Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * raid5.c : Multiple Devices driver for Linux | |
3 | * Copyright (C) 1996, 1997 Ingo Molnar, Miguel de Icaza, Gadi Oxman | |
4 | * Copyright (C) 1999, 2000 Ingo Molnar | |
16a53ecc | 5 | * Copyright (C) 2002, 2003 H. Peter Anvin |
1da177e4 | 6 | * |
16a53ecc N |
7 | * RAID-4/5/6 management functions. |
8 | * Thanks to Penguin Computing for making the RAID-6 development possible | |
9 | * by donating a test server! | |
1da177e4 LT |
10 | * |
11 | * This program is free software; you can redistribute it and/or modify | |
12 | * it under the terms of the GNU General Public License as published by | |
13 | * the Free Software Foundation; either version 2, or (at your option) | |
14 | * any later version. | |
15 | * | |
16 | * You should have received a copy of the GNU General Public License | |
17 | * (for example /usr/src/linux/COPYING); if not, write to the Free | |
18 | * Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. | |
19 | */ | |
20 | ||
ae3c20cc N |
21 | /* |
22 | * BITMAP UNPLUGGING: | |
23 | * | |
24 | * The sequencing for updating the bitmap reliably is a little | |
25 | * subtle (and I got it wrong the first time) so it deserves some | |
26 | * explanation. | |
27 | * | |
28 | * We group bitmap updates into batches. Each batch has a number. | |
29 | * We may write out several batches at once, but that isn't very important. | |
7c13edc8 N |
30 | * conf->seq_write is the number of the last batch successfully written. |
31 | * conf->seq_flush is the number of the last batch that was closed to | |
ae3c20cc N |
32 | * new additions. |
33 | * When we discover that we will need to write to any block in a stripe | |
34 | * (in add_stripe_bio) we update the in-memory bitmap and record in sh->bm_seq | |
7c13edc8 | 35 | * the number of the batch it will be in. This is seq_flush+1. |
ae3c20cc N |
36 | * When we are ready to do a write, if that batch hasn't been written yet, |
37 | * we plug the array and queue the stripe for later. | |
38 | * When an unplug happens, we increment bm_flush, thus closing the current | |
39 | * batch. | |
40 | * When we notice that bm_flush > bm_write, we write out all pending updates | |
41 | * to the bitmap, and advance bm_write to where bm_flush was. | |
42 | * This may occasionally write a bit out twice, but is sure never to | |
43 | * miss any bits. | |
44 | */ | |
1da177e4 | 45 | |
bff61975 | 46 | #include <linux/blkdev.h> |
f6705578 | 47 | #include <linux/kthread.h> |
f701d589 | 48 | #include <linux/raid/pq.h> |
91c00924 | 49 | #include <linux/async_tx.h> |
056075c7 | 50 | #include <linux/module.h> |
07a3b417 | 51 | #include <linux/async.h> |
bff61975 | 52 | #include <linux/seq_file.h> |
36d1c647 | 53 | #include <linux/cpu.h> |
5a0e3ad6 | 54 | #include <linux/slab.h> |
8bda470e | 55 | #include <linux/ratelimit.h> |
851c30c9 | 56 | #include <linux/nodemask.h> |
46d5b785 | 57 | #include <linux/flex_array.h> |
3f07c014 | 58 | |
a9add5d9 | 59 | #include <trace/events/block.h> |
aaf9f12e | 60 | #include <linux/list_sort.h> |
a9add5d9 | 61 | |
43b2e5d8 | 62 | #include "md.h" |
bff61975 | 63 | #include "raid5.h" |
54071b38 | 64 | #include "raid0.h" |
935fe098 | 65 | #include "md-bitmap.h" |
ff875738 | 66 | #include "raid5-log.h" |
72626685 | 67 | |
394ed8e4 SL |
68 | #define UNSUPPORTED_MDDEV_FLAGS (1L << MD_FAILFAST_SUPPORTED) |
69 | ||
851c30c9 SL |
70 | #define cpu_to_group(cpu) cpu_to_node(cpu) |
71 | #define ANY_GROUP NUMA_NO_NODE | |
72 | ||
8e0e99ba N |
73 | static bool devices_handle_discard_safely = false; |
74 | module_param(devices_handle_discard_safely, bool, 0644); | |
75 | MODULE_PARM_DESC(devices_handle_discard_safely, | |
76 | "Set to Y if all devices in each array reliably return zeroes on reads from discarded regions"); | |
851c30c9 | 77 | static struct workqueue_struct *raid5_wq; |
1da177e4 | 78 | |
d1688a6d | 79 | static inline struct hlist_head *stripe_hash(struct r5conf *conf, sector_t sect) |
db298e19 N |
80 | { |
81 | int hash = (sect >> STRIPE_SHIFT) & HASH_MASK; | |
82 | return &conf->stripe_hashtbl[hash]; | |
83 | } | |
1da177e4 | 84 | |
566c09c5 SL |
85 | static inline int stripe_hash_locks_hash(sector_t sect) |
86 | { | |
87 | return (sect >> STRIPE_SHIFT) & STRIPE_HASH_LOCKS_MASK; | |
88 | } | |
89 | ||
90 | static inline void lock_device_hash_lock(struct r5conf *conf, int hash) | |
91 | { | |
92 | spin_lock_irq(conf->hash_locks + hash); | |
93 | spin_lock(&conf->device_lock); | |
94 | } | |
95 | ||
96 | static inline void unlock_device_hash_lock(struct r5conf *conf, int hash) | |
97 | { | |
98 | spin_unlock(&conf->device_lock); | |
99 | spin_unlock_irq(conf->hash_locks + hash); | |
100 | } | |
101 | ||
102 | static inline void lock_all_device_hash_locks_irq(struct r5conf *conf) | |
103 | { | |
104 | int i; | |
3d05f3ae | 105 | spin_lock_irq(conf->hash_locks); |
566c09c5 SL |
106 | for (i = 1; i < NR_STRIPE_HASH_LOCKS; i++) |
107 | spin_lock_nest_lock(conf->hash_locks + i, conf->hash_locks); | |
108 | spin_lock(&conf->device_lock); | |
109 | } | |
110 | ||
111 | static inline void unlock_all_device_hash_locks_irq(struct r5conf *conf) | |
112 | { | |
113 | int i; | |
114 | spin_unlock(&conf->device_lock); | |
3d05f3ae JC |
115 | for (i = NR_STRIPE_HASH_LOCKS - 1; i; i--) |
116 | spin_unlock(conf->hash_locks + i); | |
117 | spin_unlock_irq(conf->hash_locks); | |
566c09c5 SL |
118 | } |
119 | ||
d0dabf7e N |
120 | /* Find first data disk in a raid6 stripe */ |
121 | static inline int raid6_d0(struct stripe_head *sh) | |
122 | { | |
67cc2b81 N |
123 | if (sh->ddf_layout) |
124 | /* ddf always start from first device */ | |
125 | return 0; | |
126 | /* md starts just after Q block */ | |
d0dabf7e N |
127 | if (sh->qd_idx == sh->disks - 1) |
128 | return 0; | |
129 | else | |
130 | return sh->qd_idx + 1; | |
131 | } | |
16a53ecc N |
132 | static inline int raid6_next_disk(int disk, int raid_disks) |
133 | { | |
134 | disk++; | |
135 | return (disk < raid_disks) ? disk : 0; | |
136 | } | |
a4456856 | 137 | |
d0dabf7e N |
138 | /* When walking through the disks in a raid5, starting at raid6_d0, |
139 | * We need to map each disk to a 'slot', where the data disks are slot | |
140 | * 0 .. raid_disks-3, the parity disk is raid_disks-2 and the Q disk | |
141 | * is raid_disks-1. This help does that mapping. | |
142 | */ | |
67cc2b81 N |
143 | static int raid6_idx_to_slot(int idx, struct stripe_head *sh, |
144 | int *count, int syndrome_disks) | |
d0dabf7e | 145 | { |
6629542e | 146 | int slot = *count; |
67cc2b81 | 147 | |
e4424fee | 148 | if (sh->ddf_layout) |
6629542e | 149 | (*count)++; |
d0dabf7e | 150 | if (idx == sh->pd_idx) |
67cc2b81 | 151 | return syndrome_disks; |
d0dabf7e | 152 | if (idx == sh->qd_idx) |
67cc2b81 | 153 | return syndrome_disks + 1; |
e4424fee | 154 | if (!sh->ddf_layout) |
6629542e | 155 | (*count)++; |
d0dabf7e N |
156 | return slot; |
157 | } | |
158 | ||
d1688a6d | 159 | static void print_raid5_conf (struct r5conf *conf); |
1da177e4 | 160 | |
600aa109 DW |
161 | static int stripe_operations_active(struct stripe_head *sh) |
162 | { | |
163 | return sh->check_state || sh->reconstruct_state || | |
164 | test_bit(STRIPE_BIOFILL_RUN, &sh->state) || | |
165 | test_bit(STRIPE_COMPUTE_RUN, &sh->state); | |
166 | } | |
167 | ||
535ae4eb SL |
168 | static bool stripe_is_lowprio(struct stripe_head *sh) |
169 | { | |
170 | return (test_bit(STRIPE_R5C_FULL_STRIPE, &sh->state) || | |
171 | test_bit(STRIPE_R5C_PARTIAL_STRIPE, &sh->state)) && | |
172 | !test_bit(STRIPE_R5C_CACHING, &sh->state); | |
173 | } | |
174 | ||
851c30c9 SL |
175 | static void raid5_wakeup_stripe_thread(struct stripe_head *sh) |
176 | { | |
177 | struct r5conf *conf = sh->raid_conf; | |
178 | struct r5worker_group *group; | |
bfc90cb0 | 179 | int thread_cnt; |
851c30c9 SL |
180 | int i, cpu = sh->cpu; |
181 | ||
182 | if (!cpu_online(cpu)) { | |
183 | cpu = cpumask_any(cpu_online_mask); | |
184 | sh->cpu = cpu; | |
185 | } | |
186 | ||
187 | if (list_empty(&sh->lru)) { | |
188 | struct r5worker_group *group; | |
189 | group = conf->worker_groups + cpu_to_group(cpu); | |
535ae4eb SL |
190 | if (stripe_is_lowprio(sh)) |
191 | list_add_tail(&sh->lru, &group->loprio_list); | |
192 | else | |
193 | list_add_tail(&sh->lru, &group->handle_list); | |
bfc90cb0 SL |
194 | group->stripes_cnt++; |
195 | sh->group = group; | |
851c30c9 SL |
196 | } |
197 | ||
198 | if (conf->worker_cnt_per_group == 0) { | |
199 | md_wakeup_thread(conf->mddev->thread); | |
200 | return; | |
201 | } | |
202 | ||
203 | group = conf->worker_groups + cpu_to_group(sh->cpu); | |
204 | ||
bfc90cb0 SL |
205 | group->workers[0].working = true; |
206 | /* at least one worker should run to avoid race */ | |
207 | queue_work_on(sh->cpu, raid5_wq, &group->workers[0].work); | |
208 | ||
209 | thread_cnt = group->stripes_cnt / MAX_STRIPE_BATCH - 1; | |
210 | /* wakeup more workers */ | |
211 | for (i = 1; i < conf->worker_cnt_per_group && thread_cnt > 0; i++) { | |
212 | if (group->workers[i].working == false) { | |
213 | group->workers[i].working = true; | |
214 | queue_work_on(sh->cpu, raid5_wq, | |
215 | &group->workers[i].work); | |
216 | thread_cnt--; | |
217 | } | |
218 | } | |
851c30c9 SL |
219 | } |
220 | ||
566c09c5 SL |
221 | static void do_release_stripe(struct r5conf *conf, struct stripe_head *sh, |
222 | struct list_head *temp_inactive_list) | |
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) | |
4eb788df SL |
308 | { |
309 | if (atomic_dec_and_test(&sh->count)) | |
566c09c5 SL |
310 | do_release_stripe(conf, sh, temp_inactive_list); |
311 | } | |
312 | ||
313 | /* | |
314 | * @hash could be NR_STRIPE_HASH_LOCKS, then we have a list of inactive_list | |
315 | * | |
316 | * Be careful: Only one task can add/delete stripes from temp_inactive_list at | |
317 | * given time. Adding stripes only takes device lock, while deleting stripes | |
318 | * only takes hash lock. | |
319 | */ | |
320 | static void release_inactive_stripe_list(struct r5conf *conf, | |
321 | struct list_head *temp_inactive_list, | |
322 | int hash) | |
323 | { | |
324 | int size; | |
6ab2a4b8 | 325 | bool do_wakeup = false; |
566c09c5 SL |
326 | unsigned long flags; |
327 | ||
328 | if (hash == NR_STRIPE_HASH_LOCKS) { | |
329 | size = NR_STRIPE_HASH_LOCKS; | |
330 | hash = NR_STRIPE_HASH_LOCKS - 1; | |
331 | } else | |
332 | size = 1; | |
333 | while (size) { | |
334 | struct list_head *list = &temp_inactive_list[size - 1]; | |
335 | ||
336 | /* | |
6d036f7d | 337 | * We don't hold any lock here yet, raid5_get_active_stripe() might |
566c09c5 SL |
338 | * remove stripes from the list |
339 | */ | |
340 | if (!list_empty_careful(list)) { | |
341 | spin_lock_irqsave(conf->hash_locks + hash, flags); | |
4bda556a SL |
342 | if (list_empty(conf->inactive_list + hash) && |
343 | !list_empty(list)) | |
344 | atomic_dec(&conf->empty_inactive_list_nr); | |
566c09c5 | 345 | list_splice_tail_init(list, conf->inactive_list + hash); |
6ab2a4b8 | 346 | do_wakeup = true; |
566c09c5 SL |
347 | spin_unlock_irqrestore(conf->hash_locks + hash, flags); |
348 | } | |
349 | size--; | |
350 | hash--; | |
351 | } | |
352 | ||
353 | if (do_wakeup) { | |
6ab2a4b8 | 354 | wake_up(&conf->wait_for_stripe); |
b1b46486 YL |
355 | if (atomic_read(&conf->active_stripes) == 0) |
356 | wake_up(&conf->wait_for_quiescent); | |
566c09c5 SL |
357 | if (conf->retry_read_aligned) |
358 | md_wakeup_thread(conf->mddev->thread); | |
359 | } | |
4eb788df SL |
360 | } |
361 | ||
773ca82f | 362 | /* should hold conf->device_lock already */ |
566c09c5 SL |
363 | static int release_stripe_list(struct r5conf *conf, |
364 | struct list_head *temp_inactive_list) | |
773ca82f | 365 | { |
eae8263f | 366 | struct stripe_head *sh, *t; |
773ca82f SL |
367 | int count = 0; |
368 | struct llist_node *head; | |
369 | ||
370 | head = llist_del_all(&conf->released_stripes); | |
d265d9dc | 371 | head = llist_reverse_order(head); |
eae8263f | 372 | llist_for_each_entry_safe(sh, t, head, release_list) { |
566c09c5 SL |
373 | int hash; |
374 | ||
773ca82f SL |
375 | /* sh could be readded after STRIPE_ON_RELEASE_LIST is cleard */ |
376 | smp_mb(); | |
377 | clear_bit(STRIPE_ON_RELEASE_LIST, &sh->state); | |
378 | /* | |
379 | * Don't worry the bit is set here, because if the bit is set | |
380 | * again, the count is always > 1. This is true for | |
381 | * STRIPE_ON_UNPLUG_LIST bit too. | |
382 | */ | |
566c09c5 SL |
383 | hash = sh->hash_lock_index; |
384 | __release_stripe(conf, sh, &temp_inactive_list[hash]); | |
773ca82f SL |
385 | count++; |
386 | } | |
387 | ||
388 | return count; | |
389 | } | |
390 | ||
6d036f7d | 391 | void raid5_release_stripe(struct stripe_head *sh) |
1da177e4 | 392 | { |
d1688a6d | 393 | struct r5conf *conf = sh->raid_conf; |
1da177e4 | 394 | unsigned long flags; |
566c09c5 SL |
395 | struct list_head list; |
396 | int hash; | |
773ca82f | 397 | bool wakeup; |
16a53ecc | 398 | |
cf170f3f ES |
399 | /* Avoid release_list until the last reference. |
400 | */ | |
401 | if (atomic_add_unless(&sh->count, -1, 1)) | |
402 | return; | |
403 | ||
ad4068de | 404 | if (unlikely(!conf->mddev->thread) || |
405 | test_and_set_bit(STRIPE_ON_RELEASE_LIST, &sh->state)) | |
773ca82f SL |
406 | goto slow_path; |
407 | wakeup = llist_add(&sh->release_list, &conf->released_stripes); | |
408 | if (wakeup) | |
409 | md_wakeup_thread(conf->mddev->thread); | |
410 | return; | |
411 | slow_path: | |
4eb788df | 412 | local_irq_save(flags); |
773ca82f | 413 | /* we are ok here if STRIPE_ON_RELEASE_LIST is set or not */ |
4eb788df | 414 | if (atomic_dec_and_lock(&sh->count, &conf->device_lock)) { |
566c09c5 SL |
415 | INIT_LIST_HEAD(&list); |
416 | hash = sh->hash_lock_index; | |
417 | do_release_stripe(conf, sh, &list); | |
4eb788df | 418 | spin_unlock(&conf->device_lock); |
566c09c5 | 419 | release_inactive_stripe_list(conf, &list, hash); |
4eb788df SL |
420 | } |
421 | local_irq_restore(flags); | |
1da177e4 LT |
422 | } |
423 | ||
fccddba0 | 424 | static inline void remove_hash(struct stripe_head *sh) |
1da177e4 | 425 | { |
45b4233c DW |
426 | pr_debug("remove_hash(), stripe %llu\n", |
427 | (unsigned long long)sh->sector); | |
1da177e4 | 428 | |
fccddba0 | 429 | hlist_del_init(&sh->hash); |
1da177e4 LT |
430 | } |
431 | ||
d1688a6d | 432 | static inline void insert_hash(struct r5conf *conf, struct stripe_head *sh) |
1da177e4 | 433 | { |
fccddba0 | 434 | struct hlist_head *hp = stripe_hash(conf, sh->sector); |
1da177e4 | 435 | |
45b4233c DW |
436 | pr_debug("insert_hash(), stripe %llu\n", |
437 | (unsigned long long)sh->sector); | |
1da177e4 | 438 | |
fccddba0 | 439 | hlist_add_head(&sh->hash, hp); |
1da177e4 LT |
440 | } |
441 | ||
1da177e4 | 442 | /* find an idle stripe, make sure it is unhashed, and return it. */ |
566c09c5 | 443 | static struct stripe_head *get_free_stripe(struct r5conf *conf, int hash) |
1da177e4 LT |
444 | { |
445 | struct stripe_head *sh = NULL; | |
446 | struct list_head *first; | |
447 | ||
566c09c5 | 448 | if (list_empty(conf->inactive_list + hash)) |
1da177e4 | 449 | goto out; |
566c09c5 | 450 | first = (conf->inactive_list + hash)->next; |
1da177e4 LT |
451 | sh = list_entry(first, struct stripe_head, lru); |
452 | list_del_init(first); | |
453 | remove_hash(sh); | |
454 | atomic_inc(&conf->active_stripes); | |
566c09c5 | 455 | BUG_ON(hash != sh->hash_lock_index); |
4bda556a SL |
456 | if (list_empty(conf->inactive_list + hash)) |
457 | atomic_inc(&conf->empty_inactive_list_nr); | |
1da177e4 LT |
458 | out: |
459 | return sh; | |
460 | } | |
461 | ||
e4e11e38 | 462 | static void shrink_buffers(struct stripe_head *sh) |
1da177e4 LT |
463 | { |
464 | struct page *p; | |
465 | int i; | |
e4e11e38 | 466 | int num = sh->raid_conf->pool_size; |
1da177e4 | 467 | |
e4e11e38 | 468 | for (i = 0; i < num ; i++) { |
d592a996 | 469 | WARN_ON(sh->dev[i].page != sh->dev[i].orig_page); |
1da177e4 LT |
470 | p = sh->dev[i].page; |
471 | if (!p) | |
472 | continue; | |
473 | sh->dev[i].page = NULL; | |
2d1f3b5d | 474 | put_page(p); |
1da177e4 LT |
475 | } |
476 | } | |
477 | ||
a9683a79 | 478 | static int grow_buffers(struct stripe_head *sh, gfp_t gfp) |
1da177e4 LT |
479 | { |
480 | int i; | |
e4e11e38 | 481 | int num = sh->raid_conf->pool_size; |
1da177e4 | 482 | |
e4e11e38 | 483 | for (i = 0; i < num; i++) { |
1da177e4 LT |
484 | struct page *page; |
485 | ||
a9683a79 | 486 | if (!(page = alloc_page(gfp))) { |
1da177e4 LT |
487 | return 1; |
488 | } | |
489 | sh->dev[i].page = page; | |
d592a996 | 490 | sh->dev[i].orig_page = page; |
1da177e4 | 491 | } |
3418d036 | 492 | |
1da177e4 LT |
493 | return 0; |
494 | } | |
495 | ||
d1688a6d | 496 | static void stripe_set_idx(sector_t stripe, struct r5conf *conf, int previous, |
911d4ee8 | 497 | struct stripe_head *sh); |
1da177e4 | 498 | |
b5663ba4 | 499 | static void init_stripe(struct stripe_head *sh, sector_t sector, int previous) |
1da177e4 | 500 | { |
d1688a6d | 501 | struct r5conf *conf = sh->raid_conf; |
566c09c5 | 502 | int i, seq; |
1da177e4 | 503 | |
78bafebd ES |
504 | BUG_ON(atomic_read(&sh->count) != 0); |
505 | BUG_ON(test_bit(STRIPE_HANDLE, &sh->state)); | |
600aa109 | 506 | BUG_ON(stripe_operations_active(sh)); |
59fc630b | 507 | BUG_ON(sh->batch_head); |
d84e0f10 | 508 | |
45b4233c | 509 | pr_debug("init_stripe called, stripe %llu\n", |
b8e6a15a | 510 | (unsigned long long)sector); |
566c09c5 SL |
511 | retry: |
512 | seq = read_seqcount_begin(&conf->gen_lock); | |
86b42c71 | 513 | sh->generation = conf->generation - previous; |
b5663ba4 | 514 | sh->disks = previous ? conf->previous_raid_disks : conf->raid_disks; |
1da177e4 | 515 | sh->sector = sector; |
911d4ee8 | 516 | stripe_set_idx(sector, conf, previous, sh); |
1da177e4 LT |
517 | sh->state = 0; |
518 | ||
7ecaa1e6 | 519 | for (i = sh->disks; i--; ) { |
1da177e4 LT |
520 | struct r5dev *dev = &sh->dev[i]; |
521 | ||
d84e0f10 | 522 | if (dev->toread || dev->read || dev->towrite || dev->written || |
1da177e4 | 523 | test_bit(R5_LOCKED, &dev->flags)) { |
cc6167b4 | 524 | pr_err("sector=%llx i=%d %p %p %p %p %d\n", |
1da177e4 | 525 | (unsigned long long)sh->sector, i, dev->toread, |
d84e0f10 | 526 | dev->read, dev->towrite, dev->written, |
1da177e4 | 527 | test_bit(R5_LOCKED, &dev->flags)); |
8cfa7b0f | 528 | WARN_ON(1); |
1da177e4 LT |
529 | } |
530 | dev->flags = 0; | |
27a4ff8f | 531 | dev->sector = raid5_compute_blocknr(sh, i, previous); |
1da177e4 | 532 | } |
566c09c5 SL |
533 | if (read_seqcount_retry(&conf->gen_lock, seq)) |
534 | goto retry; | |
7a87f434 | 535 | sh->overwrite_disks = 0; |
1da177e4 | 536 | insert_hash(conf, sh); |
851c30c9 | 537 | sh->cpu = smp_processor_id(); |
da41ba65 | 538 | set_bit(STRIPE_BATCH_READY, &sh->state); |
1da177e4 LT |
539 | } |
540 | ||
d1688a6d | 541 | static struct stripe_head *__find_stripe(struct r5conf *conf, sector_t sector, |
86b42c71 | 542 | short generation) |
1da177e4 LT |
543 | { |
544 | struct stripe_head *sh; | |
545 | ||
45b4233c | 546 | pr_debug("__find_stripe, sector %llu\n", (unsigned long long)sector); |
b67bfe0d | 547 | hlist_for_each_entry(sh, stripe_hash(conf, sector), hash) |
86b42c71 | 548 | if (sh->sector == sector && sh->generation == generation) |
1da177e4 | 549 | return sh; |
45b4233c | 550 | pr_debug("__stripe %llu not in cache\n", (unsigned long long)sector); |
1da177e4 LT |
551 | return NULL; |
552 | } | |
553 | ||
674806d6 N |
554 | /* |
555 | * Need to check if array has failed when deciding whether to: | |
556 | * - start an array | |
557 | * - remove non-faulty devices | |
558 | * - add a spare | |
559 | * - allow a reshape | |
560 | * This determination is simple when no reshape is happening. | |
561 | * However if there is a reshape, we need to carefully check | |
562 | * both the before and after sections. | |
563 | * This is because some failed devices may only affect one | |
564 | * of the two sections, and some non-in_sync devices may | |
565 | * be insync in the section most affected by failed devices. | |
566 | */ | |
2e38a37f | 567 | int raid5_calc_degraded(struct r5conf *conf) |
674806d6 | 568 | { |
908f4fbd | 569 | int degraded, degraded2; |
674806d6 | 570 | int i; |
674806d6 N |
571 | |
572 | rcu_read_lock(); | |
573 | degraded = 0; | |
574 | for (i = 0; i < conf->previous_raid_disks; i++) { | |
3cb03002 | 575 | struct md_rdev *rdev = rcu_dereference(conf->disks[i].rdev); |
e5c86471 N |
576 | if (rdev && test_bit(Faulty, &rdev->flags)) |
577 | rdev = rcu_dereference(conf->disks[i].replacement); | |
674806d6 N |
578 | if (!rdev || test_bit(Faulty, &rdev->flags)) |
579 | degraded++; | |
580 | else if (test_bit(In_sync, &rdev->flags)) | |
581 | ; | |
582 | else | |
583 | /* not in-sync or faulty. | |
584 | * If the reshape increases the number of devices, | |
585 | * this is being recovered by the reshape, so | |
586 | * this 'previous' section is not in_sync. | |
587 | * If the number of devices is being reduced however, | |
588 | * the device can only be part of the array if | |
589 | * we are reverting a reshape, so this section will | |
590 | * be in-sync. | |
591 | */ | |
592 | if (conf->raid_disks >= conf->previous_raid_disks) | |
593 | degraded++; | |
594 | } | |
595 | rcu_read_unlock(); | |
908f4fbd N |
596 | if (conf->raid_disks == conf->previous_raid_disks) |
597 | return degraded; | |
674806d6 | 598 | rcu_read_lock(); |
908f4fbd | 599 | degraded2 = 0; |
674806d6 | 600 | for (i = 0; i < conf->raid_disks; i++) { |
3cb03002 | 601 | struct md_rdev *rdev = rcu_dereference(conf->disks[i].rdev); |
e5c86471 N |
602 | if (rdev && test_bit(Faulty, &rdev->flags)) |
603 | rdev = rcu_dereference(conf->disks[i].replacement); | |
674806d6 | 604 | if (!rdev || test_bit(Faulty, &rdev->flags)) |
908f4fbd | 605 | degraded2++; |
674806d6 N |
606 | else if (test_bit(In_sync, &rdev->flags)) |
607 | ; | |
608 | else | |
609 | /* not in-sync or faulty. | |
610 | * If reshape increases the number of devices, this | |
611 | * section has already been recovered, else it | |
612 | * almost certainly hasn't. | |
613 | */ | |
614 | if (conf->raid_disks <= conf->previous_raid_disks) | |
908f4fbd | 615 | degraded2++; |
674806d6 N |
616 | } |
617 | rcu_read_unlock(); | |
908f4fbd N |
618 | if (degraded2 > degraded) |
619 | return degraded2; | |
620 | return degraded; | |
621 | } | |
622 | ||
623 | static int has_failed(struct r5conf *conf) | |
624 | { | |
625 | int degraded; | |
626 | ||
627 | if (conf->mddev->reshape_position == MaxSector) | |
628 | return conf->mddev->degraded > conf->max_degraded; | |
629 | ||
2e38a37f | 630 | degraded = raid5_calc_degraded(conf); |
674806d6 N |
631 | if (degraded > conf->max_degraded) |
632 | return 1; | |
633 | return 0; | |
634 | } | |
635 | ||
6d036f7d SL |
636 | struct stripe_head * |
637 | raid5_get_active_stripe(struct r5conf *conf, sector_t sector, | |
638 | int previous, int noblock, int noquiesce) | |
1da177e4 LT |
639 | { |
640 | struct stripe_head *sh; | |
566c09c5 | 641 | int hash = stripe_hash_locks_hash(sector); |
ff00d3b4 | 642 | int inc_empty_inactive_list_flag; |
1da177e4 | 643 | |
45b4233c | 644 | pr_debug("get_stripe, sector %llu\n", (unsigned long long)sector); |
1da177e4 | 645 | |
566c09c5 | 646 | spin_lock_irq(conf->hash_locks + hash); |
1da177e4 LT |
647 | |
648 | do { | |
b1b46486 | 649 | wait_event_lock_irq(conf->wait_for_quiescent, |
a8c906ca | 650 | conf->quiesce == 0 || noquiesce, |
566c09c5 | 651 | *(conf->hash_locks + hash)); |
86b42c71 | 652 | sh = __find_stripe(conf, sector, conf->generation - previous); |
1da177e4 | 653 | if (!sh) { |
edbe83ab | 654 | if (!test_bit(R5_INACTIVE_BLOCKED, &conf->cache_state)) { |
566c09c5 | 655 | sh = get_free_stripe(conf, hash); |
713bc5c2 SL |
656 | if (!sh && !test_bit(R5_DID_ALLOC, |
657 | &conf->cache_state)) | |
edbe83ab N |
658 | set_bit(R5_ALLOC_MORE, |
659 | &conf->cache_state); | |
660 | } | |
1da177e4 LT |
661 | if (noblock && sh == NULL) |
662 | break; | |
a39f7afd SL |
663 | |
664 | r5c_check_stripe_cache_usage(conf); | |
1da177e4 | 665 | if (!sh) { |
5423399a N |
666 | set_bit(R5_INACTIVE_BLOCKED, |
667 | &conf->cache_state); | |
a39f7afd | 668 | r5l_wake_reclaim(conf->log, 0); |
6ab2a4b8 SL |
669 | wait_event_lock_irq( |
670 | conf->wait_for_stripe, | |
566c09c5 SL |
671 | !list_empty(conf->inactive_list + hash) && |
672 | (atomic_read(&conf->active_stripes) | |
673 | < (conf->max_nr_stripes * 3 / 4) | |
5423399a N |
674 | || !test_bit(R5_INACTIVE_BLOCKED, |
675 | &conf->cache_state)), | |
6ab2a4b8 | 676 | *(conf->hash_locks + hash)); |
5423399a N |
677 | clear_bit(R5_INACTIVE_BLOCKED, |
678 | &conf->cache_state); | |
7da9d450 | 679 | } else { |
b5663ba4 | 680 | init_stripe(sh, sector, previous); |
7da9d450 N |
681 | atomic_inc(&sh->count); |
682 | } | |
e240c183 | 683 | } else if (!atomic_inc_not_zero(&sh->count)) { |
6d183de4 | 684 | spin_lock(&conf->device_lock); |
e240c183 | 685 | if (!atomic_read(&sh->count)) { |
1da177e4 LT |
686 | if (!test_bit(STRIPE_HANDLE, &sh->state)) |
687 | atomic_inc(&conf->active_stripes); | |
5af9bef7 N |
688 | BUG_ON(list_empty(&sh->lru) && |
689 | !test_bit(STRIPE_EXPANDING, &sh->state)); | |
ff00d3b4 ZL |
690 | inc_empty_inactive_list_flag = 0; |
691 | if (!list_empty(conf->inactive_list + hash)) | |
692 | inc_empty_inactive_list_flag = 1; | |
16a53ecc | 693 | list_del_init(&sh->lru); |
ff00d3b4 ZL |
694 | if (list_empty(conf->inactive_list + hash) && inc_empty_inactive_list_flag) |
695 | atomic_inc(&conf->empty_inactive_list_nr); | |
bfc90cb0 SL |
696 | if (sh->group) { |
697 | sh->group->stripes_cnt--; | |
698 | sh->group = NULL; | |
699 | } | |
1da177e4 | 700 | } |
7da9d450 | 701 | atomic_inc(&sh->count); |
6d183de4 | 702 | spin_unlock(&conf->device_lock); |
1da177e4 LT |
703 | } |
704 | } while (sh == NULL); | |
705 | ||
566c09c5 | 706 | spin_unlock_irq(conf->hash_locks + hash); |
1da177e4 LT |
707 | return sh; |
708 | } | |
709 | ||
7a87f434 | 710 | static bool is_full_stripe_write(struct stripe_head *sh) |
711 | { | |
712 | BUG_ON(sh->overwrite_disks > (sh->disks - sh->raid_conf->max_degraded)); | |
713 | return sh->overwrite_disks == (sh->disks - sh->raid_conf->max_degraded); | |
714 | } | |
715 | ||
59fc630b | 716 | static void lock_two_stripes(struct stripe_head *sh1, struct stripe_head *sh2) |
717 | { | |
59fc630b | 718 | if (sh1 > sh2) { |
3d05f3ae | 719 | spin_lock_irq(&sh2->stripe_lock); |
59fc630b | 720 | spin_lock_nested(&sh1->stripe_lock, 1); |
721 | } else { | |
3d05f3ae | 722 | spin_lock_irq(&sh1->stripe_lock); |
59fc630b | 723 | spin_lock_nested(&sh2->stripe_lock, 1); |
724 | } | |
725 | } | |
726 | ||
727 | static void unlock_two_stripes(struct stripe_head *sh1, struct stripe_head *sh2) | |
728 | { | |
729 | spin_unlock(&sh1->stripe_lock); | |
3d05f3ae | 730 | spin_unlock_irq(&sh2->stripe_lock); |
59fc630b | 731 | } |
732 | ||
733 | /* Only freshly new full stripe normal write stripe can be added to a batch list */ | |
734 | static bool stripe_can_batch(struct stripe_head *sh) | |
735 | { | |
9c3e333d SL |
736 | struct r5conf *conf = sh->raid_conf; |
737 | ||
3418d036 | 738 | if (conf->log || raid5_has_ppl(conf)) |
9c3e333d | 739 | return false; |
59fc630b | 740 | return test_bit(STRIPE_BATCH_READY, &sh->state) && |
d0852df5 | 741 | !test_bit(STRIPE_BITMAP_PENDING, &sh->state) && |
59fc630b | 742 | is_full_stripe_write(sh); |
743 | } | |
744 | ||
745 | /* we only do back search */ | |
746 | static void stripe_add_to_batch_list(struct r5conf *conf, struct stripe_head *sh) | |
747 | { | |
748 | struct stripe_head *head; | |
749 | sector_t head_sector, tmp_sec; | |
750 | int hash; | |
751 | int dd_idx; | |
ff00d3b4 | 752 | int inc_empty_inactive_list_flag; |
59fc630b | 753 | |
59fc630b | 754 | /* Don't cross chunks, so stripe pd_idx/qd_idx is the same */ |
755 | tmp_sec = sh->sector; | |
756 | if (!sector_div(tmp_sec, conf->chunk_sectors)) | |
757 | return; | |
758 | head_sector = sh->sector - STRIPE_SECTORS; | |
759 | ||
760 | hash = stripe_hash_locks_hash(head_sector); | |
761 | spin_lock_irq(conf->hash_locks + hash); | |
762 | head = __find_stripe(conf, head_sector, conf->generation); | |
763 | if (head && !atomic_inc_not_zero(&head->count)) { | |
764 | spin_lock(&conf->device_lock); | |
765 | if (!atomic_read(&head->count)) { | |
766 | if (!test_bit(STRIPE_HANDLE, &head->state)) | |
767 | atomic_inc(&conf->active_stripes); | |
768 | BUG_ON(list_empty(&head->lru) && | |
769 | !test_bit(STRIPE_EXPANDING, &head->state)); | |
ff00d3b4 ZL |
770 | inc_empty_inactive_list_flag = 0; |
771 | if (!list_empty(conf->inactive_list + hash)) | |
772 | inc_empty_inactive_list_flag = 1; | |
59fc630b | 773 | list_del_init(&head->lru); |
ff00d3b4 ZL |
774 | if (list_empty(conf->inactive_list + hash) && inc_empty_inactive_list_flag) |
775 | atomic_inc(&conf->empty_inactive_list_nr); | |
59fc630b | 776 | if (head->group) { |
777 | head->group->stripes_cnt--; | |
778 | head->group = NULL; | |
779 | } | |
780 | } | |
781 | atomic_inc(&head->count); | |
782 | spin_unlock(&conf->device_lock); | |
783 | } | |
784 | spin_unlock_irq(conf->hash_locks + hash); | |
785 | ||
786 | if (!head) | |
787 | return; | |
788 | if (!stripe_can_batch(head)) | |
789 | goto out; | |
790 | ||
791 | lock_two_stripes(head, sh); | |
792 | /* clear_batch_ready clear the flag */ | |
793 | if (!stripe_can_batch(head) || !stripe_can_batch(sh)) | |
794 | goto unlock_out; | |
795 | ||
796 | if (sh->batch_head) | |
797 | goto unlock_out; | |
798 | ||
799 | dd_idx = 0; | |
800 | while (dd_idx == sh->pd_idx || dd_idx == sh->qd_idx) | |
801 | dd_idx++; | |
1eff9d32 | 802 | if (head->dev[dd_idx].towrite->bi_opf != sh->dev[dd_idx].towrite->bi_opf || |
796a5cf0 | 803 | bio_op(head->dev[dd_idx].towrite) != bio_op(sh->dev[dd_idx].towrite)) |
59fc630b | 804 | goto unlock_out; |
805 | ||
806 | if (head->batch_head) { | |
807 | spin_lock(&head->batch_head->batch_lock); | |
808 | /* This batch list is already running */ | |
809 | if (!stripe_can_batch(head)) { | |
810 | spin_unlock(&head->batch_head->batch_lock); | |
811 | goto unlock_out; | |
812 | } | |
3664847d SL |
813 | /* |
814 | * We must assign batch_head of this stripe within the | |
815 | * batch_lock, otherwise clear_batch_ready of batch head | |
816 | * stripe could clear BATCH_READY bit of this stripe and | |
817 | * this stripe->batch_head doesn't get assigned, which | |
818 | * could confuse clear_batch_ready for this stripe | |
819 | */ | |
820 | sh->batch_head = head->batch_head; | |
59fc630b | 821 | |
822 | /* | |
823 | * at this point, head's BATCH_READY could be cleared, but we | |
824 | * can still add the stripe to batch list | |
825 | */ | |
826 | list_add(&sh->batch_list, &head->batch_list); | |
827 | spin_unlock(&head->batch_head->batch_lock); | |
59fc630b | 828 | } else { |
829 | head->batch_head = head; | |
830 | sh->batch_head = head->batch_head; | |
831 | spin_lock(&head->batch_lock); | |
832 | list_add_tail(&sh->batch_list, &head->batch_list); | |
833 | spin_unlock(&head->batch_lock); | |
834 | } | |
835 | ||
836 | if (test_and_clear_bit(STRIPE_PREREAD_ACTIVE, &sh->state)) | |
837 | if (atomic_dec_return(&conf->preread_active_stripes) | |
838 | < IO_THRESHOLD) | |
839 | md_wakeup_thread(conf->mddev->thread); | |
840 | ||
2b6b2457 N |
841 | if (test_and_clear_bit(STRIPE_BIT_DELAY, &sh->state)) { |
842 | int seq = sh->bm_seq; | |
843 | if (test_bit(STRIPE_BIT_DELAY, &sh->batch_head->state) && | |
844 | sh->batch_head->bm_seq > seq) | |
845 | seq = sh->batch_head->bm_seq; | |
846 | set_bit(STRIPE_BIT_DELAY, &sh->batch_head->state); | |
847 | sh->batch_head->bm_seq = seq; | |
848 | } | |
849 | ||
59fc630b | 850 | atomic_inc(&sh->count); |
851 | unlock_out: | |
852 | unlock_two_stripes(head, sh); | |
853 | out: | |
6d036f7d | 854 | raid5_release_stripe(head); |
59fc630b | 855 | } |
856 | ||
05616be5 N |
857 | /* Determine if 'data_offset' or 'new_data_offset' should be used |
858 | * in this stripe_head. | |
859 | */ | |
860 | static int use_new_offset(struct r5conf *conf, struct stripe_head *sh) | |
861 | { | |
862 | sector_t progress = conf->reshape_progress; | |
863 | /* Need a memory barrier to make sure we see the value | |
864 | * of conf->generation, or ->data_offset that was set before | |
865 | * reshape_progress was updated. | |
866 | */ | |
867 | smp_rmb(); | |
868 | if (progress == MaxSector) | |
869 | return 0; | |
870 | if (sh->generation == conf->generation - 1) | |
871 | return 0; | |
872 | /* We are in a reshape, and this is a new-generation stripe, | |
873 | * so use new_data_offset. | |
874 | */ | |
875 | return 1; | |
876 | } | |
877 | ||
aaf9f12e | 878 | static void dispatch_bio_list(struct bio_list *tmp) |
765d704d | 879 | { |
765d704d SL |
880 | struct bio *bio; |
881 | ||
aaf9f12e SL |
882 | while ((bio = bio_list_pop(tmp))) |
883 | generic_make_request(bio); | |
884 | } | |
885 | ||
886 | static int cmp_stripe(void *priv, struct list_head *a, struct list_head *b) | |
887 | { | |
888 | const struct r5pending_data *da = list_entry(a, | |
889 | struct r5pending_data, sibling); | |
890 | const struct r5pending_data *db = list_entry(b, | |
891 | struct r5pending_data, sibling); | |
892 | if (da->sector > db->sector) | |
893 | return 1; | |
894 | if (da->sector < db->sector) | |
895 | return -1; | |
896 | return 0; | |
897 | } | |
898 | ||
899 | static void dispatch_defer_bios(struct r5conf *conf, int target, | |
900 | struct bio_list *list) | |
901 | { | |
902 | struct r5pending_data *data; | |
903 | struct list_head *first, *next = NULL; | |
904 | int cnt = 0; | |
905 | ||
906 | if (conf->pending_data_cnt == 0) | |
907 | return; | |
908 | ||
909 | list_sort(NULL, &conf->pending_list, cmp_stripe); | |
910 | ||
911 | first = conf->pending_list.next; | |
912 | ||
913 | /* temporarily move the head */ | |
914 | if (conf->next_pending_data) | |
915 | list_move_tail(&conf->pending_list, | |
916 | &conf->next_pending_data->sibling); | |
917 | ||
918 | while (!list_empty(&conf->pending_list)) { | |
919 | data = list_first_entry(&conf->pending_list, | |
920 | struct r5pending_data, sibling); | |
921 | if (&data->sibling == first) | |
922 | first = data->sibling.next; | |
923 | next = data->sibling.next; | |
924 | ||
925 | bio_list_merge(list, &data->bios); | |
926 | list_move(&data->sibling, &conf->free_list); | |
927 | cnt++; | |
928 | if (cnt >= target) | |
929 | break; | |
930 | } | |
931 | conf->pending_data_cnt -= cnt; | |
932 | BUG_ON(conf->pending_data_cnt < 0 || cnt < target); | |
933 | ||
934 | if (next != &conf->pending_list) | |
935 | conf->next_pending_data = list_entry(next, | |
936 | struct r5pending_data, sibling); | |
937 | else | |
938 | conf->next_pending_data = NULL; | |
939 | /* list isn't empty */ | |
940 | if (first != &conf->pending_list) | |
941 | list_move_tail(&conf->pending_list, first); | |
942 | } | |
943 | ||
944 | static void flush_deferred_bios(struct r5conf *conf) | |
945 | { | |
946 | struct bio_list tmp = BIO_EMPTY_LIST; | |
947 | ||
948 | if (conf->pending_data_cnt == 0) | |
765d704d SL |
949 | return; |
950 | ||
765d704d | 951 | spin_lock(&conf->pending_bios_lock); |
aaf9f12e SL |
952 | dispatch_defer_bios(conf, conf->pending_data_cnt, &tmp); |
953 | BUG_ON(conf->pending_data_cnt != 0); | |
765d704d SL |
954 | spin_unlock(&conf->pending_bios_lock); |
955 | ||
aaf9f12e | 956 | dispatch_bio_list(&tmp); |
765d704d SL |
957 | } |
958 | ||
aaf9f12e SL |
959 | static void defer_issue_bios(struct r5conf *conf, sector_t sector, |
960 | struct bio_list *bios) | |
765d704d | 961 | { |
aaf9f12e SL |
962 | struct bio_list tmp = BIO_EMPTY_LIST; |
963 | struct r5pending_data *ent; | |
964 | ||
765d704d | 965 | spin_lock(&conf->pending_bios_lock); |
aaf9f12e SL |
966 | ent = list_first_entry(&conf->free_list, struct r5pending_data, |
967 | sibling); | |
968 | list_move_tail(&ent->sibling, &conf->pending_list); | |
969 | ent->sector = sector; | |
970 | bio_list_init(&ent->bios); | |
971 | bio_list_merge(&ent->bios, bios); | |
972 | conf->pending_data_cnt++; | |
973 | if (conf->pending_data_cnt >= PENDING_IO_MAX) | |
974 | dispatch_defer_bios(conf, PENDING_IO_ONE_FLUSH, &tmp); | |
975 | ||
765d704d | 976 | spin_unlock(&conf->pending_bios_lock); |
aaf9f12e SL |
977 | |
978 | dispatch_bio_list(&tmp); | |
765d704d SL |
979 | } |
980 | ||
6712ecf8 | 981 | static void |
4246a0b6 | 982 | raid5_end_read_request(struct bio *bi); |
6712ecf8 | 983 | static void |
4246a0b6 | 984 | raid5_end_write_request(struct bio *bi); |
91c00924 | 985 | |
c4e5ac0a | 986 | static void ops_run_io(struct stripe_head *sh, struct stripe_head_state *s) |
91c00924 | 987 | { |
d1688a6d | 988 | struct r5conf *conf = sh->raid_conf; |
91c00924 | 989 | int i, disks = sh->disks; |
59fc630b | 990 | struct stripe_head *head_sh = sh; |
aaf9f12e SL |
991 | struct bio_list pending_bios = BIO_EMPTY_LIST; |
992 | bool should_defer; | |
91c00924 DW |
993 | |
994 | might_sleep(); | |
995 | ||
ff875738 AP |
996 | if (log_stripe(sh, s) == 0) |
997 | return; | |
1e6d690b | 998 | |
aaf9f12e | 999 | should_defer = conf->batch_bio_dispatch && conf->group_cnt; |
1e6d690b | 1000 | |
91c00924 | 1001 | for (i = disks; i--; ) { |
796a5cf0 | 1002 | int op, op_flags = 0; |
9a3e1101 | 1003 | int replace_only = 0; |
977df362 N |
1004 | struct bio *bi, *rbi; |
1005 | struct md_rdev *rdev, *rrdev = NULL; | |
59fc630b | 1006 | |
1007 | sh = head_sh; | |
e9c7469b | 1008 | if (test_and_clear_bit(R5_Wantwrite, &sh->dev[i].flags)) { |
796a5cf0 | 1009 | op = REQ_OP_WRITE; |
e9c7469b | 1010 | if (test_and_clear_bit(R5_WantFUA, &sh->dev[i].flags)) |
70fd7614 | 1011 | op_flags = REQ_FUA; |
9e444768 | 1012 | if (test_bit(R5_Discard, &sh->dev[i].flags)) |
796a5cf0 | 1013 | op = REQ_OP_DISCARD; |
e9c7469b | 1014 | } else if (test_and_clear_bit(R5_Wantread, &sh->dev[i].flags)) |
796a5cf0 | 1015 | op = REQ_OP_READ; |
9a3e1101 N |
1016 | else if (test_and_clear_bit(R5_WantReplace, |
1017 | &sh->dev[i].flags)) { | |
796a5cf0 | 1018 | op = REQ_OP_WRITE; |
9a3e1101 N |
1019 | replace_only = 1; |
1020 | } else | |
91c00924 | 1021 | continue; |
bc0934f0 | 1022 | if (test_and_clear_bit(R5_SyncIO, &sh->dev[i].flags)) |
796a5cf0 | 1023 | op_flags |= REQ_SYNC; |
91c00924 | 1024 | |
59fc630b | 1025 | again: |
91c00924 | 1026 | bi = &sh->dev[i].req; |
977df362 | 1027 | rbi = &sh->dev[i].rreq; /* For writing to replacement */ |
91c00924 | 1028 | |
91c00924 | 1029 | rcu_read_lock(); |
9a3e1101 | 1030 | rrdev = rcu_dereference(conf->disks[i].replacement); |
dd054fce N |
1031 | smp_mb(); /* Ensure that if rrdev is NULL, rdev won't be */ |
1032 | rdev = rcu_dereference(conf->disks[i].rdev); | |
1033 | if (!rdev) { | |
1034 | rdev = rrdev; | |
1035 | rrdev = NULL; | |
1036 | } | |
796a5cf0 | 1037 | if (op_is_write(op)) { |
9a3e1101 N |
1038 | if (replace_only) |
1039 | rdev = NULL; | |
dd054fce N |
1040 | if (rdev == rrdev) |
1041 | /* We raced and saw duplicates */ | |
1042 | rrdev = NULL; | |
9a3e1101 | 1043 | } else { |
59fc630b | 1044 | if (test_bit(R5_ReadRepl, &head_sh->dev[i].flags) && rrdev) |
9a3e1101 N |
1045 | rdev = rrdev; |
1046 | rrdev = NULL; | |
1047 | } | |
977df362 | 1048 | |
91c00924 DW |
1049 | if (rdev && test_bit(Faulty, &rdev->flags)) |
1050 | rdev = NULL; | |
1051 | if (rdev) | |
1052 | atomic_inc(&rdev->nr_pending); | |
977df362 N |
1053 | if (rrdev && test_bit(Faulty, &rrdev->flags)) |
1054 | rrdev = NULL; | |
1055 | if (rrdev) | |
1056 | atomic_inc(&rrdev->nr_pending); | |
91c00924 DW |
1057 | rcu_read_unlock(); |
1058 | ||
73e92e51 | 1059 | /* We have already checked bad blocks for reads. Now |
977df362 N |
1060 | * need to check for writes. We never accept write errors |
1061 | * on the replacement, so we don't to check rrdev. | |
73e92e51 | 1062 | */ |
796a5cf0 | 1063 | while (op_is_write(op) && rdev && |
73e92e51 N |
1064 | test_bit(WriteErrorSeen, &rdev->flags)) { |
1065 | sector_t first_bad; | |
1066 | int bad_sectors; | |
1067 | int bad = is_badblock(rdev, sh->sector, STRIPE_SECTORS, | |
1068 | &first_bad, &bad_sectors); | |
1069 | if (!bad) | |
1070 | break; | |
1071 | ||
1072 | if (bad < 0) { | |
1073 | set_bit(BlockedBadBlocks, &rdev->flags); | |
1074 | if (!conf->mddev->external && | |
2953079c | 1075 | conf->mddev->sb_flags) { |
73e92e51 N |
1076 | /* It is very unlikely, but we might |
1077 | * still need to write out the | |
1078 | * bad block log - better give it | |
1079 | * a chance*/ | |
1080 | md_check_recovery(conf->mddev); | |
1081 | } | |
1850753d | 1082 | /* |
1083 | * Because md_wait_for_blocked_rdev | |
1084 | * will dec nr_pending, we must | |
1085 | * increment it first. | |
1086 | */ | |
1087 | atomic_inc(&rdev->nr_pending); | |
73e92e51 N |
1088 | md_wait_for_blocked_rdev(rdev, conf->mddev); |
1089 | } else { | |
1090 | /* Acknowledged bad block - skip the write */ | |
1091 | rdev_dec_pending(rdev, conf->mddev); | |
1092 | rdev = NULL; | |
1093 | } | |
1094 | } | |
1095 | ||
91c00924 | 1096 | if (rdev) { |
9a3e1101 N |
1097 | if (s->syncing || s->expanding || s->expanded |
1098 | || s->replacing) | |
91c00924 DW |
1099 | md_sync_acct(rdev->bdev, STRIPE_SECTORS); |
1100 | ||
2b7497f0 DW |
1101 | set_bit(STRIPE_IO_STARTED, &sh->state); |
1102 | ||
74d46992 | 1103 | bio_set_dev(bi, rdev->bdev); |
796a5cf0 MC |
1104 | bio_set_op_attrs(bi, op, op_flags); |
1105 | bi->bi_end_io = op_is_write(op) | |
2f6db2a7 KO |
1106 | ? raid5_end_write_request |
1107 | : raid5_end_read_request; | |
1108 | bi->bi_private = sh; | |
1109 | ||
6296b960 | 1110 | pr_debug("%s: for %llu schedule op %d on disc %d\n", |
e46b272b | 1111 | __func__, (unsigned long long)sh->sector, |
1eff9d32 | 1112 | bi->bi_opf, i); |
91c00924 | 1113 | atomic_inc(&sh->count); |
59fc630b | 1114 | if (sh != head_sh) |
1115 | atomic_inc(&head_sh->count); | |
05616be5 | 1116 | if (use_new_offset(conf, sh)) |
4f024f37 | 1117 | bi->bi_iter.bi_sector = (sh->sector |
05616be5 N |
1118 | + rdev->new_data_offset); |
1119 | else | |
4f024f37 | 1120 | bi->bi_iter.bi_sector = (sh->sector |
05616be5 | 1121 | + rdev->data_offset); |
59fc630b | 1122 | if (test_bit(R5_ReadNoMerge, &head_sh->dev[i].flags)) |
1eff9d32 | 1123 | bi->bi_opf |= REQ_NOMERGE; |
3f9e7c14 | 1124 | |
d592a996 SL |
1125 | if (test_bit(R5_SkipCopy, &sh->dev[i].flags)) |
1126 | WARN_ON(test_bit(R5_UPTODATE, &sh->dev[i].flags)); | |
86aa1397 SL |
1127 | |
1128 | if (!op_is_write(op) && | |
1129 | test_bit(R5_InJournal, &sh->dev[i].flags)) | |
1130 | /* | |
1131 | * issuing read for a page in journal, this | |
1132 | * must be preparing for prexor in rmw; read | |
1133 | * the data into orig_page | |
1134 | */ | |
1135 | sh->dev[i].vec.bv_page = sh->dev[i].orig_page; | |
1136 | else | |
1137 | sh->dev[i].vec.bv_page = sh->dev[i].page; | |
4997b72e | 1138 | bi->bi_vcnt = 1; |
91c00924 DW |
1139 | bi->bi_io_vec[0].bv_len = STRIPE_SIZE; |
1140 | bi->bi_io_vec[0].bv_offset = 0; | |
4f024f37 | 1141 | bi->bi_iter.bi_size = STRIPE_SIZE; |
37c61ff3 SL |
1142 | /* |
1143 | * If this is discard request, set bi_vcnt 0. We don't | |
1144 | * want to confuse SCSI because SCSI will replace payload | |
1145 | */ | |
796a5cf0 | 1146 | if (op == REQ_OP_DISCARD) |
37c61ff3 | 1147 | bi->bi_vcnt = 0; |
977df362 N |
1148 | if (rrdev) |
1149 | set_bit(R5_DOUBLE_LOCKED, &sh->dev[i].flags); | |
e3620a3a JB |
1150 | |
1151 | if (conf->mddev->gendisk) | |
74d46992 | 1152 | trace_block_bio_remap(bi->bi_disk->queue, |
e3620a3a JB |
1153 | bi, disk_devt(conf->mddev->gendisk), |
1154 | sh->dev[i].sector); | |
aaf9f12e SL |
1155 | if (should_defer && op_is_write(op)) |
1156 | bio_list_add(&pending_bios, bi); | |
1157 | else | |
1158 | generic_make_request(bi); | |
977df362 N |
1159 | } |
1160 | if (rrdev) { | |
9a3e1101 N |
1161 | if (s->syncing || s->expanding || s->expanded |
1162 | || s->replacing) | |
977df362 N |
1163 | md_sync_acct(rrdev->bdev, STRIPE_SECTORS); |
1164 | ||
1165 | set_bit(STRIPE_IO_STARTED, &sh->state); | |
1166 | ||
74d46992 | 1167 | bio_set_dev(rbi, rrdev->bdev); |
796a5cf0 MC |
1168 | bio_set_op_attrs(rbi, op, op_flags); |
1169 | BUG_ON(!op_is_write(op)); | |
2f6db2a7 KO |
1170 | rbi->bi_end_io = raid5_end_write_request; |
1171 | rbi->bi_private = sh; | |
1172 | ||
6296b960 | 1173 | pr_debug("%s: for %llu schedule op %d on " |
977df362 N |
1174 | "replacement disc %d\n", |
1175 | __func__, (unsigned long long)sh->sector, | |
1eff9d32 | 1176 | rbi->bi_opf, i); |
977df362 | 1177 | atomic_inc(&sh->count); |
59fc630b | 1178 | if (sh != head_sh) |
1179 | atomic_inc(&head_sh->count); | |
05616be5 | 1180 | if (use_new_offset(conf, sh)) |
4f024f37 | 1181 | rbi->bi_iter.bi_sector = (sh->sector |
05616be5 N |
1182 | + rrdev->new_data_offset); |
1183 | else | |
4f024f37 | 1184 | rbi->bi_iter.bi_sector = (sh->sector |
05616be5 | 1185 | + rrdev->data_offset); |
d592a996 SL |
1186 | if (test_bit(R5_SkipCopy, &sh->dev[i].flags)) |
1187 | WARN_ON(test_bit(R5_UPTODATE, &sh->dev[i].flags)); | |
1188 | sh->dev[i].rvec.bv_page = sh->dev[i].page; | |
4997b72e | 1189 | rbi->bi_vcnt = 1; |
977df362 N |
1190 | rbi->bi_io_vec[0].bv_len = STRIPE_SIZE; |
1191 | rbi->bi_io_vec[0].bv_offset = 0; | |
4f024f37 | 1192 | rbi->bi_iter.bi_size = STRIPE_SIZE; |
37c61ff3 SL |
1193 | /* |
1194 | * If this is discard request, set bi_vcnt 0. We don't | |
1195 | * want to confuse SCSI because SCSI will replace payload | |
1196 | */ | |
796a5cf0 | 1197 | if (op == REQ_OP_DISCARD) |
37c61ff3 | 1198 | rbi->bi_vcnt = 0; |
e3620a3a | 1199 | if (conf->mddev->gendisk) |
74d46992 | 1200 | trace_block_bio_remap(rbi->bi_disk->queue, |
e3620a3a JB |
1201 | rbi, disk_devt(conf->mddev->gendisk), |
1202 | sh->dev[i].sector); | |
aaf9f12e SL |
1203 | if (should_defer && op_is_write(op)) |
1204 | bio_list_add(&pending_bios, rbi); | |
1205 | else | |
1206 | generic_make_request(rbi); | |
977df362 N |
1207 | } |
1208 | if (!rdev && !rrdev) { | |
796a5cf0 | 1209 | if (op_is_write(op)) |
91c00924 | 1210 | set_bit(STRIPE_DEGRADED, &sh->state); |
6296b960 | 1211 | pr_debug("skip op %d on disc %d for sector %llu\n", |
1eff9d32 | 1212 | bi->bi_opf, i, (unsigned long long)sh->sector); |
91c00924 DW |
1213 | clear_bit(R5_LOCKED, &sh->dev[i].flags); |
1214 | set_bit(STRIPE_HANDLE, &sh->state); | |
1215 | } | |
59fc630b | 1216 | |
1217 | if (!head_sh->batch_head) | |
1218 | continue; | |
1219 | sh = list_first_entry(&sh->batch_list, struct stripe_head, | |
1220 | batch_list); | |
1221 | if (sh != head_sh) | |
1222 | goto again; | |
91c00924 | 1223 | } |
aaf9f12e SL |
1224 | |
1225 | if (should_defer && !bio_list_empty(&pending_bios)) | |
1226 | defer_issue_bios(conf, head_sh->sector, &pending_bios); | |
91c00924 DW |
1227 | } |
1228 | ||
1229 | static struct dma_async_tx_descriptor * | |
d592a996 SL |
1230 | async_copy_data(int frombio, struct bio *bio, struct page **page, |
1231 | sector_t sector, struct dma_async_tx_descriptor *tx, | |
1e6d690b | 1232 | struct stripe_head *sh, int no_skipcopy) |
91c00924 | 1233 | { |
7988613b KO |
1234 | struct bio_vec bvl; |
1235 | struct bvec_iter iter; | |
91c00924 | 1236 | struct page *bio_page; |
91c00924 | 1237 | int page_offset; |
a08abd8c | 1238 | struct async_submit_ctl submit; |
0403e382 | 1239 | enum async_tx_flags flags = 0; |
91c00924 | 1240 | |
4f024f37 KO |
1241 | if (bio->bi_iter.bi_sector >= sector) |
1242 | page_offset = (signed)(bio->bi_iter.bi_sector - sector) * 512; | |
91c00924 | 1243 | else |
4f024f37 | 1244 | page_offset = (signed)(sector - bio->bi_iter.bi_sector) * -512; |
a08abd8c | 1245 | |
0403e382 DW |
1246 | if (frombio) |
1247 | flags |= ASYNC_TX_FENCE; | |
1248 | init_async_submit(&submit, flags, tx, NULL, NULL, NULL); | |
1249 | ||
7988613b KO |
1250 | bio_for_each_segment(bvl, bio, iter) { |
1251 | int len = bvl.bv_len; | |
91c00924 DW |
1252 | int clen; |
1253 | int b_offset = 0; | |
1254 | ||
1255 | if (page_offset < 0) { | |
1256 | b_offset = -page_offset; | |
1257 | page_offset += b_offset; | |
1258 | len -= b_offset; | |
1259 | } | |
1260 | ||
1261 | if (len > 0 && page_offset + len > STRIPE_SIZE) | |
1262 | clen = STRIPE_SIZE - page_offset; | |
1263 | else | |
1264 | clen = len; | |
1265 | ||
1266 | if (clen > 0) { | |
7988613b KO |
1267 | b_offset += bvl.bv_offset; |
1268 | bio_page = bvl.bv_page; | |
d592a996 SL |
1269 | if (frombio) { |
1270 | if (sh->raid_conf->skip_copy && | |
1271 | b_offset == 0 && page_offset == 0 && | |
1e6d690b SL |
1272 | clen == STRIPE_SIZE && |
1273 | !no_skipcopy) | |
d592a996 SL |
1274 | *page = bio_page; |
1275 | else | |
1276 | tx = async_memcpy(*page, bio_page, page_offset, | |
a08abd8c | 1277 | b_offset, clen, &submit); |
d592a996 SL |
1278 | } else |
1279 | tx = async_memcpy(bio_page, *page, b_offset, | |
a08abd8c | 1280 | page_offset, clen, &submit); |
91c00924 | 1281 | } |
a08abd8c DW |
1282 | /* chain the operations */ |
1283 | submit.depend_tx = tx; | |
1284 | ||
91c00924 DW |
1285 | if (clen < len) /* hit end of page */ |
1286 | break; | |
1287 | page_offset += len; | |
1288 | } | |
1289 | ||
1290 | return tx; | |
1291 | } | |
1292 | ||
1293 | static void ops_complete_biofill(void *stripe_head_ref) | |
1294 | { | |
1295 | struct stripe_head *sh = stripe_head_ref; | |
e4d84909 | 1296 | int i; |
91c00924 | 1297 | |
e46b272b | 1298 | pr_debug("%s: stripe %llu\n", __func__, |
91c00924 DW |
1299 | (unsigned long long)sh->sector); |
1300 | ||
1301 | /* clear completed biofills */ | |
1302 | for (i = sh->disks; i--; ) { | |
1303 | struct r5dev *dev = &sh->dev[i]; | |
91c00924 DW |
1304 | |
1305 | /* acknowledge completion of a biofill operation */ | |
e4d84909 DW |
1306 | /* and check if we need to reply to a read request, |
1307 | * new R5_Wantfill requests are held off until | |
83de75cc | 1308 | * !STRIPE_BIOFILL_RUN |
e4d84909 DW |
1309 | */ |
1310 | if (test_and_clear_bit(R5_Wantfill, &dev->flags)) { | |
91c00924 | 1311 | struct bio *rbi, *rbi2; |
91c00924 | 1312 | |
91c00924 DW |
1313 | BUG_ON(!dev->read); |
1314 | rbi = dev->read; | |
1315 | dev->read = NULL; | |
4f024f37 | 1316 | while (rbi && rbi->bi_iter.bi_sector < |
91c00924 DW |
1317 | dev->sector + STRIPE_SECTORS) { |
1318 | rbi2 = r5_next_bio(rbi, dev->sector); | |
016c76ac | 1319 | bio_endio(rbi); |
91c00924 DW |
1320 | rbi = rbi2; |
1321 | } | |
1322 | } | |
1323 | } | |
83de75cc | 1324 | clear_bit(STRIPE_BIOFILL_RUN, &sh->state); |
91c00924 | 1325 | |
e4d84909 | 1326 | set_bit(STRIPE_HANDLE, &sh->state); |
6d036f7d | 1327 | raid5_release_stripe(sh); |
91c00924 DW |
1328 | } |
1329 | ||
1330 | static void ops_run_biofill(struct stripe_head *sh) | |
1331 | { | |
1332 | struct dma_async_tx_descriptor *tx = NULL; | |
a08abd8c | 1333 | struct async_submit_ctl submit; |
91c00924 DW |
1334 | int i; |
1335 | ||
59fc630b | 1336 | BUG_ON(sh->batch_head); |
e46b272b | 1337 | pr_debug("%s: stripe %llu\n", __func__, |
91c00924 DW |
1338 | (unsigned long long)sh->sector); |
1339 | ||
1340 | for (i = sh->disks; i--; ) { | |
1341 | struct r5dev *dev = &sh->dev[i]; | |
1342 | if (test_bit(R5_Wantfill, &dev->flags)) { | |
1343 | struct bio *rbi; | |
b17459c0 | 1344 | spin_lock_irq(&sh->stripe_lock); |
91c00924 DW |
1345 | dev->read = rbi = dev->toread; |
1346 | dev->toread = NULL; | |
b17459c0 | 1347 | spin_unlock_irq(&sh->stripe_lock); |
4f024f37 | 1348 | while (rbi && rbi->bi_iter.bi_sector < |
91c00924 | 1349 | dev->sector + STRIPE_SECTORS) { |
d592a996 | 1350 | tx = async_copy_data(0, rbi, &dev->page, |
1e6d690b | 1351 | dev->sector, tx, sh, 0); |
91c00924 DW |
1352 | rbi = r5_next_bio(rbi, dev->sector); |
1353 | } | |
1354 | } | |
1355 | } | |
1356 | ||
1357 | atomic_inc(&sh->count); | |
a08abd8c DW |
1358 | init_async_submit(&submit, ASYNC_TX_ACK, tx, ops_complete_biofill, sh, NULL); |
1359 | async_trigger_callback(&submit); | |
91c00924 DW |
1360 | } |
1361 | ||
4e7d2c0a | 1362 | static void mark_target_uptodate(struct stripe_head *sh, int target) |
91c00924 | 1363 | { |
4e7d2c0a | 1364 | struct r5dev *tgt; |
91c00924 | 1365 | |
4e7d2c0a DW |
1366 | if (target < 0) |
1367 | return; | |
91c00924 | 1368 | |
4e7d2c0a | 1369 | tgt = &sh->dev[target]; |
91c00924 DW |
1370 | set_bit(R5_UPTODATE, &tgt->flags); |
1371 | BUG_ON(!test_bit(R5_Wantcompute, &tgt->flags)); | |
1372 | clear_bit(R5_Wantcompute, &tgt->flags); | |
4e7d2c0a DW |
1373 | } |
1374 | ||
ac6b53b6 | 1375 | static void ops_complete_compute(void *stripe_head_ref) |
91c00924 DW |
1376 | { |
1377 | struct stripe_head *sh = stripe_head_ref; | |
91c00924 | 1378 | |
e46b272b | 1379 | pr_debug("%s: stripe %llu\n", __func__, |
91c00924 DW |
1380 | (unsigned long long)sh->sector); |
1381 | ||
ac6b53b6 | 1382 | /* mark the computed target(s) as uptodate */ |
4e7d2c0a | 1383 | mark_target_uptodate(sh, sh->ops.target); |
ac6b53b6 | 1384 | mark_target_uptodate(sh, sh->ops.target2); |
4e7d2c0a | 1385 | |
ecc65c9b DW |
1386 | clear_bit(STRIPE_COMPUTE_RUN, &sh->state); |
1387 | if (sh->check_state == check_state_compute_run) | |
1388 | sh->check_state = check_state_compute_result; | |
91c00924 | 1389 | set_bit(STRIPE_HANDLE, &sh->state); |
6d036f7d | 1390 | raid5_release_stripe(sh); |
91c00924 DW |
1391 | } |
1392 | ||
d6f38f31 DW |
1393 | /* return a pointer to the address conversion region of the scribble buffer */ |
1394 | static addr_conv_t *to_addr_conv(struct stripe_head *sh, | |
46d5b785 | 1395 | struct raid5_percpu *percpu, int i) |
d6f38f31 | 1396 | { |
46d5b785 | 1397 | void *addr; |
1398 | ||
1399 | addr = flex_array_get(percpu->scribble, i); | |
1400 | return addr + sizeof(struct page *) * (sh->disks + 2); | |
1401 | } | |
1402 | ||
1403 | /* return a pointer to the address conversion region of the scribble buffer */ | |
1404 | static struct page **to_addr_page(struct raid5_percpu *percpu, int i) | |
1405 | { | |
1406 | void *addr; | |
1407 | ||
1408 | addr = flex_array_get(percpu->scribble, i); | |
1409 | return addr; | |
d6f38f31 DW |
1410 | } |
1411 | ||
1412 | static struct dma_async_tx_descriptor * | |
1413 | ops_run_compute5(struct stripe_head *sh, struct raid5_percpu *percpu) | |
91c00924 | 1414 | { |
91c00924 | 1415 | int disks = sh->disks; |
46d5b785 | 1416 | struct page **xor_srcs = to_addr_page(percpu, 0); |
91c00924 DW |
1417 | int target = sh->ops.target; |
1418 | struct r5dev *tgt = &sh->dev[target]; | |
1419 | struct page *xor_dest = tgt->page; | |
1420 | int count = 0; | |
1421 | struct dma_async_tx_descriptor *tx; | |
a08abd8c | 1422 | struct async_submit_ctl submit; |
91c00924 DW |
1423 | int i; |
1424 | ||
59fc630b | 1425 | BUG_ON(sh->batch_head); |
1426 | ||
91c00924 | 1427 | pr_debug("%s: stripe %llu block: %d\n", |
e46b272b | 1428 | __func__, (unsigned long long)sh->sector, target); |
91c00924 DW |
1429 | BUG_ON(!test_bit(R5_Wantcompute, &tgt->flags)); |
1430 | ||
1431 | for (i = disks; i--; ) | |
1432 | if (i != target) | |
1433 | xor_srcs[count++] = sh->dev[i].page; | |
1434 | ||
1435 | atomic_inc(&sh->count); | |
1436 | ||
0403e382 | 1437 | init_async_submit(&submit, ASYNC_TX_FENCE|ASYNC_TX_XOR_ZERO_DST, NULL, |
46d5b785 | 1438 | ops_complete_compute, sh, to_addr_conv(sh, percpu, 0)); |
91c00924 | 1439 | if (unlikely(count == 1)) |
a08abd8c | 1440 | tx = async_memcpy(xor_dest, xor_srcs[0], 0, 0, STRIPE_SIZE, &submit); |
91c00924 | 1441 | else |
a08abd8c | 1442 | tx = async_xor(xor_dest, xor_srcs, 0, count, STRIPE_SIZE, &submit); |
91c00924 | 1443 | |
91c00924 DW |
1444 | return tx; |
1445 | } | |
1446 | ||
ac6b53b6 DW |
1447 | /* set_syndrome_sources - populate source buffers for gen_syndrome |
1448 | * @srcs - (struct page *) array of size sh->disks | |
1449 | * @sh - stripe_head to parse | |
1450 | * | |
1451 | * Populates srcs in proper layout order for the stripe and returns the | |
1452 | * 'count' of sources to be used in a call to async_gen_syndrome. The P | |
1453 | * destination buffer is recorded in srcs[count] and the Q destination | |
1454 | * is recorded in srcs[count+1]]. | |
1455 | */ | |
584acdd4 MS |
1456 | static int set_syndrome_sources(struct page **srcs, |
1457 | struct stripe_head *sh, | |
1458 | int srctype) | |
ac6b53b6 DW |
1459 | { |
1460 | int disks = sh->disks; | |
1461 | int syndrome_disks = sh->ddf_layout ? disks : (disks - 2); | |
1462 | int d0_idx = raid6_d0(sh); | |
1463 | int count; | |
1464 | int i; | |
1465 | ||
1466 | for (i = 0; i < disks; i++) | |
5dd33c9a | 1467 | srcs[i] = NULL; |
ac6b53b6 DW |
1468 | |
1469 | count = 0; | |
1470 | i = d0_idx; | |
1471 | do { | |
1472 | int slot = raid6_idx_to_slot(i, sh, &count, syndrome_disks); | |
584acdd4 | 1473 | struct r5dev *dev = &sh->dev[i]; |
ac6b53b6 | 1474 | |
584acdd4 MS |
1475 | if (i == sh->qd_idx || i == sh->pd_idx || |
1476 | (srctype == SYNDROME_SRC_ALL) || | |
1477 | (srctype == SYNDROME_SRC_WANT_DRAIN && | |
1e6d690b SL |
1478 | (test_bit(R5_Wantdrain, &dev->flags) || |
1479 | test_bit(R5_InJournal, &dev->flags))) || | |
584acdd4 | 1480 | (srctype == SYNDROME_SRC_WRITTEN && |
0977762f SL |
1481 | (dev->written || |
1482 | test_bit(R5_InJournal, &dev->flags)))) { | |
1e6d690b SL |
1483 | if (test_bit(R5_InJournal, &dev->flags)) |
1484 | srcs[slot] = sh->dev[i].orig_page; | |
1485 | else | |
1486 | srcs[slot] = sh->dev[i].page; | |
1487 | } | |
ac6b53b6 DW |
1488 | i = raid6_next_disk(i, disks); |
1489 | } while (i != d0_idx); | |
ac6b53b6 | 1490 | |
e4424fee | 1491 | return syndrome_disks; |
ac6b53b6 DW |
1492 | } |
1493 | ||
1494 | static struct dma_async_tx_descriptor * | |
1495 | ops_run_compute6_1(struct stripe_head *sh, struct raid5_percpu *percpu) | |
1496 | { | |
1497 | int disks = sh->disks; | |
46d5b785 | 1498 | struct page **blocks = to_addr_page(percpu, 0); |
ac6b53b6 DW |
1499 | int target; |
1500 | int qd_idx = sh->qd_idx; | |
1501 | struct dma_async_tx_descriptor *tx; | |
1502 | struct async_submit_ctl submit; | |
1503 | struct r5dev *tgt; | |
1504 | struct page *dest; | |
1505 | int i; | |
1506 | int count; | |
1507 | ||
59fc630b | 1508 | BUG_ON(sh->batch_head); |
ac6b53b6 DW |
1509 | if (sh->ops.target < 0) |
1510 | target = sh->ops.target2; | |
1511 | else if (sh->ops.target2 < 0) | |
1512 | target = sh->ops.target; | |
91c00924 | 1513 | else |
ac6b53b6 DW |
1514 | /* we should only have one valid target */ |
1515 | BUG(); | |
1516 | BUG_ON(target < 0); | |
1517 | pr_debug("%s: stripe %llu block: %d\n", | |
1518 | __func__, (unsigned long long)sh->sector, target); | |
1519 | ||
1520 | tgt = &sh->dev[target]; | |
1521 | BUG_ON(!test_bit(R5_Wantcompute, &tgt->flags)); | |
1522 | dest = tgt->page; | |
1523 | ||
1524 | atomic_inc(&sh->count); | |
1525 | ||
1526 | if (target == qd_idx) { | |
584acdd4 | 1527 | count = set_syndrome_sources(blocks, sh, SYNDROME_SRC_ALL); |
ac6b53b6 DW |
1528 | blocks[count] = NULL; /* regenerating p is not necessary */ |
1529 | BUG_ON(blocks[count+1] != dest); /* q should already be set */ | |
0403e382 DW |
1530 | init_async_submit(&submit, ASYNC_TX_FENCE, NULL, |
1531 | ops_complete_compute, sh, | |
46d5b785 | 1532 | to_addr_conv(sh, percpu, 0)); |
ac6b53b6 DW |
1533 | tx = async_gen_syndrome(blocks, 0, count+2, STRIPE_SIZE, &submit); |
1534 | } else { | |
1535 | /* Compute any data- or p-drive using XOR */ | |
1536 | count = 0; | |
1537 | for (i = disks; i-- ; ) { | |
1538 | if (i == target || i == qd_idx) | |
1539 | continue; | |
1540 | blocks[count++] = sh->dev[i].page; | |
1541 | } | |
1542 | ||
0403e382 DW |
1543 | init_async_submit(&submit, ASYNC_TX_FENCE|ASYNC_TX_XOR_ZERO_DST, |
1544 | NULL, ops_complete_compute, sh, | |
46d5b785 | 1545 | to_addr_conv(sh, percpu, 0)); |
ac6b53b6 DW |
1546 | tx = async_xor(dest, blocks, 0, count, STRIPE_SIZE, &submit); |
1547 | } | |
91c00924 | 1548 | |
91c00924 DW |
1549 | return tx; |
1550 | } | |
1551 | ||
ac6b53b6 DW |
1552 | static struct dma_async_tx_descriptor * |
1553 | ops_run_compute6_2(struct stripe_head *sh, struct raid5_percpu *percpu) | |
1554 | { | |
1555 | int i, count, disks = sh->disks; | |
1556 | int syndrome_disks = sh->ddf_layout ? disks : disks-2; | |
1557 | int d0_idx = raid6_d0(sh); | |
1558 | int faila = -1, failb = -1; | |
1559 | int target = sh->ops.target; | |
1560 | int target2 = sh->ops.target2; | |
1561 | struct r5dev *tgt = &sh->dev[target]; | |
1562 | struct r5dev *tgt2 = &sh->dev[target2]; | |
1563 | struct dma_async_tx_descriptor *tx; | |
46d5b785 | 1564 | struct page **blocks = to_addr_page(percpu, 0); |
ac6b53b6 DW |
1565 | struct async_submit_ctl submit; |
1566 | ||
59fc630b | 1567 | BUG_ON(sh->batch_head); |
ac6b53b6 DW |
1568 | pr_debug("%s: stripe %llu block1: %d block2: %d\n", |
1569 | __func__, (unsigned long long)sh->sector, target, target2); | |
1570 | BUG_ON(target < 0 || target2 < 0); | |
1571 | BUG_ON(!test_bit(R5_Wantcompute, &tgt->flags)); | |
1572 | BUG_ON(!test_bit(R5_Wantcompute, &tgt2->flags)); | |
1573 | ||
6c910a78 | 1574 | /* we need to open-code set_syndrome_sources to handle the |
ac6b53b6 DW |
1575 | * slot number conversion for 'faila' and 'failb' |
1576 | */ | |
1577 | for (i = 0; i < disks ; i++) | |
5dd33c9a | 1578 | blocks[i] = NULL; |
ac6b53b6 DW |
1579 | count = 0; |
1580 | i = d0_idx; | |
1581 | do { | |
1582 | int slot = raid6_idx_to_slot(i, sh, &count, syndrome_disks); | |
1583 | ||
1584 | blocks[slot] = sh->dev[i].page; | |
1585 | ||
1586 | if (i == target) | |
1587 | faila = slot; | |
1588 | if (i == target2) | |
1589 | failb = slot; | |
1590 | i = raid6_next_disk(i, disks); | |
1591 | } while (i != d0_idx); | |
ac6b53b6 DW |
1592 | |
1593 | BUG_ON(faila == failb); | |
1594 | if (failb < faila) | |
1595 | swap(faila, failb); | |
1596 | pr_debug("%s: stripe: %llu faila: %d failb: %d\n", | |
1597 | __func__, (unsigned long long)sh->sector, faila, failb); | |
1598 | ||
1599 | atomic_inc(&sh->count); | |
1600 | ||
1601 | if (failb == syndrome_disks+1) { | |
1602 | /* Q disk is one of the missing disks */ | |
1603 | if (faila == syndrome_disks) { | |
1604 | /* Missing P+Q, just recompute */ | |
0403e382 DW |
1605 | init_async_submit(&submit, ASYNC_TX_FENCE, NULL, |
1606 | ops_complete_compute, sh, | |
46d5b785 | 1607 | to_addr_conv(sh, percpu, 0)); |
e4424fee | 1608 | return async_gen_syndrome(blocks, 0, syndrome_disks+2, |
ac6b53b6 DW |
1609 | STRIPE_SIZE, &submit); |
1610 | } else { | |
1611 | struct page *dest; | |
1612 | int data_target; | |
1613 | int qd_idx = sh->qd_idx; | |
1614 | ||
1615 | /* Missing D+Q: recompute D from P, then recompute Q */ | |
1616 | if (target == qd_idx) | |
1617 | data_target = target2; | |
1618 | else | |
1619 | data_target = target; | |
1620 | ||
1621 | count = 0; | |
1622 | for (i = disks; i-- ; ) { | |
1623 | if (i == data_target || i == qd_idx) | |
1624 | continue; | |
1625 | blocks[count++] = sh->dev[i].page; | |
1626 | } | |
1627 | dest = sh->dev[data_target].page; | |
0403e382 DW |
1628 | init_async_submit(&submit, |
1629 | ASYNC_TX_FENCE|ASYNC_TX_XOR_ZERO_DST, | |
1630 | NULL, NULL, NULL, | |
46d5b785 | 1631 | to_addr_conv(sh, percpu, 0)); |
ac6b53b6 DW |
1632 | tx = async_xor(dest, blocks, 0, count, STRIPE_SIZE, |
1633 | &submit); | |
1634 | ||
584acdd4 | 1635 | count = set_syndrome_sources(blocks, sh, SYNDROME_SRC_ALL); |
0403e382 DW |
1636 | init_async_submit(&submit, ASYNC_TX_FENCE, tx, |
1637 | ops_complete_compute, sh, | |
46d5b785 | 1638 | to_addr_conv(sh, percpu, 0)); |
ac6b53b6 DW |
1639 | return async_gen_syndrome(blocks, 0, count+2, |
1640 | STRIPE_SIZE, &submit); | |
1641 | } | |
ac6b53b6 | 1642 | } else { |
6c910a78 DW |
1643 | init_async_submit(&submit, ASYNC_TX_FENCE, NULL, |
1644 | ops_complete_compute, sh, | |
46d5b785 | 1645 | to_addr_conv(sh, percpu, 0)); |
6c910a78 DW |
1646 | if (failb == syndrome_disks) { |
1647 | /* We're missing D+P. */ | |
1648 | return async_raid6_datap_recov(syndrome_disks+2, | |
1649 | STRIPE_SIZE, faila, | |
1650 | blocks, &submit); | |
1651 | } else { | |
1652 | /* We're missing D+D. */ | |
1653 | return async_raid6_2data_recov(syndrome_disks+2, | |
1654 | STRIPE_SIZE, faila, failb, | |
1655 | blocks, &submit); | |
1656 | } | |
ac6b53b6 DW |
1657 | } |
1658 | } | |
1659 | ||
91c00924 DW |
1660 | static void ops_complete_prexor(void *stripe_head_ref) |
1661 | { | |
1662 | struct stripe_head *sh = stripe_head_ref; | |
1663 | ||
e46b272b | 1664 | pr_debug("%s: stripe %llu\n", __func__, |
91c00924 | 1665 | (unsigned long long)sh->sector); |
1e6d690b SL |
1666 | |
1667 | if (r5c_is_writeback(sh->raid_conf->log)) | |
1668 | /* | |
1669 | * raid5-cache write back uses orig_page during prexor. | |
1670 | * After prexor, it is time to free orig_page | |
1671 | */ | |
1672 | r5c_release_extra_page(sh); | |
91c00924 DW |
1673 | } |
1674 | ||
1675 | static struct dma_async_tx_descriptor * | |
584acdd4 MS |
1676 | ops_run_prexor5(struct stripe_head *sh, struct raid5_percpu *percpu, |
1677 | struct dma_async_tx_descriptor *tx) | |
91c00924 | 1678 | { |
91c00924 | 1679 | int disks = sh->disks; |
46d5b785 | 1680 | struct page **xor_srcs = to_addr_page(percpu, 0); |
91c00924 | 1681 | int count = 0, pd_idx = sh->pd_idx, i; |
a08abd8c | 1682 | struct async_submit_ctl submit; |
91c00924 DW |
1683 | |
1684 | /* existing parity data subtracted */ | |
1685 | struct page *xor_dest = xor_srcs[count++] = sh->dev[pd_idx].page; | |
1686 | ||
59fc630b | 1687 | BUG_ON(sh->batch_head); |
e46b272b | 1688 | pr_debug("%s: stripe %llu\n", __func__, |
91c00924 DW |
1689 | (unsigned long long)sh->sector); |
1690 | ||
1691 | for (i = disks; i--; ) { | |
1692 | struct r5dev *dev = &sh->dev[i]; | |
1693 | /* Only process blocks that are known to be uptodate */ | |
1e6d690b SL |
1694 | if (test_bit(R5_InJournal, &dev->flags)) |
1695 | xor_srcs[count++] = dev->orig_page; | |
1696 | else if (test_bit(R5_Wantdrain, &dev->flags)) | |
91c00924 DW |
1697 | xor_srcs[count++] = dev->page; |
1698 | } | |
1699 | ||
0403e382 | 1700 | init_async_submit(&submit, ASYNC_TX_FENCE|ASYNC_TX_XOR_DROP_DST, tx, |
46d5b785 | 1701 | ops_complete_prexor, sh, to_addr_conv(sh, percpu, 0)); |
a08abd8c | 1702 | tx = async_xor(xor_dest, xor_srcs, 0, count, STRIPE_SIZE, &submit); |
91c00924 DW |
1703 | |
1704 | return tx; | |
1705 | } | |
1706 | ||
584acdd4 MS |
1707 | static struct dma_async_tx_descriptor * |
1708 | ops_run_prexor6(struct stripe_head *sh, struct raid5_percpu *percpu, | |
1709 | struct dma_async_tx_descriptor *tx) | |
1710 | { | |
1711 | struct page **blocks = to_addr_page(percpu, 0); | |
1712 | int count; | |
1713 | struct async_submit_ctl submit; | |
1714 | ||
1715 | pr_debug("%s: stripe %llu\n", __func__, | |
1716 | (unsigned long long)sh->sector); | |
1717 | ||
1718 | count = set_syndrome_sources(blocks, sh, SYNDROME_SRC_WANT_DRAIN); | |
1719 | ||
1720 | init_async_submit(&submit, ASYNC_TX_FENCE|ASYNC_TX_PQ_XOR_DST, tx, | |
1721 | ops_complete_prexor, sh, to_addr_conv(sh, percpu, 0)); | |
1722 | tx = async_gen_syndrome(blocks, 0, count+2, STRIPE_SIZE, &submit); | |
1723 | ||
1724 | return tx; | |
1725 | } | |
1726 | ||
91c00924 | 1727 | static struct dma_async_tx_descriptor * |
d8ee0728 | 1728 | ops_run_biodrain(struct stripe_head *sh, struct dma_async_tx_descriptor *tx) |
91c00924 | 1729 | { |
1e6d690b | 1730 | struct r5conf *conf = sh->raid_conf; |
91c00924 | 1731 | int disks = sh->disks; |
d8ee0728 | 1732 | int i; |
59fc630b | 1733 | struct stripe_head *head_sh = sh; |
91c00924 | 1734 | |
e46b272b | 1735 | pr_debug("%s: stripe %llu\n", __func__, |
91c00924 DW |
1736 | (unsigned long long)sh->sector); |
1737 | ||
1738 | for (i = disks; i--; ) { | |
59fc630b | 1739 | struct r5dev *dev; |
91c00924 | 1740 | struct bio *chosen; |
91c00924 | 1741 | |
59fc630b | 1742 | sh = head_sh; |
1743 | if (test_and_clear_bit(R5_Wantdrain, &head_sh->dev[i].flags)) { | |
91c00924 DW |
1744 | struct bio *wbi; |
1745 | ||
59fc630b | 1746 | again: |
1747 | dev = &sh->dev[i]; | |
1e6d690b SL |
1748 | /* |
1749 | * clear R5_InJournal, so when rewriting a page in | |
1750 | * journal, it is not skipped by r5l_log_stripe() | |
1751 | */ | |
1752 | clear_bit(R5_InJournal, &dev->flags); | |
b17459c0 | 1753 | spin_lock_irq(&sh->stripe_lock); |
91c00924 DW |
1754 | chosen = dev->towrite; |
1755 | dev->towrite = NULL; | |
7a87f434 | 1756 | sh->overwrite_disks = 0; |
91c00924 DW |
1757 | BUG_ON(dev->written); |
1758 | wbi = dev->written = chosen; | |
b17459c0 | 1759 | spin_unlock_irq(&sh->stripe_lock); |
d592a996 | 1760 | WARN_ON(dev->page != dev->orig_page); |
91c00924 | 1761 | |
4f024f37 | 1762 | while (wbi && wbi->bi_iter.bi_sector < |
91c00924 | 1763 | dev->sector + STRIPE_SECTORS) { |
1eff9d32 | 1764 | if (wbi->bi_opf & REQ_FUA) |
e9c7469b | 1765 | set_bit(R5_WantFUA, &dev->flags); |
1eff9d32 | 1766 | if (wbi->bi_opf & REQ_SYNC) |
bc0934f0 | 1767 | set_bit(R5_SyncIO, &dev->flags); |
796a5cf0 | 1768 | if (bio_op(wbi) == REQ_OP_DISCARD) |
620125f2 | 1769 | set_bit(R5_Discard, &dev->flags); |
d592a996 SL |
1770 | else { |
1771 | tx = async_copy_data(1, wbi, &dev->page, | |
1e6d690b SL |
1772 | dev->sector, tx, sh, |
1773 | r5c_is_writeback(conf->log)); | |
1774 | if (dev->page != dev->orig_page && | |
1775 | !r5c_is_writeback(conf->log)) { | |
d592a996 SL |
1776 | set_bit(R5_SkipCopy, &dev->flags); |
1777 | clear_bit(R5_UPTODATE, &dev->flags); | |
1778 | clear_bit(R5_OVERWRITE, &dev->flags); | |
1779 | } | |
1780 | } | |
91c00924 DW |
1781 | wbi = r5_next_bio(wbi, dev->sector); |
1782 | } | |
59fc630b | 1783 | |
1784 | if (head_sh->batch_head) { | |
1785 | sh = list_first_entry(&sh->batch_list, | |
1786 | struct stripe_head, | |
1787 | batch_list); | |
1788 | if (sh == head_sh) | |
1789 | continue; | |
1790 | goto again; | |
1791 | } | |
91c00924 DW |
1792 | } |
1793 | } | |
1794 | ||
1795 | return tx; | |
1796 | } | |
1797 | ||
ac6b53b6 | 1798 | static void ops_complete_reconstruct(void *stripe_head_ref) |
91c00924 DW |
1799 | { |
1800 | struct stripe_head *sh = stripe_head_ref; | |
ac6b53b6 DW |
1801 | int disks = sh->disks; |
1802 | int pd_idx = sh->pd_idx; | |
1803 | int qd_idx = sh->qd_idx; | |
1804 | int i; | |
9e444768 | 1805 | bool fua = false, sync = false, discard = false; |
91c00924 | 1806 | |
e46b272b | 1807 | pr_debug("%s: stripe %llu\n", __func__, |
91c00924 DW |
1808 | (unsigned long long)sh->sector); |
1809 | ||
bc0934f0 | 1810 | for (i = disks; i--; ) { |
e9c7469b | 1811 | fua |= test_bit(R5_WantFUA, &sh->dev[i].flags); |
bc0934f0 | 1812 | sync |= test_bit(R5_SyncIO, &sh->dev[i].flags); |
9e444768 | 1813 | discard |= test_bit(R5_Discard, &sh->dev[i].flags); |
bc0934f0 | 1814 | } |
e9c7469b | 1815 | |
91c00924 DW |
1816 | for (i = disks; i--; ) { |
1817 | struct r5dev *dev = &sh->dev[i]; | |
ac6b53b6 | 1818 | |
e9c7469b | 1819 | if (dev->written || i == pd_idx || i == qd_idx) { |
235b6003 | 1820 | if (!discard && !test_bit(R5_SkipCopy, &dev->flags)) { |
9e444768 | 1821 | set_bit(R5_UPTODATE, &dev->flags); |
235b6003 N |
1822 | if (test_bit(STRIPE_EXPAND_READY, &sh->state)) |
1823 | set_bit(R5_Expanded, &dev->flags); | |
1824 | } | |
e9c7469b TH |
1825 | if (fua) |
1826 | set_bit(R5_WantFUA, &dev->flags); | |
bc0934f0 SL |
1827 | if (sync) |
1828 | set_bit(R5_SyncIO, &dev->flags); | |
e9c7469b | 1829 | } |
91c00924 DW |
1830 | } |
1831 | ||
d8ee0728 DW |
1832 | if (sh->reconstruct_state == reconstruct_state_drain_run) |
1833 | sh->reconstruct_state = reconstruct_state_drain_result; | |
1834 | else if (sh->reconstruct_state == reconstruct_state_prexor_drain_run) | |
1835 | sh->reconstruct_state = reconstruct_state_prexor_drain_result; | |
1836 | else { | |
1837 | BUG_ON(sh->reconstruct_state != reconstruct_state_run); | |
1838 | sh->reconstruct_state = reconstruct_state_result; | |
1839 | } | |
91c00924 DW |
1840 | |
1841 | set_bit(STRIPE_HANDLE, &sh->state); | |
6d036f7d | 1842 | raid5_release_stripe(sh); |
91c00924 DW |
1843 | } |
1844 | ||
1845 | static void | |
ac6b53b6 DW |
1846 | ops_run_reconstruct5(struct stripe_head *sh, struct raid5_percpu *percpu, |
1847 | struct dma_async_tx_descriptor *tx) | |
91c00924 | 1848 | { |
91c00924 | 1849 | int disks = sh->disks; |
59fc630b | 1850 | struct page **xor_srcs; |
a08abd8c | 1851 | struct async_submit_ctl submit; |
59fc630b | 1852 | int count, pd_idx = sh->pd_idx, i; |
91c00924 | 1853 | struct page *xor_dest; |
d8ee0728 | 1854 | int prexor = 0; |
91c00924 | 1855 | unsigned long flags; |
59fc630b | 1856 | int j = 0; |
1857 | struct stripe_head *head_sh = sh; | |
1858 | int last_stripe; | |
91c00924 | 1859 | |
e46b272b | 1860 | pr_debug("%s: stripe %llu\n", __func__, |
91c00924 DW |
1861 | (unsigned long long)sh->sector); |
1862 | ||
620125f2 SL |
1863 | for (i = 0; i < sh->disks; i++) { |
1864 | if (pd_idx == i) | |
1865 | continue; | |
1866 | if (!test_bit(R5_Discard, &sh->dev[i].flags)) | |
1867 | break; | |
1868 | } | |
1869 | if (i >= sh->disks) { | |
1870 | atomic_inc(&sh->count); | |
620125f2 SL |
1871 | set_bit(R5_Discard, &sh->dev[pd_idx].flags); |
1872 | ops_complete_reconstruct(sh); | |
1873 | return; | |
1874 | } | |
59fc630b | 1875 | again: |
1876 | count = 0; | |
1877 | xor_srcs = to_addr_page(percpu, j); | |
91c00924 DW |
1878 | /* check if prexor is active which means only process blocks |
1879 | * that are part of a read-modify-write (written) | |
1880 | */ | |
59fc630b | 1881 | if (head_sh->reconstruct_state == reconstruct_state_prexor_drain_run) { |
d8ee0728 | 1882 | prexor = 1; |
91c00924 DW |
1883 | xor_dest = xor_srcs[count++] = sh->dev[pd_idx].page; |
1884 | for (i = disks; i--; ) { | |
1885 | struct r5dev *dev = &sh->dev[i]; | |
1e6d690b SL |
1886 | if (head_sh->dev[i].written || |
1887 | test_bit(R5_InJournal, &head_sh->dev[i].flags)) | |
91c00924 DW |
1888 | xor_srcs[count++] = dev->page; |
1889 | } | |
1890 | } else { | |
1891 | xor_dest = sh->dev[pd_idx].page; | |
1892 | for (i = disks; i--; ) { | |
1893 | struct r5dev *dev = &sh->dev[i]; | |
1894 | if (i != pd_idx) | |
1895 | xor_srcs[count++] = dev->page; | |
1896 | } | |
1897 | } | |
1898 | ||
91c00924 DW |
1899 | /* 1/ if we prexor'd then the dest is reused as a source |
1900 | * 2/ if we did not prexor then we are redoing the parity | |
1901 | * set ASYNC_TX_XOR_DROP_DST and ASYNC_TX_XOR_ZERO_DST | |
1902 | * for the synchronous xor case | |
1903 | */ | |
59fc630b | 1904 | last_stripe = !head_sh->batch_head || |
1905 | list_first_entry(&sh->batch_list, | |
1906 | struct stripe_head, batch_list) == head_sh; | |
1907 | if (last_stripe) { | |
1908 | flags = ASYNC_TX_ACK | | |
1909 | (prexor ? ASYNC_TX_XOR_DROP_DST : ASYNC_TX_XOR_ZERO_DST); | |
1910 | ||
1911 | atomic_inc(&head_sh->count); | |
1912 | init_async_submit(&submit, flags, tx, ops_complete_reconstruct, head_sh, | |
1913 | to_addr_conv(sh, percpu, j)); | |
1914 | } else { | |
1915 | flags = prexor ? ASYNC_TX_XOR_DROP_DST : ASYNC_TX_XOR_ZERO_DST; | |
1916 | init_async_submit(&submit, flags, tx, NULL, NULL, | |
1917 | to_addr_conv(sh, percpu, j)); | |
1918 | } | |
91c00924 | 1919 | |
a08abd8c DW |
1920 | if (unlikely(count == 1)) |
1921 | tx = async_memcpy(xor_dest, xor_srcs[0], 0, 0, STRIPE_SIZE, &submit); | |
1922 | else | |
1923 | tx = async_xor(xor_dest, xor_srcs, 0, count, STRIPE_SIZE, &submit); | |
59fc630b | 1924 | if (!last_stripe) { |
1925 | j++; | |
1926 | sh = list_first_entry(&sh->batch_list, struct stripe_head, | |
1927 | batch_list); | |
1928 | goto again; | |
1929 | } | |
91c00924 DW |
1930 | } |
1931 | ||
ac6b53b6 DW |
1932 | static void |
1933 | ops_run_reconstruct6(struct stripe_head *sh, struct raid5_percpu *percpu, | |
1934 | struct dma_async_tx_descriptor *tx) | |
1935 | { | |
1936 | struct async_submit_ctl submit; | |
59fc630b | 1937 | struct page **blocks; |
1938 | int count, i, j = 0; | |
1939 | struct stripe_head *head_sh = sh; | |
1940 | int last_stripe; | |
584acdd4 MS |
1941 | int synflags; |
1942 | unsigned long txflags; | |
ac6b53b6 DW |
1943 | |
1944 | pr_debug("%s: stripe %llu\n", __func__, (unsigned long long)sh->sector); | |
1945 | ||
620125f2 SL |
1946 | for (i = 0; i < sh->disks; i++) { |
1947 | if (sh->pd_idx == i || sh->qd_idx == i) | |
1948 | continue; | |
1949 | if (!test_bit(R5_Discard, &sh->dev[i].flags)) | |
1950 | break; | |
1951 | } | |
1952 | if (i >= sh->disks) { | |
1953 | atomic_inc(&sh->count); | |
620125f2 SL |
1954 | set_bit(R5_Discard, &sh->dev[sh->pd_idx].flags); |
1955 | set_bit(R5_Discard, &sh->dev[sh->qd_idx].flags); | |
1956 | ops_complete_reconstruct(sh); | |
1957 | return; | |
1958 | } | |
1959 | ||
59fc630b | 1960 | again: |
1961 | blocks = to_addr_page(percpu, j); | |
584acdd4 MS |
1962 | |
1963 | if (sh->reconstruct_state == reconstruct_state_prexor_drain_run) { | |
1964 | synflags = SYNDROME_SRC_WRITTEN; | |
1965 | txflags = ASYNC_TX_ACK | ASYNC_TX_PQ_XOR_DST; | |
1966 | } else { | |
1967 | synflags = SYNDROME_SRC_ALL; | |
1968 | txflags = ASYNC_TX_ACK; | |
1969 | } | |
1970 | ||
1971 | count = set_syndrome_sources(blocks, sh, synflags); | |
59fc630b | 1972 | last_stripe = !head_sh->batch_head || |
1973 | list_first_entry(&sh->batch_list, | |
1974 | struct stripe_head, batch_list) == head_sh; | |
1975 | ||
1976 | if (last_stripe) { | |
1977 | atomic_inc(&head_sh->count); | |
584acdd4 | 1978 | init_async_submit(&submit, txflags, tx, ops_complete_reconstruct, |
59fc630b | 1979 | head_sh, to_addr_conv(sh, percpu, j)); |
1980 | } else | |
1981 | init_async_submit(&submit, 0, tx, NULL, NULL, | |
1982 | to_addr_conv(sh, percpu, j)); | |
48769695 | 1983 | tx = async_gen_syndrome(blocks, 0, count+2, STRIPE_SIZE, &submit); |
59fc630b | 1984 | if (!last_stripe) { |
1985 | j++; | |
1986 | sh = list_first_entry(&sh->batch_list, struct stripe_head, | |
1987 | batch_list); | |
1988 | goto again; | |
1989 | } | |
91c00924 DW |
1990 | } |
1991 | ||
1992 | static void ops_complete_check(void *stripe_head_ref) | |
1993 | { | |
1994 | struct stripe_head *sh = stripe_head_ref; | |
91c00924 | 1995 | |
e46b272b | 1996 | pr_debug("%s: stripe %llu\n", __func__, |
91c00924 DW |
1997 | (unsigned long long)sh->sector); |
1998 | ||
ecc65c9b | 1999 | sh->check_state = check_state_check_result; |
91c00924 | 2000 | set_bit(STRIPE_HANDLE, &sh->state); |
6d036f7d | 2001 | raid5_release_stripe(sh); |
91c00924 DW |
2002 | } |
2003 | ||
ac6b53b6 | 2004 | static void ops_run_check_p(struct stripe_head *sh, struct raid5_percpu *percpu) |
91c00924 | 2005 | { |
91c00924 | 2006 | int disks = sh->disks; |
ac6b53b6 DW |
2007 | int pd_idx = sh->pd_idx; |
2008 | int qd_idx = sh->qd_idx; | |
2009 | struct page *xor_dest; | |
46d5b785 | 2010 | struct page **xor_srcs = to_addr_page(percpu, 0); |
91c00924 | 2011 | struct dma_async_tx_descriptor *tx; |
a08abd8c | 2012 | struct async_submit_ctl submit; |
ac6b53b6 DW |
2013 | int count; |
2014 | int i; | |
91c00924 | 2015 | |
e46b272b | 2016 | pr_debug("%s: stripe %llu\n", __func__, |
91c00924 DW |
2017 | (unsigned long long)sh->sector); |
2018 | ||
59fc630b | 2019 | BUG_ON(sh->batch_head); |
ac6b53b6 DW |
2020 | count = 0; |
2021 | xor_dest = sh->dev[pd_idx].page; | |
2022 | xor_srcs[count++] = xor_dest; | |
91c00924 | 2023 | for (i = disks; i--; ) { |
ac6b53b6 DW |
2024 | if (i == pd_idx || i == qd_idx) |
2025 | continue; | |
2026 | xor_srcs[count++] = sh->dev[i].page; | |
91c00924 DW |
2027 | } |
2028 | ||
d6f38f31 | 2029 | init_async_submit(&submit, 0, NULL, NULL, NULL, |
46d5b785 | 2030 | to_addr_conv(sh, percpu, 0)); |
099f53cb | 2031 | tx = async_xor_val(xor_dest, xor_srcs, 0, count, STRIPE_SIZE, |
a08abd8c | 2032 | &sh->ops.zero_sum_result, &submit); |
91c00924 | 2033 | |
91c00924 | 2034 | atomic_inc(&sh->count); |
a08abd8c DW |
2035 | init_async_submit(&submit, ASYNC_TX_ACK, tx, ops_complete_check, sh, NULL); |
2036 | tx = async_trigger_callback(&submit); | |
91c00924 DW |
2037 | } |
2038 | ||
ac6b53b6 DW |
2039 | static void ops_run_check_pq(struct stripe_head *sh, struct raid5_percpu *percpu, int checkp) |
2040 | { | |
46d5b785 | 2041 | struct page **srcs = to_addr_page(percpu, 0); |
ac6b53b6 DW |
2042 | struct async_submit_ctl submit; |
2043 | int count; | |
2044 | ||
2045 | pr_debug("%s: stripe %llu checkp: %d\n", __func__, | |
2046 | (unsigned long long)sh->sector, checkp); | |
2047 | ||
59fc630b | 2048 | BUG_ON(sh->batch_head); |
584acdd4 | 2049 | count = set_syndrome_sources(srcs, sh, SYNDROME_SRC_ALL); |
ac6b53b6 DW |
2050 | if (!checkp) |
2051 | srcs[count] = NULL; | |
91c00924 | 2052 | |
91c00924 | 2053 | atomic_inc(&sh->count); |
ac6b53b6 | 2054 | init_async_submit(&submit, ASYNC_TX_ACK, NULL, ops_complete_check, |
46d5b785 | 2055 | sh, to_addr_conv(sh, percpu, 0)); |
ac6b53b6 DW |
2056 | async_syndrome_val(srcs, 0, count+2, STRIPE_SIZE, |
2057 | &sh->ops.zero_sum_result, percpu->spare_page, &submit); | |
91c00924 DW |
2058 | } |
2059 | ||
51acbcec | 2060 | static void raid_run_ops(struct stripe_head *sh, unsigned long ops_request) |
91c00924 DW |
2061 | { |
2062 | int overlap_clear = 0, i, disks = sh->disks; | |
2063 | struct dma_async_tx_descriptor *tx = NULL; | |
d1688a6d | 2064 | struct r5conf *conf = sh->raid_conf; |
ac6b53b6 | 2065 | int level = conf->level; |
d6f38f31 DW |
2066 | struct raid5_percpu *percpu; |
2067 | unsigned long cpu; | |
91c00924 | 2068 | |
d6f38f31 DW |
2069 | cpu = get_cpu(); |
2070 | percpu = per_cpu_ptr(conf->percpu, cpu); | |
83de75cc | 2071 | if (test_bit(STRIPE_OP_BIOFILL, &ops_request)) { |
91c00924 DW |
2072 | ops_run_biofill(sh); |
2073 | overlap_clear++; | |
2074 | } | |
2075 | ||
7b3a871e | 2076 | if (test_bit(STRIPE_OP_COMPUTE_BLK, &ops_request)) { |
ac6b53b6 DW |
2077 | if (level < 6) |
2078 | tx = ops_run_compute5(sh, percpu); | |
2079 | else { | |
2080 | if (sh->ops.target2 < 0 || sh->ops.target < 0) | |
2081 | tx = ops_run_compute6_1(sh, percpu); | |
2082 | else | |
2083 | tx = ops_run_compute6_2(sh, percpu); | |
2084 | } | |
2085 | /* terminate the chain if reconstruct is not set to be run */ | |
2086 | if (tx && !test_bit(STRIPE_OP_RECONSTRUCT, &ops_request)) | |
7b3a871e DW |
2087 | async_tx_ack(tx); |
2088 | } | |
91c00924 | 2089 | |
584acdd4 MS |
2090 | if (test_bit(STRIPE_OP_PREXOR, &ops_request)) { |
2091 | if (level < 6) | |
2092 | tx = ops_run_prexor5(sh, percpu, tx); | |
2093 | else | |
2094 | tx = ops_run_prexor6(sh, percpu, tx); | |
2095 | } | |
91c00924 | 2096 | |
ae1713e2 AP |
2097 | if (test_bit(STRIPE_OP_PARTIAL_PARITY, &ops_request)) |
2098 | tx = ops_run_partial_parity(sh, percpu, tx); | |
2099 | ||
600aa109 | 2100 | if (test_bit(STRIPE_OP_BIODRAIN, &ops_request)) { |
d8ee0728 | 2101 | tx = ops_run_biodrain(sh, tx); |
91c00924 DW |
2102 | overlap_clear++; |
2103 | } | |
2104 | ||
ac6b53b6 DW |
2105 | if (test_bit(STRIPE_OP_RECONSTRUCT, &ops_request)) { |
2106 | if (level < 6) | |
2107 | ops_run_reconstruct5(sh, percpu, tx); | |
2108 | else | |
2109 | ops_run_reconstruct6(sh, percpu, tx); | |
2110 | } | |
91c00924 | 2111 | |
ac6b53b6 DW |
2112 | if (test_bit(STRIPE_OP_CHECK, &ops_request)) { |
2113 | if (sh->check_state == check_state_run) | |
2114 | ops_run_check_p(sh, percpu); | |
2115 | else if (sh->check_state == check_state_run_q) | |
2116 | ops_run_check_pq(sh, percpu, 0); | |
2117 | else if (sh->check_state == check_state_run_pq) | |
2118 | ops_run_check_pq(sh, percpu, 1); | |
2119 | else | |
2120 | BUG(); | |
2121 | } | |
91c00924 | 2122 | |
59fc630b | 2123 | if (overlap_clear && !sh->batch_head) |
91c00924 DW |
2124 | for (i = disks; i--; ) { |
2125 | struct r5dev *dev = &sh->dev[i]; | |
2126 | if (test_and_clear_bit(R5_Overlap, &dev->flags)) | |
2127 | wake_up(&sh->raid_conf->wait_for_overlap); | |
2128 | } | |
d6f38f31 | 2129 | put_cpu(); |
91c00924 DW |
2130 | } |
2131 | ||
845b9e22 AP |
2132 | static void free_stripe(struct kmem_cache *sc, struct stripe_head *sh) |
2133 | { | |
2134 | if (sh->ppl_page) | |
2135 | __free_page(sh->ppl_page); | |
2136 | kmem_cache_free(sc, sh); | |
2137 | } | |
2138 | ||
5f9d1fde | 2139 | static struct stripe_head *alloc_stripe(struct kmem_cache *sc, gfp_t gfp, |
845b9e22 | 2140 | int disks, struct r5conf *conf) |
f18c1a35 N |
2141 | { |
2142 | struct stripe_head *sh; | |
5f9d1fde | 2143 | int i; |
f18c1a35 N |
2144 | |
2145 | sh = kmem_cache_zalloc(sc, gfp); | |
2146 | if (sh) { | |
2147 | spin_lock_init(&sh->stripe_lock); | |
2148 | spin_lock_init(&sh->batch_lock); | |
2149 | INIT_LIST_HEAD(&sh->batch_list); | |
2150 | INIT_LIST_HEAD(&sh->lru); | |
a39f7afd | 2151 | INIT_LIST_HEAD(&sh->r5c); |
d7bd398e | 2152 | INIT_LIST_HEAD(&sh->log_list); |
f18c1a35 | 2153 | atomic_set(&sh->count, 1); |
845b9e22 | 2154 | sh->raid_conf = conf; |
a39f7afd | 2155 | sh->log_start = MaxSector; |
5f9d1fde SL |
2156 | for (i = 0; i < disks; i++) { |
2157 | struct r5dev *dev = &sh->dev[i]; | |
2158 | ||
3a83f467 ML |
2159 | bio_init(&dev->req, &dev->vec, 1); |
2160 | bio_init(&dev->rreq, &dev->rvec, 1); | |
5f9d1fde | 2161 | } |
845b9e22 AP |
2162 | |
2163 | if (raid5_has_ppl(conf)) { | |
2164 | sh->ppl_page = alloc_page(gfp); | |
2165 | if (!sh->ppl_page) { | |
2166 | free_stripe(sc, sh); | |
2167 | sh = NULL; | |
2168 | } | |
2169 | } | |
f18c1a35 N |
2170 | } |
2171 | return sh; | |
2172 | } | |
486f0644 | 2173 | static int grow_one_stripe(struct r5conf *conf, gfp_t gfp) |
1da177e4 LT |
2174 | { |
2175 | struct stripe_head *sh; | |
f18c1a35 | 2176 | |
845b9e22 | 2177 | sh = alloc_stripe(conf->slab_cache, gfp, conf->pool_size, conf); |
3f294f4f N |
2178 | if (!sh) |
2179 | return 0; | |
6ce32846 | 2180 | |
a9683a79 | 2181 | if (grow_buffers(sh, gfp)) { |
e4e11e38 | 2182 | shrink_buffers(sh); |
845b9e22 | 2183 | free_stripe(conf->slab_cache, sh); |
3f294f4f N |
2184 | return 0; |
2185 | } | |
486f0644 N |
2186 | sh->hash_lock_index = |
2187 | conf->max_nr_stripes % NR_STRIPE_HASH_LOCKS; | |
3f294f4f | 2188 | /* we just created an active stripe so... */ |
3f294f4f | 2189 | atomic_inc(&conf->active_stripes); |
59fc630b | 2190 | |
6d036f7d | 2191 | raid5_release_stripe(sh); |
486f0644 | 2192 | conf->max_nr_stripes++; |
3f294f4f N |
2193 | return 1; |
2194 | } | |
2195 | ||
d1688a6d | 2196 | static int grow_stripes(struct r5conf *conf, int num) |
3f294f4f | 2197 | { |
e18b890b | 2198 | struct kmem_cache *sc; |
53b8d89d | 2199 | size_t namelen = sizeof(conf->cache_name[0]); |
5e5e3e78 | 2200 | int devs = max(conf->raid_disks, conf->previous_raid_disks); |
1da177e4 | 2201 | |
f4be6b43 | 2202 | if (conf->mddev->gendisk) |
53b8d89d | 2203 | snprintf(conf->cache_name[0], namelen, |
f4be6b43 N |
2204 | "raid%d-%s", conf->level, mdname(conf->mddev)); |
2205 | else | |
53b8d89d | 2206 | snprintf(conf->cache_name[0], namelen, |
f4be6b43 | 2207 | "raid%d-%p", conf->level, conf->mddev); |
53b8d89d | 2208 | snprintf(conf->cache_name[1], namelen, "%.27s-alt", conf->cache_name[0]); |
f4be6b43 | 2209 | |
ad01c9e3 N |
2210 | conf->active_name = 0; |
2211 | sc = kmem_cache_create(conf->cache_name[conf->active_name], | |
1da177e4 | 2212 | sizeof(struct stripe_head)+(devs-1)*sizeof(struct r5dev), |
20c2df83 | 2213 | 0, 0, NULL); |
1da177e4 LT |
2214 | if (!sc) |
2215 | return 1; | |
2216 | conf->slab_cache = sc; | |
ad01c9e3 | 2217 | conf->pool_size = devs; |
486f0644 N |
2218 | while (num--) |
2219 | if (!grow_one_stripe(conf, GFP_KERNEL)) | |
1da177e4 | 2220 | return 1; |
486f0644 | 2221 | |
1da177e4 LT |
2222 | return 0; |
2223 | } | |
29269553 | 2224 | |
d6f38f31 DW |
2225 | /** |
2226 | * scribble_len - return the required size of the scribble region | |
2227 | * @num - total number of disks in the array | |
2228 | * | |
2229 | * The size must be enough to contain: | |
2230 | * 1/ a struct page pointer for each device in the array +2 | |
2231 | * 2/ room to convert each entry in (1) to its corresponding dma | |
2232 | * (dma_map_page()) or page (page_address()) address. | |
2233 | * | |
2234 | * Note: the +2 is for the destination buffers of the ddf/raid6 case where we | |
2235 | * calculate over all devices (not just the data blocks), using zeros in place | |
2236 | * of the P and Q blocks. | |
2237 | */ | |
46d5b785 | 2238 | static struct flex_array *scribble_alloc(int num, int cnt, gfp_t flags) |
d6f38f31 | 2239 | { |
46d5b785 | 2240 | struct flex_array *ret; |
d6f38f31 DW |
2241 | size_t len; |
2242 | ||
2243 | len = sizeof(struct page *) * (num+2) + sizeof(addr_conv_t) * (num+2); | |
46d5b785 | 2244 | ret = flex_array_alloc(len, cnt, flags); |
2245 | if (!ret) | |
2246 | return NULL; | |
2247 | /* always prealloc all elements, so no locking is required */ | |
2248 | if (flex_array_prealloc(ret, 0, cnt, flags)) { | |
2249 | flex_array_free(ret); | |
2250 | return NULL; | |
2251 | } | |
2252 | return ret; | |
d6f38f31 DW |
2253 | } |
2254 | ||
738a2738 N |
2255 | static int resize_chunks(struct r5conf *conf, int new_disks, int new_sectors) |
2256 | { | |
2257 | unsigned long cpu; | |
2258 | int err = 0; | |
2259 | ||
27a353c0 SL |
2260 | /* |
2261 | * Never shrink. And mddev_suspend() could deadlock if this is called | |
2262 | * from raid5d. In that case, scribble_disks and scribble_sectors | |
2263 | * should equal to new_disks and new_sectors | |
2264 | */ | |
2265 | if (conf->scribble_disks >= new_disks && | |
2266 | conf->scribble_sectors >= new_sectors) | |
2267 | return 0; | |
738a2738 N |
2268 | mddev_suspend(conf->mddev); |
2269 | get_online_cpus(); | |
2270 | for_each_present_cpu(cpu) { | |
2271 | struct raid5_percpu *percpu; | |
2272 | struct flex_array *scribble; | |
2273 | ||
2274 | percpu = per_cpu_ptr(conf->percpu, cpu); | |
2275 | scribble = scribble_alloc(new_disks, | |
2276 | new_sectors / STRIPE_SECTORS, | |
2277 | GFP_NOIO); | |
2278 | ||
2279 | if (scribble) { | |
2280 | flex_array_free(percpu->scribble); | |
2281 | percpu->scribble = scribble; | |
2282 | } else { | |
2283 | err = -ENOMEM; | |
2284 | break; | |
2285 | } | |
2286 | } | |
2287 | put_online_cpus(); | |
2288 | mddev_resume(conf->mddev); | |
27a353c0 SL |
2289 | if (!err) { |
2290 | conf->scribble_disks = new_disks; | |
2291 | conf->scribble_sectors = new_sectors; | |
2292 | } | |
738a2738 N |
2293 | return err; |
2294 | } | |
2295 | ||
d1688a6d | 2296 | static int resize_stripes(struct r5conf *conf, int newsize) |
ad01c9e3 N |
2297 | { |
2298 | /* Make all the stripes able to hold 'newsize' devices. | |
2299 | * New slots in each stripe get 'page' set to a new page. | |
2300 | * | |
2301 | * This happens in stages: | |
2302 | * 1/ create a new kmem_cache and allocate the required number of | |
2303 | * stripe_heads. | |
83f0d77a | 2304 | * 2/ gather all the old stripe_heads and transfer the pages across |
ad01c9e3 N |
2305 | * to the new stripe_heads. This will have the side effect of |
2306 | * freezing the array as once all stripe_heads have been collected, | |
2307 | * no IO will be possible. Old stripe heads are freed once their | |
2308 | * pages have been transferred over, and the old kmem_cache is | |
2309 | * freed when all stripes are done. | |
2310 | * 3/ reallocate conf->disks to be suitable bigger. If this fails, | |
3560741e | 2311 | * we simple return a failure status - no need to clean anything up. |
ad01c9e3 N |
2312 | * 4/ allocate new pages for the new slots in the new stripe_heads. |
2313 | * If this fails, we don't bother trying the shrink the | |
2314 | * stripe_heads down again, we just leave them as they are. | |
2315 | * As each stripe_head is processed the new one is released into | |
2316 | * active service. | |
2317 | * | |
2318 | * Once step2 is started, we cannot afford to wait for a write, | |
2319 | * so we use GFP_NOIO allocations. | |
2320 | */ | |
2321 | struct stripe_head *osh, *nsh; | |
2322 | LIST_HEAD(newstripes); | |
2323 | struct disk_info *ndisks; | |
2214c260 | 2324 | int err = 0; |
e18b890b | 2325 | struct kmem_cache *sc; |
ad01c9e3 | 2326 | int i; |
566c09c5 | 2327 | int hash, cnt; |
ad01c9e3 | 2328 | |
2214c260 | 2329 | md_allow_write(conf->mddev); |
2a2275d6 | 2330 | |
ad01c9e3 N |
2331 | /* Step 1 */ |
2332 | sc = kmem_cache_create(conf->cache_name[1-conf->active_name], | |
2333 | sizeof(struct stripe_head)+(newsize-1)*sizeof(struct r5dev), | |
20c2df83 | 2334 | 0, 0, NULL); |
ad01c9e3 N |
2335 | if (!sc) |
2336 | return -ENOMEM; | |
2337 | ||
2d5b569b N |
2338 | /* Need to ensure auto-resizing doesn't interfere */ |
2339 | mutex_lock(&conf->cache_size_mutex); | |
2340 | ||
ad01c9e3 | 2341 | for (i = conf->max_nr_stripes; i; i--) { |
845b9e22 | 2342 | nsh = alloc_stripe(sc, GFP_KERNEL, newsize, conf); |
ad01c9e3 N |
2343 | if (!nsh) |
2344 | break; | |
2345 | ||
ad01c9e3 N |
2346 | list_add(&nsh->lru, &newstripes); |
2347 | } | |
2348 | if (i) { | |
2349 | /* didn't get enough, give up */ | |
2350 | while (!list_empty(&newstripes)) { | |
2351 | nsh = list_entry(newstripes.next, struct stripe_head, lru); | |
2352 | list_del(&nsh->lru); | |
845b9e22 | 2353 | free_stripe(sc, nsh); |
ad01c9e3 N |
2354 | } |
2355 | kmem_cache_destroy(sc); | |
2d5b569b | 2356 | mutex_unlock(&conf->cache_size_mutex); |
ad01c9e3 N |
2357 | return -ENOMEM; |
2358 | } | |
2359 | /* Step 2 - Must use GFP_NOIO now. | |
2360 | * OK, we have enough stripes, start collecting inactive | |
2361 | * stripes and copying them over | |
2362 | */ | |
566c09c5 SL |
2363 | hash = 0; |
2364 | cnt = 0; | |
ad01c9e3 | 2365 | list_for_each_entry(nsh, &newstripes, lru) { |
566c09c5 | 2366 | lock_device_hash_lock(conf, hash); |
6ab2a4b8 | 2367 | wait_event_cmd(conf->wait_for_stripe, |
566c09c5 SL |
2368 | !list_empty(conf->inactive_list + hash), |
2369 | unlock_device_hash_lock(conf, hash), | |
2370 | lock_device_hash_lock(conf, hash)); | |
2371 | osh = get_free_stripe(conf, hash); | |
2372 | unlock_device_hash_lock(conf, hash); | |
f18c1a35 | 2373 | |
d592a996 | 2374 | for(i=0; i<conf->pool_size; i++) { |
ad01c9e3 | 2375 | nsh->dev[i].page = osh->dev[i].page; |
d592a996 SL |
2376 | nsh->dev[i].orig_page = osh->dev[i].page; |
2377 | } | |
566c09c5 | 2378 | nsh->hash_lock_index = hash; |
845b9e22 | 2379 | free_stripe(conf->slab_cache, osh); |
566c09c5 SL |
2380 | cnt++; |
2381 | if (cnt >= conf->max_nr_stripes / NR_STRIPE_HASH_LOCKS + | |
2382 | !!((conf->max_nr_stripes % NR_STRIPE_HASH_LOCKS) > hash)) { | |
2383 | hash++; | |
2384 | cnt = 0; | |
2385 | } | |
ad01c9e3 N |
2386 | } |
2387 | kmem_cache_destroy(conf->slab_cache); | |
2388 | ||
2389 | /* Step 3. | |
2390 | * At this point, we are holding all the stripes so the array | |
2391 | * is completely stalled, so now is a good time to resize | |
d6f38f31 | 2392 | * conf->disks and the scribble region |
ad01c9e3 N |
2393 | */ |
2394 | ndisks = kzalloc(newsize * sizeof(struct disk_info), GFP_NOIO); | |
2395 | if (ndisks) { | |
d7bd398e | 2396 | for (i = 0; i < conf->pool_size; i++) |
ad01c9e3 | 2397 | ndisks[i] = conf->disks[i]; |
d7bd398e SL |
2398 | |
2399 | for (i = conf->pool_size; i < newsize; i++) { | |
2400 | ndisks[i].extra_page = alloc_page(GFP_NOIO); | |
2401 | if (!ndisks[i].extra_page) | |
2402 | err = -ENOMEM; | |
2403 | } | |
2404 | ||
2405 | if (err) { | |
2406 | for (i = conf->pool_size; i < newsize; i++) | |
2407 | if (ndisks[i].extra_page) | |
2408 | put_page(ndisks[i].extra_page); | |
2409 | kfree(ndisks); | |
2410 | } else { | |
2411 | kfree(conf->disks); | |
2412 | conf->disks = ndisks; | |
2413 | } | |
ad01c9e3 N |
2414 | } else |
2415 | err = -ENOMEM; | |
2416 | ||
2d5b569b | 2417 | mutex_unlock(&conf->cache_size_mutex); |
583da48e DY |
2418 | |
2419 | conf->slab_cache = sc; | |
2420 | conf->active_name = 1-conf->active_name; | |
2421 | ||
ad01c9e3 N |
2422 | /* Step 4, return new stripes to service */ |
2423 | while(!list_empty(&newstripes)) { | |
2424 | nsh = list_entry(newstripes.next, struct stripe_head, lru); | |
2425 | list_del_init(&nsh->lru); | |
d6f38f31 | 2426 | |
ad01c9e3 N |
2427 | for (i=conf->raid_disks; i < newsize; i++) |
2428 | if (nsh->dev[i].page == NULL) { | |
2429 | struct page *p = alloc_page(GFP_NOIO); | |
2430 | nsh->dev[i].page = p; | |
d592a996 | 2431 | nsh->dev[i].orig_page = p; |
ad01c9e3 N |
2432 | if (!p) |
2433 | err = -ENOMEM; | |
2434 | } | |
6d036f7d | 2435 | raid5_release_stripe(nsh); |
ad01c9e3 N |
2436 | } |
2437 | /* critical section pass, GFP_NOIO no longer needed */ | |
2438 | ||
6e9eac2d N |
2439 | if (!err) |
2440 | conf->pool_size = newsize; | |
ad01c9e3 N |
2441 | return err; |
2442 | } | |
1da177e4 | 2443 | |
486f0644 | 2444 | static int drop_one_stripe(struct r5conf *conf) |
1da177e4 LT |
2445 | { |
2446 | struct stripe_head *sh; | |
49895bcc | 2447 | int hash = (conf->max_nr_stripes - 1) & STRIPE_HASH_LOCKS_MASK; |
1da177e4 | 2448 | |
566c09c5 SL |
2449 | spin_lock_irq(conf->hash_locks + hash); |
2450 | sh = get_free_stripe(conf, hash); | |
2451 | spin_unlock_irq(conf->hash_locks + hash); | |
3f294f4f N |
2452 | if (!sh) |
2453 | return 0; | |
78bafebd | 2454 | BUG_ON(atomic_read(&sh->count)); |
e4e11e38 | 2455 | shrink_buffers(sh); |
845b9e22 | 2456 | free_stripe(conf->slab_cache, sh); |
3f294f4f | 2457 | atomic_dec(&conf->active_stripes); |
486f0644 | 2458 | conf->max_nr_stripes--; |
3f294f4f N |
2459 | return 1; |
2460 | } | |
2461 | ||
d1688a6d | 2462 | static void shrink_stripes(struct r5conf *conf) |
3f294f4f | 2463 | { |
486f0644 N |
2464 | while (conf->max_nr_stripes && |
2465 | drop_one_stripe(conf)) | |
2466 | ; | |
3f294f4f | 2467 | |
644df1a8 | 2468 | kmem_cache_destroy(conf->slab_cache); |
1da177e4 LT |
2469 | conf->slab_cache = NULL; |
2470 | } | |
2471 | ||
4246a0b6 | 2472 | static void raid5_end_read_request(struct bio * bi) |
1da177e4 | 2473 | { |
99c0fb5f | 2474 | struct stripe_head *sh = bi->bi_private; |
d1688a6d | 2475 | struct r5conf *conf = sh->raid_conf; |
7ecaa1e6 | 2476 | int disks = sh->disks, i; |
d6950432 | 2477 | char b[BDEVNAME_SIZE]; |
dd054fce | 2478 | struct md_rdev *rdev = NULL; |
05616be5 | 2479 | sector_t s; |
1da177e4 LT |
2480 | |
2481 | for (i=0 ; i<disks; i++) | |
2482 | if (bi == &sh->dev[i].req) | |
2483 | break; | |
2484 | ||
4246a0b6 | 2485 | pr_debug("end_read_request %llu/%d, count: %d, error %d.\n", |
45b4233c | 2486 | (unsigned long long)sh->sector, i, atomic_read(&sh->count), |
4e4cbee9 | 2487 | bi->bi_status); |
1da177e4 | 2488 | if (i == disks) { |
5f9d1fde | 2489 | bio_reset(bi); |
1da177e4 | 2490 | BUG(); |
6712ecf8 | 2491 | return; |
1da177e4 | 2492 | } |
14a75d3e | 2493 | if (test_bit(R5_ReadRepl, &sh->dev[i].flags)) |
dd054fce N |
2494 | /* If replacement finished while this request was outstanding, |
2495 | * 'replacement' might be NULL already. | |
2496 | * In that case it moved down to 'rdev'. | |
2497 | * rdev is not removed until all requests are finished. | |
2498 | */ | |
14a75d3e | 2499 | rdev = conf->disks[i].replacement; |
dd054fce | 2500 | if (!rdev) |
14a75d3e | 2501 | rdev = conf->disks[i].rdev; |
1da177e4 | 2502 | |
05616be5 N |
2503 | if (use_new_offset(conf, sh)) |
2504 | s = sh->sector + rdev->new_data_offset; | |
2505 | else | |
2506 | s = sh->sector + rdev->data_offset; | |
4e4cbee9 | 2507 | if (!bi->bi_status) { |
1da177e4 | 2508 | set_bit(R5_UPTODATE, &sh->dev[i].flags); |
4e5314b5 | 2509 | if (test_bit(R5_ReadError, &sh->dev[i].flags)) { |
14a75d3e N |
2510 | /* Note that this cannot happen on a |
2511 | * replacement device. We just fail those on | |
2512 | * any error | |
2513 | */ | |
cc6167b4 N |
2514 | pr_info_ratelimited( |
2515 | "md/raid:%s: read error corrected (%lu sectors at %llu on %s)\n", | |
8bda470e | 2516 | mdname(conf->mddev), STRIPE_SECTORS, |
05616be5 | 2517 | (unsigned long long)s, |
8bda470e | 2518 | bdevname(rdev->bdev, b)); |
ddd5115f | 2519 | atomic_add(STRIPE_SECTORS, &rdev->corrected_errors); |
4e5314b5 N |
2520 | clear_bit(R5_ReadError, &sh->dev[i].flags); |
2521 | clear_bit(R5_ReWrite, &sh->dev[i].flags); | |
3f9e7c14 | 2522 | } else if (test_bit(R5_ReadNoMerge, &sh->dev[i].flags)) |
2523 | clear_bit(R5_ReadNoMerge, &sh->dev[i].flags); | |
2524 | ||
86aa1397 SL |
2525 | if (test_bit(R5_InJournal, &sh->dev[i].flags)) |
2526 | /* | |
2527 | * end read for a page in journal, this | |
2528 | * must be preparing for prexor in rmw | |
2529 | */ | |
2530 | set_bit(R5_OrigPageUPTDODATE, &sh->dev[i].flags); | |
2531 | ||
14a75d3e N |
2532 | if (atomic_read(&rdev->read_errors)) |
2533 | atomic_set(&rdev->read_errors, 0); | |
1da177e4 | 2534 | } else { |
14a75d3e | 2535 | const char *bdn = bdevname(rdev->bdev, b); |
ba22dcbf | 2536 | int retry = 0; |
2e8ac303 | 2537 | int set_bad = 0; |
d6950432 | 2538 | |
1da177e4 | 2539 | clear_bit(R5_UPTODATE, &sh->dev[i].flags); |
d6950432 | 2540 | atomic_inc(&rdev->read_errors); |
14a75d3e | 2541 | if (test_bit(R5_ReadRepl, &sh->dev[i].flags)) |
cc6167b4 N |
2542 | pr_warn_ratelimited( |
2543 | "md/raid:%s: read error on replacement device (sector %llu on %s).\n", | |
14a75d3e | 2544 | mdname(conf->mddev), |
05616be5 | 2545 | (unsigned long long)s, |
14a75d3e | 2546 | bdn); |
2e8ac303 | 2547 | else if (conf->mddev->degraded >= conf->max_degraded) { |
2548 | set_bad = 1; | |
cc6167b4 N |
2549 | pr_warn_ratelimited( |
2550 | "md/raid:%s: read error not correctable (sector %llu on %s).\n", | |
8bda470e | 2551 | mdname(conf->mddev), |
05616be5 | 2552 | (unsigned long long)s, |
8bda470e | 2553 | bdn); |
2e8ac303 | 2554 | } else if (test_bit(R5_ReWrite, &sh->dev[i].flags)) { |
4e5314b5 | 2555 | /* Oh, no!!! */ |
2e8ac303 | 2556 | set_bad = 1; |
cc6167b4 N |
2557 | pr_warn_ratelimited( |
2558 | "md/raid:%s: read error NOT corrected!! (sector %llu on %s).\n", | |
8bda470e | 2559 | mdname(conf->mddev), |
05616be5 | 2560 | (unsigned long long)s, |
8bda470e | 2561 | bdn); |
2e8ac303 | 2562 | } else if (atomic_read(&rdev->read_errors) |
ba22dcbf | 2563 | > conf->max_nr_stripes) |
cc6167b4 | 2564 | pr_warn("md/raid:%s: Too many read errors, failing device %s.\n", |
d6950432 | 2565 | mdname(conf->mddev), bdn); |
ba22dcbf N |
2566 | else |
2567 | retry = 1; | |
edfa1f65 BY |
2568 | if (set_bad && test_bit(In_sync, &rdev->flags) |
2569 | && !test_bit(R5_ReadNoMerge, &sh->dev[i].flags)) | |
2570 | retry = 1; | |
ba22dcbf | 2571 | if (retry) |
3f9e7c14 | 2572 | if (test_bit(R5_ReadNoMerge, &sh->dev[i].flags)) { |
2573 | set_bit(R5_ReadError, &sh->dev[i].flags); | |
2574 | clear_bit(R5_ReadNoMerge, &sh->dev[i].flags); | |
2575 | } else | |
2576 | set_bit(R5_ReadNoMerge, &sh->dev[i].flags); | |
ba22dcbf | 2577 | else { |
4e5314b5 N |
2578 | clear_bit(R5_ReadError, &sh->dev[i].flags); |
2579 | clear_bit(R5_ReWrite, &sh->dev[i].flags); | |
2e8ac303 | 2580 | if (!(set_bad |
2581 | && test_bit(In_sync, &rdev->flags) | |
2582 | && rdev_set_badblocks( | |
2583 | rdev, sh->sector, STRIPE_SECTORS, 0))) | |
2584 | md_error(conf->mddev, rdev); | |
ba22dcbf | 2585 | } |
1da177e4 | 2586 | } |
14a75d3e | 2587 | rdev_dec_pending(rdev, conf->mddev); |
c9445555 | 2588 | bio_reset(bi); |
1da177e4 LT |
2589 | clear_bit(R5_LOCKED, &sh->dev[i].flags); |
2590 | set_bit(STRIPE_HANDLE, &sh->state); | |
6d036f7d | 2591 | raid5_release_stripe(sh); |
1da177e4 LT |
2592 | } |
2593 | ||
4246a0b6 | 2594 | static void raid5_end_write_request(struct bio *bi) |
1da177e4 | 2595 | { |
99c0fb5f | 2596 | struct stripe_head *sh = bi->bi_private; |
d1688a6d | 2597 | struct r5conf *conf = sh->raid_conf; |
7ecaa1e6 | 2598 | int disks = sh->disks, i; |
977df362 | 2599 | struct md_rdev *uninitialized_var(rdev); |
b84db560 N |
2600 | sector_t first_bad; |
2601 | int bad_sectors; | |
977df362 | 2602 | int replacement = 0; |
1da177e4 | 2603 | |
977df362 N |
2604 | for (i = 0 ; i < disks; i++) { |
2605 | if (bi == &sh->dev[i].req) { | |
2606 | rdev = conf->disks[i].rdev; | |
1da177e4 | 2607 | break; |
977df362 N |
2608 | } |
2609 | if (bi == &sh->dev[i].rreq) { | |
2610 | rdev = conf->disks[i].replacement; | |
dd054fce N |
2611 | if (rdev) |
2612 | replacement = 1; | |
2613 | else | |
2614 | /* rdev was removed and 'replacement' | |
2615 | * replaced it. rdev is not removed | |
2616 | * until all requests are finished. | |
2617 | */ | |
2618 | rdev = conf->disks[i].rdev; | |
977df362 N |
2619 | break; |
2620 | } | |
2621 | } | |
4246a0b6 | 2622 | pr_debug("end_write_request %llu/%d, count %d, error: %d.\n", |
1da177e4 | 2623 | (unsigned long long)sh->sector, i, atomic_read(&sh->count), |
4e4cbee9 | 2624 | bi->bi_status); |
1da177e4 | 2625 | if (i == disks) { |
5f9d1fde | 2626 | bio_reset(bi); |
1da177e4 | 2627 | BUG(); |
6712ecf8 | 2628 | return; |
1da177e4 LT |
2629 | } |
2630 | ||
977df362 | 2631 | if (replacement) { |
4e4cbee9 | 2632 | if (bi->bi_status) |
977df362 N |
2633 | md_error(conf->mddev, rdev); |
2634 | else if (is_badblock(rdev, sh->sector, | |
2635 | STRIPE_SECTORS, | |
2636 | &first_bad, &bad_sectors)) | |
2637 | set_bit(R5_MadeGoodRepl, &sh->dev[i].flags); | |
2638 | } else { | |
4e4cbee9 | 2639 | if (bi->bi_status) { |
9f97e4b1 | 2640 | set_bit(STRIPE_DEGRADED, &sh->state); |
977df362 N |
2641 | set_bit(WriteErrorSeen, &rdev->flags); |
2642 | set_bit(R5_WriteError, &sh->dev[i].flags); | |
3a6de292 N |
2643 | if (!test_and_set_bit(WantReplacement, &rdev->flags)) |
2644 | set_bit(MD_RECOVERY_NEEDED, | |
2645 | &rdev->mddev->recovery); | |
977df362 N |
2646 | } else if (is_badblock(rdev, sh->sector, |
2647 | STRIPE_SECTORS, | |
c0b32972 | 2648 | &first_bad, &bad_sectors)) { |
977df362 | 2649 | set_bit(R5_MadeGood, &sh->dev[i].flags); |
c0b32972 N |
2650 | if (test_bit(R5_ReadError, &sh->dev[i].flags)) |
2651 | /* That was a successful write so make | |
2652 | * sure it looks like we already did | |
2653 | * a re-write. | |
2654 | */ | |
2655 | set_bit(R5_ReWrite, &sh->dev[i].flags); | |
2656 | } | |
977df362 N |
2657 | } |
2658 | rdev_dec_pending(rdev, conf->mddev); | |
1da177e4 | 2659 | |
4e4cbee9 | 2660 | if (sh->batch_head && bi->bi_status && !replacement) |
72ac7330 | 2661 | set_bit(STRIPE_BATCH_ERR, &sh->batch_head->state); |
2662 | ||
c9445555 | 2663 | bio_reset(bi); |
977df362 N |
2664 | if (!test_and_clear_bit(R5_DOUBLE_LOCKED, &sh->dev[i].flags)) |
2665 | clear_bit(R5_LOCKED, &sh->dev[i].flags); | |
1da177e4 | 2666 | set_bit(STRIPE_HANDLE, &sh->state); |
6d036f7d | 2667 | raid5_release_stripe(sh); |
59fc630b | 2668 | |
2669 | if (sh->batch_head && sh != sh->batch_head) | |
6d036f7d | 2670 | raid5_release_stripe(sh->batch_head); |
1da177e4 LT |
2671 | } |
2672 | ||
849674e4 | 2673 | static void raid5_error(struct mddev *mddev, struct md_rdev *rdev) |
1da177e4 LT |
2674 | { |
2675 | char b[BDEVNAME_SIZE]; | |
d1688a6d | 2676 | struct r5conf *conf = mddev->private; |
908f4fbd | 2677 | unsigned long flags; |
0c55e022 | 2678 | pr_debug("raid456: error called\n"); |
1da177e4 | 2679 | |
908f4fbd | 2680 | spin_lock_irqsave(&conf->device_lock, flags); |
aff69d89 | 2681 | set_bit(Faulty, &rdev->flags); |
908f4fbd | 2682 | clear_bit(In_sync, &rdev->flags); |
2e38a37f | 2683 | mddev->degraded = raid5_calc_degraded(conf); |
908f4fbd N |
2684 | spin_unlock_irqrestore(&conf->device_lock, flags); |
2685 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); | |
2686 | ||
de393cde | 2687 | set_bit(Blocked, &rdev->flags); |
2953079c SL |
2688 | set_mask_bits(&mddev->sb_flags, 0, |
2689 | BIT(MD_SB_CHANGE_DEVS) | BIT(MD_SB_CHANGE_PENDING)); | |
cc6167b4 N |
2690 | pr_crit("md/raid:%s: Disk failure on %s, disabling device.\n" |
2691 | "md/raid:%s: Operation continuing on %d devices.\n", | |
2692 | mdname(mddev), | |
2693 | bdevname(rdev->bdev, b), | |
2694 | mdname(mddev), | |
2695 | conf->raid_disks - mddev->degraded); | |
70d466f7 | 2696 | r5c_update_on_rdev_error(mddev, rdev); |
16a53ecc | 2697 | } |
1da177e4 LT |
2698 | |
2699 | /* | |
2700 | * Input: a 'big' sector number, | |
2701 | * Output: index of the data and parity disk, and the sector # in them. | |
2702 | */ | |
6d036f7d SL |
2703 | sector_t raid5_compute_sector(struct r5conf *conf, sector_t r_sector, |
2704 | int previous, int *dd_idx, | |
2705 | struct stripe_head *sh) | |
1da177e4 | 2706 | { |
6e3b96ed | 2707 | sector_t stripe, stripe2; |
35f2a591 | 2708 | sector_t chunk_number; |
1da177e4 | 2709 | unsigned int chunk_offset; |
911d4ee8 | 2710 | int pd_idx, qd_idx; |
67cc2b81 | 2711 | int ddf_layout = 0; |
1da177e4 | 2712 | sector_t new_sector; |
e183eaed N |
2713 | int algorithm = previous ? conf->prev_algo |
2714 | : conf->algorithm; | |
09c9e5fa AN |
2715 | int sectors_per_chunk = previous ? conf->prev_chunk_sectors |
2716 | : conf->chunk_sectors; | |
112bf897 N |
2717 | int raid_disks = previous ? conf->previous_raid_disks |
2718 | : conf->raid_disks; | |
2719 | int data_disks = raid_disks - conf->max_degraded; | |
1da177e4 LT |
2720 | |
2721 | /* First compute the information on this sector */ | |
2722 | ||
2723 | /* | |
2724 | * Compute the chunk number and the sector offset inside the chunk | |
2725 | */ | |
2726 | chunk_offset = sector_div(r_sector, sectors_per_chunk); | |
2727 | chunk_number = r_sector; | |
1da177e4 LT |
2728 | |
2729 | /* | |
2730 | * Compute the stripe number | |
2731 | */ | |
35f2a591 N |
2732 | stripe = chunk_number; |
2733 | *dd_idx = sector_div(stripe, data_disks); | |
6e3b96ed | 2734 | stripe2 = stripe; |
1da177e4 LT |
2735 | /* |
2736 | * Select the parity disk based on the user selected algorithm. | |
2737 | */ | |
84789554 | 2738 | pd_idx = qd_idx = -1; |
16a53ecc N |
2739 | switch(conf->level) { |
2740 | case 4: | |
911d4ee8 | 2741 | pd_idx = data_disks; |
16a53ecc N |
2742 | break; |
2743 | case 5: | |
e183eaed | 2744 | switch (algorithm) { |
1da177e4 | 2745 | case ALGORITHM_LEFT_ASYMMETRIC: |
6e3b96ed | 2746 | pd_idx = data_disks - sector_div(stripe2, raid_disks); |
911d4ee8 | 2747 | if (*dd_idx >= pd_idx) |
1da177e4 LT |
2748 | (*dd_idx)++; |
2749 | break; | |
2750 | case ALGORITHM_RIGHT_ASYMMETRIC: | |
6e3b96ed | 2751 | pd_idx = sector_div(stripe2, raid_disks); |
911d4ee8 | 2752 | if (*dd_idx >= pd_idx) |
1da177e4 LT |
2753 | (*dd_idx)++; |
2754 | break; | |
2755 | case ALGORITHM_LEFT_SYMMETRIC: | |
6e3b96ed | 2756 | pd_idx = data_disks - sector_div(stripe2, raid_disks); |
911d4ee8 | 2757 | *dd_idx = (pd_idx + 1 + *dd_idx) % raid_disks; |
1da177e4 LT |
2758 | break; |
2759 | case ALGORITHM_RIGHT_SYMMETRIC: | |
6e3b96ed | 2760 | pd_idx = sector_div(stripe2, raid_disks); |
911d4ee8 | 2761 | *dd_idx = (pd_idx + 1 + *dd_idx) % raid_disks; |
1da177e4 | 2762 | break; |
99c0fb5f N |
2763 | case ALGORITHM_PARITY_0: |
2764 | pd_idx = 0; | |
2765 | (*dd_idx)++; | |
2766 | break; | |
2767 | case ALGORITHM_PARITY_N: | |
2768 | pd_idx = data_disks; | |
2769 | break; | |
1da177e4 | 2770 | default: |
99c0fb5f | 2771 | BUG(); |
16a53ecc N |
2772 | } |
2773 | break; | |
2774 | case 6: | |
2775 | ||
e183eaed | 2776 | switch (algorithm) { |
16a53ecc | 2777 | case ALGORITHM_LEFT_ASYMMETRIC: |
6e3b96ed | 2778 | pd_idx = raid_disks - 1 - sector_div(stripe2, raid_disks); |
911d4ee8 N |
2779 | qd_idx = pd_idx + 1; |
2780 | if (pd_idx == raid_disks-1) { | |
99c0fb5f | 2781 | (*dd_idx)++; /* Q D D D P */ |
911d4ee8 N |
2782 | qd_idx = 0; |
2783 | } else if (*dd_idx >= pd_idx) | |
16a53ecc N |
2784 | (*dd_idx) += 2; /* D D P Q D */ |
2785 | break; | |
2786 | case ALGORITHM_RIGHT_ASYMMETRIC: | |
6e3b96ed | 2787 | pd_idx = sector_div(stripe2, raid_disks); |
911d4ee8 N |
2788 | qd_idx = pd_idx + 1; |
2789 | if (pd_idx == raid_disks-1) { | |
99c0fb5f | 2790 | (*dd_idx)++; /* Q D D D P */ |
911d4ee8 N |
2791 | qd_idx = 0; |
2792 | } else if (*dd_idx >= pd_idx) | |
16a53ecc N |
2793 | (*dd_idx) += 2; /* D D P Q D */ |
2794 | break; | |
2795 | case ALGORITHM_LEFT_SYMMETRIC: | |
6e3b96ed | 2796 | pd_idx = raid_disks - 1 - sector_div(stripe2, raid_disks); |
911d4ee8 N |
2797 | qd_idx = (pd_idx + 1) % raid_disks; |
2798 | *dd_idx = (pd_idx + 2 + *dd_idx) % raid_disks; | |
16a53ecc N |
2799 | break; |
2800 | case ALGORITHM_RIGHT_SYMMETRIC: | |
6e3b96ed | 2801 | pd_idx = sector_div(stripe2, raid_disks); |
911d4ee8 N |
2802 | qd_idx = (pd_idx + 1) % raid_disks; |
2803 | *dd_idx = (pd_idx + 2 + *dd_idx) % raid_disks; | |
16a53ecc | 2804 | break; |
99c0fb5f N |
2805 | |
2806 | case ALGORITHM_PARITY_0: | |
2807 | pd_idx = 0; | |
2808 | qd_idx = 1; | |
2809 | (*dd_idx) += 2; | |
2810 | break; | |
2811 | case ALGORITHM_PARITY_N: | |
2812 | pd_idx = data_disks; | |
2813 | qd_idx = data_disks + 1; | |
2814 | break; | |
2815 | ||
2816 | case ALGORITHM_ROTATING_ZERO_RESTART: | |
2817 | /* Exactly the same as RIGHT_ASYMMETRIC, but or | |
2818 | * of blocks for computing Q is different. | |
2819 | */ | |
6e3b96ed | 2820 | pd_idx = sector_div(stripe2, raid_disks); |
99c0fb5f N |
2821 | qd_idx = pd_idx + 1; |
2822 | if (pd_idx == raid_disks-1) { | |
2823 | (*dd_idx)++; /* Q D D D P */ | |
2824 | qd_idx = 0; | |
2825 | } else if (*dd_idx >= pd_idx) | |
2826 | (*dd_idx) += 2; /* D D P Q D */ | |
67cc2b81 | 2827 | ddf_layout = 1; |
99c0fb5f N |
2828 | break; |
2829 | ||
2830 | case ALGORITHM_ROTATING_N_RESTART: | |
2831 | /* Same a left_asymmetric, by first stripe is | |
2832 | * D D D P Q rather than | |
2833 | * Q D D D P | |
2834 | */ | |
6e3b96ed N |
2835 | stripe2 += 1; |
2836 | pd_idx = raid_disks - 1 - sector_div(stripe2, raid_disks); | |
99c0fb5f N |
2837 | qd_idx = pd_idx + 1; |
2838 | if (pd_idx == raid_disks-1) { | |
2839 | (*dd_idx)++; /* Q D D D P */ | |
2840 | qd_idx = 0; | |
2841 | } else if (*dd_idx >= pd_idx) | |
2842 | (*dd_idx) += 2; /* D D P Q D */ | |
67cc2b81 | 2843 | ddf_layout = 1; |
99c0fb5f N |
2844 | break; |
2845 | ||
2846 | case ALGORITHM_ROTATING_N_CONTINUE: | |
2847 | /* Same as left_symmetric but Q is before P */ | |
6e3b96ed | 2848 | pd_idx = raid_disks - 1 - sector_div(stripe2, raid_disks); |
99c0fb5f N |
2849 | qd_idx = (pd_idx + raid_disks - 1) % raid_disks; |
2850 | *dd_idx = (pd_idx + 1 + *dd_idx) % raid_disks; | |
67cc2b81 | 2851 | ddf_layout = 1; |
99c0fb5f N |
2852 | break; |
2853 | ||
2854 | case ALGORITHM_LEFT_ASYMMETRIC_6: | |
2855 | /* RAID5 left_asymmetric, with Q on last device */ | |
6e3b96ed | 2856 | pd_idx = data_disks - sector_div(stripe2, raid_disks-1); |
99c0fb5f N |
2857 | if (*dd_idx >= pd_idx) |
2858 | (*dd_idx)++; | |
2859 | qd_idx = raid_disks - 1; | |
2860 | break; | |
2861 | ||
2862 | case ALGORITHM_RIGHT_ASYMMETRIC_6: | |
6e3b96ed | 2863 | pd_idx = sector_div(stripe2, raid_disks-1); |
99c0fb5f N |
2864 | if (*dd_idx >= pd_idx) |
2865 | (*dd_idx)++; | |
2866 | qd_idx = raid_disks - 1; | |
2867 | break; | |
2868 | ||
2869 | case ALGORITHM_LEFT_SYMMETRIC_6: | |
6e3b96ed | 2870 | pd_idx = data_disks - sector_div(stripe2, raid_disks-1); |
99c0fb5f N |
2871 | *dd_idx = (pd_idx + 1 + *dd_idx) % (raid_disks-1); |
2872 | qd_idx = raid_disks - 1; | |
2873 | break; | |
2874 | ||
2875 | case ALGORITHM_RIGHT_SYMMETRIC_6: | |
6e3b96ed | 2876 | pd_idx = sector_div(stripe2, raid_disks-1); |
99c0fb5f N |
2877 | *dd_idx = (pd_idx + 1 + *dd_idx) % (raid_disks-1); |
2878 | qd_idx = raid_disks - 1; | |
2879 | break; | |
2880 | ||
2881 | case ALGORITHM_PARITY_0_6: | |
2882 | pd_idx = 0; | |
2883 | (*dd_idx)++; | |
2884 | qd_idx = raid_disks - 1; | |
2885 | break; | |
2886 | ||
16a53ecc | 2887 | default: |
99c0fb5f | 2888 | BUG(); |
16a53ecc N |
2889 | } |
2890 | break; | |
1da177e4 LT |
2891 | } |
2892 | ||
911d4ee8 N |
2893 | if (sh) { |
2894 | sh->pd_idx = pd_idx; | |
2895 | sh->qd_idx = qd_idx; | |
67cc2b81 | 2896 | sh->ddf_layout = ddf_layout; |
911d4ee8 | 2897 | } |
1da177e4 LT |
2898 | /* |
2899 | * Finally, compute the new sector number | |
2900 | */ | |
2901 | new_sector = (sector_t)stripe * sectors_per_chunk + chunk_offset; | |
2902 | return new_sector; | |
2903 | } | |
2904 | ||
6d036f7d | 2905 | sector_t raid5_compute_blocknr(struct stripe_head *sh, int i, int previous) |
1da177e4 | 2906 | { |
d1688a6d | 2907 | struct r5conf *conf = sh->raid_conf; |
b875e531 N |
2908 | int raid_disks = sh->disks; |
2909 | int data_disks = raid_disks - conf->max_degraded; | |
1da177e4 | 2910 | sector_t new_sector = sh->sector, check; |
09c9e5fa AN |
2911 | int sectors_per_chunk = previous ? conf->prev_chunk_sectors |
2912 | : conf->chunk_sectors; | |
e183eaed N |
2913 | int algorithm = previous ? conf->prev_algo |
2914 | : conf->algorithm; | |
1da177e4 LT |
2915 | sector_t stripe; |
2916 | int chunk_offset; | |
35f2a591 N |
2917 | sector_t chunk_number; |
2918 | int dummy1, dd_idx = i; | |
1da177e4 | 2919 | sector_t r_sector; |
911d4ee8 | 2920 | struct stripe_head sh2; |
1da177e4 LT |
2921 | |
2922 | chunk_offset = sector_div(new_sector, sectors_per_chunk); | |
2923 | stripe = new_sector; | |
1da177e4 | 2924 | |
16a53ecc N |
2925 | if (i == sh->pd_idx) |
2926 | return 0; | |
2927 | switch(conf->level) { | |
2928 | case 4: break; | |
2929 | case 5: | |
e183eaed | 2930 | switch (algorithm) { |
1da177e4 LT |
2931 | case ALGORITHM_LEFT_ASYMMETRIC: |
2932 | case ALGORITHM_RIGHT_ASYMMETRIC: | |
2933 | if (i > sh->pd_idx) | |
2934 | i--; | |
2935 | break; | |
2936 | case ALGORITHM_LEFT_SYMMETRIC: | |
2937 | case ALGORITHM_RIGHT_SYMMETRIC: | |
2938 | if (i < sh->pd_idx) | |
2939 | i += raid_disks; | |
2940 | i -= (sh->pd_idx + 1); | |
2941 | break; | |
99c0fb5f N |
2942 | case ALGORITHM_PARITY_0: |
2943 | i -= 1; | |
2944 | break; | |
2945 | case ALGORITHM_PARITY_N: | |
2946 | break; | |
1da177e4 | 2947 | default: |
99c0fb5f | 2948 | BUG(); |
16a53ecc N |
2949 | } |
2950 | break; | |
2951 | case 6: | |
d0dabf7e | 2952 | if (i == sh->qd_idx) |
16a53ecc | 2953 | return 0; /* It is the Q disk */ |
e183eaed | 2954 | switch (algorithm) { |
16a53ecc N |
2955 | case ALGORITHM_LEFT_ASYMMETRIC: |
2956 | case ALGORITHM_RIGHT_ASYMMETRIC: | |
99c0fb5f N |
2957 | case ALGORITHM_ROTATING_ZERO_RESTART: |
2958 | case ALGORITHM_ROTATING_N_RESTART: | |
2959 | if (sh->pd_idx == raid_disks-1) | |
2960 | i--; /* Q D D D P */ | |
16a53ecc N |
2961 | else if (i > sh->pd_idx) |
2962 | i -= 2; /* D D P Q D */ | |
2963 | break; | |
2964 | case ALGORITHM_LEFT_SYMMETRIC: | |
2965 | case ALGORITHM_RIGHT_SYMMETRIC: | |
2966 | if (sh->pd_idx == raid_disks-1) | |
2967 | i--; /* Q D D D P */ | |
2968 | else { | |
2969 | /* D D P Q D */ | |
2970 | if (i < sh->pd_idx) | |
2971 | i += raid_disks; | |
2972 | i -= (sh->pd_idx + 2); | |
2973 | } | |
2974 | break; | |
99c0fb5f N |
2975 | case ALGORITHM_PARITY_0: |
2976 | i -= 2; | |
2977 | break; | |
2978 | case ALGORITHM_PARITY_N: | |
2979 | break; | |
2980 | case ALGORITHM_ROTATING_N_CONTINUE: | |
e4424fee | 2981 | /* Like left_symmetric, but P is before Q */ |
99c0fb5f N |
2982 | if (sh->pd_idx == 0) |
2983 | i--; /* P D D D Q */ | |
e4424fee N |
2984 | else { |
2985 | /* D D Q P D */ | |
2986 | if (i < sh->pd_idx) | |
2987 | i += raid_disks; | |
2988 | i -= (sh->pd_idx + 1); | |
2989 | } | |
99c0fb5f N |
2990 | break; |
2991 | case ALGORITHM_LEFT_ASYMMETRIC_6: | |
2992 | case ALGORITHM_RIGHT_ASYMMETRIC_6: | |
2993 | if (i > sh->pd_idx) | |
2994 | i--; | |
2995 | break; | |
2996 | case ALGORITHM_LEFT_SYMMETRIC_6: | |
2997 | case ALGORITHM_RIGHT_SYMMETRIC_6: | |
2998 | if (i < sh->pd_idx) | |
2999 | i += data_disks + 1; | |
3000 | i -= (sh->pd_idx + 1); | |
3001 | break; | |
3002 | case ALGORITHM_PARITY_0_6: | |
3003 | i -= 1; | |
3004 | break; | |
16a53ecc | 3005 | default: |
99c0fb5f | 3006 | BUG(); |
16a53ecc N |
3007 | } |
3008 | break; | |
1da177e4 LT |
3009 | } |
3010 | ||
3011 | chunk_number = stripe * data_disks + i; | |
35f2a591 | 3012 | r_sector = chunk_number * sectors_per_chunk + chunk_offset; |
1da177e4 | 3013 | |
112bf897 | 3014 | check = raid5_compute_sector(conf, r_sector, |
784052ec | 3015 | previous, &dummy1, &sh2); |
911d4ee8 N |
3016 | if (check != sh->sector || dummy1 != dd_idx || sh2.pd_idx != sh->pd_idx |
3017 | || sh2.qd_idx != sh->qd_idx) { | |
cc6167b4 N |
3018 | pr_warn("md/raid:%s: compute_blocknr: map not correct\n", |
3019 | mdname(conf->mddev)); | |
1da177e4 LT |
3020 | return 0; |
3021 | } | |
3022 | return r_sector; | |
3023 | } | |
3024 | ||
07e83364 SL |
3025 | /* |
3026 | * There are cases where we want handle_stripe_dirtying() and | |
3027 | * schedule_reconstruction() to delay towrite to some dev of a stripe. | |
3028 | * | |
3029 | * This function checks whether we want to delay the towrite. Specifically, | |
3030 | * we delay the towrite when: | |
3031 | * | |
3032 | * 1. degraded stripe has a non-overwrite to the missing dev, AND this | |
3033 | * stripe has data in journal (for other devices). | |
3034 | * | |
3035 | * In this case, when reading data for the non-overwrite dev, it is | |
3036 | * necessary to handle complex rmw of write back cache (prexor with | |
3037 | * orig_page, and xor with page). To keep read path simple, we would | |
3038 | * like to flush data in journal to RAID disks first, so complex rmw | |
3039 | * is handled in the write patch (handle_stripe_dirtying). | |
3040 | * | |
39b99586 SL |
3041 | * 2. when journal space is critical (R5C_LOG_CRITICAL=1) |
3042 | * | |
3043 | * It is important to be able to flush all stripes in raid5-cache. | |
3044 | * Therefore, we need reserve some space on the journal device for | |
3045 | * these flushes. If flush operation includes pending writes to the | |
3046 | * stripe, we need to reserve (conf->raid_disk + 1) pages per stripe | |
3047 | * for the flush out. If we exclude these pending writes from flush | |
3048 | * operation, we only need (conf->max_degraded + 1) pages per stripe. | |
3049 | * Therefore, excluding pending writes in these cases enables more | |
3050 | * efficient use of the journal device. | |
3051 | * | |
3052 | * Note: To make sure the stripe makes progress, we only delay | |
3053 | * towrite for stripes with data already in journal (injournal > 0). | |
3054 | * When LOG_CRITICAL, stripes with injournal == 0 will be sent to | |
3055 | * no_space_stripes list. | |
3056 | * | |
70d466f7 SL |
3057 | * 3. during journal failure |
3058 | * In journal failure, we try to flush all cached data to raid disks | |
3059 | * based on data in stripe cache. The array is read-only to upper | |
3060 | * layers, so we would skip all pending writes. | |
3061 | * | |
07e83364 | 3062 | */ |
39b99586 SL |
3063 | static inline bool delay_towrite(struct r5conf *conf, |
3064 | struct r5dev *dev, | |
3065 | struct stripe_head_state *s) | |
07e83364 | 3066 | { |
39b99586 SL |
3067 | /* case 1 above */ |
3068 | if (!test_bit(R5_OVERWRITE, &dev->flags) && | |
3069 | !test_bit(R5_Insync, &dev->flags) && s->injournal) | |
3070 | return true; | |
3071 | /* case 2 above */ | |
3072 | if (test_bit(R5C_LOG_CRITICAL, &conf->cache_state) && | |
3073 | s->injournal > 0) | |
3074 | return true; | |
70d466f7 SL |
3075 | /* case 3 above */ |
3076 | if (s->log_failed && s->injournal) | |
3077 | return true; | |
39b99586 | 3078 | return false; |
07e83364 SL |
3079 | } |
3080 | ||
600aa109 | 3081 | static void |
c0f7bddb | 3082 | schedule_reconstruction(struct stripe_head *sh, struct stripe_head_state *s, |
600aa109 | 3083 | int rcw, int expand) |
e33129d8 | 3084 | { |
584acdd4 | 3085 | int i, pd_idx = sh->pd_idx, qd_idx = sh->qd_idx, disks = sh->disks; |
d1688a6d | 3086 | struct r5conf *conf = sh->raid_conf; |
c0f7bddb | 3087 | int level = conf->level; |
e33129d8 DW |
3088 | |
3089 | if (rcw) { | |
1e6d690b SL |
3090 | /* |
3091 | * In some cases, handle_stripe_dirtying initially decided to | |
3092 | * run rmw and allocates extra page for prexor. However, rcw is | |
3093 | * cheaper later on. We need to free the extra page now, | |
3094 | * because we won't be able to do that in ops_complete_prexor(). | |
3095 | */ | |
3096 | r5c_release_extra_page(sh); | |
e33129d8 DW |
3097 | |
3098 | for (i = disks; i--; ) { | |
3099 | struct r5dev *dev = &sh->dev[i]; | |
3100 | ||
39b99586 | 3101 | if (dev->towrite && !delay_towrite(conf, dev, s)) { |
e33129d8 | 3102 | set_bit(R5_LOCKED, &dev->flags); |
d8ee0728 | 3103 | set_bit(R5_Wantdrain, &dev->flags); |
e33129d8 DW |
3104 | if (!expand) |
3105 | clear_bit(R5_UPTODATE, &dev->flags); | |
600aa109 | 3106 | s->locked++; |
1e6d690b SL |
3107 | } else if (test_bit(R5_InJournal, &dev->flags)) { |
3108 | set_bit(R5_LOCKED, &dev->flags); | |
3109 | s->locked++; | |
e33129d8 DW |
3110 | } |
3111 | } | |
ce7d363a N |
3112 | /* if we are not expanding this is a proper write request, and |
3113 | * there will be bios with new data to be drained into the | |
3114 | * stripe cache | |
3115 | */ | |
3116 | if (!expand) { | |
3117 | if (!s->locked) | |
3118 | /* False alarm, nothing to do */ | |
3119 | return; | |
3120 | sh->reconstruct_state = reconstruct_state_drain_run; | |
3121 | set_bit(STRIPE_OP_BIODRAIN, &s->ops_request); | |
3122 | } else | |
3123 | sh->reconstruct_state = reconstruct_state_run; | |
3124 | ||
3125 | set_bit(STRIPE_OP_RECONSTRUCT, &s->ops_request); | |
3126 | ||
c0f7bddb | 3127 | if (s->locked + conf->max_degraded == disks) |
8b3e6cdc | 3128 | if (!test_and_set_bit(STRIPE_FULL_WRITE, &sh->state)) |
c0f7bddb | 3129 | atomic_inc(&conf->pending_full_writes); |
e33129d8 DW |
3130 | } else { |
3131 | BUG_ON(!(test_bit(R5_UPTODATE, &sh->dev[pd_idx].flags) || | |
3132 | test_bit(R5_Wantcompute, &sh->dev[pd_idx].flags))); | |
584acdd4 MS |
3133 | BUG_ON(level == 6 && |
3134 | (!(test_bit(R5_UPTODATE, &sh->dev[qd_idx].flags) || | |
3135 | test_bit(R5_Wantcompute, &sh->dev[qd_idx].flags)))); | |
e33129d8 | 3136 | |
e33129d8 DW |
3137 | for (i = disks; i--; ) { |
3138 | struct r5dev *dev = &sh->dev[i]; | |
584acdd4 | 3139 | if (i == pd_idx || i == qd_idx) |
e33129d8 DW |
3140 | continue; |
3141 | ||
e33129d8 DW |
3142 | if (dev->towrite && |
3143 | (test_bit(R5_UPTODATE, &dev->flags) || | |
d8ee0728 DW |
3144 | test_bit(R5_Wantcompute, &dev->flags))) { |
3145 | set_bit(R5_Wantdrain, &dev->flags); | |
e33129d8 DW |
3146 | set_bit(R5_LOCKED, &dev->flags); |
3147 | clear_bit(R5_UPTODATE, &dev->flags); | |
600aa109 | 3148 | s->locked++; |
1e6d690b SL |
3149 | } else if (test_bit(R5_InJournal, &dev->flags)) { |
3150 | set_bit(R5_LOCKED, &dev->flags); | |
3151 | s->locked++; | |
e33129d8 DW |
3152 | } |
3153 | } | |
ce7d363a N |
3154 | if (!s->locked) |
3155 | /* False alarm - nothing to do */ | |
3156 | return; | |
3157 | sh->reconstruct_state = reconstruct_state_prexor_drain_run; | |
3158 | set_bit(STRIPE_OP_PREXOR, &s->ops_request); | |
3159 | set_bit(STRIPE_OP_BIODRAIN, &s->ops_request); | |
3160 | set_bit(STRIPE_OP_RECONSTRUCT, &s->ops_request); | |
e33129d8 DW |
3161 | } |
3162 | ||
c0f7bddb | 3163 | /* keep the parity disk(s) locked while asynchronous operations |
e33129d8 DW |
3164 | * are in flight |
3165 | */ | |
3166 | set_bit(R5_LOCKED, &sh->dev[pd_idx].flags); | |
3167 | clear_bit(R5_UPTODATE, &sh->dev[pd_idx].flags); | |
600aa109 | 3168 | s->locked++; |
e33129d8 | 3169 | |
c0f7bddb YT |
3170 | if (level == 6) { |
3171 | int qd_idx = sh->qd_idx; | |
3172 | struct r5dev *dev = &sh->dev[qd_idx]; | |
3173 | ||
3174 | set_bit(R5_LOCKED, &dev->flags); | |
3175 | clear_bit(R5_UPTODATE, &dev->flags); | |
3176 | s->locked++; | |
3177 | } | |
3178 | ||
845b9e22 | 3179 | if (raid5_has_ppl(sh->raid_conf) && sh->ppl_page && |
3418d036 AP |
3180 | test_bit(STRIPE_OP_BIODRAIN, &s->ops_request) && |
3181 | !test_bit(STRIPE_FULL_WRITE, &sh->state) && | |
3182 | test_bit(R5_Insync, &sh->dev[pd_idx].flags)) | |
3183 | set_bit(STRIPE_OP_PARTIAL_PARITY, &s->ops_request); | |
3184 | ||
600aa109 | 3185 | pr_debug("%s: stripe %llu locked: %d ops_request: %lx\n", |
e46b272b | 3186 | __func__, (unsigned long long)sh->sector, |
600aa109 | 3187 | s->locked, s->ops_request); |
e33129d8 | 3188 | } |
16a53ecc | 3189 | |
1da177e4 LT |
3190 | /* |
3191 | * Each stripe/dev can have one or more bion attached. | |
16a53ecc | 3192 | * toread/towrite point to the first in a chain. |
1da177e4 LT |
3193 | * The bi_next chain must be in order. |
3194 | */ | |
da41ba65 | 3195 | static int add_stripe_bio(struct stripe_head *sh, struct bio *bi, int dd_idx, |
3196 | int forwrite, int previous) | |
1da177e4 LT |
3197 | { |
3198 | struct bio **bip; | |
d1688a6d | 3199 | struct r5conf *conf = sh->raid_conf; |
72626685 | 3200 | int firstwrite=0; |
1da177e4 | 3201 | |
cbe47ec5 | 3202 | pr_debug("adding bi b#%llu to stripe s#%llu\n", |
4f024f37 | 3203 | (unsigned long long)bi->bi_iter.bi_sector, |
1da177e4 LT |
3204 | (unsigned long long)sh->sector); |
3205 | ||
b17459c0 | 3206 | spin_lock_irq(&sh->stripe_lock); |
59fc630b | 3207 | /* Don't allow new IO added to stripes in batch list */ |
3208 | if (sh->batch_head) | |
3209 | goto overlap; | |
72626685 | 3210 | if (forwrite) { |
1da177e4 | 3211 | bip = &sh->dev[dd_idx].towrite; |
7eaf7e8e | 3212 | if (*bip == NULL) |
72626685 N |
3213 | firstwrite = 1; |
3214 | } else | |
1da177e4 | 3215 | bip = &sh->dev[dd_idx].toread; |
4f024f37 KO |
3216 | while (*bip && (*bip)->bi_iter.bi_sector < bi->bi_iter.bi_sector) { |
3217 | if (bio_end_sector(*bip) > bi->bi_iter.bi_sector) | |
1da177e4 LT |
3218 | goto overlap; |
3219 | bip = & (*bip)->bi_next; | |
3220 | } | |
4f024f37 | 3221 | if (*bip && (*bip)->bi_iter.bi_sector < bio_end_sector(bi)) |
1da177e4 LT |
3222 | goto overlap; |
3223 | ||
3418d036 AP |
3224 | if (forwrite && raid5_has_ppl(conf)) { |
3225 | /* | |
3226 | * With PPL only writes to consecutive data chunks within a | |
3227 | * stripe are allowed because for a single stripe_head we can | |
3228 | * only have one PPL entry at a time, which describes one data | |
3229 | * range. Not really an overlap, but wait_for_overlap can be | |
3230 | * used to handle this. | |
3231 | */ | |
3232 | sector_t sector; | |
3233 | sector_t first = 0; | |
3234 | sector_t last = 0; | |
3235 | int count = 0; | |
3236 | int i; | |
3237 | ||
3238 | for (i = 0; i < sh->disks; i++) { | |
3239 | if (i != sh->pd_idx && | |
3240 | (i == dd_idx || sh->dev[i].towrite)) { | |
3241 | sector = sh->dev[i].sector; | |
3242 | if (count == 0 || sector < first) | |
3243 | first = sector; | |
3244 | if (sector > last) | |
3245 | last = sector; | |
3246 | count++; | |
3247 | } | |
3248 | } | |
3249 | ||
3250 | if (first + conf->chunk_sectors * (count - 1) != last) | |
3251 | goto overlap; | |
3252 | } | |
3253 | ||
da41ba65 | 3254 | if (!forwrite || previous) |
3255 | clear_bit(STRIPE_BATCH_READY, &sh->state); | |
3256 | ||
78bafebd | 3257 | BUG_ON(*bip && bi->bi_next && (*bip) != bi->bi_next); |
1da177e4 LT |
3258 | if (*bip) |
3259 | bi->bi_next = *bip; | |
3260 | *bip = bi; | |
016c76ac | 3261 | bio_inc_remaining(bi); |
49728050 | 3262 | md_write_inc(conf->mddev, bi); |
72626685 | 3263 | |
1da177e4 LT |
3264 | if (forwrite) { |
3265 | /* check if page is covered */ | |
3266 | sector_t sector = sh->dev[dd_idx].sector; | |
3267 | for (bi=sh->dev[dd_idx].towrite; | |
3268 | sector < sh->dev[dd_idx].sector + STRIPE_SECTORS && | |
4f024f37 | 3269 | bi && bi->bi_iter.bi_sector <= sector; |
1da177e4 | 3270 | bi = r5_next_bio(bi, sh->dev[dd_idx].sector)) { |
f73a1c7d KO |
3271 | if (bio_end_sector(bi) >= sector) |
3272 | sector = bio_end_sector(bi); | |
1da177e4 LT |
3273 | } |
3274 | if (sector >= sh->dev[dd_idx].sector + STRIPE_SECTORS) | |
7a87f434 | 3275 | if (!test_and_set_bit(R5_OVERWRITE, &sh->dev[dd_idx].flags)) |
3276 | sh->overwrite_disks++; | |
1da177e4 | 3277 | } |
cbe47ec5 N |
3278 | |
3279 | pr_debug("added bi b#%llu to stripe s#%llu, disk %d.\n", | |
4f024f37 | 3280 | (unsigned long long)(*bip)->bi_iter.bi_sector, |
cbe47ec5 N |
3281 | (unsigned long long)sh->sector, dd_idx); |
3282 | ||
3283 | if (conf->mddev->bitmap && firstwrite) { | |
d0852df5 N |
3284 | /* Cannot hold spinlock over bitmap_startwrite, |
3285 | * but must ensure this isn't added to a batch until | |
3286 | * we have added to the bitmap and set bm_seq. | |
3287 | * So set STRIPE_BITMAP_PENDING to prevent | |
3288 | * batching. | |
3289 | * If multiple add_stripe_bio() calls race here they | |
3290 | * much all set STRIPE_BITMAP_PENDING. So only the first one | |
3291 | * to complete "bitmap_startwrite" gets to set | |
3292 | * STRIPE_BIT_DELAY. This is important as once a stripe | |
3293 | * is added to a batch, STRIPE_BIT_DELAY cannot be changed | |
3294 | * any more. | |
3295 | */ | |
3296 | set_bit(STRIPE_BITMAP_PENDING, &sh->state); | |
3297 | spin_unlock_irq(&sh->stripe_lock); | |
cbe47ec5 N |
3298 | bitmap_startwrite(conf->mddev->bitmap, sh->sector, |
3299 | STRIPE_SECTORS, 0); | |
d0852df5 N |
3300 | spin_lock_irq(&sh->stripe_lock); |
3301 | clear_bit(STRIPE_BITMAP_PENDING, &sh->state); | |
3302 | if (!sh->batch_head) { | |
3303 | sh->bm_seq = conf->seq_flush+1; | |
3304 | set_bit(STRIPE_BIT_DELAY, &sh->state); | |
3305 | } | |
cbe47ec5 | 3306 | } |
d0852df5 | 3307 | spin_unlock_irq(&sh->stripe_lock); |
59fc630b | 3308 | |
3309 | if (stripe_can_batch(sh)) | |
3310 | stripe_add_to_batch_list(conf, sh); | |
1da177e4 LT |
3311 | return 1; |
3312 | ||
3313 | overlap: | |
3314 | set_bit(R5_Overlap, &sh->dev[dd_idx].flags); | |
b17459c0 | 3315 | spin_unlock_irq(&sh->stripe_lock); |
1da177e4 LT |
3316 | return 0; |
3317 | } | |
3318 | ||
d1688a6d | 3319 | static void end_reshape(struct r5conf *conf); |
29269553 | 3320 | |
d1688a6d | 3321 | static void stripe_set_idx(sector_t stripe, struct r5conf *conf, int previous, |
911d4ee8 | 3322 | struct stripe_head *sh) |
ccfcc3c1 | 3323 | { |
784052ec | 3324 | int sectors_per_chunk = |
09c9e5fa | 3325 | previous ? conf->prev_chunk_sectors : conf->chunk_sectors; |
911d4ee8 | 3326 | int dd_idx; |
2d2063ce | 3327 | int chunk_offset = sector_div(stripe, sectors_per_chunk); |
112bf897 | 3328 | int disks = previous ? conf->previous_raid_disks : conf->raid_disks; |
2d2063ce | 3329 | |
112bf897 N |
3330 | raid5_compute_sector(conf, |
3331 | stripe * (disks - conf->max_degraded) | |
b875e531 | 3332 | *sectors_per_chunk + chunk_offset, |
112bf897 | 3333 | previous, |
911d4ee8 | 3334 | &dd_idx, sh); |
ccfcc3c1 N |
3335 | } |
3336 | ||
a4456856 | 3337 | static void |
d1688a6d | 3338 | handle_failed_stripe(struct r5conf *conf, struct stripe_head *sh, |
bd83d0a2 | 3339 | struct stripe_head_state *s, int disks) |
a4456856 DW |
3340 | { |
3341 | int i; | |
59fc630b | 3342 | BUG_ON(sh->batch_head); |
a4456856 DW |
3343 | for (i = disks; i--; ) { |
3344 | struct bio *bi; | |
3345 | int bitmap_end = 0; | |
3346 | ||
3347 | if (test_bit(R5_ReadError, &sh->dev[i].flags)) { | |
3cb03002 | 3348 | struct md_rdev *rdev; |
a4456856 DW |
3349 | rcu_read_lock(); |
3350 | rdev = rcu_dereference(conf->disks[i].rdev); | |
f5b67ae8 N |
3351 | if (rdev && test_bit(In_sync, &rdev->flags) && |
3352 | !test_bit(Faulty, &rdev->flags)) | |
7f0da59b N |
3353 | atomic_inc(&rdev->nr_pending); |
3354 | else | |
3355 | rdev = NULL; | |
a4456856 | 3356 | rcu_read_unlock(); |
7f0da59b N |
3357 | if (rdev) { |
3358 | if (!rdev_set_badblocks( | |
3359 | rdev, | |
3360 | sh->sector, | |
3361 | STRIPE_SECTORS, 0)) | |
3362 | md_error(conf->mddev, rdev); | |
3363 | rdev_dec_pending(rdev, conf->mddev); | |
3364 | } | |
a4456856 | 3365 | } |
b17459c0 | 3366 | spin_lock_irq(&sh->stripe_lock); |
a4456856 DW |
3367 | /* fail all writes first */ |
3368 | bi = sh->dev[i].towrite; | |
3369 | sh->dev[i].towrite = NULL; | |
7a87f434 | 3370 | sh->overwrite_disks = 0; |
b17459c0 | 3371 | spin_unlock_irq(&sh->stripe_lock); |
1ed850f3 | 3372 | if (bi) |
a4456856 | 3373 | bitmap_end = 1; |
a4456856 | 3374 | |
ff875738 | 3375 | log_stripe_write_finished(sh); |
0576b1c6 | 3376 | |
a4456856 DW |
3377 | if (test_and_clear_bit(R5_Overlap, &sh->dev[i].flags)) |
3378 | wake_up(&conf->wait_for_overlap); | |
3379 | ||
4f024f37 | 3380 | while (bi && bi->bi_iter.bi_sector < |
a4456856 DW |
3381 | sh->dev[i].sector + STRIPE_SECTORS) { |
3382 | struct bio *nextbi = r5_next_bio(bi, sh->dev[i].sector); | |
4246a0b6 | 3383 | |
49728050 | 3384 | md_write_end(conf->mddev); |
6308d8e3 | 3385 | bio_io_error(bi); |
a4456856 DW |
3386 | bi = nextbi; |
3387 | } | |
7eaf7e8e SL |
3388 | if (bitmap_end) |
3389 | bitmap_endwrite(conf->mddev->bitmap, sh->sector, | |
3390 | STRIPE_SECTORS, 0, 0); | |
3391 | bitmap_end = 0; | |
a4456856 DW |
3392 | /* and fail all 'written' */ |
3393 | bi = sh->dev[i].written; | |
3394 | sh->dev[i].written = NULL; | |
d592a996 SL |
3395 | if (test_and_clear_bit(R5_SkipCopy, &sh->dev[i].flags)) { |
3396 | WARN_ON(test_bit(R5_UPTODATE, &sh->dev[i].flags)); | |
3397 | sh->dev[i].page = sh->dev[i].orig_page; | |
3398 | } | |
3399 | ||
a4456856 | 3400 | if (bi) bitmap_end = 1; |
4f024f37 | 3401 | while (bi && bi->bi_iter.bi_sector < |
a4456856 DW |
3402 | sh->dev[i].sector + STRIPE_SECTORS) { |
3403 | struct bio *bi2 = r5_next_bio(bi, sh->dev[i].sector); | |
4246a0b6 | 3404 | |
49728050 | 3405 | md_write_end(conf->mddev); |
6308d8e3 | 3406 | bio_io_error(bi); |
a4456856 DW |
3407 | bi = bi2; |
3408 | } | |
3409 | ||
b5e98d65 DW |
3410 | /* fail any reads if this device is non-operational and |
3411 | * the data has not reached the cache yet. | |
3412 | */ | |
3413 | if (!test_bit(R5_Wantfill, &sh->dev[i].flags) && | |
6e74a9cf | 3414 | s->failed > conf->max_degraded && |
b5e98d65 DW |
3415 | (!test_bit(R5_Insync, &sh->dev[i].flags) || |
3416 | test_bit(R5_ReadError, &sh->dev[i].flags))) { | |
143c4d05 | 3417 | spin_lock_irq(&sh->stripe_lock); |
a4456856 DW |
3418 | bi = sh->dev[i].toread; |
3419 | sh->dev[i].toread = NULL; | |
143c4d05 | 3420 | spin_unlock_irq(&sh->stripe_lock); |
a4456856 DW |
3421 | if (test_and_clear_bit(R5_Overlap, &sh->dev[i].flags)) |
3422 | wake_up(&conf->wait_for_overlap); | |
ebda780b SL |
3423 | if (bi) |
3424 | s->to_read--; | |
4f024f37 | 3425 | while (bi && bi->bi_iter.bi_sector < |
a4456856 DW |
3426 | sh->dev[i].sector + STRIPE_SECTORS) { |
3427 | struct bio *nextbi = | |
3428 | r5_next_bio(bi, sh->dev[i].sector); | |
4246a0b6 | 3429 | |
6308d8e3 | 3430 | bio_io_error(bi); |
a4456856 DW |
3431 | bi = nextbi; |
3432 | } | |
3433 | } | |
a4456856 DW |
3434 | if (bitmap_end) |
3435 | bitmap_endwrite(conf->mddev->bitmap, sh->sector, | |
3436 | STRIPE_SECTORS, 0, 0); | |
8cfa7b0f N |
3437 | /* If we were in the middle of a write the parity block might |
3438 | * still be locked - so just clear all R5_LOCKED flags | |
3439 | */ | |
3440 | clear_bit(R5_LOCKED, &sh->dev[i].flags); | |
a4456856 | 3441 | } |
ebda780b SL |
3442 | s->to_write = 0; |
3443 | s->written = 0; | |
a4456856 | 3444 | |
8b3e6cdc DW |
3445 | if (test_and_clear_bit(STRIPE_FULL_WRITE, &sh->state)) |
3446 | if (atomic_dec_and_test(&conf->pending_full_writes)) | |
3447 | md_wakeup_thread(conf->mddev->thread); | |
a4456856 DW |
3448 | } |
3449 | ||
7f0da59b | 3450 | static void |
d1688a6d | 3451 | handle_failed_sync(struct r5conf *conf, struct stripe_head *sh, |
7f0da59b N |
3452 | struct stripe_head_state *s) |
3453 | { | |
3454 | int abort = 0; | |
3455 | int i; | |
3456 | ||
59fc630b | 3457 | BUG_ON(sh->batch_head); |
7f0da59b | 3458 | clear_bit(STRIPE_SYNCING, &sh->state); |
f8dfcffd N |
3459 | if (test_and_clear_bit(R5_Overlap, &sh->dev[sh->pd_idx].flags)) |
3460 | wake_up(&conf->wait_for_overlap); | |
7f0da59b | 3461 | s->syncing = 0; |
9a3e1101 | 3462 | s->replacing = 0; |
7f0da59b | 3463 | /* There is nothing more to do for sync/check/repair. |
18b9837e N |
3464 | * Don't even need to abort as that is handled elsewhere |
3465 | * if needed, and not always wanted e.g. if there is a known | |
3466 | * bad block here. | |
9a3e1101 | 3467 | * For recover/replace we need to record a bad block on all |
7f0da59b N |
3468 | * non-sync devices, or abort the recovery |
3469 | */ | |
18b9837e N |
3470 | if (test_bit(MD_RECOVERY_RECOVER, &conf->mddev->recovery)) { |
3471 | /* During recovery devices cannot be removed, so | |
3472 | * locking and refcounting of rdevs is not needed | |
3473 | */ | |
e50d3992 | 3474 | rcu_read_lock(); |
18b9837e | 3475 | for (i = 0; i < conf->raid_disks; i++) { |
e50d3992 | 3476 | struct md_rdev *rdev = rcu_dereference(conf->disks[i].rdev); |
18b9837e N |
3477 | if (rdev |
3478 | && !test_bit(Faulty, &rdev->flags) | |
3479 | && !test_bit(In_sync, &rdev->flags) | |
3480 | && !rdev_set_badblocks(rdev, sh->sector, | |
3481 | STRIPE_SECTORS, 0)) | |
3482 | abort = 1; | |
e50d3992 | 3483 | rdev = rcu_dereference(conf->disks[i].replacement); |
18b9837e N |
3484 | if (rdev |
3485 | && !test_bit(Faulty, &rdev->flags) | |
3486 | && !test_bit(In_sync, &rdev->flags) | |
3487 | && !rdev_set_badblocks(rdev, sh->sector, | |
3488 | STRIPE_SECTORS, 0)) | |
3489 | abort = 1; | |
3490 | } | |
e50d3992 | 3491 | rcu_read_unlock(); |
18b9837e N |
3492 | if (abort) |
3493 | conf->recovery_disabled = | |
3494 | conf->mddev->recovery_disabled; | |
7f0da59b | 3495 | } |
18b9837e | 3496 | md_done_sync(conf->mddev, STRIPE_SECTORS, !abort); |
7f0da59b N |
3497 | } |
3498 | ||
9a3e1101 N |
3499 | static int want_replace(struct stripe_head *sh, int disk_idx) |
3500 | { | |
3501 | struct md_rdev *rdev; | |
3502 | int rv = 0; | |
3f232d6a N |
3503 | |
3504 | rcu_read_lock(); | |
3505 | rdev = rcu_dereference(sh->raid_conf->disks[disk_idx].replacement); | |
9a3e1101 N |
3506 | if (rdev |
3507 | && !test_bit(Faulty, &rdev->flags) | |
3508 | && !test_bit(In_sync, &rdev->flags) | |
3509 | && (rdev->recovery_offset <= sh->sector | |
3510 | || rdev->mddev->recovery_cp <= sh->sector)) | |
3511 | rv = 1; | |
3f232d6a | 3512 | rcu_read_unlock(); |
9a3e1101 N |
3513 | return rv; |
3514 | } | |
3515 | ||
2c58f06e N |
3516 | static int need_this_block(struct stripe_head *sh, struct stripe_head_state *s, |
3517 | int disk_idx, int disks) | |
a4456856 | 3518 | { |
5599becc | 3519 | struct r5dev *dev = &sh->dev[disk_idx]; |
f2b3b44d N |
3520 | struct r5dev *fdev[2] = { &sh->dev[s->failed_num[0]], |
3521 | &sh->dev[s->failed_num[1]] }; | |
ea664c82 | 3522 | int i; |
5599becc | 3523 | |
a79cfe12 N |
3524 | |
3525 | if (test_bit(R5_LOCKED, &dev->flags) || | |
3526 | test_bit(R5_UPTODATE, &dev->flags)) | |
3527 | /* No point reading this as we already have it or have | |
3528 | * decided to get it. | |
3529 | */ | |
3530 | return 0; | |
3531 | ||
3532 | if (dev->toread || | |
3533 | (dev->towrite && !test_bit(R5_OVERWRITE, &dev->flags))) | |
3534 | /* We need this block to directly satisfy a request */ | |
3535 | return 1; | |
3536 | ||
3537 | if (s->syncing || s->expanding || | |
3538 | (s->replacing && want_replace(sh, disk_idx))) | |
3539 | /* When syncing, or expanding we read everything. | |
3540 | * When replacing, we need the replaced block. | |
3541 | */ | |
3542 | return 1; | |
3543 | ||
3544 | if ((s->failed >= 1 && fdev[0]->toread) || | |
3545 | (s->failed >= 2 && fdev[1]->toread)) | |
3546 | /* If we want to read from a failed device, then | |
3547 | * we need to actually read every other device. | |
3548 | */ | |
3549 | return 1; | |
3550 | ||
a9d56950 N |
3551 | /* Sometimes neither read-modify-write nor reconstruct-write |
3552 | * cycles can work. In those cases we read every block we | |
3553 | * can. Then the parity-update is certain to have enough to | |
3554 | * work with. | |
3555 | * This can only be a problem when we need to write something, | |
3556 | * and some device has failed. If either of those tests | |
3557 | * fail we need look no further. | |
3558 | */ | |
3559 | if (!s->failed || !s->to_write) | |
3560 | return 0; | |
3561 | ||
3562 | if (test_bit(R5_Insync, &dev->flags) && | |
3563 | !test_bit(STRIPE_PREREAD_ACTIVE, &sh->state)) | |
3564 | /* Pre-reads at not permitted until after short delay | |
3565 | * to gather multiple requests. However if this | |
3560741e | 3566 | * device is no Insync, the block could only be computed |
a9d56950 N |
3567 | * and there is no need to delay that. |
3568 | */ | |
3569 | return 0; | |
ea664c82 | 3570 | |
36707bb2 | 3571 | for (i = 0; i < s->failed && i < 2; i++) { |
ea664c82 N |
3572 | if (fdev[i]->towrite && |
3573 | !test_bit(R5_UPTODATE, &fdev[i]->flags) && | |
3574 | !test_bit(R5_OVERWRITE, &fdev[i]->flags)) | |
3575 | /* If we have a partial write to a failed | |
3576 | * device, then we will need to reconstruct | |
3577 | * the content of that device, so all other | |
3578 | * devices must be read. | |
3579 | */ | |
3580 | return 1; | |
3581 | } | |
3582 | ||
3583 | /* If we are forced to do a reconstruct-write, either because | |
3584 | * the current RAID6 implementation only supports that, or | |
3560741e | 3585 | * because parity cannot be trusted and we are currently |
ea664c82 N |
3586 | * recovering it, there is extra need to be careful. |
3587 | * If one of the devices that we would need to read, because | |
3588 | * it is not being overwritten (and maybe not written at all) | |
3589 | * is missing/faulty, then we need to read everything we can. | |
3590 | */ | |
3591 | if (sh->raid_conf->level != 6 && | |
3592 | sh->sector < sh->raid_conf->mddev->recovery_cp) | |
3593 | /* reconstruct-write isn't being forced */ | |
3594 | return 0; | |
36707bb2 | 3595 | for (i = 0; i < s->failed && i < 2; i++) { |
10d82c5f N |
3596 | if (s->failed_num[i] != sh->pd_idx && |
3597 | s->failed_num[i] != sh->qd_idx && | |
3598 | !test_bit(R5_UPTODATE, &fdev[i]->flags) && | |
ea664c82 N |
3599 | !test_bit(R5_OVERWRITE, &fdev[i]->flags)) |
3600 | return 1; | |
3601 | } | |
3602 | ||
2c58f06e N |
3603 | return 0; |
3604 | } | |
3605 | ||
ba02684d SL |
3606 | /* fetch_block - checks the given member device to see if its data needs |
3607 | * to be read or computed to satisfy a request. | |
3608 | * | |
3609 | * Returns 1 when no more member devices need to be checked, otherwise returns | |
3610 | * 0 to tell the loop in handle_stripe_fill to continue | |
3611 | */ | |
2c58f06e N |
3612 | static int fetch_block(struct stripe_head *sh, struct stripe_head_state *s, |
3613 | int disk_idx, int disks) | |
3614 | { | |
3615 | struct r5dev *dev = &sh->dev[disk_idx]; | |
3616 | ||
3617 | /* is the data in this block needed, and can we get it? */ | |
3618 | if (need_this_block(sh, s, disk_idx, disks)) { | |
5599becc YT |
3619 | /* we would like to get this block, possibly by computing it, |
3620 | * otherwise read it if the backing disk is insync | |
3621 | */ | |
3622 | BUG_ON(test_bit(R5_Wantcompute, &dev->flags)); | |
3623 | BUG_ON(test_bit(R5_Wantread, &dev->flags)); | |
b0c783b3 | 3624 | BUG_ON(sh->batch_head); |
7471fb77 N |
3625 | |
3626 | /* | |
3627 | * In the raid6 case if the only non-uptodate disk is P | |
3628 | * then we already trusted P to compute the other failed | |
3629 | * drives. It is safe to compute rather than re-read P. | |
3630 | * In other cases we only compute blocks from failed | |
3631 | * devices, otherwise check/repair might fail to detect | |
3632 | * a real inconsistency. | |
3633 | */ | |
3634 | ||
5599becc | 3635 | if ((s->uptodate == disks - 1) && |
7471fb77 | 3636 | ((sh->qd_idx >= 0 && sh->pd_idx == disk_idx) || |
f2b3b44d | 3637 | (s->failed && (disk_idx == s->failed_num[0] || |
7471fb77 | 3638 | disk_idx == s->failed_num[1])))) { |
5599becc YT |
3639 | /* have disk failed, and we're requested to fetch it; |
3640 | * do compute it | |
a4456856 | 3641 | */ |
5599becc YT |
3642 | pr_debug("Computing stripe %llu block %d\n", |
3643 | (unsigned long long)sh->sector, disk_idx); | |
3644 | set_bit(STRIPE_COMPUTE_RUN, &sh->state); | |
3645 | set_bit(STRIPE_OP_COMPUTE_BLK, &s->ops_request); | |
3646 | set_bit(R5_Wantcompute, &dev->flags); | |
3647 | sh->ops.target = disk_idx; | |
3648 | sh->ops.target2 = -1; /* no 2nd target */ | |
3649 | s->req_compute = 1; | |
93b3dbce N |
3650 | /* Careful: from this point on 'uptodate' is in the eye |
3651 | * of raid_run_ops which services 'compute' operations | |
3652 | * before writes. R5_Wantcompute flags a block that will | |
3653 | * be R5_UPTODATE by the time it is needed for a | |
3654 | * subsequent operation. | |
3655 | */ | |
5599becc YT |
3656 | s->uptodate++; |
3657 | return 1; | |
3658 | } else if (s->uptodate == disks-2 && s->failed >= 2) { | |
3659 | /* Computing 2-failure is *very* expensive; only | |
3660 | * do it if failed >= 2 | |
3661 | */ | |
3662 | int other; | |
3663 | for (other = disks; other--; ) { | |
3664 | if (other == disk_idx) | |
3665 | continue; | |
3666 | if (!test_bit(R5_UPTODATE, | |
3667 | &sh->dev[other].flags)) | |
3668 | break; | |
a4456856 | 3669 | } |
5599becc YT |
3670 | BUG_ON(other < 0); |
3671 | pr_debug("Computing stripe %llu blocks %d,%d\n", | |
3672 | (unsigned long long)sh->sector, | |
3673 | disk_idx, other); | |
3674 | set_bit(STRIPE_COMPUTE_RUN, &sh->state); | |
3675 | set_bit(STRIPE_OP_COMPUTE_BLK, &s->ops_request); | |
3676 | set_bit(R5_Wantcompute, &sh->dev[disk_idx].flags); | |
3677 | set_bit(R5_Wantcompute, &sh->dev[other].flags); | |
3678 | sh->ops.target = disk_idx; | |
3679 | sh->ops.target2 = other; | |
3680 | s->uptodate += 2; | |
3681 | s->req_compute = 1; | |
3682 | return 1; | |
3683 | } else if (test_bit(R5_Insync, &dev->flags)) { | |
3684 | set_bit(R5_LOCKED, &dev->flags); | |
3685 | set_bit(R5_Wantread, &dev->flags); | |
3686 | s->locked++; | |
3687 | pr_debug("Reading block %d (sync=%d)\n", | |
3688 | disk_idx, s->syncing); | |
a4456856 DW |
3689 | } |
3690 | } | |
5599becc YT |
3691 | |
3692 | return 0; | |
3693 | } | |
3694 | ||
3695 | /** | |
93b3dbce | 3696 | * handle_stripe_fill - read or compute data to satisfy pending requests. |
5599becc | 3697 | */ |
93b3dbce N |
3698 | static void handle_stripe_fill(struct stripe_head *sh, |
3699 | struct stripe_head_state *s, | |
3700 | int disks) | |
5599becc YT |
3701 | { |
3702 | int i; | |
3703 | ||
3704 | /* look for blocks to read/compute, skip this if a compute | |
3705 | * is already in flight, or if the stripe contents are in the | |
3706 | * midst of changing due to a write | |
3707 | */ | |
3708 | if (!test_bit(STRIPE_COMPUTE_RUN, &sh->state) && !sh->check_state && | |
07e83364 SL |
3709 | !sh->reconstruct_state) { |
3710 | ||
3711 | /* | |
3712 | * For degraded stripe with data in journal, do not handle | |
3713 | * read requests yet, instead, flush the stripe to raid | |
3714 | * disks first, this avoids handling complex rmw of write | |
3715 | * back cache (prexor with orig_page, and then xor with | |
3716 | * page) in the read path | |
3717 | */ | |
3718 | if (s->injournal && s->failed) { | |
3719 | if (test_bit(STRIPE_R5C_CACHING, &sh->state)) | |
3720 | r5c_make_stripe_write_out(sh); | |
3721 | goto out; | |
3722 | } | |
3723 | ||
5599becc | 3724 | for (i = disks; i--; ) |
93b3dbce | 3725 | if (fetch_block(sh, s, i, disks)) |
5599becc | 3726 | break; |
07e83364 SL |
3727 | } |
3728 | out: | |
a4456856 DW |
3729 | set_bit(STRIPE_HANDLE, &sh->state); |
3730 | } | |
3731 | ||
787b76fa N |
3732 | static void break_stripe_batch_list(struct stripe_head *head_sh, |
3733 | unsigned long handle_flags); | |
1fe797e6 | 3734 | /* handle_stripe_clean_event |
a4456856 DW |
3735 | * any written block on an uptodate or failed drive can be returned. |
3736 | * Note that if we 'wrote' to a failed drive, it will be UPTODATE, but | |
3737 | * never LOCKED, so we don't need to test 'failed' directly. | |
3738 | */ | |
d1688a6d | 3739 | static void handle_stripe_clean_event(struct r5conf *conf, |
bd83d0a2 | 3740 | struct stripe_head *sh, int disks) |
a4456856 DW |
3741 | { |
3742 | int i; | |
3743 | struct r5dev *dev; | |
f8dfcffd | 3744 | int discard_pending = 0; |
59fc630b | 3745 | struct stripe_head *head_sh = sh; |
3746 | bool do_endio = false; | |
a4456856 DW |
3747 | |
3748 | for (i = disks; i--; ) | |
3749 | if (sh->dev[i].written) { | |
3750 | dev = &sh->dev[i]; | |
3751 | if (!test_bit(R5_LOCKED, &dev->flags) && | |
9e444768 | 3752 | (test_bit(R5_UPTODATE, &dev->flags) || |
d592a996 SL |
3753 | test_bit(R5_Discard, &dev->flags) || |
3754 | test_bit(R5_SkipCopy, &dev->flags))) { | |
a4456856 DW |
3755 | /* We can return any write requests */ |
3756 | struct bio *wbi, *wbi2; | |
45b4233c | 3757 | pr_debug("Return write for disc %d\n", i); |
ca64cae9 N |
3758 | if (test_and_clear_bit(R5_Discard, &dev->flags)) |
3759 | clear_bit(R5_UPTODATE, &dev->flags); | |
d592a996 SL |
3760 | if (test_and_clear_bit(R5_SkipCopy, &dev->flags)) { |
3761 | WARN_ON(test_bit(R5_UPTODATE, &dev->flags)); | |
d592a996 | 3762 | } |
59fc630b | 3763 | do_endio = true; |
3764 | ||
3765 | returnbi: | |
3766 | dev->page = dev->orig_page; | |
a4456856 DW |
3767 | wbi = dev->written; |
3768 | dev->written = NULL; | |
4f024f37 | 3769 | while (wbi && wbi->bi_iter.bi_sector < |
a4456856 DW |
3770 | dev->sector + STRIPE_SECTORS) { |
3771 | wbi2 = r5_next_bio(wbi, dev->sector); | |
49728050 | 3772 | md_write_end(conf->mddev); |
016c76ac | 3773 | bio_endio(wbi); |
a4456856 DW |
3774 | wbi = wbi2; |
3775 | } | |
7eaf7e8e SL |
3776 | bitmap_endwrite(conf->mddev->bitmap, sh->sector, |
3777 | STRIPE_SECTORS, | |
a4456856 | 3778 | !test_bit(STRIPE_DEGRADED, &sh->state), |
7eaf7e8e | 3779 | 0); |
59fc630b | 3780 | if (head_sh->batch_head) { |
3781 | sh = list_first_entry(&sh->batch_list, | |
3782 | struct stripe_head, | |
3783 | batch_list); | |
3784 | if (sh != head_sh) { | |
3785 | dev = &sh->dev[i]; | |
3786 | goto returnbi; | |
3787 | } | |
3788 | } | |
3789 | sh = head_sh; | |
3790 | dev = &sh->dev[i]; | |
f8dfcffd N |
3791 | } else if (test_bit(R5_Discard, &dev->flags)) |
3792 | discard_pending = 1; | |
3793 | } | |
f6bed0ef | 3794 | |
ff875738 | 3795 | log_stripe_write_finished(sh); |
0576b1c6 | 3796 | |
f8dfcffd N |
3797 | if (!discard_pending && |
3798 | test_bit(R5_Discard, &sh->dev[sh->pd_idx].flags)) { | |
b8a9d66d | 3799 | int hash; |
f8dfcffd N |
3800 | clear_bit(R5_Discard, &sh->dev[sh->pd_idx].flags); |
3801 | clear_bit(R5_UPTODATE, &sh->dev[sh->pd_idx].flags); | |
3802 | if (sh->qd_idx >= 0) { | |
3803 | clear_bit(R5_Discard, &sh->dev[sh->qd_idx].flags); | |
3804 | clear_bit(R5_UPTODATE, &sh->dev[sh->qd_idx].flags); | |
3805 | } | |
3806 | /* now that discard is done we can proceed with any sync */ | |
3807 | clear_bit(STRIPE_DISCARD, &sh->state); | |
d47648fc SL |
3808 | /* |
3809 | * SCSI discard will change some bio fields and the stripe has | |
3810 | * no updated data, so remove it from hash list and the stripe | |
3811 | * will be reinitialized | |
3812 | */ | |
59fc630b | 3813 | unhash: |
b8a9d66d RG |
3814 | hash = sh->hash_lock_index; |
3815 | spin_lock_irq(conf->hash_locks + hash); | |
d47648fc | 3816 | remove_hash(sh); |
b8a9d66d | 3817 | spin_unlock_irq(conf->hash_locks + hash); |
59fc630b | 3818 | if (head_sh->batch_head) { |
3819 | sh = list_first_entry(&sh->batch_list, | |
3820 | struct stripe_head, batch_list); | |
3821 | if (sh != head_sh) | |
3822 | goto unhash; | |
3823 | } | |
59fc630b | 3824 | sh = head_sh; |
3825 | ||
f8dfcffd N |
3826 | if (test_bit(STRIPE_SYNC_REQUESTED, &sh->state)) |
3827 | set_bit(STRIPE_HANDLE, &sh->state); | |
3828 | ||
3829 | } | |
8b3e6cdc DW |
3830 | |
3831 | if (test_and_clear_bit(STRIPE_FULL_WRITE, &sh->state)) | |
3832 | if (atomic_dec_and_test(&conf->pending_full_writes)) | |
3833 | md_wakeup_thread(conf->mddev->thread); | |
59fc630b | 3834 | |
787b76fa N |
3835 | if (head_sh->batch_head && do_endio) |
3836 | break_stripe_batch_list(head_sh, STRIPE_EXPAND_SYNC_FLAGS); | |
a4456856 DW |
3837 | } |
3838 | ||
86aa1397 SL |
3839 | /* |
3840 | * For RMW in write back cache, we need extra page in prexor to store the | |
3841 | * old data. This page is stored in dev->orig_page. | |
3842 | * | |
3843 | * This function checks whether we have data for prexor. The exact logic | |
3844 | * is: | |
3845 | * R5_UPTODATE && (!R5_InJournal || R5_OrigPageUPTDODATE) | |
3846 | */ | |
3847 | static inline bool uptodate_for_rmw(struct r5dev *dev) | |
3848 | { | |
3849 | return (test_bit(R5_UPTODATE, &dev->flags)) && | |
3850 | (!test_bit(R5_InJournal, &dev->flags) || | |
3851 | test_bit(R5_OrigPageUPTDODATE, &dev->flags)); | |
3852 | } | |
3853 | ||
d7bd398e SL |
3854 | static int handle_stripe_dirtying(struct r5conf *conf, |
3855 | struct stripe_head *sh, | |
3856 | struct stripe_head_state *s, | |
3857 | int disks) | |
a4456856 DW |
3858 | { |
3859 | int rmw = 0, rcw = 0, i; | |
a7854487 AL |
3860 | sector_t recovery_cp = conf->mddev->recovery_cp; |
3861 | ||
584acdd4 | 3862 | /* Check whether resync is now happening or should start. |
a7854487 AL |
3863 | * If yes, then the array is dirty (after unclean shutdown or |
3864 | * initial creation), so parity in some stripes might be inconsistent. | |
3865 | * In this case, we need to always do reconstruct-write, to ensure | |
3866 | * that in case of drive failure or read-error correction, we | |
3867 | * generate correct data from the parity. | |
3868 | */ | |
584acdd4 | 3869 | if (conf->rmw_level == PARITY_DISABLE_RMW || |
26ac1073 N |
3870 | (recovery_cp < MaxSector && sh->sector >= recovery_cp && |
3871 | s->failed == 0)) { | |
a7854487 | 3872 | /* Calculate the real rcw later - for now make it |
c8ac1803 N |
3873 | * look like rcw is cheaper |
3874 | */ | |
3875 | rcw = 1; rmw = 2; | |
584acdd4 MS |
3876 | pr_debug("force RCW rmw_level=%u, recovery_cp=%llu sh->sector=%llu\n", |
3877 | conf->rmw_level, (unsigned long long)recovery_cp, | |
a7854487 | 3878 | (unsigned long long)sh->sector); |
c8ac1803 | 3879 | } else for (i = disks; i--; ) { |
a4456856 DW |
3880 | /* would I have to read this buffer for read_modify_write */ |
3881 | struct r5dev *dev = &sh->dev[i]; | |
39b99586 | 3882 | if (((dev->towrite && !delay_towrite(conf, dev, s)) || |
07e83364 | 3883 | i == sh->pd_idx || i == sh->qd_idx || |
1e6d690b | 3884 | test_bit(R5_InJournal, &dev->flags)) && |
a4456856 | 3885 | !test_bit(R5_LOCKED, &dev->flags) && |
86aa1397 | 3886 | !(uptodate_for_rmw(dev) || |
f38e1219 | 3887 | test_bit(R5_Wantcompute, &dev->flags))) { |
a4456856 DW |
3888 | if (test_bit(R5_Insync, &dev->flags)) |
3889 | rmw++; | |
3890 | else | |
3891 | rmw += 2*disks; /* cannot read it */ | |
3892 | } | |
3893 | /* Would I have to read this buffer for reconstruct_write */ | |
584acdd4 MS |
3894 | if (!test_bit(R5_OVERWRITE, &dev->flags) && |
3895 | i != sh->pd_idx && i != sh->qd_idx && | |
a4456856 | 3896 | !test_bit(R5_LOCKED, &dev->flags) && |
f38e1219 | 3897 | !(test_bit(R5_UPTODATE, &dev->flags) || |
1e6d690b | 3898 | test_bit(R5_Wantcompute, &dev->flags))) { |
67f45548 N |
3899 | if (test_bit(R5_Insync, &dev->flags)) |
3900 | rcw++; | |
a4456856 DW |
3901 | else |
3902 | rcw += 2*disks; | |
3903 | } | |
3904 | } | |
1e6d690b | 3905 | |
39b99586 SL |
3906 | pr_debug("for sector %llu state 0x%lx, rmw=%d rcw=%d\n", |
3907 | (unsigned long long)sh->sector, sh->state, rmw, rcw); | |
a4456856 | 3908 | set_bit(STRIPE_HANDLE, &sh->state); |
41257580 | 3909 | if ((rmw < rcw || (rmw == rcw && conf->rmw_level == PARITY_PREFER_RMW)) && rmw > 0) { |
a4456856 | 3910 | /* prefer read-modify-write, but need to get some data */ |
e3620a3a JB |
3911 | if (conf->mddev->queue) |
3912 | blk_add_trace_msg(conf->mddev->queue, | |
3913 | "raid5 rmw %llu %d", | |
3914 | (unsigned long long)sh->sector, rmw); | |
a4456856 DW |
3915 | for (i = disks; i--; ) { |
3916 | struct r5dev *dev = &sh->dev[i]; | |
1e6d690b SL |
3917 | if (test_bit(R5_InJournal, &dev->flags) && |
3918 | dev->page == dev->orig_page && | |
3919 | !test_bit(R5_LOCKED, &sh->dev[sh->pd_idx].flags)) { | |
3920 | /* alloc page for prexor */ | |
d7bd398e SL |
3921 | struct page *p = alloc_page(GFP_NOIO); |
3922 | ||
3923 | if (p) { | |
3924 | dev->orig_page = p; | |
3925 | continue; | |
3926 | } | |
3927 | ||
3928 | /* | |
3929 | * alloc_page() failed, try use | |
3930 | * disk_info->extra_page | |
3931 | */ | |
3932 | if (!test_and_set_bit(R5C_EXTRA_PAGE_IN_USE, | |
3933 | &conf->cache_state)) { | |
3934 | r5c_use_extra_page(sh); | |
3935 | break; | |
3936 | } | |
1e6d690b | 3937 | |
d7bd398e SL |
3938 | /* extra_page in use, add to delayed_list */ |
3939 | set_bit(STRIPE_DELAYED, &sh->state); | |
3940 | s->waiting_extra_page = 1; | |
3941 | return -EAGAIN; | |
1e6d690b | 3942 | } |
d7bd398e | 3943 | } |
1e6d690b | 3944 | |
d7bd398e SL |
3945 | for (i = disks; i--; ) { |
3946 | struct r5dev *dev = &sh->dev[i]; | |
39b99586 | 3947 | if (((dev->towrite && !delay_towrite(conf, dev, s)) || |
1e6d690b SL |
3948 | i == sh->pd_idx || i == sh->qd_idx || |
3949 | test_bit(R5_InJournal, &dev->flags)) && | |
a4456856 | 3950 | !test_bit(R5_LOCKED, &dev->flags) && |
86aa1397 | 3951 | !(uptodate_for_rmw(dev) || |
1e6d690b | 3952 | test_bit(R5_Wantcompute, &dev->flags)) && |
a4456856 | 3953 | test_bit(R5_Insync, &dev->flags)) { |
67f45548 N |
3954 | if (test_bit(STRIPE_PREREAD_ACTIVE, |
3955 | &sh->state)) { | |
3956 | pr_debug("Read_old block %d for r-m-w\n", | |
3957 | i); | |
a4456856 DW |
3958 | set_bit(R5_LOCKED, &dev->flags); |
3959 | set_bit(R5_Wantread, &dev->flags); | |
3960 | s->locked++; | |
3961 | } else { | |
3962 | set_bit(STRIPE_DELAYED, &sh->state); | |
3963 | set_bit(STRIPE_HANDLE, &sh->state); | |
3964 | } | |
3965 | } | |
3966 | } | |
a9add5d9 | 3967 | } |
41257580 | 3968 | if ((rcw < rmw || (rcw == rmw && conf->rmw_level != PARITY_PREFER_RMW)) && rcw > 0) { |
a4456856 | 3969 | /* want reconstruct write, but need to get some data */ |
a9add5d9 | 3970 | int qread =0; |
c8ac1803 | 3971 | rcw = 0; |
a4456856 DW |
3972 | for (i = disks; i--; ) { |
3973 | struct r5dev *dev = &sh->dev[i]; | |
3974 | if (!test_bit(R5_OVERWRITE, &dev->flags) && | |
c8ac1803 | 3975 | i != sh->pd_idx && i != sh->qd_idx && |
a4456856 | 3976 | !test_bit(R5_LOCKED, &dev->flags) && |
f38e1219 | 3977 | !(test_bit(R5_UPTODATE, &dev->flags) || |
c8ac1803 N |
3978 | test_bit(R5_Wantcompute, &dev->flags))) { |
3979 | rcw++; | |
67f45548 N |
3980 | if (test_bit(R5_Insync, &dev->flags) && |
3981 | test_bit(STRIPE_PREREAD_ACTIVE, | |
3982 | &sh->state)) { | |
45b4233c | 3983 | pr_debug("Read_old block " |
a4456856 DW |
3984 | "%d for Reconstruct\n", i); |
3985 | set_bit(R5_LOCKED, &dev->flags); | |
3986 | set_bit(R5_Wantread, &dev->flags); | |
3987 | s->locked++; | |
a9add5d9 | 3988 | qread++; |
a4456856 DW |
3989 | } else { |
3990 | set_bit(STRIPE_DELAYED, &sh->state); | |
3991 | set_bit(STRIPE_HANDLE, &sh->state); | |
3992 | } | |
3993 | } | |
3994 | } | |
e3620a3a | 3995 | if (rcw && conf->mddev->queue) |
a9add5d9 N |
3996 | blk_add_trace_msg(conf->mddev->queue, "raid5 rcw %llu %d %d %d", |
3997 | (unsigned long long)sh->sector, | |
3998 | rcw, qread, test_bit(STRIPE_DELAYED, &sh->state)); | |
c8ac1803 | 3999 | } |
b1b02fe9 N |
4000 | |
4001 | if (rcw > disks && rmw > disks && | |
4002 | !test_bit(STRIPE_PREREAD_ACTIVE, &sh->state)) | |
4003 | set_bit(STRIPE_DELAYED, &sh->state); | |
4004 | ||
a4456856 DW |
4005 | /* now if nothing is locked, and if we have enough data, |
4006 | * we can start a write request | |
4007 | */ | |
f38e1219 DW |
4008 | /* since handle_stripe can be called at any time we need to handle the |
4009 | * case where a compute block operation has been submitted and then a | |
ac6b53b6 DW |
4010 | * subsequent call wants to start a write request. raid_run_ops only |
4011 | * handles the case where compute block and reconstruct are requested | |
f38e1219 DW |
4012 | * simultaneously. If this is not the case then new writes need to be |
4013 | * held off until the compute completes. | |
4014 | */ | |
976ea8d4 DW |
4015 | if ((s->req_compute || !test_bit(STRIPE_COMPUTE_RUN, &sh->state)) && |
4016 | (s->locked == 0 && (rcw == 0 || rmw == 0) && | |
1e6d690b | 4017 | !test_bit(STRIPE_BIT_DELAY, &sh->state))) |
c0f7bddb | 4018 | schedule_reconstruction(sh, s, rcw == 0, 0); |
d7bd398e | 4019 | return 0; |
a4456856 DW |
4020 | } |
4021 | ||
d1688a6d | 4022 | static void handle_parity_checks5(struct r5conf *conf, struct stripe_head *sh, |
a4456856 DW |
4023 | struct stripe_head_state *s, int disks) |
4024 | { | |
ecc65c9b | 4025 | struct r5dev *dev = NULL; |
bd2ab670 | 4026 | |
59fc630b | 4027 | BUG_ON(sh->batch_head); |
a4456856 | 4028 | set_bit(STRIPE_HANDLE, &sh->state); |
e89f8962 | 4029 | |
ecc65c9b DW |
4030 | switch (sh->check_state) { |
4031 | case check_state_idle: | |
4032 | /* start a new check operation if there are no failures */ | |
bd2ab670 | 4033 | if (s->failed == 0) { |
bd2ab670 | 4034 | BUG_ON(s->uptodate != disks); |
ecc65c9b DW |
4035 | sh->check_state = check_state_run; |
4036 | set_bit(STRIPE_OP_CHECK, &s->ops_request); | |
bd2ab670 | 4037 | clear_bit(R5_UPTODATE, &sh->dev[sh->pd_idx].flags); |
bd2ab670 | 4038 | s->uptodate--; |
ecc65c9b | 4039 | break; |
bd2ab670 | 4040 | } |
f2b3b44d | 4041 | dev = &sh->dev[s->failed_num[0]]; |
ecc65c9b DW |
4042 | /* fall through */ |
4043 | case check_state_compute_result: | |
4044 | sh->check_state = check_state_idle; | |
4045 | if (!dev) | |
4046 | dev = &sh->dev[sh->pd_idx]; | |
4047 | ||
4048 | /* check that a write has not made the stripe insync */ | |
4049 | if (test_bit(STRIPE_INSYNC, &sh->state)) | |
4050 | break; | |
c8894419 | 4051 | |
a4456856 | 4052 | /* either failed parity check, or recovery is happening */ |
a4456856 DW |
4053 | BUG_ON(!test_bit(R5_UPTODATE, &dev->flags)); |
4054 | BUG_ON(s->uptodate != disks); | |
4055 | ||
4056 | set_bit(R5_LOCKED, &dev->flags); | |
ecc65c9b | 4057 | s->locked++; |
a4456856 | 4058 | set_bit(R5_Wantwrite, &dev->flags); |
830ea016 | 4059 | |
a4456856 | 4060 | clear_bit(STRIPE_DEGRADED, &sh->state); |
a4456856 | 4061 | set_bit(STRIPE_INSYNC, &sh->state); |
ecc65c9b DW |
4062 | break; |
4063 | case check_state_run: | |
4064 | break; /* we will be called again upon completion */ | |
4065 | case check_state_check_result: | |
4066 | sh->check_state = check_state_idle; | |
4067 | ||
4068 | /* if a failure occurred during the check operation, leave | |
4069 | * STRIPE_INSYNC not set and let the stripe be handled again | |
4070 | */ | |
4071 | if (s->failed) | |
4072 | break; | |
4073 | ||
4074 | /* handle a successful check operation, if parity is correct | |
4075 | * we are done. Otherwise update the mismatch count and repair | |
4076 | * parity if !MD_RECOVERY_CHECK | |
4077 | */ | |
ad283ea4 | 4078 | if ((sh->ops.zero_sum_result & SUM_CHECK_P_RESULT) == 0) |
ecc65c9b DW |
4079 | /* parity is correct (on disc, |
4080 | * not in buffer any more) | |
4081 | */ | |
4082 | set_bit(STRIPE_INSYNC, &sh->state); | |
4083 | else { | |
7f7583d4 | 4084 | atomic64_add(STRIPE_SECTORS, &conf->mddev->resync_mismatches); |
e1539036 | 4085 | if (test_bit(MD_RECOVERY_CHECK, &conf->mddev->recovery)) { |
ecc65c9b DW |
4086 | /* don't try to repair!! */ |
4087 | set_bit(STRIPE_INSYNC, &sh->state); | |
e1539036 N |
4088 | pr_warn_ratelimited("%s: mismatch sector in range " |
4089 | "%llu-%llu\n", mdname(conf->mddev), | |
4090 | (unsigned long long) sh->sector, | |
4091 | (unsigned long long) sh->sector + | |
4092 | STRIPE_SECTORS); | |
4093 | } else { | |
ecc65c9b | 4094 | sh->check_state = check_state_compute_run; |
976ea8d4 | 4095 | set_bit(STRIPE_COMPUTE_RUN, &sh->state); |
ecc65c9b DW |
4096 | set_bit(STRIPE_OP_COMPUTE_BLK, &s->ops_request); |
4097 | set_bit(R5_Wantcompute, | |
4098 | &sh->dev[sh->pd_idx].flags); | |
4099 | sh->ops.target = sh->pd_idx; | |
ac6b53b6 | 4100 | sh->ops.target2 = -1; |
ecc65c9b DW |
4101 | s->uptodate++; |
4102 | } | |
4103 | } | |
4104 | break; | |
4105 | case check_state_compute_run: | |
4106 | break; | |
4107 | default: | |
cc6167b4 | 4108 | pr_err("%s: unknown check_state: %d sector: %llu\n", |
ecc65c9b DW |
4109 | __func__, sh->check_state, |
4110 | (unsigned long long) sh->sector); | |
4111 | BUG(); | |
a4456856 DW |
4112 | } |
4113 | } | |
4114 | ||
d1688a6d | 4115 | static void handle_parity_checks6(struct r5conf *conf, struct stripe_head *sh, |
36d1c647 | 4116 | struct stripe_head_state *s, |
f2b3b44d | 4117 | int disks) |
a4456856 | 4118 | { |
a4456856 | 4119 | int pd_idx = sh->pd_idx; |
34e04e87 | 4120 | int qd_idx = sh->qd_idx; |
d82dfee0 | 4121 | struct r5dev *dev; |
a4456856 | 4122 | |
59fc630b | 4123 | BUG_ON(sh->batch_head); |
a4456856 DW |
4124 | set_bit(STRIPE_HANDLE, &sh->state); |
4125 | ||
4126 | BUG_ON(s->failed > 2); | |
d82dfee0 | 4127 | |
a4456856 DW |
4128 | /* Want to check and possibly repair P and Q. |
4129 | * However there could be one 'failed' device, in which | |
4130 | * case we can only check one of them, possibly using the | |
4131 | * other to generate missing data | |
4132 | */ | |
4133 | ||
d82dfee0 DW |
4134 | switch (sh->check_state) { |
4135 | case check_state_idle: | |
4136 | /* start a new check operation if there are < 2 failures */ | |
f2b3b44d | 4137 | if (s->failed == s->q_failed) { |
d82dfee0 | 4138 | /* The only possible failed device holds Q, so it |
a4456856 DW |
4139 | * makes sense to check P (If anything else were failed, |
4140 | * we would have used P to recreate it). | |
4141 | */ | |
d82dfee0 | 4142 | sh->check_state = check_state_run; |
a4456856 | 4143 | } |
f2b3b44d | 4144 | if (!s->q_failed && s->failed < 2) { |
d82dfee0 | 4145 | /* Q is not failed, and we didn't use it to generate |
a4456856 DW |
4146 | * anything, so it makes sense to check it |
4147 | */ | |
d82dfee0 DW |
4148 | if (sh->check_state == check_state_run) |
4149 | sh->check_state = check_state_run_pq; | |
4150 | else | |
4151 | sh->check_state = check_state_run_q; | |
a4456856 | 4152 | } |
a4456856 | 4153 | |
d82dfee0 DW |
4154 | /* discard potentially stale zero_sum_result */ |
4155 | sh->ops.zero_sum_result = 0; | |
a4456856 | 4156 | |
d82dfee0 DW |
4157 | if (sh->check_state == check_state_run) { |
4158 | /* async_xor_zero_sum destroys the contents of P */ | |
4159 | clear_bit(R5_UPTODATE, &sh->dev[pd_idx].flags); | |
4160 | s->uptodate--; | |
a4456856 | 4161 | } |
d82dfee0 DW |
4162 | if (sh->check_state >= check_state_run && |
4163 | sh->check_state <= check_state_run_pq) { | |
4164 | /* async_syndrome_zero_sum preserves P and Q, so | |
4165 | * no need to mark them !uptodate here | |
4166 | */ | |
4167 | set_bit(STRIPE_OP_CHECK, &s->ops_request); | |
4168 | break; | |
a4456856 DW |
4169 | } |
4170 | ||
d82dfee0 DW |
4171 | /* we have 2-disk failure */ |
4172 | BUG_ON(s->failed != 2); | |
4173 | /* fall through */ | |
4174 | case check_state_compute_result: | |
4175 | sh->check_state = check_state_idle; | |
a4456856 | 4176 | |
d82dfee0 DW |
4177 | /* check that a write has not made the stripe insync */ |
4178 | if (test_bit(STRIPE_INSYNC, &sh->state)) | |
4179 | break; | |
a4456856 DW |
4180 | |
4181 | /* now write out any block on a failed drive, | |
d82dfee0 | 4182 | * or P or Q if they were recomputed |
a4456856 | 4183 | */ |
d82dfee0 | 4184 | BUG_ON(s->uptodate < disks - 1); /* We don't need Q to recover */ |
a4456856 | 4185 | if (s->failed == 2) { |
f2b3b44d | 4186 | dev = &sh->dev[s->failed_num[1]]; |
a4456856 DW |
4187 | s->locked++; |
4188 | set_bit(R5_LOCKED, &dev->flags); | |
4189 | set_bit(R5_Wantwrite, &dev->flags); | |
4190 | } | |
4191 | if (s->failed >= 1) { | |
f2b3b44d | 4192 | dev = &sh->dev[s->failed_num[0]]; |
a4456856 DW |
4193 | s->locked++; |
4194 | set_bit(R5_LOCKED, &dev->flags); | |
4195 | set_bit(R5_Wantwrite, &dev->flags); | |
4196 | } | |
d82dfee0 | 4197 | if (sh->ops.zero_sum_result & SUM_CHECK_P_RESULT) { |
a4456856 DW |
4198 | dev = &sh->dev[pd_idx]; |
4199 | s->locked++; | |
4200 | set_bit(R5_LOCKED, &dev->flags); | |
4201 | set_bit(R5_Wantwrite, &dev->flags); | |
4202 | } | |
d82dfee0 | 4203 | if (sh->ops.zero_sum_result & SUM_CHECK_Q_RESULT) { |
a4456856 DW |
4204 | dev = &sh->dev[qd_idx]; |
4205 | s->locked++; | |
4206 | set_bit(R5_LOCKED, &dev->flags); | |
4207 | set_bit(R5_Wantwrite, &dev->flags); | |
4208 | } | |
4209 | clear_bit(STRIPE_DEGRADED, &sh->state); | |
4210 | ||
4211 | set_bit(STRIPE_INSYNC, &sh->state); | |
d82dfee0 DW |
4212 | break; |
4213 | case check_state_run: | |
4214 | case check_state_run_q: | |
4215 | case check_state_run_pq: | |
4216 | break; /* we will be called again upon completion */ | |
4217 | case check_state_check_result: | |
4218 | sh->check_state = check_state_idle; | |
4219 | ||
4220 | /* handle a successful check operation, if parity is correct | |
4221 | * we are done. Otherwise update the mismatch count and repair | |
4222 | * parity if !MD_RECOVERY_CHECK | |
4223 | */ | |
4224 | if (sh->ops.zero_sum_result == 0) { | |
4225 | /* both parities are correct */ | |
4226 | if (!s->failed) | |
4227 | set_bit(STRIPE_INSYNC, &sh->state); | |
4228 | else { | |
4229 | /* in contrast to the raid5 case we can validate | |
4230 | * parity, but still have a failure to write | |
4231 | * back | |
4232 | */ | |
4233 | sh->check_state = check_state_compute_result; | |
4234 | /* Returning at this point means that we may go | |
4235 | * off and bring p and/or q uptodate again so | |
4236 | * we make sure to check zero_sum_result again | |
4237 | * to verify if p or q need writeback | |
4238 | */ | |
4239 | } | |
4240 | } else { | |
7f7583d4 | 4241 | atomic64_add(STRIPE_SECTORS, &conf->mddev->resync_mismatches); |
e1539036 | 4242 | if (test_bit(MD_RECOVERY_CHECK, &conf->mddev->recovery)) { |
d82dfee0 DW |
4243 | /* don't try to repair!! */ |
4244 | set_bit(STRIPE_INSYNC, &sh->state); | |
e1539036 N |
4245 | pr_warn_ratelimited("%s: mismatch sector in range " |
4246 | "%llu-%llu\n", mdname(conf->mddev), | |
4247 | (unsigned long long) sh->sector, | |
4248 | (unsigned long long) sh->sector + | |
4249 | STRIPE_SECTORS); | |
4250 | } else { | |
d82dfee0 DW |
4251 | int *target = &sh->ops.target; |
4252 | ||
4253 | sh->ops.target = -1; | |
4254 | sh->ops.target2 = -1; | |
4255 | sh->check_state = check_state_compute_run; | |
4256 | set_bit(STRIPE_COMPUTE_RUN, &sh->state); | |
4257 | set_bit(STRIPE_OP_COMPUTE_BLK, &s->ops_request); | |
4258 | if (sh->ops.zero_sum_result & SUM_CHECK_P_RESULT) { | |
4259 | set_bit(R5_Wantcompute, | |
4260 | &sh->dev[pd_idx].flags); | |
4261 | *target = pd_idx; | |
4262 | target = &sh->ops.target2; | |
4263 | s->uptodate++; | |
4264 | } | |
4265 | if (sh->ops.zero_sum_result & SUM_CHECK_Q_RESULT) { | |
4266 | set_bit(R5_Wantcompute, | |
4267 | &sh->dev[qd_idx].flags); | |
4268 | *target = qd_idx; | |
4269 | s->uptodate++; | |
4270 | } | |
4271 | } | |
4272 | } | |
4273 | break; | |
4274 | case check_state_compute_run: | |
4275 | break; | |
4276 | default: | |
cc6167b4 N |
4277 | pr_warn("%s: unknown check_state: %d sector: %llu\n", |
4278 | __func__, sh->check_state, | |
4279 | (unsigned long long) sh->sector); | |
d82dfee0 | 4280 | BUG(); |
a4456856 DW |
4281 | } |
4282 | } | |
4283 | ||
d1688a6d | 4284 | static void handle_stripe_expansion(struct r5conf *conf, struct stripe_head *sh) |
a4456856 DW |
4285 | { |
4286 | int i; | |
4287 | ||
4288 | /* We have read all the blocks in this stripe and now we need to | |
4289 | * copy some of them into a target stripe for expand. | |
4290 | */ | |
f0a50d37 | 4291 | struct dma_async_tx_descriptor *tx = NULL; |
59fc630b | 4292 | BUG_ON(sh->batch_head); |
a4456856 DW |
4293 | clear_bit(STRIPE_EXPAND_SOURCE, &sh->state); |
4294 | for (i = 0; i < sh->disks; i++) | |
34e04e87 | 4295 | if (i != sh->pd_idx && i != sh->qd_idx) { |
911d4ee8 | 4296 | int dd_idx, j; |
a4456856 | 4297 | struct stripe_head *sh2; |
a08abd8c | 4298 | struct async_submit_ctl submit; |
a4456856 | 4299 | |
6d036f7d | 4300 | sector_t bn = raid5_compute_blocknr(sh, i, 1); |
911d4ee8 N |
4301 | sector_t s = raid5_compute_sector(conf, bn, 0, |
4302 | &dd_idx, NULL); | |
6d036f7d | 4303 | sh2 = raid5_get_active_stripe(conf, s, 0, 1, 1); |
a4456856 DW |
4304 | if (sh2 == NULL) |
4305 | /* so far only the early blocks of this stripe | |
4306 | * have been requested. When later blocks | |
4307 | * get requested, we will try again | |
4308 | */ | |
4309 | continue; | |
4310 | if (!test_bit(STRIPE_EXPANDING, &sh2->state) || | |
4311 | test_bit(R5_Expanded, &sh2->dev[dd_idx].flags)) { | |
4312 | /* must have already done this block */ | |
6d036f7d | 4313 | raid5_release_stripe(sh2); |
a4456856 DW |
4314 | continue; |
4315 | } | |
f0a50d37 DW |
4316 | |
4317 | /* place all the copies on one channel */ | |
a08abd8c | 4318 | init_async_submit(&submit, 0, tx, NULL, NULL, NULL); |
f0a50d37 | 4319 | tx = async_memcpy(sh2->dev[dd_idx].page, |
88ba2aa5 | 4320 | sh->dev[i].page, 0, 0, STRIPE_SIZE, |
a08abd8c | 4321 | &submit); |
f0a50d37 | 4322 | |
a4456856 DW |
4323 | set_bit(R5_Expanded, &sh2->dev[dd_idx].flags); |
4324 | set_bit(R5_UPTODATE, &sh2->dev[dd_idx].flags); | |
4325 | for (j = 0; j < conf->raid_disks; j++) | |
4326 | if (j != sh2->pd_idx && | |
86c374ba | 4327 | j != sh2->qd_idx && |
a4456856 DW |
4328 | !test_bit(R5_Expanded, &sh2->dev[j].flags)) |
4329 | break; | |
4330 | if (j == conf->raid_disks) { | |
4331 | set_bit(STRIPE_EXPAND_READY, &sh2->state); | |
4332 | set_bit(STRIPE_HANDLE, &sh2->state); | |
4333 | } | |
6d036f7d | 4334 | raid5_release_stripe(sh2); |
f0a50d37 | 4335 | |
a4456856 | 4336 | } |
a2e08551 | 4337 | /* done submitting copies, wait for them to complete */ |
749586b7 | 4338 | async_tx_quiesce(&tx); |
a4456856 | 4339 | } |
1da177e4 LT |
4340 | |
4341 | /* | |
4342 | * handle_stripe - do things to a stripe. | |
4343 | * | |
9a3e1101 N |
4344 | * We lock the stripe by setting STRIPE_ACTIVE and then examine the |
4345 | * state of various bits to see what needs to be done. | |
1da177e4 | 4346 | * Possible results: |
9a3e1101 N |
4347 | * return some read requests which now have data |
4348 | * return some write requests which are safely on storage | |
1da177e4 LT |
4349 | * schedule a read on some buffers |
4350 | * schedule a write of some buffers | |
4351 | * return confirmation of parity correctness | |
4352 | * | |
1da177e4 | 4353 | */ |
a4456856 | 4354 | |
acfe726b | 4355 | static void analyse_stripe(struct stripe_head *sh, struct stripe_head_state *s) |
1da177e4 | 4356 | { |
d1688a6d | 4357 | struct r5conf *conf = sh->raid_conf; |
f416885e | 4358 | int disks = sh->disks; |
474af965 N |
4359 | struct r5dev *dev; |
4360 | int i; | |
9a3e1101 | 4361 | int do_recovery = 0; |
1da177e4 | 4362 | |
acfe726b N |
4363 | memset(s, 0, sizeof(*s)); |
4364 | ||
dabc4ec6 | 4365 | s->expanding = test_bit(STRIPE_EXPAND_SOURCE, &sh->state) && !sh->batch_head; |
4366 | s->expanded = test_bit(STRIPE_EXPAND_READY, &sh->state) && !sh->batch_head; | |
acfe726b N |
4367 | s->failed_num[0] = -1; |
4368 | s->failed_num[1] = -1; | |
6e74a9cf | 4369 | s->log_failed = r5l_log_disk_error(conf); |
1da177e4 | 4370 | |
acfe726b | 4371 | /* Now to look around and see what can be done */ |
1da177e4 | 4372 | rcu_read_lock(); |
16a53ecc | 4373 | for (i=disks; i--; ) { |
3cb03002 | 4374 | struct md_rdev *rdev; |
31c176ec N |
4375 | sector_t first_bad; |
4376 | int bad_sectors; | |
4377 | int is_bad = 0; | |
acfe726b | 4378 | |
16a53ecc | 4379 | dev = &sh->dev[i]; |
1da177e4 | 4380 | |
45b4233c | 4381 | pr_debug("check %d: state 0x%lx read %p write %p written %p\n", |
9a3e1101 N |
4382 | i, dev->flags, |
4383 | dev->toread, dev->towrite, dev->written); | |
6c0069c0 YT |
4384 | /* maybe we can reply to a read |
4385 | * | |
4386 | * new wantfill requests are only permitted while | |
4387 | * ops_complete_biofill is guaranteed to be inactive | |
4388 | */ | |
4389 | if (test_bit(R5_UPTODATE, &dev->flags) && dev->toread && | |
4390 | !test_bit(STRIPE_BIOFILL_RUN, &sh->state)) | |
4391 | set_bit(R5_Wantfill, &dev->flags); | |
1da177e4 | 4392 | |
16a53ecc | 4393 | /* now count some things */ |
cc94015a N |
4394 | if (test_bit(R5_LOCKED, &dev->flags)) |
4395 | s->locked++; | |
4396 | if (test_bit(R5_UPTODATE, &dev->flags)) | |
4397 | s->uptodate++; | |
2d6e4ecc | 4398 | if (test_bit(R5_Wantcompute, &dev->flags)) { |
cc94015a N |
4399 | s->compute++; |
4400 | BUG_ON(s->compute > 2); | |
2d6e4ecc | 4401 | } |
1da177e4 | 4402 | |
acfe726b | 4403 | if (test_bit(R5_Wantfill, &dev->flags)) |
cc94015a | 4404 | s->to_fill++; |
acfe726b | 4405 | else if (dev->toread) |
cc94015a | 4406 | s->to_read++; |
16a53ecc | 4407 | if (dev->towrite) { |
cc94015a | 4408 | s->to_write++; |
16a53ecc | 4409 | if (!test_bit(R5_OVERWRITE, &dev->flags)) |
cc94015a | 4410 | s->non_overwrite++; |
16a53ecc | 4411 | } |
a4456856 | 4412 | if (dev->written) |
cc94015a | 4413 | s->written++; |
14a75d3e N |
4414 | /* Prefer to use the replacement for reads, but only |
4415 | * if it is recovered enough and has no bad blocks. | |
4416 | */ | |
4417 | rdev = rcu_dereference(conf->disks[i].replacement); | |
4418 | if (rdev && !test_bit(Faulty, &rdev->flags) && | |
4419 | rdev->recovery_offset >= sh->sector + STRIPE_SECTORS && | |
4420 | !is_badblock(rdev, sh->sector, STRIPE_SECTORS, | |
4421 | &first_bad, &bad_sectors)) | |
4422 | set_bit(R5_ReadRepl, &dev->flags); | |
4423 | else { | |
e6030cb0 | 4424 | if (rdev && !test_bit(Faulty, &rdev->flags)) |
9a3e1101 | 4425 | set_bit(R5_NeedReplace, &dev->flags); |
e6030cb0 N |
4426 | else |
4427 | clear_bit(R5_NeedReplace, &dev->flags); | |
14a75d3e N |
4428 | rdev = rcu_dereference(conf->disks[i].rdev); |
4429 | clear_bit(R5_ReadRepl, &dev->flags); | |
4430 | } | |
9283d8c5 N |
4431 | if (rdev && test_bit(Faulty, &rdev->flags)) |
4432 | rdev = NULL; | |
31c176ec N |
4433 | if (rdev) { |
4434 | is_bad = is_badblock(rdev, sh->sector, STRIPE_SECTORS, | |
4435 | &first_bad, &bad_sectors); | |
4436 | if (s->blocked_rdev == NULL | |
4437 | && (test_bit(Blocked, &rdev->flags) | |
4438 | || is_bad < 0)) { | |
4439 | if (is_bad < 0) | |
4440 | set_bit(BlockedBadBlocks, | |
4441 | &rdev->flags); | |
4442 | s->blocked_rdev = rdev; | |
4443 | atomic_inc(&rdev->nr_pending); | |
4444 | } | |
6bfe0b49 | 4445 | } |
415e72d0 N |
4446 | clear_bit(R5_Insync, &dev->flags); |
4447 | if (!rdev) | |
4448 | /* Not in-sync */; | |
31c176ec N |
4449 | else if (is_bad) { |
4450 | /* also not in-sync */ | |
18b9837e N |
4451 | if (!test_bit(WriteErrorSeen, &rdev->flags) && |
4452 | test_bit(R5_UPTODATE, &dev->flags)) { | |
31c176ec N |
4453 | /* treat as in-sync, but with a read error |
4454 | * which we can now try to correct | |
4455 | */ | |
4456 | set_bit(R5_Insync, &dev->flags); | |
4457 | set_bit(R5_ReadError, &dev->flags); | |
4458 | } | |
4459 | } else if (test_bit(In_sync, &rdev->flags)) | |
415e72d0 | 4460 | set_bit(R5_Insync, &dev->flags); |
30d7a483 | 4461 | else if (sh->sector + STRIPE_SECTORS <= rdev->recovery_offset) |
415e72d0 | 4462 | /* in sync if before recovery_offset */ |
30d7a483 N |
4463 | set_bit(R5_Insync, &dev->flags); |
4464 | else if (test_bit(R5_UPTODATE, &dev->flags) && | |
4465 | test_bit(R5_Expanded, &dev->flags)) | |
4466 | /* If we've reshaped into here, we assume it is Insync. | |
4467 | * We will shortly update recovery_offset to make | |
4468 | * it official. | |
4469 | */ | |
4470 | set_bit(R5_Insync, &dev->flags); | |
4471 | ||
1cc03eb9 | 4472 | if (test_bit(R5_WriteError, &dev->flags)) { |
14a75d3e N |
4473 | /* This flag does not apply to '.replacement' |
4474 | * only to .rdev, so make sure to check that*/ | |
4475 | struct md_rdev *rdev2 = rcu_dereference( | |
4476 | conf->disks[i].rdev); | |
4477 | if (rdev2 == rdev) | |
4478 | clear_bit(R5_Insync, &dev->flags); | |
4479 | if (rdev2 && !test_bit(Faulty, &rdev2->flags)) { | |
bc2607f3 | 4480 | s->handle_bad_blocks = 1; |
14a75d3e | 4481 | atomic_inc(&rdev2->nr_pending); |
bc2607f3 N |
4482 | } else |
4483 | clear_bit(R5_WriteError, &dev->flags); | |
4484 | } | |
1cc03eb9 | 4485 | if (test_bit(R5_MadeGood, &dev->flags)) { |
14a75d3e N |
4486 | /* This flag does not apply to '.replacement' |
4487 | * only to .rdev, so make sure to check that*/ | |
4488 | struct md_rdev *rdev2 = rcu_dereference( | |
4489 | conf->disks[i].rdev); | |
4490 | if (rdev2 && !test_bit(Faulty, &rdev2->flags)) { | |
b84db560 | 4491 | s->handle_bad_blocks = 1; |
14a75d3e | 4492 | atomic_inc(&rdev2->nr_pending); |
b84db560 N |
4493 | } else |
4494 | clear_bit(R5_MadeGood, &dev->flags); | |
4495 | } | |
977df362 N |
4496 | if (test_bit(R5_MadeGoodRepl, &dev->flags)) { |
4497 | struct md_rdev *rdev2 = rcu_dereference( | |
4498 | conf->disks[i].replacement); | |
4499 | if (rdev2 && !test_bit(Faulty, &rdev2->flags)) { | |
4500 | s->handle_bad_blocks = 1; | |
4501 | atomic_inc(&rdev2->nr_pending); | |
4502 | } else | |
4503 | clear_bit(R5_MadeGoodRepl, &dev->flags); | |
4504 | } | |
415e72d0 | 4505 | if (!test_bit(R5_Insync, &dev->flags)) { |
16a53ecc N |
4506 | /* The ReadError flag will just be confusing now */ |
4507 | clear_bit(R5_ReadError, &dev->flags); | |
4508 | clear_bit(R5_ReWrite, &dev->flags); | |
1da177e4 | 4509 | } |
415e72d0 N |
4510 | if (test_bit(R5_ReadError, &dev->flags)) |
4511 | clear_bit(R5_Insync, &dev->flags); | |
4512 | if (!test_bit(R5_Insync, &dev->flags)) { | |
cc94015a N |
4513 | if (s->failed < 2) |
4514 | s->failed_num[s->failed] = i; | |
4515 | s->failed++; | |
9a3e1101 N |
4516 | if (rdev && !test_bit(Faulty, &rdev->flags)) |
4517 | do_recovery = 1; | |
415e72d0 | 4518 | } |
2ded3703 SL |
4519 | |
4520 | if (test_bit(R5_InJournal, &dev->flags)) | |
4521 | s->injournal++; | |
1e6d690b SL |
4522 | if (test_bit(R5_InJournal, &dev->flags) && dev->written) |
4523 | s->just_cached++; | |
1da177e4 | 4524 | } |
9a3e1101 N |
4525 | if (test_bit(STRIPE_SYNCING, &sh->state)) { |
4526 | /* If there is a failed device being replaced, | |
4527 | * we must be recovering. | |
4528 | * else if we are after recovery_cp, we must be syncing | |
c6d2e084 | 4529 | * else if MD_RECOVERY_REQUESTED is set, we also are syncing. |
9a3e1101 N |
4530 | * else we can only be replacing |
4531 | * sync and recovery both need to read all devices, and so | |
4532 | * use the same flag. | |
4533 | */ | |
4534 | if (do_recovery || | |
c6d2e084 | 4535 | sh->sector >= conf->mddev->recovery_cp || |
4536 | test_bit(MD_RECOVERY_REQUESTED, &(conf->mddev->recovery))) | |
9a3e1101 N |
4537 | s->syncing = 1; |
4538 | else | |
4539 | s->replacing = 1; | |
4540 | } | |
1da177e4 | 4541 | rcu_read_unlock(); |
cc94015a N |
4542 | } |
4543 | ||
59fc630b | 4544 | static int clear_batch_ready(struct stripe_head *sh) |
4545 | { | |
b15a9dbd N |
4546 | /* Return '1' if this is a member of batch, or |
4547 | * '0' if it is a lone stripe or a head which can now be | |
4548 | * handled. | |
4549 | */ | |
59fc630b | 4550 | struct stripe_head *tmp; |
4551 | if (!test_and_clear_bit(STRIPE_BATCH_READY, &sh->state)) | |
b15a9dbd | 4552 | return (sh->batch_head && sh->batch_head != sh); |
59fc630b | 4553 | spin_lock(&sh->stripe_lock); |
4554 | if (!sh->batch_head) { | |
4555 | spin_unlock(&sh->stripe_lock); | |
4556 | return 0; | |
4557 | } | |
4558 | ||
4559 | /* | |
4560 | * this stripe could be added to a batch list before we check | |
4561 | * BATCH_READY, skips it | |
4562 | */ | |
4563 | if (sh->batch_head != sh) { | |
4564 | spin_unlock(&sh->stripe_lock); | |
4565 | return 1; | |
4566 | } | |
4567 | spin_lock(&sh->batch_lock); | |
4568 | list_for_each_entry(tmp, &sh->batch_list, batch_list) | |
4569 | clear_bit(STRIPE_BATCH_READY, &tmp->state); | |
4570 | spin_unlock(&sh->batch_lock); | |
4571 | spin_unlock(&sh->stripe_lock); | |
4572 | ||
4573 | /* | |
4574 | * BATCH_READY is cleared, no new stripes can be added. | |
4575 | * batch_list can be accessed without lock | |
4576 | */ | |
4577 | return 0; | |
4578 | } | |
4579 | ||
3960ce79 N |
4580 | static void break_stripe_batch_list(struct stripe_head *head_sh, |
4581 | unsigned long handle_flags) | |
72ac7330 | 4582 | { |
4e3d62ff | 4583 | struct stripe_head *sh, *next; |
72ac7330 | 4584 | int i; |
fb642b92 | 4585 | int do_wakeup = 0; |
72ac7330 | 4586 | |
bb27051f N |
4587 | list_for_each_entry_safe(sh, next, &head_sh->batch_list, batch_list) { |
4588 | ||
72ac7330 | 4589 | list_del_init(&sh->batch_list); |
4590 | ||
fb3229d5 | 4591 | WARN_ONCE(sh->state & ((1 << STRIPE_ACTIVE) | |
1b956f7a N |
4592 | (1 << STRIPE_SYNCING) | |
4593 | (1 << STRIPE_REPLACED) | | |
1b956f7a N |
4594 | (1 << STRIPE_DELAYED) | |
4595 | (1 << STRIPE_BIT_DELAY) | | |
4596 | (1 << STRIPE_FULL_WRITE) | | |
4597 | (1 << STRIPE_BIOFILL_RUN) | | |
4598 | (1 << STRIPE_COMPUTE_RUN) | | |
4599 | (1 << STRIPE_OPS_REQ_PENDING) | | |
4600 | (1 << STRIPE_DISCARD) | | |
4601 | (1 << STRIPE_BATCH_READY) | | |
4602 | (1 << STRIPE_BATCH_ERR) | | |
fb3229d5 SL |
4603 | (1 << STRIPE_BITMAP_PENDING)), |
4604 | "stripe state: %lx\n", sh->state); | |
4605 | WARN_ONCE(head_sh->state & ((1 << STRIPE_DISCARD) | | |
4606 | (1 << STRIPE_REPLACED)), | |
4607 | "head stripe state: %lx\n", head_sh->state); | |
1b956f7a N |
4608 | |
4609 | set_mask_bits(&sh->state, ~(STRIPE_EXPAND_SYNC_FLAGS | | |
550da24f | 4610 | (1 << STRIPE_PREREAD_ACTIVE) | |
184a09eb DY |
4611 | (1 << STRIPE_DEGRADED) | |
4612 | (1 << STRIPE_ON_UNPLUG_LIST)), | |
1b956f7a N |
4613 | head_sh->state & (1 << STRIPE_INSYNC)); |
4614 | ||
72ac7330 | 4615 | sh->check_state = head_sh->check_state; |
4616 | sh->reconstruct_state = head_sh->reconstruct_state; | |
fb642b92 N |
4617 | for (i = 0; i < sh->disks; i++) { |
4618 | if (test_and_clear_bit(R5_Overlap, &sh->dev[i].flags)) | |
4619 | do_wakeup = 1; | |
72ac7330 | 4620 | sh->dev[i].flags = head_sh->dev[i].flags & |
4621 | (~((1 << R5_WriteError) | (1 << R5_Overlap))); | |
fb642b92 | 4622 | } |
72ac7330 | 4623 | spin_lock_irq(&sh->stripe_lock); |
4624 | sh->batch_head = NULL; | |
4625 | spin_unlock_irq(&sh->stripe_lock); | |
3960ce79 N |
4626 | if (handle_flags == 0 || |
4627 | sh->state & handle_flags) | |
4628 | set_bit(STRIPE_HANDLE, &sh->state); | |
6d036f7d | 4629 | raid5_release_stripe(sh); |
72ac7330 | 4630 | } |
fb642b92 N |
4631 | spin_lock_irq(&head_sh->stripe_lock); |
4632 | head_sh->batch_head = NULL; | |
4633 | spin_unlock_irq(&head_sh->stripe_lock); | |
4634 | for (i = 0; i < head_sh->disks; i++) | |
4635 | if (test_and_clear_bit(R5_Overlap, &head_sh->dev[i].flags)) | |
4636 | do_wakeup = 1; | |
3960ce79 N |
4637 | if (head_sh->state & handle_flags) |
4638 | set_bit(STRIPE_HANDLE, &head_sh->state); | |
fb642b92 N |
4639 | |
4640 | if (do_wakeup) | |
4641 | wake_up(&head_sh->raid_conf->wait_for_overlap); | |
72ac7330 | 4642 | } |
4643 | ||
cc94015a N |
4644 | static void handle_stripe(struct stripe_head *sh) |
4645 | { | |
4646 | struct stripe_head_state s; | |
d1688a6d | 4647 | struct r5conf *conf = sh->raid_conf; |
3687c061 | 4648 | int i; |
84789554 N |
4649 | int prexor; |
4650 | int disks = sh->disks; | |
474af965 | 4651 | struct r5dev *pdev, *qdev; |
cc94015a N |
4652 | |
4653 | clear_bit(STRIPE_HANDLE, &sh->state); | |
257a4b42 | 4654 | if (test_and_set_bit_lock(STRIPE_ACTIVE, &sh->state)) { |
cc94015a N |
4655 | /* already being handled, ensure it gets handled |
4656 | * again when current action finishes */ | |
4657 | set_bit(STRIPE_HANDLE, &sh->state); | |
4658 | return; | |
4659 | } | |
4660 | ||
59fc630b | 4661 | if (clear_batch_ready(sh) ) { |
4662 | clear_bit_unlock(STRIPE_ACTIVE, &sh->state); | |
4663 | return; | |
4664 | } | |
4665 | ||
4e3d62ff | 4666 | if (test_and_clear_bit(STRIPE_BATCH_ERR, &sh->state)) |
3960ce79 | 4667 | break_stripe_batch_list(sh, 0); |
72ac7330 | 4668 | |
dabc4ec6 | 4669 | if (test_bit(STRIPE_SYNC_REQUESTED, &sh->state) && !sh->batch_head) { |
f8dfcffd | 4670 | spin_lock(&sh->stripe_lock); |
5ddf0440 SL |
4671 | /* |
4672 | * Cannot process 'sync' concurrently with 'discard'. | |
4673 | * Flush data in r5cache before 'sync'. | |
4674 | */ | |
4675 | if (!test_bit(STRIPE_R5C_PARTIAL_STRIPE, &sh->state) && | |
4676 | !test_bit(STRIPE_R5C_FULL_STRIPE, &sh->state) && | |
4677 | !test_bit(STRIPE_DISCARD, &sh->state) && | |
f8dfcffd N |
4678 | test_and_clear_bit(STRIPE_SYNC_REQUESTED, &sh->state)) { |
4679 | set_bit(STRIPE_SYNCING, &sh->state); | |
4680 | clear_bit(STRIPE_INSYNC, &sh->state); | |
f94c0b66 | 4681 | clear_bit(STRIPE_REPLACED, &sh->state); |
f8dfcffd N |
4682 | } |
4683 | spin_unlock(&sh->stripe_lock); | |
cc94015a N |
4684 | } |
4685 | clear_bit(STRIPE_DELAYED, &sh->state); | |
4686 | ||
4687 | pr_debug("handling stripe %llu, state=%#lx cnt=%d, " | |
4688 | "pd_idx=%d, qd_idx=%d\n, check:%d, reconstruct:%d\n", | |
4689 | (unsigned long long)sh->sector, sh->state, | |
4690 | atomic_read(&sh->count), sh->pd_idx, sh->qd_idx, | |
4691 | sh->check_state, sh->reconstruct_state); | |
3687c061 | 4692 | |
acfe726b | 4693 | analyse_stripe(sh, &s); |
c5a31000 | 4694 | |
b70abcb2 SL |
4695 | if (test_bit(STRIPE_LOG_TRAPPED, &sh->state)) |
4696 | goto finish; | |
4697 | ||
16d997b7 N |
4698 | if (s.handle_bad_blocks || |
4699 | test_bit(MD_SB_CHANGE_PENDING, &conf->mddev->sb_flags)) { | |
bc2607f3 N |
4700 | set_bit(STRIPE_HANDLE, &sh->state); |
4701 | goto finish; | |
4702 | } | |
4703 | ||
474af965 N |
4704 | if (unlikely(s.blocked_rdev)) { |
4705 | if (s.syncing || s.expanding || s.expanded || | |
9a3e1101 | 4706 | s.replacing || s.to_write || s.written) { |
474af965 N |
4707 | set_bit(STRIPE_HANDLE, &sh->state); |
4708 | goto finish; | |
4709 | } | |
4710 | /* There is nothing for the blocked_rdev to block */ | |
4711 | rdev_dec_pending(s.blocked_rdev, conf->mddev); | |
4712 | s.blocked_rdev = NULL; | |
4713 | } | |
4714 | ||
4715 | if (s.to_fill && !test_bit(STRIPE_BIOFILL_RUN, &sh->state)) { | |
4716 | set_bit(STRIPE_OP_BIOFILL, &s.ops_request); | |
4717 | set_bit(STRIPE_BIOFILL_RUN, &sh->state); | |
4718 | } | |
4719 | ||
4720 | pr_debug("locked=%d uptodate=%d to_read=%d" | |
4721 | " to_write=%d failed=%d failed_num=%d,%d\n", | |
4722 | s.locked, s.uptodate, s.to_read, s.to_write, s.failed, | |
4723 | s.failed_num[0], s.failed_num[1]); | |
70d466f7 SL |
4724 | /* |
4725 | * check if the array has lost more than max_degraded devices and, | |
474af965 | 4726 | * if so, some requests might need to be failed. |
70d466f7 SL |
4727 | * |
4728 | * When journal device failed (log_failed), we will only process | |
4729 | * the stripe if there is data need write to raid disks | |
474af965 | 4730 | */ |
70d466f7 SL |
4731 | if (s.failed > conf->max_degraded || |
4732 | (s.log_failed && s.injournal == 0)) { | |
9a3f530f N |
4733 | sh->check_state = 0; |
4734 | sh->reconstruct_state = 0; | |
626f2092 | 4735 | break_stripe_batch_list(sh, 0); |
9a3f530f | 4736 | if (s.to_read+s.to_write+s.written) |
bd83d0a2 | 4737 | handle_failed_stripe(conf, sh, &s, disks); |
9a3e1101 | 4738 | if (s.syncing + s.replacing) |
9a3f530f N |
4739 | handle_failed_sync(conf, sh, &s); |
4740 | } | |
474af965 | 4741 | |
84789554 N |
4742 | /* Now we check to see if any write operations have recently |
4743 | * completed | |
4744 | */ | |
4745 | prexor = 0; | |
4746 | if (sh->reconstruct_state == reconstruct_state_prexor_drain_result) | |
4747 | prexor = 1; | |
4748 | if (sh->reconstruct_state == reconstruct_state_drain_result || | |
4749 | sh->reconstruct_state == reconstruct_state_prexor_drain_result) { | |
4750 | sh->reconstruct_state = reconstruct_state_idle; | |
4751 | ||
4752 | /* All the 'written' buffers and the parity block are ready to | |
4753 | * be written back to disk | |
4754 | */ | |
9e444768 SL |
4755 | BUG_ON(!test_bit(R5_UPTODATE, &sh->dev[sh->pd_idx].flags) && |
4756 | !test_bit(R5_Discard, &sh->dev[sh->pd_idx].flags)); | |
84789554 | 4757 | BUG_ON(sh->qd_idx >= 0 && |
9e444768 SL |
4758 | !test_bit(R5_UPTODATE, &sh->dev[sh->qd_idx].flags) && |
4759 | !test_bit(R5_Discard, &sh->dev[sh->qd_idx].flags)); | |
84789554 N |
4760 | for (i = disks; i--; ) { |
4761 | struct r5dev *dev = &sh->dev[i]; | |
4762 | if (test_bit(R5_LOCKED, &dev->flags) && | |
4763 | (i == sh->pd_idx || i == sh->qd_idx || | |
1e6d690b SL |
4764 | dev->written || test_bit(R5_InJournal, |
4765 | &dev->flags))) { | |
84789554 N |
4766 | pr_debug("Writing block %d\n", i); |
4767 | set_bit(R5_Wantwrite, &dev->flags); | |
4768 | if (prexor) | |
4769 | continue; | |
9c4bdf69 N |
4770 | if (s.failed > 1) |
4771 | continue; | |
84789554 N |
4772 | if (!test_bit(R5_Insync, &dev->flags) || |
4773 | ((i == sh->pd_idx || i == sh->qd_idx) && | |
4774 | s.failed == 0)) | |
4775 | set_bit(STRIPE_INSYNC, &sh->state); | |
4776 | } | |
4777 | } | |
4778 | if (test_and_clear_bit(STRIPE_PREREAD_ACTIVE, &sh->state)) | |
4779 | s.dec_preread_active = 1; | |
4780 | } | |
4781 | ||
ef5b7c69 N |
4782 | /* |
4783 | * might be able to return some write requests if the parity blocks | |
4784 | * are safe, or on a failed drive | |
4785 | */ | |
4786 | pdev = &sh->dev[sh->pd_idx]; | |
4787 | s.p_failed = (s.failed >= 1 && s.failed_num[0] == sh->pd_idx) | |
4788 | || (s.failed >= 2 && s.failed_num[1] == sh->pd_idx); | |
4789 | qdev = &sh->dev[sh->qd_idx]; | |
4790 | s.q_failed = (s.failed >= 1 && s.failed_num[0] == sh->qd_idx) | |
4791 | || (s.failed >= 2 && s.failed_num[1] == sh->qd_idx) | |
4792 | || conf->level < 6; | |
4793 | ||
4794 | if (s.written && | |
4795 | (s.p_failed || ((test_bit(R5_Insync, &pdev->flags) | |
4796 | && !test_bit(R5_LOCKED, &pdev->flags) | |
4797 | && (test_bit(R5_UPTODATE, &pdev->flags) || | |
4798 | test_bit(R5_Discard, &pdev->flags))))) && | |
4799 | (s.q_failed || ((test_bit(R5_Insync, &qdev->flags) | |
4800 | && !test_bit(R5_LOCKED, &qdev->flags) | |
4801 | && (test_bit(R5_UPTODATE, &qdev->flags) || | |
4802 | test_bit(R5_Discard, &qdev->flags)))))) | |
bd83d0a2 | 4803 | handle_stripe_clean_event(conf, sh, disks); |
ef5b7c69 | 4804 | |
1e6d690b | 4805 | if (s.just_cached) |
bd83d0a2 | 4806 | r5c_handle_cached_data_endio(conf, sh, disks); |
ff875738 | 4807 | log_stripe_write_finished(sh); |
1e6d690b | 4808 | |
ef5b7c69 N |
4809 | /* Now we might consider reading some blocks, either to check/generate |
4810 | * parity, or to satisfy requests | |
4811 | * or to load a block that is being partially written. | |
4812 | */ | |
4813 | if (s.to_read || s.non_overwrite | |
4814 | || (conf->level == 6 && s.to_write && s.failed) | |
4815 | || (s.syncing && (s.uptodate + s.compute < disks)) | |
4816 | || s.replacing | |
4817 | || s.expanding) | |
4818 | handle_stripe_fill(sh, &s, disks); | |
4819 | ||
2ded3703 SL |
4820 | /* |
4821 | * When the stripe finishes full journal write cycle (write to journal | |
4822 | * and raid disk), this is the clean up procedure so it is ready for | |
4823 | * next operation. | |
4824 | */ | |
4825 | r5c_finish_stripe_write_out(conf, sh, &s); | |
4826 | ||
4827 | /* | |
4828 | * Now to consider new write requests, cache write back and what else, | |
4829 | * if anything should be read. We do not handle new writes when: | |
84789554 N |
4830 | * 1/ A 'write' operation (copy+xor) is already in flight. |
4831 | * 2/ A 'check' operation is in flight, as it may clobber the parity | |
4832 | * block. | |
2ded3703 | 4833 | * 3/ A r5c cache log write is in flight. |
84789554 | 4834 | */ |
2ded3703 SL |
4835 | |
4836 | if (!sh->reconstruct_state && !sh->check_state && !sh->log_io) { | |
4837 | if (!r5c_is_writeback(conf->log)) { | |
4838 | if (s.to_write) | |
4839 | handle_stripe_dirtying(conf, sh, &s, disks); | |
4840 | } else { /* write back cache */ | |
4841 | int ret = 0; | |
4842 | ||
4843 | /* First, try handle writes in caching phase */ | |
4844 | if (s.to_write) | |
4845 | ret = r5c_try_caching_write(conf, sh, &s, | |
4846 | disks); | |
4847 | /* | |
4848 | * If caching phase failed: ret == -EAGAIN | |
4849 | * OR | |
4850 | * stripe under reclaim: !caching && injournal | |
4851 | * | |
4852 | * fall back to handle_stripe_dirtying() | |
4853 | */ | |
4854 | if (ret == -EAGAIN || | |
4855 | /* stripe under reclaim: !caching && injournal */ | |
4856 | (!test_bit(STRIPE_R5C_CACHING, &sh->state) && | |
d7bd398e SL |
4857 | s.injournal > 0)) { |
4858 | ret = handle_stripe_dirtying(conf, sh, &s, | |
4859 | disks); | |
4860 | if (ret == -EAGAIN) | |
4861 | goto finish; | |
4862 | } | |
2ded3703 SL |
4863 | } |
4864 | } | |
84789554 N |
4865 | |
4866 | /* maybe we need to check and possibly fix the parity for this stripe | |
4867 | * Any reads will already have been scheduled, so we just see if enough | |
4868 | * data is available. The parity check is held off while parity | |
4869 | * dependent operations are in flight. | |
4870 | */ | |
4871 | if (sh->check_state || | |
4872 | (s.syncing && s.locked == 0 && | |
4873 | !test_bit(STRIPE_COMPUTE_RUN, &sh->state) && | |
4874 | !test_bit(STRIPE_INSYNC, &sh->state))) { | |
4875 | if (conf->level == 6) | |
4876 | handle_parity_checks6(conf, sh, &s, disks); | |
4877 | else | |
4878 | handle_parity_checks5(conf, sh, &s, disks); | |
4879 | } | |
c5a31000 | 4880 | |
f94c0b66 N |
4881 | if ((s.replacing || s.syncing) && s.locked == 0 |
4882 | && !test_bit(STRIPE_COMPUTE_RUN, &sh->state) | |
4883 | && !test_bit(STRIPE_REPLACED, &sh->state)) { | |
9a3e1101 N |
4884 | /* Write out to replacement devices where possible */ |
4885 | for (i = 0; i < conf->raid_disks; i++) | |
f94c0b66 N |
4886 | if (test_bit(R5_NeedReplace, &sh->dev[i].flags)) { |
4887 | WARN_ON(!test_bit(R5_UPTODATE, &sh->dev[i].flags)); | |
9a3e1101 N |
4888 | set_bit(R5_WantReplace, &sh->dev[i].flags); |
4889 | set_bit(R5_LOCKED, &sh->dev[i].flags); | |
4890 | s.locked++; | |
4891 | } | |
f94c0b66 N |
4892 | if (s.replacing) |
4893 | set_bit(STRIPE_INSYNC, &sh->state); | |
4894 | set_bit(STRIPE_REPLACED, &sh->state); | |
9a3e1101 N |
4895 | } |
4896 | if ((s.syncing || s.replacing) && s.locked == 0 && | |
f94c0b66 | 4897 | !test_bit(STRIPE_COMPUTE_RUN, &sh->state) && |
9a3e1101 | 4898 | test_bit(STRIPE_INSYNC, &sh->state)) { |
c5a31000 N |
4899 | md_done_sync(conf->mddev, STRIPE_SECTORS, 1); |
4900 | clear_bit(STRIPE_SYNCING, &sh->state); | |
f8dfcffd N |
4901 | if (test_and_clear_bit(R5_Overlap, &sh->dev[sh->pd_idx].flags)) |
4902 | wake_up(&conf->wait_for_overlap); | |
c5a31000 N |
4903 | } |
4904 | ||
4905 | /* If the failed drives are just a ReadError, then we might need | |
4906 | * to progress the repair/check process | |
4907 | */ | |
4908 | if (s.failed <= conf->max_degraded && !conf->mddev->ro) | |
4909 | for (i = 0; i < s.failed; i++) { | |
4910 | struct r5dev *dev = &sh->dev[s.failed_num[i]]; | |
4911 | if (test_bit(R5_ReadError, &dev->flags) | |
4912 | && !test_bit(R5_LOCKED, &dev->flags) | |
4913 | && test_bit(R5_UPTODATE, &dev->flags) | |
4914 | ) { | |
4915 | if (!test_bit(R5_ReWrite, &dev->flags)) { | |
4916 | set_bit(R5_Wantwrite, &dev->flags); | |
4917 | set_bit(R5_ReWrite, &dev->flags); | |
4918 | set_bit(R5_LOCKED, &dev->flags); | |
4919 | s.locked++; | |
4920 | } else { | |
4921 | /* let's read it back */ | |
4922 | set_bit(R5_Wantread, &dev->flags); | |
4923 | set_bit(R5_LOCKED, &dev->flags); | |
4924 | s.locked++; | |
4925 | } | |
4926 | } | |
4927 | } | |
4928 | ||
3687c061 N |
4929 | /* Finish reconstruct operations initiated by the expansion process */ |
4930 | if (sh->reconstruct_state == reconstruct_state_result) { | |
4931 | struct stripe_head *sh_src | |
6d036f7d | 4932 | = raid5_get_active_stripe(conf, sh->sector, 1, 1, 1); |
3687c061 N |
4933 | if (sh_src && test_bit(STRIPE_EXPAND_SOURCE, &sh_src->state)) { |
4934 | /* sh cannot be written until sh_src has been read. | |
4935 | * so arrange for sh to be delayed a little | |
4936 | */ | |
4937 | set_bit(STRIPE_DELAYED, &sh->state); | |
4938 | set_bit(STRIPE_HANDLE, &sh->state); | |
4939 | if (!test_and_set_bit(STRIPE_PREREAD_ACTIVE, | |
4940 | &sh_src->state)) | |
4941 | atomic_inc(&conf->preread_active_stripes); | |
6d036f7d | 4942 | raid5_release_stripe(sh_src); |
3687c061 N |
4943 | goto finish; |
4944 | } | |
4945 | if (sh_src) | |
6d036f7d | 4946 | raid5_release_stripe(sh_src); |
3687c061 N |
4947 | |
4948 | sh->reconstruct_state = reconstruct_state_idle; | |
4949 | clear_bit(STRIPE_EXPANDING, &sh->state); | |
4950 | for (i = conf->raid_disks; i--; ) { | |
4951 | set_bit(R5_Wantwrite, &sh->dev[i].flags); | |
4952 | set_bit(R5_LOCKED, &sh->dev[i].flags); | |
4953 | s.locked++; | |
4954 | } | |
4955 | } | |
f416885e | 4956 | |
3687c061 N |
4957 | if (s.expanded && test_bit(STRIPE_EXPANDING, &sh->state) && |
4958 | !sh->reconstruct_state) { | |
4959 | /* Need to write out all blocks after computing parity */ | |
4960 | sh->disks = conf->raid_disks; | |
4961 | stripe_set_idx(sh->sector, conf, 0, sh); | |
4962 | schedule_reconstruction(sh, &s, 1, 1); | |
4963 | } else if (s.expanded && !sh->reconstruct_state && s.locked == 0) { | |
4964 | clear_bit(STRIPE_EXPAND_READY, &sh->state); | |
4965 | atomic_dec(&conf->reshape_stripes); | |
4966 | wake_up(&conf->wait_for_overlap); | |
4967 | md_done_sync(conf->mddev, STRIPE_SECTORS, 1); | |
4968 | } | |
4969 | ||
4970 | if (s.expanding && s.locked == 0 && | |
4971 | !test_bit(STRIPE_COMPUTE_RUN, &sh->state)) | |
4972 | handle_stripe_expansion(conf, sh); | |
16a53ecc | 4973 | |
3687c061 | 4974 | finish: |
6bfe0b49 | 4975 | /* wait for this device to become unblocked */ |
5f066c63 N |
4976 | if (unlikely(s.blocked_rdev)) { |
4977 | if (conf->mddev->external) | |
4978 | md_wait_for_blocked_rdev(s.blocked_rdev, | |
4979 | conf->mddev); | |
4980 | else | |
4981 | /* Internal metadata will immediately | |
4982 | * be written by raid5d, so we don't | |
4983 | * need to wait here. | |
4984 | */ | |
4985 | rdev_dec_pending(s.blocked_rdev, | |
4986 | conf->mddev); | |
4987 | } | |
6bfe0b49 | 4988 | |
bc2607f3 N |
4989 | if (s.handle_bad_blocks) |
4990 | for (i = disks; i--; ) { | |
3cb03002 | 4991 | struct md_rdev *rdev; |
bc2607f3 N |
4992 | struct r5dev *dev = &sh->dev[i]; |
4993 | if (test_and_clear_bit(R5_WriteError, &dev->flags)) { | |
4994 | /* We own a safe reference to the rdev */ | |
4995 | rdev = conf->disks[i].rdev; | |
4996 | if (!rdev_set_badblocks(rdev, sh->sector, | |
4997 | STRIPE_SECTORS, 0)) | |
4998 | md_error(conf->mddev, rdev); | |
4999 | rdev_dec_pending(rdev, conf->mddev); | |
5000 | } | |
b84db560 N |
5001 | if (test_and_clear_bit(R5_MadeGood, &dev->flags)) { |
5002 | rdev = conf->disks[i].rdev; | |
5003 | rdev_clear_badblocks(rdev, sh->sector, | |
c6563a8c | 5004 | STRIPE_SECTORS, 0); |
b84db560 N |
5005 | rdev_dec_pending(rdev, conf->mddev); |
5006 | } | |
977df362 N |
5007 | if (test_and_clear_bit(R5_MadeGoodRepl, &dev->flags)) { |
5008 | rdev = conf->disks[i].replacement; | |
dd054fce N |
5009 | if (!rdev) |
5010 | /* rdev have been moved down */ | |
5011 | rdev = conf->disks[i].rdev; | |
977df362 | 5012 | rdev_clear_badblocks(rdev, sh->sector, |
c6563a8c | 5013 | STRIPE_SECTORS, 0); |
977df362 N |
5014 | rdev_dec_pending(rdev, conf->mddev); |
5015 | } | |
bc2607f3 N |
5016 | } |
5017 | ||
6c0069c0 YT |
5018 | if (s.ops_request) |
5019 | raid_run_ops(sh, s.ops_request); | |
5020 | ||
f0e43bcd | 5021 | ops_run_io(sh, &s); |
16a53ecc | 5022 | |
c5709ef6 | 5023 | if (s.dec_preread_active) { |
729a1866 | 5024 | /* We delay this until after ops_run_io so that if make_request |
e9c7469b | 5025 | * is waiting on a flush, it won't continue until the writes |
729a1866 N |
5026 | * have actually been submitted. |
5027 | */ | |
5028 | atomic_dec(&conf->preread_active_stripes); | |
5029 | if (atomic_read(&conf->preread_active_stripes) < | |
5030 | IO_THRESHOLD) | |
5031 | md_wakeup_thread(conf->mddev->thread); | |
5032 | } | |
5033 | ||
257a4b42 | 5034 | clear_bit_unlock(STRIPE_ACTIVE, &sh->state); |
16a53ecc N |
5035 | } |
5036 | ||
d1688a6d | 5037 | static void raid5_activate_delayed(struct r5conf *conf) |
16a53ecc N |
5038 | { |
5039 | if (atomic_read(&conf->preread_active_stripes) < IO_THRESHOLD) { | |
5040 | while (!list_empty(&conf->delayed_list)) { | |
5041 | struct list_head *l = conf->delayed_list.next; | |
5042 | struct stripe_head *sh; | |
5043 | sh = list_entry(l, struct stripe_head, lru); | |
5044 | list_del_init(l); | |
5045 | clear_bit(STRIPE_DELAYED, &sh->state); | |
5046 | if (!test_and_set_bit(STRIPE_PREREAD_ACTIVE, &sh->state)) | |
5047 | atomic_inc(&conf->preread_active_stripes); | |
8b3e6cdc | 5048 | list_add_tail(&sh->lru, &conf->hold_list); |
851c30c9 | 5049 | raid5_wakeup_stripe_thread(sh); |
16a53ecc | 5050 | } |
482c0834 | 5051 | } |
16a53ecc N |
5052 | } |
5053 | ||
566c09c5 SL |
5054 | static void activate_bit_delay(struct r5conf *conf, |
5055 | struct list_head *temp_inactive_list) | |
16a53ecc N |
5056 | { |
5057 | /* device_lock is held */ | |
5058 | struct list_head head; | |
5059 | list_add(&head, &conf->bitmap_list); | |
5060 | list_del_init(&conf->bitmap_list); | |
5061 | while (!list_empty(&head)) { | |
5062 | struct stripe_head *sh = list_entry(head.next, struct stripe_head, lru); | |
566c09c5 | 5063 | int hash; |
16a53ecc N |
5064 | list_del_init(&sh->lru); |
5065 | atomic_inc(&sh->count); | |
566c09c5 SL |
5066 | hash = sh->hash_lock_index; |
5067 | __release_stripe(conf, sh, &temp_inactive_list[hash]); | |
16a53ecc N |
5068 | } |
5069 | } | |
5070 | ||
5c675f83 | 5071 | static int raid5_congested(struct mddev *mddev, int bits) |
f022b2fd | 5072 | { |
d1688a6d | 5073 | struct r5conf *conf = mddev->private; |
f022b2fd N |
5074 | |
5075 | /* No difference between reads and writes. Just check | |
5076 | * how busy the stripe_cache is | |
5077 | */ | |
3fa841d7 | 5078 | |
5423399a | 5079 | if (test_bit(R5_INACTIVE_BLOCKED, &conf->cache_state)) |
f022b2fd | 5080 | return 1; |
a39f7afd SL |
5081 | |
5082 | /* Also checks whether there is pressure on r5cache log space */ | |
5083 | if (test_bit(R5C_LOG_TIGHT, &conf->cache_state)) | |
5084 | return 1; | |
f022b2fd N |
5085 | if (conf->quiesce) |
5086 | return 1; | |
4bda556a | 5087 | if (atomic_read(&conf->empty_inactive_list_nr)) |
f022b2fd N |
5088 | return 1; |
5089 | ||
5090 | return 0; | |
5091 | } | |
5092 | ||
fd01b88c | 5093 | static int in_chunk_boundary(struct mddev *mddev, struct bio *bio) |
f679623f | 5094 | { |
3cb5edf4 | 5095 | struct r5conf *conf = mddev->private; |
10433d04 | 5096 | sector_t sector = bio->bi_iter.bi_sector; |
3cb5edf4 | 5097 | unsigned int chunk_sectors; |
aa8b57aa | 5098 | unsigned int bio_sectors = bio_sectors(bio); |
f679623f | 5099 | |
10433d04 CH |
5100 | WARN_ON_ONCE(bio->bi_partno); |
5101 | ||
3cb5edf4 | 5102 | chunk_sectors = min(conf->chunk_sectors, conf->prev_chunk_sectors); |
f679623f RBJ |
5103 | return chunk_sectors >= |
5104 | ((sector & (chunk_sectors - 1)) + bio_sectors); | |
5105 | } | |
5106 | ||
46031f9a RBJ |
5107 | /* |
5108 | * add bio to the retry LIFO ( in O(1) ... we are in interrupt ) | |
5109 | * later sampled by raid5d. | |
5110 | */ | |
d1688a6d | 5111 | static void add_bio_to_retry(struct bio *bi,struct r5conf *conf) |
46031f9a RBJ |
5112 | { |
5113 | unsigned long flags; | |
5114 | ||
5115 | spin_lock_irqsave(&conf->device_lock, flags); | |
5116 | ||
5117 | bi->bi_next = conf->retry_read_aligned_list; | |
5118 | conf->retry_read_aligned_list = bi; | |
5119 | ||
5120 | spin_unlock_irqrestore(&conf->device_lock, flags); | |
5121 | md_wakeup_thread(conf->mddev->thread); | |
5122 | } | |
5123 | ||
0472a42b N |
5124 | static struct bio *remove_bio_from_retry(struct r5conf *conf, |
5125 | unsigned int *offset) | |
46031f9a RBJ |
5126 | { |
5127 | struct bio *bi; | |
5128 | ||
5129 | bi = conf->retry_read_aligned; | |
5130 | if (bi) { | |
0472a42b | 5131 | *offset = conf->retry_read_offset; |
46031f9a RBJ |
5132 | conf->retry_read_aligned = NULL; |
5133 | return bi; | |
5134 | } | |
5135 | bi = conf->retry_read_aligned_list; | |
5136 | if(bi) { | |
387bb173 | 5137 | conf->retry_read_aligned_list = bi->bi_next; |
46031f9a | 5138 | bi->bi_next = NULL; |
0472a42b | 5139 | *offset = 0; |
46031f9a RBJ |
5140 | } |
5141 | ||
5142 | return bi; | |
5143 | } | |
5144 | ||
f679623f RBJ |
5145 | /* |
5146 | * The "raid5_align_endio" should check if the read succeeded and if it | |
5147 | * did, call bio_endio on the original bio (having bio_put the new bio | |
5148 | * first). | |
5149 | * If the read failed.. | |
5150 | */ | |
4246a0b6 | 5151 | static void raid5_align_endio(struct bio *bi) |
f679623f RBJ |
5152 | { |
5153 | struct bio* raid_bi = bi->bi_private; | |
fd01b88c | 5154 | struct mddev *mddev; |
d1688a6d | 5155 | struct r5conf *conf; |
3cb03002 | 5156 | struct md_rdev *rdev; |
4e4cbee9 | 5157 | blk_status_t error = bi->bi_status; |
46031f9a | 5158 | |
f679623f | 5159 | bio_put(bi); |
46031f9a | 5160 | |
46031f9a RBJ |
5161 | rdev = (void*)raid_bi->bi_next; |
5162 | raid_bi->bi_next = NULL; | |
2b7f2228 N |
5163 | mddev = rdev->mddev; |
5164 | conf = mddev->private; | |
46031f9a RBJ |
5165 | |
5166 | rdev_dec_pending(rdev, conf->mddev); | |
5167 | ||
9b81c842 | 5168 | if (!error) { |
4246a0b6 | 5169 | bio_endio(raid_bi); |
46031f9a | 5170 | if (atomic_dec_and_test(&conf->active_aligned_reads)) |
b1b46486 | 5171 | wake_up(&conf->wait_for_quiescent); |
6712ecf8 | 5172 | return; |
46031f9a RBJ |
5173 | } |
5174 | ||
45b4233c | 5175 | pr_debug("raid5_align_endio : io error...handing IO for a retry\n"); |
46031f9a RBJ |
5176 | |
5177 | add_bio_to_retry(raid_bi, conf); | |
f679623f RBJ |
5178 | } |
5179 | ||
7ef6b12a | 5180 | static int raid5_read_one_chunk(struct mddev *mddev, struct bio *raid_bio) |
f679623f | 5181 | { |
d1688a6d | 5182 | struct r5conf *conf = mddev->private; |
8553fe7e | 5183 | int dd_idx; |
f679623f | 5184 | struct bio* align_bi; |
3cb03002 | 5185 | struct md_rdev *rdev; |
671488cc | 5186 | sector_t end_sector; |
f679623f RBJ |
5187 | |
5188 | if (!in_chunk_boundary(mddev, raid_bio)) { | |
7ef6b12a | 5189 | pr_debug("%s: non aligned\n", __func__); |
f679623f RBJ |
5190 | return 0; |
5191 | } | |
5192 | /* | |
d7a10308 | 5193 | * use bio_clone_fast to make a copy of the bio |
f679623f | 5194 | */ |
d7a10308 | 5195 | align_bi = bio_clone_fast(raid_bio, GFP_NOIO, mddev->bio_set); |
f679623f RBJ |
5196 | if (!align_bi) |
5197 | return 0; | |
5198 | /* | |
5199 | * set bi_end_io to a new function, and set bi_private to the | |
5200 | * original bio. | |
5201 | */ | |
5202 | align_bi->bi_end_io = raid5_align_endio; | |
5203 | align_bi->bi_private = raid_bio; | |
5204 | /* | |
5205 | * compute position | |
5206 | */ | |
4f024f37 KO |
5207 | align_bi->bi_iter.bi_sector = |
5208 | raid5_compute_sector(conf, raid_bio->bi_iter.bi_sector, | |
5209 | 0, &dd_idx, NULL); | |
f679623f | 5210 | |
f73a1c7d | 5211 | end_sector = bio_end_sector(align_bi); |
f679623f | 5212 | rcu_read_lock(); |
671488cc N |
5213 | rdev = rcu_dereference(conf->disks[dd_idx].replacement); |
5214 | if (!rdev || test_bit(Faulty, &rdev->flags) || | |
5215 | rdev->recovery_offset < end_sector) { | |
5216 | rdev = rcu_dereference(conf->disks[dd_idx].rdev); | |
5217 | if (rdev && | |
5218 | (test_bit(Faulty, &rdev->flags) || | |
5219 | !(test_bit(In_sync, &rdev->flags) || | |
5220 | rdev->recovery_offset >= end_sector))) | |
5221 | rdev = NULL; | |
5222 | } | |
03b047f4 SL |
5223 | |
5224 | if (r5c_big_stripe_cached(conf, align_bi->bi_iter.bi_sector)) { | |
5225 | rcu_read_unlock(); | |
5226 | bio_put(align_bi); | |
5227 | return 0; | |
5228 | } | |
5229 | ||
671488cc | 5230 | if (rdev) { |
31c176ec N |
5231 | sector_t first_bad; |
5232 | int bad_sectors; | |
5233 | ||
f679623f RBJ |
5234 | atomic_inc(&rdev->nr_pending); |
5235 | rcu_read_unlock(); | |
46031f9a | 5236 | raid_bio->bi_next = (void*)rdev; |
74d46992 | 5237 | bio_set_dev(align_bi, rdev->bdev); |
b7c44ed9 | 5238 | bio_clear_flag(align_bi, BIO_SEG_VALID); |
46031f9a | 5239 | |
7140aafc | 5240 | if (is_badblock(rdev, align_bi->bi_iter.bi_sector, |
4f024f37 | 5241 | bio_sectors(align_bi), |
31c176ec | 5242 | &first_bad, &bad_sectors)) { |
387bb173 NB |
5243 | bio_put(align_bi); |
5244 | rdev_dec_pending(rdev, mddev); | |
5245 | return 0; | |
5246 | } | |
5247 | ||
6c0544e2 | 5248 | /* No reshape active, so we can trust rdev->data_offset */ |
4f024f37 | 5249 | align_bi->bi_iter.bi_sector += rdev->data_offset; |
6c0544e2 | 5250 | |
46031f9a | 5251 | spin_lock_irq(&conf->device_lock); |
b1b46486 | 5252 | wait_event_lock_irq(conf->wait_for_quiescent, |
46031f9a | 5253 | conf->quiesce == 0, |
eed8c02e | 5254 | conf->device_lock); |
46031f9a RBJ |
5255 | atomic_inc(&conf->active_aligned_reads); |
5256 | spin_unlock_irq(&conf->device_lock); | |
5257 | ||
e3620a3a | 5258 | if (mddev->gendisk) |
74d46992 | 5259 | trace_block_bio_remap(align_bi->bi_disk->queue, |
e3620a3a | 5260 | align_bi, disk_devt(mddev->gendisk), |
4f024f37 | 5261 | raid_bio->bi_iter.bi_sector); |
f679623f RBJ |
5262 | generic_make_request(align_bi); |
5263 | return 1; | |
5264 | } else { | |
5265 | rcu_read_unlock(); | |
46031f9a | 5266 | bio_put(align_bi); |
f679623f RBJ |
5267 | return 0; |
5268 | } | |
5269 | } | |
5270 | ||
7ef6b12a ML |
5271 | static struct bio *chunk_aligned_read(struct mddev *mddev, struct bio *raid_bio) |
5272 | { | |
5273 | struct bio *split; | |
dd7a8f5d N |
5274 | sector_t sector = raid_bio->bi_iter.bi_sector; |
5275 | unsigned chunk_sects = mddev->chunk_sectors; | |
5276 | unsigned sectors = chunk_sects - (sector & (chunk_sects-1)); | |
7ef6b12a | 5277 | |
dd7a8f5d N |
5278 | if (sectors < bio_sectors(raid_bio)) { |
5279 | struct r5conf *conf = mddev->private; | |
5280 | split = bio_split(raid_bio, sectors, GFP_NOIO, conf->bio_split); | |
5281 | bio_chain(split, raid_bio); | |
5282 | generic_make_request(raid_bio); | |
5283 | raid_bio = split; | |
5284 | } | |
7ef6b12a | 5285 | |
dd7a8f5d N |
5286 | if (!raid5_read_one_chunk(mddev, raid_bio)) |
5287 | return raid_bio; | |
7ef6b12a ML |
5288 | |
5289 | return NULL; | |
5290 | } | |
5291 | ||
8b3e6cdc DW |
5292 | /* __get_priority_stripe - get the next stripe to process |
5293 | * | |
5294 | * Full stripe writes are allowed to pass preread active stripes up until | |
5295 | * the bypass_threshold is exceeded. In general the bypass_count | |
5296 | * increments when the handle_list is handled before the hold_list; however, it | |
5297 | * will not be incremented when STRIPE_IO_STARTED is sampled set signifying a | |
5298 | * stripe with in flight i/o. The bypass_count will be reset when the | |
5299 | * head of the hold_list has changed, i.e. the head was promoted to the | |
5300 | * handle_list. | |
5301 | */ | |
851c30c9 | 5302 | static struct stripe_head *__get_priority_stripe(struct r5conf *conf, int group) |
8b3e6cdc | 5303 | { |
535ae4eb | 5304 | struct stripe_head *sh, *tmp; |
851c30c9 | 5305 | struct list_head *handle_list = NULL; |
535ae4eb | 5306 | struct r5worker_group *wg; |
70d466f7 SL |
5307 | bool second_try = !r5c_is_writeback(conf->log) && |
5308 | !r5l_log_disk_error(conf); | |
5309 | bool try_loprio = test_bit(R5C_LOG_TIGHT, &conf->cache_state) || | |
5310 | r5l_log_disk_error(conf); | |
851c30c9 | 5311 | |
535ae4eb SL |
5312 | again: |
5313 | wg = NULL; | |
5314 | sh = NULL; | |
851c30c9 | 5315 | if (conf->worker_cnt_per_group == 0) { |
535ae4eb SL |
5316 | handle_list = try_loprio ? &conf->loprio_list : |
5317 | &conf->handle_list; | |
851c30c9 | 5318 | } else if (group != ANY_GROUP) { |
535ae4eb SL |
5319 | handle_list = try_loprio ? &conf->worker_groups[group].loprio_list : |
5320 | &conf->worker_groups[group].handle_list; | |
bfc90cb0 | 5321 | wg = &conf->worker_groups[group]; |
851c30c9 SL |
5322 | } else { |
5323 | int i; | |
5324 | for (i = 0; i < conf->group_cnt; i++) { | |
535ae4eb SL |
5325 | handle_list = try_loprio ? &conf->worker_groups[i].loprio_list : |
5326 | &conf->worker_groups[i].handle_list; | |
bfc90cb0 | 5327 | wg = &conf->worker_groups[i]; |
851c30c9 SL |
5328 | if (!list_empty(handle_list)) |
5329 | break; | |
5330 | } | |
5331 | } | |
8b3e6cdc DW |
5332 | |
5333 | pr_debug("%s: handle: %s hold: %s full_writes: %d bypass_count: %d\n", | |
5334 | __func__, | |
851c30c9 | 5335 | list_empty(handle_list) ? "empty" : "busy", |
8b3e6cdc DW |
5336 | list_empty(&conf->hold_list) ? "empty" : "busy", |
5337 | atomic_read(&conf->pending_full_writes), conf->bypass_count); | |
5338 | ||
851c30c9 SL |
5339 | if (!list_empty(handle_list)) { |
5340 | sh = list_entry(handle_list->next, typeof(*sh), lru); | |
8b3e6cdc DW |
5341 | |
5342 | if (list_empty(&conf->hold_list)) | |
5343 | conf->bypass_count = 0; | |
5344 | else if (!test_bit(STRIPE_IO_STARTED, &sh->state)) { | |
5345 | if (conf->hold_list.next == conf->last_hold) | |
5346 | conf->bypass_count++; | |
5347 | else { | |
5348 | conf->last_hold = conf->hold_list.next; | |
5349 | conf->bypass_count -= conf->bypass_threshold; | |
5350 | if (conf->bypass_count < 0) | |
5351 | conf->bypass_count = 0; | |
5352 | } | |
5353 | } | |
5354 | } else if (!list_empty(&conf->hold_list) && | |
5355 | ((conf->bypass_threshold && | |
5356 | conf->bypass_count > conf->bypass_threshold) || | |
5357 | atomic_read(&conf->pending_full_writes) == 0)) { | |
851c30c9 SL |
5358 | |
5359 | list_for_each_entry(tmp, &conf->hold_list, lru) { | |
5360 | if (conf->worker_cnt_per_group == 0 || | |
5361 | group == ANY_GROUP || | |
5362 | !cpu_online(tmp->cpu) || | |
5363 | cpu_to_group(tmp->cpu) == group) { | |
5364 | sh = tmp; | |
5365 | break; | |
5366 | } | |
5367 | } | |
5368 | ||
5369 | if (sh) { | |
5370 | conf->bypass_count -= conf->bypass_threshold; | |
5371 | if (conf->bypass_count < 0) | |
5372 | conf->bypass_count = 0; | |
5373 | } | |
bfc90cb0 | 5374 | wg = NULL; |
851c30c9 SL |
5375 | } |
5376 | ||
535ae4eb SL |
5377 | if (!sh) { |
5378 | if (second_try) | |
5379 | return NULL; | |
5380 | second_try = true; | |
5381 | try_loprio = !try_loprio; | |
5382 | goto again; | |
5383 | } | |
8b3e6cdc | 5384 | |
bfc90cb0 SL |
5385 | if (wg) { |
5386 | wg->stripes_cnt--; | |
5387 | sh->group = NULL; | |
5388 | } | |
8b3e6cdc | 5389 | list_del_init(&sh->lru); |
c7a6d35e | 5390 | BUG_ON(atomic_inc_return(&sh->count) != 1); |
8b3e6cdc DW |
5391 | return sh; |
5392 | } | |
f679623f | 5393 | |
8811b596 SL |
5394 | struct raid5_plug_cb { |
5395 | struct blk_plug_cb cb; | |
5396 | struct list_head list; | |
566c09c5 | 5397 | struct list_head temp_inactive_list[NR_STRIPE_HASH_LOCKS]; |
8811b596 SL |
5398 | }; |
5399 | ||
5400 | static void raid5_unplug(struct blk_plug_cb *blk_cb, bool from_schedule) | |
5401 | { | |
5402 | struct raid5_plug_cb *cb = container_of( | |
5403 | blk_cb, struct raid5_plug_cb, cb); | |
5404 | struct stripe_head *sh; | |
5405 | struct mddev *mddev = cb->cb.data; | |
5406 | struct r5conf *conf = mddev->private; | |
a9add5d9 | 5407 | int cnt = 0; |
566c09c5 | 5408 | int hash; |
8811b596 SL |
5409 | |
5410 | if (cb->list.next && !list_empty(&cb->list)) { | |
5411 | spin_lock_irq(&conf->device_lock); | |
5412 | while (!list_empty(&cb->list)) { | |
5413 | sh = list_first_entry(&cb->list, struct stripe_head, lru); | |
5414 | list_del_init(&sh->lru); | |
5415 | /* | |
5416 | * avoid race release_stripe_plug() sees | |
5417 | * STRIPE_ON_UNPLUG_LIST clear but the stripe | |
5418 | * is still in our list | |
5419 | */ | |
4e857c58 | 5420 | smp_mb__before_atomic(); |
8811b596 | 5421 | clear_bit(STRIPE_ON_UNPLUG_LIST, &sh->state); |
773ca82f SL |
5422 | /* |
5423 | * STRIPE_ON_RELEASE_LIST could be set here. In that | |
5424 | * case, the count is always > 1 here | |
5425 | */ | |
566c09c5 SL |
5426 | hash = sh->hash_lock_index; |
5427 | __release_stripe(conf, sh, &cb->temp_inactive_list[hash]); | |
a9add5d9 | 5428 | cnt++; |
8811b596 SL |
5429 | } |
5430 | spin_unlock_irq(&conf->device_lock); | |
5431 | } | |
566c09c5 SL |
5432 | release_inactive_stripe_list(conf, cb->temp_inactive_list, |
5433 | NR_STRIPE_HASH_LOCKS); | |
e3620a3a JB |
5434 | if (mddev->queue) |
5435 | trace_block_unplug(mddev->queue, cnt, !from_schedule); | |
8811b596 SL |
5436 | kfree(cb); |
5437 | } | |
5438 | ||
5439 | static void release_stripe_plug(struct mddev *mddev, | |
5440 | struct stripe_head *sh) | |
5441 | { | |
5442 | struct blk_plug_cb *blk_cb = blk_check_plugged( | |
5443 | raid5_unplug, mddev, | |
5444 | sizeof(struct raid5_plug_cb)); | |
5445 | struct raid5_plug_cb *cb; | |
5446 | ||
5447 | if (!blk_cb) { | |
6d036f7d | 5448 | raid5_release_stripe(sh); |
8811b596 SL |
5449 | return; |
5450 | } | |
5451 | ||
5452 | cb = container_of(blk_cb, struct raid5_plug_cb, cb); | |
5453 | ||
566c09c5 SL |
5454 | if (cb->list.next == NULL) { |
5455 | int i; | |
8811b596 | 5456 | INIT_LIST_HEAD(&cb->list); |
566c09c5 SL |
5457 | for (i = 0; i < NR_STRIPE_HASH_LOCKS; i++) |
5458 | INIT_LIST_HEAD(cb->temp_inactive_list + i); | |
5459 | } | |
8811b596 SL |
5460 | |
5461 | if (!test_and_set_bit(STRIPE_ON_UNPLUG_LIST, &sh->state)) | |
5462 | list_add_tail(&sh->lru, &cb->list); | |
5463 | else | |
6d036f7d | 5464 | raid5_release_stripe(sh); |
8811b596 SL |
5465 | } |
5466 | ||
620125f2 SL |
5467 | static void make_discard_request(struct mddev *mddev, struct bio *bi) |
5468 | { | |
5469 | struct r5conf *conf = mddev->private; | |
5470 | sector_t logical_sector, last_sector; | |
5471 | struct stripe_head *sh; | |
620125f2 SL |
5472 | int stripe_sectors; |
5473 | ||
5474 | if (mddev->reshape_position != MaxSector) | |
5475 | /* Skip discard while reshape is happening */ | |
5476 | return; | |
5477 | ||
4f024f37 KO |
5478 | logical_sector = bi->bi_iter.bi_sector & ~((sector_t)STRIPE_SECTORS-1); |
5479 | last_sector = bi->bi_iter.bi_sector + (bi->bi_iter.bi_size>>9); | |
620125f2 SL |
5480 | |
5481 | bi->bi_next = NULL; | |
620125f2 SL |
5482 | |
5483 | stripe_sectors = conf->chunk_sectors * | |
5484 | (conf->raid_disks - conf->max_degraded); | |
5485 | logical_sector = DIV_ROUND_UP_SECTOR_T(logical_sector, | |
5486 | stripe_sectors); | |
5487 | sector_div(last_sector, stripe_sectors); | |
5488 | ||
5489 | logical_sector *= conf->chunk_sectors; | |
5490 | last_sector *= conf->chunk_sectors; | |
5491 | ||
5492 | for (; logical_sector < last_sector; | |
5493 | logical_sector += STRIPE_SECTORS) { | |
5494 | DEFINE_WAIT(w); | |
5495 | int d; | |
5496 | again: | |
6d036f7d | 5497 | sh = raid5_get_active_stripe(conf, logical_sector, 0, 0, 0); |
620125f2 SL |
5498 | prepare_to_wait(&conf->wait_for_overlap, &w, |
5499 | TASK_UNINTERRUPTIBLE); | |
f8dfcffd N |
5500 | set_bit(R5_Overlap, &sh->dev[sh->pd_idx].flags); |
5501 | if (test_bit(STRIPE_SYNCING, &sh->state)) { | |
6d036f7d | 5502 | raid5_release_stripe(sh); |
f8dfcffd N |
5503 | schedule(); |
5504 | goto again; | |
5505 | } | |
5506 | clear_bit(R5_Overlap, &sh->dev[sh->pd_idx].flags); | |
620125f2 SL |
5507 | spin_lock_irq(&sh->stripe_lock); |
5508 | for (d = 0; d < conf->raid_disks; d++) { | |
5509 | if (d == sh->pd_idx || d == sh->qd_idx) | |
5510 | continue; | |
5511 | if (sh->dev[d].towrite || sh->dev[d].toread) { | |
5512 | set_bit(R5_Overlap, &sh->dev[d].flags); | |
5513 | spin_unlock_irq(&sh->stripe_lock); | |
6d036f7d | 5514 | raid5_release_stripe(sh); |
620125f2 SL |
5515 | schedule(); |
5516 | goto again; | |
5517 | } | |
5518 | } | |
f8dfcffd | 5519 | set_bit(STRIPE_DISCARD, &sh->state); |
620125f2 | 5520 | finish_wait(&conf->wait_for_overlap, &w); |
7a87f434 | 5521 | sh->overwrite_disks = 0; |
620125f2 SL |
5522 | for (d = 0; d < conf->raid_disks; d++) { |
5523 | if (d == sh->pd_idx || d == sh->qd_idx) | |
5524 | continue; | |
5525 | sh->dev[d].towrite = bi; | |
5526 | set_bit(R5_OVERWRITE, &sh->dev[d].flags); | |
016c76ac | 5527 | bio_inc_remaining(bi); |
49728050 | 5528 | md_write_inc(mddev, bi); |
7a87f434 | 5529 | sh->overwrite_disks++; |
620125f2 SL |
5530 | } |
5531 | spin_unlock_irq(&sh->stripe_lock); | |
5532 | if (conf->mddev->bitmap) { | |
5533 | for (d = 0; | |
5534 | d < conf->raid_disks - conf->max_degraded; | |
5535 | d++) | |
5536 | bitmap_startwrite(mddev->bitmap, | |
5537 | sh->sector, | |
5538 | STRIPE_SECTORS, | |
5539 | 0); | |
5540 | sh->bm_seq = conf->seq_flush + 1; | |
5541 | set_bit(STRIPE_BIT_DELAY, &sh->state); | |
5542 | } | |
5543 | ||
5544 | set_bit(STRIPE_HANDLE, &sh->state); | |
5545 | clear_bit(STRIPE_DELAYED, &sh->state); | |
5546 | if (!test_and_set_bit(STRIPE_PREREAD_ACTIVE, &sh->state)) | |
5547 | atomic_inc(&conf->preread_active_stripes); | |
5548 | release_stripe_plug(mddev, sh); | |
5549 | } | |
5550 | ||
016c76ac | 5551 | bio_endio(bi); |
620125f2 SL |
5552 | } |
5553 | ||
cc27b0c7 | 5554 | static bool raid5_make_request(struct mddev *mddev, struct bio * bi) |
1da177e4 | 5555 | { |
d1688a6d | 5556 | struct r5conf *conf = mddev->private; |
911d4ee8 | 5557 | int dd_idx; |
1da177e4 LT |
5558 | sector_t new_sector; |
5559 | sector_t logical_sector, last_sector; | |
5560 | struct stripe_head *sh; | |
a362357b | 5561 | const int rw = bio_data_dir(bi); |
27c0f68f SL |
5562 | DEFINE_WAIT(w); |
5563 | bool do_prepare; | |
3bddb7f8 | 5564 | bool do_flush = false; |
1da177e4 | 5565 | |
1eff9d32 | 5566 | if (unlikely(bi->bi_opf & REQ_PREFLUSH)) { |
1532d9e8 | 5567 | int ret = log_handle_flush_request(conf, bi); |
828cbe98 SL |
5568 | |
5569 | if (ret == 0) | |
cc27b0c7 | 5570 | return true; |
828cbe98 SL |
5571 | if (ret == -ENODEV) { |
5572 | md_flush_request(mddev, bi); | |
cc27b0c7 | 5573 | return true; |
828cbe98 SL |
5574 | } |
5575 | /* ret == -EAGAIN, fallback */ | |
3bddb7f8 SL |
5576 | /* |
5577 | * if r5l_handle_flush_request() didn't clear REQ_PREFLUSH, | |
5578 | * we need to flush journal device | |
5579 | */ | |
5580 | do_flush = bi->bi_opf & REQ_PREFLUSH; | |
e5dcdd80 N |
5581 | } |
5582 | ||
cc27b0c7 N |
5583 | if (!md_write_start(mddev, bi)) |
5584 | return false; | |
9ffc8f7c EM |
5585 | /* |
5586 | * If array is degraded, better not do chunk aligned read because | |
5587 | * later we might have to read it again in order to reconstruct | |
5588 | * data on failed drives. | |
5589 | */ | |
5590 | if (rw == READ && mddev->degraded == 0 && | |
7ef6b12a ML |
5591 | mddev->reshape_position == MaxSector) { |
5592 | bi = chunk_aligned_read(mddev, bi); | |
5593 | if (!bi) | |
cc27b0c7 | 5594 | return true; |
7ef6b12a | 5595 | } |
52488615 | 5596 | |
796a5cf0 | 5597 | if (unlikely(bio_op(bi) == REQ_OP_DISCARD)) { |
620125f2 | 5598 | make_discard_request(mddev, bi); |
cc27b0c7 N |
5599 | md_write_end(mddev); |
5600 | return true; | |
620125f2 SL |
5601 | } |
5602 | ||
4f024f37 | 5603 | logical_sector = bi->bi_iter.bi_sector & ~((sector_t)STRIPE_SECTORS-1); |
f73a1c7d | 5604 | last_sector = bio_end_sector(bi); |
1da177e4 | 5605 | bi->bi_next = NULL; |
06d91a5f | 5606 | |
27c0f68f | 5607 | prepare_to_wait(&conf->wait_for_overlap, &w, TASK_UNINTERRUPTIBLE); |
1da177e4 | 5608 | for (;logical_sector < last_sector; logical_sector += STRIPE_SECTORS) { |
b5663ba4 | 5609 | int previous; |
c46501b2 | 5610 | int seq; |
b578d55f | 5611 | |
27c0f68f | 5612 | do_prepare = false; |
7ecaa1e6 | 5613 | retry: |
c46501b2 | 5614 | seq = read_seqcount_begin(&conf->gen_lock); |
b5663ba4 | 5615 | previous = 0; |
27c0f68f SL |
5616 | if (do_prepare) |
5617 | prepare_to_wait(&conf->wait_for_overlap, &w, | |
5618 | TASK_UNINTERRUPTIBLE); | |
b0f9ec04 | 5619 | if (unlikely(conf->reshape_progress != MaxSector)) { |
fef9c61f | 5620 | /* spinlock is needed as reshape_progress may be |
df8e7f76 N |
5621 | * 64bit on a 32bit platform, and so it might be |
5622 | * possible to see a half-updated value | |
aeb878b0 | 5623 | * Of course reshape_progress could change after |
df8e7f76 N |
5624 | * the lock is dropped, so once we get a reference |
5625 | * to the stripe that we think it is, we will have | |
5626 | * to check again. | |
5627 | */ | |
7ecaa1e6 | 5628 | spin_lock_irq(&conf->device_lock); |
2c810cdd | 5629 | if (mddev->reshape_backwards |
fef9c61f N |
5630 | ? logical_sector < conf->reshape_progress |
5631 | : logical_sector >= conf->reshape_progress) { | |
b5663ba4 N |
5632 | previous = 1; |
5633 | } else { | |
2c810cdd | 5634 | if (mddev->reshape_backwards |
fef9c61f N |
5635 | ? logical_sector < conf->reshape_safe |
5636 | : logical_sector >= conf->reshape_safe) { | |
b578d55f N |
5637 | spin_unlock_irq(&conf->device_lock); |
5638 | schedule(); | |
27c0f68f | 5639 | do_prepare = true; |
b578d55f N |
5640 | goto retry; |
5641 | } | |
5642 | } | |
7ecaa1e6 N |
5643 | spin_unlock_irq(&conf->device_lock); |
5644 | } | |
16a53ecc | 5645 | |
112bf897 N |
5646 | new_sector = raid5_compute_sector(conf, logical_sector, |
5647 | previous, | |
911d4ee8 | 5648 | &dd_idx, NULL); |
849674e4 | 5649 | pr_debug("raid456: raid5_make_request, sector %llu logical %llu\n", |
c46501b2 | 5650 | (unsigned long long)new_sector, |
1da177e4 LT |
5651 | (unsigned long long)logical_sector); |
5652 | ||
6d036f7d | 5653 | sh = raid5_get_active_stripe(conf, new_sector, previous, |
1eff9d32 | 5654 | (bi->bi_opf & REQ_RAHEAD), 0); |
1da177e4 | 5655 | if (sh) { |
b0f9ec04 | 5656 | if (unlikely(previous)) { |
7ecaa1e6 | 5657 | /* expansion might have moved on while waiting for a |
df8e7f76 N |
5658 | * stripe, so we must do the range check again. |
5659 | * Expansion could still move past after this | |
5660 | * test, but as we are holding a reference to | |
5661 | * 'sh', we know that if that happens, | |
5662 | * STRIPE_EXPANDING will get set and the expansion | |
5663 | * won't proceed until we finish with the stripe. | |
7ecaa1e6 N |
5664 | */ |
5665 | int must_retry = 0; | |
5666 | spin_lock_irq(&conf->device_lock); | |
2c810cdd | 5667 | if (mddev->reshape_backwards |
b0f9ec04 N |
5668 | ? logical_sector >= conf->reshape_progress |
5669 | : logical_sector < conf->reshape_progress) | |
7ecaa1e6 N |
5670 | /* mismatch, need to try again */ |
5671 | must_retry = 1; | |
5672 | spin_unlock_irq(&conf->device_lock); | |
5673 | if (must_retry) { | |
6d036f7d | 5674 | raid5_release_stripe(sh); |
7a3ab908 | 5675 | schedule(); |
27c0f68f | 5676 | do_prepare = true; |
7ecaa1e6 N |
5677 | goto retry; |
5678 | } | |
5679 | } | |
c46501b2 N |
5680 | if (read_seqcount_retry(&conf->gen_lock, seq)) { |
5681 | /* Might have got the wrong stripe_head | |
5682 | * by accident | |
5683 | */ | |
6d036f7d | 5684 | raid5_release_stripe(sh); |
c46501b2 N |
5685 | goto retry; |
5686 | } | |
e62e58a5 | 5687 | |
7ecaa1e6 | 5688 | if (test_bit(STRIPE_EXPANDING, &sh->state) || |
da41ba65 | 5689 | !add_stripe_bio(sh, bi, dd_idx, rw, previous)) { |
7ecaa1e6 N |
5690 | /* Stripe is busy expanding or |
5691 | * add failed due to overlap. Flush everything | |
1da177e4 LT |
5692 | * and wait a while |
5693 | */ | |
482c0834 | 5694 | md_wakeup_thread(mddev->thread); |
6d036f7d | 5695 | raid5_release_stripe(sh); |
1da177e4 | 5696 | schedule(); |
27c0f68f | 5697 | do_prepare = true; |
1da177e4 LT |
5698 | goto retry; |
5699 | } | |
3bddb7f8 SL |
5700 | if (do_flush) { |
5701 | set_bit(STRIPE_R5C_PREFLUSH, &sh->state); | |
5702 | /* we only need flush for one stripe */ | |
5703 | do_flush = false; | |
5704 | } | |
5705 | ||
6ed3003c N |
5706 | set_bit(STRIPE_HANDLE, &sh->state); |
5707 | clear_bit(STRIPE_DELAYED, &sh->state); | |
59fc630b | 5708 | if ((!sh->batch_head || sh == sh->batch_head) && |
1eff9d32 | 5709 | (bi->bi_opf & REQ_SYNC) && |
729a1866 N |
5710 | !test_and_set_bit(STRIPE_PREREAD_ACTIVE, &sh->state)) |
5711 | atomic_inc(&conf->preread_active_stripes); | |
8811b596 | 5712 | release_stripe_plug(mddev, sh); |
1da177e4 LT |
5713 | } else { |
5714 | /* cannot get stripe for read-ahead, just give-up */ | |
4e4cbee9 | 5715 | bi->bi_status = BLK_STS_IOERR; |
1da177e4 LT |
5716 | break; |
5717 | } | |
1da177e4 | 5718 | } |
27c0f68f | 5719 | finish_wait(&conf->wait_for_overlap, &w); |
7c13edc8 | 5720 | |
49728050 N |
5721 | if (rw == WRITE) |
5722 | md_write_end(mddev); | |
016c76ac | 5723 | bio_endio(bi); |
cc27b0c7 | 5724 | return true; |
1da177e4 LT |
5725 | } |
5726 | ||
fd01b88c | 5727 | static sector_t raid5_size(struct mddev *mddev, sector_t sectors, int raid_disks); |
b522adcd | 5728 | |
fd01b88c | 5729 | static sector_t reshape_request(struct mddev *mddev, sector_t sector_nr, int *skipped) |
1da177e4 | 5730 | { |
52c03291 N |
5731 | /* reshaping is quite different to recovery/resync so it is |
5732 | * handled quite separately ... here. | |
5733 | * | |
5734 | * On each call to sync_request, we gather one chunk worth of | |
5735 | * destination stripes and flag them as expanding. | |
5736 | * Then we find all the source stripes and request reads. | |
5737 | * As the reads complete, handle_stripe will copy the data | |
5738 | * into the destination stripe and release that stripe. | |
5739 | */ | |
d1688a6d | 5740 | struct r5conf *conf = mddev->private; |
1da177e4 | 5741 | struct stripe_head *sh; |
db0505d3 | 5742 | struct md_rdev *rdev; |
ccfcc3c1 | 5743 | sector_t first_sector, last_sector; |
f416885e N |
5744 | int raid_disks = conf->previous_raid_disks; |
5745 | int data_disks = raid_disks - conf->max_degraded; | |
5746 | int new_data_disks = conf->raid_disks - conf->max_degraded; | |
52c03291 N |
5747 | int i; |
5748 | int dd_idx; | |
c8f517c4 | 5749 | sector_t writepos, readpos, safepos; |
ec32a2bd | 5750 | sector_t stripe_addr; |
7a661381 | 5751 | int reshape_sectors; |
ab69ae12 | 5752 | struct list_head stripes; |
92140480 | 5753 | sector_t retn; |
52c03291 | 5754 | |
fef9c61f N |
5755 | if (sector_nr == 0) { |
5756 | /* If restarting in the middle, skip the initial sectors */ | |
2c810cdd | 5757 | if (mddev->reshape_backwards && |
fef9c61f N |
5758 | conf->reshape_progress < raid5_size(mddev, 0, 0)) { |
5759 | sector_nr = raid5_size(mddev, 0, 0) | |
5760 | - conf->reshape_progress; | |
6cbd8148 N |
5761 | } else if (mddev->reshape_backwards && |
5762 | conf->reshape_progress == MaxSector) { | |
5763 | /* shouldn't happen, but just in case, finish up.*/ | |
5764 | sector_nr = MaxSector; | |
2c810cdd | 5765 | } else if (!mddev->reshape_backwards && |
fef9c61f N |
5766 | conf->reshape_progress > 0) |
5767 | sector_nr = conf->reshape_progress; | |
f416885e | 5768 | sector_div(sector_nr, new_data_disks); |
fef9c61f | 5769 | if (sector_nr) { |
8dee7211 N |
5770 | mddev->curr_resync_completed = sector_nr; |
5771 | sysfs_notify(&mddev->kobj, NULL, "sync_completed"); | |
fef9c61f | 5772 | *skipped = 1; |
92140480 N |
5773 | retn = sector_nr; |
5774 | goto finish; | |
fef9c61f | 5775 | } |
52c03291 N |
5776 | } |
5777 | ||
7a661381 N |
5778 | /* We need to process a full chunk at a time. |
5779 | * If old and new chunk sizes differ, we need to process the | |
5780 | * largest of these | |
5781 | */ | |
3cb5edf4 N |
5782 | |
5783 | reshape_sectors = max(conf->chunk_sectors, conf->prev_chunk_sectors); | |
7a661381 | 5784 | |
b5254dd5 N |
5785 | /* We update the metadata at least every 10 seconds, or when |
5786 | * the data about to be copied would over-write the source of | |
5787 | * the data at the front of the range. i.e. one new_stripe | |
5788 | * along from reshape_progress new_maps to after where | |
5789 | * reshape_safe old_maps to | |
52c03291 | 5790 | */ |
fef9c61f | 5791 | writepos = conf->reshape_progress; |
f416885e | 5792 | sector_div(writepos, new_data_disks); |
c8f517c4 N |
5793 | readpos = conf->reshape_progress; |
5794 | sector_div(readpos, data_disks); | |
fef9c61f | 5795 | safepos = conf->reshape_safe; |
f416885e | 5796 | sector_div(safepos, data_disks); |
2c810cdd | 5797 | if (mddev->reshape_backwards) { |
c74c0d76 N |
5798 | BUG_ON(writepos < reshape_sectors); |
5799 | writepos -= reshape_sectors; | |
c8f517c4 | 5800 | readpos += reshape_sectors; |
7a661381 | 5801 | safepos += reshape_sectors; |
fef9c61f | 5802 | } else { |
7a661381 | 5803 | writepos += reshape_sectors; |
c74c0d76 N |
5804 | /* readpos and safepos are worst-case calculations. |
5805 | * A negative number is overly pessimistic, and causes | |
5806 | * obvious problems for unsigned storage. So clip to 0. | |
5807 | */ | |
ed37d83e N |
5808 | readpos -= min_t(sector_t, reshape_sectors, readpos); |
5809 | safepos -= min_t(sector_t, reshape_sectors, safepos); | |
fef9c61f | 5810 | } |
52c03291 | 5811 | |
b5254dd5 N |
5812 | /* Having calculated the 'writepos' possibly use it |
5813 | * to set 'stripe_addr' which is where we will write to. | |
5814 | */ | |
5815 | if (mddev->reshape_backwards) { | |
5816 | BUG_ON(conf->reshape_progress == 0); | |
5817 | stripe_addr = writepos; | |
5818 | BUG_ON((mddev->dev_sectors & | |
5819 | ~((sector_t)reshape_sectors - 1)) | |
5820 | - reshape_sectors - stripe_addr | |
5821 | != sector_nr); | |
5822 | } else { | |
5823 | BUG_ON(writepos != sector_nr + reshape_sectors); | |
5824 | stripe_addr = sector_nr; | |
5825 | } | |
5826 | ||
c8f517c4 N |
5827 | /* 'writepos' is the most advanced device address we might write. |
5828 | * 'readpos' is the least advanced device address we might read. | |
5829 | * 'safepos' is the least address recorded in the metadata as having | |
5830 | * been reshaped. | |
b5254dd5 N |
5831 | * If there is a min_offset_diff, these are adjusted either by |
5832 | * increasing the safepos/readpos if diff is negative, or | |
5833 | * increasing writepos if diff is positive. | |
5834 | * If 'readpos' is then behind 'writepos', there is no way that we can | |
c8f517c4 N |
5835 | * ensure safety in the face of a crash - that must be done by userspace |
5836 | * making a backup of the data. So in that case there is no particular | |
5837 | * rush to update metadata. | |
5838 | * Otherwise if 'safepos' is behind 'writepos', then we really need to | |
5839 | * update the metadata to advance 'safepos' to match 'readpos' so that | |
5840 | * we can be safe in the event of a crash. | |
5841 | * So we insist on updating metadata if safepos is behind writepos and | |
5842 | * readpos is beyond writepos. | |
5843 | * In any case, update the metadata every 10 seconds. | |
5844 | * Maybe that number should be configurable, but I'm not sure it is | |
5845 | * worth it.... maybe it could be a multiple of safemode_delay??? | |
5846 | */ | |
b5254dd5 N |
5847 | if (conf->min_offset_diff < 0) { |
5848 | safepos += -conf->min_offset_diff; | |
5849 | readpos += -conf->min_offset_diff; | |
5850 | } else | |
5851 | writepos += conf->min_offset_diff; | |
5852 | ||
2c810cdd | 5853 | if ((mddev->reshape_backwards |
c8f517c4 N |
5854 | ? (safepos > writepos && readpos < writepos) |
5855 | : (safepos < writepos && readpos > writepos)) || | |
5856 | time_after(jiffies, conf->reshape_checkpoint + 10*HZ)) { | |
52c03291 N |
5857 | /* Cannot proceed until we've updated the superblock... */ |
5858 | wait_event(conf->wait_for_overlap, | |
c91abf5a N |
5859 | atomic_read(&conf->reshape_stripes)==0 |
5860 | || test_bit(MD_RECOVERY_INTR, &mddev->recovery)); | |
5861 | if (atomic_read(&conf->reshape_stripes) != 0) | |
5862 | return 0; | |
fef9c61f | 5863 | mddev->reshape_position = conf->reshape_progress; |
75d3da43 | 5864 | mddev->curr_resync_completed = sector_nr; |
db0505d3 N |
5865 | if (!mddev->reshape_backwards) |
5866 | /* Can update recovery_offset */ | |
5867 | rdev_for_each(rdev, mddev) | |
5868 | if (rdev->raid_disk >= 0 && | |
5869 | !test_bit(Journal, &rdev->flags) && | |
5870 | !test_bit(In_sync, &rdev->flags) && | |
5871 | rdev->recovery_offset < sector_nr) | |
5872 | rdev->recovery_offset = sector_nr; | |
5873 | ||
c8f517c4 | 5874 | conf->reshape_checkpoint = jiffies; |
2953079c | 5875 | set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags); |
52c03291 | 5876 | md_wakeup_thread(mddev->thread); |
2953079c | 5877 | wait_event(mddev->sb_wait, mddev->sb_flags == 0 || |
c91abf5a N |
5878 | test_bit(MD_RECOVERY_INTR, &mddev->recovery)); |
5879 | if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) | |
5880 | return 0; | |
52c03291 | 5881 | spin_lock_irq(&conf->device_lock); |
fef9c61f | 5882 | conf->reshape_safe = mddev->reshape_position; |
52c03291 N |
5883 | spin_unlock_irq(&conf->device_lock); |
5884 | wake_up(&conf->wait_for_overlap); | |
acb180b0 | 5885 | sysfs_notify(&mddev->kobj, NULL, "sync_completed"); |
52c03291 N |
5886 | } |
5887 | ||
ab69ae12 | 5888 | INIT_LIST_HEAD(&stripes); |
7a661381 | 5889 | for (i = 0; i < reshape_sectors; i += STRIPE_SECTORS) { |
52c03291 | 5890 | int j; |
a9f326eb | 5891 | int skipped_disk = 0; |
6d036f7d | 5892 | sh = raid5_get_active_stripe(conf, stripe_addr+i, 0, 0, 1); |
52c03291 N |
5893 | set_bit(STRIPE_EXPANDING, &sh->state); |
5894 | atomic_inc(&conf->reshape_stripes); | |
5895 | /* If any of this stripe is beyond the end of the old | |
5896 | * array, then we need to zero those blocks | |
5897 | */ | |
5898 | for (j=sh->disks; j--;) { | |
5899 | sector_t s; | |
5900 | if (j == sh->pd_idx) | |
5901 | continue; | |
f416885e | 5902 | if (conf->level == 6 && |
d0dabf7e | 5903 | j == sh->qd_idx) |
f416885e | 5904 | continue; |
6d036f7d | 5905 | s = raid5_compute_blocknr(sh, j, 0); |
b522adcd | 5906 | if (s < raid5_size(mddev, 0, 0)) { |
a9f326eb | 5907 | skipped_disk = 1; |
52c03291 N |
5908 | continue; |
5909 | } | |
5910 | memset(page_address(sh->dev[j].page), 0, STRIPE_SIZE); | |
5911 | set_bit(R5_Expanded, &sh->dev[j].flags); | |
5912 | set_bit(R5_UPTODATE, &sh->dev[j].flags); | |
5913 | } | |
a9f326eb | 5914 | if (!skipped_disk) { |
52c03291 N |
5915 | set_bit(STRIPE_EXPAND_READY, &sh->state); |
5916 | set_bit(STRIPE_HANDLE, &sh->state); | |
5917 | } | |
ab69ae12 | 5918 | list_add(&sh->lru, &stripes); |
52c03291 N |
5919 | } |
5920 | spin_lock_irq(&conf->device_lock); | |
2c810cdd | 5921 | if (mddev->reshape_backwards) |
7a661381 | 5922 | conf->reshape_progress -= reshape_sectors * new_data_disks; |
fef9c61f | 5923 | else |
7a661381 | 5924 | conf->reshape_progress += reshape_sectors * new_data_disks; |
52c03291 N |
5925 | spin_unlock_irq(&conf->device_lock); |
5926 | /* Ok, those stripe are ready. We can start scheduling | |
5927 | * reads on the source stripes. | |
5928 | * The source stripes are determined by mapping the first and last | |
5929 | * block on the destination stripes. | |
5930 | */ | |
52c03291 | 5931 | first_sector = |
ec32a2bd | 5932 | raid5_compute_sector(conf, stripe_addr*(new_data_disks), |
911d4ee8 | 5933 | 1, &dd_idx, NULL); |
52c03291 | 5934 | last_sector = |
0e6e0271 | 5935 | raid5_compute_sector(conf, ((stripe_addr+reshape_sectors) |
09c9e5fa | 5936 | * new_data_disks - 1), |
911d4ee8 | 5937 | 1, &dd_idx, NULL); |
58c0fed4 AN |
5938 | if (last_sector >= mddev->dev_sectors) |
5939 | last_sector = mddev->dev_sectors - 1; | |
52c03291 | 5940 | while (first_sector <= last_sector) { |
6d036f7d | 5941 | sh = raid5_get_active_stripe(conf, first_sector, 1, 0, 1); |
52c03291 N |
5942 | set_bit(STRIPE_EXPAND_SOURCE, &sh->state); |
5943 | set_bit(STRIPE_HANDLE, &sh->state); | |
6d036f7d | 5944 | raid5_release_stripe(sh); |
52c03291 N |
5945 | first_sector += STRIPE_SECTORS; |
5946 | } | |
ab69ae12 N |
5947 | /* Now that the sources are clearly marked, we can release |
5948 | * the destination stripes | |
5949 | */ | |
5950 | while (!list_empty(&stripes)) { | |
5951 | sh = list_entry(stripes.next, struct stripe_head, lru); | |
5952 | list_del_init(&sh->lru); | |
6d036f7d | 5953 | raid5_release_stripe(sh); |
ab69ae12 | 5954 | } |
c6207277 N |
5955 | /* If this takes us to the resync_max point where we have to pause, |
5956 | * then we need to write out the superblock. | |
5957 | */ | |
7a661381 | 5958 | sector_nr += reshape_sectors; |
92140480 N |
5959 | retn = reshape_sectors; |
5960 | finish: | |
c5e19d90 N |
5961 | if (mddev->curr_resync_completed > mddev->resync_max || |
5962 | (sector_nr - mddev->curr_resync_completed) * 2 | |
c03f6a19 | 5963 | >= mddev->resync_max - mddev->curr_resync_completed) { |
c6207277 N |
5964 | /* Cannot proceed until we've updated the superblock... */ |
5965 | wait_event(conf->wait_for_overlap, | |
c91abf5a N |
5966 | atomic_read(&conf->reshape_stripes) == 0 |
5967 | || test_bit(MD_RECOVERY_INTR, &mddev->recovery)); | |
5968 | if (atomic_read(&conf->reshape_stripes) != 0) | |
5969 | goto ret; | |
fef9c61f | 5970 | mddev->reshape_position = conf->reshape_progress; |
75d3da43 | 5971 | mddev->curr_resync_completed = sector_nr; |
db0505d3 N |
5972 | if (!mddev->reshape_backwards) |
5973 | /* Can update recovery_offset */ | |
5974 | rdev_for_each(rdev, mddev) | |
5975 | if (rdev->raid_disk >= 0 && | |
5976 | !test_bit(Journal, &rdev->flags) && | |
5977 | !test_bit(In_sync, &rdev->flags) && | |
5978 | rdev->recovery_offset < sector_nr) | |
5979 | rdev->recovery_offset = sector_nr; | |
c8f517c4 | 5980 | conf->reshape_checkpoint = jiffies; |
2953079c | 5981 | set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags); |
c6207277 N |
5982 | md_wakeup_thread(mddev->thread); |
5983 | wait_event(mddev->sb_wait, | |
2953079c | 5984 | !test_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags) |
c91abf5a N |
5985 | || test_bit(MD_RECOVERY_INTR, &mddev->recovery)); |
5986 | if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) | |
5987 | goto ret; | |
c6207277 | 5988 | spin_lock_irq(&conf->device_lock); |
fef9c61f | 5989 | conf->reshape_safe = mddev->reshape_position; |
c6207277 N |
5990 | spin_unlock_irq(&conf->device_lock); |
5991 | wake_up(&conf->wait_for_overlap); | |
acb180b0 | 5992 | sysfs_notify(&mddev->kobj, NULL, "sync_completed"); |
c6207277 | 5993 | } |
c91abf5a | 5994 | ret: |
92140480 | 5995 | return retn; |
52c03291 N |
5996 | } |
5997 | ||
849674e4 SL |
5998 | static inline sector_t raid5_sync_request(struct mddev *mddev, sector_t sector_nr, |
5999 | int *skipped) | |
52c03291 | 6000 | { |
d1688a6d | 6001 | struct r5conf *conf = mddev->private; |
52c03291 | 6002 | struct stripe_head *sh; |
58c0fed4 | 6003 | sector_t max_sector = mddev->dev_sectors; |
57dab0bd | 6004 | sector_t sync_blocks; |
16a53ecc N |
6005 | int still_degraded = 0; |
6006 | int i; | |
1da177e4 | 6007 | |
72626685 | 6008 | if (sector_nr >= max_sector) { |
1da177e4 | 6009 | /* just being told to finish up .. nothing much to do */ |
cea9c228 | 6010 | |
29269553 N |
6011 | if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)) { |
6012 | end_reshape(conf); | |
6013 | return 0; | |
6014 | } | |
72626685 N |
6015 | |
6016 | if (mddev->curr_resync < max_sector) /* aborted */ | |
6017 | bitmap_end_sync(mddev->bitmap, mddev->curr_resync, | |
6018 | &sync_blocks, 1); | |
16a53ecc | 6019 | else /* completed sync */ |
72626685 N |
6020 | conf->fullsync = 0; |
6021 | bitmap_close_sync(mddev->bitmap); | |
6022 | ||
1da177e4 LT |
6023 | return 0; |
6024 | } | |
ccfcc3c1 | 6025 | |
64bd660b N |
6026 | /* Allow raid5_quiesce to complete */ |
6027 | wait_event(conf->wait_for_overlap, conf->quiesce != 2); | |
6028 | ||
52c03291 N |
6029 | if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)) |
6030 | return reshape_request(mddev, sector_nr, skipped); | |
f6705578 | 6031 | |
c6207277 N |
6032 | /* No need to check resync_max as we never do more than one |
6033 | * stripe, and as resync_max will always be on a chunk boundary, | |
6034 | * if the check in md_do_sync didn't fire, there is no chance | |
6035 | * of overstepping resync_max here | |
6036 | */ | |
6037 | ||
16a53ecc | 6038 | /* if there is too many failed drives and we are trying |
1da177e4 LT |
6039 | * to resync, then assert that we are finished, because there is |
6040 | * nothing we can do. | |
6041 | */ | |
3285edf1 | 6042 | if (mddev->degraded >= conf->max_degraded && |
16a53ecc | 6043 | test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) { |
58c0fed4 | 6044 | sector_t rv = mddev->dev_sectors - sector_nr; |
57afd89f | 6045 | *skipped = 1; |
1da177e4 LT |
6046 | return rv; |
6047 | } | |
6f608040 | 6048 | if (!test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery) && |
6049 | !conf->fullsync && | |
6050 | !bitmap_start_sync(mddev->bitmap, sector_nr, &sync_blocks, 1) && | |
6051 | sync_blocks >= STRIPE_SECTORS) { | |
72626685 N |
6052 | /* we can skip this block, and probably more */ |
6053 | sync_blocks /= STRIPE_SECTORS; | |
6054 | *skipped = 1; | |
6055 | return sync_blocks * STRIPE_SECTORS; /* keep things rounded to whole stripes */ | |
6056 | } | |
1da177e4 | 6057 | |
c40f341f | 6058 | bitmap_cond_end_sync(mddev->bitmap, sector_nr, false); |
b47490c9 | 6059 | |
6d036f7d | 6060 | sh = raid5_get_active_stripe(conf, sector_nr, 0, 1, 0); |
1da177e4 | 6061 | if (sh == NULL) { |
6d036f7d | 6062 | sh = raid5_get_active_stripe(conf, sector_nr, 0, 0, 0); |
1da177e4 | 6063 | /* make sure we don't swamp the stripe cache if someone else |
16a53ecc | 6064 | * is trying to get access |
1da177e4 | 6065 | */ |
66c006a5 | 6066 | schedule_timeout_uninterruptible(1); |
1da177e4 | 6067 | } |
16a53ecc | 6068 | /* Need to check if array will still be degraded after recovery/resync |
16d9cfab EM |
6069 | * Note in case of > 1 drive failures it's possible we're rebuilding |
6070 | * one drive while leaving another faulty drive in array. | |
16a53ecc | 6071 | */ |
16d9cfab EM |
6072 | rcu_read_lock(); |
6073 | for (i = 0; i < conf->raid_disks; i++) { | |
6aa7de05 | 6074 | struct md_rdev *rdev = READ_ONCE(conf->disks[i].rdev); |
16d9cfab EM |
6075 | |
6076 | if (rdev == NULL || test_bit(Faulty, &rdev->flags)) | |
16a53ecc | 6077 | still_degraded = 1; |
16d9cfab EM |
6078 | } |
6079 | rcu_read_unlock(); | |
16a53ecc N |
6080 | |
6081 | bitmap_start_sync(mddev->bitmap, sector_nr, &sync_blocks, still_degraded); | |
6082 | ||
83206d66 | 6083 | set_bit(STRIPE_SYNC_REQUESTED, &sh->state); |
053f5b65 | 6084 | set_bit(STRIPE_HANDLE, &sh->state); |
1da177e4 | 6085 | |
6d036f7d | 6086 | raid5_release_stripe(sh); |
1da177e4 LT |
6087 | |
6088 | return STRIPE_SECTORS; | |
6089 | } | |
6090 | ||
0472a42b N |
6091 | static int retry_aligned_read(struct r5conf *conf, struct bio *raid_bio, |
6092 | unsigned int offset) | |
46031f9a RBJ |
6093 | { |
6094 | /* We may not be able to submit a whole bio at once as there | |
6095 | * may not be enough stripe_heads available. | |
6096 | * We cannot pre-allocate enough stripe_heads as we may need | |
6097 | * more than exist in the cache (if we allow ever large chunks). | |
6098 | * So we do one stripe head at a time and record in | |
6099 | * ->bi_hw_segments how many have been done. | |
6100 | * | |
6101 | * We *know* that this entire raid_bio is in one chunk, so | |
6102 | * it will be only one 'dd_idx' and only need one call to raid5_compute_sector. | |
6103 | */ | |
6104 | struct stripe_head *sh; | |
911d4ee8 | 6105 | int dd_idx; |
46031f9a RBJ |
6106 | sector_t sector, logical_sector, last_sector; |
6107 | int scnt = 0; | |
46031f9a RBJ |
6108 | int handled = 0; |
6109 | ||
4f024f37 KO |
6110 | logical_sector = raid_bio->bi_iter.bi_sector & |
6111 | ~((sector_t)STRIPE_SECTORS-1); | |
112bf897 | 6112 | sector = raid5_compute_sector(conf, logical_sector, |
911d4ee8 | 6113 | 0, &dd_idx, NULL); |
f73a1c7d | 6114 | last_sector = bio_end_sector(raid_bio); |
46031f9a RBJ |
6115 | |
6116 | for (; logical_sector < last_sector; | |
387bb173 NB |
6117 | logical_sector += STRIPE_SECTORS, |
6118 | sector += STRIPE_SECTORS, | |
6119 | scnt++) { | |
46031f9a | 6120 | |
0472a42b | 6121 | if (scnt < offset) |
46031f9a RBJ |
6122 | /* already done this stripe */ |
6123 | continue; | |
6124 | ||
6d036f7d | 6125 | sh = raid5_get_active_stripe(conf, sector, 0, 1, 1); |
46031f9a RBJ |
6126 | |
6127 | if (!sh) { | |
6128 | /* failed to get a stripe - must wait */ | |
46031f9a | 6129 | conf->retry_read_aligned = raid_bio; |
0472a42b | 6130 | conf->retry_read_offset = scnt; |
46031f9a RBJ |
6131 | return handled; |
6132 | } | |
6133 | ||
da41ba65 | 6134 | if (!add_stripe_bio(sh, raid_bio, dd_idx, 0, 0)) { |
6d036f7d | 6135 | raid5_release_stripe(sh); |
387bb173 | 6136 | conf->retry_read_aligned = raid_bio; |
0472a42b | 6137 | conf->retry_read_offset = scnt; |
387bb173 NB |
6138 | return handled; |
6139 | } | |
6140 | ||
3f9e7c14 | 6141 | set_bit(R5_ReadNoMerge, &sh->dev[dd_idx].flags); |
36d1c647 | 6142 | handle_stripe(sh); |
6d036f7d | 6143 | raid5_release_stripe(sh); |
46031f9a RBJ |
6144 | handled++; |
6145 | } | |
016c76ac N |
6146 | |
6147 | bio_endio(raid_bio); | |
6148 | ||
46031f9a | 6149 | if (atomic_dec_and_test(&conf->active_aligned_reads)) |
b1b46486 | 6150 | wake_up(&conf->wait_for_quiescent); |
46031f9a RBJ |
6151 | return handled; |
6152 | } | |
6153 | ||
bfc90cb0 | 6154 | static int handle_active_stripes(struct r5conf *conf, int group, |
566c09c5 SL |
6155 | struct r5worker *worker, |
6156 | struct list_head *temp_inactive_list) | |
46a06401 SL |
6157 | { |
6158 | struct stripe_head *batch[MAX_STRIPE_BATCH], *sh; | |
566c09c5 SL |
6159 | int i, batch_size = 0, hash; |
6160 | bool release_inactive = false; | |
46a06401 SL |
6161 | |
6162 | while (batch_size < MAX_STRIPE_BATCH && | |
851c30c9 | 6163 | (sh = __get_priority_stripe(conf, group)) != NULL) |
46a06401 SL |
6164 | batch[batch_size++] = sh; |
6165 | ||
566c09c5 SL |
6166 | if (batch_size == 0) { |
6167 | for (i = 0; i < NR_STRIPE_HASH_LOCKS; i++) | |
6168 | if (!list_empty(temp_inactive_list + i)) | |
6169 | break; | |
a8c34f91 SL |
6170 | if (i == NR_STRIPE_HASH_LOCKS) { |
6171 | spin_unlock_irq(&conf->device_lock); | |
1532d9e8 | 6172 | log_flush_stripe_to_raid(conf); |
a8c34f91 | 6173 | spin_lock_irq(&conf->device_lock); |
566c09c5 | 6174 | return batch_size; |
a8c34f91 | 6175 | } |
566c09c5 SL |
6176 | release_inactive = true; |
6177 | } | |
46a06401 SL |
6178 | spin_unlock_irq(&conf->device_lock); |
6179 | ||
566c09c5 SL |
6180 | release_inactive_stripe_list(conf, temp_inactive_list, |
6181 | NR_STRIPE_HASH_LOCKS); | |
6182 | ||
a8c34f91 | 6183 | r5l_flush_stripe_to_raid(conf->log); |
566c09c5 SL |
6184 | if (release_inactive) { |
6185 | spin_lock_irq(&conf->device_lock); | |
6186 | return 0; | |
6187 | } | |
6188 | ||
46a06401 SL |
6189 | for (i = 0; i < batch_size; i++) |
6190 | handle_stripe(batch[i]); | |
ff875738 | 6191 | log_write_stripe_run(conf); |
46a06401 SL |
6192 | |
6193 | cond_resched(); | |
6194 | ||
6195 | spin_lock_irq(&conf->device_lock); | |
566c09c5 SL |
6196 | for (i = 0; i < batch_size; i++) { |
6197 | hash = batch[i]->hash_lock_index; | |
6198 | __release_stripe(conf, batch[i], &temp_inactive_list[hash]); | |
6199 | } | |
46a06401 SL |
6200 | return batch_size; |
6201 | } | |
46031f9a | 6202 | |
851c30c9 SL |
6203 | static void raid5_do_work(struct work_struct *work) |
6204 | { | |
6205 | struct r5worker *worker = container_of(work, struct r5worker, work); | |
6206 | struct r5worker_group *group = worker->group; | |
6207 | struct r5conf *conf = group->conf; | |
16d997b7 | 6208 | struct mddev *mddev = conf->mddev; |
851c30c9 SL |
6209 | int group_id = group - conf->worker_groups; |
6210 | int handled; | |
6211 | struct blk_plug plug; | |
6212 | ||
6213 | pr_debug("+++ raid5worker active\n"); | |
6214 | ||
6215 | blk_start_plug(&plug); | |
6216 | handled = 0; | |
6217 | spin_lock_irq(&conf->device_lock); | |
6218 | while (1) { | |
6219 | int batch_size, released; | |
6220 | ||
566c09c5 | 6221 | released = release_stripe_list(conf, worker->temp_inactive_list); |
851c30c9 | 6222 | |
566c09c5 SL |
6223 | batch_size = handle_active_stripes(conf, group_id, worker, |
6224 | worker->temp_inactive_list); | |
bfc90cb0 | 6225 | worker->working = false; |
851c30c9 SL |
6226 | if (!batch_size && !released) |
6227 | break; | |
6228 | handled += batch_size; | |
16d997b7 N |
6229 | wait_event_lock_irq(mddev->sb_wait, |
6230 | !test_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags), | |
6231 | conf->device_lock); | |
851c30c9 SL |
6232 | } |
6233 | pr_debug("%d stripes handled\n", handled); | |
6234 | ||
6235 | spin_unlock_irq(&conf->device_lock); | |
7e96d559 | 6236 | |
9c72a18e SL |
6237 | flush_deferred_bios(conf); |
6238 | ||
6239 | r5l_flush_stripe_to_raid(conf->log); | |
6240 | ||
7e96d559 | 6241 | async_tx_issue_pending_all(); |
851c30c9 SL |
6242 | blk_finish_plug(&plug); |
6243 | ||
6244 | pr_debug("--- raid5worker inactive\n"); | |
6245 | } | |
6246 | ||
1da177e4 LT |
6247 | /* |
6248 | * This is our raid5 kernel thread. | |
6249 | * | |
6250 | * We scan the hash table for stripes which can be handled now. | |
6251 | * During the scan, completed stripes are saved for us by the interrupt | |
6252 | * handler, so that they will not have to wait for our next wakeup. | |
6253 | */ | |
4ed8731d | 6254 | static void raid5d(struct md_thread *thread) |
1da177e4 | 6255 | { |
4ed8731d | 6256 | struct mddev *mddev = thread->mddev; |
d1688a6d | 6257 | struct r5conf *conf = mddev->private; |
1da177e4 | 6258 | int handled; |
e1dfa0a2 | 6259 | struct blk_plug plug; |
1da177e4 | 6260 | |
45b4233c | 6261 | pr_debug("+++ raid5d active\n"); |
1da177e4 LT |
6262 | |
6263 | md_check_recovery(mddev); | |
1da177e4 | 6264 | |
e1dfa0a2 | 6265 | blk_start_plug(&plug); |
1da177e4 LT |
6266 | handled = 0; |
6267 | spin_lock_irq(&conf->device_lock); | |
6268 | while (1) { | |
46031f9a | 6269 | struct bio *bio; |
773ca82f | 6270 | int batch_size, released; |
0472a42b | 6271 | unsigned int offset; |
773ca82f | 6272 | |
566c09c5 | 6273 | released = release_stripe_list(conf, conf->temp_inactive_list); |
edbe83ab N |
6274 | if (released) |
6275 | clear_bit(R5_DID_ALLOC, &conf->cache_state); | |
1da177e4 | 6276 | |
0021b7bc | 6277 | if ( |
7c13edc8 N |
6278 | !list_empty(&conf->bitmap_list)) { |
6279 | /* Now is a good time to flush some bitmap updates */ | |
6280 | conf->seq_flush++; | |
700e432d | 6281 | spin_unlock_irq(&conf->device_lock); |
72626685 | 6282 | bitmap_unplug(mddev->bitmap); |
700e432d | 6283 | spin_lock_irq(&conf->device_lock); |
7c13edc8 | 6284 | conf->seq_write = conf->seq_flush; |
566c09c5 | 6285 | activate_bit_delay(conf, conf->temp_inactive_list); |
72626685 | 6286 | } |
0021b7bc | 6287 | raid5_activate_delayed(conf); |
72626685 | 6288 | |
0472a42b | 6289 | while ((bio = remove_bio_from_retry(conf, &offset))) { |
46031f9a RBJ |
6290 | int ok; |
6291 | spin_unlock_irq(&conf->device_lock); | |
0472a42b | 6292 | ok = retry_aligned_read(conf, bio, offset); |
46031f9a RBJ |
6293 | spin_lock_irq(&conf->device_lock); |
6294 | if (!ok) | |
6295 | break; | |
6296 | handled++; | |
6297 | } | |
6298 | ||
566c09c5 SL |
6299 | batch_size = handle_active_stripes(conf, ANY_GROUP, NULL, |
6300 | conf->temp_inactive_list); | |
773ca82f | 6301 | if (!batch_size && !released) |
1da177e4 | 6302 | break; |
46a06401 | 6303 | handled += batch_size; |
1da177e4 | 6304 | |
2953079c | 6305 | if (mddev->sb_flags & ~(1 << MD_SB_CHANGE_PENDING)) { |
46a06401 | 6306 | spin_unlock_irq(&conf->device_lock); |
de393cde | 6307 | md_check_recovery(mddev); |
46a06401 SL |
6308 | spin_lock_irq(&conf->device_lock); |
6309 | } | |
1da177e4 | 6310 | } |
45b4233c | 6311 | pr_debug("%d stripes handled\n", handled); |
1da177e4 LT |
6312 | |
6313 | spin_unlock_irq(&conf->device_lock); | |
2d5b569b N |
6314 | if (test_and_clear_bit(R5_ALLOC_MORE, &conf->cache_state) && |
6315 | mutex_trylock(&conf->cache_size_mutex)) { | |
edbe83ab N |
6316 | grow_one_stripe(conf, __GFP_NOWARN); |
6317 | /* Set flag even if allocation failed. This helps | |
6318 | * slow down allocation requests when mem is short | |
6319 | */ | |
6320 | set_bit(R5_DID_ALLOC, &conf->cache_state); | |
2d5b569b | 6321 | mutex_unlock(&conf->cache_size_mutex); |
edbe83ab | 6322 | } |
1da177e4 | 6323 | |
765d704d SL |
6324 | flush_deferred_bios(conf); |
6325 | ||
0576b1c6 SL |
6326 | r5l_flush_stripe_to_raid(conf->log); |
6327 | ||
c9f21aaf | 6328 | async_tx_issue_pending_all(); |
e1dfa0a2 | 6329 | blk_finish_plug(&plug); |
1da177e4 | 6330 | |
45b4233c | 6331 | pr_debug("--- raid5d inactive\n"); |
1da177e4 LT |
6332 | } |
6333 | ||
3f294f4f | 6334 | static ssize_t |
fd01b88c | 6335 | raid5_show_stripe_cache_size(struct mddev *mddev, char *page) |
3f294f4f | 6336 | { |
7b1485ba N |
6337 | struct r5conf *conf; |
6338 | int ret = 0; | |
6339 | spin_lock(&mddev->lock); | |
6340 | conf = mddev->private; | |
96de1e66 | 6341 | if (conf) |
edbe83ab | 6342 | ret = sprintf(page, "%d\n", conf->min_nr_stripes); |
7b1485ba N |
6343 | spin_unlock(&mddev->lock); |
6344 | return ret; | |
3f294f4f N |
6345 | } |
6346 | ||
c41d4ac4 | 6347 | int |
fd01b88c | 6348 | raid5_set_cache_size(struct mddev *mddev, int size) |
3f294f4f | 6349 | { |
d1688a6d | 6350 | struct r5conf *conf = mddev->private; |
b5470dc5 | 6351 | |
c41d4ac4 | 6352 | if (size <= 16 || size > 32768) |
3f294f4f | 6353 | return -EINVAL; |
486f0644 | 6354 | |
edbe83ab | 6355 | conf->min_nr_stripes = size; |
2d5b569b | 6356 | mutex_lock(&conf->cache_size_mutex); |
486f0644 N |
6357 | while (size < conf->max_nr_stripes && |
6358 | drop_one_stripe(conf)) | |
6359 | ; | |
2d5b569b | 6360 | mutex_unlock(&conf->cache_size_mutex); |
486f0644 | 6361 | |
2214c260 | 6362 | md_allow_write(mddev); |
486f0644 | 6363 | |
2d5b569b | 6364 | mutex_lock(&conf->cache_size_mutex); |
486f0644 N |
6365 | while (size > conf->max_nr_stripes) |
6366 | if (!grow_one_stripe(conf, GFP_KERNEL)) | |
6367 | break; | |
2d5b569b | 6368 | mutex_unlock(&conf->cache_size_mutex); |
486f0644 | 6369 | |
c41d4ac4 N |
6370 | return 0; |
6371 | } | |
6372 | EXPORT_SYMBOL(raid5_set_cache_size); | |
6373 | ||
6374 | static ssize_t | |
fd01b88c | 6375 | raid5_store_stripe_cache_size(struct mddev *mddev, const char *page, size_t len) |
c41d4ac4 | 6376 | { |
6791875e | 6377 | struct r5conf *conf; |
c41d4ac4 N |
6378 | unsigned long new; |
6379 | int err; | |
6380 | ||
6381 | if (len >= PAGE_SIZE) | |
6382 | return -EINVAL; | |
b29bebd6 | 6383 | if (kstrtoul(page, 10, &new)) |
c41d4ac4 | 6384 | return -EINVAL; |
6791875e | 6385 | err = mddev_lock(mddev); |
c41d4ac4 N |
6386 | if (err) |
6387 | return err; | |
6791875e N |
6388 | conf = mddev->private; |
6389 | if (!conf) | |
6390 | err = -ENODEV; | |
6391 | else | |
6392 | err = raid5_set_cache_size(mddev, new); | |
6393 | mddev_unlock(mddev); | |
6394 | ||
6395 | return err ?: len; | |
3f294f4f | 6396 | } |
007583c9 | 6397 | |
96de1e66 N |
6398 | static struct md_sysfs_entry |
6399 | raid5_stripecache_size = __ATTR(stripe_cache_size, S_IRUGO | S_IWUSR, | |
6400 | raid5_show_stripe_cache_size, | |
6401 | raid5_store_stripe_cache_size); | |
3f294f4f | 6402 | |
d06f191f MS |
6403 | static ssize_t |
6404 | raid5_show_rmw_level(struct mddev *mddev, char *page) | |
6405 | { | |
6406 | struct r5conf *conf = mddev->private; | |
6407 | if (conf) | |
6408 | return sprintf(page, "%d\n", conf->rmw_level); | |
6409 | else | |
6410 | return 0; | |
6411 | } | |
6412 | ||
6413 | static ssize_t | |
6414 | raid5_store_rmw_level(struct mddev *mddev, const char *page, size_t len) | |
6415 | { | |
6416 | struct r5conf *conf = mddev->private; | |
6417 | unsigned long new; | |
6418 | ||
6419 | if (!conf) | |
6420 | return -ENODEV; | |
6421 | ||
6422 | if (len >= PAGE_SIZE) | |
6423 | return -EINVAL; | |
6424 | ||
6425 | if (kstrtoul(page, 10, &new)) | |
6426 | return -EINVAL; | |
6427 | ||
6428 | if (new != PARITY_DISABLE_RMW && !raid6_call.xor_syndrome) | |
6429 | return -EINVAL; | |
6430 | ||
6431 | if (new != PARITY_DISABLE_RMW && | |
6432 | new != PARITY_ENABLE_RMW && | |
6433 | new != PARITY_PREFER_RMW) | |
6434 | return -EINVAL; | |
6435 | ||
6436 | conf->rmw_level = new; | |
6437 | return len; | |
6438 | } | |
6439 | ||
6440 | static struct md_sysfs_entry | |
6441 | raid5_rmw_level = __ATTR(rmw_level, S_IRUGO | S_IWUSR, | |
6442 | raid5_show_rmw_level, | |
6443 | raid5_store_rmw_level); | |
6444 | ||
6445 | ||
8b3e6cdc | 6446 | static ssize_t |
fd01b88c | 6447 | raid5_show_preread_threshold(struct mddev *mddev, char *page) |
8b3e6cdc | 6448 | { |
7b1485ba N |
6449 | struct r5conf *conf; |
6450 | int ret = 0; | |
6451 | spin_lock(&mddev->lock); | |
6452 | conf = mddev->private; | |
8b3e6cdc | 6453 | if (conf) |
7b1485ba N |
6454 | ret = sprintf(page, "%d\n", conf->bypass_threshold); |
6455 | spin_unlock(&mddev->lock); | |
6456 | return ret; | |
8b3e6cdc DW |
6457 | } |
6458 | ||
6459 | static ssize_t | |
fd01b88c | 6460 | raid5_store_preread_threshold(struct mddev *mddev, const char *page, size_t len) |
8b3e6cdc | 6461 | { |
6791875e | 6462 | struct r5conf *conf; |
4ef197d8 | 6463 | unsigned long new; |
6791875e N |
6464 | int err; |
6465 | ||
8b3e6cdc DW |
6466 | if (len >= PAGE_SIZE) |
6467 | return -EINVAL; | |
b29bebd6 | 6468 | if (kstrtoul(page, 10, &new)) |
8b3e6cdc | 6469 | return -EINVAL; |
6791875e N |
6470 | |
6471 | err = mddev_lock(mddev); | |
6472 | if (err) | |
6473 | return err; | |
6474 | conf = mddev->private; | |
6475 | if (!conf) | |
6476 | err = -ENODEV; | |
edbe83ab | 6477 | else if (new > conf->min_nr_stripes) |
6791875e N |
6478 | err = -EINVAL; |
6479 | else | |
6480 | conf->bypass_threshold = new; | |
6481 | mddev_unlock(mddev); | |
6482 | return err ?: len; | |
8b3e6cdc DW |
6483 | } |
6484 | ||
6485 | static struct md_sysfs_entry | |
6486 | raid5_preread_bypass_threshold = __ATTR(preread_bypass_threshold, | |
6487 | S_IRUGO | S_IWUSR, | |
6488 | raid5_show_preread_threshold, | |
6489 | raid5_store_preread_threshold); | |
6490 | ||
d592a996 SL |
6491 | static ssize_t |
6492 | raid5_show_skip_copy(struct mddev *mddev, char *page) | |
6493 | { | |
7b1485ba N |
6494 | struct r5conf *conf; |
6495 | int ret = 0; | |
6496 | spin_lock(&mddev->lock); | |
6497 | conf = mddev->private; | |
d592a996 | 6498 | if (conf) |
7b1485ba N |
6499 | ret = sprintf(page, "%d\n", conf->skip_copy); |
6500 | spin_unlock(&mddev->lock); | |
6501 | return ret; | |
d592a996 SL |
6502 | } |
6503 | ||
6504 | static ssize_t | |
6505 | raid5_store_skip_copy(struct mddev *mddev, const char *page, size_t len) | |
6506 | { | |
6791875e | 6507 | struct r5conf *conf; |
d592a996 | 6508 | unsigned long new; |
6791875e N |
6509 | int err; |
6510 | ||
d592a996 SL |
6511 | if (len >= PAGE_SIZE) |
6512 | return -EINVAL; | |
d592a996 SL |
6513 | if (kstrtoul(page, 10, &new)) |
6514 | return -EINVAL; | |
6515 | new = !!new; | |
6791875e N |
6516 | |
6517 | err = mddev_lock(mddev); | |
6518 | if (err) | |
6519 | return err; | |
6520 | conf = mddev->private; | |
6521 | if (!conf) | |
6522 | err = -ENODEV; | |
6523 | else if (new != conf->skip_copy) { | |
6524 | mddev_suspend(mddev); | |
6525 | conf->skip_copy = new; | |
6526 | if (new) | |
dc3b17cc | 6527 | mddev->queue->backing_dev_info->capabilities |= |
6791875e N |
6528 | BDI_CAP_STABLE_WRITES; |
6529 | else | |
dc3b17cc | 6530 | mddev->queue->backing_dev_info->capabilities &= |
6791875e N |
6531 | ~BDI_CAP_STABLE_WRITES; |
6532 | mddev_resume(mddev); | |
6533 | } | |
6534 | mddev_unlock(mddev); | |
6535 | return err ?: len; | |
d592a996 SL |
6536 | } |
6537 | ||
6538 | static struct md_sysfs_entry | |
6539 | raid5_skip_copy = __ATTR(skip_copy, S_IRUGO | S_IWUSR, | |
6540 | raid5_show_skip_copy, | |
6541 | raid5_store_skip_copy); | |
6542 | ||
3f294f4f | 6543 | static ssize_t |
fd01b88c | 6544 | stripe_cache_active_show(struct mddev *mddev, char *page) |
3f294f4f | 6545 | { |
d1688a6d | 6546 | struct r5conf *conf = mddev->private; |
96de1e66 N |
6547 | if (conf) |
6548 | return sprintf(page, "%d\n", atomic_read(&conf->active_stripes)); | |
6549 | else | |
6550 | return 0; | |
3f294f4f N |
6551 | } |
6552 | ||
96de1e66 N |
6553 | static struct md_sysfs_entry |
6554 | raid5_stripecache_active = __ATTR_RO(stripe_cache_active); | |
3f294f4f | 6555 | |
b721420e SL |
6556 | static ssize_t |
6557 | raid5_show_group_thread_cnt(struct mddev *mddev, char *page) | |
6558 | { | |
7b1485ba N |
6559 | struct r5conf *conf; |
6560 | int ret = 0; | |
6561 | spin_lock(&mddev->lock); | |
6562 | conf = mddev->private; | |
b721420e | 6563 | if (conf) |
7b1485ba N |
6564 | ret = sprintf(page, "%d\n", conf->worker_cnt_per_group); |
6565 | spin_unlock(&mddev->lock); | |
6566 | return ret; | |
b721420e SL |
6567 | } |
6568 | ||
60aaf933 | 6569 | static int alloc_thread_groups(struct r5conf *conf, int cnt, |
6570 | int *group_cnt, | |
6571 | int *worker_cnt_per_group, | |
6572 | struct r5worker_group **worker_groups); | |
b721420e SL |
6573 | static ssize_t |
6574 | raid5_store_group_thread_cnt(struct mddev *mddev, const char *page, size_t len) | |
6575 | { | |
6791875e | 6576 | struct r5conf *conf; |
7d5d7b50 | 6577 | unsigned int new; |
b721420e | 6578 | int err; |
60aaf933 | 6579 | struct r5worker_group *new_groups, *old_groups; |
6580 | int group_cnt, worker_cnt_per_group; | |
b721420e SL |
6581 | |
6582 | if (len >= PAGE_SIZE) | |
6583 | return -EINVAL; | |
7d5d7b50 SL |
6584 | if (kstrtouint(page, 10, &new)) |
6585 | return -EINVAL; | |
6586 | /* 8192 should be big enough */ | |
6587 | if (new > 8192) | |
b721420e SL |
6588 | return -EINVAL; |
6589 | ||
6791875e N |
6590 | err = mddev_lock(mddev); |
6591 | if (err) | |
6592 | return err; | |
6593 | conf = mddev->private; | |
6594 | if (!conf) | |
6595 | err = -ENODEV; | |
6596 | else if (new != conf->worker_cnt_per_group) { | |
6597 | mddev_suspend(mddev); | |
b721420e | 6598 | |
6791875e N |
6599 | old_groups = conf->worker_groups; |
6600 | if (old_groups) | |
6601 | flush_workqueue(raid5_wq); | |
d206dcfa | 6602 | |
6791875e N |
6603 | err = alloc_thread_groups(conf, new, |
6604 | &group_cnt, &worker_cnt_per_group, | |
6605 | &new_groups); | |
6606 | if (!err) { | |
6607 | spin_lock_irq(&conf->device_lock); | |
6608 | conf->group_cnt = group_cnt; | |
6609 | conf->worker_cnt_per_group = worker_cnt_per_group; | |
6610 | conf->worker_groups = new_groups; | |
6611 | spin_unlock_irq(&conf->device_lock); | |
b721420e | 6612 | |
6791875e N |
6613 | if (old_groups) |
6614 | kfree(old_groups[0].workers); | |
6615 | kfree(old_groups); | |
6616 | } | |
6617 | mddev_resume(mddev); | |
b721420e | 6618 | } |
6791875e | 6619 | mddev_unlock(mddev); |
b721420e | 6620 | |
6791875e | 6621 | return err ?: len; |
b721420e SL |
6622 | } |
6623 | ||
6624 | static struct md_sysfs_entry | |
6625 | raid5_group_thread_cnt = __ATTR(group_thread_cnt, S_IRUGO | S_IWUSR, | |
6626 | raid5_show_group_thread_cnt, | |
6627 | raid5_store_group_thread_cnt); | |
6628 | ||
007583c9 | 6629 | static struct attribute *raid5_attrs[] = { |
3f294f4f N |
6630 | &raid5_stripecache_size.attr, |
6631 | &raid5_stripecache_active.attr, | |
8b3e6cdc | 6632 | &raid5_preread_bypass_threshold.attr, |
b721420e | 6633 | &raid5_group_thread_cnt.attr, |
d592a996 | 6634 | &raid5_skip_copy.attr, |
d06f191f | 6635 | &raid5_rmw_level.attr, |
2c7da14b | 6636 | &r5c_journal_mode.attr, |
3f294f4f N |
6637 | NULL, |
6638 | }; | |
007583c9 N |
6639 | static struct attribute_group raid5_attrs_group = { |
6640 | .name = NULL, | |
6641 | .attrs = raid5_attrs, | |
3f294f4f N |
6642 | }; |
6643 | ||
60aaf933 | 6644 | static int alloc_thread_groups(struct r5conf *conf, int cnt, |
6645 | int *group_cnt, | |
6646 | int *worker_cnt_per_group, | |
6647 | struct r5worker_group **worker_groups) | |
851c30c9 | 6648 | { |
566c09c5 | 6649 | int i, j, k; |
851c30c9 SL |
6650 | ssize_t size; |
6651 | struct r5worker *workers; | |
6652 | ||
60aaf933 | 6653 | *worker_cnt_per_group = cnt; |
851c30c9 | 6654 | if (cnt == 0) { |
60aaf933 | 6655 | *group_cnt = 0; |
6656 | *worker_groups = NULL; | |
851c30c9 SL |
6657 | return 0; |
6658 | } | |
60aaf933 | 6659 | *group_cnt = num_possible_nodes(); |
851c30c9 | 6660 | size = sizeof(struct r5worker) * cnt; |
60aaf933 | 6661 | workers = kzalloc(size * *group_cnt, GFP_NOIO); |
6662 | *worker_groups = kzalloc(sizeof(struct r5worker_group) * | |
6663 | *group_cnt, GFP_NOIO); | |
6664 | if (!*worker_groups || !workers) { | |
851c30c9 | 6665 | kfree(workers); |
60aaf933 | 6666 | kfree(*worker_groups); |
851c30c9 SL |
6667 | return -ENOMEM; |
6668 | } | |
6669 | ||
60aaf933 | 6670 | for (i = 0; i < *group_cnt; i++) { |
851c30c9 SL |
6671 | struct r5worker_group *group; |
6672 | ||
0c775d52 | 6673 | group = &(*worker_groups)[i]; |
851c30c9 | 6674 | INIT_LIST_HEAD(&group->handle_list); |
535ae4eb | 6675 | INIT_LIST_HEAD(&group->loprio_list); |
851c30c9 SL |
6676 | group->conf = conf; |
6677 | group->workers = workers + i * cnt; | |
6678 | ||
6679 | for (j = 0; j < cnt; j++) { | |
566c09c5 SL |
6680 | struct r5worker *worker = group->workers + j; |
6681 | worker->group = group; | |
6682 | INIT_WORK(&worker->work, raid5_do_work); | |
6683 | ||
6684 | for (k = 0; k < NR_STRIPE_HASH_LOCKS; k++) | |
6685 | INIT_LIST_HEAD(worker->temp_inactive_list + k); | |
851c30c9 SL |
6686 | } |
6687 | } | |
6688 | ||
6689 | return 0; | |
6690 | } | |
6691 | ||
6692 | static void free_thread_groups(struct r5conf *conf) | |
6693 | { | |
6694 | if (conf->worker_groups) | |
6695 | kfree(conf->worker_groups[0].workers); | |
6696 | kfree(conf->worker_groups); | |
6697 | conf->worker_groups = NULL; | |
6698 | } | |
6699 | ||
80c3a6ce | 6700 | static sector_t |
fd01b88c | 6701 | raid5_size(struct mddev *mddev, sector_t sectors, int raid_disks) |
80c3a6ce | 6702 | { |
d1688a6d | 6703 | struct r5conf *conf = mddev->private; |
80c3a6ce DW |
6704 | |
6705 | if (!sectors) | |
6706 | sectors = mddev->dev_sectors; | |
5e5e3e78 | 6707 | if (!raid_disks) |
7ec05478 | 6708 | /* size is defined by the smallest of previous and new size */ |
5e5e3e78 | 6709 | raid_disks = min(conf->raid_disks, conf->previous_raid_disks); |
80c3a6ce | 6710 | |
3cb5edf4 N |
6711 | sectors &= ~((sector_t)conf->chunk_sectors - 1); |
6712 | sectors &= ~((sector_t)conf->prev_chunk_sectors - 1); | |
80c3a6ce DW |
6713 | return sectors * (raid_disks - conf->max_degraded); |
6714 | } | |
6715 | ||
789b5e03 ON |
6716 | static void free_scratch_buffer(struct r5conf *conf, struct raid5_percpu *percpu) |
6717 | { | |
6718 | safe_put_page(percpu->spare_page); | |
46d5b785 | 6719 | if (percpu->scribble) |
6720 | flex_array_free(percpu->scribble); | |
789b5e03 ON |
6721 | percpu->spare_page = NULL; |
6722 | percpu->scribble = NULL; | |
6723 | } | |
6724 | ||
6725 | static int alloc_scratch_buffer(struct r5conf *conf, struct raid5_percpu *percpu) | |
6726 | { | |
6727 | if (conf->level == 6 && !percpu->spare_page) | |
6728 | percpu->spare_page = alloc_page(GFP_KERNEL); | |
6729 | if (!percpu->scribble) | |
46d5b785 | 6730 | percpu->scribble = scribble_alloc(max(conf->raid_disks, |
738a2738 N |
6731 | conf->previous_raid_disks), |
6732 | max(conf->chunk_sectors, | |
6733 | conf->prev_chunk_sectors) | |
6734 | / STRIPE_SECTORS, | |
6735 | GFP_KERNEL); | |
789b5e03 ON |
6736 | |
6737 | if (!percpu->scribble || (conf->level == 6 && !percpu->spare_page)) { | |
6738 | free_scratch_buffer(conf, percpu); | |
6739 | return -ENOMEM; | |
6740 | } | |
6741 | ||
6742 | return 0; | |
6743 | } | |
6744 | ||
29c6d1bb | 6745 | static int raid456_cpu_dead(unsigned int cpu, struct hlist_node *node) |
36d1c647 | 6746 | { |
29c6d1bb SAS |
6747 | struct r5conf *conf = hlist_entry_safe(node, struct r5conf, node); |
6748 | ||
6749 | free_scratch_buffer(conf, per_cpu_ptr(conf->percpu, cpu)); | |
6750 | return 0; | |
6751 | } | |
36d1c647 | 6752 | |
29c6d1bb SAS |
6753 | static void raid5_free_percpu(struct r5conf *conf) |
6754 | { | |
36d1c647 DW |
6755 | if (!conf->percpu) |
6756 | return; | |
6757 | ||
29c6d1bb | 6758 | cpuhp_state_remove_instance(CPUHP_MD_RAID5_PREPARE, &conf->node); |
36d1c647 DW |
6759 | free_percpu(conf->percpu); |
6760 | } | |
6761 | ||
d1688a6d | 6762 | static void free_conf(struct r5conf *conf) |
95fc17aa | 6763 | { |
d7bd398e SL |
6764 | int i; |
6765 | ||
ff875738 AP |
6766 | log_exit(conf); |
6767 | ||
565e0450 | 6768 | unregister_shrinker(&conf->shrinker); |
851c30c9 | 6769 | free_thread_groups(conf); |
95fc17aa | 6770 | shrink_stripes(conf); |
36d1c647 | 6771 | raid5_free_percpu(conf); |
d7bd398e SL |
6772 | for (i = 0; i < conf->pool_size; i++) |
6773 | if (conf->disks[i].extra_page) | |
6774 | put_page(conf->disks[i].extra_page); | |
95fc17aa | 6775 | kfree(conf->disks); |
dd7a8f5d N |
6776 | if (conf->bio_split) |
6777 | bioset_free(conf->bio_split); | |
95fc17aa | 6778 | kfree(conf->stripe_hashtbl); |
aaf9f12e | 6779 | kfree(conf->pending_data); |
95fc17aa DW |
6780 | kfree(conf); |
6781 | } | |
6782 | ||
29c6d1bb | 6783 | static int raid456_cpu_up_prepare(unsigned int cpu, struct hlist_node *node) |
36d1c647 | 6784 | { |
29c6d1bb | 6785 | struct r5conf *conf = hlist_entry_safe(node, struct r5conf, node); |
36d1c647 DW |
6786 | struct raid5_percpu *percpu = per_cpu_ptr(conf->percpu, cpu); |
6787 | ||
29c6d1bb | 6788 | if (alloc_scratch_buffer(conf, percpu)) { |
cc6167b4 N |
6789 | pr_warn("%s: failed memory allocation for cpu%u\n", |
6790 | __func__, cpu); | |
29c6d1bb | 6791 | return -ENOMEM; |
36d1c647 | 6792 | } |
29c6d1bb | 6793 | return 0; |
36d1c647 | 6794 | } |
36d1c647 | 6795 | |
d1688a6d | 6796 | static int raid5_alloc_percpu(struct r5conf *conf) |
36d1c647 | 6797 | { |
789b5e03 | 6798 | int err = 0; |
36d1c647 | 6799 | |
789b5e03 ON |
6800 | conf->percpu = alloc_percpu(struct raid5_percpu); |
6801 | if (!conf->percpu) | |
36d1c647 | 6802 | return -ENOMEM; |
789b5e03 | 6803 | |
29c6d1bb | 6804 | err = cpuhp_state_add_instance(CPUHP_MD_RAID5_PREPARE, &conf->node); |
27a353c0 SL |
6805 | if (!err) { |
6806 | conf->scribble_disks = max(conf->raid_disks, | |
6807 | conf->previous_raid_disks); | |
6808 | conf->scribble_sectors = max(conf->chunk_sectors, | |
6809 | conf->prev_chunk_sectors); | |
6810 | } | |
36d1c647 DW |
6811 | return err; |
6812 | } | |
6813 | ||
edbe83ab N |
6814 | static unsigned long raid5_cache_scan(struct shrinker *shrink, |
6815 | struct shrink_control *sc) | |
6816 | { | |
6817 | struct r5conf *conf = container_of(shrink, struct r5conf, shrinker); | |
2d5b569b N |
6818 | unsigned long ret = SHRINK_STOP; |
6819 | ||
6820 | if (mutex_trylock(&conf->cache_size_mutex)) { | |
6821 | ret= 0; | |
49895bcc N |
6822 | while (ret < sc->nr_to_scan && |
6823 | conf->max_nr_stripes > conf->min_nr_stripes) { | |
2d5b569b N |
6824 | if (drop_one_stripe(conf) == 0) { |
6825 | ret = SHRINK_STOP; | |
6826 | break; | |
6827 | } | |
6828 | ret++; | |
6829 | } | |
6830 | mutex_unlock(&conf->cache_size_mutex); | |
edbe83ab N |
6831 | } |
6832 | return ret; | |
6833 | } | |
6834 | ||
6835 | static unsigned long raid5_cache_count(struct shrinker *shrink, | |
6836 | struct shrink_control *sc) | |
6837 | { | |
6838 | struct r5conf *conf = container_of(shrink, struct r5conf, shrinker); | |
6839 | ||
6840 | if (conf->max_nr_stripes < conf->min_nr_stripes) | |
6841 | /* unlikely, but not impossible */ | |
6842 | return 0; | |
6843 | return conf->max_nr_stripes - conf->min_nr_stripes; | |
6844 | } | |
6845 | ||
d1688a6d | 6846 | static struct r5conf *setup_conf(struct mddev *mddev) |
1da177e4 | 6847 | { |
d1688a6d | 6848 | struct r5conf *conf; |
5e5e3e78 | 6849 | int raid_disk, memory, max_disks; |
3cb03002 | 6850 | struct md_rdev *rdev; |
1da177e4 | 6851 | struct disk_info *disk; |
0232605d | 6852 | char pers_name[6]; |
566c09c5 | 6853 | int i; |
60aaf933 | 6854 | int group_cnt, worker_cnt_per_group; |
6855 | struct r5worker_group *new_group; | |
1da177e4 | 6856 | |
91adb564 N |
6857 | if (mddev->new_level != 5 |
6858 | && mddev->new_level != 4 | |
6859 | && mddev->new_level != 6) { | |
cc6167b4 N |
6860 | pr_warn("md/raid:%s: raid level not set to 4/5/6 (%d)\n", |
6861 | mdname(mddev), mddev->new_level); | |
91adb564 | 6862 | return ERR_PTR(-EIO); |
1da177e4 | 6863 | } |
91adb564 N |
6864 | if ((mddev->new_level == 5 |
6865 | && !algorithm_valid_raid5(mddev->new_layout)) || | |
6866 | (mddev->new_level == 6 | |
6867 | && !algorithm_valid_raid6(mddev->new_layout))) { | |
cc6167b4 N |
6868 | pr_warn("md/raid:%s: layout %d not supported\n", |
6869 | mdname(mddev), mddev->new_layout); | |
91adb564 | 6870 | return ERR_PTR(-EIO); |
99c0fb5f | 6871 | } |
91adb564 | 6872 | if (mddev->new_level == 6 && mddev->raid_disks < 4) { |
cc6167b4 N |
6873 | pr_warn("md/raid:%s: not enough configured devices (%d, minimum 4)\n", |
6874 | mdname(mddev), mddev->raid_disks); | |
91adb564 | 6875 | return ERR_PTR(-EINVAL); |
4bbf3771 N |
6876 | } |
6877 | ||
664e7c41 AN |
6878 | if (!mddev->new_chunk_sectors || |
6879 | (mddev->new_chunk_sectors << 9) % PAGE_SIZE || | |
6880 | !is_power_of_2(mddev->new_chunk_sectors)) { | |
cc6167b4 N |
6881 | pr_warn("md/raid:%s: invalid chunk size %d\n", |
6882 | mdname(mddev), mddev->new_chunk_sectors << 9); | |
91adb564 | 6883 | return ERR_PTR(-EINVAL); |
f6705578 N |
6884 | } |
6885 | ||
d1688a6d | 6886 | conf = kzalloc(sizeof(struct r5conf), GFP_KERNEL); |
91adb564 | 6887 | if (conf == NULL) |
1da177e4 | 6888 | goto abort; |
aaf9f12e SL |
6889 | INIT_LIST_HEAD(&conf->free_list); |
6890 | INIT_LIST_HEAD(&conf->pending_list); | |
6891 | conf->pending_data = kzalloc(sizeof(struct r5pending_data) * | |
6892 | PENDING_IO_MAX, GFP_KERNEL); | |
6893 | if (!conf->pending_data) | |
6894 | goto abort; | |
6895 | for (i = 0; i < PENDING_IO_MAX; i++) | |
6896 | list_add(&conf->pending_data[i].sibling, &conf->free_list); | |
851c30c9 | 6897 | /* Don't enable multi-threading by default*/ |
60aaf933 | 6898 | if (!alloc_thread_groups(conf, 0, &group_cnt, &worker_cnt_per_group, |
6899 | &new_group)) { | |
6900 | conf->group_cnt = group_cnt; | |
6901 | conf->worker_cnt_per_group = worker_cnt_per_group; | |
6902 | conf->worker_groups = new_group; | |
6903 | } else | |
851c30c9 | 6904 | goto abort; |
f5efd45a | 6905 | spin_lock_init(&conf->device_lock); |
c46501b2 | 6906 | seqcount_init(&conf->gen_lock); |
2d5b569b | 6907 | mutex_init(&conf->cache_size_mutex); |
b1b46486 | 6908 | init_waitqueue_head(&conf->wait_for_quiescent); |
6ab2a4b8 | 6909 | init_waitqueue_head(&conf->wait_for_stripe); |
f5efd45a DW |
6910 | init_waitqueue_head(&conf->wait_for_overlap); |
6911 | INIT_LIST_HEAD(&conf->handle_list); | |
535ae4eb | 6912 | INIT_LIST_HEAD(&conf->loprio_list); |
f5efd45a DW |
6913 | INIT_LIST_HEAD(&conf->hold_list); |
6914 | INIT_LIST_HEAD(&conf->delayed_list); | |
6915 | INIT_LIST_HEAD(&conf->bitmap_list); | |
773ca82f | 6916 | init_llist_head(&conf->released_stripes); |
f5efd45a DW |
6917 | atomic_set(&conf->active_stripes, 0); |
6918 | atomic_set(&conf->preread_active_stripes, 0); | |
6919 | atomic_set(&conf->active_aligned_reads, 0); | |
765d704d SL |
6920 | spin_lock_init(&conf->pending_bios_lock); |
6921 | conf->batch_bio_dispatch = true; | |
6922 | rdev_for_each(rdev, mddev) { | |
6923 | if (test_bit(Journal, &rdev->flags)) | |
6924 | continue; | |
6925 | if (blk_queue_nonrot(bdev_get_queue(rdev->bdev))) { | |
6926 | conf->batch_bio_dispatch = false; | |
6927 | break; | |
6928 | } | |
6929 | } | |
6930 | ||
f5efd45a | 6931 | conf->bypass_threshold = BYPASS_THRESHOLD; |
d890fa2b | 6932 | conf->recovery_disabled = mddev->recovery_disabled - 1; |
91adb564 N |
6933 | |
6934 | conf->raid_disks = mddev->raid_disks; | |
6935 | if (mddev->reshape_position == MaxSector) | |
6936 | conf->previous_raid_disks = mddev->raid_disks; | |
6937 | else | |
f6705578 | 6938 | conf->previous_raid_disks = mddev->raid_disks - mddev->delta_disks; |
5e5e3e78 | 6939 | max_disks = max(conf->raid_disks, conf->previous_raid_disks); |
f6705578 | 6940 | |
5e5e3e78 | 6941 | conf->disks = kzalloc(max_disks * sizeof(struct disk_info), |
b55e6bfc | 6942 | GFP_KERNEL); |
d7bd398e | 6943 | |
b55e6bfc N |
6944 | if (!conf->disks) |
6945 | goto abort; | |
9ffae0cf | 6946 | |
d7bd398e SL |
6947 | for (i = 0; i < max_disks; i++) { |
6948 | conf->disks[i].extra_page = alloc_page(GFP_KERNEL); | |
6949 | if (!conf->disks[i].extra_page) | |
6950 | goto abort; | |
6951 | } | |
6952 | ||
011067b0 | 6953 | conf->bio_split = bioset_create(BIO_POOL_SIZE, 0, 0); |
dd7a8f5d N |
6954 | if (!conf->bio_split) |
6955 | goto abort; | |
1da177e4 LT |
6956 | conf->mddev = mddev; |
6957 | ||
fccddba0 | 6958 | if ((conf->stripe_hashtbl = kzalloc(PAGE_SIZE, GFP_KERNEL)) == NULL) |
1da177e4 | 6959 | goto abort; |
1da177e4 | 6960 | |
566c09c5 SL |
6961 | /* We init hash_locks[0] separately to that it can be used |
6962 | * as the reference lock in the spin_lock_nest_lock() call | |
6963 | * in lock_all_device_hash_locks_irq in order to convince | |
6964 | * lockdep that we know what we are doing. | |
6965 | */ | |
6966 | spin_lock_init(conf->hash_locks); | |
6967 | for (i = 1; i < NR_STRIPE_HASH_LOCKS; i++) | |
6968 | spin_lock_init(conf->hash_locks + i); | |
6969 | ||
6970 | for (i = 0; i < NR_STRIPE_HASH_LOCKS; i++) | |
6971 | INIT_LIST_HEAD(conf->inactive_list + i); | |
6972 | ||
6973 | for (i = 0; i < NR_STRIPE_HASH_LOCKS; i++) | |
6974 | INIT_LIST_HEAD(conf->temp_inactive_list + i); | |
6975 | ||
1e6d690b SL |
6976 | atomic_set(&conf->r5c_cached_full_stripes, 0); |
6977 | INIT_LIST_HEAD(&conf->r5c_full_stripe_list); | |
6978 | atomic_set(&conf->r5c_cached_partial_stripes, 0); | |
6979 | INIT_LIST_HEAD(&conf->r5c_partial_stripe_list); | |
e33fbb9c SL |
6980 | atomic_set(&conf->r5c_flushing_full_stripes, 0); |
6981 | atomic_set(&conf->r5c_flushing_partial_stripes, 0); | |
1e6d690b | 6982 | |
36d1c647 | 6983 | conf->level = mddev->new_level; |
46d5b785 | 6984 | conf->chunk_sectors = mddev->new_chunk_sectors; |
36d1c647 DW |
6985 | if (raid5_alloc_percpu(conf) != 0) |
6986 | goto abort; | |
6987 | ||
0c55e022 | 6988 | pr_debug("raid456: run(%s) called.\n", mdname(mddev)); |
1da177e4 | 6989 | |
dafb20fa | 6990 | rdev_for_each(rdev, mddev) { |
1da177e4 | 6991 | raid_disk = rdev->raid_disk; |
5e5e3e78 | 6992 | if (raid_disk >= max_disks |
f2076e7d | 6993 | || raid_disk < 0 || test_bit(Journal, &rdev->flags)) |
1da177e4 LT |
6994 | continue; |
6995 | disk = conf->disks + raid_disk; | |
6996 | ||
17045f52 N |
6997 | if (test_bit(Replacement, &rdev->flags)) { |
6998 | if (disk->replacement) | |
6999 | goto abort; | |
7000 | disk->replacement = rdev; | |
7001 | } else { | |
7002 | if (disk->rdev) | |
7003 | goto abort; | |
7004 | disk->rdev = rdev; | |
7005 | } | |
1da177e4 | 7006 | |
b2d444d7 | 7007 | if (test_bit(In_sync, &rdev->flags)) { |
1da177e4 | 7008 | char b[BDEVNAME_SIZE]; |
cc6167b4 N |
7009 | pr_info("md/raid:%s: device %s operational as raid disk %d\n", |
7010 | mdname(mddev), bdevname(rdev->bdev, b), raid_disk); | |
d6b212f4 | 7011 | } else if (rdev->saved_raid_disk != raid_disk) |
8c2e870a NB |
7012 | /* Cannot rely on bitmap to complete recovery */ |
7013 | conf->fullsync = 1; | |
1da177e4 LT |
7014 | } |
7015 | ||
91adb564 | 7016 | conf->level = mddev->new_level; |
584acdd4 | 7017 | if (conf->level == 6) { |
16a53ecc | 7018 | conf->max_degraded = 2; |
584acdd4 MS |
7019 | if (raid6_call.xor_syndrome) |
7020 | conf->rmw_level = PARITY_ENABLE_RMW; | |
7021 | else | |
7022 | conf->rmw_level = PARITY_DISABLE_RMW; | |
7023 | } else { | |
16a53ecc | 7024 | conf->max_degraded = 1; |
584acdd4 MS |
7025 | conf->rmw_level = PARITY_ENABLE_RMW; |
7026 | } | |
91adb564 | 7027 | conf->algorithm = mddev->new_layout; |
fef9c61f | 7028 | conf->reshape_progress = mddev->reshape_position; |
e183eaed | 7029 | if (conf->reshape_progress != MaxSector) { |
09c9e5fa | 7030 | conf->prev_chunk_sectors = mddev->chunk_sectors; |
e183eaed | 7031 | conf->prev_algo = mddev->layout; |
5cac6bcb N |
7032 | } else { |
7033 | conf->prev_chunk_sectors = conf->chunk_sectors; | |
7034 | conf->prev_algo = conf->algorithm; | |
e183eaed | 7035 | } |
1da177e4 | 7036 | |
edbe83ab | 7037 | conf->min_nr_stripes = NR_STRIPES; |
ad5b0f76 SL |
7038 | if (mddev->reshape_position != MaxSector) { |
7039 | int stripes = max_t(int, | |
7040 | ((mddev->chunk_sectors << 9) / STRIPE_SIZE) * 4, | |
7041 | ((mddev->new_chunk_sectors << 9) / STRIPE_SIZE) * 4); | |
7042 | conf->min_nr_stripes = max(NR_STRIPES, stripes); | |
7043 | if (conf->min_nr_stripes != NR_STRIPES) | |
cc6167b4 | 7044 | pr_info("md/raid:%s: force stripe size %d for reshape\n", |
ad5b0f76 SL |
7045 | mdname(mddev), conf->min_nr_stripes); |
7046 | } | |
edbe83ab | 7047 | memory = conf->min_nr_stripes * (sizeof(struct stripe_head) + |
5e5e3e78 | 7048 | max_disks * ((sizeof(struct bio) + PAGE_SIZE))) / 1024; |
4bda556a | 7049 | atomic_set(&conf->empty_inactive_list_nr, NR_STRIPE_HASH_LOCKS); |
edbe83ab | 7050 | if (grow_stripes(conf, conf->min_nr_stripes)) { |
cc6167b4 N |
7051 | pr_warn("md/raid:%s: couldn't allocate %dkB for buffers\n", |
7052 | mdname(mddev), memory); | |
91adb564 N |
7053 | goto abort; |
7054 | } else | |
cc6167b4 | 7055 | pr_debug("md/raid:%s: allocated %dkB\n", mdname(mddev), memory); |
edbe83ab N |
7056 | /* |
7057 | * Losing a stripe head costs more than the time to refill it, | |
7058 | * it reduces the queue depth and so can hurt throughput. | |
7059 | * So set it rather large, scaled by number of devices. | |
7060 | */ | |
7061 | conf->shrinker.seeks = DEFAULT_SEEKS * conf->raid_disks * 4; | |
7062 | conf->shrinker.scan_objects = raid5_cache_scan; | |
7063 | conf->shrinker.count_objects = raid5_cache_count; | |
7064 | conf->shrinker.batch = 128; | |
7065 | conf->shrinker.flags = 0; | |
6a0f53ff | 7066 | if (register_shrinker(&conf->shrinker)) { |
cc6167b4 N |
7067 | pr_warn("md/raid:%s: couldn't register shrinker.\n", |
7068 | mdname(mddev)); | |
6a0f53ff CY |
7069 | goto abort; |
7070 | } | |
1da177e4 | 7071 | |
0232605d N |
7072 | sprintf(pers_name, "raid%d", mddev->new_level); |
7073 | conf->thread = md_register_thread(raid5d, mddev, pers_name); | |
91adb564 | 7074 | if (!conf->thread) { |
cc6167b4 N |
7075 | pr_warn("md/raid:%s: couldn't allocate thread.\n", |
7076 | mdname(mddev)); | |
16a53ecc N |
7077 | goto abort; |
7078 | } | |
91adb564 N |
7079 | |
7080 | return conf; | |
7081 | ||
7082 | abort: | |
7083 | if (conf) { | |
95fc17aa | 7084 | free_conf(conf); |
91adb564 N |
7085 | return ERR_PTR(-EIO); |
7086 | } else | |
7087 | return ERR_PTR(-ENOMEM); | |
7088 | } | |
7089 | ||
c148ffdc N |
7090 | static int only_parity(int raid_disk, int algo, int raid_disks, int max_degraded) |
7091 | { | |
7092 | switch (algo) { | |
7093 | case ALGORITHM_PARITY_0: | |
7094 | if (raid_disk < max_degraded) | |
7095 | return 1; | |
7096 | break; | |
7097 | case ALGORITHM_PARITY_N: | |
7098 | if (raid_disk >= raid_disks - max_degraded) | |
7099 | return 1; | |
7100 | break; | |
7101 | case ALGORITHM_PARITY_0_6: | |
f72ffdd6 | 7102 | if (raid_disk == 0 || |
c148ffdc N |
7103 | raid_disk == raid_disks - 1) |
7104 | return 1; | |
7105 | break; | |
7106 | case ALGORITHM_LEFT_ASYMMETRIC_6: | |
7107 | case ALGORITHM_RIGHT_ASYMMETRIC_6: | |
7108 | case ALGORITHM_LEFT_SYMMETRIC_6: | |
7109 | case ALGORITHM_RIGHT_SYMMETRIC_6: | |
7110 | if (raid_disk == raid_disks - 1) | |
7111 | return 1; | |
7112 | } | |
7113 | return 0; | |
7114 | } | |
7115 | ||
849674e4 | 7116 | static int raid5_run(struct mddev *mddev) |
91adb564 | 7117 | { |
d1688a6d | 7118 | struct r5conf *conf; |
9f7c2220 | 7119 | int working_disks = 0; |
c148ffdc | 7120 | int dirty_parity_disks = 0; |
3cb03002 | 7121 | struct md_rdev *rdev; |
713cf5a6 | 7122 | struct md_rdev *journal_dev = NULL; |
c148ffdc | 7123 | sector_t reshape_offset = 0; |
17045f52 | 7124 | int i; |
b5254dd5 N |
7125 | long long min_offset_diff = 0; |
7126 | int first = 1; | |
91adb564 | 7127 | |
a415c0f1 N |
7128 | if (mddev_init_writes_pending(mddev) < 0) |
7129 | return -ENOMEM; | |
7130 | ||
8c6ac868 | 7131 | if (mddev->recovery_cp != MaxSector) |
cc6167b4 N |
7132 | pr_notice("md/raid:%s: not clean -- starting background reconstruction\n", |
7133 | mdname(mddev)); | |
b5254dd5 N |
7134 | |
7135 | rdev_for_each(rdev, mddev) { | |
7136 | long long diff; | |
713cf5a6 | 7137 | |
f2076e7d | 7138 | if (test_bit(Journal, &rdev->flags)) { |
713cf5a6 | 7139 | journal_dev = rdev; |
f2076e7d SL |
7140 | continue; |
7141 | } | |
b5254dd5 N |
7142 | if (rdev->raid_disk < 0) |
7143 | continue; | |
7144 | diff = (rdev->new_data_offset - rdev->data_offset); | |
7145 | if (first) { | |
7146 | min_offset_diff = diff; | |
7147 | first = 0; | |
7148 | } else if (mddev->reshape_backwards && | |
7149 | diff < min_offset_diff) | |
7150 | min_offset_diff = diff; | |
7151 | else if (!mddev->reshape_backwards && | |
7152 | diff > min_offset_diff) | |
7153 | min_offset_diff = diff; | |
7154 | } | |
7155 | ||
230b55fa N |
7156 | if ((test_bit(MD_HAS_JOURNAL, &mddev->flags) || journal_dev) && |
7157 | (mddev->bitmap_info.offset || mddev->bitmap_info.file)) { | |
7158 | pr_notice("md/raid:%s: array cannot have both journal and bitmap\n", | |
7159 | mdname(mddev)); | |
7160 | return -EINVAL; | |
7161 | } | |
7162 | ||
91adb564 N |
7163 | if (mddev->reshape_position != MaxSector) { |
7164 | /* Check that we can continue the reshape. | |
b5254dd5 N |
7165 | * Difficulties arise if the stripe we would write to |
7166 | * next is at or after the stripe we would read from next. | |
7167 | * For a reshape that changes the number of devices, this | |
7168 | * is only possible for a very short time, and mdadm makes | |
7169 | * sure that time appears to have past before assembling | |
7170 | * the array. So we fail if that time hasn't passed. | |
7171 | * For a reshape that keeps the number of devices the same | |
7172 | * mdadm must be monitoring the reshape can keeping the | |
7173 | * critical areas read-only and backed up. It will start | |
7174 | * the array in read-only mode, so we check for that. | |
91adb564 N |
7175 | */ |
7176 | sector_t here_new, here_old; | |
7177 | int old_disks; | |
18b00334 | 7178 | int max_degraded = (mddev->level == 6 ? 2 : 1); |
05256d98 N |
7179 | int chunk_sectors; |
7180 | int new_data_disks; | |
91adb564 | 7181 | |
713cf5a6 | 7182 | if (journal_dev) { |
cc6167b4 N |
7183 | pr_warn("md/raid:%s: don't support reshape with journal - aborting.\n", |
7184 | mdname(mddev)); | |
713cf5a6 SL |
7185 | return -EINVAL; |
7186 | } | |
7187 | ||
88ce4930 | 7188 | if (mddev->new_level != mddev->level) { |
cc6167b4 N |
7189 | pr_warn("md/raid:%s: unsupported reshape required - aborting.\n", |
7190 | mdname(mddev)); | |
91adb564 N |
7191 | return -EINVAL; |
7192 | } | |
91adb564 N |
7193 | old_disks = mddev->raid_disks - mddev->delta_disks; |
7194 | /* reshape_position must be on a new-stripe boundary, and one | |
7195 | * further up in new geometry must map after here in old | |
7196 | * geometry. | |
05256d98 N |
7197 | * If the chunk sizes are different, then as we perform reshape |
7198 | * in units of the largest of the two, reshape_position needs | |
7199 | * be a multiple of the largest chunk size times new data disks. | |
91adb564 N |
7200 | */ |
7201 | here_new = mddev->reshape_position; | |
05256d98 N |
7202 | chunk_sectors = max(mddev->chunk_sectors, mddev->new_chunk_sectors); |
7203 | new_data_disks = mddev->raid_disks - max_degraded; | |
7204 | if (sector_div(here_new, chunk_sectors * new_data_disks)) { | |
cc6167b4 N |
7205 | pr_warn("md/raid:%s: reshape_position not on a stripe boundary\n", |
7206 | mdname(mddev)); | |
91adb564 N |
7207 | return -EINVAL; |
7208 | } | |
05256d98 | 7209 | reshape_offset = here_new * chunk_sectors; |
91adb564 N |
7210 | /* here_new is the stripe we will write to */ |
7211 | here_old = mddev->reshape_position; | |
05256d98 | 7212 | sector_div(here_old, chunk_sectors * (old_disks-max_degraded)); |
91adb564 N |
7213 | /* here_old is the first stripe that we might need to read |
7214 | * from */ | |
67ac6011 N |
7215 | if (mddev->delta_disks == 0) { |
7216 | /* We cannot be sure it is safe to start an in-place | |
b5254dd5 | 7217 | * reshape. It is only safe if user-space is monitoring |
67ac6011 N |
7218 | * and taking constant backups. |
7219 | * mdadm always starts a situation like this in | |
7220 | * readonly mode so it can take control before | |
7221 | * allowing any writes. So just check for that. | |
7222 | */ | |
b5254dd5 N |
7223 | if (abs(min_offset_diff) >= mddev->chunk_sectors && |
7224 | abs(min_offset_diff) >= mddev->new_chunk_sectors) | |
7225 | /* not really in-place - so OK */; | |
7226 | else if (mddev->ro == 0) { | |
cc6167b4 N |
7227 | pr_warn("md/raid:%s: in-place reshape must be started in read-only mode - aborting\n", |
7228 | mdname(mddev)); | |
67ac6011 N |
7229 | return -EINVAL; |
7230 | } | |
2c810cdd | 7231 | } else if (mddev->reshape_backwards |
05256d98 N |
7232 | ? (here_new * chunk_sectors + min_offset_diff <= |
7233 | here_old * chunk_sectors) | |
7234 | : (here_new * chunk_sectors >= | |
7235 | here_old * chunk_sectors + (-min_offset_diff))) { | |
91adb564 | 7236 | /* Reading from the same stripe as writing to - bad */ |
cc6167b4 N |
7237 | pr_warn("md/raid:%s: reshape_position too early for auto-recovery - aborting.\n", |
7238 | mdname(mddev)); | |
91adb564 N |
7239 | return -EINVAL; |
7240 | } | |
cc6167b4 | 7241 | pr_debug("md/raid:%s: reshape will continue\n", mdname(mddev)); |
91adb564 N |
7242 | /* OK, we should be able to continue; */ |
7243 | } else { | |
7244 | BUG_ON(mddev->level != mddev->new_level); | |
7245 | BUG_ON(mddev->layout != mddev->new_layout); | |
664e7c41 | 7246 | BUG_ON(mddev->chunk_sectors != mddev->new_chunk_sectors); |
91adb564 | 7247 | BUG_ON(mddev->delta_disks != 0); |
1da177e4 | 7248 | } |
91adb564 | 7249 | |
3418d036 AP |
7250 | if (test_bit(MD_HAS_JOURNAL, &mddev->flags) && |
7251 | test_bit(MD_HAS_PPL, &mddev->flags)) { | |
7252 | pr_warn("md/raid:%s: using journal device and PPL not allowed - disabling PPL\n", | |
7253 | mdname(mddev)); | |
7254 | clear_bit(MD_HAS_PPL, &mddev->flags); | |
ddc08823 | 7255 | clear_bit(MD_HAS_MULTIPLE_PPLS, &mddev->flags); |
3418d036 AP |
7256 | } |
7257 | ||
245f46c2 N |
7258 | if (mddev->private == NULL) |
7259 | conf = setup_conf(mddev); | |
7260 | else | |
7261 | conf = mddev->private; | |
7262 | ||
91adb564 N |
7263 | if (IS_ERR(conf)) |
7264 | return PTR_ERR(conf); | |
7265 | ||
486b0f7b SL |
7266 | if (test_bit(MD_HAS_JOURNAL, &mddev->flags)) { |
7267 | if (!journal_dev) { | |
cc6167b4 N |
7268 | pr_warn("md/raid:%s: journal disk is missing, force array readonly\n", |
7269 | mdname(mddev)); | |
486b0f7b SL |
7270 | mddev->ro = 1; |
7271 | set_disk_ro(mddev->gendisk, 1); | |
7272 | } else if (mddev->recovery_cp == MaxSector) | |
7273 | set_bit(MD_JOURNAL_CLEAN, &mddev->flags); | |
7dde2ad3 SL |
7274 | } |
7275 | ||
b5254dd5 | 7276 | conf->min_offset_diff = min_offset_diff; |
91adb564 N |
7277 | mddev->thread = conf->thread; |
7278 | conf->thread = NULL; | |
7279 | mddev->private = conf; | |
7280 | ||
17045f52 N |
7281 | for (i = 0; i < conf->raid_disks && conf->previous_raid_disks; |
7282 | i++) { | |
7283 | rdev = conf->disks[i].rdev; | |
7284 | if (!rdev && conf->disks[i].replacement) { | |
7285 | /* The replacement is all we have yet */ | |
7286 | rdev = conf->disks[i].replacement; | |
7287 | conf->disks[i].replacement = NULL; | |
7288 | clear_bit(Replacement, &rdev->flags); | |
7289 | conf->disks[i].rdev = rdev; | |
7290 | } | |
7291 | if (!rdev) | |
c148ffdc | 7292 | continue; |
17045f52 N |
7293 | if (conf->disks[i].replacement && |
7294 | conf->reshape_progress != MaxSector) { | |
7295 | /* replacements and reshape simply do not mix. */ | |
cc6167b4 | 7296 | pr_warn("md: cannot handle concurrent replacement and reshape.\n"); |
17045f52 N |
7297 | goto abort; |
7298 | } | |
2f115882 | 7299 | if (test_bit(In_sync, &rdev->flags)) { |
91adb564 | 7300 | working_disks++; |
2f115882 N |
7301 | continue; |
7302 | } | |
c148ffdc N |
7303 | /* This disc is not fully in-sync. However if it |
7304 | * just stored parity (beyond the recovery_offset), | |
7305 | * when we don't need to be concerned about the | |
7306 | * array being dirty. | |
7307 | * When reshape goes 'backwards', we never have | |
7308 | * partially completed devices, so we only need | |
7309 | * to worry about reshape going forwards. | |
7310 | */ | |
7311 | /* Hack because v0.91 doesn't store recovery_offset properly. */ | |
7312 | if (mddev->major_version == 0 && | |
7313 | mddev->minor_version > 90) | |
7314 | rdev->recovery_offset = reshape_offset; | |
5026d7a9 | 7315 | |
c148ffdc N |
7316 | if (rdev->recovery_offset < reshape_offset) { |
7317 | /* We need to check old and new layout */ | |
7318 | if (!only_parity(rdev->raid_disk, | |
7319 | conf->algorithm, | |
7320 | conf->raid_disks, | |
7321 | conf->max_degraded)) | |
7322 | continue; | |
7323 | } | |
7324 | if (!only_parity(rdev->raid_disk, | |
7325 | conf->prev_algo, | |
7326 | conf->previous_raid_disks, | |
7327 | conf->max_degraded)) | |
7328 | continue; | |
7329 | dirty_parity_disks++; | |
7330 | } | |
91adb564 | 7331 | |
17045f52 N |
7332 | /* |
7333 | * 0 for a fully functional array, 1 or 2 for a degraded array. | |
7334 | */ | |
2e38a37f | 7335 | mddev->degraded = raid5_calc_degraded(conf); |
91adb564 | 7336 | |
674806d6 | 7337 | if (has_failed(conf)) { |
cc6167b4 | 7338 | pr_crit("md/raid:%s: not enough operational devices (%d/%d failed)\n", |
02c2de8c | 7339 | mdname(mddev), mddev->degraded, conf->raid_disks); |
1da177e4 LT |
7340 | goto abort; |
7341 | } | |
7342 | ||
91adb564 | 7343 | /* device size must be a multiple of chunk size */ |
9d8f0363 | 7344 | mddev->dev_sectors &= ~(mddev->chunk_sectors - 1); |
91adb564 N |
7345 | mddev->resync_max_sectors = mddev->dev_sectors; |
7346 | ||
c148ffdc | 7347 | if (mddev->degraded > dirty_parity_disks && |
1da177e4 | 7348 | mddev->recovery_cp != MaxSector) { |
4536bf9b AP |
7349 | if (test_bit(MD_HAS_PPL, &mddev->flags)) |
7350 | pr_crit("md/raid:%s: starting dirty degraded array with PPL.\n", | |
7351 | mdname(mddev)); | |
7352 | else if (mddev->ok_start_degraded) | |
cc6167b4 N |
7353 | pr_crit("md/raid:%s: starting dirty degraded array - data corruption possible.\n", |
7354 | mdname(mddev)); | |
6ff8d8ec | 7355 | else { |
cc6167b4 N |
7356 | pr_crit("md/raid:%s: cannot start dirty degraded array.\n", |
7357 | mdname(mddev)); | |
6ff8d8ec N |
7358 | goto abort; |
7359 | } | |
1da177e4 LT |
7360 | } |
7361 | ||
cc6167b4 N |
7362 | pr_info("md/raid:%s: raid level %d active with %d out of %d devices, algorithm %d\n", |
7363 | mdname(mddev), conf->level, | |
7364 | mddev->raid_disks-mddev->degraded, mddev->raid_disks, | |
7365 | mddev->new_layout); | |
1da177e4 LT |
7366 | |
7367 | print_raid5_conf(conf); | |
7368 | ||
fef9c61f | 7369 | if (conf->reshape_progress != MaxSector) { |
fef9c61f | 7370 | conf->reshape_safe = conf->reshape_progress; |
f6705578 N |
7371 | atomic_set(&conf->reshape_stripes, 0); |
7372 | clear_bit(MD_RECOVERY_SYNC, &mddev->recovery); | |
7373 | clear_bit(MD_RECOVERY_CHECK, &mddev->recovery); | |
7374 | set_bit(MD_RECOVERY_RESHAPE, &mddev->recovery); | |
7375 | set_bit(MD_RECOVERY_RUNNING, &mddev->recovery); | |
7376 | mddev->sync_thread = md_register_thread(md_do_sync, mddev, | |
0da3c619 | 7377 | "reshape"); |
f6705578 N |
7378 | } |
7379 | ||
1da177e4 | 7380 | /* Ok, everything is just fine now */ |
a64c876f N |
7381 | if (mddev->to_remove == &raid5_attrs_group) |
7382 | mddev->to_remove = NULL; | |
00bcb4ac N |
7383 | else if (mddev->kobj.sd && |
7384 | sysfs_create_group(&mddev->kobj, &raid5_attrs_group)) | |
cc6167b4 N |
7385 | pr_warn("raid5: failed to create sysfs attributes for %s\n", |
7386 | mdname(mddev)); | |
4a5add49 | 7387 | md_set_array_sectors(mddev, raid5_size(mddev, 0, 0)); |
7a5febe9 | 7388 | |
4a5add49 | 7389 | if (mddev->queue) { |
9f7c2220 | 7390 | int chunk_size; |
4a5add49 N |
7391 | /* read-ahead size must cover two whole stripes, which |
7392 | * is 2 * (datadisks) * chunksize where 'n' is the | |
7393 | * number of raid devices | |
7394 | */ | |
7395 | int data_disks = conf->previous_raid_disks - conf->max_degraded; | |
7396 | int stripe = data_disks * | |
7397 | ((mddev->chunk_sectors << 9) / PAGE_SIZE); | |
dc3b17cc JK |
7398 | if (mddev->queue->backing_dev_info->ra_pages < 2 * stripe) |
7399 | mddev->queue->backing_dev_info->ra_pages = 2 * stripe; | |
91adb564 | 7400 | |
9f7c2220 N |
7401 | chunk_size = mddev->chunk_sectors << 9; |
7402 | blk_queue_io_min(mddev->queue, chunk_size); | |
7403 | blk_queue_io_opt(mddev->queue, chunk_size * | |
7404 | (conf->raid_disks - conf->max_degraded)); | |
c78afc62 | 7405 | mddev->queue->limits.raid_partial_stripes_expensive = 1; |
620125f2 SL |
7406 | /* |
7407 | * We can only discard a whole stripe. It doesn't make sense to | |
7408 | * discard data disk but write parity disk | |
7409 | */ | |
7410 | stripe = stripe * PAGE_SIZE; | |
4ac6875e N |
7411 | /* Round up to power of 2, as discard handling |
7412 | * currently assumes that */ | |
7413 | while ((stripe-1) & stripe) | |
7414 | stripe = (stripe | (stripe-1)) + 1; | |
620125f2 SL |
7415 | mddev->queue->limits.discard_alignment = stripe; |
7416 | mddev->queue->limits.discard_granularity = stripe; | |
e8d7c332 | 7417 | |
5026d7a9 | 7418 | blk_queue_max_write_same_sectors(mddev->queue, 0); |
3deff1a7 | 7419 | blk_queue_max_write_zeroes_sectors(mddev->queue, 0); |
5026d7a9 | 7420 | |
05616be5 | 7421 | rdev_for_each(rdev, mddev) { |
9f7c2220 N |
7422 | disk_stack_limits(mddev->gendisk, rdev->bdev, |
7423 | rdev->data_offset << 9); | |
05616be5 N |
7424 | disk_stack_limits(mddev->gendisk, rdev->bdev, |
7425 | rdev->new_data_offset << 9); | |
7426 | } | |
620125f2 | 7427 | |
48920ff2 CH |
7428 | /* |
7429 | * zeroing is required, otherwise data | |
7430 | * could be lost. Consider a scenario: discard a stripe | |
7431 | * (the stripe could be inconsistent if | |
7432 | * discard_zeroes_data is 0); write one disk of the | |
7433 | * stripe (the stripe could be inconsistent again | |
7434 | * depending on which disks are used to calculate | |
7435 | * parity); the disk is broken; The stripe data of this | |
7436 | * disk is lost. | |
7437 | * | |
7438 | * We only allow DISCARD if the sysadmin has confirmed that | |
7439 | * only safe devices are in use by setting a module parameter. | |
7440 | * A better idea might be to turn DISCARD into WRITE_ZEROES | |
7441 | * requests, as that is required to be safe. | |
7442 | */ | |
7443 | if (devices_handle_discard_safely && | |
e7597e69 JS |
7444 | mddev->queue->limits.max_discard_sectors >= (stripe >> 9) && |
7445 | mddev->queue->limits.discard_granularity >= stripe) | |
620125f2 SL |
7446 | queue_flag_set_unlocked(QUEUE_FLAG_DISCARD, |
7447 | mddev->queue); | |
7448 | else | |
7449 | queue_flag_clear_unlocked(QUEUE_FLAG_DISCARD, | |
7450 | mddev->queue); | |
1dffdddd SL |
7451 | |
7452 | blk_queue_max_hw_sectors(mddev->queue, UINT_MAX); | |
9f7c2220 | 7453 | } |
23032a0e | 7454 | |
845b9e22 | 7455 | if (log_init(conf, journal_dev, raid5_has_ppl(conf))) |
ff875738 | 7456 | goto abort; |
5c7e81c3 | 7457 | |
1da177e4 LT |
7458 | return 0; |
7459 | abort: | |
01f96c0a | 7460 | md_unregister_thread(&mddev->thread); |
e4f869d9 N |
7461 | print_raid5_conf(conf); |
7462 | free_conf(conf); | |
1da177e4 | 7463 | mddev->private = NULL; |
cc6167b4 | 7464 | pr_warn("md/raid:%s: failed to run raid set.\n", mdname(mddev)); |
1da177e4 LT |
7465 | return -EIO; |
7466 | } | |
7467 | ||
afa0f557 | 7468 | static void raid5_free(struct mddev *mddev, void *priv) |
1da177e4 | 7469 | { |
afa0f557 | 7470 | struct r5conf *conf = priv; |
1da177e4 | 7471 | |
95fc17aa | 7472 | free_conf(conf); |
a64c876f | 7473 | mddev->to_remove = &raid5_attrs_group; |
1da177e4 LT |
7474 | } |
7475 | ||
849674e4 | 7476 | static void raid5_status(struct seq_file *seq, struct mddev *mddev) |
1da177e4 | 7477 | { |
d1688a6d | 7478 | struct r5conf *conf = mddev->private; |
1da177e4 LT |
7479 | int i; |
7480 | ||
9d8f0363 | 7481 | seq_printf(seq, " level %d, %dk chunk, algorithm %d", mddev->level, |
3cb5edf4 | 7482 | conf->chunk_sectors / 2, mddev->layout); |
02c2de8c | 7483 | seq_printf (seq, " [%d/%d] [", conf->raid_disks, conf->raid_disks - mddev->degraded); |
5fd13351 N |
7484 | rcu_read_lock(); |
7485 | for (i = 0; i < conf->raid_disks; i++) { | |
7486 | struct md_rdev *rdev = rcu_dereference(conf->disks[i].rdev); | |
7487 | seq_printf (seq, "%s", rdev && test_bit(In_sync, &rdev->flags) ? "U" : "_"); | |
7488 | } | |
7489 | rcu_read_unlock(); | |
1da177e4 | 7490 | seq_printf (seq, "]"); |
1da177e4 LT |
7491 | } |
7492 | ||
d1688a6d | 7493 | static void print_raid5_conf (struct r5conf *conf) |
1da177e4 LT |
7494 | { |
7495 | int i; | |
7496 | struct disk_info *tmp; | |
7497 | ||
cc6167b4 | 7498 | pr_debug("RAID conf printout:\n"); |
1da177e4 | 7499 | if (!conf) { |
cc6167b4 | 7500 | pr_debug("(conf==NULL)\n"); |
1da177e4 LT |
7501 | return; |
7502 | } | |
cc6167b4 | 7503 | pr_debug(" --- level:%d rd:%d wd:%d\n", conf->level, |
0c55e022 N |
7504 | conf->raid_disks, |
7505 | conf->raid_disks - conf->mddev->degraded); | |
1da177e4 LT |
7506 | |
7507 | for (i = 0; i < conf->raid_disks; i++) { | |
7508 | char b[BDEVNAME_SIZE]; | |
7509 | tmp = conf->disks + i; | |
7510 | if (tmp->rdev) | |
cc6167b4 | 7511 | pr_debug(" disk %d, o:%d, dev:%s\n", |
0c55e022 N |
7512 | i, !test_bit(Faulty, &tmp->rdev->flags), |
7513 | bdevname(tmp->rdev->bdev, b)); | |
1da177e4 LT |
7514 | } |
7515 | } | |
7516 | ||
fd01b88c | 7517 | static int raid5_spare_active(struct mddev *mddev) |
1da177e4 LT |
7518 | { |
7519 | int i; | |
d1688a6d | 7520 | struct r5conf *conf = mddev->private; |
1da177e4 | 7521 | struct disk_info *tmp; |
6b965620 N |
7522 | int count = 0; |
7523 | unsigned long flags; | |
1da177e4 LT |
7524 | |
7525 | for (i = 0; i < conf->raid_disks; i++) { | |
7526 | tmp = conf->disks + i; | |
dd054fce N |
7527 | if (tmp->replacement |
7528 | && tmp->replacement->recovery_offset == MaxSector | |
7529 | && !test_bit(Faulty, &tmp->replacement->flags) | |
7530 | && !test_and_set_bit(In_sync, &tmp->replacement->flags)) { | |
7531 | /* Replacement has just become active. */ | |
7532 | if (!tmp->rdev | |
7533 | || !test_and_clear_bit(In_sync, &tmp->rdev->flags)) | |
7534 | count++; | |
7535 | if (tmp->rdev) { | |
7536 | /* Replaced device not technically faulty, | |
7537 | * but we need to be sure it gets removed | |
7538 | * and never re-added. | |
7539 | */ | |
7540 | set_bit(Faulty, &tmp->rdev->flags); | |
7541 | sysfs_notify_dirent_safe( | |
7542 | tmp->rdev->sysfs_state); | |
7543 | } | |
7544 | sysfs_notify_dirent_safe(tmp->replacement->sysfs_state); | |
7545 | } else if (tmp->rdev | |
70fffd0b | 7546 | && tmp->rdev->recovery_offset == MaxSector |
b2d444d7 | 7547 | && !test_bit(Faulty, &tmp->rdev->flags) |
c04be0aa | 7548 | && !test_and_set_bit(In_sync, &tmp->rdev->flags)) { |
6b965620 | 7549 | count++; |
43c73ca4 | 7550 | sysfs_notify_dirent_safe(tmp->rdev->sysfs_state); |
1da177e4 LT |
7551 | } |
7552 | } | |
6b965620 | 7553 | spin_lock_irqsave(&conf->device_lock, flags); |
2e38a37f | 7554 | mddev->degraded = raid5_calc_degraded(conf); |
6b965620 | 7555 | spin_unlock_irqrestore(&conf->device_lock, flags); |
1da177e4 | 7556 | print_raid5_conf(conf); |
6b965620 | 7557 | return count; |
1da177e4 LT |
7558 | } |
7559 | ||
b8321b68 | 7560 | static int raid5_remove_disk(struct mddev *mddev, struct md_rdev *rdev) |
1da177e4 | 7561 | { |
d1688a6d | 7562 | struct r5conf *conf = mddev->private; |
1da177e4 | 7563 | int err = 0; |
b8321b68 | 7564 | int number = rdev->raid_disk; |
657e3e4d | 7565 | struct md_rdev **rdevp; |
1da177e4 LT |
7566 | struct disk_info *p = conf->disks + number; |
7567 | ||
7568 | print_raid5_conf(conf); | |
f6b6ec5c | 7569 | if (test_bit(Journal, &rdev->flags) && conf->log) { |
c2bb6242 | 7570 | /* |
f6b6ec5c SL |
7571 | * we can't wait pending write here, as this is called in |
7572 | * raid5d, wait will deadlock. | |
84dd97a6 N |
7573 | * neilb: there is no locking about new writes here, |
7574 | * so this cannot be safe. | |
c2bb6242 | 7575 | */ |
70d466f7 SL |
7576 | if (atomic_read(&conf->active_stripes) || |
7577 | atomic_read(&conf->r5c_cached_full_stripes) || | |
7578 | atomic_read(&conf->r5c_cached_partial_stripes)) { | |
f6b6ec5c | 7579 | return -EBUSY; |
84dd97a6 | 7580 | } |
ff875738 | 7581 | log_exit(conf); |
f6b6ec5c | 7582 | return 0; |
c2bb6242 | 7583 | } |
657e3e4d N |
7584 | if (rdev == p->rdev) |
7585 | rdevp = &p->rdev; | |
7586 | else if (rdev == p->replacement) | |
7587 | rdevp = &p->replacement; | |
7588 | else | |
7589 | return 0; | |
7590 | ||
7591 | if (number >= conf->raid_disks && | |
7592 | conf->reshape_progress == MaxSector) | |
7593 | clear_bit(In_sync, &rdev->flags); | |
7594 | ||
7595 | if (test_bit(In_sync, &rdev->flags) || | |
7596 | atomic_read(&rdev->nr_pending)) { | |
7597 | err = -EBUSY; | |
7598 | goto abort; | |
7599 | } | |
7600 | /* Only remove non-faulty devices if recovery | |
7601 | * isn't possible. | |
7602 | */ | |
7603 | if (!test_bit(Faulty, &rdev->flags) && | |
7604 | mddev->recovery_disabled != conf->recovery_disabled && | |
7605 | !has_failed(conf) && | |
dd054fce | 7606 | (!p->replacement || p->replacement == rdev) && |
657e3e4d N |
7607 | number < conf->raid_disks) { |
7608 | err = -EBUSY; | |
7609 | goto abort; | |
7610 | } | |
7611 | *rdevp = NULL; | |
d787be40 N |
7612 | if (!test_bit(RemoveSynchronized, &rdev->flags)) { |
7613 | synchronize_rcu(); | |
7614 | if (atomic_read(&rdev->nr_pending)) { | |
7615 | /* lost the race, try later */ | |
7616 | err = -EBUSY; | |
7617 | *rdevp = rdev; | |
7618 | } | |
7619 | } | |
6358c239 AP |
7620 | if (!err) { |
7621 | err = log_modify(conf, rdev, false); | |
7622 | if (err) | |
7623 | goto abort; | |
7624 | } | |
d787be40 | 7625 | if (p->replacement) { |
dd054fce N |
7626 | /* We must have just cleared 'rdev' */ |
7627 | p->rdev = p->replacement; | |
7628 | clear_bit(Replacement, &p->replacement->flags); | |
7629 | smp_mb(); /* Make sure other CPUs may see both as identical | |
7630 | * but will never see neither - if they are careful | |
7631 | */ | |
7632 | p->replacement = NULL; | |
6358c239 AP |
7633 | |
7634 | if (!err) | |
7635 | err = log_modify(conf, p->rdev, true); | |
e5bc9c3c GJ |
7636 | } |
7637 | ||
7638 | clear_bit(WantReplacement, &rdev->flags); | |
1da177e4 LT |
7639 | abort: |
7640 | ||
7641 | print_raid5_conf(conf); | |
7642 | return err; | |
7643 | } | |
7644 | ||
fd01b88c | 7645 | static int raid5_add_disk(struct mddev *mddev, struct md_rdev *rdev) |
1da177e4 | 7646 | { |
d1688a6d | 7647 | struct r5conf *conf = mddev->private; |
199050ea | 7648 | int err = -EEXIST; |
1da177e4 LT |
7649 | int disk; |
7650 | struct disk_info *p; | |
6c2fce2e NB |
7651 | int first = 0; |
7652 | int last = conf->raid_disks - 1; | |
1da177e4 | 7653 | |
f6b6ec5c | 7654 | if (test_bit(Journal, &rdev->flags)) { |
f6b6ec5c SL |
7655 | if (conf->log) |
7656 | return -EBUSY; | |
7657 | ||
7658 | rdev->raid_disk = 0; | |
7659 | /* | |
7660 | * The array is in readonly mode if journal is missing, so no | |
7661 | * write requests running. We should be safe | |
7662 | */ | |
845b9e22 | 7663 | log_init(conf, rdev, false); |
f6b6ec5c SL |
7664 | return 0; |
7665 | } | |
7f0da59b N |
7666 | if (mddev->recovery_disabled == conf->recovery_disabled) |
7667 | return -EBUSY; | |
7668 | ||
dc10c643 | 7669 | if (rdev->saved_raid_disk < 0 && has_failed(conf)) |
1da177e4 | 7670 | /* no point adding a device */ |
199050ea | 7671 | return -EINVAL; |
1da177e4 | 7672 | |
6c2fce2e NB |
7673 | if (rdev->raid_disk >= 0) |
7674 | first = last = rdev->raid_disk; | |
1da177e4 LT |
7675 | |
7676 | /* | |
16a53ecc N |
7677 | * find the disk ... but prefer rdev->saved_raid_disk |
7678 | * if possible. | |
1da177e4 | 7679 | */ |
16a53ecc | 7680 | if (rdev->saved_raid_disk >= 0 && |
6c2fce2e | 7681 | rdev->saved_raid_disk >= first && |
16a53ecc | 7682 | conf->disks[rdev->saved_raid_disk].rdev == NULL) |
5cfb22a1 N |
7683 | first = rdev->saved_raid_disk; |
7684 | ||
7685 | for (disk = first; disk <= last; disk++) { | |
7bfec5f3 N |
7686 | p = conf->disks + disk; |
7687 | if (p->rdev == NULL) { | |
b2d444d7 | 7688 | clear_bit(In_sync, &rdev->flags); |
1da177e4 | 7689 | rdev->raid_disk = disk; |
72626685 N |
7690 | if (rdev->saved_raid_disk != disk) |
7691 | conf->fullsync = 1; | |
d6065f7b | 7692 | rcu_assign_pointer(p->rdev, rdev); |
6358c239 AP |
7693 | |
7694 | err = log_modify(conf, rdev, true); | |
7695 | ||
5cfb22a1 | 7696 | goto out; |
1da177e4 | 7697 | } |
5cfb22a1 N |
7698 | } |
7699 | for (disk = first; disk <= last; disk++) { | |
7700 | p = conf->disks + disk; | |
7bfec5f3 N |
7701 | if (test_bit(WantReplacement, &p->rdev->flags) && |
7702 | p->replacement == NULL) { | |
7703 | clear_bit(In_sync, &rdev->flags); | |
7704 | set_bit(Replacement, &rdev->flags); | |
7705 | rdev->raid_disk = disk; | |
7706 | err = 0; | |
7707 | conf->fullsync = 1; | |
7708 | rcu_assign_pointer(p->replacement, rdev); | |
7709 | break; | |
7710 | } | |
7711 | } | |
5cfb22a1 | 7712 | out: |
1da177e4 | 7713 | print_raid5_conf(conf); |
199050ea | 7714 | return err; |
1da177e4 LT |
7715 | } |
7716 | ||
fd01b88c | 7717 | static int raid5_resize(struct mddev *mddev, sector_t sectors) |
1da177e4 LT |
7718 | { |
7719 | /* no resync is happening, and there is enough space | |
7720 | * on all devices, so we can resize. | |
7721 | * We need to make sure resync covers any new space. | |
7722 | * If the array is shrinking we should possibly wait until | |
7723 | * any io in the removed space completes, but it hardly seems | |
7724 | * worth it. | |
7725 | */ | |
a4a6125a | 7726 | sector_t newsize; |
3cb5edf4 N |
7727 | struct r5conf *conf = mddev->private; |
7728 | ||
3418d036 | 7729 | if (conf->log || raid5_has_ppl(conf)) |
713cf5a6 | 7730 | return -EINVAL; |
3cb5edf4 | 7731 | sectors &= ~((sector_t)conf->chunk_sectors - 1); |
a4a6125a N |
7732 | newsize = raid5_size(mddev, sectors, mddev->raid_disks); |
7733 | if (mddev->external_size && | |
7734 | mddev->array_sectors > newsize) | |
b522adcd | 7735 | return -EINVAL; |
a4a6125a N |
7736 | if (mddev->bitmap) { |
7737 | int ret = bitmap_resize(mddev->bitmap, sectors, 0, 0); | |
7738 | if (ret) | |
7739 | return ret; | |
7740 | } | |
7741 | md_set_array_sectors(mddev, newsize); | |
b098636c N |
7742 | if (sectors > mddev->dev_sectors && |
7743 | mddev->recovery_cp > mddev->dev_sectors) { | |
58c0fed4 | 7744 | mddev->recovery_cp = mddev->dev_sectors; |
1da177e4 LT |
7745 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
7746 | } | |
58c0fed4 | 7747 | mddev->dev_sectors = sectors; |
4b5c7ae8 | 7748 | mddev->resync_max_sectors = sectors; |
1da177e4 LT |
7749 | return 0; |
7750 | } | |
7751 | ||
fd01b88c | 7752 | static int check_stripe_cache(struct mddev *mddev) |
01ee22b4 N |
7753 | { |
7754 | /* Can only proceed if there are plenty of stripe_heads. | |
7755 | * We need a minimum of one full stripe,, and for sensible progress | |
7756 | * it is best to have about 4 times that. | |
7757 | * If we require 4 times, then the default 256 4K stripe_heads will | |
7758 | * allow for chunk sizes up to 256K, which is probably OK. | |
7759 | * If the chunk size is greater, user-space should request more | |
7760 | * stripe_heads first. | |
7761 | */ | |
d1688a6d | 7762 | struct r5conf *conf = mddev->private; |
01ee22b4 | 7763 | if (((mddev->chunk_sectors << 9) / STRIPE_SIZE) * 4 |
edbe83ab | 7764 | > conf->min_nr_stripes || |
01ee22b4 | 7765 | ((mddev->new_chunk_sectors << 9) / STRIPE_SIZE) * 4 |
edbe83ab | 7766 | > conf->min_nr_stripes) { |
cc6167b4 N |
7767 | pr_warn("md/raid:%s: reshape: not enough stripes. Needed %lu\n", |
7768 | mdname(mddev), | |
7769 | ((max(mddev->chunk_sectors, mddev->new_chunk_sectors) << 9) | |
7770 | / STRIPE_SIZE)*4); | |
01ee22b4 N |
7771 | return 0; |
7772 | } | |
7773 | return 1; | |
7774 | } | |
7775 | ||
fd01b88c | 7776 | static int check_reshape(struct mddev *mddev) |
29269553 | 7777 | { |
d1688a6d | 7778 | struct r5conf *conf = mddev->private; |
29269553 | 7779 | |
3418d036 | 7780 | if (conf->log || raid5_has_ppl(conf)) |
713cf5a6 | 7781 | return -EINVAL; |
88ce4930 N |
7782 | if (mddev->delta_disks == 0 && |
7783 | mddev->new_layout == mddev->layout && | |
664e7c41 | 7784 | mddev->new_chunk_sectors == mddev->chunk_sectors) |
50ac168a | 7785 | return 0; /* nothing to do */ |
674806d6 | 7786 | if (has_failed(conf)) |
ec32a2bd | 7787 | return -EINVAL; |
fdcfbbb6 | 7788 | if (mddev->delta_disks < 0 && mddev->reshape_position == MaxSector) { |
ec32a2bd N |
7789 | /* We might be able to shrink, but the devices must |
7790 | * be made bigger first. | |
7791 | * For raid6, 4 is the minimum size. | |
7792 | * Otherwise 2 is the minimum | |
7793 | */ | |
7794 | int min = 2; | |
7795 | if (mddev->level == 6) | |
7796 | min = 4; | |
7797 | if (mddev->raid_disks + mddev->delta_disks < min) | |
7798 | return -EINVAL; | |
7799 | } | |
29269553 | 7800 | |
01ee22b4 | 7801 | if (!check_stripe_cache(mddev)) |
29269553 | 7802 | return -ENOSPC; |
29269553 | 7803 | |
738a2738 N |
7804 | if (mddev->new_chunk_sectors > mddev->chunk_sectors || |
7805 | mddev->delta_disks > 0) | |
7806 | if (resize_chunks(conf, | |
7807 | conf->previous_raid_disks | |
7808 | + max(0, mddev->delta_disks), | |
7809 | max(mddev->new_chunk_sectors, | |
7810 | mddev->chunk_sectors) | |
7811 | ) < 0) | |
7812 | return -ENOMEM; | |
845b9e22 AP |
7813 | |
7814 | if (conf->previous_raid_disks + mddev->delta_disks <= conf->pool_size) | |
7815 | return 0; /* never bother to shrink */ | |
e56108d6 N |
7816 | return resize_stripes(conf, (conf->previous_raid_disks |
7817 | + mddev->delta_disks)); | |
63c70c4f N |
7818 | } |
7819 | ||
fd01b88c | 7820 | static int raid5_start_reshape(struct mddev *mddev) |
63c70c4f | 7821 | { |
d1688a6d | 7822 | struct r5conf *conf = mddev->private; |
3cb03002 | 7823 | struct md_rdev *rdev; |
63c70c4f | 7824 | int spares = 0; |
c04be0aa | 7825 | unsigned long flags; |
63c70c4f | 7826 | |
f416885e | 7827 | if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) |
63c70c4f N |
7828 | return -EBUSY; |
7829 | ||
01ee22b4 N |
7830 | if (!check_stripe_cache(mddev)) |
7831 | return -ENOSPC; | |
7832 | ||
30b67645 N |
7833 | if (has_failed(conf)) |
7834 | return -EINVAL; | |
7835 | ||
c6563a8c | 7836 | rdev_for_each(rdev, mddev) { |
469518a3 N |
7837 | if (!test_bit(In_sync, &rdev->flags) |
7838 | && !test_bit(Faulty, &rdev->flags)) | |
29269553 | 7839 | spares++; |
c6563a8c | 7840 | } |
63c70c4f | 7841 | |
f416885e | 7842 | if (spares - mddev->degraded < mddev->delta_disks - conf->max_degraded) |
29269553 N |
7843 | /* Not enough devices even to make a degraded array |
7844 | * of that size | |
7845 | */ | |
7846 | return -EINVAL; | |
7847 | ||
ec32a2bd N |
7848 | /* Refuse to reduce size of the array. Any reductions in |
7849 | * array size must be through explicit setting of array_size | |
7850 | * attribute. | |
7851 | */ | |
7852 | if (raid5_size(mddev, 0, conf->raid_disks + mddev->delta_disks) | |
7853 | < mddev->array_sectors) { | |
cc6167b4 N |
7854 | pr_warn("md/raid:%s: array size must be reduced before number of disks\n", |
7855 | mdname(mddev)); | |
ec32a2bd N |
7856 | return -EINVAL; |
7857 | } | |
7858 | ||
f6705578 | 7859 | atomic_set(&conf->reshape_stripes, 0); |
29269553 | 7860 | spin_lock_irq(&conf->device_lock); |
c46501b2 | 7861 | write_seqcount_begin(&conf->gen_lock); |
29269553 | 7862 | conf->previous_raid_disks = conf->raid_disks; |
63c70c4f | 7863 | conf->raid_disks += mddev->delta_disks; |
09c9e5fa AN |
7864 | conf->prev_chunk_sectors = conf->chunk_sectors; |
7865 | conf->chunk_sectors = mddev->new_chunk_sectors; | |
88ce4930 N |
7866 | conf->prev_algo = conf->algorithm; |
7867 | conf->algorithm = mddev->new_layout; | |
05616be5 N |
7868 | conf->generation++; |
7869 | /* Code that selects data_offset needs to see the generation update | |
7870 | * if reshape_progress has been set - so a memory barrier needed. | |
7871 | */ | |
7872 | smp_mb(); | |
2c810cdd | 7873 | if (mddev->reshape_backwards) |
fef9c61f N |
7874 | conf->reshape_progress = raid5_size(mddev, 0, 0); |
7875 | else | |
7876 | conf->reshape_progress = 0; | |
7877 | conf->reshape_safe = conf->reshape_progress; | |
c46501b2 | 7878 | write_seqcount_end(&conf->gen_lock); |
29269553 N |
7879 | spin_unlock_irq(&conf->device_lock); |
7880 | ||
4d77e3ba N |
7881 | /* Now make sure any requests that proceeded on the assumption |
7882 | * the reshape wasn't running - like Discard or Read - have | |
7883 | * completed. | |
7884 | */ | |
7885 | mddev_suspend(mddev); | |
7886 | mddev_resume(mddev); | |
7887 | ||
29269553 N |
7888 | /* Add some new drives, as many as will fit. |
7889 | * We know there are enough to make the newly sized array work. | |
3424bf6a N |
7890 | * Don't add devices if we are reducing the number of |
7891 | * devices in the array. This is because it is not possible | |
7892 | * to correctly record the "partially reconstructed" state of | |
7893 | * such devices during the reshape and confusion could result. | |
29269553 | 7894 | */ |
87a8dec9 | 7895 | if (mddev->delta_disks >= 0) { |
dafb20fa | 7896 | rdev_for_each(rdev, mddev) |
87a8dec9 N |
7897 | if (rdev->raid_disk < 0 && |
7898 | !test_bit(Faulty, &rdev->flags)) { | |
7899 | if (raid5_add_disk(mddev, rdev) == 0) { | |
87a8dec9 | 7900 | if (rdev->raid_disk |
9d4c7d87 | 7901 | >= conf->previous_raid_disks) |
87a8dec9 | 7902 | set_bit(In_sync, &rdev->flags); |
9d4c7d87 | 7903 | else |
87a8dec9 | 7904 | rdev->recovery_offset = 0; |
36fad858 NK |
7905 | |
7906 | if (sysfs_link_rdev(mddev, rdev)) | |
87a8dec9 | 7907 | /* Failure here is OK */; |
50da0840 | 7908 | } |
87a8dec9 N |
7909 | } else if (rdev->raid_disk >= conf->previous_raid_disks |
7910 | && !test_bit(Faulty, &rdev->flags)) { | |
7911 | /* This is a spare that was manually added */ | |
7912 | set_bit(In_sync, &rdev->flags); | |
87a8dec9 | 7913 | } |
29269553 | 7914 | |
87a8dec9 N |
7915 | /* When a reshape changes the number of devices, |
7916 | * ->degraded is measured against the larger of the | |
7917 | * pre and post number of devices. | |
7918 | */ | |
ec32a2bd | 7919 | spin_lock_irqsave(&conf->device_lock, flags); |
2e38a37f | 7920 | mddev->degraded = raid5_calc_degraded(conf); |
ec32a2bd N |
7921 | spin_unlock_irqrestore(&conf->device_lock, flags); |
7922 | } | |
63c70c4f | 7923 | mddev->raid_disks = conf->raid_disks; |
e516402c | 7924 | mddev->reshape_position = conf->reshape_progress; |
2953079c | 7925 | set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags); |
f6705578 | 7926 | |
29269553 N |
7927 | clear_bit(MD_RECOVERY_SYNC, &mddev->recovery); |
7928 | clear_bit(MD_RECOVERY_CHECK, &mddev->recovery); | |
ea358cd0 | 7929 | clear_bit(MD_RECOVERY_DONE, &mddev->recovery); |
29269553 N |
7930 | set_bit(MD_RECOVERY_RESHAPE, &mddev->recovery); |
7931 | set_bit(MD_RECOVERY_RUNNING, &mddev->recovery); | |
7932 | mddev->sync_thread = md_register_thread(md_do_sync, mddev, | |
0da3c619 | 7933 | "reshape"); |
29269553 N |
7934 | if (!mddev->sync_thread) { |
7935 | mddev->recovery = 0; | |
7936 | spin_lock_irq(&conf->device_lock); | |
ba8805b9 | 7937 | write_seqcount_begin(&conf->gen_lock); |
29269553 | 7938 | mddev->raid_disks = conf->raid_disks = conf->previous_raid_disks; |
ba8805b9 N |
7939 | mddev->new_chunk_sectors = |
7940 | conf->chunk_sectors = conf->prev_chunk_sectors; | |
7941 | mddev->new_layout = conf->algorithm = conf->prev_algo; | |
05616be5 N |
7942 | rdev_for_each(rdev, mddev) |
7943 | rdev->new_data_offset = rdev->data_offset; | |
7944 | smp_wmb(); | |
ba8805b9 | 7945 | conf->generation --; |
fef9c61f | 7946 | conf->reshape_progress = MaxSector; |
1e3fa9bd | 7947 | mddev->reshape_position = MaxSector; |
ba8805b9 | 7948 | write_seqcount_end(&conf->gen_lock); |
29269553 N |
7949 | spin_unlock_irq(&conf->device_lock); |
7950 | return -EAGAIN; | |
7951 | } | |
c8f517c4 | 7952 | conf->reshape_checkpoint = jiffies; |
29269553 N |
7953 | md_wakeup_thread(mddev->sync_thread); |
7954 | md_new_event(mddev); | |
7955 | return 0; | |
7956 | } | |
29269553 | 7957 | |
ec32a2bd N |
7958 | /* This is called from the reshape thread and should make any |
7959 | * changes needed in 'conf' | |
7960 | */ | |
d1688a6d | 7961 | static void end_reshape(struct r5conf *conf) |
29269553 | 7962 | { |
29269553 | 7963 | |
f6705578 | 7964 | if (!test_bit(MD_RECOVERY_INTR, &conf->mddev->recovery)) { |
db0505d3 | 7965 | struct md_rdev *rdev; |
f6705578 | 7966 | |
f6705578 | 7967 | spin_lock_irq(&conf->device_lock); |
cea9c228 | 7968 | conf->previous_raid_disks = conf->raid_disks; |
b5d27718 | 7969 | md_finish_reshape(conf->mddev); |
05616be5 | 7970 | smp_wmb(); |
fef9c61f | 7971 | conf->reshape_progress = MaxSector; |
6cbd8148 | 7972 | conf->mddev->reshape_position = MaxSector; |
db0505d3 N |
7973 | rdev_for_each(rdev, conf->mddev) |
7974 | if (rdev->raid_disk >= 0 && | |
7975 | !test_bit(Journal, &rdev->flags) && | |
7976 | !test_bit(In_sync, &rdev->flags)) | |
7977 | rdev->recovery_offset = MaxSector; | |
f6705578 | 7978 | spin_unlock_irq(&conf->device_lock); |
b0f9ec04 | 7979 | wake_up(&conf->wait_for_overlap); |
16a53ecc N |
7980 | |
7981 | /* read-ahead size must cover two whole stripes, which is | |
7982 | * 2 * (datadisks) * chunksize where 'n' is the number of raid devices | |
7983 | */ | |
4a5add49 | 7984 | if (conf->mddev->queue) { |
cea9c228 | 7985 | int data_disks = conf->raid_disks - conf->max_degraded; |
09c9e5fa | 7986 | int stripe = data_disks * ((conf->chunk_sectors << 9) |
cea9c228 | 7987 | / PAGE_SIZE); |
dc3b17cc JK |
7988 | if (conf->mddev->queue->backing_dev_info->ra_pages < 2 * stripe) |
7989 | conf->mddev->queue->backing_dev_info->ra_pages = 2 * stripe; | |
16a53ecc | 7990 | } |
29269553 | 7991 | } |
29269553 N |
7992 | } |
7993 | ||
ec32a2bd N |
7994 | /* This is called from the raid5d thread with mddev_lock held. |
7995 | * It makes config changes to the device. | |
7996 | */ | |
fd01b88c | 7997 | static void raid5_finish_reshape(struct mddev *mddev) |
cea9c228 | 7998 | { |
d1688a6d | 7999 | struct r5conf *conf = mddev->private; |
cea9c228 N |
8000 | |
8001 | if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery)) { | |
8002 | ||
8876391e | 8003 | if (mddev->delta_disks <= 0) { |
ec32a2bd | 8004 | int d; |
908f4fbd | 8005 | spin_lock_irq(&conf->device_lock); |
2e38a37f | 8006 | mddev->degraded = raid5_calc_degraded(conf); |
908f4fbd | 8007 | spin_unlock_irq(&conf->device_lock); |
ec32a2bd N |
8008 | for (d = conf->raid_disks ; |
8009 | d < conf->raid_disks - mddev->delta_disks; | |
1a67dde0 | 8010 | d++) { |
3cb03002 | 8011 | struct md_rdev *rdev = conf->disks[d].rdev; |
da7613b8 N |
8012 | if (rdev) |
8013 | clear_bit(In_sync, &rdev->flags); | |
8014 | rdev = conf->disks[d].replacement; | |
8015 | if (rdev) | |
8016 | clear_bit(In_sync, &rdev->flags); | |
1a67dde0 | 8017 | } |
cea9c228 | 8018 | } |
88ce4930 | 8019 | mddev->layout = conf->algorithm; |
09c9e5fa | 8020 | mddev->chunk_sectors = conf->chunk_sectors; |
ec32a2bd N |
8021 | mddev->reshape_position = MaxSector; |
8022 | mddev->delta_disks = 0; | |
2c810cdd | 8023 | mddev->reshape_backwards = 0; |
cea9c228 N |
8024 | } |
8025 | } | |
8026 | ||
b03e0ccb | 8027 | static void raid5_quiesce(struct mddev *mddev, int quiesce) |
72626685 | 8028 | { |
d1688a6d | 8029 | struct r5conf *conf = mddev->private; |
72626685 | 8030 | |
b03e0ccb N |
8031 | if (quiesce) { |
8032 | /* stop all writes */ | |
566c09c5 | 8033 | lock_all_device_hash_locks_irq(conf); |
64bd660b N |
8034 | /* '2' tells resync/reshape to pause so that all |
8035 | * active stripes can drain | |
8036 | */ | |
a39f7afd | 8037 | r5c_flush_cache(conf, INT_MAX); |
64bd660b | 8038 | conf->quiesce = 2; |
b1b46486 | 8039 | wait_event_cmd(conf->wait_for_quiescent, |
46031f9a RBJ |
8040 | atomic_read(&conf->active_stripes) == 0 && |
8041 | atomic_read(&conf->active_aligned_reads) == 0, | |
566c09c5 SL |
8042 | unlock_all_device_hash_locks_irq(conf), |
8043 | lock_all_device_hash_locks_irq(conf)); | |
64bd660b | 8044 | conf->quiesce = 1; |
566c09c5 | 8045 | unlock_all_device_hash_locks_irq(conf); |
64bd660b N |
8046 | /* allow reshape to continue */ |
8047 | wake_up(&conf->wait_for_overlap); | |
b03e0ccb N |
8048 | } else { |
8049 | /* re-enable writes */ | |
566c09c5 | 8050 | lock_all_device_hash_locks_irq(conf); |
72626685 | 8051 | conf->quiesce = 0; |
b1b46486 | 8052 | wake_up(&conf->wait_for_quiescent); |
e464eafd | 8053 | wake_up(&conf->wait_for_overlap); |
566c09c5 | 8054 | unlock_all_device_hash_locks_irq(conf); |
72626685 | 8055 | } |
1532d9e8 | 8056 | log_quiesce(conf, quiesce); |
72626685 | 8057 | } |
b15c2e57 | 8058 | |
fd01b88c | 8059 | static void *raid45_takeover_raid0(struct mddev *mddev, int level) |
54071b38 | 8060 | { |
e373ab10 | 8061 | struct r0conf *raid0_conf = mddev->private; |
d76c8420 | 8062 | sector_t sectors; |
54071b38 | 8063 | |
f1b29bca | 8064 | /* for raid0 takeover only one zone is supported */ |
e373ab10 | 8065 | if (raid0_conf->nr_strip_zones > 1) { |
cc6167b4 N |
8066 | pr_warn("md/raid:%s: cannot takeover raid0 with more than one zone.\n", |
8067 | mdname(mddev)); | |
f1b29bca DW |
8068 | return ERR_PTR(-EINVAL); |
8069 | } | |
8070 | ||
e373ab10 N |
8071 | sectors = raid0_conf->strip_zone[0].zone_end; |
8072 | sector_div(sectors, raid0_conf->strip_zone[0].nb_dev); | |
3b71bd93 | 8073 | mddev->dev_sectors = sectors; |
f1b29bca | 8074 | mddev->new_level = level; |
54071b38 TM |
8075 | mddev->new_layout = ALGORITHM_PARITY_N; |
8076 | mddev->new_chunk_sectors = mddev->chunk_sectors; | |
8077 | mddev->raid_disks += 1; | |
8078 | mddev->delta_disks = 1; | |
8079 | /* make sure it will be not marked as dirty */ | |
8080 | mddev->recovery_cp = MaxSector; | |
8081 | ||
8082 | return setup_conf(mddev); | |
8083 | } | |
8084 | ||
fd01b88c | 8085 | static void *raid5_takeover_raid1(struct mddev *mddev) |
d562b0c4 N |
8086 | { |
8087 | int chunksect; | |
6995f0b2 | 8088 | void *ret; |
d562b0c4 N |
8089 | |
8090 | if (mddev->raid_disks != 2 || | |
8091 | mddev->degraded > 1) | |
8092 | return ERR_PTR(-EINVAL); | |
8093 | ||
8094 | /* Should check if there are write-behind devices? */ | |
8095 | ||
8096 | chunksect = 64*2; /* 64K by default */ | |
8097 | ||
8098 | /* The array must be an exact multiple of chunksize */ | |
8099 | while (chunksect && (mddev->array_sectors & (chunksect-1))) | |
8100 | chunksect >>= 1; | |
8101 | ||
8102 | if ((chunksect<<9) < STRIPE_SIZE) | |
8103 | /* array size does not allow a suitable chunk size */ | |
8104 | return ERR_PTR(-EINVAL); | |
8105 | ||
8106 | mddev->new_level = 5; | |
8107 | mddev->new_layout = ALGORITHM_LEFT_SYMMETRIC; | |
664e7c41 | 8108 | mddev->new_chunk_sectors = chunksect; |
d562b0c4 | 8109 | |
6995f0b2 | 8110 | ret = setup_conf(mddev); |
32cd7cbb | 8111 | if (!IS_ERR(ret)) |
394ed8e4 SL |
8112 | mddev_clear_unsupported_flags(mddev, |
8113 | UNSUPPORTED_MDDEV_FLAGS); | |
6995f0b2 | 8114 | return ret; |
d562b0c4 N |
8115 | } |
8116 | ||
fd01b88c | 8117 | static void *raid5_takeover_raid6(struct mddev *mddev) |
fc9739c6 N |
8118 | { |
8119 | int new_layout; | |
8120 | ||
8121 | switch (mddev->layout) { | |
8122 | case ALGORITHM_LEFT_ASYMMETRIC_6: | |
8123 | new_layout = ALGORITHM_LEFT_ASYMMETRIC; | |
8124 | break; | |
8125 | case ALGORITHM_RIGHT_ASYMMETRIC_6: | |
8126 | new_layout = ALGORITHM_RIGHT_ASYMMETRIC; | |
8127 | break; | |
8128 | case ALGORITHM_LEFT_SYMMETRIC_6: | |
8129 | new_layout = ALGORITHM_LEFT_SYMMETRIC; | |
8130 | break; | |
8131 | case ALGORITHM_RIGHT_SYMMETRIC_6: | |
8132 | new_layout = ALGORITHM_RIGHT_SYMMETRIC; | |
8133 | break; | |
8134 | case ALGORITHM_PARITY_0_6: | |
8135 | new_layout = ALGORITHM_PARITY_0; | |
8136 | break; | |
8137 | case ALGORITHM_PARITY_N: | |
8138 | new_layout = ALGORITHM_PARITY_N; | |
8139 | break; | |
8140 | default: | |
8141 | return ERR_PTR(-EINVAL); | |
8142 | } | |
8143 | mddev->new_level = 5; | |
8144 | mddev->new_layout = new_layout; | |
8145 | mddev->delta_disks = -1; | |
8146 | mddev->raid_disks -= 1; | |
8147 | return setup_conf(mddev); | |
8148 | } | |
8149 | ||
fd01b88c | 8150 | static int raid5_check_reshape(struct mddev *mddev) |
b3546035 | 8151 | { |
88ce4930 N |
8152 | /* For a 2-drive array, the layout and chunk size can be changed |
8153 | * immediately as not restriping is needed. | |
8154 | * For larger arrays we record the new value - after validation | |
8155 | * to be used by a reshape pass. | |
b3546035 | 8156 | */ |
d1688a6d | 8157 | struct r5conf *conf = mddev->private; |
597a711b | 8158 | int new_chunk = mddev->new_chunk_sectors; |
b3546035 | 8159 | |
597a711b | 8160 | if (mddev->new_layout >= 0 && !algorithm_valid_raid5(mddev->new_layout)) |
b3546035 N |
8161 | return -EINVAL; |
8162 | if (new_chunk > 0) { | |
0ba459d2 | 8163 | if (!is_power_of_2(new_chunk)) |
b3546035 | 8164 | return -EINVAL; |
597a711b | 8165 | if (new_chunk < (PAGE_SIZE>>9)) |
b3546035 | 8166 | return -EINVAL; |
597a711b | 8167 | if (mddev->array_sectors & (new_chunk-1)) |
b3546035 N |
8168 | /* not factor of array size */ |
8169 | return -EINVAL; | |
8170 | } | |
8171 | ||
8172 | /* They look valid */ | |
8173 | ||
88ce4930 | 8174 | if (mddev->raid_disks == 2) { |
597a711b N |
8175 | /* can make the change immediately */ |
8176 | if (mddev->new_layout >= 0) { | |
8177 | conf->algorithm = mddev->new_layout; | |
8178 | mddev->layout = mddev->new_layout; | |
88ce4930 N |
8179 | } |
8180 | if (new_chunk > 0) { | |
597a711b N |
8181 | conf->chunk_sectors = new_chunk ; |
8182 | mddev->chunk_sectors = new_chunk; | |
88ce4930 | 8183 | } |
2953079c | 8184 | set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags); |
88ce4930 | 8185 | md_wakeup_thread(mddev->thread); |
b3546035 | 8186 | } |
50ac168a | 8187 | return check_reshape(mddev); |
88ce4930 N |
8188 | } |
8189 | ||
fd01b88c | 8190 | static int raid6_check_reshape(struct mddev *mddev) |
88ce4930 | 8191 | { |
597a711b | 8192 | int new_chunk = mddev->new_chunk_sectors; |
50ac168a | 8193 | |
597a711b | 8194 | if (mddev->new_layout >= 0 && !algorithm_valid_raid6(mddev->new_layout)) |
88ce4930 | 8195 | return -EINVAL; |
b3546035 | 8196 | if (new_chunk > 0) { |
0ba459d2 | 8197 | if (!is_power_of_2(new_chunk)) |
88ce4930 | 8198 | return -EINVAL; |
597a711b | 8199 | if (new_chunk < (PAGE_SIZE >> 9)) |
88ce4930 | 8200 | return -EINVAL; |
597a711b | 8201 | if (mddev->array_sectors & (new_chunk-1)) |
88ce4930 N |
8202 | /* not factor of array size */ |
8203 | return -EINVAL; | |
b3546035 | 8204 | } |
88ce4930 N |
8205 | |
8206 | /* They look valid */ | |
50ac168a | 8207 | return check_reshape(mddev); |
b3546035 N |
8208 | } |
8209 | ||
fd01b88c | 8210 | static void *raid5_takeover(struct mddev *mddev) |
d562b0c4 N |
8211 | { |
8212 | /* raid5 can take over: | |
f1b29bca | 8213 | * raid0 - if there is only one strip zone - make it a raid4 layout |
d562b0c4 N |
8214 | * raid1 - if there are two drives. We need to know the chunk size |
8215 | * raid4 - trivial - just use a raid4 layout. | |
8216 | * raid6 - Providing it is a *_6 layout | |
d562b0c4 | 8217 | */ |
f1b29bca DW |
8218 | if (mddev->level == 0) |
8219 | return raid45_takeover_raid0(mddev, 5); | |
d562b0c4 N |
8220 | if (mddev->level == 1) |
8221 | return raid5_takeover_raid1(mddev); | |
e9d4758f N |
8222 | if (mddev->level == 4) { |
8223 | mddev->new_layout = ALGORITHM_PARITY_N; | |
8224 | mddev->new_level = 5; | |
8225 | return setup_conf(mddev); | |
8226 | } | |
fc9739c6 N |
8227 | if (mddev->level == 6) |
8228 | return raid5_takeover_raid6(mddev); | |
d562b0c4 N |
8229 | |
8230 | return ERR_PTR(-EINVAL); | |
8231 | } | |
8232 | ||
fd01b88c | 8233 | static void *raid4_takeover(struct mddev *mddev) |
a78d38a1 | 8234 | { |
f1b29bca DW |
8235 | /* raid4 can take over: |
8236 | * raid0 - if there is only one strip zone | |
8237 | * raid5 - if layout is right | |
a78d38a1 | 8238 | */ |
f1b29bca DW |
8239 | if (mddev->level == 0) |
8240 | return raid45_takeover_raid0(mddev, 4); | |
a78d38a1 N |
8241 | if (mddev->level == 5 && |
8242 | mddev->layout == ALGORITHM_PARITY_N) { | |
8243 | mddev->new_layout = 0; | |
8244 | mddev->new_level = 4; | |
8245 | return setup_conf(mddev); | |
8246 | } | |
8247 | return ERR_PTR(-EINVAL); | |
8248 | } | |
d562b0c4 | 8249 | |
84fc4b56 | 8250 | static struct md_personality raid5_personality; |
245f46c2 | 8251 | |
fd01b88c | 8252 | static void *raid6_takeover(struct mddev *mddev) |
245f46c2 N |
8253 | { |
8254 | /* Currently can only take over a raid5. We map the | |
8255 | * personality to an equivalent raid6 personality | |
8256 | * with the Q block at the end. | |
8257 | */ | |
8258 | int new_layout; | |
8259 | ||
8260 | if (mddev->pers != &raid5_personality) | |
8261 | return ERR_PTR(-EINVAL); | |
8262 | if (mddev->degraded > 1) | |
8263 | return ERR_PTR(-EINVAL); | |
8264 | if (mddev->raid_disks > 253) | |
8265 | return ERR_PTR(-EINVAL); | |
8266 | if (mddev->raid_disks < 3) | |
8267 | return ERR_PTR(-EINVAL); | |
8268 | ||
8269 | switch (mddev->layout) { | |
8270 | case ALGORITHM_LEFT_ASYMMETRIC: | |
8271 | new_layout = ALGORITHM_LEFT_ASYMMETRIC_6; | |
8272 | break; | |
8273 | case ALGORITHM_RIGHT_ASYMMETRIC: | |
8274 | new_layout = ALGORITHM_RIGHT_ASYMMETRIC_6; | |
8275 | break; | |
8276 | case ALGORITHM_LEFT_SYMMETRIC: | |
8277 | new_layout = ALGORITHM_LEFT_SYMMETRIC_6; | |
8278 | break; | |
8279 | case ALGORITHM_RIGHT_SYMMETRIC: | |
8280 | new_layout = ALGORITHM_RIGHT_SYMMETRIC_6; | |
8281 | break; | |
8282 | case ALGORITHM_PARITY_0: | |
8283 | new_layout = ALGORITHM_PARITY_0_6; | |
8284 | break; | |
8285 | case ALGORITHM_PARITY_N: | |
8286 | new_layout = ALGORITHM_PARITY_N; | |
8287 | break; | |
8288 | default: | |
8289 | return ERR_PTR(-EINVAL); | |
8290 | } | |
8291 | mddev->new_level = 6; | |
8292 | mddev->new_layout = new_layout; | |
8293 | mddev->delta_disks = 1; | |
8294 | mddev->raid_disks += 1; | |
8295 | return setup_conf(mddev); | |
8296 | } | |
8297 | ||
ba903a3e AP |
8298 | static int raid5_change_consistency_policy(struct mddev *mddev, const char *buf) |
8299 | { | |
8300 | struct r5conf *conf; | |
8301 | int err; | |
8302 | ||
8303 | err = mddev_lock(mddev); | |
8304 | if (err) | |
8305 | return err; | |
8306 | conf = mddev->private; | |
8307 | if (!conf) { | |
8308 | mddev_unlock(mddev); | |
8309 | return -ENODEV; | |
8310 | } | |
8311 | ||
845b9e22 | 8312 | if (strncmp(buf, "ppl", 3) == 0) { |
0bb0c105 | 8313 | /* ppl only works with RAID 5 */ |
845b9e22 AP |
8314 | if (!raid5_has_ppl(conf) && conf->level == 5) { |
8315 | err = log_init(conf, NULL, true); | |
8316 | if (!err) { | |
8317 | err = resize_stripes(conf, conf->pool_size); | |
8318 | if (err) | |
8319 | log_exit(conf); | |
8320 | } | |
0bb0c105 SL |
8321 | } else |
8322 | err = -EINVAL; | |
8323 | } else if (strncmp(buf, "resync", 6) == 0) { | |
8324 | if (raid5_has_ppl(conf)) { | |
8325 | mddev_suspend(mddev); | |
8326 | log_exit(conf); | |
0bb0c105 | 8327 | mddev_resume(mddev); |
845b9e22 | 8328 | err = resize_stripes(conf, conf->pool_size); |
0bb0c105 SL |
8329 | } else if (test_bit(MD_HAS_JOURNAL, &conf->mddev->flags) && |
8330 | r5l_log_disk_error(conf)) { | |
8331 | bool journal_dev_exists = false; | |
8332 | struct md_rdev *rdev; | |
8333 | ||
8334 | rdev_for_each(rdev, mddev) | |
8335 | if (test_bit(Journal, &rdev->flags)) { | |
8336 | journal_dev_exists = true; | |
8337 | break; | |
8338 | } | |
8339 | ||
8340 | if (!journal_dev_exists) { | |
8341 | mddev_suspend(mddev); | |
8342 | clear_bit(MD_HAS_JOURNAL, &mddev->flags); | |
8343 | mddev_resume(mddev); | |
8344 | } else /* need remove journal device first */ | |
8345 | err = -EBUSY; | |
8346 | } else | |
8347 | err = -EINVAL; | |
ba903a3e AP |
8348 | } else { |
8349 | err = -EINVAL; | |
8350 | } | |
8351 | ||
8352 | if (!err) | |
8353 | md_update_sb(mddev, 1); | |
8354 | ||
8355 | mddev_unlock(mddev); | |
8356 | ||
8357 | return err; | |
8358 | } | |
8359 | ||
d5d885fd SL |
8360 | static int raid5_start(struct mddev *mddev) |
8361 | { | |
8362 | struct r5conf *conf = mddev->private; | |
8363 | ||
8364 | return r5l_start(conf->log); | |
8365 | } | |
8366 | ||
84fc4b56 | 8367 | static struct md_personality raid6_personality = |
16a53ecc N |
8368 | { |
8369 | .name = "raid6", | |
8370 | .level = 6, | |
8371 | .owner = THIS_MODULE, | |
849674e4 SL |
8372 | .make_request = raid5_make_request, |
8373 | .run = raid5_run, | |
d5d885fd | 8374 | .start = raid5_start, |
afa0f557 | 8375 | .free = raid5_free, |
849674e4 SL |
8376 | .status = raid5_status, |
8377 | .error_handler = raid5_error, | |
16a53ecc N |
8378 | .hot_add_disk = raid5_add_disk, |
8379 | .hot_remove_disk= raid5_remove_disk, | |
8380 | .spare_active = raid5_spare_active, | |
849674e4 | 8381 | .sync_request = raid5_sync_request, |
16a53ecc | 8382 | .resize = raid5_resize, |
80c3a6ce | 8383 | .size = raid5_size, |
50ac168a | 8384 | .check_reshape = raid6_check_reshape, |
f416885e | 8385 | .start_reshape = raid5_start_reshape, |
cea9c228 | 8386 | .finish_reshape = raid5_finish_reshape, |
16a53ecc | 8387 | .quiesce = raid5_quiesce, |
245f46c2 | 8388 | .takeover = raid6_takeover, |
5c675f83 | 8389 | .congested = raid5_congested, |
0bb0c105 | 8390 | .change_consistency_policy = raid5_change_consistency_policy, |
16a53ecc | 8391 | }; |
84fc4b56 | 8392 | static struct md_personality raid5_personality = |
1da177e4 LT |
8393 | { |
8394 | .name = "raid5", | |
2604b703 | 8395 | .level = 5, |
1da177e4 | 8396 | .owner = THIS_MODULE, |
849674e4 SL |
8397 | .make_request = raid5_make_request, |
8398 | .run = raid5_run, | |
d5d885fd | 8399 | .start = raid5_start, |
afa0f557 | 8400 | .free = raid5_free, |
849674e4 SL |
8401 | .status = raid5_status, |
8402 | .error_handler = raid5_error, | |
1da177e4 LT |
8403 | .hot_add_disk = raid5_add_disk, |
8404 | .hot_remove_disk= raid5_remove_disk, | |
8405 | .spare_active = raid5_spare_active, | |
849674e4 | 8406 | .sync_request = raid5_sync_request, |
1da177e4 | 8407 | .resize = raid5_resize, |
80c3a6ce | 8408 | .size = raid5_size, |
63c70c4f N |
8409 | .check_reshape = raid5_check_reshape, |
8410 | .start_reshape = raid5_start_reshape, | |
cea9c228 | 8411 | .finish_reshape = raid5_finish_reshape, |
72626685 | 8412 | .quiesce = raid5_quiesce, |
d562b0c4 | 8413 | .takeover = raid5_takeover, |
5c675f83 | 8414 | .congested = raid5_congested, |
ba903a3e | 8415 | .change_consistency_policy = raid5_change_consistency_policy, |
1da177e4 LT |
8416 | }; |
8417 | ||
84fc4b56 | 8418 | static struct md_personality raid4_personality = |
1da177e4 | 8419 | { |
2604b703 N |
8420 | .name = "raid4", |
8421 | .level = 4, | |
8422 | .owner = THIS_MODULE, | |
849674e4 SL |
8423 | .make_request = raid5_make_request, |
8424 | .run = raid5_run, | |
d5d885fd | 8425 | .start = raid5_start, |
afa0f557 | 8426 | .free = raid5_free, |
849674e4 SL |
8427 | .status = raid5_status, |
8428 | .error_handler = raid5_error, | |
2604b703 N |
8429 | .hot_add_disk = raid5_add_disk, |
8430 | .hot_remove_disk= raid5_remove_disk, | |
8431 | .spare_active = raid5_spare_active, | |
849674e4 | 8432 | .sync_request = raid5_sync_request, |
2604b703 | 8433 | .resize = raid5_resize, |
80c3a6ce | 8434 | .size = raid5_size, |
3d37890b N |
8435 | .check_reshape = raid5_check_reshape, |
8436 | .start_reshape = raid5_start_reshape, | |
cea9c228 | 8437 | .finish_reshape = raid5_finish_reshape, |
2604b703 | 8438 | .quiesce = raid5_quiesce, |
a78d38a1 | 8439 | .takeover = raid4_takeover, |
5c675f83 | 8440 | .congested = raid5_congested, |
0bb0c105 | 8441 | .change_consistency_policy = raid5_change_consistency_policy, |
2604b703 N |
8442 | }; |
8443 | ||
8444 | static int __init raid5_init(void) | |
8445 | { | |
29c6d1bb SAS |
8446 | int ret; |
8447 | ||
851c30c9 SL |
8448 | raid5_wq = alloc_workqueue("raid5wq", |
8449 | WQ_UNBOUND|WQ_MEM_RECLAIM|WQ_CPU_INTENSIVE|WQ_SYSFS, 0); | |
8450 | if (!raid5_wq) | |
8451 | return -ENOMEM; | |
29c6d1bb SAS |
8452 | |
8453 | ret = cpuhp_setup_state_multi(CPUHP_MD_RAID5_PREPARE, | |
8454 | "md/raid5:prepare", | |
8455 | raid456_cpu_up_prepare, | |
8456 | raid456_cpu_dead); | |
8457 | if (ret) { | |
8458 | destroy_workqueue(raid5_wq); | |
8459 | return ret; | |
8460 | } | |
16a53ecc | 8461 | register_md_personality(&raid6_personality); |
2604b703 N |
8462 | register_md_personality(&raid5_personality); |
8463 | register_md_personality(&raid4_personality); | |
8464 | return 0; | |
1da177e4 LT |
8465 | } |
8466 | ||
2604b703 | 8467 | static void raid5_exit(void) |
1da177e4 | 8468 | { |
16a53ecc | 8469 | unregister_md_personality(&raid6_personality); |
2604b703 N |
8470 | unregister_md_personality(&raid5_personality); |
8471 | unregister_md_personality(&raid4_personality); | |
29c6d1bb | 8472 | cpuhp_remove_multi_state(CPUHP_MD_RAID5_PREPARE); |
851c30c9 | 8473 | destroy_workqueue(raid5_wq); |
1da177e4 LT |
8474 | } |
8475 | ||
8476 | module_init(raid5_init); | |
8477 | module_exit(raid5_exit); | |
8478 | MODULE_LICENSE("GPL"); | |
0efb9e61 | 8479 | MODULE_DESCRIPTION("RAID4/5/6 (striping with parity) personality for MD"); |
1da177e4 | 8480 | MODULE_ALIAS("md-personality-4"); /* RAID5 */ |
d9d166c2 N |
8481 | MODULE_ALIAS("md-raid5"); |
8482 | MODULE_ALIAS("md-raid4"); | |
2604b703 N |
8483 | MODULE_ALIAS("md-level-5"); |
8484 | MODULE_ALIAS("md-level-4"); | |
16a53ecc N |
8485 | MODULE_ALIAS("md-personality-8"); /* RAID6 */ |
8486 | MODULE_ALIAS("md-raid6"); | |
8487 | MODULE_ALIAS("md-level-6"); | |
8488 | ||
8489 | /* This used to be two separate modules, they were: */ | |
8490 | MODULE_ALIAS("raid5"); | |
8491 | MODULE_ALIAS("raid6"); |