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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * raid5.c : Multiple Devices driver for Linux | |
3 | * Copyright (C) 1996, 1997 Ingo Molnar, Miguel de Icaza, Gadi Oxman | |
4 | * Copyright (C) 1999, 2000 Ingo Molnar | |
16a53ecc | 5 | * Copyright (C) 2002, 2003 H. Peter Anvin |
1da177e4 | 6 | * |
16a53ecc N |
7 | * RAID-4/5/6 management functions. |
8 | * Thanks to Penguin Computing for making the RAID-6 development possible | |
9 | * by donating a test server! | |
1da177e4 LT |
10 | * |
11 | * This program is free software; you can redistribute it and/or modify | |
12 | * it under the terms of the GNU General Public License as published by | |
13 | * the Free Software Foundation; either version 2, or (at your option) | |
14 | * any later version. | |
15 | * | |
16 | * You should have received a copy of the GNU General Public License | |
17 | * (for example /usr/src/linux/COPYING); if not, write to the Free | |
18 | * Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. | |
19 | */ | |
20 | ||
ae3c20cc N |
21 | /* |
22 | * BITMAP UNPLUGGING: | |
23 | * | |
24 | * The sequencing for updating the bitmap reliably is a little | |
25 | * subtle (and I got it wrong the first time) so it deserves some | |
26 | * explanation. | |
27 | * | |
28 | * We group bitmap updates into batches. Each batch has a number. | |
29 | * We may write out several batches at once, but that isn't very important. | |
7c13edc8 N |
30 | * conf->seq_write is the number of the last batch successfully written. |
31 | * conf->seq_flush is the number of the last batch that was closed to | |
ae3c20cc N |
32 | * new additions. |
33 | * When we discover that we will need to write to any block in a stripe | |
34 | * (in add_stripe_bio) we update the in-memory bitmap and record in sh->bm_seq | |
7c13edc8 | 35 | * the number of the batch it will be in. This is seq_flush+1. |
ae3c20cc N |
36 | * When we are ready to do a write, if that batch hasn't been written yet, |
37 | * we plug the array and queue the stripe for later. | |
38 | * When an unplug happens, we increment bm_flush, thus closing the current | |
39 | * batch. | |
40 | * When we notice that bm_flush > bm_write, we write out all pending updates | |
41 | * to the bitmap, and advance bm_write to where bm_flush was. | |
42 | * This may occasionally write a bit out twice, but is sure never to | |
43 | * miss any bits. | |
44 | */ | |
1da177e4 | 45 | |
bff61975 | 46 | #include <linux/blkdev.h> |
f6705578 | 47 | #include <linux/kthread.h> |
f701d589 | 48 | #include <linux/raid/pq.h> |
91c00924 | 49 | #include <linux/async_tx.h> |
056075c7 | 50 | #include <linux/module.h> |
07a3b417 | 51 | #include <linux/async.h> |
bff61975 | 52 | #include <linux/seq_file.h> |
36d1c647 | 53 | #include <linux/cpu.h> |
5a0e3ad6 | 54 | #include <linux/slab.h> |
8bda470e | 55 | #include <linux/ratelimit.h> |
851c30c9 | 56 | #include <linux/nodemask.h> |
46d5b785 | 57 | #include <linux/flex_array.h> |
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; | |
106 | local_irq_disable(); | |
107 | spin_lock(conf->hash_locks); | |
108 | for (i = 1; i < NR_STRIPE_HASH_LOCKS; i++) | |
109 | spin_lock_nest_lock(conf->hash_locks + i, conf->hash_locks); | |
110 | spin_lock(&conf->device_lock); | |
111 | } | |
112 | ||
113 | static inline void unlock_all_device_hash_locks_irq(struct r5conf *conf) | |
114 | { | |
115 | int i; | |
116 | spin_unlock(&conf->device_lock); | |
117 | for (i = NR_STRIPE_HASH_LOCKS; i; i--) | |
118 | spin_unlock(conf->hash_locks + i - 1); | |
119 | local_irq_enable(); | |
120 | } | |
121 | ||
d0dabf7e N |
122 | /* Find first data disk in a raid6 stripe */ |
123 | static inline int raid6_d0(struct stripe_head *sh) | |
124 | { | |
67cc2b81 N |
125 | if (sh->ddf_layout) |
126 | /* ddf always start from first device */ | |
127 | return 0; | |
128 | /* md starts just after Q block */ | |
d0dabf7e N |
129 | if (sh->qd_idx == sh->disks - 1) |
130 | return 0; | |
131 | else | |
132 | return sh->qd_idx + 1; | |
133 | } | |
16a53ecc N |
134 | static inline int raid6_next_disk(int disk, int raid_disks) |
135 | { | |
136 | disk++; | |
137 | return (disk < raid_disks) ? disk : 0; | |
138 | } | |
a4456856 | 139 | |
d0dabf7e N |
140 | /* When walking through the disks in a raid5, starting at raid6_d0, |
141 | * We need to map each disk to a 'slot', where the data disks are slot | |
142 | * 0 .. raid_disks-3, the parity disk is raid_disks-2 and the Q disk | |
143 | * is raid_disks-1. This help does that mapping. | |
144 | */ | |
67cc2b81 N |
145 | static int raid6_idx_to_slot(int idx, struct stripe_head *sh, |
146 | int *count, int syndrome_disks) | |
d0dabf7e | 147 | { |
6629542e | 148 | int slot = *count; |
67cc2b81 | 149 | |
e4424fee | 150 | if (sh->ddf_layout) |
6629542e | 151 | (*count)++; |
d0dabf7e | 152 | if (idx == sh->pd_idx) |
67cc2b81 | 153 | return syndrome_disks; |
d0dabf7e | 154 | if (idx == sh->qd_idx) |
67cc2b81 | 155 | return syndrome_disks + 1; |
e4424fee | 156 | if (!sh->ddf_layout) |
6629542e | 157 | (*count)++; |
d0dabf7e N |
158 | return slot; |
159 | } | |
160 | ||
d1688a6d | 161 | static void print_raid5_conf (struct r5conf *conf); |
1da177e4 | 162 | |
600aa109 DW |
163 | static int stripe_operations_active(struct stripe_head *sh) |
164 | { | |
165 | return sh->check_state || sh->reconstruct_state || | |
166 | test_bit(STRIPE_BIOFILL_RUN, &sh->state) || | |
167 | test_bit(STRIPE_COMPUTE_RUN, &sh->state); | |
168 | } | |
169 | ||
535ae4eb SL |
170 | static bool stripe_is_lowprio(struct stripe_head *sh) |
171 | { | |
172 | return (test_bit(STRIPE_R5C_FULL_STRIPE, &sh->state) || | |
173 | test_bit(STRIPE_R5C_PARTIAL_STRIPE, &sh->state)) && | |
174 | !test_bit(STRIPE_R5C_CACHING, &sh->state); | |
175 | } | |
176 | ||
851c30c9 SL |
177 | static void raid5_wakeup_stripe_thread(struct stripe_head *sh) |
178 | { | |
179 | struct r5conf *conf = sh->raid_conf; | |
180 | struct r5worker_group *group; | |
bfc90cb0 | 181 | int thread_cnt; |
851c30c9 SL |
182 | int i, cpu = sh->cpu; |
183 | ||
184 | if (!cpu_online(cpu)) { | |
185 | cpu = cpumask_any(cpu_online_mask); | |
186 | sh->cpu = cpu; | |
187 | } | |
188 | ||
189 | if (list_empty(&sh->lru)) { | |
190 | struct r5worker_group *group; | |
191 | group = conf->worker_groups + cpu_to_group(cpu); | |
535ae4eb SL |
192 | if (stripe_is_lowprio(sh)) |
193 | list_add_tail(&sh->lru, &group->loprio_list); | |
194 | else | |
195 | list_add_tail(&sh->lru, &group->handle_list); | |
bfc90cb0 SL |
196 | group->stripes_cnt++; |
197 | sh->group = group; | |
851c30c9 SL |
198 | } |
199 | ||
200 | if (conf->worker_cnt_per_group == 0) { | |
201 | md_wakeup_thread(conf->mddev->thread); | |
202 | return; | |
203 | } | |
204 | ||
205 | group = conf->worker_groups + cpu_to_group(sh->cpu); | |
206 | ||
bfc90cb0 SL |
207 | group->workers[0].working = true; |
208 | /* at least one worker should run to avoid race */ | |
209 | queue_work_on(sh->cpu, raid5_wq, &group->workers[0].work); | |
210 | ||
211 | thread_cnt = group->stripes_cnt / MAX_STRIPE_BATCH - 1; | |
212 | /* wakeup more workers */ | |
213 | for (i = 1; i < conf->worker_cnt_per_group && thread_cnt > 0; i++) { | |
214 | if (group->workers[i].working == false) { | |
215 | group->workers[i].working = true; | |
216 | queue_work_on(sh->cpu, raid5_wq, | |
217 | &group->workers[i].work); | |
218 | thread_cnt--; | |
219 | } | |
220 | } | |
851c30c9 SL |
221 | } |
222 | ||
566c09c5 SL |
223 | static void do_release_stripe(struct r5conf *conf, struct stripe_head *sh, |
224 | struct list_head *temp_inactive_list) | |
1da177e4 | 225 | { |
1e6d690b SL |
226 | int i; |
227 | int injournal = 0; /* number of date pages with R5_InJournal */ | |
228 | ||
4eb788df SL |
229 | BUG_ON(!list_empty(&sh->lru)); |
230 | BUG_ON(atomic_read(&conf->active_stripes)==0); | |
1e6d690b SL |
231 | |
232 | if (r5c_is_writeback(conf->log)) | |
233 | for (i = sh->disks; i--; ) | |
234 | if (test_bit(R5_InJournal, &sh->dev[i].flags)) | |
235 | injournal++; | |
a39f7afd SL |
236 | /* |
237 | * When quiesce in r5c write back, set STRIPE_HANDLE for stripes with | |
238 | * data in journal, so they are not released to cached lists | |
239 | */ | |
240 | if (conf->quiesce && r5c_is_writeback(conf->log) && | |
241 | !test_bit(STRIPE_HANDLE, &sh->state) && injournal != 0) { | |
242 | if (test_bit(STRIPE_R5C_CACHING, &sh->state)) | |
243 | r5c_make_stripe_write_out(sh); | |
244 | set_bit(STRIPE_HANDLE, &sh->state); | |
245 | } | |
1e6d690b | 246 | |
4eb788df SL |
247 | if (test_bit(STRIPE_HANDLE, &sh->state)) { |
248 | if (test_bit(STRIPE_DELAYED, &sh->state) && | |
ad3ab8b6 | 249 | !test_bit(STRIPE_PREREAD_ACTIVE, &sh->state)) |
4eb788df | 250 | list_add_tail(&sh->lru, &conf->delayed_list); |
ad3ab8b6 | 251 | else if (test_bit(STRIPE_BIT_DELAY, &sh->state) && |
4eb788df SL |
252 | sh->bm_seq - conf->seq_write > 0) |
253 | list_add_tail(&sh->lru, &conf->bitmap_list); | |
254 | else { | |
255 | clear_bit(STRIPE_DELAYED, &sh->state); | |
256 | clear_bit(STRIPE_BIT_DELAY, &sh->state); | |
851c30c9 | 257 | if (conf->worker_cnt_per_group == 0) { |
535ae4eb SL |
258 | if (stripe_is_lowprio(sh)) |
259 | list_add_tail(&sh->lru, | |
260 | &conf->loprio_list); | |
261 | else | |
262 | list_add_tail(&sh->lru, | |
263 | &conf->handle_list); | |
851c30c9 SL |
264 | } else { |
265 | raid5_wakeup_stripe_thread(sh); | |
266 | return; | |
267 | } | |
4eb788df SL |
268 | } |
269 | md_wakeup_thread(conf->mddev->thread); | |
270 | } else { | |
271 | BUG_ON(stripe_operations_active(sh)); | |
272 | if (test_and_clear_bit(STRIPE_PREREAD_ACTIVE, &sh->state)) | |
273 | if (atomic_dec_return(&conf->preread_active_stripes) | |
274 | < IO_THRESHOLD) | |
275 | md_wakeup_thread(conf->mddev->thread); | |
276 | atomic_dec(&conf->active_stripes); | |
1e6d690b SL |
277 | if (!test_bit(STRIPE_EXPANDING, &sh->state)) { |
278 | if (!r5c_is_writeback(conf->log)) | |
279 | list_add_tail(&sh->lru, temp_inactive_list); | |
280 | else { | |
281 | WARN_ON(test_bit(R5_InJournal, &sh->dev[sh->pd_idx].flags)); | |
282 | if (injournal == 0) | |
283 | list_add_tail(&sh->lru, temp_inactive_list); | |
284 | else if (injournal == conf->raid_disks - conf->max_degraded) { | |
285 | /* full stripe */ | |
286 | if (!test_and_set_bit(STRIPE_R5C_FULL_STRIPE, &sh->state)) | |
287 | atomic_inc(&conf->r5c_cached_full_stripes); | |
288 | if (test_and_clear_bit(STRIPE_R5C_PARTIAL_STRIPE, &sh->state)) | |
289 | atomic_dec(&conf->r5c_cached_partial_stripes); | |
290 | list_add_tail(&sh->lru, &conf->r5c_full_stripe_list); | |
a39f7afd | 291 | r5c_check_cached_full_stripe(conf); |
03b047f4 SL |
292 | } else |
293 | /* | |
294 | * STRIPE_R5C_PARTIAL_STRIPE is set in | |
295 | * r5c_try_caching_write(). No need to | |
296 | * set it again. | |
297 | */ | |
1e6d690b | 298 | list_add_tail(&sh->lru, &conf->r5c_partial_stripe_list); |
1e6d690b SL |
299 | } |
300 | } | |
1da177e4 LT |
301 | } |
302 | } | |
d0dabf7e | 303 | |
566c09c5 SL |
304 | static void __release_stripe(struct r5conf *conf, struct stripe_head *sh, |
305 | struct list_head *temp_inactive_list) | |
4eb788df SL |
306 | { |
307 | if (atomic_dec_and_test(&sh->count)) | |
566c09c5 SL |
308 | do_release_stripe(conf, sh, temp_inactive_list); |
309 | } | |
310 | ||
311 | /* | |
312 | * @hash could be NR_STRIPE_HASH_LOCKS, then we have a list of inactive_list | |
313 | * | |
314 | * Be careful: Only one task can add/delete stripes from temp_inactive_list at | |
315 | * given time. Adding stripes only takes device lock, while deleting stripes | |
316 | * only takes hash lock. | |
317 | */ | |
318 | static void release_inactive_stripe_list(struct r5conf *conf, | |
319 | struct list_head *temp_inactive_list, | |
320 | int hash) | |
321 | { | |
322 | int size; | |
6ab2a4b8 | 323 | bool do_wakeup = false; |
566c09c5 SL |
324 | unsigned long flags; |
325 | ||
326 | if (hash == NR_STRIPE_HASH_LOCKS) { | |
327 | size = NR_STRIPE_HASH_LOCKS; | |
328 | hash = NR_STRIPE_HASH_LOCKS - 1; | |
329 | } else | |
330 | size = 1; | |
331 | while (size) { | |
332 | struct list_head *list = &temp_inactive_list[size - 1]; | |
333 | ||
334 | /* | |
6d036f7d | 335 | * We don't hold any lock here yet, raid5_get_active_stripe() might |
566c09c5 SL |
336 | * remove stripes from the list |
337 | */ | |
338 | if (!list_empty_careful(list)) { | |
339 | spin_lock_irqsave(conf->hash_locks + hash, flags); | |
4bda556a SL |
340 | if (list_empty(conf->inactive_list + hash) && |
341 | !list_empty(list)) | |
342 | atomic_dec(&conf->empty_inactive_list_nr); | |
566c09c5 | 343 | list_splice_tail_init(list, conf->inactive_list + hash); |
6ab2a4b8 | 344 | do_wakeup = true; |
566c09c5 SL |
345 | spin_unlock_irqrestore(conf->hash_locks + hash, flags); |
346 | } | |
347 | size--; | |
348 | hash--; | |
349 | } | |
350 | ||
351 | if (do_wakeup) { | |
6ab2a4b8 | 352 | wake_up(&conf->wait_for_stripe); |
b1b46486 YL |
353 | if (atomic_read(&conf->active_stripes) == 0) |
354 | wake_up(&conf->wait_for_quiescent); | |
566c09c5 SL |
355 | if (conf->retry_read_aligned) |
356 | md_wakeup_thread(conf->mddev->thread); | |
357 | } | |
4eb788df SL |
358 | } |
359 | ||
773ca82f | 360 | /* should hold conf->device_lock already */ |
566c09c5 SL |
361 | static int release_stripe_list(struct r5conf *conf, |
362 | struct list_head *temp_inactive_list) | |
773ca82f | 363 | { |
eae8263f | 364 | struct stripe_head *sh, *t; |
773ca82f SL |
365 | int count = 0; |
366 | struct llist_node *head; | |
367 | ||
368 | head = llist_del_all(&conf->released_stripes); | |
d265d9dc | 369 | head = llist_reverse_order(head); |
eae8263f | 370 | llist_for_each_entry_safe(sh, t, head, release_list) { |
566c09c5 SL |
371 | int hash; |
372 | ||
773ca82f SL |
373 | /* sh could be readded after STRIPE_ON_RELEASE_LIST is cleard */ |
374 | smp_mb(); | |
375 | clear_bit(STRIPE_ON_RELEASE_LIST, &sh->state); | |
376 | /* | |
377 | * Don't worry the bit is set here, because if the bit is set | |
378 | * again, the count is always > 1. This is true for | |
379 | * STRIPE_ON_UNPLUG_LIST bit too. | |
380 | */ | |
566c09c5 SL |
381 | hash = sh->hash_lock_index; |
382 | __release_stripe(conf, sh, &temp_inactive_list[hash]); | |
773ca82f SL |
383 | count++; |
384 | } | |
385 | ||
386 | return count; | |
387 | } | |
388 | ||
6d036f7d | 389 | void raid5_release_stripe(struct stripe_head *sh) |
1da177e4 | 390 | { |
d1688a6d | 391 | struct r5conf *conf = sh->raid_conf; |
1da177e4 | 392 | unsigned long flags; |
566c09c5 SL |
393 | struct list_head list; |
394 | int hash; | |
773ca82f | 395 | bool wakeup; |
16a53ecc | 396 | |
cf170f3f ES |
397 | /* Avoid release_list until the last reference. |
398 | */ | |
399 | if (atomic_add_unless(&sh->count, -1, 1)) | |
400 | return; | |
401 | ||
ad4068de | 402 | if (unlikely(!conf->mddev->thread) || |
403 | test_and_set_bit(STRIPE_ON_RELEASE_LIST, &sh->state)) | |
773ca82f SL |
404 | goto slow_path; |
405 | wakeup = llist_add(&sh->release_list, &conf->released_stripes); | |
406 | if (wakeup) | |
407 | md_wakeup_thread(conf->mddev->thread); | |
408 | return; | |
409 | slow_path: | |
4eb788df | 410 | local_irq_save(flags); |
773ca82f | 411 | /* we are ok here if STRIPE_ON_RELEASE_LIST is set or not */ |
4eb788df | 412 | if (atomic_dec_and_lock(&sh->count, &conf->device_lock)) { |
566c09c5 SL |
413 | INIT_LIST_HEAD(&list); |
414 | hash = sh->hash_lock_index; | |
415 | do_release_stripe(conf, sh, &list); | |
4eb788df | 416 | spin_unlock(&conf->device_lock); |
566c09c5 | 417 | release_inactive_stripe_list(conf, &list, hash); |
4eb788df SL |
418 | } |
419 | local_irq_restore(flags); | |
1da177e4 LT |
420 | } |
421 | ||
fccddba0 | 422 | static inline void remove_hash(struct stripe_head *sh) |
1da177e4 | 423 | { |
45b4233c DW |
424 | pr_debug("remove_hash(), stripe %llu\n", |
425 | (unsigned long long)sh->sector); | |
1da177e4 | 426 | |
fccddba0 | 427 | hlist_del_init(&sh->hash); |
1da177e4 LT |
428 | } |
429 | ||
d1688a6d | 430 | static inline void insert_hash(struct r5conf *conf, struct stripe_head *sh) |
1da177e4 | 431 | { |
fccddba0 | 432 | struct hlist_head *hp = stripe_hash(conf, sh->sector); |
1da177e4 | 433 | |
45b4233c DW |
434 | pr_debug("insert_hash(), stripe %llu\n", |
435 | (unsigned long long)sh->sector); | |
1da177e4 | 436 | |
fccddba0 | 437 | hlist_add_head(&sh->hash, hp); |
1da177e4 LT |
438 | } |
439 | ||
1da177e4 | 440 | /* find an idle stripe, make sure it is unhashed, and return it. */ |
566c09c5 | 441 | static struct stripe_head *get_free_stripe(struct r5conf *conf, int hash) |
1da177e4 LT |
442 | { |
443 | struct stripe_head *sh = NULL; | |
444 | struct list_head *first; | |
445 | ||
566c09c5 | 446 | if (list_empty(conf->inactive_list + hash)) |
1da177e4 | 447 | goto out; |
566c09c5 | 448 | first = (conf->inactive_list + hash)->next; |
1da177e4 LT |
449 | sh = list_entry(first, struct stripe_head, lru); |
450 | list_del_init(first); | |
451 | remove_hash(sh); | |
452 | atomic_inc(&conf->active_stripes); | |
566c09c5 | 453 | BUG_ON(hash != sh->hash_lock_index); |
4bda556a SL |
454 | if (list_empty(conf->inactive_list + hash)) |
455 | atomic_inc(&conf->empty_inactive_list_nr); | |
1da177e4 LT |
456 | out: |
457 | return sh; | |
458 | } | |
459 | ||
e4e11e38 | 460 | static void shrink_buffers(struct stripe_head *sh) |
1da177e4 LT |
461 | { |
462 | struct page *p; | |
463 | int i; | |
e4e11e38 | 464 | int num = sh->raid_conf->pool_size; |
1da177e4 | 465 | |
e4e11e38 | 466 | for (i = 0; i < num ; i++) { |
d592a996 | 467 | WARN_ON(sh->dev[i].page != sh->dev[i].orig_page); |
1da177e4 LT |
468 | p = sh->dev[i].page; |
469 | if (!p) | |
470 | continue; | |
471 | sh->dev[i].page = NULL; | |
2d1f3b5d | 472 | put_page(p); |
1da177e4 | 473 | } |
3418d036 AP |
474 | |
475 | if (sh->ppl_page) { | |
476 | put_page(sh->ppl_page); | |
477 | sh->ppl_page = NULL; | |
478 | } | |
1da177e4 LT |
479 | } |
480 | ||
a9683a79 | 481 | static int grow_buffers(struct stripe_head *sh, gfp_t gfp) |
1da177e4 LT |
482 | { |
483 | int i; | |
e4e11e38 | 484 | int num = sh->raid_conf->pool_size; |
1da177e4 | 485 | |
e4e11e38 | 486 | for (i = 0; i < num; i++) { |
1da177e4 LT |
487 | struct page *page; |
488 | ||
a9683a79 | 489 | if (!(page = alloc_page(gfp))) { |
1da177e4 LT |
490 | return 1; |
491 | } | |
492 | sh->dev[i].page = page; | |
d592a996 | 493 | sh->dev[i].orig_page = page; |
1da177e4 | 494 | } |
3418d036 AP |
495 | |
496 | if (raid5_has_ppl(sh->raid_conf)) { | |
497 | sh->ppl_page = alloc_page(gfp); | |
498 | if (!sh->ppl_page) | |
499 | return 1; | |
500 | } | |
501 | ||
1da177e4 LT |
502 | return 0; |
503 | } | |
504 | ||
784052ec | 505 | static void raid5_build_block(struct stripe_head *sh, int i, int previous); |
d1688a6d | 506 | static void stripe_set_idx(sector_t stripe, struct r5conf *conf, int previous, |
911d4ee8 | 507 | struct stripe_head *sh); |
1da177e4 | 508 | |
b5663ba4 | 509 | static void init_stripe(struct stripe_head *sh, sector_t sector, int previous) |
1da177e4 | 510 | { |
d1688a6d | 511 | struct r5conf *conf = sh->raid_conf; |
566c09c5 | 512 | int i, seq; |
1da177e4 | 513 | |
78bafebd ES |
514 | BUG_ON(atomic_read(&sh->count) != 0); |
515 | BUG_ON(test_bit(STRIPE_HANDLE, &sh->state)); | |
600aa109 | 516 | BUG_ON(stripe_operations_active(sh)); |
59fc630b | 517 | BUG_ON(sh->batch_head); |
d84e0f10 | 518 | |
45b4233c | 519 | pr_debug("init_stripe called, stripe %llu\n", |
b8e6a15a | 520 | (unsigned long long)sector); |
566c09c5 SL |
521 | retry: |
522 | seq = read_seqcount_begin(&conf->gen_lock); | |
86b42c71 | 523 | sh->generation = conf->generation - previous; |
b5663ba4 | 524 | sh->disks = previous ? conf->previous_raid_disks : conf->raid_disks; |
1da177e4 | 525 | sh->sector = sector; |
911d4ee8 | 526 | stripe_set_idx(sector, conf, previous, sh); |
1da177e4 LT |
527 | sh->state = 0; |
528 | ||
7ecaa1e6 | 529 | for (i = sh->disks; i--; ) { |
1da177e4 LT |
530 | struct r5dev *dev = &sh->dev[i]; |
531 | ||
d84e0f10 | 532 | if (dev->toread || dev->read || dev->towrite || dev->written || |
1da177e4 | 533 | test_bit(R5_LOCKED, &dev->flags)) { |
cc6167b4 | 534 | pr_err("sector=%llx i=%d %p %p %p %p %d\n", |
1da177e4 | 535 | (unsigned long long)sh->sector, i, dev->toread, |
d84e0f10 | 536 | dev->read, dev->towrite, dev->written, |
1da177e4 | 537 | test_bit(R5_LOCKED, &dev->flags)); |
8cfa7b0f | 538 | WARN_ON(1); |
1da177e4 LT |
539 | } |
540 | dev->flags = 0; | |
784052ec | 541 | raid5_build_block(sh, i, previous); |
1da177e4 | 542 | } |
566c09c5 SL |
543 | if (read_seqcount_retry(&conf->gen_lock, seq)) |
544 | goto retry; | |
7a87f434 | 545 | sh->overwrite_disks = 0; |
1da177e4 | 546 | insert_hash(conf, sh); |
851c30c9 | 547 | sh->cpu = smp_processor_id(); |
da41ba65 | 548 | set_bit(STRIPE_BATCH_READY, &sh->state); |
1da177e4 LT |
549 | } |
550 | ||
d1688a6d | 551 | static struct stripe_head *__find_stripe(struct r5conf *conf, sector_t sector, |
86b42c71 | 552 | short generation) |
1da177e4 LT |
553 | { |
554 | struct stripe_head *sh; | |
555 | ||
45b4233c | 556 | pr_debug("__find_stripe, sector %llu\n", (unsigned long long)sector); |
b67bfe0d | 557 | hlist_for_each_entry(sh, stripe_hash(conf, sector), hash) |
86b42c71 | 558 | if (sh->sector == sector && sh->generation == generation) |
1da177e4 | 559 | return sh; |
45b4233c | 560 | pr_debug("__stripe %llu not in cache\n", (unsigned long long)sector); |
1da177e4 LT |
561 | return NULL; |
562 | } | |
563 | ||
674806d6 N |
564 | /* |
565 | * Need to check if array has failed when deciding whether to: | |
566 | * - start an array | |
567 | * - remove non-faulty devices | |
568 | * - add a spare | |
569 | * - allow a reshape | |
570 | * This determination is simple when no reshape is happening. | |
571 | * However if there is a reshape, we need to carefully check | |
572 | * both the before and after sections. | |
573 | * This is because some failed devices may only affect one | |
574 | * of the two sections, and some non-in_sync devices may | |
575 | * be insync in the section most affected by failed devices. | |
576 | */ | |
2e38a37f | 577 | int raid5_calc_degraded(struct r5conf *conf) |
674806d6 | 578 | { |
908f4fbd | 579 | int degraded, degraded2; |
674806d6 | 580 | int i; |
674806d6 N |
581 | |
582 | rcu_read_lock(); | |
583 | degraded = 0; | |
584 | for (i = 0; i < conf->previous_raid_disks; i++) { | |
3cb03002 | 585 | struct md_rdev *rdev = rcu_dereference(conf->disks[i].rdev); |
e5c86471 N |
586 | if (rdev && test_bit(Faulty, &rdev->flags)) |
587 | rdev = rcu_dereference(conf->disks[i].replacement); | |
674806d6 N |
588 | if (!rdev || test_bit(Faulty, &rdev->flags)) |
589 | degraded++; | |
590 | else if (test_bit(In_sync, &rdev->flags)) | |
591 | ; | |
592 | else | |
593 | /* not in-sync or faulty. | |
594 | * If the reshape increases the number of devices, | |
595 | * this is being recovered by the reshape, so | |
596 | * this 'previous' section is not in_sync. | |
597 | * If the number of devices is being reduced however, | |
598 | * the device can only be part of the array if | |
599 | * we are reverting a reshape, so this section will | |
600 | * be in-sync. | |
601 | */ | |
602 | if (conf->raid_disks >= conf->previous_raid_disks) | |
603 | degraded++; | |
604 | } | |
605 | rcu_read_unlock(); | |
908f4fbd N |
606 | if (conf->raid_disks == conf->previous_raid_disks) |
607 | return degraded; | |
674806d6 | 608 | rcu_read_lock(); |
908f4fbd | 609 | degraded2 = 0; |
674806d6 | 610 | for (i = 0; i < conf->raid_disks; i++) { |
3cb03002 | 611 | struct md_rdev *rdev = rcu_dereference(conf->disks[i].rdev); |
e5c86471 N |
612 | if (rdev && test_bit(Faulty, &rdev->flags)) |
613 | rdev = rcu_dereference(conf->disks[i].replacement); | |
674806d6 | 614 | if (!rdev || test_bit(Faulty, &rdev->flags)) |
908f4fbd | 615 | degraded2++; |
674806d6 N |
616 | else if (test_bit(In_sync, &rdev->flags)) |
617 | ; | |
618 | else | |
619 | /* not in-sync or faulty. | |
620 | * If reshape increases the number of devices, this | |
621 | * section has already been recovered, else it | |
622 | * almost certainly hasn't. | |
623 | */ | |
624 | if (conf->raid_disks <= conf->previous_raid_disks) | |
908f4fbd | 625 | degraded2++; |
674806d6 N |
626 | } |
627 | rcu_read_unlock(); | |
908f4fbd N |
628 | if (degraded2 > degraded) |
629 | return degraded2; | |
630 | return degraded; | |
631 | } | |
632 | ||
633 | static int has_failed(struct r5conf *conf) | |
634 | { | |
635 | int degraded; | |
636 | ||
637 | if (conf->mddev->reshape_position == MaxSector) | |
638 | return conf->mddev->degraded > conf->max_degraded; | |
639 | ||
2e38a37f | 640 | degraded = raid5_calc_degraded(conf); |
674806d6 N |
641 | if (degraded > conf->max_degraded) |
642 | return 1; | |
643 | return 0; | |
644 | } | |
645 | ||
6d036f7d SL |
646 | struct stripe_head * |
647 | raid5_get_active_stripe(struct r5conf *conf, sector_t sector, | |
648 | int previous, int noblock, int noquiesce) | |
1da177e4 LT |
649 | { |
650 | struct stripe_head *sh; | |
566c09c5 | 651 | int hash = stripe_hash_locks_hash(sector); |
ff00d3b4 | 652 | int inc_empty_inactive_list_flag; |
1da177e4 | 653 | |
45b4233c | 654 | pr_debug("get_stripe, sector %llu\n", (unsigned long long)sector); |
1da177e4 | 655 | |
566c09c5 | 656 | spin_lock_irq(conf->hash_locks + hash); |
1da177e4 LT |
657 | |
658 | do { | |
b1b46486 | 659 | wait_event_lock_irq(conf->wait_for_quiescent, |
a8c906ca | 660 | conf->quiesce == 0 || noquiesce, |
566c09c5 | 661 | *(conf->hash_locks + hash)); |
86b42c71 | 662 | sh = __find_stripe(conf, sector, conf->generation - previous); |
1da177e4 | 663 | if (!sh) { |
edbe83ab | 664 | if (!test_bit(R5_INACTIVE_BLOCKED, &conf->cache_state)) { |
566c09c5 | 665 | sh = get_free_stripe(conf, hash); |
713bc5c2 SL |
666 | if (!sh && !test_bit(R5_DID_ALLOC, |
667 | &conf->cache_state)) | |
edbe83ab N |
668 | set_bit(R5_ALLOC_MORE, |
669 | &conf->cache_state); | |
670 | } | |
1da177e4 LT |
671 | if (noblock && sh == NULL) |
672 | break; | |
a39f7afd SL |
673 | |
674 | r5c_check_stripe_cache_usage(conf); | |
1da177e4 | 675 | if (!sh) { |
5423399a N |
676 | set_bit(R5_INACTIVE_BLOCKED, |
677 | &conf->cache_state); | |
a39f7afd | 678 | r5l_wake_reclaim(conf->log, 0); |
6ab2a4b8 SL |
679 | wait_event_lock_irq( |
680 | conf->wait_for_stripe, | |
566c09c5 SL |
681 | !list_empty(conf->inactive_list + hash) && |
682 | (atomic_read(&conf->active_stripes) | |
683 | < (conf->max_nr_stripes * 3 / 4) | |
5423399a N |
684 | || !test_bit(R5_INACTIVE_BLOCKED, |
685 | &conf->cache_state)), | |
6ab2a4b8 | 686 | *(conf->hash_locks + hash)); |
5423399a N |
687 | clear_bit(R5_INACTIVE_BLOCKED, |
688 | &conf->cache_state); | |
7da9d450 | 689 | } else { |
b5663ba4 | 690 | init_stripe(sh, sector, previous); |
7da9d450 N |
691 | atomic_inc(&sh->count); |
692 | } | |
e240c183 | 693 | } else if (!atomic_inc_not_zero(&sh->count)) { |
6d183de4 | 694 | spin_lock(&conf->device_lock); |
e240c183 | 695 | if (!atomic_read(&sh->count)) { |
1da177e4 LT |
696 | if (!test_bit(STRIPE_HANDLE, &sh->state)) |
697 | atomic_inc(&conf->active_stripes); | |
5af9bef7 N |
698 | BUG_ON(list_empty(&sh->lru) && |
699 | !test_bit(STRIPE_EXPANDING, &sh->state)); | |
ff00d3b4 ZL |
700 | inc_empty_inactive_list_flag = 0; |
701 | if (!list_empty(conf->inactive_list + hash)) | |
702 | inc_empty_inactive_list_flag = 1; | |
16a53ecc | 703 | list_del_init(&sh->lru); |
ff00d3b4 ZL |
704 | if (list_empty(conf->inactive_list + hash) && inc_empty_inactive_list_flag) |
705 | atomic_inc(&conf->empty_inactive_list_nr); | |
bfc90cb0 SL |
706 | if (sh->group) { |
707 | sh->group->stripes_cnt--; | |
708 | sh->group = NULL; | |
709 | } | |
1da177e4 | 710 | } |
7da9d450 | 711 | atomic_inc(&sh->count); |
6d183de4 | 712 | spin_unlock(&conf->device_lock); |
1da177e4 LT |
713 | } |
714 | } while (sh == NULL); | |
715 | ||
566c09c5 | 716 | spin_unlock_irq(conf->hash_locks + hash); |
1da177e4 LT |
717 | return sh; |
718 | } | |
719 | ||
7a87f434 | 720 | static bool is_full_stripe_write(struct stripe_head *sh) |
721 | { | |
722 | BUG_ON(sh->overwrite_disks > (sh->disks - sh->raid_conf->max_degraded)); | |
723 | return sh->overwrite_disks == (sh->disks - sh->raid_conf->max_degraded); | |
724 | } | |
725 | ||
59fc630b | 726 | static void lock_two_stripes(struct stripe_head *sh1, struct stripe_head *sh2) |
727 | { | |
728 | local_irq_disable(); | |
729 | if (sh1 > sh2) { | |
730 | spin_lock(&sh2->stripe_lock); | |
731 | spin_lock_nested(&sh1->stripe_lock, 1); | |
732 | } else { | |
733 | spin_lock(&sh1->stripe_lock); | |
734 | spin_lock_nested(&sh2->stripe_lock, 1); | |
735 | } | |
736 | } | |
737 | ||
738 | static void unlock_two_stripes(struct stripe_head *sh1, struct stripe_head *sh2) | |
739 | { | |
740 | spin_unlock(&sh1->stripe_lock); | |
741 | spin_unlock(&sh2->stripe_lock); | |
742 | local_irq_enable(); | |
743 | } | |
744 | ||
745 | /* Only freshly new full stripe normal write stripe can be added to a batch list */ | |
746 | static bool stripe_can_batch(struct stripe_head *sh) | |
747 | { | |
9c3e333d SL |
748 | struct r5conf *conf = sh->raid_conf; |
749 | ||
3418d036 | 750 | if (conf->log || raid5_has_ppl(conf)) |
9c3e333d | 751 | return false; |
59fc630b | 752 | return test_bit(STRIPE_BATCH_READY, &sh->state) && |
d0852df5 | 753 | !test_bit(STRIPE_BITMAP_PENDING, &sh->state) && |
59fc630b | 754 | is_full_stripe_write(sh); |
755 | } | |
756 | ||
757 | /* we only do back search */ | |
758 | static void stripe_add_to_batch_list(struct r5conf *conf, struct stripe_head *sh) | |
759 | { | |
760 | struct stripe_head *head; | |
761 | sector_t head_sector, tmp_sec; | |
762 | int hash; | |
763 | int dd_idx; | |
ff00d3b4 | 764 | int inc_empty_inactive_list_flag; |
59fc630b | 765 | |
59fc630b | 766 | /* Don't cross chunks, so stripe pd_idx/qd_idx is the same */ |
767 | tmp_sec = sh->sector; | |
768 | if (!sector_div(tmp_sec, conf->chunk_sectors)) | |
769 | return; | |
770 | head_sector = sh->sector - STRIPE_SECTORS; | |
771 | ||
772 | hash = stripe_hash_locks_hash(head_sector); | |
773 | spin_lock_irq(conf->hash_locks + hash); | |
774 | head = __find_stripe(conf, head_sector, conf->generation); | |
775 | if (head && !atomic_inc_not_zero(&head->count)) { | |
776 | spin_lock(&conf->device_lock); | |
777 | if (!atomic_read(&head->count)) { | |
778 | if (!test_bit(STRIPE_HANDLE, &head->state)) | |
779 | atomic_inc(&conf->active_stripes); | |
780 | BUG_ON(list_empty(&head->lru) && | |
781 | !test_bit(STRIPE_EXPANDING, &head->state)); | |
ff00d3b4 ZL |
782 | inc_empty_inactive_list_flag = 0; |
783 | if (!list_empty(conf->inactive_list + hash)) | |
784 | inc_empty_inactive_list_flag = 1; | |
59fc630b | 785 | list_del_init(&head->lru); |
ff00d3b4 ZL |
786 | if (list_empty(conf->inactive_list + hash) && inc_empty_inactive_list_flag) |
787 | atomic_inc(&conf->empty_inactive_list_nr); | |
59fc630b | 788 | if (head->group) { |
789 | head->group->stripes_cnt--; | |
790 | head->group = NULL; | |
791 | } | |
792 | } | |
793 | atomic_inc(&head->count); | |
794 | spin_unlock(&conf->device_lock); | |
795 | } | |
796 | spin_unlock_irq(conf->hash_locks + hash); | |
797 | ||
798 | if (!head) | |
799 | return; | |
800 | if (!stripe_can_batch(head)) | |
801 | goto out; | |
802 | ||
803 | lock_two_stripes(head, sh); | |
804 | /* clear_batch_ready clear the flag */ | |
805 | if (!stripe_can_batch(head) || !stripe_can_batch(sh)) | |
806 | goto unlock_out; | |
807 | ||
808 | if (sh->batch_head) | |
809 | goto unlock_out; | |
810 | ||
811 | dd_idx = 0; | |
812 | while (dd_idx == sh->pd_idx || dd_idx == sh->qd_idx) | |
813 | dd_idx++; | |
1eff9d32 | 814 | if (head->dev[dd_idx].towrite->bi_opf != sh->dev[dd_idx].towrite->bi_opf || |
796a5cf0 | 815 | bio_op(head->dev[dd_idx].towrite) != bio_op(sh->dev[dd_idx].towrite)) |
59fc630b | 816 | goto unlock_out; |
817 | ||
818 | if (head->batch_head) { | |
819 | spin_lock(&head->batch_head->batch_lock); | |
820 | /* This batch list is already running */ | |
821 | if (!stripe_can_batch(head)) { | |
822 | spin_unlock(&head->batch_head->batch_lock); | |
823 | goto unlock_out; | |
824 | } | |
825 | ||
826 | /* | |
827 | * at this point, head's BATCH_READY could be cleared, but we | |
828 | * can still add the stripe to batch list | |
829 | */ | |
830 | list_add(&sh->batch_list, &head->batch_list); | |
831 | spin_unlock(&head->batch_head->batch_lock); | |
832 | ||
833 | sh->batch_head = head->batch_head; | |
834 | } else { | |
835 | head->batch_head = head; | |
836 | sh->batch_head = head->batch_head; | |
837 | spin_lock(&head->batch_lock); | |
838 | list_add_tail(&sh->batch_list, &head->batch_list); | |
839 | spin_unlock(&head->batch_lock); | |
840 | } | |
841 | ||
842 | if (test_and_clear_bit(STRIPE_PREREAD_ACTIVE, &sh->state)) | |
843 | if (atomic_dec_return(&conf->preread_active_stripes) | |
844 | < IO_THRESHOLD) | |
845 | md_wakeup_thread(conf->mddev->thread); | |
846 | ||
2b6b2457 N |
847 | if (test_and_clear_bit(STRIPE_BIT_DELAY, &sh->state)) { |
848 | int seq = sh->bm_seq; | |
849 | if (test_bit(STRIPE_BIT_DELAY, &sh->batch_head->state) && | |
850 | sh->batch_head->bm_seq > seq) | |
851 | seq = sh->batch_head->bm_seq; | |
852 | set_bit(STRIPE_BIT_DELAY, &sh->batch_head->state); | |
853 | sh->batch_head->bm_seq = seq; | |
854 | } | |
855 | ||
59fc630b | 856 | atomic_inc(&sh->count); |
857 | unlock_out: | |
858 | unlock_two_stripes(head, sh); | |
859 | out: | |
6d036f7d | 860 | raid5_release_stripe(head); |
59fc630b | 861 | } |
862 | ||
05616be5 N |
863 | /* Determine if 'data_offset' or 'new_data_offset' should be used |
864 | * in this stripe_head. | |
865 | */ | |
866 | static int use_new_offset(struct r5conf *conf, struct stripe_head *sh) | |
867 | { | |
868 | sector_t progress = conf->reshape_progress; | |
869 | /* Need a memory barrier to make sure we see the value | |
870 | * of conf->generation, or ->data_offset that was set before | |
871 | * reshape_progress was updated. | |
872 | */ | |
873 | smp_rmb(); | |
874 | if (progress == MaxSector) | |
875 | return 0; | |
876 | if (sh->generation == conf->generation - 1) | |
877 | return 0; | |
878 | /* We are in a reshape, and this is a new-generation stripe, | |
879 | * so use new_data_offset. | |
880 | */ | |
881 | return 1; | |
882 | } | |
883 | ||
aaf9f12e | 884 | static void dispatch_bio_list(struct bio_list *tmp) |
765d704d | 885 | { |
765d704d SL |
886 | struct bio *bio; |
887 | ||
aaf9f12e SL |
888 | while ((bio = bio_list_pop(tmp))) |
889 | generic_make_request(bio); | |
890 | } | |
891 | ||
892 | static int cmp_stripe(void *priv, struct list_head *a, struct list_head *b) | |
893 | { | |
894 | const struct r5pending_data *da = list_entry(a, | |
895 | struct r5pending_data, sibling); | |
896 | const struct r5pending_data *db = list_entry(b, | |
897 | struct r5pending_data, sibling); | |
898 | if (da->sector > db->sector) | |
899 | return 1; | |
900 | if (da->sector < db->sector) | |
901 | return -1; | |
902 | return 0; | |
903 | } | |
904 | ||
905 | static void dispatch_defer_bios(struct r5conf *conf, int target, | |
906 | struct bio_list *list) | |
907 | { | |
908 | struct r5pending_data *data; | |
909 | struct list_head *first, *next = NULL; | |
910 | int cnt = 0; | |
911 | ||
912 | if (conf->pending_data_cnt == 0) | |
913 | return; | |
914 | ||
915 | list_sort(NULL, &conf->pending_list, cmp_stripe); | |
916 | ||
917 | first = conf->pending_list.next; | |
918 | ||
919 | /* temporarily move the head */ | |
920 | if (conf->next_pending_data) | |
921 | list_move_tail(&conf->pending_list, | |
922 | &conf->next_pending_data->sibling); | |
923 | ||
924 | while (!list_empty(&conf->pending_list)) { | |
925 | data = list_first_entry(&conf->pending_list, | |
926 | struct r5pending_data, sibling); | |
927 | if (&data->sibling == first) | |
928 | first = data->sibling.next; | |
929 | next = data->sibling.next; | |
930 | ||
931 | bio_list_merge(list, &data->bios); | |
932 | list_move(&data->sibling, &conf->free_list); | |
933 | cnt++; | |
934 | if (cnt >= target) | |
935 | break; | |
936 | } | |
937 | conf->pending_data_cnt -= cnt; | |
938 | BUG_ON(conf->pending_data_cnt < 0 || cnt < target); | |
939 | ||
940 | if (next != &conf->pending_list) | |
941 | conf->next_pending_data = list_entry(next, | |
942 | struct r5pending_data, sibling); | |
943 | else | |
944 | conf->next_pending_data = NULL; | |
945 | /* list isn't empty */ | |
946 | if (first != &conf->pending_list) | |
947 | list_move_tail(&conf->pending_list, first); | |
948 | } | |
949 | ||
950 | static void flush_deferred_bios(struct r5conf *conf) | |
951 | { | |
952 | struct bio_list tmp = BIO_EMPTY_LIST; | |
953 | ||
954 | if (conf->pending_data_cnt == 0) | |
765d704d SL |
955 | return; |
956 | ||
765d704d | 957 | spin_lock(&conf->pending_bios_lock); |
aaf9f12e SL |
958 | dispatch_defer_bios(conf, conf->pending_data_cnt, &tmp); |
959 | BUG_ON(conf->pending_data_cnt != 0); | |
765d704d SL |
960 | spin_unlock(&conf->pending_bios_lock); |
961 | ||
aaf9f12e | 962 | dispatch_bio_list(&tmp); |
765d704d SL |
963 | } |
964 | ||
aaf9f12e SL |
965 | static void defer_issue_bios(struct r5conf *conf, sector_t sector, |
966 | struct bio_list *bios) | |
765d704d | 967 | { |
aaf9f12e SL |
968 | struct bio_list tmp = BIO_EMPTY_LIST; |
969 | struct r5pending_data *ent; | |
970 | ||
765d704d | 971 | spin_lock(&conf->pending_bios_lock); |
aaf9f12e SL |
972 | ent = list_first_entry(&conf->free_list, struct r5pending_data, |
973 | sibling); | |
974 | list_move_tail(&ent->sibling, &conf->pending_list); | |
975 | ent->sector = sector; | |
976 | bio_list_init(&ent->bios); | |
977 | bio_list_merge(&ent->bios, bios); | |
978 | conf->pending_data_cnt++; | |
979 | if (conf->pending_data_cnt >= PENDING_IO_MAX) | |
980 | dispatch_defer_bios(conf, PENDING_IO_ONE_FLUSH, &tmp); | |
981 | ||
765d704d | 982 | spin_unlock(&conf->pending_bios_lock); |
aaf9f12e SL |
983 | |
984 | dispatch_bio_list(&tmp); | |
765d704d SL |
985 | } |
986 | ||
6712ecf8 | 987 | static void |
4246a0b6 | 988 | raid5_end_read_request(struct bio *bi); |
6712ecf8 | 989 | static void |
4246a0b6 | 990 | raid5_end_write_request(struct bio *bi); |
91c00924 | 991 | |
c4e5ac0a | 992 | static void ops_run_io(struct stripe_head *sh, struct stripe_head_state *s) |
91c00924 | 993 | { |
d1688a6d | 994 | struct r5conf *conf = sh->raid_conf; |
91c00924 | 995 | int i, disks = sh->disks; |
59fc630b | 996 | struct stripe_head *head_sh = sh; |
aaf9f12e SL |
997 | struct bio_list pending_bios = BIO_EMPTY_LIST; |
998 | bool should_defer; | |
91c00924 DW |
999 | |
1000 | might_sleep(); | |
1001 | ||
ff875738 AP |
1002 | if (log_stripe(sh, s) == 0) |
1003 | return; | |
1e6d690b | 1004 | |
aaf9f12e SL |
1005 | should_defer = conf->batch_bio_dispatch && conf->group_cnt; |
1006 | ||
91c00924 | 1007 | for (i = disks; i--; ) { |
796a5cf0 | 1008 | int op, op_flags = 0; |
9a3e1101 | 1009 | int replace_only = 0; |
977df362 N |
1010 | struct bio *bi, *rbi; |
1011 | struct md_rdev *rdev, *rrdev = NULL; | |
59fc630b | 1012 | |
1013 | sh = head_sh; | |
e9c7469b | 1014 | if (test_and_clear_bit(R5_Wantwrite, &sh->dev[i].flags)) { |
796a5cf0 | 1015 | op = REQ_OP_WRITE; |
e9c7469b | 1016 | if (test_and_clear_bit(R5_WantFUA, &sh->dev[i].flags)) |
70fd7614 | 1017 | op_flags = REQ_FUA; |
9e444768 | 1018 | if (test_bit(R5_Discard, &sh->dev[i].flags)) |
796a5cf0 | 1019 | op = REQ_OP_DISCARD; |
e9c7469b | 1020 | } else if (test_and_clear_bit(R5_Wantread, &sh->dev[i].flags)) |
796a5cf0 | 1021 | op = REQ_OP_READ; |
9a3e1101 N |
1022 | else if (test_and_clear_bit(R5_WantReplace, |
1023 | &sh->dev[i].flags)) { | |
796a5cf0 | 1024 | op = REQ_OP_WRITE; |
9a3e1101 N |
1025 | replace_only = 1; |
1026 | } else | |
91c00924 | 1027 | continue; |
bc0934f0 | 1028 | if (test_and_clear_bit(R5_SyncIO, &sh->dev[i].flags)) |
796a5cf0 | 1029 | op_flags |= REQ_SYNC; |
91c00924 | 1030 | |
59fc630b | 1031 | again: |
91c00924 | 1032 | bi = &sh->dev[i].req; |
977df362 | 1033 | rbi = &sh->dev[i].rreq; /* For writing to replacement */ |
91c00924 | 1034 | |
91c00924 | 1035 | rcu_read_lock(); |
9a3e1101 | 1036 | rrdev = rcu_dereference(conf->disks[i].replacement); |
dd054fce N |
1037 | smp_mb(); /* Ensure that if rrdev is NULL, rdev won't be */ |
1038 | rdev = rcu_dereference(conf->disks[i].rdev); | |
1039 | if (!rdev) { | |
1040 | rdev = rrdev; | |
1041 | rrdev = NULL; | |
1042 | } | |
796a5cf0 | 1043 | if (op_is_write(op)) { |
9a3e1101 N |
1044 | if (replace_only) |
1045 | rdev = NULL; | |
dd054fce N |
1046 | if (rdev == rrdev) |
1047 | /* We raced and saw duplicates */ | |
1048 | rrdev = NULL; | |
9a3e1101 | 1049 | } else { |
59fc630b | 1050 | if (test_bit(R5_ReadRepl, &head_sh->dev[i].flags) && rrdev) |
9a3e1101 N |
1051 | rdev = rrdev; |
1052 | rrdev = NULL; | |
1053 | } | |
977df362 | 1054 | |
91c00924 DW |
1055 | if (rdev && test_bit(Faulty, &rdev->flags)) |
1056 | rdev = NULL; | |
1057 | if (rdev) | |
1058 | atomic_inc(&rdev->nr_pending); | |
977df362 N |
1059 | if (rrdev && test_bit(Faulty, &rrdev->flags)) |
1060 | rrdev = NULL; | |
1061 | if (rrdev) | |
1062 | atomic_inc(&rrdev->nr_pending); | |
91c00924 DW |
1063 | rcu_read_unlock(); |
1064 | ||
73e92e51 | 1065 | /* We have already checked bad blocks for reads. Now |
977df362 N |
1066 | * need to check for writes. We never accept write errors |
1067 | * on the replacement, so we don't to check rrdev. | |
73e92e51 | 1068 | */ |
796a5cf0 | 1069 | while (op_is_write(op) && rdev && |
73e92e51 N |
1070 | test_bit(WriteErrorSeen, &rdev->flags)) { |
1071 | sector_t first_bad; | |
1072 | int bad_sectors; | |
1073 | int bad = is_badblock(rdev, sh->sector, STRIPE_SECTORS, | |
1074 | &first_bad, &bad_sectors); | |
1075 | if (!bad) | |
1076 | break; | |
1077 | ||
1078 | if (bad < 0) { | |
1079 | set_bit(BlockedBadBlocks, &rdev->flags); | |
1080 | if (!conf->mddev->external && | |
2953079c | 1081 | conf->mddev->sb_flags) { |
73e92e51 N |
1082 | /* It is very unlikely, but we might |
1083 | * still need to write out the | |
1084 | * bad block log - better give it | |
1085 | * a chance*/ | |
1086 | md_check_recovery(conf->mddev); | |
1087 | } | |
1850753d | 1088 | /* |
1089 | * Because md_wait_for_blocked_rdev | |
1090 | * will dec nr_pending, we must | |
1091 | * increment it first. | |
1092 | */ | |
1093 | atomic_inc(&rdev->nr_pending); | |
73e92e51 N |
1094 | md_wait_for_blocked_rdev(rdev, conf->mddev); |
1095 | } else { | |
1096 | /* Acknowledged bad block - skip the write */ | |
1097 | rdev_dec_pending(rdev, conf->mddev); | |
1098 | rdev = NULL; | |
1099 | } | |
1100 | } | |
1101 | ||
91c00924 | 1102 | if (rdev) { |
9a3e1101 N |
1103 | if (s->syncing || s->expanding || s->expanded |
1104 | || s->replacing) | |
91c00924 DW |
1105 | md_sync_acct(rdev->bdev, STRIPE_SECTORS); |
1106 | ||
2b7497f0 DW |
1107 | set_bit(STRIPE_IO_STARTED, &sh->state); |
1108 | ||
91c00924 | 1109 | bi->bi_bdev = rdev->bdev; |
796a5cf0 MC |
1110 | bio_set_op_attrs(bi, op, op_flags); |
1111 | bi->bi_end_io = op_is_write(op) | |
2f6db2a7 KO |
1112 | ? raid5_end_write_request |
1113 | : raid5_end_read_request; | |
1114 | bi->bi_private = sh; | |
1115 | ||
6296b960 | 1116 | pr_debug("%s: for %llu schedule op %d on disc %d\n", |
e46b272b | 1117 | __func__, (unsigned long long)sh->sector, |
1eff9d32 | 1118 | bi->bi_opf, i); |
91c00924 | 1119 | atomic_inc(&sh->count); |
59fc630b | 1120 | if (sh != head_sh) |
1121 | atomic_inc(&head_sh->count); | |
05616be5 | 1122 | if (use_new_offset(conf, sh)) |
4f024f37 | 1123 | bi->bi_iter.bi_sector = (sh->sector |
05616be5 N |
1124 | + rdev->new_data_offset); |
1125 | else | |
4f024f37 | 1126 | bi->bi_iter.bi_sector = (sh->sector |
05616be5 | 1127 | + rdev->data_offset); |
59fc630b | 1128 | if (test_bit(R5_ReadNoMerge, &head_sh->dev[i].flags)) |
1eff9d32 | 1129 | bi->bi_opf |= REQ_NOMERGE; |
3f9e7c14 | 1130 | |
d592a996 SL |
1131 | if (test_bit(R5_SkipCopy, &sh->dev[i].flags)) |
1132 | WARN_ON(test_bit(R5_UPTODATE, &sh->dev[i].flags)); | |
86aa1397 SL |
1133 | |
1134 | if (!op_is_write(op) && | |
1135 | test_bit(R5_InJournal, &sh->dev[i].flags)) | |
1136 | /* | |
1137 | * issuing read for a page in journal, this | |
1138 | * must be preparing for prexor in rmw; read | |
1139 | * the data into orig_page | |
1140 | */ | |
1141 | sh->dev[i].vec.bv_page = sh->dev[i].orig_page; | |
1142 | else | |
1143 | sh->dev[i].vec.bv_page = sh->dev[i].page; | |
4997b72e | 1144 | bi->bi_vcnt = 1; |
91c00924 DW |
1145 | bi->bi_io_vec[0].bv_len = STRIPE_SIZE; |
1146 | bi->bi_io_vec[0].bv_offset = 0; | |
4f024f37 | 1147 | bi->bi_iter.bi_size = STRIPE_SIZE; |
37c61ff3 SL |
1148 | /* |
1149 | * If this is discard request, set bi_vcnt 0. We don't | |
1150 | * want to confuse SCSI because SCSI will replace payload | |
1151 | */ | |
796a5cf0 | 1152 | if (op == REQ_OP_DISCARD) |
37c61ff3 | 1153 | bi->bi_vcnt = 0; |
977df362 N |
1154 | if (rrdev) |
1155 | set_bit(R5_DOUBLE_LOCKED, &sh->dev[i].flags); | |
e3620a3a JB |
1156 | |
1157 | if (conf->mddev->gendisk) | |
1158 | trace_block_bio_remap(bdev_get_queue(bi->bi_bdev), | |
1159 | bi, disk_devt(conf->mddev->gendisk), | |
1160 | sh->dev[i].sector); | |
aaf9f12e SL |
1161 | if (should_defer && op_is_write(op)) |
1162 | bio_list_add(&pending_bios, bi); | |
1163 | else | |
1164 | generic_make_request(bi); | |
977df362 N |
1165 | } |
1166 | if (rrdev) { | |
9a3e1101 N |
1167 | if (s->syncing || s->expanding || s->expanded |
1168 | || s->replacing) | |
977df362 N |
1169 | md_sync_acct(rrdev->bdev, STRIPE_SECTORS); |
1170 | ||
1171 | set_bit(STRIPE_IO_STARTED, &sh->state); | |
1172 | ||
1173 | rbi->bi_bdev = rrdev->bdev; | |
796a5cf0 MC |
1174 | bio_set_op_attrs(rbi, op, op_flags); |
1175 | BUG_ON(!op_is_write(op)); | |
2f6db2a7 KO |
1176 | rbi->bi_end_io = raid5_end_write_request; |
1177 | rbi->bi_private = sh; | |
1178 | ||
6296b960 | 1179 | pr_debug("%s: for %llu schedule op %d on " |
977df362 N |
1180 | "replacement disc %d\n", |
1181 | __func__, (unsigned long long)sh->sector, | |
1eff9d32 | 1182 | rbi->bi_opf, i); |
977df362 | 1183 | atomic_inc(&sh->count); |
59fc630b | 1184 | if (sh != head_sh) |
1185 | atomic_inc(&head_sh->count); | |
05616be5 | 1186 | if (use_new_offset(conf, sh)) |
4f024f37 | 1187 | rbi->bi_iter.bi_sector = (sh->sector |
05616be5 N |
1188 | + rrdev->new_data_offset); |
1189 | else | |
4f024f37 | 1190 | rbi->bi_iter.bi_sector = (sh->sector |
05616be5 | 1191 | + rrdev->data_offset); |
d592a996 SL |
1192 | if (test_bit(R5_SkipCopy, &sh->dev[i].flags)) |
1193 | WARN_ON(test_bit(R5_UPTODATE, &sh->dev[i].flags)); | |
1194 | sh->dev[i].rvec.bv_page = sh->dev[i].page; | |
4997b72e | 1195 | rbi->bi_vcnt = 1; |
977df362 N |
1196 | rbi->bi_io_vec[0].bv_len = STRIPE_SIZE; |
1197 | rbi->bi_io_vec[0].bv_offset = 0; | |
4f024f37 | 1198 | rbi->bi_iter.bi_size = STRIPE_SIZE; |
37c61ff3 SL |
1199 | /* |
1200 | * If this is discard request, set bi_vcnt 0. We don't | |
1201 | * want to confuse SCSI because SCSI will replace payload | |
1202 | */ | |
796a5cf0 | 1203 | if (op == REQ_OP_DISCARD) |
37c61ff3 | 1204 | rbi->bi_vcnt = 0; |
e3620a3a JB |
1205 | if (conf->mddev->gendisk) |
1206 | trace_block_bio_remap(bdev_get_queue(rbi->bi_bdev), | |
1207 | rbi, disk_devt(conf->mddev->gendisk), | |
1208 | sh->dev[i].sector); | |
aaf9f12e SL |
1209 | if (should_defer && op_is_write(op)) |
1210 | bio_list_add(&pending_bios, rbi); | |
1211 | else | |
1212 | generic_make_request(rbi); | |
977df362 N |
1213 | } |
1214 | if (!rdev && !rrdev) { | |
796a5cf0 | 1215 | if (op_is_write(op)) |
91c00924 | 1216 | set_bit(STRIPE_DEGRADED, &sh->state); |
6296b960 | 1217 | pr_debug("skip op %d on disc %d for sector %llu\n", |
1eff9d32 | 1218 | bi->bi_opf, i, (unsigned long long)sh->sector); |
91c00924 DW |
1219 | clear_bit(R5_LOCKED, &sh->dev[i].flags); |
1220 | set_bit(STRIPE_HANDLE, &sh->state); | |
1221 | } | |
59fc630b | 1222 | |
1223 | if (!head_sh->batch_head) | |
1224 | continue; | |
1225 | sh = list_first_entry(&sh->batch_list, struct stripe_head, | |
1226 | batch_list); | |
1227 | if (sh != head_sh) | |
1228 | goto again; | |
91c00924 | 1229 | } |
aaf9f12e SL |
1230 | |
1231 | if (should_defer && !bio_list_empty(&pending_bios)) | |
1232 | defer_issue_bios(conf, head_sh->sector, &pending_bios); | |
91c00924 DW |
1233 | } |
1234 | ||
1235 | static struct dma_async_tx_descriptor * | |
d592a996 SL |
1236 | async_copy_data(int frombio, struct bio *bio, struct page **page, |
1237 | sector_t sector, struct dma_async_tx_descriptor *tx, | |
1e6d690b | 1238 | struct stripe_head *sh, int no_skipcopy) |
91c00924 | 1239 | { |
7988613b KO |
1240 | struct bio_vec bvl; |
1241 | struct bvec_iter iter; | |
91c00924 | 1242 | struct page *bio_page; |
91c00924 | 1243 | int page_offset; |
a08abd8c | 1244 | struct async_submit_ctl submit; |
0403e382 | 1245 | enum async_tx_flags flags = 0; |
91c00924 | 1246 | |
4f024f37 KO |
1247 | if (bio->bi_iter.bi_sector >= sector) |
1248 | page_offset = (signed)(bio->bi_iter.bi_sector - sector) * 512; | |
91c00924 | 1249 | else |
4f024f37 | 1250 | page_offset = (signed)(sector - bio->bi_iter.bi_sector) * -512; |
a08abd8c | 1251 | |
0403e382 DW |
1252 | if (frombio) |
1253 | flags |= ASYNC_TX_FENCE; | |
1254 | init_async_submit(&submit, flags, tx, NULL, NULL, NULL); | |
1255 | ||
7988613b KO |
1256 | bio_for_each_segment(bvl, bio, iter) { |
1257 | int len = bvl.bv_len; | |
91c00924 DW |
1258 | int clen; |
1259 | int b_offset = 0; | |
1260 | ||
1261 | if (page_offset < 0) { | |
1262 | b_offset = -page_offset; | |
1263 | page_offset += b_offset; | |
1264 | len -= b_offset; | |
1265 | } | |
1266 | ||
1267 | if (len > 0 && page_offset + len > STRIPE_SIZE) | |
1268 | clen = STRIPE_SIZE - page_offset; | |
1269 | else | |
1270 | clen = len; | |
1271 | ||
1272 | if (clen > 0) { | |
7988613b KO |
1273 | b_offset += bvl.bv_offset; |
1274 | bio_page = bvl.bv_page; | |
d592a996 SL |
1275 | if (frombio) { |
1276 | if (sh->raid_conf->skip_copy && | |
1277 | b_offset == 0 && page_offset == 0 && | |
1e6d690b SL |
1278 | clen == STRIPE_SIZE && |
1279 | !no_skipcopy) | |
d592a996 SL |
1280 | *page = bio_page; |
1281 | else | |
1282 | tx = async_memcpy(*page, bio_page, page_offset, | |
a08abd8c | 1283 | b_offset, clen, &submit); |
d592a996 SL |
1284 | } else |
1285 | tx = async_memcpy(bio_page, *page, b_offset, | |
a08abd8c | 1286 | page_offset, clen, &submit); |
91c00924 | 1287 | } |
a08abd8c DW |
1288 | /* chain the operations */ |
1289 | submit.depend_tx = tx; | |
1290 | ||
91c00924 DW |
1291 | if (clen < len) /* hit end of page */ |
1292 | break; | |
1293 | page_offset += len; | |
1294 | } | |
1295 | ||
1296 | return tx; | |
1297 | } | |
1298 | ||
1299 | static void ops_complete_biofill(void *stripe_head_ref) | |
1300 | { | |
1301 | struct stripe_head *sh = stripe_head_ref; | |
e4d84909 | 1302 | int i; |
91c00924 | 1303 | |
e46b272b | 1304 | pr_debug("%s: stripe %llu\n", __func__, |
91c00924 DW |
1305 | (unsigned long long)sh->sector); |
1306 | ||
1307 | /* clear completed biofills */ | |
1308 | for (i = sh->disks; i--; ) { | |
1309 | struct r5dev *dev = &sh->dev[i]; | |
91c00924 DW |
1310 | |
1311 | /* acknowledge completion of a biofill operation */ | |
e4d84909 DW |
1312 | /* and check if we need to reply to a read request, |
1313 | * new R5_Wantfill requests are held off until | |
83de75cc | 1314 | * !STRIPE_BIOFILL_RUN |
e4d84909 DW |
1315 | */ |
1316 | if (test_and_clear_bit(R5_Wantfill, &dev->flags)) { | |
91c00924 | 1317 | struct bio *rbi, *rbi2; |
91c00924 | 1318 | |
91c00924 DW |
1319 | BUG_ON(!dev->read); |
1320 | rbi = dev->read; | |
1321 | dev->read = NULL; | |
4f024f37 | 1322 | while (rbi && rbi->bi_iter.bi_sector < |
91c00924 DW |
1323 | dev->sector + STRIPE_SECTORS) { |
1324 | rbi2 = r5_next_bio(rbi, dev->sector); | |
34a6f80e | 1325 | if (!raid5_dec_bi_active_stripes(rbi)) |
bd83d0a2 | 1326 | bio_endio(rbi); |
91c00924 DW |
1327 | rbi = rbi2; |
1328 | } | |
1329 | } | |
1330 | } | |
83de75cc | 1331 | clear_bit(STRIPE_BIOFILL_RUN, &sh->state); |
91c00924 | 1332 | |
e4d84909 | 1333 | set_bit(STRIPE_HANDLE, &sh->state); |
6d036f7d | 1334 | raid5_release_stripe(sh); |
91c00924 DW |
1335 | } |
1336 | ||
1337 | static void ops_run_biofill(struct stripe_head *sh) | |
1338 | { | |
1339 | struct dma_async_tx_descriptor *tx = NULL; | |
a08abd8c | 1340 | struct async_submit_ctl submit; |
91c00924 DW |
1341 | int i; |
1342 | ||
59fc630b | 1343 | BUG_ON(sh->batch_head); |
e46b272b | 1344 | pr_debug("%s: stripe %llu\n", __func__, |
91c00924 DW |
1345 | (unsigned long long)sh->sector); |
1346 | ||
1347 | for (i = sh->disks; i--; ) { | |
1348 | struct r5dev *dev = &sh->dev[i]; | |
1349 | if (test_bit(R5_Wantfill, &dev->flags)) { | |
1350 | struct bio *rbi; | |
b17459c0 | 1351 | spin_lock_irq(&sh->stripe_lock); |
91c00924 DW |
1352 | dev->read = rbi = dev->toread; |
1353 | dev->toread = NULL; | |
b17459c0 | 1354 | spin_unlock_irq(&sh->stripe_lock); |
4f024f37 | 1355 | while (rbi && rbi->bi_iter.bi_sector < |
91c00924 | 1356 | dev->sector + STRIPE_SECTORS) { |
d592a996 | 1357 | tx = async_copy_data(0, rbi, &dev->page, |
1e6d690b | 1358 | dev->sector, tx, sh, 0); |
91c00924 DW |
1359 | rbi = r5_next_bio(rbi, dev->sector); |
1360 | } | |
1361 | } | |
1362 | } | |
1363 | ||
1364 | atomic_inc(&sh->count); | |
a08abd8c DW |
1365 | init_async_submit(&submit, ASYNC_TX_ACK, tx, ops_complete_biofill, sh, NULL); |
1366 | async_trigger_callback(&submit); | |
91c00924 DW |
1367 | } |
1368 | ||
4e7d2c0a | 1369 | static void mark_target_uptodate(struct stripe_head *sh, int target) |
91c00924 | 1370 | { |
4e7d2c0a | 1371 | struct r5dev *tgt; |
91c00924 | 1372 | |
4e7d2c0a DW |
1373 | if (target < 0) |
1374 | return; | |
91c00924 | 1375 | |
4e7d2c0a | 1376 | tgt = &sh->dev[target]; |
91c00924 DW |
1377 | set_bit(R5_UPTODATE, &tgt->flags); |
1378 | BUG_ON(!test_bit(R5_Wantcompute, &tgt->flags)); | |
1379 | clear_bit(R5_Wantcompute, &tgt->flags); | |
4e7d2c0a DW |
1380 | } |
1381 | ||
ac6b53b6 | 1382 | static void ops_complete_compute(void *stripe_head_ref) |
91c00924 DW |
1383 | { |
1384 | struct stripe_head *sh = stripe_head_ref; | |
91c00924 | 1385 | |
e46b272b | 1386 | pr_debug("%s: stripe %llu\n", __func__, |
91c00924 DW |
1387 | (unsigned long long)sh->sector); |
1388 | ||
ac6b53b6 | 1389 | /* mark the computed target(s) as uptodate */ |
4e7d2c0a | 1390 | mark_target_uptodate(sh, sh->ops.target); |
ac6b53b6 | 1391 | mark_target_uptodate(sh, sh->ops.target2); |
4e7d2c0a | 1392 | |
ecc65c9b DW |
1393 | clear_bit(STRIPE_COMPUTE_RUN, &sh->state); |
1394 | if (sh->check_state == check_state_compute_run) | |
1395 | sh->check_state = check_state_compute_result; | |
91c00924 | 1396 | set_bit(STRIPE_HANDLE, &sh->state); |
6d036f7d | 1397 | raid5_release_stripe(sh); |
91c00924 DW |
1398 | } |
1399 | ||
d6f38f31 DW |
1400 | /* return a pointer to the address conversion region of the scribble buffer */ |
1401 | static addr_conv_t *to_addr_conv(struct stripe_head *sh, | |
46d5b785 | 1402 | struct raid5_percpu *percpu, int i) |
d6f38f31 | 1403 | { |
46d5b785 | 1404 | void *addr; |
1405 | ||
1406 | addr = flex_array_get(percpu->scribble, i); | |
1407 | return addr + sizeof(struct page *) * (sh->disks + 2); | |
1408 | } | |
1409 | ||
1410 | /* return a pointer to the address conversion region of the scribble buffer */ | |
1411 | static struct page **to_addr_page(struct raid5_percpu *percpu, int i) | |
1412 | { | |
1413 | void *addr; | |
1414 | ||
1415 | addr = flex_array_get(percpu->scribble, i); | |
1416 | return addr; | |
d6f38f31 DW |
1417 | } |
1418 | ||
1419 | static struct dma_async_tx_descriptor * | |
1420 | ops_run_compute5(struct stripe_head *sh, struct raid5_percpu *percpu) | |
91c00924 | 1421 | { |
91c00924 | 1422 | int disks = sh->disks; |
46d5b785 | 1423 | struct page **xor_srcs = to_addr_page(percpu, 0); |
91c00924 DW |
1424 | int target = sh->ops.target; |
1425 | struct r5dev *tgt = &sh->dev[target]; | |
1426 | struct page *xor_dest = tgt->page; | |
1427 | int count = 0; | |
1428 | struct dma_async_tx_descriptor *tx; | |
a08abd8c | 1429 | struct async_submit_ctl submit; |
91c00924 DW |
1430 | int i; |
1431 | ||
59fc630b | 1432 | BUG_ON(sh->batch_head); |
1433 | ||
91c00924 | 1434 | pr_debug("%s: stripe %llu block: %d\n", |
e46b272b | 1435 | __func__, (unsigned long long)sh->sector, target); |
91c00924 DW |
1436 | BUG_ON(!test_bit(R5_Wantcompute, &tgt->flags)); |
1437 | ||
1438 | for (i = disks; i--; ) | |
1439 | if (i != target) | |
1440 | xor_srcs[count++] = sh->dev[i].page; | |
1441 | ||
1442 | atomic_inc(&sh->count); | |
1443 | ||
0403e382 | 1444 | init_async_submit(&submit, ASYNC_TX_FENCE|ASYNC_TX_XOR_ZERO_DST, NULL, |
46d5b785 | 1445 | ops_complete_compute, sh, to_addr_conv(sh, percpu, 0)); |
91c00924 | 1446 | if (unlikely(count == 1)) |
a08abd8c | 1447 | tx = async_memcpy(xor_dest, xor_srcs[0], 0, 0, STRIPE_SIZE, &submit); |
91c00924 | 1448 | else |
a08abd8c | 1449 | tx = async_xor(xor_dest, xor_srcs, 0, count, STRIPE_SIZE, &submit); |
91c00924 | 1450 | |
91c00924 DW |
1451 | return tx; |
1452 | } | |
1453 | ||
ac6b53b6 DW |
1454 | /* set_syndrome_sources - populate source buffers for gen_syndrome |
1455 | * @srcs - (struct page *) array of size sh->disks | |
1456 | * @sh - stripe_head to parse | |
1457 | * | |
1458 | * Populates srcs in proper layout order for the stripe and returns the | |
1459 | * 'count' of sources to be used in a call to async_gen_syndrome. The P | |
1460 | * destination buffer is recorded in srcs[count] and the Q destination | |
1461 | * is recorded in srcs[count+1]]. | |
1462 | */ | |
584acdd4 MS |
1463 | static int set_syndrome_sources(struct page **srcs, |
1464 | struct stripe_head *sh, | |
1465 | int srctype) | |
ac6b53b6 DW |
1466 | { |
1467 | int disks = sh->disks; | |
1468 | int syndrome_disks = sh->ddf_layout ? disks : (disks - 2); | |
1469 | int d0_idx = raid6_d0(sh); | |
1470 | int count; | |
1471 | int i; | |
1472 | ||
1473 | for (i = 0; i < disks; i++) | |
5dd33c9a | 1474 | srcs[i] = NULL; |
ac6b53b6 DW |
1475 | |
1476 | count = 0; | |
1477 | i = d0_idx; | |
1478 | do { | |
1479 | int slot = raid6_idx_to_slot(i, sh, &count, syndrome_disks); | |
584acdd4 | 1480 | struct r5dev *dev = &sh->dev[i]; |
ac6b53b6 | 1481 | |
584acdd4 MS |
1482 | if (i == sh->qd_idx || i == sh->pd_idx || |
1483 | (srctype == SYNDROME_SRC_ALL) || | |
1484 | (srctype == SYNDROME_SRC_WANT_DRAIN && | |
1e6d690b SL |
1485 | (test_bit(R5_Wantdrain, &dev->flags) || |
1486 | test_bit(R5_InJournal, &dev->flags))) || | |
584acdd4 | 1487 | (srctype == SYNDROME_SRC_WRITTEN && |
0977762f SL |
1488 | (dev->written || |
1489 | test_bit(R5_InJournal, &dev->flags)))) { | |
1e6d690b SL |
1490 | if (test_bit(R5_InJournal, &dev->flags)) |
1491 | srcs[slot] = sh->dev[i].orig_page; | |
1492 | else | |
1493 | srcs[slot] = sh->dev[i].page; | |
1494 | } | |
ac6b53b6 DW |
1495 | i = raid6_next_disk(i, disks); |
1496 | } while (i != d0_idx); | |
ac6b53b6 | 1497 | |
e4424fee | 1498 | return syndrome_disks; |
ac6b53b6 DW |
1499 | } |
1500 | ||
1501 | static struct dma_async_tx_descriptor * | |
1502 | ops_run_compute6_1(struct stripe_head *sh, struct raid5_percpu *percpu) | |
1503 | { | |
1504 | int disks = sh->disks; | |
46d5b785 | 1505 | struct page **blocks = to_addr_page(percpu, 0); |
ac6b53b6 DW |
1506 | int target; |
1507 | int qd_idx = sh->qd_idx; | |
1508 | struct dma_async_tx_descriptor *tx; | |
1509 | struct async_submit_ctl submit; | |
1510 | struct r5dev *tgt; | |
1511 | struct page *dest; | |
1512 | int i; | |
1513 | int count; | |
1514 | ||
59fc630b | 1515 | BUG_ON(sh->batch_head); |
ac6b53b6 DW |
1516 | if (sh->ops.target < 0) |
1517 | target = sh->ops.target2; | |
1518 | else if (sh->ops.target2 < 0) | |
1519 | target = sh->ops.target; | |
91c00924 | 1520 | else |
ac6b53b6 DW |
1521 | /* we should only have one valid target */ |
1522 | BUG(); | |
1523 | BUG_ON(target < 0); | |
1524 | pr_debug("%s: stripe %llu block: %d\n", | |
1525 | __func__, (unsigned long long)sh->sector, target); | |
1526 | ||
1527 | tgt = &sh->dev[target]; | |
1528 | BUG_ON(!test_bit(R5_Wantcompute, &tgt->flags)); | |
1529 | dest = tgt->page; | |
1530 | ||
1531 | atomic_inc(&sh->count); | |
1532 | ||
1533 | if (target == qd_idx) { | |
584acdd4 | 1534 | count = set_syndrome_sources(blocks, sh, SYNDROME_SRC_ALL); |
ac6b53b6 DW |
1535 | blocks[count] = NULL; /* regenerating p is not necessary */ |
1536 | BUG_ON(blocks[count+1] != dest); /* q should already be set */ | |
0403e382 DW |
1537 | init_async_submit(&submit, ASYNC_TX_FENCE, NULL, |
1538 | ops_complete_compute, sh, | |
46d5b785 | 1539 | to_addr_conv(sh, percpu, 0)); |
ac6b53b6 DW |
1540 | tx = async_gen_syndrome(blocks, 0, count+2, STRIPE_SIZE, &submit); |
1541 | } else { | |
1542 | /* Compute any data- or p-drive using XOR */ | |
1543 | count = 0; | |
1544 | for (i = disks; i-- ; ) { | |
1545 | if (i == target || i == qd_idx) | |
1546 | continue; | |
1547 | blocks[count++] = sh->dev[i].page; | |
1548 | } | |
1549 | ||
0403e382 DW |
1550 | init_async_submit(&submit, ASYNC_TX_FENCE|ASYNC_TX_XOR_ZERO_DST, |
1551 | NULL, ops_complete_compute, sh, | |
46d5b785 | 1552 | to_addr_conv(sh, percpu, 0)); |
ac6b53b6 DW |
1553 | tx = async_xor(dest, blocks, 0, count, STRIPE_SIZE, &submit); |
1554 | } | |
91c00924 | 1555 | |
91c00924 DW |
1556 | return tx; |
1557 | } | |
1558 | ||
ac6b53b6 DW |
1559 | static struct dma_async_tx_descriptor * |
1560 | ops_run_compute6_2(struct stripe_head *sh, struct raid5_percpu *percpu) | |
1561 | { | |
1562 | int i, count, disks = sh->disks; | |
1563 | int syndrome_disks = sh->ddf_layout ? disks : disks-2; | |
1564 | int d0_idx = raid6_d0(sh); | |
1565 | int faila = -1, failb = -1; | |
1566 | int target = sh->ops.target; | |
1567 | int target2 = sh->ops.target2; | |
1568 | struct r5dev *tgt = &sh->dev[target]; | |
1569 | struct r5dev *tgt2 = &sh->dev[target2]; | |
1570 | struct dma_async_tx_descriptor *tx; | |
46d5b785 | 1571 | struct page **blocks = to_addr_page(percpu, 0); |
ac6b53b6 DW |
1572 | struct async_submit_ctl submit; |
1573 | ||
59fc630b | 1574 | BUG_ON(sh->batch_head); |
ac6b53b6 DW |
1575 | pr_debug("%s: stripe %llu block1: %d block2: %d\n", |
1576 | __func__, (unsigned long long)sh->sector, target, target2); | |
1577 | BUG_ON(target < 0 || target2 < 0); | |
1578 | BUG_ON(!test_bit(R5_Wantcompute, &tgt->flags)); | |
1579 | BUG_ON(!test_bit(R5_Wantcompute, &tgt2->flags)); | |
1580 | ||
6c910a78 | 1581 | /* we need to open-code set_syndrome_sources to handle the |
ac6b53b6 DW |
1582 | * slot number conversion for 'faila' and 'failb' |
1583 | */ | |
1584 | for (i = 0; i < disks ; i++) | |
5dd33c9a | 1585 | blocks[i] = NULL; |
ac6b53b6 DW |
1586 | count = 0; |
1587 | i = d0_idx; | |
1588 | do { | |
1589 | int slot = raid6_idx_to_slot(i, sh, &count, syndrome_disks); | |
1590 | ||
1591 | blocks[slot] = sh->dev[i].page; | |
1592 | ||
1593 | if (i == target) | |
1594 | faila = slot; | |
1595 | if (i == target2) | |
1596 | failb = slot; | |
1597 | i = raid6_next_disk(i, disks); | |
1598 | } while (i != d0_idx); | |
ac6b53b6 DW |
1599 | |
1600 | BUG_ON(faila == failb); | |
1601 | if (failb < faila) | |
1602 | swap(faila, failb); | |
1603 | pr_debug("%s: stripe: %llu faila: %d failb: %d\n", | |
1604 | __func__, (unsigned long long)sh->sector, faila, failb); | |
1605 | ||
1606 | atomic_inc(&sh->count); | |
1607 | ||
1608 | if (failb == syndrome_disks+1) { | |
1609 | /* Q disk is one of the missing disks */ | |
1610 | if (faila == syndrome_disks) { | |
1611 | /* Missing P+Q, just recompute */ | |
0403e382 DW |
1612 | init_async_submit(&submit, ASYNC_TX_FENCE, NULL, |
1613 | ops_complete_compute, sh, | |
46d5b785 | 1614 | to_addr_conv(sh, percpu, 0)); |
e4424fee | 1615 | return async_gen_syndrome(blocks, 0, syndrome_disks+2, |
ac6b53b6 DW |
1616 | STRIPE_SIZE, &submit); |
1617 | } else { | |
1618 | struct page *dest; | |
1619 | int data_target; | |
1620 | int qd_idx = sh->qd_idx; | |
1621 | ||
1622 | /* Missing D+Q: recompute D from P, then recompute Q */ | |
1623 | if (target == qd_idx) | |
1624 | data_target = target2; | |
1625 | else | |
1626 | data_target = target; | |
1627 | ||
1628 | count = 0; | |
1629 | for (i = disks; i-- ; ) { | |
1630 | if (i == data_target || i == qd_idx) | |
1631 | continue; | |
1632 | blocks[count++] = sh->dev[i].page; | |
1633 | } | |
1634 | dest = sh->dev[data_target].page; | |
0403e382 DW |
1635 | init_async_submit(&submit, |
1636 | ASYNC_TX_FENCE|ASYNC_TX_XOR_ZERO_DST, | |
1637 | NULL, NULL, NULL, | |
46d5b785 | 1638 | to_addr_conv(sh, percpu, 0)); |
ac6b53b6 DW |
1639 | tx = async_xor(dest, blocks, 0, count, STRIPE_SIZE, |
1640 | &submit); | |
1641 | ||
584acdd4 | 1642 | count = set_syndrome_sources(blocks, sh, SYNDROME_SRC_ALL); |
0403e382 DW |
1643 | init_async_submit(&submit, ASYNC_TX_FENCE, tx, |
1644 | ops_complete_compute, sh, | |
46d5b785 | 1645 | to_addr_conv(sh, percpu, 0)); |
ac6b53b6 DW |
1646 | return async_gen_syndrome(blocks, 0, count+2, |
1647 | STRIPE_SIZE, &submit); | |
1648 | } | |
ac6b53b6 | 1649 | } else { |
6c910a78 DW |
1650 | init_async_submit(&submit, ASYNC_TX_FENCE, NULL, |
1651 | ops_complete_compute, sh, | |
46d5b785 | 1652 | to_addr_conv(sh, percpu, 0)); |
6c910a78 DW |
1653 | if (failb == syndrome_disks) { |
1654 | /* We're missing D+P. */ | |
1655 | return async_raid6_datap_recov(syndrome_disks+2, | |
1656 | STRIPE_SIZE, faila, | |
1657 | blocks, &submit); | |
1658 | } else { | |
1659 | /* We're missing D+D. */ | |
1660 | return async_raid6_2data_recov(syndrome_disks+2, | |
1661 | STRIPE_SIZE, faila, failb, | |
1662 | blocks, &submit); | |
1663 | } | |
ac6b53b6 DW |
1664 | } |
1665 | } | |
1666 | ||
91c00924 DW |
1667 | static void ops_complete_prexor(void *stripe_head_ref) |
1668 | { | |
1669 | struct stripe_head *sh = stripe_head_ref; | |
1670 | ||
e46b272b | 1671 | pr_debug("%s: stripe %llu\n", __func__, |
91c00924 | 1672 | (unsigned long long)sh->sector); |
1e6d690b SL |
1673 | |
1674 | if (r5c_is_writeback(sh->raid_conf->log)) | |
1675 | /* | |
1676 | * raid5-cache write back uses orig_page during prexor. | |
1677 | * After prexor, it is time to free orig_page | |
1678 | */ | |
1679 | r5c_release_extra_page(sh); | |
91c00924 DW |
1680 | } |
1681 | ||
1682 | static struct dma_async_tx_descriptor * | |
584acdd4 MS |
1683 | ops_run_prexor5(struct stripe_head *sh, struct raid5_percpu *percpu, |
1684 | struct dma_async_tx_descriptor *tx) | |
91c00924 | 1685 | { |
91c00924 | 1686 | int disks = sh->disks; |
46d5b785 | 1687 | struct page **xor_srcs = to_addr_page(percpu, 0); |
91c00924 | 1688 | int count = 0, pd_idx = sh->pd_idx, i; |
a08abd8c | 1689 | struct async_submit_ctl submit; |
91c00924 DW |
1690 | |
1691 | /* existing parity data subtracted */ | |
1692 | struct page *xor_dest = xor_srcs[count++] = sh->dev[pd_idx].page; | |
1693 | ||
59fc630b | 1694 | BUG_ON(sh->batch_head); |
e46b272b | 1695 | pr_debug("%s: stripe %llu\n", __func__, |
91c00924 DW |
1696 | (unsigned long long)sh->sector); |
1697 | ||
1698 | for (i = disks; i--; ) { | |
1699 | struct r5dev *dev = &sh->dev[i]; | |
1700 | /* Only process blocks that are known to be uptodate */ | |
1e6d690b SL |
1701 | if (test_bit(R5_InJournal, &dev->flags)) |
1702 | xor_srcs[count++] = dev->orig_page; | |
1703 | else if (test_bit(R5_Wantdrain, &dev->flags)) | |
91c00924 DW |
1704 | xor_srcs[count++] = dev->page; |
1705 | } | |
1706 | ||
0403e382 | 1707 | init_async_submit(&submit, ASYNC_TX_FENCE|ASYNC_TX_XOR_DROP_DST, tx, |
46d5b785 | 1708 | ops_complete_prexor, sh, to_addr_conv(sh, percpu, 0)); |
a08abd8c | 1709 | tx = async_xor(xor_dest, xor_srcs, 0, count, STRIPE_SIZE, &submit); |
91c00924 DW |
1710 | |
1711 | return tx; | |
1712 | } | |
1713 | ||
584acdd4 MS |
1714 | static struct dma_async_tx_descriptor * |
1715 | ops_run_prexor6(struct stripe_head *sh, struct raid5_percpu *percpu, | |
1716 | struct dma_async_tx_descriptor *tx) | |
1717 | { | |
1718 | struct page **blocks = to_addr_page(percpu, 0); | |
1719 | int count; | |
1720 | struct async_submit_ctl submit; | |
1721 | ||
1722 | pr_debug("%s: stripe %llu\n", __func__, | |
1723 | (unsigned long long)sh->sector); | |
1724 | ||
1725 | count = set_syndrome_sources(blocks, sh, SYNDROME_SRC_WANT_DRAIN); | |
1726 | ||
1727 | init_async_submit(&submit, ASYNC_TX_FENCE|ASYNC_TX_PQ_XOR_DST, tx, | |
1728 | ops_complete_prexor, sh, to_addr_conv(sh, percpu, 0)); | |
1729 | tx = async_gen_syndrome(blocks, 0, count+2, STRIPE_SIZE, &submit); | |
1730 | ||
1731 | return tx; | |
1732 | } | |
1733 | ||
91c00924 | 1734 | static struct dma_async_tx_descriptor * |
d8ee0728 | 1735 | ops_run_biodrain(struct stripe_head *sh, struct dma_async_tx_descriptor *tx) |
91c00924 | 1736 | { |
1e6d690b | 1737 | struct r5conf *conf = sh->raid_conf; |
91c00924 | 1738 | int disks = sh->disks; |
d8ee0728 | 1739 | int i; |
59fc630b | 1740 | struct stripe_head *head_sh = sh; |
91c00924 | 1741 | |
e46b272b | 1742 | pr_debug("%s: stripe %llu\n", __func__, |
91c00924 DW |
1743 | (unsigned long long)sh->sector); |
1744 | ||
1745 | for (i = disks; i--; ) { | |
59fc630b | 1746 | struct r5dev *dev; |
91c00924 | 1747 | struct bio *chosen; |
91c00924 | 1748 | |
59fc630b | 1749 | sh = head_sh; |
1750 | if (test_and_clear_bit(R5_Wantdrain, &head_sh->dev[i].flags)) { | |
91c00924 DW |
1751 | struct bio *wbi; |
1752 | ||
59fc630b | 1753 | again: |
1754 | dev = &sh->dev[i]; | |
1e6d690b SL |
1755 | /* |
1756 | * clear R5_InJournal, so when rewriting a page in | |
1757 | * journal, it is not skipped by r5l_log_stripe() | |
1758 | */ | |
1759 | clear_bit(R5_InJournal, &dev->flags); | |
b17459c0 | 1760 | spin_lock_irq(&sh->stripe_lock); |
91c00924 DW |
1761 | chosen = dev->towrite; |
1762 | dev->towrite = NULL; | |
7a87f434 | 1763 | sh->overwrite_disks = 0; |
91c00924 DW |
1764 | BUG_ON(dev->written); |
1765 | wbi = dev->written = chosen; | |
b17459c0 | 1766 | spin_unlock_irq(&sh->stripe_lock); |
d592a996 | 1767 | WARN_ON(dev->page != dev->orig_page); |
91c00924 | 1768 | |
4f024f37 | 1769 | while (wbi && wbi->bi_iter.bi_sector < |
91c00924 | 1770 | dev->sector + STRIPE_SECTORS) { |
1eff9d32 | 1771 | if (wbi->bi_opf & REQ_FUA) |
e9c7469b | 1772 | set_bit(R5_WantFUA, &dev->flags); |
1eff9d32 | 1773 | if (wbi->bi_opf & REQ_SYNC) |
bc0934f0 | 1774 | set_bit(R5_SyncIO, &dev->flags); |
796a5cf0 | 1775 | if (bio_op(wbi) == REQ_OP_DISCARD) |
620125f2 | 1776 | set_bit(R5_Discard, &dev->flags); |
d592a996 SL |
1777 | else { |
1778 | tx = async_copy_data(1, wbi, &dev->page, | |
1e6d690b SL |
1779 | dev->sector, tx, sh, |
1780 | r5c_is_writeback(conf->log)); | |
1781 | if (dev->page != dev->orig_page && | |
1782 | !r5c_is_writeback(conf->log)) { | |
d592a996 SL |
1783 | set_bit(R5_SkipCopy, &dev->flags); |
1784 | clear_bit(R5_UPTODATE, &dev->flags); | |
1785 | clear_bit(R5_OVERWRITE, &dev->flags); | |
1786 | } | |
1787 | } | |
91c00924 DW |
1788 | wbi = r5_next_bio(wbi, dev->sector); |
1789 | } | |
59fc630b | 1790 | |
1791 | if (head_sh->batch_head) { | |
1792 | sh = list_first_entry(&sh->batch_list, | |
1793 | struct stripe_head, | |
1794 | batch_list); | |
1795 | if (sh == head_sh) | |
1796 | continue; | |
1797 | goto again; | |
1798 | } | |
91c00924 DW |
1799 | } |
1800 | } | |
1801 | ||
1802 | return tx; | |
1803 | } | |
1804 | ||
ac6b53b6 | 1805 | static void ops_complete_reconstruct(void *stripe_head_ref) |
91c00924 DW |
1806 | { |
1807 | struct stripe_head *sh = stripe_head_ref; | |
ac6b53b6 DW |
1808 | int disks = sh->disks; |
1809 | int pd_idx = sh->pd_idx; | |
1810 | int qd_idx = sh->qd_idx; | |
1811 | int i; | |
9e444768 | 1812 | bool fua = false, sync = false, discard = false; |
91c00924 | 1813 | |
e46b272b | 1814 | pr_debug("%s: stripe %llu\n", __func__, |
91c00924 DW |
1815 | (unsigned long long)sh->sector); |
1816 | ||
bc0934f0 | 1817 | for (i = disks; i--; ) { |
e9c7469b | 1818 | fua |= test_bit(R5_WantFUA, &sh->dev[i].flags); |
bc0934f0 | 1819 | sync |= test_bit(R5_SyncIO, &sh->dev[i].flags); |
9e444768 | 1820 | discard |= test_bit(R5_Discard, &sh->dev[i].flags); |
bc0934f0 | 1821 | } |
e9c7469b | 1822 | |
91c00924 DW |
1823 | for (i = disks; i--; ) { |
1824 | struct r5dev *dev = &sh->dev[i]; | |
ac6b53b6 | 1825 | |
e9c7469b | 1826 | if (dev->written || i == pd_idx || i == qd_idx) { |
d592a996 | 1827 | if (!discard && !test_bit(R5_SkipCopy, &dev->flags)) |
9e444768 | 1828 | set_bit(R5_UPTODATE, &dev->flags); |
e9c7469b TH |
1829 | if (fua) |
1830 | set_bit(R5_WantFUA, &dev->flags); | |
bc0934f0 SL |
1831 | if (sync) |
1832 | set_bit(R5_SyncIO, &dev->flags); | |
e9c7469b | 1833 | } |
91c00924 DW |
1834 | } |
1835 | ||
d8ee0728 DW |
1836 | if (sh->reconstruct_state == reconstruct_state_drain_run) |
1837 | sh->reconstruct_state = reconstruct_state_drain_result; | |
1838 | else if (sh->reconstruct_state == reconstruct_state_prexor_drain_run) | |
1839 | sh->reconstruct_state = reconstruct_state_prexor_drain_result; | |
1840 | else { | |
1841 | BUG_ON(sh->reconstruct_state != reconstruct_state_run); | |
1842 | sh->reconstruct_state = reconstruct_state_result; | |
1843 | } | |
91c00924 DW |
1844 | |
1845 | set_bit(STRIPE_HANDLE, &sh->state); | |
6d036f7d | 1846 | raid5_release_stripe(sh); |
91c00924 DW |
1847 | } |
1848 | ||
1849 | static void | |
ac6b53b6 DW |
1850 | ops_run_reconstruct5(struct stripe_head *sh, struct raid5_percpu *percpu, |
1851 | struct dma_async_tx_descriptor *tx) | |
91c00924 | 1852 | { |
91c00924 | 1853 | int disks = sh->disks; |
59fc630b | 1854 | struct page **xor_srcs; |
a08abd8c | 1855 | struct async_submit_ctl submit; |
59fc630b | 1856 | int count, pd_idx = sh->pd_idx, i; |
91c00924 | 1857 | struct page *xor_dest; |
d8ee0728 | 1858 | int prexor = 0; |
91c00924 | 1859 | unsigned long flags; |
59fc630b | 1860 | int j = 0; |
1861 | struct stripe_head *head_sh = sh; | |
1862 | int last_stripe; | |
91c00924 | 1863 | |
e46b272b | 1864 | pr_debug("%s: stripe %llu\n", __func__, |
91c00924 DW |
1865 | (unsigned long long)sh->sector); |
1866 | ||
620125f2 SL |
1867 | for (i = 0; i < sh->disks; i++) { |
1868 | if (pd_idx == i) | |
1869 | continue; | |
1870 | if (!test_bit(R5_Discard, &sh->dev[i].flags)) | |
1871 | break; | |
1872 | } | |
1873 | if (i >= sh->disks) { | |
1874 | atomic_inc(&sh->count); | |
620125f2 SL |
1875 | set_bit(R5_Discard, &sh->dev[pd_idx].flags); |
1876 | ops_complete_reconstruct(sh); | |
1877 | return; | |
1878 | } | |
59fc630b | 1879 | again: |
1880 | count = 0; | |
1881 | xor_srcs = to_addr_page(percpu, j); | |
91c00924 DW |
1882 | /* check if prexor is active which means only process blocks |
1883 | * that are part of a read-modify-write (written) | |
1884 | */ | |
59fc630b | 1885 | if (head_sh->reconstruct_state == reconstruct_state_prexor_drain_run) { |
d8ee0728 | 1886 | prexor = 1; |
91c00924 DW |
1887 | xor_dest = xor_srcs[count++] = sh->dev[pd_idx].page; |
1888 | for (i = disks; i--; ) { | |
1889 | struct r5dev *dev = &sh->dev[i]; | |
1e6d690b SL |
1890 | if (head_sh->dev[i].written || |
1891 | test_bit(R5_InJournal, &head_sh->dev[i].flags)) | |
91c00924 DW |
1892 | xor_srcs[count++] = dev->page; |
1893 | } | |
1894 | } else { | |
1895 | xor_dest = sh->dev[pd_idx].page; | |
1896 | for (i = disks; i--; ) { | |
1897 | struct r5dev *dev = &sh->dev[i]; | |
1898 | if (i != pd_idx) | |
1899 | xor_srcs[count++] = dev->page; | |
1900 | } | |
1901 | } | |
1902 | ||
91c00924 DW |
1903 | /* 1/ if we prexor'd then the dest is reused as a source |
1904 | * 2/ if we did not prexor then we are redoing the parity | |
1905 | * set ASYNC_TX_XOR_DROP_DST and ASYNC_TX_XOR_ZERO_DST | |
1906 | * for the synchronous xor case | |
1907 | */ | |
59fc630b | 1908 | last_stripe = !head_sh->batch_head || |
1909 | list_first_entry(&sh->batch_list, | |
1910 | struct stripe_head, batch_list) == head_sh; | |
1911 | if (last_stripe) { | |
1912 | flags = ASYNC_TX_ACK | | |
1913 | (prexor ? ASYNC_TX_XOR_DROP_DST : ASYNC_TX_XOR_ZERO_DST); | |
1914 | ||
1915 | atomic_inc(&head_sh->count); | |
1916 | init_async_submit(&submit, flags, tx, ops_complete_reconstruct, head_sh, | |
1917 | to_addr_conv(sh, percpu, j)); | |
1918 | } else { | |
1919 | flags = prexor ? ASYNC_TX_XOR_DROP_DST : ASYNC_TX_XOR_ZERO_DST; | |
1920 | init_async_submit(&submit, flags, tx, NULL, NULL, | |
1921 | to_addr_conv(sh, percpu, j)); | |
1922 | } | |
91c00924 | 1923 | |
a08abd8c DW |
1924 | if (unlikely(count == 1)) |
1925 | tx = async_memcpy(xor_dest, xor_srcs[0], 0, 0, STRIPE_SIZE, &submit); | |
1926 | else | |
1927 | tx = async_xor(xor_dest, xor_srcs, 0, count, STRIPE_SIZE, &submit); | |
59fc630b | 1928 | if (!last_stripe) { |
1929 | j++; | |
1930 | sh = list_first_entry(&sh->batch_list, struct stripe_head, | |
1931 | batch_list); | |
1932 | goto again; | |
1933 | } | |
91c00924 DW |
1934 | } |
1935 | ||
ac6b53b6 DW |
1936 | static void |
1937 | ops_run_reconstruct6(struct stripe_head *sh, struct raid5_percpu *percpu, | |
1938 | struct dma_async_tx_descriptor *tx) | |
1939 | { | |
1940 | struct async_submit_ctl submit; | |
59fc630b | 1941 | struct page **blocks; |
1942 | int count, i, j = 0; | |
1943 | struct stripe_head *head_sh = sh; | |
1944 | int last_stripe; | |
584acdd4 MS |
1945 | int synflags; |
1946 | unsigned long txflags; | |
ac6b53b6 DW |
1947 | |
1948 | pr_debug("%s: stripe %llu\n", __func__, (unsigned long long)sh->sector); | |
1949 | ||
620125f2 SL |
1950 | for (i = 0; i < sh->disks; i++) { |
1951 | if (sh->pd_idx == i || sh->qd_idx == i) | |
1952 | continue; | |
1953 | if (!test_bit(R5_Discard, &sh->dev[i].flags)) | |
1954 | break; | |
1955 | } | |
1956 | if (i >= sh->disks) { | |
1957 | atomic_inc(&sh->count); | |
620125f2 SL |
1958 | set_bit(R5_Discard, &sh->dev[sh->pd_idx].flags); |
1959 | set_bit(R5_Discard, &sh->dev[sh->qd_idx].flags); | |
1960 | ops_complete_reconstruct(sh); | |
1961 | return; | |
1962 | } | |
1963 | ||
59fc630b | 1964 | again: |
1965 | blocks = to_addr_page(percpu, j); | |
584acdd4 MS |
1966 | |
1967 | if (sh->reconstruct_state == reconstruct_state_prexor_drain_run) { | |
1968 | synflags = SYNDROME_SRC_WRITTEN; | |
1969 | txflags = ASYNC_TX_ACK | ASYNC_TX_PQ_XOR_DST; | |
1970 | } else { | |
1971 | synflags = SYNDROME_SRC_ALL; | |
1972 | txflags = ASYNC_TX_ACK; | |
1973 | } | |
1974 | ||
1975 | count = set_syndrome_sources(blocks, sh, synflags); | |
59fc630b | 1976 | last_stripe = !head_sh->batch_head || |
1977 | list_first_entry(&sh->batch_list, | |
1978 | struct stripe_head, batch_list) == head_sh; | |
1979 | ||
1980 | if (last_stripe) { | |
1981 | atomic_inc(&head_sh->count); | |
584acdd4 | 1982 | init_async_submit(&submit, txflags, tx, ops_complete_reconstruct, |
59fc630b | 1983 | head_sh, to_addr_conv(sh, percpu, j)); |
1984 | } else | |
1985 | init_async_submit(&submit, 0, tx, NULL, NULL, | |
1986 | to_addr_conv(sh, percpu, j)); | |
48769695 | 1987 | tx = async_gen_syndrome(blocks, 0, count+2, STRIPE_SIZE, &submit); |
59fc630b | 1988 | if (!last_stripe) { |
1989 | j++; | |
1990 | sh = list_first_entry(&sh->batch_list, struct stripe_head, | |
1991 | batch_list); | |
1992 | goto again; | |
1993 | } | |
91c00924 DW |
1994 | } |
1995 | ||
1996 | static void ops_complete_check(void *stripe_head_ref) | |
1997 | { | |
1998 | struct stripe_head *sh = stripe_head_ref; | |
91c00924 | 1999 | |
e46b272b | 2000 | pr_debug("%s: stripe %llu\n", __func__, |
91c00924 DW |
2001 | (unsigned long long)sh->sector); |
2002 | ||
ecc65c9b | 2003 | sh->check_state = check_state_check_result; |
91c00924 | 2004 | set_bit(STRIPE_HANDLE, &sh->state); |
6d036f7d | 2005 | raid5_release_stripe(sh); |
91c00924 DW |
2006 | } |
2007 | ||
ac6b53b6 | 2008 | static void ops_run_check_p(struct stripe_head *sh, struct raid5_percpu *percpu) |
91c00924 | 2009 | { |
91c00924 | 2010 | int disks = sh->disks; |
ac6b53b6 DW |
2011 | int pd_idx = sh->pd_idx; |
2012 | int qd_idx = sh->qd_idx; | |
2013 | struct page *xor_dest; | |
46d5b785 | 2014 | struct page **xor_srcs = to_addr_page(percpu, 0); |
91c00924 | 2015 | struct dma_async_tx_descriptor *tx; |
a08abd8c | 2016 | struct async_submit_ctl submit; |
ac6b53b6 DW |
2017 | int count; |
2018 | int i; | |
91c00924 | 2019 | |
e46b272b | 2020 | pr_debug("%s: stripe %llu\n", __func__, |
91c00924 DW |
2021 | (unsigned long long)sh->sector); |
2022 | ||
59fc630b | 2023 | BUG_ON(sh->batch_head); |
ac6b53b6 DW |
2024 | count = 0; |
2025 | xor_dest = sh->dev[pd_idx].page; | |
2026 | xor_srcs[count++] = xor_dest; | |
91c00924 | 2027 | for (i = disks; i--; ) { |
ac6b53b6 DW |
2028 | if (i == pd_idx || i == qd_idx) |
2029 | continue; | |
2030 | xor_srcs[count++] = sh->dev[i].page; | |
91c00924 DW |
2031 | } |
2032 | ||
d6f38f31 | 2033 | init_async_submit(&submit, 0, NULL, NULL, NULL, |
46d5b785 | 2034 | to_addr_conv(sh, percpu, 0)); |
099f53cb | 2035 | tx = async_xor_val(xor_dest, xor_srcs, 0, count, STRIPE_SIZE, |
a08abd8c | 2036 | &sh->ops.zero_sum_result, &submit); |
91c00924 | 2037 | |
91c00924 | 2038 | atomic_inc(&sh->count); |
a08abd8c DW |
2039 | init_async_submit(&submit, ASYNC_TX_ACK, tx, ops_complete_check, sh, NULL); |
2040 | tx = async_trigger_callback(&submit); | |
91c00924 DW |
2041 | } |
2042 | ||
ac6b53b6 DW |
2043 | static void ops_run_check_pq(struct stripe_head *sh, struct raid5_percpu *percpu, int checkp) |
2044 | { | |
46d5b785 | 2045 | struct page **srcs = to_addr_page(percpu, 0); |
ac6b53b6 DW |
2046 | struct async_submit_ctl submit; |
2047 | int count; | |
2048 | ||
2049 | pr_debug("%s: stripe %llu checkp: %d\n", __func__, | |
2050 | (unsigned long long)sh->sector, checkp); | |
2051 | ||
59fc630b | 2052 | BUG_ON(sh->batch_head); |
584acdd4 | 2053 | count = set_syndrome_sources(srcs, sh, SYNDROME_SRC_ALL); |
ac6b53b6 DW |
2054 | if (!checkp) |
2055 | srcs[count] = NULL; | |
91c00924 | 2056 | |
91c00924 | 2057 | atomic_inc(&sh->count); |
ac6b53b6 | 2058 | init_async_submit(&submit, ASYNC_TX_ACK, NULL, ops_complete_check, |
46d5b785 | 2059 | sh, to_addr_conv(sh, percpu, 0)); |
ac6b53b6 DW |
2060 | async_syndrome_val(srcs, 0, count+2, STRIPE_SIZE, |
2061 | &sh->ops.zero_sum_result, percpu->spare_page, &submit); | |
91c00924 DW |
2062 | } |
2063 | ||
51acbcec | 2064 | static void raid_run_ops(struct stripe_head *sh, unsigned long ops_request) |
91c00924 DW |
2065 | { |
2066 | int overlap_clear = 0, i, disks = sh->disks; | |
2067 | struct dma_async_tx_descriptor *tx = NULL; | |
d1688a6d | 2068 | struct r5conf *conf = sh->raid_conf; |
ac6b53b6 | 2069 | int level = conf->level; |
d6f38f31 DW |
2070 | struct raid5_percpu *percpu; |
2071 | unsigned long cpu; | |
91c00924 | 2072 | |
d6f38f31 DW |
2073 | cpu = get_cpu(); |
2074 | percpu = per_cpu_ptr(conf->percpu, cpu); | |
83de75cc | 2075 | if (test_bit(STRIPE_OP_BIOFILL, &ops_request)) { |
91c00924 DW |
2076 | ops_run_biofill(sh); |
2077 | overlap_clear++; | |
2078 | } | |
2079 | ||
7b3a871e | 2080 | if (test_bit(STRIPE_OP_COMPUTE_BLK, &ops_request)) { |
ac6b53b6 DW |
2081 | if (level < 6) |
2082 | tx = ops_run_compute5(sh, percpu); | |
2083 | else { | |
2084 | if (sh->ops.target2 < 0 || sh->ops.target < 0) | |
2085 | tx = ops_run_compute6_1(sh, percpu); | |
2086 | else | |
2087 | tx = ops_run_compute6_2(sh, percpu); | |
2088 | } | |
2089 | /* terminate the chain if reconstruct is not set to be run */ | |
2090 | if (tx && !test_bit(STRIPE_OP_RECONSTRUCT, &ops_request)) | |
7b3a871e DW |
2091 | async_tx_ack(tx); |
2092 | } | |
91c00924 | 2093 | |
3418d036 AP |
2094 | if (test_bit(STRIPE_OP_PARTIAL_PARITY, &ops_request)) |
2095 | tx = ops_run_partial_parity(sh, percpu, tx); | |
2096 | ||
584acdd4 MS |
2097 | if (test_bit(STRIPE_OP_PREXOR, &ops_request)) { |
2098 | if (level < 6) | |
2099 | tx = ops_run_prexor5(sh, percpu, tx); | |
2100 | else | |
2101 | tx = ops_run_prexor6(sh, percpu, tx); | |
2102 | } | |
91c00924 | 2103 | |
600aa109 | 2104 | if (test_bit(STRIPE_OP_BIODRAIN, &ops_request)) { |
d8ee0728 | 2105 | tx = ops_run_biodrain(sh, tx); |
91c00924 DW |
2106 | overlap_clear++; |
2107 | } | |
2108 | ||
ac6b53b6 DW |
2109 | if (test_bit(STRIPE_OP_RECONSTRUCT, &ops_request)) { |
2110 | if (level < 6) | |
2111 | ops_run_reconstruct5(sh, percpu, tx); | |
2112 | else | |
2113 | ops_run_reconstruct6(sh, percpu, tx); | |
2114 | } | |
91c00924 | 2115 | |
ac6b53b6 DW |
2116 | if (test_bit(STRIPE_OP_CHECK, &ops_request)) { |
2117 | if (sh->check_state == check_state_run) | |
2118 | ops_run_check_p(sh, percpu); | |
2119 | else if (sh->check_state == check_state_run_q) | |
2120 | ops_run_check_pq(sh, percpu, 0); | |
2121 | else if (sh->check_state == check_state_run_pq) | |
2122 | ops_run_check_pq(sh, percpu, 1); | |
2123 | else | |
2124 | BUG(); | |
2125 | } | |
91c00924 | 2126 | |
59fc630b | 2127 | if (overlap_clear && !sh->batch_head) |
91c00924 DW |
2128 | for (i = disks; i--; ) { |
2129 | struct r5dev *dev = &sh->dev[i]; | |
2130 | if (test_and_clear_bit(R5_Overlap, &dev->flags)) | |
2131 | wake_up(&sh->raid_conf->wait_for_overlap); | |
2132 | } | |
d6f38f31 | 2133 | put_cpu(); |
91c00924 DW |
2134 | } |
2135 | ||
5f9d1fde SL |
2136 | static struct stripe_head *alloc_stripe(struct kmem_cache *sc, gfp_t gfp, |
2137 | int disks) | |
f18c1a35 N |
2138 | { |
2139 | struct stripe_head *sh; | |
5f9d1fde | 2140 | int i; |
f18c1a35 N |
2141 | |
2142 | sh = kmem_cache_zalloc(sc, gfp); | |
2143 | if (sh) { | |
2144 | spin_lock_init(&sh->stripe_lock); | |
2145 | spin_lock_init(&sh->batch_lock); | |
2146 | INIT_LIST_HEAD(&sh->batch_list); | |
2147 | INIT_LIST_HEAD(&sh->lru); | |
a39f7afd | 2148 | INIT_LIST_HEAD(&sh->r5c); |
d7bd398e | 2149 | INIT_LIST_HEAD(&sh->log_list); |
f18c1a35 | 2150 | atomic_set(&sh->count, 1); |
a39f7afd | 2151 | sh->log_start = MaxSector; |
5f9d1fde SL |
2152 | for (i = 0; i < disks; i++) { |
2153 | struct r5dev *dev = &sh->dev[i]; | |
2154 | ||
3a83f467 ML |
2155 | bio_init(&dev->req, &dev->vec, 1); |
2156 | bio_init(&dev->rreq, &dev->rvec, 1); | |
5f9d1fde | 2157 | } |
f18c1a35 N |
2158 | } |
2159 | return sh; | |
2160 | } | |
486f0644 | 2161 | static int grow_one_stripe(struct r5conf *conf, gfp_t gfp) |
1da177e4 LT |
2162 | { |
2163 | struct stripe_head *sh; | |
f18c1a35 | 2164 | |
5f9d1fde | 2165 | sh = alloc_stripe(conf->slab_cache, gfp, conf->pool_size); |
3f294f4f N |
2166 | if (!sh) |
2167 | return 0; | |
6ce32846 | 2168 | |
3f294f4f | 2169 | sh->raid_conf = conf; |
3f294f4f | 2170 | |
a9683a79 | 2171 | if (grow_buffers(sh, gfp)) { |
e4e11e38 | 2172 | shrink_buffers(sh); |
3f294f4f N |
2173 | kmem_cache_free(conf->slab_cache, sh); |
2174 | return 0; | |
2175 | } | |
486f0644 N |
2176 | sh->hash_lock_index = |
2177 | conf->max_nr_stripes % NR_STRIPE_HASH_LOCKS; | |
3f294f4f | 2178 | /* we just created an active stripe so... */ |
3f294f4f | 2179 | atomic_inc(&conf->active_stripes); |
59fc630b | 2180 | |
6d036f7d | 2181 | raid5_release_stripe(sh); |
486f0644 | 2182 | conf->max_nr_stripes++; |
3f294f4f N |
2183 | return 1; |
2184 | } | |
2185 | ||
d1688a6d | 2186 | static int grow_stripes(struct r5conf *conf, int num) |
3f294f4f | 2187 | { |
e18b890b | 2188 | struct kmem_cache *sc; |
5e5e3e78 | 2189 | int devs = max(conf->raid_disks, conf->previous_raid_disks); |
1da177e4 | 2190 | |
f4be6b43 N |
2191 | if (conf->mddev->gendisk) |
2192 | sprintf(conf->cache_name[0], | |
2193 | "raid%d-%s", conf->level, mdname(conf->mddev)); | |
2194 | else | |
2195 | sprintf(conf->cache_name[0], | |
2196 | "raid%d-%p", conf->level, conf->mddev); | |
2197 | sprintf(conf->cache_name[1], "%s-alt", conf->cache_name[0]); | |
2198 | ||
ad01c9e3 N |
2199 | conf->active_name = 0; |
2200 | sc = kmem_cache_create(conf->cache_name[conf->active_name], | |
1da177e4 | 2201 | sizeof(struct stripe_head)+(devs-1)*sizeof(struct r5dev), |
20c2df83 | 2202 | 0, 0, NULL); |
1da177e4 LT |
2203 | if (!sc) |
2204 | return 1; | |
2205 | conf->slab_cache = sc; | |
ad01c9e3 | 2206 | conf->pool_size = devs; |
486f0644 N |
2207 | while (num--) |
2208 | if (!grow_one_stripe(conf, GFP_KERNEL)) | |
1da177e4 | 2209 | return 1; |
486f0644 | 2210 | |
1da177e4 LT |
2211 | return 0; |
2212 | } | |
29269553 | 2213 | |
d6f38f31 DW |
2214 | /** |
2215 | * scribble_len - return the required size of the scribble region | |
2216 | * @num - total number of disks in the array | |
2217 | * | |
2218 | * The size must be enough to contain: | |
2219 | * 1/ a struct page pointer for each device in the array +2 | |
2220 | * 2/ room to convert each entry in (1) to its corresponding dma | |
2221 | * (dma_map_page()) or page (page_address()) address. | |
2222 | * | |
2223 | * Note: the +2 is for the destination buffers of the ddf/raid6 case where we | |
2224 | * calculate over all devices (not just the data blocks), using zeros in place | |
2225 | * of the P and Q blocks. | |
2226 | */ | |
46d5b785 | 2227 | static struct flex_array *scribble_alloc(int num, int cnt, gfp_t flags) |
d6f38f31 | 2228 | { |
46d5b785 | 2229 | struct flex_array *ret; |
d6f38f31 DW |
2230 | size_t len; |
2231 | ||
2232 | len = sizeof(struct page *) * (num+2) + sizeof(addr_conv_t) * (num+2); | |
46d5b785 | 2233 | ret = flex_array_alloc(len, cnt, flags); |
2234 | if (!ret) | |
2235 | return NULL; | |
2236 | /* always prealloc all elements, so no locking is required */ | |
2237 | if (flex_array_prealloc(ret, 0, cnt, flags)) { | |
2238 | flex_array_free(ret); | |
2239 | return NULL; | |
2240 | } | |
2241 | return ret; | |
d6f38f31 DW |
2242 | } |
2243 | ||
738a2738 N |
2244 | static int resize_chunks(struct r5conf *conf, int new_disks, int new_sectors) |
2245 | { | |
2246 | unsigned long cpu; | |
2247 | int err = 0; | |
2248 | ||
27a353c0 SL |
2249 | /* |
2250 | * Never shrink. And mddev_suspend() could deadlock if this is called | |
2251 | * from raid5d. In that case, scribble_disks and scribble_sectors | |
2252 | * should equal to new_disks and new_sectors | |
2253 | */ | |
2254 | if (conf->scribble_disks >= new_disks && | |
2255 | conf->scribble_sectors >= new_sectors) | |
2256 | return 0; | |
738a2738 N |
2257 | mddev_suspend(conf->mddev); |
2258 | get_online_cpus(); | |
2259 | for_each_present_cpu(cpu) { | |
2260 | struct raid5_percpu *percpu; | |
2261 | struct flex_array *scribble; | |
2262 | ||
2263 | percpu = per_cpu_ptr(conf->percpu, cpu); | |
2264 | scribble = scribble_alloc(new_disks, | |
2265 | new_sectors / STRIPE_SECTORS, | |
2266 | GFP_NOIO); | |
2267 | ||
2268 | if (scribble) { | |
2269 | flex_array_free(percpu->scribble); | |
2270 | percpu->scribble = scribble; | |
2271 | } else { | |
2272 | err = -ENOMEM; | |
2273 | break; | |
2274 | } | |
2275 | } | |
2276 | put_online_cpus(); | |
2277 | mddev_resume(conf->mddev); | |
27a353c0 SL |
2278 | if (!err) { |
2279 | conf->scribble_disks = new_disks; | |
2280 | conf->scribble_sectors = new_sectors; | |
2281 | } | |
738a2738 N |
2282 | return err; |
2283 | } | |
2284 | ||
d1688a6d | 2285 | static int resize_stripes(struct r5conf *conf, int newsize) |
ad01c9e3 N |
2286 | { |
2287 | /* Make all the stripes able to hold 'newsize' devices. | |
2288 | * New slots in each stripe get 'page' set to a new page. | |
2289 | * | |
2290 | * This happens in stages: | |
2291 | * 1/ create a new kmem_cache and allocate the required number of | |
2292 | * stripe_heads. | |
83f0d77a | 2293 | * 2/ gather all the old stripe_heads and transfer the pages across |
ad01c9e3 N |
2294 | * to the new stripe_heads. This will have the side effect of |
2295 | * freezing the array as once all stripe_heads have been collected, | |
2296 | * no IO will be possible. Old stripe heads are freed once their | |
2297 | * pages have been transferred over, and the old kmem_cache is | |
2298 | * freed when all stripes are done. | |
2299 | * 3/ reallocate conf->disks to be suitable bigger. If this fails, | |
2300 | * we simple return a failre status - no need to clean anything up. | |
2301 | * 4/ allocate new pages for the new slots in the new stripe_heads. | |
2302 | * If this fails, we don't bother trying the shrink the | |
2303 | * stripe_heads down again, we just leave them as they are. | |
2304 | * As each stripe_head is processed the new one is released into | |
2305 | * active service. | |
2306 | * | |
2307 | * Once step2 is started, we cannot afford to wait for a write, | |
2308 | * so we use GFP_NOIO allocations. | |
2309 | */ | |
2310 | struct stripe_head *osh, *nsh; | |
2311 | LIST_HEAD(newstripes); | |
2312 | struct disk_info *ndisks; | |
b5470dc5 | 2313 | int err; |
e18b890b | 2314 | struct kmem_cache *sc; |
ad01c9e3 | 2315 | int i; |
566c09c5 | 2316 | int hash, cnt; |
ad01c9e3 N |
2317 | |
2318 | if (newsize <= conf->pool_size) | |
2319 | return 0; /* never bother to shrink */ | |
2320 | ||
b5470dc5 DW |
2321 | err = md_allow_write(conf->mddev); |
2322 | if (err) | |
2323 | return err; | |
2a2275d6 | 2324 | |
ad01c9e3 N |
2325 | /* Step 1 */ |
2326 | sc = kmem_cache_create(conf->cache_name[1-conf->active_name], | |
2327 | sizeof(struct stripe_head)+(newsize-1)*sizeof(struct r5dev), | |
20c2df83 | 2328 | 0, 0, NULL); |
ad01c9e3 N |
2329 | if (!sc) |
2330 | return -ENOMEM; | |
2331 | ||
2d5b569b N |
2332 | /* Need to ensure auto-resizing doesn't interfere */ |
2333 | mutex_lock(&conf->cache_size_mutex); | |
2334 | ||
ad01c9e3 | 2335 | for (i = conf->max_nr_stripes; i; i--) { |
5f9d1fde | 2336 | nsh = alloc_stripe(sc, GFP_KERNEL, newsize); |
ad01c9e3 N |
2337 | if (!nsh) |
2338 | break; | |
2339 | ||
ad01c9e3 | 2340 | nsh->raid_conf = conf; |
ad01c9e3 N |
2341 | list_add(&nsh->lru, &newstripes); |
2342 | } | |
2343 | if (i) { | |
2344 | /* didn't get enough, give up */ | |
2345 | while (!list_empty(&newstripes)) { | |
2346 | nsh = list_entry(newstripes.next, struct stripe_head, lru); | |
2347 | list_del(&nsh->lru); | |
2348 | kmem_cache_free(sc, nsh); | |
2349 | } | |
2350 | kmem_cache_destroy(sc); | |
2d5b569b | 2351 | mutex_unlock(&conf->cache_size_mutex); |
ad01c9e3 N |
2352 | return -ENOMEM; |
2353 | } | |
2354 | /* Step 2 - Must use GFP_NOIO now. | |
2355 | * OK, we have enough stripes, start collecting inactive | |
2356 | * stripes and copying them over | |
2357 | */ | |
566c09c5 SL |
2358 | hash = 0; |
2359 | cnt = 0; | |
ad01c9e3 | 2360 | list_for_each_entry(nsh, &newstripes, lru) { |
566c09c5 | 2361 | lock_device_hash_lock(conf, hash); |
6ab2a4b8 | 2362 | wait_event_cmd(conf->wait_for_stripe, |
566c09c5 SL |
2363 | !list_empty(conf->inactive_list + hash), |
2364 | unlock_device_hash_lock(conf, hash), | |
2365 | lock_device_hash_lock(conf, hash)); | |
2366 | osh = get_free_stripe(conf, hash); | |
2367 | unlock_device_hash_lock(conf, hash); | |
f18c1a35 | 2368 | |
d592a996 | 2369 | for(i=0; i<conf->pool_size; i++) { |
ad01c9e3 | 2370 | nsh->dev[i].page = osh->dev[i].page; |
d592a996 SL |
2371 | nsh->dev[i].orig_page = osh->dev[i].page; |
2372 | } | |
566c09c5 | 2373 | nsh->hash_lock_index = hash; |
ad01c9e3 | 2374 | kmem_cache_free(conf->slab_cache, osh); |
566c09c5 SL |
2375 | cnt++; |
2376 | if (cnt >= conf->max_nr_stripes / NR_STRIPE_HASH_LOCKS + | |
2377 | !!((conf->max_nr_stripes % NR_STRIPE_HASH_LOCKS) > hash)) { | |
2378 | hash++; | |
2379 | cnt = 0; | |
2380 | } | |
ad01c9e3 N |
2381 | } |
2382 | kmem_cache_destroy(conf->slab_cache); | |
2383 | ||
2384 | /* Step 3. | |
2385 | * At this point, we are holding all the stripes so the array | |
2386 | * is completely stalled, so now is a good time to resize | |
d6f38f31 | 2387 | * conf->disks and the scribble region |
ad01c9e3 N |
2388 | */ |
2389 | ndisks = kzalloc(newsize * sizeof(struct disk_info), GFP_NOIO); | |
2390 | if (ndisks) { | |
d7bd398e | 2391 | for (i = 0; i < conf->pool_size; i++) |
ad01c9e3 | 2392 | ndisks[i] = conf->disks[i]; |
d7bd398e SL |
2393 | |
2394 | for (i = conf->pool_size; i < newsize; i++) { | |
2395 | ndisks[i].extra_page = alloc_page(GFP_NOIO); | |
2396 | if (!ndisks[i].extra_page) | |
2397 | err = -ENOMEM; | |
2398 | } | |
2399 | ||
2400 | if (err) { | |
2401 | for (i = conf->pool_size; i < newsize; i++) | |
2402 | if (ndisks[i].extra_page) | |
2403 | put_page(ndisks[i].extra_page); | |
2404 | kfree(ndisks); | |
2405 | } else { | |
2406 | kfree(conf->disks); | |
2407 | conf->disks = ndisks; | |
2408 | } | |
ad01c9e3 N |
2409 | } else |
2410 | err = -ENOMEM; | |
2411 | ||
2d5b569b | 2412 | mutex_unlock(&conf->cache_size_mutex); |
ad01c9e3 N |
2413 | /* Step 4, return new stripes to service */ |
2414 | while(!list_empty(&newstripes)) { | |
2415 | nsh = list_entry(newstripes.next, struct stripe_head, lru); | |
2416 | list_del_init(&nsh->lru); | |
d6f38f31 | 2417 | |
ad01c9e3 N |
2418 | for (i=conf->raid_disks; i < newsize; i++) |
2419 | if (nsh->dev[i].page == NULL) { | |
2420 | struct page *p = alloc_page(GFP_NOIO); | |
2421 | nsh->dev[i].page = p; | |
d592a996 | 2422 | nsh->dev[i].orig_page = p; |
ad01c9e3 N |
2423 | if (!p) |
2424 | err = -ENOMEM; | |
2425 | } | |
6d036f7d | 2426 | raid5_release_stripe(nsh); |
ad01c9e3 N |
2427 | } |
2428 | /* critical section pass, GFP_NOIO no longer needed */ | |
2429 | ||
2430 | conf->slab_cache = sc; | |
2431 | conf->active_name = 1-conf->active_name; | |
6e9eac2d N |
2432 | if (!err) |
2433 | conf->pool_size = newsize; | |
ad01c9e3 N |
2434 | return err; |
2435 | } | |
1da177e4 | 2436 | |
486f0644 | 2437 | static int drop_one_stripe(struct r5conf *conf) |
1da177e4 LT |
2438 | { |
2439 | struct stripe_head *sh; | |
49895bcc | 2440 | int hash = (conf->max_nr_stripes - 1) & STRIPE_HASH_LOCKS_MASK; |
1da177e4 | 2441 | |
566c09c5 SL |
2442 | spin_lock_irq(conf->hash_locks + hash); |
2443 | sh = get_free_stripe(conf, hash); | |
2444 | spin_unlock_irq(conf->hash_locks + hash); | |
3f294f4f N |
2445 | if (!sh) |
2446 | return 0; | |
78bafebd | 2447 | BUG_ON(atomic_read(&sh->count)); |
e4e11e38 | 2448 | shrink_buffers(sh); |
3f294f4f N |
2449 | kmem_cache_free(conf->slab_cache, sh); |
2450 | atomic_dec(&conf->active_stripes); | |
486f0644 | 2451 | conf->max_nr_stripes--; |
3f294f4f N |
2452 | return 1; |
2453 | } | |
2454 | ||
d1688a6d | 2455 | static void shrink_stripes(struct r5conf *conf) |
3f294f4f | 2456 | { |
486f0644 N |
2457 | while (conf->max_nr_stripes && |
2458 | drop_one_stripe(conf)) | |
2459 | ; | |
3f294f4f | 2460 | |
644df1a8 | 2461 | kmem_cache_destroy(conf->slab_cache); |
1da177e4 LT |
2462 | conf->slab_cache = NULL; |
2463 | } | |
2464 | ||
4246a0b6 | 2465 | static void raid5_end_read_request(struct bio * bi) |
1da177e4 | 2466 | { |
99c0fb5f | 2467 | struct stripe_head *sh = bi->bi_private; |
d1688a6d | 2468 | struct r5conf *conf = sh->raid_conf; |
7ecaa1e6 | 2469 | int disks = sh->disks, i; |
d6950432 | 2470 | char b[BDEVNAME_SIZE]; |
dd054fce | 2471 | struct md_rdev *rdev = NULL; |
05616be5 | 2472 | sector_t s; |
1da177e4 LT |
2473 | |
2474 | for (i=0 ; i<disks; i++) | |
2475 | if (bi == &sh->dev[i].req) | |
2476 | break; | |
2477 | ||
4246a0b6 | 2478 | pr_debug("end_read_request %llu/%d, count: %d, error %d.\n", |
45b4233c | 2479 | (unsigned long long)sh->sector, i, atomic_read(&sh->count), |
4246a0b6 | 2480 | bi->bi_error); |
1da177e4 | 2481 | if (i == disks) { |
5f9d1fde | 2482 | bio_reset(bi); |
1da177e4 | 2483 | BUG(); |
6712ecf8 | 2484 | return; |
1da177e4 | 2485 | } |
14a75d3e | 2486 | if (test_bit(R5_ReadRepl, &sh->dev[i].flags)) |
dd054fce N |
2487 | /* If replacement finished while this request was outstanding, |
2488 | * 'replacement' might be NULL already. | |
2489 | * In that case it moved down to 'rdev'. | |
2490 | * rdev is not removed until all requests are finished. | |
2491 | */ | |
14a75d3e | 2492 | rdev = conf->disks[i].replacement; |
dd054fce | 2493 | if (!rdev) |
14a75d3e | 2494 | rdev = conf->disks[i].rdev; |
1da177e4 | 2495 | |
05616be5 N |
2496 | if (use_new_offset(conf, sh)) |
2497 | s = sh->sector + rdev->new_data_offset; | |
2498 | else | |
2499 | s = sh->sector + rdev->data_offset; | |
4246a0b6 | 2500 | if (!bi->bi_error) { |
1da177e4 | 2501 | set_bit(R5_UPTODATE, &sh->dev[i].flags); |
4e5314b5 | 2502 | if (test_bit(R5_ReadError, &sh->dev[i].flags)) { |
14a75d3e N |
2503 | /* Note that this cannot happen on a |
2504 | * replacement device. We just fail those on | |
2505 | * any error | |
2506 | */ | |
cc6167b4 N |
2507 | pr_info_ratelimited( |
2508 | "md/raid:%s: read error corrected (%lu sectors at %llu on %s)\n", | |
8bda470e | 2509 | mdname(conf->mddev), STRIPE_SECTORS, |
05616be5 | 2510 | (unsigned long long)s, |
8bda470e | 2511 | bdevname(rdev->bdev, b)); |
ddd5115f | 2512 | atomic_add(STRIPE_SECTORS, &rdev->corrected_errors); |
4e5314b5 N |
2513 | clear_bit(R5_ReadError, &sh->dev[i].flags); |
2514 | clear_bit(R5_ReWrite, &sh->dev[i].flags); | |
3f9e7c14 | 2515 | } else if (test_bit(R5_ReadNoMerge, &sh->dev[i].flags)) |
2516 | clear_bit(R5_ReadNoMerge, &sh->dev[i].flags); | |
2517 | ||
86aa1397 SL |
2518 | if (test_bit(R5_InJournal, &sh->dev[i].flags)) |
2519 | /* | |
2520 | * end read for a page in journal, this | |
2521 | * must be preparing for prexor in rmw | |
2522 | */ | |
2523 | set_bit(R5_OrigPageUPTDODATE, &sh->dev[i].flags); | |
2524 | ||
14a75d3e N |
2525 | if (atomic_read(&rdev->read_errors)) |
2526 | atomic_set(&rdev->read_errors, 0); | |
1da177e4 | 2527 | } else { |
14a75d3e | 2528 | const char *bdn = bdevname(rdev->bdev, b); |
ba22dcbf | 2529 | int retry = 0; |
2e8ac303 | 2530 | int set_bad = 0; |
d6950432 | 2531 | |
1da177e4 | 2532 | clear_bit(R5_UPTODATE, &sh->dev[i].flags); |
d6950432 | 2533 | atomic_inc(&rdev->read_errors); |
14a75d3e | 2534 | if (test_bit(R5_ReadRepl, &sh->dev[i].flags)) |
cc6167b4 N |
2535 | pr_warn_ratelimited( |
2536 | "md/raid:%s: read error on replacement device (sector %llu on %s).\n", | |
14a75d3e | 2537 | mdname(conf->mddev), |
05616be5 | 2538 | (unsigned long long)s, |
14a75d3e | 2539 | bdn); |
2e8ac303 | 2540 | else if (conf->mddev->degraded >= conf->max_degraded) { |
2541 | set_bad = 1; | |
cc6167b4 N |
2542 | pr_warn_ratelimited( |
2543 | "md/raid:%s: read error not correctable (sector %llu on %s).\n", | |
8bda470e | 2544 | mdname(conf->mddev), |
05616be5 | 2545 | (unsigned long long)s, |
8bda470e | 2546 | bdn); |
2e8ac303 | 2547 | } else if (test_bit(R5_ReWrite, &sh->dev[i].flags)) { |
4e5314b5 | 2548 | /* Oh, no!!! */ |
2e8ac303 | 2549 | set_bad = 1; |
cc6167b4 N |
2550 | pr_warn_ratelimited( |
2551 | "md/raid:%s: read error NOT corrected!! (sector %llu on %s).\n", | |
8bda470e | 2552 | mdname(conf->mddev), |
05616be5 | 2553 | (unsigned long long)s, |
8bda470e | 2554 | bdn); |
2e8ac303 | 2555 | } else if (atomic_read(&rdev->read_errors) |
ba22dcbf | 2556 | > conf->max_nr_stripes) |
cc6167b4 | 2557 | pr_warn("md/raid:%s: Too many read errors, failing device %s.\n", |
d6950432 | 2558 | mdname(conf->mddev), bdn); |
ba22dcbf N |
2559 | else |
2560 | retry = 1; | |
edfa1f65 BY |
2561 | if (set_bad && test_bit(In_sync, &rdev->flags) |
2562 | && !test_bit(R5_ReadNoMerge, &sh->dev[i].flags)) | |
2563 | retry = 1; | |
ba22dcbf | 2564 | if (retry) |
3f9e7c14 | 2565 | if (test_bit(R5_ReadNoMerge, &sh->dev[i].flags)) { |
2566 | set_bit(R5_ReadError, &sh->dev[i].flags); | |
2567 | clear_bit(R5_ReadNoMerge, &sh->dev[i].flags); | |
2568 | } else | |
2569 | set_bit(R5_ReadNoMerge, &sh->dev[i].flags); | |
ba22dcbf | 2570 | else { |
4e5314b5 N |
2571 | clear_bit(R5_ReadError, &sh->dev[i].flags); |
2572 | clear_bit(R5_ReWrite, &sh->dev[i].flags); | |
2e8ac303 | 2573 | if (!(set_bad |
2574 | && test_bit(In_sync, &rdev->flags) | |
2575 | && rdev_set_badblocks( | |
2576 | rdev, sh->sector, STRIPE_SECTORS, 0))) | |
2577 | md_error(conf->mddev, rdev); | |
ba22dcbf | 2578 | } |
1da177e4 | 2579 | } |
14a75d3e | 2580 | rdev_dec_pending(rdev, conf->mddev); |
c9445555 | 2581 | bio_reset(bi); |
1da177e4 LT |
2582 | clear_bit(R5_LOCKED, &sh->dev[i].flags); |
2583 | set_bit(STRIPE_HANDLE, &sh->state); | |
6d036f7d | 2584 | raid5_release_stripe(sh); |
1da177e4 LT |
2585 | } |
2586 | ||
4246a0b6 | 2587 | static void raid5_end_write_request(struct bio *bi) |
1da177e4 | 2588 | { |
99c0fb5f | 2589 | struct stripe_head *sh = bi->bi_private; |
d1688a6d | 2590 | struct r5conf *conf = sh->raid_conf; |
7ecaa1e6 | 2591 | int disks = sh->disks, i; |
977df362 | 2592 | struct md_rdev *uninitialized_var(rdev); |
b84db560 N |
2593 | sector_t first_bad; |
2594 | int bad_sectors; | |
977df362 | 2595 | int replacement = 0; |
1da177e4 | 2596 | |
977df362 N |
2597 | for (i = 0 ; i < disks; i++) { |
2598 | if (bi == &sh->dev[i].req) { | |
2599 | rdev = conf->disks[i].rdev; | |
1da177e4 | 2600 | break; |
977df362 N |
2601 | } |
2602 | if (bi == &sh->dev[i].rreq) { | |
2603 | rdev = conf->disks[i].replacement; | |
dd054fce N |
2604 | if (rdev) |
2605 | replacement = 1; | |
2606 | else | |
2607 | /* rdev was removed and 'replacement' | |
2608 | * replaced it. rdev is not removed | |
2609 | * until all requests are finished. | |
2610 | */ | |
2611 | rdev = conf->disks[i].rdev; | |
977df362 N |
2612 | break; |
2613 | } | |
2614 | } | |
4246a0b6 | 2615 | pr_debug("end_write_request %llu/%d, count %d, error: %d.\n", |
1da177e4 | 2616 | (unsigned long long)sh->sector, i, atomic_read(&sh->count), |
4246a0b6 | 2617 | bi->bi_error); |
1da177e4 | 2618 | if (i == disks) { |
5f9d1fde | 2619 | bio_reset(bi); |
1da177e4 | 2620 | BUG(); |
6712ecf8 | 2621 | return; |
1da177e4 LT |
2622 | } |
2623 | ||
977df362 | 2624 | if (replacement) { |
4246a0b6 | 2625 | if (bi->bi_error) |
977df362 N |
2626 | md_error(conf->mddev, rdev); |
2627 | else if (is_badblock(rdev, sh->sector, | |
2628 | STRIPE_SECTORS, | |
2629 | &first_bad, &bad_sectors)) | |
2630 | set_bit(R5_MadeGoodRepl, &sh->dev[i].flags); | |
2631 | } else { | |
4246a0b6 | 2632 | if (bi->bi_error) { |
9f97e4b1 | 2633 | set_bit(STRIPE_DEGRADED, &sh->state); |
977df362 N |
2634 | set_bit(WriteErrorSeen, &rdev->flags); |
2635 | set_bit(R5_WriteError, &sh->dev[i].flags); | |
3a6de292 N |
2636 | if (!test_and_set_bit(WantReplacement, &rdev->flags)) |
2637 | set_bit(MD_RECOVERY_NEEDED, | |
2638 | &rdev->mddev->recovery); | |
977df362 N |
2639 | } else if (is_badblock(rdev, sh->sector, |
2640 | STRIPE_SECTORS, | |
c0b32972 | 2641 | &first_bad, &bad_sectors)) { |
977df362 | 2642 | set_bit(R5_MadeGood, &sh->dev[i].flags); |
c0b32972 N |
2643 | if (test_bit(R5_ReadError, &sh->dev[i].flags)) |
2644 | /* That was a successful write so make | |
2645 | * sure it looks like we already did | |
2646 | * a re-write. | |
2647 | */ | |
2648 | set_bit(R5_ReWrite, &sh->dev[i].flags); | |
2649 | } | |
977df362 N |
2650 | } |
2651 | rdev_dec_pending(rdev, conf->mddev); | |
1da177e4 | 2652 | |
4246a0b6 | 2653 | if (sh->batch_head && bi->bi_error && !replacement) |
72ac7330 | 2654 | set_bit(STRIPE_BATCH_ERR, &sh->batch_head->state); |
2655 | ||
c9445555 | 2656 | bio_reset(bi); |
977df362 N |
2657 | if (!test_and_clear_bit(R5_DOUBLE_LOCKED, &sh->dev[i].flags)) |
2658 | clear_bit(R5_LOCKED, &sh->dev[i].flags); | |
1da177e4 | 2659 | set_bit(STRIPE_HANDLE, &sh->state); |
6d036f7d | 2660 | raid5_release_stripe(sh); |
59fc630b | 2661 | |
2662 | if (sh->batch_head && sh != sh->batch_head) | |
6d036f7d | 2663 | raid5_release_stripe(sh->batch_head); |
1da177e4 LT |
2664 | } |
2665 | ||
784052ec | 2666 | static void raid5_build_block(struct stripe_head *sh, int i, int previous) |
1da177e4 LT |
2667 | { |
2668 | struct r5dev *dev = &sh->dev[i]; | |
2669 | ||
1da177e4 | 2670 | dev->flags = 0; |
6d036f7d | 2671 | dev->sector = raid5_compute_blocknr(sh, i, previous); |
1da177e4 LT |
2672 | } |
2673 | ||
849674e4 | 2674 | static void raid5_error(struct mddev *mddev, struct md_rdev *rdev) |
1da177e4 LT |
2675 | { |
2676 | char b[BDEVNAME_SIZE]; | |
d1688a6d | 2677 | struct r5conf *conf = mddev->private; |
908f4fbd | 2678 | unsigned long flags; |
0c55e022 | 2679 | pr_debug("raid456: error called\n"); |
1da177e4 | 2680 | |
908f4fbd N |
2681 | spin_lock_irqsave(&conf->device_lock, flags); |
2682 | clear_bit(In_sync, &rdev->flags); | |
2e38a37f | 2683 | mddev->degraded = raid5_calc_degraded(conf); |
908f4fbd N |
2684 | spin_unlock_irqrestore(&conf->device_lock, flags); |
2685 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); | |
2686 | ||
de393cde | 2687 | set_bit(Blocked, &rdev->flags); |
6f8d0c77 | 2688 | set_bit(Faulty, &rdev->flags); |
2953079c SL |
2689 | set_mask_bits(&mddev->sb_flags, 0, |
2690 | BIT(MD_SB_CHANGE_DEVS) | BIT(MD_SB_CHANGE_PENDING)); | |
cc6167b4 N |
2691 | pr_crit("md/raid:%s: Disk failure on %s, disabling device.\n" |
2692 | "md/raid:%s: Operation continuing on %d devices.\n", | |
2693 | mdname(mddev), | |
2694 | bdevname(rdev->bdev, b), | |
2695 | mdname(mddev), | |
2696 | conf->raid_disks - mddev->degraded); | |
2e38a37f | 2697 | r5c_update_on_rdev_error(mddev); |
16a53ecc | 2698 | } |
1da177e4 LT |
2699 | |
2700 | /* | |
2701 | * Input: a 'big' sector number, | |
2702 | * Output: index of the data and parity disk, and the sector # in them. | |
2703 | */ | |
6d036f7d SL |
2704 | sector_t raid5_compute_sector(struct r5conf *conf, sector_t r_sector, |
2705 | int previous, int *dd_idx, | |
2706 | struct stripe_head *sh) | |
1da177e4 | 2707 | { |
6e3b96ed | 2708 | sector_t stripe, stripe2; |
35f2a591 | 2709 | sector_t chunk_number; |
1da177e4 | 2710 | unsigned int chunk_offset; |
911d4ee8 | 2711 | int pd_idx, qd_idx; |
67cc2b81 | 2712 | int ddf_layout = 0; |
1da177e4 | 2713 | sector_t new_sector; |
e183eaed N |
2714 | int algorithm = previous ? conf->prev_algo |
2715 | : conf->algorithm; | |
09c9e5fa AN |
2716 | int sectors_per_chunk = previous ? conf->prev_chunk_sectors |
2717 | : conf->chunk_sectors; | |
112bf897 N |
2718 | int raid_disks = previous ? conf->previous_raid_disks |
2719 | : conf->raid_disks; | |
2720 | int data_disks = raid_disks - conf->max_degraded; | |
1da177e4 LT |
2721 | |
2722 | /* First compute the information on this sector */ | |
2723 | ||
2724 | /* | |
2725 | * Compute the chunk number and the sector offset inside the chunk | |
2726 | */ | |
2727 | chunk_offset = sector_div(r_sector, sectors_per_chunk); | |
2728 | chunk_number = r_sector; | |
1da177e4 LT |
2729 | |
2730 | /* | |
2731 | * Compute the stripe number | |
2732 | */ | |
35f2a591 N |
2733 | stripe = chunk_number; |
2734 | *dd_idx = sector_div(stripe, data_disks); | |
6e3b96ed | 2735 | stripe2 = stripe; |
1da177e4 LT |
2736 | /* |
2737 | * Select the parity disk based on the user selected algorithm. | |
2738 | */ | |
84789554 | 2739 | pd_idx = qd_idx = -1; |
16a53ecc N |
2740 | switch(conf->level) { |
2741 | case 4: | |
911d4ee8 | 2742 | pd_idx = data_disks; |
16a53ecc N |
2743 | break; |
2744 | case 5: | |
e183eaed | 2745 | switch (algorithm) { |
1da177e4 | 2746 | case ALGORITHM_LEFT_ASYMMETRIC: |
6e3b96ed | 2747 | pd_idx = data_disks - sector_div(stripe2, raid_disks); |
911d4ee8 | 2748 | if (*dd_idx >= pd_idx) |
1da177e4 LT |
2749 | (*dd_idx)++; |
2750 | break; | |
2751 | case ALGORITHM_RIGHT_ASYMMETRIC: | |
6e3b96ed | 2752 | pd_idx = sector_div(stripe2, raid_disks); |
911d4ee8 | 2753 | if (*dd_idx >= pd_idx) |
1da177e4 LT |
2754 | (*dd_idx)++; |
2755 | break; | |
2756 | case ALGORITHM_LEFT_SYMMETRIC: | |
6e3b96ed | 2757 | pd_idx = data_disks - sector_div(stripe2, raid_disks); |
911d4ee8 | 2758 | *dd_idx = (pd_idx + 1 + *dd_idx) % raid_disks; |
1da177e4 LT |
2759 | break; |
2760 | case ALGORITHM_RIGHT_SYMMETRIC: | |
6e3b96ed | 2761 | pd_idx = sector_div(stripe2, raid_disks); |
911d4ee8 | 2762 | *dd_idx = (pd_idx + 1 + *dd_idx) % raid_disks; |
1da177e4 | 2763 | break; |
99c0fb5f N |
2764 | case ALGORITHM_PARITY_0: |
2765 | pd_idx = 0; | |
2766 | (*dd_idx)++; | |
2767 | break; | |
2768 | case ALGORITHM_PARITY_N: | |
2769 | pd_idx = data_disks; | |
2770 | break; | |
1da177e4 | 2771 | default: |
99c0fb5f | 2772 | BUG(); |
16a53ecc N |
2773 | } |
2774 | break; | |
2775 | case 6: | |
2776 | ||
e183eaed | 2777 | switch (algorithm) { |
16a53ecc | 2778 | case ALGORITHM_LEFT_ASYMMETRIC: |
6e3b96ed | 2779 | pd_idx = raid_disks - 1 - sector_div(stripe2, raid_disks); |
911d4ee8 N |
2780 | qd_idx = pd_idx + 1; |
2781 | if (pd_idx == raid_disks-1) { | |
99c0fb5f | 2782 | (*dd_idx)++; /* Q D D D P */ |
911d4ee8 N |
2783 | qd_idx = 0; |
2784 | } else if (*dd_idx >= pd_idx) | |
16a53ecc N |
2785 | (*dd_idx) += 2; /* D D P Q D */ |
2786 | break; | |
2787 | case ALGORITHM_RIGHT_ASYMMETRIC: | |
6e3b96ed | 2788 | pd_idx = sector_div(stripe2, raid_disks); |
911d4ee8 N |
2789 | qd_idx = pd_idx + 1; |
2790 | if (pd_idx == raid_disks-1) { | |
99c0fb5f | 2791 | (*dd_idx)++; /* Q D D D P */ |
911d4ee8 N |
2792 | qd_idx = 0; |
2793 | } else if (*dd_idx >= pd_idx) | |
16a53ecc N |
2794 | (*dd_idx) += 2; /* D D P Q D */ |
2795 | break; | |
2796 | case ALGORITHM_LEFT_SYMMETRIC: | |
6e3b96ed | 2797 | pd_idx = raid_disks - 1 - sector_div(stripe2, raid_disks); |
911d4ee8 N |
2798 | qd_idx = (pd_idx + 1) % raid_disks; |
2799 | *dd_idx = (pd_idx + 2 + *dd_idx) % raid_disks; | |
16a53ecc N |
2800 | break; |
2801 | case ALGORITHM_RIGHT_SYMMETRIC: | |
6e3b96ed | 2802 | pd_idx = sector_div(stripe2, raid_disks); |
911d4ee8 N |
2803 | qd_idx = (pd_idx + 1) % raid_disks; |
2804 | *dd_idx = (pd_idx + 2 + *dd_idx) % raid_disks; | |
16a53ecc | 2805 | break; |
99c0fb5f N |
2806 | |
2807 | case ALGORITHM_PARITY_0: | |
2808 | pd_idx = 0; | |
2809 | qd_idx = 1; | |
2810 | (*dd_idx) += 2; | |
2811 | break; | |
2812 | case ALGORITHM_PARITY_N: | |
2813 | pd_idx = data_disks; | |
2814 | qd_idx = data_disks + 1; | |
2815 | break; | |
2816 | ||
2817 | case ALGORITHM_ROTATING_ZERO_RESTART: | |
2818 | /* Exactly the same as RIGHT_ASYMMETRIC, but or | |
2819 | * of blocks for computing Q is different. | |
2820 | */ | |
6e3b96ed | 2821 | pd_idx = sector_div(stripe2, raid_disks); |
99c0fb5f N |
2822 | qd_idx = pd_idx + 1; |
2823 | if (pd_idx == raid_disks-1) { | |
2824 | (*dd_idx)++; /* Q D D D P */ | |
2825 | qd_idx = 0; | |
2826 | } else if (*dd_idx >= pd_idx) | |
2827 | (*dd_idx) += 2; /* D D P Q D */ | |
67cc2b81 | 2828 | ddf_layout = 1; |
99c0fb5f N |
2829 | break; |
2830 | ||
2831 | case ALGORITHM_ROTATING_N_RESTART: | |
2832 | /* Same a left_asymmetric, by first stripe is | |
2833 | * D D D P Q rather than | |
2834 | * Q D D D P | |
2835 | */ | |
6e3b96ed N |
2836 | stripe2 += 1; |
2837 | pd_idx = raid_disks - 1 - sector_div(stripe2, raid_disks); | |
99c0fb5f N |
2838 | qd_idx = pd_idx + 1; |
2839 | if (pd_idx == raid_disks-1) { | |
2840 | (*dd_idx)++; /* Q D D D P */ | |
2841 | qd_idx = 0; | |
2842 | } else if (*dd_idx >= pd_idx) | |
2843 | (*dd_idx) += 2; /* D D P Q D */ | |
67cc2b81 | 2844 | ddf_layout = 1; |
99c0fb5f N |
2845 | break; |
2846 | ||
2847 | case ALGORITHM_ROTATING_N_CONTINUE: | |
2848 | /* Same as left_symmetric but Q is before P */ | |
6e3b96ed | 2849 | pd_idx = raid_disks - 1 - sector_div(stripe2, raid_disks); |
99c0fb5f N |
2850 | qd_idx = (pd_idx + raid_disks - 1) % raid_disks; |
2851 | *dd_idx = (pd_idx + 1 + *dd_idx) % raid_disks; | |
67cc2b81 | 2852 | ddf_layout = 1; |
99c0fb5f N |
2853 | break; |
2854 | ||
2855 | case ALGORITHM_LEFT_ASYMMETRIC_6: | |
2856 | /* RAID5 left_asymmetric, with Q on last device */ | |
6e3b96ed | 2857 | pd_idx = data_disks - sector_div(stripe2, raid_disks-1); |
99c0fb5f N |
2858 | if (*dd_idx >= pd_idx) |
2859 | (*dd_idx)++; | |
2860 | qd_idx = raid_disks - 1; | |
2861 | break; | |
2862 | ||
2863 | case ALGORITHM_RIGHT_ASYMMETRIC_6: | |
6e3b96ed | 2864 | pd_idx = sector_div(stripe2, raid_disks-1); |
99c0fb5f N |
2865 | if (*dd_idx >= pd_idx) |
2866 | (*dd_idx)++; | |
2867 | qd_idx = raid_disks - 1; | |
2868 | break; | |
2869 | ||
2870 | case ALGORITHM_LEFT_SYMMETRIC_6: | |
6e3b96ed | 2871 | pd_idx = data_disks - sector_div(stripe2, raid_disks-1); |
99c0fb5f N |
2872 | *dd_idx = (pd_idx + 1 + *dd_idx) % (raid_disks-1); |
2873 | qd_idx = raid_disks - 1; | |
2874 | break; | |
2875 | ||
2876 | case ALGORITHM_RIGHT_SYMMETRIC_6: | |
6e3b96ed | 2877 | pd_idx = sector_div(stripe2, raid_disks-1); |
99c0fb5f N |
2878 | *dd_idx = (pd_idx + 1 + *dd_idx) % (raid_disks-1); |
2879 | qd_idx = raid_disks - 1; | |
2880 | break; | |
2881 | ||
2882 | case ALGORITHM_PARITY_0_6: | |
2883 | pd_idx = 0; | |
2884 | (*dd_idx)++; | |
2885 | qd_idx = raid_disks - 1; | |
2886 | break; | |
2887 | ||
16a53ecc | 2888 | default: |
99c0fb5f | 2889 | BUG(); |
16a53ecc N |
2890 | } |
2891 | break; | |
1da177e4 LT |
2892 | } |
2893 | ||
911d4ee8 N |
2894 | if (sh) { |
2895 | sh->pd_idx = pd_idx; | |
2896 | sh->qd_idx = qd_idx; | |
67cc2b81 | 2897 | sh->ddf_layout = ddf_layout; |
911d4ee8 | 2898 | } |
1da177e4 LT |
2899 | /* |
2900 | * Finally, compute the new sector number | |
2901 | */ | |
2902 | new_sector = (sector_t)stripe * sectors_per_chunk + chunk_offset; | |
2903 | return new_sector; | |
2904 | } | |
2905 | ||
6d036f7d | 2906 | sector_t raid5_compute_blocknr(struct stripe_head *sh, int i, int previous) |
1da177e4 | 2907 | { |
d1688a6d | 2908 | struct r5conf *conf = sh->raid_conf; |
b875e531 N |
2909 | int raid_disks = sh->disks; |
2910 | int data_disks = raid_disks - conf->max_degraded; | |
1da177e4 | 2911 | sector_t new_sector = sh->sector, check; |
09c9e5fa AN |
2912 | int sectors_per_chunk = previous ? conf->prev_chunk_sectors |
2913 | : conf->chunk_sectors; | |
e183eaed N |
2914 | int algorithm = previous ? conf->prev_algo |
2915 | : conf->algorithm; | |
1da177e4 LT |
2916 | sector_t stripe; |
2917 | int chunk_offset; | |
35f2a591 N |
2918 | sector_t chunk_number; |
2919 | int dummy1, dd_idx = i; | |
1da177e4 | 2920 | sector_t r_sector; |
911d4ee8 | 2921 | struct stripe_head sh2; |
1da177e4 LT |
2922 | |
2923 | chunk_offset = sector_div(new_sector, sectors_per_chunk); | |
2924 | stripe = new_sector; | |
1da177e4 | 2925 | |
16a53ecc N |
2926 | if (i == sh->pd_idx) |
2927 | return 0; | |
2928 | switch(conf->level) { | |
2929 | case 4: break; | |
2930 | case 5: | |
e183eaed | 2931 | switch (algorithm) { |
1da177e4 LT |
2932 | case ALGORITHM_LEFT_ASYMMETRIC: |
2933 | case ALGORITHM_RIGHT_ASYMMETRIC: | |
2934 | if (i > sh->pd_idx) | |
2935 | i--; | |
2936 | break; | |
2937 | case ALGORITHM_LEFT_SYMMETRIC: | |
2938 | case ALGORITHM_RIGHT_SYMMETRIC: | |
2939 | if (i < sh->pd_idx) | |
2940 | i += raid_disks; | |
2941 | i -= (sh->pd_idx + 1); | |
2942 | break; | |
99c0fb5f N |
2943 | case ALGORITHM_PARITY_0: |
2944 | i -= 1; | |
2945 | break; | |
2946 | case ALGORITHM_PARITY_N: | |
2947 | break; | |
1da177e4 | 2948 | default: |
99c0fb5f | 2949 | BUG(); |
16a53ecc N |
2950 | } |
2951 | break; | |
2952 | case 6: | |
d0dabf7e | 2953 | if (i == sh->qd_idx) |
16a53ecc | 2954 | return 0; /* It is the Q disk */ |
e183eaed | 2955 | switch (algorithm) { |
16a53ecc N |
2956 | case ALGORITHM_LEFT_ASYMMETRIC: |
2957 | case ALGORITHM_RIGHT_ASYMMETRIC: | |
99c0fb5f N |
2958 | case ALGORITHM_ROTATING_ZERO_RESTART: |
2959 | case ALGORITHM_ROTATING_N_RESTART: | |
2960 | if (sh->pd_idx == raid_disks-1) | |
2961 | i--; /* Q D D D P */ | |
16a53ecc N |
2962 | else if (i > sh->pd_idx) |
2963 | i -= 2; /* D D P Q D */ | |
2964 | break; | |
2965 | case ALGORITHM_LEFT_SYMMETRIC: | |
2966 | case ALGORITHM_RIGHT_SYMMETRIC: | |
2967 | if (sh->pd_idx == raid_disks-1) | |
2968 | i--; /* Q D D D P */ | |
2969 | else { | |
2970 | /* D D P Q D */ | |
2971 | if (i < sh->pd_idx) | |
2972 | i += raid_disks; | |
2973 | i -= (sh->pd_idx + 2); | |
2974 | } | |
2975 | break; | |
99c0fb5f N |
2976 | case ALGORITHM_PARITY_0: |
2977 | i -= 2; | |
2978 | break; | |
2979 | case ALGORITHM_PARITY_N: | |
2980 | break; | |
2981 | case ALGORITHM_ROTATING_N_CONTINUE: | |
e4424fee | 2982 | /* Like left_symmetric, but P is before Q */ |
99c0fb5f N |
2983 | if (sh->pd_idx == 0) |
2984 | i--; /* P D D D Q */ | |
e4424fee N |
2985 | else { |
2986 | /* D D Q P D */ | |
2987 | if (i < sh->pd_idx) | |
2988 | i += raid_disks; | |
2989 | i -= (sh->pd_idx + 1); | |
2990 | } | |
99c0fb5f N |
2991 | break; |
2992 | case ALGORITHM_LEFT_ASYMMETRIC_6: | |
2993 | case ALGORITHM_RIGHT_ASYMMETRIC_6: | |
2994 | if (i > sh->pd_idx) | |
2995 | i--; | |
2996 | break; | |
2997 | case ALGORITHM_LEFT_SYMMETRIC_6: | |
2998 | case ALGORITHM_RIGHT_SYMMETRIC_6: | |
2999 | if (i < sh->pd_idx) | |
3000 | i += data_disks + 1; | |
3001 | i -= (sh->pd_idx + 1); | |
3002 | break; | |
3003 | case ALGORITHM_PARITY_0_6: | |
3004 | i -= 1; | |
3005 | break; | |
16a53ecc | 3006 | default: |
99c0fb5f | 3007 | BUG(); |
16a53ecc N |
3008 | } |
3009 | break; | |
1da177e4 LT |
3010 | } |
3011 | ||
3012 | chunk_number = stripe * data_disks + i; | |
35f2a591 | 3013 | r_sector = chunk_number * sectors_per_chunk + chunk_offset; |
1da177e4 | 3014 | |
112bf897 | 3015 | check = raid5_compute_sector(conf, r_sector, |
784052ec | 3016 | previous, &dummy1, &sh2); |
911d4ee8 N |
3017 | if (check != sh->sector || dummy1 != dd_idx || sh2.pd_idx != sh->pd_idx |
3018 | || sh2.qd_idx != sh->qd_idx) { | |
cc6167b4 N |
3019 | pr_warn("md/raid:%s: compute_blocknr: map not correct\n", |
3020 | mdname(conf->mddev)); | |
1da177e4 LT |
3021 | return 0; |
3022 | } | |
3023 | return r_sector; | |
3024 | } | |
3025 | ||
07e83364 SL |
3026 | /* |
3027 | * There are cases where we want handle_stripe_dirtying() and | |
3028 | * schedule_reconstruction() to delay towrite to some dev of a stripe. | |
3029 | * | |
3030 | * This function checks whether we want to delay the towrite. Specifically, | |
3031 | * we delay the towrite when: | |
3032 | * | |
3033 | * 1. degraded stripe has a non-overwrite to the missing dev, AND this | |
3034 | * stripe has data in journal (for other devices). | |
3035 | * | |
3036 | * In this case, when reading data for the non-overwrite dev, it is | |
3037 | * necessary to handle complex rmw of write back cache (prexor with | |
3038 | * orig_page, and xor with page). To keep read path simple, we would | |
3039 | * like to flush data in journal to RAID disks first, so complex rmw | |
3040 | * is handled in the write patch (handle_stripe_dirtying). | |
3041 | * | |
39b99586 SL |
3042 | * 2. when journal space is critical (R5C_LOG_CRITICAL=1) |
3043 | * | |
3044 | * It is important to be able to flush all stripes in raid5-cache. | |
3045 | * Therefore, we need reserve some space on the journal device for | |
3046 | * these flushes. If flush operation includes pending writes to the | |
3047 | * stripe, we need to reserve (conf->raid_disk + 1) pages per stripe | |
3048 | * for the flush out. If we exclude these pending writes from flush | |
3049 | * operation, we only need (conf->max_degraded + 1) pages per stripe. | |
3050 | * Therefore, excluding pending writes in these cases enables more | |
3051 | * efficient use of the journal device. | |
3052 | * | |
3053 | * Note: To make sure the stripe makes progress, we only delay | |
3054 | * towrite for stripes with data already in journal (injournal > 0). | |
3055 | * When LOG_CRITICAL, stripes with injournal == 0 will be sent to | |
3056 | * no_space_stripes list. | |
3057 | * | |
07e83364 | 3058 | */ |
39b99586 SL |
3059 | static inline bool delay_towrite(struct r5conf *conf, |
3060 | struct r5dev *dev, | |
3061 | struct stripe_head_state *s) | |
07e83364 | 3062 | { |
39b99586 SL |
3063 | /* case 1 above */ |
3064 | if (!test_bit(R5_OVERWRITE, &dev->flags) && | |
3065 | !test_bit(R5_Insync, &dev->flags) && s->injournal) | |
3066 | return true; | |
3067 | /* case 2 above */ | |
3068 | if (test_bit(R5C_LOG_CRITICAL, &conf->cache_state) && | |
3069 | s->injournal > 0) | |
3070 | return true; | |
3071 | return false; | |
07e83364 SL |
3072 | } |
3073 | ||
600aa109 | 3074 | static void |
c0f7bddb | 3075 | schedule_reconstruction(struct stripe_head *sh, struct stripe_head_state *s, |
600aa109 | 3076 | int rcw, int expand) |
e33129d8 | 3077 | { |
584acdd4 | 3078 | int i, pd_idx = sh->pd_idx, qd_idx = sh->qd_idx, disks = sh->disks; |
d1688a6d | 3079 | struct r5conf *conf = sh->raid_conf; |
c0f7bddb | 3080 | int level = conf->level; |
e33129d8 DW |
3081 | |
3082 | if (rcw) { | |
1e6d690b SL |
3083 | /* |
3084 | * In some cases, handle_stripe_dirtying initially decided to | |
3085 | * run rmw and allocates extra page for prexor. However, rcw is | |
3086 | * cheaper later on. We need to free the extra page now, | |
3087 | * because we won't be able to do that in ops_complete_prexor(). | |
3088 | */ | |
3089 | r5c_release_extra_page(sh); | |
e33129d8 DW |
3090 | |
3091 | for (i = disks; i--; ) { | |
3092 | struct r5dev *dev = &sh->dev[i]; | |
3093 | ||
39b99586 | 3094 | if (dev->towrite && !delay_towrite(conf, dev, s)) { |
e33129d8 | 3095 | set_bit(R5_LOCKED, &dev->flags); |
d8ee0728 | 3096 | set_bit(R5_Wantdrain, &dev->flags); |
e33129d8 DW |
3097 | if (!expand) |
3098 | clear_bit(R5_UPTODATE, &dev->flags); | |
600aa109 | 3099 | s->locked++; |
1e6d690b SL |
3100 | } else if (test_bit(R5_InJournal, &dev->flags)) { |
3101 | set_bit(R5_LOCKED, &dev->flags); | |
3102 | s->locked++; | |
e33129d8 DW |
3103 | } |
3104 | } | |
ce7d363a N |
3105 | /* if we are not expanding this is a proper write request, and |
3106 | * there will be bios with new data to be drained into the | |
3107 | * stripe cache | |
3108 | */ | |
3109 | if (!expand) { | |
3110 | if (!s->locked) | |
3111 | /* False alarm, nothing to do */ | |
3112 | return; | |
3113 | sh->reconstruct_state = reconstruct_state_drain_run; | |
3114 | set_bit(STRIPE_OP_BIODRAIN, &s->ops_request); | |
3115 | } else | |
3116 | sh->reconstruct_state = reconstruct_state_run; | |
3117 | ||
3118 | set_bit(STRIPE_OP_RECONSTRUCT, &s->ops_request); | |
3119 | ||
c0f7bddb | 3120 | if (s->locked + conf->max_degraded == disks) |
8b3e6cdc | 3121 | if (!test_and_set_bit(STRIPE_FULL_WRITE, &sh->state)) |
c0f7bddb | 3122 | atomic_inc(&conf->pending_full_writes); |
e33129d8 DW |
3123 | } else { |
3124 | BUG_ON(!(test_bit(R5_UPTODATE, &sh->dev[pd_idx].flags) || | |
3125 | test_bit(R5_Wantcompute, &sh->dev[pd_idx].flags))); | |
584acdd4 MS |
3126 | BUG_ON(level == 6 && |
3127 | (!(test_bit(R5_UPTODATE, &sh->dev[qd_idx].flags) || | |
3128 | test_bit(R5_Wantcompute, &sh->dev[qd_idx].flags)))); | |
e33129d8 | 3129 | |
e33129d8 DW |
3130 | for (i = disks; i--; ) { |
3131 | struct r5dev *dev = &sh->dev[i]; | |
584acdd4 | 3132 | if (i == pd_idx || i == qd_idx) |
e33129d8 DW |
3133 | continue; |
3134 | ||
e33129d8 DW |
3135 | if (dev->towrite && |
3136 | (test_bit(R5_UPTODATE, &dev->flags) || | |
d8ee0728 DW |
3137 | test_bit(R5_Wantcompute, &dev->flags))) { |
3138 | set_bit(R5_Wantdrain, &dev->flags); | |
e33129d8 DW |
3139 | set_bit(R5_LOCKED, &dev->flags); |
3140 | clear_bit(R5_UPTODATE, &dev->flags); | |
600aa109 | 3141 | s->locked++; |
1e6d690b SL |
3142 | } else if (test_bit(R5_InJournal, &dev->flags)) { |
3143 | set_bit(R5_LOCKED, &dev->flags); | |
3144 | s->locked++; | |
e33129d8 DW |
3145 | } |
3146 | } | |
ce7d363a N |
3147 | if (!s->locked) |
3148 | /* False alarm - nothing to do */ | |
3149 | return; | |
3150 | sh->reconstruct_state = reconstruct_state_prexor_drain_run; | |
3151 | set_bit(STRIPE_OP_PREXOR, &s->ops_request); | |
3152 | set_bit(STRIPE_OP_BIODRAIN, &s->ops_request); | |
3153 | set_bit(STRIPE_OP_RECONSTRUCT, &s->ops_request); | |
e33129d8 DW |
3154 | } |
3155 | ||
c0f7bddb | 3156 | /* keep the parity disk(s) locked while asynchronous operations |
e33129d8 DW |
3157 | * are in flight |
3158 | */ | |
3159 | set_bit(R5_LOCKED, &sh->dev[pd_idx].flags); | |
3160 | clear_bit(R5_UPTODATE, &sh->dev[pd_idx].flags); | |
600aa109 | 3161 | s->locked++; |
e33129d8 | 3162 | |
c0f7bddb YT |
3163 | if (level == 6) { |
3164 | int qd_idx = sh->qd_idx; | |
3165 | struct r5dev *dev = &sh->dev[qd_idx]; | |
3166 | ||
3167 | set_bit(R5_LOCKED, &dev->flags); | |
3168 | clear_bit(R5_UPTODATE, &dev->flags); | |
3169 | s->locked++; | |
3170 | } | |
3171 | ||
3418d036 AP |
3172 | if (raid5_has_ppl(sh->raid_conf) && |
3173 | test_bit(STRIPE_OP_BIODRAIN, &s->ops_request) && | |
3174 | !test_bit(STRIPE_FULL_WRITE, &sh->state) && | |
3175 | test_bit(R5_Insync, &sh->dev[pd_idx].flags)) | |
3176 | set_bit(STRIPE_OP_PARTIAL_PARITY, &s->ops_request); | |
3177 | ||
600aa109 | 3178 | pr_debug("%s: stripe %llu locked: %d ops_request: %lx\n", |
e46b272b | 3179 | __func__, (unsigned long long)sh->sector, |
600aa109 | 3180 | s->locked, s->ops_request); |
e33129d8 | 3181 | } |
16a53ecc | 3182 | |
1da177e4 LT |
3183 | /* |
3184 | * Each stripe/dev can have one or more bion attached. | |
16a53ecc | 3185 | * toread/towrite point to the first in a chain. |
1da177e4 LT |
3186 | * The bi_next chain must be in order. |
3187 | */ | |
da41ba65 | 3188 | static int add_stripe_bio(struct stripe_head *sh, struct bio *bi, int dd_idx, |
3189 | int forwrite, int previous) | |
1da177e4 LT |
3190 | { |
3191 | struct bio **bip; | |
d1688a6d | 3192 | struct r5conf *conf = sh->raid_conf; |
72626685 | 3193 | int firstwrite=0; |
1da177e4 | 3194 | |
cbe47ec5 | 3195 | pr_debug("adding bi b#%llu to stripe s#%llu\n", |
4f024f37 | 3196 | (unsigned long long)bi->bi_iter.bi_sector, |
1da177e4 LT |
3197 | (unsigned long long)sh->sector); |
3198 | ||
b17459c0 SL |
3199 | /* |
3200 | * If several bio share a stripe. The bio bi_phys_segments acts as a | |
3201 | * reference count to avoid race. The reference count should already be | |
3202 | * increased before this function is called (for example, in | |
849674e4 | 3203 | * raid5_make_request()), so other bio sharing this stripe will not free the |
b17459c0 SL |
3204 | * stripe. If a stripe is owned by one stripe, the stripe lock will |
3205 | * protect it. | |
3206 | */ | |
3207 | spin_lock_irq(&sh->stripe_lock); | |
59fc630b | 3208 | /* Don't allow new IO added to stripes in batch list */ |
3209 | if (sh->batch_head) | |
3210 | goto overlap; | |
72626685 | 3211 | if (forwrite) { |
1da177e4 | 3212 | bip = &sh->dev[dd_idx].towrite; |
7eaf7e8e | 3213 | if (*bip == NULL) |
72626685 N |
3214 | firstwrite = 1; |
3215 | } else | |
1da177e4 | 3216 | bip = &sh->dev[dd_idx].toread; |
4f024f37 KO |
3217 | while (*bip && (*bip)->bi_iter.bi_sector < bi->bi_iter.bi_sector) { |
3218 | if (bio_end_sector(*bip) > bi->bi_iter.bi_sector) | |
1da177e4 LT |
3219 | goto overlap; |
3220 | bip = & (*bip)->bi_next; | |
3221 | } | |
4f024f37 | 3222 | if (*bip && (*bip)->bi_iter.bi_sector < bio_end_sector(bi)) |
1da177e4 LT |
3223 | goto overlap; |
3224 | ||
3418d036 AP |
3225 | if (forwrite && raid5_has_ppl(conf)) { |
3226 | /* | |
3227 | * With PPL only writes to consecutive data chunks within a | |
3228 | * stripe are allowed because for a single stripe_head we can | |
3229 | * only have one PPL entry at a time, which describes one data | |
3230 | * range. Not really an overlap, but wait_for_overlap can be | |
3231 | * used to handle this. | |
3232 | */ | |
3233 | sector_t sector; | |
3234 | sector_t first = 0; | |
3235 | sector_t last = 0; | |
3236 | int count = 0; | |
3237 | int i; | |
3238 | ||
3239 | for (i = 0; i < sh->disks; i++) { | |
3240 | if (i != sh->pd_idx && | |
3241 | (i == dd_idx || sh->dev[i].towrite)) { | |
3242 | sector = sh->dev[i].sector; | |
3243 | if (count == 0 || sector < first) | |
3244 | first = sector; | |
3245 | if (sector > last) | |
3246 | last = sector; | |
3247 | count++; | |
3248 | } | |
3249 | } | |
3250 | ||
3251 | if (first + conf->chunk_sectors * (count - 1) != last) | |
3252 | goto overlap; | |
3253 | } | |
3254 | ||
da41ba65 | 3255 | if (!forwrite || previous) |
3256 | clear_bit(STRIPE_BATCH_READY, &sh->state); | |
3257 | ||
78bafebd | 3258 | BUG_ON(*bip && bi->bi_next && (*bip) != bi->bi_next); |
1da177e4 LT |
3259 | if (*bip) |
3260 | bi->bi_next = *bip; | |
3261 | *bip = bi; | |
e7836bd6 | 3262 | raid5_inc_bi_active_stripes(bi); |
49728050 | 3263 | md_write_inc(conf->mddev, bi); |
72626685 | 3264 | |
1da177e4 LT |
3265 | if (forwrite) { |
3266 | /* check if page is covered */ | |
3267 | sector_t sector = sh->dev[dd_idx].sector; | |
3268 | for (bi=sh->dev[dd_idx].towrite; | |
3269 | sector < sh->dev[dd_idx].sector + STRIPE_SECTORS && | |
4f024f37 | 3270 | bi && bi->bi_iter.bi_sector <= sector; |
1da177e4 | 3271 | bi = r5_next_bio(bi, sh->dev[dd_idx].sector)) { |
f73a1c7d KO |
3272 | if (bio_end_sector(bi) >= sector) |
3273 | sector = bio_end_sector(bi); | |
1da177e4 LT |
3274 | } |
3275 | if (sector >= sh->dev[dd_idx].sector + STRIPE_SECTORS) | |
7a87f434 | 3276 | if (!test_and_set_bit(R5_OVERWRITE, &sh->dev[dd_idx].flags)) |
3277 | sh->overwrite_disks++; | |
1da177e4 | 3278 | } |
cbe47ec5 N |
3279 | |
3280 | pr_debug("added bi b#%llu to stripe s#%llu, disk %d.\n", | |
4f024f37 | 3281 | (unsigned long long)(*bip)->bi_iter.bi_sector, |
cbe47ec5 N |
3282 | (unsigned long long)sh->sector, dd_idx); |
3283 | ||
3284 | if (conf->mddev->bitmap && firstwrite) { | |
d0852df5 N |
3285 | /* Cannot hold spinlock over bitmap_startwrite, |
3286 | * but must ensure this isn't added to a batch until | |
3287 | * we have added to the bitmap and set bm_seq. | |
3288 | * So set STRIPE_BITMAP_PENDING to prevent | |
3289 | * batching. | |
3290 | * If multiple add_stripe_bio() calls race here they | |
3291 | * much all set STRIPE_BITMAP_PENDING. So only the first one | |
3292 | * to complete "bitmap_startwrite" gets to set | |
3293 | * STRIPE_BIT_DELAY. This is important as once a stripe | |
3294 | * is added to a batch, STRIPE_BIT_DELAY cannot be changed | |
3295 | * any more. | |
3296 | */ | |
3297 | set_bit(STRIPE_BITMAP_PENDING, &sh->state); | |
3298 | spin_unlock_irq(&sh->stripe_lock); | |
cbe47ec5 N |
3299 | bitmap_startwrite(conf->mddev->bitmap, sh->sector, |
3300 | STRIPE_SECTORS, 0); | |
d0852df5 N |
3301 | spin_lock_irq(&sh->stripe_lock); |
3302 | clear_bit(STRIPE_BITMAP_PENDING, &sh->state); | |
3303 | if (!sh->batch_head) { | |
3304 | sh->bm_seq = conf->seq_flush+1; | |
3305 | set_bit(STRIPE_BIT_DELAY, &sh->state); | |
3306 | } | |
cbe47ec5 | 3307 | } |
d0852df5 | 3308 | spin_unlock_irq(&sh->stripe_lock); |
59fc630b | 3309 | |
3310 | if (stripe_can_batch(sh)) | |
3311 | stripe_add_to_batch_list(conf, sh); | |
1da177e4 LT |
3312 | return 1; |
3313 | ||
3314 | overlap: | |
3315 | set_bit(R5_Overlap, &sh->dev[dd_idx].flags); | |
b17459c0 | 3316 | spin_unlock_irq(&sh->stripe_lock); |
1da177e4 LT |
3317 | return 0; |
3318 | } | |
3319 | ||
d1688a6d | 3320 | static void end_reshape(struct r5conf *conf); |
29269553 | 3321 | |
d1688a6d | 3322 | static void stripe_set_idx(sector_t stripe, struct r5conf *conf, int previous, |
911d4ee8 | 3323 | struct stripe_head *sh) |
ccfcc3c1 | 3324 | { |
784052ec | 3325 | int sectors_per_chunk = |
09c9e5fa | 3326 | previous ? conf->prev_chunk_sectors : conf->chunk_sectors; |
911d4ee8 | 3327 | int dd_idx; |
2d2063ce | 3328 | int chunk_offset = sector_div(stripe, sectors_per_chunk); |
112bf897 | 3329 | int disks = previous ? conf->previous_raid_disks : conf->raid_disks; |
2d2063ce | 3330 | |
112bf897 N |
3331 | raid5_compute_sector(conf, |
3332 | stripe * (disks - conf->max_degraded) | |
b875e531 | 3333 | *sectors_per_chunk + chunk_offset, |
112bf897 | 3334 | previous, |
911d4ee8 | 3335 | &dd_idx, sh); |
ccfcc3c1 N |
3336 | } |
3337 | ||
a4456856 | 3338 | static void |
d1688a6d | 3339 | handle_failed_stripe(struct r5conf *conf, struct stripe_head *sh, |
bd83d0a2 | 3340 | struct stripe_head_state *s, int disks) |
a4456856 DW |
3341 | { |
3342 | int i; | |
59fc630b | 3343 | BUG_ON(sh->batch_head); |
a4456856 DW |
3344 | for (i = disks; i--; ) { |
3345 | struct bio *bi; | |
3346 | int bitmap_end = 0; | |
3347 | ||
3348 | if (test_bit(R5_ReadError, &sh->dev[i].flags)) { | |
3cb03002 | 3349 | struct md_rdev *rdev; |
a4456856 DW |
3350 | rcu_read_lock(); |
3351 | rdev = rcu_dereference(conf->disks[i].rdev); | |
f5b67ae8 N |
3352 | if (rdev && test_bit(In_sync, &rdev->flags) && |
3353 | !test_bit(Faulty, &rdev->flags)) | |
7f0da59b N |
3354 | atomic_inc(&rdev->nr_pending); |
3355 | else | |
3356 | rdev = NULL; | |
a4456856 | 3357 | rcu_read_unlock(); |
7f0da59b N |
3358 | if (rdev) { |
3359 | if (!rdev_set_badblocks( | |
3360 | rdev, | |
3361 | sh->sector, | |
3362 | STRIPE_SECTORS, 0)) | |
3363 | md_error(conf->mddev, rdev); | |
3364 | rdev_dec_pending(rdev, conf->mddev); | |
3365 | } | |
a4456856 | 3366 | } |
b17459c0 | 3367 | spin_lock_irq(&sh->stripe_lock); |
a4456856 DW |
3368 | /* fail all writes first */ |
3369 | bi = sh->dev[i].towrite; | |
3370 | sh->dev[i].towrite = NULL; | |
7a87f434 | 3371 | sh->overwrite_disks = 0; |
b17459c0 | 3372 | spin_unlock_irq(&sh->stripe_lock); |
1ed850f3 | 3373 | if (bi) |
a4456856 | 3374 | bitmap_end = 1; |
a4456856 | 3375 | |
ff875738 | 3376 | log_stripe_write_finished(sh); |
0576b1c6 | 3377 | |
a4456856 DW |
3378 | if (test_and_clear_bit(R5_Overlap, &sh->dev[i].flags)) |
3379 | wake_up(&conf->wait_for_overlap); | |
3380 | ||
4f024f37 | 3381 | while (bi && bi->bi_iter.bi_sector < |
a4456856 DW |
3382 | sh->dev[i].sector + STRIPE_SECTORS) { |
3383 | struct bio *nextbi = r5_next_bio(bi, sh->dev[i].sector); | |
4246a0b6 CH |
3384 | |
3385 | bi->bi_error = -EIO; | |
49728050 N |
3386 | md_write_end(conf->mddev); |
3387 | if (!raid5_dec_bi_active_stripes(bi)) | |
bd83d0a2 | 3388 | bio_endio(bi); |
a4456856 DW |
3389 | bi = nextbi; |
3390 | } | |
7eaf7e8e SL |
3391 | if (bitmap_end) |
3392 | bitmap_endwrite(conf->mddev->bitmap, sh->sector, | |
3393 | STRIPE_SECTORS, 0, 0); | |
3394 | bitmap_end = 0; | |
a4456856 DW |
3395 | /* and fail all 'written' */ |
3396 | bi = sh->dev[i].written; | |
3397 | sh->dev[i].written = NULL; | |
d592a996 SL |
3398 | if (test_and_clear_bit(R5_SkipCopy, &sh->dev[i].flags)) { |
3399 | WARN_ON(test_bit(R5_UPTODATE, &sh->dev[i].flags)); | |
3400 | sh->dev[i].page = sh->dev[i].orig_page; | |
3401 | } | |
3402 | ||
a4456856 | 3403 | if (bi) bitmap_end = 1; |
4f024f37 | 3404 | while (bi && bi->bi_iter.bi_sector < |
a4456856 DW |
3405 | sh->dev[i].sector + STRIPE_SECTORS) { |
3406 | struct bio *bi2 = r5_next_bio(bi, sh->dev[i].sector); | |
4246a0b6 CH |
3407 | |
3408 | bi->bi_error = -EIO; | |
49728050 N |
3409 | md_write_end(conf->mddev); |
3410 | if (!raid5_dec_bi_active_stripes(bi)) | |
bd83d0a2 | 3411 | bio_endio(bi); |
a4456856 DW |
3412 | bi = bi2; |
3413 | } | |
3414 | ||
b5e98d65 DW |
3415 | /* fail any reads if this device is non-operational and |
3416 | * the data has not reached the cache yet. | |
3417 | */ | |
3418 | if (!test_bit(R5_Wantfill, &sh->dev[i].flags) && | |
6e74a9cf | 3419 | s->failed > conf->max_degraded && |
b5e98d65 DW |
3420 | (!test_bit(R5_Insync, &sh->dev[i].flags) || |
3421 | test_bit(R5_ReadError, &sh->dev[i].flags))) { | |
143c4d05 | 3422 | spin_lock_irq(&sh->stripe_lock); |
a4456856 DW |
3423 | bi = sh->dev[i].toread; |
3424 | sh->dev[i].toread = NULL; | |
143c4d05 | 3425 | spin_unlock_irq(&sh->stripe_lock); |
a4456856 DW |
3426 | if (test_and_clear_bit(R5_Overlap, &sh->dev[i].flags)) |
3427 | wake_up(&conf->wait_for_overlap); | |
ebda780b SL |
3428 | if (bi) |
3429 | s->to_read--; | |
4f024f37 | 3430 | while (bi && bi->bi_iter.bi_sector < |
a4456856 DW |
3431 | sh->dev[i].sector + STRIPE_SECTORS) { |
3432 | struct bio *nextbi = | |
3433 | r5_next_bio(bi, sh->dev[i].sector); | |
4246a0b6 CH |
3434 | |
3435 | bi->bi_error = -EIO; | |
34a6f80e | 3436 | if (!raid5_dec_bi_active_stripes(bi)) |
bd83d0a2 | 3437 | bio_endio(bi); |
a4456856 DW |
3438 | bi = nextbi; |
3439 | } | |
3440 | } | |
a4456856 DW |
3441 | if (bitmap_end) |
3442 | bitmap_endwrite(conf->mddev->bitmap, sh->sector, | |
3443 | STRIPE_SECTORS, 0, 0); | |
8cfa7b0f N |
3444 | /* If we were in the middle of a write the parity block might |
3445 | * still be locked - so just clear all R5_LOCKED flags | |
3446 | */ | |
3447 | clear_bit(R5_LOCKED, &sh->dev[i].flags); | |
a4456856 | 3448 | } |
ebda780b SL |
3449 | s->to_write = 0; |
3450 | s->written = 0; | |
a4456856 | 3451 | |
8b3e6cdc DW |
3452 | if (test_and_clear_bit(STRIPE_FULL_WRITE, &sh->state)) |
3453 | if (atomic_dec_and_test(&conf->pending_full_writes)) | |
3454 | md_wakeup_thread(conf->mddev->thread); | |
a4456856 DW |
3455 | } |
3456 | ||
7f0da59b | 3457 | static void |
d1688a6d | 3458 | handle_failed_sync(struct r5conf *conf, struct stripe_head *sh, |
7f0da59b N |
3459 | struct stripe_head_state *s) |
3460 | { | |
3461 | int abort = 0; | |
3462 | int i; | |
3463 | ||
59fc630b | 3464 | BUG_ON(sh->batch_head); |
7f0da59b | 3465 | clear_bit(STRIPE_SYNCING, &sh->state); |
f8dfcffd N |
3466 | if (test_and_clear_bit(R5_Overlap, &sh->dev[sh->pd_idx].flags)) |
3467 | wake_up(&conf->wait_for_overlap); | |
7f0da59b | 3468 | s->syncing = 0; |
9a3e1101 | 3469 | s->replacing = 0; |
7f0da59b | 3470 | /* There is nothing more to do for sync/check/repair. |
18b9837e N |
3471 | * Don't even need to abort as that is handled elsewhere |
3472 | * if needed, and not always wanted e.g. if there is a known | |
3473 | * bad block here. | |
9a3e1101 | 3474 | * For recover/replace we need to record a bad block on all |
7f0da59b N |
3475 | * non-sync devices, or abort the recovery |
3476 | */ | |
18b9837e N |
3477 | if (test_bit(MD_RECOVERY_RECOVER, &conf->mddev->recovery)) { |
3478 | /* During recovery devices cannot be removed, so | |
3479 | * locking and refcounting of rdevs is not needed | |
3480 | */ | |
e50d3992 | 3481 | rcu_read_lock(); |
18b9837e | 3482 | for (i = 0; i < conf->raid_disks; i++) { |
e50d3992 | 3483 | struct md_rdev *rdev = rcu_dereference(conf->disks[i].rdev); |
18b9837e N |
3484 | if (rdev |
3485 | && !test_bit(Faulty, &rdev->flags) | |
3486 | && !test_bit(In_sync, &rdev->flags) | |
3487 | && !rdev_set_badblocks(rdev, sh->sector, | |
3488 | STRIPE_SECTORS, 0)) | |
3489 | abort = 1; | |
e50d3992 | 3490 | rdev = rcu_dereference(conf->disks[i].replacement); |
18b9837e N |
3491 | if (rdev |
3492 | && !test_bit(Faulty, &rdev->flags) | |
3493 | && !test_bit(In_sync, &rdev->flags) | |
3494 | && !rdev_set_badblocks(rdev, sh->sector, | |
3495 | STRIPE_SECTORS, 0)) | |
3496 | abort = 1; | |
3497 | } | |
e50d3992 | 3498 | rcu_read_unlock(); |
18b9837e N |
3499 | if (abort) |
3500 | conf->recovery_disabled = | |
3501 | conf->mddev->recovery_disabled; | |
7f0da59b | 3502 | } |
18b9837e | 3503 | md_done_sync(conf->mddev, STRIPE_SECTORS, !abort); |
7f0da59b N |
3504 | } |
3505 | ||
9a3e1101 N |
3506 | static int want_replace(struct stripe_head *sh, int disk_idx) |
3507 | { | |
3508 | struct md_rdev *rdev; | |
3509 | int rv = 0; | |
3f232d6a N |
3510 | |
3511 | rcu_read_lock(); | |
3512 | rdev = rcu_dereference(sh->raid_conf->disks[disk_idx].replacement); | |
9a3e1101 N |
3513 | if (rdev |
3514 | && !test_bit(Faulty, &rdev->flags) | |
3515 | && !test_bit(In_sync, &rdev->flags) | |
3516 | && (rdev->recovery_offset <= sh->sector | |
3517 | || rdev->mddev->recovery_cp <= sh->sector)) | |
3518 | rv = 1; | |
3f232d6a | 3519 | rcu_read_unlock(); |
9a3e1101 N |
3520 | return rv; |
3521 | } | |
3522 | ||
2c58f06e N |
3523 | static int need_this_block(struct stripe_head *sh, struct stripe_head_state *s, |
3524 | int disk_idx, int disks) | |
a4456856 | 3525 | { |
5599becc | 3526 | struct r5dev *dev = &sh->dev[disk_idx]; |
f2b3b44d N |
3527 | struct r5dev *fdev[2] = { &sh->dev[s->failed_num[0]], |
3528 | &sh->dev[s->failed_num[1]] }; | |
ea664c82 | 3529 | int i; |
5599becc | 3530 | |
a79cfe12 N |
3531 | |
3532 | if (test_bit(R5_LOCKED, &dev->flags) || | |
3533 | test_bit(R5_UPTODATE, &dev->flags)) | |
3534 | /* No point reading this as we already have it or have | |
3535 | * decided to get it. | |
3536 | */ | |
3537 | return 0; | |
3538 | ||
3539 | if (dev->toread || | |
3540 | (dev->towrite && !test_bit(R5_OVERWRITE, &dev->flags))) | |
3541 | /* We need this block to directly satisfy a request */ | |
3542 | return 1; | |
3543 | ||
3544 | if (s->syncing || s->expanding || | |
3545 | (s->replacing && want_replace(sh, disk_idx))) | |
3546 | /* When syncing, or expanding we read everything. | |
3547 | * When replacing, we need the replaced block. | |
3548 | */ | |
3549 | return 1; | |
3550 | ||
3551 | if ((s->failed >= 1 && fdev[0]->toread) || | |
3552 | (s->failed >= 2 && fdev[1]->toread)) | |
3553 | /* If we want to read from a failed device, then | |
3554 | * we need to actually read every other device. | |
3555 | */ | |
3556 | return 1; | |
3557 | ||
a9d56950 N |
3558 | /* Sometimes neither read-modify-write nor reconstruct-write |
3559 | * cycles can work. In those cases we read every block we | |
3560 | * can. Then the parity-update is certain to have enough to | |
3561 | * work with. | |
3562 | * This can only be a problem when we need to write something, | |
3563 | * and some device has failed. If either of those tests | |
3564 | * fail we need look no further. | |
3565 | */ | |
3566 | if (!s->failed || !s->to_write) | |
3567 | return 0; | |
3568 | ||
3569 | if (test_bit(R5_Insync, &dev->flags) && | |
3570 | !test_bit(STRIPE_PREREAD_ACTIVE, &sh->state)) | |
3571 | /* Pre-reads at not permitted until after short delay | |
3572 | * to gather multiple requests. However if this | |
3573 | * device is no Insync, the block could only be be computed | |
3574 | * and there is no need to delay that. | |
3575 | */ | |
3576 | return 0; | |
ea664c82 | 3577 | |
36707bb2 | 3578 | for (i = 0; i < s->failed && i < 2; i++) { |
ea664c82 N |
3579 | if (fdev[i]->towrite && |
3580 | !test_bit(R5_UPTODATE, &fdev[i]->flags) && | |
3581 | !test_bit(R5_OVERWRITE, &fdev[i]->flags)) | |
3582 | /* If we have a partial write to a failed | |
3583 | * device, then we will need to reconstruct | |
3584 | * the content of that device, so all other | |
3585 | * devices must be read. | |
3586 | */ | |
3587 | return 1; | |
3588 | } | |
3589 | ||
3590 | /* If we are forced to do a reconstruct-write, either because | |
3591 | * the current RAID6 implementation only supports that, or | |
3592 | * or because parity cannot be trusted and we are currently | |
3593 | * recovering it, there is extra need to be careful. | |
3594 | * If one of the devices that we would need to read, because | |
3595 | * it is not being overwritten (and maybe not written at all) | |
3596 | * is missing/faulty, then we need to read everything we can. | |
3597 | */ | |
3598 | if (sh->raid_conf->level != 6 && | |
3599 | sh->sector < sh->raid_conf->mddev->recovery_cp) | |
3600 | /* reconstruct-write isn't being forced */ | |
3601 | return 0; | |
36707bb2 | 3602 | for (i = 0; i < s->failed && i < 2; i++) { |
10d82c5f N |
3603 | if (s->failed_num[i] != sh->pd_idx && |
3604 | s->failed_num[i] != sh->qd_idx && | |
3605 | !test_bit(R5_UPTODATE, &fdev[i]->flags) && | |
ea664c82 N |
3606 | !test_bit(R5_OVERWRITE, &fdev[i]->flags)) |
3607 | return 1; | |
3608 | } | |
3609 | ||
2c58f06e N |
3610 | return 0; |
3611 | } | |
3612 | ||
ba02684d SL |
3613 | /* fetch_block - checks the given member device to see if its data needs |
3614 | * to be read or computed to satisfy a request. | |
3615 | * | |
3616 | * Returns 1 when no more member devices need to be checked, otherwise returns | |
3617 | * 0 to tell the loop in handle_stripe_fill to continue | |
3618 | */ | |
2c58f06e N |
3619 | static int fetch_block(struct stripe_head *sh, struct stripe_head_state *s, |
3620 | int disk_idx, int disks) | |
3621 | { | |
3622 | struct r5dev *dev = &sh->dev[disk_idx]; | |
3623 | ||
3624 | /* is the data in this block needed, and can we get it? */ | |
3625 | if (need_this_block(sh, s, disk_idx, disks)) { | |
5599becc YT |
3626 | /* we would like to get this block, possibly by computing it, |
3627 | * otherwise read it if the backing disk is insync | |
3628 | */ | |
3629 | BUG_ON(test_bit(R5_Wantcompute, &dev->flags)); | |
3630 | BUG_ON(test_bit(R5_Wantread, &dev->flags)); | |
b0c783b3 | 3631 | BUG_ON(sh->batch_head); |
5599becc | 3632 | if ((s->uptodate == disks - 1) && |
f2b3b44d N |
3633 | (s->failed && (disk_idx == s->failed_num[0] || |
3634 | disk_idx == s->failed_num[1]))) { | |
5599becc YT |
3635 | /* have disk failed, and we're requested to fetch it; |
3636 | * do compute it | |
a4456856 | 3637 | */ |
5599becc YT |
3638 | pr_debug("Computing stripe %llu block %d\n", |
3639 | (unsigned long long)sh->sector, disk_idx); | |
3640 | set_bit(STRIPE_COMPUTE_RUN, &sh->state); | |
3641 | set_bit(STRIPE_OP_COMPUTE_BLK, &s->ops_request); | |
3642 | set_bit(R5_Wantcompute, &dev->flags); | |
3643 | sh->ops.target = disk_idx; | |
3644 | sh->ops.target2 = -1; /* no 2nd target */ | |
3645 | s->req_compute = 1; | |
93b3dbce N |
3646 | /* Careful: from this point on 'uptodate' is in the eye |
3647 | * of raid_run_ops which services 'compute' operations | |
3648 | * before writes. R5_Wantcompute flags a block that will | |
3649 | * be R5_UPTODATE by the time it is needed for a | |
3650 | * subsequent operation. | |
3651 | */ | |
5599becc YT |
3652 | s->uptodate++; |
3653 | return 1; | |
3654 | } else if (s->uptodate == disks-2 && s->failed >= 2) { | |
3655 | /* Computing 2-failure is *very* expensive; only | |
3656 | * do it if failed >= 2 | |
3657 | */ | |
3658 | int other; | |
3659 | for (other = disks; other--; ) { | |
3660 | if (other == disk_idx) | |
3661 | continue; | |
3662 | if (!test_bit(R5_UPTODATE, | |
3663 | &sh->dev[other].flags)) | |
3664 | break; | |
a4456856 | 3665 | } |
5599becc YT |
3666 | BUG_ON(other < 0); |
3667 | pr_debug("Computing stripe %llu blocks %d,%d\n", | |
3668 | (unsigned long long)sh->sector, | |
3669 | disk_idx, other); | |
3670 | set_bit(STRIPE_COMPUTE_RUN, &sh->state); | |
3671 | set_bit(STRIPE_OP_COMPUTE_BLK, &s->ops_request); | |
3672 | set_bit(R5_Wantcompute, &sh->dev[disk_idx].flags); | |
3673 | set_bit(R5_Wantcompute, &sh->dev[other].flags); | |
3674 | sh->ops.target = disk_idx; | |
3675 | sh->ops.target2 = other; | |
3676 | s->uptodate += 2; | |
3677 | s->req_compute = 1; | |
3678 | return 1; | |
3679 | } else if (test_bit(R5_Insync, &dev->flags)) { | |
3680 | set_bit(R5_LOCKED, &dev->flags); | |
3681 | set_bit(R5_Wantread, &dev->flags); | |
3682 | s->locked++; | |
3683 | pr_debug("Reading block %d (sync=%d)\n", | |
3684 | disk_idx, s->syncing); | |
a4456856 DW |
3685 | } |
3686 | } | |
5599becc YT |
3687 | |
3688 | return 0; | |
3689 | } | |
3690 | ||
3691 | /** | |
93b3dbce | 3692 | * handle_stripe_fill - read or compute data to satisfy pending requests. |
5599becc | 3693 | */ |
93b3dbce N |
3694 | static void handle_stripe_fill(struct stripe_head *sh, |
3695 | struct stripe_head_state *s, | |
3696 | int disks) | |
5599becc YT |
3697 | { |
3698 | int i; | |
3699 | ||
3700 | /* look for blocks to read/compute, skip this if a compute | |
3701 | * is already in flight, or if the stripe contents are in the | |
3702 | * midst of changing due to a write | |
3703 | */ | |
3704 | if (!test_bit(STRIPE_COMPUTE_RUN, &sh->state) && !sh->check_state && | |
07e83364 SL |
3705 | !sh->reconstruct_state) { |
3706 | ||
3707 | /* | |
3708 | * For degraded stripe with data in journal, do not handle | |
3709 | * read requests yet, instead, flush the stripe to raid | |
3710 | * disks first, this avoids handling complex rmw of write | |
3711 | * back cache (prexor with orig_page, and then xor with | |
3712 | * page) in the read path | |
3713 | */ | |
3714 | if (s->injournal && s->failed) { | |
3715 | if (test_bit(STRIPE_R5C_CACHING, &sh->state)) | |
3716 | r5c_make_stripe_write_out(sh); | |
3717 | goto out; | |
3718 | } | |
3719 | ||
5599becc | 3720 | for (i = disks; i--; ) |
93b3dbce | 3721 | if (fetch_block(sh, s, i, disks)) |
5599becc | 3722 | break; |
07e83364 SL |
3723 | } |
3724 | out: | |
a4456856 DW |
3725 | set_bit(STRIPE_HANDLE, &sh->state); |
3726 | } | |
3727 | ||
787b76fa N |
3728 | static void break_stripe_batch_list(struct stripe_head *head_sh, |
3729 | unsigned long handle_flags); | |
1fe797e6 | 3730 | /* handle_stripe_clean_event |
a4456856 DW |
3731 | * any written block on an uptodate or failed drive can be returned. |
3732 | * Note that if we 'wrote' to a failed drive, it will be UPTODATE, but | |
3733 | * never LOCKED, so we don't need to test 'failed' directly. | |
3734 | */ | |
d1688a6d | 3735 | static void handle_stripe_clean_event(struct r5conf *conf, |
bd83d0a2 | 3736 | struct stripe_head *sh, int disks) |
a4456856 DW |
3737 | { |
3738 | int i; | |
3739 | struct r5dev *dev; | |
f8dfcffd | 3740 | int discard_pending = 0; |
59fc630b | 3741 | struct stripe_head *head_sh = sh; |
3742 | bool do_endio = false; | |
a4456856 DW |
3743 | |
3744 | for (i = disks; i--; ) | |
3745 | if (sh->dev[i].written) { | |
3746 | dev = &sh->dev[i]; | |
3747 | if (!test_bit(R5_LOCKED, &dev->flags) && | |
9e444768 | 3748 | (test_bit(R5_UPTODATE, &dev->flags) || |
d592a996 SL |
3749 | test_bit(R5_Discard, &dev->flags) || |
3750 | test_bit(R5_SkipCopy, &dev->flags))) { | |
a4456856 DW |
3751 | /* We can return any write requests */ |
3752 | struct bio *wbi, *wbi2; | |
45b4233c | 3753 | pr_debug("Return write for disc %d\n", i); |
ca64cae9 N |
3754 | if (test_and_clear_bit(R5_Discard, &dev->flags)) |
3755 | clear_bit(R5_UPTODATE, &dev->flags); | |
d592a996 SL |
3756 | if (test_and_clear_bit(R5_SkipCopy, &dev->flags)) { |
3757 | WARN_ON(test_bit(R5_UPTODATE, &dev->flags)); | |
d592a996 | 3758 | } |
59fc630b | 3759 | do_endio = true; |
3760 | ||
3761 | returnbi: | |
3762 | dev->page = dev->orig_page; | |
a4456856 DW |
3763 | wbi = dev->written; |
3764 | dev->written = NULL; | |
4f024f37 | 3765 | while (wbi && wbi->bi_iter.bi_sector < |
a4456856 DW |
3766 | dev->sector + STRIPE_SECTORS) { |
3767 | wbi2 = r5_next_bio(wbi, dev->sector); | |
49728050 N |
3768 | md_write_end(conf->mddev); |
3769 | if (!raid5_dec_bi_active_stripes(wbi)) | |
bd83d0a2 | 3770 | bio_endio(wbi); |
a4456856 DW |
3771 | wbi = wbi2; |
3772 | } | |
7eaf7e8e SL |
3773 | bitmap_endwrite(conf->mddev->bitmap, sh->sector, |
3774 | STRIPE_SECTORS, | |
a4456856 | 3775 | !test_bit(STRIPE_DEGRADED, &sh->state), |
7eaf7e8e | 3776 | 0); |
59fc630b | 3777 | if (head_sh->batch_head) { |
3778 | sh = list_first_entry(&sh->batch_list, | |
3779 | struct stripe_head, | |
3780 | batch_list); | |
3781 | if (sh != head_sh) { | |
3782 | dev = &sh->dev[i]; | |
3783 | goto returnbi; | |
3784 | } | |
3785 | } | |
3786 | sh = head_sh; | |
3787 | dev = &sh->dev[i]; | |
f8dfcffd N |
3788 | } else if (test_bit(R5_Discard, &dev->flags)) |
3789 | discard_pending = 1; | |
3790 | } | |
f6bed0ef | 3791 | |
ff875738 | 3792 | log_stripe_write_finished(sh); |
0576b1c6 | 3793 | |
f8dfcffd N |
3794 | if (!discard_pending && |
3795 | test_bit(R5_Discard, &sh->dev[sh->pd_idx].flags)) { | |
b8a9d66d | 3796 | int hash; |
f8dfcffd N |
3797 | clear_bit(R5_Discard, &sh->dev[sh->pd_idx].flags); |
3798 | clear_bit(R5_UPTODATE, &sh->dev[sh->pd_idx].flags); | |
3799 | if (sh->qd_idx >= 0) { | |
3800 | clear_bit(R5_Discard, &sh->dev[sh->qd_idx].flags); | |
3801 | clear_bit(R5_UPTODATE, &sh->dev[sh->qd_idx].flags); | |
3802 | } | |
3803 | /* now that discard is done we can proceed with any sync */ | |
3804 | clear_bit(STRIPE_DISCARD, &sh->state); | |
d47648fc SL |
3805 | /* |
3806 | * SCSI discard will change some bio fields and the stripe has | |
3807 | * no updated data, so remove it from hash list and the stripe | |
3808 | * will be reinitialized | |
3809 | */ | |
59fc630b | 3810 | unhash: |
b8a9d66d RG |
3811 | hash = sh->hash_lock_index; |
3812 | spin_lock_irq(conf->hash_locks + hash); | |
d47648fc | 3813 | remove_hash(sh); |
b8a9d66d | 3814 | spin_unlock_irq(conf->hash_locks + hash); |
59fc630b | 3815 | if (head_sh->batch_head) { |
3816 | sh = list_first_entry(&sh->batch_list, | |
3817 | struct stripe_head, batch_list); | |
3818 | if (sh != head_sh) | |
3819 | goto unhash; | |
3820 | } | |
59fc630b | 3821 | sh = head_sh; |
3822 | ||
f8dfcffd N |
3823 | if (test_bit(STRIPE_SYNC_REQUESTED, &sh->state)) |
3824 | set_bit(STRIPE_HANDLE, &sh->state); | |
3825 | ||
3826 | } | |
8b3e6cdc DW |
3827 | |
3828 | if (test_and_clear_bit(STRIPE_FULL_WRITE, &sh->state)) | |
3829 | if (atomic_dec_and_test(&conf->pending_full_writes)) | |
3830 | md_wakeup_thread(conf->mddev->thread); | |
59fc630b | 3831 | |
787b76fa N |
3832 | if (head_sh->batch_head && do_endio) |
3833 | break_stripe_batch_list(head_sh, STRIPE_EXPAND_SYNC_FLAGS); | |
a4456856 DW |
3834 | } |
3835 | ||
86aa1397 SL |
3836 | /* |
3837 | * For RMW in write back cache, we need extra page in prexor to store the | |
3838 | * old data. This page is stored in dev->orig_page. | |
3839 | * | |
3840 | * This function checks whether we have data for prexor. The exact logic | |
3841 | * is: | |
3842 | * R5_UPTODATE && (!R5_InJournal || R5_OrigPageUPTDODATE) | |
3843 | */ | |
3844 | static inline bool uptodate_for_rmw(struct r5dev *dev) | |
3845 | { | |
3846 | return (test_bit(R5_UPTODATE, &dev->flags)) && | |
3847 | (!test_bit(R5_InJournal, &dev->flags) || | |
3848 | test_bit(R5_OrigPageUPTDODATE, &dev->flags)); | |
3849 | } | |
3850 | ||
d7bd398e SL |
3851 | static int handle_stripe_dirtying(struct r5conf *conf, |
3852 | struct stripe_head *sh, | |
3853 | struct stripe_head_state *s, | |
3854 | int disks) | |
a4456856 DW |
3855 | { |
3856 | int rmw = 0, rcw = 0, i; | |
a7854487 AL |
3857 | sector_t recovery_cp = conf->mddev->recovery_cp; |
3858 | ||
584acdd4 | 3859 | /* Check whether resync is now happening or should start. |
a7854487 AL |
3860 | * If yes, then the array is dirty (after unclean shutdown or |
3861 | * initial creation), so parity in some stripes might be inconsistent. | |
3862 | * In this case, we need to always do reconstruct-write, to ensure | |
3863 | * that in case of drive failure or read-error correction, we | |
3864 | * generate correct data from the parity. | |
3865 | */ | |
584acdd4 | 3866 | if (conf->rmw_level == PARITY_DISABLE_RMW || |
26ac1073 N |
3867 | (recovery_cp < MaxSector && sh->sector >= recovery_cp && |
3868 | s->failed == 0)) { | |
a7854487 | 3869 | /* Calculate the real rcw later - for now make it |
c8ac1803 N |
3870 | * look like rcw is cheaper |
3871 | */ | |
3872 | rcw = 1; rmw = 2; | |
584acdd4 MS |
3873 | pr_debug("force RCW rmw_level=%u, recovery_cp=%llu sh->sector=%llu\n", |
3874 | conf->rmw_level, (unsigned long long)recovery_cp, | |
a7854487 | 3875 | (unsigned long long)sh->sector); |
c8ac1803 | 3876 | } else for (i = disks; i--; ) { |
a4456856 DW |
3877 | /* would I have to read this buffer for read_modify_write */ |
3878 | struct r5dev *dev = &sh->dev[i]; | |
39b99586 | 3879 | if (((dev->towrite && !delay_towrite(conf, dev, s)) || |
07e83364 | 3880 | i == sh->pd_idx || i == sh->qd_idx || |
1e6d690b | 3881 | test_bit(R5_InJournal, &dev->flags)) && |
a4456856 | 3882 | !test_bit(R5_LOCKED, &dev->flags) && |
86aa1397 | 3883 | !(uptodate_for_rmw(dev) || |
f38e1219 | 3884 | test_bit(R5_Wantcompute, &dev->flags))) { |
a4456856 DW |
3885 | if (test_bit(R5_Insync, &dev->flags)) |
3886 | rmw++; | |
3887 | else | |
3888 | rmw += 2*disks; /* cannot read it */ | |
3889 | } | |
3890 | /* Would I have to read this buffer for reconstruct_write */ | |
584acdd4 MS |
3891 | if (!test_bit(R5_OVERWRITE, &dev->flags) && |
3892 | i != sh->pd_idx && i != sh->qd_idx && | |
a4456856 | 3893 | !test_bit(R5_LOCKED, &dev->flags) && |
f38e1219 | 3894 | !(test_bit(R5_UPTODATE, &dev->flags) || |
1e6d690b | 3895 | test_bit(R5_Wantcompute, &dev->flags))) { |
67f45548 N |
3896 | if (test_bit(R5_Insync, &dev->flags)) |
3897 | rcw++; | |
a4456856 DW |
3898 | else |
3899 | rcw += 2*disks; | |
3900 | } | |
3901 | } | |
1e6d690b | 3902 | |
39b99586 SL |
3903 | pr_debug("for sector %llu state 0x%lx, rmw=%d rcw=%d\n", |
3904 | (unsigned long long)sh->sector, sh->state, rmw, rcw); | |
a4456856 | 3905 | set_bit(STRIPE_HANDLE, &sh->state); |
41257580 | 3906 | if ((rmw < rcw || (rmw == rcw && conf->rmw_level == PARITY_PREFER_RMW)) && rmw > 0) { |
a4456856 | 3907 | /* prefer read-modify-write, but need to get some data */ |
e3620a3a JB |
3908 | if (conf->mddev->queue) |
3909 | blk_add_trace_msg(conf->mddev->queue, | |
3910 | "raid5 rmw %llu %d", | |
3911 | (unsigned long long)sh->sector, rmw); | |
a4456856 DW |
3912 | for (i = disks; i--; ) { |
3913 | struct r5dev *dev = &sh->dev[i]; | |
1e6d690b SL |
3914 | if (test_bit(R5_InJournal, &dev->flags) && |
3915 | dev->page == dev->orig_page && | |
3916 | !test_bit(R5_LOCKED, &sh->dev[sh->pd_idx].flags)) { | |
3917 | /* alloc page for prexor */ | |
d7bd398e SL |
3918 | struct page *p = alloc_page(GFP_NOIO); |
3919 | ||
3920 | if (p) { | |
3921 | dev->orig_page = p; | |
3922 | continue; | |
3923 | } | |
3924 | ||
3925 | /* | |
3926 | * alloc_page() failed, try use | |
3927 | * disk_info->extra_page | |
3928 | */ | |
3929 | if (!test_and_set_bit(R5C_EXTRA_PAGE_IN_USE, | |
3930 | &conf->cache_state)) { | |
3931 | r5c_use_extra_page(sh); | |
3932 | break; | |
3933 | } | |
1e6d690b | 3934 | |
d7bd398e SL |
3935 | /* extra_page in use, add to delayed_list */ |
3936 | set_bit(STRIPE_DELAYED, &sh->state); | |
3937 | s->waiting_extra_page = 1; | |
3938 | return -EAGAIN; | |
1e6d690b | 3939 | } |
d7bd398e | 3940 | } |
1e6d690b | 3941 | |
d7bd398e SL |
3942 | for (i = disks; i--; ) { |
3943 | struct r5dev *dev = &sh->dev[i]; | |
39b99586 | 3944 | if (((dev->towrite && !delay_towrite(conf, dev, s)) || |
1e6d690b SL |
3945 | i == sh->pd_idx || i == sh->qd_idx || |
3946 | test_bit(R5_InJournal, &dev->flags)) && | |
a4456856 | 3947 | !test_bit(R5_LOCKED, &dev->flags) && |
86aa1397 | 3948 | !(uptodate_for_rmw(dev) || |
1e6d690b | 3949 | test_bit(R5_Wantcompute, &dev->flags)) && |
a4456856 | 3950 | test_bit(R5_Insync, &dev->flags)) { |
67f45548 N |
3951 | if (test_bit(STRIPE_PREREAD_ACTIVE, |
3952 | &sh->state)) { | |
3953 | pr_debug("Read_old block %d for r-m-w\n", | |
3954 | i); | |
a4456856 DW |
3955 | set_bit(R5_LOCKED, &dev->flags); |
3956 | set_bit(R5_Wantread, &dev->flags); | |
3957 | s->locked++; | |
3958 | } else { | |
3959 | set_bit(STRIPE_DELAYED, &sh->state); | |
3960 | set_bit(STRIPE_HANDLE, &sh->state); | |
3961 | } | |
3962 | } | |
3963 | } | |
a9add5d9 | 3964 | } |
41257580 | 3965 | if ((rcw < rmw || (rcw == rmw && conf->rmw_level != PARITY_PREFER_RMW)) && rcw > 0) { |
a4456856 | 3966 | /* want reconstruct write, but need to get some data */ |
a9add5d9 | 3967 | int qread =0; |
c8ac1803 | 3968 | rcw = 0; |
a4456856 DW |
3969 | for (i = disks; i--; ) { |
3970 | struct r5dev *dev = &sh->dev[i]; | |
3971 | if (!test_bit(R5_OVERWRITE, &dev->flags) && | |
c8ac1803 | 3972 | i != sh->pd_idx && i != sh->qd_idx && |
a4456856 | 3973 | !test_bit(R5_LOCKED, &dev->flags) && |
f38e1219 | 3974 | !(test_bit(R5_UPTODATE, &dev->flags) || |
c8ac1803 N |
3975 | test_bit(R5_Wantcompute, &dev->flags))) { |
3976 | rcw++; | |
67f45548 N |
3977 | if (test_bit(R5_Insync, &dev->flags) && |
3978 | test_bit(STRIPE_PREREAD_ACTIVE, | |
3979 | &sh->state)) { | |
45b4233c | 3980 | pr_debug("Read_old block " |
a4456856 DW |
3981 | "%d for Reconstruct\n", i); |
3982 | set_bit(R5_LOCKED, &dev->flags); | |
3983 | set_bit(R5_Wantread, &dev->flags); | |
3984 | s->locked++; | |
a9add5d9 | 3985 | qread++; |
a4456856 DW |
3986 | } else { |
3987 | set_bit(STRIPE_DELAYED, &sh->state); | |
3988 | set_bit(STRIPE_HANDLE, &sh->state); | |
3989 | } | |
3990 | } | |
3991 | } | |
e3620a3a | 3992 | if (rcw && conf->mddev->queue) |
a9add5d9 N |
3993 | blk_add_trace_msg(conf->mddev->queue, "raid5 rcw %llu %d %d %d", |
3994 | (unsigned long long)sh->sector, | |
3995 | rcw, qread, test_bit(STRIPE_DELAYED, &sh->state)); | |
c8ac1803 | 3996 | } |
b1b02fe9 N |
3997 | |
3998 | if (rcw > disks && rmw > disks && | |
3999 | !test_bit(STRIPE_PREREAD_ACTIVE, &sh->state)) | |
4000 | set_bit(STRIPE_DELAYED, &sh->state); | |
4001 | ||
a4456856 DW |
4002 | /* now if nothing is locked, and if we have enough data, |
4003 | * we can start a write request | |
4004 | */ | |
f38e1219 DW |
4005 | /* since handle_stripe can be called at any time we need to handle the |
4006 | * case where a compute block operation has been submitted and then a | |
ac6b53b6 DW |
4007 | * subsequent call wants to start a write request. raid_run_ops only |
4008 | * handles the case where compute block and reconstruct are requested | |
f38e1219 DW |
4009 | * simultaneously. If this is not the case then new writes need to be |
4010 | * held off until the compute completes. | |
4011 | */ | |
976ea8d4 DW |
4012 | if ((s->req_compute || !test_bit(STRIPE_COMPUTE_RUN, &sh->state)) && |
4013 | (s->locked == 0 && (rcw == 0 || rmw == 0) && | |
1e6d690b | 4014 | !test_bit(STRIPE_BIT_DELAY, &sh->state))) |
c0f7bddb | 4015 | schedule_reconstruction(sh, s, rcw == 0, 0); |
d7bd398e | 4016 | return 0; |
a4456856 DW |
4017 | } |
4018 | ||
d1688a6d | 4019 | static void handle_parity_checks5(struct r5conf *conf, struct stripe_head *sh, |
a4456856 DW |
4020 | struct stripe_head_state *s, int disks) |
4021 | { | |
ecc65c9b | 4022 | struct r5dev *dev = NULL; |
bd2ab670 | 4023 | |
59fc630b | 4024 | BUG_ON(sh->batch_head); |
a4456856 | 4025 | set_bit(STRIPE_HANDLE, &sh->state); |
e89f8962 | 4026 | |
ecc65c9b DW |
4027 | switch (sh->check_state) { |
4028 | case check_state_idle: | |
4029 | /* start a new check operation if there are no failures */ | |
bd2ab670 | 4030 | if (s->failed == 0) { |
bd2ab670 | 4031 | BUG_ON(s->uptodate != disks); |
ecc65c9b DW |
4032 | sh->check_state = check_state_run; |
4033 | set_bit(STRIPE_OP_CHECK, &s->ops_request); | |
bd2ab670 | 4034 | clear_bit(R5_UPTODATE, &sh->dev[sh->pd_idx].flags); |
bd2ab670 | 4035 | s->uptodate--; |
ecc65c9b | 4036 | break; |
bd2ab670 | 4037 | } |
f2b3b44d | 4038 | dev = &sh->dev[s->failed_num[0]]; |
ecc65c9b DW |
4039 | /* fall through */ |
4040 | case check_state_compute_result: | |
4041 | sh->check_state = check_state_idle; | |
4042 | if (!dev) | |
4043 | dev = &sh->dev[sh->pd_idx]; | |
4044 | ||
4045 | /* check that a write has not made the stripe insync */ | |
4046 | if (test_bit(STRIPE_INSYNC, &sh->state)) | |
4047 | break; | |
c8894419 | 4048 | |
a4456856 | 4049 | /* either failed parity check, or recovery is happening */ |
a4456856 DW |
4050 | BUG_ON(!test_bit(R5_UPTODATE, &dev->flags)); |
4051 | BUG_ON(s->uptodate != disks); | |
4052 | ||
4053 | set_bit(R5_LOCKED, &dev->flags); | |
ecc65c9b | 4054 | s->locked++; |
a4456856 | 4055 | set_bit(R5_Wantwrite, &dev->flags); |
830ea016 | 4056 | |
a4456856 | 4057 | clear_bit(STRIPE_DEGRADED, &sh->state); |
a4456856 | 4058 | set_bit(STRIPE_INSYNC, &sh->state); |
ecc65c9b DW |
4059 | break; |
4060 | case check_state_run: | |
4061 | break; /* we will be called again upon completion */ | |
4062 | case check_state_check_result: | |
4063 | sh->check_state = check_state_idle; | |
4064 | ||
4065 | /* if a failure occurred during the check operation, leave | |
4066 | * STRIPE_INSYNC not set and let the stripe be handled again | |
4067 | */ | |
4068 | if (s->failed) | |
4069 | break; | |
4070 | ||
4071 | /* handle a successful check operation, if parity is correct | |
4072 | * we are done. Otherwise update the mismatch count and repair | |
4073 | * parity if !MD_RECOVERY_CHECK | |
4074 | */ | |
ad283ea4 | 4075 | if ((sh->ops.zero_sum_result & SUM_CHECK_P_RESULT) == 0) |
ecc65c9b DW |
4076 | /* parity is correct (on disc, |
4077 | * not in buffer any more) | |
4078 | */ | |
4079 | set_bit(STRIPE_INSYNC, &sh->state); | |
4080 | else { | |
7f7583d4 | 4081 | atomic64_add(STRIPE_SECTORS, &conf->mddev->resync_mismatches); |
ecc65c9b DW |
4082 | if (test_bit(MD_RECOVERY_CHECK, &conf->mddev->recovery)) |
4083 | /* don't try to repair!! */ | |
4084 | set_bit(STRIPE_INSYNC, &sh->state); | |
4085 | else { | |
4086 | sh->check_state = check_state_compute_run; | |
976ea8d4 | 4087 | set_bit(STRIPE_COMPUTE_RUN, &sh->state); |
ecc65c9b DW |
4088 | set_bit(STRIPE_OP_COMPUTE_BLK, &s->ops_request); |
4089 | set_bit(R5_Wantcompute, | |
4090 | &sh->dev[sh->pd_idx].flags); | |
4091 | sh->ops.target = sh->pd_idx; | |
ac6b53b6 | 4092 | sh->ops.target2 = -1; |
ecc65c9b DW |
4093 | s->uptodate++; |
4094 | } | |
4095 | } | |
4096 | break; | |
4097 | case check_state_compute_run: | |
4098 | break; | |
4099 | default: | |
cc6167b4 | 4100 | pr_err("%s: unknown check_state: %d sector: %llu\n", |
ecc65c9b DW |
4101 | __func__, sh->check_state, |
4102 | (unsigned long long) sh->sector); | |
4103 | BUG(); | |
a4456856 DW |
4104 | } |
4105 | } | |
4106 | ||
d1688a6d | 4107 | static void handle_parity_checks6(struct r5conf *conf, struct stripe_head *sh, |
36d1c647 | 4108 | struct stripe_head_state *s, |
f2b3b44d | 4109 | int disks) |
a4456856 | 4110 | { |
a4456856 | 4111 | int pd_idx = sh->pd_idx; |
34e04e87 | 4112 | int qd_idx = sh->qd_idx; |
d82dfee0 | 4113 | struct r5dev *dev; |
a4456856 | 4114 | |
59fc630b | 4115 | BUG_ON(sh->batch_head); |
a4456856 DW |
4116 | set_bit(STRIPE_HANDLE, &sh->state); |
4117 | ||
4118 | BUG_ON(s->failed > 2); | |
d82dfee0 | 4119 | |
a4456856 DW |
4120 | /* Want to check and possibly repair P and Q. |
4121 | * However there could be one 'failed' device, in which | |
4122 | * case we can only check one of them, possibly using the | |
4123 | * other to generate missing data | |
4124 | */ | |
4125 | ||
d82dfee0 DW |
4126 | switch (sh->check_state) { |
4127 | case check_state_idle: | |
4128 | /* start a new check operation if there are < 2 failures */ | |
f2b3b44d | 4129 | if (s->failed == s->q_failed) { |
d82dfee0 | 4130 | /* The only possible failed device holds Q, so it |
a4456856 DW |
4131 | * makes sense to check P (If anything else were failed, |
4132 | * we would have used P to recreate it). | |
4133 | */ | |
d82dfee0 | 4134 | sh->check_state = check_state_run; |
a4456856 | 4135 | } |
f2b3b44d | 4136 | if (!s->q_failed && s->failed < 2) { |
d82dfee0 | 4137 | /* Q is not failed, and we didn't use it to generate |
a4456856 DW |
4138 | * anything, so it makes sense to check it |
4139 | */ | |
d82dfee0 DW |
4140 | if (sh->check_state == check_state_run) |
4141 | sh->check_state = check_state_run_pq; | |
4142 | else | |
4143 | sh->check_state = check_state_run_q; | |
a4456856 | 4144 | } |
a4456856 | 4145 | |
d82dfee0 DW |
4146 | /* discard potentially stale zero_sum_result */ |
4147 | sh->ops.zero_sum_result = 0; | |
a4456856 | 4148 | |
d82dfee0 DW |
4149 | if (sh->check_state == check_state_run) { |
4150 | /* async_xor_zero_sum destroys the contents of P */ | |
4151 | clear_bit(R5_UPTODATE, &sh->dev[pd_idx].flags); | |
4152 | s->uptodate--; | |
a4456856 | 4153 | } |
d82dfee0 DW |
4154 | if (sh->check_state >= check_state_run && |
4155 | sh->check_state <= check_state_run_pq) { | |
4156 | /* async_syndrome_zero_sum preserves P and Q, so | |
4157 | * no need to mark them !uptodate here | |
4158 | */ | |
4159 | set_bit(STRIPE_OP_CHECK, &s->ops_request); | |
4160 | break; | |
a4456856 DW |
4161 | } |
4162 | ||
d82dfee0 DW |
4163 | /* we have 2-disk failure */ |
4164 | BUG_ON(s->failed != 2); | |
4165 | /* fall through */ | |
4166 | case check_state_compute_result: | |
4167 | sh->check_state = check_state_idle; | |
a4456856 | 4168 | |
d82dfee0 DW |
4169 | /* check that a write has not made the stripe insync */ |
4170 | if (test_bit(STRIPE_INSYNC, &sh->state)) | |
4171 | break; | |
a4456856 DW |
4172 | |
4173 | /* now write out any block on a failed drive, | |
d82dfee0 | 4174 | * or P or Q if they were recomputed |
a4456856 | 4175 | */ |
d82dfee0 | 4176 | BUG_ON(s->uptodate < disks - 1); /* We don't need Q to recover */ |
a4456856 | 4177 | if (s->failed == 2) { |
f2b3b44d | 4178 | dev = &sh->dev[s->failed_num[1]]; |
a4456856 DW |
4179 | s->locked++; |
4180 | set_bit(R5_LOCKED, &dev->flags); | |
4181 | set_bit(R5_Wantwrite, &dev->flags); | |
4182 | } | |
4183 | if (s->failed >= 1) { | |
f2b3b44d | 4184 | dev = &sh->dev[s->failed_num[0]]; |
a4456856 DW |
4185 | s->locked++; |
4186 | set_bit(R5_LOCKED, &dev->flags); | |
4187 | set_bit(R5_Wantwrite, &dev->flags); | |
4188 | } | |
d82dfee0 | 4189 | if (sh->ops.zero_sum_result & SUM_CHECK_P_RESULT) { |
a4456856 DW |
4190 | dev = &sh->dev[pd_idx]; |
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_Q_RESULT) { |
a4456856 DW |
4196 | dev = &sh->dev[qd_idx]; |
4197 | s->locked++; | |
4198 | set_bit(R5_LOCKED, &dev->flags); | |
4199 | set_bit(R5_Wantwrite, &dev->flags); | |
4200 | } | |
4201 | clear_bit(STRIPE_DEGRADED, &sh->state); | |
4202 | ||
4203 | set_bit(STRIPE_INSYNC, &sh->state); | |
d82dfee0 DW |
4204 | break; |
4205 | case check_state_run: | |
4206 | case check_state_run_q: | |
4207 | case check_state_run_pq: | |
4208 | break; /* we will be called again upon completion */ | |
4209 | case check_state_check_result: | |
4210 | sh->check_state = check_state_idle; | |
4211 | ||
4212 | /* handle a successful check operation, if parity is correct | |
4213 | * we are done. Otherwise update the mismatch count and repair | |
4214 | * parity if !MD_RECOVERY_CHECK | |
4215 | */ | |
4216 | if (sh->ops.zero_sum_result == 0) { | |
4217 | /* both parities are correct */ | |
4218 | if (!s->failed) | |
4219 | set_bit(STRIPE_INSYNC, &sh->state); | |
4220 | else { | |
4221 | /* in contrast to the raid5 case we can validate | |
4222 | * parity, but still have a failure to write | |
4223 | * back | |
4224 | */ | |
4225 | sh->check_state = check_state_compute_result; | |
4226 | /* Returning at this point means that we may go | |
4227 | * off and bring p and/or q uptodate again so | |
4228 | * we make sure to check zero_sum_result again | |
4229 | * to verify if p or q need writeback | |
4230 | */ | |
4231 | } | |
4232 | } else { | |
7f7583d4 | 4233 | atomic64_add(STRIPE_SECTORS, &conf->mddev->resync_mismatches); |
d82dfee0 DW |
4234 | if (test_bit(MD_RECOVERY_CHECK, &conf->mddev->recovery)) |
4235 | /* don't try to repair!! */ | |
4236 | set_bit(STRIPE_INSYNC, &sh->state); | |
4237 | else { | |
4238 | int *target = &sh->ops.target; | |
4239 | ||
4240 | sh->ops.target = -1; | |
4241 | sh->ops.target2 = -1; | |
4242 | sh->check_state = check_state_compute_run; | |
4243 | set_bit(STRIPE_COMPUTE_RUN, &sh->state); | |
4244 | set_bit(STRIPE_OP_COMPUTE_BLK, &s->ops_request); | |
4245 | if (sh->ops.zero_sum_result & SUM_CHECK_P_RESULT) { | |
4246 | set_bit(R5_Wantcompute, | |
4247 | &sh->dev[pd_idx].flags); | |
4248 | *target = pd_idx; | |
4249 | target = &sh->ops.target2; | |
4250 | s->uptodate++; | |
4251 | } | |
4252 | if (sh->ops.zero_sum_result & SUM_CHECK_Q_RESULT) { | |
4253 | set_bit(R5_Wantcompute, | |
4254 | &sh->dev[qd_idx].flags); | |
4255 | *target = qd_idx; | |
4256 | s->uptodate++; | |
4257 | } | |
4258 | } | |
4259 | } | |
4260 | break; | |
4261 | case check_state_compute_run: | |
4262 | break; | |
4263 | default: | |
cc6167b4 N |
4264 | pr_warn("%s: unknown check_state: %d sector: %llu\n", |
4265 | __func__, sh->check_state, | |
4266 | (unsigned long long) sh->sector); | |
d82dfee0 | 4267 | BUG(); |
a4456856 DW |
4268 | } |
4269 | } | |
4270 | ||
d1688a6d | 4271 | static void handle_stripe_expansion(struct r5conf *conf, struct stripe_head *sh) |
a4456856 DW |
4272 | { |
4273 | int i; | |
4274 | ||
4275 | /* We have read all the blocks in this stripe and now we need to | |
4276 | * copy some of them into a target stripe for expand. | |
4277 | */ | |
f0a50d37 | 4278 | struct dma_async_tx_descriptor *tx = NULL; |
59fc630b | 4279 | BUG_ON(sh->batch_head); |
a4456856 DW |
4280 | clear_bit(STRIPE_EXPAND_SOURCE, &sh->state); |
4281 | for (i = 0; i < sh->disks; i++) | |
34e04e87 | 4282 | if (i != sh->pd_idx && i != sh->qd_idx) { |
911d4ee8 | 4283 | int dd_idx, j; |
a4456856 | 4284 | struct stripe_head *sh2; |
a08abd8c | 4285 | struct async_submit_ctl submit; |
a4456856 | 4286 | |
6d036f7d | 4287 | sector_t bn = raid5_compute_blocknr(sh, i, 1); |
911d4ee8 N |
4288 | sector_t s = raid5_compute_sector(conf, bn, 0, |
4289 | &dd_idx, NULL); | |
6d036f7d | 4290 | sh2 = raid5_get_active_stripe(conf, s, 0, 1, 1); |
a4456856 DW |
4291 | if (sh2 == NULL) |
4292 | /* so far only the early blocks of this stripe | |
4293 | * have been requested. When later blocks | |
4294 | * get requested, we will try again | |
4295 | */ | |
4296 | continue; | |
4297 | if (!test_bit(STRIPE_EXPANDING, &sh2->state) || | |
4298 | test_bit(R5_Expanded, &sh2->dev[dd_idx].flags)) { | |
4299 | /* must have already done this block */ | |
6d036f7d | 4300 | raid5_release_stripe(sh2); |
a4456856 DW |
4301 | continue; |
4302 | } | |
f0a50d37 DW |
4303 | |
4304 | /* place all the copies on one channel */ | |
a08abd8c | 4305 | init_async_submit(&submit, 0, tx, NULL, NULL, NULL); |
f0a50d37 | 4306 | tx = async_memcpy(sh2->dev[dd_idx].page, |
88ba2aa5 | 4307 | sh->dev[i].page, 0, 0, STRIPE_SIZE, |
a08abd8c | 4308 | &submit); |
f0a50d37 | 4309 | |
a4456856 DW |
4310 | set_bit(R5_Expanded, &sh2->dev[dd_idx].flags); |
4311 | set_bit(R5_UPTODATE, &sh2->dev[dd_idx].flags); | |
4312 | for (j = 0; j < conf->raid_disks; j++) | |
4313 | if (j != sh2->pd_idx && | |
86c374ba | 4314 | j != sh2->qd_idx && |
a4456856 DW |
4315 | !test_bit(R5_Expanded, &sh2->dev[j].flags)) |
4316 | break; | |
4317 | if (j == conf->raid_disks) { | |
4318 | set_bit(STRIPE_EXPAND_READY, &sh2->state); | |
4319 | set_bit(STRIPE_HANDLE, &sh2->state); | |
4320 | } | |
6d036f7d | 4321 | raid5_release_stripe(sh2); |
f0a50d37 | 4322 | |
a4456856 | 4323 | } |
a2e08551 | 4324 | /* done submitting copies, wait for them to complete */ |
749586b7 | 4325 | async_tx_quiesce(&tx); |
a4456856 | 4326 | } |
1da177e4 LT |
4327 | |
4328 | /* | |
4329 | * handle_stripe - do things to a stripe. | |
4330 | * | |
9a3e1101 N |
4331 | * We lock the stripe by setting STRIPE_ACTIVE and then examine the |
4332 | * state of various bits to see what needs to be done. | |
1da177e4 | 4333 | * Possible results: |
9a3e1101 N |
4334 | * return some read requests which now have data |
4335 | * return some write requests which are safely on storage | |
1da177e4 LT |
4336 | * schedule a read on some buffers |
4337 | * schedule a write of some buffers | |
4338 | * return confirmation of parity correctness | |
4339 | * | |
1da177e4 | 4340 | */ |
a4456856 | 4341 | |
acfe726b | 4342 | static void analyse_stripe(struct stripe_head *sh, struct stripe_head_state *s) |
1da177e4 | 4343 | { |
d1688a6d | 4344 | struct r5conf *conf = sh->raid_conf; |
f416885e | 4345 | int disks = sh->disks; |
474af965 N |
4346 | struct r5dev *dev; |
4347 | int i; | |
9a3e1101 | 4348 | int do_recovery = 0; |
1da177e4 | 4349 | |
acfe726b N |
4350 | memset(s, 0, sizeof(*s)); |
4351 | ||
dabc4ec6 | 4352 | s->expanding = test_bit(STRIPE_EXPAND_SOURCE, &sh->state) && !sh->batch_head; |
4353 | s->expanded = test_bit(STRIPE_EXPAND_READY, &sh->state) && !sh->batch_head; | |
acfe726b N |
4354 | s->failed_num[0] = -1; |
4355 | s->failed_num[1] = -1; | |
6e74a9cf | 4356 | s->log_failed = r5l_log_disk_error(conf); |
1da177e4 | 4357 | |
acfe726b | 4358 | /* Now to look around and see what can be done */ |
1da177e4 | 4359 | rcu_read_lock(); |
16a53ecc | 4360 | for (i=disks; i--; ) { |
3cb03002 | 4361 | struct md_rdev *rdev; |
31c176ec N |
4362 | sector_t first_bad; |
4363 | int bad_sectors; | |
4364 | int is_bad = 0; | |
acfe726b | 4365 | |
16a53ecc | 4366 | dev = &sh->dev[i]; |
1da177e4 | 4367 | |
45b4233c | 4368 | pr_debug("check %d: state 0x%lx read %p write %p written %p\n", |
9a3e1101 N |
4369 | i, dev->flags, |
4370 | dev->toread, dev->towrite, dev->written); | |
6c0069c0 YT |
4371 | /* maybe we can reply to a read |
4372 | * | |
4373 | * new wantfill requests are only permitted while | |
4374 | * ops_complete_biofill is guaranteed to be inactive | |
4375 | */ | |
4376 | if (test_bit(R5_UPTODATE, &dev->flags) && dev->toread && | |
4377 | !test_bit(STRIPE_BIOFILL_RUN, &sh->state)) | |
4378 | set_bit(R5_Wantfill, &dev->flags); | |
1da177e4 | 4379 | |
16a53ecc | 4380 | /* now count some things */ |
cc94015a N |
4381 | if (test_bit(R5_LOCKED, &dev->flags)) |
4382 | s->locked++; | |
4383 | if (test_bit(R5_UPTODATE, &dev->flags)) | |
4384 | s->uptodate++; | |
2d6e4ecc | 4385 | if (test_bit(R5_Wantcompute, &dev->flags)) { |
cc94015a N |
4386 | s->compute++; |
4387 | BUG_ON(s->compute > 2); | |
2d6e4ecc | 4388 | } |
1da177e4 | 4389 | |
acfe726b | 4390 | if (test_bit(R5_Wantfill, &dev->flags)) |
cc94015a | 4391 | s->to_fill++; |
acfe726b | 4392 | else if (dev->toread) |
cc94015a | 4393 | s->to_read++; |
16a53ecc | 4394 | if (dev->towrite) { |
cc94015a | 4395 | s->to_write++; |
16a53ecc | 4396 | if (!test_bit(R5_OVERWRITE, &dev->flags)) |
cc94015a | 4397 | s->non_overwrite++; |
16a53ecc | 4398 | } |
a4456856 | 4399 | if (dev->written) |
cc94015a | 4400 | s->written++; |
14a75d3e N |
4401 | /* Prefer to use the replacement for reads, but only |
4402 | * if it is recovered enough and has no bad blocks. | |
4403 | */ | |
4404 | rdev = rcu_dereference(conf->disks[i].replacement); | |
4405 | if (rdev && !test_bit(Faulty, &rdev->flags) && | |
4406 | rdev->recovery_offset >= sh->sector + STRIPE_SECTORS && | |
4407 | !is_badblock(rdev, sh->sector, STRIPE_SECTORS, | |
4408 | &first_bad, &bad_sectors)) | |
4409 | set_bit(R5_ReadRepl, &dev->flags); | |
4410 | else { | |
e6030cb0 | 4411 | if (rdev && !test_bit(Faulty, &rdev->flags)) |
9a3e1101 | 4412 | set_bit(R5_NeedReplace, &dev->flags); |
e6030cb0 N |
4413 | else |
4414 | clear_bit(R5_NeedReplace, &dev->flags); | |
14a75d3e N |
4415 | rdev = rcu_dereference(conf->disks[i].rdev); |
4416 | clear_bit(R5_ReadRepl, &dev->flags); | |
4417 | } | |
9283d8c5 N |
4418 | if (rdev && test_bit(Faulty, &rdev->flags)) |
4419 | rdev = NULL; | |
31c176ec N |
4420 | if (rdev) { |
4421 | is_bad = is_badblock(rdev, sh->sector, STRIPE_SECTORS, | |
4422 | &first_bad, &bad_sectors); | |
4423 | if (s->blocked_rdev == NULL | |
4424 | && (test_bit(Blocked, &rdev->flags) | |
4425 | || is_bad < 0)) { | |
4426 | if (is_bad < 0) | |
4427 | set_bit(BlockedBadBlocks, | |
4428 | &rdev->flags); | |
4429 | s->blocked_rdev = rdev; | |
4430 | atomic_inc(&rdev->nr_pending); | |
4431 | } | |
6bfe0b49 | 4432 | } |
415e72d0 N |
4433 | clear_bit(R5_Insync, &dev->flags); |
4434 | if (!rdev) | |
4435 | /* Not in-sync */; | |
31c176ec N |
4436 | else if (is_bad) { |
4437 | /* also not in-sync */ | |
18b9837e N |
4438 | if (!test_bit(WriteErrorSeen, &rdev->flags) && |
4439 | test_bit(R5_UPTODATE, &dev->flags)) { | |
31c176ec N |
4440 | /* treat as in-sync, but with a read error |
4441 | * which we can now try to correct | |
4442 | */ | |
4443 | set_bit(R5_Insync, &dev->flags); | |
4444 | set_bit(R5_ReadError, &dev->flags); | |
4445 | } | |
4446 | } else if (test_bit(In_sync, &rdev->flags)) | |
415e72d0 | 4447 | set_bit(R5_Insync, &dev->flags); |
30d7a483 | 4448 | else if (sh->sector + STRIPE_SECTORS <= rdev->recovery_offset) |
415e72d0 | 4449 | /* in sync if before recovery_offset */ |
30d7a483 N |
4450 | set_bit(R5_Insync, &dev->flags); |
4451 | else if (test_bit(R5_UPTODATE, &dev->flags) && | |
4452 | test_bit(R5_Expanded, &dev->flags)) | |
4453 | /* If we've reshaped into here, we assume it is Insync. | |
4454 | * We will shortly update recovery_offset to make | |
4455 | * it official. | |
4456 | */ | |
4457 | set_bit(R5_Insync, &dev->flags); | |
4458 | ||
1cc03eb9 | 4459 | if (test_bit(R5_WriteError, &dev->flags)) { |
14a75d3e N |
4460 | /* This flag does not apply to '.replacement' |
4461 | * only to .rdev, so make sure to check that*/ | |
4462 | struct md_rdev *rdev2 = rcu_dereference( | |
4463 | conf->disks[i].rdev); | |
4464 | if (rdev2 == rdev) | |
4465 | clear_bit(R5_Insync, &dev->flags); | |
4466 | if (rdev2 && !test_bit(Faulty, &rdev2->flags)) { | |
bc2607f3 | 4467 | s->handle_bad_blocks = 1; |
14a75d3e | 4468 | atomic_inc(&rdev2->nr_pending); |
bc2607f3 N |
4469 | } else |
4470 | clear_bit(R5_WriteError, &dev->flags); | |
4471 | } | |
1cc03eb9 | 4472 | if (test_bit(R5_MadeGood, &dev->flags)) { |
14a75d3e N |
4473 | /* This flag does not apply to '.replacement' |
4474 | * only to .rdev, so make sure to check that*/ | |
4475 | struct md_rdev *rdev2 = rcu_dereference( | |
4476 | conf->disks[i].rdev); | |
4477 | if (rdev2 && !test_bit(Faulty, &rdev2->flags)) { | |
b84db560 | 4478 | s->handle_bad_blocks = 1; |
14a75d3e | 4479 | atomic_inc(&rdev2->nr_pending); |
b84db560 N |
4480 | } else |
4481 | clear_bit(R5_MadeGood, &dev->flags); | |
4482 | } | |
977df362 N |
4483 | if (test_bit(R5_MadeGoodRepl, &dev->flags)) { |
4484 | struct md_rdev *rdev2 = rcu_dereference( | |
4485 | conf->disks[i].replacement); | |
4486 | if (rdev2 && !test_bit(Faulty, &rdev2->flags)) { | |
4487 | s->handle_bad_blocks = 1; | |
4488 | atomic_inc(&rdev2->nr_pending); | |
4489 | } else | |
4490 | clear_bit(R5_MadeGoodRepl, &dev->flags); | |
4491 | } | |
415e72d0 | 4492 | if (!test_bit(R5_Insync, &dev->flags)) { |
16a53ecc N |
4493 | /* The ReadError flag will just be confusing now */ |
4494 | clear_bit(R5_ReadError, &dev->flags); | |
4495 | clear_bit(R5_ReWrite, &dev->flags); | |
1da177e4 | 4496 | } |
415e72d0 N |
4497 | if (test_bit(R5_ReadError, &dev->flags)) |
4498 | clear_bit(R5_Insync, &dev->flags); | |
4499 | if (!test_bit(R5_Insync, &dev->flags)) { | |
cc94015a N |
4500 | if (s->failed < 2) |
4501 | s->failed_num[s->failed] = i; | |
4502 | s->failed++; | |
9a3e1101 N |
4503 | if (rdev && !test_bit(Faulty, &rdev->flags)) |
4504 | do_recovery = 1; | |
415e72d0 | 4505 | } |
2ded3703 SL |
4506 | |
4507 | if (test_bit(R5_InJournal, &dev->flags)) | |
4508 | s->injournal++; | |
1e6d690b SL |
4509 | if (test_bit(R5_InJournal, &dev->flags) && dev->written) |
4510 | s->just_cached++; | |
1da177e4 | 4511 | } |
9a3e1101 N |
4512 | if (test_bit(STRIPE_SYNCING, &sh->state)) { |
4513 | /* If there is a failed device being replaced, | |
4514 | * we must be recovering. | |
4515 | * else if we are after recovery_cp, we must be syncing | |
c6d2e084 | 4516 | * else if MD_RECOVERY_REQUESTED is set, we also are syncing. |
9a3e1101 N |
4517 | * else we can only be replacing |
4518 | * sync and recovery both need to read all devices, and so | |
4519 | * use the same flag. | |
4520 | */ | |
4521 | if (do_recovery || | |
c6d2e084 | 4522 | sh->sector >= conf->mddev->recovery_cp || |
4523 | test_bit(MD_RECOVERY_REQUESTED, &(conf->mddev->recovery))) | |
9a3e1101 N |
4524 | s->syncing = 1; |
4525 | else | |
4526 | s->replacing = 1; | |
4527 | } | |
1da177e4 | 4528 | rcu_read_unlock(); |
cc94015a N |
4529 | } |
4530 | ||
59fc630b | 4531 | static int clear_batch_ready(struct stripe_head *sh) |
4532 | { | |
b15a9dbd N |
4533 | /* Return '1' if this is a member of batch, or |
4534 | * '0' if it is a lone stripe or a head which can now be | |
4535 | * handled. | |
4536 | */ | |
59fc630b | 4537 | struct stripe_head *tmp; |
4538 | if (!test_and_clear_bit(STRIPE_BATCH_READY, &sh->state)) | |
b15a9dbd | 4539 | return (sh->batch_head && sh->batch_head != sh); |
59fc630b | 4540 | spin_lock(&sh->stripe_lock); |
4541 | if (!sh->batch_head) { | |
4542 | spin_unlock(&sh->stripe_lock); | |
4543 | return 0; | |
4544 | } | |
4545 | ||
4546 | /* | |
4547 | * this stripe could be added to a batch list before we check | |
4548 | * BATCH_READY, skips it | |
4549 | */ | |
4550 | if (sh->batch_head != sh) { | |
4551 | spin_unlock(&sh->stripe_lock); | |
4552 | return 1; | |
4553 | } | |
4554 | spin_lock(&sh->batch_lock); | |
4555 | list_for_each_entry(tmp, &sh->batch_list, batch_list) | |
4556 | clear_bit(STRIPE_BATCH_READY, &tmp->state); | |
4557 | spin_unlock(&sh->batch_lock); | |
4558 | spin_unlock(&sh->stripe_lock); | |
4559 | ||
4560 | /* | |
4561 | * BATCH_READY is cleared, no new stripes can be added. | |
4562 | * batch_list can be accessed without lock | |
4563 | */ | |
4564 | return 0; | |
4565 | } | |
4566 | ||
3960ce79 N |
4567 | static void break_stripe_batch_list(struct stripe_head *head_sh, |
4568 | unsigned long handle_flags) | |
72ac7330 | 4569 | { |
4e3d62ff | 4570 | struct stripe_head *sh, *next; |
72ac7330 | 4571 | int i; |
fb642b92 | 4572 | int do_wakeup = 0; |
72ac7330 | 4573 | |
bb27051f N |
4574 | list_for_each_entry_safe(sh, next, &head_sh->batch_list, batch_list) { |
4575 | ||
72ac7330 | 4576 | list_del_init(&sh->batch_list); |
4577 | ||
fb3229d5 | 4578 | WARN_ONCE(sh->state & ((1 << STRIPE_ACTIVE) | |
1b956f7a N |
4579 | (1 << STRIPE_SYNCING) | |
4580 | (1 << STRIPE_REPLACED) | | |
1b956f7a N |
4581 | (1 << STRIPE_DELAYED) | |
4582 | (1 << STRIPE_BIT_DELAY) | | |
4583 | (1 << STRIPE_FULL_WRITE) | | |
4584 | (1 << STRIPE_BIOFILL_RUN) | | |
4585 | (1 << STRIPE_COMPUTE_RUN) | | |
4586 | (1 << STRIPE_OPS_REQ_PENDING) | | |
4587 | (1 << STRIPE_DISCARD) | | |
4588 | (1 << STRIPE_BATCH_READY) | | |
4589 | (1 << STRIPE_BATCH_ERR) | | |
fb3229d5 SL |
4590 | (1 << STRIPE_BITMAP_PENDING)), |
4591 | "stripe state: %lx\n", sh->state); | |
4592 | WARN_ONCE(head_sh->state & ((1 << STRIPE_DISCARD) | | |
4593 | (1 << STRIPE_REPLACED)), | |
4594 | "head stripe state: %lx\n", head_sh->state); | |
1b956f7a N |
4595 | |
4596 | set_mask_bits(&sh->state, ~(STRIPE_EXPAND_SYNC_FLAGS | | |
550da24f | 4597 | (1 << STRIPE_PREREAD_ACTIVE) | |
1b956f7a N |
4598 | (1 << STRIPE_DEGRADED)), |
4599 | head_sh->state & (1 << STRIPE_INSYNC)); | |
4600 | ||
72ac7330 | 4601 | sh->check_state = head_sh->check_state; |
4602 | sh->reconstruct_state = head_sh->reconstruct_state; | |
fb642b92 N |
4603 | for (i = 0; i < sh->disks; i++) { |
4604 | if (test_and_clear_bit(R5_Overlap, &sh->dev[i].flags)) | |
4605 | do_wakeup = 1; | |
72ac7330 | 4606 | sh->dev[i].flags = head_sh->dev[i].flags & |
4607 | (~((1 << R5_WriteError) | (1 << R5_Overlap))); | |
fb642b92 | 4608 | } |
72ac7330 | 4609 | spin_lock_irq(&sh->stripe_lock); |
4610 | sh->batch_head = NULL; | |
4611 | spin_unlock_irq(&sh->stripe_lock); | |
3960ce79 N |
4612 | if (handle_flags == 0 || |
4613 | sh->state & handle_flags) | |
4614 | set_bit(STRIPE_HANDLE, &sh->state); | |
6d036f7d | 4615 | raid5_release_stripe(sh); |
72ac7330 | 4616 | } |
fb642b92 N |
4617 | spin_lock_irq(&head_sh->stripe_lock); |
4618 | head_sh->batch_head = NULL; | |
4619 | spin_unlock_irq(&head_sh->stripe_lock); | |
4620 | for (i = 0; i < head_sh->disks; i++) | |
4621 | if (test_and_clear_bit(R5_Overlap, &head_sh->dev[i].flags)) | |
4622 | do_wakeup = 1; | |
3960ce79 N |
4623 | if (head_sh->state & handle_flags) |
4624 | set_bit(STRIPE_HANDLE, &head_sh->state); | |
fb642b92 N |
4625 | |
4626 | if (do_wakeup) | |
4627 | wake_up(&head_sh->raid_conf->wait_for_overlap); | |
72ac7330 | 4628 | } |
4629 | ||
cc94015a N |
4630 | static void handle_stripe(struct stripe_head *sh) |
4631 | { | |
4632 | struct stripe_head_state s; | |
d1688a6d | 4633 | struct r5conf *conf = sh->raid_conf; |
3687c061 | 4634 | int i; |
84789554 N |
4635 | int prexor; |
4636 | int disks = sh->disks; | |
474af965 | 4637 | struct r5dev *pdev, *qdev; |
cc94015a N |
4638 | |
4639 | clear_bit(STRIPE_HANDLE, &sh->state); | |
257a4b42 | 4640 | if (test_and_set_bit_lock(STRIPE_ACTIVE, &sh->state)) { |
cc94015a N |
4641 | /* already being handled, ensure it gets handled |
4642 | * again when current action finishes */ | |
4643 | set_bit(STRIPE_HANDLE, &sh->state); | |
4644 | return; | |
4645 | } | |
4646 | ||
59fc630b | 4647 | if (clear_batch_ready(sh) ) { |
4648 | clear_bit_unlock(STRIPE_ACTIVE, &sh->state); | |
4649 | return; | |
4650 | } | |
4651 | ||
4e3d62ff | 4652 | if (test_and_clear_bit(STRIPE_BATCH_ERR, &sh->state)) |
3960ce79 | 4653 | break_stripe_batch_list(sh, 0); |
72ac7330 | 4654 | |
dabc4ec6 | 4655 | if (test_bit(STRIPE_SYNC_REQUESTED, &sh->state) && !sh->batch_head) { |
f8dfcffd N |
4656 | spin_lock(&sh->stripe_lock); |
4657 | /* Cannot process 'sync' concurrently with 'discard' */ | |
4658 | if (!test_bit(STRIPE_DISCARD, &sh->state) && | |
4659 | test_and_clear_bit(STRIPE_SYNC_REQUESTED, &sh->state)) { | |
4660 | set_bit(STRIPE_SYNCING, &sh->state); | |
4661 | clear_bit(STRIPE_INSYNC, &sh->state); | |
f94c0b66 | 4662 | clear_bit(STRIPE_REPLACED, &sh->state); |
f8dfcffd N |
4663 | } |
4664 | spin_unlock(&sh->stripe_lock); | |
cc94015a N |
4665 | } |
4666 | clear_bit(STRIPE_DELAYED, &sh->state); | |
4667 | ||
4668 | pr_debug("handling stripe %llu, state=%#lx cnt=%d, " | |
4669 | "pd_idx=%d, qd_idx=%d\n, check:%d, reconstruct:%d\n", | |
4670 | (unsigned long long)sh->sector, sh->state, | |
4671 | atomic_read(&sh->count), sh->pd_idx, sh->qd_idx, | |
4672 | sh->check_state, sh->reconstruct_state); | |
3687c061 | 4673 | |
acfe726b | 4674 | analyse_stripe(sh, &s); |
c5a31000 | 4675 | |
b70abcb2 SL |
4676 | if (test_bit(STRIPE_LOG_TRAPPED, &sh->state)) |
4677 | goto finish; | |
4678 | ||
16d997b7 N |
4679 | if (s.handle_bad_blocks || |
4680 | test_bit(MD_SB_CHANGE_PENDING, &conf->mddev->sb_flags)) { | |
bc2607f3 N |
4681 | set_bit(STRIPE_HANDLE, &sh->state); |
4682 | goto finish; | |
4683 | } | |
4684 | ||
474af965 N |
4685 | if (unlikely(s.blocked_rdev)) { |
4686 | if (s.syncing || s.expanding || s.expanded || | |
9a3e1101 | 4687 | s.replacing || s.to_write || s.written) { |
474af965 N |
4688 | set_bit(STRIPE_HANDLE, &sh->state); |
4689 | goto finish; | |
4690 | } | |
4691 | /* There is nothing for the blocked_rdev to block */ | |
4692 | rdev_dec_pending(s.blocked_rdev, conf->mddev); | |
4693 | s.blocked_rdev = NULL; | |
4694 | } | |
4695 | ||
4696 | if (s.to_fill && !test_bit(STRIPE_BIOFILL_RUN, &sh->state)) { | |
4697 | set_bit(STRIPE_OP_BIOFILL, &s.ops_request); | |
4698 | set_bit(STRIPE_BIOFILL_RUN, &sh->state); | |
4699 | } | |
4700 | ||
4701 | pr_debug("locked=%d uptodate=%d to_read=%d" | |
4702 | " to_write=%d failed=%d failed_num=%d,%d\n", | |
4703 | s.locked, s.uptodate, s.to_read, s.to_write, s.failed, | |
4704 | s.failed_num[0], s.failed_num[1]); | |
4705 | /* check if the array has lost more than max_degraded devices and, | |
4706 | * if so, some requests might need to be failed. | |
4707 | */ | |
6e74a9cf | 4708 | if (s.failed > conf->max_degraded || s.log_failed) { |
9a3f530f N |
4709 | sh->check_state = 0; |
4710 | sh->reconstruct_state = 0; | |
626f2092 | 4711 | break_stripe_batch_list(sh, 0); |
9a3f530f | 4712 | if (s.to_read+s.to_write+s.written) |
bd83d0a2 | 4713 | handle_failed_stripe(conf, sh, &s, disks); |
9a3e1101 | 4714 | if (s.syncing + s.replacing) |
9a3f530f N |
4715 | handle_failed_sync(conf, sh, &s); |
4716 | } | |
474af965 | 4717 | |
84789554 N |
4718 | /* Now we check to see if any write operations have recently |
4719 | * completed | |
4720 | */ | |
4721 | prexor = 0; | |
4722 | if (sh->reconstruct_state == reconstruct_state_prexor_drain_result) | |
4723 | prexor = 1; | |
4724 | if (sh->reconstruct_state == reconstruct_state_drain_result || | |
4725 | sh->reconstruct_state == reconstruct_state_prexor_drain_result) { | |
4726 | sh->reconstruct_state = reconstruct_state_idle; | |
4727 | ||
4728 | /* All the 'written' buffers and the parity block are ready to | |
4729 | * be written back to disk | |
4730 | */ | |
9e444768 SL |
4731 | BUG_ON(!test_bit(R5_UPTODATE, &sh->dev[sh->pd_idx].flags) && |
4732 | !test_bit(R5_Discard, &sh->dev[sh->pd_idx].flags)); | |
84789554 | 4733 | BUG_ON(sh->qd_idx >= 0 && |
9e444768 SL |
4734 | !test_bit(R5_UPTODATE, &sh->dev[sh->qd_idx].flags) && |
4735 | !test_bit(R5_Discard, &sh->dev[sh->qd_idx].flags)); | |
84789554 N |
4736 | for (i = disks; i--; ) { |
4737 | struct r5dev *dev = &sh->dev[i]; | |
4738 | if (test_bit(R5_LOCKED, &dev->flags) && | |
4739 | (i == sh->pd_idx || i == sh->qd_idx || | |
1e6d690b SL |
4740 | dev->written || test_bit(R5_InJournal, |
4741 | &dev->flags))) { | |
84789554 N |
4742 | pr_debug("Writing block %d\n", i); |
4743 | set_bit(R5_Wantwrite, &dev->flags); | |
4744 | if (prexor) | |
4745 | continue; | |
9c4bdf69 N |
4746 | if (s.failed > 1) |
4747 | continue; | |
84789554 N |
4748 | if (!test_bit(R5_Insync, &dev->flags) || |
4749 | ((i == sh->pd_idx || i == sh->qd_idx) && | |
4750 | s.failed == 0)) | |
4751 | set_bit(STRIPE_INSYNC, &sh->state); | |
4752 | } | |
4753 | } | |
4754 | if (test_and_clear_bit(STRIPE_PREREAD_ACTIVE, &sh->state)) | |
4755 | s.dec_preread_active = 1; | |
4756 | } | |
4757 | ||
ef5b7c69 N |
4758 | /* |
4759 | * might be able to return some write requests if the parity blocks | |
4760 | * are safe, or on a failed drive | |
4761 | */ | |
4762 | pdev = &sh->dev[sh->pd_idx]; | |
4763 | s.p_failed = (s.failed >= 1 && s.failed_num[0] == sh->pd_idx) | |
4764 | || (s.failed >= 2 && s.failed_num[1] == sh->pd_idx); | |
4765 | qdev = &sh->dev[sh->qd_idx]; | |
4766 | s.q_failed = (s.failed >= 1 && s.failed_num[0] == sh->qd_idx) | |
4767 | || (s.failed >= 2 && s.failed_num[1] == sh->qd_idx) | |
4768 | || conf->level < 6; | |
4769 | ||
4770 | if (s.written && | |
4771 | (s.p_failed || ((test_bit(R5_Insync, &pdev->flags) | |
4772 | && !test_bit(R5_LOCKED, &pdev->flags) | |
4773 | && (test_bit(R5_UPTODATE, &pdev->flags) || | |
4774 | test_bit(R5_Discard, &pdev->flags))))) && | |
4775 | (s.q_failed || ((test_bit(R5_Insync, &qdev->flags) | |
4776 | && !test_bit(R5_LOCKED, &qdev->flags) | |
4777 | && (test_bit(R5_UPTODATE, &qdev->flags) || | |
4778 | test_bit(R5_Discard, &qdev->flags)))))) | |
bd83d0a2 | 4779 | handle_stripe_clean_event(conf, sh, disks); |
ef5b7c69 | 4780 | |
1e6d690b | 4781 | if (s.just_cached) |
bd83d0a2 | 4782 | r5c_handle_cached_data_endio(conf, sh, disks); |
ff875738 | 4783 | log_stripe_write_finished(sh); |
1e6d690b | 4784 | |
ef5b7c69 N |
4785 | /* Now we might consider reading some blocks, either to check/generate |
4786 | * parity, or to satisfy requests | |
4787 | * or to load a block that is being partially written. | |
4788 | */ | |
4789 | if (s.to_read || s.non_overwrite | |
4790 | || (conf->level == 6 && s.to_write && s.failed) | |
4791 | || (s.syncing && (s.uptodate + s.compute < disks)) | |
4792 | || s.replacing | |
4793 | || s.expanding) | |
4794 | handle_stripe_fill(sh, &s, disks); | |
4795 | ||
2ded3703 SL |
4796 | /* |
4797 | * When the stripe finishes full journal write cycle (write to journal | |
4798 | * and raid disk), this is the clean up procedure so it is ready for | |
4799 | * next operation. | |
4800 | */ | |
4801 | r5c_finish_stripe_write_out(conf, sh, &s); | |
4802 | ||
4803 | /* | |
4804 | * Now to consider new write requests, cache write back and what else, | |
4805 | * if anything should be read. We do not handle new writes when: | |
84789554 N |
4806 | * 1/ A 'write' operation (copy+xor) is already in flight. |
4807 | * 2/ A 'check' operation is in flight, as it may clobber the parity | |
4808 | * block. | |
2ded3703 | 4809 | * 3/ A r5c cache log write is in flight. |
84789554 | 4810 | */ |
2ded3703 SL |
4811 | |
4812 | if (!sh->reconstruct_state && !sh->check_state && !sh->log_io) { | |
4813 | if (!r5c_is_writeback(conf->log)) { | |
4814 | if (s.to_write) | |
4815 | handle_stripe_dirtying(conf, sh, &s, disks); | |
4816 | } else { /* write back cache */ | |
4817 | int ret = 0; | |
4818 | ||
4819 | /* First, try handle writes in caching phase */ | |
4820 | if (s.to_write) | |
4821 | ret = r5c_try_caching_write(conf, sh, &s, | |
4822 | disks); | |
4823 | /* | |
4824 | * If caching phase failed: ret == -EAGAIN | |
4825 | * OR | |
4826 | * stripe under reclaim: !caching && injournal | |
4827 | * | |
4828 | * fall back to handle_stripe_dirtying() | |
4829 | */ | |
4830 | if (ret == -EAGAIN || | |
4831 | /* stripe under reclaim: !caching && injournal */ | |
4832 | (!test_bit(STRIPE_R5C_CACHING, &sh->state) && | |
d7bd398e SL |
4833 | s.injournal > 0)) { |
4834 | ret = handle_stripe_dirtying(conf, sh, &s, | |
4835 | disks); | |
4836 | if (ret == -EAGAIN) | |
4837 | goto finish; | |
4838 | } | |
2ded3703 SL |
4839 | } |
4840 | } | |
84789554 N |
4841 | |
4842 | /* maybe we need to check and possibly fix the parity for this stripe | |
4843 | * Any reads will already have been scheduled, so we just see if enough | |
4844 | * data is available. The parity check is held off while parity | |
4845 | * dependent operations are in flight. | |
4846 | */ | |
4847 | if (sh->check_state || | |
4848 | (s.syncing && s.locked == 0 && | |
4849 | !test_bit(STRIPE_COMPUTE_RUN, &sh->state) && | |
4850 | !test_bit(STRIPE_INSYNC, &sh->state))) { | |
4851 | if (conf->level == 6) | |
4852 | handle_parity_checks6(conf, sh, &s, disks); | |
4853 | else | |
4854 | handle_parity_checks5(conf, sh, &s, disks); | |
4855 | } | |
c5a31000 | 4856 | |
f94c0b66 N |
4857 | if ((s.replacing || s.syncing) && s.locked == 0 |
4858 | && !test_bit(STRIPE_COMPUTE_RUN, &sh->state) | |
4859 | && !test_bit(STRIPE_REPLACED, &sh->state)) { | |
9a3e1101 N |
4860 | /* Write out to replacement devices where possible */ |
4861 | for (i = 0; i < conf->raid_disks; i++) | |
f94c0b66 N |
4862 | if (test_bit(R5_NeedReplace, &sh->dev[i].flags)) { |
4863 | WARN_ON(!test_bit(R5_UPTODATE, &sh->dev[i].flags)); | |
9a3e1101 N |
4864 | set_bit(R5_WantReplace, &sh->dev[i].flags); |
4865 | set_bit(R5_LOCKED, &sh->dev[i].flags); | |
4866 | s.locked++; | |
4867 | } | |
f94c0b66 N |
4868 | if (s.replacing) |
4869 | set_bit(STRIPE_INSYNC, &sh->state); | |
4870 | set_bit(STRIPE_REPLACED, &sh->state); | |
9a3e1101 N |
4871 | } |
4872 | if ((s.syncing || s.replacing) && s.locked == 0 && | |
f94c0b66 | 4873 | !test_bit(STRIPE_COMPUTE_RUN, &sh->state) && |
9a3e1101 | 4874 | test_bit(STRIPE_INSYNC, &sh->state)) { |
c5a31000 N |
4875 | md_done_sync(conf->mddev, STRIPE_SECTORS, 1); |
4876 | clear_bit(STRIPE_SYNCING, &sh->state); | |
f8dfcffd N |
4877 | if (test_and_clear_bit(R5_Overlap, &sh->dev[sh->pd_idx].flags)) |
4878 | wake_up(&conf->wait_for_overlap); | |
c5a31000 N |
4879 | } |
4880 | ||
4881 | /* If the failed drives are just a ReadError, then we might need | |
4882 | * to progress the repair/check process | |
4883 | */ | |
4884 | if (s.failed <= conf->max_degraded && !conf->mddev->ro) | |
4885 | for (i = 0; i < s.failed; i++) { | |
4886 | struct r5dev *dev = &sh->dev[s.failed_num[i]]; | |
4887 | if (test_bit(R5_ReadError, &dev->flags) | |
4888 | && !test_bit(R5_LOCKED, &dev->flags) | |
4889 | && test_bit(R5_UPTODATE, &dev->flags) | |
4890 | ) { | |
4891 | if (!test_bit(R5_ReWrite, &dev->flags)) { | |
4892 | set_bit(R5_Wantwrite, &dev->flags); | |
4893 | set_bit(R5_ReWrite, &dev->flags); | |
4894 | set_bit(R5_LOCKED, &dev->flags); | |
4895 | s.locked++; | |
4896 | } else { | |
4897 | /* let's read it back */ | |
4898 | set_bit(R5_Wantread, &dev->flags); | |
4899 | set_bit(R5_LOCKED, &dev->flags); | |
4900 | s.locked++; | |
4901 | } | |
4902 | } | |
4903 | } | |
4904 | ||
3687c061 N |
4905 | /* Finish reconstruct operations initiated by the expansion process */ |
4906 | if (sh->reconstruct_state == reconstruct_state_result) { | |
4907 | struct stripe_head *sh_src | |
6d036f7d | 4908 | = raid5_get_active_stripe(conf, sh->sector, 1, 1, 1); |
3687c061 N |
4909 | if (sh_src && test_bit(STRIPE_EXPAND_SOURCE, &sh_src->state)) { |
4910 | /* sh cannot be written until sh_src has been read. | |
4911 | * so arrange for sh to be delayed a little | |
4912 | */ | |
4913 | set_bit(STRIPE_DELAYED, &sh->state); | |
4914 | set_bit(STRIPE_HANDLE, &sh->state); | |
4915 | if (!test_and_set_bit(STRIPE_PREREAD_ACTIVE, | |
4916 | &sh_src->state)) | |
4917 | atomic_inc(&conf->preread_active_stripes); | |
6d036f7d | 4918 | raid5_release_stripe(sh_src); |
3687c061 N |
4919 | goto finish; |
4920 | } | |
4921 | if (sh_src) | |
6d036f7d | 4922 | raid5_release_stripe(sh_src); |
3687c061 N |
4923 | |
4924 | sh->reconstruct_state = reconstruct_state_idle; | |
4925 | clear_bit(STRIPE_EXPANDING, &sh->state); | |
4926 | for (i = conf->raid_disks; i--; ) { | |
4927 | set_bit(R5_Wantwrite, &sh->dev[i].flags); | |
4928 | set_bit(R5_LOCKED, &sh->dev[i].flags); | |
4929 | s.locked++; | |
4930 | } | |
4931 | } | |
f416885e | 4932 | |
3687c061 N |
4933 | if (s.expanded && test_bit(STRIPE_EXPANDING, &sh->state) && |
4934 | !sh->reconstruct_state) { | |
4935 | /* Need to write out all blocks after computing parity */ | |
4936 | sh->disks = conf->raid_disks; | |
4937 | stripe_set_idx(sh->sector, conf, 0, sh); | |
4938 | schedule_reconstruction(sh, &s, 1, 1); | |
4939 | } else if (s.expanded && !sh->reconstruct_state && s.locked == 0) { | |
4940 | clear_bit(STRIPE_EXPAND_READY, &sh->state); | |
4941 | atomic_dec(&conf->reshape_stripes); | |
4942 | wake_up(&conf->wait_for_overlap); | |
4943 | md_done_sync(conf->mddev, STRIPE_SECTORS, 1); | |
4944 | } | |
4945 | ||
4946 | if (s.expanding && s.locked == 0 && | |
4947 | !test_bit(STRIPE_COMPUTE_RUN, &sh->state)) | |
4948 | handle_stripe_expansion(conf, sh); | |
16a53ecc | 4949 | |
3687c061 | 4950 | finish: |
6bfe0b49 | 4951 | /* wait for this device to become unblocked */ |
5f066c63 N |
4952 | if (unlikely(s.blocked_rdev)) { |
4953 | if (conf->mddev->external) | |
4954 | md_wait_for_blocked_rdev(s.blocked_rdev, | |
4955 | conf->mddev); | |
4956 | else | |
4957 | /* Internal metadata will immediately | |
4958 | * be written by raid5d, so we don't | |
4959 | * need to wait here. | |
4960 | */ | |
4961 | rdev_dec_pending(s.blocked_rdev, | |
4962 | conf->mddev); | |
4963 | } | |
6bfe0b49 | 4964 | |
bc2607f3 N |
4965 | if (s.handle_bad_blocks) |
4966 | for (i = disks; i--; ) { | |
3cb03002 | 4967 | struct md_rdev *rdev; |
bc2607f3 N |
4968 | struct r5dev *dev = &sh->dev[i]; |
4969 | if (test_and_clear_bit(R5_WriteError, &dev->flags)) { | |
4970 | /* We own a safe reference to the rdev */ | |
4971 | rdev = conf->disks[i].rdev; | |
4972 | if (!rdev_set_badblocks(rdev, sh->sector, | |
4973 | STRIPE_SECTORS, 0)) | |
4974 | md_error(conf->mddev, rdev); | |
4975 | rdev_dec_pending(rdev, conf->mddev); | |
4976 | } | |
b84db560 N |
4977 | if (test_and_clear_bit(R5_MadeGood, &dev->flags)) { |
4978 | rdev = conf->disks[i].rdev; | |
4979 | rdev_clear_badblocks(rdev, sh->sector, | |
c6563a8c | 4980 | STRIPE_SECTORS, 0); |
b84db560 N |
4981 | rdev_dec_pending(rdev, conf->mddev); |
4982 | } | |
977df362 N |
4983 | if (test_and_clear_bit(R5_MadeGoodRepl, &dev->flags)) { |
4984 | rdev = conf->disks[i].replacement; | |
dd054fce N |
4985 | if (!rdev) |
4986 | /* rdev have been moved down */ | |
4987 | rdev = conf->disks[i].rdev; | |
977df362 | 4988 | rdev_clear_badblocks(rdev, sh->sector, |
c6563a8c | 4989 | STRIPE_SECTORS, 0); |
977df362 N |
4990 | rdev_dec_pending(rdev, conf->mddev); |
4991 | } | |
bc2607f3 N |
4992 | } |
4993 | ||
6c0069c0 YT |
4994 | if (s.ops_request) |
4995 | raid_run_ops(sh, s.ops_request); | |
4996 | ||
f0e43bcd | 4997 | ops_run_io(sh, &s); |
16a53ecc | 4998 | |
c5709ef6 | 4999 | if (s.dec_preread_active) { |
729a1866 | 5000 | /* We delay this until after ops_run_io so that if make_request |
e9c7469b | 5001 | * is waiting on a flush, it won't continue until the writes |
729a1866 N |
5002 | * have actually been submitted. |
5003 | */ | |
5004 | atomic_dec(&conf->preread_active_stripes); | |
5005 | if (atomic_read(&conf->preread_active_stripes) < | |
5006 | IO_THRESHOLD) | |
5007 | md_wakeup_thread(conf->mddev->thread); | |
5008 | } | |
5009 | ||
257a4b42 | 5010 | clear_bit_unlock(STRIPE_ACTIVE, &sh->state); |
16a53ecc N |
5011 | } |
5012 | ||
d1688a6d | 5013 | static void raid5_activate_delayed(struct r5conf *conf) |
16a53ecc N |
5014 | { |
5015 | if (atomic_read(&conf->preread_active_stripes) < IO_THRESHOLD) { | |
5016 | while (!list_empty(&conf->delayed_list)) { | |
5017 | struct list_head *l = conf->delayed_list.next; | |
5018 | struct stripe_head *sh; | |
5019 | sh = list_entry(l, struct stripe_head, lru); | |
5020 | list_del_init(l); | |
5021 | clear_bit(STRIPE_DELAYED, &sh->state); | |
5022 | if (!test_and_set_bit(STRIPE_PREREAD_ACTIVE, &sh->state)) | |
5023 | atomic_inc(&conf->preread_active_stripes); | |
8b3e6cdc | 5024 | list_add_tail(&sh->lru, &conf->hold_list); |
851c30c9 | 5025 | raid5_wakeup_stripe_thread(sh); |
16a53ecc | 5026 | } |
482c0834 | 5027 | } |
16a53ecc N |
5028 | } |
5029 | ||
566c09c5 SL |
5030 | static void activate_bit_delay(struct r5conf *conf, |
5031 | struct list_head *temp_inactive_list) | |
16a53ecc N |
5032 | { |
5033 | /* device_lock is held */ | |
5034 | struct list_head head; | |
5035 | list_add(&head, &conf->bitmap_list); | |
5036 | list_del_init(&conf->bitmap_list); | |
5037 | while (!list_empty(&head)) { | |
5038 | struct stripe_head *sh = list_entry(head.next, struct stripe_head, lru); | |
566c09c5 | 5039 | int hash; |
16a53ecc N |
5040 | list_del_init(&sh->lru); |
5041 | atomic_inc(&sh->count); | |
566c09c5 SL |
5042 | hash = sh->hash_lock_index; |
5043 | __release_stripe(conf, sh, &temp_inactive_list[hash]); | |
16a53ecc N |
5044 | } |
5045 | } | |
5046 | ||
5c675f83 | 5047 | static int raid5_congested(struct mddev *mddev, int bits) |
f022b2fd | 5048 | { |
d1688a6d | 5049 | struct r5conf *conf = mddev->private; |
f022b2fd N |
5050 | |
5051 | /* No difference between reads and writes. Just check | |
5052 | * how busy the stripe_cache is | |
5053 | */ | |
3fa841d7 | 5054 | |
5423399a | 5055 | if (test_bit(R5_INACTIVE_BLOCKED, &conf->cache_state)) |
f022b2fd | 5056 | return 1; |
a39f7afd SL |
5057 | |
5058 | /* Also checks whether there is pressure on r5cache log space */ | |
5059 | if (test_bit(R5C_LOG_TIGHT, &conf->cache_state)) | |
5060 | return 1; | |
f022b2fd N |
5061 | if (conf->quiesce) |
5062 | return 1; | |
4bda556a | 5063 | if (atomic_read(&conf->empty_inactive_list_nr)) |
f022b2fd N |
5064 | return 1; |
5065 | ||
5066 | return 0; | |
5067 | } | |
5068 | ||
fd01b88c | 5069 | static int in_chunk_boundary(struct mddev *mddev, struct bio *bio) |
f679623f | 5070 | { |
3cb5edf4 | 5071 | struct r5conf *conf = mddev->private; |
4f024f37 | 5072 | sector_t sector = bio->bi_iter.bi_sector + get_start_sect(bio->bi_bdev); |
3cb5edf4 | 5073 | unsigned int chunk_sectors; |
aa8b57aa | 5074 | unsigned int bio_sectors = bio_sectors(bio); |
f679623f | 5075 | |
3cb5edf4 | 5076 | chunk_sectors = min(conf->chunk_sectors, conf->prev_chunk_sectors); |
f679623f RBJ |
5077 | return chunk_sectors >= |
5078 | ((sector & (chunk_sectors - 1)) + bio_sectors); | |
5079 | } | |
5080 | ||
46031f9a RBJ |
5081 | /* |
5082 | * add bio to the retry LIFO ( in O(1) ... we are in interrupt ) | |
5083 | * later sampled by raid5d. | |
5084 | */ | |
d1688a6d | 5085 | static void add_bio_to_retry(struct bio *bi,struct r5conf *conf) |
46031f9a RBJ |
5086 | { |
5087 | unsigned long flags; | |
5088 | ||
5089 | spin_lock_irqsave(&conf->device_lock, flags); | |
5090 | ||
5091 | bi->bi_next = conf->retry_read_aligned_list; | |
5092 | conf->retry_read_aligned_list = bi; | |
5093 | ||
5094 | spin_unlock_irqrestore(&conf->device_lock, flags); | |
5095 | md_wakeup_thread(conf->mddev->thread); | |
5096 | } | |
5097 | ||
d1688a6d | 5098 | static struct bio *remove_bio_from_retry(struct r5conf *conf) |
46031f9a RBJ |
5099 | { |
5100 | struct bio *bi; | |
5101 | ||
5102 | bi = conf->retry_read_aligned; | |
5103 | if (bi) { | |
5104 | conf->retry_read_aligned = NULL; | |
5105 | return bi; | |
5106 | } | |
5107 | bi = conf->retry_read_aligned_list; | |
5108 | if(bi) { | |
387bb173 | 5109 | conf->retry_read_aligned_list = bi->bi_next; |
46031f9a | 5110 | bi->bi_next = NULL; |
960e739d JA |
5111 | /* |
5112 | * this sets the active strip count to 1 and the processed | |
5113 | * strip count to zero (upper 8 bits) | |
5114 | */ | |
e7836bd6 | 5115 | raid5_set_bi_stripes(bi, 1); /* biased count of active stripes */ |
46031f9a RBJ |
5116 | } |
5117 | ||
5118 | return bi; | |
5119 | } | |
5120 | ||
f679623f RBJ |
5121 | /* |
5122 | * The "raid5_align_endio" should check if the read succeeded and if it | |
5123 | * did, call bio_endio on the original bio (having bio_put the new bio | |
5124 | * first). | |
5125 | * If the read failed.. | |
5126 | */ | |
4246a0b6 | 5127 | static void raid5_align_endio(struct bio *bi) |
f679623f RBJ |
5128 | { |
5129 | struct bio* raid_bi = bi->bi_private; | |
fd01b88c | 5130 | struct mddev *mddev; |
d1688a6d | 5131 | struct r5conf *conf; |
3cb03002 | 5132 | struct md_rdev *rdev; |
9b81c842 | 5133 | int error = bi->bi_error; |
46031f9a | 5134 | |
f679623f | 5135 | bio_put(bi); |
46031f9a | 5136 | |
46031f9a RBJ |
5137 | rdev = (void*)raid_bi->bi_next; |
5138 | raid_bi->bi_next = NULL; | |
2b7f2228 N |
5139 | mddev = rdev->mddev; |
5140 | conf = mddev->private; | |
46031f9a RBJ |
5141 | |
5142 | rdev_dec_pending(rdev, conf->mddev); | |
5143 | ||
9b81c842 | 5144 | if (!error) { |
0a82a8d1 LT |
5145 | trace_block_bio_complete(bdev_get_queue(raid_bi->bi_bdev), |
5146 | raid_bi, 0); | |
4246a0b6 | 5147 | bio_endio(raid_bi); |
46031f9a | 5148 | if (atomic_dec_and_test(&conf->active_aligned_reads)) |
b1b46486 | 5149 | wake_up(&conf->wait_for_quiescent); |
6712ecf8 | 5150 | return; |
46031f9a RBJ |
5151 | } |
5152 | ||
45b4233c | 5153 | pr_debug("raid5_align_endio : io error...handing IO for a retry\n"); |
46031f9a RBJ |
5154 | |
5155 | add_bio_to_retry(raid_bi, conf); | |
f679623f RBJ |
5156 | } |
5157 | ||
7ef6b12a | 5158 | static int raid5_read_one_chunk(struct mddev *mddev, struct bio *raid_bio) |
f679623f | 5159 | { |
d1688a6d | 5160 | struct r5conf *conf = mddev->private; |
8553fe7e | 5161 | int dd_idx; |
f679623f | 5162 | struct bio* align_bi; |
3cb03002 | 5163 | struct md_rdev *rdev; |
671488cc | 5164 | sector_t end_sector; |
f679623f RBJ |
5165 | |
5166 | if (!in_chunk_boundary(mddev, raid_bio)) { | |
7ef6b12a | 5167 | pr_debug("%s: non aligned\n", __func__); |
f679623f RBJ |
5168 | return 0; |
5169 | } | |
5170 | /* | |
d7a10308 | 5171 | * use bio_clone_fast to make a copy of the bio |
f679623f | 5172 | */ |
d7a10308 | 5173 | align_bi = bio_clone_fast(raid_bio, GFP_NOIO, mddev->bio_set); |
f679623f RBJ |
5174 | if (!align_bi) |
5175 | return 0; | |
5176 | /* | |
5177 | * set bi_end_io to a new function, and set bi_private to the | |
5178 | * original bio. | |
5179 | */ | |
5180 | align_bi->bi_end_io = raid5_align_endio; | |
5181 | align_bi->bi_private = raid_bio; | |
5182 | /* | |
5183 | * compute position | |
5184 | */ | |
4f024f37 KO |
5185 | align_bi->bi_iter.bi_sector = |
5186 | raid5_compute_sector(conf, raid_bio->bi_iter.bi_sector, | |
5187 | 0, &dd_idx, NULL); | |
f679623f | 5188 | |
f73a1c7d | 5189 | end_sector = bio_end_sector(align_bi); |
f679623f | 5190 | rcu_read_lock(); |
671488cc N |
5191 | rdev = rcu_dereference(conf->disks[dd_idx].replacement); |
5192 | if (!rdev || test_bit(Faulty, &rdev->flags) || | |
5193 | rdev->recovery_offset < end_sector) { | |
5194 | rdev = rcu_dereference(conf->disks[dd_idx].rdev); | |
5195 | if (rdev && | |
5196 | (test_bit(Faulty, &rdev->flags) || | |
5197 | !(test_bit(In_sync, &rdev->flags) || | |
5198 | rdev->recovery_offset >= end_sector))) | |
5199 | rdev = NULL; | |
5200 | } | |
03b047f4 SL |
5201 | |
5202 | if (r5c_big_stripe_cached(conf, align_bi->bi_iter.bi_sector)) { | |
5203 | rcu_read_unlock(); | |
5204 | bio_put(align_bi); | |
5205 | return 0; | |
5206 | } | |
5207 | ||
671488cc | 5208 | if (rdev) { |
31c176ec N |
5209 | sector_t first_bad; |
5210 | int bad_sectors; | |
5211 | ||
f679623f RBJ |
5212 | atomic_inc(&rdev->nr_pending); |
5213 | rcu_read_unlock(); | |
46031f9a RBJ |
5214 | raid_bio->bi_next = (void*)rdev; |
5215 | align_bi->bi_bdev = rdev->bdev; | |
b7c44ed9 | 5216 | bio_clear_flag(align_bi, BIO_SEG_VALID); |
46031f9a | 5217 | |
7140aafc | 5218 | if (is_badblock(rdev, align_bi->bi_iter.bi_sector, |
4f024f37 | 5219 | bio_sectors(align_bi), |
31c176ec | 5220 | &first_bad, &bad_sectors)) { |
387bb173 NB |
5221 | bio_put(align_bi); |
5222 | rdev_dec_pending(rdev, mddev); | |
5223 | return 0; | |
5224 | } | |
5225 | ||
6c0544e2 | 5226 | /* No reshape active, so we can trust rdev->data_offset */ |
4f024f37 | 5227 | align_bi->bi_iter.bi_sector += rdev->data_offset; |
6c0544e2 | 5228 | |
46031f9a | 5229 | spin_lock_irq(&conf->device_lock); |
b1b46486 | 5230 | wait_event_lock_irq(conf->wait_for_quiescent, |
46031f9a | 5231 | conf->quiesce == 0, |
eed8c02e | 5232 | conf->device_lock); |
46031f9a RBJ |
5233 | atomic_inc(&conf->active_aligned_reads); |
5234 | spin_unlock_irq(&conf->device_lock); | |
5235 | ||
e3620a3a JB |
5236 | if (mddev->gendisk) |
5237 | trace_block_bio_remap(bdev_get_queue(align_bi->bi_bdev), | |
5238 | align_bi, disk_devt(mddev->gendisk), | |
4f024f37 | 5239 | raid_bio->bi_iter.bi_sector); |
f679623f RBJ |
5240 | generic_make_request(align_bi); |
5241 | return 1; | |
5242 | } else { | |
5243 | rcu_read_unlock(); | |
46031f9a | 5244 | bio_put(align_bi); |
f679623f RBJ |
5245 | return 0; |
5246 | } | |
5247 | } | |
5248 | ||
7ef6b12a ML |
5249 | static struct bio *chunk_aligned_read(struct mddev *mddev, struct bio *raid_bio) |
5250 | { | |
5251 | struct bio *split; | |
5252 | ||
5253 | do { | |
5254 | sector_t sector = raid_bio->bi_iter.bi_sector; | |
5255 | unsigned chunk_sects = mddev->chunk_sectors; | |
5256 | unsigned sectors = chunk_sects - (sector & (chunk_sects-1)); | |
5257 | ||
5258 | if (sectors < bio_sectors(raid_bio)) { | |
5259 | split = bio_split(raid_bio, sectors, GFP_NOIO, fs_bio_set); | |
5260 | bio_chain(split, raid_bio); | |
5261 | } else | |
5262 | split = raid_bio; | |
5263 | ||
5264 | if (!raid5_read_one_chunk(mddev, split)) { | |
5265 | if (split != raid_bio) | |
5266 | generic_make_request(raid_bio); | |
5267 | return split; | |
5268 | } | |
5269 | } while (split != raid_bio); | |
5270 | ||
5271 | return NULL; | |
5272 | } | |
5273 | ||
8b3e6cdc DW |
5274 | /* __get_priority_stripe - get the next stripe to process |
5275 | * | |
5276 | * Full stripe writes are allowed to pass preread active stripes up until | |
5277 | * the bypass_threshold is exceeded. In general the bypass_count | |
5278 | * increments when the handle_list is handled before the hold_list; however, it | |
5279 | * will not be incremented when STRIPE_IO_STARTED is sampled set signifying a | |
5280 | * stripe with in flight i/o. The bypass_count will be reset when the | |
5281 | * head of the hold_list has changed, i.e. the head was promoted to the | |
5282 | * handle_list. | |
5283 | */ | |
851c30c9 | 5284 | static struct stripe_head *__get_priority_stripe(struct r5conf *conf, int group) |
8b3e6cdc | 5285 | { |
535ae4eb | 5286 | struct stripe_head *sh, *tmp; |
851c30c9 | 5287 | struct list_head *handle_list = NULL; |
535ae4eb SL |
5288 | struct r5worker_group *wg; |
5289 | bool second_try = !r5c_is_writeback(conf->log); | |
5290 | bool try_loprio = test_bit(R5C_LOG_TIGHT, &conf->cache_state); | |
851c30c9 | 5291 | |
535ae4eb SL |
5292 | again: |
5293 | wg = NULL; | |
5294 | sh = NULL; | |
851c30c9 | 5295 | if (conf->worker_cnt_per_group == 0) { |
535ae4eb SL |
5296 | handle_list = try_loprio ? &conf->loprio_list : |
5297 | &conf->handle_list; | |
851c30c9 | 5298 | } else if (group != ANY_GROUP) { |
535ae4eb SL |
5299 | handle_list = try_loprio ? &conf->worker_groups[group].loprio_list : |
5300 | &conf->worker_groups[group].handle_list; | |
bfc90cb0 | 5301 | wg = &conf->worker_groups[group]; |
851c30c9 SL |
5302 | } else { |
5303 | int i; | |
5304 | for (i = 0; i < conf->group_cnt; i++) { | |
535ae4eb SL |
5305 | handle_list = try_loprio ? &conf->worker_groups[i].loprio_list : |
5306 | &conf->worker_groups[i].handle_list; | |
bfc90cb0 | 5307 | wg = &conf->worker_groups[i]; |
851c30c9 SL |
5308 | if (!list_empty(handle_list)) |
5309 | break; | |
5310 | } | |
5311 | } | |
8b3e6cdc DW |
5312 | |
5313 | pr_debug("%s: handle: %s hold: %s full_writes: %d bypass_count: %d\n", | |
5314 | __func__, | |
851c30c9 | 5315 | list_empty(handle_list) ? "empty" : "busy", |
8b3e6cdc DW |
5316 | list_empty(&conf->hold_list) ? "empty" : "busy", |
5317 | atomic_read(&conf->pending_full_writes), conf->bypass_count); | |
5318 | ||
851c30c9 SL |
5319 | if (!list_empty(handle_list)) { |
5320 | sh = list_entry(handle_list->next, typeof(*sh), lru); | |
8b3e6cdc DW |
5321 | |
5322 | if (list_empty(&conf->hold_list)) | |
5323 | conf->bypass_count = 0; | |
5324 | else if (!test_bit(STRIPE_IO_STARTED, &sh->state)) { | |
5325 | if (conf->hold_list.next == conf->last_hold) | |
5326 | conf->bypass_count++; | |
5327 | else { | |
5328 | conf->last_hold = conf->hold_list.next; | |
5329 | conf->bypass_count -= conf->bypass_threshold; | |
5330 | if (conf->bypass_count < 0) | |
5331 | conf->bypass_count = 0; | |
5332 | } | |
5333 | } | |
5334 | } else if (!list_empty(&conf->hold_list) && | |
5335 | ((conf->bypass_threshold && | |
5336 | conf->bypass_count > conf->bypass_threshold) || | |
5337 | atomic_read(&conf->pending_full_writes) == 0)) { | |
851c30c9 SL |
5338 | |
5339 | list_for_each_entry(tmp, &conf->hold_list, lru) { | |
5340 | if (conf->worker_cnt_per_group == 0 || | |
5341 | group == ANY_GROUP || | |
5342 | !cpu_online(tmp->cpu) || | |
5343 | cpu_to_group(tmp->cpu) == group) { | |
5344 | sh = tmp; | |
5345 | break; | |
5346 | } | |
5347 | } | |
5348 | ||
5349 | if (sh) { | |
5350 | conf->bypass_count -= conf->bypass_threshold; | |
5351 | if (conf->bypass_count < 0) | |
5352 | conf->bypass_count = 0; | |
5353 | } | |
bfc90cb0 | 5354 | wg = NULL; |
851c30c9 SL |
5355 | } |
5356 | ||
535ae4eb SL |
5357 | if (!sh) { |
5358 | if (second_try) | |
5359 | return NULL; | |
5360 | second_try = true; | |
5361 | try_loprio = !try_loprio; | |
5362 | goto again; | |
5363 | } | |
8b3e6cdc | 5364 | |
bfc90cb0 SL |
5365 | if (wg) { |
5366 | wg->stripes_cnt--; | |
5367 | sh->group = NULL; | |
5368 | } | |
8b3e6cdc | 5369 | list_del_init(&sh->lru); |
c7a6d35e | 5370 | BUG_ON(atomic_inc_return(&sh->count) != 1); |
8b3e6cdc DW |
5371 | return sh; |
5372 | } | |
f679623f | 5373 | |
8811b596 SL |
5374 | struct raid5_plug_cb { |
5375 | struct blk_plug_cb cb; | |
5376 | struct list_head list; | |
566c09c5 | 5377 | struct list_head temp_inactive_list[NR_STRIPE_HASH_LOCKS]; |
8811b596 SL |
5378 | }; |
5379 | ||
5380 | static void raid5_unplug(struct blk_plug_cb *blk_cb, bool from_schedule) | |
5381 | { | |
5382 | struct raid5_plug_cb *cb = container_of( | |
5383 | blk_cb, struct raid5_plug_cb, cb); | |
5384 | struct stripe_head *sh; | |
5385 | struct mddev *mddev = cb->cb.data; | |
5386 | struct r5conf *conf = mddev->private; | |
a9add5d9 | 5387 | int cnt = 0; |
566c09c5 | 5388 | int hash; |
8811b596 SL |
5389 | |
5390 | if (cb->list.next && !list_empty(&cb->list)) { | |
5391 | spin_lock_irq(&conf->device_lock); | |
5392 | while (!list_empty(&cb->list)) { | |
5393 | sh = list_first_entry(&cb->list, struct stripe_head, lru); | |
5394 | list_del_init(&sh->lru); | |
5395 | /* | |
5396 | * avoid race release_stripe_plug() sees | |
5397 | * STRIPE_ON_UNPLUG_LIST clear but the stripe | |
5398 | * is still in our list | |
5399 | */ | |
4e857c58 | 5400 | smp_mb__before_atomic(); |
8811b596 | 5401 | clear_bit(STRIPE_ON_UNPLUG_LIST, &sh->state); |
773ca82f SL |
5402 | /* |
5403 | * STRIPE_ON_RELEASE_LIST could be set here. In that | |
5404 | * case, the count is always > 1 here | |
5405 | */ | |
566c09c5 SL |
5406 | hash = sh->hash_lock_index; |
5407 | __release_stripe(conf, sh, &cb->temp_inactive_list[hash]); | |
a9add5d9 | 5408 | cnt++; |
8811b596 SL |
5409 | } |
5410 | spin_unlock_irq(&conf->device_lock); | |
5411 | } | |
566c09c5 SL |
5412 | release_inactive_stripe_list(conf, cb->temp_inactive_list, |
5413 | NR_STRIPE_HASH_LOCKS); | |
e3620a3a JB |
5414 | if (mddev->queue) |
5415 | trace_block_unplug(mddev->queue, cnt, !from_schedule); | |
8811b596 SL |
5416 | kfree(cb); |
5417 | } | |
5418 | ||
5419 | static void release_stripe_plug(struct mddev *mddev, | |
5420 | struct stripe_head *sh) | |
5421 | { | |
5422 | struct blk_plug_cb *blk_cb = blk_check_plugged( | |
5423 | raid5_unplug, mddev, | |
5424 | sizeof(struct raid5_plug_cb)); | |
5425 | struct raid5_plug_cb *cb; | |
5426 | ||
5427 | if (!blk_cb) { | |
6d036f7d | 5428 | raid5_release_stripe(sh); |
8811b596 SL |
5429 | return; |
5430 | } | |
5431 | ||
5432 | cb = container_of(blk_cb, struct raid5_plug_cb, cb); | |
5433 | ||
566c09c5 SL |
5434 | if (cb->list.next == NULL) { |
5435 | int i; | |
8811b596 | 5436 | INIT_LIST_HEAD(&cb->list); |
566c09c5 SL |
5437 | for (i = 0; i < NR_STRIPE_HASH_LOCKS; i++) |
5438 | INIT_LIST_HEAD(cb->temp_inactive_list + i); | |
5439 | } | |
8811b596 SL |
5440 | |
5441 | if (!test_and_set_bit(STRIPE_ON_UNPLUG_LIST, &sh->state)) | |
5442 | list_add_tail(&sh->lru, &cb->list); | |
5443 | else | |
6d036f7d | 5444 | raid5_release_stripe(sh); |
8811b596 SL |
5445 | } |
5446 | ||
620125f2 SL |
5447 | static void make_discard_request(struct mddev *mddev, struct bio *bi) |
5448 | { | |
5449 | struct r5conf *conf = mddev->private; | |
5450 | sector_t logical_sector, last_sector; | |
5451 | struct stripe_head *sh; | |
5452 | int remaining; | |
5453 | int stripe_sectors; | |
5454 | ||
5455 | if (mddev->reshape_position != MaxSector) | |
5456 | /* Skip discard while reshape is happening */ | |
5457 | return; | |
5458 | ||
4f024f37 KO |
5459 | logical_sector = bi->bi_iter.bi_sector & ~((sector_t)STRIPE_SECTORS-1); |
5460 | last_sector = bi->bi_iter.bi_sector + (bi->bi_iter.bi_size>>9); | |
620125f2 SL |
5461 | |
5462 | bi->bi_next = NULL; | |
5463 | bi->bi_phys_segments = 1; /* over-loaded to count active stripes */ | |
49728050 | 5464 | md_write_start(mddev, bi); |
620125f2 SL |
5465 | |
5466 | stripe_sectors = conf->chunk_sectors * | |
5467 | (conf->raid_disks - conf->max_degraded); | |
5468 | logical_sector = DIV_ROUND_UP_SECTOR_T(logical_sector, | |
5469 | stripe_sectors); | |
5470 | sector_div(last_sector, stripe_sectors); | |
5471 | ||
5472 | logical_sector *= conf->chunk_sectors; | |
5473 | last_sector *= conf->chunk_sectors; | |
5474 | ||
5475 | for (; logical_sector < last_sector; | |
5476 | logical_sector += STRIPE_SECTORS) { | |
5477 | DEFINE_WAIT(w); | |
5478 | int d; | |
5479 | again: | |
6d036f7d | 5480 | sh = raid5_get_active_stripe(conf, logical_sector, 0, 0, 0); |
620125f2 SL |
5481 | prepare_to_wait(&conf->wait_for_overlap, &w, |
5482 | TASK_UNINTERRUPTIBLE); | |
f8dfcffd N |
5483 | set_bit(R5_Overlap, &sh->dev[sh->pd_idx].flags); |
5484 | if (test_bit(STRIPE_SYNCING, &sh->state)) { | |
6d036f7d | 5485 | raid5_release_stripe(sh); |
f8dfcffd N |
5486 | schedule(); |
5487 | goto again; | |
5488 | } | |
5489 | clear_bit(R5_Overlap, &sh->dev[sh->pd_idx].flags); | |
620125f2 SL |
5490 | spin_lock_irq(&sh->stripe_lock); |
5491 | for (d = 0; d < conf->raid_disks; d++) { | |
5492 | if (d == sh->pd_idx || d == sh->qd_idx) | |
5493 | continue; | |
5494 | if (sh->dev[d].towrite || sh->dev[d].toread) { | |
5495 | set_bit(R5_Overlap, &sh->dev[d].flags); | |
5496 | spin_unlock_irq(&sh->stripe_lock); | |
6d036f7d | 5497 | raid5_release_stripe(sh); |
620125f2 SL |
5498 | schedule(); |
5499 | goto again; | |
5500 | } | |
5501 | } | |
f8dfcffd | 5502 | set_bit(STRIPE_DISCARD, &sh->state); |
620125f2 | 5503 | finish_wait(&conf->wait_for_overlap, &w); |
7a87f434 | 5504 | sh->overwrite_disks = 0; |
620125f2 SL |
5505 | for (d = 0; d < conf->raid_disks; d++) { |
5506 | if (d == sh->pd_idx || d == sh->qd_idx) | |
5507 | continue; | |
5508 | sh->dev[d].towrite = bi; | |
5509 | set_bit(R5_OVERWRITE, &sh->dev[d].flags); | |
5510 | raid5_inc_bi_active_stripes(bi); | |
49728050 | 5511 | md_write_inc(mddev, bi); |
7a87f434 | 5512 | sh->overwrite_disks++; |
620125f2 SL |
5513 | } |
5514 | spin_unlock_irq(&sh->stripe_lock); | |
5515 | if (conf->mddev->bitmap) { | |
5516 | for (d = 0; | |
5517 | d < conf->raid_disks - conf->max_degraded; | |
5518 | d++) | |
5519 | bitmap_startwrite(mddev->bitmap, | |
5520 | sh->sector, | |
5521 | STRIPE_SECTORS, | |
5522 | 0); | |
5523 | sh->bm_seq = conf->seq_flush + 1; | |
5524 | set_bit(STRIPE_BIT_DELAY, &sh->state); | |
5525 | } | |
5526 | ||
5527 | set_bit(STRIPE_HANDLE, &sh->state); | |
5528 | clear_bit(STRIPE_DELAYED, &sh->state); | |
5529 | if (!test_and_set_bit(STRIPE_PREREAD_ACTIVE, &sh->state)) | |
5530 | atomic_inc(&conf->preread_active_stripes); | |
5531 | release_stripe_plug(mddev, sh); | |
5532 | } | |
5533 | ||
49728050 | 5534 | md_write_end(mddev); |
620125f2 SL |
5535 | remaining = raid5_dec_bi_active_stripes(bi); |
5536 | if (remaining == 0) { | |
4246a0b6 | 5537 | bio_endio(bi); |
620125f2 SL |
5538 | } |
5539 | } | |
5540 | ||
849674e4 | 5541 | static void raid5_make_request(struct mddev *mddev, struct bio * bi) |
1da177e4 | 5542 | { |
d1688a6d | 5543 | struct r5conf *conf = mddev->private; |
911d4ee8 | 5544 | int dd_idx; |
1da177e4 LT |
5545 | sector_t new_sector; |
5546 | sector_t logical_sector, last_sector; | |
5547 | struct stripe_head *sh; | |
a362357b | 5548 | const int rw = bio_data_dir(bi); |
49077326 | 5549 | int remaining; |
27c0f68f SL |
5550 | DEFINE_WAIT(w); |
5551 | bool do_prepare; | |
3bddb7f8 | 5552 | bool do_flush = false; |
1da177e4 | 5553 | |
1eff9d32 | 5554 | if (unlikely(bi->bi_opf & REQ_PREFLUSH)) { |
828cbe98 SL |
5555 | int ret = r5l_handle_flush_request(conf->log, bi); |
5556 | ||
5557 | if (ret == 0) | |
5558 | return; | |
5559 | if (ret == -ENODEV) { | |
5560 | md_flush_request(mddev, bi); | |
5561 | return; | |
5562 | } | |
5563 | /* ret == -EAGAIN, fallback */ | |
3bddb7f8 SL |
5564 | /* |
5565 | * if r5l_handle_flush_request() didn't clear REQ_PREFLUSH, | |
5566 | * we need to flush journal device | |
5567 | */ | |
5568 | do_flush = bi->bi_opf & REQ_PREFLUSH; | |
e5dcdd80 N |
5569 | } |
5570 | ||
9ffc8f7c EM |
5571 | /* |
5572 | * If array is degraded, better not do chunk aligned read because | |
5573 | * later we might have to read it again in order to reconstruct | |
5574 | * data on failed drives. | |
5575 | */ | |
5576 | if (rw == READ && mddev->degraded == 0 && | |
7ef6b12a ML |
5577 | mddev->reshape_position == MaxSector) { |
5578 | bi = chunk_aligned_read(mddev, bi); | |
5579 | if (!bi) | |
5580 | return; | |
5581 | } | |
52488615 | 5582 | |
796a5cf0 | 5583 | if (unlikely(bio_op(bi) == REQ_OP_DISCARD)) { |
620125f2 SL |
5584 | make_discard_request(mddev, bi); |
5585 | return; | |
5586 | } | |
5587 | ||
4f024f37 | 5588 | logical_sector = bi->bi_iter.bi_sector & ~((sector_t)STRIPE_SECTORS-1); |
f73a1c7d | 5589 | last_sector = bio_end_sector(bi); |
1da177e4 LT |
5590 | bi->bi_next = NULL; |
5591 | bi->bi_phys_segments = 1; /* over-loaded to count active stripes */ | |
49728050 | 5592 | md_write_start(mddev, bi); |
06d91a5f | 5593 | |
27c0f68f | 5594 | prepare_to_wait(&conf->wait_for_overlap, &w, TASK_UNINTERRUPTIBLE); |
1da177e4 | 5595 | for (;logical_sector < last_sector; logical_sector += STRIPE_SECTORS) { |
b5663ba4 | 5596 | int previous; |
c46501b2 | 5597 | int seq; |
b578d55f | 5598 | |
27c0f68f | 5599 | do_prepare = false; |
7ecaa1e6 | 5600 | retry: |
c46501b2 | 5601 | seq = read_seqcount_begin(&conf->gen_lock); |
b5663ba4 | 5602 | previous = 0; |
27c0f68f SL |
5603 | if (do_prepare) |
5604 | prepare_to_wait(&conf->wait_for_overlap, &w, | |
5605 | TASK_UNINTERRUPTIBLE); | |
b0f9ec04 | 5606 | if (unlikely(conf->reshape_progress != MaxSector)) { |
fef9c61f | 5607 | /* spinlock is needed as reshape_progress may be |
df8e7f76 N |
5608 | * 64bit on a 32bit platform, and so it might be |
5609 | * possible to see a half-updated value | |
aeb878b0 | 5610 | * Of course reshape_progress could change after |
df8e7f76 N |
5611 | * the lock is dropped, so once we get a reference |
5612 | * to the stripe that we think it is, we will have | |
5613 | * to check again. | |
5614 | */ | |
7ecaa1e6 | 5615 | spin_lock_irq(&conf->device_lock); |
2c810cdd | 5616 | if (mddev->reshape_backwards |
fef9c61f N |
5617 | ? logical_sector < conf->reshape_progress |
5618 | : logical_sector >= conf->reshape_progress) { | |
b5663ba4 N |
5619 | previous = 1; |
5620 | } else { | |
2c810cdd | 5621 | if (mddev->reshape_backwards |
fef9c61f N |
5622 | ? logical_sector < conf->reshape_safe |
5623 | : logical_sector >= conf->reshape_safe) { | |
b578d55f N |
5624 | spin_unlock_irq(&conf->device_lock); |
5625 | schedule(); | |
27c0f68f | 5626 | do_prepare = true; |
b578d55f N |
5627 | goto retry; |
5628 | } | |
5629 | } | |
7ecaa1e6 N |
5630 | spin_unlock_irq(&conf->device_lock); |
5631 | } | |
16a53ecc | 5632 | |
112bf897 N |
5633 | new_sector = raid5_compute_sector(conf, logical_sector, |
5634 | previous, | |
911d4ee8 | 5635 | &dd_idx, NULL); |
849674e4 | 5636 | pr_debug("raid456: raid5_make_request, sector %llu logical %llu\n", |
c46501b2 | 5637 | (unsigned long long)new_sector, |
1da177e4 LT |
5638 | (unsigned long long)logical_sector); |
5639 | ||
6d036f7d | 5640 | sh = raid5_get_active_stripe(conf, new_sector, previous, |
1eff9d32 | 5641 | (bi->bi_opf & REQ_RAHEAD), 0); |
1da177e4 | 5642 | if (sh) { |
b0f9ec04 | 5643 | if (unlikely(previous)) { |
7ecaa1e6 | 5644 | /* expansion might have moved on while waiting for a |
df8e7f76 N |
5645 | * stripe, so we must do the range check again. |
5646 | * Expansion could still move past after this | |
5647 | * test, but as we are holding a reference to | |
5648 | * 'sh', we know that if that happens, | |
5649 | * STRIPE_EXPANDING will get set and the expansion | |
5650 | * won't proceed until we finish with the stripe. | |
7ecaa1e6 N |
5651 | */ |
5652 | int must_retry = 0; | |
5653 | spin_lock_irq(&conf->device_lock); | |
2c810cdd | 5654 | if (mddev->reshape_backwards |
b0f9ec04 N |
5655 | ? logical_sector >= conf->reshape_progress |
5656 | : logical_sector < conf->reshape_progress) | |
7ecaa1e6 N |
5657 | /* mismatch, need to try again */ |
5658 | must_retry = 1; | |
5659 | spin_unlock_irq(&conf->device_lock); | |
5660 | if (must_retry) { | |
6d036f7d | 5661 | raid5_release_stripe(sh); |
7a3ab908 | 5662 | schedule(); |
27c0f68f | 5663 | do_prepare = true; |
7ecaa1e6 N |
5664 | goto retry; |
5665 | } | |
5666 | } | |
c46501b2 N |
5667 | if (read_seqcount_retry(&conf->gen_lock, seq)) { |
5668 | /* Might have got the wrong stripe_head | |
5669 | * by accident | |
5670 | */ | |
6d036f7d | 5671 | raid5_release_stripe(sh); |
c46501b2 N |
5672 | goto retry; |
5673 | } | |
e62e58a5 | 5674 | |
ffd96e35 | 5675 | if (rw == WRITE && |
a5c308d4 | 5676 | logical_sector >= mddev->suspend_lo && |
e464eafd | 5677 | logical_sector < mddev->suspend_hi) { |
6d036f7d | 5678 | raid5_release_stripe(sh); |
e62e58a5 N |
5679 | /* As the suspend_* range is controlled by |
5680 | * userspace, we want an interruptible | |
5681 | * wait. | |
5682 | */ | |
5683 | flush_signals(current); | |
5684 | prepare_to_wait(&conf->wait_for_overlap, | |
5685 | &w, TASK_INTERRUPTIBLE); | |
5686 | if (logical_sector >= mddev->suspend_lo && | |
27c0f68f | 5687 | logical_sector < mddev->suspend_hi) { |
e62e58a5 | 5688 | schedule(); |
27c0f68f SL |
5689 | do_prepare = true; |
5690 | } | |
e464eafd N |
5691 | goto retry; |
5692 | } | |
7ecaa1e6 N |
5693 | |
5694 | if (test_bit(STRIPE_EXPANDING, &sh->state) || | |
da41ba65 | 5695 | !add_stripe_bio(sh, bi, dd_idx, rw, previous)) { |
7ecaa1e6 N |
5696 | /* Stripe is busy expanding or |
5697 | * add failed due to overlap. Flush everything | |
1da177e4 LT |
5698 | * and wait a while |
5699 | */ | |
482c0834 | 5700 | md_wakeup_thread(mddev->thread); |
6d036f7d | 5701 | raid5_release_stripe(sh); |
1da177e4 | 5702 | schedule(); |
27c0f68f | 5703 | do_prepare = true; |
1da177e4 LT |
5704 | goto retry; |
5705 | } | |
3bddb7f8 SL |
5706 | if (do_flush) { |
5707 | set_bit(STRIPE_R5C_PREFLUSH, &sh->state); | |
5708 | /* we only need flush for one stripe */ | |
5709 | do_flush = false; | |
5710 | } | |
5711 | ||
6ed3003c N |
5712 | set_bit(STRIPE_HANDLE, &sh->state); |
5713 | clear_bit(STRIPE_DELAYED, &sh->state); | |
59fc630b | 5714 | if ((!sh->batch_head || sh == sh->batch_head) && |
1eff9d32 | 5715 | (bi->bi_opf & REQ_SYNC) && |
729a1866 N |
5716 | !test_and_set_bit(STRIPE_PREREAD_ACTIVE, &sh->state)) |
5717 | atomic_inc(&conf->preread_active_stripes); | |
8811b596 | 5718 | release_stripe_plug(mddev, sh); |
1da177e4 LT |
5719 | } else { |
5720 | /* cannot get stripe for read-ahead, just give-up */ | |
4246a0b6 | 5721 | bi->bi_error = -EIO; |
1da177e4 LT |
5722 | break; |
5723 | } | |
1da177e4 | 5724 | } |
27c0f68f | 5725 | finish_wait(&conf->wait_for_overlap, &w); |
7c13edc8 | 5726 | |
49728050 N |
5727 | if (rw == WRITE) |
5728 | md_write_end(mddev); | |
e7836bd6 | 5729 | remaining = raid5_dec_bi_active_stripes(bi); |
f6344757 | 5730 | if (remaining == 0) { |
1da177e4 | 5731 | |
6712ecf8 | 5732 | |
0a82a8d1 LT |
5733 | trace_block_bio_complete(bdev_get_queue(bi->bi_bdev), |
5734 | bi, 0); | |
4246a0b6 | 5735 | bio_endio(bi); |
1da177e4 | 5736 | } |
1da177e4 LT |
5737 | } |
5738 | ||
fd01b88c | 5739 | static sector_t raid5_size(struct mddev *mddev, sector_t sectors, int raid_disks); |
b522adcd | 5740 | |
fd01b88c | 5741 | static sector_t reshape_request(struct mddev *mddev, sector_t sector_nr, int *skipped) |
1da177e4 | 5742 | { |
52c03291 N |
5743 | /* reshaping is quite different to recovery/resync so it is |
5744 | * handled quite separately ... here. | |
5745 | * | |
5746 | * On each call to sync_request, we gather one chunk worth of | |
5747 | * destination stripes and flag them as expanding. | |
5748 | * Then we find all the source stripes and request reads. | |
5749 | * As the reads complete, handle_stripe will copy the data | |
5750 | * into the destination stripe and release that stripe. | |
5751 | */ | |
d1688a6d | 5752 | struct r5conf *conf = mddev->private; |
1da177e4 | 5753 | struct stripe_head *sh; |
ccfcc3c1 | 5754 | sector_t first_sector, last_sector; |
f416885e N |
5755 | int raid_disks = conf->previous_raid_disks; |
5756 | int data_disks = raid_disks - conf->max_degraded; | |
5757 | int new_data_disks = conf->raid_disks - conf->max_degraded; | |
52c03291 N |
5758 | int i; |
5759 | int dd_idx; | |
c8f517c4 | 5760 | sector_t writepos, readpos, safepos; |
ec32a2bd | 5761 | sector_t stripe_addr; |
7a661381 | 5762 | int reshape_sectors; |
ab69ae12 | 5763 | struct list_head stripes; |
92140480 | 5764 | sector_t retn; |
52c03291 | 5765 | |
fef9c61f N |
5766 | if (sector_nr == 0) { |
5767 | /* If restarting in the middle, skip the initial sectors */ | |
2c810cdd | 5768 | if (mddev->reshape_backwards && |
fef9c61f N |
5769 | conf->reshape_progress < raid5_size(mddev, 0, 0)) { |
5770 | sector_nr = raid5_size(mddev, 0, 0) | |
5771 | - conf->reshape_progress; | |
6cbd8148 N |
5772 | } else if (mddev->reshape_backwards && |
5773 | conf->reshape_progress == MaxSector) { | |
5774 | /* shouldn't happen, but just in case, finish up.*/ | |
5775 | sector_nr = MaxSector; | |
2c810cdd | 5776 | } else if (!mddev->reshape_backwards && |
fef9c61f N |
5777 | conf->reshape_progress > 0) |
5778 | sector_nr = conf->reshape_progress; | |
f416885e | 5779 | sector_div(sector_nr, new_data_disks); |
fef9c61f | 5780 | if (sector_nr) { |
8dee7211 N |
5781 | mddev->curr_resync_completed = sector_nr; |
5782 | sysfs_notify(&mddev->kobj, NULL, "sync_completed"); | |
fef9c61f | 5783 | *skipped = 1; |
92140480 N |
5784 | retn = sector_nr; |
5785 | goto finish; | |
fef9c61f | 5786 | } |
52c03291 N |
5787 | } |
5788 | ||
7a661381 N |
5789 | /* We need to process a full chunk at a time. |
5790 | * If old and new chunk sizes differ, we need to process the | |
5791 | * largest of these | |
5792 | */ | |
3cb5edf4 N |
5793 | |
5794 | reshape_sectors = max(conf->chunk_sectors, conf->prev_chunk_sectors); | |
7a661381 | 5795 | |
b5254dd5 N |
5796 | /* We update the metadata at least every 10 seconds, or when |
5797 | * the data about to be copied would over-write the source of | |
5798 | * the data at the front of the range. i.e. one new_stripe | |
5799 | * along from reshape_progress new_maps to after where | |
5800 | * reshape_safe old_maps to | |
52c03291 | 5801 | */ |
fef9c61f | 5802 | writepos = conf->reshape_progress; |
f416885e | 5803 | sector_div(writepos, new_data_disks); |
c8f517c4 N |
5804 | readpos = conf->reshape_progress; |
5805 | sector_div(readpos, data_disks); | |
fef9c61f | 5806 | safepos = conf->reshape_safe; |
f416885e | 5807 | sector_div(safepos, data_disks); |
2c810cdd | 5808 | if (mddev->reshape_backwards) { |
c74c0d76 N |
5809 | BUG_ON(writepos < reshape_sectors); |
5810 | writepos -= reshape_sectors; | |
c8f517c4 | 5811 | readpos += reshape_sectors; |
7a661381 | 5812 | safepos += reshape_sectors; |
fef9c61f | 5813 | } else { |
7a661381 | 5814 | writepos += reshape_sectors; |
c74c0d76 N |
5815 | /* readpos and safepos are worst-case calculations. |
5816 | * A negative number is overly pessimistic, and causes | |
5817 | * obvious problems for unsigned storage. So clip to 0. | |
5818 | */ | |
ed37d83e N |
5819 | readpos -= min_t(sector_t, reshape_sectors, readpos); |
5820 | safepos -= min_t(sector_t, reshape_sectors, safepos); | |
fef9c61f | 5821 | } |
52c03291 | 5822 | |
b5254dd5 N |
5823 | /* Having calculated the 'writepos' possibly use it |
5824 | * to set 'stripe_addr' which is where we will write to. | |
5825 | */ | |
5826 | if (mddev->reshape_backwards) { | |
5827 | BUG_ON(conf->reshape_progress == 0); | |
5828 | stripe_addr = writepos; | |
5829 | BUG_ON((mddev->dev_sectors & | |
5830 | ~((sector_t)reshape_sectors - 1)) | |
5831 | - reshape_sectors - stripe_addr | |
5832 | != sector_nr); | |
5833 | } else { | |
5834 | BUG_ON(writepos != sector_nr + reshape_sectors); | |
5835 | stripe_addr = sector_nr; | |
5836 | } | |
5837 | ||
c8f517c4 N |
5838 | /* 'writepos' is the most advanced device address we might write. |
5839 | * 'readpos' is the least advanced device address we might read. | |
5840 | * 'safepos' is the least address recorded in the metadata as having | |
5841 | * been reshaped. | |
b5254dd5 N |
5842 | * If there is a min_offset_diff, these are adjusted either by |
5843 | * increasing the safepos/readpos if diff is negative, or | |
5844 | * increasing writepos if diff is positive. | |
5845 | * If 'readpos' is then behind 'writepos', there is no way that we can | |
c8f517c4 N |
5846 | * ensure safety in the face of a crash - that must be done by userspace |
5847 | * making a backup of the data. So in that case there is no particular | |
5848 | * rush to update metadata. | |
5849 | * Otherwise if 'safepos' is behind 'writepos', then we really need to | |
5850 | * update the metadata to advance 'safepos' to match 'readpos' so that | |
5851 | * we can be safe in the event of a crash. | |
5852 | * So we insist on updating metadata if safepos is behind writepos and | |
5853 | * readpos is beyond writepos. | |
5854 | * In any case, update the metadata every 10 seconds. | |
5855 | * Maybe that number should be configurable, but I'm not sure it is | |
5856 | * worth it.... maybe it could be a multiple of safemode_delay??? | |
5857 | */ | |
b5254dd5 N |
5858 | if (conf->min_offset_diff < 0) { |
5859 | safepos += -conf->min_offset_diff; | |
5860 | readpos += -conf->min_offset_diff; | |
5861 | } else | |
5862 | writepos += conf->min_offset_diff; | |
5863 | ||
2c810cdd | 5864 | if ((mddev->reshape_backwards |
c8f517c4 N |
5865 | ? (safepos > writepos && readpos < writepos) |
5866 | : (safepos < writepos && readpos > writepos)) || | |
5867 | time_after(jiffies, conf->reshape_checkpoint + 10*HZ)) { | |
52c03291 N |
5868 | /* Cannot proceed until we've updated the superblock... */ |
5869 | wait_event(conf->wait_for_overlap, | |
c91abf5a N |
5870 | atomic_read(&conf->reshape_stripes)==0 |
5871 | || test_bit(MD_RECOVERY_INTR, &mddev->recovery)); | |
5872 | if (atomic_read(&conf->reshape_stripes) != 0) | |
5873 | return 0; | |
fef9c61f | 5874 | mddev->reshape_position = conf->reshape_progress; |
75d3da43 | 5875 | mddev->curr_resync_completed = sector_nr; |
c8f517c4 | 5876 | conf->reshape_checkpoint = jiffies; |
2953079c | 5877 | set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags); |
52c03291 | 5878 | md_wakeup_thread(mddev->thread); |
2953079c | 5879 | wait_event(mddev->sb_wait, mddev->sb_flags == 0 || |
c91abf5a N |
5880 | test_bit(MD_RECOVERY_INTR, &mddev->recovery)); |
5881 | if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) | |
5882 | return 0; | |
52c03291 | 5883 | spin_lock_irq(&conf->device_lock); |
fef9c61f | 5884 | conf->reshape_safe = mddev->reshape_position; |
52c03291 N |
5885 | spin_unlock_irq(&conf->device_lock); |
5886 | wake_up(&conf->wait_for_overlap); | |
acb180b0 | 5887 | sysfs_notify(&mddev->kobj, NULL, "sync_completed"); |
52c03291 N |
5888 | } |
5889 | ||
ab69ae12 | 5890 | INIT_LIST_HEAD(&stripes); |
7a661381 | 5891 | for (i = 0; i < reshape_sectors; i += STRIPE_SECTORS) { |
52c03291 | 5892 | int j; |
a9f326eb | 5893 | int skipped_disk = 0; |
6d036f7d | 5894 | sh = raid5_get_active_stripe(conf, stripe_addr+i, 0, 0, 1); |
52c03291 N |
5895 | set_bit(STRIPE_EXPANDING, &sh->state); |
5896 | atomic_inc(&conf->reshape_stripes); | |
5897 | /* If any of this stripe is beyond the end of the old | |
5898 | * array, then we need to zero those blocks | |
5899 | */ | |
5900 | for (j=sh->disks; j--;) { | |
5901 | sector_t s; | |
5902 | if (j == sh->pd_idx) | |
5903 | continue; | |
f416885e | 5904 | if (conf->level == 6 && |
d0dabf7e | 5905 | j == sh->qd_idx) |
f416885e | 5906 | continue; |
6d036f7d | 5907 | s = raid5_compute_blocknr(sh, j, 0); |
b522adcd | 5908 | if (s < raid5_size(mddev, 0, 0)) { |
a9f326eb | 5909 | skipped_disk = 1; |
52c03291 N |
5910 | continue; |
5911 | } | |
5912 | memset(page_address(sh->dev[j].page), 0, STRIPE_SIZE); | |
5913 | set_bit(R5_Expanded, &sh->dev[j].flags); | |
5914 | set_bit(R5_UPTODATE, &sh->dev[j].flags); | |
5915 | } | |
a9f326eb | 5916 | if (!skipped_disk) { |
52c03291 N |
5917 | set_bit(STRIPE_EXPAND_READY, &sh->state); |
5918 | set_bit(STRIPE_HANDLE, &sh->state); | |
5919 | } | |
ab69ae12 | 5920 | list_add(&sh->lru, &stripes); |
52c03291 N |
5921 | } |
5922 | spin_lock_irq(&conf->device_lock); | |
2c810cdd | 5923 | if (mddev->reshape_backwards) |
7a661381 | 5924 | conf->reshape_progress -= reshape_sectors * new_data_disks; |
fef9c61f | 5925 | else |
7a661381 | 5926 | conf->reshape_progress += reshape_sectors * new_data_disks; |
52c03291 N |
5927 | spin_unlock_irq(&conf->device_lock); |
5928 | /* Ok, those stripe are ready. We can start scheduling | |
5929 | * reads on the source stripes. | |
5930 | * The source stripes are determined by mapping the first and last | |
5931 | * block on the destination stripes. | |
5932 | */ | |
52c03291 | 5933 | first_sector = |
ec32a2bd | 5934 | raid5_compute_sector(conf, stripe_addr*(new_data_disks), |
911d4ee8 | 5935 | 1, &dd_idx, NULL); |
52c03291 | 5936 | last_sector = |
0e6e0271 | 5937 | raid5_compute_sector(conf, ((stripe_addr+reshape_sectors) |
09c9e5fa | 5938 | * new_data_disks - 1), |
911d4ee8 | 5939 | 1, &dd_idx, NULL); |
58c0fed4 AN |
5940 | if (last_sector >= mddev->dev_sectors) |
5941 | last_sector = mddev->dev_sectors - 1; | |
52c03291 | 5942 | while (first_sector <= last_sector) { |
6d036f7d | 5943 | sh = raid5_get_active_stripe(conf, first_sector, 1, 0, 1); |
52c03291 N |
5944 | set_bit(STRIPE_EXPAND_SOURCE, &sh->state); |
5945 | set_bit(STRIPE_HANDLE, &sh->state); | |
6d036f7d | 5946 | raid5_release_stripe(sh); |
52c03291 N |
5947 | first_sector += STRIPE_SECTORS; |
5948 | } | |
ab69ae12 N |
5949 | /* Now that the sources are clearly marked, we can release |
5950 | * the destination stripes | |
5951 | */ | |
5952 | while (!list_empty(&stripes)) { | |
5953 | sh = list_entry(stripes.next, struct stripe_head, lru); | |
5954 | list_del_init(&sh->lru); | |
6d036f7d | 5955 | raid5_release_stripe(sh); |
ab69ae12 | 5956 | } |
c6207277 N |
5957 | /* If this takes us to the resync_max point where we have to pause, |
5958 | * then we need to write out the superblock. | |
5959 | */ | |
7a661381 | 5960 | sector_nr += reshape_sectors; |
92140480 N |
5961 | retn = reshape_sectors; |
5962 | finish: | |
c5e19d90 N |
5963 | if (mddev->curr_resync_completed > mddev->resync_max || |
5964 | (sector_nr - mddev->curr_resync_completed) * 2 | |
c03f6a19 | 5965 | >= mddev->resync_max - mddev->curr_resync_completed) { |
c6207277 N |
5966 | /* Cannot proceed until we've updated the superblock... */ |
5967 | wait_event(conf->wait_for_overlap, | |
c91abf5a N |
5968 | atomic_read(&conf->reshape_stripes) == 0 |
5969 | || test_bit(MD_RECOVERY_INTR, &mddev->recovery)); | |
5970 | if (atomic_read(&conf->reshape_stripes) != 0) | |
5971 | goto ret; | |
fef9c61f | 5972 | mddev->reshape_position = conf->reshape_progress; |
75d3da43 | 5973 | mddev->curr_resync_completed = sector_nr; |
c8f517c4 | 5974 | conf->reshape_checkpoint = jiffies; |
2953079c | 5975 | set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags); |
c6207277 N |
5976 | md_wakeup_thread(mddev->thread); |
5977 | wait_event(mddev->sb_wait, | |
2953079c | 5978 | !test_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags) |
c91abf5a N |
5979 | || test_bit(MD_RECOVERY_INTR, &mddev->recovery)); |
5980 | if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) | |
5981 | goto ret; | |
c6207277 | 5982 | spin_lock_irq(&conf->device_lock); |
fef9c61f | 5983 | conf->reshape_safe = mddev->reshape_position; |
c6207277 N |
5984 | spin_unlock_irq(&conf->device_lock); |
5985 | wake_up(&conf->wait_for_overlap); | |
acb180b0 | 5986 | sysfs_notify(&mddev->kobj, NULL, "sync_completed"); |
c6207277 | 5987 | } |
c91abf5a | 5988 | ret: |
92140480 | 5989 | return retn; |
52c03291 N |
5990 | } |
5991 | ||
849674e4 SL |
5992 | static inline sector_t raid5_sync_request(struct mddev *mddev, sector_t sector_nr, |
5993 | int *skipped) | |
52c03291 | 5994 | { |
d1688a6d | 5995 | struct r5conf *conf = mddev->private; |
52c03291 | 5996 | struct stripe_head *sh; |
58c0fed4 | 5997 | sector_t max_sector = mddev->dev_sectors; |
57dab0bd | 5998 | sector_t sync_blocks; |
16a53ecc N |
5999 | int still_degraded = 0; |
6000 | int i; | |
1da177e4 | 6001 | |
72626685 | 6002 | if (sector_nr >= max_sector) { |
1da177e4 | 6003 | /* just being told to finish up .. nothing much to do */ |
cea9c228 | 6004 | |
29269553 N |
6005 | if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)) { |
6006 | end_reshape(conf); | |
6007 | return 0; | |
6008 | } | |
72626685 N |
6009 | |
6010 | if (mddev->curr_resync < max_sector) /* aborted */ | |
6011 | bitmap_end_sync(mddev->bitmap, mddev->curr_resync, | |
6012 | &sync_blocks, 1); | |
16a53ecc | 6013 | else /* completed sync */ |
72626685 N |
6014 | conf->fullsync = 0; |
6015 | bitmap_close_sync(mddev->bitmap); | |
6016 | ||
1da177e4 LT |
6017 | return 0; |
6018 | } | |
ccfcc3c1 | 6019 | |
64bd660b N |
6020 | /* Allow raid5_quiesce to complete */ |
6021 | wait_event(conf->wait_for_overlap, conf->quiesce != 2); | |
6022 | ||
52c03291 N |
6023 | if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)) |
6024 | return reshape_request(mddev, sector_nr, skipped); | |
f6705578 | 6025 | |
c6207277 N |
6026 | /* No need to check resync_max as we never do more than one |
6027 | * stripe, and as resync_max will always be on a chunk boundary, | |
6028 | * if the check in md_do_sync didn't fire, there is no chance | |
6029 | * of overstepping resync_max here | |
6030 | */ | |
6031 | ||
16a53ecc | 6032 | /* if there is too many failed drives and we are trying |
1da177e4 LT |
6033 | * to resync, then assert that we are finished, because there is |
6034 | * nothing we can do. | |
6035 | */ | |
3285edf1 | 6036 | if (mddev->degraded >= conf->max_degraded && |
16a53ecc | 6037 | test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) { |
58c0fed4 | 6038 | sector_t rv = mddev->dev_sectors - sector_nr; |
57afd89f | 6039 | *skipped = 1; |
1da177e4 LT |
6040 | return rv; |
6041 | } | |
6f608040 | 6042 | if (!test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery) && |
6043 | !conf->fullsync && | |
6044 | !bitmap_start_sync(mddev->bitmap, sector_nr, &sync_blocks, 1) && | |
6045 | sync_blocks >= STRIPE_SECTORS) { | |
72626685 N |
6046 | /* we can skip this block, and probably more */ |
6047 | sync_blocks /= STRIPE_SECTORS; | |
6048 | *skipped = 1; | |
6049 | return sync_blocks * STRIPE_SECTORS; /* keep things rounded to whole stripes */ | |
6050 | } | |
1da177e4 | 6051 | |
c40f341f | 6052 | bitmap_cond_end_sync(mddev->bitmap, sector_nr, false); |
b47490c9 | 6053 | |
6d036f7d | 6054 | sh = raid5_get_active_stripe(conf, sector_nr, 0, 1, 0); |
1da177e4 | 6055 | if (sh == NULL) { |
6d036f7d | 6056 | sh = raid5_get_active_stripe(conf, sector_nr, 0, 0, 0); |
1da177e4 | 6057 | /* make sure we don't swamp the stripe cache if someone else |
16a53ecc | 6058 | * is trying to get access |
1da177e4 | 6059 | */ |
66c006a5 | 6060 | schedule_timeout_uninterruptible(1); |
1da177e4 | 6061 | } |
16a53ecc | 6062 | /* Need to check if array will still be degraded after recovery/resync |
16d9cfab EM |
6063 | * Note in case of > 1 drive failures it's possible we're rebuilding |
6064 | * one drive while leaving another faulty drive in array. | |
16a53ecc | 6065 | */ |
16d9cfab EM |
6066 | rcu_read_lock(); |
6067 | for (i = 0; i < conf->raid_disks; i++) { | |
6068 | struct md_rdev *rdev = ACCESS_ONCE(conf->disks[i].rdev); | |
6069 | ||
6070 | if (rdev == NULL || test_bit(Faulty, &rdev->flags)) | |
16a53ecc | 6071 | still_degraded = 1; |
16d9cfab EM |
6072 | } |
6073 | rcu_read_unlock(); | |
16a53ecc N |
6074 | |
6075 | bitmap_start_sync(mddev->bitmap, sector_nr, &sync_blocks, still_degraded); | |
6076 | ||
83206d66 | 6077 | set_bit(STRIPE_SYNC_REQUESTED, &sh->state); |
053f5b65 | 6078 | set_bit(STRIPE_HANDLE, &sh->state); |
1da177e4 | 6079 | |
6d036f7d | 6080 | raid5_release_stripe(sh); |
1da177e4 LT |
6081 | |
6082 | return STRIPE_SECTORS; | |
6083 | } | |
6084 | ||
d1688a6d | 6085 | static int retry_aligned_read(struct r5conf *conf, struct bio *raid_bio) |
46031f9a RBJ |
6086 | { |
6087 | /* We may not be able to submit a whole bio at once as there | |
6088 | * may not be enough stripe_heads available. | |
6089 | * We cannot pre-allocate enough stripe_heads as we may need | |
6090 | * more than exist in the cache (if we allow ever large chunks). | |
6091 | * So we do one stripe head at a time and record in | |
6092 | * ->bi_hw_segments how many have been done. | |
6093 | * | |
6094 | * We *know* that this entire raid_bio is in one chunk, so | |
6095 | * it will be only one 'dd_idx' and only need one call to raid5_compute_sector. | |
6096 | */ | |
6097 | struct stripe_head *sh; | |
911d4ee8 | 6098 | int dd_idx; |
46031f9a RBJ |
6099 | sector_t sector, logical_sector, last_sector; |
6100 | int scnt = 0; | |
6101 | int remaining; | |
6102 | int handled = 0; | |
6103 | ||
4f024f37 KO |
6104 | logical_sector = raid_bio->bi_iter.bi_sector & |
6105 | ~((sector_t)STRIPE_SECTORS-1); | |
112bf897 | 6106 | sector = raid5_compute_sector(conf, logical_sector, |
911d4ee8 | 6107 | 0, &dd_idx, NULL); |
f73a1c7d | 6108 | last_sector = bio_end_sector(raid_bio); |
46031f9a RBJ |
6109 | |
6110 | for (; logical_sector < last_sector; | |
387bb173 NB |
6111 | logical_sector += STRIPE_SECTORS, |
6112 | sector += STRIPE_SECTORS, | |
6113 | scnt++) { | |
46031f9a | 6114 | |
e7836bd6 | 6115 | if (scnt < raid5_bi_processed_stripes(raid_bio)) |
46031f9a RBJ |
6116 | /* already done this stripe */ |
6117 | continue; | |
6118 | ||
6d036f7d | 6119 | sh = raid5_get_active_stripe(conf, sector, 0, 1, 1); |
46031f9a RBJ |
6120 | |
6121 | if (!sh) { | |
6122 | /* failed to get a stripe - must wait */ | |
e7836bd6 | 6123 | raid5_set_bi_processed_stripes(raid_bio, scnt); |
46031f9a RBJ |
6124 | conf->retry_read_aligned = raid_bio; |
6125 | return handled; | |
6126 | } | |
6127 | ||
da41ba65 | 6128 | if (!add_stripe_bio(sh, raid_bio, dd_idx, 0, 0)) { |
6d036f7d | 6129 | raid5_release_stripe(sh); |
e7836bd6 | 6130 | raid5_set_bi_processed_stripes(raid_bio, scnt); |
387bb173 NB |
6131 | conf->retry_read_aligned = raid_bio; |
6132 | return handled; | |
6133 | } | |
6134 | ||
3f9e7c14 | 6135 | set_bit(R5_ReadNoMerge, &sh->dev[dd_idx].flags); |
36d1c647 | 6136 | handle_stripe(sh); |
6d036f7d | 6137 | raid5_release_stripe(sh); |
46031f9a RBJ |
6138 | handled++; |
6139 | } | |
e7836bd6 | 6140 | remaining = raid5_dec_bi_active_stripes(raid_bio); |
0a82a8d1 LT |
6141 | if (remaining == 0) { |
6142 | trace_block_bio_complete(bdev_get_queue(raid_bio->bi_bdev), | |
6143 | raid_bio, 0); | |
4246a0b6 | 6144 | bio_endio(raid_bio); |
0a82a8d1 | 6145 | } |
46031f9a | 6146 | if (atomic_dec_and_test(&conf->active_aligned_reads)) |
b1b46486 | 6147 | wake_up(&conf->wait_for_quiescent); |
46031f9a RBJ |
6148 | return handled; |
6149 | } | |
6150 | ||
bfc90cb0 | 6151 | static int handle_active_stripes(struct r5conf *conf, int group, |
566c09c5 SL |
6152 | struct r5worker *worker, |
6153 | struct list_head *temp_inactive_list) | |
46a06401 SL |
6154 | { |
6155 | struct stripe_head *batch[MAX_STRIPE_BATCH], *sh; | |
566c09c5 SL |
6156 | int i, batch_size = 0, hash; |
6157 | bool release_inactive = false; | |
46a06401 SL |
6158 | |
6159 | while (batch_size < MAX_STRIPE_BATCH && | |
851c30c9 | 6160 | (sh = __get_priority_stripe(conf, group)) != NULL) |
46a06401 SL |
6161 | batch[batch_size++] = sh; |
6162 | ||
566c09c5 SL |
6163 | if (batch_size == 0) { |
6164 | for (i = 0; i < NR_STRIPE_HASH_LOCKS; i++) | |
6165 | if (!list_empty(temp_inactive_list + i)) | |
6166 | break; | |
a8c34f91 SL |
6167 | if (i == NR_STRIPE_HASH_LOCKS) { |
6168 | spin_unlock_irq(&conf->device_lock); | |
6169 | r5l_flush_stripe_to_raid(conf->log); | |
6170 | spin_lock_irq(&conf->device_lock); | |
566c09c5 | 6171 | return batch_size; |
a8c34f91 | 6172 | } |
566c09c5 SL |
6173 | release_inactive = true; |
6174 | } | |
46a06401 SL |
6175 | spin_unlock_irq(&conf->device_lock); |
6176 | ||
566c09c5 SL |
6177 | release_inactive_stripe_list(conf, temp_inactive_list, |
6178 | NR_STRIPE_HASH_LOCKS); | |
6179 | ||
a8c34f91 | 6180 | r5l_flush_stripe_to_raid(conf->log); |
566c09c5 SL |
6181 | if (release_inactive) { |
6182 | spin_lock_irq(&conf->device_lock); | |
6183 | return 0; | |
6184 | } | |
6185 | ||
46a06401 SL |
6186 | for (i = 0; i < batch_size; i++) |
6187 | handle_stripe(batch[i]); | |
ff875738 | 6188 | log_write_stripe_run(conf); |
46a06401 SL |
6189 | |
6190 | cond_resched(); | |
6191 | ||
6192 | spin_lock_irq(&conf->device_lock); | |
566c09c5 SL |
6193 | for (i = 0; i < batch_size; i++) { |
6194 | hash = batch[i]->hash_lock_index; | |
6195 | __release_stripe(conf, batch[i], &temp_inactive_list[hash]); | |
6196 | } | |
46a06401 SL |
6197 | return batch_size; |
6198 | } | |
46031f9a | 6199 | |
851c30c9 SL |
6200 | static void raid5_do_work(struct work_struct *work) |
6201 | { | |
6202 | struct r5worker *worker = container_of(work, struct r5worker, work); | |
6203 | struct r5worker_group *group = worker->group; | |
6204 | struct r5conf *conf = group->conf; | |
16d997b7 | 6205 | struct mddev *mddev = conf->mddev; |
851c30c9 SL |
6206 | int group_id = group - conf->worker_groups; |
6207 | int handled; | |
6208 | struct blk_plug plug; | |
6209 | ||
6210 | pr_debug("+++ raid5worker active\n"); | |
6211 | ||
6212 | blk_start_plug(&plug); | |
6213 | handled = 0; | |
6214 | spin_lock_irq(&conf->device_lock); | |
6215 | while (1) { | |
6216 | int batch_size, released; | |
6217 | ||
566c09c5 | 6218 | released = release_stripe_list(conf, worker->temp_inactive_list); |
851c30c9 | 6219 | |
566c09c5 SL |
6220 | batch_size = handle_active_stripes(conf, group_id, worker, |
6221 | worker->temp_inactive_list); | |
bfc90cb0 | 6222 | worker->working = false; |
851c30c9 SL |
6223 | if (!batch_size && !released) |
6224 | break; | |
6225 | handled += batch_size; | |
16d997b7 N |
6226 | wait_event_lock_irq(mddev->sb_wait, |
6227 | !test_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags), | |
6228 | conf->device_lock); | |
851c30c9 SL |
6229 | } |
6230 | pr_debug("%d stripes handled\n", handled); | |
6231 | ||
6232 | spin_unlock_irq(&conf->device_lock); | |
6233 | blk_finish_plug(&plug); | |
6234 | ||
6235 | pr_debug("--- raid5worker inactive\n"); | |
6236 | } | |
6237 | ||
1da177e4 LT |
6238 | /* |
6239 | * This is our raid5 kernel thread. | |
6240 | * | |
6241 | * We scan the hash table for stripes which can be handled now. | |
6242 | * During the scan, completed stripes are saved for us by the interrupt | |
6243 | * handler, so that they will not have to wait for our next wakeup. | |
6244 | */ | |
4ed8731d | 6245 | static void raid5d(struct md_thread *thread) |
1da177e4 | 6246 | { |
4ed8731d | 6247 | struct mddev *mddev = thread->mddev; |
d1688a6d | 6248 | struct r5conf *conf = mddev->private; |
1da177e4 | 6249 | int handled; |
e1dfa0a2 | 6250 | struct blk_plug plug; |
1da177e4 | 6251 | |
45b4233c | 6252 | pr_debug("+++ raid5d active\n"); |
1da177e4 LT |
6253 | |
6254 | md_check_recovery(mddev); | |
1da177e4 | 6255 | |
e1dfa0a2 | 6256 | blk_start_plug(&plug); |
1da177e4 LT |
6257 | handled = 0; |
6258 | spin_lock_irq(&conf->device_lock); | |
6259 | while (1) { | |
46031f9a | 6260 | struct bio *bio; |
773ca82f SL |
6261 | int batch_size, released; |
6262 | ||
566c09c5 | 6263 | released = release_stripe_list(conf, conf->temp_inactive_list); |
edbe83ab N |
6264 | if (released) |
6265 | clear_bit(R5_DID_ALLOC, &conf->cache_state); | |
1da177e4 | 6266 | |
0021b7bc | 6267 | if ( |
7c13edc8 N |
6268 | !list_empty(&conf->bitmap_list)) { |
6269 | /* Now is a good time to flush some bitmap updates */ | |
6270 | conf->seq_flush++; | |
700e432d | 6271 | spin_unlock_irq(&conf->device_lock); |
72626685 | 6272 | bitmap_unplug(mddev->bitmap); |
700e432d | 6273 | spin_lock_irq(&conf->device_lock); |
7c13edc8 | 6274 | conf->seq_write = conf->seq_flush; |
566c09c5 | 6275 | activate_bit_delay(conf, conf->temp_inactive_list); |
72626685 | 6276 | } |
0021b7bc | 6277 | raid5_activate_delayed(conf); |
72626685 | 6278 | |
46031f9a RBJ |
6279 | while ((bio = remove_bio_from_retry(conf))) { |
6280 | int ok; | |
6281 | spin_unlock_irq(&conf->device_lock); | |
6282 | ok = retry_aligned_read(conf, bio); | |
6283 | spin_lock_irq(&conf->device_lock); | |
6284 | if (!ok) | |
6285 | break; | |
6286 | handled++; | |
6287 | } | |
6288 | ||
566c09c5 SL |
6289 | batch_size = handle_active_stripes(conf, ANY_GROUP, NULL, |
6290 | conf->temp_inactive_list); | |
773ca82f | 6291 | if (!batch_size && !released) |
1da177e4 | 6292 | break; |
46a06401 | 6293 | handled += batch_size; |
1da177e4 | 6294 | |
2953079c | 6295 | if (mddev->sb_flags & ~(1 << MD_SB_CHANGE_PENDING)) { |
46a06401 | 6296 | spin_unlock_irq(&conf->device_lock); |
de393cde | 6297 | md_check_recovery(mddev); |
46a06401 SL |
6298 | spin_lock_irq(&conf->device_lock); |
6299 | } | |
1da177e4 | 6300 | } |
45b4233c | 6301 | pr_debug("%d stripes handled\n", handled); |
1da177e4 LT |
6302 | |
6303 | spin_unlock_irq(&conf->device_lock); | |
2d5b569b N |
6304 | if (test_and_clear_bit(R5_ALLOC_MORE, &conf->cache_state) && |
6305 | mutex_trylock(&conf->cache_size_mutex)) { | |
edbe83ab N |
6306 | grow_one_stripe(conf, __GFP_NOWARN); |
6307 | /* Set flag even if allocation failed. This helps | |
6308 | * slow down allocation requests when mem is short | |
6309 | */ | |
6310 | set_bit(R5_DID_ALLOC, &conf->cache_state); | |
2d5b569b | 6311 | mutex_unlock(&conf->cache_size_mutex); |
edbe83ab | 6312 | } |
1da177e4 | 6313 | |
765d704d SL |
6314 | flush_deferred_bios(conf); |
6315 | ||
0576b1c6 SL |
6316 | r5l_flush_stripe_to_raid(conf->log); |
6317 | ||
c9f21aaf | 6318 | async_tx_issue_pending_all(); |
e1dfa0a2 | 6319 | blk_finish_plug(&plug); |
1da177e4 | 6320 | |
45b4233c | 6321 | pr_debug("--- raid5d inactive\n"); |
1da177e4 LT |
6322 | } |
6323 | ||
3f294f4f | 6324 | static ssize_t |
fd01b88c | 6325 | raid5_show_stripe_cache_size(struct mddev *mddev, char *page) |
3f294f4f | 6326 | { |
7b1485ba N |
6327 | struct r5conf *conf; |
6328 | int ret = 0; | |
6329 | spin_lock(&mddev->lock); | |
6330 | conf = mddev->private; | |
96de1e66 | 6331 | if (conf) |
edbe83ab | 6332 | ret = sprintf(page, "%d\n", conf->min_nr_stripes); |
7b1485ba N |
6333 | spin_unlock(&mddev->lock); |
6334 | return ret; | |
3f294f4f N |
6335 | } |
6336 | ||
c41d4ac4 | 6337 | int |
fd01b88c | 6338 | raid5_set_cache_size(struct mddev *mddev, int size) |
3f294f4f | 6339 | { |
d1688a6d | 6340 | struct r5conf *conf = mddev->private; |
b5470dc5 DW |
6341 | int err; |
6342 | ||
c41d4ac4 | 6343 | if (size <= 16 || size > 32768) |
3f294f4f | 6344 | return -EINVAL; |
486f0644 | 6345 | |
edbe83ab | 6346 | conf->min_nr_stripes = size; |
2d5b569b | 6347 | mutex_lock(&conf->cache_size_mutex); |
486f0644 N |
6348 | while (size < conf->max_nr_stripes && |
6349 | drop_one_stripe(conf)) | |
6350 | ; | |
2d5b569b | 6351 | mutex_unlock(&conf->cache_size_mutex); |
486f0644 | 6352 | |
edbe83ab | 6353 | |
b5470dc5 DW |
6354 | err = md_allow_write(mddev); |
6355 | if (err) | |
6356 | return err; | |
486f0644 | 6357 | |
2d5b569b | 6358 | mutex_lock(&conf->cache_size_mutex); |
486f0644 N |
6359 | while (size > conf->max_nr_stripes) |
6360 | if (!grow_one_stripe(conf, GFP_KERNEL)) | |
6361 | break; | |
2d5b569b | 6362 | mutex_unlock(&conf->cache_size_mutex); |
486f0644 | 6363 | |
c41d4ac4 N |
6364 | return 0; |
6365 | } | |
6366 | EXPORT_SYMBOL(raid5_set_cache_size); | |
6367 | ||
6368 | static ssize_t | |
fd01b88c | 6369 | raid5_store_stripe_cache_size(struct mddev *mddev, const char *page, size_t len) |
c41d4ac4 | 6370 | { |
6791875e | 6371 | struct r5conf *conf; |
c41d4ac4 N |
6372 | unsigned long new; |
6373 | int err; | |
6374 | ||
6375 | if (len >= PAGE_SIZE) | |
6376 | return -EINVAL; | |
b29bebd6 | 6377 | if (kstrtoul(page, 10, &new)) |
c41d4ac4 | 6378 | return -EINVAL; |
6791875e | 6379 | err = mddev_lock(mddev); |
c41d4ac4 N |
6380 | if (err) |
6381 | return err; | |
6791875e N |
6382 | conf = mddev->private; |
6383 | if (!conf) | |
6384 | err = -ENODEV; | |
6385 | else | |
6386 | err = raid5_set_cache_size(mddev, new); | |
6387 | mddev_unlock(mddev); | |
6388 | ||
6389 | return err ?: len; | |
3f294f4f | 6390 | } |
007583c9 | 6391 | |
96de1e66 N |
6392 | static struct md_sysfs_entry |
6393 | raid5_stripecache_size = __ATTR(stripe_cache_size, S_IRUGO | S_IWUSR, | |
6394 | raid5_show_stripe_cache_size, | |
6395 | raid5_store_stripe_cache_size); | |
3f294f4f | 6396 | |
d06f191f MS |
6397 | static ssize_t |
6398 | raid5_show_rmw_level(struct mddev *mddev, char *page) | |
6399 | { | |
6400 | struct r5conf *conf = mddev->private; | |
6401 | if (conf) | |
6402 | return sprintf(page, "%d\n", conf->rmw_level); | |
6403 | else | |
6404 | return 0; | |
6405 | } | |
6406 | ||
6407 | static ssize_t | |
6408 | raid5_store_rmw_level(struct mddev *mddev, const char *page, size_t len) | |
6409 | { | |
6410 | struct r5conf *conf = mddev->private; | |
6411 | unsigned long new; | |
6412 | ||
6413 | if (!conf) | |
6414 | return -ENODEV; | |
6415 | ||
6416 | if (len >= PAGE_SIZE) | |
6417 | return -EINVAL; | |
6418 | ||
6419 | if (kstrtoul(page, 10, &new)) | |
6420 | return -EINVAL; | |
6421 | ||
6422 | if (new != PARITY_DISABLE_RMW && !raid6_call.xor_syndrome) | |
6423 | return -EINVAL; | |
6424 | ||
6425 | if (new != PARITY_DISABLE_RMW && | |
6426 | new != PARITY_ENABLE_RMW && | |
6427 | new != PARITY_PREFER_RMW) | |
6428 | return -EINVAL; | |
6429 | ||
6430 | conf->rmw_level = new; | |
6431 | return len; | |
6432 | } | |
6433 | ||
6434 | static struct md_sysfs_entry | |
6435 | raid5_rmw_level = __ATTR(rmw_level, S_IRUGO | S_IWUSR, | |
6436 | raid5_show_rmw_level, | |
6437 | raid5_store_rmw_level); | |
6438 | ||
6439 | ||
8b3e6cdc | 6440 | static ssize_t |
fd01b88c | 6441 | raid5_show_preread_threshold(struct mddev *mddev, char *page) |
8b3e6cdc | 6442 | { |
7b1485ba N |
6443 | struct r5conf *conf; |
6444 | int ret = 0; | |
6445 | spin_lock(&mddev->lock); | |
6446 | conf = mddev->private; | |
8b3e6cdc | 6447 | if (conf) |
7b1485ba N |
6448 | ret = sprintf(page, "%d\n", conf->bypass_threshold); |
6449 | spin_unlock(&mddev->lock); | |
6450 | return ret; | |
8b3e6cdc DW |
6451 | } |
6452 | ||
6453 | static ssize_t | |
fd01b88c | 6454 | raid5_store_preread_threshold(struct mddev *mddev, const char *page, size_t len) |
8b3e6cdc | 6455 | { |
6791875e | 6456 | struct r5conf *conf; |
4ef197d8 | 6457 | unsigned long new; |
6791875e N |
6458 | int err; |
6459 | ||
8b3e6cdc DW |
6460 | if (len >= PAGE_SIZE) |
6461 | return -EINVAL; | |
b29bebd6 | 6462 | if (kstrtoul(page, 10, &new)) |
8b3e6cdc | 6463 | return -EINVAL; |
6791875e N |
6464 | |
6465 | err = mddev_lock(mddev); | |
6466 | if (err) | |
6467 | return err; | |
6468 | conf = mddev->private; | |
6469 | if (!conf) | |
6470 | err = -ENODEV; | |
edbe83ab | 6471 | else if (new > conf->min_nr_stripes) |
6791875e N |
6472 | err = -EINVAL; |
6473 | else | |
6474 | conf->bypass_threshold = new; | |
6475 | mddev_unlock(mddev); | |
6476 | return err ?: len; | |
8b3e6cdc DW |
6477 | } |
6478 | ||
6479 | static struct md_sysfs_entry | |
6480 | raid5_preread_bypass_threshold = __ATTR(preread_bypass_threshold, | |
6481 | S_IRUGO | S_IWUSR, | |
6482 | raid5_show_preread_threshold, | |
6483 | raid5_store_preread_threshold); | |
6484 | ||
d592a996 SL |
6485 | static ssize_t |
6486 | raid5_show_skip_copy(struct mddev *mddev, char *page) | |
6487 | { | |
7b1485ba N |
6488 | struct r5conf *conf; |
6489 | int ret = 0; | |
6490 | spin_lock(&mddev->lock); | |
6491 | conf = mddev->private; | |
d592a996 | 6492 | if (conf) |
7b1485ba N |
6493 | ret = sprintf(page, "%d\n", conf->skip_copy); |
6494 | spin_unlock(&mddev->lock); | |
6495 | return ret; | |
d592a996 SL |
6496 | } |
6497 | ||
6498 | static ssize_t | |
6499 | raid5_store_skip_copy(struct mddev *mddev, const char *page, size_t len) | |
6500 | { | |
6791875e | 6501 | struct r5conf *conf; |
d592a996 | 6502 | unsigned long new; |
6791875e N |
6503 | int err; |
6504 | ||
d592a996 SL |
6505 | if (len >= PAGE_SIZE) |
6506 | return -EINVAL; | |
d592a996 SL |
6507 | if (kstrtoul(page, 10, &new)) |
6508 | return -EINVAL; | |
6509 | new = !!new; | |
6791875e N |
6510 | |
6511 | err = mddev_lock(mddev); | |
6512 | if (err) | |
6513 | return err; | |
6514 | conf = mddev->private; | |
6515 | if (!conf) | |
6516 | err = -ENODEV; | |
6517 | else if (new != conf->skip_copy) { | |
6518 | mddev_suspend(mddev); | |
6519 | conf->skip_copy = new; | |
6520 | if (new) | |
dc3b17cc | 6521 | mddev->queue->backing_dev_info->capabilities |= |
6791875e N |
6522 | BDI_CAP_STABLE_WRITES; |
6523 | else | |
dc3b17cc | 6524 | mddev->queue->backing_dev_info->capabilities &= |
6791875e N |
6525 | ~BDI_CAP_STABLE_WRITES; |
6526 | mddev_resume(mddev); | |
6527 | } | |
6528 | mddev_unlock(mddev); | |
6529 | return err ?: len; | |
d592a996 SL |
6530 | } |
6531 | ||
6532 | static struct md_sysfs_entry | |
6533 | raid5_skip_copy = __ATTR(skip_copy, S_IRUGO | S_IWUSR, | |
6534 | raid5_show_skip_copy, | |
6535 | raid5_store_skip_copy); | |
6536 | ||
3f294f4f | 6537 | static ssize_t |
fd01b88c | 6538 | stripe_cache_active_show(struct mddev *mddev, char *page) |
3f294f4f | 6539 | { |
d1688a6d | 6540 | struct r5conf *conf = mddev->private; |
96de1e66 N |
6541 | if (conf) |
6542 | return sprintf(page, "%d\n", atomic_read(&conf->active_stripes)); | |
6543 | else | |
6544 | return 0; | |
3f294f4f N |
6545 | } |
6546 | ||
96de1e66 N |
6547 | static struct md_sysfs_entry |
6548 | raid5_stripecache_active = __ATTR_RO(stripe_cache_active); | |
3f294f4f | 6549 | |
b721420e SL |
6550 | static ssize_t |
6551 | raid5_show_group_thread_cnt(struct mddev *mddev, char *page) | |
6552 | { | |
7b1485ba N |
6553 | struct r5conf *conf; |
6554 | int ret = 0; | |
6555 | spin_lock(&mddev->lock); | |
6556 | conf = mddev->private; | |
b721420e | 6557 | if (conf) |
7b1485ba N |
6558 | ret = sprintf(page, "%d\n", conf->worker_cnt_per_group); |
6559 | spin_unlock(&mddev->lock); | |
6560 | return ret; | |
b721420e SL |
6561 | } |
6562 | ||
60aaf933 | 6563 | static int alloc_thread_groups(struct r5conf *conf, int cnt, |
6564 | int *group_cnt, | |
6565 | int *worker_cnt_per_group, | |
6566 | struct r5worker_group **worker_groups); | |
b721420e SL |
6567 | static ssize_t |
6568 | raid5_store_group_thread_cnt(struct mddev *mddev, const char *page, size_t len) | |
6569 | { | |
6791875e | 6570 | struct r5conf *conf; |
b721420e SL |
6571 | unsigned long new; |
6572 | int err; | |
60aaf933 | 6573 | struct r5worker_group *new_groups, *old_groups; |
6574 | int group_cnt, worker_cnt_per_group; | |
b721420e SL |
6575 | |
6576 | if (len >= PAGE_SIZE) | |
6577 | return -EINVAL; | |
b721420e SL |
6578 | if (kstrtoul(page, 10, &new)) |
6579 | return -EINVAL; | |
6580 | ||
6791875e N |
6581 | err = mddev_lock(mddev); |
6582 | if (err) | |
6583 | return err; | |
6584 | conf = mddev->private; | |
6585 | if (!conf) | |
6586 | err = -ENODEV; | |
6587 | else if (new != conf->worker_cnt_per_group) { | |
6588 | mddev_suspend(mddev); | |
b721420e | 6589 | |
6791875e N |
6590 | old_groups = conf->worker_groups; |
6591 | if (old_groups) | |
6592 | flush_workqueue(raid5_wq); | |
d206dcfa | 6593 | |
6791875e N |
6594 | err = alloc_thread_groups(conf, new, |
6595 | &group_cnt, &worker_cnt_per_group, | |
6596 | &new_groups); | |
6597 | if (!err) { | |
6598 | spin_lock_irq(&conf->device_lock); | |
6599 | conf->group_cnt = group_cnt; | |
6600 | conf->worker_cnt_per_group = worker_cnt_per_group; | |
6601 | conf->worker_groups = new_groups; | |
6602 | spin_unlock_irq(&conf->device_lock); | |
b721420e | 6603 | |
6791875e N |
6604 | if (old_groups) |
6605 | kfree(old_groups[0].workers); | |
6606 | kfree(old_groups); | |
6607 | } | |
6608 | mddev_resume(mddev); | |
b721420e | 6609 | } |
6791875e | 6610 | mddev_unlock(mddev); |
b721420e | 6611 | |
6791875e | 6612 | return err ?: len; |
b721420e SL |
6613 | } |
6614 | ||
6615 | static struct md_sysfs_entry | |
6616 | raid5_group_thread_cnt = __ATTR(group_thread_cnt, S_IRUGO | S_IWUSR, | |
6617 | raid5_show_group_thread_cnt, | |
6618 | raid5_store_group_thread_cnt); | |
6619 | ||
007583c9 | 6620 | static struct attribute *raid5_attrs[] = { |
3f294f4f N |
6621 | &raid5_stripecache_size.attr, |
6622 | &raid5_stripecache_active.attr, | |
8b3e6cdc | 6623 | &raid5_preread_bypass_threshold.attr, |
b721420e | 6624 | &raid5_group_thread_cnt.attr, |
d592a996 | 6625 | &raid5_skip_copy.attr, |
d06f191f | 6626 | &raid5_rmw_level.attr, |
2c7da14b | 6627 | &r5c_journal_mode.attr, |
3f294f4f N |
6628 | NULL, |
6629 | }; | |
007583c9 N |
6630 | static struct attribute_group raid5_attrs_group = { |
6631 | .name = NULL, | |
6632 | .attrs = raid5_attrs, | |
3f294f4f N |
6633 | }; |
6634 | ||
60aaf933 | 6635 | static int alloc_thread_groups(struct r5conf *conf, int cnt, |
6636 | int *group_cnt, | |
6637 | int *worker_cnt_per_group, | |
6638 | struct r5worker_group **worker_groups) | |
851c30c9 | 6639 | { |
566c09c5 | 6640 | int i, j, k; |
851c30c9 SL |
6641 | ssize_t size; |
6642 | struct r5worker *workers; | |
6643 | ||
60aaf933 | 6644 | *worker_cnt_per_group = cnt; |
851c30c9 | 6645 | if (cnt == 0) { |
60aaf933 | 6646 | *group_cnt = 0; |
6647 | *worker_groups = NULL; | |
851c30c9 SL |
6648 | return 0; |
6649 | } | |
60aaf933 | 6650 | *group_cnt = num_possible_nodes(); |
851c30c9 | 6651 | size = sizeof(struct r5worker) * cnt; |
60aaf933 | 6652 | workers = kzalloc(size * *group_cnt, GFP_NOIO); |
6653 | *worker_groups = kzalloc(sizeof(struct r5worker_group) * | |
6654 | *group_cnt, GFP_NOIO); | |
6655 | if (!*worker_groups || !workers) { | |
851c30c9 | 6656 | kfree(workers); |
60aaf933 | 6657 | kfree(*worker_groups); |
851c30c9 SL |
6658 | return -ENOMEM; |
6659 | } | |
6660 | ||
60aaf933 | 6661 | for (i = 0; i < *group_cnt; i++) { |
851c30c9 SL |
6662 | struct r5worker_group *group; |
6663 | ||
0c775d52 | 6664 | group = &(*worker_groups)[i]; |
851c30c9 | 6665 | INIT_LIST_HEAD(&group->handle_list); |
535ae4eb | 6666 | INIT_LIST_HEAD(&group->loprio_list); |
851c30c9 SL |
6667 | group->conf = conf; |
6668 | group->workers = workers + i * cnt; | |
6669 | ||
6670 | for (j = 0; j < cnt; j++) { | |
566c09c5 SL |
6671 | struct r5worker *worker = group->workers + j; |
6672 | worker->group = group; | |
6673 | INIT_WORK(&worker->work, raid5_do_work); | |
6674 | ||
6675 | for (k = 0; k < NR_STRIPE_HASH_LOCKS; k++) | |
6676 | INIT_LIST_HEAD(worker->temp_inactive_list + k); | |
851c30c9 SL |
6677 | } |
6678 | } | |
6679 | ||
6680 | return 0; | |
6681 | } | |
6682 | ||
6683 | static void free_thread_groups(struct r5conf *conf) | |
6684 | { | |
6685 | if (conf->worker_groups) | |
6686 | kfree(conf->worker_groups[0].workers); | |
6687 | kfree(conf->worker_groups); | |
6688 | conf->worker_groups = NULL; | |
6689 | } | |
6690 | ||
80c3a6ce | 6691 | static sector_t |
fd01b88c | 6692 | raid5_size(struct mddev *mddev, sector_t sectors, int raid_disks) |
80c3a6ce | 6693 | { |
d1688a6d | 6694 | struct r5conf *conf = mddev->private; |
80c3a6ce DW |
6695 | |
6696 | if (!sectors) | |
6697 | sectors = mddev->dev_sectors; | |
5e5e3e78 | 6698 | if (!raid_disks) |
7ec05478 | 6699 | /* size is defined by the smallest of previous and new size */ |
5e5e3e78 | 6700 | raid_disks = min(conf->raid_disks, conf->previous_raid_disks); |
80c3a6ce | 6701 | |
3cb5edf4 N |
6702 | sectors &= ~((sector_t)conf->chunk_sectors - 1); |
6703 | sectors &= ~((sector_t)conf->prev_chunk_sectors - 1); | |
80c3a6ce DW |
6704 | return sectors * (raid_disks - conf->max_degraded); |
6705 | } | |
6706 | ||
789b5e03 ON |
6707 | static void free_scratch_buffer(struct r5conf *conf, struct raid5_percpu *percpu) |
6708 | { | |
6709 | safe_put_page(percpu->spare_page); | |
46d5b785 | 6710 | if (percpu->scribble) |
6711 | flex_array_free(percpu->scribble); | |
789b5e03 ON |
6712 | percpu->spare_page = NULL; |
6713 | percpu->scribble = NULL; | |
6714 | } | |
6715 | ||
6716 | static int alloc_scratch_buffer(struct r5conf *conf, struct raid5_percpu *percpu) | |
6717 | { | |
6718 | if (conf->level == 6 && !percpu->spare_page) | |
6719 | percpu->spare_page = alloc_page(GFP_KERNEL); | |
6720 | if (!percpu->scribble) | |
46d5b785 | 6721 | percpu->scribble = scribble_alloc(max(conf->raid_disks, |
738a2738 N |
6722 | conf->previous_raid_disks), |
6723 | max(conf->chunk_sectors, | |
6724 | conf->prev_chunk_sectors) | |
6725 | / STRIPE_SECTORS, | |
6726 | GFP_KERNEL); | |
789b5e03 ON |
6727 | |
6728 | if (!percpu->scribble || (conf->level == 6 && !percpu->spare_page)) { | |
6729 | free_scratch_buffer(conf, percpu); | |
6730 | return -ENOMEM; | |
6731 | } | |
6732 | ||
6733 | return 0; | |
6734 | } | |
6735 | ||
29c6d1bb | 6736 | static int raid456_cpu_dead(unsigned int cpu, struct hlist_node *node) |
36d1c647 | 6737 | { |
29c6d1bb SAS |
6738 | struct r5conf *conf = hlist_entry_safe(node, struct r5conf, node); |
6739 | ||
6740 | free_scratch_buffer(conf, per_cpu_ptr(conf->percpu, cpu)); | |
6741 | return 0; | |
6742 | } | |
36d1c647 | 6743 | |
29c6d1bb SAS |
6744 | static void raid5_free_percpu(struct r5conf *conf) |
6745 | { | |
36d1c647 DW |
6746 | if (!conf->percpu) |
6747 | return; | |
6748 | ||
29c6d1bb | 6749 | cpuhp_state_remove_instance(CPUHP_MD_RAID5_PREPARE, &conf->node); |
36d1c647 DW |
6750 | free_percpu(conf->percpu); |
6751 | } | |
6752 | ||
d1688a6d | 6753 | static void free_conf(struct r5conf *conf) |
95fc17aa | 6754 | { |
d7bd398e SL |
6755 | int i; |
6756 | ||
ff875738 AP |
6757 | log_exit(conf); |
6758 | ||
30c89465 | 6759 | if (conf->shrinker.nr_deferred) |
edbe83ab | 6760 | unregister_shrinker(&conf->shrinker); |
5c7e81c3 | 6761 | |
851c30c9 | 6762 | free_thread_groups(conf); |
95fc17aa | 6763 | shrink_stripes(conf); |
36d1c647 | 6764 | raid5_free_percpu(conf); |
d7bd398e SL |
6765 | for (i = 0; i < conf->pool_size; i++) |
6766 | if (conf->disks[i].extra_page) | |
6767 | put_page(conf->disks[i].extra_page); | |
95fc17aa DW |
6768 | kfree(conf->disks); |
6769 | kfree(conf->stripe_hashtbl); | |
aaf9f12e | 6770 | kfree(conf->pending_data); |
95fc17aa DW |
6771 | kfree(conf); |
6772 | } | |
6773 | ||
29c6d1bb | 6774 | static int raid456_cpu_up_prepare(unsigned int cpu, struct hlist_node *node) |
36d1c647 | 6775 | { |
29c6d1bb | 6776 | struct r5conf *conf = hlist_entry_safe(node, struct r5conf, node); |
36d1c647 DW |
6777 | struct raid5_percpu *percpu = per_cpu_ptr(conf->percpu, cpu); |
6778 | ||
29c6d1bb | 6779 | if (alloc_scratch_buffer(conf, percpu)) { |
cc6167b4 N |
6780 | pr_warn("%s: failed memory allocation for cpu%u\n", |
6781 | __func__, cpu); | |
29c6d1bb | 6782 | return -ENOMEM; |
36d1c647 | 6783 | } |
29c6d1bb | 6784 | return 0; |
36d1c647 | 6785 | } |
36d1c647 | 6786 | |
d1688a6d | 6787 | static int raid5_alloc_percpu(struct r5conf *conf) |
36d1c647 | 6788 | { |
789b5e03 | 6789 | int err = 0; |
36d1c647 | 6790 | |
789b5e03 ON |
6791 | conf->percpu = alloc_percpu(struct raid5_percpu); |
6792 | if (!conf->percpu) | |
36d1c647 | 6793 | return -ENOMEM; |
789b5e03 | 6794 | |
29c6d1bb | 6795 | err = cpuhp_state_add_instance(CPUHP_MD_RAID5_PREPARE, &conf->node); |
27a353c0 SL |
6796 | if (!err) { |
6797 | conf->scribble_disks = max(conf->raid_disks, | |
6798 | conf->previous_raid_disks); | |
6799 | conf->scribble_sectors = max(conf->chunk_sectors, | |
6800 | conf->prev_chunk_sectors); | |
6801 | } | |
36d1c647 DW |
6802 | return err; |
6803 | } | |
6804 | ||
edbe83ab N |
6805 | static unsigned long raid5_cache_scan(struct shrinker *shrink, |
6806 | struct shrink_control *sc) | |
6807 | { | |
6808 | struct r5conf *conf = container_of(shrink, struct r5conf, shrinker); | |
2d5b569b N |
6809 | unsigned long ret = SHRINK_STOP; |
6810 | ||
6811 | if (mutex_trylock(&conf->cache_size_mutex)) { | |
6812 | ret= 0; | |
49895bcc N |
6813 | while (ret < sc->nr_to_scan && |
6814 | conf->max_nr_stripes > conf->min_nr_stripes) { | |
2d5b569b N |
6815 | if (drop_one_stripe(conf) == 0) { |
6816 | ret = SHRINK_STOP; | |
6817 | break; | |
6818 | } | |
6819 | ret++; | |
6820 | } | |
6821 | mutex_unlock(&conf->cache_size_mutex); | |
edbe83ab N |
6822 | } |
6823 | return ret; | |
6824 | } | |
6825 | ||
6826 | static unsigned long raid5_cache_count(struct shrinker *shrink, | |
6827 | struct shrink_control *sc) | |
6828 | { | |
6829 | struct r5conf *conf = container_of(shrink, struct r5conf, shrinker); | |
6830 | ||
6831 | if (conf->max_nr_stripes < conf->min_nr_stripes) | |
6832 | /* unlikely, but not impossible */ | |
6833 | return 0; | |
6834 | return conf->max_nr_stripes - conf->min_nr_stripes; | |
6835 | } | |
6836 | ||
d1688a6d | 6837 | static struct r5conf *setup_conf(struct mddev *mddev) |
1da177e4 | 6838 | { |
d1688a6d | 6839 | struct r5conf *conf; |
5e5e3e78 | 6840 | int raid_disk, memory, max_disks; |
3cb03002 | 6841 | struct md_rdev *rdev; |
1da177e4 | 6842 | struct disk_info *disk; |
0232605d | 6843 | char pers_name[6]; |
566c09c5 | 6844 | int i; |
60aaf933 | 6845 | int group_cnt, worker_cnt_per_group; |
6846 | struct r5worker_group *new_group; | |
1da177e4 | 6847 | |
91adb564 N |
6848 | if (mddev->new_level != 5 |
6849 | && mddev->new_level != 4 | |
6850 | && mddev->new_level != 6) { | |
cc6167b4 N |
6851 | pr_warn("md/raid:%s: raid level not set to 4/5/6 (%d)\n", |
6852 | mdname(mddev), mddev->new_level); | |
91adb564 | 6853 | return ERR_PTR(-EIO); |
1da177e4 | 6854 | } |
91adb564 N |
6855 | if ((mddev->new_level == 5 |
6856 | && !algorithm_valid_raid5(mddev->new_layout)) || | |
6857 | (mddev->new_level == 6 | |
6858 | && !algorithm_valid_raid6(mddev->new_layout))) { | |
cc6167b4 N |
6859 | pr_warn("md/raid:%s: layout %d not supported\n", |
6860 | mdname(mddev), mddev->new_layout); | |
91adb564 | 6861 | return ERR_PTR(-EIO); |
99c0fb5f | 6862 | } |
91adb564 | 6863 | if (mddev->new_level == 6 && mddev->raid_disks < 4) { |
cc6167b4 N |
6864 | pr_warn("md/raid:%s: not enough configured devices (%d, minimum 4)\n", |
6865 | mdname(mddev), mddev->raid_disks); | |
91adb564 | 6866 | return ERR_PTR(-EINVAL); |
4bbf3771 N |
6867 | } |
6868 | ||
664e7c41 AN |
6869 | if (!mddev->new_chunk_sectors || |
6870 | (mddev->new_chunk_sectors << 9) % PAGE_SIZE || | |
6871 | !is_power_of_2(mddev->new_chunk_sectors)) { | |
cc6167b4 N |
6872 | pr_warn("md/raid:%s: invalid chunk size %d\n", |
6873 | mdname(mddev), mddev->new_chunk_sectors << 9); | |
91adb564 | 6874 | return ERR_PTR(-EINVAL); |
f6705578 N |
6875 | } |
6876 | ||
d1688a6d | 6877 | conf = kzalloc(sizeof(struct r5conf), GFP_KERNEL); |
91adb564 | 6878 | if (conf == NULL) |
1da177e4 | 6879 | goto abort; |
aaf9f12e SL |
6880 | INIT_LIST_HEAD(&conf->free_list); |
6881 | INIT_LIST_HEAD(&conf->pending_list); | |
6882 | conf->pending_data = kzalloc(sizeof(struct r5pending_data) * | |
6883 | PENDING_IO_MAX, GFP_KERNEL); | |
6884 | if (!conf->pending_data) | |
6885 | goto abort; | |
6886 | for (i = 0; i < PENDING_IO_MAX; i++) | |
6887 | list_add(&conf->pending_data[i].sibling, &conf->free_list); | |
851c30c9 | 6888 | /* Don't enable multi-threading by default*/ |
60aaf933 | 6889 | if (!alloc_thread_groups(conf, 0, &group_cnt, &worker_cnt_per_group, |
6890 | &new_group)) { | |
6891 | conf->group_cnt = group_cnt; | |
6892 | conf->worker_cnt_per_group = worker_cnt_per_group; | |
6893 | conf->worker_groups = new_group; | |
6894 | } else | |
851c30c9 | 6895 | goto abort; |
f5efd45a | 6896 | spin_lock_init(&conf->device_lock); |
c46501b2 | 6897 | seqcount_init(&conf->gen_lock); |
2d5b569b | 6898 | mutex_init(&conf->cache_size_mutex); |
b1b46486 | 6899 | init_waitqueue_head(&conf->wait_for_quiescent); |
6ab2a4b8 | 6900 | init_waitqueue_head(&conf->wait_for_stripe); |
f5efd45a DW |
6901 | init_waitqueue_head(&conf->wait_for_overlap); |
6902 | INIT_LIST_HEAD(&conf->handle_list); | |
535ae4eb | 6903 | INIT_LIST_HEAD(&conf->loprio_list); |
f5efd45a DW |
6904 | INIT_LIST_HEAD(&conf->hold_list); |
6905 | INIT_LIST_HEAD(&conf->delayed_list); | |
6906 | INIT_LIST_HEAD(&conf->bitmap_list); | |
773ca82f | 6907 | init_llist_head(&conf->released_stripes); |
f5efd45a DW |
6908 | atomic_set(&conf->active_stripes, 0); |
6909 | atomic_set(&conf->preread_active_stripes, 0); | |
6910 | atomic_set(&conf->active_aligned_reads, 0); | |
765d704d SL |
6911 | spin_lock_init(&conf->pending_bios_lock); |
6912 | conf->batch_bio_dispatch = true; | |
6913 | rdev_for_each(rdev, mddev) { | |
6914 | if (test_bit(Journal, &rdev->flags)) | |
6915 | continue; | |
6916 | if (blk_queue_nonrot(bdev_get_queue(rdev->bdev))) { | |
6917 | conf->batch_bio_dispatch = false; | |
6918 | break; | |
6919 | } | |
6920 | } | |
6921 | ||
f5efd45a | 6922 | conf->bypass_threshold = BYPASS_THRESHOLD; |
d890fa2b | 6923 | conf->recovery_disabled = mddev->recovery_disabled - 1; |
91adb564 N |
6924 | |
6925 | conf->raid_disks = mddev->raid_disks; | |
6926 | if (mddev->reshape_position == MaxSector) | |
6927 | conf->previous_raid_disks = mddev->raid_disks; | |
6928 | else | |
f6705578 | 6929 | conf->previous_raid_disks = mddev->raid_disks - mddev->delta_disks; |
5e5e3e78 | 6930 | max_disks = max(conf->raid_disks, conf->previous_raid_disks); |
f6705578 | 6931 | |
5e5e3e78 | 6932 | conf->disks = kzalloc(max_disks * sizeof(struct disk_info), |
b55e6bfc | 6933 | GFP_KERNEL); |
d7bd398e | 6934 | |
b55e6bfc N |
6935 | if (!conf->disks) |
6936 | goto abort; | |
9ffae0cf | 6937 | |
d7bd398e SL |
6938 | for (i = 0; i < max_disks; i++) { |
6939 | conf->disks[i].extra_page = alloc_page(GFP_KERNEL); | |
6940 | if (!conf->disks[i].extra_page) | |
6941 | goto abort; | |
6942 | } | |
6943 | ||
1da177e4 LT |
6944 | conf->mddev = mddev; |
6945 | ||
fccddba0 | 6946 | if ((conf->stripe_hashtbl = kzalloc(PAGE_SIZE, GFP_KERNEL)) == NULL) |
1da177e4 | 6947 | goto abort; |
1da177e4 | 6948 | |
566c09c5 SL |
6949 | /* We init hash_locks[0] separately to that it can be used |
6950 | * as the reference lock in the spin_lock_nest_lock() call | |
6951 | * in lock_all_device_hash_locks_irq in order to convince | |
6952 | * lockdep that we know what we are doing. | |
6953 | */ | |
6954 | spin_lock_init(conf->hash_locks); | |
6955 | for (i = 1; i < NR_STRIPE_HASH_LOCKS; i++) | |
6956 | spin_lock_init(conf->hash_locks + i); | |
6957 | ||
6958 | for (i = 0; i < NR_STRIPE_HASH_LOCKS; i++) | |
6959 | INIT_LIST_HEAD(conf->inactive_list + i); | |
6960 | ||
6961 | for (i = 0; i < NR_STRIPE_HASH_LOCKS; i++) | |
6962 | INIT_LIST_HEAD(conf->temp_inactive_list + i); | |
6963 | ||
1e6d690b SL |
6964 | atomic_set(&conf->r5c_cached_full_stripes, 0); |
6965 | INIT_LIST_HEAD(&conf->r5c_full_stripe_list); | |
6966 | atomic_set(&conf->r5c_cached_partial_stripes, 0); | |
6967 | INIT_LIST_HEAD(&conf->r5c_partial_stripe_list); | |
e33fbb9c SL |
6968 | atomic_set(&conf->r5c_flushing_full_stripes, 0); |
6969 | atomic_set(&conf->r5c_flushing_partial_stripes, 0); | |
1e6d690b | 6970 | |
36d1c647 | 6971 | conf->level = mddev->new_level; |
46d5b785 | 6972 | conf->chunk_sectors = mddev->new_chunk_sectors; |
36d1c647 DW |
6973 | if (raid5_alloc_percpu(conf) != 0) |
6974 | goto abort; | |
6975 | ||
0c55e022 | 6976 | pr_debug("raid456: run(%s) called.\n", mdname(mddev)); |
1da177e4 | 6977 | |
dafb20fa | 6978 | rdev_for_each(rdev, mddev) { |
1da177e4 | 6979 | raid_disk = rdev->raid_disk; |
5e5e3e78 | 6980 | if (raid_disk >= max_disks |
f2076e7d | 6981 | || raid_disk < 0 || test_bit(Journal, &rdev->flags)) |
1da177e4 LT |
6982 | continue; |
6983 | disk = conf->disks + raid_disk; | |
6984 | ||
17045f52 N |
6985 | if (test_bit(Replacement, &rdev->flags)) { |
6986 | if (disk->replacement) | |
6987 | goto abort; | |
6988 | disk->replacement = rdev; | |
6989 | } else { | |
6990 | if (disk->rdev) | |
6991 | goto abort; | |
6992 | disk->rdev = rdev; | |
6993 | } | |
1da177e4 | 6994 | |
b2d444d7 | 6995 | if (test_bit(In_sync, &rdev->flags)) { |
1da177e4 | 6996 | char b[BDEVNAME_SIZE]; |
cc6167b4 N |
6997 | pr_info("md/raid:%s: device %s operational as raid disk %d\n", |
6998 | mdname(mddev), bdevname(rdev->bdev, b), raid_disk); | |
d6b212f4 | 6999 | } else if (rdev->saved_raid_disk != raid_disk) |
8c2e870a NB |
7000 | /* Cannot rely on bitmap to complete recovery */ |
7001 | conf->fullsync = 1; | |
1da177e4 LT |
7002 | } |
7003 | ||
91adb564 | 7004 | conf->level = mddev->new_level; |
584acdd4 | 7005 | if (conf->level == 6) { |
16a53ecc | 7006 | conf->max_degraded = 2; |
584acdd4 MS |
7007 | if (raid6_call.xor_syndrome) |
7008 | conf->rmw_level = PARITY_ENABLE_RMW; | |
7009 | else | |
7010 | conf->rmw_level = PARITY_DISABLE_RMW; | |
7011 | } else { | |
16a53ecc | 7012 | conf->max_degraded = 1; |
584acdd4 MS |
7013 | conf->rmw_level = PARITY_ENABLE_RMW; |
7014 | } | |
91adb564 | 7015 | conf->algorithm = mddev->new_layout; |
fef9c61f | 7016 | conf->reshape_progress = mddev->reshape_position; |
e183eaed | 7017 | if (conf->reshape_progress != MaxSector) { |
09c9e5fa | 7018 | conf->prev_chunk_sectors = mddev->chunk_sectors; |
e183eaed | 7019 | conf->prev_algo = mddev->layout; |
5cac6bcb N |
7020 | } else { |
7021 | conf->prev_chunk_sectors = conf->chunk_sectors; | |
7022 | conf->prev_algo = conf->algorithm; | |
e183eaed | 7023 | } |
1da177e4 | 7024 | |
edbe83ab | 7025 | conf->min_nr_stripes = NR_STRIPES; |
ad5b0f76 SL |
7026 | if (mddev->reshape_position != MaxSector) { |
7027 | int stripes = max_t(int, | |
7028 | ((mddev->chunk_sectors << 9) / STRIPE_SIZE) * 4, | |
7029 | ((mddev->new_chunk_sectors << 9) / STRIPE_SIZE) * 4); | |
7030 | conf->min_nr_stripes = max(NR_STRIPES, stripes); | |
7031 | if (conf->min_nr_stripes != NR_STRIPES) | |
cc6167b4 | 7032 | pr_info("md/raid:%s: force stripe size %d for reshape\n", |
ad5b0f76 SL |
7033 | mdname(mddev), conf->min_nr_stripes); |
7034 | } | |
edbe83ab | 7035 | memory = conf->min_nr_stripes * (sizeof(struct stripe_head) + |
5e5e3e78 | 7036 | max_disks * ((sizeof(struct bio) + PAGE_SIZE))) / 1024; |
4bda556a | 7037 | atomic_set(&conf->empty_inactive_list_nr, NR_STRIPE_HASH_LOCKS); |
edbe83ab | 7038 | if (grow_stripes(conf, conf->min_nr_stripes)) { |
cc6167b4 N |
7039 | pr_warn("md/raid:%s: couldn't allocate %dkB for buffers\n", |
7040 | mdname(mddev), memory); | |
91adb564 N |
7041 | goto abort; |
7042 | } else | |
cc6167b4 | 7043 | pr_debug("md/raid:%s: allocated %dkB\n", mdname(mddev), memory); |
edbe83ab N |
7044 | /* |
7045 | * Losing a stripe head costs more than the time to refill it, | |
7046 | * it reduces the queue depth and so can hurt throughput. | |
7047 | * So set it rather large, scaled by number of devices. | |
7048 | */ | |
7049 | conf->shrinker.seeks = DEFAULT_SEEKS * conf->raid_disks * 4; | |
7050 | conf->shrinker.scan_objects = raid5_cache_scan; | |
7051 | conf->shrinker.count_objects = raid5_cache_count; | |
7052 | conf->shrinker.batch = 128; | |
7053 | conf->shrinker.flags = 0; | |
6a0f53ff | 7054 | if (register_shrinker(&conf->shrinker)) { |
cc6167b4 N |
7055 | pr_warn("md/raid:%s: couldn't register shrinker.\n", |
7056 | mdname(mddev)); | |
6a0f53ff CY |
7057 | goto abort; |
7058 | } | |
1da177e4 | 7059 | |
0232605d N |
7060 | sprintf(pers_name, "raid%d", mddev->new_level); |
7061 | conf->thread = md_register_thread(raid5d, mddev, pers_name); | |
91adb564 | 7062 | if (!conf->thread) { |
cc6167b4 N |
7063 | pr_warn("md/raid:%s: couldn't allocate thread.\n", |
7064 | mdname(mddev)); | |
16a53ecc N |
7065 | goto abort; |
7066 | } | |
91adb564 N |
7067 | |
7068 | return conf; | |
7069 | ||
7070 | abort: | |
7071 | if (conf) { | |
95fc17aa | 7072 | free_conf(conf); |
91adb564 N |
7073 | return ERR_PTR(-EIO); |
7074 | } else | |
7075 | return ERR_PTR(-ENOMEM); | |
7076 | } | |
7077 | ||
c148ffdc N |
7078 | static int only_parity(int raid_disk, int algo, int raid_disks, int max_degraded) |
7079 | { | |
7080 | switch (algo) { | |
7081 | case ALGORITHM_PARITY_0: | |
7082 | if (raid_disk < max_degraded) | |
7083 | return 1; | |
7084 | break; | |
7085 | case ALGORITHM_PARITY_N: | |
7086 | if (raid_disk >= raid_disks - max_degraded) | |
7087 | return 1; | |
7088 | break; | |
7089 | case ALGORITHM_PARITY_0_6: | |
f72ffdd6 | 7090 | if (raid_disk == 0 || |
c148ffdc N |
7091 | raid_disk == raid_disks - 1) |
7092 | return 1; | |
7093 | break; | |
7094 | case ALGORITHM_LEFT_ASYMMETRIC_6: | |
7095 | case ALGORITHM_RIGHT_ASYMMETRIC_6: | |
7096 | case ALGORITHM_LEFT_SYMMETRIC_6: | |
7097 | case ALGORITHM_RIGHT_SYMMETRIC_6: | |
7098 | if (raid_disk == raid_disks - 1) | |
7099 | return 1; | |
7100 | } | |
7101 | return 0; | |
7102 | } | |
7103 | ||
849674e4 | 7104 | static int raid5_run(struct mddev *mddev) |
91adb564 | 7105 | { |
d1688a6d | 7106 | struct r5conf *conf; |
9f7c2220 | 7107 | int working_disks = 0; |
c148ffdc | 7108 | int dirty_parity_disks = 0; |
3cb03002 | 7109 | struct md_rdev *rdev; |
713cf5a6 | 7110 | struct md_rdev *journal_dev = NULL; |
c148ffdc | 7111 | sector_t reshape_offset = 0; |
17045f52 | 7112 | int i; |
b5254dd5 N |
7113 | long long min_offset_diff = 0; |
7114 | int first = 1; | |
91adb564 | 7115 | |
8c6ac868 | 7116 | if (mddev->recovery_cp != MaxSector) |
cc6167b4 N |
7117 | pr_notice("md/raid:%s: not clean -- starting background reconstruction\n", |
7118 | mdname(mddev)); | |
b5254dd5 N |
7119 | |
7120 | rdev_for_each(rdev, mddev) { | |
7121 | long long diff; | |
713cf5a6 | 7122 | |
f2076e7d | 7123 | if (test_bit(Journal, &rdev->flags)) { |
713cf5a6 | 7124 | journal_dev = rdev; |
f2076e7d SL |
7125 | continue; |
7126 | } | |
b5254dd5 N |
7127 | if (rdev->raid_disk < 0) |
7128 | continue; | |
7129 | diff = (rdev->new_data_offset - rdev->data_offset); | |
7130 | if (first) { | |
7131 | min_offset_diff = diff; | |
7132 | first = 0; | |
7133 | } else if (mddev->reshape_backwards && | |
7134 | diff < min_offset_diff) | |
7135 | min_offset_diff = diff; | |
7136 | else if (!mddev->reshape_backwards && | |
7137 | diff > min_offset_diff) | |
7138 | min_offset_diff = diff; | |
7139 | } | |
7140 | ||
91adb564 N |
7141 | if (mddev->reshape_position != MaxSector) { |
7142 | /* Check that we can continue the reshape. | |
b5254dd5 N |
7143 | * Difficulties arise if the stripe we would write to |
7144 | * next is at or after the stripe we would read from next. | |
7145 | * For a reshape that changes the number of devices, this | |
7146 | * is only possible for a very short time, and mdadm makes | |
7147 | * sure that time appears to have past before assembling | |
7148 | * the array. So we fail if that time hasn't passed. | |
7149 | * For a reshape that keeps the number of devices the same | |
7150 | * mdadm must be monitoring the reshape can keeping the | |
7151 | * critical areas read-only and backed up. It will start | |
7152 | * the array in read-only mode, so we check for that. | |
91adb564 N |
7153 | */ |
7154 | sector_t here_new, here_old; | |
7155 | int old_disks; | |
18b00334 | 7156 | int max_degraded = (mddev->level == 6 ? 2 : 1); |
05256d98 N |
7157 | int chunk_sectors; |
7158 | int new_data_disks; | |
91adb564 | 7159 | |
713cf5a6 | 7160 | if (journal_dev) { |
cc6167b4 N |
7161 | pr_warn("md/raid:%s: don't support reshape with journal - aborting.\n", |
7162 | mdname(mddev)); | |
713cf5a6 SL |
7163 | return -EINVAL; |
7164 | } | |
7165 | ||
88ce4930 | 7166 | if (mddev->new_level != mddev->level) { |
cc6167b4 N |
7167 | pr_warn("md/raid:%s: unsupported reshape required - aborting.\n", |
7168 | mdname(mddev)); | |
91adb564 N |
7169 | return -EINVAL; |
7170 | } | |
91adb564 N |
7171 | old_disks = mddev->raid_disks - mddev->delta_disks; |
7172 | /* reshape_position must be on a new-stripe boundary, and one | |
7173 | * further up in new geometry must map after here in old | |
7174 | * geometry. | |
05256d98 N |
7175 | * If the chunk sizes are different, then as we perform reshape |
7176 | * in units of the largest of the two, reshape_position needs | |
7177 | * be a multiple of the largest chunk size times new data disks. | |
91adb564 N |
7178 | */ |
7179 | here_new = mddev->reshape_position; | |
05256d98 N |
7180 | chunk_sectors = max(mddev->chunk_sectors, mddev->new_chunk_sectors); |
7181 | new_data_disks = mddev->raid_disks - max_degraded; | |
7182 | if (sector_div(here_new, chunk_sectors * new_data_disks)) { | |
cc6167b4 N |
7183 | pr_warn("md/raid:%s: reshape_position not on a stripe boundary\n", |
7184 | mdname(mddev)); | |
91adb564 N |
7185 | return -EINVAL; |
7186 | } | |
05256d98 | 7187 | reshape_offset = here_new * chunk_sectors; |
91adb564 N |
7188 | /* here_new is the stripe we will write to */ |
7189 | here_old = mddev->reshape_position; | |
05256d98 | 7190 | sector_div(here_old, chunk_sectors * (old_disks-max_degraded)); |
91adb564 N |
7191 | /* here_old is the first stripe that we might need to read |
7192 | * from */ | |
67ac6011 N |
7193 | if (mddev->delta_disks == 0) { |
7194 | /* We cannot be sure it is safe to start an in-place | |
b5254dd5 | 7195 | * reshape. It is only safe if user-space is monitoring |
67ac6011 N |
7196 | * and taking constant backups. |
7197 | * mdadm always starts a situation like this in | |
7198 | * readonly mode so it can take control before | |
7199 | * allowing any writes. So just check for that. | |
7200 | */ | |
b5254dd5 N |
7201 | if (abs(min_offset_diff) >= mddev->chunk_sectors && |
7202 | abs(min_offset_diff) >= mddev->new_chunk_sectors) | |
7203 | /* not really in-place - so OK */; | |
7204 | else if (mddev->ro == 0) { | |
cc6167b4 N |
7205 | pr_warn("md/raid:%s: in-place reshape must be started in read-only mode - aborting\n", |
7206 | mdname(mddev)); | |
67ac6011 N |
7207 | return -EINVAL; |
7208 | } | |
2c810cdd | 7209 | } else if (mddev->reshape_backwards |
05256d98 N |
7210 | ? (here_new * chunk_sectors + min_offset_diff <= |
7211 | here_old * chunk_sectors) | |
7212 | : (here_new * chunk_sectors >= | |
7213 | here_old * chunk_sectors + (-min_offset_diff))) { | |
91adb564 | 7214 | /* Reading from the same stripe as writing to - bad */ |
cc6167b4 N |
7215 | pr_warn("md/raid:%s: reshape_position too early for auto-recovery - aborting.\n", |
7216 | mdname(mddev)); | |
91adb564 N |
7217 | return -EINVAL; |
7218 | } | |
cc6167b4 | 7219 | pr_debug("md/raid:%s: reshape will continue\n", mdname(mddev)); |
91adb564 N |
7220 | /* OK, we should be able to continue; */ |
7221 | } else { | |
7222 | BUG_ON(mddev->level != mddev->new_level); | |
7223 | BUG_ON(mddev->layout != mddev->new_layout); | |
664e7c41 | 7224 | BUG_ON(mddev->chunk_sectors != mddev->new_chunk_sectors); |
91adb564 | 7225 | BUG_ON(mddev->delta_disks != 0); |
1da177e4 | 7226 | } |
91adb564 | 7227 | |
3418d036 AP |
7228 | if (test_bit(MD_HAS_JOURNAL, &mddev->flags) && |
7229 | test_bit(MD_HAS_PPL, &mddev->flags)) { | |
7230 | pr_warn("md/raid:%s: using journal device and PPL not allowed - disabling PPL\n", | |
7231 | mdname(mddev)); | |
7232 | clear_bit(MD_HAS_PPL, &mddev->flags); | |
7233 | } | |
7234 | ||
245f46c2 N |
7235 | if (mddev->private == NULL) |
7236 | conf = setup_conf(mddev); | |
7237 | else | |
7238 | conf = mddev->private; | |
7239 | ||
91adb564 N |
7240 | if (IS_ERR(conf)) |
7241 | return PTR_ERR(conf); | |
7242 | ||
486b0f7b SL |
7243 | if (test_bit(MD_HAS_JOURNAL, &mddev->flags)) { |
7244 | if (!journal_dev) { | |
cc6167b4 N |
7245 | pr_warn("md/raid:%s: journal disk is missing, force array readonly\n", |
7246 | mdname(mddev)); | |
486b0f7b SL |
7247 | mddev->ro = 1; |
7248 | set_disk_ro(mddev->gendisk, 1); | |
7249 | } else if (mddev->recovery_cp == MaxSector) | |
7250 | set_bit(MD_JOURNAL_CLEAN, &mddev->flags); | |
7dde2ad3 SL |
7251 | } |
7252 | ||
b5254dd5 | 7253 | conf->min_offset_diff = min_offset_diff; |
91adb564 N |
7254 | mddev->thread = conf->thread; |
7255 | conf->thread = NULL; | |
7256 | mddev->private = conf; | |
7257 | ||
17045f52 N |
7258 | for (i = 0; i < conf->raid_disks && conf->previous_raid_disks; |
7259 | i++) { | |
7260 | rdev = conf->disks[i].rdev; | |
7261 | if (!rdev && conf->disks[i].replacement) { | |
7262 | /* The replacement is all we have yet */ | |
7263 | rdev = conf->disks[i].replacement; | |
7264 | conf->disks[i].replacement = NULL; | |
7265 | clear_bit(Replacement, &rdev->flags); | |
7266 | conf->disks[i].rdev = rdev; | |
7267 | } | |
7268 | if (!rdev) | |
c148ffdc | 7269 | continue; |
17045f52 N |
7270 | if (conf->disks[i].replacement && |
7271 | conf->reshape_progress != MaxSector) { | |
7272 | /* replacements and reshape simply do not mix. */ | |
cc6167b4 | 7273 | pr_warn("md: cannot handle concurrent replacement and reshape.\n"); |
17045f52 N |
7274 | goto abort; |
7275 | } | |
2f115882 | 7276 | if (test_bit(In_sync, &rdev->flags)) { |
91adb564 | 7277 | working_disks++; |
2f115882 N |
7278 | continue; |
7279 | } | |
c148ffdc N |
7280 | /* This disc is not fully in-sync. However if it |
7281 | * just stored parity (beyond the recovery_offset), | |
7282 | * when we don't need to be concerned about the | |
7283 | * array being dirty. | |
7284 | * When reshape goes 'backwards', we never have | |
7285 | * partially completed devices, so we only need | |
7286 | * to worry about reshape going forwards. | |
7287 | */ | |
7288 | /* Hack because v0.91 doesn't store recovery_offset properly. */ | |
7289 | if (mddev->major_version == 0 && | |
7290 | mddev->minor_version > 90) | |
7291 | rdev->recovery_offset = reshape_offset; | |
5026d7a9 | 7292 | |
c148ffdc N |
7293 | if (rdev->recovery_offset < reshape_offset) { |
7294 | /* We need to check old and new layout */ | |
7295 | if (!only_parity(rdev->raid_disk, | |
7296 | conf->algorithm, | |
7297 | conf->raid_disks, | |
7298 | conf->max_degraded)) | |
7299 | continue; | |
7300 | } | |
7301 | if (!only_parity(rdev->raid_disk, | |
7302 | conf->prev_algo, | |
7303 | conf->previous_raid_disks, | |
7304 | conf->max_degraded)) | |
7305 | continue; | |
7306 | dirty_parity_disks++; | |
7307 | } | |
91adb564 | 7308 | |
17045f52 N |
7309 | /* |
7310 | * 0 for a fully functional array, 1 or 2 for a degraded array. | |
7311 | */ | |
2e38a37f | 7312 | mddev->degraded = raid5_calc_degraded(conf); |
91adb564 | 7313 | |
674806d6 | 7314 | if (has_failed(conf)) { |
cc6167b4 | 7315 | pr_crit("md/raid:%s: not enough operational devices (%d/%d failed)\n", |
02c2de8c | 7316 | mdname(mddev), mddev->degraded, conf->raid_disks); |
1da177e4 LT |
7317 | goto abort; |
7318 | } | |
7319 | ||
91adb564 | 7320 | /* device size must be a multiple of chunk size */ |
9d8f0363 | 7321 | mddev->dev_sectors &= ~(mddev->chunk_sectors - 1); |
91adb564 N |
7322 | mddev->resync_max_sectors = mddev->dev_sectors; |
7323 | ||
c148ffdc | 7324 | if (mddev->degraded > dirty_parity_disks && |
1da177e4 | 7325 | mddev->recovery_cp != MaxSector) { |
4536bf9b AP |
7326 | if (test_bit(MD_HAS_PPL, &mddev->flags)) |
7327 | pr_crit("md/raid:%s: starting dirty degraded array with PPL.\n", | |
7328 | mdname(mddev)); | |
7329 | else if (mddev->ok_start_degraded) | |
cc6167b4 N |
7330 | pr_crit("md/raid:%s: starting dirty degraded array - data corruption possible.\n", |
7331 | mdname(mddev)); | |
6ff8d8ec | 7332 | else { |
cc6167b4 N |
7333 | pr_crit("md/raid:%s: cannot start dirty degraded array.\n", |
7334 | mdname(mddev)); | |
6ff8d8ec N |
7335 | goto abort; |
7336 | } | |
1da177e4 LT |
7337 | } |
7338 | ||
cc6167b4 N |
7339 | pr_info("md/raid:%s: raid level %d active with %d out of %d devices, algorithm %d\n", |
7340 | mdname(mddev), conf->level, | |
7341 | mddev->raid_disks-mddev->degraded, mddev->raid_disks, | |
7342 | mddev->new_layout); | |
1da177e4 LT |
7343 | |
7344 | print_raid5_conf(conf); | |
7345 | ||
fef9c61f | 7346 | if (conf->reshape_progress != MaxSector) { |
fef9c61f | 7347 | conf->reshape_safe = conf->reshape_progress; |
f6705578 N |
7348 | atomic_set(&conf->reshape_stripes, 0); |
7349 | clear_bit(MD_RECOVERY_SYNC, &mddev->recovery); | |
7350 | clear_bit(MD_RECOVERY_CHECK, &mddev->recovery); | |
7351 | set_bit(MD_RECOVERY_RESHAPE, &mddev->recovery); | |
7352 | set_bit(MD_RECOVERY_RUNNING, &mddev->recovery); | |
7353 | mddev->sync_thread = md_register_thread(md_do_sync, mddev, | |
0da3c619 | 7354 | "reshape"); |
f6705578 N |
7355 | } |
7356 | ||
1da177e4 | 7357 | /* Ok, everything is just fine now */ |
a64c876f N |
7358 | if (mddev->to_remove == &raid5_attrs_group) |
7359 | mddev->to_remove = NULL; | |
00bcb4ac N |
7360 | else if (mddev->kobj.sd && |
7361 | sysfs_create_group(&mddev->kobj, &raid5_attrs_group)) | |
cc6167b4 N |
7362 | pr_warn("raid5: failed to create sysfs attributes for %s\n", |
7363 | mdname(mddev)); | |
4a5add49 | 7364 | md_set_array_sectors(mddev, raid5_size(mddev, 0, 0)); |
7a5febe9 | 7365 | |
4a5add49 | 7366 | if (mddev->queue) { |
9f7c2220 | 7367 | int chunk_size; |
620125f2 | 7368 | bool discard_supported = true; |
4a5add49 N |
7369 | /* read-ahead size must cover two whole stripes, which |
7370 | * is 2 * (datadisks) * chunksize where 'n' is the | |
7371 | * number of raid devices | |
7372 | */ | |
7373 | int data_disks = conf->previous_raid_disks - conf->max_degraded; | |
7374 | int stripe = data_disks * | |
7375 | ((mddev->chunk_sectors << 9) / PAGE_SIZE); | |
dc3b17cc JK |
7376 | if (mddev->queue->backing_dev_info->ra_pages < 2 * stripe) |
7377 | mddev->queue->backing_dev_info->ra_pages = 2 * stripe; | |
91adb564 | 7378 | |
9f7c2220 N |
7379 | chunk_size = mddev->chunk_sectors << 9; |
7380 | blk_queue_io_min(mddev->queue, chunk_size); | |
7381 | blk_queue_io_opt(mddev->queue, chunk_size * | |
7382 | (conf->raid_disks - conf->max_degraded)); | |
c78afc62 | 7383 | mddev->queue->limits.raid_partial_stripes_expensive = 1; |
620125f2 SL |
7384 | /* |
7385 | * We can only discard a whole stripe. It doesn't make sense to | |
7386 | * discard data disk but write parity disk | |
7387 | */ | |
7388 | stripe = stripe * PAGE_SIZE; | |
4ac6875e N |
7389 | /* Round up to power of 2, as discard handling |
7390 | * currently assumes that */ | |
7391 | while ((stripe-1) & stripe) | |
7392 | stripe = (stripe | (stripe-1)) + 1; | |
620125f2 SL |
7393 | mddev->queue->limits.discard_alignment = stripe; |
7394 | mddev->queue->limits.discard_granularity = stripe; | |
e8d7c332 KK |
7395 | |
7396 | /* | |
7397 | * We use 16-bit counter of active stripes in bi_phys_segments | |
7398 | * (minus one for over-loaded initialization) | |
7399 | */ | |
7400 | blk_queue_max_hw_sectors(mddev->queue, 0xfffe * STRIPE_SECTORS); | |
7401 | blk_queue_max_discard_sectors(mddev->queue, | |
7402 | 0xfffe * STRIPE_SECTORS); | |
7403 | ||
620125f2 SL |
7404 | /* |
7405 | * unaligned part of discard request will be ignored, so can't | |
8e0e99ba | 7406 | * guarantee discard_zeroes_data |
620125f2 SL |
7407 | */ |
7408 | mddev->queue->limits.discard_zeroes_data = 0; | |
8f6c2e4b | 7409 | |
5026d7a9 PA |
7410 | blk_queue_max_write_same_sectors(mddev->queue, 0); |
7411 | ||
05616be5 | 7412 | rdev_for_each(rdev, mddev) { |
9f7c2220 N |
7413 | disk_stack_limits(mddev->gendisk, rdev->bdev, |
7414 | rdev->data_offset << 9); | |
05616be5 N |
7415 | disk_stack_limits(mddev->gendisk, rdev->bdev, |
7416 | rdev->new_data_offset << 9); | |
620125f2 SL |
7417 | /* |
7418 | * discard_zeroes_data is required, otherwise data | |
7419 | * could be lost. Consider a scenario: discard a stripe | |
7420 | * (the stripe could be inconsistent if | |
7421 | * discard_zeroes_data is 0); write one disk of the | |
7422 | * stripe (the stripe could be inconsistent again | |
7423 | * depending on which disks are used to calculate | |
7424 | * parity); the disk is broken; The stripe data of this | |
7425 | * disk is lost. | |
7426 | */ | |
7427 | if (!blk_queue_discard(bdev_get_queue(rdev->bdev)) || | |
7428 | !bdev_get_queue(rdev->bdev)-> | |
7429 | limits.discard_zeroes_data) | |
7430 | discard_supported = false; | |
8e0e99ba N |
7431 | /* Unfortunately, discard_zeroes_data is not currently |
7432 | * a guarantee - just a hint. So we only allow DISCARD | |
7433 | * if the sysadmin has confirmed that only safe devices | |
7434 | * are in use by setting a module parameter. | |
7435 | */ | |
7436 | if (!devices_handle_discard_safely) { | |
7437 | if (discard_supported) { | |
7438 | pr_info("md/raid456: discard support disabled due to uncertainty.\n"); | |
7439 | pr_info("Set raid456.devices_handle_discard_safely=Y to override.\n"); | |
7440 | } | |
7441 | discard_supported = false; | |
7442 | } | |
05616be5 | 7443 | } |
620125f2 SL |
7444 | |
7445 | if (discard_supported && | |
e7597e69 JS |
7446 | mddev->queue->limits.max_discard_sectors >= (stripe >> 9) && |
7447 | mddev->queue->limits.discard_granularity >= stripe) | |
620125f2 SL |
7448 | queue_flag_set_unlocked(QUEUE_FLAG_DISCARD, |
7449 | mddev->queue); | |
7450 | else | |
7451 | queue_flag_clear_unlocked(QUEUE_FLAG_DISCARD, | |
7452 | mddev->queue); | |
1dffdddd SL |
7453 | |
7454 | blk_queue_max_hw_sectors(mddev->queue, UINT_MAX); | |
9f7c2220 | 7455 | } |
23032a0e | 7456 | |
ff875738 AP |
7457 | if (log_init(conf, journal_dev)) |
7458 | goto abort; | |
5c7e81c3 | 7459 | |
1da177e4 LT |
7460 | return 0; |
7461 | abort: | |
01f96c0a | 7462 | md_unregister_thread(&mddev->thread); |
e4f869d9 N |
7463 | print_raid5_conf(conf); |
7464 | free_conf(conf); | |
1da177e4 | 7465 | mddev->private = NULL; |
cc6167b4 | 7466 | pr_warn("md/raid:%s: failed to run raid set.\n", mdname(mddev)); |
1da177e4 LT |
7467 | return -EIO; |
7468 | } | |
7469 | ||
afa0f557 | 7470 | static void raid5_free(struct mddev *mddev, void *priv) |
1da177e4 | 7471 | { |
afa0f557 | 7472 | struct r5conf *conf = priv; |
1da177e4 | 7473 | |
95fc17aa | 7474 | free_conf(conf); |
a64c876f | 7475 | mddev->to_remove = &raid5_attrs_group; |
1da177e4 LT |
7476 | } |
7477 | ||
849674e4 | 7478 | static void raid5_status(struct seq_file *seq, struct mddev *mddev) |
1da177e4 | 7479 | { |
d1688a6d | 7480 | struct r5conf *conf = mddev->private; |
1da177e4 LT |
7481 | int i; |
7482 | ||
9d8f0363 | 7483 | seq_printf(seq, " level %d, %dk chunk, algorithm %d", mddev->level, |
3cb5edf4 | 7484 | conf->chunk_sectors / 2, mddev->layout); |
02c2de8c | 7485 | seq_printf (seq, " [%d/%d] [", conf->raid_disks, conf->raid_disks - mddev->degraded); |
5fd13351 N |
7486 | rcu_read_lock(); |
7487 | for (i = 0; i < conf->raid_disks; i++) { | |
7488 | struct md_rdev *rdev = rcu_dereference(conf->disks[i].rdev); | |
7489 | seq_printf (seq, "%s", rdev && test_bit(In_sync, &rdev->flags) ? "U" : "_"); | |
7490 | } | |
7491 | rcu_read_unlock(); | |
1da177e4 | 7492 | seq_printf (seq, "]"); |
1da177e4 LT |
7493 | } |
7494 | ||
d1688a6d | 7495 | static void print_raid5_conf (struct r5conf *conf) |
1da177e4 LT |
7496 | { |
7497 | int i; | |
7498 | struct disk_info *tmp; | |
7499 | ||
cc6167b4 | 7500 | pr_debug("RAID conf printout:\n"); |
1da177e4 | 7501 | if (!conf) { |
cc6167b4 | 7502 | pr_debug("(conf==NULL)\n"); |
1da177e4 LT |
7503 | return; |
7504 | } | |
cc6167b4 | 7505 | pr_debug(" --- level:%d rd:%d wd:%d\n", conf->level, |
0c55e022 N |
7506 | conf->raid_disks, |
7507 | conf->raid_disks - conf->mddev->degraded); | |
1da177e4 LT |
7508 | |
7509 | for (i = 0; i < conf->raid_disks; i++) { | |
7510 | char b[BDEVNAME_SIZE]; | |
7511 | tmp = conf->disks + i; | |
7512 | if (tmp->rdev) | |
cc6167b4 | 7513 | pr_debug(" disk %d, o:%d, dev:%s\n", |
0c55e022 N |
7514 | i, !test_bit(Faulty, &tmp->rdev->flags), |
7515 | bdevname(tmp->rdev->bdev, b)); | |
1da177e4 LT |
7516 | } |
7517 | } | |
7518 | ||
fd01b88c | 7519 | static int raid5_spare_active(struct mddev *mddev) |
1da177e4 LT |
7520 | { |
7521 | int i; | |
d1688a6d | 7522 | struct r5conf *conf = mddev->private; |
1da177e4 | 7523 | struct disk_info *tmp; |
6b965620 N |
7524 | int count = 0; |
7525 | unsigned long flags; | |
1da177e4 LT |
7526 | |
7527 | for (i = 0; i < conf->raid_disks; i++) { | |
7528 | tmp = conf->disks + i; | |
dd054fce N |
7529 | if (tmp->replacement |
7530 | && tmp->replacement->recovery_offset == MaxSector | |
7531 | && !test_bit(Faulty, &tmp->replacement->flags) | |
7532 | && !test_and_set_bit(In_sync, &tmp->replacement->flags)) { | |
7533 | /* Replacement has just become active. */ | |
7534 | if (!tmp->rdev | |
7535 | || !test_and_clear_bit(In_sync, &tmp->rdev->flags)) | |
7536 | count++; | |
7537 | if (tmp->rdev) { | |
7538 | /* Replaced device not technically faulty, | |
7539 | * but we need to be sure it gets removed | |
7540 | * and never re-added. | |
7541 | */ | |
7542 | set_bit(Faulty, &tmp->rdev->flags); | |
7543 | sysfs_notify_dirent_safe( | |
7544 | tmp->rdev->sysfs_state); | |
7545 | } | |
7546 | sysfs_notify_dirent_safe(tmp->replacement->sysfs_state); | |
7547 | } else if (tmp->rdev | |
70fffd0b | 7548 | && tmp->rdev->recovery_offset == MaxSector |
b2d444d7 | 7549 | && !test_bit(Faulty, &tmp->rdev->flags) |
c04be0aa | 7550 | && !test_and_set_bit(In_sync, &tmp->rdev->flags)) { |
6b965620 | 7551 | count++; |
43c73ca4 | 7552 | sysfs_notify_dirent_safe(tmp->rdev->sysfs_state); |
1da177e4 LT |
7553 | } |
7554 | } | |
6b965620 | 7555 | spin_lock_irqsave(&conf->device_lock, flags); |
2e38a37f | 7556 | mddev->degraded = raid5_calc_degraded(conf); |
6b965620 | 7557 | spin_unlock_irqrestore(&conf->device_lock, flags); |
1da177e4 | 7558 | print_raid5_conf(conf); |
6b965620 | 7559 | return count; |
1da177e4 LT |
7560 | } |
7561 | ||
b8321b68 | 7562 | static int raid5_remove_disk(struct mddev *mddev, struct md_rdev *rdev) |
1da177e4 | 7563 | { |
d1688a6d | 7564 | struct r5conf *conf = mddev->private; |
1da177e4 | 7565 | int err = 0; |
b8321b68 | 7566 | int number = rdev->raid_disk; |
657e3e4d | 7567 | struct md_rdev **rdevp; |
1da177e4 LT |
7568 | struct disk_info *p = conf->disks + number; |
7569 | ||
7570 | print_raid5_conf(conf); | |
f6b6ec5c | 7571 | if (test_bit(Journal, &rdev->flags) && conf->log) { |
c2bb6242 | 7572 | /* |
f6b6ec5c SL |
7573 | * we can't wait pending write here, as this is called in |
7574 | * raid5d, wait will deadlock. | |
c2bb6242 | 7575 | */ |
f6b6ec5c SL |
7576 | if (atomic_read(&mddev->writes_pending)) |
7577 | return -EBUSY; | |
ff875738 | 7578 | log_exit(conf); |
f6b6ec5c | 7579 | return 0; |
c2bb6242 | 7580 | } |
657e3e4d N |
7581 | if (rdev == p->rdev) |
7582 | rdevp = &p->rdev; | |
7583 | else if (rdev == p->replacement) | |
7584 | rdevp = &p->replacement; | |
7585 | else | |
7586 | return 0; | |
7587 | ||
7588 | if (number >= conf->raid_disks && | |
7589 | conf->reshape_progress == MaxSector) | |
7590 | clear_bit(In_sync, &rdev->flags); | |
7591 | ||
7592 | if (test_bit(In_sync, &rdev->flags) || | |
7593 | atomic_read(&rdev->nr_pending)) { | |
7594 | err = -EBUSY; | |
7595 | goto abort; | |
7596 | } | |
7597 | /* Only remove non-faulty devices if recovery | |
7598 | * isn't possible. | |
7599 | */ | |
7600 | if (!test_bit(Faulty, &rdev->flags) && | |
7601 | mddev->recovery_disabled != conf->recovery_disabled && | |
7602 | !has_failed(conf) && | |
dd054fce | 7603 | (!p->replacement || p->replacement == rdev) && |
657e3e4d N |
7604 | number < conf->raid_disks) { |
7605 | err = -EBUSY; | |
7606 | goto abort; | |
7607 | } | |
7608 | *rdevp = NULL; | |
d787be40 N |
7609 | if (!test_bit(RemoveSynchronized, &rdev->flags)) { |
7610 | synchronize_rcu(); | |
7611 | if (atomic_read(&rdev->nr_pending)) { | |
7612 | /* lost the race, try later */ | |
7613 | err = -EBUSY; | |
7614 | *rdevp = rdev; | |
7615 | } | |
7616 | } | |
6358c239 AP |
7617 | if (!err) { |
7618 | err = log_modify(conf, rdev, false); | |
7619 | if (err) | |
7620 | goto abort; | |
7621 | } | |
d787be40 | 7622 | if (p->replacement) { |
dd054fce N |
7623 | /* We must have just cleared 'rdev' */ |
7624 | p->rdev = p->replacement; | |
7625 | clear_bit(Replacement, &p->replacement->flags); | |
7626 | smp_mb(); /* Make sure other CPUs may see both as identical | |
7627 | * but will never see neither - if they are careful | |
7628 | */ | |
7629 | p->replacement = NULL; | |
7630 | clear_bit(WantReplacement, &rdev->flags); | |
6358c239 AP |
7631 | |
7632 | if (!err) | |
7633 | err = log_modify(conf, p->rdev, true); | |
dd054fce N |
7634 | } else |
7635 | /* We might have just removed the Replacement as faulty- | |
7636 | * clear the bit just in case | |
7637 | */ | |
7638 | clear_bit(WantReplacement, &rdev->flags); | |
1da177e4 LT |
7639 | abort: |
7640 | ||
7641 | print_raid5_conf(conf); | |
7642 | return err; | |
7643 | } | |
7644 | ||
fd01b88c | 7645 | static int raid5_add_disk(struct mddev *mddev, struct md_rdev *rdev) |
1da177e4 | 7646 | { |
d1688a6d | 7647 | struct r5conf *conf = mddev->private; |
199050ea | 7648 | int err = -EEXIST; |
1da177e4 LT |
7649 | int disk; |
7650 | struct disk_info *p; | |
6c2fce2e NB |
7651 | int first = 0; |
7652 | int last = conf->raid_disks - 1; | |
1da177e4 | 7653 | |
f6b6ec5c | 7654 | if (test_bit(Journal, &rdev->flags)) { |
f6b6ec5c SL |
7655 | if (conf->log) |
7656 | return -EBUSY; | |
7657 | ||
7658 | rdev->raid_disk = 0; | |
7659 | /* | |
7660 | * The array is in readonly mode if journal is missing, so no | |
7661 | * write requests running. We should be safe | |
7662 | */ | |
ff875738 | 7663 | log_init(conf, rdev); |
f6b6ec5c SL |
7664 | return 0; |
7665 | } | |
7f0da59b N |
7666 | if (mddev->recovery_disabled == conf->recovery_disabled) |
7667 | return -EBUSY; | |
7668 | ||
dc10c643 | 7669 | if (rdev->saved_raid_disk < 0 && has_failed(conf)) |
1da177e4 | 7670 | /* no point adding a device */ |
199050ea | 7671 | return -EINVAL; |
1da177e4 | 7672 | |
6c2fce2e NB |
7673 | if (rdev->raid_disk >= 0) |
7674 | first = last = rdev->raid_disk; | |
1da177e4 LT |
7675 | |
7676 | /* | |
16a53ecc N |
7677 | * find the disk ... but prefer rdev->saved_raid_disk |
7678 | * if possible. | |
1da177e4 | 7679 | */ |
16a53ecc | 7680 | if (rdev->saved_raid_disk >= 0 && |
6c2fce2e | 7681 | rdev->saved_raid_disk >= first && |
16a53ecc | 7682 | conf->disks[rdev->saved_raid_disk].rdev == NULL) |
5cfb22a1 N |
7683 | first = rdev->saved_raid_disk; |
7684 | ||
7685 | for (disk = first; disk <= last; disk++) { | |
7bfec5f3 N |
7686 | p = conf->disks + disk; |
7687 | if (p->rdev == NULL) { | |
b2d444d7 | 7688 | clear_bit(In_sync, &rdev->flags); |
1da177e4 | 7689 | rdev->raid_disk = disk; |
72626685 N |
7690 | if (rdev->saved_raid_disk != disk) |
7691 | conf->fullsync = 1; | |
d6065f7b | 7692 | rcu_assign_pointer(p->rdev, rdev); |
6358c239 AP |
7693 | |
7694 | err = log_modify(conf, rdev, true); | |
7695 | ||
5cfb22a1 | 7696 | goto out; |
1da177e4 | 7697 | } |
5cfb22a1 N |
7698 | } |
7699 | for (disk = first; disk <= last; disk++) { | |
7700 | p = conf->disks + disk; | |
7bfec5f3 N |
7701 | if (test_bit(WantReplacement, &p->rdev->flags) && |
7702 | p->replacement == NULL) { | |
7703 | clear_bit(In_sync, &rdev->flags); | |
7704 | set_bit(Replacement, &rdev->flags); | |
7705 | rdev->raid_disk = disk; | |
7706 | err = 0; | |
7707 | conf->fullsync = 1; | |
7708 | rcu_assign_pointer(p->replacement, rdev); | |
7709 | break; | |
7710 | } | |
7711 | } | |
5cfb22a1 | 7712 | out: |
1da177e4 | 7713 | print_raid5_conf(conf); |
199050ea | 7714 | return err; |
1da177e4 LT |
7715 | } |
7716 | ||
fd01b88c | 7717 | static int raid5_resize(struct mddev *mddev, sector_t sectors) |
1da177e4 LT |
7718 | { |
7719 | /* no resync is happening, and there is enough space | |
7720 | * on all devices, so we can resize. | |
7721 | * We need to make sure resync covers any new space. | |
7722 | * If the array is shrinking we should possibly wait until | |
7723 | * any io in the removed space completes, but it hardly seems | |
7724 | * worth it. | |
7725 | */ | |
a4a6125a | 7726 | sector_t newsize; |
3cb5edf4 N |
7727 | struct r5conf *conf = mddev->private; |
7728 | ||
3418d036 | 7729 | if (conf->log || raid5_has_ppl(conf)) |
713cf5a6 | 7730 | return -EINVAL; |
3cb5edf4 | 7731 | sectors &= ~((sector_t)conf->chunk_sectors - 1); |
a4a6125a N |
7732 | newsize = raid5_size(mddev, sectors, mddev->raid_disks); |
7733 | if (mddev->external_size && | |
7734 | mddev->array_sectors > newsize) | |
b522adcd | 7735 | return -EINVAL; |
a4a6125a N |
7736 | if (mddev->bitmap) { |
7737 | int ret = bitmap_resize(mddev->bitmap, sectors, 0, 0); | |
7738 | if (ret) | |
7739 | return ret; | |
7740 | } | |
7741 | md_set_array_sectors(mddev, newsize); | |
b098636c N |
7742 | if (sectors > mddev->dev_sectors && |
7743 | mddev->recovery_cp > mddev->dev_sectors) { | |
58c0fed4 | 7744 | mddev->recovery_cp = mddev->dev_sectors; |
1da177e4 LT |
7745 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
7746 | } | |
58c0fed4 | 7747 | mddev->dev_sectors = sectors; |
4b5c7ae8 | 7748 | mddev->resync_max_sectors = sectors; |
1da177e4 LT |
7749 | return 0; |
7750 | } | |
7751 | ||
fd01b88c | 7752 | static int check_stripe_cache(struct mddev *mddev) |
01ee22b4 N |
7753 | { |
7754 | /* Can only proceed if there are plenty of stripe_heads. | |
7755 | * We need a minimum of one full stripe,, and for sensible progress | |
7756 | * it is best to have about 4 times that. | |
7757 | * If we require 4 times, then the default 256 4K stripe_heads will | |
7758 | * allow for chunk sizes up to 256K, which is probably OK. | |
7759 | * If the chunk size is greater, user-space should request more | |
7760 | * stripe_heads first. | |
7761 | */ | |
d1688a6d | 7762 | struct r5conf *conf = mddev->private; |
01ee22b4 | 7763 | if (((mddev->chunk_sectors << 9) / STRIPE_SIZE) * 4 |
edbe83ab | 7764 | > conf->min_nr_stripes || |
01ee22b4 | 7765 | ((mddev->new_chunk_sectors << 9) / STRIPE_SIZE) * 4 |
edbe83ab | 7766 | > conf->min_nr_stripes) { |
cc6167b4 N |
7767 | pr_warn("md/raid:%s: reshape: not enough stripes. Needed %lu\n", |
7768 | mdname(mddev), | |
7769 | ((max(mddev->chunk_sectors, mddev->new_chunk_sectors) << 9) | |
7770 | / STRIPE_SIZE)*4); | |
01ee22b4 N |
7771 | return 0; |
7772 | } | |
7773 | return 1; | |
7774 | } | |
7775 | ||
fd01b88c | 7776 | static int check_reshape(struct mddev *mddev) |
29269553 | 7777 | { |
d1688a6d | 7778 | struct r5conf *conf = mddev->private; |
29269553 | 7779 | |
3418d036 | 7780 | if (conf->log || raid5_has_ppl(conf)) |
713cf5a6 | 7781 | return -EINVAL; |
88ce4930 N |
7782 | if (mddev->delta_disks == 0 && |
7783 | mddev->new_layout == mddev->layout && | |
664e7c41 | 7784 | mddev->new_chunk_sectors == mddev->chunk_sectors) |
50ac168a | 7785 | return 0; /* nothing to do */ |
674806d6 | 7786 | if (has_failed(conf)) |
ec32a2bd | 7787 | return -EINVAL; |
fdcfbbb6 | 7788 | if (mddev->delta_disks < 0 && mddev->reshape_position == MaxSector) { |
ec32a2bd N |
7789 | /* We might be able to shrink, but the devices must |
7790 | * be made bigger first. | |
7791 | * For raid6, 4 is the minimum size. | |
7792 | * Otherwise 2 is the minimum | |
7793 | */ | |
7794 | int min = 2; | |
7795 | if (mddev->level == 6) | |
7796 | min = 4; | |
7797 | if (mddev->raid_disks + mddev->delta_disks < min) | |
7798 | return -EINVAL; | |
7799 | } | |
29269553 | 7800 | |
01ee22b4 | 7801 | if (!check_stripe_cache(mddev)) |
29269553 | 7802 | return -ENOSPC; |
29269553 | 7803 | |
738a2738 N |
7804 | if (mddev->new_chunk_sectors > mddev->chunk_sectors || |
7805 | mddev->delta_disks > 0) | |
7806 | if (resize_chunks(conf, | |
7807 | conf->previous_raid_disks | |
7808 | + max(0, mddev->delta_disks), | |
7809 | max(mddev->new_chunk_sectors, | |
7810 | mddev->chunk_sectors) | |
7811 | ) < 0) | |
7812 | return -ENOMEM; | |
e56108d6 N |
7813 | return resize_stripes(conf, (conf->previous_raid_disks |
7814 | + mddev->delta_disks)); | |
63c70c4f N |
7815 | } |
7816 | ||
fd01b88c | 7817 | static int raid5_start_reshape(struct mddev *mddev) |
63c70c4f | 7818 | { |
d1688a6d | 7819 | struct r5conf *conf = mddev->private; |
3cb03002 | 7820 | struct md_rdev *rdev; |
63c70c4f | 7821 | int spares = 0; |
c04be0aa | 7822 | unsigned long flags; |
63c70c4f | 7823 | |
f416885e | 7824 | if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) |
63c70c4f N |
7825 | return -EBUSY; |
7826 | ||
01ee22b4 N |
7827 | if (!check_stripe_cache(mddev)) |
7828 | return -ENOSPC; | |
7829 | ||
30b67645 N |
7830 | if (has_failed(conf)) |
7831 | return -EINVAL; | |
7832 | ||
c6563a8c | 7833 | rdev_for_each(rdev, mddev) { |
469518a3 N |
7834 | if (!test_bit(In_sync, &rdev->flags) |
7835 | && !test_bit(Faulty, &rdev->flags)) | |
29269553 | 7836 | spares++; |
c6563a8c | 7837 | } |
63c70c4f | 7838 | |
f416885e | 7839 | if (spares - mddev->degraded < mddev->delta_disks - conf->max_degraded) |
29269553 N |
7840 | /* Not enough devices even to make a degraded array |
7841 | * of that size | |
7842 | */ | |
7843 | return -EINVAL; | |
7844 | ||
ec32a2bd N |
7845 | /* Refuse to reduce size of the array. Any reductions in |
7846 | * array size must be through explicit setting of array_size | |
7847 | * attribute. | |
7848 | */ | |
7849 | if (raid5_size(mddev, 0, conf->raid_disks + mddev->delta_disks) | |
7850 | < mddev->array_sectors) { | |
cc6167b4 N |
7851 | pr_warn("md/raid:%s: array size must be reduced before number of disks\n", |
7852 | mdname(mddev)); | |
ec32a2bd N |
7853 | return -EINVAL; |
7854 | } | |
7855 | ||
f6705578 | 7856 | atomic_set(&conf->reshape_stripes, 0); |
29269553 | 7857 | spin_lock_irq(&conf->device_lock); |
c46501b2 | 7858 | write_seqcount_begin(&conf->gen_lock); |
29269553 | 7859 | conf->previous_raid_disks = conf->raid_disks; |
63c70c4f | 7860 | conf->raid_disks += mddev->delta_disks; |
09c9e5fa AN |
7861 | conf->prev_chunk_sectors = conf->chunk_sectors; |
7862 | conf->chunk_sectors = mddev->new_chunk_sectors; | |
88ce4930 N |
7863 | conf->prev_algo = conf->algorithm; |
7864 | conf->algorithm = mddev->new_layout; | |
05616be5 N |
7865 | conf->generation++; |
7866 | /* Code that selects data_offset needs to see the generation update | |
7867 | * if reshape_progress has been set - so a memory barrier needed. | |
7868 | */ | |
7869 | smp_mb(); | |
2c810cdd | 7870 | if (mddev->reshape_backwards) |
fef9c61f N |
7871 | conf->reshape_progress = raid5_size(mddev, 0, 0); |
7872 | else | |
7873 | conf->reshape_progress = 0; | |
7874 | conf->reshape_safe = conf->reshape_progress; | |
c46501b2 | 7875 | write_seqcount_end(&conf->gen_lock); |
29269553 N |
7876 | spin_unlock_irq(&conf->device_lock); |
7877 | ||
4d77e3ba N |
7878 | /* Now make sure any requests that proceeded on the assumption |
7879 | * the reshape wasn't running - like Discard or Read - have | |
7880 | * completed. | |
7881 | */ | |
7882 | mddev_suspend(mddev); | |
7883 | mddev_resume(mddev); | |
7884 | ||
29269553 N |
7885 | /* Add some new drives, as many as will fit. |
7886 | * We know there are enough to make the newly sized array work. | |
3424bf6a N |
7887 | * Don't add devices if we are reducing the number of |
7888 | * devices in the array. This is because it is not possible | |
7889 | * to correctly record the "partially reconstructed" state of | |
7890 | * such devices during the reshape and confusion could result. | |
29269553 | 7891 | */ |
87a8dec9 | 7892 | if (mddev->delta_disks >= 0) { |
dafb20fa | 7893 | rdev_for_each(rdev, mddev) |
87a8dec9 N |
7894 | if (rdev->raid_disk < 0 && |
7895 | !test_bit(Faulty, &rdev->flags)) { | |
7896 | if (raid5_add_disk(mddev, rdev) == 0) { | |
87a8dec9 | 7897 | if (rdev->raid_disk |
9d4c7d87 | 7898 | >= conf->previous_raid_disks) |
87a8dec9 | 7899 | set_bit(In_sync, &rdev->flags); |
9d4c7d87 | 7900 | else |
87a8dec9 | 7901 | rdev->recovery_offset = 0; |
36fad858 NK |
7902 | |
7903 | if (sysfs_link_rdev(mddev, rdev)) | |
87a8dec9 | 7904 | /* Failure here is OK */; |
50da0840 | 7905 | } |
87a8dec9 N |
7906 | } else if (rdev->raid_disk >= conf->previous_raid_disks |
7907 | && !test_bit(Faulty, &rdev->flags)) { | |
7908 | /* This is a spare that was manually added */ | |
7909 | set_bit(In_sync, &rdev->flags); | |
87a8dec9 | 7910 | } |
29269553 | 7911 | |
87a8dec9 N |
7912 | /* When a reshape changes the number of devices, |
7913 | * ->degraded is measured against the larger of the | |
7914 | * pre and post number of devices. | |
7915 | */ | |
ec32a2bd | 7916 | spin_lock_irqsave(&conf->device_lock, flags); |
2e38a37f | 7917 | mddev->degraded = raid5_calc_degraded(conf); |
ec32a2bd N |
7918 | spin_unlock_irqrestore(&conf->device_lock, flags); |
7919 | } | |
63c70c4f | 7920 | mddev->raid_disks = conf->raid_disks; |
e516402c | 7921 | mddev->reshape_position = conf->reshape_progress; |
2953079c | 7922 | set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags); |
f6705578 | 7923 | |
29269553 N |
7924 | clear_bit(MD_RECOVERY_SYNC, &mddev->recovery); |
7925 | clear_bit(MD_RECOVERY_CHECK, &mddev->recovery); | |
ea358cd0 | 7926 | clear_bit(MD_RECOVERY_DONE, &mddev->recovery); |
29269553 N |
7927 | set_bit(MD_RECOVERY_RESHAPE, &mddev->recovery); |
7928 | set_bit(MD_RECOVERY_RUNNING, &mddev->recovery); | |
7929 | mddev->sync_thread = md_register_thread(md_do_sync, mddev, | |
0da3c619 | 7930 | "reshape"); |
29269553 N |
7931 | if (!mddev->sync_thread) { |
7932 | mddev->recovery = 0; | |
7933 | spin_lock_irq(&conf->device_lock); | |
ba8805b9 | 7934 | write_seqcount_begin(&conf->gen_lock); |
29269553 | 7935 | mddev->raid_disks = conf->raid_disks = conf->previous_raid_disks; |
ba8805b9 N |
7936 | mddev->new_chunk_sectors = |
7937 | conf->chunk_sectors = conf->prev_chunk_sectors; | |
7938 | mddev->new_layout = conf->algorithm = conf->prev_algo; | |
05616be5 N |
7939 | rdev_for_each(rdev, mddev) |
7940 | rdev->new_data_offset = rdev->data_offset; | |
7941 | smp_wmb(); | |
ba8805b9 | 7942 | conf->generation --; |
fef9c61f | 7943 | conf->reshape_progress = MaxSector; |
1e3fa9bd | 7944 | mddev->reshape_position = MaxSector; |
ba8805b9 | 7945 | write_seqcount_end(&conf->gen_lock); |
29269553 N |
7946 | spin_unlock_irq(&conf->device_lock); |
7947 | return -EAGAIN; | |
7948 | } | |
c8f517c4 | 7949 | conf->reshape_checkpoint = jiffies; |
29269553 N |
7950 | md_wakeup_thread(mddev->sync_thread); |
7951 | md_new_event(mddev); | |
7952 | return 0; | |
7953 | } | |
29269553 | 7954 | |
ec32a2bd N |
7955 | /* This is called from the reshape thread and should make any |
7956 | * changes needed in 'conf' | |
7957 | */ | |
d1688a6d | 7958 | static void end_reshape(struct r5conf *conf) |
29269553 | 7959 | { |
29269553 | 7960 | |
f6705578 | 7961 | if (!test_bit(MD_RECOVERY_INTR, &conf->mddev->recovery)) { |
05616be5 | 7962 | struct md_rdev *rdev; |
f6705578 | 7963 | |
f6705578 | 7964 | spin_lock_irq(&conf->device_lock); |
cea9c228 | 7965 | conf->previous_raid_disks = conf->raid_disks; |
05616be5 N |
7966 | rdev_for_each(rdev, conf->mddev) |
7967 | rdev->data_offset = rdev->new_data_offset; | |
7968 | smp_wmb(); | |
fef9c61f | 7969 | conf->reshape_progress = MaxSector; |
6cbd8148 | 7970 | conf->mddev->reshape_position = MaxSector; |
f6705578 | 7971 | spin_unlock_irq(&conf->device_lock); |
b0f9ec04 | 7972 | wake_up(&conf->wait_for_overlap); |
16a53ecc N |
7973 | |
7974 | /* read-ahead size must cover two whole stripes, which is | |
7975 | * 2 * (datadisks) * chunksize where 'n' is the number of raid devices | |
7976 | */ | |
4a5add49 | 7977 | if (conf->mddev->queue) { |
cea9c228 | 7978 | int data_disks = conf->raid_disks - conf->max_degraded; |
09c9e5fa | 7979 | int stripe = data_disks * ((conf->chunk_sectors << 9) |
cea9c228 | 7980 | / PAGE_SIZE); |
dc3b17cc JK |
7981 | if (conf->mddev->queue->backing_dev_info->ra_pages < 2 * stripe) |
7982 | conf->mddev->queue->backing_dev_info->ra_pages = 2 * stripe; | |
16a53ecc | 7983 | } |
29269553 | 7984 | } |
29269553 N |
7985 | } |
7986 | ||
ec32a2bd N |
7987 | /* This is called from the raid5d thread with mddev_lock held. |
7988 | * It makes config changes to the device. | |
7989 | */ | |
fd01b88c | 7990 | static void raid5_finish_reshape(struct mddev *mddev) |
cea9c228 | 7991 | { |
d1688a6d | 7992 | struct r5conf *conf = mddev->private; |
cea9c228 N |
7993 | |
7994 | if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery)) { | |
7995 | ||
ec32a2bd N |
7996 | if (mddev->delta_disks > 0) { |
7997 | md_set_array_sectors(mddev, raid5_size(mddev, 0, 0)); | |
fe67d19a HM |
7998 | if (mddev->queue) { |
7999 | set_capacity(mddev->gendisk, mddev->array_sectors); | |
8000 | revalidate_disk(mddev->gendisk); | |
8001 | } | |
ec32a2bd N |
8002 | } else { |
8003 | int d; | |
908f4fbd | 8004 | spin_lock_irq(&conf->device_lock); |
2e38a37f | 8005 | mddev->degraded = raid5_calc_degraded(conf); |
908f4fbd | 8006 | spin_unlock_irq(&conf->device_lock); |
ec32a2bd N |
8007 | for (d = conf->raid_disks ; |
8008 | d < conf->raid_disks - mddev->delta_disks; | |
1a67dde0 | 8009 | d++) { |
3cb03002 | 8010 | struct md_rdev *rdev = conf->disks[d].rdev; |
da7613b8 N |
8011 | if (rdev) |
8012 | clear_bit(In_sync, &rdev->flags); | |
8013 | rdev = conf->disks[d].replacement; | |
8014 | if (rdev) | |
8015 | clear_bit(In_sync, &rdev->flags); | |
1a67dde0 | 8016 | } |
cea9c228 | 8017 | } |
88ce4930 | 8018 | mddev->layout = conf->algorithm; |
09c9e5fa | 8019 | mddev->chunk_sectors = conf->chunk_sectors; |
ec32a2bd N |
8020 | mddev->reshape_position = MaxSector; |
8021 | mddev->delta_disks = 0; | |
2c810cdd | 8022 | mddev->reshape_backwards = 0; |
cea9c228 N |
8023 | } |
8024 | } | |
8025 | ||
fd01b88c | 8026 | static void raid5_quiesce(struct mddev *mddev, int state) |
72626685 | 8027 | { |
d1688a6d | 8028 | struct r5conf *conf = mddev->private; |
72626685 N |
8029 | |
8030 | switch(state) { | |
e464eafd N |
8031 | case 2: /* resume for a suspend */ |
8032 | wake_up(&conf->wait_for_overlap); | |
8033 | break; | |
8034 | ||
72626685 | 8035 | case 1: /* stop all writes */ |
566c09c5 | 8036 | lock_all_device_hash_locks_irq(conf); |
64bd660b N |
8037 | /* '2' tells resync/reshape to pause so that all |
8038 | * active stripes can drain | |
8039 | */ | |
a39f7afd | 8040 | r5c_flush_cache(conf, INT_MAX); |
64bd660b | 8041 | conf->quiesce = 2; |
b1b46486 | 8042 | wait_event_cmd(conf->wait_for_quiescent, |
46031f9a RBJ |
8043 | atomic_read(&conf->active_stripes) == 0 && |
8044 | atomic_read(&conf->active_aligned_reads) == 0, | |
566c09c5 SL |
8045 | unlock_all_device_hash_locks_irq(conf), |
8046 | lock_all_device_hash_locks_irq(conf)); | |
64bd660b | 8047 | conf->quiesce = 1; |
566c09c5 | 8048 | unlock_all_device_hash_locks_irq(conf); |
64bd660b N |
8049 | /* allow reshape to continue */ |
8050 | wake_up(&conf->wait_for_overlap); | |
72626685 N |
8051 | break; |
8052 | ||
8053 | case 0: /* re-enable writes */ | |
566c09c5 | 8054 | lock_all_device_hash_locks_irq(conf); |
72626685 | 8055 | conf->quiesce = 0; |
b1b46486 | 8056 | wake_up(&conf->wait_for_quiescent); |
e464eafd | 8057 | wake_up(&conf->wait_for_overlap); |
566c09c5 | 8058 | unlock_all_device_hash_locks_irq(conf); |
72626685 N |
8059 | break; |
8060 | } | |
e6c033f7 | 8061 | r5l_quiesce(conf->log, state); |
72626685 | 8062 | } |
b15c2e57 | 8063 | |
fd01b88c | 8064 | static void *raid45_takeover_raid0(struct mddev *mddev, int level) |
54071b38 | 8065 | { |
e373ab10 | 8066 | struct r0conf *raid0_conf = mddev->private; |
d76c8420 | 8067 | sector_t sectors; |
54071b38 | 8068 | |
f1b29bca | 8069 | /* for raid0 takeover only one zone is supported */ |
e373ab10 | 8070 | if (raid0_conf->nr_strip_zones > 1) { |
cc6167b4 N |
8071 | pr_warn("md/raid:%s: cannot takeover raid0 with more than one zone.\n", |
8072 | mdname(mddev)); | |
f1b29bca DW |
8073 | return ERR_PTR(-EINVAL); |
8074 | } | |
8075 | ||
e373ab10 N |
8076 | sectors = raid0_conf->strip_zone[0].zone_end; |
8077 | sector_div(sectors, raid0_conf->strip_zone[0].nb_dev); | |
3b71bd93 | 8078 | mddev->dev_sectors = sectors; |
f1b29bca | 8079 | mddev->new_level = level; |
54071b38 TM |
8080 | mddev->new_layout = ALGORITHM_PARITY_N; |
8081 | mddev->new_chunk_sectors = mddev->chunk_sectors; | |
8082 | mddev->raid_disks += 1; | |
8083 | mddev->delta_disks = 1; | |
8084 | /* make sure it will be not marked as dirty */ | |
8085 | mddev->recovery_cp = MaxSector; | |
8086 | ||
8087 | return setup_conf(mddev); | |
8088 | } | |
8089 | ||
fd01b88c | 8090 | static void *raid5_takeover_raid1(struct mddev *mddev) |
d562b0c4 N |
8091 | { |
8092 | int chunksect; | |
6995f0b2 | 8093 | void *ret; |
d562b0c4 N |
8094 | |
8095 | if (mddev->raid_disks != 2 || | |
8096 | mddev->degraded > 1) | |
8097 | return ERR_PTR(-EINVAL); | |
8098 | ||
8099 | /* Should check if there are write-behind devices? */ | |
8100 | ||
8101 | chunksect = 64*2; /* 64K by default */ | |
8102 | ||
8103 | /* The array must be an exact multiple of chunksize */ | |
8104 | while (chunksect && (mddev->array_sectors & (chunksect-1))) | |
8105 | chunksect >>= 1; | |
8106 | ||
8107 | if ((chunksect<<9) < STRIPE_SIZE) | |
8108 | /* array size does not allow a suitable chunk size */ | |
8109 | return ERR_PTR(-EINVAL); | |
8110 | ||
8111 | mddev->new_level = 5; | |
8112 | mddev->new_layout = ALGORITHM_LEFT_SYMMETRIC; | |
664e7c41 | 8113 | mddev->new_chunk_sectors = chunksect; |
d562b0c4 | 8114 | |
6995f0b2 | 8115 | ret = setup_conf(mddev); |
32cd7cbb | 8116 | if (!IS_ERR(ret)) |
394ed8e4 SL |
8117 | mddev_clear_unsupported_flags(mddev, |
8118 | UNSUPPORTED_MDDEV_FLAGS); | |
6995f0b2 | 8119 | return ret; |
d562b0c4 N |
8120 | } |
8121 | ||
fd01b88c | 8122 | static void *raid5_takeover_raid6(struct mddev *mddev) |
fc9739c6 N |
8123 | { |
8124 | int new_layout; | |
8125 | ||
8126 | switch (mddev->layout) { | |
8127 | case ALGORITHM_LEFT_ASYMMETRIC_6: | |
8128 | new_layout = ALGORITHM_LEFT_ASYMMETRIC; | |
8129 | break; | |
8130 | case ALGORITHM_RIGHT_ASYMMETRIC_6: | |
8131 | new_layout = ALGORITHM_RIGHT_ASYMMETRIC; | |
8132 | break; | |
8133 | case ALGORITHM_LEFT_SYMMETRIC_6: | |
8134 | new_layout = ALGORITHM_LEFT_SYMMETRIC; | |
8135 | break; | |
8136 | case ALGORITHM_RIGHT_SYMMETRIC_6: | |
8137 | new_layout = ALGORITHM_RIGHT_SYMMETRIC; | |
8138 | break; | |
8139 | case ALGORITHM_PARITY_0_6: | |
8140 | new_layout = ALGORITHM_PARITY_0; | |
8141 | break; | |
8142 | case ALGORITHM_PARITY_N: | |
8143 | new_layout = ALGORITHM_PARITY_N; | |
8144 | break; | |
8145 | default: | |
8146 | return ERR_PTR(-EINVAL); | |
8147 | } | |
8148 | mddev->new_level = 5; | |
8149 | mddev->new_layout = new_layout; | |
8150 | mddev->delta_disks = -1; | |
8151 | mddev->raid_disks -= 1; | |
8152 | return setup_conf(mddev); | |
8153 | } | |
8154 | ||
fd01b88c | 8155 | static int raid5_check_reshape(struct mddev *mddev) |
b3546035 | 8156 | { |
88ce4930 N |
8157 | /* For a 2-drive array, the layout and chunk size can be changed |
8158 | * immediately as not restriping is needed. | |
8159 | * For larger arrays we record the new value - after validation | |
8160 | * to be used by a reshape pass. | |
b3546035 | 8161 | */ |
d1688a6d | 8162 | struct r5conf *conf = mddev->private; |
597a711b | 8163 | int new_chunk = mddev->new_chunk_sectors; |
b3546035 | 8164 | |
597a711b | 8165 | if (mddev->new_layout >= 0 && !algorithm_valid_raid5(mddev->new_layout)) |
b3546035 N |
8166 | return -EINVAL; |
8167 | if (new_chunk > 0) { | |
0ba459d2 | 8168 | if (!is_power_of_2(new_chunk)) |
b3546035 | 8169 | return -EINVAL; |
597a711b | 8170 | if (new_chunk < (PAGE_SIZE>>9)) |
b3546035 | 8171 | return -EINVAL; |
597a711b | 8172 | if (mddev->array_sectors & (new_chunk-1)) |
b3546035 N |
8173 | /* not factor of array size */ |
8174 | return -EINVAL; | |
8175 | } | |
8176 | ||
8177 | /* They look valid */ | |
8178 | ||
88ce4930 | 8179 | if (mddev->raid_disks == 2) { |
597a711b N |
8180 | /* can make the change immediately */ |
8181 | if (mddev->new_layout >= 0) { | |
8182 | conf->algorithm = mddev->new_layout; | |
8183 | mddev->layout = mddev->new_layout; | |
88ce4930 N |
8184 | } |
8185 | if (new_chunk > 0) { | |
597a711b N |
8186 | conf->chunk_sectors = new_chunk ; |
8187 | mddev->chunk_sectors = new_chunk; | |
88ce4930 | 8188 | } |
2953079c | 8189 | set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags); |
88ce4930 | 8190 | md_wakeup_thread(mddev->thread); |
b3546035 | 8191 | } |
50ac168a | 8192 | return check_reshape(mddev); |
88ce4930 N |
8193 | } |
8194 | ||
fd01b88c | 8195 | static int raid6_check_reshape(struct mddev *mddev) |
88ce4930 | 8196 | { |
597a711b | 8197 | int new_chunk = mddev->new_chunk_sectors; |
50ac168a | 8198 | |
597a711b | 8199 | if (mddev->new_layout >= 0 && !algorithm_valid_raid6(mddev->new_layout)) |
88ce4930 | 8200 | return -EINVAL; |
b3546035 | 8201 | if (new_chunk > 0) { |
0ba459d2 | 8202 | if (!is_power_of_2(new_chunk)) |
88ce4930 | 8203 | return -EINVAL; |
597a711b | 8204 | if (new_chunk < (PAGE_SIZE >> 9)) |
88ce4930 | 8205 | return -EINVAL; |
597a711b | 8206 | if (mddev->array_sectors & (new_chunk-1)) |
88ce4930 N |
8207 | /* not factor of array size */ |
8208 | return -EINVAL; | |
b3546035 | 8209 | } |
88ce4930 N |
8210 | |
8211 | /* They look valid */ | |
50ac168a | 8212 | return check_reshape(mddev); |
b3546035 N |
8213 | } |
8214 | ||
fd01b88c | 8215 | static void *raid5_takeover(struct mddev *mddev) |
d562b0c4 N |
8216 | { |
8217 | /* raid5 can take over: | |
f1b29bca | 8218 | * raid0 - if there is only one strip zone - make it a raid4 layout |
d562b0c4 N |
8219 | * raid1 - if there are two drives. We need to know the chunk size |
8220 | * raid4 - trivial - just use a raid4 layout. | |
8221 | * raid6 - Providing it is a *_6 layout | |
d562b0c4 | 8222 | */ |
f1b29bca DW |
8223 | if (mddev->level == 0) |
8224 | return raid45_takeover_raid0(mddev, 5); | |
d562b0c4 N |
8225 | if (mddev->level == 1) |
8226 | return raid5_takeover_raid1(mddev); | |
e9d4758f N |
8227 | if (mddev->level == 4) { |
8228 | mddev->new_layout = ALGORITHM_PARITY_N; | |
8229 | mddev->new_level = 5; | |
8230 | return setup_conf(mddev); | |
8231 | } | |
fc9739c6 N |
8232 | if (mddev->level == 6) |
8233 | return raid5_takeover_raid6(mddev); | |
d562b0c4 N |
8234 | |
8235 | return ERR_PTR(-EINVAL); | |
8236 | } | |
8237 | ||
fd01b88c | 8238 | static void *raid4_takeover(struct mddev *mddev) |
a78d38a1 | 8239 | { |
f1b29bca DW |
8240 | /* raid4 can take over: |
8241 | * raid0 - if there is only one strip zone | |
8242 | * raid5 - if layout is right | |
a78d38a1 | 8243 | */ |
f1b29bca DW |
8244 | if (mddev->level == 0) |
8245 | return raid45_takeover_raid0(mddev, 4); | |
a78d38a1 N |
8246 | if (mddev->level == 5 && |
8247 | mddev->layout == ALGORITHM_PARITY_N) { | |
8248 | mddev->new_layout = 0; | |
8249 | mddev->new_level = 4; | |
8250 | return setup_conf(mddev); | |
8251 | } | |
8252 | return ERR_PTR(-EINVAL); | |
8253 | } | |
d562b0c4 | 8254 | |
84fc4b56 | 8255 | static struct md_personality raid5_personality; |
245f46c2 | 8256 | |
fd01b88c | 8257 | static void *raid6_takeover(struct mddev *mddev) |
245f46c2 N |
8258 | { |
8259 | /* Currently can only take over a raid5. We map the | |
8260 | * personality to an equivalent raid6 personality | |
8261 | * with the Q block at the end. | |
8262 | */ | |
8263 | int new_layout; | |
8264 | ||
8265 | if (mddev->pers != &raid5_personality) | |
8266 | return ERR_PTR(-EINVAL); | |
8267 | if (mddev->degraded > 1) | |
8268 | return ERR_PTR(-EINVAL); | |
8269 | if (mddev->raid_disks > 253) | |
8270 | return ERR_PTR(-EINVAL); | |
8271 | if (mddev->raid_disks < 3) | |
8272 | return ERR_PTR(-EINVAL); | |
8273 | ||
8274 | switch (mddev->layout) { | |
8275 | case ALGORITHM_LEFT_ASYMMETRIC: | |
8276 | new_layout = ALGORITHM_LEFT_ASYMMETRIC_6; | |
8277 | break; | |
8278 | case ALGORITHM_RIGHT_ASYMMETRIC: | |
8279 | new_layout = ALGORITHM_RIGHT_ASYMMETRIC_6; | |
8280 | break; | |
8281 | case ALGORITHM_LEFT_SYMMETRIC: | |
8282 | new_layout = ALGORITHM_LEFT_SYMMETRIC_6; | |
8283 | break; | |
8284 | case ALGORITHM_RIGHT_SYMMETRIC: | |
8285 | new_layout = ALGORITHM_RIGHT_SYMMETRIC_6; | |
8286 | break; | |
8287 | case ALGORITHM_PARITY_0: | |
8288 | new_layout = ALGORITHM_PARITY_0_6; | |
8289 | break; | |
8290 | case ALGORITHM_PARITY_N: | |
8291 | new_layout = ALGORITHM_PARITY_N; | |
8292 | break; | |
8293 | default: | |
8294 | return ERR_PTR(-EINVAL); | |
8295 | } | |
8296 | mddev->new_level = 6; | |
8297 | mddev->new_layout = new_layout; | |
8298 | mddev->delta_disks = 1; | |
8299 | mddev->raid_disks += 1; | |
8300 | return setup_conf(mddev); | |
8301 | } | |
8302 | ||
ba903a3e AP |
8303 | static void raid5_reset_stripe_cache(struct mddev *mddev) |
8304 | { | |
8305 | struct r5conf *conf = mddev->private; | |
8306 | ||
8307 | mutex_lock(&conf->cache_size_mutex); | |
8308 | while (conf->max_nr_stripes && | |
8309 | drop_one_stripe(conf)) | |
8310 | ; | |
8311 | while (conf->min_nr_stripes > conf->max_nr_stripes && | |
8312 | grow_one_stripe(conf, GFP_KERNEL)) | |
8313 | ; | |
8314 | mutex_unlock(&conf->cache_size_mutex); | |
8315 | } | |
8316 | ||
8317 | static int raid5_change_consistency_policy(struct mddev *mddev, const char *buf) | |
8318 | { | |
8319 | struct r5conf *conf; | |
8320 | int err; | |
8321 | ||
8322 | err = mddev_lock(mddev); | |
8323 | if (err) | |
8324 | return err; | |
8325 | conf = mddev->private; | |
8326 | if (!conf) { | |
8327 | mddev_unlock(mddev); | |
8328 | return -ENODEV; | |
8329 | } | |
8330 | ||
8331 | if (strncmp(buf, "ppl", 3) == 0 && !raid5_has_ppl(conf)) { | |
8332 | mddev_suspend(mddev); | |
8333 | set_bit(MD_HAS_PPL, &mddev->flags); | |
8334 | err = log_init(conf, NULL); | |
8335 | if (!err) | |
8336 | raid5_reset_stripe_cache(mddev); | |
8337 | mddev_resume(mddev); | |
8338 | } else if (strncmp(buf, "resync", 6) == 0 && raid5_has_ppl(conf)) { | |
8339 | mddev_suspend(mddev); | |
8340 | log_exit(conf); | |
8341 | raid5_reset_stripe_cache(mddev); | |
8342 | mddev_resume(mddev); | |
8343 | } else { | |
8344 | err = -EINVAL; | |
8345 | } | |
8346 | ||
8347 | if (!err) | |
8348 | md_update_sb(mddev, 1); | |
8349 | ||
8350 | mddev_unlock(mddev); | |
8351 | ||
8352 | return err; | |
8353 | } | |
8354 | ||
84fc4b56 | 8355 | static struct md_personality raid6_personality = |
16a53ecc N |
8356 | { |
8357 | .name = "raid6", | |
8358 | .level = 6, | |
8359 | .owner = THIS_MODULE, | |
849674e4 SL |
8360 | .make_request = raid5_make_request, |
8361 | .run = raid5_run, | |
afa0f557 | 8362 | .free = raid5_free, |
849674e4 SL |
8363 | .status = raid5_status, |
8364 | .error_handler = raid5_error, | |
16a53ecc N |
8365 | .hot_add_disk = raid5_add_disk, |
8366 | .hot_remove_disk= raid5_remove_disk, | |
8367 | .spare_active = raid5_spare_active, | |
849674e4 | 8368 | .sync_request = raid5_sync_request, |
16a53ecc | 8369 | .resize = raid5_resize, |
80c3a6ce | 8370 | .size = raid5_size, |
50ac168a | 8371 | .check_reshape = raid6_check_reshape, |
f416885e | 8372 | .start_reshape = raid5_start_reshape, |
cea9c228 | 8373 | .finish_reshape = raid5_finish_reshape, |
16a53ecc | 8374 | .quiesce = raid5_quiesce, |
245f46c2 | 8375 | .takeover = raid6_takeover, |
5c675f83 | 8376 | .congested = raid5_congested, |
16a53ecc | 8377 | }; |
84fc4b56 | 8378 | static struct md_personality raid5_personality = |
1da177e4 LT |
8379 | { |
8380 | .name = "raid5", | |
2604b703 | 8381 | .level = 5, |
1da177e4 | 8382 | .owner = THIS_MODULE, |
849674e4 SL |
8383 | .make_request = raid5_make_request, |
8384 | .run = raid5_run, | |
afa0f557 | 8385 | .free = raid5_free, |
849674e4 SL |
8386 | .status = raid5_status, |
8387 | .error_handler = raid5_error, | |
1da177e4 LT |
8388 | .hot_add_disk = raid5_add_disk, |
8389 | .hot_remove_disk= raid5_remove_disk, | |
8390 | .spare_active = raid5_spare_active, | |
849674e4 | 8391 | .sync_request = raid5_sync_request, |
1da177e4 | 8392 | .resize = raid5_resize, |
80c3a6ce | 8393 | .size = raid5_size, |
63c70c4f N |
8394 | .check_reshape = raid5_check_reshape, |
8395 | .start_reshape = raid5_start_reshape, | |
cea9c228 | 8396 | .finish_reshape = raid5_finish_reshape, |
72626685 | 8397 | .quiesce = raid5_quiesce, |
d562b0c4 | 8398 | .takeover = raid5_takeover, |
5c675f83 | 8399 | .congested = raid5_congested, |
ba903a3e | 8400 | .change_consistency_policy = raid5_change_consistency_policy, |
1da177e4 LT |
8401 | }; |
8402 | ||
84fc4b56 | 8403 | static struct md_personality raid4_personality = |
1da177e4 | 8404 | { |
2604b703 N |
8405 | .name = "raid4", |
8406 | .level = 4, | |
8407 | .owner = THIS_MODULE, | |
849674e4 SL |
8408 | .make_request = raid5_make_request, |
8409 | .run = raid5_run, | |
afa0f557 | 8410 | .free = raid5_free, |
849674e4 SL |
8411 | .status = raid5_status, |
8412 | .error_handler = raid5_error, | |
2604b703 N |
8413 | .hot_add_disk = raid5_add_disk, |
8414 | .hot_remove_disk= raid5_remove_disk, | |
8415 | .spare_active = raid5_spare_active, | |
849674e4 | 8416 | .sync_request = raid5_sync_request, |
2604b703 | 8417 | .resize = raid5_resize, |
80c3a6ce | 8418 | .size = raid5_size, |
3d37890b N |
8419 | .check_reshape = raid5_check_reshape, |
8420 | .start_reshape = raid5_start_reshape, | |
cea9c228 | 8421 | .finish_reshape = raid5_finish_reshape, |
2604b703 | 8422 | .quiesce = raid5_quiesce, |
a78d38a1 | 8423 | .takeover = raid4_takeover, |
5c675f83 | 8424 | .congested = raid5_congested, |
2604b703 N |
8425 | }; |
8426 | ||
8427 | static int __init raid5_init(void) | |
8428 | { | |
29c6d1bb SAS |
8429 | int ret; |
8430 | ||
851c30c9 SL |
8431 | raid5_wq = alloc_workqueue("raid5wq", |
8432 | WQ_UNBOUND|WQ_MEM_RECLAIM|WQ_CPU_INTENSIVE|WQ_SYSFS, 0); | |
8433 | if (!raid5_wq) | |
8434 | return -ENOMEM; | |
29c6d1bb SAS |
8435 | |
8436 | ret = cpuhp_setup_state_multi(CPUHP_MD_RAID5_PREPARE, | |
8437 | "md/raid5:prepare", | |
8438 | raid456_cpu_up_prepare, | |
8439 | raid456_cpu_dead); | |
8440 | if (ret) { | |
8441 | destroy_workqueue(raid5_wq); | |
8442 | return ret; | |
8443 | } | |
16a53ecc | 8444 | register_md_personality(&raid6_personality); |
2604b703 N |
8445 | register_md_personality(&raid5_personality); |
8446 | register_md_personality(&raid4_personality); | |
8447 | return 0; | |
1da177e4 LT |
8448 | } |
8449 | ||
2604b703 | 8450 | static void raid5_exit(void) |
1da177e4 | 8451 | { |
16a53ecc | 8452 | unregister_md_personality(&raid6_personality); |
2604b703 N |
8453 | unregister_md_personality(&raid5_personality); |
8454 | unregister_md_personality(&raid4_personality); | |
29c6d1bb | 8455 | cpuhp_remove_multi_state(CPUHP_MD_RAID5_PREPARE); |
851c30c9 | 8456 | destroy_workqueue(raid5_wq); |
1da177e4 LT |
8457 | } |
8458 | ||
8459 | module_init(raid5_init); | |
8460 | module_exit(raid5_exit); | |
8461 | MODULE_LICENSE("GPL"); | |
0efb9e61 | 8462 | MODULE_DESCRIPTION("RAID4/5/6 (striping with parity) personality for MD"); |
1da177e4 | 8463 | MODULE_ALIAS("md-personality-4"); /* RAID5 */ |
d9d166c2 N |
8464 | MODULE_ALIAS("md-raid5"); |
8465 | MODULE_ALIAS("md-raid4"); | |
2604b703 N |
8466 | MODULE_ALIAS("md-level-5"); |
8467 | MODULE_ALIAS("md-level-4"); | |
16a53ecc N |
8468 | MODULE_ALIAS("md-personality-8"); /* RAID6 */ |
8469 | MODULE_ALIAS("md-raid6"); | |
8470 | MODULE_ALIAS("md-level-6"); | |
8471 | ||
8472 | /* This used to be two separate modules, they were: */ | |
8473 | MODULE_ALIAS("raid5"); | |
8474 | MODULE_ALIAS("raid6"); |