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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> |
07a3b417 | 50 | #include <linux/async.h> |
bff61975 | 51 | #include <linux/seq_file.h> |
36d1c647 | 52 | #include <linux/cpu.h> |
5a0e3ad6 | 53 | #include <linux/slab.h> |
43b2e5d8 | 54 | #include "md.h" |
bff61975 | 55 | #include "raid5.h" |
54071b38 | 56 | #include "raid0.h" |
ef740c37 | 57 | #include "bitmap.h" |
72626685 | 58 | |
1da177e4 LT |
59 | /* |
60 | * Stripe cache | |
61 | */ | |
62 | ||
63 | #define NR_STRIPES 256 | |
64 | #define STRIPE_SIZE PAGE_SIZE | |
65 | #define STRIPE_SHIFT (PAGE_SHIFT - 9) | |
66 | #define STRIPE_SECTORS (STRIPE_SIZE>>9) | |
67 | #define IO_THRESHOLD 1 | |
8b3e6cdc | 68 | #define BYPASS_THRESHOLD 1 |
fccddba0 | 69 | #define NR_HASH (PAGE_SIZE / sizeof(struct hlist_head)) |
1da177e4 LT |
70 | #define HASH_MASK (NR_HASH - 1) |
71 | ||
fccddba0 | 72 | #define stripe_hash(conf, sect) (&((conf)->stripe_hashtbl[((sect) >> STRIPE_SHIFT) & HASH_MASK])) |
1da177e4 LT |
73 | |
74 | /* bio's attached to a stripe+device for I/O are linked together in bi_sector | |
75 | * order without overlap. There may be several bio's per stripe+device, and | |
76 | * a bio could span several devices. | |
77 | * When walking this list for a particular stripe+device, we must never proceed | |
78 | * beyond a bio that extends past this device, as the next bio might no longer | |
79 | * be valid. | |
80 | * This macro is used to determine the 'next' bio in the list, given the sector | |
81 | * of the current stripe+device | |
82 | */ | |
83 | #define r5_next_bio(bio, sect) ( ( (bio)->bi_sector + ((bio)->bi_size>>9) < sect + STRIPE_SECTORS) ? (bio)->bi_next : NULL) | |
84 | /* | |
85 | * The following can be used to debug the driver | |
86 | */ | |
1da177e4 LT |
87 | #define RAID5_PARANOIA 1 |
88 | #if RAID5_PARANOIA && defined(CONFIG_SMP) | |
89 | # define CHECK_DEVLOCK() assert_spin_locked(&conf->device_lock) | |
90 | #else | |
91 | # define CHECK_DEVLOCK() | |
92 | #endif | |
93 | ||
45b4233c | 94 | #ifdef DEBUG |
1da177e4 LT |
95 | #define inline |
96 | #define __inline__ | |
97 | #endif | |
98 | ||
6be9d494 BS |
99 | #define printk_rl(args...) ((void) (printk_ratelimit() && printk(args))) |
100 | ||
960e739d | 101 | /* |
5b99c2ff JA |
102 | * We maintain a biased count of active stripes in the bottom 16 bits of |
103 | * bi_phys_segments, and a count of processed stripes in the upper 16 bits | |
960e739d JA |
104 | */ |
105 | static inline int raid5_bi_phys_segments(struct bio *bio) | |
106 | { | |
5b99c2ff | 107 | return bio->bi_phys_segments & 0xffff; |
960e739d JA |
108 | } |
109 | ||
110 | static inline int raid5_bi_hw_segments(struct bio *bio) | |
111 | { | |
5b99c2ff | 112 | return (bio->bi_phys_segments >> 16) & 0xffff; |
960e739d JA |
113 | } |
114 | ||
115 | static inline int raid5_dec_bi_phys_segments(struct bio *bio) | |
116 | { | |
117 | --bio->bi_phys_segments; | |
118 | return raid5_bi_phys_segments(bio); | |
119 | } | |
120 | ||
121 | static inline int raid5_dec_bi_hw_segments(struct bio *bio) | |
122 | { | |
123 | unsigned short val = raid5_bi_hw_segments(bio); | |
124 | ||
125 | --val; | |
5b99c2ff | 126 | bio->bi_phys_segments = (val << 16) | raid5_bi_phys_segments(bio); |
960e739d JA |
127 | return val; |
128 | } | |
129 | ||
130 | static inline void raid5_set_bi_hw_segments(struct bio *bio, unsigned int cnt) | |
131 | { | |
5b99c2ff | 132 | bio->bi_phys_segments = raid5_bi_phys_segments(bio) || (cnt << 16); |
960e739d JA |
133 | } |
134 | ||
d0dabf7e N |
135 | /* Find first data disk in a raid6 stripe */ |
136 | static inline int raid6_d0(struct stripe_head *sh) | |
137 | { | |
67cc2b81 N |
138 | if (sh->ddf_layout) |
139 | /* ddf always start from first device */ | |
140 | return 0; | |
141 | /* md starts just after Q block */ | |
d0dabf7e N |
142 | if (sh->qd_idx == sh->disks - 1) |
143 | return 0; | |
144 | else | |
145 | return sh->qd_idx + 1; | |
146 | } | |
16a53ecc N |
147 | static inline int raid6_next_disk(int disk, int raid_disks) |
148 | { | |
149 | disk++; | |
150 | return (disk < raid_disks) ? disk : 0; | |
151 | } | |
a4456856 | 152 | |
d0dabf7e N |
153 | /* When walking through the disks in a raid5, starting at raid6_d0, |
154 | * We need to map each disk to a 'slot', where the data disks are slot | |
155 | * 0 .. raid_disks-3, the parity disk is raid_disks-2 and the Q disk | |
156 | * is raid_disks-1. This help does that mapping. | |
157 | */ | |
67cc2b81 N |
158 | static int raid6_idx_to_slot(int idx, struct stripe_head *sh, |
159 | int *count, int syndrome_disks) | |
d0dabf7e | 160 | { |
6629542e | 161 | int slot = *count; |
67cc2b81 | 162 | |
e4424fee | 163 | if (sh->ddf_layout) |
6629542e | 164 | (*count)++; |
d0dabf7e | 165 | if (idx == sh->pd_idx) |
67cc2b81 | 166 | return syndrome_disks; |
d0dabf7e | 167 | if (idx == sh->qd_idx) |
67cc2b81 | 168 | return syndrome_disks + 1; |
e4424fee | 169 | if (!sh->ddf_layout) |
6629542e | 170 | (*count)++; |
d0dabf7e N |
171 | return slot; |
172 | } | |
173 | ||
a4456856 DW |
174 | static void return_io(struct bio *return_bi) |
175 | { | |
176 | struct bio *bi = return_bi; | |
177 | while (bi) { | |
a4456856 DW |
178 | |
179 | return_bi = bi->bi_next; | |
180 | bi->bi_next = NULL; | |
181 | bi->bi_size = 0; | |
0e13fe23 | 182 | bio_endio(bi, 0); |
a4456856 DW |
183 | bi = return_bi; |
184 | } | |
185 | } | |
186 | ||
1da177e4 LT |
187 | static void print_raid5_conf (raid5_conf_t *conf); |
188 | ||
600aa109 DW |
189 | static int stripe_operations_active(struct stripe_head *sh) |
190 | { | |
191 | return sh->check_state || sh->reconstruct_state || | |
192 | test_bit(STRIPE_BIOFILL_RUN, &sh->state) || | |
193 | test_bit(STRIPE_COMPUTE_RUN, &sh->state); | |
194 | } | |
195 | ||
858119e1 | 196 | static void __release_stripe(raid5_conf_t *conf, struct stripe_head *sh) |
1da177e4 LT |
197 | { |
198 | if (atomic_dec_and_test(&sh->count)) { | |
78bafebd ES |
199 | BUG_ON(!list_empty(&sh->lru)); |
200 | BUG_ON(atomic_read(&conf->active_stripes)==0); | |
1da177e4 | 201 | if (test_bit(STRIPE_HANDLE, &sh->state)) { |
7c785b7a | 202 | if (test_bit(STRIPE_DELAYED, &sh->state)) { |
1da177e4 | 203 | list_add_tail(&sh->lru, &conf->delayed_list); |
2ac87401 | 204 | plugger_set_plug(&conf->plug); |
7c785b7a | 205 | } else if (test_bit(STRIPE_BIT_DELAY, &sh->state) && |
ae3c20cc | 206 | sh->bm_seq - conf->seq_write > 0) { |
72626685 | 207 | list_add_tail(&sh->lru, &conf->bitmap_list); |
2ac87401 | 208 | plugger_set_plug(&conf->plug); |
7c785b7a | 209 | } else { |
72626685 | 210 | clear_bit(STRIPE_BIT_DELAY, &sh->state); |
1da177e4 | 211 | list_add_tail(&sh->lru, &conf->handle_list); |
72626685 | 212 | } |
1da177e4 LT |
213 | md_wakeup_thread(conf->mddev->thread); |
214 | } else { | |
600aa109 | 215 | BUG_ON(stripe_operations_active(sh)); |
1da177e4 LT |
216 | if (test_and_clear_bit(STRIPE_PREREAD_ACTIVE, &sh->state)) { |
217 | atomic_dec(&conf->preread_active_stripes); | |
218 | if (atomic_read(&conf->preread_active_stripes) < IO_THRESHOLD) | |
219 | md_wakeup_thread(conf->mddev->thread); | |
220 | } | |
1da177e4 | 221 | atomic_dec(&conf->active_stripes); |
ccfcc3c1 N |
222 | if (!test_bit(STRIPE_EXPANDING, &sh->state)) { |
223 | list_add_tail(&sh->lru, &conf->inactive_list); | |
1da177e4 | 224 | wake_up(&conf->wait_for_stripe); |
46031f9a RBJ |
225 | if (conf->retry_read_aligned) |
226 | md_wakeup_thread(conf->mddev->thread); | |
ccfcc3c1 | 227 | } |
1da177e4 LT |
228 | } |
229 | } | |
230 | } | |
d0dabf7e | 231 | |
1da177e4 LT |
232 | static void release_stripe(struct stripe_head *sh) |
233 | { | |
234 | raid5_conf_t *conf = sh->raid_conf; | |
235 | unsigned long flags; | |
16a53ecc | 236 | |
1da177e4 LT |
237 | spin_lock_irqsave(&conf->device_lock, flags); |
238 | __release_stripe(conf, sh); | |
239 | spin_unlock_irqrestore(&conf->device_lock, flags); | |
240 | } | |
241 | ||
fccddba0 | 242 | static inline void remove_hash(struct stripe_head *sh) |
1da177e4 | 243 | { |
45b4233c DW |
244 | pr_debug("remove_hash(), stripe %llu\n", |
245 | (unsigned long long)sh->sector); | |
1da177e4 | 246 | |
fccddba0 | 247 | hlist_del_init(&sh->hash); |
1da177e4 LT |
248 | } |
249 | ||
16a53ecc | 250 | static inline void insert_hash(raid5_conf_t *conf, struct stripe_head *sh) |
1da177e4 | 251 | { |
fccddba0 | 252 | struct hlist_head *hp = stripe_hash(conf, sh->sector); |
1da177e4 | 253 | |
45b4233c DW |
254 | pr_debug("insert_hash(), stripe %llu\n", |
255 | (unsigned long long)sh->sector); | |
1da177e4 LT |
256 | |
257 | CHECK_DEVLOCK(); | |
fccddba0 | 258 | hlist_add_head(&sh->hash, hp); |
1da177e4 LT |
259 | } |
260 | ||
261 | ||
262 | /* find an idle stripe, make sure it is unhashed, and return it. */ | |
263 | static struct stripe_head *get_free_stripe(raid5_conf_t *conf) | |
264 | { | |
265 | struct stripe_head *sh = NULL; | |
266 | struct list_head *first; | |
267 | ||
268 | CHECK_DEVLOCK(); | |
269 | if (list_empty(&conf->inactive_list)) | |
270 | goto out; | |
271 | first = conf->inactive_list.next; | |
272 | sh = list_entry(first, struct stripe_head, lru); | |
273 | list_del_init(first); | |
274 | remove_hash(sh); | |
275 | atomic_inc(&conf->active_stripes); | |
276 | out: | |
277 | return sh; | |
278 | } | |
279 | ||
e4e11e38 | 280 | static void shrink_buffers(struct stripe_head *sh) |
1da177e4 LT |
281 | { |
282 | struct page *p; | |
283 | int i; | |
e4e11e38 | 284 | int num = sh->raid_conf->pool_size; |
1da177e4 | 285 | |
e4e11e38 | 286 | for (i = 0; i < num ; i++) { |
1da177e4 LT |
287 | p = sh->dev[i].page; |
288 | if (!p) | |
289 | continue; | |
290 | sh->dev[i].page = NULL; | |
2d1f3b5d | 291 | put_page(p); |
1da177e4 LT |
292 | } |
293 | } | |
294 | ||
e4e11e38 | 295 | static int grow_buffers(struct stripe_head *sh) |
1da177e4 LT |
296 | { |
297 | int i; | |
e4e11e38 | 298 | int num = sh->raid_conf->pool_size; |
1da177e4 | 299 | |
e4e11e38 | 300 | for (i = 0; i < num; i++) { |
1da177e4 LT |
301 | struct page *page; |
302 | ||
303 | if (!(page = alloc_page(GFP_KERNEL))) { | |
304 | return 1; | |
305 | } | |
306 | sh->dev[i].page = page; | |
307 | } | |
308 | return 0; | |
309 | } | |
310 | ||
784052ec | 311 | static void raid5_build_block(struct stripe_head *sh, int i, int previous); |
911d4ee8 N |
312 | static void stripe_set_idx(sector_t stripe, raid5_conf_t *conf, int previous, |
313 | struct stripe_head *sh); | |
1da177e4 | 314 | |
b5663ba4 | 315 | static void init_stripe(struct stripe_head *sh, sector_t sector, int previous) |
1da177e4 LT |
316 | { |
317 | raid5_conf_t *conf = sh->raid_conf; | |
7ecaa1e6 | 318 | int i; |
1da177e4 | 319 | |
78bafebd ES |
320 | BUG_ON(atomic_read(&sh->count) != 0); |
321 | BUG_ON(test_bit(STRIPE_HANDLE, &sh->state)); | |
600aa109 | 322 | BUG_ON(stripe_operations_active(sh)); |
d84e0f10 | 323 | |
1da177e4 | 324 | CHECK_DEVLOCK(); |
45b4233c | 325 | pr_debug("init_stripe called, stripe %llu\n", |
1da177e4 LT |
326 | (unsigned long long)sh->sector); |
327 | ||
328 | remove_hash(sh); | |
16a53ecc | 329 | |
86b42c71 | 330 | sh->generation = conf->generation - previous; |
b5663ba4 | 331 | sh->disks = previous ? conf->previous_raid_disks : conf->raid_disks; |
1da177e4 | 332 | sh->sector = sector; |
911d4ee8 | 333 | stripe_set_idx(sector, conf, previous, sh); |
1da177e4 LT |
334 | sh->state = 0; |
335 | ||
7ecaa1e6 N |
336 | |
337 | for (i = sh->disks; i--; ) { | |
1da177e4 LT |
338 | struct r5dev *dev = &sh->dev[i]; |
339 | ||
d84e0f10 | 340 | if (dev->toread || dev->read || dev->towrite || dev->written || |
1da177e4 | 341 | test_bit(R5_LOCKED, &dev->flags)) { |
d84e0f10 | 342 | printk(KERN_ERR "sector=%llx i=%d %p %p %p %p %d\n", |
1da177e4 | 343 | (unsigned long long)sh->sector, i, dev->toread, |
d84e0f10 | 344 | dev->read, dev->towrite, dev->written, |
1da177e4 LT |
345 | test_bit(R5_LOCKED, &dev->flags)); |
346 | BUG(); | |
347 | } | |
348 | dev->flags = 0; | |
784052ec | 349 | raid5_build_block(sh, i, previous); |
1da177e4 LT |
350 | } |
351 | insert_hash(conf, sh); | |
352 | } | |
353 | ||
86b42c71 N |
354 | static struct stripe_head *__find_stripe(raid5_conf_t *conf, sector_t sector, |
355 | short generation) | |
1da177e4 LT |
356 | { |
357 | struct stripe_head *sh; | |
fccddba0 | 358 | struct hlist_node *hn; |
1da177e4 LT |
359 | |
360 | CHECK_DEVLOCK(); | |
45b4233c | 361 | pr_debug("__find_stripe, sector %llu\n", (unsigned long long)sector); |
fccddba0 | 362 | hlist_for_each_entry(sh, hn, stripe_hash(conf, sector), hash) |
86b42c71 | 363 | if (sh->sector == sector && sh->generation == generation) |
1da177e4 | 364 | return sh; |
45b4233c | 365 | pr_debug("__stripe %llu not in cache\n", (unsigned long long)sector); |
1da177e4 LT |
366 | return NULL; |
367 | } | |
368 | ||
674806d6 N |
369 | /* |
370 | * Need to check if array has failed when deciding whether to: | |
371 | * - start an array | |
372 | * - remove non-faulty devices | |
373 | * - add a spare | |
374 | * - allow a reshape | |
375 | * This determination is simple when no reshape is happening. | |
376 | * However if there is a reshape, we need to carefully check | |
377 | * both the before and after sections. | |
378 | * This is because some failed devices may only affect one | |
379 | * of the two sections, and some non-in_sync devices may | |
380 | * be insync in the section most affected by failed devices. | |
381 | */ | |
382 | static int has_failed(raid5_conf_t *conf) | |
383 | { | |
384 | int degraded; | |
385 | int i; | |
386 | if (conf->mddev->reshape_position == MaxSector) | |
387 | return conf->mddev->degraded > conf->max_degraded; | |
388 | ||
389 | rcu_read_lock(); | |
390 | degraded = 0; | |
391 | for (i = 0; i < conf->previous_raid_disks; i++) { | |
392 | mdk_rdev_t *rdev = rcu_dereference(conf->disks[i].rdev); | |
393 | if (!rdev || test_bit(Faulty, &rdev->flags)) | |
394 | degraded++; | |
395 | else if (test_bit(In_sync, &rdev->flags)) | |
396 | ; | |
397 | else | |
398 | /* not in-sync or faulty. | |
399 | * If the reshape increases the number of devices, | |
400 | * this is being recovered by the reshape, so | |
401 | * this 'previous' section is not in_sync. | |
402 | * If the number of devices is being reduced however, | |
403 | * the device can only be part of the array if | |
404 | * we are reverting a reshape, so this section will | |
405 | * be in-sync. | |
406 | */ | |
407 | if (conf->raid_disks >= conf->previous_raid_disks) | |
408 | degraded++; | |
409 | } | |
410 | rcu_read_unlock(); | |
411 | if (degraded > conf->max_degraded) | |
412 | return 1; | |
413 | rcu_read_lock(); | |
414 | degraded = 0; | |
415 | for (i = 0; i < conf->raid_disks; i++) { | |
416 | mdk_rdev_t *rdev = rcu_dereference(conf->disks[i].rdev); | |
417 | if (!rdev || test_bit(Faulty, &rdev->flags)) | |
418 | degraded++; | |
419 | else if (test_bit(In_sync, &rdev->flags)) | |
420 | ; | |
421 | else | |
422 | /* not in-sync or faulty. | |
423 | * If reshape increases the number of devices, this | |
424 | * section has already been recovered, else it | |
425 | * almost certainly hasn't. | |
426 | */ | |
427 | if (conf->raid_disks <= conf->previous_raid_disks) | |
428 | degraded++; | |
429 | } | |
430 | rcu_read_unlock(); | |
431 | if (degraded > conf->max_degraded) | |
432 | return 1; | |
433 | return 0; | |
434 | } | |
435 | ||
1da177e4 | 436 | static void unplug_slaves(mddev_t *mddev); |
1da177e4 | 437 | |
b5663ba4 N |
438 | static struct stripe_head * |
439 | get_active_stripe(raid5_conf_t *conf, sector_t sector, | |
a8c906ca | 440 | int previous, int noblock, int noquiesce) |
1da177e4 LT |
441 | { |
442 | struct stripe_head *sh; | |
443 | ||
45b4233c | 444 | pr_debug("get_stripe, sector %llu\n", (unsigned long long)sector); |
1da177e4 LT |
445 | |
446 | spin_lock_irq(&conf->device_lock); | |
447 | ||
448 | do { | |
72626685 | 449 | wait_event_lock_irq(conf->wait_for_stripe, |
a8c906ca | 450 | conf->quiesce == 0 || noquiesce, |
72626685 | 451 | conf->device_lock, /* nothing */); |
86b42c71 | 452 | sh = __find_stripe(conf, sector, conf->generation - previous); |
1da177e4 LT |
453 | if (!sh) { |
454 | if (!conf->inactive_blocked) | |
455 | sh = get_free_stripe(conf); | |
456 | if (noblock && sh == NULL) | |
457 | break; | |
458 | if (!sh) { | |
459 | conf->inactive_blocked = 1; | |
460 | wait_event_lock_irq(conf->wait_for_stripe, | |
461 | !list_empty(&conf->inactive_list) && | |
5036805b N |
462 | (atomic_read(&conf->active_stripes) |
463 | < (conf->max_nr_stripes *3/4) | |
1da177e4 LT |
464 | || !conf->inactive_blocked), |
465 | conf->device_lock, | |
9f7c2220 | 466 | md_raid5_unplug_device(conf) |
1da177e4 LT |
467 | ); |
468 | conf->inactive_blocked = 0; | |
469 | } else | |
b5663ba4 | 470 | init_stripe(sh, sector, previous); |
1da177e4 LT |
471 | } else { |
472 | if (atomic_read(&sh->count)) { | |
ab69ae12 N |
473 | BUG_ON(!list_empty(&sh->lru) |
474 | && !test_bit(STRIPE_EXPANDING, &sh->state)); | |
1da177e4 LT |
475 | } else { |
476 | if (!test_bit(STRIPE_HANDLE, &sh->state)) | |
477 | atomic_inc(&conf->active_stripes); | |
ff4e8d9a N |
478 | if (list_empty(&sh->lru) && |
479 | !test_bit(STRIPE_EXPANDING, &sh->state)) | |
16a53ecc N |
480 | BUG(); |
481 | list_del_init(&sh->lru); | |
1da177e4 LT |
482 | } |
483 | } | |
484 | } while (sh == NULL); | |
485 | ||
486 | if (sh) | |
487 | atomic_inc(&sh->count); | |
488 | ||
489 | spin_unlock_irq(&conf->device_lock); | |
490 | return sh; | |
491 | } | |
492 | ||
6712ecf8 N |
493 | static void |
494 | raid5_end_read_request(struct bio *bi, int error); | |
495 | static void | |
496 | raid5_end_write_request(struct bio *bi, int error); | |
91c00924 | 497 | |
c4e5ac0a | 498 | static void ops_run_io(struct stripe_head *sh, struct stripe_head_state *s) |
91c00924 DW |
499 | { |
500 | raid5_conf_t *conf = sh->raid_conf; | |
501 | int i, disks = sh->disks; | |
502 | ||
503 | might_sleep(); | |
504 | ||
505 | for (i = disks; i--; ) { | |
506 | int rw; | |
507 | struct bio *bi; | |
508 | mdk_rdev_t *rdev; | |
509 | if (test_and_clear_bit(R5_Wantwrite, &sh->dev[i].flags)) | |
510 | rw = WRITE; | |
511 | else if (test_and_clear_bit(R5_Wantread, &sh->dev[i].flags)) | |
512 | rw = READ; | |
513 | else | |
514 | continue; | |
515 | ||
516 | bi = &sh->dev[i].req; | |
517 | ||
518 | bi->bi_rw = rw; | |
519 | if (rw == WRITE) | |
520 | bi->bi_end_io = raid5_end_write_request; | |
521 | else | |
522 | bi->bi_end_io = raid5_end_read_request; | |
523 | ||
524 | rcu_read_lock(); | |
525 | rdev = rcu_dereference(conf->disks[i].rdev); | |
526 | if (rdev && test_bit(Faulty, &rdev->flags)) | |
527 | rdev = NULL; | |
528 | if (rdev) | |
529 | atomic_inc(&rdev->nr_pending); | |
530 | rcu_read_unlock(); | |
531 | ||
532 | if (rdev) { | |
c4e5ac0a | 533 | if (s->syncing || s->expanding || s->expanded) |
91c00924 DW |
534 | md_sync_acct(rdev->bdev, STRIPE_SECTORS); |
535 | ||
2b7497f0 DW |
536 | set_bit(STRIPE_IO_STARTED, &sh->state); |
537 | ||
91c00924 DW |
538 | bi->bi_bdev = rdev->bdev; |
539 | pr_debug("%s: for %llu schedule op %ld on disc %d\n", | |
e46b272b | 540 | __func__, (unsigned long long)sh->sector, |
91c00924 DW |
541 | bi->bi_rw, i); |
542 | atomic_inc(&sh->count); | |
543 | bi->bi_sector = sh->sector + rdev->data_offset; | |
544 | bi->bi_flags = 1 << BIO_UPTODATE; | |
545 | bi->bi_vcnt = 1; | |
546 | bi->bi_max_vecs = 1; | |
547 | bi->bi_idx = 0; | |
548 | bi->bi_io_vec = &sh->dev[i].vec; | |
549 | bi->bi_io_vec[0].bv_len = STRIPE_SIZE; | |
550 | bi->bi_io_vec[0].bv_offset = 0; | |
551 | bi->bi_size = STRIPE_SIZE; | |
552 | bi->bi_next = NULL; | |
553 | if (rw == WRITE && | |
554 | test_bit(R5_ReWrite, &sh->dev[i].flags)) | |
555 | atomic_add(STRIPE_SECTORS, | |
556 | &rdev->corrected_errors); | |
557 | generic_make_request(bi); | |
558 | } else { | |
559 | if (rw == WRITE) | |
560 | set_bit(STRIPE_DEGRADED, &sh->state); | |
561 | pr_debug("skip op %ld on disc %d for sector %llu\n", | |
562 | bi->bi_rw, i, (unsigned long long)sh->sector); | |
563 | clear_bit(R5_LOCKED, &sh->dev[i].flags); | |
564 | set_bit(STRIPE_HANDLE, &sh->state); | |
565 | } | |
566 | } | |
567 | } | |
568 | ||
569 | static struct dma_async_tx_descriptor * | |
570 | async_copy_data(int frombio, struct bio *bio, struct page *page, | |
571 | sector_t sector, struct dma_async_tx_descriptor *tx) | |
572 | { | |
573 | struct bio_vec *bvl; | |
574 | struct page *bio_page; | |
575 | int i; | |
576 | int page_offset; | |
a08abd8c | 577 | struct async_submit_ctl submit; |
0403e382 | 578 | enum async_tx_flags flags = 0; |
91c00924 DW |
579 | |
580 | if (bio->bi_sector >= sector) | |
581 | page_offset = (signed)(bio->bi_sector - sector) * 512; | |
582 | else | |
583 | page_offset = (signed)(sector - bio->bi_sector) * -512; | |
a08abd8c | 584 | |
0403e382 DW |
585 | if (frombio) |
586 | flags |= ASYNC_TX_FENCE; | |
587 | init_async_submit(&submit, flags, tx, NULL, NULL, NULL); | |
588 | ||
91c00924 DW |
589 | bio_for_each_segment(bvl, bio, i) { |
590 | int len = bio_iovec_idx(bio, i)->bv_len; | |
591 | int clen; | |
592 | int b_offset = 0; | |
593 | ||
594 | if (page_offset < 0) { | |
595 | b_offset = -page_offset; | |
596 | page_offset += b_offset; | |
597 | len -= b_offset; | |
598 | } | |
599 | ||
600 | if (len > 0 && page_offset + len > STRIPE_SIZE) | |
601 | clen = STRIPE_SIZE - page_offset; | |
602 | else | |
603 | clen = len; | |
604 | ||
605 | if (clen > 0) { | |
606 | b_offset += bio_iovec_idx(bio, i)->bv_offset; | |
607 | bio_page = bio_iovec_idx(bio, i)->bv_page; | |
608 | if (frombio) | |
609 | tx = async_memcpy(page, bio_page, page_offset, | |
a08abd8c | 610 | b_offset, clen, &submit); |
91c00924 DW |
611 | else |
612 | tx = async_memcpy(bio_page, page, b_offset, | |
a08abd8c | 613 | page_offset, clen, &submit); |
91c00924 | 614 | } |
a08abd8c DW |
615 | /* chain the operations */ |
616 | submit.depend_tx = tx; | |
617 | ||
91c00924 DW |
618 | if (clen < len) /* hit end of page */ |
619 | break; | |
620 | page_offset += len; | |
621 | } | |
622 | ||
623 | return tx; | |
624 | } | |
625 | ||
626 | static void ops_complete_biofill(void *stripe_head_ref) | |
627 | { | |
628 | struct stripe_head *sh = stripe_head_ref; | |
629 | struct bio *return_bi = NULL; | |
630 | raid5_conf_t *conf = sh->raid_conf; | |
e4d84909 | 631 | int i; |
91c00924 | 632 | |
e46b272b | 633 | pr_debug("%s: stripe %llu\n", __func__, |
91c00924 DW |
634 | (unsigned long long)sh->sector); |
635 | ||
636 | /* clear completed biofills */ | |
83de75cc | 637 | spin_lock_irq(&conf->device_lock); |
91c00924 DW |
638 | for (i = sh->disks; i--; ) { |
639 | struct r5dev *dev = &sh->dev[i]; | |
91c00924 DW |
640 | |
641 | /* acknowledge completion of a biofill operation */ | |
e4d84909 DW |
642 | /* and check if we need to reply to a read request, |
643 | * new R5_Wantfill requests are held off until | |
83de75cc | 644 | * !STRIPE_BIOFILL_RUN |
e4d84909 DW |
645 | */ |
646 | if (test_and_clear_bit(R5_Wantfill, &dev->flags)) { | |
91c00924 | 647 | struct bio *rbi, *rbi2; |
91c00924 | 648 | |
91c00924 DW |
649 | BUG_ON(!dev->read); |
650 | rbi = dev->read; | |
651 | dev->read = NULL; | |
652 | while (rbi && rbi->bi_sector < | |
653 | dev->sector + STRIPE_SECTORS) { | |
654 | rbi2 = r5_next_bio(rbi, dev->sector); | |
960e739d | 655 | if (!raid5_dec_bi_phys_segments(rbi)) { |
91c00924 DW |
656 | rbi->bi_next = return_bi; |
657 | return_bi = rbi; | |
658 | } | |
91c00924 DW |
659 | rbi = rbi2; |
660 | } | |
661 | } | |
662 | } | |
83de75cc DW |
663 | spin_unlock_irq(&conf->device_lock); |
664 | clear_bit(STRIPE_BIOFILL_RUN, &sh->state); | |
91c00924 DW |
665 | |
666 | return_io(return_bi); | |
667 | ||
e4d84909 | 668 | set_bit(STRIPE_HANDLE, &sh->state); |
91c00924 DW |
669 | release_stripe(sh); |
670 | } | |
671 | ||
672 | static void ops_run_biofill(struct stripe_head *sh) | |
673 | { | |
674 | struct dma_async_tx_descriptor *tx = NULL; | |
675 | raid5_conf_t *conf = sh->raid_conf; | |
a08abd8c | 676 | struct async_submit_ctl submit; |
91c00924 DW |
677 | int i; |
678 | ||
e46b272b | 679 | pr_debug("%s: stripe %llu\n", __func__, |
91c00924 DW |
680 | (unsigned long long)sh->sector); |
681 | ||
682 | for (i = sh->disks; i--; ) { | |
683 | struct r5dev *dev = &sh->dev[i]; | |
684 | if (test_bit(R5_Wantfill, &dev->flags)) { | |
685 | struct bio *rbi; | |
686 | spin_lock_irq(&conf->device_lock); | |
687 | dev->read = rbi = dev->toread; | |
688 | dev->toread = NULL; | |
689 | spin_unlock_irq(&conf->device_lock); | |
690 | while (rbi && rbi->bi_sector < | |
691 | dev->sector + STRIPE_SECTORS) { | |
692 | tx = async_copy_data(0, rbi, dev->page, | |
693 | dev->sector, tx); | |
694 | rbi = r5_next_bio(rbi, dev->sector); | |
695 | } | |
696 | } | |
697 | } | |
698 | ||
699 | atomic_inc(&sh->count); | |
a08abd8c DW |
700 | init_async_submit(&submit, ASYNC_TX_ACK, tx, ops_complete_biofill, sh, NULL); |
701 | async_trigger_callback(&submit); | |
91c00924 DW |
702 | } |
703 | ||
4e7d2c0a | 704 | static void mark_target_uptodate(struct stripe_head *sh, int target) |
91c00924 | 705 | { |
4e7d2c0a | 706 | struct r5dev *tgt; |
91c00924 | 707 | |
4e7d2c0a DW |
708 | if (target < 0) |
709 | return; | |
91c00924 | 710 | |
4e7d2c0a | 711 | tgt = &sh->dev[target]; |
91c00924 DW |
712 | set_bit(R5_UPTODATE, &tgt->flags); |
713 | BUG_ON(!test_bit(R5_Wantcompute, &tgt->flags)); | |
714 | clear_bit(R5_Wantcompute, &tgt->flags); | |
4e7d2c0a DW |
715 | } |
716 | ||
ac6b53b6 | 717 | static void ops_complete_compute(void *stripe_head_ref) |
91c00924 DW |
718 | { |
719 | struct stripe_head *sh = stripe_head_ref; | |
91c00924 | 720 | |
e46b272b | 721 | pr_debug("%s: stripe %llu\n", __func__, |
91c00924 DW |
722 | (unsigned long long)sh->sector); |
723 | ||
ac6b53b6 | 724 | /* mark the computed target(s) as uptodate */ |
4e7d2c0a | 725 | mark_target_uptodate(sh, sh->ops.target); |
ac6b53b6 | 726 | mark_target_uptodate(sh, sh->ops.target2); |
4e7d2c0a | 727 | |
ecc65c9b DW |
728 | clear_bit(STRIPE_COMPUTE_RUN, &sh->state); |
729 | if (sh->check_state == check_state_compute_run) | |
730 | sh->check_state = check_state_compute_result; | |
91c00924 DW |
731 | set_bit(STRIPE_HANDLE, &sh->state); |
732 | release_stripe(sh); | |
733 | } | |
734 | ||
d6f38f31 DW |
735 | /* return a pointer to the address conversion region of the scribble buffer */ |
736 | static addr_conv_t *to_addr_conv(struct stripe_head *sh, | |
737 | struct raid5_percpu *percpu) | |
738 | { | |
739 | return percpu->scribble + sizeof(struct page *) * (sh->disks + 2); | |
740 | } | |
741 | ||
742 | static struct dma_async_tx_descriptor * | |
743 | ops_run_compute5(struct stripe_head *sh, struct raid5_percpu *percpu) | |
91c00924 | 744 | { |
91c00924 | 745 | int disks = sh->disks; |
d6f38f31 | 746 | struct page **xor_srcs = percpu->scribble; |
91c00924 DW |
747 | int target = sh->ops.target; |
748 | struct r5dev *tgt = &sh->dev[target]; | |
749 | struct page *xor_dest = tgt->page; | |
750 | int count = 0; | |
751 | struct dma_async_tx_descriptor *tx; | |
a08abd8c | 752 | struct async_submit_ctl submit; |
91c00924 DW |
753 | int i; |
754 | ||
755 | pr_debug("%s: stripe %llu block: %d\n", | |
e46b272b | 756 | __func__, (unsigned long long)sh->sector, target); |
91c00924 DW |
757 | BUG_ON(!test_bit(R5_Wantcompute, &tgt->flags)); |
758 | ||
759 | for (i = disks; i--; ) | |
760 | if (i != target) | |
761 | xor_srcs[count++] = sh->dev[i].page; | |
762 | ||
763 | atomic_inc(&sh->count); | |
764 | ||
0403e382 | 765 | init_async_submit(&submit, ASYNC_TX_FENCE|ASYNC_TX_XOR_ZERO_DST, NULL, |
ac6b53b6 | 766 | ops_complete_compute, sh, to_addr_conv(sh, percpu)); |
91c00924 | 767 | if (unlikely(count == 1)) |
a08abd8c | 768 | tx = async_memcpy(xor_dest, xor_srcs[0], 0, 0, STRIPE_SIZE, &submit); |
91c00924 | 769 | else |
a08abd8c | 770 | tx = async_xor(xor_dest, xor_srcs, 0, count, STRIPE_SIZE, &submit); |
91c00924 | 771 | |
91c00924 DW |
772 | return tx; |
773 | } | |
774 | ||
ac6b53b6 DW |
775 | /* set_syndrome_sources - populate source buffers for gen_syndrome |
776 | * @srcs - (struct page *) array of size sh->disks | |
777 | * @sh - stripe_head to parse | |
778 | * | |
779 | * Populates srcs in proper layout order for the stripe and returns the | |
780 | * 'count' of sources to be used in a call to async_gen_syndrome. The P | |
781 | * destination buffer is recorded in srcs[count] and the Q destination | |
782 | * is recorded in srcs[count+1]]. | |
783 | */ | |
784 | static int set_syndrome_sources(struct page **srcs, struct stripe_head *sh) | |
785 | { | |
786 | int disks = sh->disks; | |
787 | int syndrome_disks = sh->ddf_layout ? disks : (disks - 2); | |
788 | int d0_idx = raid6_d0(sh); | |
789 | int count; | |
790 | int i; | |
791 | ||
792 | for (i = 0; i < disks; i++) | |
5dd33c9a | 793 | srcs[i] = NULL; |
ac6b53b6 DW |
794 | |
795 | count = 0; | |
796 | i = d0_idx; | |
797 | do { | |
798 | int slot = raid6_idx_to_slot(i, sh, &count, syndrome_disks); | |
799 | ||
800 | srcs[slot] = sh->dev[i].page; | |
801 | i = raid6_next_disk(i, disks); | |
802 | } while (i != d0_idx); | |
ac6b53b6 | 803 | |
e4424fee | 804 | return syndrome_disks; |
ac6b53b6 DW |
805 | } |
806 | ||
807 | static struct dma_async_tx_descriptor * | |
808 | ops_run_compute6_1(struct stripe_head *sh, struct raid5_percpu *percpu) | |
809 | { | |
810 | int disks = sh->disks; | |
811 | struct page **blocks = percpu->scribble; | |
812 | int target; | |
813 | int qd_idx = sh->qd_idx; | |
814 | struct dma_async_tx_descriptor *tx; | |
815 | struct async_submit_ctl submit; | |
816 | struct r5dev *tgt; | |
817 | struct page *dest; | |
818 | int i; | |
819 | int count; | |
820 | ||
821 | if (sh->ops.target < 0) | |
822 | target = sh->ops.target2; | |
823 | else if (sh->ops.target2 < 0) | |
824 | target = sh->ops.target; | |
91c00924 | 825 | else |
ac6b53b6 DW |
826 | /* we should only have one valid target */ |
827 | BUG(); | |
828 | BUG_ON(target < 0); | |
829 | pr_debug("%s: stripe %llu block: %d\n", | |
830 | __func__, (unsigned long long)sh->sector, target); | |
831 | ||
832 | tgt = &sh->dev[target]; | |
833 | BUG_ON(!test_bit(R5_Wantcompute, &tgt->flags)); | |
834 | dest = tgt->page; | |
835 | ||
836 | atomic_inc(&sh->count); | |
837 | ||
838 | if (target == qd_idx) { | |
839 | count = set_syndrome_sources(blocks, sh); | |
840 | blocks[count] = NULL; /* regenerating p is not necessary */ | |
841 | BUG_ON(blocks[count+1] != dest); /* q should already be set */ | |
0403e382 DW |
842 | init_async_submit(&submit, ASYNC_TX_FENCE, NULL, |
843 | ops_complete_compute, sh, | |
ac6b53b6 DW |
844 | to_addr_conv(sh, percpu)); |
845 | tx = async_gen_syndrome(blocks, 0, count+2, STRIPE_SIZE, &submit); | |
846 | } else { | |
847 | /* Compute any data- or p-drive using XOR */ | |
848 | count = 0; | |
849 | for (i = disks; i-- ; ) { | |
850 | if (i == target || i == qd_idx) | |
851 | continue; | |
852 | blocks[count++] = sh->dev[i].page; | |
853 | } | |
854 | ||
0403e382 DW |
855 | init_async_submit(&submit, ASYNC_TX_FENCE|ASYNC_TX_XOR_ZERO_DST, |
856 | NULL, ops_complete_compute, sh, | |
ac6b53b6 DW |
857 | to_addr_conv(sh, percpu)); |
858 | tx = async_xor(dest, blocks, 0, count, STRIPE_SIZE, &submit); | |
859 | } | |
91c00924 | 860 | |
91c00924 DW |
861 | return tx; |
862 | } | |
863 | ||
ac6b53b6 DW |
864 | static struct dma_async_tx_descriptor * |
865 | ops_run_compute6_2(struct stripe_head *sh, struct raid5_percpu *percpu) | |
866 | { | |
867 | int i, count, disks = sh->disks; | |
868 | int syndrome_disks = sh->ddf_layout ? disks : disks-2; | |
869 | int d0_idx = raid6_d0(sh); | |
870 | int faila = -1, failb = -1; | |
871 | int target = sh->ops.target; | |
872 | int target2 = sh->ops.target2; | |
873 | struct r5dev *tgt = &sh->dev[target]; | |
874 | struct r5dev *tgt2 = &sh->dev[target2]; | |
875 | struct dma_async_tx_descriptor *tx; | |
876 | struct page **blocks = percpu->scribble; | |
877 | struct async_submit_ctl submit; | |
878 | ||
879 | pr_debug("%s: stripe %llu block1: %d block2: %d\n", | |
880 | __func__, (unsigned long long)sh->sector, target, target2); | |
881 | BUG_ON(target < 0 || target2 < 0); | |
882 | BUG_ON(!test_bit(R5_Wantcompute, &tgt->flags)); | |
883 | BUG_ON(!test_bit(R5_Wantcompute, &tgt2->flags)); | |
884 | ||
6c910a78 | 885 | /* we need to open-code set_syndrome_sources to handle the |
ac6b53b6 DW |
886 | * slot number conversion for 'faila' and 'failb' |
887 | */ | |
888 | for (i = 0; i < disks ; i++) | |
5dd33c9a | 889 | blocks[i] = NULL; |
ac6b53b6 DW |
890 | count = 0; |
891 | i = d0_idx; | |
892 | do { | |
893 | int slot = raid6_idx_to_slot(i, sh, &count, syndrome_disks); | |
894 | ||
895 | blocks[slot] = sh->dev[i].page; | |
896 | ||
897 | if (i == target) | |
898 | faila = slot; | |
899 | if (i == target2) | |
900 | failb = slot; | |
901 | i = raid6_next_disk(i, disks); | |
902 | } while (i != d0_idx); | |
ac6b53b6 DW |
903 | |
904 | BUG_ON(faila == failb); | |
905 | if (failb < faila) | |
906 | swap(faila, failb); | |
907 | pr_debug("%s: stripe: %llu faila: %d failb: %d\n", | |
908 | __func__, (unsigned long long)sh->sector, faila, failb); | |
909 | ||
910 | atomic_inc(&sh->count); | |
911 | ||
912 | if (failb == syndrome_disks+1) { | |
913 | /* Q disk is one of the missing disks */ | |
914 | if (faila == syndrome_disks) { | |
915 | /* Missing P+Q, just recompute */ | |
0403e382 DW |
916 | init_async_submit(&submit, ASYNC_TX_FENCE, NULL, |
917 | ops_complete_compute, sh, | |
918 | to_addr_conv(sh, percpu)); | |
e4424fee | 919 | return async_gen_syndrome(blocks, 0, syndrome_disks+2, |
ac6b53b6 DW |
920 | STRIPE_SIZE, &submit); |
921 | } else { | |
922 | struct page *dest; | |
923 | int data_target; | |
924 | int qd_idx = sh->qd_idx; | |
925 | ||
926 | /* Missing D+Q: recompute D from P, then recompute Q */ | |
927 | if (target == qd_idx) | |
928 | data_target = target2; | |
929 | else | |
930 | data_target = target; | |
931 | ||
932 | count = 0; | |
933 | for (i = disks; i-- ; ) { | |
934 | if (i == data_target || i == qd_idx) | |
935 | continue; | |
936 | blocks[count++] = sh->dev[i].page; | |
937 | } | |
938 | dest = sh->dev[data_target].page; | |
0403e382 DW |
939 | init_async_submit(&submit, |
940 | ASYNC_TX_FENCE|ASYNC_TX_XOR_ZERO_DST, | |
941 | NULL, NULL, NULL, | |
942 | to_addr_conv(sh, percpu)); | |
ac6b53b6 DW |
943 | tx = async_xor(dest, blocks, 0, count, STRIPE_SIZE, |
944 | &submit); | |
945 | ||
946 | count = set_syndrome_sources(blocks, sh); | |
0403e382 DW |
947 | init_async_submit(&submit, ASYNC_TX_FENCE, tx, |
948 | ops_complete_compute, sh, | |
949 | to_addr_conv(sh, percpu)); | |
ac6b53b6 DW |
950 | return async_gen_syndrome(blocks, 0, count+2, |
951 | STRIPE_SIZE, &submit); | |
952 | } | |
ac6b53b6 | 953 | } else { |
6c910a78 DW |
954 | init_async_submit(&submit, ASYNC_TX_FENCE, NULL, |
955 | ops_complete_compute, sh, | |
956 | to_addr_conv(sh, percpu)); | |
957 | if (failb == syndrome_disks) { | |
958 | /* We're missing D+P. */ | |
959 | return async_raid6_datap_recov(syndrome_disks+2, | |
960 | STRIPE_SIZE, faila, | |
961 | blocks, &submit); | |
962 | } else { | |
963 | /* We're missing D+D. */ | |
964 | return async_raid6_2data_recov(syndrome_disks+2, | |
965 | STRIPE_SIZE, faila, failb, | |
966 | blocks, &submit); | |
967 | } | |
ac6b53b6 DW |
968 | } |
969 | } | |
970 | ||
971 | ||
91c00924 DW |
972 | static void ops_complete_prexor(void *stripe_head_ref) |
973 | { | |
974 | struct stripe_head *sh = stripe_head_ref; | |
975 | ||
e46b272b | 976 | pr_debug("%s: stripe %llu\n", __func__, |
91c00924 | 977 | (unsigned long long)sh->sector); |
91c00924 DW |
978 | } |
979 | ||
980 | static struct dma_async_tx_descriptor * | |
d6f38f31 DW |
981 | ops_run_prexor(struct stripe_head *sh, struct raid5_percpu *percpu, |
982 | struct dma_async_tx_descriptor *tx) | |
91c00924 | 983 | { |
91c00924 | 984 | int disks = sh->disks; |
d6f38f31 | 985 | struct page **xor_srcs = percpu->scribble; |
91c00924 | 986 | int count = 0, pd_idx = sh->pd_idx, i; |
a08abd8c | 987 | struct async_submit_ctl submit; |
91c00924 DW |
988 | |
989 | /* existing parity data subtracted */ | |
990 | struct page *xor_dest = xor_srcs[count++] = sh->dev[pd_idx].page; | |
991 | ||
e46b272b | 992 | pr_debug("%s: stripe %llu\n", __func__, |
91c00924 DW |
993 | (unsigned long long)sh->sector); |
994 | ||
995 | for (i = disks; i--; ) { | |
996 | struct r5dev *dev = &sh->dev[i]; | |
997 | /* Only process blocks that are known to be uptodate */ | |
d8ee0728 | 998 | if (test_bit(R5_Wantdrain, &dev->flags)) |
91c00924 DW |
999 | xor_srcs[count++] = dev->page; |
1000 | } | |
1001 | ||
0403e382 | 1002 | init_async_submit(&submit, ASYNC_TX_FENCE|ASYNC_TX_XOR_DROP_DST, tx, |
d6f38f31 | 1003 | ops_complete_prexor, sh, to_addr_conv(sh, percpu)); |
a08abd8c | 1004 | tx = async_xor(xor_dest, xor_srcs, 0, count, STRIPE_SIZE, &submit); |
91c00924 DW |
1005 | |
1006 | return tx; | |
1007 | } | |
1008 | ||
1009 | static struct dma_async_tx_descriptor * | |
d8ee0728 | 1010 | ops_run_biodrain(struct stripe_head *sh, struct dma_async_tx_descriptor *tx) |
91c00924 DW |
1011 | { |
1012 | int disks = sh->disks; | |
d8ee0728 | 1013 | int i; |
91c00924 | 1014 | |
e46b272b | 1015 | pr_debug("%s: stripe %llu\n", __func__, |
91c00924 DW |
1016 | (unsigned long long)sh->sector); |
1017 | ||
1018 | for (i = disks; i--; ) { | |
1019 | struct r5dev *dev = &sh->dev[i]; | |
1020 | struct bio *chosen; | |
91c00924 | 1021 | |
d8ee0728 | 1022 | if (test_and_clear_bit(R5_Wantdrain, &dev->flags)) { |
91c00924 DW |
1023 | struct bio *wbi; |
1024 | ||
1025 | spin_lock(&sh->lock); | |
1026 | chosen = dev->towrite; | |
1027 | dev->towrite = NULL; | |
1028 | BUG_ON(dev->written); | |
1029 | wbi = dev->written = chosen; | |
1030 | spin_unlock(&sh->lock); | |
1031 | ||
1032 | while (wbi && wbi->bi_sector < | |
1033 | dev->sector + STRIPE_SECTORS) { | |
1034 | tx = async_copy_data(1, wbi, dev->page, | |
1035 | dev->sector, tx); | |
1036 | wbi = r5_next_bio(wbi, dev->sector); | |
1037 | } | |
1038 | } | |
1039 | } | |
1040 | ||
1041 | return tx; | |
1042 | } | |
1043 | ||
ac6b53b6 | 1044 | static void ops_complete_reconstruct(void *stripe_head_ref) |
91c00924 DW |
1045 | { |
1046 | struct stripe_head *sh = stripe_head_ref; | |
ac6b53b6 DW |
1047 | int disks = sh->disks; |
1048 | int pd_idx = sh->pd_idx; | |
1049 | int qd_idx = sh->qd_idx; | |
1050 | int i; | |
91c00924 | 1051 | |
e46b272b | 1052 | pr_debug("%s: stripe %llu\n", __func__, |
91c00924 DW |
1053 | (unsigned long long)sh->sector); |
1054 | ||
1055 | for (i = disks; i--; ) { | |
1056 | struct r5dev *dev = &sh->dev[i]; | |
ac6b53b6 DW |
1057 | |
1058 | if (dev->written || i == pd_idx || i == qd_idx) | |
91c00924 DW |
1059 | set_bit(R5_UPTODATE, &dev->flags); |
1060 | } | |
1061 | ||
d8ee0728 DW |
1062 | if (sh->reconstruct_state == reconstruct_state_drain_run) |
1063 | sh->reconstruct_state = reconstruct_state_drain_result; | |
1064 | else if (sh->reconstruct_state == reconstruct_state_prexor_drain_run) | |
1065 | sh->reconstruct_state = reconstruct_state_prexor_drain_result; | |
1066 | else { | |
1067 | BUG_ON(sh->reconstruct_state != reconstruct_state_run); | |
1068 | sh->reconstruct_state = reconstruct_state_result; | |
1069 | } | |
91c00924 DW |
1070 | |
1071 | set_bit(STRIPE_HANDLE, &sh->state); | |
1072 | release_stripe(sh); | |
1073 | } | |
1074 | ||
1075 | static void | |
ac6b53b6 DW |
1076 | ops_run_reconstruct5(struct stripe_head *sh, struct raid5_percpu *percpu, |
1077 | struct dma_async_tx_descriptor *tx) | |
91c00924 | 1078 | { |
91c00924 | 1079 | int disks = sh->disks; |
d6f38f31 | 1080 | struct page **xor_srcs = percpu->scribble; |
a08abd8c | 1081 | struct async_submit_ctl submit; |
91c00924 DW |
1082 | int count = 0, pd_idx = sh->pd_idx, i; |
1083 | struct page *xor_dest; | |
d8ee0728 | 1084 | int prexor = 0; |
91c00924 | 1085 | unsigned long flags; |
91c00924 | 1086 | |
e46b272b | 1087 | pr_debug("%s: stripe %llu\n", __func__, |
91c00924 DW |
1088 | (unsigned long long)sh->sector); |
1089 | ||
1090 | /* check if prexor is active which means only process blocks | |
1091 | * that are part of a read-modify-write (written) | |
1092 | */ | |
d8ee0728 DW |
1093 | if (sh->reconstruct_state == reconstruct_state_prexor_drain_run) { |
1094 | prexor = 1; | |
91c00924 DW |
1095 | xor_dest = xor_srcs[count++] = sh->dev[pd_idx].page; |
1096 | for (i = disks; i--; ) { | |
1097 | struct r5dev *dev = &sh->dev[i]; | |
1098 | if (dev->written) | |
1099 | xor_srcs[count++] = dev->page; | |
1100 | } | |
1101 | } else { | |
1102 | xor_dest = sh->dev[pd_idx].page; | |
1103 | for (i = disks; i--; ) { | |
1104 | struct r5dev *dev = &sh->dev[i]; | |
1105 | if (i != pd_idx) | |
1106 | xor_srcs[count++] = dev->page; | |
1107 | } | |
1108 | } | |
1109 | ||
91c00924 DW |
1110 | /* 1/ if we prexor'd then the dest is reused as a source |
1111 | * 2/ if we did not prexor then we are redoing the parity | |
1112 | * set ASYNC_TX_XOR_DROP_DST and ASYNC_TX_XOR_ZERO_DST | |
1113 | * for the synchronous xor case | |
1114 | */ | |
88ba2aa5 | 1115 | flags = ASYNC_TX_ACK | |
91c00924 DW |
1116 | (prexor ? ASYNC_TX_XOR_DROP_DST : ASYNC_TX_XOR_ZERO_DST); |
1117 | ||
1118 | atomic_inc(&sh->count); | |
1119 | ||
ac6b53b6 | 1120 | init_async_submit(&submit, flags, tx, ops_complete_reconstruct, sh, |
d6f38f31 | 1121 | to_addr_conv(sh, percpu)); |
a08abd8c DW |
1122 | if (unlikely(count == 1)) |
1123 | tx = async_memcpy(xor_dest, xor_srcs[0], 0, 0, STRIPE_SIZE, &submit); | |
1124 | else | |
1125 | tx = async_xor(xor_dest, xor_srcs, 0, count, STRIPE_SIZE, &submit); | |
91c00924 DW |
1126 | } |
1127 | ||
ac6b53b6 DW |
1128 | static void |
1129 | ops_run_reconstruct6(struct stripe_head *sh, struct raid5_percpu *percpu, | |
1130 | struct dma_async_tx_descriptor *tx) | |
1131 | { | |
1132 | struct async_submit_ctl submit; | |
1133 | struct page **blocks = percpu->scribble; | |
1134 | int count; | |
1135 | ||
1136 | pr_debug("%s: stripe %llu\n", __func__, (unsigned long long)sh->sector); | |
1137 | ||
1138 | count = set_syndrome_sources(blocks, sh); | |
1139 | ||
1140 | atomic_inc(&sh->count); | |
1141 | ||
1142 | init_async_submit(&submit, ASYNC_TX_ACK, tx, ops_complete_reconstruct, | |
1143 | sh, to_addr_conv(sh, percpu)); | |
1144 | async_gen_syndrome(blocks, 0, count+2, STRIPE_SIZE, &submit); | |
91c00924 DW |
1145 | } |
1146 | ||
1147 | static void ops_complete_check(void *stripe_head_ref) | |
1148 | { | |
1149 | struct stripe_head *sh = stripe_head_ref; | |
91c00924 | 1150 | |
e46b272b | 1151 | pr_debug("%s: stripe %llu\n", __func__, |
91c00924 DW |
1152 | (unsigned long long)sh->sector); |
1153 | ||
ecc65c9b | 1154 | sh->check_state = check_state_check_result; |
91c00924 DW |
1155 | set_bit(STRIPE_HANDLE, &sh->state); |
1156 | release_stripe(sh); | |
1157 | } | |
1158 | ||
ac6b53b6 | 1159 | static void ops_run_check_p(struct stripe_head *sh, struct raid5_percpu *percpu) |
91c00924 | 1160 | { |
91c00924 | 1161 | int disks = sh->disks; |
ac6b53b6 DW |
1162 | int pd_idx = sh->pd_idx; |
1163 | int qd_idx = sh->qd_idx; | |
1164 | struct page *xor_dest; | |
d6f38f31 | 1165 | struct page **xor_srcs = percpu->scribble; |
91c00924 | 1166 | struct dma_async_tx_descriptor *tx; |
a08abd8c | 1167 | struct async_submit_ctl submit; |
ac6b53b6 DW |
1168 | int count; |
1169 | int i; | |
91c00924 | 1170 | |
e46b272b | 1171 | pr_debug("%s: stripe %llu\n", __func__, |
91c00924 DW |
1172 | (unsigned long long)sh->sector); |
1173 | ||
ac6b53b6 DW |
1174 | count = 0; |
1175 | xor_dest = sh->dev[pd_idx].page; | |
1176 | xor_srcs[count++] = xor_dest; | |
91c00924 | 1177 | for (i = disks; i--; ) { |
ac6b53b6 DW |
1178 | if (i == pd_idx || i == qd_idx) |
1179 | continue; | |
1180 | xor_srcs[count++] = sh->dev[i].page; | |
91c00924 DW |
1181 | } |
1182 | ||
d6f38f31 DW |
1183 | init_async_submit(&submit, 0, NULL, NULL, NULL, |
1184 | to_addr_conv(sh, percpu)); | |
099f53cb | 1185 | tx = async_xor_val(xor_dest, xor_srcs, 0, count, STRIPE_SIZE, |
a08abd8c | 1186 | &sh->ops.zero_sum_result, &submit); |
91c00924 | 1187 | |
91c00924 | 1188 | atomic_inc(&sh->count); |
a08abd8c DW |
1189 | init_async_submit(&submit, ASYNC_TX_ACK, tx, ops_complete_check, sh, NULL); |
1190 | tx = async_trigger_callback(&submit); | |
91c00924 DW |
1191 | } |
1192 | ||
ac6b53b6 DW |
1193 | static void ops_run_check_pq(struct stripe_head *sh, struct raid5_percpu *percpu, int checkp) |
1194 | { | |
1195 | struct page **srcs = percpu->scribble; | |
1196 | struct async_submit_ctl submit; | |
1197 | int count; | |
1198 | ||
1199 | pr_debug("%s: stripe %llu checkp: %d\n", __func__, | |
1200 | (unsigned long long)sh->sector, checkp); | |
1201 | ||
1202 | count = set_syndrome_sources(srcs, sh); | |
1203 | if (!checkp) | |
1204 | srcs[count] = NULL; | |
91c00924 | 1205 | |
91c00924 | 1206 | atomic_inc(&sh->count); |
ac6b53b6 DW |
1207 | init_async_submit(&submit, ASYNC_TX_ACK, NULL, ops_complete_check, |
1208 | sh, to_addr_conv(sh, percpu)); | |
1209 | async_syndrome_val(srcs, 0, count+2, STRIPE_SIZE, | |
1210 | &sh->ops.zero_sum_result, percpu->spare_page, &submit); | |
91c00924 DW |
1211 | } |
1212 | ||
417b8d4a | 1213 | static void __raid_run_ops(struct stripe_head *sh, unsigned long ops_request) |
91c00924 DW |
1214 | { |
1215 | int overlap_clear = 0, i, disks = sh->disks; | |
1216 | struct dma_async_tx_descriptor *tx = NULL; | |
d6f38f31 | 1217 | raid5_conf_t *conf = sh->raid_conf; |
ac6b53b6 | 1218 | int level = conf->level; |
d6f38f31 DW |
1219 | struct raid5_percpu *percpu; |
1220 | unsigned long cpu; | |
91c00924 | 1221 | |
d6f38f31 DW |
1222 | cpu = get_cpu(); |
1223 | percpu = per_cpu_ptr(conf->percpu, cpu); | |
83de75cc | 1224 | if (test_bit(STRIPE_OP_BIOFILL, &ops_request)) { |
91c00924 DW |
1225 | ops_run_biofill(sh); |
1226 | overlap_clear++; | |
1227 | } | |
1228 | ||
7b3a871e | 1229 | if (test_bit(STRIPE_OP_COMPUTE_BLK, &ops_request)) { |
ac6b53b6 DW |
1230 | if (level < 6) |
1231 | tx = ops_run_compute5(sh, percpu); | |
1232 | else { | |
1233 | if (sh->ops.target2 < 0 || sh->ops.target < 0) | |
1234 | tx = ops_run_compute6_1(sh, percpu); | |
1235 | else | |
1236 | tx = ops_run_compute6_2(sh, percpu); | |
1237 | } | |
1238 | /* terminate the chain if reconstruct is not set to be run */ | |
1239 | if (tx && !test_bit(STRIPE_OP_RECONSTRUCT, &ops_request)) | |
7b3a871e DW |
1240 | async_tx_ack(tx); |
1241 | } | |
91c00924 | 1242 | |
600aa109 | 1243 | if (test_bit(STRIPE_OP_PREXOR, &ops_request)) |
d6f38f31 | 1244 | tx = ops_run_prexor(sh, percpu, tx); |
91c00924 | 1245 | |
600aa109 | 1246 | if (test_bit(STRIPE_OP_BIODRAIN, &ops_request)) { |
d8ee0728 | 1247 | tx = ops_run_biodrain(sh, tx); |
91c00924 DW |
1248 | overlap_clear++; |
1249 | } | |
1250 | ||
ac6b53b6 DW |
1251 | if (test_bit(STRIPE_OP_RECONSTRUCT, &ops_request)) { |
1252 | if (level < 6) | |
1253 | ops_run_reconstruct5(sh, percpu, tx); | |
1254 | else | |
1255 | ops_run_reconstruct6(sh, percpu, tx); | |
1256 | } | |
91c00924 | 1257 | |
ac6b53b6 DW |
1258 | if (test_bit(STRIPE_OP_CHECK, &ops_request)) { |
1259 | if (sh->check_state == check_state_run) | |
1260 | ops_run_check_p(sh, percpu); | |
1261 | else if (sh->check_state == check_state_run_q) | |
1262 | ops_run_check_pq(sh, percpu, 0); | |
1263 | else if (sh->check_state == check_state_run_pq) | |
1264 | ops_run_check_pq(sh, percpu, 1); | |
1265 | else | |
1266 | BUG(); | |
1267 | } | |
91c00924 | 1268 | |
91c00924 DW |
1269 | if (overlap_clear) |
1270 | for (i = disks; i--; ) { | |
1271 | struct r5dev *dev = &sh->dev[i]; | |
1272 | if (test_and_clear_bit(R5_Overlap, &dev->flags)) | |
1273 | wake_up(&sh->raid_conf->wait_for_overlap); | |
1274 | } | |
d6f38f31 | 1275 | put_cpu(); |
91c00924 DW |
1276 | } |
1277 | ||
417b8d4a DW |
1278 | #ifdef CONFIG_MULTICORE_RAID456 |
1279 | static void async_run_ops(void *param, async_cookie_t cookie) | |
1280 | { | |
1281 | struct stripe_head *sh = param; | |
1282 | unsigned long ops_request = sh->ops.request; | |
1283 | ||
1284 | clear_bit_unlock(STRIPE_OPS_REQ_PENDING, &sh->state); | |
1285 | wake_up(&sh->ops.wait_for_ops); | |
1286 | ||
1287 | __raid_run_ops(sh, ops_request); | |
1288 | release_stripe(sh); | |
1289 | } | |
1290 | ||
1291 | static void raid_run_ops(struct stripe_head *sh, unsigned long ops_request) | |
1292 | { | |
1293 | /* since handle_stripe can be called outside of raid5d context | |
1294 | * we need to ensure sh->ops.request is de-staged before another | |
1295 | * request arrives | |
1296 | */ | |
1297 | wait_event(sh->ops.wait_for_ops, | |
1298 | !test_and_set_bit_lock(STRIPE_OPS_REQ_PENDING, &sh->state)); | |
1299 | sh->ops.request = ops_request; | |
1300 | ||
1301 | atomic_inc(&sh->count); | |
1302 | async_schedule(async_run_ops, sh); | |
1303 | } | |
1304 | #else | |
1305 | #define raid_run_ops __raid_run_ops | |
1306 | #endif | |
1307 | ||
3f294f4f | 1308 | static int grow_one_stripe(raid5_conf_t *conf) |
1da177e4 LT |
1309 | { |
1310 | struct stripe_head *sh; | |
3f294f4f N |
1311 | sh = kmem_cache_alloc(conf->slab_cache, GFP_KERNEL); |
1312 | if (!sh) | |
1313 | return 0; | |
e4e11e38 | 1314 | memset(sh, 0, sizeof(*sh) + (conf->pool_size-1)*sizeof(struct r5dev)); |
3f294f4f N |
1315 | sh->raid_conf = conf; |
1316 | spin_lock_init(&sh->lock); | |
417b8d4a DW |
1317 | #ifdef CONFIG_MULTICORE_RAID456 |
1318 | init_waitqueue_head(&sh->ops.wait_for_ops); | |
1319 | #endif | |
3f294f4f | 1320 | |
e4e11e38 N |
1321 | if (grow_buffers(sh)) { |
1322 | shrink_buffers(sh); | |
3f294f4f N |
1323 | kmem_cache_free(conf->slab_cache, sh); |
1324 | return 0; | |
1325 | } | |
1326 | /* we just created an active stripe so... */ | |
1327 | atomic_set(&sh->count, 1); | |
1328 | atomic_inc(&conf->active_stripes); | |
1329 | INIT_LIST_HEAD(&sh->lru); | |
1330 | release_stripe(sh); | |
1331 | return 1; | |
1332 | } | |
1333 | ||
1334 | static int grow_stripes(raid5_conf_t *conf, int num) | |
1335 | { | |
e18b890b | 1336 | struct kmem_cache *sc; |
5e5e3e78 | 1337 | int devs = max(conf->raid_disks, conf->previous_raid_disks); |
1da177e4 | 1338 | |
f4be6b43 N |
1339 | if (conf->mddev->gendisk) |
1340 | sprintf(conf->cache_name[0], | |
1341 | "raid%d-%s", conf->level, mdname(conf->mddev)); | |
1342 | else | |
1343 | sprintf(conf->cache_name[0], | |
1344 | "raid%d-%p", conf->level, conf->mddev); | |
1345 | sprintf(conf->cache_name[1], "%s-alt", conf->cache_name[0]); | |
1346 | ||
ad01c9e3 N |
1347 | conf->active_name = 0; |
1348 | sc = kmem_cache_create(conf->cache_name[conf->active_name], | |
1da177e4 | 1349 | sizeof(struct stripe_head)+(devs-1)*sizeof(struct r5dev), |
20c2df83 | 1350 | 0, 0, NULL); |
1da177e4 LT |
1351 | if (!sc) |
1352 | return 1; | |
1353 | conf->slab_cache = sc; | |
ad01c9e3 | 1354 | conf->pool_size = devs; |
16a53ecc | 1355 | while (num--) |
3f294f4f | 1356 | if (!grow_one_stripe(conf)) |
1da177e4 | 1357 | return 1; |
1da177e4 LT |
1358 | return 0; |
1359 | } | |
29269553 | 1360 | |
d6f38f31 DW |
1361 | /** |
1362 | * scribble_len - return the required size of the scribble region | |
1363 | * @num - total number of disks in the array | |
1364 | * | |
1365 | * The size must be enough to contain: | |
1366 | * 1/ a struct page pointer for each device in the array +2 | |
1367 | * 2/ room to convert each entry in (1) to its corresponding dma | |
1368 | * (dma_map_page()) or page (page_address()) address. | |
1369 | * | |
1370 | * Note: the +2 is for the destination buffers of the ddf/raid6 case where we | |
1371 | * calculate over all devices (not just the data blocks), using zeros in place | |
1372 | * of the P and Q blocks. | |
1373 | */ | |
1374 | static size_t scribble_len(int num) | |
1375 | { | |
1376 | size_t len; | |
1377 | ||
1378 | len = sizeof(struct page *) * (num+2) + sizeof(addr_conv_t) * (num+2); | |
1379 | ||
1380 | return len; | |
1381 | } | |
1382 | ||
ad01c9e3 N |
1383 | static int resize_stripes(raid5_conf_t *conf, int newsize) |
1384 | { | |
1385 | /* Make all the stripes able to hold 'newsize' devices. | |
1386 | * New slots in each stripe get 'page' set to a new page. | |
1387 | * | |
1388 | * This happens in stages: | |
1389 | * 1/ create a new kmem_cache and allocate the required number of | |
1390 | * stripe_heads. | |
1391 | * 2/ gather all the old stripe_heads and tranfer the pages across | |
1392 | * to the new stripe_heads. This will have the side effect of | |
1393 | * freezing the array as once all stripe_heads have been collected, | |
1394 | * no IO will be possible. Old stripe heads are freed once their | |
1395 | * pages have been transferred over, and the old kmem_cache is | |
1396 | * freed when all stripes are done. | |
1397 | * 3/ reallocate conf->disks to be suitable bigger. If this fails, | |
1398 | * we simple return a failre status - no need to clean anything up. | |
1399 | * 4/ allocate new pages for the new slots in the new stripe_heads. | |
1400 | * If this fails, we don't bother trying the shrink the | |
1401 | * stripe_heads down again, we just leave them as they are. | |
1402 | * As each stripe_head is processed the new one is released into | |
1403 | * active service. | |
1404 | * | |
1405 | * Once step2 is started, we cannot afford to wait for a write, | |
1406 | * so we use GFP_NOIO allocations. | |
1407 | */ | |
1408 | struct stripe_head *osh, *nsh; | |
1409 | LIST_HEAD(newstripes); | |
1410 | struct disk_info *ndisks; | |
d6f38f31 | 1411 | unsigned long cpu; |
b5470dc5 | 1412 | int err; |
e18b890b | 1413 | struct kmem_cache *sc; |
ad01c9e3 N |
1414 | int i; |
1415 | ||
1416 | if (newsize <= conf->pool_size) | |
1417 | return 0; /* never bother to shrink */ | |
1418 | ||
b5470dc5 DW |
1419 | err = md_allow_write(conf->mddev); |
1420 | if (err) | |
1421 | return err; | |
2a2275d6 | 1422 | |
ad01c9e3 N |
1423 | /* Step 1 */ |
1424 | sc = kmem_cache_create(conf->cache_name[1-conf->active_name], | |
1425 | sizeof(struct stripe_head)+(newsize-1)*sizeof(struct r5dev), | |
20c2df83 | 1426 | 0, 0, NULL); |
ad01c9e3 N |
1427 | if (!sc) |
1428 | return -ENOMEM; | |
1429 | ||
1430 | for (i = conf->max_nr_stripes; i; i--) { | |
1431 | nsh = kmem_cache_alloc(sc, GFP_KERNEL); | |
1432 | if (!nsh) | |
1433 | break; | |
1434 | ||
1435 | memset(nsh, 0, sizeof(*nsh) + (newsize-1)*sizeof(struct r5dev)); | |
1436 | ||
1437 | nsh->raid_conf = conf; | |
1438 | spin_lock_init(&nsh->lock); | |
417b8d4a DW |
1439 | #ifdef CONFIG_MULTICORE_RAID456 |
1440 | init_waitqueue_head(&nsh->ops.wait_for_ops); | |
1441 | #endif | |
ad01c9e3 N |
1442 | |
1443 | list_add(&nsh->lru, &newstripes); | |
1444 | } | |
1445 | if (i) { | |
1446 | /* didn't get enough, give up */ | |
1447 | while (!list_empty(&newstripes)) { | |
1448 | nsh = list_entry(newstripes.next, struct stripe_head, lru); | |
1449 | list_del(&nsh->lru); | |
1450 | kmem_cache_free(sc, nsh); | |
1451 | } | |
1452 | kmem_cache_destroy(sc); | |
1453 | return -ENOMEM; | |
1454 | } | |
1455 | /* Step 2 - Must use GFP_NOIO now. | |
1456 | * OK, we have enough stripes, start collecting inactive | |
1457 | * stripes and copying them over | |
1458 | */ | |
1459 | list_for_each_entry(nsh, &newstripes, lru) { | |
1460 | spin_lock_irq(&conf->device_lock); | |
1461 | wait_event_lock_irq(conf->wait_for_stripe, | |
1462 | !list_empty(&conf->inactive_list), | |
1463 | conf->device_lock, | |
b3b46be3 | 1464 | unplug_slaves(conf->mddev) |
ad01c9e3 N |
1465 | ); |
1466 | osh = get_free_stripe(conf); | |
1467 | spin_unlock_irq(&conf->device_lock); | |
1468 | atomic_set(&nsh->count, 1); | |
1469 | for(i=0; i<conf->pool_size; i++) | |
1470 | nsh->dev[i].page = osh->dev[i].page; | |
1471 | for( ; i<newsize; i++) | |
1472 | nsh->dev[i].page = NULL; | |
1473 | kmem_cache_free(conf->slab_cache, osh); | |
1474 | } | |
1475 | kmem_cache_destroy(conf->slab_cache); | |
1476 | ||
1477 | /* Step 3. | |
1478 | * At this point, we are holding all the stripes so the array | |
1479 | * is completely stalled, so now is a good time to resize | |
d6f38f31 | 1480 | * conf->disks and the scribble region |
ad01c9e3 N |
1481 | */ |
1482 | ndisks = kzalloc(newsize * sizeof(struct disk_info), GFP_NOIO); | |
1483 | if (ndisks) { | |
1484 | for (i=0; i<conf->raid_disks; i++) | |
1485 | ndisks[i] = conf->disks[i]; | |
1486 | kfree(conf->disks); | |
1487 | conf->disks = ndisks; | |
1488 | } else | |
1489 | err = -ENOMEM; | |
1490 | ||
d6f38f31 DW |
1491 | get_online_cpus(); |
1492 | conf->scribble_len = scribble_len(newsize); | |
1493 | for_each_present_cpu(cpu) { | |
1494 | struct raid5_percpu *percpu; | |
1495 | void *scribble; | |
1496 | ||
1497 | percpu = per_cpu_ptr(conf->percpu, cpu); | |
1498 | scribble = kmalloc(conf->scribble_len, GFP_NOIO); | |
1499 | ||
1500 | if (scribble) { | |
1501 | kfree(percpu->scribble); | |
1502 | percpu->scribble = scribble; | |
1503 | } else { | |
1504 | err = -ENOMEM; | |
1505 | break; | |
1506 | } | |
1507 | } | |
1508 | put_online_cpus(); | |
1509 | ||
ad01c9e3 N |
1510 | /* Step 4, return new stripes to service */ |
1511 | while(!list_empty(&newstripes)) { | |
1512 | nsh = list_entry(newstripes.next, struct stripe_head, lru); | |
1513 | list_del_init(&nsh->lru); | |
d6f38f31 | 1514 | |
ad01c9e3 N |
1515 | for (i=conf->raid_disks; i < newsize; i++) |
1516 | if (nsh->dev[i].page == NULL) { | |
1517 | struct page *p = alloc_page(GFP_NOIO); | |
1518 | nsh->dev[i].page = p; | |
1519 | if (!p) | |
1520 | err = -ENOMEM; | |
1521 | } | |
1522 | release_stripe(nsh); | |
1523 | } | |
1524 | /* critical section pass, GFP_NOIO no longer needed */ | |
1525 | ||
1526 | conf->slab_cache = sc; | |
1527 | conf->active_name = 1-conf->active_name; | |
1528 | conf->pool_size = newsize; | |
1529 | return err; | |
1530 | } | |
1da177e4 | 1531 | |
3f294f4f | 1532 | static int drop_one_stripe(raid5_conf_t *conf) |
1da177e4 LT |
1533 | { |
1534 | struct stripe_head *sh; | |
1535 | ||
3f294f4f N |
1536 | spin_lock_irq(&conf->device_lock); |
1537 | sh = get_free_stripe(conf); | |
1538 | spin_unlock_irq(&conf->device_lock); | |
1539 | if (!sh) | |
1540 | return 0; | |
78bafebd | 1541 | BUG_ON(atomic_read(&sh->count)); |
e4e11e38 | 1542 | shrink_buffers(sh); |
3f294f4f N |
1543 | kmem_cache_free(conf->slab_cache, sh); |
1544 | atomic_dec(&conf->active_stripes); | |
1545 | return 1; | |
1546 | } | |
1547 | ||
1548 | static void shrink_stripes(raid5_conf_t *conf) | |
1549 | { | |
1550 | while (drop_one_stripe(conf)) | |
1551 | ; | |
1552 | ||
29fc7e3e N |
1553 | if (conf->slab_cache) |
1554 | kmem_cache_destroy(conf->slab_cache); | |
1da177e4 LT |
1555 | conf->slab_cache = NULL; |
1556 | } | |
1557 | ||
6712ecf8 | 1558 | static void raid5_end_read_request(struct bio * bi, int error) |
1da177e4 | 1559 | { |
99c0fb5f | 1560 | struct stripe_head *sh = bi->bi_private; |
1da177e4 | 1561 | raid5_conf_t *conf = sh->raid_conf; |
7ecaa1e6 | 1562 | int disks = sh->disks, i; |
1da177e4 | 1563 | int uptodate = test_bit(BIO_UPTODATE, &bi->bi_flags); |
d6950432 N |
1564 | char b[BDEVNAME_SIZE]; |
1565 | mdk_rdev_t *rdev; | |
1da177e4 | 1566 | |
1da177e4 LT |
1567 | |
1568 | for (i=0 ; i<disks; i++) | |
1569 | if (bi == &sh->dev[i].req) | |
1570 | break; | |
1571 | ||
45b4233c DW |
1572 | pr_debug("end_read_request %llu/%d, count: %d, uptodate %d.\n", |
1573 | (unsigned long long)sh->sector, i, atomic_read(&sh->count), | |
1da177e4 LT |
1574 | uptodate); |
1575 | if (i == disks) { | |
1576 | BUG(); | |
6712ecf8 | 1577 | return; |
1da177e4 LT |
1578 | } |
1579 | ||
1580 | if (uptodate) { | |
1da177e4 | 1581 | set_bit(R5_UPTODATE, &sh->dev[i].flags); |
4e5314b5 | 1582 | if (test_bit(R5_ReadError, &sh->dev[i].flags)) { |
d6950432 | 1583 | rdev = conf->disks[i].rdev; |
0c55e022 | 1584 | printk_rl(KERN_INFO "md/raid:%s: read error corrected" |
6be9d494 BS |
1585 | " (%lu sectors at %llu on %s)\n", |
1586 | mdname(conf->mddev), STRIPE_SECTORS, | |
1587 | (unsigned long long)(sh->sector | |
1588 | + rdev->data_offset), | |
1589 | bdevname(rdev->bdev, b)); | |
4e5314b5 N |
1590 | clear_bit(R5_ReadError, &sh->dev[i].flags); |
1591 | clear_bit(R5_ReWrite, &sh->dev[i].flags); | |
1592 | } | |
ba22dcbf N |
1593 | if (atomic_read(&conf->disks[i].rdev->read_errors)) |
1594 | atomic_set(&conf->disks[i].rdev->read_errors, 0); | |
1da177e4 | 1595 | } else { |
d6950432 | 1596 | const char *bdn = bdevname(conf->disks[i].rdev->bdev, b); |
ba22dcbf | 1597 | int retry = 0; |
d6950432 N |
1598 | rdev = conf->disks[i].rdev; |
1599 | ||
1da177e4 | 1600 | clear_bit(R5_UPTODATE, &sh->dev[i].flags); |
d6950432 | 1601 | atomic_inc(&rdev->read_errors); |
7b0bb536 | 1602 | if (conf->mddev->degraded >= conf->max_degraded) |
6be9d494 | 1603 | printk_rl(KERN_WARNING |
0c55e022 | 1604 | "md/raid:%s: read error not correctable " |
6be9d494 BS |
1605 | "(sector %llu on %s).\n", |
1606 | mdname(conf->mddev), | |
1607 | (unsigned long long)(sh->sector | |
1608 | + rdev->data_offset), | |
1609 | bdn); | |
ba22dcbf | 1610 | else if (test_bit(R5_ReWrite, &sh->dev[i].flags)) |
4e5314b5 | 1611 | /* Oh, no!!! */ |
6be9d494 | 1612 | printk_rl(KERN_WARNING |
0c55e022 | 1613 | "md/raid:%s: read error NOT corrected!! " |
6be9d494 BS |
1614 | "(sector %llu on %s).\n", |
1615 | mdname(conf->mddev), | |
1616 | (unsigned long long)(sh->sector | |
1617 | + rdev->data_offset), | |
1618 | bdn); | |
d6950432 | 1619 | else if (atomic_read(&rdev->read_errors) |
ba22dcbf | 1620 | > conf->max_nr_stripes) |
14f8d26b | 1621 | printk(KERN_WARNING |
0c55e022 | 1622 | "md/raid:%s: Too many read errors, failing device %s.\n", |
d6950432 | 1623 | mdname(conf->mddev), bdn); |
ba22dcbf N |
1624 | else |
1625 | retry = 1; | |
1626 | if (retry) | |
1627 | set_bit(R5_ReadError, &sh->dev[i].flags); | |
1628 | else { | |
4e5314b5 N |
1629 | clear_bit(R5_ReadError, &sh->dev[i].flags); |
1630 | clear_bit(R5_ReWrite, &sh->dev[i].flags); | |
d6950432 | 1631 | md_error(conf->mddev, rdev); |
ba22dcbf | 1632 | } |
1da177e4 LT |
1633 | } |
1634 | rdev_dec_pending(conf->disks[i].rdev, conf->mddev); | |
1da177e4 LT |
1635 | clear_bit(R5_LOCKED, &sh->dev[i].flags); |
1636 | set_bit(STRIPE_HANDLE, &sh->state); | |
1637 | release_stripe(sh); | |
1da177e4 LT |
1638 | } |
1639 | ||
d710e138 | 1640 | static void raid5_end_write_request(struct bio *bi, int error) |
1da177e4 | 1641 | { |
99c0fb5f | 1642 | struct stripe_head *sh = bi->bi_private; |
1da177e4 | 1643 | raid5_conf_t *conf = sh->raid_conf; |
7ecaa1e6 | 1644 | int disks = sh->disks, i; |
1da177e4 LT |
1645 | int uptodate = test_bit(BIO_UPTODATE, &bi->bi_flags); |
1646 | ||
1da177e4 LT |
1647 | for (i=0 ; i<disks; i++) |
1648 | if (bi == &sh->dev[i].req) | |
1649 | break; | |
1650 | ||
45b4233c | 1651 | pr_debug("end_write_request %llu/%d, count %d, uptodate: %d.\n", |
1da177e4 LT |
1652 | (unsigned long long)sh->sector, i, atomic_read(&sh->count), |
1653 | uptodate); | |
1654 | if (i == disks) { | |
1655 | BUG(); | |
6712ecf8 | 1656 | return; |
1da177e4 LT |
1657 | } |
1658 | ||
1da177e4 LT |
1659 | if (!uptodate) |
1660 | md_error(conf->mddev, conf->disks[i].rdev); | |
1661 | ||
1662 | rdev_dec_pending(conf->disks[i].rdev, conf->mddev); | |
1663 | ||
1664 | clear_bit(R5_LOCKED, &sh->dev[i].flags); | |
1665 | set_bit(STRIPE_HANDLE, &sh->state); | |
c04be0aa | 1666 | release_stripe(sh); |
1da177e4 LT |
1667 | } |
1668 | ||
1669 | ||
784052ec | 1670 | static sector_t compute_blocknr(struct stripe_head *sh, int i, int previous); |
1da177e4 | 1671 | |
784052ec | 1672 | static void raid5_build_block(struct stripe_head *sh, int i, int previous) |
1da177e4 LT |
1673 | { |
1674 | struct r5dev *dev = &sh->dev[i]; | |
1675 | ||
1676 | bio_init(&dev->req); | |
1677 | dev->req.bi_io_vec = &dev->vec; | |
1678 | dev->req.bi_vcnt++; | |
1679 | dev->req.bi_max_vecs++; | |
1680 | dev->vec.bv_page = dev->page; | |
1681 | dev->vec.bv_len = STRIPE_SIZE; | |
1682 | dev->vec.bv_offset = 0; | |
1683 | ||
1684 | dev->req.bi_sector = sh->sector; | |
1685 | dev->req.bi_private = sh; | |
1686 | ||
1687 | dev->flags = 0; | |
784052ec | 1688 | dev->sector = compute_blocknr(sh, i, previous); |
1da177e4 LT |
1689 | } |
1690 | ||
1691 | static void error(mddev_t *mddev, mdk_rdev_t *rdev) | |
1692 | { | |
1693 | char b[BDEVNAME_SIZE]; | |
7b92813c | 1694 | raid5_conf_t *conf = mddev->private; |
0c55e022 | 1695 | pr_debug("raid456: error called\n"); |
1da177e4 | 1696 | |
b2d444d7 | 1697 | if (!test_bit(Faulty, &rdev->flags)) { |
850b2b42 | 1698 | set_bit(MD_CHANGE_DEVS, &mddev->flags); |
c04be0aa N |
1699 | if (test_and_clear_bit(In_sync, &rdev->flags)) { |
1700 | unsigned long flags; | |
1701 | spin_lock_irqsave(&conf->device_lock, flags); | |
1da177e4 | 1702 | mddev->degraded++; |
c04be0aa | 1703 | spin_unlock_irqrestore(&conf->device_lock, flags); |
1da177e4 LT |
1704 | /* |
1705 | * if recovery was running, make sure it aborts. | |
1706 | */ | |
dfc70645 | 1707 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); |
1da177e4 | 1708 | } |
b2d444d7 | 1709 | set_bit(Faulty, &rdev->flags); |
d710e138 | 1710 | printk(KERN_ALERT |
0c55e022 N |
1711 | "md/raid:%s: Disk failure on %s, disabling device.\n" |
1712 | KERN_ALERT | |
1713 | "md/raid:%s: Operation continuing on %d devices.\n", | |
1714 | mdname(mddev), | |
1715 | bdevname(rdev->bdev, b), | |
1716 | mdname(mddev), | |
1717 | conf->raid_disks - mddev->degraded); | |
1da177e4 | 1718 | } |
16a53ecc | 1719 | } |
1da177e4 LT |
1720 | |
1721 | /* | |
1722 | * Input: a 'big' sector number, | |
1723 | * Output: index of the data and parity disk, and the sector # in them. | |
1724 | */ | |
112bf897 | 1725 | static sector_t raid5_compute_sector(raid5_conf_t *conf, sector_t r_sector, |
911d4ee8 N |
1726 | int previous, int *dd_idx, |
1727 | struct stripe_head *sh) | |
1da177e4 | 1728 | { |
6e3b96ed | 1729 | sector_t stripe, stripe2; |
35f2a591 | 1730 | sector_t chunk_number; |
1da177e4 | 1731 | unsigned int chunk_offset; |
911d4ee8 | 1732 | int pd_idx, qd_idx; |
67cc2b81 | 1733 | int ddf_layout = 0; |
1da177e4 | 1734 | sector_t new_sector; |
e183eaed N |
1735 | int algorithm = previous ? conf->prev_algo |
1736 | : conf->algorithm; | |
09c9e5fa AN |
1737 | int sectors_per_chunk = previous ? conf->prev_chunk_sectors |
1738 | : conf->chunk_sectors; | |
112bf897 N |
1739 | int raid_disks = previous ? conf->previous_raid_disks |
1740 | : conf->raid_disks; | |
1741 | int data_disks = raid_disks - conf->max_degraded; | |
1da177e4 LT |
1742 | |
1743 | /* First compute the information on this sector */ | |
1744 | ||
1745 | /* | |
1746 | * Compute the chunk number and the sector offset inside the chunk | |
1747 | */ | |
1748 | chunk_offset = sector_div(r_sector, sectors_per_chunk); | |
1749 | chunk_number = r_sector; | |
1da177e4 LT |
1750 | |
1751 | /* | |
1752 | * Compute the stripe number | |
1753 | */ | |
35f2a591 N |
1754 | stripe = chunk_number; |
1755 | *dd_idx = sector_div(stripe, data_disks); | |
6e3b96ed | 1756 | stripe2 = stripe; |
1da177e4 LT |
1757 | /* |
1758 | * Select the parity disk based on the user selected algorithm. | |
1759 | */ | |
911d4ee8 | 1760 | pd_idx = qd_idx = ~0; |
16a53ecc N |
1761 | switch(conf->level) { |
1762 | case 4: | |
911d4ee8 | 1763 | pd_idx = data_disks; |
16a53ecc N |
1764 | break; |
1765 | case 5: | |
e183eaed | 1766 | switch (algorithm) { |
1da177e4 | 1767 | case ALGORITHM_LEFT_ASYMMETRIC: |
6e3b96ed | 1768 | pd_idx = data_disks - sector_div(stripe2, raid_disks); |
911d4ee8 | 1769 | if (*dd_idx >= pd_idx) |
1da177e4 LT |
1770 | (*dd_idx)++; |
1771 | break; | |
1772 | case ALGORITHM_RIGHT_ASYMMETRIC: | |
6e3b96ed | 1773 | pd_idx = sector_div(stripe2, raid_disks); |
911d4ee8 | 1774 | if (*dd_idx >= pd_idx) |
1da177e4 LT |
1775 | (*dd_idx)++; |
1776 | break; | |
1777 | case ALGORITHM_LEFT_SYMMETRIC: | |
6e3b96ed | 1778 | pd_idx = data_disks - sector_div(stripe2, raid_disks); |
911d4ee8 | 1779 | *dd_idx = (pd_idx + 1 + *dd_idx) % raid_disks; |
1da177e4 LT |
1780 | break; |
1781 | case ALGORITHM_RIGHT_SYMMETRIC: | |
6e3b96ed | 1782 | pd_idx = sector_div(stripe2, raid_disks); |
911d4ee8 | 1783 | *dd_idx = (pd_idx + 1 + *dd_idx) % raid_disks; |
1da177e4 | 1784 | break; |
99c0fb5f N |
1785 | case ALGORITHM_PARITY_0: |
1786 | pd_idx = 0; | |
1787 | (*dd_idx)++; | |
1788 | break; | |
1789 | case ALGORITHM_PARITY_N: | |
1790 | pd_idx = data_disks; | |
1791 | break; | |
1da177e4 | 1792 | default: |
99c0fb5f | 1793 | BUG(); |
16a53ecc N |
1794 | } |
1795 | break; | |
1796 | case 6: | |
1797 | ||
e183eaed | 1798 | switch (algorithm) { |
16a53ecc | 1799 | case ALGORITHM_LEFT_ASYMMETRIC: |
6e3b96ed | 1800 | pd_idx = raid_disks - 1 - sector_div(stripe2, raid_disks); |
911d4ee8 N |
1801 | qd_idx = pd_idx + 1; |
1802 | if (pd_idx == raid_disks-1) { | |
99c0fb5f | 1803 | (*dd_idx)++; /* Q D D D P */ |
911d4ee8 N |
1804 | qd_idx = 0; |
1805 | } else if (*dd_idx >= pd_idx) | |
16a53ecc N |
1806 | (*dd_idx) += 2; /* D D P Q D */ |
1807 | break; | |
1808 | case ALGORITHM_RIGHT_ASYMMETRIC: | |
6e3b96ed | 1809 | pd_idx = sector_div(stripe2, raid_disks); |
911d4ee8 N |
1810 | qd_idx = pd_idx + 1; |
1811 | if (pd_idx == raid_disks-1) { | |
99c0fb5f | 1812 | (*dd_idx)++; /* Q D D D P */ |
911d4ee8 N |
1813 | qd_idx = 0; |
1814 | } else if (*dd_idx >= pd_idx) | |
16a53ecc N |
1815 | (*dd_idx) += 2; /* D D P Q D */ |
1816 | break; | |
1817 | case ALGORITHM_LEFT_SYMMETRIC: | |
6e3b96ed | 1818 | pd_idx = raid_disks - 1 - sector_div(stripe2, raid_disks); |
911d4ee8 N |
1819 | qd_idx = (pd_idx + 1) % raid_disks; |
1820 | *dd_idx = (pd_idx + 2 + *dd_idx) % raid_disks; | |
16a53ecc N |
1821 | break; |
1822 | case ALGORITHM_RIGHT_SYMMETRIC: | |
6e3b96ed | 1823 | pd_idx = sector_div(stripe2, raid_disks); |
911d4ee8 N |
1824 | qd_idx = (pd_idx + 1) % raid_disks; |
1825 | *dd_idx = (pd_idx + 2 + *dd_idx) % raid_disks; | |
16a53ecc | 1826 | break; |
99c0fb5f N |
1827 | |
1828 | case ALGORITHM_PARITY_0: | |
1829 | pd_idx = 0; | |
1830 | qd_idx = 1; | |
1831 | (*dd_idx) += 2; | |
1832 | break; | |
1833 | case ALGORITHM_PARITY_N: | |
1834 | pd_idx = data_disks; | |
1835 | qd_idx = data_disks + 1; | |
1836 | break; | |
1837 | ||
1838 | case ALGORITHM_ROTATING_ZERO_RESTART: | |
1839 | /* Exactly the same as RIGHT_ASYMMETRIC, but or | |
1840 | * of blocks for computing Q is different. | |
1841 | */ | |
6e3b96ed | 1842 | pd_idx = sector_div(stripe2, raid_disks); |
99c0fb5f N |
1843 | qd_idx = pd_idx + 1; |
1844 | if (pd_idx == raid_disks-1) { | |
1845 | (*dd_idx)++; /* Q D D D P */ | |
1846 | qd_idx = 0; | |
1847 | } else if (*dd_idx >= pd_idx) | |
1848 | (*dd_idx) += 2; /* D D P Q D */ | |
67cc2b81 | 1849 | ddf_layout = 1; |
99c0fb5f N |
1850 | break; |
1851 | ||
1852 | case ALGORITHM_ROTATING_N_RESTART: | |
1853 | /* Same a left_asymmetric, by first stripe is | |
1854 | * D D D P Q rather than | |
1855 | * Q D D D P | |
1856 | */ | |
6e3b96ed N |
1857 | stripe2 += 1; |
1858 | pd_idx = raid_disks - 1 - sector_div(stripe2, raid_disks); | |
99c0fb5f N |
1859 | qd_idx = pd_idx + 1; |
1860 | if (pd_idx == raid_disks-1) { | |
1861 | (*dd_idx)++; /* Q D D D P */ | |
1862 | qd_idx = 0; | |
1863 | } else if (*dd_idx >= pd_idx) | |
1864 | (*dd_idx) += 2; /* D D P Q D */ | |
67cc2b81 | 1865 | ddf_layout = 1; |
99c0fb5f N |
1866 | break; |
1867 | ||
1868 | case ALGORITHM_ROTATING_N_CONTINUE: | |
1869 | /* Same as left_symmetric but Q is before P */ | |
6e3b96ed | 1870 | pd_idx = raid_disks - 1 - sector_div(stripe2, raid_disks); |
99c0fb5f N |
1871 | qd_idx = (pd_idx + raid_disks - 1) % raid_disks; |
1872 | *dd_idx = (pd_idx + 1 + *dd_idx) % raid_disks; | |
67cc2b81 | 1873 | ddf_layout = 1; |
99c0fb5f N |
1874 | break; |
1875 | ||
1876 | case ALGORITHM_LEFT_ASYMMETRIC_6: | |
1877 | /* RAID5 left_asymmetric, with Q on last device */ | |
6e3b96ed | 1878 | pd_idx = data_disks - sector_div(stripe2, raid_disks-1); |
99c0fb5f N |
1879 | if (*dd_idx >= pd_idx) |
1880 | (*dd_idx)++; | |
1881 | qd_idx = raid_disks - 1; | |
1882 | break; | |
1883 | ||
1884 | case ALGORITHM_RIGHT_ASYMMETRIC_6: | |
6e3b96ed | 1885 | pd_idx = sector_div(stripe2, raid_disks-1); |
99c0fb5f N |
1886 | if (*dd_idx >= pd_idx) |
1887 | (*dd_idx)++; | |
1888 | qd_idx = raid_disks - 1; | |
1889 | break; | |
1890 | ||
1891 | case ALGORITHM_LEFT_SYMMETRIC_6: | |
6e3b96ed | 1892 | pd_idx = data_disks - sector_div(stripe2, raid_disks-1); |
99c0fb5f N |
1893 | *dd_idx = (pd_idx + 1 + *dd_idx) % (raid_disks-1); |
1894 | qd_idx = raid_disks - 1; | |
1895 | break; | |
1896 | ||
1897 | case ALGORITHM_RIGHT_SYMMETRIC_6: | |
6e3b96ed | 1898 | pd_idx = sector_div(stripe2, raid_disks-1); |
99c0fb5f N |
1899 | *dd_idx = (pd_idx + 1 + *dd_idx) % (raid_disks-1); |
1900 | qd_idx = raid_disks - 1; | |
1901 | break; | |
1902 | ||
1903 | case ALGORITHM_PARITY_0_6: | |
1904 | pd_idx = 0; | |
1905 | (*dd_idx)++; | |
1906 | qd_idx = raid_disks - 1; | |
1907 | break; | |
1908 | ||
16a53ecc | 1909 | default: |
99c0fb5f | 1910 | BUG(); |
16a53ecc N |
1911 | } |
1912 | break; | |
1da177e4 LT |
1913 | } |
1914 | ||
911d4ee8 N |
1915 | if (sh) { |
1916 | sh->pd_idx = pd_idx; | |
1917 | sh->qd_idx = qd_idx; | |
67cc2b81 | 1918 | sh->ddf_layout = ddf_layout; |
911d4ee8 | 1919 | } |
1da177e4 LT |
1920 | /* |
1921 | * Finally, compute the new sector number | |
1922 | */ | |
1923 | new_sector = (sector_t)stripe * sectors_per_chunk + chunk_offset; | |
1924 | return new_sector; | |
1925 | } | |
1926 | ||
1927 | ||
784052ec | 1928 | static sector_t compute_blocknr(struct stripe_head *sh, int i, int previous) |
1da177e4 LT |
1929 | { |
1930 | raid5_conf_t *conf = sh->raid_conf; | |
b875e531 N |
1931 | int raid_disks = sh->disks; |
1932 | int data_disks = raid_disks - conf->max_degraded; | |
1da177e4 | 1933 | sector_t new_sector = sh->sector, check; |
09c9e5fa AN |
1934 | int sectors_per_chunk = previous ? conf->prev_chunk_sectors |
1935 | : conf->chunk_sectors; | |
e183eaed N |
1936 | int algorithm = previous ? conf->prev_algo |
1937 | : conf->algorithm; | |
1da177e4 LT |
1938 | sector_t stripe; |
1939 | int chunk_offset; | |
35f2a591 N |
1940 | sector_t chunk_number; |
1941 | int dummy1, dd_idx = i; | |
1da177e4 | 1942 | sector_t r_sector; |
911d4ee8 | 1943 | struct stripe_head sh2; |
1da177e4 | 1944 | |
16a53ecc | 1945 | |
1da177e4 LT |
1946 | chunk_offset = sector_div(new_sector, sectors_per_chunk); |
1947 | stripe = new_sector; | |
1da177e4 | 1948 | |
16a53ecc N |
1949 | if (i == sh->pd_idx) |
1950 | return 0; | |
1951 | switch(conf->level) { | |
1952 | case 4: break; | |
1953 | case 5: | |
e183eaed | 1954 | switch (algorithm) { |
1da177e4 LT |
1955 | case ALGORITHM_LEFT_ASYMMETRIC: |
1956 | case ALGORITHM_RIGHT_ASYMMETRIC: | |
1957 | if (i > sh->pd_idx) | |
1958 | i--; | |
1959 | break; | |
1960 | case ALGORITHM_LEFT_SYMMETRIC: | |
1961 | case ALGORITHM_RIGHT_SYMMETRIC: | |
1962 | if (i < sh->pd_idx) | |
1963 | i += raid_disks; | |
1964 | i -= (sh->pd_idx + 1); | |
1965 | break; | |
99c0fb5f N |
1966 | case ALGORITHM_PARITY_0: |
1967 | i -= 1; | |
1968 | break; | |
1969 | case ALGORITHM_PARITY_N: | |
1970 | break; | |
1da177e4 | 1971 | default: |
99c0fb5f | 1972 | BUG(); |
16a53ecc N |
1973 | } |
1974 | break; | |
1975 | case 6: | |
d0dabf7e | 1976 | if (i == sh->qd_idx) |
16a53ecc | 1977 | return 0; /* It is the Q disk */ |
e183eaed | 1978 | switch (algorithm) { |
16a53ecc N |
1979 | case ALGORITHM_LEFT_ASYMMETRIC: |
1980 | case ALGORITHM_RIGHT_ASYMMETRIC: | |
99c0fb5f N |
1981 | case ALGORITHM_ROTATING_ZERO_RESTART: |
1982 | case ALGORITHM_ROTATING_N_RESTART: | |
1983 | if (sh->pd_idx == raid_disks-1) | |
1984 | i--; /* Q D D D P */ | |
16a53ecc N |
1985 | else if (i > sh->pd_idx) |
1986 | i -= 2; /* D D P Q D */ | |
1987 | break; | |
1988 | case ALGORITHM_LEFT_SYMMETRIC: | |
1989 | case ALGORITHM_RIGHT_SYMMETRIC: | |
1990 | if (sh->pd_idx == raid_disks-1) | |
1991 | i--; /* Q D D D P */ | |
1992 | else { | |
1993 | /* D D P Q D */ | |
1994 | if (i < sh->pd_idx) | |
1995 | i += raid_disks; | |
1996 | i -= (sh->pd_idx + 2); | |
1997 | } | |
1998 | break; | |
99c0fb5f N |
1999 | case ALGORITHM_PARITY_0: |
2000 | i -= 2; | |
2001 | break; | |
2002 | case ALGORITHM_PARITY_N: | |
2003 | break; | |
2004 | case ALGORITHM_ROTATING_N_CONTINUE: | |
e4424fee | 2005 | /* Like left_symmetric, but P is before Q */ |
99c0fb5f N |
2006 | if (sh->pd_idx == 0) |
2007 | i--; /* P D D D Q */ | |
e4424fee N |
2008 | else { |
2009 | /* D D Q P D */ | |
2010 | if (i < sh->pd_idx) | |
2011 | i += raid_disks; | |
2012 | i -= (sh->pd_idx + 1); | |
2013 | } | |
99c0fb5f N |
2014 | break; |
2015 | case ALGORITHM_LEFT_ASYMMETRIC_6: | |
2016 | case ALGORITHM_RIGHT_ASYMMETRIC_6: | |
2017 | if (i > sh->pd_idx) | |
2018 | i--; | |
2019 | break; | |
2020 | case ALGORITHM_LEFT_SYMMETRIC_6: | |
2021 | case ALGORITHM_RIGHT_SYMMETRIC_6: | |
2022 | if (i < sh->pd_idx) | |
2023 | i += data_disks + 1; | |
2024 | i -= (sh->pd_idx + 1); | |
2025 | break; | |
2026 | case ALGORITHM_PARITY_0_6: | |
2027 | i -= 1; | |
2028 | break; | |
16a53ecc | 2029 | default: |
99c0fb5f | 2030 | BUG(); |
16a53ecc N |
2031 | } |
2032 | break; | |
1da177e4 LT |
2033 | } |
2034 | ||
2035 | chunk_number = stripe * data_disks + i; | |
35f2a591 | 2036 | r_sector = chunk_number * sectors_per_chunk + chunk_offset; |
1da177e4 | 2037 | |
112bf897 | 2038 | check = raid5_compute_sector(conf, r_sector, |
784052ec | 2039 | previous, &dummy1, &sh2); |
911d4ee8 N |
2040 | if (check != sh->sector || dummy1 != dd_idx || sh2.pd_idx != sh->pd_idx |
2041 | || sh2.qd_idx != sh->qd_idx) { | |
0c55e022 N |
2042 | printk(KERN_ERR "md/raid:%s: compute_blocknr: map not correct\n", |
2043 | mdname(conf->mddev)); | |
1da177e4 LT |
2044 | return 0; |
2045 | } | |
2046 | return r_sector; | |
2047 | } | |
2048 | ||
2049 | ||
600aa109 | 2050 | static void |
c0f7bddb | 2051 | schedule_reconstruction(struct stripe_head *sh, struct stripe_head_state *s, |
600aa109 | 2052 | int rcw, int expand) |
e33129d8 DW |
2053 | { |
2054 | int i, pd_idx = sh->pd_idx, disks = sh->disks; | |
c0f7bddb YT |
2055 | raid5_conf_t *conf = sh->raid_conf; |
2056 | int level = conf->level; | |
e33129d8 DW |
2057 | |
2058 | if (rcw) { | |
2059 | /* if we are not expanding this is a proper write request, and | |
2060 | * there will be bios with new data to be drained into the | |
2061 | * stripe cache | |
2062 | */ | |
2063 | if (!expand) { | |
600aa109 DW |
2064 | sh->reconstruct_state = reconstruct_state_drain_run; |
2065 | set_bit(STRIPE_OP_BIODRAIN, &s->ops_request); | |
2066 | } else | |
2067 | sh->reconstruct_state = reconstruct_state_run; | |
16a53ecc | 2068 | |
ac6b53b6 | 2069 | set_bit(STRIPE_OP_RECONSTRUCT, &s->ops_request); |
e33129d8 DW |
2070 | |
2071 | for (i = disks; i--; ) { | |
2072 | struct r5dev *dev = &sh->dev[i]; | |
2073 | ||
2074 | if (dev->towrite) { | |
2075 | set_bit(R5_LOCKED, &dev->flags); | |
d8ee0728 | 2076 | set_bit(R5_Wantdrain, &dev->flags); |
e33129d8 DW |
2077 | if (!expand) |
2078 | clear_bit(R5_UPTODATE, &dev->flags); | |
600aa109 | 2079 | s->locked++; |
e33129d8 DW |
2080 | } |
2081 | } | |
c0f7bddb | 2082 | if (s->locked + conf->max_degraded == disks) |
8b3e6cdc | 2083 | if (!test_and_set_bit(STRIPE_FULL_WRITE, &sh->state)) |
c0f7bddb | 2084 | atomic_inc(&conf->pending_full_writes); |
e33129d8 | 2085 | } else { |
c0f7bddb | 2086 | BUG_ON(level == 6); |
e33129d8 DW |
2087 | BUG_ON(!(test_bit(R5_UPTODATE, &sh->dev[pd_idx].flags) || |
2088 | test_bit(R5_Wantcompute, &sh->dev[pd_idx].flags))); | |
2089 | ||
d8ee0728 | 2090 | sh->reconstruct_state = reconstruct_state_prexor_drain_run; |
600aa109 DW |
2091 | set_bit(STRIPE_OP_PREXOR, &s->ops_request); |
2092 | set_bit(STRIPE_OP_BIODRAIN, &s->ops_request); | |
ac6b53b6 | 2093 | set_bit(STRIPE_OP_RECONSTRUCT, &s->ops_request); |
e33129d8 DW |
2094 | |
2095 | for (i = disks; i--; ) { | |
2096 | struct r5dev *dev = &sh->dev[i]; | |
2097 | if (i == pd_idx) | |
2098 | continue; | |
2099 | ||
e33129d8 DW |
2100 | if (dev->towrite && |
2101 | (test_bit(R5_UPTODATE, &dev->flags) || | |
d8ee0728 DW |
2102 | test_bit(R5_Wantcompute, &dev->flags))) { |
2103 | set_bit(R5_Wantdrain, &dev->flags); | |
e33129d8 DW |
2104 | set_bit(R5_LOCKED, &dev->flags); |
2105 | clear_bit(R5_UPTODATE, &dev->flags); | |
600aa109 | 2106 | s->locked++; |
e33129d8 DW |
2107 | } |
2108 | } | |
2109 | } | |
2110 | ||
c0f7bddb | 2111 | /* keep the parity disk(s) locked while asynchronous operations |
e33129d8 DW |
2112 | * are in flight |
2113 | */ | |
2114 | set_bit(R5_LOCKED, &sh->dev[pd_idx].flags); | |
2115 | clear_bit(R5_UPTODATE, &sh->dev[pd_idx].flags); | |
600aa109 | 2116 | s->locked++; |
e33129d8 | 2117 | |
c0f7bddb YT |
2118 | if (level == 6) { |
2119 | int qd_idx = sh->qd_idx; | |
2120 | struct r5dev *dev = &sh->dev[qd_idx]; | |
2121 | ||
2122 | set_bit(R5_LOCKED, &dev->flags); | |
2123 | clear_bit(R5_UPTODATE, &dev->flags); | |
2124 | s->locked++; | |
2125 | } | |
2126 | ||
600aa109 | 2127 | pr_debug("%s: stripe %llu locked: %d ops_request: %lx\n", |
e46b272b | 2128 | __func__, (unsigned long long)sh->sector, |
600aa109 | 2129 | s->locked, s->ops_request); |
e33129d8 | 2130 | } |
16a53ecc | 2131 | |
1da177e4 LT |
2132 | /* |
2133 | * Each stripe/dev can have one or more bion attached. | |
16a53ecc | 2134 | * toread/towrite point to the first in a chain. |
1da177e4 LT |
2135 | * The bi_next chain must be in order. |
2136 | */ | |
2137 | static int add_stripe_bio(struct stripe_head *sh, struct bio *bi, int dd_idx, int forwrite) | |
2138 | { | |
2139 | struct bio **bip; | |
2140 | raid5_conf_t *conf = sh->raid_conf; | |
72626685 | 2141 | int firstwrite=0; |
1da177e4 | 2142 | |
45b4233c | 2143 | pr_debug("adding bh b#%llu to stripe s#%llu\n", |
1da177e4 LT |
2144 | (unsigned long long)bi->bi_sector, |
2145 | (unsigned long long)sh->sector); | |
2146 | ||
2147 | ||
2148 | spin_lock(&sh->lock); | |
2149 | spin_lock_irq(&conf->device_lock); | |
72626685 | 2150 | if (forwrite) { |
1da177e4 | 2151 | bip = &sh->dev[dd_idx].towrite; |
72626685 N |
2152 | if (*bip == NULL && sh->dev[dd_idx].written == NULL) |
2153 | firstwrite = 1; | |
2154 | } else | |
1da177e4 LT |
2155 | bip = &sh->dev[dd_idx].toread; |
2156 | while (*bip && (*bip)->bi_sector < bi->bi_sector) { | |
2157 | if ((*bip)->bi_sector + ((*bip)->bi_size >> 9) > bi->bi_sector) | |
2158 | goto overlap; | |
2159 | bip = & (*bip)->bi_next; | |
2160 | } | |
2161 | if (*bip && (*bip)->bi_sector < bi->bi_sector + ((bi->bi_size)>>9)) | |
2162 | goto overlap; | |
2163 | ||
78bafebd | 2164 | BUG_ON(*bip && bi->bi_next && (*bip) != bi->bi_next); |
1da177e4 LT |
2165 | if (*bip) |
2166 | bi->bi_next = *bip; | |
2167 | *bip = bi; | |
960e739d | 2168 | bi->bi_phys_segments++; |
1da177e4 LT |
2169 | spin_unlock_irq(&conf->device_lock); |
2170 | spin_unlock(&sh->lock); | |
2171 | ||
45b4233c | 2172 | pr_debug("added bi b#%llu to stripe s#%llu, disk %d.\n", |
1da177e4 LT |
2173 | (unsigned long long)bi->bi_sector, |
2174 | (unsigned long long)sh->sector, dd_idx); | |
2175 | ||
72626685 | 2176 | if (conf->mddev->bitmap && firstwrite) { |
72626685 N |
2177 | bitmap_startwrite(conf->mddev->bitmap, sh->sector, |
2178 | STRIPE_SECTORS, 0); | |
ae3c20cc | 2179 | sh->bm_seq = conf->seq_flush+1; |
72626685 N |
2180 | set_bit(STRIPE_BIT_DELAY, &sh->state); |
2181 | } | |
2182 | ||
1da177e4 LT |
2183 | if (forwrite) { |
2184 | /* check if page is covered */ | |
2185 | sector_t sector = sh->dev[dd_idx].sector; | |
2186 | for (bi=sh->dev[dd_idx].towrite; | |
2187 | sector < sh->dev[dd_idx].sector + STRIPE_SECTORS && | |
2188 | bi && bi->bi_sector <= sector; | |
2189 | bi = r5_next_bio(bi, sh->dev[dd_idx].sector)) { | |
2190 | if (bi->bi_sector + (bi->bi_size>>9) >= sector) | |
2191 | sector = bi->bi_sector + (bi->bi_size>>9); | |
2192 | } | |
2193 | if (sector >= sh->dev[dd_idx].sector + STRIPE_SECTORS) | |
2194 | set_bit(R5_OVERWRITE, &sh->dev[dd_idx].flags); | |
2195 | } | |
2196 | return 1; | |
2197 | ||
2198 | overlap: | |
2199 | set_bit(R5_Overlap, &sh->dev[dd_idx].flags); | |
2200 | spin_unlock_irq(&conf->device_lock); | |
2201 | spin_unlock(&sh->lock); | |
2202 | return 0; | |
2203 | } | |
2204 | ||
29269553 N |
2205 | static void end_reshape(raid5_conf_t *conf); |
2206 | ||
911d4ee8 N |
2207 | static void stripe_set_idx(sector_t stripe, raid5_conf_t *conf, int previous, |
2208 | struct stripe_head *sh) | |
ccfcc3c1 | 2209 | { |
784052ec | 2210 | int sectors_per_chunk = |
09c9e5fa | 2211 | previous ? conf->prev_chunk_sectors : conf->chunk_sectors; |
911d4ee8 | 2212 | int dd_idx; |
2d2063ce | 2213 | int chunk_offset = sector_div(stripe, sectors_per_chunk); |
112bf897 | 2214 | int disks = previous ? conf->previous_raid_disks : conf->raid_disks; |
2d2063ce | 2215 | |
112bf897 N |
2216 | raid5_compute_sector(conf, |
2217 | stripe * (disks - conf->max_degraded) | |
b875e531 | 2218 | *sectors_per_chunk + chunk_offset, |
112bf897 | 2219 | previous, |
911d4ee8 | 2220 | &dd_idx, sh); |
ccfcc3c1 N |
2221 | } |
2222 | ||
a4456856 | 2223 | static void |
1fe797e6 | 2224 | handle_failed_stripe(raid5_conf_t *conf, struct stripe_head *sh, |
a4456856 DW |
2225 | struct stripe_head_state *s, int disks, |
2226 | struct bio **return_bi) | |
2227 | { | |
2228 | int i; | |
2229 | for (i = disks; i--; ) { | |
2230 | struct bio *bi; | |
2231 | int bitmap_end = 0; | |
2232 | ||
2233 | if (test_bit(R5_ReadError, &sh->dev[i].flags)) { | |
2234 | mdk_rdev_t *rdev; | |
2235 | rcu_read_lock(); | |
2236 | rdev = rcu_dereference(conf->disks[i].rdev); | |
2237 | if (rdev && test_bit(In_sync, &rdev->flags)) | |
2238 | /* multiple read failures in one stripe */ | |
2239 | md_error(conf->mddev, rdev); | |
2240 | rcu_read_unlock(); | |
2241 | } | |
2242 | spin_lock_irq(&conf->device_lock); | |
2243 | /* fail all writes first */ | |
2244 | bi = sh->dev[i].towrite; | |
2245 | sh->dev[i].towrite = NULL; | |
2246 | if (bi) { | |
2247 | s->to_write--; | |
2248 | bitmap_end = 1; | |
2249 | } | |
2250 | ||
2251 | if (test_and_clear_bit(R5_Overlap, &sh->dev[i].flags)) | |
2252 | wake_up(&conf->wait_for_overlap); | |
2253 | ||
2254 | while (bi && bi->bi_sector < | |
2255 | sh->dev[i].sector + STRIPE_SECTORS) { | |
2256 | struct bio *nextbi = r5_next_bio(bi, sh->dev[i].sector); | |
2257 | clear_bit(BIO_UPTODATE, &bi->bi_flags); | |
960e739d | 2258 | if (!raid5_dec_bi_phys_segments(bi)) { |
a4456856 DW |
2259 | md_write_end(conf->mddev); |
2260 | bi->bi_next = *return_bi; | |
2261 | *return_bi = bi; | |
2262 | } | |
2263 | bi = nextbi; | |
2264 | } | |
2265 | /* and fail all 'written' */ | |
2266 | bi = sh->dev[i].written; | |
2267 | sh->dev[i].written = NULL; | |
2268 | if (bi) bitmap_end = 1; | |
2269 | while (bi && bi->bi_sector < | |
2270 | sh->dev[i].sector + STRIPE_SECTORS) { | |
2271 | struct bio *bi2 = r5_next_bio(bi, sh->dev[i].sector); | |
2272 | clear_bit(BIO_UPTODATE, &bi->bi_flags); | |
960e739d | 2273 | if (!raid5_dec_bi_phys_segments(bi)) { |
a4456856 DW |
2274 | md_write_end(conf->mddev); |
2275 | bi->bi_next = *return_bi; | |
2276 | *return_bi = bi; | |
2277 | } | |
2278 | bi = bi2; | |
2279 | } | |
2280 | ||
b5e98d65 DW |
2281 | /* fail any reads if this device is non-operational and |
2282 | * the data has not reached the cache yet. | |
2283 | */ | |
2284 | if (!test_bit(R5_Wantfill, &sh->dev[i].flags) && | |
2285 | (!test_bit(R5_Insync, &sh->dev[i].flags) || | |
2286 | test_bit(R5_ReadError, &sh->dev[i].flags))) { | |
a4456856 DW |
2287 | bi = sh->dev[i].toread; |
2288 | sh->dev[i].toread = NULL; | |
2289 | if (test_and_clear_bit(R5_Overlap, &sh->dev[i].flags)) | |
2290 | wake_up(&conf->wait_for_overlap); | |
2291 | if (bi) s->to_read--; | |
2292 | while (bi && bi->bi_sector < | |
2293 | sh->dev[i].sector + STRIPE_SECTORS) { | |
2294 | struct bio *nextbi = | |
2295 | r5_next_bio(bi, sh->dev[i].sector); | |
2296 | clear_bit(BIO_UPTODATE, &bi->bi_flags); | |
960e739d | 2297 | if (!raid5_dec_bi_phys_segments(bi)) { |
a4456856 DW |
2298 | bi->bi_next = *return_bi; |
2299 | *return_bi = bi; | |
2300 | } | |
2301 | bi = nextbi; | |
2302 | } | |
2303 | } | |
2304 | spin_unlock_irq(&conf->device_lock); | |
2305 | if (bitmap_end) | |
2306 | bitmap_endwrite(conf->mddev->bitmap, sh->sector, | |
2307 | STRIPE_SECTORS, 0, 0); | |
2308 | } | |
2309 | ||
8b3e6cdc DW |
2310 | if (test_and_clear_bit(STRIPE_FULL_WRITE, &sh->state)) |
2311 | if (atomic_dec_and_test(&conf->pending_full_writes)) | |
2312 | md_wakeup_thread(conf->mddev->thread); | |
a4456856 DW |
2313 | } |
2314 | ||
1fe797e6 DW |
2315 | /* fetch_block5 - checks the given member device to see if its data needs |
2316 | * to be read or computed to satisfy a request. | |
2317 | * | |
2318 | * Returns 1 when no more member devices need to be checked, otherwise returns | |
2319 | * 0 to tell the loop in handle_stripe_fill5 to continue | |
f38e1219 | 2320 | */ |
1fe797e6 DW |
2321 | static int fetch_block5(struct stripe_head *sh, struct stripe_head_state *s, |
2322 | int disk_idx, int disks) | |
f38e1219 DW |
2323 | { |
2324 | struct r5dev *dev = &sh->dev[disk_idx]; | |
2325 | struct r5dev *failed_dev = &sh->dev[s->failed_num]; | |
2326 | ||
f38e1219 DW |
2327 | /* is the data in this block needed, and can we get it? */ |
2328 | if (!test_bit(R5_LOCKED, &dev->flags) && | |
1fe797e6 DW |
2329 | !test_bit(R5_UPTODATE, &dev->flags) && |
2330 | (dev->toread || | |
2331 | (dev->towrite && !test_bit(R5_OVERWRITE, &dev->flags)) || | |
2332 | s->syncing || s->expanding || | |
2333 | (s->failed && | |
2334 | (failed_dev->toread || | |
2335 | (failed_dev->towrite && | |
2336 | !test_bit(R5_OVERWRITE, &failed_dev->flags)))))) { | |
976ea8d4 DW |
2337 | /* We would like to get this block, possibly by computing it, |
2338 | * otherwise read it if the backing disk is insync | |
f38e1219 DW |
2339 | */ |
2340 | if ((s->uptodate == disks - 1) && | |
ecc65c9b | 2341 | (s->failed && disk_idx == s->failed_num)) { |
976ea8d4 DW |
2342 | set_bit(STRIPE_COMPUTE_RUN, &sh->state); |
2343 | set_bit(STRIPE_OP_COMPUTE_BLK, &s->ops_request); | |
f38e1219 DW |
2344 | set_bit(R5_Wantcompute, &dev->flags); |
2345 | sh->ops.target = disk_idx; | |
ac6b53b6 | 2346 | sh->ops.target2 = -1; |
f38e1219 | 2347 | s->req_compute = 1; |
f38e1219 | 2348 | /* Careful: from this point on 'uptodate' is in the eye |
ac6b53b6 | 2349 | * of raid_run_ops which services 'compute' operations |
f38e1219 DW |
2350 | * before writes. R5_Wantcompute flags a block that will |
2351 | * be R5_UPTODATE by the time it is needed for a | |
2352 | * subsequent operation. | |
2353 | */ | |
2354 | s->uptodate++; | |
1fe797e6 | 2355 | return 1; /* uptodate + compute == disks */ |
7a1fc53c | 2356 | } else if (test_bit(R5_Insync, &dev->flags)) { |
f38e1219 DW |
2357 | set_bit(R5_LOCKED, &dev->flags); |
2358 | set_bit(R5_Wantread, &dev->flags); | |
f38e1219 DW |
2359 | s->locked++; |
2360 | pr_debug("Reading block %d (sync=%d)\n", disk_idx, | |
2361 | s->syncing); | |
2362 | } | |
2363 | } | |
2364 | ||
1fe797e6 | 2365 | return 0; |
f38e1219 DW |
2366 | } |
2367 | ||
1fe797e6 DW |
2368 | /** |
2369 | * handle_stripe_fill5 - read or compute data to satisfy pending requests. | |
2370 | */ | |
2371 | static void handle_stripe_fill5(struct stripe_head *sh, | |
a4456856 DW |
2372 | struct stripe_head_state *s, int disks) |
2373 | { | |
2374 | int i; | |
f38e1219 | 2375 | |
f38e1219 DW |
2376 | /* look for blocks to read/compute, skip this if a compute |
2377 | * is already in flight, or if the stripe contents are in the | |
2378 | * midst of changing due to a write | |
2379 | */ | |
976ea8d4 | 2380 | if (!test_bit(STRIPE_COMPUTE_RUN, &sh->state) && !sh->check_state && |
1fe797e6 | 2381 | !sh->reconstruct_state) |
f38e1219 | 2382 | for (i = disks; i--; ) |
1fe797e6 | 2383 | if (fetch_block5(sh, s, i, disks)) |
f38e1219 | 2384 | break; |
a4456856 DW |
2385 | set_bit(STRIPE_HANDLE, &sh->state); |
2386 | } | |
2387 | ||
5599becc YT |
2388 | /* fetch_block6 - checks the given member device to see if its data needs |
2389 | * to be read or computed to satisfy a request. | |
2390 | * | |
2391 | * Returns 1 when no more member devices need to be checked, otherwise returns | |
2392 | * 0 to tell the loop in handle_stripe_fill6 to continue | |
2393 | */ | |
2394 | static int fetch_block6(struct stripe_head *sh, struct stripe_head_state *s, | |
2395 | struct r6_state *r6s, int disk_idx, int disks) | |
a4456856 | 2396 | { |
5599becc YT |
2397 | struct r5dev *dev = &sh->dev[disk_idx]; |
2398 | struct r5dev *fdev[2] = { &sh->dev[r6s->failed_num[0]], | |
2399 | &sh->dev[r6s->failed_num[1]] }; | |
2400 | ||
2401 | if (!test_bit(R5_LOCKED, &dev->flags) && | |
2402 | !test_bit(R5_UPTODATE, &dev->flags) && | |
2403 | (dev->toread || | |
2404 | (dev->towrite && !test_bit(R5_OVERWRITE, &dev->flags)) || | |
2405 | s->syncing || s->expanding || | |
2406 | (s->failed >= 1 && | |
2407 | (fdev[0]->toread || s->to_write)) || | |
2408 | (s->failed >= 2 && | |
2409 | (fdev[1]->toread || s->to_write)))) { | |
2410 | /* we would like to get this block, possibly by computing it, | |
2411 | * otherwise read it if the backing disk is insync | |
2412 | */ | |
2413 | BUG_ON(test_bit(R5_Wantcompute, &dev->flags)); | |
2414 | BUG_ON(test_bit(R5_Wantread, &dev->flags)); | |
2415 | if ((s->uptodate == disks - 1) && | |
2416 | (s->failed && (disk_idx == r6s->failed_num[0] || | |
2417 | disk_idx == r6s->failed_num[1]))) { | |
2418 | /* have disk failed, and we're requested to fetch it; | |
2419 | * do compute it | |
a4456856 | 2420 | */ |
5599becc YT |
2421 | pr_debug("Computing stripe %llu block %d\n", |
2422 | (unsigned long long)sh->sector, disk_idx); | |
2423 | set_bit(STRIPE_COMPUTE_RUN, &sh->state); | |
2424 | set_bit(STRIPE_OP_COMPUTE_BLK, &s->ops_request); | |
2425 | set_bit(R5_Wantcompute, &dev->flags); | |
2426 | sh->ops.target = disk_idx; | |
2427 | sh->ops.target2 = -1; /* no 2nd target */ | |
2428 | s->req_compute = 1; | |
2429 | s->uptodate++; | |
2430 | return 1; | |
2431 | } else if (s->uptodate == disks-2 && s->failed >= 2) { | |
2432 | /* Computing 2-failure is *very* expensive; only | |
2433 | * do it if failed >= 2 | |
2434 | */ | |
2435 | int other; | |
2436 | for (other = disks; other--; ) { | |
2437 | if (other == disk_idx) | |
2438 | continue; | |
2439 | if (!test_bit(R5_UPTODATE, | |
2440 | &sh->dev[other].flags)) | |
2441 | break; | |
a4456856 | 2442 | } |
5599becc YT |
2443 | BUG_ON(other < 0); |
2444 | pr_debug("Computing stripe %llu blocks %d,%d\n", | |
2445 | (unsigned long long)sh->sector, | |
2446 | disk_idx, other); | |
2447 | set_bit(STRIPE_COMPUTE_RUN, &sh->state); | |
2448 | set_bit(STRIPE_OP_COMPUTE_BLK, &s->ops_request); | |
2449 | set_bit(R5_Wantcompute, &sh->dev[disk_idx].flags); | |
2450 | set_bit(R5_Wantcompute, &sh->dev[other].flags); | |
2451 | sh->ops.target = disk_idx; | |
2452 | sh->ops.target2 = other; | |
2453 | s->uptodate += 2; | |
2454 | s->req_compute = 1; | |
2455 | return 1; | |
2456 | } else if (test_bit(R5_Insync, &dev->flags)) { | |
2457 | set_bit(R5_LOCKED, &dev->flags); | |
2458 | set_bit(R5_Wantread, &dev->flags); | |
2459 | s->locked++; | |
2460 | pr_debug("Reading block %d (sync=%d)\n", | |
2461 | disk_idx, s->syncing); | |
a4456856 DW |
2462 | } |
2463 | } | |
5599becc YT |
2464 | |
2465 | return 0; | |
2466 | } | |
2467 | ||
2468 | /** | |
2469 | * handle_stripe_fill6 - read or compute data to satisfy pending requests. | |
2470 | */ | |
2471 | static void handle_stripe_fill6(struct stripe_head *sh, | |
2472 | struct stripe_head_state *s, struct r6_state *r6s, | |
2473 | int disks) | |
2474 | { | |
2475 | int i; | |
2476 | ||
2477 | /* look for blocks to read/compute, skip this if a compute | |
2478 | * is already in flight, or if the stripe contents are in the | |
2479 | * midst of changing due to a write | |
2480 | */ | |
2481 | if (!test_bit(STRIPE_COMPUTE_RUN, &sh->state) && !sh->check_state && | |
2482 | !sh->reconstruct_state) | |
2483 | for (i = disks; i--; ) | |
2484 | if (fetch_block6(sh, s, r6s, i, disks)) | |
2485 | break; | |
a4456856 DW |
2486 | set_bit(STRIPE_HANDLE, &sh->state); |
2487 | } | |
2488 | ||
2489 | ||
1fe797e6 | 2490 | /* handle_stripe_clean_event |
a4456856 DW |
2491 | * any written block on an uptodate or failed drive can be returned. |
2492 | * Note that if we 'wrote' to a failed drive, it will be UPTODATE, but | |
2493 | * never LOCKED, so we don't need to test 'failed' directly. | |
2494 | */ | |
1fe797e6 | 2495 | static void handle_stripe_clean_event(raid5_conf_t *conf, |
a4456856 DW |
2496 | struct stripe_head *sh, int disks, struct bio **return_bi) |
2497 | { | |
2498 | int i; | |
2499 | struct r5dev *dev; | |
2500 | ||
2501 | for (i = disks; i--; ) | |
2502 | if (sh->dev[i].written) { | |
2503 | dev = &sh->dev[i]; | |
2504 | if (!test_bit(R5_LOCKED, &dev->flags) && | |
2505 | test_bit(R5_UPTODATE, &dev->flags)) { | |
2506 | /* We can return any write requests */ | |
2507 | struct bio *wbi, *wbi2; | |
2508 | int bitmap_end = 0; | |
45b4233c | 2509 | pr_debug("Return write for disc %d\n", i); |
a4456856 DW |
2510 | spin_lock_irq(&conf->device_lock); |
2511 | wbi = dev->written; | |
2512 | dev->written = NULL; | |
2513 | while (wbi && wbi->bi_sector < | |
2514 | dev->sector + STRIPE_SECTORS) { | |
2515 | wbi2 = r5_next_bio(wbi, dev->sector); | |
960e739d | 2516 | if (!raid5_dec_bi_phys_segments(wbi)) { |
a4456856 DW |
2517 | md_write_end(conf->mddev); |
2518 | wbi->bi_next = *return_bi; | |
2519 | *return_bi = wbi; | |
2520 | } | |
2521 | wbi = wbi2; | |
2522 | } | |
2523 | if (dev->towrite == NULL) | |
2524 | bitmap_end = 1; | |
2525 | spin_unlock_irq(&conf->device_lock); | |
2526 | if (bitmap_end) | |
2527 | bitmap_endwrite(conf->mddev->bitmap, | |
2528 | sh->sector, | |
2529 | STRIPE_SECTORS, | |
2530 | !test_bit(STRIPE_DEGRADED, &sh->state), | |
2531 | 0); | |
2532 | } | |
2533 | } | |
8b3e6cdc DW |
2534 | |
2535 | if (test_and_clear_bit(STRIPE_FULL_WRITE, &sh->state)) | |
2536 | if (atomic_dec_and_test(&conf->pending_full_writes)) | |
2537 | md_wakeup_thread(conf->mddev->thread); | |
a4456856 DW |
2538 | } |
2539 | ||
1fe797e6 | 2540 | static void handle_stripe_dirtying5(raid5_conf_t *conf, |
a4456856 DW |
2541 | struct stripe_head *sh, struct stripe_head_state *s, int disks) |
2542 | { | |
2543 | int rmw = 0, rcw = 0, i; | |
2544 | for (i = disks; i--; ) { | |
2545 | /* would I have to read this buffer for read_modify_write */ | |
2546 | struct r5dev *dev = &sh->dev[i]; | |
2547 | if ((dev->towrite || i == sh->pd_idx) && | |
2548 | !test_bit(R5_LOCKED, &dev->flags) && | |
f38e1219 DW |
2549 | !(test_bit(R5_UPTODATE, &dev->flags) || |
2550 | test_bit(R5_Wantcompute, &dev->flags))) { | |
a4456856 DW |
2551 | if (test_bit(R5_Insync, &dev->flags)) |
2552 | rmw++; | |
2553 | else | |
2554 | rmw += 2*disks; /* cannot read it */ | |
2555 | } | |
2556 | /* Would I have to read this buffer for reconstruct_write */ | |
2557 | if (!test_bit(R5_OVERWRITE, &dev->flags) && i != sh->pd_idx && | |
2558 | !test_bit(R5_LOCKED, &dev->flags) && | |
f38e1219 DW |
2559 | !(test_bit(R5_UPTODATE, &dev->flags) || |
2560 | test_bit(R5_Wantcompute, &dev->flags))) { | |
2561 | if (test_bit(R5_Insync, &dev->flags)) rcw++; | |
a4456856 DW |
2562 | else |
2563 | rcw += 2*disks; | |
2564 | } | |
2565 | } | |
45b4233c | 2566 | pr_debug("for sector %llu, rmw=%d rcw=%d\n", |
a4456856 DW |
2567 | (unsigned long long)sh->sector, rmw, rcw); |
2568 | set_bit(STRIPE_HANDLE, &sh->state); | |
2569 | if (rmw < rcw && rmw > 0) | |
2570 | /* prefer read-modify-write, but need to get some data */ | |
2571 | for (i = disks; i--; ) { | |
2572 | struct r5dev *dev = &sh->dev[i]; | |
2573 | if ((dev->towrite || i == sh->pd_idx) && | |
2574 | !test_bit(R5_LOCKED, &dev->flags) && | |
f38e1219 DW |
2575 | !(test_bit(R5_UPTODATE, &dev->flags) || |
2576 | test_bit(R5_Wantcompute, &dev->flags)) && | |
a4456856 DW |
2577 | test_bit(R5_Insync, &dev->flags)) { |
2578 | if ( | |
2579 | test_bit(STRIPE_PREREAD_ACTIVE, &sh->state)) { | |
45b4233c | 2580 | pr_debug("Read_old block " |
a4456856 DW |
2581 | "%d for r-m-w\n", i); |
2582 | set_bit(R5_LOCKED, &dev->flags); | |
2583 | set_bit(R5_Wantread, &dev->flags); | |
2584 | s->locked++; | |
2585 | } else { | |
2586 | set_bit(STRIPE_DELAYED, &sh->state); | |
2587 | set_bit(STRIPE_HANDLE, &sh->state); | |
2588 | } | |
2589 | } | |
2590 | } | |
2591 | if (rcw <= rmw && rcw > 0) | |
2592 | /* want reconstruct write, but need to get some data */ | |
2593 | for (i = disks; i--; ) { | |
2594 | struct r5dev *dev = &sh->dev[i]; | |
2595 | if (!test_bit(R5_OVERWRITE, &dev->flags) && | |
2596 | i != sh->pd_idx && | |
2597 | !test_bit(R5_LOCKED, &dev->flags) && | |
f38e1219 DW |
2598 | !(test_bit(R5_UPTODATE, &dev->flags) || |
2599 | test_bit(R5_Wantcompute, &dev->flags)) && | |
a4456856 DW |
2600 | test_bit(R5_Insync, &dev->flags)) { |
2601 | if ( | |
2602 | test_bit(STRIPE_PREREAD_ACTIVE, &sh->state)) { | |
45b4233c | 2603 | pr_debug("Read_old block " |
a4456856 DW |
2604 | "%d for Reconstruct\n", i); |
2605 | set_bit(R5_LOCKED, &dev->flags); | |
2606 | set_bit(R5_Wantread, &dev->flags); | |
2607 | s->locked++; | |
2608 | } else { | |
2609 | set_bit(STRIPE_DELAYED, &sh->state); | |
2610 | set_bit(STRIPE_HANDLE, &sh->state); | |
2611 | } | |
2612 | } | |
2613 | } | |
2614 | /* now if nothing is locked, and if we have enough data, | |
2615 | * we can start a write request | |
2616 | */ | |
f38e1219 DW |
2617 | /* since handle_stripe can be called at any time we need to handle the |
2618 | * case where a compute block operation has been submitted and then a | |
ac6b53b6 DW |
2619 | * subsequent call wants to start a write request. raid_run_ops only |
2620 | * handles the case where compute block and reconstruct are requested | |
f38e1219 DW |
2621 | * simultaneously. If this is not the case then new writes need to be |
2622 | * held off until the compute completes. | |
2623 | */ | |
976ea8d4 DW |
2624 | if ((s->req_compute || !test_bit(STRIPE_COMPUTE_RUN, &sh->state)) && |
2625 | (s->locked == 0 && (rcw == 0 || rmw == 0) && | |
2626 | !test_bit(STRIPE_BIT_DELAY, &sh->state))) | |
c0f7bddb | 2627 | schedule_reconstruction(sh, s, rcw == 0, 0); |
a4456856 DW |
2628 | } |
2629 | ||
1fe797e6 | 2630 | static void handle_stripe_dirtying6(raid5_conf_t *conf, |
a4456856 DW |
2631 | struct stripe_head *sh, struct stripe_head_state *s, |
2632 | struct r6_state *r6s, int disks) | |
2633 | { | |
a9b39a74 | 2634 | int rcw = 0, pd_idx = sh->pd_idx, i; |
34e04e87 | 2635 | int qd_idx = sh->qd_idx; |
a9b39a74 YT |
2636 | |
2637 | set_bit(STRIPE_HANDLE, &sh->state); | |
a4456856 DW |
2638 | for (i = disks; i--; ) { |
2639 | struct r5dev *dev = &sh->dev[i]; | |
a9b39a74 YT |
2640 | /* check if we haven't enough data */ |
2641 | if (!test_bit(R5_OVERWRITE, &dev->flags) && | |
2642 | i != pd_idx && i != qd_idx && | |
2643 | !test_bit(R5_LOCKED, &dev->flags) && | |
2644 | !(test_bit(R5_UPTODATE, &dev->flags) || | |
2645 | test_bit(R5_Wantcompute, &dev->flags))) { | |
2646 | rcw++; | |
2647 | if (!test_bit(R5_Insync, &dev->flags)) | |
2648 | continue; /* it's a failed drive */ | |
2649 | ||
2650 | if ( | |
2651 | test_bit(STRIPE_PREREAD_ACTIVE, &sh->state)) { | |
2652 | pr_debug("Read_old stripe %llu " | |
2653 | "block %d for Reconstruct\n", | |
2654 | (unsigned long long)sh->sector, i); | |
2655 | set_bit(R5_LOCKED, &dev->flags); | |
2656 | set_bit(R5_Wantread, &dev->flags); | |
2657 | s->locked++; | |
2658 | } else { | |
2659 | pr_debug("Request delayed stripe %llu " | |
2660 | "block %d for Reconstruct\n", | |
2661 | (unsigned long long)sh->sector, i); | |
2662 | set_bit(STRIPE_DELAYED, &sh->state); | |
2663 | set_bit(STRIPE_HANDLE, &sh->state); | |
a4456856 DW |
2664 | } |
2665 | } | |
2666 | } | |
a4456856 DW |
2667 | /* now if nothing is locked, and if we have enough data, we can start a |
2668 | * write request | |
2669 | */ | |
a9b39a74 YT |
2670 | if ((s->req_compute || !test_bit(STRIPE_COMPUTE_RUN, &sh->state)) && |
2671 | s->locked == 0 && rcw == 0 && | |
a4456856 | 2672 | !test_bit(STRIPE_BIT_DELAY, &sh->state)) { |
a9b39a74 | 2673 | schedule_reconstruction(sh, s, 1, 0); |
a4456856 DW |
2674 | } |
2675 | } | |
2676 | ||
2677 | static void handle_parity_checks5(raid5_conf_t *conf, struct stripe_head *sh, | |
2678 | struct stripe_head_state *s, int disks) | |
2679 | { | |
ecc65c9b | 2680 | struct r5dev *dev = NULL; |
bd2ab670 | 2681 | |
a4456856 | 2682 | set_bit(STRIPE_HANDLE, &sh->state); |
e89f8962 | 2683 | |
ecc65c9b DW |
2684 | switch (sh->check_state) { |
2685 | case check_state_idle: | |
2686 | /* start a new check operation if there are no failures */ | |
bd2ab670 | 2687 | if (s->failed == 0) { |
bd2ab670 | 2688 | BUG_ON(s->uptodate != disks); |
ecc65c9b DW |
2689 | sh->check_state = check_state_run; |
2690 | set_bit(STRIPE_OP_CHECK, &s->ops_request); | |
bd2ab670 | 2691 | clear_bit(R5_UPTODATE, &sh->dev[sh->pd_idx].flags); |
bd2ab670 | 2692 | s->uptodate--; |
ecc65c9b | 2693 | break; |
bd2ab670 | 2694 | } |
ecc65c9b DW |
2695 | dev = &sh->dev[s->failed_num]; |
2696 | /* fall through */ | |
2697 | case check_state_compute_result: | |
2698 | sh->check_state = check_state_idle; | |
2699 | if (!dev) | |
2700 | dev = &sh->dev[sh->pd_idx]; | |
2701 | ||
2702 | /* check that a write has not made the stripe insync */ | |
2703 | if (test_bit(STRIPE_INSYNC, &sh->state)) | |
2704 | break; | |
c8894419 | 2705 | |
a4456856 | 2706 | /* either failed parity check, or recovery is happening */ |
a4456856 DW |
2707 | BUG_ON(!test_bit(R5_UPTODATE, &dev->flags)); |
2708 | BUG_ON(s->uptodate != disks); | |
2709 | ||
2710 | set_bit(R5_LOCKED, &dev->flags); | |
ecc65c9b | 2711 | s->locked++; |
a4456856 | 2712 | set_bit(R5_Wantwrite, &dev->flags); |
830ea016 | 2713 | |
a4456856 | 2714 | clear_bit(STRIPE_DEGRADED, &sh->state); |
a4456856 | 2715 | set_bit(STRIPE_INSYNC, &sh->state); |
ecc65c9b DW |
2716 | break; |
2717 | case check_state_run: | |
2718 | break; /* we will be called again upon completion */ | |
2719 | case check_state_check_result: | |
2720 | sh->check_state = check_state_idle; | |
2721 | ||
2722 | /* if a failure occurred during the check operation, leave | |
2723 | * STRIPE_INSYNC not set and let the stripe be handled again | |
2724 | */ | |
2725 | if (s->failed) | |
2726 | break; | |
2727 | ||
2728 | /* handle a successful check operation, if parity is correct | |
2729 | * we are done. Otherwise update the mismatch count and repair | |
2730 | * parity if !MD_RECOVERY_CHECK | |
2731 | */ | |
ad283ea4 | 2732 | if ((sh->ops.zero_sum_result & SUM_CHECK_P_RESULT) == 0) |
ecc65c9b DW |
2733 | /* parity is correct (on disc, |
2734 | * not in buffer any more) | |
2735 | */ | |
2736 | set_bit(STRIPE_INSYNC, &sh->state); | |
2737 | else { | |
2738 | conf->mddev->resync_mismatches += STRIPE_SECTORS; | |
2739 | if (test_bit(MD_RECOVERY_CHECK, &conf->mddev->recovery)) | |
2740 | /* don't try to repair!! */ | |
2741 | set_bit(STRIPE_INSYNC, &sh->state); | |
2742 | else { | |
2743 | sh->check_state = check_state_compute_run; | |
976ea8d4 | 2744 | set_bit(STRIPE_COMPUTE_RUN, &sh->state); |
ecc65c9b DW |
2745 | set_bit(STRIPE_OP_COMPUTE_BLK, &s->ops_request); |
2746 | set_bit(R5_Wantcompute, | |
2747 | &sh->dev[sh->pd_idx].flags); | |
2748 | sh->ops.target = sh->pd_idx; | |
ac6b53b6 | 2749 | sh->ops.target2 = -1; |
ecc65c9b DW |
2750 | s->uptodate++; |
2751 | } | |
2752 | } | |
2753 | break; | |
2754 | case check_state_compute_run: | |
2755 | break; | |
2756 | default: | |
2757 | printk(KERN_ERR "%s: unknown check_state: %d sector: %llu\n", | |
2758 | __func__, sh->check_state, | |
2759 | (unsigned long long) sh->sector); | |
2760 | BUG(); | |
a4456856 DW |
2761 | } |
2762 | } | |
2763 | ||
2764 | ||
2765 | static void handle_parity_checks6(raid5_conf_t *conf, struct stripe_head *sh, | |
36d1c647 DW |
2766 | struct stripe_head_state *s, |
2767 | struct r6_state *r6s, int disks) | |
a4456856 | 2768 | { |
a4456856 | 2769 | int pd_idx = sh->pd_idx; |
34e04e87 | 2770 | int qd_idx = sh->qd_idx; |
d82dfee0 | 2771 | struct r5dev *dev; |
a4456856 DW |
2772 | |
2773 | set_bit(STRIPE_HANDLE, &sh->state); | |
2774 | ||
2775 | BUG_ON(s->failed > 2); | |
d82dfee0 | 2776 | |
a4456856 DW |
2777 | /* Want to check and possibly repair P and Q. |
2778 | * However there could be one 'failed' device, in which | |
2779 | * case we can only check one of them, possibly using the | |
2780 | * other to generate missing data | |
2781 | */ | |
2782 | ||
d82dfee0 DW |
2783 | switch (sh->check_state) { |
2784 | case check_state_idle: | |
2785 | /* start a new check operation if there are < 2 failures */ | |
a4456856 | 2786 | if (s->failed == r6s->q_failed) { |
d82dfee0 | 2787 | /* The only possible failed device holds Q, so it |
a4456856 DW |
2788 | * makes sense to check P (If anything else were failed, |
2789 | * we would have used P to recreate it). | |
2790 | */ | |
d82dfee0 | 2791 | sh->check_state = check_state_run; |
a4456856 DW |
2792 | } |
2793 | if (!r6s->q_failed && s->failed < 2) { | |
d82dfee0 | 2794 | /* Q is not failed, and we didn't use it to generate |
a4456856 DW |
2795 | * anything, so it makes sense to check it |
2796 | */ | |
d82dfee0 DW |
2797 | if (sh->check_state == check_state_run) |
2798 | sh->check_state = check_state_run_pq; | |
2799 | else | |
2800 | sh->check_state = check_state_run_q; | |
a4456856 | 2801 | } |
a4456856 | 2802 | |
d82dfee0 DW |
2803 | /* discard potentially stale zero_sum_result */ |
2804 | sh->ops.zero_sum_result = 0; | |
a4456856 | 2805 | |
d82dfee0 DW |
2806 | if (sh->check_state == check_state_run) { |
2807 | /* async_xor_zero_sum destroys the contents of P */ | |
2808 | clear_bit(R5_UPTODATE, &sh->dev[pd_idx].flags); | |
2809 | s->uptodate--; | |
a4456856 | 2810 | } |
d82dfee0 DW |
2811 | if (sh->check_state >= check_state_run && |
2812 | sh->check_state <= check_state_run_pq) { | |
2813 | /* async_syndrome_zero_sum preserves P and Q, so | |
2814 | * no need to mark them !uptodate here | |
2815 | */ | |
2816 | set_bit(STRIPE_OP_CHECK, &s->ops_request); | |
2817 | break; | |
a4456856 DW |
2818 | } |
2819 | ||
d82dfee0 DW |
2820 | /* we have 2-disk failure */ |
2821 | BUG_ON(s->failed != 2); | |
2822 | /* fall through */ | |
2823 | case check_state_compute_result: | |
2824 | sh->check_state = check_state_idle; | |
a4456856 | 2825 | |
d82dfee0 DW |
2826 | /* check that a write has not made the stripe insync */ |
2827 | if (test_bit(STRIPE_INSYNC, &sh->state)) | |
2828 | break; | |
a4456856 DW |
2829 | |
2830 | /* now write out any block on a failed drive, | |
d82dfee0 | 2831 | * or P or Q if they were recomputed |
a4456856 | 2832 | */ |
d82dfee0 | 2833 | BUG_ON(s->uptodate < disks - 1); /* We don't need Q to recover */ |
a4456856 DW |
2834 | if (s->failed == 2) { |
2835 | dev = &sh->dev[r6s->failed_num[1]]; | |
2836 | s->locked++; | |
2837 | set_bit(R5_LOCKED, &dev->flags); | |
2838 | set_bit(R5_Wantwrite, &dev->flags); | |
2839 | } | |
2840 | if (s->failed >= 1) { | |
2841 | dev = &sh->dev[r6s->failed_num[0]]; | |
2842 | s->locked++; | |
2843 | set_bit(R5_LOCKED, &dev->flags); | |
2844 | set_bit(R5_Wantwrite, &dev->flags); | |
2845 | } | |
d82dfee0 | 2846 | if (sh->ops.zero_sum_result & SUM_CHECK_P_RESULT) { |
a4456856 DW |
2847 | dev = &sh->dev[pd_idx]; |
2848 | s->locked++; | |
2849 | set_bit(R5_LOCKED, &dev->flags); | |
2850 | set_bit(R5_Wantwrite, &dev->flags); | |
2851 | } | |
d82dfee0 | 2852 | if (sh->ops.zero_sum_result & SUM_CHECK_Q_RESULT) { |
a4456856 DW |
2853 | dev = &sh->dev[qd_idx]; |
2854 | s->locked++; | |
2855 | set_bit(R5_LOCKED, &dev->flags); | |
2856 | set_bit(R5_Wantwrite, &dev->flags); | |
2857 | } | |
2858 | clear_bit(STRIPE_DEGRADED, &sh->state); | |
2859 | ||
2860 | set_bit(STRIPE_INSYNC, &sh->state); | |
d82dfee0 DW |
2861 | break; |
2862 | case check_state_run: | |
2863 | case check_state_run_q: | |
2864 | case check_state_run_pq: | |
2865 | break; /* we will be called again upon completion */ | |
2866 | case check_state_check_result: | |
2867 | sh->check_state = check_state_idle; | |
2868 | ||
2869 | /* handle a successful check operation, if parity is correct | |
2870 | * we are done. Otherwise update the mismatch count and repair | |
2871 | * parity if !MD_RECOVERY_CHECK | |
2872 | */ | |
2873 | if (sh->ops.zero_sum_result == 0) { | |
2874 | /* both parities are correct */ | |
2875 | if (!s->failed) | |
2876 | set_bit(STRIPE_INSYNC, &sh->state); | |
2877 | else { | |
2878 | /* in contrast to the raid5 case we can validate | |
2879 | * parity, but still have a failure to write | |
2880 | * back | |
2881 | */ | |
2882 | sh->check_state = check_state_compute_result; | |
2883 | /* Returning at this point means that we may go | |
2884 | * off and bring p and/or q uptodate again so | |
2885 | * we make sure to check zero_sum_result again | |
2886 | * to verify if p or q need writeback | |
2887 | */ | |
2888 | } | |
2889 | } else { | |
2890 | conf->mddev->resync_mismatches += STRIPE_SECTORS; | |
2891 | if (test_bit(MD_RECOVERY_CHECK, &conf->mddev->recovery)) | |
2892 | /* don't try to repair!! */ | |
2893 | set_bit(STRIPE_INSYNC, &sh->state); | |
2894 | else { | |
2895 | int *target = &sh->ops.target; | |
2896 | ||
2897 | sh->ops.target = -1; | |
2898 | sh->ops.target2 = -1; | |
2899 | sh->check_state = check_state_compute_run; | |
2900 | set_bit(STRIPE_COMPUTE_RUN, &sh->state); | |
2901 | set_bit(STRIPE_OP_COMPUTE_BLK, &s->ops_request); | |
2902 | if (sh->ops.zero_sum_result & SUM_CHECK_P_RESULT) { | |
2903 | set_bit(R5_Wantcompute, | |
2904 | &sh->dev[pd_idx].flags); | |
2905 | *target = pd_idx; | |
2906 | target = &sh->ops.target2; | |
2907 | s->uptodate++; | |
2908 | } | |
2909 | if (sh->ops.zero_sum_result & SUM_CHECK_Q_RESULT) { | |
2910 | set_bit(R5_Wantcompute, | |
2911 | &sh->dev[qd_idx].flags); | |
2912 | *target = qd_idx; | |
2913 | s->uptodate++; | |
2914 | } | |
2915 | } | |
2916 | } | |
2917 | break; | |
2918 | case check_state_compute_run: | |
2919 | break; | |
2920 | default: | |
2921 | printk(KERN_ERR "%s: unknown check_state: %d sector: %llu\n", | |
2922 | __func__, sh->check_state, | |
2923 | (unsigned long long) sh->sector); | |
2924 | BUG(); | |
a4456856 DW |
2925 | } |
2926 | } | |
2927 | ||
2928 | static void handle_stripe_expansion(raid5_conf_t *conf, struct stripe_head *sh, | |
2929 | struct r6_state *r6s) | |
2930 | { | |
2931 | int i; | |
2932 | ||
2933 | /* We have read all the blocks in this stripe and now we need to | |
2934 | * copy some of them into a target stripe for expand. | |
2935 | */ | |
f0a50d37 | 2936 | struct dma_async_tx_descriptor *tx = NULL; |
a4456856 DW |
2937 | clear_bit(STRIPE_EXPAND_SOURCE, &sh->state); |
2938 | for (i = 0; i < sh->disks; i++) | |
34e04e87 | 2939 | if (i != sh->pd_idx && i != sh->qd_idx) { |
911d4ee8 | 2940 | int dd_idx, j; |
a4456856 | 2941 | struct stripe_head *sh2; |
a08abd8c | 2942 | struct async_submit_ctl submit; |
a4456856 | 2943 | |
784052ec | 2944 | sector_t bn = compute_blocknr(sh, i, 1); |
911d4ee8 N |
2945 | sector_t s = raid5_compute_sector(conf, bn, 0, |
2946 | &dd_idx, NULL); | |
a8c906ca | 2947 | sh2 = get_active_stripe(conf, s, 0, 1, 1); |
a4456856 DW |
2948 | if (sh2 == NULL) |
2949 | /* so far only the early blocks of this stripe | |
2950 | * have been requested. When later blocks | |
2951 | * get requested, we will try again | |
2952 | */ | |
2953 | continue; | |
2954 | if (!test_bit(STRIPE_EXPANDING, &sh2->state) || | |
2955 | test_bit(R5_Expanded, &sh2->dev[dd_idx].flags)) { | |
2956 | /* must have already done this block */ | |
2957 | release_stripe(sh2); | |
2958 | continue; | |
2959 | } | |
f0a50d37 DW |
2960 | |
2961 | /* place all the copies on one channel */ | |
a08abd8c | 2962 | init_async_submit(&submit, 0, tx, NULL, NULL, NULL); |
f0a50d37 | 2963 | tx = async_memcpy(sh2->dev[dd_idx].page, |
88ba2aa5 | 2964 | sh->dev[i].page, 0, 0, STRIPE_SIZE, |
a08abd8c | 2965 | &submit); |
f0a50d37 | 2966 | |
a4456856 DW |
2967 | set_bit(R5_Expanded, &sh2->dev[dd_idx].flags); |
2968 | set_bit(R5_UPTODATE, &sh2->dev[dd_idx].flags); | |
2969 | for (j = 0; j < conf->raid_disks; j++) | |
2970 | if (j != sh2->pd_idx && | |
d0dabf7e | 2971 | (!r6s || j != sh2->qd_idx) && |
a4456856 DW |
2972 | !test_bit(R5_Expanded, &sh2->dev[j].flags)) |
2973 | break; | |
2974 | if (j == conf->raid_disks) { | |
2975 | set_bit(STRIPE_EXPAND_READY, &sh2->state); | |
2976 | set_bit(STRIPE_HANDLE, &sh2->state); | |
2977 | } | |
2978 | release_stripe(sh2); | |
f0a50d37 | 2979 | |
a4456856 | 2980 | } |
a2e08551 N |
2981 | /* done submitting copies, wait for them to complete */ |
2982 | if (tx) { | |
2983 | async_tx_ack(tx); | |
2984 | dma_wait_for_async_tx(tx); | |
2985 | } | |
a4456856 | 2986 | } |
1da177e4 | 2987 | |
6bfe0b49 | 2988 | |
1da177e4 LT |
2989 | /* |
2990 | * handle_stripe - do things to a stripe. | |
2991 | * | |
2992 | * We lock the stripe and then examine the state of various bits | |
2993 | * to see what needs to be done. | |
2994 | * Possible results: | |
2995 | * return some read request which now have data | |
2996 | * return some write requests which are safely on disc | |
2997 | * schedule a read on some buffers | |
2998 | * schedule a write of some buffers | |
2999 | * return confirmation of parity correctness | |
3000 | * | |
1da177e4 LT |
3001 | * buffers are taken off read_list or write_list, and bh_cache buffers |
3002 | * get BH_Lock set before the stripe lock is released. | |
3003 | * | |
3004 | */ | |
a4456856 | 3005 | |
1442577b | 3006 | static void handle_stripe5(struct stripe_head *sh) |
1da177e4 LT |
3007 | { |
3008 | raid5_conf_t *conf = sh->raid_conf; | |
a4456856 DW |
3009 | int disks = sh->disks, i; |
3010 | struct bio *return_bi = NULL; | |
3011 | struct stripe_head_state s; | |
1da177e4 | 3012 | struct r5dev *dev; |
6bfe0b49 | 3013 | mdk_rdev_t *blocked_rdev = NULL; |
e0a115e5 | 3014 | int prexor; |
729a1866 | 3015 | int dec_preread_active = 0; |
1da177e4 | 3016 | |
a4456856 | 3017 | memset(&s, 0, sizeof(s)); |
600aa109 DW |
3018 | pr_debug("handling stripe %llu, state=%#lx cnt=%d, pd_idx=%d check:%d " |
3019 | "reconstruct:%d\n", (unsigned long long)sh->sector, sh->state, | |
3020 | atomic_read(&sh->count), sh->pd_idx, sh->check_state, | |
3021 | sh->reconstruct_state); | |
1da177e4 LT |
3022 | |
3023 | spin_lock(&sh->lock); | |
3024 | clear_bit(STRIPE_HANDLE, &sh->state); | |
3025 | clear_bit(STRIPE_DELAYED, &sh->state); | |
3026 | ||
a4456856 DW |
3027 | s.syncing = test_bit(STRIPE_SYNCING, &sh->state); |
3028 | s.expanding = test_bit(STRIPE_EXPAND_SOURCE, &sh->state); | |
3029 | s.expanded = test_bit(STRIPE_EXPAND_READY, &sh->state); | |
def6ae26 | 3030 | |
83de75cc | 3031 | /* Now to look around and see what can be done */ |
9910f16a | 3032 | rcu_read_lock(); |
1da177e4 LT |
3033 | for (i=disks; i--; ) { |
3034 | mdk_rdev_t *rdev; | |
a9f326eb N |
3035 | |
3036 | dev = &sh->dev[i]; | |
1da177e4 | 3037 | |
b5e98d65 DW |
3038 | pr_debug("check %d: state 0x%lx toread %p read %p write %p " |
3039 | "written %p\n", i, dev->flags, dev->toread, dev->read, | |
3040 | dev->towrite, dev->written); | |
3041 | ||
3042 | /* maybe we can request a biofill operation | |
3043 | * | |
3044 | * new wantfill requests are only permitted while | |
83de75cc | 3045 | * ops_complete_biofill is guaranteed to be inactive |
b5e98d65 DW |
3046 | */ |
3047 | if (test_bit(R5_UPTODATE, &dev->flags) && dev->toread && | |
83de75cc | 3048 | !test_bit(STRIPE_BIOFILL_RUN, &sh->state)) |
b5e98d65 | 3049 | set_bit(R5_Wantfill, &dev->flags); |
1da177e4 LT |
3050 | |
3051 | /* now count some things */ | |
a4456856 DW |
3052 | if (test_bit(R5_LOCKED, &dev->flags)) s.locked++; |
3053 | if (test_bit(R5_UPTODATE, &dev->flags)) s.uptodate++; | |
f38e1219 | 3054 | if (test_bit(R5_Wantcompute, &dev->flags)) s.compute++; |
1da177e4 | 3055 | |
b5e98d65 DW |
3056 | if (test_bit(R5_Wantfill, &dev->flags)) |
3057 | s.to_fill++; | |
3058 | else if (dev->toread) | |
a4456856 | 3059 | s.to_read++; |
1da177e4 | 3060 | if (dev->towrite) { |
a4456856 | 3061 | s.to_write++; |
1da177e4 | 3062 | if (!test_bit(R5_OVERWRITE, &dev->flags)) |
a4456856 | 3063 | s.non_overwrite++; |
1da177e4 | 3064 | } |
a4456856 DW |
3065 | if (dev->written) |
3066 | s.written++; | |
9910f16a | 3067 | rdev = rcu_dereference(conf->disks[i].rdev); |
ac4090d2 N |
3068 | if (blocked_rdev == NULL && |
3069 | rdev && unlikely(test_bit(Blocked, &rdev->flags))) { | |
6bfe0b49 DW |
3070 | blocked_rdev = rdev; |
3071 | atomic_inc(&rdev->nr_pending); | |
6bfe0b49 | 3072 | } |
415e72d0 N |
3073 | clear_bit(R5_Insync, &dev->flags); |
3074 | if (!rdev) | |
3075 | /* Not in-sync */; | |
3076 | else if (test_bit(In_sync, &rdev->flags)) | |
3077 | set_bit(R5_Insync, &dev->flags); | |
3078 | else { | |
3079 | /* could be in-sync depending on recovery/reshape status */ | |
3080 | if (sh->sector + STRIPE_SECTORS <= rdev->recovery_offset) | |
3081 | set_bit(R5_Insync, &dev->flags); | |
3082 | } | |
3083 | if (!test_bit(R5_Insync, &dev->flags)) { | |
14f8d26b | 3084 | /* The ReadError flag will just be confusing now */ |
4e5314b5 N |
3085 | clear_bit(R5_ReadError, &dev->flags); |
3086 | clear_bit(R5_ReWrite, &dev->flags); | |
3087 | } | |
415e72d0 N |
3088 | if (test_bit(R5_ReadError, &dev->flags)) |
3089 | clear_bit(R5_Insync, &dev->flags); | |
3090 | if (!test_bit(R5_Insync, &dev->flags)) { | |
a4456856 DW |
3091 | s.failed++; |
3092 | s.failed_num = i; | |
415e72d0 | 3093 | } |
1da177e4 | 3094 | } |
9910f16a | 3095 | rcu_read_unlock(); |
b5e98d65 | 3096 | |
6bfe0b49 | 3097 | if (unlikely(blocked_rdev)) { |
ac4090d2 N |
3098 | if (s.syncing || s.expanding || s.expanded || |
3099 | s.to_write || s.written) { | |
3100 | set_bit(STRIPE_HANDLE, &sh->state); | |
3101 | goto unlock; | |
3102 | } | |
3103 | /* There is nothing for the blocked_rdev to block */ | |
3104 | rdev_dec_pending(blocked_rdev, conf->mddev); | |
3105 | blocked_rdev = NULL; | |
6bfe0b49 DW |
3106 | } |
3107 | ||
83de75cc DW |
3108 | if (s.to_fill && !test_bit(STRIPE_BIOFILL_RUN, &sh->state)) { |
3109 | set_bit(STRIPE_OP_BIOFILL, &s.ops_request); | |
3110 | set_bit(STRIPE_BIOFILL_RUN, &sh->state); | |
3111 | } | |
b5e98d65 | 3112 | |
45b4233c | 3113 | pr_debug("locked=%d uptodate=%d to_read=%d" |
1da177e4 | 3114 | " to_write=%d failed=%d failed_num=%d\n", |
a4456856 DW |
3115 | s.locked, s.uptodate, s.to_read, s.to_write, |
3116 | s.failed, s.failed_num); | |
1da177e4 LT |
3117 | /* check if the array has lost two devices and, if so, some requests might |
3118 | * need to be failed | |
3119 | */ | |
a4456856 | 3120 | if (s.failed > 1 && s.to_read+s.to_write+s.written) |
1fe797e6 | 3121 | handle_failed_stripe(conf, sh, &s, disks, &return_bi); |
a4456856 | 3122 | if (s.failed > 1 && s.syncing) { |
1da177e4 LT |
3123 | md_done_sync(conf->mddev, STRIPE_SECTORS,0); |
3124 | clear_bit(STRIPE_SYNCING, &sh->state); | |
a4456856 | 3125 | s.syncing = 0; |
1da177e4 LT |
3126 | } |
3127 | ||
3128 | /* might be able to return some write requests if the parity block | |
3129 | * is safe, or on a failed drive | |
3130 | */ | |
3131 | dev = &sh->dev[sh->pd_idx]; | |
a4456856 DW |
3132 | if ( s.written && |
3133 | ((test_bit(R5_Insync, &dev->flags) && | |
3134 | !test_bit(R5_LOCKED, &dev->flags) && | |
3135 | test_bit(R5_UPTODATE, &dev->flags)) || | |
3136 | (s.failed == 1 && s.failed_num == sh->pd_idx))) | |
1fe797e6 | 3137 | handle_stripe_clean_event(conf, sh, disks, &return_bi); |
1da177e4 LT |
3138 | |
3139 | /* Now we might consider reading some blocks, either to check/generate | |
3140 | * parity, or to satisfy requests | |
3141 | * or to load a block that is being partially written. | |
3142 | */ | |
a4456856 | 3143 | if (s.to_read || s.non_overwrite || |
976ea8d4 | 3144 | (s.syncing && (s.uptodate + s.compute < disks)) || s.expanding) |
1fe797e6 | 3145 | handle_stripe_fill5(sh, &s, disks); |
1da177e4 | 3146 | |
e33129d8 DW |
3147 | /* Now we check to see if any write operations have recently |
3148 | * completed | |
3149 | */ | |
e0a115e5 | 3150 | prexor = 0; |
d8ee0728 | 3151 | if (sh->reconstruct_state == reconstruct_state_prexor_drain_result) |
e0a115e5 | 3152 | prexor = 1; |
d8ee0728 DW |
3153 | if (sh->reconstruct_state == reconstruct_state_drain_result || |
3154 | sh->reconstruct_state == reconstruct_state_prexor_drain_result) { | |
600aa109 | 3155 | sh->reconstruct_state = reconstruct_state_idle; |
e33129d8 DW |
3156 | |
3157 | /* All the 'written' buffers and the parity block are ready to | |
3158 | * be written back to disk | |
3159 | */ | |
3160 | BUG_ON(!test_bit(R5_UPTODATE, &sh->dev[sh->pd_idx].flags)); | |
3161 | for (i = disks; i--; ) { | |
3162 | dev = &sh->dev[i]; | |
3163 | if (test_bit(R5_LOCKED, &dev->flags) && | |
3164 | (i == sh->pd_idx || dev->written)) { | |
3165 | pr_debug("Writing block %d\n", i); | |
3166 | set_bit(R5_Wantwrite, &dev->flags); | |
e0a115e5 DW |
3167 | if (prexor) |
3168 | continue; | |
e33129d8 DW |
3169 | if (!test_bit(R5_Insync, &dev->flags) || |
3170 | (i == sh->pd_idx && s.failed == 0)) | |
3171 | set_bit(STRIPE_INSYNC, &sh->state); | |
3172 | } | |
3173 | } | |
729a1866 N |
3174 | if (test_and_clear_bit(STRIPE_PREREAD_ACTIVE, &sh->state)) |
3175 | dec_preread_active = 1; | |
e33129d8 DW |
3176 | } |
3177 | ||
3178 | /* Now to consider new write requests and what else, if anything | |
3179 | * should be read. We do not handle new writes when: | |
3180 | * 1/ A 'write' operation (copy+xor) is already in flight. | |
3181 | * 2/ A 'check' operation is in flight, as it may clobber the parity | |
3182 | * block. | |
3183 | */ | |
600aa109 | 3184 | if (s.to_write && !sh->reconstruct_state && !sh->check_state) |
1fe797e6 | 3185 | handle_stripe_dirtying5(conf, sh, &s, disks); |
1da177e4 LT |
3186 | |
3187 | /* maybe we need to check and possibly fix the parity for this stripe | |
e89f8962 DW |
3188 | * Any reads will already have been scheduled, so we just see if enough |
3189 | * data is available. The parity check is held off while parity | |
3190 | * dependent operations are in flight. | |
1da177e4 | 3191 | */ |
ecc65c9b DW |
3192 | if (sh->check_state || |
3193 | (s.syncing && s.locked == 0 && | |
976ea8d4 | 3194 | !test_bit(STRIPE_COMPUTE_RUN, &sh->state) && |
ecc65c9b | 3195 | !test_bit(STRIPE_INSYNC, &sh->state))) |
a4456856 | 3196 | handle_parity_checks5(conf, sh, &s, disks); |
e89f8962 | 3197 | |
a4456856 | 3198 | if (s.syncing && s.locked == 0 && test_bit(STRIPE_INSYNC, &sh->state)) { |
1da177e4 LT |
3199 | md_done_sync(conf->mddev, STRIPE_SECTORS,1); |
3200 | clear_bit(STRIPE_SYNCING, &sh->state); | |
3201 | } | |
4e5314b5 N |
3202 | |
3203 | /* If the failed drive is just a ReadError, then we might need to progress | |
3204 | * the repair/check process | |
3205 | */ | |
a4456856 DW |
3206 | if (s.failed == 1 && !conf->mddev->ro && |
3207 | test_bit(R5_ReadError, &sh->dev[s.failed_num].flags) | |
3208 | && !test_bit(R5_LOCKED, &sh->dev[s.failed_num].flags) | |
3209 | && test_bit(R5_UPTODATE, &sh->dev[s.failed_num].flags) | |
4e5314b5 | 3210 | ) { |
a4456856 | 3211 | dev = &sh->dev[s.failed_num]; |
4e5314b5 N |
3212 | if (!test_bit(R5_ReWrite, &dev->flags)) { |
3213 | set_bit(R5_Wantwrite, &dev->flags); | |
3214 | set_bit(R5_ReWrite, &dev->flags); | |
3215 | set_bit(R5_LOCKED, &dev->flags); | |
a4456856 | 3216 | s.locked++; |
4e5314b5 N |
3217 | } else { |
3218 | /* let's read it back */ | |
3219 | set_bit(R5_Wantread, &dev->flags); | |
3220 | set_bit(R5_LOCKED, &dev->flags); | |
a4456856 | 3221 | s.locked++; |
4e5314b5 N |
3222 | } |
3223 | } | |
3224 | ||
600aa109 DW |
3225 | /* Finish reconstruct operations initiated by the expansion process */ |
3226 | if (sh->reconstruct_state == reconstruct_state_result) { | |
ab69ae12 | 3227 | struct stripe_head *sh2 |
a8c906ca | 3228 | = get_active_stripe(conf, sh->sector, 1, 1, 1); |
ab69ae12 N |
3229 | if (sh2 && test_bit(STRIPE_EXPAND_SOURCE, &sh2->state)) { |
3230 | /* sh cannot be written until sh2 has been read. | |
3231 | * so arrange for sh to be delayed a little | |
3232 | */ | |
3233 | set_bit(STRIPE_DELAYED, &sh->state); | |
3234 | set_bit(STRIPE_HANDLE, &sh->state); | |
3235 | if (!test_and_set_bit(STRIPE_PREREAD_ACTIVE, | |
3236 | &sh2->state)) | |
3237 | atomic_inc(&conf->preread_active_stripes); | |
3238 | release_stripe(sh2); | |
3239 | goto unlock; | |
3240 | } | |
3241 | if (sh2) | |
3242 | release_stripe(sh2); | |
3243 | ||
600aa109 | 3244 | sh->reconstruct_state = reconstruct_state_idle; |
f0a50d37 | 3245 | clear_bit(STRIPE_EXPANDING, &sh->state); |
23397883 | 3246 | for (i = conf->raid_disks; i--; ) { |
ccfcc3c1 | 3247 | set_bit(R5_Wantwrite, &sh->dev[i].flags); |
23397883 | 3248 | set_bit(R5_LOCKED, &sh->dev[i].flags); |
efe31143 | 3249 | s.locked++; |
23397883 | 3250 | } |
f0a50d37 DW |
3251 | } |
3252 | ||
3253 | if (s.expanded && test_bit(STRIPE_EXPANDING, &sh->state) && | |
600aa109 | 3254 | !sh->reconstruct_state) { |
f0a50d37 DW |
3255 | /* Need to write out all blocks after computing parity */ |
3256 | sh->disks = conf->raid_disks; | |
911d4ee8 | 3257 | stripe_set_idx(sh->sector, conf, 0, sh); |
c0f7bddb | 3258 | schedule_reconstruction(sh, &s, 1, 1); |
600aa109 | 3259 | } else if (s.expanded && !sh->reconstruct_state && s.locked == 0) { |
ccfcc3c1 | 3260 | clear_bit(STRIPE_EXPAND_READY, &sh->state); |
f6705578 | 3261 | atomic_dec(&conf->reshape_stripes); |
ccfcc3c1 N |
3262 | wake_up(&conf->wait_for_overlap); |
3263 | md_done_sync(conf->mddev, STRIPE_SECTORS, 1); | |
3264 | } | |
3265 | ||
0f94e87c | 3266 | if (s.expanding && s.locked == 0 && |
976ea8d4 | 3267 | !test_bit(STRIPE_COMPUTE_RUN, &sh->state)) |
a4456856 | 3268 | handle_stripe_expansion(conf, sh, NULL); |
ccfcc3c1 | 3269 | |
6bfe0b49 | 3270 | unlock: |
1da177e4 LT |
3271 | spin_unlock(&sh->lock); |
3272 | ||
6bfe0b49 DW |
3273 | /* wait for this device to become unblocked */ |
3274 | if (unlikely(blocked_rdev)) | |
3275 | md_wait_for_blocked_rdev(blocked_rdev, conf->mddev); | |
3276 | ||
600aa109 | 3277 | if (s.ops_request) |
ac6b53b6 | 3278 | raid_run_ops(sh, s.ops_request); |
d84e0f10 | 3279 | |
c4e5ac0a | 3280 | ops_run_io(sh, &s); |
1da177e4 | 3281 | |
729a1866 N |
3282 | if (dec_preread_active) { |
3283 | /* We delay this until after ops_run_io so that if make_request | |
3284 | * is waiting on a barrier, it won't continue until the writes | |
3285 | * have actually been submitted. | |
3286 | */ | |
3287 | atomic_dec(&conf->preread_active_stripes); | |
3288 | if (atomic_read(&conf->preread_active_stripes) < | |
3289 | IO_THRESHOLD) | |
3290 | md_wakeup_thread(conf->mddev->thread); | |
3291 | } | |
a4456856 | 3292 | return_io(return_bi); |
1da177e4 LT |
3293 | } |
3294 | ||
1442577b | 3295 | static void handle_stripe6(struct stripe_head *sh) |
1da177e4 | 3296 | { |
bff61975 | 3297 | raid5_conf_t *conf = sh->raid_conf; |
f416885e | 3298 | int disks = sh->disks; |
a4456856 | 3299 | struct bio *return_bi = NULL; |
34e04e87 | 3300 | int i, pd_idx = sh->pd_idx, qd_idx = sh->qd_idx; |
a4456856 DW |
3301 | struct stripe_head_state s; |
3302 | struct r6_state r6s; | |
16a53ecc | 3303 | struct r5dev *dev, *pdev, *qdev; |
6bfe0b49 | 3304 | mdk_rdev_t *blocked_rdev = NULL; |
729a1866 | 3305 | int dec_preread_active = 0; |
1da177e4 | 3306 | |
45b4233c | 3307 | pr_debug("handling stripe %llu, state=%#lx cnt=%d, " |
6c0069c0 | 3308 | "pd_idx=%d, qd_idx=%d\n, check:%d, reconstruct:%d\n", |
a4456856 | 3309 | (unsigned long long)sh->sector, sh->state, |
6c0069c0 YT |
3310 | atomic_read(&sh->count), pd_idx, qd_idx, |
3311 | sh->check_state, sh->reconstruct_state); | |
a4456856 | 3312 | memset(&s, 0, sizeof(s)); |
72626685 | 3313 | |
16a53ecc N |
3314 | spin_lock(&sh->lock); |
3315 | clear_bit(STRIPE_HANDLE, &sh->state); | |
3316 | clear_bit(STRIPE_DELAYED, &sh->state); | |
3317 | ||
a4456856 DW |
3318 | s.syncing = test_bit(STRIPE_SYNCING, &sh->state); |
3319 | s.expanding = test_bit(STRIPE_EXPAND_SOURCE, &sh->state); | |
3320 | s.expanded = test_bit(STRIPE_EXPAND_READY, &sh->state); | |
16a53ecc | 3321 | /* Now to look around and see what can be done */ |
1da177e4 LT |
3322 | |
3323 | rcu_read_lock(); | |
16a53ecc N |
3324 | for (i=disks; i--; ) { |
3325 | mdk_rdev_t *rdev; | |
3326 | dev = &sh->dev[i]; | |
1da177e4 | 3327 | |
45b4233c | 3328 | pr_debug("check %d: state 0x%lx read %p write %p written %p\n", |
16a53ecc | 3329 | i, dev->flags, dev->toread, dev->towrite, dev->written); |
6c0069c0 YT |
3330 | /* maybe we can reply to a read |
3331 | * | |
3332 | * new wantfill requests are only permitted while | |
3333 | * ops_complete_biofill is guaranteed to be inactive | |
3334 | */ | |
3335 | if (test_bit(R5_UPTODATE, &dev->flags) && dev->toread && | |
3336 | !test_bit(STRIPE_BIOFILL_RUN, &sh->state)) | |
3337 | set_bit(R5_Wantfill, &dev->flags); | |
1da177e4 | 3338 | |
16a53ecc | 3339 | /* now count some things */ |
a4456856 DW |
3340 | if (test_bit(R5_LOCKED, &dev->flags)) s.locked++; |
3341 | if (test_bit(R5_UPTODATE, &dev->flags)) s.uptodate++; | |
2d6e4ecc DW |
3342 | if (test_bit(R5_Wantcompute, &dev->flags)) { |
3343 | s.compute++; | |
3344 | BUG_ON(s.compute > 2); | |
3345 | } | |
1da177e4 | 3346 | |
6c0069c0 YT |
3347 | if (test_bit(R5_Wantfill, &dev->flags)) { |
3348 | s.to_fill++; | |
3349 | } else if (dev->toread) | |
a4456856 | 3350 | s.to_read++; |
16a53ecc | 3351 | if (dev->towrite) { |
a4456856 | 3352 | s.to_write++; |
16a53ecc | 3353 | if (!test_bit(R5_OVERWRITE, &dev->flags)) |
a4456856 | 3354 | s.non_overwrite++; |
16a53ecc | 3355 | } |
a4456856 DW |
3356 | if (dev->written) |
3357 | s.written++; | |
16a53ecc | 3358 | rdev = rcu_dereference(conf->disks[i].rdev); |
ac4090d2 N |
3359 | if (blocked_rdev == NULL && |
3360 | rdev && unlikely(test_bit(Blocked, &rdev->flags))) { | |
6bfe0b49 DW |
3361 | blocked_rdev = rdev; |
3362 | atomic_inc(&rdev->nr_pending); | |
6bfe0b49 | 3363 | } |
415e72d0 N |
3364 | clear_bit(R5_Insync, &dev->flags); |
3365 | if (!rdev) | |
3366 | /* Not in-sync */; | |
3367 | else if (test_bit(In_sync, &rdev->flags)) | |
3368 | set_bit(R5_Insync, &dev->flags); | |
3369 | else { | |
3370 | /* in sync if before recovery_offset */ | |
3371 | if (sh->sector + STRIPE_SECTORS <= rdev->recovery_offset) | |
3372 | set_bit(R5_Insync, &dev->flags); | |
3373 | } | |
3374 | if (!test_bit(R5_Insync, &dev->flags)) { | |
16a53ecc N |
3375 | /* The ReadError flag will just be confusing now */ |
3376 | clear_bit(R5_ReadError, &dev->flags); | |
3377 | clear_bit(R5_ReWrite, &dev->flags); | |
1da177e4 | 3378 | } |
415e72d0 N |
3379 | if (test_bit(R5_ReadError, &dev->flags)) |
3380 | clear_bit(R5_Insync, &dev->flags); | |
3381 | if (!test_bit(R5_Insync, &dev->flags)) { | |
a4456856 DW |
3382 | if (s.failed < 2) |
3383 | r6s.failed_num[s.failed] = i; | |
3384 | s.failed++; | |
415e72d0 | 3385 | } |
1da177e4 LT |
3386 | } |
3387 | rcu_read_unlock(); | |
6bfe0b49 DW |
3388 | |
3389 | if (unlikely(blocked_rdev)) { | |
ac4090d2 N |
3390 | if (s.syncing || s.expanding || s.expanded || |
3391 | s.to_write || s.written) { | |
3392 | set_bit(STRIPE_HANDLE, &sh->state); | |
3393 | goto unlock; | |
3394 | } | |
3395 | /* There is nothing for the blocked_rdev to block */ | |
3396 | rdev_dec_pending(blocked_rdev, conf->mddev); | |
3397 | blocked_rdev = NULL; | |
6bfe0b49 | 3398 | } |
ac4090d2 | 3399 | |
6c0069c0 YT |
3400 | if (s.to_fill && !test_bit(STRIPE_BIOFILL_RUN, &sh->state)) { |
3401 | set_bit(STRIPE_OP_BIOFILL, &s.ops_request); | |
3402 | set_bit(STRIPE_BIOFILL_RUN, &sh->state); | |
3403 | } | |
3404 | ||
45b4233c | 3405 | pr_debug("locked=%d uptodate=%d to_read=%d" |
16a53ecc | 3406 | " to_write=%d failed=%d failed_num=%d,%d\n", |
a4456856 DW |
3407 | s.locked, s.uptodate, s.to_read, s.to_write, s.failed, |
3408 | r6s.failed_num[0], r6s.failed_num[1]); | |
3409 | /* check if the array has lost >2 devices and, if so, some requests | |
3410 | * might need to be failed | |
16a53ecc | 3411 | */ |
a4456856 | 3412 | if (s.failed > 2 && s.to_read+s.to_write+s.written) |
1fe797e6 | 3413 | handle_failed_stripe(conf, sh, &s, disks, &return_bi); |
a4456856 | 3414 | if (s.failed > 2 && s.syncing) { |
16a53ecc N |
3415 | md_done_sync(conf->mddev, STRIPE_SECTORS,0); |
3416 | clear_bit(STRIPE_SYNCING, &sh->state); | |
a4456856 | 3417 | s.syncing = 0; |
16a53ecc N |
3418 | } |
3419 | ||
3420 | /* | |
3421 | * might be able to return some write requests if the parity blocks | |
3422 | * are safe, or on a failed drive | |
3423 | */ | |
3424 | pdev = &sh->dev[pd_idx]; | |
a4456856 DW |
3425 | r6s.p_failed = (s.failed >= 1 && r6s.failed_num[0] == pd_idx) |
3426 | || (s.failed >= 2 && r6s.failed_num[1] == pd_idx); | |
34e04e87 N |
3427 | qdev = &sh->dev[qd_idx]; |
3428 | r6s.q_failed = (s.failed >= 1 && r6s.failed_num[0] == qd_idx) | |
3429 | || (s.failed >= 2 && r6s.failed_num[1] == qd_idx); | |
a4456856 DW |
3430 | |
3431 | if ( s.written && | |
3432 | ( r6s.p_failed || ((test_bit(R5_Insync, &pdev->flags) | |
16a53ecc | 3433 | && !test_bit(R5_LOCKED, &pdev->flags) |
a4456856 DW |
3434 | && test_bit(R5_UPTODATE, &pdev->flags)))) && |
3435 | ( r6s.q_failed || ((test_bit(R5_Insync, &qdev->flags) | |
16a53ecc | 3436 | && !test_bit(R5_LOCKED, &qdev->flags) |
a4456856 | 3437 | && test_bit(R5_UPTODATE, &qdev->flags))))) |
1fe797e6 | 3438 | handle_stripe_clean_event(conf, sh, disks, &return_bi); |
16a53ecc N |
3439 | |
3440 | /* Now we might consider reading some blocks, either to check/generate | |
3441 | * parity, or to satisfy requests | |
3442 | * or to load a block that is being partially written. | |
3443 | */ | |
a4456856 | 3444 | if (s.to_read || s.non_overwrite || (s.to_write && s.failed) || |
6c0069c0 | 3445 | (s.syncing && (s.uptodate + s.compute < disks)) || s.expanding) |
1fe797e6 | 3446 | handle_stripe_fill6(sh, &s, &r6s, disks); |
16a53ecc | 3447 | |
6c0069c0 YT |
3448 | /* Now we check to see if any write operations have recently |
3449 | * completed | |
3450 | */ | |
3451 | if (sh->reconstruct_state == reconstruct_state_drain_result) { | |
6c0069c0 YT |
3452 | |
3453 | sh->reconstruct_state = reconstruct_state_idle; | |
3454 | /* All the 'written' buffers and the parity blocks are ready to | |
3455 | * be written back to disk | |
3456 | */ | |
3457 | BUG_ON(!test_bit(R5_UPTODATE, &sh->dev[sh->pd_idx].flags)); | |
3458 | BUG_ON(!test_bit(R5_UPTODATE, &sh->dev[qd_idx].flags)); | |
3459 | for (i = disks; i--; ) { | |
3460 | dev = &sh->dev[i]; | |
3461 | if (test_bit(R5_LOCKED, &dev->flags) && | |
3462 | (i == sh->pd_idx || i == qd_idx || | |
3463 | dev->written)) { | |
3464 | pr_debug("Writing block %d\n", i); | |
3465 | BUG_ON(!test_bit(R5_UPTODATE, &dev->flags)); | |
3466 | set_bit(R5_Wantwrite, &dev->flags); | |
3467 | if (!test_bit(R5_Insync, &dev->flags) || | |
3468 | ((i == sh->pd_idx || i == qd_idx) && | |
3469 | s.failed == 0)) | |
3470 | set_bit(STRIPE_INSYNC, &sh->state); | |
3471 | } | |
3472 | } | |
729a1866 N |
3473 | if (test_and_clear_bit(STRIPE_PREREAD_ACTIVE, &sh->state)) |
3474 | dec_preread_active = 1; | |
6c0069c0 YT |
3475 | } |
3476 | ||
a9b39a74 YT |
3477 | /* Now to consider new write requests and what else, if anything |
3478 | * should be read. We do not handle new writes when: | |
3479 | * 1/ A 'write' operation (copy+gen_syndrome) is already in flight. | |
3480 | * 2/ A 'check' operation is in flight, as it may clobber the parity | |
3481 | * block. | |
3482 | */ | |
3483 | if (s.to_write && !sh->reconstruct_state && !sh->check_state) | |
1fe797e6 | 3484 | handle_stripe_dirtying6(conf, sh, &s, &r6s, disks); |
16a53ecc N |
3485 | |
3486 | /* maybe we need to check and possibly fix the parity for this stripe | |
a4456856 | 3487 | * Any reads will already have been scheduled, so we just see if enough |
6c0069c0 YT |
3488 | * data is available. The parity check is held off while parity |
3489 | * dependent operations are in flight. | |
16a53ecc | 3490 | */ |
6c0069c0 YT |
3491 | if (sh->check_state || |
3492 | (s.syncing && s.locked == 0 && | |
3493 | !test_bit(STRIPE_COMPUTE_RUN, &sh->state) && | |
3494 | !test_bit(STRIPE_INSYNC, &sh->state))) | |
36d1c647 | 3495 | handle_parity_checks6(conf, sh, &s, &r6s, disks); |
16a53ecc | 3496 | |
a4456856 | 3497 | if (s.syncing && s.locked == 0 && test_bit(STRIPE_INSYNC, &sh->state)) { |
16a53ecc N |
3498 | md_done_sync(conf->mddev, STRIPE_SECTORS,1); |
3499 | clear_bit(STRIPE_SYNCING, &sh->state); | |
3500 | } | |
3501 | ||
3502 | /* If the failed drives are just a ReadError, then we might need | |
3503 | * to progress the repair/check process | |
3504 | */ | |
a4456856 DW |
3505 | if (s.failed <= 2 && !conf->mddev->ro) |
3506 | for (i = 0; i < s.failed; i++) { | |
3507 | dev = &sh->dev[r6s.failed_num[i]]; | |
16a53ecc N |
3508 | if (test_bit(R5_ReadError, &dev->flags) |
3509 | && !test_bit(R5_LOCKED, &dev->flags) | |
3510 | && test_bit(R5_UPTODATE, &dev->flags) | |
3511 | ) { | |
3512 | if (!test_bit(R5_ReWrite, &dev->flags)) { | |
3513 | set_bit(R5_Wantwrite, &dev->flags); | |
3514 | set_bit(R5_ReWrite, &dev->flags); | |
3515 | set_bit(R5_LOCKED, &dev->flags); | |
6c0069c0 | 3516 | s.locked++; |
16a53ecc N |
3517 | } else { |
3518 | /* let's read it back */ | |
3519 | set_bit(R5_Wantread, &dev->flags); | |
3520 | set_bit(R5_LOCKED, &dev->flags); | |
6c0069c0 | 3521 | s.locked++; |
16a53ecc N |
3522 | } |
3523 | } | |
3524 | } | |
f416885e | 3525 | |
6c0069c0 YT |
3526 | /* Finish reconstruct operations initiated by the expansion process */ |
3527 | if (sh->reconstruct_state == reconstruct_state_result) { | |
3528 | sh->reconstruct_state = reconstruct_state_idle; | |
3529 | clear_bit(STRIPE_EXPANDING, &sh->state); | |
3530 | for (i = conf->raid_disks; i--; ) { | |
3531 | set_bit(R5_Wantwrite, &sh->dev[i].flags); | |
3532 | set_bit(R5_LOCKED, &sh->dev[i].flags); | |
3533 | s.locked++; | |
3534 | } | |
3535 | } | |
3536 | ||
3537 | if (s.expanded && test_bit(STRIPE_EXPANDING, &sh->state) && | |
3538 | !sh->reconstruct_state) { | |
ab69ae12 | 3539 | struct stripe_head *sh2 |
a8c906ca | 3540 | = get_active_stripe(conf, sh->sector, 1, 1, 1); |
ab69ae12 N |
3541 | if (sh2 && test_bit(STRIPE_EXPAND_SOURCE, &sh2->state)) { |
3542 | /* sh cannot be written until sh2 has been read. | |
3543 | * so arrange for sh to be delayed a little | |
3544 | */ | |
3545 | set_bit(STRIPE_DELAYED, &sh->state); | |
3546 | set_bit(STRIPE_HANDLE, &sh->state); | |
3547 | if (!test_and_set_bit(STRIPE_PREREAD_ACTIVE, | |
3548 | &sh2->state)) | |
3549 | atomic_inc(&conf->preread_active_stripes); | |
3550 | release_stripe(sh2); | |
3551 | goto unlock; | |
3552 | } | |
3553 | if (sh2) | |
3554 | release_stripe(sh2); | |
3555 | ||
f416885e N |
3556 | /* Need to write out all blocks after computing P&Q */ |
3557 | sh->disks = conf->raid_disks; | |
911d4ee8 | 3558 | stripe_set_idx(sh->sector, conf, 0, sh); |
6c0069c0 YT |
3559 | schedule_reconstruction(sh, &s, 1, 1); |
3560 | } else if (s.expanded && !sh->reconstruct_state && s.locked == 0) { | |
f416885e N |
3561 | clear_bit(STRIPE_EXPAND_READY, &sh->state); |
3562 | atomic_dec(&conf->reshape_stripes); | |
3563 | wake_up(&conf->wait_for_overlap); | |
3564 | md_done_sync(conf->mddev, STRIPE_SECTORS, 1); | |
3565 | } | |
3566 | ||
0f94e87c | 3567 | if (s.expanding && s.locked == 0 && |
976ea8d4 | 3568 | !test_bit(STRIPE_COMPUTE_RUN, &sh->state)) |
a4456856 | 3569 | handle_stripe_expansion(conf, sh, &r6s); |
f416885e | 3570 | |
6bfe0b49 | 3571 | unlock: |
16a53ecc N |
3572 | spin_unlock(&sh->lock); |
3573 | ||
6bfe0b49 DW |
3574 | /* wait for this device to become unblocked */ |
3575 | if (unlikely(blocked_rdev)) | |
3576 | md_wait_for_blocked_rdev(blocked_rdev, conf->mddev); | |
3577 | ||
6c0069c0 YT |
3578 | if (s.ops_request) |
3579 | raid_run_ops(sh, s.ops_request); | |
3580 | ||
f0e43bcd | 3581 | ops_run_io(sh, &s); |
16a53ecc | 3582 | |
729a1866 N |
3583 | |
3584 | if (dec_preread_active) { | |
3585 | /* We delay this until after ops_run_io so that if make_request | |
3586 | * is waiting on a barrier, it won't continue until the writes | |
3587 | * have actually been submitted. | |
3588 | */ | |
3589 | atomic_dec(&conf->preread_active_stripes); | |
3590 | if (atomic_read(&conf->preread_active_stripes) < | |
3591 | IO_THRESHOLD) | |
3592 | md_wakeup_thread(conf->mddev->thread); | |
3593 | } | |
3594 | ||
f0e43bcd | 3595 | return_io(return_bi); |
16a53ecc N |
3596 | } |
3597 | ||
1442577b | 3598 | static void handle_stripe(struct stripe_head *sh) |
16a53ecc N |
3599 | { |
3600 | if (sh->raid_conf->level == 6) | |
1442577b | 3601 | handle_stripe6(sh); |
16a53ecc | 3602 | else |
1442577b | 3603 | handle_stripe5(sh); |
16a53ecc N |
3604 | } |
3605 | ||
16a53ecc N |
3606 | static void raid5_activate_delayed(raid5_conf_t *conf) |
3607 | { | |
3608 | if (atomic_read(&conf->preread_active_stripes) < IO_THRESHOLD) { | |
3609 | while (!list_empty(&conf->delayed_list)) { | |
3610 | struct list_head *l = conf->delayed_list.next; | |
3611 | struct stripe_head *sh; | |
3612 | sh = list_entry(l, struct stripe_head, lru); | |
3613 | list_del_init(l); | |
3614 | clear_bit(STRIPE_DELAYED, &sh->state); | |
3615 | if (!test_and_set_bit(STRIPE_PREREAD_ACTIVE, &sh->state)) | |
3616 | atomic_inc(&conf->preread_active_stripes); | |
8b3e6cdc | 3617 | list_add_tail(&sh->lru, &conf->hold_list); |
16a53ecc | 3618 | } |
6ed3003c | 3619 | } else |
2ac87401 | 3620 | plugger_set_plug(&conf->plug); |
16a53ecc N |
3621 | } |
3622 | ||
3623 | static void activate_bit_delay(raid5_conf_t *conf) | |
3624 | { | |
3625 | /* device_lock is held */ | |
3626 | struct list_head head; | |
3627 | list_add(&head, &conf->bitmap_list); | |
3628 | list_del_init(&conf->bitmap_list); | |
3629 | while (!list_empty(&head)) { | |
3630 | struct stripe_head *sh = list_entry(head.next, struct stripe_head, lru); | |
3631 | list_del_init(&sh->lru); | |
3632 | atomic_inc(&sh->count); | |
3633 | __release_stripe(conf, sh); | |
3634 | } | |
3635 | } | |
3636 | ||
3637 | static void unplug_slaves(mddev_t *mddev) | |
3638 | { | |
070ec55d | 3639 | raid5_conf_t *conf = mddev->private; |
16a53ecc | 3640 | int i; |
5e5e3e78 | 3641 | int devs = max(conf->raid_disks, conf->previous_raid_disks); |
16a53ecc N |
3642 | |
3643 | rcu_read_lock(); | |
5e5e3e78 | 3644 | for (i = 0; i < devs; i++) { |
16a53ecc N |
3645 | mdk_rdev_t *rdev = rcu_dereference(conf->disks[i].rdev); |
3646 | if (rdev && !test_bit(Faulty, &rdev->flags) && atomic_read(&rdev->nr_pending)) { | |
165125e1 | 3647 | struct request_queue *r_queue = bdev_get_queue(rdev->bdev); |
16a53ecc N |
3648 | |
3649 | atomic_inc(&rdev->nr_pending); | |
3650 | rcu_read_unlock(); | |
3651 | ||
2ad8b1ef | 3652 | blk_unplug(r_queue); |
16a53ecc N |
3653 | |
3654 | rdev_dec_pending(rdev, mddev); | |
3655 | rcu_read_lock(); | |
3656 | } | |
3657 | } | |
3658 | rcu_read_unlock(); | |
3659 | } | |
3660 | ||
9f7c2220 | 3661 | void md_raid5_unplug_device(raid5_conf_t *conf) |
16a53ecc | 3662 | { |
16a53ecc N |
3663 | unsigned long flags; |
3664 | ||
3665 | spin_lock_irqsave(&conf->device_lock, flags); | |
3666 | ||
2ac87401 | 3667 | if (plugger_remove_plug(&conf->plug)) { |
16a53ecc N |
3668 | conf->seq_flush++; |
3669 | raid5_activate_delayed(conf); | |
72626685 | 3670 | } |
2ac87401 | 3671 | md_wakeup_thread(conf->mddev->thread); |
1da177e4 LT |
3672 | |
3673 | spin_unlock_irqrestore(&conf->device_lock, flags); | |
3674 | ||
2ac87401 | 3675 | unplug_slaves(conf->mddev); |
1da177e4 | 3676 | } |
9f7c2220 | 3677 | EXPORT_SYMBOL_GPL(md_raid5_unplug_device); |
1da177e4 | 3678 | |
2ac87401 N |
3679 | static void raid5_unplug(struct plug_handle *plug) |
3680 | { | |
3681 | raid5_conf_t *conf = container_of(plug, raid5_conf_t, plug); | |
9f7c2220 | 3682 | md_raid5_unplug_device(conf); |
2ac87401 N |
3683 | } |
3684 | ||
3685 | static void raid5_unplug_queue(struct request_queue *q) | |
3686 | { | |
3687 | mddev_t *mddev = q->queuedata; | |
9f7c2220 | 3688 | md_raid5_unplug_device(mddev->private); |
1da177e4 LT |
3689 | } |
3690 | ||
11d8a6e3 | 3691 | int md_raid5_congested(mddev_t *mddev, int bits) |
f022b2fd | 3692 | { |
070ec55d | 3693 | raid5_conf_t *conf = mddev->private; |
f022b2fd N |
3694 | |
3695 | /* No difference between reads and writes. Just check | |
3696 | * how busy the stripe_cache is | |
3697 | */ | |
3fa841d7 | 3698 | |
f022b2fd N |
3699 | if (conf->inactive_blocked) |
3700 | return 1; | |
3701 | if (conf->quiesce) | |
3702 | return 1; | |
3703 | if (list_empty_careful(&conf->inactive_list)) | |
3704 | return 1; | |
3705 | ||
3706 | return 0; | |
3707 | } | |
11d8a6e3 N |
3708 | EXPORT_SYMBOL_GPL(md_raid5_congested); |
3709 | ||
3710 | static int raid5_congested(void *data, int bits) | |
3711 | { | |
3712 | mddev_t *mddev = data; | |
3713 | ||
3714 | return mddev_congested(mddev, bits) || | |
3715 | md_raid5_congested(mddev, bits); | |
3716 | } | |
f022b2fd | 3717 | |
23032a0e RBJ |
3718 | /* We want read requests to align with chunks where possible, |
3719 | * but write requests don't need to. | |
3720 | */ | |
cc371e66 AK |
3721 | static int raid5_mergeable_bvec(struct request_queue *q, |
3722 | struct bvec_merge_data *bvm, | |
3723 | struct bio_vec *biovec) | |
23032a0e RBJ |
3724 | { |
3725 | mddev_t *mddev = q->queuedata; | |
cc371e66 | 3726 | sector_t sector = bvm->bi_sector + get_start_sect(bvm->bi_bdev); |
23032a0e | 3727 | int max; |
9d8f0363 | 3728 | unsigned int chunk_sectors = mddev->chunk_sectors; |
cc371e66 | 3729 | unsigned int bio_sectors = bvm->bi_size >> 9; |
23032a0e | 3730 | |
cc371e66 | 3731 | if ((bvm->bi_rw & 1) == WRITE) |
23032a0e RBJ |
3732 | return biovec->bv_len; /* always allow writes to be mergeable */ |
3733 | ||
664e7c41 AN |
3734 | if (mddev->new_chunk_sectors < mddev->chunk_sectors) |
3735 | chunk_sectors = mddev->new_chunk_sectors; | |
23032a0e RBJ |
3736 | max = (chunk_sectors - ((sector & (chunk_sectors - 1)) + bio_sectors)) << 9; |
3737 | if (max < 0) max = 0; | |
3738 | if (max <= biovec->bv_len && bio_sectors == 0) | |
3739 | return biovec->bv_len; | |
3740 | else | |
3741 | return max; | |
3742 | } | |
3743 | ||
f679623f RBJ |
3744 | |
3745 | static int in_chunk_boundary(mddev_t *mddev, struct bio *bio) | |
3746 | { | |
3747 | sector_t sector = bio->bi_sector + get_start_sect(bio->bi_bdev); | |
9d8f0363 | 3748 | unsigned int chunk_sectors = mddev->chunk_sectors; |
f679623f RBJ |
3749 | unsigned int bio_sectors = bio->bi_size >> 9; |
3750 | ||
664e7c41 AN |
3751 | if (mddev->new_chunk_sectors < mddev->chunk_sectors) |
3752 | chunk_sectors = mddev->new_chunk_sectors; | |
f679623f RBJ |
3753 | return chunk_sectors >= |
3754 | ((sector & (chunk_sectors - 1)) + bio_sectors); | |
3755 | } | |
3756 | ||
46031f9a RBJ |
3757 | /* |
3758 | * add bio to the retry LIFO ( in O(1) ... we are in interrupt ) | |
3759 | * later sampled by raid5d. | |
3760 | */ | |
3761 | static void add_bio_to_retry(struct bio *bi,raid5_conf_t *conf) | |
3762 | { | |
3763 | unsigned long flags; | |
3764 | ||
3765 | spin_lock_irqsave(&conf->device_lock, flags); | |
3766 | ||
3767 | bi->bi_next = conf->retry_read_aligned_list; | |
3768 | conf->retry_read_aligned_list = bi; | |
3769 | ||
3770 | spin_unlock_irqrestore(&conf->device_lock, flags); | |
3771 | md_wakeup_thread(conf->mddev->thread); | |
3772 | } | |
3773 | ||
3774 | ||
3775 | static struct bio *remove_bio_from_retry(raid5_conf_t *conf) | |
3776 | { | |
3777 | struct bio *bi; | |
3778 | ||
3779 | bi = conf->retry_read_aligned; | |
3780 | if (bi) { | |
3781 | conf->retry_read_aligned = NULL; | |
3782 | return bi; | |
3783 | } | |
3784 | bi = conf->retry_read_aligned_list; | |
3785 | if(bi) { | |
387bb173 | 3786 | conf->retry_read_aligned_list = bi->bi_next; |
46031f9a | 3787 | bi->bi_next = NULL; |
960e739d JA |
3788 | /* |
3789 | * this sets the active strip count to 1 and the processed | |
3790 | * strip count to zero (upper 8 bits) | |
3791 | */ | |
46031f9a | 3792 | bi->bi_phys_segments = 1; /* biased count of active stripes */ |
46031f9a RBJ |
3793 | } |
3794 | ||
3795 | return bi; | |
3796 | } | |
3797 | ||
3798 | ||
f679623f RBJ |
3799 | /* |
3800 | * The "raid5_align_endio" should check if the read succeeded and if it | |
3801 | * did, call bio_endio on the original bio (having bio_put the new bio | |
3802 | * first). | |
3803 | * If the read failed.. | |
3804 | */ | |
6712ecf8 | 3805 | static void raid5_align_endio(struct bio *bi, int error) |
f679623f RBJ |
3806 | { |
3807 | struct bio* raid_bi = bi->bi_private; | |
46031f9a RBJ |
3808 | mddev_t *mddev; |
3809 | raid5_conf_t *conf; | |
3810 | int uptodate = test_bit(BIO_UPTODATE, &bi->bi_flags); | |
3811 | mdk_rdev_t *rdev; | |
3812 | ||
f679623f | 3813 | bio_put(bi); |
46031f9a | 3814 | |
46031f9a RBJ |
3815 | rdev = (void*)raid_bi->bi_next; |
3816 | raid_bi->bi_next = NULL; | |
2b7f2228 N |
3817 | mddev = rdev->mddev; |
3818 | conf = mddev->private; | |
46031f9a RBJ |
3819 | |
3820 | rdev_dec_pending(rdev, conf->mddev); | |
3821 | ||
3822 | if (!error && uptodate) { | |
6712ecf8 | 3823 | bio_endio(raid_bi, 0); |
46031f9a RBJ |
3824 | if (atomic_dec_and_test(&conf->active_aligned_reads)) |
3825 | wake_up(&conf->wait_for_stripe); | |
6712ecf8 | 3826 | return; |
46031f9a RBJ |
3827 | } |
3828 | ||
3829 | ||
45b4233c | 3830 | pr_debug("raid5_align_endio : io error...handing IO for a retry\n"); |
46031f9a RBJ |
3831 | |
3832 | add_bio_to_retry(raid_bi, conf); | |
f679623f RBJ |
3833 | } |
3834 | ||
387bb173 NB |
3835 | static int bio_fits_rdev(struct bio *bi) |
3836 | { | |
165125e1 | 3837 | struct request_queue *q = bdev_get_queue(bi->bi_bdev); |
387bb173 | 3838 | |
ae03bf63 | 3839 | if ((bi->bi_size>>9) > queue_max_sectors(q)) |
387bb173 NB |
3840 | return 0; |
3841 | blk_recount_segments(q, bi); | |
8a78362c | 3842 | if (bi->bi_phys_segments > queue_max_segments(q)) |
387bb173 NB |
3843 | return 0; |
3844 | ||
3845 | if (q->merge_bvec_fn) | |
3846 | /* it's too hard to apply the merge_bvec_fn at this stage, | |
3847 | * just just give up | |
3848 | */ | |
3849 | return 0; | |
3850 | ||
3851 | return 1; | |
3852 | } | |
3853 | ||
3854 | ||
21a52c6d | 3855 | static int chunk_aligned_read(mddev_t *mddev, struct bio * raid_bio) |
f679623f | 3856 | { |
070ec55d | 3857 | raid5_conf_t *conf = mddev->private; |
8553fe7e | 3858 | int dd_idx; |
f679623f RBJ |
3859 | struct bio* align_bi; |
3860 | mdk_rdev_t *rdev; | |
3861 | ||
3862 | if (!in_chunk_boundary(mddev, raid_bio)) { | |
45b4233c | 3863 | pr_debug("chunk_aligned_read : non aligned\n"); |
f679623f RBJ |
3864 | return 0; |
3865 | } | |
3866 | /* | |
99c0fb5f | 3867 | * use bio_clone to make a copy of the bio |
f679623f RBJ |
3868 | */ |
3869 | align_bi = bio_clone(raid_bio, GFP_NOIO); | |
3870 | if (!align_bi) | |
3871 | return 0; | |
3872 | /* | |
3873 | * set bi_end_io to a new function, and set bi_private to the | |
3874 | * original bio. | |
3875 | */ | |
3876 | align_bi->bi_end_io = raid5_align_endio; | |
3877 | align_bi->bi_private = raid_bio; | |
3878 | /* | |
3879 | * compute position | |
3880 | */ | |
112bf897 N |
3881 | align_bi->bi_sector = raid5_compute_sector(conf, raid_bio->bi_sector, |
3882 | 0, | |
911d4ee8 | 3883 | &dd_idx, NULL); |
f679623f RBJ |
3884 | |
3885 | rcu_read_lock(); | |
3886 | rdev = rcu_dereference(conf->disks[dd_idx].rdev); | |
3887 | if (rdev && test_bit(In_sync, &rdev->flags)) { | |
f679623f RBJ |
3888 | atomic_inc(&rdev->nr_pending); |
3889 | rcu_read_unlock(); | |
46031f9a RBJ |
3890 | raid_bio->bi_next = (void*)rdev; |
3891 | align_bi->bi_bdev = rdev->bdev; | |
3892 | align_bi->bi_flags &= ~(1 << BIO_SEG_VALID); | |
3893 | align_bi->bi_sector += rdev->data_offset; | |
3894 | ||
387bb173 NB |
3895 | if (!bio_fits_rdev(align_bi)) { |
3896 | /* too big in some way */ | |
3897 | bio_put(align_bi); | |
3898 | rdev_dec_pending(rdev, mddev); | |
3899 | return 0; | |
3900 | } | |
3901 | ||
46031f9a RBJ |
3902 | spin_lock_irq(&conf->device_lock); |
3903 | wait_event_lock_irq(conf->wait_for_stripe, | |
3904 | conf->quiesce == 0, | |
3905 | conf->device_lock, /* nothing */); | |
3906 | atomic_inc(&conf->active_aligned_reads); | |
3907 | spin_unlock_irq(&conf->device_lock); | |
3908 | ||
f679623f RBJ |
3909 | generic_make_request(align_bi); |
3910 | return 1; | |
3911 | } else { | |
3912 | rcu_read_unlock(); | |
46031f9a | 3913 | bio_put(align_bi); |
f679623f RBJ |
3914 | return 0; |
3915 | } | |
3916 | } | |
3917 | ||
8b3e6cdc DW |
3918 | /* __get_priority_stripe - get the next stripe to process |
3919 | * | |
3920 | * Full stripe writes are allowed to pass preread active stripes up until | |
3921 | * the bypass_threshold is exceeded. In general the bypass_count | |
3922 | * increments when the handle_list is handled before the hold_list; however, it | |
3923 | * will not be incremented when STRIPE_IO_STARTED is sampled set signifying a | |
3924 | * stripe with in flight i/o. The bypass_count will be reset when the | |
3925 | * head of the hold_list has changed, i.e. the head was promoted to the | |
3926 | * handle_list. | |
3927 | */ | |
3928 | static struct stripe_head *__get_priority_stripe(raid5_conf_t *conf) | |
3929 | { | |
3930 | struct stripe_head *sh; | |
3931 | ||
3932 | pr_debug("%s: handle: %s hold: %s full_writes: %d bypass_count: %d\n", | |
3933 | __func__, | |
3934 | list_empty(&conf->handle_list) ? "empty" : "busy", | |
3935 | list_empty(&conf->hold_list) ? "empty" : "busy", | |
3936 | atomic_read(&conf->pending_full_writes), conf->bypass_count); | |
3937 | ||
3938 | if (!list_empty(&conf->handle_list)) { | |
3939 | sh = list_entry(conf->handle_list.next, typeof(*sh), lru); | |
3940 | ||
3941 | if (list_empty(&conf->hold_list)) | |
3942 | conf->bypass_count = 0; | |
3943 | else if (!test_bit(STRIPE_IO_STARTED, &sh->state)) { | |
3944 | if (conf->hold_list.next == conf->last_hold) | |
3945 | conf->bypass_count++; | |
3946 | else { | |
3947 | conf->last_hold = conf->hold_list.next; | |
3948 | conf->bypass_count -= conf->bypass_threshold; | |
3949 | if (conf->bypass_count < 0) | |
3950 | conf->bypass_count = 0; | |
3951 | } | |
3952 | } | |
3953 | } else if (!list_empty(&conf->hold_list) && | |
3954 | ((conf->bypass_threshold && | |
3955 | conf->bypass_count > conf->bypass_threshold) || | |
3956 | atomic_read(&conf->pending_full_writes) == 0)) { | |
3957 | sh = list_entry(conf->hold_list.next, | |
3958 | typeof(*sh), lru); | |
3959 | conf->bypass_count -= conf->bypass_threshold; | |
3960 | if (conf->bypass_count < 0) | |
3961 | conf->bypass_count = 0; | |
3962 | } else | |
3963 | return NULL; | |
3964 | ||
3965 | list_del_init(&sh->lru); | |
3966 | atomic_inc(&sh->count); | |
3967 | BUG_ON(atomic_read(&sh->count) != 1); | |
3968 | return sh; | |
3969 | } | |
f679623f | 3970 | |
21a52c6d | 3971 | static int make_request(mddev_t *mddev, struct bio * bi) |
1da177e4 | 3972 | { |
070ec55d | 3973 | raid5_conf_t *conf = mddev->private; |
911d4ee8 | 3974 | int dd_idx; |
1da177e4 LT |
3975 | sector_t new_sector; |
3976 | sector_t logical_sector, last_sector; | |
3977 | struct stripe_head *sh; | |
a362357b | 3978 | const int rw = bio_data_dir(bi); |
49077326 | 3979 | int remaining; |
1da177e4 | 3980 | |
7b6d91da | 3981 | if (unlikely(bi->bi_rw & REQ_HARDBARRIER)) { |
a2826aa9 N |
3982 | /* Drain all pending writes. We only really need |
3983 | * to ensure they have been submitted, but this is | |
3984 | * easier. | |
3985 | */ | |
3986 | mddev->pers->quiesce(mddev, 1); | |
3987 | mddev->pers->quiesce(mddev, 0); | |
3988 | md_barrier_request(mddev, bi); | |
e5dcdd80 N |
3989 | return 0; |
3990 | } | |
3991 | ||
3d310eb7 | 3992 | md_write_start(mddev, bi); |
06d91a5f | 3993 | |
802ba064 | 3994 | if (rw == READ && |
52488615 | 3995 | mddev->reshape_position == MaxSector && |
21a52c6d | 3996 | chunk_aligned_read(mddev,bi)) |
99c0fb5f | 3997 | return 0; |
52488615 | 3998 | |
1da177e4 LT |
3999 | logical_sector = bi->bi_sector & ~((sector_t)STRIPE_SECTORS-1); |
4000 | last_sector = bi->bi_sector + (bi->bi_size>>9); | |
4001 | bi->bi_next = NULL; | |
4002 | bi->bi_phys_segments = 1; /* over-loaded to count active stripes */ | |
06d91a5f | 4003 | |
1da177e4 LT |
4004 | for (;logical_sector < last_sector; logical_sector += STRIPE_SECTORS) { |
4005 | DEFINE_WAIT(w); | |
16a53ecc | 4006 | int disks, data_disks; |
b5663ba4 | 4007 | int previous; |
b578d55f | 4008 | |
7ecaa1e6 | 4009 | retry: |
b5663ba4 | 4010 | previous = 0; |
b0f9ec04 | 4011 | disks = conf->raid_disks; |
b578d55f | 4012 | prepare_to_wait(&conf->wait_for_overlap, &w, TASK_UNINTERRUPTIBLE); |
b0f9ec04 | 4013 | if (unlikely(conf->reshape_progress != MaxSector)) { |
fef9c61f | 4014 | /* spinlock is needed as reshape_progress may be |
df8e7f76 N |
4015 | * 64bit on a 32bit platform, and so it might be |
4016 | * possible to see a half-updated value | |
fef9c61f | 4017 | * Ofcourse reshape_progress could change after |
df8e7f76 N |
4018 | * the lock is dropped, so once we get a reference |
4019 | * to the stripe that we think it is, we will have | |
4020 | * to check again. | |
4021 | */ | |
7ecaa1e6 | 4022 | spin_lock_irq(&conf->device_lock); |
fef9c61f N |
4023 | if (mddev->delta_disks < 0 |
4024 | ? logical_sector < conf->reshape_progress | |
4025 | : logical_sector >= conf->reshape_progress) { | |
7ecaa1e6 | 4026 | disks = conf->previous_raid_disks; |
b5663ba4 N |
4027 | previous = 1; |
4028 | } else { | |
fef9c61f N |
4029 | if (mddev->delta_disks < 0 |
4030 | ? logical_sector < conf->reshape_safe | |
4031 | : logical_sector >= conf->reshape_safe) { | |
b578d55f N |
4032 | spin_unlock_irq(&conf->device_lock); |
4033 | schedule(); | |
4034 | goto retry; | |
4035 | } | |
4036 | } | |
7ecaa1e6 N |
4037 | spin_unlock_irq(&conf->device_lock); |
4038 | } | |
16a53ecc N |
4039 | data_disks = disks - conf->max_degraded; |
4040 | ||
112bf897 N |
4041 | new_sector = raid5_compute_sector(conf, logical_sector, |
4042 | previous, | |
911d4ee8 | 4043 | &dd_idx, NULL); |
0c55e022 | 4044 | pr_debug("raid456: make_request, sector %llu logical %llu\n", |
1da177e4 LT |
4045 | (unsigned long long)new_sector, |
4046 | (unsigned long long)logical_sector); | |
4047 | ||
b5663ba4 | 4048 | sh = get_active_stripe(conf, new_sector, previous, |
a8c906ca | 4049 | (bi->bi_rw&RWA_MASK), 0); |
1da177e4 | 4050 | if (sh) { |
b0f9ec04 | 4051 | if (unlikely(previous)) { |
7ecaa1e6 | 4052 | /* expansion might have moved on while waiting for a |
df8e7f76 N |
4053 | * stripe, so we must do the range check again. |
4054 | * Expansion could still move past after this | |
4055 | * test, but as we are holding a reference to | |
4056 | * 'sh', we know that if that happens, | |
4057 | * STRIPE_EXPANDING will get set and the expansion | |
4058 | * won't proceed until we finish with the stripe. | |
7ecaa1e6 N |
4059 | */ |
4060 | int must_retry = 0; | |
4061 | spin_lock_irq(&conf->device_lock); | |
b0f9ec04 N |
4062 | if (mddev->delta_disks < 0 |
4063 | ? logical_sector >= conf->reshape_progress | |
4064 | : logical_sector < conf->reshape_progress) | |
7ecaa1e6 N |
4065 | /* mismatch, need to try again */ |
4066 | must_retry = 1; | |
4067 | spin_unlock_irq(&conf->device_lock); | |
4068 | if (must_retry) { | |
4069 | release_stripe(sh); | |
7a3ab908 | 4070 | schedule(); |
7ecaa1e6 N |
4071 | goto retry; |
4072 | } | |
4073 | } | |
e62e58a5 | 4074 | |
a5c308d4 N |
4075 | if (bio_data_dir(bi) == WRITE && |
4076 | logical_sector >= mddev->suspend_lo && | |
e464eafd N |
4077 | logical_sector < mddev->suspend_hi) { |
4078 | release_stripe(sh); | |
e62e58a5 N |
4079 | /* As the suspend_* range is controlled by |
4080 | * userspace, we want an interruptible | |
4081 | * wait. | |
4082 | */ | |
4083 | flush_signals(current); | |
4084 | prepare_to_wait(&conf->wait_for_overlap, | |
4085 | &w, TASK_INTERRUPTIBLE); | |
4086 | if (logical_sector >= mddev->suspend_lo && | |
4087 | logical_sector < mddev->suspend_hi) | |
4088 | schedule(); | |
e464eafd N |
4089 | goto retry; |
4090 | } | |
7ecaa1e6 N |
4091 | |
4092 | if (test_bit(STRIPE_EXPANDING, &sh->state) || | |
4093 | !add_stripe_bio(sh, bi, dd_idx, (bi->bi_rw&RW_MASK))) { | |
4094 | /* Stripe is busy expanding or | |
4095 | * add failed due to overlap. Flush everything | |
1da177e4 LT |
4096 | * and wait a while |
4097 | */ | |
9f7c2220 | 4098 | md_raid5_unplug_device(conf); |
1da177e4 LT |
4099 | release_stripe(sh); |
4100 | schedule(); | |
4101 | goto retry; | |
4102 | } | |
4103 | finish_wait(&conf->wait_for_overlap, &w); | |
6ed3003c N |
4104 | set_bit(STRIPE_HANDLE, &sh->state); |
4105 | clear_bit(STRIPE_DELAYED, &sh->state); | |
729a1866 N |
4106 | if (mddev->barrier && |
4107 | !test_and_set_bit(STRIPE_PREREAD_ACTIVE, &sh->state)) | |
4108 | atomic_inc(&conf->preread_active_stripes); | |
1da177e4 | 4109 | release_stripe(sh); |
1da177e4 LT |
4110 | } else { |
4111 | /* cannot get stripe for read-ahead, just give-up */ | |
4112 | clear_bit(BIO_UPTODATE, &bi->bi_flags); | |
4113 | finish_wait(&conf->wait_for_overlap, &w); | |
4114 | break; | |
4115 | } | |
4116 | ||
4117 | } | |
4118 | spin_lock_irq(&conf->device_lock); | |
960e739d | 4119 | remaining = raid5_dec_bi_phys_segments(bi); |
f6344757 N |
4120 | spin_unlock_irq(&conf->device_lock); |
4121 | if (remaining == 0) { | |
1da177e4 | 4122 | |
16a53ecc | 4123 | if ( rw == WRITE ) |
1da177e4 | 4124 | md_write_end(mddev); |
6712ecf8 | 4125 | |
0e13fe23 | 4126 | bio_endio(bi, 0); |
1da177e4 | 4127 | } |
729a1866 N |
4128 | |
4129 | if (mddev->barrier) { | |
4130 | /* We need to wait for the stripes to all be handled. | |
4131 | * So: wait for preread_active_stripes to drop to 0. | |
4132 | */ | |
4133 | wait_event(mddev->thread->wqueue, | |
4134 | atomic_read(&conf->preread_active_stripes) == 0); | |
4135 | } | |
1da177e4 LT |
4136 | return 0; |
4137 | } | |
4138 | ||
b522adcd DW |
4139 | static sector_t raid5_size(mddev_t *mddev, sector_t sectors, int raid_disks); |
4140 | ||
52c03291 | 4141 | static sector_t reshape_request(mddev_t *mddev, sector_t sector_nr, int *skipped) |
1da177e4 | 4142 | { |
52c03291 N |
4143 | /* reshaping is quite different to recovery/resync so it is |
4144 | * handled quite separately ... here. | |
4145 | * | |
4146 | * On each call to sync_request, we gather one chunk worth of | |
4147 | * destination stripes and flag them as expanding. | |
4148 | * Then we find all the source stripes and request reads. | |
4149 | * As the reads complete, handle_stripe will copy the data | |
4150 | * into the destination stripe and release that stripe. | |
4151 | */ | |
7b92813c | 4152 | raid5_conf_t *conf = mddev->private; |
1da177e4 | 4153 | struct stripe_head *sh; |
ccfcc3c1 | 4154 | sector_t first_sector, last_sector; |
f416885e N |
4155 | int raid_disks = conf->previous_raid_disks; |
4156 | int data_disks = raid_disks - conf->max_degraded; | |
4157 | int new_data_disks = conf->raid_disks - conf->max_degraded; | |
52c03291 N |
4158 | int i; |
4159 | int dd_idx; | |
c8f517c4 | 4160 | sector_t writepos, readpos, safepos; |
ec32a2bd | 4161 | sector_t stripe_addr; |
7a661381 | 4162 | int reshape_sectors; |
ab69ae12 | 4163 | struct list_head stripes; |
52c03291 | 4164 | |
fef9c61f N |
4165 | if (sector_nr == 0) { |
4166 | /* If restarting in the middle, skip the initial sectors */ | |
4167 | if (mddev->delta_disks < 0 && | |
4168 | conf->reshape_progress < raid5_size(mddev, 0, 0)) { | |
4169 | sector_nr = raid5_size(mddev, 0, 0) | |
4170 | - conf->reshape_progress; | |
a639755c | 4171 | } else if (mddev->delta_disks >= 0 && |
fef9c61f N |
4172 | conf->reshape_progress > 0) |
4173 | sector_nr = conf->reshape_progress; | |
f416885e | 4174 | sector_div(sector_nr, new_data_disks); |
fef9c61f | 4175 | if (sector_nr) { |
8dee7211 N |
4176 | mddev->curr_resync_completed = sector_nr; |
4177 | sysfs_notify(&mddev->kobj, NULL, "sync_completed"); | |
fef9c61f N |
4178 | *skipped = 1; |
4179 | return sector_nr; | |
4180 | } | |
52c03291 N |
4181 | } |
4182 | ||
7a661381 N |
4183 | /* We need to process a full chunk at a time. |
4184 | * If old and new chunk sizes differ, we need to process the | |
4185 | * largest of these | |
4186 | */ | |
664e7c41 AN |
4187 | if (mddev->new_chunk_sectors > mddev->chunk_sectors) |
4188 | reshape_sectors = mddev->new_chunk_sectors; | |
7a661381 | 4189 | else |
9d8f0363 | 4190 | reshape_sectors = mddev->chunk_sectors; |
7a661381 | 4191 | |
52c03291 N |
4192 | /* we update the metadata when there is more than 3Meg |
4193 | * in the block range (that is rather arbitrary, should | |
4194 | * probably be time based) or when the data about to be | |
4195 | * copied would over-write the source of the data at | |
4196 | * the front of the range. | |
fef9c61f N |
4197 | * i.e. one new_stripe along from reshape_progress new_maps |
4198 | * to after where reshape_safe old_maps to | |
52c03291 | 4199 | */ |
fef9c61f | 4200 | writepos = conf->reshape_progress; |
f416885e | 4201 | sector_div(writepos, new_data_disks); |
c8f517c4 N |
4202 | readpos = conf->reshape_progress; |
4203 | sector_div(readpos, data_disks); | |
fef9c61f | 4204 | safepos = conf->reshape_safe; |
f416885e | 4205 | sector_div(safepos, data_disks); |
fef9c61f | 4206 | if (mddev->delta_disks < 0) { |
ed37d83e | 4207 | writepos -= min_t(sector_t, reshape_sectors, writepos); |
c8f517c4 | 4208 | readpos += reshape_sectors; |
7a661381 | 4209 | safepos += reshape_sectors; |
fef9c61f | 4210 | } else { |
7a661381 | 4211 | writepos += reshape_sectors; |
ed37d83e N |
4212 | readpos -= min_t(sector_t, reshape_sectors, readpos); |
4213 | safepos -= min_t(sector_t, reshape_sectors, safepos); | |
fef9c61f | 4214 | } |
52c03291 | 4215 | |
c8f517c4 N |
4216 | /* 'writepos' is the most advanced device address we might write. |
4217 | * 'readpos' is the least advanced device address we might read. | |
4218 | * 'safepos' is the least address recorded in the metadata as having | |
4219 | * been reshaped. | |
4220 | * If 'readpos' is behind 'writepos', then there is no way that we can | |
4221 | * ensure safety in the face of a crash - that must be done by userspace | |
4222 | * making a backup of the data. So in that case there is no particular | |
4223 | * rush to update metadata. | |
4224 | * Otherwise if 'safepos' is behind 'writepos', then we really need to | |
4225 | * update the metadata to advance 'safepos' to match 'readpos' so that | |
4226 | * we can be safe in the event of a crash. | |
4227 | * So we insist on updating metadata if safepos is behind writepos and | |
4228 | * readpos is beyond writepos. | |
4229 | * In any case, update the metadata every 10 seconds. | |
4230 | * Maybe that number should be configurable, but I'm not sure it is | |
4231 | * worth it.... maybe it could be a multiple of safemode_delay??? | |
4232 | */ | |
fef9c61f | 4233 | if ((mddev->delta_disks < 0 |
c8f517c4 N |
4234 | ? (safepos > writepos && readpos < writepos) |
4235 | : (safepos < writepos && readpos > writepos)) || | |
4236 | time_after(jiffies, conf->reshape_checkpoint + 10*HZ)) { | |
52c03291 N |
4237 | /* Cannot proceed until we've updated the superblock... */ |
4238 | wait_event(conf->wait_for_overlap, | |
4239 | atomic_read(&conf->reshape_stripes)==0); | |
fef9c61f | 4240 | mddev->reshape_position = conf->reshape_progress; |
acb180b0 | 4241 | mddev->curr_resync_completed = mddev->curr_resync; |
c8f517c4 | 4242 | conf->reshape_checkpoint = jiffies; |
850b2b42 | 4243 | set_bit(MD_CHANGE_DEVS, &mddev->flags); |
52c03291 | 4244 | md_wakeup_thread(mddev->thread); |
850b2b42 | 4245 | wait_event(mddev->sb_wait, mddev->flags == 0 || |
52c03291 N |
4246 | kthread_should_stop()); |
4247 | spin_lock_irq(&conf->device_lock); | |
fef9c61f | 4248 | conf->reshape_safe = mddev->reshape_position; |
52c03291 N |
4249 | spin_unlock_irq(&conf->device_lock); |
4250 | wake_up(&conf->wait_for_overlap); | |
acb180b0 | 4251 | sysfs_notify(&mddev->kobj, NULL, "sync_completed"); |
52c03291 N |
4252 | } |
4253 | ||
ec32a2bd N |
4254 | if (mddev->delta_disks < 0) { |
4255 | BUG_ON(conf->reshape_progress == 0); | |
4256 | stripe_addr = writepos; | |
4257 | BUG_ON((mddev->dev_sectors & | |
7a661381 N |
4258 | ~((sector_t)reshape_sectors - 1)) |
4259 | - reshape_sectors - stripe_addr | |
ec32a2bd N |
4260 | != sector_nr); |
4261 | } else { | |
7a661381 | 4262 | BUG_ON(writepos != sector_nr + reshape_sectors); |
ec32a2bd N |
4263 | stripe_addr = sector_nr; |
4264 | } | |
ab69ae12 | 4265 | INIT_LIST_HEAD(&stripes); |
7a661381 | 4266 | for (i = 0; i < reshape_sectors; i += STRIPE_SECTORS) { |
52c03291 | 4267 | int j; |
a9f326eb | 4268 | int skipped_disk = 0; |
a8c906ca | 4269 | sh = get_active_stripe(conf, stripe_addr+i, 0, 0, 1); |
52c03291 N |
4270 | set_bit(STRIPE_EXPANDING, &sh->state); |
4271 | atomic_inc(&conf->reshape_stripes); | |
4272 | /* If any of this stripe is beyond the end of the old | |
4273 | * array, then we need to zero those blocks | |
4274 | */ | |
4275 | for (j=sh->disks; j--;) { | |
4276 | sector_t s; | |
4277 | if (j == sh->pd_idx) | |
4278 | continue; | |
f416885e | 4279 | if (conf->level == 6 && |
d0dabf7e | 4280 | j == sh->qd_idx) |
f416885e | 4281 | continue; |
784052ec | 4282 | s = compute_blocknr(sh, j, 0); |
b522adcd | 4283 | if (s < raid5_size(mddev, 0, 0)) { |
a9f326eb | 4284 | skipped_disk = 1; |
52c03291 N |
4285 | continue; |
4286 | } | |
4287 | memset(page_address(sh->dev[j].page), 0, STRIPE_SIZE); | |
4288 | set_bit(R5_Expanded, &sh->dev[j].flags); | |
4289 | set_bit(R5_UPTODATE, &sh->dev[j].flags); | |
4290 | } | |
a9f326eb | 4291 | if (!skipped_disk) { |
52c03291 N |
4292 | set_bit(STRIPE_EXPAND_READY, &sh->state); |
4293 | set_bit(STRIPE_HANDLE, &sh->state); | |
4294 | } | |
ab69ae12 | 4295 | list_add(&sh->lru, &stripes); |
52c03291 N |
4296 | } |
4297 | spin_lock_irq(&conf->device_lock); | |
fef9c61f | 4298 | if (mddev->delta_disks < 0) |
7a661381 | 4299 | conf->reshape_progress -= reshape_sectors * new_data_disks; |
fef9c61f | 4300 | else |
7a661381 | 4301 | conf->reshape_progress += reshape_sectors * new_data_disks; |
52c03291 N |
4302 | spin_unlock_irq(&conf->device_lock); |
4303 | /* Ok, those stripe are ready. We can start scheduling | |
4304 | * reads on the source stripes. | |
4305 | * The source stripes are determined by mapping the first and last | |
4306 | * block on the destination stripes. | |
4307 | */ | |
52c03291 | 4308 | first_sector = |
ec32a2bd | 4309 | raid5_compute_sector(conf, stripe_addr*(new_data_disks), |
911d4ee8 | 4310 | 1, &dd_idx, NULL); |
52c03291 | 4311 | last_sector = |
0e6e0271 | 4312 | raid5_compute_sector(conf, ((stripe_addr+reshape_sectors) |
09c9e5fa | 4313 | * new_data_disks - 1), |
911d4ee8 | 4314 | 1, &dd_idx, NULL); |
58c0fed4 AN |
4315 | if (last_sector >= mddev->dev_sectors) |
4316 | last_sector = mddev->dev_sectors - 1; | |
52c03291 | 4317 | while (first_sector <= last_sector) { |
a8c906ca | 4318 | sh = get_active_stripe(conf, first_sector, 1, 0, 1); |
52c03291 N |
4319 | set_bit(STRIPE_EXPAND_SOURCE, &sh->state); |
4320 | set_bit(STRIPE_HANDLE, &sh->state); | |
4321 | release_stripe(sh); | |
4322 | first_sector += STRIPE_SECTORS; | |
4323 | } | |
ab69ae12 N |
4324 | /* Now that the sources are clearly marked, we can release |
4325 | * the destination stripes | |
4326 | */ | |
4327 | while (!list_empty(&stripes)) { | |
4328 | sh = list_entry(stripes.next, struct stripe_head, lru); | |
4329 | list_del_init(&sh->lru); | |
4330 | release_stripe(sh); | |
4331 | } | |
c6207277 N |
4332 | /* If this takes us to the resync_max point where we have to pause, |
4333 | * then we need to write out the superblock. | |
4334 | */ | |
7a661381 | 4335 | sector_nr += reshape_sectors; |
c03f6a19 N |
4336 | if ((sector_nr - mddev->curr_resync_completed) * 2 |
4337 | >= mddev->resync_max - mddev->curr_resync_completed) { | |
c6207277 N |
4338 | /* Cannot proceed until we've updated the superblock... */ |
4339 | wait_event(conf->wait_for_overlap, | |
4340 | atomic_read(&conf->reshape_stripes) == 0); | |
fef9c61f | 4341 | mddev->reshape_position = conf->reshape_progress; |
48606a9f | 4342 | mddev->curr_resync_completed = mddev->curr_resync + reshape_sectors; |
c8f517c4 | 4343 | conf->reshape_checkpoint = jiffies; |
c6207277 N |
4344 | set_bit(MD_CHANGE_DEVS, &mddev->flags); |
4345 | md_wakeup_thread(mddev->thread); | |
4346 | wait_event(mddev->sb_wait, | |
4347 | !test_bit(MD_CHANGE_DEVS, &mddev->flags) | |
4348 | || kthread_should_stop()); | |
4349 | spin_lock_irq(&conf->device_lock); | |
fef9c61f | 4350 | conf->reshape_safe = mddev->reshape_position; |
c6207277 N |
4351 | spin_unlock_irq(&conf->device_lock); |
4352 | wake_up(&conf->wait_for_overlap); | |
acb180b0 | 4353 | sysfs_notify(&mddev->kobj, NULL, "sync_completed"); |
c6207277 | 4354 | } |
7a661381 | 4355 | return reshape_sectors; |
52c03291 N |
4356 | } |
4357 | ||
4358 | /* FIXME go_faster isn't used */ | |
4359 | static inline sector_t sync_request(mddev_t *mddev, sector_t sector_nr, int *skipped, int go_faster) | |
4360 | { | |
7b92813c | 4361 | raid5_conf_t *conf = mddev->private; |
52c03291 | 4362 | struct stripe_head *sh; |
58c0fed4 | 4363 | sector_t max_sector = mddev->dev_sectors; |
72626685 | 4364 | int sync_blocks; |
16a53ecc N |
4365 | int still_degraded = 0; |
4366 | int i; | |
1da177e4 | 4367 | |
72626685 | 4368 | if (sector_nr >= max_sector) { |
1da177e4 LT |
4369 | /* just being told to finish up .. nothing much to do */ |
4370 | unplug_slaves(mddev); | |
cea9c228 | 4371 | |
29269553 N |
4372 | if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)) { |
4373 | end_reshape(conf); | |
4374 | return 0; | |
4375 | } | |
72626685 N |
4376 | |
4377 | if (mddev->curr_resync < max_sector) /* aborted */ | |
4378 | bitmap_end_sync(mddev->bitmap, mddev->curr_resync, | |
4379 | &sync_blocks, 1); | |
16a53ecc | 4380 | else /* completed sync */ |
72626685 N |
4381 | conf->fullsync = 0; |
4382 | bitmap_close_sync(mddev->bitmap); | |
4383 | ||
1da177e4 LT |
4384 | return 0; |
4385 | } | |
ccfcc3c1 | 4386 | |
64bd660b N |
4387 | /* Allow raid5_quiesce to complete */ |
4388 | wait_event(conf->wait_for_overlap, conf->quiesce != 2); | |
4389 | ||
52c03291 N |
4390 | if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)) |
4391 | return reshape_request(mddev, sector_nr, skipped); | |
f6705578 | 4392 | |
c6207277 N |
4393 | /* No need to check resync_max as we never do more than one |
4394 | * stripe, and as resync_max will always be on a chunk boundary, | |
4395 | * if the check in md_do_sync didn't fire, there is no chance | |
4396 | * of overstepping resync_max here | |
4397 | */ | |
4398 | ||
16a53ecc | 4399 | /* if there is too many failed drives and we are trying |
1da177e4 LT |
4400 | * to resync, then assert that we are finished, because there is |
4401 | * nothing we can do. | |
4402 | */ | |
3285edf1 | 4403 | if (mddev->degraded >= conf->max_degraded && |
16a53ecc | 4404 | test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) { |
58c0fed4 | 4405 | sector_t rv = mddev->dev_sectors - sector_nr; |
57afd89f | 4406 | *skipped = 1; |
1da177e4 LT |
4407 | return rv; |
4408 | } | |
72626685 | 4409 | if (!bitmap_start_sync(mddev->bitmap, sector_nr, &sync_blocks, 1) && |
3855ad9f | 4410 | !test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery) && |
72626685 N |
4411 | !conf->fullsync && sync_blocks >= STRIPE_SECTORS) { |
4412 | /* we can skip this block, and probably more */ | |
4413 | sync_blocks /= STRIPE_SECTORS; | |
4414 | *skipped = 1; | |
4415 | return sync_blocks * STRIPE_SECTORS; /* keep things rounded to whole stripes */ | |
4416 | } | |
1da177e4 | 4417 | |
b47490c9 N |
4418 | |
4419 | bitmap_cond_end_sync(mddev->bitmap, sector_nr); | |
4420 | ||
a8c906ca | 4421 | sh = get_active_stripe(conf, sector_nr, 0, 1, 0); |
1da177e4 | 4422 | if (sh == NULL) { |
a8c906ca | 4423 | sh = get_active_stripe(conf, sector_nr, 0, 0, 0); |
1da177e4 | 4424 | /* make sure we don't swamp the stripe cache if someone else |
16a53ecc | 4425 | * is trying to get access |
1da177e4 | 4426 | */ |
66c006a5 | 4427 | schedule_timeout_uninterruptible(1); |
1da177e4 | 4428 | } |
16a53ecc N |
4429 | /* Need to check if array will still be degraded after recovery/resync |
4430 | * We don't need to check the 'failed' flag as when that gets set, | |
4431 | * recovery aborts. | |
4432 | */ | |
f001a70c | 4433 | for (i = 0; i < conf->raid_disks; i++) |
16a53ecc N |
4434 | if (conf->disks[i].rdev == NULL) |
4435 | still_degraded = 1; | |
4436 | ||
4437 | bitmap_start_sync(mddev->bitmap, sector_nr, &sync_blocks, still_degraded); | |
4438 | ||
4439 | spin_lock(&sh->lock); | |
1da177e4 LT |
4440 | set_bit(STRIPE_SYNCING, &sh->state); |
4441 | clear_bit(STRIPE_INSYNC, &sh->state); | |
4442 | spin_unlock(&sh->lock); | |
4443 | ||
1442577b | 4444 | handle_stripe(sh); |
1da177e4 LT |
4445 | release_stripe(sh); |
4446 | ||
4447 | return STRIPE_SECTORS; | |
4448 | } | |
4449 | ||
46031f9a RBJ |
4450 | static int retry_aligned_read(raid5_conf_t *conf, struct bio *raid_bio) |
4451 | { | |
4452 | /* We may not be able to submit a whole bio at once as there | |
4453 | * may not be enough stripe_heads available. | |
4454 | * We cannot pre-allocate enough stripe_heads as we may need | |
4455 | * more than exist in the cache (if we allow ever large chunks). | |
4456 | * So we do one stripe head at a time and record in | |
4457 | * ->bi_hw_segments how many have been done. | |
4458 | * | |
4459 | * We *know* that this entire raid_bio is in one chunk, so | |
4460 | * it will be only one 'dd_idx' and only need one call to raid5_compute_sector. | |
4461 | */ | |
4462 | struct stripe_head *sh; | |
911d4ee8 | 4463 | int dd_idx; |
46031f9a RBJ |
4464 | sector_t sector, logical_sector, last_sector; |
4465 | int scnt = 0; | |
4466 | int remaining; | |
4467 | int handled = 0; | |
4468 | ||
4469 | logical_sector = raid_bio->bi_sector & ~((sector_t)STRIPE_SECTORS-1); | |
112bf897 | 4470 | sector = raid5_compute_sector(conf, logical_sector, |
911d4ee8 | 4471 | 0, &dd_idx, NULL); |
46031f9a RBJ |
4472 | last_sector = raid_bio->bi_sector + (raid_bio->bi_size>>9); |
4473 | ||
4474 | for (; logical_sector < last_sector; | |
387bb173 NB |
4475 | logical_sector += STRIPE_SECTORS, |
4476 | sector += STRIPE_SECTORS, | |
4477 | scnt++) { | |
46031f9a | 4478 | |
960e739d | 4479 | if (scnt < raid5_bi_hw_segments(raid_bio)) |
46031f9a RBJ |
4480 | /* already done this stripe */ |
4481 | continue; | |
4482 | ||
a8c906ca | 4483 | sh = get_active_stripe(conf, sector, 0, 1, 0); |
46031f9a RBJ |
4484 | |
4485 | if (!sh) { | |
4486 | /* failed to get a stripe - must wait */ | |
960e739d | 4487 | raid5_set_bi_hw_segments(raid_bio, scnt); |
46031f9a RBJ |
4488 | conf->retry_read_aligned = raid_bio; |
4489 | return handled; | |
4490 | } | |
4491 | ||
4492 | set_bit(R5_ReadError, &sh->dev[dd_idx].flags); | |
387bb173 NB |
4493 | if (!add_stripe_bio(sh, raid_bio, dd_idx, 0)) { |
4494 | release_stripe(sh); | |
960e739d | 4495 | raid5_set_bi_hw_segments(raid_bio, scnt); |
387bb173 NB |
4496 | conf->retry_read_aligned = raid_bio; |
4497 | return handled; | |
4498 | } | |
4499 | ||
36d1c647 | 4500 | handle_stripe(sh); |
46031f9a RBJ |
4501 | release_stripe(sh); |
4502 | handled++; | |
4503 | } | |
4504 | spin_lock_irq(&conf->device_lock); | |
960e739d | 4505 | remaining = raid5_dec_bi_phys_segments(raid_bio); |
46031f9a | 4506 | spin_unlock_irq(&conf->device_lock); |
0e13fe23 NB |
4507 | if (remaining == 0) |
4508 | bio_endio(raid_bio, 0); | |
46031f9a RBJ |
4509 | if (atomic_dec_and_test(&conf->active_aligned_reads)) |
4510 | wake_up(&conf->wait_for_stripe); | |
4511 | return handled; | |
4512 | } | |
4513 | ||
46031f9a | 4514 | |
1da177e4 LT |
4515 | /* |
4516 | * This is our raid5 kernel thread. | |
4517 | * | |
4518 | * We scan the hash table for stripes which can be handled now. | |
4519 | * During the scan, completed stripes are saved for us by the interrupt | |
4520 | * handler, so that they will not have to wait for our next wakeup. | |
4521 | */ | |
6ed3003c | 4522 | static void raid5d(mddev_t *mddev) |
1da177e4 LT |
4523 | { |
4524 | struct stripe_head *sh; | |
070ec55d | 4525 | raid5_conf_t *conf = mddev->private; |
1da177e4 LT |
4526 | int handled; |
4527 | ||
45b4233c | 4528 | pr_debug("+++ raid5d active\n"); |
1da177e4 LT |
4529 | |
4530 | md_check_recovery(mddev); | |
1da177e4 LT |
4531 | |
4532 | handled = 0; | |
4533 | spin_lock_irq(&conf->device_lock); | |
4534 | while (1) { | |
46031f9a | 4535 | struct bio *bio; |
1da177e4 | 4536 | |
ae3c20cc | 4537 | if (conf->seq_flush != conf->seq_write) { |
72626685 | 4538 | int seq = conf->seq_flush; |
700e432d | 4539 | spin_unlock_irq(&conf->device_lock); |
72626685 | 4540 | bitmap_unplug(mddev->bitmap); |
700e432d | 4541 | spin_lock_irq(&conf->device_lock); |
72626685 N |
4542 | conf->seq_write = seq; |
4543 | activate_bit_delay(conf); | |
4544 | } | |
4545 | ||
46031f9a RBJ |
4546 | while ((bio = remove_bio_from_retry(conf))) { |
4547 | int ok; | |
4548 | spin_unlock_irq(&conf->device_lock); | |
4549 | ok = retry_aligned_read(conf, bio); | |
4550 | spin_lock_irq(&conf->device_lock); | |
4551 | if (!ok) | |
4552 | break; | |
4553 | handled++; | |
4554 | } | |
4555 | ||
8b3e6cdc DW |
4556 | sh = __get_priority_stripe(conf); |
4557 | ||
c9f21aaf | 4558 | if (!sh) |
1da177e4 | 4559 | break; |
1da177e4 LT |
4560 | spin_unlock_irq(&conf->device_lock); |
4561 | ||
4562 | handled++; | |
417b8d4a DW |
4563 | handle_stripe(sh); |
4564 | release_stripe(sh); | |
4565 | cond_resched(); | |
1da177e4 LT |
4566 | |
4567 | spin_lock_irq(&conf->device_lock); | |
4568 | } | |
45b4233c | 4569 | pr_debug("%d stripes handled\n", handled); |
1da177e4 LT |
4570 | |
4571 | spin_unlock_irq(&conf->device_lock); | |
4572 | ||
c9f21aaf | 4573 | async_tx_issue_pending_all(); |
1da177e4 LT |
4574 | unplug_slaves(mddev); |
4575 | ||
45b4233c | 4576 | pr_debug("--- raid5d inactive\n"); |
1da177e4 LT |
4577 | } |
4578 | ||
3f294f4f | 4579 | static ssize_t |
007583c9 | 4580 | raid5_show_stripe_cache_size(mddev_t *mddev, char *page) |
3f294f4f | 4581 | { |
070ec55d | 4582 | raid5_conf_t *conf = mddev->private; |
96de1e66 N |
4583 | if (conf) |
4584 | return sprintf(page, "%d\n", conf->max_nr_stripes); | |
4585 | else | |
4586 | return 0; | |
3f294f4f N |
4587 | } |
4588 | ||
c41d4ac4 N |
4589 | int |
4590 | raid5_set_cache_size(mddev_t *mddev, int size) | |
3f294f4f | 4591 | { |
070ec55d | 4592 | raid5_conf_t *conf = mddev->private; |
b5470dc5 DW |
4593 | int err; |
4594 | ||
c41d4ac4 | 4595 | if (size <= 16 || size > 32768) |
3f294f4f | 4596 | return -EINVAL; |
c41d4ac4 | 4597 | while (size < conf->max_nr_stripes) { |
3f294f4f N |
4598 | if (drop_one_stripe(conf)) |
4599 | conf->max_nr_stripes--; | |
4600 | else | |
4601 | break; | |
4602 | } | |
b5470dc5 DW |
4603 | err = md_allow_write(mddev); |
4604 | if (err) | |
4605 | return err; | |
c41d4ac4 | 4606 | while (size > conf->max_nr_stripes) { |
3f294f4f N |
4607 | if (grow_one_stripe(conf)) |
4608 | conf->max_nr_stripes++; | |
4609 | else break; | |
4610 | } | |
c41d4ac4 N |
4611 | return 0; |
4612 | } | |
4613 | EXPORT_SYMBOL(raid5_set_cache_size); | |
4614 | ||
4615 | static ssize_t | |
4616 | raid5_store_stripe_cache_size(mddev_t *mddev, const char *page, size_t len) | |
4617 | { | |
4618 | raid5_conf_t *conf = mddev->private; | |
4619 | unsigned long new; | |
4620 | int err; | |
4621 | ||
4622 | if (len >= PAGE_SIZE) | |
4623 | return -EINVAL; | |
4624 | if (!conf) | |
4625 | return -ENODEV; | |
4626 | ||
4627 | if (strict_strtoul(page, 10, &new)) | |
4628 | return -EINVAL; | |
4629 | err = raid5_set_cache_size(mddev, new); | |
4630 | if (err) | |
4631 | return err; | |
3f294f4f N |
4632 | return len; |
4633 | } | |
007583c9 | 4634 | |
96de1e66 N |
4635 | static struct md_sysfs_entry |
4636 | raid5_stripecache_size = __ATTR(stripe_cache_size, S_IRUGO | S_IWUSR, | |
4637 | raid5_show_stripe_cache_size, | |
4638 | raid5_store_stripe_cache_size); | |
3f294f4f | 4639 | |
8b3e6cdc DW |
4640 | static ssize_t |
4641 | raid5_show_preread_threshold(mddev_t *mddev, char *page) | |
4642 | { | |
070ec55d | 4643 | raid5_conf_t *conf = mddev->private; |
8b3e6cdc DW |
4644 | if (conf) |
4645 | return sprintf(page, "%d\n", conf->bypass_threshold); | |
4646 | else | |
4647 | return 0; | |
4648 | } | |
4649 | ||
4650 | static ssize_t | |
4651 | raid5_store_preread_threshold(mddev_t *mddev, const char *page, size_t len) | |
4652 | { | |
070ec55d | 4653 | raid5_conf_t *conf = mddev->private; |
4ef197d8 | 4654 | unsigned long new; |
8b3e6cdc DW |
4655 | if (len >= PAGE_SIZE) |
4656 | return -EINVAL; | |
4657 | if (!conf) | |
4658 | return -ENODEV; | |
4659 | ||
4ef197d8 | 4660 | if (strict_strtoul(page, 10, &new)) |
8b3e6cdc | 4661 | return -EINVAL; |
4ef197d8 | 4662 | if (new > conf->max_nr_stripes) |
8b3e6cdc DW |
4663 | return -EINVAL; |
4664 | conf->bypass_threshold = new; | |
4665 | return len; | |
4666 | } | |
4667 | ||
4668 | static struct md_sysfs_entry | |
4669 | raid5_preread_bypass_threshold = __ATTR(preread_bypass_threshold, | |
4670 | S_IRUGO | S_IWUSR, | |
4671 | raid5_show_preread_threshold, | |
4672 | raid5_store_preread_threshold); | |
4673 | ||
3f294f4f | 4674 | static ssize_t |
96de1e66 | 4675 | stripe_cache_active_show(mddev_t *mddev, char *page) |
3f294f4f | 4676 | { |
070ec55d | 4677 | raid5_conf_t *conf = mddev->private; |
96de1e66 N |
4678 | if (conf) |
4679 | return sprintf(page, "%d\n", atomic_read(&conf->active_stripes)); | |
4680 | else | |
4681 | return 0; | |
3f294f4f N |
4682 | } |
4683 | ||
96de1e66 N |
4684 | static struct md_sysfs_entry |
4685 | raid5_stripecache_active = __ATTR_RO(stripe_cache_active); | |
3f294f4f | 4686 | |
007583c9 | 4687 | static struct attribute *raid5_attrs[] = { |
3f294f4f N |
4688 | &raid5_stripecache_size.attr, |
4689 | &raid5_stripecache_active.attr, | |
8b3e6cdc | 4690 | &raid5_preread_bypass_threshold.attr, |
3f294f4f N |
4691 | NULL, |
4692 | }; | |
007583c9 N |
4693 | static struct attribute_group raid5_attrs_group = { |
4694 | .name = NULL, | |
4695 | .attrs = raid5_attrs, | |
3f294f4f N |
4696 | }; |
4697 | ||
80c3a6ce DW |
4698 | static sector_t |
4699 | raid5_size(mddev_t *mddev, sector_t sectors, int raid_disks) | |
4700 | { | |
070ec55d | 4701 | raid5_conf_t *conf = mddev->private; |
80c3a6ce DW |
4702 | |
4703 | if (!sectors) | |
4704 | sectors = mddev->dev_sectors; | |
5e5e3e78 | 4705 | if (!raid_disks) |
7ec05478 | 4706 | /* size is defined by the smallest of previous and new size */ |
5e5e3e78 | 4707 | raid_disks = min(conf->raid_disks, conf->previous_raid_disks); |
80c3a6ce | 4708 | |
9d8f0363 | 4709 | sectors &= ~((sector_t)mddev->chunk_sectors - 1); |
664e7c41 | 4710 | sectors &= ~((sector_t)mddev->new_chunk_sectors - 1); |
80c3a6ce DW |
4711 | return sectors * (raid_disks - conf->max_degraded); |
4712 | } | |
4713 | ||
36d1c647 DW |
4714 | static void raid5_free_percpu(raid5_conf_t *conf) |
4715 | { | |
4716 | struct raid5_percpu *percpu; | |
4717 | unsigned long cpu; | |
4718 | ||
4719 | if (!conf->percpu) | |
4720 | return; | |
4721 | ||
4722 | get_online_cpus(); | |
4723 | for_each_possible_cpu(cpu) { | |
4724 | percpu = per_cpu_ptr(conf->percpu, cpu); | |
4725 | safe_put_page(percpu->spare_page); | |
d6f38f31 | 4726 | kfree(percpu->scribble); |
36d1c647 DW |
4727 | } |
4728 | #ifdef CONFIG_HOTPLUG_CPU | |
4729 | unregister_cpu_notifier(&conf->cpu_notify); | |
4730 | #endif | |
4731 | put_online_cpus(); | |
4732 | ||
4733 | free_percpu(conf->percpu); | |
4734 | } | |
4735 | ||
95fc17aa DW |
4736 | static void free_conf(raid5_conf_t *conf) |
4737 | { | |
4738 | shrink_stripes(conf); | |
36d1c647 | 4739 | raid5_free_percpu(conf); |
95fc17aa DW |
4740 | kfree(conf->disks); |
4741 | kfree(conf->stripe_hashtbl); | |
4742 | kfree(conf); | |
4743 | } | |
4744 | ||
36d1c647 DW |
4745 | #ifdef CONFIG_HOTPLUG_CPU |
4746 | static int raid456_cpu_notify(struct notifier_block *nfb, unsigned long action, | |
4747 | void *hcpu) | |
4748 | { | |
4749 | raid5_conf_t *conf = container_of(nfb, raid5_conf_t, cpu_notify); | |
4750 | long cpu = (long)hcpu; | |
4751 | struct raid5_percpu *percpu = per_cpu_ptr(conf->percpu, cpu); | |
4752 | ||
4753 | switch (action) { | |
4754 | case CPU_UP_PREPARE: | |
4755 | case CPU_UP_PREPARE_FROZEN: | |
d6f38f31 | 4756 | if (conf->level == 6 && !percpu->spare_page) |
36d1c647 | 4757 | percpu->spare_page = alloc_page(GFP_KERNEL); |
d6f38f31 DW |
4758 | if (!percpu->scribble) |
4759 | percpu->scribble = kmalloc(conf->scribble_len, GFP_KERNEL); | |
4760 | ||
4761 | if (!percpu->scribble || | |
4762 | (conf->level == 6 && !percpu->spare_page)) { | |
4763 | safe_put_page(percpu->spare_page); | |
4764 | kfree(percpu->scribble); | |
36d1c647 DW |
4765 | pr_err("%s: failed memory allocation for cpu%ld\n", |
4766 | __func__, cpu); | |
55af6bb5 | 4767 | return notifier_from_errno(-ENOMEM); |
36d1c647 DW |
4768 | } |
4769 | break; | |
4770 | case CPU_DEAD: | |
4771 | case CPU_DEAD_FROZEN: | |
4772 | safe_put_page(percpu->spare_page); | |
d6f38f31 | 4773 | kfree(percpu->scribble); |
36d1c647 | 4774 | percpu->spare_page = NULL; |
d6f38f31 | 4775 | percpu->scribble = NULL; |
36d1c647 DW |
4776 | break; |
4777 | default: | |
4778 | break; | |
4779 | } | |
4780 | return NOTIFY_OK; | |
4781 | } | |
4782 | #endif | |
4783 | ||
4784 | static int raid5_alloc_percpu(raid5_conf_t *conf) | |
4785 | { | |
4786 | unsigned long cpu; | |
4787 | struct page *spare_page; | |
a29d8b8e | 4788 | struct raid5_percpu __percpu *allcpus; |
d6f38f31 | 4789 | void *scribble; |
36d1c647 DW |
4790 | int err; |
4791 | ||
36d1c647 DW |
4792 | allcpus = alloc_percpu(struct raid5_percpu); |
4793 | if (!allcpus) | |
4794 | return -ENOMEM; | |
4795 | conf->percpu = allcpus; | |
4796 | ||
4797 | get_online_cpus(); | |
4798 | err = 0; | |
4799 | for_each_present_cpu(cpu) { | |
d6f38f31 DW |
4800 | if (conf->level == 6) { |
4801 | spare_page = alloc_page(GFP_KERNEL); | |
4802 | if (!spare_page) { | |
4803 | err = -ENOMEM; | |
4804 | break; | |
4805 | } | |
4806 | per_cpu_ptr(conf->percpu, cpu)->spare_page = spare_page; | |
4807 | } | |
5e5e3e78 | 4808 | scribble = kmalloc(conf->scribble_len, GFP_KERNEL); |
d6f38f31 | 4809 | if (!scribble) { |
36d1c647 DW |
4810 | err = -ENOMEM; |
4811 | break; | |
4812 | } | |
d6f38f31 | 4813 | per_cpu_ptr(conf->percpu, cpu)->scribble = scribble; |
36d1c647 DW |
4814 | } |
4815 | #ifdef CONFIG_HOTPLUG_CPU | |
4816 | conf->cpu_notify.notifier_call = raid456_cpu_notify; | |
4817 | conf->cpu_notify.priority = 0; | |
4818 | if (err == 0) | |
4819 | err = register_cpu_notifier(&conf->cpu_notify); | |
4820 | #endif | |
4821 | put_online_cpus(); | |
4822 | ||
4823 | return err; | |
4824 | } | |
4825 | ||
91adb564 | 4826 | static raid5_conf_t *setup_conf(mddev_t *mddev) |
1da177e4 LT |
4827 | { |
4828 | raid5_conf_t *conf; | |
5e5e3e78 | 4829 | int raid_disk, memory, max_disks; |
1da177e4 LT |
4830 | mdk_rdev_t *rdev; |
4831 | struct disk_info *disk; | |
1da177e4 | 4832 | |
91adb564 N |
4833 | if (mddev->new_level != 5 |
4834 | && mddev->new_level != 4 | |
4835 | && mddev->new_level != 6) { | |
0c55e022 | 4836 | printk(KERN_ERR "md/raid:%s: raid level not set to 4/5/6 (%d)\n", |
91adb564 N |
4837 | mdname(mddev), mddev->new_level); |
4838 | return ERR_PTR(-EIO); | |
1da177e4 | 4839 | } |
91adb564 N |
4840 | if ((mddev->new_level == 5 |
4841 | && !algorithm_valid_raid5(mddev->new_layout)) || | |
4842 | (mddev->new_level == 6 | |
4843 | && !algorithm_valid_raid6(mddev->new_layout))) { | |
0c55e022 | 4844 | printk(KERN_ERR "md/raid:%s: layout %d not supported\n", |
91adb564 N |
4845 | mdname(mddev), mddev->new_layout); |
4846 | return ERR_PTR(-EIO); | |
99c0fb5f | 4847 | } |
91adb564 | 4848 | if (mddev->new_level == 6 && mddev->raid_disks < 4) { |
0c55e022 | 4849 | printk(KERN_ERR "md/raid:%s: not enough configured devices (%d, minimum 4)\n", |
91adb564 N |
4850 | mdname(mddev), mddev->raid_disks); |
4851 | return ERR_PTR(-EINVAL); | |
4bbf3771 N |
4852 | } |
4853 | ||
664e7c41 AN |
4854 | if (!mddev->new_chunk_sectors || |
4855 | (mddev->new_chunk_sectors << 9) % PAGE_SIZE || | |
4856 | !is_power_of_2(mddev->new_chunk_sectors)) { | |
0c55e022 N |
4857 | printk(KERN_ERR "md/raid:%s: invalid chunk size %d\n", |
4858 | mdname(mddev), mddev->new_chunk_sectors << 9); | |
91adb564 | 4859 | return ERR_PTR(-EINVAL); |
f6705578 N |
4860 | } |
4861 | ||
91adb564 N |
4862 | conf = kzalloc(sizeof(raid5_conf_t), GFP_KERNEL); |
4863 | if (conf == NULL) | |
1da177e4 | 4864 | goto abort; |
f5efd45a DW |
4865 | spin_lock_init(&conf->device_lock); |
4866 | init_waitqueue_head(&conf->wait_for_stripe); | |
4867 | init_waitqueue_head(&conf->wait_for_overlap); | |
4868 | INIT_LIST_HEAD(&conf->handle_list); | |
4869 | INIT_LIST_HEAD(&conf->hold_list); | |
4870 | INIT_LIST_HEAD(&conf->delayed_list); | |
4871 | INIT_LIST_HEAD(&conf->bitmap_list); | |
4872 | INIT_LIST_HEAD(&conf->inactive_list); | |
4873 | atomic_set(&conf->active_stripes, 0); | |
4874 | atomic_set(&conf->preread_active_stripes, 0); | |
4875 | atomic_set(&conf->active_aligned_reads, 0); | |
4876 | conf->bypass_threshold = BYPASS_THRESHOLD; | |
91adb564 N |
4877 | |
4878 | conf->raid_disks = mddev->raid_disks; | |
4879 | if (mddev->reshape_position == MaxSector) | |
4880 | conf->previous_raid_disks = mddev->raid_disks; | |
4881 | else | |
f6705578 | 4882 | conf->previous_raid_disks = mddev->raid_disks - mddev->delta_disks; |
5e5e3e78 N |
4883 | max_disks = max(conf->raid_disks, conf->previous_raid_disks); |
4884 | conf->scribble_len = scribble_len(max_disks); | |
f6705578 | 4885 | |
5e5e3e78 | 4886 | conf->disks = kzalloc(max_disks * sizeof(struct disk_info), |
b55e6bfc N |
4887 | GFP_KERNEL); |
4888 | if (!conf->disks) | |
4889 | goto abort; | |
9ffae0cf | 4890 | |
1da177e4 LT |
4891 | conf->mddev = mddev; |
4892 | ||
fccddba0 | 4893 | if ((conf->stripe_hashtbl = kzalloc(PAGE_SIZE, GFP_KERNEL)) == NULL) |
1da177e4 | 4894 | goto abort; |
1da177e4 | 4895 | |
36d1c647 DW |
4896 | conf->level = mddev->new_level; |
4897 | if (raid5_alloc_percpu(conf) != 0) | |
4898 | goto abort; | |
4899 | ||
0c55e022 | 4900 | pr_debug("raid456: run(%s) called.\n", mdname(mddev)); |
1da177e4 | 4901 | |
159ec1fc | 4902 | list_for_each_entry(rdev, &mddev->disks, same_set) { |
1da177e4 | 4903 | raid_disk = rdev->raid_disk; |
5e5e3e78 | 4904 | if (raid_disk >= max_disks |
1da177e4 LT |
4905 | || raid_disk < 0) |
4906 | continue; | |
4907 | disk = conf->disks + raid_disk; | |
4908 | ||
4909 | disk->rdev = rdev; | |
4910 | ||
b2d444d7 | 4911 | if (test_bit(In_sync, &rdev->flags)) { |
1da177e4 | 4912 | char b[BDEVNAME_SIZE]; |
0c55e022 N |
4913 | printk(KERN_INFO "md/raid:%s: device %s operational as raid" |
4914 | " disk %d\n", | |
4915 | mdname(mddev), bdevname(rdev->bdev, b), raid_disk); | |
8c2e870a NB |
4916 | } else |
4917 | /* Cannot rely on bitmap to complete recovery */ | |
4918 | conf->fullsync = 1; | |
1da177e4 LT |
4919 | } |
4920 | ||
09c9e5fa | 4921 | conf->chunk_sectors = mddev->new_chunk_sectors; |
91adb564 | 4922 | conf->level = mddev->new_level; |
16a53ecc N |
4923 | if (conf->level == 6) |
4924 | conf->max_degraded = 2; | |
4925 | else | |
4926 | conf->max_degraded = 1; | |
91adb564 | 4927 | conf->algorithm = mddev->new_layout; |
1da177e4 | 4928 | conf->max_nr_stripes = NR_STRIPES; |
fef9c61f | 4929 | conf->reshape_progress = mddev->reshape_position; |
e183eaed | 4930 | if (conf->reshape_progress != MaxSector) { |
09c9e5fa | 4931 | conf->prev_chunk_sectors = mddev->chunk_sectors; |
e183eaed N |
4932 | conf->prev_algo = mddev->layout; |
4933 | } | |
1da177e4 | 4934 | |
91adb564 | 4935 | memory = conf->max_nr_stripes * (sizeof(struct stripe_head) + |
5e5e3e78 | 4936 | max_disks * ((sizeof(struct bio) + PAGE_SIZE))) / 1024; |
91adb564 N |
4937 | if (grow_stripes(conf, conf->max_nr_stripes)) { |
4938 | printk(KERN_ERR | |
0c55e022 N |
4939 | "md/raid:%s: couldn't allocate %dkB for buffers\n", |
4940 | mdname(mddev), memory); | |
91adb564 N |
4941 | goto abort; |
4942 | } else | |
0c55e022 N |
4943 | printk(KERN_INFO "md/raid:%s: allocated %dkB\n", |
4944 | mdname(mddev), memory); | |
1da177e4 | 4945 | |
0da3c619 | 4946 | conf->thread = md_register_thread(raid5d, mddev, NULL); |
91adb564 N |
4947 | if (!conf->thread) { |
4948 | printk(KERN_ERR | |
0c55e022 | 4949 | "md/raid:%s: couldn't allocate thread.\n", |
91adb564 | 4950 | mdname(mddev)); |
16a53ecc N |
4951 | goto abort; |
4952 | } | |
91adb564 N |
4953 | |
4954 | return conf; | |
4955 | ||
4956 | abort: | |
4957 | if (conf) { | |
95fc17aa | 4958 | free_conf(conf); |
91adb564 N |
4959 | return ERR_PTR(-EIO); |
4960 | } else | |
4961 | return ERR_PTR(-ENOMEM); | |
4962 | } | |
4963 | ||
c148ffdc N |
4964 | |
4965 | static int only_parity(int raid_disk, int algo, int raid_disks, int max_degraded) | |
4966 | { | |
4967 | switch (algo) { | |
4968 | case ALGORITHM_PARITY_0: | |
4969 | if (raid_disk < max_degraded) | |
4970 | return 1; | |
4971 | break; | |
4972 | case ALGORITHM_PARITY_N: | |
4973 | if (raid_disk >= raid_disks - max_degraded) | |
4974 | return 1; | |
4975 | break; | |
4976 | case ALGORITHM_PARITY_0_6: | |
4977 | if (raid_disk == 0 || | |
4978 | raid_disk == raid_disks - 1) | |
4979 | return 1; | |
4980 | break; | |
4981 | case ALGORITHM_LEFT_ASYMMETRIC_6: | |
4982 | case ALGORITHM_RIGHT_ASYMMETRIC_6: | |
4983 | case ALGORITHM_LEFT_SYMMETRIC_6: | |
4984 | case ALGORITHM_RIGHT_SYMMETRIC_6: | |
4985 | if (raid_disk == raid_disks - 1) | |
4986 | return 1; | |
4987 | } | |
4988 | return 0; | |
4989 | } | |
4990 | ||
91adb564 N |
4991 | static int run(mddev_t *mddev) |
4992 | { | |
4993 | raid5_conf_t *conf; | |
9f7c2220 | 4994 | int working_disks = 0; |
c148ffdc | 4995 | int dirty_parity_disks = 0; |
91adb564 | 4996 | mdk_rdev_t *rdev; |
c148ffdc | 4997 | sector_t reshape_offset = 0; |
91adb564 | 4998 | |
8c6ac868 | 4999 | if (mddev->recovery_cp != MaxSector) |
0c55e022 | 5000 | printk(KERN_NOTICE "md/raid:%s: not clean" |
8c6ac868 AN |
5001 | " -- starting background reconstruction\n", |
5002 | mdname(mddev)); | |
91adb564 N |
5003 | if (mddev->reshape_position != MaxSector) { |
5004 | /* Check that we can continue the reshape. | |
5005 | * Currently only disks can change, it must | |
5006 | * increase, and we must be past the point where | |
5007 | * a stripe over-writes itself | |
5008 | */ | |
5009 | sector_t here_new, here_old; | |
5010 | int old_disks; | |
18b00334 | 5011 | int max_degraded = (mddev->level == 6 ? 2 : 1); |
91adb564 | 5012 | |
88ce4930 | 5013 | if (mddev->new_level != mddev->level) { |
0c55e022 | 5014 | printk(KERN_ERR "md/raid:%s: unsupported reshape " |
91adb564 N |
5015 | "required - aborting.\n", |
5016 | mdname(mddev)); | |
5017 | return -EINVAL; | |
5018 | } | |
91adb564 N |
5019 | old_disks = mddev->raid_disks - mddev->delta_disks; |
5020 | /* reshape_position must be on a new-stripe boundary, and one | |
5021 | * further up in new geometry must map after here in old | |
5022 | * geometry. | |
5023 | */ | |
5024 | here_new = mddev->reshape_position; | |
664e7c41 | 5025 | if (sector_div(here_new, mddev->new_chunk_sectors * |
91adb564 | 5026 | (mddev->raid_disks - max_degraded))) { |
0c55e022 N |
5027 | printk(KERN_ERR "md/raid:%s: reshape_position not " |
5028 | "on a stripe boundary\n", mdname(mddev)); | |
91adb564 N |
5029 | return -EINVAL; |
5030 | } | |
c148ffdc | 5031 | reshape_offset = here_new * mddev->new_chunk_sectors; |
91adb564 N |
5032 | /* here_new is the stripe we will write to */ |
5033 | here_old = mddev->reshape_position; | |
9d8f0363 | 5034 | sector_div(here_old, mddev->chunk_sectors * |
91adb564 N |
5035 | (old_disks-max_degraded)); |
5036 | /* here_old is the first stripe that we might need to read | |
5037 | * from */ | |
67ac6011 N |
5038 | if (mddev->delta_disks == 0) { |
5039 | /* We cannot be sure it is safe to start an in-place | |
5040 | * reshape. It is only safe if user-space if monitoring | |
5041 | * and taking constant backups. | |
5042 | * mdadm always starts a situation like this in | |
5043 | * readonly mode so it can take control before | |
5044 | * allowing any writes. So just check for that. | |
5045 | */ | |
5046 | if ((here_new * mddev->new_chunk_sectors != | |
5047 | here_old * mddev->chunk_sectors) || | |
5048 | mddev->ro == 0) { | |
0c55e022 N |
5049 | printk(KERN_ERR "md/raid:%s: in-place reshape must be started" |
5050 | " in read-only mode - aborting\n", | |
5051 | mdname(mddev)); | |
67ac6011 N |
5052 | return -EINVAL; |
5053 | } | |
5054 | } else if (mddev->delta_disks < 0 | |
5055 | ? (here_new * mddev->new_chunk_sectors <= | |
5056 | here_old * mddev->chunk_sectors) | |
5057 | : (here_new * mddev->new_chunk_sectors >= | |
5058 | here_old * mddev->chunk_sectors)) { | |
91adb564 | 5059 | /* Reading from the same stripe as writing to - bad */ |
0c55e022 N |
5060 | printk(KERN_ERR "md/raid:%s: reshape_position too early for " |
5061 | "auto-recovery - aborting.\n", | |
5062 | mdname(mddev)); | |
91adb564 N |
5063 | return -EINVAL; |
5064 | } | |
0c55e022 N |
5065 | printk(KERN_INFO "md/raid:%s: reshape will continue\n", |
5066 | mdname(mddev)); | |
91adb564 N |
5067 | /* OK, we should be able to continue; */ |
5068 | } else { | |
5069 | BUG_ON(mddev->level != mddev->new_level); | |
5070 | BUG_ON(mddev->layout != mddev->new_layout); | |
664e7c41 | 5071 | BUG_ON(mddev->chunk_sectors != mddev->new_chunk_sectors); |
91adb564 | 5072 | BUG_ON(mddev->delta_disks != 0); |
1da177e4 | 5073 | } |
91adb564 | 5074 | |
245f46c2 N |
5075 | if (mddev->private == NULL) |
5076 | conf = setup_conf(mddev); | |
5077 | else | |
5078 | conf = mddev->private; | |
5079 | ||
91adb564 N |
5080 | if (IS_ERR(conf)) |
5081 | return PTR_ERR(conf); | |
5082 | ||
5083 | mddev->thread = conf->thread; | |
5084 | conf->thread = NULL; | |
5085 | mddev->private = conf; | |
5086 | ||
5087 | /* | |
5088 | * 0 for a fully functional array, 1 or 2 for a degraded array. | |
5089 | */ | |
c148ffdc N |
5090 | list_for_each_entry(rdev, &mddev->disks, same_set) { |
5091 | if (rdev->raid_disk < 0) | |
5092 | continue; | |
2f115882 | 5093 | if (test_bit(In_sync, &rdev->flags)) { |
91adb564 | 5094 | working_disks++; |
2f115882 N |
5095 | continue; |
5096 | } | |
c148ffdc N |
5097 | /* This disc is not fully in-sync. However if it |
5098 | * just stored parity (beyond the recovery_offset), | |
5099 | * when we don't need to be concerned about the | |
5100 | * array being dirty. | |
5101 | * When reshape goes 'backwards', we never have | |
5102 | * partially completed devices, so we only need | |
5103 | * to worry about reshape going forwards. | |
5104 | */ | |
5105 | /* Hack because v0.91 doesn't store recovery_offset properly. */ | |
5106 | if (mddev->major_version == 0 && | |
5107 | mddev->minor_version > 90) | |
5108 | rdev->recovery_offset = reshape_offset; | |
5109 | ||
c148ffdc N |
5110 | if (rdev->recovery_offset < reshape_offset) { |
5111 | /* We need to check old and new layout */ | |
5112 | if (!only_parity(rdev->raid_disk, | |
5113 | conf->algorithm, | |
5114 | conf->raid_disks, | |
5115 | conf->max_degraded)) | |
5116 | continue; | |
5117 | } | |
5118 | if (!only_parity(rdev->raid_disk, | |
5119 | conf->prev_algo, | |
5120 | conf->previous_raid_disks, | |
5121 | conf->max_degraded)) | |
5122 | continue; | |
5123 | dirty_parity_disks++; | |
5124 | } | |
91adb564 | 5125 | |
5e5e3e78 N |
5126 | mddev->degraded = (max(conf->raid_disks, conf->previous_raid_disks) |
5127 | - working_disks); | |
91adb564 | 5128 | |
674806d6 | 5129 | if (has_failed(conf)) { |
0c55e022 | 5130 | printk(KERN_ERR "md/raid:%s: not enough operational devices" |
1da177e4 | 5131 | " (%d/%d failed)\n", |
02c2de8c | 5132 | mdname(mddev), mddev->degraded, conf->raid_disks); |
1da177e4 LT |
5133 | goto abort; |
5134 | } | |
5135 | ||
91adb564 | 5136 | /* device size must be a multiple of chunk size */ |
9d8f0363 | 5137 | mddev->dev_sectors &= ~(mddev->chunk_sectors - 1); |
91adb564 N |
5138 | mddev->resync_max_sectors = mddev->dev_sectors; |
5139 | ||
c148ffdc | 5140 | if (mddev->degraded > dirty_parity_disks && |
1da177e4 | 5141 | mddev->recovery_cp != MaxSector) { |
6ff8d8ec N |
5142 | if (mddev->ok_start_degraded) |
5143 | printk(KERN_WARNING | |
0c55e022 N |
5144 | "md/raid:%s: starting dirty degraded array" |
5145 | " - data corruption possible.\n", | |
6ff8d8ec N |
5146 | mdname(mddev)); |
5147 | else { | |
5148 | printk(KERN_ERR | |
0c55e022 | 5149 | "md/raid:%s: cannot start dirty degraded array.\n", |
6ff8d8ec N |
5150 | mdname(mddev)); |
5151 | goto abort; | |
5152 | } | |
1da177e4 LT |
5153 | } |
5154 | ||
1da177e4 | 5155 | if (mddev->degraded == 0) |
0c55e022 N |
5156 | printk(KERN_INFO "md/raid:%s: raid level %d active with %d out of %d" |
5157 | " devices, algorithm %d\n", mdname(mddev), conf->level, | |
e183eaed N |
5158 | mddev->raid_disks-mddev->degraded, mddev->raid_disks, |
5159 | mddev->new_layout); | |
1da177e4 | 5160 | else |
0c55e022 N |
5161 | printk(KERN_ALERT "md/raid:%s: raid level %d active with %d" |
5162 | " out of %d devices, algorithm %d\n", | |
5163 | mdname(mddev), conf->level, | |
5164 | mddev->raid_disks - mddev->degraded, | |
5165 | mddev->raid_disks, mddev->new_layout); | |
1da177e4 LT |
5166 | |
5167 | print_raid5_conf(conf); | |
5168 | ||
fef9c61f | 5169 | if (conf->reshape_progress != MaxSector) { |
fef9c61f | 5170 | conf->reshape_safe = conf->reshape_progress; |
f6705578 N |
5171 | atomic_set(&conf->reshape_stripes, 0); |
5172 | clear_bit(MD_RECOVERY_SYNC, &mddev->recovery); | |
5173 | clear_bit(MD_RECOVERY_CHECK, &mddev->recovery); | |
5174 | set_bit(MD_RECOVERY_RESHAPE, &mddev->recovery); | |
5175 | set_bit(MD_RECOVERY_RUNNING, &mddev->recovery); | |
5176 | mddev->sync_thread = md_register_thread(md_do_sync, mddev, | |
0da3c619 | 5177 | "reshape"); |
f6705578 N |
5178 | } |
5179 | ||
1da177e4 LT |
5180 | |
5181 | /* Ok, everything is just fine now */ | |
a64c876f N |
5182 | if (mddev->to_remove == &raid5_attrs_group) |
5183 | mddev->to_remove = NULL; | |
00bcb4ac N |
5184 | else if (mddev->kobj.sd && |
5185 | sysfs_create_group(&mddev->kobj, &raid5_attrs_group)) | |
5e55e2f5 | 5186 | printk(KERN_WARNING |
4a5add49 | 5187 | "raid5: failed to create sysfs attributes for %s\n", |
5e55e2f5 | 5188 | mdname(mddev)); |
4a5add49 | 5189 | md_set_array_sectors(mddev, raid5_size(mddev, 0, 0)); |
7a5febe9 | 5190 | |
2ac87401 | 5191 | plugger_init(&conf->plug, raid5_unplug); |
252ac522 | 5192 | mddev->plug = &conf->plug; |
4a5add49 | 5193 | if (mddev->queue) { |
9f7c2220 | 5194 | int chunk_size; |
4a5add49 N |
5195 | /* read-ahead size must cover two whole stripes, which |
5196 | * is 2 * (datadisks) * chunksize where 'n' is the | |
5197 | * number of raid devices | |
5198 | */ | |
5199 | int data_disks = conf->previous_raid_disks - conf->max_degraded; | |
5200 | int stripe = data_disks * | |
5201 | ((mddev->chunk_sectors << 9) / PAGE_SIZE); | |
5202 | if (mddev->queue->backing_dev_info.ra_pages < 2 * stripe) | |
5203 | mddev->queue->backing_dev_info.ra_pages = 2 * stripe; | |
91adb564 | 5204 | |
4a5add49 | 5205 | blk_queue_merge_bvec(mddev->queue, raid5_mergeable_bvec); |
f022b2fd | 5206 | |
11d8a6e3 N |
5207 | mddev->queue->backing_dev_info.congested_data = mddev; |
5208 | mddev->queue->backing_dev_info.congested_fn = raid5_congested; | |
9f7c2220 N |
5209 | mddev->queue->queue_lock = &conf->device_lock; |
5210 | mddev->queue->unplug_fn = raid5_unplug_queue; | |
7a5febe9 | 5211 | |
9f7c2220 N |
5212 | chunk_size = mddev->chunk_sectors << 9; |
5213 | blk_queue_io_min(mddev->queue, chunk_size); | |
5214 | blk_queue_io_opt(mddev->queue, chunk_size * | |
5215 | (conf->raid_disks - conf->max_degraded)); | |
8f6c2e4b | 5216 | |
9f7c2220 N |
5217 | list_for_each_entry(rdev, &mddev->disks, same_set) |
5218 | disk_stack_limits(mddev->gendisk, rdev->bdev, | |
5219 | rdev->data_offset << 9); | |
5220 | } | |
23032a0e | 5221 | |
1da177e4 LT |
5222 | return 0; |
5223 | abort: | |
e0cf8f04 | 5224 | md_unregister_thread(mddev->thread); |
91adb564 | 5225 | mddev->thread = NULL; |
1da177e4 LT |
5226 | if (conf) { |
5227 | print_raid5_conf(conf); | |
95fc17aa | 5228 | free_conf(conf); |
1da177e4 LT |
5229 | } |
5230 | mddev->private = NULL; | |
0c55e022 | 5231 | printk(KERN_ALERT "md/raid:%s: failed to run raid set.\n", mdname(mddev)); |
1da177e4 LT |
5232 | return -EIO; |
5233 | } | |
5234 | ||
3f294f4f | 5235 | static int stop(mddev_t *mddev) |
1da177e4 | 5236 | { |
7b92813c | 5237 | raid5_conf_t *conf = mddev->private; |
1da177e4 LT |
5238 | |
5239 | md_unregister_thread(mddev->thread); | |
5240 | mddev->thread = NULL; | |
11d8a6e3 N |
5241 | if (mddev->queue) |
5242 | mddev->queue->backing_dev_info.congested_fn = NULL; | |
2ac87401 | 5243 | plugger_flush(&conf->plug); /* the unplug fn references 'conf'*/ |
95fc17aa | 5244 | free_conf(conf); |
a64c876f N |
5245 | mddev->private = NULL; |
5246 | mddev->to_remove = &raid5_attrs_group; | |
1da177e4 LT |
5247 | return 0; |
5248 | } | |
5249 | ||
45b4233c | 5250 | #ifdef DEBUG |
d710e138 | 5251 | static void print_sh(struct seq_file *seq, struct stripe_head *sh) |
1da177e4 LT |
5252 | { |
5253 | int i; | |
5254 | ||
16a53ecc N |
5255 | seq_printf(seq, "sh %llu, pd_idx %d, state %ld.\n", |
5256 | (unsigned long long)sh->sector, sh->pd_idx, sh->state); | |
5257 | seq_printf(seq, "sh %llu, count %d.\n", | |
5258 | (unsigned long long)sh->sector, atomic_read(&sh->count)); | |
5259 | seq_printf(seq, "sh %llu, ", (unsigned long long)sh->sector); | |
7ecaa1e6 | 5260 | for (i = 0; i < sh->disks; i++) { |
16a53ecc N |
5261 | seq_printf(seq, "(cache%d: %p %ld) ", |
5262 | i, sh->dev[i].page, sh->dev[i].flags); | |
1da177e4 | 5263 | } |
16a53ecc | 5264 | seq_printf(seq, "\n"); |
1da177e4 LT |
5265 | } |
5266 | ||
d710e138 | 5267 | static void printall(struct seq_file *seq, raid5_conf_t *conf) |
1da177e4 LT |
5268 | { |
5269 | struct stripe_head *sh; | |
fccddba0 | 5270 | struct hlist_node *hn; |
1da177e4 LT |
5271 | int i; |
5272 | ||
5273 | spin_lock_irq(&conf->device_lock); | |
5274 | for (i = 0; i < NR_HASH; i++) { | |
fccddba0 | 5275 | hlist_for_each_entry(sh, hn, &conf->stripe_hashtbl[i], hash) { |
1da177e4 LT |
5276 | if (sh->raid_conf != conf) |
5277 | continue; | |
16a53ecc | 5278 | print_sh(seq, sh); |
1da177e4 LT |
5279 | } |
5280 | } | |
5281 | spin_unlock_irq(&conf->device_lock); | |
5282 | } | |
5283 | #endif | |
5284 | ||
d710e138 | 5285 | static void status(struct seq_file *seq, mddev_t *mddev) |
1da177e4 | 5286 | { |
7b92813c | 5287 | raid5_conf_t *conf = mddev->private; |
1da177e4 LT |
5288 | int i; |
5289 | ||
9d8f0363 AN |
5290 | seq_printf(seq, " level %d, %dk chunk, algorithm %d", mddev->level, |
5291 | mddev->chunk_sectors / 2, mddev->layout); | |
02c2de8c | 5292 | seq_printf (seq, " [%d/%d] [", conf->raid_disks, conf->raid_disks - mddev->degraded); |
1da177e4 LT |
5293 | for (i = 0; i < conf->raid_disks; i++) |
5294 | seq_printf (seq, "%s", | |
5295 | conf->disks[i].rdev && | |
b2d444d7 | 5296 | test_bit(In_sync, &conf->disks[i].rdev->flags) ? "U" : "_"); |
1da177e4 | 5297 | seq_printf (seq, "]"); |
45b4233c | 5298 | #ifdef DEBUG |
16a53ecc N |
5299 | seq_printf (seq, "\n"); |
5300 | printall(seq, conf); | |
1da177e4 LT |
5301 | #endif |
5302 | } | |
5303 | ||
5304 | static void print_raid5_conf (raid5_conf_t *conf) | |
5305 | { | |
5306 | int i; | |
5307 | struct disk_info *tmp; | |
5308 | ||
0c55e022 | 5309 | printk(KERN_DEBUG "RAID conf printout:\n"); |
1da177e4 LT |
5310 | if (!conf) { |
5311 | printk("(conf==NULL)\n"); | |
5312 | return; | |
5313 | } | |
0c55e022 N |
5314 | printk(KERN_DEBUG " --- level:%d rd:%d wd:%d\n", conf->level, |
5315 | conf->raid_disks, | |
5316 | conf->raid_disks - conf->mddev->degraded); | |
1da177e4 LT |
5317 | |
5318 | for (i = 0; i < conf->raid_disks; i++) { | |
5319 | char b[BDEVNAME_SIZE]; | |
5320 | tmp = conf->disks + i; | |
5321 | if (tmp->rdev) | |
0c55e022 N |
5322 | printk(KERN_DEBUG " disk %d, o:%d, dev:%s\n", |
5323 | i, !test_bit(Faulty, &tmp->rdev->flags), | |
5324 | bdevname(tmp->rdev->bdev, b)); | |
1da177e4 LT |
5325 | } |
5326 | } | |
5327 | ||
5328 | static int raid5_spare_active(mddev_t *mddev) | |
5329 | { | |
5330 | int i; | |
5331 | raid5_conf_t *conf = mddev->private; | |
5332 | struct disk_info *tmp; | |
6b965620 N |
5333 | int count = 0; |
5334 | unsigned long flags; | |
1da177e4 LT |
5335 | |
5336 | for (i = 0; i < conf->raid_disks; i++) { | |
5337 | tmp = conf->disks + i; | |
5338 | if (tmp->rdev | |
70fffd0b | 5339 | && tmp->rdev->recovery_offset == MaxSector |
b2d444d7 | 5340 | && !test_bit(Faulty, &tmp->rdev->flags) |
c04be0aa | 5341 | && !test_and_set_bit(In_sync, &tmp->rdev->flags)) { |
6b965620 | 5342 | count++; |
e6ffbcb6 | 5343 | sysfs_notify_dirent(tmp->rdev->sysfs_state); |
1da177e4 LT |
5344 | } |
5345 | } | |
6b965620 N |
5346 | spin_lock_irqsave(&conf->device_lock, flags); |
5347 | mddev->degraded -= count; | |
5348 | spin_unlock_irqrestore(&conf->device_lock, flags); | |
1da177e4 | 5349 | print_raid5_conf(conf); |
6b965620 | 5350 | return count; |
1da177e4 LT |
5351 | } |
5352 | ||
5353 | static int raid5_remove_disk(mddev_t *mddev, int number) | |
5354 | { | |
5355 | raid5_conf_t *conf = mddev->private; | |
5356 | int err = 0; | |
5357 | mdk_rdev_t *rdev; | |
5358 | struct disk_info *p = conf->disks + number; | |
5359 | ||
5360 | print_raid5_conf(conf); | |
5361 | rdev = p->rdev; | |
5362 | if (rdev) { | |
ec32a2bd N |
5363 | if (number >= conf->raid_disks && |
5364 | conf->reshape_progress == MaxSector) | |
5365 | clear_bit(In_sync, &rdev->flags); | |
5366 | ||
b2d444d7 | 5367 | if (test_bit(In_sync, &rdev->flags) || |
1da177e4 LT |
5368 | atomic_read(&rdev->nr_pending)) { |
5369 | err = -EBUSY; | |
5370 | goto abort; | |
5371 | } | |
dfc70645 N |
5372 | /* Only remove non-faulty devices if recovery |
5373 | * isn't possible. | |
5374 | */ | |
5375 | if (!test_bit(Faulty, &rdev->flags) && | |
674806d6 | 5376 | !has_failed(conf) && |
ec32a2bd | 5377 | number < conf->raid_disks) { |
dfc70645 N |
5378 | err = -EBUSY; |
5379 | goto abort; | |
5380 | } | |
1da177e4 | 5381 | p->rdev = NULL; |
fbd568a3 | 5382 | synchronize_rcu(); |
1da177e4 LT |
5383 | if (atomic_read(&rdev->nr_pending)) { |
5384 | /* lost the race, try later */ | |
5385 | err = -EBUSY; | |
5386 | p->rdev = rdev; | |
5387 | } | |
5388 | } | |
5389 | abort: | |
5390 | ||
5391 | print_raid5_conf(conf); | |
5392 | return err; | |
5393 | } | |
5394 | ||
5395 | static int raid5_add_disk(mddev_t *mddev, mdk_rdev_t *rdev) | |
5396 | { | |
5397 | raid5_conf_t *conf = mddev->private; | |
199050ea | 5398 | int err = -EEXIST; |
1da177e4 LT |
5399 | int disk; |
5400 | struct disk_info *p; | |
6c2fce2e NB |
5401 | int first = 0; |
5402 | int last = conf->raid_disks - 1; | |
1da177e4 | 5403 | |
674806d6 | 5404 | if (has_failed(conf)) |
1da177e4 | 5405 | /* no point adding a device */ |
199050ea | 5406 | return -EINVAL; |
1da177e4 | 5407 | |
6c2fce2e NB |
5408 | if (rdev->raid_disk >= 0) |
5409 | first = last = rdev->raid_disk; | |
1da177e4 LT |
5410 | |
5411 | /* | |
16a53ecc N |
5412 | * find the disk ... but prefer rdev->saved_raid_disk |
5413 | * if possible. | |
1da177e4 | 5414 | */ |
16a53ecc | 5415 | if (rdev->saved_raid_disk >= 0 && |
6c2fce2e | 5416 | rdev->saved_raid_disk >= first && |
16a53ecc N |
5417 | conf->disks[rdev->saved_raid_disk].rdev == NULL) |
5418 | disk = rdev->saved_raid_disk; | |
5419 | else | |
6c2fce2e NB |
5420 | disk = first; |
5421 | for ( ; disk <= last ; disk++) | |
1da177e4 | 5422 | if ((p=conf->disks + disk)->rdev == NULL) { |
b2d444d7 | 5423 | clear_bit(In_sync, &rdev->flags); |
1da177e4 | 5424 | rdev->raid_disk = disk; |
199050ea | 5425 | err = 0; |
72626685 N |
5426 | if (rdev->saved_raid_disk != disk) |
5427 | conf->fullsync = 1; | |
d6065f7b | 5428 | rcu_assign_pointer(p->rdev, rdev); |
1da177e4 LT |
5429 | break; |
5430 | } | |
5431 | print_raid5_conf(conf); | |
199050ea | 5432 | return err; |
1da177e4 LT |
5433 | } |
5434 | ||
5435 | static int raid5_resize(mddev_t *mddev, sector_t sectors) | |
5436 | { | |
5437 | /* no resync is happening, and there is enough space | |
5438 | * on all devices, so we can resize. | |
5439 | * We need to make sure resync covers any new space. | |
5440 | * If the array is shrinking we should possibly wait until | |
5441 | * any io in the removed space completes, but it hardly seems | |
5442 | * worth it. | |
5443 | */ | |
9d8f0363 | 5444 | sectors &= ~((sector_t)mddev->chunk_sectors - 1); |
1f403624 DW |
5445 | md_set_array_sectors(mddev, raid5_size(mddev, sectors, |
5446 | mddev->raid_disks)); | |
b522adcd DW |
5447 | if (mddev->array_sectors > |
5448 | raid5_size(mddev, sectors, mddev->raid_disks)) | |
5449 | return -EINVAL; | |
f233ea5c | 5450 | set_capacity(mddev->gendisk, mddev->array_sectors); |
449aad3e | 5451 | revalidate_disk(mddev->gendisk); |
58c0fed4 AN |
5452 | if (sectors > mddev->dev_sectors && mddev->recovery_cp == MaxSector) { |
5453 | mddev->recovery_cp = mddev->dev_sectors; | |
1da177e4 LT |
5454 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
5455 | } | |
58c0fed4 | 5456 | mddev->dev_sectors = sectors; |
4b5c7ae8 | 5457 | mddev->resync_max_sectors = sectors; |
1da177e4 LT |
5458 | return 0; |
5459 | } | |
5460 | ||
01ee22b4 N |
5461 | static int check_stripe_cache(mddev_t *mddev) |
5462 | { | |
5463 | /* Can only proceed if there are plenty of stripe_heads. | |
5464 | * We need a minimum of one full stripe,, and for sensible progress | |
5465 | * it is best to have about 4 times that. | |
5466 | * If we require 4 times, then the default 256 4K stripe_heads will | |
5467 | * allow for chunk sizes up to 256K, which is probably OK. | |
5468 | * If the chunk size is greater, user-space should request more | |
5469 | * stripe_heads first. | |
5470 | */ | |
5471 | raid5_conf_t *conf = mddev->private; | |
5472 | if (((mddev->chunk_sectors << 9) / STRIPE_SIZE) * 4 | |
5473 | > conf->max_nr_stripes || | |
5474 | ((mddev->new_chunk_sectors << 9) / STRIPE_SIZE) * 4 | |
5475 | > conf->max_nr_stripes) { | |
0c55e022 N |
5476 | printk(KERN_WARNING "md/raid:%s: reshape: not enough stripes. Needed %lu\n", |
5477 | mdname(mddev), | |
01ee22b4 N |
5478 | ((max(mddev->chunk_sectors, mddev->new_chunk_sectors) << 9) |
5479 | / STRIPE_SIZE)*4); | |
5480 | return 0; | |
5481 | } | |
5482 | return 1; | |
5483 | } | |
5484 | ||
50ac168a | 5485 | static int check_reshape(mddev_t *mddev) |
29269553 | 5486 | { |
070ec55d | 5487 | raid5_conf_t *conf = mddev->private; |
29269553 | 5488 | |
88ce4930 N |
5489 | if (mddev->delta_disks == 0 && |
5490 | mddev->new_layout == mddev->layout && | |
664e7c41 | 5491 | mddev->new_chunk_sectors == mddev->chunk_sectors) |
50ac168a | 5492 | return 0; /* nothing to do */ |
dba034ee N |
5493 | if (mddev->bitmap) |
5494 | /* Cannot grow a bitmap yet */ | |
5495 | return -EBUSY; | |
674806d6 | 5496 | if (has_failed(conf)) |
ec32a2bd N |
5497 | return -EINVAL; |
5498 | if (mddev->delta_disks < 0) { | |
5499 | /* We might be able to shrink, but the devices must | |
5500 | * be made bigger first. | |
5501 | * For raid6, 4 is the minimum size. | |
5502 | * Otherwise 2 is the minimum | |
5503 | */ | |
5504 | int min = 2; | |
5505 | if (mddev->level == 6) | |
5506 | min = 4; | |
5507 | if (mddev->raid_disks + mddev->delta_disks < min) | |
5508 | return -EINVAL; | |
5509 | } | |
29269553 | 5510 | |
01ee22b4 | 5511 | if (!check_stripe_cache(mddev)) |
29269553 | 5512 | return -ENOSPC; |
29269553 | 5513 | |
ec32a2bd | 5514 | return resize_stripes(conf, conf->raid_disks + mddev->delta_disks); |
63c70c4f N |
5515 | } |
5516 | ||
5517 | static int raid5_start_reshape(mddev_t *mddev) | |
5518 | { | |
070ec55d | 5519 | raid5_conf_t *conf = mddev->private; |
63c70c4f | 5520 | mdk_rdev_t *rdev; |
63c70c4f N |
5521 | int spares = 0; |
5522 | int added_devices = 0; | |
c04be0aa | 5523 | unsigned long flags; |
63c70c4f | 5524 | |
f416885e | 5525 | if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) |
63c70c4f N |
5526 | return -EBUSY; |
5527 | ||
01ee22b4 N |
5528 | if (!check_stripe_cache(mddev)) |
5529 | return -ENOSPC; | |
5530 | ||
159ec1fc | 5531 | list_for_each_entry(rdev, &mddev->disks, same_set) |
29269553 N |
5532 | if (rdev->raid_disk < 0 && |
5533 | !test_bit(Faulty, &rdev->flags)) | |
5534 | spares++; | |
63c70c4f | 5535 | |
f416885e | 5536 | if (spares - mddev->degraded < mddev->delta_disks - conf->max_degraded) |
29269553 N |
5537 | /* Not enough devices even to make a degraded array |
5538 | * of that size | |
5539 | */ | |
5540 | return -EINVAL; | |
5541 | ||
ec32a2bd N |
5542 | /* Refuse to reduce size of the array. Any reductions in |
5543 | * array size must be through explicit setting of array_size | |
5544 | * attribute. | |
5545 | */ | |
5546 | if (raid5_size(mddev, 0, conf->raid_disks + mddev->delta_disks) | |
5547 | < mddev->array_sectors) { | |
0c55e022 | 5548 | printk(KERN_ERR "md/raid:%s: array size must be reduced " |
ec32a2bd N |
5549 | "before number of disks\n", mdname(mddev)); |
5550 | return -EINVAL; | |
5551 | } | |
5552 | ||
f6705578 | 5553 | atomic_set(&conf->reshape_stripes, 0); |
29269553 N |
5554 | spin_lock_irq(&conf->device_lock); |
5555 | conf->previous_raid_disks = conf->raid_disks; | |
63c70c4f | 5556 | conf->raid_disks += mddev->delta_disks; |
09c9e5fa AN |
5557 | conf->prev_chunk_sectors = conf->chunk_sectors; |
5558 | conf->chunk_sectors = mddev->new_chunk_sectors; | |
88ce4930 N |
5559 | conf->prev_algo = conf->algorithm; |
5560 | conf->algorithm = mddev->new_layout; | |
fef9c61f N |
5561 | if (mddev->delta_disks < 0) |
5562 | conf->reshape_progress = raid5_size(mddev, 0, 0); | |
5563 | else | |
5564 | conf->reshape_progress = 0; | |
5565 | conf->reshape_safe = conf->reshape_progress; | |
86b42c71 | 5566 | conf->generation++; |
29269553 N |
5567 | spin_unlock_irq(&conf->device_lock); |
5568 | ||
5569 | /* Add some new drives, as many as will fit. | |
5570 | * We know there are enough to make the newly sized array work. | |
3424bf6a N |
5571 | * Don't add devices if we are reducing the number of |
5572 | * devices in the array. This is because it is not possible | |
5573 | * to correctly record the "partially reconstructed" state of | |
5574 | * such devices during the reshape and confusion could result. | |
29269553 | 5575 | */ |
3424bf6a N |
5576 | if (mddev->delta_disks >= 0) |
5577 | list_for_each_entry(rdev, &mddev->disks, same_set) | |
29269553 N |
5578 | if (rdev->raid_disk < 0 && |
5579 | !test_bit(Faulty, &rdev->flags)) { | |
199050ea | 5580 | if (raid5_add_disk(mddev, rdev) == 0) { |
29269553 | 5581 | char nm[20]; |
9eb07c25 | 5582 | if (rdev->raid_disk >= conf->previous_raid_disks) { |
7ef90146 | 5583 | set_bit(In_sync, &rdev->flags); |
9eb07c25 N |
5584 | added_devices++; |
5585 | } else | |
7ef90146 | 5586 | rdev->recovery_offset = 0; |
29269553 | 5587 | sprintf(nm, "rd%d", rdev->raid_disk); |
5e55e2f5 N |
5588 | if (sysfs_create_link(&mddev->kobj, |
5589 | &rdev->kobj, nm)) | |
00bcb4ac | 5590 | /* Failure here is OK */; |
29269553 N |
5591 | } else |
5592 | break; | |
5593 | } | |
5594 | ||
9eb07c25 | 5595 | /* When a reshape changes the number of devices, ->degraded |
3424bf6a | 5596 | * is measured against the larger of the pre and post number of |
9eb07c25 | 5597 | * devices.*/ |
ec32a2bd N |
5598 | if (mddev->delta_disks > 0) { |
5599 | spin_lock_irqsave(&conf->device_lock, flags); | |
9eb07c25 | 5600 | mddev->degraded += (conf->raid_disks - conf->previous_raid_disks) |
ec32a2bd N |
5601 | - added_devices; |
5602 | spin_unlock_irqrestore(&conf->device_lock, flags); | |
5603 | } | |
63c70c4f | 5604 | mddev->raid_disks = conf->raid_disks; |
e516402c | 5605 | mddev->reshape_position = conf->reshape_progress; |
850b2b42 | 5606 | set_bit(MD_CHANGE_DEVS, &mddev->flags); |
f6705578 | 5607 | |
29269553 N |
5608 | clear_bit(MD_RECOVERY_SYNC, &mddev->recovery); |
5609 | clear_bit(MD_RECOVERY_CHECK, &mddev->recovery); | |
5610 | set_bit(MD_RECOVERY_RESHAPE, &mddev->recovery); | |
5611 | set_bit(MD_RECOVERY_RUNNING, &mddev->recovery); | |
5612 | mddev->sync_thread = md_register_thread(md_do_sync, mddev, | |
0da3c619 | 5613 | "reshape"); |
29269553 N |
5614 | if (!mddev->sync_thread) { |
5615 | mddev->recovery = 0; | |
5616 | spin_lock_irq(&conf->device_lock); | |
5617 | mddev->raid_disks = conf->raid_disks = conf->previous_raid_disks; | |
fef9c61f | 5618 | conf->reshape_progress = MaxSector; |
29269553 N |
5619 | spin_unlock_irq(&conf->device_lock); |
5620 | return -EAGAIN; | |
5621 | } | |
c8f517c4 | 5622 | conf->reshape_checkpoint = jiffies; |
29269553 N |
5623 | md_wakeup_thread(mddev->sync_thread); |
5624 | md_new_event(mddev); | |
5625 | return 0; | |
5626 | } | |
29269553 | 5627 | |
ec32a2bd N |
5628 | /* This is called from the reshape thread and should make any |
5629 | * changes needed in 'conf' | |
5630 | */ | |
29269553 N |
5631 | static void end_reshape(raid5_conf_t *conf) |
5632 | { | |
29269553 | 5633 | |
f6705578 | 5634 | if (!test_bit(MD_RECOVERY_INTR, &conf->mddev->recovery)) { |
f6705578 | 5635 | |
f6705578 | 5636 | spin_lock_irq(&conf->device_lock); |
cea9c228 | 5637 | conf->previous_raid_disks = conf->raid_disks; |
fef9c61f | 5638 | conf->reshape_progress = MaxSector; |
f6705578 | 5639 | spin_unlock_irq(&conf->device_lock); |
b0f9ec04 | 5640 | wake_up(&conf->wait_for_overlap); |
16a53ecc N |
5641 | |
5642 | /* read-ahead size must cover two whole stripes, which is | |
5643 | * 2 * (datadisks) * chunksize where 'n' is the number of raid devices | |
5644 | */ | |
4a5add49 | 5645 | if (conf->mddev->queue) { |
cea9c228 | 5646 | int data_disks = conf->raid_disks - conf->max_degraded; |
09c9e5fa | 5647 | int stripe = data_disks * ((conf->chunk_sectors << 9) |
cea9c228 | 5648 | / PAGE_SIZE); |
16a53ecc N |
5649 | if (conf->mddev->queue->backing_dev_info.ra_pages < 2 * stripe) |
5650 | conf->mddev->queue->backing_dev_info.ra_pages = 2 * stripe; | |
5651 | } | |
29269553 | 5652 | } |
29269553 N |
5653 | } |
5654 | ||
ec32a2bd N |
5655 | /* This is called from the raid5d thread with mddev_lock held. |
5656 | * It makes config changes to the device. | |
5657 | */ | |
cea9c228 N |
5658 | static void raid5_finish_reshape(mddev_t *mddev) |
5659 | { | |
070ec55d | 5660 | raid5_conf_t *conf = mddev->private; |
cea9c228 N |
5661 | |
5662 | if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery)) { | |
5663 | ||
ec32a2bd N |
5664 | if (mddev->delta_disks > 0) { |
5665 | md_set_array_sectors(mddev, raid5_size(mddev, 0, 0)); | |
5666 | set_capacity(mddev->gendisk, mddev->array_sectors); | |
449aad3e | 5667 | revalidate_disk(mddev->gendisk); |
ec32a2bd N |
5668 | } else { |
5669 | int d; | |
ec32a2bd N |
5670 | mddev->degraded = conf->raid_disks; |
5671 | for (d = 0; d < conf->raid_disks ; d++) | |
5672 | if (conf->disks[d].rdev && | |
5673 | test_bit(In_sync, | |
5674 | &conf->disks[d].rdev->flags)) | |
5675 | mddev->degraded--; | |
5676 | for (d = conf->raid_disks ; | |
5677 | d < conf->raid_disks - mddev->delta_disks; | |
1a67dde0 N |
5678 | d++) { |
5679 | mdk_rdev_t *rdev = conf->disks[d].rdev; | |
5680 | if (rdev && raid5_remove_disk(mddev, d) == 0) { | |
5681 | char nm[20]; | |
5682 | sprintf(nm, "rd%d", rdev->raid_disk); | |
5683 | sysfs_remove_link(&mddev->kobj, nm); | |
5684 | rdev->raid_disk = -1; | |
5685 | } | |
5686 | } | |
cea9c228 | 5687 | } |
88ce4930 | 5688 | mddev->layout = conf->algorithm; |
09c9e5fa | 5689 | mddev->chunk_sectors = conf->chunk_sectors; |
ec32a2bd N |
5690 | mddev->reshape_position = MaxSector; |
5691 | mddev->delta_disks = 0; | |
cea9c228 N |
5692 | } |
5693 | } | |
5694 | ||
72626685 N |
5695 | static void raid5_quiesce(mddev_t *mddev, int state) |
5696 | { | |
070ec55d | 5697 | raid5_conf_t *conf = mddev->private; |
72626685 N |
5698 | |
5699 | switch(state) { | |
e464eafd N |
5700 | case 2: /* resume for a suspend */ |
5701 | wake_up(&conf->wait_for_overlap); | |
5702 | break; | |
5703 | ||
72626685 N |
5704 | case 1: /* stop all writes */ |
5705 | spin_lock_irq(&conf->device_lock); | |
64bd660b N |
5706 | /* '2' tells resync/reshape to pause so that all |
5707 | * active stripes can drain | |
5708 | */ | |
5709 | conf->quiesce = 2; | |
72626685 | 5710 | wait_event_lock_irq(conf->wait_for_stripe, |
46031f9a RBJ |
5711 | atomic_read(&conf->active_stripes) == 0 && |
5712 | atomic_read(&conf->active_aligned_reads) == 0, | |
72626685 | 5713 | conf->device_lock, /* nothing */); |
64bd660b | 5714 | conf->quiesce = 1; |
72626685 | 5715 | spin_unlock_irq(&conf->device_lock); |
64bd660b N |
5716 | /* allow reshape to continue */ |
5717 | wake_up(&conf->wait_for_overlap); | |
72626685 N |
5718 | break; |
5719 | ||
5720 | case 0: /* re-enable writes */ | |
5721 | spin_lock_irq(&conf->device_lock); | |
5722 | conf->quiesce = 0; | |
5723 | wake_up(&conf->wait_for_stripe); | |
e464eafd | 5724 | wake_up(&conf->wait_for_overlap); |
72626685 N |
5725 | spin_unlock_irq(&conf->device_lock); |
5726 | break; | |
5727 | } | |
72626685 | 5728 | } |
b15c2e57 | 5729 | |
d562b0c4 | 5730 | |
f1b29bca | 5731 | static void *raid45_takeover_raid0(mddev_t *mddev, int level) |
54071b38 | 5732 | { |
f1b29bca | 5733 | struct raid0_private_data *raid0_priv = mddev->private; |
54071b38 | 5734 | |
f1b29bca DW |
5735 | /* for raid0 takeover only one zone is supported */ |
5736 | if (raid0_priv->nr_strip_zones > 1) { | |
0c55e022 N |
5737 | printk(KERN_ERR "md/raid:%s: cannot takeover raid0 with more than one zone.\n", |
5738 | mdname(mddev)); | |
f1b29bca DW |
5739 | return ERR_PTR(-EINVAL); |
5740 | } | |
5741 | ||
5742 | mddev->new_level = level; | |
54071b38 TM |
5743 | mddev->new_layout = ALGORITHM_PARITY_N; |
5744 | mddev->new_chunk_sectors = mddev->chunk_sectors; | |
5745 | mddev->raid_disks += 1; | |
5746 | mddev->delta_disks = 1; | |
5747 | /* make sure it will be not marked as dirty */ | |
5748 | mddev->recovery_cp = MaxSector; | |
5749 | ||
5750 | return setup_conf(mddev); | |
5751 | } | |
5752 | ||
5753 | ||
d562b0c4 N |
5754 | static void *raid5_takeover_raid1(mddev_t *mddev) |
5755 | { | |
5756 | int chunksect; | |
5757 | ||
5758 | if (mddev->raid_disks != 2 || | |
5759 | mddev->degraded > 1) | |
5760 | return ERR_PTR(-EINVAL); | |
5761 | ||
5762 | /* Should check if there are write-behind devices? */ | |
5763 | ||
5764 | chunksect = 64*2; /* 64K by default */ | |
5765 | ||
5766 | /* The array must be an exact multiple of chunksize */ | |
5767 | while (chunksect && (mddev->array_sectors & (chunksect-1))) | |
5768 | chunksect >>= 1; | |
5769 | ||
5770 | if ((chunksect<<9) < STRIPE_SIZE) | |
5771 | /* array size does not allow a suitable chunk size */ | |
5772 | return ERR_PTR(-EINVAL); | |
5773 | ||
5774 | mddev->new_level = 5; | |
5775 | mddev->new_layout = ALGORITHM_LEFT_SYMMETRIC; | |
664e7c41 | 5776 | mddev->new_chunk_sectors = chunksect; |
d562b0c4 N |
5777 | |
5778 | return setup_conf(mddev); | |
5779 | } | |
5780 | ||
fc9739c6 N |
5781 | static void *raid5_takeover_raid6(mddev_t *mddev) |
5782 | { | |
5783 | int new_layout; | |
5784 | ||
5785 | switch (mddev->layout) { | |
5786 | case ALGORITHM_LEFT_ASYMMETRIC_6: | |
5787 | new_layout = ALGORITHM_LEFT_ASYMMETRIC; | |
5788 | break; | |
5789 | case ALGORITHM_RIGHT_ASYMMETRIC_6: | |
5790 | new_layout = ALGORITHM_RIGHT_ASYMMETRIC; | |
5791 | break; | |
5792 | case ALGORITHM_LEFT_SYMMETRIC_6: | |
5793 | new_layout = ALGORITHM_LEFT_SYMMETRIC; | |
5794 | break; | |
5795 | case ALGORITHM_RIGHT_SYMMETRIC_6: | |
5796 | new_layout = ALGORITHM_RIGHT_SYMMETRIC; | |
5797 | break; | |
5798 | case ALGORITHM_PARITY_0_6: | |
5799 | new_layout = ALGORITHM_PARITY_0; | |
5800 | break; | |
5801 | case ALGORITHM_PARITY_N: | |
5802 | new_layout = ALGORITHM_PARITY_N; | |
5803 | break; | |
5804 | default: | |
5805 | return ERR_PTR(-EINVAL); | |
5806 | } | |
5807 | mddev->new_level = 5; | |
5808 | mddev->new_layout = new_layout; | |
5809 | mddev->delta_disks = -1; | |
5810 | mddev->raid_disks -= 1; | |
5811 | return setup_conf(mddev); | |
5812 | } | |
5813 | ||
d562b0c4 | 5814 | |
50ac168a | 5815 | static int raid5_check_reshape(mddev_t *mddev) |
b3546035 | 5816 | { |
88ce4930 N |
5817 | /* For a 2-drive array, the layout and chunk size can be changed |
5818 | * immediately as not restriping is needed. | |
5819 | * For larger arrays we record the new value - after validation | |
5820 | * to be used by a reshape pass. | |
b3546035 | 5821 | */ |
070ec55d | 5822 | raid5_conf_t *conf = mddev->private; |
597a711b | 5823 | int new_chunk = mddev->new_chunk_sectors; |
b3546035 | 5824 | |
597a711b | 5825 | if (mddev->new_layout >= 0 && !algorithm_valid_raid5(mddev->new_layout)) |
b3546035 N |
5826 | return -EINVAL; |
5827 | if (new_chunk > 0) { | |
0ba459d2 | 5828 | if (!is_power_of_2(new_chunk)) |
b3546035 | 5829 | return -EINVAL; |
597a711b | 5830 | if (new_chunk < (PAGE_SIZE>>9)) |
b3546035 | 5831 | return -EINVAL; |
597a711b | 5832 | if (mddev->array_sectors & (new_chunk-1)) |
b3546035 N |
5833 | /* not factor of array size */ |
5834 | return -EINVAL; | |
5835 | } | |
5836 | ||
5837 | /* They look valid */ | |
5838 | ||
88ce4930 | 5839 | if (mddev->raid_disks == 2) { |
597a711b N |
5840 | /* can make the change immediately */ |
5841 | if (mddev->new_layout >= 0) { | |
5842 | conf->algorithm = mddev->new_layout; | |
5843 | mddev->layout = mddev->new_layout; | |
88ce4930 N |
5844 | } |
5845 | if (new_chunk > 0) { | |
597a711b N |
5846 | conf->chunk_sectors = new_chunk ; |
5847 | mddev->chunk_sectors = new_chunk; | |
88ce4930 N |
5848 | } |
5849 | set_bit(MD_CHANGE_DEVS, &mddev->flags); | |
5850 | md_wakeup_thread(mddev->thread); | |
b3546035 | 5851 | } |
50ac168a | 5852 | return check_reshape(mddev); |
88ce4930 N |
5853 | } |
5854 | ||
50ac168a | 5855 | static int raid6_check_reshape(mddev_t *mddev) |
88ce4930 | 5856 | { |
597a711b | 5857 | int new_chunk = mddev->new_chunk_sectors; |
50ac168a | 5858 | |
597a711b | 5859 | if (mddev->new_layout >= 0 && !algorithm_valid_raid6(mddev->new_layout)) |
88ce4930 | 5860 | return -EINVAL; |
b3546035 | 5861 | if (new_chunk > 0) { |
0ba459d2 | 5862 | if (!is_power_of_2(new_chunk)) |
88ce4930 | 5863 | return -EINVAL; |
597a711b | 5864 | if (new_chunk < (PAGE_SIZE >> 9)) |
88ce4930 | 5865 | return -EINVAL; |
597a711b | 5866 | if (mddev->array_sectors & (new_chunk-1)) |
88ce4930 N |
5867 | /* not factor of array size */ |
5868 | return -EINVAL; | |
b3546035 | 5869 | } |
88ce4930 N |
5870 | |
5871 | /* They look valid */ | |
50ac168a | 5872 | return check_reshape(mddev); |
b3546035 N |
5873 | } |
5874 | ||
d562b0c4 N |
5875 | static void *raid5_takeover(mddev_t *mddev) |
5876 | { | |
5877 | /* raid5 can take over: | |
f1b29bca | 5878 | * raid0 - if there is only one strip zone - make it a raid4 layout |
d562b0c4 N |
5879 | * raid1 - if there are two drives. We need to know the chunk size |
5880 | * raid4 - trivial - just use a raid4 layout. | |
5881 | * raid6 - Providing it is a *_6 layout | |
d562b0c4 | 5882 | */ |
f1b29bca DW |
5883 | if (mddev->level == 0) |
5884 | return raid45_takeover_raid0(mddev, 5); | |
d562b0c4 N |
5885 | if (mddev->level == 1) |
5886 | return raid5_takeover_raid1(mddev); | |
e9d4758f N |
5887 | if (mddev->level == 4) { |
5888 | mddev->new_layout = ALGORITHM_PARITY_N; | |
5889 | mddev->new_level = 5; | |
5890 | return setup_conf(mddev); | |
5891 | } | |
fc9739c6 N |
5892 | if (mddev->level == 6) |
5893 | return raid5_takeover_raid6(mddev); | |
d562b0c4 N |
5894 | |
5895 | return ERR_PTR(-EINVAL); | |
5896 | } | |
5897 | ||
a78d38a1 N |
5898 | static void *raid4_takeover(mddev_t *mddev) |
5899 | { | |
f1b29bca DW |
5900 | /* raid4 can take over: |
5901 | * raid0 - if there is only one strip zone | |
5902 | * raid5 - if layout is right | |
a78d38a1 | 5903 | */ |
f1b29bca DW |
5904 | if (mddev->level == 0) |
5905 | return raid45_takeover_raid0(mddev, 4); | |
a78d38a1 N |
5906 | if (mddev->level == 5 && |
5907 | mddev->layout == ALGORITHM_PARITY_N) { | |
5908 | mddev->new_layout = 0; | |
5909 | mddev->new_level = 4; | |
5910 | return setup_conf(mddev); | |
5911 | } | |
5912 | return ERR_PTR(-EINVAL); | |
5913 | } | |
d562b0c4 | 5914 | |
245f46c2 N |
5915 | static struct mdk_personality raid5_personality; |
5916 | ||
5917 | static void *raid6_takeover(mddev_t *mddev) | |
5918 | { | |
5919 | /* Currently can only take over a raid5. We map the | |
5920 | * personality to an equivalent raid6 personality | |
5921 | * with the Q block at the end. | |
5922 | */ | |
5923 | int new_layout; | |
5924 | ||
5925 | if (mddev->pers != &raid5_personality) | |
5926 | return ERR_PTR(-EINVAL); | |
5927 | if (mddev->degraded > 1) | |
5928 | return ERR_PTR(-EINVAL); | |
5929 | if (mddev->raid_disks > 253) | |
5930 | return ERR_PTR(-EINVAL); | |
5931 | if (mddev->raid_disks < 3) | |
5932 | return ERR_PTR(-EINVAL); | |
5933 | ||
5934 | switch (mddev->layout) { | |
5935 | case ALGORITHM_LEFT_ASYMMETRIC: | |
5936 | new_layout = ALGORITHM_LEFT_ASYMMETRIC_6; | |
5937 | break; | |
5938 | case ALGORITHM_RIGHT_ASYMMETRIC: | |
5939 | new_layout = ALGORITHM_RIGHT_ASYMMETRIC_6; | |
5940 | break; | |
5941 | case ALGORITHM_LEFT_SYMMETRIC: | |
5942 | new_layout = ALGORITHM_LEFT_SYMMETRIC_6; | |
5943 | break; | |
5944 | case ALGORITHM_RIGHT_SYMMETRIC: | |
5945 | new_layout = ALGORITHM_RIGHT_SYMMETRIC_6; | |
5946 | break; | |
5947 | case ALGORITHM_PARITY_0: | |
5948 | new_layout = ALGORITHM_PARITY_0_6; | |
5949 | break; | |
5950 | case ALGORITHM_PARITY_N: | |
5951 | new_layout = ALGORITHM_PARITY_N; | |
5952 | break; | |
5953 | default: | |
5954 | return ERR_PTR(-EINVAL); | |
5955 | } | |
5956 | mddev->new_level = 6; | |
5957 | mddev->new_layout = new_layout; | |
5958 | mddev->delta_disks = 1; | |
5959 | mddev->raid_disks += 1; | |
5960 | return setup_conf(mddev); | |
5961 | } | |
5962 | ||
5963 | ||
16a53ecc N |
5964 | static struct mdk_personality raid6_personality = |
5965 | { | |
5966 | .name = "raid6", | |
5967 | .level = 6, | |
5968 | .owner = THIS_MODULE, | |
5969 | .make_request = make_request, | |
5970 | .run = run, | |
5971 | .stop = stop, | |
5972 | .status = status, | |
5973 | .error_handler = error, | |
5974 | .hot_add_disk = raid5_add_disk, | |
5975 | .hot_remove_disk= raid5_remove_disk, | |
5976 | .spare_active = raid5_spare_active, | |
5977 | .sync_request = sync_request, | |
5978 | .resize = raid5_resize, | |
80c3a6ce | 5979 | .size = raid5_size, |
50ac168a | 5980 | .check_reshape = raid6_check_reshape, |
f416885e | 5981 | .start_reshape = raid5_start_reshape, |
cea9c228 | 5982 | .finish_reshape = raid5_finish_reshape, |
16a53ecc | 5983 | .quiesce = raid5_quiesce, |
245f46c2 | 5984 | .takeover = raid6_takeover, |
16a53ecc | 5985 | }; |
2604b703 | 5986 | static struct mdk_personality raid5_personality = |
1da177e4 LT |
5987 | { |
5988 | .name = "raid5", | |
2604b703 | 5989 | .level = 5, |
1da177e4 LT |
5990 | .owner = THIS_MODULE, |
5991 | .make_request = make_request, | |
5992 | .run = run, | |
5993 | .stop = stop, | |
5994 | .status = status, | |
5995 | .error_handler = error, | |
5996 | .hot_add_disk = raid5_add_disk, | |
5997 | .hot_remove_disk= raid5_remove_disk, | |
5998 | .spare_active = raid5_spare_active, | |
5999 | .sync_request = sync_request, | |
6000 | .resize = raid5_resize, | |
80c3a6ce | 6001 | .size = raid5_size, |
63c70c4f N |
6002 | .check_reshape = raid5_check_reshape, |
6003 | .start_reshape = raid5_start_reshape, | |
cea9c228 | 6004 | .finish_reshape = raid5_finish_reshape, |
72626685 | 6005 | .quiesce = raid5_quiesce, |
d562b0c4 | 6006 | .takeover = raid5_takeover, |
1da177e4 LT |
6007 | }; |
6008 | ||
2604b703 | 6009 | static struct mdk_personality raid4_personality = |
1da177e4 | 6010 | { |
2604b703 N |
6011 | .name = "raid4", |
6012 | .level = 4, | |
6013 | .owner = THIS_MODULE, | |
6014 | .make_request = make_request, | |
6015 | .run = run, | |
6016 | .stop = stop, | |
6017 | .status = status, | |
6018 | .error_handler = error, | |
6019 | .hot_add_disk = raid5_add_disk, | |
6020 | .hot_remove_disk= raid5_remove_disk, | |
6021 | .spare_active = raid5_spare_active, | |
6022 | .sync_request = sync_request, | |
6023 | .resize = raid5_resize, | |
80c3a6ce | 6024 | .size = raid5_size, |
3d37890b N |
6025 | .check_reshape = raid5_check_reshape, |
6026 | .start_reshape = raid5_start_reshape, | |
cea9c228 | 6027 | .finish_reshape = raid5_finish_reshape, |
2604b703 | 6028 | .quiesce = raid5_quiesce, |
a78d38a1 | 6029 | .takeover = raid4_takeover, |
2604b703 N |
6030 | }; |
6031 | ||
6032 | static int __init raid5_init(void) | |
6033 | { | |
16a53ecc | 6034 | register_md_personality(&raid6_personality); |
2604b703 N |
6035 | register_md_personality(&raid5_personality); |
6036 | register_md_personality(&raid4_personality); | |
6037 | return 0; | |
1da177e4 LT |
6038 | } |
6039 | ||
2604b703 | 6040 | static void raid5_exit(void) |
1da177e4 | 6041 | { |
16a53ecc | 6042 | unregister_md_personality(&raid6_personality); |
2604b703 N |
6043 | unregister_md_personality(&raid5_personality); |
6044 | unregister_md_personality(&raid4_personality); | |
1da177e4 LT |
6045 | } |
6046 | ||
6047 | module_init(raid5_init); | |
6048 | module_exit(raid5_exit); | |
6049 | MODULE_LICENSE("GPL"); | |
0efb9e61 | 6050 | MODULE_DESCRIPTION("RAID4/5/6 (striping with parity) personality for MD"); |
1da177e4 | 6051 | MODULE_ALIAS("md-personality-4"); /* RAID5 */ |
d9d166c2 N |
6052 | MODULE_ALIAS("md-raid5"); |
6053 | MODULE_ALIAS("md-raid4"); | |
2604b703 N |
6054 | MODULE_ALIAS("md-level-5"); |
6055 | MODULE_ALIAS("md-level-4"); | |
16a53ecc N |
6056 | MODULE_ALIAS("md-personality-8"); /* RAID6 */ |
6057 | MODULE_ALIAS("md-raid6"); | |
6058 | MODULE_ALIAS("md-level-6"); | |
6059 | ||
6060 | /* This used to be two separate modules, they were: */ | |
6061 | MODULE_ALIAS("raid5"); | |
6062 | MODULE_ALIAS("raid6"); |