Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * raid5.c : Multiple Devices driver for Linux | |
3 | * Copyright (C) 1996, 1997 Ingo Molnar, Miguel de Icaza, Gadi Oxman | |
4 | * Copyright (C) 1999, 2000 Ingo Molnar | |
16a53ecc | 5 | * Copyright (C) 2002, 2003 H. Peter Anvin |
1da177e4 | 6 | * |
16a53ecc N |
7 | * RAID-4/5/6 management functions. |
8 | * Thanks to Penguin Computing for making the RAID-6 development possible | |
9 | * by donating a test server! | |
1da177e4 LT |
10 | * |
11 | * This program is free software; you can redistribute it and/or modify | |
12 | * it under the terms of the GNU General Public License as published by | |
13 | * the Free Software Foundation; either version 2, or (at your option) | |
14 | * any later version. | |
15 | * | |
16 | * You should have received a copy of the GNU General Public License | |
17 | * (for example /usr/src/linux/COPYING); if not, write to the Free | |
18 | * Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. | |
19 | */ | |
20 | ||
ae3c20cc N |
21 | /* |
22 | * BITMAP UNPLUGGING: | |
23 | * | |
24 | * The sequencing for updating the bitmap reliably is a little | |
25 | * subtle (and I got it wrong the first time) so it deserves some | |
26 | * explanation. | |
27 | * | |
28 | * We group bitmap updates into batches. Each batch has a number. | |
29 | * We may write out several batches at once, but that isn't very important. | |
7c13edc8 N |
30 | * conf->seq_write is the number of the last batch successfully written. |
31 | * conf->seq_flush is the number of the last batch that was closed to | |
ae3c20cc N |
32 | * new additions. |
33 | * When we discover that we will need to write to any block in a stripe | |
34 | * (in add_stripe_bio) we update the in-memory bitmap and record in sh->bm_seq | |
7c13edc8 | 35 | * the number of the batch it will be in. This is seq_flush+1. |
ae3c20cc N |
36 | * When we are ready to do a write, if that batch hasn't been written yet, |
37 | * we plug the array and queue the stripe for later. | |
38 | * When an unplug happens, we increment bm_flush, thus closing the current | |
39 | * batch. | |
40 | * When we notice that bm_flush > bm_write, we write out all pending updates | |
41 | * to the bitmap, and advance bm_write to where bm_flush was. | |
42 | * This may occasionally write a bit out twice, but is sure never to | |
43 | * miss any bits. | |
44 | */ | |
1da177e4 | 45 | |
bff61975 | 46 | #include <linux/blkdev.h> |
f6705578 | 47 | #include <linux/kthread.h> |
f701d589 | 48 | #include <linux/raid/pq.h> |
91c00924 | 49 | #include <linux/async_tx.h> |
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> |
8bda470e | 54 | #include <linux/ratelimit.h> |
43b2e5d8 | 55 | #include "md.h" |
bff61975 | 56 | #include "raid5.h" |
54071b38 | 57 | #include "raid0.h" |
ef740c37 | 58 | #include "bitmap.h" |
72626685 | 59 | |
1da177e4 LT |
60 | /* |
61 | * Stripe cache | |
62 | */ | |
63 | ||
64 | #define NR_STRIPES 256 | |
65 | #define STRIPE_SIZE PAGE_SIZE | |
66 | #define STRIPE_SHIFT (PAGE_SHIFT - 9) | |
67 | #define STRIPE_SECTORS (STRIPE_SIZE>>9) | |
68 | #define IO_THRESHOLD 1 | |
8b3e6cdc | 69 | #define BYPASS_THRESHOLD 1 |
fccddba0 | 70 | #define NR_HASH (PAGE_SIZE / sizeof(struct hlist_head)) |
1da177e4 LT |
71 | #define HASH_MASK (NR_HASH - 1) |
72 | ||
fccddba0 | 73 | #define stripe_hash(conf, sect) (&((conf)->stripe_hashtbl[((sect) >> STRIPE_SHIFT) & HASH_MASK])) |
1da177e4 LT |
74 | |
75 | /* bio's attached to a stripe+device for I/O are linked together in bi_sector | |
76 | * order without overlap. There may be several bio's per stripe+device, and | |
77 | * a bio could span several devices. | |
78 | * When walking this list for a particular stripe+device, we must never proceed | |
79 | * beyond a bio that extends past this device, as the next bio might no longer | |
80 | * be valid. | |
81 | * This macro is used to determine the 'next' bio in the list, given the sector | |
82 | * of the current stripe+device | |
83 | */ | |
84 | #define r5_next_bio(bio, sect) ( ( (bio)->bi_sector + ((bio)->bi_size>>9) < sect + STRIPE_SECTORS) ? (bio)->bi_next : NULL) | |
85 | /* | |
86 | * The following can be used to debug the driver | |
87 | */ | |
1da177e4 LT |
88 | #define RAID5_PARANOIA 1 |
89 | #if RAID5_PARANOIA && defined(CONFIG_SMP) | |
90 | # define CHECK_DEVLOCK() assert_spin_locked(&conf->device_lock) | |
91 | #else | |
92 | # define CHECK_DEVLOCK() | |
93 | #endif | |
94 | ||
45b4233c | 95 | #ifdef DEBUG |
1da177e4 LT |
96 | #define inline |
97 | #define __inline__ | |
98 | #endif | |
99 | ||
960e739d | 100 | /* |
5b99c2ff JA |
101 | * We maintain a biased count of active stripes in the bottom 16 bits of |
102 | * bi_phys_segments, and a count of processed stripes in the upper 16 bits | |
960e739d JA |
103 | */ |
104 | static inline int raid5_bi_phys_segments(struct bio *bio) | |
105 | { | |
5b99c2ff | 106 | return bio->bi_phys_segments & 0xffff; |
960e739d JA |
107 | } |
108 | ||
109 | static inline int raid5_bi_hw_segments(struct bio *bio) | |
110 | { | |
5b99c2ff | 111 | return (bio->bi_phys_segments >> 16) & 0xffff; |
960e739d JA |
112 | } |
113 | ||
114 | static inline int raid5_dec_bi_phys_segments(struct bio *bio) | |
115 | { | |
116 | --bio->bi_phys_segments; | |
117 | return raid5_bi_phys_segments(bio); | |
118 | } | |
119 | ||
120 | static inline int raid5_dec_bi_hw_segments(struct bio *bio) | |
121 | { | |
122 | unsigned short val = raid5_bi_hw_segments(bio); | |
123 | ||
124 | --val; | |
5b99c2ff | 125 | bio->bi_phys_segments = (val << 16) | raid5_bi_phys_segments(bio); |
960e739d JA |
126 | return val; |
127 | } | |
128 | ||
129 | static inline void raid5_set_bi_hw_segments(struct bio *bio, unsigned int cnt) | |
130 | { | |
9b2dc8b6 | 131 | bio->bi_phys_segments = raid5_bi_phys_segments(bio) | (cnt << 16); |
960e739d JA |
132 | } |
133 | ||
d0dabf7e N |
134 | /* Find first data disk in a raid6 stripe */ |
135 | static inline int raid6_d0(struct stripe_head *sh) | |
136 | { | |
67cc2b81 N |
137 | if (sh->ddf_layout) |
138 | /* ddf always start from first device */ | |
139 | return 0; | |
140 | /* md starts just after Q block */ | |
d0dabf7e N |
141 | if (sh->qd_idx == sh->disks - 1) |
142 | return 0; | |
143 | else | |
144 | return sh->qd_idx + 1; | |
145 | } | |
16a53ecc N |
146 | static inline int raid6_next_disk(int disk, int raid_disks) |
147 | { | |
148 | disk++; | |
149 | return (disk < raid_disks) ? disk : 0; | |
150 | } | |
a4456856 | 151 | |
d0dabf7e N |
152 | /* When walking through the disks in a raid5, starting at raid6_d0, |
153 | * We need to map each disk to a 'slot', where the data disks are slot | |
154 | * 0 .. raid_disks-3, the parity disk is raid_disks-2 and the Q disk | |
155 | * is raid_disks-1. This help does that mapping. | |
156 | */ | |
67cc2b81 N |
157 | static int raid6_idx_to_slot(int idx, struct stripe_head *sh, |
158 | int *count, int syndrome_disks) | |
d0dabf7e | 159 | { |
6629542e | 160 | int slot = *count; |
67cc2b81 | 161 | |
e4424fee | 162 | if (sh->ddf_layout) |
6629542e | 163 | (*count)++; |
d0dabf7e | 164 | if (idx == sh->pd_idx) |
67cc2b81 | 165 | return syndrome_disks; |
d0dabf7e | 166 | if (idx == sh->qd_idx) |
67cc2b81 | 167 | return syndrome_disks + 1; |
e4424fee | 168 | if (!sh->ddf_layout) |
6629542e | 169 | (*count)++; |
d0dabf7e N |
170 | return slot; |
171 | } | |
172 | ||
a4456856 DW |
173 | static void return_io(struct bio *return_bi) |
174 | { | |
175 | struct bio *bi = return_bi; | |
176 | while (bi) { | |
a4456856 DW |
177 | |
178 | return_bi = bi->bi_next; | |
179 | bi->bi_next = NULL; | |
180 | bi->bi_size = 0; | |
0e13fe23 | 181 | bio_endio(bi, 0); |
a4456856 DW |
182 | bi = return_bi; |
183 | } | |
184 | } | |
185 | ||
1da177e4 LT |
186 | static void print_raid5_conf (raid5_conf_t *conf); |
187 | ||
600aa109 DW |
188 | static int stripe_operations_active(struct stripe_head *sh) |
189 | { | |
190 | return sh->check_state || sh->reconstruct_state || | |
191 | test_bit(STRIPE_BIOFILL_RUN, &sh->state) || | |
192 | test_bit(STRIPE_COMPUTE_RUN, &sh->state); | |
193 | } | |
194 | ||
858119e1 | 195 | static void __release_stripe(raid5_conf_t *conf, struct stripe_head *sh) |
1da177e4 LT |
196 | { |
197 | if (atomic_dec_and_test(&sh->count)) { | |
78bafebd ES |
198 | BUG_ON(!list_empty(&sh->lru)); |
199 | BUG_ON(atomic_read(&conf->active_stripes)==0); | |
1da177e4 | 200 | if (test_bit(STRIPE_HANDLE, &sh->state)) { |
482c0834 | 201 | if (test_bit(STRIPE_DELAYED, &sh->state)) |
1da177e4 | 202 | list_add_tail(&sh->lru, &conf->delayed_list); |
482c0834 N |
203 | else if (test_bit(STRIPE_BIT_DELAY, &sh->state) && |
204 | sh->bm_seq - conf->seq_write > 0) | |
72626685 | 205 | list_add_tail(&sh->lru, &conf->bitmap_list); |
482c0834 | 206 | else { |
72626685 | 207 | clear_bit(STRIPE_BIT_DELAY, &sh->state); |
1da177e4 | 208 | list_add_tail(&sh->lru, &conf->handle_list); |
72626685 | 209 | } |
1da177e4 LT |
210 | md_wakeup_thread(conf->mddev->thread); |
211 | } else { | |
600aa109 | 212 | BUG_ON(stripe_operations_active(sh)); |
1da177e4 LT |
213 | if (test_and_clear_bit(STRIPE_PREREAD_ACTIVE, &sh->state)) { |
214 | atomic_dec(&conf->preread_active_stripes); | |
215 | if (atomic_read(&conf->preread_active_stripes) < IO_THRESHOLD) | |
216 | md_wakeup_thread(conf->mddev->thread); | |
217 | } | |
1da177e4 | 218 | atomic_dec(&conf->active_stripes); |
ccfcc3c1 N |
219 | if (!test_bit(STRIPE_EXPANDING, &sh->state)) { |
220 | list_add_tail(&sh->lru, &conf->inactive_list); | |
1da177e4 | 221 | wake_up(&conf->wait_for_stripe); |
46031f9a RBJ |
222 | if (conf->retry_read_aligned) |
223 | md_wakeup_thread(conf->mddev->thread); | |
ccfcc3c1 | 224 | } |
1da177e4 LT |
225 | } |
226 | } | |
227 | } | |
d0dabf7e | 228 | |
1da177e4 LT |
229 | static void release_stripe(struct stripe_head *sh) |
230 | { | |
231 | raid5_conf_t *conf = sh->raid_conf; | |
232 | unsigned long flags; | |
16a53ecc | 233 | |
1da177e4 LT |
234 | spin_lock_irqsave(&conf->device_lock, flags); |
235 | __release_stripe(conf, sh); | |
236 | spin_unlock_irqrestore(&conf->device_lock, flags); | |
237 | } | |
238 | ||
fccddba0 | 239 | static inline void remove_hash(struct stripe_head *sh) |
1da177e4 | 240 | { |
45b4233c DW |
241 | pr_debug("remove_hash(), stripe %llu\n", |
242 | (unsigned long long)sh->sector); | |
1da177e4 | 243 | |
fccddba0 | 244 | hlist_del_init(&sh->hash); |
1da177e4 LT |
245 | } |
246 | ||
16a53ecc | 247 | static inline void insert_hash(raid5_conf_t *conf, struct stripe_head *sh) |
1da177e4 | 248 | { |
fccddba0 | 249 | struct hlist_head *hp = stripe_hash(conf, sh->sector); |
1da177e4 | 250 | |
45b4233c DW |
251 | pr_debug("insert_hash(), stripe %llu\n", |
252 | (unsigned long long)sh->sector); | |
1da177e4 LT |
253 | |
254 | CHECK_DEVLOCK(); | |
fccddba0 | 255 | hlist_add_head(&sh->hash, hp); |
1da177e4 LT |
256 | } |
257 | ||
258 | ||
259 | /* find an idle stripe, make sure it is unhashed, and return it. */ | |
260 | static struct stripe_head *get_free_stripe(raid5_conf_t *conf) | |
261 | { | |
262 | struct stripe_head *sh = NULL; | |
263 | struct list_head *first; | |
264 | ||
265 | CHECK_DEVLOCK(); | |
266 | if (list_empty(&conf->inactive_list)) | |
267 | goto out; | |
268 | first = conf->inactive_list.next; | |
269 | sh = list_entry(first, struct stripe_head, lru); | |
270 | list_del_init(first); | |
271 | remove_hash(sh); | |
272 | atomic_inc(&conf->active_stripes); | |
273 | out: | |
274 | return sh; | |
275 | } | |
276 | ||
e4e11e38 | 277 | static void shrink_buffers(struct stripe_head *sh) |
1da177e4 LT |
278 | { |
279 | struct page *p; | |
280 | int i; | |
e4e11e38 | 281 | int num = sh->raid_conf->pool_size; |
1da177e4 | 282 | |
e4e11e38 | 283 | for (i = 0; i < num ; i++) { |
1da177e4 LT |
284 | p = sh->dev[i].page; |
285 | if (!p) | |
286 | continue; | |
287 | sh->dev[i].page = NULL; | |
2d1f3b5d | 288 | put_page(p); |
1da177e4 LT |
289 | } |
290 | } | |
291 | ||
e4e11e38 | 292 | static int grow_buffers(struct stripe_head *sh) |
1da177e4 LT |
293 | { |
294 | int i; | |
e4e11e38 | 295 | int num = sh->raid_conf->pool_size; |
1da177e4 | 296 | |
e4e11e38 | 297 | for (i = 0; i < num; i++) { |
1da177e4 LT |
298 | struct page *page; |
299 | ||
300 | if (!(page = alloc_page(GFP_KERNEL))) { | |
301 | return 1; | |
302 | } | |
303 | sh->dev[i].page = page; | |
304 | } | |
305 | return 0; | |
306 | } | |
307 | ||
784052ec | 308 | static void raid5_build_block(struct stripe_head *sh, int i, int previous); |
911d4ee8 N |
309 | static void stripe_set_idx(sector_t stripe, raid5_conf_t *conf, int previous, |
310 | struct stripe_head *sh); | |
1da177e4 | 311 | |
b5663ba4 | 312 | static void init_stripe(struct stripe_head *sh, sector_t sector, int previous) |
1da177e4 LT |
313 | { |
314 | raid5_conf_t *conf = sh->raid_conf; | |
7ecaa1e6 | 315 | int i; |
1da177e4 | 316 | |
78bafebd ES |
317 | BUG_ON(atomic_read(&sh->count) != 0); |
318 | BUG_ON(test_bit(STRIPE_HANDLE, &sh->state)); | |
600aa109 | 319 | BUG_ON(stripe_operations_active(sh)); |
d84e0f10 | 320 | |
1da177e4 | 321 | CHECK_DEVLOCK(); |
45b4233c | 322 | pr_debug("init_stripe called, stripe %llu\n", |
1da177e4 LT |
323 | (unsigned long long)sh->sector); |
324 | ||
325 | remove_hash(sh); | |
16a53ecc | 326 | |
86b42c71 | 327 | sh->generation = conf->generation - previous; |
b5663ba4 | 328 | sh->disks = previous ? conf->previous_raid_disks : conf->raid_disks; |
1da177e4 | 329 | sh->sector = sector; |
911d4ee8 | 330 | stripe_set_idx(sector, conf, previous, sh); |
1da177e4 LT |
331 | sh->state = 0; |
332 | ||
7ecaa1e6 N |
333 | |
334 | for (i = sh->disks; i--; ) { | |
1da177e4 LT |
335 | struct r5dev *dev = &sh->dev[i]; |
336 | ||
d84e0f10 | 337 | if (dev->toread || dev->read || dev->towrite || dev->written || |
1da177e4 | 338 | test_bit(R5_LOCKED, &dev->flags)) { |
d84e0f10 | 339 | printk(KERN_ERR "sector=%llx i=%d %p %p %p %p %d\n", |
1da177e4 | 340 | (unsigned long long)sh->sector, i, dev->toread, |
d84e0f10 | 341 | dev->read, dev->towrite, dev->written, |
1da177e4 | 342 | test_bit(R5_LOCKED, &dev->flags)); |
8cfa7b0f | 343 | WARN_ON(1); |
1da177e4 LT |
344 | } |
345 | dev->flags = 0; | |
784052ec | 346 | raid5_build_block(sh, i, previous); |
1da177e4 LT |
347 | } |
348 | insert_hash(conf, sh); | |
349 | } | |
350 | ||
86b42c71 N |
351 | static struct stripe_head *__find_stripe(raid5_conf_t *conf, sector_t sector, |
352 | short generation) | |
1da177e4 LT |
353 | { |
354 | struct stripe_head *sh; | |
fccddba0 | 355 | struct hlist_node *hn; |
1da177e4 LT |
356 | |
357 | CHECK_DEVLOCK(); | |
45b4233c | 358 | pr_debug("__find_stripe, sector %llu\n", (unsigned long long)sector); |
fccddba0 | 359 | hlist_for_each_entry(sh, hn, stripe_hash(conf, sector), hash) |
86b42c71 | 360 | if (sh->sector == sector && sh->generation == generation) |
1da177e4 | 361 | return sh; |
45b4233c | 362 | pr_debug("__stripe %llu not in cache\n", (unsigned long long)sector); |
1da177e4 LT |
363 | return NULL; |
364 | } | |
365 | ||
674806d6 N |
366 | /* |
367 | * Need to check if array has failed when deciding whether to: | |
368 | * - start an array | |
369 | * - remove non-faulty devices | |
370 | * - add a spare | |
371 | * - allow a reshape | |
372 | * This determination is simple when no reshape is happening. | |
373 | * However if there is a reshape, we need to carefully check | |
374 | * both the before and after sections. | |
375 | * This is because some failed devices may only affect one | |
376 | * of the two sections, and some non-in_sync devices may | |
377 | * be insync in the section most affected by failed devices. | |
378 | */ | |
379 | static int has_failed(raid5_conf_t *conf) | |
380 | { | |
381 | int degraded; | |
382 | int i; | |
383 | if (conf->mddev->reshape_position == MaxSector) | |
384 | return conf->mddev->degraded > conf->max_degraded; | |
385 | ||
386 | rcu_read_lock(); | |
387 | degraded = 0; | |
388 | for (i = 0; i < conf->previous_raid_disks; i++) { | |
389 | mdk_rdev_t *rdev = rcu_dereference(conf->disks[i].rdev); | |
390 | if (!rdev || test_bit(Faulty, &rdev->flags)) | |
391 | degraded++; | |
392 | else if (test_bit(In_sync, &rdev->flags)) | |
393 | ; | |
394 | else | |
395 | /* not in-sync or faulty. | |
396 | * If the reshape increases the number of devices, | |
397 | * this is being recovered by the reshape, so | |
398 | * this 'previous' section is not in_sync. | |
399 | * If the number of devices is being reduced however, | |
400 | * the device can only be part of the array if | |
401 | * we are reverting a reshape, so this section will | |
402 | * be in-sync. | |
403 | */ | |
404 | if (conf->raid_disks >= conf->previous_raid_disks) | |
405 | degraded++; | |
406 | } | |
407 | rcu_read_unlock(); | |
408 | if (degraded > conf->max_degraded) | |
409 | return 1; | |
410 | rcu_read_lock(); | |
411 | degraded = 0; | |
412 | for (i = 0; i < conf->raid_disks; i++) { | |
413 | mdk_rdev_t *rdev = rcu_dereference(conf->disks[i].rdev); | |
414 | if (!rdev || test_bit(Faulty, &rdev->flags)) | |
415 | degraded++; | |
416 | else if (test_bit(In_sync, &rdev->flags)) | |
417 | ; | |
418 | else | |
419 | /* not in-sync or faulty. | |
420 | * If reshape increases the number of devices, this | |
421 | * section has already been recovered, else it | |
422 | * almost certainly hasn't. | |
423 | */ | |
424 | if (conf->raid_disks <= conf->previous_raid_disks) | |
425 | degraded++; | |
426 | } | |
427 | rcu_read_unlock(); | |
428 | if (degraded > conf->max_degraded) | |
429 | return 1; | |
430 | return 0; | |
431 | } | |
432 | ||
b5663ba4 N |
433 | static struct stripe_head * |
434 | get_active_stripe(raid5_conf_t *conf, sector_t sector, | |
a8c906ca | 435 | int previous, int noblock, int noquiesce) |
1da177e4 LT |
436 | { |
437 | struct stripe_head *sh; | |
438 | ||
45b4233c | 439 | pr_debug("get_stripe, sector %llu\n", (unsigned long long)sector); |
1da177e4 LT |
440 | |
441 | spin_lock_irq(&conf->device_lock); | |
442 | ||
443 | do { | |
72626685 | 444 | wait_event_lock_irq(conf->wait_for_stripe, |
a8c906ca | 445 | conf->quiesce == 0 || noquiesce, |
72626685 | 446 | conf->device_lock, /* nothing */); |
86b42c71 | 447 | sh = __find_stripe(conf, sector, conf->generation - previous); |
1da177e4 LT |
448 | if (!sh) { |
449 | if (!conf->inactive_blocked) | |
450 | sh = get_free_stripe(conf); | |
451 | if (noblock && sh == NULL) | |
452 | break; | |
453 | if (!sh) { | |
454 | conf->inactive_blocked = 1; | |
455 | wait_event_lock_irq(conf->wait_for_stripe, | |
456 | !list_empty(&conf->inactive_list) && | |
5036805b N |
457 | (atomic_read(&conf->active_stripes) |
458 | < (conf->max_nr_stripes *3/4) | |
1da177e4 LT |
459 | || !conf->inactive_blocked), |
460 | conf->device_lock, | |
7c13edc8 | 461 | ); |
1da177e4 LT |
462 | conf->inactive_blocked = 0; |
463 | } else | |
b5663ba4 | 464 | init_stripe(sh, sector, previous); |
1da177e4 LT |
465 | } else { |
466 | if (atomic_read(&sh->count)) { | |
ab69ae12 N |
467 | BUG_ON(!list_empty(&sh->lru) |
468 | && !test_bit(STRIPE_EXPANDING, &sh->state)); | |
1da177e4 LT |
469 | } else { |
470 | if (!test_bit(STRIPE_HANDLE, &sh->state)) | |
471 | atomic_inc(&conf->active_stripes); | |
ff4e8d9a N |
472 | if (list_empty(&sh->lru) && |
473 | !test_bit(STRIPE_EXPANDING, &sh->state)) | |
16a53ecc N |
474 | BUG(); |
475 | list_del_init(&sh->lru); | |
1da177e4 LT |
476 | } |
477 | } | |
478 | } while (sh == NULL); | |
479 | ||
480 | if (sh) | |
481 | atomic_inc(&sh->count); | |
482 | ||
483 | spin_unlock_irq(&conf->device_lock); | |
484 | return sh; | |
485 | } | |
486 | ||
6712ecf8 N |
487 | static void |
488 | raid5_end_read_request(struct bio *bi, int error); | |
489 | static void | |
490 | raid5_end_write_request(struct bio *bi, int error); | |
91c00924 | 491 | |
c4e5ac0a | 492 | static void ops_run_io(struct stripe_head *sh, struct stripe_head_state *s) |
91c00924 DW |
493 | { |
494 | raid5_conf_t *conf = sh->raid_conf; | |
495 | int i, disks = sh->disks; | |
496 | ||
497 | might_sleep(); | |
498 | ||
499 | for (i = disks; i--; ) { | |
500 | int rw; | |
501 | struct bio *bi; | |
502 | mdk_rdev_t *rdev; | |
e9c7469b TH |
503 | if (test_and_clear_bit(R5_Wantwrite, &sh->dev[i].flags)) { |
504 | if (test_and_clear_bit(R5_WantFUA, &sh->dev[i].flags)) | |
505 | rw = WRITE_FUA; | |
506 | else | |
507 | rw = WRITE; | |
508 | } else if (test_and_clear_bit(R5_Wantread, &sh->dev[i].flags)) | |
91c00924 DW |
509 | rw = READ; |
510 | else | |
511 | continue; | |
512 | ||
513 | bi = &sh->dev[i].req; | |
514 | ||
515 | bi->bi_rw = rw; | |
b062962e | 516 | if (rw & WRITE) |
91c00924 DW |
517 | bi->bi_end_io = raid5_end_write_request; |
518 | else | |
519 | bi->bi_end_io = raid5_end_read_request; | |
520 | ||
521 | rcu_read_lock(); | |
522 | rdev = rcu_dereference(conf->disks[i].rdev); | |
523 | if (rdev && test_bit(Faulty, &rdev->flags)) | |
524 | rdev = NULL; | |
525 | if (rdev) | |
526 | atomic_inc(&rdev->nr_pending); | |
527 | rcu_read_unlock(); | |
528 | ||
73e92e51 N |
529 | /* We have already checked bad blocks for reads. Now |
530 | * need to check for writes. | |
531 | */ | |
532 | while ((rw & WRITE) && rdev && | |
533 | test_bit(WriteErrorSeen, &rdev->flags)) { | |
534 | sector_t first_bad; | |
535 | int bad_sectors; | |
536 | int bad = is_badblock(rdev, sh->sector, STRIPE_SECTORS, | |
537 | &first_bad, &bad_sectors); | |
538 | if (!bad) | |
539 | break; | |
540 | ||
541 | if (bad < 0) { | |
542 | set_bit(BlockedBadBlocks, &rdev->flags); | |
543 | if (!conf->mddev->external && | |
544 | conf->mddev->flags) { | |
545 | /* It is very unlikely, but we might | |
546 | * still need to write out the | |
547 | * bad block log - better give it | |
548 | * a chance*/ | |
549 | md_check_recovery(conf->mddev); | |
550 | } | |
551 | md_wait_for_blocked_rdev(rdev, conf->mddev); | |
552 | } else { | |
553 | /* Acknowledged bad block - skip the write */ | |
554 | rdev_dec_pending(rdev, conf->mddev); | |
555 | rdev = NULL; | |
556 | } | |
557 | } | |
558 | ||
91c00924 | 559 | if (rdev) { |
c4e5ac0a | 560 | if (s->syncing || s->expanding || s->expanded) |
91c00924 DW |
561 | md_sync_acct(rdev->bdev, STRIPE_SECTORS); |
562 | ||
2b7497f0 DW |
563 | set_bit(STRIPE_IO_STARTED, &sh->state); |
564 | ||
91c00924 DW |
565 | bi->bi_bdev = rdev->bdev; |
566 | pr_debug("%s: for %llu schedule op %ld on disc %d\n", | |
e46b272b | 567 | __func__, (unsigned long long)sh->sector, |
91c00924 DW |
568 | bi->bi_rw, i); |
569 | atomic_inc(&sh->count); | |
570 | bi->bi_sector = sh->sector + rdev->data_offset; | |
571 | bi->bi_flags = 1 << BIO_UPTODATE; | |
572 | bi->bi_vcnt = 1; | |
573 | bi->bi_max_vecs = 1; | |
574 | bi->bi_idx = 0; | |
575 | bi->bi_io_vec = &sh->dev[i].vec; | |
576 | bi->bi_io_vec[0].bv_len = STRIPE_SIZE; | |
577 | bi->bi_io_vec[0].bv_offset = 0; | |
578 | bi->bi_size = STRIPE_SIZE; | |
579 | bi->bi_next = NULL; | |
91c00924 DW |
580 | generic_make_request(bi); |
581 | } else { | |
b062962e | 582 | if (rw & WRITE) |
91c00924 DW |
583 | set_bit(STRIPE_DEGRADED, &sh->state); |
584 | pr_debug("skip op %ld on disc %d for sector %llu\n", | |
585 | bi->bi_rw, i, (unsigned long long)sh->sector); | |
586 | clear_bit(R5_LOCKED, &sh->dev[i].flags); | |
587 | set_bit(STRIPE_HANDLE, &sh->state); | |
588 | } | |
589 | } | |
590 | } | |
591 | ||
592 | static struct dma_async_tx_descriptor * | |
593 | async_copy_data(int frombio, struct bio *bio, struct page *page, | |
594 | sector_t sector, struct dma_async_tx_descriptor *tx) | |
595 | { | |
596 | struct bio_vec *bvl; | |
597 | struct page *bio_page; | |
598 | int i; | |
599 | int page_offset; | |
a08abd8c | 600 | struct async_submit_ctl submit; |
0403e382 | 601 | enum async_tx_flags flags = 0; |
91c00924 DW |
602 | |
603 | if (bio->bi_sector >= sector) | |
604 | page_offset = (signed)(bio->bi_sector - sector) * 512; | |
605 | else | |
606 | page_offset = (signed)(sector - bio->bi_sector) * -512; | |
a08abd8c | 607 | |
0403e382 DW |
608 | if (frombio) |
609 | flags |= ASYNC_TX_FENCE; | |
610 | init_async_submit(&submit, flags, tx, NULL, NULL, NULL); | |
611 | ||
91c00924 | 612 | bio_for_each_segment(bvl, bio, i) { |
fcde9075 | 613 | int len = bvl->bv_len; |
91c00924 DW |
614 | int clen; |
615 | int b_offset = 0; | |
616 | ||
617 | if (page_offset < 0) { | |
618 | b_offset = -page_offset; | |
619 | page_offset += b_offset; | |
620 | len -= b_offset; | |
621 | } | |
622 | ||
623 | if (len > 0 && page_offset + len > STRIPE_SIZE) | |
624 | clen = STRIPE_SIZE - page_offset; | |
625 | else | |
626 | clen = len; | |
627 | ||
628 | if (clen > 0) { | |
fcde9075 NK |
629 | b_offset += bvl->bv_offset; |
630 | bio_page = bvl->bv_page; | |
91c00924 DW |
631 | if (frombio) |
632 | tx = async_memcpy(page, bio_page, page_offset, | |
a08abd8c | 633 | b_offset, clen, &submit); |
91c00924 DW |
634 | else |
635 | tx = async_memcpy(bio_page, page, b_offset, | |
a08abd8c | 636 | page_offset, clen, &submit); |
91c00924 | 637 | } |
a08abd8c DW |
638 | /* chain the operations */ |
639 | submit.depend_tx = tx; | |
640 | ||
91c00924 DW |
641 | if (clen < len) /* hit end of page */ |
642 | break; | |
643 | page_offset += len; | |
644 | } | |
645 | ||
646 | return tx; | |
647 | } | |
648 | ||
649 | static void ops_complete_biofill(void *stripe_head_ref) | |
650 | { | |
651 | struct stripe_head *sh = stripe_head_ref; | |
652 | struct bio *return_bi = NULL; | |
653 | raid5_conf_t *conf = sh->raid_conf; | |
e4d84909 | 654 | int i; |
91c00924 | 655 | |
e46b272b | 656 | pr_debug("%s: stripe %llu\n", __func__, |
91c00924 DW |
657 | (unsigned long long)sh->sector); |
658 | ||
659 | /* clear completed biofills */ | |
83de75cc | 660 | spin_lock_irq(&conf->device_lock); |
91c00924 DW |
661 | for (i = sh->disks; i--; ) { |
662 | struct r5dev *dev = &sh->dev[i]; | |
91c00924 DW |
663 | |
664 | /* acknowledge completion of a biofill operation */ | |
e4d84909 DW |
665 | /* and check if we need to reply to a read request, |
666 | * new R5_Wantfill requests are held off until | |
83de75cc | 667 | * !STRIPE_BIOFILL_RUN |
e4d84909 DW |
668 | */ |
669 | if (test_and_clear_bit(R5_Wantfill, &dev->flags)) { | |
91c00924 | 670 | struct bio *rbi, *rbi2; |
91c00924 | 671 | |
91c00924 DW |
672 | BUG_ON(!dev->read); |
673 | rbi = dev->read; | |
674 | dev->read = NULL; | |
675 | while (rbi && rbi->bi_sector < | |
676 | dev->sector + STRIPE_SECTORS) { | |
677 | rbi2 = r5_next_bio(rbi, dev->sector); | |
960e739d | 678 | if (!raid5_dec_bi_phys_segments(rbi)) { |
91c00924 DW |
679 | rbi->bi_next = return_bi; |
680 | return_bi = rbi; | |
681 | } | |
91c00924 DW |
682 | rbi = rbi2; |
683 | } | |
684 | } | |
685 | } | |
83de75cc DW |
686 | spin_unlock_irq(&conf->device_lock); |
687 | clear_bit(STRIPE_BIOFILL_RUN, &sh->state); | |
91c00924 DW |
688 | |
689 | return_io(return_bi); | |
690 | ||
e4d84909 | 691 | set_bit(STRIPE_HANDLE, &sh->state); |
91c00924 DW |
692 | release_stripe(sh); |
693 | } | |
694 | ||
695 | static void ops_run_biofill(struct stripe_head *sh) | |
696 | { | |
697 | struct dma_async_tx_descriptor *tx = NULL; | |
698 | raid5_conf_t *conf = sh->raid_conf; | |
a08abd8c | 699 | struct async_submit_ctl submit; |
91c00924 DW |
700 | int i; |
701 | ||
e46b272b | 702 | pr_debug("%s: stripe %llu\n", __func__, |
91c00924 DW |
703 | (unsigned long long)sh->sector); |
704 | ||
705 | for (i = sh->disks; i--; ) { | |
706 | struct r5dev *dev = &sh->dev[i]; | |
707 | if (test_bit(R5_Wantfill, &dev->flags)) { | |
708 | struct bio *rbi; | |
709 | spin_lock_irq(&conf->device_lock); | |
710 | dev->read = rbi = dev->toread; | |
711 | dev->toread = NULL; | |
712 | spin_unlock_irq(&conf->device_lock); | |
713 | while (rbi && rbi->bi_sector < | |
714 | dev->sector + STRIPE_SECTORS) { | |
715 | tx = async_copy_data(0, rbi, dev->page, | |
716 | dev->sector, tx); | |
717 | rbi = r5_next_bio(rbi, dev->sector); | |
718 | } | |
719 | } | |
720 | } | |
721 | ||
722 | atomic_inc(&sh->count); | |
a08abd8c DW |
723 | init_async_submit(&submit, ASYNC_TX_ACK, tx, ops_complete_biofill, sh, NULL); |
724 | async_trigger_callback(&submit); | |
91c00924 DW |
725 | } |
726 | ||
4e7d2c0a | 727 | static void mark_target_uptodate(struct stripe_head *sh, int target) |
91c00924 | 728 | { |
4e7d2c0a | 729 | struct r5dev *tgt; |
91c00924 | 730 | |
4e7d2c0a DW |
731 | if (target < 0) |
732 | return; | |
91c00924 | 733 | |
4e7d2c0a | 734 | tgt = &sh->dev[target]; |
91c00924 DW |
735 | set_bit(R5_UPTODATE, &tgt->flags); |
736 | BUG_ON(!test_bit(R5_Wantcompute, &tgt->flags)); | |
737 | clear_bit(R5_Wantcompute, &tgt->flags); | |
4e7d2c0a DW |
738 | } |
739 | ||
ac6b53b6 | 740 | static void ops_complete_compute(void *stripe_head_ref) |
91c00924 DW |
741 | { |
742 | struct stripe_head *sh = stripe_head_ref; | |
91c00924 | 743 | |
e46b272b | 744 | pr_debug("%s: stripe %llu\n", __func__, |
91c00924 DW |
745 | (unsigned long long)sh->sector); |
746 | ||
ac6b53b6 | 747 | /* mark the computed target(s) as uptodate */ |
4e7d2c0a | 748 | mark_target_uptodate(sh, sh->ops.target); |
ac6b53b6 | 749 | mark_target_uptodate(sh, sh->ops.target2); |
4e7d2c0a | 750 | |
ecc65c9b DW |
751 | clear_bit(STRIPE_COMPUTE_RUN, &sh->state); |
752 | if (sh->check_state == check_state_compute_run) | |
753 | sh->check_state = check_state_compute_result; | |
91c00924 DW |
754 | set_bit(STRIPE_HANDLE, &sh->state); |
755 | release_stripe(sh); | |
756 | } | |
757 | ||
d6f38f31 DW |
758 | /* return a pointer to the address conversion region of the scribble buffer */ |
759 | static addr_conv_t *to_addr_conv(struct stripe_head *sh, | |
760 | struct raid5_percpu *percpu) | |
761 | { | |
762 | return percpu->scribble + sizeof(struct page *) * (sh->disks + 2); | |
763 | } | |
764 | ||
765 | static struct dma_async_tx_descriptor * | |
766 | ops_run_compute5(struct stripe_head *sh, struct raid5_percpu *percpu) | |
91c00924 | 767 | { |
91c00924 | 768 | int disks = sh->disks; |
d6f38f31 | 769 | struct page **xor_srcs = percpu->scribble; |
91c00924 DW |
770 | int target = sh->ops.target; |
771 | struct r5dev *tgt = &sh->dev[target]; | |
772 | struct page *xor_dest = tgt->page; | |
773 | int count = 0; | |
774 | struct dma_async_tx_descriptor *tx; | |
a08abd8c | 775 | struct async_submit_ctl submit; |
91c00924 DW |
776 | int i; |
777 | ||
778 | pr_debug("%s: stripe %llu block: %d\n", | |
e46b272b | 779 | __func__, (unsigned long long)sh->sector, target); |
91c00924 DW |
780 | BUG_ON(!test_bit(R5_Wantcompute, &tgt->flags)); |
781 | ||
782 | for (i = disks; i--; ) | |
783 | if (i != target) | |
784 | xor_srcs[count++] = sh->dev[i].page; | |
785 | ||
786 | atomic_inc(&sh->count); | |
787 | ||
0403e382 | 788 | init_async_submit(&submit, ASYNC_TX_FENCE|ASYNC_TX_XOR_ZERO_DST, NULL, |
ac6b53b6 | 789 | ops_complete_compute, sh, to_addr_conv(sh, percpu)); |
91c00924 | 790 | if (unlikely(count == 1)) |
a08abd8c | 791 | tx = async_memcpy(xor_dest, xor_srcs[0], 0, 0, STRIPE_SIZE, &submit); |
91c00924 | 792 | else |
a08abd8c | 793 | tx = async_xor(xor_dest, xor_srcs, 0, count, STRIPE_SIZE, &submit); |
91c00924 | 794 | |
91c00924 DW |
795 | return tx; |
796 | } | |
797 | ||
ac6b53b6 DW |
798 | /* set_syndrome_sources - populate source buffers for gen_syndrome |
799 | * @srcs - (struct page *) array of size sh->disks | |
800 | * @sh - stripe_head to parse | |
801 | * | |
802 | * Populates srcs in proper layout order for the stripe and returns the | |
803 | * 'count' of sources to be used in a call to async_gen_syndrome. The P | |
804 | * destination buffer is recorded in srcs[count] and the Q destination | |
805 | * is recorded in srcs[count+1]]. | |
806 | */ | |
807 | static int set_syndrome_sources(struct page **srcs, struct stripe_head *sh) | |
808 | { | |
809 | int disks = sh->disks; | |
810 | int syndrome_disks = sh->ddf_layout ? disks : (disks - 2); | |
811 | int d0_idx = raid6_d0(sh); | |
812 | int count; | |
813 | int i; | |
814 | ||
815 | for (i = 0; i < disks; i++) | |
5dd33c9a | 816 | srcs[i] = NULL; |
ac6b53b6 DW |
817 | |
818 | count = 0; | |
819 | i = d0_idx; | |
820 | do { | |
821 | int slot = raid6_idx_to_slot(i, sh, &count, syndrome_disks); | |
822 | ||
823 | srcs[slot] = sh->dev[i].page; | |
824 | i = raid6_next_disk(i, disks); | |
825 | } while (i != d0_idx); | |
ac6b53b6 | 826 | |
e4424fee | 827 | return syndrome_disks; |
ac6b53b6 DW |
828 | } |
829 | ||
830 | static struct dma_async_tx_descriptor * | |
831 | ops_run_compute6_1(struct stripe_head *sh, struct raid5_percpu *percpu) | |
832 | { | |
833 | int disks = sh->disks; | |
834 | struct page **blocks = percpu->scribble; | |
835 | int target; | |
836 | int qd_idx = sh->qd_idx; | |
837 | struct dma_async_tx_descriptor *tx; | |
838 | struct async_submit_ctl submit; | |
839 | struct r5dev *tgt; | |
840 | struct page *dest; | |
841 | int i; | |
842 | int count; | |
843 | ||
844 | if (sh->ops.target < 0) | |
845 | target = sh->ops.target2; | |
846 | else if (sh->ops.target2 < 0) | |
847 | target = sh->ops.target; | |
91c00924 | 848 | else |
ac6b53b6 DW |
849 | /* we should only have one valid target */ |
850 | BUG(); | |
851 | BUG_ON(target < 0); | |
852 | pr_debug("%s: stripe %llu block: %d\n", | |
853 | __func__, (unsigned long long)sh->sector, target); | |
854 | ||
855 | tgt = &sh->dev[target]; | |
856 | BUG_ON(!test_bit(R5_Wantcompute, &tgt->flags)); | |
857 | dest = tgt->page; | |
858 | ||
859 | atomic_inc(&sh->count); | |
860 | ||
861 | if (target == qd_idx) { | |
862 | count = set_syndrome_sources(blocks, sh); | |
863 | blocks[count] = NULL; /* regenerating p is not necessary */ | |
864 | BUG_ON(blocks[count+1] != dest); /* q should already be set */ | |
0403e382 DW |
865 | init_async_submit(&submit, ASYNC_TX_FENCE, NULL, |
866 | ops_complete_compute, sh, | |
ac6b53b6 DW |
867 | to_addr_conv(sh, percpu)); |
868 | tx = async_gen_syndrome(blocks, 0, count+2, STRIPE_SIZE, &submit); | |
869 | } else { | |
870 | /* Compute any data- or p-drive using XOR */ | |
871 | count = 0; | |
872 | for (i = disks; i-- ; ) { | |
873 | if (i == target || i == qd_idx) | |
874 | continue; | |
875 | blocks[count++] = sh->dev[i].page; | |
876 | } | |
877 | ||
0403e382 DW |
878 | init_async_submit(&submit, ASYNC_TX_FENCE|ASYNC_TX_XOR_ZERO_DST, |
879 | NULL, ops_complete_compute, sh, | |
ac6b53b6 DW |
880 | to_addr_conv(sh, percpu)); |
881 | tx = async_xor(dest, blocks, 0, count, STRIPE_SIZE, &submit); | |
882 | } | |
91c00924 | 883 | |
91c00924 DW |
884 | return tx; |
885 | } | |
886 | ||
ac6b53b6 DW |
887 | static struct dma_async_tx_descriptor * |
888 | ops_run_compute6_2(struct stripe_head *sh, struct raid5_percpu *percpu) | |
889 | { | |
890 | int i, count, disks = sh->disks; | |
891 | int syndrome_disks = sh->ddf_layout ? disks : disks-2; | |
892 | int d0_idx = raid6_d0(sh); | |
893 | int faila = -1, failb = -1; | |
894 | int target = sh->ops.target; | |
895 | int target2 = sh->ops.target2; | |
896 | struct r5dev *tgt = &sh->dev[target]; | |
897 | struct r5dev *tgt2 = &sh->dev[target2]; | |
898 | struct dma_async_tx_descriptor *tx; | |
899 | struct page **blocks = percpu->scribble; | |
900 | struct async_submit_ctl submit; | |
901 | ||
902 | pr_debug("%s: stripe %llu block1: %d block2: %d\n", | |
903 | __func__, (unsigned long long)sh->sector, target, target2); | |
904 | BUG_ON(target < 0 || target2 < 0); | |
905 | BUG_ON(!test_bit(R5_Wantcompute, &tgt->flags)); | |
906 | BUG_ON(!test_bit(R5_Wantcompute, &tgt2->flags)); | |
907 | ||
6c910a78 | 908 | /* we need to open-code set_syndrome_sources to handle the |
ac6b53b6 DW |
909 | * slot number conversion for 'faila' and 'failb' |
910 | */ | |
911 | for (i = 0; i < disks ; i++) | |
5dd33c9a | 912 | blocks[i] = NULL; |
ac6b53b6 DW |
913 | count = 0; |
914 | i = d0_idx; | |
915 | do { | |
916 | int slot = raid6_idx_to_slot(i, sh, &count, syndrome_disks); | |
917 | ||
918 | blocks[slot] = sh->dev[i].page; | |
919 | ||
920 | if (i == target) | |
921 | faila = slot; | |
922 | if (i == target2) | |
923 | failb = slot; | |
924 | i = raid6_next_disk(i, disks); | |
925 | } while (i != d0_idx); | |
ac6b53b6 DW |
926 | |
927 | BUG_ON(faila == failb); | |
928 | if (failb < faila) | |
929 | swap(faila, failb); | |
930 | pr_debug("%s: stripe: %llu faila: %d failb: %d\n", | |
931 | __func__, (unsigned long long)sh->sector, faila, failb); | |
932 | ||
933 | atomic_inc(&sh->count); | |
934 | ||
935 | if (failb == syndrome_disks+1) { | |
936 | /* Q disk is one of the missing disks */ | |
937 | if (faila == syndrome_disks) { | |
938 | /* Missing P+Q, just recompute */ | |
0403e382 DW |
939 | init_async_submit(&submit, ASYNC_TX_FENCE, NULL, |
940 | ops_complete_compute, sh, | |
941 | to_addr_conv(sh, percpu)); | |
e4424fee | 942 | return async_gen_syndrome(blocks, 0, syndrome_disks+2, |
ac6b53b6 DW |
943 | STRIPE_SIZE, &submit); |
944 | } else { | |
945 | struct page *dest; | |
946 | int data_target; | |
947 | int qd_idx = sh->qd_idx; | |
948 | ||
949 | /* Missing D+Q: recompute D from P, then recompute Q */ | |
950 | if (target == qd_idx) | |
951 | data_target = target2; | |
952 | else | |
953 | data_target = target; | |
954 | ||
955 | count = 0; | |
956 | for (i = disks; i-- ; ) { | |
957 | if (i == data_target || i == qd_idx) | |
958 | continue; | |
959 | blocks[count++] = sh->dev[i].page; | |
960 | } | |
961 | dest = sh->dev[data_target].page; | |
0403e382 DW |
962 | init_async_submit(&submit, |
963 | ASYNC_TX_FENCE|ASYNC_TX_XOR_ZERO_DST, | |
964 | NULL, NULL, NULL, | |
965 | to_addr_conv(sh, percpu)); | |
ac6b53b6 DW |
966 | tx = async_xor(dest, blocks, 0, count, STRIPE_SIZE, |
967 | &submit); | |
968 | ||
969 | count = set_syndrome_sources(blocks, sh); | |
0403e382 DW |
970 | init_async_submit(&submit, ASYNC_TX_FENCE, tx, |
971 | ops_complete_compute, sh, | |
972 | to_addr_conv(sh, percpu)); | |
ac6b53b6 DW |
973 | return async_gen_syndrome(blocks, 0, count+2, |
974 | STRIPE_SIZE, &submit); | |
975 | } | |
ac6b53b6 | 976 | } else { |
6c910a78 DW |
977 | init_async_submit(&submit, ASYNC_TX_FENCE, NULL, |
978 | ops_complete_compute, sh, | |
979 | to_addr_conv(sh, percpu)); | |
980 | if (failb == syndrome_disks) { | |
981 | /* We're missing D+P. */ | |
982 | return async_raid6_datap_recov(syndrome_disks+2, | |
983 | STRIPE_SIZE, faila, | |
984 | blocks, &submit); | |
985 | } else { | |
986 | /* We're missing D+D. */ | |
987 | return async_raid6_2data_recov(syndrome_disks+2, | |
988 | STRIPE_SIZE, faila, failb, | |
989 | blocks, &submit); | |
990 | } | |
ac6b53b6 DW |
991 | } |
992 | } | |
993 | ||
994 | ||
91c00924 DW |
995 | static void ops_complete_prexor(void *stripe_head_ref) |
996 | { | |
997 | struct stripe_head *sh = stripe_head_ref; | |
998 | ||
e46b272b | 999 | pr_debug("%s: stripe %llu\n", __func__, |
91c00924 | 1000 | (unsigned long long)sh->sector); |
91c00924 DW |
1001 | } |
1002 | ||
1003 | static struct dma_async_tx_descriptor * | |
d6f38f31 DW |
1004 | ops_run_prexor(struct stripe_head *sh, struct raid5_percpu *percpu, |
1005 | struct dma_async_tx_descriptor *tx) | |
91c00924 | 1006 | { |
91c00924 | 1007 | int disks = sh->disks; |
d6f38f31 | 1008 | struct page **xor_srcs = percpu->scribble; |
91c00924 | 1009 | int count = 0, pd_idx = sh->pd_idx, i; |
a08abd8c | 1010 | struct async_submit_ctl submit; |
91c00924 DW |
1011 | |
1012 | /* existing parity data subtracted */ | |
1013 | struct page *xor_dest = xor_srcs[count++] = sh->dev[pd_idx].page; | |
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 | /* Only process blocks that are known to be uptodate */ | |
d8ee0728 | 1021 | if (test_bit(R5_Wantdrain, &dev->flags)) |
91c00924 DW |
1022 | xor_srcs[count++] = dev->page; |
1023 | } | |
1024 | ||
0403e382 | 1025 | init_async_submit(&submit, ASYNC_TX_FENCE|ASYNC_TX_XOR_DROP_DST, tx, |
d6f38f31 | 1026 | ops_complete_prexor, sh, to_addr_conv(sh, percpu)); |
a08abd8c | 1027 | tx = async_xor(xor_dest, xor_srcs, 0, count, STRIPE_SIZE, &submit); |
91c00924 DW |
1028 | |
1029 | return tx; | |
1030 | } | |
1031 | ||
1032 | static struct dma_async_tx_descriptor * | |
d8ee0728 | 1033 | ops_run_biodrain(struct stripe_head *sh, struct dma_async_tx_descriptor *tx) |
91c00924 DW |
1034 | { |
1035 | int disks = sh->disks; | |
d8ee0728 | 1036 | int i; |
91c00924 | 1037 | |
e46b272b | 1038 | pr_debug("%s: stripe %llu\n", __func__, |
91c00924 DW |
1039 | (unsigned long long)sh->sector); |
1040 | ||
1041 | for (i = disks; i--; ) { | |
1042 | struct r5dev *dev = &sh->dev[i]; | |
1043 | struct bio *chosen; | |
91c00924 | 1044 | |
d8ee0728 | 1045 | if (test_and_clear_bit(R5_Wantdrain, &dev->flags)) { |
91c00924 DW |
1046 | struct bio *wbi; |
1047 | ||
cbe47ec5 | 1048 | spin_lock_irq(&sh->raid_conf->device_lock); |
91c00924 DW |
1049 | chosen = dev->towrite; |
1050 | dev->towrite = NULL; | |
1051 | BUG_ON(dev->written); | |
1052 | wbi = dev->written = chosen; | |
cbe47ec5 | 1053 | spin_unlock_irq(&sh->raid_conf->device_lock); |
91c00924 DW |
1054 | |
1055 | while (wbi && wbi->bi_sector < | |
1056 | dev->sector + STRIPE_SECTORS) { | |
e9c7469b TH |
1057 | if (wbi->bi_rw & REQ_FUA) |
1058 | set_bit(R5_WantFUA, &dev->flags); | |
91c00924 DW |
1059 | tx = async_copy_data(1, wbi, dev->page, |
1060 | dev->sector, tx); | |
1061 | wbi = r5_next_bio(wbi, dev->sector); | |
1062 | } | |
1063 | } | |
1064 | } | |
1065 | ||
1066 | return tx; | |
1067 | } | |
1068 | ||
ac6b53b6 | 1069 | static void ops_complete_reconstruct(void *stripe_head_ref) |
91c00924 DW |
1070 | { |
1071 | struct stripe_head *sh = stripe_head_ref; | |
ac6b53b6 DW |
1072 | int disks = sh->disks; |
1073 | int pd_idx = sh->pd_idx; | |
1074 | int qd_idx = sh->qd_idx; | |
1075 | int i; | |
e9c7469b | 1076 | bool fua = false; |
91c00924 | 1077 | |
e46b272b | 1078 | pr_debug("%s: stripe %llu\n", __func__, |
91c00924 DW |
1079 | (unsigned long long)sh->sector); |
1080 | ||
e9c7469b TH |
1081 | for (i = disks; i--; ) |
1082 | fua |= test_bit(R5_WantFUA, &sh->dev[i].flags); | |
1083 | ||
91c00924 DW |
1084 | for (i = disks; i--; ) { |
1085 | struct r5dev *dev = &sh->dev[i]; | |
ac6b53b6 | 1086 | |
e9c7469b | 1087 | if (dev->written || i == pd_idx || i == qd_idx) { |
91c00924 | 1088 | set_bit(R5_UPTODATE, &dev->flags); |
e9c7469b TH |
1089 | if (fua) |
1090 | set_bit(R5_WantFUA, &dev->flags); | |
1091 | } | |
91c00924 DW |
1092 | } |
1093 | ||
d8ee0728 DW |
1094 | if (sh->reconstruct_state == reconstruct_state_drain_run) |
1095 | sh->reconstruct_state = reconstruct_state_drain_result; | |
1096 | else if (sh->reconstruct_state == reconstruct_state_prexor_drain_run) | |
1097 | sh->reconstruct_state = reconstruct_state_prexor_drain_result; | |
1098 | else { | |
1099 | BUG_ON(sh->reconstruct_state != reconstruct_state_run); | |
1100 | sh->reconstruct_state = reconstruct_state_result; | |
1101 | } | |
91c00924 DW |
1102 | |
1103 | set_bit(STRIPE_HANDLE, &sh->state); | |
1104 | release_stripe(sh); | |
1105 | } | |
1106 | ||
1107 | static void | |
ac6b53b6 DW |
1108 | ops_run_reconstruct5(struct stripe_head *sh, struct raid5_percpu *percpu, |
1109 | struct dma_async_tx_descriptor *tx) | |
91c00924 | 1110 | { |
91c00924 | 1111 | int disks = sh->disks; |
d6f38f31 | 1112 | struct page **xor_srcs = percpu->scribble; |
a08abd8c | 1113 | struct async_submit_ctl submit; |
91c00924 DW |
1114 | int count = 0, pd_idx = sh->pd_idx, i; |
1115 | struct page *xor_dest; | |
d8ee0728 | 1116 | int prexor = 0; |
91c00924 | 1117 | unsigned long flags; |
91c00924 | 1118 | |
e46b272b | 1119 | pr_debug("%s: stripe %llu\n", __func__, |
91c00924 DW |
1120 | (unsigned long long)sh->sector); |
1121 | ||
1122 | /* check if prexor is active which means only process blocks | |
1123 | * that are part of a read-modify-write (written) | |
1124 | */ | |
d8ee0728 DW |
1125 | if (sh->reconstruct_state == reconstruct_state_prexor_drain_run) { |
1126 | prexor = 1; | |
91c00924 DW |
1127 | xor_dest = xor_srcs[count++] = sh->dev[pd_idx].page; |
1128 | for (i = disks; i--; ) { | |
1129 | struct r5dev *dev = &sh->dev[i]; | |
1130 | if (dev->written) | |
1131 | xor_srcs[count++] = dev->page; | |
1132 | } | |
1133 | } else { | |
1134 | xor_dest = sh->dev[pd_idx].page; | |
1135 | for (i = disks; i--; ) { | |
1136 | struct r5dev *dev = &sh->dev[i]; | |
1137 | if (i != pd_idx) | |
1138 | xor_srcs[count++] = dev->page; | |
1139 | } | |
1140 | } | |
1141 | ||
91c00924 DW |
1142 | /* 1/ if we prexor'd then the dest is reused as a source |
1143 | * 2/ if we did not prexor then we are redoing the parity | |
1144 | * set ASYNC_TX_XOR_DROP_DST and ASYNC_TX_XOR_ZERO_DST | |
1145 | * for the synchronous xor case | |
1146 | */ | |
88ba2aa5 | 1147 | flags = ASYNC_TX_ACK | |
91c00924 DW |
1148 | (prexor ? ASYNC_TX_XOR_DROP_DST : ASYNC_TX_XOR_ZERO_DST); |
1149 | ||
1150 | atomic_inc(&sh->count); | |
1151 | ||
ac6b53b6 | 1152 | init_async_submit(&submit, flags, tx, ops_complete_reconstruct, sh, |
d6f38f31 | 1153 | to_addr_conv(sh, percpu)); |
a08abd8c DW |
1154 | if (unlikely(count == 1)) |
1155 | tx = async_memcpy(xor_dest, xor_srcs[0], 0, 0, STRIPE_SIZE, &submit); | |
1156 | else | |
1157 | tx = async_xor(xor_dest, xor_srcs, 0, count, STRIPE_SIZE, &submit); | |
91c00924 DW |
1158 | } |
1159 | ||
ac6b53b6 DW |
1160 | static void |
1161 | ops_run_reconstruct6(struct stripe_head *sh, struct raid5_percpu *percpu, | |
1162 | struct dma_async_tx_descriptor *tx) | |
1163 | { | |
1164 | struct async_submit_ctl submit; | |
1165 | struct page **blocks = percpu->scribble; | |
1166 | int count; | |
1167 | ||
1168 | pr_debug("%s: stripe %llu\n", __func__, (unsigned long long)sh->sector); | |
1169 | ||
1170 | count = set_syndrome_sources(blocks, sh); | |
1171 | ||
1172 | atomic_inc(&sh->count); | |
1173 | ||
1174 | init_async_submit(&submit, ASYNC_TX_ACK, tx, ops_complete_reconstruct, | |
1175 | sh, to_addr_conv(sh, percpu)); | |
1176 | async_gen_syndrome(blocks, 0, count+2, STRIPE_SIZE, &submit); | |
91c00924 DW |
1177 | } |
1178 | ||
1179 | static void ops_complete_check(void *stripe_head_ref) | |
1180 | { | |
1181 | struct stripe_head *sh = stripe_head_ref; | |
91c00924 | 1182 | |
e46b272b | 1183 | pr_debug("%s: stripe %llu\n", __func__, |
91c00924 DW |
1184 | (unsigned long long)sh->sector); |
1185 | ||
ecc65c9b | 1186 | sh->check_state = check_state_check_result; |
91c00924 DW |
1187 | set_bit(STRIPE_HANDLE, &sh->state); |
1188 | release_stripe(sh); | |
1189 | } | |
1190 | ||
ac6b53b6 | 1191 | static void ops_run_check_p(struct stripe_head *sh, struct raid5_percpu *percpu) |
91c00924 | 1192 | { |
91c00924 | 1193 | int disks = sh->disks; |
ac6b53b6 DW |
1194 | int pd_idx = sh->pd_idx; |
1195 | int qd_idx = sh->qd_idx; | |
1196 | struct page *xor_dest; | |
d6f38f31 | 1197 | struct page **xor_srcs = percpu->scribble; |
91c00924 | 1198 | struct dma_async_tx_descriptor *tx; |
a08abd8c | 1199 | struct async_submit_ctl submit; |
ac6b53b6 DW |
1200 | int count; |
1201 | int i; | |
91c00924 | 1202 | |
e46b272b | 1203 | pr_debug("%s: stripe %llu\n", __func__, |
91c00924 DW |
1204 | (unsigned long long)sh->sector); |
1205 | ||
ac6b53b6 DW |
1206 | count = 0; |
1207 | xor_dest = sh->dev[pd_idx].page; | |
1208 | xor_srcs[count++] = xor_dest; | |
91c00924 | 1209 | for (i = disks; i--; ) { |
ac6b53b6 DW |
1210 | if (i == pd_idx || i == qd_idx) |
1211 | continue; | |
1212 | xor_srcs[count++] = sh->dev[i].page; | |
91c00924 DW |
1213 | } |
1214 | ||
d6f38f31 DW |
1215 | init_async_submit(&submit, 0, NULL, NULL, NULL, |
1216 | to_addr_conv(sh, percpu)); | |
099f53cb | 1217 | tx = async_xor_val(xor_dest, xor_srcs, 0, count, STRIPE_SIZE, |
a08abd8c | 1218 | &sh->ops.zero_sum_result, &submit); |
91c00924 | 1219 | |
91c00924 | 1220 | atomic_inc(&sh->count); |
a08abd8c DW |
1221 | init_async_submit(&submit, ASYNC_TX_ACK, tx, ops_complete_check, sh, NULL); |
1222 | tx = async_trigger_callback(&submit); | |
91c00924 DW |
1223 | } |
1224 | ||
ac6b53b6 DW |
1225 | static void ops_run_check_pq(struct stripe_head *sh, struct raid5_percpu *percpu, int checkp) |
1226 | { | |
1227 | struct page **srcs = percpu->scribble; | |
1228 | struct async_submit_ctl submit; | |
1229 | int count; | |
1230 | ||
1231 | pr_debug("%s: stripe %llu checkp: %d\n", __func__, | |
1232 | (unsigned long long)sh->sector, checkp); | |
1233 | ||
1234 | count = set_syndrome_sources(srcs, sh); | |
1235 | if (!checkp) | |
1236 | srcs[count] = NULL; | |
91c00924 | 1237 | |
91c00924 | 1238 | atomic_inc(&sh->count); |
ac6b53b6 DW |
1239 | init_async_submit(&submit, ASYNC_TX_ACK, NULL, ops_complete_check, |
1240 | sh, to_addr_conv(sh, percpu)); | |
1241 | async_syndrome_val(srcs, 0, count+2, STRIPE_SIZE, | |
1242 | &sh->ops.zero_sum_result, percpu->spare_page, &submit); | |
91c00924 DW |
1243 | } |
1244 | ||
417b8d4a | 1245 | static void __raid_run_ops(struct stripe_head *sh, unsigned long ops_request) |
91c00924 DW |
1246 | { |
1247 | int overlap_clear = 0, i, disks = sh->disks; | |
1248 | struct dma_async_tx_descriptor *tx = NULL; | |
d6f38f31 | 1249 | raid5_conf_t *conf = sh->raid_conf; |
ac6b53b6 | 1250 | int level = conf->level; |
d6f38f31 DW |
1251 | struct raid5_percpu *percpu; |
1252 | unsigned long cpu; | |
91c00924 | 1253 | |
d6f38f31 DW |
1254 | cpu = get_cpu(); |
1255 | percpu = per_cpu_ptr(conf->percpu, cpu); | |
83de75cc | 1256 | if (test_bit(STRIPE_OP_BIOFILL, &ops_request)) { |
91c00924 DW |
1257 | ops_run_biofill(sh); |
1258 | overlap_clear++; | |
1259 | } | |
1260 | ||
7b3a871e | 1261 | if (test_bit(STRIPE_OP_COMPUTE_BLK, &ops_request)) { |
ac6b53b6 DW |
1262 | if (level < 6) |
1263 | tx = ops_run_compute5(sh, percpu); | |
1264 | else { | |
1265 | if (sh->ops.target2 < 0 || sh->ops.target < 0) | |
1266 | tx = ops_run_compute6_1(sh, percpu); | |
1267 | else | |
1268 | tx = ops_run_compute6_2(sh, percpu); | |
1269 | } | |
1270 | /* terminate the chain if reconstruct is not set to be run */ | |
1271 | if (tx && !test_bit(STRIPE_OP_RECONSTRUCT, &ops_request)) | |
7b3a871e DW |
1272 | async_tx_ack(tx); |
1273 | } | |
91c00924 | 1274 | |
600aa109 | 1275 | if (test_bit(STRIPE_OP_PREXOR, &ops_request)) |
d6f38f31 | 1276 | tx = ops_run_prexor(sh, percpu, tx); |
91c00924 | 1277 | |
600aa109 | 1278 | if (test_bit(STRIPE_OP_BIODRAIN, &ops_request)) { |
d8ee0728 | 1279 | tx = ops_run_biodrain(sh, tx); |
91c00924 DW |
1280 | overlap_clear++; |
1281 | } | |
1282 | ||
ac6b53b6 DW |
1283 | if (test_bit(STRIPE_OP_RECONSTRUCT, &ops_request)) { |
1284 | if (level < 6) | |
1285 | ops_run_reconstruct5(sh, percpu, tx); | |
1286 | else | |
1287 | ops_run_reconstruct6(sh, percpu, tx); | |
1288 | } | |
91c00924 | 1289 | |
ac6b53b6 DW |
1290 | if (test_bit(STRIPE_OP_CHECK, &ops_request)) { |
1291 | if (sh->check_state == check_state_run) | |
1292 | ops_run_check_p(sh, percpu); | |
1293 | else if (sh->check_state == check_state_run_q) | |
1294 | ops_run_check_pq(sh, percpu, 0); | |
1295 | else if (sh->check_state == check_state_run_pq) | |
1296 | ops_run_check_pq(sh, percpu, 1); | |
1297 | else | |
1298 | BUG(); | |
1299 | } | |
91c00924 | 1300 | |
91c00924 DW |
1301 | if (overlap_clear) |
1302 | for (i = disks; i--; ) { | |
1303 | struct r5dev *dev = &sh->dev[i]; | |
1304 | if (test_and_clear_bit(R5_Overlap, &dev->flags)) | |
1305 | wake_up(&sh->raid_conf->wait_for_overlap); | |
1306 | } | |
d6f38f31 | 1307 | put_cpu(); |
91c00924 DW |
1308 | } |
1309 | ||
417b8d4a DW |
1310 | #ifdef CONFIG_MULTICORE_RAID456 |
1311 | static void async_run_ops(void *param, async_cookie_t cookie) | |
1312 | { | |
1313 | struct stripe_head *sh = param; | |
1314 | unsigned long ops_request = sh->ops.request; | |
1315 | ||
1316 | clear_bit_unlock(STRIPE_OPS_REQ_PENDING, &sh->state); | |
1317 | wake_up(&sh->ops.wait_for_ops); | |
1318 | ||
1319 | __raid_run_ops(sh, ops_request); | |
1320 | release_stripe(sh); | |
1321 | } | |
1322 | ||
1323 | static void raid_run_ops(struct stripe_head *sh, unsigned long ops_request) | |
1324 | { | |
1325 | /* since handle_stripe can be called outside of raid5d context | |
1326 | * we need to ensure sh->ops.request is de-staged before another | |
1327 | * request arrives | |
1328 | */ | |
1329 | wait_event(sh->ops.wait_for_ops, | |
1330 | !test_and_set_bit_lock(STRIPE_OPS_REQ_PENDING, &sh->state)); | |
1331 | sh->ops.request = ops_request; | |
1332 | ||
1333 | atomic_inc(&sh->count); | |
1334 | async_schedule(async_run_ops, sh); | |
1335 | } | |
1336 | #else | |
1337 | #define raid_run_ops __raid_run_ops | |
1338 | #endif | |
1339 | ||
3f294f4f | 1340 | static int grow_one_stripe(raid5_conf_t *conf) |
1da177e4 LT |
1341 | { |
1342 | struct stripe_head *sh; | |
6ce32846 | 1343 | sh = kmem_cache_zalloc(conf->slab_cache, GFP_KERNEL); |
3f294f4f N |
1344 | if (!sh) |
1345 | return 0; | |
6ce32846 | 1346 | |
3f294f4f | 1347 | sh->raid_conf = conf; |
417b8d4a DW |
1348 | #ifdef CONFIG_MULTICORE_RAID456 |
1349 | init_waitqueue_head(&sh->ops.wait_for_ops); | |
1350 | #endif | |
3f294f4f | 1351 | |
e4e11e38 N |
1352 | if (grow_buffers(sh)) { |
1353 | shrink_buffers(sh); | |
3f294f4f N |
1354 | kmem_cache_free(conf->slab_cache, sh); |
1355 | return 0; | |
1356 | } | |
1357 | /* we just created an active stripe so... */ | |
1358 | atomic_set(&sh->count, 1); | |
1359 | atomic_inc(&conf->active_stripes); | |
1360 | INIT_LIST_HEAD(&sh->lru); | |
1361 | release_stripe(sh); | |
1362 | return 1; | |
1363 | } | |
1364 | ||
1365 | static int grow_stripes(raid5_conf_t *conf, int num) | |
1366 | { | |
e18b890b | 1367 | struct kmem_cache *sc; |
5e5e3e78 | 1368 | int devs = max(conf->raid_disks, conf->previous_raid_disks); |
1da177e4 | 1369 | |
f4be6b43 N |
1370 | if (conf->mddev->gendisk) |
1371 | sprintf(conf->cache_name[0], | |
1372 | "raid%d-%s", conf->level, mdname(conf->mddev)); | |
1373 | else | |
1374 | sprintf(conf->cache_name[0], | |
1375 | "raid%d-%p", conf->level, conf->mddev); | |
1376 | sprintf(conf->cache_name[1], "%s-alt", conf->cache_name[0]); | |
1377 | ||
ad01c9e3 N |
1378 | conf->active_name = 0; |
1379 | sc = kmem_cache_create(conf->cache_name[conf->active_name], | |
1da177e4 | 1380 | sizeof(struct stripe_head)+(devs-1)*sizeof(struct r5dev), |
20c2df83 | 1381 | 0, 0, NULL); |
1da177e4 LT |
1382 | if (!sc) |
1383 | return 1; | |
1384 | conf->slab_cache = sc; | |
ad01c9e3 | 1385 | conf->pool_size = devs; |
16a53ecc | 1386 | while (num--) |
3f294f4f | 1387 | if (!grow_one_stripe(conf)) |
1da177e4 | 1388 | return 1; |
1da177e4 LT |
1389 | return 0; |
1390 | } | |
29269553 | 1391 | |
d6f38f31 DW |
1392 | /** |
1393 | * scribble_len - return the required size of the scribble region | |
1394 | * @num - total number of disks in the array | |
1395 | * | |
1396 | * The size must be enough to contain: | |
1397 | * 1/ a struct page pointer for each device in the array +2 | |
1398 | * 2/ room to convert each entry in (1) to its corresponding dma | |
1399 | * (dma_map_page()) or page (page_address()) address. | |
1400 | * | |
1401 | * Note: the +2 is for the destination buffers of the ddf/raid6 case where we | |
1402 | * calculate over all devices (not just the data blocks), using zeros in place | |
1403 | * of the P and Q blocks. | |
1404 | */ | |
1405 | static size_t scribble_len(int num) | |
1406 | { | |
1407 | size_t len; | |
1408 | ||
1409 | len = sizeof(struct page *) * (num+2) + sizeof(addr_conv_t) * (num+2); | |
1410 | ||
1411 | return len; | |
1412 | } | |
1413 | ||
ad01c9e3 N |
1414 | static int resize_stripes(raid5_conf_t *conf, int newsize) |
1415 | { | |
1416 | /* Make all the stripes able to hold 'newsize' devices. | |
1417 | * New slots in each stripe get 'page' set to a new page. | |
1418 | * | |
1419 | * This happens in stages: | |
1420 | * 1/ create a new kmem_cache and allocate the required number of | |
1421 | * stripe_heads. | |
1422 | * 2/ gather all the old stripe_heads and tranfer the pages across | |
1423 | * to the new stripe_heads. This will have the side effect of | |
1424 | * freezing the array as once all stripe_heads have been collected, | |
1425 | * no IO will be possible. Old stripe heads are freed once their | |
1426 | * pages have been transferred over, and the old kmem_cache is | |
1427 | * freed when all stripes are done. | |
1428 | * 3/ reallocate conf->disks to be suitable bigger. If this fails, | |
1429 | * we simple return a failre status - no need to clean anything up. | |
1430 | * 4/ allocate new pages for the new slots in the new stripe_heads. | |
1431 | * If this fails, we don't bother trying the shrink the | |
1432 | * stripe_heads down again, we just leave them as they are. | |
1433 | * As each stripe_head is processed the new one is released into | |
1434 | * active service. | |
1435 | * | |
1436 | * Once step2 is started, we cannot afford to wait for a write, | |
1437 | * so we use GFP_NOIO allocations. | |
1438 | */ | |
1439 | struct stripe_head *osh, *nsh; | |
1440 | LIST_HEAD(newstripes); | |
1441 | struct disk_info *ndisks; | |
d6f38f31 | 1442 | unsigned long cpu; |
b5470dc5 | 1443 | int err; |
e18b890b | 1444 | struct kmem_cache *sc; |
ad01c9e3 N |
1445 | int i; |
1446 | ||
1447 | if (newsize <= conf->pool_size) | |
1448 | return 0; /* never bother to shrink */ | |
1449 | ||
b5470dc5 DW |
1450 | err = md_allow_write(conf->mddev); |
1451 | if (err) | |
1452 | return err; | |
2a2275d6 | 1453 | |
ad01c9e3 N |
1454 | /* Step 1 */ |
1455 | sc = kmem_cache_create(conf->cache_name[1-conf->active_name], | |
1456 | sizeof(struct stripe_head)+(newsize-1)*sizeof(struct r5dev), | |
20c2df83 | 1457 | 0, 0, NULL); |
ad01c9e3 N |
1458 | if (!sc) |
1459 | return -ENOMEM; | |
1460 | ||
1461 | for (i = conf->max_nr_stripes; i; i--) { | |
6ce32846 | 1462 | nsh = kmem_cache_zalloc(sc, GFP_KERNEL); |
ad01c9e3 N |
1463 | if (!nsh) |
1464 | break; | |
1465 | ||
ad01c9e3 | 1466 | nsh->raid_conf = conf; |
417b8d4a DW |
1467 | #ifdef CONFIG_MULTICORE_RAID456 |
1468 | init_waitqueue_head(&nsh->ops.wait_for_ops); | |
1469 | #endif | |
ad01c9e3 N |
1470 | |
1471 | list_add(&nsh->lru, &newstripes); | |
1472 | } | |
1473 | if (i) { | |
1474 | /* didn't get enough, give up */ | |
1475 | while (!list_empty(&newstripes)) { | |
1476 | nsh = list_entry(newstripes.next, struct stripe_head, lru); | |
1477 | list_del(&nsh->lru); | |
1478 | kmem_cache_free(sc, nsh); | |
1479 | } | |
1480 | kmem_cache_destroy(sc); | |
1481 | return -ENOMEM; | |
1482 | } | |
1483 | /* Step 2 - Must use GFP_NOIO now. | |
1484 | * OK, we have enough stripes, start collecting inactive | |
1485 | * stripes and copying them over | |
1486 | */ | |
1487 | list_for_each_entry(nsh, &newstripes, lru) { | |
1488 | spin_lock_irq(&conf->device_lock); | |
1489 | wait_event_lock_irq(conf->wait_for_stripe, | |
1490 | !list_empty(&conf->inactive_list), | |
1491 | conf->device_lock, | |
482c0834 | 1492 | ); |
ad01c9e3 N |
1493 | osh = get_free_stripe(conf); |
1494 | spin_unlock_irq(&conf->device_lock); | |
1495 | atomic_set(&nsh->count, 1); | |
1496 | for(i=0; i<conf->pool_size; i++) | |
1497 | nsh->dev[i].page = osh->dev[i].page; | |
1498 | for( ; i<newsize; i++) | |
1499 | nsh->dev[i].page = NULL; | |
1500 | kmem_cache_free(conf->slab_cache, osh); | |
1501 | } | |
1502 | kmem_cache_destroy(conf->slab_cache); | |
1503 | ||
1504 | /* Step 3. | |
1505 | * At this point, we are holding all the stripes so the array | |
1506 | * is completely stalled, so now is a good time to resize | |
d6f38f31 | 1507 | * conf->disks and the scribble region |
ad01c9e3 N |
1508 | */ |
1509 | ndisks = kzalloc(newsize * sizeof(struct disk_info), GFP_NOIO); | |
1510 | if (ndisks) { | |
1511 | for (i=0; i<conf->raid_disks; i++) | |
1512 | ndisks[i] = conf->disks[i]; | |
1513 | kfree(conf->disks); | |
1514 | conf->disks = ndisks; | |
1515 | } else | |
1516 | err = -ENOMEM; | |
1517 | ||
d6f38f31 DW |
1518 | get_online_cpus(); |
1519 | conf->scribble_len = scribble_len(newsize); | |
1520 | for_each_present_cpu(cpu) { | |
1521 | struct raid5_percpu *percpu; | |
1522 | void *scribble; | |
1523 | ||
1524 | percpu = per_cpu_ptr(conf->percpu, cpu); | |
1525 | scribble = kmalloc(conf->scribble_len, GFP_NOIO); | |
1526 | ||
1527 | if (scribble) { | |
1528 | kfree(percpu->scribble); | |
1529 | percpu->scribble = scribble; | |
1530 | } else { | |
1531 | err = -ENOMEM; | |
1532 | break; | |
1533 | } | |
1534 | } | |
1535 | put_online_cpus(); | |
1536 | ||
ad01c9e3 N |
1537 | /* Step 4, return new stripes to service */ |
1538 | while(!list_empty(&newstripes)) { | |
1539 | nsh = list_entry(newstripes.next, struct stripe_head, lru); | |
1540 | list_del_init(&nsh->lru); | |
d6f38f31 | 1541 | |
ad01c9e3 N |
1542 | for (i=conf->raid_disks; i < newsize; i++) |
1543 | if (nsh->dev[i].page == NULL) { | |
1544 | struct page *p = alloc_page(GFP_NOIO); | |
1545 | nsh->dev[i].page = p; | |
1546 | if (!p) | |
1547 | err = -ENOMEM; | |
1548 | } | |
1549 | release_stripe(nsh); | |
1550 | } | |
1551 | /* critical section pass, GFP_NOIO no longer needed */ | |
1552 | ||
1553 | conf->slab_cache = sc; | |
1554 | conf->active_name = 1-conf->active_name; | |
1555 | conf->pool_size = newsize; | |
1556 | return err; | |
1557 | } | |
1da177e4 | 1558 | |
3f294f4f | 1559 | static int drop_one_stripe(raid5_conf_t *conf) |
1da177e4 LT |
1560 | { |
1561 | struct stripe_head *sh; | |
1562 | ||
3f294f4f N |
1563 | spin_lock_irq(&conf->device_lock); |
1564 | sh = get_free_stripe(conf); | |
1565 | spin_unlock_irq(&conf->device_lock); | |
1566 | if (!sh) | |
1567 | return 0; | |
78bafebd | 1568 | BUG_ON(atomic_read(&sh->count)); |
e4e11e38 | 1569 | shrink_buffers(sh); |
3f294f4f N |
1570 | kmem_cache_free(conf->slab_cache, sh); |
1571 | atomic_dec(&conf->active_stripes); | |
1572 | return 1; | |
1573 | } | |
1574 | ||
1575 | static void shrink_stripes(raid5_conf_t *conf) | |
1576 | { | |
1577 | while (drop_one_stripe(conf)) | |
1578 | ; | |
1579 | ||
29fc7e3e N |
1580 | if (conf->slab_cache) |
1581 | kmem_cache_destroy(conf->slab_cache); | |
1da177e4 LT |
1582 | conf->slab_cache = NULL; |
1583 | } | |
1584 | ||
6712ecf8 | 1585 | static void raid5_end_read_request(struct bio * bi, int error) |
1da177e4 | 1586 | { |
99c0fb5f | 1587 | struct stripe_head *sh = bi->bi_private; |
1da177e4 | 1588 | raid5_conf_t *conf = sh->raid_conf; |
7ecaa1e6 | 1589 | int disks = sh->disks, i; |
1da177e4 | 1590 | int uptodate = test_bit(BIO_UPTODATE, &bi->bi_flags); |
d6950432 N |
1591 | char b[BDEVNAME_SIZE]; |
1592 | mdk_rdev_t *rdev; | |
1da177e4 | 1593 | |
1da177e4 LT |
1594 | |
1595 | for (i=0 ; i<disks; i++) | |
1596 | if (bi == &sh->dev[i].req) | |
1597 | break; | |
1598 | ||
45b4233c DW |
1599 | pr_debug("end_read_request %llu/%d, count: %d, uptodate %d.\n", |
1600 | (unsigned long long)sh->sector, i, atomic_read(&sh->count), | |
1da177e4 LT |
1601 | uptodate); |
1602 | if (i == disks) { | |
1603 | BUG(); | |
6712ecf8 | 1604 | return; |
1da177e4 LT |
1605 | } |
1606 | ||
1607 | if (uptodate) { | |
1da177e4 | 1608 | set_bit(R5_UPTODATE, &sh->dev[i].flags); |
4e5314b5 | 1609 | if (test_bit(R5_ReadError, &sh->dev[i].flags)) { |
d6950432 | 1610 | rdev = conf->disks[i].rdev; |
8bda470e CD |
1611 | printk_ratelimited( |
1612 | KERN_INFO | |
1613 | "md/raid:%s: read error corrected" | |
1614 | " (%lu sectors at %llu on %s)\n", | |
1615 | mdname(conf->mddev), STRIPE_SECTORS, | |
1616 | (unsigned long long)(sh->sector | |
1617 | + rdev->data_offset), | |
1618 | bdevname(rdev->bdev, b)); | |
ddd5115f | 1619 | atomic_add(STRIPE_SECTORS, &rdev->corrected_errors); |
4e5314b5 N |
1620 | clear_bit(R5_ReadError, &sh->dev[i].flags); |
1621 | clear_bit(R5_ReWrite, &sh->dev[i].flags); | |
1622 | } | |
ba22dcbf N |
1623 | if (atomic_read(&conf->disks[i].rdev->read_errors)) |
1624 | atomic_set(&conf->disks[i].rdev->read_errors, 0); | |
1da177e4 | 1625 | } else { |
d6950432 | 1626 | const char *bdn = bdevname(conf->disks[i].rdev->bdev, b); |
ba22dcbf | 1627 | int retry = 0; |
d6950432 N |
1628 | rdev = conf->disks[i].rdev; |
1629 | ||
1da177e4 | 1630 | clear_bit(R5_UPTODATE, &sh->dev[i].flags); |
d6950432 | 1631 | atomic_inc(&rdev->read_errors); |
7b0bb536 | 1632 | if (conf->mddev->degraded >= conf->max_degraded) |
8bda470e CD |
1633 | printk_ratelimited( |
1634 | KERN_WARNING | |
1635 | "md/raid:%s: read error not correctable " | |
1636 | "(sector %llu on %s).\n", | |
1637 | mdname(conf->mddev), | |
1638 | (unsigned long long)(sh->sector | |
1639 | + rdev->data_offset), | |
1640 | bdn); | |
ba22dcbf | 1641 | else if (test_bit(R5_ReWrite, &sh->dev[i].flags)) |
4e5314b5 | 1642 | /* Oh, no!!! */ |
8bda470e CD |
1643 | printk_ratelimited( |
1644 | KERN_WARNING | |
1645 | "md/raid:%s: read error NOT corrected!! " | |
1646 | "(sector %llu on %s).\n", | |
1647 | mdname(conf->mddev), | |
1648 | (unsigned long long)(sh->sector | |
1649 | + rdev->data_offset), | |
1650 | bdn); | |
d6950432 | 1651 | else if (atomic_read(&rdev->read_errors) |
ba22dcbf | 1652 | > conf->max_nr_stripes) |
14f8d26b | 1653 | printk(KERN_WARNING |
0c55e022 | 1654 | "md/raid:%s: Too many read errors, failing device %s.\n", |
d6950432 | 1655 | mdname(conf->mddev), bdn); |
ba22dcbf N |
1656 | else |
1657 | retry = 1; | |
1658 | if (retry) | |
1659 | set_bit(R5_ReadError, &sh->dev[i].flags); | |
1660 | else { | |
4e5314b5 N |
1661 | clear_bit(R5_ReadError, &sh->dev[i].flags); |
1662 | clear_bit(R5_ReWrite, &sh->dev[i].flags); | |
d6950432 | 1663 | md_error(conf->mddev, rdev); |
ba22dcbf | 1664 | } |
1da177e4 LT |
1665 | } |
1666 | rdev_dec_pending(conf->disks[i].rdev, conf->mddev); | |
1da177e4 LT |
1667 | clear_bit(R5_LOCKED, &sh->dev[i].flags); |
1668 | set_bit(STRIPE_HANDLE, &sh->state); | |
1669 | release_stripe(sh); | |
1da177e4 LT |
1670 | } |
1671 | ||
d710e138 | 1672 | static void raid5_end_write_request(struct bio *bi, int error) |
1da177e4 | 1673 | { |
99c0fb5f | 1674 | struct stripe_head *sh = bi->bi_private; |
1da177e4 | 1675 | raid5_conf_t *conf = sh->raid_conf; |
7ecaa1e6 | 1676 | int disks = sh->disks, i; |
1da177e4 | 1677 | int uptodate = test_bit(BIO_UPTODATE, &bi->bi_flags); |
b84db560 N |
1678 | sector_t first_bad; |
1679 | int bad_sectors; | |
1da177e4 | 1680 | |
1da177e4 LT |
1681 | for (i=0 ; i<disks; i++) |
1682 | if (bi == &sh->dev[i].req) | |
1683 | break; | |
1684 | ||
45b4233c | 1685 | pr_debug("end_write_request %llu/%d, count %d, uptodate: %d.\n", |
1da177e4 LT |
1686 | (unsigned long long)sh->sector, i, atomic_read(&sh->count), |
1687 | uptodate); | |
1688 | if (i == disks) { | |
1689 | BUG(); | |
6712ecf8 | 1690 | return; |
1da177e4 LT |
1691 | } |
1692 | ||
bc2607f3 N |
1693 | if (!uptodate) { |
1694 | set_bit(WriteErrorSeen, &conf->disks[i].rdev->flags); | |
1695 | set_bit(R5_WriteError, &sh->dev[i].flags); | |
b84db560 N |
1696 | } else if (is_badblock(conf->disks[i].rdev, sh->sector, STRIPE_SECTORS, |
1697 | &first_bad, &bad_sectors)) | |
1698 | set_bit(R5_MadeGood, &sh->dev[i].flags); | |
1da177e4 LT |
1699 | |
1700 | rdev_dec_pending(conf->disks[i].rdev, conf->mddev); | |
1701 | ||
1702 | clear_bit(R5_LOCKED, &sh->dev[i].flags); | |
1703 | set_bit(STRIPE_HANDLE, &sh->state); | |
c04be0aa | 1704 | release_stripe(sh); |
1da177e4 LT |
1705 | } |
1706 | ||
1707 | ||
784052ec | 1708 | static sector_t compute_blocknr(struct stripe_head *sh, int i, int previous); |
1da177e4 | 1709 | |
784052ec | 1710 | static void raid5_build_block(struct stripe_head *sh, int i, int previous) |
1da177e4 LT |
1711 | { |
1712 | struct r5dev *dev = &sh->dev[i]; | |
1713 | ||
1714 | bio_init(&dev->req); | |
1715 | dev->req.bi_io_vec = &dev->vec; | |
1716 | dev->req.bi_vcnt++; | |
1717 | dev->req.bi_max_vecs++; | |
1718 | dev->vec.bv_page = dev->page; | |
1719 | dev->vec.bv_len = STRIPE_SIZE; | |
1720 | dev->vec.bv_offset = 0; | |
1721 | ||
1722 | dev->req.bi_sector = sh->sector; | |
1723 | dev->req.bi_private = sh; | |
1724 | ||
1725 | dev->flags = 0; | |
784052ec | 1726 | dev->sector = compute_blocknr(sh, i, previous); |
1da177e4 LT |
1727 | } |
1728 | ||
1729 | static void error(mddev_t *mddev, mdk_rdev_t *rdev) | |
1730 | { | |
1731 | char b[BDEVNAME_SIZE]; | |
7b92813c | 1732 | raid5_conf_t *conf = mddev->private; |
0c55e022 | 1733 | pr_debug("raid456: error called\n"); |
1da177e4 | 1734 | |
6f8d0c77 N |
1735 | if (test_and_clear_bit(In_sync, &rdev->flags)) { |
1736 | unsigned long flags; | |
1737 | spin_lock_irqsave(&conf->device_lock, flags); | |
1738 | mddev->degraded++; | |
1739 | spin_unlock_irqrestore(&conf->device_lock, flags); | |
1740 | /* | |
1741 | * if recovery was running, make sure it aborts. | |
1742 | */ | |
1743 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); | |
1da177e4 | 1744 | } |
de393cde | 1745 | set_bit(Blocked, &rdev->flags); |
6f8d0c77 N |
1746 | set_bit(Faulty, &rdev->flags); |
1747 | set_bit(MD_CHANGE_DEVS, &mddev->flags); | |
1748 | printk(KERN_ALERT | |
1749 | "md/raid:%s: Disk failure on %s, disabling device.\n" | |
1750 | "md/raid:%s: Operation continuing on %d devices.\n", | |
1751 | mdname(mddev), | |
1752 | bdevname(rdev->bdev, b), | |
1753 | mdname(mddev), | |
1754 | conf->raid_disks - mddev->degraded); | |
16a53ecc | 1755 | } |
1da177e4 LT |
1756 | |
1757 | /* | |
1758 | * Input: a 'big' sector number, | |
1759 | * Output: index of the data and parity disk, and the sector # in them. | |
1760 | */ | |
112bf897 | 1761 | static sector_t raid5_compute_sector(raid5_conf_t *conf, sector_t r_sector, |
911d4ee8 N |
1762 | int previous, int *dd_idx, |
1763 | struct stripe_head *sh) | |
1da177e4 | 1764 | { |
6e3b96ed | 1765 | sector_t stripe, stripe2; |
35f2a591 | 1766 | sector_t chunk_number; |
1da177e4 | 1767 | unsigned int chunk_offset; |
911d4ee8 | 1768 | int pd_idx, qd_idx; |
67cc2b81 | 1769 | int ddf_layout = 0; |
1da177e4 | 1770 | sector_t new_sector; |
e183eaed N |
1771 | int algorithm = previous ? conf->prev_algo |
1772 | : conf->algorithm; | |
09c9e5fa AN |
1773 | int sectors_per_chunk = previous ? conf->prev_chunk_sectors |
1774 | : conf->chunk_sectors; | |
112bf897 N |
1775 | int raid_disks = previous ? conf->previous_raid_disks |
1776 | : conf->raid_disks; | |
1777 | int data_disks = raid_disks - conf->max_degraded; | |
1da177e4 LT |
1778 | |
1779 | /* First compute the information on this sector */ | |
1780 | ||
1781 | /* | |
1782 | * Compute the chunk number and the sector offset inside the chunk | |
1783 | */ | |
1784 | chunk_offset = sector_div(r_sector, sectors_per_chunk); | |
1785 | chunk_number = r_sector; | |
1da177e4 LT |
1786 | |
1787 | /* | |
1788 | * Compute the stripe number | |
1789 | */ | |
35f2a591 N |
1790 | stripe = chunk_number; |
1791 | *dd_idx = sector_div(stripe, data_disks); | |
6e3b96ed | 1792 | stripe2 = stripe; |
1da177e4 LT |
1793 | /* |
1794 | * Select the parity disk based on the user selected algorithm. | |
1795 | */ | |
84789554 | 1796 | pd_idx = qd_idx = -1; |
16a53ecc N |
1797 | switch(conf->level) { |
1798 | case 4: | |
911d4ee8 | 1799 | pd_idx = data_disks; |
16a53ecc N |
1800 | break; |
1801 | case 5: | |
e183eaed | 1802 | switch (algorithm) { |
1da177e4 | 1803 | case ALGORITHM_LEFT_ASYMMETRIC: |
6e3b96ed | 1804 | pd_idx = data_disks - sector_div(stripe2, raid_disks); |
911d4ee8 | 1805 | if (*dd_idx >= pd_idx) |
1da177e4 LT |
1806 | (*dd_idx)++; |
1807 | break; | |
1808 | case ALGORITHM_RIGHT_ASYMMETRIC: | |
6e3b96ed | 1809 | pd_idx = sector_div(stripe2, raid_disks); |
911d4ee8 | 1810 | if (*dd_idx >= pd_idx) |
1da177e4 LT |
1811 | (*dd_idx)++; |
1812 | break; | |
1813 | case ALGORITHM_LEFT_SYMMETRIC: | |
6e3b96ed | 1814 | pd_idx = data_disks - sector_div(stripe2, raid_disks); |
911d4ee8 | 1815 | *dd_idx = (pd_idx + 1 + *dd_idx) % raid_disks; |
1da177e4 LT |
1816 | break; |
1817 | case ALGORITHM_RIGHT_SYMMETRIC: | |
6e3b96ed | 1818 | pd_idx = sector_div(stripe2, raid_disks); |
911d4ee8 | 1819 | *dd_idx = (pd_idx + 1 + *dd_idx) % raid_disks; |
1da177e4 | 1820 | break; |
99c0fb5f N |
1821 | case ALGORITHM_PARITY_0: |
1822 | pd_idx = 0; | |
1823 | (*dd_idx)++; | |
1824 | break; | |
1825 | case ALGORITHM_PARITY_N: | |
1826 | pd_idx = data_disks; | |
1827 | break; | |
1da177e4 | 1828 | default: |
99c0fb5f | 1829 | BUG(); |
16a53ecc N |
1830 | } |
1831 | break; | |
1832 | case 6: | |
1833 | ||
e183eaed | 1834 | switch (algorithm) { |
16a53ecc | 1835 | case ALGORITHM_LEFT_ASYMMETRIC: |
6e3b96ed | 1836 | pd_idx = raid_disks - 1 - sector_div(stripe2, raid_disks); |
911d4ee8 N |
1837 | qd_idx = pd_idx + 1; |
1838 | if (pd_idx == raid_disks-1) { | |
99c0fb5f | 1839 | (*dd_idx)++; /* Q D D D P */ |
911d4ee8 N |
1840 | qd_idx = 0; |
1841 | } else if (*dd_idx >= pd_idx) | |
16a53ecc N |
1842 | (*dd_idx) += 2; /* D D P Q D */ |
1843 | break; | |
1844 | case ALGORITHM_RIGHT_ASYMMETRIC: | |
6e3b96ed | 1845 | pd_idx = sector_div(stripe2, raid_disks); |
911d4ee8 N |
1846 | qd_idx = pd_idx + 1; |
1847 | if (pd_idx == raid_disks-1) { | |
99c0fb5f | 1848 | (*dd_idx)++; /* Q D D D P */ |
911d4ee8 N |
1849 | qd_idx = 0; |
1850 | } else if (*dd_idx >= pd_idx) | |
16a53ecc N |
1851 | (*dd_idx) += 2; /* D D P Q D */ |
1852 | break; | |
1853 | case ALGORITHM_LEFT_SYMMETRIC: | |
6e3b96ed | 1854 | pd_idx = raid_disks - 1 - sector_div(stripe2, raid_disks); |
911d4ee8 N |
1855 | qd_idx = (pd_idx + 1) % raid_disks; |
1856 | *dd_idx = (pd_idx + 2 + *dd_idx) % raid_disks; | |
16a53ecc N |
1857 | break; |
1858 | case ALGORITHM_RIGHT_SYMMETRIC: | |
6e3b96ed | 1859 | pd_idx = sector_div(stripe2, raid_disks); |
911d4ee8 N |
1860 | qd_idx = (pd_idx + 1) % raid_disks; |
1861 | *dd_idx = (pd_idx + 2 + *dd_idx) % raid_disks; | |
16a53ecc | 1862 | break; |
99c0fb5f N |
1863 | |
1864 | case ALGORITHM_PARITY_0: | |
1865 | pd_idx = 0; | |
1866 | qd_idx = 1; | |
1867 | (*dd_idx) += 2; | |
1868 | break; | |
1869 | case ALGORITHM_PARITY_N: | |
1870 | pd_idx = data_disks; | |
1871 | qd_idx = data_disks + 1; | |
1872 | break; | |
1873 | ||
1874 | case ALGORITHM_ROTATING_ZERO_RESTART: | |
1875 | /* Exactly the same as RIGHT_ASYMMETRIC, but or | |
1876 | * of blocks for computing Q is different. | |
1877 | */ | |
6e3b96ed | 1878 | pd_idx = sector_div(stripe2, raid_disks); |
99c0fb5f N |
1879 | qd_idx = pd_idx + 1; |
1880 | if (pd_idx == raid_disks-1) { | |
1881 | (*dd_idx)++; /* Q D D D P */ | |
1882 | qd_idx = 0; | |
1883 | } else if (*dd_idx >= pd_idx) | |
1884 | (*dd_idx) += 2; /* D D P Q D */ | |
67cc2b81 | 1885 | ddf_layout = 1; |
99c0fb5f N |
1886 | break; |
1887 | ||
1888 | case ALGORITHM_ROTATING_N_RESTART: | |
1889 | /* Same a left_asymmetric, by first stripe is | |
1890 | * D D D P Q rather than | |
1891 | * Q D D D P | |
1892 | */ | |
6e3b96ed N |
1893 | stripe2 += 1; |
1894 | pd_idx = raid_disks - 1 - sector_div(stripe2, raid_disks); | |
99c0fb5f N |
1895 | qd_idx = pd_idx + 1; |
1896 | if (pd_idx == raid_disks-1) { | |
1897 | (*dd_idx)++; /* Q D D D P */ | |
1898 | qd_idx = 0; | |
1899 | } else if (*dd_idx >= pd_idx) | |
1900 | (*dd_idx) += 2; /* D D P Q D */ | |
67cc2b81 | 1901 | ddf_layout = 1; |
99c0fb5f N |
1902 | break; |
1903 | ||
1904 | case ALGORITHM_ROTATING_N_CONTINUE: | |
1905 | /* Same as left_symmetric but Q is before P */ | |
6e3b96ed | 1906 | pd_idx = raid_disks - 1 - sector_div(stripe2, raid_disks); |
99c0fb5f N |
1907 | qd_idx = (pd_idx + raid_disks - 1) % raid_disks; |
1908 | *dd_idx = (pd_idx + 1 + *dd_idx) % raid_disks; | |
67cc2b81 | 1909 | ddf_layout = 1; |
99c0fb5f N |
1910 | break; |
1911 | ||
1912 | case ALGORITHM_LEFT_ASYMMETRIC_6: | |
1913 | /* RAID5 left_asymmetric, with Q on last device */ | |
6e3b96ed | 1914 | pd_idx = data_disks - sector_div(stripe2, raid_disks-1); |
99c0fb5f N |
1915 | if (*dd_idx >= pd_idx) |
1916 | (*dd_idx)++; | |
1917 | qd_idx = raid_disks - 1; | |
1918 | break; | |
1919 | ||
1920 | case ALGORITHM_RIGHT_ASYMMETRIC_6: | |
6e3b96ed | 1921 | pd_idx = sector_div(stripe2, raid_disks-1); |
99c0fb5f N |
1922 | if (*dd_idx >= pd_idx) |
1923 | (*dd_idx)++; | |
1924 | qd_idx = raid_disks - 1; | |
1925 | break; | |
1926 | ||
1927 | case ALGORITHM_LEFT_SYMMETRIC_6: | |
6e3b96ed | 1928 | pd_idx = data_disks - sector_div(stripe2, raid_disks-1); |
99c0fb5f N |
1929 | *dd_idx = (pd_idx + 1 + *dd_idx) % (raid_disks-1); |
1930 | qd_idx = raid_disks - 1; | |
1931 | break; | |
1932 | ||
1933 | case ALGORITHM_RIGHT_SYMMETRIC_6: | |
6e3b96ed | 1934 | pd_idx = sector_div(stripe2, raid_disks-1); |
99c0fb5f N |
1935 | *dd_idx = (pd_idx + 1 + *dd_idx) % (raid_disks-1); |
1936 | qd_idx = raid_disks - 1; | |
1937 | break; | |
1938 | ||
1939 | case ALGORITHM_PARITY_0_6: | |
1940 | pd_idx = 0; | |
1941 | (*dd_idx)++; | |
1942 | qd_idx = raid_disks - 1; | |
1943 | break; | |
1944 | ||
16a53ecc | 1945 | default: |
99c0fb5f | 1946 | BUG(); |
16a53ecc N |
1947 | } |
1948 | break; | |
1da177e4 LT |
1949 | } |
1950 | ||
911d4ee8 N |
1951 | if (sh) { |
1952 | sh->pd_idx = pd_idx; | |
1953 | sh->qd_idx = qd_idx; | |
67cc2b81 | 1954 | sh->ddf_layout = ddf_layout; |
911d4ee8 | 1955 | } |
1da177e4 LT |
1956 | /* |
1957 | * Finally, compute the new sector number | |
1958 | */ | |
1959 | new_sector = (sector_t)stripe * sectors_per_chunk + chunk_offset; | |
1960 | return new_sector; | |
1961 | } | |
1962 | ||
1963 | ||
784052ec | 1964 | static sector_t compute_blocknr(struct stripe_head *sh, int i, int previous) |
1da177e4 LT |
1965 | { |
1966 | raid5_conf_t *conf = sh->raid_conf; | |
b875e531 N |
1967 | int raid_disks = sh->disks; |
1968 | int data_disks = raid_disks - conf->max_degraded; | |
1da177e4 | 1969 | sector_t new_sector = sh->sector, check; |
09c9e5fa AN |
1970 | int sectors_per_chunk = previous ? conf->prev_chunk_sectors |
1971 | : conf->chunk_sectors; | |
e183eaed N |
1972 | int algorithm = previous ? conf->prev_algo |
1973 | : conf->algorithm; | |
1da177e4 LT |
1974 | sector_t stripe; |
1975 | int chunk_offset; | |
35f2a591 N |
1976 | sector_t chunk_number; |
1977 | int dummy1, dd_idx = i; | |
1da177e4 | 1978 | sector_t r_sector; |
911d4ee8 | 1979 | struct stripe_head sh2; |
1da177e4 | 1980 | |
16a53ecc | 1981 | |
1da177e4 LT |
1982 | chunk_offset = sector_div(new_sector, sectors_per_chunk); |
1983 | stripe = new_sector; | |
1da177e4 | 1984 | |
16a53ecc N |
1985 | if (i == sh->pd_idx) |
1986 | return 0; | |
1987 | switch(conf->level) { | |
1988 | case 4: break; | |
1989 | case 5: | |
e183eaed | 1990 | switch (algorithm) { |
1da177e4 LT |
1991 | case ALGORITHM_LEFT_ASYMMETRIC: |
1992 | case ALGORITHM_RIGHT_ASYMMETRIC: | |
1993 | if (i > sh->pd_idx) | |
1994 | i--; | |
1995 | break; | |
1996 | case ALGORITHM_LEFT_SYMMETRIC: | |
1997 | case ALGORITHM_RIGHT_SYMMETRIC: | |
1998 | if (i < sh->pd_idx) | |
1999 | i += raid_disks; | |
2000 | i -= (sh->pd_idx + 1); | |
2001 | break; | |
99c0fb5f N |
2002 | case ALGORITHM_PARITY_0: |
2003 | i -= 1; | |
2004 | break; | |
2005 | case ALGORITHM_PARITY_N: | |
2006 | break; | |
1da177e4 | 2007 | default: |
99c0fb5f | 2008 | BUG(); |
16a53ecc N |
2009 | } |
2010 | break; | |
2011 | case 6: | |
d0dabf7e | 2012 | if (i == sh->qd_idx) |
16a53ecc | 2013 | return 0; /* It is the Q disk */ |
e183eaed | 2014 | switch (algorithm) { |
16a53ecc N |
2015 | case ALGORITHM_LEFT_ASYMMETRIC: |
2016 | case ALGORITHM_RIGHT_ASYMMETRIC: | |
99c0fb5f N |
2017 | case ALGORITHM_ROTATING_ZERO_RESTART: |
2018 | case ALGORITHM_ROTATING_N_RESTART: | |
2019 | if (sh->pd_idx == raid_disks-1) | |
2020 | i--; /* Q D D D P */ | |
16a53ecc N |
2021 | else if (i > sh->pd_idx) |
2022 | i -= 2; /* D D P Q D */ | |
2023 | break; | |
2024 | case ALGORITHM_LEFT_SYMMETRIC: | |
2025 | case ALGORITHM_RIGHT_SYMMETRIC: | |
2026 | if (sh->pd_idx == raid_disks-1) | |
2027 | i--; /* Q D D D P */ | |
2028 | else { | |
2029 | /* D D P Q D */ | |
2030 | if (i < sh->pd_idx) | |
2031 | i += raid_disks; | |
2032 | i -= (sh->pd_idx + 2); | |
2033 | } | |
2034 | break; | |
99c0fb5f N |
2035 | case ALGORITHM_PARITY_0: |
2036 | i -= 2; | |
2037 | break; | |
2038 | case ALGORITHM_PARITY_N: | |
2039 | break; | |
2040 | case ALGORITHM_ROTATING_N_CONTINUE: | |
e4424fee | 2041 | /* Like left_symmetric, but P is before Q */ |
99c0fb5f N |
2042 | if (sh->pd_idx == 0) |
2043 | i--; /* P D D D Q */ | |
e4424fee N |
2044 | else { |
2045 | /* D D Q P D */ | |
2046 | if (i < sh->pd_idx) | |
2047 | i += raid_disks; | |
2048 | i -= (sh->pd_idx + 1); | |
2049 | } | |
99c0fb5f N |
2050 | break; |
2051 | case ALGORITHM_LEFT_ASYMMETRIC_6: | |
2052 | case ALGORITHM_RIGHT_ASYMMETRIC_6: | |
2053 | if (i > sh->pd_idx) | |
2054 | i--; | |
2055 | break; | |
2056 | case ALGORITHM_LEFT_SYMMETRIC_6: | |
2057 | case ALGORITHM_RIGHT_SYMMETRIC_6: | |
2058 | if (i < sh->pd_idx) | |
2059 | i += data_disks + 1; | |
2060 | i -= (sh->pd_idx + 1); | |
2061 | break; | |
2062 | case ALGORITHM_PARITY_0_6: | |
2063 | i -= 1; | |
2064 | break; | |
16a53ecc | 2065 | default: |
99c0fb5f | 2066 | BUG(); |
16a53ecc N |
2067 | } |
2068 | break; | |
1da177e4 LT |
2069 | } |
2070 | ||
2071 | chunk_number = stripe * data_disks + i; | |
35f2a591 | 2072 | r_sector = chunk_number * sectors_per_chunk + chunk_offset; |
1da177e4 | 2073 | |
112bf897 | 2074 | check = raid5_compute_sector(conf, r_sector, |
784052ec | 2075 | previous, &dummy1, &sh2); |
911d4ee8 N |
2076 | if (check != sh->sector || dummy1 != dd_idx || sh2.pd_idx != sh->pd_idx |
2077 | || sh2.qd_idx != sh->qd_idx) { | |
0c55e022 N |
2078 | printk(KERN_ERR "md/raid:%s: compute_blocknr: map not correct\n", |
2079 | mdname(conf->mddev)); | |
1da177e4 LT |
2080 | return 0; |
2081 | } | |
2082 | return r_sector; | |
2083 | } | |
2084 | ||
2085 | ||
600aa109 | 2086 | static void |
c0f7bddb | 2087 | schedule_reconstruction(struct stripe_head *sh, struct stripe_head_state *s, |
600aa109 | 2088 | int rcw, int expand) |
e33129d8 DW |
2089 | { |
2090 | int i, pd_idx = sh->pd_idx, disks = sh->disks; | |
c0f7bddb YT |
2091 | raid5_conf_t *conf = sh->raid_conf; |
2092 | int level = conf->level; | |
e33129d8 DW |
2093 | |
2094 | if (rcw) { | |
2095 | /* if we are not expanding this is a proper write request, and | |
2096 | * there will be bios with new data to be drained into the | |
2097 | * stripe cache | |
2098 | */ | |
2099 | if (!expand) { | |
600aa109 DW |
2100 | sh->reconstruct_state = reconstruct_state_drain_run; |
2101 | set_bit(STRIPE_OP_BIODRAIN, &s->ops_request); | |
2102 | } else | |
2103 | sh->reconstruct_state = reconstruct_state_run; | |
16a53ecc | 2104 | |
ac6b53b6 | 2105 | set_bit(STRIPE_OP_RECONSTRUCT, &s->ops_request); |
e33129d8 DW |
2106 | |
2107 | for (i = disks; i--; ) { | |
2108 | struct r5dev *dev = &sh->dev[i]; | |
2109 | ||
2110 | if (dev->towrite) { | |
2111 | set_bit(R5_LOCKED, &dev->flags); | |
d8ee0728 | 2112 | set_bit(R5_Wantdrain, &dev->flags); |
e33129d8 DW |
2113 | if (!expand) |
2114 | clear_bit(R5_UPTODATE, &dev->flags); | |
600aa109 | 2115 | s->locked++; |
e33129d8 DW |
2116 | } |
2117 | } | |
c0f7bddb | 2118 | if (s->locked + conf->max_degraded == disks) |
8b3e6cdc | 2119 | if (!test_and_set_bit(STRIPE_FULL_WRITE, &sh->state)) |
c0f7bddb | 2120 | atomic_inc(&conf->pending_full_writes); |
e33129d8 | 2121 | } else { |
c0f7bddb | 2122 | BUG_ON(level == 6); |
e33129d8 DW |
2123 | BUG_ON(!(test_bit(R5_UPTODATE, &sh->dev[pd_idx].flags) || |
2124 | test_bit(R5_Wantcompute, &sh->dev[pd_idx].flags))); | |
2125 | ||
d8ee0728 | 2126 | sh->reconstruct_state = reconstruct_state_prexor_drain_run; |
600aa109 DW |
2127 | set_bit(STRIPE_OP_PREXOR, &s->ops_request); |
2128 | set_bit(STRIPE_OP_BIODRAIN, &s->ops_request); | |
ac6b53b6 | 2129 | set_bit(STRIPE_OP_RECONSTRUCT, &s->ops_request); |
e33129d8 DW |
2130 | |
2131 | for (i = disks; i--; ) { | |
2132 | struct r5dev *dev = &sh->dev[i]; | |
2133 | if (i == pd_idx) | |
2134 | continue; | |
2135 | ||
e33129d8 DW |
2136 | if (dev->towrite && |
2137 | (test_bit(R5_UPTODATE, &dev->flags) || | |
d8ee0728 DW |
2138 | test_bit(R5_Wantcompute, &dev->flags))) { |
2139 | set_bit(R5_Wantdrain, &dev->flags); | |
e33129d8 DW |
2140 | set_bit(R5_LOCKED, &dev->flags); |
2141 | clear_bit(R5_UPTODATE, &dev->flags); | |
600aa109 | 2142 | s->locked++; |
e33129d8 DW |
2143 | } |
2144 | } | |
2145 | } | |
2146 | ||
c0f7bddb | 2147 | /* keep the parity disk(s) locked while asynchronous operations |
e33129d8 DW |
2148 | * are in flight |
2149 | */ | |
2150 | set_bit(R5_LOCKED, &sh->dev[pd_idx].flags); | |
2151 | clear_bit(R5_UPTODATE, &sh->dev[pd_idx].flags); | |
600aa109 | 2152 | s->locked++; |
e33129d8 | 2153 | |
c0f7bddb YT |
2154 | if (level == 6) { |
2155 | int qd_idx = sh->qd_idx; | |
2156 | struct r5dev *dev = &sh->dev[qd_idx]; | |
2157 | ||
2158 | set_bit(R5_LOCKED, &dev->flags); | |
2159 | clear_bit(R5_UPTODATE, &dev->flags); | |
2160 | s->locked++; | |
2161 | } | |
2162 | ||
600aa109 | 2163 | pr_debug("%s: stripe %llu locked: %d ops_request: %lx\n", |
e46b272b | 2164 | __func__, (unsigned long long)sh->sector, |
600aa109 | 2165 | s->locked, s->ops_request); |
e33129d8 | 2166 | } |
16a53ecc | 2167 | |
1da177e4 LT |
2168 | /* |
2169 | * Each stripe/dev can have one or more bion attached. | |
16a53ecc | 2170 | * toread/towrite point to the first in a chain. |
1da177e4 LT |
2171 | * The bi_next chain must be in order. |
2172 | */ | |
2173 | static int add_stripe_bio(struct stripe_head *sh, struct bio *bi, int dd_idx, int forwrite) | |
2174 | { | |
2175 | struct bio **bip; | |
2176 | raid5_conf_t *conf = sh->raid_conf; | |
72626685 | 2177 | int firstwrite=0; |
1da177e4 | 2178 | |
cbe47ec5 | 2179 | pr_debug("adding bi b#%llu to stripe s#%llu\n", |
1da177e4 LT |
2180 | (unsigned long long)bi->bi_sector, |
2181 | (unsigned long long)sh->sector); | |
2182 | ||
2183 | ||
1da177e4 | 2184 | spin_lock_irq(&conf->device_lock); |
72626685 | 2185 | if (forwrite) { |
1da177e4 | 2186 | bip = &sh->dev[dd_idx].towrite; |
72626685 N |
2187 | if (*bip == NULL && sh->dev[dd_idx].written == NULL) |
2188 | firstwrite = 1; | |
2189 | } else | |
1da177e4 LT |
2190 | bip = &sh->dev[dd_idx].toread; |
2191 | while (*bip && (*bip)->bi_sector < bi->bi_sector) { | |
2192 | if ((*bip)->bi_sector + ((*bip)->bi_size >> 9) > bi->bi_sector) | |
2193 | goto overlap; | |
2194 | bip = & (*bip)->bi_next; | |
2195 | } | |
2196 | if (*bip && (*bip)->bi_sector < bi->bi_sector + ((bi->bi_size)>>9)) | |
2197 | goto overlap; | |
2198 | ||
78bafebd | 2199 | BUG_ON(*bip && bi->bi_next && (*bip) != bi->bi_next); |
1da177e4 LT |
2200 | if (*bip) |
2201 | bi->bi_next = *bip; | |
2202 | *bip = bi; | |
960e739d | 2203 | bi->bi_phys_segments++; |
72626685 | 2204 | |
1da177e4 LT |
2205 | if (forwrite) { |
2206 | /* check if page is covered */ | |
2207 | sector_t sector = sh->dev[dd_idx].sector; | |
2208 | for (bi=sh->dev[dd_idx].towrite; | |
2209 | sector < sh->dev[dd_idx].sector + STRIPE_SECTORS && | |
2210 | bi && bi->bi_sector <= sector; | |
2211 | bi = r5_next_bio(bi, sh->dev[dd_idx].sector)) { | |
2212 | if (bi->bi_sector + (bi->bi_size>>9) >= sector) | |
2213 | sector = bi->bi_sector + (bi->bi_size>>9); | |
2214 | } | |
2215 | if (sector >= sh->dev[dd_idx].sector + STRIPE_SECTORS) | |
2216 | set_bit(R5_OVERWRITE, &sh->dev[dd_idx].flags); | |
2217 | } | |
cbe47ec5 | 2218 | spin_unlock_irq(&conf->device_lock); |
cbe47ec5 N |
2219 | |
2220 | pr_debug("added bi b#%llu to stripe s#%llu, disk %d.\n", | |
2221 | (unsigned long long)(*bip)->bi_sector, | |
2222 | (unsigned long long)sh->sector, dd_idx); | |
2223 | ||
2224 | if (conf->mddev->bitmap && firstwrite) { | |
2225 | bitmap_startwrite(conf->mddev->bitmap, sh->sector, | |
2226 | STRIPE_SECTORS, 0); | |
2227 | sh->bm_seq = conf->seq_flush+1; | |
2228 | set_bit(STRIPE_BIT_DELAY, &sh->state); | |
2229 | } | |
1da177e4 LT |
2230 | return 1; |
2231 | ||
2232 | overlap: | |
2233 | set_bit(R5_Overlap, &sh->dev[dd_idx].flags); | |
2234 | spin_unlock_irq(&conf->device_lock); | |
1da177e4 LT |
2235 | return 0; |
2236 | } | |
2237 | ||
29269553 N |
2238 | static void end_reshape(raid5_conf_t *conf); |
2239 | ||
911d4ee8 N |
2240 | static void stripe_set_idx(sector_t stripe, raid5_conf_t *conf, int previous, |
2241 | struct stripe_head *sh) | |
ccfcc3c1 | 2242 | { |
784052ec | 2243 | int sectors_per_chunk = |
09c9e5fa | 2244 | previous ? conf->prev_chunk_sectors : conf->chunk_sectors; |
911d4ee8 | 2245 | int dd_idx; |
2d2063ce | 2246 | int chunk_offset = sector_div(stripe, sectors_per_chunk); |
112bf897 | 2247 | int disks = previous ? conf->previous_raid_disks : conf->raid_disks; |
2d2063ce | 2248 | |
112bf897 N |
2249 | raid5_compute_sector(conf, |
2250 | stripe * (disks - conf->max_degraded) | |
b875e531 | 2251 | *sectors_per_chunk + chunk_offset, |
112bf897 | 2252 | previous, |
911d4ee8 | 2253 | &dd_idx, sh); |
ccfcc3c1 N |
2254 | } |
2255 | ||
a4456856 | 2256 | static void |
1fe797e6 | 2257 | handle_failed_stripe(raid5_conf_t *conf, struct stripe_head *sh, |
a4456856 DW |
2258 | struct stripe_head_state *s, int disks, |
2259 | struct bio **return_bi) | |
2260 | { | |
2261 | int i; | |
2262 | for (i = disks; i--; ) { | |
2263 | struct bio *bi; | |
2264 | int bitmap_end = 0; | |
2265 | ||
2266 | if (test_bit(R5_ReadError, &sh->dev[i].flags)) { | |
2267 | mdk_rdev_t *rdev; | |
2268 | rcu_read_lock(); | |
2269 | rdev = rcu_dereference(conf->disks[i].rdev); | |
2270 | if (rdev && test_bit(In_sync, &rdev->flags)) | |
7f0da59b N |
2271 | atomic_inc(&rdev->nr_pending); |
2272 | else | |
2273 | rdev = NULL; | |
a4456856 | 2274 | rcu_read_unlock(); |
7f0da59b N |
2275 | if (rdev) { |
2276 | if (!rdev_set_badblocks( | |
2277 | rdev, | |
2278 | sh->sector, | |
2279 | STRIPE_SECTORS, 0)) | |
2280 | md_error(conf->mddev, rdev); | |
2281 | rdev_dec_pending(rdev, conf->mddev); | |
2282 | } | |
a4456856 DW |
2283 | } |
2284 | spin_lock_irq(&conf->device_lock); | |
2285 | /* fail all writes first */ | |
2286 | bi = sh->dev[i].towrite; | |
2287 | sh->dev[i].towrite = NULL; | |
2288 | if (bi) { | |
2289 | s->to_write--; | |
2290 | bitmap_end = 1; | |
2291 | } | |
2292 | ||
2293 | if (test_and_clear_bit(R5_Overlap, &sh->dev[i].flags)) | |
2294 | wake_up(&conf->wait_for_overlap); | |
2295 | ||
2296 | while (bi && bi->bi_sector < | |
2297 | sh->dev[i].sector + STRIPE_SECTORS) { | |
2298 | struct bio *nextbi = r5_next_bio(bi, sh->dev[i].sector); | |
2299 | clear_bit(BIO_UPTODATE, &bi->bi_flags); | |
960e739d | 2300 | if (!raid5_dec_bi_phys_segments(bi)) { |
a4456856 DW |
2301 | md_write_end(conf->mddev); |
2302 | bi->bi_next = *return_bi; | |
2303 | *return_bi = bi; | |
2304 | } | |
2305 | bi = nextbi; | |
2306 | } | |
2307 | /* and fail all 'written' */ | |
2308 | bi = sh->dev[i].written; | |
2309 | sh->dev[i].written = NULL; | |
2310 | if (bi) bitmap_end = 1; | |
2311 | while (bi && bi->bi_sector < | |
2312 | sh->dev[i].sector + STRIPE_SECTORS) { | |
2313 | struct bio *bi2 = r5_next_bio(bi, sh->dev[i].sector); | |
2314 | clear_bit(BIO_UPTODATE, &bi->bi_flags); | |
960e739d | 2315 | if (!raid5_dec_bi_phys_segments(bi)) { |
a4456856 DW |
2316 | md_write_end(conf->mddev); |
2317 | bi->bi_next = *return_bi; | |
2318 | *return_bi = bi; | |
2319 | } | |
2320 | bi = bi2; | |
2321 | } | |
2322 | ||
b5e98d65 DW |
2323 | /* fail any reads if this device is non-operational and |
2324 | * the data has not reached the cache yet. | |
2325 | */ | |
2326 | if (!test_bit(R5_Wantfill, &sh->dev[i].flags) && | |
2327 | (!test_bit(R5_Insync, &sh->dev[i].flags) || | |
2328 | test_bit(R5_ReadError, &sh->dev[i].flags))) { | |
a4456856 DW |
2329 | bi = sh->dev[i].toread; |
2330 | sh->dev[i].toread = NULL; | |
2331 | if (test_and_clear_bit(R5_Overlap, &sh->dev[i].flags)) | |
2332 | wake_up(&conf->wait_for_overlap); | |
2333 | if (bi) s->to_read--; | |
2334 | while (bi && bi->bi_sector < | |
2335 | sh->dev[i].sector + STRIPE_SECTORS) { | |
2336 | struct bio *nextbi = | |
2337 | r5_next_bio(bi, sh->dev[i].sector); | |
2338 | clear_bit(BIO_UPTODATE, &bi->bi_flags); | |
960e739d | 2339 | if (!raid5_dec_bi_phys_segments(bi)) { |
a4456856 DW |
2340 | bi->bi_next = *return_bi; |
2341 | *return_bi = bi; | |
2342 | } | |
2343 | bi = nextbi; | |
2344 | } | |
2345 | } | |
2346 | spin_unlock_irq(&conf->device_lock); | |
2347 | if (bitmap_end) | |
2348 | bitmap_endwrite(conf->mddev->bitmap, sh->sector, | |
2349 | STRIPE_SECTORS, 0, 0); | |
8cfa7b0f N |
2350 | /* If we were in the middle of a write the parity block might |
2351 | * still be locked - so just clear all R5_LOCKED flags | |
2352 | */ | |
2353 | clear_bit(R5_LOCKED, &sh->dev[i].flags); | |
a4456856 DW |
2354 | } |
2355 | ||
8b3e6cdc DW |
2356 | if (test_and_clear_bit(STRIPE_FULL_WRITE, &sh->state)) |
2357 | if (atomic_dec_and_test(&conf->pending_full_writes)) | |
2358 | md_wakeup_thread(conf->mddev->thread); | |
a4456856 DW |
2359 | } |
2360 | ||
7f0da59b N |
2361 | static void |
2362 | handle_failed_sync(raid5_conf_t *conf, struct stripe_head *sh, | |
2363 | struct stripe_head_state *s) | |
2364 | { | |
2365 | int abort = 0; | |
2366 | int i; | |
2367 | ||
2368 | md_done_sync(conf->mddev, STRIPE_SECTORS, 0); | |
2369 | clear_bit(STRIPE_SYNCING, &sh->state); | |
2370 | s->syncing = 0; | |
2371 | /* There is nothing more to do for sync/check/repair. | |
2372 | * For recover we need to record a bad block on all | |
2373 | * non-sync devices, or abort the recovery | |
2374 | */ | |
2375 | if (!test_bit(MD_RECOVERY_RECOVER, &conf->mddev->recovery)) | |
2376 | return; | |
2377 | /* During recovery devices cannot be removed, so locking and | |
2378 | * refcounting of rdevs is not needed | |
2379 | */ | |
2380 | for (i = 0; i < conf->raid_disks; i++) { | |
2381 | mdk_rdev_t *rdev = conf->disks[i].rdev; | |
2382 | if (!rdev | |
2383 | || test_bit(Faulty, &rdev->flags) | |
2384 | || test_bit(In_sync, &rdev->flags)) | |
2385 | continue; | |
2386 | if (!rdev_set_badblocks(rdev, sh->sector, | |
2387 | STRIPE_SECTORS, 0)) | |
2388 | abort = 1; | |
2389 | } | |
2390 | if (abort) { | |
2391 | conf->recovery_disabled = conf->mddev->recovery_disabled; | |
2392 | set_bit(MD_RECOVERY_INTR, &conf->mddev->recovery); | |
2393 | } | |
2394 | } | |
2395 | ||
93b3dbce | 2396 | /* fetch_block - checks the given member device to see if its data needs |
1fe797e6 DW |
2397 | * to be read or computed to satisfy a request. |
2398 | * | |
2399 | * Returns 1 when no more member devices need to be checked, otherwise returns | |
93b3dbce | 2400 | * 0 to tell the loop in handle_stripe_fill to continue |
f38e1219 | 2401 | */ |
93b3dbce N |
2402 | static int fetch_block(struct stripe_head *sh, struct stripe_head_state *s, |
2403 | int disk_idx, int disks) | |
a4456856 | 2404 | { |
5599becc | 2405 | struct r5dev *dev = &sh->dev[disk_idx]; |
f2b3b44d N |
2406 | struct r5dev *fdev[2] = { &sh->dev[s->failed_num[0]], |
2407 | &sh->dev[s->failed_num[1]] }; | |
5599becc | 2408 | |
93b3dbce | 2409 | /* is the data in this block needed, and can we get it? */ |
5599becc YT |
2410 | if (!test_bit(R5_LOCKED, &dev->flags) && |
2411 | !test_bit(R5_UPTODATE, &dev->flags) && | |
2412 | (dev->toread || | |
2413 | (dev->towrite && !test_bit(R5_OVERWRITE, &dev->flags)) || | |
2414 | s->syncing || s->expanding || | |
5d35e09c N |
2415 | (s->failed >= 1 && fdev[0]->toread) || |
2416 | (s->failed >= 2 && fdev[1]->toread) || | |
93b3dbce N |
2417 | (sh->raid_conf->level <= 5 && s->failed && fdev[0]->towrite && |
2418 | !test_bit(R5_OVERWRITE, &fdev[0]->flags)) || | |
2419 | (sh->raid_conf->level == 6 && s->failed && s->to_write))) { | |
5599becc YT |
2420 | /* we would like to get this block, possibly by computing it, |
2421 | * otherwise read it if the backing disk is insync | |
2422 | */ | |
2423 | BUG_ON(test_bit(R5_Wantcompute, &dev->flags)); | |
2424 | BUG_ON(test_bit(R5_Wantread, &dev->flags)); | |
2425 | if ((s->uptodate == disks - 1) && | |
f2b3b44d N |
2426 | (s->failed && (disk_idx == s->failed_num[0] || |
2427 | disk_idx == s->failed_num[1]))) { | |
5599becc YT |
2428 | /* have disk failed, and we're requested to fetch it; |
2429 | * do compute it | |
a4456856 | 2430 | */ |
5599becc YT |
2431 | pr_debug("Computing stripe %llu block %d\n", |
2432 | (unsigned long long)sh->sector, disk_idx); | |
2433 | set_bit(STRIPE_COMPUTE_RUN, &sh->state); | |
2434 | set_bit(STRIPE_OP_COMPUTE_BLK, &s->ops_request); | |
2435 | set_bit(R5_Wantcompute, &dev->flags); | |
2436 | sh->ops.target = disk_idx; | |
2437 | sh->ops.target2 = -1; /* no 2nd target */ | |
2438 | s->req_compute = 1; | |
93b3dbce N |
2439 | /* Careful: from this point on 'uptodate' is in the eye |
2440 | * of raid_run_ops which services 'compute' operations | |
2441 | * before writes. R5_Wantcompute flags a block that will | |
2442 | * be R5_UPTODATE by the time it is needed for a | |
2443 | * subsequent operation. | |
2444 | */ | |
5599becc YT |
2445 | s->uptodate++; |
2446 | return 1; | |
2447 | } else if (s->uptodate == disks-2 && s->failed >= 2) { | |
2448 | /* Computing 2-failure is *very* expensive; only | |
2449 | * do it if failed >= 2 | |
2450 | */ | |
2451 | int other; | |
2452 | for (other = disks; other--; ) { | |
2453 | if (other == disk_idx) | |
2454 | continue; | |
2455 | if (!test_bit(R5_UPTODATE, | |
2456 | &sh->dev[other].flags)) | |
2457 | break; | |
a4456856 | 2458 | } |
5599becc YT |
2459 | BUG_ON(other < 0); |
2460 | pr_debug("Computing stripe %llu blocks %d,%d\n", | |
2461 | (unsigned long long)sh->sector, | |
2462 | disk_idx, other); | |
2463 | set_bit(STRIPE_COMPUTE_RUN, &sh->state); | |
2464 | set_bit(STRIPE_OP_COMPUTE_BLK, &s->ops_request); | |
2465 | set_bit(R5_Wantcompute, &sh->dev[disk_idx].flags); | |
2466 | set_bit(R5_Wantcompute, &sh->dev[other].flags); | |
2467 | sh->ops.target = disk_idx; | |
2468 | sh->ops.target2 = other; | |
2469 | s->uptodate += 2; | |
2470 | s->req_compute = 1; | |
2471 | return 1; | |
2472 | } else if (test_bit(R5_Insync, &dev->flags)) { | |
2473 | set_bit(R5_LOCKED, &dev->flags); | |
2474 | set_bit(R5_Wantread, &dev->flags); | |
2475 | s->locked++; | |
2476 | pr_debug("Reading block %d (sync=%d)\n", | |
2477 | disk_idx, s->syncing); | |
a4456856 DW |
2478 | } |
2479 | } | |
5599becc YT |
2480 | |
2481 | return 0; | |
2482 | } | |
2483 | ||
2484 | /** | |
93b3dbce | 2485 | * handle_stripe_fill - read or compute data to satisfy pending requests. |
5599becc | 2486 | */ |
93b3dbce N |
2487 | static void handle_stripe_fill(struct stripe_head *sh, |
2488 | struct stripe_head_state *s, | |
2489 | int disks) | |
5599becc YT |
2490 | { |
2491 | int i; | |
2492 | ||
2493 | /* look for blocks to read/compute, skip this if a compute | |
2494 | * is already in flight, or if the stripe contents are in the | |
2495 | * midst of changing due to a write | |
2496 | */ | |
2497 | if (!test_bit(STRIPE_COMPUTE_RUN, &sh->state) && !sh->check_state && | |
2498 | !sh->reconstruct_state) | |
2499 | for (i = disks; i--; ) | |
93b3dbce | 2500 | if (fetch_block(sh, s, i, disks)) |
5599becc | 2501 | break; |
a4456856 DW |
2502 | set_bit(STRIPE_HANDLE, &sh->state); |
2503 | } | |
2504 | ||
2505 | ||
1fe797e6 | 2506 | /* handle_stripe_clean_event |
a4456856 DW |
2507 | * any written block on an uptodate or failed drive can be returned. |
2508 | * Note that if we 'wrote' to a failed drive, it will be UPTODATE, but | |
2509 | * never LOCKED, so we don't need to test 'failed' directly. | |
2510 | */ | |
1fe797e6 | 2511 | static void handle_stripe_clean_event(raid5_conf_t *conf, |
a4456856 DW |
2512 | struct stripe_head *sh, int disks, struct bio **return_bi) |
2513 | { | |
2514 | int i; | |
2515 | struct r5dev *dev; | |
2516 | ||
2517 | for (i = disks; i--; ) | |
2518 | if (sh->dev[i].written) { | |
2519 | dev = &sh->dev[i]; | |
2520 | if (!test_bit(R5_LOCKED, &dev->flags) && | |
2521 | test_bit(R5_UPTODATE, &dev->flags)) { | |
2522 | /* We can return any write requests */ | |
2523 | struct bio *wbi, *wbi2; | |
2524 | int bitmap_end = 0; | |
45b4233c | 2525 | pr_debug("Return write for disc %d\n", i); |
a4456856 DW |
2526 | spin_lock_irq(&conf->device_lock); |
2527 | wbi = dev->written; | |
2528 | dev->written = NULL; | |
2529 | while (wbi && wbi->bi_sector < | |
2530 | dev->sector + STRIPE_SECTORS) { | |
2531 | wbi2 = r5_next_bio(wbi, dev->sector); | |
960e739d | 2532 | if (!raid5_dec_bi_phys_segments(wbi)) { |
a4456856 DW |
2533 | md_write_end(conf->mddev); |
2534 | wbi->bi_next = *return_bi; | |
2535 | *return_bi = wbi; | |
2536 | } | |
2537 | wbi = wbi2; | |
2538 | } | |
2539 | if (dev->towrite == NULL) | |
2540 | bitmap_end = 1; | |
2541 | spin_unlock_irq(&conf->device_lock); | |
2542 | if (bitmap_end) | |
2543 | bitmap_endwrite(conf->mddev->bitmap, | |
2544 | sh->sector, | |
2545 | STRIPE_SECTORS, | |
2546 | !test_bit(STRIPE_DEGRADED, &sh->state), | |
2547 | 0); | |
2548 | } | |
2549 | } | |
8b3e6cdc DW |
2550 | |
2551 | if (test_and_clear_bit(STRIPE_FULL_WRITE, &sh->state)) | |
2552 | if (atomic_dec_and_test(&conf->pending_full_writes)) | |
2553 | md_wakeup_thread(conf->mddev->thread); | |
a4456856 DW |
2554 | } |
2555 | ||
c8ac1803 N |
2556 | static void handle_stripe_dirtying(raid5_conf_t *conf, |
2557 | struct stripe_head *sh, | |
2558 | struct stripe_head_state *s, | |
2559 | int disks) | |
a4456856 DW |
2560 | { |
2561 | int rmw = 0, rcw = 0, i; | |
c8ac1803 N |
2562 | if (conf->max_degraded == 2) { |
2563 | /* RAID6 requires 'rcw' in current implementation | |
2564 | * Calculate the real rcw later - for now fake it | |
2565 | * look like rcw is cheaper | |
2566 | */ | |
2567 | rcw = 1; rmw = 2; | |
2568 | } else for (i = disks; i--; ) { | |
a4456856 DW |
2569 | /* would I have to read this buffer for read_modify_write */ |
2570 | struct r5dev *dev = &sh->dev[i]; | |
2571 | if ((dev->towrite || i == sh->pd_idx) && | |
2572 | !test_bit(R5_LOCKED, &dev->flags) && | |
f38e1219 DW |
2573 | !(test_bit(R5_UPTODATE, &dev->flags) || |
2574 | test_bit(R5_Wantcompute, &dev->flags))) { | |
a4456856 DW |
2575 | if (test_bit(R5_Insync, &dev->flags)) |
2576 | rmw++; | |
2577 | else | |
2578 | rmw += 2*disks; /* cannot read it */ | |
2579 | } | |
2580 | /* Would I have to read this buffer for reconstruct_write */ | |
2581 | if (!test_bit(R5_OVERWRITE, &dev->flags) && i != sh->pd_idx && | |
2582 | !test_bit(R5_LOCKED, &dev->flags) && | |
f38e1219 DW |
2583 | !(test_bit(R5_UPTODATE, &dev->flags) || |
2584 | test_bit(R5_Wantcompute, &dev->flags))) { | |
2585 | if (test_bit(R5_Insync, &dev->flags)) rcw++; | |
a4456856 DW |
2586 | else |
2587 | rcw += 2*disks; | |
2588 | } | |
2589 | } | |
45b4233c | 2590 | pr_debug("for sector %llu, rmw=%d rcw=%d\n", |
a4456856 DW |
2591 | (unsigned long long)sh->sector, rmw, rcw); |
2592 | set_bit(STRIPE_HANDLE, &sh->state); | |
2593 | if (rmw < rcw && rmw > 0) | |
2594 | /* prefer read-modify-write, but need to get some data */ | |
2595 | for (i = disks; i--; ) { | |
2596 | struct r5dev *dev = &sh->dev[i]; | |
2597 | if ((dev->towrite || i == sh->pd_idx) && | |
2598 | !test_bit(R5_LOCKED, &dev->flags) && | |
f38e1219 DW |
2599 | !(test_bit(R5_UPTODATE, &dev->flags) || |
2600 | test_bit(R5_Wantcompute, &dev->flags)) && | |
a4456856 DW |
2601 | test_bit(R5_Insync, &dev->flags)) { |
2602 | if ( | |
2603 | test_bit(STRIPE_PREREAD_ACTIVE, &sh->state)) { | |
45b4233c | 2604 | pr_debug("Read_old block " |
a4456856 DW |
2605 | "%d for r-m-w\n", i); |
2606 | set_bit(R5_LOCKED, &dev->flags); | |
2607 | set_bit(R5_Wantread, &dev->flags); | |
2608 | s->locked++; | |
2609 | } else { | |
2610 | set_bit(STRIPE_DELAYED, &sh->state); | |
2611 | set_bit(STRIPE_HANDLE, &sh->state); | |
2612 | } | |
2613 | } | |
2614 | } | |
c8ac1803 | 2615 | if (rcw <= rmw && rcw > 0) { |
a4456856 | 2616 | /* want reconstruct write, but need to get some data */ |
c8ac1803 | 2617 | rcw = 0; |
a4456856 DW |
2618 | for (i = disks; i--; ) { |
2619 | struct r5dev *dev = &sh->dev[i]; | |
2620 | if (!test_bit(R5_OVERWRITE, &dev->flags) && | |
c8ac1803 | 2621 | i != sh->pd_idx && i != sh->qd_idx && |
a4456856 | 2622 | !test_bit(R5_LOCKED, &dev->flags) && |
f38e1219 | 2623 | !(test_bit(R5_UPTODATE, &dev->flags) || |
c8ac1803 N |
2624 | test_bit(R5_Wantcompute, &dev->flags))) { |
2625 | rcw++; | |
2626 | if (!test_bit(R5_Insync, &dev->flags)) | |
2627 | continue; /* it's a failed drive */ | |
a4456856 DW |
2628 | if ( |
2629 | test_bit(STRIPE_PREREAD_ACTIVE, &sh->state)) { | |
45b4233c | 2630 | pr_debug("Read_old block " |
a4456856 DW |
2631 | "%d for Reconstruct\n", i); |
2632 | set_bit(R5_LOCKED, &dev->flags); | |
2633 | set_bit(R5_Wantread, &dev->flags); | |
2634 | s->locked++; | |
2635 | } else { | |
2636 | set_bit(STRIPE_DELAYED, &sh->state); | |
2637 | set_bit(STRIPE_HANDLE, &sh->state); | |
2638 | } | |
2639 | } | |
2640 | } | |
c8ac1803 | 2641 | } |
a4456856 DW |
2642 | /* now if nothing is locked, and if we have enough data, |
2643 | * we can start a write request | |
2644 | */ | |
f38e1219 DW |
2645 | /* since handle_stripe can be called at any time we need to handle the |
2646 | * case where a compute block operation has been submitted and then a | |
ac6b53b6 DW |
2647 | * subsequent call wants to start a write request. raid_run_ops only |
2648 | * handles the case where compute block and reconstruct are requested | |
f38e1219 DW |
2649 | * simultaneously. If this is not the case then new writes need to be |
2650 | * held off until the compute completes. | |
2651 | */ | |
976ea8d4 DW |
2652 | if ((s->req_compute || !test_bit(STRIPE_COMPUTE_RUN, &sh->state)) && |
2653 | (s->locked == 0 && (rcw == 0 || rmw == 0) && | |
2654 | !test_bit(STRIPE_BIT_DELAY, &sh->state))) | |
c0f7bddb | 2655 | schedule_reconstruction(sh, s, rcw == 0, 0); |
a4456856 DW |
2656 | } |
2657 | ||
a4456856 DW |
2658 | static void handle_parity_checks5(raid5_conf_t *conf, struct stripe_head *sh, |
2659 | struct stripe_head_state *s, int disks) | |
2660 | { | |
ecc65c9b | 2661 | struct r5dev *dev = NULL; |
bd2ab670 | 2662 | |
a4456856 | 2663 | set_bit(STRIPE_HANDLE, &sh->state); |
e89f8962 | 2664 | |
ecc65c9b DW |
2665 | switch (sh->check_state) { |
2666 | case check_state_idle: | |
2667 | /* start a new check operation if there are no failures */ | |
bd2ab670 | 2668 | if (s->failed == 0) { |
bd2ab670 | 2669 | BUG_ON(s->uptodate != disks); |
ecc65c9b DW |
2670 | sh->check_state = check_state_run; |
2671 | set_bit(STRIPE_OP_CHECK, &s->ops_request); | |
bd2ab670 | 2672 | clear_bit(R5_UPTODATE, &sh->dev[sh->pd_idx].flags); |
bd2ab670 | 2673 | s->uptodate--; |
ecc65c9b | 2674 | break; |
bd2ab670 | 2675 | } |
f2b3b44d | 2676 | dev = &sh->dev[s->failed_num[0]]; |
ecc65c9b DW |
2677 | /* fall through */ |
2678 | case check_state_compute_result: | |
2679 | sh->check_state = check_state_idle; | |
2680 | if (!dev) | |
2681 | dev = &sh->dev[sh->pd_idx]; | |
2682 | ||
2683 | /* check that a write has not made the stripe insync */ | |
2684 | if (test_bit(STRIPE_INSYNC, &sh->state)) | |
2685 | break; | |
c8894419 | 2686 | |
a4456856 | 2687 | /* either failed parity check, or recovery is happening */ |
a4456856 DW |
2688 | BUG_ON(!test_bit(R5_UPTODATE, &dev->flags)); |
2689 | BUG_ON(s->uptodate != disks); | |
2690 | ||
2691 | set_bit(R5_LOCKED, &dev->flags); | |
ecc65c9b | 2692 | s->locked++; |
a4456856 | 2693 | set_bit(R5_Wantwrite, &dev->flags); |
830ea016 | 2694 | |
a4456856 | 2695 | clear_bit(STRIPE_DEGRADED, &sh->state); |
a4456856 | 2696 | set_bit(STRIPE_INSYNC, &sh->state); |
ecc65c9b DW |
2697 | break; |
2698 | case check_state_run: | |
2699 | break; /* we will be called again upon completion */ | |
2700 | case check_state_check_result: | |
2701 | sh->check_state = check_state_idle; | |
2702 | ||
2703 | /* if a failure occurred during the check operation, leave | |
2704 | * STRIPE_INSYNC not set and let the stripe be handled again | |
2705 | */ | |
2706 | if (s->failed) | |
2707 | break; | |
2708 | ||
2709 | /* handle a successful check operation, if parity is correct | |
2710 | * we are done. Otherwise update the mismatch count and repair | |
2711 | * parity if !MD_RECOVERY_CHECK | |
2712 | */ | |
ad283ea4 | 2713 | if ((sh->ops.zero_sum_result & SUM_CHECK_P_RESULT) == 0) |
ecc65c9b DW |
2714 | /* parity is correct (on disc, |
2715 | * not in buffer any more) | |
2716 | */ | |
2717 | set_bit(STRIPE_INSYNC, &sh->state); | |
2718 | else { | |
2719 | conf->mddev->resync_mismatches += STRIPE_SECTORS; | |
2720 | if (test_bit(MD_RECOVERY_CHECK, &conf->mddev->recovery)) | |
2721 | /* don't try to repair!! */ | |
2722 | set_bit(STRIPE_INSYNC, &sh->state); | |
2723 | else { | |
2724 | sh->check_state = check_state_compute_run; | |
976ea8d4 | 2725 | set_bit(STRIPE_COMPUTE_RUN, &sh->state); |
ecc65c9b DW |
2726 | set_bit(STRIPE_OP_COMPUTE_BLK, &s->ops_request); |
2727 | set_bit(R5_Wantcompute, | |
2728 | &sh->dev[sh->pd_idx].flags); | |
2729 | sh->ops.target = sh->pd_idx; | |
ac6b53b6 | 2730 | sh->ops.target2 = -1; |
ecc65c9b DW |
2731 | s->uptodate++; |
2732 | } | |
2733 | } | |
2734 | break; | |
2735 | case check_state_compute_run: | |
2736 | break; | |
2737 | default: | |
2738 | printk(KERN_ERR "%s: unknown check_state: %d sector: %llu\n", | |
2739 | __func__, sh->check_state, | |
2740 | (unsigned long long) sh->sector); | |
2741 | BUG(); | |
a4456856 DW |
2742 | } |
2743 | } | |
2744 | ||
2745 | ||
2746 | static void handle_parity_checks6(raid5_conf_t *conf, struct stripe_head *sh, | |
36d1c647 | 2747 | struct stripe_head_state *s, |
f2b3b44d | 2748 | int disks) |
a4456856 | 2749 | { |
a4456856 | 2750 | int pd_idx = sh->pd_idx; |
34e04e87 | 2751 | int qd_idx = sh->qd_idx; |
d82dfee0 | 2752 | struct r5dev *dev; |
a4456856 DW |
2753 | |
2754 | set_bit(STRIPE_HANDLE, &sh->state); | |
2755 | ||
2756 | BUG_ON(s->failed > 2); | |
d82dfee0 | 2757 | |
a4456856 DW |
2758 | /* Want to check and possibly repair P and Q. |
2759 | * However there could be one 'failed' device, in which | |
2760 | * case we can only check one of them, possibly using the | |
2761 | * other to generate missing data | |
2762 | */ | |
2763 | ||
d82dfee0 DW |
2764 | switch (sh->check_state) { |
2765 | case check_state_idle: | |
2766 | /* start a new check operation if there are < 2 failures */ | |
f2b3b44d | 2767 | if (s->failed == s->q_failed) { |
d82dfee0 | 2768 | /* The only possible failed device holds Q, so it |
a4456856 DW |
2769 | * makes sense to check P (If anything else were failed, |
2770 | * we would have used P to recreate it). | |
2771 | */ | |
d82dfee0 | 2772 | sh->check_state = check_state_run; |
a4456856 | 2773 | } |
f2b3b44d | 2774 | if (!s->q_failed && s->failed < 2) { |
d82dfee0 | 2775 | /* Q is not failed, and we didn't use it to generate |
a4456856 DW |
2776 | * anything, so it makes sense to check it |
2777 | */ | |
d82dfee0 DW |
2778 | if (sh->check_state == check_state_run) |
2779 | sh->check_state = check_state_run_pq; | |
2780 | else | |
2781 | sh->check_state = check_state_run_q; | |
a4456856 | 2782 | } |
a4456856 | 2783 | |
d82dfee0 DW |
2784 | /* discard potentially stale zero_sum_result */ |
2785 | sh->ops.zero_sum_result = 0; | |
a4456856 | 2786 | |
d82dfee0 DW |
2787 | if (sh->check_state == check_state_run) { |
2788 | /* async_xor_zero_sum destroys the contents of P */ | |
2789 | clear_bit(R5_UPTODATE, &sh->dev[pd_idx].flags); | |
2790 | s->uptodate--; | |
a4456856 | 2791 | } |
d82dfee0 DW |
2792 | if (sh->check_state >= check_state_run && |
2793 | sh->check_state <= check_state_run_pq) { | |
2794 | /* async_syndrome_zero_sum preserves P and Q, so | |
2795 | * no need to mark them !uptodate here | |
2796 | */ | |
2797 | set_bit(STRIPE_OP_CHECK, &s->ops_request); | |
2798 | break; | |
a4456856 DW |
2799 | } |
2800 | ||
d82dfee0 DW |
2801 | /* we have 2-disk failure */ |
2802 | BUG_ON(s->failed != 2); | |
2803 | /* fall through */ | |
2804 | case check_state_compute_result: | |
2805 | sh->check_state = check_state_idle; | |
a4456856 | 2806 | |
d82dfee0 DW |
2807 | /* check that a write has not made the stripe insync */ |
2808 | if (test_bit(STRIPE_INSYNC, &sh->state)) | |
2809 | break; | |
a4456856 DW |
2810 | |
2811 | /* now write out any block on a failed drive, | |
d82dfee0 | 2812 | * or P or Q if they were recomputed |
a4456856 | 2813 | */ |
d82dfee0 | 2814 | BUG_ON(s->uptodate < disks - 1); /* We don't need Q to recover */ |
a4456856 | 2815 | if (s->failed == 2) { |
f2b3b44d | 2816 | dev = &sh->dev[s->failed_num[1]]; |
a4456856 DW |
2817 | s->locked++; |
2818 | set_bit(R5_LOCKED, &dev->flags); | |
2819 | set_bit(R5_Wantwrite, &dev->flags); | |
2820 | } | |
2821 | if (s->failed >= 1) { | |
f2b3b44d | 2822 | dev = &sh->dev[s->failed_num[0]]; |
a4456856 DW |
2823 | s->locked++; |
2824 | set_bit(R5_LOCKED, &dev->flags); | |
2825 | set_bit(R5_Wantwrite, &dev->flags); | |
2826 | } | |
d82dfee0 | 2827 | if (sh->ops.zero_sum_result & SUM_CHECK_P_RESULT) { |
a4456856 DW |
2828 | dev = &sh->dev[pd_idx]; |
2829 | s->locked++; | |
2830 | set_bit(R5_LOCKED, &dev->flags); | |
2831 | set_bit(R5_Wantwrite, &dev->flags); | |
2832 | } | |
d82dfee0 | 2833 | if (sh->ops.zero_sum_result & SUM_CHECK_Q_RESULT) { |
a4456856 DW |
2834 | dev = &sh->dev[qd_idx]; |
2835 | s->locked++; | |
2836 | set_bit(R5_LOCKED, &dev->flags); | |
2837 | set_bit(R5_Wantwrite, &dev->flags); | |
2838 | } | |
2839 | clear_bit(STRIPE_DEGRADED, &sh->state); | |
2840 | ||
2841 | set_bit(STRIPE_INSYNC, &sh->state); | |
d82dfee0 DW |
2842 | break; |
2843 | case check_state_run: | |
2844 | case check_state_run_q: | |
2845 | case check_state_run_pq: | |
2846 | break; /* we will be called again upon completion */ | |
2847 | case check_state_check_result: | |
2848 | sh->check_state = check_state_idle; | |
2849 | ||
2850 | /* handle a successful check operation, if parity is correct | |
2851 | * we are done. Otherwise update the mismatch count and repair | |
2852 | * parity if !MD_RECOVERY_CHECK | |
2853 | */ | |
2854 | if (sh->ops.zero_sum_result == 0) { | |
2855 | /* both parities are correct */ | |
2856 | if (!s->failed) | |
2857 | set_bit(STRIPE_INSYNC, &sh->state); | |
2858 | else { | |
2859 | /* in contrast to the raid5 case we can validate | |
2860 | * parity, but still have a failure to write | |
2861 | * back | |
2862 | */ | |
2863 | sh->check_state = check_state_compute_result; | |
2864 | /* Returning at this point means that we may go | |
2865 | * off and bring p and/or q uptodate again so | |
2866 | * we make sure to check zero_sum_result again | |
2867 | * to verify if p or q need writeback | |
2868 | */ | |
2869 | } | |
2870 | } else { | |
2871 | conf->mddev->resync_mismatches += STRIPE_SECTORS; | |
2872 | if (test_bit(MD_RECOVERY_CHECK, &conf->mddev->recovery)) | |
2873 | /* don't try to repair!! */ | |
2874 | set_bit(STRIPE_INSYNC, &sh->state); | |
2875 | else { | |
2876 | int *target = &sh->ops.target; | |
2877 | ||
2878 | sh->ops.target = -1; | |
2879 | sh->ops.target2 = -1; | |
2880 | sh->check_state = check_state_compute_run; | |
2881 | set_bit(STRIPE_COMPUTE_RUN, &sh->state); | |
2882 | set_bit(STRIPE_OP_COMPUTE_BLK, &s->ops_request); | |
2883 | if (sh->ops.zero_sum_result & SUM_CHECK_P_RESULT) { | |
2884 | set_bit(R5_Wantcompute, | |
2885 | &sh->dev[pd_idx].flags); | |
2886 | *target = pd_idx; | |
2887 | target = &sh->ops.target2; | |
2888 | s->uptodate++; | |
2889 | } | |
2890 | if (sh->ops.zero_sum_result & SUM_CHECK_Q_RESULT) { | |
2891 | set_bit(R5_Wantcompute, | |
2892 | &sh->dev[qd_idx].flags); | |
2893 | *target = qd_idx; | |
2894 | s->uptodate++; | |
2895 | } | |
2896 | } | |
2897 | } | |
2898 | break; | |
2899 | case check_state_compute_run: | |
2900 | break; | |
2901 | default: | |
2902 | printk(KERN_ERR "%s: unknown check_state: %d sector: %llu\n", | |
2903 | __func__, sh->check_state, | |
2904 | (unsigned long long) sh->sector); | |
2905 | BUG(); | |
a4456856 DW |
2906 | } |
2907 | } | |
2908 | ||
86c374ba | 2909 | static void handle_stripe_expansion(raid5_conf_t *conf, struct stripe_head *sh) |
a4456856 DW |
2910 | { |
2911 | int i; | |
2912 | ||
2913 | /* We have read all the blocks in this stripe and now we need to | |
2914 | * copy some of them into a target stripe for expand. | |
2915 | */ | |
f0a50d37 | 2916 | struct dma_async_tx_descriptor *tx = NULL; |
a4456856 DW |
2917 | clear_bit(STRIPE_EXPAND_SOURCE, &sh->state); |
2918 | for (i = 0; i < sh->disks; i++) | |
34e04e87 | 2919 | if (i != sh->pd_idx && i != sh->qd_idx) { |
911d4ee8 | 2920 | int dd_idx, j; |
a4456856 | 2921 | struct stripe_head *sh2; |
a08abd8c | 2922 | struct async_submit_ctl submit; |
a4456856 | 2923 | |
784052ec | 2924 | sector_t bn = compute_blocknr(sh, i, 1); |
911d4ee8 N |
2925 | sector_t s = raid5_compute_sector(conf, bn, 0, |
2926 | &dd_idx, NULL); | |
a8c906ca | 2927 | sh2 = get_active_stripe(conf, s, 0, 1, 1); |
a4456856 DW |
2928 | if (sh2 == NULL) |
2929 | /* so far only the early blocks of this stripe | |
2930 | * have been requested. When later blocks | |
2931 | * get requested, we will try again | |
2932 | */ | |
2933 | continue; | |
2934 | if (!test_bit(STRIPE_EXPANDING, &sh2->state) || | |
2935 | test_bit(R5_Expanded, &sh2->dev[dd_idx].flags)) { | |
2936 | /* must have already done this block */ | |
2937 | release_stripe(sh2); | |
2938 | continue; | |
2939 | } | |
f0a50d37 DW |
2940 | |
2941 | /* place all the copies on one channel */ | |
a08abd8c | 2942 | init_async_submit(&submit, 0, tx, NULL, NULL, NULL); |
f0a50d37 | 2943 | tx = async_memcpy(sh2->dev[dd_idx].page, |
88ba2aa5 | 2944 | sh->dev[i].page, 0, 0, STRIPE_SIZE, |
a08abd8c | 2945 | &submit); |
f0a50d37 | 2946 | |
a4456856 DW |
2947 | set_bit(R5_Expanded, &sh2->dev[dd_idx].flags); |
2948 | set_bit(R5_UPTODATE, &sh2->dev[dd_idx].flags); | |
2949 | for (j = 0; j < conf->raid_disks; j++) | |
2950 | if (j != sh2->pd_idx && | |
86c374ba | 2951 | j != sh2->qd_idx && |
a4456856 DW |
2952 | !test_bit(R5_Expanded, &sh2->dev[j].flags)) |
2953 | break; | |
2954 | if (j == conf->raid_disks) { | |
2955 | set_bit(STRIPE_EXPAND_READY, &sh2->state); | |
2956 | set_bit(STRIPE_HANDLE, &sh2->state); | |
2957 | } | |
2958 | release_stripe(sh2); | |
f0a50d37 | 2959 | |
a4456856 | 2960 | } |
a2e08551 N |
2961 | /* done submitting copies, wait for them to complete */ |
2962 | if (tx) { | |
2963 | async_tx_ack(tx); | |
2964 | dma_wait_for_async_tx(tx); | |
2965 | } | |
a4456856 | 2966 | } |
1da177e4 | 2967 | |
6bfe0b49 | 2968 | |
1da177e4 LT |
2969 | /* |
2970 | * handle_stripe - do things to a stripe. | |
2971 | * | |
2972 | * We lock the stripe and then examine the state of various bits | |
2973 | * to see what needs to be done. | |
2974 | * Possible results: | |
2975 | * return some read request which now have data | |
2976 | * return some write requests which are safely on disc | |
2977 | * schedule a read on some buffers | |
2978 | * schedule a write of some buffers | |
2979 | * return confirmation of parity correctness | |
2980 | * | |
1da177e4 LT |
2981 | * buffers are taken off read_list or write_list, and bh_cache buffers |
2982 | * get BH_Lock set before the stripe lock is released. | |
2983 | * | |
2984 | */ | |
a4456856 | 2985 | |
acfe726b | 2986 | static void analyse_stripe(struct stripe_head *sh, struct stripe_head_state *s) |
1da177e4 | 2987 | { |
bff61975 | 2988 | raid5_conf_t *conf = sh->raid_conf; |
f416885e | 2989 | int disks = sh->disks; |
474af965 N |
2990 | struct r5dev *dev; |
2991 | int i; | |
1da177e4 | 2992 | |
acfe726b N |
2993 | memset(s, 0, sizeof(*s)); |
2994 | ||
2995 | s->syncing = test_bit(STRIPE_SYNCING, &sh->state); | |
2996 | s->expanding = test_bit(STRIPE_EXPAND_SOURCE, &sh->state); | |
2997 | s->expanded = test_bit(STRIPE_EXPAND_READY, &sh->state); | |
2998 | s->failed_num[0] = -1; | |
2999 | s->failed_num[1] = -1; | |
1da177e4 | 3000 | |
acfe726b | 3001 | /* Now to look around and see what can be done */ |
1da177e4 | 3002 | rcu_read_lock(); |
c4c1663b | 3003 | spin_lock_irq(&conf->device_lock); |
16a53ecc N |
3004 | for (i=disks; i--; ) { |
3005 | mdk_rdev_t *rdev; | |
31c176ec N |
3006 | sector_t first_bad; |
3007 | int bad_sectors; | |
3008 | int is_bad = 0; | |
acfe726b | 3009 | |
16a53ecc | 3010 | dev = &sh->dev[i]; |
1da177e4 | 3011 | |
45b4233c | 3012 | pr_debug("check %d: state 0x%lx read %p write %p written %p\n", |
16a53ecc | 3013 | i, dev->flags, dev->toread, dev->towrite, dev->written); |
6c0069c0 YT |
3014 | /* maybe we can reply to a read |
3015 | * | |
3016 | * new wantfill requests are only permitted while | |
3017 | * ops_complete_biofill is guaranteed to be inactive | |
3018 | */ | |
3019 | if (test_bit(R5_UPTODATE, &dev->flags) && dev->toread && | |
3020 | !test_bit(STRIPE_BIOFILL_RUN, &sh->state)) | |
3021 | set_bit(R5_Wantfill, &dev->flags); | |
1da177e4 | 3022 | |
16a53ecc | 3023 | /* now count some things */ |
cc94015a N |
3024 | if (test_bit(R5_LOCKED, &dev->flags)) |
3025 | s->locked++; | |
3026 | if (test_bit(R5_UPTODATE, &dev->flags)) | |
3027 | s->uptodate++; | |
2d6e4ecc | 3028 | if (test_bit(R5_Wantcompute, &dev->flags)) { |
cc94015a N |
3029 | s->compute++; |
3030 | BUG_ON(s->compute > 2); | |
2d6e4ecc | 3031 | } |
1da177e4 | 3032 | |
acfe726b | 3033 | if (test_bit(R5_Wantfill, &dev->flags)) |
cc94015a | 3034 | s->to_fill++; |
acfe726b | 3035 | else if (dev->toread) |
cc94015a | 3036 | s->to_read++; |
16a53ecc | 3037 | if (dev->towrite) { |
cc94015a | 3038 | s->to_write++; |
16a53ecc | 3039 | if (!test_bit(R5_OVERWRITE, &dev->flags)) |
cc94015a | 3040 | s->non_overwrite++; |
16a53ecc | 3041 | } |
a4456856 | 3042 | if (dev->written) |
cc94015a | 3043 | s->written++; |
16a53ecc | 3044 | rdev = rcu_dereference(conf->disks[i].rdev); |
31c176ec N |
3045 | if (rdev) { |
3046 | is_bad = is_badblock(rdev, sh->sector, STRIPE_SECTORS, | |
3047 | &first_bad, &bad_sectors); | |
3048 | if (s->blocked_rdev == NULL | |
3049 | && (test_bit(Blocked, &rdev->flags) | |
3050 | || is_bad < 0)) { | |
3051 | if (is_bad < 0) | |
3052 | set_bit(BlockedBadBlocks, | |
3053 | &rdev->flags); | |
3054 | s->blocked_rdev = rdev; | |
3055 | atomic_inc(&rdev->nr_pending); | |
3056 | } | |
6bfe0b49 | 3057 | } |
415e72d0 N |
3058 | clear_bit(R5_Insync, &dev->flags); |
3059 | if (!rdev) | |
3060 | /* Not in-sync */; | |
31c176ec N |
3061 | else if (is_bad) { |
3062 | /* also not in-sync */ | |
3063 | if (!test_bit(WriteErrorSeen, &rdev->flags)) { | |
3064 | /* treat as in-sync, but with a read error | |
3065 | * which we can now try to correct | |
3066 | */ | |
3067 | set_bit(R5_Insync, &dev->flags); | |
3068 | set_bit(R5_ReadError, &dev->flags); | |
3069 | } | |
3070 | } else if (test_bit(In_sync, &rdev->flags)) | |
415e72d0 N |
3071 | set_bit(R5_Insync, &dev->flags); |
3072 | else { | |
3073 | /* in sync if before recovery_offset */ | |
3074 | if (sh->sector + STRIPE_SECTORS <= rdev->recovery_offset) | |
3075 | set_bit(R5_Insync, &dev->flags); | |
3076 | } | |
bc2607f3 N |
3077 | if (test_bit(R5_WriteError, &dev->flags)) { |
3078 | clear_bit(R5_Insync, &dev->flags); | |
3079 | if (!test_bit(Faulty, &rdev->flags)) { | |
3080 | s->handle_bad_blocks = 1; | |
3081 | atomic_inc(&rdev->nr_pending); | |
3082 | } else | |
3083 | clear_bit(R5_WriteError, &dev->flags); | |
3084 | } | |
b84db560 N |
3085 | if (test_bit(R5_MadeGood, &dev->flags)) { |
3086 | if (!test_bit(Faulty, &rdev->flags)) { | |
3087 | s->handle_bad_blocks = 1; | |
3088 | atomic_inc(&rdev->nr_pending); | |
3089 | } else | |
3090 | clear_bit(R5_MadeGood, &dev->flags); | |
3091 | } | |
415e72d0 | 3092 | if (!test_bit(R5_Insync, &dev->flags)) { |
16a53ecc N |
3093 | /* The ReadError flag will just be confusing now */ |
3094 | clear_bit(R5_ReadError, &dev->flags); | |
3095 | clear_bit(R5_ReWrite, &dev->flags); | |
1da177e4 | 3096 | } |
415e72d0 N |
3097 | if (test_bit(R5_ReadError, &dev->flags)) |
3098 | clear_bit(R5_Insync, &dev->flags); | |
3099 | if (!test_bit(R5_Insync, &dev->flags)) { | |
cc94015a N |
3100 | if (s->failed < 2) |
3101 | s->failed_num[s->failed] = i; | |
3102 | s->failed++; | |
415e72d0 | 3103 | } |
1da177e4 | 3104 | } |
c4c1663b | 3105 | spin_unlock_irq(&conf->device_lock); |
1da177e4 | 3106 | rcu_read_unlock(); |
cc94015a N |
3107 | } |
3108 | ||
3109 | static void handle_stripe(struct stripe_head *sh) | |
3110 | { | |
3111 | struct stripe_head_state s; | |
474af965 | 3112 | raid5_conf_t *conf = sh->raid_conf; |
3687c061 | 3113 | int i; |
84789554 N |
3114 | int prexor; |
3115 | int disks = sh->disks; | |
474af965 | 3116 | struct r5dev *pdev, *qdev; |
cc94015a N |
3117 | |
3118 | clear_bit(STRIPE_HANDLE, &sh->state); | |
3119 | if (test_and_set_bit(STRIPE_ACTIVE, &sh->state)) { | |
3120 | /* already being handled, ensure it gets handled | |
3121 | * again when current action finishes */ | |
3122 | set_bit(STRIPE_HANDLE, &sh->state); | |
3123 | return; | |
3124 | } | |
3125 | ||
3126 | if (test_and_clear_bit(STRIPE_SYNC_REQUESTED, &sh->state)) { | |
3127 | set_bit(STRIPE_SYNCING, &sh->state); | |
3128 | clear_bit(STRIPE_INSYNC, &sh->state); | |
3129 | } | |
3130 | clear_bit(STRIPE_DELAYED, &sh->state); | |
3131 | ||
3132 | pr_debug("handling stripe %llu, state=%#lx cnt=%d, " | |
3133 | "pd_idx=%d, qd_idx=%d\n, check:%d, reconstruct:%d\n", | |
3134 | (unsigned long long)sh->sector, sh->state, | |
3135 | atomic_read(&sh->count), sh->pd_idx, sh->qd_idx, | |
3136 | sh->check_state, sh->reconstruct_state); | |
3687c061 | 3137 | |
acfe726b | 3138 | analyse_stripe(sh, &s); |
c5a31000 | 3139 | |
bc2607f3 N |
3140 | if (s.handle_bad_blocks) { |
3141 | set_bit(STRIPE_HANDLE, &sh->state); | |
3142 | goto finish; | |
3143 | } | |
3144 | ||
474af965 N |
3145 | if (unlikely(s.blocked_rdev)) { |
3146 | if (s.syncing || s.expanding || s.expanded || | |
3147 | s.to_write || s.written) { | |
3148 | set_bit(STRIPE_HANDLE, &sh->state); | |
3149 | goto finish; | |
3150 | } | |
3151 | /* There is nothing for the blocked_rdev to block */ | |
3152 | rdev_dec_pending(s.blocked_rdev, conf->mddev); | |
3153 | s.blocked_rdev = NULL; | |
3154 | } | |
3155 | ||
3156 | if (s.to_fill && !test_bit(STRIPE_BIOFILL_RUN, &sh->state)) { | |
3157 | set_bit(STRIPE_OP_BIOFILL, &s.ops_request); | |
3158 | set_bit(STRIPE_BIOFILL_RUN, &sh->state); | |
3159 | } | |
3160 | ||
3161 | pr_debug("locked=%d uptodate=%d to_read=%d" | |
3162 | " to_write=%d failed=%d failed_num=%d,%d\n", | |
3163 | s.locked, s.uptodate, s.to_read, s.to_write, s.failed, | |
3164 | s.failed_num[0], s.failed_num[1]); | |
3165 | /* check if the array has lost more than max_degraded devices and, | |
3166 | * if so, some requests might need to be failed. | |
3167 | */ | |
3168 | if (s.failed > conf->max_degraded && s.to_read+s.to_write+s.written) | |
3169 | handle_failed_stripe(conf, sh, &s, disks, &s.return_bi); | |
7f0da59b N |
3170 | if (s.failed > conf->max_degraded && s.syncing) |
3171 | handle_failed_sync(conf, sh, &s); | |
474af965 N |
3172 | |
3173 | /* | |
3174 | * might be able to return some write requests if the parity blocks | |
3175 | * are safe, or on a failed drive | |
3176 | */ | |
3177 | pdev = &sh->dev[sh->pd_idx]; | |
3178 | s.p_failed = (s.failed >= 1 && s.failed_num[0] == sh->pd_idx) | |
3179 | || (s.failed >= 2 && s.failed_num[1] == sh->pd_idx); | |
3180 | qdev = &sh->dev[sh->qd_idx]; | |
3181 | s.q_failed = (s.failed >= 1 && s.failed_num[0] == sh->qd_idx) | |
3182 | || (s.failed >= 2 && s.failed_num[1] == sh->qd_idx) | |
3183 | || conf->level < 6; | |
3184 | ||
3185 | if (s.written && | |
3186 | (s.p_failed || ((test_bit(R5_Insync, &pdev->flags) | |
3187 | && !test_bit(R5_LOCKED, &pdev->flags) | |
3188 | && test_bit(R5_UPTODATE, &pdev->flags)))) && | |
3189 | (s.q_failed || ((test_bit(R5_Insync, &qdev->flags) | |
3190 | && !test_bit(R5_LOCKED, &qdev->flags) | |
3191 | && test_bit(R5_UPTODATE, &qdev->flags))))) | |
3192 | handle_stripe_clean_event(conf, sh, disks, &s.return_bi); | |
3193 | ||
3194 | /* Now we might consider reading some blocks, either to check/generate | |
3195 | * parity, or to satisfy requests | |
3196 | * or to load a block that is being partially written. | |
3197 | */ | |
3198 | if (s.to_read || s.non_overwrite | |
3199 | || (conf->level == 6 && s.to_write && s.failed) | |
3200 | || (s.syncing && (s.uptodate + s.compute < disks)) || s.expanding) | |
3201 | handle_stripe_fill(sh, &s, disks); | |
3202 | ||
84789554 N |
3203 | /* Now we check to see if any write operations have recently |
3204 | * completed | |
3205 | */ | |
3206 | prexor = 0; | |
3207 | if (sh->reconstruct_state == reconstruct_state_prexor_drain_result) | |
3208 | prexor = 1; | |
3209 | if (sh->reconstruct_state == reconstruct_state_drain_result || | |
3210 | sh->reconstruct_state == reconstruct_state_prexor_drain_result) { | |
3211 | sh->reconstruct_state = reconstruct_state_idle; | |
3212 | ||
3213 | /* All the 'written' buffers and the parity block are ready to | |
3214 | * be written back to disk | |
3215 | */ | |
3216 | BUG_ON(!test_bit(R5_UPTODATE, &sh->dev[sh->pd_idx].flags)); | |
3217 | BUG_ON(sh->qd_idx >= 0 && | |
3218 | !test_bit(R5_UPTODATE, &sh->dev[sh->qd_idx].flags)); | |
3219 | for (i = disks; i--; ) { | |
3220 | struct r5dev *dev = &sh->dev[i]; | |
3221 | if (test_bit(R5_LOCKED, &dev->flags) && | |
3222 | (i == sh->pd_idx || i == sh->qd_idx || | |
3223 | dev->written)) { | |
3224 | pr_debug("Writing block %d\n", i); | |
3225 | set_bit(R5_Wantwrite, &dev->flags); | |
3226 | if (prexor) | |
3227 | continue; | |
3228 | if (!test_bit(R5_Insync, &dev->flags) || | |
3229 | ((i == sh->pd_idx || i == sh->qd_idx) && | |
3230 | s.failed == 0)) | |
3231 | set_bit(STRIPE_INSYNC, &sh->state); | |
3232 | } | |
3233 | } | |
3234 | if (test_and_clear_bit(STRIPE_PREREAD_ACTIVE, &sh->state)) | |
3235 | s.dec_preread_active = 1; | |
3236 | } | |
3237 | ||
3238 | /* Now to consider new write requests and what else, if anything | |
3239 | * should be read. We do not handle new writes when: | |
3240 | * 1/ A 'write' operation (copy+xor) is already in flight. | |
3241 | * 2/ A 'check' operation is in flight, as it may clobber the parity | |
3242 | * block. | |
3243 | */ | |
3244 | if (s.to_write && !sh->reconstruct_state && !sh->check_state) | |
3245 | handle_stripe_dirtying(conf, sh, &s, disks); | |
3246 | ||
3247 | /* maybe we need to check and possibly fix the parity for this stripe | |
3248 | * Any reads will already have been scheduled, so we just see if enough | |
3249 | * data is available. The parity check is held off while parity | |
3250 | * dependent operations are in flight. | |
3251 | */ | |
3252 | if (sh->check_state || | |
3253 | (s.syncing && s.locked == 0 && | |
3254 | !test_bit(STRIPE_COMPUTE_RUN, &sh->state) && | |
3255 | !test_bit(STRIPE_INSYNC, &sh->state))) { | |
3256 | if (conf->level == 6) | |
3257 | handle_parity_checks6(conf, sh, &s, disks); | |
3258 | else | |
3259 | handle_parity_checks5(conf, sh, &s, disks); | |
3260 | } | |
c5a31000 N |
3261 | |
3262 | if (s.syncing && s.locked == 0 && test_bit(STRIPE_INSYNC, &sh->state)) { | |
3263 | md_done_sync(conf->mddev, STRIPE_SECTORS, 1); | |
3264 | clear_bit(STRIPE_SYNCING, &sh->state); | |
3265 | } | |
3266 | ||
3267 | /* If the failed drives are just a ReadError, then we might need | |
3268 | * to progress the repair/check process | |
3269 | */ | |
3270 | if (s.failed <= conf->max_degraded && !conf->mddev->ro) | |
3271 | for (i = 0; i < s.failed; i++) { | |
3272 | struct r5dev *dev = &sh->dev[s.failed_num[i]]; | |
3273 | if (test_bit(R5_ReadError, &dev->flags) | |
3274 | && !test_bit(R5_LOCKED, &dev->flags) | |
3275 | && test_bit(R5_UPTODATE, &dev->flags) | |
3276 | ) { | |
3277 | if (!test_bit(R5_ReWrite, &dev->flags)) { | |
3278 | set_bit(R5_Wantwrite, &dev->flags); | |
3279 | set_bit(R5_ReWrite, &dev->flags); | |
3280 | set_bit(R5_LOCKED, &dev->flags); | |
3281 | s.locked++; | |
3282 | } else { | |
3283 | /* let's read it back */ | |
3284 | set_bit(R5_Wantread, &dev->flags); | |
3285 | set_bit(R5_LOCKED, &dev->flags); | |
3286 | s.locked++; | |
3287 | } | |
3288 | } | |
3289 | } | |
3290 | ||
3291 | ||
3687c061 N |
3292 | /* Finish reconstruct operations initiated by the expansion process */ |
3293 | if (sh->reconstruct_state == reconstruct_state_result) { | |
3294 | struct stripe_head *sh_src | |
3295 | = get_active_stripe(conf, sh->sector, 1, 1, 1); | |
3296 | if (sh_src && test_bit(STRIPE_EXPAND_SOURCE, &sh_src->state)) { | |
3297 | /* sh cannot be written until sh_src has been read. | |
3298 | * so arrange for sh to be delayed a little | |
3299 | */ | |
3300 | set_bit(STRIPE_DELAYED, &sh->state); | |
3301 | set_bit(STRIPE_HANDLE, &sh->state); | |
3302 | if (!test_and_set_bit(STRIPE_PREREAD_ACTIVE, | |
3303 | &sh_src->state)) | |
3304 | atomic_inc(&conf->preread_active_stripes); | |
3305 | release_stripe(sh_src); | |
3306 | goto finish; | |
3307 | } | |
3308 | if (sh_src) | |
3309 | release_stripe(sh_src); | |
3310 | ||
3311 | sh->reconstruct_state = reconstruct_state_idle; | |
3312 | clear_bit(STRIPE_EXPANDING, &sh->state); | |
3313 | for (i = conf->raid_disks; i--; ) { | |
3314 | set_bit(R5_Wantwrite, &sh->dev[i].flags); | |
3315 | set_bit(R5_LOCKED, &sh->dev[i].flags); | |
3316 | s.locked++; | |
3317 | } | |
3318 | } | |
f416885e | 3319 | |
3687c061 N |
3320 | if (s.expanded && test_bit(STRIPE_EXPANDING, &sh->state) && |
3321 | !sh->reconstruct_state) { | |
3322 | /* Need to write out all blocks after computing parity */ | |
3323 | sh->disks = conf->raid_disks; | |
3324 | stripe_set_idx(sh->sector, conf, 0, sh); | |
3325 | schedule_reconstruction(sh, &s, 1, 1); | |
3326 | } else if (s.expanded && !sh->reconstruct_state && s.locked == 0) { | |
3327 | clear_bit(STRIPE_EXPAND_READY, &sh->state); | |
3328 | atomic_dec(&conf->reshape_stripes); | |
3329 | wake_up(&conf->wait_for_overlap); | |
3330 | md_done_sync(conf->mddev, STRIPE_SECTORS, 1); | |
3331 | } | |
3332 | ||
3333 | if (s.expanding && s.locked == 0 && | |
3334 | !test_bit(STRIPE_COMPUTE_RUN, &sh->state)) | |
3335 | handle_stripe_expansion(conf, sh); | |
16a53ecc | 3336 | |
3687c061 | 3337 | finish: |
6bfe0b49 | 3338 | /* wait for this device to become unblocked */ |
c5709ef6 N |
3339 | if (unlikely(s.blocked_rdev)) |
3340 | md_wait_for_blocked_rdev(s.blocked_rdev, conf->mddev); | |
6bfe0b49 | 3341 | |
bc2607f3 N |
3342 | if (s.handle_bad_blocks) |
3343 | for (i = disks; i--; ) { | |
3344 | mdk_rdev_t *rdev; | |
3345 | struct r5dev *dev = &sh->dev[i]; | |
3346 | if (test_and_clear_bit(R5_WriteError, &dev->flags)) { | |
3347 | /* We own a safe reference to the rdev */ | |
3348 | rdev = conf->disks[i].rdev; | |
3349 | if (!rdev_set_badblocks(rdev, sh->sector, | |
3350 | STRIPE_SECTORS, 0)) | |
3351 | md_error(conf->mddev, rdev); | |
3352 | rdev_dec_pending(rdev, conf->mddev); | |
3353 | } | |
b84db560 N |
3354 | if (test_and_clear_bit(R5_MadeGood, &dev->flags)) { |
3355 | rdev = conf->disks[i].rdev; | |
3356 | rdev_clear_badblocks(rdev, sh->sector, | |
3357 | STRIPE_SECTORS); | |
3358 | rdev_dec_pending(rdev, conf->mddev); | |
3359 | } | |
bc2607f3 N |
3360 | } |
3361 | ||
6c0069c0 YT |
3362 | if (s.ops_request) |
3363 | raid_run_ops(sh, s.ops_request); | |
3364 | ||
f0e43bcd | 3365 | ops_run_io(sh, &s); |
16a53ecc | 3366 | |
c5709ef6 | 3367 | if (s.dec_preread_active) { |
729a1866 | 3368 | /* We delay this until after ops_run_io so that if make_request |
e9c7469b | 3369 | * is waiting on a flush, it won't continue until the writes |
729a1866 N |
3370 | * have actually been submitted. |
3371 | */ | |
3372 | atomic_dec(&conf->preread_active_stripes); | |
3373 | if (atomic_read(&conf->preread_active_stripes) < | |
3374 | IO_THRESHOLD) | |
3375 | md_wakeup_thread(conf->mddev->thread); | |
3376 | } | |
3377 | ||
c5709ef6 | 3378 | return_io(s.return_bi); |
16a53ecc | 3379 | |
c4c1663b | 3380 | clear_bit(STRIPE_ACTIVE, &sh->state); |
16a53ecc N |
3381 | } |
3382 | ||
16a53ecc N |
3383 | static void raid5_activate_delayed(raid5_conf_t *conf) |
3384 | { | |
3385 | if (atomic_read(&conf->preread_active_stripes) < IO_THRESHOLD) { | |
3386 | while (!list_empty(&conf->delayed_list)) { | |
3387 | struct list_head *l = conf->delayed_list.next; | |
3388 | struct stripe_head *sh; | |
3389 | sh = list_entry(l, struct stripe_head, lru); | |
3390 | list_del_init(l); | |
3391 | clear_bit(STRIPE_DELAYED, &sh->state); | |
3392 | if (!test_and_set_bit(STRIPE_PREREAD_ACTIVE, &sh->state)) | |
3393 | atomic_inc(&conf->preread_active_stripes); | |
8b3e6cdc | 3394 | list_add_tail(&sh->lru, &conf->hold_list); |
16a53ecc | 3395 | } |
482c0834 | 3396 | } |
16a53ecc N |
3397 | } |
3398 | ||
3399 | static void activate_bit_delay(raid5_conf_t *conf) | |
3400 | { | |
3401 | /* device_lock is held */ | |
3402 | struct list_head head; | |
3403 | list_add(&head, &conf->bitmap_list); | |
3404 | list_del_init(&conf->bitmap_list); | |
3405 | while (!list_empty(&head)) { | |
3406 | struct stripe_head *sh = list_entry(head.next, struct stripe_head, lru); | |
3407 | list_del_init(&sh->lru); | |
3408 | atomic_inc(&sh->count); | |
3409 | __release_stripe(conf, sh); | |
3410 | } | |
3411 | } | |
3412 | ||
11d8a6e3 | 3413 | int md_raid5_congested(mddev_t *mddev, int bits) |
f022b2fd | 3414 | { |
070ec55d | 3415 | raid5_conf_t *conf = mddev->private; |
f022b2fd N |
3416 | |
3417 | /* No difference between reads and writes. Just check | |
3418 | * how busy the stripe_cache is | |
3419 | */ | |
3fa841d7 | 3420 | |
f022b2fd N |
3421 | if (conf->inactive_blocked) |
3422 | return 1; | |
3423 | if (conf->quiesce) | |
3424 | return 1; | |
3425 | if (list_empty_careful(&conf->inactive_list)) | |
3426 | return 1; | |
3427 | ||
3428 | return 0; | |
3429 | } | |
11d8a6e3 N |
3430 | EXPORT_SYMBOL_GPL(md_raid5_congested); |
3431 | ||
3432 | static int raid5_congested(void *data, int bits) | |
3433 | { | |
3434 | mddev_t *mddev = data; | |
3435 | ||
3436 | return mddev_congested(mddev, bits) || | |
3437 | md_raid5_congested(mddev, bits); | |
3438 | } | |
f022b2fd | 3439 | |
23032a0e RBJ |
3440 | /* We want read requests to align with chunks where possible, |
3441 | * but write requests don't need to. | |
3442 | */ | |
cc371e66 AK |
3443 | static int raid5_mergeable_bvec(struct request_queue *q, |
3444 | struct bvec_merge_data *bvm, | |
3445 | struct bio_vec *biovec) | |
23032a0e RBJ |
3446 | { |
3447 | mddev_t *mddev = q->queuedata; | |
cc371e66 | 3448 | sector_t sector = bvm->bi_sector + get_start_sect(bvm->bi_bdev); |
23032a0e | 3449 | int max; |
9d8f0363 | 3450 | unsigned int chunk_sectors = mddev->chunk_sectors; |
cc371e66 | 3451 | unsigned int bio_sectors = bvm->bi_size >> 9; |
23032a0e | 3452 | |
cc371e66 | 3453 | if ((bvm->bi_rw & 1) == WRITE) |
23032a0e RBJ |
3454 | return biovec->bv_len; /* always allow writes to be mergeable */ |
3455 | ||
664e7c41 AN |
3456 | if (mddev->new_chunk_sectors < mddev->chunk_sectors) |
3457 | chunk_sectors = mddev->new_chunk_sectors; | |
23032a0e RBJ |
3458 | max = (chunk_sectors - ((sector & (chunk_sectors - 1)) + bio_sectors)) << 9; |
3459 | if (max < 0) max = 0; | |
3460 | if (max <= biovec->bv_len && bio_sectors == 0) | |
3461 | return biovec->bv_len; | |
3462 | else | |
3463 | return max; | |
3464 | } | |
3465 | ||
f679623f RBJ |
3466 | |
3467 | static int in_chunk_boundary(mddev_t *mddev, struct bio *bio) | |
3468 | { | |
3469 | sector_t sector = bio->bi_sector + get_start_sect(bio->bi_bdev); | |
9d8f0363 | 3470 | unsigned int chunk_sectors = mddev->chunk_sectors; |
f679623f RBJ |
3471 | unsigned int bio_sectors = bio->bi_size >> 9; |
3472 | ||
664e7c41 AN |
3473 | if (mddev->new_chunk_sectors < mddev->chunk_sectors) |
3474 | chunk_sectors = mddev->new_chunk_sectors; | |
f679623f RBJ |
3475 | return chunk_sectors >= |
3476 | ((sector & (chunk_sectors - 1)) + bio_sectors); | |
3477 | } | |
3478 | ||
46031f9a RBJ |
3479 | /* |
3480 | * add bio to the retry LIFO ( in O(1) ... we are in interrupt ) | |
3481 | * later sampled by raid5d. | |
3482 | */ | |
3483 | static void add_bio_to_retry(struct bio *bi,raid5_conf_t *conf) | |
3484 | { | |
3485 | unsigned long flags; | |
3486 | ||
3487 | spin_lock_irqsave(&conf->device_lock, flags); | |
3488 | ||
3489 | bi->bi_next = conf->retry_read_aligned_list; | |
3490 | conf->retry_read_aligned_list = bi; | |
3491 | ||
3492 | spin_unlock_irqrestore(&conf->device_lock, flags); | |
3493 | md_wakeup_thread(conf->mddev->thread); | |
3494 | } | |
3495 | ||
3496 | ||
3497 | static struct bio *remove_bio_from_retry(raid5_conf_t *conf) | |
3498 | { | |
3499 | struct bio *bi; | |
3500 | ||
3501 | bi = conf->retry_read_aligned; | |
3502 | if (bi) { | |
3503 | conf->retry_read_aligned = NULL; | |
3504 | return bi; | |
3505 | } | |
3506 | bi = conf->retry_read_aligned_list; | |
3507 | if(bi) { | |
387bb173 | 3508 | conf->retry_read_aligned_list = bi->bi_next; |
46031f9a | 3509 | bi->bi_next = NULL; |
960e739d JA |
3510 | /* |
3511 | * this sets the active strip count to 1 and the processed | |
3512 | * strip count to zero (upper 8 bits) | |
3513 | */ | |
46031f9a | 3514 | bi->bi_phys_segments = 1; /* biased count of active stripes */ |
46031f9a RBJ |
3515 | } |
3516 | ||
3517 | return bi; | |
3518 | } | |
3519 | ||
3520 | ||
f679623f RBJ |
3521 | /* |
3522 | * The "raid5_align_endio" should check if the read succeeded and if it | |
3523 | * did, call bio_endio on the original bio (having bio_put the new bio | |
3524 | * first). | |
3525 | * If the read failed.. | |
3526 | */ | |
6712ecf8 | 3527 | static void raid5_align_endio(struct bio *bi, int error) |
f679623f RBJ |
3528 | { |
3529 | struct bio* raid_bi = bi->bi_private; | |
46031f9a RBJ |
3530 | mddev_t *mddev; |
3531 | raid5_conf_t *conf; | |
3532 | int uptodate = test_bit(BIO_UPTODATE, &bi->bi_flags); | |
3533 | mdk_rdev_t *rdev; | |
3534 | ||
f679623f | 3535 | bio_put(bi); |
46031f9a | 3536 | |
46031f9a RBJ |
3537 | rdev = (void*)raid_bi->bi_next; |
3538 | raid_bi->bi_next = NULL; | |
2b7f2228 N |
3539 | mddev = rdev->mddev; |
3540 | conf = mddev->private; | |
46031f9a RBJ |
3541 | |
3542 | rdev_dec_pending(rdev, conf->mddev); | |
3543 | ||
3544 | if (!error && uptodate) { | |
6712ecf8 | 3545 | bio_endio(raid_bi, 0); |
46031f9a RBJ |
3546 | if (atomic_dec_and_test(&conf->active_aligned_reads)) |
3547 | wake_up(&conf->wait_for_stripe); | |
6712ecf8 | 3548 | return; |
46031f9a RBJ |
3549 | } |
3550 | ||
3551 | ||
45b4233c | 3552 | pr_debug("raid5_align_endio : io error...handing IO for a retry\n"); |
46031f9a RBJ |
3553 | |
3554 | add_bio_to_retry(raid_bi, conf); | |
f679623f RBJ |
3555 | } |
3556 | ||
387bb173 NB |
3557 | static int bio_fits_rdev(struct bio *bi) |
3558 | { | |
165125e1 | 3559 | struct request_queue *q = bdev_get_queue(bi->bi_bdev); |
387bb173 | 3560 | |
ae03bf63 | 3561 | if ((bi->bi_size>>9) > queue_max_sectors(q)) |
387bb173 NB |
3562 | return 0; |
3563 | blk_recount_segments(q, bi); | |
8a78362c | 3564 | if (bi->bi_phys_segments > queue_max_segments(q)) |
387bb173 NB |
3565 | return 0; |
3566 | ||
3567 | if (q->merge_bvec_fn) | |
3568 | /* it's too hard to apply the merge_bvec_fn at this stage, | |
3569 | * just just give up | |
3570 | */ | |
3571 | return 0; | |
3572 | ||
3573 | return 1; | |
3574 | } | |
3575 | ||
3576 | ||
21a52c6d | 3577 | static int chunk_aligned_read(mddev_t *mddev, struct bio * raid_bio) |
f679623f | 3578 | { |
070ec55d | 3579 | raid5_conf_t *conf = mddev->private; |
8553fe7e | 3580 | int dd_idx; |
f679623f RBJ |
3581 | struct bio* align_bi; |
3582 | mdk_rdev_t *rdev; | |
3583 | ||
3584 | if (!in_chunk_boundary(mddev, raid_bio)) { | |
45b4233c | 3585 | pr_debug("chunk_aligned_read : non aligned\n"); |
f679623f RBJ |
3586 | return 0; |
3587 | } | |
3588 | /* | |
a167f663 | 3589 | * use bio_clone_mddev to make a copy of the bio |
f679623f | 3590 | */ |
a167f663 | 3591 | align_bi = bio_clone_mddev(raid_bio, GFP_NOIO, mddev); |
f679623f RBJ |
3592 | if (!align_bi) |
3593 | return 0; | |
3594 | /* | |
3595 | * set bi_end_io to a new function, and set bi_private to the | |
3596 | * original bio. | |
3597 | */ | |
3598 | align_bi->bi_end_io = raid5_align_endio; | |
3599 | align_bi->bi_private = raid_bio; | |
3600 | /* | |
3601 | * compute position | |
3602 | */ | |
112bf897 N |
3603 | align_bi->bi_sector = raid5_compute_sector(conf, raid_bio->bi_sector, |
3604 | 0, | |
911d4ee8 | 3605 | &dd_idx, NULL); |
f679623f RBJ |
3606 | |
3607 | rcu_read_lock(); | |
3608 | rdev = rcu_dereference(conf->disks[dd_idx].rdev); | |
3609 | if (rdev && test_bit(In_sync, &rdev->flags)) { | |
31c176ec N |
3610 | sector_t first_bad; |
3611 | int bad_sectors; | |
3612 | ||
f679623f RBJ |
3613 | atomic_inc(&rdev->nr_pending); |
3614 | rcu_read_unlock(); | |
46031f9a RBJ |
3615 | raid_bio->bi_next = (void*)rdev; |
3616 | align_bi->bi_bdev = rdev->bdev; | |
3617 | align_bi->bi_flags &= ~(1 << BIO_SEG_VALID); | |
3618 | align_bi->bi_sector += rdev->data_offset; | |
3619 | ||
31c176ec N |
3620 | if (!bio_fits_rdev(align_bi) || |
3621 | is_badblock(rdev, align_bi->bi_sector, align_bi->bi_size>>9, | |
3622 | &first_bad, &bad_sectors)) { | |
3623 | /* too big in some way, or has a known bad block */ | |
387bb173 NB |
3624 | bio_put(align_bi); |
3625 | rdev_dec_pending(rdev, mddev); | |
3626 | return 0; | |
3627 | } | |
3628 | ||
46031f9a RBJ |
3629 | spin_lock_irq(&conf->device_lock); |
3630 | wait_event_lock_irq(conf->wait_for_stripe, | |
3631 | conf->quiesce == 0, | |
3632 | conf->device_lock, /* nothing */); | |
3633 | atomic_inc(&conf->active_aligned_reads); | |
3634 | spin_unlock_irq(&conf->device_lock); | |
3635 | ||
f679623f RBJ |
3636 | generic_make_request(align_bi); |
3637 | return 1; | |
3638 | } else { | |
3639 | rcu_read_unlock(); | |
46031f9a | 3640 | bio_put(align_bi); |
f679623f RBJ |
3641 | return 0; |
3642 | } | |
3643 | } | |
3644 | ||
8b3e6cdc DW |
3645 | /* __get_priority_stripe - get the next stripe to process |
3646 | * | |
3647 | * Full stripe writes are allowed to pass preread active stripes up until | |
3648 | * the bypass_threshold is exceeded. In general the bypass_count | |
3649 | * increments when the handle_list is handled before the hold_list; however, it | |
3650 | * will not be incremented when STRIPE_IO_STARTED is sampled set signifying a | |
3651 | * stripe with in flight i/o. The bypass_count will be reset when the | |
3652 | * head of the hold_list has changed, i.e. the head was promoted to the | |
3653 | * handle_list. | |
3654 | */ | |
3655 | static struct stripe_head *__get_priority_stripe(raid5_conf_t *conf) | |
3656 | { | |
3657 | struct stripe_head *sh; | |
3658 | ||
3659 | pr_debug("%s: handle: %s hold: %s full_writes: %d bypass_count: %d\n", | |
3660 | __func__, | |
3661 | list_empty(&conf->handle_list) ? "empty" : "busy", | |
3662 | list_empty(&conf->hold_list) ? "empty" : "busy", | |
3663 | atomic_read(&conf->pending_full_writes), conf->bypass_count); | |
3664 | ||
3665 | if (!list_empty(&conf->handle_list)) { | |
3666 | sh = list_entry(conf->handle_list.next, typeof(*sh), lru); | |
3667 | ||
3668 | if (list_empty(&conf->hold_list)) | |
3669 | conf->bypass_count = 0; | |
3670 | else if (!test_bit(STRIPE_IO_STARTED, &sh->state)) { | |
3671 | if (conf->hold_list.next == conf->last_hold) | |
3672 | conf->bypass_count++; | |
3673 | else { | |
3674 | conf->last_hold = conf->hold_list.next; | |
3675 | conf->bypass_count -= conf->bypass_threshold; | |
3676 | if (conf->bypass_count < 0) | |
3677 | conf->bypass_count = 0; | |
3678 | } | |
3679 | } | |
3680 | } else if (!list_empty(&conf->hold_list) && | |
3681 | ((conf->bypass_threshold && | |
3682 | conf->bypass_count > conf->bypass_threshold) || | |
3683 | atomic_read(&conf->pending_full_writes) == 0)) { | |
3684 | sh = list_entry(conf->hold_list.next, | |
3685 | typeof(*sh), lru); | |
3686 | conf->bypass_count -= conf->bypass_threshold; | |
3687 | if (conf->bypass_count < 0) | |
3688 | conf->bypass_count = 0; | |
3689 | } else | |
3690 | return NULL; | |
3691 | ||
3692 | list_del_init(&sh->lru); | |
3693 | atomic_inc(&sh->count); | |
3694 | BUG_ON(atomic_read(&sh->count) != 1); | |
3695 | return sh; | |
3696 | } | |
f679623f | 3697 | |
21a52c6d | 3698 | static int make_request(mddev_t *mddev, struct bio * bi) |
1da177e4 | 3699 | { |
070ec55d | 3700 | raid5_conf_t *conf = mddev->private; |
911d4ee8 | 3701 | int dd_idx; |
1da177e4 LT |
3702 | sector_t new_sector; |
3703 | sector_t logical_sector, last_sector; | |
3704 | struct stripe_head *sh; | |
a362357b | 3705 | const int rw = bio_data_dir(bi); |
49077326 | 3706 | int remaining; |
7c13edc8 | 3707 | int plugged; |
1da177e4 | 3708 | |
e9c7469b TH |
3709 | if (unlikely(bi->bi_rw & REQ_FLUSH)) { |
3710 | md_flush_request(mddev, bi); | |
e5dcdd80 N |
3711 | return 0; |
3712 | } | |
3713 | ||
3d310eb7 | 3714 | md_write_start(mddev, bi); |
06d91a5f | 3715 | |
802ba064 | 3716 | if (rw == READ && |
52488615 | 3717 | mddev->reshape_position == MaxSector && |
21a52c6d | 3718 | chunk_aligned_read(mddev,bi)) |
99c0fb5f | 3719 | return 0; |
52488615 | 3720 | |
1da177e4 LT |
3721 | logical_sector = bi->bi_sector & ~((sector_t)STRIPE_SECTORS-1); |
3722 | last_sector = bi->bi_sector + (bi->bi_size>>9); | |
3723 | bi->bi_next = NULL; | |
3724 | bi->bi_phys_segments = 1; /* over-loaded to count active stripes */ | |
06d91a5f | 3725 | |
7c13edc8 | 3726 | plugged = mddev_check_plugged(mddev); |
1da177e4 LT |
3727 | for (;logical_sector < last_sector; logical_sector += STRIPE_SECTORS) { |
3728 | DEFINE_WAIT(w); | |
16a53ecc | 3729 | int disks, data_disks; |
b5663ba4 | 3730 | int previous; |
b578d55f | 3731 | |
7ecaa1e6 | 3732 | retry: |
b5663ba4 | 3733 | previous = 0; |
b0f9ec04 | 3734 | disks = conf->raid_disks; |
b578d55f | 3735 | prepare_to_wait(&conf->wait_for_overlap, &w, TASK_UNINTERRUPTIBLE); |
b0f9ec04 | 3736 | if (unlikely(conf->reshape_progress != MaxSector)) { |
fef9c61f | 3737 | /* spinlock is needed as reshape_progress may be |
df8e7f76 N |
3738 | * 64bit on a 32bit platform, and so it might be |
3739 | * possible to see a half-updated value | |
aeb878b0 | 3740 | * Of course reshape_progress could change after |
df8e7f76 N |
3741 | * the lock is dropped, so once we get a reference |
3742 | * to the stripe that we think it is, we will have | |
3743 | * to check again. | |
3744 | */ | |
7ecaa1e6 | 3745 | spin_lock_irq(&conf->device_lock); |
fef9c61f N |
3746 | if (mddev->delta_disks < 0 |
3747 | ? logical_sector < conf->reshape_progress | |
3748 | : logical_sector >= conf->reshape_progress) { | |
7ecaa1e6 | 3749 | disks = conf->previous_raid_disks; |
b5663ba4 N |
3750 | previous = 1; |
3751 | } else { | |
fef9c61f N |
3752 | if (mddev->delta_disks < 0 |
3753 | ? logical_sector < conf->reshape_safe | |
3754 | : logical_sector >= conf->reshape_safe) { | |
b578d55f N |
3755 | spin_unlock_irq(&conf->device_lock); |
3756 | schedule(); | |
3757 | goto retry; | |
3758 | } | |
3759 | } | |
7ecaa1e6 N |
3760 | spin_unlock_irq(&conf->device_lock); |
3761 | } | |
16a53ecc N |
3762 | data_disks = disks - conf->max_degraded; |
3763 | ||
112bf897 N |
3764 | new_sector = raid5_compute_sector(conf, logical_sector, |
3765 | previous, | |
911d4ee8 | 3766 | &dd_idx, NULL); |
0c55e022 | 3767 | pr_debug("raid456: make_request, sector %llu logical %llu\n", |
1da177e4 LT |
3768 | (unsigned long long)new_sector, |
3769 | (unsigned long long)logical_sector); | |
3770 | ||
b5663ba4 | 3771 | sh = get_active_stripe(conf, new_sector, previous, |
a8c906ca | 3772 | (bi->bi_rw&RWA_MASK), 0); |
1da177e4 | 3773 | if (sh) { |
b0f9ec04 | 3774 | if (unlikely(previous)) { |
7ecaa1e6 | 3775 | /* expansion might have moved on while waiting for a |
df8e7f76 N |
3776 | * stripe, so we must do the range check again. |
3777 | * Expansion could still move past after this | |
3778 | * test, but as we are holding a reference to | |
3779 | * 'sh', we know that if that happens, | |
3780 | * STRIPE_EXPANDING will get set and the expansion | |
3781 | * won't proceed until we finish with the stripe. | |
7ecaa1e6 N |
3782 | */ |
3783 | int must_retry = 0; | |
3784 | spin_lock_irq(&conf->device_lock); | |
b0f9ec04 N |
3785 | if (mddev->delta_disks < 0 |
3786 | ? logical_sector >= conf->reshape_progress | |
3787 | : logical_sector < conf->reshape_progress) | |
7ecaa1e6 N |
3788 | /* mismatch, need to try again */ |
3789 | must_retry = 1; | |
3790 | spin_unlock_irq(&conf->device_lock); | |
3791 | if (must_retry) { | |
3792 | release_stripe(sh); | |
7a3ab908 | 3793 | schedule(); |
7ecaa1e6 N |
3794 | goto retry; |
3795 | } | |
3796 | } | |
e62e58a5 | 3797 | |
ffd96e35 | 3798 | if (rw == WRITE && |
a5c308d4 | 3799 | logical_sector >= mddev->suspend_lo && |
e464eafd N |
3800 | logical_sector < mddev->suspend_hi) { |
3801 | release_stripe(sh); | |
e62e58a5 N |
3802 | /* As the suspend_* range is controlled by |
3803 | * userspace, we want an interruptible | |
3804 | * wait. | |
3805 | */ | |
3806 | flush_signals(current); | |
3807 | prepare_to_wait(&conf->wait_for_overlap, | |
3808 | &w, TASK_INTERRUPTIBLE); | |
3809 | if (logical_sector >= mddev->suspend_lo && | |
3810 | logical_sector < mddev->suspend_hi) | |
3811 | schedule(); | |
e464eafd N |
3812 | goto retry; |
3813 | } | |
7ecaa1e6 N |
3814 | |
3815 | if (test_bit(STRIPE_EXPANDING, &sh->state) || | |
ffd96e35 | 3816 | !add_stripe_bio(sh, bi, dd_idx, rw)) { |
7ecaa1e6 N |
3817 | /* Stripe is busy expanding or |
3818 | * add failed due to overlap. Flush everything | |
1da177e4 LT |
3819 | * and wait a while |
3820 | */ | |
482c0834 | 3821 | md_wakeup_thread(mddev->thread); |
1da177e4 LT |
3822 | release_stripe(sh); |
3823 | schedule(); | |
3824 | goto retry; | |
3825 | } | |
3826 | finish_wait(&conf->wait_for_overlap, &w); | |
6ed3003c N |
3827 | set_bit(STRIPE_HANDLE, &sh->state); |
3828 | clear_bit(STRIPE_DELAYED, &sh->state); | |
e9c7469b | 3829 | if ((bi->bi_rw & REQ_SYNC) && |
729a1866 N |
3830 | !test_and_set_bit(STRIPE_PREREAD_ACTIVE, &sh->state)) |
3831 | atomic_inc(&conf->preread_active_stripes); | |
1da177e4 | 3832 | release_stripe(sh); |
1da177e4 LT |
3833 | } else { |
3834 | /* cannot get stripe for read-ahead, just give-up */ | |
3835 | clear_bit(BIO_UPTODATE, &bi->bi_flags); | |
3836 | finish_wait(&conf->wait_for_overlap, &w); | |
3837 | break; | |
3838 | } | |
3839 | ||
3840 | } | |
7c13edc8 N |
3841 | if (!plugged) |
3842 | md_wakeup_thread(mddev->thread); | |
3843 | ||
1da177e4 | 3844 | spin_lock_irq(&conf->device_lock); |
960e739d | 3845 | remaining = raid5_dec_bi_phys_segments(bi); |
f6344757 N |
3846 | spin_unlock_irq(&conf->device_lock); |
3847 | if (remaining == 0) { | |
1da177e4 | 3848 | |
16a53ecc | 3849 | if ( rw == WRITE ) |
1da177e4 | 3850 | md_write_end(mddev); |
6712ecf8 | 3851 | |
0e13fe23 | 3852 | bio_endio(bi, 0); |
1da177e4 | 3853 | } |
729a1866 | 3854 | |
1da177e4 LT |
3855 | return 0; |
3856 | } | |
3857 | ||
b522adcd DW |
3858 | static sector_t raid5_size(mddev_t *mddev, sector_t sectors, int raid_disks); |
3859 | ||
52c03291 | 3860 | static sector_t reshape_request(mddev_t *mddev, sector_t sector_nr, int *skipped) |
1da177e4 | 3861 | { |
52c03291 N |
3862 | /* reshaping is quite different to recovery/resync so it is |
3863 | * handled quite separately ... here. | |
3864 | * | |
3865 | * On each call to sync_request, we gather one chunk worth of | |
3866 | * destination stripes and flag them as expanding. | |
3867 | * Then we find all the source stripes and request reads. | |
3868 | * As the reads complete, handle_stripe will copy the data | |
3869 | * into the destination stripe and release that stripe. | |
3870 | */ | |
7b92813c | 3871 | raid5_conf_t *conf = mddev->private; |
1da177e4 | 3872 | struct stripe_head *sh; |
ccfcc3c1 | 3873 | sector_t first_sector, last_sector; |
f416885e N |
3874 | int raid_disks = conf->previous_raid_disks; |
3875 | int data_disks = raid_disks - conf->max_degraded; | |
3876 | int new_data_disks = conf->raid_disks - conf->max_degraded; | |
52c03291 N |
3877 | int i; |
3878 | int dd_idx; | |
c8f517c4 | 3879 | sector_t writepos, readpos, safepos; |
ec32a2bd | 3880 | sector_t stripe_addr; |
7a661381 | 3881 | int reshape_sectors; |
ab69ae12 | 3882 | struct list_head stripes; |
52c03291 | 3883 | |
fef9c61f N |
3884 | if (sector_nr == 0) { |
3885 | /* If restarting in the middle, skip the initial sectors */ | |
3886 | if (mddev->delta_disks < 0 && | |
3887 | conf->reshape_progress < raid5_size(mddev, 0, 0)) { | |
3888 | sector_nr = raid5_size(mddev, 0, 0) | |
3889 | - conf->reshape_progress; | |
a639755c | 3890 | } else if (mddev->delta_disks >= 0 && |
fef9c61f N |
3891 | conf->reshape_progress > 0) |
3892 | sector_nr = conf->reshape_progress; | |
f416885e | 3893 | sector_div(sector_nr, new_data_disks); |
fef9c61f | 3894 | if (sector_nr) { |
8dee7211 N |
3895 | mddev->curr_resync_completed = sector_nr; |
3896 | sysfs_notify(&mddev->kobj, NULL, "sync_completed"); | |
fef9c61f N |
3897 | *skipped = 1; |
3898 | return sector_nr; | |
3899 | } | |
52c03291 N |
3900 | } |
3901 | ||
7a661381 N |
3902 | /* We need to process a full chunk at a time. |
3903 | * If old and new chunk sizes differ, we need to process the | |
3904 | * largest of these | |
3905 | */ | |
664e7c41 AN |
3906 | if (mddev->new_chunk_sectors > mddev->chunk_sectors) |
3907 | reshape_sectors = mddev->new_chunk_sectors; | |
7a661381 | 3908 | else |
9d8f0363 | 3909 | reshape_sectors = mddev->chunk_sectors; |
7a661381 | 3910 | |
52c03291 N |
3911 | /* we update the metadata when there is more than 3Meg |
3912 | * in the block range (that is rather arbitrary, should | |
3913 | * probably be time based) or when the data about to be | |
3914 | * copied would over-write the source of the data at | |
3915 | * the front of the range. | |
fef9c61f N |
3916 | * i.e. one new_stripe along from reshape_progress new_maps |
3917 | * to after where reshape_safe old_maps to | |
52c03291 | 3918 | */ |
fef9c61f | 3919 | writepos = conf->reshape_progress; |
f416885e | 3920 | sector_div(writepos, new_data_disks); |
c8f517c4 N |
3921 | readpos = conf->reshape_progress; |
3922 | sector_div(readpos, data_disks); | |
fef9c61f | 3923 | safepos = conf->reshape_safe; |
f416885e | 3924 | sector_div(safepos, data_disks); |
fef9c61f | 3925 | if (mddev->delta_disks < 0) { |
ed37d83e | 3926 | writepos -= min_t(sector_t, reshape_sectors, writepos); |
c8f517c4 | 3927 | readpos += reshape_sectors; |
7a661381 | 3928 | safepos += reshape_sectors; |
fef9c61f | 3929 | } else { |
7a661381 | 3930 | writepos += reshape_sectors; |
ed37d83e N |
3931 | readpos -= min_t(sector_t, reshape_sectors, readpos); |
3932 | safepos -= min_t(sector_t, reshape_sectors, safepos); | |
fef9c61f | 3933 | } |
52c03291 | 3934 | |
c8f517c4 N |
3935 | /* 'writepos' is the most advanced device address we might write. |
3936 | * 'readpos' is the least advanced device address we might read. | |
3937 | * 'safepos' is the least address recorded in the metadata as having | |
3938 | * been reshaped. | |
3939 | * If 'readpos' is behind 'writepos', then there is no way that we can | |
3940 | * ensure safety in the face of a crash - that must be done by userspace | |
3941 | * making a backup of the data. So in that case there is no particular | |
3942 | * rush to update metadata. | |
3943 | * Otherwise if 'safepos' is behind 'writepos', then we really need to | |
3944 | * update the metadata to advance 'safepos' to match 'readpos' so that | |
3945 | * we can be safe in the event of a crash. | |
3946 | * So we insist on updating metadata if safepos is behind writepos and | |
3947 | * readpos is beyond writepos. | |
3948 | * In any case, update the metadata every 10 seconds. | |
3949 | * Maybe that number should be configurable, but I'm not sure it is | |
3950 | * worth it.... maybe it could be a multiple of safemode_delay??? | |
3951 | */ | |
fef9c61f | 3952 | if ((mddev->delta_disks < 0 |
c8f517c4 N |
3953 | ? (safepos > writepos && readpos < writepos) |
3954 | : (safepos < writepos && readpos > writepos)) || | |
3955 | time_after(jiffies, conf->reshape_checkpoint + 10*HZ)) { | |
52c03291 N |
3956 | /* Cannot proceed until we've updated the superblock... */ |
3957 | wait_event(conf->wait_for_overlap, | |
3958 | atomic_read(&conf->reshape_stripes)==0); | |
fef9c61f | 3959 | mddev->reshape_position = conf->reshape_progress; |
75d3da43 | 3960 | mddev->curr_resync_completed = sector_nr; |
c8f517c4 | 3961 | conf->reshape_checkpoint = jiffies; |
850b2b42 | 3962 | set_bit(MD_CHANGE_DEVS, &mddev->flags); |
52c03291 | 3963 | md_wakeup_thread(mddev->thread); |
850b2b42 | 3964 | wait_event(mddev->sb_wait, mddev->flags == 0 || |
52c03291 N |
3965 | kthread_should_stop()); |
3966 | spin_lock_irq(&conf->device_lock); | |
fef9c61f | 3967 | conf->reshape_safe = mddev->reshape_position; |
52c03291 N |
3968 | spin_unlock_irq(&conf->device_lock); |
3969 | wake_up(&conf->wait_for_overlap); | |
acb180b0 | 3970 | sysfs_notify(&mddev->kobj, NULL, "sync_completed"); |
52c03291 N |
3971 | } |
3972 | ||
ec32a2bd N |
3973 | if (mddev->delta_disks < 0) { |
3974 | BUG_ON(conf->reshape_progress == 0); | |
3975 | stripe_addr = writepos; | |
3976 | BUG_ON((mddev->dev_sectors & | |
7a661381 N |
3977 | ~((sector_t)reshape_sectors - 1)) |
3978 | - reshape_sectors - stripe_addr | |
ec32a2bd N |
3979 | != sector_nr); |
3980 | } else { | |
7a661381 | 3981 | BUG_ON(writepos != sector_nr + reshape_sectors); |
ec32a2bd N |
3982 | stripe_addr = sector_nr; |
3983 | } | |
ab69ae12 | 3984 | INIT_LIST_HEAD(&stripes); |
7a661381 | 3985 | for (i = 0; i < reshape_sectors; i += STRIPE_SECTORS) { |
52c03291 | 3986 | int j; |
a9f326eb | 3987 | int skipped_disk = 0; |
a8c906ca | 3988 | sh = get_active_stripe(conf, stripe_addr+i, 0, 0, 1); |
52c03291 N |
3989 | set_bit(STRIPE_EXPANDING, &sh->state); |
3990 | atomic_inc(&conf->reshape_stripes); | |
3991 | /* If any of this stripe is beyond the end of the old | |
3992 | * array, then we need to zero those blocks | |
3993 | */ | |
3994 | for (j=sh->disks; j--;) { | |
3995 | sector_t s; | |
3996 | if (j == sh->pd_idx) | |
3997 | continue; | |
f416885e | 3998 | if (conf->level == 6 && |
d0dabf7e | 3999 | j == sh->qd_idx) |
f416885e | 4000 | continue; |
784052ec | 4001 | s = compute_blocknr(sh, j, 0); |
b522adcd | 4002 | if (s < raid5_size(mddev, 0, 0)) { |
a9f326eb | 4003 | skipped_disk = 1; |
52c03291 N |
4004 | continue; |
4005 | } | |
4006 | memset(page_address(sh->dev[j].page), 0, STRIPE_SIZE); | |
4007 | set_bit(R5_Expanded, &sh->dev[j].flags); | |
4008 | set_bit(R5_UPTODATE, &sh->dev[j].flags); | |
4009 | } | |
a9f326eb | 4010 | if (!skipped_disk) { |
52c03291 N |
4011 | set_bit(STRIPE_EXPAND_READY, &sh->state); |
4012 | set_bit(STRIPE_HANDLE, &sh->state); | |
4013 | } | |
ab69ae12 | 4014 | list_add(&sh->lru, &stripes); |
52c03291 N |
4015 | } |
4016 | spin_lock_irq(&conf->device_lock); | |
fef9c61f | 4017 | if (mddev->delta_disks < 0) |
7a661381 | 4018 | conf->reshape_progress -= reshape_sectors * new_data_disks; |
fef9c61f | 4019 | else |
7a661381 | 4020 | conf->reshape_progress += reshape_sectors * new_data_disks; |
52c03291 N |
4021 | spin_unlock_irq(&conf->device_lock); |
4022 | /* Ok, those stripe are ready. We can start scheduling | |
4023 | * reads on the source stripes. | |
4024 | * The source stripes are determined by mapping the first and last | |
4025 | * block on the destination stripes. | |
4026 | */ | |
52c03291 | 4027 | first_sector = |
ec32a2bd | 4028 | raid5_compute_sector(conf, stripe_addr*(new_data_disks), |
911d4ee8 | 4029 | 1, &dd_idx, NULL); |
52c03291 | 4030 | last_sector = |
0e6e0271 | 4031 | raid5_compute_sector(conf, ((stripe_addr+reshape_sectors) |
09c9e5fa | 4032 | * new_data_disks - 1), |
911d4ee8 | 4033 | 1, &dd_idx, NULL); |
58c0fed4 AN |
4034 | if (last_sector >= mddev->dev_sectors) |
4035 | last_sector = mddev->dev_sectors - 1; | |
52c03291 | 4036 | while (first_sector <= last_sector) { |
a8c906ca | 4037 | sh = get_active_stripe(conf, first_sector, 1, 0, 1); |
52c03291 N |
4038 | set_bit(STRIPE_EXPAND_SOURCE, &sh->state); |
4039 | set_bit(STRIPE_HANDLE, &sh->state); | |
4040 | release_stripe(sh); | |
4041 | first_sector += STRIPE_SECTORS; | |
4042 | } | |
ab69ae12 N |
4043 | /* Now that the sources are clearly marked, we can release |
4044 | * the destination stripes | |
4045 | */ | |
4046 | while (!list_empty(&stripes)) { | |
4047 | sh = list_entry(stripes.next, struct stripe_head, lru); | |
4048 | list_del_init(&sh->lru); | |
4049 | release_stripe(sh); | |
4050 | } | |
c6207277 N |
4051 | /* If this takes us to the resync_max point where we have to pause, |
4052 | * then we need to write out the superblock. | |
4053 | */ | |
7a661381 | 4054 | sector_nr += reshape_sectors; |
c03f6a19 N |
4055 | if ((sector_nr - mddev->curr_resync_completed) * 2 |
4056 | >= mddev->resync_max - mddev->curr_resync_completed) { | |
c6207277 N |
4057 | /* Cannot proceed until we've updated the superblock... */ |
4058 | wait_event(conf->wait_for_overlap, | |
4059 | atomic_read(&conf->reshape_stripes) == 0); | |
fef9c61f | 4060 | mddev->reshape_position = conf->reshape_progress; |
75d3da43 | 4061 | mddev->curr_resync_completed = sector_nr; |
c8f517c4 | 4062 | conf->reshape_checkpoint = jiffies; |
c6207277 N |
4063 | set_bit(MD_CHANGE_DEVS, &mddev->flags); |
4064 | md_wakeup_thread(mddev->thread); | |
4065 | wait_event(mddev->sb_wait, | |
4066 | !test_bit(MD_CHANGE_DEVS, &mddev->flags) | |
4067 | || kthread_should_stop()); | |
4068 | spin_lock_irq(&conf->device_lock); | |
fef9c61f | 4069 | conf->reshape_safe = mddev->reshape_position; |
c6207277 N |
4070 | spin_unlock_irq(&conf->device_lock); |
4071 | wake_up(&conf->wait_for_overlap); | |
acb180b0 | 4072 | sysfs_notify(&mddev->kobj, NULL, "sync_completed"); |
c6207277 | 4073 | } |
7a661381 | 4074 | return reshape_sectors; |
52c03291 N |
4075 | } |
4076 | ||
4077 | /* FIXME go_faster isn't used */ | |
4078 | static inline sector_t sync_request(mddev_t *mddev, sector_t sector_nr, int *skipped, int go_faster) | |
4079 | { | |
7b92813c | 4080 | raid5_conf_t *conf = mddev->private; |
52c03291 | 4081 | struct stripe_head *sh; |
58c0fed4 | 4082 | sector_t max_sector = mddev->dev_sectors; |
57dab0bd | 4083 | sector_t sync_blocks; |
16a53ecc N |
4084 | int still_degraded = 0; |
4085 | int i; | |
1da177e4 | 4086 | |
72626685 | 4087 | if (sector_nr >= max_sector) { |
1da177e4 | 4088 | /* just being told to finish up .. nothing much to do */ |
cea9c228 | 4089 | |
29269553 N |
4090 | if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)) { |
4091 | end_reshape(conf); | |
4092 | return 0; | |
4093 | } | |
72626685 N |
4094 | |
4095 | if (mddev->curr_resync < max_sector) /* aborted */ | |
4096 | bitmap_end_sync(mddev->bitmap, mddev->curr_resync, | |
4097 | &sync_blocks, 1); | |
16a53ecc | 4098 | else /* completed sync */ |
72626685 N |
4099 | conf->fullsync = 0; |
4100 | bitmap_close_sync(mddev->bitmap); | |
4101 | ||
1da177e4 LT |
4102 | return 0; |
4103 | } | |
ccfcc3c1 | 4104 | |
64bd660b N |
4105 | /* Allow raid5_quiesce to complete */ |
4106 | wait_event(conf->wait_for_overlap, conf->quiesce != 2); | |
4107 | ||
52c03291 N |
4108 | if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)) |
4109 | return reshape_request(mddev, sector_nr, skipped); | |
f6705578 | 4110 | |
c6207277 N |
4111 | /* No need to check resync_max as we never do more than one |
4112 | * stripe, and as resync_max will always be on a chunk boundary, | |
4113 | * if the check in md_do_sync didn't fire, there is no chance | |
4114 | * of overstepping resync_max here | |
4115 | */ | |
4116 | ||
16a53ecc | 4117 | /* if there is too many failed drives and we are trying |
1da177e4 LT |
4118 | * to resync, then assert that we are finished, because there is |
4119 | * nothing we can do. | |
4120 | */ | |
3285edf1 | 4121 | if (mddev->degraded >= conf->max_degraded && |
16a53ecc | 4122 | test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) { |
58c0fed4 | 4123 | sector_t rv = mddev->dev_sectors - sector_nr; |
57afd89f | 4124 | *skipped = 1; |
1da177e4 LT |
4125 | return rv; |
4126 | } | |
72626685 | 4127 | if (!bitmap_start_sync(mddev->bitmap, sector_nr, &sync_blocks, 1) && |
3855ad9f | 4128 | !test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery) && |
72626685 N |
4129 | !conf->fullsync && sync_blocks >= STRIPE_SECTORS) { |
4130 | /* we can skip this block, and probably more */ | |
4131 | sync_blocks /= STRIPE_SECTORS; | |
4132 | *skipped = 1; | |
4133 | return sync_blocks * STRIPE_SECTORS; /* keep things rounded to whole stripes */ | |
4134 | } | |
1da177e4 | 4135 | |
b47490c9 N |
4136 | |
4137 | bitmap_cond_end_sync(mddev->bitmap, sector_nr); | |
4138 | ||
a8c906ca | 4139 | sh = get_active_stripe(conf, sector_nr, 0, 1, 0); |
1da177e4 | 4140 | if (sh == NULL) { |
a8c906ca | 4141 | sh = get_active_stripe(conf, sector_nr, 0, 0, 0); |
1da177e4 | 4142 | /* make sure we don't swamp the stripe cache if someone else |
16a53ecc | 4143 | * is trying to get access |
1da177e4 | 4144 | */ |
66c006a5 | 4145 | schedule_timeout_uninterruptible(1); |
1da177e4 | 4146 | } |
16a53ecc N |
4147 | /* Need to check if array will still be degraded after recovery/resync |
4148 | * We don't need to check the 'failed' flag as when that gets set, | |
4149 | * recovery aborts. | |
4150 | */ | |
f001a70c | 4151 | for (i = 0; i < conf->raid_disks; i++) |
16a53ecc N |
4152 | if (conf->disks[i].rdev == NULL) |
4153 | still_degraded = 1; | |
4154 | ||
4155 | bitmap_start_sync(mddev->bitmap, sector_nr, &sync_blocks, still_degraded); | |
4156 | ||
83206d66 | 4157 | set_bit(STRIPE_SYNC_REQUESTED, &sh->state); |
1da177e4 | 4158 | |
1442577b | 4159 | handle_stripe(sh); |
1da177e4 LT |
4160 | release_stripe(sh); |
4161 | ||
4162 | return STRIPE_SECTORS; | |
4163 | } | |
4164 | ||
46031f9a RBJ |
4165 | static int retry_aligned_read(raid5_conf_t *conf, struct bio *raid_bio) |
4166 | { | |
4167 | /* We may not be able to submit a whole bio at once as there | |
4168 | * may not be enough stripe_heads available. | |
4169 | * We cannot pre-allocate enough stripe_heads as we may need | |
4170 | * more than exist in the cache (if we allow ever large chunks). | |
4171 | * So we do one stripe head at a time and record in | |
4172 | * ->bi_hw_segments how many have been done. | |
4173 | * | |
4174 | * We *know* that this entire raid_bio is in one chunk, so | |
4175 | * it will be only one 'dd_idx' and only need one call to raid5_compute_sector. | |
4176 | */ | |
4177 | struct stripe_head *sh; | |
911d4ee8 | 4178 | int dd_idx; |
46031f9a RBJ |
4179 | sector_t sector, logical_sector, last_sector; |
4180 | int scnt = 0; | |
4181 | int remaining; | |
4182 | int handled = 0; | |
4183 | ||
4184 | logical_sector = raid_bio->bi_sector & ~((sector_t)STRIPE_SECTORS-1); | |
112bf897 | 4185 | sector = raid5_compute_sector(conf, logical_sector, |
911d4ee8 | 4186 | 0, &dd_idx, NULL); |
46031f9a RBJ |
4187 | last_sector = raid_bio->bi_sector + (raid_bio->bi_size>>9); |
4188 | ||
4189 | for (; logical_sector < last_sector; | |
387bb173 NB |
4190 | logical_sector += STRIPE_SECTORS, |
4191 | sector += STRIPE_SECTORS, | |
4192 | scnt++) { | |
46031f9a | 4193 | |
960e739d | 4194 | if (scnt < raid5_bi_hw_segments(raid_bio)) |
46031f9a RBJ |
4195 | /* already done this stripe */ |
4196 | continue; | |
4197 | ||
a8c906ca | 4198 | sh = get_active_stripe(conf, sector, 0, 1, 0); |
46031f9a RBJ |
4199 | |
4200 | if (!sh) { | |
4201 | /* failed to get a stripe - must wait */ | |
960e739d | 4202 | raid5_set_bi_hw_segments(raid_bio, scnt); |
46031f9a RBJ |
4203 | conf->retry_read_aligned = raid_bio; |
4204 | return handled; | |
4205 | } | |
4206 | ||
4207 | set_bit(R5_ReadError, &sh->dev[dd_idx].flags); | |
387bb173 NB |
4208 | if (!add_stripe_bio(sh, raid_bio, dd_idx, 0)) { |
4209 | release_stripe(sh); | |
960e739d | 4210 | raid5_set_bi_hw_segments(raid_bio, scnt); |
387bb173 NB |
4211 | conf->retry_read_aligned = raid_bio; |
4212 | return handled; | |
4213 | } | |
4214 | ||
36d1c647 | 4215 | handle_stripe(sh); |
46031f9a RBJ |
4216 | release_stripe(sh); |
4217 | handled++; | |
4218 | } | |
4219 | spin_lock_irq(&conf->device_lock); | |
960e739d | 4220 | remaining = raid5_dec_bi_phys_segments(raid_bio); |
46031f9a | 4221 | spin_unlock_irq(&conf->device_lock); |
0e13fe23 NB |
4222 | if (remaining == 0) |
4223 | bio_endio(raid_bio, 0); | |
46031f9a RBJ |
4224 | if (atomic_dec_and_test(&conf->active_aligned_reads)) |
4225 | wake_up(&conf->wait_for_stripe); | |
4226 | return handled; | |
4227 | } | |
4228 | ||
46031f9a | 4229 | |
1da177e4 LT |
4230 | /* |
4231 | * This is our raid5 kernel thread. | |
4232 | * | |
4233 | * We scan the hash table for stripes which can be handled now. | |
4234 | * During the scan, completed stripes are saved for us by the interrupt | |
4235 | * handler, so that they will not have to wait for our next wakeup. | |
4236 | */ | |
6ed3003c | 4237 | static void raid5d(mddev_t *mddev) |
1da177e4 LT |
4238 | { |
4239 | struct stripe_head *sh; | |
070ec55d | 4240 | raid5_conf_t *conf = mddev->private; |
1da177e4 | 4241 | int handled; |
e1dfa0a2 | 4242 | struct blk_plug plug; |
1da177e4 | 4243 | |
45b4233c | 4244 | pr_debug("+++ raid5d active\n"); |
1da177e4 LT |
4245 | |
4246 | md_check_recovery(mddev); | |
1da177e4 | 4247 | |
e1dfa0a2 | 4248 | blk_start_plug(&plug); |
1da177e4 LT |
4249 | handled = 0; |
4250 | spin_lock_irq(&conf->device_lock); | |
4251 | while (1) { | |
46031f9a | 4252 | struct bio *bio; |
1da177e4 | 4253 | |
7c13edc8 N |
4254 | if (atomic_read(&mddev->plug_cnt) == 0 && |
4255 | !list_empty(&conf->bitmap_list)) { | |
4256 | /* Now is a good time to flush some bitmap updates */ | |
4257 | conf->seq_flush++; | |
700e432d | 4258 | spin_unlock_irq(&conf->device_lock); |
72626685 | 4259 | bitmap_unplug(mddev->bitmap); |
700e432d | 4260 | spin_lock_irq(&conf->device_lock); |
7c13edc8 | 4261 | conf->seq_write = conf->seq_flush; |
72626685 N |
4262 | activate_bit_delay(conf); |
4263 | } | |
7c13edc8 N |
4264 | if (atomic_read(&mddev->plug_cnt) == 0) |
4265 | raid5_activate_delayed(conf); | |
72626685 | 4266 | |
46031f9a RBJ |
4267 | while ((bio = remove_bio_from_retry(conf))) { |
4268 | int ok; | |
4269 | spin_unlock_irq(&conf->device_lock); | |
4270 | ok = retry_aligned_read(conf, bio); | |
4271 | spin_lock_irq(&conf->device_lock); | |
4272 | if (!ok) | |
4273 | break; | |
4274 | handled++; | |
4275 | } | |
4276 | ||
8b3e6cdc DW |
4277 | sh = __get_priority_stripe(conf); |
4278 | ||
c9f21aaf | 4279 | if (!sh) |
1da177e4 | 4280 | break; |
1da177e4 LT |
4281 | spin_unlock_irq(&conf->device_lock); |
4282 | ||
4283 | handled++; | |
417b8d4a DW |
4284 | handle_stripe(sh); |
4285 | release_stripe(sh); | |
4286 | cond_resched(); | |
1da177e4 | 4287 | |
de393cde N |
4288 | if (mddev->flags & ~(1<<MD_CHANGE_PENDING)) |
4289 | md_check_recovery(mddev); | |
4290 | ||
1da177e4 LT |
4291 | spin_lock_irq(&conf->device_lock); |
4292 | } | |
45b4233c | 4293 | pr_debug("%d stripes handled\n", handled); |
1da177e4 LT |
4294 | |
4295 | spin_unlock_irq(&conf->device_lock); | |
4296 | ||
c9f21aaf | 4297 | async_tx_issue_pending_all(); |
e1dfa0a2 | 4298 | blk_finish_plug(&plug); |
1da177e4 | 4299 | |
45b4233c | 4300 | pr_debug("--- raid5d inactive\n"); |
1da177e4 LT |
4301 | } |
4302 | ||
3f294f4f | 4303 | static ssize_t |
007583c9 | 4304 | raid5_show_stripe_cache_size(mddev_t *mddev, char *page) |
3f294f4f | 4305 | { |
070ec55d | 4306 | raid5_conf_t *conf = mddev->private; |
96de1e66 N |
4307 | if (conf) |
4308 | return sprintf(page, "%d\n", conf->max_nr_stripes); | |
4309 | else | |
4310 | return 0; | |
3f294f4f N |
4311 | } |
4312 | ||
c41d4ac4 N |
4313 | int |
4314 | raid5_set_cache_size(mddev_t *mddev, int size) | |
3f294f4f | 4315 | { |
070ec55d | 4316 | raid5_conf_t *conf = mddev->private; |
b5470dc5 DW |
4317 | int err; |
4318 | ||
c41d4ac4 | 4319 | if (size <= 16 || size > 32768) |
3f294f4f | 4320 | return -EINVAL; |
c41d4ac4 | 4321 | while (size < conf->max_nr_stripes) { |
3f294f4f N |
4322 | if (drop_one_stripe(conf)) |
4323 | conf->max_nr_stripes--; | |
4324 | else | |
4325 | break; | |
4326 | } | |
b5470dc5 DW |
4327 | err = md_allow_write(mddev); |
4328 | if (err) | |
4329 | return err; | |
c41d4ac4 | 4330 | while (size > conf->max_nr_stripes) { |
3f294f4f N |
4331 | if (grow_one_stripe(conf)) |
4332 | conf->max_nr_stripes++; | |
4333 | else break; | |
4334 | } | |
c41d4ac4 N |
4335 | return 0; |
4336 | } | |
4337 | EXPORT_SYMBOL(raid5_set_cache_size); | |
4338 | ||
4339 | static ssize_t | |
4340 | raid5_store_stripe_cache_size(mddev_t *mddev, const char *page, size_t len) | |
4341 | { | |
4342 | raid5_conf_t *conf = mddev->private; | |
4343 | unsigned long new; | |
4344 | int err; | |
4345 | ||
4346 | if (len >= PAGE_SIZE) | |
4347 | return -EINVAL; | |
4348 | if (!conf) | |
4349 | return -ENODEV; | |
4350 | ||
4351 | if (strict_strtoul(page, 10, &new)) | |
4352 | return -EINVAL; | |
4353 | err = raid5_set_cache_size(mddev, new); | |
4354 | if (err) | |
4355 | return err; | |
3f294f4f N |
4356 | return len; |
4357 | } | |
007583c9 | 4358 | |
96de1e66 N |
4359 | static struct md_sysfs_entry |
4360 | raid5_stripecache_size = __ATTR(stripe_cache_size, S_IRUGO | S_IWUSR, | |
4361 | raid5_show_stripe_cache_size, | |
4362 | raid5_store_stripe_cache_size); | |
3f294f4f | 4363 | |
8b3e6cdc DW |
4364 | static ssize_t |
4365 | raid5_show_preread_threshold(mddev_t *mddev, char *page) | |
4366 | { | |
070ec55d | 4367 | raid5_conf_t *conf = mddev->private; |
8b3e6cdc DW |
4368 | if (conf) |
4369 | return sprintf(page, "%d\n", conf->bypass_threshold); | |
4370 | else | |
4371 | return 0; | |
4372 | } | |
4373 | ||
4374 | static ssize_t | |
4375 | raid5_store_preread_threshold(mddev_t *mddev, const char *page, size_t len) | |
4376 | { | |
070ec55d | 4377 | raid5_conf_t *conf = mddev->private; |
4ef197d8 | 4378 | unsigned long new; |
8b3e6cdc DW |
4379 | if (len >= PAGE_SIZE) |
4380 | return -EINVAL; | |
4381 | if (!conf) | |
4382 | return -ENODEV; | |
4383 | ||
4ef197d8 | 4384 | if (strict_strtoul(page, 10, &new)) |
8b3e6cdc | 4385 | return -EINVAL; |
4ef197d8 | 4386 | if (new > conf->max_nr_stripes) |
8b3e6cdc DW |
4387 | return -EINVAL; |
4388 | conf->bypass_threshold = new; | |
4389 | return len; | |
4390 | } | |
4391 | ||
4392 | static struct md_sysfs_entry | |
4393 | raid5_preread_bypass_threshold = __ATTR(preread_bypass_threshold, | |
4394 | S_IRUGO | S_IWUSR, | |
4395 | raid5_show_preread_threshold, | |
4396 | raid5_store_preread_threshold); | |
4397 | ||
3f294f4f | 4398 | static ssize_t |
96de1e66 | 4399 | stripe_cache_active_show(mddev_t *mddev, char *page) |
3f294f4f | 4400 | { |
070ec55d | 4401 | raid5_conf_t *conf = mddev->private; |
96de1e66 N |
4402 | if (conf) |
4403 | return sprintf(page, "%d\n", atomic_read(&conf->active_stripes)); | |
4404 | else | |
4405 | return 0; | |
3f294f4f N |
4406 | } |
4407 | ||
96de1e66 N |
4408 | static struct md_sysfs_entry |
4409 | raid5_stripecache_active = __ATTR_RO(stripe_cache_active); | |
3f294f4f | 4410 | |
007583c9 | 4411 | static struct attribute *raid5_attrs[] = { |
3f294f4f N |
4412 | &raid5_stripecache_size.attr, |
4413 | &raid5_stripecache_active.attr, | |
8b3e6cdc | 4414 | &raid5_preread_bypass_threshold.attr, |
3f294f4f N |
4415 | NULL, |
4416 | }; | |
007583c9 N |
4417 | static struct attribute_group raid5_attrs_group = { |
4418 | .name = NULL, | |
4419 | .attrs = raid5_attrs, | |
3f294f4f N |
4420 | }; |
4421 | ||
80c3a6ce DW |
4422 | static sector_t |
4423 | raid5_size(mddev_t *mddev, sector_t sectors, int raid_disks) | |
4424 | { | |
070ec55d | 4425 | raid5_conf_t *conf = mddev->private; |
80c3a6ce DW |
4426 | |
4427 | if (!sectors) | |
4428 | sectors = mddev->dev_sectors; | |
5e5e3e78 | 4429 | if (!raid_disks) |
7ec05478 | 4430 | /* size is defined by the smallest of previous and new size */ |
5e5e3e78 | 4431 | raid_disks = min(conf->raid_disks, conf->previous_raid_disks); |
80c3a6ce | 4432 | |
9d8f0363 | 4433 | sectors &= ~((sector_t)mddev->chunk_sectors - 1); |
664e7c41 | 4434 | sectors &= ~((sector_t)mddev->new_chunk_sectors - 1); |
80c3a6ce DW |
4435 | return sectors * (raid_disks - conf->max_degraded); |
4436 | } | |
4437 | ||
36d1c647 DW |
4438 | static void raid5_free_percpu(raid5_conf_t *conf) |
4439 | { | |
4440 | struct raid5_percpu *percpu; | |
4441 | unsigned long cpu; | |
4442 | ||
4443 | if (!conf->percpu) | |
4444 | return; | |
4445 | ||
4446 | get_online_cpus(); | |
4447 | for_each_possible_cpu(cpu) { | |
4448 | percpu = per_cpu_ptr(conf->percpu, cpu); | |
4449 | safe_put_page(percpu->spare_page); | |
d6f38f31 | 4450 | kfree(percpu->scribble); |
36d1c647 DW |
4451 | } |
4452 | #ifdef CONFIG_HOTPLUG_CPU | |
4453 | unregister_cpu_notifier(&conf->cpu_notify); | |
4454 | #endif | |
4455 | put_online_cpus(); | |
4456 | ||
4457 | free_percpu(conf->percpu); | |
4458 | } | |
4459 | ||
95fc17aa DW |
4460 | static void free_conf(raid5_conf_t *conf) |
4461 | { | |
4462 | shrink_stripes(conf); | |
36d1c647 | 4463 | raid5_free_percpu(conf); |
95fc17aa DW |
4464 | kfree(conf->disks); |
4465 | kfree(conf->stripe_hashtbl); | |
4466 | kfree(conf); | |
4467 | } | |
4468 | ||
36d1c647 DW |
4469 | #ifdef CONFIG_HOTPLUG_CPU |
4470 | static int raid456_cpu_notify(struct notifier_block *nfb, unsigned long action, | |
4471 | void *hcpu) | |
4472 | { | |
4473 | raid5_conf_t *conf = container_of(nfb, raid5_conf_t, cpu_notify); | |
4474 | long cpu = (long)hcpu; | |
4475 | struct raid5_percpu *percpu = per_cpu_ptr(conf->percpu, cpu); | |
4476 | ||
4477 | switch (action) { | |
4478 | case CPU_UP_PREPARE: | |
4479 | case CPU_UP_PREPARE_FROZEN: | |
d6f38f31 | 4480 | if (conf->level == 6 && !percpu->spare_page) |
36d1c647 | 4481 | percpu->spare_page = alloc_page(GFP_KERNEL); |
d6f38f31 DW |
4482 | if (!percpu->scribble) |
4483 | percpu->scribble = kmalloc(conf->scribble_len, GFP_KERNEL); | |
4484 | ||
4485 | if (!percpu->scribble || | |
4486 | (conf->level == 6 && !percpu->spare_page)) { | |
4487 | safe_put_page(percpu->spare_page); | |
4488 | kfree(percpu->scribble); | |
36d1c647 DW |
4489 | pr_err("%s: failed memory allocation for cpu%ld\n", |
4490 | __func__, cpu); | |
55af6bb5 | 4491 | return notifier_from_errno(-ENOMEM); |
36d1c647 DW |
4492 | } |
4493 | break; | |
4494 | case CPU_DEAD: | |
4495 | case CPU_DEAD_FROZEN: | |
4496 | safe_put_page(percpu->spare_page); | |
d6f38f31 | 4497 | kfree(percpu->scribble); |
36d1c647 | 4498 | percpu->spare_page = NULL; |
d6f38f31 | 4499 | percpu->scribble = NULL; |
36d1c647 DW |
4500 | break; |
4501 | default: | |
4502 | break; | |
4503 | } | |
4504 | return NOTIFY_OK; | |
4505 | } | |
4506 | #endif | |
4507 | ||
4508 | static int raid5_alloc_percpu(raid5_conf_t *conf) | |
4509 | { | |
4510 | unsigned long cpu; | |
4511 | struct page *spare_page; | |
a29d8b8e | 4512 | struct raid5_percpu __percpu *allcpus; |
d6f38f31 | 4513 | void *scribble; |
36d1c647 DW |
4514 | int err; |
4515 | ||
36d1c647 DW |
4516 | allcpus = alloc_percpu(struct raid5_percpu); |
4517 | if (!allcpus) | |
4518 | return -ENOMEM; | |
4519 | conf->percpu = allcpus; | |
4520 | ||
4521 | get_online_cpus(); | |
4522 | err = 0; | |
4523 | for_each_present_cpu(cpu) { | |
d6f38f31 DW |
4524 | if (conf->level == 6) { |
4525 | spare_page = alloc_page(GFP_KERNEL); | |
4526 | if (!spare_page) { | |
4527 | err = -ENOMEM; | |
4528 | break; | |
4529 | } | |
4530 | per_cpu_ptr(conf->percpu, cpu)->spare_page = spare_page; | |
4531 | } | |
5e5e3e78 | 4532 | scribble = kmalloc(conf->scribble_len, GFP_KERNEL); |
d6f38f31 | 4533 | if (!scribble) { |
36d1c647 DW |
4534 | err = -ENOMEM; |
4535 | break; | |
4536 | } | |
d6f38f31 | 4537 | per_cpu_ptr(conf->percpu, cpu)->scribble = scribble; |
36d1c647 DW |
4538 | } |
4539 | #ifdef CONFIG_HOTPLUG_CPU | |
4540 | conf->cpu_notify.notifier_call = raid456_cpu_notify; | |
4541 | conf->cpu_notify.priority = 0; | |
4542 | if (err == 0) | |
4543 | err = register_cpu_notifier(&conf->cpu_notify); | |
4544 | #endif | |
4545 | put_online_cpus(); | |
4546 | ||
4547 | return err; | |
4548 | } | |
4549 | ||
91adb564 | 4550 | static raid5_conf_t *setup_conf(mddev_t *mddev) |
1da177e4 LT |
4551 | { |
4552 | raid5_conf_t *conf; | |
5e5e3e78 | 4553 | int raid_disk, memory, max_disks; |
1da177e4 LT |
4554 | mdk_rdev_t *rdev; |
4555 | struct disk_info *disk; | |
1da177e4 | 4556 | |
91adb564 N |
4557 | if (mddev->new_level != 5 |
4558 | && mddev->new_level != 4 | |
4559 | && mddev->new_level != 6) { | |
0c55e022 | 4560 | printk(KERN_ERR "md/raid:%s: raid level not set to 4/5/6 (%d)\n", |
91adb564 N |
4561 | mdname(mddev), mddev->new_level); |
4562 | return ERR_PTR(-EIO); | |
1da177e4 | 4563 | } |
91adb564 N |
4564 | if ((mddev->new_level == 5 |
4565 | && !algorithm_valid_raid5(mddev->new_layout)) || | |
4566 | (mddev->new_level == 6 | |
4567 | && !algorithm_valid_raid6(mddev->new_layout))) { | |
0c55e022 | 4568 | printk(KERN_ERR "md/raid:%s: layout %d not supported\n", |
91adb564 N |
4569 | mdname(mddev), mddev->new_layout); |
4570 | return ERR_PTR(-EIO); | |
99c0fb5f | 4571 | } |
91adb564 | 4572 | if (mddev->new_level == 6 && mddev->raid_disks < 4) { |
0c55e022 | 4573 | printk(KERN_ERR "md/raid:%s: not enough configured devices (%d, minimum 4)\n", |
91adb564 N |
4574 | mdname(mddev), mddev->raid_disks); |
4575 | return ERR_PTR(-EINVAL); | |
4bbf3771 N |
4576 | } |
4577 | ||
664e7c41 AN |
4578 | if (!mddev->new_chunk_sectors || |
4579 | (mddev->new_chunk_sectors << 9) % PAGE_SIZE || | |
4580 | !is_power_of_2(mddev->new_chunk_sectors)) { | |
0c55e022 N |
4581 | printk(KERN_ERR "md/raid:%s: invalid chunk size %d\n", |
4582 | mdname(mddev), mddev->new_chunk_sectors << 9); | |
91adb564 | 4583 | return ERR_PTR(-EINVAL); |
f6705578 N |
4584 | } |
4585 | ||
91adb564 N |
4586 | conf = kzalloc(sizeof(raid5_conf_t), GFP_KERNEL); |
4587 | if (conf == NULL) | |
1da177e4 | 4588 | goto abort; |
f5efd45a DW |
4589 | spin_lock_init(&conf->device_lock); |
4590 | init_waitqueue_head(&conf->wait_for_stripe); | |
4591 | init_waitqueue_head(&conf->wait_for_overlap); | |
4592 | INIT_LIST_HEAD(&conf->handle_list); | |
4593 | INIT_LIST_HEAD(&conf->hold_list); | |
4594 | INIT_LIST_HEAD(&conf->delayed_list); | |
4595 | INIT_LIST_HEAD(&conf->bitmap_list); | |
4596 | INIT_LIST_HEAD(&conf->inactive_list); | |
4597 | atomic_set(&conf->active_stripes, 0); | |
4598 | atomic_set(&conf->preread_active_stripes, 0); | |
4599 | atomic_set(&conf->active_aligned_reads, 0); | |
4600 | conf->bypass_threshold = BYPASS_THRESHOLD; | |
91adb564 N |
4601 | |
4602 | conf->raid_disks = mddev->raid_disks; | |
4603 | if (mddev->reshape_position == MaxSector) | |
4604 | conf->previous_raid_disks = mddev->raid_disks; | |
4605 | else | |
f6705578 | 4606 | conf->previous_raid_disks = mddev->raid_disks - mddev->delta_disks; |
5e5e3e78 N |
4607 | max_disks = max(conf->raid_disks, conf->previous_raid_disks); |
4608 | conf->scribble_len = scribble_len(max_disks); | |
f6705578 | 4609 | |
5e5e3e78 | 4610 | conf->disks = kzalloc(max_disks * sizeof(struct disk_info), |
b55e6bfc N |
4611 | GFP_KERNEL); |
4612 | if (!conf->disks) | |
4613 | goto abort; | |
9ffae0cf | 4614 | |
1da177e4 LT |
4615 | conf->mddev = mddev; |
4616 | ||
fccddba0 | 4617 | if ((conf->stripe_hashtbl = kzalloc(PAGE_SIZE, GFP_KERNEL)) == NULL) |
1da177e4 | 4618 | goto abort; |
1da177e4 | 4619 | |
36d1c647 DW |
4620 | conf->level = mddev->new_level; |
4621 | if (raid5_alloc_percpu(conf) != 0) | |
4622 | goto abort; | |
4623 | ||
0c55e022 | 4624 | pr_debug("raid456: run(%s) called.\n", mdname(mddev)); |
1da177e4 | 4625 | |
159ec1fc | 4626 | list_for_each_entry(rdev, &mddev->disks, same_set) { |
1da177e4 | 4627 | raid_disk = rdev->raid_disk; |
5e5e3e78 | 4628 | if (raid_disk >= max_disks |
1da177e4 LT |
4629 | || raid_disk < 0) |
4630 | continue; | |
4631 | disk = conf->disks + raid_disk; | |
4632 | ||
4633 | disk->rdev = rdev; | |
4634 | ||
b2d444d7 | 4635 | if (test_bit(In_sync, &rdev->flags)) { |
1da177e4 | 4636 | char b[BDEVNAME_SIZE]; |
0c55e022 N |
4637 | printk(KERN_INFO "md/raid:%s: device %s operational as raid" |
4638 | " disk %d\n", | |
4639 | mdname(mddev), bdevname(rdev->bdev, b), raid_disk); | |
d6b212f4 | 4640 | } else if (rdev->saved_raid_disk != raid_disk) |
8c2e870a NB |
4641 | /* Cannot rely on bitmap to complete recovery */ |
4642 | conf->fullsync = 1; | |
1da177e4 LT |
4643 | } |
4644 | ||
09c9e5fa | 4645 | conf->chunk_sectors = mddev->new_chunk_sectors; |
91adb564 | 4646 | conf->level = mddev->new_level; |
16a53ecc N |
4647 | if (conf->level == 6) |
4648 | conf->max_degraded = 2; | |
4649 | else | |
4650 | conf->max_degraded = 1; | |
91adb564 | 4651 | conf->algorithm = mddev->new_layout; |
1da177e4 | 4652 | conf->max_nr_stripes = NR_STRIPES; |
fef9c61f | 4653 | conf->reshape_progress = mddev->reshape_position; |
e183eaed | 4654 | if (conf->reshape_progress != MaxSector) { |
09c9e5fa | 4655 | conf->prev_chunk_sectors = mddev->chunk_sectors; |
e183eaed N |
4656 | conf->prev_algo = mddev->layout; |
4657 | } | |
1da177e4 | 4658 | |
91adb564 | 4659 | memory = conf->max_nr_stripes * (sizeof(struct stripe_head) + |
5e5e3e78 | 4660 | max_disks * ((sizeof(struct bio) + PAGE_SIZE))) / 1024; |
91adb564 N |
4661 | if (grow_stripes(conf, conf->max_nr_stripes)) { |
4662 | printk(KERN_ERR | |
0c55e022 N |
4663 | "md/raid:%s: couldn't allocate %dkB for buffers\n", |
4664 | mdname(mddev), memory); | |
91adb564 N |
4665 | goto abort; |
4666 | } else | |
0c55e022 N |
4667 | printk(KERN_INFO "md/raid:%s: allocated %dkB\n", |
4668 | mdname(mddev), memory); | |
1da177e4 | 4669 | |
0da3c619 | 4670 | conf->thread = md_register_thread(raid5d, mddev, NULL); |
91adb564 N |
4671 | if (!conf->thread) { |
4672 | printk(KERN_ERR | |
0c55e022 | 4673 | "md/raid:%s: couldn't allocate thread.\n", |
91adb564 | 4674 | mdname(mddev)); |
16a53ecc N |
4675 | goto abort; |
4676 | } | |
91adb564 N |
4677 | |
4678 | return conf; | |
4679 | ||
4680 | abort: | |
4681 | if (conf) { | |
95fc17aa | 4682 | free_conf(conf); |
91adb564 N |
4683 | return ERR_PTR(-EIO); |
4684 | } else | |
4685 | return ERR_PTR(-ENOMEM); | |
4686 | } | |
4687 | ||
c148ffdc N |
4688 | |
4689 | static int only_parity(int raid_disk, int algo, int raid_disks, int max_degraded) | |
4690 | { | |
4691 | switch (algo) { | |
4692 | case ALGORITHM_PARITY_0: | |
4693 | if (raid_disk < max_degraded) | |
4694 | return 1; | |
4695 | break; | |
4696 | case ALGORITHM_PARITY_N: | |
4697 | if (raid_disk >= raid_disks - max_degraded) | |
4698 | return 1; | |
4699 | break; | |
4700 | case ALGORITHM_PARITY_0_6: | |
4701 | if (raid_disk == 0 || | |
4702 | raid_disk == raid_disks - 1) | |
4703 | return 1; | |
4704 | break; | |
4705 | case ALGORITHM_LEFT_ASYMMETRIC_6: | |
4706 | case ALGORITHM_RIGHT_ASYMMETRIC_6: | |
4707 | case ALGORITHM_LEFT_SYMMETRIC_6: | |
4708 | case ALGORITHM_RIGHT_SYMMETRIC_6: | |
4709 | if (raid_disk == raid_disks - 1) | |
4710 | return 1; | |
4711 | } | |
4712 | return 0; | |
4713 | } | |
4714 | ||
91adb564 N |
4715 | static int run(mddev_t *mddev) |
4716 | { | |
4717 | raid5_conf_t *conf; | |
9f7c2220 | 4718 | int working_disks = 0; |
c148ffdc | 4719 | int dirty_parity_disks = 0; |
91adb564 | 4720 | mdk_rdev_t *rdev; |
c148ffdc | 4721 | sector_t reshape_offset = 0; |
91adb564 | 4722 | |
8c6ac868 | 4723 | if (mddev->recovery_cp != MaxSector) |
0c55e022 | 4724 | printk(KERN_NOTICE "md/raid:%s: not clean" |
8c6ac868 AN |
4725 | " -- starting background reconstruction\n", |
4726 | mdname(mddev)); | |
91adb564 N |
4727 | if (mddev->reshape_position != MaxSector) { |
4728 | /* Check that we can continue the reshape. | |
4729 | * Currently only disks can change, it must | |
4730 | * increase, and we must be past the point where | |
4731 | * a stripe over-writes itself | |
4732 | */ | |
4733 | sector_t here_new, here_old; | |
4734 | int old_disks; | |
18b00334 | 4735 | int max_degraded = (mddev->level == 6 ? 2 : 1); |
91adb564 | 4736 | |
88ce4930 | 4737 | if (mddev->new_level != mddev->level) { |
0c55e022 | 4738 | printk(KERN_ERR "md/raid:%s: unsupported reshape " |
91adb564 N |
4739 | "required - aborting.\n", |
4740 | mdname(mddev)); | |
4741 | return -EINVAL; | |
4742 | } | |
91adb564 N |
4743 | old_disks = mddev->raid_disks - mddev->delta_disks; |
4744 | /* reshape_position must be on a new-stripe boundary, and one | |
4745 | * further up in new geometry must map after here in old | |
4746 | * geometry. | |
4747 | */ | |
4748 | here_new = mddev->reshape_position; | |
664e7c41 | 4749 | if (sector_div(here_new, mddev->new_chunk_sectors * |
91adb564 | 4750 | (mddev->raid_disks - max_degraded))) { |
0c55e022 N |
4751 | printk(KERN_ERR "md/raid:%s: reshape_position not " |
4752 | "on a stripe boundary\n", mdname(mddev)); | |
91adb564 N |
4753 | return -EINVAL; |
4754 | } | |
c148ffdc | 4755 | reshape_offset = here_new * mddev->new_chunk_sectors; |
91adb564 N |
4756 | /* here_new is the stripe we will write to */ |
4757 | here_old = mddev->reshape_position; | |
9d8f0363 | 4758 | sector_div(here_old, mddev->chunk_sectors * |
91adb564 N |
4759 | (old_disks-max_degraded)); |
4760 | /* here_old is the first stripe that we might need to read | |
4761 | * from */ | |
67ac6011 N |
4762 | if (mddev->delta_disks == 0) { |
4763 | /* We cannot be sure it is safe to start an in-place | |
4764 | * reshape. It is only safe if user-space if monitoring | |
4765 | * and taking constant backups. | |
4766 | * mdadm always starts a situation like this in | |
4767 | * readonly mode so it can take control before | |
4768 | * allowing any writes. So just check for that. | |
4769 | */ | |
4770 | if ((here_new * mddev->new_chunk_sectors != | |
4771 | here_old * mddev->chunk_sectors) || | |
4772 | mddev->ro == 0) { | |
0c55e022 N |
4773 | printk(KERN_ERR "md/raid:%s: in-place reshape must be started" |
4774 | " in read-only mode - aborting\n", | |
4775 | mdname(mddev)); | |
67ac6011 N |
4776 | return -EINVAL; |
4777 | } | |
4778 | } else if (mddev->delta_disks < 0 | |
4779 | ? (here_new * mddev->new_chunk_sectors <= | |
4780 | here_old * mddev->chunk_sectors) | |
4781 | : (here_new * mddev->new_chunk_sectors >= | |
4782 | here_old * mddev->chunk_sectors)) { | |
91adb564 | 4783 | /* Reading from the same stripe as writing to - bad */ |
0c55e022 N |
4784 | printk(KERN_ERR "md/raid:%s: reshape_position too early for " |
4785 | "auto-recovery - aborting.\n", | |
4786 | mdname(mddev)); | |
91adb564 N |
4787 | return -EINVAL; |
4788 | } | |
0c55e022 N |
4789 | printk(KERN_INFO "md/raid:%s: reshape will continue\n", |
4790 | mdname(mddev)); | |
91adb564 N |
4791 | /* OK, we should be able to continue; */ |
4792 | } else { | |
4793 | BUG_ON(mddev->level != mddev->new_level); | |
4794 | BUG_ON(mddev->layout != mddev->new_layout); | |
664e7c41 | 4795 | BUG_ON(mddev->chunk_sectors != mddev->new_chunk_sectors); |
91adb564 | 4796 | BUG_ON(mddev->delta_disks != 0); |
1da177e4 | 4797 | } |
91adb564 | 4798 | |
245f46c2 N |
4799 | if (mddev->private == NULL) |
4800 | conf = setup_conf(mddev); | |
4801 | else | |
4802 | conf = mddev->private; | |
4803 | ||
91adb564 N |
4804 | if (IS_ERR(conf)) |
4805 | return PTR_ERR(conf); | |
4806 | ||
4807 | mddev->thread = conf->thread; | |
4808 | conf->thread = NULL; | |
4809 | mddev->private = conf; | |
4810 | ||
4811 | /* | |
4812 | * 0 for a fully functional array, 1 or 2 for a degraded array. | |
4813 | */ | |
c148ffdc N |
4814 | list_for_each_entry(rdev, &mddev->disks, same_set) { |
4815 | if (rdev->raid_disk < 0) | |
4816 | continue; | |
2f115882 | 4817 | if (test_bit(In_sync, &rdev->flags)) { |
91adb564 | 4818 | working_disks++; |
2f115882 N |
4819 | continue; |
4820 | } | |
c148ffdc N |
4821 | /* This disc is not fully in-sync. However if it |
4822 | * just stored parity (beyond the recovery_offset), | |
4823 | * when we don't need to be concerned about the | |
4824 | * array being dirty. | |
4825 | * When reshape goes 'backwards', we never have | |
4826 | * partially completed devices, so we only need | |
4827 | * to worry about reshape going forwards. | |
4828 | */ | |
4829 | /* Hack because v0.91 doesn't store recovery_offset properly. */ | |
4830 | if (mddev->major_version == 0 && | |
4831 | mddev->minor_version > 90) | |
4832 | rdev->recovery_offset = reshape_offset; | |
4833 | ||
c148ffdc N |
4834 | if (rdev->recovery_offset < reshape_offset) { |
4835 | /* We need to check old and new layout */ | |
4836 | if (!only_parity(rdev->raid_disk, | |
4837 | conf->algorithm, | |
4838 | conf->raid_disks, | |
4839 | conf->max_degraded)) | |
4840 | continue; | |
4841 | } | |
4842 | if (!only_parity(rdev->raid_disk, | |
4843 | conf->prev_algo, | |
4844 | conf->previous_raid_disks, | |
4845 | conf->max_degraded)) | |
4846 | continue; | |
4847 | dirty_parity_disks++; | |
4848 | } | |
91adb564 | 4849 | |
5e5e3e78 N |
4850 | mddev->degraded = (max(conf->raid_disks, conf->previous_raid_disks) |
4851 | - working_disks); | |
91adb564 | 4852 | |
674806d6 | 4853 | if (has_failed(conf)) { |
0c55e022 | 4854 | printk(KERN_ERR "md/raid:%s: not enough operational devices" |
1da177e4 | 4855 | " (%d/%d failed)\n", |
02c2de8c | 4856 | mdname(mddev), mddev->degraded, conf->raid_disks); |
1da177e4 LT |
4857 | goto abort; |
4858 | } | |
4859 | ||
91adb564 | 4860 | /* device size must be a multiple of chunk size */ |
9d8f0363 | 4861 | mddev->dev_sectors &= ~(mddev->chunk_sectors - 1); |
91adb564 N |
4862 | mddev->resync_max_sectors = mddev->dev_sectors; |
4863 | ||
c148ffdc | 4864 | if (mddev->degraded > dirty_parity_disks && |
1da177e4 | 4865 | mddev->recovery_cp != MaxSector) { |
6ff8d8ec N |
4866 | if (mddev->ok_start_degraded) |
4867 | printk(KERN_WARNING | |
0c55e022 N |
4868 | "md/raid:%s: starting dirty degraded array" |
4869 | " - data corruption possible.\n", | |
6ff8d8ec N |
4870 | mdname(mddev)); |
4871 | else { | |
4872 | printk(KERN_ERR | |
0c55e022 | 4873 | "md/raid:%s: cannot start dirty degraded array.\n", |
6ff8d8ec N |
4874 | mdname(mddev)); |
4875 | goto abort; | |
4876 | } | |
1da177e4 LT |
4877 | } |
4878 | ||
1da177e4 | 4879 | if (mddev->degraded == 0) |
0c55e022 N |
4880 | printk(KERN_INFO "md/raid:%s: raid level %d active with %d out of %d" |
4881 | " devices, algorithm %d\n", mdname(mddev), conf->level, | |
e183eaed N |
4882 | mddev->raid_disks-mddev->degraded, mddev->raid_disks, |
4883 | mddev->new_layout); | |
1da177e4 | 4884 | else |
0c55e022 N |
4885 | printk(KERN_ALERT "md/raid:%s: raid level %d active with %d" |
4886 | " out of %d devices, algorithm %d\n", | |
4887 | mdname(mddev), conf->level, | |
4888 | mddev->raid_disks - mddev->degraded, | |
4889 | mddev->raid_disks, mddev->new_layout); | |
1da177e4 LT |
4890 | |
4891 | print_raid5_conf(conf); | |
4892 | ||
fef9c61f | 4893 | if (conf->reshape_progress != MaxSector) { |
fef9c61f | 4894 | conf->reshape_safe = conf->reshape_progress; |
f6705578 N |
4895 | atomic_set(&conf->reshape_stripes, 0); |
4896 | clear_bit(MD_RECOVERY_SYNC, &mddev->recovery); | |
4897 | clear_bit(MD_RECOVERY_CHECK, &mddev->recovery); | |
4898 | set_bit(MD_RECOVERY_RESHAPE, &mddev->recovery); | |
4899 | set_bit(MD_RECOVERY_RUNNING, &mddev->recovery); | |
4900 | mddev->sync_thread = md_register_thread(md_do_sync, mddev, | |
0da3c619 | 4901 | "reshape"); |
f6705578 N |
4902 | } |
4903 | ||
1da177e4 LT |
4904 | |
4905 | /* Ok, everything is just fine now */ | |
a64c876f N |
4906 | if (mddev->to_remove == &raid5_attrs_group) |
4907 | mddev->to_remove = NULL; | |
00bcb4ac N |
4908 | else if (mddev->kobj.sd && |
4909 | sysfs_create_group(&mddev->kobj, &raid5_attrs_group)) | |
5e55e2f5 | 4910 | printk(KERN_WARNING |
4a5add49 | 4911 | "raid5: failed to create sysfs attributes for %s\n", |
5e55e2f5 | 4912 | mdname(mddev)); |
4a5add49 | 4913 | md_set_array_sectors(mddev, raid5_size(mddev, 0, 0)); |
7a5febe9 | 4914 | |
4a5add49 | 4915 | if (mddev->queue) { |
9f7c2220 | 4916 | int chunk_size; |
4a5add49 N |
4917 | /* read-ahead size must cover two whole stripes, which |
4918 | * is 2 * (datadisks) * chunksize where 'n' is the | |
4919 | * number of raid devices | |
4920 | */ | |
4921 | int data_disks = conf->previous_raid_disks - conf->max_degraded; | |
4922 | int stripe = data_disks * | |
4923 | ((mddev->chunk_sectors << 9) / PAGE_SIZE); | |
4924 | if (mddev->queue->backing_dev_info.ra_pages < 2 * stripe) | |
4925 | mddev->queue->backing_dev_info.ra_pages = 2 * stripe; | |
91adb564 | 4926 | |
4a5add49 | 4927 | blk_queue_merge_bvec(mddev->queue, raid5_mergeable_bvec); |
f022b2fd | 4928 | |
11d8a6e3 N |
4929 | mddev->queue->backing_dev_info.congested_data = mddev; |
4930 | mddev->queue->backing_dev_info.congested_fn = raid5_congested; | |
7a5febe9 | 4931 | |
9f7c2220 N |
4932 | chunk_size = mddev->chunk_sectors << 9; |
4933 | blk_queue_io_min(mddev->queue, chunk_size); | |
4934 | blk_queue_io_opt(mddev->queue, chunk_size * | |
4935 | (conf->raid_disks - conf->max_degraded)); | |
8f6c2e4b | 4936 | |
9f7c2220 N |
4937 | list_for_each_entry(rdev, &mddev->disks, same_set) |
4938 | disk_stack_limits(mddev->gendisk, rdev->bdev, | |
4939 | rdev->data_offset << 9); | |
4940 | } | |
23032a0e | 4941 | |
1da177e4 LT |
4942 | return 0; |
4943 | abort: | |
e0cf8f04 | 4944 | md_unregister_thread(mddev->thread); |
91adb564 | 4945 | mddev->thread = NULL; |
1da177e4 LT |
4946 | if (conf) { |
4947 | print_raid5_conf(conf); | |
95fc17aa | 4948 | free_conf(conf); |
1da177e4 LT |
4949 | } |
4950 | mddev->private = NULL; | |
0c55e022 | 4951 | printk(KERN_ALERT "md/raid:%s: failed to run raid set.\n", mdname(mddev)); |
1da177e4 LT |
4952 | return -EIO; |
4953 | } | |
4954 | ||
3f294f4f | 4955 | static int stop(mddev_t *mddev) |
1da177e4 | 4956 | { |
7b92813c | 4957 | raid5_conf_t *conf = mddev->private; |
1da177e4 LT |
4958 | |
4959 | md_unregister_thread(mddev->thread); | |
4960 | mddev->thread = NULL; | |
11d8a6e3 N |
4961 | if (mddev->queue) |
4962 | mddev->queue->backing_dev_info.congested_fn = NULL; | |
95fc17aa | 4963 | free_conf(conf); |
a64c876f N |
4964 | mddev->private = NULL; |
4965 | mddev->to_remove = &raid5_attrs_group; | |
1da177e4 LT |
4966 | return 0; |
4967 | } | |
4968 | ||
45b4233c | 4969 | #ifdef DEBUG |
d710e138 | 4970 | static void print_sh(struct seq_file *seq, struct stripe_head *sh) |
1da177e4 LT |
4971 | { |
4972 | int i; | |
4973 | ||
16a53ecc N |
4974 | seq_printf(seq, "sh %llu, pd_idx %d, state %ld.\n", |
4975 | (unsigned long long)sh->sector, sh->pd_idx, sh->state); | |
4976 | seq_printf(seq, "sh %llu, count %d.\n", | |
4977 | (unsigned long long)sh->sector, atomic_read(&sh->count)); | |
4978 | seq_printf(seq, "sh %llu, ", (unsigned long long)sh->sector); | |
7ecaa1e6 | 4979 | for (i = 0; i < sh->disks; i++) { |
16a53ecc N |
4980 | seq_printf(seq, "(cache%d: %p %ld) ", |
4981 | i, sh->dev[i].page, sh->dev[i].flags); | |
1da177e4 | 4982 | } |
16a53ecc | 4983 | seq_printf(seq, "\n"); |
1da177e4 LT |
4984 | } |
4985 | ||
d710e138 | 4986 | static void printall(struct seq_file *seq, raid5_conf_t *conf) |
1da177e4 LT |
4987 | { |
4988 | struct stripe_head *sh; | |
fccddba0 | 4989 | struct hlist_node *hn; |
1da177e4 LT |
4990 | int i; |
4991 | ||
4992 | spin_lock_irq(&conf->device_lock); | |
4993 | for (i = 0; i < NR_HASH; i++) { | |
fccddba0 | 4994 | hlist_for_each_entry(sh, hn, &conf->stripe_hashtbl[i], hash) { |
1da177e4 LT |
4995 | if (sh->raid_conf != conf) |
4996 | continue; | |
16a53ecc | 4997 | print_sh(seq, sh); |
1da177e4 LT |
4998 | } |
4999 | } | |
5000 | spin_unlock_irq(&conf->device_lock); | |
5001 | } | |
5002 | #endif | |
5003 | ||
d710e138 | 5004 | static void status(struct seq_file *seq, mddev_t *mddev) |
1da177e4 | 5005 | { |
7b92813c | 5006 | raid5_conf_t *conf = mddev->private; |
1da177e4 LT |
5007 | int i; |
5008 | ||
9d8f0363 AN |
5009 | seq_printf(seq, " level %d, %dk chunk, algorithm %d", mddev->level, |
5010 | mddev->chunk_sectors / 2, mddev->layout); | |
02c2de8c | 5011 | seq_printf (seq, " [%d/%d] [", conf->raid_disks, conf->raid_disks - mddev->degraded); |
1da177e4 LT |
5012 | for (i = 0; i < conf->raid_disks; i++) |
5013 | seq_printf (seq, "%s", | |
5014 | conf->disks[i].rdev && | |
b2d444d7 | 5015 | test_bit(In_sync, &conf->disks[i].rdev->flags) ? "U" : "_"); |
1da177e4 | 5016 | seq_printf (seq, "]"); |
45b4233c | 5017 | #ifdef DEBUG |
16a53ecc N |
5018 | seq_printf (seq, "\n"); |
5019 | printall(seq, conf); | |
1da177e4 LT |
5020 | #endif |
5021 | } | |
5022 | ||
5023 | static void print_raid5_conf (raid5_conf_t *conf) | |
5024 | { | |
5025 | int i; | |
5026 | struct disk_info *tmp; | |
5027 | ||
0c55e022 | 5028 | printk(KERN_DEBUG "RAID conf printout:\n"); |
1da177e4 LT |
5029 | if (!conf) { |
5030 | printk("(conf==NULL)\n"); | |
5031 | return; | |
5032 | } | |
0c55e022 N |
5033 | printk(KERN_DEBUG " --- level:%d rd:%d wd:%d\n", conf->level, |
5034 | conf->raid_disks, | |
5035 | conf->raid_disks - conf->mddev->degraded); | |
1da177e4 LT |
5036 | |
5037 | for (i = 0; i < conf->raid_disks; i++) { | |
5038 | char b[BDEVNAME_SIZE]; | |
5039 | tmp = conf->disks + i; | |
5040 | if (tmp->rdev) | |
0c55e022 N |
5041 | printk(KERN_DEBUG " disk %d, o:%d, dev:%s\n", |
5042 | i, !test_bit(Faulty, &tmp->rdev->flags), | |
5043 | bdevname(tmp->rdev->bdev, b)); | |
1da177e4 LT |
5044 | } |
5045 | } | |
5046 | ||
5047 | static int raid5_spare_active(mddev_t *mddev) | |
5048 | { | |
5049 | int i; | |
5050 | raid5_conf_t *conf = mddev->private; | |
5051 | struct disk_info *tmp; | |
6b965620 N |
5052 | int count = 0; |
5053 | unsigned long flags; | |
1da177e4 LT |
5054 | |
5055 | for (i = 0; i < conf->raid_disks; i++) { | |
5056 | tmp = conf->disks + i; | |
5057 | if (tmp->rdev | |
70fffd0b | 5058 | && tmp->rdev->recovery_offset == MaxSector |
b2d444d7 | 5059 | && !test_bit(Faulty, &tmp->rdev->flags) |
c04be0aa | 5060 | && !test_and_set_bit(In_sync, &tmp->rdev->flags)) { |
6b965620 | 5061 | count++; |
43c73ca4 | 5062 | sysfs_notify_dirent_safe(tmp->rdev->sysfs_state); |
1da177e4 LT |
5063 | } |
5064 | } | |
6b965620 N |
5065 | spin_lock_irqsave(&conf->device_lock, flags); |
5066 | mddev->degraded -= count; | |
5067 | spin_unlock_irqrestore(&conf->device_lock, flags); | |
1da177e4 | 5068 | print_raid5_conf(conf); |
6b965620 | 5069 | return count; |
1da177e4 LT |
5070 | } |
5071 | ||
5072 | static int raid5_remove_disk(mddev_t *mddev, int number) | |
5073 | { | |
5074 | raid5_conf_t *conf = mddev->private; | |
5075 | int err = 0; | |
5076 | mdk_rdev_t *rdev; | |
5077 | struct disk_info *p = conf->disks + number; | |
5078 | ||
5079 | print_raid5_conf(conf); | |
5080 | rdev = p->rdev; | |
5081 | if (rdev) { | |
ec32a2bd N |
5082 | if (number >= conf->raid_disks && |
5083 | conf->reshape_progress == MaxSector) | |
5084 | clear_bit(In_sync, &rdev->flags); | |
5085 | ||
b2d444d7 | 5086 | if (test_bit(In_sync, &rdev->flags) || |
1da177e4 LT |
5087 | atomic_read(&rdev->nr_pending)) { |
5088 | err = -EBUSY; | |
5089 | goto abort; | |
5090 | } | |
dfc70645 N |
5091 | /* Only remove non-faulty devices if recovery |
5092 | * isn't possible. | |
5093 | */ | |
5094 | if (!test_bit(Faulty, &rdev->flags) && | |
7f0da59b | 5095 | mddev->recovery_disabled != conf->recovery_disabled && |
674806d6 | 5096 | !has_failed(conf) && |
ec32a2bd | 5097 | number < conf->raid_disks) { |
dfc70645 N |
5098 | err = -EBUSY; |
5099 | goto abort; | |
5100 | } | |
1da177e4 | 5101 | p->rdev = NULL; |
fbd568a3 | 5102 | synchronize_rcu(); |
1da177e4 LT |
5103 | if (atomic_read(&rdev->nr_pending)) { |
5104 | /* lost the race, try later */ | |
5105 | err = -EBUSY; | |
5106 | p->rdev = rdev; | |
5107 | } | |
5108 | } | |
5109 | abort: | |
5110 | ||
5111 | print_raid5_conf(conf); | |
5112 | return err; | |
5113 | } | |
5114 | ||
5115 | static int raid5_add_disk(mddev_t *mddev, mdk_rdev_t *rdev) | |
5116 | { | |
5117 | raid5_conf_t *conf = mddev->private; | |
199050ea | 5118 | int err = -EEXIST; |
1da177e4 LT |
5119 | int disk; |
5120 | struct disk_info *p; | |
6c2fce2e NB |
5121 | int first = 0; |
5122 | int last = conf->raid_disks - 1; | |
1da177e4 | 5123 | |
7f0da59b N |
5124 | if (mddev->recovery_disabled == conf->recovery_disabled) |
5125 | return -EBUSY; | |
5126 | ||
674806d6 | 5127 | if (has_failed(conf)) |
1da177e4 | 5128 | /* no point adding a device */ |
199050ea | 5129 | return -EINVAL; |
1da177e4 | 5130 | |
6c2fce2e NB |
5131 | if (rdev->raid_disk >= 0) |
5132 | first = last = rdev->raid_disk; | |
1da177e4 LT |
5133 | |
5134 | /* | |
16a53ecc N |
5135 | * find the disk ... but prefer rdev->saved_raid_disk |
5136 | * if possible. | |
1da177e4 | 5137 | */ |
16a53ecc | 5138 | if (rdev->saved_raid_disk >= 0 && |
6c2fce2e | 5139 | rdev->saved_raid_disk >= first && |
16a53ecc N |
5140 | conf->disks[rdev->saved_raid_disk].rdev == NULL) |
5141 | disk = rdev->saved_raid_disk; | |
5142 | else | |
6c2fce2e NB |
5143 | disk = first; |
5144 | for ( ; disk <= last ; disk++) | |
1da177e4 | 5145 | if ((p=conf->disks + disk)->rdev == NULL) { |
b2d444d7 | 5146 | clear_bit(In_sync, &rdev->flags); |
1da177e4 | 5147 | rdev->raid_disk = disk; |
199050ea | 5148 | err = 0; |
72626685 N |
5149 | if (rdev->saved_raid_disk != disk) |
5150 | conf->fullsync = 1; | |
d6065f7b | 5151 | rcu_assign_pointer(p->rdev, rdev); |
1da177e4 LT |
5152 | break; |
5153 | } | |
5154 | print_raid5_conf(conf); | |
199050ea | 5155 | return err; |
1da177e4 LT |
5156 | } |
5157 | ||
5158 | static int raid5_resize(mddev_t *mddev, sector_t sectors) | |
5159 | { | |
5160 | /* no resync is happening, and there is enough space | |
5161 | * on all devices, so we can resize. | |
5162 | * We need to make sure resync covers any new space. | |
5163 | * If the array is shrinking we should possibly wait until | |
5164 | * any io in the removed space completes, but it hardly seems | |
5165 | * worth it. | |
5166 | */ | |
9d8f0363 | 5167 | sectors &= ~((sector_t)mddev->chunk_sectors - 1); |
1f403624 DW |
5168 | md_set_array_sectors(mddev, raid5_size(mddev, sectors, |
5169 | mddev->raid_disks)); | |
b522adcd DW |
5170 | if (mddev->array_sectors > |
5171 | raid5_size(mddev, sectors, mddev->raid_disks)) | |
5172 | return -EINVAL; | |
f233ea5c | 5173 | set_capacity(mddev->gendisk, mddev->array_sectors); |
449aad3e | 5174 | revalidate_disk(mddev->gendisk); |
b098636c N |
5175 | if (sectors > mddev->dev_sectors && |
5176 | mddev->recovery_cp > mddev->dev_sectors) { | |
58c0fed4 | 5177 | mddev->recovery_cp = mddev->dev_sectors; |
1da177e4 LT |
5178 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
5179 | } | |
58c0fed4 | 5180 | mddev->dev_sectors = sectors; |
4b5c7ae8 | 5181 | mddev->resync_max_sectors = sectors; |
1da177e4 LT |
5182 | return 0; |
5183 | } | |
5184 | ||
01ee22b4 N |
5185 | static int check_stripe_cache(mddev_t *mddev) |
5186 | { | |
5187 | /* Can only proceed if there are plenty of stripe_heads. | |
5188 | * We need a minimum of one full stripe,, and for sensible progress | |
5189 | * it is best to have about 4 times that. | |
5190 | * If we require 4 times, then the default 256 4K stripe_heads will | |
5191 | * allow for chunk sizes up to 256K, which is probably OK. | |
5192 | * If the chunk size is greater, user-space should request more | |
5193 | * stripe_heads first. | |
5194 | */ | |
5195 | raid5_conf_t *conf = mddev->private; | |
5196 | if (((mddev->chunk_sectors << 9) / STRIPE_SIZE) * 4 | |
5197 | > conf->max_nr_stripes || | |
5198 | ((mddev->new_chunk_sectors << 9) / STRIPE_SIZE) * 4 | |
5199 | > conf->max_nr_stripes) { | |
0c55e022 N |
5200 | printk(KERN_WARNING "md/raid:%s: reshape: not enough stripes. Needed %lu\n", |
5201 | mdname(mddev), | |
01ee22b4 N |
5202 | ((max(mddev->chunk_sectors, mddev->new_chunk_sectors) << 9) |
5203 | / STRIPE_SIZE)*4); | |
5204 | return 0; | |
5205 | } | |
5206 | return 1; | |
5207 | } | |
5208 | ||
50ac168a | 5209 | static int check_reshape(mddev_t *mddev) |
29269553 | 5210 | { |
070ec55d | 5211 | raid5_conf_t *conf = mddev->private; |
29269553 | 5212 | |
88ce4930 N |
5213 | if (mddev->delta_disks == 0 && |
5214 | mddev->new_layout == mddev->layout && | |
664e7c41 | 5215 | mddev->new_chunk_sectors == mddev->chunk_sectors) |
50ac168a | 5216 | return 0; /* nothing to do */ |
dba034ee N |
5217 | if (mddev->bitmap) |
5218 | /* Cannot grow a bitmap yet */ | |
5219 | return -EBUSY; | |
674806d6 | 5220 | if (has_failed(conf)) |
ec32a2bd N |
5221 | return -EINVAL; |
5222 | if (mddev->delta_disks < 0) { | |
5223 | /* We might be able to shrink, but the devices must | |
5224 | * be made bigger first. | |
5225 | * For raid6, 4 is the minimum size. | |
5226 | * Otherwise 2 is the minimum | |
5227 | */ | |
5228 | int min = 2; | |
5229 | if (mddev->level == 6) | |
5230 | min = 4; | |
5231 | if (mddev->raid_disks + mddev->delta_disks < min) | |
5232 | return -EINVAL; | |
5233 | } | |
29269553 | 5234 | |
01ee22b4 | 5235 | if (!check_stripe_cache(mddev)) |
29269553 | 5236 | return -ENOSPC; |
29269553 | 5237 | |
ec32a2bd | 5238 | return resize_stripes(conf, conf->raid_disks + mddev->delta_disks); |
63c70c4f N |
5239 | } |
5240 | ||
5241 | static int raid5_start_reshape(mddev_t *mddev) | |
5242 | { | |
070ec55d | 5243 | raid5_conf_t *conf = mddev->private; |
63c70c4f | 5244 | mdk_rdev_t *rdev; |
63c70c4f | 5245 | int spares = 0; |
c04be0aa | 5246 | unsigned long flags; |
63c70c4f | 5247 | |
f416885e | 5248 | if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) |
63c70c4f N |
5249 | return -EBUSY; |
5250 | ||
01ee22b4 N |
5251 | if (!check_stripe_cache(mddev)) |
5252 | return -ENOSPC; | |
5253 | ||
159ec1fc | 5254 | list_for_each_entry(rdev, &mddev->disks, same_set) |
469518a3 N |
5255 | if (!test_bit(In_sync, &rdev->flags) |
5256 | && !test_bit(Faulty, &rdev->flags)) | |
29269553 | 5257 | spares++; |
63c70c4f | 5258 | |
f416885e | 5259 | if (spares - mddev->degraded < mddev->delta_disks - conf->max_degraded) |
29269553 N |
5260 | /* Not enough devices even to make a degraded array |
5261 | * of that size | |
5262 | */ | |
5263 | return -EINVAL; | |
5264 | ||
ec32a2bd N |
5265 | /* Refuse to reduce size of the array. Any reductions in |
5266 | * array size must be through explicit setting of array_size | |
5267 | * attribute. | |
5268 | */ | |
5269 | if (raid5_size(mddev, 0, conf->raid_disks + mddev->delta_disks) | |
5270 | < mddev->array_sectors) { | |
0c55e022 | 5271 | printk(KERN_ERR "md/raid:%s: array size must be reduced " |
ec32a2bd N |
5272 | "before number of disks\n", mdname(mddev)); |
5273 | return -EINVAL; | |
5274 | } | |
5275 | ||
f6705578 | 5276 | atomic_set(&conf->reshape_stripes, 0); |
29269553 N |
5277 | spin_lock_irq(&conf->device_lock); |
5278 | conf->previous_raid_disks = conf->raid_disks; | |
63c70c4f | 5279 | conf->raid_disks += mddev->delta_disks; |
09c9e5fa AN |
5280 | conf->prev_chunk_sectors = conf->chunk_sectors; |
5281 | conf->chunk_sectors = mddev->new_chunk_sectors; | |
88ce4930 N |
5282 | conf->prev_algo = conf->algorithm; |
5283 | conf->algorithm = mddev->new_layout; | |
fef9c61f N |
5284 | if (mddev->delta_disks < 0) |
5285 | conf->reshape_progress = raid5_size(mddev, 0, 0); | |
5286 | else | |
5287 | conf->reshape_progress = 0; | |
5288 | conf->reshape_safe = conf->reshape_progress; | |
86b42c71 | 5289 | conf->generation++; |
29269553 N |
5290 | spin_unlock_irq(&conf->device_lock); |
5291 | ||
5292 | /* Add some new drives, as many as will fit. | |
5293 | * We know there are enough to make the newly sized array work. | |
3424bf6a N |
5294 | * Don't add devices if we are reducing the number of |
5295 | * devices in the array. This is because it is not possible | |
5296 | * to correctly record the "partially reconstructed" state of | |
5297 | * such devices during the reshape and confusion could result. | |
29269553 | 5298 | */ |
87a8dec9 N |
5299 | if (mddev->delta_disks >= 0) { |
5300 | int added_devices = 0; | |
5301 | list_for_each_entry(rdev, &mddev->disks, same_set) | |
5302 | if (rdev->raid_disk < 0 && | |
5303 | !test_bit(Faulty, &rdev->flags)) { | |
5304 | if (raid5_add_disk(mddev, rdev) == 0) { | |
87a8dec9 N |
5305 | if (rdev->raid_disk |
5306 | >= conf->previous_raid_disks) { | |
5307 | set_bit(In_sync, &rdev->flags); | |
5308 | added_devices++; | |
5309 | } else | |
5310 | rdev->recovery_offset = 0; | |
36fad858 NK |
5311 | |
5312 | if (sysfs_link_rdev(mddev, rdev)) | |
87a8dec9 | 5313 | /* Failure here is OK */; |
50da0840 | 5314 | } |
87a8dec9 N |
5315 | } else if (rdev->raid_disk >= conf->previous_raid_disks |
5316 | && !test_bit(Faulty, &rdev->flags)) { | |
5317 | /* This is a spare that was manually added */ | |
5318 | set_bit(In_sync, &rdev->flags); | |
5319 | added_devices++; | |
5320 | } | |
29269553 | 5321 | |
87a8dec9 N |
5322 | /* When a reshape changes the number of devices, |
5323 | * ->degraded is measured against the larger of the | |
5324 | * pre and post number of devices. | |
5325 | */ | |
ec32a2bd | 5326 | spin_lock_irqsave(&conf->device_lock, flags); |
9eb07c25 | 5327 | mddev->degraded += (conf->raid_disks - conf->previous_raid_disks) |
ec32a2bd N |
5328 | - added_devices; |
5329 | spin_unlock_irqrestore(&conf->device_lock, flags); | |
5330 | } | |
63c70c4f | 5331 | mddev->raid_disks = conf->raid_disks; |
e516402c | 5332 | mddev->reshape_position = conf->reshape_progress; |
850b2b42 | 5333 | set_bit(MD_CHANGE_DEVS, &mddev->flags); |
f6705578 | 5334 | |
29269553 N |
5335 | clear_bit(MD_RECOVERY_SYNC, &mddev->recovery); |
5336 | clear_bit(MD_RECOVERY_CHECK, &mddev->recovery); | |
5337 | set_bit(MD_RECOVERY_RESHAPE, &mddev->recovery); | |
5338 | set_bit(MD_RECOVERY_RUNNING, &mddev->recovery); | |
5339 | mddev->sync_thread = md_register_thread(md_do_sync, mddev, | |
0da3c619 | 5340 | "reshape"); |
29269553 N |
5341 | if (!mddev->sync_thread) { |
5342 | mddev->recovery = 0; | |
5343 | spin_lock_irq(&conf->device_lock); | |
5344 | mddev->raid_disks = conf->raid_disks = conf->previous_raid_disks; | |
fef9c61f | 5345 | conf->reshape_progress = MaxSector; |
29269553 N |
5346 | spin_unlock_irq(&conf->device_lock); |
5347 | return -EAGAIN; | |
5348 | } | |
c8f517c4 | 5349 | conf->reshape_checkpoint = jiffies; |
29269553 N |
5350 | md_wakeup_thread(mddev->sync_thread); |
5351 | md_new_event(mddev); | |
5352 | return 0; | |
5353 | } | |
29269553 | 5354 | |
ec32a2bd N |
5355 | /* This is called from the reshape thread and should make any |
5356 | * changes needed in 'conf' | |
5357 | */ | |
29269553 N |
5358 | static void end_reshape(raid5_conf_t *conf) |
5359 | { | |
29269553 | 5360 | |
f6705578 | 5361 | if (!test_bit(MD_RECOVERY_INTR, &conf->mddev->recovery)) { |
f6705578 | 5362 | |
f6705578 | 5363 | spin_lock_irq(&conf->device_lock); |
cea9c228 | 5364 | conf->previous_raid_disks = conf->raid_disks; |
fef9c61f | 5365 | conf->reshape_progress = MaxSector; |
f6705578 | 5366 | spin_unlock_irq(&conf->device_lock); |
b0f9ec04 | 5367 | wake_up(&conf->wait_for_overlap); |
16a53ecc N |
5368 | |
5369 | /* read-ahead size must cover two whole stripes, which is | |
5370 | * 2 * (datadisks) * chunksize where 'n' is the number of raid devices | |
5371 | */ | |
4a5add49 | 5372 | if (conf->mddev->queue) { |
cea9c228 | 5373 | int data_disks = conf->raid_disks - conf->max_degraded; |
09c9e5fa | 5374 | int stripe = data_disks * ((conf->chunk_sectors << 9) |
cea9c228 | 5375 | / PAGE_SIZE); |
16a53ecc N |
5376 | if (conf->mddev->queue->backing_dev_info.ra_pages < 2 * stripe) |
5377 | conf->mddev->queue->backing_dev_info.ra_pages = 2 * stripe; | |
5378 | } | |
29269553 | 5379 | } |
29269553 N |
5380 | } |
5381 | ||
ec32a2bd N |
5382 | /* This is called from the raid5d thread with mddev_lock held. |
5383 | * It makes config changes to the device. | |
5384 | */ | |
cea9c228 N |
5385 | static void raid5_finish_reshape(mddev_t *mddev) |
5386 | { | |
070ec55d | 5387 | raid5_conf_t *conf = mddev->private; |
cea9c228 N |
5388 | |
5389 | if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery)) { | |
5390 | ||
ec32a2bd N |
5391 | if (mddev->delta_disks > 0) { |
5392 | md_set_array_sectors(mddev, raid5_size(mddev, 0, 0)); | |
5393 | set_capacity(mddev->gendisk, mddev->array_sectors); | |
449aad3e | 5394 | revalidate_disk(mddev->gendisk); |
ec32a2bd N |
5395 | } else { |
5396 | int d; | |
ec32a2bd N |
5397 | mddev->degraded = conf->raid_disks; |
5398 | for (d = 0; d < conf->raid_disks ; d++) | |
5399 | if (conf->disks[d].rdev && | |
5400 | test_bit(In_sync, | |
5401 | &conf->disks[d].rdev->flags)) | |
5402 | mddev->degraded--; | |
5403 | for (d = conf->raid_disks ; | |
5404 | d < conf->raid_disks - mddev->delta_disks; | |
1a67dde0 N |
5405 | d++) { |
5406 | mdk_rdev_t *rdev = conf->disks[d].rdev; | |
5407 | if (rdev && raid5_remove_disk(mddev, d) == 0) { | |
36fad858 | 5408 | sysfs_unlink_rdev(mddev, rdev); |
1a67dde0 N |
5409 | rdev->raid_disk = -1; |
5410 | } | |
5411 | } | |
cea9c228 | 5412 | } |
88ce4930 | 5413 | mddev->layout = conf->algorithm; |
09c9e5fa | 5414 | mddev->chunk_sectors = conf->chunk_sectors; |
ec32a2bd N |
5415 | mddev->reshape_position = MaxSector; |
5416 | mddev->delta_disks = 0; | |
cea9c228 N |
5417 | } |
5418 | } | |
5419 | ||
72626685 N |
5420 | static void raid5_quiesce(mddev_t *mddev, int state) |
5421 | { | |
070ec55d | 5422 | raid5_conf_t *conf = mddev->private; |
72626685 N |
5423 | |
5424 | switch(state) { | |
e464eafd N |
5425 | case 2: /* resume for a suspend */ |
5426 | wake_up(&conf->wait_for_overlap); | |
5427 | break; | |
5428 | ||
72626685 N |
5429 | case 1: /* stop all writes */ |
5430 | spin_lock_irq(&conf->device_lock); | |
64bd660b N |
5431 | /* '2' tells resync/reshape to pause so that all |
5432 | * active stripes can drain | |
5433 | */ | |
5434 | conf->quiesce = 2; | |
72626685 | 5435 | wait_event_lock_irq(conf->wait_for_stripe, |
46031f9a RBJ |
5436 | atomic_read(&conf->active_stripes) == 0 && |
5437 | atomic_read(&conf->active_aligned_reads) == 0, | |
72626685 | 5438 | conf->device_lock, /* nothing */); |
64bd660b | 5439 | conf->quiesce = 1; |
72626685 | 5440 | spin_unlock_irq(&conf->device_lock); |
64bd660b N |
5441 | /* allow reshape to continue */ |
5442 | wake_up(&conf->wait_for_overlap); | |
72626685 N |
5443 | break; |
5444 | ||
5445 | case 0: /* re-enable writes */ | |
5446 | spin_lock_irq(&conf->device_lock); | |
5447 | conf->quiesce = 0; | |
5448 | wake_up(&conf->wait_for_stripe); | |
e464eafd | 5449 | wake_up(&conf->wait_for_overlap); |
72626685 N |
5450 | spin_unlock_irq(&conf->device_lock); |
5451 | break; | |
5452 | } | |
72626685 | 5453 | } |
b15c2e57 | 5454 | |
d562b0c4 | 5455 | |
f1b29bca | 5456 | static void *raid45_takeover_raid0(mddev_t *mddev, int level) |
54071b38 | 5457 | { |
f1b29bca | 5458 | struct raid0_private_data *raid0_priv = mddev->private; |
d76c8420 | 5459 | sector_t sectors; |
54071b38 | 5460 | |
f1b29bca DW |
5461 | /* for raid0 takeover only one zone is supported */ |
5462 | if (raid0_priv->nr_strip_zones > 1) { | |
0c55e022 N |
5463 | printk(KERN_ERR "md/raid:%s: cannot takeover raid0 with more than one zone.\n", |
5464 | mdname(mddev)); | |
f1b29bca DW |
5465 | return ERR_PTR(-EINVAL); |
5466 | } | |
5467 | ||
3b71bd93 N |
5468 | sectors = raid0_priv->strip_zone[0].zone_end; |
5469 | sector_div(sectors, raid0_priv->strip_zone[0].nb_dev); | |
5470 | mddev->dev_sectors = sectors; | |
f1b29bca | 5471 | mddev->new_level = level; |
54071b38 TM |
5472 | mddev->new_layout = ALGORITHM_PARITY_N; |
5473 | mddev->new_chunk_sectors = mddev->chunk_sectors; | |
5474 | mddev->raid_disks += 1; | |
5475 | mddev->delta_disks = 1; | |
5476 | /* make sure it will be not marked as dirty */ | |
5477 | mddev->recovery_cp = MaxSector; | |
5478 | ||
5479 | return setup_conf(mddev); | |
5480 | } | |
5481 | ||
5482 | ||
d562b0c4 N |
5483 | static void *raid5_takeover_raid1(mddev_t *mddev) |
5484 | { | |
5485 | int chunksect; | |
5486 | ||
5487 | if (mddev->raid_disks != 2 || | |
5488 | mddev->degraded > 1) | |
5489 | return ERR_PTR(-EINVAL); | |
5490 | ||
5491 | /* Should check if there are write-behind devices? */ | |
5492 | ||
5493 | chunksect = 64*2; /* 64K by default */ | |
5494 | ||
5495 | /* The array must be an exact multiple of chunksize */ | |
5496 | while (chunksect && (mddev->array_sectors & (chunksect-1))) | |
5497 | chunksect >>= 1; | |
5498 | ||
5499 | if ((chunksect<<9) < STRIPE_SIZE) | |
5500 | /* array size does not allow a suitable chunk size */ | |
5501 | return ERR_PTR(-EINVAL); | |
5502 | ||
5503 | mddev->new_level = 5; | |
5504 | mddev->new_layout = ALGORITHM_LEFT_SYMMETRIC; | |
664e7c41 | 5505 | mddev->new_chunk_sectors = chunksect; |
d562b0c4 N |
5506 | |
5507 | return setup_conf(mddev); | |
5508 | } | |
5509 | ||
fc9739c6 N |
5510 | static void *raid5_takeover_raid6(mddev_t *mddev) |
5511 | { | |
5512 | int new_layout; | |
5513 | ||
5514 | switch (mddev->layout) { | |
5515 | case ALGORITHM_LEFT_ASYMMETRIC_6: | |
5516 | new_layout = ALGORITHM_LEFT_ASYMMETRIC; | |
5517 | break; | |
5518 | case ALGORITHM_RIGHT_ASYMMETRIC_6: | |
5519 | new_layout = ALGORITHM_RIGHT_ASYMMETRIC; | |
5520 | break; | |
5521 | case ALGORITHM_LEFT_SYMMETRIC_6: | |
5522 | new_layout = ALGORITHM_LEFT_SYMMETRIC; | |
5523 | break; | |
5524 | case ALGORITHM_RIGHT_SYMMETRIC_6: | |
5525 | new_layout = ALGORITHM_RIGHT_SYMMETRIC; | |
5526 | break; | |
5527 | case ALGORITHM_PARITY_0_6: | |
5528 | new_layout = ALGORITHM_PARITY_0; | |
5529 | break; | |
5530 | case ALGORITHM_PARITY_N: | |
5531 | new_layout = ALGORITHM_PARITY_N; | |
5532 | break; | |
5533 | default: | |
5534 | return ERR_PTR(-EINVAL); | |
5535 | } | |
5536 | mddev->new_level = 5; | |
5537 | mddev->new_layout = new_layout; | |
5538 | mddev->delta_disks = -1; | |
5539 | mddev->raid_disks -= 1; | |
5540 | return setup_conf(mddev); | |
5541 | } | |
5542 | ||
d562b0c4 | 5543 | |
50ac168a | 5544 | static int raid5_check_reshape(mddev_t *mddev) |
b3546035 | 5545 | { |
88ce4930 N |
5546 | /* For a 2-drive array, the layout and chunk size can be changed |
5547 | * immediately as not restriping is needed. | |
5548 | * For larger arrays we record the new value - after validation | |
5549 | * to be used by a reshape pass. | |
b3546035 | 5550 | */ |
070ec55d | 5551 | raid5_conf_t *conf = mddev->private; |
597a711b | 5552 | int new_chunk = mddev->new_chunk_sectors; |
b3546035 | 5553 | |
597a711b | 5554 | if (mddev->new_layout >= 0 && !algorithm_valid_raid5(mddev->new_layout)) |
b3546035 N |
5555 | return -EINVAL; |
5556 | if (new_chunk > 0) { | |
0ba459d2 | 5557 | if (!is_power_of_2(new_chunk)) |
b3546035 | 5558 | return -EINVAL; |
597a711b | 5559 | if (new_chunk < (PAGE_SIZE>>9)) |
b3546035 | 5560 | return -EINVAL; |
597a711b | 5561 | if (mddev->array_sectors & (new_chunk-1)) |
b3546035 N |
5562 | /* not factor of array size */ |
5563 | return -EINVAL; | |
5564 | } | |
5565 | ||
5566 | /* They look valid */ | |
5567 | ||
88ce4930 | 5568 | if (mddev->raid_disks == 2) { |
597a711b N |
5569 | /* can make the change immediately */ |
5570 | if (mddev->new_layout >= 0) { | |
5571 | conf->algorithm = mddev->new_layout; | |
5572 | mddev->layout = mddev->new_layout; | |
88ce4930 N |
5573 | } |
5574 | if (new_chunk > 0) { | |
597a711b N |
5575 | conf->chunk_sectors = new_chunk ; |
5576 | mddev->chunk_sectors = new_chunk; | |
88ce4930 N |
5577 | } |
5578 | set_bit(MD_CHANGE_DEVS, &mddev->flags); | |
5579 | md_wakeup_thread(mddev->thread); | |
b3546035 | 5580 | } |
50ac168a | 5581 | return check_reshape(mddev); |
88ce4930 N |
5582 | } |
5583 | ||
50ac168a | 5584 | static int raid6_check_reshape(mddev_t *mddev) |
88ce4930 | 5585 | { |
597a711b | 5586 | int new_chunk = mddev->new_chunk_sectors; |
50ac168a | 5587 | |
597a711b | 5588 | if (mddev->new_layout >= 0 && !algorithm_valid_raid6(mddev->new_layout)) |
88ce4930 | 5589 | return -EINVAL; |
b3546035 | 5590 | if (new_chunk > 0) { |
0ba459d2 | 5591 | if (!is_power_of_2(new_chunk)) |
88ce4930 | 5592 | return -EINVAL; |
597a711b | 5593 | if (new_chunk < (PAGE_SIZE >> 9)) |
88ce4930 | 5594 | return -EINVAL; |
597a711b | 5595 | if (mddev->array_sectors & (new_chunk-1)) |
88ce4930 N |
5596 | /* not factor of array size */ |
5597 | return -EINVAL; | |
b3546035 | 5598 | } |
88ce4930 N |
5599 | |
5600 | /* They look valid */ | |
50ac168a | 5601 | return check_reshape(mddev); |
b3546035 N |
5602 | } |
5603 | ||
d562b0c4 N |
5604 | static void *raid5_takeover(mddev_t *mddev) |
5605 | { | |
5606 | /* raid5 can take over: | |
f1b29bca | 5607 | * raid0 - if there is only one strip zone - make it a raid4 layout |
d562b0c4 N |
5608 | * raid1 - if there are two drives. We need to know the chunk size |
5609 | * raid4 - trivial - just use a raid4 layout. | |
5610 | * raid6 - Providing it is a *_6 layout | |
d562b0c4 | 5611 | */ |
f1b29bca DW |
5612 | if (mddev->level == 0) |
5613 | return raid45_takeover_raid0(mddev, 5); | |
d562b0c4 N |
5614 | if (mddev->level == 1) |
5615 | return raid5_takeover_raid1(mddev); | |
e9d4758f N |
5616 | if (mddev->level == 4) { |
5617 | mddev->new_layout = ALGORITHM_PARITY_N; | |
5618 | mddev->new_level = 5; | |
5619 | return setup_conf(mddev); | |
5620 | } | |
fc9739c6 N |
5621 | if (mddev->level == 6) |
5622 | return raid5_takeover_raid6(mddev); | |
d562b0c4 N |
5623 | |
5624 | return ERR_PTR(-EINVAL); | |
5625 | } | |
5626 | ||
a78d38a1 N |
5627 | static void *raid4_takeover(mddev_t *mddev) |
5628 | { | |
f1b29bca DW |
5629 | /* raid4 can take over: |
5630 | * raid0 - if there is only one strip zone | |
5631 | * raid5 - if layout is right | |
a78d38a1 | 5632 | */ |
f1b29bca DW |
5633 | if (mddev->level == 0) |
5634 | return raid45_takeover_raid0(mddev, 4); | |
a78d38a1 N |
5635 | if (mddev->level == 5 && |
5636 | mddev->layout == ALGORITHM_PARITY_N) { | |
5637 | mddev->new_layout = 0; | |
5638 | mddev->new_level = 4; | |
5639 | return setup_conf(mddev); | |
5640 | } | |
5641 | return ERR_PTR(-EINVAL); | |
5642 | } | |
d562b0c4 | 5643 | |
245f46c2 N |
5644 | static struct mdk_personality raid5_personality; |
5645 | ||
5646 | static void *raid6_takeover(mddev_t *mddev) | |
5647 | { | |
5648 | /* Currently can only take over a raid5. We map the | |
5649 | * personality to an equivalent raid6 personality | |
5650 | * with the Q block at the end. | |
5651 | */ | |
5652 | int new_layout; | |
5653 | ||
5654 | if (mddev->pers != &raid5_personality) | |
5655 | return ERR_PTR(-EINVAL); | |
5656 | if (mddev->degraded > 1) | |
5657 | return ERR_PTR(-EINVAL); | |
5658 | if (mddev->raid_disks > 253) | |
5659 | return ERR_PTR(-EINVAL); | |
5660 | if (mddev->raid_disks < 3) | |
5661 | return ERR_PTR(-EINVAL); | |
5662 | ||
5663 | switch (mddev->layout) { | |
5664 | case ALGORITHM_LEFT_ASYMMETRIC: | |
5665 | new_layout = ALGORITHM_LEFT_ASYMMETRIC_6; | |
5666 | break; | |
5667 | case ALGORITHM_RIGHT_ASYMMETRIC: | |
5668 | new_layout = ALGORITHM_RIGHT_ASYMMETRIC_6; | |
5669 | break; | |
5670 | case ALGORITHM_LEFT_SYMMETRIC: | |
5671 | new_layout = ALGORITHM_LEFT_SYMMETRIC_6; | |
5672 | break; | |
5673 | case ALGORITHM_RIGHT_SYMMETRIC: | |
5674 | new_layout = ALGORITHM_RIGHT_SYMMETRIC_6; | |
5675 | break; | |
5676 | case ALGORITHM_PARITY_0: | |
5677 | new_layout = ALGORITHM_PARITY_0_6; | |
5678 | break; | |
5679 | case ALGORITHM_PARITY_N: | |
5680 | new_layout = ALGORITHM_PARITY_N; | |
5681 | break; | |
5682 | default: | |
5683 | return ERR_PTR(-EINVAL); | |
5684 | } | |
5685 | mddev->new_level = 6; | |
5686 | mddev->new_layout = new_layout; | |
5687 | mddev->delta_disks = 1; | |
5688 | mddev->raid_disks += 1; | |
5689 | return setup_conf(mddev); | |
5690 | } | |
5691 | ||
5692 | ||
16a53ecc N |
5693 | static struct mdk_personality raid6_personality = |
5694 | { | |
5695 | .name = "raid6", | |
5696 | .level = 6, | |
5697 | .owner = THIS_MODULE, | |
5698 | .make_request = make_request, | |
5699 | .run = run, | |
5700 | .stop = stop, | |
5701 | .status = status, | |
5702 | .error_handler = error, | |
5703 | .hot_add_disk = raid5_add_disk, | |
5704 | .hot_remove_disk= raid5_remove_disk, | |
5705 | .spare_active = raid5_spare_active, | |
5706 | .sync_request = sync_request, | |
5707 | .resize = raid5_resize, | |
80c3a6ce | 5708 | .size = raid5_size, |
50ac168a | 5709 | .check_reshape = raid6_check_reshape, |
f416885e | 5710 | .start_reshape = raid5_start_reshape, |
cea9c228 | 5711 | .finish_reshape = raid5_finish_reshape, |
16a53ecc | 5712 | .quiesce = raid5_quiesce, |
245f46c2 | 5713 | .takeover = raid6_takeover, |
16a53ecc | 5714 | }; |
2604b703 | 5715 | static struct mdk_personality raid5_personality = |
1da177e4 LT |
5716 | { |
5717 | .name = "raid5", | |
2604b703 | 5718 | .level = 5, |
1da177e4 LT |
5719 | .owner = THIS_MODULE, |
5720 | .make_request = make_request, | |
5721 | .run = run, | |
5722 | .stop = stop, | |
5723 | .status = status, | |
5724 | .error_handler = error, | |
5725 | .hot_add_disk = raid5_add_disk, | |
5726 | .hot_remove_disk= raid5_remove_disk, | |
5727 | .spare_active = raid5_spare_active, | |
5728 | .sync_request = sync_request, | |
5729 | .resize = raid5_resize, | |
80c3a6ce | 5730 | .size = raid5_size, |
63c70c4f N |
5731 | .check_reshape = raid5_check_reshape, |
5732 | .start_reshape = raid5_start_reshape, | |
cea9c228 | 5733 | .finish_reshape = raid5_finish_reshape, |
72626685 | 5734 | .quiesce = raid5_quiesce, |
d562b0c4 | 5735 | .takeover = raid5_takeover, |
1da177e4 LT |
5736 | }; |
5737 | ||
2604b703 | 5738 | static struct mdk_personality raid4_personality = |
1da177e4 | 5739 | { |
2604b703 N |
5740 | .name = "raid4", |
5741 | .level = 4, | |
5742 | .owner = THIS_MODULE, | |
5743 | .make_request = make_request, | |
5744 | .run = run, | |
5745 | .stop = stop, | |
5746 | .status = status, | |
5747 | .error_handler = error, | |
5748 | .hot_add_disk = raid5_add_disk, | |
5749 | .hot_remove_disk= raid5_remove_disk, | |
5750 | .spare_active = raid5_spare_active, | |
5751 | .sync_request = sync_request, | |
5752 | .resize = raid5_resize, | |
80c3a6ce | 5753 | .size = raid5_size, |
3d37890b N |
5754 | .check_reshape = raid5_check_reshape, |
5755 | .start_reshape = raid5_start_reshape, | |
cea9c228 | 5756 | .finish_reshape = raid5_finish_reshape, |
2604b703 | 5757 | .quiesce = raid5_quiesce, |
a78d38a1 | 5758 | .takeover = raid4_takeover, |
2604b703 N |
5759 | }; |
5760 | ||
5761 | static int __init raid5_init(void) | |
5762 | { | |
16a53ecc | 5763 | register_md_personality(&raid6_personality); |
2604b703 N |
5764 | register_md_personality(&raid5_personality); |
5765 | register_md_personality(&raid4_personality); | |
5766 | return 0; | |
1da177e4 LT |
5767 | } |
5768 | ||
2604b703 | 5769 | static void raid5_exit(void) |
1da177e4 | 5770 | { |
16a53ecc | 5771 | unregister_md_personality(&raid6_personality); |
2604b703 N |
5772 | unregister_md_personality(&raid5_personality); |
5773 | unregister_md_personality(&raid4_personality); | |
1da177e4 LT |
5774 | } |
5775 | ||
5776 | module_init(raid5_init); | |
5777 | module_exit(raid5_exit); | |
5778 | MODULE_LICENSE("GPL"); | |
0efb9e61 | 5779 | MODULE_DESCRIPTION("RAID4/5/6 (striping with parity) personality for MD"); |
1da177e4 | 5780 | MODULE_ALIAS("md-personality-4"); /* RAID5 */ |
d9d166c2 N |
5781 | MODULE_ALIAS("md-raid5"); |
5782 | MODULE_ALIAS("md-raid4"); | |
2604b703 N |
5783 | MODULE_ALIAS("md-level-5"); |
5784 | MODULE_ALIAS("md-level-4"); | |
16a53ecc N |
5785 | MODULE_ALIAS("md-personality-8"); /* RAID6 */ |
5786 | MODULE_ALIAS("md-raid6"); | |
5787 | MODULE_ALIAS("md-level-6"); | |
5788 | ||
5789 | /* This used to be two separate modules, they were: */ | |
5790 | MODULE_ALIAS("raid5"); | |
5791 | MODULE_ALIAS("raid6"); |