Commit | Line | Data |
---|---|---|
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> |
5e2cf333 | 39 | #include <linux/delay.h> |
f6705578 | 40 | #include <linux/kthread.h> |
f701d589 | 41 | #include <linux/raid/pq.h> |
91c00924 | 42 | #include <linux/async_tx.h> |
056075c7 | 43 | #include <linux/module.h> |
07a3b417 | 44 | #include <linux/async.h> |
bff61975 | 45 | #include <linux/seq_file.h> |
36d1c647 | 46 | #include <linux/cpu.h> |
5a0e3ad6 | 47 | #include <linux/slab.h> |
8bda470e | 48 | #include <linux/ratelimit.h> |
851c30c9 | 49 | #include <linux/nodemask.h> |
3f07c014 | 50 | |
a9add5d9 | 51 | #include <trace/events/block.h> |
aaf9f12e | 52 | #include <linux/list_sort.h> |
a9add5d9 | 53 | |
43b2e5d8 | 54 | #include "md.h" |
bff61975 | 55 | #include "raid5.h" |
54071b38 | 56 | #include "raid0.h" |
935fe098 | 57 | #include "md-bitmap.h" |
ff875738 | 58 | #include "raid5-log.h" |
72626685 | 59 | |
394ed8e4 SL |
60 | #define UNSUPPORTED_MDDEV_FLAGS (1L << MD_FAILFAST_SUPPORTED) |
61 | ||
851c30c9 SL |
62 | #define cpu_to_group(cpu) cpu_to_node(cpu) |
63 | #define ANY_GROUP NUMA_NO_NODE | |
64 | ||
7e55c60a LG |
65 | #define RAID5_MAX_REQ_STRIPES 256 |
66 | ||
8e0e99ba N |
67 | static bool devices_handle_discard_safely = false; |
68 | module_param(devices_handle_discard_safely, bool, 0644); | |
69 | MODULE_PARM_DESC(devices_handle_discard_safely, | |
70 | "Set to Y if all devices in each array reliably return zeroes on reads from discarded regions"); | |
851c30c9 | 71 | static struct workqueue_struct *raid5_wq; |
1da177e4 | 72 | |
d1688a6d | 73 | static inline struct hlist_head *stripe_hash(struct r5conf *conf, sector_t sect) |
db298e19 | 74 | { |
c911c46c | 75 | int hash = (sect >> RAID5_STRIPE_SHIFT(conf)) & HASH_MASK; |
db298e19 N |
76 | return &conf->stripe_hashtbl[hash]; |
77 | } | |
1da177e4 | 78 | |
c911c46c | 79 | static inline int stripe_hash_locks_hash(struct r5conf *conf, sector_t sect) |
566c09c5 | 80 | { |
c911c46c | 81 | return (sect >> RAID5_STRIPE_SHIFT(conf)) & STRIPE_HASH_LOCKS_MASK; |
566c09c5 SL |
82 | } |
83 | ||
84 | static inline void lock_device_hash_lock(struct r5conf *conf, int hash) | |
4631f39f | 85 | __acquires(&conf->device_lock) |
566c09c5 SL |
86 | { |
87 | spin_lock_irq(conf->hash_locks + hash); | |
88 | spin_lock(&conf->device_lock); | |
89 | } | |
90 | ||
91 | static inline void unlock_device_hash_lock(struct r5conf *conf, int hash) | |
4631f39f | 92 | __releases(&conf->device_lock) |
566c09c5 SL |
93 | { |
94 | spin_unlock(&conf->device_lock); | |
95 | spin_unlock_irq(conf->hash_locks + hash); | |
96 | } | |
97 | ||
98 | static inline void lock_all_device_hash_locks_irq(struct r5conf *conf) | |
4631f39f | 99 | __acquires(&conf->device_lock) |
566c09c5 SL |
100 | { |
101 | int i; | |
3d05f3ae | 102 | spin_lock_irq(conf->hash_locks); |
566c09c5 SL |
103 | for (i = 1; i < NR_STRIPE_HASH_LOCKS; i++) |
104 | spin_lock_nest_lock(conf->hash_locks + i, conf->hash_locks); | |
105 | spin_lock(&conf->device_lock); | |
106 | } | |
107 | ||
108 | static inline void unlock_all_device_hash_locks_irq(struct r5conf *conf) | |
4631f39f | 109 | __releases(&conf->device_lock) |
566c09c5 SL |
110 | { |
111 | int i; | |
112 | spin_unlock(&conf->device_lock); | |
3d05f3ae JC |
113 | for (i = NR_STRIPE_HASH_LOCKS - 1; i; i--) |
114 | spin_unlock(conf->hash_locks + i); | |
115 | spin_unlock_irq(conf->hash_locks); | |
566c09c5 SL |
116 | } |
117 | ||
d0dabf7e N |
118 | /* Find first data disk in a raid6 stripe */ |
119 | static inline int raid6_d0(struct stripe_head *sh) | |
120 | { | |
67cc2b81 N |
121 | if (sh->ddf_layout) |
122 | /* ddf always start from first device */ | |
123 | return 0; | |
124 | /* md starts just after Q block */ | |
d0dabf7e N |
125 | if (sh->qd_idx == sh->disks - 1) |
126 | return 0; | |
127 | else | |
128 | return sh->qd_idx + 1; | |
129 | } | |
16a53ecc N |
130 | static inline int raid6_next_disk(int disk, int raid_disks) |
131 | { | |
132 | disk++; | |
133 | return (disk < raid_disks) ? disk : 0; | |
134 | } | |
a4456856 | 135 | |
d0dabf7e N |
136 | /* When walking through the disks in a raid5, starting at raid6_d0, |
137 | * We need to map each disk to a 'slot', where the data disks are slot | |
138 | * 0 .. raid_disks-3, the parity disk is raid_disks-2 and the Q disk | |
139 | * is raid_disks-1. This help does that mapping. | |
140 | */ | |
67cc2b81 N |
141 | static int raid6_idx_to_slot(int idx, struct stripe_head *sh, |
142 | int *count, int syndrome_disks) | |
d0dabf7e | 143 | { |
6629542e | 144 | int slot = *count; |
67cc2b81 | 145 | |
e4424fee | 146 | if (sh->ddf_layout) |
6629542e | 147 | (*count)++; |
d0dabf7e | 148 | if (idx == sh->pd_idx) |
67cc2b81 | 149 | return syndrome_disks; |
d0dabf7e | 150 | if (idx == sh->qd_idx) |
67cc2b81 | 151 | return syndrome_disks + 1; |
e4424fee | 152 | if (!sh->ddf_layout) |
6629542e | 153 | (*count)++; |
d0dabf7e N |
154 | return slot; |
155 | } | |
156 | ||
d1688a6d | 157 | static void print_raid5_conf (struct r5conf *conf); |
1da177e4 | 158 | |
600aa109 DW |
159 | static int stripe_operations_active(struct stripe_head *sh) |
160 | { | |
161 | return sh->check_state || sh->reconstruct_state || | |
162 | test_bit(STRIPE_BIOFILL_RUN, &sh->state) || | |
163 | test_bit(STRIPE_COMPUTE_RUN, &sh->state); | |
164 | } | |
165 | ||
535ae4eb SL |
166 | static bool stripe_is_lowprio(struct stripe_head *sh) |
167 | { | |
168 | return (test_bit(STRIPE_R5C_FULL_STRIPE, &sh->state) || | |
169 | test_bit(STRIPE_R5C_PARTIAL_STRIPE, &sh->state)) && | |
170 | !test_bit(STRIPE_R5C_CACHING, &sh->state); | |
171 | } | |
172 | ||
851c30c9 | 173 | static void raid5_wakeup_stripe_thread(struct stripe_head *sh) |
4631f39f | 174 | __must_hold(&sh->raid_conf->device_lock) |
851c30c9 SL |
175 | { |
176 | struct r5conf *conf = sh->raid_conf; | |
177 | struct r5worker_group *group; | |
bfc90cb0 | 178 | int thread_cnt; |
851c30c9 SL |
179 | int i, cpu = sh->cpu; |
180 | ||
181 | if (!cpu_online(cpu)) { | |
182 | cpu = cpumask_any(cpu_online_mask); | |
183 | sh->cpu = cpu; | |
184 | } | |
185 | ||
186 | if (list_empty(&sh->lru)) { | |
187 | struct r5worker_group *group; | |
188 | group = conf->worker_groups + cpu_to_group(cpu); | |
535ae4eb SL |
189 | if (stripe_is_lowprio(sh)) |
190 | list_add_tail(&sh->lru, &group->loprio_list); | |
191 | else | |
192 | list_add_tail(&sh->lru, &group->handle_list); | |
bfc90cb0 SL |
193 | group->stripes_cnt++; |
194 | sh->group = group; | |
851c30c9 SL |
195 | } |
196 | ||
197 | if (conf->worker_cnt_per_group == 0) { | |
198 | md_wakeup_thread(conf->mddev->thread); | |
199 | return; | |
200 | } | |
201 | ||
202 | group = conf->worker_groups + cpu_to_group(sh->cpu); | |
203 | ||
bfc90cb0 SL |
204 | group->workers[0].working = true; |
205 | /* at least one worker should run to avoid race */ | |
206 | queue_work_on(sh->cpu, raid5_wq, &group->workers[0].work); | |
207 | ||
208 | thread_cnt = group->stripes_cnt / MAX_STRIPE_BATCH - 1; | |
209 | /* wakeup more workers */ | |
210 | for (i = 1; i < conf->worker_cnt_per_group && thread_cnt > 0; i++) { | |
211 | if (group->workers[i].working == false) { | |
212 | group->workers[i].working = true; | |
213 | queue_work_on(sh->cpu, raid5_wq, | |
214 | &group->workers[i].work); | |
215 | thread_cnt--; | |
216 | } | |
217 | } | |
851c30c9 SL |
218 | } |
219 | ||
566c09c5 SL |
220 | static void do_release_stripe(struct r5conf *conf, struct stripe_head *sh, |
221 | struct list_head *temp_inactive_list) | |
4631f39f | 222 | __must_hold(&conf->device_lock) |
1da177e4 | 223 | { |
1e6d690b SL |
224 | int i; |
225 | int injournal = 0; /* number of date pages with R5_InJournal */ | |
226 | ||
4eb788df SL |
227 | BUG_ON(!list_empty(&sh->lru)); |
228 | BUG_ON(atomic_read(&conf->active_stripes)==0); | |
1e6d690b SL |
229 | |
230 | if (r5c_is_writeback(conf->log)) | |
231 | for (i = sh->disks; i--; ) | |
232 | if (test_bit(R5_InJournal, &sh->dev[i].flags)) | |
233 | injournal++; | |
a39f7afd | 234 | /* |
5ddf0440 SL |
235 | * In the following cases, the stripe cannot be released to cached |
236 | * lists. Therefore, we make the stripe write out and set | |
237 | * STRIPE_HANDLE: | |
238 | * 1. when quiesce in r5c write back; | |
239 | * 2. when resync is requested fot the stripe. | |
a39f7afd | 240 | */ |
5ddf0440 SL |
241 | if (test_bit(STRIPE_SYNC_REQUESTED, &sh->state) || |
242 | (conf->quiesce && r5c_is_writeback(conf->log) && | |
243 | !test_bit(STRIPE_HANDLE, &sh->state) && injournal != 0)) { | |
a39f7afd SL |
244 | if (test_bit(STRIPE_R5C_CACHING, &sh->state)) |
245 | r5c_make_stripe_write_out(sh); | |
246 | set_bit(STRIPE_HANDLE, &sh->state); | |
247 | } | |
1e6d690b | 248 | |
4eb788df SL |
249 | if (test_bit(STRIPE_HANDLE, &sh->state)) { |
250 | if (test_bit(STRIPE_DELAYED, &sh->state) && | |
ad3ab8b6 | 251 | !test_bit(STRIPE_PREREAD_ACTIVE, &sh->state)) |
4eb788df | 252 | list_add_tail(&sh->lru, &conf->delayed_list); |
ad3ab8b6 | 253 | else if (test_bit(STRIPE_BIT_DELAY, &sh->state) && |
4eb788df SL |
254 | sh->bm_seq - conf->seq_write > 0) |
255 | list_add_tail(&sh->lru, &conf->bitmap_list); | |
256 | else { | |
257 | clear_bit(STRIPE_DELAYED, &sh->state); | |
258 | clear_bit(STRIPE_BIT_DELAY, &sh->state); | |
851c30c9 | 259 | if (conf->worker_cnt_per_group == 0) { |
535ae4eb SL |
260 | if (stripe_is_lowprio(sh)) |
261 | list_add_tail(&sh->lru, | |
262 | &conf->loprio_list); | |
263 | else | |
264 | list_add_tail(&sh->lru, | |
265 | &conf->handle_list); | |
851c30c9 SL |
266 | } else { |
267 | raid5_wakeup_stripe_thread(sh); | |
268 | return; | |
269 | } | |
4eb788df SL |
270 | } |
271 | md_wakeup_thread(conf->mddev->thread); | |
272 | } else { | |
273 | BUG_ON(stripe_operations_active(sh)); | |
274 | if (test_and_clear_bit(STRIPE_PREREAD_ACTIVE, &sh->state)) | |
275 | if (atomic_dec_return(&conf->preread_active_stripes) | |
276 | < IO_THRESHOLD) | |
277 | md_wakeup_thread(conf->mddev->thread); | |
278 | atomic_dec(&conf->active_stripes); | |
1e6d690b SL |
279 | if (!test_bit(STRIPE_EXPANDING, &sh->state)) { |
280 | if (!r5c_is_writeback(conf->log)) | |
281 | list_add_tail(&sh->lru, temp_inactive_list); | |
282 | else { | |
283 | WARN_ON(test_bit(R5_InJournal, &sh->dev[sh->pd_idx].flags)); | |
284 | if (injournal == 0) | |
285 | list_add_tail(&sh->lru, temp_inactive_list); | |
286 | else if (injournal == conf->raid_disks - conf->max_degraded) { | |
287 | /* full stripe */ | |
288 | if (!test_and_set_bit(STRIPE_R5C_FULL_STRIPE, &sh->state)) | |
289 | atomic_inc(&conf->r5c_cached_full_stripes); | |
290 | if (test_and_clear_bit(STRIPE_R5C_PARTIAL_STRIPE, &sh->state)) | |
291 | atomic_dec(&conf->r5c_cached_partial_stripes); | |
292 | list_add_tail(&sh->lru, &conf->r5c_full_stripe_list); | |
a39f7afd | 293 | r5c_check_cached_full_stripe(conf); |
03b047f4 SL |
294 | } else |
295 | /* | |
296 | * STRIPE_R5C_PARTIAL_STRIPE is set in | |
297 | * r5c_try_caching_write(). No need to | |
298 | * set it again. | |
299 | */ | |
1e6d690b | 300 | list_add_tail(&sh->lru, &conf->r5c_partial_stripe_list); |
1e6d690b SL |
301 | } |
302 | } | |
1da177e4 LT |
303 | } |
304 | } | |
d0dabf7e | 305 | |
566c09c5 SL |
306 | static void __release_stripe(struct r5conf *conf, struct stripe_head *sh, |
307 | struct list_head *temp_inactive_list) | |
4631f39f | 308 | __must_hold(&conf->device_lock) |
4eb788df SL |
309 | { |
310 | if (atomic_dec_and_test(&sh->count)) | |
566c09c5 SL |
311 | do_release_stripe(conf, sh, temp_inactive_list); |
312 | } | |
313 | ||
314 | /* | |
315 | * @hash could be NR_STRIPE_HASH_LOCKS, then we have a list of inactive_list | |
316 | * | |
317 | * Be careful: Only one task can add/delete stripes from temp_inactive_list at | |
318 | * given time. Adding stripes only takes device lock, while deleting stripes | |
319 | * only takes hash lock. | |
320 | */ | |
321 | static void release_inactive_stripe_list(struct r5conf *conf, | |
322 | struct list_head *temp_inactive_list, | |
323 | int hash) | |
324 | { | |
325 | int size; | |
6ab2a4b8 | 326 | bool do_wakeup = false; |
566c09c5 SL |
327 | unsigned long flags; |
328 | ||
329 | if (hash == NR_STRIPE_HASH_LOCKS) { | |
330 | size = NR_STRIPE_HASH_LOCKS; | |
331 | hash = NR_STRIPE_HASH_LOCKS - 1; | |
332 | } else | |
333 | size = 1; | |
334 | while (size) { | |
335 | struct list_head *list = &temp_inactive_list[size - 1]; | |
336 | ||
337 | /* | |
6d036f7d | 338 | * We don't hold any lock here yet, raid5_get_active_stripe() might |
566c09c5 SL |
339 | * remove stripes from the list |
340 | */ | |
341 | if (!list_empty_careful(list)) { | |
342 | spin_lock_irqsave(conf->hash_locks + hash, flags); | |
4bda556a SL |
343 | if (list_empty(conf->inactive_list + hash) && |
344 | !list_empty(list)) | |
345 | atomic_dec(&conf->empty_inactive_list_nr); | |
566c09c5 | 346 | list_splice_tail_init(list, conf->inactive_list + hash); |
6ab2a4b8 | 347 | do_wakeup = true; |
566c09c5 SL |
348 | spin_unlock_irqrestore(conf->hash_locks + hash, flags); |
349 | } | |
350 | size--; | |
351 | hash--; | |
352 | } | |
353 | ||
354 | if (do_wakeup) { | |
6ab2a4b8 | 355 | wake_up(&conf->wait_for_stripe); |
b1b46486 YL |
356 | if (atomic_read(&conf->active_stripes) == 0) |
357 | wake_up(&conf->wait_for_quiescent); | |
566c09c5 SL |
358 | if (conf->retry_read_aligned) |
359 | md_wakeup_thread(conf->mddev->thread); | |
360 | } | |
4eb788df SL |
361 | } |
362 | ||
566c09c5 SL |
363 | static int release_stripe_list(struct r5conf *conf, |
364 | struct list_head *temp_inactive_list) | |
4631f39f | 365 | __must_hold(&conf->device_lock) |
773ca82f | 366 | { |
eae8263f | 367 | struct stripe_head *sh, *t; |
773ca82f SL |
368 | int count = 0; |
369 | struct llist_node *head; | |
370 | ||
371 | head = llist_del_all(&conf->released_stripes); | |
d265d9dc | 372 | head = llist_reverse_order(head); |
eae8263f | 373 | llist_for_each_entry_safe(sh, t, head, release_list) { |
566c09c5 SL |
374 | int hash; |
375 | ||
773ca82f SL |
376 | /* sh could be readded after STRIPE_ON_RELEASE_LIST is cleard */ |
377 | smp_mb(); | |
378 | clear_bit(STRIPE_ON_RELEASE_LIST, &sh->state); | |
379 | /* | |
380 | * Don't worry the bit is set here, because if the bit is set | |
381 | * again, the count is always > 1. This is true for | |
382 | * STRIPE_ON_UNPLUG_LIST bit too. | |
383 | */ | |
566c09c5 SL |
384 | hash = sh->hash_lock_index; |
385 | __release_stripe(conf, sh, &temp_inactive_list[hash]); | |
773ca82f SL |
386 | count++; |
387 | } | |
388 | ||
389 | return count; | |
390 | } | |
391 | ||
6d036f7d | 392 | void raid5_release_stripe(struct stripe_head *sh) |
1da177e4 | 393 | { |
d1688a6d | 394 | struct r5conf *conf = sh->raid_conf; |
1da177e4 | 395 | unsigned long flags; |
566c09c5 SL |
396 | struct list_head list; |
397 | int hash; | |
773ca82f | 398 | bool wakeup; |
16a53ecc | 399 | |
cf170f3f ES |
400 | /* Avoid release_list until the last reference. |
401 | */ | |
402 | if (atomic_add_unless(&sh->count, -1, 1)) | |
403 | return; | |
404 | ||
ad4068de | 405 | if (unlikely(!conf->mddev->thread) || |
406 | test_and_set_bit(STRIPE_ON_RELEASE_LIST, &sh->state)) | |
773ca82f SL |
407 | goto slow_path; |
408 | wakeup = llist_add(&sh->release_list, &conf->released_stripes); | |
409 | if (wakeup) | |
410 | md_wakeup_thread(conf->mddev->thread); | |
411 | return; | |
412 | slow_path: | |
773ca82f | 413 | /* we are ok here if STRIPE_ON_RELEASE_LIST is set or not */ |
685dbcaa | 414 | if (atomic_dec_and_lock_irqsave(&sh->count, &conf->device_lock, flags)) { |
566c09c5 SL |
415 | INIT_LIST_HEAD(&list); |
416 | hash = sh->hash_lock_index; | |
417 | do_release_stripe(conf, sh, &list); | |
08edaaa6 | 418 | spin_unlock_irqrestore(&conf->device_lock, flags); |
566c09c5 | 419 | release_inactive_stripe_list(conf, &list, hash); |
4eb788df | 420 | } |
1da177e4 LT |
421 | } |
422 | ||
fccddba0 | 423 | static inline void remove_hash(struct stripe_head *sh) |
1da177e4 | 424 | { |
45b4233c DW |
425 | pr_debug("remove_hash(), stripe %llu\n", |
426 | (unsigned long long)sh->sector); | |
1da177e4 | 427 | |
fccddba0 | 428 | hlist_del_init(&sh->hash); |
1da177e4 LT |
429 | } |
430 | ||
d1688a6d | 431 | static inline void insert_hash(struct r5conf *conf, struct stripe_head *sh) |
1da177e4 | 432 | { |
fccddba0 | 433 | struct hlist_head *hp = stripe_hash(conf, sh->sector); |
1da177e4 | 434 | |
45b4233c DW |
435 | pr_debug("insert_hash(), stripe %llu\n", |
436 | (unsigned long long)sh->sector); | |
1da177e4 | 437 | |
fccddba0 | 438 | hlist_add_head(&sh->hash, hp); |
1da177e4 LT |
439 | } |
440 | ||
1da177e4 | 441 | /* find an idle stripe, make sure it is unhashed, and return it. */ |
566c09c5 | 442 | static struct stripe_head *get_free_stripe(struct r5conf *conf, int hash) |
1da177e4 LT |
443 | { |
444 | struct stripe_head *sh = NULL; | |
445 | struct list_head *first; | |
446 | ||
566c09c5 | 447 | if (list_empty(conf->inactive_list + hash)) |
1da177e4 | 448 | goto out; |
566c09c5 | 449 | first = (conf->inactive_list + hash)->next; |
1da177e4 LT |
450 | sh = list_entry(first, struct stripe_head, lru); |
451 | list_del_init(first); | |
452 | remove_hash(sh); | |
453 | atomic_inc(&conf->active_stripes); | |
566c09c5 | 454 | BUG_ON(hash != sh->hash_lock_index); |
4bda556a SL |
455 | if (list_empty(conf->inactive_list + hash)) |
456 | atomic_inc(&conf->empty_inactive_list_nr); | |
1da177e4 LT |
457 | out: |
458 | return sh; | |
459 | } | |
460 | ||
046169f0 YY |
461 | #if PAGE_SIZE != DEFAULT_STRIPE_SIZE |
462 | static void free_stripe_pages(struct stripe_head *sh) | |
1da177e4 | 463 | { |
046169f0 | 464 | int i; |
1da177e4 | 465 | struct page *p; |
046169f0 YY |
466 | |
467 | /* Have not allocate page pool */ | |
468 | if (!sh->pages) | |
469 | return; | |
470 | ||
471 | for (i = 0; i < sh->nr_pages; i++) { | |
472 | p = sh->pages[i]; | |
473 | if (p) | |
474 | put_page(p); | |
475 | sh->pages[i] = NULL; | |
476 | } | |
477 | } | |
478 | ||
479 | static int alloc_stripe_pages(struct stripe_head *sh, gfp_t gfp) | |
480 | { | |
481 | int i; | |
482 | struct page *p; | |
483 | ||
484 | for (i = 0; i < sh->nr_pages; i++) { | |
485 | /* The page have allocated. */ | |
486 | if (sh->pages[i]) | |
487 | continue; | |
488 | ||
489 | p = alloc_page(gfp); | |
490 | if (!p) { | |
491 | free_stripe_pages(sh); | |
492 | return -ENOMEM; | |
493 | } | |
494 | sh->pages[i] = p; | |
495 | } | |
496 | return 0; | |
497 | } | |
498 | ||
499 | static int | |
500 | init_stripe_shared_pages(struct stripe_head *sh, struct r5conf *conf, int disks) | |
501 | { | |
502 | int nr_pages, cnt; | |
503 | ||
504 | if (sh->pages) | |
505 | return 0; | |
506 | ||
507 | /* Each of the sh->dev[i] need one conf->stripe_size */ | |
508 | cnt = PAGE_SIZE / conf->stripe_size; | |
509 | nr_pages = (disks + cnt - 1) / cnt; | |
510 | ||
511 | sh->pages = kcalloc(nr_pages, sizeof(struct page *), GFP_KERNEL); | |
512 | if (!sh->pages) | |
513 | return -ENOMEM; | |
514 | sh->nr_pages = nr_pages; | |
515 | sh->stripes_per_page = cnt; | |
516 | return 0; | |
517 | } | |
518 | #endif | |
519 | ||
520 | static void shrink_buffers(struct stripe_head *sh) | |
521 | { | |
1da177e4 | 522 | int i; |
e4e11e38 | 523 | int num = sh->raid_conf->pool_size; |
1da177e4 | 524 | |
046169f0 | 525 | #if PAGE_SIZE == DEFAULT_STRIPE_SIZE |
e4e11e38 | 526 | for (i = 0; i < num ; i++) { |
046169f0 YY |
527 | struct page *p; |
528 | ||
d592a996 | 529 | WARN_ON(sh->dev[i].page != sh->dev[i].orig_page); |
1da177e4 LT |
530 | p = sh->dev[i].page; |
531 | if (!p) | |
532 | continue; | |
533 | sh->dev[i].page = NULL; | |
2d1f3b5d | 534 | put_page(p); |
1da177e4 | 535 | } |
046169f0 YY |
536 | #else |
537 | for (i = 0; i < num; i++) | |
538 | sh->dev[i].page = NULL; | |
539 | free_stripe_pages(sh); /* Free pages */ | |
540 | #endif | |
1da177e4 LT |
541 | } |
542 | ||
a9683a79 | 543 | static int grow_buffers(struct stripe_head *sh, gfp_t gfp) |
1da177e4 LT |
544 | { |
545 | int i; | |
e4e11e38 | 546 | int num = sh->raid_conf->pool_size; |
1da177e4 | 547 | |
046169f0 | 548 | #if PAGE_SIZE == DEFAULT_STRIPE_SIZE |
e4e11e38 | 549 | for (i = 0; i < num; i++) { |
1da177e4 LT |
550 | struct page *page; |
551 | ||
a9683a79 | 552 | if (!(page = alloc_page(gfp))) { |
1da177e4 LT |
553 | return 1; |
554 | } | |
555 | sh->dev[i].page = page; | |
d592a996 | 556 | sh->dev[i].orig_page = page; |
7aba13b7 | 557 | sh->dev[i].offset = 0; |
1da177e4 | 558 | } |
046169f0 YY |
559 | #else |
560 | if (alloc_stripe_pages(sh, gfp)) | |
561 | return -ENOMEM; | |
3418d036 | 562 | |
046169f0 YY |
563 | for (i = 0; i < num; i++) { |
564 | sh->dev[i].page = raid5_get_dev_page(sh, i); | |
565 | sh->dev[i].orig_page = sh->dev[i].page; | |
566 | sh->dev[i].offset = raid5_get_page_offset(sh, i); | |
567 | } | |
568 | #endif | |
1da177e4 LT |
569 | return 0; |
570 | } | |
571 | ||
d1688a6d | 572 | static void stripe_set_idx(sector_t stripe, struct r5conf *conf, int previous, |
911d4ee8 | 573 | struct stripe_head *sh); |
1da177e4 | 574 | |
b5663ba4 | 575 | static void init_stripe(struct stripe_head *sh, sector_t sector, int previous) |
1da177e4 | 576 | { |
d1688a6d | 577 | struct r5conf *conf = sh->raid_conf; |
566c09c5 | 578 | int i, seq; |
1da177e4 | 579 | |
78bafebd ES |
580 | BUG_ON(atomic_read(&sh->count) != 0); |
581 | BUG_ON(test_bit(STRIPE_HANDLE, &sh->state)); | |
600aa109 | 582 | BUG_ON(stripe_operations_active(sh)); |
59fc630b | 583 | BUG_ON(sh->batch_head); |
d84e0f10 | 584 | |
45b4233c | 585 | pr_debug("init_stripe called, stripe %llu\n", |
b8e6a15a | 586 | (unsigned long long)sector); |
566c09c5 SL |
587 | retry: |
588 | seq = read_seqcount_begin(&conf->gen_lock); | |
86b42c71 | 589 | sh->generation = conf->generation - previous; |
b5663ba4 | 590 | sh->disks = previous ? conf->previous_raid_disks : conf->raid_disks; |
1da177e4 | 591 | sh->sector = sector; |
911d4ee8 | 592 | stripe_set_idx(sector, conf, previous, sh); |
1da177e4 LT |
593 | sh->state = 0; |
594 | ||
7ecaa1e6 | 595 | for (i = sh->disks; i--; ) { |
1da177e4 LT |
596 | struct r5dev *dev = &sh->dev[i]; |
597 | ||
d84e0f10 | 598 | if (dev->toread || dev->read || dev->towrite || dev->written || |
1da177e4 | 599 | test_bit(R5_LOCKED, &dev->flags)) { |
cc6167b4 | 600 | pr_err("sector=%llx i=%d %p %p %p %p %d\n", |
1da177e4 | 601 | (unsigned long long)sh->sector, i, dev->toread, |
d84e0f10 | 602 | dev->read, dev->towrite, dev->written, |
1da177e4 | 603 | test_bit(R5_LOCKED, &dev->flags)); |
8cfa7b0f | 604 | WARN_ON(1); |
1da177e4 LT |
605 | } |
606 | dev->flags = 0; | |
27a4ff8f | 607 | dev->sector = raid5_compute_blocknr(sh, i, previous); |
1da177e4 | 608 | } |
566c09c5 SL |
609 | if (read_seqcount_retry(&conf->gen_lock, seq)) |
610 | goto retry; | |
7a87f434 | 611 | sh->overwrite_disks = 0; |
1da177e4 | 612 | insert_hash(conf, sh); |
851c30c9 | 613 | sh->cpu = smp_processor_id(); |
da41ba65 | 614 | set_bit(STRIPE_BATCH_READY, &sh->state); |
1da177e4 LT |
615 | } |
616 | ||
d1688a6d | 617 | static struct stripe_head *__find_stripe(struct r5conf *conf, sector_t sector, |
86b42c71 | 618 | short generation) |
1da177e4 LT |
619 | { |
620 | struct stripe_head *sh; | |
621 | ||
45b4233c | 622 | pr_debug("__find_stripe, sector %llu\n", (unsigned long long)sector); |
b67bfe0d | 623 | hlist_for_each_entry(sh, stripe_hash(conf, sector), hash) |
86b42c71 | 624 | if (sh->sector == sector && sh->generation == generation) |
1da177e4 | 625 | return sh; |
45b4233c | 626 | pr_debug("__stripe %llu not in cache\n", (unsigned long long)sector); |
1da177e4 LT |
627 | return NULL; |
628 | } | |
629 | ||
1baa1126 LG |
630 | static struct stripe_head *find_get_stripe(struct r5conf *conf, |
631 | sector_t sector, short generation, int hash) | |
632 | { | |
633 | int inc_empty_inactive_list_flag; | |
634 | struct stripe_head *sh; | |
635 | ||
636 | sh = __find_stripe(conf, sector, generation); | |
637 | if (!sh) | |
638 | return NULL; | |
639 | ||
640 | if (atomic_inc_not_zero(&sh->count)) | |
641 | return sh; | |
642 | ||
643 | /* | |
644 | * Slow path. The reference count is zero which means the stripe must | |
645 | * be on a list (sh->lru). Must remove the stripe from the list that | |
646 | * references it with the device_lock held. | |
647 | */ | |
648 | ||
649 | spin_lock(&conf->device_lock); | |
650 | if (!atomic_read(&sh->count)) { | |
651 | if (!test_bit(STRIPE_HANDLE, &sh->state)) | |
652 | atomic_inc(&conf->active_stripes); | |
653 | BUG_ON(list_empty(&sh->lru) && | |
654 | !test_bit(STRIPE_EXPANDING, &sh->state)); | |
655 | inc_empty_inactive_list_flag = 0; | |
656 | if (!list_empty(conf->inactive_list + hash)) | |
657 | inc_empty_inactive_list_flag = 1; | |
658 | list_del_init(&sh->lru); | |
659 | if (list_empty(conf->inactive_list + hash) && | |
660 | inc_empty_inactive_list_flag) | |
661 | atomic_inc(&conf->empty_inactive_list_nr); | |
662 | if (sh->group) { | |
663 | sh->group->stripes_cnt--; | |
664 | sh->group = NULL; | |
665 | } | |
666 | } | |
667 | atomic_inc(&sh->count); | |
668 | spin_unlock(&conf->device_lock); | |
669 | ||
670 | return sh; | |
671 | } | |
672 | ||
674806d6 N |
673 | /* |
674 | * Need to check if array has failed when deciding whether to: | |
675 | * - start an array | |
676 | * - remove non-faulty devices | |
677 | * - add a spare | |
678 | * - allow a reshape | |
679 | * This determination is simple when no reshape is happening. | |
680 | * However if there is a reshape, we need to carefully check | |
681 | * both the before and after sections. | |
682 | * This is because some failed devices may only affect one | |
683 | * of the two sections, and some non-in_sync devices may | |
684 | * be insync in the section most affected by failed devices. | |
4631f39f LG |
685 | * |
686 | * Most calls to this function hold &conf->device_lock. Calls | |
687 | * in raid5_run() do not require the lock as no other threads | |
688 | * have been started yet. | |
674806d6 | 689 | */ |
2e38a37f | 690 | int raid5_calc_degraded(struct r5conf *conf) |
674806d6 | 691 | { |
908f4fbd | 692 | int degraded, degraded2; |
674806d6 | 693 | int i; |
674806d6 N |
694 | |
695 | rcu_read_lock(); | |
696 | degraded = 0; | |
697 | for (i = 0; i < conf->previous_raid_disks; i++) { | |
3cb03002 | 698 | struct md_rdev *rdev = rcu_dereference(conf->disks[i].rdev); |
e5c86471 N |
699 | if (rdev && test_bit(Faulty, &rdev->flags)) |
700 | rdev = rcu_dereference(conf->disks[i].replacement); | |
674806d6 N |
701 | if (!rdev || test_bit(Faulty, &rdev->flags)) |
702 | degraded++; | |
703 | else if (test_bit(In_sync, &rdev->flags)) | |
704 | ; | |
705 | else | |
706 | /* not in-sync or faulty. | |
707 | * If the reshape increases the number of devices, | |
708 | * this is being recovered by the reshape, so | |
709 | * this 'previous' section is not in_sync. | |
710 | * If the number of devices is being reduced however, | |
711 | * the device can only be part of the array if | |
712 | * we are reverting a reshape, so this section will | |
713 | * be in-sync. | |
714 | */ | |
715 | if (conf->raid_disks >= conf->previous_raid_disks) | |
716 | degraded++; | |
717 | } | |
718 | rcu_read_unlock(); | |
908f4fbd N |
719 | if (conf->raid_disks == conf->previous_raid_disks) |
720 | return degraded; | |
674806d6 | 721 | rcu_read_lock(); |
908f4fbd | 722 | degraded2 = 0; |
674806d6 | 723 | for (i = 0; i < conf->raid_disks; i++) { |
3cb03002 | 724 | struct md_rdev *rdev = rcu_dereference(conf->disks[i].rdev); |
e5c86471 N |
725 | if (rdev && test_bit(Faulty, &rdev->flags)) |
726 | rdev = rcu_dereference(conf->disks[i].replacement); | |
674806d6 | 727 | if (!rdev || test_bit(Faulty, &rdev->flags)) |
908f4fbd | 728 | degraded2++; |
674806d6 N |
729 | else if (test_bit(In_sync, &rdev->flags)) |
730 | ; | |
731 | else | |
732 | /* not in-sync or faulty. | |
733 | * If reshape increases the number of devices, this | |
734 | * section has already been recovered, else it | |
735 | * almost certainly hasn't. | |
736 | */ | |
737 | if (conf->raid_disks <= conf->previous_raid_disks) | |
908f4fbd | 738 | degraded2++; |
674806d6 N |
739 | } |
740 | rcu_read_unlock(); | |
908f4fbd N |
741 | if (degraded2 > degraded) |
742 | return degraded2; | |
743 | return degraded; | |
744 | } | |
745 | ||
57668f0a | 746 | static bool has_failed(struct r5conf *conf) |
908f4fbd | 747 | { |
57668f0a | 748 | int degraded = conf->mddev->degraded; |
908f4fbd | 749 | |
57668f0a MT |
750 | if (test_bit(MD_BROKEN, &conf->mddev->flags)) |
751 | return true; | |
908f4fbd | 752 | |
57668f0a MT |
753 | if (conf->mddev->reshape_position != MaxSector) |
754 | degraded = raid5_calc_degraded(conf); | |
755 | ||
756 | return degraded > conf->max_degraded; | |
674806d6 N |
757 | } |
758 | ||
df6b0e20 LG |
759 | enum stripe_result { |
760 | STRIPE_SUCCESS = 0, | |
761 | STRIPE_RETRY, | |
762 | STRIPE_SCHEDULE_AND_RETRY, | |
763 | STRIPE_FAIL, | |
764 | }; | |
765 | ||
766 | struct stripe_request_ctx { | |
767 | /* a reference to the last stripe_head for batching */ | |
768 | struct stripe_head *batch_last; | |
769 | ||
770 | /* first sector in the request */ | |
771 | sector_t first_sector; | |
772 | ||
773 | /* last sector in the request */ | |
774 | sector_t last_sector; | |
775 | ||
776 | /* | |
777 | * bitmap to track stripe sectors that have been added to stripes | |
778 | * add one to account for unaligned requests | |
779 | */ | |
780 | DECLARE_BITMAP(sectors_to_do, RAID5_MAX_REQ_STRIPES + 1); | |
781 | ||
782 | /* the request had REQ_PREFLUSH, cleared after the first stripe_head */ | |
783 | bool do_flush; | |
784 | }; | |
785 | ||
3514da58 LG |
786 | /* |
787 | * Block until another thread clears R5_INACTIVE_BLOCKED or | |
788 | * there are fewer than 3/4 the maximum number of active stripes | |
789 | * and there is an inactive stripe available. | |
790 | */ | |
791 | static bool is_inactive_blocked(struct r5conf *conf, int hash) | |
792 | { | |
3514da58 LG |
793 | if (list_empty(conf->inactive_list + hash)) |
794 | return false; | |
795 | ||
796 | if (!test_bit(R5_INACTIVE_BLOCKED, &conf->cache_state)) | |
797 | return true; | |
798 | ||
f9287c3e LG |
799 | return (atomic_read(&conf->active_stripes) < |
800 | (conf->max_nr_stripes * 3 / 4)); | |
3514da58 LG |
801 | } |
802 | ||
2f2d51ef | 803 | struct stripe_head *raid5_get_active_stripe(struct r5conf *conf, |
20313b1b | 804 | struct stripe_request_ctx *ctx, sector_t sector, |
2f2d51ef | 805 | unsigned int flags) |
1da177e4 LT |
806 | { |
807 | struct stripe_head *sh; | |
c911c46c | 808 | int hash = stripe_hash_locks_hash(conf, sector); |
2f2d51ef | 809 | int previous = !!(flags & R5_GAS_PREVIOUS); |
1da177e4 | 810 | |
45b4233c | 811 | pr_debug("get_stripe, sector %llu\n", (unsigned long long)sector); |
1da177e4 | 812 | |
566c09c5 | 813 | spin_lock_irq(conf->hash_locks + hash); |
1da177e4 | 814 | |
b6d56144 | 815 | for (;;) { |
2f2d51ef | 816 | if (!(flags & R5_GAS_NOQUIESCE) && conf->quiesce) { |
b6d56144 LG |
817 | /* |
818 | * Must release the reference to batch_last before | |
819 | * waiting, on quiesce, otherwise the batch_last will | |
820 | * hold a reference to a stripe and raid5_quiesce() | |
821 | * will deadlock waiting for active_stripes to go to | |
822 | * zero. | |
823 | */ | |
824 | if (ctx && ctx->batch_last) { | |
825 | raid5_release_stripe(ctx->batch_last); | |
826 | ctx->batch_last = NULL; | |
827 | } | |
828 | ||
829 | wait_event_lock_irq(conf->wait_for_quiescent, | |
830 | !conf->quiesce, | |
831 | *(conf->hash_locks + hash)); | |
20313b1b LG |
832 | } |
833 | ||
b6d56144 LG |
834 | sh = find_get_stripe(conf, sector, conf->generation - previous, |
835 | hash); | |
836 | if (sh) | |
837 | break; | |
838 | ||
839 | if (!test_bit(R5_INACTIVE_BLOCKED, &conf->cache_state)) { | |
840 | sh = get_free_stripe(conf, hash); | |
841 | if (sh) { | |
842 | r5c_check_stripe_cache_usage(conf); | |
843 | init_stripe(sh, sector, previous); | |
844 | atomic_inc(&sh->count); | |
845 | break; | |
846 | } | |
20313b1b | 847 | |
b6d56144 LG |
848 | if (!test_bit(R5_DID_ALLOC, &conf->cache_state)) |
849 | set_bit(R5_ALLOC_MORE, &conf->cache_state); | |
850 | } | |
1baa1126 | 851 | |
2f2d51ef | 852 | if (flags & R5_GAS_NOBLOCK) |
b6d56144 | 853 | break; |
5165ed40 | 854 | |
b6d56144 LG |
855 | set_bit(R5_INACTIVE_BLOCKED, &conf->cache_state); |
856 | r5l_wake_reclaim(conf->log, 0); | |
857 | wait_event_lock_irq(conf->wait_for_stripe, | |
858 | is_inactive_blocked(conf, hash), | |
859 | *(conf->hash_locks + hash)); | |
860 | clear_bit(R5_INACTIVE_BLOCKED, &conf->cache_state); | |
5165ed40 LG |
861 | } |
862 | ||
566c09c5 | 863 | spin_unlock_irq(conf->hash_locks + hash); |
1da177e4 LT |
864 | return sh; |
865 | } | |
866 | ||
7a87f434 | 867 | static bool is_full_stripe_write(struct stripe_head *sh) |
868 | { | |
869 | BUG_ON(sh->overwrite_disks > (sh->disks - sh->raid_conf->max_degraded)); | |
870 | return sh->overwrite_disks == (sh->disks - sh->raid_conf->max_degraded); | |
871 | } | |
872 | ||
59fc630b | 873 | static void lock_two_stripes(struct stripe_head *sh1, struct stripe_head *sh2) |
368ecade CH |
874 | __acquires(&sh1->stripe_lock) |
875 | __acquires(&sh2->stripe_lock) | |
59fc630b | 876 | { |
59fc630b | 877 | if (sh1 > sh2) { |
3d05f3ae | 878 | spin_lock_irq(&sh2->stripe_lock); |
59fc630b | 879 | spin_lock_nested(&sh1->stripe_lock, 1); |
880 | } else { | |
3d05f3ae | 881 | spin_lock_irq(&sh1->stripe_lock); |
59fc630b | 882 | spin_lock_nested(&sh2->stripe_lock, 1); |
883 | } | |
884 | } | |
885 | ||
886 | static void unlock_two_stripes(struct stripe_head *sh1, struct stripe_head *sh2) | |
368ecade CH |
887 | __releases(&sh1->stripe_lock) |
888 | __releases(&sh2->stripe_lock) | |
59fc630b | 889 | { |
890 | spin_unlock(&sh1->stripe_lock); | |
3d05f3ae | 891 | spin_unlock_irq(&sh2->stripe_lock); |
59fc630b | 892 | } |
893 | ||
894 | /* Only freshly new full stripe normal write stripe can be added to a batch list */ | |
895 | static bool stripe_can_batch(struct stripe_head *sh) | |
896 | { | |
9c3e333d SL |
897 | struct r5conf *conf = sh->raid_conf; |
898 | ||
e254de6b | 899 | if (raid5_has_log(conf) || raid5_has_ppl(conf)) |
9c3e333d | 900 | return false; |
59fc630b | 901 | return test_bit(STRIPE_BATCH_READY, &sh->state) && |
d0852df5 | 902 | !test_bit(STRIPE_BITMAP_PENDING, &sh->state) && |
59fc630b | 903 | is_full_stripe_write(sh); |
904 | } | |
905 | ||
906 | /* we only do back search */ | |
3312e6c8 LG |
907 | static void stripe_add_to_batch_list(struct r5conf *conf, |
908 | struct stripe_head *sh, struct stripe_head *last_sh) | |
59fc630b | 909 | { |
910 | struct stripe_head *head; | |
911 | sector_t head_sector, tmp_sec; | |
912 | int hash; | |
913 | int dd_idx; | |
914 | ||
59fc630b | 915 | /* Don't cross chunks, so stripe pd_idx/qd_idx is the same */ |
916 | tmp_sec = sh->sector; | |
917 | if (!sector_div(tmp_sec, conf->chunk_sectors)) | |
918 | return; | |
c911c46c | 919 | head_sector = sh->sector - RAID5_STRIPE_SECTORS(conf); |
59fc630b | 920 | |
3312e6c8 LG |
921 | if (last_sh && head_sector == last_sh->sector) { |
922 | head = last_sh; | |
923 | atomic_inc(&head->count); | |
924 | } else { | |
925 | hash = stripe_hash_locks_hash(conf, head_sector); | |
926 | spin_lock_irq(conf->hash_locks + hash); | |
927 | head = find_get_stripe(conf, head_sector, conf->generation, | |
928 | hash); | |
929 | spin_unlock_irq(conf->hash_locks + hash); | |
930 | if (!head) | |
931 | return; | |
932 | if (!stripe_can_batch(head)) | |
933 | goto out; | |
934 | } | |
59fc630b | 935 | |
936 | lock_two_stripes(head, sh); | |
937 | /* clear_batch_ready clear the flag */ | |
938 | if (!stripe_can_batch(head) || !stripe_can_batch(sh)) | |
939 | goto unlock_out; | |
940 | ||
941 | if (sh->batch_head) | |
942 | goto unlock_out; | |
943 | ||
944 | dd_idx = 0; | |
945 | while (dd_idx == sh->pd_idx || dd_idx == sh->qd_idx) | |
946 | dd_idx++; | |
1eff9d32 | 947 | if (head->dev[dd_idx].towrite->bi_opf != sh->dev[dd_idx].towrite->bi_opf || |
796a5cf0 | 948 | bio_op(head->dev[dd_idx].towrite) != bio_op(sh->dev[dd_idx].towrite)) |
59fc630b | 949 | goto unlock_out; |
950 | ||
951 | if (head->batch_head) { | |
952 | spin_lock(&head->batch_head->batch_lock); | |
953 | /* This batch list is already running */ | |
954 | if (!stripe_can_batch(head)) { | |
955 | spin_unlock(&head->batch_head->batch_lock); | |
956 | goto unlock_out; | |
957 | } | |
3664847d SL |
958 | /* |
959 | * We must assign batch_head of this stripe within the | |
960 | * batch_lock, otherwise clear_batch_ready of batch head | |
961 | * stripe could clear BATCH_READY bit of this stripe and | |
962 | * this stripe->batch_head doesn't get assigned, which | |
963 | * could confuse clear_batch_ready for this stripe | |
964 | */ | |
965 | sh->batch_head = head->batch_head; | |
59fc630b | 966 | |
967 | /* | |
968 | * at this point, head's BATCH_READY could be cleared, but we | |
969 | * can still add the stripe to batch list | |
970 | */ | |
971 | list_add(&sh->batch_list, &head->batch_list); | |
972 | spin_unlock(&head->batch_head->batch_lock); | |
59fc630b | 973 | } else { |
974 | head->batch_head = head; | |
975 | sh->batch_head = head->batch_head; | |
976 | spin_lock(&head->batch_lock); | |
977 | list_add_tail(&sh->batch_list, &head->batch_list); | |
978 | spin_unlock(&head->batch_lock); | |
979 | } | |
980 | ||
981 | if (test_and_clear_bit(STRIPE_PREREAD_ACTIVE, &sh->state)) | |
982 | if (atomic_dec_return(&conf->preread_active_stripes) | |
983 | < IO_THRESHOLD) | |
984 | md_wakeup_thread(conf->mddev->thread); | |
985 | ||
2b6b2457 N |
986 | if (test_and_clear_bit(STRIPE_BIT_DELAY, &sh->state)) { |
987 | int seq = sh->bm_seq; | |
988 | if (test_bit(STRIPE_BIT_DELAY, &sh->batch_head->state) && | |
989 | sh->batch_head->bm_seq > seq) | |
990 | seq = sh->batch_head->bm_seq; | |
991 | set_bit(STRIPE_BIT_DELAY, &sh->batch_head->state); | |
992 | sh->batch_head->bm_seq = seq; | |
993 | } | |
994 | ||
59fc630b | 995 | atomic_inc(&sh->count); |
996 | unlock_out: | |
997 | unlock_two_stripes(head, sh); | |
998 | out: | |
6d036f7d | 999 | raid5_release_stripe(head); |
59fc630b | 1000 | } |
1001 | ||
05616be5 N |
1002 | /* Determine if 'data_offset' or 'new_data_offset' should be used |
1003 | * in this stripe_head. | |
1004 | */ | |
1005 | static int use_new_offset(struct r5conf *conf, struct stripe_head *sh) | |
1006 | { | |
1007 | sector_t progress = conf->reshape_progress; | |
1008 | /* Need a memory barrier to make sure we see the value | |
1009 | * of conf->generation, or ->data_offset that was set before | |
1010 | * reshape_progress was updated. | |
1011 | */ | |
1012 | smp_rmb(); | |
1013 | if (progress == MaxSector) | |
1014 | return 0; | |
1015 | if (sh->generation == conf->generation - 1) | |
1016 | return 0; | |
1017 | /* We are in a reshape, and this is a new-generation stripe, | |
1018 | * so use new_data_offset. | |
1019 | */ | |
1020 | return 1; | |
1021 | } | |
1022 | ||
aaf9f12e | 1023 | static void dispatch_bio_list(struct bio_list *tmp) |
765d704d | 1024 | { |
765d704d SL |
1025 | struct bio *bio; |
1026 | ||
aaf9f12e | 1027 | while ((bio = bio_list_pop(tmp))) |
ed00aabd | 1028 | submit_bio_noacct(bio); |
aaf9f12e SL |
1029 | } |
1030 | ||
4f0f586b ST |
1031 | static int cmp_stripe(void *priv, const struct list_head *a, |
1032 | const struct list_head *b) | |
aaf9f12e SL |
1033 | { |
1034 | const struct r5pending_data *da = list_entry(a, | |
1035 | struct r5pending_data, sibling); | |
1036 | const struct r5pending_data *db = list_entry(b, | |
1037 | struct r5pending_data, sibling); | |
1038 | if (da->sector > db->sector) | |
1039 | return 1; | |
1040 | if (da->sector < db->sector) | |
1041 | return -1; | |
1042 | return 0; | |
1043 | } | |
1044 | ||
1045 | static void dispatch_defer_bios(struct r5conf *conf, int target, | |
1046 | struct bio_list *list) | |
1047 | { | |
1048 | struct r5pending_data *data; | |
1049 | struct list_head *first, *next = NULL; | |
1050 | int cnt = 0; | |
1051 | ||
1052 | if (conf->pending_data_cnt == 0) | |
1053 | return; | |
1054 | ||
1055 | list_sort(NULL, &conf->pending_list, cmp_stripe); | |
1056 | ||
1057 | first = conf->pending_list.next; | |
1058 | ||
1059 | /* temporarily move the head */ | |
1060 | if (conf->next_pending_data) | |
1061 | list_move_tail(&conf->pending_list, | |
1062 | &conf->next_pending_data->sibling); | |
1063 | ||
1064 | while (!list_empty(&conf->pending_list)) { | |
1065 | data = list_first_entry(&conf->pending_list, | |
1066 | struct r5pending_data, sibling); | |
1067 | if (&data->sibling == first) | |
1068 | first = data->sibling.next; | |
1069 | next = data->sibling.next; | |
1070 | ||
1071 | bio_list_merge(list, &data->bios); | |
1072 | list_move(&data->sibling, &conf->free_list); | |
1073 | cnt++; | |
1074 | if (cnt >= target) | |
1075 | break; | |
1076 | } | |
1077 | conf->pending_data_cnt -= cnt; | |
1078 | BUG_ON(conf->pending_data_cnt < 0 || cnt < target); | |
1079 | ||
1080 | if (next != &conf->pending_list) | |
1081 | conf->next_pending_data = list_entry(next, | |
1082 | struct r5pending_data, sibling); | |
1083 | else | |
1084 | conf->next_pending_data = NULL; | |
1085 | /* list isn't empty */ | |
1086 | if (first != &conf->pending_list) | |
1087 | list_move_tail(&conf->pending_list, first); | |
1088 | } | |
1089 | ||
1090 | static void flush_deferred_bios(struct r5conf *conf) | |
1091 | { | |
1092 | struct bio_list tmp = BIO_EMPTY_LIST; | |
1093 | ||
1094 | if (conf->pending_data_cnt == 0) | |
765d704d SL |
1095 | return; |
1096 | ||
765d704d | 1097 | spin_lock(&conf->pending_bios_lock); |
aaf9f12e SL |
1098 | dispatch_defer_bios(conf, conf->pending_data_cnt, &tmp); |
1099 | BUG_ON(conf->pending_data_cnt != 0); | |
765d704d SL |
1100 | spin_unlock(&conf->pending_bios_lock); |
1101 | ||
aaf9f12e | 1102 | dispatch_bio_list(&tmp); |
765d704d SL |
1103 | } |
1104 | ||
aaf9f12e SL |
1105 | static void defer_issue_bios(struct r5conf *conf, sector_t sector, |
1106 | struct bio_list *bios) | |
765d704d | 1107 | { |
aaf9f12e SL |
1108 | struct bio_list tmp = BIO_EMPTY_LIST; |
1109 | struct r5pending_data *ent; | |
1110 | ||
765d704d | 1111 | spin_lock(&conf->pending_bios_lock); |
aaf9f12e SL |
1112 | ent = list_first_entry(&conf->free_list, struct r5pending_data, |
1113 | sibling); | |
1114 | list_move_tail(&ent->sibling, &conf->pending_list); | |
1115 | ent->sector = sector; | |
1116 | bio_list_init(&ent->bios); | |
1117 | bio_list_merge(&ent->bios, bios); | |
1118 | conf->pending_data_cnt++; | |
1119 | if (conf->pending_data_cnt >= PENDING_IO_MAX) | |
1120 | dispatch_defer_bios(conf, PENDING_IO_ONE_FLUSH, &tmp); | |
1121 | ||
765d704d | 1122 | spin_unlock(&conf->pending_bios_lock); |
aaf9f12e SL |
1123 | |
1124 | dispatch_bio_list(&tmp); | |
765d704d SL |
1125 | } |
1126 | ||
6712ecf8 | 1127 | static void |
4246a0b6 | 1128 | raid5_end_read_request(struct bio *bi); |
6712ecf8 | 1129 | static void |
4246a0b6 | 1130 | raid5_end_write_request(struct bio *bi); |
91c00924 | 1131 | |
c4e5ac0a | 1132 | static void ops_run_io(struct stripe_head *sh, struct stripe_head_state *s) |
91c00924 | 1133 | { |
d1688a6d | 1134 | struct r5conf *conf = sh->raid_conf; |
91c00924 | 1135 | int i, disks = sh->disks; |
59fc630b | 1136 | struct stripe_head *head_sh = sh; |
aaf9f12e | 1137 | struct bio_list pending_bios = BIO_EMPTY_LIST; |
03a6b195 | 1138 | struct r5dev *dev; |
aaf9f12e | 1139 | bool should_defer; |
91c00924 DW |
1140 | |
1141 | might_sleep(); | |
1142 | ||
ff875738 AP |
1143 | if (log_stripe(sh, s) == 0) |
1144 | return; | |
1e6d690b | 1145 | |
aaf9f12e | 1146 | should_defer = conf->batch_bio_dispatch && conf->group_cnt; |
1e6d690b | 1147 | |
91c00924 | 1148 | for (i = disks; i--; ) { |
a9010741 BVA |
1149 | enum req_op op; |
1150 | blk_opf_t op_flags = 0; | |
9a3e1101 | 1151 | int replace_only = 0; |
977df362 N |
1152 | struct bio *bi, *rbi; |
1153 | struct md_rdev *rdev, *rrdev = NULL; | |
59fc630b | 1154 | |
1155 | sh = head_sh; | |
e9c7469b | 1156 | if (test_and_clear_bit(R5_Wantwrite, &sh->dev[i].flags)) { |
796a5cf0 | 1157 | op = REQ_OP_WRITE; |
e9c7469b | 1158 | if (test_and_clear_bit(R5_WantFUA, &sh->dev[i].flags)) |
70fd7614 | 1159 | op_flags = REQ_FUA; |
9e444768 | 1160 | if (test_bit(R5_Discard, &sh->dev[i].flags)) |
796a5cf0 | 1161 | op = REQ_OP_DISCARD; |
e9c7469b | 1162 | } else if (test_and_clear_bit(R5_Wantread, &sh->dev[i].flags)) |
796a5cf0 | 1163 | op = REQ_OP_READ; |
9a3e1101 N |
1164 | else if (test_and_clear_bit(R5_WantReplace, |
1165 | &sh->dev[i].flags)) { | |
796a5cf0 | 1166 | op = REQ_OP_WRITE; |
9a3e1101 N |
1167 | replace_only = 1; |
1168 | } else | |
91c00924 | 1169 | continue; |
bc0934f0 | 1170 | if (test_and_clear_bit(R5_SyncIO, &sh->dev[i].flags)) |
796a5cf0 | 1171 | op_flags |= REQ_SYNC; |
91c00924 | 1172 | |
59fc630b | 1173 | again: |
03a6b195 CH |
1174 | dev = &sh->dev[i]; |
1175 | bi = &dev->req; | |
1176 | rbi = &dev->rreq; /* For writing to replacement */ | |
91c00924 | 1177 | |
91c00924 | 1178 | rcu_read_lock(); |
9a3e1101 | 1179 | rrdev = rcu_dereference(conf->disks[i].replacement); |
dd054fce N |
1180 | smp_mb(); /* Ensure that if rrdev is NULL, rdev won't be */ |
1181 | rdev = rcu_dereference(conf->disks[i].rdev); | |
1182 | if (!rdev) { | |
1183 | rdev = rrdev; | |
1184 | rrdev = NULL; | |
1185 | } | |
796a5cf0 | 1186 | if (op_is_write(op)) { |
9a3e1101 N |
1187 | if (replace_only) |
1188 | rdev = NULL; | |
dd054fce N |
1189 | if (rdev == rrdev) |
1190 | /* We raced and saw duplicates */ | |
1191 | rrdev = NULL; | |
9a3e1101 | 1192 | } else { |
59fc630b | 1193 | if (test_bit(R5_ReadRepl, &head_sh->dev[i].flags) && rrdev) |
9a3e1101 N |
1194 | rdev = rrdev; |
1195 | rrdev = NULL; | |
1196 | } | |
977df362 | 1197 | |
91c00924 DW |
1198 | if (rdev && test_bit(Faulty, &rdev->flags)) |
1199 | rdev = NULL; | |
1200 | if (rdev) | |
1201 | atomic_inc(&rdev->nr_pending); | |
977df362 N |
1202 | if (rrdev && test_bit(Faulty, &rrdev->flags)) |
1203 | rrdev = NULL; | |
1204 | if (rrdev) | |
1205 | atomic_inc(&rrdev->nr_pending); | |
91c00924 DW |
1206 | rcu_read_unlock(); |
1207 | ||
73e92e51 | 1208 | /* We have already checked bad blocks for reads. Now |
977df362 N |
1209 | * need to check for writes. We never accept write errors |
1210 | * on the replacement, so we don't to check rrdev. | |
73e92e51 | 1211 | */ |
796a5cf0 | 1212 | while (op_is_write(op) && rdev && |
73e92e51 N |
1213 | test_bit(WriteErrorSeen, &rdev->flags)) { |
1214 | sector_t first_bad; | |
1215 | int bad_sectors; | |
c911c46c | 1216 | int bad = is_badblock(rdev, sh->sector, RAID5_STRIPE_SECTORS(conf), |
73e92e51 N |
1217 | &first_bad, &bad_sectors); |
1218 | if (!bad) | |
1219 | break; | |
1220 | ||
1221 | if (bad < 0) { | |
1222 | set_bit(BlockedBadBlocks, &rdev->flags); | |
1223 | if (!conf->mddev->external && | |
2953079c | 1224 | conf->mddev->sb_flags) { |
73e92e51 N |
1225 | /* It is very unlikely, but we might |
1226 | * still need to write out the | |
1227 | * bad block log - better give it | |
1228 | * a chance*/ | |
1229 | md_check_recovery(conf->mddev); | |
1230 | } | |
1850753d | 1231 | /* |
1232 | * Because md_wait_for_blocked_rdev | |
1233 | * will dec nr_pending, we must | |
1234 | * increment it first. | |
1235 | */ | |
1236 | atomic_inc(&rdev->nr_pending); | |
73e92e51 N |
1237 | md_wait_for_blocked_rdev(rdev, conf->mddev); |
1238 | } else { | |
1239 | /* Acknowledged bad block - skip the write */ | |
1240 | rdev_dec_pending(rdev, conf->mddev); | |
1241 | rdev = NULL; | |
1242 | } | |
1243 | } | |
1244 | ||
91c00924 | 1245 | if (rdev) { |
9a3e1101 N |
1246 | if (s->syncing || s->expanding || s->expanded |
1247 | || s->replacing) | |
c911c46c | 1248 | md_sync_acct(rdev->bdev, RAID5_STRIPE_SECTORS(conf)); |
91c00924 | 1249 | |
2b7497f0 DW |
1250 | set_bit(STRIPE_IO_STARTED, &sh->state); |
1251 | ||
03a6b195 | 1252 | bio_init(bi, rdev->bdev, &dev->vec, 1, op | op_flags); |
796a5cf0 | 1253 | bi->bi_end_io = op_is_write(op) |
2f6db2a7 KO |
1254 | ? raid5_end_write_request |
1255 | : raid5_end_read_request; | |
1256 | bi->bi_private = sh; | |
1257 | ||
6296b960 | 1258 | pr_debug("%s: for %llu schedule op %d on disc %d\n", |
e46b272b | 1259 | __func__, (unsigned long long)sh->sector, |
1eff9d32 | 1260 | bi->bi_opf, i); |
91c00924 | 1261 | atomic_inc(&sh->count); |
59fc630b | 1262 | if (sh != head_sh) |
1263 | atomic_inc(&head_sh->count); | |
05616be5 | 1264 | if (use_new_offset(conf, sh)) |
4f024f37 | 1265 | bi->bi_iter.bi_sector = (sh->sector |
05616be5 N |
1266 | + rdev->new_data_offset); |
1267 | else | |
4f024f37 | 1268 | bi->bi_iter.bi_sector = (sh->sector |
05616be5 | 1269 | + rdev->data_offset); |
59fc630b | 1270 | if (test_bit(R5_ReadNoMerge, &head_sh->dev[i].flags)) |
1eff9d32 | 1271 | bi->bi_opf |= REQ_NOMERGE; |
3f9e7c14 | 1272 | |
d592a996 SL |
1273 | if (test_bit(R5_SkipCopy, &sh->dev[i].flags)) |
1274 | WARN_ON(test_bit(R5_UPTODATE, &sh->dev[i].flags)); | |
86aa1397 SL |
1275 | |
1276 | if (!op_is_write(op) && | |
1277 | test_bit(R5_InJournal, &sh->dev[i].flags)) | |
1278 | /* | |
1279 | * issuing read for a page in journal, this | |
1280 | * must be preparing for prexor in rmw; read | |
1281 | * the data into orig_page | |
1282 | */ | |
1283 | sh->dev[i].vec.bv_page = sh->dev[i].orig_page; | |
1284 | else | |
1285 | sh->dev[i].vec.bv_page = sh->dev[i].page; | |
4997b72e | 1286 | bi->bi_vcnt = 1; |
c911c46c | 1287 | bi->bi_io_vec[0].bv_len = RAID5_STRIPE_SIZE(conf); |
7aba13b7 | 1288 | bi->bi_io_vec[0].bv_offset = sh->dev[i].offset; |
c911c46c | 1289 | bi->bi_iter.bi_size = RAID5_STRIPE_SIZE(conf); |
37c61ff3 SL |
1290 | /* |
1291 | * If this is discard request, set bi_vcnt 0. We don't | |
1292 | * want to confuse SCSI because SCSI will replace payload | |
1293 | */ | |
796a5cf0 | 1294 | if (op == REQ_OP_DISCARD) |
37c61ff3 | 1295 | bi->bi_vcnt = 0; |
977df362 N |
1296 | if (rrdev) |
1297 | set_bit(R5_DOUBLE_LOCKED, &sh->dev[i].flags); | |
e3620a3a JB |
1298 | |
1299 | if (conf->mddev->gendisk) | |
1c02fca6 CH |
1300 | trace_block_bio_remap(bi, |
1301 | disk_devt(conf->mddev->gendisk), | |
1302 | sh->dev[i].sector); | |
aaf9f12e SL |
1303 | if (should_defer && op_is_write(op)) |
1304 | bio_list_add(&pending_bios, bi); | |
1305 | else | |
ed00aabd | 1306 | submit_bio_noacct(bi); |
977df362 N |
1307 | } |
1308 | if (rrdev) { | |
9a3e1101 N |
1309 | if (s->syncing || s->expanding || s->expanded |
1310 | || s->replacing) | |
c911c46c | 1311 | md_sync_acct(rrdev->bdev, RAID5_STRIPE_SECTORS(conf)); |
977df362 N |
1312 | |
1313 | set_bit(STRIPE_IO_STARTED, &sh->state); | |
1314 | ||
03a6b195 | 1315 | bio_init(rbi, rrdev->bdev, &dev->rvec, 1, op | op_flags); |
796a5cf0 | 1316 | BUG_ON(!op_is_write(op)); |
2f6db2a7 KO |
1317 | rbi->bi_end_io = raid5_end_write_request; |
1318 | rbi->bi_private = sh; | |
1319 | ||
6296b960 | 1320 | pr_debug("%s: for %llu schedule op %d on " |
977df362 N |
1321 | "replacement disc %d\n", |
1322 | __func__, (unsigned long long)sh->sector, | |
1eff9d32 | 1323 | rbi->bi_opf, i); |
977df362 | 1324 | atomic_inc(&sh->count); |
59fc630b | 1325 | if (sh != head_sh) |
1326 | atomic_inc(&head_sh->count); | |
05616be5 | 1327 | if (use_new_offset(conf, sh)) |
4f024f37 | 1328 | rbi->bi_iter.bi_sector = (sh->sector |
05616be5 N |
1329 | + rrdev->new_data_offset); |
1330 | else | |
4f024f37 | 1331 | rbi->bi_iter.bi_sector = (sh->sector |
05616be5 | 1332 | + rrdev->data_offset); |
d592a996 SL |
1333 | if (test_bit(R5_SkipCopy, &sh->dev[i].flags)) |
1334 | WARN_ON(test_bit(R5_UPTODATE, &sh->dev[i].flags)); | |
1335 | sh->dev[i].rvec.bv_page = sh->dev[i].page; | |
4997b72e | 1336 | rbi->bi_vcnt = 1; |
c911c46c | 1337 | rbi->bi_io_vec[0].bv_len = RAID5_STRIPE_SIZE(conf); |
7aba13b7 | 1338 | rbi->bi_io_vec[0].bv_offset = sh->dev[i].offset; |
c911c46c | 1339 | rbi->bi_iter.bi_size = RAID5_STRIPE_SIZE(conf); |
37c61ff3 SL |
1340 | /* |
1341 | * If this is discard request, set bi_vcnt 0. We don't | |
1342 | * want to confuse SCSI because SCSI will replace payload | |
1343 | */ | |
796a5cf0 | 1344 | if (op == REQ_OP_DISCARD) |
37c61ff3 | 1345 | rbi->bi_vcnt = 0; |
e3620a3a | 1346 | if (conf->mddev->gendisk) |
1c02fca6 CH |
1347 | trace_block_bio_remap(rbi, |
1348 | disk_devt(conf->mddev->gendisk), | |
1349 | sh->dev[i].sector); | |
aaf9f12e SL |
1350 | if (should_defer && op_is_write(op)) |
1351 | bio_list_add(&pending_bios, rbi); | |
1352 | else | |
ed00aabd | 1353 | submit_bio_noacct(rbi); |
977df362 N |
1354 | } |
1355 | if (!rdev && !rrdev) { | |
796a5cf0 | 1356 | if (op_is_write(op)) |
91c00924 | 1357 | set_bit(STRIPE_DEGRADED, &sh->state); |
6296b960 | 1358 | pr_debug("skip op %d on disc %d for sector %llu\n", |
1eff9d32 | 1359 | bi->bi_opf, i, (unsigned long long)sh->sector); |
91c00924 DW |
1360 | clear_bit(R5_LOCKED, &sh->dev[i].flags); |
1361 | set_bit(STRIPE_HANDLE, &sh->state); | |
1362 | } | |
59fc630b | 1363 | |
1364 | if (!head_sh->batch_head) | |
1365 | continue; | |
1366 | sh = list_first_entry(&sh->batch_list, struct stripe_head, | |
1367 | batch_list); | |
1368 | if (sh != head_sh) | |
1369 | goto again; | |
91c00924 | 1370 | } |
aaf9f12e SL |
1371 | |
1372 | if (should_defer && !bio_list_empty(&pending_bios)) | |
1373 | defer_issue_bios(conf, head_sh->sector, &pending_bios); | |
91c00924 DW |
1374 | } |
1375 | ||
1376 | static struct dma_async_tx_descriptor * | |
d592a996 | 1377 | async_copy_data(int frombio, struct bio *bio, struct page **page, |
248728dd | 1378 | unsigned int poff, sector_t sector, struct dma_async_tx_descriptor *tx, |
1e6d690b | 1379 | struct stripe_head *sh, int no_skipcopy) |
91c00924 | 1380 | { |
7988613b KO |
1381 | struct bio_vec bvl; |
1382 | struct bvec_iter iter; | |
91c00924 | 1383 | struct page *bio_page; |
91c00924 | 1384 | int page_offset; |
a08abd8c | 1385 | struct async_submit_ctl submit; |
0403e382 | 1386 | enum async_tx_flags flags = 0; |
c911c46c | 1387 | struct r5conf *conf = sh->raid_conf; |
91c00924 | 1388 | |
4f024f37 KO |
1389 | if (bio->bi_iter.bi_sector >= sector) |
1390 | page_offset = (signed)(bio->bi_iter.bi_sector - sector) * 512; | |
91c00924 | 1391 | else |
4f024f37 | 1392 | page_offset = (signed)(sector - bio->bi_iter.bi_sector) * -512; |
a08abd8c | 1393 | |
0403e382 DW |
1394 | if (frombio) |
1395 | flags |= ASYNC_TX_FENCE; | |
1396 | init_async_submit(&submit, flags, tx, NULL, NULL, NULL); | |
1397 | ||
7988613b KO |
1398 | bio_for_each_segment(bvl, bio, iter) { |
1399 | int len = bvl.bv_len; | |
91c00924 DW |
1400 | int clen; |
1401 | int b_offset = 0; | |
1402 | ||
1403 | if (page_offset < 0) { | |
1404 | b_offset = -page_offset; | |
1405 | page_offset += b_offset; | |
1406 | len -= b_offset; | |
1407 | } | |
1408 | ||
c911c46c YY |
1409 | if (len > 0 && page_offset + len > RAID5_STRIPE_SIZE(conf)) |
1410 | clen = RAID5_STRIPE_SIZE(conf) - page_offset; | |
91c00924 DW |
1411 | else |
1412 | clen = len; | |
1413 | ||
1414 | if (clen > 0) { | |
7988613b KO |
1415 | b_offset += bvl.bv_offset; |
1416 | bio_page = bvl.bv_page; | |
d592a996 | 1417 | if (frombio) { |
c911c46c | 1418 | if (conf->skip_copy && |
d592a996 | 1419 | b_offset == 0 && page_offset == 0 && |
c911c46c | 1420 | clen == RAID5_STRIPE_SIZE(conf) && |
1e6d690b | 1421 | !no_skipcopy) |
d592a996 SL |
1422 | *page = bio_page; |
1423 | else | |
248728dd | 1424 | tx = async_memcpy(*page, bio_page, page_offset + poff, |
a08abd8c | 1425 | b_offset, clen, &submit); |
d592a996 SL |
1426 | } else |
1427 | tx = async_memcpy(bio_page, *page, b_offset, | |
248728dd | 1428 | page_offset + poff, clen, &submit); |
91c00924 | 1429 | } |
a08abd8c DW |
1430 | /* chain the operations */ |
1431 | submit.depend_tx = tx; | |
1432 | ||
91c00924 DW |
1433 | if (clen < len) /* hit end of page */ |
1434 | break; | |
1435 | page_offset += len; | |
1436 | } | |
1437 | ||
1438 | return tx; | |
1439 | } | |
1440 | ||
1441 | static void ops_complete_biofill(void *stripe_head_ref) | |
1442 | { | |
1443 | struct stripe_head *sh = stripe_head_ref; | |
e4d84909 | 1444 | int i; |
c911c46c | 1445 | struct r5conf *conf = sh->raid_conf; |
91c00924 | 1446 | |
e46b272b | 1447 | pr_debug("%s: stripe %llu\n", __func__, |
91c00924 DW |
1448 | (unsigned long long)sh->sector); |
1449 | ||
1450 | /* clear completed biofills */ | |
1451 | for (i = sh->disks; i--; ) { | |
1452 | struct r5dev *dev = &sh->dev[i]; | |
91c00924 DW |
1453 | |
1454 | /* acknowledge completion of a biofill operation */ | |
e4d84909 DW |
1455 | /* and check if we need to reply to a read request, |
1456 | * new R5_Wantfill requests are held off until | |
83de75cc | 1457 | * !STRIPE_BIOFILL_RUN |
e4d84909 DW |
1458 | */ |
1459 | if (test_and_clear_bit(R5_Wantfill, &dev->flags)) { | |
91c00924 | 1460 | struct bio *rbi, *rbi2; |
91c00924 | 1461 | |
91c00924 DW |
1462 | BUG_ON(!dev->read); |
1463 | rbi = dev->read; | |
1464 | dev->read = NULL; | |
4f024f37 | 1465 | while (rbi && rbi->bi_iter.bi_sector < |
c911c46c YY |
1466 | dev->sector + RAID5_STRIPE_SECTORS(conf)) { |
1467 | rbi2 = r5_next_bio(conf, rbi, dev->sector); | |
016c76ac | 1468 | bio_endio(rbi); |
91c00924 DW |
1469 | rbi = rbi2; |
1470 | } | |
1471 | } | |
1472 | } | |
83de75cc | 1473 | clear_bit(STRIPE_BIOFILL_RUN, &sh->state); |
91c00924 | 1474 | |
e4d84909 | 1475 | set_bit(STRIPE_HANDLE, &sh->state); |
6d036f7d | 1476 | raid5_release_stripe(sh); |
91c00924 DW |
1477 | } |
1478 | ||
1479 | static void ops_run_biofill(struct stripe_head *sh) | |
1480 | { | |
1481 | struct dma_async_tx_descriptor *tx = NULL; | |
a08abd8c | 1482 | struct async_submit_ctl submit; |
91c00924 | 1483 | int i; |
c911c46c | 1484 | struct r5conf *conf = sh->raid_conf; |
91c00924 | 1485 | |
59fc630b | 1486 | BUG_ON(sh->batch_head); |
e46b272b | 1487 | pr_debug("%s: stripe %llu\n", __func__, |
91c00924 DW |
1488 | (unsigned long long)sh->sector); |
1489 | ||
1490 | for (i = sh->disks; i--; ) { | |
1491 | struct r5dev *dev = &sh->dev[i]; | |
1492 | if (test_bit(R5_Wantfill, &dev->flags)) { | |
1493 | struct bio *rbi; | |
b17459c0 | 1494 | spin_lock_irq(&sh->stripe_lock); |
91c00924 DW |
1495 | dev->read = rbi = dev->toread; |
1496 | dev->toread = NULL; | |
b17459c0 | 1497 | spin_unlock_irq(&sh->stripe_lock); |
4f024f37 | 1498 | while (rbi && rbi->bi_iter.bi_sector < |
c911c46c | 1499 | dev->sector + RAID5_STRIPE_SECTORS(conf)) { |
d592a996 | 1500 | tx = async_copy_data(0, rbi, &dev->page, |
248728dd | 1501 | dev->offset, |
1e6d690b | 1502 | dev->sector, tx, sh, 0); |
c911c46c | 1503 | rbi = r5_next_bio(conf, rbi, dev->sector); |
91c00924 DW |
1504 | } |
1505 | } | |
1506 | } | |
1507 | ||
1508 | atomic_inc(&sh->count); | |
a08abd8c DW |
1509 | init_async_submit(&submit, ASYNC_TX_ACK, tx, ops_complete_biofill, sh, NULL); |
1510 | async_trigger_callback(&submit); | |
91c00924 DW |
1511 | } |
1512 | ||
4e7d2c0a | 1513 | static void mark_target_uptodate(struct stripe_head *sh, int target) |
91c00924 | 1514 | { |
4e7d2c0a | 1515 | struct r5dev *tgt; |
91c00924 | 1516 | |
4e7d2c0a DW |
1517 | if (target < 0) |
1518 | return; | |
91c00924 | 1519 | |
4e7d2c0a | 1520 | tgt = &sh->dev[target]; |
91c00924 DW |
1521 | set_bit(R5_UPTODATE, &tgt->flags); |
1522 | BUG_ON(!test_bit(R5_Wantcompute, &tgt->flags)); | |
1523 | clear_bit(R5_Wantcompute, &tgt->flags); | |
4e7d2c0a DW |
1524 | } |
1525 | ||
ac6b53b6 | 1526 | static void ops_complete_compute(void *stripe_head_ref) |
91c00924 DW |
1527 | { |
1528 | struct stripe_head *sh = stripe_head_ref; | |
91c00924 | 1529 | |
e46b272b | 1530 | pr_debug("%s: stripe %llu\n", __func__, |
91c00924 DW |
1531 | (unsigned long long)sh->sector); |
1532 | ||
ac6b53b6 | 1533 | /* mark the computed target(s) as uptodate */ |
4e7d2c0a | 1534 | mark_target_uptodate(sh, sh->ops.target); |
ac6b53b6 | 1535 | mark_target_uptodate(sh, sh->ops.target2); |
4e7d2c0a | 1536 | |
ecc65c9b DW |
1537 | clear_bit(STRIPE_COMPUTE_RUN, &sh->state); |
1538 | if (sh->check_state == check_state_compute_run) | |
1539 | sh->check_state = check_state_compute_result; | |
91c00924 | 1540 | set_bit(STRIPE_HANDLE, &sh->state); |
6d036f7d | 1541 | raid5_release_stripe(sh); |
91c00924 DW |
1542 | } |
1543 | ||
d6f38f31 | 1544 | /* return a pointer to the address conversion region of the scribble buffer */ |
b330e6a4 | 1545 | static struct page **to_addr_page(struct raid5_percpu *percpu, int i) |
d6f38f31 | 1546 | { |
b330e6a4 | 1547 | return percpu->scribble + i * percpu->scribble_obj_size; |
46d5b785 | 1548 | } |
1549 | ||
1550 | /* return a pointer to the address conversion region of the scribble buffer */ | |
b330e6a4 KO |
1551 | static addr_conv_t *to_addr_conv(struct stripe_head *sh, |
1552 | struct raid5_percpu *percpu, int i) | |
46d5b785 | 1553 | { |
b330e6a4 | 1554 | return (void *) (to_addr_page(percpu, i) + sh->disks + 2); |
d6f38f31 DW |
1555 | } |
1556 | ||
7aba13b7 YY |
1557 | /* |
1558 | * Return a pointer to record offset address. | |
1559 | */ | |
1560 | static unsigned int * | |
1561 | to_addr_offs(struct stripe_head *sh, struct raid5_percpu *percpu) | |
1562 | { | |
1563 | return (unsigned int *) (to_addr_conv(sh, percpu, 0) + sh->disks + 2); | |
1564 | } | |
1565 | ||
d6f38f31 DW |
1566 | static struct dma_async_tx_descriptor * |
1567 | ops_run_compute5(struct stripe_head *sh, struct raid5_percpu *percpu) | |
91c00924 | 1568 | { |
91c00924 | 1569 | int disks = sh->disks; |
46d5b785 | 1570 | struct page **xor_srcs = to_addr_page(percpu, 0); |
7aba13b7 | 1571 | unsigned int *off_srcs = to_addr_offs(sh, percpu); |
91c00924 DW |
1572 | int target = sh->ops.target; |
1573 | struct r5dev *tgt = &sh->dev[target]; | |
1574 | struct page *xor_dest = tgt->page; | |
7aba13b7 | 1575 | unsigned int off_dest = tgt->offset; |
91c00924 DW |
1576 | int count = 0; |
1577 | struct dma_async_tx_descriptor *tx; | |
a08abd8c | 1578 | struct async_submit_ctl submit; |
91c00924 DW |
1579 | int i; |
1580 | ||
59fc630b | 1581 | BUG_ON(sh->batch_head); |
1582 | ||
91c00924 | 1583 | pr_debug("%s: stripe %llu block: %d\n", |
e46b272b | 1584 | __func__, (unsigned long long)sh->sector, target); |
91c00924 DW |
1585 | BUG_ON(!test_bit(R5_Wantcompute, &tgt->flags)); |
1586 | ||
7aba13b7 YY |
1587 | for (i = disks; i--; ) { |
1588 | if (i != target) { | |
1589 | off_srcs[count] = sh->dev[i].offset; | |
91c00924 | 1590 | xor_srcs[count++] = sh->dev[i].page; |
7aba13b7 YY |
1591 | } |
1592 | } | |
91c00924 DW |
1593 | |
1594 | atomic_inc(&sh->count); | |
1595 | ||
0403e382 | 1596 | init_async_submit(&submit, ASYNC_TX_FENCE|ASYNC_TX_XOR_ZERO_DST, NULL, |
46d5b785 | 1597 | ops_complete_compute, sh, to_addr_conv(sh, percpu, 0)); |
91c00924 | 1598 | if (unlikely(count == 1)) |
7aba13b7 | 1599 | tx = async_memcpy(xor_dest, xor_srcs[0], off_dest, off_srcs[0], |
c911c46c | 1600 | RAID5_STRIPE_SIZE(sh->raid_conf), &submit); |
91c00924 | 1601 | else |
a7c224a8 | 1602 | tx = async_xor_offs(xor_dest, off_dest, xor_srcs, off_srcs, count, |
c911c46c | 1603 | RAID5_STRIPE_SIZE(sh->raid_conf), &submit); |
91c00924 | 1604 | |
91c00924 DW |
1605 | return tx; |
1606 | } | |
1607 | ||
ac6b53b6 DW |
1608 | /* set_syndrome_sources - populate source buffers for gen_syndrome |
1609 | * @srcs - (struct page *) array of size sh->disks | |
d69454bc | 1610 | * @offs - (unsigned int) array of offset for each page |
ac6b53b6 DW |
1611 | * @sh - stripe_head to parse |
1612 | * | |
1613 | * Populates srcs in proper layout order for the stripe and returns the | |
1614 | * 'count' of sources to be used in a call to async_gen_syndrome. The P | |
1615 | * destination buffer is recorded in srcs[count] and the Q destination | |
1616 | * is recorded in srcs[count+1]]. | |
1617 | */ | |
584acdd4 | 1618 | static int set_syndrome_sources(struct page **srcs, |
d69454bc | 1619 | unsigned int *offs, |
584acdd4 MS |
1620 | struct stripe_head *sh, |
1621 | int srctype) | |
ac6b53b6 DW |
1622 | { |
1623 | int disks = sh->disks; | |
1624 | int syndrome_disks = sh->ddf_layout ? disks : (disks - 2); | |
1625 | int d0_idx = raid6_d0(sh); | |
1626 | int count; | |
1627 | int i; | |
1628 | ||
1629 | for (i = 0; i < disks; i++) | |
5dd33c9a | 1630 | srcs[i] = NULL; |
ac6b53b6 DW |
1631 | |
1632 | count = 0; | |
1633 | i = d0_idx; | |
1634 | do { | |
1635 | int slot = raid6_idx_to_slot(i, sh, &count, syndrome_disks); | |
584acdd4 | 1636 | struct r5dev *dev = &sh->dev[i]; |
ac6b53b6 | 1637 | |
584acdd4 MS |
1638 | if (i == sh->qd_idx || i == sh->pd_idx || |
1639 | (srctype == SYNDROME_SRC_ALL) || | |
1640 | (srctype == SYNDROME_SRC_WANT_DRAIN && | |
1e6d690b SL |
1641 | (test_bit(R5_Wantdrain, &dev->flags) || |
1642 | test_bit(R5_InJournal, &dev->flags))) || | |
584acdd4 | 1643 | (srctype == SYNDROME_SRC_WRITTEN && |
0977762f SL |
1644 | (dev->written || |
1645 | test_bit(R5_InJournal, &dev->flags)))) { | |
1e6d690b SL |
1646 | if (test_bit(R5_InJournal, &dev->flags)) |
1647 | srcs[slot] = sh->dev[i].orig_page; | |
1648 | else | |
1649 | srcs[slot] = sh->dev[i].page; | |
d69454bc YY |
1650 | /* |
1651 | * For R5_InJournal, PAGE_SIZE must be 4KB and will | |
1652 | * not shared page. In that case, dev[i].offset | |
1653 | * is 0. | |
1654 | */ | |
1655 | offs[slot] = sh->dev[i].offset; | |
1e6d690b | 1656 | } |
ac6b53b6 DW |
1657 | i = raid6_next_disk(i, disks); |
1658 | } while (i != d0_idx); | |
ac6b53b6 | 1659 | |
e4424fee | 1660 | return syndrome_disks; |
ac6b53b6 DW |
1661 | } |
1662 | ||
1663 | static struct dma_async_tx_descriptor * | |
1664 | ops_run_compute6_1(struct stripe_head *sh, struct raid5_percpu *percpu) | |
1665 | { | |
1666 | int disks = sh->disks; | |
46d5b785 | 1667 | struct page **blocks = to_addr_page(percpu, 0); |
a7c224a8 | 1668 | unsigned int *offs = to_addr_offs(sh, percpu); |
ac6b53b6 DW |
1669 | int target; |
1670 | int qd_idx = sh->qd_idx; | |
1671 | struct dma_async_tx_descriptor *tx; | |
1672 | struct async_submit_ctl submit; | |
1673 | struct r5dev *tgt; | |
1674 | struct page *dest; | |
a7c224a8 | 1675 | unsigned int dest_off; |
ac6b53b6 DW |
1676 | int i; |
1677 | int count; | |
1678 | ||
59fc630b | 1679 | BUG_ON(sh->batch_head); |
ac6b53b6 DW |
1680 | if (sh->ops.target < 0) |
1681 | target = sh->ops.target2; | |
1682 | else if (sh->ops.target2 < 0) | |
1683 | target = sh->ops.target; | |
91c00924 | 1684 | else |
ac6b53b6 DW |
1685 | /* we should only have one valid target */ |
1686 | BUG(); | |
1687 | BUG_ON(target < 0); | |
1688 | pr_debug("%s: stripe %llu block: %d\n", | |
1689 | __func__, (unsigned long long)sh->sector, target); | |
1690 | ||
1691 | tgt = &sh->dev[target]; | |
1692 | BUG_ON(!test_bit(R5_Wantcompute, &tgt->flags)); | |
1693 | dest = tgt->page; | |
a7c224a8 | 1694 | dest_off = tgt->offset; |
ac6b53b6 DW |
1695 | |
1696 | atomic_inc(&sh->count); | |
1697 | ||
1698 | if (target == qd_idx) { | |
d69454bc | 1699 | count = set_syndrome_sources(blocks, offs, sh, SYNDROME_SRC_ALL); |
ac6b53b6 DW |
1700 | blocks[count] = NULL; /* regenerating p is not necessary */ |
1701 | BUG_ON(blocks[count+1] != dest); /* q should already be set */ | |
0403e382 DW |
1702 | init_async_submit(&submit, ASYNC_TX_FENCE, NULL, |
1703 | ops_complete_compute, sh, | |
46d5b785 | 1704 | to_addr_conv(sh, percpu, 0)); |
d69454bc | 1705 | tx = async_gen_syndrome(blocks, offs, count+2, |
c911c46c | 1706 | RAID5_STRIPE_SIZE(sh->raid_conf), &submit); |
ac6b53b6 DW |
1707 | } else { |
1708 | /* Compute any data- or p-drive using XOR */ | |
1709 | count = 0; | |
1710 | for (i = disks; i-- ; ) { | |
1711 | if (i == target || i == qd_idx) | |
1712 | continue; | |
a7c224a8 | 1713 | offs[count] = sh->dev[i].offset; |
ac6b53b6 DW |
1714 | blocks[count++] = sh->dev[i].page; |
1715 | } | |
1716 | ||
0403e382 DW |
1717 | init_async_submit(&submit, ASYNC_TX_FENCE|ASYNC_TX_XOR_ZERO_DST, |
1718 | NULL, ops_complete_compute, sh, | |
46d5b785 | 1719 | to_addr_conv(sh, percpu, 0)); |
a7c224a8 | 1720 | tx = async_xor_offs(dest, dest_off, blocks, offs, count, |
c911c46c | 1721 | RAID5_STRIPE_SIZE(sh->raid_conf), &submit); |
ac6b53b6 | 1722 | } |
91c00924 | 1723 | |
91c00924 DW |
1724 | return tx; |
1725 | } | |
1726 | ||
ac6b53b6 DW |
1727 | static struct dma_async_tx_descriptor * |
1728 | ops_run_compute6_2(struct stripe_head *sh, struct raid5_percpu *percpu) | |
1729 | { | |
1730 | int i, count, disks = sh->disks; | |
1731 | int syndrome_disks = sh->ddf_layout ? disks : disks-2; | |
1732 | int d0_idx = raid6_d0(sh); | |
1733 | int faila = -1, failb = -1; | |
1734 | int target = sh->ops.target; | |
1735 | int target2 = sh->ops.target2; | |
1736 | struct r5dev *tgt = &sh->dev[target]; | |
1737 | struct r5dev *tgt2 = &sh->dev[target2]; | |
1738 | struct dma_async_tx_descriptor *tx; | |
46d5b785 | 1739 | struct page **blocks = to_addr_page(percpu, 0); |
a7c224a8 | 1740 | unsigned int *offs = to_addr_offs(sh, percpu); |
ac6b53b6 DW |
1741 | struct async_submit_ctl submit; |
1742 | ||
59fc630b | 1743 | BUG_ON(sh->batch_head); |
ac6b53b6 DW |
1744 | pr_debug("%s: stripe %llu block1: %d block2: %d\n", |
1745 | __func__, (unsigned long long)sh->sector, target, target2); | |
1746 | BUG_ON(target < 0 || target2 < 0); | |
1747 | BUG_ON(!test_bit(R5_Wantcompute, &tgt->flags)); | |
1748 | BUG_ON(!test_bit(R5_Wantcompute, &tgt2->flags)); | |
1749 | ||
6c910a78 | 1750 | /* we need to open-code set_syndrome_sources to handle the |
ac6b53b6 DW |
1751 | * slot number conversion for 'faila' and 'failb' |
1752 | */ | |
a7c224a8 YY |
1753 | for (i = 0; i < disks ; i++) { |
1754 | offs[i] = 0; | |
5dd33c9a | 1755 | blocks[i] = NULL; |
a7c224a8 | 1756 | } |
ac6b53b6 DW |
1757 | count = 0; |
1758 | i = d0_idx; | |
1759 | do { | |
1760 | int slot = raid6_idx_to_slot(i, sh, &count, syndrome_disks); | |
1761 | ||
a7c224a8 | 1762 | offs[slot] = sh->dev[i].offset; |
ac6b53b6 DW |
1763 | blocks[slot] = sh->dev[i].page; |
1764 | ||
1765 | if (i == target) | |
1766 | faila = slot; | |
1767 | if (i == target2) | |
1768 | failb = slot; | |
1769 | i = raid6_next_disk(i, disks); | |
1770 | } while (i != d0_idx); | |
ac6b53b6 DW |
1771 | |
1772 | BUG_ON(faila == failb); | |
1773 | if (failb < faila) | |
1774 | swap(faila, failb); | |
1775 | pr_debug("%s: stripe: %llu faila: %d failb: %d\n", | |
1776 | __func__, (unsigned long long)sh->sector, faila, failb); | |
1777 | ||
1778 | atomic_inc(&sh->count); | |
1779 | ||
1780 | if (failb == syndrome_disks+1) { | |
1781 | /* Q disk is one of the missing disks */ | |
1782 | if (faila == syndrome_disks) { | |
1783 | /* Missing P+Q, just recompute */ | |
0403e382 DW |
1784 | init_async_submit(&submit, ASYNC_TX_FENCE, NULL, |
1785 | ops_complete_compute, sh, | |
46d5b785 | 1786 | to_addr_conv(sh, percpu, 0)); |
d69454bc | 1787 | return async_gen_syndrome(blocks, offs, syndrome_disks+2, |
c911c46c YY |
1788 | RAID5_STRIPE_SIZE(sh->raid_conf), |
1789 | &submit); | |
ac6b53b6 DW |
1790 | } else { |
1791 | struct page *dest; | |
a7c224a8 | 1792 | unsigned int dest_off; |
ac6b53b6 DW |
1793 | int data_target; |
1794 | int qd_idx = sh->qd_idx; | |
1795 | ||
1796 | /* Missing D+Q: recompute D from P, then recompute Q */ | |
1797 | if (target == qd_idx) | |
1798 | data_target = target2; | |
1799 | else | |
1800 | data_target = target; | |
1801 | ||
1802 | count = 0; | |
1803 | for (i = disks; i-- ; ) { | |
1804 | if (i == data_target || i == qd_idx) | |
1805 | continue; | |
a7c224a8 | 1806 | offs[count] = sh->dev[i].offset; |
ac6b53b6 DW |
1807 | blocks[count++] = sh->dev[i].page; |
1808 | } | |
1809 | dest = sh->dev[data_target].page; | |
a7c224a8 | 1810 | dest_off = sh->dev[data_target].offset; |
0403e382 DW |
1811 | init_async_submit(&submit, |
1812 | ASYNC_TX_FENCE|ASYNC_TX_XOR_ZERO_DST, | |
1813 | NULL, NULL, NULL, | |
46d5b785 | 1814 | to_addr_conv(sh, percpu, 0)); |
a7c224a8 | 1815 | tx = async_xor_offs(dest, dest_off, blocks, offs, count, |
c911c46c | 1816 | RAID5_STRIPE_SIZE(sh->raid_conf), |
ac6b53b6 DW |
1817 | &submit); |
1818 | ||
d69454bc | 1819 | count = set_syndrome_sources(blocks, offs, sh, SYNDROME_SRC_ALL); |
0403e382 DW |
1820 | init_async_submit(&submit, ASYNC_TX_FENCE, tx, |
1821 | ops_complete_compute, sh, | |
46d5b785 | 1822 | to_addr_conv(sh, percpu, 0)); |
d69454bc | 1823 | return async_gen_syndrome(blocks, offs, count+2, |
c911c46c YY |
1824 | RAID5_STRIPE_SIZE(sh->raid_conf), |
1825 | &submit); | |
ac6b53b6 | 1826 | } |
ac6b53b6 | 1827 | } else { |
6c910a78 DW |
1828 | init_async_submit(&submit, ASYNC_TX_FENCE, NULL, |
1829 | ops_complete_compute, sh, | |
46d5b785 | 1830 | to_addr_conv(sh, percpu, 0)); |
6c910a78 DW |
1831 | if (failb == syndrome_disks) { |
1832 | /* We're missing D+P. */ | |
1833 | return async_raid6_datap_recov(syndrome_disks+2, | |
c911c46c YY |
1834 | RAID5_STRIPE_SIZE(sh->raid_conf), |
1835 | faila, | |
4f86ff55 | 1836 | blocks, offs, &submit); |
6c910a78 DW |
1837 | } else { |
1838 | /* We're missing D+D. */ | |
1839 | return async_raid6_2data_recov(syndrome_disks+2, | |
c911c46c YY |
1840 | RAID5_STRIPE_SIZE(sh->raid_conf), |
1841 | faila, failb, | |
4f86ff55 | 1842 | blocks, offs, &submit); |
6c910a78 | 1843 | } |
ac6b53b6 DW |
1844 | } |
1845 | } | |
1846 | ||
91c00924 DW |
1847 | static void ops_complete_prexor(void *stripe_head_ref) |
1848 | { | |
1849 | struct stripe_head *sh = stripe_head_ref; | |
1850 | ||
e46b272b | 1851 | pr_debug("%s: stripe %llu\n", __func__, |
91c00924 | 1852 | (unsigned long long)sh->sector); |
1e6d690b SL |
1853 | |
1854 | if (r5c_is_writeback(sh->raid_conf->log)) | |
1855 | /* | |
1856 | * raid5-cache write back uses orig_page during prexor. | |
1857 | * After prexor, it is time to free orig_page | |
1858 | */ | |
1859 | r5c_release_extra_page(sh); | |
91c00924 DW |
1860 | } |
1861 | ||
1862 | static struct dma_async_tx_descriptor * | |
584acdd4 MS |
1863 | ops_run_prexor5(struct stripe_head *sh, struct raid5_percpu *percpu, |
1864 | struct dma_async_tx_descriptor *tx) | |
91c00924 | 1865 | { |
91c00924 | 1866 | int disks = sh->disks; |
46d5b785 | 1867 | struct page **xor_srcs = to_addr_page(percpu, 0); |
a7c224a8 | 1868 | unsigned int *off_srcs = to_addr_offs(sh, percpu); |
91c00924 | 1869 | int count = 0, pd_idx = sh->pd_idx, i; |
a08abd8c | 1870 | struct async_submit_ctl submit; |
91c00924 DW |
1871 | |
1872 | /* existing parity data subtracted */ | |
a7c224a8 | 1873 | unsigned int off_dest = off_srcs[count] = sh->dev[pd_idx].offset; |
91c00924 DW |
1874 | struct page *xor_dest = xor_srcs[count++] = sh->dev[pd_idx].page; |
1875 | ||
59fc630b | 1876 | BUG_ON(sh->batch_head); |
e46b272b | 1877 | pr_debug("%s: stripe %llu\n", __func__, |
91c00924 DW |
1878 | (unsigned long long)sh->sector); |
1879 | ||
1880 | for (i = disks; i--; ) { | |
1881 | struct r5dev *dev = &sh->dev[i]; | |
1882 | /* Only process blocks that are known to be uptodate */ | |
a7c224a8 YY |
1883 | if (test_bit(R5_InJournal, &dev->flags)) { |
1884 | /* | |
1885 | * For this case, PAGE_SIZE must be equal to 4KB and | |
1886 | * page offset is zero. | |
1887 | */ | |
1888 | off_srcs[count] = dev->offset; | |
1e6d690b | 1889 | xor_srcs[count++] = dev->orig_page; |
a7c224a8 YY |
1890 | } else if (test_bit(R5_Wantdrain, &dev->flags)) { |
1891 | off_srcs[count] = dev->offset; | |
91c00924 | 1892 | xor_srcs[count++] = dev->page; |
a7c224a8 | 1893 | } |
91c00924 DW |
1894 | } |
1895 | ||
0403e382 | 1896 | init_async_submit(&submit, ASYNC_TX_FENCE|ASYNC_TX_XOR_DROP_DST, tx, |
46d5b785 | 1897 | ops_complete_prexor, sh, to_addr_conv(sh, percpu, 0)); |
a7c224a8 | 1898 | tx = async_xor_offs(xor_dest, off_dest, xor_srcs, off_srcs, count, |
c911c46c | 1899 | RAID5_STRIPE_SIZE(sh->raid_conf), &submit); |
91c00924 DW |
1900 | |
1901 | return tx; | |
1902 | } | |
1903 | ||
584acdd4 MS |
1904 | static struct dma_async_tx_descriptor * |
1905 | ops_run_prexor6(struct stripe_head *sh, struct raid5_percpu *percpu, | |
1906 | struct dma_async_tx_descriptor *tx) | |
1907 | { | |
1908 | struct page **blocks = to_addr_page(percpu, 0); | |
d69454bc | 1909 | unsigned int *offs = to_addr_offs(sh, percpu); |
584acdd4 MS |
1910 | int count; |
1911 | struct async_submit_ctl submit; | |
1912 | ||
1913 | pr_debug("%s: stripe %llu\n", __func__, | |
1914 | (unsigned long long)sh->sector); | |
1915 | ||
d69454bc | 1916 | count = set_syndrome_sources(blocks, offs, sh, SYNDROME_SRC_WANT_DRAIN); |
584acdd4 MS |
1917 | |
1918 | init_async_submit(&submit, ASYNC_TX_FENCE|ASYNC_TX_PQ_XOR_DST, tx, | |
1919 | ops_complete_prexor, sh, to_addr_conv(sh, percpu, 0)); | |
d69454bc | 1920 | tx = async_gen_syndrome(blocks, offs, count+2, |
c911c46c | 1921 | RAID5_STRIPE_SIZE(sh->raid_conf), &submit); |
584acdd4 MS |
1922 | |
1923 | return tx; | |
1924 | } | |
1925 | ||
91c00924 | 1926 | static struct dma_async_tx_descriptor * |
d8ee0728 | 1927 | ops_run_biodrain(struct stripe_head *sh, struct dma_async_tx_descriptor *tx) |
91c00924 | 1928 | { |
1e6d690b | 1929 | struct r5conf *conf = sh->raid_conf; |
91c00924 | 1930 | int disks = sh->disks; |
d8ee0728 | 1931 | int i; |
59fc630b | 1932 | struct stripe_head *head_sh = sh; |
91c00924 | 1933 | |
e46b272b | 1934 | pr_debug("%s: stripe %llu\n", __func__, |
91c00924 DW |
1935 | (unsigned long long)sh->sector); |
1936 | ||
1937 | for (i = disks; i--; ) { | |
59fc630b | 1938 | struct r5dev *dev; |
91c00924 | 1939 | struct bio *chosen; |
91c00924 | 1940 | |
59fc630b | 1941 | sh = head_sh; |
1942 | if (test_and_clear_bit(R5_Wantdrain, &head_sh->dev[i].flags)) { | |
91c00924 DW |
1943 | struct bio *wbi; |
1944 | ||
59fc630b | 1945 | again: |
1946 | dev = &sh->dev[i]; | |
1e6d690b SL |
1947 | /* |
1948 | * clear R5_InJournal, so when rewriting a page in | |
1949 | * journal, it is not skipped by r5l_log_stripe() | |
1950 | */ | |
1951 | clear_bit(R5_InJournal, &dev->flags); | |
b17459c0 | 1952 | spin_lock_irq(&sh->stripe_lock); |
91c00924 DW |
1953 | chosen = dev->towrite; |
1954 | dev->towrite = NULL; | |
7a87f434 | 1955 | sh->overwrite_disks = 0; |
91c00924 DW |
1956 | BUG_ON(dev->written); |
1957 | wbi = dev->written = chosen; | |
b17459c0 | 1958 | spin_unlock_irq(&sh->stripe_lock); |
d592a996 | 1959 | WARN_ON(dev->page != dev->orig_page); |
91c00924 | 1960 | |
4f024f37 | 1961 | while (wbi && wbi->bi_iter.bi_sector < |
c911c46c | 1962 | dev->sector + RAID5_STRIPE_SECTORS(conf)) { |
1eff9d32 | 1963 | if (wbi->bi_opf & REQ_FUA) |
e9c7469b | 1964 | set_bit(R5_WantFUA, &dev->flags); |
1eff9d32 | 1965 | if (wbi->bi_opf & REQ_SYNC) |
bc0934f0 | 1966 | set_bit(R5_SyncIO, &dev->flags); |
796a5cf0 | 1967 | if (bio_op(wbi) == REQ_OP_DISCARD) |
620125f2 | 1968 | set_bit(R5_Discard, &dev->flags); |
d592a996 SL |
1969 | else { |
1970 | tx = async_copy_data(1, wbi, &dev->page, | |
248728dd | 1971 | dev->offset, |
1e6d690b SL |
1972 | dev->sector, tx, sh, |
1973 | r5c_is_writeback(conf->log)); | |
1974 | if (dev->page != dev->orig_page && | |
1975 | !r5c_is_writeback(conf->log)) { | |
d592a996 SL |
1976 | set_bit(R5_SkipCopy, &dev->flags); |
1977 | clear_bit(R5_UPTODATE, &dev->flags); | |
1978 | clear_bit(R5_OVERWRITE, &dev->flags); | |
1979 | } | |
1980 | } | |
c911c46c | 1981 | wbi = r5_next_bio(conf, wbi, dev->sector); |
91c00924 | 1982 | } |
59fc630b | 1983 | |
1984 | if (head_sh->batch_head) { | |
1985 | sh = list_first_entry(&sh->batch_list, | |
1986 | struct stripe_head, | |
1987 | batch_list); | |
1988 | if (sh == head_sh) | |
1989 | continue; | |
1990 | goto again; | |
1991 | } | |
91c00924 DW |
1992 | } |
1993 | } | |
1994 | ||
1995 | return tx; | |
1996 | } | |
1997 | ||
ac6b53b6 | 1998 | static void ops_complete_reconstruct(void *stripe_head_ref) |
91c00924 DW |
1999 | { |
2000 | struct stripe_head *sh = stripe_head_ref; | |
ac6b53b6 DW |
2001 | int disks = sh->disks; |
2002 | int pd_idx = sh->pd_idx; | |
2003 | int qd_idx = sh->qd_idx; | |
2004 | int i; | |
9e444768 | 2005 | bool fua = false, sync = false, discard = false; |
91c00924 | 2006 | |
e46b272b | 2007 | pr_debug("%s: stripe %llu\n", __func__, |
91c00924 DW |
2008 | (unsigned long long)sh->sector); |
2009 | ||
bc0934f0 | 2010 | for (i = disks; i--; ) { |
e9c7469b | 2011 | fua |= test_bit(R5_WantFUA, &sh->dev[i].flags); |
bc0934f0 | 2012 | sync |= test_bit(R5_SyncIO, &sh->dev[i].flags); |
9e444768 | 2013 | discard |= test_bit(R5_Discard, &sh->dev[i].flags); |
bc0934f0 | 2014 | } |
e9c7469b | 2015 | |
91c00924 DW |
2016 | for (i = disks; i--; ) { |
2017 | struct r5dev *dev = &sh->dev[i]; | |
ac6b53b6 | 2018 | |
e9c7469b | 2019 | if (dev->written || i == pd_idx || i == qd_idx) { |
235b6003 | 2020 | if (!discard && !test_bit(R5_SkipCopy, &dev->flags)) { |
9e444768 | 2021 | set_bit(R5_UPTODATE, &dev->flags); |
235b6003 N |
2022 | if (test_bit(STRIPE_EXPAND_READY, &sh->state)) |
2023 | set_bit(R5_Expanded, &dev->flags); | |
2024 | } | |
e9c7469b TH |
2025 | if (fua) |
2026 | set_bit(R5_WantFUA, &dev->flags); | |
bc0934f0 SL |
2027 | if (sync) |
2028 | set_bit(R5_SyncIO, &dev->flags); | |
e9c7469b | 2029 | } |
91c00924 DW |
2030 | } |
2031 | ||
d8ee0728 DW |
2032 | if (sh->reconstruct_state == reconstruct_state_drain_run) |
2033 | sh->reconstruct_state = reconstruct_state_drain_result; | |
2034 | else if (sh->reconstruct_state == reconstruct_state_prexor_drain_run) | |
2035 | sh->reconstruct_state = reconstruct_state_prexor_drain_result; | |
2036 | else { | |
2037 | BUG_ON(sh->reconstruct_state != reconstruct_state_run); | |
2038 | sh->reconstruct_state = reconstruct_state_result; | |
2039 | } | |
91c00924 DW |
2040 | |
2041 | set_bit(STRIPE_HANDLE, &sh->state); | |
6d036f7d | 2042 | raid5_release_stripe(sh); |
91c00924 DW |
2043 | } |
2044 | ||
2045 | static void | |
ac6b53b6 DW |
2046 | ops_run_reconstruct5(struct stripe_head *sh, struct raid5_percpu *percpu, |
2047 | struct dma_async_tx_descriptor *tx) | |
91c00924 | 2048 | { |
91c00924 | 2049 | int disks = sh->disks; |
59fc630b | 2050 | struct page **xor_srcs; |
7aba13b7 | 2051 | unsigned int *off_srcs; |
a08abd8c | 2052 | struct async_submit_ctl submit; |
59fc630b | 2053 | int count, pd_idx = sh->pd_idx, i; |
91c00924 | 2054 | struct page *xor_dest; |
7aba13b7 | 2055 | unsigned int off_dest; |
d8ee0728 | 2056 | int prexor = 0; |
91c00924 | 2057 | unsigned long flags; |
59fc630b | 2058 | int j = 0; |
2059 | struct stripe_head *head_sh = sh; | |
2060 | int last_stripe; | |
91c00924 | 2061 | |
e46b272b | 2062 | pr_debug("%s: stripe %llu\n", __func__, |
91c00924 DW |
2063 | (unsigned long long)sh->sector); |
2064 | ||
620125f2 SL |
2065 | for (i = 0; i < sh->disks; i++) { |
2066 | if (pd_idx == i) | |
2067 | continue; | |
2068 | if (!test_bit(R5_Discard, &sh->dev[i].flags)) | |
2069 | break; | |
2070 | } | |
2071 | if (i >= sh->disks) { | |
2072 | atomic_inc(&sh->count); | |
620125f2 SL |
2073 | set_bit(R5_Discard, &sh->dev[pd_idx].flags); |
2074 | ops_complete_reconstruct(sh); | |
2075 | return; | |
2076 | } | |
59fc630b | 2077 | again: |
2078 | count = 0; | |
2079 | xor_srcs = to_addr_page(percpu, j); | |
7aba13b7 | 2080 | off_srcs = to_addr_offs(sh, percpu); |
91c00924 DW |
2081 | /* check if prexor is active which means only process blocks |
2082 | * that are part of a read-modify-write (written) | |
2083 | */ | |
59fc630b | 2084 | if (head_sh->reconstruct_state == reconstruct_state_prexor_drain_run) { |
d8ee0728 | 2085 | prexor = 1; |
7aba13b7 | 2086 | off_dest = off_srcs[count] = sh->dev[pd_idx].offset; |
91c00924 DW |
2087 | xor_dest = xor_srcs[count++] = sh->dev[pd_idx].page; |
2088 | for (i = disks; i--; ) { | |
2089 | struct r5dev *dev = &sh->dev[i]; | |
1e6d690b | 2090 | if (head_sh->dev[i].written || |
7aba13b7 YY |
2091 | test_bit(R5_InJournal, &head_sh->dev[i].flags)) { |
2092 | off_srcs[count] = dev->offset; | |
91c00924 | 2093 | xor_srcs[count++] = dev->page; |
7aba13b7 | 2094 | } |
91c00924 DW |
2095 | } |
2096 | } else { | |
2097 | xor_dest = sh->dev[pd_idx].page; | |
7aba13b7 | 2098 | off_dest = sh->dev[pd_idx].offset; |
91c00924 DW |
2099 | for (i = disks; i--; ) { |
2100 | struct r5dev *dev = &sh->dev[i]; | |
7aba13b7 YY |
2101 | if (i != pd_idx) { |
2102 | off_srcs[count] = dev->offset; | |
91c00924 | 2103 | xor_srcs[count++] = dev->page; |
7aba13b7 | 2104 | } |
91c00924 DW |
2105 | } |
2106 | } | |
2107 | ||
91c00924 DW |
2108 | /* 1/ if we prexor'd then the dest is reused as a source |
2109 | * 2/ if we did not prexor then we are redoing the parity | |
2110 | * set ASYNC_TX_XOR_DROP_DST and ASYNC_TX_XOR_ZERO_DST | |
2111 | * for the synchronous xor case | |
2112 | */ | |
59fc630b | 2113 | last_stripe = !head_sh->batch_head || |
2114 | list_first_entry(&sh->batch_list, | |
2115 | struct stripe_head, batch_list) == head_sh; | |
2116 | if (last_stripe) { | |
2117 | flags = ASYNC_TX_ACK | | |
2118 | (prexor ? ASYNC_TX_XOR_DROP_DST : ASYNC_TX_XOR_ZERO_DST); | |
2119 | ||
2120 | atomic_inc(&head_sh->count); | |
2121 | init_async_submit(&submit, flags, tx, ops_complete_reconstruct, head_sh, | |
2122 | to_addr_conv(sh, percpu, j)); | |
2123 | } else { | |
2124 | flags = prexor ? ASYNC_TX_XOR_DROP_DST : ASYNC_TX_XOR_ZERO_DST; | |
2125 | init_async_submit(&submit, flags, tx, NULL, NULL, | |
2126 | to_addr_conv(sh, percpu, j)); | |
2127 | } | |
91c00924 | 2128 | |
a08abd8c | 2129 | if (unlikely(count == 1)) |
7aba13b7 | 2130 | tx = async_memcpy(xor_dest, xor_srcs[0], off_dest, off_srcs[0], |
c911c46c | 2131 | RAID5_STRIPE_SIZE(sh->raid_conf), &submit); |
a08abd8c | 2132 | else |
a7c224a8 | 2133 | tx = async_xor_offs(xor_dest, off_dest, xor_srcs, off_srcs, count, |
c911c46c | 2134 | RAID5_STRIPE_SIZE(sh->raid_conf), &submit); |
59fc630b | 2135 | if (!last_stripe) { |
2136 | j++; | |
2137 | sh = list_first_entry(&sh->batch_list, struct stripe_head, | |
2138 | batch_list); | |
2139 | goto again; | |
2140 | } | |
91c00924 DW |
2141 | } |
2142 | ||
ac6b53b6 DW |
2143 | static void |
2144 | ops_run_reconstruct6(struct stripe_head *sh, struct raid5_percpu *percpu, | |
2145 | struct dma_async_tx_descriptor *tx) | |
2146 | { | |
2147 | struct async_submit_ctl submit; | |
59fc630b | 2148 | struct page **blocks; |
d69454bc | 2149 | unsigned int *offs; |
59fc630b | 2150 | int count, i, j = 0; |
2151 | struct stripe_head *head_sh = sh; | |
2152 | int last_stripe; | |
584acdd4 MS |
2153 | int synflags; |
2154 | unsigned long txflags; | |
ac6b53b6 DW |
2155 | |
2156 | pr_debug("%s: stripe %llu\n", __func__, (unsigned long long)sh->sector); | |
2157 | ||
620125f2 SL |
2158 | for (i = 0; i < sh->disks; i++) { |
2159 | if (sh->pd_idx == i || sh->qd_idx == i) | |
2160 | continue; | |
2161 | if (!test_bit(R5_Discard, &sh->dev[i].flags)) | |
2162 | break; | |
2163 | } | |
2164 | if (i >= sh->disks) { | |
2165 | atomic_inc(&sh->count); | |
620125f2 SL |
2166 | set_bit(R5_Discard, &sh->dev[sh->pd_idx].flags); |
2167 | set_bit(R5_Discard, &sh->dev[sh->qd_idx].flags); | |
2168 | ops_complete_reconstruct(sh); | |
2169 | return; | |
2170 | } | |
2171 | ||
59fc630b | 2172 | again: |
2173 | blocks = to_addr_page(percpu, j); | |
d69454bc | 2174 | offs = to_addr_offs(sh, percpu); |
584acdd4 MS |
2175 | |
2176 | if (sh->reconstruct_state == reconstruct_state_prexor_drain_run) { | |
2177 | synflags = SYNDROME_SRC_WRITTEN; | |
2178 | txflags = ASYNC_TX_ACK | ASYNC_TX_PQ_XOR_DST; | |
2179 | } else { | |
2180 | synflags = SYNDROME_SRC_ALL; | |
2181 | txflags = ASYNC_TX_ACK; | |
2182 | } | |
2183 | ||
d69454bc | 2184 | count = set_syndrome_sources(blocks, offs, sh, synflags); |
59fc630b | 2185 | last_stripe = !head_sh->batch_head || |
2186 | list_first_entry(&sh->batch_list, | |
2187 | struct stripe_head, batch_list) == head_sh; | |
2188 | ||
2189 | if (last_stripe) { | |
2190 | atomic_inc(&head_sh->count); | |
584acdd4 | 2191 | init_async_submit(&submit, txflags, tx, ops_complete_reconstruct, |
59fc630b | 2192 | head_sh, to_addr_conv(sh, percpu, j)); |
2193 | } else | |
2194 | init_async_submit(&submit, 0, tx, NULL, NULL, | |
2195 | to_addr_conv(sh, percpu, j)); | |
d69454bc | 2196 | tx = async_gen_syndrome(blocks, offs, count+2, |
c911c46c | 2197 | RAID5_STRIPE_SIZE(sh->raid_conf), &submit); |
59fc630b | 2198 | if (!last_stripe) { |
2199 | j++; | |
2200 | sh = list_first_entry(&sh->batch_list, struct stripe_head, | |
2201 | batch_list); | |
2202 | goto again; | |
2203 | } | |
91c00924 DW |
2204 | } |
2205 | ||
2206 | static void ops_complete_check(void *stripe_head_ref) | |
2207 | { | |
2208 | struct stripe_head *sh = stripe_head_ref; | |
91c00924 | 2209 | |
e46b272b | 2210 | pr_debug("%s: stripe %llu\n", __func__, |
91c00924 DW |
2211 | (unsigned long long)sh->sector); |
2212 | ||
ecc65c9b | 2213 | sh->check_state = check_state_check_result; |
91c00924 | 2214 | set_bit(STRIPE_HANDLE, &sh->state); |
6d036f7d | 2215 | raid5_release_stripe(sh); |
91c00924 DW |
2216 | } |
2217 | ||
ac6b53b6 | 2218 | static void ops_run_check_p(struct stripe_head *sh, struct raid5_percpu *percpu) |
91c00924 | 2219 | { |
91c00924 | 2220 | int disks = sh->disks; |
ac6b53b6 DW |
2221 | int pd_idx = sh->pd_idx; |
2222 | int qd_idx = sh->qd_idx; | |
2223 | struct page *xor_dest; | |
a7c224a8 | 2224 | unsigned int off_dest; |
46d5b785 | 2225 | struct page **xor_srcs = to_addr_page(percpu, 0); |
a7c224a8 | 2226 | unsigned int *off_srcs = to_addr_offs(sh, percpu); |
91c00924 | 2227 | struct dma_async_tx_descriptor *tx; |
a08abd8c | 2228 | struct async_submit_ctl submit; |
ac6b53b6 DW |
2229 | int count; |
2230 | int i; | |
91c00924 | 2231 | |
e46b272b | 2232 | pr_debug("%s: stripe %llu\n", __func__, |
91c00924 DW |
2233 | (unsigned long long)sh->sector); |
2234 | ||
59fc630b | 2235 | BUG_ON(sh->batch_head); |
ac6b53b6 DW |
2236 | count = 0; |
2237 | xor_dest = sh->dev[pd_idx].page; | |
a7c224a8 YY |
2238 | off_dest = sh->dev[pd_idx].offset; |
2239 | off_srcs[count] = off_dest; | |
ac6b53b6 | 2240 | xor_srcs[count++] = xor_dest; |
91c00924 | 2241 | for (i = disks; i--; ) { |
ac6b53b6 DW |
2242 | if (i == pd_idx || i == qd_idx) |
2243 | continue; | |
a7c224a8 | 2244 | off_srcs[count] = sh->dev[i].offset; |
ac6b53b6 | 2245 | xor_srcs[count++] = sh->dev[i].page; |
91c00924 DW |
2246 | } |
2247 | ||
d6f38f31 | 2248 | init_async_submit(&submit, 0, NULL, NULL, NULL, |
46d5b785 | 2249 | to_addr_conv(sh, percpu, 0)); |
a7c224a8 | 2250 | tx = async_xor_val_offs(xor_dest, off_dest, xor_srcs, off_srcs, count, |
c911c46c | 2251 | RAID5_STRIPE_SIZE(sh->raid_conf), |
a08abd8c | 2252 | &sh->ops.zero_sum_result, &submit); |
91c00924 | 2253 | |
91c00924 | 2254 | atomic_inc(&sh->count); |
a08abd8c DW |
2255 | init_async_submit(&submit, ASYNC_TX_ACK, tx, ops_complete_check, sh, NULL); |
2256 | tx = async_trigger_callback(&submit); | |
91c00924 DW |
2257 | } |
2258 | ||
ac6b53b6 DW |
2259 | static void ops_run_check_pq(struct stripe_head *sh, struct raid5_percpu *percpu, int checkp) |
2260 | { | |
46d5b785 | 2261 | struct page **srcs = to_addr_page(percpu, 0); |
d69454bc | 2262 | unsigned int *offs = to_addr_offs(sh, percpu); |
ac6b53b6 DW |
2263 | struct async_submit_ctl submit; |
2264 | int count; | |
2265 | ||
2266 | pr_debug("%s: stripe %llu checkp: %d\n", __func__, | |
2267 | (unsigned long long)sh->sector, checkp); | |
2268 | ||
59fc630b | 2269 | BUG_ON(sh->batch_head); |
d69454bc | 2270 | count = set_syndrome_sources(srcs, offs, sh, SYNDROME_SRC_ALL); |
ac6b53b6 DW |
2271 | if (!checkp) |
2272 | srcs[count] = NULL; | |
91c00924 | 2273 | |
91c00924 | 2274 | atomic_inc(&sh->count); |
ac6b53b6 | 2275 | init_async_submit(&submit, ASYNC_TX_ACK, NULL, ops_complete_check, |
46d5b785 | 2276 | sh, to_addr_conv(sh, percpu, 0)); |
d69454bc | 2277 | async_syndrome_val(srcs, offs, count+2, |
c911c46c | 2278 | RAID5_STRIPE_SIZE(sh->raid_conf), |
d69454bc | 2279 | &sh->ops.zero_sum_result, percpu->spare_page, 0, &submit); |
91c00924 DW |
2280 | } |
2281 | ||
51acbcec | 2282 | static void raid_run_ops(struct stripe_head *sh, unsigned long ops_request) |
91c00924 DW |
2283 | { |
2284 | int overlap_clear = 0, i, disks = sh->disks; | |
2285 | struct dma_async_tx_descriptor *tx = NULL; | |
d1688a6d | 2286 | struct r5conf *conf = sh->raid_conf; |
ac6b53b6 | 2287 | int level = conf->level; |
d6f38f31 | 2288 | struct raid5_percpu *percpu; |
91c00924 | 2289 | |
770b1d21 DB |
2290 | local_lock(&conf->percpu->lock); |
2291 | percpu = this_cpu_ptr(conf->percpu); | |
83de75cc | 2292 | if (test_bit(STRIPE_OP_BIOFILL, &ops_request)) { |
91c00924 DW |
2293 | ops_run_biofill(sh); |
2294 | overlap_clear++; | |
2295 | } | |
2296 | ||
7b3a871e | 2297 | if (test_bit(STRIPE_OP_COMPUTE_BLK, &ops_request)) { |
ac6b53b6 DW |
2298 | if (level < 6) |
2299 | tx = ops_run_compute5(sh, percpu); | |
2300 | else { | |
2301 | if (sh->ops.target2 < 0 || sh->ops.target < 0) | |
2302 | tx = ops_run_compute6_1(sh, percpu); | |
2303 | else | |
2304 | tx = ops_run_compute6_2(sh, percpu); | |
2305 | } | |
2306 | /* terminate the chain if reconstruct is not set to be run */ | |
2307 | if (tx && !test_bit(STRIPE_OP_RECONSTRUCT, &ops_request)) | |
7b3a871e DW |
2308 | async_tx_ack(tx); |
2309 | } | |
91c00924 | 2310 | |
584acdd4 MS |
2311 | if (test_bit(STRIPE_OP_PREXOR, &ops_request)) { |
2312 | if (level < 6) | |
2313 | tx = ops_run_prexor5(sh, percpu, tx); | |
2314 | else | |
2315 | tx = ops_run_prexor6(sh, percpu, tx); | |
2316 | } | |
91c00924 | 2317 | |
ae1713e2 AP |
2318 | if (test_bit(STRIPE_OP_PARTIAL_PARITY, &ops_request)) |
2319 | tx = ops_run_partial_parity(sh, percpu, tx); | |
2320 | ||
600aa109 | 2321 | if (test_bit(STRIPE_OP_BIODRAIN, &ops_request)) { |
d8ee0728 | 2322 | tx = ops_run_biodrain(sh, tx); |
91c00924 DW |
2323 | overlap_clear++; |
2324 | } | |
2325 | ||
ac6b53b6 DW |
2326 | if (test_bit(STRIPE_OP_RECONSTRUCT, &ops_request)) { |
2327 | if (level < 6) | |
2328 | ops_run_reconstruct5(sh, percpu, tx); | |
2329 | else | |
2330 | ops_run_reconstruct6(sh, percpu, tx); | |
2331 | } | |
91c00924 | 2332 | |
ac6b53b6 DW |
2333 | if (test_bit(STRIPE_OP_CHECK, &ops_request)) { |
2334 | if (sh->check_state == check_state_run) | |
2335 | ops_run_check_p(sh, percpu); | |
2336 | else if (sh->check_state == check_state_run_q) | |
2337 | ops_run_check_pq(sh, percpu, 0); | |
2338 | else if (sh->check_state == check_state_run_pq) | |
2339 | ops_run_check_pq(sh, percpu, 1); | |
2340 | else | |
2341 | BUG(); | |
2342 | } | |
91c00924 | 2343 | |
770b1d21 | 2344 | if (overlap_clear && !sh->batch_head) { |
91c00924 DW |
2345 | for (i = disks; i--; ) { |
2346 | struct r5dev *dev = &sh->dev[i]; | |
2347 | if (test_and_clear_bit(R5_Overlap, &dev->flags)) | |
2348 | wake_up(&sh->raid_conf->wait_for_overlap); | |
2349 | } | |
770b1d21 DB |
2350 | } |
2351 | local_unlock(&conf->percpu->lock); | |
91c00924 DW |
2352 | } |
2353 | ||
845b9e22 AP |
2354 | static void free_stripe(struct kmem_cache *sc, struct stripe_head *sh) |
2355 | { | |
046169f0 YY |
2356 | #if PAGE_SIZE != DEFAULT_STRIPE_SIZE |
2357 | kfree(sh->pages); | |
2358 | #endif | |
845b9e22 AP |
2359 | if (sh->ppl_page) |
2360 | __free_page(sh->ppl_page); | |
2361 | kmem_cache_free(sc, sh); | |
2362 | } | |
2363 | ||
5f9d1fde | 2364 | static struct stripe_head *alloc_stripe(struct kmem_cache *sc, gfp_t gfp, |
845b9e22 | 2365 | int disks, struct r5conf *conf) |
f18c1a35 N |
2366 | { |
2367 | struct stripe_head *sh; | |
2368 | ||
2369 | sh = kmem_cache_zalloc(sc, gfp); | |
2370 | if (sh) { | |
2371 | spin_lock_init(&sh->stripe_lock); | |
2372 | spin_lock_init(&sh->batch_lock); | |
2373 | INIT_LIST_HEAD(&sh->batch_list); | |
2374 | INIT_LIST_HEAD(&sh->lru); | |
a39f7afd | 2375 | INIT_LIST_HEAD(&sh->r5c); |
d7bd398e | 2376 | INIT_LIST_HEAD(&sh->log_list); |
f18c1a35 | 2377 | atomic_set(&sh->count, 1); |
845b9e22 | 2378 | sh->raid_conf = conf; |
a39f7afd | 2379 | sh->log_start = MaxSector; |
845b9e22 AP |
2380 | |
2381 | if (raid5_has_ppl(conf)) { | |
2382 | sh->ppl_page = alloc_page(gfp); | |
2383 | if (!sh->ppl_page) { | |
2384 | free_stripe(sc, sh); | |
046169f0 | 2385 | return NULL; |
845b9e22 AP |
2386 | } |
2387 | } | |
046169f0 YY |
2388 | #if PAGE_SIZE != DEFAULT_STRIPE_SIZE |
2389 | if (init_stripe_shared_pages(sh, conf, disks)) { | |
2390 | free_stripe(sc, sh); | |
2391 | return NULL; | |
2392 | } | |
2393 | #endif | |
f18c1a35 N |
2394 | } |
2395 | return sh; | |
2396 | } | |
486f0644 | 2397 | static int grow_one_stripe(struct r5conf *conf, gfp_t gfp) |
1da177e4 LT |
2398 | { |
2399 | struct stripe_head *sh; | |
f18c1a35 | 2400 | |
845b9e22 | 2401 | sh = alloc_stripe(conf->slab_cache, gfp, conf->pool_size, conf); |
3f294f4f N |
2402 | if (!sh) |
2403 | return 0; | |
6ce32846 | 2404 | |
a9683a79 | 2405 | if (grow_buffers(sh, gfp)) { |
e4e11e38 | 2406 | shrink_buffers(sh); |
845b9e22 | 2407 | free_stripe(conf->slab_cache, sh); |
3f294f4f N |
2408 | return 0; |
2409 | } | |
486f0644 N |
2410 | sh->hash_lock_index = |
2411 | conf->max_nr_stripes % NR_STRIPE_HASH_LOCKS; | |
3f294f4f | 2412 | /* we just created an active stripe so... */ |
3f294f4f | 2413 | atomic_inc(&conf->active_stripes); |
59fc630b | 2414 | |
6d036f7d | 2415 | raid5_release_stripe(sh); |
486f0644 | 2416 | conf->max_nr_stripes++; |
3f294f4f N |
2417 | return 1; |
2418 | } | |
2419 | ||
d1688a6d | 2420 | static int grow_stripes(struct r5conf *conf, int num) |
3f294f4f | 2421 | { |
e18b890b | 2422 | struct kmem_cache *sc; |
53b8d89d | 2423 | size_t namelen = sizeof(conf->cache_name[0]); |
5e5e3e78 | 2424 | int devs = max(conf->raid_disks, conf->previous_raid_disks); |
1da177e4 | 2425 | |
f4be6b43 | 2426 | if (conf->mddev->gendisk) |
53b8d89d | 2427 | snprintf(conf->cache_name[0], namelen, |
f4be6b43 N |
2428 | "raid%d-%s", conf->level, mdname(conf->mddev)); |
2429 | else | |
53b8d89d | 2430 | snprintf(conf->cache_name[0], namelen, |
f4be6b43 | 2431 | "raid%d-%p", conf->level, conf->mddev); |
53b8d89d | 2432 | snprintf(conf->cache_name[1], namelen, "%.27s-alt", conf->cache_name[0]); |
f4be6b43 | 2433 | |
ad01c9e3 N |
2434 | conf->active_name = 0; |
2435 | sc = kmem_cache_create(conf->cache_name[conf->active_name], | |
1da177e4 | 2436 | sizeof(struct stripe_head)+(devs-1)*sizeof(struct r5dev), |
20c2df83 | 2437 | 0, 0, NULL); |
1da177e4 LT |
2438 | if (!sc) |
2439 | return 1; | |
2440 | conf->slab_cache = sc; | |
ad01c9e3 | 2441 | conf->pool_size = devs; |
486f0644 N |
2442 | while (num--) |
2443 | if (!grow_one_stripe(conf, GFP_KERNEL)) | |
1da177e4 | 2444 | return 1; |
486f0644 | 2445 | |
1da177e4 LT |
2446 | return 0; |
2447 | } | |
29269553 | 2448 | |
d6f38f31 | 2449 | /** |
7f8a30e5 CL |
2450 | * scribble_alloc - allocate percpu scribble buffer for required size |
2451 | * of the scribble region | |
2aada5b1 DLM |
2452 | * @percpu: from for_each_present_cpu() of the caller |
2453 | * @num: total number of disks in the array | |
2454 | * @cnt: scribble objs count for required size of the scribble region | |
d6f38f31 | 2455 | * |
7f8a30e5 | 2456 | * The scribble buffer size must be enough to contain: |
d6f38f31 DW |
2457 | * 1/ a struct page pointer for each device in the array +2 |
2458 | * 2/ room to convert each entry in (1) to its corresponding dma | |
2459 | * (dma_map_page()) or page (page_address()) address. | |
2460 | * | |
2461 | * Note: the +2 is for the destination buffers of the ddf/raid6 case where we | |
2462 | * calculate over all devices (not just the data blocks), using zeros in place | |
2463 | * of the P and Q blocks. | |
2464 | */ | |
b330e6a4 | 2465 | static int scribble_alloc(struct raid5_percpu *percpu, |
ba54d4d4 | 2466 | int num, int cnt) |
d6f38f31 | 2467 | { |
b330e6a4 | 2468 | size_t obj_size = |
7aba13b7 YY |
2469 | sizeof(struct page *) * (num + 2) + |
2470 | sizeof(addr_conv_t) * (num + 2) + | |
2471 | sizeof(unsigned int) * (num + 2); | |
b330e6a4 | 2472 | void *scribble; |
d6f38f31 | 2473 | |
ba54d4d4 CL |
2474 | /* |
2475 | * If here is in raid array suspend context, it is in memalloc noio | |
2476 | * context as well, there is no potential recursive memory reclaim | |
2477 | * I/Os with the GFP_KERNEL flag. | |
2478 | */ | |
2479 | scribble = kvmalloc_array(cnt, obj_size, GFP_KERNEL); | |
b330e6a4 KO |
2480 | if (!scribble) |
2481 | return -ENOMEM; | |
2482 | ||
2483 | kvfree(percpu->scribble); | |
2484 | ||
2485 | percpu->scribble = scribble; | |
2486 | percpu->scribble_obj_size = obj_size; | |
2487 | return 0; | |
d6f38f31 DW |
2488 | } |
2489 | ||
738a2738 N |
2490 | static int resize_chunks(struct r5conf *conf, int new_disks, int new_sectors) |
2491 | { | |
2492 | unsigned long cpu; | |
2493 | int err = 0; | |
2494 | ||
27a353c0 SL |
2495 | /* |
2496 | * Never shrink. And mddev_suspend() could deadlock if this is called | |
2497 | * from raid5d. In that case, scribble_disks and scribble_sectors | |
2498 | * should equal to new_disks and new_sectors | |
2499 | */ | |
2500 | if (conf->scribble_disks >= new_disks && | |
2501 | conf->scribble_sectors >= new_sectors) | |
2502 | return 0; | |
738a2738 | 2503 | mddev_suspend(conf->mddev); |
252034e0 | 2504 | cpus_read_lock(); |
b330e6a4 | 2505 | |
738a2738 N |
2506 | for_each_present_cpu(cpu) { |
2507 | struct raid5_percpu *percpu; | |
738a2738 N |
2508 | |
2509 | percpu = per_cpu_ptr(conf->percpu, cpu); | |
b330e6a4 | 2510 | err = scribble_alloc(percpu, new_disks, |
c911c46c | 2511 | new_sectors / RAID5_STRIPE_SECTORS(conf)); |
b330e6a4 | 2512 | if (err) |
738a2738 | 2513 | break; |
738a2738 | 2514 | } |
b330e6a4 | 2515 | |
252034e0 | 2516 | cpus_read_unlock(); |
738a2738 | 2517 | mddev_resume(conf->mddev); |
27a353c0 SL |
2518 | if (!err) { |
2519 | conf->scribble_disks = new_disks; | |
2520 | conf->scribble_sectors = new_sectors; | |
2521 | } | |
738a2738 N |
2522 | return err; |
2523 | } | |
2524 | ||
d1688a6d | 2525 | static int resize_stripes(struct r5conf *conf, int newsize) |
ad01c9e3 N |
2526 | { |
2527 | /* Make all the stripes able to hold 'newsize' devices. | |
2528 | * New slots in each stripe get 'page' set to a new page. | |
2529 | * | |
2530 | * This happens in stages: | |
2531 | * 1/ create a new kmem_cache and allocate the required number of | |
2532 | * stripe_heads. | |
83f0d77a | 2533 | * 2/ gather all the old stripe_heads and transfer the pages across |
ad01c9e3 N |
2534 | * to the new stripe_heads. This will have the side effect of |
2535 | * freezing the array as once all stripe_heads have been collected, | |
2536 | * no IO will be possible. Old stripe heads are freed once their | |
2537 | * pages have been transferred over, and the old kmem_cache is | |
2538 | * freed when all stripes are done. | |
2539 | * 3/ reallocate conf->disks to be suitable bigger. If this fails, | |
3560741e | 2540 | * we simple return a failure status - no need to clean anything up. |
ad01c9e3 N |
2541 | * 4/ allocate new pages for the new slots in the new stripe_heads. |
2542 | * If this fails, we don't bother trying the shrink the | |
2543 | * stripe_heads down again, we just leave them as they are. | |
2544 | * As each stripe_head is processed the new one is released into | |
2545 | * active service. | |
2546 | * | |
2547 | * Once step2 is started, we cannot afford to wait for a write, | |
2548 | * so we use GFP_NOIO allocations. | |
2549 | */ | |
2550 | struct stripe_head *osh, *nsh; | |
2551 | LIST_HEAD(newstripes); | |
2552 | struct disk_info *ndisks; | |
2214c260 | 2553 | int err = 0; |
e18b890b | 2554 | struct kmem_cache *sc; |
ad01c9e3 | 2555 | int i; |
566c09c5 | 2556 | int hash, cnt; |
ad01c9e3 | 2557 | |
2214c260 | 2558 | md_allow_write(conf->mddev); |
2a2275d6 | 2559 | |
ad01c9e3 N |
2560 | /* Step 1 */ |
2561 | sc = kmem_cache_create(conf->cache_name[1-conf->active_name], | |
2562 | sizeof(struct stripe_head)+(newsize-1)*sizeof(struct r5dev), | |
20c2df83 | 2563 | 0, 0, NULL); |
ad01c9e3 N |
2564 | if (!sc) |
2565 | return -ENOMEM; | |
2566 | ||
2d5b569b N |
2567 | /* Need to ensure auto-resizing doesn't interfere */ |
2568 | mutex_lock(&conf->cache_size_mutex); | |
2569 | ||
ad01c9e3 | 2570 | for (i = conf->max_nr_stripes; i; i--) { |
845b9e22 | 2571 | nsh = alloc_stripe(sc, GFP_KERNEL, newsize, conf); |
ad01c9e3 N |
2572 | if (!nsh) |
2573 | break; | |
2574 | ||
ad01c9e3 N |
2575 | list_add(&nsh->lru, &newstripes); |
2576 | } | |
2577 | if (i) { | |
2578 | /* didn't get enough, give up */ | |
2579 | while (!list_empty(&newstripes)) { | |
2580 | nsh = list_entry(newstripes.next, struct stripe_head, lru); | |
2581 | list_del(&nsh->lru); | |
845b9e22 | 2582 | free_stripe(sc, nsh); |
ad01c9e3 N |
2583 | } |
2584 | kmem_cache_destroy(sc); | |
2d5b569b | 2585 | mutex_unlock(&conf->cache_size_mutex); |
ad01c9e3 N |
2586 | return -ENOMEM; |
2587 | } | |
2588 | /* Step 2 - Must use GFP_NOIO now. | |
2589 | * OK, we have enough stripes, start collecting inactive | |
2590 | * stripes and copying them over | |
2591 | */ | |
566c09c5 SL |
2592 | hash = 0; |
2593 | cnt = 0; | |
ad01c9e3 | 2594 | list_for_each_entry(nsh, &newstripes, lru) { |
566c09c5 | 2595 | lock_device_hash_lock(conf, hash); |
6ab2a4b8 | 2596 | wait_event_cmd(conf->wait_for_stripe, |
566c09c5 SL |
2597 | !list_empty(conf->inactive_list + hash), |
2598 | unlock_device_hash_lock(conf, hash), | |
2599 | lock_device_hash_lock(conf, hash)); | |
2600 | osh = get_free_stripe(conf, hash); | |
2601 | unlock_device_hash_lock(conf, hash); | |
f18c1a35 | 2602 | |
f16acaf3 YY |
2603 | #if PAGE_SIZE != DEFAULT_STRIPE_SIZE |
2604 | for (i = 0; i < osh->nr_pages; i++) { | |
2605 | nsh->pages[i] = osh->pages[i]; | |
2606 | osh->pages[i] = NULL; | |
2607 | } | |
2608 | #endif | |
d592a996 | 2609 | for(i=0; i<conf->pool_size; i++) { |
ad01c9e3 | 2610 | nsh->dev[i].page = osh->dev[i].page; |
d592a996 | 2611 | nsh->dev[i].orig_page = osh->dev[i].page; |
7aba13b7 | 2612 | nsh->dev[i].offset = osh->dev[i].offset; |
d592a996 | 2613 | } |
566c09c5 | 2614 | nsh->hash_lock_index = hash; |
845b9e22 | 2615 | free_stripe(conf->slab_cache, osh); |
566c09c5 SL |
2616 | cnt++; |
2617 | if (cnt >= conf->max_nr_stripes / NR_STRIPE_HASH_LOCKS + | |
2618 | !!((conf->max_nr_stripes % NR_STRIPE_HASH_LOCKS) > hash)) { | |
2619 | hash++; | |
2620 | cnt = 0; | |
2621 | } | |
ad01c9e3 N |
2622 | } |
2623 | kmem_cache_destroy(conf->slab_cache); | |
2624 | ||
2625 | /* Step 3. | |
2626 | * At this point, we are holding all the stripes so the array | |
2627 | * is completely stalled, so now is a good time to resize | |
d6f38f31 | 2628 | * conf->disks and the scribble region |
ad01c9e3 | 2629 | */ |
6396bb22 | 2630 | ndisks = kcalloc(newsize, sizeof(struct disk_info), GFP_NOIO); |
ad01c9e3 | 2631 | if (ndisks) { |
d7bd398e | 2632 | for (i = 0; i < conf->pool_size; i++) |
ad01c9e3 | 2633 | ndisks[i] = conf->disks[i]; |
d7bd398e SL |
2634 | |
2635 | for (i = conf->pool_size; i < newsize; i++) { | |
2636 | ndisks[i].extra_page = alloc_page(GFP_NOIO); | |
2637 | if (!ndisks[i].extra_page) | |
2638 | err = -ENOMEM; | |
2639 | } | |
2640 | ||
2641 | if (err) { | |
2642 | for (i = conf->pool_size; i < newsize; i++) | |
2643 | if (ndisks[i].extra_page) | |
2644 | put_page(ndisks[i].extra_page); | |
2645 | kfree(ndisks); | |
2646 | } else { | |
2647 | kfree(conf->disks); | |
2648 | conf->disks = ndisks; | |
2649 | } | |
ad01c9e3 N |
2650 | } else |
2651 | err = -ENOMEM; | |
2652 | ||
583da48e DY |
2653 | conf->slab_cache = sc; |
2654 | conf->active_name = 1-conf->active_name; | |
2655 | ||
ad01c9e3 N |
2656 | /* Step 4, return new stripes to service */ |
2657 | while(!list_empty(&newstripes)) { | |
2658 | nsh = list_entry(newstripes.next, struct stripe_head, lru); | |
2659 | list_del_init(&nsh->lru); | |
d6f38f31 | 2660 | |
f16acaf3 YY |
2661 | #if PAGE_SIZE != DEFAULT_STRIPE_SIZE |
2662 | for (i = 0; i < nsh->nr_pages; i++) { | |
2663 | if (nsh->pages[i]) | |
2664 | continue; | |
2665 | nsh->pages[i] = alloc_page(GFP_NOIO); | |
2666 | if (!nsh->pages[i]) | |
2667 | err = -ENOMEM; | |
2668 | } | |
2669 | ||
2670 | for (i = conf->raid_disks; i < newsize; i++) { | |
2671 | if (nsh->dev[i].page) | |
2672 | continue; | |
2673 | nsh->dev[i].page = raid5_get_dev_page(nsh, i); | |
2674 | nsh->dev[i].orig_page = nsh->dev[i].page; | |
2675 | nsh->dev[i].offset = raid5_get_page_offset(nsh, i); | |
2676 | } | |
2677 | #else | |
ad01c9e3 N |
2678 | for (i=conf->raid_disks; i < newsize; i++) |
2679 | if (nsh->dev[i].page == NULL) { | |
2680 | struct page *p = alloc_page(GFP_NOIO); | |
2681 | nsh->dev[i].page = p; | |
d592a996 | 2682 | nsh->dev[i].orig_page = p; |
7aba13b7 | 2683 | nsh->dev[i].offset = 0; |
ad01c9e3 N |
2684 | if (!p) |
2685 | err = -ENOMEM; | |
2686 | } | |
f16acaf3 | 2687 | #endif |
6d036f7d | 2688 | raid5_release_stripe(nsh); |
ad01c9e3 N |
2689 | } |
2690 | /* critical section pass, GFP_NOIO no longer needed */ | |
2691 | ||
6e9eac2d N |
2692 | if (!err) |
2693 | conf->pool_size = newsize; | |
b44c018c SL |
2694 | mutex_unlock(&conf->cache_size_mutex); |
2695 | ||
ad01c9e3 N |
2696 | return err; |
2697 | } | |
1da177e4 | 2698 | |
486f0644 | 2699 | static int drop_one_stripe(struct r5conf *conf) |
1da177e4 LT |
2700 | { |
2701 | struct stripe_head *sh; | |
49895bcc | 2702 | int hash = (conf->max_nr_stripes - 1) & STRIPE_HASH_LOCKS_MASK; |
1da177e4 | 2703 | |
566c09c5 SL |
2704 | spin_lock_irq(conf->hash_locks + hash); |
2705 | sh = get_free_stripe(conf, hash); | |
2706 | spin_unlock_irq(conf->hash_locks + hash); | |
3f294f4f N |
2707 | if (!sh) |
2708 | return 0; | |
78bafebd | 2709 | BUG_ON(atomic_read(&sh->count)); |
e4e11e38 | 2710 | shrink_buffers(sh); |
845b9e22 | 2711 | free_stripe(conf->slab_cache, sh); |
3f294f4f | 2712 | atomic_dec(&conf->active_stripes); |
486f0644 | 2713 | conf->max_nr_stripes--; |
3f294f4f N |
2714 | return 1; |
2715 | } | |
2716 | ||
d1688a6d | 2717 | static void shrink_stripes(struct r5conf *conf) |
3f294f4f | 2718 | { |
486f0644 N |
2719 | while (conf->max_nr_stripes && |
2720 | drop_one_stripe(conf)) | |
2721 | ; | |
3f294f4f | 2722 | |
644df1a8 | 2723 | kmem_cache_destroy(conf->slab_cache); |
1da177e4 LT |
2724 | conf->slab_cache = NULL; |
2725 | } | |
2726 | ||
e38b0432 LG |
2727 | /* |
2728 | * This helper wraps rcu_dereference_protected() and can be used when | |
2729 | * it is known that the nr_pending of the rdev is elevated. | |
2730 | */ | |
2731 | static struct md_rdev *rdev_pend_deref(struct md_rdev __rcu *rdev) | |
2732 | { | |
2733 | return rcu_dereference_protected(rdev, | |
2734 | atomic_read(&rcu_access_pointer(rdev)->nr_pending)); | |
2735 | } | |
2736 | ||
9aeb7f99 LG |
2737 | /* |
2738 | * This helper wraps rcu_dereference_protected() and should be used | |
2739 | * when it is known that the mddev_lock() is held. This is safe | |
2740 | * seeing raid5_remove_disk() has the same lock held. | |
2741 | */ | |
2742 | static struct md_rdev *rdev_mdlock_deref(struct mddev *mddev, | |
2743 | struct md_rdev __rcu *rdev) | |
2744 | { | |
2745 | return rcu_dereference_protected(rdev, | |
2746 | lockdep_is_held(&mddev->reconfig_mutex)); | |
2747 | } | |
2748 | ||
4246a0b6 | 2749 | static void raid5_end_read_request(struct bio * bi) |
1da177e4 | 2750 | { |
99c0fb5f | 2751 | struct stripe_head *sh = bi->bi_private; |
d1688a6d | 2752 | struct r5conf *conf = sh->raid_conf; |
7ecaa1e6 | 2753 | int disks = sh->disks, i; |
dd054fce | 2754 | struct md_rdev *rdev = NULL; |
05616be5 | 2755 | sector_t s; |
1da177e4 LT |
2756 | |
2757 | for (i=0 ; i<disks; i++) | |
2758 | if (bi == &sh->dev[i].req) | |
2759 | break; | |
2760 | ||
4246a0b6 | 2761 | pr_debug("end_read_request %llu/%d, count: %d, error %d.\n", |
45b4233c | 2762 | (unsigned long long)sh->sector, i, atomic_read(&sh->count), |
4e4cbee9 | 2763 | bi->bi_status); |
1da177e4 LT |
2764 | if (i == disks) { |
2765 | BUG(); | |
6712ecf8 | 2766 | return; |
1da177e4 | 2767 | } |
14a75d3e | 2768 | if (test_bit(R5_ReadRepl, &sh->dev[i].flags)) |
dd054fce N |
2769 | /* If replacement finished while this request was outstanding, |
2770 | * 'replacement' might be NULL already. | |
2771 | * In that case it moved down to 'rdev'. | |
2772 | * rdev is not removed until all requests are finished. | |
2773 | */ | |
e38b0432 | 2774 | rdev = rdev_pend_deref(conf->disks[i].replacement); |
dd054fce | 2775 | if (!rdev) |
e38b0432 | 2776 | rdev = rdev_pend_deref(conf->disks[i].rdev); |
1da177e4 | 2777 | |
05616be5 N |
2778 | if (use_new_offset(conf, sh)) |
2779 | s = sh->sector + rdev->new_data_offset; | |
2780 | else | |
2781 | s = sh->sector + rdev->data_offset; | |
4e4cbee9 | 2782 | if (!bi->bi_status) { |
1da177e4 | 2783 | set_bit(R5_UPTODATE, &sh->dev[i].flags); |
4e5314b5 | 2784 | if (test_bit(R5_ReadError, &sh->dev[i].flags)) { |
14a75d3e N |
2785 | /* Note that this cannot happen on a |
2786 | * replacement device. We just fail those on | |
2787 | * any error | |
2788 | */ | |
cc6167b4 | 2789 | pr_info_ratelimited( |
913cce5a | 2790 | "md/raid:%s: read error corrected (%lu sectors at %llu on %pg)\n", |
c911c46c | 2791 | mdname(conf->mddev), RAID5_STRIPE_SECTORS(conf), |
05616be5 | 2792 | (unsigned long long)s, |
913cce5a | 2793 | rdev->bdev); |
c911c46c | 2794 | atomic_add(RAID5_STRIPE_SECTORS(conf), &rdev->corrected_errors); |
4e5314b5 N |
2795 | clear_bit(R5_ReadError, &sh->dev[i].flags); |
2796 | clear_bit(R5_ReWrite, &sh->dev[i].flags); | |
3f9e7c14 | 2797 | } else if (test_bit(R5_ReadNoMerge, &sh->dev[i].flags)) |
2798 | clear_bit(R5_ReadNoMerge, &sh->dev[i].flags); | |
2799 | ||
86aa1397 SL |
2800 | if (test_bit(R5_InJournal, &sh->dev[i].flags)) |
2801 | /* | |
2802 | * end read for a page in journal, this | |
2803 | * must be preparing for prexor in rmw | |
2804 | */ | |
2805 | set_bit(R5_OrigPageUPTDODATE, &sh->dev[i].flags); | |
2806 | ||
14a75d3e N |
2807 | if (atomic_read(&rdev->read_errors)) |
2808 | atomic_set(&rdev->read_errors, 0); | |
1da177e4 | 2809 | } else { |
ba22dcbf | 2810 | int retry = 0; |
2e8ac303 | 2811 | int set_bad = 0; |
d6950432 | 2812 | |
1da177e4 | 2813 | clear_bit(R5_UPTODATE, &sh->dev[i].flags); |
b76b4715 NC |
2814 | if (!(bi->bi_status == BLK_STS_PROTECTION)) |
2815 | atomic_inc(&rdev->read_errors); | |
14a75d3e | 2816 | if (test_bit(R5_ReadRepl, &sh->dev[i].flags)) |
cc6167b4 | 2817 | pr_warn_ratelimited( |
913cce5a | 2818 | "md/raid:%s: read error on replacement device (sector %llu on %pg).\n", |
14a75d3e | 2819 | mdname(conf->mddev), |
05616be5 | 2820 | (unsigned long long)s, |
913cce5a | 2821 | rdev->bdev); |
2e8ac303 | 2822 | else if (conf->mddev->degraded >= conf->max_degraded) { |
2823 | set_bad = 1; | |
cc6167b4 | 2824 | pr_warn_ratelimited( |
913cce5a | 2825 | "md/raid:%s: read error not correctable (sector %llu on %pg).\n", |
8bda470e | 2826 | mdname(conf->mddev), |
05616be5 | 2827 | (unsigned long long)s, |
913cce5a | 2828 | rdev->bdev); |
2e8ac303 | 2829 | } else if (test_bit(R5_ReWrite, &sh->dev[i].flags)) { |
4e5314b5 | 2830 | /* Oh, no!!! */ |
2e8ac303 | 2831 | set_bad = 1; |
cc6167b4 | 2832 | pr_warn_ratelimited( |
913cce5a | 2833 | "md/raid:%s: read error NOT corrected!! (sector %llu on %pg).\n", |
8bda470e | 2834 | mdname(conf->mddev), |
05616be5 | 2835 | (unsigned long long)s, |
913cce5a | 2836 | rdev->bdev); |
2e8ac303 | 2837 | } else if (atomic_read(&rdev->read_errors) |
0009fad0 NC |
2838 | > conf->max_nr_stripes) { |
2839 | if (!test_bit(Faulty, &rdev->flags)) { | |
2840 | pr_warn("md/raid:%s: %d read_errors > %d stripes\n", | |
2841 | mdname(conf->mddev), | |
2842 | atomic_read(&rdev->read_errors), | |
2843 | conf->max_nr_stripes); | |
913cce5a CH |
2844 | pr_warn("md/raid:%s: Too many read errors, failing device %pg.\n", |
2845 | mdname(conf->mddev), rdev->bdev); | |
0009fad0 NC |
2846 | } |
2847 | } else | |
ba22dcbf | 2848 | retry = 1; |
edfa1f65 BY |
2849 | if (set_bad && test_bit(In_sync, &rdev->flags) |
2850 | && !test_bit(R5_ReadNoMerge, &sh->dev[i].flags)) | |
2851 | retry = 1; | |
ba22dcbf | 2852 | if (retry) |
143f6e73 XN |
2853 | if (sh->qd_idx >= 0 && sh->pd_idx == i) |
2854 | set_bit(R5_ReadError, &sh->dev[i].flags); | |
2855 | else if (test_bit(R5_ReadNoMerge, &sh->dev[i].flags)) { | |
3f9e7c14 | 2856 | set_bit(R5_ReadError, &sh->dev[i].flags); |
2857 | clear_bit(R5_ReadNoMerge, &sh->dev[i].flags); | |
2858 | } else | |
2859 | set_bit(R5_ReadNoMerge, &sh->dev[i].flags); | |
ba22dcbf | 2860 | else { |
4e5314b5 N |
2861 | clear_bit(R5_ReadError, &sh->dev[i].flags); |
2862 | clear_bit(R5_ReWrite, &sh->dev[i].flags); | |
2e8ac303 | 2863 | if (!(set_bad |
2864 | && test_bit(In_sync, &rdev->flags) | |
2865 | && rdev_set_badblocks( | |
c911c46c | 2866 | rdev, sh->sector, RAID5_STRIPE_SECTORS(conf), 0))) |
2e8ac303 | 2867 | md_error(conf->mddev, rdev); |
ba22dcbf | 2868 | } |
1da177e4 | 2869 | } |
14a75d3e | 2870 | rdev_dec_pending(rdev, conf->mddev); |
03a6b195 | 2871 | bio_uninit(bi); |
1da177e4 LT |
2872 | clear_bit(R5_LOCKED, &sh->dev[i].flags); |
2873 | set_bit(STRIPE_HANDLE, &sh->state); | |
6d036f7d | 2874 | raid5_release_stripe(sh); |
1da177e4 LT |
2875 | } |
2876 | ||
4246a0b6 | 2877 | static void raid5_end_write_request(struct bio *bi) |
1da177e4 | 2878 | { |
99c0fb5f | 2879 | struct stripe_head *sh = bi->bi_private; |
d1688a6d | 2880 | struct r5conf *conf = sh->raid_conf; |
7ecaa1e6 | 2881 | int disks = sh->disks, i; |
3f649ab7 | 2882 | struct md_rdev *rdev; |
b84db560 N |
2883 | sector_t first_bad; |
2884 | int bad_sectors; | |
977df362 | 2885 | int replacement = 0; |
1da177e4 | 2886 | |
977df362 N |
2887 | for (i = 0 ; i < disks; i++) { |
2888 | if (bi == &sh->dev[i].req) { | |
e38b0432 | 2889 | rdev = rdev_pend_deref(conf->disks[i].rdev); |
1da177e4 | 2890 | break; |
977df362 N |
2891 | } |
2892 | if (bi == &sh->dev[i].rreq) { | |
e38b0432 | 2893 | rdev = rdev_pend_deref(conf->disks[i].replacement); |
dd054fce N |
2894 | if (rdev) |
2895 | replacement = 1; | |
2896 | else | |
2897 | /* rdev was removed and 'replacement' | |
2898 | * replaced it. rdev is not removed | |
2899 | * until all requests are finished. | |
2900 | */ | |
e38b0432 | 2901 | rdev = rdev_pend_deref(conf->disks[i].rdev); |
977df362 N |
2902 | break; |
2903 | } | |
2904 | } | |
4246a0b6 | 2905 | pr_debug("end_write_request %llu/%d, count %d, error: %d.\n", |
1da177e4 | 2906 | (unsigned long long)sh->sector, i, atomic_read(&sh->count), |
4e4cbee9 | 2907 | bi->bi_status); |
1da177e4 LT |
2908 | if (i == disks) { |
2909 | BUG(); | |
6712ecf8 | 2910 | return; |
1da177e4 LT |
2911 | } |
2912 | ||
977df362 | 2913 | if (replacement) { |
4e4cbee9 | 2914 | if (bi->bi_status) |
977df362 N |
2915 | md_error(conf->mddev, rdev); |
2916 | else if (is_badblock(rdev, sh->sector, | |
c911c46c | 2917 | RAID5_STRIPE_SECTORS(conf), |
977df362 N |
2918 | &first_bad, &bad_sectors)) |
2919 | set_bit(R5_MadeGoodRepl, &sh->dev[i].flags); | |
2920 | } else { | |
4e4cbee9 | 2921 | if (bi->bi_status) { |
9f97e4b1 | 2922 | set_bit(STRIPE_DEGRADED, &sh->state); |
977df362 N |
2923 | set_bit(WriteErrorSeen, &rdev->flags); |
2924 | set_bit(R5_WriteError, &sh->dev[i].flags); | |
3a6de292 N |
2925 | if (!test_and_set_bit(WantReplacement, &rdev->flags)) |
2926 | set_bit(MD_RECOVERY_NEEDED, | |
2927 | &rdev->mddev->recovery); | |
977df362 | 2928 | } else if (is_badblock(rdev, sh->sector, |
c911c46c | 2929 | RAID5_STRIPE_SECTORS(conf), |
c0b32972 | 2930 | &first_bad, &bad_sectors)) { |
977df362 | 2931 | set_bit(R5_MadeGood, &sh->dev[i].flags); |
c0b32972 N |
2932 | if (test_bit(R5_ReadError, &sh->dev[i].flags)) |
2933 | /* That was a successful write so make | |
2934 | * sure it looks like we already did | |
2935 | * a re-write. | |
2936 | */ | |
2937 | set_bit(R5_ReWrite, &sh->dev[i].flags); | |
2938 | } | |
977df362 N |
2939 | } |
2940 | rdev_dec_pending(rdev, conf->mddev); | |
1da177e4 | 2941 | |
4e4cbee9 | 2942 | if (sh->batch_head && bi->bi_status && !replacement) |
72ac7330 | 2943 | set_bit(STRIPE_BATCH_ERR, &sh->batch_head->state); |
2944 | ||
03a6b195 | 2945 | bio_uninit(bi); |
977df362 N |
2946 | if (!test_and_clear_bit(R5_DOUBLE_LOCKED, &sh->dev[i].flags)) |
2947 | clear_bit(R5_LOCKED, &sh->dev[i].flags); | |
1da177e4 | 2948 | set_bit(STRIPE_HANDLE, &sh->state); |
59fc630b | 2949 | |
2950 | if (sh->batch_head && sh != sh->batch_head) | |
6d036f7d | 2951 | raid5_release_stripe(sh->batch_head); |
10421247 | 2952 | raid5_release_stripe(sh); |
1da177e4 LT |
2953 | } |
2954 | ||
849674e4 | 2955 | static void raid5_error(struct mddev *mddev, struct md_rdev *rdev) |
1da177e4 | 2956 | { |
d1688a6d | 2957 | struct r5conf *conf = mddev->private; |
908f4fbd | 2958 | unsigned long flags; |
0c55e022 | 2959 | pr_debug("raid456: error called\n"); |
1da177e4 | 2960 | |
913cce5a CH |
2961 | pr_crit("md/raid:%s: Disk failure on %pg, disabling device.\n", |
2962 | mdname(mddev), rdev->bdev); | |
57668f0a | 2963 | |
908f4fbd | 2964 | spin_lock_irqsave(&conf->device_lock, flags); |
57668f0a MT |
2965 | set_bit(Faulty, &rdev->flags); |
2966 | clear_bit(In_sync, &rdev->flags); | |
2967 | mddev->degraded = raid5_calc_degraded(conf); | |
fb73b357 | 2968 | |
57668f0a MT |
2969 | if (has_failed(conf)) { |
2970 | set_bit(MD_BROKEN, &conf->mddev->flags); | |
fb73b357 | 2971 | conf->recovery_disabled = mddev->recovery_disabled; |
57668f0a MT |
2972 | |
2973 | pr_crit("md/raid:%s: Cannot continue operation (%d/%d failed).\n", | |
2974 | mdname(mddev), mddev->degraded, conf->raid_disks); | |
2975 | } else { | |
2976 | pr_crit("md/raid:%s: Operation continuing on %d devices.\n", | |
2977 | mdname(mddev), conf->raid_disks - mddev->degraded); | |
fb73b357 MT |
2978 | } |
2979 | ||
908f4fbd N |
2980 | spin_unlock_irqrestore(&conf->device_lock, flags); |
2981 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); | |
2982 | ||
de393cde | 2983 | set_bit(Blocked, &rdev->flags); |
2953079c SL |
2984 | set_mask_bits(&mddev->sb_flags, 0, |
2985 | BIT(MD_SB_CHANGE_DEVS) | BIT(MD_SB_CHANGE_PENDING)); | |
70d466f7 | 2986 | r5c_update_on_rdev_error(mddev, rdev); |
16a53ecc | 2987 | } |
1da177e4 LT |
2988 | |
2989 | /* | |
2990 | * Input: a 'big' sector number, | |
2991 | * Output: index of the data and parity disk, and the sector # in them. | |
2992 | */ | |
6d036f7d SL |
2993 | sector_t raid5_compute_sector(struct r5conf *conf, sector_t r_sector, |
2994 | int previous, int *dd_idx, | |
2995 | struct stripe_head *sh) | |
1da177e4 | 2996 | { |
6e3b96ed | 2997 | sector_t stripe, stripe2; |
35f2a591 | 2998 | sector_t chunk_number; |
1da177e4 | 2999 | unsigned int chunk_offset; |
911d4ee8 | 3000 | int pd_idx, qd_idx; |
67cc2b81 | 3001 | int ddf_layout = 0; |
1da177e4 | 3002 | sector_t new_sector; |
e183eaed N |
3003 | int algorithm = previous ? conf->prev_algo |
3004 | : conf->algorithm; | |
09c9e5fa AN |
3005 | int sectors_per_chunk = previous ? conf->prev_chunk_sectors |
3006 | : conf->chunk_sectors; | |
112bf897 N |
3007 | int raid_disks = previous ? conf->previous_raid_disks |
3008 | : conf->raid_disks; | |
3009 | int data_disks = raid_disks - conf->max_degraded; | |
1da177e4 LT |
3010 | |
3011 | /* First compute the information on this sector */ | |
3012 | ||
3013 | /* | |
3014 | * Compute the chunk number and the sector offset inside the chunk | |
3015 | */ | |
3016 | chunk_offset = sector_div(r_sector, sectors_per_chunk); | |
3017 | chunk_number = r_sector; | |
1da177e4 LT |
3018 | |
3019 | /* | |
3020 | * Compute the stripe number | |
3021 | */ | |
35f2a591 N |
3022 | stripe = chunk_number; |
3023 | *dd_idx = sector_div(stripe, data_disks); | |
6e3b96ed | 3024 | stripe2 = stripe; |
1da177e4 LT |
3025 | /* |
3026 | * Select the parity disk based on the user selected algorithm. | |
3027 | */ | |
84789554 | 3028 | pd_idx = qd_idx = -1; |
16a53ecc N |
3029 | switch(conf->level) { |
3030 | case 4: | |
911d4ee8 | 3031 | pd_idx = data_disks; |
16a53ecc N |
3032 | break; |
3033 | case 5: | |
e183eaed | 3034 | switch (algorithm) { |
1da177e4 | 3035 | case ALGORITHM_LEFT_ASYMMETRIC: |
6e3b96ed | 3036 | pd_idx = data_disks - sector_div(stripe2, raid_disks); |
911d4ee8 | 3037 | if (*dd_idx >= pd_idx) |
1da177e4 LT |
3038 | (*dd_idx)++; |
3039 | break; | |
3040 | case ALGORITHM_RIGHT_ASYMMETRIC: | |
6e3b96ed | 3041 | pd_idx = sector_div(stripe2, raid_disks); |
911d4ee8 | 3042 | if (*dd_idx >= pd_idx) |
1da177e4 LT |
3043 | (*dd_idx)++; |
3044 | break; | |
3045 | case ALGORITHM_LEFT_SYMMETRIC: | |
6e3b96ed | 3046 | pd_idx = data_disks - sector_div(stripe2, raid_disks); |
911d4ee8 | 3047 | *dd_idx = (pd_idx + 1 + *dd_idx) % raid_disks; |
1da177e4 LT |
3048 | break; |
3049 | case ALGORITHM_RIGHT_SYMMETRIC: | |
6e3b96ed | 3050 | pd_idx = sector_div(stripe2, raid_disks); |
911d4ee8 | 3051 | *dd_idx = (pd_idx + 1 + *dd_idx) % raid_disks; |
1da177e4 | 3052 | break; |
99c0fb5f N |
3053 | case ALGORITHM_PARITY_0: |
3054 | pd_idx = 0; | |
3055 | (*dd_idx)++; | |
3056 | break; | |
3057 | case ALGORITHM_PARITY_N: | |
3058 | pd_idx = data_disks; | |
3059 | break; | |
1da177e4 | 3060 | default: |
99c0fb5f | 3061 | BUG(); |
16a53ecc N |
3062 | } |
3063 | break; | |
3064 | case 6: | |
3065 | ||
e183eaed | 3066 | switch (algorithm) { |
16a53ecc | 3067 | case ALGORITHM_LEFT_ASYMMETRIC: |
6e3b96ed | 3068 | pd_idx = raid_disks - 1 - sector_div(stripe2, raid_disks); |
911d4ee8 N |
3069 | qd_idx = pd_idx + 1; |
3070 | if (pd_idx == raid_disks-1) { | |
99c0fb5f | 3071 | (*dd_idx)++; /* Q D D D P */ |
911d4ee8 N |
3072 | qd_idx = 0; |
3073 | } else if (*dd_idx >= pd_idx) | |
16a53ecc N |
3074 | (*dd_idx) += 2; /* D D P Q D */ |
3075 | break; | |
3076 | case ALGORITHM_RIGHT_ASYMMETRIC: | |
6e3b96ed | 3077 | pd_idx = sector_div(stripe2, raid_disks); |
911d4ee8 N |
3078 | qd_idx = pd_idx + 1; |
3079 | if (pd_idx == raid_disks-1) { | |
99c0fb5f | 3080 | (*dd_idx)++; /* Q D D D P */ |
911d4ee8 N |
3081 | qd_idx = 0; |
3082 | } else if (*dd_idx >= pd_idx) | |
16a53ecc N |
3083 | (*dd_idx) += 2; /* D D P Q D */ |
3084 | break; | |
3085 | case ALGORITHM_LEFT_SYMMETRIC: | |
6e3b96ed | 3086 | pd_idx = raid_disks - 1 - sector_div(stripe2, raid_disks); |
911d4ee8 N |
3087 | qd_idx = (pd_idx + 1) % raid_disks; |
3088 | *dd_idx = (pd_idx + 2 + *dd_idx) % raid_disks; | |
16a53ecc N |
3089 | break; |
3090 | case ALGORITHM_RIGHT_SYMMETRIC: | |
6e3b96ed | 3091 | pd_idx = sector_div(stripe2, raid_disks); |
911d4ee8 N |
3092 | qd_idx = (pd_idx + 1) % raid_disks; |
3093 | *dd_idx = (pd_idx + 2 + *dd_idx) % raid_disks; | |
16a53ecc | 3094 | break; |
99c0fb5f N |
3095 | |
3096 | case ALGORITHM_PARITY_0: | |
3097 | pd_idx = 0; | |
3098 | qd_idx = 1; | |
3099 | (*dd_idx) += 2; | |
3100 | break; | |
3101 | case ALGORITHM_PARITY_N: | |
3102 | pd_idx = data_disks; | |
3103 | qd_idx = data_disks + 1; | |
3104 | break; | |
3105 | ||
3106 | case ALGORITHM_ROTATING_ZERO_RESTART: | |
3107 | /* Exactly the same as RIGHT_ASYMMETRIC, but or | |
3108 | * of blocks for computing Q is different. | |
3109 | */ | |
6e3b96ed | 3110 | pd_idx = sector_div(stripe2, raid_disks); |
99c0fb5f N |
3111 | qd_idx = pd_idx + 1; |
3112 | if (pd_idx == raid_disks-1) { | |
3113 | (*dd_idx)++; /* Q D D D P */ | |
3114 | qd_idx = 0; | |
3115 | } else if (*dd_idx >= pd_idx) | |
3116 | (*dd_idx) += 2; /* D D P Q D */ | |
67cc2b81 | 3117 | ddf_layout = 1; |
99c0fb5f N |
3118 | break; |
3119 | ||
3120 | case ALGORITHM_ROTATING_N_RESTART: | |
3121 | /* Same a left_asymmetric, by first stripe is | |
3122 | * D D D P Q rather than | |
3123 | * Q D D D P | |
3124 | */ | |
6e3b96ed N |
3125 | stripe2 += 1; |
3126 | pd_idx = raid_disks - 1 - sector_div(stripe2, raid_disks); | |
99c0fb5f N |
3127 | qd_idx = pd_idx + 1; |
3128 | if (pd_idx == raid_disks-1) { | |
3129 | (*dd_idx)++; /* Q D D D P */ | |
3130 | qd_idx = 0; | |
3131 | } else if (*dd_idx >= pd_idx) | |
3132 | (*dd_idx) += 2; /* D D P Q D */ | |
67cc2b81 | 3133 | ddf_layout = 1; |
99c0fb5f N |
3134 | break; |
3135 | ||
3136 | case ALGORITHM_ROTATING_N_CONTINUE: | |
3137 | /* Same as left_symmetric but Q is before P */ | |
6e3b96ed | 3138 | pd_idx = raid_disks - 1 - sector_div(stripe2, raid_disks); |
99c0fb5f N |
3139 | qd_idx = (pd_idx + raid_disks - 1) % raid_disks; |
3140 | *dd_idx = (pd_idx + 1 + *dd_idx) % raid_disks; | |
67cc2b81 | 3141 | ddf_layout = 1; |
99c0fb5f N |
3142 | break; |
3143 | ||
3144 | case ALGORITHM_LEFT_ASYMMETRIC_6: | |
3145 | /* RAID5 left_asymmetric, with Q on last device */ | |
6e3b96ed | 3146 | pd_idx = data_disks - sector_div(stripe2, raid_disks-1); |
99c0fb5f N |
3147 | if (*dd_idx >= pd_idx) |
3148 | (*dd_idx)++; | |
3149 | qd_idx = raid_disks - 1; | |
3150 | break; | |
3151 | ||
3152 | case ALGORITHM_RIGHT_ASYMMETRIC_6: | |
6e3b96ed | 3153 | pd_idx = sector_div(stripe2, raid_disks-1); |
99c0fb5f N |
3154 | if (*dd_idx >= pd_idx) |
3155 | (*dd_idx)++; | |
3156 | qd_idx = raid_disks - 1; | |
3157 | break; | |
3158 | ||
3159 | case ALGORITHM_LEFT_SYMMETRIC_6: | |
6e3b96ed | 3160 | pd_idx = data_disks - sector_div(stripe2, raid_disks-1); |
99c0fb5f N |
3161 | *dd_idx = (pd_idx + 1 + *dd_idx) % (raid_disks-1); |
3162 | qd_idx = raid_disks - 1; | |
3163 | break; | |
3164 | ||
3165 | case ALGORITHM_RIGHT_SYMMETRIC_6: | |
6e3b96ed | 3166 | pd_idx = sector_div(stripe2, raid_disks-1); |
99c0fb5f N |
3167 | *dd_idx = (pd_idx + 1 + *dd_idx) % (raid_disks-1); |
3168 | qd_idx = raid_disks - 1; | |
3169 | break; | |
3170 | ||
3171 | case ALGORITHM_PARITY_0_6: | |
3172 | pd_idx = 0; | |
3173 | (*dd_idx)++; | |
3174 | qd_idx = raid_disks - 1; | |
3175 | break; | |
3176 | ||
16a53ecc | 3177 | default: |
99c0fb5f | 3178 | BUG(); |
16a53ecc N |
3179 | } |
3180 | break; | |
1da177e4 LT |
3181 | } |
3182 | ||
911d4ee8 N |
3183 | if (sh) { |
3184 | sh->pd_idx = pd_idx; | |
3185 | sh->qd_idx = qd_idx; | |
67cc2b81 | 3186 | sh->ddf_layout = ddf_layout; |
911d4ee8 | 3187 | } |
1da177e4 LT |
3188 | /* |
3189 | * Finally, compute the new sector number | |
3190 | */ | |
3191 | new_sector = (sector_t)stripe * sectors_per_chunk + chunk_offset; | |
3192 | return new_sector; | |
3193 | } | |
3194 | ||
6d036f7d | 3195 | sector_t raid5_compute_blocknr(struct stripe_head *sh, int i, int previous) |
1da177e4 | 3196 | { |
d1688a6d | 3197 | struct r5conf *conf = sh->raid_conf; |
b875e531 N |
3198 | int raid_disks = sh->disks; |
3199 | int data_disks = raid_disks - conf->max_degraded; | |
1da177e4 | 3200 | sector_t new_sector = sh->sector, check; |
09c9e5fa AN |
3201 | int sectors_per_chunk = previous ? conf->prev_chunk_sectors |
3202 | : conf->chunk_sectors; | |
e183eaed N |
3203 | int algorithm = previous ? conf->prev_algo |
3204 | : conf->algorithm; | |
1da177e4 LT |
3205 | sector_t stripe; |
3206 | int chunk_offset; | |
35f2a591 N |
3207 | sector_t chunk_number; |
3208 | int dummy1, dd_idx = i; | |
1da177e4 | 3209 | sector_t r_sector; |
911d4ee8 | 3210 | struct stripe_head sh2; |
1da177e4 LT |
3211 | |
3212 | chunk_offset = sector_div(new_sector, sectors_per_chunk); | |
3213 | stripe = new_sector; | |
1da177e4 | 3214 | |
16a53ecc N |
3215 | if (i == sh->pd_idx) |
3216 | return 0; | |
3217 | switch(conf->level) { | |
3218 | case 4: break; | |
3219 | case 5: | |
e183eaed | 3220 | switch (algorithm) { |
1da177e4 LT |
3221 | case ALGORITHM_LEFT_ASYMMETRIC: |
3222 | case ALGORITHM_RIGHT_ASYMMETRIC: | |
3223 | if (i > sh->pd_idx) | |
3224 | i--; | |
3225 | break; | |
3226 | case ALGORITHM_LEFT_SYMMETRIC: | |
3227 | case ALGORITHM_RIGHT_SYMMETRIC: | |
3228 | if (i < sh->pd_idx) | |
3229 | i += raid_disks; | |
3230 | i -= (sh->pd_idx + 1); | |
3231 | break; | |
99c0fb5f N |
3232 | case ALGORITHM_PARITY_0: |
3233 | i -= 1; | |
3234 | break; | |
3235 | case ALGORITHM_PARITY_N: | |
3236 | break; | |
1da177e4 | 3237 | default: |
99c0fb5f | 3238 | BUG(); |
16a53ecc N |
3239 | } |
3240 | break; | |
3241 | case 6: | |
d0dabf7e | 3242 | if (i == sh->qd_idx) |
16a53ecc | 3243 | return 0; /* It is the Q disk */ |
e183eaed | 3244 | switch (algorithm) { |
16a53ecc N |
3245 | case ALGORITHM_LEFT_ASYMMETRIC: |
3246 | case ALGORITHM_RIGHT_ASYMMETRIC: | |
99c0fb5f N |
3247 | case ALGORITHM_ROTATING_ZERO_RESTART: |
3248 | case ALGORITHM_ROTATING_N_RESTART: | |
3249 | if (sh->pd_idx == raid_disks-1) | |
3250 | i--; /* Q D D D P */ | |
16a53ecc N |
3251 | else if (i > sh->pd_idx) |
3252 | i -= 2; /* D D P Q D */ | |
3253 | break; | |
3254 | case ALGORITHM_LEFT_SYMMETRIC: | |
3255 | case ALGORITHM_RIGHT_SYMMETRIC: | |
3256 | if (sh->pd_idx == raid_disks-1) | |
3257 | i--; /* Q D D D P */ | |
3258 | else { | |
3259 | /* D D P Q D */ | |
3260 | if (i < sh->pd_idx) | |
3261 | i += raid_disks; | |
3262 | i -= (sh->pd_idx + 2); | |
3263 | } | |
3264 | break; | |
99c0fb5f N |
3265 | case ALGORITHM_PARITY_0: |
3266 | i -= 2; | |
3267 | break; | |
3268 | case ALGORITHM_PARITY_N: | |
3269 | break; | |
3270 | case ALGORITHM_ROTATING_N_CONTINUE: | |
e4424fee | 3271 | /* Like left_symmetric, but P is before Q */ |
99c0fb5f N |
3272 | if (sh->pd_idx == 0) |
3273 | i--; /* P D D D Q */ | |
e4424fee N |
3274 | else { |
3275 | /* D D Q P D */ | |
3276 | if (i < sh->pd_idx) | |
3277 | i += raid_disks; | |
3278 | i -= (sh->pd_idx + 1); | |
3279 | } | |
99c0fb5f N |
3280 | break; |
3281 | case ALGORITHM_LEFT_ASYMMETRIC_6: | |
3282 | case ALGORITHM_RIGHT_ASYMMETRIC_6: | |
3283 | if (i > sh->pd_idx) | |
3284 | i--; | |
3285 | break; | |
3286 | case ALGORITHM_LEFT_SYMMETRIC_6: | |
3287 | case ALGORITHM_RIGHT_SYMMETRIC_6: | |
3288 | if (i < sh->pd_idx) | |
3289 | i += data_disks + 1; | |
3290 | i -= (sh->pd_idx + 1); | |
3291 | break; | |
3292 | case ALGORITHM_PARITY_0_6: | |
3293 | i -= 1; | |
3294 | break; | |
16a53ecc | 3295 | default: |
99c0fb5f | 3296 | BUG(); |
16a53ecc N |
3297 | } |
3298 | break; | |
1da177e4 LT |
3299 | } |
3300 | ||
3301 | chunk_number = stripe * data_disks + i; | |
35f2a591 | 3302 | r_sector = chunk_number * sectors_per_chunk + chunk_offset; |
1da177e4 | 3303 | |
112bf897 | 3304 | check = raid5_compute_sector(conf, r_sector, |
784052ec | 3305 | previous, &dummy1, &sh2); |
911d4ee8 N |
3306 | if (check != sh->sector || dummy1 != dd_idx || sh2.pd_idx != sh->pd_idx |
3307 | || sh2.qd_idx != sh->qd_idx) { | |
cc6167b4 N |
3308 | pr_warn("md/raid:%s: compute_blocknr: map not correct\n", |
3309 | mdname(conf->mddev)); | |
1da177e4 LT |
3310 | return 0; |
3311 | } | |
3312 | return r_sector; | |
3313 | } | |
3314 | ||
07e83364 SL |
3315 | /* |
3316 | * There are cases where we want handle_stripe_dirtying() and | |
3317 | * schedule_reconstruction() to delay towrite to some dev of a stripe. | |
3318 | * | |
3319 | * This function checks whether we want to delay the towrite. Specifically, | |
3320 | * we delay the towrite when: | |
3321 | * | |
3322 | * 1. degraded stripe has a non-overwrite to the missing dev, AND this | |
3323 | * stripe has data in journal (for other devices). | |
3324 | * | |
3325 | * In this case, when reading data for the non-overwrite dev, it is | |
3326 | * necessary to handle complex rmw of write back cache (prexor with | |
3327 | * orig_page, and xor with page). To keep read path simple, we would | |
3328 | * like to flush data in journal to RAID disks first, so complex rmw | |
3329 | * is handled in the write patch (handle_stripe_dirtying). | |
3330 | * | |
39b99586 SL |
3331 | * 2. when journal space is critical (R5C_LOG_CRITICAL=1) |
3332 | * | |
3333 | * It is important to be able to flush all stripes in raid5-cache. | |
3334 | * Therefore, we need reserve some space on the journal device for | |
3335 | * these flushes. If flush operation includes pending writes to the | |
3336 | * stripe, we need to reserve (conf->raid_disk + 1) pages per stripe | |
3337 | * for the flush out. If we exclude these pending writes from flush | |
3338 | * operation, we only need (conf->max_degraded + 1) pages per stripe. | |
3339 | * Therefore, excluding pending writes in these cases enables more | |
3340 | * efficient use of the journal device. | |
3341 | * | |
3342 | * Note: To make sure the stripe makes progress, we only delay | |
3343 | * towrite for stripes with data already in journal (injournal > 0). | |
3344 | * When LOG_CRITICAL, stripes with injournal == 0 will be sent to | |
3345 | * no_space_stripes list. | |
3346 | * | |
70d466f7 SL |
3347 | * 3. during journal failure |
3348 | * In journal failure, we try to flush all cached data to raid disks | |
3349 | * based on data in stripe cache. The array is read-only to upper | |
3350 | * layers, so we would skip all pending writes. | |
3351 | * | |
07e83364 | 3352 | */ |
39b99586 SL |
3353 | static inline bool delay_towrite(struct r5conf *conf, |
3354 | struct r5dev *dev, | |
3355 | struct stripe_head_state *s) | |
07e83364 | 3356 | { |
39b99586 SL |
3357 | /* case 1 above */ |
3358 | if (!test_bit(R5_OVERWRITE, &dev->flags) && | |
3359 | !test_bit(R5_Insync, &dev->flags) && s->injournal) | |
3360 | return true; | |
3361 | /* case 2 above */ | |
3362 | if (test_bit(R5C_LOG_CRITICAL, &conf->cache_state) && | |
3363 | s->injournal > 0) | |
3364 | return true; | |
70d466f7 SL |
3365 | /* case 3 above */ |
3366 | if (s->log_failed && s->injournal) | |
3367 | return true; | |
39b99586 | 3368 | return false; |
07e83364 SL |
3369 | } |
3370 | ||
600aa109 | 3371 | static void |
c0f7bddb | 3372 | schedule_reconstruction(struct stripe_head *sh, struct stripe_head_state *s, |
600aa109 | 3373 | int rcw, int expand) |
e33129d8 | 3374 | { |
584acdd4 | 3375 | int i, pd_idx = sh->pd_idx, qd_idx = sh->qd_idx, disks = sh->disks; |
d1688a6d | 3376 | struct r5conf *conf = sh->raid_conf; |
c0f7bddb | 3377 | int level = conf->level; |
e33129d8 DW |
3378 | |
3379 | if (rcw) { | |
1e6d690b SL |
3380 | /* |
3381 | * In some cases, handle_stripe_dirtying initially decided to | |
3382 | * run rmw and allocates extra page for prexor. However, rcw is | |
3383 | * cheaper later on. We need to free the extra page now, | |
3384 | * because we won't be able to do that in ops_complete_prexor(). | |
3385 | */ | |
3386 | r5c_release_extra_page(sh); | |
e33129d8 DW |
3387 | |
3388 | for (i = disks; i--; ) { | |
3389 | struct r5dev *dev = &sh->dev[i]; | |
3390 | ||
39b99586 | 3391 | if (dev->towrite && !delay_towrite(conf, dev, s)) { |
e33129d8 | 3392 | set_bit(R5_LOCKED, &dev->flags); |
d8ee0728 | 3393 | set_bit(R5_Wantdrain, &dev->flags); |
e33129d8 DW |
3394 | if (!expand) |
3395 | clear_bit(R5_UPTODATE, &dev->flags); | |
600aa109 | 3396 | s->locked++; |
1e6d690b SL |
3397 | } else if (test_bit(R5_InJournal, &dev->flags)) { |
3398 | set_bit(R5_LOCKED, &dev->flags); | |
3399 | s->locked++; | |
e33129d8 DW |
3400 | } |
3401 | } | |
ce7d363a N |
3402 | /* if we are not expanding this is a proper write request, and |
3403 | * there will be bios with new data to be drained into the | |
3404 | * stripe cache | |
3405 | */ | |
3406 | if (!expand) { | |
3407 | if (!s->locked) | |
3408 | /* False alarm, nothing to do */ | |
3409 | return; | |
3410 | sh->reconstruct_state = reconstruct_state_drain_run; | |
3411 | set_bit(STRIPE_OP_BIODRAIN, &s->ops_request); | |
3412 | } else | |
3413 | sh->reconstruct_state = reconstruct_state_run; | |
3414 | ||
3415 | set_bit(STRIPE_OP_RECONSTRUCT, &s->ops_request); | |
3416 | ||
c0f7bddb | 3417 | if (s->locked + conf->max_degraded == disks) |
8b3e6cdc | 3418 | if (!test_and_set_bit(STRIPE_FULL_WRITE, &sh->state)) |
c0f7bddb | 3419 | atomic_inc(&conf->pending_full_writes); |
e33129d8 DW |
3420 | } else { |
3421 | BUG_ON(!(test_bit(R5_UPTODATE, &sh->dev[pd_idx].flags) || | |
3422 | test_bit(R5_Wantcompute, &sh->dev[pd_idx].flags))); | |
584acdd4 MS |
3423 | BUG_ON(level == 6 && |
3424 | (!(test_bit(R5_UPTODATE, &sh->dev[qd_idx].flags) || | |
3425 | test_bit(R5_Wantcompute, &sh->dev[qd_idx].flags)))); | |
e33129d8 | 3426 | |
e33129d8 DW |
3427 | for (i = disks; i--; ) { |
3428 | struct r5dev *dev = &sh->dev[i]; | |
584acdd4 | 3429 | if (i == pd_idx || i == qd_idx) |
e33129d8 DW |
3430 | continue; |
3431 | ||
e33129d8 DW |
3432 | if (dev->towrite && |
3433 | (test_bit(R5_UPTODATE, &dev->flags) || | |
d8ee0728 DW |
3434 | test_bit(R5_Wantcompute, &dev->flags))) { |
3435 | set_bit(R5_Wantdrain, &dev->flags); | |
e33129d8 DW |
3436 | set_bit(R5_LOCKED, &dev->flags); |
3437 | clear_bit(R5_UPTODATE, &dev->flags); | |
600aa109 | 3438 | s->locked++; |
1e6d690b SL |
3439 | } else if (test_bit(R5_InJournal, &dev->flags)) { |
3440 | set_bit(R5_LOCKED, &dev->flags); | |
3441 | s->locked++; | |
e33129d8 DW |
3442 | } |
3443 | } | |
ce7d363a N |
3444 | if (!s->locked) |
3445 | /* False alarm - nothing to do */ | |
3446 | return; | |
3447 | sh->reconstruct_state = reconstruct_state_prexor_drain_run; | |
3448 | set_bit(STRIPE_OP_PREXOR, &s->ops_request); | |
3449 | set_bit(STRIPE_OP_BIODRAIN, &s->ops_request); | |
3450 | set_bit(STRIPE_OP_RECONSTRUCT, &s->ops_request); | |
e33129d8 DW |
3451 | } |
3452 | ||
c0f7bddb | 3453 | /* keep the parity disk(s) locked while asynchronous operations |
e33129d8 DW |
3454 | * are in flight |
3455 | */ | |
3456 | set_bit(R5_LOCKED, &sh->dev[pd_idx].flags); | |
3457 | clear_bit(R5_UPTODATE, &sh->dev[pd_idx].flags); | |
600aa109 | 3458 | s->locked++; |
e33129d8 | 3459 | |
c0f7bddb YT |
3460 | if (level == 6) { |
3461 | int qd_idx = sh->qd_idx; | |
3462 | struct r5dev *dev = &sh->dev[qd_idx]; | |
3463 | ||
3464 | set_bit(R5_LOCKED, &dev->flags); | |
3465 | clear_bit(R5_UPTODATE, &dev->flags); | |
3466 | s->locked++; | |
3467 | } | |
3468 | ||
845b9e22 | 3469 | if (raid5_has_ppl(sh->raid_conf) && sh->ppl_page && |
3418d036 AP |
3470 | test_bit(STRIPE_OP_BIODRAIN, &s->ops_request) && |
3471 | !test_bit(STRIPE_FULL_WRITE, &sh->state) && | |
3472 | test_bit(R5_Insync, &sh->dev[pd_idx].flags)) | |
3473 | set_bit(STRIPE_OP_PARTIAL_PARITY, &s->ops_request); | |
3474 | ||
600aa109 | 3475 | pr_debug("%s: stripe %llu locked: %d ops_request: %lx\n", |
e46b272b | 3476 | __func__, (unsigned long long)sh->sector, |
600aa109 | 3477 | s->locked, s->ops_request); |
e33129d8 | 3478 | } |
16a53ecc | 3479 | |
4ad1d984 LG |
3480 | static bool stripe_bio_overlaps(struct stripe_head *sh, struct bio *bi, |
3481 | int dd_idx, int forwrite) | |
1da177e4 | 3482 | { |
d1688a6d | 3483 | struct r5conf *conf = sh->raid_conf; |
4ad1d984 | 3484 | struct bio **bip; |
1da177e4 | 3485 | |
4ad1d984 LG |
3486 | pr_debug("checking bi b#%llu to stripe s#%llu\n", |
3487 | bi->bi_iter.bi_sector, sh->sector); | |
1da177e4 | 3488 | |
59fc630b | 3489 | /* Don't allow new IO added to stripes in batch list */ |
3490 | if (sh->batch_head) | |
4ad1d984 LG |
3491 | return true; |
3492 | ||
3493 | if (forwrite) | |
1da177e4 | 3494 | bip = &sh->dev[dd_idx].towrite; |
4ad1d984 | 3495 | else |
1da177e4 | 3496 | bip = &sh->dev[dd_idx].toread; |
4ad1d984 | 3497 | |
4f024f37 KO |
3498 | while (*bip && (*bip)->bi_iter.bi_sector < bi->bi_iter.bi_sector) { |
3499 | if (bio_end_sector(*bip) > bi->bi_iter.bi_sector) | |
4ad1d984 LG |
3500 | return true; |
3501 | bip = &(*bip)->bi_next; | |
1da177e4 | 3502 | } |
4ad1d984 | 3503 | |
4f024f37 | 3504 | if (*bip && (*bip)->bi_iter.bi_sector < bio_end_sector(bi)) |
4ad1d984 | 3505 | return true; |
1da177e4 | 3506 | |
3418d036 AP |
3507 | if (forwrite && raid5_has_ppl(conf)) { |
3508 | /* | |
3509 | * With PPL only writes to consecutive data chunks within a | |
3510 | * stripe are allowed because for a single stripe_head we can | |
3511 | * only have one PPL entry at a time, which describes one data | |
3512 | * range. Not really an overlap, but wait_for_overlap can be | |
3513 | * used to handle this. | |
3514 | */ | |
3515 | sector_t sector; | |
3516 | sector_t first = 0; | |
3517 | sector_t last = 0; | |
3518 | int count = 0; | |
3519 | int i; | |
3520 | ||
3521 | for (i = 0; i < sh->disks; i++) { | |
3522 | if (i != sh->pd_idx && | |
3523 | (i == dd_idx || sh->dev[i].towrite)) { | |
3524 | sector = sh->dev[i].sector; | |
3525 | if (count == 0 || sector < first) | |
3526 | first = sector; | |
3527 | if (sector > last) | |
3528 | last = sector; | |
3529 | count++; | |
3530 | } | |
3531 | } | |
3532 | ||
3533 | if (first + conf->chunk_sectors * (count - 1) != last) | |
4ad1d984 LG |
3534 | return true; |
3535 | } | |
3536 | ||
3537 | return false; | |
3538 | } | |
3539 | ||
3540 | static void __add_stripe_bio(struct stripe_head *sh, struct bio *bi, | |
3541 | int dd_idx, int forwrite, int previous) | |
3542 | { | |
3543 | struct r5conf *conf = sh->raid_conf; | |
3544 | struct bio **bip; | |
3545 | int firstwrite = 0; | |
3546 | ||
3547 | if (forwrite) { | |
3548 | bip = &sh->dev[dd_idx].towrite; | |
3549 | if (!*bip) | |
3550 | firstwrite = 1; | |
3551 | } else { | |
3552 | bip = &sh->dev[dd_idx].toread; | |
3418d036 AP |
3553 | } |
3554 | ||
4ad1d984 LG |
3555 | while (*bip && (*bip)->bi_iter.bi_sector < bi->bi_iter.bi_sector) |
3556 | bip = &(*bip)->bi_next; | |
3557 | ||
da41ba65 | 3558 | if (!forwrite || previous) |
3559 | clear_bit(STRIPE_BATCH_READY, &sh->state); | |
3560 | ||
78bafebd | 3561 | BUG_ON(*bip && bi->bi_next && (*bip) != bi->bi_next); |
1da177e4 LT |
3562 | if (*bip) |
3563 | bi->bi_next = *bip; | |
3564 | *bip = bi; | |
016c76ac | 3565 | bio_inc_remaining(bi); |
49728050 | 3566 | md_write_inc(conf->mddev, bi); |
72626685 | 3567 | |
1da177e4 LT |
3568 | if (forwrite) { |
3569 | /* check if page is covered */ | |
3570 | sector_t sector = sh->dev[dd_idx].sector; | |
3571 | for (bi=sh->dev[dd_idx].towrite; | |
c911c46c | 3572 | sector < sh->dev[dd_idx].sector + RAID5_STRIPE_SECTORS(conf) && |
4f024f37 | 3573 | bi && bi->bi_iter.bi_sector <= sector; |
c911c46c | 3574 | bi = r5_next_bio(conf, bi, sh->dev[dd_idx].sector)) { |
f73a1c7d KO |
3575 | if (bio_end_sector(bi) >= sector) |
3576 | sector = bio_end_sector(bi); | |
1da177e4 | 3577 | } |
c911c46c | 3578 | if (sector >= sh->dev[dd_idx].sector + RAID5_STRIPE_SECTORS(conf)) |
7a87f434 | 3579 | if (!test_and_set_bit(R5_OVERWRITE, &sh->dev[dd_idx].flags)) |
3580 | sh->overwrite_disks++; | |
1da177e4 | 3581 | } |
cbe47ec5 | 3582 | |
df1b620a LG |
3583 | pr_debug("added bi b#%llu to stripe s#%llu, disk %d, logical %llu\n", |
3584 | (*bip)->bi_iter.bi_sector, sh->sector, dd_idx, | |
3585 | sh->dev[dd_idx].sector); | |
cbe47ec5 N |
3586 | |
3587 | if (conf->mddev->bitmap && firstwrite) { | |
d0852df5 N |
3588 | /* Cannot hold spinlock over bitmap_startwrite, |
3589 | * but must ensure this isn't added to a batch until | |
3590 | * we have added to the bitmap and set bm_seq. | |
3591 | * So set STRIPE_BITMAP_PENDING to prevent | |
3592 | * batching. | |
4ad1d984 | 3593 | * If multiple __add_stripe_bio() calls race here they |
d0852df5 N |
3594 | * much all set STRIPE_BITMAP_PENDING. So only the first one |
3595 | * to complete "bitmap_startwrite" gets to set | |
3596 | * STRIPE_BIT_DELAY. This is important as once a stripe | |
3597 | * is added to a batch, STRIPE_BIT_DELAY cannot be changed | |
3598 | * any more. | |
3599 | */ | |
3600 | set_bit(STRIPE_BITMAP_PENDING, &sh->state); | |
3601 | spin_unlock_irq(&sh->stripe_lock); | |
e64e4018 | 3602 | md_bitmap_startwrite(conf->mddev->bitmap, sh->sector, |
c911c46c | 3603 | RAID5_STRIPE_SECTORS(conf), 0); |
d0852df5 N |
3604 | spin_lock_irq(&sh->stripe_lock); |
3605 | clear_bit(STRIPE_BITMAP_PENDING, &sh->state); | |
3606 | if (!sh->batch_head) { | |
3607 | sh->bm_seq = conf->seq_flush+1; | |
3608 | set_bit(STRIPE_BIT_DELAY, &sh->state); | |
3609 | } | |
cbe47ec5 | 3610 | } |
4ad1d984 | 3611 | } |
59fc630b | 3612 | |
4ad1d984 LG |
3613 | /* |
3614 | * Each stripe/dev can have one or more bios attached. | |
3615 | * toread/towrite point to the first in a chain. | |
3616 | * The bi_next chain must be in order. | |
3617 | */ | |
3618 | static bool add_stripe_bio(struct stripe_head *sh, struct bio *bi, | |
3619 | int dd_idx, int forwrite, int previous) | |
3620 | { | |
3621 | spin_lock_irq(&sh->stripe_lock); | |
1da177e4 | 3622 | |
4ad1d984 LG |
3623 | if (stripe_bio_overlaps(sh, bi, dd_idx, forwrite)) { |
3624 | set_bit(R5_Overlap, &sh->dev[dd_idx].flags); | |
3625 | spin_unlock_irq(&sh->stripe_lock); | |
3626 | return false; | |
3627 | } | |
3628 | ||
3629 | __add_stripe_bio(sh, bi, dd_idx, forwrite, previous); | |
b17459c0 | 3630 | spin_unlock_irq(&sh->stripe_lock); |
4ad1d984 | 3631 | return true; |
1da177e4 LT |
3632 | } |
3633 | ||
d1688a6d | 3634 | static void end_reshape(struct r5conf *conf); |
29269553 | 3635 | |
d1688a6d | 3636 | static void stripe_set_idx(sector_t stripe, struct r5conf *conf, int previous, |
911d4ee8 | 3637 | struct stripe_head *sh) |
ccfcc3c1 | 3638 | { |
784052ec | 3639 | int sectors_per_chunk = |
09c9e5fa | 3640 | previous ? conf->prev_chunk_sectors : conf->chunk_sectors; |
911d4ee8 | 3641 | int dd_idx; |
2d2063ce | 3642 | int chunk_offset = sector_div(stripe, sectors_per_chunk); |
112bf897 | 3643 | int disks = previous ? conf->previous_raid_disks : conf->raid_disks; |
2d2063ce | 3644 | |
112bf897 N |
3645 | raid5_compute_sector(conf, |
3646 | stripe * (disks - conf->max_degraded) | |
b875e531 | 3647 | *sectors_per_chunk + chunk_offset, |
112bf897 | 3648 | previous, |
911d4ee8 | 3649 | &dd_idx, sh); |
ccfcc3c1 N |
3650 | } |
3651 | ||
a4456856 | 3652 | static void |
d1688a6d | 3653 | handle_failed_stripe(struct r5conf *conf, struct stripe_head *sh, |
bd83d0a2 | 3654 | struct stripe_head_state *s, int disks) |
a4456856 DW |
3655 | { |
3656 | int i; | |
59fc630b | 3657 | BUG_ON(sh->batch_head); |
a4456856 DW |
3658 | for (i = disks; i--; ) { |
3659 | struct bio *bi; | |
3660 | int bitmap_end = 0; | |
3661 | ||
3662 | if (test_bit(R5_ReadError, &sh->dev[i].flags)) { | |
3cb03002 | 3663 | struct md_rdev *rdev; |
a4456856 DW |
3664 | rcu_read_lock(); |
3665 | rdev = rcu_dereference(conf->disks[i].rdev); | |
f5b67ae8 N |
3666 | if (rdev && test_bit(In_sync, &rdev->flags) && |
3667 | !test_bit(Faulty, &rdev->flags)) | |
7f0da59b N |
3668 | atomic_inc(&rdev->nr_pending); |
3669 | else | |
3670 | rdev = NULL; | |
a4456856 | 3671 | rcu_read_unlock(); |
7f0da59b N |
3672 | if (rdev) { |
3673 | if (!rdev_set_badblocks( | |
3674 | rdev, | |
3675 | sh->sector, | |
c911c46c | 3676 | RAID5_STRIPE_SECTORS(conf), 0)) |
7f0da59b N |
3677 | md_error(conf->mddev, rdev); |
3678 | rdev_dec_pending(rdev, conf->mddev); | |
3679 | } | |
a4456856 | 3680 | } |
b17459c0 | 3681 | spin_lock_irq(&sh->stripe_lock); |
a4456856 DW |
3682 | /* fail all writes first */ |
3683 | bi = sh->dev[i].towrite; | |
3684 | sh->dev[i].towrite = NULL; | |
7a87f434 | 3685 | sh->overwrite_disks = 0; |
b17459c0 | 3686 | spin_unlock_irq(&sh->stripe_lock); |
1ed850f3 | 3687 | if (bi) |
a4456856 | 3688 | bitmap_end = 1; |
a4456856 | 3689 | |
ff875738 | 3690 | log_stripe_write_finished(sh); |
0576b1c6 | 3691 | |
a4456856 DW |
3692 | if (test_and_clear_bit(R5_Overlap, &sh->dev[i].flags)) |
3693 | wake_up(&conf->wait_for_overlap); | |
3694 | ||
4f024f37 | 3695 | while (bi && bi->bi_iter.bi_sector < |
c911c46c YY |
3696 | sh->dev[i].sector + RAID5_STRIPE_SECTORS(conf)) { |
3697 | struct bio *nextbi = r5_next_bio(conf, bi, sh->dev[i].sector); | |
4246a0b6 | 3698 | |
49728050 | 3699 | md_write_end(conf->mddev); |
6308d8e3 | 3700 | bio_io_error(bi); |
a4456856 DW |
3701 | bi = nextbi; |
3702 | } | |
7eaf7e8e | 3703 | if (bitmap_end) |
e64e4018 | 3704 | md_bitmap_endwrite(conf->mddev->bitmap, sh->sector, |
c911c46c | 3705 | RAID5_STRIPE_SECTORS(conf), 0, 0); |
7eaf7e8e | 3706 | bitmap_end = 0; |
a4456856 DW |
3707 | /* and fail all 'written' */ |
3708 | bi = sh->dev[i].written; | |
3709 | sh->dev[i].written = NULL; | |
d592a996 SL |
3710 | if (test_and_clear_bit(R5_SkipCopy, &sh->dev[i].flags)) { |
3711 | WARN_ON(test_bit(R5_UPTODATE, &sh->dev[i].flags)); | |
3712 | sh->dev[i].page = sh->dev[i].orig_page; | |
3713 | } | |
3714 | ||
a4456856 | 3715 | if (bi) bitmap_end = 1; |
4f024f37 | 3716 | while (bi && bi->bi_iter.bi_sector < |
c911c46c YY |
3717 | sh->dev[i].sector + RAID5_STRIPE_SECTORS(conf)) { |
3718 | struct bio *bi2 = r5_next_bio(conf, bi, sh->dev[i].sector); | |
4246a0b6 | 3719 | |
49728050 | 3720 | md_write_end(conf->mddev); |
6308d8e3 | 3721 | bio_io_error(bi); |
a4456856 DW |
3722 | bi = bi2; |
3723 | } | |
3724 | ||
b5e98d65 DW |
3725 | /* fail any reads if this device is non-operational and |
3726 | * the data has not reached the cache yet. | |
3727 | */ | |
3728 | if (!test_bit(R5_Wantfill, &sh->dev[i].flags) && | |
6e74a9cf | 3729 | s->failed > conf->max_degraded && |
b5e98d65 DW |
3730 | (!test_bit(R5_Insync, &sh->dev[i].flags) || |
3731 | test_bit(R5_ReadError, &sh->dev[i].flags))) { | |
143c4d05 | 3732 | spin_lock_irq(&sh->stripe_lock); |
a4456856 DW |
3733 | bi = sh->dev[i].toread; |
3734 | sh->dev[i].toread = NULL; | |
143c4d05 | 3735 | spin_unlock_irq(&sh->stripe_lock); |
a4456856 DW |
3736 | if (test_and_clear_bit(R5_Overlap, &sh->dev[i].flags)) |
3737 | wake_up(&conf->wait_for_overlap); | |
ebda780b SL |
3738 | if (bi) |
3739 | s->to_read--; | |
4f024f37 | 3740 | while (bi && bi->bi_iter.bi_sector < |
c911c46c | 3741 | sh->dev[i].sector + RAID5_STRIPE_SECTORS(conf)) { |
a4456856 | 3742 | struct bio *nextbi = |
c911c46c | 3743 | r5_next_bio(conf, bi, sh->dev[i].sector); |
4246a0b6 | 3744 | |
6308d8e3 | 3745 | bio_io_error(bi); |
a4456856 DW |
3746 | bi = nextbi; |
3747 | } | |
3748 | } | |
a4456856 | 3749 | if (bitmap_end) |
e64e4018 | 3750 | md_bitmap_endwrite(conf->mddev->bitmap, sh->sector, |
c911c46c | 3751 | RAID5_STRIPE_SECTORS(conf), 0, 0); |
8cfa7b0f N |
3752 | /* If we were in the middle of a write the parity block might |
3753 | * still be locked - so just clear all R5_LOCKED flags | |
3754 | */ | |
3755 | clear_bit(R5_LOCKED, &sh->dev[i].flags); | |
a4456856 | 3756 | } |
ebda780b SL |
3757 | s->to_write = 0; |
3758 | s->written = 0; | |
a4456856 | 3759 | |
8b3e6cdc DW |
3760 | if (test_and_clear_bit(STRIPE_FULL_WRITE, &sh->state)) |
3761 | if (atomic_dec_and_test(&conf->pending_full_writes)) | |
3762 | md_wakeup_thread(conf->mddev->thread); | |
a4456856 DW |
3763 | } |
3764 | ||
7f0da59b | 3765 | static void |
d1688a6d | 3766 | handle_failed_sync(struct r5conf *conf, struct stripe_head *sh, |
7f0da59b N |
3767 | struct stripe_head_state *s) |
3768 | { | |
3769 | int abort = 0; | |
3770 | int i; | |
3771 | ||
59fc630b | 3772 | BUG_ON(sh->batch_head); |
7f0da59b | 3773 | clear_bit(STRIPE_SYNCING, &sh->state); |
f8dfcffd N |
3774 | if (test_and_clear_bit(R5_Overlap, &sh->dev[sh->pd_idx].flags)) |
3775 | wake_up(&conf->wait_for_overlap); | |
7f0da59b | 3776 | s->syncing = 0; |
9a3e1101 | 3777 | s->replacing = 0; |
7f0da59b | 3778 | /* There is nothing more to do for sync/check/repair. |
18b9837e N |
3779 | * Don't even need to abort as that is handled elsewhere |
3780 | * if needed, and not always wanted e.g. if there is a known | |
3781 | * bad block here. | |
9a3e1101 | 3782 | * For recover/replace we need to record a bad block on all |
7f0da59b N |
3783 | * non-sync devices, or abort the recovery |
3784 | */ | |
18b9837e N |
3785 | if (test_bit(MD_RECOVERY_RECOVER, &conf->mddev->recovery)) { |
3786 | /* During recovery devices cannot be removed, so | |
3787 | * locking and refcounting of rdevs is not needed | |
3788 | */ | |
e50d3992 | 3789 | rcu_read_lock(); |
18b9837e | 3790 | for (i = 0; i < conf->raid_disks; i++) { |
e50d3992 | 3791 | struct md_rdev *rdev = rcu_dereference(conf->disks[i].rdev); |
18b9837e N |
3792 | if (rdev |
3793 | && !test_bit(Faulty, &rdev->flags) | |
3794 | && !test_bit(In_sync, &rdev->flags) | |
3795 | && !rdev_set_badblocks(rdev, sh->sector, | |
c911c46c | 3796 | RAID5_STRIPE_SECTORS(conf), 0)) |
18b9837e | 3797 | abort = 1; |
e50d3992 | 3798 | rdev = rcu_dereference(conf->disks[i].replacement); |
18b9837e N |
3799 | if (rdev |
3800 | && !test_bit(Faulty, &rdev->flags) | |
3801 | && !test_bit(In_sync, &rdev->flags) | |
3802 | && !rdev_set_badblocks(rdev, sh->sector, | |
c911c46c | 3803 | RAID5_STRIPE_SECTORS(conf), 0)) |
18b9837e N |
3804 | abort = 1; |
3805 | } | |
e50d3992 | 3806 | rcu_read_unlock(); |
18b9837e N |
3807 | if (abort) |
3808 | conf->recovery_disabled = | |
3809 | conf->mddev->recovery_disabled; | |
7f0da59b | 3810 | } |
c911c46c | 3811 | md_done_sync(conf->mddev, RAID5_STRIPE_SECTORS(conf), !abort); |
7f0da59b N |
3812 | } |
3813 | ||
9a3e1101 N |
3814 | static int want_replace(struct stripe_head *sh, int disk_idx) |
3815 | { | |
3816 | struct md_rdev *rdev; | |
3817 | int rv = 0; | |
3f232d6a N |
3818 | |
3819 | rcu_read_lock(); | |
3820 | rdev = rcu_dereference(sh->raid_conf->disks[disk_idx].replacement); | |
9a3e1101 N |
3821 | if (rdev |
3822 | && !test_bit(Faulty, &rdev->flags) | |
3823 | && !test_bit(In_sync, &rdev->flags) | |
3824 | && (rdev->recovery_offset <= sh->sector | |
3825 | || rdev->mddev->recovery_cp <= sh->sector)) | |
3826 | rv = 1; | |
3f232d6a | 3827 | rcu_read_unlock(); |
9a3e1101 N |
3828 | return rv; |
3829 | } | |
3830 | ||
2c58f06e N |
3831 | static int need_this_block(struct stripe_head *sh, struct stripe_head_state *s, |
3832 | int disk_idx, int disks) | |
a4456856 | 3833 | { |
5599becc | 3834 | struct r5dev *dev = &sh->dev[disk_idx]; |
f2b3b44d N |
3835 | struct r5dev *fdev[2] = { &sh->dev[s->failed_num[0]], |
3836 | &sh->dev[s->failed_num[1]] }; | |
ea664c82 | 3837 | int i; |
45a4d8fd | 3838 | bool force_rcw = (sh->raid_conf->rmw_level == PARITY_DISABLE_RMW); |
5599becc | 3839 | |
a79cfe12 N |
3840 | |
3841 | if (test_bit(R5_LOCKED, &dev->flags) || | |
3842 | test_bit(R5_UPTODATE, &dev->flags)) | |
3843 | /* No point reading this as we already have it or have | |
3844 | * decided to get it. | |
3845 | */ | |
3846 | return 0; | |
3847 | ||
3848 | if (dev->toread || | |
3849 | (dev->towrite && !test_bit(R5_OVERWRITE, &dev->flags))) | |
3850 | /* We need this block to directly satisfy a request */ | |
3851 | return 1; | |
3852 | ||
3853 | if (s->syncing || s->expanding || | |
3854 | (s->replacing && want_replace(sh, disk_idx))) | |
3855 | /* When syncing, or expanding we read everything. | |
3856 | * When replacing, we need the replaced block. | |
3857 | */ | |
3858 | return 1; | |
3859 | ||
3860 | if ((s->failed >= 1 && fdev[0]->toread) || | |
3861 | (s->failed >= 2 && fdev[1]->toread)) | |
3862 | /* If we want to read from a failed device, then | |
3863 | * we need to actually read every other device. | |
3864 | */ | |
3865 | return 1; | |
3866 | ||
a9d56950 N |
3867 | /* Sometimes neither read-modify-write nor reconstruct-write |
3868 | * cycles can work. In those cases we read every block we | |
3869 | * can. Then the parity-update is certain to have enough to | |
3870 | * work with. | |
3871 | * This can only be a problem when we need to write something, | |
3872 | * and some device has failed. If either of those tests | |
3873 | * fail we need look no further. | |
3874 | */ | |
3875 | if (!s->failed || !s->to_write) | |
3876 | return 0; | |
3877 | ||
3878 | if (test_bit(R5_Insync, &dev->flags) && | |
3879 | !test_bit(STRIPE_PREREAD_ACTIVE, &sh->state)) | |
3880 | /* Pre-reads at not permitted until after short delay | |
3881 | * to gather multiple requests. However if this | |
3560741e | 3882 | * device is no Insync, the block could only be computed |
a9d56950 N |
3883 | * and there is no need to delay that. |
3884 | */ | |
3885 | return 0; | |
ea664c82 | 3886 | |
36707bb2 | 3887 | for (i = 0; i < s->failed && i < 2; i++) { |
ea664c82 N |
3888 | if (fdev[i]->towrite && |
3889 | !test_bit(R5_UPTODATE, &fdev[i]->flags) && | |
3890 | !test_bit(R5_OVERWRITE, &fdev[i]->flags)) | |
3891 | /* If we have a partial write to a failed | |
3892 | * device, then we will need to reconstruct | |
3893 | * the content of that device, so all other | |
3894 | * devices must be read. | |
3895 | */ | |
3896 | return 1; | |
45a4d8fd CP |
3897 | |
3898 | if (s->failed >= 2 && | |
3899 | (fdev[i]->towrite || | |
3900 | s->failed_num[i] == sh->pd_idx || | |
3901 | s->failed_num[i] == sh->qd_idx) && | |
3902 | !test_bit(R5_UPTODATE, &fdev[i]->flags)) | |
3903 | /* In max degraded raid6, If the failed disk is P, Q, | |
3904 | * or we want to read the failed disk, we need to do | |
3905 | * reconstruct-write. | |
3906 | */ | |
3907 | force_rcw = true; | |
ea664c82 N |
3908 | } |
3909 | ||
45a4d8fd CP |
3910 | /* If we are forced to do a reconstruct-write, because parity |
3911 | * cannot be trusted and we are currently recovering it, there | |
3912 | * is extra need to be careful. | |
ea664c82 N |
3913 | * If one of the devices that we would need to read, because |
3914 | * it is not being overwritten (and maybe not written at all) | |
3915 | * is missing/faulty, then we need to read everything we can. | |
3916 | */ | |
45a4d8fd | 3917 | if (!force_rcw && |
ea664c82 N |
3918 | sh->sector < sh->raid_conf->mddev->recovery_cp) |
3919 | /* reconstruct-write isn't being forced */ | |
3920 | return 0; | |
36707bb2 | 3921 | for (i = 0; i < s->failed && i < 2; i++) { |
10d82c5f N |
3922 | if (s->failed_num[i] != sh->pd_idx && |
3923 | s->failed_num[i] != sh->qd_idx && | |
3924 | !test_bit(R5_UPTODATE, &fdev[i]->flags) && | |
ea664c82 N |
3925 | !test_bit(R5_OVERWRITE, &fdev[i]->flags)) |
3926 | return 1; | |
3927 | } | |
3928 | ||
2c58f06e N |
3929 | return 0; |
3930 | } | |
3931 | ||
ba02684d SL |
3932 | /* fetch_block - checks the given member device to see if its data needs |
3933 | * to be read or computed to satisfy a request. | |
3934 | * | |
3935 | * Returns 1 when no more member devices need to be checked, otherwise returns | |
3936 | * 0 to tell the loop in handle_stripe_fill to continue | |
3937 | */ | |
2c58f06e N |
3938 | static int fetch_block(struct stripe_head *sh, struct stripe_head_state *s, |
3939 | int disk_idx, int disks) | |
3940 | { | |
3941 | struct r5dev *dev = &sh->dev[disk_idx]; | |
3942 | ||
3943 | /* is the data in this block needed, and can we get it? */ | |
3944 | if (need_this_block(sh, s, disk_idx, disks)) { | |
5599becc YT |
3945 | /* we would like to get this block, possibly by computing it, |
3946 | * otherwise read it if the backing disk is insync | |
3947 | */ | |
3948 | BUG_ON(test_bit(R5_Wantcompute, &dev->flags)); | |
3949 | BUG_ON(test_bit(R5_Wantread, &dev->flags)); | |
b0c783b3 | 3950 | BUG_ON(sh->batch_head); |
7471fb77 N |
3951 | |
3952 | /* | |
3953 | * In the raid6 case if the only non-uptodate disk is P | |
3954 | * then we already trusted P to compute the other failed | |
3955 | * drives. It is safe to compute rather than re-read P. | |
3956 | * In other cases we only compute blocks from failed | |
3957 | * devices, otherwise check/repair might fail to detect | |
3958 | * a real inconsistency. | |
3959 | */ | |
3960 | ||
5599becc | 3961 | if ((s->uptodate == disks - 1) && |
7471fb77 | 3962 | ((sh->qd_idx >= 0 && sh->pd_idx == disk_idx) || |
f2b3b44d | 3963 | (s->failed && (disk_idx == s->failed_num[0] || |
7471fb77 | 3964 | disk_idx == s->failed_num[1])))) { |
5599becc YT |
3965 | /* have disk failed, and we're requested to fetch it; |
3966 | * do compute it | |
a4456856 | 3967 | */ |
5599becc YT |
3968 | pr_debug("Computing stripe %llu block %d\n", |
3969 | (unsigned long long)sh->sector, disk_idx); | |
3970 | set_bit(STRIPE_COMPUTE_RUN, &sh->state); | |
3971 | set_bit(STRIPE_OP_COMPUTE_BLK, &s->ops_request); | |
3972 | set_bit(R5_Wantcompute, &dev->flags); | |
3973 | sh->ops.target = disk_idx; | |
3974 | sh->ops.target2 = -1; /* no 2nd target */ | |
3975 | s->req_compute = 1; | |
93b3dbce N |
3976 | /* Careful: from this point on 'uptodate' is in the eye |
3977 | * of raid_run_ops which services 'compute' operations | |
3978 | * before writes. R5_Wantcompute flags a block that will | |
3979 | * be R5_UPTODATE by the time it is needed for a | |
3980 | * subsequent operation. | |
3981 | */ | |
5599becc YT |
3982 | s->uptodate++; |
3983 | return 1; | |
3984 | } else if (s->uptodate == disks-2 && s->failed >= 2) { | |
3985 | /* Computing 2-failure is *very* expensive; only | |
3986 | * do it if failed >= 2 | |
3987 | */ | |
3988 | int other; | |
3989 | for (other = disks; other--; ) { | |
3990 | if (other == disk_idx) | |
3991 | continue; | |
3992 | if (!test_bit(R5_UPTODATE, | |
3993 | &sh->dev[other].flags)) | |
3994 | break; | |
a4456856 | 3995 | } |
5599becc YT |
3996 | BUG_ON(other < 0); |
3997 | pr_debug("Computing stripe %llu blocks %d,%d\n", | |
3998 | (unsigned long long)sh->sector, | |
3999 | disk_idx, other); | |
4000 | set_bit(STRIPE_COMPUTE_RUN, &sh->state); | |
4001 | set_bit(STRIPE_OP_COMPUTE_BLK, &s->ops_request); | |
4002 | set_bit(R5_Wantcompute, &sh->dev[disk_idx].flags); | |
4003 | set_bit(R5_Wantcompute, &sh->dev[other].flags); | |
4004 | sh->ops.target = disk_idx; | |
4005 | sh->ops.target2 = other; | |
4006 | s->uptodate += 2; | |
4007 | s->req_compute = 1; | |
4008 | return 1; | |
4009 | } else if (test_bit(R5_Insync, &dev->flags)) { | |
4010 | set_bit(R5_LOCKED, &dev->flags); | |
4011 | set_bit(R5_Wantread, &dev->flags); | |
4012 | s->locked++; | |
4013 | pr_debug("Reading block %d (sync=%d)\n", | |
4014 | disk_idx, s->syncing); | |
a4456856 DW |
4015 | } |
4016 | } | |
5599becc YT |
4017 | |
4018 | return 0; | |
4019 | } | |
4020 | ||
2aada5b1 | 4021 | /* |
93b3dbce | 4022 | * handle_stripe_fill - read or compute data to satisfy pending requests. |
5599becc | 4023 | */ |
93b3dbce N |
4024 | static void handle_stripe_fill(struct stripe_head *sh, |
4025 | struct stripe_head_state *s, | |
4026 | int disks) | |
5599becc YT |
4027 | { |
4028 | int i; | |
4029 | ||
4030 | /* look for blocks to read/compute, skip this if a compute | |
4031 | * is already in flight, or if the stripe contents are in the | |
4032 | * midst of changing due to a write | |
4033 | */ | |
4034 | if (!test_bit(STRIPE_COMPUTE_RUN, &sh->state) && !sh->check_state && | |
07e83364 SL |
4035 | !sh->reconstruct_state) { |
4036 | ||
4037 | /* | |
4038 | * For degraded stripe with data in journal, do not handle | |
4039 | * read requests yet, instead, flush the stripe to raid | |
4040 | * disks first, this avoids handling complex rmw of write | |
4041 | * back cache (prexor with orig_page, and then xor with | |
4042 | * page) in the read path | |
4043 | */ | |
e2eed85b | 4044 | if (s->to_read && s->injournal && s->failed) { |
07e83364 SL |
4045 | if (test_bit(STRIPE_R5C_CACHING, &sh->state)) |
4046 | r5c_make_stripe_write_out(sh); | |
4047 | goto out; | |
4048 | } | |
4049 | ||
5599becc | 4050 | for (i = disks; i--; ) |
93b3dbce | 4051 | if (fetch_block(sh, s, i, disks)) |
5599becc | 4052 | break; |
07e83364 SL |
4053 | } |
4054 | out: | |
a4456856 DW |
4055 | set_bit(STRIPE_HANDLE, &sh->state); |
4056 | } | |
4057 | ||
787b76fa N |
4058 | static void break_stripe_batch_list(struct stripe_head *head_sh, |
4059 | unsigned long handle_flags); | |
1fe797e6 | 4060 | /* handle_stripe_clean_event |
a4456856 DW |
4061 | * any written block on an uptodate or failed drive can be returned. |
4062 | * Note that if we 'wrote' to a failed drive, it will be UPTODATE, but | |
4063 | * never LOCKED, so we don't need to test 'failed' directly. | |
4064 | */ | |
d1688a6d | 4065 | static void handle_stripe_clean_event(struct r5conf *conf, |
bd83d0a2 | 4066 | struct stripe_head *sh, int disks) |
a4456856 DW |
4067 | { |
4068 | int i; | |
4069 | struct r5dev *dev; | |
f8dfcffd | 4070 | int discard_pending = 0; |
59fc630b | 4071 | struct stripe_head *head_sh = sh; |
4072 | bool do_endio = false; | |
a4456856 DW |
4073 | |
4074 | for (i = disks; i--; ) | |
4075 | if (sh->dev[i].written) { | |
4076 | dev = &sh->dev[i]; | |
4077 | if (!test_bit(R5_LOCKED, &dev->flags) && | |
9e444768 | 4078 | (test_bit(R5_UPTODATE, &dev->flags) || |
d592a996 SL |
4079 | test_bit(R5_Discard, &dev->flags) || |
4080 | test_bit(R5_SkipCopy, &dev->flags))) { | |
a4456856 DW |
4081 | /* We can return any write requests */ |
4082 | struct bio *wbi, *wbi2; | |
45b4233c | 4083 | pr_debug("Return write for disc %d\n", i); |
ca64cae9 N |
4084 | if (test_and_clear_bit(R5_Discard, &dev->flags)) |
4085 | clear_bit(R5_UPTODATE, &dev->flags); | |
d592a996 SL |
4086 | if (test_and_clear_bit(R5_SkipCopy, &dev->flags)) { |
4087 | WARN_ON(test_bit(R5_UPTODATE, &dev->flags)); | |
d592a996 | 4088 | } |
59fc630b | 4089 | do_endio = true; |
4090 | ||
4091 | returnbi: | |
4092 | dev->page = dev->orig_page; | |
a4456856 DW |
4093 | wbi = dev->written; |
4094 | dev->written = NULL; | |
4f024f37 | 4095 | while (wbi && wbi->bi_iter.bi_sector < |
c911c46c YY |
4096 | dev->sector + RAID5_STRIPE_SECTORS(conf)) { |
4097 | wbi2 = r5_next_bio(conf, wbi, dev->sector); | |
49728050 | 4098 | md_write_end(conf->mddev); |
016c76ac | 4099 | bio_endio(wbi); |
a4456856 DW |
4100 | wbi = wbi2; |
4101 | } | |
e64e4018 | 4102 | md_bitmap_endwrite(conf->mddev->bitmap, sh->sector, |
c911c46c | 4103 | RAID5_STRIPE_SECTORS(conf), |
e64e4018 AS |
4104 | !test_bit(STRIPE_DEGRADED, &sh->state), |
4105 | 0); | |
59fc630b | 4106 | if (head_sh->batch_head) { |
4107 | sh = list_first_entry(&sh->batch_list, | |
4108 | struct stripe_head, | |
4109 | batch_list); | |
4110 | if (sh != head_sh) { | |
4111 | dev = &sh->dev[i]; | |
4112 | goto returnbi; | |
4113 | } | |
4114 | } | |
4115 | sh = head_sh; | |
4116 | dev = &sh->dev[i]; | |
f8dfcffd N |
4117 | } else if (test_bit(R5_Discard, &dev->flags)) |
4118 | discard_pending = 1; | |
4119 | } | |
f6bed0ef | 4120 | |
ff875738 | 4121 | log_stripe_write_finished(sh); |
0576b1c6 | 4122 | |
f8dfcffd N |
4123 | if (!discard_pending && |
4124 | test_bit(R5_Discard, &sh->dev[sh->pd_idx].flags)) { | |
b8a9d66d | 4125 | int hash; |
f8dfcffd N |
4126 | clear_bit(R5_Discard, &sh->dev[sh->pd_idx].flags); |
4127 | clear_bit(R5_UPTODATE, &sh->dev[sh->pd_idx].flags); | |
4128 | if (sh->qd_idx >= 0) { | |
4129 | clear_bit(R5_Discard, &sh->dev[sh->qd_idx].flags); | |
4130 | clear_bit(R5_UPTODATE, &sh->dev[sh->qd_idx].flags); | |
4131 | } | |
4132 | /* now that discard is done we can proceed with any sync */ | |
4133 | clear_bit(STRIPE_DISCARD, &sh->state); | |
d47648fc SL |
4134 | /* |
4135 | * SCSI discard will change some bio fields and the stripe has | |
4136 | * no updated data, so remove it from hash list and the stripe | |
4137 | * will be reinitialized | |
4138 | */ | |
59fc630b | 4139 | unhash: |
b8a9d66d RG |
4140 | hash = sh->hash_lock_index; |
4141 | spin_lock_irq(conf->hash_locks + hash); | |
d47648fc | 4142 | remove_hash(sh); |
b8a9d66d | 4143 | spin_unlock_irq(conf->hash_locks + hash); |
59fc630b | 4144 | if (head_sh->batch_head) { |
4145 | sh = list_first_entry(&sh->batch_list, | |
4146 | struct stripe_head, batch_list); | |
4147 | if (sh != head_sh) | |
4148 | goto unhash; | |
4149 | } | |
59fc630b | 4150 | sh = head_sh; |
4151 | ||
f8dfcffd N |
4152 | if (test_bit(STRIPE_SYNC_REQUESTED, &sh->state)) |
4153 | set_bit(STRIPE_HANDLE, &sh->state); | |
4154 | ||
4155 | } | |
8b3e6cdc DW |
4156 | |
4157 | if (test_and_clear_bit(STRIPE_FULL_WRITE, &sh->state)) | |
4158 | if (atomic_dec_and_test(&conf->pending_full_writes)) | |
4159 | md_wakeup_thread(conf->mddev->thread); | |
59fc630b | 4160 | |
787b76fa N |
4161 | if (head_sh->batch_head && do_endio) |
4162 | break_stripe_batch_list(head_sh, STRIPE_EXPAND_SYNC_FLAGS); | |
a4456856 DW |
4163 | } |
4164 | ||
86aa1397 SL |
4165 | /* |
4166 | * For RMW in write back cache, we need extra page in prexor to store the | |
4167 | * old data. This page is stored in dev->orig_page. | |
4168 | * | |
4169 | * This function checks whether we have data for prexor. The exact logic | |
4170 | * is: | |
4171 | * R5_UPTODATE && (!R5_InJournal || R5_OrigPageUPTDODATE) | |
4172 | */ | |
4173 | static inline bool uptodate_for_rmw(struct r5dev *dev) | |
4174 | { | |
4175 | return (test_bit(R5_UPTODATE, &dev->flags)) && | |
4176 | (!test_bit(R5_InJournal, &dev->flags) || | |
4177 | test_bit(R5_OrigPageUPTDODATE, &dev->flags)); | |
4178 | } | |
4179 | ||
d7bd398e SL |
4180 | static int handle_stripe_dirtying(struct r5conf *conf, |
4181 | struct stripe_head *sh, | |
4182 | struct stripe_head_state *s, | |
4183 | int disks) | |
a4456856 DW |
4184 | { |
4185 | int rmw = 0, rcw = 0, i; | |
a7854487 AL |
4186 | sector_t recovery_cp = conf->mddev->recovery_cp; |
4187 | ||
584acdd4 | 4188 | /* Check whether resync is now happening or should start. |
a7854487 AL |
4189 | * If yes, then the array is dirty (after unclean shutdown or |
4190 | * initial creation), so parity in some stripes might be inconsistent. | |
4191 | * In this case, we need to always do reconstruct-write, to ensure | |
4192 | * that in case of drive failure or read-error correction, we | |
4193 | * generate correct data from the parity. | |
4194 | */ | |
584acdd4 | 4195 | if (conf->rmw_level == PARITY_DISABLE_RMW || |
26ac1073 N |
4196 | (recovery_cp < MaxSector && sh->sector >= recovery_cp && |
4197 | s->failed == 0)) { | |
a7854487 | 4198 | /* Calculate the real rcw later - for now make it |
c8ac1803 N |
4199 | * look like rcw is cheaper |
4200 | */ | |
4201 | rcw = 1; rmw = 2; | |
584acdd4 MS |
4202 | pr_debug("force RCW rmw_level=%u, recovery_cp=%llu sh->sector=%llu\n", |
4203 | conf->rmw_level, (unsigned long long)recovery_cp, | |
a7854487 | 4204 | (unsigned long long)sh->sector); |
c8ac1803 | 4205 | } else for (i = disks; i--; ) { |
a4456856 DW |
4206 | /* would I have to read this buffer for read_modify_write */ |
4207 | struct r5dev *dev = &sh->dev[i]; | |
39b99586 | 4208 | if (((dev->towrite && !delay_towrite(conf, dev, s)) || |
07e83364 | 4209 | i == sh->pd_idx || i == sh->qd_idx || |
1e6d690b | 4210 | test_bit(R5_InJournal, &dev->flags)) && |
a4456856 | 4211 | !test_bit(R5_LOCKED, &dev->flags) && |
86aa1397 | 4212 | !(uptodate_for_rmw(dev) || |
f38e1219 | 4213 | test_bit(R5_Wantcompute, &dev->flags))) { |
a4456856 DW |
4214 | if (test_bit(R5_Insync, &dev->flags)) |
4215 | rmw++; | |
4216 | else | |
4217 | rmw += 2*disks; /* cannot read it */ | |
4218 | } | |
4219 | /* Would I have to read this buffer for reconstruct_write */ | |
584acdd4 MS |
4220 | if (!test_bit(R5_OVERWRITE, &dev->flags) && |
4221 | i != sh->pd_idx && i != sh->qd_idx && | |
a4456856 | 4222 | !test_bit(R5_LOCKED, &dev->flags) && |
f38e1219 | 4223 | !(test_bit(R5_UPTODATE, &dev->flags) || |
1e6d690b | 4224 | test_bit(R5_Wantcompute, &dev->flags))) { |
67f45548 N |
4225 | if (test_bit(R5_Insync, &dev->flags)) |
4226 | rcw++; | |
a4456856 DW |
4227 | else |
4228 | rcw += 2*disks; | |
4229 | } | |
4230 | } | |
1e6d690b | 4231 | |
39b99586 SL |
4232 | pr_debug("for sector %llu state 0x%lx, rmw=%d rcw=%d\n", |
4233 | (unsigned long long)sh->sector, sh->state, rmw, rcw); | |
a4456856 | 4234 | set_bit(STRIPE_HANDLE, &sh->state); |
41257580 | 4235 | if ((rmw < rcw || (rmw == rcw && conf->rmw_level == PARITY_PREFER_RMW)) && rmw > 0) { |
a4456856 | 4236 | /* prefer read-modify-write, but need to get some data */ |
e3620a3a JB |
4237 | if (conf->mddev->queue) |
4238 | blk_add_trace_msg(conf->mddev->queue, | |
4239 | "raid5 rmw %llu %d", | |
4240 | (unsigned long long)sh->sector, rmw); | |
a4456856 DW |
4241 | for (i = disks; i--; ) { |
4242 | struct r5dev *dev = &sh->dev[i]; | |
1e6d690b SL |
4243 | if (test_bit(R5_InJournal, &dev->flags) && |
4244 | dev->page == dev->orig_page && | |
4245 | !test_bit(R5_LOCKED, &sh->dev[sh->pd_idx].flags)) { | |
4246 | /* alloc page for prexor */ | |
d7bd398e SL |
4247 | struct page *p = alloc_page(GFP_NOIO); |
4248 | ||
4249 | if (p) { | |
4250 | dev->orig_page = p; | |
4251 | continue; | |
4252 | } | |
4253 | ||
4254 | /* | |
4255 | * alloc_page() failed, try use | |
4256 | * disk_info->extra_page | |
4257 | */ | |
4258 | if (!test_and_set_bit(R5C_EXTRA_PAGE_IN_USE, | |
4259 | &conf->cache_state)) { | |
4260 | r5c_use_extra_page(sh); | |
4261 | break; | |
4262 | } | |
1e6d690b | 4263 | |
d7bd398e SL |
4264 | /* extra_page in use, add to delayed_list */ |
4265 | set_bit(STRIPE_DELAYED, &sh->state); | |
4266 | s->waiting_extra_page = 1; | |
4267 | return -EAGAIN; | |
1e6d690b | 4268 | } |
d7bd398e | 4269 | } |
1e6d690b | 4270 | |
d7bd398e SL |
4271 | for (i = disks; i--; ) { |
4272 | struct r5dev *dev = &sh->dev[i]; | |
39b99586 | 4273 | if (((dev->towrite && !delay_towrite(conf, dev, s)) || |
1e6d690b SL |
4274 | i == sh->pd_idx || i == sh->qd_idx || |
4275 | test_bit(R5_InJournal, &dev->flags)) && | |
a4456856 | 4276 | !test_bit(R5_LOCKED, &dev->flags) && |
86aa1397 | 4277 | !(uptodate_for_rmw(dev) || |
1e6d690b | 4278 | test_bit(R5_Wantcompute, &dev->flags)) && |
a4456856 | 4279 | test_bit(R5_Insync, &dev->flags)) { |
67f45548 N |
4280 | if (test_bit(STRIPE_PREREAD_ACTIVE, |
4281 | &sh->state)) { | |
4282 | pr_debug("Read_old block %d for r-m-w\n", | |
4283 | i); | |
a4456856 DW |
4284 | set_bit(R5_LOCKED, &dev->flags); |
4285 | set_bit(R5_Wantread, &dev->flags); | |
4286 | s->locked++; | |
e3914d59 | 4287 | } else |
a4456856 | 4288 | set_bit(STRIPE_DELAYED, &sh->state); |
a4456856 DW |
4289 | } |
4290 | } | |
a9add5d9 | 4291 | } |
41257580 | 4292 | if ((rcw < rmw || (rcw == rmw && conf->rmw_level != PARITY_PREFER_RMW)) && rcw > 0) { |
a4456856 | 4293 | /* want reconstruct write, but need to get some data */ |
a9add5d9 | 4294 | int qread =0; |
c8ac1803 | 4295 | rcw = 0; |
a4456856 DW |
4296 | for (i = disks; i--; ) { |
4297 | struct r5dev *dev = &sh->dev[i]; | |
4298 | if (!test_bit(R5_OVERWRITE, &dev->flags) && | |
c8ac1803 | 4299 | i != sh->pd_idx && i != sh->qd_idx && |
a4456856 | 4300 | !test_bit(R5_LOCKED, &dev->flags) && |
f38e1219 | 4301 | !(test_bit(R5_UPTODATE, &dev->flags) || |
c8ac1803 N |
4302 | test_bit(R5_Wantcompute, &dev->flags))) { |
4303 | rcw++; | |
67f45548 N |
4304 | if (test_bit(R5_Insync, &dev->flags) && |
4305 | test_bit(STRIPE_PREREAD_ACTIVE, | |
4306 | &sh->state)) { | |
45b4233c | 4307 | pr_debug("Read_old block " |
a4456856 DW |
4308 | "%d for Reconstruct\n", i); |
4309 | set_bit(R5_LOCKED, &dev->flags); | |
4310 | set_bit(R5_Wantread, &dev->flags); | |
4311 | s->locked++; | |
a9add5d9 | 4312 | qread++; |
e3914d59 | 4313 | } else |
a4456856 | 4314 | set_bit(STRIPE_DELAYED, &sh->state); |
a4456856 DW |
4315 | } |
4316 | } | |
e3620a3a | 4317 | if (rcw && conf->mddev->queue) |
a9add5d9 N |
4318 | blk_add_trace_msg(conf->mddev->queue, "raid5 rcw %llu %d %d %d", |
4319 | (unsigned long long)sh->sector, | |
4320 | rcw, qread, test_bit(STRIPE_DELAYED, &sh->state)); | |
c8ac1803 | 4321 | } |
b1b02fe9 N |
4322 | |
4323 | if (rcw > disks && rmw > disks && | |
4324 | !test_bit(STRIPE_PREREAD_ACTIVE, &sh->state)) | |
4325 | set_bit(STRIPE_DELAYED, &sh->state); | |
4326 | ||
a4456856 DW |
4327 | /* now if nothing is locked, and if we have enough data, |
4328 | * we can start a write request | |
4329 | */ | |
f38e1219 DW |
4330 | /* since handle_stripe can be called at any time we need to handle the |
4331 | * case where a compute block operation has been submitted and then a | |
ac6b53b6 DW |
4332 | * subsequent call wants to start a write request. raid_run_ops only |
4333 | * handles the case where compute block and reconstruct are requested | |
f38e1219 DW |
4334 | * simultaneously. If this is not the case then new writes need to be |
4335 | * held off until the compute completes. | |
4336 | */ | |
976ea8d4 DW |
4337 | if ((s->req_compute || !test_bit(STRIPE_COMPUTE_RUN, &sh->state)) && |
4338 | (s->locked == 0 && (rcw == 0 || rmw == 0) && | |
1e6d690b | 4339 | !test_bit(STRIPE_BIT_DELAY, &sh->state))) |
c0f7bddb | 4340 | schedule_reconstruction(sh, s, rcw == 0, 0); |
d7bd398e | 4341 | return 0; |
a4456856 DW |
4342 | } |
4343 | ||
d1688a6d | 4344 | static void handle_parity_checks5(struct r5conf *conf, struct stripe_head *sh, |
a4456856 DW |
4345 | struct stripe_head_state *s, int disks) |
4346 | { | |
ecc65c9b | 4347 | struct r5dev *dev = NULL; |
bd2ab670 | 4348 | |
59fc630b | 4349 | BUG_ON(sh->batch_head); |
a4456856 | 4350 | set_bit(STRIPE_HANDLE, &sh->state); |
e89f8962 | 4351 | |
ecc65c9b DW |
4352 | switch (sh->check_state) { |
4353 | case check_state_idle: | |
4354 | /* start a new check operation if there are no failures */ | |
bd2ab670 | 4355 | if (s->failed == 0) { |
bd2ab670 | 4356 | BUG_ON(s->uptodate != disks); |
ecc65c9b DW |
4357 | sh->check_state = check_state_run; |
4358 | set_bit(STRIPE_OP_CHECK, &s->ops_request); | |
bd2ab670 | 4359 | clear_bit(R5_UPTODATE, &sh->dev[sh->pd_idx].flags); |
bd2ab670 | 4360 | s->uptodate--; |
ecc65c9b | 4361 | break; |
bd2ab670 | 4362 | } |
f2b3b44d | 4363 | dev = &sh->dev[s->failed_num[0]]; |
df561f66 | 4364 | fallthrough; |
ecc65c9b DW |
4365 | case check_state_compute_result: |
4366 | sh->check_state = check_state_idle; | |
4367 | if (!dev) | |
4368 | dev = &sh->dev[sh->pd_idx]; | |
4369 | ||
4370 | /* check that a write has not made the stripe insync */ | |
4371 | if (test_bit(STRIPE_INSYNC, &sh->state)) | |
4372 | break; | |
c8894419 | 4373 | |
a4456856 | 4374 | /* either failed parity check, or recovery is happening */ |
a4456856 DW |
4375 | BUG_ON(!test_bit(R5_UPTODATE, &dev->flags)); |
4376 | BUG_ON(s->uptodate != disks); | |
4377 | ||
4378 | set_bit(R5_LOCKED, &dev->flags); | |
ecc65c9b | 4379 | s->locked++; |
a4456856 | 4380 | set_bit(R5_Wantwrite, &dev->flags); |
830ea016 | 4381 | |
a4456856 | 4382 | clear_bit(STRIPE_DEGRADED, &sh->state); |
a4456856 | 4383 | set_bit(STRIPE_INSYNC, &sh->state); |
ecc65c9b DW |
4384 | break; |
4385 | case check_state_run: | |
4386 | break; /* we will be called again upon completion */ | |
4387 | case check_state_check_result: | |
4388 | sh->check_state = check_state_idle; | |
4389 | ||
4390 | /* if a failure occurred during the check operation, leave | |
4391 | * STRIPE_INSYNC not set and let the stripe be handled again | |
4392 | */ | |
4393 | if (s->failed) | |
4394 | break; | |
4395 | ||
4396 | /* handle a successful check operation, if parity is correct | |
4397 | * we are done. Otherwise update the mismatch count and repair | |
4398 | * parity if !MD_RECOVERY_CHECK | |
4399 | */ | |
ad283ea4 | 4400 | if ((sh->ops.zero_sum_result & SUM_CHECK_P_RESULT) == 0) |
ecc65c9b DW |
4401 | /* parity is correct (on disc, |
4402 | * not in buffer any more) | |
4403 | */ | |
4404 | set_bit(STRIPE_INSYNC, &sh->state); | |
4405 | else { | |
c911c46c | 4406 | atomic64_add(RAID5_STRIPE_SECTORS(conf), &conf->mddev->resync_mismatches); |
e1539036 | 4407 | if (test_bit(MD_RECOVERY_CHECK, &conf->mddev->recovery)) { |
ecc65c9b DW |
4408 | /* don't try to repair!! */ |
4409 | set_bit(STRIPE_INSYNC, &sh->state); | |
e1539036 N |
4410 | pr_warn_ratelimited("%s: mismatch sector in range " |
4411 | "%llu-%llu\n", mdname(conf->mddev), | |
4412 | (unsigned long long) sh->sector, | |
4413 | (unsigned long long) sh->sector + | |
c911c46c | 4414 | RAID5_STRIPE_SECTORS(conf)); |
e1539036 | 4415 | } else { |
ecc65c9b | 4416 | sh->check_state = check_state_compute_run; |
976ea8d4 | 4417 | set_bit(STRIPE_COMPUTE_RUN, &sh->state); |
ecc65c9b DW |
4418 | set_bit(STRIPE_OP_COMPUTE_BLK, &s->ops_request); |
4419 | set_bit(R5_Wantcompute, | |
4420 | &sh->dev[sh->pd_idx].flags); | |
4421 | sh->ops.target = sh->pd_idx; | |
ac6b53b6 | 4422 | sh->ops.target2 = -1; |
ecc65c9b DW |
4423 | s->uptodate++; |
4424 | } | |
4425 | } | |
4426 | break; | |
4427 | case check_state_compute_run: | |
4428 | break; | |
4429 | default: | |
cc6167b4 | 4430 | pr_err("%s: unknown check_state: %d sector: %llu\n", |
ecc65c9b DW |
4431 | __func__, sh->check_state, |
4432 | (unsigned long long) sh->sector); | |
4433 | BUG(); | |
a4456856 DW |
4434 | } |
4435 | } | |
4436 | ||
d1688a6d | 4437 | static void handle_parity_checks6(struct r5conf *conf, struct stripe_head *sh, |
36d1c647 | 4438 | struct stripe_head_state *s, |
f2b3b44d | 4439 | int disks) |
a4456856 | 4440 | { |
a4456856 | 4441 | int pd_idx = sh->pd_idx; |
34e04e87 | 4442 | int qd_idx = sh->qd_idx; |
d82dfee0 | 4443 | struct r5dev *dev; |
a4456856 | 4444 | |
59fc630b | 4445 | BUG_ON(sh->batch_head); |
a4456856 DW |
4446 | set_bit(STRIPE_HANDLE, &sh->state); |
4447 | ||
4448 | BUG_ON(s->failed > 2); | |
d82dfee0 | 4449 | |
a4456856 DW |
4450 | /* Want to check and possibly repair P and Q. |
4451 | * However there could be one 'failed' device, in which | |
4452 | * case we can only check one of them, possibly using the | |
4453 | * other to generate missing data | |
4454 | */ | |
4455 | ||
d82dfee0 DW |
4456 | switch (sh->check_state) { |
4457 | case check_state_idle: | |
4458 | /* start a new check operation if there are < 2 failures */ | |
f2b3b44d | 4459 | if (s->failed == s->q_failed) { |
d82dfee0 | 4460 | /* The only possible failed device holds Q, so it |
a4456856 DW |
4461 | * makes sense to check P (If anything else were failed, |
4462 | * we would have used P to recreate it). | |
4463 | */ | |
d82dfee0 | 4464 | sh->check_state = check_state_run; |
a4456856 | 4465 | } |
f2b3b44d | 4466 | if (!s->q_failed && s->failed < 2) { |
d82dfee0 | 4467 | /* Q is not failed, and we didn't use it to generate |
a4456856 DW |
4468 | * anything, so it makes sense to check it |
4469 | */ | |
d82dfee0 DW |
4470 | if (sh->check_state == check_state_run) |
4471 | sh->check_state = check_state_run_pq; | |
4472 | else | |
4473 | sh->check_state = check_state_run_q; | |
a4456856 | 4474 | } |
a4456856 | 4475 | |
d82dfee0 DW |
4476 | /* discard potentially stale zero_sum_result */ |
4477 | sh->ops.zero_sum_result = 0; | |
a4456856 | 4478 | |
d82dfee0 DW |
4479 | if (sh->check_state == check_state_run) { |
4480 | /* async_xor_zero_sum destroys the contents of P */ | |
4481 | clear_bit(R5_UPTODATE, &sh->dev[pd_idx].flags); | |
4482 | s->uptodate--; | |
a4456856 | 4483 | } |
d82dfee0 DW |
4484 | if (sh->check_state >= check_state_run && |
4485 | sh->check_state <= check_state_run_pq) { | |
4486 | /* async_syndrome_zero_sum preserves P and Q, so | |
4487 | * no need to mark them !uptodate here | |
4488 | */ | |
4489 | set_bit(STRIPE_OP_CHECK, &s->ops_request); | |
4490 | break; | |
a4456856 DW |
4491 | } |
4492 | ||
d82dfee0 DW |
4493 | /* we have 2-disk failure */ |
4494 | BUG_ON(s->failed != 2); | |
df561f66 | 4495 | fallthrough; |
d82dfee0 DW |
4496 | case check_state_compute_result: |
4497 | sh->check_state = check_state_idle; | |
a4456856 | 4498 | |
d82dfee0 DW |
4499 | /* check that a write has not made the stripe insync */ |
4500 | if (test_bit(STRIPE_INSYNC, &sh->state)) | |
4501 | break; | |
a4456856 DW |
4502 | |
4503 | /* now write out any block on a failed drive, | |
d82dfee0 | 4504 | * or P or Q if they were recomputed |
a4456856 | 4505 | */ |
b2176a1d | 4506 | dev = NULL; |
a4456856 | 4507 | if (s->failed == 2) { |
f2b3b44d | 4508 | dev = &sh->dev[s->failed_num[1]]; |
a4456856 DW |
4509 | s->locked++; |
4510 | set_bit(R5_LOCKED, &dev->flags); | |
4511 | set_bit(R5_Wantwrite, &dev->flags); | |
4512 | } | |
4513 | if (s->failed >= 1) { | |
f2b3b44d | 4514 | dev = &sh->dev[s->failed_num[0]]; |
a4456856 DW |
4515 | s->locked++; |
4516 | set_bit(R5_LOCKED, &dev->flags); | |
4517 | set_bit(R5_Wantwrite, &dev->flags); | |
4518 | } | |
d82dfee0 | 4519 | if (sh->ops.zero_sum_result & SUM_CHECK_P_RESULT) { |
a4456856 DW |
4520 | dev = &sh->dev[pd_idx]; |
4521 | s->locked++; | |
4522 | set_bit(R5_LOCKED, &dev->flags); | |
4523 | set_bit(R5_Wantwrite, &dev->flags); | |
4524 | } | |
d82dfee0 | 4525 | if (sh->ops.zero_sum_result & SUM_CHECK_Q_RESULT) { |
a4456856 DW |
4526 | dev = &sh->dev[qd_idx]; |
4527 | s->locked++; | |
4528 | set_bit(R5_LOCKED, &dev->flags); | |
4529 | set_bit(R5_Wantwrite, &dev->flags); | |
4530 | } | |
b2176a1d NC |
4531 | if (WARN_ONCE(dev && !test_bit(R5_UPTODATE, &dev->flags), |
4532 | "%s: disk%td not up to date\n", | |
4533 | mdname(conf->mddev), | |
4534 | dev - (struct r5dev *) &sh->dev)) { | |
4535 | clear_bit(R5_LOCKED, &dev->flags); | |
4536 | clear_bit(R5_Wantwrite, &dev->flags); | |
4537 | s->locked--; | |
4538 | } | |
a4456856 DW |
4539 | clear_bit(STRIPE_DEGRADED, &sh->state); |
4540 | ||
4541 | set_bit(STRIPE_INSYNC, &sh->state); | |
d82dfee0 DW |
4542 | break; |
4543 | case check_state_run: | |
4544 | case check_state_run_q: | |
4545 | case check_state_run_pq: | |
4546 | break; /* we will be called again upon completion */ | |
4547 | case check_state_check_result: | |
4548 | sh->check_state = check_state_idle; | |
4549 | ||
4550 | /* handle a successful check operation, if parity is correct | |
4551 | * we are done. Otherwise update the mismatch count and repair | |
4552 | * parity if !MD_RECOVERY_CHECK | |
4553 | */ | |
4554 | if (sh->ops.zero_sum_result == 0) { | |
a25d8c32 SL |
4555 | /* both parities are correct */ |
4556 | if (!s->failed) | |
4557 | set_bit(STRIPE_INSYNC, &sh->state); | |
4558 | else { | |
4559 | /* in contrast to the raid5 case we can validate | |
4560 | * parity, but still have a failure to write | |
4561 | * back | |
4562 | */ | |
4563 | sh->check_state = check_state_compute_result; | |
4564 | /* Returning at this point means that we may go | |
4565 | * off and bring p and/or q uptodate again so | |
4566 | * we make sure to check zero_sum_result again | |
4567 | * to verify if p or q need writeback | |
4568 | */ | |
4569 | } | |
d82dfee0 | 4570 | } else { |
c911c46c | 4571 | atomic64_add(RAID5_STRIPE_SECTORS(conf), &conf->mddev->resync_mismatches); |
e1539036 | 4572 | if (test_bit(MD_RECOVERY_CHECK, &conf->mddev->recovery)) { |
d82dfee0 DW |
4573 | /* don't try to repair!! */ |
4574 | set_bit(STRIPE_INSYNC, &sh->state); | |
e1539036 N |
4575 | pr_warn_ratelimited("%s: mismatch sector in range " |
4576 | "%llu-%llu\n", mdname(conf->mddev), | |
4577 | (unsigned long long) sh->sector, | |
4578 | (unsigned long long) sh->sector + | |
c911c46c | 4579 | RAID5_STRIPE_SECTORS(conf)); |
e1539036 | 4580 | } else { |
d82dfee0 DW |
4581 | int *target = &sh->ops.target; |
4582 | ||
4583 | sh->ops.target = -1; | |
4584 | sh->ops.target2 = -1; | |
4585 | sh->check_state = check_state_compute_run; | |
4586 | set_bit(STRIPE_COMPUTE_RUN, &sh->state); | |
4587 | set_bit(STRIPE_OP_COMPUTE_BLK, &s->ops_request); | |
4588 | if (sh->ops.zero_sum_result & SUM_CHECK_P_RESULT) { | |
4589 | set_bit(R5_Wantcompute, | |
4590 | &sh->dev[pd_idx].flags); | |
4591 | *target = pd_idx; | |
4592 | target = &sh->ops.target2; | |
4593 | s->uptodate++; | |
4594 | } | |
4595 | if (sh->ops.zero_sum_result & SUM_CHECK_Q_RESULT) { | |
4596 | set_bit(R5_Wantcompute, | |
4597 | &sh->dev[qd_idx].flags); | |
4598 | *target = qd_idx; | |
4599 | s->uptodate++; | |
4600 | } | |
4601 | } | |
4602 | } | |
4603 | break; | |
4604 | case check_state_compute_run: | |
4605 | break; | |
4606 | default: | |
cc6167b4 N |
4607 | pr_warn("%s: unknown check_state: %d sector: %llu\n", |
4608 | __func__, sh->check_state, | |
4609 | (unsigned long long) sh->sector); | |
d82dfee0 | 4610 | BUG(); |
a4456856 DW |
4611 | } |
4612 | } | |
4613 | ||
d1688a6d | 4614 | static void handle_stripe_expansion(struct r5conf *conf, struct stripe_head *sh) |
a4456856 DW |
4615 | { |
4616 | int i; | |
4617 | ||
4618 | /* We have read all the blocks in this stripe and now we need to | |
4619 | * copy some of them into a target stripe for expand. | |
4620 | */ | |
f0a50d37 | 4621 | struct dma_async_tx_descriptor *tx = NULL; |
59fc630b | 4622 | BUG_ON(sh->batch_head); |
a4456856 DW |
4623 | clear_bit(STRIPE_EXPAND_SOURCE, &sh->state); |
4624 | for (i = 0; i < sh->disks; i++) | |
34e04e87 | 4625 | if (i != sh->pd_idx && i != sh->qd_idx) { |
911d4ee8 | 4626 | int dd_idx, j; |
a4456856 | 4627 | struct stripe_head *sh2; |
a08abd8c | 4628 | struct async_submit_ctl submit; |
a4456856 | 4629 | |
6d036f7d | 4630 | sector_t bn = raid5_compute_blocknr(sh, i, 1); |
911d4ee8 N |
4631 | sector_t s = raid5_compute_sector(conf, bn, 0, |
4632 | &dd_idx, NULL); | |
2f2d51ef LG |
4633 | sh2 = raid5_get_active_stripe(conf, NULL, s, |
4634 | R5_GAS_NOBLOCK | R5_GAS_NOQUIESCE); | |
a4456856 DW |
4635 | if (sh2 == NULL) |
4636 | /* so far only the early blocks of this stripe | |
4637 | * have been requested. When later blocks | |
4638 | * get requested, we will try again | |
4639 | */ | |
4640 | continue; | |
4641 | if (!test_bit(STRIPE_EXPANDING, &sh2->state) || | |
4642 | test_bit(R5_Expanded, &sh2->dev[dd_idx].flags)) { | |
4643 | /* must have already done this block */ | |
6d036f7d | 4644 | raid5_release_stripe(sh2); |
a4456856 DW |
4645 | continue; |
4646 | } | |
f0a50d37 DW |
4647 | |
4648 | /* place all the copies on one channel */ | |
a08abd8c | 4649 | init_async_submit(&submit, 0, tx, NULL, NULL, NULL); |
f0a50d37 | 4650 | tx = async_memcpy(sh2->dev[dd_idx].page, |
7aba13b7 YY |
4651 | sh->dev[i].page, sh2->dev[dd_idx].offset, |
4652 | sh->dev[i].offset, RAID5_STRIPE_SIZE(conf), | |
a08abd8c | 4653 | &submit); |
f0a50d37 | 4654 | |
a4456856 DW |
4655 | set_bit(R5_Expanded, &sh2->dev[dd_idx].flags); |
4656 | set_bit(R5_UPTODATE, &sh2->dev[dd_idx].flags); | |
4657 | for (j = 0; j < conf->raid_disks; j++) | |
4658 | if (j != sh2->pd_idx && | |
86c374ba | 4659 | j != sh2->qd_idx && |
a4456856 DW |
4660 | !test_bit(R5_Expanded, &sh2->dev[j].flags)) |
4661 | break; | |
4662 | if (j == conf->raid_disks) { | |
4663 | set_bit(STRIPE_EXPAND_READY, &sh2->state); | |
4664 | set_bit(STRIPE_HANDLE, &sh2->state); | |
4665 | } | |
6d036f7d | 4666 | raid5_release_stripe(sh2); |
f0a50d37 | 4667 | |
a4456856 | 4668 | } |
a2e08551 | 4669 | /* done submitting copies, wait for them to complete */ |
749586b7 | 4670 | async_tx_quiesce(&tx); |
a4456856 | 4671 | } |
1da177e4 LT |
4672 | |
4673 | /* | |
4674 | * handle_stripe - do things to a stripe. | |
4675 | * | |
9a3e1101 N |
4676 | * We lock the stripe by setting STRIPE_ACTIVE and then examine the |
4677 | * state of various bits to see what needs to be done. | |
1da177e4 | 4678 | * Possible results: |
9a3e1101 N |
4679 | * return some read requests which now have data |
4680 | * return some write requests which are safely on storage | |
1da177e4 LT |
4681 | * schedule a read on some buffers |
4682 | * schedule a write of some buffers | |
4683 | * return confirmation of parity correctness | |
4684 | * | |
1da177e4 | 4685 | */ |
a4456856 | 4686 | |
acfe726b | 4687 | static void analyse_stripe(struct stripe_head *sh, struct stripe_head_state *s) |
1da177e4 | 4688 | { |
d1688a6d | 4689 | struct r5conf *conf = sh->raid_conf; |
f416885e | 4690 | int disks = sh->disks; |
474af965 N |
4691 | struct r5dev *dev; |
4692 | int i; | |
9a3e1101 | 4693 | int do_recovery = 0; |
1da177e4 | 4694 | |
acfe726b N |
4695 | memset(s, 0, sizeof(*s)); |
4696 | ||
dabc4ec6 | 4697 | s->expanding = test_bit(STRIPE_EXPAND_SOURCE, &sh->state) && !sh->batch_head; |
4698 | s->expanded = test_bit(STRIPE_EXPAND_READY, &sh->state) && !sh->batch_head; | |
acfe726b N |
4699 | s->failed_num[0] = -1; |
4700 | s->failed_num[1] = -1; | |
6e74a9cf | 4701 | s->log_failed = r5l_log_disk_error(conf); |
1da177e4 | 4702 | |
acfe726b | 4703 | /* Now to look around and see what can be done */ |
1da177e4 | 4704 | rcu_read_lock(); |
16a53ecc | 4705 | for (i=disks; i--; ) { |
3cb03002 | 4706 | struct md_rdev *rdev; |
31c176ec N |
4707 | sector_t first_bad; |
4708 | int bad_sectors; | |
4709 | int is_bad = 0; | |
acfe726b | 4710 | |
16a53ecc | 4711 | dev = &sh->dev[i]; |
1da177e4 | 4712 | |
45b4233c | 4713 | pr_debug("check %d: state 0x%lx read %p write %p written %p\n", |
9a3e1101 N |
4714 | i, dev->flags, |
4715 | dev->toread, dev->towrite, dev->written); | |
6c0069c0 YT |
4716 | /* maybe we can reply to a read |
4717 | * | |
4718 | * new wantfill requests are only permitted while | |
4719 | * ops_complete_biofill is guaranteed to be inactive | |
4720 | */ | |
4721 | if (test_bit(R5_UPTODATE, &dev->flags) && dev->toread && | |
4722 | !test_bit(STRIPE_BIOFILL_RUN, &sh->state)) | |
4723 | set_bit(R5_Wantfill, &dev->flags); | |
1da177e4 | 4724 | |
16a53ecc | 4725 | /* now count some things */ |
cc94015a N |
4726 | if (test_bit(R5_LOCKED, &dev->flags)) |
4727 | s->locked++; | |
4728 | if (test_bit(R5_UPTODATE, &dev->flags)) | |
4729 | s->uptodate++; | |
2d6e4ecc | 4730 | if (test_bit(R5_Wantcompute, &dev->flags)) { |
cc94015a N |
4731 | s->compute++; |
4732 | BUG_ON(s->compute > 2); | |
2d6e4ecc | 4733 | } |
1da177e4 | 4734 | |
acfe726b | 4735 | if (test_bit(R5_Wantfill, &dev->flags)) |
cc94015a | 4736 | s->to_fill++; |
acfe726b | 4737 | else if (dev->toread) |
cc94015a | 4738 | s->to_read++; |
16a53ecc | 4739 | if (dev->towrite) { |
cc94015a | 4740 | s->to_write++; |
16a53ecc | 4741 | if (!test_bit(R5_OVERWRITE, &dev->flags)) |
cc94015a | 4742 | s->non_overwrite++; |
16a53ecc | 4743 | } |
a4456856 | 4744 | if (dev->written) |
cc94015a | 4745 | s->written++; |
14a75d3e N |
4746 | /* Prefer to use the replacement for reads, but only |
4747 | * if it is recovered enough and has no bad blocks. | |
4748 | */ | |
4749 | rdev = rcu_dereference(conf->disks[i].replacement); | |
4750 | if (rdev && !test_bit(Faulty, &rdev->flags) && | |
c911c46c YY |
4751 | rdev->recovery_offset >= sh->sector + RAID5_STRIPE_SECTORS(conf) && |
4752 | !is_badblock(rdev, sh->sector, RAID5_STRIPE_SECTORS(conf), | |
14a75d3e N |
4753 | &first_bad, &bad_sectors)) |
4754 | set_bit(R5_ReadRepl, &dev->flags); | |
4755 | else { | |
e6030cb0 | 4756 | if (rdev && !test_bit(Faulty, &rdev->flags)) |
9a3e1101 | 4757 | set_bit(R5_NeedReplace, &dev->flags); |
e6030cb0 N |
4758 | else |
4759 | clear_bit(R5_NeedReplace, &dev->flags); | |
14a75d3e N |
4760 | rdev = rcu_dereference(conf->disks[i].rdev); |
4761 | clear_bit(R5_ReadRepl, &dev->flags); | |
4762 | } | |
9283d8c5 N |
4763 | if (rdev && test_bit(Faulty, &rdev->flags)) |
4764 | rdev = NULL; | |
31c176ec | 4765 | if (rdev) { |
c911c46c | 4766 | is_bad = is_badblock(rdev, sh->sector, RAID5_STRIPE_SECTORS(conf), |
31c176ec N |
4767 | &first_bad, &bad_sectors); |
4768 | if (s->blocked_rdev == NULL | |
4769 | && (test_bit(Blocked, &rdev->flags) | |
4770 | || is_bad < 0)) { | |
4771 | if (is_bad < 0) | |
4772 | set_bit(BlockedBadBlocks, | |
4773 | &rdev->flags); | |
4774 | s->blocked_rdev = rdev; | |
4775 | atomic_inc(&rdev->nr_pending); | |
4776 | } | |
6bfe0b49 | 4777 | } |
415e72d0 N |
4778 | clear_bit(R5_Insync, &dev->flags); |
4779 | if (!rdev) | |
4780 | /* Not in-sync */; | |
31c176ec N |
4781 | else if (is_bad) { |
4782 | /* also not in-sync */ | |
18b9837e N |
4783 | if (!test_bit(WriteErrorSeen, &rdev->flags) && |
4784 | test_bit(R5_UPTODATE, &dev->flags)) { | |
31c176ec N |
4785 | /* treat as in-sync, but with a read error |
4786 | * which we can now try to correct | |
4787 | */ | |
4788 | set_bit(R5_Insync, &dev->flags); | |
4789 | set_bit(R5_ReadError, &dev->flags); | |
4790 | } | |
4791 | } else if (test_bit(In_sync, &rdev->flags)) | |
415e72d0 | 4792 | set_bit(R5_Insync, &dev->flags); |
c911c46c | 4793 | else if (sh->sector + RAID5_STRIPE_SECTORS(conf) <= rdev->recovery_offset) |
415e72d0 | 4794 | /* in sync if before recovery_offset */ |
30d7a483 N |
4795 | set_bit(R5_Insync, &dev->flags); |
4796 | else if (test_bit(R5_UPTODATE, &dev->flags) && | |
4797 | test_bit(R5_Expanded, &dev->flags)) | |
4798 | /* If we've reshaped into here, we assume it is Insync. | |
4799 | * We will shortly update recovery_offset to make | |
4800 | * it official. | |
4801 | */ | |
4802 | set_bit(R5_Insync, &dev->flags); | |
4803 | ||
1cc03eb9 | 4804 | if (test_bit(R5_WriteError, &dev->flags)) { |
14a75d3e N |
4805 | /* This flag does not apply to '.replacement' |
4806 | * only to .rdev, so make sure to check that*/ | |
4807 | struct md_rdev *rdev2 = rcu_dereference( | |
4808 | conf->disks[i].rdev); | |
4809 | if (rdev2 == rdev) | |
4810 | clear_bit(R5_Insync, &dev->flags); | |
4811 | if (rdev2 && !test_bit(Faulty, &rdev2->flags)) { | |
bc2607f3 | 4812 | s->handle_bad_blocks = 1; |
14a75d3e | 4813 | atomic_inc(&rdev2->nr_pending); |
bc2607f3 N |
4814 | } else |
4815 | clear_bit(R5_WriteError, &dev->flags); | |
4816 | } | |
1cc03eb9 | 4817 | if (test_bit(R5_MadeGood, &dev->flags)) { |
14a75d3e N |
4818 | /* This flag does not apply to '.replacement' |
4819 | * only to .rdev, so make sure to check that*/ | |
4820 | struct md_rdev *rdev2 = rcu_dereference( | |
4821 | conf->disks[i].rdev); | |
4822 | if (rdev2 && !test_bit(Faulty, &rdev2->flags)) { | |
b84db560 | 4823 | s->handle_bad_blocks = 1; |
14a75d3e | 4824 | atomic_inc(&rdev2->nr_pending); |
b84db560 N |
4825 | } else |
4826 | clear_bit(R5_MadeGood, &dev->flags); | |
4827 | } | |
977df362 N |
4828 | if (test_bit(R5_MadeGoodRepl, &dev->flags)) { |
4829 | struct md_rdev *rdev2 = rcu_dereference( | |
4830 | conf->disks[i].replacement); | |
4831 | if (rdev2 && !test_bit(Faulty, &rdev2->flags)) { | |
4832 | s->handle_bad_blocks = 1; | |
4833 | atomic_inc(&rdev2->nr_pending); | |
4834 | } else | |
4835 | clear_bit(R5_MadeGoodRepl, &dev->flags); | |
4836 | } | |
415e72d0 | 4837 | if (!test_bit(R5_Insync, &dev->flags)) { |
16a53ecc N |
4838 | /* The ReadError flag will just be confusing now */ |
4839 | clear_bit(R5_ReadError, &dev->flags); | |
4840 | clear_bit(R5_ReWrite, &dev->flags); | |
1da177e4 | 4841 | } |
415e72d0 N |
4842 | if (test_bit(R5_ReadError, &dev->flags)) |
4843 | clear_bit(R5_Insync, &dev->flags); | |
4844 | if (!test_bit(R5_Insync, &dev->flags)) { | |
cc94015a N |
4845 | if (s->failed < 2) |
4846 | s->failed_num[s->failed] = i; | |
4847 | s->failed++; | |
9a3e1101 N |
4848 | if (rdev && !test_bit(Faulty, &rdev->flags)) |
4849 | do_recovery = 1; | |
d63e2fc8 BC |
4850 | else if (!rdev) { |
4851 | rdev = rcu_dereference( | |
4852 | conf->disks[i].replacement); | |
4853 | if (rdev && !test_bit(Faulty, &rdev->flags)) | |
4854 | do_recovery = 1; | |
4855 | } | |
415e72d0 | 4856 | } |
2ded3703 SL |
4857 | |
4858 | if (test_bit(R5_InJournal, &dev->flags)) | |
4859 | s->injournal++; | |
1e6d690b SL |
4860 | if (test_bit(R5_InJournal, &dev->flags) && dev->written) |
4861 | s->just_cached++; | |
1da177e4 | 4862 | } |
9a3e1101 N |
4863 | if (test_bit(STRIPE_SYNCING, &sh->state)) { |
4864 | /* If there is a failed device being replaced, | |
4865 | * we must be recovering. | |
4866 | * else if we are after recovery_cp, we must be syncing | |
c6d2e084 | 4867 | * else if MD_RECOVERY_REQUESTED is set, we also are syncing. |
9a3e1101 N |
4868 | * else we can only be replacing |
4869 | * sync and recovery both need to read all devices, and so | |
4870 | * use the same flag. | |
4871 | */ | |
4872 | if (do_recovery || | |
c6d2e084 | 4873 | sh->sector >= conf->mddev->recovery_cp || |
4874 | test_bit(MD_RECOVERY_REQUESTED, &(conf->mddev->recovery))) | |
9a3e1101 N |
4875 | s->syncing = 1; |
4876 | else | |
4877 | s->replacing = 1; | |
4878 | } | |
1da177e4 | 4879 | rcu_read_unlock(); |
cc94015a N |
4880 | } |
4881 | ||
cb9902db GJ |
4882 | /* |
4883 | * Return '1' if this is a member of batch, or '0' if it is a lone stripe or | |
4884 | * a head which can now be handled. | |
4885 | */ | |
59fc630b | 4886 | static int clear_batch_ready(struct stripe_head *sh) |
4887 | { | |
4888 | struct stripe_head *tmp; | |
4889 | if (!test_and_clear_bit(STRIPE_BATCH_READY, &sh->state)) | |
b15a9dbd | 4890 | return (sh->batch_head && sh->batch_head != sh); |
59fc630b | 4891 | spin_lock(&sh->stripe_lock); |
4892 | if (!sh->batch_head) { | |
4893 | spin_unlock(&sh->stripe_lock); | |
4894 | return 0; | |
4895 | } | |
4896 | ||
4897 | /* | |
4898 | * this stripe could be added to a batch list before we check | |
4899 | * BATCH_READY, skips it | |
4900 | */ | |
4901 | if (sh->batch_head != sh) { | |
4902 | spin_unlock(&sh->stripe_lock); | |
4903 | return 1; | |
4904 | } | |
4905 | spin_lock(&sh->batch_lock); | |
4906 | list_for_each_entry(tmp, &sh->batch_list, batch_list) | |
4907 | clear_bit(STRIPE_BATCH_READY, &tmp->state); | |
4908 | spin_unlock(&sh->batch_lock); | |
4909 | spin_unlock(&sh->stripe_lock); | |
4910 | ||
4911 | /* | |
4912 | * BATCH_READY is cleared, no new stripes can be added. | |
4913 | * batch_list can be accessed without lock | |
4914 | */ | |
4915 | return 0; | |
4916 | } | |
4917 | ||
3960ce79 N |
4918 | static void break_stripe_batch_list(struct stripe_head *head_sh, |
4919 | unsigned long handle_flags) | |
72ac7330 | 4920 | { |
4e3d62ff | 4921 | struct stripe_head *sh, *next; |
72ac7330 | 4922 | int i; |
fb642b92 | 4923 | int do_wakeup = 0; |
72ac7330 | 4924 | |
bb27051f N |
4925 | list_for_each_entry_safe(sh, next, &head_sh->batch_list, batch_list) { |
4926 | ||
72ac7330 | 4927 | list_del_init(&sh->batch_list); |
4928 | ||
fb3229d5 | 4929 | WARN_ONCE(sh->state & ((1 << STRIPE_ACTIVE) | |
1b956f7a N |
4930 | (1 << STRIPE_SYNCING) | |
4931 | (1 << STRIPE_REPLACED) | | |
1b956f7a N |
4932 | (1 << STRIPE_DELAYED) | |
4933 | (1 << STRIPE_BIT_DELAY) | | |
4934 | (1 << STRIPE_FULL_WRITE) | | |
4935 | (1 << STRIPE_BIOFILL_RUN) | | |
4936 | (1 << STRIPE_COMPUTE_RUN) | | |
1b956f7a N |
4937 | (1 << STRIPE_DISCARD) | |
4938 | (1 << STRIPE_BATCH_READY) | | |
4939 | (1 << STRIPE_BATCH_ERR) | | |
fb3229d5 SL |
4940 | (1 << STRIPE_BITMAP_PENDING)), |
4941 | "stripe state: %lx\n", sh->state); | |
4942 | WARN_ONCE(head_sh->state & ((1 << STRIPE_DISCARD) | | |
4943 | (1 << STRIPE_REPLACED)), | |
4944 | "head stripe state: %lx\n", head_sh->state); | |
1b956f7a N |
4945 | |
4946 | set_mask_bits(&sh->state, ~(STRIPE_EXPAND_SYNC_FLAGS | | |
550da24f | 4947 | (1 << STRIPE_PREREAD_ACTIVE) | |
184a09eb DY |
4948 | (1 << STRIPE_DEGRADED) | |
4949 | (1 << STRIPE_ON_UNPLUG_LIST)), | |
1b956f7a N |
4950 | head_sh->state & (1 << STRIPE_INSYNC)); |
4951 | ||
72ac7330 | 4952 | sh->check_state = head_sh->check_state; |
4953 | sh->reconstruct_state = head_sh->reconstruct_state; | |
448ec638 AC |
4954 | spin_lock_irq(&sh->stripe_lock); |
4955 | sh->batch_head = NULL; | |
4956 | spin_unlock_irq(&sh->stripe_lock); | |
fb642b92 N |
4957 | for (i = 0; i < sh->disks; i++) { |
4958 | if (test_and_clear_bit(R5_Overlap, &sh->dev[i].flags)) | |
4959 | do_wakeup = 1; | |
72ac7330 | 4960 | sh->dev[i].flags = head_sh->dev[i].flags & |
4961 | (~((1 << R5_WriteError) | (1 << R5_Overlap))); | |
fb642b92 | 4962 | } |
3960ce79 N |
4963 | if (handle_flags == 0 || |
4964 | sh->state & handle_flags) | |
4965 | set_bit(STRIPE_HANDLE, &sh->state); | |
6d036f7d | 4966 | raid5_release_stripe(sh); |
72ac7330 | 4967 | } |
fb642b92 N |
4968 | spin_lock_irq(&head_sh->stripe_lock); |
4969 | head_sh->batch_head = NULL; | |
4970 | spin_unlock_irq(&head_sh->stripe_lock); | |
4971 | for (i = 0; i < head_sh->disks; i++) | |
4972 | if (test_and_clear_bit(R5_Overlap, &head_sh->dev[i].flags)) | |
4973 | do_wakeup = 1; | |
3960ce79 N |
4974 | if (head_sh->state & handle_flags) |
4975 | set_bit(STRIPE_HANDLE, &head_sh->state); | |
fb642b92 N |
4976 | |
4977 | if (do_wakeup) | |
4978 | wake_up(&head_sh->raid_conf->wait_for_overlap); | |
72ac7330 | 4979 | } |
4980 | ||
cc94015a N |
4981 | static void handle_stripe(struct stripe_head *sh) |
4982 | { | |
4983 | struct stripe_head_state s; | |
d1688a6d | 4984 | struct r5conf *conf = sh->raid_conf; |
3687c061 | 4985 | int i; |
84789554 N |
4986 | int prexor; |
4987 | int disks = sh->disks; | |
474af965 | 4988 | struct r5dev *pdev, *qdev; |
cc94015a N |
4989 | |
4990 | clear_bit(STRIPE_HANDLE, &sh->state); | |
a377a472 GJ |
4991 | |
4992 | /* | |
4993 | * handle_stripe should not continue handle the batched stripe, only | |
4994 | * the head of batch list or lone stripe can continue. Otherwise we | |
4995 | * could see break_stripe_batch_list warns about the STRIPE_ACTIVE | |
4996 | * is set for the batched stripe. | |
4997 | */ | |
4998 | if (clear_batch_ready(sh)) | |
4999 | return; | |
5000 | ||
257a4b42 | 5001 | if (test_and_set_bit_lock(STRIPE_ACTIVE, &sh->state)) { |
cc94015a N |
5002 | /* already being handled, ensure it gets handled |
5003 | * again when current action finishes */ | |
5004 | set_bit(STRIPE_HANDLE, &sh->state); | |
5005 | return; | |
5006 | } | |
5007 | ||
4e3d62ff | 5008 | if (test_and_clear_bit(STRIPE_BATCH_ERR, &sh->state)) |
3960ce79 | 5009 | break_stripe_batch_list(sh, 0); |
72ac7330 | 5010 | |
dabc4ec6 | 5011 | if (test_bit(STRIPE_SYNC_REQUESTED, &sh->state) && !sh->batch_head) { |
f8dfcffd | 5012 | spin_lock(&sh->stripe_lock); |
5ddf0440 SL |
5013 | /* |
5014 | * Cannot process 'sync' concurrently with 'discard'. | |
5015 | * Flush data in r5cache before 'sync'. | |
5016 | */ | |
5017 | if (!test_bit(STRIPE_R5C_PARTIAL_STRIPE, &sh->state) && | |
5018 | !test_bit(STRIPE_R5C_FULL_STRIPE, &sh->state) && | |
5019 | !test_bit(STRIPE_DISCARD, &sh->state) && | |
f8dfcffd N |
5020 | test_and_clear_bit(STRIPE_SYNC_REQUESTED, &sh->state)) { |
5021 | set_bit(STRIPE_SYNCING, &sh->state); | |
5022 | clear_bit(STRIPE_INSYNC, &sh->state); | |
f94c0b66 | 5023 | clear_bit(STRIPE_REPLACED, &sh->state); |
f8dfcffd N |
5024 | } |
5025 | spin_unlock(&sh->stripe_lock); | |
cc94015a N |
5026 | } |
5027 | clear_bit(STRIPE_DELAYED, &sh->state); | |
5028 | ||
5029 | pr_debug("handling stripe %llu, state=%#lx cnt=%d, " | |
5030 | "pd_idx=%d, qd_idx=%d\n, check:%d, reconstruct:%d\n", | |
5031 | (unsigned long long)sh->sector, sh->state, | |
5032 | atomic_read(&sh->count), sh->pd_idx, sh->qd_idx, | |
5033 | sh->check_state, sh->reconstruct_state); | |
3687c061 | 5034 | |
acfe726b | 5035 | analyse_stripe(sh, &s); |
c5a31000 | 5036 | |
b70abcb2 SL |
5037 | if (test_bit(STRIPE_LOG_TRAPPED, &sh->state)) |
5038 | goto finish; | |
5039 | ||
16d997b7 N |
5040 | if (s.handle_bad_blocks || |
5041 | test_bit(MD_SB_CHANGE_PENDING, &conf->mddev->sb_flags)) { | |
bc2607f3 N |
5042 | set_bit(STRIPE_HANDLE, &sh->state); |
5043 | goto finish; | |
5044 | } | |
5045 | ||
474af965 N |
5046 | if (unlikely(s.blocked_rdev)) { |
5047 | if (s.syncing || s.expanding || s.expanded || | |
9a3e1101 | 5048 | s.replacing || s.to_write || s.written) { |
474af965 N |
5049 | set_bit(STRIPE_HANDLE, &sh->state); |
5050 | goto finish; | |
5051 | } | |
5052 | /* There is nothing for the blocked_rdev to block */ | |
5053 | rdev_dec_pending(s.blocked_rdev, conf->mddev); | |
5054 | s.blocked_rdev = NULL; | |
5055 | } | |
5056 | ||
5057 | if (s.to_fill && !test_bit(STRIPE_BIOFILL_RUN, &sh->state)) { | |
5058 | set_bit(STRIPE_OP_BIOFILL, &s.ops_request); | |
5059 | set_bit(STRIPE_BIOFILL_RUN, &sh->state); | |
5060 | } | |
5061 | ||
5062 | pr_debug("locked=%d uptodate=%d to_read=%d" | |
5063 | " to_write=%d failed=%d failed_num=%d,%d\n", | |
5064 | s.locked, s.uptodate, s.to_read, s.to_write, s.failed, | |
5065 | s.failed_num[0], s.failed_num[1]); | |
70d466f7 SL |
5066 | /* |
5067 | * check if the array has lost more than max_degraded devices and, | |
474af965 | 5068 | * if so, some requests might need to be failed. |
70d466f7 SL |
5069 | * |
5070 | * When journal device failed (log_failed), we will only process | |
5071 | * the stripe if there is data need write to raid disks | |
474af965 | 5072 | */ |
70d466f7 SL |
5073 | if (s.failed > conf->max_degraded || |
5074 | (s.log_failed && s.injournal == 0)) { | |
9a3f530f N |
5075 | sh->check_state = 0; |
5076 | sh->reconstruct_state = 0; | |
626f2092 | 5077 | break_stripe_batch_list(sh, 0); |
9a3f530f | 5078 | if (s.to_read+s.to_write+s.written) |
bd83d0a2 | 5079 | handle_failed_stripe(conf, sh, &s, disks); |
9a3e1101 | 5080 | if (s.syncing + s.replacing) |
9a3f530f N |
5081 | handle_failed_sync(conf, sh, &s); |
5082 | } | |
474af965 | 5083 | |
84789554 N |
5084 | /* Now we check to see if any write operations have recently |
5085 | * completed | |
5086 | */ | |
5087 | prexor = 0; | |
5088 | if (sh->reconstruct_state == reconstruct_state_prexor_drain_result) | |
5089 | prexor = 1; | |
5090 | if (sh->reconstruct_state == reconstruct_state_drain_result || | |
5091 | sh->reconstruct_state == reconstruct_state_prexor_drain_result) { | |
5092 | sh->reconstruct_state = reconstruct_state_idle; | |
5093 | ||
5094 | /* All the 'written' buffers and the parity block are ready to | |
5095 | * be written back to disk | |
5096 | */ | |
9e444768 SL |
5097 | BUG_ON(!test_bit(R5_UPTODATE, &sh->dev[sh->pd_idx].flags) && |
5098 | !test_bit(R5_Discard, &sh->dev[sh->pd_idx].flags)); | |
84789554 | 5099 | BUG_ON(sh->qd_idx >= 0 && |
9e444768 SL |
5100 | !test_bit(R5_UPTODATE, &sh->dev[sh->qd_idx].flags) && |
5101 | !test_bit(R5_Discard, &sh->dev[sh->qd_idx].flags)); | |
84789554 N |
5102 | for (i = disks; i--; ) { |
5103 | struct r5dev *dev = &sh->dev[i]; | |
5104 | if (test_bit(R5_LOCKED, &dev->flags) && | |
5105 | (i == sh->pd_idx || i == sh->qd_idx || | |
1e6d690b SL |
5106 | dev->written || test_bit(R5_InJournal, |
5107 | &dev->flags))) { | |
84789554 N |
5108 | pr_debug("Writing block %d\n", i); |
5109 | set_bit(R5_Wantwrite, &dev->flags); | |
5110 | if (prexor) | |
5111 | continue; | |
9c4bdf69 N |
5112 | if (s.failed > 1) |
5113 | continue; | |
84789554 N |
5114 | if (!test_bit(R5_Insync, &dev->flags) || |
5115 | ((i == sh->pd_idx || i == sh->qd_idx) && | |
5116 | s.failed == 0)) | |
5117 | set_bit(STRIPE_INSYNC, &sh->state); | |
5118 | } | |
5119 | } | |
5120 | if (test_and_clear_bit(STRIPE_PREREAD_ACTIVE, &sh->state)) | |
5121 | s.dec_preread_active = 1; | |
5122 | } | |
5123 | ||
ef5b7c69 N |
5124 | /* |
5125 | * might be able to return some write requests if the parity blocks | |
5126 | * are safe, or on a failed drive | |
5127 | */ | |
5128 | pdev = &sh->dev[sh->pd_idx]; | |
5129 | s.p_failed = (s.failed >= 1 && s.failed_num[0] == sh->pd_idx) | |
5130 | || (s.failed >= 2 && s.failed_num[1] == sh->pd_idx); | |
5131 | qdev = &sh->dev[sh->qd_idx]; | |
5132 | s.q_failed = (s.failed >= 1 && s.failed_num[0] == sh->qd_idx) | |
5133 | || (s.failed >= 2 && s.failed_num[1] == sh->qd_idx) | |
5134 | || conf->level < 6; | |
5135 | ||
5136 | if (s.written && | |
5137 | (s.p_failed || ((test_bit(R5_Insync, &pdev->flags) | |
5138 | && !test_bit(R5_LOCKED, &pdev->flags) | |
5139 | && (test_bit(R5_UPTODATE, &pdev->flags) || | |
5140 | test_bit(R5_Discard, &pdev->flags))))) && | |
5141 | (s.q_failed || ((test_bit(R5_Insync, &qdev->flags) | |
5142 | && !test_bit(R5_LOCKED, &qdev->flags) | |
5143 | && (test_bit(R5_UPTODATE, &qdev->flags) || | |
5144 | test_bit(R5_Discard, &qdev->flags)))))) | |
bd83d0a2 | 5145 | handle_stripe_clean_event(conf, sh, disks); |
ef5b7c69 | 5146 | |
1e6d690b | 5147 | if (s.just_cached) |
bd83d0a2 | 5148 | r5c_handle_cached_data_endio(conf, sh, disks); |
ff875738 | 5149 | log_stripe_write_finished(sh); |
1e6d690b | 5150 | |
ef5b7c69 N |
5151 | /* Now we might consider reading some blocks, either to check/generate |
5152 | * parity, or to satisfy requests | |
5153 | * or to load a block that is being partially written. | |
5154 | */ | |
5155 | if (s.to_read || s.non_overwrite | |
a1c6ae3d | 5156 | || (s.to_write && s.failed) |
ef5b7c69 N |
5157 | || (s.syncing && (s.uptodate + s.compute < disks)) |
5158 | || s.replacing | |
5159 | || s.expanding) | |
5160 | handle_stripe_fill(sh, &s, disks); | |
5161 | ||
2ded3703 SL |
5162 | /* |
5163 | * When the stripe finishes full journal write cycle (write to journal | |
5164 | * and raid disk), this is the clean up procedure so it is ready for | |
5165 | * next operation. | |
5166 | */ | |
5167 | r5c_finish_stripe_write_out(conf, sh, &s); | |
5168 | ||
5169 | /* | |
5170 | * Now to consider new write requests, cache write back and what else, | |
5171 | * if anything should be read. We do not handle new writes when: | |
84789554 N |
5172 | * 1/ A 'write' operation (copy+xor) is already in flight. |
5173 | * 2/ A 'check' operation is in flight, as it may clobber the parity | |
5174 | * block. | |
2ded3703 | 5175 | * 3/ A r5c cache log write is in flight. |
84789554 | 5176 | */ |
2ded3703 SL |
5177 | |
5178 | if (!sh->reconstruct_state && !sh->check_state && !sh->log_io) { | |
5179 | if (!r5c_is_writeback(conf->log)) { | |
5180 | if (s.to_write) | |
5181 | handle_stripe_dirtying(conf, sh, &s, disks); | |
5182 | } else { /* write back cache */ | |
5183 | int ret = 0; | |
5184 | ||
5185 | /* First, try handle writes in caching phase */ | |
5186 | if (s.to_write) | |
5187 | ret = r5c_try_caching_write(conf, sh, &s, | |
5188 | disks); | |
5189 | /* | |
5190 | * If caching phase failed: ret == -EAGAIN | |
5191 | * OR | |
5192 | * stripe under reclaim: !caching && injournal | |
5193 | * | |
5194 | * fall back to handle_stripe_dirtying() | |
5195 | */ | |
5196 | if (ret == -EAGAIN || | |
5197 | /* stripe under reclaim: !caching && injournal */ | |
5198 | (!test_bit(STRIPE_R5C_CACHING, &sh->state) && | |
d7bd398e SL |
5199 | s.injournal > 0)) { |
5200 | ret = handle_stripe_dirtying(conf, sh, &s, | |
5201 | disks); | |
5202 | if (ret == -EAGAIN) | |
5203 | goto finish; | |
5204 | } | |
2ded3703 SL |
5205 | } |
5206 | } | |
84789554 N |
5207 | |
5208 | /* maybe we need to check and possibly fix the parity for this stripe | |
5209 | * Any reads will already have been scheduled, so we just see if enough | |
5210 | * data is available. The parity check is held off while parity | |
5211 | * dependent operations are in flight. | |
5212 | */ | |
5213 | if (sh->check_state || | |
5214 | (s.syncing && s.locked == 0 && | |
5215 | !test_bit(STRIPE_COMPUTE_RUN, &sh->state) && | |
5216 | !test_bit(STRIPE_INSYNC, &sh->state))) { | |
5217 | if (conf->level == 6) | |
5218 | handle_parity_checks6(conf, sh, &s, disks); | |
5219 | else | |
5220 | handle_parity_checks5(conf, sh, &s, disks); | |
5221 | } | |
c5a31000 | 5222 | |
f94c0b66 N |
5223 | if ((s.replacing || s.syncing) && s.locked == 0 |
5224 | && !test_bit(STRIPE_COMPUTE_RUN, &sh->state) | |
5225 | && !test_bit(STRIPE_REPLACED, &sh->state)) { | |
9a3e1101 N |
5226 | /* Write out to replacement devices where possible */ |
5227 | for (i = 0; i < conf->raid_disks; i++) | |
f94c0b66 N |
5228 | if (test_bit(R5_NeedReplace, &sh->dev[i].flags)) { |
5229 | WARN_ON(!test_bit(R5_UPTODATE, &sh->dev[i].flags)); | |
9a3e1101 N |
5230 | set_bit(R5_WantReplace, &sh->dev[i].flags); |
5231 | set_bit(R5_LOCKED, &sh->dev[i].flags); | |
5232 | s.locked++; | |
5233 | } | |
f94c0b66 N |
5234 | if (s.replacing) |
5235 | set_bit(STRIPE_INSYNC, &sh->state); | |
5236 | set_bit(STRIPE_REPLACED, &sh->state); | |
9a3e1101 N |
5237 | } |
5238 | if ((s.syncing || s.replacing) && s.locked == 0 && | |
f94c0b66 | 5239 | !test_bit(STRIPE_COMPUTE_RUN, &sh->state) && |
9a3e1101 | 5240 | test_bit(STRIPE_INSYNC, &sh->state)) { |
c911c46c | 5241 | md_done_sync(conf->mddev, RAID5_STRIPE_SECTORS(conf), 1); |
c5a31000 | 5242 | clear_bit(STRIPE_SYNCING, &sh->state); |
f8dfcffd N |
5243 | if (test_and_clear_bit(R5_Overlap, &sh->dev[sh->pd_idx].flags)) |
5244 | wake_up(&conf->wait_for_overlap); | |
c5a31000 N |
5245 | } |
5246 | ||
5247 | /* If the failed drives are just a ReadError, then we might need | |
5248 | * to progress the repair/check process | |
5249 | */ | |
5250 | if (s.failed <= conf->max_degraded && !conf->mddev->ro) | |
5251 | for (i = 0; i < s.failed; i++) { | |
5252 | struct r5dev *dev = &sh->dev[s.failed_num[i]]; | |
5253 | if (test_bit(R5_ReadError, &dev->flags) | |
5254 | && !test_bit(R5_LOCKED, &dev->flags) | |
5255 | && test_bit(R5_UPTODATE, &dev->flags) | |
5256 | ) { | |
5257 | if (!test_bit(R5_ReWrite, &dev->flags)) { | |
5258 | set_bit(R5_Wantwrite, &dev->flags); | |
5259 | set_bit(R5_ReWrite, &dev->flags); | |
3a31cf3d | 5260 | } else |
c5a31000 N |
5261 | /* let's read it back */ |
5262 | set_bit(R5_Wantread, &dev->flags); | |
3a31cf3d GJ |
5263 | set_bit(R5_LOCKED, &dev->flags); |
5264 | s.locked++; | |
c5a31000 N |
5265 | } |
5266 | } | |
5267 | ||
3687c061 N |
5268 | /* Finish reconstruct operations initiated by the expansion process */ |
5269 | if (sh->reconstruct_state == reconstruct_state_result) { | |
5270 | struct stripe_head *sh_src | |
2f2d51ef LG |
5271 | = raid5_get_active_stripe(conf, NULL, sh->sector, |
5272 | R5_GAS_PREVIOUS | R5_GAS_NOBLOCK | | |
5273 | R5_GAS_NOQUIESCE); | |
3687c061 N |
5274 | if (sh_src && test_bit(STRIPE_EXPAND_SOURCE, &sh_src->state)) { |
5275 | /* sh cannot be written until sh_src has been read. | |
5276 | * so arrange for sh to be delayed a little | |
5277 | */ | |
5278 | set_bit(STRIPE_DELAYED, &sh->state); | |
5279 | set_bit(STRIPE_HANDLE, &sh->state); | |
5280 | if (!test_and_set_bit(STRIPE_PREREAD_ACTIVE, | |
5281 | &sh_src->state)) | |
5282 | atomic_inc(&conf->preread_active_stripes); | |
6d036f7d | 5283 | raid5_release_stripe(sh_src); |
3687c061 N |
5284 | goto finish; |
5285 | } | |
5286 | if (sh_src) | |
6d036f7d | 5287 | raid5_release_stripe(sh_src); |
3687c061 N |
5288 | |
5289 | sh->reconstruct_state = reconstruct_state_idle; | |
5290 | clear_bit(STRIPE_EXPANDING, &sh->state); | |
5291 | for (i = conf->raid_disks; i--; ) { | |
5292 | set_bit(R5_Wantwrite, &sh->dev[i].flags); | |
5293 | set_bit(R5_LOCKED, &sh->dev[i].flags); | |
5294 | s.locked++; | |
5295 | } | |
5296 | } | |
f416885e | 5297 | |
3687c061 N |
5298 | if (s.expanded && test_bit(STRIPE_EXPANDING, &sh->state) && |
5299 | !sh->reconstruct_state) { | |
5300 | /* Need to write out all blocks after computing parity */ | |
5301 | sh->disks = conf->raid_disks; | |
5302 | stripe_set_idx(sh->sector, conf, 0, sh); | |
5303 | schedule_reconstruction(sh, &s, 1, 1); | |
5304 | } else if (s.expanded && !sh->reconstruct_state && s.locked == 0) { | |
5305 | clear_bit(STRIPE_EXPAND_READY, &sh->state); | |
5306 | atomic_dec(&conf->reshape_stripes); | |
5307 | wake_up(&conf->wait_for_overlap); | |
c911c46c | 5308 | md_done_sync(conf->mddev, RAID5_STRIPE_SECTORS(conf), 1); |
3687c061 N |
5309 | } |
5310 | ||
5311 | if (s.expanding && s.locked == 0 && | |
5312 | !test_bit(STRIPE_COMPUTE_RUN, &sh->state)) | |
5313 | handle_stripe_expansion(conf, sh); | |
16a53ecc | 5314 | |
3687c061 | 5315 | finish: |
6bfe0b49 | 5316 | /* wait for this device to become unblocked */ |
5f066c63 N |
5317 | if (unlikely(s.blocked_rdev)) { |
5318 | if (conf->mddev->external) | |
5319 | md_wait_for_blocked_rdev(s.blocked_rdev, | |
5320 | conf->mddev); | |
5321 | else | |
5322 | /* Internal metadata will immediately | |
5323 | * be written by raid5d, so we don't | |
5324 | * need to wait here. | |
5325 | */ | |
5326 | rdev_dec_pending(s.blocked_rdev, | |
5327 | conf->mddev); | |
5328 | } | |
6bfe0b49 | 5329 | |
bc2607f3 N |
5330 | if (s.handle_bad_blocks) |
5331 | for (i = disks; i--; ) { | |
3cb03002 | 5332 | struct md_rdev *rdev; |
bc2607f3 N |
5333 | struct r5dev *dev = &sh->dev[i]; |
5334 | if (test_and_clear_bit(R5_WriteError, &dev->flags)) { | |
5335 | /* We own a safe reference to the rdev */ | |
e38b0432 | 5336 | rdev = rdev_pend_deref(conf->disks[i].rdev); |
bc2607f3 | 5337 | if (!rdev_set_badblocks(rdev, sh->sector, |
c911c46c | 5338 | RAID5_STRIPE_SECTORS(conf), 0)) |
bc2607f3 N |
5339 | md_error(conf->mddev, rdev); |
5340 | rdev_dec_pending(rdev, conf->mddev); | |
5341 | } | |
b84db560 | 5342 | if (test_and_clear_bit(R5_MadeGood, &dev->flags)) { |
e38b0432 | 5343 | rdev = rdev_pend_deref(conf->disks[i].rdev); |
b84db560 | 5344 | rdev_clear_badblocks(rdev, sh->sector, |
c911c46c | 5345 | RAID5_STRIPE_SECTORS(conf), 0); |
b84db560 N |
5346 | rdev_dec_pending(rdev, conf->mddev); |
5347 | } | |
977df362 | 5348 | if (test_and_clear_bit(R5_MadeGoodRepl, &dev->flags)) { |
e38b0432 | 5349 | rdev = rdev_pend_deref(conf->disks[i].replacement); |
dd054fce N |
5350 | if (!rdev) |
5351 | /* rdev have been moved down */ | |
e38b0432 | 5352 | rdev = rdev_pend_deref(conf->disks[i].rdev); |
977df362 | 5353 | rdev_clear_badblocks(rdev, sh->sector, |
c911c46c | 5354 | RAID5_STRIPE_SECTORS(conf), 0); |
977df362 N |
5355 | rdev_dec_pending(rdev, conf->mddev); |
5356 | } | |
bc2607f3 N |
5357 | } |
5358 | ||
6c0069c0 YT |
5359 | if (s.ops_request) |
5360 | raid_run_ops(sh, s.ops_request); | |
5361 | ||
f0e43bcd | 5362 | ops_run_io(sh, &s); |
16a53ecc | 5363 | |
c5709ef6 | 5364 | if (s.dec_preread_active) { |
729a1866 | 5365 | /* We delay this until after ops_run_io so that if make_request |
e9c7469b | 5366 | * is waiting on a flush, it won't continue until the writes |
729a1866 N |
5367 | * have actually been submitted. |
5368 | */ | |
5369 | atomic_dec(&conf->preread_active_stripes); | |
5370 | if (atomic_read(&conf->preread_active_stripes) < | |
5371 | IO_THRESHOLD) | |
5372 | md_wakeup_thread(conf->mddev->thread); | |
5373 | } | |
5374 | ||
257a4b42 | 5375 | clear_bit_unlock(STRIPE_ACTIVE, &sh->state); |
16a53ecc N |
5376 | } |
5377 | ||
d1688a6d | 5378 | static void raid5_activate_delayed(struct r5conf *conf) |
4631f39f | 5379 | __must_hold(&conf->device_lock) |
16a53ecc N |
5380 | { |
5381 | if (atomic_read(&conf->preread_active_stripes) < IO_THRESHOLD) { | |
5382 | while (!list_empty(&conf->delayed_list)) { | |
5383 | struct list_head *l = conf->delayed_list.next; | |
5384 | struct stripe_head *sh; | |
5385 | sh = list_entry(l, struct stripe_head, lru); | |
5386 | list_del_init(l); | |
5387 | clear_bit(STRIPE_DELAYED, &sh->state); | |
5388 | if (!test_and_set_bit(STRIPE_PREREAD_ACTIVE, &sh->state)) | |
5389 | atomic_inc(&conf->preread_active_stripes); | |
8b3e6cdc | 5390 | list_add_tail(&sh->lru, &conf->hold_list); |
851c30c9 | 5391 | raid5_wakeup_stripe_thread(sh); |
16a53ecc | 5392 | } |
482c0834 | 5393 | } |
16a53ecc N |
5394 | } |
5395 | ||
566c09c5 | 5396 | static void activate_bit_delay(struct r5conf *conf, |
4631f39f LG |
5397 | struct list_head *temp_inactive_list) |
5398 | __must_hold(&conf->device_lock) | |
16a53ecc | 5399 | { |
16a53ecc N |
5400 | struct list_head head; |
5401 | list_add(&head, &conf->bitmap_list); | |
5402 | list_del_init(&conf->bitmap_list); | |
5403 | while (!list_empty(&head)) { | |
5404 | struct stripe_head *sh = list_entry(head.next, struct stripe_head, lru); | |
566c09c5 | 5405 | int hash; |
16a53ecc N |
5406 | list_del_init(&sh->lru); |
5407 | atomic_inc(&sh->count); | |
566c09c5 SL |
5408 | hash = sh->hash_lock_index; |
5409 | __release_stripe(conf, sh, &temp_inactive_list[hash]); | |
16a53ecc N |
5410 | } |
5411 | } | |
5412 | ||
fd01b88c | 5413 | static int in_chunk_boundary(struct mddev *mddev, struct bio *bio) |
f679623f | 5414 | { |
3cb5edf4 | 5415 | struct r5conf *conf = mddev->private; |
10433d04 | 5416 | sector_t sector = bio->bi_iter.bi_sector; |
3cb5edf4 | 5417 | unsigned int chunk_sectors; |
aa8b57aa | 5418 | unsigned int bio_sectors = bio_sectors(bio); |
f679623f | 5419 | |
3cb5edf4 | 5420 | chunk_sectors = min(conf->chunk_sectors, conf->prev_chunk_sectors); |
f679623f RBJ |
5421 | return chunk_sectors >= |
5422 | ((sector & (chunk_sectors - 1)) + bio_sectors); | |
5423 | } | |
5424 | ||
46031f9a RBJ |
5425 | /* |
5426 | * add bio to the retry LIFO ( in O(1) ... we are in interrupt ) | |
5427 | * later sampled by raid5d. | |
5428 | */ | |
d1688a6d | 5429 | static void add_bio_to_retry(struct bio *bi,struct r5conf *conf) |
46031f9a RBJ |
5430 | { |
5431 | unsigned long flags; | |
5432 | ||
5433 | spin_lock_irqsave(&conf->device_lock, flags); | |
5434 | ||
5435 | bi->bi_next = conf->retry_read_aligned_list; | |
5436 | conf->retry_read_aligned_list = bi; | |
5437 | ||
5438 | spin_unlock_irqrestore(&conf->device_lock, flags); | |
5439 | md_wakeup_thread(conf->mddev->thread); | |
5440 | } | |
5441 | ||
0472a42b N |
5442 | static struct bio *remove_bio_from_retry(struct r5conf *conf, |
5443 | unsigned int *offset) | |
46031f9a RBJ |
5444 | { |
5445 | struct bio *bi; | |
5446 | ||
5447 | bi = conf->retry_read_aligned; | |
5448 | if (bi) { | |
0472a42b | 5449 | *offset = conf->retry_read_offset; |
46031f9a RBJ |
5450 | conf->retry_read_aligned = NULL; |
5451 | return bi; | |
5452 | } | |
5453 | bi = conf->retry_read_aligned_list; | |
5454 | if(bi) { | |
387bb173 | 5455 | conf->retry_read_aligned_list = bi->bi_next; |
46031f9a | 5456 | bi->bi_next = NULL; |
0472a42b | 5457 | *offset = 0; |
46031f9a RBJ |
5458 | } |
5459 | ||
5460 | return bi; | |
5461 | } | |
5462 | ||
f679623f RBJ |
5463 | /* |
5464 | * The "raid5_align_endio" should check if the read succeeded and if it | |
5465 | * did, call bio_endio on the original bio (having bio_put the new bio | |
5466 | * first). | |
5467 | * If the read failed.. | |
5468 | */ | |
4246a0b6 | 5469 | static void raid5_align_endio(struct bio *bi) |
f679623f | 5470 | { |
1147f58e GJ |
5471 | struct md_io_acct *md_io_acct = bi->bi_private; |
5472 | struct bio *raid_bi = md_io_acct->orig_bio; | |
fd01b88c | 5473 | struct mddev *mddev; |
d1688a6d | 5474 | struct r5conf *conf; |
3cb03002 | 5475 | struct md_rdev *rdev; |
4e4cbee9 | 5476 | blk_status_t error = bi->bi_status; |
1147f58e | 5477 | unsigned long start_time = md_io_acct->start_time; |
46031f9a | 5478 | |
f679623f | 5479 | bio_put(bi); |
46031f9a | 5480 | |
46031f9a RBJ |
5481 | rdev = (void*)raid_bi->bi_next; |
5482 | raid_bi->bi_next = NULL; | |
2b7f2228 N |
5483 | mddev = rdev->mddev; |
5484 | conf = mddev->private; | |
46031f9a RBJ |
5485 | |
5486 | rdev_dec_pending(rdev, conf->mddev); | |
5487 | ||
9b81c842 | 5488 | if (!error) { |
1147f58e GJ |
5489 | if (blk_queue_io_stat(raid_bi->bi_bdev->bd_disk->queue)) |
5490 | bio_end_io_acct(raid_bi, start_time); | |
4246a0b6 | 5491 | bio_endio(raid_bi); |
46031f9a | 5492 | if (atomic_dec_and_test(&conf->active_aligned_reads)) |
b1b46486 | 5493 | wake_up(&conf->wait_for_quiescent); |
6712ecf8 | 5494 | return; |
46031f9a RBJ |
5495 | } |
5496 | ||
45b4233c | 5497 | pr_debug("raid5_align_endio : io error...handing IO for a retry\n"); |
46031f9a RBJ |
5498 | |
5499 | add_bio_to_retry(raid_bi, conf); | |
f679623f RBJ |
5500 | } |
5501 | ||
7ef6b12a | 5502 | static int raid5_read_one_chunk(struct mddev *mddev, struct bio *raid_bio) |
f679623f | 5503 | { |
d1688a6d | 5504 | struct r5conf *conf = mddev->private; |
e82ed3a4 | 5505 | struct bio *align_bio; |
3cb03002 | 5506 | struct md_rdev *rdev; |
e82ed3a4 CH |
5507 | sector_t sector, end_sector, first_bad; |
5508 | int bad_sectors, dd_idx; | |
1147f58e | 5509 | struct md_io_acct *md_io_acct; |
97ae2725 | 5510 | bool did_inc; |
f679623f RBJ |
5511 | |
5512 | if (!in_chunk_boundary(mddev, raid_bio)) { | |
7ef6b12a | 5513 | pr_debug("%s: non aligned\n", __func__); |
f679623f RBJ |
5514 | return 0; |
5515 | } | |
f679623f | 5516 | |
e82ed3a4 CH |
5517 | sector = raid5_compute_sector(conf, raid_bio->bi_iter.bi_sector, 0, |
5518 | &dd_idx, NULL); | |
5519 | end_sector = bio_end_sector(raid_bio); | |
5520 | ||
f679623f | 5521 | rcu_read_lock(); |
e82ed3a4 CH |
5522 | if (r5c_big_stripe_cached(conf, sector)) |
5523 | goto out_rcu_unlock; | |
5524 | ||
671488cc N |
5525 | rdev = rcu_dereference(conf->disks[dd_idx].replacement); |
5526 | if (!rdev || test_bit(Faulty, &rdev->flags) || | |
5527 | rdev->recovery_offset < end_sector) { | |
5528 | rdev = rcu_dereference(conf->disks[dd_idx].rdev); | |
e82ed3a4 CH |
5529 | if (!rdev) |
5530 | goto out_rcu_unlock; | |
5531 | if (test_bit(Faulty, &rdev->flags) || | |
671488cc | 5532 | !(test_bit(In_sync, &rdev->flags) || |
e82ed3a4 CH |
5533 | rdev->recovery_offset >= end_sector)) |
5534 | goto out_rcu_unlock; | |
671488cc | 5535 | } |
03b047f4 | 5536 | |
e82ed3a4 CH |
5537 | atomic_inc(&rdev->nr_pending); |
5538 | rcu_read_unlock(); | |
5539 | ||
c82aa1b7 | 5540 | if (is_badblock(rdev, sector, bio_sectors(raid_bio), &first_bad, |
e82ed3a4 | 5541 | &bad_sectors)) { |
e82ed3a4 | 5542 | rdev_dec_pending(rdev, mddev); |
03b047f4 SL |
5543 | return 0; |
5544 | } | |
5545 | ||
abfc426d CH |
5546 | align_bio = bio_alloc_clone(rdev->bdev, raid_bio, GFP_NOIO, |
5547 | &mddev->io_acct_set); | |
1147f58e GJ |
5548 | md_io_acct = container_of(align_bio, struct md_io_acct, bio_clone); |
5549 | raid_bio->bi_next = (void *)rdev; | |
5550 | if (blk_queue_io_stat(raid_bio->bi_bdev->bd_disk->queue)) | |
5551 | md_io_acct->start_time = bio_start_io_acct(raid_bio); | |
5552 | md_io_acct->orig_bio = raid_bio; | |
5553 | ||
e82ed3a4 | 5554 | align_bio->bi_end_io = raid5_align_endio; |
1147f58e | 5555 | align_bio->bi_private = md_io_acct; |
e82ed3a4 CH |
5556 | align_bio->bi_iter.bi_sector = sector; |
5557 | ||
e82ed3a4 CH |
5558 | /* No reshape active, so we can trust rdev->data_offset */ |
5559 | align_bio->bi_iter.bi_sector += rdev->data_offset; | |
31c176ec | 5560 | |
97ae2725 GO |
5561 | did_inc = false; |
5562 | if (conf->quiesce == 0) { | |
5563 | atomic_inc(&conf->active_aligned_reads); | |
5564 | did_inc = true; | |
5565 | } | |
5566 | /* need a memory barrier to detect the race with raid5_quiesce() */ | |
5567 | if (!did_inc || smp_load_acquire(&conf->quiesce) != 0) { | |
5568 | /* quiesce is in progress, so we need to undo io activation and wait | |
5569 | * for it to finish | |
5570 | */ | |
5571 | if (did_inc && atomic_dec_and_test(&conf->active_aligned_reads)) | |
5572 | wake_up(&conf->wait_for_quiescent); | |
5573 | spin_lock_irq(&conf->device_lock); | |
5574 | wait_event_lock_irq(conf->wait_for_quiescent, conf->quiesce == 0, | |
5575 | conf->device_lock); | |
5576 | atomic_inc(&conf->active_aligned_reads); | |
5577 | spin_unlock_irq(&conf->device_lock); | |
5578 | } | |
387bb173 | 5579 | |
e82ed3a4 CH |
5580 | if (mddev->gendisk) |
5581 | trace_block_bio_remap(align_bio, disk_devt(mddev->gendisk), | |
5582 | raid_bio->bi_iter.bi_sector); | |
5583 | submit_bio_noacct(align_bio); | |
5584 | return 1; | |
6c0544e2 | 5585 | |
e82ed3a4 CH |
5586 | out_rcu_unlock: |
5587 | rcu_read_unlock(); | |
5588 | return 0; | |
f679623f RBJ |
5589 | } |
5590 | ||
7ef6b12a ML |
5591 | static struct bio *chunk_aligned_read(struct mddev *mddev, struct bio *raid_bio) |
5592 | { | |
5593 | struct bio *split; | |
dd7a8f5d N |
5594 | sector_t sector = raid_bio->bi_iter.bi_sector; |
5595 | unsigned chunk_sects = mddev->chunk_sectors; | |
5596 | unsigned sectors = chunk_sects - (sector & (chunk_sects-1)); | |
7ef6b12a | 5597 | |
dd7a8f5d N |
5598 | if (sectors < bio_sectors(raid_bio)) { |
5599 | struct r5conf *conf = mddev->private; | |
afeee514 | 5600 | split = bio_split(raid_bio, sectors, GFP_NOIO, &conf->bio_split); |
dd7a8f5d | 5601 | bio_chain(split, raid_bio); |
ed00aabd | 5602 | submit_bio_noacct(raid_bio); |
dd7a8f5d N |
5603 | raid_bio = split; |
5604 | } | |
7ef6b12a | 5605 | |
dd7a8f5d N |
5606 | if (!raid5_read_one_chunk(mddev, raid_bio)) |
5607 | return raid_bio; | |
7ef6b12a ML |
5608 | |
5609 | return NULL; | |
5610 | } | |
5611 | ||
8b3e6cdc DW |
5612 | /* __get_priority_stripe - get the next stripe to process |
5613 | * | |
5614 | * Full stripe writes are allowed to pass preread active stripes up until | |
5615 | * the bypass_threshold is exceeded. In general the bypass_count | |
5616 | * increments when the handle_list is handled before the hold_list; however, it | |
5617 | * will not be incremented when STRIPE_IO_STARTED is sampled set signifying a | |
5618 | * stripe with in flight i/o. The bypass_count will be reset when the | |
5619 | * head of the hold_list has changed, i.e. the head was promoted to the | |
5620 | * handle_list. | |
5621 | */ | |
851c30c9 | 5622 | static struct stripe_head *__get_priority_stripe(struct r5conf *conf, int group) |
4631f39f | 5623 | __must_hold(&conf->device_lock) |
8b3e6cdc | 5624 | { |
535ae4eb | 5625 | struct stripe_head *sh, *tmp; |
851c30c9 | 5626 | struct list_head *handle_list = NULL; |
535ae4eb | 5627 | struct r5worker_group *wg; |
70d466f7 SL |
5628 | bool second_try = !r5c_is_writeback(conf->log) && |
5629 | !r5l_log_disk_error(conf); | |
5630 | bool try_loprio = test_bit(R5C_LOG_TIGHT, &conf->cache_state) || | |
5631 | r5l_log_disk_error(conf); | |
851c30c9 | 5632 | |
535ae4eb SL |
5633 | again: |
5634 | wg = NULL; | |
5635 | sh = NULL; | |
851c30c9 | 5636 | if (conf->worker_cnt_per_group == 0) { |
535ae4eb SL |
5637 | handle_list = try_loprio ? &conf->loprio_list : |
5638 | &conf->handle_list; | |
851c30c9 | 5639 | } else if (group != ANY_GROUP) { |
535ae4eb SL |
5640 | handle_list = try_loprio ? &conf->worker_groups[group].loprio_list : |
5641 | &conf->worker_groups[group].handle_list; | |
bfc90cb0 | 5642 | wg = &conf->worker_groups[group]; |
851c30c9 SL |
5643 | } else { |
5644 | int i; | |
5645 | for (i = 0; i < conf->group_cnt; i++) { | |
535ae4eb SL |
5646 | handle_list = try_loprio ? &conf->worker_groups[i].loprio_list : |
5647 | &conf->worker_groups[i].handle_list; | |
bfc90cb0 | 5648 | wg = &conf->worker_groups[i]; |
851c30c9 SL |
5649 | if (!list_empty(handle_list)) |
5650 | break; | |
5651 | } | |
5652 | } | |
8b3e6cdc DW |
5653 | |
5654 | pr_debug("%s: handle: %s hold: %s full_writes: %d bypass_count: %d\n", | |
5655 | __func__, | |
851c30c9 | 5656 | list_empty(handle_list) ? "empty" : "busy", |
8b3e6cdc DW |
5657 | list_empty(&conf->hold_list) ? "empty" : "busy", |
5658 | atomic_read(&conf->pending_full_writes), conf->bypass_count); | |
5659 | ||
851c30c9 SL |
5660 | if (!list_empty(handle_list)) { |
5661 | sh = list_entry(handle_list->next, typeof(*sh), lru); | |
8b3e6cdc DW |
5662 | |
5663 | if (list_empty(&conf->hold_list)) | |
5664 | conf->bypass_count = 0; | |
5665 | else if (!test_bit(STRIPE_IO_STARTED, &sh->state)) { | |
5666 | if (conf->hold_list.next == conf->last_hold) | |
5667 | conf->bypass_count++; | |
5668 | else { | |
5669 | conf->last_hold = conf->hold_list.next; | |
5670 | conf->bypass_count -= conf->bypass_threshold; | |
5671 | if (conf->bypass_count < 0) | |
5672 | conf->bypass_count = 0; | |
5673 | } | |
5674 | } | |
5675 | } else if (!list_empty(&conf->hold_list) && | |
5676 | ((conf->bypass_threshold && | |
5677 | conf->bypass_count > conf->bypass_threshold) || | |
5678 | atomic_read(&conf->pending_full_writes) == 0)) { | |
851c30c9 SL |
5679 | |
5680 | list_for_each_entry(tmp, &conf->hold_list, lru) { | |
5681 | if (conf->worker_cnt_per_group == 0 || | |
5682 | group == ANY_GROUP || | |
5683 | !cpu_online(tmp->cpu) || | |
5684 | cpu_to_group(tmp->cpu) == group) { | |
5685 | sh = tmp; | |
5686 | break; | |
5687 | } | |
5688 | } | |
5689 | ||
5690 | if (sh) { | |
5691 | conf->bypass_count -= conf->bypass_threshold; | |
5692 | if (conf->bypass_count < 0) | |
5693 | conf->bypass_count = 0; | |
5694 | } | |
bfc90cb0 | 5695 | wg = NULL; |
851c30c9 SL |
5696 | } |
5697 | ||
535ae4eb SL |
5698 | if (!sh) { |
5699 | if (second_try) | |
5700 | return NULL; | |
5701 | second_try = true; | |
5702 | try_loprio = !try_loprio; | |
5703 | goto again; | |
5704 | } | |
8b3e6cdc | 5705 | |
bfc90cb0 SL |
5706 | if (wg) { |
5707 | wg->stripes_cnt--; | |
5708 | sh->group = NULL; | |
5709 | } | |
8b3e6cdc | 5710 | list_del_init(&sh->lru); |
c7a6d35e | 5711 | BUG_ON(atomic_inc_return(&sh->count) != 1); |
8b3e6cdc DW |
5712 | return sh; |
5713 | } | |
f679623f | 5714 | |
8811b596 SL |
5715 | struct raid5_plug_cb { |
5716 | struct blk_plug_cb cb; | |
5717 | struct list_head list; | |
566c09c5 | 5718 | struct list_head temp_inactive_list[NR_STRIPE_HASH_LOCKS]; |
8811b596 SL |
5719 | }; |
5720 | ||
5721 | static void raid5_unplug(struct blk_plug_cb *blk_cb, bool from_schedule) | |
5722 | { | |
5723 | struct raid5_plug_cb *cb = container_of( | |
5724 | blk_cb, struct raid5_plug_cb, cb); | |
5725 | struct stripe_head *sh; | |
5726 | struct mddev *mddev = cb->cb.data; | |
5727 | struct r5conf *conf = mddev->private; | |
a9add5d9 | 5728 | int cnt = 0; |
566c09c5 | 5729 | int hash; |
8811b596 SL |
5730 | |
5731 | if (cb->list.next && !list_empty(&cb->list)) { | |
5732 | spin_lock_irq(&conf->device_lock); | |
5733 | while (!list_empty(&cb->list)) { | |
5734 | sh = list_first_entry(&cb->list, struct stripe_head, lru); | |
5735 | list_del_init(&sh->lru); | |
5736 | /* | |
5737 | * avoid race release_stripe_plug() sees | |
5738 | * STRIPE_ON_UNPLUG_LIST clear but the stripe | |
5739 | * is still in our list | |
5740 | */ | |
4e857c58 | 5741 | smp_mb__before_atomic(); |
8811b596 | 5742 | clear_bit(STRIPE_ON_UNPLUG_LIST, &sh->state); |
773ca82f SL |
5743 | /* |
5744 | * STRIPE_ON_RELEASE_LIST could be set here. In that | |
5745 | * case, the count is always > 1 here | |
5746 | */ | |
566c09c5 SL |
5747 | hash = sh->hash_lock_index; |
5748 | __release_stripe(conf, sh, &cb->temp_inactive_list[hash]); | |
a9add5d9 | 5749 | cnt++; |
8811b596 SL |
5750 | } |
5751 | spin_unlock_irq(&conf->device_lock); | |
5752 | } | |
566c09c5 SL |
5753 | release_inactive_stripe_list(conf, cb->temp_inactive_list, |
5754 | NR_STRIPE_HASH_LOCKS); | |
e3620a3a JB |
5755 | if (mddev->queue) |
5756 | trace_block_unplug(mddev->queue, cnt, !from_schedule); | |
8811b596 SL |
5757 | kfree(cb); |
5758 | } | |
5759 | ||
5760 | static void release_stripe_plug(struct mddev *mddev, | |
5761 | struct stripe_head *sh) | |
5762 | { | |
5763 | struct blk_plug_cb *blk_cb = blk_check_plugged( | |
5764 | raid5_unplug, mddev, | |
5765 | sizeof(struct raid5_plug_cb)); | |
5766 | struct raid5_plug_cb *cb; | |
5767 | ||
5768 | if (!blk_cb) { | |
6d036f7d | 5769 | raid5_release_stripe(sh); |
8811b596 SL |
5770 | return; |
5771 | } | |
5772 | ||
5773 | cb = container_of(blk_cb, struct raid5_plug_cb, cb); | |
5774 | ||
566c09c5 SL |
5775 | if (cb->list.next == NULL) { |
5776 | int i; | |
8811b596 | 5777 | INIT_LIST_HEAD(&cb->list); |
566c09c5 SL |
5778 | for (i = 0; i < NR_STRIPE_HASH_LOCKS; i++) |
5779 | INIT_LIST_HEAD(cb->temp_inactive_list + i); | |
5780 | } | |
8811b596 SL |
5781 | |
5782 | if (!test_and_set_bit(STRIPE_ON_UNPLUG_LIST, &sh->state)) | |
5783 | list_add_tail(&sh->lru, &cb->list); | |
5784 | else | |
6d036f7d | 5785 | raid5_release_stripe(sh); |
8811b596 SL |
5786 | } |
5787 | ||
620125f2 SL |
5788 | static void make_discard_request(struct mddev *mddev, struct bio *bi) |
5789 | { | |
5790 | struct r5conf *conf = mddev->private; | |
5791 | sector_t logical_sector, last_sector; | |
5792 | struct stripe_head *sh; | |
620125f2 SL |
5793 | int stripe_sectors; |
5794 | ||
bf2c411b VV |
5795 | /* We need to handle this when io_uring supports discard/trim */ |
5796 | if (WARN_ON_ONCE(bi->bi_opf & REQ_NOWAIT)) | |
5797 | return; | |
5798 | ||
620125f2 SL |
5799 | if (mddev->reshape_position != MaxSector) |
5800 | /* Skip discard while reshape is happening */ | |
5801 | return; | |
5802 | ||
c911c46c | 5803 | logical_sector = bi->bi_iter.bi_sector & ~((sector_t)RAID5_STRIPE_SECTORS(conf)-1); |
b0f01ecf | 5804 | last_sector = bio_end_sector(bi); |
620125f2 SL |
5805 | |
5806 | bi->bi_next = NULL; | |
620125f2 SL |
5807 | |
5808 | stripe_sectors = conf->chunk_sectors * | |
5809 | (conf->raid_disks - conf->max_degraded); | |
5810 | logical_sector = DIV_ROUND_UP_SECTOR_T(logical_sector, | |
5811 | stripe_sectors); | |
5812 | sector_div(last_sector, stripe_sectors); | |
5813 | ||
5814 | logical_sector *= conf->chunk_sectors; | |
5815 | last_sector *= conf->chunk_sectors; | |
5816 | ||
5817 | for (; logical_sector < last_sector; | |
c911c46c | 5818 | logical_sector += RAID5_STRIPE_SECTORS(conf)) { |
620125f2 SL |
5819 | DEFINE_WAIT(w); |
5820 | int d; | |
5821 | again: | |
2f2d51ef | 5822 | sh = raid5_get_active_stripe(conf, NULL, logical_sector, 0); |
620125f2 SL |
5823 | prepare_to_wait(&conf->wait_for_overlap, &w, |
5824 | TASK_UNINTERRUPTIBLE); | |
f8dfcffd N |
5825 | set_bit(R5_Overlap, &sh->dev[sh->pd_idx].flags); |
5826 | if (test_bit(STRIPE_SYNCING, &sh->state)) { | |
6d036f7d | 5827 | raid5_release_stripe(sh); |
f8dfcffd N |
5828 | schedule(); |
5829 | goto again; | |
5830 | } | |
5831 | clear_bit(R5_Overlap, &sh->dev[sh->pd_idx].flags); | |
620125f2 SL |
5832 | spin_lock_irq(&sh->stripe_lock); |
5833 | for (d = 0; d < conf->raid_disks; d++) { | |
5834 | if (d == sh->pd_idx || d == sh->qd_idx) | |
5835 | continue; | |
5836 | if (sh->dev[d].towrite || sh->dev[d].toread) { | |
5837 | set_bit(R5_Overlap, &sh->dev[d].flags); | |
5838 | spin_unlock_irq(&sh->stripe_lock); | |
6d036f7d | 5839 | raid5_release_stripe(sh); |
620125f2 SL |
5840 | schedule(); |
5841 | goto again; | |
5842 | } | |
5843 | } | |
f8dfcffd | 5844 | set_bit(STRIPE_DISCARD, &sh->state); |
620125f2 | 5845 | finish_wait(&conf->wait_for_overlap, &w); |
7a87f434 | 5846 | sh->overwrite_disks = 0; |
620125f2 SL |
5847 | for (d = 0; d < conf->raid_disks; d++) { |
5848 | if (d == sh->pd_idx || d == sh->qd_idx) | |
5849 | continue; | |
5850 | sh->dev[d].towrite = bi; | |
5851 | set_bit(R5_OVERWRITE, &sh->dev[d].flags); | |
016c76ac | 5852 | bio_inc_remaining(bi); |
49728050 | 5853 | md_write_inc(mddev, bi); |
7a87f434 | 5854 | sh->overwrite_disks++; |
620125f2 SL |
5855 | } |
5856 | spin_unlock_irq(&sh->stripe_lock); | |
5857 | if (conf->mddev->bitmap) { | |
5858 | for (d = 0; | |
5859 | d < conf->raid_disks - conf->max_degraded; | |
5860 | d++) | |
e64e4018 AS |
5861 | md_bitmap_startwrite(mddev->bitmap, |
5862 | sh->sector, | |
c911c46c | 5863 | RAID5_STRIPE_SECTORS(conf), |
e64e4018 | 5864 | 0); |
620125f2 SL |
5865 | sh->bm_seq = conf->seq_flush + 1; |
5866 | set_bit(STRIPE_BIT_DELAY, &sh->state); | |
5867 | } | |
5868 | ||
5869 | set_bit(STRIPE_HANDLE, &sh->state); | |
5870 | clear_bit(STRIPE_DELAYED, &sh->state); | |
5871 | if (!test_and_set_bit(STRIPE_PREREAD_ACTIVE, &sh->state)) | |
5872 | atomic_inc(&conf->preread_active_stripes); | |
5873 | release_stripe_plug(mddev, sh); | |
5874 | } | |
5875 | ||
016c76ac | 5876 | bio_endio(bi); |
620125f2 SL |
5877 | } |
5878 | ||
a8bb304c LG |
5879 | static bool ahead_of_reshape(struct mddev *mddev, sector_t sector, |
5880 | sector_t reshape_sector) | |
5881 | { | |
5882 | return mddev->reshape_backwards ? sector < reshape_sector : | |
5883 | sector >= reshape_sector; | |
5884 | } | |
5885 | ||
486f6055 LG |
5886 | static bool range_ahead_of_reshape(struct mddev *mddev, sector_t min, |
5887 | sector_t max, sector_t reshape_sector) | |
5888 | { | |
5889 | return mddev->reshape_backwards ? max < reshape_sector : | |
5890 | min >= reshape_sector; | |
5891 | } | |
5892 | ||
5893 | static bool stripe_ahead_of_reshape(struct mddev *mddev, struct r5conf *conf, | |
5894 | struct stripe_head *sh) | |
5895 | { | |
5896 | sector_t max_sector = 0, min_sector = MaxSector; | |
5897 | bool ret = false; | |
5898 | int dd_idx; | |
5899 | ||
5900 | for (dd_idx = 0; dd_idx < sh->disks; dd_idx++) { | |
5901 | if (dd_idx == sh->pd_idx) | |
5902 | continue; | |
5903 | ||
5904 | min_sector = min(min_sector, sh->dev[dd_idx].sector); | |
5905 | max_sector = min(max_sector, sh->dev[dd_idx].sector); | |
5906 | } | |
5907 | ||
5908 | spin_lock_irq(&conf->device_lock); | |
5909 | ||
5910 | if (!range_ahead_of_reshape(mddev, min_sector, max_sector, | |
5911 | conf->reshape_progress)) | |
5912 | /* mismatch, need to try again */ | |
5913 | ret = true; | |
5914 | ||
5915 | spin_unlock_irq(&conf->device_lock); | |
5916 | ||
5917 | return ret; | |
5918 | } | |
5919 | ||
7e55c60a LG |
5920 | static int add_all_stripe_bios(struct r5conf *conf, |
5921 | struct stripe_request_ctx *ctx, struct stripe_head *sh, | |
5922 | struct bio *bi, int forwrite, int previous) | |
5923 | { | |
5924 | int dd_idx; | |
5925 | int ret = 1; | |
5926 | ||
5927 | spin_lock_irq(&sh->stripe_lock); | |
5928 | ||
5929 | for (dd_idx = 0; dd_idx < sh->disks; dd_idx++) { | |
5930 | struct r5dev *dev = &sh->dev[dd_idx]; | |
5931 | ||
5932 | if (dd_idx == sh->pd_idx || dd_idx == sh->qd_idx) | |
5933 | continue; | |
5934 | ||
5935 | if (dev->sector < ctx->first_sector || | |
5936 | dev->sector >= ctx->last_sector) | |
5937 | continue; | |
5938 | ||
5939 | if (stripe_bio_overlaps(sh, bi, dd_idx, forwrite)) { | |
5940 | set_bit(R5_Overlap, &dev->flags); | |
5941 | ret = 0; | |
5942 | continue; | |
5943 | } | |
5944 | } | |
5945 | ||
5946 | if (!ret) | |
5947 | goto out; | |
5948 | ||
5949 | for (dd_idx = 0; dd_idx < sh->disks; dd_idx++) { | |
5950 | struct r5dev *dev = &sh->dev[dd_idx]; | |
5951 | ||
5952 | if (dd_idx == sh->pd_idx || dd_idx == sh->qd_idx) | |
5953 | continue; | |
5954 | ||
5955 | if (dev->sector < ctx->first_sector || | |
5956 | dev->sector >= ctx->last_sector) | |
5957 | continue; | |
5958 | ||
5959 | __add_stripe_bio(sh, bi, dd_idx, forwrite, previous); | |
5960 | clear_bit((dev->sector - ctx->first_sector) >> | |
5961 | RAID5_STRIPE_SHIFT(conf), ctx->sectors_to_do); | |
5962 | } | |
5963 | ||
5964 | out: | |
5965 | spin_unlock_irq(&sh->stripe_lock); | |
5966 | return ret; | |
5967 | } | |
5968 | ||
f4aec6a0 LG |
5969 | static enum stripe_result make_stripe_request(struct mddev *mddev, |
5970 | struct r5conf *conf, struct stripe_request_ctx *ctx, | |
4f354560 | 5971 | sector_t logical_sector, struct bio *bi) |
f4aec6a0 LG |
5972 | { |
5973 | const int rw = bio_data_dir(bi); | |
5974 | enum stripe_result ret; | |
5975 | struct stripe_head *sh; | |
5976 | sector_t new_sector; | |
2f2d51ef | 5977 | int previous = 0, flags = 0; |
4f354560 LG |
5978 | int seq, dd_idx; |
5979 | ||
5980 | seq = read_seqcount_begin(&conf->gen_lock); | |
f4aec6a0 LG |
5981 | |
5982 | if (unlikely(conf->reshape_progress != MaxSector)) { | |
5983 | /* | |
5984 | * Spinlock is needed as reshape_progress may be | |
5985 | * 64bit on a 32bit platform, and so it might be | |
5986 | * possible to see a half-updated value | |
5987 | * Of course reshape_progress could change after | |
5988 | * the lock is dropped, so once we get a reference | |
5989 | * to the stripe that we think it is, we will have | |
5990 | * to check again. | |
5991 | */ | |
5992 | spin_lock_irq(&conf->device_lock); | |
5993 | if (ahead_of_reshape(mddev, logical_sector, | |
5994 | conf->reshape_progress)) { | |
5995 | previous = 1; | |
5996 | } else { | |
5997 | if (ahead_of_reshape(mddev, logical_sector, | |
5998 | conf->reshape_safe)) { | |
5999 | spin_unlock_irq(&conf->device_lock); | |
6000 | return STRIPE_SCHEDULE_AND_RETRY; | |
6001 | } | |
6002 | } | |
6003 | spin_unlock_irq(&conf->device_lock); | |
6004 | } | |
6005 | ||
6006 | new_sector = raid5_compute_sector(conf, logical_sector, previous, | |
6007 | &dd_idx, NULL); | |
6008 | pr_debug("raid456: %s, sector %llu logical %llu\n", __func__, | |
6009 | new_sector, logical_sector); | |
6010 | ||
2f2d51ef LG |
6011 | if (previous) |
6012 | flags |= R5_GAS_PREVIOUS; | |
6013 | if (bi->bi_opf & REQ_RAHEAD) | |
6014 | flags |= R5_GAS_NOBLOCK; | |
6015 | sh = raid5_get_active_stripe(conf, ctx, new_sector, flags); | |
f4aec6a0 LG |
6016 | if (unlikely(!sh)) { |
6017 | /* cannot get stripe, just give-up */ | |
6018 | bi->bi_status = BLK_STS_IOERR; | |
6019 | return STRIPE_FAIL; | |
6020 | } | |
6021 | ||
486f6055 LG |
6022 | if (unlikely(previous) && |
6023 | stripe_ahead_of_reshape(mddev, conf, sh)) { | |
f4aec6a0 | 6024 | /* |
486f6055 | 6025 | * Expansion moved on while waiting for a stripe. |
f4aec6a0 LG |
6026 | * Expansion could still move past after this |
6027 | * test, but as we are holding a reference to | |
6028 | * 'sh', we know that if that happens, | |
6029 | * STRIPE_EXPANDING will get set and the expansion | |
6030 | * won't proceed until we finish with the stripe. | |
6031 | */ | |
486f6055 LG |
6032 | ret = STRIPE_SCHEDULE_AND_RETRY; |
6033 | goto out_release; | |
f4aec6a0 LG |
6034 | } |
6035 | ||
6036 | if (read_seqcount_retry(&conf->gen_lock, seq)) { | |
6037 | /* Might have got the wrong stripe_head by accident */ | |
6038 | ret = STRIPE_RETRY; | |
6039 | goto out_release; | |
6040 | } | |
6041 | ||
6042 | if (test_bit(STRIPE_EXPANDING, &sh->state) || | |
7e55c60a | 6043 | !add_all_stripe_bios(conf, ctx, sh, bi, rw, previous)) { |
f4aec6a0 LG |
6044 | /* |
6045 | * Stripe is busy expanding or add failed due to | |
6046 | * overlap. Flush everything and wait a while. | |
6047 | */ | |
6048 | md_wakeup_thread(mddev->thread); | |
6049 | ret = STRIPE_SCHEDULE_AND_RETRY; | |
6050 | goto out_release; | |
6051 | } | |
6052 | ||
3312e6c8 LG |
6053 | if (stripe_can_batch(sh)) { |
6054 | stripe_add_to_batch_list(conf, sh, ctx->batch_last); | |
6055 | if (ctx->batch_last) | |
6056 | raid5_release_stripe(ctx->batch_last); | |
6057 | atomic_inc(&sh->count); | |
6058 | ctx->batch_last = sh; | |
6059 | } | |
f4aec6a0 LG |
6060 | |
6061 | if (ctx->do_flush) { | |
6062 | set_bit(STRIPE_R5C_PREFLUSH, &sh->state); | |
6063 | /* we only need flush for one stripe */ | |
6064 | ctx->do_flush = false; | |
6065 | } | |
6066 | ||
6067 | set_bit(STRIPE_HANDLE, &sh->state); | |
6068 | clear_bit(STRIPE_DELAYED, &sh->state); | |
6069 | if ((!sh->batch_head || sh == sh->batch_head) && | |
6070 | (bi->bi_opf & REQ_SYNC) && | |
6071 | !test_and_set_bit(STRIPE_PREREAD_ACTIVE, &sh->state)) | |
6072 | atomic_inc(&conf->preread_active_stripes); | |
6073 | ||
6074 | release_stripe_plug(mddev, sh); | |
6075 | return STRIPE_SUCCESS; | |
6076 | ||
6077 | out_release: | |
6078 | raid5_release_stripe(sh); | |
6079 | return ret; | |
6080 | } | |
6081 | ||
cc27b0c7 | 6082 | static bool raid5_make_request(struct mddev *mddev, struct bio * bi) |
1da177e4 | 6083 | { |
ee1aa06b | 6084 | DEFINE_WAIT_FUNC(wait, woken_wake_function); |
d1688a6d | 6085 | struct r5conf *conf = mddev->private; |
7e55c60a | 6086 | sector_t logical_sector; |
f4aec6a0 | 6087 | struct stripe_request_ctx ctx = {}; |
a362357b | 6088 | const int rw = bio_data_dir(bi); |
f4aec6a0 | 6089 | enum stripe_result res; |
b9f91d80 | 6090 | int s, stripe_cnt; |
1da177e4 | 6091 | |
1eff9d32 | 6092 | if (unlikely(bi->bi_opf & REQ_PREFLUSH)) { |
1532d9e8 | 6093 | int ret = log_handle_flush_request(conf, bi); |
828cbe98 SL |
6094 | |
6095 | if (ret == 0) | |
cc27b0c7 | 6096 | return true; |
828cbe98 | 6097 | if (ret == -ENODEV) { |
775d7831 DJ |
6098 | if (md_flush_request(mddev, bi)) |
6099 | return true; | |
828cbe98 SL |
6100 | } |
6101 | /* ret == -EAGAIN, fallback */ | |
3bddb7f8 SL |
6102 | /* |
6103 | * if r5l_handle_flush_request() didn't clear REQ_PREFLUSH, | |
6104 | * we need to flush journal device | |
6105 | */ | |
f4aec6a0 | 6106 | ctx.do_flush = bi->bi_opf & REQ_PREFLUSH; |
e5dcdd80 N |
6107 | } |
6108 | ||
cc27b0c7 N |
6109 | if (!md_write_start(mddev, bi)) |
6110 | return false; | |
9ffc8f7c EM |
6111 | /* |
6112 | * If array is degraded, better not do chunk aligned read because | |
6113 | * later we might have to read it again in order to reconstruct | |
6114 | * data on failed drives. | |
6115 | */ | |
6116 | if (rw == READ && mddev->degraded == 0 && | |
7ef6b12a ML |
6117 | mddev->reshape_position == MaxSector) { |
6118 | bi = chunk_aligned_read(mddev, bi); | |
6119 | if (!bi) | |
cc27b0c7 | 6120 | return true; |
7ef6b12a | 6121 | } |
52488615 | 6122 | |
796a5cf0 | 6123 | if (unlikely(bio_op(bi) == REQ_OP_DISCARD)) { |
620125f2 | 6124 | make_discard_request(mddev, bi); |
cc27b0c7 N |
6125 | md_write_end(mddev); |
6126 | return true; | |
620125f2 SL |
6127 | } |
6128 | ||
c911c46c | 6129 | logical_sector = bi->bi_iter.bi_sector & ~((sector_t)RAID5_STRIPE_SECTORS(conf)-1); |
7e55c60a LG |
6130 | ctx.first_sector = logical_sector; |
6131 | ctx.last_sector = bio_end_sector(bi); | |
1da177e4 | 6132 | bi->bi_next = NULL; |
06d91a5f | 6133 | |
b9f91d80 LG |
6134 | stripe_cnt = DIV_ROUND_UP_SECTOR_T(ctx.last_sector - logical_sector, |
6135 | RAID5_STRIPE_SECTORS(conf)); | |
6136 | bitmap_set(ctx.sectors_to_do, 0, stripe_cnt); | |
7e55c60a | 6137 | |
df1b620a LG |
6138 | pr_debug("raid456: %s, logical %llu to %llu\n", __func__, |
6139 | bi->bi_iter.bi_sector, ctx.last_sector); | |
6140 | ||
bf2c411b VV |
6141 | /* Bail out if conflicts with reshape and REQ_NOWAIT is set */ |
6142 | if ((bi->bi_opf & REQ_NOWAIT) && | |
6143 | (conf->reshape_progress != MaxSector) && | |
a8bb304c LG |
6144 | !ahead_of_reshape(mddev, logical_sector, conf->reshape_progress) && |
6145 | ahead_of_reshape(mddev, logical_sector, conf->reshape_safe)) { | |
bf2c411b VV |
6146 | bio_wouldblock_error(bi); |
6147 | if (rw == WRITE) | |
6148 | md_write_end(mddev); | |
6149 | return true; | |
6150 | } | |
1147f58e | 6151 | md_account_bio(mddev, &bi); |
ee1aa06b LG |
6152 | |
6153 | add_wait_queue(&conf->wait_for_overlap, &wait); | |
7e55c60a | 6154 | while (1) { |
f4aec6a0 | 6155 | res = make_stripe_request(mddev, conf, &ctx, logical_sector, |
4f354560 | 6156 | bi); |
f4aec6a0 | 6157 | if (res == STRIPE_FAIL) |
27fb7010 | 6158 | break; |
3bddb7f8 | 6159 | |
f4aec6a0 | 6160 | if (res == STRIPE_RETRY) |
0a2d1694 | 6161 | continue; |
27fb7010 | 6162 | |
f4aec6a0 | 6163 | if (res == STRIPE_SCHEDULE_AND_RETRY) { |
3312e6c8 LG |
6164 | /* |
6165 | * Must release the reference to batch_last before | |
6166 | * scheduling and waiting for work to be done, | |
6167 | * otherwise the batch_last stripe head could prevent | |
6168 | * raid5_activate_delayed() from making progress | |
6169 | * and thus deadlocking. | |
6170 | */ | |
6171 | if (ctx.batch_last) { | |
6172 | raid5_release_stripe(ctx.batch_last); | |
6173 | ctx.batch_last = NULL; | |
6174 | } | |
6175 | ||
ee1aa06b LG |
6176 | wait_woken(&wait, TASK_UNINTERRUPTIBLE, |
6177 | MAX_SCHEDULE_TIMEOUT); | |
0a2d1694 | 6178 | continue; |
1da177e4 | 6179 | } |
0a2d1694 | 6180 | |
b9f91d80 LG |
6181 | s = find_first_bit(ctx.sectors_to_do, stripe_cnt); |
6182 | if (s == stripe_cnt) | |
7e55c60a LG |
6183 | break; |
6184 | ||
6185 | logical_sector = ctx.first_sector + | |
6186 | (s << RAID5_STRIPE_SHIFT(conf)); | |
1da177e4 | 6187 | } |
ee1aa06b | 6188 | remove_wait_queue(&conf->wait_for_overlap, &wait); |
7c13edc8 | 6189 | |
3312e6c8 LG |
6190 | if (ctx.batch_last) |
6191 | raid5_release_stripe(ctx.batch_last); | |
6192 | ||
49728050 N |
6193 | if (rw == WRITE) |
6194 | md_write_end(mddev); | |
016c76ac | 6195 | bio_endio(bi); |
cc27b0c7 | 6196 | return true; |
1da177e4 LT |
6197 | } |
6198 | ||
fd01b88c | 6199 | static sector_t raid5_size(struct mddev *mddev, sector_t sectors, int raid_disks); |
b522adcd | 6200 | |
fd01b88c | 6201 | static sector_t reshape_request(struct mddev *mddev, sector_t sector_nr, int *skipped) |
1da177e4 | 6202 | { |
52c03291 N |
6203 | /* reshaping is quite different to recovery/resync so it is |
6204 | * handled quite separately ... here. | |
6205 | * | |
6206 | * On each call to sync_request, we gather one chunk worth of | |
6207 | * destination stripes and flag them as expanding. | |
6208 | * Then we find all the source stripes and request reads. | |
6209 | * As the reads complete, handle_stripe will copy the data | |
6210 | * into the destination stripe and release that stripe. | |
6211 | */ | |
d1688a6d | 6212 | struct r5conf *conf = mddev->private; |
1da177e4 | 6213 | struct stripe_head *sh; |
db0505d3 | 6214 | struct md_rdev *rdev; |
ccfcc3c1 | 6215 | sector_t first_sector, last_sector; |
f416885e N |
6216 | int raid_disks = conf->previous_raid_disks; |
6217 | int data_disks = raid_disks - conf->max_degraded; | |
6218 | int new_data_disks = conf->raid_disks - conf->max_degraded; | |
52c03291 N |
6219 | int i; |
6220 | int dd_idx; | |
c8f517c4 | 6221 | sector_t writepos, readpos, safepos; |
ec32a2bd | 6222 | sector_t stripe_addr; |
7a661381 | 6223 | int reshape_sectors; |
ab69ae12 | 6224 | struct list_head stripes; |
92140480 | 6225 | sector_t retn; |
52c03291 | 6226 | |
fef9c61f N |
6227 | if (sector_nr == 0) { |
6228 | /* If restarting in the middle, skip the initial sectors */ | |
2c810cdd | 6229 | if (mddev->reshape_backwards && |
fef9c61f N |
6230 | conf->reshape_progress < raid5_size(mddev, 0, 0)) { |
6231 | sector_nr = raid5_size(mddev, 0, 0) | |
6232 | - conf->reshape_progress; | |
6cbd8148 N |
6233 | } else if (mddev->reshape_backwards && |
6234 | conf->reshape_progress == MaxSector) { | |
6235 | /* shouldn't happen, but just in case, finish up.*/ | |
6236 | sector_nr = MaxSector; | |
2c810cdd | 6237 | } else if (!mddev->reshape_backwards && |
fef9c61f N |
6238 | conf->reshape_progress > 0) |
6239 | sector_nr = conf->reshape_progress; | |
f416885e | 6240 | sector_div(sector_nr, new_data_disks); |
fef9c61f | 6241 | if (sector_nr) { |
8dee7211 | 6242 | mddev->curr_resync_completed = sector_nr; |
e1a86dbb | 6243 | sysfs_notify_dirent_safe(mddev->sysfs_completed); |
fef9c61f | 6244 | *skipped = 1; |
92140480 N |
6245 | retn = sector_nr; |
6246 | goto finish; | |
fef9c61f | 6247 | } |
52c03291 N |
6248 | } |
6249 | ||
7a661381 N |
6250 | /* We need to process a full chunk at a time. |
6251 | * If old and new chunk sizes differ, we need to process the | |
6252 | * largest of these | |
6253 | */ | |
3cb5edf4 N |
6254 | |
6255 | reshape_sectors = max(conf->chunk_sectors, conf->prev_chunk_sectors); | |
7a661381 | 6256 | |
b5254dd5 N |
6257 | /* We update the metadata at least every 10 seconds, or when |
6258 | * the data about to be copied would over-write the source of | |
6259 | * the data at the front of the range. i.e. one new_stripe | |
6260 | * along from reshape_progress new_maps to after where | |
6261 | * reshape_safe old_maps to | |
52c03291 | 6262 | */ |
fef9c61f | 6263 | writepos = conf->reshape_progress; |
f416885e | 6264 | sector_div(writepos, new_data_disks); |
c8f517c4 N |
6265 | readpos = conf->reshape_progress; |
6266 | sector_div(readpos, data_disks); | |
fef9c61f | 6267 | safepos = conf->reshape_safe; |
f416885e | 6268 | sector_div(safepos, data_disks); |
2c810cdd | 6269 | if (mddev->reshape_backwards) { |
c74c0d76 N |
6270 | BUG_ON(writepos < reshape_sectors); |
6271 | writepos -= reshape_sectors; | |
c8f517c4 | 6272 | readpos += reshape_sectors; |
7a661381 | 6273 | safepos += reshape_sectors; |
fef9c61f | 6274 | } else { |
7a661381 | 6275 | writepos += reshape_sectors; |
c74c0d76 N |
6276 | /* readpos and safepos are worst-case calculations. |
6277 | * A negative number is overly pessimistic, and causes | |
6278 | * obvious problems for unsigned storage. So clip to 0. | |
6279 | */ | |
ed37d83e N |
6280 | readpos -= min_t(sector_t, reshape_sectors, readpos); |
6281 | safepos -= min_t(sector_t, reshape_sectors, safepos); | |
fef9c61f | 6282 | } |
52c03291 | 6283 | |
b5254dd5 N |
6284 | /* Having calculated the 'writepos' possibly use it |
6285 | * to set 'stripe_addr' which is where we will write to. | |
6286 | */ | |
6287 | if (mddev->reshape_backwards) { | |
6288 | BUG_ON(conf->reshape_progress == 0); | |
6289 | stripe_addr = writepos; | |
6290 | BUG_ON((mddev->dev_sectors & | |
6291 | ~((sector_t)reshape_sectors - 1)) | |
6292 | - reshape_sectors - stripe_addr | |
6293 | != sector_nr); | |
6294 | } else { | |
6295 | BUG_ON(writepos != sector_nr + reshape_sectors); | |
6296 | stripe_addr = sector_nr; | |
6297 | } | |
6298 | ||
c8f517c4 N |
6299 | /* 'writepos' is the most advanced device address we might write. |
6300 | * 'readpos' is the least advanced device address we might read. | |
6301 | * 'safepos' is the least address recorded in the metadata as having | |
6302 | * been reshaped. | |
b5254dd5 N |
6303 | * If there is a min_offset_diff, these are adjusted either by |
6304 | * increasing the safepos/readpos if diff is negative, or | |
6305 | * increasing writepos if diff is positive. | |
6306 | * If 'readpos' is then behind 'writepos', there is no way that we can | |
c8f517c4 N |
6307 | * ensure safety in the face of a crash - that must be done by userspace |
6308 | * making a backup of the data. So in that case there is no particular | |
6309 | * rush to update metadata. | |
6310 | * Otherwise if 'safepos' is behind 'writepos', then we really need to | |
6311 | * update the metadata to advance 'safepos' to match 'readpos' so that | |
6312 | * we can be safe in the event of a crash. | |
6313 | * So we insist on updating metadata if safepos is behind writepos and | |
6314 | * readpos is beyond writepos. | |
6315 | * In any case, update the metadata every 10 seconds. | |
6316 | * Maybe that number should be configurable, but I'm not sure it is | |
6317 | * worth it.... maybe it could be a multiple of safemode_delay??? | |
6318 | */ | |
b5254dd5 N |
6319 | if (conf->min_offset_diff < 0) { |
6320 | safepos += -conf->min_offset_diff; | |
6321 | readpos += -conf->min_offset_diff; | |
6322 | } else | |
6323 | writepos += conf->min_offset_diff; | |
6324 | ||
2c810cdd | 6325 | if ((mddev->reshape_backwards |
c8f517c4 N |
6326 | ? (safepos > writepos && readpos < writepos) |
6327 | : (safepos < writepos && readpos > writepos)) || | |
6328 | time_after(jiffies, conf->reshape_checkpoint + 10*HZ)) { | |
52c03291 N |
6329 | /* Cannot proceed until we've updated the superblock... */ |
6330 | wait_event(conf->wait_for_overlap, | |
c91abf5a N |
6331 | atomic_read(&conf->reshape_stripes)==0 |
6332 | || test_bit(MD_RECOVERY_INTR, &mddev->recovery)); | |
6333 | if (atomic_read(&conf->reshape_stripes) != 0) | |
6334 | return 0; | |
fef9c61f | 6335 | mddev->reshape_position = conf->reshape_progress; |
75d3da43 | 6336 | mddev->curr_resync_completed = sector_nr; |
db0505d3 N |
6337 | if (!mddev->reshape_backwards) |
6338 | /* Can update recovery_offset */ | |
6339 | rdev_for_each(rdev, mddev) | |
6340 | if (rdev->raid_disk >= 0 && | |
6341 | !test_bit(Journal, &rdev->flags) && | |
6342 | !test_bit(In_sync, &rdev->flags) && | |
6343 | rdev->recovery_offset < sector_nr) | |
6344 | rdev->recovery_offset = sector_nr; | |
6345 | ||
c8f517c4 | 6346 | conf->reshape_checkpoint = jiffies; |
2953079c | 6347 | set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags); |
52c03291 | 6348 | md_wakeup_thread(mddev->thread); |
2953079c | 6349 | wait_event(mddev->sb_wait, mddev->sb_flags == 0 || |
c91abf5a N |
6350 | test_bit(MD_RECOVERY_INTR, &mddev->recovery)); |
6351 | if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) | |
6352 | return 0; | |
52c03291 | 6353 | spin_lock_irq(&conf->device_lock); |
fef9c61f | 6354 | conf->reshape_safe = mddev->reshape_position; |
52c03291 N |
6355 | spin_unlock_irq(&conf->device_lock); |
6356 | wake_up(&conf->wait_for_overlap); | |
e1a86dbb | 6357 | sysfs_notify_dirent_safe(mddev->sysfs_completed); |
52c03291 N |
6358 | } |
6359 | ||
ab69ae12 | 6360 | INIT_LIST_HEAD(&stripes); |
c911c46c | 6361 | for (i = 0; i < reshape_sectors; i += RAID5_STRIPE_SECTORS(conf)) { |
52c03291 | 6362 | int j; |
a9f326eb | 6363 | int skipped_disk = 0; |
2f2d51ef LG |
6364 | sh = raid5_get_active_stripe(conf, NULL, stripe_addr+i, |
6365 | R5_GAS_NOQUIESCE); | |
52c03291 N |
6366 | set_bit(STRIPE_EXPANDING, &sh->state); |
6367 | atomic_inc(&conf->reshape_stripes); | |
6368 | /* If any of this stripe is beyond the end of the old | |
6369 | * array, then we need to zero those blocks | |
6370 | */ | |
6371 | for (j=sh->disks; j--;) { | |
6372 | sector_t s; | |
6373 | if (j == sh->pd_idx) | |
6374 | continue; | |
f416885e | 6375 | if (conf->level == 6 && |
d0dabf7e | 6376 | j == sh->qd_idx) |
f416885e | 6377 | continue; |
6d036f7d | 6378 | s = raid5_compute_blocknr(sh, j, 0); |
b522adcd | 6379 | if (s < raid5_size(mddev, 0, 0)) { |
a9f326eb | 6380 | skipped_disk = 1; |
52c03291 N |
6381 | continue; |
6382 | } | |
c911c46c | 6383 | memset(page_address(sh->dev[j].page), 0, RAID5_STRIPE_SIZE(conf)); |
52c03291 N |
6384 | set_bit(R5_Expanded, &sh->dev[j].flags); |
6385 | set_bit(R5_UPTODATE, &sh->dev[j].flags); | |
6386 | } | |
a9f326eb | 6387 | if (!skipped_disk) { |
52c03291 N |
6388 | set_bit(STRIPE_EXPAND_READY, &sh->state); |
6389 | set_bit(STRIPE_HANDLE, &sh->state); | |
6390 | } | |
ab69ae12 | 6391 | list_add(&sh->lru, &stripes); |
52c03291 N |
6392 | } |
6393 | spin_lock_irq(&conf->device_lock); | |
2c810cdd | 6394 | if (mddev->reshape_backwards) |
7a661381 | 6395 | conf->reshape_progress -= reshape_sectors * new_data_disks; |
fef9c61f | 6396 | else |
7a661381 | 6397 | conf->reshape_progress += reshape_sectors * new_data_disks; |
52c03291 N |
6398 | spin_unlock_irq(&conf->device_lock); |
6399 | /* Ok, those stripe are ready. We can start scheduling | |
6400 | * reads on the source stripes. | |
6401 | * The source stripes are determined by mapping the first and last | |
6402 | * block on the destination stripes. | |
6403 | */ | |
52c03291 | 6404 | first_sector = |
ec32a2bd | 6405 | raid5_compute_sector(conf, stripe_addr*(new_data_disks), |
911d4ee8 | 6406 | 1, &dd_idx, NULL); |
52c03291 | 6407 | last_sector = |
0e6e0271 | 6408 | raid5_compute_sector(conf, ((stripe_addr+reshape_sectors) |
09c9e5fa | 6409 | * new_data_disks - 1), |
911d4ee8 | 6410 | 1, &dd_idx, NULL); |
58c0fed4 AN |
6411 | if (last_sector >= mddev->dev_sectors) |
6412 | last_sector = mddev->dev_sectors - 1; | |
52c03291 | 6413 | while (first_sector <= last_sector) { |
2f2d51ef LG |
6414 | sh = raid5_get_active_stripe(conf, NULL, first_sector, |
6415 | R5_GAS_PREVIOUS | R5_GAS_NOQUIESCE); | |
52c03291 N |
6416 | set_bit(STRIPE_EXPAND_SOURCE, &sh->state); |
6417 | set_bit(STRIPE_HANDLE, &sh->state); | |
6d036f7d | 6418 | raid5_release_stripe(sh); |
c911c46c | 6419 | first_sector += RAID5_STRIPE_SECTORS(conf); |
52c03291 | 6420 | } |
ab69ae12 N |
6421 | /* Now that the sources are clearly marked, we can release |
6422 | * the destination stripes | |
6423 | */ | |
6424 | while (!list_empty(&stripes)) { | |
6425 | sh = list_entry(stripes.next, struct stripe_head, lru); | |
6426 | list_del_init(&sh->lru); | |
6d036f7d | 6427 | raid5_release_stripe(sh); |
ab69ae12 | 6428 | } |
c6207277 N |
6429 | /* If this takes us to the resync_max point where we have to pause, |
6430 | * then we need to write out the superblock. | |
6431 | */ | |
7a661381 | 6432 | sector_nr += reshape_sectors; |
92140480 N |
6433 | retn = reshape_sectors; |
6434 | finish: | |
c5e19d90 N |
6435 | if (mddev->curr_resync_completed > mddev->resync_max || |
6436 | (sector_nr - mddev->curr_resync_completed) * 2 | |
c03f6a19 | 6437 | >= mddev->resync_max - mddev->curr_resync_completed) { |
c6207277 N |
6438 | /* Cannot proceed until we've updated the superblock... */ |
6439 | wait_event(conf->wait_for_overlap, | |
c91abf5a N |
6440 | atomic_read(&conf->reshape_stripes) == 0 |
6441 | || test_bit(MD_RECOVERY_INTR, &mddev->recovery)); | |
6442 | if (atomic_read(&conf->reshape_stripes) != 0) | |
6443 | goto ret; | |
fef9c61f | 6444 | mddev->reshape_position = conf->reshape_progress; |
75d3da43 | 6445 | mddev->curr_resync_completed = sector_nr; |
db0505d3 N |
6446 | if (!mddev->reshape_backwards) |
6447 | /* Can update recovery_offset */ | |
6448 | rdev_for_each(rdev, mddev) | |
6449 | if (rdev->raid_disk >= 0 && | |
6450 | !test_bit(Journal, &rdev->flags) && | |
6451 | !test_bit(In_sync, &rdev->flags) && | |
6452 | rdev->recovery_offset < sector_nr) | |
6453 | rdev->recovery_offset = sector_nr; | |
c8f517c4 | 6454 | conf->reshape_checkpoint = jiffies; |
2953079c | 6455 | set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags); |
c6207277 N |
6456 | md_wakeup_thread(mddev->thread); |
6457 | wait_event(mddev->sb_wait, | |
2953079c | 6458 | !test_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags) |
c91abf5a N |
6459 | || test_bit(MD_RECOVERY_INTR, &mddev->recovery)); |
6460 | if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) | |
6461 | goto ret; | |
c6207277 | 6462 | spin_lock_irq(&conf->device_lock); |
fef9c61f | 6463 | conf->reshape_safe = mddev->reshape_position; |
c6207277 N |
6464 | spin_unlock_irq(&conf->device_lock); |
6465 | wake_up(&conf->wait_for_overlap); | |
e1a86dbb | 6466 | sysfs_notify_dirent_safe(mddev->sysfs_completed); |
c6207277 | 6467 | } |
c91abf5a | 6468 | ret: |
92140480 | 6469 | return retn; |
52c03291 N |
6470 | } |
6471 | ||
849674e4 SL |
6472 | static inline sector_t raid5_sync_request(struct mddev *mddev, sector_t sector_nr, |
6473 | int *skipped) | |
52c03291 | 6474 | { |
d1688a6d | 6475 | struct r5conf *conf = mddev->private; |
52c03291 | 6476 | struct stripe_head *sh; |
58c0fed4 | 6477 | sector_t max_sector = mddev->dev_sectors; |
57dab0bd | 6478 | sector_t sync_blocks; |
16a53ecc N |
6479 | int still_degraded = 0; |
6480 | int i; | |
1da177e4 | 6481 | |
72626685 | 6482 | if (sector_nr >= max_sector) { |
1da177e4 | 6483 | /* just being told to finish up .. nothing much to do */ |
cea9c228 | 6484 | |
29269553 N |
6485 | if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)) { |
6486 | end_reshape(conf); | |
6487 | return 0; | |
6488 | } | |
72626685 N |
6489 | |
6490 | if (mddev->curr_resync < max_sector) /* aborted */ | |
e64e4018 AS |
6491 | md_bitmap_end_sync(mddev->bitmap, mddev->curr_resync, |
6492 | &sync_blocks, 1); | |
16a53ecc | 6493 | else /* completed sync */ |
72626685 | 6494 | conf->fullsync = 0; |
e64e4018 | 6495 | md_bitmap_close_sync(mddev->bitmap); |
72626685 | 6496 | |
1da177e4 LT |
6497 | return 0; |
6498 | } | |
ccfcc3c1 | 6499 | |
64bd660b N |
6500 | /* Allow raid5_quiesce to complete */ |
6501 | wait_event(conf->wait_for_overlap, conf->quiesce != 2); | |
6502 | ||
52c03291 N |
6503 | if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)) |
6504 | return reshape_request(mddev, sector_nr, skipped); | |
f6705578 | 6505 | |
c6207277 N |
6506 | /* No need to check resync_max as we never do more than one |
6507 | * stripe, and as resync_max will always be on a chunk boundary, | |
6508 | * if the check in md_do_sync didn't fire, there is no chance | |
6509 | * of overstepping resync_max here | |
6510 | */ | |
6511 | ||
16a53ecc | 6512 | /* if there is too many failed drives and we are trying |
1da177e4 LT |
6513 | * to resync, then assert that we are finished, because there is |
6514 | * nothing we can do. | |
6515 | */ | |
3285edf1 | 6516 | if (mddev->degraded >= conf->max_degraded && |
16a53ecc | 6517 | test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) { |
58c0fed4 | 6518 | sector_t rv = mddev->dev_sectors - sector_nr; |
57afd89f | 6519 | *skipped = 1; |
1da177e4 LT |
6520 | return rv; |
6521 | } | |
6f608040 | 6522 | if (!test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery) && |
6523 | !conf->fullsync && | |
e64e4018 | 6524 | !md_bitmap_start_sync(mddev->bitmap, sector_nr, &sync_blocks, 1) && |
c911c46c | 6525 | sync_blocks >= RAID5_STRIPE_SECTORS(conf)) { |
72626685 | 6526 | /* we can skip this block, and probably more */ |
83c3e5e1 | 6527 | do_div(sync_blocks, RAID5_STRIPE_SECTORS(conf)); |
72626685 | 6528 | *skipped = 1; |
c911c46c YY |
6529 | /* keep things rounded to whole stripes */ |
6530 | return sync_blocks * RAID5_STRIPE_SECTORS(conf); | |
72626685 | 6531 | } |
1da177e4 | 6532 | |
e64e4018 | 6533 | md_bitmap_cond_end_sync(mddev->bitmap, sector_nr, false); |
b47490c9 | 6534 | |
2f2d51ef LG |
6535 | sh = raid5_get_active_stripe(conf, NULL, sector_nr, |
6536 | R5_GAS_NOBLOCK); | |
1da177e4 | 6537 | if (sh == NULL) { |
2f2d51ef | 6538 | sh = raid5_get_active_stripe(conf, NULL, sector_nr, 0); |
1da177e4 | 6539 | /* make sure we don't swamp the stripe cache if someone else |
16a53ecc | 6540 | * is trying to get access |
1da177e4 | 6541 | */ |
66c006a5 | 6542 | schedule_timeout_uninterruptible(1); |
1da177e4 | 6543 | } |
16a53ecc | 6544 | /* Need to check if array will still be degraded after recovery/resync |
16d9cfab EM |
6545 | * Note in case of > 1 drive failures it's possible we're rebuilding |
6546 | * one drive while leaving another faulty drive in array. | |
16a53ecc | 6547 | */ |
16d9cfab EM |
6548 | rcu_read_lock(); |
6549 | for (i = 0; i < conf->raid_disks; i++) { | |
b0920ede | 6550 | struct md_rdev *rdev = rcu_dereference(conf->disks[i].rdev); |
16d9cfab EM |
6551 | |
6552 | if (rdev == NULL || test_bit(Faulty, &rdev->flags)) | |
16a53ecc | 6553 | still_degraded = 1; |
16d9cfab EM |
6554 | } |
6555 | rcu_read_unlock(); | |
16a53ecc | 6556 | |
e64e4018 | 6557 | md_bitmap_start_sync(mddev->bitmap, sector_nr, &sync_blocks, still_degraded); |
16a53ecc | 6558 | |
83206d66 | 6559 | set_bit(STRIPE_SYNC_REQUESTED, &sh->state); |
053f5b65 | 6560 | set_bit(STRIPE_HANDLE, &sh->state); |
1da177e4 | 6561 | |
6d036f7d | 6562 | raid5_release_stripe(sh); |
1da177e4 | 6563 | |
c911c46c | 6564 | return RAID5_STRIPE_SECTORS(conf); |
1da177e4 LT |
6565 | } |
6566 | ||
0472a42b N |
6567 | static int retry_aligned_read(struct r5conf *conf, struct bio *raid_bio, |
6568 | unsigned int offset) | |
46031f9a RBJ |
6569 | { |
6570 | /* We may not be able to submit a whole bio at once as there | |
6571 | * may not be enough stripe_heads available. | |
6572 | * We cannot pre-allocate enough stripe_heads as we may need | |
6573 | * more than exist in the cache (if we allow ever large chunks). | |
6574 | * So we do one stripe head at a time and record in | |
6575 | * ->bi_hw_segments how many have been done. | |
6576 | * | |
6577 | * We *know* that this entire raid_bio is in one chunk, so | |
6578 | * it will be only one 'dd_idx' and only need one call to raid5_compute_sector. | |
6579 | */ | |
6580 | struct stripe_head *sh; | |
911d4ee8 | 6581 | int dd_idx; |
46031f9a RBJ |
6582 | sector_t sector, logical_sector, last_sector; |
6583 | int scnt = 0; | |
46031f9a RBJ |
6584 | int handled = 0; |
6585 | ||
4f024f37 | 6586 | logical_sector = raid_bio->bi_iter.bi_sector & |
c911c46c | 6587 | ~((sector_t)RAID5_STRIPE_SECTORS(conf)-1); |
112bf897 | 6588 | sector = raid5_compute_sector(conf, logical_sector, |
911d4ee8 | 6589 | 0, &dd_idx, NULL); |
f73a1c7d | 6590 | last_sector = bio_end_sector(raid_bio); |
46031f9a RBJ |
6591 | |
6592 | for (; logical_sector < last_sector; | |
c911c46c YY |
6593 | logical_sector += RAID5_STRIPE_SECTORS(conf), |
6594 | sector += RAID5_STRIPE_SECTORS(conf), | |
387bb173 | 6595 | scnt++) { |
46031f9a | 6596 | |
0472a42b | 6597 | if (scnt < offset) |
46031f9a RBJ |
6598 | /* already done this stripe */ |
6599 | continue; | |
6600 | ||
2f2d51ef LG |
6601 | sh = raid5_get_active_stripe(conf, NULL, sector, |
6602 | R5_GAS_NOBLOCK | R5_GAS_NOQUIESCE); | |
46031f9a RBJ |
6603 | if (!sh) { |
6604 | /* failed to get a stripe - must wait */ | |
46031f9a | 6605 | conf->retry_read_aligned = raid_bio; |
0472a42b | 6606 | conf->retry_read_offset = scnt; |
46031f9a RBJ |
6607 | return handled; |
6608 | } | |
6609 | ||
da41ba65 | 6610 | if (!add_stripe_bio(sh, raid_bio, dd_idx, 0, 0)) { |
6d036f7d | 6611 | raid5_release_stripe(sh); |
387bb173 | 6612 | conf->retry_read_aligned = raid_bio; |
0472a42b | 6613 | conf->retry_read_offset = scnt; |
387bb173 NB |
6614 | return handled; |
6615 | } | |
6616 | ||
3f9e7c14 | 6617 | set_bit(R5_ReadNoMerge, &sh->dev[dd_idx].flags); |
36d1c647 | 6618 | handle_stripe(sh); |
6d036f7d | 6619 | raid5_release_stripe(sh); |
46031f9a RBJ |
6620 | handled++; |
6621 | } | |
016c76ac N |
6622 | |
6623 | bio_endio(raid_bio); | |
6624 | ||
46031f9a | 6625 | if (atomic_dec_and_test(&conf->active_aligned_reads)) |
b1b46486 | 6626 | wake_up(&conf->wait_for_quiescent); |
46031f9a RBJ |
6627 | return handled; |
6628 | } | |
6629 | ||
bfc90cb0 | 6630 | static int handle_active_stripes(struct r5conf *conf, int group, |
566c09c5 SL |
6631 | struct r5worker *worker, |
6632 | struct list_head *temp_inactive_list) | |
4631f39f | 6633 | __must_hold(&conf->device_lock) |
46a06401 SL |
6634 | { |
6635 | struct stripe_head *batch[MAX_STRIPE_BATCH], *sh; | |
566c09c5 SL |
6636 | int i, batch_size = 0, hash; |
6637 | bool release_inactive = false; | |
46a06401 SL |
6638 | |
6639 | while (batch_size < MAX_STRIPE_BATCH && | |
851c30c9 | 6640 | (sh = __get_priority_stripe(conf, group)) != NULL) |
46a06401 SL |
6641 | batch[batch_size++] = sh; |
6642 | ||
566c09c5 SL |
6643 | if (batch_size == 0) { |
6644 | for (i = 0; i < NR_STRIPE_HASH_LOCKS; i++) | |
6645 | if (!list_empty(temp_inactive_list + i)) | |
6646 | break; | |
a8c34f91 SL |
6647 | if (i == NR_STRIPE_HASH_LOCKS) { |
6648 | spin_unlock_irq(&conf->device_lock); | |
1532d9e8 | 6649 | log_flush_stripe_to_raid(conf); |
a8c34f91 | 6650 | spin_lock_irq(&conf->device_lock); |
566c09c5 | 6651 | return batch_size; |
a8c34f91 | 6652 | } |
566c09c5 SL |
6653 | release_inactive = true; |
6654 | } | |
46a06401 SL |
6655 | spin_unlock_irq(&conf->device_lock); |
6656 | ||
566c09c5 SL |
6657 | release_inactive_stripe_list(conf, temp_inactive_list, |
6658 | NR_STRIPE_HASH_LOCKS); | |
6659 | ||
a8c34f91 | 6660 | r5l_flush_stripe_to_raid(conf->log); |
566c09c5 SL |
6661 | if (release_inactive) { |
6662 | spin_lock_irq(&conf->device_lock); | |
6663 | return 0; | |
6664 | } | |
6665 | ||
46a06401 SL |
6666 | for (i = 0; i < batch_size; i++) |
6667 | handle_stripe(batch[i]); | |
ff875738 | 6668 | log_write_stripe_run(conf); |
46a06401 SL |
6669 | |
6670 | cond_resched(); | |
6671 | ||
6672 | spin_lock_irq(&conf->device_lock); | |
566c09c5 SL |
6673 | for (i = 0; i < batch_size; i++) { |
6674 | hash = batch[i]->hash_lock_index; | |
6675 | __release_stripe(conf, batch[i], &temp_inactive_list[hash]); | |
6676 | } | |
46a06401 SL |
6677 | return batch_size; |
6678 | } | |
46031f9a | 6679 | |
851c30c9 SL |
6680 | static void raid5_do_work(struct work_struct *work) |
6681 | { | |
6682 | struct r5worker *worker = container_of(work, struct r5worker, work); | |
6683 | struct r5worker_group *group = worker->group; | |
6684 | struct r5conf *conf = group->conf; | |
16d997b7 | 6685 | struct mddev *mddev = conf->mddev; |
851c30c9 SL |
6686 | int group_id = group - conf->worker_groups; |
6687 | int handled; | |
6688 | struct blk_plug plug; | |
6689 | ||
6690 | pr_debug("+++ raid5worker active\n"); | |
6691 | ||
6692 | blk_start_plug(&plug); | |
6693 | handled = 0; | |
6694 | spin_lock_irq(&conf->device_lock); | |
6695 | while (1) { | |
6696 | int batch_size, released; | |
6697 | ||
566c09c5 | 6698 | released = release_stripe_list(conf, worker->temp_inactive_list); |
851c30c9 | 6699 | |
566c09c5 SL |
6700 | batch_size = handle_active_stripes(conf, group_id, worker, |
6701 | worker->temp_inactive_list); | |
bfc90cb0 | 6702 | worker->working = false; |
851c30c9 SL |
6703 | if (!batch_size && !released) |
6704 | break; | |
6705 | handled += batch_size; | |
16d997b7 N |
6706 | wait_event_lock_irq(mddev->sb_wait, |
6707 | !test_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags), | |
6708 | conf->device_lock); | |
851c30c9 SL |
6709 | } |
6710 | pr_debug("%d stripes handled\n", handled); | |
6711 | ||
6712 | spin_unlock_irq(&conf->device_lock); | |
7e96d559 | 6713 | |
9c72a18e SL |
6714 | flush_deferred_bios(conf); |
6715 | ||
6716 | r5l_flush_stripe_to_raid(conf->log); | |
6717 | ||
7e96d559 | 6718 | async_tx_issue_pending_all(); |
851c30c9 SL |
6719 | blk_finish_plug(&plug); |
6720 | ||
6721 | pr_debug("--- raid5worker inactive\n"); | |
6722 | } | |
6723 | ||
1da177e4 LT |
6724 | /* |
6725 | * This is our raid5 kernel thread. | |
6726 | * | |
6727 | * We scan the hash table for stripes which can be handled now. | |
6728 | * During the scan, completed stripes are saved for us by the interrupt | |
6729 | * handler, so that they will not have to wait for our next wakeup. | |
6730 | */ | |
4ed8731d | 6731 | static void raid5d(struct md_thread *thread) |
1da177e4 | 6732 | { |
4ed8731d | 6733 | struct mddev *mddev = thread->mddev; |
d1688a6d | 6734 | struct r5conf *conf = mddev->private; |
1da177e4 | 6735 | int handled; |
e1dfa0a2 | 6736 | struct blk_plug plug; |
1da177e4 | 6737 | |
45b4233c | 6738 | pr_debug("+++ raid5d active\n"); |
1da177e4 LT |
6739 | |
6740 | md_check_recovery(mddev); | |
1da177e4 | 6741 | |
e1dfa0a2 | 6742 | blk_start_plug(&plug); |
1da177e4 LT |
6743 | handled = 0; |
6744 | spin_lock_irq(&conf->device_lock); | |
6745 | while (1) { | |
46031f9a | 6746 | struct bio *bio; |
773ca82f | 6747 | int batch_size, released; |
0472a42b | 6748 | unsigned int offset; |
773ca82f | 6749 | |
566c09c5 | 6750 | released = release_stripe_list(conf, conf->temp_inactive_list); |
edbe83ab N |
6751 | if (released) |
6752 | clear_bit(R5_DID_ALLOC, &conf->cache_state); | |
1da177e4 | 6753 | |
0021b7bc | 6754 | if ( |
7c13edc8 N |
6755 | !list_empty(&conf->bitmap_list)) { |
6756 | /* Now is a good time to flush some bitmap updates */ | |
6757 | conf->seq_flush++; | |
700e432d | 6758 | spin_unlock_irq(&conf->device_lock); |
e64e4018 | 6759 | md_bitmap_unplug(mddev->bitmap); |
700e432d | 6760 | spin_lock_irq(&conf->device_lock); |
7c13edc8 | 6761 | conf->seq_write = conf->seq_flush; |
566c09c5 | 6762 | activate_bit_delay(conf, conf->temp_inactive_list); |
72626685 | 6763 | } |
0021b7bc | 6764 | raid5_activate_delayed(conf); |
72626685 | 6765 | |
0472a42b | 6766 | while ((bio = remove_bio_from_retry(conf, &offset))) { |
46031f9a RBJ |
6767 | int ok; |
6768 | spin_unlock_irq(&conf->device_lock); | |
0472a42b | 6769 | ok = retry_aligned_read(conf, bio, offset); |
46031f9a RBJ |
6770 | spin_lock_irq(&conf->device_lock); |
6771 | if (!ok) | |
6772 | break; | |
6773 | handled++; | |
6774 | } | |
6775 | ||
566c09c5 SL |
6776 | batch_size = handle_active_stripes(conf, ANY_GROUP, NULL, |
6777 | conf->temp_inactive_list); | |
773ca82f | 6778 | if (!batch_size && !released) |
1da177e4 | 6779 | break; |
46a06401 | 6780 | handled += batch_size; |
1da177e4 | 6781 | |
2953079c | 6782 | if (mddev->sb_flags & ~(1 << MD_SB_CHANGE_PENDING)) { |
46a06401 | 6783 | spin_unlock_irq(&conf->device_lock); |
de393cde | 6784 | md_check_recovery(mddev); |
46a06401 | 6785 | spin_lock_irq(&conf->device_lock); |
5e2cf333 LG |
6786 | |
6787 | /* | |
6788 | * Waiting on MD_SB_CHANGE_PENDING below may deadlock | |
6789 | * seeing md_check_recovery() is needed to clear | |
6790 | * the flag when using mdmon. | |
6791 | */ | |
6792 | continue; | |
46a06401 | 6793 | } |
5e2cf333 LG |
6794 | |
6795 | wait_event_lock_irq(mddev->sb_wait, | |
6796 | !test_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags), | |
6797 | conf->device_lock); | |
1da177e4 | 6798 | } |
45b4233c | 6799 | pr_debug("%d stripes handled\n", handled); |
1da177e4 LT |
6800 | |
6801 | spin_unlock_irq(&conf->device_lock); | |
2d5b569b N |
6802 | if (test_and_clear_bit(R5_ALLOC_MORE, &conf->cache_state) && |
6803 | mutex_trylock(&conf->cache_size_mutex)) { | |
edbe83ab N |
6804 | grow_one_stripe(conf, __GFP_NOWARN); |
6805 | /* Set flag even if allocation failed. This helps | |
6806 | * slow down allocation requests when mem is short | |
6807 | */ | |
6808 | set_bit(R5_DID_ALLOC, &conf->cache_state); | |
2d5b569b | 6809 | mutex_unlock(&conf->cache_size_mutex); |
edbe83ab | 6810 | } |
1da177e4 | 6811 | |
765d704d SL |
6812 | flush_deferred_bios(conf); |
6813 | ||
0576b1c6 SL |
6814 | r5l_flush_stripe_to_raid(conf->log); |
6815 | ||
c9f21aaf | 6816 | async_tx_issue_pending_all(); |
e1dfa0a2 | 6817 | blk_finish_plug(&plug); |
1da177e4 | 6818 | |
45b4233c | 6819 | pr_debug("--- raid5d inactive\n"); |
1da177e4 LT |
6820 | } |
6821 | ||
3f294f4f | 6822 | static ssize_t |
fd01b88c | 6823 | raid5_show_stripe_cache_size(struct mddev *mddev, char *page) |
3f294f4f | 6824 | { |
7b1485ba N |
6825 | struct r5conf *conf; |
6826 | int ret = 0; | |
6827 | spin_lock(&mddev->lock); | |
6828 | conf = mddev->private; | |
96de1e66 | 6829 | if (conf) |
edbe83ab | 6830 | ret = sprintf(page, "%d\n", conf->min_nr_stripes); |
7b1485ba N |
6831 | spin_unlock(&mddev->lock); |
6832 | return ret; | |
3f294f4f N |
6833 | } |
6834 | ||
c41d4ac4 | 6835 | int |
fd01b88c | 6836 | raid5_set_cache_size(struct mddev *mddev, int size) |
3f294f4f | 6837 | { |
483cbbed | 6838 | int result = 0; |
d1688a6d | 6839 | struct r5conf *conf = mddev->private; |
b5470dc5 | 6840 | |
c41d4ac4 | 6841 | if (size <= 16 || size > 32768) |
3f294f4f | 6842 | return -EINVAL; |
486f0644 | 6843 | |
edbe83ab | 6844 | conf->min_nr_stripes = size; |
2d5b569b | 6845 | mutex_lock(&conf->cache_size_mutex); |
486f0644 N |
6846 | while (size < conf->max_nr_stripes && |
6847 | drop_one_stripe(conf)) | |
6848 | ; | |
2d5b569b | 6849 | mutex_unlock(&conf->cache_size_mutex); |
486f0644 | 6850 | |
2214c260 | 6851 | md_allow_write(mddev); |
486f0644 | 6852 | |
2d5b569b | 6853 | mutex_lock(&conf->cache_size_mutex); |
486f0644 | 6854 | while (size > conf->max_nr_stripes) |
483cbbed AN |
6855 | if (!grow_one_stripe(conf, GFP_KERNEL)) { |
6856 | conf->min_nr_stripes = conf->max_nr_stripes; | |
6857 | result = -ENOMEM; | |
486f0644 | 6858 | break; |
483cbbed | 6859 | } |
2d5b569b | 6860 | mutex_unlock(&conf->cache_size_mutex); |
486f0644 | 6861 | |
483cbbed | 6862 | return result; |
c41d4ac4 N |
6863 | } |
6864 | EXPORT_SYMBOL(raid5_set_cache_size); | |
6865 | ||
6866 | static ssize_t | |
fd01b88c | 6867 | raid5_store_stripe_cache_size(struct mddev *mddev, const char *page, size_t len) |
c41d4ac4 | 6868 | { |
6791875e | 6869 | struct r5conf *conf; |
c41d4ac4 N |
6870 | unsigned long new; |
6871 | int err; | |
6872 | ||
6873 | if (len >= PAGE_SIZE) | |
6874 | return -EINVAL; | |
b29bebd6 | 6875 | if (kstrtoul(page, 10, &new)) |
c41d4ac4 | 6876 | return -EINVAL; |
6791875e | 6877 | err = mddev_lock(mddev); |
c41d4ac4 N |
6878 | if (err) |
6879 | return err; | |
6791875e N |
6880 | conf = mddev->private; |
6881 | if (!conf) | |
6882 | err = -ENODEV; | |
6883 | else | |
6884 | err = raid5_set_cache_size(mddev, new); | |
6885 | mddev_unlock(mddev); | |
6886 | ||
6887 | return err ?: len; | |
3f294f4f | 6888 | } |
007583c9 | 6889 | |
96de1e66 N |
6890 | static struct md_sysfs_entry |
6891 | raid5_stripecache_size = __ATTR(stripe_cache_size, S_IRUGO | S_IWUSR, | |
6892 | raid5_show_stripe_cache_size, | |
6893 | raid5_store_stripe_cache_size); | |
3f294f4f | 6894 | |
d06f191f MS |
6895 | static ssize_t |
6896 | raid5_show_rmw_level(struct mddev *mddev, char *page) | |
6897 | { | |
6898 | struct r5conf *conf = mddev->private; | |
6899 | if (conf) | |
6900 | return sprintf(page, "%d\n", conf->rmw_level); | |
6901 | else | |
6902 | return 0; | |
6903 | } | |
6904 | ||
6905 | static ssize_t | |
6906 | raid5_store_rmw_level(struct mddev *mddev, const char *page, size_t len) | |
6907 | { | |
6908 | struct r5conf *conf = mddev->private; | |
6909 | unsigned long new; | |
6910 | ||
6911 | if (!conf) | |
6912 | return -ENODEV; | |
6913 | ||
6914 | if (len >= PAGE_SIZE) | |
6915 | return -EINVAL; | |
6916 | ||
6917 | if (kstrtoul(page, 10, &new)) | |
6918 | return -EINVAL; | |
6919 | ||
6920 | if (new != PARITY_DISABLE_RMW && !raid6_call.xor_syndrome) | |
6921 | return -EINVAL; | |
6922 | ||
6923 | if (new != PARITY_DISABLE_RMW && | |
6924 | new != PARITY_ENABLE_RMW && | |
6925 | new != PARITY_PREFER_RMW) | |
6926 | return -EINVAL; | |
6927 | ||
6928 | conf->rmw_level = new; | |
6929 | return len; | |
6930 | } | |
6931 | ||
6932 | static struct md_sysfs_entry | |
6933 | raid5_rmw_level = __ATTR(rmw_level, S_IRUGO | S_IWUSR, | |
6934 | raid5_show_rmw_level, | |
6935 | raid5_store_rmw_level); | |
6936 | ||
3b5408b9 YY |
6937 | static ssize_t |
6938 | raid5_show_stripe_size(struct mddev *mddev, char *page) | |
6939 | { | |
6940 | struct r5conf *conf; | |
6941 | int ret = 0; | |
6942 | ||
6943 | spin_lock(&mddev->lock); | |
6944 | conf = mddev->private; | |
6945 | if (conf) | |
6946 | ret = sprintf(page, "%lu\n", RAID5_STRIPE_SIZE(conf)); | |
6947 | spin_unlock(&mddev->lock); | |
6948 | return ret; | |
6949 | } | |
6950 | ||
6951 | #if PAGE_SIZE != DEFAULT_STRIPE_SIZE | |
6952 | static ssize_t | |
6953 | raid5_store_stripe_size(struct mddev *mddev, const char *page, size_t len) | |
6954 | { | |
6955 | struct r5conf *conf; | |
6956 | unsigned long new; | |
6957 | int err; | |
38912584 | 6958 | int size; |
3b5408b9 YY |
6959 | |
6960 | if (len >= PAGE_SIZE) | |
6961 | return -EINVAL; | |
6962 | if (kstrtoul(page, 10, &new)) | |
6963 | return -EINVAL; | |
6964 | ||
6965 | /* | |
6966 | * The value should not be bigger than PAGE_SIZE. It requires to | |
6af10a33 YY |
6967 | * be multiple of DEFAULT_STRIPE_SIZE and the value should be power |
6968 | * of two. | |
3b5408b9 | 6969 | */ |
6af10a33 YY |
6970 | if (new % DEFAULT_STRIPE_SIZE != 0 || |
6971 | new > PAGE_SIZE || new == 0 || | |
6972 | new != roundup_pow_of_two(new)) | |
3b5408b9 YY |
6973 | return -EINVAL; |
6974 | ||
6975 | err = mddev_lock(mddev); | |
6976 | if (err) | |
6977 | return err; | |
6978 | ||
6979 | conf = mddev->private; | |
6980 | if (!conf) { | |
6981 | err = -ENODEV; | |
6982 | goto out_unlock; | |
6983 | } | |
6984 | ||
6985 | if (new == conf->stripe_size) | |
6986 | goto out_unlock; | |
6987 | ||
6988 | pr_debug("md/raid: change stripe_size from %lu to %lu\n", | |
6989 | conf->stripe_size, new); | |
6990 | ||
38912584 YY |
6991 | if (mddev->sync_thread || |
6992 | test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) || | |
6993 | mddev->reshape_position != MaxSector || | |
6994 | mddev->sysfs_active) { | |
6995 | err = -EBUSY; | |
6996 | goto out_unlock; | |
6997 | } | |
6998 | ||
3b5408b9 | 6999 | mddev_suspend(mddev); |
38912584 YY |
7000 | mutex_lock(&conf->cache_size_mutex); |
7001 | size = conf->max_nr_stripes; | |
7002 | ||
7003 | shrink_stripes(conf); | |
7004 | ||
3b5408b9 YY |
7005 | conf->stripe_size = new; |
7006 | conf->stripe_shift = ilog2(new) - 9; | |
7007 | conf->stripe_sectors = new >> 9; | |
38912584 YY |
7008 | if (grow_stripes(conf, size)) { |
7009 | pr_warn("md/raid:%s: couldn't allocate buffers\n", | |
7010 | mdname(mddev)); | |
7011 | err = -ENOMEM; | |
7012 | } | |
7013 | mutex_unlock(&conf->cache_size_mutex); | |
3b5408b9 YY |
7014 | mddev_resume(mddev); |
7015 | ||
7016 | out_unlock: | |
7017 | mddev_unlock(mddev); | |
7018 | return err ?: len; | |
7019 | } | |
7020 | ||
7021 | static struct md_sysfs_entry | |
7022 | raid5_stripe_size = __ATTR(stripe_size, 0644, | |
7023 | raid5_show_stripe_size, | |
7024 | raid5_store_stripe_size); | |
7025 | #else | |
7026 | static struct md_sysfs_entry | |
7027 | raid5_stripe_size = __ATTR(stripe_size, 0444, | |
7028 | raid5_show_stripe_size, | |
7029 | NULL); | |
7030 | #endif | |
d06f191f | 7031 | |
8b3e6cdc | 7032 | static ssize_t |
fd01b88c | 7033 | raid5_show_preread_threshold(struct mddev *mddev, char *page) |
8b3e6cdc | 7034 | { |
7b1485ba N |
7035 | struct r5conf *conf; |
7036 | int ret = 0; | |
7037 | spin_lock(&mddev->lock); | |
7038 | conf = mddev->private; | |
8b3e6cdc | 7039 | if (conf) |
7b1485ba N |
7040 | ret = sprintf(page, "%d\n", conf->bypass_threshold); |
7041 | spin_unlock(&mddev->lock); | |
7042 | return ret; | |
8b3e6cdc DW |
7043 | } |
7044 | ||
7045 | static ssize_t | |
fd01b88c | 7046 | raid5_store_preread_threshold(struct mddev *mddev, const char *page, size_t len) |
8b3e6cdc | 7047 | { |
6791875e | 7048 | struct r5conf *conf; |
4ef197d8 | 7049 | unsigned long new; |
6791875e N |
7050 | int err; |
7051 | ||
8b3e6cdc DW |
7052 | if (len >= PAGE_SIZE) |
7053 | return -EINVAL; | |
b29bebd6 | 7054 | if (kstrtoul(page, 10, &new)) |
8b3e6cdc | 7055 | return -EINVAL; |
6791875e N |
7056 | |
7057 | err = mddev_lock(mddev); | |
7058 | if (err) | |
7059 | return err; | |
7060 | conf = mddev->private; | |
7061 | if (!conf) | |
7062 | err = -ENODEV; | |
edbe83ab | 7063 | else if (new > conf->min_nr_stripes) |
6791875e N |
7064 | err = -EINVAL; |
7065 | else | |
7066 | conf->bypass_threshold = new; | |
7067 | mddev_unlock(mddev); | |
7068 | return err ?: len; | |
8b3e6cdc DW |
7069 | } |
7070 | ||
7071 | static struct md_sysfs_entry | |
7072 | raid5_preread_bypass_threshold = __ATTR(preread_bypass_threshold, | |
7073 | S_IRUGO | S_IWUSR, | |
7074 | raid5_show_preread_threshold, | |
7075 | raid5_store_preread_threshold); | |
7076 | ||
d592a996 SL |
7077 | static ssize_t |
7078 | raid5_show_skip_copy(struct mddev *mddev, char *page) | |
7079 | { | |
7b1485ba N |
7080 | struct r5conf *conf; |
7081 | int ret = 0; | |
7082 | spin_lock(&mddev->lock); | |
7083 | conf = mddev->private; | |
d592a996 | 7084 | if (conf) |
7b1485ba N |
7085 | ret = sprintf(page, "%d\n", conf->skip_copy); |
7086 | spin_unlock(&mddev->lock); | |
7087 | return ret; | |
d592a996 SL |
7088 | } |
7089 | ||
7090 | static ssize_t | |
7091 | raid5_store_skip_copy(struct mddev *mddev, const char *page, size_t len) | |
7092 | { | |
6791875e | 7093 | struct r5conf *conf; |
d592a996 | 7094 | unsigned long new; |
6791875e N |
7095 | int err; |
7096 | ||
d592a996 SL |
7097 | if (len >= PAGE_SIZE) |
7098 | return -EINVAL; | |
d592a996 SL |
7099 | if (kstrtoul(page, 10, &new)) |
7100 | return -EINVAL; | |
7101 | new = !!new; | |
6791875e N |
7102 | |
7103 | err = mddev_lock(mddev); | |
7104 | if (err) | |
7105 | return err; | |
7106 | conf = mddev->private; | |
7107 | if (!conf) | |
7108 | err = -ENODEV; | |
7109 | else if (new != conf->skip_copy) { | |
1cb039f3 CH |
7110 | struct request_queue *q = mddev->queue; |
7111 | ||
6791875e N |
7112 | mddev_suspend(mddev); |
7113 | conf->skip_copy = new; | |
7114 | if (new) | |
1cb039f3 | 7115 | blk_queue_flag_set(QUEUE_FLAG_STABLE_WRITES, q); |
6791875e | 7116 | else |
1cb039f3 | 7117 | blk_queue_flag_clear(QUEUE_FLAG_STABLE_WRITES, q); |
6791875e N |
7118 | mddev_resume(mddev); |
7119 | } | |
7120 | mddev_unlock(mddev); | |
7121 | return err ?: len; | |
d592a996 SL |
7122 | } |
7123 | ||
7124 | static struct md_sysfs_entry | |
7125 | raid5_skip_copy = __ATTR(skip_copy, S_IRUGO | S_IWUSR, | |
7126 | raid5_show_skip_copy, | |
7127 | raid5_store_skip_copy); | |
7128 | ||
3f294f4f | 7129 | static ssize_t |
fd01b88c | 7130 | stripe_cache_active_show(struct mddev *mddev, char *page) |
3f294f4f | 7131 | { |
d1688a6d | 7132 | struct r5conf *conf = mddev->private; |
96de1e66 N |
7133 | if (conf) |
7134 | return sprintf(page, "%d\n", atomic_read(&conf->active_stripes)); | |
7135 | else | |
7136 | return 0; | |
3f294f4f N |
7137 | } |
7138 | ||
96de1e66 N |
7139 | static struct md_sysfs_entry |
7140 | raid5_stripecache_active = __ATTR_RO(stripe_cache_active); | |
3f294f4f | 7141 | |
b721420e SL |
7142 | static ssize_t |
7143 | raid5_show_group_thread_cnt(struct mddev *mddev, char *page) | |
7144 | { | |
7b1485ba N |
7145 | struct r5conf *conf; |
7146 | int ret = 0; | |
7147 | spin_lock(&mddev->lock); | |
7148 | conf = mddev->private; | |
b721420e | 7149 | if (conf) |
7b1485ba N |
7150 | ret = sprintf(page, "%d\n", conf->worker_cnt_per_group); |
7151 | spin_unlock(&mddev->lock); | |
7152 | return ret; | |
b721420e SL |
7153 | } |
7154 | ||
60aaf933 | 7155 | static int alloc_thread_groups(struct r5conf *conf, int cnt, |
7156 | int *group_cnt, | |
60aaf933 | 7157 | struct r5worker_group **worker_groups); |
b721420e SL |
7158 | static ssize_t |
7159 | raid5_store_group_thread_cnt(struct mddev *mddev, const char *page, size_t len) | |
7160 | { | |
6791875e | 7161 | struct r5conf *conf; |
7d5d7b50 | 7162 | unsigned int new; |
b721420e | 7163 | int err; |
60aaf933 | 7164 | struct r5worker_group *new_groups, *old_groups; |
d2c9ad41 | 7165 | int group_cnt; |
b721420e SL |
7166 | |
7167 | if (len >= PAGE_SIZE) | |
7168 | return -EINVAL; | |
7d5d7b50 SL |
7169 | if (kstrtouint(page, 10, &new)) |
7170 | return -EINVAL; | |
7171 | /* 8192 should be big enough */ | |
7172 | if (new > 8192) | |
b721420e SL |
7173 | return -EINVAL; |
7174 | ||
6791875e N |
7175 | err = mddev_lock(mddev); |
7176 | if (err) | |
7177 | return err; | |
7178 | conf = mddev->private; | |
7179 | if (!conf) | |
7180 | err = -ENODEV; | |
7181 | else if (new != conf->worker_cnt_per_group) { | |
7182 | mddev_suspend(mddev); | |
b721420e | 7183 | |
6791875e N |
7184 | old_groups = conf->worker_groups; |
7185 | if (old_groups) | |
7186 | flush_workqueue(raid5_wq); | |
d206dcfa | 7187 | |
d2c9ad41 | 7188 | err = alloc_thread_groups(conf, new, &group_cnt, &new_groups); |
6791875e N |
7189 | if (!err) { |
7190 | spin_lock_irq(&conf->device_lock); | |
7191 | conf->group_cnt = group_cnt; | |
d2c9ad41 | 7192 | conf->worker_cnt_per_group = new; |
6791875e N |
7193 | conf->worker_groups = new_groups; |
7194 | spin_unlock_irq(&conf->device_lock); | |
b721420e | 7195 | |
6791875e N |
7196 | if (old_groups) |
7197 | kfree(old_groups[0].workers); | |
7198 | kfree(old_groups); | |
7199 | } | |
7200 | mddev_resume(mddev); | |
b721420e | 7201 | } |
6791875e | 7202 | mddev_unlock(mddev); |
b721420e | 7203 | |
6791875e | 7204 | return err ?: len; |
b721420e SL |
7205 | } |
7206 | ||
7207 | static struct md_sysfs_entry | |
7208 | raid5_group_thread_cnt = __ATTR(group_thread_cnt, S_IRUGO | S_IWUSR, | |
7209 | raid5_show_group_thread_cnt, | |
7210 | raid5_store_group_thread_cnt); | |
7211 | ||
007583c9 | 7212 | static struct attribute *raid5_attrs[] = { |
3f294f4f N |
7213 | &raid5_stripecache_size.attr, |
7214 | &raid5_stripecache_active.attr, | |
8b3e6cdc | 7215 | &raid5_preread_bypass_threshold.attr, |
b721420e | 7216 | &raid5_group_thread_cnt.attr, |
d592a996 | 7217 | &raid5_skip_copy.attr, |
d06f191f | 7218 | &raid5_rmw_level.attr, |
3b5408b9 | 7219 | &raid5_stripe_size.attr, |
2c7da14b | 7220 | &r5c_journal_mode.attr, |
a596d086 | 7221 | &ppl_write_hint.attr, |
3f294f4f N |
7222 | NULL, |
7223 | }; | |
c32dc040 | 7224 | static const struct attribute_group raid5_attrs_group = { |
007583c9 N |
7225 | .name = NULL, |
7226 | .attrs = raid5_attrs, | |
3f294f4f N |
7227 | }; |
7228 | ||
d2c9ad41 | 7229 | static int alloc_thread_groups(struct r5conf *conf, int cnt, int *group_cnt, |
60aaf933 | 7230 | struct r5worker_group **worker_groups) |
851c30c9 | 7231 | { |
566c09c5 | 7232 | int i, j, k; |
851c30c9 SL |
7233 | ssize_t size; |
7234 | struct r5worker *workers; | |
7235 | ||
851c30c9 | 7236 | if (cnt == 0) { |
60aaf933 | 7237 | *group_cnt = 0; |
7238 | *worker_groups = NULL; | |
851c30c9 SL |
7239 | return 0; |
7240 | } | |
60aaf933 | 7241 | *group_cnt = num_possible_nodes(); |
851c30c9 | 7242 | size = sizeof(struct r5worker) * cnt; |
6396bb22 KC |
7243 | workers = kcalloc(size, *group_cnt, GFP_NOIO); |
7244 | *worker_groups = kcalloc(*group_cnt, sizeof(struct r5worker_group), | |
7245 | GFP_NOIO); | |
60aaf933 | 7246 | if (!*worker_groups || !workers) { |
851c30c9 | 7247 | kfree(workers); |
60aaf933 | 7248 | kfree(*worker_groups); |
851c30c9 SL |
7249 | return -ENOMEM; |
7250 | } | |
7251 | ||
60aaf933 | 7252 | for (i = 0; i < *group_cnt; i++) { |
851c30c9 SL |
7253 | struct r5worker_group *group; |
7254 | ||
0c775d52 | 7255 | group = &(*worker_groups)[i]; |
851c30c9 | 7256 | INIT_LIST_HEAD(&group->handle_list); |
535ae4eb | 7257 | INIT_LIST_HEAD(&group->loprio_list); |
851c30c9 SL |
7258 | group->conf = conf; |
7259 | group->workers = workers + i * cnt; | |
7260 | ||
7261 | for (j = 0; j < cnt; j++) { | |
566c09c5 SL |
7262 | struct r5worker *worker = group->workers + j; |
7263 | worker->group = group; | |
7264 | INIT_WORK(&worker->work, raid5_do_work); | |
7265 | ||
7266 | for (k = 0; k < NR_STRIPE_HASH_LOCKS; k++) | |
7267 | INIT_LIST_HEAD(worker->temp_inactive_list + k); | |
851c30c9 SL |
7268 | } |
7269 | } | |
7270 | ||
7271 | return 0; | |
7272 | } | |
7273 | ||
7274 | static void free_thread_groups(struct r5conf *conf) | |
7275 | { | |
7276 | if (conf->worker_groups) | |
7277 | kfree(conf->worker_groups[0].workers); | |
7278 | kfree(conf->worker_groups); | |
7279 | conf->worker_groups = NULL; | |
7280 | } | |
7281 | ||
80c3a6ce | 7282 | static sector_t |
fd01b88c | 7283 | raid5_size(struct mddev *mddev, sector_t sectors, int raid_disks) |
80c3a6ce | 7284 | { |
d1688a6d | 7285 | struct r5conf *conf = mddev->private; |
80c3a6ce DW |
7286 | |
7287 | if (!sectors) | |
7288 | sectors = mddev->dev_sectors; | |
5e5e3e78 | 7289 | if (!raid_disks) |
7ec05478 | 7290 | /* size is defined by the smallest of previous and new size */ |
5e5e3e78 | 7291 | raid_disks = min(conf->raid_disks, conf->previous_raid_disks); |
80c3a6ce | 7292 | |
3cb5edf4 N |
7293 | sectors &= ~((sector_t)conf->chunk_sectors - 1); |
7294 | sectors &= ~((sector_t)conf->prev_chunk_sectors - 1); | |
80c3a6ce DW |
7295 | return sectors * (raid_disks - conf->max_degraded); |
7296 | } | |
7297 | ||
789b5e03 ON |
7298 | static void free_scratch_buffer(struct r5conf *conf, struct raid5_percpu *percpu) |
7299 | { | |
7300 | safe_put_page(percpu->spare_page); | |
789b5e03 | 7301 | percpu->spare_page = NULL; |
b330e6a4 | 7302 | kvfree(percpu->scribble); |
789b5e03 ON |
7303 | percpu->scribble = NULL; |
7304 | } | |
7305 | ||
7306 | static int alloc_scratch_buffer(struct r5conf *conf, struct raid5_percpu *percpu) | |
7307 | { | |
b330e6a4 | 7308 | if (conf->level == 6 && !percpu->spare_page) { |
789b5e03 | 7309 | percpu->spare_page = alloc_page(GFP_KERNEL); |
b330e6a4 KO |
7310 | if (!percpu->spare_page) |
7311 | return -ENOMEM; | |
7312 | } | |
7313 | ||
7314 | if (scribble_alloc(percpu, | |
7315 | max(conf->raid_disks, | |
7316 | conf->previous_raid_disks), | |
7317 | max(conf->chunk_sectors, | |
7318 | conf->prev_chunk_sectors) | |
c911c46c | 7319 | / RAID5_STRIPE_SECTORS(conf))) { |
789b5e03 ON |
7320 | free_scratch_buffer(conf, percpu); |
7321 | return -ENOMEM; | |
7322 | } | |
7323 | ||
770b1d21 | 7324 | local_lock_init(&percpu->lock); |
789b5e03 ON |
7325 | return 0; |
7326 | } | |
7327 | ||
29c6d1bb | 7328 | static int raid456_cpu_dead(unsigned int cpu, struct hlist_node *node) |
36d1c647 | 7329 | { |
29c6d1bb SAS |
7330 | struct r5conf *conf = hlist_entry_safe(node, struct r5conf, node); |
7331 | ||
7332 | free_scratch_buffer(conf, per_cpu_ptr(conf->percpu, cpu)); | |
7333 | return 0; | |
7334 | } | |
36d1c647 | 7335 | |
29c6d1bb SAS |
7336 | static void raid5_free_percpu(struct r5conf *conf) |
7337 | { | |
36d1c647 DW |
7338 | if (!conf->percpu) |
7339 | return; | |
7340 | ||
29c6d1bb | 7341 | cpuhp_state_remove_instance(CPUHP_MD_RAID5_PREPARE, &conf->node); |
36d1c647 DW |
7342 | free_percpu(conf->percpu); |
7343 | } | |
7344 | ||
d1688a6d | 7345 | static void free_conf(struct r5conf *conf) |
95fc17aa | 7346 | { |
d7bd398e SL |
7347 | int i; |
7348 | ||
ff875738 AP |
7349 | log_exit(conf); |
7350 | ||
565e0450 | 7351 | unregister_shrinker(&conf->shrinker); |
851c30c9 | 7352 | free_thread_groups(conf); |
95fc17aa | 7353 | shrink_stripes(conf); |
36d1c647 | 7354 | raid5_free_percpu(conf); |
d7bd398e SL |
7355 | for (i = 0; i < conf->pool_size; i++) |
7356 | if (conf->disks[i].extra_page) | |
7357 | put_page(conf->disks[i].extra_page); | |
95fc17aa | 7358 | kfree(conf->disks); |
afeee514 | 7359 | bioset_exit(&conf->bio_split); |
95fc17aa | 7360 | kfree(conf->stripe_hashtbl); |
aaf9f12e | 7361 | kfree(conf->pending_data); |
95fc17aa DW |
7362 | kfree(conf); |
7363 | } | |
7364 | ||
29c6d1bb | 7365 | static int raid456_cpu_up_prepare(unsigned int cpu, struct hlist_node *node) |
36d1c647 | 7366 | { |
29c6d1bb | 7367 | struct r5conf *conf = hlist_entry_safe(node, struct r5conf, node); |
36d1c647 DW |
7368 | struct raid5_percpu *percpu = per_cpu_ptr(conf->percpu, cpu); |
7369 | ||
29c6d1bb | 7370 | if (alloc_scratch_buffer(conf, percpu)) { |
cc6167b4 N |
7371 | pr_warn("%s: failed memory allocation for cpu%u\n", |
7372 | __func__, cpu); | |
29c6d1bb | 7373 | return -ENOMEM; |
36d1c647 | 7374 | } |
29c6d1bb | 7375 | return 0; |
36d1c647 | 7376 | } |
36d1c647 | 7377 | |
d1688a6d | 7378 | static int raid5_alloc_percpu(struct r5conf *conf) |
36d1c647 | 7379 | { |
789b5e03 | 7380 | int err = 0; |
36d1c647 | 7381 | |
789b5e03 ON |
7382 | conf->percpu = alloc_percpu(struct raid5_percpu); |
7383 | if (!conf->percpu) | |
36d1c647 | 7384 | return -ENOMEM; |
789b5e03 | 7385 | |
29c6d1bb | 7386 | err = cpuhp_state_add_instance(CPUHP_MD_RAID5_PREPARE, &conf->node); |
27a353c0 SL |
7387 | if (!err) { |
7388 | conf->scribble_disks = max(conf->raid_disks, | |
7389 | conf->previous_raid_disks); | |
7390 | conf->scribble_sectors = max(conf->chunk_sectors, | |
7391 | conf->prev_chunk_sectors); | |
7392 | } | |
36d1c647 DW |
7393 | return err; |
7394 | } | |
7395 | ||
edbe83ab N |
7396 | static unsigned long raid5_cache_scan(struct shrinker *shrink, |
7397 | struct shrink_control *sc) | |
7398 | { | |
7399 | struct r5conf *conf = container_of(shrink, struct r5conf, shrinker); | |
2d5b569b N |
7400 | unsigned long ret = SHRINK_STOP; |
7401 | ||
7402 | if (mutex_trylock(&conf->cache_size_mutex)) { | |
7403 | ret= 0; | |
49895bcc N |
7404 | while (ret < sc->nr_to_scan && |
7405 | conf->max_nr_stripes > conf->min_nr_stripes) { | |
2d5b569b N |
7406 | if (drop_one_stripe(conf) == 0) { |
7407 | ret = SHRINK_STOP; | |
7408 | break; | |
7409 | } | |
7410 | ret++; | |
7411 | } | |
7412 | mutex_unlock(&conf->cache_size_mutex); | |
edbe83ab N |
7413 | } |
7414 | return ret; | |
7415 | } | |
7416 | ||
7417 | static unsigned long raid5_cache_count(struct shrinker *shrink, | |
7418 | struct shrink_control *sc) | |
7419 | { | |
7420 | struct r5conf *conf = container_of(shrink, struct r5conf, shrinker); | |
7421 | ||
7422 | if (conf->max_nr_stripes < conf->min_nr_stripes) | |
7423 | /* unlikely, but not impossible */ | |
7424 | return 0; | |
7425 | return conf->max_nr_stripes - conf->min_nr_stripes; | |
7426 | } | |
7427 | ||
d1688a6d | 7428 | static struct r5conf *setup_conf(struct mddev *mddev) |
1da177e4 | 7429 | { |
d1688a6d | 7430 | struct r5conf *conf; |
5e5e3e78 | 7431 | int raid_disk, memory, max_disks; |
3cb03002 | 7432 | struct md_rdev *rdev; |
1da177e4 | 7433 | struct disk_info *disk; |
0232605d | 7434 | char pers_name[6]; |
566c09c5 | 7435 | int i; |
d2c9ad41 | 7436 | int group_cnt; |
60aaf933 | 7437 | struct r5worker_group *new_group; |
8fbcba6b | 7438 | int ret = -ENOMEM; |
1da177e4 | 7439 | |
91adb564 N |
7440 | if (mddev->new_level != 5 |
7441 | && mddev->new_level != 4 | |
7442 | && mddev->new_level != 6) { | |
cc6167b4 N |
7443 | pr_warn("md/raid:%s: raid level not set to 4/5/6 (%d)\n", |
7444 | mdname(mddev), mddev->new_level); | |
91adb564 | 7445 | return ERR_PTR(-EIO); |
1da177e4 | 7446 | } |
91adb564 N |
7447 | if ((mddev->new_level == 5 |
7448 | && !algorithm_valid_raid5(mddev->new_layout)) || | |
7449 | (mddev->new_level == 6 | |
7450 | && !algorithm_valid_raid6(mddev->new_layout))) { | |
cc6167b4 N |
7451 | pr_warn("md/raid:%s: layout %d not supported\n", |
7452 | mdname(mddev), mddev->new_layout); | |
91adb564 | 7453 | return ERR_PTR(-EIO); |
99c0fb5f | 7454 | } |
91adb564 | 7455 | if (mddev->new_level == 6 && mddev->raid_disks < 4) { |
cc6167b4 N |
7456 | pr_warn("md/raid:%s: not enough configured devices (%d, minimum 4)\n", |
7457 | mdname(mddev), mddev->raid_disks); | |
91adb564 | 7458 | return ERR_PTR(-EINVAL); |
4bbf3771 N |
7459 | } |
7460 | ||
664e7c41 AN |
7461 | if (!mddev->new_chunk_sectors || |
7462 | (mddev->new_chunk_sectors << 9) % PAGE_SIZE || | |
7463 | !is_power_of_2(mddev->new_chunk_sectors)) { | |
cc6167b4 N |
7464 | pr_warn("md/raid:%s: invalid chunk size %d\n", |
7465 | mdname(mddev), mddev->new_chunk_sectors << 9); | |
91adb564 | 7466 | return ERR_PTR(-EINVAL); |
f6705578 N |
7467 | } |
7468 | ||
d1688a6d | 7469 | conf = kzalloc(sizeof(struct r5conf), GFP_KERNEL); |
91adb564 | 7470 | if (conf == NULL) |
1da177e4 | 7471 | goto abort; |
c911c46c | 7472 | |
e2368582 YY |
7473 | #if PAGE_SIZE != DEFAULT_STRIPE_SIZE |
7474 | conf->stripe_size = DEFAULT_STRIPE_SIZE; | |
7475 | conf->stripe_shift = ilog2(DEFAULT_STRIPE_SIZE) - 9; | |
7476 | conf->stripe_sectors = DEFAULT_STRIPE_SIZE >> 9; | |
7477 | #endif | |
aaf9f12e SL |
7478 | INIT_LIST_HEAD(&conf->free_list); |
7479 | INIT_LIST_HEAD(&conf->pending_list); | |
6396bb22 KC |
7480 | conf->pending_data = kcalloc(PENDING_IO_MAX, |
7481 | sizeof(struct r5pending_data), | |
7482 | GFP_KERNEL); | |
aaf9f12e SL |
7483 | if (!conf->pending_data) |
7484 | goto abort; | |
7485 | for (i = 0; i < PENDING_IO_MAX; i++) | |
7486 | list_add(&conf->pending_data[i].sibling, &conf->free_list); | |
851c30c9 | 7487 | /* Don't enable multi-threading by default*/ |
d2c9ad41 | 7488 | if (!alloc_thread_groups(conf, 0, &group_cnt, &new_group)) { |
60aaf933 | 7489 | conf->group_cnt = group_cnt; |
d2c9ad41 | 7490 | conf->worker_cnt_per_group = 0; |
60aaf933 | 7491 | conf->worker_groups = new_group; |
7492 | } else | |
851c30c9 | 7493 | goto abort; |
f5efd45a | 7494 | spin_lock_init(&conf->device_lock); |
0a87b25f | 7495 | seqcount_spinlock_init(&conf->gen_lock, &conf->device_lock); |
2d5b569b | 7496 | mutex_init(&conf->cache_size_mutex); |
8fbcba6b | 7497 | |
b1b46486 | 7498 | init_waitqueue_head(&conf->wait_for_quiescent); |
6ab2a4b8 | 7499 | init_waitqueue_head(&conf->wait_for_stripe); |
f5efd45a DW |
7500 | init_waitqueue_head(&conf->wait_for_overlap); |
7501 | INIT_LIST_HEAD(&conf->handle_list); | |
535ae4eb | 7502 | INIT_LIST_HEAD(&conf->loprio_list); |
f5efd45a DW |
7503 | INIT_LIST_HEAD(&conf->hold_list); |
7504 | INIT_LIST_HEAD(&conf->delayed_list); | |
7505 | INIT_LIST_HEAD(&conf->bitmap_list); | |
773ca82f | 7506 | init_llist_head(&conf->released_stripes); |
f5efd45a DW |
7507 | atomic_set(&conf->active_stripes, 0); |
7508 | atomic_set(&conf->preread_active_stripes, 0); | |
7509 | atomic_set(&conf->active_aligned_reads, 0); | |
765d704d SL |
7510 | spin_lock_init(&conf->pending_bios_lock); |
7511 | conf->batch_bio_dispatch = true; | |
7512 | rdev_for_each(rdev, mddev) { | |
7513 | if (test_bit(Journal, &rdev->flags)) | |
7514 | continue; | |
10f0d2a5 | 7515 | if (bdev_nonrot(rdev->bdev)) { |
765d704d SL |
7516 | conf->batch_bio_dispatch = false; |
7517 | break; | |
7518 | } | |
7519 | } | |
7520 | ||
f5efd45a | 7521 | conf->bypass_threshold = BYPASS_THRESHOLD; |
d890fa2b | 7522 | conf->recovery_disabled = mddev->recovery_disabled - 1; |
91adb564 N |
7523 | |
7524 | conf->raid_disks = mddev->raid_disks; | |
7525 | if (mddev->reshape_position == MaxSector) | |
7526 | conf->previous_raid_disks = mddev->raid_disks; | |
7527 | else | |
f6705578 | 7528 | conf->previous_raid_disks = mddev->raid_disks - mddev->delta_disks; |
5e5e3e78 | 7529 | max_disks = max(conf->raid_disks, conf->previous_raid_disks); |
f6705578 | 7530 | |
6396bb22 | 7531 | conf->disks = kcalloc(max_disks, sizeof(struct disk_info), |
b55e6bfc | 7532 | GFP_KERNEL); |
d7bd398e | 7533 | |
b55e6bfc N |
7534 | if (!conf->disks) |
7535 | goto abort; | |
9ffae0cf | 7536 | |
d7bd398e SL |
7537 | for (i = 0; i < max_disks; i++) { |
7538 | conf->disks[i].extra_page = alloc_page(GFP_KERNEL); | |
7539 | if (!conf->disks[i].extra_page) | |
7540 | goto abort; | |
7541 | } | |
7542 | ||
afeee514 KO |
7543 | ret = bioset_init(&conf->bio_split, BIO_POOL_SIZE, 0, 0); |
7544 | if (ret) | |
dd7a8f5d | 7545 | goto abort; |
1da177e4 LT |
7546 | conf->mddev = mddev; |
7547 | ||
5f7ef487 DC |
7548 | ret = -ENOMEM; |
7549 | conf->stripe_hashtbl = kzalloc(PAGE_SIZE, GFP_KERNEL); | |
7550 | if (!conf->stripe_hashtbl) | |
1da177e4 | 7551 | goto abort; |
1da177e4 | 7552 | |
566c09c5 SL |
7553 | /* We init hash_locks[0] separately to that it can be used |
7554 | * as the reference lock in the spin_lock_nest_lock() call | |
7555 | * in lock_all_device_hash_locks_irq in order to convince | |
7556 | * lockdep that we know what we are doing. | |
7557 | */ | |
7558 | spin_lock_init(conf->hash_locks); | |
7559 | for (i = 1; i < NR_STRIPE_HASH_LOCKS; i++) | |
7560 | spin_lock_init(conf->hash_locks + i); | |
7561 | ||
7562 | for (i = 0; i < NR_STRIPE_HASH_LOCKS; i++) | |
7563 | INIT_LIST_HEAD(conf->inactive_list + i); | |
7564 | ||
7565 | for (i = 0; i < NR_STRIPE_HASH_LOCKS; i++) | |
7566 | INIT_LIST_HEAD(conf->temp_inactive_list + i); | |
7567 | ||
1e6d690b SL |
7568 | atomic_set(&conf->r5c_cached_full_stripes, 0); |
7569 | INIT_LIST_HEAD(&conf->r5c_full_stripe_list); | |
7570 | atomic_set(&conf->r5c_cached_partial_stripes, 0); | |
7571 | INIT_LIST_HEAD(&conf->r5c_partial_stripe_list); | |
e33fbb9c SL |
7572 | atomic_set(&conf->r5c_flushing_full_stripes, 0); |
7573 | atomic_set(&conf->r5c_flushing_partial_stripes, 0); | |
1e6d690b | 7574 | |
36d1c647 | 7575 | conf->level = mddev->new_level; |
46d5b785 | 7576 | conf->chunk_sectors = mddev->new_chunk_sectors; |
8fbcba6b LG |
7577 | ret = raid5_alloc_percpu(conf); |
7578 | if (ret) | |
36d1c647 DW |
7579 | goto abort; |
7580 | ||
0c55e022 | 7581 | pr_debug("raid456: run(%s) called.\n", mdname(mddev)); |
1da177e4 | 7582 | |
8fbcba6b | 7583 | ret = -EIO; |
dafb20fa | 7584 | rdev_for_each(rdev, mddev) { |
1da177e4 | 7585 | raid_disk = rdev->raid_disk; |
5e5e3e78 | 7586 | if (raid_disk >= max_disks |
f2076e7d | 7587 | || raid_disk < 0 || test_bit(Journal, &rdev->flags)) |
1da177e4 LT |
7588 | continue; |
7589 | disk = conf->disks + raid_disk; | |
7590 | ||
17045f52 N |
7591 | if (test_bit(Replacement, &rdev->flags)) { |
7592 | if (disk->replacement) | |
7593 | goto abort; | |
b0920ede | 7594 | RCU_INIT_POINTER(disk->replacement, rdev); |
17045f52 N |
7595 | } else { |
7596 | if (disk->rdev) | |
7597 | goto abort; | |
b0920ede | 7598 | RCU_INIT_POINTER(disk->rdev, rdev); |
17045f52 | 7599 | } |
1da177e4 | 7600 | |
b2d444d7 | 7601 | if (test_bit(In_sync, &rdev->flags)) { |
913cce5a CH |
7602 | pr_info("md/raid:%s: device %pg operational as raid disk %d\n", |
7603 | mdname(mddev), rdev->bdev, raid_disk); | |
d6b212f4 | 7604 | } else if (rdev->saved_raid_disk != raid_disk) |
8c2e870a NB |
7605 | /* Cannot rely on bitmap to complete recovery */ |
7606 | conf->fullsync = 1; | |
1da177e4 LT |
7607 | } |
7608 | ||
91adb564 | 7609 | conf->level = mddev->new_level; |
584acdd4 | 7610 | if (conf->level == 6) { |
16a53ecc | 7611 | conf->max_degraded = 2; |
584acdd4 MS |
7612 | if (raid6_call.xor_syndrome) |
7613 | conf->rmw_level = PARITY_ENABLE_RMW; | |
7614 | else | |
7615 | conf->rmw_level = PARITY_DISABLE_RMW; | |
7616 | } else { | |
16a53ecc | 7617 | conf->max_degraded = 1; |
584acdd4 MS |
7618 | conf->rmw_level = PARITY_ENABLE_RMW; |
7619 | } | |
91adb564 | 7620 | conf->algorithm = mddev->new_layout; |
fef9c61f | 7621 | conf->reshape_progress = mddev->reshape_position; |
e183eaed | 7622 | if (conf->reshape_progress != MaxSector) { |
09c9e5fa | 7623 | conf->prev_chunk_sectors = mddev->chunk_sectors; |
e183eaed | 7624 | conf->prev_algo = mddev->layout; |
5cac6bcb N |
7625 | } else { |
7626 | conf->prev_chunk_sectors = conf->chunk_sectors; | |
7627 | conf->prev_algo = conf->algorithm; | |
e183eaed | 7628 | } |
1da177e4 | 7629 | |
edbe83ab | 7630 | conf->min_nr_stripes = NR_STRIPES; |
ad5b0f76 SL |
7631 | if (mddev->reshape_position != MaxSector) { |
7632 | int stripes = max_t(int, | |
c911c46c YY |
7633 | ((mddev->chunk_sectors << 9) / RAID5_STRIPE_SIZE(conf)) * 4, |
7634 | ((mddev->new_chunk_sectors << 9) / RAID5_STRIPE_SIZE(conf)) * 4); | |
ad5b0f76 SL |
7635 | conf->min_nr_stripes = max(NR_STRIPES, stripes); |
7636 | if (conf->min_nr_stripes != NR_STRIPES) | |
cc6167b4 | 7637 | pr_info("md/raid:%s: force stripe size %d for reshape\n", |
ad5b0f76 SL |
7638 | mdname(mddev), conf->min_nr_stripes); |
7639 | } | |
edbe83ab | 7640 | memory = conf->min_nr_stripes * (sizeof(struct stripe_head) + |
5e5e3e78 | 7641 | max_disks * ((sizeof(struct bio) + PAGE_SIZE))) / 1024; |
4bda556a | 7642 | atomic_set(&conf->empty_inactive_list_nr, NR_STRIPE_HASH_LOCKS); |
edbe83ab | 7643 | if (grow_stripes(conf, conf->min_nr_stripes)) { |
cc6167b4 N |
7644 | pr_warn("md/raid:%s: couldn't allocate %dkB for buffers\n", |
7645 | mdname(mddev), memory); | |
8fbcba6b | 7646 | ret = -ENOMEM; |
91adb564 N |
7647 | goto abort; |
7648 | } else | |
cc6167b4 | 7649 | pr_debug("md/raid:%s: allocated %dkB\n", mdname(mddev), memory); |
edbe83ab N |
7650 | /* |
7651 | * Losing a stripe head costs more than the time to refill it, | |
7652 | * it reduces the queue depth and so can hurt throughput. | |
7653 | * So set it rather large, scaled by number of devices. | |
7654 | */ | |
7655 | conf->shrinker.seeks = DEFAULT_SEEKS * conf->raid_disks * 4; | |
7656 | conf->shrinker.scan_objects = raid5_cache_scan; | |
7657 | conf->shrinker.count_objects = raid5_cache_count; | |
7658 | conf->shrinker.batch = 128; | |
7659 | conf->shrinker.flags = 0; | |
e33c267a | 7660 | ret = register_shrinker(&conf->shrinker, "md-raid5:%s", mdname(mddev)); |
8fbcba6b | 7661 | if (ret) { |
cc6167b4 N |
7662 | pr_warn("md/raid:%s: couldn't register shrinker.\n", |
7663 | mdname(mddev)); | |
6a0f53ff CY |
7664 | goto abort; |
7665 | } | |
1da177e4 | 7666 | |
0232605d N |
7667 | sprintf(pers_name, "raid%d", mddev->new_level); |
7668 | conf->thread = md_register_thread(raid5d, mddev, pers_name); | |
91adb564 | 7669 | if (!conf->thread) { |
cc6167b4 N |
7670 | pr_warn("md/raid:%s: couldn't allocate thread.\n", |
7671 | mdname(mddev)); | |
8fbcba6b | 7672 | ret = -ENOMEM; |
16a53ecc N |
7673 | goto abort; |
7674 | } | |
91adb564 N |
7675 | |
7676 | return conf; | |
7677 | ||
7678 | abort: | |
8fbcba6b | 7679 | if (conf) |
95fc17aa | 7680 | free_conf(conf); |
8fbcba6b | 7681 | return ERR_PTR(ret); |
91adb564 N |
7682 | } |
7683 | ||
c148ffdc N |
7684 | static int only_parity(int raid_disk, int algo, int raid_disks, int max_degraded) |
7685 | { | |
7686 | switch (algo) { | |
7687 | case ALGORITHM_PARITY_0: | |
7688 | if (raid_disk < max_degraded) | |
7689 | return 1; | |
7690 | break; | |
7691 | case ALGORITHM_PARITY_N: | |
7692 | if (raid_disk >= raid_disks - max_degraded) | |
7693 | return 1; | |
7694 | break; | |
7695 | case ALGORITHM_PARITY_0_6: | |
f72ffdd6 | 7696 | if (raid_disk == 0 || |
c148ffdc N |
7697 | raid_disk == raid_disks - 1) |
7698 | return 1; | |
7699 | break; | |
7700 | case ALGORITHM_LEFT_ASYMMETRIC_6: | |
7701 | case ALGORITHM_RIGHT_ASYMMETRIC_6: | |
7702 | case ALGORITHM_LEFT_SYMMETRIC_6: | |
7703 | case ALGORITHM_RIGHT_SYMMETRIC_6: | |
7704 | if (raid_disk == raid_disks - 1) | |
7705 | return 1; | |
7706 | } | |
7707 | return 0; | |
7708 | } | |
7709 | ||
16ef5101 CH |
7710 | static void raid5_set_io_opt(struct r5conf *conf) |
7711 | { | |
7712 | blk_queue_io_opt(conf->mddev->queue, (conf->chunk_sectors << 9) * | |
7713 | (conf->raid_disks - conf->max_degraded)); | |
7714 | } | |
7715 | ||
849674e4 | 7716 | static int raid5_run(struct mddev *mddev) |
91adb564 | 7717 | { |
d1688a6d | 7718 | struct r5conf *conf; |
c148ffdc | 7719 | int dirty_parity_disks = 0; |
3cb03002 | 7720 | struct md_rdev *rdev; |
713cf5a6 | 7721 | struct md_rdev *journal_dev = NULL; |
c148ffdc | 7722 | sector_t reshape_offset = 0; |
0c031fd3 | 7723 | int i, ret = 0; |
b5254dd5 N |
7724 | long long min_offset_diff = 0; |
7725 | int first = 1; | |
91adb564 | 7726 | |
0c031fd3 XN |
7727 | if (acct_bioset_init(mddev)) { |
7728 | pr_err("md/raid456:%s: alloc acct bioset failed.\n", mdname(mddev)); | |
a415c0f1 | 7729 | return -ENOMEM; |
0c031fd3 XN |
7730 | } |
7731 | ||
7732 | if (mddev_init_writes_pending(mddev) < 0) { | |
7733 | ret = -ENOMEM; | |
7734 | goto exit_acct_set; | |
7735 | } | |
a415c0f1 | 7736 | |
8c6ac868 | 7737 | if (mddev->recovery_cp != MaxSector) |
cc6167b4 N |
7738 | pr_notice("md/raid:%s: not clean -- starting background reconstruction\n", |
7739 | mdname(mddev)); | |
b5254dd5 N |
7740 | |
7741 | rdev_for_each(rdev, mddev) { | |
7742 | long long diff; | |
713cf5a6 | 7743 | |
f2076e7d | 7744 | if (test_bit(Journal, &rdev->flags)) { |
713cf5a6 | 7745 | journal_dev = rdev; |
f2076e7d SL |
7746 | continue; |
7747 | } | |
b5254dd5 N |
7748 | if (rdev->raid_disk < 0) |
7749 | continue; | |
7750 | diff = (rdev->new_data_offset - rdev->data_offset); | |
7751 | if (first) { | |
7752 | min_offset_diff = diff; | |
7753 | first = 0; | |
7754 | } else if (mddev->reshape_backwards && | |
7755 | diff < min_offset_diff) | |
7756 | min_offset_diff = diff; | |
7757 | else if (!mddev->reshape_backwards && | |
7758 | diff > min_offset_diff) | |
7759 | min_offset_diff = diff; | |
7760 | } | |
7761 | ||
230b55fa N |
7762 | if ((test_bit(MD_HAS_JOURNAL, &mddev->flags) || journal_dev) && |
7763 | (mddev->bitmap_info.offset || mddev->bitmap_info.file)) { | |
7764 | pr_notice("md/raid:%s: array cannot have both journal and bitmap\n", | |
7765 | mdname(mddev)); | |
0c031fd3 XN |
7766 | ret = -EINVAL; |
7767 | goto exit_acct_set; | |
230b55fa N |
7768 | } |
7769 | ||
91adb564 N |
7770 | if (mddev->reshape_position != MaxSector) { |
7771 | /* Check that we can continue the reshape. | |
b5254dd5 N |
7772 | * Difficulties arise if the stripe we would write to |
7773 | * next is at or after the stripe we would read from next. | |
7774 | * For a reshape that changes the number of devices, this | |
7775 | * is only possible for a very short time, and mdadm makes | |
7776 | * sure that time appears to have past before assembling | |
7777 | * the array. So we fail if that time hasn't passed. | |
7778 | * For a reshape that keeps the number of devices the same | |
7779 | * mdadm must be monitoring the reshape can keeping the | |
7780 | * critical areas read-only and backed up. It will start | |
7781 | * the array in read-only mode, so we check for that. | |
91adb564 N |
7782 | */ |
7783 | sector_t here_new, here_old; | |
7784 | int old_disks; | |
18b00334 | 7785 | int max_degraded = (mddev->level == 6 ? 2 : 1); |
05256d98 N |
7786 | int chunk_sectors; |
7787 | int new_data_disks; | |
91adb564 | 7788 | |
713cf5a6 | 7789 | if (journal_dev) { |
cc6167b4 N |
7790 | pr_warn("md/raid:%s: don't support reshape with journal - aborting.\n", |
7791 | mdname(mddev)); | |
0c031fd3 XN |
7792 | ret = -EINVAL; |
7793 | goto exit_acct_set; | |
713cf5a6 SL |
7794 | } |
7795 | ||
88ce4930 | 7796 | if (mddev->new_level != mddev->level) { |
cc6167b4 N |
7797 | pr_warn("md/raid:%s: unsupported reshape required - aborting.\n", |
7798 | mdname(mddev)); | |
0c031fd3 XN |
7799 | ret = -EINVAL; |
7800 | goto exit_acct_set; | |
91adb564 | 7801 | } |
91adb564 N |
7802 | old_disks = mddev->raid_disks - mddev->delta_disks; |
7803 | /* reshape_position must be on a new-stripe boundary, and one | |
7804 | * further up in new geometry must map after here in old | |
7805 | * geometry. | |
05256d98 N |
7806 | * If the chunk sizes are different, then as we perform reshape |
7807 | * in units of the largest of the two, reshape_position needs | |
7808 | * be a multiple of the largest chunk size times new data disks. | |
91adb564 N |
7809 | */ |
7810 | here_new = mddev->reshape_position; | |
05256d98 N |
7811 | chunk_sectors = max(mddev->chunk_sectors, mddev->new_chunk_sectors); |
7812 | new_data_disks = mddev->raid_disks - max_degraded; | |
7813 | if (sector_div(here_new, chunk_sectors * new_data_disks)) { | |
cc6167b4 N |
7814 | pr_warn("md/raid:%s: reshape_position not on a stripe boundary\n", |
7815 | mdname(mddev)); | |
0c031fd3 XN |
7816 | ret = -EINVAL; |
7817 | goto exit_acct_set; | |
91adb564 | 7818 | } |
05256d98 | 7819 | reshape_offset = here_new * chunk_sectors; |
91adb564 N |
7820 | /* here_new is the stripe we will write to */ |
7821 | here_old = mddev->reshape_position; | |
05256d98 | 7822 | sector_div(here_old, chunk_sectors * (old_disks-max_degraded)); |
91adb564 N |
7823 | /* here_old is the first stripe that we might need to read |
7824 | * from */ | |
67ac6011 N |
7825 | if (mddev->delta_disks == 0) { |
7826 | /* We cannot be sure it is safe to start an in-place | |
b5254dd5 | 7827 | * reshape. It is only safe if user-space is monitoring |
67ac6011 N |
7828 | * and taking constant backups. |
7829 | * mdadm always starts a situation like this in | |
7830 | * readonly mode so it can take control before | |
7831 | * allowing any writes. So just check for that. | |
7832 | */ | |
b5254dd5 N |
7833 | if (abs(min_offset_diff) >= mddev->chunk_sectors && |
7834 | abs(min_offset_diff) >= mddev->new_chunk_sectors) | |
7835 | /* not really in-place - so OK */; | |
7836 | else if (mddev->ro == 0) { | |
cc6167b4 N |
7837 | pr_warn("md/raid:%s: in-place reshape must be started in read-only mode - aborting\n", |
7838 | mdname(mddev)); | |
0c031fd3 XN |
7839 | ret = -EINVAL; |
7840 | goto exit_acct_set; | |
67ac6011 | 7841 | } |
2c810cdd | 7842 | } else if (mddev->reshape_backwards |
05256d98 N |
7843 | ? (here_new * chunk_sectors + min_offset_diff <= |
7844 | here_old * chunk_sectors) | |
7845 | : (here_new * chunk_sectors >= | |
7846 | here_old * chunk_sectors + (-min_offset_diff))) { | |
91adb564 | 7847 | /* Reading from the same stripe as writing to - bad */ |
cc6167b4 N |
7848 | pr_warn("md/raid:%s: reshape_position too early for auto-recovery - aborting.\n", |
7849 | mdname(mddev)); | |
0c031fd3 XN |
7850 | ret = -EINVAL; |
7851 | goto exit_acct_set; | |
91adb564 | 7852 | } |
cc6167b4 | 7853 | pr_debug("md/raid:%s: reshape will continue\n", mdname(mddev)); |
91adb564 N |
7854 | /* OK, we should be able to continue; */ |
7855 | } else { | |
7856 | BUG_ON(mddev->level != mddev->new_level); | |
7857 | BUG_ON(mddev->layout != mddev->new_layout); | |
664e7c41 | 7858 | BUG_ON(mddev->chunk_sectors != mddev->new_chunk_sectors); |
91adb564 | 7859 | BUG_ON(mddev->delta_disks != 0); |
1da177e4 | 7860 | } |
91adb564 | 7861 | |
3418d036 AP |
7862 | if (test_bit(MD_HAS_JOURNAL, &mddev->flags) && |
7863 | test_bit(MD_HAS_PPL, &mddev->flags)) { | |
7864 | pr_warn("md/raid:%s: using journal device and PPL not allowed - disabling PPL\n", | |
7865 | mdname(mddev)); | |
7866 | clear_bit(MD_HAS_PPL, &mddev->flags); | |
ddc08823 | 7867 | clear_bit(MD_HAS_MULTIPLE_PPLS, &mddev->flags); |
3418d036 AP |
7868 | } |
7869 | ||
245f46c2 N |
7870 | if (mddev->private == NULL) |
7871 | conf = setup_conf(mddev); | |
7872 | else | |
7873 | conf = mddev->private; | |
7874 | ||
0c031fd3 XN |
7875 | if (IS_ERR(conf)) { |
7876 | ret = PTR_ERR(conf); | |
7877 | goto exit_acct_set; | |
7878 | } | |
91adb564 | 7879 | |
486b0f7b SL |
7880 | if (test_bit(MD_HAS_JOURNAL, &mddev->flags)) { |
7881 | if (!journal_dev) { | |
cc6167b4 N |
7882 | pr_warn("md/raid:%s: journal disk is missing, force array readonly\n", |
7883 | mdname(mddev)); | |
486b0f7b SL |
7884 | mddev->ro = 1; |
7885 | set_disk_ro(mddev->gendisk, 1); | |
7886 | } else if (mddev->recovery_cp == MaxSector) | |
7887 | set_bit(MD_JOURNAL_CLEAN, &mddev->flags); | |
7dde2ad3 SL |
7888 | } |
7889 | ||
b5254dd5 | 7890 | conf->min_offset_diff = min_offset_diff; |
91adb564 N |
7891 | mddev->thread = conf->thread; |
7892 | conf->thread = NULL; | |
7893 | mddev->private = conf; | |
7894 | ||
17045f52 N |
7895 | for (i = 0; i < conf->raid_disks && conf->previous_raid_disks; |
7896 | i++) { | |
9aeb7f99 | 7897 | rdev = rdev_mdlock_deref(mddev, conf->disks[i].rdev); |
17045f52 N |
7898 | if (!rdev && conf->disks[i].replacement) { |
7899 | /* The replacement is all we have yet */ | |
9aeb7f99 LG |
7900 | rdev = rdev_mdlock_deref(mddev, |
7901 | conf->disks[i].replacement); | |
17045f52 N |
7902 | conf->disks[i].replacement = NULL; |
7903 | clear_bit(Replacement, &rdev->flags); | |
b0920ede | 7904 | rcu_assign_pointer(conf->disks[i].rdev, rdev); |
17045f52 N |
7905 | } |
7906 | if (!rdev) | |
c148ffdc | 7907 | continue; |
b0920ede | 7908 | if (rcu_access_pointer(conf->disks[i].replacement) && |
17045f52 N |
7909 | conf->reshape_progress != MaxSector) { |
7910 | /* replacements and reshape simply do not mix. */ | |
cc6167b4 | 7911 | pr_warn("md: cannot handle concurrent replacement and reshape.\n"); |
17045f52 N |
7912 | goto abort; |
7913 | } | |
7bc43612 | 7914 | if (test_bit(In_sync, &rdev->flags)) |
2f115882 | 7915 | continue; |
c148ffdc N |
7916 | /* This disc is not fully in-sync. However if it |
7917 | * just stored parity (beyond the recovery_offset), | |
7918 | * when we don't need to be concerned about the | |
7919 | * array being dirty. | |
7920 | * When reshape goes 'backwards', we never have | |
7921 | * partially completed devices, so we only need | |
7922 | * to worry about reshape going forwards. | |
7923 | */ | |
7924 | /* Hack because v0.91 doesn't store recovery_offset properly. */ | |
7925 | if (mddev->major_version == 0 && | |
7926 | mddev->minor_version > 90) | |
7927 | rdev->recovery_offset = reshape_offset; | |
5026d7a9 | 7928 | |
c148ffdc N |
7929 | if (rdev->recovery_offset < reshape_offset) { |
7930 | /* We need to check old and new layout */ | |
7931 | if (!only_parity(rdev->raid_disk, | |
7932 | conf->algorithm, | |
7933 | conf->raid_disks, | |
7934 | conf->max_degraded)) | |
7935 | continue; | |
7936 | } | |
7937 | if (!only_parity(rdev->raid_disk, | |
7938 | conf->prev_algo, | |
7939 | conf->previous_raid_disks, | |
7940 | conf->max_degraded)) | |
7941 | continue; | |
7942 | dirty_parity_disks++; | |
7943 | } | |
91adb564 | 7944 | |
17045f52 N |
7945 | /* |
7946 | * 0 for a fully functional array, 1 or 2 for a degraded array. | |
7947 | */ | |
2e38a37f | 7948 | mddev->degraded = raid5_calc_degraded(conf); |
91adb564 | 7949 | |
674806d6 | 7950 | if (has_failed(conf)) { |
cc6167b4 | 7951 | pr_crit("md/raid:%s: not enough operational devices (%d/%d failed)\n", |
02c2de8c | 7952 | mdname(mddev), mddev->degraded, conf->raid_disks); |
1da177e4 LT |
7953 | goto abort; |
7954 | } | |
7955 | ||
91adb564 | 7956 | /* device size must be a multiple of chunk size */ |
c5eec74f | 7957 | mddev->dev_sectors &= ~((sector_t)mddev->chunk_sectors - 1); |
91adb564 N |
7958 | mddev->resync_max_sectors = mddev->dev_sectors; |
7959 | ||
c148ffdc | 7960 | if (mddev->degraded > dirty_parity_disks && |
1da177e4 | 7961 | mddev->recovery_cp != MaxSector) { |
4536bf9b AP |
7962 | if (test_bit(MD_HAS_PPL, &mddev->flags)) |
7963 | pr_crit("md/raid:%s: starting dirty degraded array with PPL.\n", | |
7964 | mdname(mddev)); | |
7965 | else if (mddev->ok_start_degraded) | |
cc6167b4 N |
7966 | pr_crit("md/raid:%s: starting dirty degraded array - data corruption possible.\n", |
7967 | mdname(mddev)); | |
6ff8d8ec | 7968 | else { |
cc6167b4 N |
7969 | pr_crit("md/raid:%s: cannot start dirty degraded array.\n", |
7970 | mdname(mddev)); | |
6ff8d8ec N |
7971 | goto abort; |
7972 | } | |
1da177e4 LT |
7973 | } |
7974 | ||
cc6167b4 N |
7975 | pr_info("md/raid:%s: raid level %d active with %d out of %d devices, algorithm %d\n", |
7976 | mdname(mddev), conf->level, | |
7977 | mddev->raid_disks-mddev->degraded, mddev->raid_disks, | |
7978 | mddev->new_layout); | |
1da177e4 LT |
7979 | |
7980 | print_raid5_conf(conf); | |
7981 | ||
fef9c61f | 7982 | if (conf->reshape_progress != MaxSector) { |
fef9c61f | 7983 | conf->reshape_safe = conf->reshape_progress; |
f6705578 N |
7984 | atomic_set(&conf->reshape_stripes, 0); |
7985 | clear_bit(MD_RECOVERY_SYNC, &mddev->recovery); | |
7986 | clear_bit(MD_RECOVERY_CHECK, &mddev->recovery); | |
7987 | set_bit(MD_RECOVERY_RESHAPE, &mddev->recovery); | |
7988 | set_bit(MD_RECOVERY_RUNNING, &mddev->recovery); | |
7989 | mddev->sync_thread = md_register_thread(md_do_sync, mddev, | |
0da3c619 | 7990 | "reshape"); |
e406f12d AP |
7991 | if (!mddev->sync_thread) |
7992 | goto abort; | |
f6705578 N |
7993 | } |
7994 | ||
1da177e4 | 7995 | /* Ok, everything is just fine now */ |
a64c876f N |
7996 | if (mddev->to_remove == &raid5_attrs_group) |
7997 | mddev->to_remove = NULL; | |
00bcb4ac N |
7998 | else if (mddev->kobj.sd && |
7999 | sysfs_create_group(&mddev->kobj, &raid5_attrs_group)) | |
cc6167b4 N |
8000 | pr_warn("raid5: failed to create sysfs attributes for %s\n", |
8001 | mdname(mddev)); | |
4a5add49 | 8002 | md_set_array_sectors(mddev, raid5_size(mddev, 0, 0)); |
7a5febe9 | 8003 | |
4a5add49 | 8004 | if (mddev->queue) { |
9f7c2220 | 8005 | int chunk_size; |
4a5add49 N |
8006 | /* read-ahead size must cover two whole stripes, which |
8007 | * is 2 * (datadisks) * chunksize where 'n' is the | |
8008 | * number of raid devices | |
8009 | */ | |
8010 | int data_disks = conf->previous_raid_disks - conf->max_degraded; | |
8011 | int stripe = data_disks * | |
8012 | ((mddev->chunk_sectors << 9) / PAGE_SIZE); | |
91adb564 | 8013 | |
9f7c2220 N |
8014 | chunk_size = mddev->chunk_sectors << 9; |
8015 | blk_queue_io_min(mddev->queue, chunk_size); | |
16ef5101 | 8016 | raid5_set_io_opt(conf); |
c78afc62 | 8017 | mddev->queue->limits.raid_partial_stripes_expensive = 1; |
620125f2 SL |
8018 | /* |
8019 | * We can only discard a whole stripe. It doesn't make sense to | |
8020 | * discard data disk but write parity disk | |
8021 | */ | |
8022 | stripe = stripe * PAGE_SIZE; | |
c6efe434 | 8023 | stripe = roundup_pow_of_two(stripe); |
620125f2 | 8024 | mddev->queue->limits.discard_granularity = stripe; |
e8d7c332 | 8025 | |
3deff1a7 | 8026 | blk_queue_max_write_zeroes_sectors(mddev->queue, 0); |
5026d7a9 | 8027 | |
05616be5 | 8028 | rdev_for_each(rdev, mddev) { |
9f7c2220 N |
8029 | disk_stack_limits(mddev->gendisk, rdev->bdev, |
8030 | rdev->data_offset << 9); | |
05616be5 N |
8031 | disk_stack_limits(mddev->gendisk, rdev->bdev, |
8032 | rdev->new_data_offset << 9); | |
8033 | } | |
620125f2 | 8034 | |
48920ff2 CH |
8035 | /* |
8036 | * zeroing is required, otherwise data | |
8037 | * could be lost. Consider a scenario: discard a stripe | |
8038 | * (the stripe could be inconsistent if | |
8039 | * discard_zeroes_data is 0); write one disk of the | |
8040 | * stripe (the stripe could be inconsistent again | |
8041 | * depending on which disks are used to calculate | |
8042 | * parity); the disk is broken; The stripe data of this | |
8043 | * disk is lost. | |
8044 | * | |
8045 | * We only allow DISCARD if the sysadmin has confirmed that | |
8046 | * only safe devices are in use by setting a module parameter. | |
8047 | * A better idea might be to turn DISCARD into WRITE_ZEROES | |
8048 | * requests, as that is required to be safe. | |
8049 | */ | |
70200574 CH |
8050 | if (!devices_handle_discard_safely || |
8051 | mddev->queue->limits.max_discard_sectors < (stripe >> 9) || | |
8052 | mddev->queue->limits.discard_granularity < stripe) | |
8053 | blk_queue_max_discard_sectors(mddev->queue, 0); | |
1dffdddd | 8054 | |
7e55c60a LG |
8055 | /* |
8056 | * Requests require having a bitmap for each stripe. | |
8057 | * Limit the max sectors based on this. | |
8058 | */ | |
8059 | blk_queue_max_hw_sectors(mddev->queue, | |
8060 | RAID5_MAX_REQ_STRIPES << RAID5_STRIPE_SHIFT(conf)); | |
9ad1a74f LG |
8061 | |
8062 | /* No restrictions on the number of segments in the request */ | |
8063 | blk_queue_max_segments(mddev->queue, USHRT_MAX); | |
9f7c2220 | 8064 | } |
23032a0e | 8065 | |
845b9e22 | 8066 | if (log_init(conf, journal_dev, raid5_has_ppl(conf))) |
ff875738 | 8067 | goto abort; |
5c7e81c3 | 8068 | |
1da177e4 LT |
8069 | return 0; |
8070 | abort: | |
01f96c0a | 8071 | md_unregister_thread(&mddev->thread); |
e4f869d9 N |
8072 | print_raid5_conf(conf); |
8073 | free_conf(conf); | |
1da177e4 | 8074 | mddev->private = NULL; |
cc6167b4 | 8075 | pr_warn("md/raid:%s: failed to run raid set.\n", mdname(mddev)); |
0c031fd3 XN |
8076 | ret = -EIO; |
8077 | exit_acct_set: | |
8078 | acct_bioset_exit(mddev); | |
8079 | return ret; | |
1da177e4 LT |
8080 | } |
8081 | ||
afa0f557 | 8082 | static void raid5_free(struct mddev *mddev, void *priv) |
1da177e4 | 8083 | { |
afa0f557 | 8084 | struct r5conf *conf = priv; |
1da177e4 | 8085 | |
95fc17aa | 8086 | free_conf(conf); |
0c031fd3 | 8087 | acct_bioset_exit(mddev); |
a64c876f | 8088 | mddev->to_remove = &raid5_attrs_group; |
1da177e4 LT |
8089 | } |
8090 | ||
849674e4 | 8091 | static void raid5_status(struct seq_file *seq, struct mddev *mddev) |
1da177e4 | 8092 | { |
d1688a6d | 8093 | struct r5conf *conf = mddev->private; |
1da177e4 LT |
8094 | int i; |
8095 | ||
9d8f0363 | 8096 | seq_printf(seq, " level %d, %dk chunk, algorithm %d", mddev->level, |
3cb5edf4 | 8097 | conf->chunk_sectors / 2, mddev->layout); |
02c2de8c | 8098 | seq_printf (seq, " [%d/%d] [", conf->raid_disks, conf->raid_disks - mddev->degraded); |
5fd13351 N |
8099 | rcu_read_lock(); |
8100 | for (i = 0; i < conf->raid_disks; i++) { | |
8101 | struct md_rdev *rdev = rcu_dereference(conf->disks[i].rdev); | |
8102 | seq_printf (seq, "%s", rdev && test_bit(In_sync, &rdev->flags) ? "U" : "_"); | |
8103 | } | |
8104 | rcu_read_unlock(); | |
1da177e4 | 8105 | seq_printf (seq, "]"); |
1da177e4 LT |
8106 | } |
8107 | ||
d1688a6d | 8108 | static void print_raid5_conf (struct r5conf *conf) |
1da177e4 | 8109 | { |
b0920ede | 8110 | struct md_rdev *rdev; |
1da177e4 | 8111 | int i; |
1da177e4 | 8112 | |
cc6167b4 | 8113 | pr_debug("RAID conf printout:\n"); |
1da177e4 | 8114 | if (!conf) { |
cc6167b4 | 8115 | pr_debug("(conf==NULL)\n"); |
1da177e4 LT |
8116 | return; |
8117 | } | |
cc6167b4 | 8118 | pr_debug(" --- level:%d rd:%d wd:%d\n", conf->level, |
0c55e022 N |
8119 | conf->raid_disks, |
8120 | conf->raid_disks - conf->mddev->degraded); | |
1da177e4 | 8121 | |
b0920ede | 8122 | rcu_read_lock(); |
1da177e4 | 8123 | for (i = 0; i < conf->raid_disks; i++) { |
b0920ede LG |
8124 | rdev = rcu_dereference(conf->disks[i].rdev); |
8125 | if (rdev) | |
913cce5a | 8126 | pr_debug(" disk %d, o:%d, dev:%pg\n", |
b0920ede | 8127 | i, !test_bit(Faulty, &rdev->flags), |
913cce5a | 8128 | rdev->bdev); |
1da177e4 | 8129 | } |
b0920ede | 8130 | rcu_read_unlock(); |
1da177e4 LT |
8131 | } |
8132 | ||
fd01b88c | 8133 | static int raid5_spare_active(struct mddev *mddev) |
1da177e4 LT |
8134 | { |
8135 | int i; | |
d1688a6d | 8136 | struct r5conf *conf = mddev->private; |
9aeb7f99 | 8137 | struct md_rdev *rdev, *replacement; |
6b965620 N |
8138 | int count = 0; |
8139 | unsigned long flags; | |
1da177e4 LT |
8140 | |
8141 | for (i = 0; i < conf->raid_disks; i++) { | |
9aeb7f99 LG |
8142 | rdev = rdev_mdlock_deref(mddev, conf->disks[i].rdev); |
8143 | replacement = rdev_mdlock_deref(mddev, | |
8144 | conf->disks[i].replacement); | |
8145 | if (replacement | |
8146 | && replacement->recovery_offset == MaxSector | |
8147 | && !test_bit(Faulty, &replacement->flags) | |
8148 | && !test_and_set_bit(In_sync, &replacement->flags)) { | |
dd054fce | 8149 | /* Replacement has just become active. */ |
9aeb7f99 LG |
8150 | if (!rdev |
8151 | || !test_and_clear_bit(In_sync, &rdev->flags)) | |
dd054fce | 8152 | count++; |
9aeb7f99 | 8153 | if (rdev) { |
dd054fce N |
8154 | /* Replaced device not technically faulty, |
8155 | * but we need to be sure it gets removed | |
8156 | * and never re-added. | |
8157 | */ | |
9aeb7f99 | 8158 | set_bit(Faulty, &rdev->flags); |
dd054fce | 8159 | sysfs_notify_dirent_safe( |
9aeb7f99 | 8160 | rdev->sysfs_state); |
dd054fce | 8161 | } |
9aeb7f99 LG |
8162 | sysfs_notify_dirent_safe(replacement->sysfs_state); |
8163 | } else if (rdev | |
8164 | && rdev->recovery_offset == MaxSector | |
8165 | && !test_bit(Faulty, &rdev->flags) | |
8166 | && !test_and_set_bit(In_sync, &rdev->flags)) { | |
6b965620 | 8167 | count++; |
9aeb7f99 | 8168 | sysfs_notify_dirent_safe(rdev->sysfs_state); |
1da177e4 LT |
8169 | } |
8170 | } | |
6b965620 | 8171 | spin_lock_irqsave(&conf->device_lock, flags); |
2e38a37f | 8172 | mddev->degraded = raid5_calc_degraded(conf); |
6b965620 | 8173 | spin_unlock_irqrestore(&conf->device_lock, flags); |
1da177e4 | 8174 | print_raid5_conf(conf); |
6b965620 | 8175 | return count; |
1da177e4 LT |
8176 | } |
8177 | ||
b8321b68 | 8178 | static int raid5_remove_disk(struct mddev *mddev, struct md_rdev *rdev) |
1da177e4 | 8179 | { |
d1688a6d | 8180 | struct r5conf *conf = mddev->private; |
1da177e4 | 8181 | int err = 0; |
b8321b68 | 8182 | int number = rdev->raid_disk; |
b0920ede | 8183 | struct md_rdev __rcu **rdevp; |
1ebc2cec | 8184 | struct disk_info *p; |
b0920ede | 8185 | struct md_rdev *tmp; |
1da177e4 LT |
8186 | |
8187 | print_raid5_conf(conf); | |
f6b6ec5c | 8188 | if (test_bit(Journal, &rdev->flags) && conf->log) { |
c2bb6242 | 8189 | /* |
f6b6ec5c SL |
8190 | * we can't wait pending write here, as this is called in |
8191 | * raid5d, wait will deadlock. | |
84dd97a6 N |
8192 | * neilb: there is no locking about new writes here, |
8193 | * so this cannot be safe. | |
c2bb6242 | 8194 | */ |
70d466f7 SL |
8195 | if (atomic_read(&conf->active_stripes) || |
8196 | atomic_read(&conf->r5c_cached_full_stripes) || | |
8197 | atomic_read(&conf->r5c_cached_partial_stripes)) { | |
f6b6ec5c | 8198 | return -EBUSY; |
84dd97a6 | 8199 | } |
ff875738 | 8200 | log_exit(conf); |
f6b6ec5c | 8201 | return 0; |
c2bb6242 | 8202 | } |
1ebc2cec MP |
8203 | if (unlikely(number >= conf->pool_size)) |
8204 | return 0; | |
8205 | p = conf->disks + number; | |
b0920ede | 8206 | if (rdev == rcu_access_pointer(p->rdev)) |
657e3e4d | 8207 | rdevp = &p->rdev; |
b0920ede | 8208 | else if (rdev == rcu_access_pointer(p->replacement)) |
657e3e4d N |
8209 | rdevp = &p->replacement; |
8210 | else | |
8211 | return 0; | |
8212 | ||
8213 | if (number >= conf->raid_disks && | |
8214 | conf->reshape_progress == MaxSector) | |
8215 | clear_bit(In_sync, &rdev->flags); | |
8216 | ||
8217 | if (test_bit(In_sync, &rdev->flags) || | |
8218 | atomic_read(&rdev->nr_pending)) { | |
8219 | err = -EBUSY; | |
8220 | goto abort; | |
8221 | } | |
8222 | /* Only remove non-faulty devices if recovery | |
8223 | * isn't possible. | |
8224 | */ | |
8225 | if (!test_bit(Faulty, &rdev->flags) && | |
8226 | mddev->recovery_disabled != conf->recovery_disabled && | |
8227 | !has_failed(conf) && | |
b0920ede LG |
8228 | (!rcu_access_pointer(p->replacement) || |
8229 | rcu_access_pointer(p->replacement) == rdev) && | |
657e3e4d N |
8230 | number < conf->raid_disks) { |
8231 | err = -EBUSY; | |
8232 | goto abort; | |
8233 | } | |
8234 | *rdevp = NULL; | |
d787be40 | 8235 | if (!test_bit(RemoveSynchronized, &rdev->flags)) { |
9aeb7f99 | 8236 | lockdep_assert_held(&mddev->reconfig_mutex); |
d787be40 N |
8237 | synchronize_rcu(); |
8238 | if (atomic_read(&rdev->nr_pending)) { | |
8239 | /* lost the race, try later */ | |
8240 | err = -EBUSY; | |
b0920ede | 8241 | rcu_assign_pointer(*rdevp, rdev); |
d787be40 N |
8242 | } |
8243 | } | |
6358c239 AP |
8244 | if (!err) { |
8245 | err = log_modify(conf, rdev, false); | |
8246 | if (err) | |
8247 | goto abort; | |
8248 | } | |
b0920ede LG |
8249 | |
8250 | tmp = rcu_access_pointer(p->replacement); | |
8251 | if (tmp) { | |
dd054fce | 8252 | /* We must have just cleared 'rdev' */ |
b0920ede LG |
8253 | rcu_assign_pointer(p->rdev, tmp); |
8254 | clear_bit(Replacement, &tmp->flags); | |
dd054fce N |
8255 | smp_mb(); /* Make sure other CPUs may see both as identical |
8256 | * but will never see neither - if they are careful | |
8257 | */ | |
b0920ede | 8258 | rcu_assign_pointer(p->replacement, NULL); |
6358c239 AP |
8259 | |
8260 | if (!err) | |
b0920ede | 8261 | err = log_modify(conf, tmp, true); |
e5bc9c3c GJ |
8262 | } |
8263 | ||
8264 | clear_bit(WantReplacement, &rdev->flags); | |
1da177e4 LT |
8265 | abort: |
8266 | ||
8267 | print_raid5_conf(conf); | |
8268 | return err; | |
8269 | } | |
8270 | ||
fd01b88c | 8271 | static int raid5_add_disk(struct mddev *mddev, struct md_rdev *rdev) |
1da177e4 | 8272 | { |
d1688a6d | 8273 | struct r5conf *conf = mddev->private; |
d9771f5e | 8274 | int ret, err = -EEXIST; |
1da177e4 LT |
8275 | int disk; |
8276 | struct disk_info *p; | |
9aeb7f99 | 8277 | struct md_rdev *tmp; |
6c2fce2e NB |
8278 | int first = 0; |
8279 | int last = conf->raid_disks - 1; | |
1da177e4 | 8280 | |
f6b6ec5c | 8281 | if (test_bit(Journal, &rdev->flags)) { |
f6b6ec5c SL |
8282 | if (conf->log) |
8283 | return -EBUSY; | |
8284 | ||
8285 | rdev->raid_disk = 0; | |
8286 | /* | |
8287 | * The array is in readonly mode if journal is missing, so no | |
8288 | * write requests running. We should be safe | |
8289 | */ | |
d9771f5e XN |
8290 | ret = log_init(conf, rdev, false); |
8291 | if (ret) | |
8292 | return ret; | |
8293 | ||
8294 | ret = r5l_start(conf->log); | |
8295 | if (ret) | |
8296 | return ret; | |
8297 | ||
f6b6ec5c SL |
8298 | return 0; |
8299 | } | |
7f0da59b N |
8300 | if (mddev->recovery_disabled == conf->recovery_disabled) |
8301 | return -EBUSY; | |
8302 | ||
dc10c643 | 8303 | if (rdev->saved_raid_disk < 0 && has_failed(conf)) |
1da177e4 | 8304 | /* no point adding a device */ |
199050ea | 8305 | return -EINVAL; |
1da177e4 | 8306 | |
6c2fce2e NB |
8307 | if (rdev->raid_disk >= 0) |
8308 | first = last = rdev->raid_disk; | |
1da177e4 LT |
8309 | |
8310 | /* | |
16a53ecc N |
8311 | * find the disk ... but prefer rdev->saved_raid_disk |
8312 | * if possible. | |
1da177e4 | 8313 | */ |
a20d636b | 8314 | if (rdev->saved_raid_disk >= first && |
617b3658 | 8315 | rdev->saved_raid_disk <= last && |
16a53ecc | 8316 | conf->disks[rdev->saved_raid_disk].rdev == NULL) |
5cfb22a1 N |
8317 | first = rdev->saved_raid_disk; |
8318 | ||
8319 | for (disk = first; disk <= last; disk++) { | |
7bfec5f3 N |
8320 | p = conf->disks + disk; |
8321 | if (p->rdev == NULL) { | |
b2d444d7 | 8322 | clear_bit(In_sync, &rdev->flags); |
1da177e4 | 8323 | rdev->raid_disk = disk; |
72626685 N |
8324 | if (rdev->saved_raid_disk != disk) |
8325 | conf->fullsync = 1; | |
d6065f7b | 8326 | rcu_assign_pointer(p->rdev, rdev); |
6358c239 AP |
8327 | |
8328 | err = log_modify(conf, rdev, true); | |
8329 | ||
5cfb22a1 | 8330 | goto out; |
1da177e4 | 8331 | } |
5cfb22a1 N |
8332 | } |
8333 | for (disk = first; disk <= last; disk++) { | |
8334 | p = conf->disks + disk; | |
9aeb7f99 LG |
8335 | tmp = rdev_mdlock_deref(mddev, p->rdev); |
8336 | if (test_bit(WantReplacement, &tmp->flags) && | |
7bfec5f3 N |
8337 | p->replacement == NULL) { |
8338 | clear_bit(In_sync, &rdev->flags); | |
8339 | set_bit(Replacement, &rdev->flags); | |
8340 | rdev->raid_disk = disk; | |
8341 | err = 0; | |
8342 | conf->fullsync = 1; | |
8343 | rcu_assign_pointer(p->replacement, rdev); | |
8344 | break; | |
8345 | } | |
8346 | } | |
5cfb22a1 | 8347 | out: |
1da177e4 | 8348 | print_raid5_conf(conf); |
199050ea | 8349 | return err; |
1da177e4 LT |
8350 | } |
8351 | ||
fd01b88c | 8352 | static int raid5_resize(struct mddev *mddev, sector_t sectors) |
1da177e4 LT |
8353 | { |
8354 | /* no resync is happening, and there is enough space | |
8355 | * on all devices, so we can resize. | |
8356 | * We need to make sure resync covers any new space. | |
8357 | * If the array is shrinking we should possibly wait until | |
8358 | * any io in the removed space completes, but it hardly seems | |
8359 | * worth it. | |
8360 | */ | |
a4a6125a | 8361 | sector_t newsize; |
3cb5edf4 N |
8362 | struct r5conf *conf = mddev->private; |
8363 | ||
e254de6b | 8364 | if (raid5_has_log(conf) || raid5_has_ppl(conf)) |
713cf5a6 | 8365 | return -EINVAL; |
3cb5edf4 | 8366 | sectors &= ~((sector_t)conf->chunk_sectors - 1); |
a4a6125a N |
8367 | newsize = raid5_size(mddev, sectors, mddev->raid_disks); |
8368 | if (mddev->external_size && | |
8369 | mddev->array_sectors > newsize) | |
b522adcd | 8370 | return -EINVAL; |
a4a6125a | 8371 | if (mddev->bitmap) { |
e64e4018 | 8372 | int ret = md_bitmap_resize(mddev->bitmap, sectors, 0, 0); |
a4a6125a N |
8373 | if (ret) |
8374 | return ret; | |
8375 | } | |
8376 | md_set_array_sectors(mddev, newsize); | |
b098636c N |
8377 | if (sectors > mddev->dev_sectors && |
8378 | mddev->recovery_cp > mddev->dev_sectors) { | |
58c0fed4 | 8379 | mddev->recovery_cp = mddev->dev_sectors; |
1da177e4 LT |
8380 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
8381 | } | |
58c0fed4 | 8382 | mddev->dev_sectors = sectors; |
4b5c7ae8 | 8383 | mddev->resync_max_sectors = sectors; |
1da177e4 LT |
8384 | return 0; |
8385 | } | |
8386 | ||
fd01b88c | 8387 | static int check_stripe_cache(struct mddev *mddev) |
01ee22b4 N |
8388 | { |
8389 | /* Can only proceed if there are plenty of stripe_heads. | |
8390 | * We need a minimum of one full stripe,, and for sensible progress | |
8391 | * it is best to have about 4 times that. | |
8392 | * If we require 4 times, then the default 256 4K stripe_heads will | |
8393 | * allow for chunk sizes up to 256K, which is probably OK. | |
8394 | * If the chunk size is greater, user-space should request more | |
8395 | * stripe_heads first. | |
8396 | */ | |
d1688a6d | 8397 | struct r5conf *conf = mddev->private; |
c911c46c | 8398 | if (((mddev->chunk_sectors << 9) / RAID5_STRIPE_SIZE(conf)) * 4 |
edbe83ab | 8399 | > conf->min_nr_stripes || |
c911c46c | 8400 | ((mddev->new_chunk_sectors << 9) / RAID5_STRIPE_SIZE(conf)) * 4 |
edbe83ab | 8401 | > conf->min_nr_stripes) { |
cc6167b4 N |
8402 | pr_warn("md/raid:%s: reshape: not enough stripes. Needed %lu\n", |
8403 | mdname(mddev), | |
8404 | ((max(mddev->chunk_sectors, mddev->new_chunk_sectors) << 9) | |
c911c46c | 8405 | / RAID5_STRIPE_SIZE(conf))*4); |
01ee22b4 N |
8406 | return 0; |
8407 | } | |
8408 | return 1; | |
8409 | } | |
8410 | ||
fd01b88c | 8411 | static int check_reshape(struct mddev *mddev) |
29269553 | 8412 | { |
d1688a6d | 8413 | struct r5conf *conf = mddev->private; |
29269553 | 8414 | |
e254de6b | 8415 | if (raid5_has_log(conf) || raid5_has_ppl(conf)) |
713cf5a6 | 8416 | return -EINVAL; |
88ce4930 N |
8417 | if (mddev->delta_disks == 0 && |
8418 | mddev->new_layout == mddev->layout && | |
664e7c41 | 8419 | mddev->new_chunk_sectors == mddev->chunk_sectors) |
50ac168a | 8420 | return 0; /* nothing to do */ |
674806d6 | 8421 | if (has_failed(conf)) |
ec32a2bd | 8422 | return -EINVAL; |
fdcfbbb6 | 8423 | if (mddev->delta_disks < 0 && mddev->reshape_position == MaxSector) { |
ec32a2bd N |
8424 | /* We might be able to shrink, but the devices must |
8425 | * be made bigger first. | |
8426 | * For raid6, 4 is the minimum size. | |
8427 | * Otherwise 2 is the minimum | |
8428 | */ | |
8429 | int min = 2; | |
8430 | if (mddev->level == 6) | |
8431 | min = 4; | |
8432 | if (mddev->raid_disks + mddev->delta_disks < min) | |
8433 | return -EINVAL; | |
8434 | } | |
29269553 | 8435 | |
01ee22b4 | 8436 | if (!check_stripe_cache(mddev)) |
29269553 | 8437 | return -ENOSPC; |
29269553 | 8438 | |
738a2738 N |
8439 | if (mddev->new_chunk_sectors > mddev->chunk_sectors || |
8440 | mddev->delta_disks > 0) | |
8441 | if (resize_chunks(conf, | |
8442 | conf->previous_raid_disks | |
8443 | + max(0, mddev->delta_disks), | |
8444 | max(mddev->new_chunk_sectors, | |
8445 | mddev->chunk_sectors) | |
8446 | ) < 0) | |
8447 | return -ENOMEM; | |
845b9e22 AP |
8448 | |
8449 | if (conf->previous_raid_disks + mddev->delta_disks <= conf->pool_size) | |
8450 | return 0; /* never bother to shrink */ | |
e56108d6 N |
8451 | return resize_stripes(conf, (conf->previous_raid_disks |
8452 | + mddev->delta_disks)); | |
63c70c4f N |
8453 | } |
8454 | ||
fd01b88c | 8455 | static int raid5_start_reshape(struct mddev *mddev) |
63c70c4f | 8456 | { |
d1688a6d | 8457 | struct r5conf *conf = mddev->private; |
3cb03002 | 8458 | struct md_rdev *rdev; |
63c70c4f | 8459 | int spares = 0; |
c04be0aa | 8460 | unsigned long flags; |
63c70c4f | 8461 | |
f416885e | 8462 | if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) |
63c70c4f N |
8463 | return -EBUSY; |
8464 | ||
01ee22b4 N |
8465 | if (!check_stripe_cache(mddev)) |
8466 | return -ENOSPC; | |
8467 | ||
30b67645 N |
8468 | if (has_failed(conf)) |
8469 | return -EINVAL; | |
8470 | ||
c6563a8c | 8471 | rdev_for_each(rdev, mddev) { |
469518a3 N |
8472 | if (!test_bit(In_sync, &rdev->flags) |
8473 | && !test_bit(Faulty, &rdev->flags)) | |
29269553 | 8474 | spares++; |
c6563a8c | 8475 | } |
63c70c4f | 8476 | |
f416885e | 8477 | if (spares - mddev->degraded < mddev->delta_disks - conf->max_degraded) |
29269553 N |
8478 | /* Not enough devices even to make a degraded array |
8479 | * of that size | |
8480 | */ | |
8481 | return -EINVAL; | |
8482 | ||
ec32a2bd N |
8483 | /* Refuse to reduce size of the array. Any reductions in |
8484 | * array size must be through explicit setting of array_size | |
8485 | * attribute. | |
8486 | */ | |
8487 | if (raid5_size(mddev, 0, conf->raid_disks + mddev->delta_disks) | |
8488 | < mddev->array_sectors) { | |
cc6167b4 N |
8489 | pr_warn("md/raid:%s: array size must be reduced before number of disks\n", |
8490 | mdname(mddev)); | |
ec32a2bd N |
8491 | return -EINVAL; |
8492 | } | |
8493 | ||
f6705578 | 8494 | atomic_set(&conf->reshape_stripes, 0); |
29269553 | 8495 | spin_lock_irq(&conf->device_lock); |
c46501b2 | 8496 | write_seqcount_begin(&conf->gen_lock); |
29269553 | 8497 | conf->previous_raid_disks = conf->raid_disks; |
63c70c4f | 8498 | conf->raid_disks += mddev->delta_disks; |
09c9e5fa AN |
8499 | conf->prev_chunk_sectors = conf->chunk_sectors; |
8500 | conf->chunk_sectors = mddev->new_chunk_sectors; | |
88ce4930 N |
8501 | conf->prev_algo = conf->algorithm; |
8502 | conf->algorithm = mddev->new_layout; | |
05616be5 N |
8503 | conf->generation++; |
8504 | /* Code that selects data_offset needs to see the generation update | |
8505 | * if reshape_progress has been set - so a memory barrier needed. | |
8506 | */ | |
8507 | smp_mb(); | |
2c810cdd | 8508 | if (mddev->reshape_backwards) |
fef9c61f N |
8509 | conf->reshape_progress = raid5_size(mddev, 0, 0); |
8510 | else | |
8511 | conf->reshape_progress = 0; | |
8512 | conf->reshape_safe = conf->reshape_progress; | |
c46501b2 | 8513 | write_seqcount_end(&conf->gen_lock); |
29269553 N |
8514 | spin_unlock_irq(&conf->device_lock); |
8515 | ||
4d77e3ba N |
8516 | /* Now make sure any requests that proceeded on the assumption |
8517 | * the reshape wasn't running - like Discard or Read - have | |
8518 | * completed. | |
8519 | */ | |
8520 | mddev_suspend(mddev); | |
8521 | mddev_resume(mddev); | |
8522 | ||
29269553 N |
8523 | /* Add some new drives, as many as will fit. |
8524 | * We know there are enough to make the newly sized array work. | |
3424bf6a N |
8525 | * Don't add devices if we are reducing the number of |
8526 | * devices in the array. This is because it is not possible | |
8527 | * to correctly record the "partially reconstructed" state of | |
8528 | * such devices during the reshape and confusion could result. | |
29269553 | 8529 | */ |
87a8dec9 | 8530 | if (mddev->delta_disks >= 0) { |
dafb20fa | 8531 | rdev_for_each(rdev, mddev) |
87a8dec9 N |
8532 | if (rdev->raid_disk < 0 && |
8533 | !test_bit(Faulty, &rdev->flags)) { | |
8534 | if (raid5_add_disk(mddev, rdev) == 0) { | |
87a8dec9 | 8535 | if (rdev->raid_disk |
9d4c7d87 | 8536 | >= conf->previous_raid_disks) |
87a8dec9 | 8537 | set_bit(In_sync, &rdev->flags); |
9d4c7d87 | 8538 | else |
87a8dec9 | 8539 | rdev->recovery_offset = 0; |
36fad858 | 8540 | |
2aada5b1 DLM |
8541 | /* Failure here is OK */ |
8542 | sysfs_link_rdev(mddev, rdev); | |
50da0840 | 8543 | } |
87a8dec9 N |
8544 | } else if (rdev->raid_disk >= conf->previous_raid_disks |
8545 | && !test_bit(Faulty, &rdev->flags)) { | |
8546 | /* This is a spare that was manually added */ | |
8547 | set_bit(In_sync, &rdev->flags); | |
87a8dec9 | 8548 | } |
29269553 | 8549 | |
87a8dec9 N |
8550 | /* When a reshape changes the number of devices, |
8551 | * ->degraded is measured against the larger of the | |
8552 | * pre and post number of devices. | |
8553 | */ | |
ec32a2bd | 8554 | spin_lock_irqsave(&conf->device_lock, flags); |
2e38a37f | 8555 | mddev->degraded = raid5_calc_degraded(conf); |
ec32a2bd N |
8556 | spin_unlock_irqrestore(&conf->device_lock, flags); |
8557 | } | |
63c70c4f | 8558 | mddev->raid_disks = conf->raid_disks; |
e516402c | 8559 | mddev->reshape_position = conf->reshape_progress; |
2953079c | 8560 | set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags); |
f6705578 | 8561 | |
29269553 N |
8562 | clear_bit(MD_RECOVERY_SYNC, &mddev->recovery); |
8563 | clear_bit(MD_RECOVERY_CHECK, &mddev->recovery); | |
ea358cd0 | 8564 | clear_bit(MD_RECOVERY_DONE, &mddev->recovery); |
29269553 N |
8565 | set_bit(MD_RECOVERY_RESHAPE, &mddev->recovery); |
8566 | set_bit(MD_RECOVERY_RUNNING, &mddev->recovery); | |
8567 | mddev->sync_thread = md_register_thread(md_do_sync, mddev, | |
0da3c619 | 8568 | "reshape"); |
29269553 N |
8569 | if (!mddev->sync_thread) { |
8570 | mddev->recovery = 0; | |
8571 | spin_lock_irq(&conf->device_lock); | |
ba8805b9 | 8572 | write_seqcount_begin(&conf->gen_lock); |
29269553 | 8573 | mddev->raid_disks = conf->raid_disks = conf->previous_raid_disks; |
ba8805b9 N |
8574 | mddev->new_chunk_sectors = |
8575 | conf->chunk_sectors = conf->prev_chunk_sectors; | |
8576 | mddev->new_layout = conf->algorithm = conf->prev_algo; | |
05616be5 N |
8577 | rdev_for_each(rdev, mddev) |
8578 | rdev->new_data_offset = rdev->data_offset; | |
8579 | smp_wmb(); | |
ba8805b9 | 8580 | conf->generation --; |
fef9c61f | 8581 | conf->reshape_progress = MaxSector; |
1e3fa9bd | 8582 | mddev->reshape_position = MaxSector; |
ba8805b9 | 8583 | write_seqcount_end(&conf->gen_lock); |
29269553 N |
8584 | spin_unlock_irq(&conf->device_lock); |
8585 | return -EAGAIN; | |
8586 | } | |
c8f517c4 | 8587 | conf->reshape_checkpoint = jiffies; |
29269553 | 8588 | md_wakeup_thread(mddev->sync_thread); |
54679486 | 8589 | md_new_event(); |
29269553 N |
8590 | return 0; |
8591 | } | |
29269553 | 8592 | |
ec32a2bd N |
8593 | /* This is called from the reshape thread and should make any |
8594 | * changes needed in 'conf' | |
8595 | */ | |
d1688a6d | 8596 | static void end_reshape(struct r5conf *conf) |
29269553 | 8597 | { |
29269553 | 8598 | |
f6705578 | 8599 | if (!test_bit(MD_RECOVERY_INTR, &conf->mddev->recovery)) { |
db0505d3 | 8600 | struct md_rdev *rdev; |
f6705578 | 8601 | |
f6705578 | 8602 | spin_lock_irq(&conf->device_lock); |
cea9c228 | 8603 | conf->previous_raid_disks = conf->raid_disks; |
b5d27718 | 8604 | md_finish_reshape(conf->mddev); |
05616be5 | 8605 | smp_wmb(); |
fef9c61f | 8606 | conf->reshape_progress = MaxSector; |
6cbd8148 | 8607 | conf->mddev->reshape_position = MaxSector; |
db0505d3 N |
8608 | rdev_for_each(rdev, conf->mddev) |
8609 | if (rdev->raid_disk >= 0 && | |
8610 | !test_bit(Journal, &rdev->flags) && | |
8611 | !test_bit(In_sync, &rdev->flags)) | |
8612 | rdev->recovery_offset = MaxSector; | |
f6705578 | 8613 | spin_unlock_irq(&conf->device_lock); |
b0f9ec04 | 8614 | wake_up(&conf->wait_for_overlap); |
16a53ecc | 8615 | |
c2e4cd57 | 8616 | if (conf->mddev->queue) |
16ef5101 | 8617 | raid5_set_io_opt(conf); |
29269553 | 8618 | } |
29269553 N |
8619 | } |
8620 | ||
ec32a2bd N |
8621 | /* This is called from the raid5d thread with mddev_lock held. |
8622 | * It makes config changes to the device. | |
8623 | */ | |
fd01b88c | 8624 | static void raid5_finish_reshape(struct mddev *mddev) |
cea9c228 | 8625 | { |
d1688a6d | 8626 | struct r5conf *conf = mddev->private; |
9aeb7f99 | 8627 | struct md_rdev *rdev; |
cea9c228 N |
8628 | |
8629 | if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery)) { | |
8630 | ||
8876391e | 8631 | if (mddev->delta_disks <= 0) { |
ec32a2bd | 8632 | int d; |
908f4fbd | 8633 | spin_lock_irq(&conf->device_lock); |
2e38a37f | 8634 | mddev->degraded = raid5_calc_degraded(conf); |
908f4fbd | 8635 | spin_unlock_irq(&conf->device_lock); |
ec32a2bd N |
8636 | for (d = conf->raid_disks ; |
8637 | d < conf->raid_disks - mddev->delta_disks; | |
1a67dde0 | 8638 | d++) { |
9aeb7f99 LG |
8639 | rdev = rdev_mdlock_deref(mddev, |
8640 | conf->disks[d].rdev); | |
da7613b8 N |
8641 | if (rdev) |
8642 | clear_bit(In_sync, &rdev->flags); | |
9aeb7f99 LG |
8643 | rdev = rdev_mdlock_deref(mddev, |
8644 | conf->disks[d].replacement); | |
da7613b8 N |
8645 | if (rdev) |
8646 | clear_bit(In_sync, &rdev->flags); | |
1a67dde0 | 8647 | } |
cea9c228 | 8648 | } |
88ce4930 | 8649 | mddev->layout = conf->algorithm; |
09c9e5fa | 8650 | mddev->chunk_sectors = conf->chunk_sectors; |
ec32a2bd N |
8651 | mddev->reshape_position = MaxSector; |
8652 | mddev->delta_disks = 0; | |
2c810cdd | 8653 | mddev->reshape_backwards = 0; |
cea9c228 N |
8654 | } |
8655 | } | |
8656 | ||
b03e0ccb | 8657 | static void raid5_quiesce(struct mddev *mddev, int quiesce) |
72626685 | 8658 | { |
d1688a6d | 8659 | struct r5conf *conf = mddev->private; |
72626685 | 8660 | |
b03e0ccb N |
8661 | if (quiesce) { |
8662 | /* stop all writes */ | |
566c09c5 | 8663 | lock_all_device_hash_locks_irq(conf); |
64bd660b N |
8664 | /* '2' tells resync/reshape to pause so that all |
8665 | * active stripes can drain | |
8666 | */ | |
a39f7afd | 8667 | r5c_flush_cache(conf, INT_MAX); |
97ae2725 GO |
8668 | /* need a memory barrier to make sure read_one_chunk() sees |
8669 | * quiesce started and reverts to slow (locked) path. | |
8670 | */ | |
8671 | smp_store_release(&conf->quiesce, 2); | |
b1b46486 | 8672 | wait_event_cmd(conf->wait_for_quiescent, |
46031f9a RBJ |
8673 | atomic_read(&conf->active_stripes) == 0 && |
8674 | atomic_read(&conf->active_aligned_reads) == 0, | |
566c09c5 SL |
8675 | unlock_all_device_hash_locks_irq(conf), |
8676 | lock_all_device_hash_locks_irq(conf)); | |
64bd660b | 8677 | conf->quiesce = 1; |
566c09c5 | 8678 | unlock_all_device_hash_locks_irq(conf); |
64bd660b N |
8679 | /* allow reshape to continue */ |
8680 | wake_up(&conf->wait_for_overlap); | |
b03e0ccb N |
8681 | } else { |
8682 | /* re-enable writes */ | |
566c09c5 | 8683 | lock_all_device_hash_locks_irq(conf); |
72626685 | 8684 | conf->quiesce = 0; |
b1b46486 | 8685 | wake_up(&conf->wait_for_quiescent); |
e464eafd | 8686 | wake_up(&conf->wait_for_overlap); |
566c09c5 | 8687 | unlock_all_device_hash_locks_irq(conf); |
72626685 | 8688 | } |
1532d9e8 | 8689 | log_quiesce(conf, quiesce); |
72626685 | 8690 | } |
b15c2e57 | 8691 | |
fd01b88c | 8692 | static void *raid45_takeover_raid0(struct mddev *mddev, int level) |
54071b38 | 8693 | { |
e373ab10 | 8694 | struct r0conf *raid0_conf = mddev->private; |
d76c8420 | 8695 | sector_t sectors; |
54071b38 | 8696 | |
f1b29bca | 8697 | /* for raid0 takeover only one zone is supported */ |
e373ab10 | 8698 | if (raid0_conf->nr_strip_zones > 1) { |
cc6167b4 N |
8699 | pr_warn("md/raid:%s: cannot takeover raid0 with more than one zone.\n", |
8700 | mdname(mddev)); | |
f1b29bca DW |
8701 | return ERR_PTR(-EINVAL); |
8702 | } | |
8703 | ||
e373ab10 N |
8704 | sectors = raid0_conf->strip_zone[0].zone_end; |
8705 | sector_div(sectors, raid0_conf->strip_zone[0].nb_dev); | |
3b71bd93 | 8706 | mddev->dev_sectors = sectors; |
f1b29bca | 8707 | mddev->new_level = level; |
54071b38 TM |
8708 | mddev->new_layout = ALGORITHM_PARITY_N; |
8709 | mddev->new_chunk_sectors = mddev->chunk_sectors; | |
8710 | mddev->raid_disks += 1; | |
8711 | mddev->delta_disks = 1; | |
8712 | /* make sure it will be not marked as dirty */ | |
8713 | mddev->recovery_cp = MaxSector; | |
8714 | ||
8715 | return setup_conf(mddev); | |
8716 | } | |
8717 | ||
fd01b88c | 8718 | static void *raid5_takeover_raid1(struct mddev *mddev) |
d562b0c4 N |
8719 | { |
8720 | int chunksect; | |
6995f0b2 | 8721 | void *ret; |
d562b0c4 N |
8722 | |
8723 | if (mddev->raid_disks != 2 || | |
8724 | mddev->degraded > 1) | |
8725 | return ERR_PTR(-EINVAL); | |
8726 | ||
8727 | /* Should check if there are write-behind devices? */ | |
8728 | ||
8729 | chunksect = 64*2; /* 64K by default */ | |
8730 | ||
8731 | /* The array must be an exact multiple of chunksize */ | |
8732 | while (chunksect && (mddev->array_sectors & (chunksect-1))) | |
8733 | chunksect >>= 1; | |
8734 | ||
c911c46c | 8735 | if ((chunksect<<9) < RAID5_STRIPE_SIZE((struct r5conf *)mddev->private)) |
d562b0c4 N |
8736 | /* array size does not allow a suitable chunk size */ |
8737 | return ERR_PTR(-EINVAL); | |
8738 | ||
8739 | mddev->new_level = 5; | |
8740 | mddev->new_layout = ALGORITHM_LEFT_SYMMETRIC; | |
664e7c41 | 8741 | mddev->new_chunk_sectors = chunksect; |
d562b0c4 | 8742 | |
6995f0b2 | 8743 | ret = setup_conf(mddev); |
32cd7cbb | 8744 | if (!IS_ERR(ret)) |
394ed8e4 SL |
8745 | mddev_clear_unsupported_flags(mddev, |
8746 | UNSUPPORTED_MDDEV_FLAGS); | |
6995f0b2 | 8747 | return ret; |
d562b0c4 N |
8748 | } |
8749 | ||
fd01b88c | 8750 | static void *raid5_takeover_raid6(struct mddev *mddev) |
fc9739c6 N |
8751 | { |
8752 | int new_layout; | |
8753 | ||
8754 | switch (mddev->layout) { | |
8755 | case ALGORITHM_LEFT_ASYMMETRIC_6: | |
8756 | new_layout = ALGORITHM_LEFT_ASYMMETRIC; | |
8757 | break; | |
8758 | case ALGORITHM_RIGHT_ASYMMETRIC_6: | |
8759 | new_layout = ALGORITHM_RIGHT_ASYMMETRIC; | |
8760 | break; | |
8761 | case ALGORITHM_LEFT_SYMMETRIC_6: | |
8762 | new_layout = ALGORITHM_LEFT_SYMMETRIC; | |
8763 | break; | |
8764 | case ALGORITHM_RIGHT_SYMMETRIC_6: | |
8765 | new_layout = ALGORITHM_RIGHT_SYMMETRIC; | |
8766 | break; | |
8767 | case ALGORITHM_PARITY_0_6: | |
8768 | new_layout = ALGORITHM_PARITY_0; | |
8769 | break; | |
8770 | case ALGORITHM_PARITY_N: | |
8771 | new_layout = ALGORITHM_PARITY_N; | |
8772 | break; | |
8773 | default: | |
8774 | return ERR_PTR(-EINVAL); | |
8775 | } | |
8776 | mddev->new_level = 5; | |
8777 | mddev->new_layout = new_layout; | |
8778 | mddev->delta_disks = -1; | |
8779 | mddev->raid_disks -= 1; | |
8780 | return setup_conf(mddev); | |
8781 | } | |
8782 | ||
fd01b88c | 8783 | static int raid5_check_reshape(struct mddev *mddev) |
b3546035 | 8784 | { |
88ce4930 N |
8785 | /* For a 2-drive array, the layout and chunk size can be changed |
8786 | * immediately as not restriping is needed. | |
8787 | * For larger arrays we record the new value - after validation | |
8788 | * to be used by a reshape pass. | |
b3546035 | 8789 | */ |
d1688a6d | 8790 | struct r5conf *conf = mddev->private; |
597a711b | 8791 | int new_chunk = mddev->new_chunk_sectors; |
b3546035 | 8792 | |
597a711b | 8793 | if (mddev->new_layout >= 0 && !algorithm_valid_raid5(mddev->new_layout)) |
b3546035 N |
8794 | return -EINVAL; |
8795 | if (new_chunk > 0) { | |
0ba459d2 | 8796 | if (!is_power_of_2(new_chunk)) |
b3546035 | 8797 | return -EINVAL; |
597a711b | 8798 | if (new_chunk < (PAGE_SIZE>>9)) |
b3546035 | 8799 | return -EINVAL; |
597a711b | 8800 | if (mddev->array_sectors & (new_chunk-1)) |
b3546035 N |
8801 | /* not factor of array size */ |
8802 | return -EINVAL; | |
8803 | } | |
8804 | ||
8805 | /* They look valid */ | |
8806 | ||
88ce4930 | 8807 | if (mddev->raid_disks == 2) { |
597a711b N |
8808 | /* can make the change immediately */ |
8809 | if (mddev->new_layout >= 0) { | |
8810 | conf->algorithm = mddev->new_layout; | |
8811 | mddev->layout = mddev->new_layout; | |
88ce4930 N |
8812 | } |
8813 | if (new_chunk > 0) { | |
597a711b N |
8814 | conf->chunk_sectors = new_chunk ; |
8815 | mddev->chunk_sectors = new_chunk; | |
88ce4930 | 8816 | } |
2953079c | 8817 | set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags); |
88ce4930 | 8818 | md_wakeup_thread(mddev->thread); |
b3546035 | 8819 | } |
50ac168a | 8820 | return check_reshape(mddev); |
88ce4930 N |
8821 | } |
8822 | ||
fd01b88c | 8823 | static int raid6_check_reshape(struct mddev *mddev) |
88ce4930 | 8824 | { |
597a711b | 8825 | int new_chunk = mddev->new_chunk_sectors; |
50ac168a | 8826 | |
597a711b | 8827 | if (mddev->new_layout >= 0 && !algorithm_valid_raid6(mddev->new_layout)) |
88ce4930 | 8828 | return -EINVAL; |
b3546035 | 8829 | if (new_chunk > 0) { |
0ba459d2 | 8830 | if (!is_power_of_2(new_chunk)) |
88ce4930 | 8831 | return -EINVAL; |
597a711b | 8832 | if (new_chunk < (PAGE_SIZE >> 9)) |
88ce4930 | 8833 | return -EINVAL; |
597a711b | 8834 | if (mddev->array_sectors & (new_chunk-1)) |
88ce4930 N |
8835 | /* not factor of array size */ |
8836 | return -EINVAL; | |
b3546035 | 8837 | } |
88ce4930 N |
8838 | |
8839 | /* They look valid */ | |
50ac168a | 8840 | return check_reshape(mddev); |
b3546035 N |
8841 | } |
8842 | ||
fd01b88c | 8843 | static void *raid5_takeover(struct mddev *mddev) |
d562b0c4 N |
8844 | { |
8845 | /* raid5 can take over: | |
f1b29bca | 8846 | * raid0 - if there is only one strip zone - make it a raid4 layout |
d562b0c4 N |
8847 | * raid1 - if there are two drives. We need to know the chunk size |
8848 | * raid4 - trivial - just use a raid4 layout. | |
8849 | * raid6 - Providing it is a *_6 layout | |
d562b0c4 | 8850 | */ |
f1b29bca DW |
8851 | if (mddev->level == 0) |
8852 | return raid45_takeover_raid0(mddev, 5); | |
d562b0c4 N |
8853 | if (mddev->level == 1) |
8854 | return raid5_takeover_raid1(mddev); | |
e9d4758f N |
8855 | if (mddev->level == 4) { |
8856 | mddev->new_layout = ALGORITHM_PARITY_N; | |
8857 | mddev->new_level = 5; | |
8858 | return setup_conf(mddev); | |
8859 | } | |
fc9739c6 N |
8860 | if (mddev->level == 6) |
8861 | return raid5_takeover_raid6(mddev); | |
d562b0c4 N |
8862 | |
8863 | return ERR_PTR(-EINVAL); | |
8864 | } | |
8865 | ||
fd01b88c | 8866 | static void *raid4_takeover(struct mddev *mddev) |
a78d38a1 | 8867 | { |
f1b29bca DW |
8868 | /* raid4 can take over: |
8869 | * raid0 - if there is only one strip zone | |
8870 | * raid5 - if layout is right | |
a78d38a1 | 8871 | */ |
f1b29bca DW |
8872 | if (mddev->level == 0) |
8873 | return raid45_takeover_raid0(mddev, 4); | |
a78d38a1 N |
8874 | if (mddev->level == 5 && |
8875 | mddev->layout == ALGORITHM_PARITY_N) { | |
8876 | mddev->new_layout = 0; | |
8877 | mddev->new_level = 4; | |
8878 | return setup_conf(mddev); | |
8879 | } | |
8880 | return ERR_PTR(-EINVAL); | |
8881 | } | |
d562b0c4 | 8882 | |
84fc4b56 | 8883 | static struct md_personality raid5_personality; |
245f46c2 | 8884 | |
fd01b88c | 8885 | static void *raid6_takeover(struct mddev *mddev) |
245f46c2 N |
8886 | { |
8887 | /* Currently can only take over a raid5. We map the | |
8888 | * personality to an equivalent raid6 personality | |
8889 | * with the Q block at the end. | |
8890 | */ | |
8891 | int new_layout; | |
8892 | ||
8893 | if (mddev->pers != &raid5_personality) | |
8894 | return ERR_PTR(-EINVAL); | |
8895 | if (mddev->degraded > 1) | |
8896 | return ERR_PTR(-EINVAL); | |
8897 | if (mddev->raid_disks > 253) | |
8898 | return ERR_PTR(-EINVAL); | |
8899 | if (mddev->raid_disks < 3) | |
8900 | return ERR_PTR(-EINVAL); | |
8901 | ||
8902 | switch (mddev->layout) { | |
8903 | case ALGORITHM_LEFT_ASYMMETRIC: | |
8904 | new_layout = ALGORITHM_LEFT_ASYMMETRIC_6; | |
8905 | break; | |
8906 | case ALGORITHM_RIGHT_ASYMMETRIC: | |
8907 | new_layout = ALGORITHM_RIGHT_ASYMMETRIC_6; | |
8908 | break; | |
8909 | case ALGORITHM_LEFT_SYMMETRIC: | |
8910 | new_layout = ALGORITHM_LEFT_SYMMETRIC_6; | |
8911 | break; | |
8912 | case ALGORITHM_RIGHT_SYMMETRIC: | |
8913 | new_layout = ALGORITHM_RIGHT_SYMMETRIC_6; | |
8914 | break; | |
8915 | case ALGORITHM_PARITY_0: | |
8916 | new_layout = ALGORITHM_PARITY_0_6; | |
8917 | break; | |
8918 | case ALGORITHM_PARITY_N: | |
8919 | new_layout = ALGORITHM_PARITY_N; | |
8920 | break; | |
8921 | default: | |
8922 | return ERR_PTR(-EINVAL); | |
8923 | } | |
8924 | mddev->new_level = 6; | |
8925 | mddev->new_layout = new_layout; | |
8926 | mddev->delta_disks = 1; | |
8927 | mddev->raid_disks += 1; | |
8928 | return setup_conf(mddev); | |
8929 | } | |
8930 | ||
ba903a3e AP |
8931 | static int raid5_change_consistency_policy(struct mddev *mddev, const char *buf) |
8932 | { | |
8933 | struct r5conf *conf; | |
8934 | int err; | |
8935 | ||
8936 | err = mddev_lock(mddev); | |
8937 | if (err) | |
8938 | return err; | |
8939 | conf = mddev->private; | |
8940 | if (!conf) { | |
8941 | mddev_unlock(mddev); | |
8942 | return -ENODEV; | |
8943 | } | |
8944 | ||
845b9e22 | 8945 | if (strncmp(buf, "ppl", 3) == 0) { |
0bb0c105 | 8946 | /* ppl only works with RAID 5 */ |
845b9e22 AP |
8947 | if (!raid5_has_ppl(conf) && conf->level == 5) { |
8948 | err = log_init(conf, NULL, true); | |
8949 | if (!err) { | |
8950 | err = resize_stripes(conf, conf->pool_size); | |
c629f345 LG |
8951 | if (err) { |
8952 | mddev_suspend(mddev); | |
845b9e22 | 8953 | log_exit(conf); |
c629f345 LG |
8954 | mddev_resume(mddev); |
8955 | } | |
845b9e22 | 8956 | } |
0bb0c105 SL |
8957 | } else |
8958 | err = -EINVAL; | |
8959 | } else if (strncmp(buf, "resync", 6) == 0) { | |
8960 | if (raid5_has_ppl(conf)) { | |
8961 | mddev_suspend(mddev); | |
8962 | log_exit(conf); | |
0bb0c105 | 8963 | mddev_resume(mddev); |
845b9e22 | 8964 | err = resize_stripes(conf, conf->pool_size); |
0bb0c105 SL |
8965 | } else if (test_bit(MD_HAS_JOURNAL, &conf->mddev->flags) && |
8966 | r5l_log_disk_error(conf)) { | |
8967 | bool journal_dev_exists = false; | |
8968 | struct md_rdev *rdev; | |
8969 | ||
8970 | rdev_for_each(rdev, mddev) | |
8971 | if (test_bit(Journal, &rdev->flags)) { | |
8972 | journal_dev_exists = true; | |
8973 | break; | |
8974 | } | |
8975 | ||
8976 | if (!journal_dev_exists) { | |
8977 | mddev_suspend(mddev); | |
8978 | clear_bit(MD_HAS_JOURNAL, &mddev->flags); | |
8979 | mddev_resume(mddev); | |
8980 | } else /* need remove journal device first */ | |
8981 | err = -EBUSY; | |
8982 | } else | |
8983 | err = -EINVAL; | |
ba903a3e AP |
8984 | } else { |
8985 | err = -EINVAL; | |
8986 | } | |
8987 | ||
8988 | if (!err) | |
8989 | md_update_sb(mddev, 1); | |
8990 | ||
8991 | mddev_unlock(mddev); | |
8992 | ||
8993 | return err; | |
8994 | } | |
8995 | ||
d5d885fd SL |
8996 | static int raid5_start(struct mddev *mddev) |
8997 | { | |
8998 | struct r5conf *conf = mddev->private; | |
8999 | ||
9000 | return r5l_start(conf->log); | |
9001 | } | |
9002 | ||
84fc4b56 | 9003 | static struct md_personality raid6_personality = |
16a53ecc N |
9004 | { |
9005 | .name = "raid6", | |
9006 | .level = 6, | |
9007 | .owner = THIS_MODULE, | |
849674e4 SL |
9008 | .make_request = raid5_make_request, |
9009 | .run = raid5_run, | |
d5d885fd | 9010 | .start = raid5_start, |
afa0f557 | 9011 | .free = raid5_free, |
849674e4 SL |
9012 | .status = raid5_status, |
9013 | .error_handler = raid5_error, | |
16a53ecc N |
9014 | .hot_add_disk = raid5_add_disk, |
9015 | .hot_remove_disk= raid5_remove_disk, | |
9016 | .spare_active = raid5_spare_active, | |
849674e4 | 9017 | .sync_request = raid5_sync_request, |
16a53ecc | 9018 | .resize = raid5_resize, |
80c3a6ce | 9019 | .size = raid5_size, |
50ac168a | 9020 | .check_reshape = raid6_check_reshape, |
f416885e | 9021 | .start_reshape = raid5_start_reshape, |
cea9c228 | 9022 | .finish_reshape = raid5_finish_reshape, |
16a53ecc | 9023 | .quiesce = raid5_quiesce, |
245f46c2 | 9024 | .takeover = raid6_takeover, |
0bb0c105 | 9025 | .change_consistency_policy = raid5_change_consistency_policy, |
16a53ecc | 9026 | }; |
84fc4b56 | 9027 | static struct md_personality raid5_personality = |
1da177e4 LT |
9028 | { |
9029 | .name = "raid5", | |
2604b703 | 9030 | .level = 5, |
1da177e4 | 9031 | .owner = THIS_MODULE, |
849674e4 SL |
9032 | .make_request = raid5_make_request, |
9033 | .run = raid5_run, | |
d5d885fd | 9034 | .start = raid5_start, |
afa0f557 | 9035 | .free = raid5_free, |
849674e4 SL |
9036 | .status = raid5_status, |
9037 | .error_handler = raid5_error, | |
1da177e4 LT |
9038 | .hot_add_disk = raid5_add_disk, |
9039 | .hot_remove_disk= raid5_remove_disk, | |
9040 | .spare_active = raid5_spare_active, | |
849674e4 | 9041 | .sync_request = raid5_sync_request, |
1da177e4 | 9042 | .resize = raid5_resize, |
80c3a6ce | 9043 | .size = raid5_size, |
63c70c4f N |
9044 | .check_reshape = raid5_check_reshape, |
9045 | .start_reshape = raid5_start_reshape, | |
cea9c228 | 9046 | .finish_reshape = raid5_finish_reshape, |
72626685 | 9047 | .quiesce = raid5_quiesce, |
d562b0c4 | 9048 | .takeover = raid5_takeover, |
ba903a3e | 9049 | .change_consistency_policy = raid5_change_consistency_policy, |
1da177e4 LT |
9050 | }; |
9051 | ||
84fc4b56 | 9052 | static struct md_personality raid4_personality = |
1da177e4 | 9053 | { |
2604b703 N |
9054 | .name = "raid4", |
9055 | .level = 4, | |
9056 | .owner = THIS_MODULE, | |
849674e4 SL |
9057 | .make_request = raid5_make_request, |
9058 | .run = raid5_run, | |
d5d885fd | 9059 | .start = raid5_start, |
afa0f557 | 9060 | .free = raid5_free, |
849674e4 SL |
9061 | .status = raid5_status, |
9062 | .error_handler = raid5_error, | |
2604b703 N |
9063 | .hot_add_disk = raid5_add_disk, |
9064 | .hot_remove_disk= raid5_remove_disk, | |
9065 | .spare_active = raid5_spare_active, | |
849674e4 | 9066 | .sync_request = raid5_sync_request, |
2604b703 | 9067 | .resize = raid5_resize, |
80c3a6ce | 9068 | .size = raid5_size, |
3d37890b N |
9069 | .check_reshape = raid5_check_reshape, |
9070 | .start_reshape = raid5_start_reshape, | |
cea9c228 | 9071 | .finish_reshape = raid5_finish_reshape, |
2604b703 | 9072 | .quiesce = raid5_quiesce, |
a78d38a1 | 9073 | .takeover = raid4_takeover, |
0bb0c105 | 9074 | .change_consistency_policy = raid5_change_consistency_policy, |
2604b703 N |
9075 | }; |
9076 | ||
9077 | static int __init raid5_init(void) | |
9078 | { | |
29c6d1bb SAS |
9079 | int ret; |
9080 | ||
851c30c9 SL |
9081 | raid5_wq = alloc_workqueue("raid5wq", |
9082 | WQ_UNBOUND|WQ_MEM_RECLAIM|WQ_CPU_INTENSIVE|WQ_SYSFS, 0); | |
9083 | if (!raid5_wq) | |
9084 | return -ENOMEM; | |
29c6d1bb SAS |
9085 | |
9086 | ret = cpuhp_setup_state_multi(CPUHP_MD_RAID5_PREPARE, | |
9087 | "md/raid5:prepare", | |
9088 | raid456_cpu_up_prepare, | |
9089 | raid456_cpu_dead); | |
9090 | if (ret) { | |
9091 | destroy_workqueue(raid5_wq); | |
9092 | return ret; | |
9093 | } | |
16a53ecc | 9094 | register_md_personality(&raid6_personality); |
2604b703 N |
9095 | register_md_personality(&raid5_personality); |
9096 | register_md_personality(&raid4_personality); | |
9097 | return 0; | |
1da177e4 LT |
9098 | } |
9099 | ||
2604b703 | 9100 | static void raid5_exit(void) |
1da177e4 | 9101 | { |
16a53ecc | 9102 | unregister_md_personality(&raid6_personality); |
2604b703 N |
9103 | unregister_md_personality(&raid5_personality); |
9104 | unregister_md_personality(&raid4_personality); | |
29c6d1bb | 9105 | cpuhp_remove_multi_state(CPUHP_MD_RAID5_PREPARE); |
851c30c9 | 9106 | destroy_workqueue(raid5_wq); |
1da177e4 LT |
9107 | } |
9108 | ||
9109 | module_init(raid5_init); | |
9110 | module_exit(raid5_exit); | |
9111 | MODULE_LICENSE("GPL"); | |
0efb9e61 | 9112 | MODULE_DESCRIPTION("RAID4/5/6 (striping with parity) personality for MD"); |
1da177e4 | 9113 | MODULE_ALIAS("md-personality-4"); /* RAID5 */ |
d9d166c2 N |
9114 | MODULE_ALIAS("md-raid5"); |
9115 | MODULE_ALIAS("md-raid4"); | |
2604b703 N |
9116 | MODULE_ALIAS("md-level-5"); |
9117 | MODULE_ALIAS("md-level-4"); | |
16a53ecc N |
9118 | MODULE_ALIAS("md-personality-8"); /* RAID6 */ |
9119 | MODULE_ALIAS("md-raid6"); | |
9120 | MODULE_ALIAS("md-level-6"); | |
9121 | ||
9122 | /* This used to be two separate modules, they were: */ | |
9123 | MODULE_ALIAS("raid5"); | |
9124 | MODULE_ALIAS("raid6"); |