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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> |
43b2e5d8 | 56 | #include "md.h" |
bff61975 | 57 | #include "raid5.h" |
54071b38 | 58 | #include "raid0.h" |
ef740c37 | 59 | #include "bitmap.h" |
72626685 | 60 | |
1da177e4 LT |
61 | /* |
62 | * Stripe cache | |
63 | */ | |
64 | ||
65 | #define NR_STRIPES 256 | |
66 | #define STRIPE_SIZE PAGE_SIZE | |
67 | #define STRIPE_SHIFT (PAGE_SHIFT - 9) | |
68 | #define STRIPE_SECTORS (STRIPE_SIZE>>9) | |
69 | #define IO_THRESHOLD 1 | |
8b3e6cdc | 70 | #define BYPASS_THRESHOLD 1 |
fccddba0 | 71 | #define NR_HASH (PAGE_SIZE / sizeof(struct hlist_head)) |
1da177e4 LT |
72 | #define HASH_MASK (NR_HASH - 1) |
73 | ||
d1688a6d | 74 | static inline struct hlist_head *stripe_hash(struct r5conf *conf, sector_t sect) |
db298e19 N |
75 | { |
76 | int hash = (sect >> STRIPE_SHIFT) & HASH_MASK; | |
77 | return &conf->stripe_hashtbl[hash]; | |
78 | } | |
1da177e4 LT |
79 | |
80 | /* bio's attached to a stripe+device for I/O are linked together in bi_sector | |
81 | * order without overlap. There may be several bio's per stripe+device, and | |
82 | * a bio could span several devices. | |
83 | * When walking this list for a particular stripe+device, we must never proceed | |
84 | * beyond a bio that extends past this device, as the next bio might no longer | |
85 | * be valid. | |
db298e19 | 86 | * This function is used to determine the 'next' bio in the list, given the sector |
1da177e4 LT |
87 | * of the current stripe+device |
88 | */ | |
db298e19 N |
89 | static inline struct bio *r5_next_bio(struct bio *bio, sector_t sector) |
90 | { | |
91 | int sectors = bio->bi_size >> 9; | |
92 | if (bio->bi_sector + sectors < sector + STRIPE_SECTORS) | |
93 | return bio->bi_next; | |
94 | else | |
95 | return NULL; | |
96 | } | |
1da177e4 | 97 | |
960e739d | 98 | /* |
5b99c2ff JA |
99 | * We maintain a biased count of active stripes in the bottom 16 bits of |
100 | * bi_phys_segments, and a count of processed stripes in the upper 16 bits | |
960e739d JA |
101 | */ |
102 | static inline int raid5_bi_phys_segments(struct bio *bio) | |
103 | { | |
5b99c2ff | 104 | return bio->bi_phys_segments & 0xffff; |
960e739d JA |
105 | } |
106 | ||
107 | static inline int raid5_bi_hw_segments(struct bio *bio) | |
108 | { | |
5b99c2ff | 109 | return (bio->bi_phys_segments >> 16) & 0xffff; |
960e739d JA |
110 | } |
111 | ||
112 | static inline int raid5_dec_bi_phys_segments(struct bio *bio) | |
113 | { | |
114 | --bio->bi_phys_segments; | |
115 | return raid5_bi_phys_segments(bio); | |
116 | } | |
117 | ||
118 | static inline int raid5_dec_bi_hw_segments(struct bio *bio) | |
119 | { | |
120 | unsigned short val = raid5_bi_hw_segments(bio); | |
121 | ||
122 | --val; | |
5b99c2ff | 123 | bio->bi_phys_segments = (val << 16) | raid5_bi_phys_segments(bio); |
960e739d JA |
124 | return val; |
125 | } | |
126 | ||
127 | static inline void raid5_set_bi_hw_segments(struct bio *bio, unsigned int cnt) | |
128 | { | |
9b2dc8b6 | 129 | bio->bi_phys_segments = raid5_bi_phys_segments(bio) | (cnt << 16); |
960e739d JA |
130 | } |
131 | ||
d0dabf7e N |
132 | /* Find first data disk in a raid6 stripe */ |
133 | static inline int raid6_d0(struct stripe_head *sh) | |
134 | { | |
67cc2b81 N |
135 | if (sh->ddf_layout) |
136 | /* ddf always start from first device */ | |
137 | return 0; | |
138 | /* md starts just after Q block */ | |
d0dabf7e N |
139 | if (sh->qd_idx == sh->disks - 1) |
140 | return 0; | |
141 | else | |
142 | return sh->qd_idx + 1; | |
143 | } | |
16a53ecc N |
144 | static inline int raid6_next_disk(int disk, int raid_disks) |
145 | { | |
146 | disk++; | |
147 | return (disk < raid_disks) ? disk : 0; | |
148 | } | |
a4456856 | 149 | |
d0dabf7e N |
150 | /* When walking through the disks in a raid5, starting at raid6_d0, |
151 | * We need to map each disk to a 'slot', where the data disks are slot | |
152 | * 0 .. raid_disks-3, the parity disk is raid_disks-2 and the Q disk | |
153 | * is raid_disks-1. This help does that mapping. | |
154 | */ | |
67cc2b81 N |
155 | static int raid6_idx_to_slot(int idx, struct stripe_head *sh, |
156 | int *count, int syndrome_disks) | |
d0dabf7e | 157 | { |
6629542e | 158 | int slot = *count; |
67cc2b81 | 159 | |
e4424fee | 160 | if (sh->ddf_layout) |
6629542e | 161 | (*count)++; |
d0dabf7e | 162 | if (idx == sh->pd_idx) |
67cc2b81 | 163 | return syndrome_disks; |
d0dabf7e | 164 | if (idx == sh->qd_idx) |
67cc2b81 | 165 | return syndrome_disks + 1; |
e4424fee | 166 | if (!sh->ddf_layout) |
6629542e | 167 | (*count)++; |
d0dabf7e N |
168 | return slot; |
169 | } | |
170 | ||
a4456856 DW |
171 | static void return_io(struct bio *return_bi) |
172 | { | |
173 | struct bio *bi = return_bi; | |
174 | while (bi) { | |
a4456856 DW |
175 | |
176 | return_bi = bi->bi_next; | |
177 | bi->bi_next = NULL; | |
178 | bi->bi_size = 0; | |
0e13fe23 | 179 | bio_endio(bi, 0); |
a4456856 DW |
180 | bi = return_bi; |
181 | } | |
182 | } | |
183 | ||
d1688a6d | 184 | static void print_raid5_conf (struct r5conf *conf); |
1da177e4 | 185 | |
600aa109 DW |
186 | static int stripe_operations_active(struct stripe_head *sh) |
187 | { | |
188 | return sh->check_state || sh->reconstruct_state || | |
189 | test_bit(STRIPE_BIOFILL_RUN, &sh->state) || | |
190 | test_bit(STRIPE_COMPUTE_RUN, &sh->state); | |
191 | } | |
192 | ||
d1688a6d | 193 | static void __release_stripe(struct r5conf *conf, struct stripe_head *sh) |
1da177e4 LT |
194 | { |
195 | if (atomic_dec_and_test(&sh->count)) { | |
78bafebd ES |
196 | BUG_ON(!list_empty(&sh->lru)); |
197 | BUG_ON(atomic_read(&conf->active_stripes)==0); | |
1da177e4 | 198 | if (test_bit(STRIPE_HANDLE, &sh->state)) { |
fab363b5 SL |
199 | if (test_bit(STRIPE_DELAYED, &sh->state) && |
200 | !test_bit(STRIPE_PREREAD_ACTIVE, &sh->state)) | |
1da177e4 | 201 | list_add_tail(&sh->lru, &conf->delayed_list); |
482c0834 N |
202 | else if (test_bit(STRIPE_BIT_DELAY, &sh->state) && |
203 | sh->bm_seq - conf->seq_write > 0) | |
72626685 | 204 | list_add_tail(&sh->lru, &conf->bitmap_list); |
482c0834 | 205 | else { |
fab363b5 | 206 | clear_bit(STRIPE_DELAYED, &sh->state); |
72626685 | 207 | clear_bit(STRIPE_BIT_DELAY, &sh->state); |
1da177e4 | 208 | list_add_tail(&sh->lru, &conf->handle_list); |
72626685 | 209 | } |
1da177e4 LT |
210 | md_wakeup_thread(conf->mddev->thread); |
211 | } else { | |
600aa109 | 212 | BUG_ON(stripe_operations_active(sh)); |
41fe75f6 | 213 | if (test_and_clear_bit(STRIPE_PREREAD_ACTIVE, &sh->state)) |
214 | if (atomic_dec_return(&conf->preread_active_stripes) | |
215 | < IO_THRESHOLD) | |
1da177e4 | 216 | md_wakeup_thread(conf->mddev->thread); |
1da177e4 | 217 | atomic_dec(&conf->active_stripes); |
ccfcc3c1 N |
218 | if (!test_bit(STRIPE_EXPANDING, &sh->state)) { |
219 | list_add_tail(&sh->lru, &conf->inactive_list); | |
1da177e4 | 220 | wake_up(&conf->wait_for_stripe); |
46031f9a RBJ |
221 | if (conf->retry_read_aligned) |
222 | md_wakeup_thread(conf->mddev->thread); | |
ccfcc3c1 | 223 | } |
1da177e4 LT |
224 | } |
225 | } | |
226 | } | |
d0dabf7e | 227 | |
1da177e4 LT |
228 | static void release_stripe(struct stripe_head *sh) |
229 | { | |
d1688a6d | 230 | struct r5conf *conf = sh->raid_conf; |
1da177e4 | 231 | unsigned long flags; |
16a53ecc | 232 | |
1da177e4 LT |
233 | spin_lock_irqsave(&conf->device_lock, flags); |
234 | __release_stripe(conf, sh); | |
235 | spin_unlock_irqrestore(&conf->device_lock, flags); | |
236 | } | |
237 | ||
fccddba0 | 238 | static inline void remove_hash(struct stripe_head *sh) |
1da177e4 | 239 | { |
45b4233c DW |
240 | pr_debug("remove_hash(), stripe %llu\n", |
241 | (unsigned long long)sh->sector); | |
1da177e4 | 242 | |
fccddba0 | 243 | hlist_del_init(&sh->hash); |
1da177e4 LT |
244 | } |
245 | ||
d1688a6d | 246 | static inline void insert_hash(struct r5conf *conf, struct stripe_head *sh) |
1da177e4 | 247 | { |
fccddba0 | 248 | struct hlist_head *hp = stripe_hash(conf, sh->sector); |
1da177e4 | 249 | |
45b4233c DW |
250 | pr_debug("insert_hash(), stripe %llu\n", |
251 | (unsigned long long)sh->sector); | |
1da177e4 | 252 | |
fccddba0 | 253 | hlist_add_head(&sh->hash, hp); |
1da177e4 LT |
254 | } |
255 | ||
256 | ||
257 | /* find an idle stripe, make sure it is unhashed, and return it. */ | |
d1688a6d | 258 | static struct stripe_head *get_free_stripe(struct r5conf *conf) |
1da177e4 LT |
259 | { |
260 | struct stripe_head *sh = NULL; | |
261 | struct list_head *first; | |
262 | ||
1da177e4 LT |
263 | if (list_empty(&conf->inactive_list)) |
264 | goto out; | |
265 | first = conf->inactive_list.next; | |
266 | sh = list_entry(first, struct stripe_head, lru); | |
267 | list_del_init(first); | |
268 | remove_hash(sh); | |
269 | atomic_inc(&conf->active_stripes); | |
270 | out: | |
271 | return sh; | |
272 | } | |
273 | ||
e4e11e38 | 274 | static void shrink_buffers(struct stripe_head *sh) |
1da177e4 LT |
275 | { |
276 | struct page *p; | |
277 | int i; | |
e4e11e38 | 278 | int num = sh->raid_conf->pool_size; |
1da177e4 | 279 | |
e4e11e38 | 280 | for (i = 0; i < num ; i++) { |
1da177e4 LT |
281 | p = sh->dev[i].page; |
282 | if (!p) | |
283 | continue; | |
284 | sh->dev[i].page = NULL; | |
2d1f3b5d | 285 | put_page(p); |
1da177e4 LT |
286 | } |
287 | } | |
288 | ||
e4e11e38 | 289 | static int grow_buffers(struct stripe_head *sh) |
1da177e4 LT |
290 | { |
291 | int i; | |
e4e11e38 | 292 | int num = sh->raid_conf->pool_size; |
1da177e4 | 293 | |
e4e11e38 | 294 | for (i = 0; i < num; i++) { |
1da177e4 LT |
295 | struct page *page; |
296 | ||
297 | if (!(page = alloc_page(GFP_KERNEL))) { | |
298 | return 1; | |
299 | } | |
300 | sh->dev[i].page = page; | |
301 | } | |
302 | return 0; | |
303 | } | |
304 | ||
784052ec | 305 | static void raid5_build_block(struct stripe_head *sh, int i, int previous); |
d1688a6d | 306 | static void stripe_set_idx(sector_t stripe, struct r5conf *conf, int previous, |
911d4ee8 | 307 | struct stripe_head *sh); |
1da177e4 | 308 | |
b5663ba4 | 309 | static void init_stripe(struct stripe_head *sh, sector_t sector, int previous) |
1da177e4 | 310 | { |
d1688a6d | 311 | struct r5conf *conf = sh->raid_conf; |
7ecaa1e6 | 312 | int i; |
1da177e4 | 313 | |
78bafebd ES |
314 | BUG_ON(atomic_read(&sh->count) != 0); |
315 | BUG_ON(test_bit(STRIPE_HANDLE, &sh->state)); | |
600aa109 | 316 | BUG_ON(stripe_operations_active(sh)); |
d84e0f10 | 317 | |
45b4233c | 318 | pr_debug("init_stripe called, stripe %llu\n", |
1da177e4 LT |
319 | (unsigned long long)sh->sector); |
320 | ||
321 | remove_hash(sh); | |
16a53ecc | 322 | |
86b42c71 | 323 | sh->generation = conf->generation - previous; |
b5663ba4 | 324 | sh->disks = previous ? conf->previous_raid_disks : conf->raid_disks; |
1da177e4 | 325 | sh->sector = sector; |
911d4ee8 | 326 | stripe_set_idx(sector, conf, previous, sh); |
1da177e4 LT |
327 | sh->state = 0; |
328 | ||
7ecaa1e6 N |
329 | |
330 | for (i = sh->disks; i--; ) { | |
1da177e4 LT |
331 | struct r5dev *dev = &sh->dev[i]; |
332 | ||
d84e0f10 | 333 | if (dev->toread || dev->read || dev->towrite || dev->written || |
1da177e4 | 334 | test_bit(R5_LOCKED, &dev->flags)) { |
d84e0f10 | 335 | printk(KERN_ERR "sector=%llx i=%d %p %p %p %p %d\n", |
1da177e4 | 336 | (unsigned long long)sh->sector, i, dev->toread, |
d84e0f10 | 337 | dev->read, dev->towrite, dev->written, |
1da177e4 | 338 | test_bit(R5_LOCKED, &dev->flags)); |
8cfa7b0f | 339 | WARN_ON(1); |
1da177e4 LT |
340 | } |
341 | dev->flags = 0; | |
784052ec | 342 | raid5_build_block(sh, i, previous); |
1da177e4 LT |
343 | } |
344 | insert_hash(conf, sh); | |
345 | } | |
346 | ||
d1688a6d | 347 | static struct stripe_head *__find_stripe(struct r5conf *conf, sector_t sector, |
86b42c71 | 348 | short generation) |
1da177e4 LT |
349 | { |
350 | struct stripe_head *sh; | |
fccddba0 | 351 | struct hlist_node *hn; |
1da177e4 | 352 | |
45b4233c | 353 | pr_debug("__find_stripe, sector %llu\n", (unsigned long long)sector); |
fccddba0 | 354 | hlist_for_each_entry(sh, hn, stripe_hash(conf, sector), hash) |
86b42c71 | 355 | if (sh->sector == sector && sh->generation == generation) |
1da177e4 | 356 | return sh; |
45b4233c | 357 | pr_debug("__stripe %llu not in cache\n", (unsigned long long)sector); |
1da177e4 LT |
358 | return NULL; |
359 | } | |
360 | ||
674806d6 N |
361 | /* |
362 | * Need to check if array has failed when deciding whether to: | |
363 | * - start an array | |
364 | * - remove non-faulty devices | |
365 | * - add a spare | |
366 | * - allow a reshape | |
367 | * This determination is simple when no reshape is happening. | |
368 | * However if there is a reshape, we need to carefully check | |
369 | * both the before and after sections. | |
370 | * This is because some failed devices may only affect one | |
371 | * of the two sections, and some non-in_sync devices may | |
372 | * be insync in the section most affected by failed devices. | |
373 | */ | |
908f4fbd | 374 | static int calc_degraded(struct r5conf *conf) |
674806d6 | 375 | { |
908f4fbd | 376 | int degraded, degraded2; |
674806d6 | 377 | int i; |
674806d6 N |
378 | |
379 | rcu_read_lock(); | |
380 | degraded = 0; | |
381 | for (i = 0; i < conf->previous_raid_disks; i++) { | |
3cb03002 | 382 | struct md_rdev *rdev = rcu_dereference(conf->disks[i].rdev); |
674806d6 N |
383 | if (!rdev || test_bit(Faulty, &rdev->flags)) |
384 | degraded++; | |
385 | else if (test_bit(In_sync, &rdev->flags)) | |
386 | ; | |
387 | else | |
388 | /* not in-sync or faulty. | |
389 | * If the reshape increases the number of devices, | |
390 | * this is being recovered by the reshape, so | |
391 | * this 'previous' section is not in_sync. | |
392 | * If the number of devices is being reduced however, | |
393 | * the device can only be part of the array if | |
394 | * we are reverting a reshape, so this section will | |
395 | * be in-sync. | |
396 | */ | |
397 | if (conf->raid_disks >= conf->previous_raid_disks) | |
398 | degraded++; | |
399 | } | |
400 | rcu_read_unlock(); | |
908f4fbd N |
401 | if (conf->raid_disks == conf->previous_raid_disks) |
402 | return degraded; | |
674806d6 | 403 | rcu_read_lock(); |
908f4fbd | 404 | degraded2 = 0; |
674806d6 | 405 | for (i = 0; i < conf->raid_disks; i++) { |
3cb03002 | 406 | struct md_rdev *rdev = rcu_dereference(conf->disks[i].rdev); |
674806d6 | 407 | if (!rdev || test_bit(Faulty, &rdev->flags)) |
908f4fbd | 408 | degraded2++; |
674806d6 N |
409 | else if (test_bit(In_sync, &rdev->flags)) |
410 | ; | |
411 | else | |
412 | /* not in-sync or faulty. | |
413 | * If reshape increases the number of devices, this | |
414 | * section has already been recovered, else it | |
415 | * almost certainly hasn't. | |
416 | */ | |
417 | if (conf->raid_disks <= conf->previous_raid_disks) | |
908f4fbd | 418 | degraded2++; |
674806d6 N |
419 | } |
420 | rcu_read_unlock(); | |
908f4fbd N |
421 | if (degraded2 > degraded) |
422 | return degraded2; | |
423 | return degraded; | |
424 | } | |
425 | ||
426 | static int has_failed(struct r5conf *conf) | |
427 | { | |
428 | int degraded; | |
429 | ||
430 | if (conf->mddev->reshape_position == MaxSector) | |
431 | return conf->mddev->degraded > conf->max_degraded; | |
432 | ||
433 | degraded = calc_degraded(conf); | |
674806d6 N |
434 | if (degraded > conf->max_degraded) |
435 | return 1; | |
436 | return 0; | |
437 | } | |
438 | ||
b5663ba4 | 439 | static struct stripe_head * |
d1688a6d | 440 | get_active_stripe(struct r5conf *conf, sector_t sector, |
a8c906ca | 441 | int previous, int noblock, int noquiesce) |
1da177e4 LT |
442 | { |
443 | struct stripe_head *sh; | |
444 | ||
45b4233c | 445 | pr_debug("get_stripe, sector %llu\n", (unsigned long long)sector); |
1da177e4 LT |
446 | |
447 | spin_lock_irq(&conf->device_lock); | |
448 | ||
449 | do { | |
72626685 | 450 | wait_event_lock_irq(conf->wait_for_stripe, |
a8c906ca | 451 | conf->quiesce == 0 || noquiesce, |
72626685 | 452 | conf->device_lock, /* nothing */); |
86b42c71 | 453 | sh = __find_stripe(conf, sector, conf->generation - previous); |
1da177e4 LT |
454 | if (!sh) { |
455 | if (!conf->inactive_blocked) | |
456 | sh = get_free_stripe(conf); | |
457 | if (noblock && sh == NULL) | |
458 | break; | |
459 | if (!sh) { | |
460 | conf->inactive_blocked = 1; | |
461 | wait_event_lock_irq(conf->wait_for_stripe, | |
462 | !list_empty(&conf->inactive_list) && | |
5036805b N |
463 | (atomic_read(&conf->active_stripes) |
464 | < (conf->max_nr_stripes *3/4) | |
1da177e4 LT |
465 | || !conf->inactive_blocked), |
466 | conf->device_lock, | |
7c13edc8 | 467 | ); |
1da177e4 LT |
468 | conf->inactive_blocked = 0; |
469 | } else | |
b5663ba4 | 470 | init_stripe(sh, sector, previous); |
1da177e4 LT |
471 | } else { |
472 | if (atomic_read(&sh->count)) { | |
ab69ae12 | 473 | BUG_ON(!list_empty(&sh->lru) |
8811b596 SL |
474 | && !test_bit(STRIPE_EXPANDING, &sh->state) |
475 | && !test_bit(STRIPE_ON_UNPLUG_LIST, &sh->state)); | |
1da177e4 LT |
476 | } else { |
477 | if (!test_bit(STRIPE_HANDLE, &sh->state)) | |
478 | atomic_inc(&conf->active_stripes); | |
ff4e8d9a N |
479 | if (list_empty(&sh->lru) && |
480 | !test_bit(STRIPE_EXPANDING, &sh->state)) | |
16a53ecc N |
481 | BUG(); |
482 | list_del_init(&sh->lru); | |
1da177e4 LT |
483 | } |
484 | } | |
485 | } while (sh == NULL); | |
486 | ||
487 | if (sh) | |
488 | atomic_inc(&sh->count); | |
489 | ||
490 | spin_unlock_irq(&conf->device_lock); | |
491 | return sh; | |
492 | } | |
493 | ||
05616be5 N |
494 | /* Determine if 'data_offset' or 'new_data_offset' should be used |
495 | * in this stripe_head. | |
496 | */ | |
497 | static int use_new_offset(struct r5conf *conf, struct stripe_head *sh) | |
498 | { | |
499 | sector_t progress = conf->reshape_progress; | |
500 | /* Need a memory barrier to make sure we see the value | |
501 | * of conf->generation, or ->data_offset that was set before | |
502 | * reshape_progress was updated. | |
503 | */ | |
504 | smp_rmb(); | |
505 | if (progress == MaxSector) | |
506 | return 0; | |
507 | if (sh->generation == conf->generation - 1) | |
508 | return 0; | |
509 | /* We are in a reshape, and this is a new-generation stripe, | |
510 | * so use new_data_offset. | |
511 | */ | |
512 | return 1; | |
513 | } | |
514 | ||
6712ecf8 N |
515 | static void |
516 | raid5_end_read_request(struct bio *bi, int error); | |
517 | static void | |
518 | raid5_end_write_request(struct bio *bi, int error); | |
91c00924 | 519 | |
c4e5ac0a | 520 | static void ops_run_io(struct stripe_head *sh, struct stripe_head_state *s) |
91c00924 | 521 | { |
d1688a6d | 522 | struct r5conf *conf = sh->raid_conf; |
91c00924 DW |
523 | int i, disks = sh->disks; |
524 | ||
525 | might_sleep(); | |
526 | ||
527 | for (i = disks; i--; ) { | |
528 | int rw; | |
9a3e1101 | 529 | int replace_only = 0; |
977df362 N |
530 | struct bio *bi, *rbi; |
531 | struct md_rdev *rdev, *rrdev = NULL; | |
e9c7469b TH |
532 | if (test_and_clear_bit(R5_Wantwrite, &sh->dev[i].flags)) { |
533 | if (test_and_clear_bit(R5_WantFUA, &sh->dev[i].flags)) | |
534 | rw = WRITE_FUA; | |
535 | else | |
536 | rw = WRITE; | |
537 | } else if (test_and_clear_bit(R5_Wantread, &sh->dev[i].flags)) | |
91c00924 | 538 | rw = READ; |
9a3e1101 N |
539 | else if (test_and_clear_bit(R5_WantReplace, |
540 | &sh->dev[i].flags)) { | |
541 | rw = WRITE; | |
542 | replace_only = 1; | |
543 | } else | |
91c00924 | 544 | continue; |
bc0934f0 SL |
545 | if (test_and_clear_bit(R5_SyncIO, &sh->dev[i].flags)) |
546 | rw |= REQ_SYNC; | |
91c00924 DW |
547 | |
548 | bi = &sh->dev[i].req; | |
977df362 | 549 | rbi = &sh->dev[i].rreq; /* For writing to replacement */ |
91c00924 DW |
550 | |
551 | bi->bi_rw = rw; | |
977df362 N |
552 | rbi->bi_rw = rw; |
553 | if (rw & WRITE) { | |
91c00924 | 554 | bi->bi_end_io = raid5_end_write_request; |
977df362 N |
555 | rbi->bi_end_io = raid5_end_write_request; |
556 | } else | |
91c00924 DW |
557 | bi->bi_end_io = raid5_end_read_request; |
558 | ||
559 | rcu_read_lock(); | |
9a3e1101 | 560 | rrdev = rcu_dereference(conf->disks[i].replacement); |
dd054fce N |
561 | smp_mb(); /* Ensure that if rrdev is NULL, rdev won't be */ |
562 | rdev = rcu_dereference(conf->disks[i].rdev); | |
563 | if (!rdev) { | |
564 | rdev = rrdev; | |
565 | rrdev = NULL; | |
566 | } | |
9a3e1101 N |
567 | if (rw & WRITE) { |
568 | if (replace_only) | |
569 | rdev = NULL; | |
dd054fce N |
570 | if (rdev == rrdev) |
571 | /* We raced and saw duplicates */ | |
572 | rrdev = NULL; | |
9a3e1101 | 573 | } else { |
dd054fce | 574 | if (test_bit(R5_ReadRepl, &sh->dev[i].flags) && rrdev) |
9a3e1101 N |
575 | rdev = rrdev; |
576 | rrdev = NULL; | |
577 | } | |
977df362 | 578 | |
91c00924 DW |
579 | if (rdev && test_bit(Faulty, &rdev->flags)) |
580 | rdev = NULL; | |
581 | if (rdev) | |
582 | atomic_inc(&rdev->nr_pending); | |
977df362 N |
583 | if (rrdev && test_bit(Faulty, &rrdev->flags)) |
584 | rrdev = NULL; | |
585 | if (rrdev) | |
586 | atomic_inc(&rrdev->nr_pending); | |
91c00924 DW |
587 | rcu_read_unlock(); |
588 | ||
73e92e51 | 589 | /* We have already checked bad blocks for reads. Now |
977df362 N |
590 | * need to check for writes. We never accept write errors |
591 | * on the replacement, so we don't to check rrdev. | |
73e92e51 N |
592 | */ |
593 | while ((rw & WRITE) && rdev && | |
594 | test_bit(WriteErrorSeen, &rdev->flags)) { | |
595 | sector_t first_bad; | |
596 | int bad_sectors; | |
597 | int bad = is_badblock(rdev, sh->sector, STRIPE_SECTORS, | |
598 | &first_bad, &bad_sectors); | |
599 | if (!bad) | |
600 | break; | |
601 | ||
602 | if (bad < 0) { | |
603 | set_bit(BlockedBadBlocks, &rdev->flags); | |
604 | if (!conf->mddev->external && | |
605 | conf->mddev->flags) { | |
606 | /* It is very unlikely, but we might | |
607 | * still need to write out the | |
608 | * bad block log - better give it | |
609 | * a chance*/ | |
610 | md_check_recovery(conf->mddev); | |
611 | } | |
1850753d | 612 | /* |
613 | * Because md_wait_for_blocked_rdev | |
614 | * will dec nr_pending, we must | |
615 | * increment it first. | |
616 | */ | |
617 | atomic_inc(&rdev->nr_pending); | |
73e92e51 N |
618 | md_wait_for_blocked_rdev(rdev, conf->mddev); |
619 | } else { | |
620 | /* Acknowledged bad block - skip the write */ | |
621 | rdev_dec_pending(rdev, conf->mddev); | |
622 | rdev = NULL; | |
623 | } | |
624 | } | |
625 | ||
91c00924 | 626 | if (rdev) { |
9a3e1101 N |
627 | if (s->syncing || s->expanding || s->expanded |
628 | || s->replacing) | |
91c00924 DW |
629 | md_sync_acct(rdev->bdev, STRIPE_SECTORS); |
630 | ||
2b7497f0 DW |
631 | set_bit(STRIPE_IO_STARTED, &sh->state); |
632 | ||
91c00924 DW |
633 | bi->bi_bdev = rdev->bdev; |
634 | pr_debug("%s: for %llu schedule op %ld on disc %d\n", | |
e46b272b | 635 | __func__, (unsigned long long)sh->sector, |
91c00924 DW |
636 | bi->bi_rw, i); |
637 | atomic_inc(&sh->count); | |
05616be5 N |
638 | if (use_new_offset(conf, sh)) |
639 | bi->bi_sector = (sh->sector | |
640 | + rdev->new_data_offset); | |
641 | else | |
642 | bi->bi_sector = (sh->sector | |
643 | + rdev->data_offset); | |
91c00924 | 644 | bi->bi_flags = 1 << BIO_UPTODATE; |
91c00924 | 645 | bi->bi_idx = 0; |
91c00924 DW |
646 | bi->bi_io_vec[0].bv_len = STRIPE_SIZE; |
647 | bi->bi_io_vec[0].bv_offset = 0; | |
648 | bi->bi_size = STRIPE_SIZE; | |
649 | bi->bi_next = NULL; | |
977df362 N |
650 | if (rrdev) |
651 | set_bit(R5_DOUBLE_LOCKED, &sh->dev[i].flags); | |
91c00924 | 652 | generic_make_request(bi); |
977df362 N |
653 | } |
654 | if (rrdev) { | |
9a3e1101 N |
655 | if (s->syncing || s->expanding || s->expanded |
656 | || s->replacing) | |
977df362 N |
657 | md_sync_acct(rrdev->bdev, STRIPE_SECTORS); |
658 | ||
659 | set_bit(STRIPE_IO_STARTED, &sh->state); | |
660 | ||
661 | rbi->bi_bdev = rrdev->bdev; | |
662 | pr_debug("%s: for %llu schedule op %ld on " | |
663 | "replacement disc %d\n", | |
664 | __func__, (unsigned long long)sh->sector, | |
665 | rbi->bi_rw, i); | |
666 | atomic_inc(&sh->count); | |
05616be5 N |
667 | if (use_new_offset(conf, sh)) |
668 | rbi->bi_sector = (sh->sector | |
669 | + rrdev->new_data_offset); | |
670 | else | |
671 | rbi->bi_sector = (sh->sector | |
672 | + rrdev->data_offset); | |
977df362 N |
673 | rbi->bi_flags = 1 << BIO_UPTODATE; |
674 | rbi->bi_idx = 0; | |
675 | rbi->bi_io_vec[0].bv_len = STRIPE_SIZE; | |
676 | rbi->bi_io_vec[0].bv_offset = 0; | |
677 | rbi->bi_size = STRIPE_SIZE; | |
678 | rbi->bi_next = NULL; | |
679 | generic_make_request(rbi); | |
680 | } | |
681 | if (!rdev && !rrdev) { | |
b062962e | 682 | if (rw & WRITE) |
91c00924 DW |
683 | set_bit(STRIPE_DEGRADED, &sh->state); |
684 | pr_debug("skip op %ld on disc %d for sector %llu\n", | |
685 | bi->bi_rw, i, (unsigned long long)sh->sector); | |
686 | clear_bit(R5_LOCKED, &sh->dev[i].flags); | |
687 | set_bit(STRIPE_HANDLE, &sh->state); | |
688 | } | |
689 | } | |
690 | } | |
691 | ||
692 | static struct dma_async_tx_descriptor * | |
693 | async_copy_data(int frombio, struct bio *bio, struct page *page, | |
694 | sector_t sector, struct dma_async_tx_descriptor *tx) | |
695 | { | |
696 | struct bio_vec *bvl; | |
697 | struct page *bio_page; | |
698 | int i; | |
699 | int page_offset; | |
a08abd8c | 700 | struct async_submit_ctl submit; |
0403e382 | 701 | enum async_tx_flags flags = 0; |
91c00924 DW |
702 | |
703 | if (bio->bi_sector >= sector) | |
704 | page_offset = (signed)(bio->bi_sector - sector) * 512; | |
705 | else | |
706 | page_offset = (signed)(sector - bio->bi_sector) * -512; | |
a08abd8c | 707 | |
0403e382 DW |
708 | if (frombio) |
709 | flags |= ASYNC_TX_FENCE; | |
710 | init_async_submit(&submit, flags, tx, NULL, NULL, NULL); | |
711 | ||
91c00924 | 712 | bio_for_each_segment(bvl, bio, i) { |
fcde9075 | 713 | int len = bvl->bv_len; |
91c00924 DW |
714 | int clen; |
715 | int b_offset = 0; | |
716 | ||
717 | if (page_offset < 0) { | |
718 | b_offset = -page_offset; | |
719 | page_offset += b_offset; | |
720 | len -= b_offset; | |
721 | } | |
722 | ||
723 | if (len > 0 && page_offset + len > STRIPE_SIZE) | |
724 | clen = STRIPE_SIZE - page_offset; | |
725 | else | |
726 | clen = len; | |
727 | ||
728 | if (clen > 0) { | |
fcde9075 NK |
729 | b_offset += bvl->bv_offset; |
730 | bio_page = bvl->bv_page; | |
91c00924 DW |
731 | if (frombio) |
732 | tx = async_memcpy(page, bio_page, page_offset, | |
a08abd8c | 733 | b_offset, clen, &submit); |
91c00924 DW |
734 | else |
735 | tx = async_memcpy(bio_page, page, b_offset, | |
a08abd8c | 736 | page_offset, clen, &submit); |
91c00924 | 737 | } |
a08abd8c DW |
738 | /* chain the operations */ |
739 | submit.depend_tx = tx; | |
740 | ||
91c00924 DW |
741 | if (clen < len) /* hit end of page */ |
742 | break; | |
743 | page_offset += len; | |
744 | } | |
745 | ||
746 | return tx; | |
747 | } | |
748 | ||
749 | static void ops_complete_biofill(void *stripe_head_ref) | |
750 | { | |
751 | struct stripe_head *sh = stripe_head_ref; | |
752 | struct bio *return_bi = NULL; | |
d1688a6d | 753 | struct r5conf *conf = sh->raid_conf; |
e4d84909 | 754 | int i; |
91c00924 | 755 | |
e46b272b | 756 | pr_debug("%s: stripe %llu\n", __func__, |
91c00924 DW |
757 | (unsigned long long)sh->sector); |
758 | ||
759 | /* clear completed biofills */ | |
83de75cc | 760 | spin_lock_irq(&conf->device_lock); |
91c00924 DW |
761 | for (i = sh->disks; i--; ) { |
762 | struct r5dev *dev = &sh->dev[i]; | |
91c00924 DW |
763 | |
764 | /* acknowledge completion of a biofill operation */ | |
e4d84909 DW |
765 | /* and check if we need to reply to a read request, |
766 | * new R5_Wantfill requests are held off until | |
83de75cc | 767 | * !STRIPE_BIOFILL_RUN |
e4d84909 DW |
768 | */ |
769 | if (test_and_clear_bit(R5_Wantfill, &dev->flags)) { | |
91c00924 | 770 | struct bio *rbi, *rbi2; |
91c00924 | 771 | |
91c00924 DW |
772 | BUG_ON(!dev->read); |
773 | rbi = dev->read; | |
774 | dev->read = NULL; | |
775 | while (rbi && rbi->bi_sector < | |
776 | dev->sector + STRIPE_SECTORS) { | |
777 | rbi2 = r5_next_bio(rbi, dev->sector); | |
960e739d | 778 | if (!raid5_dec_bi_phys_segments(rbi)) { |
91c00924 DW |
779 | rbi->bi_next = return_bi; |
780 | return_bi = rbi; | |
781 | } | |
91c00924 DW |
782 | rbi = rbi2; |
783 | } | |
784 | } | |
785 | } | |
83de75cc DW |
786 | spin_unlock_irq(&conf->device_lock); |
787 | clear_bit(STRIPE_BIOFILL_RUN, &sh->state); | |
91c00924 DW |
788 | |
789 | return_io(return_bi); | |
790 | ||
e4d84909 | 791 | set_bit(STRIPE_HANDLE, &sh->state); |
91c00924 DW |
792 | release_stripe(sh); |
793 | } | |
794 | ||
795 | static void ops_run_biofill(struct stripe_head *sh) | |
796 | { | |
797 | struct dma_async_tx_descriptor *tx = NULL; | |
d1688a6d | 798 | struct r5conf *conf = sh->raid_conf; |
a08abd8c | 799 | struct async_submit_ctl submit; |
91c00924 DW |
800 | int i; |
801 | ||
e46b272b | 802 | pr_debug("%s: stripe %llu\n", __func__, |
91c00924 DW |
803 | (unsigned long long)sh->sector); |
804 | ||
805 | for (i = sh->disks; i--; ) { | |
806 | struct r5dev *dev = &sh->dev[i]; | |
807 | if (test_bit(R5_Wantfill, &dev->flags)) { | |
808 | struct bio *rbi; | |
809 | spin_lock_irq(&conf->device_lock); | |
810 | dev->read = rbi = dev->toread; | |
811 | dev->toread = NULL; | |
812 | spin_unlock_irq(&conf->device_lock); | |
813 | while (rbi && rbi->bi_sector < | |
814 | dev->sector + STRIPE_SECTORS) { | |
815 | tx = async_copy_data(0, rbi, dev->page, | |
816 | dev->sector, tx); | |
817 | rbi = r5_next_bio(rbi, dev->sector); | |
818 | } | |
819 | } | |
820 | } | |
821 | ||
822 | atomic_inc(&sh->count); | |
a08abd8c DW |
823 | init_async_submit(&submit, ASYNC_TX_ACK, tx, ops_complete_biofill, sh, NULL); |
824 | async_trigger_callback(&submit); | |
91c00924 DW |
825 | } |
826 | ||
4e7d2c0a | 827 | static void mark_target_uptodate(struct stripe_head *sh, int target) |
91c00924 | 828 | { |
4e7d2c0a | 829 | struct r5dev *tgt; |
91c00924 | 830 | |
4e7d2c0a DW |
831 | if (target < 0) |
832 | return; | |
91c00924 | 833 | |
4e7d2c0a | 834 | tgt = &sh->dev[target]; |
91c00924 DW |
835 | set_bit(R5_UPTODATE, &tgt->flags); |
836 | BUG_ON(!test_bit(R5_Wantcompute, &tgt->flags)); | |
837 | clear_bit(R5_Wantcompute, &tgt->flags); | |
4e7d2c0a DW |
838 | } |
839 | ||
ac6b53b6 | 840 | static void ops_complete_compute(void *stripe_head_ref) |
91c00924 DW |
841 | { |
842 | struct stripe_head *sh = stripe_head_ref; | |
91c00924 | 843 | |
e46b272b | 844 | pr_debug("%s: stripe %llu\n", __func__, |
91c00924 DW |
845 | (unsigned long long)sh->sector); |
846 | ||
ac6b53b6 | 847 | /* mark the computed target(s) as uptodate */ |
4e7d2c0a | 848 | mark_target_uptodate(sh, sh->ops.target); |
ac6b53b6 | 849 | mark_target_uptodate(sh, sh->ops.target2); |
4e7d2c0a | 850 | |
ecc65c9b DW |
851 | clear_bit(STRIPE_COMPUTE_RUN, &sh->state); |
852 | if (sh->check_state == check_state_compute_run) | |
853 | sh->check_state = check_state_compute_result; | |
91c00924 DW |
854 | set_bit(STRIPE_HANDLE, &sh->state); |
855 | release_stripe(sh); | |
856 | } | |
857 | ||
d6f38f31 DW |
858 | /* return a pointer to the address conversion region of the scribble buffer */ |
859 | static addr_conv_t *to_addr_conv(struct stripe_head *sh, | |
860 | struct raid5_percpu *percpu) | |
861 | { | |
862 | return percpu->scribble + sizeof(struct page *) * (sh->disks + 2); | |
863 | } | |
864 | ||
865 | static struct dma_async_tx_descriptor * | |
866 | ops_run_compute5(struct stripe_head *sh, struct raid5_percpu *percpu) | |
91c00924 | 867 | { |
91c00924 | 868 | int disks = sh->disks; |
d6f38f31 | 869 | struct page **xor_srcs = percpu->scribble; |
91c00924 DW |
870 | int target = sh->ops.target; |
871 | struct r5dev *tgt = &sh->dev[target]; | |
872 | struct page *xor_dest = tgt->page; | |
873 | int count = 0; | |
874 | struct dma_async_tx_descriptor *tx; | |
a08abd8c | 875 | struct async_submit_ctl submit; |
91c00924 DW |
876 | int i; |
877 | ||
878 | pr_debug("%s: stripe %llu block: %d\n", | |
e46b272b | 879 | __func__, (unsigned long long)sh->sector, target); |
91c00924 DW |
880 | BUG_ON(!test_bit(R5_Wantcompute, &tgt->flags)); |
881 | ||
882 | for (i = disks; i--; ) | |
883 | if (i != target) | |
884 | xor_srcs[count++] = sh->dev[i].page; | |
885 | ||
886 | atomic_inc(&sh->count); | |
887 | ||
0403e382 | 888 | init_async_submit(&submit, ASYNC_TX_FENCE|ASYNC_TX_XOR_ZERO_DST, NULL, |
ac6b53b6 | 889 | ops_complete_compute, sh, to_addr_conv(sh, percpu)); |
91c00924 | 890 | if (unlikely(count == 1)) |
a08abd8c | 891 | tx = async_memcpy(xor_dest, xor_srcs[0], 0, 0, STRIPE_SIZE, &submit); |
91c00924 | 892 | else |
a08abd8c | 893 | tx = async_xor(xor_dest, xor_srcs, 0, count, STRIPE_SIZE, &submit); |
91c00924 | 894 | |
91c00924 DW |
895 | return tx; |
896 | } | |
897 | ||
ac6b53b6 DW |
898 | /* set_syndrome_sources - populate source buffers for gen_syndrome |
899 | * @srcs - (struct page *) array of size sh->disks | |
900 | * @sh - stripe_head to parse | |
901 | * | |
902 | * Populates srcs in proper layout order for the stripe and returns the | |
903 | * 'count' of sources to be used in a call to async_gen_syndrome. The P | |
904 | * destination buffer is recorded in srcs[count] and the Q destination | |
905 | * is recorded in srcs[count+1]]. | |
906 | */ | |
907 | static int set_syndrome_sources(struct page **srcs, struct stripe_head *sh) | |
908 | { | |
909 | int disks = sh->disks; | |
910 | int syndrome_disks = sh->ddf_layout ? disks : (disks - 2); | |
911 | int d0_idx = raid6_d0(sh); | |
912 | int count; | |
913 | int i; | |
914 | ||
915 | for (i = 0; i < disks; i++) | |
5dd33c9a | 916 | srcs[i] = NULL; |
ac6b53b6 DW |
917 | |
918 | count = 0; | |
919 | i = d0_idx; | |
920 | do { | |
921 | int slot = raid6_idx_to_slot(i, sh, &count, syndrome_disks); | |
922 | ||
923 | srcs[slot] = sh->dev[i].page; | |
924 | i = raid6_next_disk(i, disks); | |
925 | } while (i != d0_idx); | |
ac6b53b6 | 926 | |
e4424fee | 927 | return syndrome_disks; |
ac6b53b6 DW |
928 | } |
929 | ||
930 | static struct dma_async_tx_descriptor * | |
931 | ops_run_compute6_1(struct stripe_head *sh, struct raid5_percpu *percpu) | |
932 | { | |
933 | int disks = sh->disks; | |
934 | struct page **blocks = percpu->scribble; | |
935 | int target; | |
936 | int qd_idx = sh->qd_idx; | |
937 | struct dma_async_tx_descriptor *tx; | |
938 | struct async_submit_ctl submit; | |
939 | struct r5dev *tgt; | |
940 | struct page *dest; | |
941 | int i; | |
942 | int count; | |
943 | ||
944 | if (sh->ops.target < 0) | |
945 | target = sh->ops.target2; | |
946 | else if (sh->ops.target2 < 0) | |
947 | target = sh->ops.target; | |
91c00924 | 948 | else |
ac6b53b6 DW |
949 | /* we should only have one valid target */ |
950 | BUG(); | |
951 | BUG_ON(target < 0); | |
952 | pr_debug("%s: stripe %llu block: %d\n", | |
953 | __func__, (unsigned long long)sh->sector, target); | |
954 | ||
955 | tgt = &sh->dev[target]; | |
956 | BUG_ON(!test_bit(R5_Wantcompute, &tgt->flags)); | |
957 | dest = tgt->page; | |
958 | ||
959 | atomic_inc(&sh->count); | |
960 | ||
961 | if (target == qd_idx) { | |
962 | count = set_syndrome_sources(blocks, sh); | |
963 | blocks[count] = NULL; /* regenerating p is not necessary */ | |
964 | BUG_ON(blocks[count+1] != dest); /* q should already be set */ | |
0403e382 DW |
965 | init_async_submit(&submit, ASYNC_TX_FENCE, NULL, |
966 | ops_complete_compute, sh, | |
ac6b53b6 DW |
967 | to_addr_conv(sh, percpu)); |
968 | tx = async_gen_syndrome(blocks, 0, count+2, STRIPE_SIZE, &submit); | |
969 | } else { | |
970 | /* Compute any data- or p-drive using XOR */ | |
971 | count = 0; | |
972 | for (i = disks; i-- ; ) { | |
973 | if (i == target || i == qd_idx) | |
974 | continue; | |
975 | blocks[count++] = sh->dev[i].page; | |
976 | } | |
977 | ||
0403e382 DW |
978 | init_async_submit(&submit, ASYNC_TX_FENCE|ASYNC_TX_XOR_ZERO_DST, |
979 | NULL, ops_complete_compute, sh, | |
ac6b53b6 DW |
980 | to_addr_conv(sh, percpu)); |
981 | tx = async_xor(dest, blocks, 0, count, STRIPE_SIZE, &submit); | |
982 | } | |
91c00924 | 983 | |
91c00924 DW |
984 | return tx; |
985 | } | |
986 | ||
ac6b53b6 DW |
987 | static struct dma_async_tx_descriptor * |
988 | ops_run_compute6_2(struct stripe_head *sh, struct raid5_percpu *percpu) | |
989 | { | |
990 | int i, count, disks = sh->disks; | |
991 | int syndrome_disks = sh->ddf_layout ? disks : disks-2; | |
992 | int d0_idx = raid6_d0(sh); | |
993 | int faila = -1, failb = -1; | |
994 | int target = sh->ops.target; | |
995 | int target2 = sh->ops.target2; | |
996 | struct r5dev *tgt = &sh->dev[target]; | |
997 | struct r5dev *tgt2 = &sh->dev[target2]; | |
998 | struct dma_async_tx_descriptor *tx; | |
999 | struct page **blocks = percpu->scribble; | |
1000 | struct async_submit_ctl submit; | |
1001 | ||
1002 | pr_debug("%s: stripe %llu block1: %d block2: %d\n", | |
1003 | __func__, (unsigned long long)sh->sector, target, target2); | |
1004 | BUG_ON(target < 0 || target2 < 0); | |
1005 | BUG_ON(!test_bit(R5_Wantcompute, &tgt->flags)); | |
1006 | BUG_ON(!test_bit(R5_Wantcompute, &tgt2->flags)); | |
1007 | ||
6c910a78 | 1008 | /* we need to open-code set_syndrome_sources to handle the |
ac6b53b6 DW |
1009 | * slot number conversion for 'faila' and 'failb' |
1010 | */ | |
1011 | for (i = 0; i < disks ; i++) | |
5dd33c9a | 1012 | blocks[i] = NULL; |
ac6b53b6 DW |
1013 | count = 0; |
1014 | i = d0_idx; | |
1015 | do { | |
1016 | int slot = raid6_idx_to_slot(i, sh, &count, syndrome_disks); | |
1017 | ||
1018 | blocks[slot] = sh->dev[i].page; | |
1019 | ||
1020 | if (i == target) | |
1021 | faila = slot; | |
1022 | if (i == target2) | |
1023 | failb = slot; | |
1024 | i = raid6_next_disk(i, disks); | |
1025 | } while (i != d0_idx); | |
ac6b53b6 DW |
1026 | |
1027 | BUG_ON(faila == failb); | |
1028 | if (failb < faila) | |
1029 | swap(faila, failb); | |
1030 | pr_debug("%s: stripe: %llu faila: %d failb: %d\n", | |
1031 | __func__, (unsigned long long)sh->sector, faila, failb); | |
1032 | ||
1033 | atomic_inc(&sh->count); | |
1034 | ||
1035 | if (failb == syndrome_disks+1) { | |
1036 | /* Q disk is one of the missing disks */ | |
1037 | if (faila == syndrome_disks) { | |
1038 | /* Missing P+Q, just recompute */ | |
0403e382 DW |
1039 | init_async_submit(&submit, ASYNC_TX_FENCE, NULL, |
1040 | ops_complete_compute, sh, | |
1041 | to_addr_conv(sh, percpu)); | |
e4424fee | 1042 | return async_gen_syndrome(blocks, 0, syndrome_disks+2, |
ac6b53b6 DW |
1043 | STRIPE_SIZE, &submit); |
1044 | } else { | |
1045 | struct page *dest; | |
1046 | int data_target; | |
1047 | int qd_idx = sh->qd_idx; | |
1048 | ||
1049 | /* Missing D+Q: recompute D from P, then recompute Q */ | |
1050 | if (target == qd_idx) | |
1051 | data_target = target2; | |
1052 | else | |
1053 | data_target = target; | |
1054 | ||
1055 | count = 0; | |
1056 | for (i = disks; i-- ; ) { | |
1057 | if (i == data_target || i == qd_idx) | |
1058 | continue; | |
1059 | blocks[count++] = sh->dev[i].page; | |
1060 | } | |
1061 | dest = sh->dev[data_target].page; | |
0403e382 DW |
1062 | init_async_submit(&submit, |
1063 | ASYNC_TX_FENCE|ASYNC_TX_XOR_ZERO_DST, | |
1064 | NULL, NULL, NULL, | |
1065 | to_addr_conv(sh, percpu)); | |
ac6b53b6 DW |
1066 | tx = async_xor(dest, blocks, 0, count, STRIPE_SIZE, |
1067 | &submit); | |
1068 | ||
1069 | count = set_syndrome_sources(blocks, sh); | |
0403e382 DW |
1070 | init_async_submit(&submit, ASYNC_TX_FENCE, tx, |
1071 | ops_complete_compute, sh, | |
1072 | to_addr_conv(sh, percpu)); | |
ac6b53b6 DW |
1073 | return async_gen_syndrome(blocks, 0, count+2, |
1074 | STRIPE_SIZE, &submit); | |
1075 | } | |
ac6b53b6 | 1076 | } else { |
6c910a78 DW |
1077 | init_async_submit(&submit, ASYNC_TX_FENCE, NULL, |
1078 | ops_complete_compute, sh, | |
1079 | to_addr_conv(sh, percpu)); | |
1080 | if (failb == syndrome_disks) { | |
1081 | /* We're missing D+P. */ | |
1082 | return async_raid6_datap_recov(syndrome_disks+2, | |
1083 | STRIPE_SIZE, faila, | |
1084 | blocks, &submit); | |
1085 | } else { | |
1086 | /* We're missing D+D. */ | |
1087 | return async_raid6_2data_recov(syndrome_disks+2, | |
1088 | STRIPE_SIZE, faila, failb, | |
1089 | blocks, &submit); | |
1090 | } | |
ac6b53b6 DW |
1091 | } |
1092 | } | |
1093 | ||
1094 | ||
91c00924 DW |
1095 | static void ops_complete_prexor(void *stripe_head_ref) |
1096 | { | |
1097 | struct stripe_head *sh = stripe_head_ref; | |
1098 | ||
e46b272b | 1099 | pr_debug("%s: stripe %llu\n", __func__, |
91c00924 | 1100 | (unsigned long long)sh->sector); |
91c00924 DW |
1101 | } |
1102 | ||
1103 | static struct dma_async_tx_descriptor * | |
d6f38f31 DW |
1104 | ops_run_prexor(struct stripe_head *sh, struct raid5_percpu *percpu, |
1105 | struct dma_async_tx_descriptor *tx) | |
91c00924 | 1106 | { |
91c00924 | 1107 | int disks = sh->disks; |
d6f38f31 | 1108 | struct page **xor_srcs = percpu->scribble; |
91c00924 | 1109 | int count = 0, pd_idx = sh->pd_idx, i; |
a08abd8c | 1110 | struct async_submit_ctl submit; |
91c00924 DW |
1111 | |
1112 | /* existing parity data subtracted */ | |
1113 | struct page *xor_dest = xor_srcs[count++] = sh->dev[pd_idx].page; | |
1114 | ||
e46b272b | 1115 | pr_debug("%s: stripe %llu\n", __func__, |
91c00924 DW |
1116 | (unsigned long long)sh->sector); |
1117 | ||
1118 | for (i = disks; i--; ) { | |
1119 | struct r5dev *dev = &sh->dev[i]; | |
1120 | /* Only process blocks that are known to be uptodate */ | |
d8ee0728 | 1121 | if (test_bit(R5_Wantdrain, &dev->flags)) |
91c00924 DW |
1122 | xor_srcs[count++] = dev->page; |
1123 | } | |
1124 | ||
0403e382 | 1125 | init_async_submit(&submit, ASYNC_TX_FENCE|ASYNC_TX_XOR_DROP_DST, tx, |
d6f38f31 | 1126 | ops_complete_prexor, sh, to_addr_conv(sh, percpu)); |
a08abd8c | 1127 | tx = async_xor(xor_dest, xor_srcs, 0, count, STRIPE_SIZE, &submit); |
91c00924 DW |
1128 | |
1129 | return tx; | |
1130 | } | |
1131 | ||
1132 | static struct dma_async_tx_descriptor * | |
d8ee0728 | 1133 | ops_run_biodrain(struct stripe_head *sh, struct dma_async_tx_descriptor *tx) |
91c00924 DW |
1134 | { |
1135 | int disks = sh->disks; | |
d8ee0728 | 1136 | int i; |
91c00924 | 1137 | |
e46b272b | 1138 | pr_debug("%s: stripe %llu\n", __func__, |
91c00924 DW |
1139 | (unsigned long long)sh->sector); |
1140 | ||
1141 | for (i = disks; i--; ) { | |
1142 | struct r5dev *dev = &sh->dev[i]; | |
1143 | struct bio *chosen; | |
91c00924 | 1144 | |
d8ee0728 | 1145 | if (test_and_clear_bit(R5_Wantdrain, &dev->flags)) { |
91c00924 DW |
1146 | struct bio *wbi; |
1147 | ||
cbe47ec5 | 1148 | spin_lock_irq(&sh->raid_conf->device_lock); |
91c00924 DW |
1149 | chosen = dev->towrite; |
1150 | dev->towrite = NULL; | |
1151 | BUG_ON(dev->written); | |
1152 | wbi = dev->written = chosen; | |
cbe47ec5 | 1153 | spin_unlock_irq(&sh->raid_conf->device_lock); |
91c00924 DW |
1154 | |
1155 | while (wbi && wbi->bi_sector < | |
1156 | dev->sector + STRIPE_SECTORS) { | |
e9c7469b TH |
1157 | if (wbi->bi_rw & REQ_FUA) |
1158 | set_bit(R5_WantFUA, &dev->flags); | |
bc0934f0 SL |
1159 | if (wbi->bi_rw & REQ_SYNC) |
1160 | set_bit(R5_SyncIO, &dev->flags); | |
91c00924 DW |
1161 | tx = async_copy_data(1, wbi, dev->page, |
1162 | dev->sector, tx); | |
1163 | wbi = r5_next_bio(wbi, dev->sector); | |
1164 | } | |
1165 | } | |
1166 | } | |
1167 | ||
1168 | return tx; | |
1169 | } | |
1170 | ||
ac6b53b6 | 1171 | static void ops_complete_reconstruct(void *stripe_head_ref) |
91c00924 DW |
1172 | { |
1173 | struct stripe_head *sh = stripe_head_ref; | |
ac6b53b6 DW |
1174 | int disks = sh->disks; |
1175 | int pd_idx = sh->pd_idx; | |
1176 | int qd_idx = sh->qd_idx; | |
1177 | int i; | |
bc0934f0 | 1178 | bool fua = false, sync = false; |
91c00924 | 1179 | |
e46b272b | 1180 | pr_debug("%s: stripe %llu\n", __func__, |
91c00924 DW |
1181 | (unsigned long long)sh->sector); |
1182 | ||
bc0934f0 | 1183 | for (i = disks; i--; ) { |
e9c7469b | 1184 | fua |= test_bit(R5_WantFUA, &sh->dev[i].flags); |
bc0934f0 SL |
1185 | sync |= test_bit(R5_SyncIO, &sh->dev[i].flags); |
1186 | } | |
e9c7469b | 1187 | |
91c00924 DW |
1188 | for (i = disks; i--; ) { |
1189 | struct r5dev *dev = &sh->dev[i]; | |
ac6b53b6 | 1190 | |
e9c7469b | 1191 | if (dev->written || i == pd_idx || i == qd_idx) { |
91c00924 | 1192 | set_bit(R5_UPTODATE, &dev->flags); |
e9c7469b TH |
1193 | if (fua) |
1194 | set_bit(R5_WantFUA, &dev->flags); | |
bc0934f0 SL |
1195 | if (sync) |
1196 | set_bit(R5_SyncIO, &dev->flags); | |
e9c7469b | 1197 | } |
91c00924 DW |
1198 | } |
1199 | ||
d8ee0728 DW |
1200 | if (sh->reconstruct_state == reconstruct_state_drain_run) |
1201 | sh->reconstruct_state = reconstruct_state_drain_result; | |
1202 | else if (sh->reconstruct_state == reconstruct_state_prexor_drain_run) | |
1203 | sh->reconstruct_state = reconstruct_state_prexor_drain_result; | |
1204 | else { | |
1205 | BUG_ON(sh->reconstruct_state != reconstruct_state_run); | |
1206 | sh->reconstruct_state = reconstruct_state_result; | |
1207 | } | |
91c00924 DW |
1208 | |
1209 | set_bit(STRIPE_HANDLE, &sh->state); | |
1210 | release_stripe(sh); | |
1211 | } | |
1212 | ||
1213 | static void | |
ac6b53b6 DW |
1214 | ops_run_reconstruct5(struct stripe_head *sh, struct raid5_percpu *percpu, |
1215 | struct dma_async_tx_descriptor *tx) | |
91c00924 | 1216 | { |
91c00924 | 1217 | int disks = sh->disks; |
d6f38f31 | 1218 | struct page **xor_srcs = percpu->scribble; |
a08abd8c | 1219 | struct async_submit_ctl submit; |
91c00924 DW |
1220 | int count = 0, pd_idx = sh->pd_idx, i; |
1221 | struct page *xor_dest; | |
d8ee0728 | 1222 | int prexor = 0; |
91c00924 | 1223 | unsigned long flags; |
91c00924 | 1224 | |
e46b272b | 1225 | pr_debug("%s: stripe %llu\n", __func__, |
91c00924 DW |
1226 | (unsigned long long)sh->sector); |
1227 | ||
1228 | /* check if prexor is active which means only process blocks | |
1229 | * that are part of a read-modify-write (written) | |
1230 | */ | |
d8ee0728 DW |
1231 | if (sh->reconstruct_state == reconstruct_state_prexor_drain_run) { |
1232 | prexor = 1; | |
91c00924 DW |
1233 | xor_dest = xor_srcs[count++] = sh->dev[pd_idx].page; |
1234 | for (i = disks; i--; ) { | |
1235 | struct r5dev *dev = &sh->dev[i]; | |
1236 | if (dev->written) | |
1237 | xor_srcs[count++] = dev->page; | |
1238 | } | |
1239 | } else { | |
1240 | xor_dest = sh->dev[pd_idx].page; | |
1241 | for (i = disks; i--; ) { | |
1242 | struct r5dev *dev = &sh->dev[i]; | |
1243 | if (i != pd_idx) | |
1244 | xor_srcs[count++] = dev->page; | |
1245 | } | |
1246 | } | |
1247 | ||
91c00924 DW |
1248 | /* 1/ if we prexor'd then the dest is reused as a source |
1249 | * 2/ if we did not prexor then we are redoing the parity | |
1250 | * set ASYNC_TX_XOR_DROP_DST and ASYNC_TX_XOR_ZERO_DST | |
1251 | * for the synchronous xor case | |
1252 | */ | |
88ba2aa5 | 1253 | flags = ASYNC_TX_ACK | |
91c00924 DW |
1254 | (prexor ? ASYNC_TX_XOR_DROP_DST : ASYNC_TX_XOR_ZERO_DST); |
1255 | ||
1256 | atomic_inc(&sh->count); | |
1257 | ||
ac6b53b6 | 1258 | init_async_submit(&submit, flags, tx, ops_complete_reconstruct, sh, |
d6f38f31 | 1259 | to_addr_conv(sh, percpu)); |
a08abd8c DW |
1260 | if (unlikely(count == 1)) |
1261 | tx = async_memcpy(xor_dest, xor_srcs[0], 0, 0, STRIPE_SIZE, &submit); | |
1262 | else | |
1263 | tx = async_xor(xor_dest, xor_srcs, 0, count, STRIPE_SIZE, &submit); | |
91c00924 DW |
1264 | } |
1265 | ||
ac6b53b6 DW |
1266 | static void |
1267 | ops_run_reconstruct6(struct stripe_head *sh, struct raid5_percpu *percpu, | |
1268 | struct dma_async_tx_descriptor *tx) | |
1269 | { | |
1270 | struct async_submit_ctl submit; | |
1271 | struct page **blocks = percpu->scribble; | |
1272 | int count; | |
1273 | ||
1274 | pr_debug("%s: stripe %llu\n", __func__, (unsigned long long)sh->sector); | |
1275 | ||
1276 | count = set_syndrome_sources(blocks, sh); | |
1277 | ||
1278 | atomic_inc(&sh->count); | |
1279 | ||
1280 | init_async_submit(&submit, ASYNC_TX_ACK, tx, ops_complete_reconstruct, | |
1281 | sh, to_addr_conv(sh, percpu)); | |
1282 | async_gen_syndrome(blocks, 0, count+2, STRIPE_SIZE, &submit); | |
91c00924 DW |
1283 | } |
1284 | ||
1285 | static void ops_complete_check(void *stripe_head_ref) | |
1286 | { | |
1287 | struct stripe_head *sh = stripe_head_ref; | |
91c00924 | 1288 | |
e46b272b | 1289 | pr_debug("%s: stripe %llu\n", __func__, |
91c00924 DW |
1290 | (unsigned long long)sh->sector); |
1291 | ||
ecc65c9b | 1292 | sh->check_state = check_state_check_result; |
91c00924 DW |
1293 | set_bit(STRIPE_HANDLE, &sh->state); |
1294 | release_stripe(sh); | |
1295 | } | |
1296 | ||
ac6b53b6 | 1297 | static void ops_run_check_p(struct stripe_head *sh, struct raid5_percpu *percpu) |
91c00924 | 1298 | { |
91c00924 | 1299 | int disks = sh->disks; |
ac6b53b6 DW |
1300 | int pd_idx = sh->pd_idx; |
1301 | int qd_idx = sh->qd_idx; | |
1302 | struct page *xor_dest; | |
d6f38f31 | 1303 | struct page **xor_srcs = percpu->scribble; |
91c00924 | 1304 | struct dma_async_tx_descriptor *tx; |
a08abd8c | 1305 | struct async_submit_ctl submit; |
ac6b53b6 DW |
1306 | int count; |
1307 | int i; | |
91c00924 | 1308 | |
e46b272b | 1309 | pr_debug("%s: stripe %llu\n", __func__, |
91c00924 DW |
1310 | (unsigned long long)sh->sector); |
1311 | ||
ac6b53b6 DW |
1312 | count = 0; |
1313 | xor_dest = sh->dev[pd_idx].page; | |
1314 | xor_srcs[count++] = xor_dest; | |
91c00924 | 1315 | for (i = disks; i--; ) { |
ac6b53b6 DW |
1316 | if (i == pd_idx || i == qd_idx) |
1317 | continue; | |
1318 | xor_srcs[count++] = sh->dev[i].page; | |
91c00924 DW |
1319 | } |
1320 | ||
d6f38f31 DW |
1321 | init_async_submit(&submit, 0, NULL, NULL, NULL, |
1322 | to_addr_conv(sh, percpu)); | |
099f53cb | 1323 | tx = async_xor_val(xor_dest, xor_srcs, 0, count, STRIPE_SIZE, |
a08abd8c | 1324 | &sh->ops.zero_sum_result, &submit); |
91c00924 | 1325 | |
91c00924 | 1326 | atomic_inc(&sh->count); |
a08abd8c DW |
1327 | init_async_submit(&submit, ASYNC_TX_ACK, tx, ops_complete_check, sh, NULL); |
1328 | tx = async_trigger_callback(&submit); | |
91c00924 DW |
1329 | } |
1330 | ||
ac6b53b6 DW |
1331 | static void ops_run_check_pq(struct stripe_head *sh, struct raid5_percpu *percpu, int checkp) |
1332 | { | |
1333 | struct page **srcs = percpu->scribble; | |
1334 | struct async_submit_ctl submit; | |
1335 | int count; | |
1336 | ||
1337 | pr_debug("%s: stripe %llu checkp: %d\n", __func__, | |
1338 | (unsigned long long)sh->sector, checkp); | |
1339 | ||
1340 | count = set_syndrome_sources(srcs, sh); | |
1341 | if (!checkp) | |
1342 | srcs[count] = NULL; | |
91c00924 | 1343 | |
91c00924 | 1344 | atomic_inc(&sh->count); |
ac6b53b6 DW |
1345 | init_async_submit(&submit, ASYNC_TX_ACK, NULL, ops_complete_check, |
1346 | sh, to_addr_conv(sh, percpu)); | |
1347 | async_syndrome_val(srcs, 0, count+2, STRIPE_SIZE, | |
1348 | &sh->ops.zero_sum_result, percpu->spare_page, &submit); | |
91c00924 DW |
1349 | } |
1350 | ||
417b8d4a | 1351 | static void __raid_run_ops(struct stripe_head *sh, unsigned long ops_request) |
91c00924 DW |
1352 | { |
1353 | int overlap_clear = 0, i, disks = sh->disks; | |
1354 | struct dma_async_tx_descriptor *tx = NULL; | |
d1688a6d | 1355 | struct r5conf *conf = sh->raid_conf; |
ac6b53b6 | 1356 | int level = conf->level; |
d6f38f31 DW |
1357 | struct raid5_percpu *percpu; |
1358 | unsigned long cpu; | |
91c00924 | 1359 | |
d6f38f31 DW |
1360 | cpu = get_cpu(); |
1361 | percpu = per_cpu_ptr(conf->percpu, cpu); | |
83de75cc | 1362 | if (test_bit(STRIPE_OP_BIOFILL, &ops_request)) { |
91c00924 DW |
1363 | ops_run_biofill(sh); |
1364 | overlap_clear++; | |
1365 | } | |
1366 | ||
7b3a871e | 1367 | if (test_bit(STRIPE_OP_COMPUTE_BLK, &ops_request)) { |
ac6b53b6 DW |
1368 | if (level < 6) |
1369 | tx = ops_run_compute5(sh, percpu); | |
1370 | else { | |
1371 | if (sh->ops.target2 < 0 || sh->ops.target < 0) | |
1372 | tx = ops_run_compute6_1(sh, percpu); | |
1373 | else | |
1374 | tx = ops_run_compute6_2(sh, percpu); | |
1375 | } | |
1376 | /* terminate the chain if reconstruct is not set to be run */ | |
1377 | if (tx && !test_bit(STRIPE_OP_RECONSTRUCT, &ops_request)) | |
7b3a871e DW |
1378 | async_tx_ack(tx); |
1379 | } | |
91c00924 | 1380 | |
600aa109 | 1381 | if (test_bit(STRIPE_OP_PREXOR, &ops_request)) |
d6f38f31 | 1382 | tx = ops_run_prexor(sh, percpu, tx); |
91c00924 | 1383 | |
600aa109 | 1384 | if (test_bit(STRIPE_OP_BIODRAIN, &ops_request)) { |
d8ee0728 | 1385 | tx = ops_run_biodrain(sh, tx); |
91c00924 DW |
1386 | overlap_clear++; |
1387 | } | |
1388 | ||
ac6b53b6 DW |
1389 | if (test_bit(STRIPE_OP_RECONSTRUCT, &ops_request)) { |
1390 | if (level < 6) | |
1391 | ops_run_reconstruct5(sh, percpu, tx); | |
1392 | else | |
1393 | ops_run_reconstruct6(sh, percpu, tx); | |
1394 | } | |
91c00924 | 1395 | |
ac6b53b6 DW |
1396 | if (test_bit(STRIPE_OP_CHECK, &ops_request)) { |
1397 | if (sh->check_state == check_state_run) | |
1398 | ops_run_check_p(sh, percpu); | |
1399 | else if (sh->check_state == check_state_run_q) | |
1400 | ops_run_check_pq(sh, percpu, 0); | |
1401 | else if (sh->check_state == check_state_run_pq) | |
1402 | ops_run_check_pq(sh, percpu, 1); | |
1403 | else | |
1404 | BUG(); | |
1405 | } | |
91c00924 | 1406 | |
91c00924 DW |
1407 | if (overlap_clear) |
1408 | for (i = disks; i--; ) { | |
1409 | struct r5dev *dev = &sh->dev[i]; | |
1410 | if (test_and_clear_bit(R5_Overlap, &dev->flags)) | |
1411 | wake_up(&sh->raid_conf->wait_for_overlap); | |
1412 | } | |
d6f38f31 | 1413 | put_cpu(); |
91c00924 DW |
1414 | } |
1415 | ||
417b8d4a DW |
1416 | #ifdef CONFIG_MULTICORE_RAID456 |
1417 | static void async_run_ops(void *param, async_cookie_t cookie) | |
1418 | { | |
1419 | struct stripe_head *sh = param; | |
1420 | unsigned long ops_request = sh->ops.request; | |
1421 | ||
1422 | clear_bit_unlock(STRIPE_OPS_REQ_PENDING, &sh->state); | |
1423 | wake_up(&sh->ops.wait_for_ops); | |
1424 | ||
1425 | __raid_run_ops(sh, ops_request); | |
1426 | release_stripe(sh); | |
1427 | } | |
1428 | ||
1429 | static void raid_run_ops(struct stripe_head *sh, unsigned long ops_request) | |
1430 | { | |
1431 | /* since handle_stripe can be called outside of raid5d context | |
1432 | * we need to ensure sh->ops.request is de-staged before another | |
1433 | * request arrives | |
1434 | */ | |
1435 | wait_event(sh->ops.wait_for_ops, | |
1436 | !test_and_set_bit_lock(STRIPE_OPS_REQ_PENDING, &sh->state)); | |
1437 | sh->ops.request = ops_request; | |
1438 | ||
1439 | atomic_inc(&sh->count); | |
1440 | async_schedule(async_run_ops, sh); | |
1441 | } | |
1442 | #else | |
1443 | #define raid_run_ops __raid_run_ops | |
1444 | #endif | |
1445 | ||
d1688a6d | 1446 | static int grow_one_stripe(struct r5conf *conf) |
1da177e4 LT |
1447 | { |
1448 | struct stripe_head *sh; | |
6ce32846 | 1449 | sh = kmem_cache_zalloc(conf->slab_cache, GFP_KERNEL); |
3f294f4f N |
1450 | if (!sh) |
1451 | return 0; | |
6ce32846 | 1452 | |
3f294f4f | 1453 | sh->raid_conf = conf; |
417b8d4a DW |
1454 | #ifdef CONFIG_MULTICORE_RAID456 |
1455 | init_waitqueue_head(&sh->ops.wait_for_ops); | |
1456 | #endif | |
3f294f4f | 1457 | |
e4e11e38 N |
1458 | if (grow_buffers(sh)) { |
1459 | shrink_buffers(sh); | |
3f294f4f N |
1460 | kmem_cache_free(conf->slab_cache, sh); |
1461 | return 0; | |
1462 | } | |
1463 | /* we just created an active stripe so... */ | |
1464 | atomic_set(&sh->count, 1); | |
1465 | atomic_inc(&conf->active_stripes); | |
1466 | INIT_LIST_HEAD(&sh->lru); | |
1467 | release_stripe(sh); | |
1468 | return 1; | |
1469 | } | |
1470 | ||
d1688a6d | 1471 | static int grow_stripes(struct r5conf *conf, int num) |
3f294f4f | 1472 | { |
e18b890b | 1473 | struct kmem_cache *sc; |
5e5e3e78 | 1474 | int devs = max(conf->raid_disks, conf->previous_raid_disks); |
1da177e4 | 1475 | |
f4be6b43 N |
1476 | if (conf->mddev->gendisk) |
1477 | sprintf(conf->cache_name[0], | |
1478 | "raid%d-%s", conf->level, mdname(conf->mddev)); | |
1479 | else | |
1480 | sprintf(conf->cache_name[0], | |
1481 | "raid%d-%p", conf->level, conf->mddev); | |
1482 | sprintf(conf->cache_name[1], "%s-alt", conf->cache_name[0]); | |
1483 | ||
ad01c9e3 N |
1484 | conf->active_name = 0; |
1485 | sc = kmem_cache_create(conf->cache_name[conf->active_name], | |
1da177e4 | 1486 | sizeof(struct stripe_head)+(devs-1)*sizeof(struct r5dev), |
20c2df83 | 1487 | 0, 0, NULL); |
1da177e4 LT |
1488 | if (!sc) |
1489 | return 1; | |
1490 | conf->slab_cache = sc; | |
ad01c9e3 | 1491 | conf->pool_size = devs; |
16a53ecc | 1492 | while (num--) |
3f294f4f | 1493 | if (!grow_one_stripe(conf)) |
1da177e4 | 1494 | return 1; |
1da177e4 LT |
1495 | return 0; |
1496 | } | |
29269553 | 1497 | |
d6f38f31 DW |
1498 | /** |
1499 | * scribble_len - return the required size of the scribble region | |
1500 | * @num - total number of disks in the array | |
1501 | * | |
1502 | * The size must be enough to contain: | |
1503 | * 1/ a struct page pointer for each device in the array +2 | |
1504 | * 2/ room to convert each entry in (1) to its corresponding dma | |
1505 | * (dma_map_page()) or page (page_address()) address. | |
1506 | * | |
1507 | * Note: the +2 is for the destination buffers of the ddf/raid6 case where we | |
1508 | * calculate over all devices (not just the data blocks), using zeros in place | |
1509 | * of the P and Q blocks. | |
1510 | */ | |
1511 | static size_t scribble_len(int num) | |
1512 | { | |
1513 | size_t len; | |
1514 | ||
1515 | len = sizeof(struct page *) * (num+2) + sizeof(addr_conv_t) * (num+2); | |
1516 | ||
1517 | return len; | |
1518 | } | |
1519 | ||
d1688a6d | 1520 | static int resize_stripes(struct r5conf *conf, int newsize) |
ad01c9e3 N |
1521 | { |
1522 | /* Make all the stripes able to hold 'newsize' devices. | |
1523 | * New slots in each stripe get 'page' set to a new page. | |
1524 | * | |
1525 | * This happens in stages: | |
1526 | * 1/ create a new kmem_cache and allocate the required number of | |
1527 | * stripe_heads. | |
1528 | * 2/ gather all the old stripe_heads and tranfer the pages across | |
1529 | * to the new stripe_heads. This will have the side effect of | |
1530 | * freezing the array as once all stripe_heads have been collected, | |
1531 | * no IO will be possible. Old stripe heads are freed once their | |
1532 | * pages have been transferred over, and the old kmem_cache is | |
1533 | * freed when all stripes are done. | |
1534 | * 3/ reallocate conf->disks to be suitable bigger. If this fails, | |
1535 | * we simple return a failre status - no need to clean anything up. | |
1536 | * 4/ allocate new pages for the new slots in the new stripe_heads. | |
1537 | * If this fails, we don't bother trying the shrink the | |
1538 | * stripe_heads down again, we just leave them as they are. | |
1539 | * As each stripe_head is processed the new one is released into | |
1540 | * active service. | |
1541 | * | |
1542 | * Once step2 is started, we cannot afford to wait for a write, | |
1543 | * so we use GFP_NOIO allocations. | |
1544 | */ | |
1545 | struct stripe_head *osh, *nsh; | |
1546 | LIST_HEAD(newstripes); | |
1547 | struct disk_info *ndisks; | |
d6f38f31 | 1548 | unsigned long cpu; |
b5470dc5 | 1549 | int err; |
e18b890b | 1550 | struct kmem_cache *sc; |
ad01c9e3 N |
1551 | int i; |
1552 | ||
1553 | if (newsize <= conf->pool_size) | |
1554 | return 0; /* never bother to shrink */ | |
1555 | ||
b5470dc5 DW |
1556 | err = md_allow_write(conf->mddev); |
1557 | if (err) | |
1558 | return err; | |
2a2275d6 | 1559 | |
ad01c9e3 N |
1560 | /* Step 1 */ |
1561 | sc = kmem_cache_create(conf->cache_name[1-conf->active_name], | |
1562 | sizeof(struct stripe_head)+(newsize-1)*sizeof(struct r5dev), | |
20c2df83 | 1563 | 0, 0, NULL); |
ad01c9e3 N |
1564 | if (!sc) |
1565 | return -ENOMEM; | |
1566 | ||
1567 | for (i = conf->max_nr_stripes; i; i--) { | |
6ce32846 | 1568 | nsh = kmem_cache_zalloc(sc, GFP_KERNEL); |
ad01c9e3 N |
1569 | if (!nsh) |
1570 | break; | |
1571 | ||
ad01c9e3 | 1572 | nsh->raid_conf = conf; |
417b8d4a DW |
1573 | #ifdef CONFIG_MULTICORE_RAID456 |
1574 | init_waitqueue_head(&nsh->ops.wait_for_ops); | |
1575 | #endif | |
ad01c9e3 N |
1576 | |
1577 | list_add(&nsh->lru, &newstripes); | |
1578 | } | |
1579 | if (i) { | |
1580 | /* didn't get enough, give up */ | |
1581 | while (!list_empty(&newstripes)) { | |
1582 | nsh = list_entry(newstripes.next, struct stripe_head, lru); | |
1583 | list_del(&nsh->lru); | |
1584 | kmem_cache_free(sc, nsh); | |
1585 | } | |
1586 | kmem_cache_destroy(sc); | |
1587 | return -ENOMEM; | |
1588 | } | |
1589 | /* Step 2 - Must use GFP_NOIO now. | |
1590 | * OK, we have enough stripes, start collecting inactive | |
1591 | * stripes and copying them over | |
1592 | */ | |
1593 | list_for_each_entry(nsh, &newstripes, lru) { | |
1594 | spin_lock_irq(&conf->device_lock); | |
1595 | wait_event_lock_irq(conf->wait_for_stripe, | |
1596 | !list_empty(&conf->inactive_list), | |
1597 | conf->device_lock, | |
482c0834 | 1598 | ); |
ad01c9e3 N |
1599 | osh = get_free_stripe(conf); |
1600 | spin_unlock_irq(&conf->device_lock); | |
1601 | atomic_set(&nsh->count, 1); | |
1602 | for(i=0; i<conf->pool_size; i++) | |
1603 | nsh->dev[i].page = osh->dev[i].page; | |
1604 | for( ; i<newsize; i++) | |
1605 | nsh->dev[i].page = NULL; | |
1606 | kmem_cache_free(conf->slab_cache, osh); | |
1607 | } | |
1608 | kmem_cache_destroy(conf->slab_cache); | |
1609 | ||
1610 | /* Step 3. | |
1611 | * At this point, we are holding all the stripes so the array | |
1612 | * is completely stalled, so now is a good time to resize | |
d6f38f31 | 1613 | * conf->disks and the scribble region |
ad01c9e3 N |
1614 | */ |
1615 | ndisks = kzalloc(newsize * sizeof(struct disk_info), GFP_NOIO); | |
1616 | if (ndisks) { | |
1617 | for (i=0; i<conf->raid_disks; i++) | |
1618 | ndisks[i] = conf->disks[i]; | |
1619 | kfree(conf->disks); | |
1620 | conf->disks = ndisks; | |
1621 | } else | |
1622 | err = -ENOMEM; | |
1623 | ||
d6f38f31 DW |
1624 | get_online_cpus(); |
1625 | conf->scribble_len = scribble_len(newsize); | |
1626 | for_each_present_cpu(cpu) { | |
1627 | struct raid5_percpu *percpu; | |
1628 | void *scribble; | |
1629 | ||
1630 | percpu = per_cpu_ptr(conf->percpu, cpu); | |
1631 | scribble = kmalloc(conf->scribble_len, GFP_NOIO); | |
1632 | ||
1633 | if (scribble) { | |
1634 | kfree(percpu->scribble); | |
1635 | percpu->scribble = scribble; | |
1636 | } else { | |
1637 | err = -ENOMEM; | |
1638 | break; | |
1639 | } | |
1640 | } | |
1641 | put_online_cpus(); | |
1642 | ||
ad01c9e3 N |
1643 | /* Step 4, return new stripes to service */ |
1644 | while(!list_empty(&newstripes)) { | |
1645 | nsh = list_entry(newstripes.next, struct stripe_head, lru); | |
1646 | list_del_init(&nsh->lru); | |
d6f38f31 | 1647 | |
ad01c9e3 N |
1648 | for (i=conf->raid_disks; i < newsize; i++) |
1649 | if (nsh->dev[i].page == NULL) { | |
1650 | struct page *p = alloc_page(GFP_NOIO); | |
1651 | nsh->dev[i].page = p; | |
1652 | if (!p) | |
1653 | err = -ENOMEM; | |
1654 | } | |
1655 | release_stripe(nsh); | |
1656 | } | |
1657 | /* critical section pass, GFP_NOIO no longer needed */ | |
1658 | ||
1659 | conf->slab_cache = sc; | |
1660 | conf->active_name = 1-conf->active_name; | |
1661 | conf->pool_size = newsize; | |
1662 | return err; | |
1663 | } | |
1da177e4 | 1664 | |
d1688a6d | 1665 | static int drop_one_stripe(struct r5conf *conf) |
1da177e4 LT |
1666 | { |
1667 | struct stripe_head *sh; | |
1668 | ||
3f294f4f N |
1669 | spin_lock_irq(&conf->device_lock); |
1670 | sh = get_free_stripe(conf); | |
1671 | spin_unlock_irq(&conf->device_lock); | |
1672 | if (!sh) | |
1673 | return 0; | |
78bafebd | 1674 | BUG_ON(atomic_read(&sh->count)); |
e4e11e38 | 1675 | shrink_buffers(sh); |
3f294f4f N |
1676 | kmem_cache_free(conf->slab_cache, sh); |
1677 | atomic_dec(&conf->active_stripes); | |
1678 | return 1; | |
1679 | } | |
1680 | ||
d1688a6d | 1681 | static void shrink_stripes(struct r5conf *conf) |
3f294f4f N |
1682 | { |
1683 | while (drop_one_stripe(conf)) | |
1684 | ; | |
1685 | ||
29fc7e3e N |
1686 | if (conf->slab_cache) |
1687 | kmem_cache_destroy(conf->slab_cache); | |
1da177e4 LT |
1688 | conf->slab_cache = NULL; |
1689 | } | |
1690 | ||
6712ecf8 | 1691 | static void raid5_end_read_request(struct bio * bi, int error) |
1da177e4 | 1692 | { |
99c0fb5f | 1693 | struct stripe_head *sh = bi->bi_private; |
d1688a6d | 1694 | struct r5conf *conf = sh->raid_conf; |
7ecaa1e6 | 1695 | int disks = sh->disks, i; |
1da177e4 | 1696 | int uptodate = test_bit(BIO_UPTODATE, &bi->bi_flags); |
d6950432 | 1697 | char b[BDEVNAME_SIZE]; |
dd054fce | 1698 | struct md_rdev *rdev = NULL; |
05616be5 | 1699 | sector_t s; |
1da177e4 LT |
1700 | |
1701 | for (i=0 ; i<disks; i++) | |
1702 | if (bi == &sh->dev[i].req) | |
1703 | break; | |
1704 | ||
45b4233c DW |
1705 | pr_debug("end_read_request %llu/%d, count: %d, uptodate %d.\n", |
1706 | (unsigned long long)sh->sector, i, atomic_read(&sh->count), | |
1da177e4 LT |
1707 | uptodate); |
1708 | if (i == disks) { | |
1709 | BUG(); | |
6712ecf8 | 1710 | return; |
1da177e4 | 1711 | } |
14a75d3e | 1712 | if (test_bit(R5_ReadRepl, &sh->dev[i].flags)) |
dd054fce N |
1713 | /* If replacement finished while this request was outstanding, |
1714 | * 'replacement' might be NULL already. | |
1715 | * In that case it moved down to 'rdev'. | |
1716 | * rdev is not removed until all requests are finished. | |
1717 | */ | |
14a75d3e | 1718 | rdev = conf->disks[i].replacement; |
dd054fce | 1719 | if (!rdev) |
14a75d3e | 1720 | rdev = conf->disks[i].rdev; |
1da177e4 | 1721 | |
05616be5 N |
1722 | if (use_new_offset(conf, sh)) |
1723 | s = sh->sector + rdev->new_data_offset; | |
1724 | else | |
1725 | s = sh->sector + rdev->data_offset; | |
1da177e4 | 1726 | if (uptodate) { |
1da177e4 | 1727 | set_bit(R5_UPTODATE, &sh->dev[i].flags); |
4e5314b5 | 1728 | if (test_bit(R5_ReadError, &sh->dev[i].flags)) { |
14a75d3e N |
1729 | /* Note that this cannot happen on a |
1730 | * replacement device. We just fail those on | |
1731 | * any error | |
1732 | */ | |
8bda470e CD |
1733 | printk_ratelimited( |
1734 | KERN_INFO | |
1735 | "md/raid:%s: read error corrected" | |
1736 | " (%lu sectors at %llu on %s)\n", | |
1737 | mdname(conf->mddev), STRIPE_SECTORS, | |
05616be5 | 1738 | (unsigned long long)s, |
8bda470e | 1739 | bdevname(rdev->bdev, b)); |
ddd5115f | 1740 | atomic_add(STRIPE_SECTORS, &rdev->corrected_errors); |
4e5314b5 N |
1741 | clear_bit(R5_ReadError, &sh->dev[i].flags); |
1742 | clear_bit(R5_ReWrite, &sh->dev[i].flags); | |
1743 | } | |
14a75d3e N |
1744 | if (atomic_read(&rdev->read_errors)) |
1745 | atomic_set(&rdev->read_errors, 0); | |
1da177e4 | 1746 | } else { |
14a75d3e | 1747 | const char *bdn = bdevname(rdev->bdev, b); |
ba22dcbf | 1748 | int retry = 0; |
2e8ac303 | 1749 | int set_bad = 0; |
d6950432 | 1750 | |
1da177e4 | 1751 | clear_bit(R5_UPTODATE, &sh->dev[i].flags); |
d6950432 | 1752 | atomic_inc(&rdev->read_errors); |
14a75d3e N |
1753 | if (test_bit(R5_ReadRepl, &sh->dev[i].flags)) |
1754 | printk_ratelimited( | |
1755 | KERN_WARNING | |
1756 | "md/raid:%s: read error on replacement device " | |
1757 | "(sector %llu on %s).\n", | |
1758 | mdname(conf->mddev), | |
05616be5 | 1759 | (unsigned long long)s, |
14a75d3e | 1760 | bdn); |
2e8ac303 | 1761 | else if (conf->mddev->degraded >= conf->max_degraded) { |
1762 | set_bad = 1; | |
8bda470e CD |
1763 | printk_ratelimited( |
1764 | KERN_WARNING | |
1765 | "md/raid:%s: read error not correctable " | |
1766 | "(sector %llu on %s).\n", | |
1767 | mdname(conf->mddev), | |
05616be5 | 1768 | (unsigned long long)s, |
8bda470e | 1769 | bdn); |
2e8ac303 | 1770 | } else if (test_bit(R5_ReWrite, &sh->dev[i].flags)) { |
4e5314b5 | 1771 | /* Oh, no!!! */ |
2e8ac303 | 1772 | set_bad = 1; |
8bda470e CD |
1773 | printk_ratelimited( |
1774 | KERN_WARNING | |
1775 | "md/raid:%s: read error NOT corrected!! " | |
1776 | "(sector %llu on %s).\n", | |
1777 | mdname(conf->mddev), | |
05616be5 | 1778 | (unsigned long long)s, |
8bda470e | 1779 | bdn); |
2e8ac303 | 1780 | } else if (atomic_read(&rdev->read_errors) |
ba22dcbf | 1781 | > conf->max_nr_stripes) |
14f8d26b | 1782 | printk(KERN_WARNING |
0c55e022 | 1783 | "md/raid:%s: Too many read errors, failing device %s.\n", |
d6950432 | 1784 | mdname(conf->mddev), bdn); |
ba22dcbf N |
1785 | else |
1786 | retry = 1; | |
1787 | if (retry) | |
1788 | set_bit(R5_ReadError, &sh->dev[i].flags); | |
1789 | else { | |
4e5314b5 N |
1790 | clear_bit(R5_ReadError, &sh->dev[i].flags); |
1791 | clear_bit(R5_ReWrite, &sh->dev[i].flags); | |
2e8ac303 | 1792 | if (!(set_bad |
1793 | && test_bit(In_sync, &rdev->flags) | |
1794 | && rdev_set_badblocks( | |
1795 | rdev, sh->sector, STRIPE_SECTORS, 0))) | |
1796 | md_error(conf->mddev, rdev); | |
ba22dcbf | 1797 | } |
1da177e4 | 1798 | } |
14a75d3e | 1799 | rdev_dec_pending(rdev, conf->mddev); |
1da177e4 LT |
1800 | clear_bit(R5_LOCKED, &sh->dev[i].flags); |
1801 | set_bit(STRIPE_HANDLE, &sh->state); | |
1802 | release_stripe(sh); | |
1da177e4 LT |
1803 | } |
1804 | ||
d710e138 | 1805 | static void raid5_end_write_request(struct bio *bi, int error) |
1da177e4 | 1806 | { |
99c0fb5f | 1807 | struct stripe_head *sh = bi->bi_private; |
d1688a6d | 1808 | struct r5conf *conf = sh->raid_conf; |
7ecaa1e6 | 1809 | int disks = sh->disks, i; |
977df362 | 1810 | struct md_rdev *uninitialized_var(rdev); |
1da177e4 | 1811 | int uptodate = test_bit(BIO_UPTODATE, &bi->bi_flags); |
b84db560 N |
1812 | sector_t first_bad; |
1813 | int bad_sectors; | |
977df362 | 1814 | int replacement = 0; |
1da177e4 | 1815 | |
977df362 N |
1816 | for (i = 0 ; i < disks; i++) { |
1817 | if (bi == &sh->dev[i].req) { | |
1818 | rdev = conf->disks[i].rdev; | |
1da177e4 | 1819 | break; |
977df362 N |
1820 | } |
1821 | if (bi == &sh->dev[i].rreq) { | |
1822 | rdev = conf->disks[i].replacement; | |
dd054fce N |
1823 | if (rdev) |
1824 | replacement = 1; | |
1825 | else | |
1826 | /* rdev was removed and 'replacement' | |
1827 | * replaced it. rdev is not removed | |
1828 | * until all requests are finished. | |
1829 | */ | |
1830 | rdev = conf->disks[i].rdev; | |
977df362 N |
1831 | break; |
1832 | } | |
1833 | } | |
45b4233c | 1834 | pr_debug("end_write_request %llu/%d, count %d, uptodate: %d.\n", |
1da177e4 LT |
1835 | (unsigned long long)sh->sector, i, atomic_read(&sh->count), |
1836 | uptodate); | |
1837 | if (i == disks) { | |
1838 | BUG(); | |
6712ecf8 | 1839 | return; |
1da177e4 LT |
1840 | } |
1841 | ||
977df362 N |
1842 | if (replacement) { |
1843 | if (!uptodate) | |
1844 | md_error(conf->mddev, rdev); | |
1845 | else if (is_badblock(rdev, sh->sector, | |
1846 | STRIPE_SECTORS, | |
1847 | &first_bad, &bad_sectors)) | |
1848 | set_bit(R5_MadeGoodRepl, &sh->dev[i].flags); | |
1849 | } else { | |
1850 | if (!uptodate) { | |
1851 | set_bit(WriteErrorSeen, &rdev->flags); | |
1852 | set_bit(R5_WriteError, &sh->dev[i].flags); | |
3a6de292 N |
1853 | if (!test_and_set_bit(WantReplacement, &rdev->flags)) |
1854 | set_bit(MD_RECOVERY_NEEDED, | |
1855 | &rdev->mddev->recovery); | |
977df362 N |
1856 | } else if (is_badblock(rdev, sh->sector, |
1857 | STRIPE_SECTORS, | |
1858 | &first_bad, &bad_sectors)) | |
1859 | set_bit(R5_MadeGood, &sh->dev[i].flags); | |
1860 | } | |
1861 | rdev_dec_pending(rdev, conf->mddev); | |
1da177e4 | 1862 | |
977df362 N |
1863 | if (!test_and_clear_bit(R5_DOUBLE_LOCKED, &sh->dev[i].flags)) |
1864 | clear_bit(R5_LOCKED, &sh->dev[i].flags); | |
1da177e4 | 1865 | set_bit(STRIPE_HANDLE, &sh->state); |
c04be0aa | 1866 | release_stripe(sh); |
1da177e4 LT |
1867 | } |
1868 | ||
784052ec | 1869 | static sector_t compute_blocknr(struct stripe_head *sh, int i, int previous); |
1da177e4 | 1870 | |
784052ec | 1871 | static void raid5_build_block(struct stripe_head *sh, int i, int previous) |
1da177e4 LT |
1872 | { |
1873 | struct r5dev *dev = &sh->dev[i]; | |
1874 | ||
1875 | bio_init(&dev->req); | |
1876 | dev->req.bi_io_vec = &dev->vec; | |
1877 | dev->req.bi_vcnt++; | |
1878 | dev->req.bi_max_vecs++; | |
1da177e4 | 1879 | dev->req.bi_private = sh; |
995c4275 | 1880 | dev->vec.bv_page = dev->page; |
1da177e4 | 1881 | |
977df362 N |
1882 | bio_init(&dev->rreq); |
1883 | dev->rreq.bi_io_vec = &dev->rvec; | |
1884 | dev->rreq.bi_vcnt++; | |
1885 | dev->rreq.bi_max_vecs++; | |
1886 | dev->rreq.bi_private = sh; | |
1887 | dev->rvec.bv_page = dev->page; | |
1888 | ||
1da177e4 | 1889 | dev->flags = 0; |
784052ec | 1890 | dev->sector = compute_blocknr(sh, i, previous); |
1da177e4 LT |
1891 | } |
1892 | ||
fd01b88c | 1893 | static void error(struct mddev *mddev, struct md_rdev *rdev) |
1da177e4 LT |
1894 | { |
1895 | char b[BDEVNAME_SIZE]; | |
d1688a6d | 1896 | struct r5conf *conf = mddev->private; |
908f4fbd | 1897 | unsigned long flags; |
0c55e022 | 1898 | pr_debug("raid456: error called\n"); |
1da177e4 | 1899 | |
908f4fbd N |
1900 | spin_lock_irqsave(&conf->device_lock, flags); |
1901 | clear_bit(In_sync, &rdev->flags); | |
1902 | mddev->degraded = calc_degraded(conf); | |
1903 | spin_unlock_irqrestore(&conf->device_lock, flags); | |
1904 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); | |
1905 | ||
de393cde | 1906 | set_bit(Blocked, &rdev->flags); |
6f8d0c77 N |
1907 | set_bit(Faulty, &rdev->flags); |
1908 | set_bit(MD_CHANGE_DEVS, &mddev->flags); | |
1909 | printk(KERN_ALERT | |
1910 | "md/raid:%s: Disk failure on %s, disabling device.\n" | |
1911 | "md/raid:%s: Operation continuing on %d devices.\n", | |
1912 | mdname(mddev), | |
1913 | bdevname(rdev->bdev, b), | |
1914 | mdname(mddev), | |
1915 | conf->raid_disks - mddev->degraded); | |
16a53ecc | 1916 | } |
1da177e4 LT |
1917 | |
1918 | /* | |
1919 | * Input: a 'big' sector number, | |
1920 | * Output: index of the data and parity disk, and the sector # in them. | |
1921 | */ | |
d1688a6d | 1922 | static sector_t raid5_compute_sector(struct r5conf *conf, sector_t r_sector, |
911d4ee8 N |
1923 | int previous, int *dd_idx, |
1924 | struct stripe_head *sh) | |
1da177e4 | 1925 | { |
6e3b96ed | 1926 | sector_t stripe, stripe2; |
35f2a591 | 1927 | sector_t chunk_number; |
1da177e4 | 1928 | unsigned int chunk_offset; |
911d4ee8 | 1929 | int pd_idx, qd_idx; |
67cc2b81 | 1930 | int ddf_layout = 0; |
1da177e4 | 1931 | sector_t new_sector; |
e183eaed N |
1932 | int algorithm = previous ? conf->prev_algo |
1933 | : conf->algorithm; | |
09c9e5fa AN |
1934 | int sectors_per_chunk = previous ? conf->prev_chunk_sectors |
1935 | : conf->chunk_sectors; | |
112bf897 N |
1936 | int raid_disks = previous ? conf->previous_raid_disks |
1937 | : conf->raid_disks; | |
1938 | int data_disks = raid_disks - conf->max_degraded; | |
1da177e4 LT |
1939 | |
1940 | /* First compute the information on this sector */ | |
1941 | ||
1942 | /* | |
1943 | * Compute the chunk number and the sector offset inside the chunk | |
1944 | */ | |
1945 | chunk_offset = sector_div(r_sector, sectors_per_chunk); | |
1946 | chunk_number = r_sector; | |
1da177e4 LT |
1947 | |
1948 | /* | |
1949 | * Compute the stripe number | |
1950 | */ | |
35f2a591 N |
1951 | stripe = chunk_number; |
1952 | *dd_idx = sector_div(stripe, data_disks); | |
6e3b96ed | 1953 | stripe2 = stripe; |
1da177e4 LT |
1954 | /* |
1955 | * Select the parity disk based on the user selected algorithm. | |
1956 | */ | |
84789554 | 1957 | pd_idx = qd_idx = -1; |
16a53ecc N |
1958 | switch(conf->level) { |
1959 | case 4: | |
911d4ee8 | 1960 | pd_idx = data_disks; |
16a53ecc N |
1961 | break; |
1962 | case 5: | |
e183eaed | 1963 | switch (algorithm) { |
1da177e4 | 1964 | case ALGORITHM_LEFT_ASYMMETRIC: |
6e3b96ed | 1965 | pd_idx = data_disks - sector_div(stripe2, raid_disks); |
911d4ee8 | 1966 | if (*dd_idx >= pd_idx) |
1da177e4 LT |
1967 | (*dd_idx)++; |
1968 | break; | |
1969 | case ALGORITHM_RIGHT_ASYMMETRIC: | |
6e3b96ed | 1970 | pd_idx = sector_div(stripe2, raid_disks); |
911d4ee8 | 1971 | if (*dd_idx >= pd_idx) |
1da177e4 LT |
1972 | (*dd_idx)++; |
1973 | break; | |
1974 | case ALGORITHM_LEFT_SYMMETRIC: | |
6e3b96ed | 1975 | pd_idx = data_disks - sector_div(stripe2, raid_disks); |
911d4ee8 | 1976 | *dd_idx = (pd_idx + 1 + *dd_idx) % raid_disks; |
1da177e4 LT |
1977 | break; |
1978 | case ALGORITHM_RIGHT_SYMMETRIC: | |
6e3b96ed | 1979 | pd_idx = sector_div(stripe2, raid_disks); |
911d4ee8 | 1980 | *dd_idx = (pd_idx + 1 + *dd_idx) % raid_disks; |
1da177e4 | 1981 | break; |
99c0fb5f N |
1982 | case ALGORITHM_PARITY_0: |
1983 | pd_idx = 0; | |
1984 | (*dd_idx)++; | |
1985 | break; | |
1986 | case ALGORITHM_PARITY_N: | |
1987 | pd_idx = data_disks; | |
1988 | break; | |
1da177e4 | 1989 | default: |
99c0fb5f | 1990 | BUG(); |
16a53ecc N |
1991 | } |
1992 | break; | |
1993 | case 6: | |
1994 | ||
e183eaed | 1995 | switch (algorithm) { |
16a53ecc | 1996 | case ALGORITHM_LEFT_ASYMMETRIC: |
6e3b96ed | 1997 | pd_idx = raid_disks - 1 - sector_div(stripe2, raid_disks); |
911d4ee8 N |
1998 | qd_idx = pd_idx + 1; |
1999 | if (pd_idx == raid_disks-1) { | |
99c0fb5f | 2000 | (*dd_idx)++; /* Q D D D P */ |
911d4ee8 N |
2001 | qd_idx = 0; |
2002 | } else if (*dd_idx >= pd_idx) | |
16a53ecc N |
2003 | (*dd_idx) += 2; /* D D P Q D */ |
2004 | break; | |
2005 | case ALGORITHM_RIGHT_ASYMMETRIC: | |
6e3b96ed | 2006 | pd_idx = sector_div(stripe2, raid_disks); |
911d4ee8 N |
2007 | qd_idx = pd_idx + 1; |
2008 | if (pd_idx == raid_disks-1) { | |
99c0fb5f | 2009 | (*dd_idx)++; /* Q D D D P */ |
911d4ee8 N |
2010 | qd_idx = 0; |
2011 | } else if (*dd_idx >= pd_idx) | |
16a53ecc N |
2012 | (*dd_idx) += 2; /* D D P Q D */ |
2013 | break; | |
2014 | case ALGORITHM_LEFT_SYMMETRIC: | |
6e3b96ed | 2015 | pd_idx = raid_disks - 1 - sector_div(stripe2, raid_disks); |
911d4ee8 N |
2016 | qd_idx = (pd_idx + 1) % raid_disks; |
2017 | *dd_idx = (pd_idx + 2 + *dd_idx) % raid_disks; | |
16a53ecc N |
2018 | break; |
2019 | case ALGORITHM_RIGHT_SYMMETRIC: | |
6e3b96ed | 2020 | pd_idx = sector_div(stripe2, raid_disks); |
911d4ee8 N |
2021 | qd_idx = (pd_idx + 1) % raid_disks; |
2022 | *dd_idx = (pd_idx + 2 + *dd_idx) % raid_disks; | |
16a53ecc | 2023 | break; |
99c0fb5f N |
2024 | |
2025 | case ALGORITHM_PARITY_0: | |
2026 | pd_idx = 0; | |
2027 | qd_idx = 1; | |
2028 | (*dd_idx) += 2; | |
2029 | break; | |
2030 | case ALGORITHM_PARITY_N: | |
2031 | pd_idx = data_disks; | |
2032 | qd_idx = data_disks + 1; | |
2033 | break; | |
2034 | ||
2035 | case ALGORITHM_ROTATING_ZERO_RESTART: | |
2036 | /* Exactly the same as RIGHT_ASYMMETRIC, but or | |
2037 | * of blocks for computing Q is different. | |
2038 | */ | |
6e3b96ed | 2039 | pd_idx = sector_div(stripe2, raid_disks); |
99c0fb5f N |
2040 | qd_idx = pd_idx + 1; |
2041 | if (pd_idx == raid_disks-1) { | |
2042 | (*dd_idx)++; /* Q D D D P */ | |
2043 | qd_idx = 0; | |
2044 | } else if (*dd_idx >= pd_idx) | |
2045 | (*dd_idx) += 2; /* D D P Q D */ | |
67cc2b81 | 2046 | ddf_layout = 1; |
99c0fb5f N |
2047 | break; |
2048 | ||
2049 | case ALGORITHM_ROTATING_N_RESTART: | |
2050 | /* Same a left_asymmetric, by first stripe is | |
2051 | * D D D P Q rather than | |
2052 | * Q D D D P | |
2053 | */ | |
6e3b96ed N |
2054 | stripe2 += 1; |
2055 | pd_idx = raid_disks - 1 - sector_div(stripe2, raid_disks); | |
99c0fb5f N |
2056 | qd_idx = pd_idx + 1; |
2057 | if (pd_idx == raid_disks-1) { | |
2058 | (*dd_idx)++; /* Q D D D P */ | |
2059 | qd_idx = 0; | |
2060 | } else if (*dd_idx >= pd_idx) | |
2061 | (*dd_idx) += 2; /* D D P Q D */ | |
67cc2b81 | 2062 | ddf_layout = 1; |
99c0fb5f N |
2063 | break; |
2064 | ||
2065 | case ALGORITHM_ROTATING_N_CONTINUE: | |
2066 | /* Same as left_symmetric but Q is before P */ | |
6e3b96ed | 2067 | pd_idx = raid_disks - 1 - sector_div(stripe2, raid_disks); |
99c0fb5f N |
2068 | qd_idx = (pd_idx + raid_disks - 1) % raid_disks; |
2069 | *dd_idx = (pd_idx + 1 + *dd_idx) % raid_disks; | |
67cc2b81 | 2070 | ddf_layout = 1; |
99c0fb5f N |
2071 | break; |
2072 | ||
2073 | case ALGORITHM_LEFT_ASYMMETRIC_6: | |
2074 | /* RAID5 left_asymmetric, with Q on last device */ | |
6e3b96ed | 2075 | pd_idx = data_disks - sector_div(stripe2, raid_disks-1); |
99c0fb5f N |
2076 | if (*dd_idx >= pd_idx) |
2077 | (*dd_idx)++; | |
2078 | qd_idx = raid_disks - 1; | |
2079 | break; | |
2080 | ||
2081 | case ALGORITHM_RIGHT_ASYMMETRIC_6: | |
6e3b96ed | 2082 | pd_idx = sector_div(stripe2, raid_disks-1); |
99c0fb5f N |
2083 | if (*dd_idx >= pd_idx) |
2084 | (*dd_idx)++; | |
2085 | qd_idx = raid_disks - 1; | |
2086 | break; | |
2087 | ||
2088 | case ALGORITHM_LEFT_SYMMETRIC_6: | |
6e3b96ed | 2089 | pd_idx = data_disks - sector_div(stripe2, raid_disks-1); |
99c0fb5f N |
2090 | *dd_idx = (pd_idx + 1 + *dd_idx) % (raid_disks-1); |
2091 | qd_idx = raid_disks - 1; | |
2092 | break; | |
2093 | ||
2094 | case ALGORITHM_RIGHT_SYMMETRIC_6: | |
6e3b96ed | 2095 | pd_idx = sector_div(stripe2, raid_disks-1); |
99c0fb5f N |
2096 | *dd_idx = (pd_idx + 1 + *dd_idx) % (raid_disks-1); |
2097 | qd_idx = raid_disks - 1; | |
2098 | break; | |
2099 | ||
2100 | case ALGORITHM_PARITY_0_6: | |
2101 | pd_idx = 0; | |
2102 | (*dd_idx)++; | |
2103 | qd_idx = raid_disks - 1; | |
2104 | break; | |
2105 | ||
16a53ecc | 2106 | default: |
99c0fb5f | 2107 | BUG(); |
16a53ecc N |
2108 | } |
2109 | break; | |
1da177e4 LT |
2110 | } |
2111 | ||
911d4ee8 N |
2112 | if (sh) { |
2113 | sh->pd_idx = pd_idx; | |
2114 | sh->qd_idx = qd_idx; | |
67cc2b81 | 2115 | sh->ddf_layout = ddf_layout; |
911d4ee8 | 2116 | } |
1da177e4 LT |
2117 | /* |
2118 | * Finally, compute the new sector number | |
2119 | */ | |
2120 | new_sector = (sector_t)stripe * sectors_per_chunk + chunk_offset; | |
2121 | return new_sector; | |
2122 | } | |
2123 | ||
2124 | ||
784052ec | 2125 | static sector_t compute_blocknr(struct stripe_head *sh, int i, int previous) |
1da177e4 | 2126 | { |
d1688a6d | 2127 | struct r5conf *conf = sh->raid_conf; |
b875e531 N |
2128 | int raid_disks = sh->disks; |
2129 | int data_disks = raid_disks - conf->max_degraded; | |
1da177e4 | 2130 | sector_t new_sector = sh->sector, check; |
09c9e5fa AN |
2131 | int sectors_per_chunk = previous ? conf->prev_chunk_sectors |
2132 | : conf->chunk_sectors; | |
e183eaed N |
2133 | int algorithm = previous ? conf->prev_algo |
2134 | : conf->algorithm; | |
1da177e4 LT |
2135 | sector_t stripe; |
2136 | int chunk_offset; | |
35f2a591 N |
2137 | sector_t chunk_number; |
2138 | int dummy1, dd_idx = i; | |
1da177e4 | 2139 | sector_t r_sector; |
911d4ee8 | 2140 | struct stripe_head sh2; |
1da177e4 | 2141 | |
16a53ecc | 2142 | |
1da177e4 LT |
2143 | chunk_offset = sector_div(new_sector, sectors_per_chunk); |
2144 | stripe = new_sector; | |
1da177e4 | 2145 | |
16a53ecc N |
2146 | if (i == sh->pd_idx) |
2147 | return 0; | |
2148 | switch(conf->level) { | |
2149 | case 4: break; | |
2150 | case 5: | |
e183eaed | 2151 | switch (algorithm) { |
1da177e4 LT |
2152 | case ALGORITHM_LEFT_ASYMMETRIC: |
2153 | case ALGORITHM_RIGHT_ASYMMETRIC: | |
2154 | if (i > sh->pd_idx) | |
2155 | i--; | |
2156 | break; | |
2157 | case ALGORITHM_LEFT_SYMMETRIC: | |
2158 | case ALGORITHM_RIGHT_SYMMETRIC: | |
2159 | if (i < sh->pd_idx) | |
2160 | i += raid_disks; | |
2161 | i -= (sh->pd_idx + 1); | |
2162 | break; | |
99c0fb5f N |
2163 | case ALGORITHM_PARITY_0: |
2164 | i -= 1; | |
2165 | break; | |
2166 | case ALGORITHM_PARITY_N: | |
2167 | break; | |
1da177e4 | 2168 | default: |
99c0fb5f | 2169 | BUG(); |
16a53ecc N |
2170 | } |
2171 | break; | |
2172 | case 6: | |
d0dabf7e | 2173 | if (i == sh->qd_idx) |
16a53ecc | 2174 | return 0; /* It is the Q disk */ |
e183eaed | 2175 | switch (algorithm) { |
16a53ecc N |
2176 | case ALGORITHM_LEFT_ASYMMETRIC: |
2177 | case ALGORITHM_RIGHT_ASYMMETRIC: | |
99c0fb5f N |
2178 | case ALGORITHM_ROTATING_ZERO_RESTART: |
2179 | case ALGORITHM_ROTATING_N_RESTART: | |
2180 | if (sh->pd_idx == raid_disks-1) | |
2181 | i--; /* Q D D D P */ | |
16a53ecc N |
2182 | else if (i > sh->pd_idx) |
2183 | i -= 2; /* D D P Q D */ | |
2184 | break; | |
2185 | case ALGORITHM_LEFT_SYMMETRIC: | |
2186 | case ALGORITHM_RIGHT_SYMMETRIC: | |
2187 | if (sh->pd_idx == raid_disks-1) | |
2188 | i--; /* Q D D D P */ | |
2189 | else { | |
2190 | /* D D P Q D */ | |
2191 | if (i < sh->pd_idx) | |
2192 | i += raid_disks; | |
2193 | i -= (sh->pd_idx + 2); | |
2194 | } | |
2195 | break; | |
99c0fb5f N |
2196 | case ALGORITHM_PARITY_0: |
2197 | i -= 2; | |
2198 | break; | |
2199 | case ALGORITHM_PARITY_N: | |
2200 | break; | |
2201 | case ALGORITHM_ROTATING_N_CONTINUE: | |
e4424fee | 2202 | /* Like left_symmetric, but P is before Q */ |
99c0fb5f N |
2203 | if (sh->pd_idx == 0) |
2204 | i--; /* P D D D Q */ | |
e4424fee N |
2205 | else { |
2206 | /* D D Q P D */ | |
2207 | if (i < sh->pd_idx) | |
2208 | i += raid_disks; | |
2209 | i -= (sh->pd_idx + 1); | |
2210 | } | |
99c0fb5f N |
2211 | break; |
2212 | case ALGORITHM_LEFT_ASYMMETRIC_6: | |
2213 | case ALGORITHM_RIGHT_ASYMMETRIC_6: | |
2214 | if (i > sh->pd_idx) | |
2215 | i--; | |
2216 | break; | |
2217 | case ALGORITHM_LEFT_SYMMETRIC_6: | |
2218 | case ALGORITHM_RIGHT_SYMMETRIC_6: | |
2219 | if (i < sh->pd_idx) | |
2220 | i += data_disks + 1; | |
2221 | i -= (sh->pd_idx + 1); | |
2222 | break; | |
2223 | case ALGORITHM_PARITY_0_6: | |
2224 | i -= 1; | |
2225 | break; | |
16a53ecc | 2226 | default: |
99c0fb5f | 2227 | BUG(); |
16a53ecc N |
2228 | } |
2229 | break; | |
1da177e4 LT |
2230 | } |
2231 | ||
2232 | chunk_number = stripe * data_disks + i; | |
35f2a591 | 2233 | r_sector = chunk_number * sectors_per_chunk + chunk_offset; |
1da177e4 | 2234 | |
112bf897 | 2235 | check = raid5_compute_sector(conf, r_sector, |
784052ec | 2236 | previous, &dummy1, &sh2); |
911d4ee8 N |
2237 | if (check != sh->sector || dummy1 != dd_idx || sh2.pd_idx != sh->pd_idx |
2238 | || sh2.qd_idx != sh->qd_idx) { | |
0c55e022 N |
2239 | printk(KERN_ERR "md/raid:%s: compute_blocknr: map not correct\n", |
2240 | mdname(conf->mddev)); | |
1da177e4 LT |
2241 | return 0; |
2242 | } | |
2243 | return r_sector; | |
2244 | } | |
2245 | ||
2246 | ||
600aa109 | 2247 | static void |
c0f7bddb | 2248 | schedule_reconstruction(struct stripe_head *sh, struct stripe_head_state *s, |
600aa109 | 2249 | int rcw, int expand) |
e33129d8 DW |
2250 | { |
2251 | int i, pd_idx = sh->pd_idx, disks = sh->disks; | |
d1688a6d | 2252 | struct r5conf *conf = sh->raid_conf; |
c0f7bddb | 2253 | int level = conf->level; |
e33129d8 DW |
2254 | |
2255 | if (rcw) { | |
2256 | /* if we are not expanding this is a proper write request, and | |
2257 | * there will be bios with new data to be drained into the | |
2258 | * stripe cache | |
2259 | */ | |
2260 | if (!expand) { | |
600aa109 DW |
2261 | sh->reconstruct_state = reconstruct_state_drain_run; |
2262 | set_bit(STRIPE_OP_BIODRAIN, &s->ops_request); | |
2263 | } else | |
2264 | sh->reconstruct_state = reconstruct_state_run; | |
16a53ecc | 2265 | |
ac6b53b6 | 2266 | set_bit(STRIPE_OP_RECONSTRUCT, &s->ops_request); |
e33129d8 DW |
2267 | |
2268 | for (i = disks; i--; ) { | |
2269 | struct r5dev *dev = &sh->dev[i]; | |
2270 | ||
2271 | if (dev->towrite) { | |
2272 | set_bit(R5_LOCKED, &dev->flags); | |
d8ee0728 | 2273 | set_bit(R5_Wantdrain, &dev->flags); |
e33129d8 DW |
2274 | if (!expand) |
2275 | clear_bit(R5_UPTODATE, &dev->flags); | |
600aa109 | 2276 | s->locked++; |
e33129d8 DW |
2277 | } |
2278 | } | |
c0f7bddb | 2279 | if (s->locked + conf->max_degraded == disks) |
8b3e6cdc | 2280 | if (!test_and_set_bit(STRIPE_FULL_WRITE, &sh->state)) |
c0f7bddb | 2281 | atomic_inc(&conf->pending_full_writes); |
e33129d8 | 2282 | } else { |
c0f7bddb | 2283 | BUG_ON(level == 6); |
e33129d8 DW |
2284 | BUG_ON(!(test_bit(R5_UPTODATE, &sh->dev[pd_idx].flags) || |
2285 | test_bit(R5_Wantcompute, &sh->dev[pd_idx].flags))); | |
2286 | ||
d8ee0728 | 2287 | sh->reconstruct_state = reconstruct_state_prexor_drain_run; |
600aa109 DW |
2288 | set_bit(STRIPE_OP_PREXOR, &s->ops_request); |
2289 | set_bit(STRIPE_OP_BIODRAIN, &s->ops_request); | |
ac6b53b6 | 2290 | set_bit(STRIPE_OP_RECONSTRUCT, &s->ops_request); |
e33129d8 DW |
2291 | |
2292 | for (i = disks; i--; ) { | |
2293 | struct r5dev *dev = &sh->dev[i]; | |
2294 | if (i == pd_idx) | |
2295 | continue; | |
2296 | ||
e33129d8 DW |
2297 | if (dev->towrite && |
2298 | (test_bit(R5_UPTODATE, &dev->flags) || | |
d8ee0728 DW |
2299 | test_bit(R5_Wantcompute, &dev->flags))) { |
2300 | set_bit(R5_Wantdrain, &dev->flags); | |
e33129d8 DW |
2301 | set_bit(R5_LOCKED, &dev->flags); |
2302 | clear_bit(R5_UPTODATE, &dev->flags); | |
600aa109 | 2303 | s->locked++; |
e33129d8 DW |
2304 | } |
2305 | } | |
2306 | } | |
2307 | ||
c0f7bddb | 2308 | /* keep the parity disk(s) locked while asynchronous operations |
e33129d8 DW |
2309 | * are in flight |
2310 | */ | |
2311 | set_bit(R5_LOCKED, &sh->dev[pd_idx].flags); | |
2312 | clear_bit(R5_UPTODATE, &sh->dev[pd_idx].flags); | |
600aa109 | 2313 | s->locked++; |
e33129d8 | 2314 | |
c0f7bddb YT |
2315 | if (level == 6) { |
2316 | int qd_idx = sh->qd_idx; | |
2317 | struct r5dev *dev = &sh->dev[qd_idx]; | |
2318 | ||
2319 | set_bit(R5_LOCKED, &dev->flags); | |
2320 | clear_bit(R5_UPTODATE, &dev->flags); | |
2321 | s->locked++; | |
2322 | } | |
2323 | ||
600aa109 | 2324 | pr_debug("%s: stripe %llu locked: %d ops_request: %lx\n", |
e46b272b | 2325 | __func__, (unsigned long long)sh->sector, |
600aa109 | 2326 | s->locked, s->ops_request); |
e33129d8 | 2327 | } |
16a53ecc | 2328 | |
1da177e4 LT |
2329 | /* |
2330 | * Each stripe/dev can have one or more bion attached. | |
16a53ecc | 2331 | * toread/towrite point to the first in a chain. |
1da177e4 LT |
2332 | * The bi_next chain must be in order. |
2333 | */ | |
2334 | static int add_stripe_bio(struct stripe_head *sh, struct bio *bi, int dd_idx, int forwrite) | |
2335 | { | |
2336 | struct bio **bip; | |
d1688a6d | 2337 | struct r5conf *conf = sh->raid_conf; |
72626685 | 2338 | int firstwrite=0; |
1da177e4 | 2339 | |
cbe47ec5 | 2340 | pr_debug("adding bi b#%llu to stripe s#%llu\n", |
1da177e4 LT |
2341 | (unsigned long long)bi->bi_sector, |
2342 | (unsigned long long)sh->sector); | |
2343 | ||
2344 | ||
1da177e4 | 2345 | spin_lock_irq(&conf->device_lock); |
72626685 | 2346 | if (forwrite) { |
1da177e4 | 2347 | bip = &sh->dev[dd_idx].towrite; |
72626685 N |
2348 | if (*bip == NULL && sh->dev[dd_idx].written == NULL) |
2349 | firstwrite = 1; | |
2350 | } else | |
1da177e4 LT |
2351 | bip = &sh->dev[dd_idx].toread; |
2352 | while (*bip && (*bip)->bi_sector < bi->bi_sector) { | |
2353 | if ((*bip)->bi_sector + ((*bip)->bi_size >> 9) > bi->bi_sector) | |
2354 | goto overlap; | |
2355 | bip = & (*bip)->bi_next; | |
2356 | } | |
2357 | if (*bip && (*bip)->bi_sector < bi->bi_sector + ((bi->bi_size)>>9)) | |
2358 | goto overlap; | |
2359 | ||
78bafebd | 2360 | BUG_ON(*bip && bi->bi_next && (*bip) != bi->bi_next); |
1da177e4 LT |
2361 | if (*bip) |
2362 | bi->bi_next = *bip; | |
2363 | *bip = bi; | |
960e739d | 2364 | bi->bi_phys_segments++; |
72626685 | 2365 | |
1da177e4 LT |
2366 | if (forwrite) { |
2367 | /* check if page is covered */ | |
2368 | sector_t sector = sh->dev[dd_idx].sector; | |
2369 | for (bi=sh->dev[dd_idx].towrite; | |
2370 | sector < sh->dev[dd_idx].sector + STRIPE_SECTORS && | |
2371 | bi && bi->bi_sector <= sector; | |
2372 | bi = r5_next_bio(bi, sh->dev[dd_idx].sector)) { | |
2373 | if (bi->bi_sector + (bi->bi_size>>9) >= sector) | |
2374 | sector = bi->bi_sector + (bi->bi_size>>9); | |
2375 | } | |
2376 | if (sector >= sh->dev[dd_idx].sector + STRIPE_SECTORS) | |
2377 | set_bit(R5_OVERWRITE, &sh->dev[dd_idx].flags); | |
2378 | } | |
cbe47ec5 | 2379 | spin_unlock_irq(&conf->device_lock); |
cbe47ec5 N |
2380 | |
2381 | pr_debug("added bi b#%llu to stripe s#%llu, disk %d.\n", | |
2382 | (unsigned long long)(*bip)->bi_sector, | |
2383 | (unsigned long long)sh->sector, dd_idx); | |
2384 | ||
2385 | if (conf->mddev->bitmap && firstwrite) { | |
2386 | bitmap_startwrite(conf->mddev->bitmap, sh->sector, | |
2387 | STRIPE_SECTORS, 0); | |
2388 | sh->bm_seq = conf->seq_flush+1; | |
2389 | set_bit(STRIPE_BIT_DELAY, &sh->state); | |
2390 | } | |
1da177e4 LT |
2391 | return 1; |
2392 | ||
2393 | overlap: | |
2394 | set_bit(R5_Overlap, &sh->dev[dd_idx].flags); | |
2395 | spin_unlock_irq(&conf->device_lock); | |
1da177e4 LT |
2396 | return 0; |
2397 | } | |
2398 | ||
d1688a6d | 2399 | static void end_reshape(struct r5conf *conf); |
29269553 | 2400 | |
d1688a6d | 2401 | static void stripe_set_idx(sector_t stripe, struct r5conf *conf, int previous, |
911d4ee8 | 2402 | struct stripe_head *sh) |
ccfcc3c1 | 2403 | { |
784052ec | 2404 | int sectors_per_chunk = |
09c9e5fa | 2405 | previous ? conf->prev_chunk_sectors : conf->chunk_sectors; |
911d4ee8 | 2406 | int dd_idx; |
2d2063ce | 2407 | int chunk_offset = sector_div(stripe, sectors_per_chunk); |
112bf897 | 2408 | int disks = previous ? conf->previous_raid_disks : conf->raid_disks; |
2d2063ce | 2409 | |
112bf897 N |
2410 | raid5_compute_sector(conf, |
2411 | stripe * (disks - conf->max_degraded) | |
b875e531 | 2412 | *sectors_per_chunk + chunk_offset, |
112bf897 | 2413 | previous, |
911d4ee8 | 2414 | &dd_idx, sh); |
ccfcc3c1 N |
2415 | } |
2416 | ||
a4456856 | 2417 | static void |
d1688a6d | 2418 | handle_failed_stripe(struct r5conf *conf, struct stripe_head *sh, |
a4456856 DW |
2419 | struct stripe_head_state *s, int disks, |
2420 | struct bio **return_bi) | |
2421 | { | |
2422 | int i; | |
2423 | for (i = disks; i--; ) { | |
2424 | struct bio *bi; | |
2425 | int bitmap_end = 0; | |
2426 | ||
2427 | if (test_bit(R5_ReadError, &sh->dev[i].flags)) { | |
3cb03002 | 2428 | struct md_rdev *rdev; |
a4456856 DW |
2429 | rcu_read_lock(); |
2430 | rdev = rcu_dereference(conf->disks[i].rdev); | |
2431 | if (rdev && test_bit(In_sync, &rdev->flags)) | |
7f0da59b N |
2432 | atomic_inc(&rdev->nr_pending); |
2433 | else | |
2434 | rdev = NULL; | |
a4456856 | 2435 | rcu_read_unlock(); |
7f0da59b N |
2436 | if (rdev) { |
2437 | if (!rdev_set_badblocks( | |
2438 | rdev, | |
2439 | sh->sector, | |
2440 | STRIPE_SECTORS, 0)) | |
2441 | md_error(conf->mddev, rdev); | |
2442 | rdev_dec_pending(rdev, conf->mddev); | |
2443 | } | |
a4456856 DW |
2444 | } |
2445 | spin_lock_irq(&conf->device_lock); | |
2446 | /* fail all writes first */ | |
2447 | bi = sh->dev[i].towrite; | |
2448 | sh->dev[i].towrite = NULL; | |
2449 | if (bi) { | |
2450 | s->to_write--; | |
2451 | bitmap_end = 1; | |
2452 | } | |
2453 | ||
2454 | if (test_and_clear_bit(R5_Overlap, &sh->dev[i].flags)) | |
2455 | wake_up(&conf->wait_for_overlap); | |
2456 | ||
2457 | while (bi && bi->bi_sector < | |
2458 | sh->dev[i].sector + STRIPE_SECTORS) { | |
2459 | struct bio *nextbi = r5_next_bio(bi, sh->dev[i].sector); | |
2460 | clear_bit(BIO_UPTODATE, &bi->bi_flags); | |
960e739d | 2461 | if (!raid5_dec_bi_phys_segments(bi)) { |
a4456856 DW |
2462 | md_write_end(conf->mddev); |
2463 | bi->bi_next = *return_bi; | |
2464 | *return_bi = bi; | |
2465 | } | |
2466 | bi = nextbi; | |
2467 | } | |
2468 | /* and fail all 'written' */ | |
2469 | bi = sh->dev[i].written; | |
2470 | sh->dev[i].written = NULL; | |
2471 | if (bi) bitmap_end = 1; | |
2472 | while (bi && bi->bi_sector < | |
2473 | sh->dev[i].sector + STRIPE_SECTORS) { | |
2474 | struct bio *bi2 = r5_next_bio(bi, sh->dev[i].sector); | |
2475 | clear_bit(BIO_UPTODATE, &bi->bi_flags); | |
960e739d | 2476 | if (!raid5_dec_bi_phys_segments(bi)) { |
a4456856 DW |
2477 | md_write_end(conf->mddev); |
2478 | bi->bi_next = *return_bi; | |
2479 | *return_bi = bi; | |
2480 | } | |
2481 | bi = bi2; | |
2482 | } | |
2483 | ||
b5e98d65 DW |
2484 | /* fail any reads if this device is non-operational and |
2485 | * the data has not reached the cache yet. | |
2486 | */ | |
2487 | if (!test_bit(R5_Wantfill, &sh->dev[i].flags) && | |
2488 | (!test_bit(R5_Insync, &sh->dev[i].flags) || | |
2489 | test_bit(R5_ReadError, &sh->dev[i].flags))) { | |
a4456856 DW |
2490 | bi = sh->dev[i].toread; |
2491 | sh->dev[i].toread = NULL; | |
2492 | if (test_and_clear_bit(R5_Overlap, &sh->dev[i].flags)) | |
2493 | wake_up(&conf->wait_for_overlap); | |
2494 | if (bi) s->to_read--; | |
2495 | while (bi && bi->bi_sector < | |
2496 | sh->dev[i].sector + STRIPE_SECTORS) { | |
2497 | struct bio *nextbi = | |
2498 | r5_next_bio(bi, sh->dev[i].sector); | |
2499 | clear_bit(BIO_UPTODATE, &bi->bi_flags); | |
960e739d | 2500 | if (!raid5_dec_bi_phys_segments(bi)) { |
a4456856 DW |
2501 | bi->bi_next = *return_bi; |
2502 | *return_bi = bi; | |
2503 | } | |
2504 | bi = nextbi; | |
2505 | } | |
2506 | } | |
2507 | spin_unlock_irq(&conf->device_lock); | |
2508 | if (bitmap_end) | |
2509 | bitmap_endwrite(conf->mddev->bitmap, sh->sector, | |
2510 | STRIPE_SECTORS, 0, 0); | |
8cfa7b0f N |
2511 | /* If we were in the middle of a write the parity block might |
2512 | * still be locked - so just clear all R5_LOCKED flags | |
2513 | */ | |
2514 | clear_bit(R5_LOCKED, &sh->dev[i].flags); | |
a4456856 DW |
2515 | } |
2516 | ||
8b3e6cdc DW |
2517 | if (test_and_clear_bit(STRIPE_FULL_WRITE, &sh->state)) |
2518 | if (atomic_dec_and_test(&conf->pending_full_writes)) | |
2519 | md_wakeup_thread(conf->mddev->thread); | |
a4456856 DW |
2520 | } |
2521 | ||
7f0da59b | 2522 | static void |
d1688a6d | 2523 | handle_failed_sync(struct r5conf *conf, struct stripe_head *sh, |
7f0da59b N |
2524 | struct stripe_head_state *s) |
2525 | { | |
2526 | int abort = 0; | |
2527 | int i; | |
2528 | ||
7f0da59b N |
2529 | clear_bit(STRIPE_SYNCING, &sh->state); |
2530 | s->syncing = 0; | |
9a3e1101 | 2531 | s->replacing = 0; |
7f0da59b | 2532 | /* There is nothing more to do for sync/check/repair. |
18b9837e N |
2533 | * Don't even need to abort as that is handled elsewhere |
2534 | * if needed, and not always wanted e.g. if there is a known | |
2535 | * bad block here. | |
9a3e1101 | 2536 | * For recover/replace we need to record a bad block on all |
7f0da59b N |
2537 | * non-sync devices, or abort the recovery |
2538 | */ | |
18b9837e N |
2539 | if (test_bit(MD_RECOVERY_RECOVER, &conf->mddev->recovery)) { |
2540 | /* During recovery devices cannot be removed, so | |
2541 | * locking and refcounting of rdevs is not needed | |
2542 | */ | |
2543 | for (i = 0; i < conf->raid_disks; i++) { | |
2544 | struct md_rdev *rdev = conf->disks[i].rdev; | |
2545 | if (rdev | |
2546 | && !test_bit(Faulty, &rdev->flags) | |
2547 | && !test_bit(In_sync, &rdev->flags) | |
2548 | && !rdev_set_badblocks(rdev, sh->sector, | |
2549 | STRIPE_SECTORS, 0)) | |
2550 | abort = 1; | |
2551 | rdev = conf->disks[i].replacement; | |
2552 | if (rdev | |
2553 | && !test_bit(Faulty, &rdev->flags) | |
2554 | && !test_bit(In_sync, &rdev->flags) | |
2555 | && !rdev_set_badblocks(rdev, sh->sector, | |
2556 | STRIPE_SECTORS, 0)) | |
2557 | abort = 1; | |
2558 | } | |
2559 | if (abort) | |
2560 | conf->recovery_disabled = | |
2561 | conf->mddev->recovery_disabled; | |
7f0da59b | 2562 | } |
18b9837e | 2563 | md_done_sync(conf->mddev, STRIPE_SECTORS, !abort); |
7f0da59b N |
2564 | } |
2565 | ||
9a3e1101 N |
2566 | static int want_replace(struct stripe_head *sh, int disk_idx) |
2567 | { | |
2568 | struct md_rdev *rdev; | |
2569 | int rv = 0; | |
2570 | /* Doing recovery so rcu locking not required */ | |
2571 | rdev = sh->raid_conf->disks[disk_idx].replacement; | |
2572 | if (rdev | |
2573 | && !test_bit(Faulty, &rdev->flags) | |
2574 | && !test_bit(In_sync, &rdev->flags) | |
2575 | && (rdev->recovery_offset <= sh->sector | |
2576 | || rdev->mddev->recovery_cp <= sh->sector)) | |
2577 | rv = 1; | |
2578 | ||
2579 | return rv; | |
2580 | } | |
2581 | ||
93b3dbce | 2582 | /* fetch_block - checks the given member device to see if its data needs |
1fe797e6 DW |
2583 | * to be read or computed to satisfy a request. |
2584 | * | |
2585 | * Returns 1 when no more member devices need to be checked, otherwise returns | |
93b3dbce | 2586 | * 0 to tell the loop in handle_stripe_fill to continue |
f38e1219 | 2587 | */ |
93b3dbce N |
2588 | static int fetch_block(struct stripe_head *sh, struct stripe_head_state *s, |
2589 | int disk_idx, int disks) | |
a4456856 | 2590 | { |
5599becc | 2591 | struct r5dev *dev = &sh->dev[disk_idx]; |
f2b3b44d N |
2592 | struct r5dev *fdev[2] = { &sh->dev[s->failed_num[0]], |
2593 | &sh->dev[s->failed_num[1]] }; | |
5599becc | 2594 | |
93b3dbce | 2595 | /* is the data in this block needed, and can we get it? */ |
5599becc YT |
2596 | if (!test_bit(R5_LOCKED, &dev->flags) && |
2597 | !test_bit(R5_UPTODATE, &dev->flags) && | |
2598 | (dev->toread || | |
2599 | (dev->towrite && !test_bit(R5_OVERWRITE, &dev->flags)) || | |
2600 | s->syncing || s->expanding || | |
9a3e1101 | 2601 | (s->replacing && want_replace(sh, disk_idx)) || |
5d35e09c N |
2602 | (s->failed >= 1 && fdev[0]->toread) || |
2603 | (s->failed >= 2 && fdev[1]->toread) || | |
93b3dbce N |
2604 | (sh->raid_conf->level <= 5 && s->failed && fdev[0]->towrite && |
2605 | !test_bit(R5_OVERWRITE, &fdev[0]->flags)) || | |
2606 | (sh->raid_conf->level == 6 && s->failed && s->to_write))) { | |
5599becc YT |
2607 | /* we would like to get this block, possibly by computing it, |
2608 | * otherwise read it if the backing disk is insync | |
2609 | */ | |
2610 | BUG_ON(test_bit(R5_Wantcompute, &dev->flags)); | |
2611 | BUG_ON(test_bit(R5_Wantread, &dev->flags)); | |
2612 | if ((s->uptodate == disks - 1) && | |
f2b3b44d N |
2613 | (s->failed && (disk_idx == s->failed_num[0] || |
2614 | disk_idx == s->failed_num[1]))) { | |
5599becc YT |
2615 | /* have disk failed, and we're requested to fetch it; |
2616 | * do compute it | |
a4456856 | 2617 | */ |
5599becc YT |
2618 | pr_debug("Computing stripe %llu block %d\n", |
2619 | (unsigned long long)sh->sector, disk_idx); | |
2620 | set_bit(STRIPE_COMPUTE_RUN, &sh->state); | |
2621 | set_bit(STRIPE_OP_COMPUTE_BLK, &s->ops_request); | |
2622 | set_bit(R5_Wantcompute, &dev->flags); | |
2623 | sh->ops.target = disk_idx; | |
2624 | sh->ops.target2 = -1; /* no 2nd target */ | |
2625 | s->req_compute = 1; | |
93b3dbce N |
2626 | /* Careful: from this point on 'uptodate' is in the eye |
2627 | * of raid_run_ops which services 'compute' operations | |
2628 | * before writes. R5_Wantcompute flags a block that will | |
2629 | * be R5_UPTODATE by the time it is needed for a | |
2630 | * subsequent operation. | |
2631 | */ | |
5599becc YT |
2632 | s->uptodate++; |
2633 | return 1; | |
2634 | } else if (s->uptodate == disks-2 && s->failed >= 2) { | |
2635 | /* Computing 2-failure is *very* expensive; only | |
2636 | * do it if failed >= 2 | |
2637 | */ | |
2638 | int other; | |
2639 | for (other = disks; other--; ) { | |
2640 | if (other == disk_idx) | |
2641 | continue; | |
2642 | if (!test_bit(R5_UPTODATE, | |
2643 | &sh->dev[other].flags)) | |
2644 | break; | |
a4456856 | 2645 | } |
5599becc YT |
2646 | BUG_ON(other < 0); |
2647 | pr_debug("Computing stripe %llu blocks %d,%d\n", | |
2648 | (unsigned long long)sh->sector, | |
2649 | disk_idx, other); | |
2650 | set_bit(STRIPE_COMPUTE_RUN, &sh->state); | |
2651 | set_bit(STRIPE_OP_COMPUTE_BLK, &s->ops_request); | |
2652 | set_bit(R5_Wantcompute, &sh->dev[disk_idx].flags); | |
2653 | set_bit(R5_Wantcompute, &sh->dev[other].flags); | |
2654 | sh->ops.target = disk_idx; | |
2655 | sh->ops.target2 = other; | |
2656 | s->uptodate += 2; | |
2657 | s->req_compute = 1; | |
2658 | return 1; | |
2659 | } else if (test_bit(R5_Insync, &dev->flags)) { | |
2660 | set_bit(R5_LOCKED, &dev->flags); | |
2661 | set_bit(R5_Wantread, &dev->flags); | |
2662 | s->locked++; | |
2663 | pr_debug("Reading block %d (sync=%d)\n", | |
2664 | disk_idx, s->syncing); | |
a4456856 DW |
2665 | } |
2666 | } | |
5599becc YT |
2667 | |
2668 | return 0; | |
2669 | } | |
2670 | ||
2671 | /** | |
93b3dbce | 2672 | * handle_stripe_fill - read or compute data to satisfy pending requests. |
5599becc | 2673 | */ |
93b3dbce N |
2674 | static void handle_stripe_fill(struct stripe_head *sh, |
2675 | struct stripe_head_state *s, | |
2676 | int disks) | |
5599becc YT |
2677 | { |
2678 | int i; | |
2679 | ||
2680 | /* look for blocks to read/compute, skip this if a compute | |
2681 | * is already in flight, or if the stripe contents are in the | |
2682 | * midst of changing due to a write | |
2683 | */ | |
2684 | if (!test_bit(STRIPE_COMPUTE_RUN, &sh->state) && !sh->check_state && | |
2685 | !sh->reconstruct_state) | |
2686 | for (i = disks; i--; ) | |
93b3dbce | 2687 | if (fetch_block(sh, s, i, disks)) |
5599becc | 2688 | break; |
a4456856 DW |
2689 | set_bit(STRIPE_HANDLE, &sh->state); |
2690 | } | |
2691 | ||
2692 | ||
1fe797e6 | 2693 | /* handle_stripe_clean_event |
a4456856 DW |
2694 | * any written block on an uptodate or failed drive can be returned. |
2695 | * Note that if we 'wrote' to a failed drive, it will be UPTODATE, but | |
2696 | * never LOCKED, so we don't need to test 'failed' directly. | |
2697 | */ | |
d1688a6d | 2698 | static void handle_stripe_clean_event(struct r5conf *conf, |
a4456856 DW |
2699 | struct stripe_head *sh, int disks, struct bio **return_bi) |
2700 | { | |
2701 | int i; | |
2702 | struct r5dev *dev; | |
2703 | ||
2704 | for (i = disks; i--; ) | |
2705 | if (sh->dev[i].written) { | |
2706 | dev = &sh->dev[i]; | |
2707 | if (!test_bit(R5_LOCKED, &dev->flags) && | |
2708 | test_bit(R5_UPTODATE, &dev->flags)) { | |
2709 | /* We can return any write requests */ | |
2710 | struct bio *wbi, *wbi2; | |
2711 | int bitmap_end = 0; | |
45b4233c | 2712 | pr_debug("Return write for disc %d\n", i); |
a4456856 DW |
2713 | spin_lock_irq(&conf->device_lock); |
2714 | wbi = dev->written; | |
2715 | dev->written = NULL; | |
2716 | while (wbi && wbi->bi_sector < | |
2717 | dev->sector + STRIPE_SECTORS) { | |
2718 | wbi2 = r5_next_bio(wbi, dev->sector); | |
960e739d | 2719 | if (!raid5_dec_bi_phys_segments(wbi)) { |
a4456856 DW |
2720 | md_write_end(conf->mddev); |
2721 | wbi->bi_next = *return_bi; | |
2722 | *return_bi = wbi; | |
2723 | } | |
2724 | wbi = wbi2; | |
2725 | } | |
2726 | if (dev->towrite == NULL) | |
2727 | bitmap_end = 1; | |
2728 | spin_unlock_irq(&conf->device_lock); | |
2729 | if (bitmap_end) | |
2730 | bitmap_endwrite(conf->mddev->bitmap, | |
2731 | sh->sector, | |
2732 | STRIPE_SECTORS, | |
2733 | !test_bit(STRIPE_DEGRADED, &sh->state), | |
2734 | 0); | |
2735 | } | |
2736 | } | |
8b3e6cdc DW |
2737 | |
2738 | if (test_and_clear_bit(STRIPE_FULL_WRITE, &sh->state)) | |
2739 | if (atomic_dec_and_test(&conf->pending_full_writes)) | |
2740 | md_wakeup_thread(conf->mddev->thread); | |
a4456856 DW |
2741 | } |
2742 | ||
d1688a6d | 2743 | static void handle_stripe_dirtying(struct r5conf *conf, |
c8ac1803 N |
2744 | struct stripe_head *sh, |
2745 | struct stripe_head_state *s, | |
2746 | int disks) | |
a4456856 DW |
2747 | { |
2748 | int rmw = 0, rcw = 0, i; | |
c8ac1803 N |
2749 | if (conf->max_degraded == 2) { |
2750 | /* RAID6 requires 'rcw' in current implementation | |
2751 | * Calculate the real rcw later - for now fake it | |
2752 | * look like rcw is cheaper | |
2753 | */ | |
2754 | rcw = 1; rmw = 2; | |
2755 | } else for (i = disks; i--; ) { | |
a4456856 DW |
2756 | /* would I have to read this buffer for read_modify_write */ |
2757 | struct r5dev *dev = &sh->dev[i]; | |
2758 | if ((dev->towrite || i == sh->pd_idx) && | |
2759 | !test_bit(R5_LOCKED, &dev->flags) && | |
f38e1219 DW |
2760 | !(test_bit(R5_UPTODATE, &dev->flags) || |
2761 | test_bit(R5_Wantcompute, &dev->flags))) { | |
a4456856 DW |
2762 | if (test_bit(R5_Insync, &dev->flags)) |
2763 | rmw++; | |
2764 | else | |
2765 | rmw += 2*disks; /* cannot read it */ | |
2766 | } | |
2767 | /* Would I have to read this buffer for reconstruct_write */ | |
2768 | if (!test_bit(R5_OVERWRITE, &dev->flags) && i != sh->pd_idx && | |
2769 | !test_bit(R5_LOCKED, &dev->flags) && | |
f38e1219 DW |
2770 | !(test_bit(R5_UPTODATE, &dev->flags) || |
2771 | test_bit(R5_Wantcompute, &dev->flags))) { | |
2772 | if (test_bit(R5_Insync, &dev->flags)) rcw++; | |
a4456856 DW |
2773 | else |
2774 | rcw += 2*disks; | |
2775 | } | |
2776 | } | |
45b4233c | 2777 | pr_debug("for sector %llu, rmw=%d rcw=%d\n", |
a4456856 DW |
2778 | (unsigned long long)sh->sector, rmw, rcw); |
2779 | set_bit(STRIPE_HANDLE, &sh->state); | |
2780 | if (rmw < rcw && rmw > 0) | |
2781 | /* prefer read-modify-write, but need to get some data */ | |
2782 | for (i = disks; i--; ) { | |
2783 | struct r5dev *dev = &sh->dev[i]; | |
2784 | if ((dev->towrite || i == sh->pd_idx) && | |
2785 | !test_bit(R5_LOCKED, &dev->flags) && | |
f38e1219 DW |
2786 | !(test_bit(R5_UPTODATE, &dev->flags) || |
2787 | test_bit(R5_Wantcompute, &dev->flags)) && | |
a4456856 DW |
2788 | test_bit(R5_Insync, &dev->flags)) { |
2789 | if ( | |
2790 | test_bit(STRIPE_PREREAD_ACTIVE, &sh->state)) { | |
45b4233c | 2791 | pr_debug("Read_old block " |
a4456856 DW |
2792 | "%d for r-m-w\n", i); |
2793 | set_bit(R5_LOCKED, &dev->flags); | |
2794 | set_bit(R5_Wantread, &dev->flags); | |
2795 | s->locked++; | |
2796 | } else { | |
2797 | set_bit(STRIPE_DELAYED, &sh->state); | |
2798 | set_bit(STRIPE_HANDLE, &sh->state); | |
2799 | } | |
2800 | } | |
2801 | } | |
c8ac1803 | 2802 | if (rcw <= rmw && rcw > 0) { |
a4456856 | 2803 | /* want reconstruct write, but need to get some data */ |
c8ac1803 | 2804 | rcw = 0; |
a4456856 DW |
2805 | for (i = disks; i--; ) { |
2806 | struct r5dev *dev = &sh->dev[i]; | |
2807 | if (!test_bit(R5_OVERWRITE, &dev->flags) && | |
c8ac1803 | 2808 | i != sh->pd_idx && i != sh->qd_idx && |
a4456856 | 2809 | !test_bit(R5_LOCKED, &dev->flags) && |
f38e1219 | 2810 | !(test_bit(R5_UPTODATE, &dev->flags) || |
c8ac1803 N |
2811 | test_bit(R5_Wantcompute, &dev->flags))) { |
2812 | rcw++; | |
2813 | if (!test_bit(R5_Insync, &dev->flags)) | |
2814 | continue; /* it's a failed drive */ | |
a4456856 DW |
2815 | if ( |
2816 | test_bit(STRIPE_PREREAD_ACTIVE, &sh->state)) { | |
45b4233c | 2817 | pr_debug("Read_old block " |
a4456856 DW |
2818 | "%d for Reconstruct\n", i); |
2819 | set_bit(R5_LOCKED, &dev->flags); | |
2820 | set_bit(R5_Wantread, &dev->flags); | |
2821 | s->locked++; | |
2822 | } else { | |
2823 | set_bit(STRIPE_DELAYED, &sh->state); | |
2824 | set_bit(STRIPE_HANDLE, &sh->state); | |
2825 | } | |
2826 | } | |
2827 | } | |
c8ac1803 | 2828 | } |
a4456856 DW |
2829 | /* now if nothing is locked, and if we have enough data, |
2830 | * we can start a write request | |
2831 | */ | |
f38e1219 DW |
2832 | /* since handle_stripe can be called at any time we need to handle the |
2833 | * case where a compute block operation has been submitted and then a | |
ac6b53b6 DW |
2834 | * subsequent call wants to start a write request. raid_run_ops only |
2835 | * handles the case where compute block and reconstruct are requested | |
f38e1219 DW |
2836 | * simultaneously. If this is not the case then new writes need to be |
2837 | * held off until the compute completes. | |
2838 | */ | |
976ea8d4 DW |
2839 | if ((s->req_compute || !test_bit(STRIPE_COMPUTE_RUN, &sh->state)) && |
2840 | (s->locked == 0 && (rcw == 0 || rmw == 0) && | |
2841 | !test_bit(STRIPE_BIT_DELAY, &sh->state))) | |
c0f7bddb | 2842 | schedule_reconstruction(sh, s, rcw == 0, 0); |
a4456856 DW |
2843 | } |
2844 | ||
d1688a6d | 2845 | static void handle_parity_checks5(struct r5conf *conf, struct stripe_head *sh, |
a4456856 DW |
2846 | struct stripe_head_state *s, int disks) |
2847 | { | |
ecc65c9b | 2848 | struct r5dev *dev = NULL; |
bd2ab670 | 2849 | |
a4456856 | 2850 | set_bit(STRIPE_HANDLE, &sh->state); |
e89f8962 | 2851 | |
ecc65c9b DW |
2852 | switch (sh->check_state) { |
2853 | case check_state_idle: | |
2854 | /* start a new check operation if there are no failures */ | |
bd2ab670 | 2855 | if (s->failed == 0) { |
bd2ab670 | 2856 | BUG_ON(s->uptodate != disks); |
ecc65c9b DW |
2857 | sh->check_state = check_state_run; |
2858 | set_bit(STRIPE_OP_CHECK, &s->ops_request); | |
bd2ab670 | 2859 | clear_bit(R5_UPTODATE, &sh->dev[sh->pd_idx].flags); |
bd2ab670 | 2860 | s->uptodate--; |
ecc65c9b | 2861 | break; |
bd2ab670 | 2862 | } |
f2b3b44d | 2863 | dev = &sh->dev[s->failed_num[0]]; |
ecc65c9b DW |
2864 | /* fall through */ |
2865 | case check_state_compute_result: | |
2866 | sh->check_state = check_state_idle; | |
2867 | if (!dev) | |
2868 | dev = &sh->dev[sh->pd_idx]; | |
2869 | ||
2870 | /* check that a write has not made the stripe insync */ | |
2871 | if (test_bit(STRIPE_INSYNC, &sh->state)) | |
2872 | break; | |
c8894419 | 2873 | |
a4456856 | 2874 | /* either failed parity check, or recovery is happening */ |
a4456856 DW |
2875 | BUG_ON(!test_bit(R5_UPTODATE, &dev->flags)); |
2876 | BUG_ON(s->uptodate != disks); | |
2877 | ||
2878 | set_bit(R5_LOCKED, &dev->flags); | |
ecc65c9b | 2879 | s->locked++; |
a4456856 | 2880 | set_bit(R5_Wantwrite, &dev->flags); |
830ea016 | 2881 | |
a4456856 | 2882 | clear_bit(STRIPE_DEGRADED, &sh->state); |
a4456856 | 2883 | set_bit(STRIPE_INSYNC, &sh->state); |
ecc65c9b DW |
2884 | break; |
2885 | case check_state_run: | |
2886 | break; /* we will be called again upon completion */ | |
2887 | case check_state_check_result: | |
2888 | sh->check_state = check_state_idle; | |
2889 | ||
2890 | /* if a failure occurred during the check operation, leave | |
2891 | * STRIPE_INSYNC not set and let the stripe be handled again | |
2892 | */ | |
2893 | if (s->failed) | |
2894 | break; | |
2895 | ||
2896 | /* handle a successful check operation, if parity is correct | |
2897 | * we are done. Otherwise update the mismatch count and repair | |
2898 | * parity if !MD_RECOVERY_CHECK | |
2899 | */ | |
ad283ea4 | 2900 | if ((sh->ops.zero_sum_result & SUM_CHECK_P_RESULT) == 0) |
ecc65c9b DW |
2901 | /* parity is correct (on disc, |
2902 | * not in buffer any more) | |
2903 | */ | |
2904 | set_bit(STRIPE_INSYNC, &sh->state); | |
2905 | else { | |
2906 | conf->mddev->resync_mismatches += STRIPE_SECTORS; | |
2907 | if (test_bit(MD_RECOVERY_CHECK, &conf->mddev->recovery)) | |
2908 | /* don't try to repair!! */ | |
2909 | set_bit(STRIPE_INSYNC, &sh->state); | |
2910 | else { | |
2911 | sh->check_state = check_state_compute_run; | |
976ea8d4 | 2912 | set_bit(STRIPE_COMPUTE_RUN, &sh->state); |
ecc65c9b DW |
2913 | set_bit(STRIPE_OP_COMPUTE_BLK, &s->ops_request); |
2914 | set_bit(R5_Wantcompute, | |
2915 | &sh->dev[sh->pd_idx].flags); | |
2916 | sh->ops.target = sh->pd_idx; | |
ac6b53b6 | 2917 | sh->ops.target2 = -1; |
ecc65c9b DW |
2918 | s->uptodate++; |
2919 | } | |
2920 | } | |
2921 | break; | |
2922 | case check_state_compute_run: | |
2923 | break; | |
2924 | default: | |
2925 | printk(KERN_ERR "%s: unknown check_state: %d sector: %llu\n", | |
2926 | __func__, sh->check_state, | |
2927 | (unsigned long long) sh->sector); | |
2928 | BUG(); | |
a4456856 DW |
2929 | } |
2930 | } | |
2931 | ||
2932 | ||
d1688a6d | 2933 | static void handle_parity_checks6(struct r5conf *conf, struct stripe_head *sh, |
36d1c647 | 2934 | struct stripe_head_state *s, |
f2b3b44d | 2935 | int disks) |
a4456856 | 2936 | { |
a4456856 | 2937 | int pd_idx = sh->pd_idx; |
34e04e87 | 2938 | int qd_idx = sh->qd_idx; |
d82dfee0 | 2939 | struct r5dev *dev; |
a4456856 DW |
2940 | |
2941 | set_bit(STRIPE_HANDLE, &sh->state); | |
2942 | ||
2943 | BUG_ON(s->failed > 2); | |
d82dfee0 | 2944 | |
a4456856 DW |
2945 | /* Want to check and possibly repair P and Q. |
2946 | * However there could be one 'failed' device, in which | |
2947 | * case we can only check one of them, possibly using the | |
2948 | * other to generate missing data | |
2949 | */ | |
2950 | ||
d82dfee0 DW |
2951 | switch (sh->check_state) { |
2952 | case check_state_idle: | |
2953 | /* start a new check operation if there are < 2 failures */ | |
f2b3b44d | 2954 | if (s->failed == s->q_failed) { |
d82dfee0 | 2955 | /* The only possible failed device holds Q, so it |
a4456856 DW |
2956 | * makes sense to check P (If anything else were failed, |
2957 | * we would have used P to recreate it). | |
2958 | */ | |
d82dfee0 | 2959 | sh->check_state = check_state_run; |
a4456856 | 2960 | } |
f2b3b44d | 2961 | if (!s->q_failed && s->failed < 2) { |
d82dfee0 | 2962 | /* Q is not failed, and we didn't use it to generate |
a4456856 DW |
2963 | * anything, so it makes sense to check it |
2964 | */ | |
d82dfee0 DW |
2965 | if (sh->check_state == check_state_run) |
2966 | sh->check_state = check_state_run_pq; | |
2967 | else | |
2968 | sh->check_state = check_state_run_q; | |
a4456856 | 2969 | } |
a4456856 | 2970 | |
d82dfee0 DW |
2971 | /* discard potentially stale zero_sum_result */ |
2972 | sh->ops.zero_sum_result = 0; | |
a4456856 | 2973 | |
d82dfee0 DW |
2974 | if (sh->check_state == check_state_run) { |
2975 | /* async_xor_zero_sum destroys the contents of P */ | |
2976 | clear_bit(R5_UPTODATE, &sh->dev[pd_idx].flags); | |
2977 | s->uptodate--; | |
a4456856 | 2978 | } |
d82dfee0 DW |
2979 | if (sh->check_state >= check_state_run && |
2980 | sh->check_state <= check_state_run_pq) { | |
2981 | /* async_syndrome_zero_sum preserves P and Q, so | |
2982 | * no need to mark them !uptodate here | |
2983 | */ | |
2984 | set_bit(STRIPE_OP_CHECK, &s->ops_request); | |
2985 | break; | |
a4456856 DW |
2986 | } |
2987 | ||
d82dfee0 DW |
2988 | /* we have 2-disk failure */ |
2989 | BUG_ON(s->failed != 2); | |
2990 | /* fall through */ | |
2991 | case check_state_compute_result: | |
2992 | sh->check_state = check_state_idle; | |
a4456856 | 2993 | |
d82dfee0 DW |
2994 | /* check that a write has not made the stripe insync */ |
2995 | if (test_bit(STRIPE_INSYNC, &sh->state)) | |
2996 | break; | |
a4456856 DW |
2997 | |
2998 | /* now write out any block on a failed drive, | |
d82dfee0 | 2999 | * or P or Q if they were recomputed |
a4456856 | 3000 | */ |
d82dfee0 | 3001 | BUG_ON(s->uptodate < disks - 1); /* We don't need Q to recover */ |
a4456856 | 3002 | if (s->failed == 2) { |
f2b3b44d | 3003 | dev = &sh->dev[s->failed_num[1]]; |
a4456856 DW |
3004 | s->locked++; |
3005 | set_bit(R5_LOCKED, &dev->flags); | |
3006 | set_bit(R5_Wantwrite, &dev->flags); | |
3007 | } | |
3008 | if (s->failed >= 1) { | |
f2b3b44d | 3009 | dev = &sh->dev[s->failed_num[0]]; |
a4456856 DW |
3010 | s->locked++; |
3011 | set_bit(R5_LOCKED, &dev->flags); | |
3012 | set_bit(R5_Wantwrite, &dev->flags); | |
3013 | } | |
d82dfee0 | 3014 | if (sh->ops.zero_sum_result & SUM_CHECK_P_RESULT) { |
a4456856 DW |
3015 | dev = &sh->dev[pd_idx]; |
3016 | s->locked++; | |
3017 | set_bit(R5_LOCKED, &dev->flags); | |
3018 | set_bit(R5_Wantwrite, &dev->flags); | |
3019 | } | |
d82dfee0 | 3020 | if (sh->ops.zero_sum_result & SUM_CHECK_Q_RESULT) { |
a4456856 DW |
3021 | dev = &sh->dev[qd_idx]; |
3022 | s->locked++; | |
3023 | set_bit(R5_LOCKED, &dev->flags); | |
3024 | set_bit(R5_Wantwrite, &dev->flags); | |
3025 | } | |
3026 | clear_bit(STRIPE_DEGRADED, &sh->state); | |
3027 | ||
3028 | set_bit(STRIPE_INSYNC, &sh->state); | |
d82dfee0 DW |
3029 | break; |
3030 | case check_state_run: | |
3031 | case check_state_run_q: | |
3032 | case check_state_run_pq: | |
3033 | break; /* we will be called again upon completion */ | |
3034 | case check_state_check_result: | |
3035 | sh->check_state = check_state_idle; | |
3036 | ||
3037 | /* handle a successful check operation, if parity is correct | |
3038 | * we are done. Otherwise update the mismatch count and repair | |
3039 | * parity if !MD_RECOVERY_CHECK | |
3040 | */ | |
3041 | if (sh->ops.zero_sum_result == 0) { | |
3042 | /* both parities are correct */ | |
3043 | if (!s->failed) | |
3044 | set_bit(STRIPE_INSYNC, &sh->state); | |
3045 | else { | |
3046 | /* in contrast to the raid5 case we can validate | |
3047 | * parity, but still have a failure to write | |
3048 | * back | |
3049 | */ | |
3050 | sh->check_state = check_state_compute_result; | |
3051 | /* Returning at this point means that we may go | |
3052 | * off and bring p and/or q uptodate again so | |
3053 | * we make sure to check zero_sum_result again | |
3054 | * to verify if p or q need writeback | |
3055 | */ | |
3056 | } | |
3057 | } else { | |
3058 | conf->mddev->resync_mismatches += STRIPE_SECTORS; | |
3059 | if (test_bit(MD_RECOVERY_CHECK, &conf->mddev->recovery)) | |
3060 | /* don't try to repair!! */ | |
3061 | set_bit(STRIPE_INSYNC, &sh->state); | |
3062 | else { | |
3063 | int *target = &sh->ops.target; | |
3064 | ||
3065 | sh->ops.target = -1; | |
3066 | sh->ops.target2 = -1; | |
3067 | sh->check_state = check_state_compute_run; | |
3068 | set_bit(STRIPE_COMPUTE_RUN, &sh->state); | |
3069 | set_bit(STRIPE_OP_COMPUTE_BLK, &s->ops_request); | |
3070 | if (sh->ops.zero_sum_result & SUM_CHECK_P_RESULT) { | |
3071 | set_bit(R5_Wantcompute, | |
3072 | &sh->dev[pd_idx].flags); | |
3073 | *target = pd_idx; | |
3074 | target = &sh->ops.target2; | |
3075 | s->uptodate++; | |
3076 | } | |
3077 | if (sh->ops.zero_sum_result & SUM_CHECK_Q_RESULT) { | |
3078 | set_bit(R5_Wantcompute, | |
3079 | &sh->dev[qd_idx].flags); | |
3080 | *target = qd_idx; | |
3081 | s->uptodate++; | |
3082 | } | |
3083 | } | |
3084 | } | |
3085 | break; | |
3086 | case check_state_compute_run: | |
3087 | break; | |
3088 | default: | |
3089 | printk(KERN_ERR "%s: unknown check_state: %d sector: %llu\n", | |
3090 | __func__, sh->check_state, | |
3091 | (unsigned long long) sh->sector); | |
3092 | BUG(); | |
a4456856 DW |
3093 | } |
3094 | } | |
3095 | ||
d1688a6d | 3096 | static void handle_stripe_expansion(struct r5conf *conf, struct stripe_head *sh) |
a4456856 DW |
3097 | { |
3098 | int i; | |
3099 | ||
3100 | /* We have read all the blocks in this stripe and now we need to | |
3101 | * copy some of them into a target stripe for expand. | |
3102 | */ | |
f0a50d37 | 3103 | struct dma_async_tx_descriptor *tx = NULL; |
a4456856 DW |
3104 | clear_bit(STRIPE_EXPAND_SOURCE, &sh->state); |
3105 | for (i = 0; i < sh->disks; i++) | |
34e04e87 | 3106 | if (i != sh->pd_idx && i != sh->qd_idx) { |
911d4ee8 | 3107 | int dd_idx, j; |
a4456856 | 3108 | struct stripe_head *sh2; |
a08abd8c | 3109 | struct async_submit_ctl submit; |
a4456856 | 3110 | |
784052ec | 3111 | sector_t bn = compute_blocknr(sh, i, 1); |
911d4ee8 N |
3112 | sector_t s = raid5_compute_sector(conf, bn, 0, |
3113 | &dd_idx, NULL); | |
a8c906ca | 3114 | sh2 = get_active_stripe(conf, s, 0, 1, 1); |
a4456856 DW |
3115 | if (sh2 == NULL) |
3116 | /* so far only the early blocks of this stripe | |
3117 | * have been requested. When later blocks | |
3118 | * get requested, we will try again | |
3119 | */ | |
3120 | continue; | |
3121 | if (!test_bit(STRIPE_EXPANDING, &sh2->state) || | |
3122 | test_bit(R5_Expanded, &sh2->dev[dd_idx].flags)) { | |
3123 | /* must have already done this block */ | |
3124 | release_stripe(sh2); | |
3125 | continue; | |
3126 | } | |
f0a50d37 DW |
3127 | |
3128 | /* place all the copies on one channel */ | |
a08abd8c | 3129 | init_async_submit(&submit, 0, tx, NULL, NULL, NULL); |
f0a50d37 | 3130 | tx = async_memcpy(sh2->dev[dd_idx].page, |
88ba2aa5 | 3131 | sh->dev[i].page, 0, 0, STRIPE_SIZE, |
a08abd8c | 3132 | &submit); |
f0a50d37 | 3133 | |
a4456856 DW |
3134 | set_bit(R5_Expanded, &sh2->dev[dd_idx].flags); |
3135 | set_bit(R5_UPTODATE, &sh2->dev[dd_idx].flags); | |
3136 | for (j = 0; j < conf->raid_disks; j++) | |
3137 | if (j != sh2->pd_idx && | |
86c374ba | 3138 | j != sh2->qd_idx && |
a4456856 DW |
3139 | !test_bit(R5_Expanded, &sh2->dev[j].flags)) |
3140 | break; | |
3141 | if (j == conf->raid_disks) { | |
3142 | set_bit(STRIPE_EXPAND_READY, &sh2->state); | |
3143 | set_bit(STRIPE_HANDLE, &sh2->state); | |
3144 | } | |
3145 | release_stripe(sh2); | |
f0a50d37 | 3146 | |
a4456856 | 3147 | } |
a2e08551 N |
3148 | /* done submitting copies, wait for them to complete */ |
3149 | if (tx) { | |
3150 | async_tx_ack(tx); | |
3151 | dma_wait_for_async_tx(tx); | |
3152 | } | |
a4456856 | 3153 | } |
1da177e4 LT |
3154 | |
3155 | /* | |
3156 | * handle_stripe - do things to a stripe. | |
3157 | * | |
9a3e1101 N |
3158 | * We lock the stripe by setting STRIPE_ACTIVE and then examine the |
3159 | * state of various bits to see what needs to be done. | |
1da177e4 | 3160 | * Possible results: |
9a3e1101 N |
3161 | * return some read requests which now have data |
3162 | * return some write requests which are safely on storage | |
1da177e4 LT |
3163 | * schedule a read on some buffers |
3164 | * schedule a write of some buffers | |
3165 | * return confirmation of parity correctness | |
3166 | * | |
1da177e4 | 3167 | */ |
a4456856 | 3168 | |
acfe726b | 3169 | static void analyse_stripe(struct stripe_head *sh, struct stripe_head_state *s) |
1da177e4 | 3170 | { |
d1688a6d | 3171 | struct r5conf *conf = sh->raid_conf; |
f416885e | 3172 | int disks = sh->disks; |
474af965 N |
3173 | struct r5dev *dev; |
3174 | int i; | |
9a3e1101 | 3175 | int do_recovery = 0; |
1da177e4 | 3176 | |
acfe726b N |
3177 | memset(s, 0, sizeof(*s)); |
3178 | ||
acfe726b N |
3179 | s->expanding = test_bit(STRIPE_EXPAND_SOURCE, &sh->state); |
3180 | s->expanded = test_bit(STRIPE_EXPAND_READY, &sh->state); | |
3181 | s->failed_num[0] = -1; | |
3182 | s->failed_num[1] = -1; | |
1da177e4 | 3183 | |
acfe726b | 3184 | /* Now to look around and see what can be done */ |
1da177e4 | 3185 | rcu_read_lock(); |
c4c1663b | 3186 | spin_lock_irq(&conf->device_lock); |
16a53ecc | 3187 | for (i=disks; i--; ) { |
3cb03002 | 3188 | struct md_rdev *rdev; |
31c176ec N |
3189 | sector_t first_bad; |
3190 | int bad_sectors; | |
3191 | int is_bad = 0; | |
acfe726b | 3192 | |
16a53ecc | 3193 | dev = &sh->dev[i]; |
1da177e4 | 3194 | |
45b4233c | 3195 | pr_debug("check %d: state 0x%lx read %p write %p written %p\n", |
9a3e1101 N |
3196 | i, dev->flags, |
3197 | dev->toread, dev->towrite, dev->written); | |
6c0069c0 YT |
3198 | /* maybe we can reply to a read |
3199 | * | |
3200 | * new wantfill requests are only permitted while | |
3201 | * ops_complete_biofill is guaranteed to be inactive | |
3202 | */ | |
3203 | if (test_bit(R5_UPTODATE, &dev->flags) && dev->toread && | |
3204 | !test_bit(STRIPE_BIOFILL_RUN, &sh->state)) | |
3205 | set_bit(R5_Wantfill, &dev->flags); | |
1da177e4 | 3206 | |
16a53ecc | 3207 | /* now count some things */ |
cc94015a N |
3208 | if (test_bit(R5_LOCKED, &dev->flags)) |
3209 | s->locked++; | |
3210 | if (test_bit(R5_UPTODATE, &dev->flags)) | |
3211 | s->uptodate++; | |
2d6e4ecc | 3212 | if (test_bit(R5_Wantcompute, &dev->flags)) { |
cc94015a N |
3213 | s->compute++; |
3214 | BUG_ON(s->compute > 2); | |
2d6e4ecc | 3215 | } |
1da177e4 | 3216 | |
acfe726b | 3217 | if (test_bit(R5_Wantfill, &dev->flags)) |
cc94015a | 3218 | s->to_fill++; |
acfe726b | 3219 | else if (dev->toread) |
cc94015a | 3220 | s->to_read++; |
16a53ecc | 3221 | if (dev->towrite) { |
cc94015a | 3222 | s->to_write++; |
16a53ecc | 3223 | if (!test_bit(R5_OVERWRITE, &dev->flags)) |
cc94015a | 3224 | s->non_overwrite++; |
16a53ecc | 3225 | } |
a4456856 | 3226 | if (dev->written) |
cc94015a | 3227 | s->written++; |
14a75d3e N |
3228 | /* Prefer to use the replacement for reads, but only |
3229 | * if it is recovered enough and has no bad blocks. | |
3230 | */ | |
3231 | rdev = rcu_dereference(conf->disks[i].replacement); | |
3232 | if (rdev && !test_bit(Faulty, &rdev->flags) && | |
3233 | rdev->recovery_offset >= sh->sector + STRIPE_SECTORS && | |
3234 | !is_badblock(rdev, sh->sector, STRIPE_SECTORS, | |
3235 | &first_bad, &bad_sectors)) | |
3236 | set_bit(R5_ReadRepl, &dev->flags); | |
3237 | else { | |
9a3e1101 N |
3238 | if (rdev) |
3239 | set_bit(R5_NeedReplace, &dev->flags); | |
14a75d3e N |
3240 | rdev = rcu_dereference(conf->disks[i].rdev); |
3241 | clear_bit(R5_ReadRepl, &dev->flags); | |
3242 | } | |
9283d8c5 N |
3243 | if (rdev && test_bit(Faulty, &rdev->flags)) |
3244 | rdev = NULL; | |
31c176ec N |
3245 | if (rdev) { |
3246 | is_bad = is_badblock(rdev, sh->sector, STRIPE_SECTORS, | |
3247 | &first_bad, &bad_sectors); | |
3248 | if (s->blocked_rdev == NULL | |
3249 | && (test_bit(Blocked, &rdev->flags) | |
3250 | || is_bad < 0)) { | |
3251 | if (is_bad < 0) | |
3252 | set_bit(BlockedBadBlocks, | |
3253 | &rdev->flags); | |
3254 | s->blocked_rdev = rdev; | |
3255 | atomic_inc(&rdev->nr_pending); | |
3256 | } | |
6bfe0b49 | 3257 | } |
415e72d0 N |
3258 | clear_bit(R5_Insync, &dev->flags); |
3259 | if (!rdev) | |
3260 | /* Not in-sync */; | |
31c176ec N |
3261 | else if (is_bad) { |
3262 | /* also not in-sync */ | |
18b9837e N |
3263 | if (!test_bit(WriteErrorSeen, &rdev->flags) && |
3264 | test_bit(R5_UPTODATE, &dev->flags)) { | |
31c176ec N |
3265 | /* treat as in-sync, but with a read error |
3266 | * which we can now try to correct | |
3267 | */ | |
3268 | set_bit(R5_Insync, &dev->flags); | |
3269 | set_bit(R5_ReadError, &dev->flags); | |
3270 | } | |
3271 | } else if (test_bit(In_sync, &rdev->flags)) | |
415e72d0 | 3272 | set_bit(R5_Insync, &dev->flags); |
30d7a483 | 3273 | else if (sh->sector + STRIPE_SECTORS <= rdev->recovery_offset) |
415e72d0 | 3274 | /* in sync if before recovery_offset */ |
30d7a483 N |
3275 | set_bit(R5_Insync, &dev->flags); |
3276 | else if (test_bit(R5_UPTODATE, &dev->flags) && | |
3277 | test_bit(R5_Expanded, &dev->flags)) | |
3278 | /* If we've reshaped into here, we assume it is Insync. | |
3279 | * We will shortly update recovery_offset to make | |
3280 | * it official. | |
3281 | */ | |
3282 | set_bit(R5_Insync, &dev->flags); | |
3283 | ||
5d8c71f9 | 3284 | if (rdev && test_bit(R5_WriteError, &dev->flags)) { |
14a75d3e N |
3285 | /* This flag does not apply to '.replacement' |
3286 | * only to .rdev, so make sure to check that*/ | |
3287 | struct md_rdev *rdev2 = rcu_dereference( | |
3288 | conf->disks[i].rdev); | |
3289 | if (rdev2 == rdev) | |
3290 | clear_bit(R5_Insync, &dev->flags); | |
3291 | if (rdev2 && !test_bit(Faulty, &rdev2->flags)) { | |
bc2607f3 | 3292 | s->handle_bad_blocks = 1; |
14a75d3e | 3293 | atomic_inc(&rdev2->nr_pending); |
bc2607f3 N |
3294 | } else |
3295 | clear_bit(R5_WriteError, &dev->flags); | |
3296 | } | |
5d8c71f9 | 3297 | if (rdev && test_bit(R5_MadeGood, &dev->flags)) { |
14a75d3e N |
3298 | /* This flag does not apply to '.replacement' |
3299 | * only to .rdev, so make sure to check that*/ | |
3300 | struct md_rdev *rdev2 = rcu_dereference( | |
3301 | conf->disks[i].rdev); | |
3302 | if (rdev2 && !test_bit(Faulty, &rdev2->flags)) { | |
b84db560 | 3303 | s->handle_bad_blocks = 1; |
14a75d3e | 3304 | atomic_inc(&rdev2->nr_pending); |
b84db560 N |
3305 | } else |
3306 | clear_bit(R5_MadeGood, &dev->flags); | |
3307 | } | |
977df362 N |
3308 | if (test_bit(R5_MadeGoodRepl, &dev->flags)) { |
3309 | struct md_rdev *rdev2 = rcu_dereference( | |
3310 | conf->disks[i].replacement); | |
3311 | if (rdev2 && !test_bit(Faulty, &rdev2->flags)) { | |
3312 | s->handle_bad_blocks = 1; | |
3313 | atomic_inc(&rdev2->nr_pending); | |
3314 | } else | |
3315 | clear_bit(R5_MadeGoodRepl, &dev->flags); | |
3316 | } | |
415e72d0 | 3317 | if (!test_bit(R5_Insync, &dev->flags)) { |
16a53ecc N |
3318 | /* The ReadError flag will just be confusing now */ |
3319 | clear_bit(R5_ReadError, &dev->flags); | |
3320 | clear_bit(R5_ReWrite, &dev->flags); | |
1da177e4 | 3321 | } |
415e72d0 N |
3322 | if (test_bit(R5_ReadError, &dev->flags)) |
3323 | clear_bit(R5_Insync, &dev->flags); | |
3324 | if (!test_bit(R5_Insync, &dev->flags)) { | |
cc94015a N |
3325 | if (s->failed < 2) |
3326 | s->failed_num[s->failed] = i; | |
3327 | s->failed++; | |
9a3e1101 N |
3328 | if (rdev && !test_bit(Faulty, &rdev->flags)) |
3329 | do_recovery = 1; | |
415e72d0 | 3330 | } |
1da177e4 | 3331 | } |
c4c1663b | 3332 | spin_unlock_irq(&conf->device_lock); |
9a3e1101 N |
3333 | if (test_bit(STRIPE_SYNCING, &sh->state)) { |
3334 | /* If there is a failed device being replaced, | |
3335 | * we must be recovering. | |
3336 | * else if we are after recovery_cp, we must be syncing | |
c6d2e084 | 3337 | * else if MD_RECOVERY_REQUESTED is set, we also are syncing. |
9a3e1101 N |
3338 | * else we can only be replacing |
3339 | * sync and recovery both need to read all devices, and so | |
3340 | * use the same flag. | |
3341 | */ | |
3342 | if (do_recovery || | |
c6d2e084 | 3343 | sh->sector >= conf->mddev->recovery_cp || |
3344 | test_bit(MD_RECOVERY_REQUESTED, &(conf->mddev->recovery))) | |
9a3e1101 N |
3345 | s->syncing = 1; |
3346 | else | |
3347 | s->replacing = 1; | |
3348 | } | |
1da177e4 | 3349 | rcu_read_unlock(); |
cc94015a N |
3350 | } |
3351 | ||
3352 | static void handle_stripe(struct stripe_head *sh) | |
3353 | { | |
3354 | struct stripe_head_state s; | |
d1688a6d | 3355 | struct r5conf *conf = sh->raid_conf; |
3687c061 | 3356 | int i; |
84789554 N |
3357 | int prexor; |
3358 | int disks = sh->disks; | |
474af965 | 3359 | struct r5dev *pdev, *qdev; |
cc94015a N |
3360 | |
3361 | clear_bit(STRIPE_HANDLE, &sh->state); | |
257a4b42 | 3362 | if (test_and_set_bit_lock(STRIPE_ACTIVE, &sh->state)) { |
cc94015a N |
3363 | /* already being handled, ensure it gets handled |
3364 | * again when current action finishes */ | |
3365 | set_bit(STRIPE_HANDLE, &sh->state); | |
3366 | return; | |
3367 | } | |
3368 | ||
3369 | if (test_and_clear_bit(STRIPE_SYNC_REQUESTED, &sh->state)) { | |
3370 | set_bit(STRIPE_SYNCING, &sh->state); | |
3371 | clear_bit(STRIPE_INSYNC, &sh->state); | |
3372 | } | |
3373 | clear_bit(STRIPE_DELAYED, &sh->state); | |
3374 | ||
3375 | pr_debug("handling stripe %llu, state=%#lx cnt=%d, " | |
3376 | "pd_idx=%d, qd_idx=%d\n, check:%d, reconstruct:%d\n", | |
3377 | (unsigned long long)sh->sector, sh->state, | |
3378 | atomic_read(&sh->count), sh->pd_idx, sh->qd_idx, | |
3379 | sh->check_state, sh->reconstruct_state); | |
3687c061 | 3380 | |
acfe726b | 3381 | analyse_stripe(sh, &s); |
c5a31000 | 3382 | |
bc2607f3 N |
3383 | if (s.handle_bad_blocks) { |
3384 | set_bit(STRIPE_HANDLE, &sh->state); | |
3385 | goto finish; | |
3386 | } | |
3387 | ||
474af965 N |
3388 | if (unlikely(s.blocked_rdev)) { |
3389 | if (s.syncing || s.expanding || s.expanded || | |
9a3e1101 | 3390 | s.replacing || s.to_write || s.written) { |
474af965 N |
3391 | set_bit(STRIPE_HANDLE, &sh->state); |
3392 | goto finish; | |
3393 | } | |
3394 | /* There is nothing for the blocked_rdev to block */ | |
3395 | rdev_dec_pending(s.blocked_rdev, conf->mddev); | |
3396 | s.blocked_rdev = NULL; | |
3397 | } | |
3398 | ||
3399 | if (s.to_fill && !test_bit(STRIPE_BIOFILL_RUN, &sh->state)) { | |
3400 | set_bit(STRIPE_OP_BIOFILL, &s.ops_request); | |
3401 | set_bit(STRIPE_BIOFILL_RUN, &sh->state); | |
3402 | } | |
3403 | ||
3404 | pr_debug("locked=%d uptodate=%d to_read=%d" | |
3405 | " to_write=%d failed=%d failed_num=%d,%d\n", | |
3406 | s.locked, s.uptodate, s.to_read, s.to_write, s.failed, | |
3407 | s.failed_num[0], s.failed_num[1]); | |
3408 | /* check if the array has lost more than max_degraded devices and, | |
3409 | * if so, some requests might need to be failed. | |
3410 | */ | |
9a3f530f N |
3411 | if (s.failed > conf->max_degraded) { |
3412 | sh->check_state = 0; | |
3413 | sh->reconstruct_state = 0; | |
3414 | if (s.to_read+s.to_write+s.written) | |
3415 | handle_failed_stripe(conf, sh, &s, disks, &s.return_bi); | |
9a3e1101 | 3416 | if (s.syncing + s.replacing) |
9a3f530f N |
3417 | handle_failed_sync(conf, sh, &s); |
3418 | } | |
474af965 N |
3419 | |
3420 | /* | |
3421 | * might be able to return some write requests if the parity blocks | |
3422 | * are safe, or on a failed drive | |
3423 | */ | |
3424 | pdev = &sh->dev[sh->pd_idx]; | |
3425 | s.p_failed = (s.failed >= 1 && s.failed_num[0] == sh->pd_idx) | |
3426 | || (s.failed >= 2 && s.failed_num[1] == sh->pd_idx); | |
3427 | qdev = &sh->dev[sh->qd_idx]; | |
3428 | s.q_failed = (s.failed >= 1 && s.failed_num[0] == sh->qd_idx) | |
3429 | || (s.failed >= 2 && s.failed_num[1] == sh->qd_idx) | |
3430 | || conf->level < 6; | |
3431 | ||
3432 | if (s.written && | |
3433 | (s.p_failed || ((test_bit(R5_Insync, &pdev->flags) | |
3434 | && !test_bit(R5_LOCKED, &pdev->flags) | |
3435 | && test_bit(R5_UPTODATE, &pdev->flags)))) && | |
3436 | (s.q_failed || ((test_bit(R5_Insync, &qdev->flags) | |
3437 | && !test_bit(R5_LOCKED, &qdev->flags) | |
3438 | && test_bit(R5_UPTODATE, &qdev->flags))))) | |
3439 | handle_stripe_clean_event(conf, sh, disks, &s.return_bi); | |
3440 | ||
3441 | /* Now we might consider reading some blocks, either to check/generate | |
3442 | * parity, or to satisfy requests | |
3443 | * or to load a block that is being partially written. | |
3444 | */ | |
3445 | if (s.to_read || s.non_overwrite | |
3446 | || (conf->level == 6 && s.to_write && s.failed) | |
9a3e1101 N |
3447 | || (s.syncing && (s.uptodate + s.compute < disks)) |
3448 | || s.replacing | |
3449 | || s.expanding) | |
474af965 N |
3450 | handle_stripe_fill(sh, &s, disks); |
3451 | ||
84789554 N |
3452 | /* Now we check to see if any write operations have recently |
3453 | * completed | |
3454 | */ | |
3455 | prexor = 0; | |
3456 | if (sh->reconstruct_state == reconstruct_state_prexor_drain_result) | |
3457 | prexor = 1; | |
3458 | if (sh->reconstruct_state == reconstruct_state_drain_result || | |
3459 | sh->reconstruct_state == reconstruct_state_prexor_drain_result) { | |
3460 | sh->reconstruct_state = reconstruct_state_idle; | |
3461 | ||
3462 | /* All the 'written' buffers and the parity block are ready to | |
3463 | * be written back to disk | |
3464 | */ | |
3465 | BUG_ON(!test_bit(R5_UPTODATE, &sh->dev[sh->pd_idx].flags)); | |
3466 | BUG_ON(sh->qd_idx >= 0 && | |
3467 | !test_bit(R5_UPTODATE, &sh->dev[sh->qd_idx].flags)); | |
3468 | for (i = disks; i--; ) { | |
3469 | struct r5dev *dev = &sh->dev[i]; | |
3470 | if (test_bit(R5_LOCKED, &dev->flags) && | |
3471 | (i == sh->pd_idx || i == sh->qd_idx || | |
3472 | dev->written)) { | |
3473 | pr_debug("Writing block %d\n", i); | |
3474 | set_bit(R5_Wantwrite, &dev->flags); | |
3475 | if (prexor) | |
3476 | continue; | |
3477 | if (!test_bit(R5_Insync, &dev->flags) || | |
3478 | ((i == sh->pd_idx || i == sh->qd_idx) && | |
3479 | s.failed == 0)) | |
3480 | set_bit(STRIPE_INSYNC, &sh->state); | |
3481 | } | |
3482 | } | |
3483 | if (test_and_clear_bit(STRIPE_PREREAD_ACTIVE, &sh->state)) | |
3484 | s.dec_preread_active = 1; | |
3485 | } | |
3486 | ||
3487 | /* Now to consider new write requests and what else, if anything | |
3488 | * should be read. We do not handle new writes when: | |
3489 | * 1/ A 'write' operation (copy+xor) is already in flight. | |
3490 | * 2/ A 'check' operation is in flight, as it may clobber the parity | |
3491 | * block. | |
3492 | */ | |
3493 | if (s.to_write && !sh->reconstruct_state && !sh->check_state) | |
3494 | handle_stripe_dirtying(conf, sh, &s, disks); | |
3495 | ||
3496 | /* maybe we need to check and possibly fix the parity for this stripe | |
3497 | * Any reads will already have been scheduled, so we just see if enough | |
3498 | * data is available. The parity check is held off while parity | |
3499 | * dependent operations are in flight. | |
3500 | */ | |
3501 | if (sh->check_state || | |
3502 | (s.syncing && s.locked == 0 && | |
3503 | !test_bit(STRIPE_COMPUTE_RUN, &sh->state) && | |
3504 | !test_bit(STRIPE_INSYNC, &sh->state))) { | |
3505 | if (conf->level == 6) | |
3506 | handle_parity_checks6(conf, sh, &s, disks); | |
3507 | else | |
3508 | handle_parity_checks5(conf, sh, &s, disks); | |
3509 | } | |
c5a31000 | 3510 | |
9a3e1101 N |
3511 | if (s.replacing && s.locked == 0 |
3512 | && !test_bit(STRIPE_INSYNC, &sh->state)) { | |
3513 | /* Write out to replacement devices where possible */ | |
3514 | for (i = 0; i < conf->raid_disks; i++) | |
3515 | if (test_bit(R5_UPTODATE, &sh->dev[i].flags) && | |
3516 | test_bit(R5_NeedReplace, &sh->dev[i].flags)) { | |
3517 | set_bit(R5_WantReplace, &sh->dev[i].flags); | |
3518 | set_bit(R5_LOCKED, &sh->dev[i].flags); | |
3519 | s.locked++; | |
3520 | } | |
3521 | set_bit(STRIPE_INSYNC, &sh->state); | |
3522 | } | |
3523 | if ((s.syncing || s.replacing) && s.locked == 0 && | |
3524 | test_bit(STRIPE_INSYNC, &sh->state)) { | |
c5a31000 N |
3525 | md_done_sync(conf->mddev, STRIPE_SECTORS, 1); |
3526 | clear_bit(STRIPE_SYNCING, &sh->state); | |
3527 | } | |
3528 | ||
3529 | /* If the failed drives are just a ReadError, then we might need | |
3530 | * to progress the repair/check process | |
3531 | */ | |
3532 | if (s.failed <= conf->max_degraded && !conf->mddev->ro) | |
3533 | for (i = 0; i < s.failed; i++) { | |
3534 | struct r5dev *dev = &sh->dev[s.failed_num[i]]; | |
3535 | if (test_bit(R5_ReadError, &dev->flags) | |
3536 | && !test_bit(R5_LOCKED, &dev->flags) | |
3537 | && test_bit(R5_UPTODATE, &dev->flags) | |
3538 | ) { | |
3539 | if (!test_bit(R5_ReWrite, &dev->flags)) { | |
3540 | set_bit(R5_Wantwrite, &dev->flags); | |
3541 | set_bit(R5_ReWrite, &dev->flags); | |
3542 | set_bit(R5_LOCKED, &dev->flags); | |
3543 | s.locked++; | |
3544 | } else { | |
3545 | /* let's read it back */ | |
3546 | set_bit(R5_Wantread, &dev->flags); | |
3547 | set_bit(R5_LOCKED, &dev->flags); | |
3548 | s.locked++; | |
3549 | } | |
3550 | } | |
3551 | } | |
3552 | ||
3553 | ||
3687c061 N |
3554 | /* Finish reconstruct operations initiated by the expansion process */ |
3555 | if (sh->reconstruct_state == reconstruct_state_result) { | |
3556 | struct stripe_head *sh_src | |
3557 | = get_active_stripe(conf, sh->sector, 1, 1, 1); | |
3558 | if (sh_src && test_bit(STRIPE_EXPAND_SOURCE, &sh_src->state)) { | |
3559 | /* sh cannot be written until sh_src has been read. | |
3560 | * so arrange for sh to be delayed a little | |
3561 | */ | |
3562 | set_bit(STRIPE_DELAYED, &sh->state); | |
3563 | set_bit(STRIPE_HANDLE, &sh->state); | |
3564 | if (!test_and_set_bit(STRIPE_PREREAD_ACTIVE, | |
3565 | &sh_src->state)) | |
3566 | atomic_inc(&conf->preread_active_stripes); | |
3567 | release_stripe(sh_src); | |
3568 | goto finish; | |
3569 | } | |
3570 | if (sh_src) | |
3571 | release_stripe(sh_src); | |
3572 | ||
3573 | sh->reconstruct_state = reconstruct_state_idle; | |
3574 | clear_bit(STRIPE_EXPANDING, &sh->state); | |
3575 | for (i = conf->raid_disks; i--; ) { | |
3576 | set_bit(R5_Wantwrite, &sh->dev[i].flags); | |
3577 | set_bit(R5_LOCKED, &sh->dev[i].flags); | |
3578 | s.locked++; | |
3579 | } | |
3580 | } | |
f416885e | 3581 | |
3687c061 N |
3582 | if (s.expanded && test_bit(STRIPE_EXPANDING, &sh->state) && |
3583 | !sh->reconstruct_state) { | |
3584 | /* Need to write out all blocks after computing parity */ | |
3585 | sh->disks = conf->raid_disks; | |
3586 | stripe_set_idx(sh->sector, conf, 0, sh); | |
3587 | schedule_reconstruction(sh, &s, 1, 1); | |
3588 | } else if (s.expanded && !sh->reconstruct_state && s.locked == 0) { | |
3589 | clear_bit(STRIPE_EXPAND_READY, &sh->state); | |
3590 | atomic_dec(&conf->reshape_stripes); | |
3591 | wake_up(&conf->wait_for_overlap); | |
3592 | md_done_sync(conf->mddev, STRIPE_SECTORS, 1); | |
3593 | } | |
3594 | ||
3595 | if (s.expanding && s.locked == 0 && | |
3596 | !test_bit(STRIPE_COMPUTE_RUN, &sh->state)) | |
3597 | handle_stripe_expansion(conf, sh); | |
16a53ecc | 3598 | |
3687c061 | 3599 | finish: |
6bfe0b49 | 3600 | /* wait for this device to become unblocked */ |
5f066c63 N |
3601 | if (unlikely(s.blocked_rdev)) { |
3602 | if (conf->mddev->external) | |
3603 | md_wait_for_blocked_rdev(s.blocked_rdev, | |
3604 | conf->mddev); | |
3605 | else | |
3606 | /* Internal metadata will immediately | |
3607 | * be written by raid5d, so we don't | |
3608 | * need to wait here. | |
3609 | */ | |
3610 | rdev_dec_pending(s.blocked_rdev, | |
3611 | conf->mddev); | |
3612 | } | |
6bfe0b49 | 3613 | |
bc2607f3 N |
3614 | if (s.handle_bad_blocks) |
3615 | for (i = disks; i--; ) { | |
3cb03002 | 3616 | struct md_rdev *rdev; |
bc2607f3 N |
3617 | struct r5dev *dev = &sh->dev[i]; |
3618 | if (test_and_clear_bit(R5_WriteError, &dev->flags)) { | |
3619 | /* We own a safe reference to the rdev */ | |
3620 | rdev = conf->disks[i].rdev; | |
3621 | if (!rdev_set_badblocks(rdev, sh->sector, | |
3622 | STRIPE_SECTORS, 0)) | |
3623 | md_error(conf->mddev, rdev); | |
3624 | rdev_dec_pending(rdev, conf->mddev); | |
3625 | } | |
b84db560 N |
3626 | if (test_and_clear_bit(R5_MadeGood, &dev->flags)) { |
3627 | rdev = conf->disks[i].rdev; | |
3628 | rdev_clear_badblocks(rdev, sh->sector, | |
c6563a8c | 3629 | STRIPE_SECTORS, 0); |
b84db560 N |
3630 | rdev_dec_pending(rdev, conf->mddev); |
3631 | } | |
977df362 N |
3632 | if (test_and_clear_bit(R5_MadeGoodRepl, &dev->flags)) { |
3633 | rdev = conf->disks[i].replacement; | |
dd054fce N |
3634 | if (!rdev) |
3635 | /* rdev have been moved down */ | |
3636 | rdev = conf->disks[i].rdev; | |
977df362 | 3637 | rdev_clear_badblocks(rdev, sh->sector, |
c6563a8c | 3638 | STRIPE_SECTORS, 0); |
977df362 N |
3639 | rdev_dec_pending(rdev, conf->mddev); |
3640 | } | |
bc2607f3 N |
3641 | } |
3642 | ||
6c0069c0 YT |
3643 | if (s.ops_request) |
3644 | raid_run_ops(sh, s.ops_request); | |
3645 | ||
f0e43bcd | 3646 | ops_run_io(sh, &s); |
16a53ecc | 3647 | |
c5709ef6 | 3648 | if (s.dec_preread_active) { |
729a1866 | 3649 | /* We delay this until after ops_run_io so that if make_request |
e9c7469b | 3650 | * is waiting on a flush, it won't continue until the writes |
729a1866 N |
3651 | * have actually been submitted. |
3652 | */ | |
3653 | atomic_dec(&conf->preread_active_stripes); | |
3654 | if (atomic_read(&conf->preread_active_stripes) < | |
3655 | IO_THRESHOLD) | |
3656 | md_wakeup_thread(conf->mddev->thread); | |
3657 | } | |
3658 | ||
c5709ef6 | 3659 | return_io(s.return_bi); |
16a53ecc | 3660 | |
257a4b42 | 3661 | clear_bit_unlock(STRIPE_ACTIVE, &sh->state); |
16a53ecc N |
3662 | } |
3663 | ||
d1688a6d | 3664 | static void raid5_activate_delayed(struct r5conf *conf) |
16a53ecc N |
3665 | { |
3666 | if (atomic_read(&conf->preread_active_stripes) < IO_THRESHOLD) { | |
3667 | while (!list_empty(&conf->delayed_list)) { | |
3668 | struct list_head *l = conf->delayed_list.next; | |
3669 | struct stripe_head *sh; | |
3670 | sh = list_entry(l, struct stripe_head, lru); | |
3671 | list_del_init(l); | |
3672 | clear_bit(STRIPE_DELAYED, &sh->state); | |
3673 | if (!test_and_set_bit(STRIPE_PREREAD_ACTIVE, &sh->state)) | |
3674 | atomic_inc(&conf->preread_active_stripes); | |
8b3e6cdc | 3675 | list_add_tail(&sh->lru, &conf->hold_list); |
16a53ecc | 3676 | } |
482c0834 | 3677 | } |
16a53ecc N |
3678 | } |
3679 | ||
d1688a6d | 3680 | static void activate_bit_delay(struct r5conf *conf) |
16a53ecc N |
3681 | { |
3682 | /* device_lock is held */ | |
3683 | struct list_head head; | |
3684 | list_add(&head, &conf->bitmap_list); | |
3685 | list_del_init(&conf->bitmap_list); | |
3686 | while (!list_empty(&head)) { | |
3687 | struct stripe_head *sh = list_entry(head.next, struct stripe_head, lru); | |
3688 | list_del_init(&sh->lru); | |
3689 | atomic_inc(&sh->count); | |
3690 | __release_stripe(conf, sh); | |
3691 | } | |
3692 | } | |
3693 | ||
fd01b88c | 3694 | int md_raid5_congested(struct mddev *mddev, int bits) |
f022b2fd | 3695 | { |
d1688a6d | 3696 | struct r5conf *conf = mddev->private; |
f022b2fd N |
3697 | |
3698 | /* No difference between reads and writes. Just check | |
3699 | * how busy the stripe_cache is | |
3700 | */ | |
3fa841d7 | 3701 | |
f022b2fd N |
3702 | if (conf->inactive_blocked) |
3703 | return 1; | |
3704 | if (conf->quiesce) | |
3705 | return 1; | |
3706 | if (list_empty_careful(&conf->inactive_list)) | |
3707 | return 1; | |
3708 | ||
3709 | return 0; | |
3710 | } | |
11d8a6e3 N |
3711 | EXPORT_SYMBOL_GPL(md_raid5_congested); |
3712 | ||
3713 | static int raid5_congested(void *data, int bits) | |
3714 | { | |
fd01b88c | 3715 | struct mddev *mddev = data; |
11d8a6e3 N |
3716 | |
3717 | return mddev_congested(mddev, bits) || | |
3718 | md_raid5_congested(mddev, bits); | |
3719 | } | |
f022b2fd | 3720 | |
23032a0e RBJ |
3721 | /* We want read requests to align with chunks where possible, |
3722 | * but write requests don't need to. | |
3723 | */ | |
cc371e66 AK |
3724 | static int raid5_mergeable_bvec(struct request_queue *q, |
3725 | struct bvec_merge_data *bvm, | |
3726 | struct bio_vec *biovec) | |
23032a0e | 3727 | { |
fd01b88c | 3728 | struct mddev *mddev = q->queuedata; |
cc371e66 | 3729 | sector_t sector = bvm->bi_sector + get_start_sect(bvm->bi_bdev); |
23032a0e | 3730 | int max; |
9d8f0363 | 3731 | unsigned int chunk_sectors = mddev->chunk_sectors; |
cc371e66 | 3732 | unsigned int bio_sectors = bvm->bi_size >> 9; |
23032a0e | 3733 | |
cc371e66 | 3734 | if ((bvm->bi_rw & 1) == WRITE) |
23032a0e RBJ |
3735 | return biovec->bv_len; /* always allow writes to be mergeable */ |
3736 | ||
664e7c41 AN |
3737 | if (mddev->new_chunk_sectors < mddev->chunk_sectors) |
3738 | chunk_sectors = mddev->new_chunk_sectors; | |
23032a0e RBJ |
3739 | max = (chunk_sectors - ((sector & (chunk_sectors - 1)) + bio_sectors)) << 9; |
3740 | if (max < 0) max = 0; | |
3741 | if (max <= biovec->bv_len && bio_sectors == 0) | |
3742 | return biovec->bv_len; | |
3743 | else | |
3744 | return max; | |
3745 | } | |
3746 | ||
f679623f | 3747 | |
fd01b88c | 3748 | static int in_chunk_boundary(struct mddev *mddev, struct bio *bio) |
f679623f RBJ |
3749 | { |
3750 | sector_t sector = bio->bi_sector + get_start_sect(bio->bi_bdev); | |
9d8f0363 | 3751 | unsigned int chunk_sectors = mddev->chunk_sectors; |
f679623f RBJ |
3752 | unsigned int bio_sectors = bio->bi_size >> 9; |
3753 | ||
664e7c41 AN |
3754 | if (mddev->new_chunk_sectors < mddev->chunk_sectors) |
3755 | chunk_sectors = mddev->new_chunk_sectors; | |
f679623f RBJ |
3756 | return chunk_sectors >= |
3757 | ((sector & (chunk_sectors - 1)) + bio_sectors); | |
3758 | } | |
3759 | ||
46031f9a RBJ |
3760 | /* |
3761 | * add bio to the retry LIFO ( in O(1) ... we are in interrupt ) | |
3762 | * later sampled by raid5d. | |
3763 | */ | |
d1688a6d | 3764 | static void add_bio_to_retry(struct bio *bi,struct r5conf *conf) |
46031f9a RBJ |
3765 | { |
3766 | unsigned long flags; | |
3767 | ||
3768 | spin_lock_irqsave(&conf->device_lock, flags); | |
3769 | ||
3770 | bi->bi_next = conf->retry_read_aligned_list; | |
3771 | conf->retry_read_aligned_list = bi; | |
3772 | ||
3773 | spin_unlock_irqrestore(&conf->device_lock, flags); | |
3774 | md_wakeup_thread(conf->mddev->thread); | |
3775 | } | |
3776 | ||
3777 | ||
d1688a6d | 3778 | static struct bio *remove_bio_from_retry(struct r5conf *conf) |
46031f9a RBJ |
3779 | { |
3780 | struct bio *bi; | |
3781 | ||
3782 | bi = conf->retry_read_aligned; | |
3783 | if (bi) { | |
3784 | conf->retry_read_aligned = NULL; | |
3785 | return bi; | |
3786 | } | |
3787 | bi = conf->retry_read_aligned_list; | |
3788 | if(bi) { | |
387bb173 | 3789 | conf->retry_read_aligned_list = bi->bi_next; |
46031f9a | 3790 | bi->bi_next = NULL; |
960e739d JA |
3791 | /* |
3792 | * this sets the active strip count to 1 and the processed | |
3793 | * strip count to zero (upper 8 bits) | |
3794 | */ | |
46031f9a | 3795 | bi->bi_phys_segments = 1; /* biased count of active stripes */ |
46031f9a RBJ |
3796 | } |
3797 | ||
3798 | return bi; | |
3799 | } | |
3800 | ||
3801 | ||
f679623f RBJ |
3802 | /* |
3803 | * The "raid5_align_endio" should check if the read succeeded and if it | |
3804 | * did, call bio_endio on the original bio (having bio_put the new bio | |
3805 | * first). | |
3806 | * If the read failed.. | |
3807 | */ | |
6712ecf8 | 3808 | static void raid5_align_endio(struct bio *bi, int error) |
f679623f RBJ |
3809 | { |
3810 | struct bio* raid_bi = bi->bi_private; | |
fd01b88c | 3811 | struct mddev *mddev; |
d1688a6d | 3812 | struct r5conf *conf; |
46031f9a | 3813 | int uptodate = test_bit(BIO_UPTODATE, &bi->bi_flags); |
3cb03002 | 3814 | struct md_rdev *rdev; |
46031f9a | 3815 | |
f679623f | 3816 | bio_put(bi); |
46031f9a | 3817 | |
46031f9a RBJ |
3818 | rdev = (void*)raid_bi->bi_next; |
3819 | raid_bi->bi_next = NULL; | |
2b7f2228 N |
3820 | mddev = rdev->mddev; |
3821 | conf = mddev->private; | |
46031f9a RBJ |
3822 | |
3823 | rdev_dec_pending(rdev, conf->mddev); | |
3824 | ||
3825 | if (!error && uptodate) { | |
6712ecf8 | 3826 | bio_endio(raid_bi, 0); |
46031f9a RBJ |
3827 | if (atomic_dec_and_test(&conf->active_aligned_reads)) |
3828 | wake_up(&conf->wait_for_stripe); | |
6712ecf8 | 3829 | return; |
46031f9a RBJ |
3830 | } |
3831 | ||
3832 | ||
45b4233c | 3833 | pr_debug("raid5_align_endio : io error...handing IO for a retry\n"); |
46031f9a RBJ |
3834 | |
3835 | add_bio_to_retry(raid_bi, conf); | |
f679623f RBJ |
3836 | } |
3837 | ||
387bb173 NB |
3838 | static int bio_fits_rdev(struct bio *bi) |
3839 | { | |
165125e1 | 3840 | struct request_queue *q = bdev_get_queue(bi->bi_bdev); |
387bb173 | 3841 | |
ae03bf63 | 3842 | if ((bi->bi_size>>9) > queue_max_sectors(q)) |
387bb173 NB |
3843 | return 0; |
3844 | blk_recount_segments(q, bi); | |
8a78362c | 3845 | if (bi->bi_phys_segments > queue_max_segments(q)) |
387bb173 NB |
3846 | return 0; |
3847 | ||
3848 | if (q->merge_bvec_fn) | |
3849 | /* it's too hard to apply the merge_bvec_fn at this stage, | |
3850 | * just just give up | |
3851 | */ | |
3852 | return 0; | |
3853 | ||
3854 | return 1; | |
3855 | } | |
3856 | ||
3857 | ||
fd01b88c | 3858 | static int chunk_aligned_read(struct mddev *mddev, struct bio * raid_bio) |
f679623f | 3859 | { |
d1688a6d | 3860 | struct r5conf *conf = mddev->private; |
8553fe7e | 3861 | int dd_idx; |
f679623f | 3862 | struct bio* align_bi; |
3cb03002 | 3863 | struct md_rdev *rdev; |
671488cc | 3864 | sector_t end_sector; |
f679623f RBJ |
3865 | |
3866 | if (!in_chunk_boundary(mddev, raid_bio)) { | |
45b4233c | 3867 | pr_debug("chunk_aligned_read : non aligned\n"); |
f679623f RBJ |
3868 | return 0; |
3869 | } | |
3870 | /* | |
a167f663 | 3871 | * use bio_clone_mddev to make a copy of the bio |
f679623f | 3872 | */ |
a167f663 | 3873 | align_bi = bio_clone_mddev(raid_bio, GFP_NOIO, mddev); |
f679623f RBJ |
3874 | if (!align_bi) |
3875 | return 0; | |
3876 | /* | |
3877 | * set bi_end_io to a new function, and set bi_private to the | |
3878 | * original bio. | |
3879 | */ | |
3880 | align_bi->bi_end_io = raid5_align_endio; | |
3881 | align_bi->bi_private = raid_bio; | |
3882 | /* | |
3883 | * compute position | |
3884 | */ | |
112bf897 N |
3885 | align_bi->bi_sector = raid5_compute_sector(conf, raid_bio->bi_sector, |
3886 | 0, | |
911d4ee8 | 3887 | &dd_idx, NULL); |
f679623f | 3888 | |
671488cc | 3889 | end_sector = align_bi->bi_sector + (align_bi->bi_size >> 9); |
f679623f | 3890 | rcu_read_lock(); |
671488cc N |
3891 | rdev = rcu_dereference(conf->disks[dd_idx].replacement); |
3892 | if (!rdev || test_bit(Faulty, &rdev->flags) || | |
3893 | rdev->recovery_offset < end_sector) { | |
3894 | rdev = rcu_dereference(conf->disks[dd_idx].rdev); | |
3895 | if (rdev && | |
3896 | (test_bit(Faulty, &rdev->flags) || | |
3897 | !(test_bit(In_sync, &rdev->flags) || | |
3898 | rdev->recovery_offset >= end_sector))) | |
3899 | rdev = NULL; | |
3900 | } | |
3901 | if (rdev) { | |
31c176ec N |
3902 | sector_t first_bad; |
3903 | int bad_sectors; | |
3904 | ||
f679623f RBJ |
3905 | atomic_inc(&rdev->nr_pending); |
3906 | rcu_read_unlock(); | |
46031f9a RBJ |
3907 | raid_bio->bi_next = (void*)rdev; |
3908 | align_bi->bi_bdev = rdev->bdev; | |
3909 | align_bi->bi_flags &= ~(1 << BIO_SEG_VALID); | |
46031f9a | 3910 | |
31c176ec N |
3911 | if (!bio_fits_rdev(align_bi) || |
3912 | is_badblock(rdev, align_bi->bi_sector, align_bi->bi_size>>9, | |
3913 | &first_bad, &bad_sectors)) { | |
3914 | /* too big in some way, or has a known bad block */ | |
387bb173 NB |
3915 | bio_put(align_bi); |
3916 | rdev_dec_pending(rdev, mddev); | |
3917 | return 0; | |
3918 | } | |
3919 | ||
6c0544e2 | 3920 | /* No reshape active, so we can trust rdev->data_offset */ |
3921 | align_bi->bi_sector += rdev->data_offset; | |
3922 | ||
46031f9a RBJ |
3923 | spin_lock_irq(&conf->device_lock); |
3924 | wait_event_lock_irq(conf->wait_for_stripe, | |
3925 | conf->quiesce == 0, | |
3926 | conf->device_lock, /* nothing */); | |
3927 | atomic_inc(&conf->active_aligned_reads); | |
3928 | spin_unlock_irq(&conf->device_lock); | |
3929 | ||
f679623f RBJ |
3930 | generic_make_request(align_bi); |
3931 | return 1; | |
3932 | } else { | |
3933 | rcu_read_unlock(); | |
46031f9a | 3934 | bio_put(align_bi); |
f679623f RBJ |
3935 | return 0; |
3936 | } | |
3937 | } | |
3938 | ||
8b3e6cdc DW |
3939 | /* __get_priority_stripe - get the next stripe to process |
3940 | * | |
3941 | * Full stripe writes are allowed to pass preread active stripes up until | |
3942 | * the bypass_threshold is exceeded. In general the bypass_count | |
3943 | * increments when the handle_list is handled before the hold_list; however, it | |
3944 | * will not be incremented when STRIPE_IO_STARTED is sampled set signifying a | |
3945 | * stripe with in flight i/o. The bypass_count will be reset when the | |
3946 | * head of the hold_list has changed, i.e. the head was promoted to the | |
3947 | * handle_list. | |
3948 | */ | |
d1688a6d | 3949 | static struct stripe_head *__get_priority_stripe(struct r5conf *conf) |
8b3e6cdc DW |
3950 | { |
3951 | struct stripe_head *sh; | |
3952 | ||
3953 | pr_debug("%s: handle: %s hold: %s full_writes: %d bypass_count: %d\n", | |
3954 | __func__, | |
3955 | list_empty(&conf->handle_list) ? "empty" : "busy", | |
3956 | list_empty(&conf->hold_list) ? "empty" : "busy", | |
3957 | atomic_read(&conf->pending_full_writes), conf->bypass_count); | |
3958 | ||
3959 | if (!list_empty(&conf->handle_list)) { | |
3960 | sh = list_entry(conf->handle_list.next, typeof(*sh), lru); | |
3961 | ||
3962 | if (list_empty(&conf->hold_list)) | |
3963 | conf->bypass_count = 0; | |
3964 | else if (!test_bit(STRIPE_IO_STARTED, &sh->state)) { | |
3965 | if (conf->hold_list.next == conf->last_hold) | |
3966 | conf->bypass_count++; | |
3967 | else { | |
3968 | conf->last_hold = conf->hold_list.next; | |
3969 | conf->bypass_count -= conf->bypass_threshold; | |
3970 | if (conf->bypass_count < 0) | |
3971 | conf->bypass_count = 0; | |
3972 | } | |
3973 | } | |
3974 | } else if (!list_empty(&conf->hold_list) && | |
3975 | ((conf->bypass_threshold && | |
3976 | conf->bypass_count > conf->bypass_threshold) || | |
3977 | atomic_read(&conf->pending_full_writes) == 0)) { | |
3978 | sh = list_entry(conf->hold_list.next, | |
3979 | typeof(*sh), lru); | |
3980 | conf->bypass_count -= conf->bypass_threshold; | |
3981 | if (conf->bypass_count < 0) | |
3982 | conf->bypass_count = 0; | |
3983 | } else | |
3984 | return NULL; | |
3985 | ||
3986 | list_del_init(&sh->lru); | |
3987 | atomic_inc(&sh->count); | |
3988 | BUG_ON(atomic_read(&sh->count) != 1); | |
3989 | return sh; | |
3990 | } | |
f679623f | 3991 | |
8811b596 SL |
3992 | struct raid5_plug_cb { |
3993 | struct blk_plug_cb cb; | |
3994 | struct list_head list; | |
3995 | }; | |
3996 | ||
3997 | static void raid5_unplug(struct blk_plug_cb *blk_cb, bool from_schedule) | |
3998 | { | |
3999 | struct raid5_plug_cb *cb = container_of( | |
4000 | blk_cb, struct raid5_plug_cb, cb); | |
4001 | struct stripe_head *sh; | |
4002 | struct mddev *mddev = cb->cb.data; | |
4003 | struct r5conf *conf = mddev->private; | |
4004 | ||
4005 | if (cb->list.next && !list_empty(&cb->list)) { | |
4006 | spin_lock_irq(&conf->device_lock); | |
4007 | while (!list_empty(&cb->list)) { | |
4008 | sh = list_first_entry(&cb->list, struct stripe_head, lru); | |
4009 | list_del_init(&sh->lru); | |
4010 | /* | |
4011 | * avoid race release_stripe_plug() sees | |
4012 | * STRIPE_ON_UNPLUG_LIST clear but the stripe | |
4013 | * is still in our list | |
4014 | */ | |
4015 | smp_mb__before_clear_bit(); | |
4016 | clear_bit(STRIPE_ON_UNPLUG_LIST, &sh->state); | |
4017 | __release_stripe(conf, sh); | |
4018 | } | |
4019 | spin_unlock_irq(&conf->device_lock); | |
4020 | } | |
4021 | kfree(cb); | |
4022 | } | |
4023 | ||
4024 | static void release_stripe_plug(struct mddev *mddev, | |
4025 | struct stripe_head *sh) | |
4026 | { | |
4027 | struct blk_plug_cb *blk_cb = blk_check_plugged( | |
4028 | raid5_unplug, mddev, | |
4029 | sizeof(struct raid5_plug_cb)); | |
4030 | struct raid5_plug_cb *cb; | |
4031 | ||
4032 | if (!blk_cb) { | |
4033 | release_stripe(sh); | |
4034 | return; | |
4035 | } | |
4036 | ||
4037 | cb = container_of(blk_cb, struct raid5_plug_cb, cb); | |
4038 | ||
4039 | if (cb->list.next == NULL) | |
4040 | INIT_LIST_HEAD(&cb->list); | |
4041 | ||
4042 | if (!test_and_set_bit(STRIPE_ON_UNPLUG_LIST, &sh->state)) | |
4043 | list_add_tail(&sh->lru, &cb->list); | |
4044 | else | |
4045 | release_stripe(sh); | |
4046 | } | |
4047 | ||
b4fdcb02 | 4048 | static void make_request(struct mddev *mddev, struct bio * bi) |
1da177e4 | 4049 | { |
d1688a6d | 4050 | struct r5conf *conf = mddev->private; |
911d4ee8 | 4051 | int dd_idx; |
1da177e4 LT |
4052 | sector_t new_sector; |
4053 | sector_t logical_sector, last_sector; | |
4054 | struct stripe_head *sh; | |
a362357b | 4055 | const int rw = bio_data_dir(bi); |
49077326 | 4056 | int remaining; |
1da177e4 | 4057 | |
e9c7469b TH |
4058 | if (unlikely(bi->bi_rw & REQ_FLUSH)) { |
4059 | md_flush_request(mddev, bi); | |
5a7bbad2 | 4060 | return; |
e5dcdd80 N |
4061 | } |
4062 | ||
3d310eb7 | 4063 | md_write_start(mddev, bi); |
06d91a5f | 4064 | |
802ba064 | 4065 | if (rw == READ && |
52488615 | 4066 | mddev->reshape_position == MaxSector && |
21a52c6d | 4067 | chunk_aligned_read(mddev,bi)) |
5a7bbad2 | 4068 | return; |
52488615 | 4069 | |
1da177e4 LT |
4070 | logical_sector = bi->bi_sector & ~((sector_t)STRIPE_SECTORS-1); |
4071 | last_sector = bi->bi_sector + (bi->bi_size>>9); | |
4072 | bi->bi_next = NULL; | |
4073 | bi->bi_phys_segments = 1; /* over-loaded to count active stripes */ | |
06d91a5f | 4074 | |
1da177e4 LT |
4075 | for (;logical_sector < last_sector; logical_sector += STRIPE_SECTORS) { |
4076 | DEFINE_WAIT(w); | |
b5663ba4 | 4077 | int previous; |
b578d55f | 4078 | |
7ecaa1e6 | 4079 | retry: |
b5663ba4 | 4080 | previous = 0; |
b578d55f | 4081 | prepare_to_wait(&conf->wait_for_overlap, &w, TASK_UNINTERRUPTIBLE); |
b0f9ec04 | 4082 | if (unlikely(conf->reshape_progress != MaxSector)) { |
fef9c61f | 4083 | /* spinlock is needed as reshape_progress may be |
df8e7f76 N |
4084 | * 64bit on a 32bit platform, and so it might be |
4085 | * possible to see a half-updated value | |
aeb878b0 | 4086 | * Of course reshape_progress could change after |
df8e7f76 N |
4087 | * the lock is dropped, so once we get a reference |
4088 | * to the stripe that we think it is, we will have | |
4089 | * to check again. | |
4090 | */ | |
7ecaa1e6 | 4091 | spin_lock_irq(&conf->device_lock); |
2c810cdd | 4092 | if (mddev->reshape_backwards |
fef9c61f N |
4093 | ? logical_sector < conf->reshape_progress |
4094 | : logical_sector >= conf->reshape_progress) { | |
b5663ba4 N |
4095 | previous = 1; |
4096 | } else { | |
2c810cdd | 4097 | if (mddev->reshape_backwards |
fef9c61f N |
4098 | ? logical_sector < conf->reshape_safe |
4099 | : logical_sector >= conf->reshape_safe) { | |
b578d55f N |
4100 | spin_unlock_irq(&conf->device_lock); |
4101 | schedule(); | |
4102 | goto retry; | |
4103 | } | |
4104 | } | |
7ecaa1e6 N |
4105 | spin_unlock_irq(&conf->device_lock); |
4106 | } | |
16a53ecc | 4107 | |
112bf897 N |
4108 | new_sector = raid5_compute_sector(conf, logical_sector, |
4109 | previous, | |
911d4ee8 | 4110 | &dd_idx, NULL); |
0c55e022 | 4111 | pr_debug("raid456: make_request, sector %llu logical %llu\n", |
1da177e4 LT |
4112 | (unsigned long long)new_sector, |
4113 | (unsigned long long)logical_sector); | |
4114 | ||
b5663ba4 | 4115 | sh = get_active_stripe(conf, new_sector, previous, |
a8c906ca | 4116 | (bi->bi_rw&RWA_MASK), 0); |
1da177e4 | 4117 | if (sh) { |
b0f9ec04 | 4118 | if (unlikely(previous)) { |
7ecaa1e6 | 4119 | /* expansion might have moved on while waiting for a |
df8e7f76 N |
4120 | * stripe, so we must do the range check again. |
4121 | * Expansion could still move past after this | |
4122 | * test, but as we are holding a reference to | |
4123 | * 'sh', we know that if that happens, | |
4124 | * STRIPE_EXPANDING will get set and the expansion | |
4125 | * won't proceed until we finish with the stripe. | |
7ecaa1e6 N |
4126 | */ |
4127 | int must_retry = 0; | |
4128 | spin_lock_irq(&conf->device_lock); | |
2c810cdd | 4129 | if (mddev->reshape_backwards |
b0f9ec04 N |
4130 | ? logical_sector >= conf->reshape_progress |
4131 | : logical_sector < conf->reshape_progress) | |
7ecaa1e6 N |
4132 | /* mismatch, need to try again */ |
4133 | must_retry = 1; | |
4134 | spin_unlock_irq(&conf->device_lock); | |
4135 | if (must_retry) { | |
4136 | release_stripe(sh); | |
7a3ab908 | 4137 | schedule(); |
7ecaa1e6 N |
4138 | goto retry; |
4139 | } | |
4140 | } | |
e62e58a5 | 4141 | |
ffd96e35 | 4142 | if (rw == WRITE && |
a5c308d4 | 4143 | logical_sector >= mddev->suspend_lo && |
e464eafd N |
4144 | logical_sector < mddev->suspend_hi) { |
4145 | release_stripe(sh); | |
e62e58a5 N |
4146 | /* As the suspend_* range is controlled by |
4147 | * userspace, we want an interruptible | |
4148 | * wait. | |
4149 | */ | |
4150 | flush_signals(current); | |
4151 | prepare_to_wait(&conf->wait_for_overlap, | |
4152 | &w, TASK_INTERRUPTIBLE); | |
4153 | if (logical_sector >= mddev->suspend_lo && | |
4154 | logical_sector < mddev->suspend_hi) | |
4155 | schedule(); | |
e464eafd N |
4156 | goto retry; |
4157 | } | |
7ecaa1e6 N |
4158 | |
4159 | if (test_bit(STRIPE_EXPANDING, &sh->state) || | |
ffd96e35 | 4160 | !add_stripe_bio(sh, bi, dd_idx, rw)) { |
7ecaa1e6 N |
4161 | /* Stripe is busy expanding or |
4162 | * add failed due to overlap. Flush everything | |
1da177e4 LT |
4163 | * and wait a while |
4164 | */ | |
482c0834 | 4165 | md_wakeup_thread(mddev->thread); |
1da177e4 LT |
4166 | release_stripe(sh); |
4167 | schedule(); | |
4168 | goto retry; | |
4169 | } | |
4170 | finish_wait(&conf->wait_for_overlap, &w); | |
6ed3003c N |
4171 | set_bit(STRIPE_HANDLE, &sh->state); |
4172 | clear_bit(STRIPE_DELAYED, &sh->state); | |
e9c7469b | 4173 | if ((bi->bi_rw & REQ_SYNC) && |
729a1866 N |
4174 | !test_and_set_bit(STRIPE_PREREAD_ACTIVE, &sh->state)) |
4175 | atomic_inc(&conf->preread_active_stripes); | |
8811b596 | 4176 | release_stripe_plug(mddev, sh); |
1da177e4 LT |
4177 | } else { |
4178 | /* cannot get stripe for read-ahead, just give-up */ | |
4179 | clear_bit(BIO_UPTODATE, &bi->bi_flags); | |
4180 | finish_wait(&conf->wait_for_overlap, &w); | |
4181 | break; | |
4182 | } | |
1da177e4 | 4183 | } |
7c13edc8 | 4184 | |
1da177e4 | 4185 | spin_lock_irq(&conf->device_lock); |
960e739d | 4186 | remaining = raid5_dec_bi_phys_segments(bi); |
f6344757 N |
4187 | spin_unlock_irq(&conf->device_lock); |
4188 | if (remaining == 0) { | |
1da177e4 | 4189 | |
16a53ecc | 4190 | if ( rw == WRITE ) |
1da177e4 | 4191 | md_write_end(mddev); |
6712ecf8 | 4192 | |
0e13fe23 | 4193 | bio_endio(bi, 0); |
1da177e4 | 4194 | } |
1da177e4 LT |
4195 | } |
4196 | ||
fd01b88c | 4197 | static sector_t raid5_size(struct mddev *mddev, sector_t sectors, int raid_disks); |
b522adcd | 4198 | |
fd01b88c | 4199 | static sector_t reshape_request(struct mddev *mddev, sector_t sector_nr, int *skipped) |
1da177e4 | 4200 | { |
52c03291 N |
4201 | /* reshaping is quite different to recovery/resync so it is |
4202 | * handled quite separately ... here. | |
4203 | * | |
4204 | * On each call to sync_request, we gather one chunk worth of | |
4205 | * destination stripes and flag them as expanding. | |
4206 | * Then we find all the source stripes and request reads. | |
4207 | * As the reads complete, handle_stripe will copy the data | |
4208 | * into the destination stripe and release that stripe. | |
4209 | */ | |
d1688a6d | 4210 | struct r5conf *conf = mddev->private; |
1da177e4 | 4211 | struct stripe_head *sh; |
ccfcc3c1 | 4212 | sector_t first_sector, last_sector; |
f416885e N |
4213 | int raid_disks = conf->previous_raid_disks; |
4214 | int data_disks = raid_disks - conf->max_degraded; | |
4215 | int new_data_disks = conf->raid_disks - conf->max_degraded; | |
52c03291 N |
4216 | int i; |
4217 | int dd_idx; | |
c8f517c4 | 4218 | sector_t writepos, readpos, safepos; |
ec32a2bd | 4219 | sector_t stripe_addr; |
7a661381 | 4220 | int reshape_sectors; |
ab69ae12 | 4221 | struct list_head stripes; |
52c03291 | 4222 | |
fef9c61f N |
4223 | if (sector_nr == 0) { |
4224 | /* If restarting in the middle, skip the initial sectors */ | |
2c810cdd | 4225 | if (mddev->reshape_backwards && |
fef9c61f N |
4226 | conf->reshape_progress < raid5_size(mddev, 0, 0)) { |
4227 | sector_nr = raid5_size(mddev, 0, 0) | |
4228 | - conf->reshape_progress; | |
2c810cdd | 4229 | } else if (!mddev->reshape_backwards && |
fef9c61f N |
4230 | conf->reshape_progress > 0) |
4231 | sector_nr = conf->reshape_progress; | |
f416885e | 4232 | sector_div(sector_nr, new_data_disks); |
fef9c61f | 4233 | if (sector_nr) { |
8dee7211 N |
4234 | mddev->curr_resync_completed = sector_nr; |
4235 | sysfs_notify(&mddev->kobj, NULL, "sync_completed"); | |
fef9c61f N |
4236 | *skipped = 1; |
4237 | return sector_nr; | |
4238 | } | |
52c03291 N |
4239 | } |
4240 | ||
7a661381 N |
4241 | /* We need to process a full chunk at a time. |
4242 | * If old and new chunk sizes differ, we need to process the | |
4243 | * largest of these | |
4244 | */ | |
664e7c41 AN |
4245 | if (mddev->new_chunk_sectors > mddev->chunk_sectors) |
4246 | reshape_sectors = mddev->new_chunk_sectors; | |
7a661381 | 4247 | else |
9d8f0363 | 4248 | reshape_sectors = mddev->chunk_sectors; |
7a661381 | 4249 | |
b5254dd5 N |
4250 | /* We update the metadata at least every 10 seconds, or when |
4251 | * the data about to be copied would over-write the source of | |
4252 | * the data at the front of the range. i.e. one new_stripe | |
4253 | * along from reshape_progress new_maps to after where | |
4254 | * reshape_safe old_maps to | |
52c03291 | 4255 | */ |
fef9c61f | 4256 | writepos = conf->reshape_progress; |
f416885e | 4257 | sector_div(writepos, new_data_disks); |
c8f517c4 N |
4258 | readpos = conf->reshape_progress; |
4259 | sector_div(readpos, data_disks); | |
fef9c61f | 4260 | safepos = conf->reshape_safe; |
f416885e | 4261 | sector_div(safepos, data_disks); |
2c810cdd | 4262 | if (mddev->reshape_backwards) { |
ed37d83e | 4263 | writepos -= min_t(sector_t, reshape_sectors, writepos); |
c8f517c4 | 4264 | readpos += reshape_sectors; |
7a661381 | 4265 | safepos += reshape_sectors; |
fef9c61f | 4266 | } else { |
7a661381 | 4267 | writepos += reshape_sectors; |
ed37d83e N |
4268 | readpos -= min_t(sector_t, reshape_sectors, readpos); |
4269 | safepos -= min_t(sector_t, reshape_sectors, safepos); | |
fef9c61f | 4270 | } |
52c03291 | 4271 | |
b5254dd5 N |
4272 | /* Having calculated the 'writepos' possibly use it |
4273 | * to set 'stripe_addr' which is where we will write to. | |
4274 | */ | |
4275 | if (mddev->reshape_backwards) { | |
4276 | BUG_ON(conf->reshape_progress == 0); | |
4277 | stripe_addr = writepos; | |
4278 | BUG_ON((mddev->dev_sectors & | |
4279 | ~((sector_t)reshape_sectors - 1)) | |
4280 | - reshape_sectors - stripe_addr | |
4281 | != sector_nr); | |
4282 | } else { | |
4283 | BUG_ON(writepos != sector_nr + reshape_sectors); | |
4284 | stripe_addr = sector_nr; | |
4285 | } | |
4286 | ||
c8f517c4 N |
4287 | /* 'writepos' is the most advanced device address we might write. |
4288 | * 'readpos' is the least advanced device address we might read. | |
4289 | * 'safepos' is the least address recorded in the metadata as having | |
4290 | * been reshaped. | |
b5254dd5 N |
4291 | * If there is a min_offset_diff, these are adjusted either by |
4292 | * increasing the safepos/readpos if diff is negative, or | |
4293 | * increasing writepos if diff is positive. | |
4294 | * If 'readpos' is then behind 'writepos', there is no way that we can | |
c8f517c4 N |
4295 | * ensure safety in the face of a crash - that must be done by userspace |
4296 | * making a backup of the data. So in that case there is no particular | |
4297 | * rush to update metadata. | |
4298 | * Otherwise if 'safepos' is behind 'writepos', then we really need to | |
4299 | * update the metadata to advance 'safepos' to match 'readpos' so that | |
4300 | * we can be safe in the event of a crash. | |
4301 | * So we insist on updating metadata if safepos is behind writepos and | |
4302 | * readpos is beyond writepos. | |
4303 | * In any case, update the metadata every 10 seconds. | |
4304 | * Maybe that number should be configurable, but I'm not sure it is | |
4305 | * worth it.... maybe it could be a multiple of safemode_delay??? | |
4306 | */ | |
b5254dd5 N |
4307 | if (conf->min_offset_diff < 0) { |
4308 | safepos += -conf->min_offset_diff; | |
4309 | readpos += -conf->min_offset_diff; | |
4310 | } else | |
4311 | writepos += conf->min_offset_diff; | |
4312 | ||
2c810cdd | 4313 | if ((mddev->reshape_backwards |
c8f517c4 N |
4314 | ? (safepos > writepos && readpos < writepos) |
4315 | : (safepos < writepos && readpos > writepos)) || | |
4316 | time_after(jiffies, conf->reshape_checkpoint + 10*HZ)) { | |
52c03291 N |
4317 | /* Cannot proceed until we've updated the superblock... */ |
4318 | wait_event(conf->wait_for_overlap, | |
4319 | atomic_read(&conf->reshape_stripes)==0); | |
fef9c61f | 4320 | mddev->reshape_position = conf->reshape_progress; |
75d3da43 | 4321 | mddev->curr_resync_completed = sector_nr; |
c8f517c4 | 4322 | conf->reshape_checkpoint = jiffies; |
850b2b42 | 4323 | set_bit(MD_CHANGE_DEVS, &mddev->flags); |
52c03291 | 4324 | md_wakeup_thread(mddev->thread); |
850b2b42 | 4325 | wait_event(mddev->sb_wait, mddev->flags == 0 || |
52c03291 N |
4326 | kthread_should_stop()); |
4327 | spin_lock_irq(&conf->device_lock); | |
fef9c61f | 4328 | conf->reshape_safe = mddev->reshape_position; |
52c03291 N |
4329 | spin_unlock_irq(&conf->device_lock); |
4330 | wake_up(&conf->wait_for_overlap); | |
acb180b0 | 4331 | sysfs_notify(&mddev->kobj, NULL, "sync_completed"); |
52c03291 N |
4332 | } |
4333 | ||
ab69ae12 | 4334 | INIT_LIST_HEAD(&stripes); |
7a661381 | 4335 | for (i = 0; i < reshape_sectors; i += STRIPE_SECTORS) { |
52c03291 | 4336 | int j; |
a9f326eb | 4337 | int skipped_disk = 0; |
a8c906ca | 4338 | sh = get_active_stripe(conf, stripe_addr+i, 0, 0, 1); |
52c03291 N |
4339 | set_bit(STRIPE_EXPANDING, &sh->state); |
4340 | atomic_inc(&conf->reshape_stripes); | |
4341 | /* If any of this stripe is beyond the end of the old | |
4342 | * array, then we need to zero those blocks | |
4343 | */ | |
4344 | for (j=sh->disks; j--;) { | |
4345 | sector_t s; | |
4346 | if (j == sh->pd_idx) | |
4347 | continue; | |
f416885e | 4348 | if (conf->level == 6 && |
d0dabf7e | 4349 | j == sh->qd_idx) |
f416885e | 4350 | continue; |
784052ec | 4351 | s = compute_blocknr(sh, j, 0); |
b522adcd | 4352 | if (s < raid5_size(mddev, 0, 0)) { |
a9f326eb | 4353 | skipped_disk = 1; |
52c03291 N |
4354 | continue; |
4355 | } | |
4356 | memset(page_address(sh->dev[j].page), 0, STRIPE_SIZE); | |
4357 | set_bit(R5_Expanded, &sh->dev[j].flags); | |
4358 | set_bit(R5_UPTODATE, &sh->dev[j].flags); | |
4359 | } | |
a9f326eb | 4360 | if (!skipped_disk) { |
52c03291 N |
4361 | set_bit(STRIPE_EXPAND_READY, &sh->state); |
4362 | set_bit(STRIPE_HANDLE, &sh->state); | |
4363 | } | |
ab69ae12 | 4364 | list_add(&sh->lru, &stripes); |
52c03291 N |
4365 | } |
4366 | spin_lock_irq(&conf->device_lock); | |
2c810cdd | 4367 | if (mddev->reshape_backwards) |
7a661381 | 4368 | conf->reshape_progress -= reshape_sectors * new_data_disks; |
fef9c61f | 4369 | else |
7a661381 | 4370 | conf->reshape_progress += reshape_sectors * new_data_disks; |
52c03291 N |
4371 | spin_unlock_irq(&conf->device_lock); |
4372 | /* Ok, those stripe are ready. We can start scheduling | |
4373 | * reads on the source stripes. | |
4374 | * The source stripes are determined by mapping the first and last | |
4375 | * block on the destination stripes. | |
4376 | */ | |
52c03291 | 4377 | first_sector = |
ec32a2bd | 4378 | raid5_compute_sector(conf, stripe_addr*(new_data_disks), |
911d4ee8 | 4379 | 1, &dd_idx, NULL); |
52c03291 | 4380 | last_sector = |
0e6e0271 | 4381 | raid5_compute_sector(conf, ((stripe_addr+reshape_sectors) |
09c9e5fa | 4382 | * new_data_disks - 1), |
911d4ee8 | 4383 | 1, &dd_idx, NULL); |
58c0fed4 AN |
4384 | if (last_sector >= mddev->dev_sectors) |
4385 | last_sector = mddev->dev_sectors - 1; | |
52c03291 | 4386 | while (first_sector <= last_sector) { |
a8c906ca | 4387 | sh = get_active_stripe(conf, first_sector, 1, 0, 1); |
52c03291 N |
4388 | set_bit(STRIPE_EXPAND_SOURCE, &sh->state); |
4389 | set_bit(STRIPE_HANDLE, &sh->state); | |
4390 | release_stripe(sh); | |
4391 | first_sector += STRIPE_SECTORS; | |
4392 | } | |
ab69ae12 N |
4393 | /* Now that the sources are clearly marked, we can release |
4394 | * the destination stripes | |
4395 | */ | |
4396 | while (!list_empty(&stripes)) { | |
4397 | sh = list_entry(stripes.next, struct stripe_head, lru); | |
4398 | list_del_init(&sh->lru); | |
4399 | release_stripe(sh); | |
4400 | } | |
c6207277 N |
4401 | /* If this takes us to the resync_max point where we have to pause, |
4402 | * then we need to write out the superblock. | |
4403 | */ | |
7a661381 | 4404 | sector_nr += reshape_sectors; |
c03f6a19 N |
4405 | if ((sector_nr - mddev->curr_resync_completed) * 2 |
4406 | >= mddev->resync_max - mddev->curr_resync_completed) { | |
c6207277 N |
4407 | /* Cannot proceed until we've updated the superblock... */ |
4408 | wait_event(conf->wait_for_overlap, | |
4409 | atomic_read(&conf->reshape_stripes) == 0); | |
fef9c61f | 4410 | mddev->reshape_position = conf->reshape_progress; |
75d3da43 | 4411 | mddev->curr_resync_completed = sector_nr; |
c8f517c4 | 4412 | conf->reshape_checkpoint = jiffies; |
c6207277 N |
4413 | set_bit(MD_CHANGE_DEVS, &mddev->flags); |
4414 | md_wakeup_thread(mddev->thread); | |
4415 | wait_event(mddev->sb_wait, | |
4416 | !test_bit(MD_CHANGE_DEVS, &mddev->flags) | |
4417 | || kthread_should_stop()); | |
4418 | spin_lock_irq(&conf->device_lock); | |
fef9c61f | 4419 | conf->reshape_safe = mddev->reshape_position; |
c6207277 N |
4420 | spin_unlock_irq(&conf->device_lock); |
4421 | wake_up(&conf->wait_for_overlap); | |
acb180b0 | 4422 | sysfs_notify(&mddev->kobj, NULL, "sync_completed"); |
c6207277 | 4423 | } |
7a661381 | 4424 | return reshape_sectors; |
52c03291 N |
4425 | } |
4426 | ||
4427 | /* FIXME go_faster isn't used */ | |
fd01b88c | 4428 | static inline sector_t sync_request(struct mddev *mddev, sector_t sector_nr, int *skipped, int go_faster) |
52c03291 | 4429 | { |
d1688a6d | 4430 | struct r5conf *conf = mddev->private; |
52c03291 | 4431 | struct stripe_head *sh; |
58c0fed4 | 4432 | sector_t max_sector = mddev->dev_sectors; |
57dab0bd | 4433 | sector_t sync_blocks; |
16a53ecc N |
4434 | int still_degraded = 0; |
4435 | int i; | |
1da177e4 | 4436 | |
72626685 | 4437 | if (sector_nr >= max_sector) { |
1da177e4 | 4438 | /* just being told to finish up .. nothing much to do */ |
cea9c228 | 4439 | |
29269553 N |
4440 | if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)) { |
4441 | end_reshape(conf); | |
4442 | return 0; | |
4443 | } | |
72626685 N |
4444 | |
4445 | if (mddev->curr_resync < max_sector) /* aborted */ | |
4446 | bitmap_end_sync(mddev->bitmap, mddev->curr_resync, | |
4447 | &sync_blocks, 1); | |
16a53ecc | 4448 | else /* completed sync */ |
72626685 N |
4449 | conf->fullsync = 0; |
4450 | bitmap_close_sync(mddev->bitmap); | |
4451 | ||
1da177e4 LT |
4452 | return 0; |
4453 | } | |
ccfcc3c1 | 4454 | |
64bd660b N |
4455 | /* Allow raid5_quiesce to complete */ |
4456 | wait_event(conf->wait_for_overlap, conf->quiesce != 2); | |
4457 | ||
52c03291 N |
4458 | if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)) |
4459 | return reshape_request(mddev, sector_nr, skipped); | |
f6705578 | 4460 | |
c6207277 N |
4461 | /* No need to check resync_max as we never do more than one |
4462 | * stripe, and as resync_max will always be on a chunk boundary, | |
4463 | * if the check in md_do_sync didn't fire, there is no chance | |
4464 | * of overstepping resync_max here | |
4465 | */ | |
4466 | ||
16a53ecc | 4467 | /* if there is too many failed drives and we are trying |
1da177e4 LT |
4468 | * to resync, then assert that we are finished, because there is |
4469 | * nothing we can do. | |
4470 | */ | |
3285edf1 | 4471 | if (mddev->degraded >= conf->max_degraded && |
16a53ecc | 4472 | test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) { |
58c0fed4 | 4473 | sector_t rv = mddev->dev_sectors - sector_nr; |
57afd89f | 4474 | *skipped = 1; |
1da177e4 LT |
4475 | return rv; |
4476 | } | |
72626685 | 4477 | if (!bitmap_start_sync(mddev->bitmap, sector_nr, &sync_blocks, 1) && |
3855ad9f | 4478 | !test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery) && |
72626685 N |
4479 | !conf->fullsync && sync_blocks >= STRIPE_SECTORS) { |
4480 | /* we can skip this block, and probably more */ | |
4481 | sync_blocks /= STRIPE_SECTORS; | |
4482 | *skipped = 1; | |
4483 | return sync_blocks * STRIPE_SECTORS; /* keep things rounded to whole stripes */ | |
4484 | } | |
1da177e4 | 4485 | |
b47490c9 N |
4486 | bitmap_cond_end_sync(mddev->bitmap, sector_nr); |
4487 | ||
a8c906ca | 4488 | sh = get_active_stripe(conf, sector_nr, 0, 1, 0); |
1da177e4 | 4489 | if (sh == NULL) { |
a8c906ca | 4490 | sh = get_active_stripe(conf, sector_nr, 0, 0, 0); |
1da177e4 | 4491 | /* make sure we don't swamp the stripe cache if someone else |
16a53ecc | 4492 | * is trying to get access |
1da177e4 | 4493 | */ |
66c006a5 | 4494 | schedule_timeout_uninterruptible(1); |
1da177e4 | 4495 | } |
16a53ecc N |
4496 | /* Need to check if array will still be degraded after recovery/resync |
4497 | * We don't need to check the 'failed' flag as when that gets set, | |
4498 | * recovery aborts. | |
4499 | */ | |
f001a70c | 4500 | for (i = 0; i < conf->raid_disks; i++) |
16a53ecc N |
4501 | if (conf->disks[i].rdev == NULL) |
4502 | still_degraded = 1; | |
4503 | ||
4504 | bitmap_start_sync(mddev->bitmap, sector_nr, &sync_blocks, still_degraded); | |
4505 | ||
83206d66 | 4506 | set_bit(STRIPE_SYNC_REQUESTED, &sh->state); |
1da177e4 | 4507 | |
1442577b | 4508 | handle_stripe(sh); |
1da177e4 LT |
4509 | release_stripe(sh); |
4510 | ||
4511 | return STRIPE_SECTORS; | |
4512 | } | |
4513 | ||
d1688a6d | 4514 | static int retry_aligned_read(struct r5conf *conf, struct bio *raid_bio) |
46031f9a RBJ |
4515 | { |
4516 | /* We may not be able to submit a whole bio at once as there | |
4517 | * may not be enough stripe_heads available. | |
4518 | * We cannot pre-allocate enough stripe_heads as we may need | |
4519 | * more than exist in the cache (if we allow ever large chunks). | |
4520 | * So we do one stripe head at a time and record in | |
4521 | * ->bi_hw_segments how many have been done. | |
4522 | * | |
4523 | * We *know* that this entire raid_bio is in one chunk, so | |
4524 | * it will be only one 'dd_idx' and only need one call to raid5_compute_sector. | |
4525 | */ | |
4526 | struct stripe_head *sh; | |
911d4ee8 | 4527 | int dd_idx; |
46031f9a RBJ |
4528 | sector_t sector, logical_sector, last_sector; |
4529 | int scnt = 0; | |
4530 | int remaining; | |
4531 | int handled = 0; | |
4532 | ||
4533 | logical_sector = raid_bio->bi_sector & ~((sector_t)STRIPE_SECTORS-1); | |
112bf897 | 4534 | sector = raid5_compute_sector(conf, logical_sector, |
911d4ee8 | 4535 | 0, &dd_idx, NULL); |
46031f9a RBJ |
4536 | last_sector = raid_bio->bi_sector + (raid_bio->bi_size>>9); |
4537 | ||
4538 | for (; logical_sector < last_sector; | |
387bb173 NB |
4539 | logical_sector += STRIPE_SECTORS, |
4540 | sector += STRIPE_SECTORS, | |
4541 | scnt++) { | |
46031f9a | 4542 | |
960e739d | 4543 | if (scnt < raid5_bi_hw_segments(raid_bio)) |
46031f9a RBJ |
4544 | /* already done this stripe */ |
4545 | continue; | |
4546 | ||
a8c906ca | 4547 | sh = get_active_stripe(conf, sector, 0, 1, 0); |
46031f9a RBJ |
4548 | |
4549 | if (!sh) { | |
4550 | /* failed to get a stripe - must wait */ | |
960e739d | 4551 | raid5_set_bi_hw_segments(raid_bio, scnt); |
46031f9a RBJ |
4552 | conf->retry_read_aligned = raid_bio; |
4553 | return handled; | |
4554 | } | |
4555 | ||
387bb173 NB |
4556 | if (!add_stripe_bio(sh, raid_bio, dd_idx, 0)) { |
4557 | release_stripe(sh); | |
960e739d | 4558 | raid5_set_bi_hw_segments(raid_bio, scnt); |
387bb173 NB |
4559 | conf->retry_read_aligned = raid_bio; |
4560 | return handled; | |
4561 | } | |
4562 | ||
36d1c647 | 4563 | handle_stripe(sh); |
46031f9a RBJ |
4564 | release_stripe(sh); |
4565 | handled++; | |
4566 | } | |
4567 | spin_lock_irq(&conf->device_lock); | |
960e739d | 4568 | remaining = raid5_dec_bi_phys_segments(raid_bio); |
46031f9a | 4569 | spin_unlock_irq(&conf->device_lock); |
0e13fe23 NB |
4570 | if (remaining == 0) |
4571 | bio_endio(raid_bio, 0); | |
46031f9a RBJ |
4572 | if (atomic_dec_and_test(&conf->active_aligned_reads)) |
4573 | wake_up(&conf->wait_for_stripe); | |
4574 | return handled; | |
4575 | } | |
4576 | ||
46031f9a | 4577 | |
1da177e4 LT |
4578 | /* |
4579 | * This is our raid5 kernel thread. | |
4580 | * | |
4581 | * We scan the hash table for stripes which can be handled now. | |
4582 | * During the scan, completed stripes are saved for us by the interrupt | |
4583 | * handler, so that they will not have to wait for our next wakeup. | |
4584 | */ | |
fd01b88c | 4585 | static void raid5d(struct mddev *mddev) |
1da177e4 LT |
4586 | { |
4587 | struct stripe_head *sh; | |
d1688a6d | 4588 | struct r5conf *conf = mddev->private; |
1da177e4 | 4589 | int handled; |
e1dfa0a2 | 4590 | struct blk_plug plug; |
1da177e4 | 4591 | |
45b4233c | 4592 | pr_debug("+++ raid5d active\n"); |
1da177e4 LT |
4593 | |
4594 | md_check_recovery(mddev); | |
1da177e4 | 4595 | |
e1dfa0a2 | 4596 | blk_start_plug(&plug); |
1da177e4 LT |
4597 | handled = 0; |
4598 | spin_lock_irq(&conf->device_lock); | |
4599 | while (1) { | |
46031f9a | 4600 | struct bio *bio; |
1da177e4 | 4601 | |
0021b7bc | 4602 | if ( |
7c13edc8 N |
4603 | !list_empty(&conf->bitmap_list)) { |
4604 | /* Now is a good time to flush some bitmap updates */ | |
4605 | conf->seq_flush++; | |
700e432d | 4606 | spin_unlock_irq(&conf->device_lock); |
72626685 | 4607 | bitmap_unplug(mddev->bitmap); |
700e432d | 4608 | spin_lock_irq(&conf->device_lock); |
7c13edc8 | 4609 | conf->seq_write = conf->seq_flush; |
72626685 N |
4610 | activate_bit_delay(conf); |
4611 | } | |
0021b7bc | 4612 | raid5_activate_delayed(conf); |
72626685 | 4613 | |
46031f9a RBJ |
4614 | while ((bio = remove_bio_from_retry(conf))) { |
4615 | int ok; | |
4616 | spin_unlock_irq(&conf->device_lock); | |
4617 | ok = retry_aligned_read(conf, bio); | |
4618 | spin_lock_irq(&conf->device_lock); | |
4619 | if (!ok) | |
4620 | break; | |
4621 | handled++; | |
4622 | } | |
4623 | ||
8b3e6cdc DW |
4624 | sh = __get_priority_stripe(conf); |
4625 | ||
c9f21aaf | 4626 | if (!sh) |
1da177e4 | 4627 | break; |
1da177e4 LT |
4628 | spin_unlock_irq(&conf->device_lock); |
4629 | ||
4630 | handled++; | |
417b8d4a DW |
4631 | handle_stripe(sh); |
4632 | release_stripe(sh); | |
4633 | cond_resched(); | |
1da177e4 | 4634 | |
de393cde N |
4635 | if (mddev->flags & ~(1<<MD_CHANGE_PENDING)) |
4636 | md_check_recovery(mddev); | |
4637 | ||
1da177e4 LT |
4638 | spin_lock_irq(&conf->device_lock); |
4639 | } | |
45b4233c | 4640 | pr_debug("%d stripes handled\n", handled); |
1da177e4 LT |
4641 | |
4642 | spin_unlock_irq(&conf->device_lock); | |
4643 | ||
c9f21aaf | 4644 | async_tx_issue_pending_all(); |
e1dfa0a2 | 4645 | blk_finish_plug(&plug); |
1da177e4 | 4646 | |
45b4233c | 4647 | pr_debug("--- raid5d inactive\n"); |
1da177e4 LT |
4648 | } |
4649 | ||
3f294f4f | 4650 | static ssize_t |
fd01b88c | 4651 | raid5_show_stripe_cache_size(struct mddev *mddev, char *page) |
3f294f4f | 4652 | { |
d1688a6d | 4653 | struct r5conf *conf = mddev->private; |
96de1e66 N |
4654 | if (conf) |
4655 | return sprintf(page, "%d\n", conf->max_nr_stripes); | |
4656 | else | |
4657 | return 0; | |
3f294f4f N |
4658 | } |
4659 | ||
c41d4ac4 | 4660 | int |
fd01b88c | 4661 | raid5_set_cache_size(struct mddev *mddev, int size) |
3f294f4f | 4662 | { |
d1688a6d | 4663 | struct r5conf *conf = mddev->private; |
b5470dc5 DW |
4664 | int err; |
4665 | ||
c41d4ac4 | 4666 | if (size <= 16 || size > 32768) |
3f294f4f | 4667 | return -EINVAL; |
c41d4ac4 | 4668 | while (size < conf->max_nr_stripes) { |
3f294f4f N |
4669 | if (drop_one_stripe(conf)) |
4670 | conf->max_nr_stripes--; | |
4671 | else | |
4672 | break; | |
4673 | } | |
b5470dc5 DW |
4674 | err = md_allow_write(mddev); |
4675 | if (err) | |
4676 | return err; | |
c41d4ac4 | 4677 | while (size > conf->max_nr_stripes) { |
3f294f4f N |
4678 | if (grow_one_stripe(conf)) |
4679 | conf->max_nr_stripes++; | |
4680 | else break; | |
4681 | } | |
c41d4ac4 N |
4682 | return 0; |
4683 | } | |
4684 | EXPORT_SYMBOL(raid5_set_cache_size); | |
4685 | ||
4686 | static ssize_t | |
fd01b88c | 4687 | raid5_store_stripe_cache_size(struct mddev *mddev, const char *page, size_t len) |
c41d4ac4 | 4688 | { |
d1688a6d | 4689 | struct r5conf *conf = mddev->private; |
c41d4ac4 N |
4690 | unsigned long new; |
4691 | int err; | |
4692 | ||
4693 | if (len >= PAGE_SIZE) | |
4694 | return -EINVAL; | |
4695 | if (!conf) | |
4696 | return -ENODEV; | |
4697 | ||
4698 | if (strict_strtoul(page, 10, &new)) | |
4699 | return -EINVAL; | |
4700 | err = raid5_set_cache_size(mddev, new); | |
4701 | if (err) | |
4702 | return err; | |
3f294f4f N |
4703 | return len; |
4704 | } | |
007583c9 | 4705 | |
96de1e66 N |
4706 | static struct md_sysfs_entry |
4707 | raid5_stripecache_size = __ATTR(stripe_cache_size, S_IRUGO | S_IWUSR, | |
4708 | raid5_show_stripe_cache_size, | |
4709 | raid5_store_stripe_cache_size); | |
3f294f4f | 4710 | |
8b3e6cdc | 4711 | static ssize_t |
fd01b88c | 4712 | raid5_show_preread_threshold(struct mddev *mddev, char *page) |
8b3e6cdc | 4713 | { |
d1688a6d | 4714 | struct r5conf *conf = mddev->private; |
8b3e6cdc DW |
4715 | if (conf) |
4716 | return sprintf(page, "%d\n", conf->bypass_threshold); | |
4717 | else | |
4718 | return 0; | |
4719 | } | |
4720 | ||
4721 | static ssize_t | |
fd01b88c | 4722 | raid5_store_preread_threshold(struct mddev *mddev, const char *page, size_t len) |
8b3e6cdc | 4723 | { |
d1688a6d | 4724 | struct r5conf *conf = mddev->private; |
4ef197d8 | 4725 | unsigned long new; |
8b3e6cdc DW |
4726 | if (len >= PAGE_SIZE) |
4727 | return -EINVAL; | |
4728 | if (!conf) | |
4729 | return -ENODEV; | |
4730 | ||
4ef197d8 | 4731 | if (strict_strtoul(page, 10, &new)) |
8b3e6cdc | 4732 | return -EINVAL; |
4ef197d8 | 4733 | if (new > conf->max_nr_stripes) |
8b3e6cdc DW |
4734 | return -EINVAL; |
4735 | conf->bypass_threshold = new; | |
4736 | return len; | |
4737 | } | |
4738 | ||
4739 | static struct md_sysfs_entry | |
4740 | raid5_preread_bypass_threshold = __ATTR(preread_bypass_threshold, | |
4741 | S_IRUGO | S_IWUSR, | |
4742 | raid5_show_preread_threshold, | |
4743 | raid5_store_preread_threshold); | |
4744 | ||
3f294f4f | 4745 | static ssize_t |
fd01b88c | 4746 | stripe_cache_active_show(struct mddev *mddev, char *page) |
3f294f4f | 4747 | { |
d1688a6d | 4748 | struct r5conf *conf = mddev->private; |
96de1e66 N |
4749 | if (conf) |
4750 | return sprintf(page, "%d\n", atomic_read(&conf->active_stripes)); | |
4751 | else | |
4752 | return 0; | |
3f294f4f N |
4753 | } |
4754 | ||
96de1e66 N |
4755 | static struct md_sysfs_entry |
4756 | raid5_stripecache_active = __ATTR_RO(stripe_cache_active); | |
3f294f4f | 4757 | |
007583c9 | 4758 | static struct attribute *raid5_attrs[] = { |
3f294f4f N |
4759 | &raid5_stripecache_size.attr, |
4760 | &raid5_stripecache_active.attr, | |
8b3e6cdc | 4761 | &raid5_preread_bypass_threshold.attr, |
3f294f4f N |
4762 | NULL, |
4763 | }; | |
007583c9 N |
4764 | static struct attribute_group raid5_attrs_group = { |
4765 | .name = NULL, | |
4766 | .attrs = raid5_attrs, | |
3f294f4f N |
4767 | }; |
4768 | ||
80c3a6ce | 4769 | static sector_t |
fd01b88c | 4770 | raid5_size(struct mddev *mddev, sector_t sectors, int raid_disks) |
80c3a6ce | 4771 | { |
d1688a6d | 4772 | struct r5conf *conf = mddev->private; |
80c3a6ce DW |
4773 | |
4774 | if (!sectors) | |
4775 | sectors = mddev->dev_sectors; | |
5e5e3e78 | 4776 | if (!raid_disks) |
7ec05478 | 4777 | /* size is defined by the smallest of previous and new size */ |
5e5e3e78 | 4778 | raid_disks = min(conf->raid_disks, conf->previous_raid_disks); |
80c3a6ce | 4779 | |
9d8f0363 | 4780 | sectors &= ~((sector_t)mddev->chunk_sectors - 1); |
664e7c41 | 4781 | sectors &= ~((sector_t)mddev->new_chunk_sectors - 1); |
80c3a6ce DW |
4782 | return sectors * (raid_disks - conf->max_degraded); |
4783 | } | |
4784 | ||
d1688a6d | 4785 | static void raid5_free_percpu(struct r5conf *conf) |
36d1c647 DW |
4786 | { |
4787 | struct raid5_percpu *percpu; | |
4788 | unsigned long cpu; | |
4789 | ||
4790 | if (!conf->percpu) | |
4791 | return; | |
4792 | ||
4793 | get_online_cpus(); | |
4794 | for_each_possible_cpu(cpu) { | |
4795 | percpu = per_cpu_ptr(conf->percpu, cpu); | |
4796 | safe_put_page(percpu->spare_page); | |
d6f38f31 | 4797 | kfree(percpu->scribble); |
36d1c647 DW |
4798 | } |
4799 | #ifdef CONFIG_HOTPLUG_CPU | |
4800 | unregister_cpu_notifier(&conf->cpu_notify); | |
4801 | #endif | |
4802 | put_online_cpus(); | |
4803 | ||
4804 | free_percpu(conf->percpu); | |
4805 | } | |
4806 | ||
d1688a6d | 4807 | static void free_conf(struct r5conf *conf) |
95fc17aa DW |
4808 | { |
4809 | shrink_stripes(conf); | |
36d1c647 | 4810 | raid5_free_percpu(conf); |
95fc17aa DW |
4811 | kfree(conf->disks); |
4812 | kfree(conf->stripe_hashtbl); | |
4813 | kfree(conf); | |
4814 | } | |
4815 | ||
36d1c647 DW |
4816 | #ifdef CONFIG_HOTPLUG_CPU |
4817 | static int raid456_cpu_notify(struct notifier_block *nfb, unsigned long action, | |
4818 | void *hcpu) | |
4819 | { | |
d1688a6d | 4820 | struct r5conf *conf = container_of(nfb, struct r5conf, cpu_notify); |
36d1c647 DW |
4821 | long cpu = (long)hcpu; |
4822 | struct raid5_percpu *percpu = per_cpu_ptr(conf->percpu, cpu); | |
4823 | ||
4824 | switch (action) { | |
4825 | case CPU_UP_PREPARE: | |
4826 | case CPU_UP_PREPARE_FROZEN: | |
d6f38f31 | 4827 | if (conf->level == 6 && !percpu->spare_page) |
36d1c647 | 4828 | percpu->spare_page = alloc_page(GFP_KERNEL); |
d6f38f31 DW |
4829 | if (!percpu->scribble) |
4830 | percpu->scribble = kmalloc(conf->scribble_len, GFP_KERNEL); | |
4831 | ||
4832 | if (!percpu->scribble || | |
4833 | (conf->level == 6 && !percpu->spare_page)) { | |
4834 | safe_put_page(percpu->spare_page); | |
4835 | kfree(percpu->scribble); | |
36d1c647 DW |
4836 | pr_err("%s: failed memory allocation for cpu%ld\n", |
4837 | __func__, cpu); | |
55af6bb5 | 4838 | return notifier_from_errno(-ENOMEM); |
36d1c647 DW |
4839 | } |
4840 | break; | |
4841 | case CPU_DEAD: | |
4842 | case CPU_DEAD_FROZEN: | |
4843 | safe_put_page(percpu->spare_page); | |
d6f38f31 | 4844 | kfree(percpu->scribble); |
36d1c647 | 4845 | percpu->spare_page = NULL; |
d6f38f31 | 4846 | percpu->scribble = NULL; |
36d1c647 DW |
4847 | break; |
4848 | default: | |
4849 | break; | |
4850 | } | |
4851 | return NOTIFY_OK; | |
4852 | } | |
4853 | #endif | |
4854 | ||
d1688a6d | 4855 | static int raid5_alloc_percpu(struct r5conf *conf) |
36d1c647 DW |
4856 | { |
4857 | unsigned long cpu; | |
4858 | struct page *spare_page; | |
a29d8b8e | 4859 | struct raid5_percpu __percpu *allcpus; |
d6f38f31 | 4860 | void *scribble; |
36d1c647 DW |
4861 | int err; |
4862 | ||
36d1c647 DW |
4863 | allcpus = alloc_percpu(struct raid5_percpu); |
4864 | if (!allcpus) | |
4865 | return -ENOMEM; | |
4866 | conf->percpu = allcpus; | |
4867 | ||
4868 | get_online_cpus(); | |
4869 | err = 0; | |
4870 | for_each_present_cpu(cpu) { | |
d6f38f31 DW |
4871 | if (conf->level == 6) { |
4872 | spare_page = alloc_page(GFP_KERNEL); | |
4873 | if (!spare_page) { | |
4874 | err = -ENOMEM; | |
4875 | break; | |
4876 | } | |
4877 | per_cpu_ptr(conf->percpu, cpu)->spare_page = spare_page; | |
4878 | } | |
5e5e3e78 | 4879 | scribble = kmalloc(conf->scribble_len, GFP_KERNEL); |
d6f38f31 | 4880 | if (!scribble) { |
36d1c647 DW |
4881 | err = -ENOMEM; |
4882 | break; | |
4883 | } | |
d6f38f31 | 4884 | per_cpu_ptr(conf->percpu, cpu)->scribble = scribble; |
36d1c647 DW |
4885 | } |
4886 | #ifdef CONFIG_HOTPLUG_CPU | |
4887 | conf->cpu_notify.notifier_call = raid456_cpu_notify; | |
4888 | conf->cpu_notify.priority = 0; | |
4889 | if (err == 0) | |
4890 | err = register_cpu_notifier(&conf->cpu_notify); | |
4891 | #endif | |
4892 | put_online_cpus(); | |
4893 | ||
4894 | return err; | |
4895 | } | |
4896 | ||
d1688a6d | 4897 | static struct r5conf *setup_conf(struct mddev *mddev) |
1da177e4 | 4898 | { |
d1688a6d | 4899 | struct r5conf *conf; |
5e5e3e78 | 4900 | int raid_disk, memory, max_disks; |
3cb03002 | 4901 | struct md_rdev *rdev; |
1da177e4 | 4902 | struct disk_info *disk; |
0232605d | 4903 | char pers_name[6]; |
1da177e4 | 4904 | |
91adb564 N |
4905 | if (mddev->new_level != 5 |
4906 | && mddev->new_level != 4 | |
4907 | && mddev->new_level != 6) { | |
0c55e022 | 4908 | printk(KERN_ERR "md/raid:%s: raid level not set to 4/5/6 (%d)\n", |
91adb564 N |
4909 | mdname(mddev), mddev->new_level); |
4910 | return ERR_PTR(-EIO); | |
1da177e4 | 4911 | } |
91adb564 N |
4912 | if ((mddev->new_level == 5 |
4913 | && !algorithm_valid_raid5(mddev->new_layout)) || | |
4914 | (mddev->new_level == 6 | |
4915 | && !algorithm_valid_raid6(mddev->new_layout))) { | |
0c55e022 | 4916 | printk(KERN_ERR "md/raid:%s: layout %d not supported\n", |
91adb564 N |
4917 | mdname(mddev), mddev->new_layout); |
4918 | return ERR_PTR(-EIO); | |
99c0fb5f | 4919 | } |
91adb564 | 4920 | if (mddev->new_level == 6 && mddev->raid_disks < 4) { |
0c55e022 | 4921 | printk(KERN_ERR "md/raid:%s: not enough configured devices (%d, minimum 4)\n", |
91adb564 N |
4922 | mdname(mddev), mddev->raid_disks); |
4923 | return ERR_PTR(-EINVAL); | |
4bbf3771 N |
4924 | } |
4925 | ||
664e7c41 AN |
4926 | if (!mddev->new_chunk_sectors || |
4927 | (mddev->new_chunk_sectors << 9) % PAGE_SIZE || | |
4928 | !is_power_of_2(mddev->new_chunk_sectors)) { | |
0c55e022 N |
4929 | printk(KERN_ERR "md/raid:%s: invalid chunk size %d\n", |
4930 | mdname(mddev), mddev->new_chunk_sectors << 9); | |
91adb564 | 4931 | return ERR_PTR(-EINVAL); |
f6705578 N |
4932 | } |
4933 | ||
d1688a6d | 4934 | conf = kzalloc(sizeof(struct r5conf), GFP_KERNEL); |
91adb564 | 4935 | if (conf == NULL) |
1da177e4 | 4936 | goto abort; |
f5efd45a DW |
4937 | spin_lock_init(&conf->device_lock); |
4938 | init_waitqueue_head(&conf->wait_for_stripe); | |
4939 | init_waitqueue_head(&conf->wait_for_overlap); | |
4940 | INIT_LIST_HEAD(&conf->handle_list); | |
4941 | INIT_LIST_HEAD(&conf->hold_list); | |
4942 | INIT_LIST_HEAD(&conf->delayed_list); | |
4943 | INIT_LIST_HEAD(&conf->bitmap_list); | |
4944 | INIT_LIST_HEAD(&conf->inactive_list); | |
4945 | atomic_set(&conf->active_stripes, 0); | |
4946 | atomic_set(&conf->preread_active_stripes, 0); | |
4947 | atomic_set(&conf->active_aligned_reads, 0); | |
4948 | conf->bypass_threshold = BYPASS_THRESHOLD; | |
d890fa2b | 4949 | conf->recovery_disabled = mddev->recovery_disabled - 1; |
91adb564 N |
4950 | |
4951 | conf->raid_disks = mddev->raid_disks; | |
4952 | if (mddev->reshape_position == MaxSector) | |
4953 | conf->previous_raid_disks = mddev->raid_disks; | |
4954 | else | |
f6705578 | 4955 | conf->previous_raid_disks = mddev->raid_disks - mddev->delta_disks; |
5e5e3e78 N |
4956 | max_disks = max(conf->raid_disks, conf->previous_raid_disks); |
4957 | conf->scribble_len = scribble_len(max_disks); | |
f6705578 | 4958 | |
5e5e3e78 | 4959 | conf->disks = kzalloc(max_disks * sizeof(struct disk_info), |
b55e6bfc N |
4960 | GFP_KERNEL); |
4961 | if (!conf->disks) | |
4962 | goto abort; | |
9ffae0cf | 4963 | |
1da177e4 LT |
4964 | conf->mddev = mddev; |
4965 | ||
fccddba0 | 4966 | if ((conf->stripe_hashtbl = kzalloc(PAGE_SIZE, GFP_KERNEL)) == NULL) |
1da177e4 | 4967 | goto abort; |
1da177e4 | 4968 | |
36d1c647 DW |
4969 | conf->level = mddev->new_level; |
4970 | if (raid5_alloc_percpu(conf) != 0) | |
4971 | goto abort; | |
4972 | ||
0c55e022 | 4973 | pr_debug("raid456: run(%s) called.\n", mdname(mddev)); |
1da177e4 | 4974 | |
dafb20fa | 4975 | rdev_for_each(rdev, mddev) { |
1da177e4 | 4976 | raid_disk = rdev->raid_disk; |
5e5e3e78 | 4977 | if (raid_disk >= max_disks |
1da177e4 LT |
4978 | || raid_disk < 0) |
4979 | continue; | |
4980 | disk = conf->disks + raid_disk; | |
4981 | ||
17045f52 N |
4982 | if (test_bit(Replacement, &rdev->flags)) { |
4983 | if (disk->replacement) | |
4984 | goto abort; | |
4985 | disk->replacement = rdev; | |
4986 | } else { | |
4987 | if (disk->rdev) | |
4988 | goto abort; | |
4989 | disk->rdev = rdev; | |
4990 | } | |
1da177e4 | 4991 | |
b2d444d7 | 4992 | if (test_bit(In_sync, &rdev->flags)) { |
1da177e4 | 4993 | char b[BDEVNAME_SIZE]; |
0c55e022 N |
4994 | printk(KERN_INFO "md/raid:%s: device %s operational as raid" |
4995 | " disk %d\n", | |
4996 | mdname(mddev), bdevname(rdev->bdev, b), raid_disk); | |
d6b212f4 | 4997 | } else if (rdev->saved_raid_disk != raid_disk) |
8c2e870a NB |
4998 | /* Cannot rely on bitmap to complete recovery */ |
4999 | conf->fullsync = 1; | |
1da177e4 LT |
5000 | } |
5001 | ||
09c9e5fa | 5002 | conf->chunk_sectors = mddev->new_chunk_sectors; |
91adb564 | 5003 | conf->level = mddev->new_level; |
16a53ecc N |
5004 | if (conf->level == 6) |
5005 | conf->max_degraded = 2; | |
5006 | else | |
5007 | conf->max_degraded = 1; | |
91adb564 | 5008 | conf->algorithm = mddev->new_layout; |
1da177e4 | 5009 | conf->max_nr_stripes = NR_STRIPES; |
fef9c61f | 5010 | conf->reshape_progress = mddev->reshape_position; |
e183eaed | 5011 | if (conf->reshape_progress != MaxSector) { |
09c9e5fa | 5012 | conf->prev_chunk_sectors = mddev->chunk_sectors; |
e183eaed N |
5013 | conf->prev_algo = mddev->layout; |
5014 | } | |
1da177e4 | 5015 | |
91adb564 | 5016 | memory = conf->max_nr_stripes * (sizeof(struct stripe_head) + |
5e5e3e78 | 5017 | max_disks * ((sizeof(struct bio) + PAGE_SIZE))) / 1024; |
91adb564 N |
5018 | if (grow_stripes(conf, conf->max_nr_stripes)) { |
5019 | printk(KERN_ERR | |
0c55e022 N |
5020 | "md/raid:%s: couldn't allocate %dkB for buffers\n", |
5021 | mdname(mddev), memory); | |
91adb564 N |
5022 | goto abort; |
5023 | } else | |
0c55e022 N |
5024 | printk(KERN_INFO "md/raid:%s: allocated %dkB\n", |
5025 | mdname(mddev), memory); | |
1da177e4 | 5026 | |
0232605d N |
5027 | sprintf(pers_name, "raid%d", mddev->new_level); |
5028 | conf->thread = md_register_thread(raid5d, mddev, pers_name); | |
91adb564 N |
5029 | if (!conf->thread) { |
5030 | printk(KERN_ERR | |
0c55e022 | 5031 | "md/raid:%s: couldn't allocate thread.\n", |
91adb564 | 5032 | mdname(mddev)); |
16a53ecc N |
5033 | goto abort; |
5034 | } | |
91adb564 N |
5035 | |
5036 | return conf; | |
5037 | ||
5038 | abort: | |
5039 | if (conf) { | |
95fc17aa | 5040 | free_conf(conf); |
91adb564 N |
5041 | return ERR_PTR(-EIO); |
5042 | } else | |
5043 | return ERR_PTR(-ENOMEM); | |
5044 | } | |
5045 | ||
c148ffdc N |
5046 | |
5047 | static int only_parity(int raid_disk, int algo, int raid_disks, int max_degraded) | |
5048 | { | |
5049 | switch (algo) { | |
5050 | case ALGORITHM_PARITY_0: | |
5051 | if (raid_disk < max_degraded) | |
5052 | return 1; | |
5053 | break; | |
5054 | case ALGORITHM_PARITY_N: | |
5055 | if (raid_disk >= raid_disks - max_degraded) | |
5056 | return 1; | |
5057 | break; | |
5058 | case ALGORITHM_PARITY_0_6: | |
5059 | if (raid_disk == 0 || | |
5060 | raid_disk == raid_disks - 1) | |
5061 | return 1; | |
5062 | break; | |
5063 | case ALGORITHM_LEFT_ASYMMETRIC_6: | |
5064 | case ALGORITHM_RIGHT_ASYMMETRIC_6: | |
5065 | case ALGORITHM_LEFT_SYMMETRIC_6: | |
5066 | case ALGORITHM_RIGHT_SYMMETRIC_6: | |
5067 | if (raid_disk == raid_disks - 1) | |
5068 | return 1; | |
5069 | } | |
5070 | return 0; | |
5071 | } | |
5072 | ||
fd01b88c | 5073 | static int run(struct mddev *mddev) |
91adb564 | 5074 | { |
d1688a6d | 5075 | struct r5conf *conf; |
9f7c2220 | 5076 | int working_disks = 0; |
c148ffdc | 5077 | int dirty_parity_disks = 0; |
3cb03002 | 5078 | struct md_rdev *rdev; |
c148ffdc | 5079 | sector_t reshape_offset = 0; |
17045f52 | 5080 | int i; |
b5254dd5 N |
5081 | long long min_offset_diff = 0; |
5082 | int first = 1; | |
91adb564 | 5083 | |
8c6ac868 | 5084 | if (mddev->recovery_cp != MaxSector) |
0c55e022 | 5085 | printk(KERN_NOTICE "md/raid:%s: not clean" |
8c6ac868 AN |
5086 | " -- starting background reconstruction\n", |
5087 | mdname(mddev)); | |
b5254dd5 N |
5088 | |
5089 | rdev_for_each(rdev, mddev) { | |
5090 | long long diff; | |
5091 | if (rdev->raid_disk < 0) | |
5092 | continue; | |
5093 | diff = (rdev->new_data_offset - rdev->data_offset); | |
5094 | if (first) { | |
5095 | min_offset_diff = diff; | |
5096 | first = 0; | |
5097 | } else if (mddev->reshape_backwards && | |
5098 | diff < min_offset_diff) | |
5099 | min_offset_diff = diff; | |
5100 | else if (!mddev->reshape_backwards && | |
5101 | diff > min_offset_diff) | |
5102 | min_offset_diff = diff; | |
5103 | } | |
5104 | ||
91adb564 N |
5105 | if (mddev->reshape_position != MaxSector) { |
5106 | /* Check that we can continue the reshape. | |
b5254dd5 N |
5107 | * Difficulties arise if the stripe we would write to |
5108 | * next is at or after the stripe we would read from next. | |
5109 | * For a reshape that changes the number of devices, this | |
5110 | * is only possible for a very short time, and mdadm makes | |
5111 | * sure that time appears to have past before assembling | |
5112 | * the array. So we fail if that time hasn't passed. | |
5113 | * For a reshape that keeps the number of devices the same | |
5114 | * mdadm must be monitoring the reshape can keeping the | |
5115 | * critical areas read-only and backed up. It will start | |
5116 | * the array in read-only mode, so we check for that. | |
91adb564 N |
5117 | */ |
5118 | sector_t here_new, here_old; | |
5119 | int old_disks; | |
18b00334 | 5120 | int max_degraded = (mddev->level == 6 ? 2 : 1); |
91adb564 | 5121 | |
88ce4930 | 5122 | if (mddev->new_level != mddev->level) { |
0c55e022 | 5123 | printk(KERN_ERR "md/raid:%s: unsupported reshape " |
91adb564 N |
5124 | "required - aborting.\n", |
5125 | mdname(mddev)); | |
5126 | return -EINVAL; | |
5127 | } | |
91adb564 N |
5128 | old_disks = mddev->raid_disks - mddev->delta_disks; |
5129 | /* reshape_position must be on a new-stripe boundary, and one | |
5130 | * further up in new geometry must map after here in old | |
5131 | * geometry. | |
5132 | */ | |
5133 | here_new = mddev->reshape_position; | |
664e7c41 | 5134 | if (sector_div(here_new, mddev->new_chunk_sectors * |
91adb564 | 5135 | (mddev->raid_disks - max_degraded))) { |
0c55e022 N |
5136 | printk(KERN_ERR "md/raid:%s: reshape_position not " |
5137 | "on a stripe boundary\n", mdname(mddev)); | |
91adb564 N |
5138 | return -EINVAL; |
5139 | } | |
c148ffdc | 5140 | reshape_offset = here_new * mddev->new_chunk_sectors; |
91adb564 N |
5141 | /* here_new is the stripe we will write to */ |
5142 | here_old = mddev->reshape_position; | |
9d8f0363 | 5143 | sector_div(here_old, mddev->chunk_sectors * |
91adb564 N |
5144 | (old_disks-max_degraded)); |
5145 | /* here_old is the first stripe that we might need to read | |
5146 | * from */ | |
67ac6011 | 5147 | if (mddev->delta_disks == 0) { |
b5254dd5 N |
5148 | if ((here_new * mddev->new_chunk_sectors != |
5149 | here_old * mddev->chunk_sectors)) { | |
5150 | printk(KERN_ERR "md/raid:%s: reshape position is" | |
5151 | " confused - aborting\n", mdname(mddev)); | |
5152 | return -EINVAL; | |
5153 | } | |
67ac6011 | 5154 | /* We cannot be sure it is safe to start an in-place |
b5254dd5 | 5155 | * reshape. It is only safe if user-space is monitoring |
67ac6011 N |
5156 | * and taking constant backups. |
5157 | * mdadm always starts a situation like this in | |
5158 | * readonly mode so it can take control before | |
5159 | * allowing any writes. So just check for that. | |
5160 | */ | |
b5254dd5 N |
5161 | if (abs(min_offset_diff) >= mddev->chunk_sectors && |
5162 | abs(min_offset_diff) >= mddev->new_chunk_sectors) | |
5163 | /* not really in-place - so OK */; | |
5164 | else if (mddev->ro == 0) { | |
5165 | printk(KERN_ERR "md/raid:%s: in-place reshape " | |
5166 | "must be started in read-only mode " | |
5167 | "- aborting\n", | |
0c55e022 | 5168 | mdname(mddev)); |
67ac6011 N |
5169 | return -EINVAL; |
5170 | } | |
2c810cdd | 5171 | } else if (mddev->reshape_backwards |
b5254dd5 | 5172 | ? (here_new * mddev->new_chunk_sectors + min_offset_diff <= |
67ac6011 N |
5173 | here_old * mddev->chunk_sectors) |
5174 | : (here_new * mddev->new_chunk_sectors >= | |
b5254dd5 | 5175 | here_old * mddev->chunk_sectors + (-min_offset_diff))) { |
91adb564 | 5176 | /* Reading from the same stripe as writing to - bad */ |
0c55e022 N |
5177 | printk(KERN_ERR "md/raid:%s: reshape_position too early for " |
5178 | "auto-recovery - aborting.\n", | |
5179 | mdname(mddev)); | |
91adb564 N |
5180 | return -EINVAL; |
5181 | } | |
0c55e022 N |
5182 | printk(KERN_INFO "md/raid:%s: reshape will continue\n", |
5183 | mdname(mddev)); | |
91adb564 N |
5184 | /* OK, we should be able to continue; */ |
5185 | } else { | |
5186 | BUG_ON(mddev->level != mddev->new_level); | |
5187 | BUG_ON(mddev->layout != mddev->new_layout); | |
664e7c41 | 5188 | BUG_ON(mddev->chunk_sectors != mddev->new_chunk_sectors); |
91adb564 | 5189 | BUG_ON(mddev->delta_disks != 0); |
1da177e4 | 5190 | } |
91adb564 | 5191 | |
245f46c2 N |
5192 | if (mddev->private == NULL) |
5193 | conf = setup_conf(mddev); | |
5194 | else | |
5195 | conf = mddev->private; | |
5196 | ||
91adb564 N |
5197 | if (IS_ERR(conf)) |
5198 | return PTR_ERR(conf); | |
5199 | ||
b5254dd5 | 5200 | conf->min_offset_diff = min_offset_diff; |
91adb564 N |
5201 | mddev->thread = conf->thread; |
5202 | conf->thread = NULL; | |
5203 | mddev->private = conf; | |
5204 | ||
17045f52 N |
5205 | for (i = 0; i < conf->raid_disks && conf->previous_raid_disks; |
5206 | i++) { | |
5207 | rdev = conf->disks[i].rdev; | |
5208 | if (!rdev && conf->disks[i].replacement) { | |
5209 | /* The replacement is all we have yet */ | |
5210 | rdev = conf->disks[i].replacement; | |
5211 | conf->disks[i].replacement = NULL; | |
5212 | clear_bit(Replacement, &rdev->flags); | |
5213 | conf->disks[i].rdev = rdev; | |
5214 | } | |
5215 | if (!rdev) | |
c148ffdc | 5216 | continue; |
17045f52 N |
5217 | if (conf->disks[i].replacement && |
5218 | conf->reshape_progress != MaxSector) { | |
5219 | /* replacements and reshape simply do not mix. */ | |
5220 | printk(KERN_ERR "md: cannot handle concurrent " | |
5221 | "replacement and reshape.\n"); | |
5222 | goto abort; | |
5223 | } | |
2f115882 | 5224 | if (test_bit(In_sync, &rdev->flags)) { |
91adb564 | 5225 | working_disks++; |
2f115882 N |
5226 | continue; |
5227 | } | |
c148ffdc N |
5228 | /* This disc is not fully in-sync. However if it |
5229 | * just stored parity (beyond the recovery_offset), | |
5230 | * when we don't need to be concerned about the | |
5231 | * array being dirty. | |
5232 | * When reshape goes 'backwards', we never have | |
5233 | * partially completed devices, so we only need | |
5234 | * to worry about reshape going forwards. | |
5235 | */ | |
5236 | /* Hack because v0.91 doesn't store recovery_offset properly. */ | |
5237 | if (mddev->major_version == 0 && | |
5238 | mddev->minor_version > 90) | |
5239 | rdev->recovery_offset = reshape_offset; | |
5240 | ||
c148ffdc N |
5241 | if (rdev->recovery_offset < reshape_offset) { |
5242 | /* We need to check old and new layout */ | |
5243 | if (!only_parity(rdev->raid_disk, | |
5244 | conf->algorithm, | |
5245 | conf->raid_disks, | |
5246 | conf->max_degraded)) | |
5247 | continue; | |
5248 | } | |
5249 | if (!only_parity(rdev->raid_disk, | |
5250 | conf->prev_algo, | |
5251 | conf->previous_raid_disks, | |
5252 | conf->max_degraded)) | |
5253 | continue; | |
5254 | dirty_parity_disks++; | |
5255 | } | |
91adb564 | 5256 | |
17045f52 N |
5257 | /* |
5258 | * 0 for a fully functional array, 1 or 2 for a degraded array. | |
5259 | */ | |
908f4fbd | 5260 | mddev->degraded = calc_degraded(conf); |
91adb564 | 5261 | |
674806d6 | 5262 | if (has_failed(conf)) { |
0c55e022 | 5263 | printk(KERN_ERR "md/raid:%s: not enough operational devices" |
1da177e4 | 5264 | " (%d/%d failed)\n", |
02c2de8c | 5265 | mdname(mddev), mddev->degraded, conf->raid_disks); |
1da177e4 LT |
5266 | goto abort; |
5267 | } | |
5268 | ||
91adb564 | 5269 | /* device size must be a multiple of chunk size */ |
9d8f0363 | 5270 | mddev->dev_sectors &= ~(mddev->chunk_sectors - 1); |
91adb564 N |
5271 | mddev->resync_max_sectors = mddev->dev_sectors; |
5272 | ||
c148ffdc | 5273 | if (mddev->degraded > dirty_parity_disks && |
1da177e4 | 5274 | mddev->recovery_cp != MaxSector) { |
6ff8d8ec N |
5275 | if (mddev->ok_start_degraded) |
5276 | printk(KERN_WARNING | |
0c55e022 N |
5277 | "md/raid:%s: starting dirty degraded array" |
5278 | " - data corruption possible.\n", | |
6ff8d8ec N |
5279 | mdname(mddev)); |
5280 | else { | |
5281 | printk(KERN_ERR | |
0c55e022 | 5282 | "md/raid:%s: cannot start dirty degraded array.\n", |
6ff8d8ec N |
5283 | mdname(mddev)); |
5284 | goto abort; | |
5285 | } | |
1da177e4 LT |
5286 | } |
5287 | ||
1da177e4 | 5288 | if (mddev->degraded == 0) |
0c55e022 N |
5289 | printk(KERN_INFO "md/raid:%s: raid level %d active with %d out of %d" |
5290 | " devices, algorithm %d\n", mdname(mddev), conf->level, | |
e183eaed N |
5291 | mddev->raid_disks-mddev->degraded, mddev->raid_disks, |
5292 | mddev->new_layout); | |
1da177e4 | 5293 | else |
0c55e022 N |
5294 | printk(KERN_ALERT "md/raid:%s: raid level %d active with %d" |
5295 | " out of %d devices, algorithm %d\n", | |
5296 | mdname(mddev), conf->level, | |
5297 | mddev->raid_disks - mddev->degraded, | |
5298 | mddev->raid_disks, mddev->new_layout); | |
1da177e4 LT |
5299 | |
5300 | print_raid5_conf(conf); | |
5301 | ||
fef9c61f | 5302 | if (conf->reshape_progress != MaxSector) { |
fef9c61f | 5303 | conf->reshape_safe = conf->reshape_progress; |
f6705578 N |
5304 | atomic_set(&conf->reshape_stripes, 0); |
5305 | clear_bit(MD_RECOVERY_SYNC, &mddev->recovery); | |
5306 | clear_bit(MD_RECOVERY_CHECK, &mddev->recovery); | |
5307 | set_bit(MD_RECOVERY_RESHAPE, &mddev->recovery); | |
5308 | set_bit(MD_RECOVERY_RUNNING, &mddev->recovery); | |
5309 | mddev->sync_thread = md_register_thread(md_do_sync, mddev, | |
0da3c619 | 5310 | "reshape"); |
f6705578 N |
5311 | } |
5312 | ||
1da177e4 LT |
5313 | |
5314 | /* Ok, everything is just fine now */ | |
a64c876f N |
5315 | if (mddev->to_remove == &raid5_attrs_group) |
5316 | mddev->to_remove = NULL; | |
00bcb4ac N |
5317 | else if (mddev->kobj.sd && |
5318 | sysfs_create_group(&mddev->kobj, &raid5_attrs_group)) | |
5e55e2f5 | 5319 | printk(KERN_WARNING |
4a5add49 | 5320 | "raid5: failed to create sysfs attributes for %s\n", |
5e55e2f5 | 5321 | mdname(mddev)); |
4a5add49 | 5322 | md_set_array_sectors(mddev, raid5_size(mddev, 0, 0)); |
7a5febe9 | 5323 | |
4a5add49 | 5324 | if (mddev->queue) { |
9f7c2220 | 5325 | int chunk_size; |
4a5add49 N |
5326 | /* read-ahead size must cover two whole stripes, which |
5327 | * is 2 * (datadisks) * chunksize where 'n' is the | |
5328 | * number of raid devices | |
5329 | */ | |
5330 | int data_disks = conf->previous_raid_disks - conf->max_degraded; | |
5331 | int stripe = data_disks * | |
5332 | ((mddev->chunk_sectors << 9) / PAGE_SIZE); | |
5333 | if (mddev->queue->backing_dev_info.ra_pages < 2 * stripe) | |
5334 | mddev->queue->backing_dev_info.ra_pages = 2 * stripe; | |
91adb564 | 5335 | |
4a5add49 | 5336 | blk_queue_merge_bvec(mddev->queue, raid5_mergeable_bvec); |
f022b2fd | 5337 | |
11d8a6e3 N |
5338 | mddev->queue->backing_dev_info.congested_data = mddev; |
5339 | mddev->queue->backing_dev_info.congested_fn = raid5_congested; | |
7a5febe9 | 5340 | |
9f7c2220 N |
5341 | chunk_size = mddev->chunk_sectors << 9; |
5342 | blk_queue_io_min(mddev->queue, chunk_size); | |
5343 | blk_queue_io_opt(mddev->queue, chunk_size * | |
5344 | (conf->raid_disks - conf->max_degraded)); | |
8f6c2e4b | 5345 | |
05616be5 | 5346 | rdev_for_each(rdev, mddev) { |
9f7c2220 N |
5347 | disk_stack_limits(mddev->gendisk, rdev->bdev, |
5348 | rdev->data_offset << 9); | |
05616be5 N |
5349 | disk_stack_limits(mddev->gendisk, rdev->bdev, |
5350 | rdev->new_data_offset << 9); | |
5351 | } | |
9f7c2220 | 5352 | } |
23032a0e | 5353 | |
1da177e4 LT |
5354 | return 0; |
5355 | abort: | |
01f96c0a | 5356 | md_unregister_thread(&mddev->thread); |
e4f869d9 N |
5357 | print_raid5_conf(conf); |
5358 | free_conf(conf); | |
1da177e4 | 5359 | mddev->private = NULL; |
0c55e022 | 5360 | printk(KERN_ALERT "md/raid:%s: failed to run raid set.\n", mdname(mddev)); |
1da177e4 LT |
5361 | return -EIO; |
5362 | } | |
5363 | ||
fd01b88c | 5364 | static int stop(struct mddev *mddev) |
1da177e4 | 5365 | { |
d1688a6d | 5366 | struct r5conf *conf = mddev->private; |
1da177e4 | 5367 | |
01f96c0a | 5368 | md_unregister_thread(&mddev->thread); |
11d8a6e3 N |
5369 | if (mddev->queue) |
5370 | mddev->queue->backing_dev_info.congested_fn = NULL; | |
95fc17aa | 5371 | free_conf(conf); |
a64c876f N |
5372 | mddev->private = NULL; |
5373 | mddev->to_remove = &raid5_attrs_group; | |
1da177e4 LT |
5374 | return 0; |
5375 | } | |
5376 | ||
fd01b88c | 5377 | static void status(struct seq_file *seq, struct mddev *mddev) |
1da177e4 | 5378 | { |
d1688a6d | 5379 | struct r5conf *conf = mddev->private; |
1da177e4 LT |
5380 | int i; |
5381 | ||
9d8f0363 AN |
5382 | seq_printf(seq, " level %d, %dk chunk, algorithm %d", mddev->level, |
5383 | mddev->chunk_sectors / 2, mddev->layout); | |
02c2de8c | 5384 | seq_printf (seq, " [%d/%d] [", conf->raid_disks, conf->raid_disks - mddev->degraded); |
1da177e4 LT |
5385 | for (i = 0; i < conf->raid_disks; i++) |
5386 | seq_printf (seq, "%s", | |
5387 | conf->disks[i].rdev && | |
b2d444d7 | 5388 | test_bit(In_sync, &conf->disks[i].rdev->flags) ? "U" : "_"); |
1da177e4 | 5389 | seq_printf (seq, "]"); |
1da177e4 LT |
5390 | } |
5391 | ||
d1688a6d | 5392 | static void print_raid5_conf (struct r5conf *conf) |
1da177e4 LT |
5393 | { |
5394 | int i; | |
5395 | struct disk_info *tmp; | |
5396 | ||
0c55e022 | 5397 | printk(KERN_DEBUG "RAID conf printout:\n"); |
1da177e4 LT |
5398 | if (!conf) { |
5399 | printk("(conf==NULL)\n"); | |
5400 | return; | |
5401 | } | |
0c55e022 N |
5402 | printk(KERN_DEBUG " --- level:%d rd:%d wd:%d\n", conf->level, |
5403 | conf->raid_disks, | |
5404 | conf->raid_disks - conf->mddev->degraded); | |
1da177e4 LT |
5405 | |
5406 | for (i = 0; i < conf->raid_disks; i++) { | |
5407 | char b[BDEVNAME_SIZE]; | |
5408 | tmp = conf->disks + i; | |
5409 | if (tmp->rdev) | |
0c55e022 N |
5410 | printk(KERN_DEBUG " disk %d, o:%d, dev:%s\n", |
5411 | i, !test_bit(Faulty, &tmp->rdev->flags), | |
5412 | bdevname(tmp->rdev->bdev, b)); | |
1da177e4 LT |
5413 | } |
5414 | } | |
5415 | ||
fd01b88c | 5416 | static int raid5_spare_active(struct mddev *mddev) |
1da177e4 LT |
5417 | { |
5418 | int i; | |
d1688a6d | 5419 | struct r5conf *conf = mddev->private; |
1da177e4 | 5420 | struct disk_info *tmp; |
6b965620 N |
5421 | int count = 0; |
5422 | unsigned long flags; | |
1da177e4 LT |
5423 | |
5424 | for (i = 0; i < conf->raid_disks; i++) { | |
5425 | tmp = conf->disks + i; | |
dd054fce N |
5426 | if (tmp->replacement |
5427 | && tmp->replacement->recovery_offset == MaxSector | |
5428 | && !test_bit(Faulty, &tmp->replacement->flags) | |
5429 | && !test_and_set_bit(In_sync, &tmp->replacement->flags)) { | |
5430 | /* Replacement has just become active. */ | |
5431 | if (!tmp->rdev | |
5432 | || !test_and_clear_bit(In_sync, &tmp->rdev->flags)) | |
5433 | count++; | |
5434 | if (tmp->rdev) { | |
5435 | /* Replaced device not technically faulty, | |
5436 | * but we need to be sure it gets removed | |
5437 | * and never re-added. | |
5438 | */ | |
5439 | set_bit(Faulty, &tmp->rdev->flags); | |
5440 | sysfs_notify_dirent_safe( | |
5441 | tmp->rdev->sysfs_state); | |
5442 | } | |
5443 | sysfs_notify_dirent_safe(tmp->replacement->sysfs_state); | |
5444 | } else if (tmp->rdev | |
70fffd0b | 5445 | && tmp->rdev->recovery_offset == MaxSector |
b2d444d7 | 5446 | && !test_bit(Faulty, &tmp->rdev->flags) |
c04be0aa | 5447 | && !test_and_set_bit(In_sync, &tmp->rdev->flags)) { |
6b965620 | 5448 | count++; |
43c73ca4 | 5449 | sysfs_notify_dirent_safe(tmp->rdev->sysfs_state); |
1da177e4 LT |
5450 | } |
5451 | } | |
6b965620 | 5452 | spin_lock_irqsave(&conf->device_lock, flags); |
908f4fbd | 5453 | mddev->degraded = calc_degraded(conf); |
6b965620 | 5454 | spin_unlock_irqrestore(&conf->device_lock, flags); |
1da177e4 | 5455 | print_raid5_conf(conf); |
6b965620 | 5456 | return count; |
1da177e4 LT |
5457 | } |
5458 | ||
b8321b68 | 5459 | static int raid5_remove_disk(struct mddev *mddev, struct md_rdev *rdev) |
1da177e4 | 5460 | { |
d1688a6d | 5461 | struct r5conf *conf = mddev->private; |
1da177e4 | 5462 | int err = 0; |
b8321b68 | 5463 | int number = rdev->raid_disk; |
657e3e4d | 5464 | struct md_rdev **rdevp; |
1da177e4 LT |
5465 | struct disk_info *p = conf->disks + number; |
5466 | ||
5467 | print_raid5_conf(conf); | |
657e3e4d N |
5468 | if (rdev == p->rdev) |
5469 | rdevp = &p->rdev; | |
5470 | else if (rdev == p->replacement) | |
5471 | rdevp = &p->replacement; | |
5472 | else | |
5473 | return 0; | |
5474 | ||
5475 | if (number >= conf->raid_disks && | |
5476 | conf->reshape_progress == MaxSector) | |
5477 | clear_bit(In_sync, &rdev->flags); | |
5478 | ||
5479 | if (test_bit(In_sync, &rdev->flags) || | |
5480 | atomic_read(&rdev->nr_pending)) { | |
5481 | err = -EBUSY; | |
5482 | goto abort; | |
5483 | } | |
5484 | /* Only remove non-faulty devices if recovery | |
5485 | * isn't possible. | |
5486 | */ | |
5487 | if (!test_bit(Faulty, &rdev->flags) && | |
5488 | mddev->recovery_disabled != conf->recovery_disabled && | |
5489 | !has_failed(conf) && | |
dd054fce | 5490 | (!p->replacement || p->replacement == rdev) && |
657e3e4d N |
5491 | number < conf->raid_disks) { |
5492 | err = -EBUSY; | |
5493 | goto abort; | |
5494 | } | |
5495 | *rdevp = NULL; | |
5496 | synchronize_rcu(); | |
5497 | if (atomic_read(&rdev->nr_pending)) { | |
5498 | /* lost the race, try later */ | |
5499 | err = -EBUSY; | |
5500 | *rdevp = rdev; | |
dd054fce N |
5501 | } else if (p->replacement) { |
5502 | /* We must have just cleared 'rdev' */ | |
5503 | p->rdev = p->replacement; | |
5504 | clear_bit(Replacement, &p->replacement->flags); | |
5505 | smp_mb(); /* Make sure other CPUs may see both as identical | |
5506 | * but will never see neither - if they are careful | |
5507 | */ | |
5508 | p->replacement = NULL; | |
5509 | clear_bit(WantReplacement, &rdev->flags); | |
5510 | } else | |
5511 | /* We might have just removed the Replacement as faulty- | |
5512 | * clear the bit just in case | |
5513 | */ | |
5514 | clear_bit(WantReplacement, &rdev->flags); | |
1da177e4 LT |
5515 | abort: |
5516 | ||
5517 | print_raid5_conf(conf); | |
5518 | return err; | |
5519 | } | |
5520 | ||
fd01b88c | 5521 | static int raid5_add_disk(struct mddev *mddev, struct md_rdev *rdev) |
1da177e4 | 5522 | { |
d1688a6d | 5523 | struct r5conf *conf = mddev->private; |
199050ea | 5524 | int err = -EEXIST; |
1da177e4 LT |
5525 | int disk; |
5526 | struct disk_info *p; | |
6c2fce2e NB |
5527 | int first = 0; |
5528 | int last = conf->raid_disks - 1; | |
1da177e4 | 5529 | |
7f0da59b N |
5530 | if (mddev->recovery_disabled == conf->recovery_disabled) |
5531 | return -EBUSY; | |
5532 | ||
dc10c643 | 5533 | if (rdev->saved_raid_disk < 0 && has_failed(conf)) |
1da177e4 | 5534 | /* no point adding a device */ |
199050ea | 5535 | return -EINVAL; |
1da177e4 | 5536 | |
6c2fce2e NB |
5537 | if (rdev->raid_disk >= 0) |
5538 | first = last = rdev->raid_disk; | |
1da177e4 LT |
5539 | |
5540 | /* | |
16a53ecc N |
5541 | * find the disk ... but prefer rdev->saved_raid_disk |
5542 | * if possible. | |
1da177e4 | 5543 | */ |
16a53ecc | 5544 | if (rdev->saved_raid_disk >= 0 && |
6c2fce2e | 5545 | rdev->saved_raid_disk >= first && |
16a53ecc | 5546 | conf->disks[rdev->saved_raid_disk].rdev == NULL) |
5cfb22a1 N |
5547 | first = rdev->saved_raid_disk; |
5548 | ||
5549 | for (disk = first; disk <= last; disk++) { | |
7bfec5f3 N |
5550 | p = conf->disks + disk; |
5551 | if (p->rdev == NULL) { | |
b2d444d7 | 5552 | clear_bit(In_sync, &rdev->flags); |
1da177e4 | 5553 | rdev->raid_disk = disk; |
199050ea | 5554 | err = 0; |
72626685 N |
5555 | if (rdev->saved_raid_disk != disk) |
5556 | conf->fullsync = 1; | |
d6065f7b | 5557 | rcu_assign_pointer(p->rdev, rdev); |
5cfb22a1 | 5558 | goto out; |
1da177e4 | 5559 | } |
5cfb22a1 N |
5560 | } |
5561 | for (disk = first; disk <= last; disk++) { | |
5562 | p = conf->disks + disk; | |
7bfec5f3 N |
5563 | if (test_bit(WantReplacement, &p->rdev->flags) && |
5564 | p->replacement == NULL) { | |
5565 | clear_bit(In_sync, &rdev->flags); | |
5566 | set_bit(Replacement, &rdev->flags); | |
5567 | rdev->raid_disk = disk; | |
5568 | err = 0; | |
5569 | conf->fullsync = 1; | |
5570 | rcu_assign_pointer(p->replacement, rdev); | |
5571 | break; | |
5572 | } | |
5573 | } | |
5cfb22a1 | 5574 | out: |
1da177e4 | 5575 | print_raid5_conf(conf); |
199050ea | 5576 | return err; |
1da177e4 LT |
5577 | } |
5578 | ||
fd01b88c | 5579 | static int raid5_resize(struct mddev *mddev, sector_t sectors) |
1da177e4 LT |
5580 | { |
5581 | /* no resync is happening, and there is enough space | |
5582 | * on all devices, so we can resize. | |
5583 | * We need to make sure resync covers any new space. | |
5584 | * If the array is shrinking we should possibly wait until | |
5585 | * any io in the removed space completes, but it hardly seems | |
5586 | * worth it. | |
5587 | */ | |
a4a6125a | 5588 | sector_t newsize; |
9d8f0363 | 5589 | sectors &= ~((sector_t)mddev->chunk_sectors - 1); |
a4a6125a N |
5590 | newsize = raid5_size(mddev, sectors, mddev->raid_disks); |
5591 | if (mddev->external_size && | |
5592 | mddev->array_sectors > newsize) | |
b522adcd | 5593 | return -EINVAL; |
a4a6125a N |
5594 | if (mddev->bitmap) { |
5595 | int ret = bitmap_resize(mddev->bitmap, sectors, 0, 0); | |
5596 | if (ret) | |
5597 | return ret; | |
5598 | } | |
5599 | md_set_array_sectors(mddev, newsize); | |
f233ea5c | 5600 | set_capacity(mddev->gendisk, mddev->array_sectors); |
449aad3e | 5601 | revalidate_disk(mddev->gendisk); |
b098636c N |
5602 | if (sectors > mddev->dev_sectors && |
5603 | mddev->recovery_cp > mddev->dev_sectors) { | |
58c0fed4 | 5604 | mddev->recovery_cp = mddev->dev_sectors; |
1da177e4 LT |
5605 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
5606 | } | |
58c0fed4 | 5607 | mddev->dev_sectors = sectors; |
4b5c7ae8 | 5608 | mddev->resync_max_sectors = sectors; |
1da177e4 LT |
5609 | return 0; |
5610 | } | |
5611 | ||
fd01b88c | 5612 | static int check_stripe_cache(struct mddev *mddev) |
01ee22b4 N |
5613 | { |
5614 | /* Can only proceed if there are plenty of stripe_heads. | |
5615 | * We need a minimum of one full stripe,, and for sensible progress | |
5616 | * it is best to have about 4 times that. | |
5617 | * If we require 4 times, then the default 256 4K stripe_heads will | |
5618 | * allow for chunk sizes up to 256K, which is probably OK. | |
5619 | * If the chunk size is greater, user-space should request more | |
5620 | * stripe_heads first. | |
5621 | */ | |
d1688a6d | 5622 | struct r5conf *conf = mddev->private; |
01ee22b4 N |
5623 | if (((mddev->chunk_sectors << 9) / STRIPE_SIZE) * 4 |
5624 | > conf->max_nr_stripes || | |
5625 | ((mddev->new_chunk_sectors << 9) / STRIPE_SIZE) * 4 | |
5626 | > conf->max_nr_stripes) { | |
0c55e022 N |
5627 | printk(KERN_WARNING "md/raid:%s: reshape: not enough stripes. Needed %lu\n", |
5628 | mdname(mddev), | |
01ee22b4 N |
5629 | ((max(mddev->chunk_sectors, mddev->new_chunk_sectors) << 9) |
5630 | / STRIPE_SIZE)*4); | |
5631 | return 0; | |
5632 | } | |
5633 | return 1; | |
5634 | } | |
5635 | ||
fd01b88c | 5636 | static int check_reshape(struct mddev *mddev) |
29269553 | 5637 | { |
d1688a6d | 5638 | struct r5conf *conf = mddev->private; |
29269553 | 5639 | |
88ce4930 N |
5640 | if (mddev->delta_disks == 0 && |
5641 | mddev->new_layout == mddev->layout && | |
664e7c41 | 5642 | mddev->new_chunk_sectors == mddev->chunk_sectors) |
50ac168a | 5643 | return 0; /* nothing to do */ |
674806d6 | 5644 | if (has_failed(conf)) |
ec32a2bd N |
5645 | return -EINVAL; |
5646 | if (mddev->delta_disks < 0) { | |
5647 | /* We might be able to shrink, but the devices must | |
5648 | * be made bigger first. | |
5649 | * For raid6, 4 is the minimum size. | |
5650 | * Otherwise 2 is the minimum | |
5651 | */ | |
5652 | int min = 2; | |
5653 | if (mddev->level == 6) | |
5654 | min = 4; | |
5655 | if (mddev->raid_disks + mddev->delta_disks < min) | |
5656 | return -EINVAL; | |
5657 | } | |
29269553 | 5658 | |
01ee22b4 | 5659 | if (!check_stripe_cache(mddev)) |
29269553 | 5660 | return -ENOSPC; |
29269553 | 5661 | |
ec32a2bd | 5662 | return resize_stripes(conf, conf->raid_disks + mddev->delta_disks); |
63c70c4f N |
5663 | } |
5664 | ||
fd01b88c | 5665 | static int raid5_start_reshape(struct mddev *mddev) |
63c70c4f | 5666 | { |
d1688a6d | 5667 | struct r5conf *conf = mddev->private; |
3cb03002 | 5668 | struct md_rdev *rdev; |
63c70c4f | 5669 | int spares = 0; |
c04be0aa | 5670 | unsigned long flags; |
63c70c4f | 5671 | |
f416885e | 5672 | if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) |
63c70c4f N |
5673 | return -EBUSY; |
5674 | ||
01ee22b4 N |
5675 | if (!check_stripe_cache(mddev)) |
5676 | return -ENOSPC; | |
5677 | ||
30b67645 N |
5678 | if (has_failed(conf)) |
5679 | return -EINVAL; | |
5680 | ||
c6563a8c | 5681 | rdev_for_each(rdev, mddev) { |
469518a3 N |
5682 | if (!test_bit(In_sync, &rdev->flags) |
5683 | && !test_bit(Faulty, &rdev->flags)) | |
29269553 | 5684 | spares++; |
c6563a8c | 5685 | } |
63c70c4f | 5686 | |
f416885e | 5687 | if (spares - mddev->degraded < mddev->delta_disks - conf->max_degraded) |
29269553 N |
5688 | /* Not enough devices even to make a degraded array |
5689 | * of that size | |
5690 | */ | |
5691 | return -EINVAL; | |
5692 | ||
ec32a2bd N |
5693 | /* Refuse to reduce size of the array. Any reductions in |
5694 | * array size must be through explicit setting of array_size | |
5695 | * attribute. | |
5696 | */ | |
5697 | if (raid5_size(mddev, 0, conf->raid_disks + mddev->delta_disks) | |
5698 | < mddev->array_sectors) { | |
0c55e022 | 5699 | printk(KERN_ERR "md/raid:%s: array size must be reduced " |
ec32a2bd N |
5700 | "before number of disks\n", mdname(mddev)); |
5701 | return -EINVAL; | |
5702 | } | |
5703 | ||
f6705578 | 5704 | atomic_set(&conf->reshape_stripes, 0); |
29269553 N |
5705 | spin_lock_irq(&conf->device_lock); |
5706 | conf->previous_raid_disks = conf->raid_disks; | |
63c70c4f | 5707 | conf->raid_disks += mddev->delta_disks; |
09c9e5fa AN |
5708 | conf->prev_chunk_sectors = conf->chunk_sectors; |
5709 | conf->chunk_sectors = mddev->new_chunk_sectors; | |
88ce4930 N |
5710 | conf->prev_algo = conf->algorithm; |
5711 | conf->algorithm = mddev->new_layout; | |
05616be5 N |
5712 | conf->generation++; |
5713 | /* Code that selects data_offset needs to see the generation update | |
5714 | * if reshape_progress has been set - so a memory barrier needed. | |
5715 | */ | |
5716 | smp_mb(); | |
2c810cdd | 5717 | if (mddev->reshape_backwards) |
fef9c61f N |
5718 | conf->reshape_progress = raid5_size(mddev, 0, 0); |
5719 | else | |
5720 | conf->reshape_progress = 0; | |
5721 | conf->reshape_safe = conf->reshape_progress; | |
29269553 N |
5722 | spin_unlock_irq(&conf->device_lock); |
5723 | ||
5724 | /* Add some new drives, as many as will fit. | |
5725 | * We know there are enough to make the newly sized array work. | |
3424bf6a N |
5726 | * Don't add devices if we are reducing the number of |
5727 | * devices in the array. This is because it is not possible | |
5728 | * to correctly record the "partially reconstructed" state of | |
5729 | * such devices during the reshape and confusion could result. | |
29269553 | 5730 | */ |
87a8dec9 | 5731 | if (mddev->delta_disks >= 0) { |
dafb20fa | 5732 | rdev_for_each(rdev, mddev) |
87a8dec9 N |
5733 | if (rdev->raid_disk < 0 && |
5734 | !test_bit(Faulty, &rdev->flags)) { | |
5735 | if (raid5_add_disk(mddev, rdev) == 0) { | |
87a8dec9 | 5736 | if (rdev->raid_disk |
9d4c7d87 | 5737 | >= conf->previous_raid_disks) |
87a8dec9 | 5738 | set_bit(In_sync, &rdev->flags); |
9d4c7d87 | 5739 | else |
87a8dec9 | 5740 | rdev->recovery_offset = 0; |
36fad858 NK |
5741 | |
5742 | if (sysfs_link_rdev(mddev, rdev)) | |
87a8dec9 | 5743 | /* Failure here is OK */; |
50da0840 | 5744 | } |
87a8dec9 N |
5745 | } else if (rdev->raid_disk >= conf->previous_raid_disks |
5746 | && !test_bit(Faulty, &rdev->flags)) { | |
5747 | /* This is a spare that was manually added */ | |
5748 | set_bit(In_sync, &rdev->flags); | |
87a8dec9 | 5749 | } |
29269553 | 5750 | |
87a8dec9 N |
5751 | /* When a reshape changes the number of devices, |
5752 | * ->degraded is measured against the larger of the | |
5753 | * pre and post number of devices. | |
5754 | */ | |
ec32a2bd | 5755 | spin_lock_irqsave(&conf->device_lock, flags); |
908f4fbd | 5756 | mddev->degraded = calc_degraded(conf); |
ec32a2bd N |
5757 | spin_unlock_irqrestore(&conf->device_lock, flags); |
5758 | } | |
63c70c4f | 5759 | mddev->raid_disks = conf->raid_disks; |
e516402c | 5760 | mddev->reshape_position = conf->reshape_progress; |
850b2b42 | 5761 | set_bit(MD_CHANGE_DEVS, &mddev->flags); |
f6705578 | 5762 | |
29269553 N |
5763 | clear_bit(MD_RECOVERY_SYNC, &mddev->recovery); |
5764 | clear_bit(MD_RECOVERY_CHECK, &mddev->recovery); | |
5765 | set_bit(MD_RECOVERY_RESHAPE, &mddev->recovery); | |
5766 | set_bit(MD_RECOVERY_RUNNING, &mddev->recovery); | |
5767 | mddev->sync_thread = md_register_thread(md_do_sync, mddev, | |
0da3c619 | 5768 | "reshape"); |
29269553 N |
5769 | if (!mddev->sync_thread) { |
5770 | mddev->recovery = 0; | |
5771 | spin_lock_irq(&conf->device_lock); | |
5772 | mddev->raid_disks = conf->raid_disks = conf->previous_raid_disks; | |
05616be5 N |
5773 | rdev_for_each(rdev, mddev) |
5774 | rdev->new_data_offset = rdev->data_offset; | |
5775 | smp_wmb(); | |
fef9c61f | 5776 | conf->reshape_progress = MaxSector; |
1e3fa9bd | 5777 | mddev->reshape_position = MaxSector; |
29269553 N |
5778 | spin_unlock_irq(&conf->device_lock); |
5779 | return -EAGAIN; | |
5780 | } | |
c8f517c4 | 5781 | conf->reshape_checkpoint = jiffies; |
29269553 N |
5782 | md_wakeup_thread(mddev->sync_thread); |
5783 | md_new_event(mddev); | |
5784 | return 0; | |
5785 | } | |
29269553 | 5786 | |
ec32a2bd N |
5787 | /* This is called from the reshape thread and should make any |
5788 | * changes needed in 'conf' | |
5789 | */ | |
d1688a6d | 5790 | static void end_reshape(struct r5conf *conf) |
29269553 | 5791 | { |
29269553 | 5792 | |
f6705578 | 5793 | if (!test_bit(MD_RECOVERY_INTR, &conf->mddev->recovery)) { |
05616be5 | 5794 | struct md_rdev *rdev; |
f6705578 | 5795 | |
f6705578 | 5796 | spin_lock_irq(&conf->device_lock); |
cea9c228 | 5797 | conf->previous_raid_disks = conf->raid_disks; |
05616be5 N |
5798 | rdev_for_each(rdev, conf->mddev) |
5799 | rdev->data_offset = rdev->new_data_offset; | |
5800 | smp_wmb(); | |
fef9c61f | 5801 | conf->reshape_progress = MaxSector; |
f6705578 | 5802 | spin_unlock_irq(&conf->device_lock); |
b0f9ec04 | 5803 | wake_up(&conf->wait_for_overlap); |
16a53ecc N |
5804 | |
5805 | /* read-ahead size must cover two whole stripes, which is | |
5806 | * 2 * (datadisks) * chunksize where 'n' is the number of raid devices | |
5807 | */ | |
4a5add49 | 5808 | if (conf->mddev->queue) { |
cea9c228 | 5809 | int data_disks = conf->raid_disks - conf->max_degraded; |
09c9e5fa | 5810 | int stripe = data_disks * ((conf->chunk_sectors << 9) |
cea9c228 | 5811 | / PAGE_SIZE); |
16a53ecc N |
5812 | if (conf->mddev->queue->backing_dev_info.ra_pages < 2 * stripe) |
5813 | conf->mddev->queue->backing_dev_info.ra_pages = 2 * stripe; | |
5814 | } | |
29269553 | 5815 | } |
29269553 N |
5816 | } |
5817 | ||
ec32a2bd N |
5818 | /* This is called from the raid5d thread with mddev_lock held. |
5819 | * It makes config changes to the device. | |
5820 | */ | |
fd01b88c | 5821 | static void raid5_finish_reshape(struct mddev *mddev) |
cea9c228 | 5822 | { |
d1688a6d | 5823 | struct r5conf *conf = mddev->private; |
cea9c228 N |
5824 | |
5825 | if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery)) { | |
5826 | ||
ec32a2bd N |
5827 | if (mddev->delta_disks > 0) { |
5828 | md_set_array_sectors(mddev, raid5_size(mddev, 0, 0)); | |
5829 | set_capacity(mddev->gendisk, mddev->array_sectors); | |
449aad3e | 5830 | revalidate_disk(mddev->gendisk); |
ec32a2bd N |
5831 | } else { |
5832 | int d; | |
908f4fbd N |
5833 | spin_lock_irq(&conf->device_lock); |
5834 | mddev->degraded = calc_degraded(conf); | |
5835 | spin_unlock_irq(&conf->device_lock); | |
ec32a2bd N |
5836 | for (d = conf->raid_disks ; |
5837 | d < conf->raid_disks - mddev->delta_disks; | |
1a67dde0 | 5838 | d++) { |
3cb03002 | 5839 | struct md_rdev *rdev = conf->disks[d].rdev; |
da7613b8 N |
5840 | if (rdev) |
5841 | clear_bit(In_sync, &rdev->flags); | |
5842 | rdev = conf->disks[d].replacement; | |
5843 | if (rdev) | |
5844 | clear_bit(In_sync, &rdev->flags); | |
1a67dde0 | 5845 | } |
cea9c228 | 5846 | } |
88ce4930 | 5847 | mddev->layout = conf->algorithm; |
09c9e5fa | 5848 | mddev->chunk_sectors = conf->chunk_sectors; |
ec32a2bd N |
5849 | mddev->reshape_position = MaxSector; |
5850 | mddev->delta_disks = 0; | |
2c810cdd | 5851 | mddev->reshape_backwards = 0; |
cea9c228 N |
5852 | } |
5853 | } | |
5854 | ||
fd01b88c | 5855 | static void raid5_quiesce(struct mddev *mddev, int state) |
72626685 | 5856 | { |
d1688a6d | 5857 | struct r5conf *conf = mddev->private; |
72626685 N |
5858 | |
5859 | switch(state) { | |
e464eafd N |
5860 | case 2: /* resume for a suspend */ |
5861 | wake_up(&conf->wait_for_overlap); | |
5862 | break; | |
5863 | ||
72626685 N |
5864 | case 1: /* stop all writes */ |
5865 | spin_lock_irq(&conf->device_lock); | |
64bd660b N |
5866 | /* '2' tells resync/reshape to pause so that all |
5867 | * active stripes can drain | |
5868 | */ | |
5869 | conf->quiesce = 2; | |
72626685 | 5870 | wait_event_lock_irq(conf->wait_for_stripe, |
46031f9a RBJ |
5871 | atomic_read(&conf->active_stripes) == 0 && |
5872 | atomic_read(&conf->active_aligned_reads) == 0, | |
72626685 | 5873 | conf->device_lock, /* nothing */); |
64bd660b | 5874 | conf->quiesce = 1; |
72626685 | 5875 | spin_unlock_irq(&conf->device_lock); |
64bd660b N |
5876 | /* allow reshape to continue */ |
5877 | wake_up(&conf->wait_for_overlap); | |
72626685 N |
5878 | break; |
5879 | ||
5880 | case 0: /* re-enable writes */ | |
5881 | spin_lock_irq(&conf->device_lock); | |
5882 | conf->quiesce = 0; | |
5883 | wake_up(&conf->wait_for_stripe); | |
e464eafd | 5884 | wake_up(&conf->wait_for_overlap); |
72626685 N |
5885 | spin_unlock_irq(&conf->device_lock); |
5886 | break; | |
5887 | } | |
72626685 | 5888 | } |
b15c2e57 | 5889 | |
d562b0c4 | 5890 | |
fd01b88c | 5891 | static void *raid45_takeover_raid0(struct mddev *mddev, int level) |
54071b38 | 5892 | { |
e373ab10 | 5893 | struct r0conf *raid0_conf = mddev->private; |
d76c8420 | 5894 | sector_t sectors; |
54071b38 | 5895 | |
f1b29bca | 5896 | /* for raid0 takeover only one zone is supported */ |
e373ab10 | 5897 | if (raid0_conf->nr_strip_zones > 1) { |
0c55e022 N |
5898 | printk(KERN_ERR "md/raid:%s: cannot takeover raid0 with more than one zone.\n", |
5899 | mdname(mddev)); | |
f1b29bca DW |
5900 | return ERR_PTR(-EINVAL); |
5901 | } | |
5902 | ||
e373ab10 N |
5903 | sectors = raid0_conf->strip_zone[0].zone_end; |
5904 | sector_div(sectors, raid0_conf->strip_zone[0].nb_dev); | |
3b71bd93 | 5905 | mddev->dev_sectors = sectors; |
f1b29bca | 5906 | mddev->new_level = level; |
54071b38 TM |
5907 | mddev->new_layout = ALGORITHM_PARITY_N; |
5908 | mddev->new_chunk_sectors = mddev->chunk_sectors; | |
5909 | mddev->raid_disks += 1; | |
5910 | mddev->delta_disks = 1; | |
5911 | /* make sure it will be not marked as dirty */ | |
5912 | mddev->recovery_cp = MaxSector; | |
5913 | ||
5914 | return setup_conf(mddev); | |
5915 | } | |
5916 | ||
5917 | ||
fd01b88c | 5918 | static void *raid5_takeover_raid1(struct mddev *mddev) |
d562b0c4 N |
5919 | { |
5920 | int chunksect; | |
5921 | ||
5922 | if (mddev->raid_disks != 2 || | |
5923 | mddev->degraded > 1) | |
5924 | return ERR_PTR(-EINVAL); | |
5925 | ||
5926 | /* Should check if there are write-behind devices? */ | |
5927 | ||
5928 | chunksect = 64*2; /* 64K by default */ | |
5929 | ||
5930 | /* The array must be an exact multiple of chunksize */ | |
5931 | while (chunksect && (mddev->array_sectors & (chunksect-1))) | |
5932 | chunksect >>= 1; | |
5933 | ||
5934 | if ((chunksect<<9) < STRIPE_SIZE) | |
5935 | /* array size does not allow a suitable chunk size */ | |
5936 | return ERR_PTR(-EINVAL); | |
5937 | ||
5938 | mddev->new_level = 5; | |
5939 | mddev->new_layout = ALGORITHM_LEFT_SYMMETRIC; | |
664e7c41 | 5940 | mddev->new_chunk_sectors = chunksect; |
d562b0c4 N |
5941 | |
5942 | return setup_conf(mddev); | |
5943 | } | |
5944 | ||
fd01b88c | 5945 | static void *raid5_takeover_raid6(struct mddev *mddev) |
fc9739c6 N |
5946 | { |
5947 | int new_layout; | |
5948 | ||
5949 | switch (mddev->layout) { | |
5950 | case ALGORITHM_LEFT_ASYMMETRIC_6: | |
5951 | new_layout = ALGORITHM_LEFT_ASYMMETRIC; | |
5952 | break; | |
5953 | case ALGORITHM_RIGHT_ASYMMETRIC_6: | |
5954 | new_layout = ALGORITHM_RIGHT_ASYMMETRIC; | |
5955 | break; | |
5956 | case ALGORITHM_LEFT_SYMMETRIC_6: | |
5957 | new_layout = ALGORITHM_LEFT_SYMMETRIC; | |
5958 | break; | |
5959 | case ALGORITHM_RIGHT_SYMMETRIC_6: | |
5960 | new_layout = ALGORITHM_RIGHT_SYMMETRIC; | |
5961 | break; | |
5962 | case ALGORITHM_PARITY_0_6: | |
5963 | new_layout = ALGORITHM_PARITY_0; | |
5964 | break; | |
5965 | case ALGORITHM_PARITY_N: | |
5966 | new_layout = ALGORITHM_PARITY_N; | |
5967 | break; | |
5968 | default: | |
5969 | return ERR_PTR(-EINVAL); | |
5970 | } | |
5971 | mddev->new_level = 5; | |
5972 | mddev->new_layout = new_layout; | |
5973 | mddev->delta_disks = -1; | |
5974 | mddev->raid_disks -= 1; | |
5975 | return setup_conf(mddev); | |
5976 | } | |
5977 | ||
d562b0c4 | 5978 | |
fd01b88c | 5979 | static int raid5_check_reshape(struct mddev *mddev) |
b3546035 | 5980 | { |
88ce4930 N |
5981 | /* For a 2-drive array, the layout and chunk size can be changed |
5982 | * immediately as not restriping is needed. | |
5983 | * For larger arrays we record the new value - after validation | |
5984 | * to be used by a reshape pass. | |
b3546035 | 5985 | */ |
d1688a6d | 5986 | struct r5conf *conf = mddev->private; |
597a711b | 5987 | int new_chunk = mddev->new_chunk_sectors; |
b3546035 | 5988 | |
597a711b | 5989 | if (mddev->new_layout >= 0 && !algorithm_valid_raid5(mddev->new_layout)) |
b3546035 N |
5990 | return -EINVAL; |
5991 | if (new_chunk > 0) { | |
0ba459d2 | 5992 | if (!is_power_of_2(new_chunk)) |
b3546035 | 5993 | return -EINVAL; |
597a711b | 5994 | if (new_chunk < (PAGE_SIZE>>9)) |
b3546035 | 5995 | return -EINVAL; |
597a711b | 5996 | if (mddev->array_sectors & (new_chunk-1)) |
b3546035 N |
5997 | /* not factor of array size */ |
5998 | return -EINVAL; | |
5999 | } | |
6000 | ||
6001 | /* They look valid */ | |
6002 | ||
88ce4930 | 6003 | if (mddev->raid_disks == 2) { |
597a711b N |
6004 | /* can make the change immediately */ |
6005 | if (mddev->new_layout >= 0) { | |
6006 | conf->algorithm = mddev->new_layout; | |
6007 | mddev->layout = mddev->new_layout; | |
88ce4930 N |
6008 | } |
6009 | if (new_chunk > 0) { | |
597a711b N |
6010 | conf->chunk_sectors = new_chunk ; |
6011 | mddev->chunk_sectors = new_chunk; | |
88ce4930 N |
6012 | } |
6013 | set_bit(MD_CHANGE_DEVS, &mddev->flags); | |
6014 | md_wakeup_thread(mddev->thread); | |
b3546035 | 6015 | } |
50ac168a | 6016 | return check_reshape(mddev); |
88ce4930 N |
6017 | } |
6018 | ||
fd01b88c | 6019 | static int raid6_check_reshape(struct mddev *mddev) |
88ce4930 | 6020 | { |
597a711b | 6021 | int new_chunk = mddev->new_chunk_sectors; |
50ac168a | 6022 | |
597a711b | 6023 | if (mddev->new_layout >= 0 && !algorithm_valid_raid6(mddev->new_layout)) |
88ce4930 | 6024 | return -EINVAL; |
b3546035 | 6025 | if (new_chunk > 0) { |
0ba459d2 | 6026 | if (!is_power_of_2(new_chunk)) |
88ce4930 | 6027 | return -EINVAL; |
597a711b | 6028 | if (new_chunk < (PAGE_SIZE >> 9)) |
88ce4930 | 6029 | return -EINVAL; |
597a711b | 6030 | if (mddev->array_sectors & (new_chunk-1)) |
88ce4930 N |
6031 | /* not factor of array size */ |
6032 | return -EINVAL; | |
b3546035 | 6033 | } |
88ce4930 N |
6034 | |
6035 | /* They look valid */ | |
50ac168a | 6036 | return check_reshape(mddev); |
b3546035 N |
6037 | } |
6038 | ||
fd01b88c | 6039 | static void *raid5_takeover(struct mddev *mddev) |
d562b0c4 N |
6040 | { |
6041 | /* raid5 can take over: | |
f1b29bca | 6042 | * raid0 - if there is only one strip zone - make it a raid4 layout |
d562b0c4 N |
6043 | * raid1 - if there are two drives. We need to know the chunk size |
6044 | * raid4 - trivial - just use a raid4 layout. | |
6045 | * raid6 - Providing it is a *_6 layout | |
d562b0c4 | 6046 | */ |
f1b29bca DW |
6047 | if (mddev->level == 0) |
6048 | return raid45_takeover_raid0(mddev, 5); | |
d562b0c4 N |
6049 | if (mddev->level == 1) |
6050 | return raid5_takeover_raid1(mddev); | |
e9d4758f N |
6051 | if (mddev->level == 4) { |
6052 | mddev->new_layout = ALGORITHM_PARITY_N; | |
6053 | mddev->new_level = 5; | |
6054 | return setup_conf(mddev); | |
6055 | } | |
fc9739c6 N |
6056 | if (mddev->level == 6) |
6057 | return raid5_takeover_raid6(mddev); | |
d562b0c4 N |
6058 | |
6059 | return ERR_PTR(-EINVAL); | |
6060 | } | |
6061 | ||
fd01b88c | 6062 | static void *raid4_takeover(struct mddev *mddev) |
a78d38a1 | 6063 | { |
f1b29bca DW |
6064 | /* raid4 can take over: |
6065 | * raid0 - if there is only one strip zone | |
6066 | * raid5 - if layout is right | |
a78d38a1 | 6067 | */ |
f1b29bca DW |
6068 | if (mddev->level == 0) |
6069 | return raid45_takeover_raid0(mddev, 4); | |
a78d38a1 N |
6070 | if (mddev->level == 5 && |
6071 | mddev->layout == ALGORITHM_PARITY_N) { | |
6072 | mddev->new_layout = 0; | |
6073 | mddev->new_level = 4; | |
6074 | return setup_conf(mddev); | |
6075 | } | |
6076 | return ERR_PTR(-EINVAL); | |
6077 | } | |
d562b0c4 | 6078 | |
84fc4b56 | 6079 | static struct md_personality raid5_personality; |
245f46c2 | 6080 | |
fd01b88c | 6081 | static void *raid6_takeover(struct mddev *mddev) |
245f46c2 N |
6082 | { |
6083 | /* Currently can only take over a raid5. We map the | |
6084 | * personality to an equivalent raid6 personality | |
6085 | * with the Q block at the end. | |
6086 | */ | |
6087 | int new_layout; | |
6088 | ||
6089 | if (mddev->pers != &raid5_personality) | |
6090 | return ERR_PTR(-EINVAL); | |
6091 | if (mddev->degraded > 1) | |
6092 | return ERR_PTR(-EINVAL); | |
6093 | if (mddev->raid_disks > 253) | |
6094 | return ERR_PTR(-EINVAL); | |
6095 | if (mddev->raid_disks < 3) | |
6096 | return ERR_PTR(-EINVAL); | |
6097 | ||
6098 | switch (mddev->layout) { | |
6099 | case ALGORITHM_LEFT_ASYMMETRIC: | |
6100 | new_layout = ALGORITHM_LEFT_ASYMMETRIC_6; | |
6101 | break; | |
6102 | case ALGORITHM_RIGHT_ASYMMETRIC: | |
6103 | new_layout = ALGORITHM_RIGHT_ASYMMETRIC_6; | |
6104 | break; | |
6105 | case ALGORITHM_LEFT_SYMMETRIC: | |
6106 | new_layout = ALGORITHM_LEFT_SYMMETRIC_6; | |
6107 | break; | |
6108 | case ALGORITHM_RIGHT_SYMMETRIC: | |
6109 | new_layout = ALGORITHM_RIGHT_SYMMETRIC_6; | |
6110 | break; | |
6111 | case ALGORITHM_PARITY_0: | |
6112 | new_layout = ALGORITHM_PARITY_0_6; | |
6113 | break; | |
6114 | case ALGORITHM_PARITY_N: | |
6115 | new_layout = ALGORITHM_PARITY_N; | |
6116 | break; | |
6117 | default: | |
6118 | return ERR_PTR(-EINVAL); | |
6119 | } | |
6120 | mddev->new_level = 6; | |
6121 | mddev->new_layout = new_layout; | |
6122 | mddev->delta_disks = 1; | |
6123 | mddev->raid_disks += 1; | |
6124 | return setup_conf(mddev); | |
6125 | } | |
6126 | ||
6127 | ||
84fc4b56 | 6128 | static struct md_personality raid6_personality = |
16a53ecc N |
6129 | { |
6130 | .name = "raid6", | |
6131 | .level = 6, | |
6132 | .owner = THIS_MODULE, | |
6133 | .make_request = make_request, | |
6134 | .run = run, | |
6135 | .stop = stop, | |
6136 | .status = status, | |
6137 | .error_handler = error, | |
6138 | .hot_add_disk = raid5_add_disk, | |
6139 | .hot_remove_disk= raid5_remove_disk, | |
6140 | .spare_active = raid5_spare_active, | |
6141 | .sync_request = sync_request, | |
6142 | .resize = raid5_resize, | |
80c3a6ce | 6143 | .size = raid5_size, |
50ac168a | 6144 | .check_reshape = raid6_check_reshape, |
f416885e | 6145 | .start_reshape = raid5_start_reshape, |
cea9c228 | 6146 | .finish_reshape = raid5_finish_reshape, |
16a53ecc | 6147 | .quiesce = raid5_quiesce, |
245f46c2 | 6148 | .takeover = raid6_takeover, |
16a53ecc | 6149 | }; |
84fc4b56 | 6150 | static struct md_personality raid5_personality = |
1da177e4 LT |
6151 | { |
6152 | .name = "raid5", | |
2604b703 | 6153 | .level = 5, |
1da177e4 LT |
6154 | .owner = THIS_MODULE, |
6155 | .make_request = make_request, | |
6156 | .run = run, | |
6157 | .stop = stop, | |
6158 | .status = status, | |
6159 | .error_handler = error, | |
6160 | .hot_add_disk = raid5_add_disk, | |
6161 | .hot_remove_disk= raid5_remove_disk, | |
6162 | .spare_active = raid5_spare_active, | |
6163 | .sync_request = sync_request, | |
6164 | .resize = raid5_resize, | |
80c3a6ce | 6165 | .size = raid5_size, |
63c70c4f N |
6166 | .check_reshape = raid5_check_reshape, |
6167 | .start_reshape = raid5_start_reshape, | |
cea9c228 | 6168 | .finish_reshape = raid5_finish_reshape, |
72626685 | 6169 | .quiesce = raid5_quiesce, |
d562b0c4 | 6170 | .takeover = raid5_takeover, |
1da177e4 LT |
6171 | }; |
6172 | ||
84fc4b56 | 6173 | static struct md_personality raid4_personality = |
1da177e4 | 6174 | { |
2604b703 N |
6175 | .name = "raid4", |
6176 | .level = 4, | |
6177 | .owner = THIS_MODULE, | |
6178 | .make_request = make_request, | |
6179 | .run = run, | |
6180 | .stop = stop, | |
6181 | .status = status, | |
6182 | .error_handler = error, | |
6183 | .hot_add_disk = raid5_add_disk, | |
6184 | .hot_remove_disk= raid5_remove_disk, | |
6185 | .spare_active = raid5_spare_active, | |
6186 | .sync_request = sync_request, | |
6187 | .resize = raid5_resize, | |
80c3a6ce | 6188 | .size = raid5_size, |
3d37890b N |
6189 | .check_reshape = raid5_check_reshape, |
6190 | .start_reshape = raid5_start_reshape, | |
cea9c228 | 6191 | .finish_reshape = raid5_finish_reshape, |
2604b703 | 6192 | .quiesce = raid5_quiesce, |
a78d38a1 | 6193 | .takeover = raid4_takeover, |
2604b703 N |
6194 | }; |
6195 | ||
6196 | static int __init raid5_init(void) | |
6197 | { | |
16a53ecc | 6198 | register_md_personality(&raid6_personality); |
2604b703 N |
6199 | register_md_personality(&raid5_personality); |
6200 | register_md_personality(&raid4_personality); | |
6201 | return 0; | |
1da177e4 LT |
6202 | } |
6203 | ||
2604b703 | 6204 | static void raid5_exit(void) |
1da177e4 | 6205 | { |
16a53ecc | 6206 | unregister_md_personality(&raid6_personality); |
2604b703 N |
6207 | unregister_md_personality(&raid5_personality); |
6208 | unregister_md_personality(&raid4_personality); | |
1da177e4 LT |
6209 | } |
6210 | ||
6211 | module_init(raid5_init); | |
6212 | module_exit(raid5_exit); | |
6213 | MODULE_LICENSE("GPL"); | |
0efb9e61 | 6214 | MODULE_DESCRIPTION("RAID4/5/6 (striping with parity) personality for MD"); |
1da177e4 | 6215 | MODULE_ALIAS("md-personality-4"); /* RAID5 */ |
d9d166c2 N |
6216 | MODULE_ALIAS("md-raid5"); |
6217 | MODULE_ALIAS("md-raid4"); | |
2604b703 N |
6218 | MODULE_ALIAS("md-level-5"); |
6219 | MODULE_ALIAS("md-level-4"); | |
16a53ecc N |
6220 | MODULE_ALIAS("md-personality-8"); /* RAID6 */ |
6221 | MODULE_ALIAS("md-raid6"); | |
6222 | MODULE_ALIAS("md-level-6"); | |
6223 | ||
6224 | /* This used to be two separate modules, they were: */ | |
6225 | MODULE_ALIAS("raid5"); | |
6226 | MODULE_ALIAS("raid6"); |