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 IM |
58 | #include <linux/sched/signal.h> |
59 | ||
a9add5d9 | 60 | #include <trace/events/block.h> |
aaf9f12e | 61 | #include <linux/list_sort.h> |
a9add5d9 | 62 | |
43b2e5d8 | 63 | #include "md.h" |
bff61975 | 64 | #include "raid5.h" |
54071b38 | 65 | #include "raid0.h" |
ef740c37 | 66 | #include "bitmap.h" |
ff875738 | 67 | #include "raid5-log.h" |
72626685 | 68 | |
394ed8e4 SL |
69 | #define UNSUPPORTED_MDDEV_FLAGS (1L << MD_FAILFAST_SUPPORTED) |
70 | ||
851c30c9 SL |
71 | #define cpu_to_group(cpu) cpu_to_node(cpu) |
72 | #define ANY_GROUP NUMA_NO_NODE | |
73 | ||
8e0e99ba N |
74 | static bool devices_handle_discard_safely = false; |
75 | module_param(devices_handle_discard_safely, bool, 0644); | |
76 | MODULE_PARM_DESC(devices_handle_discard_safely, | |
77 | "Set to Y if all devices in each array reliably return zeroes on reads from discarded regions"); | |
851c30c9 | 78 | static struct workqueue_struct *raid5_wq; |
1da177e4 | 79 | |
d1688a6d | 80 | static inline struct hlist_head *stripe_hash(struct r5conf *conf, sector_t sect) |
db298e19 N |
81 | { |
82 | int hash = (sect >> STRIPE_SHIFT) & HASH_MASK; | |
83 | return &conf->stripe_hashtbl[hash]; | |
84 | } | |
1da177e4 | 85 | |
566c09c5 SL |
86 | static inline int stripe_hash_locks_hash(sector_t sect) |
87 | { | |
88 | return (sect >> STRIPE_SHIFT) & STRIPE_HASH_LOCKS_MASK; | |
89 | } | |
90 | ||
91 | static inline void lock_device_hash_lock(struct r5conf *conf, int hash) | |
92 | { | |
93 | spin_lock_irq(conf->hash_locks + hash); | |
94 | spin_lock(&conf->device_lock); | |
95 | } | |
96 | ||
97 | static inline void unlock_device_hash_lock(struct r5conf *conf, int hash) | |
98 | { | |
99 | spin_unlock(&conf->device_lock); | |
100 | spin_unlock_irq(conf->hash_locks + hash); | |
101 | } | |
102 | ||
103 | static inline void lock_all_device_hash_locks_irq(struct r5conf *conf) | |
104 | { | |
105 | int i; | |
3d05f3ae | 106 | spin_lock_irq(conf->hash_locks); |
566c09c5 SL |
107 | for (i = 1; i < NR_STRIPE_HASH_LOCKS; i++) |
108 | spin_lock_nest_lock(conf->hash_locks + i, conf->hash_locks); | |
109 | spin_lock(&conf->device_lock); | |
110 | } | |
111 | ||
112 | static inline void unlock_all_device_hash_locks_irq(struct r5conf *conf) | |
113 | { | |
114 | int i; | |
115 | spin_unlock(&conf->device_lock); | |
3d05f3ae JC |
116 | for (i = NR_STRIPE_HASH_LOCKS - 1; i; i--) |
117 | spin_unlock(conf->hash_locks + i); | |
118 | spin_unlock_irq(conf->hash_locks); | |
566c09c5 SL |
119 | } |
120 | ||
d0dabf7e N |
121 | /* Find first data disk in a raid6 stripe */ |
122 | static inline int raid6_d0(struct stripe_head *sh) | |
123 | { | |
67cc2b81 N |
124 | if (sh->ddf_layout) |
125 | /* ddf always start from first device */ | |
126 | return 0; | |
127 | /* md starts just after Q block */ | |
d0dabf7e N |
128 | if (sh->qd_idx == sh->disks - 1) |
129 | return 0; | |
130 | else | |
131 | return sh->qd_idx + 1; | |
132 | } | |
16a53ecc N |
133 | static inline int raid6_next_disk(int disk, int raid_disks) |
134 | { | |
135 | disk++; | |
136 | return (disk < raid_disks) ? disk : 0; | |
137 | } | |
a4456856 | 138 | |
d0dabf7e N |
139 | /* When walking through the disks in a raid5, starting at raid6_d0, |
140 | * We need to map each disk to a 'slot', where the data disks are slot | |
141 | * 0 .. raid_disks-3, the parity disk is raid_disks-2 and the Q disk | |
142 | * is raid_disks-1. This help does that mapping. | |
143 | */ | |
67cc2b81 N |
144 | static int raid6_idx_to_slot(int idx, struct stripe_head *sh, |
145 | int *count, int syndrome_disks) | |
d0dabf7e | 146 | { |
6629542e | 147 | int slot = *count; |
67cc2b81 | 148 | |
e4424fee | 149 | if (sh->ddf_layout) |
6629542e | 150 | (*count)++; |
d0dabf7e | 151 | if (idx == sh->pd_idx) |
67cc2b81 | 152 | return syndrome_disks; |
d0dabf7e | 153 | if (idx == sh->qd_idx) |
67cc2b81 | 154 | return syndrome_disks + 1; |
e4424fee | 155 | if (!sh->ddf_layout) |
6629542e | 156 | (*count)++; |
d0dabf7e N |
157 | return slot; |
158 | } | |
159 | ||
d1688a6d | 160 | static void print_raid5_conf (struct r5conf *conf); |
1da177e4 | 161 | |
600aa109 DW |
162 | static int stripe_operations_active(struct stripe_head *sh) |
163 | { | |
164 | return sh->check_state || sh->reconstruct_state || | |
165 | test_bit(STRIPE_BIOFILL_RUN, &sh->state) || | |
166 | test_bit(STRIPE_COMPUTE_RUN, &sh->state); | |
167 | } | |
168 | ||
535ae4eb SL |
169 | static bool stripe_is_lowprio(struct stripe_head *sh) |
170 | { | |
171 | return (test_bit(STRIPE_R5C_FULL_STRIPE, &sh->state) || | |
172 | test_bit(STRIPE_R5C_PARTIAL_STRIPE, &sh->state)) && | |
173 | !test_bit(STRIPE_R5C_CACHING, &sh->state); | |
174 | } | |
175 | ||
851c30c9 SL |
176 | static void raid5_wakeup_stripe_thread(struct stripe_head *sh) |
177 | { | |
178 | struct r5conf *conf = sh->raid_conf; | |
179 | struct r5worker_group *group; | |
bfc90cb0 | 180 | int thread_cnt; |
851c30c9 SL |
181 | int i, cpu = sh->cpu; |
182 | ||
183 | if (!cpu_online(cpu)) { | |
184 | cpu = cpumask_any(cpu_online_mask); | |
185 | sh->cpu = cpu; | |
186 | } | |
187 | ||
188 | if (list_empty(&sh->lru)) { | |
189 | struct r5worker_group *group; | |
190 | group = conf->worker_groups + cpu_to_group(cpu); | |
535ae4eb SL |
191 | if (stripe_is_lowprio(sh)) |
192 | list_add_tail(&sh->lru, &group->loprio_list); | |
193 | else | |
194 | list_add_tail(&sh->lru, &group->handle_list); | |
bfc90cb0 SL |
195 | group->stripes_cnt++; |
196 | sh->group = group; | |
851c30c9 SL |
197 | } |
198 | ||
199 | if (conf->worker_cnt_per_group == 0) { | |
200 | md_wakeup_thread(conf->mddev->thread); | |
201 | return; | |
202 | } | |
203 | ||
204 | group = conf->worker_groups + cpu_to_group(sh->cpu); | |
205 | ||
bfc90cb0 SL |
206 | group->workers[0].working = true; |
207 | /* at least one worker should run to avoid race */ | |
208 | queue_work_on(sh->cpu, raid5_wq, &group->workers[0].work); | |
209 | ||
210 | thread_cnt = group->stripes_cnt / MAX_STRIPE_BATCH - 1; | |
211 | /* wakeup more workers */ | |
212 | for (i = 1; i < conf->worker_cnt_per_group && thread_cnt > 0; i++) { | |
213 | if (group->workers[i].working == false) { | |
214 | group->workers[i].working = true; | |
215 | queue_work_on(sh->cpu, raid5_wq, | |
216 | &group->workers[i].work); | |
217 | thread_cnt--; | |
218 | } | |
219 | } | |
851c30c9 SL |
220 | } |
221 | ||
566c09c5 SL |
222 | static void do_release_stripe(struct r5conf *conf, struct stripe_head *sh, |
223 | struct list_head *temp_inactive_list) | |
1da177e4 | 224 | { |
1e6d690b SL |
225 | int i; |
226 | int injournal = 0; /* number of date pages with R5_InJournal */ | |
227 | ||
4eb788df SL |
228 | BUG_ON(!list_empty(&sh->lru)); |
229 | BUG_ON(atomic_read(&conf->active_stripes)==0); | |
1e6d690b SL |
230 | |
231 | if (r5c_is_writeback(conf->log)) | |
232 | for (i = sh->disks; i--; ) | |
233 | if (test_bit(R5_InJournal, &sh->dev[i].flags)) | |
234 | injournal++; | |
a39f7afd | 235 | /* |
5ddf0440 SL |
236 | * In the following cases, the stripe cannot be released to cached |
237 | * lists. Therefore, we make the stripe write out and set | |
238 | * STRIPE_HANDLE: | |
239 | * 1. when quiesce in r5c write back; | |
240 | * 2. when resync is requested fot the stripe. | |
a39f7afd | 241 | */ |
5ddf0440 SL |
242 | if (test_bit(STRIPE_SYNC_REQUESTED, &sh->state) || |
243 | (conf->quiesce && r5c_is_writeback(conf->log) && | |
244 | !test_bit(STRIPE_HANDLE, &sh->state) && injournal != 0)) { | |
a39f7afd SL |
245 | if (test_bit(STRIPE_R5C_CACHING, &sh->state)) |
246 | r5c_make_stripe_write_out(sh); | |
247 | set_bit(STRIPE_HANDLE, &sh->state); | |
248 | } | |
1e6d690b | 249 | |
4eb788df SL |
250 | if (test_bit(STRIPE_HANDLE, &sh->state)) { |
251 | if (test_bit(STRIPE_DELAYED, &sh->state) && | |
ad3ab8b6 | 252 | !test_bit(STRIPE_PREREAD_ACTIVE, &sh->state)) |
4eb788df | 253 | list_add_tail(&sh->lru, &conf->delayed_list); |
ad3ab8b6 | 254 | else if (test_bit(STRIPE_BIT_DELAY, &sh->state) && |
4eb788df SL |
255 | sh->bm_seq - conf->seq_write > 0) |
256 | list_add_tail(&sh->lru, &conf->bitmap_list); | |
257 | else { | |
258 | clear_bit(STRIPE_DELAYED, &sh->state); | |
259 | clear_bit(STRIPE_BIT_DELAY, &sh->state); | |
851c30c9 | 260 | if (conf->worker_cnt_per_group == 0) { |
535ae4eb SL |
261 | if (stripe_is_lowprio(sh)) |
262 | list_add_tail(&sh->lru, | |
263 | &conf->loprio_list); | |
264 | else | |
265 | list_add_tail(&sh->lru, | |
266 | &conf->handle_list); | |
851c30c9 SL |
267 | } else { |
268 | raid5_wakeup_stripe_thread(sh); | |
269 | return; | |
270 | } | |
4eb788df SL |
271 | } |
272 | md_wakeup_thread(conf->mddev->thread); | |
273 | } else { | |
274 | BUG_ON(stripe_operations_active(sh)); | |
275 | if (test_and_clear_bit(STRIPE_PREREAD_ACTIVE, &sh->state)) | |
276 | if (atomic_dec_return(&conf->preread_active_stripes) | |
277 | < IO_THRESHOLD) | |
278 | md_wakeup_thread(conf->mddev->thread); | |
279 | atomic_dec(&conf->active_stripes); | |
1e6d690b SL |
280 | if (!test_bit(STRIPE_EXPANDING, &sh->state)) { |
281 | if (!r5c_is_writeback(conf->log)) | |
282 | list_add_tail(&sh->lru, temp_inactive_list); | |
283 | else { | |
284 | WARN_ON(test_bit(R5_InJournal, &sh->dev[sh->pd_idx].flags)); | |
285 | if (injournal == 0) | |
286 | list_add_tail(&sh->lru, temp_inactive_list); | |
287 | else if (injournal == conf->raid_disks - conf->max_degraded) { | |
288 | /* full stripe */ | |
289 | if (!test_and_set_bit(STRIPE_R5C_FULL_STRIPE, &sh->state)) | |
290 | atomic_inc(&conf->r5c_cached_full_stripes); | |
291 | if (test_and_clear_bit(STRIPE_R5C_PARTIAL_STRIPE, &sh->state)) | |
292 | atomic_dec(&conf->r5c_cached_partial_stripes); | |
293 | list_add_tail(&sh->lru, &conf->r5c_full_stripe_list); | |
a39f7afd | 294 | r5c_check_cached_full_stripe(conf); |
03b047f4 SL |
295 | } else |
296 | /* | |
297 | * STRIPE_R5C_PARTIAL_STRIPE is set in | |
298 | * r5c_try_caching_write(). No need to | |
299 | * set it again. | |
300 | */ | |
1e6d690b | 301 | list_add_tail(&sh->lru, &conf->r5c_partial_stripe_list); |
1e6d690b SL |
302 | } |
303 | } | |
1da177e4 LT |
304 | } |
305 | } | |
d0dabf7e | 306 | |
566c09c5 SL |
307 | static void __release_stripe(struct r5conf *conf, struct stripe_head *sh, |
308 | struct list_head *temp_inactive_list) | |
4eb788df SL |
309 | { |
310 | if (atomic_dec_and_test(&sh->count)) | |
566c09c5 SL |
311 | do_release_stripe(conf, sh, temp_inactive_list); |
312 | } | |
313 | ||
314 | /* | |
315 | * @hash could be NR_STRIPE_HASH_LOCKS, then we have a list of inactive_list | |
316 | * | |
317 | * Be careful: Only one task can add/delete stripes from temp_inactive_list at | |
318 | * given time. Adding stripes only takes device lock, while deleting stripes | |
319 | * only takes hash lock. | |
320 | */ | |
321 | static void release_inactive_stripe_list(struct r5conf *conf, | |
322 | struct list_head *temp_inactive_list, | |
323 | int hash) | |
324 | { | |
325 | int size; | |
6ab2a4b8 | 326 | bool do_wakeup = false; |
566c09c5 SL |
327 | unsigned long flags; |
328 | ||
329 | if (hash == NR_STRIPE_HASH_LOCKS) { | |
330 | size = NR_STRIPE_HASH_LOCKS; | |
331 | hash = NR_STRIPE_HASH_LOCKS - 1; | |
332 | } else | |
333 | size = 1; | |
334 | while (size) { | |
335 | struct list_head *list = &temp_inactive_list[size - 1]; | |
336 | ||
337 | /* | |
6d036f7d | 338 | * We don't hold any lock here yet, raid5_get_active_stripe() might |
566c09c5 SL |
339 | * remove stripes from the list |
340 | */ | |
341 | if (!list_empty_careful(list)) { | |
342 | spin_lock_irqsave(conf->hash_locks + hash, flags); | |
4bda556a SL |
343 | if (list_empty(conf->inactive_list + hash) && |
344 | !list_empty(list)) | |
345 | atomic_dec(&conf->empty_inactive_list_nr); | |
566c09c5 | 346 | list_splice_tail_init(list, conf->inactive_list + hash); |
6ab2a4b8 | 347 | do_wakeup = true; |
566c09c5 SL |
348 | spin_unlock_irqrestore(conf->hash_locks + hash, flags); |
349 | } | |
350 | size--; | |
351 | hash--; | |
352 | } | |
353 | ||
354 | if (do_wakeup) { | |
6ab2a4b8 | 355 | wake_up(&conf->wait_for_stripe); |
b1b46486 YL |
356 | if (atomic_read(&conf->active_stripes) == 0) |
357 | wake_up(&conf->wait_for_quiescent); | |
566c09c5 SL |
358 | if (conf->retry_read_aligned) |
359 | md_wakeup_thread(conf->mddev->thread); | |
360 | } | |
4eb788df SL |
361 | } |
362 | ||
773ca82f | 363 | /* should hold conf->device_lock already */ |
566c09c5 SL |
364 | static int release_stripe_list(struct r5conf *conf, |
365 | struct list_head *temp_inactive_list) | |
773ca82f | 366 | { |
eae8263f | 367 | struct stripe_head *sh, *t; |
773ca82f SL |
368 | int count = 0; |
369 | struct llist_node *head; | |
370 | ||
371 | head = llist_del_all(&conf->released_stripes); | |
d265d9dc | 372 | head = llist_reverse_order(head); |
eae8263f | 373 | llist_for_each_entry_safe(sh, t, head, release_list) { |
566c09c5 SL |
374 | int hash; |
375 | ||
773ca82f SL |
376 | /* sh could be readded after STRIPE_ON_RELEASE_LIST is cleard */ |
377 | smp_mb(); | |
378 | clear_bit(STRIPE_ON_RELEASE_LIST, &sh->state); | |
379 | /* | |
380 | * Don't worry the bit is set here, because if the bit is set | |
381 | * again, the count is always > 1. This is true for | |
382 | * STRIPE_ON_UNPLUG_LIST bit too. | |
383 | */ | |
566c09c5 SL |
384 | hash = sh->hash_lock_index; |
385 | __release_stripe(conf, sh, &temp_inactive_list[hash]); | |
773ca82f SL |
386 | count++; |
387 | } | |
388 | ||
389 | return count; | |
390 | } | |
391 | ||
6d036f7d | 392 | void raid5_release_stripe(struct stripe_head *sh) |
1da177e4 | 393 | { |
d1688a6d | 394 | struct r5conf *conf = sh->raid_conf; |
1da177e4 | 395 | unsigned long flags; |
566c09c5 SL |
396 | struct list_head list; |
397 | int hash; | |
773ca82f | 398 | bool wakeup; |
16a53ecc | 399 | |
cf170f3f ES |
400 | /* Avoid release_list until the last reference. |
401 | */ | |
402 | if (atomic_add_unless(&sh->count, -1, 1)) | |
403 | return; | |
404 | ||
ad4068de | 405 | if (unlikely(!conf->mddev->thread) || |
406 | test_and_set_bit(STRIPE_ON_RELEASE_LIST, &sh->state)) | |
773ca82f SL |
407 | goto slow_path; |
408 | wakeup = llist_add(&sh->release_list, &conf->released_stripes); | |
409 | if (wakeup) | |
410 | md_wakeup_thread(conf->mddev->thread); | |
411 | return; | |
412 | slow_path: | |
4eb788df | 413 | local_irq_save(flags); |
773ca82f | 414 | /* we are ok here if STRIPE_ON_RELEASE_LIST is set or not */ |
4eb788df | 415 | if (atomic_dec_and_lock(&sh->count, &conf->device_lock)) { |
566c09c5 SL |
416 | INIT_LIST_HEAD(&list); |
417 | hash = sh->hash_lock_index; | |
418 | do_release_stripe(conf, sh, &list); | |
4eb788df | 419 | spin_unlock(&conf->device_lock); |
566c09c5 | 420 | release_inactive_stripe_list(conf, &list, hash); |
4eb788df SL |
421 | } |
422 | local_irq_restore(flags); | |
1da177e4 LT |
423 | } |
424 | ||
fccddba0 | 425 | static inline void remove_hash(struct stripe_head *sh) |
1da177e4 | 426 | { |
45b4233c DW |
427 | pr_debug("remove_hash(), stripe %llu\n", |
428 | (unsigned long long)sh->sector); | |
1da177e4 | 429 | |
fccddba0 | 430 | hlist_del_init(&sh->hash); |
1da177e4 LT |
431 | } |
432 | ||
d1688a6d | 433 | static inline void insert_hash(struct r5conf *conf, struct stripe_head *sh) |
1da177e4 | 434 | { |
fccddba0 | 435 | struct hlist_head *hp = stripe_hash(conf, sh->sector); |
1da177e4 | 436 | |
45b4233c DW |
437 | pr_debug("insert_hash(), stripe %llu\n", |
438 | (unsigned long long)sh->sector); | |
1da177e4 | 439 | |
fccddba0 | 440 | hlist_add_head(&sh->hash, hp); |
1da177e4 LT |
441 | } |
442 | ||
1da177e4 | 443 | /* find an idle stripe, make sure it is unhashed, and return it. */ |
566c09c5 | 444 | static struct stripe_head *get_free_stripe(struct r5conf *conf, int hash) |
1da177e4 LT |
445 | { |
446 | struct stripe_head *sh = NULL; | |
447 | struct list_head *first; | |
448 | ||
566c09c5 | 449 | if (list_empty(conf->inactive_list + hash)) |
1da177e4 | 450 | goto out; |
566c09c5 | 451 | first = (conf->inactive_list + hash)->next; |
1da177e4 LT |
452 | sh = list_entry(first, struct stripe_head, lru); |
453 | list_del_init(first); | |
454 | remove_hash(sh); | |
455 | atomic_inc(&conf->active_stripes); | |
566c09c5 | 456 | BUG_ON(hash != sh->hash_lock_index); |
4bda556a SL |
457 | if (list_empty(conf->inactive_list + hash)) |
458 | atomic_inc(&conf->empty_inactive_list_nr); | |
1da177e4 LT |
459 | out: |
460 | return sh; | |
461 | } | |
462 | ||
e4e11e38 | 463 | static void shrink_buffers(struct stripe_head *sh) |
1da177e4 LT |
464 | { |
465 | struct page *p; | |
466 | int i; | |
e4e11e38 | 467 | int num = sh->raid_conf->pool_size; |
1da177e4 | 468 | |
e4e11e38 | 469 | for (i = 0; i < num ; i++) { |
d592a996 | 470 | WARN_ON(sh->dev[i].page != sh->dev[i].orig_page); |
1da177e4 LT |
471 | p = sh->dev[i].page; |
472 | if (!p) | |
473 | continue; | |
474 | sh->dev[i].page = NULL; | |
2d1f3b5d | 475 | put_page(p); |
1da177e4 LT |
476 | } |
477 | } | |
478 | ||
a9683a79 | 479 | static int grow_buffers(struct stripe_head *sh, gfp_t gfp) |
1da177e4 LT |
480 | { |
481 | int i; | |
e4e11e38 | 482 | int num = sh->raid_conf->pool_size; |
1da177e4 | 483 | |
e4e11e38 | 484 | for (i = 0; i < num; i++) { |
1da177e4 LT |
485 | struct page *page; |
486 | ||
a9683a79 | 487 | if (!(page = alloc_page(gfp))) { |
1da177e4 LT |
488 | return 1; |
489 | } | |
490 | sh->dev[i].page = page; | |
d592a996 | 491 | sh->dev[i].orig_page = page; |
1da177e4 | 492 | } |
3418d036 | 493 | |
1da177e4 LT |
494 | return 0; |
495 | } | |
496 | ||
784052ec | 497 | static void raid5_build_block(struct stripe_head *sh, int i, int previous); |
d1688a6d | 498 | static void stripe_set_idx(sector_t stripe, struct r5conf *conf, int previous, |
911d4ee8 | 499 | struct stripe_head *sh); |
1da177e4 | 500 | |
b5663ba4 | 501 | static void init_stripe(struct stripe_head *sh, sector_t sector, int previous) |
1da177e4 | 502 | { |
d1688a6d | 503 | struct r5conf *conf = sh->raid_conf; |
566c09c5 | 504 | int i, seq; |
1da177e4 | 505 | |
78bafebd ES |
506 | BUG_ON(atomic_read(&sh->count) != 0); |
507 | BUG_ON(test_bit(STRIPE_HANDLE, &sh->state)); | |
600aa109 | 508 | BUG_ON(stripe_operations_active(sh)); |
59fc630b | 509 | BUG_ON(sh->batch_head); |
d84e0f10 | 510 | |
45b4233c | 511 | pr_debug("init_stripe called, stripe %llu\n", |
b8e6a15a | 512 | (unsigned long long)sector); |
566c09c5 SL |
513 | retry: |
514 | seq = read_seqcount_begin(&conf->gen_lock); | |
86b42c71 | 515 | sh->generation = conf->generation - previous; |
b5663ba4 | 516 | sh->disks = previous ? conf->previous_raid_disks : conf->raid_disks; |
1da177e4 | 517 | sh->sector = sector; |
911d4ee8 | 518 | stripe_set_idx(sector, conf, previous, sh); |
1da177e4 LT |
519 | sh->state = 0; |
520 | ||
7ecaa1e6 | 521 | for (i = sh->disks; i--; ) { |
1da177e4 LT |
522 | struct r5dev *dev = &sh->dev[i]; |
523 | ||
d84e0f10 | 524 | if (dev->toread || dev->read || dev->towrite || dev->written || |
1da177e4 | 525 | test_bit(R5_LOCKED, &dev->flags)) { |
cc6167b4 | 526 | pr_err("sector=%llx i=%d %p %p %p %p %d\n", |
1da177e4 | 527 | (unsigned long long)sh->sector, i, dev->toread, |
d84e0f10 | 528 | dev->read, dev->towrite, dev->written, |
1da177e4 | 529 | test_bit(R5_LOCKED, &dev->flags)); |
8cfa7b0f | 530 | WARN_ON(1); |
1da177e4 LT |
531 | } |
532 | dev->flags = 0; | |
784052ec | 533 | raid5_build_block(sh, i, previous); |
1da177e4 | 534 | } |
566c09c5 SL |
535 | if (read_seqcount_retry(&conf->gen_lock, seq)) |
536 | goto retry; | |
7a87f434 | 537 | sh->overwrite_disks = 0; |
1da177e4 | 538 | insert_hash(conf, sh); |
851c30c9 | 539 | sh->cpu = smp_processor_id(); |
da41ba65 | 540 | set_bit(STRIPE_BATCH_READY, &sh->state); |
1da177e4 LT |
541 | } |
542 | ||
d1688a6d | 543 | static struct stripe_head *__find_stripe(struct r5conf *conf, sector_t sector, |
86b42c71 | 544 | short generation) |
1da177e4 LT |
545 | { |
546 | struct stripe_head *sh; | |
547 | ||
45b4233c | 548 | pr_debug("__find_stripe, sector %llu\n", (unsigned long long)sector); |
b67bfe0d | 549 | hlist_for_each_entry(sh, stripe_hash(conf, sector), hash) |
86b42c71 | 550 | if (sh->sector == sector && sh->generation == generation) |
1da177e4 | 551 | return sh; |
45b4233c | 552 | pr_debug("__stripe %llu not in cache\n", (unsigned long long)sector); |
1da177e4 LT |
553 | return NULL; |
554 | } | |
555 | ||
674806d6 N |
556 | /* |
557 | * Need to check if array has failed when deciding whether to: | |
558 | * - start an array | |
559 | * - remove non-faulty devices | |
560 | * - add a spare | |
561 | * - allow a reshape | |
562 | * This determination is simple when no reshape is happening. | |
563 | * However if there is a reshape, we need to carefully check | |
564 | * both the before and after sections. | |
565 | * This is because some failed devices may only affect one | |
566 | * of the two sections, and some non-in_sync devices may | |
567 | * be insync in the section most affected by failed devices. | |
568 | */ | |
2e38a37f | 569 | int raid5_calc_degraded(struct r5conf *conf) |
674806d6 | 570 | { |
908f4fbd | 571 | int degraded, degraded2; |
674806d6 | 572 | int i; |
674806d6 N |
573 | |
574 | rcu_read_lock(); | |
575 | degraded = 0; | |
576 | for (i = 0; i < conf->previous_raid_disks; i++) { | |
3cb03002 | 577 | struct md_rdev *rdev = rcu_dereference(conf->disks[i].rdev); |
e5c86471 N |
578 | if (rdev && test_bit(Faulty, &rdev->flags)) |
579 | rdev = rcu_dereference(conf->disks[i].replacement); | |
674806d6 N |
580 | if (!rdev || test_bit(Faulty, &rdev->flags)) |
581 | degraded++; | |
582 | else if (test_bit(In_sync, &rdev->flags)) | |
583 | ; | |
584 | else | |
585 | /* not in-sync or faulty. | |
586 | * If the reshape increases the number of devices, | |
587 | * this is being recovered by the reshape, so | |
588 | * this 'previous' section is not in_sync. | |
589 | * If the number of devices is being reduced however, | |
590 | * the device can only be part of the array if | |
591 | * we are reverting a reshape, so this section will | |
592 | * be in-sync. | |
593 | */ | |
594 | if (conf->raid_disks >= conf->previous_raid_disks) | |
595 | degraded++; | |
596 | } | |
597 | rcu_read_unlock(); | |
908f4fbd N |
598 | if (conf->raid_disks == conf->previous_raid_disks) |
599 | return degraded; | |
674806d6 | 600 | rcu_read_lock(); |
908f4fbd | 601 | degraded2 = 0; |
674806d6 | 602 | for (i = 0; i < conf->raid_disks; i++) { |
3cb03002 | 603 | struct md_rdev *rdev = rcu_dereference(conf->disks[i].rdev); |
e5c86471 N |
604 | if (rdev && test_bit(Faulty, &rdev->flags)) |
605 | rdev = rcu_dereference(conf->disks[i].replacement); | |
674806d6 | 606 | if (!rdev || test_bit(Faulty, &rdev->flags)) |
908f4fbd | 607 | degraded2++; |
674806d6 N |
608 | else if (test_bit(In_sync, &rdev->flags)) |
609 | ; | |
610 | else | |
611 | /* not in-sync or faulty. | |
612 | * If reshape increases the number of devices, this | |
613 | * section has already been recovered, else it | |
614 | * almost certainly hasn't. | |
615 | */ | |
616 | if (conf->raid_disks <= conf->previous_raid_disks) | |
908f4fbd | 617 | degraded2++; |
674806d6 N |
618 | } |
619 | rcu_read_unlock(); | |
908f4fbd N |
620 | if (degraded2 > degraded) |
621 | return degraded2; | |
622 | return degraded; | |
623 | } | |
624 | ||
625 | static int has_failed(struct r5conf *conf) | |
626 | { | |
627 | int degraded; | |
628 | ||
629 | if (conf->mddev->reshape_position == MaxSector) | |
630 | return conf->mddev->degraded > conf->max_degraded; | |
631 | ||
2e38a37f | 632 | degraded = raid5_calc_degraded(conf); |
674806d6 N |
633 | if (degraded > conf->max_degraded) |
634 | return 1; | |
635 | return 0; | |
636 | } | |
637 | ||
6d036f7d SL |
638 | struct stripe_head * |
639 | raid5_get_active_stripe(struct r5conf *conf, sector_t sector, | |
640 | int previous, int noblock, int noquiesce) | |
1da177e4 LT |
641 | { |
642 | struct stripe_head *sh; | |
566c09c5 | 643 | int hash = stripe_hash_locks_hash(sector); |
ff00d3b4 | 644 | int inc_empty_inactive_list_flag; |
1da177e4 | 645 | |
45b4233c | 646 | pr_debug("get_stripe, sector %llu\n", (unsigned long long)sector); |
1da177e4 | 647 | |
566c09c5 | 648 | spin_lock_irq(conf->hash_locks + hash); |
1da177e4 LT |
649 | |
650 | do { | |
b1b46486 | 651 | wait_event_lock_irq(conf->wait_for_quiescent, |
a8c906ca | 652 | conf->quiesce == 0 || noquiesce, |
566c09c5 | 653 | *(conf->hash_locks + hash)); |
86b42c71 | 654 | sh = __find_stripe(conf, sector, conf->generation - previous); |
1da177e4 | 655 | if (!sh) { |
edbe83ab | 656 | if (!test_bit(R5_INACTIVE_BLOCKED, &conf->cache_state)) { |
566c09c5 | 657 | sh = get_free_stripe(conf, hash); |
713bc5c2 SL |
658 | if (!sh && !test_bit(R5_DID_ALLOC, |
659 | &conf->cache_state)) | |
edbe83ab N |
660 | set_bit(R5_ALLOC_MORE, |
661 | &conf->cache_state); | |
662 | } | |
1da177e4 LT |
663 | if (noblock && sh == NULL) |
664 | break; | |
a39f7afd SL |
665 | |
666 | r5c_check_stripe_cache_usage(conf); | |
1da177e4 | 667 | if (!sh) { |
5423399a N |
668 | set_bit(R5_INACTIVE_BLOCKED, |
669 | &conf->cache_state); | |
a39f7afd | 670 | r5l_wake_reclaim(conf->log, 0); |
6ab2a4b8 SL |
671 | wait_event_lock_irq( |
672 | conf->wait_for_stripe, | |
566c09c5 SL |
673 | !list_empty(conf->inactive_list + hash) && |
674 | (atomic_read(&conf->active_stripes) | |
675 | < (conf->max_nr_stripes * 3 / 4) | |
5423399a N |
676 | || !test_bit(R5_INACTIVE_BLOCKED, |
677 | &conf->cache_state)), | |
6ab2a4b8 | 678 | *(conf->hash_locks + hash)); |
5423399a N |
679 | clear_bit(R5_INACTIVE_BLOCKED, |
680 | &conf->cache_state); | |
7da9d450 | 681 | } else { |
b5663ba4 | 682 | init_stripe(sh, sector, previous); |
7da9d450 N |
683 | atomic_inc(&sh->count); |
684 | } | |
e240c183 | 685 | } else if (!atomic_inc_not_zero(&sh->count)) { |
6d183de4 | 686 | spin_lock(&conf->device_lock); |
e240c183 | 687 | if (!atomic_read(&sh->count)) { |
1da177e4 LT |
688 | if (!test_bit(STRIPE_HANDLE, &sh->state)) |
689 | atomic_inc(&conf->active_stripes); | |
5af9bef7 N |
690 | BUG_ON(list_empty(&sh->lru) && |
691 | !test_bit(STRIPE_EXPANDING, &sh->state)); | |
ff00d3b4 ZL |
692 | inc_empty_inactive_list_flag = 0; |
693 | if (!list_empty(conf->inactive_list + hash)) | |
694 | inc_empty_inactive_list_flag = 1; | |
16a53ecc | 695 | list_del_init(&sh->lru); |
ff00d3b4 ZL |
696 | if (list_empty(conf->inactive_list + hash) && inc_empty_inactive_list_flag) |
697 | atomic_inc(&conf->empty_inactive_list_nr); | |
bfc90cb0 SL |
698 | if (sh->group) { |
699 | sh->group->stripes_cnt--; | |
700 | sh->group = NULL; | |
701 | } | |
1da177e4 | 702 | } |
7da9d450 | 703 | atomic_inc(&sh->count); |
6d183de4 | 704 | spin_unlock(&conf->device_lock); |
1da177e4 LT |
705 | } |
706 | } while (sh == NULL); | |
707 | ||
566c09c5 | 708 | spin_unlock_irq(conf->hash_locks + hash); |
1da177e4 LT |
709 | return sh; |
710 | } | |
711 | ||
7a87f434 | 712 | static bool is_full_stripe_write(struct stripe_head *sh) |
713 | { | |
714 | BUG_ON(sh->overwrite_disks > (sh->disks - sh->raid_conf->max_degraded)); | |
715 | return sh->overwrite_disks == (sh->disks - sh->raid_conf->max_degraded); | |
716 | } | |
717 | ||
59fc630b | 718 | static void lock_two_stripes(struct stripe_head *sh1, struct stripe_head *sh2) |
719 | { | |
59fc630b | 720 | if (sh1 > sh2) { |
3d05f3ae | 721 | spin_lock_irq(&sh2->stripe_lock); |
59fc630b | 722 | spin_lock_nested(&sh1->stripe_lock, 1); |
723 | } else { | |
3d05f3ae | 724 | spin_lock_irq(&sh1->stripe_lock); |
59fc630b | 725 | spin_lock_nested(&sh2->stripe_lock, 1); |
726 | } | |
727 | } | |
728 | ||
729 | static void unlock_two_stripes(struct stripe_head *sh1, struct stripe_head *sh2) | |
730 | { | |
731 | spin_unlock(&sh1->stripe_lock); | |
3d05f3ae | 732 | spin_unlock_irq(&sh2->stripe_lock); |
59fc630b | 733 | } |
734 | ||
735 | /* Only freshly new full stripe normal write stripe can be added to a batch list */ | |
736 | static bool stripe_can_batch(struct stripe_head *sh) | |
737 | { | |
9c3e333d SL |
738 | struct r5conf *conf = sh->raid_conf; |
739 | ||
3418d036 | 740 | if (conf->log || raid5_has_ppl(conf)) |
9c3e333d | 741 | return false; |
59fc630b | 742 | return test_bit(STRIPE_BATCH_READY, &sh->state) && |
d0852df5 | 743 | !test_bit(STRIPE_BITMAP_PENDING, &sh->state) && |
59fc630b | 744 | is_full_stripe_write(sh); |
745 | } | |
746 | ||
747 | /* we only do back search */ | |
748 | static void stripe_add_to_batch_list(struct r5conf *conf, struct stripe_head *sh) | |
749 | { | |
750 | struct stripe_head *head; | |
751 | sector_t head_sector, tmp_sec; | |
752 | int hash; | |
753 | int dd_idx; | |
ff00d3b4 | 754 | int inc_empty_inactive_list_flag; |
59fc630b | 755 | |
59fc630b | 756 | /* Don't cross chunks, so stripe pd_idx/qd_idx is the same */ |
757 | tmp_sec = sh->sector; | |
758 | if (!sector_div(tmp_sec, conf->chunk_sectors)) | |
759 | return; | |
760 | head_sector = sh->sector - STRIPE_SECTORS; | |
761 | ||
762 | hash = stripe_hash_locks_hash(head_sector); | |
763 | spin_lock_irq(conf->hash_locks + hash); | |
764 | head = __find_stripe(conf, head_sector, conf->generation); | |
765 | if (head && !atomic_inc_not_zero(&head->count)) { | |
766 | spin_lock(&conf->device_lock); | |
767 | if (!atomic_read(&head->count)) { | |
768 | if (!test_bit(STRIPE_HANDLE, &head->state)) | |
769 | atomic_inc(&conf->active_stripes); | |
770 | BUG_ON(list_empty(&head->lru) && | |
771 | !test_bit(STRIPE_EXPANDING, &head->state)); | |
ff00d3b4 ZL |
772 | inc_empty_inactive_list_flag = 0; |
773 | if (!list_empty(conf->inactive_list + hash)) | |
774 | inc_empty_inactive_list_flag = 1; | |
59fc630b | 775 | list_del_init(&head->lru); |
ff00d3b4 ZL |
776 | if (list_empty(conf->inactive_list + hash) && inc_empty_inactive_list_flag) |
777 | atomic_inc(&conf->empty_inactive_list_nr); | |
59fc630b | 778 | if (head->group) { |
779 | head->group->stripes_cnt--; | |
780 | head->group = NULL; | |
781 | } | |
782 | } | |
783 | atomic_inc(&head->count); | |
784 | spin_unlock(&conf->device_lock); | |
785 | } | |
786 | spin_unlock_irq(conf->hash_locks + hash); | |
787 | ||
788 | if (!head) | |
789 | return; | |
790 | if (!stripe_can_batch(head)) | |
791 | goto out; | |
792 | ||
793 | lock_two_stripes(head, sh); | |
794 | /* clear_batch_ready clear the flag */ | |
795 | if (!stripe_can_batch(head) || !stripe_can_batch(sh)) | |
796 | goto unlock_out; | |
797 | ||
798 | if (sh->batch_head) | |
799 | goto unlock_out; | |
800 | ||
801 | dd_idx = 0; | |
802 | while (dd_idx == sh->pd_idx || dd_idx == sh->qd_idx) | |
803 | dd_idx++; | |
1eff9d32 | 804 | if (head->dev[dd_idx].towrite->bi_opf != sh->dev[dd_idx].towrite->bi_opf || |
796a5cf0 | 805 | bio_op(head->dev[dd_idx].towrite) != bio_op(sh->dev[dd_idx].towrite)) |
59fc630b | 806 | goto unlock_out; |
807 | ||
808 | if (head->batch_head) { | |
809 | spin_lock(&head->batch_head->batch_lock); | |
810 | /* This batch list is already running */ | |
811 | if (!stripe_can_batch(head)) { | |
812 | spin_unlock(&head->batch_head->batch_lock); | |
813 | goto unlock_out; | |
814 | } | |
815 | ||
816 | /* | |
817 | * at this point, head's BATCH_READY could be cleared, but we | |
818 | * can still add the stripe to batch list | |
819 | */ | |
820 | list_add(&sh->batch_list, &head->batch_list); | |
821 | spin_unlock(&head->batch_head->batch_lock); | |
822 | ||
823 | sh->batch_head = head->batch_head; | |
824 | } else { | |
825 | head->batch_head = head; | |
826 | sh->batch_head = head->batch_head; | |
827 | spin_lock(&head->batch_lock); | |
828 | list_add_tail(&sh->batch_list, &head->batch_list); | |
829 | spin_unlock(&head->batch_lock); | |
830 | } | |
831 | ||
832 | if (test_and_clear_bit(STRIPE_PREREAD_ACTIVE, &sh->state)) | |
833 | if (atomic_dec_return(&conf->preread_active_stripes) | |
834 | < IO_THRESHOLD) | |
835 | md_wakeup_thread(conf->mddev->thread); | |
836 | ||
2b6b2457 N |
837 | if (test_and_clear_bit(STRIPE_BIT_DELAY, &sh->state)) { |
838 | int seq = sh->bm_seq; | |
839 | if (test_bit(STRIPE_BIT_DELAY, &sh->batch_head->state) && | |
840 | sh->batch_head->bm_seq > seq) | |
841 | seq = sh->batch_head->bm_seq; | |
842 | set_bit(STRIPE_BIT_DELAY, &sh->batch_head->state); | |
843 | sh->batch_head->bm_seq = seq; | |
844 | } | |
845 | ||
59fc630b | 846 | atomic_inc(&sh->count); |
847 | unlock_out: | |
848 | unlock_two_stripes(head, sh); | |
849 | out: | |
6d036f7d | 850 | raid5_release_stripe(head); |
59fc630b | 851 | } |
852 | ||
05616be5 N |
853 | /* Determine if 'data_offset' or 'new_data_offset' should be used |
854 | * in this stripe_head. | |
855 | */ | |
856 | static int use_new_offset(struct r5conf *conf, struct stripe_head *sh) | |
857 | { | |
858 | sector_t progress = conf->reshape_progress; | |
859 | /* Need a memory barrier to make sure we see the value | |
860 | * of conf->generation, or ->data_offset that was set before | |
861 | * reshape_progress was updated. | |
862 | */ | |
863 | smp_rmb(); | |
864 | if (progress == MaxSector) | |
865 | return 0; | |
866 | if (sh->generation == conf->generation - 1) | |
867 | return 0; | |
868 | /* We are in a reshape, and this is a new-generation stripe, | |
869 | * so use new_data_offset. | |
870 | */ | |
871 | return 1; | |
872 | } | |
873 | ||
aaf9f12e | 874 | static void dispatch_bio_list(struct bio_list *tmp) |
765d704d | 875 | { |
765d704d SL |
876 | struct bio *bio; |
877 | ||
aaf9f12e SL |
878 | while ((bio = bio_list_pop(tmp))) |
879 | generic_make_request(bio); | |
880 | } | |
881 | ||
882 | static int cmp_stripe(void *priv, struct list_head *a, struct list_head *b) | |
883 | { | |
884 | const struct r5pending_data *da = list_entry(a, | |
885 | struct r5pending_data, sibling); | |
886 | const struct r5pending_data *db = list_entry(b, | |
887 | struct r5pending_data, sibling); | |
888 | if (da->sector > db->sector) | |
889 | return 1; | |
890 | if (da->sector < db->sector) | |
891 | return -1; | |
892 | return 0; | |
893 | } | |
894 | ||
895 | static void dispatch_defer_bios(struct r5conf *conf, int target, | |
896 | struct bio_list *list) | |
897 | { | |
898 | struct r5pending_data *data; | |
899 | struct list_head *first, *next = NULL; | |
900 | int cnt = 0; | |
901 | ||
902 | if (conf->pending_data_cnt == 0) | |
903 | return; | |
904 | ||
905 | list_sort(NULL, &conf->pending_list, cmp_stripe); | |
906 | ||
907 | first = conf->pending_list.next; | |
908 | ||
909 | /* temporarily move the head */ | |
910 | if (conf->next_pending_data) | |
911 | list_move_tail(&conf->pending_list, | |
912 | &conf->next_pending_data->sibling); | |
913 | ||
914 | while (!list_empty(&conf->pending_list)) { | |
915 | data = list_first_entry(&conf->pending_list, | |
916 | struct r5pending_data, sibling); | |
917 | if (&data->sibling == first) | |
918 | first = data->sibling.next; | |
919 | next = data->sibling.next; | |
920 | ||
921 | bio_list_merge(list, &data->bios); | |
922 | list_move(&data->sibling, &conf->free_list); | |
923 | cnt++; | |
924 | if (cnt >= target) | |
925 | break; | |
926 | } | |
927 | conf->pending_data_cnt -= cnt; | |
928 | BUG_ON(conf->pending_data_cnt < 0 || cnt < target); | |
929 | ||
930 | if (next != &conf->pending_list) | |
931 | conf->next_pending_data = list_entry(next, | |
932 | struct r5pending_data, sibling); | |
933 | else | |
934 | conf->next_pending_data = NULL; | |
935 | /* list isn't empty */ | |
936 | if (first != &conf->pending_list) | |
937 | list_move_tail(&conf->pending_list, first); | |
938 | } | |
939 | ||
940 | static void flush_deferred_bios(struct r5conf *conf) | |
941 | { | |
942 | struct bio_list tmp = BIO_EMPTY_LIST; | |
943 | ||
944 | if (conf->pending_data_cnt == 0) | |
765d704d SL |
945 | return; |
946 | ||
765d704d | 947 | spin_lock(&conf->pending_bios_lock); |
aaf9f12e SL |
948 | dispatch_defer_bios(conf, conf->pending_data_cnt, &tmp); |
949 | BUG_ON(conf->pending_data_cnt != 0); | |
765d704d SL |
950 | spin_unlock(&conf->pending_bios_lock); |
951 | ||
aaf9f12e | 952 | dispatch_bio_list(&tmp); |
765d704d SL |
953 | } |
954 | ||
aaf9f12e SL |
955 | static void defer_issue_bios(struct r5conf *conf, sector_t sector, |
956 | struct bio_list *bios) | |
765d704d | 957 | { |
aaf9f12e SL |
958 | struct bio_list tmp = BIO_EMPTY_LIST; |
959 | struct r5pending_data *ent; | |
960 | ||
765d704d | 961 | spin_lock(&conf->pending_bios_lock); |
aaf9f12e SL |
962 | ent = list_first_entry(&conf->free_list, struct r5pending_data, |
963 | sibling); | |
964 | list_move_tail(&ent->sibling, &conf->pending_list); | |
965 | ent->sector = sector; | |
966 | bio_list_init(&ent->bios); | |
967 | bio_list_merge(&ent->bios, bios); | |
968 | conf->pending_data_cnt++; | |
969 | if (conf->pending_data_cnt >= PENDING_IO_MAX) | |
970 | dispatch_defer_bios(conf, PENDING_IO_ONE_FLUSH, &tmp); | |
971 | ||
765d704d | 972 | spin_unlock(&conf->pending_bios_lock); |
aaf9f12e SL |
973 | |
974 | dispatch_bio_list(&tmp); | |
765d704d SL |
975 | } |
976 | ||
6712ecf8 | 977 | static void |
4246a0b6 | 978 | raid5_end_read_request(struct bio *bi); |
6712ecf8 | 979 | static void |
4246a0b6 | 980 | raid5_end_write_request(struct bio *bi); |
91c00924 | 981 | |
c4e5ac0a | 982 | static void ops_run_io(struct stripe_head *sh, struct stripe_head_state *s) |
91c00924 | 983 | { |
d1688a6d | 984 | struct r5conf *conf = sh->raid_conf; |
91c00924 | 985 | int i, disks = sh->disks; |
59fc630b | 986 | struct stripe_head *head_sh = sh; |
aaf9f12e SL |
987 | struct bio_list pending_bios = BIO_EMPTY_LIST; |
988 | bool should_defer; | |
91c00924 DW |
989 | |
990 | might_sleep(); | |
991 | ||
ff875738 AP |
992 | if (log_stripe(sh, s) == 0) |
993 | return; | |
1e6d690b | 994 | |
aaf9f12e | 995 | should_defer = conf->batch_bio_dispatch && conf->group_cnt; |
1e6d690b | 996 | |
91c00924 | 997 | for (i = disks; i--; ) { |
796a5cf0 | 998 | int op, op_flags = 0; |
9a3e1101 | 999 | int replace_only = 0; |
977df362 N |
1000 | struct bio *bi, *rbi; |
1001 | struct md_rdev *rdev, *rrdev = NULL; | |
59fc630b | 1002 | |
1003 | sh = head_sh; | |
e9c7469b | 1004 | if (test_and_clear_bit(R5_Wantwrite, &sh->dev[i].flags)) { |
796a5cf0 | 1005 | op = REQ_OP_WRITE; |
e9c7469b | 1006 | if (test_and_clear_bit(R5_WantFUA, &sh->dev[i].flags)) |
70fd7614 | 1007 | op_flags = REQ_FUA; |
9e444768 | 1008 | if (test_bit(R5_Discard, &sh->dev[i].flags)) |
796a5cf0 | 1009 | op = REQ_OP_DISCARD; |
e9c7469b | 1010 | } else if (test_and_clear_bit(R5_Wantread, &sh->dev[i].flags)) |
796a5cf0 | 1011 | op = REQ_OP_READ; |
9a3e1101 N |
1012 | else if (test_and_clear_bit(R5_WantReplace, |
1013 | &sh->dev[i].flags)) { | |
796a5cf0 | 1014 | op = REQ_OP_WRITE; |
9a3e1101 N |
1015 | replace_only = 1; |
1016 | } else | |
91c00924 | 1017 | continue; |
bc0934f0 | 1018 | if (test_and_clear_bit(R5_SyncIO, &sh->dev[i].flags)) |
796a5cf0 | 1019 | op_flags |= REQ_SYNC; |
91c00924 | 1020 | |
59fc630b | 1021 | again: |
91c00924 | 1022 | bi = &sh->dev[i].req; |
977df362 | 1023 | rbi = &sh->dev[i].rreq; /* For writing to replacement */ |
91c00924 | 1024 | |
91c00924 | 1025 | rcu_read_lock(); |
9a3e1101 | 1026 | rrdev = rcu_dereference(conf->disks[i].replacement); |
dd054fce N |
1027 | smp_mb(); /* Ensure that if rrdev is NULL, rdev won't be */ |
1028 | rdev = rcu_dereference(conf->disks[i].rdev); | |
1029 | if (!rdev) { | |
1030 | rdev = rrdev; | |
1031 | rrdev = NULL; | |
1032 | } | |
796a5cf0 | 1033 | if (op_is_write(op)) { |
9a3e1101 N |
1034 | if (replace_only) |
1035 | rdev = NULL; | |
dd054fce N |
1036 | if (rdev == rrdev) |
1037 | /* We raced and saw duplicates */ | |
1038 | rrdev = NULL; | |
9a3e1101 | 1039 | } else { |
59fc630b | 1040 | if (test_bit(R5_ReadRepl, &head_sh->dev[i].flags) && rrdev) |
9a3e1101 N |
1041 | rdev = rrdev; |
1042 | rrdev = NULL; | |
1043 | } | |
977df362 | 1044 | |
91c00924 DW |
1045 | if (rdev && test_bit(Faulty, &rdev->flags)) |
1046 | rdev = NULL; | |
1047 | if (rdev) | |
1048 | atomic_inc(&rdev->nr_pending); | |
977df362 N |
1049 | if (rrdev && test_bit(Faulty, &rrdev->flags)) |
1050 | rrdev = NULL; | |
1051 | if (rrdev) | |
1052 | atomic_inc(&rrdev->nr_pending); | |
91c00924 DW |
1053 | rcu_read_unlock(); |
1054 | ||
73e92e51 | 1055 | /* We have already checked bad blocks for reads. Now |
977df362 N |
1056 | * need to check for writes. We never accept write errors |
1057 | * on the replacement, so we don't to check rrdev. | |
73e92e51 | 1058 | */ |
796a5cf0 | 1059 | while (op_is_write(op) && rdev && |
73e92e51 N |
1060 | test_bit(WriteErrorSeen, &rdev->flags)) { |
1061 | sector_t first_bad; | |
1062 | int bad_sectors; | |
1063 | int bad = is_badblock(rdev, sh->sector, STRIPE_SECTORS, | |
1064 | &first_bad, &bad_sectors); | |
1065 | if (!bad) | |
1066 | break; | |
1067 | ||
1068 | if (bad < 0) { | |
1069 | set_bit(BlockedBadBlocks, &rdev->flags); | |
1070 | if (!conf->mddev->external && | |
2953079c | 1071 | conf->mddev->sb_flags) { |
73e92e51 N |
1072 | /* It is very unlikely, but we might |
1073 | * still need to write out the | |
1074 | * bad block log - better give it | |
1075 | * a chance*/ | |
1076 | md_check_recovery(conf->mddev); | |
1077 | } | |
1850753d | 1078 | /* |
1079 | * Because md_wait_for_blocked_rdev | |
1080 | * will dec nr_pending, we must | |
1081 | * increment it first. | |
1082 | */ | |
1083 | atomic_inc(&rdev->nr_pending); | |
73e92e51 N |
1084 | md_wait_for_blocked_rdev(rdev, conf->mddev); |
1085 | } else { | |
1086 | /* Acknowledged bad block - skip the write */ | |
1087 | rdev_dec_pending(rdev, conf->mddev); | |
1088 | rdev = NULL; | |
1089 | } | |
1090 | } | |
1091 | ||
91c00924 | 1092 | if (rdev) { |
9a3e1101 N |
1093 | if (s->syncing || s->expanding || s->expanded |
1094 | || s->replacing) | |
91c00924 DW |
1095 | md_sync_acct(rdev->bdev, STRIPE_SECTORS); |
1096 | ||
2b7497f0 DW |
1097 | set_bit(STRIPE_IO_STARTED, &sh->state); |
1098 | ||
91c00924 | 1099 | bi->bi_bdev = rdev->bdev; |
796a5cf0 MC |
1100 | bio_set_op_attrs(bi, op, op_flags); |
1101 | bi->bi_end_io = op_is_write(op) | |
2f6db2a7 KO |
1102 | ? raid5_end_write_request |
1103 | : raid5_end_read_request; | |
1104 | bi->bi_private = sh; | |
1105 | ||
6296b960 | 1106 | pr_debug("%s: for %llu schedule op %d on disc %d\n", |
e46b272b | 1107 | __func__, (unsigned long long)sh->sector, |
1eff9d32 | 1108 | bi->bi_opf, i); |
91c00924 | 1109 | atomic_inc(&sh->count); |
59fc630b | 1110 | if (sh != head_sh) |
1111 | atomic_inc(&head_sh->count); | |
05616be5 | 1112 | if (use_new_offset(conf, sh)) |
4f024f37 | 1113 | bi->bi_iter.bi_sector = (sh->sector |
05616be5 N |
1114 | + rdev->new_data_offset); |
1115 | else | |
4f024f37 | 1116 | bi->bi_iter.bi_sector = (sh->sector |
05616be5 | 1117 | + rdev->data_offset); |
59fc630b | 1118 | if (test_bit(R5_ReadNoMerge, &head_sh->dev[i].flags)) |
1eff9d32 | 1119 | bi->bi_opf |= REQ_NOMERGE; |
3f9e7c14 | 1120 | |
d592a996 SL |
1121 | if (test_bit(R5_SkipCopy, &sh->dev[i].flags)) |
1122 | WARN_ON(test_bit(R5_UPTODATE, &sh->dev[i].flags)); | |
86aa1397 SL |
1123 | |
1124 | if (!op_is_write(op) && | |
1125 | test_bit(R5_InJournal, &sh->dev[i].flags)) | |
1126 | /* | |
1127 | * issuing read for a page in journal, this | |
1128 | * must be preparing for prexor in rmw; read | |
1129 | * the data into orig_page | |
1130 | */ | |
1131 | sh->dev[i].vec.bv_page = sh->dev[i].orig_page; | |
1132 | else | |
1133 | sh->dev[i].vec.bv_page = sh->dev[i].page; | |
4997b72e | 1134 | bi->bi_vcnt = 1; |
91c00924 DW |
1135 | bi->bi_io_vec[0].bv_len = STRIPE_SIZE; |
1136 | bi->bi_io_vec[0].bv_offset = 0; | |
4f024f37 | 1137 | bi->bi_iter.bi_size = STRIPE_SIZE; |
37c61ff3 SL |
1138 | /* |
1139 | * If this is discard request, set bi_vcnt 0. We don't | |
1140 | * want to confuse SCSI because SCSI will replace payload | |
1141 | */ | |
796a5cf0 | 1142 | if (op == REQ_OP_DISCARD) |
37c61ff3 | 1143 | bi->bi_vcnt = 0; |
977df362 N |
1144 | if (rrdev) |
1145 | set_bit(R5_DOUBLE_LOCKED, &sh->dev[i].flags); | |
e3620a3a JB |
1146 | |
1147 | if (conf->mddev->gendisk) | |
1148 | trace_block_bio_remap(bdev_get_queue(bi->bi_bdev), | |
1149 | bi, disk_devt(conf->mddev->gendisk), | |
1150 | sh->dev[i].sector); | |
aaf9f12e SL |
1151 | if (should_defer && op_is_write(op)) |
1152 | bio_list_add(&pending_bios, bi); | |
1153 | else | |
1154 | generic_make_request(bi); | |
977df362 N |
1155 | } |
1156 | if (rrdev) { | |
9a3e1101 N |
1157 | if (s->syncing || s->expanding || s->expanded |
1158 | || s->replacing) | |
977df362 N |
1159 | md_sync_acct(rrdev->bdev, STRIPE_SECTORS); |
1160 | ||
1161 | set_bit(STRIPE_IO_STARTED, &sh->state); | |
1162 | ||
1163 | rbi->bi_bdev = rrdev->bdev; | |
796a5cf0 MC |
1164 | bio_set_op_attrs(rbi, op, op_flags); |
1165 | BUG_ON(!op_is_write(op)); | |
2f6db2a7 KO |
1166 | rbi->bi_end_io = raid5_end_write_request; |
1167 | rbi->bi_private = sh; | |
1168 | ||
6296b960 | 1169 | pr_debug("%s: for %llu schedule op %d on " |
977df362 N |
1170 | "replacement disc %d\n", |
1171 | __func__, (unsigned long long)sh->sector, | |
1eff9d32 | 1172 | rbi->bi_opf, i); |
977df362 | 1173 | atomic_inc(&sh->count); |
59fc630b | 1174 | if (sh != head_sh) |
1175 | atomic_inc(&head_sh->count); | |
05616be5 | 1176 | if (use_new_offset(conf, sh)) |
4f024f37 | 1177 | rbi->bi_iter.bi_sector = (sh->sector |
05616be5 N |
1178 | + rrdev->new_data_offset); |
1179 | else | |
4f024f37 | 1180 | rbi->bi_iter.bi_sector = (sh->sector |
05616be5 | 1181 | + rrdev->data_offset); |
d592a996 SL |
1182 | if (test_bit(R5_SkipCopy, &sh->dev[i].flags)) |
1183 | WARN_ON(test_bit(R5_UPTODATE, &sh->dev[i].flags)); | |
1184 | sh->dev[i].rvec.bv_page = sh->dev[i].page; | |
4997b72e | 1185 | rbi->bi_vcnt = 1; |
977df362 N |
1186 | rbi->bi_io_vec[0].bv_len = STRIPE_SIZE; |
1187 | rbi->bi_io_vec[0].bv_offset = 0; | |
4f024f37 | 1188 | rbi->bi_iter.bi_size = STRIPE_SIZE; |
37c61ff3 SL |
1189 | /* |
1190 | * If this is discard request, set bi_vcnt 0. We don't | |
1191 | * want to confuse SCSI because SCSI will replace payload | |
1192 | */ | |
796a5cf0 | 1193 | if (op == REQ_OP_DISCARD) |
37c61ff3 | 1194 | rbi->bi_vcnt = 0; |
e3620a3a JB |
1195 | if (conf->mddev->gendisk) |
1196 | trace_block_bio_remap(bdev_get_queue(rbi->bi_bdev), | |
1197 | rbi, disk_devt(conf->mddev->gendisk), | |
1198 | sh->dev[i].sector); | |
aaf9f12e SL |
1199 | if (should_defer && op_is_write(op)) |
1200 | bio_list_add(&pending_bios, rbi); | |
1201 | else | |
1202 | generic_make_request(rbi); | |
977df362 N |
1203 | } |
1204 | if (!rdev && !rrdev) { | |
796a5cf0 | 1205 | if (op_is_write(op)) |
91c00924 | 1206 | set_bit(STRIPE_DEGRADED, &sh->state); |
6296b960 | 1207 | pr_debug("skip op %d on disc %d for sector %llu\n", |
1eff9d32 | 1208 | bi->bi_opf, i, (unsigned long long)sh->sector); |
91c00924 DW |
1209 | clear_bit(R5_LOCKED, &sh->dev[i].flags); |
1210 | set_bit(STRIPE_HANDLE, &sh->state); | |
1211 | } | |
59fc630b | 1212 | |
1213 | if (!head_sh->batch_head) | |
1214 | continue; | |
1215 | sh = list_first_entry(&sh->batch_list, struct stripe_head, | |
1216 | batch_list); | |
1217 | if (sh != head_sh) | |
1218 | goto again; | |
91c00924 | 1219 | } |
aaf9f12e SL |
1220 | |
1221 | if (should_defer && !bio_list_empty(&pending_bios)) | |
1222 | defer_issue_bios(conf, head_sh->sector, &pending_bios); | |
91c00924 DW |
1223 | } |
1224 | ||
1225 | static struct dma_async_tx_descriptor * | |
d592a996 SL |
1226 | async_copy_data(int frombio, struct bio *bio, struct page **page, |
1227 | sector_t sector, struct dma_async_tx_descriptor *tx, | |
1e6d690b | 1228 | struct stripe_head *sh, int no_skipcopy) |
91c00924 | 1229 | { |
7988613b KO |
1230 | struct bio_vec bvl; |
1231 | struct bvec_iter iter; | |
91c00924 | 1232 | struct page *bio_page; |
91c00924 | 1233 | int page_offset; |
a08abd8c | 1234 | struct async_submit_ctl submit; |
0403e382 | 1235 | enum async_tx_flags flags = 0; |
91c00924 | 1236 | |
4f024f37 KO |
1237 | if (bio->bi_iter.bi_sector >= sector) |
1238 | page_offset = (signed)(bio->bi_iter.bi_sector - sector) * 512; | |
91c00924 | 1239 | else |
4f024f37 | 1240 | page_offset = (signed)(sector - bio->bi_iter.bi_sector) * -512; |
a08abd8c | 1241 | |
0403e382 DW |
1242 | if (frombio) |
1243 | flags |= ASYNC_TX_FENCE; | |
1244 | init_async_submit(&submit, flags, tx, NULL, NULL, NULL); | |
1245 | ||
7988613b KO |
1246 | bio_for_each_segment(bvl, bio, iter) { |
1247 | int len = bvl.bv_len; | |
91c00924 DW |
1248 | int clen; |
1249 | int b_offset = 0; | |
1250 | ||
1251 | if (page_offset < 0) { | |
1252 | b_offset = -page_offset; | |
1253 | page_offset += b_offset; | |
1254 | len -= b_offset; | |
1255 | } | |
1256 | ||
1257 | if (len > 0 && page_offset + len > STRIPE_SIZE) | |
1258 | clen = STRIPE_SIZE - page_offset; | |
1259 | else | |
1260 | clen = len; | |
1261 | ||
1262 | if (clen > 0) { | |
7988613b KO |
1263 | b_offset += bvl.bv_offset; |
1264 | bio_page = bvl.bv_page; | |
d592a996 SL |
1265 | if (frombio) { |
1266 | if (sh->raid_conf->skip_copy && | |
1267 | b_offset == 0 && page_offset == 0 && | |
1e6d690b SL |
1268 | clen == STRIPE_SIZE && |
1269 | !no_skipcopy) | |
d592a996 SL |
1270 | *page = bio_page; |
1271 | else | |
1272 | tx = async_memcpy(*page, bio_page, page_offset, | |
a08abd8c | 1273 | b_offset, clen, &submit); |
d592a996 SL |
1274 | } else |
1275 | tx = async_memcpy(bio_page, *page, b_offset, | |
a08abd8c | 1276 | page_offset, clen, &submit); |
91c00924 | 1277 | } |
a08abd8c DW |
1278 | /* chain the operations */ |
1279 | submit.depend_tx = tx; | |
1280 | ||
91c00924 DW |
1281 | if (clen < len) /* hit end of page */ |
1282 | break; | |
1283 | page_offset += len; | |
1284 | } | |
1285 | ||
1286 | return tx; | |
1287 | } | |
1288 | ||
1289 | static void ops_complete_biofill(void *stripe_head_ref) | |
1290 | { | |
1291 | struct stripe_head *sh = stripe_head_ref; | |
e4d84909 | 1292 | int i; |
91c00924 | 1293 | |
e46b272b | 1294 | pr_debug("%s: stripe %llu\n", __func__, |
91c00924 DW |
1295 | (unsigned long long)sh->sector); |
1296 | ||
1297 | /* clear completed biofills */ | |
1298 | for (i = sh->disks; i--; ) { | |
1299 | struct r5dev *dev = &sh->dev[i]; | |
91c00924 DW |
1300 | |
1301 | /* acknowledge completion of a biofill operation */ | |
e4d84909 DW |
1302 | /* and check if we need to reply to a read request, |
1303 | * new R5_Wantfill requests are held off until | |
83de75cc | 1304 | * !STRIPE_BIOFILL_RUN |
e4d84909 DW |
1305 | */ |
1306 | if (test_and_clear_bit(R5_Wantfill, &dev->flags)) { | |
91c00924 | 1307 | struct bio *rbi, *rbi2; |
91c00924 | 1308 | |
91c00924 DW |
1309 | BUG_ON(!dev->read); |
1310 | rbi = dev->read; | |
1311 | dev->read = NULL; | |
4f024f37 | 1312 | while (rbi && rbi->bi_iter.bi_sector < |
91c00924 DW |
1313 | dev->sector + STRIPE_SECTORS) { |
1314 | rbi2 = r5_next_bio(rbi, dev->sector); | |
016c76ac | 1315 | bio_endio(rbi); |
91c00924 DW |
1316 | rbi = rbi2; |
1317 | } | |
1318 | } | |
1319 | } | |
83de75cc | 1320 | clear_bit(STRIPE_BIOFILL_RUN, &sh->state); |
91c00924 | 1321 | |
e4d84909 | 1322 | set_bit(STRIPE_HANDLE, &sh->state); |
6d036f7d | 1323 | raid5_release_stripe(sh); |
91c00924 DW |
1324 | } |
1325 | ||
1326 | static void ops_run_biofill(struct stripe_head *sh) | |
1327 | { | |
1328 | struct dma_async_tx_descriptor *tx = NULL; | |
a08abd8c | 1329 | struct async_submit_ctl submit; |
91c00924 DW |
1330 | int i; |
1331 | ||
59fc630b | 1332 | BUG_ON(sh->batch_head); |
e46b272b | 1333 | pr_debug("%s: stripe %llu\n", __func__, |
91c00924 DW |
1334 | (unsigned long long)sh->sector); |
1335 | ||
1336 | for (i = sh->disks; i--; ) { | |
1337 | struct r5dev *dev = &sh->dev[i]; | |
1338 | if (test_bit(R5_Wantfill, &dev->flags)) { | |
1339 | struct bio *rbi; | |
b17459c0 | 1340 | spin_lock_irq(&sh->stripe_lock); |
91c00924 DW |
1341 | dev->read = rbi = dev->toread; |
1342 | dev->toread = NULL; | |
b17459c0 | 1343 | spin_unlock_irq(&sh->stripe_lock); |
4f024f37 | 1344 | while (rbi && rbi->bi_iter.bi_sector < |
91c00924 | 1345 | dev->sector + STRIPE_SECTORS) { |
d592a996 | 1346 | tx = async_copy_data(0, rbi, &dev->page, |
1e6d690b | 1347 | dev->sector, tx, sh, 0); |
91c00924 DW |
1348 | rbi = r5_next_bio(rbi, dev->sector); |
1349 | } | |
1350 | } | |
1351 | } | |
1352 | ||
1353 | atomic_inc(&sh->count); | |
a08abd8c DW |
1354 | init_async_submit(&submit, ASYNC_TX_ACK, tx, ops_complete_biofill, sh, NULL); |
1355 | async_trigger_callback(&submit); | |
91c00924 DW |
1356 | } |
1357 | ||
4e7d2c0a | 1358 | static void mark_target_uptodate(struct stripe_head *sh, int target) |
91c00924 | 1359 | { |
4e7d2c0a | 1360 | struct r5dev *tgt; |
91c00924 | 1361 | |
4e7d2c0a DW |
1362 | if (target < 0) |
1363 | return; | |
91c00924 | 1364 | |
4e7d2c0a | 1365 | tgt = &sh->dev[target]; |
91c00924 DW |
1366 | set_bit(R5_UPTODATE, &tgt->flags); |
1367 | BUG_ON(!test_bit(R5_Wantcompute, &tgt->flags)); | |
1368 | clear_bit(R5_Wantcompute, &tgt->flags); | |
4e7d2c0a DW |
1369 | } |
1370 | ||
ac6b53b6 | 1371 | static void ops_complete_compute(void *stripe_head_ref) |
91c00924 DW |
1372 | { |
1373 | struct stripe_head *sh = stripe_head_ref; | |
91c00924 | 1374 | |
e46b272b | 1375 | pr_debug("%s: stripe %llu\n", __func__, |
91c00924 DW |
1376 | (unsigned long long)sh->sector); |
1377 | ||
ac6b53b6 | 1378 | /* mark the computed target(s) as uptodate */ |
4e7d2c0a | 1379 | mark_target_uptodate(sh, sh->ops.target); |
ac6b53b6 | 1380 | mark_target_uptodate(sh, sh->ops.target2); |
4e7d2c0a | 1381 | |
ecc65c9b DW |
1382 | clear_bit(STRIPE_COMPUTE_RUN, &sh->state); |
1383 | if (sh->check_state == check_state_compute_run) | |
1384 | sh->check_state = check_state_compute_result; | |
91c00924 | 1385 | set_bit(STRIPE_HANDLE, &sh->state); |
6d036f7d | 1386 | raid5_release_stripe(sh); |
91c00924 DW |
1387 | } |
1388 | ||
d6f38f31 DW |
1389 | /* return a pointer to the address conversion region of the scribble buffer */ |
1390 | static addr_conv_t *to_addr_conv(struct stripe_head *sh, | |
46d5b785 | 1391 | struct raid5_percpu *percpu, int i) |
d6f38f31 | 1392 | { |
46d5b785 | 1393 | void *addr; |
1394 | ||
1395 | addr = flex_array_get(percpu->scribble, i); | |
1396 | return addr + sizeof(struct page *) * (sh->disks + 2); | |
1397 | } | |
1398 | ||
1399 | /* return a pointer to the address conversion region of the scribble buffer */ | |
1400 | static struct page **to_addr_page(struct raid5_percpu *percpu, int i) | |
1401 | { | |
1402 | void *addr; | |
1403 | ||
1404 | addr = flex_array_get(percpu->scribble, i); | |
1405 | return addr; | |
d6f38f31 DW |
1406 | } |
1407 | ||
1408 | static struct dma_async_tx_descriptor * | |
1409 | ops_run_compute5(struct stripe_head *sh, struct raid5_percpu *percpu) | |
91c00924 | 1410 | { |
91c00924 | 1411 | int disks = sh->disks; |
46d5b785 | 1412 | struct page **xor_srcs = to_addr_page(percpu, 0); |
91c00924 DW |
1413 | int target = sh->ops.target; |
1414 | struct r5dev *tgt = &sh->dev[target]; | |
1415 | struct page *xor_dest = tgt->page; | |
1416 | int count = 0; | |
1417 | struct dma_async_tx_descriptor *tx; | |
a08abd8c | 1418 | struct async_submit_ctl submit; |
91c00924 DW |
1419 | int i; |
1420 | ||
59fc630b | 1421 | BUG_ON(sh->batch_head); |
1422 | ||
91c00924 | 1423 | pr_debug("%s: stripe %llu block: %d\n", |
e46b272b | 1424 | __func__, (unsigned long long)sh->sector, target); |
91c00924 DW |
1425 | BUG_ON(!test_bit(R5_Wantcompute, &tgt->flags)); |
1426 | ||
1427 | for (i = disks; i--; ) | |
1428 | if (i != target) | |
1429 | xor_srcs[count++] = sh->dev[i].page; | |
1430 | ||
1431 | atomic_inc(&sh->count); | |
1432 | ||
0403e382 | 1433 | init_async_submit(&submit, ASYNC_TX_FENCE|ASYNC_TX_XOR_ZERO_DST, NULL, |
46d5b785 | 1434 | ops_complete_compute, sh, to_addr_conv(sh, percpu, 0)); |
91c00924 | 1435 | if (unlikely(count == 1)) |
a08abd8c | 1436 | tx = async_memcpy(xor_dest, xor_srcs[0], 0, 0, STRIPE_SIZE, &submit); |
91c00924 | 1437 | else |
a08abd8c | 1438 | tx = async_xor(xor_dest, xor_srcs, 0, count, STRIPE_SIZE, &submit); |
91c00924 | 1439 | |
91c00924 DW |
1440 | return tx; |
1441 | } | |
1442 | ||
ac6b53b6 DW |
1443 | /* set_syndrome_sources - populate source buffers for gen_syndrome |
1444 | * @srcs - (struct page *) array of size sh->disks | |
1445 | * @sh - stripe_head to parse | |
1446 | * | |
1447 | * Populates srcs in proper layout order for the stripe and returns the | |
1448 | * 'count' of sources to be used in a call to async_gen_syndrome. The P | |
1449 | * destination buffer is recorded in srcs[count] and the Q destination | |
1450 | * is recorded in srcs[count+1]]. | |
1451 | */ | |
584acdd4 MS |
1452 | static int set_syndrome_sources(struct page **srcs, |
1453 | struct stripe_head *sh, | |
1454 | int srctype) | |
ac6b53b6 DW |
1455 | { |
1456 | int disks = sh->disks; | |
1457 | int syndrome_disks = sh->ddf_layout ? disks : (disks - 2); | |
1458 | int d0_idx = raid6_d0(sh); | |
1459 | int count; | |
1460 | int i; | |
1461 | ||
1462 | for (i = 0; i < disks; i++) | |
5dd33c9a | 1463 | srcs[i] = NULL; |
ac6b53b6 DW |
1464 | |
1465 | count = 0; | |
1466 | i = d0_idx; | |
1467 | do { | |
1468 | int slot = raid6_idx_to_slot(i, sh, &count, syndrome_disks); | |
584acdd4 | 1469 | struct r5dev *dev = &sh->dev[i]; |
ac6b53b6 | 1470 | |
584acdd4 MS |
1471 | if (i == sh->qd_idx || i == sh->pd_idx || |
1472 | (srctype == SYNDROME_SRC_ALL) || | |
1473 | (srctype == SYNDROME_SRC_WANT_DRAIN && | |
1e6d690b SL |
1474 | (test_bit(R5_Wantdrain, &dev->flags) || |
1475 | test_bit(R5_InJournal, &dev->flags))) || | |
584acdd4 | 1476 | (srctype == SYNDROME_SRC_WRITTEN && |
0977762f SL |
1477 | (dev->written || |
1478 | test_bit(R5_InJournal, &dev->flags)))) { | |
1e6d690b SL |
1479 | if (test_bit(R5_InJournal, &dev->flags)) |
1480 | srcs[slot] = sh->dev[i].orig_page; | |
1481 | else | |
1482 | srcs[slot] = sh->dev[i].page; | |
1483 | } | |
ac6b53b6 DW |
1484 | i = raid6_next_disk(i, disks); |
1485 | } while (i != d0_idx); | |
ac6b53b6 | 1486 | |
e4424fee | 1487 | return syndrome_disks; |
ac6b53b6 DW |
1488 | } |
1489 | ||
1490 | static struct dma_async_tx_descriptor * | |
1491 | ops_run_compute6_1(struct stripe_head *sh, struct raid5_percpu *percpu) | |
1492 | { | |
1493 | int disks = sh->disks; | |
46d5b785 | 1494 | struct page **blocks = to_addr_page(percpu, 0); |
ac6b53b6 DW |
1495 | int target; |
1496 | int qd_idx = sh->qd_idx; | |
1497 | struct dma_async_tx_descriptor *tx; | |
1498 | struct async_submit_ctl submit; | |
1499 | struct r5dev *tgt; | |
1500 | struct page *dest; | |
1501 | int i; | |
1502 | int count; | |
1503 | ||
59fc630b | 1504 | BUG_ON(sh->batch_head); |
ac6b53b6 DW |
1505 | if (sh->ops.target < 0) |
1506 | target = sh->ops.target2; | |
1507 | else if (sh->ops.target2 < 0) | |
1508 | target = sh->ops.target; | |
91c00924 | 1509 | else |
ac6b53b6 DW |
1510 | /* we should only have one valid target */ |
1511 | BUG(); | |
1512 | BUG_ON(target < 0); | |
1513 | pr_debug("%s: stripe %llu block: %d\n", | |
1514 | __func__, (unsigned long long)sh->sector, target); | |
1515 | ||
1516 | tgt = &sh->dev[target]; | |
1517 | BUG_ON(!test_bit(R5_Wantcompute, &tgt->flags)); | |
1518 | dest = tgt->page; | |
1519 | ||
1520 | atomic_inc(&sh->count); | |
1521 | ||
1522 | if (target == qd_idx) { | |
584acdd4 | 1523 | count = set_syndrome_sources(blocks, sh, SYNDROME_SRC_ALL); |
ac6b53b6 DW |
1524 | blocks[count] = NULL; /* regenerating p is not necessary */ |
1525 | BUG_ON(blocks[count+1] != dest); /* q should already be set */ | |
0403e382 DW |
1526 | init_async_submit(&submit, ASYNC_TX_FENCE, NULL, |
1527 | ops_complete_compute, sh, | |
46d5b785 | 1528 | to_addr_conv(sh, percpu, 0)); |
ac6b53b6 DW |
1529 | tx = async_gen_syndrome(blocks, 0, count+2, STRIPE_SIZE, &submit); |
1530 | } else { | |
1531 | /* Compute any data- or p-drive using XOR */ | |
1532 | count = 0; | |
1533 | for (i = disks; i-- ; ) { | |
1534 | if (i == target || i == qd_idx) | |
1535 | continue; | |
1536 | blocks[count++] = sh->dev[i].page; | |
1537 | } | |
1538 | ||
0403e382 DW |
1539 | init_async_submit(&submit, ASYNC_TX_FENCE|ASYNC_TX_XOR_ZERO_DST, |
1540 | NULL, ops_complete_compute, sh, | |
46d5b785 | 1541 | to_addr_conv(sh, percpu, 0)); |
ac6b53b6 DW |
1542 | tx = async_xor(dest, blocks, 0, count, STRIPE_SIZE, &submit); |
1543 | } | |
91c00924 | 1544 | |
91c00924 DW |
1545 | return tx; |
1546 | } | |
1547 | ||
ac6b53b6 DW |
1548 | static struct dma_async_tx_descriptor * |
1549 | ops_run_compute6_2(struct stripe_head *sh, struct raid5_percpu *percpu) | |
1550 | { | |
1551 | int i, count, disks = sh->disks; | |
1552 | int syndrome_disks = sh->ddf_layout ? disks : disks-2; | |
1553 | int d0_idx = raid6_d0(sh); | |
1554 | int faila = -1, failb = -1; | |
1555 | int target = sh->ops.target; | |
1556 | int target2 = sh->ops.target2; | |
1557 | struct r5dev *tgt = &sh->dev[target]; | |
1558 | struct r5dev *tgt2 = &sh->dev[target2]; | |
1559 | struct dma_async_tx_descriptor *tx; | |
46d5b785 | 1560 | struct page **blocks = to_addr_page(percpu, 0); |
ac6b53b6 DW |
1561 | struct async_submit_ctl submit; |
1562 | ||
59fc630b | 1563 | BUG_ON(sh->batch_head); |
ac6b53b6 DW |
1564 | pr_debug("%s: stripe %llu block1: %d block2: %d\n", |
1565 | __func__, (unsigned long long)sh->sector, target, target2); | |
1566 | BUG_ON(target < 0 || target2 < 0); | |
1567 | BUG_ON(!test_bit(R5_Wantcompute, &tgt->flags)); | |
1568 | BUG_ON(!test_bit(R5_Wantcompute, &tgt2->flags)); | |
1569 | ||
6c910a78 | 1570 | /* we need to open-code set_syndrome_sources to handle the |
ac6b53b6 DW |
1571 | * slot number conversion for 'faila' and 'failb' |
1572 | */ | |
1573 | for (i = 0; i < disks ; i++) | |
5dd33c9a | 1574 | blocks[i] = NULL; |
ac6b53b6 DW |
1575 | count = 0; |
1576 | i = d0_idx; | |
1577 | do { | |
1578 | int slot = raid6_idx_to_slot(i, sh, &count, syndrome_disks); | |
1579 | ||
1580 | blocks[slot] = sh->dev[i].page; | |
1581 | ||
1582 | if (i == target) | |
1583 | faila = slot; | |
1584 | if (i == target2) | |
1585 | failb = slot; | |
1586 | i = raid6_next_disk(i, disks); | |
1587 | } while (i != d0_idx); | |
ac6b53b6 DW |
1588 | |
1589 | BUG_ON(faila == failb); | |
1590 | if (failb < faila) | |
1591 | swap(faila, failb); | |
1592 | pr_debug("%s: stripe: %llu faila: %d failb: %d\n", | |
1593 | __func__, (unsigned long long)sh->sector, faila, failb); | |
1594 | ||
1595 | atomic_inc(&sh->count); | |
1596 | ||
1597 | if (failb == syndrome_disks+1) { | |
1598 | /* Q disk is one of the missing disks */ | |
1599 | if (faila == syndrome_disks) { | |
1600 | /* Missing P+Q, just recompute */ | |
0403e382 DW |
1601 | init_async_submit(&submit, ASYNC_TX_FENCE, NULL, |
1602 | ops_complete_compute, sh, | |
46d5b785 | 1603 | to_addr_conv(sh, percpu, 0)); |
e4424fee | 1604 | return async_gen_syndrome(blocks, 0, syndrome_disks+2, |
ac6b53b6 DW |
1605 | STRIPE_SIZE, &submit); |
1606 | } else { | |
1607 | struct page *dest; | |
1608 | int data_target; | |
1609 | int qd_idx = sh->qd_idx; | |
1610 | ||
1611 | /* Missing D+Q: recompute D from P, then recompute Q */ | |
1612 | if (target == qd_idx) | |
1613 | data_target = target2; | |
1614 | else | |
1615 | data_target = target; | |
1616 | ||
1617 | count = 0; | |
1618 | for (i = disks; i-- ; ) { | |
1619 | if (i == data_target || i == qd_idx) | |
1620 | continue; | |
1621 | blocks[count++] = sh->dev[i].page; | |
1622 | } | |
1623 | dest = sh->dev[data_target].page; | |
0403e382 DW |
1624 | init_async_submit(&submit, |
1625 | ASYNC_TX_FENCE|ASYNC_TX_XOR_ZERO_DST, | |
1626 | NULL, NULL, NULL, | |
46d5b785 | 1627 | to_addr_conv(sh, percpu, 0)); |
ac6b53b6 DW |
1628 | tx = async_xor(dest, blocks, 0, count, STRIPE_SIZE, |
1629 | &submit); | |
1630 | ||
584acdd4 | 1631 | count = set_syndrome_sources(blocks, sh, SYNDROME_SRC_ALL); |
0403e382 DW |
1632 | init_async_submit(&submit, ASYNC_TX_FENCE, tx, |
1633 | ops_complete_compute, sh, | |
46d5b785 | 1634 | to_addr_conv(sh, percpu, 0)); |
ac6b53b6 DW |
1635 | return async_gen_syndrome(blocks, 0, count+2, |
1636 | STRIPE_SIZE, &submit); | |
1637 | } | |
ac6b53b6 | 1638 | } else { |
6c910a78 DW |
1639 | init_async_submit(&submit, ASYNC_TX_FENCE, NULL, |
1640 | ops_complete_compute, sh, | |
46d5b785 | 1641 | to_addr_conv(sh, percpu, 0)); |
6c910a78 DW |
1642 | if (failb == syndrome_disks) { |
1643 | /* We're missing D+P. */ | |
1644 | return async_raid6_datap_recov(syndrome_disks+2, | |
1645 | STRIPE_SIZE, faila, | |
1646 | blocks, &submit); | |
1647 | } else { | |
1648 | /* We're missing D+D. */ | |
1649 | return async_raid6_2data_recov(syndrome_disks+2, | |
1650 | STRIPE_SIZE, faila, failb, | |
1651 | blocks, &submit); | |
1652 | } | |
ac6b53b6 DW |
1653 | } |
1654 | } | |
1655 | ||
91c00924 DW |
1656 | static void ops_complete_prexor(void *stripe_head_ref) |
1657 | { | |
1658 | struct stripe_head *sh = stripe_head_ref; | |
1659 | ||
e46b272b | 1660 | pr_debug("%s: stripe %llu\n", __func__, |
91c00924 | 1661 | (unsigned long long)sh->sector); |
1e6d690b SL |
1662 | |
1663 | if (r5c_is_writeback(sh->raid_conf->log)) | |
1664 | /* | |
1665 | * raid5-cache write back uses orig_page during prexor. | |
1666 | * After prexor, it is time to free orig_page | |
1667 | */ | |
1668 | r5c_release_extra_page(sh); | |
91c00924 DW |
1669 | } |
1670 | ||
1671 | static struct dma_async_tx_descriptor * | |
584acdd4 MS |
1672 | ops_run_prexor5(struct stripe_head *sh, struct raid5_percpu *percpu, |
1673 | struct dma_async_tx_descriptor *tx) | |
91c00924 | 1674 | { |
91c00924 | 1675 | int disks = sh->disks; |
46d5b785 | 1676 | struct page **xor_srcs = to_addr_page(percpu, 0); |
91c00924 | 1677 | int count = 0, pd_idx = sh->pd_idx, i; |
a08abd8c | 1678 | struct async_submit_ctl submit; |
91c00924 DW |
1679 | |
1680 | /* existing parity data subtracted */ | |
1681 | struct page *xor_dest = xor_srcs[count++] = sh->dev[pd_idx].page; | |
1682 | ||
59fc630b | 1683 | BUG_ON(sh->batch_head); |
e46b272b | 1684 | pr_debug("%s: stripe %llu\n", __func__, |
91c00924 DW |
1685 | (unsigned long long)sh->sector); |
1686 | ||
1687 | for (i = disks; i--; ) { | |
1688 | struct r5dev *dev = &sh->dev[i]; | |
1689 | /* Only process blocks that are known to be uptodate */ | |
1e6d690b SL |
1690 | if (test_bit(R5_InJournal, &dev->flags)) |
1691 | xor_srcs[count++] = dev->orig_page; | |
1692 | else if (test_bit(R5_Wantdrain, &dev->flags)) | |
91c00924 DW |
1693 | xor_srcs[count++] = dev->page; |
1694 | } | |
1695 | ||
0403e382 | 1696 | init_async_submit(&submit, ASYNC_TX_FENCE|ASYNC_TX_XOR_DROP_DST, tx, |
46d5b785 | 1697 | ops_complete_prexor, sh, to_addr_conv(sh, percpu, 0)); |
a08abd8c | 1698 | tx = async_xor(xor_dest, xor_srcs, 0, count, STRIPE_SIZE, &submit); |
91c00924 DW |
1699 | |
1700 | return tx; | |
1701 | } | |
1702 | ||
584acdd4 MS |
1703 | static struct dma_async_tx_descriptor * |
1704 | ops_run_prexor6(struct stripe_head *sh, struct raid5_percpu *percpu, | |
1705 | struct dma_async_tx_descriptor *tx) | |
1706 | { | |
1707 | struct page **blocks = to_addr_page(percpu, 0); | |
1708 | int count; | |
1709 | struct async_submit_ctl submit; | |
1710 | ||
1711 | pr_debug("%s: stripe %llu\n", __func__, | |
1712 | (unsigned long long)sh->sector); | |
1713 | ||
1714 | count = set_syndrome_sources(blocks, sh, SYNDROME_SRC_WANT_DRAIN); | |
1715 | ||
1716 | init_async_submit(&submit, ASYNC_TX_FENCE|ASYNC_TX_PQ_XOR_DST, tx, | |
1717 | ops_complete_prexor, sh, to_addr_conv(sh, percpu, 0)); | |
1718 | tx = async_gen_syndrome(blocks, 0, count+2, STRIPE_SIZE, &submit); | |
1719 | ||
1720 | return tx; | |
1721 | } | |
1722 | ||
91c00924 | 1723 | static struct dma_async_tx_descriptor * |
d8ee0728 | 1724 | ops_run_biodrain(struct stripe_head *sh, struct dma_async_tx_descriptor *tx) |
91c00924 | 1725 | { |
1e6d690b | 1726 | struct r5conf *conf = sh->raid_conf; |
91c00924 | 1727 | int disks = sh->disks; |
d8ee0728 | 1728 | int i; |
59fc630b | 1729 | struct stripe_head *head_sh = sh; |
91c00924 | 1730 | |
e46b272b | 1731 | pr_debug("%s: stripe %llu\n", __func__, |
91c00924 DW |
1732 | (unsigned long long)sh->sector); |
1733 | ||
1734 | for (i = disks; i--; ) { | |
59fc630b | 1735 | struct r5dev *dev; |
91c00924 | 1736 | struct bio *chosen; |
91c00924 | 1737 | |
59fc630b | 1738 | sh = head_sh; |
1739 | if (test_and_clear_bit(R5_Wantdrain, &head_sh->dev[i].flags)) { | |
91c00924 DW |
1740 | struct bio *wbi; |
1741 | ||
59fc630b | 1742 | again: |
1743 | dev = &sh->dev[i]; | |
1e6d690b SL |
1744 | /* |
1745 | * clear R5_InJournal, so when rewriting a page in | |
1746 | * journal, it is not skipped by r5l_log_stripe() | |
1747 | */ | |
1748 | clear_bit(R5_InJournal, &dev->flags); | |
b17459c0 | 1749 | spin_lock_irq(&sh->stripe_lock); |
91c00924 DW |
1750 | chosen = dev->towrite; |
1751 | dev->towrite = NULL; | |
7a87f434 | 1752 | sh->overwrite_disks = 0; |
91c00924 DW |
1753 | BUG_ON(dev->written); |
1754 | wbi = dev->written = chosen; | |
b17459c0 | 1755 | spin_unlock_irq(&sh->stripe_lock); |
d592a996 | 1756 | WARN_ON(dev->page != dev->orig_page); |
91c00924 | 1757 | |
4f024f37 | 1758 | while (wbi && wbi->bi_iter.bi_sector < |
91c00924 | 1759 | dev->sector + STRIPE_SECTORS) { |
1eff9d32 | 1760 | if (wbi->bi_opf & REQ_FUA) |
e9c7469b | 1761 | set_bit(R5_WantFUA, &dev->flags); |
1eff9d32 | 1762 | if (wbi->bi_opf & REQ_SYNC) |
bc0934f0 | 1763 | set_bit(R5_SyncIO, &dev->flags); |
796a5cf0 | 1764 | if (bio_op(wbi) == REQ_OP_DISCARD) |
620125f2 | 1765 | set_bit(R5_Discard, &dev->flags); |
d592a996 SL |
1766 | else { |
1767 | tx = async_copy_data(1, wbi, &dev->page, | |
1e6d690b SL |
1768 | dev->sector, tx, sh, |
1769 | r5c_is_writeback(conf->log)); | |
1770 | if (dev->page != dev->orig_page && | |
1771 | !r5c_is_writeback(conf->log)) { | |
d592a996 SL |
1772 | set_bit(R5_SkipCopy, &dev->flags); |
1773 | clear_bit(R5_UPTODATE, &dev->flags); | |
1774 | clear_bit(R5_OVERWRITE, &dev->flags); | |
1775 | } | |
1776 | } | |
91c00924 DW |
1777 | wbi = r5_next_bio(wbi, dev->sector); |
1778 | } | |
59fc630b | 1779 | |
1780 | if (head_sh->batch_head) { | |
1781 | sh = list_first_entry(&sh->batch_list, | |
1782 | struct stripe_head, | |
1783 | batch_list); | |
1784 | if (sh == head_sh) | |
1785 | continue; | |
1786 | goto again; | |
1787 | } | |
91c00924 DW |
1788 | } |
1789 | } | |
1790 | ||
1791 | return tx; | |
1792 | } | |
1793 | ||
ac6b53b6 | 1794 | static void ops_complete_reconstruct(void *stripe_head_ref) |
91c00924 DW |
1795 | { |
1796 | struct stripe_head *sh = stripe_head_ref; | |
ac6b53b6 DW |
1797 | int disks = sh->disks; |
1798 | int pd_idx = sh->pd_idx; | |
1799 | int qd_idx = sh->qd_idx; | |
1800 | int i; | |
9e444768 | 1801 | bool fua = false, sync = false, discard = false; |
91c00924 | 1802 | |
e46b272b | 1803 | pr_debug("%s: stripe %llu\n", __func__, |
91c00924 DW |
1804 | (unsigned long long)sh->sector); |
1805 | ||
bc0934f0 | 1806 | for (i = disks; i--; ) { |
e9c7469b | 1807 | fua |= test_bit(R5_WantFUA, &sh->dev[i].flags); |
bc0934f0 | 1808 | sync |= test_bit(R5_SyncIO, &sh->dev[i].flags); |
9e444768 | 1809 | discard |= test_bit(R5_Discard, &sh->dev[i].flags); |
bc0934f0 | 1810 | } |
e9c7469b | 1811 | |
91c00924 DW |
1812 | for (i = disks; i--; ) { |
1813 | struct r5dev *dev = &sh->dev[i]; | |
ac6b53b6 | 1814 | |
e9c7469b | 1815 | if (dev->written || i == pd_idx || i == qd_idx) { |
d592a996 | 1816 | if (!discard && !test_bit(R5_SkipCopy, &dev->flags)) |
9e444768 | 1817 | set_bit(R5_UPTODATE, &dev->flags); |
e9c7469b TH |
1818 | if (fua) |
1819 | set_bit(R5_WantFUA, &dev->flags); | |
bc0934f0 SL |
1820 | if (sync) |
1821 | set_bit(R5_SyncIO, &dev->flags); | |
e9c7469b | 1822 | } |
91c00924 DW |
1823 | } |
1824 | ||
d8ee0728 DW |
1825 | if (sh->reconstruct_state == reconstruct_state_drain_run) |
1826 | sh->reconstruct_state = reconstruct_state_drain_result; | |
1827 | else if (sh->reconstruct_state == reconstruct_state_prexor_drain_run) | |
1828 | sh->reconstruct_state = reconstruct_state_prexor_drain_result; | |
1829 | else { | |
1830 | BUG_ON(sh->reconstruct_state != reconstruct_state_run); | |
1831 | sh->reconstruct_state = reconstruct_state_result; | |
1832 | } | |
91c00924 DW |
1833 | |
1834 | set_bit(STRIPE_HANDLE, &sh->state); | |
6d036f7d | 1835 | raid5_release_stripe(sh); |
91c00924 DW |
1836 | } |
1837 | ||
1838 | static void | |
ac6b53b6 DW |
1839 | ops_run_reconstruct5(struct stripe_head *sh, struct raid5_percpu *percpu, |
1840 | struct dma_async_tx_descriptor *tx) | |
91c00924 | 1841 | { |
91c00924 | 1842 | int disks = sh->disks; |
59fc630b | 1843 | struct page **xor_srcs; |
a08abd8c | 1844 | struct async_submit_ctl submit; |
59fc630b | 1845 | int count, pd_idx = sh->pd_idx, i; |
91c00924 | 1846 | struct page *xor_dest; |
d8ee0728 | 1847 | int prexor = 0; |
91c00924 | 1848 | unsigned long flags; |
59fc630b | 1849 | int j = 0; |
1850 | struct stripe_head *head_sh = sh; | |
1851 | int last_stripe; | |
91c00924 | 1852 | |
e46b272b | 1853 | pr_debug("%s: stripe %llu\n", __func__, |
91c00924 DW |
1854 | (unsigned long long)sh->sector); |
1855 | ||
620125f2 SL |
1856 | for (i = 0; i < sh->disks; i++) { |
1857 | if (pd_idx == i) | |
1858 | continue; | |
1859 | if (!test_bit(R5_Discard, &sh->dev[i].flags)) | |
1860 | break; | |
1861 | } | |
1862 | if (i >= sh->disks) { | |
1863 | atomic_inc(&sh->count); | |
620125f2 SL |
1864 | set_bit(R5_Discard, &sh->dev[pd_idx].flags); |
1865 | ops_complete_reconstruct(sh); | |
1866 | return; | |
1867 | } | |
59fc630b | 1868 | again: |
1869 | count = 0; | |
1870 | xor_srcs = to_addr_page(percpu, j); | |
91c00924 DW |
1871 | /* check if prexor is active which means only process blocks |
1872 | * that are part of a read-modify-write (written) | |
1873 | */ | |
59fc630b | 1874 | if (head_sh->reconstruct_state == reconstruct_state_prexor_drain_run) { |
d8ee0728 | 1875 | prexor = 1; |
91c00924 DW |
1876 | xor_dest = xor_srcs[count++] = sh->dev[pd_idx].page; |
1877 | for (i = disks; i--; ) { | |
1878 | struct r5dev *dev = &sh->dev[i]; | |
1e6d690b SL |
1879 | if (head_sh->dev[i].written || |
1880 | test_bit(R5_InJournal, &head_sh->dev[i].flags)) | |
91c00924 DW |
1881 | xor_srcs[count++] = dev->page; |
1882 | } | |
1883 | } else { | |
1884 | xor_dest = sh->dev[pd_idx].page; | |
1885 | for (i = disks; i--; ) { | |
1886 | struct r5dev *dev = &sh->dev[i]; | |
1887 | if (i != pd_idx) | |
1888 | xor_srcs[count++] = dev->page; | |
1889 | } | |
1890 | } | |
1891 | ||
91c00924 DW |
1892 | /* 1/ if we prexor'd then the dest is reused as a source |
1893 | * 2/ if we did not prexor then we are redoing the parity | |
1894 | * set ASYNC_TX_XOR_DROP_DST and ASYNC_TX_XOR_ZERO_DST | |
1895 | * for the synchronous xor case | |
1896 | */ | |
59fc630b | 1897 | last_stripe = !head_sh->batch_head || |
1898 | list_first_entry(&sh->batch_list, | |
1899 | struct stripe_head, batch_list) == head_sh; | |
1900 | if (last_stripe) { | |
1901 | flags = ASYNC_TX_ACK | | |
1902 | (prexor ? ASYNC_TX_XOR_DROP_DST : ASYNC_TX_XOR_ZERO_DST); | |
1903 | ||
1904 | atomic_inc(&head_sh->count); | |
1905 | init_async_submit(&submit, flags, tx, ops_complete_reconstruct, head_sh, | |
1906 | to_addr_conv(sh, percpu, j)); | |
1907 | } else { | |
1908 | flags = prexor ? ASYNC_TX_XOR_DROP_DST : ASYNC_TX_XOR_ZERO_DST; | |
1909 | init_async_submit(&submit, flags, tx, NULL, NULL, | |
1910 | to_addr_conv(sh, percpu, j)); | |
1911 | } | |
91c00924 | 1912 | |
a08abd8c DW |
1913 | if (unlikely(count == 1)) |
1914 | tx = async_memcpy(xor_dest, xor_srcs[0], 0, 0, STRIPE_SIZE, &submit); | |
1915 | else | |
1916 | tx = async_xor(xor_dest, xor_srcs, 0, count, STRIPE_SIZE, &submit); | |
59fc630b | 1917 | if (!last_stripe) { |
1918 | j++; | |
1919 | sh = list_first_entry(&sh->batch_list, struct stripe_head, | |
1920 | batch_list); | |
1921 | goto again; | |
1922 | } | |
91c00924 DW |
1923 | } |
1924 | ||
ac6b53b6 DW |
1925 | static void |
1926 | ops_run_reconstruct6(struct stripe_head *sh, struct raid5_percpu *percpu, | |
1927 | struct dma_async_tx_descriptor *tx) | |
1928 | { | |
1929 | struct async_submit_ctl submit; | |
59fc630b | 1930 | struct page **blocks; |
1931 | int count, i, j = 0; | |
1932 | struct stripe_head *head_sh = sh; | |
1933 | int last_stripe; | |
584acdd4 MS |
1934 | int synflags; |
1935 | unsigned long txflags; | |
ac6b53b6 DW |
1936 | |
1937 | pr_debug("%s: stripe %llu\n", __func__, (unsigned long long)sh->sector); | |
1938 | ||
620125f2 SL |
1939 | for (i = 0; i < sh->disks; i++) { |
1940 | if (sh->pd_idx == i || sh->qd_idx == i) | |
1941 | continue; | |
1942 | if (!test_bit(R5_Discard, &sh->dev[i].flags)) | |
1943 | break; | |
1944 | } | |
1945 | if (i >= sh->disks) { | |
1946 | atomic_inc(&sh->count); | |
620125f2 SL |
1947 | set_bit(R5_Discard, &sh->dev[sh->pd_idx].flags); |
1948 | set_bit(R5_Discard, &sh->dev[sh->qd_idx].flags); | |
1949 | ops_complete_reconstruct(sh); | |
1950 | return; | |
1951 | } | |
1952 | ||
59fc630b | 1953 | again: |
1954 | blocks = to_addr_page(percpu, j); | |
584acdd4 MS |
1955 | |
1956 | if (sh->reconstruct_state == reconstruct_state_prexor_drain_run) { | |
1957 | synflags = SYNDROME_SRC_WRITTEN; | |
1958 | txflags = ASYNC_TX_ACK | ASYNC_TX_PQ_XOR_DST; | |
1959 | } else { | |
1960 | synflags = SYNDROME_SRC_ALL; | |
1961 | txflags = ASYNC_TX_ACK; | |
1962 | } | |
1963 | ||
1964 | count = set_syndrome_sources(blocks, sh, synflags); | |
59fc630b | 1965 | last_stripe = !head_sh->batch_head || |
1966 | list_first_entry(&sh->batch_list, | |
1967 | struct stripe_head, batch_list) == head_sh; | |
1968 | ||
1969 | if (last_stripe) { | |
1970 | atomic_inc(&head_sh->count); | |
584acdd4 | 1971 | init_async_submit(&submit, txflags, tx, ops_complete_reconstruct, |
59fc630b | 1972 | head_sh, to_addr_conv(sh, percpu, j)); |
1973 | } else | |
1974 | init_async_submit(&submit, 0, tx, NULL, NULL, | |
1975 | to_addr_conv(sh, percpu, j)); | |
48769695 | 1976 | tx = async_gen_syndrome(blocks, 0, count+2, STRIPE_SIZE, &submit); |
59fc630b | 1977 | if (!last_stripe) { |
1978 | j++; | |
1979 | sh = list_first_entry(&sh->batch_list, struct stripe_head, | |
1980 | batch_list); | |
1981 | goto again; | |
1982 | } | |
91c00924 DW |
1983 | } |
1984 | ||
1985 | static void ops_complete_check(void *stripe_head_ref) | |
1986 | { | |
1987 | struct stripe_head *sh = stripe_head_ref; | |
91c00924 | 1988 | |
e46b272b | 1989 | pr_debug("%s: stripe %llu\n", __func__, |
91c00924 DW |
1990 | (unsigned long long)sh->sector); |
1991 | ||
ecc65c9b | 1992 | sh->check_state = check_state_check_result; |
91c00924 | 1993 | set_bit(STRIPE_HANDLE, &sh->state); |
6d036f7d | 1994 | raid5_release_stripe(sh); |
91c00924 DW |
1995 | } |
1996 | ||
ac6b53b6 | 1997 | static void ops_run_check_p(struct stripe_head *sh, struct raid5_percpu *percpu) |
91c00924 | 1998 | { |
91c00924 | 1999 | int disks = sh->disks; |
ac6b53b6 DW |
2000 | int pd_idx = sh->pd_idx; |
2001 | int qd_idx = sh->qd_idx; | |
2002 | struct page *xor_dest; | |
46d5b785 | 2003 | struct page **xor_srcs = to_addr_page(percpu, 0); |
91c00924 | 2004 | struct dma_async_tx_descriptor *tx; |
a08abd8c | 2005 | struct async_submit_ctl submit; |
ac6b53b6 DW |
2006 | int count; |
2007 | int i; | |
91c00924 | 2008 | |
e46b272b | 2009 | pr_debug("%s: stripe %llu\n", __func__, |
91c00924 DW |
2010 | (unsigned long long)sh->sector); |
2011 | ||
59fc630b | 2012 | BUG_ON(sh->batch_head); |
ac6b53b6 DW |
2013 | count = 0; |
2014 | xor_dest = sh->dev[pd_idx].page; | |
2015 | xor_srcs[count++] = xor_dest; | |
91c00924 | 2016 | for (i = disks; i--; ) { |
ac6b53b6 DW |
2017 | if (i == pd_idx || i == qd_idx) |
2018 | continue; | |
2019 | xor_srcs[count++] = sh->dev[i].page; | |
91c00924 DW |
2020 | } |
2021 | ||
d6f38f31 | 2022 | init_async_submit(&submit, 0, NULL, NULL, NULL, |
46d5b785 | 2023 | to_addr_conv(sh, percpu, 0)); |
099f53cb | 2024 | tx = async_xor_val(xor_dest, xor_srcs, 0, count, STRIPE_SIZE, |
a08abd8c | 2025 | &sh->ops.zero_sum_result, &submit); |
91c00924 | 2026 | |
91c00924 | 2027 | atomic_inc(&sh->count); |
a08abd8c DW |
2028 | init_async_submit(&submit, ASYNC_TX_ACK, tx, ops_complete_check, sh, NULL); |
2029 | tx = async_trigger_callback(&submit); | |
91c00924 DW |
2030 | } |
2031 | ||
ac6b53b6 DW |
2032 | static void ops_run_check_pq(struct stripe_head *sh, struct raid5_percpu *percpu, int checkp) |
2033 | { | |
46d5b785 | 2034 | struct page **srcs = to_addr_page(percpu, 0); |
ac6b53b6 DW |
2035 | struct async_submit_ctl submit; |
2036 | int count; | |
2037 | ||
2038 | pr_debug("%s: stripe %llu checkp: %d\n", __func__, | |
2039 | (unsigned long long)sh->sector, checkp); | |
2040 | ||
59fc630b | 2041 | BUG_ON(sh->batch_head); |
584acdd4 | 2042 | count = set_syndrome_sources(srcs, sh, SYNDROME_SRC_ALL); |
ac6b53b6 DW |
2043 | if (!checkp) |
2044 | srcs[count] = NULL; | |
91c00924 | 2045 | |
91c00924 | 2046 | atomic_inc(&sh->count); |
ac6b53b6 | 2047 | init_async_submit(&submit, ASYNC_TX_ACK, NULL, ops_complete_check, |
46d5b785 | 2048 | sh, to_addr_conv(sh, percpu, 0)); |
ac6b53b6 DW |
2049 | async_syndrome_val(srcs, 0, count+2, STRIPE_SIZE, |
2050 | &sh->ops.zero_sum_result, percpu->spare_page, &submit); | |
91c00924 DW |
2051 | } |
2052 | ||
51acbcec | 2053 | static void raid_run_ops(struct stripe_head *sh, unsigned long ops_request) |
91c00924 DW |
2054 | { |
2055 | int overlap_clear = 0, i, disks = sh->disks; | |
2056 | struct dma_async_tx_descriptor *tx = NULL; | |
d1688a6d | 2057 | struct r5conf *conf = sh->raid_conf; |
ac6b53b6 | 2058 | int level = conf->level; |
d6f38f31 DW |
2059 | struct raid5_percpu *percpu; |
2060 | unsigned long cpu; | |
91c00924 | 2061 | |
d6f38f31 DW |
2062 | cpu = get_cpu(); |
2063 | percpu = per_cpu_ptr(conf->percpu, cpu); | |
83de75cc | 2064 | if (test_bit(STRIPE_OP_BIOFILL, &ops_request)) { |
91c00924 DW |
2065 | ops_run_biofill(sh); |
2066 | overlap_clear++; | |
2067 | } | |
2068 | ||
7b3a871e | 2069 | if (test_bit(STRIPE_OP_COMPUTE_BLK, &ops_request)) { |
ac6b53b6 DW |
2070 | if (level < 6) |
2071 | tx = ops_run_compute5(sh, percpu); | |
2072 | else { | |
2073 | if (sh->ops.target2 < 0 || sh->ops.target < 0) | |
2074 | tx = ops_run_compute6_1(sh, percpu); | |
2075 | else | |
2076 | tx = ops_run_compute6_2(sh, percpu); | |
2077 | } | |
2078 | /* terminate the chain if reconstruct is not set to be run */ | |
2079 | if (tx && !test_bit(STRIPE_OP_RECONSTRUCT, &ops_request)) | |
7b3a871e DW |
2080 | async_tx_ack(tx); |
2081 | } | |
91c00924 | 2082 | |
584acdd4 MS |
2083 | if (test_bit(STRIPE_OP_PREXOR, &ops_request)) { |
2084 | if (level < 6) | |
2085 | tx = ops_run_prexor5(sh, percpu, tx); | |
2086 | else | |
2087 | tx = ops_run_prexor6(sh, percpu, tx); | |
2088 | } | |
91c00924 | 2089 | |
ae1713e2 AP |
2090 | if (test_bit(STRIPE_OP_PARTIAL_PARITY, &ops_request)) |
2091 | tx = ops_run_partial_parity(sh, percpu, tx); | |
2092 | ||
600aa109 | 2093 | if (test_bit(STRIPE_OP_BIODRAIN, &ops_request)) { |
d8ee0728 | 2094 | tx = ops_run_biodrain(sh, tx); |
91c00924 DW |
2095 | overlap_clear++; |
2096 | } | |
2097 | ||
ac6b53b6 DW |
2098 | if (test_bit(STRIPE_OP_RECONSTRUCT, &ops_request)) { |
2099 | if (level < 6) | |
2100 | ops_run_reconstruct5(sh, percpu, tx); | |
2101 | else | |
2102 | ops_run_reconstruct6(sh, percpu, tx); | |
2103 | } | |
91c00924 | 2104 | |
ac6b53b6 DW |
2105 | if (test_bit(STRIPE_OP_CHECK, &ops_request)) { |
2106 | if (sh->check_state == check_state_run) | |
2107 | ops_run_check_p(sh, percpu); | |
2108 | else if (sh->check_state == check_state_run_q) | |
2109 | ops_run_check_pq(sh, percpu, 0); | |
2110 | else if (sh->check_state == check_state_run_pq) | |
2111 | ops_run_check_pq(sh, percpu, 1); | |
2112 | else | |
2113 | BUG(); | |
2114 | } | |
91c00924 | 2115 | |
59fc630b | 2116 | if (overlap_clear && !sh->batch_head) |
91c00924 DW |
2117 | for (i = disks; i--; ) { |
2118 | struct r5dev *dev = &sh->dev[i]; | |
2119 | if (test_and_clear_bit(R5_Overlap, &dev->flags)) | |
2120 | wake_up(&sh->raid_conf->wait_for_overlap); | |
2121 | } | |
d6f38f31 | 2122 | put_cpu(); |
91c00924 DW |
2123 | } |
2124 | ||
845b9e22 AP |
2125 | static void free_stripe(struct kmem_cache *sc, struct stripe_head *sh) |
2126 | { | |
2127 | if (sh->ppl_page) | |
2128 | __free_page(sh->ppl_page); | |
2129 | kmem_cache_free(sc, sh); | |
2130 | } | |
2131 | ||
5f9d1fde | 2132 | static struct stripe_head *alloc_stripe(struct kmem_cache *sc, gfp_t gfp, |
845b9e22 | 2133 | int disks, struct r5conf *conf) |
f18c1a35 N |
2134 | { |
2135 | struct stripe_head *sh; | |
5f9d1fde | 2136 | int i; |
f18c1a35 N |
2137 | |
2138 | sh = kmem_cache_zalloc(sc, gfp); | |
2139 | if (sh) { | |
2140 | spin_lock_init(&sh->stripe_lock); | |
2141 | spin_lock_init(&sh->batch_lock); | |
2142 | INIT_LIST_HEAD(&sh->batch_list); | |
2143 | INIT_LIST_HEAD(&sh->lru); | |
a39f7afd | 2144 | INIT_LIST_HEAD(&sh->r5c); |
d7bd398e | 2145 | INIT_LIST_HEAD(&sh->log_list); |
f18c1a35 | 2146 | atomic_set(&sh->count, 1); |
845b9e22 | 2147 | sh->raid_conf = conf; |
a39f7afd | 2148 | sh->log_start = MaxSector; |
5f9d1fde SL |
2149 | for (i = 0; i < disks; i++) { |
2150 | struct r5dev *dev = &sh->dev[i]; | |
2151 | ||
3a83f467 ML |
2152 | bio_init(&dev->req, &dev->vec, 1); |
2153 | bio_init(&dev->rreq, &dev->rvec, 1); | |
5f9d1fde | 2154 | } |
845b9e22 AP |
2155 | |
2156 | if (raid5_has_ppl(conf)) { | |
2157 | sh->ppl_page = alloc_page(gfp); | |
2158 | if (!sh->ppl_page) { | |
2159 | free_stripe(sc, sh); | |
2160 | sh = NULL; | |
2161 | } | |
2162 | } | |
f18c1a35 N |
2163 | } |
2164 | return sh; | |
2165 | } | |
486f0644 | 2166 | static int grow_one_stripe(struct r5conf *conf, gfp_t gfp) |
1da177e4 LT |
2167 | { |
2168 | struct stripe_head *sh; | |
f18c1a35 | 2169 | |
845b9e22 | 2170 | sh = alloc_stripe(conf->slab_cache, gfp, conf->pool_size, conf); |
3f294f4f N |
2171 | if (!sh) |
2172 | return 0; | |
6ce32846 | 2173 | |
a9683a79 | 2174 | if (grow_buffers(sh, gfp)) { |
e4e11e38 | 2175 | shrink_buffers(sh); |
845b9e22 | 2176 | free_stripe(conf->slab_cache, sh); |
3f294f4f N |
2177 | return 0; |
2178 | } | |
486f0644 N |
2179 | sh->hash_lock_index = |
2180 | conf->max_nr_stripes % NR_STRIPE_HASH_LOCKS; | |
3f294f4f | 2181 | /* we just created an active stripe so... */ |
3f294f4f | 2182 | atomic_inc(&conf->active_stripes); |
59fc630b | 2183 | |
6d036f7d | 2184 | raid5_release_stripe(sh); |
486f0644 | 2185 | conf->max_nr_stripes++; |
3f294f4f N |
2186 | return 1; |
2187 | } | |
2188 | ||
d1688a6d | 2189 | static int grow_stripes(struct r5conf *conf, int num) |
3f294f4f | 2190 | { |
e18b890b | 2191 | struct kmem_cache *sc; |
5e5e3e78 | 2192 | int devs = max(conf->raid_disks, conf->previous_raid_disks); |
1da177e4 | 2193 | |
f4be6b43 N |
2194 | if (conf->mddev->gendisk) |
2195 | sprintf(conf->cache_name[0], | |
2196 | "raid%d-%s", conf->level, mdname(conf->mddev)); | |
2197 | else | |
2198 | sprintf(conf->cache_name[0], | |
2199 | "raid%d-%p", conf->level, conf->mddev); | |
2200 | sprintf(conf->cache_name[1], "%s-alt", conf->cache_name[0]); | |
2201 | ||
ad01c9e3 N |
2202 | conf->active_name = 0; |
2203 | sc = kmem_cache_create(conf->cache_name[conf->active_name], | |
1da177e4 | 2204 | sizeof(struct stripe_head)+(devs-1)*sizeof(struct r5dev), |
20c2df83 | 2205 | 0, 0, NULL); |
1da177e4 LT |
2206 | if (!sc) |
2207 | return 1; | |
2208 | conf->slab_cache = sc; | |
ad01c9e3 | 2209 | conf->pool_size = devs; |
486f0644 N |
2210 | while (num--) |
2211 | if (!grow_one_stripe(conf, GFP_KERNEL)) | |
1da177e4 | 2212 | return 1; |
486f0644 | 2213 | |
1da177e4 LT |
2214 | return 0; |
2215 | } | |
29269553 | 2216 | |
d6f38f31 DW |
2217 | /** |
2218 | * scribble_len - return the required size of the scribble region | |
2219 | * @num - total number of disks in the array | |
2220 | * | |
2221 | * The size must be enough to contain: | |
2222 | * 1/ a struct page pointer for each device in the array +2 | |
2223 | * 2/ room to convert each entry in (1) to its corresponding dma | |
2224 | * (dma_map_page()) or page (page_address()) address. | |
2225 | * | |
2226 | * Note: the +2 is for the destination buffers of the ddf/raid6 case where we | |
2227 | * calculate over all devices (not just the data blocks), using zeros in place | |
2228 | * of the P and Q blocks. | |
2229 | */ | |
46d5b785 | 2230 | static struct flex_array *scribble_alloc(int num, int cnt, gfp_t flags) |
d6f38f31 | 2231 | { |
46d5b785 | 2232 | struct flex_array *ret; |
d6f38f31 DW |
2233 | size_t len; |
2234 | ||
2235 | len = sizeof(struct page *) * (num+2) + sizeof(addr_conv_t) * (num+2); | |
46d5b785 | 2236 | ret = flex_array_alloc(len, cnt, flags); |
2237 | if (!ret) | |
2238 | return NULL; | |
2239 | /* always prealloc all elements, so no locking is required */ | |
2240 | if (flex_array_prealloc(ret, 0, cnt, flags)) { | |
2241 | flex_array_free(ret); | |
2242 | return NULL; | |
2243 | } | |
2244 | return ret; | |
d6f38f31 DW |
2245 | } |
2246 | ||
738a2738 N |
2247 | static int resize_chunks(struct r5conf *conf, int new_disks, int new_sectors) |
2248 | { | |
2249 | unsigned long cpu; | |
2250 | int err = 0; | |
2251 | ||
27a353c0 SL |
2252 | /* |
2253 | * Never shrink. And mddev_suspend() could deadlock if this is called | |
2254 | * from raid5d. In that case, scribble_disks and scribble_sectors | |
2255 | * should equal to new_disks and new_sectors | |
2256 | */ | |
2257 | if (conf->scribble_disks >= new_disks && | |
2258 | conf->scribble_sectors >= new_sectors) | |
2259 | return 0; | |
738a2738 N |
2260 | mddev_suspend(conf->mddev); |
2261 | get_online_cpus(); | |
2262 | for_each_present_cpu(cpu) { | |
2263 | struct raid5_percpu *percpu; | |
2264 | struct flex_array *scribble; | |
2265 | ||
2266 | percpu = per_cpu_ptr(conf->percpu, cpu); | |
2267 | scribble = scribble_alloc(new_disks, | |
2268 | new_sectors / STRIPE_SECTORS, | |
2269 | GFP_NOIO); | |
2270 | ||
2271 | if (scribble) { | |
2272 | flex_array_free(percpu->scribble); | |
2273 | percpu->scribble = scribble; | |
2274 | } else { | |
2275 | err = -ENOMEM; | |
2276 | break; | |
2277 | } | |
2278 | } | |
2279 | put_online_cpus(); | |
2280 | mddev_resume(conf->mddev); | |
27a353c0 SL |
2281 | if (!err) { |
2282 | conf->scribble_disks = new_disks; | |
2283 | conf->scribble_sectors = new_sectors; | |
2284 | } | |
738a2738 N |
2285 | return err; |
2286 | } | |
2287 | ||
d1688a6d | 2288 | static int resize_stripes(struct r5conf *conf, int newsize) |
ad01c9e3 N |
2289 | { |
2290 | /* Make all the stripes able to hold 'newsize' devices. | |
2291 | * New slots in each stripe get 'page' set to a new page. | |
2292 | * | |
2293 | * This happens in stages: | |
2294 | * 1/ create a new kmem_cache and allocate the required number of | |
2295 | * stripe_heads. | |
83f0d77a | 2296 | * 2/ gather all the old stripe_heads and transfer the pages across |
ad01c9e3 N |
2297 | * to the new stripe_heads. This will have the side effect of |
2298 | * freezing the array as once all stripe_heads have been collected, | |
2299 | * no IO will be possible. Old stripe heads are freed once their | |
2300 | * pages have been transferred over, and the old kmem_cache is | |
2301 | * freed when all stripes are done. | |
2302 | * 3/ reallocate conf->disks to be suitable bigger. If this fails, | |
3560741e | 2303 | * we simple return a failure status - no need to clean anything up. |
ad01c9e3 N |
2304 | * 4/ allocate new pages for the new slots in the new stripe_heads. |
2305 | * If this fails, we don't bother trying the shrink the | |
2306 | * stripe_heads down again, we just leave them as they are. | |
2307 | * As each stripe_head is processed the new one is released into | |
2308 | * active service. | |
2309 | * | |
2310 | * Once step2 is started, we cannot afford to wait for a write, | |
2311 | * so we use GFP_NOIO allocations. | |
2312 | */ | |
2313 | struct stripe_head *osh, *nsh; | |
2314 | LIST_HEAD(newstripes); | |
2315 | struct disk_info *ndisks; | |
2214c260 | 2316 | int err = 0; |
e18b890b | 2317 | struct kmem_cache *sc; |
ad01c9e3 | 2318 | int i; |
566c09c5 | 2319 | int hash, cnt; |
ad01c9e3 | 2320 | |
2214c260 | 2321 | md_allow_write(conf->mddev); |
2a2275d6 | 2322 | |
ad01c9e3 N |
2323 | /* Step 1 */ |
2324 | sc = kmem_cache_create(conf->cache_name[1-conf->active_name], | |
2325 | sizeof(struct stripe_head)+(newsize-1)*sizeof(struct r5dev), | |
20c2df83 | 2326 | 0, 0, NULL); |
ad01c9e3 N |
2327 | if (!sc) |
2328 | return -ENOMEM; | |
2329 | ||
2d5b569b N |
2330 | /* Need to ensure auto-resizing doesn't interfere */ |
2331 | mutex_lock(&conf->cache_size_mutex); | |
2332 | ||
ad01c9e3 | 2333 | for (i = conf->max_nr_stripes; i; i--) { |
845b9e22 | 2334 | nsh = alloc_stripe(sc, GFP_KERNEL, newsize, conf); |
ad01c9e3 N |
2335 | if (!nsh) |
2336 | break; | |
2337 | ||
ad01c9e3 N |
2338 | list_add(&nsh->lru, &newstripes); |
2339 | } | |
2340 | if (i) { | |
2341 | /* didn't get enough, give up */ | |
2342 | while (!list_empty(&newstripes)) { | |
2343 | nsh = list_entry(newstripes.next, struct stripe_head, lru); | |
2344 | list_del(&nsh->lru); | |
845b9e22 | 2345 | free_stripe(sc, nsh); |
ad01c9e3 N |
2346 | } |
2347 | kmem_cache_destroy(sc); | |
2d5b569b | 2348 | mutex_unlock(&conf->cache_size_mutex); |
ad01c9e3 N |
2349 | return -ENOMEM; |
2350 | } | |
2351 | /* Step 2 - Must use GFP_NOIO now. | |
2352 | * OK, we have enough stripes, start collecting inactive | |
2353 | * stripes and copying them over | |
2354 | */ | |
566c09c5 SL |
2355 | hash = 0; |
2356 | cnt = 0; | |
ad01c9e3 | 2357 | list_for_each_entry(nsh, &newstripes, lru) { |
566c09c5 | 2358 | lock_device_hash_lock(conf, hash); |
6ab2a4b8 | 2359 | wait_event_cmd(conf->wait_for_stripe, |
566c09c5 SL |
2360 | !list_empty(conf->inactive_list + hash), |
2361 | unlock_device_hash_lock(conf, hash), | |
2362 | lock_device_hash_lock(conf, hash)); | |
2363 | osh = get_free_stripe(conf, hash); | |
2364 | unlock_device_hash_lock(conf, hash); | |
f18c1a35 | 2365 | |
d592a996 | 2366 | for(i=0; i<conf->pool_size; i++) { |
ad01c9e3 | 2367 | nsh->dev[i].page = osh->dev[i].page; |
d592a996 SL |
2368 | nsh->dev[i].orig_page = osh->dev[i].page; |
2369 | } | |
566c09c5 | 2370 | nsh->hash_lock_index = hash; |
845b9e22 | 2371 | free_stripe(conf->slab_cache, osh); |
566c09c5 SL |
2372 | cnt++; |
2373 | if (cnt >= conf->max_nr_stripes / NR_STRIPE_HASH_LOCKS + | |
2374 | !!((conf->max_nr_stripes % NR_STRIPE_HASH_LOCKS) > hash)) { | |
2375 | hash++; | |
2376 | cnt = 0; | |
2377 | } | |
ad01c9e3 N |
2378 | } |
2379 | kmem_cache_destroy(conf->slab_cache); | |
2380 | ||
2381 | /* Step 3. | |
2382 | * At this point, we are holding all the stripes so the array | |
2383 | * is completely stalled, so now is a good time to resize | |
d6f38f31 | 2384 | * conf->disks and the scribble region |
ad01c9e3 N |
2385 | */ |
2386 | ndisks = kzalloc(newsize * sizeof(struct disk_info), GFP_NOIO); | |
2387 | if (ndisks) { | |
d7bd398e | 2388 | for (i = 0; i < conf->pool_size; i++) |
ad01c9e3 | 2389 | ndisks[i] = conf->disks[i]; |
d7bd398e SL |
2390 | |
2391 | for (i = conf->pool_size; i < newsize; i++) { | |
2392 | ndisks[i].extra_page = alloc_page(GFP_NOIO); | |
2393 | if (!ndisks[i].extra_page) | |
2394 | err = -ENOMEM; | |
2395 | } | |
2396 | ||
2397 | if (err) { | |
2398 | for (i = conf->pool_size; i < newsize; i++) | |
2399 | if (ndisks[i].extra_page) | |
2400 | put_page(ndisks[i].extra_page); | |
2401 | kfree(ndisks); | |
2402 | } else { | |
2403 | kfree(conf->disks); | |
2404 | conf->disks = ndisks; | |
2405 | } | |
ad01c9e3 N |
2406 | } else |
2407 | err = -ENOMEM; | |
2408 | ||
2d5b569b | 2409 | mutex_unlock(&conf->cache_size_mutex); |
583da48e DY |
2410 | |
2411 | conf->slab_cache = sc; | |
2412 | conf->active_name = 1-conf->active_name; | |
2413 | ||
ad01c9e3 N |
2414 | /* Step 4, return new stripes to service */ |
2415 | while(!list_empty(&newstripes)) { | |
2416 | nsh = list_entry(newstripes.next, struct stripe_head, lru); | |
2417 | list_del_init(&nsh->lru); | |
d6f38f31 | 2418 | |
ad01c9e3 N |
2419 | for (i=conf->raid_disks; i < newsize; i++) |
2420 | if (nsh->dev[i].page == NULL) { | |
2421 | struct page *p = alloc_page(GFP_NOIO); | |
2422 | nsh->dev[i].page = p; | |
d592a996 | 2423 | nsh->dev[i].orig_page = p; |
ad01c9e3 N |
2424 | if (!p) |
2425 | err = -ENOMEM; | |
2426 | } | |
6d036f7d | 2427 | raid5_release_stripe(nsh); |
ad01c9e3 N |
2428 | } |
2429 | /* critical section pass, GFP_NOIO no longer needed */ | |
2430 | ||
6e9eac2d N |
2431 | if (!err) |
2432 | conf->pool_size = newsize; | |
ad01c9e3 N |
2433 | return err; |
2434 | } | |
1da177e4 | 2435 | |
486f0644 | 2436 | static int drop_one_stripe(struct r5conf *conf) |
1da177e4 LT |
2437 | { |
2438 | struct stripe_head *sh; | |
49895bcc | 2439 | int hash = (conf->max_nr_stripes - 1) & STRIPE_HASH_LOCKS_MASK; |
1da177e4 | 2440 | |
566c09c5 SL |
2441 | spin_lock_irq(conf->hash_locks + hash); |
2442 | sh = get_free_stripe(conf, hash); | |
2443 | spin_unlock_irq(conf->hash_locks + hash); | |
3f294f4f N |
2444 | if (!sh) |
2445 | return 0; | |
78bafebd | 2446 | BUG_ON(atomic_read(&sh->count)); |
e4e11e38 | 2447 | shrink_buffers(sh); |
845b9e22 | 2448 | free_stripe(conf->slab_cache, sh); |
3f294f4f | 2449 | atomic_dec(&conf->active_stripes); |
486f0644 | 2450 | conf->max_nr_stripes--; |
3f294f4f N |
2451 | return 1; |
2452 | } | |
2453 | ||
d1688a6d | 2454 | static void shrink_stripes(struct r5conf *conf) |
3f294f4f | 2455 | { |
486f0644 N |
2456 | while (conf->max_nr_stripes && |
2457 | drop_one_stripe(conf)) | |
2458 | ; | |
3f294f4f | 2459 | |
644df1a8 | 2460 | kmem_cache_destroy(conf->slab_cache); |
1da177e4 LT |
2461 | conf->slab_cache = NULL; |
2462 | } | |
2463 | ||
4246a0b6 | 2464 | static void raid5_end_read_request(struct bio * bi) |
1da177e4 | 2465 | { |
99c0fb5f | 2466 | struct stripe_head *sh = bi->bi_private; |
d1688a6d | 2467 | struct r5conf *conf = sh->raid_conf; |
7ecaa1e6 | 2468 | int disks = sh->disks, i; |
d6950432 | 2469 | char b[BDEVNAME_SIZE]; |
dd054fce | 2470 | struct md_rdev *rdev = NULL; |
05616be5 | 2471 | sector_t s; |
1da177e4 LT |
2472 | |
2473 | for (i=0 ; i<disks; i++) | |
2474 | if (bi == &sh->dev[i].req) | |
2475 | break; | |
2476 | ||
4246a0b6 | 2477 | pr_debug("end_read_request %llu/%d, count: %d, error %d.\n", |
45b4233c | 2478 | (unsigned long long)sh->sector, i, atomic_read(&sh->count), |
4246a0b6 | 2479 | bi->bi_error); |
1da177e4 | 2480 | if (i == disks) { |
5f9d1fde | 2481 | bio_reset(bi); |
1da177e4 | 2482 | BUG(); |
6712ecf8 | 2483 | return; |
1da177e4 | 2484 | } |
14a75d3e | 2485 | if (test_bit(R5_ReadRepl, &sh->dev[i].flags)) |
dd054fce N |
2486 | /* If replacement finished while this request was outstanding, |
2487 | * 'replacement' might be NULL already. | |
2488 | * In that case it moved down to 'rdev'. | |
2489 | * rdev is not removed until all requests are finished. | |
2490 | */ | |
14a75d3e | 2491 | rdev = conf->disks[i].replacement; |
dd054fce | 2492 | if (!rdev) |
14a75d3e | 2493 | rdev = conf->disks[i].rdev; |
1da177e4 | 2494 | |
05616be5 N |
2495 | if (use_new_offset(conf, sh)) |
2496 | s = sh->sector + rdev->new_data_offset; | |
2497 | else | |
2498 | s = sh->sector + rdev->data_offset; | |
4246a0b6 | 2499 | if (!bi->bi_error) { |
1da177e4 | 2500 | set_bit(R5_UPTODATE, &sh->dev[i].flags); |
4e5314b5 | 2501 | if (test_bit(R5_ReadError, &sh->dev[i].flags)) { |
14a75d3e N |
2502 | /* Note that this cannot happen on a |
2503 | * replacement device. We just fail those on | |
2504 | * any error | |
2505 | */ | |
cc6167b4 N |
2506 | pr_info_ratelimited( |
2507 | "md/raid:%s: read error corrected (%lu sectors at %llu on %s)\n", | |
8bda470e | 2508 | mdname(conf->mddev), STRIPE_SECTORS, |
05616be5 | 2509 | (unsigned long long)s, |
8bda470e | 2510 | bdevname(rdev->bdev, b)); |
ddd5115f | 2511 | atomic_add(STRIPE_SECTORS, &rdev->corrected_errors); |
4e5314b5 N |
2512 | clear_bit(R5_ReadError, &sh->dev[i].flags); |
2513 | clear_bit(R5_ReWrite, &sh->dev[i].flags); | |
3f9e7c14 | 2514 | } else if (test_bit(R5_ReadNoMerge, &sh->dev[i].flags)) |
2515 | clear_bit(R5_ReadNoMerge, &sh->dev[i].flags); | |
2516 | ||
86aa1397 SL |
2517 | if (test_bit(R5_InJournal, &sh->dev[i].flags)) |
2518 | /* | |
2519 | * end read for a page in journal, this | |
2520 | * must be preparing for prexor in rmw | |
2521 | */ | |
2522 | set_bit(R5_OrigPageUPTDODATE, &sh->dev[i].flags); | |
2523 | ||
14a75d3e N |
2524 | if (atomic_read(&rdev->read_errors)) |
2525 | atomic_set(&rdev->read_errors, 0); | |
1da177e4 | 2526 | } else { |
14a75d3e | 2527 | const char *bdn = bdevname(rdev->bdev, b); |
ba22dcbf | 2528 | int retry = 0; |
2e8ac303 | 2529 | int set_bad = 0; |
d6950432 | 2530 | |
1da177e4 | 2531 | clear_bit(R5_UPTODATE, &sh->dev[i].flags); |
d6950432 | 2532 | atomic_inc(&rdev->read_errors); |
14a75d3e | 2533 | if (test_bit(R5_ReadRepl, &sh->dev[i].flags)) |
cc6167b4 N |
2534 | pr_warn_ratelimited( |
2535 | "md/raid:%s: read error on replacement device (sector %llu on %s).\n", | |
14a75d3e | 2536 | mdname(conf->mddev), |
05616be5 | 2537 | (unsigned long long)s, |
14a75d3e | 2538 | bdn); |
2e8ac303 | 2539 | else if (conf->mddev->degraded >= conf->max_degraded) { |
2540 | set_bad = 1; | |
cc6167b4 N |
2541 | pr_warn_ratelimited( |
2542 | "md/raid:%s: read error not correctable (sector %llu on %s).\n", | |
8bda470e | 2543 | mdname(conf->mddev), |
05616be5 | 2544 | (unsigned long long)s, |
8bda470e | 2545 | bdn); |
2e8ac303 | 2546 | } else if (test_bit(R5_ReWrite, &sh->dev[i].flags)) { |
4e5314b5 | 2547 | /* Oh, no!!! */ |
2e8ac303 | 2548 | set_bad = 1; |
cc6167b4 N |
2549 | pr_warn_ratelimited( |
2550 | "md/raid:%s: read error NOT corrected!! (sector %llu on %s).\n", | |
8bda470e | 2551 | mdname(conf->mddev), |
05616be5 | 2552 | (unsigned long long)s, |
8bda470e | 2553 | bdn); |
2e8ac303 | 2554 | } else if (atomic_read(&rdev->read_errors) |
ba22dcbf | 2555 | > conf->max_nr_stripes) |
cc6167b4 | 2556 | pr_warn("md/raid:%s: Too many read errors, failing device %s.\n", |
d6950432 | 2557 | mdname(conf->mddev), bdn); |
ba22dcbf N |
2558 | else |
2559 | retry = 1; | |
edfa1f65 BY |
2560 | if (set_bad && test_bit(In_sync, &rdev->flags) |
2561 | && !test_bit(R5_ReadNoMerge, &sh->dev[i].flags)) | |
2562 | retry = 1; | |
ba22dcbf | 2563 | if (retry) |
3f9e7c14 | 2564 | if (test_bit(R5_ReadNoMerge, &sh->dev[i].flags)) { |
2565 | set_bit(R5_ReadError, &sh->dev[i].flags); | |
2566 | clear_bit(R5_ReadNoMerge, &sh->dev[i].flags); | |
2567 | } else | |
2568 | set_bit(R5_ReadNoMerge, &sh->dev[i].flags); | |
ba22dcbf | 2569 | else { |
4e5314b5 N |
2570 | clear_bit(R5_ReadError, &sh->dev[i].flags); |
2571 | clear_bit(R5_ReWrite, &sh->dev[i].flags); | |
2e8ac303 | 2572 | if (!(set_bad |
2573 | && test_bit(In_sync, &rdev->flags) | |
2574 | && rdev_set_badblocks( | |
2575 | rdev, sh->sector, STRIPE_SECTORS, 0))) | |
2576 | md_error(conf->mddev, rdev); | |
ba22dcbf | 2577 | } |
1da177e4 | 2578 | } |
14a75d3e | 2579 | rdev_dec_pending(rdev, conf->mddev); |
c9445555 | 2580 | bio_reset(bi); |
1da177e4 LT |
2581 | clear_bit(R5_LOCKED, &sh->dev[i].flags); |
2582 | set_bit(STRIPE_HANDLE, &sh->state); | |
6d036f7d | 2583 | raid5_release_stripe(sh); |
1da177e4 LT |
2584 | } |
2585 | ||
4246a0b6 | 2586 | static void raid5_end_write_request(struct bio *bi) |
1da177e4 | 2587 | { |
99c0fb5f | 2588 | struct stripe_head *sh = bi->bi_private; |
d1688a6d | 2589 | struct r5conf *conf = sh->raid_conf; |
7ecaa1e6 | 2590 | int disks = sh->disks, i; |
977df362 | 2591 | struct md_rdev *uninitialized_var(rdev); |
b84db560 N |
2592 | sector_t first_bad; |
2593 | int bad_sectors; | |
977df362 | 2594 | int replacement = 0; |
1da177e4 | 2595 | |
977df362 N |
2596 | for (i = 0 ; i < disks; i++) { |
2597 | if (bi == &sh->dev[i].req) { | |
2598 | rdev = conf->disks[i].rdev; | |
1da177e4 | 2599 | break; |
977df362 N |
2600 | } |
2601 | if (bi == &sh->dev[i].rreq) { | |
2602 | rdev = conf->disks[i].replacement; | |
dd054fce N |
2603 | if (rdev) |
2604 | replacement = 1; | |
2605 | else | |
2606 | /* rdev was removed and 'replacement' | |
2607 | * replaced it. rdev is not removed | |
2608 | * until all requests are finished. | |
2609 | */ | |
2610 | rdev = conf->disks[i].rdev; | |
977df362 N |
2611 | break; |
2612 | } | |
2613 | } | |
4246a0b6 | 2614 | pr_debug("end_write_request %llu/%d, count %d, error: %d.\n", |
1da177e4 | 2615 | (unsigned long long)sh->sector, i, atomic_read(&sh->count), |
4246a0b6 | 2616 | bi->bi_error); |
1da177e4 | 2617 | if (i == disks) { |
5f9d1fde | 2618 | bio_reset(bi); |
1da177e4 | 2619 | BUG(); |
6712ecf8 | 2620 | return; |
1da177e4 LT |
2621 | } |
2622 | ||
977df362 | 2623 | if (replacement) { |
4246a0b6 | 2624 | if (bi->bi_error) |
977df362 N |
2625 | md_error(conf->mddev, rdev); |
2626 | else if (is_badblock(rdev, sh->sector, | |
2627 | STRIPE_SECTORS, | |
2628 | &first_bad, &bad_sectors)) | |
2629 | set_bit(R5_MadeGoodRepl, &sh->dev[i].flags); | |
2630 | } else { | |
4246a0b6 | 2631 | if (bi->bi_error) { |
9f97e4b1 | 2632 | set_bit(STRIPE_DEGRADED, &sh->state); |
977df362 N |
2633 | set_bit(WriteErrorSeen, &rdev->flags); |
2634 | set_bit(R5_WriteError, &sh->dev[i].flags); | |
3a6de292 N |
2635 | if (!test_and_set_bit(WantReplacement, &rdev->flags)) |
2636 | set_bit(MD_RECOVERY_NEEDED, | |
2637 | &rdev->mddev->recovery); | |
977df362 N |
2638 | } else if (is_badblock(rdev, sh->sector, |
2639 | STRIPE_SECTORS, | |
c0b32972 | 2640 | &first_bad, &bad_sectors)) { |
977df362 | 2641 | set_bit(R5_MadeGood, &sh->dev[i].flags); |
c0b32972 N |
2642 | if (test_bit(R5_ReadError, &sh->dev[i].flags)) |
2643 | /* That was a successful write so make | |
2644 | * sure it looks like we already did | |
2645 | * a re-write. | |
2646 | */ | |
2647 | set_bit(R5_ReWrite, &sh->dev[i].flags); | |
2648 | } | |
977df362 N |
2649 | } |
2650 | rdev_dec_pending(rdev, conf->mddev); | |
1da177e4 | 2651 | |
4246a0b6 | 2652 | if (sh->batch_head && bi->bi_error && !replacement) |
72ac7330 | 2653 | set_bit(STRIPE_BATCH_ERR, &sh->batch_head->state); |
2654 | ||
c9445555 | 2655 | bio_reset(bi); |
977df362 N |
2656 | if (!test_and_clear_bit(R5_DOUBLE_LOCKED, &sh->dev[i].flags)) |
2657 | clear_bit(R5_LOCKED, &sh->dev[i].flags); | |
1da177e4 | 2658 | set_bit(STRIPE_HANDLE, &sh->state); |
6d036f7d | 2659 | raid5_release_stripe(sh); |
59fc630b | 2660 | |
2661 | if (sh->batch_head && sh != sh->batch_head) | |
6d036f7d | 2662 | raid5_release_stripe(sh->batch_head); |
1da177e4 LT |
2663 | } |
2664 | ||
784052ec | 2665 | static void raid5_build_block(struct stripe_head *sh, int i, int previous) |
1da177e4 LT |
2666 | { |
2667 | struct r5dev *dev = &sh->dev[i]; | |
2668 | ||
1da177e4 | 2669 | dev->flags = 0; |
6d036f7d | 2670 | dev->sector = raid5_compute_blocknr(sh, i, previous); |
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 N |
2680 | spin_lock_irqsave(&conf->device_lock, flags); |
2681 | clear_bit(In_sync, &rdev->flags); | |
2e38a37f | 2682 | mddev->degraded = raid5_calc_degraded(conf); |
908f4fbd N |
2683 | spin_unlock_irqrestore(&conf->device_lock, flags); |
2684 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); | |
2685 | ||
de393cde | 2686 | set_bit(Blocked, &rdev->flags); |
6f8d0c77 | 2687 | set_bit(Faulty, &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 CH |
3383 | |
3384 | bi->bi_error = -EIO; | |
49728050 | 3385 | md_write_end(conf->mddev); |
016c76ac | 3386 | bio_endio(bi); |
a4456856 DW |
3387 | bi = nextbi; |
3388 | } | |
7eaf7e8e SL |
3389 | if (bitmap_end) |
3390 | bitmap_endwrite(conf->mddev->bitmap, sh->sector, | |
3391 | STRIPE_SECTORS, 0, 0); | |
3392 | bitmap_end = 0; | |
a4456856 DW |
3393 | /* and fail all 'written' */ |
3394 | bi = sh->dev[i].written; | |
3395 | sh->dev[i].written = NULL; | |
d592a996 SL |
3396 | if (test_and_clear_bit(R5_SkipCopy, &sh->dev[i].flags)) { |
3397 | WARN_ON(test_bit(R5_UPTODATE, &sh->dev[i].flags)); | |
3398 | sh->dev[i].page = sh->dev[i].orig_page; | |
3399 | } | |
3400 | ||
a4456856 | 3401 | if (bi) bitmap_end = 1; |
4f024f37 | 3402 | while (bi && bi->bi_iter.bi_sector < |
a4456856 DW |
3403 | sh->dev[i].sector + STRIPE_SECTORS) { |
3404 | struct bio *bi2 = r5_next_bio(bi, sh->dev[i].sector); | |
4246a0b6 CH |
3405 | |
3406 | bi->bi_error = -EIO; | |
49728050 | 3407 | md_write_end(conf->mddev); |
016c76ac | 3408 | bio_endio(bi); |
a4456856 DW |
3409 | bi = bi2; |
3410 | } | |
3411 | ||
b5e98d65 DW |
3412 | /* fail any reads if this device is non-operational and |
3413 | * the data has not reached the cache yet. | |
3414 | */ | |
3415 | if (!test_bit(R5_Wantfill, &sh->dev[i].flags) && | |
6e74a9cf | 3416 | s->failed > conf->max_degraded && |
b5e98d65 DW |
3417 | (!test_bit(R5_Insync, &sh->dev[i].flags) || |
3418 | test_bit(R5_ReadError, &sh->dev[i].flags))) { | |
143c4d05 | 3419 | spin_lock_irq(&sh->stripe_lock); |
a4456856 DW |
3420 | bi = sh->dev[i].toread; |
3421 | sh->dev[i].toread = NULL; | |
143c4d05 | 3422 | spin_unlock_irq(&sh->stripe_lock); |
a4456856 DW |
3423 | if (test_and_clear_bit(R5_Overlap, &sh->dev[i].flags)) |
3424 | wake_up(&conf->wait_for_overlap); | |
ebda780b SL |
3425 | if (bi) |
3426 | s->to_read--; | |
4f024f37 | 3427 | while (bi && bi->bi_iter.bi_sector < |
a4456856 DW |
3428 | sh->dev[i].sector + STRIPE_SECTORS) { |
3429 | struct bio *nextbi = | |
3430 | r5_next_bio(bi, sh->dev[i].sector); | |
4246a0b6 CH |
3431 | |
3432 | bi->bi_error = -EIO; | |
016c76ac | 3433 | bio_endio(bi); |
a4456856 DW |
3434 | bi = nextbi; |
3435 | } | |
3436 | } | |
a4456856 DW |
3437 | if (bitmap_end) |
3438 | bitmap_endwrite(conf->mddev->bitmap, sh->sector, | |
3439 | STRIPE_SECTORS, 0, 0); | |
8cfa7b0f N |
3440 | /* If we were in the middle of a write the parity block might |
3441 | * still be locked - so just clear all R5_LOCKED flags | |
3442 | */ | |
3443 | clear_bit(R5_LOCKED, &sh->dev[i].flags); | |
a4456856 | 3444 | } |
ebda780b SL |
3445 | s->to_write = 0; |
3446 | s->written = 0; | |
a4456856 | 3447 | |
8b3e6cdc DW |
3448 | if (test_and_clear_bit(STRIPE_FULL_WRITE, &sh->state)) |
3449 | if (atomic_dec_and_test(&conf->pending_full_writes)) | |
3450 | md_wakeup_thread(conf->mddev->thread); | |
a4456856 DW |
3451 | } |
3452 | ||
7f0da59b | 3453 | static void |
d1688a6d | 3454 | handle_failed_sync(struct r5conf *conf, struct stripe_head *sh, |
7f0da59b N |
3455 | struct stripe_head_state *s) |
3456 | { | |
3457 | int abort = 0; | |
3458 | int i; | |
3459 | ||
59fc630b | 3460 | BUG_ON(sh->batch_head); |
7f0da59b | 3461 | clear_bit(STRIPE_SYNCING, &sh->state); |
f8dfcffd N |
3462 | if (test_and_clear_bit(R5_Overlap, &sh->dev[sh->pd_idx].flags)) |
3463 | wake_up(&conf->wait_for_overlap); | |
7f0da59b | 3464 | s->syncing = 0; |
9a3e1101 | 3465 | s->replacing = 0; |
7f0da59b | 3466 | /* There is nothing more to do for sync/check/repair. |
18b9837e N |
3467 | * Don't even need to abort as that is handled elsewhere |
3468 | * if needed, and not always wanted e.g. if there is a known | |
3469 | * bad block here. | |
9a3e1101 | 3470 | * For recover/replace we need to record a bad block on all |
7f0da59b N |
3471 | * non-sync devices, or abort the recovery |
3472 | */ | |
18b9837e N |
3473 | if (test_bit(MD_RECOVERY_RECOVER, &conf->mddev->recovery)) { |
3474 | /* During recovery devices cannot be removed, so | |
3475 | * locking and refcounting of rdevs is not needed | |
3476 | */ | |
e50d3992 | 3477 | rcu_read_lock(); |
18b9837e | 3478 | for (i = 0; i < conf->raid_disks; i++) { |
e50d3992 | 3479 | struct md_rdev *rdev = rcu_dereference(conf->disks[i].rdev); |
18b9837e N |
3480 | if (rdev |
3481 | && !test_bit(Faulty, &rdev->flags) | |
3482 | && !test_bit(In_sync, &rdev->flags) | |
3483 | && !rdev_set_badblocks(rdev, sh->sector, | |
3484 | STRIPE_SECTORS, 0)) | |
3485 | abort = 1; | |
e50d3992 | 3486 | rdev = rcu_dereference(conf->disks[i].replacement); |
18b9837e N |
3487 | if (rdev |
3488 | && !test_bit(Faulty, &rdev->flags) | |
3489 | && !test_bit(In_sync, &rdev->flags) | |
3490 | && !rdev_set_badblocks(rdev, sh->sector, | |
3491 | STRIPE_SECTORS, 0)) | |
3492 | abort = 1; | |
3493 | } | |
e50d3992 | 3494 | rcu_read_unlock(); |
18b9837e N |
3495 | if (abort) |
3496 | conf->recovery_disabled = | |
3497 | conf->mddev->recovery_disabled; | |
7f0da59b | 3498 | } |
18b9837e | 3499 | md_done_sync(conf->mddev, STRIPE_SECTORS, !abort); |
7f0da59b N |
3500 | } |
3501 | ||
9a3e1101 N |
3502 | static int want_replace(struct stripe_head *sh, int disk_idx) |
3503 | { | |
3504 | struct md_rdev *rdev; | |
3505 | int rv = 0; | |
3f232d6a N |
3506 | |
3507 | rcu_read_lock(); | |
3508 | rdev = rcu_dereference(sh->raid_conf->disks[disk_idx].replacement); | |
9a3e1101 N |
3509 | if (rdev |
3510 | && !test_bit(Faulty, &rdev->flags) | |
3511 | && !test_bit(In_sync, &rdev->flags) | |
3512 | && (rdev->recovery_offset <= sh->sector | |
3513 | || rdev->mddev->recovery_cp <= sh->sector)) | |
3514 | rv = 1; | |
3f232d6a | 3515 | rcu_read_unlock(); |
9a3e1101 N |
3516 | return rv; |
3517 | } | |
3518 | ||
2c58f06e N |
3519 | static int need_this_block(struct stripe_head *sh, struct stripe_head_state *s, |
3520 | int disk_idx, int disks) | |
a4456856 | 3521 | { |
5599becc | 3522 | struct r5dev *dev = &sh->dev[disk_idx]; |
f2b3b44d N |
3523 | struct r5dev *fdev[2] = { &sh->dev[s->failed_num[0]], |
3524 | &sh->dev[s->failed_num[1]] }; | |
ea664c82 | 3525 | int i; |
5599becc | 3526 | |
a79cfe12 N |
3527 | |
3528 | if (test_bit(R5_LOCKED, &dev->flags) || | |
3529 | test_bit(R5_UPTODATE, &dev->flags)) | |
3530 | /* No point reading this as we already have it or have | |
3531 | * decided to get it. | |
3532 | */ | |
3533 | return 0; | |
3534 | ||
3535 | if (dev->toread || | |
3536 | (dev->towrite && !test_bit(R5_OVERWRITE, &dev->flags))) | |
3537 | /* We need this block to directly satisfy a request */ | |
3538 | return 1; | |
3539 | ||
3540 | if (s->syncing || s->expanding || | |
3541 | (s->replacing && want_replace(sh, disk_idx))) | |
3542 | /* When syncing, or expanding we read everything. | |
3543 | * When replacing, we need the replaced block. | |
3544 | */ | |
3545 | return 1; | |
3546 | ||
3547 | if ((s->failed >= 1 && fdev[0]->toread) || | |
3548 | (s->failed >= 2 && fdev[1]->toread)) | |
3549 | /* If we want to read from a failed device, then | |
3550 | * we need to actually read every other device. | |
3551 | */ | |
3552 | return 1; | |
3553 | ||
a9d56950 N |
3554 | /* Sometimes neither read-modify-write nor reconstruct-write |
3555 | * cycles can work. In those cases we read every block we | |
3556 | * can. Then the parity-update is certain to have enough to | |
3557 | * work with. | |
3558 | * This can only be a problem when we need to write something, | |
3559 | * and some device has failed. If either of those tests | |
3560 | * fail we need look no further. | |
3561 | */ | |
3562 | if (!s->failed || !s->to_write) | |
3563 | return 0; | |
3564 | ||
3565 | if (test_bit(R5_Insync, &dev->flags) && | |
3566 | !test_bit(STRIPE_PREREAD_ACTIVE, &sh->state)) | |
3567 | /* Pre-reads at not permitted until after short delay | |
3568 | * to gather multiple requests. However if this | |
3560741e | 3569 | * device is no Insync, the block could only be computed |
a9d56950 N |
3570 | * and there is no need to delay that. |
3571 | */ | |
3572 | return 0; | |
ea664c82 | 3573 | |
36707bb2 | 3574 | for (i = 0; i < s->failed && i < 2; i++) { |
ea664c82 N |
3575 | if (fdev[i]->towrite && |
3576 | !test_bit(R5_UPTODATE, &fdev[i]->flags) && | |
3577 | !test_bit(R5_OVERWRITE, &fdev[i]->flags)) | |
3578 | /* If we have a partial write to a failed | |
3579 | * device, then we will need to reconstruct | |
3580 | * the content of that device, so all other | |
3581 | * devices must be read. | |
3582 | */ | |
3583 | return 1; | |
3584 | } | |
3585 | ||
3586 | /* If we are forced to do a reconstruct-write, either because | |
3587 | * the current RAID6 implementation only supports that, or | |
3560741e | 3588 | * because parity cannot be trusted and we are currently |
ea664c82 N |
3589 | * recovering it, there is extra need to be careful. |
3590 | * If one of the devices that we would need to read, because | |
3591 | * it is not being overwritten (and maybe not written at all) | |
3592 | * is missing/faulty, then we need to read everything we can. | |
3593 | */ | |
3594 | if (sh->raid_conf->level != 6 && | |
3595 | sh->sector < sh->raid_conf->mddev->recovery_cp) | |
3596 | /* reconstruct-write isn't being forced */ | |
3597 | return 0; | |
36707bb2 | 3598 | for (i = 0; i < s->failed && i < 2; i++) { |
10d82c5f N |
3599 | if (s->failed_num[i] != sh->pd_idx && |
3600 | s->failed_num[i] != sh->qd_idx && | |
3601 | !test_bit(R5_UPTODATE, &fdev[i]->flags) && | |
ea664c82 N |
3602 | !test_bit(R5_OVERWRITE, &fdev[i]->flags)) |
3603 | return 1; | |
3604 | } | |
3605 | ||
2c58f06e N |
3606 | return 0; |
3607 | } | |
3608 | ||
ba02684d SL |
3609 | /* fetch_block - checks the given member device to see if its data needs |
3610 | * to be read or computed to satisfy a request. | |
3611 | * | |
3612 | * Returns 1 when no more member devices need to be checked, otherwise returns | |
3613 | * 0 to tell the loop in handle_stripe_fill to continue | |
3614 | */ | |
2c58f06e N |
3615 | static int fetch_block(struct stripe_head *sh, struct stripe_head_state *s, |
3616 | int disk_idx, int disks) | |
3617 | { | |
3618 | struct r5dev *dev = &sh->dev[disk_idx]; | |
3619 | ||
3620 | /* is the data in this block needed, and can we get it? */ | |
3621 | if (need_this_block(sh, s, disk_idx, disks)) { | |
5599becc YT |
3622 | /* we would like to get this block, possibly by computing it, |
3623 | * otherwise read it if the backing disk is insync | |
3624 | */ | |
3625 | BUG_ON(test_bit(R5_Wantcompute, &dev->flags)); | |
3626 | BUG_ON(test_bit(R5_Wantread, &dev->flags)); | |
b0c783b3 | 3627 | BUG_ON(sh->batch_head); |
7471fb77 N |
3628 | |
3629 | /* | |
3630 | * In the raid6 case if the only non-uptodate disk is P | |
3631 | * then we already trusted P to compute the other failed | |
3632 | * drives. It is safe to compute rather than re-read P. | |
3633 | * In other cases we only compute blocks from failed | |
3634 | * devices, otherwise check/repair might fail to detect | |
3635 | * a real inconsistency. | |
3636 | */ | |
3637 | ||
5599becc | 3638 | if ((s->uptodate == disks - 1) && |
7471fb77 | 3639 | ((sh->qd_idx >= 0 && sh->pd_idx == disk_idx) || |
f2b3b44d | 3640 | (s->failed && (disk_idx == s->failed_num[0] || |
7471fb77 | 3641 | disk_idx == s->failed_num[1])))) { |
5599becc YT |
3642 | /* have disk failed, and we're requested to fetch it; |
3643 | * do compute it | |
a4456856 | 3644 | */ |
5599becc YT |
3645 | pr_debug("Computing stripe %llu block %d\n", |
3646 | (unsigned long long)sh->sector, disk_idx); | |
3647 | set_bit(STRIPE_COMPUTE_RUN, &sh->state); | |
3648 | set_bit(STRIPE_OP_COMPUTE_BLK, &s->ops_request); | |
3649 | set_bit(R5_Wantcompute, &dev->flags); | |
3650 | sh->ops.target = disk_idx; | |
3651 | sh->ops.target2 = -1; /* no 2nd target */ | |
3652 | s->req_compute = 1; | |
93b3dbce N |
3653 | /* Careful: from this point on 'uptodate' is in the eye |
3654 | * of raid_run_ops which services 'compute' operations | |
3655 | * before writes. R5_Wantcompute flags a block that will | |
3656 | * be R5_UPTODATE by the time it is needed for a | |
3657 | * subsequent operation. | |
3658 | */ | |
5599becc YT |
3659 | s->uptodate++; |
3660 | return 1; | |
3661 | } else if (s->uptodate == disks-2 && s->failed >= 2) { | |
3662 | /* Computing 2-failure is *very* expensive; only | |
3663 | * do it if failed >= 2 | |
3664 | */ | |
3665 | int other; | |
3666 | for (other = disks; other--; ) { | |
3667 | if (other == disk_idx) | |
3668 | continue; | |
3669 | if (!test_bit(R5_UPTODATE, | |
3670 | &sh->dev[other].flags)) | |
3671 | break; | |
a4456856 | 3672 | } |
5599becc YT |
3673 | BUG_ON(other < 0); |
3674 | pr_debug("Computing stripe %llu blocks %d,%d\n", | |
3675 | (unsigned long long)sh->sector, | |
3676 | disk_idx, other); | |
3677 | set_bit(STRIPE_COMPUTE_RUN, &sh->state); | |
3678 | set_bit(STRIPE_OP_COMPUTE_BLK, &s->ops_request); | |
3679 | set_bit(R5_Wantcompute, &sh->dev[disk_idx].flags); | |
3680 | set_bit(R5_Wantcompute, &sh->dev[other].flags); | |
3681 | sh->ops.target = disk_idx; | |
3682 | sh->ops.target2 = other; | |
3683 | s->uptodate += 2; | |
3684 | s->req_compute = 1; | |
3685 | return 1; | |
3686 | } else if (test_bit(R5_Insync, &dev->flags)) { | |
3687 | set_bit(R5_LOCKED, &dev->flags); | |
3688 | set_bit(R5_Wantread, &dev->flags); | |
3689 | s->locked++; | |
3690 | pr_debug("Reading block %d (sync=%d)\n", | |
3691 | disk_idx, s->syncing); | |
a4456856 DW |
3692 | } |
3693 | } | |
5599becc YT |
3694 | |
3695 | return 0; | |
3696 | } | |
3697 | ||
3698 | /** | |
93b3dbce | 3699 | * handle_stripe_fill - read or compute data to satisfy pending requests. |
5599becc | 3700 | */ |
93b3dbce N |
3701 | static void handle_stripe_fill(struct stripe_head *sh, |
3702 | struct stripe_head_state *s, | |
3703 | int disks) | |
5599becc YT |
3704 | { |
3705 | int i; | |
3706 | ||
3707 | /* look for blocks to read/compute, skip this if a compute | |
3708 | * is already in flight, or if the stripe contents are in the | |
3709 | * midst of changing due to a write | |
3710 | */ | |
3711 | if (!test_bit(STRIPE_COMPUTE_RUN, &sh->state) && !sh->check_state && | |
07e83364 SL |
3712 | !sh->reconstruct_state) { |
3713 | ||
3714 | /* | |
3715 | * For degraded stripe with data in journal, do not handle | |
3716 | * read requests yet, instead, flush the stripe to raid | |
3717 | * disks first, this avoids handling complex rmw of write | |
3718 | * back cache (prexor with orig_page, and then xor with | |
3719 | * page) in the read path | |
3720 | */ | |
3721 | if (s->injournal && s->failed) { | |
3722 | if (test_bit(STRIPE_R5C_CACHING, &sh->state)) | |
3723 | r5c_make_stripe_write_out(sh); | |
3724 | goto out; | |
3725 | } | |
3726 | ||
5599becc | 3727 | for (i = disks; i--; ) |
93b3dbce | 3728 | if (fetch_block(sh, s, i, disks)) |
5599becc | 3729 | break; |
07e83364 SL |
3730 | } |
3731 | out: | |
a4456856 DW |
3732 | set_bit(STRIPE_HANDLE, &sh->state); |
3733 | } | |
3734 | ||
787b76fa N |
3735 | static void break_stripe_batch_list(struct stripe_head *head_sh, |
3736 | unsigned long handle_flags); | |
1fe797e6 | 3737 | /* handle_stripe_clean_event |
a4456856 DW |
3738 | * any written block on an uptodate or failed drive can be returned. |
3739 | * Note that if we 'wrote' to a failed drive, it will be UPTODATE, but | |
3740 | * never LOCKED, so we don't need to test 'failed' directly. | |
3741 | */ | |
d1688a6d | 3742 | static void handle_stripe_clean_event(struct r5conf *conf, |
bd83d0a2 | 3743 | struct stripe_head *sh, int disks) |
a4456856 DW |
3744 | { |
3745 | int i; | |
3746 | struct r5dev *dev; | |
f8dfcffd | 3747 | int discard_pending = 0; |
59fc630b | 3748 | struct stripe_head *head_sh = sh; |
3749 | bool do_endio = false; | |
a4456856 DW |
3750 | |
3751 | for (i = disks; i--; ) | |
3752 | if (sh->dev[i].written) { | |
3753 | dev = &sh->dev[i]; | |
3754 | if (!test_bit(R5_LOCKED, &dev->flags) && | |
9e444768 | 3755 | (test_bit(R5_UPTODATE, &dev->flags) || |
d592a996 SL |
3756 | test_bit(R5_Discard, &dev->flags) || |
3757 | test_bit(R5_SkipCopy, &dev->flags))) { | |
a4456856 DW |
3758 | /* We can return any write requests */ |
3759 | struct bio *wbi, *wbi2; | |
45b4233c | 3760 | pr_debug("Return write for disc %d\n", i); |
ca64cae9 N |
3761 | if (test_and_clear_bit(R5_Discard, &dev->flags)) |
3762 | clear_bit(R5_UPTODATE, &dev->flags); | |
d592a996 SL |
3763 | if (test_and_clear_bit(R5_SkipCopy, &dev->flags)) { |
3764 | WARN_ON(test_bit(R5_UPTODATE, &dev->flags)); | |
d592a996 | 3765 | } |
59fc630b | 3766 | do_endio = true; |
3767 | ||
3768 | returnbi: | |
3769 | dev->page = dev->orig_page; | |
a4456856 DW |
3770 | wbi = dev->written; |
3771 | dev->written = NULL; | |
4f024f37 | 3772 | while (wbi && wbi->bi_iter.bi_sector < |
a4456856 DW |
3773 | dev->sector + STRIPE_SECTORS) { |
3774 | wbi2 = r5_next_bio(wbi, dev->sector); | |
49728050 | 3775 | md_write_end(conf->mddev); |
016c76ac | 3776 | bio_endio(wbi); |
a4456856 DW |
3777 | wbi = wbi2; |
3778 | } | |
7eaf7e8e SL |
3779 | bitmap_endwrite(conf->mddev->bitmap, sh->sector, |
3780 | STRIPE_SECTORS, | |
a4456856 | 3781 | !test_bit(STRIPE_DEGRADED, &sh->state), |
7eaf7e8e | 3782 | 0); |
59fc630b | 3783 | if (head_sh->batch_head) { |
3784 | sh = list_first_entry(&sh->batch_list, | |
3785 | struct stripe_head, | |
3786 | batch_list); | |
3787 | if (sh != head_sh) { | |
3788 | dev = &sh->dev[i]; | |
3789 | goto returnbi; | |
3790 | } | |
3791 | } | |
3792 | sh = head_sh; | |
3793 | dev = &sh->dev[i]; | |
f8dfcffd N |
3794 | } else if (test_bit(R5_Discard, &dev->flags)) |
3795 | discard_pending = 1; | |
3796 | } | |
f6bed0ef | 3797 | |
ff875738 | 3798 | log_stripe_write_finished(sh); |
0576b1c6 | 3799 | |
f8dfcffd N |
3800 | if (!discard_pending && |
3801 | test_bit(R5_Discard, &sh->dev[sh->pd_idx].flags)) { | |
b8a9d66d | 3802 | int hash; |
f8dfcffd N |
3803 | clear_bit(R5_Discard, &sh->dev[sh->pd_idx].flags); |
3804 | clear_bit(R5_UPTODATE, &sh->dev[sh->pd_idx].flags); | |
3805 | if (sh->qd_idx >= 0) { | |
3806 | clear_bit(R5_Discard, &sh->dev[sh->qd_idx].flags); | |
3807 | clear_bit(R5_UPTODATE, &sh->dev[sh->qd_idx].flags); | |
3808 | } | |
3809 | /* now that discard is done we can proceed with any sync */ | |
3810 | clear_bit(STRIPE_DISCARD, &sh->state); | |
d47648fc SL |
3811 | /* |
3812 | * SCSI discard will change some bio fields and the stripe has | |
3813 | * no updated data, so remove it from hash list and the stripe | |
3814 | * will be reinitialized | |
3815 | */ | |
59fc630b | 3816 | unhash: |
b8a9d66d RG |
3817 | hash = sh->hash_lock_index; |
3818 | spin_lock_irq(conf->hash_locks + hash); | |
d47648fc | 3819 | remove_hash(sh); |
b8a9d66d | 3820 | spin_unlock_irq(conf->hash_locks + hash); |
59fc630b | 3821 | if (head_sh->batch_head) { |
3822 | sh = list_first_entry(&sh->batch_list, | |
3823 | struct stripe_head, batch_list); | |
3824 | if (sh != head_sh) | |
3825 | goto unhash; | |
3826 | } | |
59fc630b | 3827 | sh = head_sh; |
3828 | ||
f8dfcffd N |
3829 | if (test_bit(STRIPE_SYNC_REQUESTED, &sh->state)) |
3830 | set_bit(STRIPE_HANDLE, &sh->state); | |
3831 | ||
3832 | } | |
8b3e6cdc DW |
3833 | |
3834 | if (test_and_clear_bit(STRIPE_FULL_WRITE, &sh->state)) | |
3835 | if (atomic_dec_and_test(&conf->pending_full_writes)) | |
3836 | md_wakeup_thread(conf->mddev->thread); | |
59fc630b | 3837 | |
787b76fa N |
3838 | if (head_sh->batch_head && do_endio) |
3839 | break_stripe_batch_list(head_sh, STRIPE_EXPAND_SYNC_FLAGS); | |
a4456856 DW |
3840 | } |
3841 | ||
86aa1397 SL |
3842 | /* |
3843 | * For RMW in write back cache, we need extra page in prexor to store the | |
3844 | * old data. This page is stored in dev->orig_page. | |
3845 | * | |
3846 | * This function checks whether we have data for prexor. The exact logic | |
3847 | * is: | |
3848 | * R5_UPTODATE && (!R5_InJournal || R5_OrigPageUPTDODATE) | |
3849 | */ | |
3850 | static inline bool uptodate_for_rmw(struct r5dev *dev) | |
3851 | { | |
3852 | return (test_bit(R5_UPTODATE, &dev->flags)) && | |
3853 | (!test_bit(R5_InJournal, &dev->flags) || | |
3854 | test_bit(R5_OrigPageUPTDODATE, &dev->flags)); | |
3855 | } | |
3856 | ||
d7bd398e SL |
3857 | static int handle_stripe_dirtying(struct r5conf *conf, |
3858 | struct stripe_head *sh, | |
3859 | struct stripe_head_state *s, | |
3860 | int disks) | |
a4456856 DW |
3861 | { |
3862 | int rmw = 0, rcw = 0, i; | |
a7854487 AL |
3863 | sector_t recovery_cp = conf->mddev->recovery_cp; |
3864 | ||
584acdd4 | 3865 | /* Check whether resync is now happening or should start. |
a7854487 AL |
3866 | * If yes, then the array is dirty (after unclean shutdown or |
3867 | * initial creation), so parity in some stripes might be inconsistent. | |
3868 | * In this case, we need to always do reconstruct-write, to ensure | |
3869 | * that in case of drive failure or read-error correction, we | |
3870 | * generate correct data from the parity. | |
3871 | */ | |
584acdd4 | 3872 | if (conf->rmw_level == PARITY_DISABLE_RMW || |
26ac1073 N |
3873 | (recovery_cp < MaxSector && sh->sector >= recovery_cp && |
3874 | s->failed == 0)) { | |
a7854487 | 3875 | /* Calculate the real rcw later - for now make it |
c8ac1803 N |
3876 | * look like rcw is cheaper |
3877 | */ | |
3878 | rcw = 1; rmw = 2; | |
584acdd4 MS |
3879 | pr_debug("force RCW rmw_level=%u, recovery_cp=%llu sh->sector=%llu\n", |
3880 | conf->rmw_level, (unsigned long long)recovery_cp, | |
a7854487 | 3881 | (unsigned long long)sh->sector); |
c8ac1803 | 3882 | } else for (i = disks; i--; ) { |
a4456856 DW |
3883 | /* would I have to read this buffer for read_modify_write */ |
3884 | struct r5dev *dev = &sh->dev[i]; | |
39b99586 | 3885 | if (((dev->towrite && !delay_towrite(conf, dev, s)) || |
07e83364 | 3886 | i == sh->pd_idx || i == sh->qd_idx || |
1e6d690b | 3887 | test_bit(R5_InJournal, &dev->flags)) && |
a4456856 | 3888 | !test_bit(R5_LOCKED, &dev->flags) && |
86aa1397 | 3889 | !(uptodate_for_rmw(dev) || |
f38e1219 | 3890 | test_bit(R5_Wantcompute, &dev->flags))) { |
a4456856 DW |
3891 | if (test_bit(R5_Insync, &dev->flags)) |
3892 | rmw++; | |
3893 | else | |
3894 | rmw += 2*disks; /* cannot read it */ | |
3895 | } | |
3896 | /* Would I have to read this buffer for reconstruct_write */ | |
584acdd4 MS |
3897 | if (!test_bit(R5_OVERWRITE, &dev->flags) && |
3898 | i != sh->pd_idx && i != sh->qd_idx && | |
a4456856 | 3899 | !test_bit(R5_LOCKED, &dev->flags) && |
f38e1219 | 3900 | !(test_bit(R5_UPTODATE, &dev->flags) || |
1e6d690b | 3901 | test_bit(R5_Wantcompute, &dev->flags))) { |
67f45548 N |
3902 | if (test_bit(R5_Insync, &dev->flags)) |
3903 | rcw++; | |
a4456856 DW |
3904 | else |
3905 | rcw += 2*disks; | |
3906 | } | |
3907 | } | |
1e6d690b | 3908 | |
39b99586 SL |
3909 | pr_debug("for sector %llu state 0x%lx, rmw=%d rcw=%d\n", |
3910 | (unsigned long long)sh->sector, sh->state, rmw, rcw); | |
a4456856 | 3911 | set_bit(STRIPE_HANDLE, &sh->state); |
41257580 | 3912 | if ((rmw < rcw || (rmw == rcw && conf->rmw_level == PARITY_PREFER_RMW)) && rmw > 0) { |
a4456856 | 3913 | /* prefer read-modify-write, but need to get some data */ |
e3620a3a JB |
3914 | if (conf->mddev->queue) |
3915 | blk_add_trace_msg(conf->mddev->queue, | |
3916 | "raid5 rmw %llu %d", | |
3917 | (unsigned long long)sh->sector, rmw); | |
a4456856 DW |
3918 | for (i = disks; i--; ) { |
3919 | struct r5dev *dev = &sh->dev[i]; | |
1e6d690b SL |
3920 | if (test_bit(R5_InJournal, &dev->flags) && |
3921 | dev->page == dev->orig_page && | |
3922 | !test_bit(R5_LOCKED, &sh->dev[sh->pd_idx].flags)) { | |
3923 | /* alloc page for prexor */ | |
d7bd398e SL |
3924 | struct page *p = alloc_page(GFP_NOIO); |
3925 | ||
3926 | if (p) { | |
3927 | dev->orig_page = p; | |
3928 | continue; | |
3929 | } | |
3930 | ||
3931 | /* | |
3932 | * alloc_page() failed, try use | |
3933 | * disk_info->extra_page | |
3934 | */ | |
3935 | if (!test_and_set_bit(R5C_EXTRA_PAGE_IN_USE, | |
3936 | &conf->cache_state)) { | |
3937 | r5c_use_extra_page(sh); | |
3938 | break; | |
3939 | } | |
1e6d690b | 3940 | |
d7bd398e SL |
3941 | /* extra_page in use, add to delayed_list */ |
3942 | set_bit(STRIPE_DELAYED, &sh->state); | |
3943 | s->waiting_extra_page = 1; | |
3944 | return -EAGAIN; | |
1e6d690b | 3945 | } |
d7bd398e | 3946 | } |
1e6d690b | 3947 | |
d7bd398e SL |
3948 | for (i = disks; i--; ) { |
3949 | struct r5dev *dev = &sh->dev[i]; | |
39b99586 | 3950 | if (((dev->towrite && !delay_towrite(conf, dev, s)) || |
1e6d690b SL |
3951 | i == sh->pd_idx || i == sh->qd_idx || |
3952 | test_bit(R5_InJournal, &dev->flags)) && | |
a4456856 | 3953 | !test_bit(R5_LOCKED, &dev->flags) && |
86aa1397 | 3954 | !(uptodate_for_rmw(dev) || |
1e6d690b | 3955 | test_bit(R5_Wantcompute, &dev->flags)) && |
a4456856 | 3956 | test_bit(R5_Insync, &dev->flags)) { |
67f45548 N |
3957 | if (test_bit(STRIPE_PREREAD_ACTIVE, |
3958 | &sh->state)) { | |
3959 | pr_debug("Read_old block %d for r-m-w\n", | |
3960 | i); | |
a4456856 DW |
3961 | set_bit(R5_LOCKED, &dev->flags); |
3962 | set_bit(R5_Wantread, &dev->flags); | |
3963 | s->locked++; | |
3964 | } else { | |
3965 | set_bit(STRIPE_DELAYED, &sh->state); | |
3966 | set_bit(STRIPE_HANDLE, &sh->state); | |
3967 | } | |
3968 | } | |
3969 | } | |
a9add5d9 | 3970 | } |
41257580 | 3971 | if ((rcw < rmw || (rcw == rmw && conf->rmw_level != PARITY_PREFER_RMW)) && rcw > 0) { |
a4456856 | 3972 | /* want reconstruct write, but need to get some data */ |
a9add5d9 | 3973 | int qread =0; |
c8ac1803 | 3974 | rcw = 0; |
a4456856 DW |
3975 | for (i = disks; i--; ) { |
3976 | struct r5dev *dev = &sh->dev[i]; | |
3977 | if (!test_bit(R5_OVERWRITE, &dev->flags) && | |
c8ac1803 | 3978 | i != sh->pd_idx && i != sh->qd_idx && |
a4456856 | 3979 | !test_bit(R5_LOCKED, &dev->flags) && |
f38e1219 | 3980 | !(test_bit(R5_UPTODATE, &dev->flags) || |
c8ac1803 N |
3981 | test_bit(R5_Wantcompute, &dev->flags))) { |
3982 | rcw++; | |
67f45548 N |
3983 | if (test_bit(R5_Insync, &dev->flags) && |
3984 | test_bit(STRIPE_PREREAD_ACTIVE, | |
3985 | &sh->state)) { | |
45b4233c | 3986 | pr_debug("Read_old block " |
a4456856 DW |
3987 | "%d for Reconstruct\n", i); |
3988 | set_bit(R5_LOCKED, &dev->flags); | |
3989 | set_bit(R5_Wantread, &dev->flags); | |
3990 | s->locked++; | |
a9add5d9 | 3991 | qread++; |
a4456856 DW |
3992 | } else { |
3993 | set_bit(STRIPE_DELAYED, &sh->state); | |
3994 | set_bit(STRIPE_HANDLE, &sh->state); | |
3995 | } | |
3996 | } | |
3997 | } | |
e3620a3a | 3998 | if (rcw && conf->mddev->queue) |
a9add5d9 N |
3999 | blk_add_trace_msg(conf->mddev->queue, "raid5 rcw %llu %d %d %d", |
4000 | (unsigned long long)sh->sector, | |
4001 | rcw, qread, test_bit(STRIPE_DELAYED, &sh->state)); | |
c8ac1803 | 4002 | } |
b1b02fe9 N |
4003 | |
4004 | if (rcw > disks && rmw > disks && | |
4005 | !test_bit(STRIPE_PREREAD_ACTIVE, &sh->state)) | |
4006 | set_bit(STRIPE_DELAYED, &sh->state); | |
4007 | ||
a4456856 DW |
4008 | /* now if nothing is locked, and if we have enough data, |
4009 | * we can start a write request | |
4010 | */ | |
f38e1219 DW |
4011 | /* since handle_stripe can be called at any time we need to handle the |
4012 | * case where a compute block operation has been submitted and then a | |
ac6b53b6 DW |
4013 | * subsequent call wants to start a write request. raid_run_ops only |
4014 | * handles the case where compute block and reconstruct are requested | |
f38e1219 DW |
4015 | * simultaneously. If this is not the case then new writes need to be |
4016 | * held off until the compute completes. | |
4017 | */ | |
976ea8d4 DW |
4018 | if ((s->req_compute || !test_bit(STRIPE_COMPUTE_RUN, &sh->state)) && |
4019 | (s->locked == 0 && (rcw == 0 || rmw == 0) && | |
1e6d690b | 4020 | !test_bit(STRIPE_BIT_DELAY, &sh->state))) |
c0f7bddb | 4021 | schedule_reconstruction(sh, s, rcw == 0, 0); |
d7bd398e | 4022 | return 0; |
a4456856 DW |
4023 | } |
4024 | ||
d1688a6d | 4025 | static void handle_parity_checks5(struct r5conf *conf, struct stripe_head *sh, |
a4456856 DW |
4026 | struct stripe_head_state *s, int disks) |
4027 | { | |
ecc65c9b | 4028 | struct r5dev *dev = NULL; |
bd2ab670 | 4029 | |
59fc630b | 4030 | BUG_ON(sh->batch_head); |
a4456856 | 4031 | set_bit(STRIPE_HANDLE, &sh->state); |
e89f8962 | 4032 | |
ecc65c9b DW |
4033 | switch (sh->check_state) { |
4034 | case check_state_idle: | |
4035 | /* start a new check operation if there are no failures */ | |
bd2ab670 | 4036 | if (s->failed == 0) { |
bd2ab670 | 4037 | BUG_ON(s->uptodate != disks); |
ecc65c9b DW |
4038 | sh->check_state = check_state_run; |
4039 | set_bit(STRIPE_OP_CHECK, &s->ops_request); | |
bd2ab670 | 4040 | clear_bit(R5_UPTODATE, &sh->dev[sh->pd_idx].flags); |
bd2ab670 | 4041 | s->uptodate--; |
ecc65c9b | 4042 | break; |
bd2ab670 | 4043 | } |
f2b3b44d | 4044 | dev = &sh->dev[s->failed_num[0]]; |
ecc65c9b DW |
4045 | /* fall through */ |
4046 | case check_state_compute_result: | |
4047 | sh->check_state = check_state_idle; | |
4048 | if (!dev) | |
4049 | dev = &sh->dev[sh->pd_idx]; | |
4050 | ||
4051 | /* check that a write has not made the stripe insync */ | |
4052 | if (test_bit(STRIPE_INSYNC, &sh->state)) | |
4053 | break; | |
c8894419 | 4054 | |
a4456856 | 4055 | /* either failed parity check, or recovery is happening */ |
a4456856 DW |
4056 | BUG_ON(!test_bit(R5_UPTODATE, &dev->flags)); |
4057 | BUG_ON(s->uptodate != disks); | |
4058 | ||
4059 | set_bit(R5_LOCKED, &dev->flags); | |
ecc65c9b | 4060 | s->locked++; |
a4456856 | 4061 | set_bit(R5_Wantwrite, &dev->flags); |
830ea016 | 4062 | |
a4456856 | 4063 | clear_bit(STRIPE_DEGRADED, &sh->state); |
a4456856 | 4064 | set_bit(STRIPE_INSYNC, &sh->state); |
ecc65c9b DW |
4065 | break; |
4066 | case check_state_run: | |
4067 | break; /* we will be called again upon completion */ | |
4068 | case check_state_check_result: | |
4069 | sh->check_state = check_state_idle; | |
4070 | ||
4071 | /* if a failure occurred during the check operation, leave | |
4072 | * STRIPE_INSYNC not set and let the stripe be handled again | |
4073 | */ | |
4074 | if (s->failed) | |
4075 | break; | |
4076 | ||
4077 | /* handle a successful check operation, if parity is correct | |
4078 | * we are done. Otherwise update the mismatch count and repair | |
4079 | * parity if !MD_RECOVERY_CHECK | |
4080 | */ | |
ad283ea4 | 4081 | if ((sh->ops.zero_sum_result & SUM_CHECK_P_RESULT) == 0) |
ecc65c9b DW |
4082 | /* parity is correct (on disc, |
4083 | * not in buffer any more) | |
4084 | */ | |
4085 | set_bit(STRIPE_INSYNC, &sh->state); | |
4086 | else { | |
7f7583d4 | 4087 | atomic64_add(STRIPE_SECTORS, &conf->mddev->resync_mismatches); |
ecc65c9b DW |
4088 | if (test_bit(MD_RECOVERY_CHECK, &conf->mddev->recovery)) |
4089 | /* don't try to repair!! */ | |
4090 | set_bit(STRIPE_INSYNC, &sh->state); | |
4091 | else { | |
4092 | sh->check_state = check_state_compute_run; | |
976ea8d4 | 4093 | set_bit(STRIPE_COMPUTE_RUN, &sh->state); |
ecc65c9b DW |
4094 | set_bit(STRIPE_OP_COMPUTE_BLK, &s->ops_request); |
4095 | set_bit(R5_Wantcompute, | |
4096 | &sh->dev[sh->pd_idx].flags); | |
4097 | sh->ops.target = sh->pd_idx; | |
ac6b53b6 | 4098 | sh->ops.target2 = -1; |
ecc65c9b DW |
4099 | s->uptodate++; |
4100 | } | |
4101 | } | |
4102 | break; | |
4103 | case check_state_compute_run: | |
4104 | break; | |
4105 | default: | |
cc6167b4 | 4106 | pr_err("%s: unknown check_state: %d sector: %llu\n", |
ecc65c9b DW |
4107 | __func__, sh->check_state, |
4108 | (unsigned long long) sh->sector); | |
4109 | BUG(); | |
a4456856 DW |
4110 | } |
4111 | } | |
4112 | ||
d1688a6d | 4113 | static void handle_parity_checks6(struct r5conf *conf, struct stripe_head *sh, |
36d1c647 | 4114 | struct stripe_head_state *s, |
f2b3b44d | 4115 | int disks) |
a4456856 | 4116 | { |
a4456856 | 4117 | int pd_idx = sh->pd_idx; |
34e04e87 | 4118 | int qd_idx = sh->qd_idx; |
d82dfee0 | 4119 | struct r5dev *dev; |
a4456856 | 4120 | |
59fc630b | 4121 | BUG_ON(sh->batch_head); |
a4456856 DW |
4122 | set_bit(STRIPE_HANDLE, &sh->state); |
4123 | ||
4124 | BUG_ON(s->failed > 2); | |
d82dfee0 | 4125 | |
a4456856 DW |
4126 | /* Want to check and possibly repair P and Q. |
4127 | * However there could be one 'failed' device, in which | |
4128 | * case we can only check one of them, possibly using the | |
4129 | * other to generate missing data | |
4130 | */ | |
4131 | ||
d82dfee0 DW |
4132 | switch (sh->check_state) { |
4133 | case check_state_idle: | |
4134 | /* start a new check operation if there are < 2 failures */ | |
f2b3b44d | 4135 | if (s->failed == s->q_failed) { |
d82dfee0 | 4136 | /* The only possible failed device holds Q, so it |
a4456856 DW |
4137 | * makes sense to check P (If anything else were failed, |
4138 | * we would have used P to recreate it). | |
4139 | */ | |
d82dfee0 | 4140 | sh->check_state = check_state_run; |
a4456856 | 4141 | } |
f2b3b44d | 4142 | if (!s->q_failed && s->failed < 2) { |
d82dfee0 | 4143 | /* Q is not failed, and we didn't use it to generate |
a4456856 DW |
4144 | * anything, so it makes sense to check it |
4145 | */ | |
d82dfee0 DW |
4146 | if (sh->check_state == check_state_run) |
4147 | sh->check_state = check_state_run_pq; | |
4148 | else | |
4149 | sh->check_state = check_state_run_q; | |
a4456856 | 4150 | } |
a4456856 | 4151 | |
d82dfee0 DW |
4152 | /* discard potentially stale zero_sum_result */ |
4153 | sh->ops.zero_sum_result = 0; | |
a4456856 | 4154 | |
d82dfee0 DW |
4155 | if (sh->check_state == check_state_run) { |
4156 | /* async_xor_zero_sum destroys the contents of P */ | |
4157 | clear_bit(R5_UPTODATE, &sh->dev[pd_idx].flags); | |
4158 | s->uptodate--; | |
a4456856 | 4159 | } |
d82dfee0 DW |
4160 | if (sh->check_state >= check_state_run && |
4161 | sh->check_state <= check_state_run_pq) { | |
4162 | /* async_syndrome_zero_sum preserves P and Q, so | |
4163 | * no need to mark them !uptodate here | |
4164 | */ | |
4165 | set_bit(STRIPE_OP_CHECK, &s->ops_request); | |
4166 | break; | |
a4456856 DW |
4167 | } |
4168 | ||
d82dfee0 DW |
4169 | /* we have 2-disk failure */ |
4170 | BUG_ON(s->failed != 2); | |
4171 | /* fall through */ | |
4172 | case check_state_compute_result: | |
4173 | sh->check_state = check_state_idle; | |
a4456856 | 4174 | |
d82dfee0 DW |
4175 | /* check that a write has not made the stripe insync */ |
4176 | if (test_bit(STRIPE_INSYNC, &sh->state)) | |
4177 | break; | |
a4456856 DW |
4178 | |
4179 | /* now write out any block on a failed drive, | |
d82dfee0 | 4180 | * or P or Q if they were recomputed |
a4456856 | 4181 | */ |
d82dfee0 | 4182 | BUG_ON(s->uptodate < disks - 1); /* We don't need Q to recover */ |
a4456856 | 4183 | if (s->failed == 2) { |
f2b3b44d | 4184 | dev = &sh->dev[s->failed_num[1]]; |
a4456856 DW |
4185 | s->locked++; |
4186 | set_bit(R5_LOCKED, &dev->flags); | |
4187 | set_bit(R5_Wantwrite, &dev->flags); | |
4188 | } | |
4189 | if (s->failed >= 1) { | |
f2b3b44d | 4190 | dev = &sh->dev[s->failed_num[0]]; |
a4456856 DW |
4191 | s->locked++; |
4192 | set_bit(R5_LOCKED, &dev->flags); | |
4193 | set_bit(R5_Wantwrite, &dev->flags); | |
4194 | } | |
d82dfee0 | 4195 | if (sh->ops.zero_sum_result & SUM_CHECK_P_RESULT) { |
a4456856 DW |
4196 | dev = &sh->dev[pd_idx]; |
4197 | s->locked++; | |
4198 | set_bit(R5_LOCKED, &dev->flags); | |
4199 | set_bit(R5_Wantwrite, &dev->flags); | |
4200 | } | |
d82dfee0 | 4201 | if (sh->ops.zero_sum_result & SUM_CHECK_Q_RESULT) { |
a4456856 DW |
4202 | dev = &sh->dev[qd_idx]; |
4203 | s->locked++; | |
4204 | set_bit(R5_LOCKED, &dev->flags); | |
4205 | set_bit(R5_Wantwrite, &dev->flags); | |
4206 | } | |
4207 | clear_bit(STRIPE_DEGRADED, &sh->state); | |
4208 | ||
4209 | set_bit(STRIPE_INSYNC, &sh->state); | |
d82dfee0 DW |
4210 | break; |
4211 | case check_state_run: | |
4212 | case check_state_run_q: | |
4213 | case check_state_run_pq: | |
4214 | break; /* we will be called again upon completion */ | |
4215 | case check_state_check_result: | |
4216 | sh->check_state = check_state_idle; | |
4217 | ||
4218 | /* handle a successful check operation, if parity is correct | |
4219 | * we are done. Otherwise update the mismatch count and repair | |
4220 | * parity if !MD_RECOVERY_CHECK | |
4221 | */ | |
4222 | if (sh->ops.zero_sum_result == 0) { | |
4223 | /* both parities are correct */ | |
4224 | if (!s->failed) | |
4225 | set_bit(STRIPE_INSYNC, &sh->state); | |
4226 | else { | |
4227 | /* in contrast to the raid5 case we can validate | |
4228 | * parity, but still have a failure to write | |
4229 | * back | |
4230 | */ | |
4231 | sh->check_state = check_state_compute_result; | |
4232 | /* Returning at this point means that we may go | |
4233 | * off and bring p and/or q uptodate again so | |
4234 | * we make sure to check zero_sum_result again | |
4235 | * to verify if p or q need writeback | |
4236 | */ | |
4237 | } | |
4238 | } else { | |
7f7583d4 | 4239 | atomic64_add(STRIPE_SECTORS, &conf->mddev->resync_mismatches); |
d82dfee0 DW |
4240 | if (test_bit(MD_RECOVERY_CHECK, &conf->mddev->recovery)) |
4241 | /* don't try to repair!! */ | |
4242 | set_bit(STRIPE_INSYNC, &sh->state); | |
4243 | else { | |
4244 | int *target = &sh->ops.target; | |
4245 | ||
4246 | sh->ops.target = -1; | |
4247 | sh->ops.target2 = -1; | |
4248 | sh->check_state = check_state_compute_run; | |
4249 | set_bit(STRIPE_COMPUTE_RUN, &sh->state); | |
4250 | set_bit(STRIPE_OP_COMPUTE_BLK, &s->ops_request); | |
4251 | if (sh->ops.zero_sum_result & SUM_CHECK_P_RESULT) { | |
4252 | set_bit(R5_Wantcompute, | |
4253 | &sh->dev[pd_idx].flags); | |
4254 | *target = pd_idx; | |
4255 | target = &sh->ops.target2; | |
4256 | s->uptodate++; | |
4257 | } | |
4258 | if (sh->ops.zero_sum_result & SUM_CHECK_Q_RESULT) { | |
4259 | set_bit(R5_Wantcompute, | |
4260 | &sh->dev[qd_idx].flags); | |
4261 | *target = qd_idx; | |
4262 | s->uptodate++; | |
4263 | } | |
4264 | } | |
4265 | } | |
4266 | break; | |
4267 | case check_state_compute_run: | |
4268 | break; | |
4269 | default: | |
cc6167b4 N |
4270 | pr_warn("%s: unknown check_state: %d sector: %llu\n", |
4271 | __func__, sh->check_state, | |
4272 | (unsigned long long) sh->sector); | |
d82dfee0 | 4273 | BUG(); |
a4456856 DW |
4274 | } |
4275 | } | |
4276 | ||
d1688a6d | 4277 | static void handle_stripe_expansion(struct r5conf *conf, struct stripe_head *sh) |
a4456856 DW |
4278 | { |
4279 | int i; | |
4280 | ||
4281 | /* We have read all the blocks in this stripe and now we need to | |
4282 | * copy some of them into a target stripe for expand. | |
4283 | */ | |
f0a50d37 | 4284 | struct dma_async_tx_descriptor *tx = NULL; |
59fc630b | 4285 | BUG_ON(sh->batch_head); |
a4456856 DW |
4286 | clear_bit(STRIPE_EXPAND_SOURCE, &sh->state); |
4287 | for (i = 0; i < sh->disks; i++) | |
34e04e87 | 4288 | if (i != sh->pd_idx && i != sh->qd_idx) { |
911d4ee8 | 4289 | int dd_idx, j; |
a4456856 | 4290 | struct stripe_head *sh2; |
a08abd8c | 4291 | struct async_submit_ctl submit; |
a4456856 | 4292 | |
6d036f7d | 4293 | sector_t bn = raid5_compute_blocknr(sh, i, 1); |
911d4ee8 N |
4294 | sector_t s = raid5_compute_sector(conf, bn, 0, |
4295 | &dd_idx, NULL); | |
6d036f7d | 4296 | sh2 = raid5_get_active_stripe(conf, s, 0, 1, 1); |
a4456856 DW |
4297 | if (sh2 == NULL) |
4298 | /* so far only the early blocks of this stripe | |
4299 | * have been requested. When later blocks | |
4300 | * get requested, we will try again | |
4301 | */ | |
4302 | continue; | |
4303 | if (!test_bit(STRIPE_EXPANDING, &sh2->state) || | |
4304 | test_bit(R5_Expanded, &sh2->dev[dd_idx].flags)) { | |
4305 | /* must have already done this block */ | |
6d036f7d | 4306 | raid5_release_stripe(sh2); |
a4456856 DW |
4307 | continue; |
4308 | } | |
f0a50d37 DW |
4309 | |
4310 | /* place all the copies on one channel */ | |
a08abd8c | 4311 | init_async_submit(&submit, 0, tx, NULL, NULL, NULL); |
f0a50d37 | 4312 | tx = async_memcpy(sh2->dev[dd_idx].page, |
88ba2aa5 | 4313 | sh->dev[i].page, 0, 0, STRIPE_SIZE, |
a08abd8c | 4314 | &submit); |
f0a50d37 | 4315 | |
a4456856 DW |
4316 | set_bit(R5_Expanded, &sh2->dev[dd_idx].flags); |
4317 | set_bit(R5_UPTODATE, &sh2->dev[dd_idx].flags); | |
4318 | for (j = 0; j < conf->raid_disks; j++) | |
4319 | if (j != sh2->pd_idx && | |
86c374ba | 4320 | j != sh2->qd_idx && |
a4456856 DW |
4321 | !test_bit(R5_Expanded, &sh2->dev[j].flags)) |
4322 | break; | |
4323 | if (j == conf->raid_disks) { | |
4324 | set_bit(STRIPE_EXPAND_READY, &sh2->state); | |
4325 | set_bit(STRIPE_HANDLE, &sh2->state); | |
4326 | } | |
6d036f7d | 4327 | raid5_release_stripe(sh2); |
f0a50d37 | 4328 | |
a4456856 | 4329 | } |
a2e08551 | 4330 | /* done submitting copies, wait for them to complete */ |
749586b7 | 4331 | async_tx_quiesce(&tx); |
a4456856 | 4332 | } |
1da177e4 LT |
4333 | |
4334 | /* | |
4335 | * handle_stripe - do things to a stripe. | |
4336 | * | |
9a3e1101 N |
4337 | * We lock the stripe by setting STRIPE_ACTIVE and then examine the |
4338 | * state of various bits to see what needs to be done. | |
1da177e4 | 4339 | * Possible results: |
9a3e1101 N |
4340 | * return some read requests which now have data |
4341 | * return some write requests which are safely on storage | |
1da177e4 LT |
4342 | * schedule a read on some buffers |
4343 | * schedule a write of some buffers | |
4344 | * return confirmation of parity correctness | |
4345 | * | |
1da177e4 | 4346 | */ |
a4456856 | 4347 | |
acfe726b | 4348 | static void analyse_stripe(struct stripe_head *sh, struct stripe_head_state *s) |
1da177e4 | 4349 | { |
d1688a6d | 4350 | struct r5conf *conf = sh->raid_conf; |
f416885e | 4351 | int disks = sh->disks; |
474af965 N |
4352 | struct r5dev *dev; |
4353 | int i; | |
9a3e1101 | 4354 | int do_recovery = 0; |
1da177e4 | 4355 | |
acfe726b N |
4356 | memset(s, 0, sizeof(*s)); |
4357 | ||
dabc4ec6 | 4358 | s->expanding = test_bit(STRIPE_EXPAND_SOURCE, &sh->state) && !sh->batch_head; |
4359 | s->expanded = test_bit(STRIPE_EXPAND_READY, &sh->state) && !sh->batch_head; | |
acfe726b N |
4360 | s->failed_num[0] = -1; |
4361 | s->failed_num[1] = -1; | |
6e74a9cf | 4362 | s->log_failed = r5l_log_disk_error(conf); |
1da177e4 | 4363 | |
acfe726b | 4364 | /* Now to look around and see what can be done */ |
1da177e4 | 4365 | rcu_read_lock(); |
16a53ecc | 4366 | for (i=disks; i--; ) { |
3cb03002 | 4367 | struct md_rdev *rdev; |
31c176ec N |
4368 | sector_t first_bad; |
4369 | int bad_sectors; | |
4370 | int is_bad = 0; | |
acfe726b | 4371 | |
16a53ecc | 4372 | dev = &sh->dev[i]; |
1da177e4 | 4373 | |
45b4233c | 4374 | pr_debug("check %d: state 0x%lx read %p write %p written %p\n", |
9a3e1101 N |
4375 | i, dev->flags, |
4376 | dev->toread, dev->towrite, dev->written); | |
6c0069c0 YT |
4377 | /* maybe we can reply to a read |
4378 | * | |
4379 | * new wantfill requests are only permitted while | |
4380 | * ops_complete_biofill is guaranteed to be inactive | |
4381 | */ | |
4382 | if (test_bit(R5_UPTODATE, &dev->flags) && dev->toread && | |
4383 | !test_bit(STRIPE_BIOFILL_RUN, &sh->state)) | |
4384 | set_bit(R5_Wantfill, &dev->flags); | |
1da177e4 | 4385 | |
16a53ecc | 4386 | /* now count some things */ |
cc94015a N |
4387 | if (test_bit(R5_LOCKED, &dev->flags)) |
4388 | s->locked++; | |
4389 | if (test_bit(R5_UPTODATE, &dev->flags)) | |
4390 | s->uptodate++; | |
2d6e4ecc | 4391 | if (test_bit(R5_Wantcompute, &dev->flags)) { |
cc94015a N |
4392 | s->compute++; |
4393 | BUG_ON(s->compute > 2); | |
2d6e4ecc | 4394 | } |
1da177e4 | 4395 | |
acfe726b | 4396 | if (test_bit(R5_Wantfill, &dev->flags)) |
cc94015a | 4397 | s->to_fill++; |
acfe726b | 4398 | else if (dev->toread) |
cc94015a | 4399 | s->to_read++; |
16a53ecc | 4400 | if (dev->towrite) { |
cc94015a | 4401 | s->to_write++; |
16a53ecc | 4402 | if (!test_bit(R5_OVERWRITE, &dev->flags)) |
cc94015a | 4403 | s->non_overwrite++; |
16a53ecc | 4404 | } |
a4456856 | 4405 | if (dev->written) |
cc94015a | 4406 | s->written++; |
14a75d3e N |
4407 | /* Prefer to use the replacement for reads, but only |
4408 | * if it is recovered enough and has no bad blocks. | |
4409 | */ | |
4410 | rdev = rcu_dereference(conf->disks[i].replacement); | |
4411 | if (rdev && !test_bit(Faulty, &rdev->flags) && | |
4412 | rdev->recovery_offset >= sh->sector + STRIPE_SECTORS && | |
4413 | !is_badblock(rdev, sh->sector, STRIPE_SECTORS, | |
4414 | &first_bad, &bad_sectors)) | |
4415 | set_bit(R5_ReadRepl, &dev->flags); | |
4416 | else { | |
e6030cb0 | 4417 | if (rdev && !test_bit(Faulty, &rdev->flags)) |
9a3e1101 | 4418 | set_bit(R5_NeedReplace, &dev->flags); |
e6030cb0 N |
4419 | else |
4420 | clear_bit(R5_NeedReplace, &dev->flags); | |
14a75d3e N |
4421 | rdev = rcu_dereference(conf->disks[i].rdev); |
4422 | clear_bit(R5_ReadRepl, &dev->flags); | |
4423 | } | |
9283d8c5 N |
4424 | if (rdev && test_bit(Faulty, &rdev->flags)) |
4425 | rdev = NULL; | |
31c176ec N |
4426 | if (rdev) { |
4427 | is_bad = is_badblock(rdev, sh->sector, STRIPE_SECTORS, | |
4428 | &first_bad, &bad_sectors); | |
4429 | if (s->blocked_rdev == NULL | |
4430 | && (test_bit(Blocked, &rdev->flags) | |
4431 | || is_bad < 0)) { | |
4432 | if (is_bad < 0) | |
4433 | set_bit(BlockedBadBlocks, | |
4434 | &rdev->flags); | |
4435 | s->blocked_rdev = rdev; | |
4436 | atomic_inc(&rdev->nr_pending); | |
4437 | } | |
6bfe0b49 | 4438 | } |
415e72d0 N |
4439 | clear_bit(R5_Insync, &dev->flags); |
4440 | if (!rdev) | |
4441 | /* Not in-sync */; | |
31c176ec N |
4442 | else if (is_bad) { |
4443 | /* also not in-sync */ | |
18b9837e N |
4444 | if (!test_bit(WriteErrorSeen, &rdev->flags) && |
4445 | test_bit(R5_UPTODATE, &dev->flags)) { | |
31c176ec N |
4446 | /* treat as in-sync, but with a read error |
4447 | * which we can now try to correct | |
4448 | */ | |
4449 | set_bit(R5_Insync, &dev->flags); | |
4450 | set_bit(R5_ReadError, &dev->flags); | |
4451 | } | |
4452 | } else if (test_bit(In_sync, &rdev->flags)) | |
415e72d0 | 4453 | set_bit(R5_Insync, &dev->flags); |
30d7a483 | 4454 | else if (sh->sector + STRIPE_SECTORS <= rdev->recovery_offset) |
415e72d0 | 4455 | /* in sync if before recovery_offset */ |
30d7a483 N |
4456 | set_bit(R5_Insync, &dev->flags); |
4457 | else if (test_bit(R5_UPTODATE, &dev->flags) && | |
4458 | test_bit(R5_Expanded, &dev->flags)) | |
4459 | /* If we've reshaped into here, we assume it is Insync. | |
4460 | * We will shortly update recovery_offset to make | |
4461 | * it official. | |
4462 | */ | |
4463 | set_bit(R5_Insync, &dev->flags); | |
4464 | ||
1cc03eb9 | 4465 | if (test_bit(R5_WriteError, &dev->flags)) { |
14a75d3e N |
4466 | /* This flag does not apply to '.replacement' |
4467 | * only to .rdev, so make sure to check that*/ | |
4468 | struct md_rdev *rdev2 = rcu_dereference( | |
4469 | conf->disks[i].rdev); | |
4470 | if (rdev2 == rdev) | |
4471 | clear_bit(R5_Insync, &dev->flags); | |
4472 | if (rdev2 && !test_bit(Faulty, &rdev2->flags)) { | |
bc2607f3 | 4473 | s->handle_bad_blocks = 1; |
14a75d3e | 4474 | atomic_inc(&rdev2->nr_pending); |
bc2607f3 N |
4475 | } else |
4476 | clear_bit(R5_WriteError, &dev->flags); | |
4477 | } | |
1cc03eb9 | 4478 | if (test_bit(R5_MadeGood, &dev->flags)) { |
14a75d3e N |
4479 | /* This flag does not apply to '.replacement' |
4480 | * only to .rdev, so make sure to check that*/ | |
4481 | struct md_rdev *rdev2 = rcu_dereference( | |
4482 | conf->disks[i].rdev); | |
4483 | if (rdev2 && !test_bit(Faulty, &rdev2->flags)) { | |
b84db560 | 4484 | s->handle_bad_blocks = 1; |
14a75d3e | 4485 | atomic_inc(&rdev2->nr_pending); |
b84db560 N |
4486 | } else |
4487 | clear_bit(R5_MadeGood, &dev->flags); | |
4488 | } | |
977df362 N |
4489 | if (test_bit(R5_MadeGoodRepl, &dev->flags)) { |
4490 | struct md_rdev *rdev2 = rcu_dereference( | |
4491 | conf->disks[i].replacement); | |
4492 | if (rdev2 && !test_bit(Faulty, &rdev2->flags)) { | |
4493 | s->handle_bad_blocks = 1; | |
4494 | atomic_inc(&rdev2->nr_pending); | |
4495 | } else | |
4496 | clear_bit(R5_MadeGoodRepl, &dev->flags); | |
4497 | } | |
415e72d0 | 4498 | if (!test_bit(R5_Insync, &dev->flags)) { |
16a53ecc N |
4499 | /* The ReadError flag will just be confusing now */ |
4500 | clear_bit(R5_ReadError, &dev->flags); | |
4501 | clear_bit(R5_ReWrite, &dev->flags); | |
1da177e4 | 4502 | } |
415e72d0 N |
4503 | if (test_bit(R5_ReadError, &dev->flags)) |
4504 | clear_bit(R5_Insync, &dev->flags); | |
4505 | if (!test_bit(R5_Insync, &dev->flags)) { | |
cc94015a N |
4506 | if (s->failed < 2) |
4507 | s->failed_num[s->failed] = i; | |
4508 | s->failed++; | |
9a3e1101 N |
4509 | if (rdev && !test_bit(Faulty, &rdev->flags)) |
4510 | do_recovery = 1; | |
415e72d0 | 4511 | } |
2ded3703 SL |
4512 | |
4513 | if (test_bit(R5_InJournal, &dev->flags)) | |
4514 | s->injournal++; | |
1e6d690b SL |
4515 | if (test_bit(R5_InJournal, &dev->flags) && dev->written) |
4516 | s->just_cached++; | |
1da177e4 | 4517 | } |
9a3e1101 N |
4518 | if (test_bit(STRIPE_SYNCING, &sh->state)) { |
4519 | /* If there is a failed device being replaced, | |
4520 | * we must be recovering. | |
4521 | * else if we are after recovery_cp, we must be syncing | |
c6d2e084 | 4522 | * else if MD_RECOVERY_REQUESTED is set, we also are syncing. |
9a3e1101 N |
4523 | * else we can only be replacing |
4524 | * sync and recovery both need to read all devices, and so | |
4525 | * use the same flag. | |
4526 | */ | |
4527 | if (do_recovery || | |
c6d2e084 | 4528 | sh->sector >= conf->mddev->recovery_cp || |
4529 | test_bit(MD_RECOVERY_REQUESTED, &(conf->mddev->recovery))) | |
9a3e1101 N |
4530 | s->syncing = 1; |
4531 | else | |
4532 | s->replacing = 1; | |
4533 | } | |
1da177e4 | 4534 | rcu_read_unlock(); |
cc94015a N |
4535 | } |
4536 | ||
59fc630b | 4537 | static int clear_batch_ready(struct stripe_head *sh) |
4538 | { | |
b15a9dbd N |
4539 | /* Return '1' if this is a member of batch, or |
4540 | * '0' if it is a lone stripe or a head which can now be | |
4541 | * handled. | |
4542 | */ | |
59fc630b | 4543 | struct stripe_head *tmp; |
4544 | if (!test_and_clear_bit(STRIPE_BATCH_READY, &sh->state)) | |
b15a9dbd | 4545 | return (sh->batch_head && sh->batch_head != sh); |
59fc630b | 4546 | spin_lock(&sh->stripe_lock); |
4547 | if (!sh->batch_head) { | |
4548 | spin_unlock(&sh->stripe_lock); | |
4549 | return 0; | |
4550 | } | |
4551 | ||
4552 | /* | |
4553 | * this stripe could be added to a batch list before we check | |
4554 | * BATCH_READY, skips it | |
4555 | */ | |
4556 | if (sh->batch_head != sh) { | |
4557 | spin_unlock(&sh->stripe_lock); | |
4558 | return 1; | |
4559 | } | |
4560 | spin_lock(&sh->batch_lock); | |
4561 | list_for_each_entry(tmp, &sh->batch_list, batch_list) | |
4562 | clear_bit(STRIPE_BATCH_READY, &tmp->state); | |
4563 | spin_unlock(&sh->batch_lock); | |
4564 | spin_unlock(&sh->stripe_lock); | |
4565 | ||
4566 | /* | |
4567 | * BATCH_READY is cleared, no new stripes can be added. | |
4568 | * batch_list can be accessed without lock | |
4569 | */ | |
4570 | return 0; | |
4571 | } | |
4572 | ||
3960ce79 N |
4573 | static void break_stripe_batch_list(struct stripe_head *head_sh, |
4574 | unsigned long handle_flags) | |
72ac7330 | 4575 | { |
4e3d62ff | 4576 | struct stripe_head *sh, *next; |
72ac7330 | 4577 | int i; |
fb642b92 | 4578 | int do_wakeup = 0; |
72ac7330 | 4579 | |
bb27051f N |
4580 | list_for_each_entry_safe(sh, next, &head_sh->batch_list, batch_list) { |
4581 | ||
72ac7330 | 4582 | list_del_init(&sh->batch_list); |
4583 | ||
fb3229d5 | 4584 | WARN_ONCE(sh->state & ((1 << STRIPE_ACTIVE) | |
1b956f7a N |
4585 | (1 << STRIPE_SYNCING) | |
4586 | (1 << STRIPE_REPLACED) | | |
1b956f7a N |
4587 | (1 << STRIPE_DELAYED) | |
4588 | (1 << STRIPE_BIT_DELAY) | | |
4589 | (1 << STRIPE_FULL_WRITE) | | |
4590 | (1 << STRIPE_BIOFILL_RUN) | | |
4591 | (1 << STRIPE_COMPUTE_RUN) | | |
4592 | (1 << STRIPE_OPS_REQ_PENDING) | | |
4593 | (1 << STRIPE_DISCARD) | | |
4594 | (1 << STRIPE_BATCH_READY) | | |
4595 | (1 << STRIPE_BATCH_ERR) | | |
fb3229d5 SL |
4596 | (1 << STRIPE_BITMAP_PENDING)), |
4597 | "stripe state: %lx\n", sh->state); | |
4598 | WARN_ONCE(head_sh->state & ((1 << STRIPE_DISCARD) | | |
4599 | (1 << STRIPE_REPLACED)), | |
4600 | "head stripe state: %lx\n", head_sh->state); | |
1b956f7a N |
4601 | |
4602 | set_mask_bits(&sh->state, ~(STRIPE_EXPAND_SYNC_FLAGS | | |
550da24f | 4603 | (1 << STRIPE_PREREAD_ACTIVE) | |
1b956f7a N |
4604 | (1 << STRIPE_DEGRADED)), |
4605 | head_sh->state & (1 << STRIPE_INSYNC)); | |
4606 | ||
72ac7330 | 4607 | sh->check_state = head_sh->check_state; |
4608 | sh->reconstruct_state = head_sh->reconstruct_state; | |
fb642b92 N |
4609 | for (i = 0; i < sh->disks; i++) { |
4610 | if (test_and_clear_bit(R5_Overlap, &sh->dev[i].flags)) | |
4611 | do_wakeup = 1; | |
72ac7330 | 4612 | sh->dev[i].flags = head_sh->dev[i].flags & |
4613 | (~((1 << R5_WriteError) | (1 << R5_Overlap))); | |
fb642b92 | 4614 | } |
72ac7330 | 4615 | spin_lock_irq(&sh->stripe_lock); |
4616 | sh->batch_head = NULL; | |
4617 | spin_unlock_irq(&sh->stripe_lock); | |
3960ce79 N |
4618 | if (handle_flags == 0 || |
4619 | sh->state & handle_flags) | |
4620 | set_bit(STRIPE_HANDLE, &sh->state); | |
6d036f7d | 4621 | raid5_release_stripe(sh); |
72ac7330 | 4622 | } |
fb642b92 N |
4623 | spin_lock_irq(&head_sh->stripe_lock); |
4624 | head_sh->batch_head = NULL; | |
4625 | spin_unlock_irq(&head_sh->stripe_lock); | |
4626 | for (i = 0; i < head_sh->disks; i++) | |
4627 | if (test_and_clear_bit(R5_Overlap, &head_sh->dev[i].flags)) | |
4628 | do_wakeup = 1; | |
3960ce79 N |
4629 | if (head_sh->state & handle_flags) |
4630 | set_bit(STRIPE_HANDLE, &head_sh->state); | |
fb642b92 N |
4631 | |
4632 | if (do_wakeup) | |
4633 | wake_up(&head_sh->raid_conf->wait_for_overlap); | |
72ac7330 | 4634 | } |
4635 | ||
cc94015a N |
4636 | static void handle_stripe(struct stripe_head *sh) |
4637 | { | |
4638 | struct stripe_head_state s; | |
d1688a6d | 4639 | struct r5conf *conf = sh->raid_conf; |
3687c061 | 4640 | int i; |
84789554 N |
4641 | int prexor; |
4642 | int disks = sh->disks; | |
474af965 | 4643 | struct r5dev *pdev, *qdev; |
cc94015a N |
4644 | |
4645 | clear_bit(STRIPE_HANDLE, &sh->state); | |
257a4b42 | 4646 | if (test_and_set_bit_lock(STRIPE_ACTIVE, &sh->state)) { |
cc94015a N |
4647 | /* already being handled, ensure it gets handled |
4648 | * again when current action finishes */ | |
4649 | set_bit(STRIPE_HANDLE, &sh->state); | |
4650 | return; | |
4651 | } | |
4652 | ||
59fc630b | 4653 | if (clear_batch_ready(sh) ) { |
4654 | clear_bit_unlock(STRIPE_ACTIVE, &sh->state); | |
4655 | return; | |
4656 | } | |
4657 | ||
4e3d62ff | 4658 | if (test_and_clear_bit(STRIPE_BATCH_ERR, &sh->state)) |
3960ce79 | 4659 | break_stripe_batch_list(sh, 0); |
72ac7330 | 4660 | |
dabc4ec6 | 4661 | if (test_bit(STRIPE_SYNC_REQUESTED, &sh->state) && !sh->batch_head) { |
f8dfcffd | 4662 | spin_lock(&sh->stripe_lock); |
5ddf0440 SL |
4663 | /* |
4664 | * Cannot process 'sync' concurrently with 'discard'. | |
4665 | * Flush data in r5cache before 'sync'. | |
4666 | */ | |
4667 | if (!test_bit(STRIPE_R5C_PARTIAL_STRIPE, &sh->state) && | |
4668 | !test_bit(STRIPE_R5C_FULL_STRIPE, &sh->state) && | |
4669 | !test_bit(STRIPE_DISCARD, &sh->state) && | |
f8dfcffd N |
4670 | test_and_clear_bit(STRIPE_SYNC_REQUESTED, &sh->state)) { |
4671 | set_bit(STRIPE_SYNCING, &sh->state); | |
4672 | clear_bit(STRIPE_INSYNC, &sh->state); | |
f94c0b66 | 4673 | clear_bit(STRIPE_REPLACED, &sh->state); |
f8dfcffd N |
4674 | } |
4675 | spin_unlock(&sh->stripe_lock); | |
cc94015a N |
4676 | } |
4677 | clear_bit(STRIPE_DELAYED, &sh->state); | |
4678 | ||
4679 | pr_debug("handling stripe %llu, state=%#lx cnt=%d, " | |
4680 | "pd_idx=%d, qd_idx=%d\n, check:%d, reconstruct:%d\n", | |
4681 | (unsigned long long)sh->sector, sh->state, | |
4682 | atomic_read(&sh->count), sh->pd_idx, sh->qd_idx, | |
4683 | sh->check_state, sh->reconstruct_state); | |
3687c061 | 4684 | |
acfe726b | 4685 | analyse_stripe(sh, &s); |
c5a31000 | 4686 | |
b70abcb2 SL |
4687 | if (test_bit(STRIPE_LOG_TRAPPED, &sh->state)) |
4688 | goto finish; | |
4689 | ||
16d997b7 N |
4690 | if (s.handle_bad_blocks || |
4691 | test_bit(MD_SB_CHANGE_PENDING, &conf->mddev->sb_flags)) { | |
bc2607f3 N |
4692 | set_bit(STRIPE_HANDLE, &sh->state); |
4693 | goto finish; | |
4694 | } | |
4695 | ||
474af965 N |
4696 | if (unlikely(s.blocked_rdev)) { |
4697 | if (s.syncing || s.expanding || s.expanded || | |
9a3e1101 | 4698 | s.replacing || s.to_write || s.written) { |
474af965 N |
4699 | set_bit(STRIPE_HANDLE, &sh->state); |
4700 | goto finish; | |
4701 | } | |
4702 | /* There is nothing for the blocked_rdev to block */ | |
4703 | rdev_dec_pending(s.blocked_rdev, conf->mddev); | |
4704 | s.blocked_rdev = NULL; | |
4705 | } | |
4706 | ||
4707 | if (s.to_fill && !test_bit(STRIPE_BIOFILL_RUN, &sh->state)) { | |
4708 | set_bit(STRIPE_OP_BIOFILL, &s.ops_request); | |
4709 | set_bit(STRIPE_BIOFILL_RUN, &sh->state); | |
4710 | } | |
4711 | ||
4712 | pr_debug("locked=%d uptodate=%d to_read=%d" | |
4713 | " to_write=%d failed=%d failed_num=%d,%d\n", | |
4714 | s.locked, s.uptodate, s.to_read, s.to_write, s.failed, | |
4715 | s.failed_num[0], s.failed_num[1]); | |
70d466f7 SL |
4716 | /* |
4717 | * check if the array has lost more than max_degraded devices and, | |
474af965 | 4718 | * if so, some requests might need to be failed. |
70d466f7 SL |
4719 | * |
4720 | * When journal device failed (log_failed), we will only process | |
4721 | * the stripe if there is data need write to raid disks | |
474af965 | 4722 | */ |
70d466f7 SL |
4723 | if (s.failed > conf->max_degraded || |
4724 | (s.log_failed && s.injournal == 0)) { | |
9a3f530f N |
4725 | sh->check_state = 0; |
4726 | sh->reconstruct_state = 0; | |
626f2092 | 4727 | break_stripe_batch_list(sh, 0); |
9a3f530f | 4728 | if (s.to_read+s.to_write+s.written) |
bd83d0a2 | 4729 | handle_failed_stripe(conf, sh, &s, disks); |
9a3e1101 | 4730 | if (s.syncing + s.replacing) |
9a3f530f N |
4731 | handle_failed_sync(conf, sh, &s); |
4732 | } | |
474af965 | 4733 | |
84789554 N |
4734 | /* Now we check to see if any write operations have recently |
4735 | * completed | |
4736 | */ | |
4737 | prexor = 0; | |
4738 | if (sh->reconstruct_state == reconstruct_state_prexor_drain_result) | |
4739 | prexor = 1; | |
4740 | if (sh->reconstruct_state == reconstruct_state_drain_result || | |
4741 | sh->reconstruct_state == reconstruct_state_prexor_drain_result) { | |
4742 | sh->reconstruct_state = reconstruct_state_idle; | |
4743 | ||
4744 | /* All the 'written' buffers and the parity block are ready to | |
4745 | * be written back to disk | |
4746 | */ | |
9e444768 SL |
4747 | BUG_ON(!test_bit(R5_UPTODATE, &sh->dev[sh->pd_idx].flags) && |
4748 | !test_bit(R5_Discard, &sh->dev[sh->pd_idx].flags)); | |
84789554 | 4749 | BUG_ON(sh->qd_idx >= 0 && |
9e444768 SL |
4750 | !test_bit(R5_UPTODATE, &sh->dev[sh->qd_idx].flags) && |
4751 | !test_bit(R5_Discard, &sh->dev[sh->qd_idx].flags)); | |
84789554 N |
4752 | for (i = disks; i--; ) { |
4753 | struct r5dev *dev = &sh->dev[i]; | |
4754 | if (test_bit(R5_LOCKED, &dev->flags) && | |
4755 | (i == sh->pd_idx || i == sh->qd_idx || | |
1e6d690b SL |
4756 | dev->written || test_bit(R5_InJournal, |
4757 | &dev->flags))) { | |
84789554 N |
4758 | pr_debug("Writing block %d\n", i); |
4759 | set_bit(R5_Wantwrite, &dev->flags); | |
4760 | if (prexor) | |
4761 | continue; | |
9c4bdf69 N |
4762 | if (s.failed > 1) |
4763 | continue; | |
84789554 N |
4764 | if (!test_bit(R5_Insync, &dev->flags) || |
4765 | ((i == sh->pd_idx || i == sh->qd_idx) && | |
4766 | s.failed == 0)) | |
4767 | set_bit(STRIPE_INSYNC, &sh->state); | |
4768 | } | |
4769 | } | |
4770 | if (test_and_clear_bit(STRIPE_PREREAD_ACTIVE, &sh->state)) | |
4771 | s.dec_preread_active = 1; | |
4772 | } | |
4773 | ||
ef5b7c69 N |
4774 | /* |
4775 | * might be able to return some write requests if the parity blocks | |
4776 | * are safe, or on a failed drive | |
4777 | */ | |
4778 | pdev = &sh->dev[sh->pd_idx]; | |
4779 | s.p_failed = (s.failed >= 1 && s.failed_num[0] == sh->pd_idx) | |
4780 | || (s.failed >= 2 && s.failed_num[1] == sh->pd_idx); | |
4781 | qdev = &sh->dev[sh->qd_idx]; | |
4782 | s.q_failed = (s.failed >= 1 && s.failed_num[0] == sh->qd_idx) | |
4783 | || (s.failed >= 2 && s.failed_num[1] == sh->qd_idx) | |
4784 | || conf->level < 6; | |
4785 | ||
4786 | if (s.written && | |
4787 | (s.p_failed || ((test_bit(R5_Insync, &pdev->flags) | |
4788 | && !test_bit(R5_LOCKED, &pdev->flags) | |
4789 | && (test_bit(R5_UPTODATE, &pdev->flags) || | |
4790 | test_bit(R5_Discard, &pdev->flags))))) && | |
4791 | (s.q_failed || ((test_bit(R5_Insync, &qdev->flags) | |
4792 | && !test_bit(R5_LOCKED, &qdev->flags) | |
4793 | && (test_bit(R5_UPTODATE, &qdev->flags) || | |
4794 | test_bit(R5_Discard, &qdev->flags)))))) | |
bd83d0a2 | 4795 | handle_stripe_clean_event(conf, sh, disks); |
ef5b7c69 | 4796 | |
1e6d690b | 4797 | if (s.just_cached) |
bd83d0a2 | 4798 | r5c_handle_cached_data_endio(conf, sh, disks); |
ff875738 | 4799 | log_stripe_write_finished(sh); |
1e6d690b | 4800 | |
ef5b7c69 N |
4801 | /* Now we might consider reading some blocks, either to check/generate |
4802 | * parity, or to satisfy requests | |
4803 | * or to load a block that is being partially written. | |
4804 | */ | |
4805 | if (s.to_read || s.non_overwrite | |
4806 | || (conf->level == 6 && s.to_write && s.failed) | |
4807 | || (s.syncing && (s.uptodate + s.compute < disks)) | |
4808 | || s.replacing | |
4809 | || s.expanding) | |
4810 | handle_stripe_fill(sh, &s, disks); | |
4811 | ||
2ded3703 SL |
4812 | /* |
4813 | * When the stripe finishes full journal write cycle (write to journal | |
4814 | * and raid disk), this is the clean up procedure so it is ready for | |
4815 | * next operation. | |
4816 | */ | |
4817 | r5c_finish_stripe_write_out(conf, sh, &s); | |
4818 | ||
4819 | /* | |
4820 | * Now to consider new write requests, cache write back and what else, | |
4821 | * if anything should be read. We do not handle new writes when: | |
84789554 N |
4822 | * 1/ A 'write' operation (copy+xor) is already in flight. |
4823 | * 2/ A 'check' operation is in flight, as it may clobber the parity | |
4824 | * block. | |
2ded3703 | 4825 | * 3/ A r5c cache log write is in flight. |
84789554 | 4826 | */ |
2ded3703 SL |
4827 | |
4828 | if (!sh->reconstruct_state && !sh->check_state && !sh->log_io) { | |
4829 | if (!r5c_is_writeback(conf->log)) { | |
4830 | if (s.to_write) | |
4831 | handle_stripe_dirtying(conf, sh, &s, disks); | |
4832 | } else { /* write back cache */ | |
4833 | int ret = 0; | |
4834 | ||
4835 | /* First, try handle writes in caching phase */ | |
4836 | if (s.to_write) | |
4837 | ret = r5c_try_caching_write(conf, sh, &s, | |
4838 | disks); | |
4839 | /* | |
4840 | * If caching phase failed: ret == -EAGAIN | |
4841 | * OR | |
4842 | * stripe under reclaim: !caching && injournal | |
4843 | * | |
4844 | * fall back to handle_stripe_dirtying() | |
4845 | */ | |
4846 | if (ret == -EAGAIN || | |
4847 | /* stripe under reclaim: !caching && injournal */ | |
4848 | (!test_bit(STRIPE_R5C_CACHING, &sh->state) && | |
d7bd398e SL |
4849 | s.injournal > 0)) { |
4850 | ret = handle_stripe_dirtying(conf, sh, &s, | |
4851 | disks); | |
4852 | if (ret == -EAGAIN) | |
4853 | goto finish; | |
4854 | } | |
2ded3703 SL |
4855 | } |
4856 | } | |
84789554 N |
4857 | |
4858 | /* maybe we need to check and possibly fix the parity for this stripe | |
4859 | * Any reads will already have been scheduled, so we just see if enough | |
4860 | * data is available. The parity check is held off while parity | |
4861 | * dependent operations are in flight. | |
4862 | */ | |
4863 | if (sh->check_state || | |
4864 | (s.syncing && s.locked == 0 && | |
4865 | !test_bit(STRIPE_COMPUTE_RUN, &sh->state) && | |
4866 | !test_bit(STRIPE_INSYNC, &sh->state))) { | |
4867 | if (conf->level == 6) | |
4868 | handle_parity_checks6(conf, sh, &s, disks); | |
4869 | else | |
4870 | handle_parity_checks5(conf, sh, &s, disks); | |
4871 | } | |
c5a31000 | 4872 | |
f94c0b66 N |
4873 | if ((s.replacing || s.syncing) && s.locked == 0 |
4874 | && !test_bit(STRIPE_COMPUTE_RUN, &sh->state) | |
4875 | && !test_bit(STRIPE_REPLACED, &sh->state)) { | |
9a3e1101 N |
4876 | /* Write out to replacement devices where possible */ |
4877 | for (i = 0; i < conf->raid_disks; i++) | |
f94c0b66 N |
4878 | if (test_bit(R5_NeedReplace, &sh->dev[i].flags)) { |
4879 | WARN_ON(!test_bit(R5_UPTODATE, &sh->dev[i].flags)); | |
9a3e1101 N |
4880 | set_bit(R5_WantReplace, &sh->dev[i].flags); |
4881 | set_bit(R5_LOCKED, &sh->dev[i].flags); | |
4882 | s.locked++; | |
4883 | } | |
f94c0b66 N |
4884 | if (s.replacing) |
4885 | set_bit(STRIPE_INSYNC, &sh->state); | |
4886 | set_bit(STRIPE_REPLACED, &sh->state); | |
9a3e1101 N |
4887 | } |
4888 | if ((s.syncing || s.replacing) && s.locked == 0 && | |
f94c0b66 | 4889 | !test_bit(STRIPE_COMPUTE_RUN, &sh->state) && |
9a3e1101 | 4890 | test_bit(STRIPE_INSYNC, &sh->state)) { |
c5a31000 N |
4891 | md_done_sync(conf->mddev, STRIPE_SECTORS, 1); |
4892 | clear_bit(STRIPE_SYNCING, &sh->state); | |
f8dfcffd N |
4893 | if (test_and_clear_bit(R5_Overlap, &sh->dev[sh->pd_idx].flags)) |
4894 | wake_up(&conf->wait_for_overlap); | |
c5a31000 N |
4895 | } |
4896 | ||
4897 | /* If the failed drives are just a ReadError, then we might need | |
4898 | * to progress the repair/check process | |
4899 | */ | |
4900 | if (s.failed <= conf->max_degraded && !conf->mddev->ro) | |
4901 | for (i = 0; i < s.failed; i++) { | |
4902 | struct r5dev *dev = &sh->dev[s.failed_num[i]]; | |
4903 | if (test_bit(R5_ReadError, &dev->flags) | |
4904 | && !test_bit(R5_LOCKED, &dev->flags) | |
4905 | && test_bit(R5_UPTODATE, &dev->flags) | |
4906 | ) { | |
4907 | if (!test_bit(R5_ReWrite, &dev->flags)) { | |
4908 | set_bit(R5_Wantwrite, &dev->flags); | |
4909 | set_bit(R5_ReWrite, &dev->flags); | |
4910 | set_bit(R5_LOCKED, &dev->flags); | |
4911 | s.locked++; | |
4912 | } else { | |
4913 | /* let's read it back */ | |
4914 | set_bit(R5_Wantread, &dev->flags); | |
4915 | set_bit(R5_LOCKED, &dev->flags); | |
4916 | s.locked++; | |
4917 | } | |
4918 | } | |
4919 | } | |
4920 | ||
3687c061 N |
4921 | /* Finish reconstruct operations initiated by the expansion process */ |
4922 | if (sh->reconstruct_state == reconstruct_state_result) { | |
4923 | struct stripe_head *sh_src | |
6d036f7d | 4924 | = raid5_get_active_stripe(conf, sh->sector, 1, 1, 1); |
3687c061 N |
4925 | if (sh_src && test_bit(STRIPE_EXPAND_SOURCE, &sh_src->state)) { |
4926 | /* sh cannot be written until sh_src has been read. | |
4927 | * so arrange for sh to be delayed a little | |
4928 | */ | |
4929 | set_bit(STRIPE_DELAYED, &sh->state); | |
4930 | set_bit(STRIPE_HANDLE, &sh->state); | |
4931 | if (!test_and_set_bit(STRIPE_PREREAD_ACTIVE, | |
4932 | &sh_src->state)) | |
4933 | atomic_inc(&conf->preread_active_stripes); | |
6d036f7d | 4934 | raid5_release_stripe(sh_src); |
3687c061 N |
4935 | goto finish; |
4936 | } | |
4937 | if (sh_src) | |
6d036f7d | 4938 | raid5_release_stripe(sh_src); |
3687c061 N |
4939 | |
4940 | sh->reconstruct_state = reconstruct_state_idle; | |
4941 | clear_bit(STRIPE_EXPANDING, &sh->state); | |
4942 | for (i = conf->raid_disks; i--; ) { | |
4943 | set_bit(R5_Wantwrite, &sh->dev[i].flags); | |
4944 | set_bit(R5_LOCKED, &sh->dev[i].flags); | |
4945 | s.locked++; | |
4946 | } | |
4947 | } | |
f416885e | 4948 | |
3687c061 N |
4949 | if (s.expanded && test_bit(STRIPE_EXPANDING, &sh->state) && |
4950 | !sh->reconstruct_state) { | |
4951 | /* Need to write out all blocks after computing parity */ | |
4952 | sh->disks = conf->raid_disks; | |
4953 | stripe_set_idx(sh->sector, conf, 0, sh); | |
4954 | schedule_reconstruction(sh, &s, 1, 1); | |
4955 | } else if (s.expanded && !sh->reconstruct_state && s.locked == 0) { | |
4956 | clear_bit(STRIPE_EXPAND_READY, &sh->state); | |
4957 | atomic_dec(&conf->reshape_stripes); | |
4958 | wake_up(&conf->wait_for_overlap); | |
4959 | md_done_sync(conf->mddev, STRIPE_SECTORS, 1); | |
4960 | } | |
4961 | ||
4962 | if (s.expanding && s.locked == 0 && | |
4963 | !test_bit(STRIPE_COMPUTE_RUN, &sh->state)) | |
4964 | handle_stripe_expansion(conf, sh); | |
16a53ecc | 4965 | |
3687c061 | 4966 | finish: |
6bfe0b49 | 4967 | /* wait for this device to become unblocked */ |
5f066c63 N |
4968 | if (unlikely(s.blocked_rdev)) { |
4969 | if (conf->mddev->external) | |
4970 | md_wait_for_blocked_rdev(s.blocked_rdev, | |
4971 | conf->mddev); | |
4972 | else | |
4973 | /* Internal metadata will immediately | |
4974 | * be written by raid5d, so we don't | |
4975 | * need to wait here. | |
4976 | */ | |
4977 | rdev_dec_pending(s.blocked_rdev, | |
4978 | conf->mddev); | |
4979 | } | |
6bfe0b49 | 4980 | |
bc2607f3 N |
4981 | if (s.handle_bad_blocks) |
4982 | for (i = disks; i--; ) { | |
3cb03002 | 4983 | struct md_rdev *rdev; |
bc2607f3 N |
4984 | struct r5dev *dev = &sh->dev[i]; |
4985 | if (test_and_clear_bit(R5_WriteError, &dev->flags)) { | |
4986 | /* We own a safe reference to the rdev */ | |
4987 | rdev = conf->disks[i].rdev; | |
4988 | if (!rdev_set_badblocks(rdev, sh->sector, | |
4989 | STRIPE_SECTORS, 0)) | |
4990 | md_error(conf->mddev, rdev); | |
4991 | rdev_dec_pending(rdev, conf->mddev); | |
4992 | } | |
b84db560 N |
4993 | if (test_and_clear_bit(R5_MadeGood, &dev->flags)) { |
4994 | rdev = conf->disks[i].rdev; | |
4995 | rdev_clear_badblocks(rdev, sh->sector, | |
c6563a8c | 4996 | STRIPE_SECTORS, 0); |
b84db560 N |
4997 | rdev_dec_pending(rdev, conf->mddev); |
4998 | } | |
977df362 N |
4999 | if (test_and_clear_bit(R5_MadeGoodRepl, &dev->flags)) { |
5000 | rdev = conf->disks[i].replacement; | |
dd054fce N |
5001 | if (!rdev) |
5002 | /* rdev have been moved down */ | |
5003 | rdev = conf->disks[i].rdev; | |
977df362 | 5004 | rdev_clear_badblocks(rdev, sh->sector, |
c6563a8c | 5005 | STRIPE_SECTORS, 0); |
977df362 N |
5006 | rdev_dec_pending(rdev, conf->mddev); |
5007 | } | |
bc2607f3 N |
5008 | } |
5009 | ||
6c0069c0 YT |
5010 | if (s.ops_request) |
5011 | raid_run_ops(sh, s.ops_request); | |
5012 | ||
f0e43bcd | 5013 | ops_run_io(sh, &s); |
16a53ecc | 5014 | |
c5709ef6 | 5015 | if (s.dec_preread_active) { |
729a1866 | 5016 | /* We delay this until after ops_run_io so that if make_request |
e9c7469b | 5017 | * is waiting on a flush, it won't continue until the writes |
729a1866 N |
5018 | * have actually been submitted. |
5019 | */ | |
5020 | atomic_dec(&conf->preread_active_stripes); | |
5021 | if (atomic_read(&conf->preread_active_stripes) < | |
5022 | IO_THRESHOLD) | |
5023 | md_wakeup_thread(conf->mddev->thread); | |
5024 | } | |
5025 | ||
257a4b42 | 5026 | clear_bit_unlock(STRIPE_ACTIVE, &sh->state); |
16a53ecc N |
5027 | } |
5028 | ||
d1688a6d | 5029 | static void raid5_activate_delayed(struct r5conf *conf) |
16a53ecc N |
5030 | { |
5031 | if (atomic_read(&conf->preread_active_stripes) < IO_THRESHOLD) { | |
5032 | while (!list_empty(&conf->delayed_list)) { | |
5033 | struct list_head *l = conf->delayed_list.next; | |
5034 | struct stripe_head *sh; | |
5035 | sh = list_entry(l, struct stripe_head, lru); | |
5036 | list_del_init(l); | |
5037 | clear_bit(STRIPE_DELAYED, &sh->state); | |
5038 | if (!test_and_set_bit(STRIPE_PREREAD_ACTIVE, &sh->state)) | |
5039 | atomic_inc(&conf->preread_active_stripes); | |
8b3e6cdc | 5040 | list_add_tail(&sh->lru, &conf->hold_list); |
851c30c9 | 5041 | raid5_wakeup_stripe_thread(sh); |
16a53ecc | 5042 | } |
482c0834 | 5043 | } |
16a53ecc N |
5044 | } |
5045 | ||
566c09c5 SL |
5046 | static void activate_bit_delay(struct r5conf *conf, |
5047 | struct list_head *temp_inactive_list) | |
16a53ecc N |
5048 | { |
5049 | /* device_lock is held */ | |
5050 | struct list_head head; | |
5051 | list_add(&head, &conf->bitmap_list); | |
5052 | list_del_init(&conf->bitmap_list); | |
5053 | while (!list_empty(&head)) { | |
5054 | struct stripe_head *sh = list_entry(head.next, struct stripe_head, lru); | |
566c09c5 | 5055 | int hash; |
16a53ecc N |
5056 | list_del_init(&sh->lru); |
5057 | atomic_inc(&sh->count); | |
566c09c5 SL |
5058 | hash = sh->hash_lock_index; |
5059 | __release_stripe(conf, sh, &temp_inactive_list[hash]); | |
16a53ecc N |
5060 | } |
5061 | } | |
5062 | ||
5c675f83 | 5063 | static int raid5_congested(struct mddev *mddev, int bits) |
f022b2fd | 5064 | { |
d1688a6d | 5065 | struct r5conf *conf = mddev->private; |
f022b2fd N |
5066 | |
5067 | /* No difference between reads and writes. Just check | |
5068 | * how busy the stripe_cache is | |
5069 | */ | |
3fa841d7 | 5070 | |
5423399a | 5071 | if (test_bit(R5_INACTIVE_BLOCKED, &conf->cache_state)) |
f022b2fd | 5072 | return 1; |
a39f7afd SL |
5073 | |
5074 | /* Also checks whether there is pressure on r5cache log space */ | |
5075 | if (test_bit(R5C_LOG_TIGHT, &conf->cache_state)) | |
5076 | return 1; | |
f022b2fd N |
5077 | if (conf->quiesce) |
5078 | return 1; | |
4bda556a | 5079 | if (atomic_read(&conf->empty_inactive_list_nr)) |
f022b2fd N |
5080 | return 1; |
5081 | ||
5082 | return 0; | |
5083 | } | |
5084 | ||
fd01b88c | 5085 | static int in_chunk_boundary(struct mddev *mddev, struct bio *bio) |
f679623f | 5086 | { |
3cb5edf4 | 5087 | struct r5conf *conf = mddev->private; |
4f024f37 | 5088 | sector_t sector = bio->bi_iter.bi_sector + get_start_sect(bio->bi_bdev); |
3cb5edf4 | 5089 | unsigned int chunk_sectors; |
aa8b57aa | 5090 | unsigned int bio_sectors = bio_sectors(bio); |
f679623f | 5091 | |
3cb5edf4 | 5092 | chunk_sectors = min(conf->chunk_sectors, conf->prev_chunk_sectors); |
f679623f RBJ |
5093 | return chunk_sectors >= |
5094 | ((sector & (chunk_sectors - 1)) + bio_sectors); | |
5095 | } | |
5096 | ||
46031f9a RBJ |
5097 | /* |
5098 | * add bio to the retry LIFO ( in O(1) ... we are in interrupt ) | |
5099 | * later sampled by raid5d. | |
5100 | */ | |
d1688a6d | 5101 | static void add_bio_to_retry(struct bio *bi,struct r5conf *conf) |
46031f9a RBJ |
5102 | { |
5103 | unsigned long flags; | |
5104 | ||
5105 | spin_lock_irqsave(&conf->device_lock, flags); | |
5106 | ||
5107 | bi->bi_next = conf->retry_read_aligned_list; | |
5108 | conf->retry_read_aligned_list = bi; | |
5109 | ||
5110 | spin_unlock_irqrestore(&conf->device_lock, flags); | |
5111 | md_wakeup_thread(conf->mddev->thread); | |
5112 | } | |
5113 | ||
0472a42b N |
5114 | static struct bio *remove_bio_from_retry(struct r5conf *conf, |
5115 | unsigned int *offset) | |
46031f9a RBJ |
5116 | { |
5117 | struct bio *bi; | |
5118 | ||
5119 | bi = conf->retry_read_aligned; | |
5120 | if (bi) { | |
0472a42b | 5121 | *offset = conf->retry_read_offset; |
46031f9a RBJ |
5122 | conf->retry_read_aligned = NULL; |
5123 | return bi; | |
5124 | } | |
5125 | bi = conf->retry_read_aligned_list; | |
5126 | if(bi) { | |
387bb173 | 5127 | conf->retry_read_aligned_list = bi->bi_next; |
46031f9a | 5128 | bi->bi_next = NULL; |
0472a42b | 5129 | *offset = 0; |
46031f9a RBJ |
5130 | } |
5131 | ||
5132 | return bi; | |
5133 | } | |
5134 | ||
f679623f RBJ |
5135 | /* |
5136 | * The "raid5_align_endio" should check if the read succeeded and if it | |
5137 | * did, call bio_endio on the original bio (having bio_put the new bio | |
5138 | * first). | |
5139 | * If the read failed.. | |
5140 | */ | |
4246a0b6 | 5141 | static void raid5_align_endio(struct bio *bi) |
f679623f RBJ |
5142 | { |
5143 | struct bio* raid_bi = bi->bi_private; | |
fd01b88c | 5144 | struct mddev *mddev; |
d1688a6d | 5145 | struct r5conf *conf; |
3cb03002 | 5146 | struct md_rdev *rdev; |
9b81c842 | 5147 | int error = bi->bi_error; |
46031f9a | 5148 | |
f679623f | 5149 | bio_put(bi); |
46031f9a | 5150 | |
46031f9a RBJ |
5151 | rdev = (void*)raid_bi->bi_next; |
5152 | raid_bi->bi_next = NULL; | |
2b7f2228 N |
5153 | mddev = rdev->mddev; |
5154 | conf = mddev->private; | |
46031f9a RBJ |
5155 | |
5156 | rdev_dec_pending(rdev, conf->mddev); | |
5157 | ||
9b81c842 | 5158 | if (!error) { |
4246a0b6 | 5159 | bio_endio(raid_bi); |
46031f9a | 5160 | if (atomic_dec_and_test(&conf->active_aligned_reads)) |
b1b46486 | 5161 | wake_up(&conf->wait_for_quiescent); |
6712ecf8 | 5162 | return; |
46031f9a RBJ |
5163 | } |
5164 | ||
45b4233c | 5165 | pr_debug("raid5_align_endio : io error...handing IO for a retry\n"); |
46031f9a RBJ |
5166 | |
5167 | add_bio_to_retry(raid_bi, conf); | |
f679623f RBJ |
5168 | } |
5169 | ||
7ef6b12a | 5170 | static int raid5_read_one_chunk(struct mddev *mddev, struct bio *raid_bio) |
f679623f | 5171 | { |
d1688a6d | 5172 | struct r5conf *conf = mddev->private; |
8553fe7e | 5173 | int dd_idx; |
f679623f | 5174 | struct bio* align_bi; |
3cb03002 | 5175 | struct md_rdev *rdev; |
671488cc | 5176 | sector_t end_sector; |
f679623f RBJ |
5177 | |
5178 | if (!in_chunk_boundary(mddev, raid_bio)) { | |
7ef6b12a | 5179 | pr_debug("%s: non aligned\n", __func__); |
f679623f RBJ |
5180 | return 0; |
5181 | } | |
5182 | /* | |
d7a10308 | 5183 | * use bio_clone_fast to make a copy of the bio |
f679623f | 5184 | */ |
d7a10308 | 5185 | align_bi = bio_clone_fast(raid_bio, GFP_NOIO, mddev->bio_set); |
f679623f RBJ |
5186 | if (!align_bi) |
5187 | return 0; | |
5188 | /* | |
5189 | * set bi_end_io to a new function, and set bi_private to the | |
5190 | * original bio. | |
5191 | */ | |
5192 | align_bi->bi_end_io = raid5_align_endio; | |
5193 | align_bi->bi_private = raid_bio; | |
5194 | /* | |
5195 | * compute position | |
5196 | */ | |
4f024f37 KO |
5197 | align_bi->bi_iter.bi_sector = |
5198 | raid5_compute_sector(conf, raid_bio->bi_iter.bi_sector, | |
5199 | 0, &dd_idx, NULL); | |
f679623f | 5200 | |
f73a1c7d | 5201 | end_sector = bio_end_sector(align_bi); |
f679623f | 5202 | rcu_read_lock(); |
671488cc N |
5203 | rdev = rcu_dereference(conf->disks[dd_idx].replacement); |
5204 | if (!rdev || test_bit(Faulty, &rdev->flags) || | |
5205 | rdev->recovery_offset < end_sector) { | |
5206 | rdev = rcu_dereference(conf->disks[dd_idx].rdev); | |
5207 | if (rdev && | |
5208 | (test_bit(Faulty, &rdev->flags) || | |
5209 | !(test_bit(In_sync, &rdev->flags) || | |
5210 | rdev->recovery_offset >= end_sector))) | |
5211 | rdev = NULL; | |
5212 | } | |
03b047f4 SL |
5213 | |
5214 | if (r5c_big_stripe_cached(conf, align_bi->bi_iter.bi_sector)) { | |
5215 | rcu_read_unlock(); | |
5216 | bio_put(align_bi); | |
5217 | return 0; | |
5218 | } | |
5219 | ||
671488cc | 5220 | if (rdev) { |
31c176ec N |
5221 | sector_t first_bad; |
5222 | int bad_sectors; | |
5223 | ||
f679623f RBJ |
5224 | atomic_inc(&rdev->nr_pending); |
5225 | rcu_read_unlock(); | |
46031f9a RBJ |
5226 | raid_bio->bi_next = (void*)rdev; |
5227 | align_bi->bi_bdev = rdev->bdev; | |
b7c44ed9 | 5228 | bio_clear_flag(align_bi, BIO_SEG_VALID); |
46031f9a | 5229 | |
7140aafc | 5230 | if (is_badblock(rdev, align_bi->bi_iter.bi_sector, |
4f024f37 | 5231 | bio_sectors(align_bi), |
31c176ec | 5232 | &first_bad, &bad_sectors)) { |
387bb173 NB |
5233 | bio_put(align_bi); |
5234 | rdev_dec_pending(rdev, mddev); | |
5235 | return 0; | |
5236 | } | |
5237 | ||
6c0544e2 | 5238 | /* No reshape active, so we can trust rdev->data_offset */ |
4f024f37 | 5239 | align_bi->bi_iter.bi_sector += rdev->data_offset; |
6c0544e2 | 5240 | |
46031f9a | 5241 | spin_lock_irq(&conf->device_lock); |
b1b46486 | 5242 | wait_event_lock_irq(conf->wait_for_quiescent, |
46031f9a | 5243 | conf->quiesce == 0, |
eed8c02e | 5244 | conf->device_lock); |
46031f9a RBJ |
5245 | atomic_inc(&conf->active_aligned_reads); |
5246 | spin_unlock_irq(&conf->device_lock); | |
5247 | ||
e3620a3a JB |
5248 | if (mddev->gendisk) |
5249 | trace_block_bio_remap(bdev_get_queue(align_bi->bi_bdev), | |
5250 | align_bi, disk_devt(mddev->gendisk), | |
4f024f37 | 5251 | raid_bio->bi_iter.bi_sector); |
f679623f RBJ |
5252 | generic_make_request(align_bi); |
5253 | return 1; | |
5254 | } else { | |
5255 | rcu_read_unlock(); | |
46031f9a | 5256 | bio_put(align_bi); |
f679623f RBJ |
5257 | return 0; |
5258 | } | |
5259 | } | |
5260 | ||
7ef6b12a ML |
5261 | static struct bio *chunk_aligned_read(struct mddev *mddev, struct bio *raid_bio) |
5262 | { | |
5263 | struct bio *split; | |
dd7a8f5d N |
5264 | sector_t sector = raid_bio->bi_iter.bi_sector; |
5265 | unsigned chunk_sects = mddev->chunk_sectors; | |
5266 | unsigned sectors = chunk_sects - (sector & (chunk_sects-1)); | |
7ef6b12a | 5267 | |
dd7a8f5d N |
5268 | if (sectors < bio_sectors(raid_bio)) { |
5269 | struct r5conf *conf = mddev->private; | |
5270 | split = bio_split(raid_bio, sectors, GFP_NOIO, conf->bio_split); | |
5271 | bio_chain(split, raid_bio); | |
5272 | generic_make_request(raid_bio); | |
5273 | raid_bio = split; | |
5274 | } | |
7ef6b12a | 5275 | |
dd7a8f5d N |
5276 | if (!raid5_read_one_chunk(mddev, raid_bio)) |
5277 | return raid_bio; | |
7ef6b12a ML |
5278 | |
5279 | return NULL; | |
5280 | } | |
5281 | ||
8b3e6cdc DW |
5282 | /* __get_priority_stripe - get the next stripe to process |
5283 | * | |
5284 | * Full stripe writes are allowed to pass preread active stripes up until | |
5285 | * the bypass_threshold is exceeded. In general the bypass_count | |
5286 | * increments when the handle_list is handled before the hold_list; however, it | |
5287 | * will not be incremented when STRIPE_IO_STARTED is sampled set signifying a | |
5288 | * stripe with in flight i/o. The bypass_count will be reset when the | |
5289 | * head of the hold_list has changed, i.e. the head was promoted to the | |
5290 | * handle_list. | |
5291 | */ | |
851c30c9 | 5292 | static struct stripe_head *__get_priority_stripe(struct r5conf *conf, int group) |
8b3e6cdc | 5293 | { |
535ae4eb | 5294 | struct stripe_head *sh, *tmp; |
851c30c9 | 5295 | struct list_head *handle_list = NULL; |
535ae4eb | 5296 | struct r5worker_group *wg; |
70d466f7 SL |
5297 | bool second_try = !r5c_is_writeback(conf->log) && |
5298 | !r5l_log_disk_error(conf); | |
5299 | bool try_loprio = test_bit(R5C_LOG_TIGHT, &conf->cache_state) || | |
5300 | r5l_log_disk_error(conf); | |
851c30c9 | 5301 | |
535ae4eb SL |
5302 | again: |
5303 | wg = NULL; | |
5304 | sh = NULL; | |
851c30c9 | 5305 | if (conf->worker_cnt_per_group == 0) { |
535ae4eb SL |
5306 | handle_list = try_loprio ? &conf->loprio_list : |
5307 | &conf->handle_list; | |
851c30c9 | 5308 | } else if (group != ANY_GROUP) { |
535ae4eb SL |
5309 | handle_list = try_loprio ? &conf->worker_groups[group].loprio_list : |
5310 | &conf->worker_groups[group].handle_list; | |
bfc90cb0 | 5311 | wg = &conf->worker_groups[group]; |
851c30c9 SL |
5312 | } else { |
5313 | int i; | |
5314 | for (i = 0; i < conf->group_cnt; i++) { | |
535ae4eb SL |
5315 | handle_list = try_loprio ? &conf->worker_groups[i].loprio_list : |
5316 | &conf->worker_groups[i].handle_list; | |
bfc90cb0 | 5317 | wg = &conf->worker_groups[i]; |
851c30c9 SL |
5318 | if (!list_empty(handle_list)) |
5319 | break; | |
5320 | } | |
5321 | } | |
8b3e6cdc DW |
5322 | |
5323 | pr_debug("%s: handle: %s hold: %s full_writes: %d bypass_count: %d\n", | |
5324 | __func__, | |
851c30c9 | 5325 | list_empty(handle_list) ? "empty" : "busy", |
8b3e6cdc DW |
5326 | list_empty(&conf->hold_list) ? "empty" : "busy", |
5327 | atomic_read(&conf->pending_full_writes), conf->bypass_count); | |
5328 | ||
851c30c9 SL |
5329 | if (!list_empty(handle_list)) { |
5330 | sh = list_entry(handle_list->next, typeof(*sh), lru); | |
8b3e6cdc DW |
5331 | |
5332 | if (list_empty(&conf->hold_list)) | |
5333 | conf->bypass_count = 0; | |
5334 | else if (!test_bit(STRIPE_IO_STARTED, &sh->state)) { | |
5335 | if (conf->hold_list.next == conf->last_hold) | |
5336 | conf->bypass_count++; | |
5337 | else { | |
5338 | conf->last_hold = conf->hold_list.next; | |
5339 | conf->bypass_count -= conf->bypass_threshold; | |
5340 | if (conf->bypass_count < 0) | |
5341 | conf->bypass_count = 0; | |
5342 | } | |
5343 | } | |
5344 | } else if (!list_empty(&conf->hold_list) && | |
5345 | ((conf->bypass_threshold && | |
5346 | conf->bypass_count > conf->bypass_threshold) || | |
5347 | atomic_read(&conf->pending_full_writes) == 0)) { | |
851c30c9 SL |
5348 | |
5349 | list_for_each_entry(tmp, &conf->hold_list, lru) { | |
5350 | if (conf->worker_cnt_per_group == 0 || | |
5351 | group == ANY_GROUP || | |
5352 | !cpu_online(tmp->cpu) || | |
5353 | cpu_to_group(tmp->cpu) == group) { | |
5354 | sh = tmp; | |
5355 | break; | |
5356 | } | |
5357 | } | |
5358 | ||
5359 | if (sh) { | |
5360 | conf->bypass_count -= conf->bypass_threshold; | |
5361 | if (conf->bypass_count < 0) | |
5362 | conf->bypass_count = 0; | |
5363 | } | |
bfc90cb0 | 5364 | wg = NULL; |
851c30c9 SL |
5365 | } |
5366 | ||
535ae4eb SL |
5367 | if (!sh) { |
5368 | if (second_try) | |
5369 | return NULL; | |
5370 | second_try = true; | |
5371 | try_loprio = !try_loprio; | |
5372 | goto again; | |
5373 | } | |
8b3e6cdc | 5374 | |
bfc90cb0 SL |
5375 | if (wg) { |
5376 | wg->stripes_cnt--; | |
5377 | sh->group = NULL; | |
5378 | } | |
8b3e6cdc | 5379 | list_del_init(&sh->lru); |
c7a6d35e | 5380 | BUG_ON(atomic_inc_return(&sh->count) != 1); |
8b3e6cdc DW |
5381 | return sh; |
5382 | } | |
f679623f | 5383 | |
8811b596 SL |
5384 | struct raid5_plug_cb { |
5385 | struct blk_plug_cb cb; | |
5386 | struct list_head list; | |
566c09c5 | 5387 | struct list_head temp_inactive_list[NR_STRIPE_HASH_LOCKS]; |
8811b596 SL |
5388 | }; |
5389 | ||
5390 | static void raid5_unplug(struct blk_plug_cb *blk_cb, bool from_schedule) | |
5391 | { | |
5392 | struct raid5_plug_cb *cb = container_of( | |
5393 | blk_cb, struct raid5_plug_cb, cb); | |
5394 | struct stripe_head *sh; | |
5395 | struct mddev *mddev = cb->cb.data; | |
5396 | struct r5conf *conf = mddev->private; | |
a9add5d9 | 5397 | int cnt = 0; |
566c09c5 | 5398 | int hash; |
8811b596 SL |
5399 | |
5400 | if (cb->list.next && !list_empty(&cb->list)) { | |
5401 | spin_lock_irq(&conf->device_lock); | |
5402 | while (!list_empty(&cb->list)) { | |
5403 | sh = list_first_entry(&cb->list, struct stripe_head, lru); | |
5404 | list_del_init(&sh->lru); | |
5405 | /* | |
5406 | * avoid race release_stripe_plug() sees | |
5407 | * STRIPE_ON_UNPLUG_LIST clear but the stripe | |
5408 | * is still in our list | |
5409 | */ | |
4e857c58 | 5410 | smp_mb__before_atomic(); |
8811b596 | 5411 | clear_bit(STRIPE_ON_UNPLUG_LIST, &sh->state); |
773ca82f SL |
5412 | /* |
5413 | * STRIPE_ON_RELEASE_LIST could be set here. In that | |
5414 | * case, the count is always > 1 here | |
5415 | */ | |
566c09c5 SL |
5416 | hash = sh->hash_lock_index; |
5417 | __release_stripe(conf, sh, &cb->temp_inactive_list[hash]); | |
a9add5d9 | 5418 | cnt++; |
8811b596 SL |
5419 | } |
5420 | spin_unlock_irq(&conf->device_lock); | |
5421 | } | |
566c09c5 SL |
5422 | release_inactive_stripe_list(conf, cb->temp_inactive_list, |
5423 | NR_STRIPE_HASH_LOCKS); | |
e3620a3a JB |
5424 | if (mddev->queue) |
5425 | trace_block_unplug(mddev->queue, cnt, !from_schedule); | |
8811b596 SL |
5426 | kfree(cb); |
5427 | } | |
5428 | ||
5429 | static void release_stripe_plug(struct mddev *mddev, | |
5430 | struct stripe_head *sh) | |
5431 | { | |
5432 | struct blk_plug_cb *blk_cb = blk_check_plugged( | |
5433 | raid5_unplug, mddev, | |
5434 | sizeof(struct raid5_plug_cb)); | |
5435 | struct raid5_plug_cb *cb; | |
5436 | ||
5437 | if (!blk_cb) { | |
6d036f7d | 5438 | raid5_release_stripe(sh); |
8811b596 SL |
5439 | return; |
5440 | } | |
5441 | ||
5442 | cb = container_of(blk_cb, struct raid5_plug_cb, cb); | |
5443 | ||
566c09c5 SL |
5444 | if (cb->list.next == NULL) { |
5445 | int i; | |
8811b596 | 5446 | INIT_LIST_HEAD(&cb->list); |
566c09c5 SL |
5447 | for (i = 0; i < NR_STRIPE_HASH_LOCKS; i++) |
5448 | INIT_LIST_HEAD(cb->temp_inactive_list + i); | |
5449 | } | |
8811b596 SL |
5450 | |
5451 | if (!test_and_set_bit(STRIPE_ON_UNPLUG_LIST, &sh->state)) | |
5452 | list_add_tail(&sh->lru, &cb->list); | |
5453 | else | |
6d036f7d | 5454 | raid5_release_stripe(sh); |
8811b596 SL |
5455 | } |
5456 | ||
620125f2 SL |
5457 | static void make_discard_request(struct mddev *mddev, struct bio *bi) |
5458 | { | |
5459 | struct r5conf *conf = mddev->private; | |
5460 | sector_t logical_sector, last_sector; | |
5461 | struct stripe_head *sh; | |
620125f2 SL |
5462 | int stripe_sectors; |
5463 | ||
5464 | if (mddev->reshape_position != MaxSector) | |
5465 | /* Skip discard while reshape is happening */ | |
5466 | return; | |
5467 | ||
4f024f37 KO |
5468 | logical_sector = bi->bi_iter.bi_sector & ~((sector_t)STRIPE_SECTORS-1); |
5469 | last_sector = bi->bi_iter.bi_sector + (bi->bi_iter.bi_size>>9); | |
620125f2 SL |
5470 | |
5471 | bi->bi_next = NULL; | |
49728050 | 5472 | md_write_start(mddev, bi); |
620125f2 SL |
5473 | |
5474 | stripe_sectors = conf->chunk_sectors * | |
5475 | (conf->raid_disks - conf->max_degraded); | |
5476 | logical_sector = DIV_ROUND_UP_SECTOR_T(logical_sector, | |
5477 | stripe_sectors); | |
5478 | sector_div(last_sector, stripe_sectors); | |
5479 | ||
5480 | logical_sector *= conf->chunk_sectors; | |
5481 | last_sector *= conf->chunk_sectors; | |
5482 | ||
5483 | for (; logical_sector < last_sector; | |
5484 | logical_sector += STRIPE_SECTORS) { | |
5485 | DEFINE_WAIT(w); | |
5486 | int d; | |
5487 | again: | |
6d036f7d | 5488 | sh = raid5_get_active_stripe(conf, logical_sector, 0, 0, 0); |
620125f2 SL |
5489 | prepare_to_wait(&conf->wait_for_overlap, &w, |
5490 | TASK_UNINTERRUPTIBLE); | |
f8dfcffd N |
5491 | set_bit(R5_Overlap, &sh->dev[sh->pd_idx].flags); |
5492 | if (test_bit(STRIPE_SYNCING, &sh->state)) { | |
6d036f7d | 5493 | raid5_release_stripe(sh); |
f8dfcffd N |
5494 | schedule(); |
5495 | goto again; | |
5496 | } | |
5497 | clear_bit(R5_Overlap, &sh->dev[sh->pd_idx].flags); | |
620125f2 SL |
5498 | spin_lock_irq(&sh->stripe_lock); |
5499 | for (d = 0; d < conf->raid_disks; d++) { | |
5500 | if (d == sh->pd_idx || d == sh->qd_idx) | |
5501 | continue; | |
5502 | if (sh->dev[d].towrite || sh->dev[d].toread) { | |
5503 | set_bit(R5_Overlap, &sh->dev[d].flags); | |
5504 | spin_unlock_irq(&sh->stripe_lock); | |
6d036f7d | 5505 | raid5_release_stripe(sh); |
620125f2 SL |
5506 | schedule(); |
5507 | goto again; | |
5508 | } | |
5509 | } | |
f8dfcffd | 5510 | set_bit(STRIPE_DISCARD, &sh->state); |
620125f2 | 5511 | finish_wait(&conf->wait_for_overlap, &w); |
7a87f434 | 5512 | sh->overwrite_disks = 0; |
620125f2 SL |
5513 | for (d = 0; d < conf->raid_disks; d++) { |
5514 | if (d == sh->pd_idx || d == sh->qd_idx) | |
5515 | continue; | |
5516 | sh->dev[d].towrite = bi; | |
5517 | set_bit(R5_OVERWRITE, &sh->dev[d].flags); | |
016c76ac | 5518 | bio_inc_remaining(bi); |
49728050 | 5519 | md_write_inc(mddev, bi); |
7a87f434 | 5520 | sh->overwrite_disks++; |
620125f2 SL |
5521 | } |
5522 | spin_unlock_irq(&sh->stripe_lock); | |
5523 | if (conf->mddev->bitmap) { | |
5524 | for (d = 0; | |
5525 | d < conf->raid_disks - conf->max_degraded; | |
5526 | d++) | |
5527 | bitmap_startwrite(mddev->bitmap, | |
5528 | sh->sector, | |
5529 | STRIPE_SECTORS, | |
5530 | 0); | |
5531 | sh->bm_seq = conf->seq_flush + 1; | |
5532 | set_bit(STRIPE_BIT_DELAY, &sh->state); | |
5533 | } | |
5534 | ||
5535 | set_bit(STRIPE_HANDLE, &sh->state); | |
5536 | clear_bit(STRIPE_DELAYED, &sh->state); | |
5537 | if (!test_and_set_bit(STRIPE_PREREAD_ACTIVE, &sh->state)) | |
5538 | atomic_inc(&conf->preread_active_stripes); | |
5539 | release_stripe_plug(mddev, sh); | |
5540 | } | |
5541 | ||
49728050 | 5542 | md_write_end(mddev); |
016c76ac | 5543 | bio_endio(bi); |
620125f2 SL |
5544 | } |
5545 | ||
849674e4 | 5546 | static void raid5_make_request(struct mddev *mddev, struct bio * bi) |
1da177e4 | 5547 | { |
d1688a6d | 5548 | struct r5conf *conf = mddev->private; |
911d4ee8 | 5549 | int dd_idx; |
1da177e4 LT |
5550 | sector_t new_sector; |
5551 | sector_t logical_sector, last_sector; | |
5552 | struct stripe_head *sh; | |
a362357b | 5553 | const int rw = bio_data_dir(bi); |
27c0f68f SL |
5554 | DEFINE_WAIT(w); |
5555 | bool do_prepare; | |
3bddb7f8 | 5556 | bool do_flush = false; |
1da177e4 | 5557 | |
1eff9d32 | 5558 | if (unlikely(bi->bi_opf & REQ_PREFLUSH)) { |
828cbe98 SL |
5559 | int ret = r5l_handle_flush_request(conf->log, bi); |
5560 | ||
5561 | if (ret == 0) | |
5562 | return; | |
5563 | if (ret == -ENODEV) { | |
5564 | md_flush_request(mddev, bi); | |
5565 | return; | |
5566 | } | |
5567 | /* ret == -EAGAIN, fallback */ | |
3bddb7f8 SL |
5568 | /* |
5569 | * if r5l_handle_flush_request() didn't clear REQ_PREFLUSH, | |
5570 | * we need to flush journal device | |
5571 | */ | |
5572 | do_flush = bi->bi_opf & REQ_PREFLUSH; | |
e5dcdd80 N |
5573 | } |
5574 | ||
9ffc8f7c EM |
5575 | /* |
5576 | * If array is degraded, better not do chunk aligned read because | |
5577 | * later we might have to read it again in order to reconstruct | |
5578 | * data on failed drives. | |
5579 | */ | |
5580 | if (rw == READ && mddev->degraded == 0 && | |
7ef6b12a ML |
5581 | mddev->reshape_position == MaxSector) { |
5582 | bi = chunk_aligned_read(mddev, bi); | |
5583 | if (!bi) | |
5584 | return; | |
5585 | } | |
52488615 | 5586 | |
796a5cf0 | 5587 | if (unlikely(bio_op(bi) == REQ_OP_DISCARD)) { |
620125f2 SL |
5588 | make_discard_request(mddev, bi); |
5589 | return; | |
5590 | } | |
5591 | ||
4f024f37 | 5592 | logical_sector = bi->bi_iter.bi_sector & ~((sector_t)STRIPE_SECTORS-1); |
f73a1c7d | 5593 | last_sector = bio_end_sector(bi); |
1da177e4 | 5594 | bi->bi_next = NULL; |
49728050 | 5595 | md_write_start(mddev, bi); |
06d91a5f | 5596 | |
27c0f68f | 5597 | prepare_to_wait(&conf->wait_for_overlap, &w, TASK_UNINTERRUPTIBLE); |
1da177e4 | 5598 | for (;logical_sector < last_sector; logical_sector += STRIPE_SECTORS) { |
b5663ba4 | 5599 | int previous; |
c46501b2 | 5600 | int seq; |
b578d55f | 5601 | |
27c0f68f | 5602 | do_prepare = false; |
7ecaa1e6 | 5603 | retry: |
c46501b2 | 5604 | seq = read_seqcount_begin(&conf->gen_lock); |
b5663ba4 | 5605 | previous = 0; |
27c0f68f SL |
5606 | if (do_prepare) |
5607 | prepare_to_wait(&conf->wait_for_overlap, &w, | |
5608 | TASK_UNINTERRUPTIBLE); | |
b0f9ec04 | 5609 | if (unlikely(conf->reshape_progress != MaxSector)) { |
fef9c61f | 5610 | /* spinlock is needed as reshape_progress may be |
df8e7f76 N |
5611 | * 64bit on a 32bit platform, and so it might be |
5612 | * possible to see a half-updated value | |
aeb878b0 | 5613 | * Of course reshape_progress could change after |
df8e7f76 N |
5614 | * the lock is dropped, so once we get a reference |
5615 | * to the stripe that we think it is, we will have | |
5616 | * to check again. | |
5617 | */ | |
7ecaa1e6 | 5618 | spin_lock_irq(&conf->device_lock); |
2c810cdd | 5619 | if (mddev->reshape_backwards |
fef9c61f N |
5620 | ? logical_sector < conf->reshape_progress |
5621 | : logical_sector >= conf->reshape_progress) { | |
b5663ba4 N |
5622 | previous = 1; |
5623 | } else { | |
2c810cdd | 5624 | if (mddev->reshape_backwards |
fef9c61f N |
5625 | ? logical_sector < conf->reshape_safe |
5626 | : logical_sector >= conf->reshape_safe) { | |
b578d55f N |
5627 | spin_unlock_irq(&conf->device_lock); |
5628 | schedule(); | |
27c0f68f | 5629 | do_prepare = true; |
b578d55f N |
5630 | goto retry; |
5631 | } | |
5632 | } | |
7ecaa1e6 N |
5633 | spin_unlock_irq(&conf->device_lock); |
5634 | } | |
16a53ecc | 5635 | |
112bf897 N |
5636 | new_sector = raid5_compute_sector(conf, logical_sector, |
5637 | previous, | |
911d4ee8 | 5638 | &dd_idx, NULL); |
849674e4 | 5639 | pr_debug("raid456: raid5_make_request, sector %llu logical %llu\n", |
c46501b2 | 5640 | (unsigned long long)new_sector, |
1da177e4 LT |
5641 | (unsigned long long)logical_sector); |
5642 | ||
6d036f7d | 5643 | sh = raid5_get_active_stripe(conf, new_sector, previous, |
1eff9d32 | 5644 | (bi->bi_opf & REQ_RAHEAD), 0); |
1da177e4 | 5645 | if (sh) { |
b0f9ec04 | 5646 | if (unlikely(previous)) { |
7ecaa1e6 | 5647 | /* expansion might have moved on while waiting for a |
df8e7f76 N |
5648 | * stripe, so we must do the range check again. |
5649 | * Expansion could still move past after this | |
5650 | * test, but as we are holding a reference to | |
5651 | * 'sh', we know that if that happens, | |
5652 | * STRIPE_EXPANDING will get set and the expansion | |
5653 | * won't proceed until we finish with the stripe. | |
7ecaa1e6 N |
5654 | */ |
5655 | int must_retry = 0; | |
5656 | spin_lock_irq(&conf->device_lock); | |
2c810cdd | 5657 | if (mddev->reshape_backwards |
b0f9ec04 N |
5658 | ? logical_sector >= conf->reshape_progress |
5659 | : logical_sector < conf->reshape_progress) | |
7ecaa1e6 N |
5660 | /* mismatch, need to try again */ |
5661 | must_retry = 1; | |
5662 | spin_unlock_irq(&conf->device_lock); | |
5663 | if (must_retry) { | |
6d036f7d | 5664 | raid5_release_stripe(sh); |
7a3ab908 | 5665 | schedule(); |
27c0f68f | 5666 | do_prepare = true; |
7ecaa1e6 N |
5667 | goto retry; |
5668 | } | |
5669 | } | |
c46501b2 N |
5670 | if (read_seqcount_retry(&conf->gen_lock, seq)) { |
5671 | /* Might have got the wrong stripe_head | |
5672 | * by accident | |
5673 | */ | |
6d036f7d | 5674 | raid5_release_stripe(sh); |
c46501b2 N |
5675 | goto retry; |
5676 | } | |
e62e58a5 | 5677 | |
ffd96e35 | 5678 | if (rw == WRITE && |
a5c308d4 | 5679 | logical_sector >= mddev->suspend_lo && |
e464eafd | 5680 | logical_sector < mddev->suspend_hi) { |
6d036f7d | 5681 | raid5_release_stripe(sh); |
e62e58a5 N |
5682 | /* As the suspend_* range is controlled by |
5683 | * userspace, we want an interruptible | |
5684 | * wait. | |
5685 | */ | |
5686 | flush_signals(current); | |
5687 | prepare_to_wait(&conf->wait_for_overlap, | |
5688 | &w, TASK_INTERRUPTIBLE); | |
5689 | if (logical_sector >= mddev->suspend_lo && | |
27c0f68f | 5690 | logical_sector < mddev->suspend_hi) { |
e62e58a5 | 5691 | schedule(); |
27c0f68f SL |
5692 | do_prepare = true; |
5693 | } | |
e464eafd N |
5694 | goto retry; |
5695 | } | |
7ecaa1e6 N |
5696 | |
5697 | if (test_bit(STRIPE_EXPANDING, &sh->state) || | |
da41ba65 | 5698 | !add_stripe_bio(sh, bi, dd_idx, rw, previous)) { |
7ecaa1e6 N |
5699 | /* Stripe is busy expanding or |
5700 | * add failed due to overlap. Flush everything | |
1da177e4 LT |
5701 | * and wait a while |
5702 | */ | |
482c0834 | 5703 | md_wakeup_thread(mddev->thread); |
6d036f7d | 5704 | raid5_release_stripe(sh); |
1da177e4 | 5705 | schedule(); |
27c0f68f | 5706 | do_prepare = true; |
1da177e4 LT |
5707 | goto retry; |
5708 | } | |
3bddb7f8 SL |
5709 | if (do_flush) { |
5710 | set_bit(STRIPE_R5C_PREFLUSH, &sh->state); | |
5711 | /* we only need flush for one stripe */ | |
5712 | do_flush = false; | |
5713 | } | |
5714 | ||
6ed3003c N |
5715 | set_bit(STRIPE_HANDLE, &sh->state); |
5716 | clear_bit(STRIPE_DELAYED, &sh->state); | |
59fc630b | 5717 | if ((!sh->batch_head || sh == sh->batch_head) && |
1eff9d32 | 5718 | (bi->bi_opf & REQ_SYNC) && |
729a1866 N |
5719 | !test_and_set_bit(STRIPE_PREREAD_ACTIVE, &sh->state)) |
5720 | atomic_inc(&conf->preread_active_stripes); | |
8811b596 | 5721 | release_stripe_plug(mddev, sh); |
1da177e4 LT |
5722 | } else { |
5723 | /* cannot get stripe for read-ahead, just give-up */ | |
4246a0b6 | 5724 | bi->bi_error = -EIO; |
1da177e4 LT |
5725 | break; |
5726 | } | |
1da177e4 | 5727 | } |
27c0f68f | 5728 | finish_wait(&conf->wait_for_overlap, &w); |
7c13edc8 | 5729 | |
49728050 N |
5730 | if (rw == WRITE) |
5731 | md_write_end(mddev); | |
016c76ac | 5732 | bio_endio(bi); |
1da177e4 LT |
5733 | } |
5734 | ||
fd01b88c | 5735 | static sector_t raid5_size(struct mddev *mddev, sector_t sectors, int raid_disks); |
b522adcd | 5736 | |
fd01b88c | 5737 | static sector_t reshape_request(struct mddev *mddev, sector_t sector_nr, int *skipped) |
1da177e4 | 5738 | { |
52c03291 N |
5739 | /* reshaping is quite different to recovery/resync so it is |
5740 | * handled quite separately ... here. | |
5741 | * | |
5742 | * On each call to sync_request, we gather one chunk worth of | |
5743 | * destination stripes and flag them as expanding. | |
5744 | * Then we find all the source stripes and request reads. | |
5745 | * As the reads complete, handle_stripe will copy the data | |
5746 | * into the destination stripe and release that stripe. | |
5747 | */ | |
d1688a6d | 5748 | struct r5conf *conf = mddev->private; |
1da177e4 | 5749 | struct stripe_head *sh; |
ccfcc3c1 | 5750 | sector_t first_sector, last_sector; |
f416885e N |
5751 | int raid_disks = conf->previous_raid_disks; |
5752 | int data_disks = raid_disks - conf->max_degraded; | |
5753 | int new_data_disks = conf->raid_disks - conf->max_degraded; | |
52c03291 N |
5754 | int i; |
5755 | int dd_idx; | |
c8f517c4 | 5756 | sector_t writepos, readpos, safepos; |
ec32a2bd | 5757 | sector_t stripe_addr; |
7a661381 | 5758 | int reshape_sectors; |
ab69ae12 | 5759 | struct list_head stripes; |
92140480 | 5760 | sector_t retn; |
52c03291 | 5761 | |
fef9c61f N |
5762 | if (sector_nr == 0) { |
5763 | /* If restarting in the middle, skip the initial sectors */ | |
2c810cdd | 5764 | if (mddev->reshape_backwards && |
fef9c61f N |
5765 | conf->reshape_progress < raid5_size(mddev, 0, 0)) { |
5766 | sector_nr = raid5_size(mddev, 0, 0) | |
5767 | - conf->reshape_progress; | |
6cbd8148 N |
5768 | } else if (mddev->reshape_backwards && |
5769 | conf->reshape_progress == MaxSector) { | |
5770 | /* shouldn't happen, but just in case, finish up.*/ | |
5771 | sector_nr = MaxSector; | |
2c810cdd | 5772 | } else if (!mddev->reshape_backwards && |
fef9c61f N |
5773 | conf->reshape_progress > 0) |
5774 | sector_nr = conf->reshape_progress; | |
f416885e | 5775 | sector_div(sector_nr, new_data_disks); |
fef9c61f | 5776 | if (sector_nr) { |
8dee7211 N |
5777 | mddev->curr_resync_completed = sector_nr; |
5778 | sysfs_notify(&mddev->kobj, NULL, "sync_completed"); | |
fef9c61f | 5779 | *skipped = 1; |
92140480 N |
5780 | retn = sector_nr; |
5781 | goto finish; | |
fef9c61f | 5782 | } |
52c03291 N |
5783 | } |
5784 | ||
7a661381 N |
5785 | /* We need to process a full chunk at a time. |
5786 | * If old and new chunk sizes differ, we need to process the | |
5787 | * largest of these | |
5788 | */ | |
3cb5edf4 N |
5789 | |
5790 | reshape_sectors = max(conf->chunk_sectors, conf->prev_chunk_sectors); | |
7a661381 | 5791 | |
b5254dd5 N |
5792 | /* We update the metadata at least every 10 seconds, or when |
5793 | * the data about to be copied would over-write the source of | |
5794 | * the data at the front of the range. i.e. one new_stripe | |
5795 | * along from reshape_progress new_maps to after where | |
5796 | * reshape_safe old_maps to | |
52c03291 | 5797 | */ |
fef9c61f | 5798 | writepos = conf->reshape_progress; |
f416885e | 5799 | sector_div(writepos, new_data_disks); |
c8f517c4 N |
5800 | readpos = conf->reshape_progress; |
5801 | sector_div(readpos, data_disks); | |
fef9c61f | 5802 | safepos = conf->reshape_safe; |
f416885e | 5803 | sector_div(safepos, data_disks); |
2c810cdd | 5804 | if (mddev->reshape_backwards) { |
c74c0d76 N |
5805 | BUG_ON(writepos < reshape_sectors); |
5806 | writepos -= reshape_sectors; | |
c8f517c4 | 5807 | readpos += reshape_sectors; |
7a661381 | 5808 | safepos += reshape_sectors; |
fef9c61f | 5809 | } else { |
7a661381 | 5810 | writepos += reshape_sectors; |
c74c0d76 N |
5811 | /* readpos and safepos are worst-case calculations. |
5812 | * A negative number is overly pessimistic, and causes | |
5813 | * obvious problems for unsigned storage. So clip to 0. | |
5814 | */ | |
ed37d83e N |
5815 | readpos -= min_t(sector_t, reshape_sectors, readpos); |
5816 | safepos -= min_t(sector_t, reshape_sectors, safepos); | |
fef9c61f | 5817 | } |
52c03291 | 5818 | |
b5254dd5 N |
5819 | /* Having calculated the 'writepos' possibly use it |
5820 | * to set 'stripe_addr' which is where we will write to. | |
5821 | */ | |
5822 | if (mddev->reshape_backwards) { | |
5823 | BUG_ON(conf->reshape_progress == 0); | |
5824 | stripe_addr = writepos; | |
5825 | BUG_ON((mddev->dev_sectors & | |
5826 | ~((sector_t)reshape_sectors - 1)) | |
5827 | - reshape_sectors - stripe_addr | |
5828 | != sector_nr); | |
5829 | } else { | |
5830 | BUG_ON(writepos != sector_nr + reshape_sectors); | |
5831 | stripe_addr = sector_nr; | |
5832 | } | |
5833 | ||
c8f517c4 N |
5834 | /* 'writepos' is the most advanced device address we might write. |
5835 | * 'readpos' is the least advanced device address we might read. | |
5836 | * 'safepos' is the least address recorded in the metadata as having | |
5837 | * been reshaped. | |
b5254dd5 N |
5838 | * If there is a min_offset_diff, these are adjusted either by |
5839 | * increasing the safepos/readpos if diff is negative, or | |
5840 | * increasing writepos if diff is positive. | |
5841 | * If 'readpos' is then behind 'writepos', there is no way that we can | |
c8f517c4 N |
5842 | * ensure safety in the face of a crash - that must be done by userspace |
5843 | * making a backup of the data. So in that case there is no particular | |
5844 | * rush to update metadata. | |
5845 | * Otherwise if 'safepos' is behind 'writepos', then we really need to | |
5846 | * update the metadata to advance 'safepos' to match 'readpos' so that | |
5847 | * we can be safe in the event of a crash. | |
5848 | * So we insist on updating metadata if safepos is behind writepos and | |
5849 | * readpos is beyond writepos. | |
5850 | * In any case, update the metadata every 10 seconds. | |
5851 | * Maybe that number should be configurable, but I'm not sure it is | |
5852 | * worth it.... maybe it could be a multiple of safemode_delay??? | |
5853 | */ | |
b5254dd5 N |
5854 | if (conf->min_offset_diff < 0) { |
5855 | safepos += -conf->min_offset_diff; | |
5856 | readpos += -conf->min_offset_diff; | |
5857 | } else | |
5858 | writepos += conf->min_offset_diff; | |
5859 | ||
2c810cdd | 5860 | if ((mddev->reshape_backwards |
c8f517c4 N |
5861 | ? (safepos > writepos && readpos < writepos) |
5862 | : (safepos < writepos && readpos > writepos)) || | |
5863 | time_after(jiffies, conf->reshape_checkpoint + 10*HZ)) { | |
52c03291 N |
5864 | /* Cannot proceed until we've updated the superblock... */ |
5865 | wait_event(conf->wait_for_overlap, | |
c91abf5a N |
5866 | atomic_read(&conf->reshape_stripes)==0 |
5867 | || test_bit(MD_RECOVERY_INTR, &mddev->recovery)); | |
5868 | if (atomic_read(&conf->reshape_stripes) != 0) | |
5869 | return 0; | |
fef9c61f | 5870 | mddev->reshape_position = conf->reshape_progress; |
75d3da43 | 5871 | mddev->curr_resync_completed = sector_nr; |
c8f517c4 | 5872 | conf->reshape_checkpoint = jiffies; |
2953079c | 5873 | set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags); |
52c03291 | 5874 | md_wakeup_thread(mddev->thread); |
2953079c | 5875 | wait_event(mddev->sb_wait, mddev->sb_flags == 0 || |
c91abf5a N |
5876 | test_bit(MD_RECOVERY_INTR, &mddev->recovery)); |
5877 | if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) | |
5878 | return 0; | |
52c03291 | 5879 | spin_lock_irq(&conf->device_lock); |
fef9c61f | 5880 | conf->reshape_safe = mddev->reshape_position; |
52c03291 N |
5881 | spin_unlock_irq(&conf->device_lock); |
5882 | wake_up(&conf->wait_for_overlap); | |
acb180b0 | 5883 | sysfs_notify(&mddev->kobj, NULL, "sync_completed"); |
52c03291 N |
5884 | } |
5885 | ||
ab69ae12 | 5886 | INIT_LIST_HEAD(&stripes); |
7a661381 | 5887 | for (i = 0; i < reshape_sectors; i += STRIPE_SECTORS) { |
52c03291 | 5888 | int j; |
a9f326eb | 5889 | int skipped_disk = 0; |
6d036f7d | 5890 | sh = raid5_get_active_stripe(conf, stripe_addr+i, 0, 0, 1); |
52c03291 N |
5891 | set_bit(STRIPE_EXPANDING, &sh->state); |
5892 | atomic_inc(&conf->reshape_stripes); | |
5893 | /* If any of this stripe is beyond the end of the old | |
5894 | * array, then we need to zero those blocks | |
5895 | */ | |
5896 | for (j=sh->disks; j--;) { | |
5897 | sector_t s; | |
5898 | if (j == sh->pd_idx) | |
5899 | continue; | |
f416885e | 5900 | if (conf->level == 6 && |
d0dabf7e | 5901 | j == sh->qd_idx) |
f416885e | 5902 | continue; |
6d036f7d | 5903 | s = raid5_compute_blocknr(sh, j, 0); |
b522adcd | 5904 | if (s < raid5_size(mddev, 0, 0)) { |
a9f326eb | 5905 | skipped_disk = 1; |
52c03291 N |
5906 | continue; |
5907 | } | |
5908 | memset(page_address(sh->dev[j].page), 0, STRIPE_SIZE); | |
5909 | set_bit(R5_Expanded, &sh->dev[j].flags); | |
5910 | set_bit(R5_UPTODATE, &sh->dev[j].flags); | |
5911 | } | |
a9f326eb | 5912 | if (!skipped_disk) { |
52c03291 N |
5913 | set_bit(STRIPE_EXPAND_READY, &sh->state); |
5914 | set_bit(STRIPE_HANDLE, &sh->state); | |
5915 | } | |
ab69ae12 | 5916 | list_add(&sh->lru, &stripes); |
52c03291 N |
5917 | } |
5918 | spin_lock_irq(&conf->device_lock); | |
2c810cdd | 5919 | if (mddev->reshape_backwards) |
7a661381 | 5920 | conf->reshape_progress -= reshape_sectors * new_data_disks; |
fef9c61f | 5921 | else |
7a661381 | 5922 | conf->reshape_progress += reshape_sectors * new_data_disks; |
52c03291 N |
5923 | spin_unlock_irq(&conf->device_lock); |
5924 | /* Ok, those stripe are ready. We can start scheduling | |
5925 | * reads on the source stripes. | |
5926 | * The source stripes are determined by mapping the first and last | |
5927 | * block on the destination stripes. | |
5928 | */ | |
52c03291 | 5929 | first_sector = |
ec32a2bd | 5930 | raid5_compute_sector(conf, stripe_addr*(new_data_disks), |
911d4ee8 | 5931 | 1, &dd_idx, NULL); |
52c03291 | 5932 | last_sector = |
0e6e0271 | 5933 | raid5_compute_sector(conf, ((stripe_addr+reshape_sectors) |
09c9e5fa | 5934 | * new_data_disks - 1), |
911d4ee8 | 5935 | 1, &dd_idx, NULL); |
58c0fed4 AN |
5936 | if (last_sector >= mddev->dev_sectors) |
5937 | last_sector = mddev->dev_sectors - 1; | |
52c03291 | 5938 | while (first_sector <= last_sector) { |
6d036f7d | 5939 | sh = raid5_get_active_stripe(conf, first_sector, 1, 0, 1); |
52c03291 N |
5940 | set_bit(STRIPE_EXPAND_SOURCE, &sh->state); |
5941 | set_bit(STRIPE_HANDLE, &sh->state); | |
6d036f7d | 5942 | raid5_release_stripe(sh); |
52c03291 N |
5943 | first_sector += STRIPE_SECTORS; |
5944 | } | |
ab69ae12 N |
5945 | /* Now that the sources are clearly marked, we can release |
5946 | * the destination stripes | |
5947 | */ | |
5948 | while (!list_empty(&stripes)) { | |
5949 | sh = list_entry(stripes.next, struct stripe_head, lru); | |
5950 | list_del_init(&sh->lru); | |
6d036f7d | 5951 | raid5_release_stripe(sh); |
ab69ae12 | 5952 | } |
c6207277 N |
5953 | /* If this takes us to the resync_max point where we have to pause, |
5954 | * then we need to write out the superblock. | |
5955 | */ | |
7a661381 | 5956 | sector_nr += reshape_sectors; |
92140480 N |
5957 | retn = reshape_sectors; |
5958 | finish: | |
c5e19d90 N |
5959 | if (mddev->curr_resync_completed > mddev->resync_max || |
5960 | (sector_nr - mddev->curr_resync_completed) * 2 | |
c03f6a19 | 5961 | >= mddev->resync_max - mddev->curr_resync_completed) { |
c6207277 N |
5962 | /* Cannot proceed until we've updated the superblock... */ |
5963 | wait_event(conf->wait_for_overlap, | |
c91abf5a N |
5964 | atomic_read(&conf->reshape_stripes) == 0 |
5965 | || test_bit(MD_RECOVERY_INTR, &mddev->recovery)); | |
5966 | if (atomic_read(&conf->reshape_stripes) != 0) | |
5967 | goto ret; | |
fef9c61f | 5968 | mddev->reshape_position = conf->reshape_progress; |
75d3da43 | 5969 | mddev->curr_resync_completed = sector_nr; |
c8f517c4 | 5970 | conf->reshape_checkpoint = jiffies; |
2953079c | 5971 | set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags); |
c6207277 N |
5972 | md_wakeup_thread(mddev->thread); |
5973 | wait_event(mddev->sb_wait, | |
2953079c | 5974 | !test_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags) |
c91abf5a N |
5975 | || test_bit(MD_RECOVERY_INTR, &mddev->recovery)); |
5976 | if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) | |
5977 | goto ret; | |
c6207277 | 5978 | spin_lock_irq(&conf->device_lock); |
fef9c61f | 5979 | conf->reshape_safe = mddev->reshape_position; |
c6207277 N |
5980 | spin_unlock_irq(&conf->device_lock); |
5981 | wake_up(&conf->wait_for_overlap); | |
acb180b0 | 5982 | sysfs_notify(&mddev->kobj, NULL, "sync_completed"); |
c6207277 | 5983 | } |
c91abf5a | 5984 | ret: |
92140480 | 5985 | return retn; |
52c03291 N |
5986 | } |
5987 | ||
849674e4 SL |
5988 | static inline sector_t raid5_sync_request(struct mddev *mddev, sector_t sector_nr, |
5989 | int *skipped) | |
52c03291 | 5990 | { |
d1688a6d | 5991 | struct r5conf *conf = mddev->private; |
52c03291 | 5992 | struct stripe_head *sh; |
58c0fed4 | 5993 | sector_t max_sector = mddev->dev_sectors; |
57dab0bd | 5994 | sector_t sync_blocks; |
16a53ecc N |
5995 | int still_degraded = 0; |
5996 | int i; | |
1da177e4 | 5997 | |
72626685 | 5998 | if (sector_nr >= max_sector) { |
1da177e4 | 5999 | /* just being told to finish up .. nothing much to do */ |
cea9c228 | 6000 | |
29269553 N |
6001 | if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)) { |
6002 | end_reshape(conf); | |
6003 | return 0; | |
6004 | } | |
72626685 N |
6005 | |
6006 | if (mddev->curr_resync < max_sector) /* aborted */ | |
6007 | bitmap_end_sync(mddev->bitmap, mddev->curr_resync, | |
6008 | &sync_blocks, 1); | |
16a53ecc | 6009 | else /* completed sync */ |
72626685 N |
6010 | conf->fullsync = 0; |
6011 | bitmap_close_sync(mddev->bitmap); | |
6012 | ||
1da177e4 LT |
6013 | return 0; |
6014 | } | |
ccfcc3c1 | 6015 | |
64bd660b N |
6016 | /* Allow raid5_quiesce to complete */ |
6017 | wait_event(conf->wait_for_overlap, conf->quiesce != 2); | |
6018 | ||
52c03291 N |
6019 | if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)) |
6020 | return reshape_request(mddev, sector_nr, skipped); | |
f6705578 | 6021 | |
c6207277 N |
6022 | /* No need to check resync_max as we never do more than one |
6023 | * stripe, and as resync_max will always be on a chunk boundary, | |
6024 | * if the check in md_do_sync didn't fire, there is no chance | |
6025 | * of overstepping resync_max here | |
6026 | */ | |
6027 | ||
16a53ecc | 6028 | /* if there is too many failed drives and we are trying |
1da177e4 LT |
6029 | * to resync, then assert that we are finished, because there is |
6030 | * nothing we can do. | |
6031 | */ | |
3285edf1 | 6032 | if (mddev->degraded >= conf->max_degraded && |
16a53ecc | 6033 | test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) { |
58c0fed4 | 6034 | sector_t rv = mddev->dev_sectors - sector_nr; |
57afd89f | 6035 | *skipped = 1; |
1da177e4 LT |
6036 | return rv; |
6037 | } | |
6f608040 | 6038 | if (!test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery) && |
6039 | !conf->fullsync && | |
6040 | !bitmap_start_sync(mddev->bitmap, sector_nr, &sync_blocks, 1) && | |
6041 | sync_blocks >= STRIPE_SECTORS) { | |
72626685 N |
6042 | /* we can skip this block, and probably more */ |
6043 | sync_blocks /= STRIPE_SECTORS; | |
6044 | *skipped = 1; | |
6045 | return sync_blocks * STRIPE_SECTORS; /* keep things rounded to whole stripes */ | |
6046 | } | |
1da177e4 | 6047 | |
c40f341f | 6048 | bitmap_cond_end_sync(mddev->bitmap, sector_nr, false); |
b47490c9 | 6049 | |
6d036f7d | 6050 | sh = raid5_get_active_stripe(conf, sector_nr, 0, 1, 0); |
1da177e4 | 6051 | if (sh == NULL) { |
6d036f7d | 6052 | sh = raid5_get_active_stripe(conf, sector_nr, 0, 0, 0); |
1da177e4 | 6053 | /* make sure we don't swamp the stripe cache if someone else |
16a53ecc | 6054 | * is trying to get access |
1da177e4 | 6055 | */ |
66c006a5 | 6056 | schedule_timeout_uninterruptible(1); |
1da177e4 | 6057 | } |
16a53ecc | 6058 | /* Need to check if array will still be degraded after recovery/resync |
16d9cfab EM |
6059 | * Note in case of > 1 drive failures it's possible we're rebuilding |
6060 | * one drive while leaving another faulty drive in array. | |
16a53ecc | 6061 | */ |
16d9cfab EM |
6062 | rcu_read_lock(); |
6063 | for (i = 0; i < conf->raid_disks; i++) { | |
6064 | struct md_rdev *rdev = ACCESS_ONCE(conf->disks[i].rdev); | |
6065 | ||
6066 | if (rdev == NULL || test_bit(Faulty, &rdev->flags)) | |
16a53ecc | 6067 | still_degraded = 1; |
16d9cfab EM |
6068 | } |
6069 | rcu_read_unlock(); | |
16a53ecc N |
6070 | |
6071 | bitmap_start_sync(mddev->bitmap, sector_nr, &sync_blocks, still_degraded); | |
6072 | ||
83206d66 | 6073 | set_bit(STRIPE_SYNC_REQUESTED, &sh->state); |
053f5b65 | 6074 | set_bit(STRIPE_HANDLE, &sh->state); |
1da177e4 | 6075 | |
6d036f7d | 6076 | raid5_release_stripe(sh); |
1da177e4 LT |
6077 | |
6078 | return STRIPE_SECTORS; | |
6079 | } | |
6080 | ||
0472a42b N |
6081 | static int retry_aligned_read(struct r5conf *conf, struct bio *raid_bio, |
6082 | unsigned int offset) | |
46031f9a RBJ |
6083 | { |
6084 | /* We may not be able to submit a whole bio at once as there | |
6085 | * may not be enough stripe_heads available. | |
6086 | * We cannot pre-allocate enough stripe_heads as we may need | |
6087 | * more than exist in the cache (if we allow ever large chunks). | |
6088 | * So we do one stripe head at a time and record in | |
6089 | * ->bi_hw_segments how many have been done. | |
6090 | * | |
6091 | * We *know* that this entire raid_bio is in one chunk, so | |
6092 | * it will be only one 'dd_idx' and only need one call to raid5_compute_sector. | |
6093 | */ | |
6094 | struct stripe_head *sh; | |
911d4ee8 | 6095 | int dd_idx; |
46031f9a RBJ |
6096 | sector_t sector, logical_sector, last_sector; |
6097 | int scnt = 0; | |
46031f9a RBJ |
6098 | int handled = 0; |
6099 | ||
4f024f37 KO |
6100 | logical_sector = raid_bio->bi_iter.bi_sector & |
6101 | ~((sector_t)STRIPE_SECTORS-1); | |
112bf897 | 6102 | sector = raid5_compute_sector(conf, logical_sector, |
911d4ee8 | 6103 | 0, &dd_idx, NULL); |
f73a1c7d | 6104 | last_sector = bio_end_sector(raid_bio); |
46031f9a RBJ |
6105 | |
6106 | for (; logical_sector < last_sector; | |
387bb173 NB |
6107 | logical_sector += STRIPE_SECTORS, |
6108 | sector += STRIPE_SECTORS, | |
6109 | scnt++) { | |
46031f9a | 6110 | |
0472a42b | 6111 | if (scnt < offset) |
46031f9a RBJ |
6112 | /* already done this stripe */ |
6113 | continue; | |
6114 | ||
6d036f7d | 6115 | sh = raid5_get_active_stripe(conf, sector, 0, 1, 1); |
46031f9a RBJ |
6116 | |
6117 | if (!sh) { | |
6118 | /* failed to get a stripe - must wait */ | |
46031f9a | 6119 | conf->retry_read_aligned = raid_bio; |
0472a42b | 6120 | conf->retry_read_offset = scnt; |
46031f9a RBJ |
6121 | return handled; |
6122 | } | |
6123 | ||
da41ba65 | 6124 | if (!add_stripe_bio(sh, raid_bio, dd_idx, 0, 0)) { |
6d036f7d | 6125 | raid5_release_stripe(sh); |
387bb173 | 6126 | conf->retry_read_aligned = raid_bio; |
0472a42b | 6127 | conf->retry_read_offset = scnt; |
387bb173 NB |
6128 | return handled; |
6129 | } | |
6130 | ||
3f9e7c14 | 6131 | set_bit(R5_ReadNoMerge, &sh->dev[dd_idx].flags); |
36d1c647 | 6132 | handle_stripe(sh); |
6d036f7d | 6133 | raid5_release_stripe(sh); |
46031f9a RBJ |
6134 | handled++; |
6135 | } | |
016c76ac N |
6136 | |
6137 | bio_endio(raid_bio); | |
6138 | ||
46031f9a | 6139 | if (atomic_dec_and_test(&conf->active_aligned_reads)) |
b1b46486 | 6140 | wake_up(&conf->wait_for_quiescent); |
46031f9a RBJ |
6141 | return handled; |
6142 | } | |
6143 | ||
bfc90cb0 | 6144 | static int handle_active_stripes(struct r5conf *conf, int group, |
566c09c5 SL |
6145 | struct r5worker *worker, |
6146 | struct list_head *temp_inactive_list) | |
46a06401 SL |
6147 | { |
6148 | struct stripe_head *batch[MAX_STRIPE_BATCH], *sh; | |
566c09c5 SL |
6149 | int i, batch_size = 0, hash; |
6150 | bool release_inactive = false; | |
46a06401 SL |
6151 | |
6152 | while (batch_size < MAX_STRIPE_BATCH && | |
851c30c9 | 6153 | (sh = __get_priority_stripe(conf, group)) != NULL) |
46a06401 SL |
6154 | batch[batch_size++] = sh; |
6155 | ||
566c09c5 SL |
6156 | if (batch_size == 0) { |
6157 | for (i = 0; i < NR_STRIPE_HASH_LOCKS; i++) | |
6158 | if (!list_empty(temp_inactive_list + i)) | |
6159 | break; | |
a8c34f91 SL |
6160 | if (i == NR_STRIPE_HASH_LOCKS) { |
6161 | spin_unlock_irq(&conf->device_lock); | |
6162 | r5l_flush_stripe_to_raid(conf->log); | |
6163 | spin_lock_irq(&conf->device_lock); | |
566c09c5 | 6164 | return batch_size; |
a8c34f91 | 6165 | } |
566c09c5 SL |
6166 | release_inactive = true; |
6167 | } | |
46a06401 SL |
6168 | spin_unlock_irq(&conf->device_lock); |
6169 | ||
566c09c5 SL |
6170 | release_inactive_stripe_list(conf, temp_inactive_list, |
6171 | NR_STRIPE_HASH_LOCKS); | |
6172 | ||
a8c34f91 | 6173 | r5l_flush_stripe_to_raid(conf->log); |
566c09c5 SL |
6174 | if (release_inactive) { |
6175 | spin_lock_irq(&conf->device_lock); | |
6176 | return 0; | |
6177 | } | |
6178 | ||
46a06401 SL |
6179 | for (i = 0; i < batch_size; i++) |
6180 | handle_stripe(batch[i]); | |
ff875738 | 6181 | log_write_stripe_run(conf); |
46a06401 SL |
6182 | |
6183 | cond_resched(); | |
6184 | ||
6185 | spin_lock_irq(&conf->device_lock); | |
566c09c5 SL |
6186 | for (i = 0; i < batch_size; i++) { |
6187 | hash = batch[i]->hash_lock_index; | |
6188 | __release_stripe(conf, batch[i], &temp_inactive_list[hash]); | |
6189 | } | |
46a06401 SL |
6190 | return batch_size; |
6191 | } | |
46031f9a | 6192 | |
851c30c9 SL |
6193 | static void raid5_do_work(struct work_struct *work) |
6194 | { | |
6195 | struct r5worker *worker = container_of(work, struct r5worker, work); | |
6196 | struct r5worker_group *group = worker->group; | |
6197 | struct r5conf *conf = group->conf; | |
16d997b7 | 6198 | struct mddev *mddev = conf->mddev; |
851c30c9 SL |
6199 | int group_id = group - conf->worker_groups; |
6200 | int handled; | |
6201 | struct blk_plug plug; | |
6202 | ||
6203 | pr_debug("+++ raid5worker active\n"); | |
6204 | ||
6205 | blk_start_plug(&plug); | |
6206 | handled = 0; | |
6207 | spin_lock_irq(&conf->device_lock); | |
6208 | while (1) { | |
6209 | int batch_size, released; | |
6210 | ||
566c09c5 | 6211 | released = release_stripe_list(conf, worker->temp_inactive_list); |
851c30c9 | 6212 | |
566c09c5 SL |
6213 | batch_size = handle_active_stripes(conf, group_id, worker, |
6214 | worker->temp_inactive_list); | |
bfc90cb0 | 6215 | worker->working = false; |
851c30c9 SL |
6216 | if (!batch_size && !released) |
6217 | break; | |
6218 | handled += batch_size; | |
16d997b7 N |
6219 | wait_event_lock_irq(mddev->sb_wait, |
6220 | !test_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags), | |
6221 | conf->device_lock); | |
851c30c9 SL |
6222 | } |
6223 | pr_debug("%d stripes handled\n", handled); | |
6224 | ||
6225 | spin_unlock_irq(&conf->device_lock); | |
6226 | blk_finish_plug(&plug); | |
6227 | ||
6228 | pr_debug("--- raid5worker inactive\n"); | |
6229 | } | |
6230 | ||
1da177e4 LT |
6231 | /* |
6232 | * This is our raid5 kernel thread. | |
6233 | * | |
6234 | * We scan the hash table for stripes which can be handled now. | |
6235 | * During the scan, completed stripes are saved for us by the interrupt | |
6236 | * handler, so that they will not have to wait for our next wakeup. | |
6237 | */ | |
4ed8731d | 6238 | static void raid5d(struct md_thread *thread) |
1da177e4 | 6239 | { |
4ed8731d | 6240 | struct mddev *mddev = thread->mddev; |
d1688a6d | 6241 | struct r5conf *conf = mddev->private; |
1da177e4 | 6242 | int handled; |
e1dfa0a2 | 6243 | struct blk_plug plug; |
1da177e4 | 6244 | |
45b4233c | 6245 | pr_debug("+++ raid5d active\n"); |
1da177e4 LT |
6246 | |
6247 | md_check_recovery(mddev); | |
1da177e4 | 6248 | |
e1dfa0a2 | 6249 | blk_start_plug(&plug); |
1da177e4 LT |
6250 | handled = 0; |
6251 | spin_lock_irq(&conf->device_lock); | |
6252 | while (1) { | |
46031f9a | 6253 | struct bio *bio; |
773ca82f | 6254 | int batch_size, released; |
0472a42b | 6255 | unsigned int offset; |
773ca82f | 6256 | |
566c09c5 | 6257 | released = release_stripe_list(conf, conf->temp_inactive_list); |
edbe83ab N |
6258 | if (released) |
6259 | clear_bit(R5_DID_ALLOC, &conf->cache_state); | |
1da177e4 | 6260 | |
0021b7bc | 6261 | if ( |
7c13edc8 N |
6262 | !list_empty(&conf->bitmap_list)) { |
6263 | /* Now is a good time to flush some bitmap updates */ | |
6264 | conf->seq_flush++; | |
700e432d | 6265 | spin_unlock_irq(&conf->device_lock); |
72626685 | 6266 | bitmap_unplug(mddev->bitmap); |
700e432d | 6267 | spin_lock_irq(&conf->device_lock); |
7c13edc8 | 6268 | conf->seq_write = conf->seq_flush; |
566c09c5 | 6269 | activate_bit_delay(conf, conf->temp_inactive_list); |
72626685 | 6270 | } |
0021b7bc | 6271 | raid5_activate_delayed(conf); |
72626685 | 6272 | |
0472a42b | 6273 | while ((bio = remove_bio_from_retry(conf, &offset))) { |
46031f9a RBJ |
6274 | int ok; |
6275 | spin_unlock_irq(&conf->device_lock); | |
0472a42b | 6276 | ok = retry_aligned_read(conf, bio, offset); |
46031f9a RBJ |
6277 | spin_lock_irq(&conf->device_lock); |
6278 | if (!ok) | |
6279 | break; | |
6280 | handled++; | |
6281 | } | |
6282 | ||
566c09c5 SL |
6283 | batch_size = handle_active_stripes(conf, ANY_GROUP, NULL, |
6284 | conf->temp_inactive_list); | |
773ca82f | 6285 | if (!batch_size && !released) |
1da177e4 | 6286 | break; |
46a06401 | 6287 | handled += batch_size; |
1da177e4 | 6288 | |
2953079c | 6289 | if (mddev->sb_flags & ~(1 << MD_SB_CHANGE_PENDING)) { |
46a06401 | 6290 | spin_unlock_irq(&conf->device_lock); |
de393cde | 6291 | md_check_recovery(mddev); |
46a06401 SL |
6292 | spin_lock_irq(&conf->device_lock); |
6293 | } | |
1da177e4 | 6294 | } |
45b4233c | 6295 | pr_debug("%d stripes handled\n", handled); |
1da177e4 LT |
6296 | |
6297 | spin_unlock_irq(&conf->device_lock); | |
2d5b569b N |
6298 | if (test_and_clear_bit(R5_ALLOC_MORE, &conf->cache_state) && |
6299 | mutex_trylock(&conf->cache_size_mutex)) { | |
edbe83ab N |
6300 | grow_one_stripe(conf, __GFP_NOWARN); |
6301 | /* Set flag even if allocation failed. This helps | |
6302 | * slow down allocation requests when mem is short | |
6303 | */ | |
6304 | set_bit(R5_DID_ALLOC, &conf->cache_state); | |
2d5b569b | 6305 | mutex_unlock(&conf->cache_size_mutex); |
edbe83ab | 6306 | } |
1da177e4 | 6307 | |
765d704d SL |
6308 | flush_deferred_bios(conf); |
6309 | ||
0576b1c6 SL |
6310 | r5l_flush_stripe_to_raid(conf->log); |
6311 | ||
c9f21aaf | 6312 | async_tx_issue_pending_all(); |
e1dfa0a2 | 6313 | blk_finish_plug(&plug); |
1da177e4 | 6314 | |
45b4233c | 6315 | pr_debug("--- raid5d inactive\n"); |
1da177e4 LT |
6316 | } |
6317 | ||
3f294f4f | 6318 | static ssize_t |
fd01b88c | 6319 | raid5_show_stripe_cache_size(struct mddev *mddev, char *page) |
3f294f4f | 6320 | { |
7b1485ba N |
6321 | struct r5conf *conf; |
6322 | int ret = 0; | |
6323 | spin_lock(&mddev->lock); | |
6324 | conf = mddev->private; | |
96de1e66 | 6325 | if (conf) |
edbe83ab | 6326 | ret = sprintf(page, "%d\n", conf->min_nr_stripes); |
7b1485ba N |
6327 | spin_unlock(&mddev->lock); |
6328 | return ret; | |
3f294f4f N |
6329 | } |
6330 | ||
c41d4ac4 | 6331 | int |
fd01b88c | 6332 | raid5_set_cache_size(struct mddev *mddev, int size) |
3f294f4f | 6333 | { |
d1688a6d | 6334 | struct r5conf *conf = mddev->private; |
b5470dc5 | 6335 | |
c41d4ac4 | 6336 | if (size <= 16 || size > 32768) |
3f294f4f | 6337 | return -EINVAL; |
486f0644 | 6338 | |
edbe83ab | 6339 | conf->min_nr_stripes = size; |
2d5b569b | 6340 | mutex_lock(&conf->cache_size_mutex); |
486f0644 N |
6341 | while (size < conf->max_nr_stripes && |
6342 | drop_one_stripe(conf)) | |
6343 | ; | |
2d5b569b | 6344 | mutex_unlock(&conf->cache_size_mutex); |
486f0644 | 6345 | |
2214c260 | 6346 | md_allow_write(mddev); |
486f0644 | 6347 | |
2d5b569b | 6348 | mutex_lock(&conf->cache_size_mutex); |
486f0644 N |
6349 | while (size > conf->max_nr_stripes) |
6350 | if (!grow_one_stripe(conf, GFP_KERNEL)) | |
6351 | break; | |
2d5b569b | 6352 | mutex_unlock(&conf->cache_size_mutex); |
486f0644 | 6353 | |
c41d4ac4 N |
6354 | return 0; |
6355 | } | |
6356 | EXPORT_SYMBOL(raid5_set_cache_size); | |
6357 | ||
6358 | static ssize_t | |
fd01b88c | 6359 | raid5_store_stripe_cache_size(struct mddev *mddev, const char *page, size_t len) |
c41d4ac4 | 6360 | { |
6791875e | 6361 | struct r5conf *conf; |
c41d4ac4 N |
6362 | unsigned long new; |
6363 | int err; | |
6364 | ||
6365 | if (len >= PAGE_SIZE) | |
6366 | return -EINVAL; | |
b29bebd6 | 6367 | if (kstrtoul(page, 10, &new)) |
c41d4ac4 | 6368 | return -EINVAL; |
6791875e | 6369 | err = mddev_lock(mddev); |
c41d4ac4 N |
6370 | if (err) |
6371 | return err; | |
6791875e N |
6372 | conf = mddev->private; |
6373 | if (!conf) | |
6374 | err = -ENODEV; | |
6375 | else | |
6376 | err = raid5_set_cache_size(mddev, new); | |
6377 | mddev_unlock(mddev); | |
6378 | ||
6379 | return err ?: len; | |
3f294f4f | 6380 | } |
007583c9 | 6381 | |
96de1e66 N |
6382 | static struct md_sysfs_entry |
6383 | raid5_stripecache_size = __ATTR(stripe_cache_size, S_IRUGO | S_IWUSR, | |
6384 | raid5_show_stripe_cache_size, | |
6385 | raid5_store_stripe_cache_size); | |
3f294f4f | 6386 | |
d06f191f MS |
6387 | static ssize_t |
6388 | raid5_show_rmw_level(struct mddev *mddev, char *page) | |
6389 | { | |
6390 | struct r5conf *conf = mddev->private; | |
6391 | if (conf) | |
6392 | return sprintf(page, "%d\n", conf->rmw_level); | |
6393 | else | |
6394 | return 0; | |
6395 | } | |
6396 | ||
6397 | static ssize_t | |
6398 | raid5_store_rmw_level(struct mddev *mddev, const char *page, size_t len) | |
6399 | { | |
6400 | struct r5conf *conf = mddev->private; | |
6401 | unsigned long new; | |
6402 | ||
6403 | if (!conf) | |
6404 | return -ENODEV; | |
6405 | ||
6406 | if (len >= PAGE_SIZE) | |
6407 | return -EINVAL; | |
6408 | ||
6409 | if (kstrtoul(page, 10, &new)) | |
6410 | return -EINVAL; | |
6411 | ||
6412 | if (new != PARITY_DISABLE_RMW && !raid6_call.xor_syndrome) | |
6413 | return -EINVAL; | |
6414 | ||
6415 | if (new != PARITY_DISABLE_RMW && | |
6416 | new != PARITY_ENABLE_RMW && | |
6417 | new != PARITY_PREFER_RMW) | |
6418 | return -EINVAL; | |
6419 | ||
6420 | conf->rmw_level = new; | |
6421 | return len; | |
6422 | } | |
6423 | ||
6424 | static struct md_sysfs_entry | |
6425 | raid5_rmw_level = __ATTR(rmw_level, S_IRUGO | S_IWUSR, | |
6426 | raid5_show_rmw_level, | |
6427 | raid5_store_rmw_level); | |
6428 | ||
6429 | ||
8b3e6cdc | 6430 | static ssize_t |
fd01b88c | 6431 | raid5_show_preread_threshold(struct mddev *mddev, char *page) |
8b3e6cdc | 6432 | { |
7b1485ba N |
6433 | struct r5conf *conf; |
6434 | int ret = 0; | |
6435 | spin_lock(&mddev->lock); | |
6436 | conf = mddev->private; | |
8b3e6cdc | 6437 | if (conf) |
7b1485ba N |
6438 | ret = sprintf(page, "%d\n", conf->bypass_threshold); |
6439 | spin_unlock(&mddev->lock); | |
6440 | return ret; | |
8b3e6cdc DW |
6441 | } |
6442 | ||
6443 | static ssize_t | |
fd01b88c | 6444 | raid5_store_preread_threshold(struct mddev *mddev, const char *page, size_t len) |
8b3e6cdc | 6445 | { |
6791875e | 6446 | struct r5conf *conf; |
4ef197d8 | 6447 | unsigned long new; |
6791875e N |
6448 | int err; |
6449 | ||
8b3e6cdc DW |
6450 | if (len >= PAGE_SIZE) |
6451 | return -EINVAL; | |
b29bebd6 | 6452 | if (kstrtoul(page, 10, &new)) |
8b3e6cdc | 6453 | return -EINVAL; |
6791875e N |
6454 | |
6455 | err = mddev_lock(mddev); | |
6456 | if (err) | |
6457 | return err; | |
6458 | conf = mddev->private; | |
6459 | if (!conf) | |
6460 | err = -ENODEV; | |
edbe83ab | 6461 | else if (new > conf->min_nr_stripes) |
6791875e N |
6462 | err = -EINVAL; |
6463 | else | |
6464 | conf->bypass_threshold = new; | |
6465 | mddev_unlock(mddev); | |
6466 | return err ?: len; | |
8b3e6cdc DW |
6467 | } |
6468 | ||
6469 | static struct md_sysfs_entry | |
6470 | raid5_preread_bypass_threshold = __ATTR(preread_bypass_threshold, | |
6471 | S_IRUGO | S_IWUSR, | |
6472 | raid5_show_preread_threshold, | |
6473 | raid5_store_preread_threshold); | |
6474 | ||
d592a996 SL |
6475 | static ssize_t |
6476 | raid5_show_skip_copy(struct mddev *mddev, char *page) | |
6477 | { | |
7b1485ba N |
6478 | struct r5conf *conf; |
6479 | int ret = 0; | |
6480 | spin_lock(&mddev->lock); | |
6481 | conf = mddev->private; | |
d592a996 | 6482 | if (conf) |
7b1485ba N |
6483 | ret = sprintf(page, "%d\n", conf->skip_copy); |
6484 | spin_unlock(&mddev->lock); | |
6485 | return ret; | |
d592a996 SL |
6486 | } |
6487 | ||
6488 | static ssize_t | |
6489 | raid5_store_skip_copy(struct mddev *mddev, const char *page, size_t len) | |
6490 | { | |
6791875e | 6491 | struct r5conf *conf; |
d592a996 | 6492 | unsigned long new; |
6791875e N |
6493 | int err; |
6494 | ||
d592a996 SL |
6495 | if (len >= PAGE_SIZE) |
6496 | return -EINVAL; | |
d592a996 SL |
6497 | if (kstrtoul(page, 10, &new)) |
6498 | return -EINVAL; | |
6499 | new = !!new; | |
6791875e N |
6500 | |
6501 | err = mddev_lock(mddev); | |
6502 | if (err) | |
6503 | return err; | |
6504 | conf = mddev->private; | |
6505 | if (!conf) | |
6506 | err = -ENODEV; | |
6507 | else if (new != conf->skip_copy) { | |
6508 | mddev_suspend(mddev); | |
6509 | conf->skip_copy = new; | |
6510 | if (new) | |
dc3b17cc | 6511 | mddev->queue->backing_dev_info->capabilities |= |
6791875e N |
6512 | BDI_CAP_STABLE_WRITES; |
6513 | else | |
dc3b17cc | 6514 | mddev->queue->backing_dev_info->capabilities &= |
6791875e N |
6515 | ~BDI_CAP_STABLE_WRITES; |
6516 | mddev_resume(mddev); | |
6517 | } | |
6518 | mddev_unlock(mddev); | |
6519 | return err ?: len; | |
d592a996 SL |
6520 | } |
6521 | ||
6522 | static struct md_sysfs_entry | |
6523 | raid5_skip_copy = __ATTR(skip_copy, S_IRUGO | S_IWUSR, | |
6524 | raid5_show_skip_copy, | |
6525 | raid5_store_skip_copy); | |
6526 | ||
3f294f4f | 6527 | static ssize_t |
fd01b88c | 6528 | stripe_cache_active_show(struct mddev *mddev, char *page) |
3f294f4f | 6529 | { |
d1688a6d | 6530 | struct r5conf *conf = mddev->private; |
96de1e66 N |
6531 | if (conf) |
6532 | return sprintf(page, "%d\n", atomic_read(&conf->active_stripes)); | |
6533 | else | |
6534 | return 0; | |
3f294f4f N |
6535 | } |
6536 | ||
96de1e66 N |
6537 | static struct md_sysfs_entry |
6538 | raid5_stripecache_active = __ATTR_RO(stripe_cache_active); | |
3f294f4f | 6539 | |
b721420e SL |
6540 | static ssize_t |
6541 | raid5_show_group_thread_cnt(struct mddev *mddev, char *page) | |
6542 | { | |
7b1485ba N |
6543 | struct r5conf *conf; |
6544 | int ret = 0; | |
6545 | spin_lock(&mddev->lock); | |
6546 | conf = mddev->private; | |
b721420e | 6547 | if (conf) |
7b1485ba N |
6548 | ret = sprintf(page, "%d\n", conf->worker_cnt_per_group); |
6549 | spin_unlock(&mddev->lock); | |
6550 | return ret; | |
b721420e SL |
6551 | } |
6552 | ||
60aaf933 | 6553 | static int alloc_thread_groups(struct r5conf *conf, int cnt, |
6554 | int *group_cnt, | |
6555 | int *worker_cnt_per_group, | |
6556 | struct r5worker_group **worker_groups); | |
b721420e SL |
6557 | static ssize_t |
6558 | raid5_store_group_thread_cnt(struct mddev *mddev, const char *page, size_t len) | |
6559 | { | |
6791875e | 6560 | struct r5conf *conf; |
b721420e SL |
6561 | unsigned long new; |
6562 | int err; | |
60aaf933 | 6563 | struct r5worker_group *new_groups, *old_groups; |
6564 | int group_cnt, worker_cnt_per_group; | |
b721420e SL |
6565 | |
6566 | if (len >= PAGE_SIZE) | |
6567 | return -EINVAL; | |
b721420e SL |
6568 | if (kstrtoul(page, 10, &new)) |
6569 | return -EINVAL; | |
6570 | ||
6791875e N |
6571 | err = mddev_lock(mddev); |
6572 | if (err) | |
6573 | return err; | |
6574 | conf = mddev->private; | |
6575 | if (!conf) | |
6576 | err = -ENODEV; | |
6577 | else if (new != conf->worker_cnt_per_group) { | |
6578 | mddev_suspend(mddev); | |
b721420e | 6579 | |
6791875e N |
6580 | old_groups = conf->worker_groups; |
6581 | if (old_groups) | |
6582 | flush_workqueue(raid5_wq); | |
d206dcfa | 6583 | |
6791875e N |
6584 | err = alloc_thread_groups(conf, new, |
6585 | &group_cnt, &worker_cnt_per_group, | |
6586 | &new_groups); | |
6587 | if (!err) { | |
6588 | spin_lock_irq(&conf->device_lock); | |
6589 | conf->group_cnt = group_cnt; | |
6590 | conf->worker_cnt_per_group = worker_cnt_per_group; | |
6591 | conf->worker_groups = new_groups; | |
6592 | spin_unlock_irq(&conf->device_lock); | |
b721420e | 6593 | |
6791875e N |
6594 | if (old_groups) |
6595 | kfree(old_groups[0].workers); | |
6596 | kfree(old_groups); | |
6597 | } | |
6598 | mddev_resume(mddev); | |
b721420e | 6599 | } |
6791875e | 6600 | mddev_unlock(mddev); |
b721420e | 6601 | |
6791875e | 6602 | return err ?: len; |
b721420e SL |
6603 | } |
6604 | ||
6605 | static struct md_sysfs_entry | |
6606 | raid5_group_thread_cnt = __ATTR(group_thread_cnt, S_IRUGO | S_IWUSR, | |
6607 | raid5_show_group_thread_cnt, | |
6608 | raid5_store_group_thread_cnt); | |
6609 | ||
007583c9 | 6610 | static struct attribute *raid5_attrs[] = { |
3f294f4f N |
6611 | &raid5_stripecache_size.attr, |
6612 | &raid5_stripecache_active.attr, | |
8b3e6cdc | 6613 | &raid5_preread_bypass_threshold.attr, |
b721420e | 6614 | &raid5_group_thread_cnt.attr, |
d592a996 | 6615 | &raid5_skip_copy.attr, |
d06f191f | 6616 | &raid5_rmw_level.attr, |
2c7da14b | 6617 | &r5c_journal_mode.attr, |
3f294f4f N |
6618 | NULL, |
6619 | }; | |
007583c9 N |
6620 | static struct attribute_group raid5_attrs_group = { |
6621 | .name = NULL, | |
6622 | .attrs = raid5_attrs, | |
3f294f4f N |
6623 | }; |
6624 | ||
60aaf933 | 6625 | static int alloc_thread_groups(struct r5conf *conf, int cnt, |
6626 | int *group_cnt, | |
6627 | int *worker_cnt_per_group, | |
6628 | struct r5worker_group **worker_groups) | |
851c30c9 | 6629 | { |
566c09c5 | 6630 | int i, j, k; |
851c30c9 SL |
6631 | ssize_t size; |
6632 | struct r5worker *workers; | |
6633 | ||
60aaf933 | 6634 | *worker_cnt_per_group = cnt; |
851c30c9 | 6635 | if (cnt == 0) { |
60aaf933 | 6636 | *group_cnt = 0; |
6637 | *worker_groups = NULL; | |
851c30c9 SL |
6638 | return 0; |
6639 | } | |
60aaf933 | 6640 | *group_cnt = num_possible_nodes(); |
851c30c9 | 6641 | size = sizeof(struct r5worker) * cnt; |
60aaf933 | 6642 | workers = kzalloc(size * *group_cnt, GFP_NOIO); |
6643 | *worker_groups = kzalloc(sizeof(struct r5worker_group) * | |
6644 | *group_cnt, GFP_NOIO); | |
6645 | if (!*worker_groups || !workers) { | |
851c30c9 | 6646 | kfree(workers); |
60aaf933 | 6647 | kfree(*worker_groups); |
851c30c9 SL |
6648 | return -ENOMEM; |
6649 | } | |
6650 | ||
60aaf933 | 6651 | for (i = 0; i < *group_cnt; i++) { |
851c30c9 SL |
6652 | struct r5worker_group *group; |
6653 | ||
0c775d52 | 6654 | group = &(*worker_groups)[i]; |
851c30c9 | 6655 | INIT_LIST_HEAD(&group->handle_list); |
535ae4eb | 6656 | INIT_LIST_HEAD(&group->loprio_list); |
851c30c9 SL |
6657 | group->conf = conf; |
6658 | group->workers = workers + i * cnt; | |
6659 | ||
6660 | for (j = 0; j < cnt; j++) { | |
566c09c5 SL |
6661 | struct r5worker *worker = group->workers + j; |
6662 | worker->group = group; | |
6663 | INIT_WORK(&worker->work, raid5_do_work); | |
6664 | ||
6665 | for (k = 0; k < NR_STRIPE_HASH_LOCKS; k++) | |
6666 | INIT_LIST_HEAD(worker->temp_inactive_list + k); | |
851c30c9 SL |
6667 | } |
6668 | } | |
6669 | ||
6670 | return 0; | |
6671 | } | |
6672 | ||
6673 | static void free_thread_groups(struct r5conf *conf) | |
6674 | { | |
6675 | if (conf->worker_groups) | |
6676 | kfree(conf->worker_groups[0].workers); | |
6677 | kfree(conf->worker_groups); | |
6678 | conf->worker_groups = NULL; | |
6679 | } | |
6680 | ||
80c3a6ce | 6681 | static sector_t |
fd01b88c | 6682 | raid5_size(struct mddev *mddev, sector_t sectors, int raid_disks) |
80c3a6ce | 6683 | { |
d1688a6d | 6684 | struct r5conf *conf = mddev->private; |
80c3a6ce DW |
6685 | |
6686 | if (!sectors) | |
6687 | sectors = mddev->dev_sectors; | |
5e5e3e78 | 6688 | if (!raid_disks) |
7ec05478 | 6689 | /* size is defined by the smallest of previous and new size */ |
5e5e3e78 | 6690 | raid_disks = min(conf->raid_disks, conf->previous_raid_disks); |
80c3a6ce | 6691 | |
3cb5edf4 N |
6692 | sectors &= ~((sector_t)conf->chunk_sectors - 1); |
6693 | sectors &= ~((sector_t)conf->prev_chunk_sectors - 1); | |
80c3a6ce DW |
6694 | return sectors * (raid_disks - conf->max_degraded); |
6695 | } | |
6696 | ||
789b5e03 ON |
6697 | static void free_scratch_buffer(struct r5conf *conf, struct raid5_percpu *percpu) |
6698 | { | |
6699 | safe_put_page(percpu->spare_page); | |
46d5b785 | 6700 | if (percpu->scribble) |
6701 | flex_array_free(percpu->scribble); | |
789b5e03 ON |
6702 | percpu->spare_page = NULL; |
6703 | percpu->scribble = NULL; | |
6704 | } | |
6705 | ||
6706 | static int alloc_scratch_buffer(struct r5conf *conf, struct raid5_percpu *percpu) | |
6707 | { | |
6708 | if (conf->level == 6 && !percpu->spare_page) | |
6709 | percpu->spare_page = alloc_page(GFP_KERNEL); | |
6710 | if (!percpu->scribble) | |
46d5b785 | 6711 | percpu->scribble = scribble_alloc(max(conf->raid_disks, |
738a2738 N |
6712 | conf->previous_raid_disks), |
6713 | max(conf->chunk_sectors, | |
6714 | conf->prev_chunk_sectors) | |
6715 | / STRIPE_SECTORS, | |
6716 | GFP_KERNEL); | |
789b5e03 ON |
6717 | |
6718 | if (!percpu->scribble || (conf->level == 6 && !percpu->spare_page)) { | |
6719 | free_scratch_buffer(conf, percpu); | |
6720 | return -ENOMEM; | |
6721 | } | |
6722 | ||
6723 | return 0; | |
6724 | } | |
6725 | ||
29c6d1bb | 6726 | static int raid456_cpu_dead(unsigned int cpu, struct hlist_node *node) |
36d1c647 | 6727 | { |
29c6d1bb SAS |
6728 | struct r5conf *conf = hlist_entry_safe(node, struct r5conf, node); |
6729 | ||
6730 | free_scratch_buffer(conf, per_cpu_ptr(conf->percpu, cpu)); | |
6731 | return 0; | |
6732 | } | |
36d1c647 | 6733 | |
29c6d1bb SAS |
6734 | static void raid5_free_percpu(struct r5conf *conf) |
6735 | { | |
36d1c647 DW |
6736 | if (!conf->percpu) |
6737 | return; | |
6738 | ||
29c6d1bb | 6739 | cpuhp_state_remove_instance(CPUHP_MD_RAID5_PREPARE, &conf->node); |
36d1c647 DW |
6740 | free_percpu(conf->percpu); |
6741 | } | |
6742 | ||
d1688a6d | 6743 | static void free_conf(struct r5conf *conf) |
95fc17aa | 6744 | { |
d7bd398e SL |
6745 | int i; |
6746 | ||
ff875738 AP |
6747 | log_exit(conf); |
6748 | ||
30c89465 | 6749 | if (conf->shrinker.nr_deferred) |
edbe83ab | 6750 | unregister_shrinker(&conf->shrinker); |
5c7e81c3 | 6751 | |
851c30c9 | 6752 | free_thread_groups(conf); |
95fc17aa | 6753 | shrink_stripes(conf); |
36d1c647 | 6754 | raid5_free_percpu(conf); |
d7bd398e SL |
6755 | for (i = 0; i < conf->pool_size; i++) |
6756 | if (conf->disks[i].extra_page) | |
6757 | put_page(conf->disks[i].extra_page); | |
95fc17aa | 6758 | kfree(conf->disks); |
dd7a8f5d N |
6759 | if (conf->bio_split) |
6760 | bioset_free(conf->bio_split); | |
95fc17aa | 6761 | kfree(conf->stripe_hashtbl); |
aaf9f12e | 6762 | kfree(conf->pending_data); |
95fc17aa DW |
6763 | kfree(conf); |
6764 | } | |
6765 | ||
29c6d1bb | 6766 | static int raid456_cpu_up_prepare(unsigned int cpu, struct hlist_node *node) |
36d1c647 | 6767 | { |
29c6d1bb | 6768 | struct r5conf *conf = hlist_entry_safe(node, struct r5conf, node); |
36d1c647 DW |
6769 | struct raid5_percpu *percpu = per_cpu_ptr(conf->percpu, cpu); |
6770 | ||
29c6d1bb | 6771 | if (alloc_scratch_buffer(conf, percpu)) { |
cc6167b4 N |
6772 | pr_warn("%s: failed memory allocation for cpu%u\n", |
6773 | __func__, cpu); | |
29c6d1bb | 6774 | return -ENOMEM; |
36d1c647 | 6775 | } |
29c6d1bb | 6776 | return 0; |
36d1c647 | 6777 | } |
36d1c647 | 6778 | |
d1688a6d | 6779 | static int raid5_alloc_percpu(struct r5conf *conf) |
36d1c647 | 6780 | { |
789b5e03 | 6781 | int err = 0; |
36d1c647 | 6782 | |
789b5e03 ON |
6783 | conf->percpu = alloc_percpu(struct raid5_percpu); |
6784 | if (!conf->percpu) | |
36d1c647 | 6785 | return -ENOMEM; |
789b5e03 | 6786 | |
29c6d1bb | 6787 | err = cpuhp_state_add_instance(CPUHP_MD_RAID5_PREPARE, &conf->node); |
27a353c0 SL |
6788 | if (!err) { |
6789 | conf->scribble_disks = max(conf->raid_disks, | |
6790 | conf->previous_raid_disks); | |
6791 | conf->scribble_sectors = max(conf->chunk_sectors, | |
6792 | conf->prev_chunk_sectors); | |
6793 | } | |
36d1c647 DW |
6794 | return err; |
6795 | } | |
6796 | ||
edbe83ab N |
6797 | static unsigned long raid5_cache_scan(struct shrinker *shrink, |
6798 | struct shrink_control *sc) | |
6799 | { | |
6800 | struct r5conf *conf = container_of(shrink, struct r5conf, shrinker); | |
2d5b569b N |
6801 | unsigned long ret = SHRINK_STOP; |
6802 | ||
6803 | if (mutex_trylock(&conf->cache_size_mutex)) { | |
6804 | ret= 0; | |
49895bcc N |
6805 | while (ret < sc->nr_to_scan && |
6806 | conf->max_nr_stripes > conf->min_nr_stripes) { | |
2d5b569b N |
6807 | if (drop_one_stripe(conf) == 0) { |
6808 | ret = SHRINK_STOP; | |
6809 | break; | |
6810 | } | |
6811 | ret++; | |
6812 | } | |
6813 | mutex_unlock(&conf->cache_size_mutex); | |
edbe83ab N |
6814 | } |
6815 | return ret; | |
6816 | } | |
6817 | ||
6818 | static unsigned long raid5_cache_count(struct shrinker *shrink, | |
6819 | struct shrink_control *sc) | |
6820 | { | |
6821 | struct r5conf *conf = container_of(shrink, struct r5conf, shrinker); | |
6822 | ||
6823 | if (conf->max_nr_stripes < conf->min_nr_stripes) | |
6824 | /* unlikely, but not impossible */ | |
6825 | return 0; | |
6826 | return conf->max_nr_stripes - conf->min_nr_stripes; | |
6827 | } | |
6828 | ||
d1688a6d | 6829 | static struct r5conf *setup_conf(struct mddev *mddev) |
1da177e4 | 6830 | { |
d1688a6d | 6831 | struct r5conf *conf; |
5e5e3e78 | 6832 | int raid_disk, memory, max_disks; |
3cb03002 | 6833 | struct md_rdev *rdev; |
1da177e4 | 6834 | struct disk_info *disk; |
0232605d | 6835 | char pers_name[6]; |
566c09c5 | 6836 | int i; |
60aaf933 | 6837 | int group_cnt, worker_cnt_per_group; |
6838 | struct r5worker_group *new_group; | |
1da177e4 | 6839 | |
91adb564 N |
6840 | if (mddev->new_level != 5 |
6841 | && mddev->new_level != 4 | |
6842 | && mddev->new_level != 6) { | |
cc6167b4 N |
6843 | pr_warn("md/raid:%s: raid level not set to 4/5/6 (%d)\n", |
6844 | mdname(mddev), mddev->new_level); | |
91adb564 | 6845 | return ERR_PTR(-EIO); |
1da177e4 | 6846 | } |
91adb564 N |
6847 | if ((mddev->new_level == 5 |
6848 | && !algorithm_valid_raid5(mddev->new_layout)) || | |
6849 | (mddev->new_level == 6 | |
6850 | && !algorithm_valid_raid6(mddev->new_layout))) { | |
cc6167b4 N |
6851 | pr_warn("md/raid:%s: layout %d not supported\n", |
6852 | mdname(mddev), mddev->new_layout); | |
91adb564 | 6853 | return ERR_PTR(-EIO); |
99c0fb5f | 6854 | } |
91adb564 | 6855 | if (mddev->new_level == 6 && mddev->raid_disks < 4) { |
cc6167b4 N |
6856 | pr_warn("md/raid:%s: not enough configured devices (%d, minimum 4)\n", |
6857 | mdname(mddev), mddev->raid_disks); | |
91adb564 | 6858 | return ERR_PTR(-EINVAL); |
4bbf3771 N |
6859 | } |
6860 | ||
664e7c41 AN |
6861 | if (!mddev->new_chunk_sectors || |
6862 | (mddev->new_chunk_sectors << 9) % PAGE_SIZE || | |
6863 | !is_power_of_2(mddev->new_chunk_sectors)) { | |
cc6167b4 N |
6864 | pr_warn("md/raid:%s: invalid chunk size %d\n", |
6865 | mdname(mddev), mddev->new_chunk_sectors << 9); | |
91adb564 | 6866 | return ERR_PTR(-EINVAL); |
f6705578 N |
6867 | } |
6868 | ||
d1688a6d | 6869 | conf = kzalloc(sizeof(struct r5conf), GFP_KERNEL); |
91adb564 | 6870 | if (conf == NULL) |
1da177e4 | 6871 | goto abort; |
aaf9f12e SL |
6872 | INIT_LIST_HEAD(&conf->free_list); |
6873 | INIT_LIST_HEAD(&conf->pending_list); | |
6874 | conf->pending_data = kzalloc(sizeof(struct r5pending_data) * | |
6875 | PENDING_IO_MAX, GFP_KERNEL); | |
6876 | if (!conf->pending_data) | |
6877 | goto abort; | |
6878 | for (i = 0; i < PENDING_IO_MAX; i++) | |
6879 | list_add(&conf->pending_data[i].sibling, &conf->free_list); | |
851c30c9 | 6880 | /* Don't enable multi-threading by default*/ |
60aaf933 | 6881 | if (!alloc_thread_groups(conf, 0, &group_cnt, &worker_cnt_per_group, |
6882 | &new_group)) { | |
6883 | conf->group_cnt = group_cnt; | |
6884 | conf->worker_cnt_per_group = worker_cnt_per_group; | |
6885 | conf->worker_groups = new_group; | |
6886 | } else | |
851c30c9 | 6887 | goto abort; |
f5efd45a | 6888 | spin_lock_init(&conf->device_lock); |
c46501b2 | 6889 | seqcount_init(&conf->gen_lock); |
2d5b569b | 6890 | mutex_init(&conf->cache_size_mutex); |
b1b46486 | 6891 | init_waitqueue_head(&conf->wait_for_quiescent); |
6ab2a4b8 | 6892 | init_waitqueue_head(&conf->wait_for_stripe); |
f5efd45a DW |
6893 | init_waitqueue_head(&conf->wait_for_overlap); |
6894 | INIT_LIST_HEAD(&conf->handle_list); | |
535ae4eb | 6895 | INIT_LIST_HEAD(&conf->loprio_list); |
f5efd45a DW |
6896 | INIT_LIST_HEAD(&conf->hold_list); |
6897 | INIT_LIST_HEAD(&conf->delayed_list); | |
6898 | INIT_LIST_HEAD(&conf->bitmap_list); | |
773ca82f | 6899 | init_llist_head(&conf->released_stripes); |
f5efd45a DW |
6900 | atomic_set(&conf->active_stripes, 0); |
6901 | atomic_set(&conf->preread_active_stripes, 0); | |
6902 | atomic_set(&conf->active_aligned_reads, 0); | |
765d704d SL |
6903 | spin_lock_init(&conf->pending_bios_lock); |
6904 | conf->batch_bio_dispatch = true; | |
6905 | rdev_for_each(rdev, mddev) { | |
6906 | if (test_bit(Journal, &rdev->flags)) | |
6907 | continue; | |
6908 | if (blk_queue_nonrot(bdev_get_queue(rdev->bdev))) { | |
6909 | conf->batch_bio_dispatch = false; | |
6910 | break; | |
6911 | } | |
6912 | } | |
6913 | ||
f5efd45a | 6914 | conf->bypass_threshold = BYPASS_THRESHOLD; |
d890fa2b | 6915 | conf->recovery_disabled = mddev->recovery_disabled - 1; |
91adb564 N |
6916 | |
6917 | conf->raid_disks = mddev->raid_disks; | |
6918 | if (mddev->reshape_position == MaxSector) | |
6919 | conf->previous_raid_disks = mddev->raid_disks; | |
6920 | else | |
f6705578 | 6921 | conf->previous_raid_disks = mddev->raid_disks - mddev->delta_disks; |
5e5e3e78 | 6922 | max_disks = max(conf->raid_disks, conf->previous_raid_disks); |
f6705578 | 6923 | |
5e5e3e78 | 6924 | conf->disks = kzalloc(max_disks * sizeof(struct disk_info), |
b55e6bfc | 6925 | GFP_KERNEL); |
d7bd398e | 6926 | |
b55e6bfc N |
6927 | if (!conf->disks) |
6928 | goto abort; | |
9ffae0cf | 6929 | |
d7bd398e SL |
6930 | for (i = 0; i < max_disks; i++) { |
6931 | conf->disks[i].extra_page = alloc_page(GFP_KERNEL); | |
6932 | if (!conf->disks[i].extra_page) | |
6933 | goto abort; | |
6934 | } | |
6935 | ||
dd7a8f5d N |
6936 | conf->bio_split = bioset_create(BIO_POOL_SIZE, 0); |
6937 | if (!conf->bio_split) | |
6938 | goto abort; | |
1da177e4 LT |
6939 | conf->mddev = mddev; |
6940 | ||
fccddba0 | 6941 | if ((conf->stripe_hashtbl = kzalloc(PAGE_SIZE, GFP_KERNEL)) == NULL) |
1da177e4 | 6942 | goto abort; |
1da177e4 | 6943 | |
566c09c5 SL |
6944 | /* We init hash_locks[0] separately to that it can be used |
6945 | * as the reference lock in the spin_lock_nest_lock() call | |
6946 | * in lock_all_device_hash_locks_irq in order to convince | |
6947 | * lockdep that we know what we are doing. | |
6948 | */ | |
6949 | spin_lock_init(conf->hash_locks); | |
6950 | for (i = 1; i < NR_STRIPE_HASH_LOCKS; i++) | |
6951 | spin_lock_init(conf->hash_locks + i); | |
6952 | ||
6953 | for (i = 0; i < NR_STRIPE_HASH_LOCKS; i++) | |
6954 | INIT_LIST_HEAD(conf->inactive_list + i); | |
6955 | ||
6956 | for (i = 0; i < NR_STRIPE_HASH_LOCKS; i++) | |
6957 | INIT_LIST_HEAD(conf->temp_inactive_list + i); | |
6958 | ||
1e6d690b SL |
6959 | atomic_set(&conf->r5c_cached_full_stripes, 0); |
6960 | INIT_LIST_HEAD(&conf->r5c_full_stripe_list); | |
6961 | atomic_set(&conf->r5c_cached_partial_stripes, 0); | |
6962 | INIT_LIST_HEAD(&conf->r5c_partial_stripe_list); | |
e33fbb9c SL |
6963 | atomic_set(&conf->r5c_flushing_full_stripes, 0); |
6964 | atomic_set(&conf->r5c_flushing_partial_stripes, 0); | |
1e6d690b | 6965 | |
36d1c647 | 6966 | conf->level = mddev->new_level; |
46d5b785 | 6967 | conf->chunk_sectors = mddev->new_chunk_sectors; |
36d1c647 DW |
6968 | if (raid5_alloc_percpu(conf) != 0) |
6969 | goto abort; | |
6970 | ||
0c55e022 | 6971 | pr_debug("raid456: run(%s) called.\n", mdname(mddev)); |
1da177e4 | 6972 | |
dafb20fa | 6973 | rdev_for_each(rdev, mddev) { |
1da177e4 | 6974 | raid_disk = rdev->raid_disk; |
5e5e3e78 | 6975 | if (raid_disk >= max_disks |
f2076e7d | 6976 | || raid_disk < 0 || test_bit(Journal, &rdev->flags)) |
1da177e4 LT |
6977 | continue; |
6978 | disk = conf->disks + raid_disk; | |
6979 | ||
17045f52 N |
6980 | if (test_bit(Replacement, &rdev->flags)) { |
6981 | if (disk->replacement) | |
6982 | goto abort; | |
6983 | disk->replacement = rdev; | |
6984 | } else { | |
6985 | if (disk->rdev) | |
6986 | goto abort; | |
6987 | disk->rdev = rdev; | |
6988 | } | |
1da177e4 | 6989 | |
b2d444d7 | 6990 | if (test_bit(In_sync, &rdev->flags)) { |
1da177e4 | 6991 | char b[BDEVNAME_SIZE]; |
cc6167b4 N |
6992 | pr_info("md/raid:%s: device %s operational as raid disk %d\n", |
6993 | mdname(mddev), bdevname(rdev->bdev, b), raid_disk); | |
d6b212f4 | 6994 | } else if (rdev->saved_raid_disk != raid_disk) |
8c2e870a NB |
6995 | /* Cannot rely on bitmap to complete recovery */ |
6996 | conf->fullsync = 1; | |
1da177e4 LT |
6997 | } |
6998 | ||
91adb564 | 6999 | conf->level = mddev->new_level; |
584acdd4 | 7000 | if (conf->level == 6) { |
16a53ecc | 7001 | conf->max_degraded = 2; |
584acdd4 MS |
7002 | if (raid6_call.xor_syndrome) |
7003 | conf->rmw_level = PARITY_ENABLE_RMW; | |
7004 | else | |
7005 | conf->rmw_level = PARITY_DISABLE_RMW; | |
7006 | } else { | |
16a53ecc | 7007 | conf->max_degraded = 1; |
584acdd4 MS |
7008 | conf->rmw_level = PARITY_ENABLE_RMW; |
7009 | } | |
91adb564 | 7010 | conf->algorithm = mddev->new_layout; |
fef9c61f | 7011 | conf->reshape_progress = mddev->reshape_position; |
e183eaed | 7012 | if (conf->reshape_progress != MaxSector) { |
09c9e5fa | 7013 | conf->prev_chunk_sectors = mddev->chunk_sectors; |
e183eaed | 7014 | conf->prev_algo = mddev->layout; |
5cac6bcb N |
7015 | } else { |
7016 | conf->prev_chunk_sectors = conf->chunk_sectors; | |
7017 | conf->prev_algo = conf->algorithm; | |
e183eaed | 7018 | } |
1da177e4 | 7019 | |
edbe83ab | 7020 | conf->min_nr_stripes = NR_STRIPES; |
ad5b0f76 SL |
7021 | if (mddev->reshape_position != MaxSector) { |
7022 | int stripes = max_t(int, | |
7023 | ((mddev->chunk_sectors << 9) / STRIPE_SIZE) * 4, | |
7024 | ((mddev->new_chunk_sectors << 9) / STRIPE_SIZE) * 4); | |
7025 | conf->min_nr_stripes = max(NR_STRIPES, stripes); | |
7026 | if (conf->min_nr_stripes != NR_STRIPES) | |
cc6167b4 | 7027 | pr_info("md/raid:%s: force stripe size %d for reshape\n", |
ad5b0f76 SL |
7028 | mdname(mddev), conf->min_nr_stripes); |
7029 | } | |
edbe83ab | 7030 | memory = conf->min_nr_stripes * (sizeof(struct stripe_head) + |
5e5e3e78 | 7031 | max_disks * ((sizeof(struct bio) + PAGE_SIZE))) / 1024; |
4bda556a | 7032 | atomic_set(&conf->empty_inactive_list_nr, NR_STRIPE_HASH_LOCKS); |
edbe83ab | 7033 | if (grow_stripes(conf, conf->min_nr_stripes)) { |
cc6167b4 N |
7034 | pr_warn("md/raid:%s: couldn't allocate %dkB for buffers\n", |
7035 | mdname(mddev), memory); | |
91adb564 N |
7036 | goto abort; |
7037 | } else | |
cc6167b4 | 7038 | pr_debug("md/raid:%s: allocated %dkB\n", mdname(mddev), memory); |
edbe83ab N |
7039 | /* |
7040 | * Losing a stripe head costs more than the time to refill it, | |
7041 | * it reduces the queue depth and so can hurt throughput. | |
7042 | * So set it rather large, scaled by number of devices. | |
7043 | */ | |
7044 | conf->shrinker.seeks = DEFAULT_SEEKS * conf->raid_disks * 4; | |
7045 | conf->shrinker.scan_objects = raid5_cache_scan; | |
7046 | conf->shrinker.count_objects = raid5_cache_count; | |
7047 | conf->shrinker.batch = 128; | |
7048 | conf->shrinker.flags = 0; | |
6a0f53ff | 7049 | if (register_shrinker(&conf->shrinker)) { |
cc6167b4 N |
7050 | pr_warn("md/raid:%s: couldn't register shrinker.\n", |
7051 | mdname(mddev)); | |
6a0f53ff CY |
7052 | goto abort; |
7053 | } | |
1da177e4 | 7054 | |
0232605d N |
7055 | sprintf(pers_name, "raid%d", mddev->new_level); |
7056 | conf->thread = md_register_thread(raid5d, mddev, pers_name); | |
91adb564 | 7057 | if (!conf->thread) { |
cc6167b4 N |
7058 | pr_warn("md/raid:%s: couldn't allocate thread.\n", |
7059 | mdname(mddev)); | |
16a53ecc N |
7060 | goto abort; |
7061 | } | |
91adb564 N |
7062 | |
7063 | return conf; | |
7064 | ||
7065 | abort: | |
7066 | if (conf) { | |
95fc17aa | 7067 | free_conf(conf); |
91adb564 N |
7068 | return ERR_PTR(-EIO); |
7069 | } else | |
7070 | return ERR_PTR(-ENOMEM); | |
7071 | } | |
7072 | ||
c148ffdc N |
7073 | static int only_parity(int raid_disk, int algo, int raid_disks, int max_degraded) |
7074 | { | |
7075 | switch (algo) { | |
7076 | case ALGORITHM_PARITY_0: | |
7077 | if (raid_disk < max_degraded) | |
7078 | return 1; | |
7079 | break; | |
7080 | case ALGORITHM_PARITY_N: | |
7081 | if (raid_disk >= raid_disks - max_degraded) | |
7082 | return 1; | |
7083 | break; | |
7084 | case ALGORITHM_PARITY_0_6: | |
f72ffdd6 | 7085 | if (raid_disk == 0 || |
c148ffdc N |
7086 | raid_disk == raid_disks - 1) |
7087 | return 1; | |
7088 | break; | |
7089 | case ALGORITHM_LEFT_ASYMMETRIC_6: | |
7090 | case ALGORITHM_RIGHT_ASYMMETRIC_6: | |
7091 | case ALGORITHM_LEFT_SYMMETRIC_6: | |
7092 | case ALGORITHM_RIGHT_SYMMETRIC_6: | |
7093 | if (raid_disk == raid_disks - 1) | |
7094 | return 1; | |
7095 | } | |
7096 | return 0; | |
7097 | } | |
7098 | ||
849674e4 | 7099 | static int raid5_run(struct mddev *mddev) |
91adb564 | 7100 | { |
d1688a6d | 7101 | struct r5conf *conf; |
9f7c2220 | 7102 | int working_disks = 0; |
c148ffdc | 7103 | int dirty_parity_disks = 0; |
3cb03002 | 7104 | struct md_rdev *rdev; |
713cf5a6 | 7105 | struct md_rdev *journal_dev = NULL; |
c148ffdc | 7106 | sector_t reshape_offset = 0; |
17045f52 | 7107 | int i; |
b5254dd5 N |
7108 | long long min_offset_diff = 0; |
7109 | int first = 1; | |
91adb564 | 7110 | |
8c6ac868 | 7111 | if (mddev->recovery_cp != MaxSector) |
cc6167b4 N |
7112 | pr_notice("md/raid:%s: not clean -- starting background reconstruction\n", |
7113 | mdname(mddev)); | |
b5254dd5 N |
7114 | |
7115 | rdev_for_each(rdev, mddev) { | |
7116 | long long diff; | |
713cf5a6 | 7117 | |
f2076e7d | 7118 | if (test_bit(Journal, &rdev->flags)) { |
713cf5a6 | 7119 | journal_dev = rdev; |
f2076e7d SL |
7120 | continue; |
7121 | } | |
b5254dd5 N |
7122 | if (rdev->raid_disk < 0) |
7123 | continue; | |
7124 | diff = (rdev->new_data_offset - rdev->data_offset); | |
7125 | if (first) { | |
7126 | min_offset_diff = diff; | |
7127 | first = 0; | |
7128 | } else if (mddev->reshape_backwards && | |
7129 | diff < min_offset_diff) | |
7130 | min_offset_diff = diff; | |
7131 | else if (!mddev->reshape_backwards && | |
7132 | diff > min_offset_diff) | |
7133 | min_offset_diff = diff; | |
7134 | } | |
7135 | ||
91adb564 N |
7136 | if (mddev->reshape_position != MaxSector) { |
7137 | /* Check that we can continue the reshape. | |
b5254dd5 N |
7138 | * Difficulties arise if the stripe we would write to |
7139 | * next is at or after the stripe we would read from next. | |
7140 | * For a reshape that changes the number of devices, this | |
7141 | * is only possible for a very short time, and mdadm makes | |
7142 | * sure that time appears to have past before assembling | |
7143 | * the array. So we fail if that time hasn't passed. | |
7144 | * For a reshape that keeps the number of devices the same | |
7145 | * mdadm must be monitoring the reshape can keeping the | |
7146 | * critical areas read-only and backed up. It will start | |
7147 | * the array in read-only mode, so we check for that. | |
91adb564 N |
7148 | */ |
7149 | sector_t here_new, here_old; | |
7150 | int old_disks; | |
18b00334 | 7151 | int max_degraded = (mddev->level == 6 ? 2 : 1); |
05256d98 N |
7152 | int chunk_sectors; |
7153 | int new_data_disks; | |
91adb564 | 7154 | |
713cf5a6 | 7155 | if (journal_dev) { |
cc6167b4 N |
7156 | pr_warn("md/raid:%s: don't support reshape with journal - aborting.\n", |
7157 | mdname(mddev)); | |
713cf5a6 SL |
7158 | return -EINVAL; |
7159 | } | |
7160 | ||
88ce4930 | 7161 | if (mddev->new_level != mddev->level) { |
cc6167b4 N |
7162 | pr_warn("md/raid:%s: unsupported reshape required - aborting.\n", |
7163 | mdname(mddev)); | |
91adb564 N |
7164 | return -EINVAL; |
7165 | } | |
91adb564 N |
7166 | old_disks = mddev->raid_disks - mddev->delta_disks; |
7167 | /* reshape_position must be on a new-stripe boundary, and one | |
7168 | * further up in new geometry must map after here in old | |
7169 | * geometry. | |
05256d98 N |
7170 | * If the chunk sizes are different, then as we perform reshape |
7171 | * in units of the largest of the two, reshape_position needs | |
7172 | * be a multiple of the largest chunk size times new data disks. | |
91adb564 N |
7173 | */ |
7174 | here_new = mddev->reshape_position; | |
05256d98 N |
7175 | chunk_sectors = max(mddev->chunk_sectors, mddev->new_chunk_sectors); |
7176 | new_data_disks = mddev->raid_disks - max_degraded; | |
7177 | if (sector_div(here_new, chunk_sectors * new_data_disks)) { | |
cc6167b4 N |
7178 | pr_warn("md/raid:%s: reshape_position not on a stripe boundary\n", |
7179 | mdname(mddev)); | |
91adb564 N |
7180 | return -EINVAL; |
7181 | } | |
05256d98 | 7182 | reshape_offset = here_new * chunk_sectors; |
91adb564 N |
7183 | /* here_new is the stripe we will write to */ |
7184 | here_old = mddev->reshape_position; | |
05256d98 | 7185 | sector_div(here_old, chunk_sectors * (old_disks-max_degraded)); |
91adb564 N |
7186 | /* here_old is the first stripe that we might need to read |
7187 | * from */ | |
67ac6011 N |
7188 | if (mddev->delta_disks == 0) { |
7189 | /* We cannot be sure it is safe to start an in-place | |
b5254dd5 | 7190 | * reshape. It is only safe if user-space is monitoring |
67ac6011 N |
7191 | * and taking constant backups. |
7192 | * mdadm always starts a situation like this in | |
7193 | * readonly mode so it can take control before | |
7194 | * allowing any writes. So just check for that. | |
7195 | */ | |
b5254dd5 N |
7196 | if (abs(min_offset_diff) >= mddev->chunk_sectors && |
7197 | abs(min_offset_diff) >= mddev->new_chunk_sectors) | |
7198 | /* not really in-place - so OK */; | |
7199 | else if (mddev->ro == 0) { | |
cc6167b4 N |
7200 | pr_warn("md/raid:%s: in-place reshape must be started in read-only mode - aborting\n", |
7201 | mdname(mddev)); | |
67ac6011 N |
7202 | return -EINVAL; |
7203 | } | |
2c810cdd | 7204 | } else if (mddev->reshape_backwards |
05256d98 N |
7205 | ? (here_new * chunk_sectors + min_offset_diff <= |
7206 | here_old * chunk_sectors) | |
7207 | : (here_new * chunk_sectors >= | |
7208 | here_old * chunk_sectors + (-min_offset_diff))) { | |
91adb564 | 7209 | /* Reading from the same stripe as writing to - bad */ |
cc6167b4 N |
7210 | pr_warn("md/raid:%s: reshape_position too early for auto-recovery - aborting.\n", |
7211 | mdname(mddev)); | |
91adb564 N |
7212 | return -EINVAL; |
7213 | } | |
cc6167b4 | 7214 | pr_debug("md/raid:%s: reshape will continue\n", mdname(mddev)); |
91adb564 N |
7215 | /* OK, we should be able to continue; */ |
7216 | } else { | |
7217 | BUG_ON(mddev->level != mddev->new_level); | |
7218 | BUG_ON(mddev->layout != mddev->new_layout); | |
664e7c41 | 7219 | BUG_ON(mddev->chunk_sectors != mddev->new_chunk_sectors); |
91adb564 | 7220 | BUG_ON(mddev->delta_disks != 0); |
1da177e4 | 7221 | } |
91adb564 | 7222 | |
3418d036 AP |
7223 | if (test_bit(MD_HAS_JOURNAL, &mddev->flags) && |
7224 | test_bit(MD_HAS_PPL, &mddev->flags)) { | |
7225 | pr_warn("md/raid:%s: using journal device and PPL not allowed - disabling PPL\n", | |
7226 | mdname(mddev)); | |
7227 | clear_bit(MD_HAS_PPL, &mddev->flags); | |
7228 | } | |
7229 | ||
245f46c2 N |
7230 | if (mddev->private == NULL) |
7231 | conf = setup_conf(mddev); | |
7232 | else | |
7233 | conf = mddev->private; | |
7234 | ||
91adb564 N |
7235 | if (IS_ERR(conf)) |
7236 | return PTR_ERR(conf); | |
7237 | ||
486b0f7b SL |
7238 | if (test_bit(MD_HAS_JOURNAL, &mddev->flags)) { |
7239 | if (!journal_dev) { | |
cc6167b4 N |
7240 | pr_warn("md/raid:%s: journal disk is missing, force array readonly\n", |
7241 | mdname(mddev)); | |
486b0f7b SL |
7242 | mddev->ro = 1; |
7243 | set_disk_ro(mddev->gendisk, 1); | |
7244 | } else if (mddev->recovery_cp == MaxSector) | |
7245 | set_bit(MD_JOURNAL_CLEAN, &mddev->flags); | |
7dde2ad3 SL |
7246 | } |
7247 | ||
b5254dd5 | 7248 | conf->min_offset_diff = min_offset_diff; |
91adb564 N |
7249 | mddev->thread = conf->thread; |
7250 | conf->thread = NULL; | |
7251 | mddev->private = conf; | |
7252 | ||
17045f52 N |
7253 | for (i = 0; i < conf->raid_disks && conf->previous_raid_disks; |
7254 | i++) { | |
7255 | rdev = conf->disks[i].rdev; | |
7256 | if (!rdev && conf->disks[i].replacement) { | |
7257 | /* The replacement is all we have yet */ | |
7258 | rdev = conf->disks[i].replacement; | |
7259 | conf->disks[i].replacement = NULL; | |
7260 | clear_bit(Replacement, &rdev->flags); | |
7261 | conf->disks[i].rdev = rdev; | |
7262 | } | |
7263 | if (!rdev) | |
c148ffdc | 7264 | continue; |
17045f52 N |
7265 | if (conf->disks[i].replacement && |
7266 | conf->reshape_progress != MaxSector) { | |
7267 | /* replacements and reshape simply do not mix. */ | |
cc6167b4 | 7268 | pr_warn("md: cannot handle concurrent replacement and reshape.\n"); |
17045f52 N |
7269 | goto abort; |
7270 | } | |
2f115882 | 7271 | if (test_bit(In_sync, &rdev->flags)) { |
91adb564 | 7272 | working_disks++; |
2f115882 N |
7273 | continue; |
7274 | } | |
c148ffdc N |
7275 | /* This disc is not fully in-sync. However if it |
7276 | * just stored parity (beyond the recovery_offset), | |
7277 | * when we don't need to be concerned about the | |
7278 | * array being dirty. | |
7279 | * When reshape goes 'backwards', we never have | |
7280 | * partially completed devices, so we only need | |
7281 | * to worry about reshape going forwards. | |
7282 | */ | |
7283 | /* Hack because v0.91 doesn't store recovery_offset properly. */ | |
7284 | if (mddev->major_version == 0 && | |
7285 | mddev->minor_version > 90) | |
7286 | rdev->recovery_offset = reshape_offset; | |
5026d7a9 | 7287 | |
c148ffdc N |
7288 | if (rdev->recovery_offset < reshape_offset) { |
7289 | /* We need to check old and new layout */ | |
7290 | if (!only_parity(rdev->raid_disk, | |
7291 | conf->algorithm, | |
7292 | conf->raid_disks, | |
7293 | conf->max_degraded)) | |
7294 | continue; | |
7295 | } | |
7296 | if (!only_parity(rdev->raid_disk, | |
7297 | conf->prev_algo, | |
7298 | conf->previous_raid_disks, | |
7299 | conf->max_degraded)) | |
7300 | continue; | |
7301 | dirty_parity_disks++; | |
7302 | } | |
91adb564 | 7303 | |
17045f52 N |
7304 | /* |
7305 | * 0 for a fully functional array, 1 or 2 for a degraded array. | |
7306 | */ | |
2e38a37f | 7307 | mddev->degraded = raid5_calc_degraded(conf); |
91adb564 | 7308 | |
674806d6 | 7309 | if (has_failed(conf)) { |
cc6167b4 | 7310 | pr_crit("md/raid:%s: not enough operational devices (%d/%d failed)\n", |
02c2de8c | 7311 | mdname(mddev), mddev->degraded, conf->raid_disks); |
1da177e4 LT |
7312 | goto abort; |
7313 | } | |
7314 | ||
91adb564 | 7315 | /* device size must be a multiple of chunk size */ |
9d8f0363 | 7316 | mddev->dev_sectors &= ~(mddev->chunk_sectors - 1); |
91adb564 N |
7317 | mddev->resync_max_sectors = mddev->dev_sectors; |
7318 | ||
c148ffdc | 7319 | if (mddev->degraded > dirty_parity_disks && |
1da177e4 | 7320 | mddev->recovery_cp != MaxSector) { |
4536bf9b AP |
7321 | if (test_bit(MD_HAS_PPL, &mddev->flags)) |
7322 | pr_crit("md/raid:%s: starting dirty degraded array with PPL.\n", | |
7323 | mdname(mddev)); | |
7324 | else if (mddev->ok_start_degraded) | |
cc6167b4 N |
7325 | pr_crit("md/raid:%s: starting dirty degraded array - data corruption possible.\n", |
7326 | mdname(mddev)); | |
6ff8d8ec | 7327 | else { |
cc6167b4 N |
7328 | pr_crit("md/raid:%s: cannot start dirty degraded array.\n", |
7329 | mdname(mddev)); | |
6ff8d8ec N |
7330 | goto abort; |
7331 | } | |
1da177e4 LT |
7332 | } |
7333 | ||
cc6167b4 N |
7334 | pr_info("md/raid:%s: raid level %d active with %d out of %d devices, algorithm %d\n", |
7335 | mdname(mddev), conf->level, | |
7336 | mddev->raid_disks-mddev->degraded, mddev->raid_disks, | |
7337 | mddev->new_layout); | |
1da177e4 LT |
7338 | |
7339 | print_raid5_conf(conf); | |
7340 | ||
fef9c61f | 7341 | if (conf->reshape_progress != MaxSector) { |
fef9c61f | 7342 | conf->reshape_safe = conf->reshape_progress; |
f6705578 N |
7343 | atomic_set(&conf->reshape_stripes, 0); |
7344 | clear_bit(MD_RECOVERY_SYNC, &mddev->recovery); | |
7345 | clear_bit(MD_RECOVERY_CHECK, &mddev->recovery); | |
7346 | set_bit(MD_RECOVERY_RESHAPE, &mddev->recovery); | |
7347 | set_bit(MD_RECOVERY_RUNNING, &mddev->recovery); | |
7348 | mddev->sync_thread = md_register_thread(md_do_sync, mddev, | |
0da3c619 | 7349 | "reshape"); |
f6705578 N |
7350 | } |
7351 | ||
1da177e4 | 7352 | /* Ok, everything is just fine now */ |
a64c876f N |
7353 | if (mddev->to_remove == &raid5_attrs_group) |
7354 | mddev->to_remove = NULL; | |
00bcb4ac N |
7355 | else if (mddev->kobj.sd && |
7356 | sysfs_create_group(&mddev->kobj, &raid5_attrs_group)) | |
cc6167b4 N |
7357 | pr_warn("raid5: failed to create sysfs attributes for %s\n", |
7358 | mdname(mddev)); | |
4a5add49 | 7359 | md_set_array_sectors(mddev, raid5_size(mddev, 0, 0)); |
7a5febe9 | 7360 | |
4a5add49 | 7361 | if (mddev->queue) { |
9f7c2220 | 7362 | int chunk_size; |
4a5add49 N |
7363 | /* read-ahead size must cover two whole stripes, which |
7364 | * is 2 * (datadisks) * chunksize where 'n' is the | |
7365 | * number of raid devices | |
7366 | */ | |
7367 | int data_disks = conf->previous_raid_disks - conf->max_degraded; | |
7368 | int stripe = data_disks * | |
7369 | ((mddev->chunk_sectors << 9) / PAGE_SIZE); | |
dc3b17cc JK |
7370 | if (mddev->queue->backing_dev_info->ra_pages < 2 * stripe) |
7371 | mddev->queue->backing_dev_info->ra_pages = 2 * stripe; | |
91adb564 | 7372 | |
9f7c2220 N |
7373 | chunk_size = mddev->chunk_sectors << 9; |
7374 | blk_queue_io_min(mddev->queue, chunk_size); | |
7375 | blk_queue_io_opt(mddev->queue, chunk_size * | |
7376 | (conf->raid_disks - conf->max_degraded)); | |
c78afc62 | 7377 | mddev->queue->limits.raid_partial_stripes_expensive = 1; |
620125f2 SL |
7378 | /* |
7379 | * We can only discard a whole stripe. It doesn't make sense to | |
7380 | * discard data disk but write parity disk | |
7381 | */ | |
7382 | stripe = stripe * PAGE_SIZE; | |
4ac6875e N |
7383 | /* Round up to power of 2, as discard handling |
7384 | * currently assumes that */ | |
7385 | while ((stripe-1) & stripe) | |
7386 | stripe = (stripe | (stripe-1)) + 1; | |
620125f2 SL |
7387 | mddev->queue->limits.discard_alignment = stripe; |
7388 | mddev->queue->limits.discard_granularity = stripe; | |
e8d7c332 | 7389 | |
5026d7a9 | 7390 | blk_queue_max_write_same_sectors(mddev->queue, 0); |
3deff1a7 | 7391 | blk_queue_max_write_zeroes_sectors(mddev->queue, 0); |
5026d7a9 | 7392 | |
05616be5 | 7393 | rdev_for_each(rdev, mddev) { |
9f7c2220 N |
7394 | disk_stack_limits(mddev->gendisk, rdev->bdev, |
7395 | rdev->data_offset << 9); | |
05616be5 N |
7396 | disk_stack_limits(mddev->gendisk, rdev->bdev, |
7397 | rdev->new_data_offset << 9); | |
7398 | } | |
620125f2 | 7399 | |
48920ff2 CH |
7400 | /* |
7401 | * zeroing is required, otherwise data | |
7402 | * could be lost. Consider a scenario: discard a stripe | |
7403 | * (the stripe could be inconsistent if | |
7404 | * discard_zeroes_data is 0); write one disk of the | |
7405 | * stripe (the stripe could be inconsistent again | |
7406 | * depending on which disks are used to calculate | |
7407 | * parity); the disk is broken; The stripe data of this | |
7408 | * disk is lost. | |
7409 | * | |
7410 | * We only allow DISCARD if the sysadmin has confirmed that | |
7411 | * only safe devices are in use by setting a module parameter. | |
7412 | * A better idea might be to turn DISCARD into WRITE_ZEROES | |
7413 | * requests, as that is required to be safe. | |
7414 | */ | |
7415 | if (devices_handle_discard_safely && | |
e7597e69 JS |
7416 | mddev->queue->limits.max_discard_sectors >= (stripe >> 9) && |
7417 | mddev->queue->limits.discard_granularity >= stripe) | |
620125f2 SL |
7418 | queue_flag_set_unlocked(QUEUE_FLAG_DISCARD, |
7419 | mddev->queue); | |
7420 | else | |
7421 | queue_flag_clear_unlocked(QUEUE_FLAG_DISCARD, | |
7422 | mddev->queue); | |
1dffdddd SL |
7423 | |
7424 | blk_queue_max_hw_sectors(mddev->queue, UINT_MAX); | |
9f7c2220 | 7425 | } |
23032a0e | 7426 | |
845b9e22 | 7427 | if (log_init(conf, journal_dev, raid5_has_ppl(conf))) |
ff875738 | 7428 | goto abort; |
5c7e81c3 | 7429 | |
1da177e4 LT |
7430 | return 0; |
7431 | abort: | |
01f96c0a | 7432 | md_unregister_thread(&mddev->thread); |
e4f869d9 N |
7433 | print_raid5_conf(conf); |
7434 | free_conf(conf); | |
1da177e4 | 7435 | mddev->private = NULL; |
cc6167b4 | 7436 | pr_warn("md/raid:%s: failed to run raid set.\n", mdname(mddev)); |
1da177e4 LT |
7437 | return -EIO; |
7438 | } | |
7439 | ||
afa0f557 | 7440 | static void raid5_free(struct mddev *mddev, void *priv) |
1da177e4 | 7441 | { |
afa0f557 | 7442 | struct r5conf *conf = priv; |
1da177e4 | 7443 | |
95fc17aa | 7444 | free_conf(conf); |
a64c876f | 7445 | mddev->to_remove = &raid5_attrs_group; |
1da177e4 LT |
7446 | } |
7447 | ||
849674e4 | 7448 | static void raid5_status(struct seq_file *seq, struct mddev *mddev) |
1da177e4 | 7449 | { |
d1688a6d | 7450 | struct r5conf *conf = mddev->private; |
1da177e4 LT |
7451 | int i; |
7452 | ||
9d8f0363 | 7453 | seq_printf(seq, " level %d, %dk chunk, algorithm %d", mddev->level, |
3cb5edf4 | 7454 | conf->chunk_sectors / 2, mddev->layout); |
02c2de8c | 7455 | seq_printf (seq, " [%d/%d] [", conf->raid_disks, conf->raid_disks - mddev->degraded); |
5fd13351 N |
7456 | rcu_read_lock(); |
7457 | for (i = 0; i < conf->raid_disks; i++) { | |
7458 | struct md_rdev *rdev = rcu_dereference(conf->disks[i].rdev); | |
7459 | seq_printf (seq, "%s", rdev && test_bit(In_sync, &rdev->flags) ? "U" : "_"); | |
7460 | } | |
7461 | rcu_read_unlock(); | |
1da177e4 | 7462 | seq_printf (seq, "]"); |
1da177e4 LT |
7463 | } |
7464 | ||
d1688a6d | 7465 | static void print_raid5_conf (struct r5conf *conf) |
1da177e4 LT |
7466 | { |
7467 | int i; | |
7468 | struct disk_info *tmp; | |
7469 | ||
cc6167b4 | 7470 | pr_debug("RAID conf printout:\n"); |
1da177e4 | 7471 | if (!conf) { |
cc6167b4 | 7472 | pr_debug("(conf==NULL)\n"); |
1da177e4 LT |
7473 | return; |
7474 | } | |
cc6167b4 | 7475 | pr_debug(" --- level:%d rd:%d wd:%d\n", conf->level, |
0c55e022 N |
7476 | conf->raid_disks, |
7477 | conf->raid_disks - conf->mddev->degraded); | |
1da177e4 LT |
7478 | |
7479 | for (i = 0; i < conf->raid_disks; i++) { | |
7480 | char b[BDEVNAME_SIZE]; | |
7481 | tmp = conf->disks + i; | |
7482 | if (tmp->rdev) | |
cc6167b4 | 7483 | pr_debug(" disk %d, o:%d, dev:%s\n", |
0c55e022 N |
7484 | i, !test_bit(Faulty, &tmp->rdev->flags), |
7485 | bdevname(tmp->rdev->bdev, b)); | |
1da177e4 LT |
7486 | } |
7487 | } | |
7488 | ||
fd01b88c | 7489 | static int raid5_spare_active(struct mddev *mddev) |
1da177e4 LT |
7490 | { |
7491 | int i; | |
d1688a6d | 7492 | struct r5conf *conf = mddev->private; |
1da177e4 | 7493 | struct disk_info *tmp; |
6b965620 N |
7494 | int count = 0; |
7495 | unsigned long flags; | |
1da177e4 LT |
7496 | |
7497 | for (i = 0; i < conf->raid_disks; i++) { | |
7498 | tmp = conf->disks + i; | |
dd054fce N |
7499 | if (tmp->replacement |
7500 | && tmp->replacement->recovery_offset == MaxSector | |
7501 | && !test_bit(Faulty, &tmp->replacement->flags) | |
7502 | && !test_and_set_bit(In_sync, &tmp->replacement->flags)) { | |
7503 | /* Replacement has just become active. */ | |
7504 | if (!tmp->rdev | |
7505 | || !test_and_clear_bit(In_sync, &tmp->rdev->flags)) | |
7506 | count++; | |
7507 | if (tmp->rdev) { | |
7508 | /* Replaced device not technically faulty, | |
7509 | * but we need to be sure it gets removed | |
7510 | * and never re-added. | |
7511 | */ | |
7512 | set_bit(Faulty, &tmp->rdev->flags); | |
7513 | sysfs_notify_dirent_safe( | |
7514 | tmp->rdev->sysfs_state); | |
7515 | } | |
7516 | sysfs_notify_dirent_safe(tmp->replacement->sysfs_state); | |
7517 | } else if (tmp->rdev | |
70fffd0b | 7518 | && tmp->rdev->recovery_offset == MaxSector |
b2d444d7 | 7519 | && !test_bit(Faulty, &tmp->rdev->flags) |
c04be0aa | 7520 | && !test_and_set_bit(In_sync, &tmp->rdev->flags)) { |
6b965620 | 7521 | count++; |
43c73ca4 | 7522 | sysfs_notify_dirent_safe(tmp->rdev->sysfs_state); |
1da177e4 LT |
7523 | } |
7524 | } | |
6b965620 | 7525 | spin_lock_irqsave(&conf->device_lock, flags); |
2e38a37f | 7526 | mddev->degraded = raid5_calc_degraded(conf); |
6b965620 | 7527 | spin_unlock_irqrestore(&conf->device_lock, flags); |
1da177e4 | 7528 | print_raid5_conf(conf); |
6b965620 | 7529 | return count; |
1da177e4 LT |
7530 | } |
7531 | ||
b8321b68 | 7532 | static int raid5_remove_disk(struct mddev *mddev, struct md_rdev *rdev) |
1da177e4 | 7533 | { |
d1688a6d | 7534 | struct r5conf *conf = mddev->private; |
1da177e4 | 7535 | int err = 0; |
b8321b68 | 7536 | int number = rdev->raid_disk; |
657e3e4d | 7537 | struct md_rdev **rdevp; |
1da177e4 LT |
7538 | struct disk_info *p = conf->disks + number; |
7539 | ||
7540 | print_raid5_conf(conf); | |
f6b6ec5c | 7541 | if (test_bit(Journal, &rdev->flags) && conf->log) { |
c2bb6242 | 7542 | /* |
f6b6ec5c SL |
7543 | * we can't wait pending write here, as this is called in |
7544 | * raid5d, wait will deadlock. | |
84dd97a6 N |
7545 | * neilb: there is no locking about new writes here, |
7546 | * so this cannot be safe. | |
c2bb6242 | 7547 | */ |
70d466f7 SL |
7548 | if (atomic_read(&conf->active_stripes) || |
7549 | atomic_read(&conf->r5c_cached_full_stripes) || | |
7550 | atomic_read(&conf->r5c_cached_partial_stripes)) { | |
f6b6ec5c | 7551 | return -EBUSY; |
84dd97a6 | 7552 | } |
ff875738 | 7553 | log_exit(conf); |
f6b6ec5c | 7554 | return 0; |
c2bb6242 | 7555 | } |
657e3e4d N |
7556 | if (rdev == p->rdev) |
7557 | rdevp = &p->rdev; | |
7558 | else if (rdev == p->replacement) | |
7559 | rdevp = &p->replacement; | |
7560 | else | |
7561 | return 0; | |
7562 | ||
7563 | if (number >= conf->raid_disks && | |
7564 | conf->reshape_progress == MaxSector) | |
7565 | clear_bit(In_sync, &rdev->flags); | |
7566 | ||
7567 | if (test_bit(In_sync, &rdev->flags) || | |
7568 | atomic_read(&rdev->nr_pending)) { | |
7569 | err = -EBUSY; | |
7570 | goto abort; | |
7571 | } | |
7572 | /* Only remove non-faulty devices if recovery | |
7573 | * isn't possible. | |
7574 | */ | |
7575 | if (!test_bit(Faulty, &rdev->flags) && | |
7576 | mddev->recovery_disabled != conf->recovery_disabled && | |
7577 | !has_failed(conf) && | |
dd054fce | 7578 | (!p->replacement || p->replacement == rdev) && |
657e3e4d N |
7579 | number < conf->raid_disks) { |
7580 | err = -EBUSY; | |
7581 | goto abort; | |
7582 | } | |
7583 | *rdevp = NULL; | |
d787be40 N |
7584 | if (!test_bit(RemoveSynchronized, &rdev->flags)) { |
7585 | synchronize_rcu(); | |
7586 | if (atomic_read(&rdev->nr_pending)) { | |
7587 | /* lost the race, try later */ | |
7588 | err = -EBUSY; | |
7589 | *rdevp = rdev; | |
7590 | } | |
7591 | } | |
6358c239 AP |
7592 | if (!err) { |
7593 | err = log_modify(conf, rdev, false); | |
7594 | if (err) | |
7595 | goto abort; | |
7596 | } | |
d787be40 | 7597 | if (p->replacement) { |
dd054fce N |
7598 | /* We must have just cleared 'rdev' */ |
7599 | p->rdev = p->replacement; | |
7600 | clear_bit(Replacement, &p->replacement->flags); | |
7601 | smp_mb(); /* Make sure other CPUs may see both as identical | |
7602 | * but will never see neither - if they are careful | |
7603 | */ | |
7604 | p->replacement = NULL; | |
6358c239 AP |
7605 | |
7606 | if (!err) | |
7607 | err = log_modify(conf, p->rdev, true); | |
e5bc9c3c GJ |
7608 | } |
7609 | ||
7610 | clear_bit(WantReplacement, &rdev->flags); | |
1da177e4 LT |
7611 | abort: |
7612 | ||
7613 | print_raid5_conf(conf); | |
7614 | return err; | |
7615 | } | |
7616 | ||
fd01b88c | 7617 | static int raid5_add_disk(struct mddev *mddev, struct md_rdev *rdev) |
1da177e4 | 7618 | { |
d1688a6d | 7619 | struct r5conf *conf = mddev->private; |
199050ea | 7620 | int err = -EEXIST; |
1da177e4 LT |
7621 | int disk; |
7622 | struct disk_info *p; | |
6c2fce2e NB |
7623 | int first = 0; |
7624 | int last = conf->raid_disks - 1; | |
1da177e4 | 7625 | |
f6b6ec5c | 7626 | if (test_bit(Journal, &rdev->flags)) { |
f6b6ec5c SL |
7627 | if (conf->log) |
7628 | return -EBUSY; | |
7629 | ||
7630 | rdev->raid_disk = 0; | |
7631 | /* | |
7632 | * The array is in readonly mode if journal is missing, so no | |
7633 | * write requests running. We should be safe | |
7634 | */ | |
845b9e22 | 7635 | log_init(conf, rdev, false); |
f6b6ec5c SL |
7636 | return 0; |
7637 | } | |
7f0da59b N |
7638 | if (mddev->recovery_disabled == conf->recovery_disabled) |
7639 | return -EBUSY; | |
7640 | ||
dc10c643 | 7641 | if (rdev->saved_raid_disk < 0 && has_failed(conf)) |
1da177e4 | 7642 | /* no point adding a device */ |
199050ea | 7643 | return -EINVAL; |
1da177e4 | 7644 | |
6c2fce2e NB |
7645 | if (rdev->raid_disk >= 0) |
7646 | first = last = rdev->raid_disk; | |
1da177e4 LT |
7647 | |
7648 | /* | |
16a53ecc N |
7649 | * find the disk ... but prefer rdev->saved_raid_disk |
7650 | * if possible. | |
1da177e4 | 7651 | */ |
16a53ecc | 7652 | if (rdev->saved_raid_disk >= 0 && |
6c2fce2e | 7653 | rdev->saved_raid_disk >= first && |
16a53ecc | 7654 | conf->disks[rdev->saved_raid_disk].rdev == NULL) |
5cfb22a1 N |
7655 | first = rdev->saved_raid_disk; |
7656 | ||
7657 | for (disk = first; disk <= last; disk++) { | |
7bfec5f3 N |
7658 | p = conf->disks + disk; |
7659 | if (p->rdev == NULL) { | |
b2d444d7 | 7660 | clear_bit(In_sync, &rdev->flags); |
1da177e4 | 7661 | rdev->raid_disk = disk; |
72626685 N |
7662 | if (rdev->saved_raid_disk != disk) |
7663 | conf->fullsync = 1; | |
d6065f7b | 7664 | rcu_assign_pointer(p->rdev, rdev); |
6358c239 AP |
7665 | |
7666 | err = log_modify(conf, rdev, true); | |
7667 | ||
5cfb22a1 | 7668 | goto out; |
1da177e4 | 7669 | } |
5cfb22a1 N |
7670 | } |
7671 | for (disk = first; disk <= last; disk++) { | |
7672 | p = conf->disks + disk; | |
7bfec5f3 N |
7673 | if (test_bit(WantReplacement, &p->rdev->flags) && |
7674 | p->replacement == NULL) { | |
7675 | clear_bit(In_sync, &rdev->flags); | |
7676 | set_bit(Replacement, &rdev->flags); | |
7677 | rdev->raid_disk = disk; | |
7678 | err = 0; | |
7679 | conf->fullsync = 1; | |
7680 | rcu_assign_pointer(p->replacement, rdev); | |
7681 | break; | |
7682 | } | |
7683 | } | |
5cfb22a1 | 7684 | out: |
1da177e4 | 7685 | print_raid5_conf(conf); |
199050ea | 7686 | return err; |
1da177e4 LT |
7687 | } |
7688 | ||
fd01b88c | 7689 | static int raid5_resize(struct mddev *mddev, sector_t sectors) |
1da177e4 LT |
7690 | { |
7691 | /* no resync is happening, and there is enough space | |
7692 | * on all devices, so we can resize. | |
7693 | * We need to make sure resync covers any new space. | |
7694 | * If the array is shrinking we should possibly wait until | |
7695 | * any io in the removed space completes, but it hardly seems | |
7696 | * worth it. | |
7697 | */ | |
a4a6125a | 7698 | sector_t newsize; |
3cb5edf4 N |
7699 | struct r5conf *conf = mddev->private; |
7700 | ||
3418d036 | 7701 | if (conf->log || raid5_has_ppl(conf)) |
713cf5a6 | 7702 | return -EINVAL; |
3cb5edf4 | 7703 | sectors &= ~((sector_t)conf->chunk_sectors - 1); |
a4a6125a N |
7704 | newsize = raid5_size(mddev, sectors, mddev->raid_disks); |
7705 | if (mddev->external_size && | |
7706 | mddev->array_sectors > newsize) | |
b522adcd | 7707 | return -EINVAL; |
a4a6125a N |
7708 | if (mddev->bitmap) { |
7709 | int ret = bitmap_resize(mddev->bitmap, sectors, 0, 0); | |
7710 | if (ret) | |
7711 | return ret; | |
7712 | } | |
7713 | md_set_array_sectors(mddev, newsize); | |
b098636c N |
7714 | if (sectors > mddev->dev_sectors && |
7715 | mddev->recovery_cp > mddev->dev_sectors) { | |
58c0fed4 | 7716 | mddev->recovery_cp = mddev->dev_sectors; |
1da177e4 LT |
7717 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
7718 | } | |
58c0fed4 | 7719 | mddev->dev_sectors = sectors; |
4b5c7ae8 | 7720 | mddev->resync_max_sectors = sectors; |
1da177e4 LT |
7721 | return 0; |
7722 | } | |
7723 | ||
fd01b88c | 7724 | static int check_stripe_cache(struct mddev *mddev) |
01ee22b4 N |
7725 | { |
7726 | /* Can only proceed if there are plenty of stripe_heads. | |
7727 | * We need a minimum of one full stripe,, and for sensible progress | |
7728 | * it is best to have about 4 times that. | |
7729 | * If we require 4 times, then the default 256 4K stripe_heads will | |
7730 | * allow for chunk sizes up to 256K, which is probably OK. | |
7731 | * If the chunk size is greater, user-space should request more | |
7732 | * stripe_heads first. | |
7733 | */ | |
d1688a6d | 7734 | struct r5conf *conf = mddev->private; |
01ee22b4 | 7735 | if (((mddev->chunk_sectors << 9) / STRIPE_SIZE) * 4 |
edbe83ab | 7736 | > conf->min_nr_stripes || |
01ee22b4 | 7737 | ((mddev->new_chunk_sectors << 9) / STRIPE_SIZE) * 4 |
edbe83ab | 7738 | > conf->min_nr_stripes) { |
cc6167b4 N |
7739 | pr_warn("md/raid:%s: reshape: not enough stripes. Needed %lu\n", |
7740 | mdname(mddev), | |
7741 | ((max(mddev->chunk_sectors, mddev->new_chunk_sectors) << 9) | |
7742 | / STRIPE_SIZE)*4); | |
01ee22b4 N |
7743 | return 0; |
7744 | } | |
7745 | return 1; | |
7746 | } | |
7747 | ||
fd01b88c | 7748 | static int check_reshape(struct mddev *mddev) |
29269553 | 7749 | { |
d1688a6d | 7750 | struct r5conf *conf = mddev->private; |
29269553 | 7751 | |
3418d036 | 7752 | if (conf->log || raid5_has_ppl(conf)) |
713cf5a6 | 7753 | return -EINVAL; |
88ce4930 N |
7754 | if (mddev->delta_disks == 0 && |
7755 | mddev->new_layout == mddev->layout && | |
664e7c41 | 7756 | mddev->new_chunk_sectors == mddev->chunk_sectors) |
50ac168a | 7757 | return 0; /* nothing to do */ |
674806d6 | 7758 | if (has_failed(conf)) |
ec32a2bd | 7759 | return -EINVAL; |
fdcfbbb6 | 7760 | if (mddev->delta_disks < 0 && mddev->reshape_position == MaxSector) { |
ec32a2bd N |
7761 | /* We might be able to shrink, but the devices must |
7762 | * be made bigger first. | |
7763 | * For raid6, 4 is the minimum size. | |
7764 | * Otherwise 2 is the minimum | |
7765 | */ | |
7766 | int min = 2; | |
7767 | if (mddev->level == 6) | |
7768 | min = 4; | |
7769 | if (mddev->raid_disks + mddev->delta_disks < min) | |
7770 | return -EINVAL; | |
7771 | } | |
29269553 | 7772 | |
01ee22b4 | 7773 | if (!check_stripe_cache(mddev)) |
29269553 | 7774 | return -ENOSPC; |
29269553 | 7775 | |
738a2738 N |
7776 | if (mddev->new_chunk_sectors > mddev->chunk_sectors || |
7777 | mddev->delta_disks > 0) | |
7778 | if (resize_chunks(conf, | |
7779 | conf->previous_raid_disks | |
7780 | + max(0, mddev->delta_disks), | |
7781 | max(mddev->new_chunk_sectors, | |
7782 | mddev->chunk_sectors) | |
7783 | ) < 0) | |
7784 | return -ENOMEM; | |
845b9e22 AP |
7785 | |
7786 | if (conf->previous_raid_disks + mddev->delta_disks <= conf->pool_size) | |
7787 | return 0; /* never bother to shrink */ | |
e56108d6 N |
7788 | return resize_stripes(conf, (conf->previous_raid_disks |
7789 | + mddev->delta_disks)); | |
63c70c4f N |
7790 | } |
7791 | ||
fd01b88c | 7792 | static int raid5_start_reshape(struct mddev *mddev) |
63c70c4f | 7793 | { |
d1688a6d | 7794 | struct r5conf *conf = mddev->private; |
3cb03002 | 7795 | struct md_rdev *rdev; |
63c70c4f | 7796 | int spares = 0; |
c04be0aa | 7797 | unsigned long flags; |
63c70c4f | 7798 | |
f416885e | 7799 | if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) |
63c70c4f N |
7800 | return -EBUSY; |
7801 | ||
01ee22b4 N |
7802 | if (!check_stripe_cache(mddev)) |
7803 | return -ENOSPC; | |
7804 | ||
30b67645 N |
7805 | if (has_failed(conf)) |
7806 | return -EINVAL; | |
7807 | ||
c6563a8c | 7808 | rdev_for_each(rdev, mddev) { |
469518a3 N |
7809 | if (!test_bit(In_sync, &rdev->flags) |
7810 | && !test_bit(Faulty, &rdev->flags)) | |
29269553 | 7811 | spares++; |
c6563a8c | 7812 | } |
63c70c4f | 7813 | |
f416885e | 7814 | if (spares - mddev->degraded < mddev->delta_disks - conf->max_degraded) |
29269553 N |
7815 | /* Not enough devices even to make a degraded array |
7816 | * of that size | |
7817 | */ | |
7818 | return -EINVAL; | |
7819 | ||
ec32a2bd N |
7820 | /* Refuse to reduce size of the array. Any reductions in |
7821 | * array size must be through explicit setting of array_size | |
7822 | * attribute. | |
7823 | */ | |
7824 | if (raid5_size(mddev, 0, conf->raid_disks + mddev->delta_disks) | |
7825 | < mddev->array_sectors) { | |
cc6167b4 N |
7826 | pr_warn("md/raid:%s: array size must be reduced before number of disks\n", |
7827 | mdname(mddev)); | |
ec32a2bd N |
7828 | return -EINVAL; |
7829 | } | |
7830 | ||
f6705578 | 7831 | atomic_set(&conf->reshape_stripes, 0); |
29269553 | 7832 | spin_lock_irq(&conf->device_lock); |
c46501b2 | 7833 | write_seqcount_begin(&conf->gen_lock); |
29269553 | 7834 | conf->previous_raid_disks = conf->raid_disks; |
63c70c4f | 7835 | conf->raid_disks += mddev->delta_disks; |
09c9e5fa AN |
7836 | conf->prev_chunk_sectors = conf->chunk_sectors; |
7837 | conf->chunk_sectors = mddev->new_chunk_sectors; | |
88ce4930 N |
7838 | conf->prev_algo = conf->algorithm; |
7839 | conf->algorithm = mddev->new_layout; | |
05616be5 N |
7840 | conf->generation++; |
7841 | /* Code that selects data_offset needs to see the generation update | |
7842 | * if reshape_progress has been set - so a memory barrier needed. | |
7843 | */ | |
7844 | smp_mb(); | |
2c810cdd | 7845 | if (mddev->reshape_backwards) |
fef9c61f N |
7846 | conf->reshape_progress = raid5_size(mddev, 0, 0); |
7847 | else | |
7848 | conf->reshape_progress = 0; | |
7849 | conf->reshape_safe = conf->reshape_progress; | |
c46501b2 | 7850 | write_seqcount_end(&conf->gen_lock); |
29269553 N |
7851 | spin_unlock_irq(&conf->device_lock); |
7852 | ||
4d77e3ba N |
7853 | /* Now make sure any requests that proceeded on the assumption |
7854 | * the reshape wasn't running - like Discard or Read - have | |
7855 | * completed. | |
7856 | */ | |
7857 | mddev_suspend(mddev); | |
7858 | mddev_resume(mddev); | |
7859 | ||
29269553 N |
7860 | /* Add some new drives, as many as will fit. |
7861 | * We know there are enough to make the newly sized array work. | |
3424bf6a N |
7862 | * Don't add devices if we are reducing the number of |
7863 | * devices in the array. This is because it is not possible | |
7864 | * to correctly record the "partially reconstructed" state of | |
7865 | * such devices during the reshape and confusion could result. | |
29269553 | 7866 | */ |
87a8dec9 | 7867 | if (mddev->delta_disks >= 0) { |
dafb20fa | 7868 | rdev_for_each(rdev, mddev) |
87a8dec9 N |
7869 | if (rdev->raid_disk < 0 && |
7870 | !test_bit(Faulty, &rdev->flags)) { | |
7871 | if (raid5_add_disk(mddev, rdev) == 0) { | |
87a8dec9 | 7872 | if (rdev->raid_disk |
9d4c7d87 | 7873 | >= conf->previous_raid_disks) |
87a8dec9 | 7874 | set_bit(In_sync, &rdev->flags); |
9d4c7d87 | 7875 | else |
87a8dec9 | 7876 | rdev->recovery_offset = 0; |
36fad858 NK |
7877 | |
7878 | if (sysfs_link_rdev(mddev, rdev)) | |
87a8dec9 | 7879 | /* Failure here is OK */; |
50da0840 | 7880 | } |
87a8dec9 N |
7881 | } else if (rdev->raid_disk >= conf->previous_raid_disks |
7882 | && !test_bit(Faulty, &rdev->flags)) { | |
7883 | /* This is a spare that was manually added */ | |
7884 | set_bit(In_sync, &rdev->flags); | |
87a8dec9 | 7885 | } |
29269553 | 7886 | |
87a8dec9 N |
7887 | /* When a reshape changes the number of devices, |
7888 | * ->degraded is measured against the larger of the | |
7889 | * pre and post number of devices. | |
7890 | */ | |
ec32a2bd | 7891 | spin_lock_irqsave(&conf->device_lock, flags); |
2e38a37f | 7892 | mddev->degraded = raid5_calc_degraded(conf); |
ec32a2bd N |
7893 | spin_unlock_irqrestore(&conf->device_lock, flags); |
7894 | } | |
63c70c4f | 7895 | mddev->raid_disks = conf->raid_disks; |
e516402c | 7896 | mddev->reshape_position = conf->reshape_progress; |
2953079c | 7897 | set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags); |
f6705578 | 7898 | |
29269553 N |
7899 | clear_bit(MD_RECOVERY_SYNC, &mddev->recovery); |
7900 | clear_bit(MD_RECOVERY_CHECK, &mddev->recovery); | |
ea358cd0 | 7901 | clear_bit(MD_RECOVERY_DONE, &mddev->recovery); |
29269553 N |
7902 | set_bit(MD_RECOVERY_RESHAPE, &mddev->recovery); |
7903 | set_bit(MD_RECOVERY_RUNNING, &mddev->recovery); | |
7904 | mddev->sync_thread = md_register_thread(md_do_sync, mddev, | |
0da3c619 | 7905 | "reshape"); |
29269553 N |
7906 | if (!mddev->sync_thread) { |
7907 | mddev->recovery = 0; | |
7908 | spin_lock_irq(&conf->device_lock); | |
ba8805b9 | 7909 | write_seqcount_begin(&conf->gen_lock); |
29269553 | 7910 | mddev->raid_disks = conf->raid_disks = conf->previous_raid_disks; |
ba8805b9 N |
7911 | mddev->new_chunk_sectors = |
7912 | conf->chunk_sectors = conf->prev_chunk_sectors; | |
7913 | mddev->new_layout = conf->algorithm = conf->prev_algo; | |
05616be5 N |
7914 | rdev_for_each(rdev, mddev) |
7915 | rdev->new_data_offset = rdev->data_offset; | |
7916 | smp_wmb(); | |
ba8805b9 | 7917 | conf->generation --; |
fef9c61f | 7918 | conf->reshape_progress = MaxSector; |
1e3fa9bd | 7919 | mddev->reshape_position = MaxSector; |
ba8805b9 | 7920 | write_seqcount_end(&conf->gen_lock); |
29269553 N |
7921 | spin_unlock_irq(&conf->device_lock); |
7922 | return -EAGAIN; | |
7923 | } | |
c8f517c4 | 7924 | conf->reshape_checkpoint = jiffies; |
29269553 N |
7925 | md_wakeup_thread(mddev->sync_thread); |
7926 | md_new_event(mddev); | |
7927 | return 0; | |
7928 | } | |
29269553 | 7929 | |
ec32a2bd N |
7930 | /* This is called from the reshape thread and should make any |
7931 | * changes needed in 'conf' | |
7932 | */ | |
d1688a6d | 7933 | static void end_reshape(struct r5conf *conf) |
29269553 | 7934 | { |
29269553 | 7935 | |
f6705578 | 7936 | if (!test_bit(MD_RECOVERY_INTR, &conf->mddev->recovery)) { |
05616be5 | 7937 | struct md_rdev *rdev; |
f6705578 | 7938 | |
f6705578 | 7939 | spin_lock_irq(&conf->device_lock); |
cea9c228 | 7940 | conf->previous_raid_disks = conf->raid_disks; |
05616be5 N |
7941 | rdev_for_each(rdev, conf->mddev) |
7942 | rdev->data_offset = rdev->new_data_offset; | |
7943 | smp_wmb(); | |
fef9c61f | 7944 | conf->reshape_progress = MaxSector; |
6cbd8148 | 7945 | conf->mddev->reshape_position = MaxSector; |
f6705578 | 7946 | spin_unlock_irq(&conf->device_lock); |
b0f9ec04 | 7947 | wake_up(&conf->wait_for_overlap); |
16a53ecc N |
7948 | |
7949 | /* read-ahead size must cover two whole stripes, which is | |
7950 | * 2 * (datadisks) * chunksize where 'n' is the number of raid devices | |
7951 | */ | |
4a5add49 | 7952 | if (conf->mddev->queue) { |
cea9c228 | 7953 | int data_disks = conf->raid_disks - conf->max_degraded; |
09c9e5fa | 7954 | int stripe = data_disks * ((conf->chunk_sectors << 9) |
cea9c228 | 7955 | / PAGE_SIZE); |
dc3b17cc JK |
7956 | if (conf->mddev->queue->backing_dev_info->ra_pages < 2 * stripe) |
7957 | conf->mddev->queue->backing_dev_info->ra_pages = 2 * stripe; | |
16a53ecc | 7958 | } |
29269553 | 7959 | } |
29269553 N |
7960 | } |
7961 | ||
ec32a2bd N |
7962 | /* This is called from the raid5d thread with mddev_lock held. |
7963 | * It makes config changes to the device. | |
7964 | */ | |
fd01b88c | 7965 | static void raid5_finish_reshape(struct mddev *mddev) |
cea9c228 | 7966 | { |
d1688a6d | 7967 | struct r5conf *conf = mddev->private; |
cea9c228 N |
7968 | |
7969 | if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery)) { | |
7970 | ||
ec32a2bd N |
7971 | if (mddev->delta_disks > 0) { |
7972 | md_set_array_sectors(mddev, raid5_size(mddev, 0, 0)); | |
fe67d19a HM |
7973 | if (mddev->queue) { |
7974 | set_capacity(mddev->gendisk, mddev->array_sectors); | |
7975 | revalidate_disk(mddev->gendisk); | |
7976 | } | |
ec32a2bd N |
7977 | } else { |
7978 | int d; | |
908f4fbd | 7979 | spin_lock_irq(&conf->device_lock); |
2e38a37f | 7980 | mddev->degraded = raid5_calc_degraded(conf); |
908f4fbd | 7981 | spin_unlock_irq(&conf->device_lock); |
ec32a2bd N |
7982 | for (d = conf->raid_disks ; |
7983 | d < conf->raid_disks - mddev->delta_disks; | |
1a67dde0 | 7984 | d++) { |
3cb03002 | 7985 | struct md_rdev *rdev = conf->disks[d].rdev; |
da7613b8 N |
7986 | if (rdev) |
7987 | clear_bit(In_sync, &rdev->flags); | |
7988 | rdev = conf->disks[d].replacement; | |
7989 | if (rdev) | |
7990 | clear_bit(In_sync, &rdev->flags); | |
1a67dde0 | 7991 | } |
cea9c228 | 7992 | } |
88ce4930 | 7993 | mddev->layout = conf->algorithm; |
09c9e5fa | 7994 | mddev->chunk_sectors = conf->chunk_sectors; |
ec32a2bd N |
7995 | mddev->reshape_position = MaxSector; |
7996 | mddev->delta_disks = 0; | |
2c810cdd | 7997 | mddev->reshape_backwards = 0; |
cea9c228 N |
7998 | } |
7999 | } | |
8000 | ||
fd01b88c | 8001 | static void raid5_quiesce(struct mddev *mddev, int state) |
72626685 | 8002 | { |
d1688a6d | 8003 | struct r5conf *conf = mddev->private; |
72626685 N |
8004 | |
8005 | switch(state) { | |
e464eafd N |
8006 | case 2: /* resume for a suspend */ |
8007 | wake_up(&conf->wait_for_overlap); | |
8008 | break; | |
8009 | ||
72626685 | 8010 | case 1: /* stop all writes */ |
566c09c5 | 8011 | lock_all_device_hash_locks_irq(conf); |
64bd660b N |
8012 | /* '2' tells resync/reshape to pause so that all |
8013 | * active stripes can drain | |
8014 | */ | |
a39f7afd | 8015 | r5c_flush_cache(conf, INT_MAX); |
64bd660b | 8016 | conf->quiesce = 2; |
b1b46486 | 8017 | wait_event_cmd(conf->wait_for_quiescent, |
46031f9a RBJ |
8018 | atomic_read(&conf->active_stripes) == 0 && |
8019 | atomic_read(&conf->active_aligned_reads) == 0, | |
566c09c5 SL |
8020 | unlock_all_device_hash_locks_irq(conf), |
8021 | lock_all_device_hash_locks_irq(conf)); | |
64bd660b | 8022 | conf->quiesce = 1; |
566c09c5 | 8023 | unlock_all_device_hash_locks_irq(conf); |
64bd660b N |
8024 | /* allow reshape to continue */ |
8025 | wake_up(&conf->wait_for_overlap); | |
72626685 N |
8026 | break; |
8027 | ||
8028 | case 0: /* re-enable writes */ | |
566c09c5 | 8029 | lock_all_device_hash_locks_irq(conf); |
72626685 | 8030 | conf->quiesce = 0; |
b1b46486 | 8031 | wake_up(&conf->wait_for_quiescent); |
e464eafd | 8032 | wake_up(&conf->wait_for_overlap); |
566c09c5 | 8033 | unlock_all_device_hash_locks_irq(conf); |
72626685 N |
8034 | break; |
8035 | } | |
e6c033f7 | 8036 | r5l_quiesce(conf->log, state); |
72626685 | 8037 | } |
b15c2e57 | 8038 | |
fd01b88c | 8039 | static void *raid45_takeover_raid0(struct mddev *mddev, int level) |
54071b38 | 8040 | { |
e373ab10 | 8041 | struct r0conf *raid0_conf = mddev->private; |
d76c8420 | 8042 | sector_t sectors; |
54071b38 | 8043 | |
f1b29bca | 8044 | /* for raid0 takeover only one zone is supported */ |
e373ab10 | 8045 | if (raid0_conf->nr_strip_zones > 1) { |
cc6167b4 N |
8046 | pr_warn("md/raid:%s: cannot takeover raid0 with more than one zone.\n", |
8047 | mdname(mddev)); | |
f1b29bca DW |
8048 | return ERR_PTR(-EINVAL); |
8049 | } | |
8050 | ||
e373ab10 N |
8051 | sectors = raid0_conf->strip_zone[0].zone_end; |
8052 | sector_div(sectors, raid0_conf->strip_zone[0].nb_dev); | |
3b71bd93 | 8053 | mddev->dev_sectors = sectors; |
f1b29bca | 8054 | mddev->new_level = level; |
54071b38 TM |
8055 | mddev->new_layout = ALGORITHM_PARITY_N; |
8056 | mddev->new_chunk_sectors = mddev->chunk_sectors; | |
8057 | mddev->raid_disks += 1; | |
8058 | mddev->delta_disks = 1; | |
8059 | /* make sure it will be not marked as dirty */ | |
8060 | mddev->recovery_cp = MaxSector; | |
8061 | ||
8062 | return setup_conf(mddev); | |
8063 | } | |
8064 | ||
fd01b88c | 8065 | static void *raid5_takeover_raid1(struct mddev *mddev) |
d562b0c4 N |
8066 | { |
8067 | int chunksect; | |
6995f0b2 | 8068 | void *ret; |
d562b0c4 N |
8069 | |
8070 | if (mddev->raid_disks != 2 || | |
8071 | mddev->degraded > 1) | |
8072 | return ERR_PTR(-EINVAL); | |
8073 | ||
8074 | /* Should check if there are write-behind devices? */ | |
8075 | ||
8076 | chunksect = 64*2; /* 64K by default */ | |
8077 | ||
8078 | /* The array must be an exact multiple of chunksize */ | |
8079 | while (chunksect && (mddev->array_sectors & (chunksect-1))) | |
8080 | chunksect >>= 1; | |
8081 | ||
8082 | if ((chunksect<<9) < STRIPE_SIZE) | |
8083 | /* array size does not allow a suitable chunk size */ | |
8084 | return ERR_PTR(-EINVAL); | |
8085 | ||
8086 | mddev->new_level = 5; | |
8087 | mddev->new_layout = ALGORITHM_LEFT_SYMMETRIC; | |
664e7c41 | 8088 | mddev->new_chunk_sectors = chunksect; |
d562b0c4 | 8089 | |
6995f0b2 | 8090 | ret = setup_conf(mddev); |
32cd7cbb | 8091 | if (!IS_ERR(ret)) |
394ed8e4 SL |
8092 | mddev_clear_unsupported_flags(mddev, |
8093 | UNSUPPORTED_MDDEV_FLAGS); | |
6995f0b2 | 8094 | return ret; |
d562b0c4 N |
8095 | } |
8096 | ||
fd01b88c | 8097 | static void *raid5_takeover_raid6(struct mddev *mddev) |
fc9739c6 N |
8098 | { |
8099 | int new_layout; | |
8100 | ||
8101 | switch (mddev->layout) { | |
8102 | case ALGORITHM_LEFT_ASYMMETRIC_6: | |
8103 | new_layout = ALGORITHM_LEFT_ASYMMETRIC; | |
8104 | break; | |
8105 | case ALGORITHM_RIGHT_ASYMMETRIC_6: | |
8106 | new_layout = ALGORITHM_RIGHT_ASYMMETRIC; | |
8107 | break; | |
8108 | case ALGORITHM_LEFT_SYMMETRIC_6: | |
8109 | new_layout = ALGORITHM_LEFT_SYMMETRIC; | |
8110 | break; | |
8111 | case ALGORITHM_RIGHT_SYMMETRIC_6: | |
8112 | new_layout = ALGORITHM_RIGHT_SYMMETRIC; | |
8113 | break; | |
8114 | case ALGORITHM_PARITY_0_6: | |
8115 | new_layout = ALGORITHM_PARITY_0; | |
8116 | break; | |
8117 | case ALGORITHM_PARITY_N: | |
8118 | new_layout = ALGORITHM_PARITY_N; | |
8119 | break; | |
8120 | default: | |
8121 | return ERR_PTR(-EINVAL); | |
8122 | } | |
8123 | mddev->new_level = 5; | |
8124 | mddev->new_layout = new_layout; | |
8125 | mddev->delta_disks = -1; | |
8126 | mddev->raid_disks -= 1; | |
8127 | return setup_conf(mddev); | |
8128 | } | |
8129 | ||
fd01b88c | 8130 | static int raid5_check_reshape(struct mddev *mddev) |
b3546035 | 8131 | { |
88ce4930 N |
8132 | /* For a 2-drive array, the layout and chunk size can be changed |
8133 | * immediately as not restriping is needed. | |
8134 | * For larger arrays we record the new value - after validation | |
8135 | * to be used by a reshape pass. | |
b3546035 | 8136 | */ |
d1688a6d | 8137 | struct r5conf *conf = mddev->private; |
597a711b | 8138 | int new_chunk = mddev->new_chunk_sectors; |
b3546035 | 8139 | |
597a711b | 8140 | if (mddev->new_layout >= 0 && !algorithm_valid_raid5(mddev->new_layout)) |
b3546035 N |
8141 | return -EINVAL; |
8142 | if (new_chunk > 0) { | |
0ba459d2 | 8143 | if (!is_power_of_2(new_chunk)) |
b3546035 | 8144 | return -EINVAL; |
597a711b | 8145 | if (new_chunk < (PAGE_SIZE>>9)) |
b3546035 | 8146 | return -EINVAL; |
597a711b | 8147 | if (mddev->array_sectors & (new_chunk-1)) |
b3546035 N |
8148 | /* not factor of array size */ |
8149 | return -EINVAL; | |
8150 | } | |
8151 | ||
8152 | /* They look valid */ | |
8153 | ||
88ce4930 | 8154 | if (mddev->raid_disks == 2) { |
597a711b N |
8155 | /* can make the change immediately */ |
8156 | if (mddev->new_layout >= 0) { | |
8157 | conf->algorithm = mddev->new_layout; | |
8158 | mddev->layout = mddev->new_layout; | |
88ce4930 N |
8159 | } |
8160 | if (new_chunk > 0) { | |
597a711b N |
8161 | conf->chunk_sectors = new_chunk ; |
8162 | mddev->chunk_sectors = new_chunk; | |
88ce4930 | 8163 | } |
2953079c | 8164 | set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags); |
88ce4930 | 8165 | md_wakeup_thread(mddev->thread); |
b3546035 | 8166 | } |
50ac168a | 8167 | return check_reshape(mddev); |
88ce4930 N |
8168 | } |
8169 | ||
fd01b88c | 8170 | static int raid6_check_reshape(struct mddev *mddev) |
88ce4930 | 8171 | { |
597a711b | 8172 | int new_chunk = mddev->new_chunk_sectors; |
50ac168a | 8173 | |
597a711b | 8174 | if (mddev->new_layout >= 0 && !algorithm_valid_raid6(mddev->new_layout)) |
88ce4930 | 8175 | return -EINVAL; |
b3546035 | 8176 | if (new_chunk > 0) { |
0ba459d2 | 8177 | if (!is_power_of_2(new_chunk)) |
88ce4930 | 8178 | return -EINVAL; |
597a711b | 8179 | if (new_chunk < (PAGE_SIZE >> 9)) |
88ce4930 | 8180 | return -EINVAL; |
597a711b | 8181 | if (mddev->array_sectors & (new_chunk-1)) |
88ce4930 N |
8182 | /* not factor of array size */ |
8183 | return -EINVAL; | |
b3546035 | 8184 | } |
88ce4930 N |
8185 | |
8186 | /* They look valid */ | |
50ac168a | 8187 | return check_reshape(mddev); |
b3546035 N |
8188 | } |
8189 | ||
fd01b88c | 8190 | static void *raid5_takeover(struct mddev *mddev) |
d562b0c4 N |
8191 | { |
8192 | /* raid5 can take over: | |
f1b29bca | 8193 | * raid0 - if there is only one strip zone - make it a raid4 layout |
d562b0c4 N |
8194 | * raid1 - if there are two drives. We need to know the chunk size |
8195 | * raid4 - trivial - just use a raid4 layout. | |
8196 | * raid6 - Providing it is a *_6 layout | |
d562b0c4 | 8197 | */ |
f1b29bca DW |
8198 | if (mddev->level == 0) |
8199 | return raid45_takeover_raid0(mddev, 5); | |
d562b0c4 N |
8200 | if (mddev->level == 1) |
8201 | return raid5_takeover_raid1(mddev); | |
e9d4758f N |
8202 | if (mddev->level == 4) { |
8203 | mddev->new_layout = ALGORITHM_PARITY_N; | |
8204 | mddev->new_level = 5; | |
8205 | return setup_conf(mddev); | |
8206 | } | |
fc9739c6 N |
8207 | if (mddev->level == 6) |
8208 | return raid5_takeover_raid6(mddev); | |
d562b0c4 N |
8209 | |
8210 | return ERR_PTR(-EINVAL); | |
8211 | } | |
8212 | ||
fd01b88c | 8213 | static void *raid4_takeover(struct mddev *mddev) |
a78d38a1 | 8214 | { |
f1b29bca DW |
8215 | /* raid4 can take over: |
8216 | * raid0 - if there is only one strip zone | |
8217 | * raid5 - if layout is right | |
a78d38a1 | 8218 | */ |
f1b29bca DW |
8219 | if (mddev->level == 0) |
8220 | return raid45_takeover_raid0(mddev, 4); | |
a78d38a1 N |
8221 | if (mddev->level == 5 && |
8222 | mddev->layout == ALGORITHM_PARITY_N) { | |
8223 | mddev->new_layout = 0; | |
8224 | mddev->new_level = 4; | |
8225 | return setup_conf(mddev); | |
8226 | } | |
8227 | return ERR_PTR(-EINVAL); | |
8228 | } | |
d562b0c4 | 8229 | |
84fc4b56 | 8230 | static struct md_personality raid5_personality; |
245f46c2 | 8231 | |
fd01b88c | 8232 | static void *raid6_takeover(struct mddev *mddev) |
245f46c2 N |
8233 | { |
8234 | /* Currently can only take over a raid5. We map the | |
8235 | * personality to an equivalent raid6 personality | |
8236 | * with the Q block at the end. | |
8237 | */ | |
8238 | int new_layout; | |
8239 | ||
8240 | if (mddev->pers != &raid5_personality) | |
8241 | return ERR_PTR(-EINVAL); | |
8242 | if (mddev->degraded > 1) | |
8243 | return ERR_PTR(-EINVAL); | |
8244 | if (mddev->raid_disks > 253) | |
8245 | return ERR_PTR(-EINVAL); | |
8246 | if (mddev->raid_disks < 3) | |
8247 | return ERR_PTR(-EINVAL); | |
8248 | ||
8249 | switch (mddev->layout) { | |
8250 | case ALGORITHM_LEFT_ASYMMETRIC: | |
8251 | new_layout = ALGORITHM_LEFT_ASYMMETRIC_6; | |
8252 | break; | |
8253 | case ALGORITHM_RIGHT_ASYMMETRIC: | |
8254 | new_layout = ALGORITHM_RIGHT_ASYMMETRIC_6; | |
8255 | break; | |
8256 | case ALGORITHM_LEFT_SYMMETRIC: | |
8257 | new_layout = ALGORITHM_LEFT_SYMMETRIC_6; | |
8258 | break; | |
8259 | case ALGORITHM_RIGHT_SYMMETRIC: | |
8260 | new_layout = ALGORITHM_RIGHT_SYMMETRIC_6; | |
8261 | break; | |
8262 | case ALGORITHM_PARITY_0: | |
8263 | new_layout = ALGORITHM_PARITY_0_6; | |
8264 | break; | |
8265 | case ALGORITHM_PARITY_N: | |
8266 | new_layout = ALGORITHM_PARITY_N; | |
8267 | break; | |
8268 | default: | |
8269 | return ERR_PTR(-EINVAL); | |
8270 | } | |
8271 | mddev->new_level = 6; | |
8272 | mddev->new_layout = new_layout; | |
8273 | mddev->delta_disks = 1; | |
8274 | mddev->raid_disks += 1; | |
8275 | return setup_conf(mddev); | |
8276 | } | |
8277 | ||
ba903a3e AP |
8278 | static int raid5_change_consistency_policy(struct mddev *mddev, const char *buf) |
8279 | { | |
8280 | struct r5conf *conf; | |
8281 | int err; | |
8282 | ||
8283 | err = mddev_lock(mddev); | |
8284 | if (err) | |
8285 | return err; | |
8286 | conf = mddev->private; | |
8287 | if (!conf) { | |
8288 | mddev_unlock(mddev); | |
8289 | return -ENODEV; | |
8290 | } | |
8291 | ||
845b9e22 | 8292 | if (strncmp(buf, "ppl", 3) == 0) { |
0bb0c105 | 8293 | /* ppl only works with RAID 5 */ |
845b9e22 AP |
8294 | if (!raid5_has_ppl(conf) && conf->level == 5) { |
8295 | err = log_init(conf, NULL, true); | |
8296 | if (!err) { | |
8297 | err = resize_stripes(conf, conf->pool_size); | |
8298 | if (err) | |
8299 | log_exit(conf); | |
8300 | } | |
0bb0c105 SL |
8301 | } else |
8302 | err = -EINVAL; | |
8303 | } else if (strncmp(buf, "resync", 6) == 0) { | |
8304 | if (raid5_has_ppl(conf)) { | |
8305 | mddev_suspend(mddev); | |
8306 | log_exit(conf); | |
0bb0c105 | 8307 | mddev_resume(mddev); |
845b9e22 | 8308 | err = resize_stripes(conf, conf->pool_size); |
0bb0c105 SL |
8309 | } else if (test_bit(MD_HAS_JOURNAL, &conf->mddev->flags) && |
8310 | r5l_log_disk_error(conf)) { | |
8311 | bool journal_dev_exists = false; | |
8312 | struct md_rdev *rdev; | |
8313 | ||
8314 | rdev_for_each(rdev, mddev) | |
8315 | if (test_bit(Journal, &rdev->flags)) { | |
8316 | journal_dev_exists = true; | |
8317 | break; | |
8318 | } | |
8319 | ||
8320 | if (!journal_dev_exists) { | |
8321 | mddev_suspend(mddev); | |
8322 | clear_bit(MD_HAS_JOURNAL, &mddev->flags); | |
8323 | mddev_resume(mddev); | |
8324 | } else /* need remove journal device first */ | |
8325 | err = -EBUSY; | |
8326 | } else | |
8327 | err = -EINVAL; | |
ba903a3e AP |
8328 | } else { |
8329 | err = -EINVAL; | |
8330 | } | |
8331 | ||
8332 | if (!err) | |
8333 | md_update_sb(mddev, 1); | |
8334 | ||
8335 | mddev_unlock(mddev); | |
8336 | ||
8337 | return err; | |
8338 | } | |
8339 | ||
84fc4b56 | 8340 | static struct md_personality raid6_personality = |
16a53ecc N |
8341 | { |
8342 | .name = "raid6", | |
8343 | .level = 6, | |
8344 | .owner = THIS_MODULE, | |
849674e4 SL |
8345 | .make_request = raid5_make_request, |
8346 | .run = raid5_run, | |
afa0f557 | 8347 | .free = raid5_free, |
849674e4 SL |
8348 | .status = raid5_status, |
8349 | .error_handler = raid5_error, | |
16a53ecc N |
8350 | .hot_add_disk = raid5_add_disk, |
8351 | .hot_remove_disk= raid5_remove_disk, | |
8352 | .spare_active = raid5_spare_active, | |
849674e4 | 8353 | .sync_request = raid5_sync_request, |
16a53ecc | 8354 | .resize = raid5_resize, |
80c3a6ce | 8355 | .size = raid5_size, |
50ac168a | 8356 | .check_reshape = raid6_check_reshape, |
f416885e | 8357 | .start_reshape = raid5_start_reshape, |
cea9c228 | 8358 | .finish_reshape = raid5_finish_reshape, |
16a53ecc | 8359 | .quiesce = raid5_quiesce, |
245f46c2 | 8360 | .takeover = raid6_takeover, |
5c675f83 | 8361 | .congested = raid5_congested, |
0bb0c105 | 8362 | .change_consistency_policy = raid5_change_consistency_policy, |
16a53ecc | 8363 | }; |
84fc4b56 | 8364 | static struct md_personality raid5_personality = |
1da177e4 LT |
8365 | { |
8366 | .name = "raid5", | |
2604b703 | 8367 | .level = 5, |
1da177e4 | 8368 | .owner = THIS_MODULE, |
849674e4 SL |
8369 | .make_request = raid5_make_request, |
8370 | .run = raid5_run, | |
afa0f557 | 8371 | .free = raid5_free, |
849674e4 SL |
8372 | .status = raid5_status, |
8373 | .error_handler = raid5_error, | |
1da177e4 LT |
8374 | .hot_add_disk = raid5_add_disk, |
8375 | .hot_remove_disk= raid5_remove_disk, | |
8376 | .spare_active = raid5_spare_active, | |
849674e4 | 8377 | .sync_request = raid5_sync_request, |
1da177e4 | 8378 | .resize = raid5_resize, |
80c3a6ce | 8379 | .size = raid5_size, |
63c70c4f N |
8380 | .check_reshape = raid5_check_reshape, |
8381 | .start_reshape = raid5_start_reshape, | |
cea9c228 | 8382 | .finish_reshape = raid5_finish_reshape, |
72626685 | 8383 | .quiesce = raid5_quiesce, |
d562b0c4 | 8384 | .takeover = raid5_takeover, |
5c675f83 | 8385 | .congested = raid5_congested, |
ba903a3e | 8386 | .change_consistency_policy = raid5_change_consistency_policy, |
1da177e4 LT |
8387 | }; |
8388 | ||
84fc4b56 | 8389 | static struct md_personality raid4_personality = |
1da177e4 | 8390 | { |
2604b703 N |
8391 | .name = "raid4", |
8392 | .level = 4, | |
8393 | .owner = THIS_MODULE, | |
849674e4 SL |
8394 | .make_request = raid5_make_request, |
8395 | .run = raid5_run, | |
afa0f557 | 8396 | .free = raid5_free, |
849674e4 SL |
8397 | .status = raid5_status, |
8398 | .error_handler = raid5_error, | |
2604b703 N |
8399 | .hot_add_disk = raid5_add_disk, |
8400 | .hot_remove_disk= raid5_remove_disk, | |
8401 | .spare_active = raid5_spare_active, | |
849674e4 | 8402 | .sync_request = raid5_sync_request, |
2604b703 | 8403 | .resize = raid5_resize, |
80c3a6ce | 8404 | .size = raid5_size, |
3d37890b N |
8405 | .check_reshape = raid5_check_reshape, |
8406 | .start_reshape = raid5_start_reshape, | |
cea9c228 | 8407 | .finish_reshape = raid5_finish_reshape, |
2604b703 | 8408 | .quiesce = raid5_quiesce, |
a78d38a1 | 8409 | .takeover = raid4_takeover, |
5c675f83 | 8410 | .congested = raid5_congested, |
0bb0c105 | 8411 | .change_consistency_policy = raid5_change_consistency_policy, |
2604b703 N |
8412 | }; |
8413 | ||
8414 | static int __init raid5_init(void) | |
8415 | { | |
29c6d1bb SAS |
8416 | int ret; |
8417 | ||
851c30c9 SL |
8418 | raid5_wq = alloc_workqueue("raid5wq", |
8419 | WQ_UNBOUND|WQ_MEM_RECLAIM|WQ_CPU_INTENSIVE|WQ_SYSFS, 0); | |
8420 | if (!raid5_wq) | |
8421 | return -ENOMEM; | |
29c6d1bb SAS |
8422 | |
8423 | ret = cpuhp_setup_state_multi(CPUHP_MD_RAID5_PREPARE, | |
8424 | "md/raid5:prepare", | |
8425 | raid456_cpu_up_prepare, | |
8426 | raid456_cpu_dead); | |
8427 | if (ret) { | |
8428 | destroy_workqueue(raid5_wq); | |
8429 | return ret; | |
8430 | } | |
16a53ecc | 8431 | register_md_personality(&raid6_personality); |
2604b703 N |
8432 | register_md_personality(&raid5_personality); |
8433 | register_md_personality(&raid4_personality); | |
8434 | return 0; | |
1da177e4 LT |
8435 | } |
8436 | ||
2604b703 | 8437 | static void raid5_exit(void) |
1da177e4 | 8438 | { |
16a53ecc | 8439 | unregister_md_personality(&raid6_personality); |
2604b703 N |
8440 | unregister_md_personality(&raid5_personality); |
8441 | unregister_md_personality(&raid4_personality); | |
29c6d1bb | 8442 | cpuhp_remove_multi_state(CPUHP_MD_RAID5_PREPARE); |
851c30c9 | 8443 | destroy_workqueue(raid5_wq); |
1da177e4 LT |
8444 | } |
8445 | ||
8446 | module_init(raid5_init); | |
8447 | module_exit(raid5_exit); | |
8448 | MODULE_LICENSE("GPL"); | |
0efb9e61 | 8449 | MODULE_DESCRIPTION("RAID4/5/6 (striping with parity) personality for MD"); |
1da177e4 | 8450 | MODULE_ALIAS("md-personality-4"); /* RAID5 */ |
d9d166c2 N |
8451 | MODULE_ALIAS("md-raid5"); |
8452 | MODULE_ALIAS("md-raid4"); | |
2604b703 N |
8453 | MODULE_ALIAS("md-level-5"); |
8454 | MODULE_ALIAS("md-level-4"); | |
16a53ecc N |
8455 | MODULE_ALIAS("md-personality-8"); /* RAID6 */ |
8456 | MODULE_ALIAS("md-raid6"); | |
8457 | MODULE_ALIAS("md-level-6"); | |
8458 | ||
8459 | /* This used to be two separate modules, they were: */ | |
8460 | MODULE_ALIAS("raid5"); | |
8461 | MODULE_ALIAS("raid6"); |