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. | |
30 | * conf->bm_write is the number of the last batch successfully written. | |
31 | * conf->bm_flush is the number of the last batch that was closed to | |
32 | * new additions. | |
33 | * When we discover that we will need to write to any block in a stripe | |
34 | * (in add_stripe_bio) we update the in-memory bitmap and record in sh->bm_seq | |
35 | * the number of the batch it will be in. This is bm_flush+1. | |
36 | * When we are ready to do a write, if that batch hasn't been written yet, | |
37 | * we plug the array and queue the stripe for later. | |
38 | * When an unplug happens, we increment bm_flush, thus closing the current | |
39 | * batch. | |
40 | * When we notice that bm_flush > bm_write, we write out all pending updates | |
41 | * to the bitmap, and advance bm_write to where bm_flush was. | |
42 | * This may occasionally write a bit out twice, but is sure never to | |
43 | * miss any bits. | |
44 | */ | |
1da177e4 | 45 | |
f6705578 | 46 | #include <linux/kthread.h> |
16a53ecc | 47 | #include "raid6.h" |
1da177e4 | 48 | |
72626685 | 49 | #include <linux/raid/bitmap.h> |
91c00924 | 50 | #include <linux/async_tx.h> |
72626685 | 51 | |
1da177e4 LT |
52 | /* |
53 | * Stripe cache | |
54 | */ | |
55 | ||
56 | #define NR_STRIPES 256 | |
57 | #define STRIPE_SIZE PAGE_SIZE | |
58 | #define STRIPE_SHIFT (PAGE_SHIFT - 9) | |
59 | #define STRIPE_SECTORS (STRIPE_SIZE>>9) | |
60 | #define IO_THRESHOLD 1 | |
8b3e6cdc | 61 | #define BYPASS_THRESHOLD 1 |
fccddba0 | 62 | #define NR_HASH (PAGE_SIZE / sizeof(struct hlist_head)) |
1da177e4 LT |
63 | #define HASH_MASK (NR_HASH - 1) |
64 | ||
fccddba0 | 65 | #define stripe_hash(conf, sect) (&((conf)->stripe_hashtbl[((sect) >> STRIPE_SHIFT) & HASH_MASK])) |
1da177e4 LT |
66 | |
67 | /* bio's attached to a stripe+device for I/O are linked together in bi_sector | |
68 | * order without overlap. There may be several bio's per stripe+device, and | |
69 | * a bio could span several devices. | |
70 | * When walking this list for a particular stripe+device, we must never proceed | |
71 | * beyond a bio that extends past this device, as the next bio might no longer | |
72 | * be valid. | |
73 | * This macro is used to determine the 'next' bio in the list, given the sector | |
74 | * of the current stripe+device | |
75 | */ | |
76 | #define r5_next_bio(bio, sect) ( ( (bio)->bi_sector + ((bio)->bi_size>>9) < sect + STRIPE_SECTORS) ? (bio)->bi_next : NULL) | |
77 | /* | |
78 | * The following can be used to debug the driver | |
79 | */ | |
1da177e4 LT |
80 | #define RAID5_PARANOIA 1 |
81 | #if RAID5_PARANOIA && defined(CONFIG_SMP) | |
82 | # define CHECK_DEVLOCK() assert_spin_locked(&conf->device_lock) | |
83 | #else | |
84 | # define CHECK_DEVLOCK() | |
85 | #endif | |
86 | ||
45b4233c | 87 | #ifdef DEBUG |
1da177e4 LT |
88 | #define inline |
89 | #define __inline__ | |
90 | #endif | |
91 | ||
6be9d494 BS |
92 | #define printk_rl(args...) ((void) (printk_ratelimit() && printk(args))) |
93 | ||
16a53ecc N |
94 | #if !RAID6_USE_EMPTY_ZERO_PAGE |
95 | /* In .bss so it's zeroed */ | |
96 | const char raid6_empty_zero_page[PAGE_SIZE] __attribute__((aligned(256))); | |
97 | #endif | |
98 | ||
960e739d | 99 | /* |
5b99c2ff JA |
100 | * We maintain a biased count of active stripes in the bottom 16 bits of |
101 | * bi_phys_segments, and a count of processed stripes in the upper 16 bits | |
960e739d JA |
102 | */ |
103 | static inline int raid5_bi_phys_segments(struct bio *bio) | |
104 | { | |
5b99c2ff | 105 | return bio->bi_phys_segments & 0xffff; |
960e739d JA |
106 | } |
107 | ||
108 | static inline int raid5_bi_hw_segments(struct bio *bio) | |
109 | { | |
5b99c2ff | 110 | return (bio->bi_phys_segments >> 16) & 0xffff; |
960e739d JA |
111 | } |
112 | ||
113 | static inline int raid5_dec_bi_phys_segments(struct bio *bio) | |
114 | { | |
115 | --bio->bi_phys_segments; | |
116 | return raid5_bi_phys_segments(bio); | |
117 | } | |
118 | ||
119 | static inline int raid5_dec_bi_hw_segments(struct bio *bio) | |
120 | { | |
121 | unsigned short val = raid5_bi_hw_segments(bio); | |
122 | ||
123 | --val; | |
5b99c2ff | 124 | bio->bi_phys_segments = (val << 16) | raid5_bi_phys_segments(bio); |
960e739d JA |
125 | return val; |
126 | } | |
127 | ||
128 | static inline void raid5_set_bi_hw_segments(struct bio *bio, unsigned int cnt) | |
129 | { | |
5b99c2ff | 130 | bio->bi_phys_segments = raid5_bi_phys_segments(bio) || (cnt << 16); |
960e739d JA |
131 | } |
132 | ||
16a53ecc N |
133 | static inline int raid6_next_disk(int disk, int raid_disks) |
134 | { | |
135 | disk++; | |
136 | return (disk < raid_disks) ? disk : 0; | |
137 | } | |
a4456856 DW |
138 | |
139 | static void return_io(struct bio *return_bi) | |
140 | { | |
141 | struct bio *bi = return_bi; | |
142 | while (bi) { | |
a4456856 DW |
143 | |
144 | return_bi = bi->bi_next; | |
145 | bi->bi_next = NULL; | |
146 | bi->bi_size = 0; | |
0e13fe23 | 147 | bio_endio(bi, 0); |
a4456856 DW |
148 | bi = return_bi; |
149 | } | |
150 | } | |
151 | ||
1da177e4 LT |
152 | static void print_raid5_conf (raid5_conf_t *conf); |
153 | ||
600aa109 DW |
154 | static int stripe_operations_active(struct stripe_head *sh) |
155 | { | |
156 | return sh->check_state || sh->reconstruct_state || | |
157 | test_bit(STRIPE_BIOFILL_RUN, &sh->state) || | |
158 | test_bit(STRIPE_COMPUTE_RUN, &sh->state); | |
159 | } | |
160 | ||
858119e1 | 161 | static void __release_stripe(raid5_conf_t *conf, struct stripe_head *sh) |
1da177e4 LT |
162 | { |
163 | if (atomic_dec_and_test(&sh->count)) { | |
78bafebd ES |
164 | BUG_ON(!list_empty(&sh->lru)); |
165 | BUG_ON(atomic_read(&conf->active_stripes)==0); | |
1da177e4 | 166 | if (test_bit(STRIPE_HANDLE, &sh->state)) { |
7c785b7a | 167 | if (test_bit(STRIPE_DELAYED, &sh->state)) { |
1da177e4 | 168 | list_add_tail(&sh->lru, &conf->delayed_list); |
7c785b7a N |
169 | blk_plug_device(conf->mddev->queue); |
170 | } else if (test_bit(STRIPE_BIT_DELAY, &sh->state) && | |
ae3c20cc | 171 | sh->bm_seq - conf->seq_write > 0) { |
72626685 | 172 | list_add_tail(&sh->lru, &conf->bitmap_list); |
7c785b7a N |
173 | blk_plug_device(conf->mddev->queue); |
174 | } else { | |
72626685 | 175 | clear_bit(STRIPE_BIT_DELAY, &sh->state); |
1da177e4 | 176 | list_add_tail(&sh->lru, &conf->handle_list); |
72626685 | 177 | } |
1da177e4 LT |
178 | md_wakeup_thread(conf->mddev->thread); |
179 | } else { | |
600aa109 | 180 | BUG_ON(stripe_operations_active(sh)); |
1da177e4 LT |
181 | if (test_and_clear_bit(STRIPE_PREREAD_ACTIVE, &sh->state)) { |
182 | atomic_dec(&conf->preread_active_stripes); | |
183 | if (atomic_read(&conf->preread_active_stripes) < IO_THRESHOLD) | |
184 | md_wakeup_thread(conf->mddev->thread); | |
185 | } | |
1da177e4 | 186 | atomic_dec(&conf->active_stripes); |
ccfcc3c1 N |
187 | if (!test_bit(STRIPE_EXPANDING, &sh->state)) { |
188 | list_add_tail(&sh->lru, &conf->inactive_list); | |
1da177e4 | 189 | wake_up(&conf->wait_for_stripe); |
46031f9a RBJ |
190 | if (conf->retry_read_aligned) |
191 | md_wakeup_thread(conf->mddev->thread); | |
ccfcc3c1 | 192 | } |
1da177e4 LT |
193 | } |
194 | } | |
195 | } | |
196 | static void release_stripe(struct stripe_head *sh) | |
197 | { | |
198 | raid5_conf_t *conf = sh->raid_conf; | |
199 | unsigned long flags; | |
16a53ecc | 200 | |
1da177e4 LT |
201 | spin_lock_irqsave(&conf->device_lock, flags); |
202 | __release_stripe(conf, sh); | |
203 | spin_unlock_irqrestore(&conf->device_lock, flags); | |
204 | } | |
205 | ||
fccddba0 | 206 | static inline void remove_hash(struct stripe_head *sh) |
1da177e4 | 207 | { |
45b4233c DW |
208 | pr_debug("remove_hash(), stripe %llu\n", |
209 | (unsigned long long)sh->sector); | |
1da177e4 | 210 | |
fccddba0 | 211 | hlist_del_init(&sh->hash); |
1da177e4 LT |
212 | } |
213 | ||
16a53ecc | 214 | static inline void insert_hash(raid5_conf_t *conf, struct stripe_head *sh) |
1da177e4 | 215 | { |
fccddba0 | 216 | struct hlist_head *hp = stripe_hash(conf, sh->sector); |
1da177e4 | 217 | |
45b4233c DW |
218 | pr_debug("insert_hash(), stripe %llu\n", |
219 | (unsigned long long)sh->sector); | |
1da177e4 LT |
220 | |
221 | CHECK_DEVLOCK(); | |
fccddba0 | 222 | hlist_add_head(&sh->hash, hp); |
1da177e4 LT |
223 | } |
224 | ||
225 | ||
226 | /* find an idle stripe, make sure it is unhashed, and return it. */ | |
227 | static struct stripe_head *get_free_stripe(raid5_conf_t *conf) | |
228 | { | |
229 | struct stripe_head *sh = NULL; | |
230 | struct list_head *first; | |
231 | ||
232 | CHECK_DEVLOCK(); | |
233 | if (list_empty(&conf->inactive_list)) | |
234 | goto out; | |
235 | first = conf->inactive_list.next; | |
236 | sh = list_entry(first, struct stripe_head, lru); | |
237 | list_del_init(first); | |
238 | remove_hash(sh); | |
239 | atomic_inc(&conf->active_stripes); | |
240 | out: | |
241 | return sh; | |
242 | } | |
243 | ||
244 | static void shrink_buffers(struct stripe_head *sh, int num) | |
245 | { | |
246 | struct page *p; | |
247 | int i; | |
248 | ||
249 | for (i=0; i<num ; i++) { | |
250 | p = sh->dev[i].page; | |
251 | if (!p) | |
252 | continue; | |
253 | sh->dev[i].page = NULL; | |
2d1f3b5d | 254 | put_page(p); |
1da177e4 LT |
255 | } |
256 | } | |
257 | ||
258 | static int grow_buffers(struct stripe_head *sh, int num) | |
259 | { | |
260 | int i; | |
261 | ||
262 | for (i=0; i<num; i++) { | |
263 | struct page *page; | |
264 | ||
265 | if (!(page = alloc_page(GFP_KERNEL))) { | |
266 | return 1; | |
267 | } | |
268 | sh->dev[i].page = page; | |
269 | } | |
270 | return 0; | |
271 | } | |
272 | ||
d710e138 | 273 | static void raid5_build_block(struct stripe_head *sh, int i); |
1da177e4 | 274 | |
7ecaa1e6 | 275 | static void init_stripe(struct stripe_head *sh, sector_t sector, int pd_idx, int disks) |
1da177e4 LT |
276 | { |
277 | raid5_conf_t *conf = sh->raid_conf; | |
7ecaa1e6 | 278 | int i; |
1da177e4 | 279 | |
78bafebd ES |
280 | BUG_ON(atomic_read(&sh->count) != 0); |
281 | BUG_ON(test_bit(STRIPE_HANDLE, &sh->state)); | |
600aa109 | 282 | BUG_ON(stripe_operations_active(sh)); |
d84e0f10 | 283 | |
1da177e4 | 284 | CHECK_DEVLOCK(); |
45b4233c | 285 | pr_debug("init_stripe called, stripe %llu\n", |
1da177e4 LT |
286 | (unsigned long long)sh->sector); |
287 | ||
288 | remove_hash(sh); | |
16a53ecc | 289 | |
1da177e4 LT |
290 | sh->sector = sector; |
291 | sh->pd_idx = pd_idx; | |
292 | sh->state = 0; | |
293 | ||
7ecaa1e6 N |
294 | sh->disks = disks; |
295 | ||
296 | for (i = sh->disks; i--; ) { | |
1da177e4 LT |
297 | struct r5dev *dev = &sh->dev[i]; |
298 | ||
d84e0f10 | 299 | if (dev->toread || dev->read || dev->towrite || dev->written || |
1da177e4 | 300 | test_bit(R5_LOCKED, &dev->flags)) { |
d84e0f10 | 301 | printk(KERN_ERR "sector=%llx i=%d %p %p %p %p %d\n", |
1da177e4 | 302 | (unsigned long long)sh->sector, i, dev->toread, |
d84e0f10 | 303 | dev->read, dev->towrite, dev->written, |
1da177e4 LT |
304 | test_bit(R5_LOCKED, &dev->flags)); |
305 | BUG(); | |
306 | } | |
307 | dev->flags = 0; | |
308 | raid5_build_block(sh, i); | |
309 | } | |
310 | insert_hash(conf, sh); | |
311 | } | |
312 | ||
7ecaa1e6 | 313 | static struct stripe_head *__find_stripe(raid5_conf_t *conf, sector_t sector, int disks) |
1da177e4 LT |
314 | { |
315 | struct stripe_head *sh; | |
fccddba0 | 316 | struct hlist_node *hn; |
1da177e4 LT |
317 | |
318 | CHECK_DEVLOCK(); | |
45b4233c | 319 | pr_debug("__find_stripe, sector %llu\n", (unsigned long long)sector); |
fccddba0 | 320 | hlist_for_each_entry(sh, hn, stripe_hash(conf, sector), hash) |
7ecaa1e6 | 321 | if (sh->sector == sector && sh->disks == disks) |
1da177e4 | 322 | return sh; |
45b4233c | 323 | pr_debug("__stripe %llu not in cache\n", (unsigned long long)sector); |
1da177e4 LT |
324 | return NULL; |
325 | } | |
326 | ||
327 | static void unplug_slaves(mddev_t *mddev); | |
165125e1 | 328 | static void raid5_unplug_device(struct request_queue *q); |
1da177e4 | 329 | |
7ecaa1e6 N |
330 | static struct stripe_head *get_active_stripe(raid5_conf_t *conf, sector_t sector, int disks, |
331 | int pd_idx, int noblock) | |
1da177e4 LT |
332 | { |
333 | struct stripe_head *sh; | |
334 | ||
45b4233c | 335 | pr_debug("get_stripe, sector %llu\n", (unsigned long long)sector); |
1da177e4 LT |
336 | |
337 | spin_lock_irq(&conf->device_lock); | |
338 | ||
339 | do { | |
72626685 N |
340 | wait_event_lock_irq(conf->wait_for_stripe, |
341 | conf->quiesce == 0, | |
342 | conf->device_lock, /* nothing */); | |
7ecaa1e6 | 343 | sh = __find_stripe(conf, sector, disks); |
1da177e4 LT |
344 | if (!sh) { |
345 | if (!conf->inactive_blocked) | |
346 | sh = get_free_stripe(conf); | |
347 | if (noblock && sh == NULL) | |
348 | break; | |
349 | if (!sh) { | |
350 | conf->inactive_blocked = 1; | |
351 | wait_event_lock_irq(conf->wait_for_stripe, | |
352 | !list_empty(&conf->inactive_list) && | |
5036805b N |
353 | (atomic_read(&conf->active_stripes) |
354 | < (conf->max_nr_stripes *3/4) | |
1da177e4 LT |
355 | || !conf->inactive_blocked), |
356 | conf->device_lock, | |
f4370781 | 357 | raid5_unplug_device(conf->mddev->queue) |
1da177e4 LT |
358 | ); |
359 | conf->inactive_blocked = 0; | |
360 | } else | |
7ecaa1e6 | 361 | init_stripe(sh, sector, pd_idx, disks); |
1da177e4 LT |
362 | } else { |
363 | if (atomic_read(&sh->count)) { | |
78bafebd | 364 | BUG_ON(!list_empty(&sh->lru)); |
1da177e4 LT |
365 | } else { |
366 | if (!test_bit(STRIPE_HANDLE, &sh->state)) | |
367 | atomic_inc(&conf->active_stripes); | |
ff4e8d9a N |
368 | if (list_empty(&sh->lru) && |
369 | !test_bit(STRIPE_EXPANDING, &sh->state)) | |
16a53ecc N |
370 | BUG(); |
371 | list_del_init(&sh->lru); | |
1da177e4 LT |
372 | } |
373 | } | |
374 | } while (sh == NULL); | |
375 | ||
376 | if (sh) | |
377 | atomic_inc(&sh->count); | |
378 | ||
379 | spin_unlock_irq(&conf->device_lock); | |
380 | return sh; | |
381 | } | |
382 | ||
6712ecf8 N |
383 | static void |
384 | raid5_end_read_request(struct bio *bi, int error); | |
385 | static void | |
386 | raid5_end_write_request(struct bio *bi, int error); | |
91c00924 | 387 | |
c4e5ac0a | 388 | static void ops_run_io(struct stripe_head *sh, struct stripe_head_state *s) |
91c00924 DW |
389 | { |
390 | raid5_conf_t *conf = sh->raid_conf; | |
391 | int i, disks = sh->disks; | |
392 | ||
393 | might_sleep(); | |
394 | ||
395 | for (i = disks; i--; ) { | |
396 | int rw; | |
397 | struct bio *bi; | |
398 | mdk_rdev_t *rdev; | |
399 | if (test_and_clear_bit(R5_Wantwrite, &sh->dev[i].flags)) | |
400 | rw = WRITE; | |
401 | else if (test_and_clear_bit(R5_Wantread, &sh->dev[i].flags)) | |
402 | rw = READ; | |
403 | else | |
404 | continue; | |
405 | ||
406 | bi = &sh->dev[i].req; | |
407 | ||
408 | bi->bi_rw = rw; | |
409 | if (rw == WRITE) | |
410 | bi->bi_end_io = raid5_end_write_request; | |
411 | else | |
412 | bi->bi_end_io = raid5_end_read_request; | |
413 | ||
414 | rcu_read_lock(); | |
415 | rdev = rcu_dereference(conf->disks[i].rdev); | |
416 | if (rdev && test_bit(Faulty, &rdev->flags)) | |
417 | rdev = NULL; | |
418 | if (rdev) | |
419 | atomic_inc(&rdev->nr_pending); | |
420 | rcu_read_unlock(); | |
421 | ||
422 | if (rdev) { | |
c4e5ac0a | 423 | if (s->syncing || s->expanding || s->expanded) |
91c00924 DW |
424 | md_sync_acct(rdev->bdev, STRIPE_SECTORS); |
425 | ||
2b7497f0 DW |
426 | set_bit(STRIPE_IO_STARTED, &sh->state); |
427 | ||
91c00924 DW |
428 | bi->bi_bdev = rdev->bdev; |
429 | pr_debug("%s: for %llu schedule op %ld on disc %d\n", | |
e46b272b | 430 | __func__, (unsigned long long)sh->sector, |
91c00924 DW |
431 | bi->bi_rw, i); |
432 | atomic_inc(&sh->count); | |
433 | bi->bi_sector = sh->sector + rdev->data_offset; | |
434 | bi->bi_flags = 1 << BIO_UPTODATE; | |
435 | bi->bi_vcnt = 1; | |
436 | bi->bi_max_vecs = 1; | |
437 | bi->bi_idx = 0; | |
438 | bi->bi_io_vec = &sh->dev[i].vec; | |
439 | bi->bi_io_vec[0].bv_len = STRIPE_SIZE; | |
440 | bi->bi_io_vec[0].bv_offset = 0; | |
441 | bi->bi_size = STRIPE_SIZE; | |
442 | bi->bi_next = NULL; | |
443 | if (rw == WRITE && | |
444 | test_bit(R5_ReWrite, &sh->dev[i].flags)) | |
445 | atomic_add(STRIPE_SECTORS, | |
446 | &rdev->corrected_errors); | |
447 | generic_make_request(bi); | |
448 | } else { | |
449 | if (rw == WRITE) | |
450 | set_bit(STRIPE_DEGRADED, &sh->state); | |
451 | pr_debug("skip op %ld on disc %d for sector %llu\n", | |
452 | bi->bi_rw, i, (unsigned long long)sh->sector); | |
453 | clear_bit(R5_LOCKED, &sh->dev[i].flags); | |
454 | set_bit(STRIPE_HANDLE, &sh->state); | |
455 | } | |
456 | } | |
457 | } | |
458 | ||
459 | static struct dma_async_tx_descriptor * | |
460 | async_copy_data(int frombio, struct bio *bio, struct page *page, | |
461 | sector_t sector, struct dma_async_tx_descriptor *tx) | |
462 | { | |
463 | struct bio_vec *bvl; | |
464 | struct page *bio_page; | |
465 | int i; | |
466 | int page_offset; | |
467 | ||
468 | if (bio->bi_sector >= sector) | |
469 | page_offset = (signed)(bio->bi_sector - sector) * 512; | |
470 | else | |
471 | page_offset = (signed)(sector - bio->bi_sector) * -512; | |
472 | bio_for_each_segment(bvl, bio, i) { | |
473 | int len = bio_iovec_idx(bio, i)->bv_len; | |
474 | int clen; | |
475 | int b_offset = 0; | |
476 | ||
477 | if (page_offset < 0) { | |
478 | b_offset = -page_offset; | |
479 | page_offset += b_offset; | |
480 | len -= b_offset; | |
481 | } | |
482 | ||
483 | if (len > 0 && page_offset + len > STRIPE_SIZE) | |
484 | clen = STRIPE_SIZE - page_offset; | |
485 | else | |
486 | clen = len; | |
487 | ||
488 | if (clen > 0) { | |
489 | b_offset += bio_iovec_idx(bio, i)->bv_offset; | |
490 | bio_page = bio_iovec_idx(bio, i)->bv_page; | |
491 | if (frombio) | |
492 | tx = async_memcpy(page, bio_page, page_offset, | |
493 | b_offset, clen, | |
eb0645a8 | 494 | ASYNC_TX_DEP_ACK, |
91c00924 DW |
495 | tx, NULL, NULL); |
496 | else | |
497 | tx = async_memcpy(bio_page, page, b_offset, | |
498 | page_offset, clen, | |
eb0645a8 | 499 | ASYNC_TX_DEP_ACK, |
91c00924 DW |
500 | tx, NULL, NULL); |
501 | } | |
502 | if (clen < len) /* hit end of page */ | |
503 | break; | |
504 | page_offset += len; | |
505 | } | |
506 | ||
507 | return tx; | |
508 | } | |
509 | ||
510 | static void ops_complete_biofill(void *stripe_head_ref) | |
511 | { | |
512 | struct stripe_head *sh = stripe_head_ref; | |
513 | struct bio *return_bi = NULL; | |
514 | raid5_conf_t *conf = sh->raid_conf; | |
e4d84909 | 515 | int i; |
91c00924 | 516 | |
e46b272b | 517 | pr_debug("%s: stripe %llu\n", __func__, |
91c00924 DW |
518 | (unsigned long long)sh->sector); |
519 | ||
520 | /* clear completed biofills */ | |
83de75cc | 521 | spin_lock_irq(&conf->device_lock); |
91c00924 DW |
522 | for (i = sh->disks; i--; ) { |
523 | struct r5dev *dev = &sh->dev[i]; | |
91c00924 DW |
524 | |
525 | /* acknowledge completion of a biofill operation */ | |
e4d84909 DW |
526 | /* and check if we need to reply to a read request, |
527 | * new R5_Wantfill requests are held off until | |
83de75cc | 528 | * !STRIPE_BIOFILL_RUN |
e4d84909 DW |
529 | */ |
530 | if (test_and_clear_bit(R5_Wantfill, &dev->flags)) { | |
91c00924 | 531 | struct bio *rbi, *rbi2; |
91c00924 | 532 | |
91c00924 DW |
533 | BUG_ON(!dev->read); |
534 | rbi = dev->read; | |
535 | dev->read = NULL; | |
536 | while (rbi && rbi->bi_sector < | |
537 | dev->sector + STRIPE_SECTORS) { | |
538 | rbi2 = r5_next_bio(rbi, dev->sector); | |
960e739d | 539 | if (!raid5_dec_bi_phys_segments(rbi)) { |
91c00924 DW |
540 | rbi->bi_next = return_bi; |
541 | return_bi = rbi; | |
542 | } | |
91c00924 DW |
543 | rbi = rbi2; |
544 | } | |
545 | } | |
546 | } | |
83de75cc DW |
547 | spin_unlock_irq(&conf->device_lock); |
548 | clear_bit(STRIPE_BIOFILL_RUN, &sh->state); | |
91c00924 DW |
549 | |
550 | return_io(return_bi); | |
551 | ||
e4d84909 | 552 | set_bit(STRIPE_HANDLE, &sh->state); |
91c00924 DW |
553 | release_stripe(sh); |
554 | } | |
555 | ||
556 | static void ops_run_biofill(struct stripe_head *sh) | |
557 | { | |
558 | struct dma_async_tx_descriptor *tx = NULL; | |
559 | raid5_conf_t *conf = sh->raid_conf; | |
560 | int i; | |
561 | ||
e46b272b | 562 | pr_debug("%s: stripe %llu\n", __func__, |
91c00924 DW |
563 | (unsigned long long)sh->sector); |
564 | ||
565 | for (i = sh->disks; i--; ) { | |
566 | struct r5dev *dev = &sh->dev[i]; | |
567 | if (test_bit(R5_Wantfill, &dev->flags)) { | |
568 | struct bio *rbi; | |
569 | spin_lock_irq(&conf->device_lock); | |
570 | dev->read = rbi = dev->toread; | |
571 | dev->toread = NULL; | |
572 | spin_unlock_irq(&conf->device_lock); | |
573 | while (rbi && rbi->bi_sector < | |
574 | dev->sector + STRIPE_SECTORS) { | |
575 | tx = async_copy_data(0, rbi, dev->page, | |
576 | dev->sector, tx); | |
577 | rbi = r5_next_bio(rbi, dev->sector); | |
578 | } | |
579 | } | |
580 | } | |
581 | ||
582 | atomic_inc(&sh->count); | |
583 | async_trigger_callback(ASYNC_TX_DEP_ACK | ASYNC_TX_ACK, tx, | |
584 | ops_complete_biofill, sh); | |
585 | } | |
586 | ||
587 | static void ops_complete_compute5(void *stripe_head_ref) | |
588 | { | |
589 | struct stripe_head *sh = stripe_head_ref; | |
590 | int target = sh->ops.target; | |
591 | struct r5dev *tgt = &sh->dev[target]; | |
592 | ||
e46b272b | 593 | pr_debug("%s: stripe %llu\n", __func__, |
91c00924 DW |
594 | (unsigned long long)sh->sector); |
595 | ||
596 | set_bit(R5_UPTODATE, &tgt->flags); | |
597 | BUG_ON(!test_bit(R5_Wantcompute, &tgt->flags)); | |
598 | clear_bit(R5_Wantcompute, &tgt->flags); | |
ecc65c9b DW |
599 | clear_bit(STRIPE_COMPUTE_RUN, &sh->state); |
600 | if (sh->check_state == check_state_compute_run) | |
601 | sh->check_state = check_state_compute_result; | |
91c00924 DW |
602 | set_bit(STRIPE_HANDLE, &sh->state); |
603 | release_stripe(sh); | |
604 | } | |
605 | ||
7b3a871e | 606 | static struct dma_async_tx_descriptor *ops_run_compute5(struct stripe_head *sh) |
91c00924 DW |
607 | { |
608 | /* kernel stack size limits the total number of disks */ | |
609 | int disks = sh->disks; | |
610 | struct page *xor_srcs[disks]; | |
611 | int target = sh->ops.target; | |
612 | struct r5dev *tgt = &sh->dev[target]; | |
613 | struct page *xor_dest = tgt->page; | |
614 | int count = 0; | |
615 | struct dma_async_tx_descriptor *tx; | |
616 | int i; | |
617 | ||
618 | pr_debug("%s: stripe %llu block: %d\n", | |
e46b272b | 619 | __func__, (unsigned long long)sh->sector, target); |
91c00924 DW |
620 | BUG_ON(!test_bit(R5_Wantcompute, &tgt->flags)); |
621 | ||
622 | for (i = disks; i--; ) | |
623 | if (i != target) | |
624 | xor_srcs[count++] = sh->dev[i].page; | |
625 | ||
626 | atomic_inc(&sh->count); | |
627 | ||
628 | if (unlikely(count == 1)) | |
629 | tx = async_memcpy(xor_dest, xor_srcs[0], 0, 0, STRIPE_SIZE, | |
630 | 0, NULL, ops_complete_compute5, sh); | |
631 | else | |
632 | tx = async_xor(xor_dest, xor_srcs, 0, count, STRIPE_SIZE, | |
633 | ASYNC_TX_XOR_ZERO_DST, NULL, | |
634 | ops_complete_compute5, sh); | |
635 | ||
91c00924 DW |
636 | return tx; |
637 | } | |
638 | ||
639 | static void ops_complete_prexor(void *stripe_head_ref) | |
640 | { | |
641 | struct stripe_head *sh = stripe_head_ref; | |
642 | ||
e46b272b | 643 | pr_debug("%s: stripe %llu\n", __func__, |
91c00924 | 644 | (unsigned long long)sh->sector); |
91c00924 DW |
645 | } |
646 | ||
647 | static struct dma_async_tx_descriptor * | |
648 | ops_run_prexor(struct stripe_head *sh, struct dma_async_tx_descriptor *tx) | |
649 | { | |
650 | /* kernel stack size limits the total number of disks */ | |
651 | int disks = sh->disks; | |
652 | struct page *xor_srcs[disks]; | |
653 | int count = 0, pd_idx = sh->pd_idx, i; | |
654 | ||
655 | /* existing parity data subtracted */ | |
656 | struct page *xor_dest = xor_srcs[count++] = sh->dev[pd_idx].page; | |
657 | ||
e46b272b | 658 | pr_debug("%s: stripe %llu\n", __func__, |
91c00924 DW |
659 | (unsigned long long)sh->sector); |
660 | ||
661 | for (i = disks; i--; ) { | |
662 | struct r5dev *dev = &sh->dev[i]; | |
663 | /* Only process blocks that are known to be uptodate */ | |
d8ee0728 | 664 | if (test_bit(R5_Wantdrain, &dev->flags)) |
91c00924 DW |
665 | xor_srcs[count++] = dev->page; |
666 | } | |
667 | ||
668 | tx = async_xor(xor_dest, xor_srcs, 0, count, STRIPE_SIZE, | |
669 | ASYNC_TX_DEP_ACK | ASYNC_TX_XOR_DROP_DST, tx, | |
670 | ops_complete_prexor, sh); | |
671 | ||
672 | return tx; | |
673 | } | |
674 | ||
675 | static struct dma_async_tx_descriptor * | |
d8ee0728 | 676 | ops_run_biodrain(struct stripe_head *sh, struct dma_async_tx_descriptor *tx) |
91c00924 DW |
677 | { |
678 | int disks = sh->disks; | |
d8ee0728 | 679 | int i; |
91c00924 | 680 | |
e46b272b | 681 | pr_debug("%s: stripe %llu\n", __func__, |
91c00924 DW |
682 | (unsigned long long)sh->sector); |
683 | ||
684 | for (i = disks; i--; ) { | |
685 | struct r5dev *dev = &sh->dev[i]; | |
686 | struct bio *chosen; | |
91c00924 | 687 | |
d8ee0728 | 688 | if (test_and_clear_bit(R5_Wantdrain, &dev->flags)) { |
91c00924 DW |
689 | struct bio *wbi; |
690 | ||
691 | spin_lock(&sh->lock); | |
692 | chosen = dev->towrite; | |
693 | dev->towrite = NULL; | |
694 | BUG_ON(dev->written); | |
695 | wbi = dev->written = chosen; | |
696 | spin_unlock(&sh->lock); | |
697 | ||
698 | while (wbi && wbi->bi_sector < | |
699 | dev->sector + STRIPE_SECTORS) { | |
700 | tx = async_copy_data(1, wbi, dev->page, | |
701 | dev->sector, tx); | |
702 | wbi = r5_next_bio(wbi, dev->sector); | |
703 | } | |
704 | } | |
705 | } | |
706 | ||
707 | return tx; | |
708 | } | |
709 | ||
710 | static void ops_complete_postxor(void *stripe_head_ref) | |
91c00924 DW |
711 | { |
712 | struct stripe_head *sh = stripe_head_ref; | |
713 | int disks = sh->disks, i, pd_idx = sh->pd_idx; | |
714 | ||
e46b272b | 715 | pr_debug("%s: stripe %llu\n", __func__, |
91c00924 DW |
716 | (unsigned long long)sh->sector); |
717 | ||
718 | for (i = disks; i--; ) { | |
719 | struct r5dev *dev = &sh->dev[i]; | |
720 | if (dev->written || i == pd_idx) | |
721 | set_bit(R5_UPTODATE, &dev->flags); | |
722 | } | |
723 | ||
d8ee0728 DW |
724 | if (sh->reconstruct_state == reconstruct_state_drain_run) |
725 | sh->reconstruct_state = reconstruct_state_drain_result; | |
726 | else if (sh->reconstruct_state == reconstruct_state_prexor_drain_run) | |
727 | sh->reconstruct_state = reconstruct_state_prexor_drain_result; | |
728 | else { | |
729 | BUG_ON(sh->reconstruct_state != reconstruct_state_run); | |
730 | sh->reconstruct_state = reconstruct_state_result; | |
731 | } | |
91c00924 DW |
732 | |
733 | set_bit(STRIPE_HANDLE, &sh->state); | |
734 | release_stripe(sh); | |
735 | } | |
736 | ||
737 | static void | |
d8ee0728 | 738 | ops_run_postxor(struct stripe_head *sh, struct dma_async_tx_descriptor *tx) |
91c00924 DW |
739 | { |
740 | /* kernel stack size limits the total number of disks */ | |
741 | int disks = sh->disks; | |
742 | struct page *xor_srcs[disks]; | |
743 | ||
744 | int count = 0, pd_idx = sh->pd_idx, i; | |
745 | struct page *xor_dest; | |
d8ee0728 | 746 | int prexor = 0; |
91c00924 | 747 | unsigned long flags; |
91c00924 | 748 | |
e46b272b | 749 | pr_debug("%s: stripe %llu\n", __func__, |
91c00924 DW |
750 | (unsigned long long)sh->sector); |
751 | ||
752 | /* check if prexor is active which means only process blocks | |
753 | * that are part of a read-modify-write (written) | |
754 | */ | |
d8ee0728 DW |
755 | if (sh->reconstruct_state == reconstruct_state_prexor_drain_run) { |
756 | prexor = 1; | |
91c00924 DW |
757 | xor_dest = xor_srcs[count++] = sh->dev[pd_idx].page; |
758 | for (i = disks; i--; ) { | |
759 | struct r5dev *dev = &sh->dev[i]; | |
760 | if (dev->written) | |
761 | xor_srcs[count++] = dev->page; | |
762 | } | |
763 | } else { | |
764 | xor_dest = sh->dev[pd_idx].page; | |
765 | for (i = disks; i--; ) { | |
766 | struct r5dev *dev = &sh->dev[i]; | |
767 | if (i != pd_idx) | |
768 | xor_srcs[count++] = dev->page; | |
769 | } | |
770 | } | |
771 | ||
91c00924 DW |
772 | /* 1/ if we prexor'd then the dest is reused as a source |
773 | * 2/ if we did not prexor then we are redoing the parity | |
774 | * set ASYNC_TX_XOR_DROP_DST and ASYNC_TX_XOR_ZERO_DST | |
775 | * for the synchronous xor case | |
776 | */ | |
777 | flags = ASYNC_TX_DEP_ACK | ASYNC_TX_ACK | | |
778 | (prexor ? ASYNC_TX_XOR_DROP_DST : ASYNC_TX_XOR_ZERO_DST); | |
779 | ||
780 | atomic_inc(&sh->count); | |
781 | ||
782 | if (unlikely(count == 1)) { | |
783 | flags &= ~(ASYNC_TX_XOR_DROP_DST | ASYNC_TX_XOR_ZERO_DST); | |
784 | tx = async_memcpy(xor_dest, xor_srcs[0], 0, 0, STRIPE_SIZE, | |
d8ee0728 | 785 | flags, tx, ops_complete_postxor, sh); |
91c00924 DW |
786 | } else |
787 | tx = async_xor(xor_dest, xor_srcs, 0, count, STRIPE_SIZE, | |
d8ee0728 | 788 | flags, tx, ops_complete_postxor, sh); |
91c00924 DW |
789 | } |
790 | ||
791 | static void ops_complete_check(void *stripe_head_ref) | |
792 | { | |
793 | struct stripe_head *sh = stripe_head_ref; | |
91c00924 | 794 | |
e46b272b | 795 | pr_debug("%s: stripe %llu\n", __func__, |
91c00924 DW |
796 | (unsigned long long)sh->sector); |
797 | ||
ecc65c9b | 798 | sh->check_state = check_state_check_result; |
91c00924 DW |
799 | set_bit(STRIPE_HANDLE, &sh->state); |
800 | release_stripe(sh); | |
801 | } | |
802 | ||
803 | static void ops_run_check(struct stripe_head *sh) | |
804 | { | |
805 | /* kernel stack size limits the total number of disks */ | |
806 | int disks = sh->disks; | |
807 | struct page *xor_srcs[disks]; | |
808 | struct dma_async_tx_descriptor *tx; | |
809 | ||
810 | int count = 0, pd_idx = sh->pd_idx, i; | |
811 | struct page *xor_dest = xor_srcs[count++] = sh->dev[pd_idx].page; | |
812 | ||
e46b272b | 813 | pr_debug("%s: stripe %llu\n", __func__, |
91c00924 DW |
814 | (unsigned long long)sh->sector); |
815 | ||
816 | for (i = disks; i--; ) { | |
817 | struct r5dev *dev = &sh->dev[i]; | |
818 | if (i != pd_idx) | |
819 | xor_srcs[count++] = dev->page; | |
820 | } | |
821 | ||
822 | tx = async_xor_zero_sum(xor_dest, xor_srcs, 0, count, STRIPE_SIZE, | |
823 | &sh->ops.zero_sum_result, 0, NULL, NULL, NULL); | |
824 | ||
91c00924 DW |
825 | atomic_inc(&sh->count); |
826 | tx = async_trigger_callback(ASYNC_TX_DEP_ACK | ASYNC_TX_ACK, tx, | |
827 | ops_complete_check, sh); | |
828 | } | |
829 | ||
600aa109 | 830 | static void raid5_run_ops(struct stripe_head *sh, unsigned long ops_request) |
91c00924 DW |
831 | { |
832 | int overlap_clear = 0, i, disks = sh->disks; | |
833 | struct dma_async_tx_descriptor *tx = NULL; | |
834 | ||
83de75cc | 835 | if (test_bit(STRIPE_OP_BIOFILL, &ops_request)) { |
91c00924 DW |
836 | ops_run_biofill(sh); |
837 | overlap_clear++; | |
838 | } | |
839 | ||
7b3a871e DW |
840 | if (test_bit(STRIPE_OP_COMPUTE_BLK, &ops_request)) { |
841 | tx = ops_run_compute5(sh); | |
842 | /* terminate the chain if postxor is not set to be run */ | |
843 | if (tx && !test_bit(STRIPE_OP_POSTXOR, &ops_request)) | |
844 | async_tx_ack(tx); | |
845 | } | |
91c00924 | 846 | |
600aa109 | 847 | if (test_bit(STRIPE_OP_PREXOR, &ops_request)) |
91c00924 DW |
848 | tx = ops_run_prexor(sh, tx); |
849 | ||
600aa109 | 850 | if (test_bit(STRIPE_OP_BIODRAIN, &ops_request)) { |
d8ee0728 | 851 | tx = ops_run_biodrain(sh, tx); |
91c00924 DW |
852 | overlap_clear++; |
853 | } | |
854 | ||
600aa109 | 855 | if (test_bit(STRIPE_OP_POSTXOR, &ops_request)) |
d8ee0728 | 856 | ops_run_postxor(sh, tx); |
91c00924 | 857 | |
ecc65c9b | 858 | if (test_bit(STRIPE_OP_CHECK, &ops_request)) |
91c00924 DW |
859 | ops_run_check(sh); |
860 | ||
91c00924 DW |
861 | if (overlap_clear) |
862 | for (i = disks; i--; ) { | |
863 | struct r5dev *dev = &sh->dev[i]; | |
864 | if (test_and_clear_bit(R5_Overlap, &dev->flags)) | |
865 | wake_up(&sh->raid_conf->wait_for_overlap); | |
866 | } | |
867 | } | |
868 | ||
3f294f4f | 869 | static int grow_one_stripe(raid5_conf_t *conf) |
1da177e4 LT |
870 | { |
871 | struct stripe_head *sh; | |
3f294f4f N |
872 | sh = kmem_cache_alloc(conf->slab_cache, GFP_KERNEL); |
873 | if (!sh) | |
874 | return 0; | |
875 | memset(sh, 0, sizeof(*sh) + (conf->raid_disks-1)*sizeof(struct r5dev)); | |
876 | sh->raid_conf = conf; | |
877 | spin_lock_init(&sh->lock); | |
878 | ||
879 | if (grow_buffers(sh, conf->raid_disks)) { | |
880 | shrink_buffers(sh, conf->raid_disks); | |
881 | kmem_cache_free(conf->slab_cache, sh); | |
882 | return 0; | |
883 | } | |
7ecaa1e6 | 884 | sh->disks = conf->raid_disks; |
3f294f4f N |
885 | /* we just created an active stripe so... */ |
886 | atomic_set(&sh->count, 1); | |
887 | atomic_inc(&conf->active_stripes); | |
888 | INIT_LIST_HEAD(&sh->lru); | |
889 | release_stripe(sh); | |
890 | return 1; | |
891 | } | |
892 | ||
893 | static int grow_stripes(raid5_conf_t *conf, int num) | |
894 | { | |
e18b890b | 895 | struct kmem_cache *sc; |
1da177e4 LT |
896 | int devs = conf->raid_disks; |
897 | ||
42b9bebe N |
898 | sprintf(conf->cache_name[0], "raid5-%s", mdname(conf->mddev)); |
899 | sprintf(conf->cache_name[1], "raid5-%s-alt", mdname(conf->mddev)); | |
ad01c9e3 N |
900 | conf->active_name = 0; |
901 | sc = kmem_cache_create(conf->cache_name[conf->active_name], | |
1da177e4 | 902 | sizeof(struct stripe_head)+(devs-1)*sizeof(struct r5dev), |
20c2df83 | 903 | 0, 0, NULL); |
1da177e4 LT |
904 | if (!sc) |
905 | return 1; | |
906 | conf->slab_cache = sc; | |
ad01c9e3 | 907 | conf->pool_size = devs; |
16a53ecc | 908 | while (num--) |
3f294f4f | 909 | if (!grow_one_stripe(conf)) |
1da177e4 | 910 | return 1; |
1da177e4 LT |
911 | return 0; |
912 | } | |
29269553 N |
913 | |
914 | #ifdef CONFIG_MD_RAID5_RESHAPE | |
ad01c9e3 N |
915 | static int resize_stripes(raid5_conf_t *conf, int newsize) |
916 | { | |
917 | /* Make all the stripes able to hold 'newsize' devices. | |
918 | * New slots in each stripe get 'page' set to a new page. | |
919 | * | |
920 | * This happens in stages: | |
921 | * 1/ create a new kmem_cache and allocate the required number of | |
922 | * stripe_heads. | |
923 | * 2/ gather all the old stripe_heads and tranfer the pages across | |
924 | * to the new stripe_heads. This will have the side effect of | |
925 | * freezing the array as once all stripe_heads have been collected, | |
926 | * no IO will be possible. Old stripe heads are freed once their | |
927 | * pages have been transferred over, and the old kmem_cache is | |
928 | * freed when all stripes are done. | |
929 | * 3/ reallocate conf->disks to be suitable bigger. If this fails, | |
930 | * we simple return a failre status - no need to clean anything up. | |
931 | * 4/ allocate new pages for the new slots in the new stripe_heads. | |
932 | * If this fails, we don't bother trying the shrink the | |
933 | * stripe_heads down again, we just leave them as they are. | |
934 | * As each stripe_head is processed the new one is released into | |
935 | * active service. | |
936 | * | |
937 | * Once step2 is started, we cannot afford to wait for a write, | |
938 | * so we use GFP_NOIO allocations. | |
939 | */ | |
940 | struct stripe_head *osh, *nsh; | |
941 | LIST_HEAD(newstripes); | |
942 | struct disk_info *ndisks; | |
b5470dc5 | 943 | int err; |
e18b890b | 944 | struct kmem_cache *sc; |
ad01c9e3 N |
945 | int i; |
946 | ||
947 | if (newsize <= conf->pool_size) | |
948 | return 0; /* never bother to shrink */ | |
949 | ||
b5470dc5 DW |
950 | err = md_allow_write(conf->mddev); |
951 | if (err) | |
952 | return err; | |
2a2275d6 | 953 | |
ad01c9e3 N |
954 | /* Step 1 */ |
955 | sc = kmem_cache_create(conf->cache_name[1-conf->active_name], | |
956 | sizeof(struct stripe_head)+(newsize-1)*sizeof(struct r5dev), | |
20c2df83 | 957 | 0, 0, NULL); |
ad01c9e3 N |
958 | if (!sc) |
959 | return -ENOMEM; | |
960 | ||
961 | for (i = conf->max_nr_stripes; i; i--) { | |
962 | nsh = kmem_cache_alloc(sc, GFP_KERNEL); | |
963 | if (!nsh) | |
964 | break; | |
965 | ||
966 | memset(nsh, 0, sizeof(*nsh) + (newsize-1)*sizeof(struct r5dev)); | |
967 | ||
968 | nsh->raid_conf = conf; | |
969 | spin_lock_init(&nsh->lock); | |
970 | ||
971 | list_add(&nsh->lru, &newstripes); | |
972 | } | |
973 | if (i) { | |
974 | /* didn't get enough, give up */ | |
975 | while (!list_empty(&newstripes)) { | |
976 | nsh = list_entry(newstripes.next, struct stripe_head, lru); | |
977 | list_del(&nsh->lru); | |
978 | kmem_cache_free(sc, nsh); | |
979 | } | |
980 | kmem_cache_destroy(sc); | |
981 | return -ENOMEM; | |
982 | } | |
983 | /* Step 2 - Must use GFP_NOIO now. | |
984 | * OK, we have enough stripes, start collecting inactive | |
985 | * stripes and copying them over | |
986 | */ | |
987 | list_for_each_entry(nsh, &newstripes, lru) { | |
988 | spin_lock_irq(&conf->device_lock); | |
989 | wait_event_lock_irq(conf->wait_for_stripe, | |
990 | !list_empty(&conf->inactive_list), | |
991 | conf->device_lock, | |
b3b46be3 | 992 | unplug_slaves(conf->mddev) |
ad01c9e3 N |
993 | ); |
994 | osh = get_free_stripe(conf); | |
995 | spin_unlock_irq(&conf->device_lock); | |
996 | atomic_set(&nsh->count, 1); | |
997 | for(i=0; i<conf->pool_size; i++) | |
998 | nsh->dev[i].page = osh->dev[i].page; | |
999 | for( ; i<newsize; i++) | |
1000 | nsh->dev[i].page = NULL; | |
1001 | kmem_cache_free(conf->slab_cache, osh); | |
1002 | } | |
1003 | kmem_cache_destroy(conf->slab_cache); | |
1004 | ||
1005 | /* Step 3. | |
1006 | * At this point, we are holding all the stripes so the array | |
1007 | * is completely stalled, so now is a good time to resize | |
1008 | * conf->disks. | |
1009 | */ | |
1010 | ndisks = kzalloc(newsize * sizeof(struct disk_info), GFP_NOIO); | |
1011 | if (ndisks) { | |
1012 | for (i=0; i<conf->raid_disks; i++) | |
1013 | ndisks[i] = conf->disks[i]; | |
1014 | kfree(conf->disks); | |
1015 | conf->disks = ndisks; | |
1016 | } else | |
1017 | err = -ENOMEM; | |
1018 | ||
1019 | /* Step 4, return new stripes to service */ | |
1020 | while(!list_empty(&newstripes)) { | |
1021 | nsh = list_entry(newstripes.next, struct stripe_head, lru); | |
1022 | list_del_init(&nsh->lru); | |
1023 | for (i=conf->raid_disks; i < newsize; i++) | |
1024 | if (nsh->dev[i].page == NULL) { | |
1025 | struct page *p = alloc_page(GFP_NOIO); | |
1026 | nsh->dev[i].page = p; | |
1027 | if (!p) | |
1028 | err = -ENOMEM; | |
1029 | } | |
1030 | release_stripe(nsh); | |
1031 | } | |
1032 | /* critical section pass, GFP_NOIO no longer needed */ | |
1033 | ||
1034 | conf->slab_cache = sc; | |
1035 | conf->active_name = 1-conf->active_name; | |
1036 | conf->pool_size = newsize; | |
1037 | return err; | |
1038 | } | |
29269553 | 1039 | #endif |
1da177e4 | 1040 | |
3f294f4f | 1041 | static int drop_one_stripe(raid5_conf_t *conf) |
1da177e4 LT |
1042 | { |
1043 | struct stripe_head *sh; | |
1044 | ||
3f294f4f N |
1045 | spin_lock_irq(&conf->device_lock); |
1046 | sh = get_free_stripe(conf); | |
1047 | spin_unlock_irq(&conf->device_lock); | |
1048 | if (!sh) | |
1049 | return 0; | |
78bafebd | 1050 | BUG_ON(atomic_read(&sh->count)); |
ad01c9e3 | 1051 | shrink_buffers(sh, conf->pool_size); |
3f294f4f N |
1052 | kmem_cache_free(conf->slab_cache, sh); |
1053 | atomic_dec(&conf->active_stripes); | |
1054 | return 1; | |
1055 | } | |
1056 | ||
1057 | static void shrink_stripes(raid5_conf_t *conf) | |
1058 | { | |
1059 | while (drop_one_stripe(conf)) | |
1060 | ; | |
1061 | ||
29fc7e3e N |
1062 | if (conf->slab_cache) |
1063 | kmem_cache_destroy(conf->slab_cache); | |
1da177e4 LT |
1064 | conf->slab_cache = NULL; |
1065 | } | |
1066 | ||
6712ecf8 | 1067 | static void raid5_end_read_request(struct bio * bi, int error) |
1da177e4 LT |
1068 | { |
1069 | struct stripe_head *sh = bi->bi_private; | |
1070 | raid5_conf_t *conf = sh->raid_conf; | |
7ecaa1e6 | 1071 | int disks = sh->disks, i; |
1da177e4 | 1072 | int uptodate = test_bit(BIO_UPTODATE, &bi->bi_flags); |
d6950432 N |
1073 | char b[BDEVNAME_SIZE]; |
1074 | mdk_rdev_t *rdev; | |
1da177e4 | 1075 | |
1da177e4 LT |
1076 | |
1077 | for (i=0 ; i<disks; i++) | |
1078 | if (bi == &sh->dev[i].req) | |
1079 | break; | |
1080 | ||
45b4233c DW |
1081 | pr_debug("end_read_request %llu/%d, count: %d, uptodate %d.\n", |
1082 | (unsigned long long)sh->sector, i, atomic_read(&sh->count), | |
1da177e4 LT |
1083 | uptodate); |
1084 | if (i == disks) { | |
1085 | BUG(); | |
6712ecf8 | 1086 | return; |
1da177e4 LT |
1087 | } |
1088 | ||
1089 | if (uptodate) { | |
1da177e4 | 1090 | set_bit(R5_UPTODATE, &sh->dev[i].flags); |
4e5314b5 | 1091 | if (test_bit(R5_ReadError, &sh->dev[i].flags)) { |
d6950432 | 1092 | rdev = conf->disks[i].rdev; |
6be9d494 BS |
1093 | printk_rl(KERN_INFO "raid5:%s: read error corrected" |
1094 | " (%lu sectors at %llu on %s)\n", | |
1095 | mdname(conf->mddev), STRIPE_SECTORS, | |
1096 | (unsigned long long)(sh->sector | |
1097 | + rdev->data_offset), | |
1098 | bdevname(rdev->bdev, b)); | |
4e5314b5 N |
1099 | clear_bit(R5_ReadError, &sh->dev[i].flags); |
1100 | clear_bit(R5_ReWrite, &sh->dev[i].flags); | |
1101 | } | |
ba22dcbf N |
1102 | if (atomic_read(&conf->disks[i].rdev->read_errors)) |
1103 | atomic_set(&conf->disks[i].rdev->read_errors, 0); | |
1da177e4 | 1104 | } else { |
d6950432 | 1105 | const char *bdn = bdevname(conf->disks[i].rdev->bdev, b); |
ba22dcbf | 1106 | int retry = 0; |
d6950432 N |
1107 | rdev = conf->disks[i].rdev; |
1108 | ||
1da177e4 | 1109 | clear_bit(R5_UPTODATE, &sh->dev[i].flags); |
d6950432 | 1110 | atomic_inc(&rdev->read_errors); |
ba22dcbf | 1111 | if (conf->mddev->degraded) |
6be9d494 BS |
1112 | printk_rl(KERN_WARNING |
1113 | "raid5:%s: read error not correctable " | |
1114 | "(sector %llu on %s).\n", | |
1115 | mdname(conf->mddev), | |
1116 | (unsigned long long)(sh->sector | |
1117 | + rdev->data_offset), | |
1118 | bdn); | |
ba22dcbf | 1119 | else if (test_bit(R5_ReWrite, &sh->dev[i].flags)) |
4e5314b5 | 1120 | /* Oh, no!!! */ |
6be9d494 BS |
1121 | printk_rl(KERN_WARNING |
1122 | "raid5:%s: read error NOT corrected!! " | |
1123 | "(sector %llu on %s).\n", | |
1124 | mdname(conf->mddev), | |
1125 | (unsigned long long)(sh->sector | |
1126 | + rdev->data_offset), | |
1127 | bdn); | |
d6950432 | 1128 | else if (atomic_read(&rdev->read_errors) |
ba22dcbf | 1129 | > conf->max_nr_stripes) |
14f8d26b | 1130 | printk(KERN_WARNING |
d6950432 N |
1131 | "raid5:%s: Too many read errors, failing device %s.\n", |
1132 | mdname(conf->mddev), bdn); | |
ba22dcbf N |
1133 | else |
1134 | retry = 1; | |
1135 | if (retry) | |
1136 | set_bit(R5_ReadError, &sh->dev[i].flags); | |
1137 | else { | |
4e5314b5 N |
1138 | clear_bit(R5_ReadError, &sh->dev[i].flags); |
1139 | clear_bit(R5_ReWrite, &sh->dev[i].flags); | |
d6950432 | 1140 | md_error(conf->mddev, rdev); |
ba22dcbf | 1141 | } |
1da177e4 LT |
1142 | } |
1143 | rdev_dec_pending(conf->disks[i].rdev, conf->mddev); | |
1da177e4 LT |
1144 | clear_bit(R5_LOCKED, &sh->dev[i].flags); |
1145 | set_bit(STRIPE_HANDLE, &sh->state); | |
1146 | release_stripe(sh); | |
1da177e4 LT |
1147 | } |
1148 | ||
d710e138 | 1149 | static void raid5_end_write_request(struct bio *bi, int error) |
1da177e4 LT |
1150 | { |
1151 | struct stripe_head *sh = bi->bi_private; | |
1152 | raid5_conf_t *conf = sh->raid_conf; | |
7ecaa1e6 | 1153 | int disks = sh->disks, i; |
1da177e4 LT |
1154 | int uptodate = test_bit(BIO_UPTODATE, &bi->bi_flags); |
1155 | ||
1da177e4 LT |
1156 | for (i=0 ; i<disks; i++) |
1157 | if (bi == &sh->dev[i].req) | |
1158 | break; | |
1159 | ||
45b4233c | 1160 | pr_debug("end_write_request %llu/%d, count %d, uptodate: %d.\n", |
1da177e4 LT |
1161 | (unsigned long long)sh->sector, i, atomic_read(&sh->count), |
1162 | uptodate); | |
1163 | if (i == disks) { | |
1164 | BUG(); | |
6712ecf8 | 1165 | return; |
1da177e4 LT |
1166 | } |
1167 | ||
1da177e4 LT |
1168 | if (!uptodate) |
1169 | md_error(conf->mddev, conf->disks[i].rdev); | |
1170 | ||
1171 | rdev_dec_pending(conf->disks[i].rdev, conf->mddev); | |
1172 | ||
1173 | clear_bit(R5_LOCKED, &sh->dev[i].flags); | |
1174 | set_bit(STRIPE_HANDLE, &sh->state); | |
c04be0aa | 1175 | release_stripe(sh); |
1da177e4 LT |
1176 | } |
1177 | ||
1178 | ||
1179 | static sector_t compute_blocknr(struct stripe_head *sh, int i); | |
1180 | ||
d710e138 | 1181 | static void raid5_build_block(struct stripe_head *sh, int i) |
1da177e4 LT |
1182 | { |
1183 | struct r5dev *dev = &sh->dev[i]; | |
1184 | ||
1185 | bio_init(&dev->req); | |
1186 | dev->req.bi_io_vec = &dev->vec; | |
1187 | dev->req.bi_vcnt++; | |
1188 | dev->req.bi_max_vecs++; | |
1189 | dev->vec.bv_page = dev->page; | |
1190 | dev->vec.bv_len = STRIPE_SIZE; | |
1191 | dev->vec.bv_offset = 0; | |
1192 | ||
1193 | dev->req.bi_sector = sh->sector; | |
1194 | dev->req.bi_private = sh; | |
1195 | ||
1196 | dev->flags = 0; | |
16a53ecc | 1197 | dev->sector = compute_blocknr(sh, i); |
1da177e4 LT |
1198 | } |
1199 | ||
1200 | static void error(mddev_t *mddev, mdk_rdev_t *rdev) | |
1201 | { | |
1202 | char b[BDEVNAME_SIZE]; | |
1203 | raid5_conf_t *conf = (raid5_conf_t *) mddev->private; | |
45b4233c | 1204 | pr_debug("raid5: error called\n"); |
1da177e4 | 1205 | |
b2d444d7 | 1206 | if (!test_bit(Faulty, &rdev->flags)) { |
850b2b42 | 1207 | set_bit(MD_CHANGE_DEVS, &mddev->flags); |
c04be0aa N |
1208 | if (test_and_clear_bit(In_sync, &rdev->flags)) { |
1209 | unsigned long flags; | |
1210 | spin_lock_irqsave(&conf->device_lock, flags); | |
1da177e4 | 1211 | mddev->degraded++; |
c04be0aa | 1212 | spin_unlock_irqrestore(&conf->device_lock, flags); |
1da177e4 LT |
1213 | /* |
1214 | * if recovery was running, make sure it aborts. | |
1215 | */ | |
dfc70645 | 1216 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); |
1da177e4 | 1217 | } |
b2d444d7 | 1218 | set_bit(Faulty, &rdev->flags); |
d710e138 N |
1219 | printk(KERN_ALERT |
1220 | "raid5: Disk failure on %s, disabling device.\n" | |
1221 | "raid5: Operation continuing on %d devices.\n", | |
1222 | bdevname(rdev->bdev,b), conf->raid_disks - mddev->degraded); | |
1da177e4 | 1223 | } |
16a53ecc | 1224 | } |
1da177e4 LT |
1225 | |
1226 | /* | |
1227 | * Input: a 'big' sector number, | |
1228 | * Output: index of the data and parity disk, and the sector # in them. | |
1229 | */ | |
1230 | static sector_t raid5_compute_sector(sector_t r_sector, unsigned int raid_disks, | |
1231 | unsigned int data_disks, unsigned int * dd_idx, | |
1232 | unsigned int * pd_idx, raid5_conf_t *conf) | |
1233 | { | |
1234 | long stripe; | |
1235 | unsigned long chunk_number; | |
1236 | unsigned int chunk_offset; | |
1237 | sector_t new_sector; | |
1238 | int sectors_per_chunk = conf->chunk_size >> 9; | |
1239 | ||
1240 | /* First compute the information on this sector */ | |
1241 | ||
1242 | /* | |
1243 | * Compute the chunk number and the sector offset inside the chunk | |
1244 | */ | |
1245 | chunk_offset = sector_div(r_sector, sectors_per_chunk); | |
1246 | chunk_number = r_sector; | |
1247 | BUG_ON(r_sector != chunk_number); | |
1248 | ||
1249 | /* | |
1250 | * Compute the stripe number | |
1251 | */ | |
1252 | stripe = chunk_number / data_disks; | |
1253 | ||
1254 | /* | |
1255 | * Compute the data disk and parity disk indexes inside the stripe | |
1256 | */ | |
1257 | *dd_idx = chunk_number % data_disks; | |
1258 | ||
1259 | /* | |
1260 | * Select the parity disk based on the user selected algorithm. | |
1261 | */ | |
16a53ecc N |
1262 | switch(conf->level) { |
1263 | case 4: | |
1da177e4 | 1264 | *pd_idx = data_disks; |
16a53ecc N |
1265 | break; |
1266 | case 5: | |
1267 | switch (conf->algorithm) { | |
1da177e4 LT |
1268 | case ALGORITHM_LEFT_ASYMMETRIC: |
1269 | *pd_idx = data_disks - stripe % raid_disks; | |
1270 | if (*dd_idx >= *pd_idx) | |
1271 | (*dd_idx)++; | |
1272 | break; | |
1273 | case ALGORITHM_RIGHT_ASYMMETRIC: | |
1274 | *pd_idx = stripe % raid_disks; | |
1275 | if (*dd_idx >= *pd_idx) | |
1276 | (*dd_idx)++; | |
1277 | break; | |
1278 | case ALGORITHM_LEFT_SYMMETRIC: | |
1279 | *pd_idx = data_disks - stripe % raid_disks; | |
1280 | *dd_idx = (*pd_idx + 1 + *dd_idx) % raid_disks; | |
1281 | break; | |
1282 | case ALGORITHM_RIGHT_SYMMETRIC: | |
1283 | *pd_idx = stripe % raid_disks; | |
1284 | *dd_idx = (*pd_idx + 1 + *dd_idx) % raid_disks; | |
1285 | break; | |
1286 | default: | |
14f8d26b | 1287 | printk(KERN_ERR "raid5: unsupported algorithm %d\n", |
1da177e4 | 1288 | conf->algorithm); |
16a53ecc N |
1289 | } |
1290 | break; | |
1291 | case 6: | |
1292 | ||
1293 | /**** FIX THIS ****/ | |
1294 | switch (conf->algorithm) { | |
1295 | case ALGORITHM_LEFT_ASYMMETRIC: | |
1296 | *pd_idx = raid_disks - 1 - (stripe % raid_disks); | |
1297 | if (*pd_idx == raid_disks-1) | |
1298 | (*dd_idx)++; /* Q D D D P */ | |
1299 | else if (*dd_idx >= *pd_idx) | |
1300 | (*dd_idx) += 2; /* D D P Q D */ | |
1301 | break; | |
1302 | case ALGORITHM_RIGHT_ASYMMETRIC: | |
1303 | *pd_idx = stripe % raid_disks; | |
1304 | if (*pd_idx == raid_disks-1) | |
1305 | (*dd_idx)++; /* Q D D D P */ | |
1306 | else if (*dd_idx >= *pd_idx) | |
1307 | (*dd_idx) += 2; /* D D P Q D */ | |
1308 | break; | |
1309 | case ALGORITHM_LEFT_SYMMETRIC: | |
1310 | *pd_idx = raid_disks - 1 - (stripe % raid_disks); | |
1311 | *dd_idx = (*pd_idx + 2 + *dd_idx) % raid_disks; | |
1312 | break; | |
1313 | case ALGORITHM_RIGHT_SYMMETRIC: | |
1314 | *pd_idx = stripe % raid_disks; | |
1315 | *dd_idx = (*pd_idx + 2 + *dd_idx) % raid_disks; | |
1316 | break; | |
1317 | default: | |
d710e138 N |
1318 | printk(KERN_CRIT "raid6: unsupported algorithm %d\n", |
1319 | conf->algorithm); | |
16a53ecc N |
1320 | } |
1321 | break; | |
1da177e4 LT |
1322 | } |
1323 | ||
1324 | /* | |
1325 | * Finally, compute the new sector number | |
1326 | */ | |
1327 | new_sector = (sector_t)stripe * sectors_per_chunk + chunk_offset; | |
1328 | return new_sector; | |
1329 | } | |
1330 | ||
1331 | ||
1332 | static sector_t compute_blocknr(struct stripe_head *sh, int i) | |
1333 | { | |
1334 | raid5_conf_t *conf = sh->raid_conf; | |
b875e531 N |
1335 | int raid_disks = sh->disks; |
1336 | int data_disks = raid_disks - conf->max_degraded; | |
1da177e4 LT |
1337 | sector_t new_sector = sh->sector, check; |
1338 | int sectors_per_chunk = conf->chunk_size >> 9; | |
1339 | sector_t stripe; | |
1340 | int chunk_offset; | |
1341 | int chunk_number, dummy1, dummy2, dd_idx = i; | |
1342 | sector_t r_sector; | |
1343 | ||
16a53ecc | 1344 | |
1da177e4 LT |
1345 | chunk_offset = sector_div(new_sector, sectors_per_chunk); |
1346 | stripe = new_sector; | |
1347 | BUG_ON(new_sector != stripe); | |
1348 | ||
16a53ecc N |
1349 | if (i == sh->pd_idx) |
1350 | return 0; | |
1351 | switch(conf->level) { | |
1352 | case 4: break; | |
1353 | case 5: | |
1354 | switch (conf->algorithm) { | |
1da177e4 LT |
1355 | case ALGORITHM_LEFT_ASYMMETRIC: |
1356 | case ALGORITHM_RIGHT_ASYMMETRIC: | |
1357 | if (i > sh->pd_idx) | |
1358 | i--; | |
1359 | break; | |
1360 | case ALGORITHM_LEFT_SYMMETRIC: | |
1361 | case ALGORITHM_RIGHT_SYMMETRIC: | |
1362 | if (i < sh->pd_idx) | |
1363 | i += raid_disks; | |
1364 | i -= (sh->pd_idx + 1); | |
1365 | break; | |
1366 | default: | |
14f8d26b | 1367 | printk(KERN_ERR "raid5: unsupported algorithm %d\n", |
16a53ecc N |
1368 | conf->algorithm); |
1369 | } | |
1370 | break; | |
1371 | case 6: | |
16a53ecc N |
1372 | if (i == raid6_next_disk(sh->pd_idx, raid_disks)) |
1373 | return 0; /* It is the Q disk */ | |
1374 | switch (conf->algorithm) { | |
1375 | case ALGORITHM_LEFT_ASYMMETRIC: | |
1376 | case ALGORITHM_RIGHT_ASYMMETRIC: | |
1377 | if (sh->pd_idx == raid_disks-1) | |
1378 | i--; /* Q D D D P */ | |
1379 | else if (i > sh->pd_idx) | |
1380 | i -= 2; /* D D P Q D */ | |
1381 | break; | |
1382 | case ALGORITHM_LEFT_SYMMETRIC: | |
1383 | case ALGORITHM_RIGHT_SYMMETRIC: | |
1384 | if (sh->pd_idx == raid_disks-1) | |
1385 | i--; /* Q D D D P */ | |
1386 | else { | |
1387 | /* D D P Q D */ | |
1388 | if (i < sh->pd_idx) | |
1389 | i += raid_disks; | |
1390 | i -= (sh->pd_idx + 2); | |
1391 | } | |
1392 | break; | |
1393 | default: | |
d710e138 N |
1394 | printk(KERN_CRIT "raid6: unsupported algorithm %d\n", |
1395 | conf->algorithm); | |
16a53ecc N |
1396 | } |
1397 | break; | |
1da177e4 LT |
1398 | } |
1399 | ||
1400 | chunk_number = stripe * data_disks + i; | |
1401 | r_sector = (sector_t)chunk_number * sectors_per_chunk + chunk_offset; | |
1402 | ||
d710e138 | 1403 | check = raid5_compute_sector(r_sector, raid_disks, data_disks, &dummy1, &dummy2, conf); |
1da177e4 | 1404 | if (check != sh->sector || dummy1 != dd_idx || dummy2 != sh->pd_idx) { |
14f8d26b | 1405 | printk(KERN_ERR "compute_blocknr: map not correct\n"); |
1da177e4 LT |
1406 | return 0; |
1407 | } | |
1408 | return r_sector; | |
1409 | } | |
1410 | ||
1411 | ||
1412 | ||
1413 | /* | |
16a53ecc N |
1414 | * Copy data between a page in the stripe cache, and one or more bion |
1415 | * The page could align with the middle of the bio, or there could be | |
1416 | * several bion, each with several bio_vecs, which cover part of the page | |
1417 | * Multiple bion are linked together on bi_next. There may be extras | |
1418 | * at the end of this list. We ignore them. | |
1da177e4 LT |
1419 | */ |
1420 | static void copy_data(int frombio, struct bio *bio, | |
1421 | struct page *page, | |
1422 | sector_t sector) | |
1423 | { | |
1424 | char *pa = page_address(page); | |
1425 | struct bio_vec *bvl; | |
1426 | int i; | |
1427 | int page_offset; | |
1428 | ||
1429 | if (bio->bi_sector >= sector) | |
1430 | page_offset = (signed)(bio->bi_sector - sector) * 512; | |
1431 | else | |
1432 | page_offset = (signed)(sector - bio->bi_sector) * -512; | |
1433 | bio_for_each_segment(bvl, bio, i) { | |
1434 | int len = bio_iovec_idx(bio,i)->bv_len; | |
1435 | int clen; | |
1436 | int b_offset = 0; | |
1437 | ||
1438 | if (page_offset < 0) { | |
1439 | b_offset = -page_offset; | |
1440 | page_offset += b_offset; | |
1441 | len -= b_offset; | |
1442 | } | |
1443 | ||
1444 | if (len > 0 && page_offset + len > STRIPE_SIZE) | |
1445 | clen = STRIPE_SIZE - page_offset; | |
1446 | else clen = len; | |
16a53ecc | 1447 | |
1da177e4 LT |
1448 | if (clen > 0) { |
1449 | char *ba = __bio_kmap_atomic(bio, i, KM_USER0); | |
1450 | if (frombio) | |
1451 | memcpy(pa+page_offset, ba+b_offset, clen); | |
1452 | else | |
1453 | memcpy(ba+b_offset, pa+page_offset, clen); | |
1454 | __bio_kunmap_atomic(ba, KM_USER0); | |
1455 | } | |
1456 | if (clen < len) /* hit end of page */ | |
1457 | break; | |
1458 | page_offset += len; | |
1459 | } | |
1460 | } | |
1461 | ||
9bc89cd8 DW |
1462 | #define check_xor() do { \ |
1463 | if (count == MAX_XOR_BLOCKS) { \ | |
1464 | xor_blocks(count, STRIPE_SIZE, dest, ptr);\ | |
1465 | count = 0; \ | |
1466 | } \ | |
1da177e4 LT |
1467 | } while(0) |
1468 | ||
16a53ecc N |
1469 | static void compute_parity6(struct stripe_head *sh, int method) |
1470 | { | |
1471 | raid6_conf_t *conf = sh->raid_conf; | |
f416885e | 1472 | int i, pd_idx = sh->pd_idx, qd_idx, d0_idx, disks = sh->disks, count; |
16a53ecc N |
1473 | struct bio *chosen; |
1474 | /**** FIX THIS: This could be very bad if disks is close to 256 ****/ | |
1475 | void *ptrs[disks]; | |
1476 | ||
1477 | qd_idx = raid6_next_disk(pd_idx, disks); | |
1478 | d0_idx = raid6_next_disk(qd_idx, disks); | |
1479 | ||
45b4233c | 1480 | pr_debug("compute_parity, stripe %llu, method %d\n", |
16a53ecc N |
1481 | (unsigned long long)sh->sector, method); |
1482 | ||
1483 | switch(method) { | |
1484 | case READ_MODIFY_WRITE: | |
1485 | BUG(); /* READ_MODIFY_WRITE N/A for RAID-6 */ | |
1486 | case RECONSTRUCT_WRITE: | |
1487 | for (i= disks; i-- ;) | |
1488 | if ( i != pd_idx && i != qd_idx && sh->dev[i].towrite ) { | |
1489 | chosen = sh->dev[i].towrite; | |
1490 | sh->dev[i].towrite = NULL; | |
1491 | ||
1492 | if (test_and_clear_bit(R5_Overlap, &sh->dev[i].flags)) | |
1493 | wake_up(&conf->wait_for_overlap); | |
1494 | ||
52e5f9d1 | 1495 | BUG_ON(sh->dev[i].written); |
16a53ecc N |
1496 | sh->dev[i].written = chosen; |
1497 | } | |
1498 | break; | |
1499 | case CHECK_PARITY: | |
1500 | BUG(); /* Not implemented yet */ | |
1501 | } | |
1502 | ||
1503 | for (i = disks; i--;) | |
1504 | if (sh->dev[i].written) { | |
1505 | sector_t sector = sh->dev[i].sector; | |
1506 | struct bio *wbi = sh->dev[i].written; | |
1507 | while (wbi && wbi->bi_sector < sector + STRIPE_SECTORS) { | |
1508 | copy_data(1, wbi, sh->dev[i].page, sector); | |
1509 | wbi = r5_next_bio(wbi, sector); | |
1510 | } | |
1511 | ||
1512 | set_bit(R5_LOCKED, &sh->dev[i].flags); | |
1513 | set_bit(R5_UPTODATE, &sh->dev[i].flags); | |
1514 | } | |
1515 | ||
1516 | // switch(method) { | |
1517 | // case RECONSTRUCT_WRITE: | |
1518 | // case CHECK_PARITY: | |
1519 | // case UPDATE_PARITY: | |
1520 | /* Note that unlike RAID-5, the ordering of the disks matters greatly. */ | |
1521 | /* FIX: Is this ordering of drives even remotely optimal? */ | |
1522 | count = 0; | |
1523 | i = d0_idx; | |
1524 | do { | |
1525 | ptrs[count++] = page_address(sh->dev[i].page); | |
1526 | if (count <= disks-2 && !test_bit(R5_UPTODATE, &sh->dev[i].flags)) | |
1527 | printk("block %d/%d not uptodate on parity calc\n", i,count); | |
1528 | i = raid6_next_disk(i, disks); | |
1529 | } while ( i != d0_idx ); | |
1530 | // break; | |
1531 | // } | |
1532 | ||
1533 | raid6_call.gen_syndrome(disks, STRIPE_SIZE, ptrs); | |
1534 | ||
1535 | switch(method) { | |
1536 | case RECONSTRUCT_WRITE: | |
1537 | set_bit(R5_UPTODATE, &sh->dev[pd_idx].flags); | |
1538 | set_bit(R5_UPTODATE, &sh->dev[qd_idx].flags); | |
1539 | set_bit(R5_LOCKED, &sh->dev[pd_idx].flags); | |
1540 | set_bit(R5_LOCKED, &sh->dev[qd_idx].flags); | |
1541 | break; | |
1542 | case UPDATE_PARITY: | |
1543 | set_bit(R5_UPTODATE, &sh->dev[pd_idx].flags); | |
1544 | set_bit(R5_UPTODATE, &sh->dev[qd_idx].flags); | |
1545 | break; | |
1546 | } | |
1547 | } | |
1548 | ||
1549 | ||
1550 | /* Compute one missing block */ | |
1551 | static void compute_block_1(struct stripe_head *sh, int dd_idx, int nozero) | |
1552 | { | |
f416885e | 1553 | int i, count, disks = sh->disks; |
9bc89cd8 | 1554 | void *ptr[MAX_XOR_BLOCKS], *dest, *p; |
16a53ecc N |
1555 | int pd_idx = sh->pd_idx; |
1556 | int qd_idx = raid6_next_disk(pd_idx, disks); | |
1557 | ||
45b4233c | 1558 | pr_debug("compute_block_1, stripe %llu, idx %d\n", |
16a53ecc N |
1559 | (unsigned long long)sh->sector, dd_idx); |
1560 | ||
1561 | if ( dd_idx == qd_idx ) { | |
1562 | /* We're actually computing the Q drive */ | |
1563 | compute_parity6(sh, UPDATE_PARITY); | |
1564 | } else { | |
9bc89cd8 DW |
1565 | dest = page_address(sh->dev[dd_idx].page); |
1566 | if (!nozero) memset(dest, 0, STRIPE_SIZE); | |
1567 | count = 0; | |
16a53ecc N |
1568 | for (i = disks ; i--; ) { |
1569 | if (i == dd_idx || i == qd_idx) | |
1570 | continue; | |
1571 | p = page_address(sh->dev[i].page); | |
1572 | if (test_bit(R5_UPTODATE, &sh->dev[i].flags)) | |
1573 | ptr[count++] = p; | |
1574 | else | |
1575 | printk("compute_block() %d, stripe %llu, %d" | |
1576 | " not present\n", dd_idx, | |
1577 | (unsigned long long)sh->sector, i); | |
1578 | ||
1579 | check_xor(); | |
1580 | } | |
9bc89cd8 DW |
1581 | if (count) |
1582 | xor_blocks(count, STRIPE_SIZE, dest, ptr); | |
16a53ecc N |
1583 | if (!nozero) set_bit(R5_UPTODATE, &sh->dev[dd_idx].flags); |
1584 | else clear_bit(R5_UPTODATE, &sh->dev[dd_idx].flags); | |
1585 | } | |
1586 | } | |
1587 | ||
1588 | /* Compute two missing blocks */ | |
1589 | static void compute_block_2(struct stripe_head *sh, int dd_idx1, int dd_idx2) | |
1590 | { | |
f416885e | 1591 | int i, count, disks = sh->disks; |
16a53ecc N |
1592 | int pd_idx = sh->pd_idx; |
1593 | int qd_idx = raid6_next_disk(pd_idx, disks); | |
1594 | int d0_idx = raid6_next_disk(qd_idx, disks); | |
1595 | int faila, failb; | |
1596 | ||
1597 | /* faila and failb are disk numbers relative to d0_idx */ | |
1598 | /* pd_idx become disks-2 and qd_idx become disks-1 */ | |
1599 | faila = (dd_idx1 < d0_idx) ? dd_idx1+(disks-d0_idx) : dd_idx1-d0_idx; | |
1600 | failb = (dd_idx2 < d0_idx) ? dd_idx2+(disks-d0_idx) : dd_idx2-d0_idx; | |
1601 | ||
1602 | BUG_ON(faila == failb); | |
1603 | if ( failb < faila ) { int tmp = faila; faila = failb; failb = tmp; } | |
1604 | ||
45b4233c | 1605 | pr_debug("compute_block_2, stripe %llu, idx %d,%d (%d,%d)\n", |
16a53ecc N |
1606 | (unsigned long long)sh->sector, dd_idx1, dd_idx2, faila, failb); |
1607 | ||
1608 | if ( failb == disks-1 ) { | |
1609 | /* Q disk is one of the missing disks */ | |
1610 | if ( faila == disks-2 ) { | |
1611 | /* Missing P+Q, just recompute */ | |
1612 | compute_parity6(sh, UPDATE_PARITY); | |
1613 | return; | |
1614 | } else { | |
1615 | /* We're missing D+Q; recompute D from P */ | |
1616 | compute_block_1(sh, (dd_idx1 == qd_idx) ? dd_idx2 : dd_idx1, 0); | |
1617 | compute_parity6(sh, UPDATE_PARITY); /* Is this necessary? */ | |
1618 | return; | |
1619 | } | |
1620 | } | |
1621 | ||
1622 | /* We're missing D+P or D+D; build pointer table */ | |
1623 | { | |
1624 | /**** FIX THIS: This could be very bad if disks is close to 256 ****/ | |
1625 | void *ptrs[disks]; | |
1626 | ||
1627 | count = 0; | |
1628 | i = d0_idx; | |
1629 | do { | |
1630 | ptrs[count++] = page_address(sh->dev[i].page); | |
1631 | i = raid6_next_disk(i, disks); | |
1632 | if (i != dd_idx1 && i != dd_idx2 && | |
1633 | !test_bit(R5_UPTODATE, &sh->dev[i].flags)) | |
1634 | printk("compute_2 with missing block %d/%d\n", count, i); | |
1635 | } while ( i != d0_idx ); | |
1636 | ||
1637 | if ( failb == disks-2 ) { | |
1638 | /* We're missing D+P. */ | |
1639 | raid6_datap_recov(disks, STRIPE_SIZE, faila, ptrs); | |
1640 | } else { | |
1641 | /* We're missing D+D. */ | |
1642 | raid6_2data_recov(disks, STRIPE_SIZE, faila, failb, ptrs); | |
1643 | } | |
1644 | ||
1645 | /* Both the above update both missing blocks */ | |
1646 | set_bit(R5_UPTODATE, &sh->dev[dd_idx1].flags); | |
1647 | set_bit(R5_UPTODATE, &sh->dev[dd_idx2].flags); | |
1648 | } | |
1649 | } | |
1650 | ||
600aa109 | 1651 | static void |
1fe797e6 | 1652 | schedule_reconstruction5(struct stripe_head *sh, struct stripe_head_state *s, |
600aa109 | 1653 | int rcw, int expand) |
e33129d8 DW |
1654 | { |
1655 | int i, pd_idx = sh->pd_idx, disks = sh->disks; | |
e33129d8 DW |
1656 | |
1657 | if (rcw) { | |
1658 | /* if we are not expanding this is a proper write request, and | |
1659 | * there will be bios with new data to be drained into the | |
1660 | * stripe cache | |
1661 | */ | |
1662 | if (!expand) { | |
600aa109 DW |
1663 | sh->reconstruct_state = reconstruct_state_drain_run; |
1664 | set_bit(STRIPE_OP_BIODRAIN, &s->ops_request); | |
1665 | } else | |
1666 | sh->reconstruct_state = reconstruct_state_run; | |
16a53ecc | 1667 | |
600aa109 | 1668 | set_bit(STRIPE_OP_POSTXOR, &s->ops_request); |
e33129d8 DW |
1669 | |
1670 | for (i = disks; i--; ) { | |
1671 | struct r5dev *dev = &sh->dev[i]; | |
1672 | ||
1673 | if (dev->towrite) { | |
1674 | set_bit(R5_LOCKED, &dev->flags); | |
d8ee0728 | 1675 | set_bit(R5_Wantdrain, &dev->flags); |
e33129d8 DW |
1676 | if (!expand) |
1677 | clear_bit(R5_UPTODATE, &dev->flags); | |
600aa109 | 1678 | s->locked++; |
e33129d8 DW |
1679 | } |
1680 | } | |
600aa109 | 1681 | if (s->locked + 1 == disks) |
8b3e6cdc DW |
1682 | if (!test_and_set_bit(STRIPE_FULL_WRITE, &sh->state)) |
1683 | atomic_inc(&sh->raid_conf->pending_full_writes); | |
e33129d8 DW |
1684 | } else { |
1685 | BUG_ON(!(test_bit(R5_UPTODATE, &sh->dev[pd_idx].flags) || | |
1686 | test_bit(R5_Wantcompute, &sh->dev[pd_idx].flags))); | |
1687 | ||
d8ee0728 | 1688 | sh->reconstruct_state = reconstruct_state_prexor_drain_run; |
600aa109 DW |
1689 | set_bit(STRIPE_OP_PREXOR, &s->ops_request); |
1690 | set_bit(STRIPE_OP_BIODRAIN, &s->ops_request); | |
1691 | set_bit(STRIPE_OP_POSTXOR, &s->ops_request); | |
e33129d8 DW |
1692 | |
1693 | for (i = disks; i--; ) { | |
1694 | struct r5dev *dev = &sh->dev[i]; | |
1695 | if (i == pd_idx) | |
1696 | continue; | |
1697 | ||
e33129d8 DW |
1698 | if (dev->towrite && |
1699 | (test_bit(R5_UPTODATE, &dev->flags) || | |
d8ee0728 DW |
1700 | test_bit(R5_Wantcompute, &dev->flags))) { |
1701 | set_bit(R5_Wantdrain, &dev->flags); | |
e33129d8 DW |
1702 | set_bit(R5_LOCKED, &dev->flags); |
1703 | clear_bit(R5_UPTODATE, &dev->flags); | |
600aa109 | 1704 | s->locked++; |
e33129d8 DW |
1705 | } |
1706 | } | |
1707 | } | |
1708 | ||
1709 | /* keep the parity disk locked while asynchronous operations | |
1710 | * are in flight | |
1711 | */ | |
1712 | set_bit(R5_LOCKED, &sh->dev[pd_idx].flags); | |
1713 | clear_bit(R5_UPTODATE, &sh->dev[pd_idx].flags); | |
600aa109 | 1714 | s->locked++; |
e33129d8 | 1715 | |
600aa109 | 1716 | pr_debug("%s: stripe %llu locked: %d ops_request: %lx\n", |
e46b272b | 1717 | __func__, (unsigned long long)sh->sector, |
600aa109 | 1718 | s->locked, s->ops_request); |
e33129d8 | 1719 | } |
16a53ecc | 1720 | |
1da177e4 LT |
1721 | /* |
1722 | * Each stripe/dev can have one or more bion attached. | |
16a53ecc | 1723 | * toread/towrite point to the first in a chain. |
1da177e4 LT |
1724 | * The bi_next chain must be in order. |
1725 | */ | |
1726 | static int add_stripe_bio(struct stripe_head *sh, struct bio *bi, int dd_idx, int forwrite) | |
1727 | { | |
1728 | struct bio **bip; | |
1729 | raid5_conf_t *conf = sh->raid_conf; | |
72626685 | 1730 | int firstwrite=0; |
1da177e4 | 1731 | |
45b4233c | 1732 | pr_debug("adding bh b#%llu to stripe s#%llu\n", |
1da177e4 LT |
1733 | (unsigned long long)bi->bi_sector, |
1734 | (unsigned long long)sh->sector); | |
1735 | ||
1736 | ||
1737 | spin_lock(&sh->lock); | |
1738 | spin_lock_irq(&conf->device_lock); | |
72626685 | 1739 | if (forwrite) { |
1da177e4 | 1740 | bip = &sh->dev[dd_idx].towrite; |
72626685 N |
1741 | if (*bip == NULL && sh->dev[dd_idx].written == NULL) |
1742 | firstwrite = 1; | |
1743 | } else | |
1da177e4 LT |
1744 | bip = &sh->dev[dd_idx].toread; |
1745 | while (*bip && (*bip)->bi_sector < bi->bi_sector) { | |
1746 | if ((*bip)->bi_sector + ((*bip)->bi_size >> 9) > bi->bi_sector) | |
1747 | goto overlap; | |
1748 | bip = & (*bip)->bi_next; | |
1749 | } | |
1750 | if (*bip && (*bip)->bi_sector < bi->bi_sector + ((bi->bi_size)>>9)) | |
1751 | goto overlap; | |
1752 | ||
78bafebd | 1753 | BUG_ON(*bip && bi->bi_next && (*bip) != bi->bi_next); |
1da177e4 LT |
1754 | if (*bip) |
1755 | bi->bi_next = *bip; | |
1756 | *bip = bi; | |
960e739d | 1757 | bi->bi_phys_segments++; |
1da177e4 LT |
1758 | spin_unlock_irq(&conf->device_lock); |
1759 | spin_unlock(&sh->lock); | |
1760 | ||
45b4233c | 1761 | pr_debug("added bi b#%llu to stripe s#%llu, disk %d.\n", |
1da177e4 LT |
1762 | (unsigned long long)bi->bi_sector, |
1763 | (unsigned long long)sh->sector, dd_idx); | |
1764 | ||
72626685 | 1765 | if (conf->mddev->bitmap && firstwrite) { |
72626685 N |
1766 | bitmap_startwrite(conf->mddev->bitmap, sh->sector, |
1767 | STRIPE_SECTORS, 0); | |
ae3c20cc | 1768 | sh->bm_seq = conf->seq_flush+1; |
72626685 N |
1769 | set_bit(STRIPE_BIT_DELAY, &sh->state); |
1770 | } | |
1771 | ||
1da177e4 LT |
1772 | if (forwrite) { |
1773 | /* check if page is covered */ | |
1774 | sector_t sector = sh->dev[dd_idx].sector; | |
1775 | for (bi=sh->dev[dd_idx].towrite; | |
1776 | sector < sh->dev[dd_idx].sector + STRIPE_SECTORS && | |
1777 | bi && bi->bi_sector <= sector; | |
1778 | bi = r5_next_bio(bi, sh->dev[dd_idx].sector)) { | |
1779 | if (bi->bi_sector + (bi->bi_size>>9) >= sector) | |
1780 | sector = bi->bi_sector + (bi->bi_size>>9); | |
1781 | } | |
1782 | if (sector >= sh->dev[dd_idx].sector + STRIPE_SECTORS) | |
1783 | set_bit(R5_OVERWRITE, &sh->dev[dd_idx].flags); | |
1784 | } | |
1785 | return 1; | |
1786 | ||
1787 | overlap: | |
1788 | set_bit(R5_Overlap, &sh->dev[dd_idx].flags); | |
1789 | spin_unlock_irq(&conf->device_lock); | |
1790 | spin_unlock(&sh->lock); | |
1791 | return 0; | |
1792 | } | |
1793 | ||
29269553 N |
1794 | static void end_reshape(raid5_conf_t *conf); |
1795 | ||
16a53ecc N |
1796 | static int page_is_zero(struct page *p) |
1797 | { | |
1798 | char *a = page_address(p); | |
1799 | return ((*(u32*)a) == 0 && | |
1800 | memcmp(a, a+4, STRIPE_SIZE-4)==0); | |
1801 | } | |
1802 | ||
ccfcc3c1 N |
1803 | static int stripe_to_pdidx(sector_t stripe, raid5_conf_t *conf, int disks) |
1804 | { | |
1805 | int sectors_per_chunk = conf->chunk_size >> 9; | |
ccfcc3c1 | 1806 | int pd_idx, dd_idx; |
2d2063ce CQH |
1807 | int chunk_offset = sector_div(stripe, sectors_per_chunk); |
1808 | ||
b875e531 N |
1809 | raid5_compute_sector(stripe * (disks - conf->max_degraded) |
1810 | *sectors_per_chunk + chunk_offset, | |
1811 | disks, disks - conf->max_degraded, | |
1812 | &dd_idx, &pd_idx, conf); | |
ccfcc3c1 N |
1813 | return pd_idx; |
1814 | } | |
1815 | ||
a4456856 | 1816 | static void |
1fe797e6 | 1817 | handle_failed_stripe(raid5_conf_t *conf, struct stripe_head *sh, |
a4456856 DW |
1818 | struct stripe_head_state *s, int disks, |
1819 | struct bio **return_bi) | |
1820 | { | |
1821 | int i; | |
1822 | for (i = disks; i--; ) { | |
1823 | struct bio *bi; | |
1824 | int bitmap_end = 0; | |
1825 | ||
1826 | if (test_bit(R5_ReadError, &sh->dev[i].flags)) { | |
1827 | mdk_rdev_t *rdev; | |
1828 | rcu_read_lock(); | |
1829 | rdev = rcu_dereference(conf->disks[i].rdev); | |
1830 | if (rdev && test_bit(In_sync, &rdev->flags)) | |
1831 | /* multiple read failures in one stripe */ | |
1832 | md_error(conf->mddev, rdev); | |
1833 | rcu_read_unlock(); | |
1834 | } | |
1835 | spin_lock_irq(&conf->device_lock); | |
1836 | /* fail all writes first */ | |
1837 | bi = sh->dev[i].towrite; | |
1838 | sh->dev[i].towrite = NULL; | |
1839 | if (bi) { | |
1840 | s->to_write--; | |
1841 | bitmap_end = 1; | |
1842 | } | |
1843 | ||
1844 | if (test_and_clear_bit(R5_Overlap, &sh->dev[i].flags)) | |
1845 | wake_up(&conf->wait_for_overlap); | |
1846 | ||
1847 | while (bi && bi->bi_sector < | |
1848 | sh->dev[i].sector + STRIPE_SECTORS) { | |
1849 | struct bio *nextbi = r5_next_bio(bi, sh->dev[i].sector); | |
1850 | clear_bit(BIO_UPTODATE, &bi->bi_flags); | |
960e739d | 1851 | if (!raid5_dec_bi_phys_segments(bi)) { |
a4456856 DW |
1852 | md_write_end(conf->mddev); |
1853 | bi->bi_next = *return_bi; | |
1854 | *return_bi = bi; | |
1855 | } | |
1856 | bi = nextbi; | |
1857 | } | |
1858 | /* and fail all 'written' */ | |
1859 | bi = sh->dev[i].written; | |
1860 | sh->dev[i].written = NULL; | |
1861 | if (bi) bitmap_end = 1; | |
1862 | while (bi && bi->bi_sector < | |
1863 | sh->dev[i].sector + STRIPE_SECTORS) { | |
1864 | struct bio *bi2 = r5_next_bio(bi, sh->dev[i].sector); | |
1865 | clear_bit(BIO_UPTODATE, &bi->bi_flags); | |
960e739d | 1866 | if (!raid5_dec_bi_phys_segments(bi)) { |
a4456856 DW |
1867 | md_write_end(conf->mddev); |
1868 | bi->bi_next = *return_bi; | |
1869 | *return_bi = bi; | |
1870 | } | |
1871 | bi = bi2; | |
1872 | } | |
1873 | ||
b5e98d65 DW |
1874 | /* fail any reads if this device is non-operational and |
1875 | * the data has not reached the cache yet. | |
1876 | */ | |
1877 | if (!test_bit(R5_Wantfill, &sh->dev[i].flags) && | |
1878 | (!test_bit(R5_Insync, &sh->dev[i].flags) || | |
1879 | test_bit(R5_ReadError, &sh->dev[i].flags))) { | |
a4456856 DW |
1880 | bi = sh->dev[i].toread; |
1881 | sh->dev[i].toread = NULL; | |
1882 | if (test_and_clear_bit(R5_Overlap, &sh->dev[i].flags)) | |
1883 | wake_up(&conf->wait_for_overlap); | |
1884 | if (bi) s->to_read--; | |
1885 | while (bi && bi->bi_sector < | |
1886 | sh->dev[i].sector + STRIPE_SECTORS) { | |
1887 | struct bio *nextbi = | |
1888 | r5_next_bio(bi, sh->dev[i].sector); | |
1889 | clear_bit(BIO_UPTODATE, &bi->bi_flags); | |
960e739d | 1890 | if (!raid5_dec_bi_phys_segments(bi)) { |
a4456856 DW |
1891 | bi->bi_next = *return_bi; |
1892 | *return_bi = bi; | |
1893 | } | |
1894 | bi = nextbi; | |
1895 | } | |
1896 | } | |
1897 | spin_unlock_irq(&conf->device_lock); | |
1898 | if (bitmap_end) | |
1899 | bitmap_endwrite(conf->mddev->bitmap, sh->sector, | |
1900 | STRIPE_SECTORS, 0, 0); | |
1901 | } | |
1902 | ||
8b3e6cdc DW |
1903 | if (test_and_clear_bit(STRIPE_FULL_WRITE, &sh->state)) |
1904 | if (atomic_dec_and_test(&conf->pending_full_writes)) | |
1905 | md_wakeup_thread(conf->mddev->thread); | |
a4456856 DW |
1906 | } |
1907 | ||
1fe797e6 DW |
1908 | /* fetch_block5 - checks the given member device to see if its data needs |
1909 | * to be read or computed to satisfy a request. | |
1910 | * | |
1911 | * Returns 1 when no more member devices need to be checked, otherwise returns | |
1912 | * 0 to tell the loop in handle_stripe_fill5 to continue | |
f38e1219 | 1913 | */ |
1fe797e6 DW |
1914 | static int fetch_block5(struct stripe_head *sh, struct stripe_head_state *s, |
1915 | int disk_idx, int disks) | |
f38e1219 DW |
1916 | { |
1917 | struct r5dev *dev = &sh->dev[disk_idx]; | |
1918 | struct r5dev *failed_dev = &sh->dev[s->failed_num]; | |
1919 | ||
f38e1219 DW |
1920 | /* is the data in this block needed, and can we get it? */ |
1921 | if (!test_bit(R5_LOCKED, &dev->flags) && | |
1fe797e6 DW |
1922 | !test_bit(R5_UPTODATE, &dev->flags) && |
1923 | (dev->toread || | |
1924 | (dev->towrite && !test_bit(R5_OVERWRITE, &dev->flags)) || | |
1925 | s->syncing || s->expanding || | |
1926 | (s->failed && | |
1927 | (failed_dev->toread || | |
1928 | (failed_dev->towrite && | |
1929 | !test_bit(R5_OVERWRITE, &failed_dev->flags)))))) { | |
976ea8d4 DW |
1930 | /* We would like to get this block, possibly by computing it, |
1931 | * otherwise read it if the backing disk is insync | |
f38e1219 DW |
1932 | */ |
1933 | if ((s->uptodate == disks - 1) && | |
ecc65c9b | 1934 | (s->failed && disk_idx == s->failed_num)) { |
976ea8d4 DW |
1935 | set_bit(STRIPE_COMPUTE_RUN, &sh->state); |
1936 | set_bit(STRIPE_OP_COMPUTE_BLK, &s->ops_request); | |
f38e1219 DW |
1937 | set_bit(R5_Wantcompute, &dev->flags); |
1938 | sh->ops.target = disk_idx; | |
1939 | s->req_compute = 1; | |
f38e1219 DW |
1940 | /* Careful: from this point on 'uptodate' is in the eye |
1941 | * of raid5_run_ops which services 'compute' operations | |
1942 | * before writes. R5_Wantcompute flags a block that will | |
1943 | * be R5_UPTODATE by the time it is needed for a | |
1944 | * subsequent operation. | |
1945 | */ | |
1946 | s->uptodate++; | |
1fe797e6 | 1947 | return 1; /* uptodate + compute == disks */ |
7a1fc53c | 1948 | } else if (test_bit(R5_Insync, &dev->flags)) { |
f38e1219 DW |
1949 | set_bit(R5_LOCKED, &dev->flags); |
1950 | set_bit(R5_Wantread, &dev->flags); | |
f38e1219 DW |
1951 | s->locked++; |
1952 | pr_debug("Reading block %d (sync=%d)\n", disk_idx, | |
1953 | s->syncing); | |
1954 | } | |
1955 | } | |
1956 | ||
1fe797e6 | 1957 | return 0; |
f38e1219 DW |
1958 | } |
1959 | ||
1fe797e6 DW |
1960 | /** |
1961 | * handle_stripe_fill5 - read or compute data to satisfy pending requests. | |
1962 | */ | |
1963 | static void handle_stripe_fill5(struct stripe_head *sh, | |
a4456856 DW |
1964 | struct stripe_head_state *s, int disks) |
1965 | { | |
1966 | int i; | |
f38e1219 | 1967 | |
f38e1219 DW |
1968 | /* look for blocks to read/compute, skip this if a compute |
1969 | * is already in flight, or if the stripe contents are in the | |
1970 | * midst of changing due to a write | |
1971 | */ | |
976ea8d4 | 1972 | if (!test_bit(STRIPE_COMPUTE_RUN, &sh->state) && !sh->check_state && |
1fe797e6 | 1973 | !sh->reconstruct_state) |
f38e1219 | 1974 | for (i = disks; i--; ) |
1fe797e6 | 1975 | if (fetch_block5(sh, s, i, disks)) |
f38e1219 | 1976 | break; |
a4456856 DW |
1977 | set_bit(STRIPE_HANDLE, &sh->state); |
1978 | } | |
1979 | ||
1fe797e6 | 1980 | static void handle_stripe_fill6(struct stripe_head *sh, |
a4456856 DW |
1981 | struct stripe_head_state *s, struct r6_state *r6s, |
1982 | int disks) | |
1983 | { | |
1984 | int i; | |
1985 | for (i = disks; i--; ) { | |
1986 | struct r5dev *dev = &sh->dev[i]; | |
1987 | if (!test_bit(R5_LOCKED, &dev->flags) && | |
1988 | !test_bit(R5_UPTODATE, &dev->flags) && | |
1989 | (dev->toread || (dev->towrite && | |
1990 | !test_bit(R5_OVERWRITE, &dev->flags)) || | |
1991 | s->syncing || s->expanding || | |
1992 | (s->failed >= 1 && | |
1993 | (sh->dev[r6s->failed_num[0]].toread || | |
1994 | s->to_write)) || | |
1995 | (s->failed >= 2 && | |
1996 | (sh->dev[r6s->failed_num[1]].toread || | |
1997 | s->to_write)))) { | |
1998 | /* we would like to get this block, possibly | |
1999 | * by computing it, but we might not be able to | |
2000 | */ | |
c337869d DW |
2001 | if ((s->uptodate == disks - 1) && |
2002 | (s->failed && (i == r6s->failed_num[0] || | |
2003 | i == r6s->failed_num[1]))) { | |
45b4233c | 2004 | pr_debug("Computing stripe %llu block %d\n", |
a4456856 DW |
2005 | (unsigned long long)sh->sector, i); |
2006 | compute_block_1(sh, i, 0); | |
2007 | s->uptodate++; | |
2008 | } else if ( s->uptodate == disks-2 && s->failed >= 2 ) { | |
2009 | /* Computing 2-failure is *very* expensive; only | |
2010 | * do it if failed >= 2 | |
2011 | */ | |
2012 | int other; | |
2013 | for (other = disks; other--; ) { | |
2014 | if (other == i) | |
2015 | continue; | |
2016 | if (!test_bit(R5_UPTODATE, | |
2017 | &sh->dev[other].flags)) | |
2018 | break; | |
2019 | } | |
2020 | BUG_ON(other < 0); | |
45b4233c | 2021 | pr_debug("Computing stripe %llu blocks %d,%d\n", |
a4456856 DW |
2022 | (unsigned long long)sh->sector, |
2023 | i, other); | |
2024 | compute_block_2(sh, i, other); | |
2025 | s->uptodate += 2; | |
2026 | } else if (test_bit(R5_Insync, &dev->flags)) { | |
2027 | set_bit(R5_LOCKED, &dev->flags); | |
2028 | set_bit(R5_Wantread, &dev->flags); | |
2029 | s->locked++; | |
45b4233c | 2030 | pr_debug("Reading block %d (sync=%d)\n", |
a4456856 DW |
2031 | i, s->syncing); |
2032 | } | |
2033 | } | |
2034 | } | |
2035 | set_bit(STRIPE_HANDLE, &sh->state); | |
2036 | } | |
2037 | ||
2038 | ||
1fe797e6 | 2039 | /* handle_stripe_clean_event |
a4456856 DW |
2040 | * any written block on an uptodate or failed drive can be returned. |
2041 | * Note that if we 'wrote' to a failed drive, it will be UPTODATE, but | |
2042 | * never LOCKED, so we don't need to test 'failed' directly. | |
2043 | */ | |
1fe797e6 | 2044 | static void handle_stripe_clean_event(raid5_conf_t *conf, |
a4456856 DW |
2045 | struct stripe_head *sh, int disks, struct bio **return_bi) |
2046 | { | |
2047 | int i; | |
2048 | struct r5dev *dev; | |
2049 | ||
2050 | for (i = disks; i--; ) | |
2051 | if (sh->dev[i].written) { | |
2052 | dev = &sh->dev[i]; | |
2053 | if (!test_bit(R5_LOCKED, &dev->flags) && | |
2054 | test_bit(R5_UPTODATE, &dev->flags)) { | |
2055 | /* We can return any write requests */ | |
2056 | struct bio *wbi, *wbi2; | |
2057 | int bitmap_end = 0; | |
45b4233c | 2058 | pr_debug("Return write for disc %d\n", i); |
a4456856 DW |
2059 | spin_lock_irq(&conf->device_lock); |
2060 | wbi = dev->written; | |
2061 | dev->written = NULL; | |
2062 | while (wbi && wbi->bi_sector < | |
2063 | dev->sector + STRIPE_SECTORS) { | |
2064 | wbi2 = r5_next_bio(wbi, dev->sector); | |
960e739d | 2065 | if (!raid5_dec_bi_phys_segments(wbi)) { |
a4456856 DW |
2066 | md_write_end(conf->mddev); |
2067 | wbi->bi_next = *return_bi; | |
2068 | *return_bi = wbi; | |
2069 | } | |
2070 | wbi = wbi2; | |
2071 | } | |
2072 | if (dev->towrite == NULL) | |
2073 | bitmap_end = 1; | |
2074 | spin_unlock_irq(&conf->device_lock); | |
2075 | if (bitmap_end) | |
2076 | bitmap_endwrite(conf->mddev->bitmap, | |
2077 | sh->sector, | |
2078 | STRIPE_SECTORS, | |
2079 | !test_bit(STRIPE_DEGRADED, &sh->state), | |
2080 | 0); | |
2081 | } | |
2082 | } | |
8b3e6cdc DW |
2083 | |
2084 | if (test_and_clear_bit(STRIPE_FULL_WRITE, &sh->state)) | |
2085 | if (atomic_dec_and_test(&conf->pending_full_writes)) | |
2086 | md_wakeup_thread(conf->mddev->thread); | |
a4456856 DW |
2087 | } |
2088 | ||
1fe797e6 | 2089 | static void handle_stripe_dirtying5(raid5_conf_t *conf, |
a4456856 DW |
2090 | struct stripe_head *sh, struct stripe_head_state *s, int disks) |
2091 | { | |
2092 | int rmw = 0, rcw = 0, i; | |
2093 | for (i = disks; i--; ) { | |
2094 | /* would I have to read this buffer for read_modify_write */ | |
2095 | struct r5dev *dev = &sh->dev[i]; | |
2096 | if ((dev->towrite || i == sh->pd_idx) && | |
2097 | !test_bit(R5_LOCKED, &dev->flags) && | |
f38e1219 DW |
2098 | !(test_bit(R5_UPTODATE, &dev->flags) || |
2099 | test_bit(R5_Wantcompute, &dev->flags))) { | |
a4456856 DW |
2100 | if (test_bit(R5_Insync, &dev->flags)) |
2101 | rmw++; | |
2102 | else | |
2103 | rmw += 2*disks; /* cannot read it */ | |
2104 | } | |
2105 | /* Would I have to read this buffer for reconstruct_write */ | |
2106 | if (!test_bit(R5_OVERWRITE, &dev->flags) && i != sh->pd_idx && | |
2107 | !test_bit(R5_LOCKED, &dev->flags) && | |
f38e1219 DW |
2108 | !(test_bit(R5_UPTODATE, &dev->flags) || |
2109 | test_bit(R5_Wantcompute, &dev->flags))) { | |
2110 | if (test_bit(R5_Insync, &dev->flags)) rcw++; | |
a4456856 DW |
2111 | else |
2112 | rcw += 2*disks; | |
2113 | } | |
2114 | } | |
45b4233c | 2115 | pr_debug("for sector %llu, rmw=%d rcw=%d\n", |
a4456856 DW |
2116 | (unsigned long long)sh->sector, rmw, rcw); |
2117 | set_bit(STRIPE_HANDLE, &sh->state); | |
2118 | if (rmw < rcw && rmw > 0) | |
2119 | /* prefer read-modify-write, but need to get some data */ | |
2120 | for (i = disks; i--; ) { | |
2121 | struct r5dev *dev = &sh->dev[i]; | |
2122 | if ((dev->towrite || i == sh->pd_idx) && | |
2123 | !test_bit(R5_LOCKED, &dev->flags) && | |
f38e1219 DW |
2124 | !(test_bit(R5_UPTODATE, &dev->flags) || |
2125 | test_bit(R5_Wantcompute, &dev->flags)) && | |
a4456856 DW |
2126 | test_bit(R5_Insync, &dev->flags)) { |
2127 | if ( | |
2128 | test_bit(STRIPE_PREREAD_ACTIVE, &sh->state)) { | |
45b4233c | 2129 | pr_debug("Read_old block " |
a4456856 DW |
2130 | "%d for r-m-w\n", i); |
2131 | set_bit(R5_LOCKED, &dev->flags); | |
2132 | set_bit(R5_Wantread, &dev->flags); | |
2133 | s->locked++; | |
2134 | } else { | |
2135 | set_bit(STRIPE_DELAYED, &sh->state); | |
2136 | set_bit(STRIPE_HANDLE, &sh->state); | |
2137 | } | |
2138 | } | |
2139 | } | |
2140 | if (rcw <= rmw && rcw > 0) | |
2141 | /* want reconstruct write, but need to get some data */ | |
2142 | for (i = disks; i--; ) { | |
2143 | struct r5dev *dev = &sh->dev[i]; | |
2144 | if (!test_bit(R5_OVERWRITE, &dev->flags) && | |
2145 | i != sh->pd_idx && | |
2146 | !test_bit(R5_LOCKED, &dev->flags) && | |
f38e1219 DW |
2147 | !(test_bit(R5_UPTODATE, &dev->flags) || |
2148 | test_bit(R5_Wantcompute, &dev->flags)) && | |
a4456856 DW |
2149 | test_bit(R5_Insync, &dev->flags)) { |
2150 | if ( | |
2151 | test_bit(STRIPE_PREREAD_ACTIVE, &sh->state)) { | |
45b4233c | 2152 | pr_debug("Read_old block " |
a4456856 DW |
2153 | "%d for Reconstruct\n", i); |
2154 | set_bit(R5_LOCKED, &dev->flags); | |
2155 | set_bit(R5_Wantread, &dev->flags); | |
2156 | s->locked++; | |
2157 | } else { | |
2158 | set_bit(STRIPE_DELAYED, &sh->state); | |
2159 | set_bit(STRIPE_HANDLE, &sh->state); | |
2160 | } | |
2161 | } | |
2162 | } | |
2163 | /* now if nothing is locked, and if we have enough data, | |
2164 | * we can start a write request | |
2165 | */ | |
f38e1219 DW |
2166 | /* since handle_stripe can be called at any time we need to handle the |
2167 | * case where a compute block operation has been submitted and then a | |
2168 | * subsequent call wants to start a write request. raid5_run_ops only | |
2169 | * handles the case where compute block and postxor are requested | |
2170 | * simultaneously. If this is not the case then new writes need to be | |
2171 | * held off until the compute completes. | |
2172 | */ | |
976ea8d4 DW |
2173 | if ((s->req_compute || !test_bit(STRIPE_COMPUTE_RUN, &sh->state)) && |
2174 | (s->locked == 0 && (rcw == 0 || rmw == 0) && | |
2175 | !test_bit(STRIPE_BIT_DELAY, &sh->state))) | |
1fe797e6 | 2176 | schedule_reconstruction5(sh, s, rcw == 0, 0); |
a4456856 DW |
2177 | } |
2178 | ||
1fe797e6 | 2179 | static void handle_stripe_dirtying6(raid5_conf_t *conf, |
a4456856 DW |
2180 | struct stripe_head *sh, struct stripe_head_state *s, |
2181 | struct r6_state *r6s, int disks) | |
2182 | { | |
2183 | int rcw = 0, must_compute = 0, pd_idx = sh->pd_idx, i; | |
2184 | int qd_idx = r6s->qd_idx; | |
2185 | for (i = disks; i--; ) { | |
2186 | struct r5dev *dev = &sh->dev[i]; | |
2187 | /* Would I have to read this buffer for reconstruct_write */ | |
2188 | if (!test_bit(R5_OVERWRITE, &dev->flags) | |
2189 | && i != pd_idx && i != qd_idx | |
2190 | && (!test_bit(R5_LOCKED, &dev->flags) | |
2191 | ) && | |
2192 | !test_bit(R5_UPTODATE, &dev->flags)) { | |
2193 | if (test_bit(R5_Insync, &dev->flags)) rcw++; | |
2194 | else { | |
45b4233c | 2195 | pr_debug("raid6: must_compute: " |
a4456856 DW |
2196 | "disk %d flags=%#lx\n", i, dev->flags); |
2197 | must_compute++; | |
2198 | } | |
2199 | } | |
2200 | } | |
45b4233c | 2201 | pr_debug("for sector %llu, rcw=%d, must_compute=%d\n", |
a4456856 DW |
2202 | (unsigned long long)sh->sector, rcw, must_compute); |
2203 | set_bit(STRIPE_HANDLE, &sh->state); | |
2204 | ||
2205 | if (rcw > 0) | |
2206 | /* want reconstruct write, but need to get some data */ | |
2207 | for (i = disks; i--; ) { | |
2208 | struct r5dev *dev = &sh->dev[i]; | |
2209 | if (!test_bit(R5_OVERWRITE, &dev->flags) | |
2210 | && !(s->failed == 0 && (i == pd_idx || i == qd_idx)) | |
2211 | && !test_bit(R5_LOCKED, &dev->flags) && | |
2212 | !test_bit(R5_UPTODATE, &dev->flags) && | |
2213 | test_bit(R5_Insync, &dev->flags)) { | |
2214 | if ( | |
2215 | test_bit(STRIPE_PREREAD_ACTIVE, &sh->state)) { | |
45b4233c | 2216 | pr_debug("Read_old stripe %llu " |
a4456856 DW |
2217 | "block %d for Reconstruct\n", |
2218 | (unsigned long long)sh->sector, i); | |
2219 | set_bit(R5_LOCKED, &dev->flags); | |
2220 | set_bit(R5_Wantread, &dev->flags); | |
2221 | s->locked++; | |
2222 | } else { | |
45b4233c | 2223 | pr_debug("Request delayed stripe %llu " |
a4456856 DW |
2224 | "block %d for Reconstruct\n", |
2225 | (unsigned long long)sh->sector, i); | |
2226 | set_bit(STRIPE_DELAYED, &sh->state); | |
2227 | set_bit(STRIPE_HANDLE, &sh->state); | |
2228 | } | |
2229 | } | |
2230 | } | |
2231 | /* now if nothing is locked, and if we have enough data, we can start a | |
2232 | * write request | |
2233 | */ | |
2234 | if (s->locked == 0 && rcw == 0 && | |
2235 | !test_bit(STRIPE_BIT_DELAY, &sh->state)) { | |
2236 | if (must_compute > 0) { | |
2237 | /* We have failed blocks and need to compute them */ | |
2238 | switch (s->failed) { | |
2239 | case 0: | |
2240 | BUG(); | |
2241 | case 1: | |
2242 | compute_block_1(sh, r6s->failed_num[0], 0); | |
2243 | break; | |
2244 | case 2: | |
2245 | compute_block_2(sh, r6s->failed_num[0], | |
2246 | r6s->failed_num[1]); | |
2247 | break; | |
2248 | default: /* This request should have been failed? */ | |
2249 | BUG(); | |
2250 | } | |
2251 | } | |
2252 | ||
45b4233c | 2253 | pr_debug("Computing parity for stripe %llu\n", |
a4456856 DW |
2254 | (unsigned long long)sh->sector); |
2255 | compute_parity6(sh, RECONSTRUCT_WRITE); | |
2256 | /* now every locked buffer is ready to be written */ | |
2257 | for (i = disks; i--; ) | |
2258 | if (test_bit(R5_LOCKED, &sh->dev[i].flags)) { | |
45b4233c | 2259 | pr_debug("Writing stripe %llu block %d\n", |
a4456856 DW |
2260 | (unsigned long long)sh->sector, i); |
2261 | s->locked++; | |
2262 | set_bit(R5_Wantwrite, &sh->dev[i].flags); | |
2263 | } | |
8b3e6cdc DW |
2264 | if (s->locked == disks) |
2265 | if (!test_and_set_bit(STRIPE_FULL_WRITE, &sh->state)) | |
2266 | atomic_inc(&conf->pending_full_writes); | |
a4456856 DW |
2267 | /* after a RECONSTRUCT_WRITE, the stripe MUST be in-sync */ |
2268 | set_bit(STRIPE_INSYNC, &sh->state); | |
2269 | ||
2270 | if (test_and_clear_bit(STRIPE_PREREAD_ACTIVE, &sh->state)) { | |
2271 | atomic_dec(&conf->preread_active_stripes); | |
2272 | if (atomic_read(&conf->preread_active_stripes) < | |
2273 | IO_THRESHOLD) | |
2274 | md_wakeup_thread(conf->mddev->thread); | |
2275 | } | |
2276 | } | |
2277 | } | |
2278 | ||
2279 | static void handle_parity_checks5(raid5_conf_t *conf, struct stripe_head *sh, | |
2280 | struct stripe_head_state *s, int disks) | |
2281 | { | |
ecc65c9b | 2282 | struct r5dev *dev = NULL; |
bd2ab670 | 2283 | |
a4456856 | 2284 | set_bit(STRIPE_HANDLE, &sh->state); |
e89f8962 | 2285 | |
ecc65c9b DW |
2286 | switch (sh->check_state) { |
2287 | case check_state_idle: | |
2288 | /* start a new check operation if there are no failures */ | |
bd2ab670 | 2289 | if (s->failed == 0) { |
bd2ab670 | 2290 | BUG_ON(s->uptodate != disks); |
ecc65c9b DW |
2291 | sh->check_state = check_state_run; |
2292 | set_bit(STRIPE_OP_CHECK, &s->ops_request); | |
bd2ab670 | 2293 | clear_bit(R5_UPTODATE, &sh->dev[sh->pd_idx].flags); |
bd2ab670 | 2294 | s->uptodate--; |
ecc65c9b | 2295 | break; |
bd2ab670 | 2296 | } |
ecc65c9b DW |
2297 | dev = &sh->dev[s->failed_num]; |
2298 | /* fall through */ | |
2299 | case check_state_compute_result: | |
2300 | sh->check_state = check_state_idle; | |
2301 | if (!dev) | |
2302 | dev = &sh->dev[sh->pd_idx]; | |
2303 | ||
2304 | /* check that a write has not made the stripe insync */ | |
2305 | if (test_bit(STRIPE_INSYNC, &sh->state)) | |
2306 | break; | |
c8894419 | 2307 | |
a4456856 | 2308 | /* either failed parity check, or recovery is happening */ |
a4456856 DW |
2309 | BUG_ON(!test_bit(R5_UPTODATE, &dev->flags)); |
2310 | BUG_ON(s->uptodate != disks); | |
2311 | ||
2312 | set_bit(R5_LOCKED, &dev->flags); | |
ecc65c9b | 2313 | s->locked++; |
a4456856 | 2314 | set_bit(R5_Wantwrite, &dev->flags); |
830ea016 | 2315 | |
a4456856 | 2316 | clear_bit(STRIPE_DEGRADED, &sh->state); |
a4456856 | 2317 | set_bit(STRIPE_INSYNC, &sh->state); |
ecc65c9b DW |
2318 | break; |
2319 | case check_state_run: | |
2320 | break; /* we will be called again upon completion */ | |
2321 | case check_state_check_result: | |
2322 | sh->check_state = check_state_idle; | |
2323 | ||
2324 | /* if a failure occurred during the check operation, leave | |
2325 | * STRIPE_INSYNC not set and let the stripe be handled again | |
2326 | */ | |
2327 | if (s->failed) | |
2328 | break; | |
2329 | ||
2330 | /* handle a successful check operation, if parity is correct | |
2331 | * we are done. Otherwise update the mismatch count and repair | |
2332 | * parity if !MD_RECOVERY_CHECK | |
2333 | */ | |
2334 | if (sh->ops.zero_sum_result == 0) | |
2335 | /* parity is correct (on disc, | |
2336 | * not in buffer any more) | |
2337 | */ | |
2338 | set_bit(STRIPE_INSYNC, &sh->state); | |
2339 | else { | |
2340 | conf->mddev->resync_mismatches += STRIPE_SECTORS; | |
2341 | if (test_bit(MD_RECOVERY_CHECK, &conf->mddev->recovery)) | |
2342 | /* don't try to repair!! */ | |
2343 | set_bit(STRIPE_INSYNC, &sh->state); | |
2344 | else { | |
2345 | sh->check_state = check_state_compute_run; | |
976ea8d4 | 2346 | set_bit(STRIPE_COMPUTE_RUN, &sh->state); |
ecc65c9b DW |
2347 | set_bit(STRIPE_OP_COMPUTE_BLK, &s->ops_request); |
2348 | set_bit(R5_Wantcompute, | |
2349 | &sh->dev[sh->pd_idx].flags); | |
2350 | sh->ops.target = sh->pd_idx; | |
2351 | s->uptodate++; | |
2352 | } | |
2353 | } | |
2354 | break; | |
2355 | case check_state_compute_run: | |
2356 | break; | |
2357 | default: | |
2358 | printk(KERN_ERR "%s: unknown check_state: %d sector: %llu\n", | |
2359 | __func__, sh->check_state, | |
2360 | (unsigned long long) sh->sector); | |
2361 | BUG(); | |
a4456856 DW |
2362 | } |
2363 | } | |
2364 | ||
2365 | ||
2366 | static void handle_parity_checks6(raid5_conf_t *conf, struct stripe_head *sh, | |
2367 | struct stripe_head_state *s, | |
2368 | struct r6_state *r6s, struct page *tmp_page, | |
2369 | int disks) | |
2370 | { | |
2371 | int update_p = 0, update_q = 0; | |
2372 | struct r5dev *dev; | |
2373 | int pd_idx = sh->pd_idx; | |
2374 | int qd_idx = r6s->qd_idx; | |
2375 | ||
2376 | set_bit(STRIPE_HANDLE, &sh->state); | |
2377 | ||
2378 | BUG_ON(s->failed > 2); | |
2379 | BUG_ON(s->uptodate < disks); | |
2380 | /* Want to check and possibly repair P and Q. | |
2381 | * However there could be one 'failed' device, in which | |
2382 | * case we can only check one of them, possibly using the | |
2383 | * other to generate missing data | |
2384 | */ | |
2385 | ||
2386 | /* If !tmp_page, we cannot do the calculations, | |
2387 | * but as we have set STRIPE_HANDLE, we will soon be called | |
2388 | * by stripe_handle with a tmp_page - just wait until then. | |
2389 | */ | |
2390 | if (tmp_page) { | |
2391 | if (s->failed == r6s->q_failed) { | |
2392 | /* The only possible failed device holds 'Q', so it | |
2393 | * makes sense to check P (If anything else were failed, | |
2394 | * we would have used P to recreate it). | |
2395 | */ | |
2396 | compute_block_1(sh, pd_idx, 1); | |
2397 | if (!page_is_zero(sh->dev[pd_idx].page)) { | |
2398 | compute_block_1(sh, pd_idx, 0); | |
2399 | update_p = 1; | |
2400 | } | |
2401 | } | |
2402 | if (!r6s->q_failed && s->failed < 2) { | |
2403 | /* q is not failed, and we didn't use it to generate | |
2404 | * anything, so it makes sense to check it | |
2405 | */ | |
2406 | memcpy(page_address(tmp_page), | |
2407 | page_address(sh->dev[qd_idx].page), | |
2408 | STRIPE_SIZE); | |
2409 | compute_parity6(sh, UPDATE_PARITY); | |
2410 | if (memcmp(page_address(tmp_page), | |
2411 | page_address(sh->dev[qd_idx].page), | |
2412 | STRIPE_SIZE) != 0) { | |
2413 | clear_bit(STRIPE_INSYNC, &sh->state); | |
2414 | update_q = 1; | |
2415 | } | |
2416 | } | |
2417 | if (update_p || update_q) { | |
2418 | conf->mddev->resync_mismatches += STRIPE_SECTORS; | |
2419 | if (test_bit(MD_RECOVERY_CHECK, &conf->mddev->recovery)) | |
2420 | /* don't try to repair!! */ | |
2421 | update_p = update_q = 0; | |
2422 | } | |
2423 | ||
2424 | /* now write out any block on a failed drive, | |
2425 | * or P or Q if they need it | |
2426 | */ | |
2427 | ||
2428 | if (s->failed == 2) { | |
2429 | dev = &sh->dev[r6s->failed_num[1]]; | |
2430 | s->locked++; | |
2431 | set_bit(R5_LOCKED, &dev->flags); | |
2432 | set_bit(R5_Wantwrite, &dev->flags); | |
2433 | } | |
2434 | if (s->failed >= 1) { | |
2435 | dev = &sh->dev[r6s->failed_num[0]]; | |
2436 | s->locked++; | |
2437 | set_bit(R5_LOCKED, &dev->flags); | |
2438 | set_bit(R5_Wantwrite, &dev->flags); | |
2439 | } | |
2440 | ||
2441 | if (update_p) { | |
2442 | dev = &sh->dev[pd_idx]; | |
2443 | s->locked++; | |
2444 | set_bit(R5_LOCKED, &dev->flags); | |
2445 | set_bit(R5_Wantwrite, &dev->flags); | |
2446 | } | |
2447 | if (update_q) { | |
2448 | dev = &sh->dev[qd_idx]; | |
2449 | s->locked++; | |
2450 | set_bit(R5_LOCKED, &dev->flags); | |
2451 | set_bit(R5_Wantwrite, &dev->flags); | |
2452 | } | |
2453 | clear_bit(STRIPE_DEGRADED, &sh->state); | |
2454 | ||
2455 | set_bit(STRIPE_INSYNC, &sh->state); | |
2456 | } | |
2457 | } | |
2458 | ||
2459 | static void handle_stripe_expansion(raid5_conf_t *conf, struct stripe_head *sh, | |
2460 | struct r6_state *r6s) | |
2461 | { | |
2462 | int i; | |
2463 | ||
2464 | /* We have read all the blocks in this stripe and now we need to | |
2465 | * copy some of them into a target stripe for expand. | |
2466 | */ | |
f0a50d37 | 2467 | struct dma_async_tx_descriptor *tx = NULL; |
a4456856 DW |
2468 | clear_bit(STRIPE_EXPAND_SOURCE, &sh->state); |
2469 | for (i = 0; i < sh->disks; i++) | |
a2e08551 | 2470 | if (i != sh->pd_idx && (!r6s || i != r6s->qd_idx)) { |
a4456856 DW |
2471 | int dd_idx, pd_idx, j; |
2472 | struct stripe_head *sh2; | |
2473 | ||
2474 | sector_t bn = compute_blocknr(sh, i); | |
2475 | sector_t s = raid5_compute_sector(bn, conf->raid_disks, | |
2476 | conf->raid_disks - | |
2477 | conf->max_degraded, &dd_idx, | |
2478 | &pd_idx, conf); | |
2479 | sh2 = get_active_stripe(conf, s, conf->raid_disks, | |
2480 | pd_idx, 1); | |
2481 | if (sh2 == NULL) | |
2482 | /* so far only the early blocks of this stripe | |
2483 | * have been requested. When later blocks | |
2484 | * get requested, we will try again | |
2485 | */ | |
2486 | continue; | |
2487 | if (!test_bit(STRIPE_EXPANDING, &sh2->state) || | |
2488 | test_bit(R5_Expanded, &sh2->dev[dd_idx].flags)) { | |
2489 | /* must have already done this block */ | |
2490 | release_stripe(sh2); | |
2491 | continue; | |
2492 | } | |
f0a50d37 DW |
2493 | |
2494 | /* place all the copies on one channel */ | |
2495 | tx = async_memcpy(sh2->dev[dd_idx].page, | |
2496 | sh->dev[i].page, 0, 0, STRIPE_SIZE, | |
2497 | ASYNC_TX_DEP_ACK, tx, NULL, NULL); | |
2498 | ||
a4456856 DW |
2499 | set_bit(R5_Expanded, &sh2->dev[dd_idx].flags); |
2500 | set_bit(R5_UPTODATE, &sh2->dev[dd_idx].flags); | |
2501 | for (j = 0; j < conf->raid_disks; j++) | |
2502 | if (j != sh2->pd_idx && | |
a2e08551 N |
2503 | (!r6s || j != raid6_next_disk(sh2->pd_idx, |
2504 | sh2->disks)) && | |
a4456856 DW |
2505 | !test_bit(R5_Expanded, &sh2->dev[j].flags)) |
2506 | break; | |
2507 | if (j == conf->raid_disks) { | |
2508 | set_bit(STRIPE_EXPAND_READY, &sh2->state); | |
2509 | set_bit(STRIPE_HANDLE, &sh2->state); | |
2510 | } | |
2511 | release_stripe(sh2); | |
f0a50d37 | 2512 | |
a4456856 | 2513 | } |
a2e08551 N |
2514 | /* done submitting copies, wait for them to complete */ |
2515 | if (tx) { | |
2516 | async_tx_ack(tx); | |
2517 | dma_wait_for_async_tx(tx); | |
2518 | } | |
a4456856 | 2519 | } |
1da177e4 | 2520 | |
6bfe0b49 | 2521 | |
1da177e4 LT |
2522 | /* |
2523 | * handle_stripe - do things to a stripe. | |
2524 | * | |
2525 | * We lock the stripe and then examine the state of various bits | |
2526 | * to see what needs to be done. | |
2527 | * Possible results: | |
2528 | * return some read request which now have data | |
2529 | * return some write requests which are safely on disc | |
2530 | * schedule a read on some buffers | |
2531 | * schedule a write of some buffers | |
2532 | * return confirmation of parity correctness | |
2533 | * | |
1da177e4 LT |
2534 | * buffers are taken off read_list or write_list, and bh_cache buffers |
2535 | * get BH_Lock set before the stripe lock is released. | |
2536 | * | |
2537 | */ | |
a4456856 | 2538 | |
df10cfbc | 2539 | static bool handle_stripe5(struct stripe_head *sh) |
1da177e4 LT |
2540 | { |
2541 | raid5_conf_t *conf = sh->raid_conf; | |
a4456856 DW |
2542 | int disks = sh->disks, i; |
2543 | struct bio *return_bi = NULL; | |
2544 | struct stripe_head_state s; | |
1da177e4 | 2545 | struct r5dev *dev; |
6bfe0b49 | 2546 | mdk_rdev_t *blocked_rdev = NULL; |
e0a115e5 | 2547 | int prexor; |
1da177e4 | 2548 | |
a4456856 | 2549 | memset(&s, 0, sizeof(s)); |
600aa109 DW |
2550 | pr_debug("handling stripe %llu, state=%#lx cnt=%d, pd_idx=%d check:%d " |
2551 | "reconstruct:%d\n", (unsigned long long)sh->sector, sh->state, | |
2552 | atomic_read(&sh->count), sh->pd_idx, sh->check_state, | |
2553 | sh->reconstruct_state); | |
1da177e4 LT |
2554 | |
2555 | spin_lock(&sh->lock); | |
2556 | clear_bit(STRIPE_HANDLE, &sh->state); | |
2557 | clear_bit(STRIPE_DELAYED, &sh->state); | |
2558 | ||
a4456856 DW |
2559 | s.syncing = test_bit(STRIPE_SYNCING, &sh->state); |
2560 | s.expanding = test_bit(STRIPE_EXPAND_SOURCE, &sh->state); | |
2561 | s.expanded = test_bit(STRIPE_EXPAND_READY, &sh->state); | |
def6ae26 | 2562 | |
83de75cc | 2563 | /* Now to look around and see what can be done */ |
9910f16a | 2564 | rcu_read_lock(); |
1da177e4 LT |
2565 | for (i=disks; i--; ) { |
2566 | mdk_rdev_t *rdev; | |
a4456856 | 2567 | struct r5dev *dev = &sh->dev[i]; |
1da177e4 | 2568 | clear_bit(R5_Insync, &dev->flags); |
1da177e4 | 2569 | |
b5e98d65 DW |
2570 | pr_debug("check %d: state 0x%lx toread %p read %p write %p " |
2571 | "written %p\n", i, dev->flags, dev->toread, dev->read, | |
2572 | dev->towrite, dev->written); | |
2573 | ||
2574 | /* maybe we can request a biofill operation | |
2575 | * | |
2576 | * new wantfill requests are only permitted while | |
83de75cc | 2577 | * ops_complete_biofill is guaranteed to be inactive |
b5e98d65 DW |
2578 | */ |
2579 | if (test_bit(R5_UPTODATE, &dev->flags) && dev->toread && | |
83de75cc | 2580 | !test_bit(STRIPE_BIOFILL_RUN, &sh->state)) |
b5e98d65 | 2581 | set_bit(R5_Wantfill, &dev->flags); |
1da177e4 LT |
2582 | |
2583 | /* now count some things */ | |
a4456856 DW |
2584 | if (test_bit(R5_LOCKED, &dev->flags)) s.locked++; |
2585 | if (test_bit(R5_UPTODATE, &dev->flags)) s.uptodate++; | |
f38e1219 | 2586 | if (test_bit(R5_Wantcompute, &dev->flags)) s.compute++; |
1da177e4 | 2587 | |
b5e98d65 DW |
2588 | if (test_bit(R5_Wantfill, &dev->flags)) |
2589 | s.to_fill++; | |
2590 | else if (dev->toread) | |
a4456856 | 2591 | s.to_read++; |
1da177e4 | 2592 | if (dev->towrite) { |
a4456856 | 2593 | s.to_write++; |
1da177e4 | 2594 | if (!test_bit(R5_OVERWRITE, &dev->flags)) |
a4456856 | 2595 | s.non_overwrite++; |
1da177e4 | 2596 | } |
a4456856 DW |
2597 | if (dev->written) |
2598 | s.written++; | |
9910f16a | 2599 | rdev = rcu_dereference(conf->disks[i].rdev); |
ac4090d2 N |
2600 | if (blocked_rdev == NULL && |
2601 | rdev && unlikely(test_bit(Blocked, &rdev->flags))) { | |
6bfe0b49 DW |
2602 | blocked_rdev = rdev; |
2603 | atomic_inc(&rdev->nr_pending); | |
6bfe0b49 | 2604 | } |
b2d444d7 | 2605 | if (!rdev || !test_bit(In_sync, &rdev->flags)) { |
14f8d26b | 2606 | /* The ReadError flag will just be confusing now */ |
4e5314b5 N |
2607 | clear_bit(R5_ReadError, &dev->flags); |
2608 | clear_bit(R5_ReWrite, &dev->flags); | |
2609 | } | |
b2d444d7 | 2610 | if (!rdev || !test_bit(In_sync, &rdev->flags) |
4e5314b5 | 2611 | || test_bit(R5_ReadError, &dev->flags)) { |
a4456856 DW |
2612 | s.failed++; |
2613 | s.failed_num = i; | |
1da177e4 LT |
2614 | } else |
2615 | set_bit(R5_Insync, &dev->flags); | |
2616 | } | |
9910f16a | 2617 | rcu_read_unlock(); |
b5e98d65 | 2618 | |
6bfe0b49 | 2619 | if (unlikely(blocked_rdev)) { |
ac4090d2 N |
2620 | if (s.syncing || s.expanding || s.expanded || |
2621 | s.to_write || s.written) { | |
2622 | set_bit(STRIPE_HANDLE, &sh->state); | |
2623 | goto unlock; | |
2624 | } | |
2625 | /* There is nothing for the blocked_rdev to block */ | |
2626 | rdev_dec_pending(blocked_rdev, conf->mddev); | |
2627 | blocked_rdev = NULL; | |
6bfe0b49 DW |
2628 | } |
2629 | ||
83de75cc DW |
2630 | if (s.to_fill && !test_bit(STRIPE_BIOFILL_RUN, &sh->state)) { |
2631 | set_bit(STRIPE_OP_BIOFILL, &s.ops_request); | |
2632 | set_bit(STRIPE_BIOFILL_RUN, &sh->state); | |
2633 | } | |
b5e98d65 | 2634 | |
45b4233c | 2635 | pr_debug("locked=%d uptodate=%d to_read=%d" |
1da177e4 | 2636 | " to_write=%d failed=%d failed_num=%d\n", |
a4456856 DW |
2637 | s.locked, s.uptodate, s.to_read, s.to_write, |
2638 | s.failed, s.failed_num); | |
1da177e4 LT |
2639 | /* check if the array has lost two devices and, if so, some requests might |
2640 | * need to be failed | |
2641 | */ | |
a4456856 | 2642 | if (s.failed > 1 && s.to_read+s.to_write+s.written) |
1fe797e6 | 2643 | handle_failed_stripe(conf, sh, &s, disks, &return_bi); |
a4456856 | 2644 | if (s.failed > 1 && s.syncing) { |
1da177e4 LT |
2645 | md_done_sync(conf->mddev, STRIPE_SECTORS,0); |
2646 | clear_bit(STRIPE_SYNCING, &sh->state); | |
a4456856 | 2647 | s.syncing = 0; |
1da177e4 LT |
2648 | } |
2649 | ||
2650 | /* might be able to return some write requests if the parity block | |
2651 | * is safe, or on a failed drive | |
2652 | */ | |
2653 | dev = &sh->dev[sh->pd_idx]; | |
a4456856 DW |
2654 | if ( s.written && |
2655 | ((test_bit(R5_Insync, &dev->flags) && | |
2656 | !test_bit(R5_LOCKED, &dev->flags) && | |
2657 | test_bit(R5_UPTODATE, &dev->flags)) || | |
2658 | (s.failed == 1 && s.failed_num == sh->pd_idx))) | |
1fe797e6 | 2659 | handle_stripe_clean_event(conf, sh, disks, &return_bi); |
1da177e4 LT |
2660 | |
2661 | /* Now we might consider reading some blocks, either to check/generate | |
2662 | * parity, or to satisfy requests | |
2663 | * or to load a block that is being partially written. | |
2664 | */ | |
a4456856 | 2665 | if (s.to_read || s.non_overwrite || |
976ea8d4 | 2666 | (s.syncing && (s.uptodate + s.compute < disks)) || s.expanding) |
1fe797e6 | 2667 | handle_stripe_fill5(sh, &s, disks); |
1da177e4 | 2668 | |
e33129d8 DW |
2669 | /* Now we check to see if any write operations have recently |
2670 | * completed | |
2671 | */ | |
e0a115e5 | 2672 | prexor = 0; |
d8ee0728 | 2673 | if (sh->reconstruct_state == reconstruct_state_prexor_drain_result) |
e0a115e5 | 2674 | prexor = 1; |
d8ee0728 DW |
2675 | if (sh->reconstruct_state == reconstruct_state_drain_result || |
2676 | sh->reconstruct_state == reconstruct_state_prexor_drain_result) { | |
600aa109 | 2677 | sh->reconstruct_state = reconstruct_state_idle; |
e33129d8 DW |
2678 | |
2679 | /* All the 'written' buffers and the parity block are ready to | |
2680 | * be written back to disk | |
2681 | */ | |
2682 | BUG_ON(!test_bit(R5_UPTODATE, &sh->dev[sh->pd_idx].flags)); | |
2683 | for (i = disks; i--; ) { | |
2684 | dev = &sh->dev[i]; | |
2685 | if (test_bit(R5_LOCKED, &dev->flags) && | |
2686 | (i == sh->pd_idx || dev->written)) { | |
2687 | pr_debug("Writing block %d\n", i); | |
2688 | set_bit(R5_Wantwrite, &dev->flags); | |
e0a115e5 DW |
2689 | if (prexor) |
2690 | continue; | |
e33129d8 DW |
2691 | if (!test_bit(R5_Insync, &dev->flags) || |
2692 | (i == sh->pd_idx && s.failed == 0)) | |
2693 | set_bit(STRIPE_INSYNC, &sh->state); | |
2694 | } | |
2695 | } | |
2696 | if (test_and_clear_bit(STRIPE_PREREAD_ACTIVE, &sh->state)) { | |
2697 | atomic_dec(&conf->preread_active_stripes); | |
2698 | if (atomic_read(&conf->preread_active_stripes) < | |
2699 | IO_THRESHOLD) | |
2700 | md_wakeup_thread(conf->mddev->thread); | |
2701 | } | |
2702 | } | |
2703 | ||
2704 | /* Now to consider new write requests and what else, if anything | |
2705 | * should be read. We do not handle new writes when: | |
2706 | * 1/ A 'write' operation (copy+xor) is already in flight. | |
2707 | * 2/ A 'check' operation is in flight, as it may clobber the parity | |
2708 | * block. | |
2709 | */ | |
600aa109 | 2710 | if (s.to_write && !sh->reconstruct_state && !sh->check_state) |
1fe797e6 | 2711 | handle_stripe_dirtying5(conf, sh, &s, disks); |
1da177e4 LT |
2712 | |
2713 | /* maybe we need to check and possibly fix the parity for this stripe | |
e89f8962 DW |
2714 | * Any reads will already have been scheduled, so we just see if enough |
2715 | * data is available. The parity check is held off while parity | |
2716 | * dependent operations are in flight. | |
1da177e4 | 2717 | */ |
ecc65c9b DW |
2718 | if (sh->check_state || |
2719 | (s.syncing && s.locked == 0 && | |
976ea8d4 | 2720 | !test_bit(STRIPE_COMPUTE_RUN, &sh->state) && |
ecc65c9b | 2721 | !test_bit(STRIPE_INSYNC, &sh->state))) |
a4456856 | 2722 | handle_parity_checks5(conf, sh, &s, disks); |
e89f8962 | 2723 | |
a4456856 | 2724 | if (s.syncing && s.locked == 0 && test_bit(STRIPE_INSYNC, &sh->state)) { |
1da177e4 LT |
2725 | md_done_sync(conf->mddev, STRIPE_SECTORS,1); |
2726 | clear_bit(STRIPE_SYNCING, &sh->state); | |
2727 | } | |
4e5314b5 N |
2728 | |
2729 | /* If the failed drive is just a ReadError, then we might need to progress | |
2730 | * the repair/check process | |
2731 | */ | |
a4456856 DW |
2732 | if (s.failed == 1 && !conf->mddev->ro && |
2733 | test_bit(R5_ReadError, &sh->dev[s.failed_num].flags) | |
2734 | && !test_bit(R5_LOCKED, &sh->dev[s.failed_num].flags) | |
2735 | && test_bit(R5_UPTODATE, &sh->dev[s.failed_num].flags) | |
4e5314b5 | 2736 | ) { |
a4456856 | 2737 | dev = &sh->dev[s.failed_num]; |
4e5314b5 N |
2738 | if (!test_bit(R5_ReWrite, &dev->flags)) { |
2739 | set_bit(R5_Wantwrite, &dev->flags); | |
2740 | set_bit(R5_ReWrite, &dev->flags); | |
2741 | set_bit(R5_LOCKED, &dev->flags); | |
a4456856 | 2742 | s.locked++; |
4e5314b5 N |
2743 | } else { |
2744 | /* let's read it back */ | |
2745 | set_bit(R5_Wantread, &dev->flags); | |
2746 | set_bit(R5_LOCKED, &dev->flags); | |
a4456856 | 2747 | s.locked++; |
4e5314b5 N |
2748 | } |
2749 | } | |
2750 | ||
600aa109 DW |
2751 | /* Finish reconstruct operations initiated by the expansion process */ |
2752 | if (sh->reconstruct_state == reconstruct_state_result) { | |
2753 | sh->reconstruct_state = reconstruct_state_idle; | |
f0a50d37 | 2754 | clear_bit(STRIPE_EXPANDING, &sh->state); |
23397883 | 2755 | for (i = conf->raid_disks; i--; ) { |
ccfcc3c1 | 2756 | set_bit(R5_Wantwrite, &sh->dev[i].flags); |
23397883 | 2757 | set_bit(R5_LOCKED, &sh->dev[i].flags); |
efe31143 | 2758 | s.locked++; |
23397883 | 2759 | } |
f0a50d37 DW |
2760 | } |
2761 | ||
2762 | if (s.expanded && test_bit(STRIPE_EXPANDING, &sh->state) && | |
600aa109 | 2763 | !sh->reconstruct_state) { |
f0a50d37 DW |
2764 | /* Need to write out all blocks after computing parity */ |
2765 | sh->disks = conf->raid_disks; | |
2766 | sh->pd_idx = stripe_to_pdidx(sh->sector, conf, | |
2767 | conf->raid_disks); | |
1fe797e6 | 2768 | schedule_reconstruction5(sh, &s, 1, 1); |
600aa109 | 2769 | } else if (s.expanded && !sh->reconstruct_state && s.locked == 0) { |
ccfcc3c1 | 2770 | clear_bit(STRIPE_EXPAND_READY, &sh->state); |
f6705578 | 2771 | atomic_dec(&conf->reshape_stripes); |
ccfcc3c1 N |
2772 | wake_up(&conf->wait_for_overlap); |
2773 | md_done_sync(conf->mddev, STRIPE_SECTORS, 1); | |
2774 | } | |
2775 | ||
0f94e87c | 2776 | if (s.expanding && s.locked == 0 && |
976ea8d4 | 2777 | !test_bit(STRIPE_COMPUTE_RUN, &sh->state)) |
a4456856 | 2778 | handle_stripe_expansion(conf, sh, NULL); |
ccfcc3c1 | 2779 | |
6bfe0b49 | 2780 | unlock: |
1da177e4 LT |
2781 | spin_unlock(&sh->lock); |
2782 | ||
6bfe0b49 DW |
2783 | /* wait for this device to become unblocked */ |
2784 | if (unlikely(blocked_rdev)) | |
2785 | md_wait_for_blocked_rdev(blocked_rdev, conf->mddev); | |
2786 | ||
600aa109 DW |
2787 | if (s.ops_request) |
2788 | raid5_run_ops(sh, s.ops_request); | |
d84e0f10 | 2789 | |
c4e5ac0a | 2790 | ops_run_io(sh, &s); |
1da177e4 | 2791 | |
a4456856 | 2792 | return_io(return_bi); |
df10cfbc DW |
2793 | |
2794 | return blocked_rdev == NULL; | |
1da177e4 LT |
2795 | } |
2796 | ||
df10cfbc | 2797 | static bool handle_stripe6(struct stripe_head *sh, struct page *tmp_page) |
1da177e4 | 2798 | { |
16a53ecc | 2799 | raid6_conf_t *conf = sh->raid_conf; |
f416885e | 2800 | int disks = sh->disks; |
a4456856 DW |
2801 | struct bio *return_bi = NULL; |
2802 | int i, pd_idx = sh->pd_idx; | |
2803 | struct stripe_head_state s; | |
2804 | struct r6_state r6s; | |
16a53ecc | 2805 | struct r5dev *dev, *pdev, *qdev; |
6bfe0b49 | 2806 | mdk_rdev_t *blocked_rdev = NULL; |
1da177e4 | 2807 | |
a4456856 | 2808 | r6s.qd_idx = raid6_next_disk(pd_idx, disks); |
45b4233c | 2809 | pr_debug("handling stripe %llu, state=%#lx cnt=%d, " |
a4456856 DW |
2810 | "pd_idx=%d, qd_idx=%d\n", |
2811 | (unsigned long long)sh->sector, sh->state, | |
2812 | atomic_read(&sh->count), pd_idx, r6s.qd_idx); | |
2813 | memset(&s, 0, sizeof(s)); | |
72626685 | 2814 | |
16a53ecc N |
2815 | spin_lock(&sh->lock); |
2816 | clear_bit(STRIPE_HANDLE, &sh->state); | |
2817 | clear_bit(STRIPE_DELAYED, &sh->state); | |
2818 | ||
a4456856 DW |
2819 | s.syncing = test_bit(STRIPE_SYNCING, &sh->state); |
2820 | s.expanding = test_bit(STRIPE_EXPAND_SOURCE, &sh->state); | |
2821 | s.expanded = test_bit(STRIPE_EXPAND_READY, &sh->state); | |
16a53ecc | 2822 | /* Now to look around and see what can be done */ |
1da177e4 LT |
2823 | |
2824 | rcu_read_lock(); | |
16a53ecc N |
2825 | for (i=disks; i--; ) { |
2826 | mdk_rdev_t *rdev; | |
2827 | dev = &sh->dev[i]; | |
2828 | clear_bit(R5_Insync, &dev->flags); | |
1da177e4 | 2829 | |
45b4233c | 2830 | pr_debug("check %d: state 0x%lx read %p write %p written %p\n", |
16a53ecc N |
2831 | i, dev->flags, dev->toread, dev->towrite, dev->written); |
2832 | /* maybe we can reply to a read */ | |
2833 | if (test_bit(R5_UPTODATE, &dev->flags) && dev->toread) { | |
2834 | struct bio *rbi, *rbi2; | |
45b4233c | 2835 | pr_debug("Return read for disc %d\n", i); |
16a53ecc N |
2836 | spin_lock_irq(&conf->device_lock); |
2837 | rbi = dev->toread; | |
2838 | dev->toread = NULL; | |
2839 | if (test_and_clear_bit(R5_Overlap, &dev->flags)) | |
2840 | wake_up(&conf->wait_for_overlap); | |
2841 | spin_unlock_irq(&conf->device_lock); | |
2842 | while (rbi && rbi->bi_sector < dev->sector + STRIPE_SECTORS) { | |
2843 | copy_data(0, rbi, dev->page, dev->sector); | |
2844 | rbi2 = r5_next_bio(rbi, dev->sector); | |
2845 | spin_lock_irq(&conf->device_lock); | |
960e739d | 2846 | if (!raid5_dec_bi_phys_segments(rbi)) { |
16a53ecc N |
2847 | rbi->bi_next = return_bi; |
2848 | return_bi = rbi; | |
2849 | } | |
2850 | spin_unlock_irq(&conf->device_lock); | |
2851 | rbi = rbi2; | |
2852 | } | |
2853 | } | |
1da177e4 | 2854 | |
16a53ecc | 2855 | /* now count some things */ |
a4456856 DW |
2856 | if (test_bit(R5_LOCKED, &dev->flags)) s.locked++; |
2857 | if (test_bit(R5_UPTODATE, &dev->flags)) s.uptodate++; | |
1da177e4 | 2858 | |
16a53ecc | 2859 | |
a4456856 DW |
2860 | if (dev->toread) |
2861 | s.to_read++; | |
16a53ecc | 2862 | if (dev->towrite) { |
a4456856 | 2863 | s.to_write++; |
16a53ecc | 2864 | if (!test_bit(R5_OVERWRITE, &dev->flags)) |
a4456856 | 2865 | s.non_overwrite++; |
16a53ecc | 2866 | } |
a4456856 DW |
2867 | if (dev->written) |
2868 | s.written++; | |
16a53ecc | 2869 | rdev = rcu_dereference(conf->disks[i].rdev); |
ac4090d2 N |
2870 | if (blocked_rdev == NULL && |
2871 | rdev && unlikely(test_bit(Blocked, &rdev->flags))) { | |
6bfe0b49 DW |
2872 | blocked_rdev = rdev; |
2873 | atomic_inc(&rdev->nr_pending); | |
6bfe0b49 | 2874 | } |
16a53ecc N |
2875 | if (!rdev || !test_bit(In_sync, &rdev->flags)) { |
2876 | /* The ReadError flag will just be confusing now */ | |
2877 | clear_bit(R5_ReadError, &dev->flags); | |
2878 | clear_bit(R5_ReWrite, &dev->flags); | |
1da177e4 | 2879 | } |
16a53ecc N |
2880 | if (!rdev || !test_bit(In_sync, &rdev->flags) |
2881 | || test_bit(R5_ReadError, &dev->flags)) { | |
a4456856 DW |
2882 | if (s.failed < 2) |
2883 | r6s.failed_num[s.failed] = i; | |
2884 | s.failed++; | |
16a53ecc N |
2885 | } else |
2886 | set_bit(R5_Insync, &dev->flags); | |
1da177e4 LT |
2887 | } |
2888 | rcu_read_unlock(); | |
6bfe0b49 DW |
2889 | |
2890 | if (unlikely(blocked_rdev)) { | |
ac4090d2 N |
2891 | if (s.syncing || s.expanding || s.expanded || |
2892 | s.to_write || s.written) { | |
2893 | set_bit(STRIPE_HANDLE, &sh->state); | |
2894 | goto unlock; | |
2895 | } | |
2896 | /* There is nothing for the blocked_rdev to block */ | |
2897 | rdev_dec_pending(blocked_rdev, conf->mddev); | |
2898 | blocked_rdev = NULL; | |
6bfe0b49 | 2899 | } |
ac4090d2 | 2900 | |
45b4233c | 2901 | pr_debug("locked=%d uptodate=%d to_read=%d" |
16a53ecc | 2902 | " to_write=%d failed=%d failed_num=%d,%d\n", |
a4456856 DW |
2903 | s.locked, s.uptodate, s.to_read, s.to_write, s.failed, |
2904 | r6s.failed_num[0], r6s.failed_num[1]); | |
2905 | /* check if the array has lost >2 devices and, if so, some requests | |
2906 | * might need to be failed | |
16a53ecc | 2907 | */ |
a4456856 | 2908 | if (s.failed > 2 && s.to_read+s.to_write+s.written) |
1fe797e6 | 2909 | handle_failed_stripe(conf, sh, &s, disks, &return_bi); |
a4456856 | 2910 | if (s.failed > 2 && s.syncing) { |
16a53ecc N |
2911 | md_done_sync(conf->mddev, STRIPE_SECTORS,0); |
2912 | clear_bit(STRIPE_SYNCING, &sh->state); | |
a4456856 | 2913 | s.syncing = 0; |
16a53ecc N |
2914 | } |
2915 | ||
2916 | /* | |
2917 | * might be able to return some write requests if the parity blocks | |
2918 | * are safe, or on a failed drive | |
2919 | */ | |
2920 | pdev = &sh->dev[pd_idx]; | |
a4456856 DW |
2921 | r6s.p_failed = (s.failed >= 1 && r6s.failed_num[0] == pd_idx) |
2922 | || (s.failed >= 2 && r6s.failed_num[1] == pd_idx); | |
2923 | qdev = &sh->dev[r6s.qd_idx]; | |
2924 | r6s.q_failed = (s.failed >= 1 && r6s.failed_num[0] == r6s.qd_idx) | |
2925 | || (s.failed >= 2 && r6s.failed_num[1] == r6s.qd_idx); | |
2926 | ||
2927 | if ( s.written && | |
2928 | ( r6s.p_failed || ((test_bit(R5_Insync, &pdev->flags) | |
16a53ecc | 2929 | && !test_bit(R5_LOCKED, &pdev->flags) |
a4456856 DW |
2930 | && test_bit(R5_UPTODATE, &pdev->flags)))) && |
2931 | ( r6s.q_failed || ((test_bit(R5_Insync, &qdev->flags) | |
16a53ecc | 2932 | && !test_bit(R5_LOCKED, &qdev->flags) |
a4456856 | 2933 | && test_bit(R5_UPTODATE, &qdev->flags))))) |
1fe797e6 | 2934 | handle_stripe_clean_event(conf, sh, disks, &return_bi); |
16a53ecc N |
2935 | |
2936 | /* Now we might consider reading some blocks, either to check/generate | |
2937 | * parity, or to satisfy requests | |
2938 | * or to load a block that is being partially written. | |
2939 | */ | |
a4456856 DW |
2940 | if (s.to_read || s.non_overwrite || (s.to_write && s.failed) || |
2941 | (s.syncing && (s.uptodate < disks)) || s.expanding) | |
1fe797e6 | 2942 | handle_stripe_fill6(sh, &s, &r6s, disks); |
16a53ecc N |
2943 | |
2944 | /* now to consider writing and what else, if anything should be read */ | |
a4456856 | 2945 | if (s.to_write) |
1fe797e6 | 2946 | handle_stripe_dirtying6(conf, sh, &s, &r6s, disks); |
16a53ecc N |
2947 | |
2948 | /* maybe we need to check and possibly fix the parity for this stripe | |
a4456856 DW |
2949 | * Any reads will already have been scheduled, so we just see if enough |
2950 | * data is available | |
16a53ecc | 2951 | */ |
a4456856 DW |
2952 | if (s.syncing && s.locked == 0 && !test_bit(STRIPE_INSYNC, &sh->state)) |
2953 | handle_parity_checks6(conf, sh, &s, &r6s, tmp_page, disks); | |
16a53ecc | 2954 | |
a4456856 | 2955 | if (s.syncing && s.locked == 0 && test_bit(STRIPE_INSYNC, &sh->state)) { |
16a53ecc N |
2956 | md_done_sync(conf->mddev, STRIPE_SECTORS,1); |
2957 | clear_bit(STRIPE_SYNCING, &sh->state); | |
2958 | } | |
2959 | ||
2960 | /* If the failed drives are just a ReadError, then we might need | |
2961 | * to progress the repair/check process | |
2962 | */ | |
a4456856 DW |
2963 | if (s.failed <= 2 && !conf->mddev->ro) |
2964 | for (i = 0; i < s.failed; i++) { | |
2965 | dev = &sh->dev[r6s.failed_num[i]]; | |
16a53ecc N |
2966 | if (test_bit(R5_ReadError, &dev->flags) |
2967 | && !test_bit(R5_LOCKED, &dev->flags) | |
2968 | && test_bit(R5_UPTODATE, &dev->flags) | |
2969 | ) { | |
2970 | if (!test_bit(R5_ReWrite, &dev->flags)) { | |
2971 | set_bit(R5_Wantwrite, &dev->flags); | |
2972 | set_bit(R5_ReWrite, &dev->flags); | |
2973 | set_bit(R5_LOCKED, &dev->flags); | |
2974 | } else { | |
2975 | /* let's read it back */ | |
2976 | set_bit(R5_Wantread, &dev->flags); | |
2977 | set_bit(R5_LOCKED, &dev->flags); | |
2978 | } | |
2979 | } | |
2980 | } | |
f416885e | 2981 | |
a4456856 | 2982 | if (s.expanded && test_bit(STRIPE_EXPANDING, &sh->state)) { |
f416885e N |
2983 | /* Need to write out all blocks after computing P&Q */ |
2984 | sh->disks = conf->raid_disks; | |
2985 | sh->pd_idx = stripe_to_pdidx(sh->sector, conf, | |
2986 | conf->raid_disks); | |
2987 | compute_parity6(sh, RECONSTRUCT_WRITE); | |
2988 | for (i = conf->raid_disks ; i-- ; ) { | |
2989 | set_bit(R5_LOCKED, &sh->dev[i].flags); | |
a4456856 | 2990 | s.locked++; |
f416885e N |
2991 | set_bit(R5_Wantwrite, &sh->dev[i].flags); |
2992 | } | |
2993 | clear_bit(STRIPE_EXPANDING, &sh->state); | |
a4456856 | 2994 | } else if (s.expanded) { |
f416885e N |
2995 | clear_bit(STRIPE_EXPAND_READY, &sh->state); |
2996 | atomic_dec(&conf->reshape_stripes); | |
2997 | wake_up(&conf->wait_for_overlap); | |
2998 | md_done_sync(conf->mddev, STRIPE_SECTORS, 1); | |
2999 | } | |
3000 | ||
0f94e87c | 3001 | if (s.expanding && s.locked == 0 && |
976ea8d4 | 3002 | !test_bit(STRIPE_COMPUTE_RUN, &sh->state)) |
a4456856 | 3003 | handle_stripe_expansion(conf, sh, &r6s); |
f416885e | 3004 | |
6bfe0b49 | 3005 | unlock: |
16a53ecc N |
3006 | spin_unlock(&sh->lock); |
3007 | ||
6bfe0b49 DW |
3008 | /* wait for this device to become unblocked */ |
3009 | if (unlikely(blocked_rdev)) | |
3010 | md_wait_for_blocked_rdev(blocked_rdev, conf->mddev); | |
3011 | ||
f0e43bcd | 3012 | ops_run_io(sh, &s); |
16a53ecc | 3013 | |
f0e43bcd | 3014 | return_io(return_bi); |
df10cfbc DW |
3015 | |
3016 | return blocked_rdev == NULL; | |
16a53ecc N |
3017 | } |
3018 | ||
df10cfbc DW |
3019 | /* returns true if the stripe was handled */ |
3020 | static bool handle_stripe(struct stripe_head *sh, struct page *tmp_page) | |
16a53ecc N |
3021 | { |
3022 | if (sh->raid_conf->level == 6) | |
df10cfbc | 3023 | return handle_stripe6(sh, tmp_page); |
16a53ecc | 3024 | else |
df10cfbc | 3025 | return handle_stripe5(sh); |
16a53ecc N |
3026 | } |
3027 | ||
3028 | ||
3029 | ||
3030 | static void raid5_activate_delayed(raid5_conf_t *conf) | |
3031 | { | |
3032 | if (atomic_read(&conf->preread_active_stripes) < IO_THRESHOLD) { | |
3033 | while (!list_empty(&conf->delayed_list)) { | |
3034 | struct list_head *l = conf->delayed_list.next; | |
3035 | struct stripe_head *sh; | |
3036 | sh = list_entry(l, struct stripe_head, lru); | |
3037 | list_del_init(l); | |
3038 | clear_bit(STRIPE_DELAYED, &sh->state); | |
3039 | if (!test_and_set_bit(STRIPE_PREREAD_ACTIVE, &sh->state)) | |
3040 | atomic_inc(&conf->preread_active_stripes); | |
8b3e6cdc | 3041 | list_add_tail(&sh->lru, &conf->hold_list); |
16a53ecc | 3042 | } |
6ed3003c N |
3043 | } else |
3044 | blk_plug_device(conf->mddev->queue); | |
16a53ecc N |
3045 | } |
3046 | ||
3047 | static void activate_bit_delay(raid5_conf_t *conf) | |
3048 | { | |
3049 | /* device_lock is held */ | |
3050 | struct list_head head; | |
3051 | list_add(&head, &conf->bitmap_list); | |
3052 | list_del_init(&conf->bitmap_list); | |
3053 | while (!list_empty(&head)) { | |
3054 | struct stripe_head *sh = list_entry(head.next, struct stripe_head, lru); | |
3055 | list_del_init(&sh->lru); | |
3056 | atomic_inc(&sh->count); | |
3057 | __release_stripe(conf, sh); | |
3058 | } | |
3059 | } | |
3060 | ||
3061 | static void unplug_slaves(mddev_t *mddev) | |
3062 | { | |
3063 | raid5_conf_t *conf = mddev_to_conf(mddev); | |
3064 | int i; | |
3065 | ||
3066 | rcu_read_lock(); | |
3067 | for (i=0; i<mddev->raid_disks; i++) { | |
3068 | mdk_rdev_t *rdev = rcu_dereference(conf->disks[i].rdev); | |
3069 | if (rdev && !test_bit(Faulty, &rdev->flags) && atomic_read(&rdev->nr_pending)) { | |
165125e1 | 3070 | struct request_queue *r_queue = bdev_get_queue(rdev->bdev); |
16a53ecc N |
3071 | |
3072 | atomic_inc(&rdev->nr_pending); | |
3073 | rcu_read_unlock(); | |
3074 | ||
2ad8b1ef | 3075 | blk_unplug(r_queue); |
16a53ecc N |
3076 | |
3077 | rdev_dec_pending(rdev, mddev); | |
3078 | rcu_read_lock(); | |
3079 | } | |
3080 | } | |
3081 | rcu_read_unlock(); | |
3082 | } | |
3083 | ||
165125e1 | 3084 | static void raid5_unplug_device(struct request_queue *q) |
16a53ecc N |
3085 | { |
3086 | mddev_t *mddev = q->queuedata; | |
3087 | raid5_conf_t *conf = mddev_to_conf(mddev); | |
3088 | unsigned long flags; | |
3089 | ||
3090 | spin_lock_irqsave(&conf->device_lock, flags); | |
3091 | ||
3092 | if (blk_remove_plug(q)) { | |
3093 | conf->seq_flush++; | |
3094 | raid5_activate_delayed(conf); | |
72626685 | 3095 | } |
1da177e4 LT |
3096 | md_wakeup_thread(mddev->thread); |
3097 | ||
3098 | spin_unlock_irqrestore(&conf->device_lock, flags); | |
3099 | ||
3100 | unplug_slaves(mddev); | |
3101 | } | |
3102 | ||
f022b2fd N |
3103 | static int raid5_congested(void *data, int bits) |
3104 | { | |
3105 | mddev_t *mddev = data; | |
3106 | raid5_conf_t *conf = mddev_to_conf(mddev); | |
3107 | ||
3108 | /* No difference between reads and writes. Just check | |
3109 | * how busy the stripe_cache is | |
3110 | */ | |
3111 | if (conf->inactive_blocked) | |
3112 | return 1; | |
3113 | if (conf->quiesce) | |
3114 | return 1; | |
3115 | if (list_empty_careful(&conf->inactive_list)) | |
3116 | return 1; | |
3117 | ||
3118 | return 0; | |
3119 | } | |
3120 | ||
23032a0e RBJ |
3121 | /* We want read requests to align with chunks where possible, |
3122 | * but write requests don't need to. | |
3123 | */ | |
cc371e66 AK |
3124 | static int raid5_mergeable_bvec(struct request_queue *q, |
3125 | struct bvec_merge_data *bvm, | |
3126 | struct bio_vec *biovec) | |
23032a0e RBJ |
3127 | { |
3128 | mddev_t *mddev = q->queuedata; | |
cc371e66 | 3129 | sector_t sector = bvm->bi_sector + get_start_sect(bvm->bi_bdev); |
23032a0e RBJ |
3130 | int max; |
3131 | unsigned int chunk_sectors = mddev->chunk_size >> 9; | |
cc371e66 | 3132 | unsigned int bio_sectors = bvm->bi_size >> 9; |
23032a0e | 3133 | |
cc371e66 | 3134 | if ((bvm->bi_rw & 1) == WRITE) |
23032a0e RBJ |
3135 | return biovec->bv_len; /* always allow writes to be mergeable */ |
3136 | ||
3137 | max = (chunk_sectors - ((sector & (chunk_sectors - 1)) + bio_sectors)) << 9; | |
3138 | if (max < 0) max = 0; | |
3139 | if (max <= biovec->bv_len && bio_sectors == 0) | |
3140 | return biovec->bv_len; | |
3141 | else | |
3142 | return max; | |
3143 | } | |
3144 | ||
f679623f RBJ |
3145 | |
3146 | static int in_chunk_boundary(mddev_t *mddev, struct bio *bio) | |
3147 | { | |
3148 | sector_t sector = bio->bi_sector + get_start_sect(bio->bi_bdev); | |
3149 | unsigned int chunk_sectors = mddev->chunk_size >> 9; | |
3150 | unsigned int bio_sectors = bio->bi_size >> 9; | |
3151 | ||
3152 | return chunk_sectors >= | |
3153 | ((sector & (chunk_sectors - 1)) + bio_sectors); | |
3154 | } | |
3155 | ||
46031f9a RBJ |
3156 | /* |
3157 | * add bio to the retry LIFO ( in O(1) ... we are in interrupt ) | |
3158 | * later sampled by raid5d. | |
3159 | */ | |
3160 | static void add_bio_to_retry(struct bio *bi,raid5_conf_t *conf) | |
3161 | { | |
3162 | unsigned long flags; | |
3163 | ||
3164 | spin_lock_irqsave(&conf->device_lock, flags); | |
3165 | ||
3166 | bi->bi_next = conf->retry_read_aligned_list; | |
3167 | conf->retry_read_aligned_list = bi; | |
3168 | ||
3169 | spin_unlock_irqrestore(&conf->device_lock, flags); | |
3170 | md_wakeup_thread(conf->mddev->thread); | |
3171 | } | |
3172 | ||
3173 | ||
3174 | static struct bio *remove_bio_from_retry(raid5_conf_t *conf) | |
3175 | { | |
3176 | struct bio *bi; | |
3177 | ||
3178 | bi = conf->retry_read_aligned; | |
3179 | if (bi) { | |
3180 | conf->retry_read_aligned = NULL; | |
3181 | return bi; | |
3182 | } | |
3183 | bi = conf->retry_read_aligned_list; | |
3184 | if(bi) { | |
387bb173 | 3185 | conf->retry_read_aligned_list = bi->bi_next; |
46031f9a | 3186 | bi->bi_next = NULL; |
960e739d JA |
3187 | /* |
3188 | * this sets the active strip count to 1 and the processed | |
3189 | * strip count to zero (upper 8 bits) | |
3190 | */ | |
46031f9a | 3191 | bi->bi_phys_segments = 1; /* biased count of active stripes */ |
46031f9a RBJ |
3192 | } |
3193 | ||
3194 | return bi; | |
3195 | } | |
3196 | ||
3197 | ||
f679623f RBJ |
3198 | /* |
3199 | * The "raid5_align_endio" should check if the read succeeded and if it | |
3200 | * did, call bio_endio on the original bio (having bio_put the new bio | |
3201 | * first). | |
3202 | * If the read failed.. | |
3203 | */ | |
6712ecf8 | 3204 | static void raid5_align_endio(struct bio *bi, int error) |
f679623f RBJ |
3205 | { |
3206 | struct bio* raid_bi = bi->bi_private; | |
46031f9a RBJ |
3207 | mddev_t *mddev; |
3208 | raid5_conf_t *conf; | |
3209 | int uptodate = test_bit(BIO_UPTODATE, &bi->bi_flags); | |
3210 | mdk_rdev_t *rdev; | |
3211 | ||
f679623f | 3212 | bio_put(bi); |
46031f9a RBJ |
3213 | |
3214 | mddev = raid_bi->bi_bdev->bd_disk->queue->queuedata; | |
3215 | conf = mddev_to_conf(mddev); | |
3216 | rdev = (void*)raid_bi->bi_next; | |
3217 | raid_bi->bi_next = NULL; | |
3218 | ||
3219 | rdev_dec_pending(rdev, conf->mddev); | |
3220 | ||
3221 | if (!error && uptodate) { | |
6712ecf8 | 3222 | bio_endio(raid_bi, 0); |
46031f9a RBJ |
3223 | if (atomic_dec_and_test(&conf->active_aligned_reads)) |
3224 | wake_up(&conf->wait_for_stripe); | |
6712ecf8 | 3225 | return; |
46031f9a RBJ |
3226 | } |
3227 | ||
3228 | ||
45b4233c | 3229 | pr_debug("raid5_align_endio : io error...handing IO for a retry\n"); |
46031f9a RBJ |
3230 | |
3231 | add_bio_to_retry(raid_bi, conf); | |
f679623f RBJ |
3232 | } |
3233 | ||
387bb173 NB |
3234 | static int bio_fits_rdev(struct bio *bi) |
3235 | { | |
165125e1 | 3236 | struct request_queue *q = bdev_get_queue(bi->bi_bdev); |
387bb173 NB |
3237 | |
3238 | if ((bi->bi_size>>9) > q->max_sectors) | |
3239 | return 0; | |
3240 | blk_recount_segments(q, bi); | |
960e739d | 3241 | if (bi->bi_phys_segments > q->max_phys_segments) |
387bb173 NB |
3242 | return 0; |
3243 | ||
3244 | if (q->merge_bvec_fn) | |
3245 | /* it's too hard to apply the merge_bvec_fn at this stage, | |
3246 | * just just give up | |
3247 | */ | |
3248 | return 0; | |
3249 | ||
3250 | return 1; | |
3251 | } | |
3252 | ||
3253 | ||
165125e1 | 3254 | static int chunk_aligned_read(struct request_queue *q, struct bio * raid_bio) |
f679623f RBJ |
3255 | { |
3256 | mddev_t *mddev = q->queuedata; | |
3257 | raid5_conf_t *conf = mddev_to_conf(mddev); | |
3258 | const unsigned int raid_disks = conf->raid_disks; | |
46031f9a | 3259 | const unsigned int data_disks = raid_disks - conf->max_degraded; |
f679623f RBJ |
3260 | unsigned int dd_idx, pd_idx; |
3261 | struct bio* align_bi; | |
3262 | mdk_rdev_t *rdev; | |
3263 | ||
3264 | if (!in_chunk_boundary(mddev, raid_bio)) { | |
45b4233c | 3265 | pr_debug("chunk_aligned_read : non aligned\n"); |
f679623f RBJ |
3266 | return 0; |
3267 | } | |
3268 | /* | |
3269 | * use bio_clone to make a copy of the bio | |
3270 | */ | |
3271 | align_bi = bio_clone(raid_bio, GFP_NOIO); | |
3272 | if (!align_bi) | |
3273 | return 0; | |
3274 | /* | |
3275 | * set bi_end_io to a new function, and set bi_private to the | |
3276 | * original bio. | |
3277 | */ | |
3278 | align_bi->bi_end_io = raid5_align_endio; | |
3279 | align_bi->bi_private = raid_bio; | |
3280 | /* | |
3281 | * compute position | |
3282 | */ | |
3283 | align_bi->bi_sector = raid5_compute_sector(raid_bio->bi_sector, | |
3284 | raid_disks, | |
3285 | data_disks, | |
3286 | &dd_idx, | |
3287 | &pd_idx, | |
3288 | conf); | |
3289 | ||
3290 | rcu_read_lock(); | |
3291 | rdev = rcu_dereference(conf->disks[dd_idx].rdev); | |
3292 | if (rdev && test_bit(In_sync, &rdev->flags)) { | |
f679623f RBJ |
3293 | atomic_inc(&rdev->nr_pending); |
3294 | rcu_read_unlock(); | |
46031f9a RBJ |
3295 | raid_bio->bi_next = (void*)rdev; |
3296 | align_bi->bi_bdev = rdev->bdev; | |
3297 | align_bi->bi_flags &= ~(1 << BIO_SEG_VALID); | |
3298 | align_bi->bi_sector += rdev->data_offset; | |
3299 | ||
387bb173 NB |
3300 | if (!bio_fits_rdev(align_bi)) { |
3301 | /* too big in some way */ | |
3302 | bio_put(align_bi); | |
3303 | rdev_dec_pending(rdev, mddev); | |
3304 | return 0; | |
3305 | } | |
3306 | ||
46031f9a RBJ |
3307 | spin_lock_irq(&conf->device_lock); |
3308 | wait_event_lock_irq(conf->wait_for_stripe, | |
3309 | conf->quiesce == 0, | |
3310 | conf->device_lock, /* nothing */); | |
3311 | atomic_inc(&conf->active_aligned_reads); | |
3312 | spin_unlock_irq(&conf->device_lock); | |
3313 | ||
f679623f RBJ |
3314 | generic_make_request(align_bi); |
3315 | return 1; | |
3316 | } else { | |
3317 | rcu_read_unlock(); | |
46031f9a | 3318 | bio_put(align_bi); |
f679623f RBJ |
3319 | return 0; |
3320 | } | |
3321 | } | |
3322 | ||
8b3e6cdc DW |
3323 | /* __get_priority_stripe - get the next stripe to process |
3324 | * | |
3325 | * Full stripe writes are allowed to pass preread active stripes up until | |
3326 | * the bypass_threshold is exceeded. In general the bypass_count | |
3327 | * increments when the handle_list is handled before the hold_list; however, it | |
3328 | * will not be incremented when STRIPE_IO_STARTED is sampled set signifying a | |
3329 | * stripe with in flight i/o. The bypass_count will be reset when the | |
3330 | * head of the hold_list has changed, i.e. the head was promoted to the | |
3331 | * handle_list. | |
3332 | */ | |
3333 | static struct stripe_head *__get_priority_stripe(raid5_conf_t *conf) | |
3334 | { | |
3335 | struct stripe_head *sh; | |
3336 | ||
3337 | pr_debug("%s: handle: %s hold: %s full_writes: %d bypass_count: %d\n", | |
3338 | __func__, | |
3339 | list_empty(&conf->handle_list) ? "empty" : "busy", | |
3340 | list_empty(&conf->hold_list) ? "empty" : "busy", | |
3341 | atomic_read(&conf->pending_full_writes), conf->bypass_count); | |
3342 | ||
3343 | if (!list_empty(&conf->handle_list)) { | |
3344 | sh = list_entry(conf->handle_list.next, typeof(*sh), lru); | |
3345 | ||
3346 | if (list_empty(&conf->hold_list)) | |
3347 | conf->bypass_count = 0; | |
3348 | else if (!test_bit(STRIPE_IO_STARTED, &sh->state)) { | |
3349 | if (conf->hold_list.next == conf->last_hold) | |
3350 | conf->bypass_count++; | |
3351 | else { | |
3352 | conf->last_hold = conf->hold_list.next; | |
3353 | conf->bypass_count -= conf->bypass_threshold; | |
3354 | if (conf->bypass_count < 0) | |
3355 | conf->bypass_count = 0; | |
3356 | } | |
3357 | } | |
3358 | } else if (!list_empty(&conf->hold_list) && | |
3359 | ((conf->bypass_threshold && | |
3360 | conf->bypass_count > conf->bypass_threshold) || | |
3361 | atomic_read(&conf->pending_full_writes) == 0)) { | |
3362 | sh = list_entry(conf->hold_list.next, | |
3363 | typeof(*sh), lru); | |
3364 | conf->bypass_count -= conf->bypass_threshold; | |
3365 | if (conf->bypass_count < 0) | |
3366 | conf->bypass_count = 0; | |
3367 | } else | |
3368 | return NULL; | |
3369 | ||
3370 | list_del_init(&sh->lru); | |
3371 | atomic_inc(&sh->count); | |
3372 | BUG_ON(atomic_read(&sh->count) != 1); | |
3373 | return sh; | |
3374 | } | |
f679623f | 3375 | |
165125e1 | 3376 | static int make_request(struct request_queue *q, struct bio * bi) |
1da177e4 LT |
3377 | { |
3378 | mddev_t *mddev = q->queuedata; | |
3379 | raid5_conf_t *conf = mddev_to_conf(mddev); | |
1da177e4 LT |
3380 | unsigned int dd_idx, pd_idx; |
3381 | sector_t new_sector; | |
3382 | sector_t logical_sector, last_sector; | |
3383 | struct stripe_head *sh; | |
a362357b | 3384 | const int rw = bio_data_dir(bi); |
c9959059 | 3385 | int cpu, remaining; |
1da177e4 | 3386 | |
e5dcdd80 | 3387 | if (unlikely(bio_barrier(bi))) { |
6712ecf8 | 3388 | bio_endio(bi, -EOPNOTSUPP); |
e5dcdd80 N |
3389 | return 0; |
3390 | } | |
3391 | ||
3d310eb7 | 3392 | md_write_start(mddev, bi); |
06d91a5f | 3393 | |
074a7aca TH |
3394 | cpu = part_stat_lock(); |
3395 | part_stat_inc(cpu, &mddev->gendisk->part0, ios[rw]); | |
3396 | part_stat_add(cpu, &mddev->gendisk->part0, sectors[rw], | |
3397 | bio_sectors(bi)); | |
3398 | part_stat_unlock(); | |
1da177e4 | 3399 | |
802ba064 | 3400 | if (rw == READ && |
52488615 RBJ |
3401 | mddev->reshape_position == MaxSector && |
3402 | chunk_aligned_read(q,bi)) | |
3403 | return 0; | |
3404 | ||
1da177e4 LT |
3405 | logical_sector = bi->bi_sector & ~((sector_t)STRIPE_SECTORS-1); |
3406 | last_sector = bi->bi_sector + (bi->bi_size>>9); | |
3407 | bi->bi_next = NULL; | |
3408 | bi->bi_phys_segments = 1; /* over-loaded to count active stripes */ | |
06d91a5f | 3409 | |
1da177e4 LT |
3410 | for (;logical_sector < last_sector; logical_sector += STRIPE_SECTORS) { |
3411 | DEFINE_WAIT(w); | |
16a53ecc | 3412 | int disks, data_disks; |
b578d55f | 3413 | |
7ecaa1e6 | 3414 | retry: |
b578d55f | 3415 | prepare_to_wait(&conf->wait_for_overlap, &w, TASK_UNINTERRUPTIBLE); |
7ecaa1e6 N |
3416 | if (likely(conf->expand_progress == MaxSector)) |
3417 | disks = conf->raid_disks; | |
3418 | else { | |
df8e7f76 N |
3419 | /* spinlock is needed as expand_progress may be |
3420 | * 64bit on a 32bit platform, and so it might be | |
3421 | * possible to see a half-updated value | |
3422 | * Ofcourse expand_progress could change after | |
3423 | * the lock is dropped, so once we get a reference | |
3424 | * to the stripe that we think it is, we will have | |
3425 | * to check again. | |
3426 | */ | |
7ecaa1e6 N |
3427 | spin_lock_irq(&conf->device_lock); |
3428 | disks = conf->raid_disks; | |
3429 | if (logical_sector >= conf->expand_progress) | |
3430 | disks = conf->previous_raid_disks; | |
b578d55f N |
3431 | else { |
3432 | if (logical_sector >= conf->expand_lo) { | |
3433 | spin_unlock_irq(&conf->device_lock); | |
3434 | schedule(); | |
3435 | goto retry; | |
3436 | } | |
3437 | } | |
7ecaa1e6 N |
3438 | spin_unlock_irq(&conf->device_lock); |
3439 | } | |
16a53ecc N |
3440 | data_disks = disks - conf->max_degraded; |
3441 | ||
3442 | new_sector = raid5_compute_sector(logical_sector, disks, data_disks, | |
7ecaa1e6 | 3443 | &dd_idx, &pd_idx, conf); |
45b4233c | 3444 | pr_debug("raid5: make_request, sector %llu logical %llu\n", |
1da177e4 LT |
3445 | (unsigned long long)new_sector, |
3446 | (unsigned long long)logical_sector); | |
3447 | ||
7ecaa1e6 | 3448 | sh = get_active_stripe(conf, new_sector, disks, pd_idx, (bi->bi_rw&RWA_MASK)); |
1da177e4 | 3449 | if (sh) { |
7ecaa1e6 N |
3450 | if (unlikely(conf->expand_progress != MaxSector)) { |
3451 | /* expansion might have moved on while waiting for a | |
df8e7f76 N |
3452 | * stripe, so we must do the range check again. |
3453 | * Expansion could still move past after this | |
3454 | * test, but as we are holding a reference to | |
3455 | * 'sh', we know that if that happens, | |
3456 | * STRIPE_EXPANDING will get set and the expansion | |
3457 | * won't proceed until we finish with the stripe. | |
7ecaa1e6 N |
3458 | */ |
3459 | int must_retry = 0; | |
3460 | spin_lock_irq(&conf->device_lock); | |
3461 | if (logical_sector < conf->expand_progress && | |
3462 | disks == conf->previous_raid_disks) | |
3463 | /* mismatch, need to try again */ | |
3464 | must_retry = 1; | |
3465 | spin_unlock_irq(&conf->device_lock); | |
3466 | if (must_retry) { | |
3467 | release_stripe(sh); | |
3468 | goto retry; | |
3469 | } | |
3470 | } | |
e464eafd N |
3471 | /* FIXME what if we get a false positive because these |
3472 | * are being updated. | |
3473 | */ | |
3474 | if (logical_sector >= mddev->suspend_lo && | |
3475 | logical_sector < mddev->suspend_hi) { | |
3476 | release_stripe(sh); | |
3477 | schedule(); | |
3478 | goto retry; | |
3479 | } | |
7ecaa1e6 N |
3480 | |
3481 | if (test_bit(STRIPE_EXPANDING, &sh->state) || | |
3482 | !add_stripe_bio(sh, bi, dd_idx, (bi->bi_rw&RW_MASK))) { | |
3483 | /* Stripe is busy expanding or | |
3484 | * add failed due to overlap. Flush everything | |
1da177e4 LT |
3485 | * and wait a while |
3486 | */ | |
3487 | raid5_unplug_device(mddev->queue); | |
3488 | release_stripe(sh); | |
3489 | schedule(); | |
3490 | goto retry; | |
3491 | } | |
3492 | finish_wait(&conf->wait_for_overlap, &w); | |
6ed3003c N |
3493 | set_bit(STRIPE_HANDLE, &sh->state); |
3494 | clear_bit(STRIPE_DELAYED, &sh->state); | |
1da177e4 | 3495 | release_stripe(sh); |
1da177e4 LT |
3496 | } else { |
3497 | /* cannot get stripe for read-ahead, just give-up */ | |
3498 | clear_bit(BIO_UPTODATE, &bi->bi_flags); | |
3499 | finish_wait(&conf->wait_for_overlap, &w); | |
3500 | break; | |
3501 | } | |
3502 | ||
3503 | } | |
3504 | spin_lock_irq(&conf->device_lock); | |
960e739d | 3505 | remaining = raid5_dec_bi_phys_segments(bi); |
f6344757 N |
3506 | spin_unlock_irq(&conf->device_lock); |
3507 | if (remaining == 0) { | |
1da177e4 | 3508 | |
16a53ecc | 3509 | if ( rw == WRITE ) |
1da177e4 | 3510 | md_write_end(mddev); |
6712ecf8 | 3511 | |
0e13fe23 | 3512 | bio_endio(bi, 0); |
1da177e4 | 3513 | } |
1da177e4 LT |
3514 | return 0; |
3515 | } | |
3516 | ||
52c03291 | 3517 | static sector_t reshape_request(mddev_t *mddev, sector_t sector_nr, int *skipped) |
1da177e4 | 3518 | { |
52c03291 N |
3519 | /* reshaping is quite different to recovery/resync so it is |
3520 | * handled quite separately ... here. | |
3521 | * | |
3522 | * On each call to sync_request, we gather one chunk worth of | |
3523 | * destination stripes and flag them as expanding. | |
3524 | * Then we find all the source stripes and request reads. | |
3525 | * As the reads complete, handle_stripe will copy the data | |
3526 | * into the destination stripe and release that stripe. | |
3527 | */ | |
1da177e4 LT |
3528 | raid5_conf_t *conf = (raid5_conf_t *) mddev->private; |
3529 | struct stripe_head *sh; | |
ccfcc3c1 N |
3530 | int pd_idx; |
3531 | sector_t first_sector, last_sector; | |
f416885e N |
3532 | int raid_disks = conf->previous_raid_disks; |
3533 | int data_disks = raid_disks - conf->max_degraded; | |
3534 | int new_data_disks = conf->raid_disks - conf->max_degraded; | |
52c03291 N |
3535 | int i; |
3536 | int dd_idx; | |
3537 | sector_t writepos, safepos, gap; | |
3538 | ||
3539 | if (sector_nr == 0 && | |
3540 | conf->expand_progress != 0) { | |
3541 | /* restarting in the middle, skip the initial sectors */ | |
3542 | sector_nr = conf->expand_progress; | |
f416885e | 3543 | sector_div(sector_nr, new_data_disks); |
52c03291 N |
3544 | *skipped = 1; |
3545 | return sector_nr; | |
3546 | } | |
3547 | ||
3548 | /* we update the metadata when there is more than 3Meg | |
3549 | * in the block range (that is rather arbitrary, should | |
3550 | * probably be time based) or when the data about to be | |
3551 | * copied would over-write the source of the data at | |
3552 | * the front of the range. | |
3553 | * i.e. one new_stripe forward from expand_progress new_maps | |
3554 | * to after where expand_lo old_maps to | |
3555 | */ | |
3556 | writepos = conf->expand_progress + | |
f416885e N |
3557 | conf->chunk_size/512*(new_data_disks); |
3558 | sector_div(writepos, new_data_disks); | |
52c03291 | 3559 | safepos = conf->expand_lo; |
f416885e | 3560 | sector_div(safepos, data_disks); |
52c03291 N |
3561 | gap = conf->expand_progress - conf->expand_lo; |
3562 | ||
3563 | if (writepos >= safepos || | |
f416885e | 3564 | gap > (new_data_disks)*3000*2 /*3Meg*/) { |
52c03291 N |
3565 | /* Cannot proceed until we've updated the superblock... */ |
3566 | wait_event(conf->wait_for_overlap, | |
3567 | atomic_read(&conf->reshape_stripes)==0); | |
3568 | mddev->reshape_position = conf->expand_progress; | |
850b2b42 | 3569 | set_bit(MD_CHANGE_DEVS, &mddev->flags); |
52c03291 | 3570 | md_wakeup_thread(mddev->thread); |
850b2b42 | 3571 | wait_event(mddev->sb_wait, mddev->flags == 0 || |
52c03291 N |
3572 | kthread_should_stop()); |
3573 | spin_lock_irq(&conf->device_lock); | |
3574 | conf->expand_lo = mddev->reshape_position; | |
3575 | spin_unlock_irq(&conf->device_lock); | |
3576 | wake_up(&conf->wait_for_overlap); | |
3577 | } | |
3578 | ||
3579 | for (i=0; i < conf->chunk_size/512; i+= STRIPE_SECTORS) { | |
3580 | int j; | |
3581 | int skipped = 0; | |
3582 | pd_idx = stripe_to_pdidx(sector_nr+i, conf, conf->raid_disks); | |
3583 | sh = get_active_stripe(conf, sector_nr+i, | |
3584 | conf->raid_disks, pd_idx, 0); | |
3585 | set_bit(STRIPE_EXPANDING, &sh->state); | |
3586 | atomic_inc(&conf->reshape_stripes); | |
3587 | /* If any of this stripe is beyond the end of the old | |
3588 | * array, then we need to zero those blocks | |
3589 | */ | |
3590 | for (j=sh->disks; j--;) { | |
3591 | sector_t s; | |
3592 | if (j == sh->pd_idx) | |
3593 | continue; | |
f416885e N |
3594 | if (conf->level == 6 && |
3595 | j == raid6_next_disk(sh->pd_idx, sh->disks)) | |
3596 | continue; | |
52c03291 | 3597 | s = compute_blocknr(sh, j); |
f233ea5c | 3598 | if (s < mddev->array_sectors) { |
52c03291 N |
3599 | skipped = 1; |
3600 | continue; | |
3601 | } | |
3602 | memset(page_address(sh->dev[j].page), 0, STRIPE_SIZE); | |
3603 | set_bit(R5_Expanded, &sh->dev[j].flags); | |
3604 | set_bit(R5_UPTODATE, &sh->dev[j].flags); | |
3605 | } | |
3606 | if (!skipped) { | |
3607 | set_bit(STRIPE_EXPAND_READY, &sh->state); | |
3608 | set_bit(STRIPE_HANDLE, &sh->state); | |
3609 | } | |
3610 | release_stripe(sh); | |
3611 | } | |
3612 | spin_lock_irq(&conf->device_lock); | |
6d3baf2e | 3613 | conf->expand_progress = (sector_nr + i) * new_data_disks; |
52c03291 N |
3614 | spin_unlock_irq(&conf->device_lock); |
3615 | /* Ok, those stripe are ready. We can start scheduling | |
3616 | * reads on the source stripes. | |
3617 | * The source stripes are determined by mapping the first and last | |
3618 | * block on the destination stripes. | |
3619 | */ | |
52c03291 | 3620 | first_sector = |
f416885e | 3621 | raid5_compute_sector(sector_nr*(new_data_disks), |
52c03291 N |
3622 | raid_disks, data_disks, |
3623 | &dd_idx, &pd_idx, conf); | |
3624 | last_sector = | |
3625 | raid5_compute_sector((sector_nr+conf->chunk_size/512) | |
f416885e | 3626 | *(new_data_disks) -1, |
52c03291 N |
3627 | raid_disks, data_disks, |
3628 | &dd_idx, &pd_idx, conf); | |
3629 | if (last_sector >= (mddev->size<<1)) | |
3630 | last_sector = (mddev->size<<1)-1; | |
3631 | while (first_sector <= last_sector) { | |
f416885e N |
3632 | pd_idx = stripe_to_pdidx(first_sector, conf, |
3633 | conf->previous_raid_disks); | |
52c03291 N |
3634 | sh = get_active_stripe(conf, first_sector, |
3635 | conf->previous_raid_disks, pd_idx, 0); | |
3636 | set_bit(STRIPE_EXPAND_SOURCE, &sh->state); | |
3637 | set_bit(STRIPE_HANDLE, &sh->state); | |
3638 | release_stripe(sh); | |
3639 | first_sector += STRIPE_SECTORS; | |
3640 | } | |
c6207277 N |
3641 | /* If this takes us to the resync_max point where we have to pause, |
3642 | * then we need to write out the superblock. | |
3643 | */ | |
3644 | sector_nr += conf->chunk_size>>9; | |
3645 | if (sector_nr >= mddev->resync_max) { | |
3646 | /* Cannot proceed until we've updated the superblock... */ | |
3647 | wait_event(conf->wait_for_overlap, | |
3648 | atomic_read(&conf->reshape_stripes) == 0); | |
3649 | mddev->reshape_position = conf->expand_progress; | |
3650 | set_bit(MD_CHANGE_DEVS, &mddev->flags); | |
3651 | md_wakeup_thread(mddev->thread); | |
3652 | wait_event(mddev->sb_wait, | |
3653 | !test_bit(MD_CHANGE_DEVS, &mddev->flags) | |
3654 | || kthread_should_stop()); | |
3655 | spin_lock_irq(&conf->device_lock); | |
3656 | conf->expand_lo = mddev->reshape_position; | |
3657 | spin_unlock_irq(&conf->device_lock); | |
3658 | wake_up(&conf->wait_for_overlap); | |
3659 | } | |
52c03291 N |
3660 | return conf->chunk_size>>9; |
3661 | } | |
3662 | ||
3663 | /* FIXME go_faster isn't used */ | |
3664 | static inline sector_t sync_request(mddev_t *mddev, sector_t sector_nr, int *skipped, int go_faster) | |
3665 | { | |
3666 | raid5_conf_t *conf = (raid5_conf_t *) mddev->private; | |
3667 | struct stripe_head *sh; | |
3668 | int pd_idx; | |
1da177e4 | 3669 | int raid_disks = conf->raid_disks; |
72626685 N |
3670 | sector_t max_sector = mddev->size << 1; |
3671 | int sync_blocks; | |
16a53ecc N |
3672 | int still_degraded = 0; |
3673 | int i; | |
1da177e4 | 3674 | |
72626685 | 3675 | if (sector_nr >= max_sector) { |
1da177e4 LT |
3676 | /* just being told to finish up .. nothing much to do */ |
3677 | unplug_slaves(mddev); | |
29269553 N |
3678 | if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)) { |
3679 | end_reshape(conf); | |
3680 | return 0; | |
3681 | } | |
72626685 N |
3682 | |
3683 | if (mddev->curr_resync < max_sector) /* aborted */ | |
3684 | bitmap_end_sync(mddev->bitmap, mddev->curr_resync, | |
3685 | &sync_blocks, 1); | |
16a53ecc | 3686 | else /* completed sync */ |
72626685 N |
3687 | conf->fullsync = 0; |
3688 | bitmap_close_sync(mddev->bitmap); | |
3689 | ||
1da177e4 LT |
3690 | return 0; |
3691 | } | |
ccfcc3c1 | 3692 | |
52c03291 N |
3693 | if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)) |
3694 | return reshape_request(mddev, sector_nr, skipped); | |
f6705578 | 3695 | |
c6207277 N |
3696 | /* No need to check resync_max as we never do more than one |
3697 | * stripe, and as resync_max will always be on a chunk boundary, | |
3698 | * if the check in md_do_sync didn't fire, there is no chance | |
3699 | * of overstepping resync_max here | |
3700 | */ | |
3701 | ||
16a53ecc | 3702 | /* if there is too many failed drives and we are trying |
1da177e4 LT |
3703 | * to resync, then assert that we are finished, because there is |
3704 | * nothing we can do. | |
3705 | */ | |
3285edf1 | 3706 | if (mddev->degraded >= conf->max_degraded && |
16a53ecc | 3707 | test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) { |
57afd89f N |
3708 | sector_t rv = (mddev->size << 1) - sector_nr; |
3709 | *skipped = 1; | |
1da177e4 LT |
3710 | return rv; |
3711 | } | |
72626685 | 3712 | if (!bitmap_start_sync(mddev->bitmap, sector_nr, &sync_blocks, 1) && |
3855ad9f | 3713 | !test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery) && |
72626685 N |
3714 | !conf->fullsync && sync_blocks >= STRIPE_SECTORS) { |
3715 | /* we can skip this block, and probably more */ | |
3716 | sync_blocks /= STRIPE_SECTORS; | |
3717 | *skipped = 1; | |
3718 | return sync_blocks * STRIPE_SECTORS; /* keep things rounded to whole stripes */ | |
3719 | } | |
1da177e4 | 3720 | |
b47490c9 N |
3721 | |
3722 | bitmap_cond_end_sync(mddev->bitmap, sector_nr); | |
3723 | ||
ccfcc3c1 | 3724 | pd_idx = stripe_to_pdidx(sector_nr, conf, raid_disks); |
7ecaa1e6 | 3725 | sh = get_active_stripe(conf, sector_nr, raid_disks, pd_idx, 1); |
1da177e4 | 3726 | if (sh == NULL) { |
7ecaa1e6 | 3727 | sh = get_active_stripe(conf, sector_nr, raid_disks, pd_idx, 0); |
1da177e4 | 3728 | /* make sure we don't swamp the stripe cache if someone else |
16a53ecc | 3729 | * is trying to get access |
1da177e4 | 3730 | */ |
66c006a5 | 3731 | schedule_timeout_uninterruptible(1); |
1da177e4 | 3732 | } |
16a53ecc N |
3733 | /* Need to check if array will still be degraded after recovery/resync |
3734 | * We don't need to check the 'failed' flag as when that gets set, | |
3735 | * recovery aborts. | |
3736 | */ | |
3737 | for (i=0; i<mddev->raid_disks; i++) | |
3738 | if (conf->disks[i].rdev == NULL) | |
3739 | still_degraded = 1; | |
3740 | ||
3741 | bitmap_start_sync(mddev->bitmap, sector_nr, &sync_blocks, still_degraded); | |
3742 | ||
3743 | spin_lock(&sh->lock); | |
1da177e4 LT |
3744 | set_bit(STRIPE_SYNCING, &sh->state); |
3745 | clear_bit(STRIPE_INSYNC, &sh->state); | |
3746 | spin_unlock(&sh->lock); | |
3747 | ||
df10cfbc DW |
3748 | /* wait for any blocked device to be handled */ |
3749 | while(unlikely(!handle_stripe(sh, NULL))) | |
3750 | ; | |
1da177e4 LT |
3751 | release_stripe(sh); |
3752 | ||
3753 | return STRIPE_SECTORS; | |
3754 | } | |
3755 | ||
46031f9a RBJ |
3756 | static int retry_aligned_read(raid5_conf_t *conf, struct bio *raid_bio) |
3757 | { | |
3758 | /* We may not be able to submit a whole bio at once as there | |
3759 | * may not be enough stripe_heads available. | |
3760 | * We cannot pre-allocate enough stripe_heads as we may need | |
3761 | * more than exist in the cache (if we allow ever large chunks). | |
3762 | * So we do one stripe head at a time and record in | |
3763 | * ->bi_hw_segments how many have been done. | |
3764 | * | |
3765 | * We *know* that this entire raid_bio is in one chunk, so | |
3766 | * it will be only one 'dd_idx' and only need one call to raid5_compute_sector. | |
3767 | */ | |
3768 | struct stripe_head *sh; | |
3769 | int dd_idx, pd_idx; | |
3770 | sector_t sector, logical_sector, last_sector; | |
3771 | int scnt = 0; | |
3772 | int remaining; | |
3773 | int handled = 0; | |
3774 | ||
3775 | logical_sector = raid_bio->bi_sector & ~((sector_t)STRIPE_SECTORS-1); | |
3776 | sector = raid5_compute_sector( logical_sector, | |
3777 | conf->raid_disks, | |
3778 | conf->raid_disks - conf->max_degraded, | |
3779 | &dd_idx, | |
3780 | &pd_idx, | |
3781 | conf); | |
3782 | last_sector = raid_bio->bi_sector + (raid_bio->bi_size>>9); | |
3783 | ||
3784 | for (; logical_sector < last_sector; | |
387bb173 NB |
3785 | logical_sector += STRIPE_SECTORS, |
3786 | sector += STRIPE_SECTORS, | |
3787 | scnt++) { | |
46031f9a | 3788 | |
960e739d | 3789 | if (scnt < raid5_bi_hw_segments(raid_bio)) |
46031f9a RBJ |
3790 | /* already done this stripe */ |
3791 | continue; | |
3792 | ||
3793 | sh = get_active_stripe(conf, sector, conf->raid_disks, pd_idx, 1); | |
3794 | ||
3795 | if (!sh) { | |
3796 | /* failed to get a stripe - must wait */ | |
960e739d | 3797 | raid5_set_bi_hw_segments(raid_bio, scnt); |
46031f9a RBJ |
3798 | conf->retry_read_aligned = raid_bio; |
3799 | return handled; | |
3800 | } | |
3801 | ||
3802 | set_bit(R5_ReadError, &sh->dev[dd_idx].flags); | |
387bb173 NB |
3803 | if (!add_stripe_bio(sh, raid_bio, dd_idx, 0)) { |
3804 | release_stripe(sh); | |
960e739d | 3805 | raid5_set_bi_hw_segments(raid_bio, scnt); |
387bb173 NB |
3806 | conf->retry_read_aligned = raid_bio; |
3807 | return handled; | |
3808 | } | |
3809 | ||
46031f9a RBJ |
3810 | handle_stripe(sh, NULL); |
3811 | release_stripe(sh); | |
3812 | handled++; | |
3813 | } | |
3814 | spin_lock_irq(&conf->device_lock); | |
960e739d | 3815 | remaining = raid5_dec_bi_phys_segments(raid_bio); |
46031f9a | 3816 | spin_unlock_irq(&conf->device_lock); |
0e13fe23 NB |
3817 | if (remaining == 0) |
3818 | bio_endio(raid_bio, 0); | |
46031f9a RBJ |
3819 | if (atomic_dec_and_test(&conf->active_aligned_reads)) |
3820 | wake_up(&conf->wait_for_stripe); | |
3821 | return handled; | |
3822 | } | |
3823 | ||
3824 | ||
3825 | ||
1da177e4 LT |
3826 | /* |
3827 | * This is our raid5 kernel thread. | |
3828 | * | |
3829 | * We scan the hash table for stripes which can be handled now. | |
3830 | * During the scan, completed stripes are saved for us by the interrupt | |
3831 | * handler, so that they will not have to wait for our next wakeup. | |
3832 | */ | |
6ed3003c | 3833 | static void raid5d(mddev_t *mddev) |
1da177e4 LT |
3834 | { |
3835 | struct stripe_head *sh; | |
3836 | raid5_conf_t *conf = mddev_to_conf(mddev); | |
3837 | int handled; | |
3838 | ||
45b4233c | 3839 | pr_debug("+++ raid5d active\n"); |
1da177e4 LT |
3840 | |
3841 | md_check_recovery(mddev); | |
1da177e4 LT |
3842 | |
3843 | handled = 0; | |
3844 | spin_lock_irq(&conf->device_lock); | |
3845 | while (1) { | |
46031f9a | 3846 | struct bio *bio; |
1da177e4 | 3847 | |
ae3c20cc | 3848 | if (conf->seq_flush != conf->seq_write) { |
72626685 | 3849 | int seq = conf->seq_flush; |
700e432d | 3850 | spin_unlock_irq(&conf->device_lock); |
72626685 | 3851 | bitmap_unplug(mddev->bitmap); |
700e432d | 3852 | spin_lock_irq(&conf->device_lock); |
72626685 N |
3853 | conf->seq_write = seq; |
3854 | activate_bit_delay(conf); | |
3855 | } | |
3856 | ||
46031f9a RBJ |
3857 | while ((bio = remove_bio_from_retry(conf))) { |
3858 | int ok; | |
3859 | spin_unlock_irq(&conf->device_lock); | |
3860 | ok = retry_aligned_read(conf, bio); | |
3861 | spin_lock_irq(&conf->device_lock); | |
3862 | if (!ok) | |
3863 | break; | |
3864 | handled++; | |
3865 | } | |
3866 | ||
8b3e6cdc DW |
3867 | sh = __get_priority_stripe(conf); |
3868 | ||
c9f21aaf | 3869 | if (!sh) |
1da177e4 | 3870 | break; |
1da177e4 LT |
3871 | spin_unlock_irq(&conf->device_lock); |
3872 | ||
3873 | handled++; | |
16a53ecc | 3874 | handle_stripe(sh, conf->spare_page); |
1da177e4 LT |
3875 | release_stripe(sh); |
3876 | ||
3877 | spin_lock_irq(&conf->device_lock); | |
3878 | } | |
45b4233c | 3879 | pr_debug("%d stripes handled\n", handled); |
1da177e4 LT |
3880 | |
3881 | spin_unlock_irq(&conf->device_lock); | |
3882 | ||
c9f21aaf | 3883 | async_tx_issue_pending_all(); |
1da177e4 LT |
3884 | unplug_slaves(mddev); |
3885 | ||
45b4233c | 3886 | pr_debug("--- raid5d inactive\n"); |
1da177e4 LT |
3887 | } |
3888 | ||
3f294f4f | 3889 | static ssize_t |
007583c9 | 3890 | raid5_show_stripe_cache_size(mddev_t *mddev, char *page) |
3f294f4f | 3891 | { |
007583c9 | 3892 | raid5_conf_t *conf = mddev_to_conf(mddev); |
96de1e66 N |
3893 | if (conf) |
3894 | return sprintf(page, "%d\n", conf->max_nr_stripes); | |
3895 | else | |
3896 | return 0; | |
3f294f4f N |
3897 | } |
3898 | ||
3899 | static ssize_t | |
007583c9 | 3900 | raid5_store_stripe_cache_size(mddev_t *mddev, const char *page, size_t len) |
3f294f4f | 3901 | { |
007583c9 | 3902 | raid5_conf_t *conf = mddev_to_conf(mddev); |
4ef197d8 | 3903 | unsigned long new; |
b5470dc5 DW |
3904 | int err; |
3905 | ||
3f294f4f N |
3906 | if (len >= PAGE_SIZE) |
3907 | return -EINVAL; | |
96de1e66 N |
3908 | if (!conf) |
3909 | return -ENODEV; | |
3f294f4f | 3910 | |
4ef197d8 | 3911 | if (strict_strtoul(page, 10, &new)) |
3f294f4f N |
3912 | return -EINVAL; |
3913 | if (new <= 16 || new > 32768) | |
3914 | return -EINVAL; | |
3915 | while (new < conf->max_nr_stripes) { | |
3916 | if (drop_one_stripe(conf)) | |
3917 | conf->max_nr_stripes--; | |
3918 | else | |
3919 | break; | |
3920 | } | |
b5470dc5 DW |
3921 | err = md_allow_write(mddev); |
3922 | if (err) | |
3923 | return err; | |
3f294f4f N |
3924 | while (new > conf->max_nr_stripes) { |
3925 | if (grow_one_stripe(conf)) | |
3926 | conf->max_nr_stripes++; | |
3927 | else break; | |
3928 | } | |
3929 | return len; | |
3930 | } | |
007583c9 | 3931 | |
96de1e66 N |
3932 | static struct md_sysfs_entry |
3933 | raid5_stripecache_size = __ATTR(stripe_cache_size, S_IRUGO | S_IWUSR, | |
3934 | raid5_show_stripe_cache_size, | |
3935 | raid5_store_stripe_cache_size); | |
3f294f4f | 3936 | |
8b3e6cdc DW |
3937 | static ssize_t |
3938 | raid5_show_preread_threshold(mddev_t *mddev, char *page) | |
3939 | { | |
3940 | raid5_conf_t *conf = mddev_to_conf(mddev); | |
3941 | if (conf) | |
3942 | return sprintf(page, "%d\n", conf->bypass_threshold); | |
3943 | else | |
3944 | return 0; | |
3945 | } | |
3946 | ||
3947 | static ssize_t | |
3948 | raid5_store_preread_threshold(mddev_t *mddev, const char *page, size_t len) | |
3949 | { | |
3950 | raid5_conf_t *conf = mddev_to_conf(mddev); | |
4ef197d8 | 3951 | unsigned long new; |
8b3e6cdc DW |
3952 | if (len >= PAGE_SIZE) |
3953 | return -EINVAL; | |
3954 | if (!conf) | |
3955 | return -ENODEV; | |
3956 | ||
4ef197d8 | 3957 | if (strict_strtoul(page, 10, &new)) |
8b3e6cdc | 3958 | return -EINVAL; |
4ef197d8 | 3959 | if (new > conf->max_nr_stripes) |
8b3e6cdc DW |
3960 | return -EINVAL; |
3961 | conf->bypass_threshold = new; | |
3962 | return len; | |
3963 | } | |
3964 | ||
3965 | static struct md_sysfs_entry | |
3966 | raid5_preread_bypass_threshold = __ATTR(preread_bypass_threshold, | |
3967 | S_IRUGO | S_IWUSR, | |
3968 | raid5_show_preread_threshold, | |
3969 | raid5_store_preread_threshold); | |
3970 | ||
3f294f4f | 3971 | static ssize_t |
96de1e66 | 3972 | stripe_cache_active_show(mddev_t *mddev, char *page) |
3f294f4f | 3973 | { |
007583c9 | 3974 | raid5_conf_t *conf = mddev_to_conf(mddev); |
96de1e66 N |
3975 | if (conf) |
3976 | return sprintf(page, "%d\n", atomic_read(&conf->active_stripes)); | |
3977 | else | |
3978 | return 0; | |
3f294f4f N |
3979 | } |
3980 | ||
96de1e66 N |
3981 | static struct md_sysfs_entry |
3982 | raid5_stripecache_active = __ATTR_RO(stripe_cache_active); | |
3f294f4f | 3983 | |
007583c9 | 3984 | static struct attribute *raid5_attrs[] = { |
3f294f4f N |
3985 | &raid5_stripecache_size.attr, |
3986 | &raid5_stripecache_active.attr, | |
8b3e6cdc | 3987 | &raid5_preread_bypass_threshold.attr, |
3f294f4f N |
3988 | NULL, |
3989 | }; | |
007583c9 N |
3990 | static struct attribute_group raid5_attrs_group = { |
3991 | .name = NULL, | |
3992 | .attrs = raid5_attrs, | |
3f294f4f N |
3993 | }; |
3994 | ||
72626685 | 3995 | static int run(mddev_t *mddev) |
1da177e4 LT |
3996 | { |
3997 | raid5_conf_t *conf; | |
3998 | int raid_disk, memory; | |
3999 | mdk_rdev_t *rdev; | |
4000 | struct disk_info *disk; | |
4001 | struct list_head *tmp; | |
02c2de8c | 4002 | int working_disks = 0; |
1da177e4 | 4003 | |
16a53ecc N |
4004 | if (mddev->level != 5 && mddev->level != 4 && mddev->level != 6) { |
4005 | printk(KERN_ERR "raid5: %s: raid level not set to 4/5/6 (%d)\n", | |
14f8d26b | 4006 | mdname(mddev), mddev->level); |
1da177e4 LT |
4007 | return -EIO; |
4008 | } | |
4009 | ||
4bbf3771 N |
4010 | if (mddev->chunk_size < PAGE_SIZE) { |
4011 | printk(KERN_ERR "md/raid5: chunk_size must be at least " | |
4012 | "PAGE_SIZE but %d < %ld\n", | |
4013 | mddev->chunk_size, PAGE_SIZE); | |
4014 | return -EINVAL; | |
4015 | } | |
4016 | ||
f6705578 N |
4017 | if (mddev->reshape_position != MaxSector) { |
4018 | /* Check that we can continue the reshape. | |
4019 | * Currently only disks can change, it must | |
4020 | * increase, and we must be past the point where | |
4021 | * a stripe over-writes itself | |
4022 | */ | |
4023 | sector_t here_new, here_old; | |
4024 | int old_disks; | |
f416885e | 4025 | int max_degraded = (mddev->level == 5 ? 1 : 2); |
f6705578 N |
4026 | |
4027 | if (mddev->new_level != mddev->level || | |
4028 | mddev->new_layout != mddev->layout || | |
4029 | mddev->new_chunk != mddev->chunk_size) { | |
f416885e N |
4030 | printk(KERN_ERR "raid5: %s: unsupported reshape " |
4031 | "required - aborting.\n", | |
f6705578 N |
4032 | mdname(mddev)); |
4033 | return -EINVAL; | |
4034 | } | |
4035 | if (mddev->delta_disks <= 0) { | |
f416885e N |
4036 | printk(KERN_ERR "raid5: %s: unsupported reshape " |
4037 | "(reduce disks) required - aborting.\n", | |
f6705578 N |
4038 | mdname(mddev)); |
4039 | return -EINVAL; | |
4040 | } | |
4041 | old_disks = mddev->raid_disks - mddev->delta_disks; | |
4042 | /* reshape_position must be on a new-stripe boundary, and one | |
f416885e N |
4043 | * further up in new geometry must map after here in old |
4044 | * geometry. | |
f6705578 N |
4045 | */ |
4046 | here_new = mddev->reshape_position; | |
f416885e N |
4047 | if (sector_div(here_new, (mddev->chunk_size>>9)* |
4048 | (mddev->raid_disks - max_degraded))) { | |
4049 | printk(KERN_ERR "raid5: reshape_position not " | |
4050 | "on a stripe boundary\n"); | |
f6705578 N |
4051 | return -EINVAL; |
4052 | } | |
4053 | /* here_new is the stripe we will write to */ | |
4054 | here_old = mddev->reshape_position; | |
f416885e N |
4055 | sector_div(here_old, (mddev->chunk_size>>9)* |
4056 | (old_disks-max_degraded)); | |
4057 | /* here_old is the first stripe that we might need to read | |
4058 | * from */ | |
f6705578 N |
4059 | if (here_new >= here_old) { |
4060 | /* Reading from the same stripe as writing to - bad */ | |
f416885e N |
4061 | printk(KERN_ERR "raid5: reshape_position too early for " |
4062 | "auto-recovery - aborting.\n"); | |
f6705578 N |
4063 | return -EINVAL; |
4064 | } | |
4065 | printk(KERN_INFO "raid5: reshape will continue\n"); | |
4066 | /* OK, we should be able to continue; */ | |
4067 | } | |
4068 | ||
4069 | ||
b55e6bfc | 4070 | mddev->private = kzalloc(sizeof (raid5_conf_t), GFP_KERNEL); |
1da177e4 LT |
4071 | if ((conf = mddev->private) == NULL) |
4072 | goto abort; | |
f6705578 N |
4073 | if (mddev->reshape_position == MaxSector) { |
4074 | conf->previous_raid_disks = conf->raid_disks = mddev->raid_disks; | |
4075 | } else { | |
4076 | conf->raid_disks = mddev->raid_disks; | |
4077 | conf->previous_raid_disks = mddev->raid_disks - mddev->delta_disks; | |
4078 | } | |
4079 | ||
4080 | conf->disks = kzalloc(conf->raid_disks * sizeof(struct disk_info), | |
b55e6bfc N |
4081 | GFP_KERNEL); |
4082 | if (!conf->disks) | |
4083 | goto abort; | |
9ffae0cf | 4084 | |
1da177e4 LT |
4085 | conf->mddev = mddev; |
4086 | ||
fccddba0 | 4087 | if ((conf->stripe_hashtbl = kzalloc(PAGE_SIZE, GFP_KERNEL)) == NULL) |
1da177e4 | 4088 | goto abort; |
1da177e4 | 4089 | |
16a53ecc N |
4090 | if (mddev->level == 6) { |
4091 | conf->spare_page = alloc_page(GFP_KERNEL); | |
4092 | if (!conf->spare_page) | |
4093 | goto abort; | |
4094 | } | |
1da177e4 | 4095 | spin_lock_init(&conf->device_lock); |
e7e72bf6 | 4096 | mddev->queue->queue_lock = &conf->device_lock; |
1da177e4 LT |
4097 | init_waitqueue_head(&conf->wait_for_stripe); |
4098 | init_waitqueue_head(&conf->wait_for_overlap); | |
4099 | INIT_LIST_HEAD(&conf->handle_list); | |
8b3e6cdc | 4100 | INIT_LIST_HEAD(&conf->hold_list); |
1da177e4 | 4101 | INIT_LIST_HEAD(&conf->delayed_list); |
72626685 | 4102 | INIT_LIST_HEAD(&conf->bitmap_list); |
1da177e4 LT |
4103 | INIT_LIST_HEAD(&conf->inactive_list); |
4104 | atomic_set(&conf->active_stripes, 0); | |
4105 | atomic_set(&conf->preread_active_stripes, 0); | |
46031f9a | 4106 | atomic_set(&conf->active_aligned_reads, 0); |
8b3e6cdc | 4107 | conf->bypass_threshold = BYPASS_THRESHOLD; |
1da177e4 | 4108 | |
45b4233c | 4109 | pr_debug("raid5: run(%s) called.\n", mdname(mddev)); |
1da177e4 | 4110 | |
d089c6af | 4111 | rdev_for_each(rdev, tmp, mddev) { |
1da177e4 | 4112 | raid_disk = rdev->raid_disk; |
f6705578 | 4113 | if (raid_disk >= conf->raid_disks |
1da177e4 LT |
4114 | || raid_disk < 0) |
4115 | continue; | |
4116 | disk = conf->disks + raid_disk; | |
4117 | ||
4118 | disk->rdev = rdev; | |
4119 | ||
b2d444d7 | 4120 | if (test_bit(In_sync, &rdev->flags)) { |
1da177e4 LT |
4121 | char b[BDEVNAME_SIZE]; |
4122 | printk(KERN_INFO "raid5: device %s operational as raid" | |
4123 | " disk %d\n", bdevname(rdev->bdev,b), | |
4124 | raid_disk); | |
02c2de8c | 4125 | working_disks++; |
8c2e870a NB |
4126 | } else |
4127 | /* Cannot rely on bitmap to complete recovery */ | |
4128 | conf->fullsync = 1; | |
1da177e4 LT |
4129 | } |
4130 | ||
1da177e4 | 4131 | /* |
16a53ecc | 4132 | * 0 for a fully functional array, 1 or 2 for a degraded array. |
1da177e4 | 4133 | */ |
02c2de8c | 4134 | mddev->degraded = conf->raid_disks - working_disks; |
1da177e4 LT |
4135 | conf->mddev = mddev; |
4136 | conf->chunk_size = mddev->chunk_size; | |
4137 | conf->level = mddev->level; | |
16a53ecc N |
4138 | if (conf->level == 6) |
4139 | conf->max_degraded = 2; | |
4140 | else | |
4141 | conf->max_degraded = 1; | |
1da177e4 LT |
4142 | conf->algorithm = mddev->layout; |
4143 | conf->max_nr_stripes = NR_STRIPES; | |
f6705578 | 4144 | conf->expand_progress = mddev->reshape_position; |
1da177e4 LT |
4145 | |
4146 | /* device size must be a multiple of chunk size */ | |
4147 | mddev->size &= ~(mddev->chunk_size/1024 -1); | |
b1581566 | 4148 | mddev->resync_max_sectors = mddev->size << 1; |
1da177e4 | 4149 | |
16a53ecc N |
4150 | if (conf->level == 6 && conf->raid_disks < 4) { |
4151 | printk(KERN_ERR "raid6: not enough configured devices for %s (%d, minimum 4)\n", | |
4152 | mdname(mddev), conf->raid_disks); | |
4153 | goto abort; | |
4154 | } | |
1da177e4 LT |
4155 | if (!conf->chunk_size || conf->chunk_size % 4) { |
4156 | printk(KERN_ERR "raid5: invalid chunk size %d for %s\n", | |
4157 | conf->chunk_size, mdname(mddev)); | |
4158 | goto abort; | |
4159 | } | |
4160 | if (conf->algorithm > ALGORITHM_RIGHT_SYMMETRIC) { | |
4161 | printk(KERN_ERR | |
4162 | "raid5: unsupported parity algorithm %d for %s\n", | |
4163 | conf->algorithm, mdname(mddev)); | |
4164 | goto abort; | |
4165 | } | |
16a53ecc | 4166 | if (mddev->degraded > conf->max_degraded) { |
1da177e4 LT |
4167 | printk(KERN_ERR "raid5: not enough operational devices for %s" |
4168 | " (%d/%d failed)\n", | |
02c2de8c | 4169 | mdname(mddev), mddev->degraded, conf->raid_disks); |
1da177e4 LT |
4170 | goto abort; |
4171 | } | |
4172 | ||
16a53ecc | 4173 | if (mddev->degraded > 0 && |
1da177e4 | 4174 | mddev->recovery_cp != MaxSector) { |
6ff8d8ec N |
4175 | if (mddev->ok_start_degraded) |
4176 | printk(KERN_WARNING | |
4177 | "raid5: starting dirty degraded array: %s" | |
4178 | "- data corruption possible.\n", | |
4179 | mdname(mddev)); | |
4180 | else { | |
4181 | printk(KERN_ERR | |
4182 | "raid5: cannot start dirty degraded array for %s\n", | |
4183 | mdname(mddev)); | |
4184 | goto abort; | |
4185 | } | |
1da177e4 LT |
4186 | } |
4187 | ||
4188 | { | |
4189 | mddev->thread = md_register_thread(raid5d, mddev, "%s_raid5"); | |
4190 | if (!mddev->thread) { | |
4191 | printk(KERN_ERR | |
4192 | "raid5: couldn't allocate thread for %s\n", | |
4193 | mdname(mddev)); | |
4194 | goto abort; | |
4195 | } | |
4196 | } | |
5036805b | 4197 | memory = conf->max_nr_stripes * (sizeof(struct stripe_head) + |
1da177e4 LT |
4198 | conf->raid_disks * ((sizeof(struct bio) + PAGE_SIZE))) / 1024; |
4199 | if (grow_stripes(conf, conf->max_nr_stripes)) { | |
4200 | printk(KERN_ERR | |
4201 | "raid5: couldn't allocate %dkB for buffers\n", memory); | |
4202 | shrink_stripes(conf); | |
4203 | md_unregister_thread(mddev->thread); | |
4204 | goto abort; | |
4205 | } else | |
4206 | printk(KERN_INFO "raid5: allocated %dkB for %s\n", | |
4207 | memory, mdname(mddev)); | |
4208 | ||
4209 | if (mddev->degraded == 0) | |
4210 | printk("raid5: raid level %d set %s active with %d out of %d" | |
4211 | " devices, algorithm %d\n", conf->level, mdname(mddev), | |
4212 | mddev->raid_disks-mddev->degraded, mddev->raid_disks, | |
4213 | conf->algorithm); | |
4214 | else | |
4215 | printk(KERN_ALERT "raid5: raid level %d set %s active with %d" | |
4216 | " out of %d devices, algorithm %d\n", conf->level, | |
4217 | mdname(mddev), mddev->raid_disks - mddev->degraded, | |
4218 | mddev->raid_disks, conf->algorithm); | |
4219 | ||
4220 | print_raid5_conf(conf); | |
4221 | ||
f6705578 N |
4222 | if (conf->expand_progress != MaxSector) { |
4223 | printk("...ok start reshape thread\n"); | |
b578d55f | 4224 | conf->expand_lo = conf->expand_progress; |
f6705578 N |
4225 | atomic_set(&conf->reshape_stripes, 0); |
4226 | clear_bit(MD_RECOVERY_SYNC, &mddev->recovery); | |
4227 | clear_bit(MD_RECOVERY_CHECK, &mddev->recovery); | |
4228 | set_bit(MD_RECOVERY_RESHAPE, &mddev->recovery); | |
4229 | set_bit(MD_RECOVERY_RUNNING, &mddev->recovery); | |
4230 | mddev->sync_thread = md_register_thread(md_do_sync, mddev, | |
4231 | "%s_reshape"); | |
f6705578 N |
4232 | } |
4233 | ||
1da177e4 | 4234 | /* read-ahead size must cover two whole stripes, which is |
16a53ecc | 4235 | * 2 * (datadisks) * chunksize where 'n' is the number of raid devices |
1da177e4 LT |
4236 | */ |
4237 | { | |
16a53ecc N |
4238 | int data_disks = conf->previous_raid_disks - conf->max_degraded; |
4239 | int stripe = data_disks * | |
8932c2e0 | 4240 | (mddev->chunk_size / PAGE_SIZE); |
1da177e4 LT |
4241 | if (mddev->queue->backing_dev_info.ra_pages < 2 * stripe) |
4242 | mddev->queue->backing_dev_info.ra_pages = 2 * stripe; | |
4243 | } | |
4244 | ||
4245 | /* Ok, everything is just fine now */ | |
5e55e2f5 N |
4246 | if (sysfs_create_group(&mddev->kobj, &raid5_attrs_group)) |
4247 | printk(KERN_WARNING | |
4248 | "raid5: failed to create sysfs attributes for %s\n", | |
4249 | mdname(mddev)); | |
7a5febe9 N |
4250 | |
4251 | mddev->queue->unplug_fn = raid5_unplug_device; | |
f022b2fd | 4252 | mddev->queue->backing_dev_info.congested_data = mddev; |
041ae52e | 4253 | mddev->queue->backing_dev_info.congested_fn = raid5_congested; |
f022b2fd | 4254 | |
f233ea5c | 4255 | mddev->array_sectors = 2 * mddev->size * (conf->previous_raid_disks - |
16a53ecc | 4256 | conf->max_degraded); |
7a5febe9 | 4257 | |
23032a0e RBJ |
4258 | blk_queue_merge_bvec(mddev->queue, raid5_mergeable_bvec); |
4259 | ||
1da177e4 LT |
4260 | return 0; |
4261 | abort: | |
4262 | if (conf) { | |
4263 | print_raid5_conf(conf); | |
16a53ecc | 4264 | safe_put_page(conf->spare_page); |
b55e6bfc | 4265 | kfree(conf->disks); |
fccddba0 | 4266 | kfree(conf->stripe_hashtbl); |
1da177e4 LT |
4267 | kfree(conf); |
4268 | } | |
4269 | mddev->private = NULL; | |
4270 | printk(KERN_ALERT "raid5: failed to run raid set %s\n", mdname(mddev)); | |
4271 | return -EIO; | |
4272 | } | |
4273 | ||
4274 | ||
4275 | ||
3f294f4f | 4276 | static int stop(mddev_t *mddev) |
1da177e4 LT |
4277 | { |
4278 | raid5_conf_t *conf = (raid5_conf_t *) mddev->private; | |
4279 | ||
4280 | md_unregister_thread(mddev->thread); | |
4281 | mddev->thread = NULL; | |
4282 | shrink_stripes(conf); | |
fccddba0 | 4283 | kfree(conf->stripe_hashtbl); |
041ae52e | 4284 | mddev->queue->backing_dev_info.congested_fn = NULL; |
1da177e4 | 4285 | blk_sync_queue(mddev->queue); /* the unplug fn references 'conf'*/ |
007583c9 | 4286 | sysfs_remove_group(&mddev->kobj, &raid5_attrs_group); |
b55e6bfc | 4287 | kfree(conf->disks); |
96de1e66 | 4288 | kfree(conf); |
1da177e4 LT |
4289 | mddev->private = NULL; |
4290 | return 0; | |
4291 | } | |
4292 | ||
45b4233c | 4293 | #ifdef DEBUG |
d710e138 | 4294 | static void print_sh(struct seq_file *seq, struct stripe_head *sh) |
1da177e4 LT |
4295 | { |
4296 | int i; | |
4297 | ||
16a53ecc N |
4298 | seq_printf(seq, "sh %llu, pd_idx %d, state %ld.\n", |
4299 | (unsigned long long)sh->sector, sh->pd_idx, sh->state); | |
4300 | seq_printf(seq, "sh %llu, count %d.\n", | |
4301 | (unsigned long long)sh->sector, atomic_read(&sh->count)); | |
4302 | seq_printf(seq, "sh %llu, ", (unsigned long long)sh->sector); | |
7ecaa1e6 | 4303 | for (i = 0; i < sh->disks; i++) { |
16a53ecc N |
4304 | seq_printf(seq, "(cache%d: %p %ld) ", |
4305 | i, sh->dev[i].page, sh->dev[i].flags); | |
1da177e4 | 4306 | } |
16a53ecc | 4307 | seq_printf(seq, "\n"); |
1da177e4 LT |
4308 | } |
4309 | ||
d710e138 | 4310 | static void printall(struct seq_file *seq, raid5_conf_t *conf) |
1da177e4 LT |
4311 | { |
4312 | struct stripe_head *sh; | |
fccddba0 | 4313 | struct hlist_node *hn; |
1da177e4 LT |
4314 | int i; |
4315 | ||
4316 | spin_lock_irq(&conf->device_lock); | |
4317 | for (i = 0; i < NR_HASH; i++) { | |
fccddba0 | 4318 | hlist_for_each_entry(sh, hn, &conf->stripe_hashtbl[i], hash) { |
1da177e4 LT |
4319 | if (sh->raid_conf != conf) |
4320 | continue; | |
16a53ecc | 4321 | print_sh(seq, sh); |
1da177e4 LT |
4322 | } |
4323 | } | |
4324 | spin_unlock_irq(&conf->device_lock); | |
4325 | } | |
4326 | #endif | |
4327 | ||
d710e138 | 4328 | static void status(struct seq_file *seq, mddev_t *mddev) |
1da177e4 LT |
4329 | { |
4330 | raid5_conf_t *conf = (raid5_conf_t *) mddev->private; | |
4331 | int i; | |
4332 | ||
4333 | seq_printf (seq, " level %d, %dk chunk, algorithm %d", mddev->level, mddev->chunk_size >> 10, mddev->layout); | |
02c2de8c | 4334 | seq_printf (seq, " [%d/%d] [", conf->raid_disks, conf->raid_disks - mddev->degraded); |
1da177e4 LT |
4335 | for (i = 0; i < conf->raid_disks; i++) |
4336 | seq_printf (seq, "%s", | |
4337 | conf->disks[i].rdev && | |
b2d444d7 | 4338 | test_bit(In_sync, &conf->disks[i].rdev->flags) ? "U" : "_"); |
1da177e4 | 4339 | seq_printf (seq, "]"); |
45b4233c | 4340 | #ifdef DEBUG |
16a53ecc N |
4341 | seq_printf (seq, "\n"); |
4342 | printall(seq, conf); | |
1da177e4 LT |
4343 | #endif |
4344 | } | |
4345 | ||
4346 | static void print_raid5_conf (raid5_conf_t *conf) | |
4347 | { | |
4348 | int i; | |
4349 | struct disk_info *tmp; | |
4350 | ||
4351 | printk("RAID5 conf printout:\n"); | |
4352 | if (!conf) { | |
4353 | printk("(conf==NULL)\n"); | |
4354 | return; | |
4355 | } | |
02c2de8c N |
4356 | printk(" --- rd:%d wd:%d\n", conf->raid_disks, |
4357 | conf->raid_disks - conf->mddev->degraded); | |
1da177e4 LT |
4358 | |
4359 | for (i = 0; i < conf->raid_disks; i++) { | |
4360 | char b[BDEVNAME_SIZE]; | |
4361 | tmp = conf->disks + i; | |
4362 | if (tmp->rdev) | |
4363 | printk(" disk %d, o:%d, dev:%s\n", | |
b2d444d7 | 4364 | i, !test_bit(Faulty, &tmp->rdev->flags), |
1da177e4 LT |
4365 | bdevname(tmp->rdev->bdev,b)); |
4366 | } | |
4367 | } | |
4368 | ||
4369 | static int raid5_spare_active(mddev_t *mddev) | |
4370 | { | |
4371 | int i; | |
4372 | raid5_conf_t *conf = mddev->private; | |
4373 | struct disk_info *tmp; | |
4374 | ||
4375 | for (i = 0; i < conf->raid_disks; i++) { | |
4376 | tmp = conf->disks + i; | |
4377 | if (tmp->rdev | |
b2d444d7 | 4378 | && !test_bit(Faulty, &tmp->rdev->flags) |
c04be0aa N |
4379 | && !test_and_set_bit(In_sync, &tmp->rdev->flags)) { |
4380 | unsigned long flags; | |
4381 | spin_lock_irqsave(&conf->device_lock, flags); | |
1da177e4 | 4382 | mddev->degraded--; |
c04be0aa | 4383 | spin_unlock_irqrestore(&conf->device_lock, flags); |
1da177e4 LT |
4384 | } |
4385 | } | |
4386 | print_raid5_conf(conf); | |
4387 | return 0; | |
4388 | } | |
4389 | ||
4390 | static int raid5_remove_disk(mddev_t *mddev, int number) | |
4391 | { | |
4392 | raid5_conf_t *conf = mddev->private; | |
4393 | int err = 0; | |
4394 | mdk_rdev_t *rdev; | |
4395 | struct disk_info *p = conf->disks + number; | |
4396 | ||
4397 | print_raid5_conf(conf); | |
4398 | rdev = p->rdev; | |
4399 | if (rdev) { | |
b2d444d7 | 4400 | if (test_bit(In_sync, &rdev->flags) || |
1da177e4 LT |
4401 | atomic_read(&rdev->nr_pending)) { |
4402 | err = -EBUSY; | |
4403 | goto abort; | |
4404 | } | |
dfc70645 N |
4405 | /* Only remove non-faulty devices if recovery |
4406 | * isn't possible. | |
4407 | */ | |
4408 | if (!test_bit(Faulty, &rdev->flags) && | |
4409 | mddev->degraded <= conf->max_degraded) { | |
4410 | err = -EBUSY; | |
4411 | goto abort; | |
4412 | } | |
1da177e4 | 4413 | p->rdev = NULL; |
fbd568a3 | 4414 | synchronize_rcu(); |
1da177e4 LT |
4415 | if (atomic_read(&rdev->nr_pending)) { |
4416 | /* lost the race, try later */ | |
4417 | err = -EBUSY; | |
4418 | p->rdev = rdev; | |
4419 | } | |
4420 | } | |
4421 | abort: | |
4422 | ||
4423 | print_raid5_conf(conf); | |
4424 | return err; | |
4425 | } | |
4426 | ||
4427 | static int raid5_add_disk(mddev_t *mddev, mdk_rdev_t *rdev) | |
4428 | { | |
4429 | raid5_conf_t *conf = mddev->private; | |
199050ea | 4430 | int err = -EEXIST; |
1da177e4 LT |
4431 | int disk; |
4432 | struct disk_info *p; | |
6c2fce2e NB |
4433 | int first = 0; |
4434 | int last = conf->raid_disks - 1; | |
1da177e4 | 4435 | |
16a53ecc | 4436 | if (mddev->degraded > conf->max_degraded) |
1da177e4 | 4437 | /* no point adding a device */ |
199050ea | 4438 | return -EINVAL; |
1da177e4 | 4439 | |
6c2fce2e NB |
4440 | if (rdev->raid_disk >= 0) |
4441 | first = last = rdev->raid_disk; | |
1da177e4 LT |
4442 | |
4443 | /* | |
16a53ecc N |
4444 | * find the disk ... but prefer rdev->saved_raid_disk |
4445 | * if possible. | |
1da177e4 | 4446 | */ |
16a53ecc | 4447 | if (rdev->saved_raid_disk >= 0 && |
6c2fce2e | 4448 | rdev->saved_raid_disk >= first && |
16a53ecc N |
4449 | conf->disks[rdev->saved_raid_disk].rdev == NULL) |
4450 | disk = rdev->saved_raid_disk; | |
4451 | else | |
6c2fce2e NB |
4452 | disk = first; |
4453 | for ( ; disk <= last ; disk++) | |
1da177e4 | 4454 | if ((p=conf->disks + disk)->rdev == NULL) { |
b2d444d7 | 4455 | clear_bit(In_sync, &rdev->flags); |
1da177e4 | 4456 | rdev->raid_disk = disk; |
199050ea | 4457 | err = 0; |
72626685 N |
4458 | if (rdev->saved_raid_disk != disk) |
4459 | conf->fullsync = 1; | |
d6065f7b | 4460 | rcu_assign_pointer(p->rdev, rdev); |
1da177e4 LT |
4461 | break; |
4462 | } | |
4463 | print_raid5_conf(conf); | |
199050ea | 4464 | return err; |
1da177e4 LT |
4465 | } |
4466 | ||
4467 | static int raid5_resize(mddev_t *mddev, sector_t sectors) | |
4468 | { | |
4469 | /* no resync is happening, and there is enough space | |
4470 | * on all devices, so we can resize. | |
4471 | * We need to make sure resync covers any new space. | |
4472 | * If the array is shrinking we should possibly wait until | |
4473 | * any io in the removed space completes, but it hardly seems | |
4474 | * worth it. | |
4475 | */ | |
16a53ecc N |
4476 | raid5_conf_t *conf = mddev_to_conf(mddev); |
4477 | ||
1da177e4 | 4478 | sectors &= ~((sector_t)mddev->chunk_size/512 - 1); |
f233ea5c AN |
4479 | mddev->array_sectors = sectors * (mddev->raid_disks |
4480 | - conf->max_degraded); | |
4481 | set_capacity(mddev->gendisk, mddev->array_sectors); | |
44ce6294 | 4482 | mddev->changed = 1; |
1da177e4 LT |
4483 | if (sectors/2 > mddev->size && mddev->recovery_cp == MaxSector) { |
4484 | mddev->recovery_cp = mddev->size << 1; | |
4485 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
4486 | } | |
4487 | mddev->size = sectors /2; | |
4b5c7ae8 | 4488 | mddev->resync_max_sectors = sectors; |
1da177e4 LT |
4489 | return 0; |
4490 | } | |
4491 | ||
29269553 | 4492 | #ifdef CONFIG_MD_RAID5_RESHAPE |
63c70c4f | 4493 | static int raid5_check_reshape(mddev_t *mddev) |
29269553 N |
4494 | { |
4495 | raid5_conf_t *conf = mddev_to_conf(mddev); | |
4496 | int err; | |
29269553 | 4497 | |
63c70c4f N |
4498 | if (mddev->delta_disks < 0 || |
4499 | mddev->new_level != mddev->level) | |
4500 | return -EINVAL; /* Cannot shrink array or change level yet */ | |
4501 | if (mddev->delta_disks == 0) | |
29269553 | 4502 | return 0; /* nothing to do */ |
dba034ee N |
4503 | if (mddev->bitmap) |
4504 | /* Cannot grow a bitmap yet */ | |
4505 | return -EBUSY; | |
29269553 N |
4506 | |
4507 | /* Can only proceed if there are plenty of stripe_heads. | |
4508 | * We need a minimum of one full stripe,, and for sensible progress | |
4509 | * it is best to have about 4 times that. | |
4510 | * If we require 4 times, then the default 256 4K stripe_heads will | |
4511 | * allow for chunk sizes up to 256K, which is probably OK. | |
4512 | * If the chunk size is greater, user-space should request more | |
4513 | * stripe_heads first. | |
4514 | */ | |
63c70c4f N |
4515 | if ((mddev->chunk_size / STRIPE_SIZE) * 4 > conf->max_nr_stripes || |
4516 | (mddev->new_chunk / STRIPE_SIZE) * 4 > conf->max_nr_stripes) { | |
29269553 N |
4517 | printk(KERN_WARNING "raid5: reshape: not enough stripes. Needed %lu\n", |
4518 | (mddev->chunk_size / STRIPE_SIZE)*4); | |
4519 | return -ENOSPC; | |
4520 | } | |
4521 | ||
63c70c4f N |
4522 | err = resize_stripes(conf, conf->raid_disks + mddev->delta_disks); |
4523 | if (err) | |
4524 | return err; | |
4525 | ||
b4c4c7b8 N |
4526 | if (mddev->degraded > conf->max_degraded) |
4527 | return -EINVAL; | |
63c70c4f N |
4528 | /* looks like we might be able to manage this */ |
4529 | return 0; | |
4530 | } | |
4531 | ||
4532 | static int raid5_start_reshape(mddev_t *mddev) | |
4533 | { | |
4534 | raid5_conf_t *conf = mddev_to_conf(mddev); | |
4535 | mdk_rdev_t *rdev; | |
4536 | struct list_head *rtmp; | |
4537 | int spares = 0; | |
4538 | int added_devices = 0; | |
c04be0aa | 4539 | unsigned long flags; |
63c70c4f | 4540 | |
f416885e | 4541 | if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) |
63c70c4f N |
4542 | return -EBUSY; |
4543 | ||
d089c6af | 4544 | rdev_for_each(rdev, rtmp, mddev) |
29269553 N |
4545 | if (rdev->raid_disk < 0 && |
4546 | !test_bit(Faulty, &rdev->flags)) | |
4547 | spares++; | |
63c70c4f | 4548 | |
f416885e | 4549 | if (spares - mddev->degraded < mddev->delta_disks - conf->max_degraded) |
29269553 N |
4550 | /* Not enough devices even to make a degraded array |
4551 | * of that size | |
4552 | */ | |
4553 | return -EINVAL; | |
4554 | ||
f6705578 | 4555 | atomic_set(&conf->reshape_stripes, 0); |
29269553 N |
4556 | spin_lock_irq(&conf->device_lock); |
4557 | conf->previous_raid_disks = conf->raid_disks; | |
63c70c4f | 4558 | conf->raid_disks += mddev->delta_disks; |
29269553 | 4559 | conf->expand_progress = 0; |
b578d55f | 4560 | conf->expand_lo = 0; |
29269553 N |
4561 | spin_unlock_irq(&conf->device_lock); |
4562 | ||
4563 | /* Add some new drives, as many as will fit. | |
4564 | * We know there are enough to make the newly sized array work. | |
4565 | */ | |
d089c6af | 4566 | rdev_for_each(rdev, rtmp, mddev) |
29269553 N |
4567 | if (rdev->raid_disk < 0 && |
4568 | !test_bit(Faulty, &rdev->flags)) { | |
199050ea | 4569 | if (raid5_add_disk(mddev, rdev) == 0) { |
29269553 N |
4570 | char nm[20]; |
4571 | set_bit(In_sync, &rdev->flags); | |
29269553 | 4572 | added_devices++; |
5fd6c1dc | 4573 | rdev->recovery_offset = 0; |
29269553 | 4574 | sprintf(nm, "rd%d", rdev->raid_disk); |
5e55e2f5 N |
4575 | if (sysfs_create_link(&mddev->kobj, |
4576 | &rdev->kobj, nm)) | |
4577 | printk(KERN_WARNING | |
4578 | "raid5: failed to create " | |
4579 | " link %s for %s\n", | |
4580 | nm, mdname(mddev)); | |
29269553 N |
4581 | } else |
4582 | break; | |
4583 | } | |
4584 | ||
c04be0aa | 4585 | spin_lock_irqsave(&conf->device_lock, flags); |
63c70c4f | 4586 | mddev->degraded = (conf->raid_disks - conf->previous_raid_disks) - added_devices; |
c04be0aa | 4587 | spin_unlock_irqrestore(&conf->device_lock, flags); |
63c70c4f | 4588 | mddev->raid_disks = conf->raid_disks; |
f6705578 | 4589 | mddev->reshape_position = 0; |
850b2b42 | 4590 | set_bit(MD_CHANGE_DEVS, &mddev->flags); |
f6705578 | 4591 | |
29269553 N |
4592 | clear_bit(MD_RECOVERY_SYNC, &mddev->recovery); |
4593 | clear_bit(MD_RECOVERY_CHECK, &mddev->recovery); | |
4594 | set_bit(MD_RECOVERY_RESHAPE, &mddev->recovery); | |
4595 | set_bit(MD_RECOVERY_RUNNING, &mddev->recovery); | |
4596 | mddev->sync_thread = md_register_thread(md_do_sync, mddev, | |
4597 | "%s_reshape"); | |
4598 | if (!mddev->sync_thread) { | |
4599 | mddev->recovery = 0; | |
4600 | spin_lock_irq(&conf->device_lock); | |
4601 | mddev->raid_disks = conf->raid_disks = conf->previous_raid_disks; | |
4602 | conf->expand_progress = MaxSector; | |
4603 | spin_unlock_irq(&conf->device_lock); | |
4604 | return -EAGAIN; | |
4605 | } | |
4606 | md_wakeup_thread(mddev->sync_thread); | |
4607 | md_new_event(mddev); | |
4608 | return 0; | |
4609 | } | |
4610 | #endif | |
4611 | ||
4612 | static void end_reshape(raid5_conf_t *conf) | |
4613 | { | |
4614 | struct block_device *bdev; | |
4615 | ||
f6705578 | 4616 | if (!test_bit(MD_RECOVERY_INTR, &conf->mddev->recovery)) { |
f233ea5c | 4617 | conf->mddev->array_sectors = 2 * conf->mddev->size * |
f416885e | 4618 | (conf->raid_disks - conf->max_degraded); |
f233ea5c | 4619 | set_capacity(conf->mddev->gendisk, conf->mddev->array_sectors); |
44ce6294 | 4620 | conf->mddev->changed = 1; |
f6705578 N |
4621 | |
4622 | bdev = bdget_disk(conf->mddev->gendisk, 0); | |
4623 | if (bdev) { | |
4624 | mutex_lock(&bdev->bd_inode->i_mutex); | |
f233ea5c AN |
4625 | i_size_write(bdev->bd_inode, |
4626 | (loff_t)conf->mddev->array_sectors << 9); | |
f6705578 N |
4627 | mutex_unlock(&bdev->bd_inode->i_mutex); |
4628 | bdput(bdev); | |
4629 | } | |
4630 | spin_lock_irq(&conf->device_lock); | |
4631 | conf->expand_progress = MaxSector; | |
4632 | spin_unlock_irq(&conf->device_lock); | |
4633 | conf->mddev->reshape_position = MaxSector; | |
16a53ecc N |
4634 | |
4635 | /* read-ahead size must cover two whole stripes, which is | |
4636 | * 2 * (datadisks) * chunksize where 'n' is the number of raid devices | |
4637 | */ | |
4638 | { | |
4639 | int data_disks = conf->previous_raid_disks - conf->max_degraded; | |
4640 | int stripe = data_disks * | |
4641 | (conf->mddev->chunk_size / PAGE_SIZE); | |
4642 | if (conf->mddev->queue->backing_dev_info.ra_pages < 2 * stripe) | |
4643 | conf->mddev->queue->backing_dev_info.ra_pages = 2 * stripe; | |
4644 | } | |
29269553 | 4645 | } |
29269553 N |
4646 | } |
4647 | ||
72626685 N |
4648 | static void raid5_quiesce(mddev_t *mddev, int state) |
4649 | { | |
4650 | raid5_conf_t *conf = mddev_to_conf(mddev); | |
4651 | ||
4652 | switch(state) { | |
e464eafd N |
4653 | case 2: /* resume for a suspend */ |
4654 | wake_up(&conf->wait_for_overlap); | |
4655 | break; | |
4656 | ||
72626685 N |
4657 | case 1: /* stop all writes */ |
4658 | spin_lock_irq(&conf->device_lock); | |
4659 | conf->quiesce = 1; | |
4660 | wait_event_lock_irq(conf->wait_for_stripe, | |
46031f9a RBJ |
4661 | atomic_read(&conf->active_stripes) == 0 && |
4662 | atomic_read(&conf->active_aligned_reads) == 0, | |
72626685 N |
4663 | conf->device_lock, /* nothing */); |
4664 | spin_unlock_irq(&conf->device_lock); | |
4665 | break; | |
4666 | ||
4667 | case 0: /* re-enable writes */ | |
4668 | spin_lock_irq(&conf->device_lock); | |
4669 | conf->quiesce = 0; | |
4670 | wake_up(&conf->wait_for_stripe); | |
e464eafd | 4671 | wake_up(&conf->wait_for_overlap); |
72626685 N |
4672 | spin_unlock_irq(&conf->device_lock); |
4673 | break; | |
4674 | } | |
72626685 | 4675 | } |
b15c2e57 | 4676 | |
16a53ecc N |
4677 | static struct mdk_personality raid6_personality = |
4678 | { | |
4679 | .name = "raid6", | |
4680 | .level = 6, | |
4681 | .owner = THIS_MODULE, | |
4682 | .make_request = make_request, | |
4683 | .run = run, | |
4684 | .stop = stop, | |
4685 | .status = status, | |
4686 | .error_handler = error, | |
4687 | .hot_add_disk = raid5_add_disk, | |
4688 | .hot_remove_disk= raid5_remove_disk, | |
4689 | .spare_active = raid5_spare_active, | |
4690 | .sync_request = sync_request, | |
4691 | .resize = raid5_resize, | |
f416885e N |
4692 | #ifdef CONFIG_MD_RAID5_RESHAPE |
4693 | .check_reshape = raid5_check_reshape, | |
4694 | .start_reshape = raid5_start_reshape, | |
4695 | #endif | |
16a53ecc N |
4696 | .quiesce = raid5_quiesce, |
4697 | }; | |
2604b703 | 4698 | static struct mdk_personality raid5_personality = |
1da177e4 LT |
4699 | { |
4700 | .name = "raid5", | |
2604b703 | 4701 | .level = 5, |
1da177e4 LT |
4702 | .owner = THIS_MODULE, |
4703 | .make_request = make_request, | |
4704 | .run = run, | |
4705 | .stop = stop, | |
4706 | .status = status, | |
4707 | .error_handler = error, | |
4708 | .hot_add_disk = raid5_add_disk, | |
4709 | .hot_remove_disk= raid5_remove_disk, | |
4710 | .spare_active = raid5_spare_active, | |
4711 | .sync_request = sync_request, | |
4712 | .resize = raid5_resize, | |
29269553 | 4713 | #ifdef CONFIG_MD_RAID5_RESHAPE |
63c70c4f N |
4714 | .check_reshape = raid5_check_reshape, |
4715 | .start_reshape = raid5_start_reshape, | |
29269553 | 4716 | #endif |
72626685 | 4717 | .quiesce = raid5_quiesce, |
1da177e4 LT |
4718 | }; |
4719 | ||
2604b703 | 4720 | static struct mdk_personality raid4_personality = |
1da177e4 | 4721 | { |
2604b703 N |
4722 | .name = "raid4", |
4723 | .level = 4, | |
4724 | .owner = THIS_MODULE, | |
4725 | .make_request = make_request, | |
4726 | .run = run, | |
4727 | .stop = stop, | |
4728 | .status = status, | |
4729 | .error_handler = error, | |
4730 | .hot_add_disk = raid5_add_disk, | |
4731 | .hot_remove_disk= raid5_remove_disk, | |
4732 | .spare_active = raid5_spare_active, | |
4733 | .sync_request = sync_request, | |
4734 | .resize = raid5_resize, | |
3d37890b N |
4735 | #ifdef CONFIG_MD_RAID5_RESHAPE |
4736 | .check_reshape = raid5_check_reshape, | |
4737 | .start_reshape = raid5_start_reshape, | |
4738 | #endif | |
2604b703 N |
4739 | .quiesce = raid5_quiesce, |
4740 | }; | |
4741 | ||
4742 | static int __init raid5_init(void) | |
4743 | { | |
16a53ecc N |
4744 | int e; |
4745 | ||
4746 | e = raid6_select_algo(); | |
4747 | if ( e ) | |
4748 | return e; | |
4749 | register_md_personality(&raid6_personality); | |
2604b703 N |
4750 | register_md_personality(&raid5_personality); |
4751 | register_md_personality(&raid4_personality); | |
4752 | return 0; | |
1da177e4 LT |
4753 | } |
4754 | ||
2604b703 | 4755 | static void raid5_exit(void) |
1da177e4 | 4756 | { |
16a53ecc | 4757 | unregister_md_personality(&raid6_personality); |
2604b703 N |
4758 | unregister_md_personality(&raid5_personality); |
4759 | unregister_md_personality(&raid4_personality); | |
1da177e4 LT |
4760 | } |
4761 | ||
4762 | module_init(raid5_init); | |
4763 | module_exit(raid5_exit); | |
4764 | MODULE_LICENSE("GPL"); | |
4765 | MODULE_ALIAS("md-personality-4"); /* RAID5 */ | |
d9d166c2 N |
4766 | MODULE_ALIAS("md-raid5"); |
4767 | MODULE_ALIAS("md-raid4"); | |
2604b703 N |
4768 | MODULE_ALIAS("md-level-5"); |
4769 | MODULE_ALIAS("md-level-4"); | |
16a53ecc N |
4770 | MODULE_ALIAS("md-personality-8"); /* RAID6 */ |
4771 | MODULE_ALIAS("md-raid6"); | |
4772 | MODULE_ALIAS("md-level-6"); | |
4773 | ||
4774 | /* This used to be two separate modules, they were: */ | |
4775 | MODULE_ALIAS("raid5"); | |
4776 | MODULE_ALIAS("raid6"); |