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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. | |
30 | * conf->bm_write is the number of the last batch successfully written. | |
31 | * conf->bm_flush is the number of the last batch that was closed to | |
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 | |
35 | * the number of the batch it will be in. This is bm_flush+1. | |
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> |
bff61975 | 50 | #include <linux/seq_file.h> |
36d1c647 | 51 | #include <linux/cpu.h> |
43b2e5d8 | 52 | #include "md.h" |
bff61975 | 53 | #include "raid5.h" |
ef740c37 | 54 | #include "bitmap.h" |
72626685 | 55 | |
1da177e4 LT |
56 | /* |
57 | * Stripe cache | |
58 | */ | |
59 | ||
60 | #define NR_STRIPES 256 | |
61 | #define STRIPE_SIZE PAGE_SIZE | |
62 | #define STRIPE_SHIFT (PAGE_SHIFT - 9) | |
63 | #define STRIPE_SECTORS (STRIPE_SIZE>>9) | |
64 | #define IO_THRESHOLD 1 | |
8b3e6cdc | 65 | #define BYPASS_THRESHOLD 1 |
fccddba0 | 66 | #define NR_HASH (PAGE_SIZE / sizeof(struct hlist_head)) |
1da177e4 LT |
67 | #define HASH_MASK (NR_HASH - 1) |
68 | ||
fccddba0 | 69 | #define stripe_hash(conf, sect) (&((conf)->stripe_hashtbl[((sect) >> STRIPE_SHIFT) & HASH_MASK])) |
1da177e4 LT |
70 | |
71 | /* bio's attached to a stripe+device for I/O are linked together in bi_sector | |
72 | * order without overlap. There may be several bio's per stripe+device, and | |
73 | * a bio could span several devices. | |
74 | * When walking this list for a particular stripe+device, we must never proceed | |
75 | * beyond a bio that extends past this device, as the next bio might no longer | |
76 | * be valid. | |
77 | * This macro is used to determine the 'next' bio in the list, given the sector | |
78 | * of the current stripe+device | |
79 | */ | |
80 | #define r5_next_bio(bio, sect) ( ( (bio)->bi_sector + ((bio)->bi_size>>9) < sect + STRIPE_SECTORS) ? (bio)->bi_next : NULL) | |
81 | /* | |
82 | * The following can be used to debug the driver | |
83 | */ | |
1da177e4 LT |
84 | #define RAID5_PARANOIA 1 |
85 | #if RAID5_PARANOIA && defined(CONFIG_SMP) | |
86 | # define CHECK_DEVLOCK() assert_spin_locked(&conf->device_lock) | |
87 | #else | |
88 | # define CHECK_DEVLOCK() | |
89 | #endif | |
90 | ||
45b4233c | 91 | #ifdef DEBUG |
1da177e4 LT |
92 | #define inline |
93 | #define __inline__ | |
94 | #endif | |
95 | ||
6be9d494 BS |
96 | #define printk_rl(args...) ((void) (printk_ratelimit() && printk(args))) |
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 | { | |
5b99c2ff | 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 N |
157 | { |
158 | int slot; | |
67cc2b81 | 159 | |
d0dabf7e | 160 | if (idx == sh->pd_idx) |
67cc2b81 | 161 | return syndrome_disks; |
d0dabf7e | 162 | if (idx == sh->qd_idx) |
67cc2b81 | 163 | return syndrome_disks + 1; |
d0dabf7e N |
164 | slot = (*count)++; |
165 | return slot; | |
166 | } | |
167 | ||
a4456856 DW |
168 | static void return_io(struct bio *return_bi) |
169 | { | |
170 | struct bio *bi = return_bi; | |
171 | while (bi) { | |
a4456856 DW |
172 | |
173 | return_bi = bi->bi_next; | |
174 | bi->bi_next = NULL; | |
175 | bi->bi_size = 0; | |
0e13fe23 | 176 | bio_endio(bi, 0); |
a4456856 DW |
177 | bi = return_bi; |
178 | } | |
179 | } | |
180 | ||
1da177e4 LT |
181 | static void print_raid5_conf (raid5_conf_t *conf); |
182 | ||
600aa109 DW |
183 | static int stripe_operations_active(struct stripe_head *sh) |
184 | { | |
185 | return sh->check_state || sh->reconstruct_state || | |
186 | test_bit(STRIPE_BIOFILL_RUN, &sh->state) || | |
187 | test_bit(STRIPE_COMPUTE_RUN, &sh->state); | |
188 | } | |
189 | ||
858119e1 | 190 | static void __release_stripe(raid5_conf_t *conf, struct stripe_head *sh) |
1da177e4 LT |
191 | { |
192 | if (atomic_dec_and_test(&sh->count)) { | |
78bafebd ES |
193 | BUG_ON(!list_empty(&sh->lru)); |
194 | BUG_ON(atomic_read(&conf->active_stripes)==0); | |
1da177e4 | 195 | if (test_bit(STRIPE_HANDLE, &sh->state)) { |
7c785b7a | 196 | if (test_bit(STRIPE_DELAYED, &sh->state)) { |
1da177e4 | 197 | list_add_tail(&sh->lru, &conf->delayed_list); |
7c785b7a N |
198 | blk_plug_device(conf->mddev->queue); |
199 | } else if (test_bit(STRIPE_BIT_DELAY, &sh->state) && | |
ae3c20cc | 200 | sh->bm_seq - conf->seq_write > 0) { |
72626685 | 201 | list_add_tail(&sh->lru, &conf->bitmap_list); |
7c785b7a N |
202 | blk_plug_device(conf->mddev->queue); |
203 | } else { | |
72626685 | 204 | clear_bit(STRIPE_BIT_DELAY, &sh->state); |
1da177e4 | 205 | list_add_tail(&sh->lru, &conf->handle_list); |
72626685 | 206 | } |
1da177e4 LT |
207 | md_wakeup_thread(conf->mddev->thread); |
208 | } else { | |
600aa109 | 209 | BUG_ON(stripe_operations_active(sh)); |
1da177e4 LT |
210 | if (test_and_clear_bit(STRIPE_PREREAD_ACTIVE, &sh->state)) { |
211 | atomic_dec(&conf->preread_active_stripes); | |
212 | if (atomic_read(&conf->preread_active_stripes) < IO_THRESHOLD) | |
213 | md_wakeup_thread(conf->mddev->thread); | |
214 | } | |
1da177e4 | 215 | atomic_dec(&conf->active_stripes); |
ccfcc3c1 N |
216 | if (!test_bit(STRIPE_EXPANDING, &sh->state)) { |
217 | list_add_tail(&sh->lru, &conf->inactive_list); | |
1da177e4 | 218 | wake_up(&conf->wait_for_stripe); |
46031f9a RBJ |
219 | if (conf->retry_read_aligned) |
220 | md_wakeup_thread(conf->mddev->thread); | |
ccfcc3c1 | 221 | } |
1da177e4 LT |
222 | } |
223 | } | |
224 | } | |
d0dabf7e | 225 | |
1da177e4 LT |
226 | static void release_stripe(struct stripe_head *sh) |
227 | { | |
228 | raid5_conf_t *conf = sh->raid_conf; | |
229 | unsigned long flags; | |
16a53ecc | 230 | |
1da177e4 LT |
231 | spin_lock_irqsave(&conf->device_lock, flags); |
232 | __release_stripe(conf, sh); | |
233 | spin_unlock_irqrestore(&conf->device_lock, flags); | |
234 | } | |
235 | ||
fccddba0 | 236 | static inline void remove_hash(struct stripe_head *sh) |
1da177e4 | 237 | { |
45b4233c DW |
238 | pr_debug("remove_hash(), stripe %llu\n", |
239 | (unsigned long long)sh->sector); | |
1da177e4 | 240 | |
fccddba0 | 241 | hlist_del_init(&sh->hash); |
1da177e4 LT |
242 | } |
243 | ||
16a53ecc | 244 | static inline void insert_hash(raid5_conf_t *conf, struct stripe_head *sh) |
1da177e4 | 245 | { |
fccddba0 | 246 | struct hlist_head *hp = stripe_hash(conf, sh->sector); |
1da177e4 | 247 | |
45b4233c DW |
248 | pr_debug("insert_hash(), stripe %llu\n", |
249 | (unsigned long long)sh->sector); | |
1da177e4 LT |
250 | |
251 | CHECK_DEVLOCK(); | |
fccddba0 | 252 | hlist_add_head(&sh->hash, hp); |
1da177e4 LT |
253 | } |
254 | ||
255 | ||
256 | /* find an idle stripe, make sure it is unhashed, and return it. */ | |
257 | static struct stripe_head *get_free_stripe(raid5_conf_t *conf) | |
258 | { | |
259 | struct stripe_head *sh = NULL; | |
260 | struct list_head *first; | |
261 | ||
262 | CHECK_DEVLOCK(); | |
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 | ||
274 | static void shrink_buffers(struct stripe_head *sh, int num) | |
275 | { | |
276 | struct page *p; | |
277 | int i; | |
278 | ||
279 | for (i=0; i<num ; i++) { | |
280 | p = sh->dev[i].page; | |
281 | if (!p) | |
282 | continue; | |
283 | sh->dev[i].page = NULL; | |
2d1f3b5d | 284 | put_page(p); |
1da177e4 LT |
285 | } |
286 | } | |
287 | ||
288 | static int grow_buffers(struct stripe_head *sh, int num) | |
289 | { | |
290 | int i; | |
291 | ||
292 | for (i=0; i<num; i++) { | |
293 | struct page *page; | |
294 | ||
295 | if (!(page = alloc_page(GFP_KERNEL))) { | |
296 | return 1; | |
297 | } | |
298 | sh->dev[i].page = page; | |
299 | } | |
300 | return 0; | |
301 | } | |
302 | ||
784052ec | 303 | static void raid5_build_block(struct stripe_head *sh, int i, int previous); |
911d4ee8 N |
304 | static void stripe_set_idx(sector_t stripe, raid5_conf_t *conf, int previous, |
305 | struct stripe_head *sh); | |
1da177e4 | 306 | |
b5663ba4 | 307 | static void init_stripe(struct stripe_head *sh, sector_t sector, int previous) |
1da177e4 LT |
308 | { |
309 | raid5_conf_t *conf = sh->raid_conf; | |
7ecaa1e6 | 310 | int i; |
1da177e4 | 311 | |
78bafebd ES |
312 | BUG_ON(atomic_read(&sh->count) != 0); |
313 | BUG_ON(test_bit(STRIPE_HANDLE, &sh->state)); | |
600aa109 | 314 | BUG_ON(stripe_operations_active(sh)); |
d84e0f10 | 315 | |
1da177e4 | 316 | CHECK_DEVLOCK(); |
45b4233c | 317 | pr_debug("init_stripe called, stripe %llu\n", |
1da177e4 LT |
318 | (unsigned long long)sh->sector); |
319 | ||
320 | remove_hash(sh); | |
16a53ecc | 321 | |
86b42c71 | 322 | sh->generation = conf->generation - previous; |
b5663ba4 | 323 | sh->disks = previous ? conf->previous_raid_disks : conf->raid_disks; |
1da177e4 | 324 | sh->sector = sector; |
911d4ee8 | 325 | stripe_set_idx(sector, conf, previous, sh); |
1da177e4 LT |
326 | sh->state = 0; |
327 | ||
7ecaa1e6 N |
328 | |
329 | for (i = sh->disks; i--; ) { | |
1da177e4 LT |
330 | struct r5dev *dev = &sh->dev[i]; |
331 | ||
d84e0f10 | 332 | if (dev->toread || dev->read || dev->towrite || dev->written || |
1da177e4 | 333 | test_bit(R5_LOCKED, &dev->flags)) { |
d84e0f10 | 334 | printk(KERN_ERR "sector=%llx i=%d %p %p %p %p %d\n", |
1da177e4 | 335 | (unsigned long long)sh->sector, i, dev->toread, |
d84e0f10 | 336 | dev->read, dev->towrite, dev->written, |
1da177e4 LT |
337 | test_bit(R5_LOCKED, &dev->flags)); |
338 | BUG(); | |
339 | } | |
340 | dev->flags = 0; | |
784052ec | 341 | raid5_build_block(sh, i, previous); |
1da177e4 LT |
342 | } |
343 | insert_hash(conf, sh); | |
344 | } | |
345 | ||
86b42c71 N |
346 | static struct stripe_head *__find_stripe(raid5_conf_t *conf, sector_t sector, |
347 | short generation) | |
1da177e4 LT |
348 | { |
349 | struct stripe_head *sh; | |
fccddba0 | 350 | struct hlist_node *hn; |
1da177e4 LT |
351 | |
352 | CHECK_DEVLOCK(); | |
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 | ||
361 | static void unplug_slaves(mddev_t *mddev); | |
165125e1 | 362 | static void raid5_unplug_device(struct request_queue *q); |
1da177e4 | 363 | |
b5663ba4 N |
364 | static struct stripe_head * |
365 | get_active_stripe(raid5_conf_t *conf, sector_t sector, | |
366 | int previous, int noblock) | |
1da177e4 LT |
367 | { |
368 | struct stripe_head *sh; | |
369 | ||
45b4233c | 370 | pr_debug("get_stripe, sector %llu\n", (unsigned long long)sector); |
1da177e4 LT |
371 | |
372 | spin_lock_irq(&conf->device_lock); | |
373 | ||
374 | do { | |
72626685 N |
375 | wait_event_lock_irq(conf->wait_for_stripe, |
376 | conf->quiesce == 0, | |
377 | conf->device_lock, /* nothing */); | |
86b42c71 | 378 | sh = __find_stripe(conf, sector, conf->generation - previous); |
1da177e4 LT |
379 | if (!sh) { |
380 | if (!conf->inactive_blocked) | |
381 | sh = get_free_stripe(conf); | |
382 | if (noblock && sh == NULL) | |
383 | break; | |
384 | if (!sh) { | |
385 | conf->inactive_blocked = 1; | |
386 | wait_event_lock_irq(conf->wait_for_stripe, | |
387 | !list_empty(&conf->inactive_list) && | |
5036805b N |
388 | (atomic_read(&conf->active_stripes) |
389 | < (conf->max_nr_stripes *3/4) | |
1da177e4 LT |
390 | || !conf->inactive_blocked), |
391 | conf->device_lock, | |
f4370781 | 392 | raid5_unplug_device(conf->mddev->queue) |
1da177e4 LT |
393 | ); |
394 | conf->inactive_blocked = 0; | |
395 | } else | |
b5663ba4 | 396 | init_stripe(sh, sector, previous); |
1da177e4 LT |
397 | } else { |
398 | if (atomic_read(&sh->count)) { | |
ab69ae12 N |
399 | BUG_ON(!list_empty(&sh->lru) |
400 | && !test_bit(STRIPE_EXPANDING, &sh->state)); | |
1da177e4 LT |
401 | } else { |
402 | if (!test_bit(STRIPE_HANDLE, &sh->state)) | |
403 | atomic_inc(&conf->active_stripes); | |
ff4e8d9a N |
404 | if (list_empty(&sh->lru) && |
405 | !test_bit(STRIPE_EXPANDING, &sh->state)) | |
16a53ecc N |
406 | BUG(); |
407 | list_del_init(&sh->lru); | |
1da177e4 LT |
408 | } |
409 | } | |
410 | } while (sh == NULL); | |
411 | ||
412 | if (sh) | |
413 | atomic_inc(&sh->count); | |
414 | ||
415 | spin_unlock_irq(&conf->device_lock); | |
416 | return sh; | |
417 | } | |
418 | ||
6712ecf8 N |
419 | static void |
420 | raid5_end_read_request(struct bio *bi, int error); | |
421 | static void | |
422 | raid5_end_write_request(struct bio *bi, int error); | |
91c00924 | 423 | |
c4e5ac0a | 424 | static void ops_run_io(struct stripe_head *sh, struct stripe_head_state *s) |
91c00924 DW |
425 | { |
426 | raid5_conf_t *conf = sh->raid_conf; | |
427 | int i, disks = sh->disks; | |
428 | ||
429 | might_sleep(); | |
430 | ||
431 | for (i = disks; i--; ) { | |
432 | int rw; | |
433 | struct bio *bi; | |
434 | mdk_rdev_t *rdev; | |
435 | if (test_and_clear_bit(R5_Wantwrite, &sh->dev[i].flags)) | |
436 | rw = WRITE; | |
437 | else if (test_and_clear_bit(R5_Wantread, &sh->dev[i].flags)) | |
438 | rw = READ; | |
439 | else | |
440 | continue; | |
441 | ||
442 | bi = &sh->dev[i].req; | |
443 | ||
444 | bi->bi_rw = rw; | |
445 | if (rw == WRITE) | |
446 | bi->bi_end_io = raid5_end_write_request; | |
447 | else | |
448 | bi->bi_end_io = raid5_end_read_request; | |
449 | ||
450 | rcu_read_lock(); | |
451 | rdev = rcu_dereference(conf->disks[i].rdev); | |
452 | if (rdev && test_bit(Faulty, &rdev->flags)) | |
453 | rdev = NULL; | |
454 | if (rdev) | |
455 | atomic_inc(&rdev->nr_pending); | |
456 | rcu_read_unlock(); | |
457 | ||
458 | if (rdev) { | |
c4e5ac0a | 459 | if (s->syncing || s->expanding || s->expanded) |
91c00924 DW |
460 | md_sync_acct(rdev->bdev, STRIPE_SECTORS); |
461 | ||
2b7497f0 DW |
462 | set_bit(STRIPE_IO_STARTED, &sh->state); |
463 | ||
91c00924 DW |
464 | bi->bi_bdev = rdev->bdev; |
465 | pr_debug("%s: for %llu schedule op %ld on disc %d\n", | |
e46b272b | 466 | __func__, (unsigned long long)sh->sector, |
91c00924 DW |
467 | bi->bi_rw, i); |
468 | atomic_inc(&sh->count); | |
469 | bi->bi_sector = sh->sector + rdev->data_offset; | |
470 | bi->bi_flags = 1 << BIO_UPTODATE; | |
471 | bi->bi_vcnt = 1; | |
472 | bi->bi_max_vecs = 1; | |
473 | bi->bi_idx = 0; | |
474 | bi->bi_io_vec = &sh->dev[i].vec; | |
475 | bi->bi_io_vec[0].bv_len = STRIPE_SIZE; | |
476 | bi->bi_io_vec[0].bv_offset = 0; | |
477 | bi->bi_size = STRIPE_SIZE; | |
478 | bi->bi_next = NULL; | |
479 | if (rw == WRITE && | |
480 | test_bit(R5_ReWrite, &sh->dev[i].flags)) | |
481 | atomic_add(STRIPE_SECTORS, | |
482 | &rdev->corrected_errors); | |
483 | generic_make_request(bi); | |
484 | } else { | |
485 | if (rw == WRITE) | |
486 | set_bit(STRIPE_DEGRADED, &sh->state); | |
487 | pr_debug("skip op %ld on disc %d for sector %llu\n", | |
488 | bi->bi_rw, i, (unsigned long long)sh->sector); | |
489 | clear_bit(R5_LOCKED, &sh->dev[i].flags); | |
490 | set_bit(STRIPE_HANDLE, &sh->state); | |
491 | } | |
492 | } | |
493 | } | |
494 | ||
495 | static struct dma_async_tx_descriptor * | |
496 | async_copy_data(int frombio, struct bio *bio, struct page *page, | |
497 | sector_t sector, struct dma_async_tx_descriptor *tx) | |
498 | { | |
499 | struct bio_vec *bvl; | |
500 | struct page *bio_page; | |
501 | int i; | |
502 | int page_offset; | |
a08abd8c | 503 | struct async_submit_ctl submit; |
91c00924 DW |
504 | |
505 | if (bio->bi_sector >= sector) | |
506 | page_offset = (signed)(bio->bi_sector - sector) * 512; | |
507 | else | |
508 | page_offset = (signed)(sector - bio->bi_sector) * -512; | |
a08abd8c DW |
509 | |
510 | init_async_submit(&submit, 0, tx, NULL, NULL, NULL); | |
91c00924 DW |
511 | bio_for_each_segment(bvl, bio, i) { |
512 | int len = bio_iovec_idx(bio, i)->bv_len; | |
513 | int clen; | |
514 | int b_offset = 0; | |
515 | ||
516 | if (page_offset < 0) { | |
517 | b_offset = -page_offset; | |
518 | page_offset += b_offset; | |
519 | len -= b_offset; | |
520 | } | |
521 | ||
522 | if (len > 0 && page_offset + len > STRIPE_SIZE) | |
523 | clen = STRIPE_SIZE - page_offset; | |
524 | else | |
525 | clen = len; | |
526 | ||
527 | if (clen > 0) { | |
528 | b_offset += bio_iovec_idx(bio, i)->bv_offset; | |
529 | bio_page = bio_iovec_idx(bio, i)->bv_page; | |
530 | if (frombio) | |
531 | tx = async_memcpy(page, bio_page, page_offset, | |
a08abd8c | 532 | b_offset, clen, &submit); |
91c00924 DW |
533 | else |
534 | tx = async_memcpy(bio_page, page, b_offset, | |
a08abd8c | 535 | page_offset, clen, &submit); |
91c00924 | 536 | } |
a08abd8c DW |
537 | /* chain the operations */ |
538 | submit.depend_tx = tx; | |
539 | ||
91c00924 DW |
540 | if (clen < len) /* hit end of page */ |
541 | break; | |
542 | page_offset += len; | |
543 | } | |
544 | ||
545 | return tx; | |
546 | } | |
547 | ||
548 | static void ops_complete_biofill(void *stripe_head_ref) | |
549 | { | |
550 | struct stripe_head *sh = stripe_head_ref; | |
551 | struct bio *return_bi = NULL; | |
552 | raid5_conf_t *conf = sh->raid_conf; | |
e4d84909 | 553 | int i; |
91c00924 | 554 | |
e46b272b | 555 | pr_debug("%s: stripe %llu\n", __func__, |
91c00924 DW |
556 | (unsigned long long)sh->sector); |
557 | ||
558 | /* clear completed biofills */ | |
83de75cc | 559 | spin_lock_irq(&conf->device_lock); |
91c00924 DW |
560 | for (i = sh->disks; i--; ) { |
561 | struct r5dev *dev = &sh->dev[i]; | |
91c00924 DW |
562 | |
563 | /* acknowledge completion of a biofill operation */ | |
e4d84909 DW |
564 | /* and check if we need to reply to a read request, |
565 | * new R5_Wantfill requests are held off until | |
83de75cc | 566 | * !STRIPE_BIOFILL_RUN |
e4d84909 DW |
567 | */ |
568 | if (test_and_clear_bit(R5_Wantfill, &dev->flags)) { | |
91c00924 | 569 | struct bio *rbi, *rbi2; |
91c00924 | 570 | |
91c00924 DW |
571 | BUG_ON(!dev->read); |
572 | rbi = dev->read; | |
573 | dev->read = NULL; | |
574 | while (rbi && rbi->bi_sector < | |
575 | dev->sector + STRIPE_SECTORS) { | |
576 | rbi2 = r5_next_bio(rbi, dev->sector); | |
960e739d | 577 | if (!raid5_dec_bi_phys_segments(rbi)) { |
91c00924 DW |
578 | rbi->bi_next = return_bi; |
579 | return_bi = rbi; | |
580 | } | |
91c00924 DW |
581 | rbi = rbi2; |
582 | } | |
583 | } | |
584 | } | |
83de75cc DW |
585 | spin_unlock_irq(&conf->device_lock); |
586 | clear_bit(STRIPE_BIOFILL_RUN, &sh->state); | |
91c00924 DW |
587 | |
588 | return_io(return_bi); | |
589 | ||
e4d84909 | 590 | set_bit(STRIPE_HANDLE, &sh->state); |
91c00924 DW |
591 | release_stripe(sh); |
592 | } | |
593 | ||
594 | static void ops_run_biofill(struct stripe_head *sh) | |
595 | { | |
596 | struct dma_async_tx_descriptor *tx = NULL; | |
597 | raid5_conf_t *conf = sh->raid_conf; | |
a08abd8c | 598 | struct async_submit_ctl submit; |
91c00924 DW |
599 | int i; |
600 | ||
e46b272b | 601 | pr_debug("%s: stripe %llu\n", __func__, |
91c00924 DW |
602 | (unsigned long long)sh->sector); |
603 | ||
604 | for (i = sh->disks; i--; ) { | |
605 | struct r5dev *dev = &sh->dev[i]; | |
606 | if (test_bit(R5_Wantfill, &dev->flags)) { | |
607 | struct bio *rbi; | |
608 | spin_lock_irq(&conf->device_lock); | |
609 | dev->read = rbi = dev->toread; | |
610 | dev->toread = NULL; | |
611 | spin_unlock_irq(&conf->device_lock); | |
612 | while (rbi && rbi->bi_sector < | |
613 | dev->sector + STRIPE_SECTORS) { | |
614 | tx = async_copy_data(0, rbi, dev->page, | |
615 | dev->sector, tx); | |
616 | rbi = r5_next_bio(rbi, dev->sector); | |
617 | } | |
618 | } | |
619 | } | |
620 | ||
621 | atomic_inc(&sh->count); | |
a08abd8c DW |
622 | init_async_submit(&submit, ASYNC_TX_ACK, tx, ops_complete_biofill, sh, NULL); |
623 | async_trigger_callback(&submit); | |
91c00924 DW |
624 | } |
625 | ||
626 | static void ops_complete_compute5(void *stripe_head_ref) | |
627 | { | |
628 | struct stripe_head *sh = stripe_head_ref; | |
629 | int target = sh->ops.target; | |
630 | struct r5dev *tgt = &sh->dev[target]; | |
631 | ||
e46b272b | 632 | pr_debug("%s: stripe %llu\n", __func__, |
91c00924 DW |
633 | (unsigned long long)sh->sector); |
634 | ||
635 | set_bit(R5_UPTODATE, &tgt->flags); | |
636 | BUG_ON(!test_bit(R5_Wantcompute, &tgt->flags)); | |
637 | clear_bit(R5_Wantcompute, &tgt->flags); | |
ecc65c9b DW |
638 | clear_bit(STRIPE_COMPUTE_RUN, &sh->state); |
639 | if (sh->check_state == check_state_compute_run) | |
640 | sh->check_state = check_state_compute_result; | |
91c00924 DW |
641 | set_bit(STRIPE_HANDLE, &sh->state); |
642 | release_stripe(sh); | |
643 | } | |
644 | ||
d6f38f31 DW |
645 | /* return a pointer to the address conversion region of the scribble buffer */ |
646 | static addr_conv_t *to_addr_conv(struct stripe_head *sh, | |
647 | struct raid5_percpu *percpu) | |
648 | { | |
649 | return percpu->scribble + sizeof(struct page *) * (sh->disks + 2); | |
650 | } | |
651 | ||
652 | static struct dma_async_tx_descriptor * | |
653 | ops_run_compute5(struct stripe_head *sh, struct raid5_percpu *percpu) | |
91c00924 | 654 | { |
91c00924 | 655 | int disks = sh->disks; |
d6f38f31 | 656 | struct page **xor_srcs = percpu->scribble; |
91c00924 DW |
657 | int target = sh->ops.target; |
658 | struct r5dev *tgt = &sh->dev[target]; | |
659 | struct page *xor_dest = tgt->page; | |
660 | int count = 0; | |
661 | struct dma_async_tx_descriptor *tx; | |
a08abd8c | 662 | struct async_submit_ctl submit; |
91c00924 DW |
663 | int i; |
664 | ||
665 | pr_debug("%s: stripe %llu block: %d\n", | |
e46b272b | 666 | __func__, (unsigned long long)sh->sector, target); |
91c00924 DW |
667 | BUG_ON(!test_bit(R5_Wantcompute, &tgt->flags)); |
668 | ||
669 | for (i = disks; i--; ) | |
670 | if (i != target) | |
671 | xor_srcs[count++] = sh->dev[i].page; | |
672 | ||
673 | atomic_inc(&sh->count); | |
674 | ||
a08abd8c | 675 | init_async_submit(&submit, ASYNC_TX_XOR_ZERO_DST, NULL, |
d6f38f31 | 676 | ops_complete_compute5, sh, to_addr_conv(sh, percpu)); |
91c00924 | 677 | if (unlikely(count == 1)) |
a08abd8c | 678 | tx = async_memcpy(xor_dest, xor_srcs[0], 0, 0, STRIPE_SIZE, &submit); |
91c00924 | 679 | else |
a08abd8c | 680 | tx = async_xor(xor_dest, xor_srcs, 0, count, STRIPE_SIZE, &submit); |
91c00924 | 681 | |
91c00924 DW |
682 | return tx; |
683 | } | |
684 | ||
685 | static void ops_complete_prexor(void *stripe_head_ref) | |
686 | { | |
687 | struct stripe_head *sh = stripe_head_ref; | |
688 | ||
e46b272b | 689 | pr_debug("%s: stripe %llu\n", __func__, |
91c00924 | 690 | (unsigned long long)sh->sector); |
91c00924 DW |
691 | } |
692 | ||
693 | static struct dma_async_tx_descriptor * | |
d6f38f31 DW |
694 | ops_run_prexor(struct stripe_head *sh, struct raid5_percpu *percpu, |
695 | struct dma_async_tx_descriptor *tx) | |
91c00924 | 696 | { |
91c00924 | 697 | int disks = sh->disks; |
d6f38f31 | 698 | struct page **xor_srcs = percpu->scribble; |
91c00924 | 699 | int count = 0, pd_idx = sh->pd_idx, i; |
a08abd8c | 700 | struct async_submit_ctl submit; |
91c00924 DW |
701 | |
702 | /* existing parity data subtracted */ | |
703 | struct page *xor_dest = xor_srcs[count++] = sh->dev[pd_idx].page; | |
704 | ||
e46b272b | 705 | pr_debug("%s: stripe %llu\n", __func__, |
91c00924 DW |
706 | (unsigned long long)sh->sector); |
707 | ||
708 | for (i = disks; i--; ) { | |
709 | struct r5dev *dev = &sh->dev[i]; | |
710 | /* Only process blocks that are known to be uptodate */ | |
d8ee0728 | 711 | if (test_bit(R5_Wantdrain, &dev->flags)) |
91c00924 DW |
712 | xor_srcs[count++] = dev->page; |
713 | } | |
714 | ||
a08abd8c | 715 | init_async_submit(&submit, ASYNC_TX_XOR_DROP_DST, tx, |
d6f38f31 | 716 | ops_complete_prexor, sh, to_addr_conv(sh, percpu)); |
a08abd8c | 717 | tx = async_xor(xor_dest, xor_srcs, 0, count, STRIPE_SIZE, &submit); |
91c00924 DW |
718 | |
719 | return tx; | |
720 | } | |
721 | ||
722 | static struct dma_async_tx_descriptor * | |
d8ee0728 | 723 | ops_run_biodrain(struct stripe_head *sh, struct dma_async_tx_descriptor *tx) |
91c00924 DW |
724 | { |
725 | int disks = sh->disks; | |
d8ee0728 | 726 | int i; |
91c00924 | 727 | |
e46b272b | 728 | pr_debug("%s: stripe %llu\n", __func__, |
91c00924 DW |
729 | (unsigned long long)sh->sector); |
730 | ||
731 | for (i = disks; i--; ) { | |
732 | struct r5dev *dev = &sh->dev[i]; | |
733 | struct bio *chosen; | |
91c00924 | 734 | |
d8ee0728 | 735 | if (test_and_clear_bit(R5_Wantdrain, &dev->flags)) { |
91c00924 DW |
736 | struct bio *wbi; |
737 | ||
738 | spin_lock(&sh->lock); | |
739 | chosen = dev->towrite; | |
740 | dev->towrite = NULL; | |
741 | BUG_ON(dev->written); | |
742 | wbi = dev->written = chosen; | |
743 | spin_unlock(&sh->lock); | |
744 | ||
745 | while (wbi && wbi->bi_sector < | |
746 | dev->sector + STRIPE_SECTORS) { | |
747 | tx = async_copy_data(1, wbi, dev->page, | |
748 | dev->sector, tx); | |
749 | wbi = r5_next_bio(wbi, dev->sector); | |
750 | } | |
751 | } | |
752 | } | |
753 | ||
754 | return tx; | |
755 | } | |
756 | ||
757 | static void ops_complete_postxor(void *stripe_head_ref) | |
91c00924 DW |
758 | { |
759 | struct stripe_head *sh = stripe_head_ref; | |
760 | int disks = sh->disks, i, pd_idx = sh->pd_idx; | |
761 | ||
e46b272b | 762 | pr_debug("%s: stripe %llu\n", __func__, |
91c00924 DW |
763 | (unsigned long long)sh->sector); |
764 | ||
765 | for (i = disks; i--; ) { | |
766 | struct r5dev *dev = &sh->dev[i]; | |
767 | if (dev->written || i == pd_idx) | |
768 | set_bit(R5_UPTODATE, &dev->flags); | |
769 | } | |
770 | ||
d8ee0728 DW |
771 | if (sh->reconstruct_state == reconstruct_state_drain_run) |
772 | sh->reconstruct_state = reconstruct_state_drain_result; | |
773 | else if (sh->reconstruct_state == reconstruct_state_prexor_drain_run) | |
774 | sh->reconstruct_state = reconstruct_state_prexor_drain_result; | |
775 | else { | |
776 | BUG_ON(sh->reconstruct_state != reconstruct_state_run); | |
777 | sh->reconstruct_state = reconstruct_state_result; | |
778 | } | |
91c00924 DW |
779 | |
780 | set_bit(STRIPE_HANDLE, &sh->state); | |
781 | release_stripe(sh); | |
782 | } | |
783 | ||
784 | static void | |
d6f38f31 DW |
785 | ops_run_postxor(struct stripe_head *sh, struct raid5_percpu *percpu, |
786 | struct dma_async_tx_descriptor *tx) | |
91c00924 | 787 | { |
91c00924 | 788 | int disks = sh->disks; |
d6f38f31 | 789 | struct page **xor_srcs = percpu->scribble; |
a08abd8c | 790 | struct async_submit_ctl submit; |
91c00924 DW |
791 | int count = 0, pd_idx = sh->pd_idx, i; |
792 | struct page *xor_dest; | |
d8ee0728 | 793 | int prexor = 0; |
91c00924 | 794 | unsigned long flags; |
91c00924 | 795 | |
e46b272b | 796 | pr_debug("%s: stripe %llu\n", __func__, |
91c00924 DW |
797 | (unsigned long long)sh->sector); |
798 | ||
799 | /* check if prexor is active which means only process blocks | |
800 | * that are part of a read-modify-write (written) | |
801 | */ | |
d8ee0728 DW |
802 | if (sh->reconstruct_state == reconstruct_state_prexor_drain_run) { |
803 | prexor = 1; | |
91c00924 DW |
804 | xor_dest = xor_srcs[count++] = sh->dev[pd_idx].page; |
805 | for (i = disks; i--; ) { | |
806 | struct r5dev *dev = &sh->dev[i]; | |
807 | if (dev->written) | |
808 | xor_srcs[count++] = dev->page; | |
809 | } | |
810 | } else { | |
811 | xor_dest = sh->dev[pd_idx].page; | |
812 | for (i = disks; i--; ) { | |
813 | struct r5dev *dev = &sh->dev[i]; | |
814 | if (i != pd_idx) | |
815 | xor_srcs[count++] = dev->page; | |
816 | } | |
817 | } | |
818 | ||
91c00924 DW |
819 | /* 1/ if we prexor'd then the dest is reused as a source |
820 | * 2/ if we did not prexor then we are redoing the parity | |
821 | * set ASYNC_TX_XOR_DROP_DST and ASYNC_TX_XOR_ZERO_DST | |
822 | * for the synchronous xor case | |
823 | */ | |
88ba2aa5 | 824 | flags = ASYNC_TX_ACK | |
91c00924 DW |
825 | (prexor ? ASYNC_TX_XOR_DROP_DST : ASYNC_TX_XOR_ZERO_DST); |
826 | ||
827 | atomic_inc(&sh->count); | |
828 | ||
d6f38f31 DW |
829 | init_async_submit(&submit, flags, tx, ops_complete_postxor, sh, |
830 | to_addr_conv(sh, percpu)); | |
a08abd8c DW |
831 | if (unlikely(count == 1)) |
832 | tx = async_memcpy(xor_dest, xor_srcs[0], 0, 0, STRIPE_SIZE, &submit); | |
833 | else | |
834 | tx = async_xor(xor_dest, xor_srcs, 0, count, STRIPE_SIZE, &submit); | |
91c00924 DW |
835 | } |
836 | ||
837 | static void ops_complete_check(void *stripe_head_ref) | |
838 | { | |
839 | struct stripe_head *sh = stripe_head_ref; | |
91c00924 | 840 | |
e46b272b | 841 | pr_debug("%s: stripe %llu\n", __func__, |
91c00924 DW |
842 | (unsigned long long)sh->sector); |
843 | ||
ecc65c9b | 844 | sh->check_state = check_state_check_result; |
91c00924 DW |
845 | set_bit(STRIPE_HANDLE, &sh->state); |
846 | release_stripe(sh); | |
847 | } | |
848 | ||
d6f38f31 | 849 | static void ops_run_check(struct stripe_head *sh, struct raid5_percpu *percpu) |
91c00924 | 850 | { |
91c00924 | 851 | int disks = sh->disks; |
d6f38f31 | 852 | struct page **xor_srcs = percpu->scribble; |
91c00924 | 853 | struct dma_async_tx_descriptor *tx; |
a08abd8c | 854 | struct async_submit_ctl submit; |
91c00924 DW |
855 | |
856 | int count = 0, pd_idx = sh->pd_idx, i; | |
857 | struct page *xor_dest = xor_srcs[count++] = sh->dev[pd_idx].page; | |
858 | ||
e46b272b | 859 | pr_debug("%s: stripe %llu\n", __func__, |
91c00924 DW |
860 | (unsigned long long)sh->sector); |
861 | ||
862 | for (i = disks; i--; ) { | |
863 | struct r5dev *dev = &sh->dev[i]; | |
864 | if (i != pd_idx) | |
865 | xor_srcs[count++] = dev->page; | |
866 | } | |
867 | ||
d6f38f31 DW |
868 | init_async_submit(&submit, 0, NULL, NULL, NULL, |
869 | to_addr_conv(sh, percpu)); | |
099f53cb | 870 | tx = async_xor_val(xor_dest, xor_srcs, 0, count, STRIPE_SIZE, |
a08abd8c | 871 | &sh->ops.zero_sum_result, &submit); |
91c00924 | 872 | |
91c00924 | 873 | atomic_inc(&sh->count); |
a08abd8c DW |
874 | init_async_submit(&submit, ASYNC_TX_ACK, tx, ops_complete_check, sh, NULL); |
875 | tx = async_trigger_callback(&submit); | |
91c00924 DW |
876 | } |
877 | ||
600aa109 | 878 | static void raid5_run_ops(struct stripe_head *sh, unsigned long ops_request) |
91c00924 DW |
879 | { |
880 | int overlap_clear = 0, i, disks = sh->disks; | |
881 | struct dma_async_tx_descriptor *tx = NULL; | |
d6f38f31 DW |
882 | raid5_conf_t *conf = sh->raid_conf; |
883 | struct raid5_percpu *percpu; | |
884 | unsigned long cpu; | |
91c00924 | 885 | |
d6f38f31 DW |
886 | cpu = get_cpu(); |
887 | percpu = per_cpu_ptr(conf->percpu, cpu); | |
83de75cc | 888 | if (test_bit(STRIPE_OP_BIOFILL, &ops_request)) { |
91c00924 DW |
889 | ops_run_biofill(sh); |
890 | overlap_clear++; | |
891 | } | |
892 | ||
7b3a871e | 893 | if (test_bit(STRIPE_OP_COMPUTE_BLK, &ops_request)) { |
d6f38f31 | 894 | tx = ops_run_compute5(sh, percpu); |
7b3a871e DW |
895 | /* terminate the chain if postxor is not set to be run */ |
896 | if (tx && !test_bit(STRIPE_OP_POSTXOR, &ops_request)) | |
897 | async_tx_ack(tx); | |
898 | } | |
91c00924 | 899 | |
600aa109 | 900 | if (test_bit(STRIPE_OP_PREXOR, &ops_request)) |
d6f38f31 | 901 | tx = ops_run_prexor(sh, percpu, tx); |
91c00924 | 902 | |
600aa109 | 903 | if (test_bit(STRIPE_OP_BIODRAIN, &ops_request)) { |
d8ee0728 | 904 | tx = ops_run_biodrain(sh, tx); |
91c00924 DW |
905 | overlap_clear++; |
906 | } | |
907 | ||
600aa109 | 908 | if (test_bit(STRIPE_OP_POSTXOR, &ops_request)) |
d6f38f31 | 909 | ops_run_postxor(sh, percpu, tx); |
91c00924 | 910 | |
ecc65c9b | 911 | if (test_bit(STRIPE_OP_CHECK, &ops_request)) |
d6f38f31 | 912 | ops_run_check(sh, percpu); |
91c00924 | 913 | |
91c00924 DW |
914 | if (overlap_clear) |
915 | for (i = disks; i--; ) { | |
916 | struct r5dev *dev = &sh->dev[i]; | |
917 | if (test_and_clear_bit(R5_Overlap, &dev->flags)) | |
918 | wake_up(&sh->raid_conf->wait_for_overlap); | |
919 | } | |
d6f38f31 | 920 | put_cpu(); |
91c00924 DW |
921 | } |
922 | ||
3f294f4f | 923 | static int grow_one_stripe(raid5_conf_t *conf) |
1da177e4 LT |
924 | { |
925 | struct stripe_head *sh; | |
3f294f4f N |
926 | sh = kmem_cache_alloc(conf->slab_cache, GFP_KERNEL); |
927 | if (!sh) | |
928 | return 0; | |
929 | memset(sh, 0, sizeof(*sh) + (conf->raid_disks-1)*sizeof(struct r5dev)); | |
930 | sh->raid_conf = conf; | |
931 | spin_lock_init(&sh->lock); | |
932 | ||
933 | if (grow_buffers(sh, conf->raid_disks)) { | |
934 | shrink_buffers(sh, conf->raid_disks); | |
935 | kmem_cache_free(conf->slab_cache, sh); | |
936 | return 0; | |
937 | } | |
7ecaa1e6 | 938 | sh->disks = conf->raid_disks; |
3f294f4f N |
939 | /* we just created an active stripe so... */ |
940 | atomic_set(&sh->count, 1); | |
941 | atomic_inc(&conf->active_stripes); | |
942 | INIT_LIST_HEAD(&sh->lru); | |
943 | release_stripe(sh); | |
944 | return 1; | |
945 | } | |
946 | ||
947 | static int grow_stripes(raid5_conf_t *conf, int num) | |
948 | { | |
e18b890b | 949 | struct kmem_cache *sc; |
1da177e4 LT |
950 | int devs = conf->raid_disks; |
951 | ||
245f46c2 N |
952 | sprintf(conf->cache_name[0], |
953 | "raid%d-%s", conf->level, mdname(conf->mddev)); | |
954 | sprintf(conf->cache_name[1], | |
955 | "raid%d-%s-alt", conf->level, mdname(conf->mddev)); | |
ad01c9e3 N |
956 | conf->active_name = 0; |
957 | sc = kmem_cache_create(conf->cache_name[conf->active_name], | |
1da177e4 | 958 | sizeof(struct stripe_head)+(devs-1)*sizeof(struct r5dev), |
20c2df83 | 959 | 0, 0, NULL); |
1da177e4 LT |
960 | if (!sc) |
961 | return 1; | |
962 | conf->slab_cache = sc; | |
ad01c9e3 | 963 | conf->pool_size = devs; |
16a53ecc | 964 | while (num--) |
3f294f4f | 965 | if (!grow_one_stripe(conf)) |
1da177e4 | 966 | return 1; |
1da177e4 LT |
967 | return 0; |
968 | } | |
29269553 | 969 | |
d6f38f31 DW |
970 | /** |
971 | * scribble_len - return the required size of the scribble region | |
972 | * @num - total number of disks in the array | |
973 | * | |
974 | * The size must be enough to contain: | |
975 | * 1/ a struct page pointer for each device in the array +2 | |
976 | * 2/ room to convert each entry in (1) to its corresponding dma | |
977 | * (dma_map_page()) or page (page_address()) address. | |
978 | * | |
979 | * Note: the +2 is for the destination buffers of the ddf/raid6 case where we | |
980 | * calculate over all devices (not just the data blocks), using zeros in place | |
981 | * of the P and Q blocks. | |
982 | */ | |
983 | static size_t scribble_len(int num) | |
984 | { | |
985 | size_t len; | |
986 | ||
987 | len = sizeof(struct page *) * (num+2) + sizeof(addr_conv_t) * (num+2); | |
988 | ||
989 | return len; | |
990 | } | |
991 | ||
ad01c9e3 N |
992 | static int resize_stripes(raid5_conf_t *conf, int newsize) |
993 | { | |
994 | /* Make all the stripes able to hold 'newsize' devices. | |
995 | * New slots in each stripe get 'page' set to a new page. | |
996 | * | |
997 | * This happens in stages: | |
998 | * 1/ create a new kmem_cache and allocate the required number of | |
999 | * stripe_heads. | |
1000 | * 2/ gather all the old stripe_heads and tranfer the pages across | |
1001 | * to the new stripe_heads. This will have the side effect of | |
1002 | * freezing the array as once all stripe_heads have been collected, | |
1003 | * no IO will be possible. Old stripe heads are freed once their | |
1004 | * pages have been transferred over, and the old kmem_cache is | |
1005 | * freed when all stripes are done. | |
1006 | * 3/ reallocate conf->disks to be suitable bigger. If this fails, | |
1007 | * we simple return a failre status - no need to clean anything up. | |
1008 | * 4/ allocate new pages for the new slots in the new stripe_heads. | |
1009 | * If this fails, we don't bother trying the shrink the | |
1010 | * stripe_heads down again, we just leave them as they are. | |
1011 | * As each stripe_head is processed the new one is released into | |
1012 | * active service. | |
1013 | * | |
1014 | * Once step2 is started, we cannot afford to wait for a write, | |
1015 | * so we use GFP_NOIO allocations. | |
1016 | */ | |
1017 | struct stripe_head *osh, *nsh; | |
1018 | LIST_HEAD(newstripes); | |
1019 | struct disk_info *ndisks; | |
d6f38f31 | 1020 | unsigned long cpu; |
b5470dc5 | 1021 | int err; |
e18b890b | 1022 | struct kmem_cache *sc; |
ad01c9e3 N |
1023 | int i; |
1024 | ||
1025 | if (newsize <= conf->pool_size) | |
1026 | return 0; /* never bother to shrink */ | |
1027 | ||
b5470dc5 DW |
1028 | err = md_allow_write(conf->mddev); |
1029 | if (err) | |
1030 | return err; | |
2a2275d6 | 1031 | |
ad01c9e3 N |
1032 | /* Step 1 */ |
1033 | sc = kmem_cache_create(conf->cache_name[1-conf->active_name], | |
1034 | sizeof(struct stripe_head)+(newsize-1)*sizeof(struct r5dev), | |
20c2df83 | 1035 | 0, 0, NULL); |
ad01c9e3 N |
1036 | if (!sc) |
1037 | return -ENOMEM; | |
1038 | ||
1039 | for (i = conf->max_nr_stripes; i; i--) { | |
1040 | nsh = kmem_cache_alloc(sc, GFP_KERNEL); | |
1041 | if (!nsh) | |
1042 | break; | |
1043 | ||
1044 | memset(nsh, 0, sizeof(*nsh) + (newsize-1)*sizeof(struct r5dev)); | |
1045 | ||
1046 | nsh->raid_conf = conf; | |
1047 | spin_lock_init(&nsh->lock); | |
1048 | ||
1049 | list_add(&nsh->lru, &newstripes); | |
1050 | } | |
1051 | if (i) { | |
1052 | /* didn't get enough, give up */ | |
1053 | while (!list_empty(&newstripes)) { | |
1054 | nsh = list_entry(newstripes.next, struct stripe_head, lru); | |
1055 | list_del(&nsh->lru); | |
1056 | kmem_cache_free(sc, nsh); | |
1057 | } | |
1058 | kmem_cache_destroy(sc); | |
1059 | return -ENOMEM; | |
1060 | } | |
1061 | /* Step 2 - Must use GFP_NOIO now. | |
1062 | * OK, we have enough stripes, start collecting inactive | |
1063 | * stripes and copying them over | |
1064 | */ | |
1065 | list_for_each_entry(nsh, &newstripes, lru) { | |
1066 | spin_lock_irq(&conf->device_lock); | |
1067 | wait_event_lock_irq(conf->wait_for_stripe, | |
1068 | !list_empty(&conf->inactive_list), | |
1069 | conf->device_lock, | |
b3b46be3 | 1070 | unplug_slaves(conf->mddev) |
ad01c9e3 N |
1071 | ); |
1072 | osh = get_free_stripe(conf); | |
1073 | spin_unlock_irq(&conf->device_lock); | |
1074 | atomic_set(&nsh->count, 1); | |
1075 | for(i=0; i<conf->pool_size; i++) | |
1076 | nsh->dev[i].page = osh->dev[i].page; | |
1077 | for( ; i<newsize; i++) | |
1078 | nsh->dev[i].page = NULL; | |
1079 | kmem_cache_free(conf->slab_cache, osh); | |
1080 | } | |
1081 | kmem_cache_destroy(conf->slab_cache); | |
1082 | ||
1083 | /* Step 3. | |
1084 | * At this point, we are holding all the stripes so the array | |
1085 | * is completely stalled, so now is a good time to resize | |
d6f38f31 | 1086 | * conf->disks and the scribble region |
ad01c9e3 N |
1087 | */ |
1088 | ndisks = kzalloc(newsize * sizeof(struct disk_info), GFP_NOIO); | |
1089 | if (ndisks) { | |
1090 | for (i=0; i<conf->raid_disks; i++) | |
1091 | ndisks[i] = conf->disks[i]; | |
1092 | kfree(conf->disks); | |
1093 | conf->disks = ndisks; | |
1094 | } else | |
1095 | err = -ENOMEM; | |
1096 | ||
d6f38f31 DW |
1097 | get_online_cpus(); |
1098 | conf->scribble_len = scribble_len(newsize); | |
1099 | for_each_present_cpu(cpu) { | |
1100 | struct raid5_percpu *percpu; | |
1101 | void *scribble; | |
1102 | ||
1103 | percpu = per_cpu_ptr(conf->percpu, cpu); | |
1104 | scribble = kmalloc(conf->scribble_len, GFP_NOIO); | |
1105 | ||
1106 | if (scribble) { | |
1107 | kfree(percpu->scribble); | |
1108 | percpu->scribble = scribble; | |
1109 | } else { | |
1110 | err = -ENOMEM; | |
1111 | break; | |
1112 | } | |
1113 | } | |
1114 | put_online_cpus(); | |
1115 | ||
ad01c9e3 N |
1116 | /* Step 4, return new stripes to service */ |
1117 | while(!list_empty(&newstripes)) { | |
1118 | nsh = list_entry(newstripes.next, struct stripe_head, lru); | |
1119 | list_del_init(&nsh->lru); | |
d6f38f31 | 1120 | |
ad01c9e3 N |
1121 | for (i=conf->raid_disks; i < newsize; i++) |
1122 | if (nsh->dev[i].page == NULL) { | |
1123 | struct page *p = alloc_page(GFP_NOIO); | |
1124 | nsh->dev[i].page = p; | |
1125 | if (!p) | |
1126 | err = -ENOMEM; | |
1127 | } | |
1128 | release_stripe(nsh); | |
1129 | } | |
1130 | /* critical section pass, GFP_NOIO no longer needed */ | |
1131 | ||
1132 | conf->slab_cache = sc; | |
1133 | conf->active_name = 1-conf->active_name; | |
1134 | conf->pool_size = newsize; | |
1135 | return err; | |
1136 | } | |
1da177e4 | 1137 | |
3f294f4f | 1138 | static int drop_one_stripe(raid5_conf_t *conf) |
1da177e4 LT |
1139 | { |
1140 | struct stripe_head *sh; | |
1141 | ||
3f294f4f N |
1142 | spin_lock_irq(&conf->device_lock); |
1143 | sh = get_free_stripe(conf); | |
1144 | spin_unlock_irq(&conf->device_lock); | |
1145 | if (!sh) | |
1146 | return 0; | |
78bafebd | 1147 | BUG_ON(atomic_read(&sh->count)); |
ad01c9e3 | 1148 | shrink_buffers(sh, conf->pool_size); |
3f294f4f N |
1149 | kmem_cache_free(conf->slab_cache, sh); |
1150 | atomic_dec(&conf->active_stripes); | |
1151 | return 1; | |
1152 | } | |
1153 | ||
1154 | static void shrink_stripes(raid5_conf_t *conf) | |
1155 | { | |
1156 | while (drop_one_stripe(conf)) | |
1157 | ; | |
1158 | ||
29fc7e3e N |
1159 | if (conf->slab_cache) |
1160 | kmem_cache_destroy(conf->slab_cache); | |
1da177e4 LT |
1161 | conf->slab_cache = NULL; |
1162 | } | |
1163 | ||
6712ecf8 | 1164 | static void raid5_end_read_request(struct bio * bi, int error) |
1da177e4 | 1165 | { |
99c0fb5f | 1166 | struct stripe_head *sh = bi->bi_private; |
1da177e4 | 1167 | raid5_conf_t *conf = sh->raid_conf; |
7ecaa1e6 | 1168 | int disks = sh->disks, i; |
1da177e4 | 1169 | int uptodate = test_bit(BIO_UPTODATE, &bi->bi_flags); |
d6950432 N |
1170 | char b[BDEVNAME_SIZE]; |
1171 | mdk_rdev_t *rdev; | |
1da177e4 | 1172 | |
1da177e4 LT |
1173 | |
1174 | for (i=0 ; i<disks; i++) | |
1175 | if (bi == &sh->dev[i].req) | |
1176 | break; | |
1177 | ||
45b4233c DW |
1178 | pr_debug("end_read_request %llu/%d, count: %d, uptodate %d.\n", |
1179 | (unsigned long long)sh->sector, i, atomic_read(&sh->count), | |
1da177e4 LT |
1180 | uptodate); |
1181 | if (i == disks) { | |
1182 | BUG(); | |
6712ecf8 | 1183 | return; |
1da177e4 LT |
1184 | } |
1185 | ||
1186 | if (uptodate) { | |
1da177e4 | 1187 | set_bit(R5_UPTODATE, &sh->dev[i].flags); |
4e5314b5 | 1188 | if (test_bit(R5_ReadError, &sh->dev[i].flags)) { |
d6950432 | 1189 | rdev = conf->disks[i].rdev; |
6be9d494 BS |
1190 | printk_rl(KERN_INFO "raid5:%s: read error corrected" |
1191 | " (%lu sectors at %llu on %s)\n", | |
1192 | mdname(conf->mddev), STRIPE_SECTORS, | |
1193 | (unsigned long long)(sh->sector | |
1194 | + rdev->data_offset), | |
1195 | bdevname(rdev->bdev, b)); | |
4e5314b5 N |
1196 | clear_bit(R5_ReadError, &sh->dev[i].flags); |
1197 | clear_bit(R5_ReWrite, &sh->dev[i].flags); | |
1198 | } | |
ba22dcbf N |
1199 | if (atomic_read(&conf->disks[i].rdev->read_errors)) |
1200 | atomic_set(&conf->disks[i].rdev->read_errors, 0); | |
1da177e4 | 1201 | } else { |
d6950432 | 1202 | const char *bdn = bdevname(conf->disks[i].rdev->bdev, b); |
ba22dcbf | 1203 | int retry = 0; |
d6950432 N |
1204 | rdev = conf->disks[i].rdev; |
1205 | ||
1da177e4 | 1206 | clear_bit(R5_UPTODATE, &sh->dev[i].flags); |
d6950432 | 1207 | atomic_inc(&rdev->read_errors); |
ba22dcbf | 1208 | if (conf->mddev->degraded) |
6be9d494 BS |
1209 | printk_rl(KERN_WARNING |
1210 | "raid5:%s: read error not correctable " | |
1211 | "(sector %llu on %s).\n", | |
1212 | mdname(conf->mddev), | |
1213 | (unsigned long long)(sh->sector | |
1214 | + rdev->data_offset), | |
1215 | bdn); | |
ba22dcbf | 1216 | else if (test_bit(R5_ReWrite, &sh->dev[i].flags)) |
4e5314b5 | 1217 | /* Oh, no!!! */ |
6be9d494 BS |
1218 | printk_rl(KERN_WARNING |
1219 | "raid5:%s: read error NOT corrected!! " | |
1220 | "(sector %llu on %s).\n", | |
1221 | mdname(conf->mddev), | |
1222 | (unsigned long long)(sh->sector | |
1223 | + rdev->data_offset), | |
1224 | bdn); | |
d6950432 | 1225 | else if (atomic_read(&rdev->read_errors) |
ba22dcbf | 1226 | > conf->max_nr_stripes) |
14f8d26b | 1227 | printk(KERN_WARNING |
d6950432 N |
1228 | "raid5:%s: Too many read errors, failing device %s.\n", |
1229 | mdname(conf->mddev), bdn); | |
ba22dcbf N |
1230 | else |
1231 | retry = 1; | |
1232 | if (retry) | |
1233 | set_bit(R5_ReadError, &sh->dev[i].flags); | |
1234 | else { | |
4e5314b5 N |
1235 | clear_bit(R5_ReadError, &sh->dev[i].flags); |
1236 | clear_bit(R5_ReWrite, &sh->dev[i].flags); | |
d6950432 | 1237 | md_error(conf->mddev, rdev); |
ba22dcbf | 1238 | } |
1da177e4 LT |
1239 | } |
1240 | rdev_dec_pending(conf->disks[i].rdev, conf->mddev); | |
1da177e4 LT |
1241 | clear_bit(R5_LOCKED, &sh->dev[i].flags); |
1242 | set_bit(STRIPE_HANDLE, &sh->state); | |
1243 | release_stripe(sh); | |
1da177e4 LT |
1244 | } |
1245 | ||
d710e138 | 1246 | static void raid5_end_write_request(struct bio *bi, int error) |
1da177e4 | 1247 | { |
99c0fb5f | 1248 | struct stripe_head *sh = bi->bi_private; |
1da177e4 | 1249 | raid5_conf_t *conf = sh->raid_conf; |
7ecaa1e6 | 1250 | int disks = sh->disks, i; |
1da177e4 LT |
1251 | int uptodate = test_bit(BIO_UPTODATE, &bi->bi_flags); |
1252 | ||
1da177e4 LT |
1253 | for (i=0 ; i<disks; i++) |
1254 | if (bi == &sh->dev[i].req) | |
1255 | break; | |
1256 | ||
45b4233c | 1257 | pr_debug("end_write_request %llu/%d, count %d, uptodate: %d.\n", |
1da177e4 LT |
1258 | (unsigned long long)sh->sector, i, atomic_read(&sh->count), |
1259 | uptodate); | |
1260 | if (i == disks) { | |
1261 | BUG(); | |
6712ecf8 | 1262 | return; |
1da177e4 LT |
1263 | } |
1264 | ||
1da177e4 LT |
1265 | if (!uptodate) |
1266 | md_error(conf->mddev, conf->disks[i].rdev); | |
1267 | ||
1268 | rdev_dec_pending(conf->disks[i].rdev, conf->mddev); | |
1269 | ||
1270 | clear_bit(R5_LOCKED, &sh->dev[i].flags); | |
1271 | set_bit(STRIPE_HANDLE, &sh->state); | |
c04be0aa | 1272 | release_stripe(sh); |
1da177e4 LT |
1273 | } |
1274 | ||
1275 | ||
784052ec | 1276 | static sector_t compute_blocknr(struct stripe_head *sh, int i, int previous); |
1da177e4 | 1277 | |
784052ec | 1278 | static void raid5_build_block(struct stripe_head *sh, int i, int previous) |
1da177e4 LT |
1279 | { |
1280 | struct r5dev *dev = &sh->dev[i]; | |
1281 | ||
1282 | bio_init(&dev->req); | |
1283 | dev->req.bi_io_vec = &dev->vec; | |
1284 | dev->req.bi_vcnt++; | |
1285 | dev->req.bi_max_vecs++; | |
1286 | dev->vec.bv_page = dev->page; | |
1287 | dev->vec.bv_len = STRIPE_SIZE; | |
1288 | dev->vec.bv_offset = 0; | |
1289 | ||
1290 | dev->req.bi_sector = sh->sector; | |
1291 | dev->req.bi_private = sh; | |
1292 | ||
1293 | dev->flags = 0; | |
784052ec | 1294 | dev->sector = compute_blocknr(sh, i, previous); |
1da177e4 LT |
1295 | } |
1296 | ||
1297 | static void error(mddev_t *mddev, mdk_rdev_t *rdev) | |
1298 | { | |
1299 | char b[BDEVNAME_SIZE]; | |
1300 | raid5_conf_t *conf = (raid5_conf_t *) mddev->private; | |
45b4233c | 1301 | pr_debug("raid5: error called\n"); |
1da177e4 | 1302 | |
b2d444d7 | 1303 | if (!test_bit(Faulty, &rdev->flags)) { |
850b2b42 | 1304 | set_bit(MD_CHANGE_DEVS, &mddev->flags); |
c04be0aa N |
1305 | if (test_and_clear_bit(In_sync, &rdev->flags)) { |
1306 | unsigned long flags; | |
1307 | spin_lock_irqsave(&conf->device_lock, flags); | |
1da177e4 | 1308 | mddev->degraded++; |
c04be0aa | 1309 | spin_unlock_irqrestore(&conf->device_lock, flags); |
1da177e4 LT |
1310 | /* |
1311 | * if recovery was running, make sure it aborts. | |
1312 | */ | |
dfc70645 | 1313 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); |
1da177e4 | 1314 | } |
b2d444d7 | 1315 | set_bit(Faulty, &rdev->flags); |
d710e138 N |
1316 | printk(KERN_ALERT |
1317 | "raid5: Disk failure on %s, disabling device.\n" | |
1318 | "raid5: Operation continuing on %d devices.\n", | |
1319 | bdevname(rdev->bdev,b), conf->raid_disks - mddev->degraded); | |
1da177e4 | 1320 | } |
16a53ecc | 1321 | } |
1da177e4 LT |
1322 | |
1323 | /* | |
1324 | * Input: a 'big' sector number, | |
1325 | * Output: index of the data and parity disk, and the sector # in them. | |
1326 | */ | |
112bf897 | 1327 | static sector_t raid5_compute_sector(raid5_conf_t *conf, sector_t r_sector, |
911d4ee8 N |
1328 | int previous, int *dd_idx, |
1329 | struct stripe_head *sh) | |
1da177e4 LT |
1330 | { |
1331 | long stripe; | |
1332 | unsigned long chunk_number; | |
1333 | unsigned int chunk_offset; | |
911d4ee8 | 1334 | int pd_idx, qd_idx; |
67cc2b81 | 1335 | int ddf_layout = 0; |
1da177e4 | 1336 | sector_t new_sector; |
e183eaed N |
1337 | int algorithm = previous ? conf->prev_algo |
1338 | : conf->algorithm; | |
784052ec N |
1339 | int sectors_per_chunk = previous ? (conf->prev_chunk >> 9) |
1340 | : (conf->chunk_size >> 9); | |
112bf897 N |
1341 | int raid_disks = previous ? conf->previous_raid_disks |
1342 | : conf->raid_disks; | |
1343 | int data_disks = raid_disks - conf->max_degraded; | |
1da177e4 LT |
1344 | |
1345 | /* First compute the information on this sector */ | |
1346 | ||
1347 | /* | |
1348 | * Compute the chunk number and the sector offset inside the chunk | |
1349 | */ | |
1350 | chunk_offset = sector_div(r_sector, sectors_per_chunk); | |
1351 | chunk_number = r_sector; | |
1352 | BUG_ON(r_sector != chunk_number); | |
1353 | ||
1354 | /* | |
1355 | * Compute the stripe number | |
1356 | */ | |
1357 | stripe = chunk_number / data_disks; | |
1358 | ||
1359 | /* | |
1360 | * Compute the data disk and parity disk indexes inside the stripe | |
1361 | */ | |
1362 | *dd_idx = chunk_number % data_disks; | |
1363 | ||
1364 | /* | |
1365 | * Select the parity disk based on the user selected algorithm. | |
1366 | */ | |
911d4ee8 | 1367 | pd_idx = qd_idx = ~0; |
16a53ecc N |
1368 | switch(conf->level) { |
1369 | case 4: | |
911d4ee8 | 1370 | pd_idx = data_disks; |
16a53ecc N |
1371 | break; |
1372 | case 5: | |
e183eaed | 1373 | switch (algorithm) { |
1da177e4 | 1374 | case ALGORITHM_LEFT_ASYMMETRIC: |
911d4ee8 N |
1375 | pd_idx = data_disks - stripe % raid_disks; |
1376 | if (*dd_idx >= pd_idx) | |
1da177e4 LT |
1377 | (*dd_idx)++; |
1378 | break; | |
1379 | case ALGORITHM_RIGHT_ASYMMETRIC: | |
911d4ee8 N |
1380 | pd_idx = stripe % raid_disks; |
1381 | if (*dd_idx >= pd_idx) | |
1da177e4 LT |
1382 | (*dd_idx)++; |
1383 | break; | |
1384 | case ALGORITHM_LEFT_SYMMETRIC: | |
911d4ee8 N |
1385 | pd_idx = data_disks - stripe % raid_disks; |
1386 | *dd_idx = (pd_idx + 1 + *dd_idx) % raid_disks; | |
1da177e4 LT |
1387 | break; |
1388 | case ALGORITHM_RIGHT_SYMMETRIC: | |
911d4ee8 N |
1389 | pd_idx = stripe % raid_disks; |
1390 | *dd_idx = (pd_idx + 1 + *dd_idx) % raid_disks; | |
1da177e4 | 1391 | break; |
99c0fb5f N |
1392 | case ALGORITHM_PARITY_0: |
1393 | pd_idx = 0; | |
1394 | (*dd_idx)++; | |
1395 | break; | |
1396 | case ALGORITHM_PARITY_N: | |
1397 | pd_idx = data_disks; | |
1398 | break; | |
1da177e4 | 1399 | default: |
14f8d26b | 1400 | printk(KERN_ERR "raid5: unsupported algorithm %d\n", |
e183eaed | 1401 | algorithm); |
99c0fb5f | 1402 | BUG(); |
16a53ecc N |
1403 | } |
1404 | break; | |
1405 | case 6: | |
1406 | ||
e183eaed | 1407 | switch (algorithm) { |
16a53ecc | 1408 | case ALGORITHM_LEFT_ASYMMETRIC: |
911d4ee8 N |
1409 | pd_idx = raid_disks - 1 - (stripe % raid_disks); |
1410 | qd_idx = pd_idx + 1; | |
1411 | if (pd_idx == raid_disks-1) { | |
99c0fb5f | 1412 | (*dd_idx)++; /* Q D D D P */ |
911d4ee8 N |
1413 | qd_idx = 0; |
1414 | } else if (*dd_idx >= pd_idx) | |
16a53ecc N |
1415 | (*dd_idx) += 2; /* D D P Q D */ |
1416 | break; | |
1417 | case ALGORITHM_RIGHT_ASYMMETRIC: | |
911d4ee8 N |
1418 | pd_idx = stripe % raid_disks; |
1419 | qd_idx = pd_idx + 1; | |
1420 | if (pd_idx == raid_disks-1) { | |
99c0fb5f | 1421 | (*dd_idx)++; /* Q D D D P */ |
911d4ee8 N |
1422 | qd_idx = 0; |
1423 | } else if (*dd_idx >= pd_idx) | |
16a53ecc N |
1424 | (*dd_idx) += 2; /* D D P Q D */ |
1425 | break; | |
1426 | case ALGORITHM_LEFT_SYMMETRIC: | |
911d4ee8 N |
1427 | pd_idx = raid_disks - 1 - (stripe % raid_disks); |
1428 | qd_idx = (pd_idx + 1) % raid_disks; | |
1429 | *dd_idx = (pd_idx + 2 + *dd_idx) % raid_disks; | |
16a53ecc N |
1430 | break; |
1431 | case ALGORITHM_RIGHT_SYMMETRIC: | |
911d4ee8 N |
1432 | pd_idx = stripe % raid_disks; |
1433 | qd_idx = (pd_idx + 1) % raid_disks; | |
1434 | *dd_idx = (pd_idx + 2 + *dd_idx) % raid_disks; | |
16a53ecc | 1435 | break; |
99c0fb5f N |
1436 | |
1437 | case ALGORITHM_PARITY_0: | |
1438 | pd_idx = 0; | |
1439 | qd_idx = 1; | |
1440 | (*dd_idx) += 2; | |
1441 | break; | |
1442 | case ALGORITHM_PARITY_N: | |
1443 | pd_idx = data_disks; | |
1444 | qd_idx = data_disks + 1; | |
1445 | break; | |
1446 | ||
1447 | case ALGORITHM_ROTATING_ZERO_RESTART: | |
1448 | /* Exactly the same as RIGHT_ASYMMETRIC, but or | |
1449 | * of blocks for computing Q is different. | |
1450 | */ | |
1451 | pd_idx = stripe % raid_disks; | |
1452 | qd_idx = pd_idx + 1; | |
1453 | if (pd_idx == raid_disks-1) { | |
1454 | (*dd_idx)++; /* Q D D D P */ | |
1455 | qd_idx = 0; | |
1456 | } else if (*dd_idx >= pd_idx) | |
1457 | (*dd_idx) += 2; /* D D P Q D */ | |
67cc2b81 | 1458 | ddf_layout = 1; |
99c0fb5f N |
1459 | break; |
1460 | ||
1461 | case ALGORITHM_ROTATING_N_RESTART: | |
1462 | /* Same a left_asymmetric, by first stripe is | |
1463 | * D D D P Q rather than | |
1464 | * Q D D D P | |
1465 | */ | |
1466 | pd_idx = raid_disks - 1 - ((stripe + 1) % raid_disks); | |
1467 | qd_idx = pd_idx + 1; | |
1468 | if (pd_idx == raid_disks-1) { | |
1469 | (*dd_idx)++; /* Q D D D P */ | |
1470 | qd_idx = 0; | |
1471 | } else if (*dd_idx >= pd_idx) | |
1472 | (*dd_idx) += 2; /* D D P Q D */ | |
67cc2b81 | 1473 | ddf_layout = 1; |
99c0fb5f N |
1474 | break; |
1475 | ||
1476 | case ALGORITHM_ROTATING_N_CONTINUE: | |
1477 | /* Same as left_symmetric but Q is before P */ | |
1478 | pd_idx = raid_disks - 1 - (stripe % raid_disks); | |
1479 | qd_idx = (pd_idx + raid_disks - 1) % raid_disks; | |
1480 | *dd_idx = (pd_idx + 1 + *dd_idx) % raid_disks; | |
67cc2b81 | 1481 | ddf_layout = 1; |
99c0fb5f N |
1482 | break; |
1483 | ||
1484 | case ALGORITHM_LEFT_ASYMMETRIC_6: | |
1485 | /* RAID5 left_asymmetric, with Q on last device */ | |
1486 | pd_idx = data_disks - stripe % (raid_disks-1); | |
1487 | if (*dd_idx >= pd_idx) | |
1488 | (*dd_idx)++; | |
1489 | qd_idx = raid_disks - 1; | |
1490 | break; | |
1491 | ||
1492 | case ALGORITHM_RIGHT_ASYMMETRIC_6: | |
1493 | pd_idx = stripe % (raid_disks-1); | |
1494 | if (*dd_idx >= pd_idx) | |
1495 | (*dd_idx)++; | |
1496 | qd_idx = raid_disks - 1; | |
1497 | break; | |
1498 | ||
1499 | case ALGORITHM_LEFT_SYMMETRIC_6: | |
1500 | pd_idx = data_disks - stripe % (raid_disks-1); | |
1501 | *dd_idx = (pd_idx + 1 + *dd_idx) % (raid_disks-1); | |
1502 | qd_idx = raid_disks - 1; | |
1503 | break; | |
1504 | ||
1505 | case ALGORITHM_RIGHT_SYMMETRIC_6: | |
1506 | pd_idx = stripe % (raid_disks-1); | |
1507 | *dd_idx = (pd_idx + 1 + *dd_idx) % (raid_disks-1); | |
1508 | qd_idx = raid_disks - 1; | |
1509 | break; | |
1510 | ||
1511 | case ALGORITHM_PARITY_0_6: | |
1512 | pd_idx = 0; | |
1513 | (*dd_idx)++; | |
1514 | qd_idx = raid_disks - 1; | |
1515 | break; | |
1516 | ||
1517 | ||
16a53ecc | 1518 | default: |
d710e138 | 1519 | printk(KERN_CRIT "raid6: unsupported algorithm %d\n", |
e183eaed | 1520 | algorithm); |
99c0fb5f | 1521 | BUG(); |
16a53ecc N |
1522 | } |
1523 | break; | |
1da177e4 LT |
1524 | } |
1525 | ||
911d4ee8 N |
1526 | if (sh) { |
1527 | sh->pd_idx = pd_idx; | |
1528 | sh->qd_idx = qd_idx; | |
67cc2b81 | 1529 | sh->ddf_layout = ddf_layout; |
911d4ee8 | 1530 | } |
1da177e4 LT |
1531 | /* |
1532 | * Finally, compute the new sector number | |
1533 | */ | |
1534 | new_sector = (sector_t)stripe * sectors_per_chunk + chunk_offset; | |
1535 | return new_sector; | |
1536 | } | |
1537 | ||
1538 | ||
784052ec | 1539 | static sector_t compute_blocknr(struct stripe_head *sh, int i, int previous) |
1da177e4 LT |
1540 | { |
1541 | raid5_conf_t *conf = sh->raid_conf; | |
b875e531 N |
1542 | int raid_disks = sh->disks; |
1543 | int data_disks = raid_disks - conf->max_degraded; | |
1da177e4 | 1544 | sector_t new_sector = sh->sector, check; |
784052ec N |
1545 | int sectors_per_chunk = previous ? (conf->prev_chunk >> 9) |
1546 | : (conf->chunk_size >> 9); | |
e183eaed N |
1547 | int algorithm = previous ? conf->prev_algo |
1548 | : conf->algorithm; | |
1da177e4 LT |
1549 | sector_t stripe; |
1550 | int chunk_offset; | |
911d4ee8 | 1551 | int chunk_number, dummy1, dd_idx = i; |
1da177e4 | 1552 | sector_t r_sector; |
911d4ee8 | 1553 | struct stripe_head sh2; |
1da177e4 | 1554 | |
16a53ecc | 1555 | |
1da177e4 LT |
1556 | chunk_offset = sector_div(new_sector, sectors_per_chunk); |
1557 | stripe = new_sector; | |
1558 | BUG_ON(new_sector != stripe); | |
1559 | ||
16a53ecc N |
1560 | if (i == sh->pd_idx) |
1561 | return 0; | |
1562 | switch(conf->level) { | |
1563 | case 4: break; | |
1564 | case 5: | |
e183eaed | 1565 | switch (algorithm) { |
1da177e4 LT |
1566 | case ALGORITHM_LEFT_ASYMMETRIC: |
1567 | case ALGORITHM_RIGHT_ASYMMETRIC: | |
1568 | if (i > sh->pd_idx) | |
1569 | i--; | |
1570 | break; | |
1571 | case ALGORITHM_LEFT_SYMMETRIC: | |
1572 | case ALGORITHM_RIGHT_SYMMETRIC: | |
1573 | if (i < sh->pd_idx) | |
1574 | i += raid_disks; | |
1575 | i -= (sh->pd_idx + 1); | |
1576 | break; | |
99c0fb5f N |
1577 | case ALGORITHM_PARITY_0: |
1578 | i -= 1; | |
1579 | break; | |
1580 | case ALGORITHM_PARITY_N: | |
1581 | break; | |
1da177e4 | 1582 | default: |
14f8d26b | 1583 | printk(KERN_ERR "raid5: unsupported algorithm %d\n", |
e183eaed | 1584 | algorithm); |
99c0fb5f | 1585 | BUG(); |
16a53ecc N |
1586 | } |
1587 | break; | |
1588 | case 6: | |
d0dabf7e | 1589 | if (i == sh->qd_idx) |
16a53ecc | 1590 | return 0; /* It is the Q disk */ |
e183eaed | 1591 | switch (algorithm) { |
16a53ecc N |
1592 | case ALGORITHM_LEFT_ASYMMETRIC: |
1593 | case ALGORITHM_RIGHT_ASYMMETRIC: | |
99c0fb5f N |
1594 | case ALGORITHM_ROTATING_ZERO_RESTART: |
1595 | case ALGORITHM_ROTATING_N_RESTART: | |
1596 | if (sh->pd_idx == raid_disks-1) | |
1597 | i--; /* Q D D D P */ | |
16a53ecc N |
1598 | else if (i > sh->pd_idx) |
1599 | i -= 2; /* D D P Q D */ | |
1600 | break; | |
1601 | case ALGORITHM_LEFT_SYMMETRIC: | |
1602 | case ALGORITHM_RIGHT_SYMMETRIC: | |
1603 | if (sh->pd_idx == raid_disks-1) | |
1604 | i--; /* Q D D D P */ | |
1605 | else { | |
1606 | /* D D P Q D */ | |
1607 | if (i < sh->pd_idx) | |
1608 | i += raid_disks; | |
1609 | i -= (sh->pd_idx + 2); | |
1610 | } | |
1611 | break; | |
99c0fb5f N |
1612 | case ALGORITHM_PARITY_0: |
1613 | i -= 2; | |
1614 | break; | |
1615 | case ALGORITHM_PARITY_N: | |
1616 | break; | |
1617 | case ALGORITHM_ROTATING_N_CONTINUE: | |
1618 | if (sh->pd_idx == 0) | |
1619 | i--; /* P D D D Q */ | |
1620 | else if (i > sh->pd_idx) | |
1621 | i -= 2; /* D D Q P D */ | |
1622 | break; | |
1623 | case ALGORITHM_LEFT_ASYMMETRIC_6: | |
1624 | case ALGORITHM_RIGHT_ASYMMETRIC_6: | |
1625 | if (i > sh->pd_idx) | |
1626 | i--; | |
1627 | break; | |
1628 | case ALGORITHM_LEFT_SYMMETRIC_6: | |
1629 | case ALGORITHM_RIGHT_SYMMETRIC_6: | |
1630 | if (i < sh->pd_idx) | |
1631 | i += data_disks + 1; | |
1632 | i -= (sh->pd_idx + 1); | |
1633 | break; | |
1634 | case ALGORITHM_PARITY_0_6: | |
1635 | i -= 1; | |
1636 | break; | |
16a53ecc | 1637 | default: |
d710e138 | 1638 | printk(KERN_CRIT "raid6: unsupported algorithm %d\n", |
e183eaed | 1639 | algorithm); |
99c0fb5f | 1640 | BUG(); |
16a53ecc N |
1641 | } |
1642 | break; | |
1da177e4 LT |
1643 | } |
1644 | ||
1645 | chunk_number = stripe * data_disks + i; | |
1646 | r_sector = (sector_t)chunk_number * sectors_per_chunk + chunk_offset; | |
1647 | ||
112bf897 | 1648 | check = raid5_compute_sector(conf, r_sector, |
784052ec | 1649 | previous, &dummy1, &sh2); |
911d4ee8 N |
1650 | if (check != sh->sector || dummy1 != dd_idx || sh2.pd_idx != sh->pd_idx |
1651 | || sh2.qd_idx != sh->qd_idx) { | |
14f8d26b | 1652 | printk(KERN_ERR "compute_blocknr: map not correct\n"); |
1da177e4 LT |
1653 | return 0; |
1654 | } | |
1655 | return r_sector; | |
1656 | } | |
1657 | ||
1658 | ||
1659 | ||
1660 | /* | |
16a53ecc N |
1661 | * Copy data between a page in the stripe cache, and one or more bion |
1662 | * The page could align with the middle of the bio, or there could be | |
1663 | * several bion, each with several bio_vecs, which cover part of the page | |
1664 | * Multiple bion are linked together on bi_next. There may be extras | |
1665 | * at the end of this list. We ignore them. | |
1da177e4 LT |
1666 | */ |
1667 | static void copy_data(int frombio, struct bio *bio, | |
1668 | struct page *page, | |
1669 | sector_t sector) | |
1670 | { | |
1671 | char *pa = page_address(page); | |
1672 | struct bio_vec *bvl; | |
1673 | int i; | |
1674 | int page_offset; | |
1675 | ||
1676 | if (bio->bi_sector >= sector) | |
1677 | page_offset = (signed)(bio->bi_sector - sector) * 512; | |
1678 | else | |
1679 | page_offset = (signed)(sector - bio->bi_sector) * -512; | |
1680 | bio_for_each_segment(bvl, bio, i) { | |
1681 | int len = bio_iovec_idx(bio,i)->bv_len; | |
1682 | int clen; | |
1683 | int b_offset = 0; | |
1684 | ||
1685 | if (page_offset < 0) { | |
1686 | b_offset = -page_offset; | |
1687 | page_offset += b_offset; | |
1688 | len -= b_offset; | |
1689 | } | |
1690 | ||
1691 | if (len > 0 && page_offset + len > STRIPE_SIZE) | |
1692 | clen = STRIPE_SIZE - page_offset; | |
1693 | else clen = len; | |
16a53ecc | 1694 | |
1da177e4 LT |
1695 | if (clen > 0) { |
1696 | char *ba = __bio_kmap_atomic(bio, i, KM_USER0); | |
1697 | if (frombio) | |
1698 | memcpy(pa+page_offset, ba+b_offset, clen); | |
1699 | else | |
1700 | memcpy(ba+b_offset, pa+page_offset, clen); | |
1701 | __bio_kunmap_atomic(ba, KM_USER0); | |
1702 | } | |
1703 | if (clen < len) /* hit end of page */ | |
1704 | break; | |
1705 | page_offset += len; | |
1706 | } | |
1707 | } | |
1708 | ||
9bc89cd8 DW |
1709 | #define check_xor() do { \ |
1710 | if (count == MAX_XOR_BLOCKS) { \ | |
1711 | xor_blocks(count, STRIPE_SIZE, dest, ptr);\ | |
1712 | count = 0; \ | |
1713 | } \ | |
1da177e4 LT |
1714 | } while(0) |
1715 | ||
16a53ecc N |
1716 | static void compute_parity6(struct stripe_head *sh, int method) |
1717 | { | |
bff61975 | 1718 | raid5_conf_t *conf = sh->raid_conf; |
d0dabf7e | 1719 | int i, pd_idx, qd_idx, d0_idx, disks = sh->disks, count; |
67cc2b81 | 1720 | int syndrome_disks = sh->ddf_layout ? disks : (disks - 2); |
16a53ecc N |
1721 | struct bio *chosen; |
1722 | /**** FIX THIS: This could be very bad if disks is close to 256 ****/ | |
67cc2b81 | 1723 | void *ptrs[syndrome_disks+2]; |
16a53ecc | 1724 | |
d0dabf7e N |
1725 | pd_idx = sh->pd_idx; |
1726 | qd_idx = sh->qd_idx; | |
1727 | d0_idx = raid6_d0(sh); | |
16a53ecc | 1728 | |
45b4233c | 1729 | pr_debug("compute_parity, stripe %llu, method %d\n", |
16a53ecc N |
1730 | (unsigned long long)sh->sector, method); |
1731 | ||
1732 | switch(method) { | |
1733 | case READ_MODIFY_WRITE: | |
1734 | BUG(); /* READ_MODIFY_WRITE N/A for RAID-6 */ | |
1735 | case RECONSTRUCT_WRITE: | |
1736 | for (i= disks; i-- ;) | |
1737 | if ( i != pd_idx && i != qd_idx && sh->dev[i].towrite ) { | |
1738 | chosen = sh->dev[i].towrite; | |
1739 | sh->dev[i].towrite = NULL; | |
1740 | ||
1741 | if (test_and_clear_bit(R5_Overlap, &sh->dev[i].flags)) | |
1742 | wake_up(&conf->wait_for_overlap); | |
1743 | ||
52e5f9d1 | 1744 | BUG_ON(sh->dev[i].written); |
16a53ecc N |
1745 | sh->dev[i].written = chosen; |
1746 | } | |
1747 | break; | |
1748 | case CHECK_PARITY: | |
1749 | BUG(); /* Not implemented yet */ | |
1750 | } | |
1751 | ||
1752 | for (i = disks; i--;) | |
1753 | if (sh->dev[i].written) { | |
1754 | sector_t sector = sh->dev[i].sector; | |
1755 | struct bio *wbi = sh->dev[i].written; | |
1756 | while (wbi && wbi->bi_sector < sector + STRIPE_SECTORS) { | |
1757 | copy_data(1, wbi, sh->dev[i].page, sector); | |
1758 | wbi = r5_next_bio(wbi, sector); | |
1759 | } | |
1760 | ||
1761 | set_bit(R5_LOCKED, &sh->dev[i].flags); | |
1762 | set_bit(R5_UPTODATE, &sh->dev[i].flags); | |
1763 | } | |
1764 | ||
d0dabf7e | 1765 | /* Note that unlike RAID-5, the ordering of the disks matters greatly.*/ |
67cc2b81 N |
1766 | |
1767 | for (i = 0; i < disks; i++) | |
1768 | ptrs[i] = (void *)raid6_empty_zero_page; | |
1769 | ||
d0dabf7e N |
1770 | count = 0; |
1771 | i = d0_idx; | |
1772 | do { | |
67cc2b81 N |
1773 | int slot = raid6_idx_to_slot(i, sh, &count, syndrome_disks); |
1774 | ||
d0dabf7e | 1775 | ptrs[slot] = page_address(sh->dev[i].page); |
67cc2b81 | 1776 | if (slot < syndrome_disks && |
d0dabf7e N |
1777 | !test_bit(R5_UPTODATE, &sh->dev[i].flags)) { |
1778 | printk(KERN_ERR "block %d/%d not uptodate " | |
1779 | "on parity calc\n", i, count); | |
1780 | BUG(); | |
1781 | } | |
67cc2b81 | 1782 | |
d0dabf7e N |
1783 | i = raid6_next_disk(i, disks); |
1784 | } while (i != d0_idx); | |
67cc2b81 | 1785 | BUG_ON(count != syndrome_disks); |
16a53ecc | 1786 | |
67cc2b81 | 1787 | raid6_call.gen_syndrome(syndrome_disks+2, STRIPE_SIZE, ptrs); |
16a53ecc N |
1788 | |
1789 | switch(method) { | |
1790 | case RECONSTRUCT_WRITE: | |
1791 | set_bit(R5_UPTODATE, &sh->dev[pd_idx].flags); | |
1792 | set_bit(R5_UPTODATE, &sh->dev[qd_idx].flags); | |
1793 | set_bit(R5_LOCKED, &sh->dev[pd_idx].flags); | |
1794 | set_bit(R5_LOCKED, &sh->dev[qd_idx].flags); | |
1795 | break; | |
1796 | case UPDATE_PARITY: | |
1797 | set_bit(R5_UPTODATE, &sh->dev[pd_idx].flags); | |
1798 | set_bit(R5_UPTODATE, &sh->dev[qd_idx].flags); | |
1799 | break; | |
1800 | } | |
1801 | } | |
1802 | ||
1803 | ||
1804 | /* Compute one missing block */ | |
1805 | static void compute_block_1(struct stripe_head *sh, int dd_idx, int nozero) | |
1806 | { | |
f416885e | 1807 | int i, count, disks = sh->disks; |
9bc89cd8 | 1808 | void *ptr[MAX_XOR_BLOCKS], *dest, *p; |
d0dabf7e | 1809 | int qd_idx = sh->qd_idx; |
16a53ecc | 1810 | |
45b4233c | 1811 | pr_debug("compute_block_1, stripe %llu, idx %d\n", |
16a53ecc N |
1812 | (unsigned long long)sh->sector, dd_idx); |
1813 | ||
1814 | if ( dd_idx == qd_idx ) { | |
1815 | /* We're actually computing the Q drive */ | |
1816 | compute_parity6(sh, UPDATE_PARITY); | |
1817 | } else { | |
9bc89cd8 DW |
1818 | dest = page_address(sh->dev[dd_idx].page); |
1819 | if (!nozero) memset(dest, 0, STRIPE_SIZE); | |
1820 | count = 0; | |
16a53ecc N |
1821 | for (i = disks ; i--; ) { |
1822 | if (i == dd_idx || i == qd_idx) | |
1823 | continue; | |
1824 | p = page_address(sh->dev[i].page); | |
1825 | if (test_bit(R5_UPTODATE, &sh->dev[i].flags)) | |
1826 | ptr[count++] = p; | |
1827 | else | |
1828 | printk("compute_block() %d, stripe %llu, %d" | |
1829 | " not present\n", dd_idx, | |
1830 | (unsigned long long)sh->sector, i); | |
1831 | ||
1832 | check_xor(); | |
1833 | } | |
9bc89cd8 DW |
1834 | if (count) |
1835 | xor_blocks(count, STRIPE_SIZE, dest, ptr); | |
16a53ecc N |
1836 | if (!nozero) set_bit(R5_UPTODATE, &sh->dev[dd_idx].flags); |
1837 | else clear_bit(R5_UPTODATE, &sh->dev[dd_idx].flags); | |
1838 | } | |
1839 | } | |
1840 | ||
1841 | /* Compute two missing blocks */ | |
1842 | static void compute_block_2(struct stripe_head *sh, int dd_idx1, int dd_idx2) | |
1843 | { | |
f416885e | 1844 | int i, count, disks = sh->disks; |
67cc2b81 | 1845 | int syndrome_disks = sh->ddf_layout ? disks : disks-2; |
d0dabf7e N |
1846 | int d0_idx = raid6_d0(sh); |
1847 | int faila = -1, failb = -1; | |
1848 | /**** FIX THIS: This could be very bad if disks is close to 256 ****/ | |
67cc2b81 | 1849 | void *ptrs[syndrome_disks+2]; |
16a53ecc | 1850 | |
67cc2b81 N |
1851 | for (i = 0; i < disks ; i++) |
1852 | ptrs[i] = (void *)raid6_empty_zero_page; | |
d0dabf7e N |
1853 | count = 0; |
1854 | i = d0_idx; | |
1855 | do { | |
67cc2b81 N |
1856 | int slot = raid6_idx_to_slot(i, sh, &count, syndrome_disks); |
1857 | ||
d0dabf7e | 1858 | ptrs[slot] = page_address(sh->dev[i].page); |
67cc2b81 | 1859 | |
d0dabf7e N |
1860 | if (i == dd_idx1) |
1861 | faila = slot; | |
1862 | if (i == dd_idx2) | |
1863 | failb = slot; | |
1864 | i = raid6_next_disk(i, disks); | |
1865 | } while (i != d0_idx); | |
67cc2b81 | 1866 | BUG_ON(count != syndrome_disks); |
16a53ecc N |
1867 | |
1868 | BUG_ON(faila == failb); | |
1869 | if ( failb < faila ) { int tmp = faila; faila = failb; failb = tmp; } | |
1870 | ||
45b4233c | 1871 | pr_debug("compute_block_2, stripe %llu, idx %d,%d (%d,%d)\n", |
d0dabf7e N |
1872 | (unsigned long long)sh->sector, dd_idx1, dd_idx2, |
1873 | faila, failb); | |
16a53ecc | 1874 | |
67cc2b81 | 1875 | if (failb == syndrome_disks+1) { |
16a53ecc | 1876 | /* Q disk is one of the missing disks */ |
67cc2b81 | 1877 | if (faila == syndrome_disks) { |
16a53ecc N |
1878 | /* Missing P+Q, just recompute */ |
1879 | compute_parity6(sh, UPDATE_PARITY); | |
1880 | return; | |
1881 | } else { | |
1882 | /* We're missing D+Q; recompute D from P */ | |
d0dabf7e N |
1883 | compute_block_1(sh, ((dd_idx1 == sh->qd_idx) ? |
1884 | dd_idx2 : dd_idx1), | |
1885 | 0); | |
16a53ecc N |
1886 | compute_parity6(sh, UPDATE_PARITY); /* Is this necessary? */ |
1887 | return; | |
1888 | } | |
1889 | } | |
1890 | ||
d0dabf7e | 1891 | /* We're missing D+P or D+D; */ |
67cc2b81 | 1892 | if (failb == syndrome_disks) { |
d0dabf7e | 1893 | /* We're missing D+P. */ |
67cc2b81 | 1894 | raid6_datap_recov(syndrome_disks+2, STRIPE_SIZE, faila, ptrs); |
d0dabf7e N |
1895 | } else { |
1896 | /* We're missing D+D. */ | |
67cc2b81 N |
1897 | raid6_2data_recov(syndrome_disks+2, STRIPE_SIZE, faila, failb, |
1898 | ptrs); | |
16a53ecc | 1899 | } |
d0dabf7e N |
1900 | |
1901 | /* Both the above update both missing blocks */ | |
1902 | set_bit(R5_UPTODATE, &sh->dev[dd_idx1].flags); | |
1903 | set_bit(R5_UPTODATE, &sh->dev[dd_idx2].flags); | |
16a53ecc N |
1904 | } |
1905 | ||
600aa109 | 1906 | static void |
1fe797e6 | 1907 | schedule_reconstruction5(struct stripe_head *sh, struct stripe_head_state *s, |
600aa109 | 1908 | int rcw, int expand) |
e33129d8 DW |
1909 | { |
1910 | int i, pd_idx = sh->pd_idx, disks = sh->disks; | |
e33129d8 DW |
1911 | |
1912 | if (rcw) { | |
1913 | /* if we are not expanding this is a proper write request, and | |
1914 | * there will be bios with new data to be drained into the | |
1915 | * stripe cache | |
1916 | */ | |
1917 | if (!expand) { | |
600aa109 DW |
1918 | sh->reconstruct_state = reconstruct_state_drain_run; |
1919 | set_bit(STRIPE_OP_BIODRAIN, &s->ops_request); | |
1920 | } else | |
1921 | sh->reconstruct_state = reconstruct_state_run; | |
16a53ecc | 1922 | |
600aa109 | 1923 | set_bit(STRIPE_OP_POSTXOR, &s->ops_request); |
e33129d8 DW |
1924 | |
1925 | for (i = disks; i--; ) { | |
1926 | struct r5dev *dev = &sh->dev[i]; | |
1927 | ||
1928 | if (dev->towrite) { | |
1929 | set_bit(R5_LOCKED, &dev->flags); | |
d8ee0728 | 1930 | set_bit(R5_Wantdrain, &dev->flags); |
e33129d8 DW |
1931 | if (!expand) |
1932 | clear_bit(R5_UPTODATE, &dev->flags); | |
600aa109 | 1933 | s->locked++; |
e33129d8 DW |
1934 | } |
1935 | } | |
600aa109 | 1936 | if (s->locked + 1 == disks) |
8b3e6cdc DW |
1937 | if (!test_and_set_bit(STRIPE_FULL_WRITE, &sh->state)) |
1938 | atomic_inc(&sh->raid_conf->pending_full_writes); | |
e33129d8 DW |
1939 | } else { |
1940 | BUG_ON(!(test_bit(R5_UPTODATE, &sh->dev[pd_idx].flags) || | |
1941 | test_bit(R5_Wantcompute, &sh->dev[pd_idx].flags))); | |
1942 | ||
d8ee0728 | 1943 | sh->reconstruct_state = reconstruct_state_prexor_drain_run; |
600aa109 DW |
1944 | set_bit(STRIPE_OP_PREXOR, &s->ops_request); |
1945 | set_bit(STRIPE_OP_BIODRAIN, &s->ops_request); | |
1946 | set_bit(STRIPE_OP_POSTXOR, &s->ops_request); | |
e33129d8 DW |
1947 | |
1948 | for (i = disks; i--; ) { | |
1949 | struct r5dev *dev = &sh->dev[i]; | |
1950 | if (i == pd_idx) | |
1951 | continue; | |
1952 | ||
e33129d8 DW |
1953 | if (dev->towrite && |
1954 | (test_bit(R5_UPTODATE, &dev->flags) || | |
d8ee0728 DW |
1955 | test_bit(R5_Wantcompute, &dev->flags))) { |
1956 | set_bit(R5_Wantdrain, &dev->flags); | |
e33129d8 DW |
1957 | set_bit(R5_LOCKED, &dev->flags); |
1958 | clear_bit(R5_UPTODATE, &dev->flags); | |
600aa109 | 1959 | s->locked++; |
e33129d8 DW |
1960 | } |
1961 | } | |
1962 | } | |
1963 | ||
1964 | /* keep the parity disk locked while asynchronous operations | |
1965 | * are in flight | |
1966 | */ | |
1967 | set_bit(R5_LOCKED, &sh->dev[pd_idx].flags); | |
1968 | clear_bit(R5_UPTODATE, &sh->dev[pd_idx].flags); | |
600aa109 | 1969 | s->locked++; |
e33129d8 | 1970 | |
600aa109 | 1971 | pr_debug("%s: stripe %llu locked: %d ops_request: %lx\n", |
e46b272b | 1972 | __func__, (unsigned long long)sh->sector, |
600aa109 | 1973 | s->locked, s->ops_request); |
e33129d8 | 1974 | } |
16a53ecc | 1975 | |
1da177e4 LT |
1976 | /* |
1977 | * Each stripe/dev can have one or more bion attached. | |
16a53ecc | 1978 | * toread/towrite point to the first in a chain. |
1da177e4 LT |
1979 | * The bi_next chain must be in order. |
1980 | */ | |
1981 | static int add_stripe_bio(struct stripe_head *sh, struct bio *bi, int dd_idx, int forwrite) | |
1982 | { | |
1983 | struct bio **bip; | |
1984 | raid5_conf_t *conf = sh->raid_conf; | |
72626685 | 1985 | int firstwrite=0; |
1da177e4 | 1986 | |
45b4233c | 1987 | pr_debug("adding bh b#%llu to stripe s#%llu\n", |
1da177e4 LT |
1988 | (unsigned long long)bi->bi_sector, |
1989 | (unsigned long long)sh->sector); | |
1990 | ||
1991 | ||
1992 | spin_lock(&sh->lock); | |
1993 | spin_lock_irq(&conf->device_lock); | |
72626685 | 1994 | if (forwrite) { |
1da177e4 | 1995 | bip = &sh->dev[dd_idx].towrite; |
72626685 N |
1996 | if (*bip == NULL && sh->dev[dd_idx].written == NULL) |
1997 | firstwrite = 1; | |
1998 | } else | |
1da177e4 LT |
1999 | bip = &sh->dev[dd_idx].toread; |
2000 | while (*bip && (*bip)->bi_sector < bi->bi_sector) { | |
2001 | if ((*bip)->bi_sector + ((*bip)->bi_size >> 9) > bi->bi_sector) | |
2002 | goto overlap; | |
2003 | bip = & (*bip)->bi_next; | |
2004 | } | |
2005 | if (*bip && (*bip)->bi_sector < bi->bi_sector + ((bi->bi_size)>>9)) | |
2006 | goto overlap; | |
2007 | ||
78bafebd | 2008 | BUG_ON(*bip && bi->bi_next && (*bip) != bi->bi_next); |
1da177e4 LT |
2009 | if (*bip) |
2010 | bi->bi_next = *bip; | |
2011 | *bip = bi; | |
960e739d | 2012 | bi->bi_phys_segments++; |
1da177e4 LT |
2013 | spin_unlock_irq(&conf->device_lock); |
2014 | spin_unlock(&sh->lock); | |
2015 | ||
45b4233c | 2016 | pr_debug("added bi b#%llu to stripe s#%llu, disk %d.\n", |
1da177e4 LT |
2017 | (unsigned long long)bi->bi_sector, |
2018 | (unsigned long long)sh->sector, dd_idx); | |
2019 | ||
72626685 | 2020 | if (conf->mddev->bitmap && firstwrite) { |
72626685 N |
2021 | bitmap_startwrite(conf->mddev->bitmap, sh->sector, |
2022 | STRIPE_SECTORS, 0); | |
ae3c20cc | 2023 | sh->bm_seq = conf->seq_flush+1; |
72626685 N |
2024 | set_bit(STRIPE_BIT_DELAY, &sh->state); |
2025 | } | |
2026 | ||
1da177e4 LT |
2027 | if (forwrite) { |
2028 | /* check if page is covered */ | |
2029 | sector_t sector = sh->dev[dd_idx].sector; | |
2030 | for (bi=sh->dev[dd_idx].towrite; | |
2031 | sector < sh->dev[dd_idx].sector + STRIPE_SECTORS && | |
2032 | bi && bi->bi_sector <= sector; | |
2033 | bi = r5_next_bio(bi, sh->dev[dd_idx].sector)) { | |
2034 | if (bi->bi_sector + (bi->bi_size>>9) >= sector) | |
2035 | sector = bi->bi_sector + (bi->bi_size>>9); | |
2036 | } | |
2037 | if (sector >= sh->dev[dd_idx].sector + STRIPE_SECTORS) | |
2038 | set_bit(R5_OVERWRITE, &sh->dev[dd_idx].flags); | |
2039 | } | |
2040 | return 1; | |
2041 | ||
2042 | overlap: | |
2043 | set_bit(R5_Overlap, &sh->dev[dd_idx].flags); | |
2044 | spin_unlock_irq(&conf->device_lock); | |
2045 | spin_unlock(&sh->lock); | |
2046 | return 0; | |
2047 | } | |
2048 | ||
29269553 N |
2049 | static void end_reshape(raid5_conf_t *conf); |
2050 | ||
16a53ecc N |
2051 | static int page_is_zero(struct page *p) |
2052 | { | |
2053 | char *a = page_address(p); | |
2054 | return ((*(u32*)a) == 0 && | |
2055 | memcmp(a, a+4, STRIPE_SIZE-4)==0); | |
2056 | } | |
2057 | ||
911d4ee8 N |
2058 | static void stripe_set_idx(sector_t stripe, raid5_conf_t *conf, int previous, |
2059 | struct stripe_head *sh) | |
ccfcc3c1 | 2060 | { |
784052ec N |
2061 | int sectors_per_chunk = |
2062 | previous ? (conf->prev_chunk >> 9) | |
2063 | : (conf->chunk_size >> 9); | |
911d4ee8 | 2064 | int dd_idx; |
2d2063ce | 2065 | int chunk_offset = sector_div(stripe, sectors_per_chunk); |
112bf897 | 2066 | int disks = previous ? conf->previous_raid_disks : conf->raid_disks; |
2d2063ce | 2067 | |
112bf897 N |
2068 | raid5_compute_sector(conf, |
2069 | stripe * (disks - conf->max_degraded) | |
b875e531 | 2070 | *sectors_per_chunk + chunk_offset, |
112bf897 | 2071 | previous, |
911d4ee8 | 2072 | &dd_idx, sh); |
ccfcc3c1 N |
2073 | } |
2074 | ||
a4456856 | 2075 | static void |
1fe797e6 | 2076 | handle_failed_stripe(raid5_conf_t *conf, struct stripe_head *sh, |
a4456856 DW |
2077 | struct stripe_head_state *s, int disks, |
2078 | struct bio **return_bi) | |
2079 | { | |
2080 | int i; | |
2081 | for (i = disks; i--; ) { | |
2082 | struct bio *bi; | |
2083 | int bitmap_end = 0; | |
2084 | ||
2085 | if (test_bit(R5_ReadError, &sh->dev[i].flags)) { | |
2086 | mdk_rdev_t *rdev; | |
2087 | rcu_read_lock(); | |
2088 | rdev = rcu_dereference(conf->disks[i].rdev); | |
2089 | if (rdev && test_bit(In_sync, &rdev->flags)) | |
2090 | /* multiple read failures in one stripe */ | |
2091 | md_error(conf->mddev, rdev); | |
2092 | rcu_read_unlock(); | |
2093 | } | |
2094 | spin_lock_irq(&conf->device_lock); | |
2095 | /* fail all writes first */ | |
2096 | bi = sh->dev[i].towrite; | |
2097 | sh->dev[i].towrite = NULL; | |
2098 | if (bi) { | |
2099 | s->to_write--; | |
2100 | bitmap_end = 1; | |
2101 | } | |
2102 | ||
2103 | if (test_and_clear_bit(R5_Overlap, &sh->dev[i].flags)) | |
2104 | wake_up(&conf->wait_for_overlap); | |
2105 | ||
2106 | while (bi && bi->bi_sector < | |
2107 | sh->dev[i].sector + STRIPE_SECTORS) { | |
2108 | struct bio *nextbi = r5_next_bio(bi, sh->dev[i].sector); | |
2109 | clear_bit(BIO_UPTODATE, &bi->bi_flags); | |
960e739d | 2110 | if (!raid5_dec_bi_phys_segments(bi)) { |
a4456856 DW |
2111 | md_write_end(conf->mddev); |
2112 | bi->bi_next = *return_bi; | |
2113 | *return_bi = bi; | |
2114 | } | |
2115 | bi = nextbi; | |
2116 | } | |
2117 | /* and fail all 'written' */ | |
2118 | bi = sh->dev[i].written; | |
2119 | sh->dev[i].written = NULL; | |
2120 | if (bi) bitmap_end = 1; | |
2121 | while (bi && bi->bi_sector < | |
2122 | sh->dev[i].sector + STRIPE_SECTORS) { | |
2123 | struct bio *bi2 = r5_next_bio(bi, sh->dev[i].sector); | |
2124 | clear_bit(BIO_UPTODATE, &bi->bi_flags); | |
960e739d | 2125 | if (!raid5_dec_bi_phys_segments(bi)) { |
a4456856 DW |
2126 | md_write_end(conf->mddev); |
2127 | bi->bi_next = *return_bi; | |
2128 | *return_bi = bi; | |
2129 | } | |
2130 | bi = bi2; | |
2131 | } | |
2132 | ||
b5e98d65 DW |
2133 | /* fail any reads if this device is non-operational and |
2134 | * the data has not reached the cache yet. | |
2135 | */ | |
2136 | if (!test_bit(R5_Wantfill, &sh->dev[i].flags) && | |
2137 | (!test_bit(R5_Insync, &sh->dev[i].flags) || | |
2138 | test_bit(R5_ReadError, &sh->dev[i].flags))) { | |
a4456856 DW |
2139 | bi = sh->dev[i].toread; |
2140 | sh->dev[i].toread = NULL; | |
2141 | if (test_and_clear_bit(R5_Overlap, &sh->dev[i].flags)) | |
2142 | wake_up(&conf->wait_for_overlap); | |
2143 | if (bi) s->to_read--; | |
2144 | while (bi && bi->bi_sector < | |
2145 | sh->dev[i].sector + STRIPE_SECTORS) { | |
2146 | struct bio *nextbi = | |
2147 | r5_next_bio(bi, sh->dev[i].sector); | |
2148 | clear_bit(BIO_UPTODATE, &bi->bi_flags); | |
960e739d | 2149 | if (!raid5_dec_bi_phys_segments(bi)) { |
a4456856 DW |
2150 | bi->bi_next = *return_bi; |
2151 | *return_bi = bi; | |
2152 | } | |
2153 | bi = nextbi; | |
2154 | } | |
2155 | } | |
2156 | spin_unlock_irq(&conf->device_lock); | |
2157 | if (bitmap_end) | |
2158 | bitmap_endwrite(conf->mddev->bitmap, sh->sector, | |
2159 | STRIPE_SECTORS, 0, 0); | |
2160 | } | |
2161 | ||
8b3e6cdc DW |
2162 | if (test_and_clear_bit(STRIPE_FULL_WRITE, &sh->state)) |
2163 | if (atomic_dec_and_test(&conf->pending_full_writes)) | |
2164 | md_wakeup_thread(conf->mddev->thread); | |
a4456856 DW |
2165 | } |
2166 | ||
1fe797e6 DW |
2167 | /* fetch_block5 - checks the given member device to see if its data needs |
2168 | * to be read or computed to satisfy a request. | |
2169 | * | |
2170 | * Returns 1 when no more member devices need to be checked, otherwise returns | |
2171 | * 0 to tell the loop in handle_stripe_fill5 to continue | |
f38e1219 | 2172 | */ |
1fe797e6 DW |
2173 | static int fetch_block5(struct stripe_head *sh, struct stripe_head_state *s, |
2174 | int disk_idx, int disks) | |
f38e1219 DW |
2175 | { |
2176 | struct r5dev *dev = &sh->dev[disk_idx]; | |
2177 | struct r5dev *failed_dev = &sh->dev[s->failed_num]; | |
2178 | ||
f38e1219 DW |
2179 | /* is the data in this block needed, and can we get it? */ |
2180 | if (!test_bit(R5_LOCKED, &dev->flags) && | |
1fe797e6 DW |
2181 | !test_bit(R5_UPTODATE, &dev->flags) && |
2182 | (dev->toread || | |
2183 | (dev->towrite && !test_bit(R5_OVERWRITE, &dev->flags)) || | |
2184 | s->syncing || s->expanding || | |
2185 | (s->failed && | |
2186 | (failed_dev->toread || | |
2187 | (failed_dev->towrite && | |
2188 | !test_bit(R5_OVERWRITE, &failed_dev->flags)))))) { | |
976ea8d4 DW |
2189 | /* We would like to get this block, possibly by computing it, |
2190 | * otherwise read it if the backing disk is insync | |
f38e1219 DW |
2191 | */ |
2192 | if ((s->uptodate == disks - 1) && | |
ecc65c9b | 2193 | (s->failed && disk_idx == s->failed_num)) { |
976ea8d4 DW |
2194 | set_bit(STRIPE_COMPUTE_RUN, &sh->state); |
2195 | set_bit(STRIPE_OP_COMPUTE_BLK, &s->ops_request); | |
f38e1219 DW |
2196 | set_bit(R5_Wantcompute, &dev->flags); |
2197 | sh->ops.target = disk_idx; | |
2198 | s->req_compute = 1; | |
f38e1219 DW |
2199 | /* Careful: from this point on 'uptodate' is in the eye |
2200 | * of raid5_run_ops which services 'compute' operations | |
2201 | * before writes. R5_Wantcompute flags a block that will | |
2202 | * be R5_UPTODATE by the time it is needed for a | |
2203 | * subsequent operation. | |
2204 | */ | |
2205 | s->uptodate++; | |
1fe797e6 | 2206 | return 1; /* uptodate + compute == disks */ |
7a1fc53c | 2207 | } else if (test_bit(R5_Insync, &dev->flags)) { |
f38e1219 DW |
2208 | set_bit(R5_LOCKED, &dev->flags); |
2209 | set_bit(R5_Wantread, &dev->flags); | |
f38e1219 DW |
2210 | s->locked++; |
2211 | pr_debug("Reading block %d (sync=%d)\n", disk_idx, | |
2212 | s->syncing); | |
2213 | } | |
2214 | } | |
2215 | ||
1fe797e6 | 2216 | return 0; |
f38e1219 DW |
2217 | } |
2218 | ||
1fe797e6 DW |
2219 | /** |
2220 | * handle_stripe_fill5 - read or compute data to satisfy pending requests. | |
2221 | */ | |
2222 | static void handle_stripe_fill5(struct stripe_head *sh, | |
a4456856 DW |
2223 | struct stripe_head_state *s, int disks) |
2224 | { | |
2225 | int i; | |
f38e1219 | 2226 | |
f38e1219 DW |
2227 | /* look for blocks to read/compute, skip this if a compute |
2228 | * is already in flight, or if the stripe contents are in the | |
2229 | * midst of changing due to a write | |
2230 | */ | |
976ea8d4 | 2231 | if (!test_bit(STRIPE_COMPUTE_RUN, &sh->state) && !sh->check_state && |
1fe797e6 | 2232 | !sh->reconstruct_state) |
f38e1219 | 2233 | for (i = disks; i--; ) |
1fe797e6 | 2234 | if (fetch_block5(sh, s, i, disks)) |
f38e1219 | 2235 | break; |
a4456856 DW |
2236 | set_bit(STRIPE_HANDLE, &sh->state); |
2237 | } | |
2238 | ||
1fe797e6 | 2239 | static void handle_stripe_fill6(struct stripe_head *sh, |
a4456856 DW |
2240 | struct stripe_head_state *s, struct r6_state *r6s, |
2241 | int disks) | |
2242 | { | |
2243 | int i; | |
2244 | for (i = disks; i--; ) { | |
2245 | struct r5dev *dev = &sh->dev[i]; | |
2246 | if (!test_bit(R5_LOCKED, &dev->flags) && | |
2247 | !test_bit(R5_UPTODATE, &dev->flags) && | |
2248 | (dev->toread || (dev->towrite && | |
2249 | !test_bit(R5_OVERWRITE, &dev->flags)) || | |
2250 | s->syncing || s->expanding || | |
2251 | (s->failed >= 1 && | |
2252 | (sh->dev[r6s->failed_num[0]].toread || | |
2253 | s->to_write)) || | |
2254 | (s->failed >= 2 && | |
2255 | (sh->dev[r6s->failed_num[1]].toread || | |
2256 | s->to_write)))) { | |
2257 | /* we would like to get this block, possibly | |
2258 | * by computing it, but we might not be able to | |
2259 | */ | |
c337869d DW |
2260 | if ((s->uptodate == disks - 1) && |
2261 | (s->failed && (i == r6s->failed_num[0] || | |
2262 | i == r6s->failed_num[1]))) { | |
45b4233c | 2263 | pr_debug("Computing stripe %llu block %d\n", |
a4456856 DW |
2264 | (unsigned long long)sh->sector, i); |
2265 | compute_block_1(sh, i, 0); | |
2266 | s->uptodate++; | |
2267 | } else if ( s->uptodate == disks-2 && s->failed >= 2 ) { | |
2268 | /* Computing 2-failure is *very* expensive; only | |
2269 | * do it if failed >= 2 | |
2270 | */ | |
2271 | int other; | |
2272 | for (other = disks; other--; ) { | |
2273 | if (other == i) | |
2274 | continue; | |
2275 | if (!test_bit(R5_UPTODATE, | |
2276 | &sh->dev[other].flags)) | |
2277 | break; | |
2278 | } | |
2279 | BUG_ON(other < 0); | |
45b4233c | 2280 | pr_debug("Computing stripe %llu blocks %d,%d\n", |
a4456856 DW |
2281 | (unsigned long long)sh->sector, |
2282 | i, other); | |
2283 | compute_block_2(sh, i, other); | |
2284 | s->uptodate += 2; | |
2285 | } else if (test_bit(R5_Insync, &dev->flags)) { | |
2286 | set_bit(R5_LOCKED, &dev->flags); | |
2287 | set_bit(R5_Wantread, &dev->flags); | |
2288 | s->locked++; | |
45b4233c | 2289 | pr_debug("Reading block %d (sync=%d)\n", |
a4456856 DW |
2290 | i, s->syncing); |
2291 | } | |
2292 | } | |
2293 | } | |
2294 | set_bit(STRIPE_HANDLE, &sh->state); | |
2295 | } | |
2296 | ||
2297 | ||
1fe797e6 | 2298 | /* handle_stripe_clean_event |
a4456856 DW |
2299 | * any written block on an uptodate or failed drive can be returned. |
2300 | * Note that if we 'wrote' to a failed drive, it will be UPTODATE, but | |
2301 | * never LOCKED, so we don't need to test 'failed' directly. | |
2302 | */ | |
1fe797e6 | 2303 | static void handle_stripe_clean_event(raid5_conf_t *conf, |
a4456856 DW |
2304 | struct stripe_head *sh, int disks, struct bio **return_bi) |
2305 | { | |
2306 | int i; | |
2307 | struct r5dev *dev; | |
2308 | ||
2309 | for (i = disks; i--; ) | |
2310 | if (sh->dev[i].written) { | |
2311 | dev = &sh->dev[i]; | |
2312 | if (!test_bit(R5_LOCKED, &dev->flags) && | |
2313 | test_bit(R5_UPTODATE, &dev->flags)) { | |
2314 | /* We can return any write requests */ | |
2315 | struct bio *wbi, *wbi2; | |
2316 | int bitmap_end = 0; | |
45b4233c | 2317 | pr_debug("Return write for disc %d\n", i); |
a4456856 DW |
2318 | spin_lock_irq(&conf->device_lock); |
2319 | wbi = dev->written; | |
2320 | dev->written = NULL; | |
2321 | while (wbi && wbi->bi_sector < | |
2322 | dev->sector + STRIPE_SECTORS) { | |
2323 | wbi2 = r5_next_bio(wbi, dev->sector); | |
960e739d | 2324 | if (!raid5_dec_bi_phys_segments(wbi)) { |
a4456856 DW |
2325 | md_write_end(conf->mddev); |
2326 | wbi->bi_next = *return_bi; | |
2327 | *return_bi = wbi; | |
2328 | } | |
2329 | wbi = wbi2; | |
2330 | } | |
2331 | if (dev->towrite == NULL) | |
2332 | bitmap_end = 1; | |
2333 | spin_unlock_irq(&conf->device_lock); | |
2334 | if (bitmap_end) | |
2335 | bitmap_endwrite(conf->mddev->bitmap, | |
2336 | sh->sector, | |
2337 | STRIPE_SECTORS, | |
2338 | !test_bit(STRIPE_DEGRADED, &sh->state), | |
2339 | 0); | |
2340 | } | |
2341 | } | |
8b3e6cdc DW |
2342 | |
2343 | if (test_and_clear_bit(STRIPE_FULL_WRITE, &sh->state)) | |
2344 | if (atomic_dec_and_test(&conf->pending_full_writes)) | |
2345 | md_wakeup_thread(conf->mddev->thread); | |
a4456856 DW |
2346 | } |
2347 | ||
1fe797e6 | 2348 | static void handle_stripe_dirtying5(raid5_conf_t *conf, |
a4456856 DW |
2349 | struct stripe_head *sh, struct stripe_head_state *s, int disks) |
2350 | { | |
2351 | int rmw = 0, rcw = 0, i; | |
2352 | for (i = disks; i--; ) { | |
2353 | /* would I have to read this buffer for read_modify_write */ | |
2354 | struct r5dev *dev = &sh->dev[i]; | |
2355 | if ((dev->towrite || i == sh->pd_idx) && | |
2356 | !test_bit(R5_LOCKED, &dev->flags) && | |
f38e1219 DW |
2357 | !(test_bit(R5_UPTODATE, &dev->flags) || |
2358 | test_bit(R5_Wantcompute, &dev->flags))) { | |
a4456856 DW |
2359 | if (test_bit(R5_Insync, &dev->flags)) |
2360 | rmw++; | |
2361 | else | |
2362 | rmw += 2*disks; /* cannot read it */ | |
2363 | } | |
2364 | /* Would I have to read this buffer for reconstruct_write */ | |
2365 | if (!test_bit(R5_OVERWRITE, &dev->flags) && i != sh->pd_idx && | |
2366 | !test_bit(R5_LOCKED, &dev->flags) && | |
f38e1219 DW |
2367 | !(test_bit(R5_UPTODATE, &dev->flags) || |
2368 | test_bit(R5_Wantcompute, &dev->flags))) { | |
2369 | if (test_bit(R5_Insync, &dev->flags)) rcw++; | |
a4456856 DW |
2370 | else |
2371 | rcw += 2*disks; | |
2372 | } | |
2373 | } | |
45b4233c | 2374 | pr_debug("for sector %llu, rmw=%d rcw=%d\n", |
a4456856 DW |
2375 | (unsigned long long)sh->sector, rmw, rcw); |
2376 | set_bit(STRIPE_HANDLE, &sh->state); | |
2377 | if (rmw < rcw && rmw > 0) | |
2378 | /* prefer read-modify-write, but need to get some data */ | |
2379 | for (i = disks; i--; ) { | |
2380 | struct r5dev *dev = &sh->dev[i]; | |
2381 | if ((dev->towrite || i == sh->pd_idx) && | |
2382 | !test_bit(R5_LOCKED, &dev->flags) && | |
f38e1219 DW |
2383 | !(test_bit(R5_UPTODATE, &dev->flags) || |
2384 | test_bit(R5_Wantcompute, &dev->flags)) && | |
a4456856 DW |
2385 | test_bit(R5_Insync, &dev->flags)) { |
2386 | if ( | |
2387 | test_bit(STRIPE_PREREAD_ACTIVE, &sh->state)) { | |
45b4233c | 2388 | pr_debug("Read_old block " |
a4456856 DW |
2389 | "%d for r-m-w\n", i); |
2390 | set_bit(R5_LOCKED, &dev->flags); | |
2391 | set_bit(R5_Wantread, &dev->flags); | |
2392 | s->locked++; | |
2393 | } else { | |
2394 | set_bit(STRIPE_DELAYED, &sh->state); | |
2395 | set_bit(STRIPE_HANDLE, &sh->state); | |
2396 | } | |
2397 | } | |
2398 | } | |
2399 | if (rcw <= rmw && rcw > 0) | |
2400 | /* want reconstruct write, but need to get some data */ | |
2401 | for (i = disks; i--; ) { | |
2402 | struct r5dev *dev = &sh->dev[i]; | |
2403 | if (!test_bit(R5_OVERWRITE, &dev->flags) && | |
2404 | i != sh->pd_idx && | |
2405 | !test_bit(R5_LOCKED, &dev->flags) && | |
f38e1219 DW |
2406 | !(test_bit(R5_UPTODATE, &dev->flags) || |
2407 | test_bit(R5_Wantcompute, &dev->flags)) && | |
a4456856 DW |
2408 | test_bit(R5_Insync, &dev->flags)) { |
2409 | if ( | |
2410 | test_bit(STRIPE_PREREAD_ACTIVE, &sh->state)) { | |
45b4233c | 2411 | pr_debug("Read_old block " |
a4456856 DW |
2412 | "%d for Reconstruct\n", i); |
2413 | set_bit(R5_LOCKED, &dev->flags); | |
2414 | set_bit(R5_Wantread, &dev->flags); | |
2415 | s->locked++; | |
2416 | } else { | |
2417 | set_bit(STRIPE_DELAYED, &sh->state); | |
2418 | set_bit(STRIPE_HANDLE, &sh->state); | |
2419 | } | |
2420 | } | |
2421 | } | |
2422 | /* now if nothing is locked, and if we have enough data, | |
2423 | * we can start a write request | |
2424 | */ | |
f38e1219 DW |
2425 | /* since handle_stripe can be called at any time we need to handle the |
2426 | * case where a compute block operation has been submitted and then a | |
2427 | * subsequent call wants to start a write request. raid5_run_ops only | |
2428 | * handles the case where compute block and postxor are requested | |
2429 | * simultaneously. If this is not the case then new writes need to be | |
2430 | * held off until the compute completes. | |
2431 | */ | |
976ea8d4 DW |
2432 | if ((s->req_compute || !test_bit(STRIPE_COMPUTE_RUN, &sh->state)) && |
2433 | (s->locked == 0 && (rcw == 0 || rmw == 0) && | |
2434 | !test_bit(STRIPE_BIT_DELAY, &sh->state))) | |
1fe797e6 | 2435 | schedule_reconstruction5(sh, s, rcw == 0, 0); |
a4456856 DW |
2436 | } |
2437 | ||
1fe797e6 | 2438 | static void handle_stripe_dirtying6(raid5_conf_t *conf, |
a4456856 DW |
2439 | struct stripe_head *sh, struct stripe_head_state *s, |
2440 | struct r6_state *r6s, int disks) | |
2441 | { | |
2442 | int rcw = 0, must_compute = 0, pd_idx = sh->pd_idx, i; | |
34e04e87 | 2443 | int qd_idx = sh->qd_idx; |
a4456856 DW |
2444 | for (i = disks; i--; ) { |
2445 | struct r5dev *dev = &sh->dev[i]; | |
2446 | /* Would I have to read this buffer for reconstruct_write */ | |
2447 | if (!test_bit(R5_OVERWRITE, &dev->flags) | |
2448 | && i != pd_idx && i != qd_idx | |
2449 | && (!test_bit(R5_LOCKED, &dev->flags) | |
2450 | ) && | |
2451 | !test_bit(R5_UPTODATE, &dev->flags)) { | |
2452 | if (test_bit(R5_Insync, &dev->flags)) rcw++; | |
2453 | else { | |
45b4233c | 2454 | pr_debug("raid6: must_compute: " |
a4456856 DW |
2455 | "disk %d flags=%#lx\n", i, dev->flags); |
2456 | must_compute++; | |
2457 | } | |
2458 | } | |
2459 | } | |
45b4233c | 2460 | pr_debug("for sector %llu, rcw=%d, must_compute=%d\n", |
a4456856 DW |
2461 | (unsigned long long)sh->sector, rcw, must_compute); |
2462 | set_bit(STRIPE_HANDLE, &sh->state); | |
2463 | ||
2464 | if (rcw > 0) | |
2465 | /* want reconstruct write, but need to get some data */ | |
2466 | for (i = disks; i--; ) { | |
2467 | struct r5dev *dev = &sh->dev[i]; | |
2468 | if (!test_bit(R5_OVERWRITE, &dev->flags) | |
2469 | && !(s->failed == 0 && (i == pd_idx || i == qd_idx)) | |
2470 | && !test_bit(R5_LOCKED, &dev->flags) && | |
2471 | !test_bit(R5_UPTODATE, &dev->flags) && | |
2472 | test_bit(R5_Insync, &dev->flags)) { | |
2473 | if ( | |
2474 | test_bit(STRIPE_PREREAD_ACTIVE, &sh->state)) { | |
45b4233c | 2475 | pr_debug("Read_old stripe %llu " |
a4456856 DW |
2476 | "block %d for Reconstruct\n", |
2477 | (unsigned long long)sh->sector, i); | |
2478 | set_bit(R5_LOCKED, &dev->flags); | |
2479 | set_bit(R5_Wantread, &dev->flags); | |
2480 | s->locked++; | |
2481 | } else { | |
45b4233c | 2482 | pr_debug("Request delayed stripe %llu " |
a4456856 DW |
2483 | "block %d for Reconstruct\n", |
2484 | (unsigned long long)sh->sector, i); | |
2485 | set_bit(STRIPE_DELAYED, &sh->state); | |
2486 | set_bit(STRIPE_HANDLE, &sh->state); | |
2487 | } | |
2488 | } | |
2489 | } | |
2490 | /* now if nothing is locked, and if we have enough data, we can start a | |
2491 | * write request | |
2492 | */ | |
2493 | if (s->locked == 0 && rcw == 0 && | |
2494 | !test_bit(STRIPE_BIT_DELAY, &sh->state)) { | |
2495 | if (must_compute > 0) { | |
2496 | /* We have failed blocks and need to compute them */ | |
2497 | switch (s->failed) { | |
2498 | case 0: | |
2499 | BUG(); | |
2500 | case 1: | |
2501 | compute_block_1(sh, r6s->failed_num[0], 0); | |
2502 | break; | |
2503 | case 2: | |
2504 | compute_block_2(sh, r6s->failed_num[0], | |
2505 | r6s->failed_num[1]); | |
2506 | break; | |
2507 | default: /* This request should have been failed? */ | |
2508 | BUG(); | |
2509 | } | |
2510 | } | |
2511 | ||
45b4233c | 2512 | pr_debug("Computing parity for stripe %llu\n", |
a4456856 DW |
2513 | (unsigned long long)sh->sector); |
2514 | compute_parity6(sh, RECONSTRUCT_WRITE); | |
2515 | /* now every locked buffer is ready to be written */ | |
2516 | for (i = disks; i--; ) | |
2517 | if (test_bit(R5_LOCKED, &sh->dev[i].flags)) { | |
45b4233c | 2518 | pr_debug("Writing stripe %llu block %d\n", |
a4456856 DW |
2519 | (unsigned long long)sh->sector, i); |
2520 | s->locked++; | |
2521 | set_bit(R5_Wantwrite, &sh->dev[i].flags); | |
2522 | } | |
8b3e6cdc DW |
2523 | if (s->locked == disks) |
2524 | if (!test_and_set_bit(STRIPE_FULL_WRITE, &sh->state)) | |
2525 | atomic_inc(&conf->pending_full_writes); | |
a4456856 DW |
2526 | /* after a RECONSTRUCT_WRITE, the stripe MUST be in-sync */ |
2527 | set_bit(STRIPE_INSYNC, &sh->state); | |
2528 | ||
2529 | if (test_and_clear_bit(STRIPE_PREREAD_ACTIVE, &sh->state)) { | |
2530 | atomic_dec(&conf->preread_active_stripes); | |
2531 | if (atomic_read(&conf->preread_active_stripes) < | |
2532 | IO_THRESHOLD) | |
2533 | md_wakeup_thread(conf->mddev->thread); | |
2534 | } | |
2535 | } | |
2536 | } | |
2537 | ||
2538 | static void handle_parity_checks5(raid5_conf_t *conf, struct stripe_head *sh, | |
2539 | struct stripe_head_state *s, int disks) | |
2540 | { | |
ecc65c9b | 2541 | struct r5dev *dev = NULL; |
bd2ab670 | 2542 | |
a4456856 | 2543 | set_bit(STRIPE_HANDLE, &sh->state); |
e89f8962 | 2544 | |
ecc65c9b DW |
2545 | switch (sh->check_state) { |
2546 | case check_state_idle: | |
2547 | /* start a new check operation if there are no failures */ | |
bd2ab670 | 2548 | if (s->failed == 0) { |
bd2ab670 | 2549 | BUG_ON(s->uptodate != disks); |
ecc65c9b DW |
2550 | sh->check_state = check_state_run; |
2551 | set_bit(STRIPE_OP_CHECK, &s->ops_request); | |
bd2ab670 | 2552 | clear_bit(R5_UPTODATE, &sh->dev[sh->pd_idx].flags); |
bd2ab670 | 2553 | s->uptodate--; |
ecc65c9b | 2554 | break; |
bd2ab670 | 2555 | } |
ecc65c9b DW |
2556 | dev = &sh->dev[s->failed_num]; |
2557 | /* fall through */ | |
2558 | case check_state_compute_result: | |
2559 | sh->check_state = check_state_idle; | |
2560 | if (!dev) | |
2561 | dev = &sh->dev[sh->pd_idx]; | |
2562 | ||
2563 | /* check that a write has not made the stripe insync */ | |
2564 | if (test_bit(STRIPE_INSYNC, &sh->state)) | |
2565 | break; | |
c8894419 | 2566 | |
a4456856 | 2567 | /* either failed parity check, or recovery is happening */ |
a4456856 DW |
2568 | BUG_ON(!test_bit(R5_UPTODATE, &dev->flags)); |
2569 | BUG_ON(s->uptodate != disks); | |
2570 | ||
2571 | set_bit(R5_LOCKED, &dev->flags); | |
ecc65c9b | 2572 | s->locked++; |
a4456856 | 2573 | set_bit(R5_Wantwrite, &dev->flags); |
830ea016 | 2574 | |
a4456856 | 2575 | clear_bit(STRIPE_DEGRADED, &sh->state); |
a4456856 | 2576 | set_bit(STRIPE_INSYNC, &sh->state); |
ecc65c9b DW |
2577 | break; |
2578 | case check_state_run: | |
2579 | break; /* we will be called again upon completion */ | |
2580 | case check_state_check_result: | |
2581 | sh->check_state = check_state_idle; | |
2582 | ||
2583 | /* if a failure occurred during the check operation, leave | |
2584 | * STRIPE_INSYNC not set and let the stripe be handled again | |
2585 | */ | |
2586 | if (s->failed) | |
2587 | break; | |
2588 | ||
2589 | /* handle a successful check operation, if parity is correct | |
2590 | * we are done. Otherwise update the mismatch count and repair | |
2591 | * parity if !MD_RECOVERY_CHECK | |
2592 | */ | |
ad283ea4 | 2593 | if ((sh->ops.zero_sum_result & SUM_CHECK_P_RESULT) == 0) |
ecc65c9b DW |
2594 | /* parity is correct (on disc, |
2595 | * not in buffer any more) | |
2596 | */ | |
2597 | set_bit(STRIPE_INSYNC, &sh->state); | |
2598 | else { | |
2599 | conf->mddev->resync_mismatches += STRIPE_SECTORS; | |
2600 | if (test_bit(MD_RECOVERY_CHECK, &conf->mddev->recovery)) | |
2601 | /* don't try to repair!! */ | |
2602 | set_bit(STRIPE_INSYNC, &sh->state); | |
2603 | else { | |
2604 | sh->check_state = check_state_compute_run; | |
976ea8d4 | 2605 | set_bit(STRIPE_COMPUTE_RUN, &sh->state); |
ecc65c9b DW |
2606 | set_bit(STRIPE_OP_COMPUTE_BLK, &s->ops_request); |
2607 | set_bit(R5_Wantcompute, | |
2608 | &sh->dev[sh->pd_idx].flags); | |
2609 | sh->ops.target = sh->pd_idx; | |
2610 | s->uptodate++; | |
2611 | } | |
2612 | } | |
2613 | break; | |
2614 | case check_state_compute_run: | |
2615 | break; | |
2616 | default: | |
2617 | printk(KERN_ERR "%s: unknown check_state: %d sector: %llu\n", | |
2618 | __func__, sh->check_state, | |
2619 | (unsigned long long) sh->sector); | |
2620 | BUG(); | |
a4456856 DW |
2621 | } |
2622 | } | |
2623 | ||
2624 | ||
2625 | static void handle_parity_checks6(raid5_conf_t *conf, struct stripe_head *sh, | |
36d1c647 DW |
2626 | struct stripe_head_state *s, |
2627 | struct r6_state *r6s, int disks) | |
a4456856 DW |
2628 | { |
2629 | int update_p = 0, update_q = 0; | |
2630 | struct r5dev *dev; | |
2631 | int pd_idx = sh->pd_idx; | |
34e04e87 | 2632 | int qd_idx = sh->qd_idx; |
36d1c647 DW |
2633 | unsigned long cpu; |
2634 | struct page *tmp_page; | |
a4456856 DW |
2635 | |
2636 | set_bit(STRIPE_HANDLE, &sh->state); | |
2637 | ||
2638 | BUG_ON(s->failed > 2); | |
2639 | BUG_ON(s->uptodate < disks); | |
2640 | /* Want to check and possibly repair P and Q. | |
2641 | * However there could be one 'failed' device, in which | |
2642 | * case we can only check one of them, possibly using the | |
2643 | * other to generate missing data | |
2644 | */ | |
36d1c647 DW |
2645 | cpu = get_cpu(); |
2646 | tmp_page = per_cpu_ptr(conf->percpu, cpu)->spare_page; | |
2647 | if (s->failed == r6s->q_failed) { | |
2648 | /* The only possible failed device holds 'Q', so it | |
2649 | * makes sense to check P (If anything else were failed, | |
2650 | * we would have used P to recreate it). | |
2651 | */ | |
2652 | compute_block_1(sh, pd_idx, 1); | |
2653 | if (!page_is_zero(sh->dev[pd_idx].page)) { | |
2654 | compute_block_1(sh, pd_idx, 0); | |
2655 | update_p = 1; | |
a4456856 | 2656 | } |
36d1c647 DW |
2657 | } |
2658 | if (!r6s->q_failed && s->failed < 2) { | |
2659 | /* q is not failed, and we didn't use it to generate | |
2660 | * anything, so it makes sense to check it | |
2661 | */ | |
2662 | memcpy(page_address(tmp_page), | |
2663 | page_address(sh->dev[qd_idx].page), | |
2664 | STRIPE_SIZE); | |
2665 | compute_parity6(sh, UPDATE_PARITY); | |
2666 | if (memcmp(page_address(tmp_page), | |
2667 | page_address(sh->dev[qd_idx].page), | |
2668 | STRIPE_SIZE) != 0) { | |
2669 | clear_bit(STRIPE_INSYNC, &sh->state); | |
2670 | update_q = 1; | |
a4456856 | 2671 | } |
36d1c647 DW |
2672 | } |
2673 | put_cpu(); | |
a4456856 | 2674 | |
36d1c647 DW |
2675 | if (update_p || update_q) { |
2676 | conf->mddev->resync_mismatches += STRIPE_SECTORS; | |
2677 | if (test_bit(MD_RECOVERY_CHECK, &conf->mddev->recovery)) | |
2678 | /* don't try to repair!! */ | |
2679 | update_p = update_q = 0; | |
2680 | } | |
a4456856 | 2681 | |
36d1c647 DW |
2682 | /* now write out any block on a failed drive, |
2683 | * or P or Q if they need it | |
2684 | */ | |
a4456856 | 2685 | |
36d1c647 DW |
2686 | if (s->failed == 2) { |
2687 | dev = &sh->dev[r6s->failed_num[1]]; | |
2688 | s->locked++; | |
2689 | set_bit(R5_LOCKED, &dev->flags); | |
2690 | set_bit(R5_Wantwrite, &dev->flags); | |
2691 | } | |
2692 | if (s->failed >= 1) { | |
2693 | dev = &sh->dev[r6s->failed_num[0]]; | |
2694 | s->locked++; | |
2695 | set_bit(R5_LOCKED, &dev->flags); | |
2696 | set_bit(R5_Wantwrite, &dev->flags); | |
2697 | } | |
a4456856 | 2698 | |
36d1c647 DW |
2699 | if (update_p) { |
2700 | dev = &sh->dev[pd_idx]; | |
2701 | s->locked++; | |
2702 | set_bit(R5_LOCKED, &dev->flags); | |
2703 | set_bit(R5_Wantwrite, &dev->flags); | |
2704 | } | |
2705 | if (update_q) { | |
2706 | dev = &sh->dev[qd_idx]; | |
2707 | s->locked++; | |
2708 | set_bit(R5_LOCKED, &dev->flags); | |
2709 | set_bit(R5_Wantwrite, &dev->flags); | |
a4456856 | 2710 | } |
36d1c647 DW |
2711 | clear_bit(STRIPE_DEGRADED, &sh->state); |
2712 | ||
2713 | set_bit(STRIPE_INSYNC, &sh->state); | |
a4456856 DW |
2714 | } |
2715 | ||
2716 | static void handle_stripe_expansion(raid5_conf_t *conf, struct stripe_head *sh, | |
2717 | struct r6_state *r6s) | |
2718 | { | |
2719 | int i; | |
2720 | ||
2721 | /* We have read all the blocks in this stripe and now we need to | |
2722 | * copy some of them into a target stripe for expand. | |
2723 | */ | |
f0a50d37 | 2724 | struct dma_async_tx_descriptor *tx = NULL; |
a4456856 DW |
2725 | clear_bit(STRIPE_EXPAND_SOURCE, &sh->state); |
2726 | for (i = 0; i < sh->disks; i++) | |
34e04e87 | 2727 | if (i != sh->pd_idx && i != sh->qd_idx) { |
911d4ee8 | 2728 | int dd_idx, j; |
a4456856 | 2729 | struct stripe_head *sh2; |
a08abd8c | 2730 | struct async_submit_ctl submit; |
a4456856 | 2731 | |
784052ec | 2732 | sector_t bn = compute_blocknr(sh, i, 1); |
911d4ee8 N |
2733 | sector_t s = raid5_compute_sector(conf, bn, 0, |
2734 | &dd_idx, NULL); | |
b5663ba4 | 2735 | sh2 = get_active_stripe(conf, s, 0, 1); |
a4456856 DW |
2736 | if (sh2 == NULL) |
2737 | /* so far only the early blocks of this stripe | |
2738 | * have been requested. When later blocks | |
2739 | * get requested, we will try again | |
2740 | */ | |
2741 | continue; | |
2742 | if (!test_bit(STRIPE_EXPANDING, &sh2->state) || | |
2743 | test_bit(R5_Expanded, &sh2->dev[dd_idx].flags)) { | |
2744 | /* must have already done this block */ | |
2745 | release_stripe(sh2); | |
2746 | continue; | |
2747 | } | |
f0a50d37 DW |
2748 | |
2749 | /* place all the copies on one channel */ | |
a08abd8c | 2750 | init_async_submit(&submit, 0, tx, NULL, NULL, NULL); |
f0a50d37 | 2751 | tx = async_memcpy(sh2->dev[dd_idx].page, |
88ba2aa5 | 2752 | sh->dev[i].page, 0, 0, STRIPE_SIZE, |
a08abd8c | 2753 | &submit); |
f0a50d37 | 2754 | |
a4456856 DW |
2755 | set_bit(R5_Expanded, &sh2->dev[dd_idx].flags); |
2756 | set_bit(R5_UPTODATE, &sh2->dev[dd_idx].flags); | |
2757 | for (j = 0; j < conf->raid_disks; j++) | |
2758 | if (j != sh2->pd_idx && | |
d0dabf7e | 2759 | (!r6s || j != sh2->qd_idx) && |
a4456856 DW |
2760 | !test_bit(R5_Expanded, &sh2->dev[j].flags)) |
2761 | break; | |
2762 | if (j == conf->raid_disks) { | |
2763 | set_bit(STRIPE_EXPAND_READY, &sh2->state); | |
2764 | set_bit(STRIPE_HANDLE, &sh2->state); | |
2765 | } | |
2766 | release_stripe(sh2); | |
f0a50d37 | 2767 | |
a4456856 | 2768 | } |
a2e08551 N |
2769 | /* done submitting copies, wait for them to complete */ |
2770 | if (tx) { | |
2771 | async_tx_ack(tx); | |
2772 | dma_wait_for_async_tx(tx); | |
2773 | } | |
a4456856 | 2774 | } |
1da177e4 | 2775 | |
6bfe0b49 | 2776 | |
1da177e4 LT |
2777 | /* |
2778 | * handle_stripe - do things to a stripe. | |
2779 | * | |
2780 | * We lock the stripe and then examine the state of various bits | |
2781 | * to see what needs to be done. | |
2782 | * Possible results: | |
2783 | * return some read request which now have data | |
2784 | * return some write requests which are safely on disc | |
2785 | * schedule a read on some buffers | |
2786 | * schedule a write of some buffers | |
2787 | * return confirmation of parity correctness | |
2788 | * | |
1da177e4 LT |
2789 | * buffers are taken off read_list or write_list, and bh_cache buffers |
2790 | * get BH_Lock set before the stripe lock is released. | |
2791 | * | |
2792 | */ | |
a4456856 | 2793 | |
df10cfbc | 2794 | static bool handle_stripe5(struct stripe_head *sh) |
1da177e4 LT |
2795 | { |
2796 | raid5_conf_t *conf = sh->raid_conf; | |
a4456856 DW |
2797 | int disks = sh->disks, i; |
2798 | struct bio *return_bi = NULL; | |
2799 | struct stripe_head_state s; | |
1da177e4 | 2800 | struct r5dev *dev; |
6bfe0b49 | 2801 | mdk_rdev_t *blocked_rdev = NULL; |
e0a115e5 | 2802 | int prexor; |
1da177e4 | 2803 | |
a4456856 | 2804 | memset(&s, 0, sizeof(s)); |
600aa109 DW |
2805 | pr_debug("handling stripe %llu, state=%#lx cnt=%d, pd_idx=%d check:%d " |
2806 | "reconstruct:%d\n", (unsigned long long)sh->sector, sh->state, | |
2807 | atomic_read(&sh->count), sh->pd_idx, sh->check_state, | |
2808 | sh->reconstruct_state); | |
1da177e4 LT |
2809 | |
2810 | spin_lock(&sh->lock); | |
2811 | clear_bit(STRIPE_HANDLE, &sh->state); | |
2812 | clear_bit(STRIPE_DELAYED, &sh->state); | |
2813 | ||
a4456856 DW |
2814 | s.syncing = test_bit(STRIPE_SYNCING, &sh->state); |
2815 | s.expanding = test_bit(STRIPE_EXPAND_SOURCE, &sh->state); | |
2816 | s.expanded = test_bit(STRIPE_EXPAND_READY, &sh->state); | |
def6ae26 | 2817 | |
83de75cc | 2818 | /* Now to look around and see what can be done */ |
9910f16a | 2819 | rcu_read_lock(); |
1da177e4 LT |
2820 | for (i=disks; i--; ) { |
2821 | mdk_rdev_t *rdev; | |
a4456856 | 2822 | struct r5dev *dev = &sh->dev[i]; |
1da177e4 | 2823 | clear_bit(R5_Insync, &dev->flags); |
1da177e4 | 2824 | |
b5e98d65 DW |
2825 | pr_debug("check %d: state 0x%lx toread %p read %p write %p " |
2826 | "written %p\n", i, dev->flags, dev->toread, dev->read, | |
2827 | dev->towrite, dev->written); | |
2828 | ||
2829 | /* maybe we can request a biofill operation | |
2830 | * | |
2831 | * new wantfill requests are only permitted while | |
83de75cc | 2832 | * ops_complete_biofill is guaranteed to be inactive |
b5e98d65 DW |
2833 | */ |
2834 | if (test_bit(R5_UPTODATE, &dev->flags) && dev->toread && | |
83de75cc | 2835 | !test_bit(STRIPE_BIOFILL_RUN, &sh->state)) |
b5e98d65 | 2836 | set_bit(R5_Wantfill, &dev->flags); |
1da177e4 LT |
2837 | |
2838 | /* now count some things */ | |
a4456856 DW |
2839 | if (test_bit(R5_LOCKED, &dev->flags)) s.locked++; |
2840 | if (test_bit(R5_UPTODATE, &dev->flags)) s.uptodate++; | |
f38e1219 | 2841 | if (test_bit(R5_Wantcompute, &dev->flags)) s.compute++; |
1da177e4 | 2842 | |
b5e98d65 DW |
2843 | if (test_bit(R5_Wantfill, &dev->flags)) |
2844 | s.to_fill++; | |
2845 | else if (dev->toread) | |
a4456856 | 2846 | s.to_read++; |
1da177e4 | 2847 | if (dev->towrite) { |
a4456856 | 2848 | s.to_write++; |
1da177e4 | 2849 | if (!test_bit(R5_OVERWRITE, &dev->flags)) |
a4456856 | 2850 | s.non_overwrite++; |
1da177e4 | 2851 | } |
a4456856 DW |
2852 | if (dev->written) |
2853 | s.written++; | |
9910f16a | 2854 | rdev = rcu_dereference(conf->disks[i].rdev); |
ac4090d2 N |
2855 | if (blocked_rdev == NULL && |
2856 | rdev && unlikely(test_bit(Blocked, &rdev->flags))) { | |
6bfe0b49 DW |
2857 | blocked_rdev = rdev; |
2858 | atomic_inc(&rdev->nr_pending); | |
6bfe0b49 | 2859 | } |
b2d444d7 | 2860 | if (!rdev || !test_bit(In_sync, &rdev->flags)) { |
14f8d26b | 2861 | /* The ReadError flag will just be confusing now */ |
4e5314b5 N |
2862 | clear_bit(R5_ReadError, &dev->flags); |
2863 | clear_bit(R5_ReWrite, &dev->flags); | |
2864 | } | |
b2d444d7 | 2865 | if (!rdev || !test_bit(In_sync, &rdev->flags) |
4e5314b5 | 2866 | || test_bit(R5_ReadError, &dev->flags)) { |
a4456856 DW |
2867 | s.failed++; |
2868 | s.failed_num = i; | |
1da177e4 LT |
2869 | } else |
2870 | set_bit(R5_Insync, &dev->flags); | |
2871 | } | |
9910f16a | 2872 | rcu_read_unlock(); |
b5e98d65 | 2873 | |
6bfe0b49 | 2874 | if (unlikely(blocked_rdev)) { |
ac4090d2 N |
2875 | if (s.syncing || s.expanding || s.expanded || |
2876 | s.to_write || s.written) { | |
2877 | set_bit(STRIPE_HANDLE, &sh->state); | |
2878 | goto unlock; | |
2879 | } | |
2880 | /* There is nothing for the blocked_rdev to block */ | |
2881 | rdev_dec_pending(blocked_rdev, conf->mddev); | |
2882 | blocked_rdev = NULL; | |
6bfe0b49 DW |
2883 | } |
2884 | ||
83de75cc DW |
2885 | if (s.to_fill && !test_bit(STRIPE_BIOFILL_RUN, &sh->state)) { |
2886 | set_bit(STRIPE_OP_BIOFILL, &s.ops_request); | |
2887 | set_bit(STRIPE_BIOFILL_RUN, &sh->state); | |
2888 | } | |
b5e98d65 | 2889 | |
45b4233c | 2890 | pr_debug("locked=%d uptodate=%d to_read=%d" |
1da177e4 | 2891 | " to_write=%d failed=%d failed_num=%d\n", |
a4456856 DW |
2892 | s.locked, s.uptodate, s.to_read, s.to_write, |
2893 | s.failed, s.failed_num); | |
1da177e4 LT |
2894 | /* check if the array has lost two devices and, if so, some requests might |
2895 | * need to be failed | |
2896 | */ | |
a4456856 | 2897 | if (s.failed > 1 && s.to_read+s.to_write+s.written) |
1fe797e6 | 2898 | handle_failed_stripe(conf, sh, &s, disks, &return_bi); |
a4456856 | 2899 | if (s.failed > 1 && s.syncing) { |
1da177e4 LT |
2900 | md_done_sync(conf->mddev, STRIPE_SECTORS,0); |
2901 | clear_bit(STRIPE_SYNCING, &sh->state); | |
a4456856 | 2902 | s.syncing = 0; |
1da177e4 LT |
2903 | } |
2904 | ||
2905 | /* might be able to return some write requests if the parity block | |
2906 | * is safe, or on a failed drive | |
2907 | */ | |
2908 | dev = &sh->dev[sh->pd_idx]; | |
a4456856 DW |
2909 | if ( s.written && |
2910 | ((test_bit(R5_Insync, &dev->flags) && | |
2911 | !test_bit(R5_LOCKED, &dev->flags) && | |
2912 | test_bit(R5_UPTODATE, &dev->flags)) || | |
2913 | (s.failed == 1 && s.failed_num == sh->pd_idx))) | |
1fe797e6 | 2914 | handle_stripe_clean_event(conf, sh, disks, &return_bi); |
1da177e4 LT |
2915 | |
2916 | /* Now we might consider reading some blocks, either to check/generate | |
2917 | * parity, or to satisfy requests | |
2918 | * or to load a block that is being partially written. | |
2919 | */ | |
a4456856 | 2920 | if (s.to_read || s.non_overwrite || |
976ea8d4 | 2921 | (s.syncing && (s.uptodate + s.compute < disks)) || s.expanding) |
1fe797e6 | 2922 | handle_stripe_fill5(sh, &s, disks); |
1da177e4 | 2923 | |
e33129d8 DW |
2924 | /* Now we check to see if any write operations have recently |
2925 | * completed | |
2926 | */ | |
e0a115e5 | 2927 | prexor = 0; |
d8ee0728 | 2928 | if (sh->reconstruct_state == reconstruct_state_prexor_drain_result) |
e0a115e5 | 2929 | prexor = 1; |
d8ee0728 DW |
2930 | if (sh->reconstruct_state == reconstruct_state_drain_result || |
2931 | sh->reconstruct_state == reconstruct_state_prexor_drain_result) { | |
600aa109 | 2932 | sh->reconstruct_state = reconstruct_state_idle; |
e33129d8 DW |
2933 | |
2934 | /* All the 'written' buffers and the parity block are ready to | |
2935 | * be written back to disk | |
2936 | */ | |
2937 | BUG_ON(!test_bit(R5_UPTODATE, &sh->dev[sh->pd_idx].flags)); | |
2938 | for (i = disks; i--; ) { | |
2939 | dev = &sh->dev[i]; | |
2940 | if (test_bit(R5_LOCKED, &dev->flags) && | |
2941 | (i == sh->pd_idx || dev->written)) { | |
2942 | pr_debug("Writing block %d\n", i); | |
2943 | set_bit(R5_Wantwrite, &dev->flags); | |
e0a115e5 DW |
2944 | if (prexor) |
2945 | continue; | |
e33129d8 DW |
2946 | if (!test_bit(R5_Insync, &dev->flags) || |
2947 | (i == sh->pd_idx && s.failed == 0)) | |
2948 | set_bit(STRIPE_INSYNC, &sh->state); | |
2949 | } | |
2950 | } | |
2951 | if (test_and_clear_bit(STRIPE_PREREAD_ACTIVE, &sh->state)) { | |
2952 | atomic_dec(&conf->preread_active_stripes); | |
2953 | if (atomic_read(&conf->preread_active_stripes) < | |
2954 | IO_THRESHOLD) | |
2955 | md_wakeup_thread(conf->mddev->thread); | |
2956 | } | |
2957 | } | |
2958 | ||
2959 | /* Now to consider new write requests and what else, if anything | |
2960 | * should be read. We do not handle new writes when: | |
2961 | * 1/ A 'write' operation (copy+xor) is already in flight. | |
2962 | * 2/ A 'check' operation is in flight, as it may clobber the parity | |
2963 | * block. | |
2964 | */ | |
600aa109 | 2965 | if (s.to_write && !sh->reconstruct_state && !sh->check_state) |
1fe797e6 | 2966 | handle_stripe_dirtying5(conf, sh, &s, disks); |
1da177e4 LT |
2967 | |
2968 | /* maybe we need to check and possibly fix the parity for this stripe | |
e89f8962 DW |
2969 | * Any reads will already have been scheduled, so we just see if enough |
2970 | * data is available. The parity check is held off while parity | |
2971 | * dependent operations are in flight. | |
1da177e4 | 2972 | */ |
ecc65c9b DW |
2973 | if (sh->check_state || |
2974 | (s.syncing && s.locked == 0 && | |
976ea8d4 | 2975 | !test_bit(STRIPE_COMPUTE_RUN, &sh->state) && |
ecc65c9b | 2976 | !test_bit(STRIPE_INSYNC, &sh->state))) |
a4456856 | 2977 | handle_parity_checks5(conf, sh, &s, disks); |
e89f8962 | 2978 | |
a4456856 | 2979 | if (s.syncing && s.locked == 0 && test_bit(STRIPE_INSYNC, &sh->state)) { |
1da177e4 LT |
2980 | md_done_sync(conf->mddev, STRIPE_SECTORS,1); |
2981 | clear_bit(STRIPE_SYNCING, &sh->state); | |
2982 | } | |
4e5314b5 N |
2983 | |
2984 | /* If the failed drive is just a ReadError, then we might need to progress | |
2985 | * the repair/check process | |
2986 | */ | |
a4456856 DW |
2987 | if (s.failed == 1 && !conf->mddev->ro && |
2988 | test_bit(R5_ReadError, &sh->dev[s.failed_num].flags) | |
2989 | && !test_bit(R5_LOCKED, &sh->dev[s.failed_num].flags) | |
2990 | && test_bit(R5_UPTODATE, &sh->dev[s.failed_num].flags) | |
4e5314b5 | 2991 | ) { |
a4456856 | 2992 | dev = &sh->dev[s.failed_num]; |
4e5314b5 N |
2993 | if (!test_bit(R5_ReWrite, &dev->flags)) { |
2994 | set_bit(R5_Wantwrite, &dev->flags); | |
2995 | set_bit(R5_ReWrite, &dev->flags); | |
2996 | set_bit(R5_LOCKED, &dev->flags); | |
a4456856 | 2997 | s.locked++; |
4e5314b5 N |
2998 | } else { |
2999 | /* let's read it back */ | |
3000 | set_bit(R5_Wantread, &dev->flags); | |
3001 | set_bit(R5_LOCKED, &dev->flags); | |
a4456856 | 3002 | s.locked++; |
4e5314b5 N |
3003 | } |
3004 | } | |
3005 | ||
600aa109 DW |
3006 | /* Finish reconstruct operations initiated by the expansion process */ |
3007 | if (sh->reconstruct_state == reconstruct_state_result) { | |
ab69ae12 N |
3008 | struct stripe_head *sh2 |
3009 | = get_active_stripe(conf, sh->sector, 1, 1); | |
3010 | if (sh2 && test_bit(STRIPE_EXPAND_SOURCE, &sh2->state)) { | |
3011 | /* sh cannot be written until sh2 has been read. | |
3012 | * so arrange for sh to be delayed a little | |
3013 | */ | |
3014 | set_bit(STRIPE_DELAYED, &sh->state); | |
3015 | set_bit(STRIPE_HANDLE, &sh->state); | |
3016 | if (!test_and_set_bit(STRIPE_PREREAD_ACTIVE, | |
3017 | &sh2->state)) | |
3018 | atomic_inc(&conf->preread_active_stripes); | |
3019 | release_stripe(sh2); | |
3020 | goto unlock; | |
3021 | } | |
3022 | if (sh2) | |
3023 | release_stripe(sh2); | |
3024 | ||
600aa109 | 3025 | sh->reconstruct_state = reconstruct_state_idle; |
f0a50d37 | 3026 | clear_bit(STRIPE_EXPANDING, &sh->state); |
23397883 | 3027 | for (i = conf->raid_disks; i--; ) { |
ccfcc3c1 | 3028 | set_bit(R5_Wantwrite, &sh->dev[i].flags); |
23397883 | 3029 | set_bit(R5_LOCKED, &sh->dev[i].flags); |
efe31143 | 3030 | s.locked++; |
23397883 | 3031 | } |
f0a50d37 DW |
3032 | } |
3033 | ||
3034 | if (s.expanded && test_bit(STRIPE_EXPANDING, &sh->state) && | |
600aa109 | 3035 | !sh->reconstruct_state) { |
f0a50d37 DW |
3036 | /* Need to write out all blocks after computing parity */ |
3037 | sh->disks = conf->raid_disks; | |
911d4ee8 | 3038 | stripe_set_idx(sh->sector, conf, 0, sh); |
1fe797e6 | 3039 | schedule_reconstruction5(sh, &s, 1, 1); |
600aa109 | 3040 | } else if (s.expanded && !sh->reconstruct_state && s.locked == 0) { |
ccfcc3c1 | 3041 | clear_bit(STRIPE_EXPAND_READY, &sh->state); |
f6705578 | 3042 | atomic_dec(&conf->reshape_stripes); |
ccfcc3c1 N |
3043 | wake_up(&conf->wait_for_overlap); |
3044 | md_done_sync(conf->mddev, STRIPE_SECTORS, 1); | |
3045 | } | |
3046 | ||
0f94e87c | 3047 | if (s.expanding && s.locked == 0 && |
976ea8d4 | 3048 | !test_bit(STRIPE_COMPUTE_RUN, &sh->state)) |
a4456856 | 3049 | handle_stripe_expansion(conf, sh, NULL); |
ccfcc3c1 | 3050 | |
6bfe0b49 | 3051 | unlock: |
1da177e4 LT |
3052 | spin_unlock(&sh->lock); |
3053 | ||
6bfe0b49 DW |
3054 | /* wait for this device to become unblocked */ |
3055 | if (unlikely(blocked_rdev)) | |
3056 | md_wait_for_blocked_rdev(blocked_rdev, conf->mddev); | |
3057 | ||
600aa109 DW |
3058 | if (s.ops_request) |
3059 | raid5_run_ops(sh, s.ops_request); | |
d84e0f10 | 3060 | |
c4e5ac0a | 3061 | ops_run_io(sh, &s); |
1da177e4 | 3062 | |
a4456856 | 3063 | return_io(return_bi); |
df10cfbc DW |
3064 | |
3065 | return blocked_rdev == NULL; | |
1da177e4 LT |
3066 | } |
3067 | ||
36d1c647 | 3068 | static bool handle_stripe6(struct stripe_head *sh) |
1da177e4 | 3069 | { |
bff61975 | 3070 | raid5_conf_t *conf = sh->raid_conf; |
f416885e | 3071 | int disks = sh->disks; |
a4456856 | 3072 | struct bio *return_bi = NULL; |
34e04e87 | 3073 | int i, pd_idx = sh->pd_idx, qd_idx = sh->qd_idx; |
a4456856 DW |
3074 | struct stripe_head_state s; |
3075 | struct r6_state r6s; | |
16a53ecc | 3076 | struct r5dev *dev, *pdev, *qdev; |
6bfe0b49 | 3077 | mdk_rdev_t *blocked_rdev = NULL; |
1da177e4 | 3078 | |
45b4233c | 3079 | pr_debug("handling stripe %llu, state=%#lx cnt=%d, " |
a4456856 DW |
3080 | "pd_idx=%d, qd_idx=%d\n", |
3081 | (unsigned long long)sh->sector, sh->state, | |
34e04e87 | 3082 | atomic_read(&sh->count), pd_idx, qd_idx); |
a4456856 | 3083 | memset(&s, 0, sizeof(s)); |
72626685 | 3084 | |
16a53ecc N |
3085 | spin_lock(&sh->lock); |
3086 | clear_bit(STRIPE_HANDLE, &sh->state); | |
3087 | clear_bit(STRIPE_DELAYED, &sh->state); | |
3088 | ||
a4456856 DW |
3089 | s.syncing = test_bit(STRIPE_SYNCING, &sh->state); |
3090 | s.expanding = test_bit(STRIPE_EXPAND_SOURCE, &sh->state); | |
3091 | s.expanded = test_bit(STRIPE_EXPAND_READY, &sh->state); | |
16a53ecc | 3092 | /* Now to look around and see what can be done */ |
1da177e4 LT |
3093 | |
3094 | rcu_read_lock(); | |
16a53ecc N |
3095 | for (i=disks; i--; ) { |
3096 | mdk_rdev_t *rdev; | |
3097 | dev = &sh->dev[i]; | |
3098 | clear_bit(R5_Insync, &dev->flags); | |
1da177e4 | 3099 | |
45b4233c | 3100 | pr_debug("check %d: state 0x%lx read %p write %p written %p\n", |
16a53ecc N |
3101 | i, dev->flags, dev->toread, dev->towrite, dev->written); |
3102 | /* maybe we can reply to a read */ | |
3103 | if (test_bit(R5_UPTODATE, &dev->flags) && dev->toread) { | |
3104 | struct bio *rbi, *rbi2; | |
45b4233c | 3105 | pr_debug("Return read for disc %d\n", i); |
16a53ecc N |
3106 | spin_lock_irq(&conf->device_lock); |
3107 | rbi = dev->toread; | |
3108 | dev->toread = NULL; | |
3109 | if (test_and_clear_bit(R5_Overlap, &dev->flags)) | |
3110 | wake_up(&conf->wait_for_overlap); | |
3111 | spin_unlock_irq(&conf->device_lock); | |
3112 | while (rbi && rbi->bi_sector < dev->sector + STRIPE_SECTORS) { | |
3113 | copy_data(0, rbi, dev->page, dev->sector); | |
3114 | rbi2 = r5_next_bio(rbi, dev->sector); | |
3115 | spin_lock_irq(&conf->device_lock); | |
960e739d | 3116 | if (!raid5_dec_bi_phys_segments(rbi)) { |
16a53ecc N |
3117 | rbi->bi_next = return_bi; |
3118 | return_bi = rbi; | |
3119 | } | |
3120 | spin_unlock_irq(&conf->device_lock); | |
3121 | rbi = rbi2; | |
3122 | } | |
3123 | } | |
1da177e4 | 3124 | |
16a53ecc | 3125 | /* now count some things */ |
a4456856 DW |
3126 | if (test_bit(R5_LOCKED, &dev->flags)) s.locked++; |
3127 | if (test_bit(R5_UPTODATE, &dev->flags)) s.uptodate++; | |
1da177e4 | 3128 | |
16a53ecc | 3129 | |
a4456856 DW |
3130 | if (dev->toread) |
3131 | s.to_read++; | |
16a53ecc | 3132 | if (dev->towrite) { |
a4456856 | 3133 | s.to_write++; |
16a53ecc | 3134 | if (!test_bit(R5_OVERWRITE, &dev->flags)) |
a4456856 | 3135 | s.non_overwrite++; |
16a53ecc | 3136 | } |
a4456856 DW |
3137 | if (dev->written) |
3138 | s.written++; | |
16a53ecc | 3139 | rdev = rcu_dereference(conf->disks[i].rdev); |
ac4090d2 N |
3140 | if (blocked_rdev == NULL && |
3141 | rdev && unlikely(test_bit(Blocked, &rdev->flags))) { | |
6bfe0b49 DW |
3142 | blocked_rdev = rdev; |
3143 | atomic_inc(&rdev->nr_pending); | |
6bfe0b49 | 3144 | } |
16a53ecc N |
3145 | if (!rdev || !test_bit(In_sync, &rdev->flags)) { |
3146 | /* The ReadError flag will just be confusing now */ | |
3147 | clear_bit(R5_ReadError, &dev->flags); | |
3148 | clear_bit(R5_ReWrite, &dev->flags); | |
1da177e4 | 3149 | } |
16a53ecc N |
3150 | if (!rdev || !test_bit(In_sync, &rdev->flags) |
3151 | || test_bit(R5_ReadError, &dev->flags)) { | |
a4456856 DW |
3152 | if (s.failed < 2) |
3153 | r6s.failed_num[s.failed] = i; | |
3154 | s.failed++; | |
16a53ecc N |
3155 | } else |
3156 | set_bit(R5_Insync, &dev->flags); | |
1da177e4 LT |
3157 | } |
3158 | rcu_read_unlock(); | |
6bfe0b49 DW |
3159 | |
3160 | if (unlikely(blocked_rdev)) { | |
ac4090d2 N |
3161 | if (s.syncing || s.expanding || s.expanded || |
3162 | s.to_write || s.written) { | |
3163 | set_bit(STRIPE_HANDLE, &sh->state); | |
3164 | goto unlock; | |
3165 | } | |
3166 | /* There is nothing for the blocked_rdev to block */ | |
3167 | rdev_dec_pending(blocked_rdev, conf->mddev); | |
3168 | blocked_rdev = NULL; | |
6bfe0b49 | 3169 | } |
ac4090d2 | 3170 | |
45b4233c | 3171 | pr_debug("locked=%d uptodate=%d to_read=%d" |
16a53ecc | 3172 | " to_write=%d failed=%d failed_num=%d,%d\n", |
a4456856 DW |
3173 | s.locked, s.uptodate, s.to_read, s.to_write, s.failed, |
3174 | r6s.failed_num[0], r6s.failed_num[1]); | |
3175 | /* check if the array has lost >2 devices and, if so, some requests | |
3176 | * might need to be failed | |
16a53ecc | 3177 | */ |
a4456856 | 3178 | if (s.failed > 2 && s.to_read+s.to_write+s.written) |
1fe797e6 | 3179 | handle_failed_stripe(conf, sh, &s, disks, &return_bi); |
a4456856 | 3180 | if (s.failed > 2 && s.syncing) { |
16a53ecc N |
3181 | md_done_sync(conf->mddev, STRIPE_SECTORS,0); |
3182 | clear_bit(STRIPE_SYNCING, &sh->state); | |
a4456856 | 3183 | s.syncing = 0; |
16a53ecc N |
3184 | } |
3185 | ||
3186 | /* | |
3187 | * might be able to return some write requests if the parity blocks | |
3188 | * are safe, or on a failed drive | |
3189 | */ | |
3190 | pdev = &sh->dev[pd_idx]; | |
a4456856 DW |
3191 | r6s.p_failed = (s.failed >= 1 && r6s.failed_num[0] == pd_idx) |
3192 | || (s.failed >= 2 && r6s.failed_num[1] == pd_idx); | |
34e04e87 N |
3193 | qdev = &sh->dev[qd_idx]; |
3194 | r6s.q_failed = (s.failed >= 1 && r6s.failed_num[0] == qd_idx) | |
3195 | || (s.failed >= 2 && r6s.failed_num[1] == qd_idx); | |
a4456856 DW |
3196 | |
3197 | if ( s.written && | |
3198 | ( r6s.p_failed || ((test_bit(R5_Insync, &pdev->flags) | |
16a53ecc | 3199 | && !test_bit(R5_LOCKED, &pdev->flags) |
a4456856 DW |
3200 | && test_bit(R5_UPTODATE, &pdev->flags)))) && |
3201 | ( r6s.q_failed || ((test_bit(R5_Insync, &qdev->flags) | |
16a53ecc | 3202 | && !test_bit(R5_LOCKED, &qdev->flags) |
a4456856 | 3203 | && test_bit(R5_UPTODATE, &qdev->flags))))) |
1fe797e6 | 3204 | handle_stripe_clean_event(conf, sh, disks, &return_bi); |
16a53ecc N |
3205 | |
3206 | /* Now we might consider reading some blocks, either to check/generate | |
3207 | * parity, or to satisfy requests | |
3208 | * or to load a block that is being partially written. | |
3209 | */ | |
a4456856 DW |
3210 | if (s.to_read || s.non_overwrite || (s.to_write && s.failed) || |
3211 | (s.syncing && (s.uptodate < disks)) || s.expanding) | |
1fe797e6 | 3212 | handle_stripe_fill6(sh, &s, &r6s, disks); |
16a53ecc N |
3213 | |
3214 | /* now to consider writing and what else, if anything should be read */ | |
a4456856 | 3215 | if (s.to_write) |
1fe797e6 | 3216 | handle_stripe_dirtying6(conf, sh, &s, &r6s, disks); |
16a53ecc N |
3217 | |
3218 | /* maybe we need to check and possibly fix the parity for this stripe | |
a4456856 DW |
3219 | * Any reads will already have been scheduled, so we just see if enough |
3220 | * data is available | |
16a53ecc | 3221 | */ |
a4456856 | 3222 | if (s.syncing && s.locked == 0 && !test_bit(STRIPE_INSYNC, &sh->state)) |
36d1c647 | 3223 | handle_parity_checks6(conf, sh, &s, &r6s, disks); |
16a53ecc | 3224 | |
a4456856 | 3225 | if (s.syncing && s.locked == 0 && test_bit(STRIPE_INSYNC, &sh->state)) { |
16a53ecc N |
3226 | md_done_sync(conf->mddev, STRIPE_SECTORS,1); |
3227 | clear_bit(STRIPE_SYNCING, &sh->state); | |
3228 | } | |
3229 | ||
3230 | /* If the failed drives are just a ReadError, then we might need | |
3231 | * to progress the repair/check process | |
3232 | */ | |
a4456856 DW |
3233 | if (s.failed <= 2 && !conf->mddev->ro) |
3234 | for (i = 0; i < s.failed; i++) { | |
3235 | dev = &sh->dev[r6s.failed_num[i]]; | |
16a53ecc N |
3236 | if (test_bit(R5_ReadError, &dev->flags) |
3237 | && !test_bit(R5_LOCKED, &dev->flags) | |
3238 | && test_bit(R5_UPTODATE, &dev->flags) | |
3239 | ) { | |
3240 | if (!test_bit(R5_ReWrite, &dev->flags)) { | |
3241 | set_bit(R5_Wantwrite, &dev->flags); | |
3242 | set_bit(R5_ReWrite, &dev->flags); | |
3243 | set_bit(R5_LOCKED, &dev->flags); | |
3244 | } else { | |
3245 | /* let's read it back */ | |
3246 | set_bit(R5_Wantread, &dev->flags); | |
3247 | set_bit(R5_LOCKED, &dev->flags); | |
3248 | } | |
3249 | } | |
3250 | } | |
f416885e | 3251 | |
a4456856 | 3252 | if (s.expanded && test_bit(STRIPE_EXPANDING, &sh->state)) { |
ab69ae12 N |
3253 | struct stripe_head *sh2 |
3254 | = get_active_stripe(conf, sh->sector, 1, 1); | |
3255 | if (sh2 && test_bit(STRIPE_EXPAND_SOURCE, &sh2->state)) { | |
3256 | /* sh cannot be written until sh2 has been read. | |
3257 | * so arrange for sh to be delayed a little | |
3258 | */ | |
3259 | set_bit(STRIPE_DELAYED, &sh->state); | |
3260 | set_bit(STRIPE_HANDLE, &sh->state); | |
3261 | if (!test_and_set_bit(STRIPE_PREREAD_ACTIVE, | |
3262 | &sh2->state)) | |
3263 | atomic_inc(&conf->preread_active_stripes); | |
3264 | release_stripe(sh2); | |
3265 | goto unlock; | |
3266 | } | |
3267 | if (sh2) | |
3268 | release_stripe(sh2); | |
3269 | ||
f416885e N |
3270 | /* Need to write out all blocks after computing P&Q */ |
3271 | sh->disks = conf->raid_disks; | |
911d4ee8 | 3272 | stripe_set_idx(sh->sector, conf, 0, sh); |
f416885e N |
3273 | compute_parity6(sh, RECONSTRUCT_WRITE); |
3274 | for (i = conf->raid_disks ; i-- ; ) { | |
3275 | set_bit(R5_LOCKED, &sh->dev[i].flags); | |
a4456856 | 3276 | s.locked++; |
f416885e N |
3277 | set_bit(R5_Wantwrite, &sh->dev[i].flags); |
3278 | } | |
3279 | clear_bit(STRIPE_EXPANDING, &sh->state); | |
a4456856 | 3280 | } else if (s.expanded) { |
f416885e N |
3281 | clear_bit(STRIPE_EXPAND_READY, &sh->state); |
3282 | atomic_dec(&conf->reshape_stripes); | |
3283 | wake_up(&conf->wait_for_overlap); | |
3284 | md_done_sync(conf->mddev, STRIPE_SECTORS, 1); | |
3285 | } | |
3286 | ||
0f94e87c | 3287 | if (s.expanding && s.locked == 0 && |
976ea8d4 | 3288 | !test_bit(STRIPE_COMPUTE_RUN, &sh->state)) |
a4456856 | 3289 | handle_stripe_expansion(conf, sh, &r6s); |
f416885e | 3290 | |
6bfe0b49 | 3291 | unlock: |
16a53ecc N |
3292 | spin_unlock(&sh->lock); |
3293 | ||
6bfe0b49 DW |
3294 | /* wait for this device to become unblocked */ |
3295 | if (unlikely(blocked_rdev)) | |
3296 | md_wait_for_blocked_rdev(blocked_rdev, conf->mddev); | |
3297 | ||
f0e43bcd | 3298 | ops_run_io(sh, &s); |
16a53ecc | 3299 | |
f0e43bcd | 3300 | return_io(return_bi); |
df10cfbc DW |
3301 | |
3302 | return blocked_rdev == NULL; | |
16a53ecc N |
3303 | } |
3304 | ||
df10cfbc | 3305 | /* returns true if the stripe was handled */ |
36d1c647 | 3306 | static bool handle_stripe(struct stripe_head *sh) |
16a53ecc N |
3307 | { |
3308 | if (sh->raid_conf->level == 6) | |
36d1c647 | 3309 | return handle_stripe6(sh); |
16a53ecc | 3310 | else |
df10cfbc | 3311 | return handle_stripe5(sh); |
16a53ecc N |
3312 | } |
3313 | ||
16a53ecc N |
3314 | static void raid5_activate_delayed(raid5_conf_t *conf) |
3315 | { | |
3316 | if (atomic_read(&conf->preread_active_stripes) < IO_THRESHOLD) { | |
3317 | while (!list_empty(&conf->delayed_list)) { | |
3318 | struct list_head *l = conf->delayed_list.next; | |
3319 | struct stripe_head *sh; | |
3320 | sh = list_entry(l, struct stripe_head, lru); | |
3321 | list_del_init(l); | |
3322 | clear_bit(STRIPE_DELAYED, &sh->state); | |
3323 | if (!test_and_set_bit(STRIPE_PREREAD_ACTIVE, &sh->state)) | |
3324 | atomic_inc(&conf->preread_active_stripes); | |
8b3e6cdc | 3325 | list_add_tail(&sh->lru, &conf->hold_list); |
16a53ecc | 3326 | } |
6ed3003c N |
3327 | } else |
3328 | blk_plug_device(conf->mddev->queue); | |
16a53ecc N |
3329 | } |
3330 | ||
3331 | static void activate_bit_delay(raid5_conf_t *conf) | |
3332 | { | |
3333 | /* device_lock is held */ | |
3334 | struct list_head head; | |
3335 | list_add(&head, &conf->bitmap_list); | |
3336 | list_del_init(&conf->bitmap_list); | |
3337 | while (!list_empty(&head)) { | |
3338 | struct stripe_head *sh = list_entry(head.next, struct stripe_head, lru); | |
3339 | list_del_init(&sh->lru); | |
3340 | atomic_inc(&sh->count); | |
3341 | __release_stripe(conf, sh); | |
3342 | } | |
3343 | } | |
3344 | ||
3345 | static void unplug_slaves(mddev_t *mddev) | |
3346 | { | |
3347 | raid5_conf_t *conf = mddev_to_conf(mddev); | |
3348 | int i; | |
3349 | ||
3350 | rcu_read_lock(); | |
3351 | for (i=0; i<mddev->raid_disks; i++) { | |
3352 | mdk_rdev_t *rdev = rcu_dereference(conf->disks[i].rdev); | |
3353 | if (rdev && !test_bit(Faulty, &rdev->flags) && atomic_read(&rdev->nr_pending)) { | |
165125e1 | 3354 | struct request_queue *r_queue = bdev_get_queue(rdev->bdev); |
16a53ecc N |
3355 | |
3356 | atomic_inc(&rdev->nr_pending); | |
3357 | rcu_read_unlock(); | |
3358 | ||
2ad8b1ef | 3359 | blk_unplug(r_queue); |
16a53ecc N |
3360 | |
3361 | rdev_dec_pending(rdev, mddev); | |
3362 | rcu_read_lock(); | |
3363 | } | |
3364 | } | |
3365 | rcu_read_unlock(); | |
3366 | } | |
3367 | ||
165125e1 | 3368 | static void raid5_unplug_device(struct request_queue *q) |
16a53ecc N |
3369 | { |
3370 | mddev_t *mddev = q->queuedata; | |
3371 | raid5_conf_t *conf = mddev_to_conf(mddev); | |
3372 | unsigned long flags; | |
3373 | ||
3374 | spin_lock_irqsave(&conf->device_lock, flags); | |
3375 | ||
3376 | if (blk_remove_plug(q)) { | |
3377 | conf->seq_flush++; | |
3378 | raid5_activate_delayed(conf); | |
72626685 | 3379 | } |
1da177e4 LT |
3380 | md_wakeup_thread(mddev->thread); |
3381 | ||
3382 | spin_unlock_irqrestore(&conf->device_lock, flags); | |
3383 | ||
3384 | unplug_slaves(mddev); | |
3385 | } | |
3386 | ||
f022b2fd N |
3387 | static int raid5_congested(void *data, int bits) |
3388 | { | |
3389 | mddev_t *mddev = data; | |
3390 | raid5_conf_t *conf = mddev_to_conf(mddev); | |
3391 | ||
3392 | /* No difference between reads and writes. Just check | |
3393 | * how busy the stripe_cache is | |
3394 | */ | |
3395 | if (conf->inactive_blocked) | |
3396 | return 1; | |
3397 | if (conf->quiesce) | |
3398 | return 1; | |
3399 | if (list_empty_careful(&conf->inactive_list)) | |
3400 | return 1; | |
3401 | ||
3402 | return 0; | |
3403 | } | |
3404 | ||
23032a0e RBJ |
3405 | /* We want read requests to align with chunks where possible, |
3406 | * but write requests don't need to. | |
3407 | */ | |
cc371e66 AK |
3408 | static int raid5_mergeable_bvec(struct request_queue *q, |
3409 | struct bvec_merge_data *bvm, | |
3410 | struct bio_vec *biovec) | |
23032a0e RBJ |
3411 | { |
3412 | mddev_t *mddev = q->queuedata; | |
cc371e66 | 3413 | sector_t sector = bvm->bi_sector + get_start_sect(bvm->bi_bdev); |
23032a0e RBJ |
3414 | int max; |
3415 | unsigned int chunk_sectors = mddev->chunk_size >> 9; | |
cc371e66 | 3416 | unsigned int bio_sectors = bvm->bi_size >> 9; |
23032a0e | 3417 | |
cc371e66 | 3418 | if ((bvm->bi_rw & 1) == WRITE) |
23032a0e RBJ |
3419 | return biovec->bv_len; /* always allow writes to be mergeable */ |
3420 | ||
784052ec N |
3421 | if (mddev->new_chunk < mddev->chunk_size) |
3422 | chunk_sectors = mddev->new_chunk >> 9; | |
23032a0e RBJ |
3423 | max = (chunk_sectors - ((sector & (chunk_sectors - 1)) + bio_sectors)) << 9; |
3424 | if (max < 0) max = 0; | |
3425 | if (max <= biovec->bv_len && bio_sectors == 0) | |
3426 | return biovec->bv_len; | |
3427 | else | |
3428 | return max; | |
3429 | } | |
3430 | ||
f679623f RBJ |
3431 | |
3432 | static int in_chunk_boundary(mddev_t *mddev, struct bio *bio) | |
3433 | { | |
3434 | sector_t sector = bio->bi_sector + get_start_sect(bio->bi_bdev); | |
3435 | unsigned int chunk_sectors = mddev->chunk_size >> 9; | |
3436 | unsigned int bio_sectors = bio->bi_size >> 9; | |
3437 | ||
784052ec N |
3438 | if (mddev->new_chunk < mddev->chunk_size) |
3439 | chunk_sectors = mddev->new_chunk >> 9; | |
f679623f RBJ |
3440 | return chunk_sectors >= |
3441 | ((sector & (chunk_sectors - 1)) + bio_sectors); | |
3442 | } | |
3443 | ||
46031f9a RBJ |
3444 | /* |
3445 | * add bio to the retry LIFO ( in O(1) ... we are in interrupt ) | |
3446 | * later sampled by raid5d. | |
3447 | */ | |
3448 | static void add_bio_to_retry(struct bio *bi,raid5_conf_t *conf) | |
3449 | { | |
3450 | unsigned long flags; | |
3451 | ||
3452 | spin_lock_irqsave(&conf->device_lock, flags); | |
3453 | ||
3454 | bi->bi_next = conf->retry_read_aligned_list; | |
3455 | conf->retry_read_aligned_list = bi; | |
3456 | ||
3457 | spin_unlock_irqrestore(&conf->device_lock, flags); | |
3458 | md_wakeup_thread(conf->mddev->thread); | |
3459 | } | |
3460 | ||
3461 | ||
3462 | static struct bio *remove_bio_from_retry(raid5_conf_t *conf) | |
3463 | { | |
3464 | struct bio *bi; | |
3465 | ||
3466 | bi = conf->retry_read_aligned; | |
3467 | if (bi) { | |
3468 | conf->retry_read_aligned = NULL; | |
3469 | return bi; | |
3470 | } | |
3471 | bi = conf->retry_read_aligned_list; | |
3472 | if(bi) { | |
387bb173 | 3473 | conf->retry_read_aligned_list = bi->bi_next; |
46031f9a | 3474 | bi->bi_next = NULL; |
960e739d JA |
3475 | /* |
3476 | * this sets the active strip count to 1 and the processed | |
3477 | * strip count to zero (upper 8 bits) | |
3478 | */ | |
46031f9a | 3479 | bi->bi_phys_segments = 1; /* biased count of active stripes */ |
46031f9a RBJ |
3480 | } |
3481 | ||
3482 | return bi; | |
3483 | } | |
3484 | ||
3485 | ||
f679623f RBJ |
3486 | /* |
3487 | * The "raid5_align_endio" should check if the read succeeded and if it | |
3488 | * did, call bio_endio on the original bio (having bio_put the new bio | |
3489 | * first). | |
3490 | * If the read failed.. | |
3491 | */ | |
6712ecf8 | 3492 | static void raid5_align_endio(struct bio *bi, int error) |
f679623f RBJ |
3493 | { |
3494 | struct bio* raid_bi = bi->bi_private; | |
46031f9a RBJ |
3495 | mddev_t *mddev; |
3496 | raid5_conf_t *conf; | |
3497 | int uptodate = test_bit(BIO_UPTODATE, &bi->bi_flags); | |
3498 | mdk_rdev_t *rdev; | |
3499 | ||
f679623f | 3500 | bio_put(bi); |
46031f9a RBJ |
3501 | |
3502 | mddev = raid_bi->bi_bdev->bd_disk->queue->queuedata; | |
3503 | conf = mddev_to_conf(mddev); | |
3504 | rdev = (void*)raid_bi->bi_next; | |
3505 | raid_bi->bi_next = NULL; | |
3506 | ||
3507 | rdev_dec_pending(rdev, conf->mddev); | |
3508 | ||
3509 | if (!error && uptodate) { | |
6712ecf8 | 3510 | bio_endio(raid_bi, 0); |
46031f9a RBJ |
3511 | if (atomic_dec_and_test(&conf->active_aligned_reads)) |
3512 | wake_up(&conf->wait_for_stripe); | |
6712ecf8 | 3513 | return; |
46031f9a RBJ |
3514 | } |
3515 | ||
3516 | ||
45b4233c | 3517 | pr_debug("raid5_align_endio : io error...handing IO for a retry\n"); |
46031f9a RBJ |
3518 | |
3519 | add_bio_to_retry(raid_bi, conf); | |
f679623f RBJ |
3520 | } |
3521 | ||
387bb173 NB |
3522 | static int bio_fits_rdev(struct bio *bi) |
3523 | { | |
165125e1 | 3524 | struct request_queue *q = bdev_get_queue(bi->bi_bdev); |
387bb173 NB |
3525 | |
3526 | if ((bi->bi_size>>9) > q->max_sectors) | |
3527 | return 0; | |
3528 | blk_recount_segments(q, bi); | |
960e739d | 3529 | if (bi->bi_phys_segments > q->max_phys_segments) |
387bb173 NB |
3530 | return 0; |
3531 | ||
3532 | if (q->merge_bvec_fn) | |
3533 | /* it's too hard to apply the merge_bvec_fn at this stage, | |
3534 | * just just give up | |
3535 | */ | |
3536 | return 0; | |
3537 | ||
3538 | return 1; | |
3539 | } | |
3540 | ||
3541 | ||
165125e1 | 3542 | static int chunk_aligned_read(struct request_queue *q, struct bio * raid_bio) |
f679623f RBJ |
3543 | { |
3544 | mddev_t *mddev = q->queuedata; | |
3545 | raid5_conf_t *conf = mddev_to_conf(mddev); | |
911d4ee8 | 3546 | unsigned int dd_idx; |
f679623f RBJ |
3547 | struct bio* align_bi; |
3548 | mdk_rdev_t *rdev; | |
3549 | ||
3550 | if (!in_chunk_boundary(mddev, raid_bio)) { | |
45b4233c | 3551 | pr_debug("chunk_aligned_read : non aligned\n"); |
f679623f RBJ |
3552 | return 0; |
3553 | } | |
3554 | /* | |
99c0fb5f | 3555 | * use bio_clone to make a copy of the bio |
f679623f RBJ |
3556 | */ |
3557 | align_bi = bio_clone(raid_bio, GFP_NOIO); | |
3558 | if (!align_bi) | |
3559 | return 0; | |
3560 | /* | |
3561 | * set bi_end_io to a new function, and set bi_private to the | |
3562 | * original bio. | |
3563 | */ | |
3564 | align_bi->bi_end_io = raid5_align_endio; | |
3565 | align_bi->bi_private = raid_bio; | |
3566 | /* | |
3567 | * compute position | |
3568 | */ | |
112bf897 N |
3569 | align_bi->bi_sector = raid5_compute_sector(conf, raid_bio->bi_sector, |
3570 | 0, | |
911d4ee8 | 3571 | &dd_idx, NULL); |
f679623f RBJ |
3572 | |
3573 | rcu_read_lock(); | |
3574 | rdev = rcu_dereference(conf->disks[dd_idx].rdev); | |
3575 | if (rdev && test_bit(In_sync, &rdev->flags)) { | |
f679623f RBJ |
3576 | atomic_inc(&rdev->nr_pending); |
3577 | rcu_read_unlock(); | |
46031f9a RBJ |
3578 | raid_bio->bi_next = (void*)rdev; |
3579 | align_bi->bi_bdev = rdev->bdev; | |
3580 | align_bi->bi_flags &= ~(1 << BIO_SEG_VALID); | |
3581 | align_bi->bi_sector += rdev->data_offset; | |
3582 | ||
387bb173 NB |
3583 | if (!bio_fits_rdev(align_bi)) { |
3584 | /* too big in some way */ | |
3585 | bio_put(align_bi); | |
3586 | rdev_dec_pending(rdev, mddev); | |
3587 | return 0; | |
3588 | } | |
3589 | ||
46031f9a RBJ |
3590 | spin_lock_irq(&conf->device_lock); |
3591 | wait_event_lock_irq(conf->wait_for_stripe, | |
3592 | conf->quiesce == 0, | |
3593 | conf->device_lock, /* nothing */); | |
3594 | atomic_inc(&conf->active_aligned_reads); | |
3595 | spin_unlock_irq(&conf->device_lock); | |
3596 | ||
f679623f RBJ |
3597 | generic_make_request(align_bi); |
3598 | return 1; | |
3599 | } else { | |
3600 | rcu_read_unlock(); | |
46031f9a | 3601 | bio_put(align_bi); |
f679623f RBJ |
3602 | return 0; |
3603 | } | |
3604 | } | |
3605 | ||
8b3e6cdc DW |
3606 | /* __get_priority_stripe - get the next stripe to process |
3607 | * | |
3608 | * Full stripe writes are allowed to pass preread active stripes up until | |
3609 | * the bypass_threshold is exceeded. In general the bypass_count | |
3610 | * increments when the handle_list is handled before the hold_list; however, it | |
3611 | * will not be incremented when STRIPE_IO_STARTED is sampled set signifying a | |
3612 | * stripe with in flight i/o. The bypass_count will be reset when the | |
3613 | * head of the hold_list has changed, i.e. the head was promoted to the | |
3614 | * handle_list. | |
3615 | */ | |
3616 | static struct stripe_head *__get_priority_stripe(raid5_conf_t *conf) | |
3617 | { | |
3618 | struct stripe_head *sh; | |
3619 | ||
3620 | pr_debug("%s: handle: %s hold: %s full_writes: %d bypass_count: %d\n", | |
3621 | __func__, | |
3622 | list_empty(&conf->handle_list) ? "empty" : "busy", | |
3623 | list_empty(&conf->hold_list) ? "empty" : "busy", | |
3624 | atomic_read(&conf->pending_full_writes), conf->bypass_count); | |
3625 | ||
3626 | if (!list_empty(&conf->handle_list)) { | |
3627 | sh = list_entry(conf->handle_list.next, typeof(*sh), lru); | |
3628 | ||
3629 | if (list_empty(&conf->hold_list)) | |
3630 | conf->bypass_count = 0; | |
3631 | else if (!test_bit(STRIPE_IO_STARTED, &sh->state)) { | |
3632 | if (conf->hold_list.next == conf->last_hold) | |
3633 | conf->bypass_count++; | |
3634 | else { | |
3635 | conf->last_hold = conf->hold_list.next; | |
3636 | conf->bypass_count -= conf->bypass_threshold; | |
3637 | if (conf->bypass_count < 0) | |
3638 | conf->bypass_count = 0; | |
3639 | } | |
3640 | } | |
3641 | } else if (!list_empty(&conf->hold_list) && | |
3642 | ((conf->bypass_threshold && | |
3643 | conf->bypass_count > conf->bypass_threshold) || | |
3644 | atomic_read(&conf->pending_full_writes) == 0)) { | |
3645 | sh = list_entry(conf->hold_list.next, | |
3646 | typeof(*sh), lru); | |
3647 | conf->bypass_count -= conf->bypass_threshold; | |
3648 | if (conf->bypass_count < 0) | |
3649 | conf->bypass_count = 0; | |
3650 | } else | |
3651 | return NULL; | |
3652 | ||
3653 | list_del_init(&sh->lru); | |
3654 | atomic_inc(&sh->count); | |
3655 | BUG_ON(atomic_read(&sh->count) != 1); | |
3656 | return sh; | |
3657 | } | |
f679623f | 3658 | |
165125e1 | 3659 | static int make_request(struct request_queue *q, struct bio * bi) |
1da177e4 LT |
3660 | { |
3661 | mddev_t *mddev = q->queuedata; | |
3662 | raid5_conf_t *conf = mddev_to_conf(mddev); | |
911d4ee8 | 3663 | int dd_idx; |
1da177e4 LT |
3664 | sector_t new_sector; |
3665 | sector_t logical_sector, last_sector; | |
3666 | struct stripe_head *sh; | |
a362357b | 3667 | const int rw = bio_data_dir(bi); |
c9959059 | 3668 | int cpu, remaining; |
1da177e4 | 3669 | |
e5dcdd80 | 3670 | if (unlikely(bio_barrier(bi))) { |
6712ecf8 | 3671 | bio_endio(bi, -EOPNOTSUPP); |
e5dcdd80 N |
3672 | return 0; |
3673 | } | |
3674 | ||
3d310eb7 | 3675 | md_write_start(mddev, bi); |
06d91a5f | 3676 | |
074a7aca TH |
3677 | cpu = part_stat_lock(); |
3678 | part_stat_inc(cpu, &mddev->gendisk->part0, ios[rw]); | |
3679 | part_stat_add(cpu, &mddev->gendisk->part0, sectors[rw], | |
3680 | bio_sectors(bi)); | |
3681 | part_stat_unlock(); | |
1da177e4 | 3682 | |
802ba064 | 3683 | if (rw == READ && |
52488615 RBJ |
3684 | mddev->reshape_position == MaxSector && |
3685 | chunk_aligned_read(q,bi)) | |
99c0fb5f | 3686 | return 0; |
52488615 | 3687 | |
1da177e4 LT |
3688 | logical_sector = bi->bi_sector & ~((sector_t)STRIPE_SECTORS-1); |
3689 | last_sector = bi->bi_sector + (bi->bi_size>>9); | |
3690 | bi->bi_next = NULL; | |
3691 | bi->bi_phys_segments = 1; /* over-loaded to count active stripes */ | |
06d91a5f | 3692 | |
1da177e4 LT |
3693 | for (;logical_sector < last_sector; logical_sector += STRIPE_SECTORS) { |
3694 | DEFINE_WAIT(w); | |
16a53ecc | 3695 | int disks, data_disks; |
b5663ba4 | 3696 | int previous; |
b578d55f | 3697 | |
7ecaa1e6 | 3698 | retry: |
b5663ba4 | 3699 | previous = 0; |
b0f9ec04 | 3700 | disks = conf->raid_disks; |
b578d55f | 3701 | prepare_to_wait(&conf->wait_for_overlap, &w, TASK_UNINTERRUPTIBLE); |
b0f9ec04 | 3702 | if (unlikely(conf->reshape_progress != MaxSector)) { |
fef9c61f | 3703 | /* spinlock is needed as reshape_progress may be |
df8e7f76 N |
3704 | * 64bit on a 32bit platform, and so it might be |
3705 | * possible to see a half-updated value | |
fef9c61f | 3706 | * Ofcourse reshape_progress could change after |
df8e7f76 N |
3707 | * the lock is dropped, so once we get a reference |
3708 | * to the stripe that we think it is, we will have | |
3709 | * to check again. | |
3710 | */ | |
7ecaa1e6 | 3711 | spin_lock_irq(&conf->device_lock); |
fef9c61f N |
3712 | if (mddev->delta_disks < 0 |
3713 | ? logical_sector < conf->reshape_progress | |
3714 | : logical_sector >= conf->reshape_progress) { | |
7ecaa1e6 | 3715 | disks = conf->previous_raid_disks; |
b5663ba4 N |
3716 | previous = 1; |
3717 | } else { | |
fef9c61f N |
3718 | if (mddev->delta_disks < 0 |
3719 | ? logical_sector < conf->reshape_safe | |
3720 | : logical_sector >= conf->reshape_safe) { | |
b578d55f N |
3721 | spin_unlock_irq(&conf->device_lock); |
3722 | schedule(); | |
3723 | goto retry; | |
3724 | } | |
3725 | } | |
7ecaa1e6 N |
3726 | spin_unlock_irq(&conf->device_lock); |
3727 | } | |
16a53ecc N |
3728 | data_disks = disks - conf->max_degraded; |
3729 | ||
112bf897 N |
3730 | new_sector = raid5_compute_sector(conf, logical_sector, |
3731 | previous, | |
911d4ee8 | 3732 | &dd_idx, NULL); |
45b4233c | 3733 | pr_debug("raid5: make_request, sector %llu logical %llu\n", |
1da177e4 LT |
3734 | (unsigned long long)new_sector, |
3735 | (unsigned long long)logical_sector); | |
3736 | ||
b5663ba4 N |
3737 | sh = get_active_stripe(conf, new_sector, previous, |
3738 | (bi->bi_rw&RWA_MASK)); | |
1da177e4 | 3739 | if (sh) { |
b0f9ec04 | 3740 | if (unlikely(previous)) { |
7ecaa1e6 | 3741 | /* expansion might have moved on while waiting for a |
df8e7f76 N |
3742 | * stripe, so we must do the range check again. |
3743 | * Expansion could still move past after this | |
3744 | * test, but as we are holding a reference to | |
3745 | * 'sh', we know that if that happens, | |
3746 | * STRIPE_EXPANDING will get set and the expansion | |
3747 | * won't proceed until we finish with the stripe. | |
7ecaa1e6 N |
3748 | */ |
3749 | int must_retry = 0; | |
3750 | spin_lock_irq(&conf->device_lock); | |
b0f9ec04 N |
3751 | if (mddev->delta_disks < 0 |
3752 | ? logical_sector >= conf->reshape_progress | |
3753 | : logical_sector < conf->reshape_progress) | |
7ecaa1e6 N |
3754 | /* mismatch, need to try again */ |
3755 | must_retry = 1; | |
3756 | spin_unlock_irq(&conf->device_lock); | |
3757 | if (must_retry) { | |
3758 | release_stripe(sh); | |
3759 | goto retry; | |
3760 | } | |
3761 | } | |
e464eafd N |
3762 | /* FIXME what if we get a false positive because these |
3763 | * are being updated. | |
3764 | */ | |
3765 | if (logical_sector >= mddev->suspend_lo && | |
3766 | logical_sector < mddev->suspend_hi) { | |
3767 | release_stripe(sh); | |
3768 | schedule(); | |
3769 | goto retry; | |
3770 | } | |
7ecaa1e6 N |
3771 | |
3772 | if (test_bit(STRIPE_EXPANDING, &sh->state) || | |
3773 | !add_stripe_bio(sh, bi, dd_idx, (bi->bi_rw&RW_MASK))) { | |
3774 | /* Stripe is busy expanding or | |
3775 | * add failed due to overlap. Flush everything | |
1da177e4 LT |
3776 | * and wait a while |
3777 | */ | |
3778 | raid5_unplug_device(mddev->queue); | |
3779 | release_stripe(sh); | |
3780 | schedule(); | |
3781 | goto retry; | |
3782 | } | |
3783 | finish_wait(&conf->wait_for_overlap, &w); | |
6ed3003c N |
3784 | set_bit(STRIPE_HANDLE, &sh->state); |
3785 | clear_bit(STRIPE_DELAYED, &sh->state); | |
1da177e4 | 3786 | release_stripe(sh); |
1da177e4 LT |
3787 | } else { |
3788 | /* cannot get stripe for read-ahead, just give-up */ | |
3789 | clear_bit(BIO_UPTODATE, &bi->bi_flags); | |
3790 | finish_wait(&conf->wait_for_overlap, &w); | |
3791 | break; | |
3792 | } | |
3793 | ||
3794 | } | |
3795 | spin_lock_irq(&conf->device_lock); | |
960e739d | 3796 | remaining = raid5_dec_bi_phys_segments(bi); |
f6344757 N |
3797 | spin_unlock_irq(&conf->device_lock); |
3798 | if (remaining == 0) { | |
1da177e4 | 3799 | |
16a53ecc | 3800 | if ( rw == WRITE ) |
1da177e4 | 3801 | md_write_end(mddev); |
6712ecf8 | 3802 | |
0e13fe23 | 3803 | bio_endio(bi, 0); |
1da177e4 | 3804 | } |
1da177e4 LT |
3805 | return 0; |
3806 | } | |
3807 | ||
b522adcd DW |
3808 | static sector_t raid5_size(mddev_t *mddev, sector_t sectors, int raid_disks); |
3809 | ||
52c03291 | 3810 | static sector_t reshape_request(mddev_t *mddev, sector_t sector_nr, int *skipped) |
1da177e4 | 3811 | { |
52c03291 N |
3812 | /* reshaping is quite different to recovery/resync so it is |
3813 | * handled quite separately ... here. | |
3814 | * | |
3815 | * On each call to sync_request, we gather one chunk worth of | |
3816 | * destination stripes and flag them as expanding. | |
3817 | * Then we find all the source stripes and request reads. | |
3818 | * As the reads complete, handle_stripe will copy the data | |
3819 | * into the destination stripe and release that stripe. | |
3820 | */ | |
1da177e4 LT |
3821 | raid5_conf_t *conf = (raid5_conf_t *) mddev->private; |
3822 | struct stripe_head *sh; | |
ccfcc3c1 | 3823 | sector_t first_sector, last_sector; |
f416885e N |
3824 | int raid_disks = conf->previous_raid_disks; |
3825 | int data_disks = raid_disks - conf->max_degraded; | |
3826 | int new_data_disks = conf->raid_disks - conf->max_degraded; | |
52c03291 N |
3827 | int i; |
3828 | int dd_idx; | |
c8f517c4 | 3829 | sector_t writepos, readpos, safepos; |
ec32a2bd | 3830 | sector_t stripe_addr; |
7a661381 | 3831 | int reshape_sectors; |
ab69ae12 | 3832 | struct list_head stripes; |
52c03291 | 3833 | |
fef9c61f N |
3834 | if (sector_nr == 0) { |
3835 | /* If restarting in the middle, skip the initial sectors */ | |
3836 | if (mddev->delta_disks < 0 && | |
3837 | conf->reshape_progress < raid5_size(mddev, 0, 0)) { | |
3838 | sector_nr = raid5_size(mddev, 0, 0) | |
3839 | - conf->reshape_progress; | |
3840 | } else if (mddev->delta_disks > 0 && | |
3841 | conf->reshape_progress > 0) | |
3842 | sector_nr = conf->reshape_progress; | |
f416885e | 3843 | sector_div(sector_nr, new_data_disks); |
fef9c61f N |
3844 | if (sector_nr) { |
3845 | *skipped = 1; | |
3846 | return sector_nr; | |
3847 | } | |
52c03291 N |
3848 | } |
3849 | ||
7a661381 N |
3850 | /* We need to process a full chunk at a time. |
3851 | * If old and new chunk sizes differ, we need to process the | |
3852 | * largest of these | |
3853 | */ | |
3854 | if (mddev->new_chunk > mddev->chunk_size) | |
3855 | reshape_sectors = mddev->new_chunk / 512; | |
3856 | else | |
3857 | reshape_sectors = mddev->chunk_size / 512; | |
3858 | ||
52c03291 N |
3859 | /* we update the metadata when there is more than 3Meg |
3860 | * in the block range (that is rather arbitrary, should | |
3861 | * probably be time based) or when the data about to be | |
3862 | * copied would over-write the source of the data at | |
3863 | * the front of the range. | |
fef9c61f N |
3864 | * i.e. one new_stripe along from reshape_progress new_maps |
3865 | * to after where reshape_safe old_maps to | |
52c03291 | 3866 | */ |
fef9c61f | 3867 | writepos = conf->reshape_progress; |
f416885e | 3868 | sector_div(writepos, new_data_disks); |
c8f517c4 N |
3869 | readpos = conf->reshape_progress; |
3870 | sector_div(readpos, data_disks); | |
fef9c61f | 3871 | safepos = conf->reshape_safe; |
f416885e | 3872 | sector_div(safepos, data_disks); |
fef9c61f | 3873 | if (mddev->delta_disks < 0) { |
7a661381 | 3874 | writepos -= reshape_sectors; |
c8f517c4 | 3875 | readpos += reshape_sectors; |
7a661381 | 3876 | safepos += reshape_sectors; |
fef9c61f | 3877 | } else { |
7a661381 | 3878 | writepos += reshape_sectors; |
c8f517c4 | 3879 | readpos -= reshape_sectors; |
7a661381 | 3880 | safepos -= reshape_sectors; |
fef9c61f | 3881 | } |
52c03291 | 3882 | |
c8f517c4 N |
3883 | /* 'writepos' is the most advanced device address we might write. |
3884 | * 'readpos' is the least advanced device address we might read. | |
3885 | * 'safepos' is the least address recorded in the metadata as having | |
3886 | * been reshaped. | |
3887 | * If 'readpos' is behind 'writepos', then there is no way that we can | |
3888 | * ensure safety in the face of a crash - that must be done by userspace | |
3889 | * making a backup of the data. So in that case there is no particular | |
3890 | * rush to update metadata. | |
3891 | * Otherwise if 'safepos' is behind 'writepos', then we really need to | |
3892 | * update the metadata to advance 'safepos' to match 'readpos' so that | |
3893 | * we can be safe in the event of a crash. | |
3894 | * So we insist on updating metadata if safepos is behind writepos and | |
3895 | * readpos is beyond writepos. | |
3896 | * In any case, update the metadata every 10 seconds. | |
3897 | * Maybe that number should be configurable, but I'm not sure it is | |
3898 | * worth it.... maybe it could be a multiple of safemode_delay??? | |
3899 | */ | |
fef9c61f | 3900 | if ((mddev->delta_disks < 0 |
c8f517c4 N |
3901 | ? (safepos > writepos && readpos < writepos) |
3902 | : (safepos < writepos && readpos > writepos)) || | |
3903 | time_after(jiffies, conf->reshape_checkpoint + 10*HZ)) { | |
52c03291 N |
3904 | /* Cannot proceed until we've updated the superblock... */ |
3905 | wait_event(conf->wait_for_overlap, | |
3906 | atomic_read(&conf->reshape_stripes)==0); | |
fef9c61f | 3907 | mddev->reshape_position = conf->reshape_progress; |
c8f517c4 | 3908 | conf->reshape_checkpoint = jiffies; |
850b2b42 | 3909 | set_bit(MD_CHANGE_DEVS, &mddev->flags); |
52c03291 | 3910 | md_wakeup_thread(mddev->thread); |
850b2b42 | 3911 | wait_event(mddev->sb_wait, mddev->flags == 0 || |
52c03291 N |
3912 | kthread_should_stop()); |
3913 | spin_lock_irq(&conf->device_lock); | |
fef9c61f | 3914 | conf->reshape_safe = mddev->reshape_position; |
52c03291 N |
3915 | spin_unlock_irq(&conf->device_lock); |
3916 | wake_up(&conf->wait_for_overlap); | |
3917 | } | |
3918 | ||
ec32a2bd N |
3919 | if (mddev->delta_disks < 0) { |
3920 | BUG_ON(conf->reshape_progress == 0); | |
3921 | stripe_addr = writepos; | |
3922 | BUG_ON((mddev->dev_sectors & | |
7a661381 N |
3923 | ~((sector_t)reshape_sectors - 1)) |
3924 | - reshape_sectors - stripe_addr | |
ec32a2bd N |
3925 | != sector_nr); |
3926 | } else { | |
7a661381 | 3927 | BUG_ON(writepos != sector_nr + reshape_sectors); |
ec32a2bd N |
3928 | stripe_addr = sector_nr; |
3929 | } | |
ab69ae12 | 3930 | INIT_LIST_HEAD(&stripes); |
7a661381 | 3931 | for (i = 0; i < reshape_sectors; i += STRIPE_SECTORS) { |
52c03291 N |
3932 | int j; |
3933 | int skipped = 0; | |
ec32a2bd | 3934 | sh = get_active_stripe(conf, stripe_addr+i, 0, 0); |
52c03291 N |
3935 | set_bit(STRIPE_EXPANDING, &sh->state); |
3936 | atomic_inc(&conf->reshape_stripes); | |
3937 | /* If any of this stripe is beyond the end of the old | |
3938 | * array, then we need to zero those blocks | |
3939 | */ | |
3940 | for (j=sh->disks; j--;) { | |
3941 | sector_t s; | |
3942 | if (j == sh->pd_idx) | |
3943 | continue; | |
f416885e | 3944 | if (conf->level == 6 && |
d0dabf7e | 3945 | j == sh->qd_idx) |
f416885e | 3946 | continue; |
784052ec | 3947 | s = compute_blocknr(sh, j, 0); |
b522adcd | 3948 | if (s < raid5_size(mddev, 0, 0)) { |
52c03291 N |
3949 | skipped = 1; |
3950 | continue; | |
3951 | } | |
3952 | memset(page_address(sh->dev[j].page), 0, STRIPE_SIZE); | |
3953 | set_bit(R5_Expanded, &sh->dev[j].flags); | |
3954 | set_bit(R5_UPTODATE, &sh->dev[j].flags); | |
3955 | } | |
3956 | if (!skipped) { | |
3957 | set_bit(STRIPE_EXPAND_READY, &sh->state); | |
3958 | set_bit(STRIPE_HANDLE, &sh->state); | |
3959 | } | |
ab69ae12 | 3960 | list_add(&sh->lru, &stripes); |
52c03291 N |
3961 | } |
3962 | spin_lock_irq(&conf->device_lock); | |
fef9c61f | 3963 | if (mddev->delta_disks < 0) |
7a661381 | 3964 | conf->reshape_progress -= reshape_sectors * new_data_disks; |
fef9c61f | 3965 | else |
7a661381 | 3966 | conf->reshape_progress += reshape_sectors * new_data_disks; |
52c03291 N |
3967 | spin_unlock_irq(&conf->device_lock); |
3968 | /* Ok, those stripe are ready. We can start scheduling | |
3969 | * reads on the source stripes. | |
3970 | * The source stripes are determined by mapping the first and last | |
3971 | * block on the destination stripes. | |
3972 | */ | |
52c03291 | 3973 | first_sector = |
ec32a2bd | 3974 | raid5_compute_sector(conf, stripe_addr*(new_data_disks), |
911d4ee8 | 3975 | 1, &dd_idx, NULL); |
52c03291 | 3976 | last_sector = |
ec32a2bd | 3977 | raid5_compute_sector(conf, ((stripe_addr+conf->chunk_size/512) |
112bf897 | 3978 | *(new_data_disks) - 1), |
911d4ee8 | 3979 | 1, &dd_idx, NULL); |
58c0fed4 AN |
3980 | if (last_sector >= mddev->dev_sectors) |
3981 | last_sector = mddev->dev_sectors - 1; | |
52c03291 | 3982 | while (first_sector <= last_sector) { |
b5663ba4 | 3983 | sh = get_active_stripe(conf, first_sector, 1, 0); |
52c03291 N |
3984 | set_bit(STRIPE_EXPAND_SOURCE, &sh->state); |
3985 | set_bit(STRIPE_HANDLE, &sh->state); | |
3986 | release_stripe(sh); | |
3987 | first_sector += STRIPE_SECTORS; | |
3988 | } | |
ab69ae12 N |
3989 | /* Now that the sources are clearly marked, we can release |
3990 | * the destination stripes | |
3991 | */ | |
3992 | while (!list_empty(&stripes)) { | |
3993 | sh = list_entry(stripes.next, struct stripe_head, lru); | |
3994 | list_del_init(&sh->lru); | |
3995 | release_stripe(sh); | |
3996 | } | |
c6207277 N |
3997 | /* If this takes us to the resync_max point where we have to pause, |
3998 | * then we need to write out the superblock. | |
3999 | */ | |
7a661381 | 4000 | sector_nr += reshape_sectors; |
c6207277 N |
4001 | if (sector_nr >= mddev->resync_max) { |
4002 | /* Cannot proceed until we've updated the superblock... */ | |
4003 | wait_event(conf->wait_for_overlap, | |
4004 | atomic_read(&conf->reshape_stripes) == 0); | |
fef9c61f | 4005 | mddev->reshape_position = conf->reshape_progress; |
c8f517c4 | 4006 | conf->reshape_checkpoint = jiffies; |
c6207277 N |
4007 | set_bit(MD_CHANGE_DEVS, &mddev->flags); |
4008 | md_wakeup_thread(mddev->thread); | |
4009 | wait_event(mddev->sb_wait, | |
4010 | !test_bit(MD_CHANGE_DEVS, &mddev->flags) | |
4011 | || kthread_should_stop()); | |
4012 | spin_lock_irq(&conf->device_lock); | |
fef9c61f | 4013 | conf->reshape_safe = mddev->reshape_position; |
c6207277 N |
4014 | spin_unlock_irq(&conf->device_lock); |
4015 | wake_up(&conf->wait_for_overlap); | |
4016 | } | |
7a661381 | 4017 | return reshape_sectors; |
52c03291 N |
4018 | } |
4019 | ||
4020 | /* FIXME go_faster isn't used */ | |
4021 | static inline sector_t sync_request(mddev_t *mddev, sector_t sector_nr, int *skipped, int go_faster) | |
4022 | { | |
4023 | raid5_conf_t *conf = (raid5_conf_t *) mddev->private; | |
4024 | struct stripe_head *sh; | |
58c0fed4 | 4025 | sector_t max_sector = mddev->dev_sectors; |
72626685 | 4026 | int sync_blocks; |
16a53ecc N |
4027 | int still_degraded = 0; |
4028 | int i; | |
1da177e4 | 4029 | |
72626685 | 4030 | if (sector_nr >= max_sector) { |
1da177e4 LT |
4031 | /* just being told to finish up .. nothing much to do */ |
4032 | unplug_slaves(mddev); | |
cea9c228 | 4033 | |
29269553 N |
4034 | if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)) { |
4035 | end_reshape(conf); | |
4036 | return 0; | |
4037 | } | |
72626685 N |
4038 | |
4039 | if (mddev->curr_resync < max_sector) /* aborted */ | |
4040 | bitmap_end_sync(mddev->bitmap, mddev->curr_resync, | |
4041 | &sync_blocks, 1); | |
16a53ecc | 4042 | else /* completed sync */ |
72626685 N |
4043 | conf->fullsync = 0; |
4044 | bitmap_close_sync(mddev->bitmap); | |
4045 | ||
1da177e4 LT |
4046 | return 0; |
4047 | } | |
ccfcc3c1 | 4048 | |
52c03291 N |
4049 | if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)) |
4050 | return reshape_request(mddev, sector_nr, skipped); | |
f6705578 | 4051 | |
c6207277 N |
4052 | /* No need to check resync_max as we never do more than one |
4053 | * stripe, and as resync_max will always be on a chunk boundary, | |
4054 | * if the check in md_do_sync didn't fire, there is no chance | |
4055 | * of overstepping resync_max here | |
4056 | */ | |
4057 | ||
16a53ecc | 4058 | /* if there is too many failed drives and we are trying |
1da177e4 LT |
4059 | * to resync, then assert that we are finished, because there is |
4060 | * nothing we can do. | |
4061 | */ | |
3285edf1 | 4062 | if (mddev->degraded >= conf->max_degraded && |
16a53ecc | 4063 | test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) { |
58c0fed4 | 4064 | sector_t rv = mddev->dev_sectors - sector_nr; |
57afd89f | 4065 | *skipped = 1; |
1da177e4 LT |
4066 | return rv; |
4067 | } | |
72626685 | 4068 | if (!bitmap_start_sync(mddev->bitmap, sector_nr, &sync_blocks, 1) && |
3855ad9f | 4069 | !test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery) && |
72626685 N |
4070 | !conf->fullsync && sync_blocks >= STRIPE_SECTORS) { |
4071 | /* we can skip this block, and probably more */ | |
4072 | sync_blocks /= STRIPE_SECTORS; | |
4073 | *skipped = 1; | |
4074 | return sync_blocks * STRIPE_SECTORS; /* keep things rounded to whole stripes */ | |
4075 | } | |
1da177e4 | 4076 | |
b47490c9 N |
4077 | |
4078 | bitmap_cond_end_sync(mddev->bitmap, sector_nr); | |
4079 | ||
b5663ba4 | 4080 | sh = get_active_stripe(conf, sector_nr, 0, 1); |
1da177e4 | 4081 | if (sh == NULL) { |
b5663ba4 | 4082 | sh = get_active_stripe(conf, sector_nr, 0, 0); |
1da177e4 | 4083 | /* make sure we don't swamp the stripe cache if someone else |
16a53ecc | 4084 | * is trying to get access |
1da177e4 | 4085 | */ |
66c006a5 | 4086 | schedule_timeout_uninterruptible(1); |
1da177e4 | 4087 | } |
16a53ecc N |
4088 | /* Need to check if array will still be degraded after recovery/resync |
4089 | * We don't need to check the 'failed' flag as when that gets set, | |
4090 | * recovery aborts. | |
4091 | */ | |
4092 | for (i=0; i<mddev->raid_disks; i++) | |
4093 | if (conf->disks[i].rdev == NULL) | |
4094 | still_degraded = 1; | |
4095 | ||
4096 | bitmap_start_sync(mddev->bitmap, sector_nr, &sync_blocks, still_degraded); | |
4097 | ||
4098 | spin_lock(&sh->lock); | |
1da177e4 LT |
4099 | set_bit(STRIPE_SYNCING, &sh->state); |
4100 | clear_bit(STRIPE_INSYNC, &sh->state); | |
4101 | spin_unlock(&sh->lock); | |
4102 | ||
df10cfbc | 4103 | /* wait for any blocked device to be handled */ |
36d1c647 | 4104 | while (unlikely(!handle_stripe(sh))) |
df10cfbc | 4105 | ; |
1da177e4 LT |
4106 | release_stripe(sh); |
4107 | ||
4108 | return STRIPE_SECTORS; | |
4109 | } | |
4110 | ||
46031f9a RBJ |
4111 | static int retry_aligned_read(raid5_conf_t *conf, struct bio *raid_bio) |
4112 | { | |
4113 | /* We may not be able to submit a whole bio at once as there | |
4114 | * may not be enough stripe_heads available. | |
4115 | * We cannot pre-allocate enough stripe_heads as we may need | |
4116 | * more than exist in the cache (if we allow ever large chunks). | |
4117 | * So we do one stripe head at a time and record in | |
4118 | * ->bi_hw_segments how many have been done. | |
4119 | * | |
4120 | * We *know* that this entire raid_bio is in one chunk, so | |
4121 | * it will be only one 'dd_idx' and only need one call to raid5_compute_sector. | |
4122 | */ | |
4123 | struct stripe_head *sh; | |
911d4ee8 | 4124 | int dd_idx; |
46031f9a RBJ |
4125 | sector_t sector, logical_sector, last_sector; |
4126 | int scnt = 0; | |
4127 | int remaining; | |
4128 | int handled = 0; | |
4129 | ||
4130 | logical_sector = raid_bio->bi_sector & ~((sector_t)STRIPE_SECTORS-1); | |
112bf897 | 4131 | sector = raid5_compute_sector(conf, logical_sector, |
911d4ee8 | 4132 | 0, &dd_idx, NULL); |
46031f9a RBJ |
4133 | last_sector = raid_bio->bi_sector + (raid_bio->bi_size>>9); |
4134 | ||
4135 | for (; logical_sector < last_sector; | |
387bb173 NB |
4136 | logical_sector += STRIPE_SECTORS, |
4137 | sector += STRIPE_SECTORS, | |
4138 | scnt++) { | |
46031f9a | 4139 | |
960e739d | 4140 | if (scnt < raid5_bi_hw_segments(raid_bio)) |
46031f9a RBJ |
4141 | /* already done this stripe */ |
4142 | continue; | |
4143 | ||
b5663ba4 | 4144 | sh = get_active_stripe(conf, sector, 0, 1); |
46031f9a RBJ |
4145 | |
4146 | if (!sh) { | |
4147 | /* failed to get a stripe - must wait */ | |
960e739d | 4148 | raid5_set_bi_hw_segments(raid_bio, scnt); |
46031f9a RBJ |
4149 | conf->retry_read_aligned = raid_bio; |
4150 | return handled; | |
4151 | } | |
4152 | ||
4153 | set_bit(R5_ReadError, &sh->dev[dd_idx].flags); | |
387bb173 NB |
4154 | if (!add_stripe_bio(sh, raid_bio, dd_idx, 0)) { |
4155 | release_stripe(sh); | |
960e739d | 4156 | raid5_set_bi_hw_segments(raid_bio, scnt); |
387bb173 NB |
4157 | conf->retry_read_aligned = raid_bio; |
4158 | return handled; | |
4159 | } | |
4160 | ||
36d1c647 | 4161 | handle_stripe(sh); |
46031f9a RBJ |
4162 | release_stripe(sh); |
4163 | handled++; | |
4164 | } | |
4165 | spin_lock_irq(&conf->device_lock); | |
960e739d | 4166 | remaining = raid5_dec_bi_phys_segments(raid_bio); |
46031f9a | 4167 | spin_unlock_irq(&conf->device_lock); |
0e13fe23 NB |
4168 | if (remaining == 0) |
4169 | bio_endio(raid_bio, 0); | |
46031f9a RBJ |
4170 | if (atomic_dec_and_test(&conf->active_aligned_reads)) |
4171 | wake_up(&conf->wait_for_stripe); | |
4172 | return handled; | |
4173 | } | |
4174 | ||
4175 | ||
4176 | ||
1da177e4 LT |
4177 | /* |
4178 | * This is our raid5 kernel thread. | |
4179 | * | |
4180 | * We scan the hash table for stripes which can be handled now. | |
4181 | * During the scan, completed stripes are saved for us by the interrupt | |
4182 | * handler, so that they will not have to wait for our next wakeup. | |
4183 | */ | |
6ed3003c | 4184 | static void raid5d(mddev_t *mddev) |
1da177e4 LT |
4185 | { |
4186 | struct stripe_head *sh; | |
4187 | raid5_conf_t *conf = mddev_to_conf(mddev); | |
4188 | int handled; | |
4189 | ||
45b4233c | 4190 | pr_debug("+++ raid5d active\n"); |
1da177e4 LT |
4191 | |
4192 | md_check_recovery(mddev); | |
1da177e4 LT |
4193 | |
4194 | handled = 0; | |
4195 | spin_lock_irq(&conf->device_lock); | |
4196 | while (1) { | |
46031f9a | 4197 | struct bio *bio; |
1da177e4 | 4198 | |
ae3c20cc | 4199 | if (conf->seq_flush != conf->seq_write) { |
72626685 | 4200 | int seq = conf->seq_flush; |
700e432d | 4201 | spin_unlock_irq(&conf->device_lock); |
72626685 | 4202 | bitmap_unplug(mddev->bitmap); |
700e432d | 4203 | spin_lock_irq(&conf->device_lock); |
72626685 N |
4204 | conf->seq_write = seq; |
4205 | activate_bit_delay(conf); | |
4206 | } | |
4207 | ||
46031f9a RBJ |
4208 | while ((bio = remove_bio_from_retry(conf))) { |
4209 | int ok; | |
4210 | spin_unlock_irq(&conf->device_lock); | |
4211 | ok = retry_aligned_read(conf, bio); | |
4212 | spin_lock_irq(&conf->device_lock); | |
4213 | if (!ok) | |
4214 | break; | |
4215 | handled++; | |
4216 | } | |
4217 | ||
8b3e6cdc DW |
4218 | sh = __get_priority_stripe(conf); |
4219 | ||
c9f21aaf | 4220 | if (!sh) |
1da177e4 | 4221 | break; |
1da177e4 LT |
4222 | spin_unlock_irq(&conf->device_lock); |
4223 | ||
4224 | handled++; | |
36d1c647 | 4225 | handle_stripe(sh); |
1da177e4 LT |
4226 | release_stripe(sh); |
4227 | ||
4228 | spin_lock_irq(&conf->device_lock); | |
4229 | } | |
45b4233c | 4230 | pr_debug("%d stripes handled\n", handled); |
1da177e4 LT |
4231 | |
4232 | spin_unlock_irq(&conf->device_lock); | |
4233 | ||
c9f21aaf | 4234 | async_tx_issue_pending_all(); |
1da177e4 LT |
4235 | unplug_slaves(mddev); |
4236 | ||
45b4233c | 4237 | pr_debug("--- raid5d inactive\n"); |
1da177e4 LT |
4238 | } |
4239 | ||
3f294f4f | 4240 | static ssize_t |
007583c9 | 4241 | raid5_show_stripe_cache_size(mddev_t *mddev, char *page) |
3f294f4f | 4242 | { |
007583c9 | 4243 | raid5_conf_t *conf = mddev_to_conf(mddev); |
96de1e66 N |
4244 | if (conf) |
4245 | return sprintf(page, "%d\n", conf->max_nr_stripes); | |
4246 | else | |
4247 | return 0; | |
3f294f4f N |
4248 | } |
4249 | ||
4250 | static ssize_t | |
007583c9 | 4251 | raid5_store_stripe_cache_size(mddev_t *mddev, const char *page, size_t len) |
3f294f4f | 4252 | { |
007583c9 | 4253 | raid5_conf_t *conf = mddev_to_conf(mddev); |
4ef197d8 | 4254 | unsigned long new; |
b5470dc5 DW |
4255 | int err; |
4256 | ||
3f294f4f N |
4257 | if (len >= PAGE_SIZE) |
4258 | return -EINVAL; | |
96de1e66 N |
4259 | if (!conf) |
4260 | return -ENODEV; | |
3f294f4f | 4261 | |
4ef197d8 | 4262 | if (strict_strtoul(page, 10, &new)) |
3f294f4f N |
4263 | return -EINVAL; |
4264 | if (new <= 16 || new > 32768) | |
4265 | return -EINVAL; | |
4266 | while (new < conf->max_nr_stripes) { | |
4267 | if (drop_one_stripe(conf)) | |
4268 | conf->max_nr_stripes--; | |
4269 | else | |
4270 | break; | |
4271 | } | |
b5470dc5 DW |
4272 | err = md_allow_write(mddev); |
4273 | if (err) | |
4274 | return err; | |
3f294f4f N |
4275 | while (new > conf->max_nr_stripes) { |
4276 | if (grow_one_stripe(conf)) | |
4277 | conf->max_nr_stripes++; | |
4278 | else break; | |
4279 | } | |
4280 | return len; | |
4281 | } | |
007583c9 | 4282 | |
96de1e66 N |
4283 | static struct md_sysfs_entry |
4284 | raid5_stripecache_size = __ATTR(stripe_cache_size, S_IRUGO | S_IWUSR, | |
4285 | raid5_show_stripe_cache_size, | |
4286 | raid5_store_stripe_cache_size); | |
3f294f4f | 4287 | |
8b3e6cdc DW |
4288 | static ssize_t |
4289 | raid5_show_preread_threshold(mddev_t *mddev, char *page) | |
4290 | { | |
4291 | raid5_conf_t *conf = mddev_to_conf(mddev); | |
4292 | if (conf) | |
4293 | return sprintf(page, "%d\n", conf->bypass_threshold); | |
4294 | else | |
4295 | return 0; | |
4296 | } | |
4297 | ||
4298 | static ssize_t | |
4299 | raid5_store_preread_threshold(mddev_t *mddev, const char *page, size_t len) | |
4300 | { | |
4301 | raid5_conf_t *conf = mddev_to_conf(mddev); | |
4ef197d8 | 4302 | unsigned long new; |
8b3e6cdc DW |
4303 | if (len >= PAGE_SIZE) |
4304 | return -EINVAL; | |
4305 | if (!conf) | |
4306 | return -ENODEV; | |
4307 | ||
4ef197d8 | 4308 | if (strict_strtoul(page, 10, &new)) |
8b3e6cdc | 4309 | return -EINVAL; |
4ef197d8 | 4310 | if (new > conf->max_nr_stripes) |
8b3e6cdc DW |
4311 | return -EINVAL; |
4312 | conf->bypass_threshold = new; | |
4313 | return len; | |
4314 | } | |
4315 | ||
4316 | static struct md_sysfs_entry | |
4317 | raid5_preread_bypass_threshold = __ATTR(preread_bypass_threshold, | |
4318 | S_IRUGO | S_IWUSR, | |
4319 | raid5_show_preread_threshold, | |
4320 | raid5_store_preread_threshold); | |
4321 | ||
3f294f4f | 4322 | static ssize_t |
96de1e66 | 4323 | stripe_cache_active_show(mddev_t *mddev, char *page) |
3f294f4f | 4324 | { |
007583c9 | 4325 | raid5_conf_t *conf = mddev_to_conf(mddev); |
96de1e66 N |
4326 | if (conf) |
4327 | return sprintf(page, "%d\n", atomic_read(&conf->active_stripes)); | |
4328 | else | |
4329 | return 0; | |
3f294f4f N |
4330 | } |
4331 | ||
96de1e66 N |
4332 | static struct md_sysfs_entry |
4333 | raid5_stripecache_active = __ATTR_RO(stripe_cache_active); | |
3f294f4f | 4334 | |
007583c9 | 4335 | static struct attribute *raid5_attrs[] = { |
3f294f4f N |
4336 | &raid5_stripecache_size.attr, |
4337 | &raid5_stripecache_active.attr, | |
8b3e6cdc | 4338 | &raid5_preread_bypass_threshold.attr, |
3f294f4f N |
4339 | NULL, |
4340 | }; | |
007583c9 N |
4341 | static struct attribute_group raid5_attrs_group = { |
4342 | .name = NULL, | |
4343 | .attrs = raid5_attrs, | |
3f294f4f N |
4344 | }; |
4345 | ||
80c3a6ce DW |
4346 | static sector_t |
4347 | raid5_size(mddev_t *mddev, sector_t sectors, int raid_disks) | |
4348 | { | |
4349 | raid5_conf_t *conf = mddev_to_conf(mddev); | |
4350 | ||
4351 | if (!sectors) | |
4352 | sectors = mddev->dev_sectors; | |
7ec05478 N |
4353 | if (!raid_disks) { |
4354 | /* size is defined by the smallest of previous and new size */ | |
4355 | if (conf->raid_disks < conf->previous_raid_disks) | |
4356 | raid_disks = conf->raid_disks; | |
4357 | else | |
4358 | raid_disks = conf->previous_raid_disks; | |
4359 | } | |
80c3a6ce DW |
4360 | |
4361 | sectors &= ~((sector_t)mddev->chunk_size/512 - 1); | |
784052ec | 4362 | sectors &= ~((sector_t)mddev->new_chunk/512 - 1); |
80c3a6ce DW |
4363 | return sectors * (raid_disks - conf->max_degraded); |
4364 | } | |
4365 | ||
36d1c647 DW |
4366 | static void raid5_free_percpu(raid5_conf_t *conf) |
4367 | { | |
4368 | struct raid5_percpu *percpu; | |
4369 | unsigned long cpu; | |
4370 | ||
4371 | if (!conf->percpu) | |
4372 | return; | |
4373 | ||
4374 | get_online_cpus(); | |
4375 | for_each_possible_cpu(cpu) { | |
4376 | percpu = per_cpu_ptr(conf->percpu, cpu); | |
4377 | safe_put_page(percpu->spare_page); | |
d6f38f31 | 4378 | kfree(percpu->scribble); |
36d1c647 DW |
4379 | } |
4380 | #ifdef CONFIG_HOTPLUG_CPU | |
4381 | unregister_cpu_notifier(&conf->cpu_notify); | |
4382 | #endif | |
4383 | put_online_cpus(); | |
4384 | ||
4385 | free_percpu(conf->percpu); | |
4386 | } | |
4387 | ||
a11034b4 DW |
4388 | static void free_conf(raid5_conf_t *conf) |
4389 | { | |
4390 | shrink_stripes(conf); | |
36d1c647 | 4391 | raid5_free_percpu(conf); |
a11034b4 DW |
4392 | kfree(conf->disks); |
4393 | kfree(conf->stripe_hashtbl); | |
4394 | kfree(conf); | |
4395 | } | |
4396 | ||
36d1c647 DW |
4397 | #ifdef CONFIG_HOTPLUG_CPU |
4398 | static int raid456_cpu_notify(struct notifier_block *nfb, unsigned long action, | |
4399 | void *hcpu) | |
4400 | { | |
4401 | raid5_conf_t *conf = container_of(nfb, raid5_conf_t, cpu_notify); | |
4402 | long cpu = (long)hcpu; | |
4403 | struct raid5_percpu *percpu = per_cpu_ptr(conf->percpu, cpu); | |
4404 | ||
4405 | switch (action) { | |
4406 | case CPU_UP_PREPARE: | |
4407 | case CPU_UP_PREPARE_FROZEN: | |
d6f38f31 | 4408 | if (conf->level == 6 && !percpu->spare_page) |
36d1c647 | 4409 | percpu->spare_page = alloc_page(GFP_KERNEL); |
d6f38f31 DW |
4410 | if (!percpu->scribble) |
4411 | percpu->scribble = kmalloc(conf->scribble_len, GFP_KERNEL); | |
4412 | ||
4413 | if (!percpu->scribble || | |
4414 | (conf->level == 6 && !percpu->spare_page)) { | |
4415 | safe_put_page(percpu->spare_page); | |
4416 | kfree(percpu->scribble); | |
36d1c647 DW |
4417 | pr_err("%s: failed memory allocation for cpu%ld\n", |
4418 | __func__, cpu); | |
4419 | return NOTIFY_BAD; | |
4420 | } | |
4421 | break; | |
4422 | case CPU_DEAD: | |
4423 | case CPU_DEAD_FROZEN: | |
4424 | safe_put_page(percpu->spare_page); | |
d6f38f31 | 4425 | kfree(percpu->scribble); |
36d1c647 | 4426 | percpu->spare_page = NULL; |
d6f38f31 | 4427 | percpu->scribble = NULL; |
36d1c647 DW |
4428 | break; |
4429 | default: | |
4430 | break; | |
4431 | } | |
4432 | return NOTIFY_OK; | |
4433 | } | |
4434 | #endif | |
4435 | ||
4436 | static int raid5_alloc_percpu(raid5_conf_t *conf) | |
4437 | { | |
4438 | unsigned long cpu; | |
4439 | struct page *spare_page; | |
4440 | struct raid5_percpu *allcpus; | |
d6f38f31 | 4441 | void *scribble; |
36d1c647 DW |
4442 | int err; |
4443 | ||
36d1c647 DW |
4444 | allcpus = alloc_percpu(struct raid5_percpu); |
4445 | if (!allcpus) | |
4446 | return -ENOMEM; | |
4447 | conf->percpu = allcpus; | |
4448 | ||
4449 | get_online_cpus(); | |
4450 | err = 0; | |
4451 | for_each_present_cpu(cpu) { | |
d6f38f31 DW |
4452 | if (conf->level == 6) { |
4453 | spare_page = alloc_page(GFP_KERNEL); | |
4454 | if (!spare_page) { | |
4455 | err = -ENOMEM; | |
4456 | break; | |
4457 | } | |
4458 | per_cpu_ptr(conf->percpu, cpu)->spare_page = spare_page; | |
4459 | } | |
4460 | scribble = kmalloc(scribble_len(conf->raid_disks), GFP_KERNEL); | |
4461 | if (!scribble) { | |
36d1c647 DW |
4462 | err = -ENOMEM; |
4463 | break; | |
4464 | } | |
d6f38f31 | 4465 | per_cpu_ptr(conf->percpu, cpu)->scribble = scribble; |
36d1c647 DW |
4466 | } |
4467 | #ifdef CONFIG_HOTPLUG_CPU | |
4468 | conf->cpu_notify.notifier_call = raid456_cpu_notify; | |
4469 | conf->cpu_notify.priority = 0; | |
4470 | if (err == 0) | |
4471 | err = register_cpu_notifier(&conf->cpu_notify); | |
4472 | #endif | |
4473 | put_online_cpus(); | |
4474 | ||
4475 | return err; | |
4476 | } | |
4477 | ||
91adb564 | 4478 | static raid5_conf_t *setup_conf(mddev_t *mddev) |
1da177e4 LT |
4479 | { |
4480 | raid5_conf_t *conf; | |
4481 | int raid_disk, memory; | |
4482 | mdk_rdev_t *rdev; | |
4483 | struct disk_info *disk; | |
1da177e4 | 4484 | |
91adb564 N |
4485 | if (mddev->new_level != 5 |
4486 | && mddev->new_level != 4 | |
4487 | && mddev->new_level != 6) { | |
16a53ecc | 4488 | printk(KERN_ERR "raid5: %s: raid level not set to 4/5/6 (%d)\n", |
91adb564 N |
4489 | mdname(mddev), mddev->new_level); |
4490 | return ERR_PTR(-EIO); | |
1da177e4 | 4491 | } |
91adb564 N |
4492 | if ((mddev->new_level == 5 |
4493 | && !algorithm_valid_raid5(mddev->new_layout)) || | |
4494 | (mddev->new_level == 6 | |
4495 | && !algorithm_valid_raid6(mddev->new_layout))) { | |
99c0fb5f | 4496 | printk(KERN_ERR "raid5: %s: layout %d not supported\n", |
91adb564 N |
4497 | mdname(mddev), mddev->new_layout); |
4498 | return ERR_PTR(-EIO); | |
99c0fb5f | 4499 | } |
91adb564 N |
4500 | if (mddev->new_level == 6 && mddev->raid_disks < 4) { |
4501 | printk(KERN_ERR "raid6: not enough configured devices for %s (%d, minimum 4)\n", | |
4502 | mdname(mddev), mddev->raid_disks); | |
4503 | return ERR_PTR(-EINVAL); | |
4bbf3771 N |
4504 | } |
4505 | ||
91adb564 N |
4506 | if (!mddev->new_chunk || mddev->new_chunk % PAGE_SIZE) { |
4507 | printk(KERN_ERR "raid5: invalid chunk size %d for %s\n", | |
4508 | mddev->new_chunk, mdname(mddev)); | |
4509 | return ERR_PTR(-EINVAL); | |
f6705578 N |
4510 | } |
4511 | ||
91adb564 N |
4512 | conf = kzalloc(sizeof(raid5_conf_t), GFP_KERNEL); |
4513 | if (conf == NULL) | |
1da177e4 | 4514 | goto abort; |
91adb564 N |
4515 | |
4516 | conf->raid_disks = mddev->raid_disks; | |
d6f38f31 | 4517 | conf->scribble_len = scribble_len(conf->raid_disks); |
91adb564 N |
4518 | if (mddev->reshape_position == MaxSector) |
4519 | conf->previous_raid_disks = mddev->raid_disks; | |
4520 | else | |
f6705578 | 4521 | conf->previous_raid_disks = mddev->raid_disks - mddev->delta_disks; |
f6705578 N |
4522 | |
4523 | conf->disks = kzalloc(conf->raid_disks * sizeof(struct disk_info), | |
b55e6bfc N |
4524 | GFP_KERNEL); |
4525 | if (!conf->disks) | |
4526 | goto abort; | |
9ffae0cf | 4527 | |
1da177e4 LT |
4528 | conf->mddev = mddev; |
4529 | ||
fccddba0 | 4530 | if ((conf->stripe_hashtbl = kzalloc(PAGE_SIZE, GFP_KERNEL)) == NULL) |
1da177e4 | 4531 | goto abort; |
1da177e4 | 4532 | |
36d1c647 DW |
4533 | conf->level = mddev->new_level; |
4534 | if (raid5_alloc_percpu(conf) != 0) | |
4535 | goto abort; | |
4536 | ||
1da177e4 LT |
4537 | spin_lock_init(&conf->device_lock); |
4538 | init_waitqueue_head(&conf->wait_for_stripe); | |
4539 | init_waitqueue_head(&conf->wait_for_overlap); | |
4540 | INIT_LIST_HEAD(&conf->handle_list); | |
8b3e6cdc | 4541 | INIT_LIST_HEAD(&conf->hold_list); |
1da177e4 | 4542 | INIT_LIST_HEAD(&conf->delayed_list); |
72626685 | 4543 | INIT_LIST_HEAD(&conf->bitmap_list); |
1da177e4 LT |
4544 | INIT_LIST_HEAD(&conf->inactive_list); |
4545 | atomic_set(&conf->active_stripes, 0); | |
4546 | atomic_set(&conf->preread_active_stripes, 0); | |
46031f9a | 4547 | atomic_set(&conf->active_aligned_reads, 0); |
8b3e6cdc | 4548 | conf->bypass_threshold = BYPASS_THRESHOLD; |
1da177e4 | 4549 | |
45b4233c | 4550 | pr_debug("raid5: run(%s) called.\n", mdname(mddev)); |
1da177e4 | 4551 | |
159ec1fc | 4552 | list_for_each_entry(rdev, &mddev->disks, same_set) { |
1da177e4 | 4553 | raid_disk = rdev->raid_disk; |
f6705578 | 4554 | if (raid_disk >= conf->raid_disks |
1da177e4 LT |
4555 | || raid_disk < 0) |
4556 | continue; | |
4557 | disk = conf->disks + raid_disk; | |
4558 | ||
4559 | disk->rdev = rdev; | |
4560 | ||
b2d444d7 | 4561 | if (test_bit(In_sync, &rdev->flags)) { |
1da177e4 LT |
4562 | char b[BDEVNAME_SIZE]; |
4563 | printk(KERN_INFO "raid5: device %s operational as raid" | |
4564 | " disk %d\n", bdevname(rdev->bdev,b), | |
4565 | raid_disk); | |
8c2e870a NB |
4566 | } else |
4567 | /* Cannot rely on bitmap to complete recovery */ | |
4568 | conf->fullsync = 1; | |
1da177e4 LT |
4569 | } |
4570 | ||
91adb564 | 4571 | conf->chunk_size = mddev->new_chunk; |
16a53ecc N |
4572 | if (conf->level == 6) |
4573 | conf->max_degraded = 2; | |
4574 | else | |
4575 | conf->max_degraded = 1; | |
91adb564 | 4576 | conf->algorithm = mddev->new_layout; |
1da177e4 | 4577 | conf->max_nr_stripes = NR_STRIPES; |
fef9c61f | 4578 | conf->reshape_progress = mddev->reshape_position; |
e183eaed | 4579 | if (conf->reshape_progress != MaxSector) { |
784052ec | 4580 | conf->prev_chunk = mddev->chunk_size; |
e183eaed N |
4581 | conf->prev_algo = mddev->layout; |
4582 | } | |
1da177e4 | 4583 | |
91adb564 N |
4584 | memory = conf->max_nr_stripes * (sizeof(struct stripe_head) + |
4585 | conf->raid_disks * ((sizeof(struct bio) + PAGE_SIZE))) / 1024; | |
4586 | if (grow_stripes(conf, conf->max_nr_stripes)) { | |
4587 | printk(KERN_ERR | |
4588 | "raid5: couldn't allocate %dkB for buffers\n", memory); | |
4589 | goto abort; | |
4590 | } else | |
4591 | printk(KERN_INFO "raid5: allocated %dkB for %s\n", | |
4592 | memory, mdname(mddev)); | |
1da177e4 | 4593 | |
91adb564 N |
4594 | conf->thread = md_register_thread(raid5d, mddev, "%s_raid5"); |
4595 | if (!conf->thread) { | |
4596 | printk(KERN_ERR | |
4597 | "raid5: couldn't allocate thread for %s\n", | |
4598 | mdname(mddev)); | |
16a53ecc N |
4599 | goto abort; |
4600 | } | |
91adb564 N |
4601 | |
4602 | return conf; | |
4603 | ||
4604 | abort: | |
4605 | if (conf) { | |
a11034b4 | 4606 | free_conf(conf); |
91adb564 N |
4607 | return ERR_PTR(-EIO); |
4608 | } else | |
4609 | return ERR_PTR(-ENOMEM); | |
4610 | } | |
4611 | ||
4612 | static int run(mddev_t *mddev) | |
4613 | { | |
4614 | raid5_conf_t *conf; | |
4615 | int working_disks = 0; | |
4616 | mdk_rdev_t *rdev; | |
4617 | ||
4618 | if (mddev->reshape_position != MaxSector) { | |
4619 | /* Check that we can continue the reshape. | |
4620 | * Currently only disks can change, it must | |
4621 | * increase, and we must be past the point where | |
4622 | * a stripe over-writes itself | |
4623 | */ | |
4624 | sector_t here_new, here_old; | |
4625 | int old_disks; | |
18b00334 | 4626 | int max_degraded = (mddev->level == 6 ? 2 : 1); |
91adb564 | 4627 | |
88ce4930 | 4628 | if (mddev->new_level != mddev->level) { |
91adb564 N |
4629 | printk(KERN_ERR "raid5: %s: unsupported reshape " |
4630 | "required - aborting.\n", | |
4631 | mdname(mddev)); | |
4632 | return -EINVAL; | |
4633 | } | |
91adb564 N |
4634 | old_disks = mddev->raid_disks - mddev->delta_disks; |
4635 | /* reshape_position must be on a new-stripe boundary, and one | |
4636 | * further up in new geometry must map after here in old | |
4637 | * geometry. | |
4638 | */ | |
4639 | here_new = mddev->reshape_position; | |
784052ec | 4640 | if (sector_div(here_new, (mddev->new_chunk>>9)* |
91adb564 N |
4641 | (mddev->raid_disks - max_degraded))) { |
4642 | printk(KERN_ERR "raid5: reshape_position not " | |
4643 | "on a stripe boundary\n"); | |
4644 | return -EINVAL; | |
4645 | } | |
4646 | /* here_new is the stripe we will write to */ | |
4647 | here_old = mddev->reshape_position; | |
4648 | sector_div(here_old, (mddev->chunk_size>>9)* | |
4649 | (old_disks-max_degraded)); | |
4650 | /* here_old is the first stripe that we might need to read | |
4651 | * from */ | |
4652 | if (here_new >= here_old) { | |
4653 | /* Reading from the same stripe as writing to - bad */ | |
4654 | printk(KERN_ERR "raid5: reshape_position too early for " | |
4655 | "auto-recovery - aborting.\n"); | |
4656 | return -EINVAL; | |
4657 | } | |
4658 | printk(KERN_INFO "raid5: reshape will continue\n"); | |
4659 | /* OK, we should be able to continue; */ | |
4660 | } else { | |
4661 | BUG_ON(mddev->level != mddev->new_level); | |
4662 | BUG_ON(mddev->layout != mddev->new_layout); | |
4663 | BUG_ON(mddev->chunk_size != mddev->new_chunk); | |
4664 | BUG_ON(mddev->delta_disks != 0); | |
1da177e4 | 4665 | } |
91adb564 | 4666 | |
245f46c2 N |
4667 | if (mddev->private == NULL) |
4668 | conf = setup_conf(mddev); | |
4669 | else | |
4670 | conf = mddev->private; | |
4671 | ||
91adb564 N |
4672 | if (IS_ERR(conf)) |
4673 | return PTR_ERR(conf); | |
4674 | ||
4675 | mddev->thread = conf->thread; | |
4676 | conf->thread = NULL; | |
4677 | mddev->private = conf; | |
4678 | ||
4679 | /* | |
4680 | * 0 for a fully functional array, 1 or 2 for a degraded array. | |
4681 | */ | |
4682 | list_for_each_entry(rdev, &mddev->disks, same_set) | |
4683 | if (rdev->raid_disk >= 0 && | |
4684 | test_bit(In_sync, &rdev->flags)) | |
4685 | working_disks++; | |
4686 | ||
4687 | mddev->degraded = conf->raid_disks - working_disks; | |
4688 | ||
16a53ecc | 4689 | if (mddev->degraded > conf->max_degraded) { |
1da177e4 LT |
4690 | printk(KERN_ERR "raid5: not enough operational devices for %s" |
4691 | " (%d/%d failed)\n", | |
02c2de8c | 4692 | mdname(mddev), mddev->degraded, conf->raid_disks); |
1da177e4 LT |
4693 | goto abort; |
4694 | } | |
4695 | ||
91adb564 N |
4696 | /* device size must be a multiple of chunk size */ |
4697 | mddev->dev_sectors &= ~(mddev->chunk_size / 512 - 1); | |
4698 | mddev->resync_max_sectors = mddev->dev_sectors; | |
4699 | ||
16a53ecc | 4700 | if (mddev->degraded > 0 && |
1da177e4 | 4701 | mddev->recovery_cp != MaxSector) { |
6ff8d8ec N |
4702 | if (mddev->ok_start_degraded) |
4703 | printk(KERN_WARNING | |
4704 | "raid5: starting dirty degraded array: %s" | |
4705 | "- data corruption possible.\n", | |
4706 | mdname(mddev)); | |
4707 | else { | |
4708 | printk(KERN_ERR | |
4709 | "raid5: cannot start dirty degraded array for %s\n", | |
4710 | mdname(mddev)); | |
4711 | goto abort; | |
4712 | } | |
1da177e4 LT |
4713 | } |
4714 | ||
1da177e4 LT |
4715 | if (mddev->degraded == 0) |
4716 | printk("raid5: raid level %d set %s active with %d out of %d" | |
e183eaed N |
4717 | " devices, algorithm %d\n", conf->level, mdname(mddev), |
4718 | mddev->raid_disks-mddev->degraded, mddev->raid_disks, | |
4719 | mddev->new_layout); | |
1da177e4 LT |
4720 | else |
4721 | printk(KERN_ALERT "raid5: raid level %d set %s active with %d" | |
4722 | " out of %d devices, algorithm %d\n", conf->level, | |
4723 | mdname(mddev), mddev->raid_disks - mddev->degraded, | |
e183eaed | 4724 | mddev->raid_disks, mddev->new_layout); |
1da177e4 LT |
4725 | |
4726 | print_raid5_conf(conf); | |
4727 | ||
fef9c61f | 4728 | if (conf->reshape_progress != MaxSector) { |
f6705578 | 4729 | printk("...ok start reshape thread\n"); |
fef9c61f | 4730 | conf->reshape_safe = conf->reshape_progress; |
f6705578 N |
4731 | atomic_set(&conf->reshape_stripes, 0); |
4732 | clear_bit(MD_RECOVERY_SYNC, &mddev->recovery); | |
4733 | clear_bit(MD_RECOVERY_CHECK, &mddev->recovery); | |
4734 | set_bit(MD_RECOVERY_RESHAPE, &mddev->recovery); | |
4735 | set_bit(MD_RECOVERY_RUNNING, &mddev->recovery); | |
4736 | mddev->sync_thread = md_register_thread(md_do_sync, mddev, | |
4737 | "%s_reshape"); | |
f6705578 N |
4738 | } |
4739 | ||
1da177e4 | 4740 | /* read-ahead size must cover two whole stripes, which is |
16a53ecc | 4741 | * 2 * (datadisks) * chunksize where 'n' is the number of raid devices |
1da177e4 LT |
4742 | */ |
4743 | { | |
16a53ecc N |
4744 | int data_disks = conf->previous_raid_disks - conf->max_degraded; |
4745 | int stripe = data_disks * | |
8932c2e0 | 4746 | (mddev->chunk_size / PAGE_SIZE); |
1da177e4 LT |
4747 | if (mddev->queue->backing_dev_info.ra_pages < 2 * stripe) |
4748 | mddev->queue->backing_dev_info.ra_pages = 2 * stripe; | |
4749 | } | |
4750 | ||
4751 | /* Ok, everything is just fine now */ | |
5e55e2f5 N |
4752 | if (sysfs_create_group(&mddev->kobj, &raid5_attrs_group)) |
4753 | printk(KERN_WARNING | |
4754 | "raid5: failed to create sysfs attributes for %s\n", | |
4755 | mdname(mddev)); | |
7a5febe9 | 4756 | |
91adb564 N |
4757 | mddev->queue->queue_lock = &conf->device_lock; |
4758 | ||
7a5febe9 | 4759 | mddev->queue->unplug_fn = raid5_unplug_device; |
f022b2fd | 4760 | mddev->queue->backing_dev_info.congested_data = mddev; |
041ae52e | 4761 | mddev->queue->backing_dev_info.congested_fn = raid5_congested; |
f022b2fd | 4762 | |
1f403624 | 4763 | md_set_array_sectors(mddev, raid5_size(mddev, 0, 0)); |
7a5febe9 | 4764 | |
23032a0e RBJ |
4765 | blk_queue_merge_bvec(mddev->queue, raid5_mergeable_bvec); |
4766 | ||
1da177e4 LT |
4767 | return 0; |
4768 | abort: | |
e0cf8f04 | 4769 | md_unregister_thread(mddev->thread); |
91adb564 | 4770 | mddev->thread = NULL; |
1da177e4 LT |
4771 | if (conf) { |
4772 | print_raid5_conf(conf); | |
a11034b4 | 4773 | free_conf(conf); |
1da177e4 LT |
4774 | } |
4775 | mddev->private = NULL; | |
4776 | printk(KERN_ALERT "raid5: failed to run raid set %s\n", mdname(mddev)); | |
4777 | return -EIO; | |
4778 | } | |
4779 | ||
4780 | ||
4781 | ||
3f294f4f | 4782 | static int stop(mddev_t *mddev) |
1da177e4 LT |
4783 | { |
4784 | raid5_conf_t *conf = (raid5_conf_t *) mddev->private; | |
4785 | ||
4786 | md_unregister_thread(mddev->thread); | |
4787 | mddev->thread = NULL; | |
041ae52e | 4788 | mddev->queue->backing_dev_info.congested_fn = NULL; |
1da177e4 | 4789 | blk_sync_queue(mddev->queue); /* the unplug fn references 'conf'*/ |
007583c9 | 4790 | sysfs_remove_group(&mddev->kobj, &raid5_attrs_group); |
a11034b4 | 4791 | free_conf(conf); |
1da177e4 LT |
4792 | mddev->private = NULL; |
4793 | return 0; | |
4794 | } | |
4795 | ||
45b4233c | 4796 | #ifdef DEBUG |
d710e138 | 4797 | static void print_sh(struct seq_file *seq, struct stripe_head *sh) |
1da177e4 LT |
4798 | { |
4799 | int i; | |
4800 | ||
16a53ecc N |
4801 | seq_printf(seq, "sh %llu, pd_idx %d, state %ld.\n", |
4802 | (unsigned long long)sh->sector, sh->pd_idx, sh->state); | |
4803 | seq_printf(seq, "sh %llu, count %d.\n", | |
4804 | (unsigned long long)sh->sector, atomic_read(&sh->count)); | |
4805 | seq_printf(seq, "sh %llu, ", (unsigned long long)sh->sector); | |
7ecaa1e6 | 4806 | for (i = 0; i < sh->disks; i++) { |
16a53ecc N |
4807 | seq_printf(seq, "(cache%d: %p %ld) ", |
4808 | i, sh->dev[i].page, sh->dev[i].flags); | |
1da177e4 | 4809 | } |
16a53ecc | 4810 | seq_printf(seq, "\n"); |
1da177e4 LT |
4811 | } |
4812 | ||
d710e138 | 4813 | static void printall(struct seq_file *seq, raid5_conf_t *conf) |
1da177e4 LT |
4814 | { |
4815 | struct stripe_head *sh; | |
fccddba0 | 4816 | struct hlist_node *hn; |
1da177e4 LT |
4817 | int i; |
4818 | ||
4819 | spin_lock_irq(&conf->device_lock); | |
4820 | for (i = 0; i < NR_HASH; i++) { | |
fccddba0 | 4821 | hlist_for_each_entry(sh, hn, &conf->stripe_hashtbl[i], hash) { |
1da177e4 LT |
4822 | if (sh->raid_conf != conf) |
4823 | continue; | |
16a53ecc | 4824 | print_sh(seq, sh); |
1da177e4 LT |
4825 | } |
4826 | } | |
4827 | spin_unlock_irq(&conf->device_lock); | |
4828 | } | |
4829 | #endif | |
4830 | ||
d710e138 | 4831 | static void status(struct seq_file *seq, mddev_t *mddev) |
1da177e4 LT |
4832 | { |
4833 | raid5_conf_t *conf = (raid5_conf_t *) mddev->private; | |
4834 | int i; | |
4835 | ||
4836 | seq_printf (seq, " level %d, %dk chunk, algorithm %d", mddev->level, mddev->chunk_size >> 10, mddev->layout); | |
02c2de8c | 4837 | seq_printf (seq, " [%d/%d] [", conf->raid_disks, conf->raid_disks - mddev->degraded); |
1da177e4 LT |
4838 | for (i = 0; i < conf->raid_disks; i++) |
4839 | seq_printf (seq, "%s", | |
4840 | conf->disks[i].rdev && | |
b2d444d7 | 4841 | test_bit(In_sync, &conf->disks[i].rdev->flags) ? "U" : "_"); |
1da177e4 | 4842 | seq_printf (seq, "]"); |
45b4233c | 4843 | #ifdef DEBUG |
16a53ecc N |
4844 | seq_printf (seq, "\n"); |
4845 | printall(seq, conf); | |
1da177e4 LT |
4846 | #endif |
4847 | } | |
4848 | ||
4849 | static void print_raid5_conf (raid5_conf_t *conf) | |
4850 | { | |
4851 | int i; | |
4852 | struct disk_info *tmp; | |
4853 | ||
4854 | printk("RAID5 conf printout:\n"); | |
4855 | if (!conf) { | |
4856 | printk("(conf==NULL)\n"); | |
4857 | return; | |
4858 | } | |
02c2de8c N |
4859 | printk(" --- rd:%d wd:%d\n", conf->raid_disks, |
4860 | conf->raid_disks - conf->mddev->degraded); | |
1da177e4 LT |
4861 | |
4862 | for (i = 0; i < conf->raid_disks; i++) { | |
4863 | char b[BDEVNAME_SIZE]; | |
4864 | tmp = conf->disks + i; | |
4865 | if (tmp->rdev) | |
4866 | printk(" disk %d, o:%d, dev:%s\n", | |
b2d444d7 | 4867 | i, !test_bit(Faulty, &tmp->rdev->flags), |
1da177e4 LT |
4868 | bdevname(tmp->rdev->bdev,b)); |
4869 | } | |
4870 | } | |
4871 | ||
4872 | static int raid5_spare_active(mddev_t *mddev) | |
4873 | { | |
4874 | int i; | |
4875 | raid5_conf_t *conf = mddev->private; | |
4876 | struct disk_info *tmp; | |
4877 | ||
4878 | for (i = 0; i < conf->raid_disks; i++) { | |
4879 | tmp = conf->disks + i; | |
4880 | if (tmp->rdev | |
b2d444d7 | 4881 | && !test_bit(Faulty, &tmp->rdev->flags) |
c04be0aa N |
4882 | && !test_and_set_bit(In_sync, &tmp->rdev->flags)) { |
4883 | unsigned long flags; | |
4884 | spin_lock_irqsave(&conf->device_lock, flags); | |
1da177e4 | 4885 | mddev->degraded--; |
c04be0aa | 4886 | spin_unlock_irqrestore(&conf->device_lock, flags); |
1da177e4 LT |
4887 | } |
4888 | } | |
4889 | print_raid5_conf(conf); | |
4890 | return 0; | |
4891 | } | |
4892 | ||
4893 | static int raid5_remove_disk(mddev_t *mddev, int number) | |
4894 | { | |
4895 | raid5_conf_t *conf = mddev->private; | |
4896 | int err = 0; | |
4897 | mdk_rdev_t *rdev; | |
4898 | struct disk_info *p = conf->disks + number; | |
4899 | ||
4900 | print_raid5_conf(conf); | |
4901 | rdev = p->rdev; | |
4902 | if (rdev) { | |
ec32a2bd N |
4903 | if (number >= conf->raid_disks && |
4904 | conf->reshape_progress == MaxSector) | |
4905 | clear_bit(In_sync, &rdev->flags); | |
4906 | ||
b2d444d7 | 4907 | if (test_bit(In_sync, &rdev->flags) || |
1da177e4 LT |
4908 | atomic_read(&rdev->nr_pending)) { |
4909 | err = -EBUSY; | |
4910 | goto abort; | |
4911 | } | |
dfc70645 N |
4912 | /* Only remove non-faulty devices if recovery |
4913 | * isn't possible. | |
4914 | */ | |
4915 | if (!test_bit(Faulty, &rdev->flags) && | |
ec32a2bd N |
4916 | mddev->degraded <= conf->max_degraded && |
4917 | number < conf->raid_disks) { | |
dfc70645 N |
4918 | err = -EBUSY; |
4919 | goto abort; | |
4920 | } | |
1da177e4 | 4921 | p->rdev = NULL; |
fbd568a3 | 4922 | synchronize_rcu(); |
1da177e4 LT |
4923 | if (atomic_read(&rdev->nr_pending)) { |
4924 | /* lost the race, try later */ | |
4925 | err = -EBUSY; | |
4926 | p->rdev = rdev; | |
4927 | } | |
4928 | } | |
4929 | abort: | |
4930 | ||
4931 | print_raid5_conf(conf); | |
4932 | return err; | |
4933 | } | |
4934 | ||
4935 | static int raid5_add_disk(mddev_t *mddev, mdk_rdev_t *rdev) | |
4936 | { | |
4937 | raid5_conf_t *conf = mddev->private; | |
199050ea | 4938 | int err = -EEXIST; |
1da177e4 LT |
4939 | int disk; |
4940 | struct disk_info *p; | |
6c2fce2e NB |
4941 | int first = 0; |
4942 | int last = conf->raid_disks - 1; | |
1da177e4 | 4943 | |
16a53ecc | 4944 | if (mddev->degraded > conf->max_degraded) |
1da177e4 | 4945 | /* no point adding a device */ |
199050ea | 4946 | return -EINVAL; |
1da177e4 | 4947 | |
6c2fce2e NB |
4948 | if (rdev->raid_disk >= 0) |
4949 | first = last = rdev->raid_disk; | |
1da177e4 LT |
4950 | |
4951 | /* | |
16a53ecc N |
4952 | * find the disk ... but prefer rdev->saved_raid_disk |
4953 | * if possible. | |
1da177e4 | 4954 | */ |
16a53ecc | 4955 | if (rdev->saved_raid_disk >= 0 && |
6c2fce2e | 4956 | rdev->saved_raid_disk >= first && |
16a53ecc N |
4957 | conf->disks[rdev->saved_raid_disk].rdev == NULL) |
4958 | disk = rdev->saved_raid_disk; | |
4959 | else | |
6c2fce2e NB |
4960 | disk = first; |
4961 | for ( ; disk <= last ; disk++) | |
1da177e4 | 4962 | if ((p=conf->disks + disk)->rdev == NULL) { |
b2d444d7 | 4963 | clear_bit(In_sync, &rdev->flags); |
1da177e4 | 4964 | rdev->raid_disk = disk; |
199050ea | 4965 | err = 0; |
72626685 N |
4966 | if (rdev->saved_raid_disk != disk) |
4967 | conf->fullsync = 1; | |
d6065f7b | 4968 | rcu_assign_pointer(p->rdev, rdev); |
1da177e4 LT |
4969 | break; |
4970 | } | |
4971 | print_raid5_conf(conf); | |
199050ea | 4972 | return err; |
1da177e4 LT |
4973 | } |
4974 | ||
4975 | static int raid5_resize(mddev_t *mddev, sector_t sectors) | |
4976 | { | |
4977 | /* no resync is happening, and there is enough space | |
4978 | * on all devices, so we can resize. | |
4979 | * We need to make sure resync covers any new space. | |
4980 | * If the array is shrinking we should possibly wait until | |
4981 | * any io in the removed space completes, but it hardly seems | |
4982 | * worth it. | |
4983 | */ | |
4984 | sectors &= ~((sector_t)mddev->chunk_size/512 - 1); | |
1f403624 DW |
4985 | md_set_array_sectors(mddev, raid5_size(mddev, sectors, |
4986 | mddev->raid_disks)); | |
b522adcd DW |
4987 | if (mddev->array_sectors > |
4988 | raid5_size(mddev, sectors, mddev->raid_disks)) | |
4989 | return -EINVAL; | |
f233ea5c | 4990 | set_capacity(mddev->gendisk, mddev->array_sectors); |
44ce6294 | 4991 | mddev->changed = 1; |
58c0fed4 AN |
4992 | if (sectors > mddev->dev_sectors && mddev->recovery_cp == MaxSector) { |
4993 | mddev->recovery_cp = mddev->dev_sectors; | |
1da177e4 LT |
4994 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
4995 | } | |
58c0fed4 | 4996 | mddev->dev_sectors = sectors; |
4b5c7ae8 | 4997 | mddev->resync_max_sectors = sectors; |
1da177e4 LT |
4998 | return 0; |
4999 | } | |
5000 | ||
63c70c4f | 5001 | static int raid5_check_reshape(mddev_t *mddev) |
29269553 N |
5002 | { |
5003 | raid5_conf_t *conf = mddev_to_conf(mddev); | |
29269553 | 5004 | |
88ce4930 N |
5005 | if (mddev->delta_disks == 0 && |
5006 | mddev->new_layout == mddev->layout && | |
5007 | mddev->new_chunk == mddev->chunk_size) | |
5008 | return -EINVAL; /* nothing to do */ | |
dba034ee N |
5009 | if (mddev->bitmap) |
5010 | /* Cannot grow a bitmap yet */ | |
5011 | return -EBUSY; | |
ec32a2bd N |
5012 | if (mddev->degraded > conf->max_degraded) |
5013 | return -EINVAL; | |
5014 | if (mddev->delta_disks < 0) { | |
5015 | /* We might be able to shrink, but the devices must | |
5016 | * be made bigger first. | |
5017 | * For raid6, 4 is the minimum size. | |
5018 | * Otherwise 2 is the minimum | |
5019 | */ | |
5020 | int min = 2; | |
5021 | if (mddev->level == 6) | |
5022 | min = 4; | |
5023 | if (mddev->raid_disks + mddev->delta_disks < min) | |
5024 | return -EINVAL; | |
5025 | } | |
29269553 N |
5026 | |
5027 | /* Can only proceed if there are plenty of stripe_heads. | |
5028 | * We need a minimum of one full stripe,, and for sensible progress | |
5029 | * it is best to have about 4 times that. | |
5030 | * If we require 4 times, then the default 256 4K stripe_heads will | |
5031 | * allow for chunk sizes up to 256K, which is probably OK. | |
5032 | * If the chunk size is greater, user-space should request more | |
5033 | * stripe_heads first. | |
5034 | */ | |
63c70c4f N |
5035 | if ((mddev->chunk_size / STRIPE_SIZE) * 4 > conf->max_nr_stripes || |
5036 | (mddev->new_chunk / STRIPE_SIZE) * 4 > conf->max_nr_stripes) { | |
29269553 | 5037 | printk(KERN_WARNING "raid5: reshape: not enough stripes. Needed %lu\n", |
784052ec N |
5038 | (max(mddev->chunk_size, mddev->new_chunk) |
5039 | / STRIPE_SIZE)*4); | |
29269553 N |
5040 | return -ENOSPC; |
5041 | } | |
5042 | ||
ec32a2bd | 5043 | return resize_stripes(conf, conf->raid_disks + mddev->delta_disks); |
63c70c4f N |
5044 | } |
5045 | ||
5046 | static int raid5_start_reshape(mddev_t *mddev) | |
5047 | { | |
5048 | raid5_conf_t *conf = mddev_to_conf(mddev); | |
5049 | mdk_rdev_t *rdev; | |
63c70c4f N |
5050 | int spares = 0; |
5051 | int added_devices = 0; | |
c04be0aa | 5052 | unsigned long flags; |
63c70c4f | 5053 | |
f416885e | 5054 | if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) |
63c70c4f N |
5055 | return -EBUSY; |
5056 | ||
159ec1fc | 5057 | list_for_each_entry(rdev, &mddev->disks, same_set) |
29269553 N |
5058 | if (rdev->raid_disk < 0 && |
5059 | !test_bit(Faulty, &rdev->flags)) | |
5060 | spares++; | |
63c70c4f | 5061 | |
f416885e | 5062 | if (spares - mddev->degraded < mddev->delta_disks - conf->max_degraded) |
29269553 N |
5063 | /* Not enough devices even to make a degraded array |
5064 | * of that size | |
5065 | */ | |
5066 | return -EINVAL; | |
5067 | ||
ec32a2bd N |
5068 | /* Refuse to reduce size of the array. Any reductions in |
5069 | * array size must be through explicit setting of array_size | |
5070 | * attribute. | |
5071 | */ | |
5072 | if (raid5_size(mddev, 0, conf->raid_disks + mddev->delta_disks) | |
5073 | < mddev->array_sectors) { | |
5074 | printk(KERN_ERR "md: %s: array size must be reduced " | |
5075 | "before number of disks\n", mdname(mddev)); | |
5076 | return -EINVAL; | |
5077 | } | |
5078 | ||
f6705578 | 5079 | atomic_set(&conf->reshape_stripes, 0); |
29269553 N |
5080 | spin_lock_irq(&conf->device_lock); |
5081 | conf->previous_raid_disks = conf->raid_disks; | |
63c70c4f | 5082 | conf->raid_disks += mddev->delta_disks; |
88ce4930 N |
5083 | conf->prev_chunk = conf->chunk_size; |
5084 | conf->chunk_size = mddev->new_chunk; | |
5085 | conf->prev_algo = conf->algorithm; | |
5086 | conf->algorithm = mddev->new_layout; | |
fef9c61f N |
5087 | if (mddev->delta_disks < 0) |
5088 | conf->reshape_progress = raid5_size(mddev, 0, 0); | |
5089 | else | |
5090 | conf->reshape_progress = 0; | |
5091 | conf->reshape_safe = conf->reshape_progress; | |
86b42c71 | 5092 | conf->generation++; |
29269553 N |
5093 | spin_unlock_irq(&conf->device_lock); |
5094 | ||
5095 | /* Add some new drives, as many as will fit. | |
5096 | * We know there are enough to make the newly sized array work. | |
5097 | */ | |
159ec1fc | 5098 | list_for_each_entry(rdev, &mddev->disks, same_set) |
29269553 N |
5099 | if (rdev->raid_disk < 0 && |
5100 | !test_bit(Faulty, &rdev->flags)) { | |
199050ea | 5101 | if (raid5_add_disk(mddev, rdev) == 0) { |
29269553 N |
5102 | char nm[20]; |
5103 | set_bit(In_sync, &rdev->flags); | |
29269553 | 5104 | added_devices++; |
5fd6c1dc | 5105 | rdev->recovery_offset = 0; |
29269553 | 5106 | sprintf(nm, "rd%d", rdev->raid_disk); |
5e55e2f5 N |
5107 | if (sysfs_create_link(&mddev->kobj, |
5108 | &rdev->kobj, nm)) | |
5109 | printk(KERN_WARNING | |
5110 | "raid5: failed to create " | |
5111 | " link %s for %s\n", | |
5112 | nm, mdname(mddev)); | |
29269553 N |
5113 | } else |
5114 | break; | |
5115 | } | |
5116 | ||
ec32a2bd N |
5117 | if (mddev->delta_disks > 0) { |
5118 | spin_lock_irqsave(&conf->device_lock, flags); | |
5119 | mddev->degraded = (conf->raid_disks - conf->previous_raid_disks) | |
5120 | - added_devices; | |
5121 | spin_unlock_irqrestore(&conf->device_lock, flags); | |
5122 | } | |
63c70c4f | 5123 | mddev->raid_disks = conf->raid_disks; |
f6705578 | 5124 | mddev->reshape_position = 0; |
850b2b42 | 5125 | set_bit(MD_CHANGE_DEVS, &mddev->flags); |
f6705578 | 5126 | |
29269553 N |
5127 | clear_bit(MD_RECOVERY_SYNC, &mddev->recovery); |
5128 | clear_bit(MD_RECOVERY_CHECK, &mddev->recovery); | |
5129 | set_bit(MD_RECOVERY_RESHAPE, &mddev->recovery); | |
5130 | set_bit(MD_RECOVERY_RUNNING, &mddev->recovery); | |
5131 | mddev->sync_thread = md_register_thread(md_do_sync, mddev, | |
5132 | "%s_reshape"); | |
5133 | if (!mddev->sync_thread) { | |
5134 | mddev->recovery = 0; | |
5135 | spin_lock_irq(&conf->device_lock); | |
5136 | mddev->raid_disks = conf->raid_disks = conf->previous_raid_disks; | |
fef9c61f | 5137 | conf->reshape_progress = MaxSector; |
29269553 N |
5138 | spin_unlock_irq(&conf->device_lock); |
5139 | return -EAGAIN; | |
5140 | } | |
c8f517c4 | 5141 | conf->reshape_checkpoint = jiffies; |
29269553 N |
5142 | md_wakeup_thread(mddev->sync_thread); |
5143 | md_new_event(mddev); | |
5144 | return 0; | |
5145 | } | |
29269553 | 5146 | |
ec32a2bd N |
5147 | /* This is called from the reshape thread and should make any |
5148 | * changes needed in 'conf' | |
5149 | */ | |
29269553 N |
5150 | static void end_reshape(raid5_conf_t *conf) |
5151 | { | |
29269553 | 5152 | |
f6705578 | 5153 | if (!test_bit(MD_RECOVERY_INTR, &conf->mddev->recovery)) { |
f6705578 | 5154 | |
f6705578 | 5155 | spin_lock_irq(&conf->device_lock); |
cea9c228 | 5156 | conf->previous_raid_disks = conf->raid_disks; |
fef9c61f | 5157 | conf->reshape_progress = MaxSector; |
f6705578 | 5158 | spin_unlock_irq(&conf->device_lock); |
b0f9ec04 | 5159 | wake_up(&conf->wait_for_overlap); |
16a53ecc N |
5160 | |
5161 | /* read-ahead size must cover two whole stripes, which is | |
5162 | * 2 * (datadisks) * chunksize where 'n' is the number of raid devices | |
5163 | */ | |
5164 | { | |
cea9c228 N |
5165 | int data_disks = conf->raid_disks - conf->max_degraded; |
5166 | int stripe = data_disks * (conf->chunk_size | |
5167 | / PAGE_SIZE); | |
16a53ecc N |
5168 | if (conf->mddev->queue->backing_dev_info.ra_pages < 2 * stripe) |
5169 | conf->mddev->queue->backing_dev_info.ra_pages = 2 * stripe; | |
5170 | } | |
29269553 | 5171 | } |
29269553 N |
5172 | } |
5173 | ||
ec32a2bd N |
5174 | /* This is called from the raid5d thread with mddev_lock held. |
5175 | * It makes config changes to the device. | |
5176 | */ | |
cea9c228 N |
5177 | static void raid5_finish_reshape(mddev_t *mddev) |
5178 | { | |
5179 | struct block_device *bdev; | |
88ce4930 | 5180 | raid5_conf_t *conf = mddev_to_conf(mddev); |
cea9c228 N |
5181 | |
5182 | if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery)) { | |
5183 | ||
ec32a2bd N |
5184 | if (mddev->delta_disks > 0) { |
5185 | md_set_array_sectors(mddev, raid5_size(mddev, 0, 0)); | |
5186 | set_capacity(mddev->gendisk, mddev->array_sectors); | |
5187 | mddev->changed = 1; | |
5188 | ||
5189 | bdev = bdget_disk(mddev->gendisk, 0); | |
5190 | if (bdev) { | |
5191 | mutex_lock(&bdev->bd_inode->i_mutex); | |
5192 | i_size_write(bdev->bd_inode, | |
5193 | (loff_t)mddev->array_sectors << 9); | |
5194 | mutex_unlock(&bdev->bd_inode->i_mutex); | |
5195 | bdput(bdev); | |
5196 | } | |
5197 | } else { | |
5198 | int d; | |
ec32a2bd N |
5199 | mddev->degraded = conf->raid_disks; |
5200 | for (d = 0; d < conf->raid_disks ; d++) | |
5201 | if (conf->disks[d].rdev && | |
5202 | test_bit(In_sync, | |
5203 | &conf->disks[d].rdev->flags)) | |
5204 | mddev->degraded--; | |
5205 | for (d = conf->raid_disks ; | |
5206 | d < conf->raid_disks - mddev->delta_disks; | |
5207 | d++) | |
5208 | raid5_remove_disk(mddev, d); | |
cea9c228 | 5209 | } |
88ce4930 N |
5210 | mddev->layout = conf->algorithm; |
5211 | mddev->chunk_size = conf->chunk_size; | |
ec32a2bd N |
5212 | mddev->reshape_position = MaxSector; |
5213 | mddev->delta_disks = 0; | |
cea9c228 N |
5214 | } |
5215 | } | |
5216 | ||
72626685 N |
5217 | static void raid5_quiesce(mddev_t *mddev, int state) |
5218 | { | |
5219 | raid5_conf_t *conf = mddev_to_conf(mddev); | |
5220 | ||
5221 | switch(state) { | |
e464eafd N |
5222 | case 2: /* resume for a suspend */ |
5223 | wake_up(&conf->wait_for_overlap); | |
5224 | break; | |
5225 | ||
72626685 N |
5226 | case 1: /* stop all writes */ |
5227 | spin_lock_irq(&conf->device_lock); | |
5228 | conf->quiesce = 1; | |
5229 | wait_event_lock_irq(conf->wait_for_stripe, | |
46031f9a RBJ |
5230 | atomic_read(&conf->active_stripes) == 0 && |
5231 | atomic_read(&conf->active_aligned_reads) == 0, | |
72626685 N |
5232 | conf->device_lock, /* nothing */); |
5233 | spin_unlock_irq(&conf->device_lock); | |
5234 | break; | |
5235 | ||
5236 | case 0: /* re-enable writes */ | |
5237 | spin_lock_irq(&conf->device_lock); | |
5238 | conf->quiesce = 0; | |
5239 | wake_up(&conf->wait_for_stripe); | |
e464eafd | 5240 | wake_up(&conf->wait_for_overlap); |
72626685 N |
5241 | spin_unlock_irq(&conf->device_lock); |
5242 | break; | |
5243 | } | |
72626685 | 5244 | } |
b15c2e57 | 5245 | |
d562b0c4 N |
5246 | |
5247 | static void *raid5_takeover_raid1(mddev_t *mddev) | |
5248 | { | |
5249 | int chunksect; | |
5250 | ||
5251 | if (mddev->raid_disks != 2 || | |
5252 | mddev->degraded > 1) | |
5253 | return ERR_PTR(-EINVAL); | |
5254 | ||
5255 | /* Should check if there are write-behind devices? */ | |
5256 | ||
5257 | chunksect = 64*2; /* 64K by default */ | |
5258 | ||
5259 | /* The array must be an exact multiple of chunksize */ | |
5260 | while (chunksect && (mddev->array_sectors & (chunksect-1))) | |
5261 | chunksect >>= 1; | |
5262 | ||
5263 | if ((chunksect<<9) < STRIPE_SIZE) | |
5264 | /* array size does not allow a suitable chunk size */ | |
5265 | return ERR_PTR(-EINVAL); | |
5266 | ||
5267 | mddev->new_level = 5; | |
5268 | mddev->new_layout = ALGORITHM_LEFT_SYMMETRIC; | |
5269 | mddev->new_chunk = chunksect << 9; | |
5270 | ||
5271 | return setup_conf(mddev); | |
5272 | } | |
5273 | ||
fc9739c6 N |
5274 | static void *raid5_takeover_raid6(mddev_t *mddev) |
5275 | { | |
5276 | int new_layout; | |
5277 | ||
5278 | switch (mddev->layout) { | |
5279 | case ALGORITHM_LEFT_ASYMMETRIC_6: | |
5280 | new_layout = ALGORITHM_LEFT_ASYMMETRIC; | |
5281 | break; | |
5282 | case ALGORITHM_RIGHT_ASYMMETRIC_6: | |
5283 | new_layout = ALGORITHM_RIGHT_ASYMMETRIC; | |
5284 | break; | |
5285 | case ALGORITHM_LEFT_SYMMETRIC_6: | |
5286 | new_layout = ALGORITHM_LEFT_SYMMETRIC; | |
5287 | break; | |
5288 | case ALGORITHM_RIGHT_SYMMETRIC_6: | |
5289 | new_layout = ALGORITHM_RIGHT_SYMMETRIC; | |
5290 | break; | |
5291 | case ALGORITHM_PARITY_0_6: | |
5292 | new_layout = ALGORITHM_PARITY_0; | |
5293 | break; | |
5294 | case ALGORITHM_PARITY_N: | |
5295 | new_layout = ALGORITHM_PARITY_N; | |
5296 | break; | |
5297 | default: | |
5298 | return ERR_PTR(-EINVAL); | |
5299 | } | |
5300 | mddev->new_level = 5; | |
5301 | mddev->new_layout = new_layout; | |
5302 | mddev->delta_disks = -1; | |
5303 | mddev->raid_disks -= 1; | |
5304 | return setup_conf(mddev); | |
5305 | } | |
5306 | ||
d562b0c4 | 5307 | |
b3546035 N |
5308 | static int raid5_reconfig(mddev_t *mddev, int new_layout, int new_chunk) |
5309 | { | |
88ce4930 N |
5310 | /* For a 2-drive array, the layout and chunk size can be changed |
5311 | * immediately as not restriping is needed. | |
5312 | * For larger arrays we record the new value - after validation | |
5313 | * to be used by a reshape pass. | |
b3546035 N |
5314 | */ |
5315 | raid5_conf_t *conf = mddev_to_conf(mddev); | |
5316 | ||
5317 | if (new_layout >= 0 && !algorithm_valid_raid5(new_layout)) | |
5318 | return -EINVAL; | |
5319 | if (new_chunk > 0) { | |
5320 | if (new_chunk & (new_chunk-1)) | |
5321 | /* not a power of 2 */ | |
5322 | return -EINVAL; | |
5323 | if (new_chunk < PAGE_SIZE) | |
5324 | return -EINVAL; | |
5325 | if (mddev->array_sectors & ((new_chunk>>9)-1)) | |
5326 | /* not factor of array size */ | |
5327 | return -EINVAL; | |
5328 | } | |
5329 | ||
5330 | /* They look valid */ | |
5331 | ||
88ce4930 | 5332 | if (mddev->raid_disks == 2) { |
b3546035 | 5333 | |
88ce4930 N |
5334 | if (new_layout >= 0) { |
5335 | conf->algorithm = new_layout; | |
5336 | mddev->layout = mddev->new_layout = new_layout; | |
5337 | } | |
5338 | if (new_chunk > 0) { | |
5339 | conf->chunk_size = new_chunk; | |
5340 | mddev->chunk_size = mddev->new_chunk = new_chunk; | |
5341 | } | |
5342 | set_bit(MD_CHANGE_DEVS, &mddev->flags); | |
5343 | md_wakeup_thread(mddev->thread); | |
5344 | } else { | |
5345 | if (new_layout >= 0) | |
5346 | mddev->new_layout = new_layout; | |
5347 | if (new_chunk > 0) | |
5348 | mddev->new_chunk = new_chunk; | |
b3546035 | 5349 | } |
88ce4930 N |
5350 | return 0; |
5351 | } | |
5352 | ||
5353 | static int raid6_reconfig(mddev_t *mddev, int new_layout, int new_chunk) | |
5354 | { | |
5355 | if (new_layout >= 0 && !algorithm_valid_raid6(new_layout)) | |
5356 | return -EINVAL; | |
b3546035 | 5357 | if (new_chunk > 0) { |
88ce4930 N |
5358 | if (new_chunk & (new_chunk-1)) |
5359 | /* not a power of 2 */ | |
5360 | return -EINVAL; | |
5361 | if (new_chunk < PAGE_SIZE) | |
5362 | return -EINVAL; | |
5363 | if (mddev->array_sectors & ((new_chunk>>9)-1)) | |
5364 | /* not factor of array size */ | |
5365 | return -EINVAL; | |
b3546035 | 5366 | } |
88ce4930 N |
5367 | |
5368 | /* They look valid */ | |
5369 | ||
5370 | if (new_layout >= 0) | |
5371 | mddev->new_layout = new_layout; | |
5372 | if (new_chunk > 0) | |
5373 | mddev->new_chunk = new_chunk; | |
5374 | ||
b3546035 N |
5375 | return 0; |
5376 | } | |
5377 | ||
d562b0c4 N |
5378 | static void *raid5_takeover(mddev_t *mddev) |
5379 | { | |
5380 | /* raid5 can take over: | |
5381 | * raid0 - if all devices are the same - make it a raid4 layout | |
5382 | * raid1 - if there are two drives. We need to know the chunk size | |
5383 | * raid4 - trivial - just use a raid4 layout. | |
5384 | * raid6 - Providing it is a *_6 layout | |
5385 | * | |
5386 | * For now, just do raid1 | |
5387 | */ | |
5388 | ||
5389 | if (mddev->level == 1) | |
5390 | return raid5_takeover_raid1(mddev); | |
e9d4758f N |
5391 | if (mddev->level == 4) { |
5392 | mddev->new_layout = ALGORITHM_PARITY_N; | |
5393 | mddev->new_level = 5; | |
5394 | return setup_conf(mddev); | |
5395 | } | |
fc9739c6 N |
5396 | if (mddev->level == 6) |
5397 | return raid5_takeover_raid6(mddev); | |
d562b0c4 N |
5398 | |
5399 | return ERR_PTR(-EINVAL); | |
5400 | } | |
5401 | ||
5402 | ||
245f46c2 N |
5403 | static struct mdk_personality raid5_personality; |
5404 | ||
5405 | static void *raid6_takeover(mddev_t *mddev) | |
5406 | { | |
5407 | /* Currently can only take over a raid5. We map the | |
5408 | * personality to an equivalent raid6 personality | |
5409 | * with the Q block at the end. | |
5410 | */ | |
5411 | int new_layout; | |
5412 | ||
5413 | if (mddev->pers != &raid5_personality) | |
5414 | return ERR_PTR(-EINVAL); | |
5415 | if (mddev->degraded > 1) | |
5416 | return ERR_PTR(-EINVAL); | |
5417 | if (mddev->raid_disks > 253) | |
5418 | return ERR_PTR(-EINVAL); | |
5419 | if (mddev->raid_disks < 3) | |
5420 | return ERR_PTR(-EINVAL); | |
5421 | ||
5422 | switch (mddev->layout) { | |
5423 | case ALGORITHM_LEFT_ASYMMETRIC: | |
5424 | new_layout = ALGORITHM_LEFT_ASYMMETRIC_6; | |
5425 | break; | |
5426 | case ALGORITHM_RIGHT_ASYMMETRIC: | |
5427 | new_layout = ALGORITHM_RIGHT_ASYMMETRIC_6; | |
5428 | break; | |
5429 | case ALGORITHM_LEFT_SYMMETRIC: | |
5430 | new_layout = ALGORITHM_LEFT_SYMMETRIC_6; | |
5431 | break; | |
5432 | case ALGORITHM_RIGHT_SYMMETRIC: | |
5433 | new_layout = ALGORITHM_RIGHT_SYMMETRIC_6; | |
5434 | break; | |
5435 | case ALGORITHM_PARITY_0: | |
5436 | new_layout = ALGORITHM_PARITY_0_6; | |
5437 | break; | |
5438 | case ALGORITHM_PARITY_N: | |
5439 | new_layout = ALGORITHM_PARITY_N; | |
5440 | break; | |
5441 | default: | |
5442 | return ERR_PTR(-EINVAL); | |
5443 | } | |
5444 | mddev->new_level = 6; | |
5445 | mddev->new_layout = new_layout; | |
5446 | mddev->delta_disks = 1; | |
5447 | mddev->raid_disks += 1; | |
5448 | return setup_conf(mddev); | |
5449 | } | |
5450 | ||
5451 | ||
16a53ecc N |
5452 | static struct mdk_personality raid6_personality = |
5453 | { | |
5454 | .name = "raid6", | |
5455 | .level = 6, | |
5456 | .owner = THIS_MODULE, | |
5457 | .make_request = make_request, | |
5458 | .run = run, | |
5459 | .stop = stop, | |
5460 | .status = status, | |
5461 | .error_handler = error, | |
5462 | .hot_add_disk = raid5_add_disk, | |
5463 | .hot_remove_disk= raid5_remove_disk, | |
5464 | .spare_active = raid5_spare_active, | |
5465 | .sync_request = sync_request, | |
5466 | .resize = raid5_resize, | |
80c3a6ce | 5467 | .size = raid5_size, |
f416885e N |
5468 | .check_reshape = raid5_check_reshape, |
5469 | .start_reshape = raid5_start_reshape, | |
cea9c228 | 5470 | .finish_reshape = raid5_finish_reshape, |
16a53ecc | 5471 | .quiesce = raid5_quiesce, |
245f46c2 | 5472 | .takeover = raid6_takeover, |
88ce4930 | 5473 | .reconfig = raid6_reconfig, |
16a53ecc | 5474 | }; |
2604b703 | 5475 | static struct mdk_personality raid5_personality = |
1da177e4 LT |
5476 | { |
5477 | .name = "raid5", | |
2604b703 | 5478 | .level = 5, |
1da177e4 LT |
5479 | .owner = THIS_MODULE, |
5480 | .make_request = make_request, | |
5481 | .run = run, | |
5482 | .stop = stop, | |
5483 | .status = status, | |
5484 | .error_handler = error, | |
5485 | .hot_add_disk = raid5_add_disk, | |
5486 | .hot_remove_disk= raid5_remove_disk, | |
5487 | .spare_active = raid5_spare_active, | |
5488 | .sync_request = sync_request, | |
5489 | .resize = raid5_resize, | |
80c3a6ce | 5490 | .size = raid5_size, |
63c70c4f N |
5491 | .check_reshape = raid5_check_reshape, |
5492 | .start_reshape = raid5_start_reshape, | |
cea9c228 | 5493 | .finish_reshape = raid5_finish_reshape, |
72626685 | 5494 | .quiesce = raid5_quiesce, |
d562b0c4 | 5495 | .takeover = raid5_takeover, |
b3546035 | 5496 | .reconfig = raid5_reconfig, |
1da177e4 LT |
5497 | }; |
5498 | ||
2604b703 | 5499 | static struct mdk_personality raid4_personality = |
1da177e4 | 5500 | { |
2604b703 N |
5501 | .name = "raid4", |
5502 | .level = 4, | |
5503 | .owner = THIS_MODULE, | |
5504 | .make_request = make_request, | |
5505 | .run = run, | |
5506 | .stop = stop, | |
5507 | .status = status, | |
5508 | .error_handler = error, | |
5509 | .hot_add_disk = raid5_add_disk, | |
5510 | .hot_remove_disk= raid5_remove_disk, | |
5511 | .spare_active = raid5_spare_active, | |
5512 | .sync_request = sync_request, | |
5513 | .resize = raid5_resize, | |
80c3a6ce | 5514 | .size = raid5_size, |
3d37890b N |
5515 | .check_reshape = raid5_check_reshape, |
5516 | .start_reshape = raid5_start_reshape, | |
cea9c228 | 5517 | .finish_reshape = raid5_finish_reshape, |
2604b703 N |
5518 | .quiesce = raid5_quiesce, |
5519 | }; | |
5520 | ||
5521 | static int __init raid5_init(void) | |
5522 | { | |
16a53ecc | 5523 | register_md_personality(&raid6_personality); |
2604b703 N |
5524 | register_md_personality(&raid5_personality); |
5525 | register_md_personality(&raid4_personality); | |
5526 | return 0; | |
1da177e4 LT |
5527 | } |
5528 | ||
2604b703 | 5529 | static void raid5_exit(void) |
1da177e4 | 5530 | { |
16a53ecc | 5531 | unregister_md_personality(&raid6_personality); |
2604b703 N |
5532 | unregister_md_personality(&raid5_personality); |
5533 | unregister_md_personality(&raid4_personality); | |
1da177e4 LT |
5534 | } |
5535 | ||
5536 | module_init(raid5_init); | |
5537 | module_exit(raid5_exit); | |
5538 | MODULE_LICENSE("GPL"); | |
5539 | MODULE_ALIAS("md-personality-4"); /* RAID5 */ | |
d9d166c2 N |
5540 | MODULE_ALIAS("md-raid5"); |
5541 | MODULE_ALIAS("md-raid4"); | |
2604b703 N |
5542 | MODULE_ALIAS("md-level-5"); |
5543 | MODULE_ALIAS("md-level-4"); | |
16a53ecc N |
5544 | MODULE_ALIAS("md-personality-8"); /* RAID6 */ |
5545 | MODULE_ALIAS("md-raid6"); | |
5546 | MODULE_ALIAS("md-level-6"); | |
5547 | ||
5548 | /* This used to be two separate modules, they were: */ | |
5549 | MODULE_ALIAS("raid5"); | |
5550 | MODULE_ALIAS("raid6"); |