAY) | | |
4621 | (1 << STRIPE_FULL_WRITE) | | |
4622 | (1 << STRIPE_BIOFILL_RUN) | | |
4623 | (1 << STRIPE_COMPUTE_RUN) | | |
1b956f7a N |
4624 | (1 << STRIPE_DISCARD) | |
4625 | (1 << STRIPE_BATCH_READY) | | |
4626 | (1 << STRIPE_BATCH_ERR) | | |
fb3229d5 SL |
4627 | (1 << STRIPE_BITMAP_PENDING)), |
4628 | "stripe state: %lx\n", sh->state); | |
4629 | WARN_ONCE(head_sh->state & ((1 << STRIPE_DISCARD) | | |
4630 | (1 << STRIPE_REPLACED)), | |
4631 | "head stripe state: %lx\n", head_sh->state); | |
1b956f7a N |
4632 | |
4633 | set_mask_bits(&sh->state, ~(STRIPE_EXPAND_SYNC_FLAGS | | |
550da24f | 4634 | (1 << STRIPE_PREREAD_ACTIVE) | |
184a09eb DY |
4635 | (1 << STRIPE_DEGRADED) | |
4636 | (1 << STRIPE_ON_UNPLUG_LIST)), | |
1b956f7a N |
4637 | head_sh->state & (1 << STRIPE_INSYNC)); |
4638 | ||
72ac7330 | 4639 | sh->check_state = head_sh->check_state; |
4640 | sh->reconstruct_state = head_sh->reconstruct_state; | |
448ec638 AC |
4641 | spin_lock_irq(&sh->stripe_lock); |
4642 | sh->batch_head = NULL; | |
4643 | spin_unlock_irq(&sh->stripe_lock); | |
fb642b92 N |
4644 | for (i = 0; i < sh->disks; i++) { |
4645 | if (test_and_clear_bit(R5_Overlap, &sh->dev[i].flags)) | |
4646 | do_wakeup = 1; | |
72ac7330 | 4647 | sh->dev[i].flags = head_sh->dev[i].flags & |
4648 | (~((1 << R5_WriteError) | (1 << R5_Overlap))); | |
fb642b92 | 4649 | } |
3960ce79 N |
4650 | if (handle_flags == 0 || |
4651 | sh->state & handle_flags) | |
4652 | set_bit(STRIPE_HANDLE, &sh->state); | |
6d036f7d | 4653 | raid5_release_stripe(sh); |
72ac7330 | 4654 | } |
fb642b92 N |
4655 | spin_lock_irq(&head_sh->stripe_lock); |
4656 | head_sh->batch_head = NULL; | |
4657 | spin_unlock_irq(&head_sh->stripe_lock); | |
4658 | for (i = 0; i < head_sh->disks; i++) | |
4659 | if (test_and_clear_bit(R5_Overlap, &head_sh->dev[i].flags)) | |
4660 | do_wakeup = 1; | |
3960ce79 N |
4661 | if (head_sh->state & handle_flags) |
4662 | set_bit(STRIPE_HANDLE, &head_sh->state); | |
fb642b92 N |
4663 | |
4664 | if (do_wakeup) | |
4665 | wake_up(&head_sh->raid_conf->wait_for_overlap); | |
72ac7330 | 4666 | } |
4667 | ||
cc94015a N |
4668 | static void handle_stripe(struct stripe_head *sh) |
4669 | { | |
4670 | struct stripe_head_state s; | |
d1688a6d | 4671 | struct r5conf *conf = sh->raid_conf; |
3687c061 | 4672 | int i; |
84789554 N |
4673 | int prexor; |
4674 | int disks = sh->disks; | |
474af965 | 4675 | struct r5dev *pdev, *qdev; |
cc94015a N |
4676 | |
4677 | clear_bit(STRIPE_HANDLE, &sh->state); | |
257a4b42 | 4678 | if (test_and_set_bit_lock(STRIPE_ACTIVE, &sh->state)) { |
cc94015a N |
4679 | /* already being handled, ensure it gets handled |
4680 | * again when current action finishes */ | |
4681 | set_bit(STRIPE_HANDLE, &sh->state); | |
4682 | return; | |
4683 | } | |
4684 | ||
59fc630b | 4685 | if (clear_batch_ready(sh) ) { |
4686 | clear_bit_unlock(STRIPE_ACTIVE, &sh->state); | |
4687 | return; | |
4688 | } | |
4689 | ||
4e3d62ff | 4690 | if (test_and_clear_bit(STRIPE_BATCH_ERR, &sh->state)) |
3960ce79 | 4691 | break_stripe_batch_list(sh, 0); |
72ac7330 | 4692 | |
dabc4ec6 | 4693 | if (test_bit(STRIPE_SYNC_REQUESTED, &sh->state) && !sh->batch_head) { |
f8dfcffd | 4694 | spin_lock(&sh->stripe_lock); |
5ddf0440 SL |
4695 | /* |
4696 | * Cannot process 'sync' concurrently with 'discard'. | |
4697 | * Flush data in r5cache before 'sync'. | |
4698 | */ | |
4699 | if (!test_bit(STRIPE_R5C_PARTIAL_STRIPE, &sh->state) && | |
4700 | !test_bit(STRIPE_R5C_FULL_STRIPE, &sh->state) && | |
4701 | !test_bit(STRIPE_DISCARD, &sh->state) && | |
f8dfcffd N |
4702 | test_and_clear_bit(STRIPE_SYNC_REQUESTED, &sh->state)) { |
4703 | set_bit(STRIPE_SYNCING, &sh->state); | |
4704 | clear_bit(STRIPE_INSYNC, &sh->state); | |
f94c0b66 | 4705 | clear_bit(STRIPE_REPLACED, &sh->state); |
f8dfcffd N |
4706 | } |
4707 | spin_unlock(&sh->stripe_lock); | |
cc94015a N |
4708 | } |
4709 | clear_bit(STRIPE_DELAYED, &sh->state); | |
4710 | ||
4711 | pr_debug("handling stripe %llu, state=%#lx cnt=%d, " | |
4712 | "pd_idx=%d, qd_idx=%d\n, check:%d, reconstruct:%d\n", | |
4713 | (unsigned long long)sh->sector, sh->state, | |
4714 | atomic_read(&sh->count), sh->pd_idx, sh->qd_idx, | |
4715 | sh->check_state, sh->reconstruct_state); | |
3687c061 | 4716 | |
acfe726b | 4717 | analyse_stripe(sh, &s); |
c5a31000 | 4718 | |
b70abcb2 SL |
4719 | if (test_bit(STRIPE_LOG_TRAPPED, &sh->state)) |
4720 | goto finish; | |
4721 | ||
16d997b7 N |
4722 | if (s.handle_bad_blocks || |
4723 | test_bit(MD_SB_CHANGE_PENDING, &conf->mddev->sb_flags)) { | |
bc2607f3 N |
4724 | set_bit(STRIPE_HANDLE, &sh->state); |
4725 | goto finish; | |
4726 | } | |
4727 | ||
474af965 N |
4728 | if (unlikely(s.blocked_rdev)) { |
4729 | if (s.syncing || s.expanding || s.expanded || | |
9a3e1101 | 4730 | s.replacing || s.to_write || s.written) { |
474af965 N |
4731 | set_bit(STRIPE_HANDLE, &sh->state); |
4732 | goto finish; | |
4733 | } | |
4734 | /* There is nothing for the blocked_rdev to block */ | |
4735 | rdev_dec_pending(s.blocked_rdev, conf->mddev); | |
4736 | s.blocked_rdev = NULL; | |
4737 | } | |
4738 | ||
4739 | if (s.to_fill && !test_bit(STRIPE_BIOFILL_RUN, &sh->state)) { | |
4740 | set_bit(STRIPE_OP_BIOFILL, &s.ops_request); | |
4741 | set_bit(STRIPE_BIOFILL_RUN, &sh->state); | |
4742 | } | |
4743 | ||
4744 | pr_debug("locked=%d uptodate=%d to_read=%d" | |
4745 | " to_write=%d failed=%d failed_num=%d,%d\n", | |
4746 | s.locked, s.uptodate, s.to_read, s.to_write, s.failed, | |
4747 | s.failed_num[0], s.failed_num[1]); | |
70d466f7 SL |
4748 | /* |
4749 | * check if the array has lost more than max_degraded devices and, | |
474af965 | 4750 | * if so, some requests might need to be failed. |
70d466f7 SL |
4751 | * |
4752 | * When journal device failed (log_failed), we will only process | |
4753 | * the stripe if there is data need write to raid disks | |
474af965 | 4754 | */ |
70d466f7 SL |
4755 | if (s.failed > conf->max_degraded || |
4756 | (s.log_failed && s.injournal == 0)) { | |
9a3f530f N |
4757 | sh->check_state = 0; |
4758 | sh->reconstruct_state = 0; | |
626f2092 | 4759 | break_stripe_batch_list(sh, 0); |
9a3f530f | 4760 | if (s.to_read+s.to_write+s.written) |
bd83d0a2 | 4761 | handle_failed_stripe(conf, sh, &s, disks); |
9a3e1101 | 4762 | if (s.syncing + s.replacing) |
9a3f530f N |
4763 | handle_failed_sync(conf, sh, &s); |
4764 | } | |
474af965 | 4765 | |
84789554 N |
4766 | /* Now we check to see if any write operations have recently |
4767 | * completed | |
4768 | */ | |
4769 | prexor = 0; | |
4770 | if (sh->reconstruct_state == reconstruct_state_prexor_drain_result) | |
4771 | prexor = 1; | |
4772 | if (sh->reconstruct_state == reconstruct_state_drain_result || | |
4773 | sh->reconstruct_state == reconstruct_state_prexor_drain_result) { | |
4774 | sh->reconstruct_state = reconstruct_state_idle; | |
4775 | ||
4776 | /* All the 'written' buffers and the parity block are ready to | |
4777 | * be written back to disk | |
4778 | */ | |
9e444768 SL |
4779 | BUG_ON(!test_bit(R5_UPTODATE, &sh->dev[sh->pd_idx].flags) && |
4780 | !test_bit(R5_Discard, &sh->dev[sh->pd_idx].flags)); | |
84789554 | 4781 | BUG_ON(sh->qd_idx >= 0 && |
9e444768 SL |
4782 | !test_bit(R5_UPTODATE, &sh->dev[sh->qd_idx].flags) && |
4783 | !test_bit(R5_Discard, &sh->dev[sh->qd_idx].flags)); | |
84789554 N |
4784 | for (i = disks; i--; ) { |
4785 | struct r5dev *dev = &sh->dev[i]; | |
4786 | if (test_bit(R5_LOCKED, &dev->flags) && | |
4787 | (i == sh->pd_idx || i == sh->qd_idx || | |
1e6d690b SL |
4788 | dev->written || test_bit(R5_InJournal, |
4789 | &dev->flags))) { | |
84789554 N |
4790 | pr_debug("Writing block %d\n", i); |
4791 | set_bit(R5_Wantwrite, &dev->flags); | |
4792 | if (prexor) | |
4793 | continue; | |
9c4bdf69 N |
4794 | if (s.failed > 1) |
4795 | continue; | |
84789554 N |
4796 | if (!test_bit(R5_Insync, &dev->flags) || |
4797 | ((i == sh->pd_idx || i == sh->qd_idx) && | |
4798 | s.failed == 0)) | |
4799 | set_bit(STRIPE_INSYNC, &sh->state); | |
4800 | } | |
4801 | } | |
4802 | if (test_and_clear_bit(STRIPE_PREREAD_ACTIVE, &sh->state)) | |
4803 | s.dec_preread_active = 1; | |
4804 | } | |
4805 | ||
ef5b7c69 N |
4806 | /* |
4807 | * might be able to return some write requests if the parity blocks | |
4808 | * are safe, or on a failed drive | |
4809 | */ | |
4810 | pdev = &sh->dev[sh->pd_idx]; | |
4811 | s.p_failed = (s.failed >= 1 && s.failed_num[0] == sh->pd_idx) | |
4812 | || (s.failed >= 2 && s.failed_num[1] == sh->pd_idx); | |
4813 | qdev = &sh->dev[sh->qd_idx]; | |
4814 | s.q_failed = (s.failed >= 1 && s.failed_num[0] == sh->qd_idx) | |
4815 | || (s.failed >= 2 && s.failed_num[1] == sh->qd_idx) | |
4816 | || conf->level < 6; | |
4817 | ||
4818 | if (s.written && | |
4819 | (s.p_failed || ((test_bit(R5_Insync, &pdev->flags) | |
4820 | && !test_bit(R5_LOCKED, &pdev->flags) | |
4821 | && (test_bit(R5_UPTODATE, &pdev->flags) || | |
4822 | test_bit(R5_Discard, &pdev->flags))))) && | |
4823 | (s.q_failed || ((test_bit(R5_Insync, &qdev->flags) | |
4824 | && !test_bit(R5_LOCKED, &qdev->flags) | |
4825 | && (test_bit(R5_UPTODATE, &qdev->flags) || | |
4826 | test_bit(R5_Discard, &qdev->flags)))))) | |
bd83d0a2 | 4827 | handle_stripe_clean_event(conf, sh, disks); |
ef5b7c69 | 4828 | |
1e6d690b | 4829 | if (s.just_cached) |
bd83d0a2 | 4830 | r5c_handle_cached_data_endio(conf, sh, disks); |
ff875738 | 4831 | log_stripe_write_finished(sh); |
1e6d690b | 4832 | |
ef5b7c69 N |
4833 | /* Now we might consider reading some blocks, either to check/generate |
4834 | * parity, or to satisfy requests | |
4835 | * or to load a block that is being partially written. | |
4836 | */ | |
4837 | if (s.to_read || s.non_overwrite | |
4838 | || (conf->level == 6 && s.to_write && s.failed) | |
4839 | || (s.syncing && (s.uptodate + s.compute < disks)) | |
4840 | || s.replacing | |
4841 | || s.expanding) | |
4842 | handle_stripe_fill(sh, &s, disks); | |
4843 | ||
2ded3703 SL |
4844 | /* |
4845 | * When the stripe finishes full journal write cycle (write to journal | |
4846 | * and raid disk), this is the clean up procedure so it is ready for | |
4847 | * next operation. | |
4848 | */ | |
4849 | r5c_finish_stripe_write_out(conf, sh, &s); | |
4850 | ||
4851 | /* | |
4852 | * Now to consider new write requests, cache write back and what else, | |
4853 | * if anything should be read. We do not handle new writes when: | |
84789554 N |
4854 | * 1/ A 'write' operation (copy+xor) is already in flight. |
4855 | * 2/ A 'check' operation is in flight, as it may clobber the parity | |
4856 | * block. | |
2ded3703 | 4857 | * 3/ A r5c cache log write is in flight. |
84789554 | 4858 | */ |
2ded3703 SL |
4859 | |
4860 | if (!sh->reconstruct_state && !sh->check_state && !sh->log_io) { | |
4861 | if (!r5c_is_writeback(conf->log)) { | |
4862 | if (s.to_write) | |
4863 | handle_stripe_dirtying(conf, sh, &s, disks); | |
4864 | } else { /* write back cache */ | |
4865 | int ret = 0; | |
4866 | ||
4867 | /* First, try handle writes in caching phase */ | |
4868 | if (s.to_write) | |
4869 | ret = r5c_try_caching_write(conf, sh, &s, | |
4870 | disks); | |
4871 | /* | |
4872 | * If caching phase failed: ret == -EAGAIN | |
4873 | * OR | |
4874 | * stripe under reclaim: !caching && injournal | |
4875 | * | |
4876 | * fall back to handle_stripe_dirtying() | |
4877 | */ | |
4878 | if (ret == -EAGAIN || | |
4879 | /* stripe under reclaim: !caching && injournal */ | |
4880 | (!test_bit(STRIPE_R5C_CACHING, &sh->state) && | |
d7bd398e SL |
4881 | s.injournal > 0)) { |
4882 | ret = handle_stripe_dirtying(conf, sh, &s, | |
4883 | disks); | |
4884 | if (ret == -EAGAIN) | |
4885 | goto finish; | |
4886 | } | |
2ded3703 SL |
4887 | } |
4888 | } | |
84789554 N |
4889 | |
4890 | /* maybe we need to check and possibly fix the parity for this stripe | |
4891 | * Any reads will already have been scheduled, so we just see if enough | |
4892 | * data is available. The parity check is held off while parity | |
4893 | * dependent operations are in flight. | |
4894 | */ | |
4895 | if (sh->check_state || | |
4896 | (s.syncing && s.locked == 0 && | |
4897 | !test_bit(STRIPE_COMPUTE_RUN, &sh->state) && | |
4898 | !test_bit(STRIPE_INSYNC, &sh->state))) { | |
4899 | if (conf->level == 6) | |
4900 | handle_parity_checks6(conf, sh, &s, disks); | |
4901 | else | |
4902 | handle_parity_checks5(conf, sh, &s, disks); | |
4903 | } | |
c5a31000 | 4904 | |
f94c0b66 N |
4905 | if ((s.replacing || s.syncing) && s.locked == 0 |
4906 | && !test_bit(STRIPE_COMPUTE_RUN, &sh->state) | |
4907 | && !test_bit(STRIPE_REPLACED, &sh->state)) { | |
9a3e1101 N |
4908 | /* Write out to replacement devices where possible */ |
4909 | for (i = 0; i < conf->raid_disks; i++) | |
f94c0b66 N |
4910 | if (test_bit(R5_NeedReplace, &sh->dev[i].flags)) { |
4911 | WARN_ON(!test_bit(R5_UPTODATE, &sh->dev[i].flags)); | |
9a3e1101 N |
4912 | set_bit(R5_WantReplace, &sh->dev[i].flags); |
4913 | set_bit(R5_LOCKED, &sh->dev[i].flags); | |
4914 | s.locked++; | |
4915 | } | |
f94c0b66 N |
4916 | if (s.replacing) |
4917 | set_bit(STRIPE_INSYNC, &sh->state); | |
4918 | set_bit(STRIPE_REPLACED, &sh->state); | |
9a3e1101 N |
4919 | } |
4920 | if ((s.syncing || s.replacing) && s.locked == 0 && | |
f94c0b66 | 4921 | !test_bit(STRIPE_COMPUTE_RUN, &sh->state) && |
9a3e1101 | 4922 | test_bit(STRIPE_INSYNC, &sh->state)) { |
c5a31000 N |
4923 | md_done_sync(conf->mddev, STRIPE_SECTORS, 1); |
4924 | clear_bit(STRIPE_SYNCING, &sh->state); | |
f8dfcffd N |
4925 | if (test_and_clear_bit(R5_Overlap, &sh->dev[sh->pd_idx].flags)) |
4926 | wake_up(&conf->wait_for_overlap); | |
c5a31000 N |
4927 | } |
4928 | ||
4929 | /* If the failed drives are just a ReadError, then we might need | |
4930 | * to progress the repair/check process | |
4931 | */ | |
4932 | if (s.failed <= conf->max_degraded && !conf->mddev->ro) | |
4933 | for (i = 0; i < s.failed; i++) { | |
4934 | struct r5dev *dev = &sh->dev[s.failed_num[i]]; | |
4935 | if (test_bit(R5_ReadError, &dev->flags) | |
4936 | && !test_bit(R5_LOCKED, &dev->flags) | |
4937 | && test_bit(R5_UPTODATE, &dev->flags) | |
4938 | ) { | |
4939 | if (!test_bit(R5_ReWrite, &dev->flags)) { | |
4940 | set_bit(R5_Wantwrite, &dev->flags); | |
4941 | set_bit(R5_ReWrite, &dev->flags); | |
4942 | set_bit(R5_LOCKED, &dev->flags); | |
4943 | s.locked++; | |
4944 | } else { | |
4945 | /* let's read it back */ | |
4946 | set_bit(R5_Wantread, &dev->flags); | |
4947 | set_bit(R5_LOCKED, &dev->flags); | |
4948 | s.locked++; | |
4949 | } | |
4950 | } | |
4951 | } | |
4952 | ||
3687c061 N |
4953 | /* Finish reconstruct operations initiated by the expansion process */ |
4954 | if (sh->reconstruct_state == reconstruct_state_result) { | |
4955 | struct stripe_head *sh_src | |
6d036f7d | 4956 | = raid5_get_active_stripe(conf, sh->sector, 1, 1, 1); |
3687c061 N |
4957 | if (sh_src && test_bit(STRIPE_EXPAND_SOURCE, &sh_src->state)) { |
4958 | /* sh cannot be written until sh_src has been read. | |
4959 | * so arrange for sh to be delayed a little | |
4960 | */ | |
4961 | set_bit(STRIPE_DELAYED, &sh->state); | |
4962 | set_bit(STRIPE_HANDLE, &sh->state); | |
4963 | if (!test_and_set_bit(STRIPE_PREREAD_ACTIVE, | |
4964 | &sh_src->state)) | |
4965 | atomic_inc(&conf->preread_active_stripes); | |
6d036f7d | 4966 | raid5_release_stripe(sh_src); |
3687c061 N |
4967 | goto finish; |
4968 | } | |
4969 | if (sh_src) | |
6d036f7d | 4970 | raid5_release_stripe(sh_src); |
3687c061 N |
4971 | |
4972 | sh->reconstruct_state = reconstruct_state_idle; | |
4973 | clear_bit(STRIPE_EXPANDING, &sh->state); | |
4974 | for (i = conf->raid_disks; i--; ) { | |
4975 | set_bit(R5_Wantwrite, &sh->dev[i].flags); | |
4976 | set_bit(R5_LOCKED, &sh->dev[i].flags); | |
4977 | s.locked++; | |
4978 | } | |
4979 | } | |
f416885e | 4980 | |
3687c061 N |
4981 | if (s.expanded && test_bit(STRIPE_EXPANDING, &sh->state) && |
4982 | !sh->reconstruct_state) { | |
4983 | /* Need to write out all blocks after computing parity */ | |
4984 | sh->disks = conf->raid_disks; | |
4985 | stripe_set_idx(sh->sector, conf, 0, sh); | |
4986 | schedule_reconstruction(sh, &s, 1, 1); | |
4987 | } else if (s.expanded && !sh->reconstruct_state && s.locked == 0) { | |
4988 | clear_bit(STRIPE_EXPAND_READY, &sh->state); | |
4989 | atomic_dec(&conf->reshape_stripes); | |
4990 | wake_up(&conf->wait_for_overlap); | |
4991 | md_done_sync(conf->mddev, STRIPE_SECTORS, 1); | |
4992 | } | |
4993 | ||
4994 | if (s.expanding && s.locked == 0 && | |
4995 | !test_bit(STRIPE_COMPUTE_RUN, &sh->state)) | |
4996 | handle_stripe_expansion(conf, sh); | |
16a53ecc | 4997 | |
3687c061 | 4998 | finish: |
6bfe0b49 | 4999 | /* wait for this device to become unblocked */ |
5f066c63 N |
5000 | if (unlikely(s.blocked_rdev)) { |
5001 | if (conf->mddev->external) | |
5002 | md_wait_for_blocked_rdev(s.blocked_rdev, | |
5003 | conf->mddev); | |
5004 | else | |
5005 | /* Internal metadata will immediately | |
5006 | * be written by raid5d, so we don't | |
5007 | * need to wait here. | |
5008 | */ | |
5009 | rdev_dec_pending(s.blocked_rdev, | |
5010 | conf->mddev); | |
5011 | } | |
6bfe0b49 | 5012 | |
bc2607f3 N |
5013 | if (s.handle_bad_blocks) |
5014 | for (i = disks; i--; ) { | |
3cb03002 | 5015 | struct md_rdev *rdev; |
bc2607f3 N |
5016 | struct r5dev *dev = &sh->dev[i]; |
5017 | if (test_and_clear_bit(R5_WriteError, &dev->flags)) { | |
5018 | /* We own a safe reference to the rdev */ | |
5019 | rdev = conf->disks[i].rdev; | |
5020 | if (!rdev_set_badblocks(rdev, sh->sector, | |
5021 | STRIPE_SECTORS, 0)) | |
5022 | md_error(conf->mddev, rdev); | |
5023 | rdev_dec_pending(rdev, conf->mddev); | |
5024 | } | |
b84db560 N |
5025 | if (test_and_clear_bit(R5_MadeGood, &dev->flags)) { |
5026 | rdev = conf->disks[i].rdev; | |
5027 | rdev_clear_badblocks(rdev, sh->sector, | |
c6563a8c | 5028 | STRIPE_SECTORS, 0); |
b84db560 N |
5029 | rdev_dec_pending(rdev, conf->mddev); |
5030 | } | |
977df362 N |
5031 | if (test_and_clear_bit(R5_MadeGoodRepl, &dev->flags)) { |
5032 | rdev = conf->disks[i].replacement; | |
dd054fce N |
5033 | if (!rdev) |
5034 | /* rdev have been moved down */ | |
5035 | rdev = conf->disks[i].rdev; | |
977df362 | 5036 | rdev_clear_badblocks(rdev, sh->sector, |
c6563a8c | 5037 | STRIPE_SECTORS, 0); |
977df362 N |
5038 | rdev_dec_pending(rdev, conf->mddev); |
5039 | } | |
bc2607f3 N |
5040 | } |
5041 | ||
6c0069c0 YT |
5042 | if (s.ops_request) |
5043 | raid_run_ops(sh, s.ops_request); | |
5044 | ||
f0e43bcd | 5045 | ops_run_io(sh, &s); |
16a53ecc | 5046 | |
c5709ef6 | 5047 | if (s.dec_preread_active) { |
729a1866 | 5048 | /* We delay this until after ops_run_io so that if make_request |
e9c7469b | 5049 | * is waiting on a flush, it won't continue until the writes |
729a1866 N |
5050 | * have actually been submitted. |
5051 | */ | |
5052 | atomic_dec(&conf->preread_active_stripes); | |
5053 | if (atomic_read(&conf->preread_active_stripes) < | |
5054 | IO_THRESHOLD) | |
5055 | md_wakeup_thread(conf->mddev->thread); | |
5056 | } | |
5057 | ||
257a4b42 | 5058 | clear_bit_unlock(STRIPE_ACTIVE, &sh->state); |
16a53ecc N |
5059 | } |
5060 | ||
d1688a6d | 5061 | static void raid5_activate_delayed(struct r5conf *conf) |
16a53ecc N |
5062 | { |
5063 | if (atomic_read(&conf->preread_active_stripes) < IO_THRESHOLD) { | |
5064 | while (!list_empty(&conf->delayed_list)) { | |
5065 | struct list_head *l = conf->delayed_list.next; | |
5066 | struct stripe_head *sh; | |
5067 | sh = list_entry(l, struct stripe_head, lru); | |
5068 | list_del_init(l); | |
5069 | clear_bit(STRIPE_DELAYED, &sh->state); | |
5070 | if (!test_and_set_bit(STRIPE_PREREAD_ACTIVE, &sh->state)) | |
5071 | atomic_inc(&conf->preread_active_stripes); | |
8b3e6cdc | 5072 | list_add_tail(&sh->lru, &conf->hold_list); |
851c30c9 | 5073 | raid5_wakeup_stripe_thread(sh); |
16a53ecc | 5074 | } |
482c0834 | 5075 | } |
16a53ecc N |
5076 | } |
5077 | ||
566c09c5 SL |
5078 | static void activate_bit_delay(struct r5conf *conf, |
5079 | struct list_head *temp_inactive_list) | |
16a53ecc N |
5080 | { |
5081 | /* device_lock is held */ | |
5082 | struct list_head head; | |
5083 | list_add(&head, &conf->bitmap_list); | |
5084 | list_del_init(&conf->bitmap_list); | |
5085 | while (!list_empty(&head)) { | |
5086 | struct stripe_head *sh = list_entry(head.next, struct stripe_head, lru); | |
566c09c5 | 5087 | int hash; |
16a53ecc N |
5088 | list_del_init(&sh->lru); |
5089 | atomic_inc(&sh->count); | |
566c09c5 SL |
5090 | hash = sh->hash_lock_index; |
5091 | __release_stripe(conf, sh, &temp_inactive_list[hash]); | |
16a53ecc N |
5092 | } |
5093 | } | |
5094 | ||
5c675f83 | 5095 | static int raid5_congested(struct mddev *mddev, int bits) |
f022b2fd | 5096 | { |
d1688a6d | 5097 | struct r5conf *conf = mddev->private; |
f022b2fd N |
5098 | |
5099 | /* No difference between reads and writes. Just check | |
5100 | * how busy the stripe_cache is | |
5101 | */ | |
3fa841d7 | 5102 | |
5423399a | 5103 | if (test_bit(R5_INACTIVE_BLOCKED, &conf->cache_state)) |
f022b2fd | 5104 | return 1; |
a39f7afd SL |
5105 | |
5106 | /* Also checks whether there is pressure on r5cache log space */ | |
5107 | if (test_bit(R5C_LOG_TIGHT, &conf->cache_state)) | |
5108 | return 1; | |
f022b2fd N |
5109 | if (conf->quiesce) |
5110 | return 1; | |
4bda556a | 5111 | if (atomic_read(&conf->empty_inactive_list_nr)) |
f022b2fd N |
5112 | return 1; |
5113 | ||
5114 | return 0; | |
5115 | } | |
5116 | ||
fd01b88c | 5117 | static int in_chunk_boundary(struct mddev *mddev, struct bio *bio) |
f679623f | 5118 | { |
3cb5edf4 | 5119 | struct r5conf *conf = mddev->private; |
10433d04 | 5120 | sector_t sector = bio->bi_iter.bi_sector; |
3cb5edf4 | 5121 | unsigned int chunk_sectors; |
aa8b57aa | 5122 | unsigned int bio_sectors = bio_sectors(bio); |
f679623f | 5123 | |
10433d04 CH |
5124 | WARN_ON_ONCE(bio->bi_partno); |
5125 | ||
3cb5edf4 | 5126 | chunk_sectors = min(conf->chunk_sectors, conf->prev_chunk_sectors); |
f679623f RBJ |
5127 | return chunk_sectors >= |
5128 | ((sector & (chunk_sectors - 1)) + bio_sectors); | |
5129 | } | |
5130 | ||
46031f9a RBJ |
5131 | /* |
5132 | * add bio to the retry LIFO ( in O(1) ... we are in interrupt ) | |
5133 | * later sampled by raid5d. | |
5134 | */ | |
d1688a6d | 5135 | static void add_bio_to_retry(struct bio *bi,struct r5conf *conf) |
46031f9a RBJ |
5136 | { |
5137 | unsigned long flags; | |
5138 | ||
5139 | spin_lock_irqsave(&conf->device_lock, flags); | |
5140 | ||
5141 | bi->bi_next = conf->retry_read_aligned_list; | |
5142 | conf->retry_read_aligned_list = bi; | |
5143 | ||
5144 | spin_unlock_irqrestore(&conf->device_lock, flags); | |
5145 | md_wakeup_thread(conf->mddev->thread); | |
5146 | } | |
5147 | ||
0472a42b N |
5148 | static struct bio *remove_bio_from_retry(struct r5conf *conf, |
5149 | unsigned int *offset) | |
46031f9a RBJ |
5150 | { |
5151 | struct bio *bi; | |
5152 | ||
5153 | bi = conf->retry_read_aligned; | |
5154 | if (bi) { | |
0472a42b | 5155 | *offset = conf->retry_read_offset; |
46031f9a RBJ |
5156 | conf->retry_read_aligned = NULL; |
5157 | return bi; | |
5158 | } | |
5159 | bi = conf->retry_read_aligned_list; | |
5160 | if(bi) { | |
387bb173 | 5161 | conf->retry_read_aligned_list = bi->bi_next; |
46031f9a | 5162 | bi->bi_next = NULL; |
0472a42b | 5163 | *offset = 0; |
46031f9a RBJ |
5164 | } |
5165 | ||
5166 | return bi; | |
5167 | } | |
5168 | ||
f679623f RBJ |
5169 | /* |
5170 | * The "raid5_align_endio" should check if the read succeeded and if it | |
5171 | * did, call bio_endio on the original bio (having bio_put the new bio | |
5172 | * first). | |
5173 | * If the read failed.. | |
5174 | */ | |
4246a0b6 | 5175 | static void raid5_align_endio(struct bio *bi) |
f679623f RBJ |
5176 | { |
5177 | struct bio* raid_bi = bi->bi_private; | |
fd01b88c | 5178 | struct mddev *mddev; |
d1688a6d | 5179 | struct r5conf *conf; |
3cb03002 | 5180 | struct md_rdev *rdev; |
4e4cbee9 | 5181 | blk_status_t error = bi->bi_status; |
46031f9a | 5182 | |
f679623f | 5183 | bio_put(bi); |
46031f9a | 5184 | |
46031f9a RBJ |
5185 | rdev = (void*)raid_bi->bi_next; |
5186 | raid_bi->bi_next = NULL; | |
2b7f2228 N |
5187 | mddev = rdev->mddev; |
5188 | conf = mddev->private; | |
46031f9a RBJ |
5189 | |
5190 | rdev_dec_pending(rdev, conf->mddev); | |
5191 | ||
9b81c842 | 5192 | if (!error) { |
4246a0b6 | 5193 | bio_endio(raid_bi); |
46031f9a | 5194 | if (atomic_dec_and_test(&conf->active_aligned_reads)) |
b1b46486 | 5195 | wake_up(&conf->wait_for_quiescent); |
6712ecf8 | 5196 | return; |
46031f9a RBJ |
5197 | } |
5198 | ||
45b4233c | 5199 | pr_debug("raid5_align_endio : io error...handing IO for a retry\n"); |
46031f9a RBJ |
5200 | |
5201 | add_bio_to_retry(raid_bi, conf); | |
f679623f RBJ |
5202 | } |
5203 | ||
7ef6b12a | 5204 | static int raid5_read_one_chunk(struct mddev *mddev, struct bio *raid_bio) |
f679623f | 5205 | { |
d1688a6d | 5206 | struct r5conf *conf = mddev->private; |
8553fe7e | 5207 | int dd_idx; |
f679623f | 5208 | struct bio* align_bi; |
3cb03002 | 5209 | struct md_rdev *rdev; |
671488cc | 5210 | sector_t end_sector; |
f679623f RBJ |
5211 | |
5212 | if (!in_chunk_boundary(mddev, raid_bio)) { | |
7ef6b12a | 5213 | pr_debug("%s: non aligned\n", __func__); |
f679623f RBJ |
5214 | return 0; |
5215 | } | |
5216 | /* | |
d7a10308 | 5217 | * use bio_clone_fast to make a copy of the bio |
f679623f | 5218 | */ |
afeee514 | 5219 | align_bi = bio_clone_fast(raid_bio, GFP_NOIO, &mddev->bio_set); |
f679623f RBJ |
5220 | if (!align_bi) |
5221 | return 0; | |
5222 | /* | |
5223 | * set bi_end_io to a new function, and set bi_private to the | |
5224 | * original bio. | |
5225 | */ | |
5226 | align_bi->bi_end_io = raid5_align_endio; | |
5227 | align_bi->bi_private = raid_bio; | |
5228 | /* | |
5229 | * compute position | |
5230 | */ | |
4f024f37 KO |
5231 | align_bi->bi_iter.bi_sector = |
5232 | raid5_compute_sector(conf, raid_bio->bi_iter.bi_sector, | |
5233 | 0, &dd_idx, NULL); | |
f679623f | 5234 | |
f73a1c7d | 5235 | end_sector = bio_end_sector(align_bi); |
f679623f | 5236 | rcu_read_lock(); |
671488cc N |
5237 | rdev = rcu_dereference(conf->disks[dd_idx].replacement); |
5238 | if (!rdev || test_bit(Faulty, &rdev->flags) || | |
5239 | rdev->recovery_offset < end_sector) { | |
5240 | rdev = rcu_dereference(conf->disks[dd_idx].rdev); | |
5241 | if (rdev && | |
5242 | (test_bit(Faulty, &rdev->flags) || | |
5243 | !(test_bit(In_sync, &rdev->flags) || | |
5244 | rdev->recovery_offset >= end_sector))) | |
5245 | rdev = NULL; | |
5246 | } | |
03b047f4 SL |
5247 | |
5248 | if (r5c_big_stripe_cached(conf, align_bi->bi_iter.bi_sector)) { | |
5249 | rcu_read_unlock(); | |
5250 | bio_put(align_bi); | |
5251 | return 0; | |
5252 | } | |
5253 | ||
671488cc | 5254 | if (rdev) { |
31c176ec N |
5255 | sector_t first_bad; |
5256 | int bad_sectors; | |
5257 | ||
f679623f RBJ |
5258 | atomic_inc(&rdev->nr_pending); |
5259 | rcu_read_unlock(); | |
46031f9a | 5260 | raid_bio->bi_next = (void*)rdev; |
74d46992 | 5261 | bio_set_dev(align_bi, rdev->bdev); |
46031f9a | 5262 | |
7140aafc | 5263 | if (is_badblock(rdev, align_bi->bi_iter.bi_sector, |
4f024f37 | 5264 | bio_sectors(align_bi), |
31c176ec | 5265 | &first_bad, &bad_sectors)) { |
387bb173 NB |
5266 | bio_put(align_bi); |
5267 | rdev_dec_pending(rdev, mddev); | |
5268 | return 0; | |
5269 | } | |
5270 | ||
6c0544e2 | 5271 | /* No reshape active, so we can trust rdev->data_offset */ |
4f024f37 | 5272 | align_bi->bi_iter.bi_sector += rdev->data_offset; |
6c0544e2 | 5273 | |
46031f9a | 5274 | spin_lock_irq(&conf->device_lock); |
b1b46486 | 5275 | wait_event_lock_irq(conf->wait_for_quiescent, |
46031f9a | 5276 | conf->quiesce == 0, |
eed8c02e | 5277 | conf->device_lock); |
46031f9a RBJ |
5278 | atomic_inc(&conf->active_aligned_reads); |
5279 | spin_unlock_irq(&conf->device_lock); | |
5280 | ||
e3620a3a | 5281 | if (mddev->gendisk) |
74d46992 | 5282 | trace_block_bio_remap(align_bi->bi_disk->queue, |
e3620a3a | 5283 | align_bi, disk_devt(mddev->gendisk), |
4f024f37 | 5284 | raid_bio->bi_iter.bi_sector); |
f679623f RBJ |
5285 | generic_make_request(align_bi); |
5286 | return 1; | |
5287 | } else { | |
5288 | rcu_read_unlock(); | |
46031f9a | 5289 | bio_put(align_bi); |
f679623f RBJ |
5290 | return 0; |
5291 | } | |
5292 | } | |
5293 | ||
7ef6b12a ML |
5294 | static struct bio *chunk_aligned_read(struct mddev *mddev, struct bio *raid_bio) |
5295 | { | |
5296 | struct bio *split; | |
dd7a8f5d N |
5297 | sector_t sector = raid_bio->bi_iter.bi_sector; |
5298 | unsigned chunk_sects = mddev->chunk_sectors; | |
5299 | unsigned sectors = chunk_sects - (sector & (chunk_sects-1)); | |
7ef6b12a | 5300 | |
dd7a8f5d N |
5301 | if (sectors < bio_sectors(raid_bio)) { |
5302 | struct r5conf *conf = mddev->private; | |
afeee514 | 5303 | split = bio_split(raid_bio, sectors, GFP_NOIO, &conf->bio_split); |
dd7a8f5d N |
5304 | bio_chain(split, raid_bio); |
5305 | generic_make_request(raid_bio); | |
5306 | raid_bio = split; | |
5307 | } | |
7ef6b12a | 5308 | |
dd7a8f5d N |
5309 | if (!raid5_read_one_chunk(mddev, raid_bio)) |
5310 | return raid_bio; | |
7ef6b12a ML |
5311 | |
5312 | return NULL; | |
5313 | } | |
5314 | ||
8b3e6cdc DW |
5315 | /* __get_priority_stripe - get the next stripe to process |
5316 | * | |
5317 | * Full stripe writes are allowed to pass preread active stripes up until | |
5318 | * the bypass_threshold is exceeded. In general the bypass_count | |
5319 | * increments when the handle_list is handled before the hold_list; however, it | |
5320 | * will not be incremented when STRIPE_IO_STARTED is sampled set signifying a | |
5321 | * stripe with in flight i/o. The bypass_count will be reset when the | |
5322 | * head of the hold_list has changed, i.e. the head was promoted to the | |
5323 | * handle_list. | |
5324 | */ | |
851c30c9 | 5325 | static struct stripe_head *__get_priority_stripe(struct r5conf *conf, int group) |
8b3e6cdc | 5326 | { |
535ae4eb | 5327 | struct stripe_head *sh, *tmp; |
851c30c9 | 5328 | struct list_head *handle_list = NULL; |
535ae4eb | 5329 | struct r5worker_group *wg; |
70d466f7 SL |
5330 | bool second_try = !r5c_is_writeback(conf->log) && |
5331 | !r5l_log_disk_error(conf); | |
5332 | bool try_loprio = test_bit(R5C_LOG_TIGHT, &conf->cache_state) || | |
5333 | r5l_log_disk_error(conf); | |
851c30c9 | 5334 | |
535ae4eb SL |
5335 | again: |
5336 | wg = NULL; | |
5337 | sh = NULL; | |
851c30c9 | 5338 | if (conf->worker_cnt_per_group == 0) { |
535ae4eb SL |
5339 | handle_list = try_loprio ? &conf->loprio_list : |
5340 | &conf->handle_list; | |
851c30c9 | 5341 | } else if (group != ANY_GROUP) { |
535ae4eb SL |
5342 | handle_list = try_loprio ? &conf->worker_groups[group].loprio_list : |
5343 | &conf->worker_groups[group].handle_list; | |
bfc90cb0 | 5344 | wg = &conf->worker_groups[group]; |
851c30c9 SL |
5345 | } else { |
5346 | int i; | |
5347 | for (i = 0; i < conf->group_cnt; i++) { | |
535ae4eb SL |
5348 | handle_list = try_loprio ? &conf->worker_groups[i].loprio_list : |
5349 | &conf->worker_groups[i].handle_list; | |
bfc90cb0 | 5350 | wg = &conf->worker_groups[i]; |
851c30c9 SL |
5351 | if (!list_empty(handle_list)) |
5352 | break; | |
5353 | } | |
5354 | } | |
8b3e6cdc DW |
5355 | |
5356 | pr_debug("%s: handle: %s hold: %s full_writes: %d bypass_count: %d\n", | |
5357 | __func__, | |
851c30c9 | 5358 | list_empty(handle_list) ? "empty" : "busy", |
8b3e6cdc DW |
5359 | list_empty(&conf->hold_list) ? "empty" : "busy", |
5360 | atomic_read(&conf->pending_full_writes), conf->bypass_count); | |
5361 | ||
851c30c9 SL |
5362 | if (!list_empty(handle_list)) { |
5363 | sh = list_entry(handle_list->next, typeof(*sh), lru); | |
8b3e6cdc DW |
5364 | |
5365 | if (list_empty(&conf->hold_list)) | |
5366 | conf->bypass_count = 0; | |
5367 | else if (!test_bit(STRIPE_IO_STARTED, &sh->state)) { | |
5368 | if (conf->hold_list.next == conf->last_hold) | |
5369 | conf->bypass_count++; | |
5370 | else { | |
5371 | conf->last_hold = conf->hold_list.next; | |
5372 | conf->bypass_count -= conf->bypass_threshold; | |
5373 | if (conf->bypass_count < 0) | |
5374 | conf->bypass_count = 0; | |
5375 | } | |
5376 | } | |
5377 | } else if (!list_empty(&conf->hold_list) && | |
5378 | ((conf->bypass_threshold && | |
5379 | conf->bypass_count > conf->bypass_threshold) || | |
5380 | atomic_read(&conf->pending_full_writes) == 0)) { | |
851c30c9 SL |
5381 | |
5382 | list_for_each_entry(tmp, &conf->hold_list, lru) { | |
5383 | if (conf->worker_cnt_per_group == 0 || | |
5384 | group == ANY_GROUP || | |
5385 | !cpu_online(tmp->cpu) || | |
5386 | cpu_to_group(tmp->cpu) == group) { | |
5387 | sh = tmp; | |
5388 | break; | |
5389 | } | |
5390 | } | |
5391 | ||
5392 | if (sh) { | |
5393 | conf->bypass_count -= conf->bypass_threshold; | |
5394 | if (conf->bypass_count < 0) | |
5395 | conf->bypass_count = 0; | |
5396 | } | |
bfc90cb0 | 5397 | wg = NULL; |
851c30c9 SL |
5398 | } |
5399 | ||
535ae4eb SL |
5400 | if (!sh) { |
5401 | if (second_try) | |
5402 | return NULL; | |
5403 | second_try = true; | |
5404 | try_loprio = !try_loprio; | |
5405 | goto again; | |
5406 | } | |
8b3e6cdc | 5407 | |
bfc90cb0 SL |
5408 | if (wg) { |
5409 | wg->stripes_cnt--; | |
5410 | sh->group = NULL; | |
5411 | } | |
8b3e6cdc | 5412 | list_del_init(&sh->lru); |
c7a6d35e | 5413 | BUG_ON(atomic_inc_return(&sh->count) != 1); |
8b3e6cdc DW |
5414 | return sh; |
5415 | } | |
f679623f | 5416 | |
8811b596 SL |
5417 | struct raid5_plug_cb { |
5418 | struct blk_plug_cb cb; | |
5419 | struct list_head list; | |
566c09c5 | 5420 | struct list_head temp_inactive_list[NR_STRIPE_HASH_LOCKS]; |
8811b596 SL |
5421 | }; |
5422 | ||
5423 | static void raid5_unplug(struct blk_plug_cb *blk_cb, bool from_schedule) | |
5424 | { | |
5425 | struct raid5_plug_cb *cb = container_of( | |
5426 | blk_cb, struct raid5_plug_cb, cb); | |
5427 | struct stripe_head *sh; | |
5428 | struct mddev *mddev = cb->cb.data; | |
5429 | struct r5conf *conf = mddev->private; | |
a9add5d9 | 5430 | int cnt = 0; |
566c09c5 | 5431 | int hash; |
8811b596 SL |
5432 | |
5433 | if (cb->list.next && !list_empty(&cb->list)) { | |
5434 | spin_lock_irq(&conf->device_lock); | |
5435 | while (!list_empty(&cb->list)) { | |
5436 | sh = list_first_entry(&cb->list, struct stripe_head, lru); | |
5437 | list_del_init(&sh->lru); | |
5438 | /* | |
5439 | * avoid race release_stripe_plug() sees | |
5440 | * STRIPE_ON_UNPLUG_LIST clear but the stripe | |
5441 | * is still in our list | |
5442 | */ | |
4e857c58 | 5443 | smp_mb__before_atomic(); |
8811b596 | 5444 | clear_bit(STRIPE_ON_UNPLUG_LIST, &sh->state); |
773ca82f SL |
5445 | /* |
5446 | * STRIPE_ON_RELEASE_LIST could be set here. In that | |
5447 | * case, the count is always > 1 here | |
5448 | */ | |
566c09c5 SL |
5449 | hash = sh->hash_lock_index; |
5450 | __release_stripe(conf, sh, &cb->temp_inactive_list[hash]); | |
a9add5d9 | 5451 | cnt++; |
8811b596 SL |
5452 | } |
5453 | spin_unlock_irq(&conf->device_lock); | |
5454 | } | |
566c09c5 SL |
5455 | release_inactive_stripe_list(conf, cb->temp_inactive_list, |
5456 | NR_STRIPE_HASH_LOCKS); | |
e3620a3a JB |
5457 | if (mddev->queue) |
5458 | trace_block_unplug(mddev->queue, cnt, !from_schedule); | |
8811b596 SL |
5459 | kfree(cb); |
5460 | } | |
5461 | ||
5462 | static void release_stripe_plug(struct mddev *mddev, | |
5463 | struct stripe_head *sh) | |
5464 | { | |
5465 | struct blk_plug_cb *blk_cb = blk_check_plugged( | |
5466 | raid5_unplug, mddev, | |
5467 | sizeof(struct raid5_plug_cb)); | |
5468 | struct raid5_plug_cb *cb; | |
5469 | ||
5470 | if (!blk_cb) { | |
6d036f7d | 5471 | raid5_release_stripe(sh); |
8811b596 SL |
5472 | return; |
5473 | } | |
5474 | ||
5475 | cb = container_of(blk_cb, struct raid5_plug_cb, cb); | |
5476 | ||
566c09c5 SL |
5477 | if (cb->list.next == NULL) { |
5478 | int i; | |
8811b596 | 5479 | INIT_LIST_HEAD(&cb->list); |
566c09c5 SL |
5480 | for (i = 0; i < NR_STRIPE_HASH_LOCKS; i++) |
5481 | INIT_LIST_HEAD(cb->temp_inactive_list + i); | |
5482 | } | |
8811b596 SL |
5483 | |
5484 | if (!test_and_set_bit(STRIPE_ON_UNPLUG_LIST, &sh->state)) | |
5485 | list_add_tail(&sh->lru, &cb->list); | |
5486 | else | |
6d036f7d | 5487 | raid5_release_stripe(sh); |
8811b596 SL |
5488 | } |
5489 | ||
620125f2 SL |
5490 | static void make_discard_request(struct mddev *mddev, struct bio *bi) |
5491 | { | |
5492 | struct r5conf *conf = mddev->private; | |
5493 | sector_t logical_sector, last_sector; | |
5494 | struct stripe_head *sh; | |
620125f2 SL |
5495 | int stripe_sectors; |
5496 | ||
5497 | if (mddev->reshape_position != MaxSector) | |
5498 | /* Skip discard while reshape is happening */ | |
5499 | return; | |
5500 | ||
4f024f37 | 5501 | logical_sector = bi->bi_iter.bi_sector & ~((sector_t)STRIPE_SECTORS-1); |
b0f01ecf | 5502 | last_sector = bio_end_sector(bi); |
620125f2 SL |
5503 | |
5504 | bi->bi_next = NULL; | |
620125f2 SL |
5505 | |
5506 | stripe_sectors = conf->chunk_sectors * | |
5507 | (conf->raid_disks - conf->max_degraded); | |
5508 | logical_sector = DIV_ROUND_UP_SECTOR_T(logical_sector, | |
5509 | stripe_sectors); | |
5510 | sector_div(last_sector, stripe_sectors); | |
5511 | ||
5512 | logical_sector *= conf->chunk_sectors; | |
5513 | last_sector *= conf->chunk_sectors; | |
5514 | ||
5515 | for (; logical_sector < last_sector; | |
5516 | logical_sector += STRIPE_SECTORS) { | |
5517 | DEFINE_WAIT(w); | |
5518 | int d; | |
5519 | again: | |
6d036f7d | 5520 | sh = raid5_get_active_stripe(conf, logical_sector, 0, 0, 0); |
620125f2 SL |
5521 | prepare_to_wait(&conf->wait_for_overlap, &w, |
5522 | TASK_UNINTERRUPTIBLE); | |
f8dfcffd N |
5523 | set_bit(R5_Overlap, &sh->dev[sh->pd_idx].flags); |
5524 | if (test_bit(STRIPE_SYNCING, &sh->state)) { | |
6d036f7d | 5525 | raid5_release_stripe(sh); |
f8dfcffd N |
5526 | schedule(); |
5527 | goto again; | |
5528 | } | |
5529 | clear_bit(R5_Overlap, &sh->dev[sh->pd_idx].flags); | |
620125f2 SL |
5530 | spin_lock_irq(&sh->stripe_lock); |
5531 | for (d = 0; d < conf->raid_disks; d++) { | |
5532 | if (d == sh->pd_idx || d == sh->qd_idx) | |
5533 | continue; | |
5534 | if (sh->dev[d].towrite || sh->dev[d].toread) { | |
5535 | set_bit(R5_Overlap, &sh->dev[d].flags); | |
5536 | spin_unlock_irq(&sh->stripe_lock); | |
6d036f7d | 5537 | raid5_release_stripe(sh); |
620125f2 SL |
5538 | schedule(); |
5539 | goto again; | |
5540 | } | |
5541 | } | |
f8dfcffd | 5542 | set_bit(STRIPE_DISCARD, &sh->state); |
620125f2 | 5543 | finish_wait(&conf->wait_for_overlap, &w); |
7a87f434 | 5544 | sh->overwrite_disks = 0; |
620125f2 SL |
5545 | for (d = 0; d < conf->raid_disks; d++) { |
5546 | if (d == sh->pd_idx || d == sh->qd_idx) | |
5547 | continue; | |
5548 | sh->dev[d].towrite = bi; | |
5549 | set_bit(R5_OVERWRITE, &sh->dev[d].flags); | |
016c76ac | 5550 | bio_inc_remaining(bi); |
49728050 | 5551 | md_write_inc(mddev, bi); |
7a87f434 | 5552 | sh->overwrite_disks++; |
620125f2 SL |
5553 | } |
5554 | spin_unlock_irq(&sh->stripe_lock); | |
5555 | if (conf->mddev->bitmap) { | |
5556 | for (d = 0; | |
5557 | d < conf->raid_disks - conf->max_degraded; | |
5558 | d++) | |
e64e4018 AS |
5559 | md_bitmap_startwrite(mddev->bitmap, |
5560 | sh->sector, | |
5561 | STRIPE_SECTORS, | |
5562 | 0); | |
620125f2 SL |
5563 | sh->bm_seq = conf->seq_flush + 1; |
5564 | set_bit(STRIPE_BIT_DELAY, &sh->state); | |
5565 | } | |
5566 | ||
5567 | set_bit(STRIPE_HANDLE, &sh->state); | |
5568 | clear_bit(STRIPE_DELAYED, &sh->state); | |
5569 | if (!test_and_set_bit(STRIPE_PREREAD_ACTIVE, &sh->state)) | |
5570 | atomic_inc(&conf->preread_active_stripes); | |
5571 | release_stripe_plug(mddev, sh); | |
5572 | } | |
5573 | ||
016c76ac | 5574 | bio_endio(bi); |
620125f2 SL |
5575 | } |
5576 | ||
cc27b0c7 | 5577 | static bool raid5_make_request(struct mddev *mddev, struct bio * bi) |
1da177e4 | 5578 | { |
d1688a6d | 5579 | struct r5conf *conf = mddev->private; |
911d4ee8 | 5580 | int dd_idx; |
1da177e4 LT |
5581 | sector_t new_sector; |
5582 | sector_t logical_sector, last_sector; | |
5583 | struct stripe_head *sh; | |
a362357b | 5584 | const int rw = bio_data_dir(bi); |
27c0f68f SL |
5585 | DEFINE_WAIT(w); |
5586 | bool do_prepare; | |
3bddb7f8 | 5587 | bool do_flush = false; |
1da177e4 | 5588 | |
1eff9d32 | 5589 | if (unlikely(bi->bi_opf & REQ_PREFLUSH)) { |
1532d9e8 | 5590 | int ret = log_handle_flush_request(conf, bi); |
828cbe98 SL |
5591 | |
5592 | if (ret == 0) | |
cc27b0c7 | 5593 | return true; |
828cbe98 | 5594 | if (ret == -ENODEV) { |
775d7831 DJ |
5595 | if (md_flush_request(mddev, bi)) |
5596 | return true; | |
828cbe98 SL |
5597 | } |
5598 | /* ret == -EAGAIN, fallback */ | |
3bddb7f8 SL |
5599 | /* |
5600 | * if r5l_handle_flush_request() didn't clear REQ_PREFLUSH, | |
5601 | * we need to flush journal device | |
5602 | */ | |
5603 | do_flush = bi->bi_opf & REQ_PREFLUSH; | |
e5dcdd80 N |
5604 | } |
5605 | ||
cc27b0c7 N |
5606 | if (!md_write_start(mddev, bi)) |
5607 | return false; | |
9ffc8f7c EM |
5608 | /* |
5609 | * If array is degraded, better not do chunk aligned read because | |
5610 | * later we might have to read it again in order to reconstruct | |
5611 | * data on failed drives. | |
5612 | */ | |
5613 | if (rw == READ && mddev->degraded == 0 && | |
7ef6b12a ML |
5614 | mddev->reshape_position == MaxSector) { |
5615 | bi = chunk_aligned_read(mddev, bi); | |
5616 | if (!bi) | |
cc27b0c7 | 5617 | return true; |
7ef6b12a | 5618 | } |
52488615 | 5619 | |
796a5cf0 | 5620 | if (unlikely(bio_op(bi) == REQ_OP_DISCARD)) { |
620125f2 | 5621 | make_discard_request(mddev, bi); |
cc27b0c7 N |
5622 | md_write_end(mddev); |
5623 | return true; | |
620125f2 SL |
5624 | } |
5625 | ||
4f024f37 | 5626 | logical_sector = bi->bi_iter.bi_sector & ~((sector_t)STRIPE_SECTORS-1); |
f73a1c7d | 5627 | last_sector = bio_end_sector(bi); |
1da177e4 | 5628 | bi->bi_next = NULL; |
06d91a5f | 5629 | |
27c0f68f | 5630 | prepare_to_wait(&conf->wait_for_overlap, &w, TASK_UNINTERRUPTIBLE); |
1da177e4 | 5631 | for (;logical_sector < last_sector; logical_sector += STRIPE_SECTORS) { |
b5663ba4 | 5632 | int previous; |
c46501b2 | 5633 | int seq; |
b578d55f | 5634 | |
27c0f68f | 5635 | do_prepare = false; |
7ecaa1e6 | 5636 | retry: |
c46501b2 | 5637 | seq = read_seqcount_begin(&conf->gen_lock); |
b5663ba4 | 5638 | previous = 0; |
27c0f68f SL |
5639 | if (do_prepare) |
5640 | prepare_to_wait(&conf->wait_for_overlap, &w, | |
5641 | TASK_UNINTERRUPTIBLE); | |
b0f9ec04 | 5642 | if (unlikely(conf->reshape_progress != MaxSector)) { |
fef9c61f | 5643 | /* spinlock is needed as reshape_progress may be |
df8e7f76 N |
5644 | * 64bit on a 32bit platform, and so it might be |
5645 | * possible to see a half-updated value | |
aeb878b0 | 5646 | * Of course reshape_progress could change after |
df8e7f76 N |
5647 | * the lock is dropped, so once we get a reference |
5648 | * to the stripe that we think it is, we will have | |
5649 | * to check again. | |
5650 | */ | |
7ecaa1e6 | 5651 | spin_lock_irq(&conf->device_lock); |
2c810cdd | 5652 | if (mddev->reshape_backwards |
fef9c61f N |
5653 | ? logical_sector < conf->reshape_progress |
5654 | : logical_sector >= conf->reshape_progress) { | |
b5663ba4 N |
5655 | previous = 1; |
5656 | } else { | |
2c810cdd | 5657 | if (mddev->reshape_backwards |
fef9c61f N |
5658 | ? logical_sector < conf->reshape_safe |
5659 | : logical_sector >= conf->reshape_safe) { | |
b578d55f N |
5660 | spin_unlock_irq(&conf->device_lock); |
5661 | schedule(); | |
27c0f68f | 5662 | do_prepare = true; |
b578d55f N |
5663 | goto retry; |
5664 | } | |
5665 | } | |
7ecaa1e6 N |
5666 | spin_unlock_irq(&conf->device_lock); |
5667 | } | |
16a53ecc | 5668 | |
112bf897 N |
5669 | new_sector = raid5_compute_sector(conf, logical_sector, |
5670 | previous, | |
911d4ee8 | 5671 | &dd_idx, NULL); |
849674e4 | 5672 | pr_debug("raid456: raid5_make_request, sector %llu logical %llu\n", |
c46501b2 | 5673 | (unsigned long long)new_sector, |
1da177e4 LT |
5674 | (unsigned long long)logical_sector); |
5675 | ||
6d036f7d | 5676 | sh = raid5_get_active_stripe(conf, new_sector, previous, |
1eff9d32 | 5677 | (bi->bi_opf & REQ_RAHEAD), 0); |
1da177e4 | 5678 | if (sh) { |
b0f9ec04 | 5679 | if (unlikely(previous)) { |
7ecaa1e6 | 5680 | /* expansion might have moved on while waiting for a |
df8e7f76 N |
5681 | * stripe, so we must do the range check again. |
5682 | * Expansion could still move past after this | |
5683 | * test, but as we are holding a reference to | |
5684 | * 'sh', we know that if that happens, | |
5685 | * STRIPE_EXPANDING will get set and the expansion | |
5686 | * won't proceed until we finish with the stripe. | |
7ecaa1e6 N |
5687 | */ |
5688 | int must_retry = 0; | |
5689 | spin_lock_irq(&conf->device_lock); | |
2c810cdd | 5690 | if (mddev->reshape_backwards |
b0f9ec04 N |
5691 | ? logical_sector >= conf->reshape_progress |
5692 | : logical_sector < conf->reshape_progress) | |
7ecaa1e6 N |
5693 | /* mismatch, need to try again */ |
5694 | must_retry = 1; | |
5695 | spin_unlock_irq(&conf->device_lock); | |
5696 | if (must_retry) { | |
6d036f7d | 5697 | raid5_release_stripe(sh); |
7a3ab908 | 5698 | schedule(); |
27c0f68f | 5699 | do_prepare = true; |
7ecaa1e6 N |
5700 | goto retry; |
5701 | } | |
5702 | } | |
c46501b2 N |
5703 | if (read_seqcount_retry(&conf->gen_lock, seq)) { |
5704 | /* Might have got the wrong stripe_head | |
5705 | * by accident | |
5706 | */ | |
6d036f7d | 5707 | raid5_release_stripe(sh); |
c46501b2 N |
5708 | goto retry; |
5709 | } | |
e62e58a5 | 5710 | |
7ecaa1e6 | 5711 | if (test_bit(STRIPE_EXPANDING, &sh->state) || |
da41ba65 | 5712 | !add_stripe_bio(sh, bi, dd_idx, rw, previous)) { |
7ecaa1e6 N |
5713 | /* Stripe is busy expanding or |
5714 | * add failed due to overlap. Flush everything | |
1da177e4 LT |
5715 | * and wait a while |
5716 | */ | |
482c0834 | 5717 | md_wakeup_thread(mddev->thread); |
6d036f7d | 5718 | raid5_release_stripe(sh); |
1da177e4 | 5719 | schedule(); |
27c0f68f | 5720 | do_prepare = true; |
1da177e4 LT |
5721 | goto retry; |
5722 | } | |
3bddb7f8 SL |
5723 | if (do_flush) { |
5724 | set_bit(STRIPE_R5C_PREFLUSH, &sh->state); | |
5725 | /* we only need flush for one stripe */ | |
5726 | do_flush = false; | |
5727 | } | |
5728 | ||
6ce220dd GJ |
5729 | if (!sh->batch_head) |
5730 | set_bit(STRIPE_HANDLE, &sh->state); | |
6ed3003c | 5731 | clear_bit(STRIPE_DELAYED, &sh->state); |
59fc630b | 5732 | if ((!sh->batch_head || sh == sh->batch_head) && |
1eff9d32 | 5733 | (bi->bi_opf & REQ_SYNC) && |
729a1866 N |
5734 | !test_and_set_bit(STRIPE_PREREAD_ACTIVE, &sh->state)) |
5735 | atomic_inc(&conf->preread_active_stripes); | |
8811b596 | 5736 | release_stripe_plug(mddev, sh); |
1da177e4 LT |
5737 | } else { |
5738 | /* cannot get stripe for read-ahead, just give-up */ | |
4e4cbee9 | 5739 | bi->bi_status = BLK_STS_IOERR; |
1da177e4 LT |
5740 | break; |
5741 | } | |
1da177e4 | 5742 | } |
27c0f68f | 5743 | finish_wait(&conf->wait_for_overlap, &w); |
7c13edc8 | 5744 | |
49728050 N |
5745 | if (rw == WRITE) |
5746 | md_write_end(mddev); | |
016c76ac | 5747 | bio_endio(bi); |
cc27b0c7 | 5748 | return true; |
1da177e4 LT |
5749 | } |
5750 | ||
fd01b88c | 5751 | static sector_t raid5_size(struct mddev *mddev, sector_t sectors, int raid_disks); |
b522adcd | 5752 | |
fd01b88c | 5753 | static sector_t reshape_request(struct mddev *mddev, sector_t sector_nr, int *skipped) |
1da177e4 | 5754 | { |
52c03291 N |
5755 | /* reshaping is quite different to recovery/resync so it is |
5756 | * handled quite separately ... here. | |
5757 | * | |
5758 | * On each call to sync_request, we gather one chunk worth of | |
5759 | * destination stripes and flag them as expanding. | |
5760 | * Then we find all the source stripes and request reads. | |
5761 | * As the reads complete, handle_stripe will copy the data | |
5762 | * into the destination stripe and release that stripe. | |
5763 | */ | |
d1688a6d | 5764 | struct r5conf *conf = mddev->private; |
1da177e4 | 5765 | struct stripe_head *sh; |
db0505d3 | 5766 | struct md_rdev *rdev; |
ccfcc3c1 | 5767 | sector_t first_sector, last_sector; |
f416885e N |
5768 | int raid_disks = conf->previous_raid_disks; |
5769 | int data_disks = raid_disks - conf->max_degraded; | |
5770 | int new_data_disks = conf->raid_disks - conf->max_degraded; | |
52c03291 N |
5771 | int i; |
5772 | int dd_idx; | |
c8f517c4 | 5773 | sector_t writepos, readpos, safepos; |
ec32a2bd | 5774 | sector_t stripe_addr; |
7a661381 | 5775 | int reshape_sectors; |
ab69ae12 | 5776 | struct list_head stripes; |
92140480 | 5777 | sector_t retn; |
52c03291 | 5778 | |
fef9c61f N |
5779 | if (sector_nr == 0) { |
5780 | /* If restarting in the middle, skip the initial sectors */ | |
2c810cdd | 5781 | if (mddev->reshape_backwards && |
fef9c61f N |
5782 | conf->reshape_progress < raid5_size(mddev, 0, 0)) { |
5783 | sector_nr = raid5_size(mddev, 0, 0) | |
5784 | - conf->reshape_progress; | |
6cbd8148 N |
5785 | } else if (mddev->reshape_backwards && |
5786 | conf->reshape_progress == MaxSector) { | |
5787 | /* shouldn't happen, but just in case, finish up.*/ | |
5788 | sector_nr = MaxSector; | |
2c810cdd | 5789 | } else if (!mddev->reshape_backwards && |
fef9c61f N |
5790 | conf->reshape_progress > 0) |
5791 | sector_nr = conf->reshape_progress; | |
f416885e | 5792 | sector_div(sector_nr, new_data_disks); |
fef9c61f | 5793 | if (sector_nr) { |
8dee7211 N |
5794 | mddev->curr_resync_completed = sector_nr; |
5795 | sysfs_notify(&mddev->kobj, NULL, "sync_completed"); | |
fef9c61f | 5796 | *skipped = 1; |
92140480 N |
5797 | retn = sector_nr; |
5798 | goto finish; | |
fef9c61f | 5799 | } |
52c03291 N |
5800 | } |
5801 | ||
7a661381 N |
5802 | /* We need to process a full chunk at a time. |
5803 | * If old and new chunk sizes differ, we need to process the | |
5804 | * largest of these | |
5805 | */ | |
3cb5edf4 N |
5806 | |
5807 | reshape_sectors = max(conf->chunk_sectors, conf->prev_chunk_sectors); | |
7a661381 | 5808 | |
b5254dd5 N |
5809 | /* We update the metadata at least every 10 seconds, or when |
5810 | * the data about to be copied would over-write the source of | |
5811 | * the data at the front of the range. i.e. one new_stripe | |
5812 | * along from reshape_progress new_maps to after where | |
5813 | * reshape_safe old_maps to | |
52c03291 | 5814 | */ |
fef9c61f | 5815 | writepos = conf->reshape_progress; |
f416885e | 5816 | sector_div(writepos, new_data_disks); |
c8f517c4 N |
5817 | readpos = conf->reshape_progress; |
5818 | sector_div(readpos, data_disks); | |
fef9c61f | 5819 | safepos = conf->reshape_safe; |
f416885e | 5820 | sector_div(safepos, data_disks); |
2c810cdd | 5821 | if (mddev->reshape_backwards) { |
c74c0d76 N |
5822 | BUG_ON(writepos < reshape_sectors); |
5823 | writepos -= reshape_sectors; | |
c8f517c4 | 5824 | readpos += reshape_sectors; |
7a661381 | 5825 | safepos += reshape_sectors; |
fef9c61f | 5826 | } else { |
7a661381 | 5827 | writepos += reshape_sectors; |
c74c0d76 N |
5828 | /* readpos and safepos are worst-case calculations. |
5829 | * A negative number is overly pessimistic, and causes | |
5830 | * obvious problems for unsigned storage. So clip to 0. | |
5831 | */ | |
ed37d83e N |
5832 | readpos -= min_t(sector_t, reshape_sectors, readpos); |
5833 | safepos -= min_t(sector_t, reshape_sectors, safepos); | |
fef9c61f | 5834 | } |
52c03291 | 5835 | |
b5254dd5 N |
5836 | /* Having calculated the 'writepos' possibly use it |
5837 | * to set 'stripe_addr' which is where we will write to. | |
5838 | */ | |
5839 | if (mddev->reshape_backwards) { | |
5840 | BUG_ON(conf->reshape_progress == 0); | |
5841 | stripe_addr = writepos; | |
5842 | BUG_ON((mddev->dev_sectors & | |
5843 | ~((sector_t)reshape_sectors - 1)) | |
5844 | - reshape_sectors - stripe_addr | |
5845 | != sector_nr); | |
5846 | } else { | |
5847 | BUG_ON(writepos != sector_nr + reshape_sectors); | |
5848 | stripe_addr = sector_nr; | |
5849 | } | |
5850 | ||
c8f517c4 N |
5851 | /* 'writepos' is the most advanced device address we might write. |
5852 | * 'readpos' is the least advanced device address we might read. | |
5853 | * 'safepos' is the least address recorded in the metadata as having | |
5854 | * been reshaped. | |
b5254dd5 N |
5855 | * If there is a min_offset_diff, these are adjusted either by |
5856 | * increasing the safepos/readpos if diff is negative, or | |
5857 | * increasing writepos if diff is positive. | |
5858 | * If 'readpos' is then behind 'writepos', there is no way that we can | |
c8f517c4 N |
5859 | * ensure safety in the face of a crash - that must be done by userspace |
5860 | * making a backup of the data. So in that case there is no particular | |
5861 | * rush to update metadata. | |
5862 | * Otherwise if 'safepos' is behind 'writepos', then we really need to | |
5863 | * update the metadata to advance 'safepos' to match 'readpos' so that | |
5864 | * we can be safe in the event of a crash. | |
5865 | * So we insist on updating metadata if safepos is behind writepos and | |
5866 | * readpos is beyond writepos. | |
5867 | * In any case, update the metadata every 10 seconds. | |
5868 | * Maybe that number should be configurable, but I'm not sure it is | |
5869 | * worth it.... maybe it could be a multiple of safemode_delay??? | |
5870 | */ | |
b5254dd5 N |
5871 | if (conf->min_offset_diff < 0) { |
5872 | safepos += -conf->min_offset_diff; | |
5873 | readpos += -conf->min_offset_diff; | |
5874 | } else | |
5875 | writepos += conf->min_offset_diff; | |
5876 | ||
2c810cdd | 5877 | if ((mddev->reshape_backwards |
c8f517c4 N |
5878 | ? (safepos > writepos && readpos < writepos) |
5879 | : (safepos < writepos && readpos > writepos)) || | |
5880 | time_after(jiffies, conf->reshape_checkpoint + 10*HZ)) { | |
52c03291 N |
5881 | /* Cannot proceed until we've updated the superblock... */ |
5882 | wait_event(conf->wait_for_overlap, | |
c91abf5a N |
5883 | atomic_read(&conf->reshape_stripes)==0 |
5884 | || test_bit(MD_RECOVERY_INTR, &mddev->recovery)); | |
5885 | if (atomic_read(&conf->reshape_stripes) != 0) | |
5886 | return 0; | |
fef9c61f | 5887 | mddev->reshape_position = conf->reshape_progress; |
75d3da43 | 5888 | mddev->curr_resync_completed = sector_nr; |
db0505d3 N |
5889 | if (!mddev->reshape_backwards) |
5890 | /* Can update recovery_offset */ | |
5891 | rdev_for_each(rdev, mddev) | |
5892 | if (rdev->raid_disk >= 0 && | |
5893 | !test_bit(Journal, &rdev->flags) && | |
5894 | !test_bit(In_sync, &rdev->flags) && | |
5895 | rdev->recovery_offset < sector_nr) | |
5896 | rdev->recovery_offset = sector_nr; | |
5897 | ||
c8f517c4 | 5898 | conf->reshape_checkpoint = jiffies; |
2953079c | 5899 | set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags); |
52c03291 | 5900 | md_wakeup_thread(mddev->thread); |
2953079c | 5901 | wait_event(mddev->sb_wait, mddev->sb_flags == 0 || |
c91abf5a N |
5902 | test_bit(MD_RECOVERY_INTR, &mddev->recovery)); |
5903 | if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) | |
5904 | return 0; | |
52c03291 | 5905 | spin_lock_irq(&conf->device_lock); |
fef9c61f | 5906 | conf->reshape_safe = mddev->reshape_position; |
52c03291 N |
5907 | spin_unlock_irq(&conf->device_lock); |
5908 | wake_up(&conf->wait_for_overlap); | |
acb180b0 | 5909 | sysfs_notify(&mddev->kobj, NULL, "sync_completed"); |
52c03291 N |
5910 | } |
5911 | ||
ab69ae12 | 5912 | INIT_LIST_HEAD(&stripes); |
7a661381 | 5913 | for (i = 0; i < reshape_sectors; i += STRIPE_SECTORS) { |
52c03291 | 5914 | int j; |
a9f326eb | 5915 | int skipped_disk = 0; |
6d036f7d | 5916 | sh = raid5_get_active_stripe(conf, stripe_addr+i, 0, 0, 1); |
52c03291 N |
5917 | set_bit(STRIPE_EXPANDING, &sh->state); |
5918 | atomic_inc(&conf->reshape_stripes); | |
5919 | /* If any of this stripe is beyond the end of the old | |
5920 | * array, then we need to zero those blocks | |
5921 | */ | |
5922 | for (j=sh->disks; j--;) { | |
5923 | sector_t s; | |
5924 | if (j == sh->pd_idx) | |
5925 | continue; | |
f416885e | 5926 | if (conf->level == 6 && |
d0dabf7e | 5927 | j == sh->qd_idx) |
f416885e | 5928 | continue; |
6d036f7d | 5929 | s = raid5_compute_blocknr(sh, j, 0); |
b522adcd | 5930 | if (s < raid5_size(mddev, 0, 0)) { |
a9f326eb | 5931 | skipped_disk = 1; |
52c03291 N |
5932 | continue; |
5933 | } | |
5934 | memset(page_address(sh->dev[j].page), 0, STRIPE_SIZE); | |
5935 | set_bit(R5_Expanded, &sh->dev[j].flags); | |
5936 | set_bit(R5_UPTODATE, &sh->dev[j].flags); | |
5937 | } | |
a9f326eb | 5938 | if (!skipped_disk) { |
52c03291 N |
5939 | set_bit(STRIPE_EXPAND_READY, &sh->state); |
5940 | set_bit(STRIPE_HANDLE, &sh->state); | |
5941 | } | |
ab69ae12 | 5942 | list_add(&sh->lru, &stripes); |
52c03291 N |
5943 | } |
5944 | spin_lock_irq(&conf->device_lock); | |
2c810cdd | 5945 | if (mddev->reshape_backwards) |
7a661381 | 5946 | conf->reshape_progress -= reshape_sectors * new_data_disks; |
fef9c61f | 5947 | else |
7a661381 | 5948 | conf->reshape_progress += reshape_sectors * new_data_disks; |
52c03291 N |
5949 | spin_unlock_irq(&conf->device_lock); |
5950 | /* Ok, those stripe are ready. We can start scheduling | |
5951 | * reads on the source stripes. | |
5952 | * The source stripes are determined by mapping the first and last | |
5953 | * block on the destination stripes. | |
5954 | */ | |
52c03291 | 5955 | first_sector = |
ec32a2bd | 5956 | raid5_compute_sector(conf, stripe_addr*(new_data_disks), |
911d4ee8 | 5957 | 1, &dd_idx, NULL); |
52c03291 | 5958 | last_sector = |
0e6e0271 | 5959 | raid5_compute_sector(conf, ((stripe_addr+reshape_sectors) |
09c9e5fa | 5960 | * new_data_disks - 1), |
911d4ee8 | 5961 | 1, &dd_idx, NULL); |
58c0fed4 AN |
5962 | if (last_sector >= mddev->dev_sectors) |
5963 | last_sector = mddev->dev_sectors - 1; | |
52c03291 | 5964 | while (first_sector <= last_sector) { |
6d036f7d | 5965 | sh = raid5_get_active_stripe(conf, first_sector, 1, 0, 1); |
52c03291 N |
5966 | set_bit(STRIPE_EXPAND_SOURCE, &sh->state); |
5967 | set_bit(STRIPE_HANDLE, &sh->state); | |
6d036f7d | 5968 | raid5_release_stripe(sh); |
52c03291 N |
5969 | first_sector += STRIPE_SECTORS; |
5970 | } | |
ab69ae12 N |
5971 | /* Now that the sources are clearly marked, we can release |
5972 | * the destination stripes | |
5973 | */ | |
5974 | while (!list_empty(&stripes)) { | |
5975 | sh = list_entry(stripes.next, struct stripe_head, lru); | |
5976 | list_del_init(&sh->lru); | |
6d036f7d | 5977 | raid5_release_stripe(sh); |
ab69ae12 | 5978 | } |
c6207277 N |
5979 | /* If this takes us to the resync_max point where we have to pause, |
5980 | * then we need to write out the superblock. | |
5981 | */ | |
7a661381 | 5982 | sector_nr += reshape_sectors; |
92140480 N |
5983 | retn = reshape_sectors; |
5984 | finish: | |
c5e19d90 N |
5985 | if (mddev->curr_resync_completed > mddev->resync_max || |
5986 | (sector_nr - mddev->curr_resync_completed) * 2 | |
c03f6a19 | 5987 | >= mddev->resync_max - mddev->curr_resync_completed) { |
c6207277 N |
5988 | /* Cannot proceed until we've updated the superblock... */ |
5989 | wait_event(conf->wait_for_overlap, | |
c91abf5a N |
5990 | atomic_read(&conf->reshape_stripes) == 0 |
5991 | || test_bit(MD_RECOVERY_INTR, &mddev->recovery)); | |
5992 | if (atomic_read(&conf->reshape_stripes) != 0) | |
5993 | goto ret; | |
fef9c61f | 5994 | mddev->reshape_position = conf->reshape_progress; |
75d3da43 | 5995 | mddev->curr_resync_completed = sector_nr; |
db0505d3 N |
5996 | if (!mddev->reshape_backwards) |
5997 | /* Can update recovery_offset */ | |
5998 | rdev_for_each(rdev, mddev) | |
5999 | if (rdev->raid_disk >= 0 && | |
6000 | !test_bit(Journal, &rdev->flags) && | |
6001 | !test_bit(In_sync, &rdev->flags) && | |
6002 | rdev->recovery_offset < sector_nr) | |
6003 | rdev->recovery_offset = sector_nr; | |
c8f517c4 | 6004 | conf->reshape_checkpoint = jiffies; |
2953079c | 6005 | set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags); |
c6207277 N |
6006 | md_wakeup_thread(mddev->thread); |
6007 | wait_event(mddev->sb_wait, | |
2953079c | 6008 | !test_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags) |
c91abf5a N |
6009 | || test_bit(MD_RECOVERY_INTR, &mddev->recovery)); |
6010 | if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) | |
6011 | goto ret; | |
c6207277 | 6012 | spin_lock_irq(&conf->device_lock); |
fef9c61f | 6013 | conf->reshape_safe = mddev->reshape_position; |
c6207277 N |
6014 | spin_unlock_irq(&conf->device_lock); |
6015 | wake_up(&conf->wait_for_overlap); | |
acb180b0 | 6016 | sysfs_notify(&mddev->kobj, NULL, "sync_completed"); |
c6207277 | 6017 | } |
c91abf5a | 6018 | ret: |
92140480 | 6019 | return retn; |
52c03291 N |
6020 | } |
6021 | ||
849674e4 SL |
6022 | static inline sector_t raid5_sync_request(struct mddev *mddev, sector_t sector_nr, |
6023 | int *skipped) | |
52c03291 | 6024 | { |
d1688a6d | 6025 | struct r5conf *conf = mddev->private; |
52c03291 | 6026 | struct stripe_head *sh; |
58c0fed4 | 6027 | sector_t max_sector = mddev->dev_sectors; |
57dab0bd | 6028 | sector_t sync_blocks; |
16a53ecc N |
6029 | int still_degraded = 0; |
6030 | int i; | |
1da177e4 | 6031 | |
72626685 | 6032 | if (sector_nr >= max_sector) { |
1da177e4 | 6033 | /* just being told to finish up .. nothing much to do */ |
cea9c228 | 6034 | |
29269553 N |
6035 | if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)) { |
6036 | end_reshape(conf); | |
6037 | return 0; | |
6038 | } | |
72626685 N |
6039 | |
6040 | if (mddev->curr_resync < max_sector) /* aborted */ | |
e64e4018 AS |
6041 | md_bitmap_end_sync(mddev->bitmap, mddev->curr_resync, |
6042 | &sync_blocks, 1); | |
16a53ecc | 6043 | else /* completed sync */ |
72626685 | 6044 | conf->fullsync = 0; |
e64e4018 | 6045 | md_bitmap_close_sync(mddev->bitmap); |
72626685 | 6046 | |
1da177e4 LT |
6047 | return 0; |
6048 | } | |
ccfcc3c1 | 6049 | |
64bd660b N |
6050 | /* Allow raid5_quiesce to complete */ |
6051 | wait_event(conf->wait_for_overlap, conf->quiesce != 2); | |
6052 | ||
52c03291 N |
6053 | if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)) |
6054 | return reshape_request(mddev, sector_nr, skipped); | |
f6705578 | 6055 | |
c6207277 N |
6056 | /* No need to check resync_max as we never do more than one |
6057 | * stripe, and as resync_max will always be on a chunk boundary, | |
6058 | * if the check in md_do_sync didn't fire, there is no chance | |
6059 | * of overstepping resync_max here | |
6060 | */ | |
6061 | ||
16a53ecc | 6062 | /* if there is too many failed drives and we are trying |
1da177e4 LT |
6063 | * to resync, then assert that we are finished, because there is |
6064 | * nothing we can do. | |
6065 | */ | |
3285edf1 | 6066 | if (mddev->degraded >= conf->max_degraded && |
16a53ecc | 6067 | test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) { |
58c0fed4 | 6068 | sector_t rv = mddev->dev_sectors - sector_nr; |
57afd89f | 6069 | *skipped = 1; |
1da177e4 LT |
6070 | return rv; |
6071 | } | |
6f608040 | 6072 | if (!test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery) && |
6073 | !conf->fullsync && | |
e64e4018 | 6074 | !md_bitmap_start_sync(mddev->bitmap, sector_nr, &sync_blocks, 1) && |
6f608040 | 6075 | sync_blocks >= STRIPE_SECTORS) { |
72626685 N |
6076 | /* we can skip this block, and probably more */ |
6077 | sync_blocks /= STRIPE_SECTORS; | |
6078 | *skipped = 1; | |
6079 | return sync_blocks * STRIPE_SECTORS; /* keep things rounded to whole stripes */ | |
6080 | } | |
1da177e4 | 6081 | |
e64e4018 | 6082 | md_bitmap_cond_end_sync(mddev->bitmap, sector_nr, false); |
b47490c9 | 6083 | |
6d036f7d | 6084 | sh = raid5_get_active_stripe(conf, sector_nr, 0, 1, 0); |
1da177e4 | 6085 | if (sh == NULL) { |
6d036f7d | 6086 | sh = raid5_get_active_stripe(conf, sector_nr, 0, 0, 0); |
1da177e4 | 6087 | /* make sure we don't swamp the stripe cache if someone else |
16a53ecc | 6088 | * is trying to get access |
1da177e4 | 6089 | */ |
66c006a5 | 6090 | schedule_timeout_uninterruptible(1); |
1da177e4 | 6091 | } |
16a53ecc | 6092 | /* Need to check if array will still be degraded after recovery/resync |
16d9cfab EM |
6093 | * Note in case of > 1 drive failures it's possible we're rebuilding |
6094 | * one drive while leaving another faulty drive in array. | |
16a53ecc | 6095 | */ |
16d9cfab EM |
6096 | rcu_read_lock(); |
6097 | for (i = 0; i < conf->raid_disks; i++) { | |
6aa7de05 | 6098 | struct md_rdev *rdev = READ_ONCE(conf->disks[i].rdev); |
16d9cfab EM |
6099 | |
6100 | if (rdev == NULL || test_bit(Faulty, &rdev->flags)) | |
16a53ecc | 6101 | still_degraded = 1; |
16d9cfab EM |
6102 | } |
6103 | rcu_read_unlock(); | |
16a53ecc | 6104 | |
e64e4018 | 6105 | md_bitmap_start_sync(mddev->bitmap, sector_nr, &sync_blocks, still_degraded); |
16a53ecc | 6106 | |
83206d66 | 6107 | set_bit(STRIPE_SYNC_REQUESTED, &sh->state); |
053f5b65 | 6108 | set_bit(STRIPE_HANDLE, &sh->state); |
1da177e4 | 6109 | |
6d036f7d | 6110 | raid5_release_stripe(sh); |
1da177e4 LT |
6111 | |
6112 | return STRIPE_SECTORS; | |
6113 | } | |
6114 | ||
0472a42b N |
6115 | static int retry_aligned_read(struct r5conf *conf, struct bio *raid_bio, |
6116 | unsigned int offset) | |
46031f9a RBJ |
6117 | { |
6118 | /* We may not be able to submit a whole bio at once as there | |
6119 | * may not be enough stripe_heads available. | |
6120 | * We cannot pre-allocate enough stripe_heads as we may need | |
6121 | * more than exist in the cache (if we allow ever large chunks). | |
6122 | * So we do one stripe head at a time and record in | |
6123 | * ->bi_hw_segments how many have been done. | |
6124 | * | |
6125 | * We *know* that this entire raid_bio is in one chunk, so | |
6126 | * it will be only one 'dd_idx' and only need one call to raid5_compute_sector. | |
6127 | */ | |
6128 | struct stripe_head *sh; | |
911d4ee8 | 6129 | int dd_idx; |
46031f9a RBJ |
6130 | sector_t sector, logical_sector, last_sector; |
6131 | int scnt = 0; | |
46031f9a RBJ |
6132 | int handled = 0; |
6133 | ||
4f024f37 KO |
6134 | logical_sector = raid_bio->bi_iter.bi_sector & |
6135 | ~((sector_t)STRIPE_SECTORS-1); | |
112bf897 | 6136 | sector = raid5_compute_sector(conf, logical_sector, |
911d4ee8 | 6137 | 0, &dd_idx, NULL); |
f73a1c7d | 6138 | last_sector = bio_end_sector(raid_bio); |
46031f9a RBJ |
6139 | |
6140 | for (; logical_sector < last_sector; | |
387bb173 NB |
6141 | logical_sector += STRIPE_SECTORS, |
6142 | sector += STRIPE_SECTORS, | |
6143 | scnt++) { | |
46031f9a | 6144 | |
0472a42b | 6145 | if (scnt < offset) |
46031f9a RBJ |
6146 | /* already done this stripe */ |
6147 | continue; | |
6148 | ||
6d036f7d | 6149 | sh = raid5_get_active_stripe(conf, sector, 0, 1, 1); |
46031f9a RBJ |
6150 | |
6151 | if (!sh) { | |
6152 | /* failed to get a stripe - must wait */ | |
46031f9a | 6153 | conf->retry_read_aligned = raid_bio; |
0472a42b | 6154 | conf->retry_read_offset = scnt; |
46031f9a RBJ |
6155 | return handled; |
6156 | } | |
6157 | ||
da41ba65 | 6158 | if (!add_stripe_bio(sh, raid_bio, dd_idx, 0, 0)) { |
6d036f7d | 6159 | raid5_release_stripe(sh); |
387bb173 | 6160 | conf->retry_read_aligned = raid_bio; |
0472a42b | 6161 | conf->retry_read_offset = scnt; |
387bb173 NB |
6162 | return handled; |
6163 | } | |
6164 | ||
3f9e7c14 | 6165 | set_bit(R5_ReadNoMerge, &sh->dev[dd_idx].flags); |
36d1c647 | 6166 | handle_stripe(sh); |
6d036f7d | 6167 | raid5_release_stripe(sh); |
46031f9a RBJ |
6168 | handled++; |
6169 | } | |
016c76ac N |
6170 | |
6171 | bio_endio(raid_bio); | |
6172 | ||
46031f9a | 6173 | if (atomic_dec_and_test(&conf->active_aligned_reads)) |
b1b46486 | 6174 | wake_up(&conf->wait_for_quiescent); |
46031f9a RBJ |
6175 | return handled; |
6176 | } | |
6177 | ||
bfc90cb0 | 6178 | static int handle_active_stripes(struct r5conf *conf, int group, |
566c09c5 SL |
6179 | struct r5worker *worker, |
6180 | struct list_head *temp_inactive_list) | |
efcd487c CH |
6181 | __releases(&conf->device_lock) |
6182 | __acquires(&conf->device_lock) | |
46a06401 SL |
6183 | { |
6184 | struct stripe_head *batch[MAX_STRIPE_BATCH], *sh; | |
566c09c5 SL |
6185 | int i, batch_size = 0, hash; |
6186 | bool release_inactive = false; | |
46a06401 SL |
6187 | |
6188 | while (batch_size < MAX_STRIPE_BATCH && | |
851c30c9 | 6189 | (sh = __get_priority_stripe(conf, group)) != NULL) |
46a06401 SL |
6190 | batch[batch_size++] = sh; |
6191 | ||
566c09c5 SL |
6192 | if (batch_size == 0) { |
6193 | for (i = 0; i < NR_STRIPE_HASH_LOCKS; i++) | |
6194 | if (!list_empty(temp_inactive_list + i)) | |
6195 | break; | |
a8c34f91 SL |
6196 | if (i == NR_STRIPE_HASH_LOCKS) { |
6197 | spin_unlock_irq(&conf->device_lock); | |
1532d9e8 | 6198 | log_flush_stripe_to_raid(conf); |
a8c34f91 | 6199 | spin_lock_irq(&conf->device_lock); |
566c09c5 | 6200 | return batch_size; |
a8c34f91 | 6201 | } |
566c09c5 SL |
6202 | release_inactive = true; |
6203 | } | |
46a06401 SL |
6204 | spin_unlock_irq(&conf->device_lock); |
6205 | ||
566c09c5 SL |
6206 | release_inactive_stripe_list(conf, temp_inactive_list, |
6207 | NR_STRIPE_HASH_LOCKS); | |
6208 | ||
a8c34f91 | 6209 | r5l_flush_stripe_to_raid(conf->log); |
566c09c5 SL |
6210 | if (release_inactive) { |
6211 | spin_lock_irq(&conf->device_lock); | |
6212 | return 0; | |
6213 | } | |
6214 | ||
46a06401 SL |
6215 | for (i = 0; i < batch_size; i++) |
6216 | handle_stripe(batch[i]); | |
ff875738 | 6217 | log_write_stripe_run(conf); |
46a06401 SL |
6218 | |
6219 | cond_resched(); | |
6220 | ||
6221 | spin_lock_irq(&conf->device_lock); | |
566c09c5 SL |
6222 | for (i = 0; i < batch_size; i++) { |
6223 | hash = batch[i]->hash_lock_index; | |
6224 | __release_stripe(conf, batch[i], &temp_inactive_list[hash]); | |
6225 | } | |
46a06401 SL |
6226 | return batch_size; |
6227 | } | |
46031f9a | 6228 | |
851c30c9 SL |
6229 | static void raid5_do_work(struct work_struct *work) |
6230 | { | |
6231 | struct r5worker *worker = container_of(work, struct r5worker, work); | |
6232 | struct r5worker_group *group = worker->group; | |
6233 | struct r5conf *conf = group->conf; | |
16d997b7 | 6234 | struct mddev *mddev = conf->mddev; |
851c30c9 SL |
6235 | int group_id = group - conf->worker_groups; |
6236 | int handled; | |
6237 | struct blk_plug plug; | |
6238 | ||
6239 | pr_debug("+++ raid5worker active\n"); | |
6240 | ||
6241 | blk_start_plug(&plug); | |
6242 | handled = 0; | |
6243 | spin_lock_irq(&conf->device_lock); | |
6244 | while (1) { | |
6245 | int batch_size, released; | |
6246 | ||
566c09c5 | 6247 | released = release_stripe_list(conf, worker->temp_inactive_list); |
851c30c9 | 6248 | |
566c09c5 SL |
6249 | batch_size = handle_active_stripes(conf, group_id, worker, |
6250 | worker->temp_inactive_list); | |
bfc90cb0 | 6251 | worker->working = false; |
851c30c9 SL |
6252 | if (!batch_size && !released) |
6253 | break; | |
6254 | handled += batch_size; | |
16d997b7 N |
6255 | wait_event_lock_irq(mddev->sb_wait, |
6256 | !test_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags), | |
6257 | conf->device_lock); | |
851c30c9 SL |
6258 | } |
6259 | pr_debug("%d stripes handled\n", handled); | |
6260 | ||
6261 | spin_unlock_irq(&conf->device_lock); | |
7e96d559 | 6262 | |
9c72a18e SL |
6263 | flush_deferred_bios(conf); |
6264 | ||
6265 | r5l_flush_stripe_to_raid(conf->log); | |
6266 | ||
7e96d559 | 6267 | async_tx_issue_pending_all(); |
851c30c9 SL |
6268 | blk_finish_plug(&plug); |
6269 | ||
6270 | pr_debug("--- raid5worker inactive\n"); | |
6271 | } | |
6272 | ||
1da177e4 LT |
6273 | /* |
6274 | * This is our raid5 kernel thread. | |
6275 | * | |
6276 | * We scan the hash table for stripes which can be handled now. | |
6277 | * During the scan, completed stripes are saved for us by the interrupt | |
6278 | * handler, so that they will not have to wait for our next wakeup. | |
6279 | */ | |
4ed8731d | 6280 | static void raid5d(struct md_thread *thread) |
1da177e4 | 6281 | { |
4ed8731d | 6282 | struct mddev *mddev = thread->mddev; |
d1688a6d | 6283 | struct r5conf *conf = mddev->private; |
1da177e4 | 6284 | int handled; |
e1dfa0a2 | 6285 | struct blk_plug plug; |
1da177e4 | 6286 | |
45b4233c | 6287 | pr_debug("+++ raid5d active\n"); |
1da177e4 LT |
6288 | |
6289 | md_check_recovery(mddev); | |
1da177e4 | 6290 | |
e1dfa0a2 | 6291 | blk_start_plug(&plug); |
1da177e4 LT |
6292 | handled = 0; |
6293 | spin_lock_irq(&conf->device_lock); | |
6294 | while (1) { | |
46031f9a | 6295 | struct bio *bio; |
773ca82f | 6296 | int batch_size, released; |
0472a42b | 6297 | unsigned int offset; |
773ca82f | 6298 | |
566c09c5 | 6299 | released = release_stripe_list(conf, conf->temp_inactive_list); |
edbe83ab N |
6300 | if (released) |
6301 | clear_bit(R5_DID_ALLOC, &conf->cache_state); | |
1da177e4 | 6302 | |
0021b7bc | 6303 | if ( |
7c13edc8 N |
6304 | !list_empty(&conf->bitmap_list)) { |
6305 | /* Now is a good time to flush some bitmap updates */ | |
6306 | conf->seq_flush++; | |
700e432d | 6307 | spin_unlock_irq(&conf->device_lock); |
e64e4018 | 6308 | md_bitmap_unplug(mddev->bitmap); |
700e432d | 6309 | spin_lock_irq(&conf->device_lock); |
7c13edc8 | 6310 | conf->seq_write = conf->seq_flush; |
566c09c5 | 6311 | activate_bit_delay(conf, conf->temp_inactive_list); |
72626685 | 6312 | } |
0021b7bc | 6313 | raid5_activate_delayed(conf); |
72626685 | 6314 | |
0472a42b | 6315 | while ((bio = remove_bio_from_retry(conf, &offset))) { |
46031f9a RBJ |
6316 | int ok; |
6317 | spin_unlock_irq(&conf->device_lock); | |
0472a42b | 6318 | ok = retry_aligned_read(conf, bio, offset); |
46031f9a RBJ |
6319 | spin_lock_irq(&conf->device_lock); |
6320 | if (!ok) | |
6321 | break; | |
6322 | handled++; | |
6323 | } | |
6324 | ||
566c09c5 SL |
6325 | batch_size = handle_active_stripes(conf, ANY_GROUP, NULL, |
6326 | conf->temp_inactive_list); | |
773ca82f | 6327 | if (!batch_size && !released) |
1da177e4 | 6328 | break; |
46a06401 | 6329 | handled += batch_size; |
1da177e4 | 6330 | |
2953079c | 6331 | if (mddev->sb_flags & ~(1 << MD_SB_CHANGE_PENDING)) { |
46a06401 | 6332 | spin_unlock_irq(&conf->device_lock); |
de393cde | 6333 | md_check_recovery(mddev); |
46a06401 SL |
6334 | spin_lock_irq(&conf->device_lock); |
6335 | } | |
1da177e4 | 6336 | } |
45b4233c | 6337 | pr_debug("%d stripes handled\n", handled); |
1da177e4 LT |
6338 | |
6339 | spin_unlock_irq(&conf->device_lock); | |
2d5b569b N |
6340 | if (test_and_clear_bit(R5_ALLOC_MORE, &conf->cache_state) && |
6341 | mutex_trylock(&conf->cache_size_mutex)) { | |
edbe83ab N |
6342 | grow_one_stripe(conf, __GFP_NOWARN); |
6343 | /* Set flag even if allocation failed. This helps | |
6344 | * slow down allocation requests when mem is short | |
6345 | */ | |
6346 | set_bit(R5_DID_ALLOC, &conf->cache_state); | |
2d5b569b | 6347 | mutex_unlock(&conf->cache_size_mutex); |
edbe83ab | 6348 | } |
1da177e4 | 6349 | |
765d704d SL |
6350 | flush_deferred_bios(conf); |
6351 | ||
0576b1c6 SL |
6352 | r5l_flush_stripe_to_raid(conf->log); |
6353 | ||
c9f21aaf | 6354 | async_tx_issue_pending_all(); |
e1dfa0a2 | 6355 | blk_finish_plug(&plug); |
1da177e4 | 6356 | |
45b4233c | 6357 | pr_debug("--- raid5d inactive\n"); |
1da177e4 LT |
6358 | } |
6359 | ||
3f294f4f | 6360 | static ssize_t |
fd01b88c | 6361 | raid5_show_stripe_cache_size(struct mddev *mddev, char *page) |
3f294f4f | 6362 | { |
7b1485ba N |
6363 | struct r5conf *conf; |
6364 | int ret = 0; | |
6365 | spin_lock(&mddev->lock); | |
6366 | conf = mddev->private; | |
96de1e66 | 6367 | if (conf) |
edbe83ab | 6368 | ret = sprintf(page, "%d\n", conf->min_nr_stripes); |
7b1485ba N |
6369 | spin_unlock(&mddev->lock); |
6370 | return ret; | |
3f294f4f N |
6371 | } |
6372 | ||
c41d4ac4 | 6373 | int |
fd01b88c | 6374 | raid5_set_cache_size(struct mddev *mddev, int size) |
3f294f4f | 6375 | { |
483cbbed | 6376 | int result = 0; |
d1688a6d | 6377 | struct r5conf *conf = mddev->private; |
b5470dc5 | 6378 | |
c41d4ac4 | 6379 | if (size <= 16 || size > 32768) |
3f294f4f | 6380 | return -EINVAL; |
486f0644 | 6381 | |
edbe83ab | 6382 | conf->min_nr_stripes = size; |
2d5b569b | 6383 | mutex_lock(&conf->cache_size_mutex); |
486f0644 N |
6384 | while (size < conf->max_nr_stripes && |
6385 | drop_one_stripe(conf)) | |
6386 | ; | |
2d5b569b | 6387 | mutex_unlock(&conf->cache_size_mutex); |
486f0644 | 6388 | |
2214c260 | 6389 | md_allow_write(mddev); |
486f0644 | 6390 | |
2d5b569b | 6391 | mutex_lock(&conf->cache_size_mutex); |
486f0644 | 6392 | while (size > conf->max_nr_stripes) |
483cbbed AN |
6393 | if (!grow_one_stripe(conf, GFP_KERNEL)) { |
6394 | conf->min_nr_stripes = conf->max_nr_stripes; | |
6395 | result = -ENOMEM; | |
486f0644 | 6396 | break; |
483cbbed | 6397 | } |
2d5b569b | 6398 | mutex_unlock(&conf->cache_size_mutex); |
486f0644 | 6399 | |
483cbbed | 6400 | return result; |
c41d4ac4 N |
6401 | } |
6402 | EXPORT_SYMBOL(raid5_set_cache_size); | |
6403 | ||
6404 | static ssize_t | |
fd01b88c | 6405 | raid5_store_stripe_cache_size(struct mddev *mddev, const char *page, size_t len) |
c41d4ac4 | 6406 | { |
6791875e | 6407 | struct r5conf *conf; |
c41d4ac4 N |
6408 | unsigned long new; |
6409 | int err; | |
6410 | ||
6411 | if (len >= PAGE_SIZE) | |
6412 | return -EINVAL; | |
b29bebd6 | 6413 | if (kstrtoul(page, 10, &new)) |
c41d4ac4 | 6414 | return -EINVAL; |
6791875e | 6415 | err = mddev_lock(mddev); |
c41d4ac4 N |
6416 | if (err) |
6417 | return err; | |
6791875e N |
6418 | conf = mddev->private; |
6419 | if (!conf) | |
6420 | err = -ENODEV; | |
6421 | else | |
6422 | err = raid5_set_cache_size(mddev, new); | |
6423 | mddev_unlock(mddev); | |
6424 | ||
6425 | return err ?: len; | |
3f294f4f | 6426 | } |
007583c9 | 6427 | |
96de1e66 N |
6428 | static struct md_sysfs_entry |
6429 | raid5_stripecache_size = __ATTR(stripe_cache_size, S_IRUGO | S_IWUSR, | |
6430 | raid5_show_stripe_cache_size, | |
6431 | raid5_store_stripe_cache_size); | |
3f294f4f | 6432 | |
d06f191f MS |
6433 | static ssize_t |
6434 | raid5_show_rmw_level(struct mddev *mddev, char *page) | |
6435 | { | |
6436 | struct r5conf *conf = mddev->private; | |
6437 | if (conf) | |
6438 | return sprintf(page, "%d\n", conf->rmw_level); | |
6439 | else | |
6440 | return 0; | |
6441 | } | |
6442 | ||
6443 | static ssize_t | |
6444 | raid5_store_rmw_level(struct mddev *mddev, const char *page, size_t len) | |
6445 | { | |
6446 | struct r5conf *conf = mddev->private; | |
6447 | unsigned long new; | |
6448 | ||
6449 | if (!conf) | |
6450 | return -ENODEV; | |
6451 | ||
6452 | if (len >= PAGE_SIZE) | |
6453 | return -EINVAL; | |
6454 | ||
6455 | if (kstrtoul(page, 10, &new)) | |
6456 | return -EINVAL; | |
6457 | ||
6458 | if (new != PARITY_DISABLE_RMW && !raid6_call.xor_syndrome) | |
6459 | return -EINVAL; | |
6460 | ||
6461 | if (new != PARITY_DISABLE_RMW && | |
6462 | new != PARITY_ENABLE_RMW && | |
6463 | new != PARITY_PREFER_RMW) | |
6464 | return -EINVAL; | |
6465 | ||
6466 | conf->rmw_level = new; | |
6467 | return len; | |
6468 | } | |
6469 | ||
6470 | static struct md_sysfs_entry | |
6471 | raid5_rmw_level = __ATTR(rmw_level, S_IRUGO | S_IWUSR, | |
6472 | raid5_show_rmw_level, | |
6473 | raid5_store_rmw_level); | |
6474 | ||
6475 | ||
8b3e6cdc | 6476 | static ssize_t |
fd01b88c | 6477 | raid5_show_preread_threshold(struct mddev *mddev, char *page) |
8b3e6cdc | 6478 | { |
7b1485ba N |
6479 | struct r5conf *conf; |
6480 | int ret = 0; | |
6481 | spin_lock(&mddev->lock); | |
6482 | conf = mddev->private; | |
8b3e6cdc | 6483 | if (conf) |
7b1485ba N |
6484 | ret = sprintf(page, "%d\n", conf->bypass_threshold); |
6485 | spin_unlock(&mddev->lock); | |
6486 | return ret; | |
8b3e6cdc DW |
6487 | } |
6488 | ||
6489 | static ssize_t | |
fd01b88c | 6490 | raid5_store_preread_threshold(struct mddev *mddev, const char *page, size_t len) |
8b3e6cdc | 6491 | { |
6791875e | 6492 | struct r5conf *conf; |
4ef197d8 | 6493 | unsigned long new; |
6791875e N |
6494 | int err; |
6495 | ||
8b3e6cdc DW |
6496 | if (len >= PAGE_SIZE) |
6497 | return -EINVAL; | |
b29bebd6 | 6498 | if (kstrtoul(page, 10, &new)) |
8b3e6cdc | 6499 | return -EINVAL; |
6791875e N |
6500 | |
6501 | err = mddev_lock(mddev); | |
6502 | if (err) | |
6503 | return err; | |
6504 | conf = mddev->private; | |
6505 | if (!conf) | |
6506 | err = -ENODEV; | |
edbe83ab | 6507 | else if (new > conf->min_nr_stripes) |
6791875e N |
6508 | err = -EINVAL; |
6509 | else | |
6510 | conf->bypass_threshold = new; | |
6511 | mddev_unlock(mddev); | |
6512 | return err ?: len; | |
8b3e6cdc DW |
6513 | } |
6514 | ||
6515 | static struct md_sysfs_entry | |
6516 | raid5_preread_bypass_threshold = __ATTR(preread_bypass_threshold, | |
6517 | S_IRUGO | S_IWUSR, | |
6518 | raid5_show_preread_threshold, | |
6519 | raid5_store_preread_threshold); | |
6520 | ||
d592a996 SL |
6521 | static ssize_t |
6522 | raid5_show_skip_copy(struct mddev *mddev, char *page) | |
6523 | { | |
7b1485ba N |
6524 | struct r5conf *conf; |
6525 | int ret = 0; | |
6526 | spin_lock(&mddev->lock); | |
6527 | conf = mddev->private; | |
d592a996 | 6528 | if (conf) |
7b1485ba N |
6529 | ret = sprintf(page, "%d\n", conf->skip_copy); |
6530 | spin_unlock(&mddev->lock); | |
6531 | return ret; | |
d592a996 SL |
6532 | } |
6533 | ||
6534 | static ssize_t | |
6535 | raid5_store_skip_copy(struct mddev *mddev, const char *page, size_t len) | |
6536 | { | |
6791875e | 6537 | struct r5conf *conf; |
d592a996 | 6538 | unsigned long new; |
6791875e N |
6539 | int err; |
6540 | ||
d592a996 SL |
6541 | if (len >= PAGE_SIZE) |
6542 | return -EINVAL; | |
d592a996 SL |
6543 | if (kstrtoul(page, 10, &new)) |
6544 | return -EINVAL; | |
6545 | new = !!new; | |
6791875e N |
6546 | |
6547 | err = mddev_lock(mddev); | |
6548 | if (err) | |
6549 | return err; | |
6550 | conf = mddev->private; | |
6551 | if (!conf) | |
6552 | err = -ENODEV; | |
6553 | else if (new != conf->skip_copy) { | |
6554 | mddev_suspend(mddev); | |
6555 | conf->skip_copy = new; | |
6556 | if (new) | |
dc3b17cc | 6557 | mddev->queue->backing_dev_info->capabilities |= |
6791875e N |
6558 | BDI_CAP_STABLE_WRITES; |
6559 | else | |
dc3b17cc | 6560 | mddev->queue->backing_dev_info->capabilities &= |
6791875e N |
6561 | ~BDI_CAP_STABLE_WRITES; |
6562 | mddev_resume(mddev); | |
6563 | } | |
6564 | mddev_unlock(mddev); | |
6565 | return err ?: len; | |
d592a996 SL |
6566 | } |
6567 | ||
6568 | static struct md_sysfs_entry | |
6569 | raid5_skip_copy = __ATTR(skip_copy, S_IRUGO | S_IWUSR, | |
6570 | raid5_show_skip_copy, | |
6571 | raid5_store_skip_copy); | |
6572 | ||
3f294f4f | 6573 | static ssize_t |
fd01b88c | 6574 | stripe_cache_active_show(struct mddev *mddev, char *page) |
3f294f4f | 6575 | { |
d1688a6d | 6576 | struct r5conf *conf = mddev->private; |
96de1e66 N |
6577 | if (conf) |
6578 | return sprintf(page, "%d\n", atomic_read(&conf->active_stripes)); | |
6579 | else | |
6580 | return 0; | |
3f294f4f N |
6581 | } |
6582 | ||
96de1e66 N |
6583 | static struct md_sysfs_entry |
6584 | raid5_stripecache_active = __ATTR_RO(stripe_cache_active); | |
3f294f4f | 6585 | |
b721420e SL |
6586 | static ssize_t |
6587 | raid5_show_group_thread_cnt(struct mddev *mddev, char *page) | |
6588 | { | |
7b1485ba N |
6589 | struct r5conf *conf; |
6590 | int ret = 0; | |
6591 | spin_lock(&mddev->lock); | |
6592 | conf = mddev->private; | |
b721420e | 6593 | if (conf) |
7b1485ba N |
6594 | ret = sprintf(page, "%d\n", conf->worker_cnt_per_group); |
6595 | spin_unlock(&mddev->lock); | |
6596 | return ret; | |
b721420e SL |
6597 | } |
6598 | ||
60aaf933 | 6599 | static int alloc_thread_groups(struct r5conf *conf, int cnt, |
6600 | int *group_cnt, | |
6601 | int *worker_cnt_per_group, | |
6602 | struct r5worker_group **worker_groups); | |
b721420e SL |
6603 | static ssize_t |
6604 | raid5_store_group_thread_cnt(struct mddev *mddev, const char *page, size_t len) | |
6605 | { | |
6791875e | 6606 | struct r5conf *conf; |
7d5d7b50 | 6607 | unsigned int new; |
b721420e | 6608 | int err; |
60aaf933 | 6609 | struct r5worker_group *new_groups, *old_groups; |
6610 | int group_cnt, worker_cnt_per_group; | |
b721420e SL |
6611 | |
6612 | if (len >= PAGE_SIZE) | |
6613 | return -EINVAL; | |
7d5d7b50 SL |
6614 | if (kstrtouint(page, 10, &new)) |
6615 | return -EINVAL; | |
6616 | /* 8192 should be big enough */ | |
6617 | if (new > 8192) | |
b721420e SL |
6618 | return -EINVAL; |
6619 | ||
6791875e N |
6620 | err = mddev_lock(mddev); |
6621 | if (err) | |
6622 | return err; | |
6623 | conf = mddev->private; | |
6624 | if (!conf) | |
6625 | err = -ENODEV; | |
6626 | else if (new != conf->worker_cnt_per_group) { | |
6627 | mddev_suspend(mddev); | |
b721420e | 6628 | |
6791875e N |
6629 | old_groups = conf->worker_groups; |
6630 | if (old_groups) | |
6631 | flush_workqueue(raid5_wq); | |
d206dcfa | 6632 | |
6791875e N |
6633 | err = alloc_thread_groups(conf, new, |
6634 | &group_cnt, &worker_cnt_per_group, | |
6635 | &new_groups); | |
6636 | if (!err) { | |
6637 | spin_lock_irq(&conf->device_lock); | |
6638 | conf->group_cnt = group_cnt; | |
6639 | conf->worker_cnt_per_group = worker_cnt_per_group; | |
6640 | conf->worker_groups = new_groups; | |
6641 | spin_unlock_irq(&conf->device_lock); | |
b721420e | 6642 | |
6791875e N |
6643 | if (old_groups) |
6644 | kfree(old_groups[0].workers); | |
6645 | kfree(old_groups); | |
6646 | } | |
6647 | mddev_resume(mddev); | |
b721420e | 6648 | } |
6791875e | 6649 | mddev_unlock(mddev); |
b721420e | 6650 | |
6791875e | 6651 | return err ?: len; |
b721420e SL |
6652 | } |
6653 | ||
6654 | static struct md_sysfs_entry | |
6655 | raid5_group_thread_cnt = __ATTR(group_thread_cnt, S_IRUGO | S_IWUSR, | |
6656 | raid5_show_group_thread_cnt, | |
6657 | raid5_store_group_thread_cnt); | |
6658 | ||
007583c9 | 6659 | static struct attribute *raid5_attrs[] = { |
3f294f4f N |
6660 | &raid5_stripecache_size.attr, |
6661 | &raid5_stripecache_active.attr, | |
8b3e6cdc | 6662 | &raid5_preread_bypass_threshold.attr, |
b721420e | 6663 | &raid5_group_thread_cnt.attr, |
d592a996 | 6664 | &raid5_skip_copy.attr, |
d06f191f | 6665 | &raid5_rmw_level.attr, |
2c7da14b | 6666 | &r5c_journal_mode.attr, |
a596d086 | 6667 | &ppl_write_hint.attr, |
3f294f4f N |
6668 | NULL, |
6669 | }; | |
007583c9 N |
6670 | static struct attribute_group raid5_attrs_group = { |
6671 | .name = NULL, | |
6672 | .attrs = raid5_attrs, | |
3f294f4f N |
6673 | }; |
6674 | ||
60aaf933 | 6675 | static int alloc_thread_groups(struct r5conf *conf, int cnt, |
6676 | int *group_cnt, | |
6677 | int *worker_cnt_per_group, | |
6678 | struct r5worker_group **worker_groups) | |
851c30c9 | 6679 | { |
566c09c5 | 6680 | int i, j, k; |
851c30c9 SL |
6681 | ssize_t size; |
6682 | struct r5worker *workers; | |
6683 | ||
60aaf933 | 6684 | *worker_cnt_per_group = cnt; |
851c30c9 | 6685 | if (cnt == 0) { |
60aaf933 | 6686 | *group_cnt = 0; |
6687 | *worker_groups = NULL; | |
851c30c9 SL |
6688 | return 0; |
6689 | } | |
60aaf933 | 6690 | *group_cnt = num_possible_nodes(); |
851c30c9 | 6691 | size = sizeof(struct r5worker) * cnt; |
6396bb22 KC |
6692 | workers = kcalloc(size, *group_cnt, GFP_NOIO); |
6693 | *worker_groups = kcalloc(*group_cnt, sizeof(struct r5worker_group), | |
6694 | GFP_NOIO); | |
60aaf933 | 6695 | if (!*worker_groups || !workers) { |
851c30c9 | 6696 | kfree(workers); |
60aaf933 | 6697 | kfree(*worker_groups); |
851c30c9 SL |
6698 | return -ENOMEM; |
6699 | } | |
6700 | ||
60aaf933 | 6701 | for (i = 0; i < *group_cnt; i++) { |
851c30c9 SL |
6702 | struct r5worker_group *group; |
6703 | ||
0c775d52 | 6704 | group = &(*worker_groups)[i]; |
851c30c9 | 6705 | INIT_LIST_HEAD(&group->handle_list); |
535ae4eb | 6706 | INIT_LIST_HEAD(&group->loprio_list); |
851c30c9 SL |
6707 | group->conf = conf; |
6708 | group->workers = workers + i * cnt; | |
6709 | ||
6710 | for (j = 0; j < cnt; j++) { | |
566c09c5 SL |
6711 | struct r5worker *worker = group->workers + j; |
6712 | worker->group = group; | |
6713 | INIT_WORK(&worker->work, raid5_do_work); | |
6714 | ||
6715 | for (k = 0; k < NR_STRIPE_HASH_LOCKS; k++) | |
6716 | INIT_LIST_HEAD(worker->temp_inactive_list + k); | |
851c30c9 SL |
6717 | } |
6718 | } | |
6719 | ||
6720 | return 0; | |
6721 | } | |
6722 | ||
6723 | static void free_thread_groups(struct r5conf *conf) | |
6724 | { | |
6725 | if (conf->worker_groups) | |
6726 | kfree(conf->worker_groups[0].workers); | |
6727 | kfree(conf->worker_groups); | |
6728 | conf->worker_groups = NULL; | |
6729 | } | |
6730 | ||
80c3a6ce | 6731 | static sector_t |
fd01b88c | 6732 | raid5_size(struct mddev *mddev, sector_t sectors, int raid_disks) |
80c3a6ce | 6733 | { |
d1688a6d | 6734 | struct r5conf *conf = mddev->private; |
80c3a6ce DW |
6735 | |
6736 | if (!sectors) | |
6737 | sectors = mddev->dev_sectors; | |
5e5e3e78 | 6738 | if (!raid_disks) |
7ec05478 | 6739 | /* size is defined by the smallest of previous and new size */ |
5e5e3e78 | 6740 | raid_disks = min(conf->raid_disks, conf->previous_raid_disks); |
80c3a6ce | 6741 | |
3cb5edf4 N |
6742 | sectors &= ~((sector_t)conf->chunk_sectors - 1); |
6743 | sectors &= ~((sector_t)conf->prev_chunk_sectors - 1); | |
80c3a6ce DW |
6744 | return sectors * (raid_disks - conf->max_degraded); |
6745 | } | |
6746 | ||
789b5e03 ON |
6747 | static void free_scratch_buffer(struct r5conf *conf, struct raid5_percpu *percpu) |
6748 | { | |
6749 | safe_put_page(percpu->spare_page); | |
789b5e03 | 6750 | percpu->spare_page = NULL; |
b330e6a4 | 6751 | kvfree(percpu->scribble); |
789b5e03 ON |
6752 | percpu->scribble = NULL; |
6753 | } | |
6754 | ||
6755 | static int alloc_scratch_buffer(struct r5conf *conf, struct raid5_percpu *percpu) | |
6756 | { | |
b330e6a4 | 6757 | if (conf->level == 6 && !percpu->spare_page) { |
789b5e03 | 6758 | percpu->spare_page = alloc_page(GFP_KERNEL); |
b330e6a4 KO |
6759 | if (!percpu->spare_page) |
6760 | return -ENOMEM; | |
6761 | } | |
6762 | ||
6763 | if (scribble_alloc(percpu, | |
6764 | max(conf->raid_disks, | |
6765 | conf->previous_raid_disks), | |
6766 | max(conf->chunk_sectors, | |
6767 | conf->prev_chunk_sectors) | |
6768 | / STRIPE_SECTORS, | |
6769 | GFP_KERNEL)) { | |
789b5e03 ON |
6770 | free_scratch_buffer(conf, percpu); |
6771 | return -ENOMEM; | |
6772 | } | |
6773 | ||
6774 | return 0; | |
6775 | } | |
6776 | ||
29c6d1bb | 6777 | static int raid456_cpu_dead(unsigned int cpu, struct hlist_node *node) |
36d1c647 | 6778 | { |
29c6d1bb SAS |
6779 | struct r5conf *conf = hlist_entry_safe(node, struct r5conf, node); |
6780 | ||
6781 | free_scratch_buffer(conf, per_cpu_ptr(conf->percpu, cpu)); | |
6782 | return 0; | |
6783 | } | |
36d1c647 | 6784 | |
29c6d1bb SAS |
6785 | static void raid5_free_percpu(struct r5conf *conf) |
6786 | { | |
36d1c647 DW |
6787 | if (!conf->percpu) |
6788 | return; | |
6789 | ||
29c6d1bb | 6790 | cpuhp_state_remove_instance(CPUHP_MD_RAID5_PREPARE, &conf->node); |
36d1c647 DW |
6791 | free_percpu(conf->percpu); |
6792 | } | |
6793 | ||
d1688a6d | 6794 | static void free_conf(struct r5conf *conf) |
95fc17aa | 6795 | { |
d7bd398e SL |
6796 | int i; |
6797 | ||
ff875738 AP |
6798 | log_exit(conf); |
6799 | ||
565e0450 | 6800 | unregister_shrinker(&conf->shrinker); |
851c30c9 | 6801 | free_thread_groups(conf); |
95fc17aa | 6802 | shrink_stripes(conf); |
36d1c647 | 6803 | raid5_free_percpu(conf); |
d7bd398e SL |
6804 | for (i = 0; i < conf->pool_size; i++) |
6805 | if (conf->disks[i].extra_page) | |
6806 | put_page(conf->disks[i].extra_page); | |
95fc17aa | 6807 | kfree(conf->disks); |
afeee514 | 6808 | bioset_exit(&conf->bio_split); |
95fc17aa | 6809 | kfree(conf->stripe_hashtbl); |
aaf9f12e | 6810 | kfree(conf->pending_data); |
95fc17aa DW |
6811 | kfree(conf); |
6812 | } | |
6813 | ||
29c6d1bb | 6814 | static int raid456_cpu_up_prepare(unsigned int cpu, struct hlist_node *node) |
36d1c647 | 6815 | { |
29c6d1bb | 6816 | struct r5conf *conf = hlist_entry_safe(node, struct r5conf, node); |
36d1c647 DW |
6817 | struct raid5_percpu *percpu = per_cpu_ptr(conf->percpu, cpu); |
6818 | ||
29c6d1bb | 6819 | if (alloc_scratch_buffer(conf, percpu)) { |
cc6167b4 N |
6820 | pr_warn("%s: failed memory allocation for cpu%u\n", |
6821 | __func__, cpu); | |
29c6d1bb | 6822 | return -ENOMEM; |
36d1c647 | 6823 | } |
29c6d1bb | 6824 | return 0; |
36d1c647 | 6825 | } |
36d1c647 | 6826 | |
d1688a6d | 6827 | static int raid5_alloc_percpu(struct r5conf *conf) |
36d1c647 | 6828 | { |
789b5e03 | 6829 | int err = 0; |
36d1c647 | 6830 | |
789b5e03 ON |
6831 | conf->percpu = alloc_percpu(struct raid5_percpu); |
6832 | if (!conf->percpu) | |
36d1c647 | 6833 | return -ENOMEM; |
789b5e03 | 6834 | |
29c6d1bb | 6835 | err = cpuhp_state_add_instance(CPUHP_MD_RAID5_PREPARE, &conf->node); |
27a353c0 SL |
6836 | if (!err) { |
6837 | conf->scribble_disks = max(conf->raid_disks, | |
6838 | conf->previous_raid_disks); | |
6839 | conf->scribble_sectors = max(conf->chunk_sectors, | |
6840 | conf->prev_chunk_sectors); | |
6841 | } | |
36d1c647 DW |
6842 | return err; |
6843 | } | |
6844 | ||
edbe83ab N |
6845 | static unsigned long raid5_cache_scan(struct shrinker *shrink, |
6846 | struct shrink_control *sc) | |
6847 | { | |
6848 | struct r5conf *conf = container_of(shrink, struct r5conf, shrinker); | |
2d5b569b N |
6849 | unsigned long ret = SHRINK_STOP; |
6850 | ||
6851 | if (mutex_trylock(&conf->cache_size_mutex)) { | |
6852 | ret= 0; | |
49895bcc N |
6853 | while (ret < sc->nr_to_scan && |
6854 | conf->max_nr_stripes > conf->min_nr_stripes) { | |
2d5b569b N |
6855 | if (drop_one_stripe(conf) == 0) { |
6856 | ret = SHRINK_STOP; | |
6857 | break; | |
6858 | } | |
6859 | ret++; | |
6860 | } | |
6861 | mutex_unlock(&conf->cache_size_mutex); | |
edbe83ab N |
6862 | } |
6863 | return ret; | |
6864 | } | |
6865 | ||
6866 | static unsigned long raid5_cache_count(struct shrinker *shrink, | |
6867 | struct shrink_control *sc) | |
6868 | { | |
6869 | struct r5conf *conf = container_of(shrink, struct r5conf, shrinker); | |
6870 | ||
6871 | if (conf->max_nr_stripes < conf->min_nr_stripes) | |
6872 | /* unlikely, but not impossible */ | |
6873 | return 0; | |
6874 | return conf->max_nr_stripes - conf->min_nr_stripes; | |
6875 | } | |
6876 | ||
d1688a6d | 6877 | static struct r5conf *setup_conf(struct mddev *mddev) |
1da177e4 | 6878 | { |
d1688a6d | 6879 | struct r5conf *conf; |
5e5e3e78 | 6880 | int raid_disk, memory, max_disks; |
3cb03002 | 6881 | struct md_rdev *rdev; |
1da177e4 | 6882 | struct disk_info *disk; |
0232605d | 6883 | char pers_name[6]; |
566c09c5 | 6884 | int i; |
60aaf933 | 6885 | int group_cnt, worker_cnt_per_group; |
6886 | struct r5worker_group *new_group; | |
afeee514 | 6887 | int ret; |
1da177e4 | 6888 | |
91adb564 N |
6889 | if (mddev->new_level != 5 |
6890 | && mddev->new_level != 4 | |
6891 | && mddev->new_level != 6) { | |
cc6167b4 N |
6892 | pr_warn("md/raid:%s: raid level not set to 4/5/6 (%d)\n", |
6893 | mdname(mddev), mddev->new_level); | |
91adb564 | 6894 | return ERR_PTR(-EIO); |
1da177e4 | 6895 | } |
91adb564 N |
6896 | if ((mddev->new_level == 5 |
6897 | && !algorithm_valid_raid5(mddev->new_layout)) || | |
6898 | (mddev->new_level == 6 | |
6899 | && !algorithm_valid_raid6(mddev->new_layout))) { | |
cc6167b4 N |
6900 | pr_warn("md/raid:%s: layout %d not supported\n", |
6901 | mdname(mddev), mddev->new_layout); | |
91adb564 | 6902 | return ERR_PTR(-EIO); |
99c0fb5f | 6903 | } |
91adb564 | 6904 | if (mddev->new_level == 6 && mddev->raid_disks < 4) { |
cc6167b4 N |
6905 | pr_warn("md/raid:%s: not enough configured devices (%d, minimum 4)\n", |
6906 | mdname(mddev), mddev->raid_disks); | |
91adb564 | 6907 | return ERR_PTR(-EINVAL); |
4bbf3771 N |
6908 | } |
6909 | ||
664e7c41 AN |
6910 | if (!mddev->new_chunk_sectors || |
6911 | (mddev->new_chunk_sectors << 9) % PAGE_SIZE || | |
6912 | !is_power_of_2(mddev->new_chunk_sectors)) { | |
cc6167b4 N |
6913 | pr_warn("md/raid:%s: invalid chunk size %d\n", |
6914 | mdname(mddev), mddev->new_chunk_sectors << 9); | |
91adb564 | 6915 | return ERR_PTR(-EINVAL); |
f6705578 N |
6916 | } |
6917 | ||
d1688a6d | 6918 | conf = kzalloc(sizeof(struct r5conf), GFP_KERNEL); |
91adb564 | 6919 | if (conf == NULL) |
1da177e4 | 6920 | goto abort; |
aaf9f12e SL |
6921 | INIT_LIST_HEAD(&conf->free_list); |
6922 | INIT_LIST_HEAD(&conf->pending_list); | |
6396bb22 KC |
6923 | conf->pending_data = kcalloc(PENDING_IO_MAX, |
6924 | sizeof(struct r5pending_data), | |
6925 | GFP_KERNEL); | |
aaf9f12e SL |
6926 | if (!conf->pending_data) |
6927 | goto abort; | |
6928 | for (i = 0; i < PENDING_IO_MAX; i++) | |
6929 | list_add(&conf->pending_data[i].sibling, &conf->free_list); | |
851c30c9 | 6930 | /* Don't enable multi-threading by default*/ |
60aaf933 | 6931 | if (!alloc_thread_groups(conf, 0, &group_cnt, &worker_cnt_per_group, |
6932 | &new_group)) { | |
6933 | conf->group_cnt = group_cnt; | |
6934 | conf->worker_cnt_per_group = worker_cnt_per_group; | |
6935 | conf->worker_groups = new_group; | |
6936 | } else | |
851c30c9 | 6937 | goto abort; |
f5efd45a | 6938 | spin_lock_init(&conf->device_lock); |
c46501b2 | 6939 | seqcount_init(&conf->gen_lock); |
2d5b569b | 6940 | mutex_init(&conf->cache_size_mutex); |
b1b46486 | 6941 | init_waitqueue_head(&conf->wait_for_quiescent); |
6ab2a4b8 | 6942 | init_waitqueue_head(&conf->wait_for_stripe); |
f5efd45a DW |
6943 | init_waitqueue_head(&conf->wait_for_overlap); |
6944 | INIT_LIST_HEAD(&conf->handle_list); | |
535ae4eb | 6945 | INIT_LIST_HEAD(&conf->loprio_list); |
f5efd45a DW |
6946 | INIT_LIST_HEAD(&conf->hold_list); |
6947 | INIT_LIST_HEAD(&conf->delayed_list); | |
6948 | INIT_LIST_HEAD(&conf->bitmap_list); | |
773ca82f | 6949 | init_llist_head(&conf->released_stripes); |
f5efd45a DW |
6950 | atomic_set(&conf->active_stripes, 0); |
6951 | atomic_set(&conf->preread_active_stripes, 0); | |
6952 | atomic_set(&conf->active_aligned_reads, 0); | |
765d704d SL |
6953 | spin_lock_init(&conf->pending_bios_lock); |
6954 | conf->batch_bio_dispatch = true; | |
6955 | rdev_for_each(rdev, mddev) { | |
6956 | if (test_bit(Journal, &rdev->flags)) | |
6957 | continue; | |
6958 | if (blk_queue_nonrot(bdev_get_queue(rdev->bdev))) { | |
6959 | conf->batch_bio_dispatch = false; | |
6960 | break; | |
6961 | } | |
6962 | } | |
6963 | ||
f5efd45a | 6964 | conf->bypass_threshold = BYPASS_THRESHOLD; |
d890fa2b | 6965 | conf->recovery_disabled = mddev->recovery_disabled - 1; |
91adb564 N |
6966 | |
6967 | conf->raid_disks = mddev->raid_disks; | |
6968 | if (mddev->reshape_position == MaxSector) | |
6969 | conf->previous_raid_disks = mddev->raid_disks; | |
6970 | else | |
f6705578 | 6971 | conf->previous_raid_disks = mddev->raid_disks - mddev->delta_disks; |
5e5e3e78 | 6972 | max_disks = max(conf->raid_disks, conf->previous_raid_disks); |
f6705578 | 6973 | |
6396bb22 | 6974 | conf->disks = kcalloc(max_disks, sizeof(struct disk_info), |
b55e6bfc | 6975 | GFP_KERNEL); |
d7bd398e | 6976 | |
b55e6bfc N |
6977 | if (!conf->disks) |
6978 | goto abort; | |
9ffae0cf | 6979 | |
d7bd398e SL |
6980 | for (i = 0; i < max_disks; i++) { |
6981 | conf->disks[i].extra_page = alloc_page(GFP_KERNEL); | |
6982 | if (!conf->disks[i].extra_page) | |
6983 | goto abort; | |
6984 | } | |
6985 | ||
afeee514 KO |
6986 | ret = bioset_init(&conf->bio_split, BIO_POOL_SIZE, 0, 0); |
6987 | if (ret) | |
dd7a8f5d | 6988 | goto abort; |
1da177e4 LT |
6989 | conf->mddev = mddev; |
6990 | ||
fccddba0 | 6991 | if ((conf->stripe_hashtbl = kzalloc(PAGE_SIZE, GFP_KERNEL)) == NULL) |
1da177e4 | 6992 | goto abort; |
1da177e4 | 6993 | |
566c09c5 SL |
6994 | /* We init hash_locks[0] separately to that it can be used |
6995 | * as the reference lock in the spin_lock_nest_lock() call | |
6996 | * in lock_all_device_hash_locks_irq in order to convince | |
6997 | * lockdep that we know what we are doing. | |
6998 | */ | |
6999 | spin_lock_init(conf->hash_locks); | |
7000 | for (i = 1; i < NR_STRIPE_HASH_LOCKS; i++) | |
7001 | spin_lock_init(conf->hash_locks + i); | |
7002 | ||
7003 | for (i = 0; i < NR_STRIPE_HASH_LOCKS; i++) | |
7004 | INIT_LIST_HEAD(conf->inactive_list + i); | |
7005 | ||
7006 | for (i = 0; i < NR_STRIPE_HASH_LOCKS; i++) | |
7007 | INIT_LIST_HEAD(conf->temp_inactive_list + i); | |
7008 | ||
1e6d690b SL |
7009 | atomic_set(&conf->r5c_cached_full_stripes, 0); |
7010 | INIT_LIST_HEAD(&conf->r5c_full_stripe_list); | |
7011 | atomic_set(&conf->r5c_cached_partial_stripes, 0); | |
7012 | INIT_LIST_HEAD(&conf->r5c_partial_stripe_list); | |
e33fbb9c SL |
7013 | atomic_set(&conf->r5c_flushing_full_stripes, 0); |
7014 | atomic_set(&conf->r5c_flushing_partial_stripes, 0); | |
1e6d690b | 7015 | |
36d1c647 | 7016 | conf->level = mddev->new_level; |
46d5b785 | 7017 | conf->chunk_sectors = mddev->new_chunk_sectors; |
36d1c647 DW |
7018 | if (raid5_alloc_percpu(conf) != 0) |
7019 | goto abort; | |
7020 | ||
0c55e022 | 7021 | pr_debug("raid456: run(%s) called.\n", mdname(mddev)); |
1da177e4 | 7022 | |
dafb20fa | 7023 | rdev_for_each(rdev, mddev) { |
1da177e4 | 7024 | raid_disk = rdev->raid_disk; |
5e5e3e78 | 7025 | if (raid_disk >= max_disks |
f2076e7d | 7026 | || raid_disk < 0 || test_bit(Journal, &rdev->flags)) |
1da177e4 LT |
7027 | continue; |
7028 | disk = conf->disks + raid_disk; | |
7029 | ||
17045f52 N |
7030 | if (test_bit(Replacement, &rdev->flags)) { |
7031 | if (disk->replacement) | |
7032 | goto abort; | |
7033 | disk->replacement = rdev; | |
7034 | } else { | |
7035 | if (disk->rdev) | |
7036 | goto abort; | |
7037 | disk->rdev = rdev; | |
7038 | } | |
1da177e4 | 7039 | |
b2d444d7 | 7040 | if (test_bit(In_sync, &rdev->flags)) { |
1da177e4 | 7041 | char b[BDEVNAME_SIZE]; |
cc6167b4 N |
7042 | pr_info("md/raid:%s: device %s operational as raid disk %d\n", |
7043 | mdname(mddev), bdevname(rdev->bdev, b), raid_disk); | |
d6b212f4 | 7044 | } else if (rdev->saved_raid_disk != raid_disk) |
8c2e870a NB |
7045 | /* Cannot rely on bitmap to complete recovery */ |
7046 | conf->fullsync = 1; | |
1da177e4 LT |
7047 | } |
7048 | ||
91adb564 | 7049 | conf->level = mddev->new_level; |
584acdd4 | 7050 | if (conf->level == 6) { |
16a53ecc | 7051 | conf->max_degraded = 2; |
584acdd4 MS |
7052 | if (raid6_call.xor_syndrome) |
7053 | conf->rmw_level = PARITY_ENABLE_RMW; | |
7054 | else | |
7055 | conf->rmw_level = PARITY_DISABLE_RMW; | |
7056 | } else { | |
16a53ecc | 7057 | conf->max_degraded = 1; |
584acdd4 MS |
7058 | conf->rmw_level = PARITY_ENABLE_RMW; |
7059 | } | |
91adb564 | 7060 | conf->algorithm = mddev->new_layout; |
fef9c61f | 7061 | conf->reshape_progress = mddev->reshape_position; |
e183eaed | 7062 | if (conf->reshape_progress != MaxSector) { |
09c9e5fa | 7063 | conf->prev_chunk_sectors = mddev->chunk_sectors; |
e183eaed | 7064 | conf->prev_algo = mddev->layout; |
5cac6bcb N |
7065 | } else { |
7066 | conf->prev_chunk_sectors = conf->chunk_sectors; | |
7067 | conf->prev_algo = conf->algorithm; | |
e183eaed | 7068 | } |
1da177e4 | 7069 | |
edbe83ab | 7070 | conf->min_nr_stripes = NR_STRIPES; |
ad5b0f76 SL |
7071 | if (mddev->reshape_position != MaxSector) { |
7072 | int stripes = max_t(int, | |
7073 | ((mddev->chunk_sectors << 9) / STRIPE_SIZE) * 4, | |
7074 | ((mddev->new_chunk_sectors << 9) / STRIPE_SIZE) * 4); | |
7075 | conf->min_nr_stripes = max(NR_STRIPES, stripes); | |
7076 | if (conf->min_nr_stripes != NR_STRIPES) | |
cc6167b4 | 7077 | pr_info("md/raid:%s: force stripe size %d for reshape\n", |
ad5b0f76 SL |
7078 | mdname(mddev), conf->min_nr_stripes); |
7079 | } | |
edbe83ab | 7080 | memory = conf->min_nr_stripes * (sizeof(struct stripe_head) + |
5e5e3e78 | 7081 | max_disks * ((sizeof(struct bio) + PAGE_SIZE))) / 1024; |
4bda556a | 7082 | atomic_set(&conf->empty_inactive_list_nr, NR_STRIPE_HASH_LOCKS); |
edbe83ab | 7083 | if (grow_stripes(conf, conf->min_nr_stripes)) { |
cc6167b4 N |
7084 | pr_warn("md/raid:%s: couldn't allocate %dkB for buffers\n", |
7085 | mdname(mddev), memory); | |
91adb564 N |
7086 | goto abort; |
7087 | } else | |
cc6167b4 | 7088 | pr_debug("md/raid:%s: allocated %dkB\n", mdname(mddev), memory); |
edbe83ab N |
7089 | /* |
7090 | * Losing a stripe head costs more than the time to refill it, | |
7091 | * it reduces the queue depth and so can hurt throughput. | |
7092 | * So set it rather large, scaled by number of devices. | |
7093 | */ | |
7094 | conf->shrinker.seeks = DEFAULT_SEEKS * conf->raid_disks * 4; | |
7095 | conf->shrinker.scan_objects = raid5_cache_scan; | |
7096 | conf->shrinker.count_objects = raid5_cache_count; | |
7097 | conf->shrinker.batch = 128; | |
7098 | conf->shrinker.flags = 0; | |
6a0f53ff | 7099 | if (register_shrinker(&conf->shrinker)) { |
cc6167b4 N |
7100 | pr_warn("md/raid:%s: couldn't register shrinker.\n", |
7101 | mdname(mddev)); | |
6a0f53ff CY |
7102 | goto abort; |
7103 | } | |
1da177e4 | 7104 | |
0232605d N |
7105 | sprintf(pers_name, "raid%d", mddev->new_level); |
7106 | conf->thread = md_register_thread(raid5d, mddev, pers_name); | |
91adb564 | 7107 | if (!conf->thread) { |
cc6167b4 N |
7108 | pr_warn("md/raid:%s: couldn't allocate thread.\n", |
7109 | mdname(mddev)); | |
16a53ecc N |
7110 | goto abort; |
7111 | } | |
91adb564 N |
7112 | |
7113 | return conf; | |
7114 | ||
7115 | abort: | |
7116 | if (conf) { | |
95fc17aa | 7117 | free_conf(conf); |
91adb564 N |
7118 | return ERR_PTR(-EIO); |
7119 | } else | |
7120 | return ERR_PTR(-ENOMEM); | |
7121 | } | |
7122 | ||
c148ffdc N |
7123 | static int only_parity(int raid_disk, int algo, int raid_disks, int max_degraded) |
7124 | { | |
7125 | switch (algo) { | |
7126 | case ALGORITHM_PARITY_0: | |
7127 | if (raid_disk < max_degraded) | |
7128 | return 1; | |
7129 | break; | |
7130 | case ALGORITHM_PARITY_N: | |
7131 | if (raid_disk >= raid_disks - max_degraded) | |
7132 | return 1; | |
7133 | break; | |
7134 | case ALGORITHM_PARITY_0_6: | |
f72ffdd6 | 7135 | if (raid_disk == 0 || |
c148ffdc N |
7136 | raid_disk == raid_disks - 1) |
7137 | return 1; | |
7138 | break; | |
7139 | case ALGORITHM_LEFT_ASYMMETRIC_6: | |
7140 | case ALGORITHM_RIGHT_ASYMMETRIC_6: | |
7141 | case ALGORITHM_LEFT_SYMMETRIC_6: | |
7142 | case ALGORITHM_RIGHT_SYMMETRIC_6: | |
7143 | if (raid_disk == raid_disks - 1) | |
7144 | return 1; | |
7145 | } | |
7146 | return 0; | |
7147 | } | |
7148 | ||
849674e4 | 7149 | static int raid5_run(struct mddev *mddev) |
91adb564 | 7150 | { |
d1688a6d | 7151 | struct r5conf *conf; |
9f7c2220 | 7152 | int working_disks = 0; |
c148ffdc | 7153 | int dirty_parity_disks = 0; |
3cb03002 | 7154 | struct md_rdev *rdev; |
713cf5a6 | 7155 | struct md_rdev *journal_dev = NULL; |
c148ffdc | 7156 | sector_t reshape_offset = 0; |
17045f52 | 7157 | int i; |
b5254dd5 N |
7158 | long long min_offset_diff = 0; |
7159 | int first = 1; | |
91adb564 | 7160 | |
a415c0f1 N |
7161 | if (mddev_init_writes_pending(mddev) < 0) |
7162 | return -ENOMEM; | |
7163 | ||
8c6ac868 | 7164 | if (mddev->recovery_cp != MaxSector) |
cc6167b4 N |
7165 | pr_notice("md/raid:%s: not clean -- starting background reconstruction\n", |
7166 | mdname(mddev)); | |
b5254dd5 N |
7167 | |
7168 | rdev_for_each(rdev, mddev) { | |
7169 | long long diff; | |
713cf5a6 | 7170 | |
f2076e7d | 7171 | if (test_bit(Journal, &rdev->flags)) { |
713cf5a6 | 7172 | journal_dev = rdev; |
f2076e7d SL |
7173 | continue; |
7174 | } | |
b5254dd5 N |
7175 | if (rdev->raid_disk < 0) |
7176 | continue; | |
7177 | diff = (rdev->new_data_offset - rdev->data_offset); | |
7178 | if (first) { | |
7179 | min_offset_diff = diff; | |
7180 | first = 0; | |
7181 | } else if (mddev->reshape_backwards && | |
7182 | diff < min_offset_diff) | |
7183 | min_offset_diff = diff; | |
7184 | else if (!mddev->reshape_backwards && | |
7185 | diff > min_offset_diff) | |
7186 | min_offset_diff = diff; | |
7187 | } | |
7188 | ||
230b55fa N |
7189 | if ((test_bit(MD_HAS_JOURNAL, &mddev->flags) || journal_dev) && |
7190 | (mddev->bitmap_info.offset || mddev->bitmap_info.file)) { | |
7191 | pr_notice("md/raid:%s: array cannot have both journal and bitmap\n", | |
7192 | mdname(mddev)); | |
7193 | return -EINVAL; | |
7194 | } | |
7195 | ||
91adb564 N |
7196 | if (mddev->reshape_position != MaxSector) { |
7197 | /* Check that we can continue the reshape. | |
b5254dd5 N |
7198 | * Difficulties arise if the stripe we would write to |
7199 | * next is at or after the stripe we would read from next. | |
7200 | * For a reshape that changes the number of devices, this | |
7201 | * is only possible for a very short time, and mdadm makes | |
7202 | * sure that time appears to have past before assembling | |
7203 | * the array. So we fail if that time hasn't passed. | |
7204 | * For a reshape that keeps the number of devices the same | |
7205 | * mdadm must be monitoring the reshape can keeping the | |
7206 | * critical areas read-only and backed up. It will start | |
7207 | * the array in read-only mode, so we check for that. | |
91adb564 N |
7208 | */ |
7209 | sector_t here_new, here_old; | |
7210 | int old_disks; | |
18b00334 | 7211 | int max_degraded = (mddev->level == 6 ? 2 : 1); |
05256d98 N |
7212 | int chunk_sectors; |
7213 | int new_data_disks; | |
91adb564 | 7214 | |
713cf5a6 | 7215 | if (journal_dev) { |
cc6167b4 N |
7216 | pr_warn("md/raid:%s: don't support reshape with journal - aborting.\n", |
7217 | mdname(mddev)); | |
713cf5a6 SL |
7218 | return -EINVAL; |
7219 | } | |
7220 | ||
88ce4930 | 7221 | if (mddev->new_level != mddev->level) { |
cc6167b4 N |
7222 | pr_warn("md/raid:%s: unsupported reshape required - aborting.\n", |
7223 | mdname(mddev)); | |
91adb564 N |
7224 | return -EINVAL; |
7225 | } | |
91adb564 N |
7226 | old_disks = mddev->raid_disks - mddev->delta_disks; |
7227 | /* reshape_position must be on a new-stripe boundary, and one | |
7228 | * further up in new geometry must map after here in old | |
7229 | * geometry. | |
05256d98 N |
7230 | * If the chunk sizes are different, then as we perform reshape |
7231 | * in units of the largest of the two, reshape_position needs | |
7232 | * be a multiple of the largest chunk size times new data disks. | |
91adb564 N |
7233 | */ |
7234 | here_new = mddev->reshape_position; | |
05256d98 N |
7235 | chunk_sectors = max(mddev->chunk_sectors, mddev->new_chunk_sectors); |
7236 | new_data_disks = mddev->raid_disks - max_degraded; | |
7237 | if (sector_div(here_new, chunk_sectors * new_data_disks)) { | |
cc6167b4 N |
7238 | pr_warn("md/raid:%s: reshape_position not on a stripe boundary\n", |
7239 | mdname(mddev)); | |
91adb564 N |
7240 | return -EINVAL; |
7241 | } | |
05256d98 | 7242 | reshape_offset = here_new * chunk_sectors; |
91adb564 N |
7243 | /* here_new is the stripe we will write to */ |
7244 | here_old = mddev->reshape_position; | |
05256d98 | 7245 | sector_div(here_old, chunk_sectors * (old_disks-max_degraded)); |
91adb564 N |
7246 | /* here_old is the first stripe that we might need to read |
7247 | * from */ | |
67ac6011 N |
7248 | if (mddev->delta_disks == 0) { |
7249 | /* We cannot be sure it is safe to start an in-place | |
b5254dd5 | 7250 | * reshape. It is only safe if user-space is monitoring |
67ac6011 N |
7251 | * and taking constant backups. |
7252 | * mdadm always starts a situation like this in | |
7253 | * readonly mode so it can take control before | |
7254 | * allowing any writes. So just check for that. | |
7255 | */ | |
b5254dd5 N |
7256 | if (abs(min_offset_diff) >= mddev->chunk_sectors && |
7257 | abs(min_offset_diff) >= mddev->new_chunk_sectors) | |
7258 | /* not really in-place - so OK */; | |
7259 | else if (mddev->ro == 0) { | |
cc6167b4 N |
7260 | pr_warn("md/raid:%s: in-place reshape must be started in read-only mode - aborting\n", |
7261 | mdname(mddev)); | |
67ac6011 N |
7262 | return -EINVAL; |
7263 | } | |
2c810cdd | 7264 | } else if (mddev->reshape_backwards |
05256d98 N |
7265 | ? (here_new * chunk_sectors + min_offset_diff <= |
7266 | here_old * chunk_sectors) | |
7267 | : (here_new * chunk_sectors >= | |
7268 | here_old * chunk_sectors + (-min_offset_diff))) { | |
91adb564 | 7269 | /* Reading from the same stripe as writing to - bad */ |
cc6167b4 N |
7270 | pr_warn("md/raid:%s: reshape_position too early for auto-recovery - aborting.\n", |
7271 | mdname(mddev)); | |
91adb564 N |
7272 | return -EINVAL; |
7273 | } | |
cc6167b4 | 7274 | pr_debug("md/raid:%s: reshape will continue\n", mdname(mddev)); |
91adb564 N |
7275 | /* OK, we should be able to continue; */ |
7276 | } else { | |
7277 | BUG_ON(mddev->level != mddev->new_level); | |
7278 | BUG_ON(mddev->layout != mddev->new_layout); | |
664e7c41 | 7279 | BUG_ON(mddev->chunk_sectors != mddev->new_chunk_sectors); |
91adb564 | 7280 | BUG_ON(mddev->delta_disks != 0); |
1da177e4 | 7281 | } |
91adb564 | 7282 | |
3418d036 AP |
7283 | if (test_bit(MD_HAS_JOURNAL, &mddev->flags) && |
7284 | test_bit(MD_HAS_PPL, &mddev->flags)) { | |
7285 | pr_warn("md/raid:%s: using journal device and PPL not allowed - disabling PPL\n", | |
7286 | mdname(mddev)); | |
7287 | clear_bit(MD_HAS_PPL, &mddev->flags); | |
ddc08823 | 7288 | clear_bit(MD_HAS_MULTIPLE_PPLS, &mddev->flags); |
3418d036 AP |
7289 | } |
7290 | ||
245f46c2 N |
7291 | if (mddev->private == NULL) |
7292 | conf = setup_conf(mddev); | |
7293 | else | |
7294 | conf = mddev->private; | |
7295 | ||
91adb564 N |
7296 | if (IS_ERR(conf)) |
7297 | return PTR_ERR(conf); | |
7298 | ||
486b0f7b SL |
7299 | if (test_bit(MD_HAS_JOURNAL, &mddev->flags)) { |
7300 | if (!journal_dev) { | |
cc6167b4 N |
7301 | pr_warn("md/raid:%s: journal disk is missing, force array readonly\n", |
7302 | mdname(mddev)); | |
486b0f7b SL |
7303 | mddev->ro = 1; |
7304 | set_disk_ro(mddev->gendisk, 1); | |
7305 | } else if (mddev->recovery_cp == MaxSector) | |
7306 | set_bit(MD_JOURNAL_CLEAN, &mddev->flags); | |
7dde2ad3 SL |
7307 | } |
7308 | ||
b5254dd5 | 7309 | conf->min_offset_diff = min_offset_diff; |
91adb564 N |
7310 | mddev->thread = conf->thread; |
7311 | conf->thread = NULL; | |
7312 | mddev->private = conf; | |
7313 | ||
17045f52 N |
7314 | for (i = 0; i < conf->raid_disks && conf->previous_raid_disks; |
7315 | i++) { | |
7316 | rdev = conf->disks[i].rdev; | |
7317 | if (!rdev && conf->disks[i].replacement) { | |
7318 | /* The replacement is all we have yet */ | |
7319 | rdev = conf->disks[i].replacement; | |
7320 | conf->disks[i].replacement = NULL; | |
7321 | clear_bit(Replacement, &rdev->flags); | |
7322 | conf->disks[i].rdev = rdev; | |
7323 | } | |
7324 | if (!rdev) | |
c148ffdc | 7325 | continue; |
17045f52 N |
7326 | if (conf->disks[i].replacement && |
7327 | conf->reshape_progress != MaxSector) { | |
7328 | /* replacements and reshape simply do not mix. */ | |
cc6167b4 | 7329 | pr_warn("md: cannot handle concurrent replacement and reshape.\n"); |
17045f52 N |
7330 | goto abort; |
7331 | } | |
2f115882 | 7332 | if (test_bit(In_sync, &rdev->flags)) { |
91adb564 | 7333 | working_disks++; |
2f115882 N |
7334 | continue; |
7335 | } | |
c148ffdc N |
7336 | /* This disc is not fully in-sync. However if it |
7337 | * just stored parity (beyond the recovery_offset), | |
7338 | * when we don't need to be concerned about the | |
7339 | * array being dirty. | |
7340 | * When reshape goes 'backwards', we never have | |
7341 | * partially completed devices, so we only need | |
7342 | * to worry about reshape going forwards. | |
7343 | */ | |
7344 | /* Hack because v0.91 doesn't store recovery_offset properly. */ | |
7345 | if (mddev->major_version == 0 && | |
7346 | mddev->minor_version > 90) | |
7347 | rdev->recovery_offset = reshape_offset; | |
5026d7a9 | 7348 | |
c148ffdc N |
7349 | if (rdev->recovery_offset < reshape_offset) { |
7350 | /* We need to check old and new layout */ | |
7351 | if (!only_parity(rdev->raid_disk, | |
7352 | conf->algorithm, | |
7353 | conf->raid_disks, | |
7354 | conf->max_degraded)) | |
7355 | continue; | |
7356 | } | |
7357 | if (!only_parity(rdev->raid_disk, | |
7358 | conf->prev_algo, | |
7359 | conf->previous_raid_disks, | |
7360 | conf->max_degraded)) | |
7361 | continue; | |
7362 | dirty_parity_disks++; | |
7363 | } | |
91adb564 | 7364 | |
17045f52 N |
7365 | /* |
7366 | * 0 for a fully functional array, 1 or 2 for a degraded array. | |
7367 | */ | |
2e38a37f | 7368 | mddev->degraded = raid5_calc_degraded(conf); |
91adb564 | 7369 | |
674806d6 | 7370 | if (has_failed(conf)) { |
cc6167b4 | 7371 | pr_crit("md/raid:%s: not enough operational devices (%d/%d failed)\n", |
02c2de8c | 7372 | mdname(mddev), mddev->degraded, conf->raid_disks); |
1da177e4 LT |
7373 | goto abort; |
7374 | } | |
7375 | ||
91adb564 | 7376 | /* device size must be a multiple of chunk size */ |
9d8f0363 | 7377 | mddev->dev_sectors &= ~(mddev->chunk_sectors - 1); |
91adb564 N |
7378 | mddev->resync_max_sectors = mddev->dev_sectors; |
7379 | ||
c148ffdc | 7380 | if (mddev->degraded > dirty_parity_disks && |
1da177e4 | 7381 | mddev->recovery_cp != MaxSector) { |
4536bf9b AP |
7382 | if (test_bit(MD_HAS_PPL, &mddev->flags)) |
7383 | pr_crit("md/raid:%s: starting dirty degraded array with PPL.\n", | |
7384 | mdname(mddev)); | |
7385 | else if (mddev->ok_start_degraded) | |
cc6167b4 N |
7386 | pr_crit("md/raid:%s: starting dirty degraded array - data corruption possible.\n", |
7387 | mdname(mddev)); | |
6ff8d8ec | 7388 | else { |
cc6167b4 N |
7389 | pr_crit("md/raid:%s: cannot start dirty degraded array.\n", |
7390 | mdname(mddev)); | |
6ff8d8ec N |
7391 | goto abort; |
7392 | } | |
1da177e4 LT |
7393 | } |
7394 | ||
cc6167b4 N |
7395 | pr_info("md/raid:%s: raid level %d active with %d out of %d devices, algorithm %d\n", |
7396 | mdname(mddev), conf->level, | |
7397 | mddev->raid_disks-mddev->degraded, mddev->raid_disks, | |
7398 | mddev->new_layout); | |
1da177e4 LT |
7399 | |
7400 | print_raid5_conf(conf); | |
7401 | ||
fef9c61f | 7402 | if (conf->reshape_progress != MaxSector) { |
fef9c61f | 7403 | conf->reshape_safe = conf->reshape_progress; |
f6705578 N |
7404 | atomic_set(&conf->reshape_stripes, 0); |
7405 | clear_bit(MD_RECOVERY_SYNC, &mddev->recovery); | |
7406 | clear_bit(MD_RECOVERY_CHECK, &mddev->recovery); | |
7407 | set_bit(MD_RECOVERY_RESHAPE, &mddev->recovery); | |
7408 | set_bit(MD_RECOVERY_RUNNING, &mddev->recovery); | |
7409 | mddev->sync_thread = md_register_thread(md_do_sync, mddev, | |
0da3c619 | 7410 | "reshape"); |
e406f12d AP |
7411 | if (!mddev->sync_thread) |
7412 | goto abort; | |
f6705578 N |
7413 | } |
7414 | ||
1da177e4 | 7415 | /* Ok, everything is just fine now */ |
a64c876f N |
7416 | if (mddev->to_remove == &raid5_attrs_group) |
7417 | mddev->to_remove = NULL; | |
00bcb4ac N |
7418 | else if (mddev->kobj.sd && |
7419 | sysfs_create_group(&mddev->kobj, &raid5_attrs_group)) | |
cc6167b4 N |
7420 | pr_warn("raid5: failed to create sysfs attributes for %s\n", |
7421 | mdname(mddev)); | |
4a5add49 | 7422 | md_set_array_sectors(mddev, raid5_size(mddev, 0, 0)); |
7a5febe9 | 7423 | |
4a5add49 | 7424 | if (mddev->queue) { |
9f7c2220 | 7425 | int chunk_size; |
4a5add49 N |
7426 | /* read-ahead size must cover two whole stripes, which |
7427 | * is 2 * (datadisks) * chunksize where 'n' is the | |
7428 | * number of raid devices | |
7429 | */ | |
7430 | int data_disks = conf->previous_raid_disks - conf->max_degraded; | |
7431 | int stripe = data_disks * | |
7432 | ((mddev->chunk_sectors << 9) / PAGE_SIZE); | |
dc3b17cc JK |
7433 | if (mddev->queue->backing_dev_info->ra_pages < 2 * stripe) |
7434 | mddev->queue->backing_dev_info->ra_pages = 2 * stripe; | |
91adb564 | 7435 | |
9f7c2220 N |
7436 | chunk_size = mddev->chunk_sectors << 9; |
7437 | blk_queue_io_min(mddev->queue, chunk_size); | |
7438 | blk_queue_io_opt(mddev->queue, chunk_size * | |
7439 | (conf->raid_disks - conf->max_degraded)); | |
c78afc62 | 7440 | mddev->queue->limits.raid_partial_stripes_expensive = 1; |
620125f2 SL |
7441 | /* |
7442 | * We can only discard a whole stripe. It doesn't make sense to | |
7443 | * discard data disk but write parity disk | |
7444 | */ | |
7445 | stripe = stripe * PAGE_SIZE; | |
4ac6875e N |
7446 | /* Round up to power of 2, as discard handling |
7447 | * currently assumes that */ | |
7448 | while ((stripe-1) & stripe) | |
7449 | stripe = (stripe | (stripe-1)) + 1; | |
620125f2 SL |
7450 | mddev->queue->limits.discard_alignment = stripe; |
7451 | mddev->queue->limits.discard_granularity = stripe; | |
e8d7c332 | 7452 | |
5026d7a9 | 7453 | blk_queue_max_write_same_sectors(mddev->queue, 0); |
3deff1a7 | 7454 | blk_queue_max_write_zeroes_sectors(mddev->queue, 0); |
5026d7a9 | 7455 | |
05616be5 | 7456 | rdev_for_each(rdev, mddev) { |
9f7c2220 N |
7457 | disk_stack_limits(mddev->gendisk, rdev->bdev, |
7458 | rdev->data_offset << 9); | |
05616be5 N |
7459 | disk_stack_limits(mddev->gendisk, rdev->bdev, |
7460 | rdev->new_data_offset << 9); | |
7461 | } | |
620125f2 | 7462 | |
48920ff2 CH |
7463 | /* |
7464 | * zeroing is required, otherwise data | |
7465 | * could be lost. Consider a scenario: discard a stripe | |
7466 | * (the stripe could be inconsistent if | |
7467 | * discard_zeroes_data is 0); write one disk of the | |
7468 | * stripe (the stripe could be inconsistent again | |
7469 | * depending on which disks are used to calculate | |
7470 | * parity); the disk is broken; The stripe data of this | |
7471 | * disk is lost. | |
7472 | * | |
7473 | * We only allow DISCARD if the sysadmin has confirmed that | |
7474 | * only safe devices are in use by setting a module parameter. | |
7475 | * A better idea might be to turn DISCARD into WRITE_ZEROES | |
7476 | * requests, as that is required to be safe. | |
7477 | */ | |
7478 | if (devices_handle_discard_safely && | |
e7597e69 JS |
7479 | mddev->queue->limits.max_discard_sectors >= (stripe >> 9) && |
7480 | mddev->queue->limits.discard_granularity >= stripe) | |
8b904b5b | 7481 | blk_queue_flag_set(QUEUE_FLAG_DISCARD, |
620125f2 SL |
7482 | mddev->queue); |
7483 | else | |
8b904b5b | 7484 | blk_queue_flag_clear(QUEUE_FLAG_DISCARD, |
620125f2 | 7485 | mddev->queue); |
1dffdddd SL |
7486 | |
7487 | blk_queue_max_hw_sectors(mddev->queue, UINT_MAX); | |
9f7c2220 | 7488 | } |
23032a0e | 7489 | |
845b9e22 | 7490 | if (log_init(conf, journal_dev, raid5_has_ppl(conf))) |
ff875738 | 7491 | goto abort; |
5c7e81c3 | 7492 | |
1da177e4 LT |
7493 | return 0; |
7494 | abort: | |
01f96c0a | 7495 | md_unregister_thread(&mddev->thread); |
e4f869d9 N |
7496 | print_raid5_conf(conf); |
7497 | free_conf(conf); | |
1da177e4 | 7498 | mddev->private = NULL; |
cc6167b4 | 7499 | pr_warn("md/raid:%s: failed to run raid set.\n", mdname(mddev)); |
1da177e4 LT |
7500 | return -EIO; |
7501 | } | |
7502 | ||
afa0f557 | 7503 | static void raid5_free(struct mddev *mddev, void *priv) |
1da177e4 | 7504 | { |
afa0f557 | 7505 | struct r5conf *conf = priv; |
1da177e4 | 7506 | |
95fc17aa | 7507 | free_conf(conf); |
a64c876f | 7508 | mddev->to_remove = &raid5_attrs_group; |
1da177e4 LT |
7509 | } |
7510 | ||
849674e4 | 7511 | static void raid5_status(struct seq_file *seq, struct mddev *mddev) |
1da177e4 | 7512 | { |
d1688a6d | 7513 | struct r5conf *conf = mddev->private; |
1da177e4 LT |
7514 | int i; |
7515 | ||
9d8f0363 | 7516 | seq_printf(seq, " level %d, %dk chunk, algorithm %d", mddev->level, |
3cb5edf4 | 7517 | conf->chunk_sectors / 2, mddev->layout); |
02c2de8c | 7518 | seq_printf (seq, " [%d/%d] [", conf->raid_disks, conf->raid_disks - mddev->degraded); |
5fd13351 N |
7519 | rcu_read_lock(); |
7520 | for (i = 0; i < conf->raid_disks; i++) { | |
7521 | struct md_rdev *rdev = rcu_dereference(conf->disks[i].rdev); | |
7522 | seq_printf (seq, "%s", rdev && test_bit(In_sync, &rdev->flags) ? "U" : "_"); | |
7523 | } | |
7524 | rcu_read_unlock(); | |
1da177e4 | 7525 | seq_printf (seq, "]"); |
1da177e4 LT |
7526 | } |
7527 | ||
d1688a6d | 7528 | static void print_raid5_conf (struct r5conf *conf) |
1da177e4 LT |
7529 | { |
7530 | int i; | |
7531 | struct disk_info *tmp; | |
7532 | ||
cc6167b4 | 7533 | pr_debug("RAID conf printout:\n"); |
1da177e4 | 7534 | if (!conf) { |
cc6167b4 | 7535 | pr_debug("(conf==NULL)\n"); |
1da177e4 LT |
7536 | return; |
7537 | } | |
cc6167b4 | 7538 | pr_debug(" --- level:%d rd:%d wd:%d\n", conf->level, |
0c55e022 N |
7539 | conf->raid_disks, |
7540 | conf->raid_disks - conf->mddev->degraded); | |
1da177e4 LT |
7541 | |
7542 | for (i = 0; i < conf->raid_disks; i++) { | |
7543 | char b[BDEVNAME_SIZE]; | |
7544 | tmp = conf->disks + i; | |
7545 | if (tmp->rdev) | |
cc6167b4 | 7546 | pr_debug(" disk %d, o:%d, dev:%s\n", |
0c55e022 N |
7547 | i, !test_bit(Faulty, &tmp->rdev->flags), |
7548 | bdevname(tmp->rdev->bdev, b)); | |
1da177e4 LT |
7549 | } |
7550 | } | |
7551 | ||
fd01b88c | 7552 | static int raid5_spare_active(struct mddev *mddev) |
1da177e4 LT |
7553 | { |
7554 | int i; | |
d1688a6d | 7555 | struct r5conf *conf = mddev->private; |
1da177e4 | 7556 | struct disk_info *tmp; |
6b965620 N |
7557 | int count = 0; |
7558 | unsigned long flags; | |
1da177e4 LT |
7559 | |
7560 | for (i = 0; i < conf->raid_disks; i++) { | |
7561 | tmp = conf->disks + i; | |
dd054fce N |
7562 | if (tmp->replacement |
7563 | && tmp->replacement->recovery_offset == MaxSector | |
7564 | && !test_bit(Faulty, &tmp->replacement->flags) | |
7565 | && !test_and_set_bit(In_sync, &tmp->replacement->flags)) { | |
7566 | /* Replacement has just become active. */ | |
7567 | if (!tmp->rdev | |
7568 | || !test_and_clear_bit(In_sync, &tmp->rdev->flags)) | |
7569 | count++; | |
7570 | if (tmp->rdev) { | |
7571 | /* Replaced device not technically faulty, | |
7572 | * but we need to be sure it gets removed | |
7573 | * and never re-added. | |
7574 | */ | |
7575 | set_bit(Faulty, &tmp->rdev->flags); | |
7576 | sysfs_notify_dirent_safe( | |
7577 | tmp->rdev->sysfs_state); | |
7578 | } | |
7579 | sysfs_notify_dirent_safe(tmp->replacement->sysfs_state); | |
7580 | } else if (tmp->rdev | |
70fffd0b | 7581 | && tmp->rdev->recovery_offset == MaxSector |
b2d444d7 | 7582 | && !test_bit(Faulty, &tmp->rdev->flags) |
c04be0aa | 7583 | && !test_and_set_bit(In_sync, &tmp->rdev->flags)) { |
6b965620 | 7584 | count++; |
43c73ca4 | 7585 | sysfs_notify_dirent_safe(tmp->rdev->sysfs_state); |
1da177e4 LT |
7586 | } |
7587 | } | |
6b965620 | 7588 | spin_lock_irqsave(&conf->device_lock, flags); |
2e38a37f | 7589 | mddev->degraded = raid5_calc_degraded(conf); |
6b965620 | 7590 | spin_unlock_irqrestore(&conf->device_lock, flags); |
1da177e4 | 7591 | print_raid5_conf(conf); |
6b965620 | 7592 | return count; |
1da177e4 LT |
7593 | } |
7594 | ||
b8321b68 | 7595 | static int raid5_remove_disk(struct mddev *mddev, struct md_rdev *rdev) |
1da177e4 | 7596 | { |
d1688a6d | 7597 | struct r5conf *conf = mddev->private; |
1da177e4 | 7598 | int err = 0; |
b8321b68 | 7599 | int number = rdev->raid_disk; |
657e3e4d | 7600 | struct md_rdev **rdevp; |
1da177e4 LT |
7601 | struct disk_info *p = conf->disks + number; |
7602 | ||
7603 | print_raid5_conf(conf); | |
f6b6ec5c | 7604 | if (test_bit(Journal, &rdev->flags) && conf->log) { |
c2bb6242 | 7605 | /* |
f6b6ec5c SL |
7606 | * we can't wait pending write here, as this is called in |
7607 | * raid5d, wait will deadlock. | |
84dd97a6 N |
7608 | * neilb: there is no locking about new writes here, |
7609 | * so this cannot be safe. | |
c2bb6242 | 7610 | */ |
70d466f7 SL |
7611 | if (atomic_read(&conf->active_stripes) || |
7612 | atomic_read(&conf->r5c_cached_full_stripes) || | |
7613 | atomic_read(&conf->r5c_cached_partial_stripes)) { | |
f6b6ec5c | 7614 | return -EBUSY; |
84dd97a6 | 7615 | } |
ff875738 | 7616 | log_exit(conf); |
f6b6ec5c | 7617 | return 0; |
c2bb6242 | 7618 | } |
657e3e4d N |
7619 | if (rdev == p->rdev) |
7620 | rdevp = &p->rdev; | |
7621 | else if (rdev == p->replacement) | |
7622 | rdevp = &p->replacement; | |
7623 | else | |
7624 | return 0; | |
7625 | ||
7626 | if (number >= conf->raid_disks && | |
7627 | conf->reshape_progress == MaxSector) | |
7628 | clear_bit(In_sync, &rdev->flags); | |
7629 | ||
7630 | if (test_bit(In_sync, &rdev->flags) || | |
7631 | atomic_read(&rdev->nr_pending)) { | |
7632 | err = -EBUSY; | |
7633 | goto abort; | |
7634 | } | |
7635 | /* Only remove non-faulty devices if recovery | |
7636 | * isn't possible. | |
7637 | */ | |
7638 | if (!test_bit(Faulty, &rdev->flags) && | |
7639 | mddev->recovery_disabled != conf->recovery_disabled && | |
7640 | !has_failed(conf) && | |
dd054fce | 7641 | (!p->replacement || p->replacement == rdev) && |
657e3e4d N |
7642 | number < conf->raid_disks) { |
7643 | err = -EBUSY; | |
7644 | goto abort; | |
7645 | } | |
7646 | *rdevp = NULL; | |
d787be40 N |
7647 | if (!test_bit(RemoveSynchronized, &rdev->flags)) { |
7648 | synchronize_rcu(); | |
7649 | if (atomic_read(&rdev->nr_pending)) { | |
7650 | /* lost the race, try later */ | |
7651 | err = -EBUSY; | |
7652 | *rdevp = rdev; | |
7653 | } | |
7654 | } | |
6358c239 AP |
7655 | if (!err) { |
7656 | err = log_modify(conf, rdev, false); | |
7657 | if (err) | |
7658 | goto abort; | |
7659 | } | |
d787be40 | 7660 | if (p->replacement) { |
dd054fce N |
7661 | /* We must have just cleared 'rdev' */ |
7662 | p->rdev = p->replacement; | |
7663 | clear_bit(Replacement, &p->replacement->flags); | |
7664 | smp_mb(); /* Make sure other CPUs may see both as identical | |
7665 | * but will never see neither - if they are careful | |
7666 | */ | |
7667 | p->replacement = NULL; | |
6358c239 AP |
7668 | |
7669 | if (!err) | |
7670 | err = log_modify(conf, p->rdev, true); | |
e5bc9c3c GJ |
7671 | } |
7672 | ||
7673 | clear_bit(WantReplacement, &rdev->flags); | |
1da177e4 LT |
7674 | abort: |
7675 | ||
7676 | print_raid5_conf(conf); | |
7677 | return err; | |
7678 | } | |
7679 | ||
fd01b88c | 7680 | static int raid5_add_disk(struct mddev *mddev, struct md_rdev *rdev) |
1da177e4 | 7681 | { |
d1688a6d | 7682 | struct r5conf *conf = mddev->private; |
d9771f5e | 7683 | int ret, err = -EEXIST; |
1da177e4 LT |
7684 | int disk; |
7685 | struct disk_info *p; | |
6c2fce2e NB |
7686 | int first = 0; |
7687 | int last = conf->raid_disks - 1; | |
1da177e4 | 7688 | |
f6b6ec5c | 7689 | if (test_bit(Journal, &rdev->flags)) { |
f6b6ec5c SL |
7690 | if (conf->log) |
7691 | return -EBUSY; | |
7692 | ||
7693 | rdev->raid_disk = 0; | |
7694 | /* | |
7695 | * The array is in readonly mode if journal is missing, so no | |
7696 | * write requests running. We should be safe | |
7697 | */ | |
d9771f5e XN |
7698 | ret = log_init(conf, rdev, false); |
7699 | if (ret) | |
7700 | return ret; | |
7701 | ||
7702 | ret = r5l_start(conf->log); | |
7703 | if (ret) | |
7704 | return ret; | |
7705 | ||
f6b6ec5c SL |
7706 | return 0; |
7707 | } | |
7f0da59b N |
7708 | if (mddev->recovery_disabled == conf->recovery_disabled) |
7709 | return -EBUSY; | |
7710 | ||
dc10c643 | 7711 | if (rdev->saved_raid_disk < 0 && has_failed(conf)) |
1da177e4 | 7712 | /* no point adding a device */ |
199050ea | 7713 | return -EINVAL; |
1da177e4 | 7714 | |
6c2fce2e NB |
7715 | if (rdev->raid_disk >= 0) |
7716 | first = last = rdev->raid_disk; | |
1da177e4 LT |
7717 | |
7718 | /* | |
16a53ecc N |
7719 | * find the disk ... but prefer rdev->saved_raid_disk |
7720 | * if possible. | |
1da177e4 | 7721 | */ |
16a53ecc | 7722 | if (rdev->saved_raid_disk >= 0 && |
6c2fce2e | 7723 | rdev->saved_raid_disk >= first && |
16a53ecc | 7724 | conf->disks[rdev->saved_raid_disk].rdev == NULL) |
5cfb22a1 N |
7725 | first = rdev->saved_raid_disk; |
7726 | ||
7727 | for (disk = first; disk <= last; disk++) { | |
7bfec5f3 N |
7728 | p = conf->disks + disk; |
7729 | if (p->rdev == NULL) { | |
b2d444d7 | 7730 | clear_bit(In_sync, &rdev->flags); |
1da177e4 | 7731 | rdev->raid_disk = disk; |
72626685 N |
7732 | if (rdev->saved_raid_disk != disk) |
7733 | conf->fullsync = 1; | |
d6065f7b | 7734 | rcu_assign_pointer(p->rdev, rdev); |
6358c239 AP |
7735 | |
7736 | err = log_modify(conf, rdev, true); | |
7737 | ||
5cfb22a1 | 7738 | goto out; |
1da177e4 | 7739 | } |
5cfb22a1 N |
7740 | } |
7741 | for (disk = first; disk <= last; disk++) { | |
7742 | p = conf->disks + disk; | |
7bfec5f3 N |
7743 | if (test_bit(WantReplacement, &p->rdev->flags) && |
7744 | p->replacement == NULL) { | |
7745 | clear_bit(In_sync, &rdev->flags); | |
7746 | set_bit(Replacement, &rdev->flags); | |
7747 | rdev->raid_disk = disk; | |
7748 | err = 0; | |
7749 | conf->fullsync = 1; | |
7750 | rcu_assign_pointer(p->replacement, rdev); | |
7751 | break; | |
7752 | } | |
7753 | } | |
5cfb22a1 | 7754 | out: |
1da177e4 | 7755 | print_raid5_conf(conf); |
199050ea | 7756 | return err; |
1da177e4 LT |
7757 | } |
7758 | ||
fd01b88c | 7759 | static int raid5_resize(struct mddev *mddev, sector_t sectors) |
1da177e4 LT |
7760 | { |
7761 | /* no resync is happening, and there is enough space | |
7762 | * on all devices, so we can resize. | |
7763 | * We need to make sure resync covers any new space. | |
7764 | * If the array is shrinking we should possibly wait until | |
7765 | * any io in the removed space completes, but it hardly seems | |
7766 | * worth it. | |
7767 | */ | |
a4a6125a | 7768 | sector_t newsize; |
3cb5edf4 N |
7769 | struct r5conf *conf = mddev->private; |
7770 | ||
e254de6b | 7771 | if (raid5_has_log(conf) || raid5_has_ppl(conf)) |
713cf5a6 | 7772 | return -EINVAL; |
3cb5edf4 | 7773 | sectors &= ~((sector_t)conf->chunk_sectors - 1); |
a4a6125a N |
7774 | newsize = raid5_size(mddev, sectors, mddev->raid_disks); |
7775 | if (mddev->external_size && | |
7776 | mddev->array_sectors > newsize) | |
b522adcd | 7777 | return -EINVAL; |
a4a6125a | 7778 | if (mddev->bitmap) { |
e64e4018 | 7779 | int ret = md_bitmap_resize(mddev->bitmap, sectors, 0, 0); |
a4a6125a N |
7780 | if (ret) |
7781 | return ret; | |
7782 | } | |
7783 | md_set_array_sectors(mddev, newsize); | |
b098636c N |
7784 | if (sectors > mddev->dev_sectors && |
7785 | mddev->recovery_cp > mddev->dev_sectors) { | |
58c0fed4 | 7786 | mddev->recovery_cp = mddev->dev_sectors; |
1da177e4 LT |
7787 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
7788 | } | |
58c0fed4 | 7789 | mddev->dev_sectors = sectors; |
4b5c7ae8 | 7790 | mddev->resync_max_sectors = sectors; |
1da177e4 LT |
7791 | return 0; |
7792 | } | |
7793 | ||
fd01b88c | 7794 | static int check_stripe_cache(struct mddev *mddev) |
01ee22b4 N |
7795 | { |
7796 | /* Can only proceed if there are plenty of stripe_heads. | |
7797 | * We need a minimum of one full stripe,, and for sensible progress | |
7798 | * it is best to have about 4 times that. | |
7799 | * If we require 4 times, then the default 256 4K stripe_heads will | |
7800 | * allow for chunk sizes up to 256K, which is probably OK. | |
7801 | * If the chunk size is greater, user-space should request more | |
7802 | * stripe_heads first. | |
7803 | */ | |
d1688a6d | 7804 | struct r5conf *conf = mddev->private; |
01ee22b4 | 7805 | if (((mddev->chunk_sectors << 9) / STRIPE_SIZE) * 4 |
edbe83ab | 7806 | > conf->min_nr_stripes || |
01ee22b4 | 7807 | ((mddev->new_chunk_sectors << 9) / STRIPE_SIZE) * 4 |
edbe83ab | 7808 | > conf->min_nr_stripes) { |
cc6167b4 N |
7809 | pr_warn("md/raid:%s: reshape: not enough stripes. Needed %lu\n", |
7810 | mdname(mddev), | |
7811 | ((max(mddev->chunk_sectors, mddev->new_chunk_sectors) << 9) | |
7812 | / STRIPE_SIZE)*4); | |
01ee22b4 N |
7813 | return 0; |
7814 | } | |
7815 | return 1; | |
7816 | } | |
7817 | ||
fd01b88c | 7818 | static int check_reshape(struct mddev *mddev) |
29269553 | 7819 | { |
d1688a6d | 7820 | struct r5conf *conf = mddev->private; |
29269553 | 7821 | |
e254de6b | 7822 | if (raid5_has_log(conf) || raid5_has_ppl(conf)) |
713cf5a6 | 7823 | return -EINVAL; |
88ce4930 N |
7824 | if (mddev->delta_disks == 0 && |
7825 | mddev->new_layout == mddev->layout && | |
664e7c41 | 7826 | mddev->new_chunk_sectors == mddev->chunk_sectors) |
50ac168a | 7827 | return 0; /* nothing to do */ |
674806d6 | 7828 | if (has_failed(conf)) |
ec32a2bd | 7829 | return -EINVAL; |
fdcfbbb6 | 7830 | if (mddev->delta_disks < 0 && mddev->reshape_position == MaxSector) { |
ec32a2bd N |
7831 | /* We might be able to shrink, but the devices must |
7832 | * be made bigger first. | |
7833 | * For raid6, 4 is the minimum size. | |
7834 | * Otherwise 2 is the minimum | |
7835 | */ | |
7836 | int min = 2; | |
7837 | if (mddev->level == 6) | |
7838 | min = 4; | |
7839 | if (mddev->raid_disks + mddev->delta_disks < min) | |
7840 | return -EINVAL; | |
7841 | } | |
29269553 | 7842 | |
01ee22b4 | 7843 | if (!check_stripe_cache(mddev)) |
29269553 | 7844 | return -ENOSPC; |
29269553 | 7845 | |
738a2738 N |
7846 | if (mddev->new_chunk_sectors > mddev->chunk_sectors || |
7847 | mddev->delta_disks > 0) | |
7848 | if (resize_chunks(conf, | |
7849 | conf->previous_raid_disks | |
7850 | + max(0, mddev->delta_disks), | |
7851 | max(mddev->new_chunk_sectors, | |
7852 | mddev->chunk_sectors) | |
7853 | ) < 0) | |
7854 | return -ENOMEM; | |
845b9e22 AP |
7855 | |
7856 | if (conf->previous_raid_disks + mddev->delta_disks <= conf->pool_size) | |
7857 | return 0; /* never bother to shrink */ | |
e56108d6 N |
7858 | return resize_stripes(conf, (conf->previous_raid_disks |
7859 | + mddev->delta_disks)); | |
63c70c4f N |
7860 | } |
7861 | ||
fd01b88c | 7862 | static int raid5_start_reshape(struct mddev *mddev) |
63c70c4f | 7863 | { |
d1688a6d | 7864 | struct r5conf *conf = mddev->private; |
3cb03002 | 7865 | struct md_rdev *rdev; |
63c70c4f | 7866 | int spares = 0; |
c04be0aa | 7867 | unsigned long flags; |
63c70c4f | 7868 | |
f416885e | 7869 | if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) |
63c70c4f N |
7870 | return -EBUSY; |
7871 | ||
01ee22b4 N |
7872 | if (!check_stripe_cache(mddev)) |
7873 | return -ENOSPC; | |
7874 | ||
30b67645 N |
7875 | if (has_failed(conf)) |
7876 | return -EINVAL; | |
7877 | ||
c6563a8c | 7878 | rdev_for_each(rdev, mddev) { |
469518a3 N |
7879 | if (!test_bit(In_sync, &rdev->flags) |
7880 | && !test_bit(Faulty, &rdev->flags)) | |
29269553 | 7881 | spares++; |
c6563a8c | 7882 | } |
63c70c4f | 7883 | |
f416885e | 7884 | if (spares - mddev->degraded < mddev->delta_disks - conf->max_degraded) |
29269553 N |
7885 | /* Not enough devices even to make a degraded array |
7886 | * of that size | |
7887 | */ | |
7888 | return -EINVAL; | |
7889 | ||
ec32a2bd N |
7890 | /* Refuse to reduce size of the array. Any reductions in |
7891 | * array size must be through explicit setting of array_size | |
7892 | * attribute. | |
7893 | */ | |
7894 | if (raid5_size(mddev, 0, conf->raid_disks + mddev->delta_disks) | |
7895 | < mddev->array_sectors) { | |
cc6167b4 N |
7896 | pr_warn("md/raid:%s: array size must be reduced before number of disks\n", |
7897 | mdname(mddev)); | |
ec32a2bd N |
7898 | return -EINVAL; |
7899 | } | |
7900 | ||
f6705578 | 7901 | atomic_set(&conf->reshape_stripes, 0); |
29269553 | 7902 | spin_lock_irq(&conf->device_lock); |
c46501b2 | 7903 | write_seqcount_begin(&conf->gen_lock); |
29269553 | 7904 | conf->previous_raid_disks = conf->raid_disks; |
63c70c4f | 7905 | conf->raid_disks += mddev->delta_disks; |
09c9e5fa AN |
7906 | conf->prev_chunk_sectors = conf->chunk_sectors; |
7907 | conf->chunk_sectors = mddev->new_chunk_sectors; | |
88ce4930 N |
7908 | conf->prev_algo = conf->algorithm; |
7909 | conf->algorithm = mddev->new_layout; | |
05616be5 N |
7910 | conf->generation++; |
7911 | /* Code that selects data_offset needs to see the generation update | |
7912 | * if reshape_progress has been set - so a memory barrier needed. | |
7913 | */ | |
7914 | smp_mb(); | |
2c810cdd | 7915 | if (mddev->reshape_backwards) |
fef9c61f N |
7916 | conf->reshape_progress = raid5_size(mddev, 0, 0); |
7917 | else | |
7918 | conf->reshape_progress = 0; | |
7919 | conf->reshape_safe = conf->reshape_progress; | |
c46501b2 | 7920 | write_seqcount_end(&conf->gen_lock); |
29269553 N |
7921 | spin_unlock_irq(&conf->device_lock); |
7922 | ||
4d77e3ba N |
7923 | /* Now make sure any requests that proceeded on the assumption |
7924 | * the reshape wasn't running - like Discard or Read - have | |
7925 | * completed. | |
7926 | */ | |
7927 | mddev_suspend(mddev); | |
7928 | mddev_resume(mddev); | |
7929 | ||
29269553 N |
7930 | /* Add some new drives, as many as will fit. |
7931 | * We know there are enough to make the newly sized array work. | |
3424bf6a N |
7932 | * Don't add devices if we are reducing the number of |
7933 | * devices in the array. This is because it is not possible | |
7934 | * to correctly record the "partially reconstructed" state of | |
7935 | * such devices during the reshape and confusion could result. | |
29269553 | 7936 | */ |
87a8dec9 | 7937 | if (mddev->delta_disks >= 0) { |
dafb20fa | 7938 | rdev_for_each(rdev, mddev) |
87a8dec9 N |
7939 | if (rdev->raid_disk < 0 && |
7940 | !test_bit(Faulty, &rdev->flags)) { | |
7941 | if (raid5_add_disk(mddev, rdev) == 0) { | |
87a8dec9 | 7942 | if (rdev->raid_disk |
9d4c7d87 | 7943 | >= conf->previous_raid_disks) |
87a8dec9 | 7944 | set_bit(In_sync, &rdev->flags); |
9d4c7d87 | 7945 | else |
87a8dec9 | 7946 | rdev->recovery_offset = 0; |
36fad858 NK |
7947 | |
7948 | if (sysfs_link_rdev(mddev, rdev)) | |
87a8dec9 | 7949 | /* Failure here is OK */; |
50da0840 | 7950 | } |
87a8dec9 N |
7951 | } else if (rdev->raid_disk >= conf->previous_raid_disks |
7952 | && !test_bit(Faulty, &rdev->flags)) { | |
7953 | /* This is a spare that was manually added */ | |
7954 | set_bit(In_sync, &rdev->flags); | |
87a8dec9 | 7955 | } |
29269553 | 7956 | |
87a8dec9 N |
7957 | /* When a reshape changes the number of devices, |
7958 | * ->degraded is measured against the larger of the | |
7959 | * pre and post number of devices. | |
7960 | */ | |
ec32a2bd | 7961 | spin_lock_irqsave(&conf->device_lock, flags); |
2e38a37f | 7962 | mddev->degraded = raid5_calc_degraded(conf); |
ec32a2bd N |
7963 | spin_unlock_irqrestore(&conf->device_lock, flags); |
7964 | } | |
63c70c4f | 7965 | mddev->raid_disks = conf->raid_disks; |
e516402c | 7966 | mddev->reshape_position = conf->reshape_progress; |
2953079c | 7967 | set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags); |
f6705578 | 7968 | |
29269553 N |
7969 | clear_bit(MD_RECOVERY_SYNC, &mddev->recovery); |
7970 | clear_bit(MD_RECOVERY_CHECK, &mddev->recovery); | |
ea358cd0 | 7971 | clear_bit(MD_RECOVERY_DONE, &mddev->recovery); |
29269553 N |
7972 | set_bit(MD_RECOVERY_RESHAPE, &mddev->recovery); |
7973 | set_bit(MD_RECOVERY_RUNNING, &mddev->recovery); | |
7974 | mddev->sync_thread = md_register_thread(md_do_sync, mddev, | |
0da3c619 | 7975 | "reshape"); |
29269553 N |
7976 | if (!mddev->sync_thread) { |
7977 | mddev->recovery = 0; | |
7978 | spin_lock_irq(&conf->device_lock); | |
ba8805b9 | 7979 | write_seqcount_begin(&conf->gen_lock); |
29269553 | 7980 | mddev->raid_disks = conf->raid_disks = conf->previous_raid_disks; |
ba8805b9 N |
7981 | mddev->new_chunk_sectors = |
7982 | conf->chunk_sectors = conf->prev_chunk_sectors; | |
7983 | mddev->new_layout = conf->algorithm = conf->prev_algo; | |
05616be5 N |
7984 | rdev_for_each(rdev, mddev) |
7985 | rdev->new_data_offset = rdev->data_offset; | |
7986 | smp_wmb(); | |
ba8805b9 | 7987 | conf->generation --; |
fef9c61f | 7988 | conf->reshape_progress = MaxSector; |
1e3fa9bd | 7989 | mddev->reshape_position = MaxSector; |
ba8805b9 | 7990 | write_seqcount_end(&conf->gen_lock); |
29269553 N |
7991 | spin_unlock_irq(&conf->device_lock); |
7992 | return -EAGAIN; | |
7993 | } | |
c8f517c4 | 7994 | conf->reshape_checkpoint = jiffies; |
29269553 N |
7995 | md_wakeup_thread(mddev->sync_thread); |
7996 | md_new_event(mddev); | |
7997 | return 0; | |
7998 | } | |
29269553 | 7999 | |
ec32a2bd N |
8000 | /* This is called from the reshape thread and should make any |
8001 | * changes needed in 'conf' | |
8002 | */ | |
d1688a6d | 8003 | static void end_reshape(struct r5conf *conf) |
29269553 | 8004 | { |
29269553 | 8005 | |
f6705578 | 8006 | if (!test_bit(MD_RECOVERY_INTR, &conf->mddev->recovery)) { |
db0505d3 | 8007 | struct md_rdev *rdev; |
f6705578 | 8008 | |
f6705578 | 8009 | spin_lock_irq(&conf->device_lock); |
cea9c228 | 8010 | conf->previous_raid_disks = conf->raid_disks; |
b5d27718 | 8011 | md_finish_reshape(conf->mddev); |
05616be5 | 8012 | smp_wmb(); |
fef9c61f | 8013 | conf->reshape_progress = MaxSector; |
6cbd8148 | 8014 | conf->mddev->reshape_position = MaxSector; |
db0505d3 N |
8015 | rdev_for_each(rdev, conf->mddev) |
8016 | if (rdev->raid_disk >= 0 && | |
8017 | !test_bit(Journal, &rdev->flags) && | |
8018 | !test_bit(In_sync, &rdev->flags)) | |
8019 | rdev->recovery_offset = MaxSector; | |
f6705578 | 8020 | spin_unlock_irq(&conf->device_lock); |
b0f9ec04 | 8021 | wake_up(&conf->wait_for_overlap); |
16a53ecc N |
8022 | |
8023 | /* read-ahead size must cover two whole stripes, which is | |
8024 | * 2 * (datadisks) * chunksize where 'n' is the number of raid devices | |
8025 | */ | |
4a5add49 | 8026 | if (conf->mddev->queue) { |
cea9c228 | 8027 | int data_disks = conf->raid_disks - conf->max_degraded; |
09c9e5fa | 8028 | int stripe = data_disks * ((conf->chunk_sectors << 9) |
cea9c228 | 8029 | / PAGE_SIZE); |
dc3b17cc JK |
8030 | if (conf->mddev->queue->backing_dev_info->ra_pages < 2 * stripe) |
8031 | conf->mddev->queue->backing_dev_info->ra_pages = 2 * stripe; | |
16a53ecc | 8032 | } |
29269553 | 8033 | } |
29269553 N |
8034 | } |
8035 | ||
ec32a2bd N |
8036 | /* This is called from the raid5d thread with mddev_lock held. |
8037 | * It makes config changes to the device. | |
8038 | */ | |
fd01b88c | 8039 | static void raid5_finish_reshape(struct mddev *mddev) |
cea9c228 | 8040 | { |
d1688a6d | 8041 | struct r5conf *conf = mddev->private; |
cea9c228 N |
8042 | |
8043 | if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery)) { | |
8044 | ||
8876391e | 8045 | if (mddev->delta_disks <= 0) { |
ec32a2bd | 8046 | int d; |
908f4fbd | 8047 | spin_lock_irq(&conf->device_lock); |
2e38a37f | 8048 | mddev->degraded = raid5_calc_degraded(conf); |
908f4fbd | 8049 | spin_unlock_irq(&conf->device_lock); |
ec32a2bd N |
8050 | for (d = conf->raid_disks ; |
8051 | d < conf->raid_disks - mddev->delta_disks; | |
1a67dde0 | 8052 | d++) { |
3cb03002 | 8053 | struct md_rdev *rdev = conf->disks[d].rdev; |
da7613b8 N |
8054 | if (rdev) |
8055 | clear_bit(In_sync, &rdev->flags); | |
8056 | rdev = conf->disks[d].replacement; | |
8057 | if (rdev) | |
8058 | clear_bit(In_sync, &rdev->flags); | |
1a67dde0 | 8059 | } |
cea9c228 | 8060 | } |
88ce4930 | 8061 | mddev->layout = conf->algorithm; |
09c9e5fa | 8062 | mddev->chunk_sectors = conf->chunk_sectors; |
ec32a2bd N |
8063 | mddev->reshape_position = MaxSector; |
8064 | mddev->delta_disks = 0; | |
2c810cdd | 8065 | mddev->reshape_backwards = 0; |
cea9c228 N |
8066 | } |
8067 | } | |
8068 | ||
b03e0ccb | 8069 | static void raid5_quiesce(struct mddev *mddev, int quiesce) |
72626685 | 8070 | { |
d1688a6d | 8071 | struct r5conf *conf = mddev->private; |
72626685 | 8072 | |
b03e0ccb N |
8073 | if (quiesce) { |
8074 | /* stop all writes */ | |
566c09c5 | 8075 | lock_all_device_hash_locks_irq(conf); |
64bd660b N |
8076 | /* '2' tells resync/reshape to pause so that all |
8077 | * active stripes can drain | |
8078 | */ | |
a39f7afd | 8079 | r5c_flush_cache(conf, INT_MAX); |
64bd660b | 8080 | conf->quiesce = 2; |
b1b46486 | 8081 | wait_event_cmd(conf->wait_for_quiescent, |
46031f9a RBJ |
8082 | atomic_read(&conf->active_stripes) == 0 && |
8083 | atomic_read(&conf->active_aligned_reads) == 0, | |
566c09c5 SL |
8084 | unlock_all_device_hash_locks_irq(conf), |
8085 | lock_all_device_hash_locks_irq(conf)); | |
64bd660b | 8086 | conf->quiesce = 1; |
566c09c5 | 8087 | unlock_all_device_hash_locks_irq(conf); |
64bd660b N |
8088 | /* allow reshape to continue */ |
8089 | wake_up(&conf->wait_for_overlap); | |
b03e0ccb N |
8090 | } else { |
8091 | /* re-enable writes */ | |
566c09c5 | 8092 | lock_all_device_hash_locks_irq(conf); |
72626685 | 8093 | conf->quiesce = 0; |
b1b46486 | 8094 | wake_up(&conf->wait_for_quiescent); |
e464eafd | 8095 | wake_up(&conf->wait_for_overlap); |
566c09c5 | 8096 | unlock_all_device_hash_locks_irq(conf); |
72626685 | 8097 | } |
1532d9e8 | 8098 | log_quiesce(conf, quiesce); |
72626685 | 8099 | } |
b15c2e57 | 8100 | |
fd01b88c | 8101 | static void *raid45_takeover_raid0(struct mddev *mddev, int level) |
54071b38 | 8102 | { |
e373ab10 | 8103 | struct r0conf *raid0_conf = mddev->private; |
d76c8420 | 8104 | sector_t sectors; |
54071b38 | 8105 | |
f1b29bca | 8106 | /* for raid0 takeover only one zone is supported */ |
e373ab10 | 8107 | if (raid0_conf->nr_strip_zones > 1) { |
cc6167b4 N |
8108 | pr_warn("md/raid:%s: cannot takeover raid0 with more than one zone.\n", |
8109 | mdname(mddev)); | |
f1b29bca DW |
8110 | return ERR_PTR(-EINVAL); |
8111 | } | |
8112 | ||
e373ab10 N |
8113 | sectors = raid0_conf->strip_zone[0].zone_end; |
8114 | sector_div(sectors, raid0_conf->strip_zone[0].nb_dev); | |
3b71bd93 | 8115 | mddev->dev_sectors = sectors; |
f1b29bca | 8116 | mddev->new_level = level; |
54071b38 TM |
8117 | mddev->new_layout = ALGORITHM_PARITY_N; |
8118 | mddev->new_chunk_sectors = mddev->chunk_sectors; | |
8119 | mddev->raid_disks += 1; | |
8120 | mddev->delta_disks = 1; | |
8121 | /* make sure it will be not marked as dirty */ | |
8122 | mddev->recovery_cp = MaxSector; | |
8123 | ||
8124 | return setup_conf(mddev); | |
8125 | } | |
8126 | ||
fd01b88c | 8127 | static void *raid5_takeover_raid1(struct mddev *mddev) |
d562b0c4 N |
8128 | { |
8129 | int chunksect; | |
6995f0b2 | 8130 | void *ret; |
d562b0c4 N |
8131 | |
8132 | if (mddev->raid_disks != 2 || | |
8133 | mddev->degraded > 1) | |
8134 | return ERR_PTR(-EINVAL); | |
8135 | ||
8136 | /* Should check if there are write-behind devices? */ | |
8137 | ||
8138 | chunksect = 64*2; /* 64K by default */ | |
8139 | ||
8140 | /* The array must be an exact multiple of chunksize */ | |
8141 | while (chunksect && (mddev->array_sectors & (chunksect-1))) | |
8142 | chunksect >>= 1; | |
8143 | ||
8144 | if ((chunksect<<9) < STRIPE_SIZE) | |
8145 | /* array size does not allow a suitable chunk size */ | |
8146 | return ERR_PTR(-EINVAL); | |
8147 | ||
8148 | mddev->new_level = 5; | |
8149 | mddev->new_layout = ALGORITHM_LEFT_SYMMETRIC; | |
664e7c41 | 8150 | mddev->new_chunk_sectors = chunksect; |
d562b0c4 | 8151 | |
6995f0b2 | 8152 | ret = setup_conf(mddev); |
32cd7cbb | 8153 | if (!IS_ERR(ret)) |
394ed8e4 SL |
8154 | mddev_clear_unsupported_flags(mddev, |
8155 | UNSUPPORTED_MDDEV_FLAGS); | |
6995f0b2 | 8156 | return ret; |
d562b0c4 N |
8157 | } |
8158 | ||
fd01b88c | 8159 | static void *raid5_takeover_raid6(struct mddev *mddev) |
fc9739c6 N |
8160 | { |
8161 | int new_layout; | |
8162 | ||
8163 | switch (mddev->layout) { | |
8164 | case ALGORITHM_LEFT_ASYMMETRIC_6: | |
8165 | new_layout = ALGORITHM_LEFT_ASYMMETRIC; | |
8166 | break; | |
8167 | case ALGORITHM_RIGHT_ASYMMETRIC_6: | |
8168 | new_layout = ALGORITHM_RIGHT_ASYMMETRIC; | |
8169 | break; | |
8170 | case ALGORITHM_LEFT_SYMMETRIC_6: | |
8171 | new_layout = ALGORITHM_LEFT_SYMMETRIC; | |
8172 | break; | |
8173 | case ALGORITHM_RIGHT_SYMMETRIC_6: | |
8174 | new_layout = ALGORITHM_RIGHT_SYMMETRIC; | |
8175 | break; | |
8176 | case ALGORITHM_PARITY_0_6: | |
8177 | new_layout = ALGORITHM_PARITY_0; | |
8178 | break; | |
8179 | case ALGORITHM_PARITY_N: | |
8180 | new_layout = ALGORITHM_PARITY_N; | |
8181 | break; | |
8182 | default: | |
8183 | return ERR_PTR(-EINVAL); | |
8184 | } | |
8185 | mddev->new_level = 5; | |
8186 | mddev->new_layout = new_layout; | |
8187 | mddev->delta_disks = -1; | |
8188 | mddev->raid_disks -= 1; | |
8189 | return setup_conf(mddev); | |
8190 | } | |
8191 | ||
fd01b88c | 8192 | static int raid5_check_reshape(struct mddev *mddev) |
b3546035 | 8193 | { |
88ce4930 N |
8194 | /* For a 2-drive array, the layout and chunk size can be changed |
8195 | * immediately as not restriping is needed. | |
8196 | * For larger arrays we record the new value - after validation | |
8197 | * to be used by a reshape pass. | |
b3546035 | 8198 | */ |
d1688a6d | 8199 | struct r5conf *conf = mddev->private; |
597a711b | 8200 | int new_chunk = mddev->new_chunk_sectors; |
b3546035 | 8201 | |
597a711b | 8202 | if (mddev->new_layout >= 0 && !algorithm_valid_raid5(mddev->new_layout)) |
b3546035 N |
8203 | return -EINVAL; |
8204 | if (new_chunk > 0) { | |
0ba459d2 | 8205 | if (!is_power_of_2(new_chunk)) |
b3546035 | 8206 | return -EINVAL; |
597a711b | 8207 | if (new_chunk < (PAGE_SIZE>>9)) |
b3546035 | 8208 | return -EINVAL; |
597a711b | 8209 | if (mddev->array_sectors & (new_chunk-1)) |
b3546035 N |
8210 | /* not factor of array size */ |
8211 | return -EINVAL; | |
8212 | } | |
8213 | ||
8214 | /* They look valid */ | |
8215 | ||
88ce4930 | 8216 | if (mddev->raid_disks == 2) { |
597a711b N |
8217 | /* can make the change immediately */ |
8218 | if (mddev->new_layout >= 0) { | |
8219 | conf->algorithm = mddev->new_layout; | |
8220 | mddev->layout = mddev->new_layout; | |
88ce4930 N |
8221 | } |
8222 | if (new_chunk > 0) { | |
597a711b N |
8223 | conf->chunk_sectors = new_chunk ; |
8224 | mddev->chunk_sectors = new_chunk; | |
88ce4930 | 8225 | } |
2953079c | 8226 | set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags); |
88ce4930 | 8227 | md_wakeup_thread(mddev->thread); |
b3546035 | 8228 | } |
50ac168a | 8229 | return check_reshape(mddev); |
88ce4930 N |
8230 | } |
8231 | ||
fd01b88c | 8232 | static int raid6_check_reshape(struct mddev *mddev) |
88ce4930 | 8233 | { |
597a711b | 8234 | int new_chunk = mddev->new_chunk_sectors; |
50ac168a | 8235 | |
597a711b | 8236 | if (mddev->new_layout >= 0 && !algorithm_valid_raid6(mddev->new_layout)) |
88ce4930 | 8237 | return -EINVAL; |
b3546035 | 8238 | if (new_chunk > 0) { |
0ba459d2 | 8239 | if (!is_power_of_2(new_chunk)) |
88ce4930 | 8240 | return -EINVAL; |
597a711b | 8241 | if (new_chunk < (PAGE_SIZE >> 9)) |
88ce4930 | 8242 | return -EINVAL; |
597a711b | 8243 | if (mddev->array_sectors & (new_chunk-1)) |
88ce4930 N |
8244 | /* not factor of array size */ |
8245 | return -EINVAL; | |
b3546035 | 8246 | } |
88ce4930 N |
8247 | |
8248 | /* They look valid */ | |
50ac168a | 8249 | return check_reshape(mddev); |
b3546035 N |
8250 | } |
8251 | ||
fd01b88c | 8252 | static void *raid5_takeover(struct mddev *mddev) |
d562b0c4 N |
8253 | { |
8254 | /* raid5 can take over: | |
f1b29bca | 8255 | * raid0 - if there is only one strip zone - make it a raid4 layout |
d562b0c4 N |
8256 | * raid1 - if there are two drives. We need to know the chunk size |
8257 | * raid4 - trivial - just use a raid4 layout. | |
8258 | * raid6 - Providing it is a *_6 layout | |
d562b0c4 | 8259 | */ |
f1b29bca DW |
8260 | if (mddev->level == 0) |
8261 | return raid45_takeover_raid0(mddev, 5); | |
d562b0c4 N |
8262 | if (mddev->level == 1) |
8263 | return raid5_takeover_raid1(mddev); | |
e9d4758f N |
8264 | if (mddev->level == 4) { |
8265 | mddev->new_layout = ALGORITHM_PARITY_N; | |
8266 | mddev->new_level = 5; | |
8267 | return setup_conf(mddev); | |
8268 | } | |
fc9739c6 N |
8269 | if (mddev->level == 6) |
8270 | return raid5_takeover_raid6(mddev); | |
d562b0c4 N |
8271 | |
8272 | return ERR_PTR(-EINVAL); | |
8273 | } | |
8274 | ||
fd01b88c | 8275 | static void *raid4_takeover(struct mddev *mddev) |
a78d38a1 | 8276 | { |
f1b29bca DW |
8277 | /* raid4 can take over: |
8278 | * raid0 - if there is only one strip zone | |
8279 | * raid5 - if layout is right | |
a78d38a1 | 8280 | */ |
f1b29bca DW |
8281 | if (mddev->level == 0) |
8282 | return raid45_takeover_raid0(mddev, 4); | |
a78d38a1 N |
8283 | if (mddev->level == 5 && |
8284 | mddev->layout == ALGORITHM_PARITY_N) { | |
8285 | mddev->new_layout = 0; | |
8286 | mddev->new_level = 4; | |
8287 | return setup_conf(mddev); | |
8288 | } | |
8289 | return ERR_PTR(-EINVAL); | |
8290 | } | |
d562b0c4 | 8291 | |
84fc4b56 | 8292 | static struct md_personality raid5_personality; |
245f46c2 | 8293 | |
fd01b88c | 8294 | static void *raid6_takeover(struct mddev *mddev) |
245f46c2 N |
8295 | { |
8296 | /* Currently can only take over a raid5. We map the | |
8297 | * personality to an equivalent raid6 personality | |
8298 | * with the Q block at the end. | |
8299 | */ | |
8300 | int new_layout; | |
8301 | ||
8302 | if (mddev->pers != &raid5_personality) | |
8303 | return ERR_PTR(-EINVAL); | |
8304 | if (mddev->degraded > 1) | |
8305 | return ERR_PTR(-EINVAL); | |
8306 | if (mddev->raid_disks > 253) | |
8307 | return ERR_PTR(-EINVAL); | |
8308 | if (mddev->raid_disks < 3) | |
8309 | return ERR_PTR(-EINVAL); | |
8310 | ||
8311 | switch (mddev->layout) { | |
8312 | case ALGORITHM_LEFT_ASYMMETRIC: | |
8313 | new_layout = ALGORITHM_LEFT_ASYMMETRIC_6; | |
8314 | break; | |
8315 | case ALGORITHM_RIGHT_ASYMMETRIC: | |
8316 | new_layout = ALGORITHM_RIGHT_ASYMMETRIC_6; | |
8317 | break; | |
8318 | case ALGORITHM_LEFT_SYMMETRIC: | |
8319 | new_layout = ALGORITHM_LEFT_SYMMETRIC_6; | |
8320 | break; | |
8321 | case ALGORITHM_RIGHT_SYMMETRIC: | |
8322 | new_layout = ALGORITHM_RIGHT_SYMMETRIC_6; | |
8323 | break; | |
8324 | case ALGORITHM_PARITY_0: | |
8325 | new_layout = ALGORITHM_PARITY_0_6; | |
8326 | break; | |
8327 | case ALGORITHM_PARITY_N: | |
8328 | new_layout = ALGORITHM_PARITY_N; | |
8329 | break; | |
8330 | default: | |
8331 | return ERR_PTR(-EINVAL); | |
8332 | } | |
8333 | mddev->new_level = 6; | |
8334 | mddev->new_layout = new_layout; | |
8335 | mddev->delta_disks = 1; | |
8336 | mddev->raid_disks += 1; | |
8337 | return setup_conf(mddev); | |
8338 | } | |
8339 | ||
ba903a3e AP |
8340 | static int raid5_change_consistency_policy(struct mddev *mddev, const char *buf) |
8341 | { | |
8342 | struct r5conf *conf; | |
8343 | int err; | |
8344 | ||
8345 | err = mddev_lock(mddev); | |
8346 | if (err) | |
8347 | return err; | |
8348 | conf = mddev->private; | |
8349 | if (!conf) { | |
8350 | mddev_unlock(mddev); | |
8351 | return -ENODEV; | |
8352 | } | |
8353 | ||
845b9e22 | 8354 | if (strncmp(buf, "ppl", 3) == 0) { |
0bb0c105 | 8355 | /* ppl only works with RAID 5 */ |
845b9e22 AP |
8356 | if (!raid5_has_ppl(conf) && conf->level == 5) { |
8357 | err = log_init(conf, NULL, true); | |
8358 | if (!err) { | |
8359 | err = resize_stripes(conf, conf->pool_size); | |
8360 | if (err) | |
8361 | log_exit(conf); | |
8362 | } | |
0bb0c105 SL |
8363 | } else |
8364 | err = -EINVAL; | |
8365 | } else if (strncmp(buf, "resync", 6) == 0) { | |
8366 | if (raid5_has_ppl(conf)) { | |
8367 | mddev_suspend(mddev); | |
8368 | log_exit(conf); | |
0bb0c105 | 8369 | mddev_resume(mddev); |
845b9e22 | 8370 | err = resize_stripes(conf, conf->pool_size); |
0bb0c105 SL |
8371 | } else if (test_bit(MD_HAS_JOURNAL, &conf->mddev->flags) && |
8372 | r5l_log_disk_error(conf)) { | |
8373 | bool journal_dev_exists = false; | |
8374 | struct md_rdev *rdev; | |
8375 | ||
8376 | rdev_for_each(rdev, mddev) | |
8377 | if (test_bit(Journal, &rdev->flags)) { | |
8378 | journal_dev_exists = true; | |
8379 | break; | |
8380 | } | |
8381 | ||
8382 | if (!journal_dev_exists) { | |
8383 | mddev_suspend(mddev); | |
8384 | clear_bit(MD_HAS_JOURNAL, &mddev->flags); | |
8385 | mddev_resume(mddev); | |
8386 | } else /* need remove journal device first */ | |
8387 | err = -EBUSY; | |
8388 | } else | |
8389 | err = -EINVAL; | |
ba903a3e AP |
8390 | } else { |
8391 | err = -EINVAL; | |
8392 | } | |
8393 | ||
8394 | if (!err) | |
8395 | md_update_sb(mddev, 1); | |
8396 | ||
8397 | mddev_unlock(mddev); | |
8398 | ||
8399 | return err; | |
8400 | } | |
8401 | ||
d5d885fd SL |
8402 | static int raid5_start(struct mddev *mddev) |
8403 | { | |
8404 | struct r5conf *conf = mddev->private; | |
8405 | ||
8406 | return r5l_start(conf->log); | |
8407 | } | |
8408 | ||
84fc4b56 | 8409 | static struct md_personality raid6_personality = |
16a53ecc N |
8410 | { |
8411 | .name = "raid6", | |
8412 | .level = 6, | |
8413 | .owner = THIS_MODULE, | |
849674e4 SL |
8414 | .make_request = raid5_make_request, |
8415 | .run = raid5_run, | |
d5d885fd | 8416 | .start = raid5_start, |
afa0f557 | 8417 | .free = raid5_free, |
849674e4 SL |
8418 | .status = raid5_status, |
8419 | .error_handler = raid5_error, | |
16a53ecc N |
8420 | .hot_add_disk = raid5_add_disk, |
8421 | .hot_remove_disk= raid5_remove_disk, | |
8422 | .spare_active = raid5_spare_active, | |
849674e4 | 8423 | .sync_request = raid5_sync_request, |
16a53ecc | 8424 | .resize = raid5_resize, |
80c3a6ce | 8425 | .size = raid5_size, |
50ac168a | 8426 | .check_reshape = raid6_check_reshape, |
f416885e | 8427 | .start_reshape = raid5_start_reshape, |
cea9c228 | 8428 | .finish_reshape = raid5_finish_reshape, |
16a53ecc | 8429 | .quiesce = raid5_quiesce, |
245f46c2 | 8430 | .takeover = raid6_takeover, |
5c675f83 | 8431 | .congested = raid5_congested, |
0bb0c105 | 8432 | .change_consistency_policy = raid5_change_consistency_policy, |
16a53ecc | 8433 | }; |
84fc4b56 | 8434 | static struct md_personality raid5_personality = |
1da177e4 LT |
8435 | { |
8436 | .name = "raid5", | |
2604b703 | 8437 | .level = 5, |
1da177e4 | 8438 | .owner = THIS_MODULE, |
849674e4 SL |
8439 | .make_request = raid5_make_request, |
8440 | .run = raid5_run, | |
d5d885fd | 8441 | .start = raid5_start, |
afa0f557 | 8442 | .free = raid5_free, |
849674e4 SL |
8443 | .status = raid5_status, |
8444 | .error_handler = raid5_error, | |
1da177e4 LT |
8445 | .hot_add_disk = raid5_add_disk, |
8446 | .hot_remove_disk= raid5_remove_disk, | |
8447 | .spare_active = raid5_spare_active, | |
849674e4 | 8448 | .sync_request = raid5_sync_request, |
1da177e4 | 8449 | .resize = raid5_resize, |
80c3a6ce | 8450 | .size = raid5_size, |
63c70c4f N |
8451 | .check_reshape = raid5_check_reshape, |
8452 | .start_reshape = raid5_start_reshape, | |
cea9c228 | 8453 | .finish_reshape = raid5_finish_reshape, |
72626685 | 8454 | .quiesce = raid5_quiesce, |
d562b0c4 | 8455 | .takeover = raid5_takeover, |
5c675f83 | 8456 | .congested = raid5_congested, |
ba903a3e | 8457 | .change_consistency_policy = raid5_change_consistency_policy, |
1da177e4 LT |
8458 | }; |
8459 | ||
84fc4b56 | 8460 | static struct md_personality raid4_personality = |
1da177e4 | 8461 | { |
2604b703 N |
8462 | .name = "raid4", |
8463 | .level = 4, | |
8464 | .owner = THIS_MODULE, | |
849674e4 SL |
8465 | .make_request = raid5_make_request, |
8466 | .run = raid5_run, | |
d5d885fd | 8467 | .start = raid5_start, |
afa0f557 | 8468 | .free = raid5_free, |
849674e4 SL |
8469 | .status = raid5_status, |
8470 | .error_handler = raid5_error, | |
2604b703 N |
8471 | .hot_add_disk = raid5_add_disk, |
8472 | .hot_remove_disk= raid5_remove_disk, | |
8473 | .spare_active = raid5_spare_active, | |
849674e4 | 8474 | .sync_request = raid5_sync_request, |
2604b703 | 8475 | .resize = raid5_resize, |
80c3a6ce | 8476 | .size = raid5_size, |
3d37890b N |
8477 | .check_reshape = raid5_check_reshape, |
8478 | .start_reshape = raid5_start_reshape, | |
cea9c228 | 8479 | .finish_reshape = raid5_finish_reshape, |
2604b703 | 8480 | .quiesce = raid5_quiesce, |
a78d38a1 | 8481 | .takeover = raid4_takeover, |
5c675f83 | 8482 | .congested = raid5_congested, |
0bb0c105 | 8483 | .change_consistency_policy = raid5_change_consistency_policy, |
2604b703 N |
8484 | }; |
8485 | ||
8486 | static int __init raid5_init(void) | |
8487 | { | |
29c6d1bb SAS |
8488 | int ret; |
8489 | ||
851c30c9 SL |
8490 | raid5_wq = alloc_workqueue("raid5wq", |
8491 | WQ_UNBOUND|WQ_MEM_RECLAIM|WQ_CPU_INTENSIVE|WQ_SYSFS, 0); | |
8492 | if (!raid5_wq) | |
8493 | return -ENOMEM; | |
29c6d1bb SAS |
8494 | |
8495 | ret = cpuhp_setup_state_multi(CPUHP_MD_RAID5_PREPARE, | |
8496 | "md/raid5:prepare", | |
8497 | raid456_cpu_up_prepare, | |
8498 | raid456_cpu_dead); | |
8499 | if (ret) { | |
8500 | destroy_workqueue(raid5_wq); | |
8501 | return ret; | |
8502 | } | |
16a53ecc | 8503 | register_md_personality(&raid6_personality); |
2604b703 N |
8504 | register_md_personality(&raid5_personality); |
8505 | register_md_personality(&raid4_personality); | |
8506 | return 0; | |
1da177e4 LT |
8507 | } |
8508 | ||
2604b703 | 8509 | static void raid5_exit(void) |
1da177e4 | 8510 | { |
16a53ecc | 8511 | unregister_md_personality(&raid6_personality); |
2604b703 N |
8512 | unregister_md_personality(&raid5_personality); |
8513 | unregister_md_personality(&raid4_personality); | |
29c6d1bb | 8514 | cpuhp_remove_multi_state(CPUHP_MD_RAID5_PREPARE); |
851c30c9 | 8515 | destroy_workqueue(raid5_wq); |
1da177e4 LT |
8516 | } |
8517 | ||
8518 | module_init(raid5_init); | |
8519 | module_exit(raid5_exit); | |
8520 | MODULE_LICENSE("GPL"); | |
0efb9e61 | 8521 | MODULE_DESCRIPTION("RAID4/5/6 (striping with parity) personality for MD"); |
1da177e4 | 8522 | MODULE_ALIAS("md-personality-4"); /* RAID5 */ |
d9d166c2 N |
8523 | MODULE_ALIAS("md-raid5"); |
8524 | MODULE_ALIAS("md-raid4"); | |
2604b703 N |
8525 | MODULE_ALIAS("md-level-5"); |
8526 | MODULE_ALIAS("md-level-4"); | |
16a53ecc N |
8527 | MODULE_ALIAS("md-personality-8"); /* RAID6 */ |
8528 | MODULE_ALIAS("md-raid6"); | |
8529 | MODULE_ALIAS("md-level-6"); | |
8530 | ||
8531 | /* This used to be two separate modules, they were: */ | |
8532 | MODULE_ALIAS("raid5"); | |
8533 | MODULE_ALIAS("raid6"); |