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 | |
1da177e4 LT |
46 | #include <linux/module.h> |
47 | #include <linux/slab.h> | |
1da177e4 LT |
48 | #include <linux/highmem.h> |
49 | #include <linux/bitops.h> | |
f6705578 | 50 | #include <linux/kthread.h> |
1da177e4 | 51 | #include <asm/atomic.h> |
16a53ecc | 52 | #include "raid6.h" |
1da177e4 | 53 | |
72626685 | 54 | #include <linux/raid/bitmap.h> |
91c00924 | 55 | #include <linux/async_tx.h> |
72626685 | 56 | |
1da177e4 LT |
57 | /* |
58 | * Stripe cache | |
59 | */ | |
60 | ||
61 | #define NR_STRIPES 256 | |
62 | #define STRIPE_SIZE PAGE_SIZE | |
63 | #define STRIPE_SHIFT (PAGE_SHIFT - 9) | |
64 | #define STRIPE_SECTORS (STRIPE_SIZE>>9) | |
65 | #define IO_THRESHOLD 1 | |
8b3e6cdc | 66 | #define BYPASS_THRESHOLD 1 |
fccddba0 | 67 | #define NR_HASH (PAGE_SIZE / sizeof(struct hlist_head)) |
1da177e4 LT |
68 | #define HASH_MASK (NR_HASH - 1) |
69 | ||
fccddba0 | 70 | #define stripe_hash(conf, sect) (&((conf)->stripe_hashtbl[((sect) >> STRIPE_SHIFT) & HASH_MASK])) |
1da177e4 LT |
71 | |
72 | /* bio's attached to a stripe+device for I/O are linked together in bi_sector | |
73 | * order without overlap. There may be several bio's per stripe+device, and | |
74 | * a bio could span several devices. | |
75 | * When walking this list for a particular stripe+device, we must never proceed | |
76 | * beyond a bio that extends past this device, as the next bio might no longer | |
77 | * be valid. | |
78 | * This macro is used to determine the 'next' bio in the list, given the sector | |
79 | * of the current stripe+device | |
80 | */ | |
81 | #define r5_next_bio(bio, sect) ( ( (bio)->bi_sector + ((bio)->bi_size>>9) < sect + STRIPE_SECTORS) ? (bio)->bi_next : NULL) | |
82 | /* | |
83 | * The following can be used to debug the driver | |
84 | */ | |
1da177e4 LT |
85 | #define RAID5_PARANOIA 1 |
86 | #if RAID5_PARANOIA && defined(CONFIG_SMP) | |
87 | # define CHECK_DEVLOCK() assert_spin_locked(&conf->device_lock) | |
88 | #else | |
89 | # define CHECK_DEVLOCK() | |
90 | #endif | |
91 | ||
45b4233c | 92 | #ifdef DEBUG |
1da177e4 LT |
93 | #define inline |
94 | #define __inline__ | |
95 | #endif | |
96 | ||
6be9d494 BS |
97 | #define printk_rl(args...) ((void) (printk_ratelimit() && printk(args))) |
98 | ||
16a53ecc N |
99 | #if !RAID6_USE_EMPTY_ZERO_PAGE |
100 | /* In .bss so it's zeroed */ | |
101 | const char raid6_empty_zero_page[PAGE_SIZE] __attribute__((aligned(256))); | |
102 | #endif | |
103 | ||
960e739d JA |
104 | /* |
105 | * We maintain a biased count of active stripes in the bottom 8 bits of | |
106 | * bi_phys_segments, and a count of processed stripes in the upper 8 bits | |
107 | */ | |
108 | static inline int raid5_bi_phys_segments(struct bio *bio) | |
109 | { | |
110 | return bio->bi_phys_segments & 0xff; | |
111 | } | |
112 | ||
113 | static inline int raid5_bi_hw_segments(struct bio *bio) | |
114 | { | |
115 | return (bio->bi_phys_segments >> 8) & 0xff; | |
116 | } | |
117 | ||
118 | static inline int raid5_dec_bi_phys_segments(struct bio *bio) | |
119 | { | |
120 | --bio->bi_phys_segments; | |
121 | return raid5_bi_phys_segments(bio); | |
122 | } | |
123 | ||
124 | static inline int raid5_dec_bi_hw_segments(struct bio *bio) | |
125 | { | |
126 | unsigned short val = raid5_bi_hw_segments(bio); | |
127 | ||
128 | --val; | |
129 | bio->bi_phys_segments = (val << 8) | raid5_bi_phys_segments(bio); | |
130 | return val; | |
131 | } | |
132 | ||
133 | static inline void raid5_set_bi_hw_segments(struct bio *bio, unsigned int cnt) | |
134 | { | |
135 | bio->bi_phys_segments = raid5_bi_phys_segments(bio) || (cnt << 8); | |
136 | } | |
137 | ||
16a53ecc N |
138 | static inline int raid6_next_disk(int disk, int raid_disks) |
139 | { | |
140 | disk++; | |
141 | return (disk < raid_disks) ? disk : 0; | |
142 | } | |
a4456856 DW |
143 | |
144 | static void return_io(struct bio *return_bi) | |
145 | { | |
146 | struct bio *bi = return_bi; | |
147 | while (bi) { | |
a4456856 DW |
148 | |
149 | return_bi = bi->bi_next; | |
150 | bi->bi_next = NULL; | |
151 | bi->bi_size = 0; | |
0e13fe23 | 152 | bio_endio(bi, 0); |
a4456856 DW |
153 | bi = return_bi; |
154 | } | |
155 | } | |
156 | ||
1da177e4 LT |
157 | static void print_raid5_conf (raid5_conf_t *conf); |
158 | ||
600aa109 DW |
159 | static int stripe_operations_active(struct stripe_head *sh) |
160 | { | |
161 | return sh->check_state || sh->reconstruct_state || | |
162 | test_bit(STRIPE_BIOFILL_RUN, &sh->state) || | |
163 | test_bit(STRIPE_COMPUTE_RUN, &sh->state); | |
164 | } | |
165 | ||
858119e1 | 166 | static void __release_stripe(raid5_conf_t *conf, struct stripe_head *sh) |
1da177e4 LT |
167 | { |
168 | if (atomic_dec_and_test(&sh->count)) { | |
78bafebd ES |
169 | BUG_ON(!list_empty(&sh->lru)); |
170 | BUG_ON(atomic_read(&conf->active_stripes)==0); | |
1da177e4 | 171 | if (test_bit(STRIPE_HANDLE, &sh->state)) { |
7c785b7a | 172 | if (test_bit(STRIPE_DELAYED, &sh->state)) { |
1da177e4 | 173 | list_add_tail(&sh->lru, &conf->delayed_list); |
7c785b7a N |
174 | blk_plug_device(conf->mddev->queue); |
175 | } else if (test_bit(STRIPE_BIT_DELAY, &sh->state) && | |
ae3c20cc | 176 | sh->bm_seq - conf->seq_write > 0) { |
72626685 | 177 | list_add_tail(&sh->lru, &conf->bitmap_list); |
7c785b7a N |
178 | blk_plug_device(conf->mddev->queue); |
179 | } else { | |
72626685 | 180 | clear_bit(STRIPE_BIT_DELAY, &sh->state); |
1da177e4 | 181 | list_add_tail(&sh->lru, &conf->handle_list); |
72626685 | 182 | } |
1da177e4 LT |
183 | md_wakeup_thread(conf->mddev->thread); |
184 | } else { | |
600aa109 | 185 | BUG_ON(stripe_operations_active(sh)); |
1da177e4 LT |
186 | if (test_and_clear_bit(STRIPE_PREREAD_ACTIVE, &sh->state)) { |
187 | atomic_dec(&conf->preread_active_stripes); | |
188 | if (atomic_read(&conf->preread_active_stripes) < IO_THRESHOLD) | |
189 | md_wakeup_thread(conf->mddev->thread); | |
190 | } | |
1da177e4 | 191 | atomic_dec(&conf->active_stripes); |
ccfcc3c1 N |
192 | if (!test_bit(STRIPE_EXPANDING, &sh->state)) { |
193 | list_add_tail(&sh->lru, &conf->inactive_list); | |
1da177e4 | 194 | wake_up(&conf->wait_for_stripe); |
46031f9a RBJ |
195 | if (conf->retry_read_aligned) |
196 | md_wakeup_thread(conf->mddev->thread); | |
ccfcc3c1 | 197 | } |
1da177e4 LT |
198 | } |
199 | } | |
200 | } | |
201 | static void release_stripe(struct stripe_head *sh) | |
202 | { | |
203 | raid5_conf_t *conf = sh->raid_conf; | |
204 | unsigned long flags; | |
16a53ecc | 205 | |
1da177e4 LT |
206 | spin_lock_irqsave(&conf->device_lock, flags); |
207 | __release_stripe(conf, sh); | |
208 | spin_unlock_irqrestore(&conf->device_lock, flags); | |
209 | } | |
210 | ||
fccddba0 | 211 | static inline void remove_hash(struct stripe_head *sh) |
1da177e4 | 212 | { |
45b4233c DW |
213 | pr_debug("remove_hash(), stripe %llu\n", |
214 | (unsigned long long)sh->sector); | |
1da177e4 | 215 | |
fccddba0 | 216 | hlist_del_init(&sh->hash); |
1da177e4 LT |
217 | } |
218 | ||
16a53ecc | 219 | static inline void insert_hash(raid5_conf_t *conf, struct stripe_head *sh) |
1da177e4 | 220 | { |
fccddba0 | 221 | struct hlist_head *hp = stripe_hash(conf, sh->sector); |
1da177e4 | 222 | |
45b4233c DW |
223 | pr_debug("insert_hash(), stripe %llu\n", |
224 | (unsigned long long)sh->sector); | |
1da177e4 LT |
225 | |
226 | CHECK_DEVLOCK(); | |
fccddba0 | 227 | hlist_add_head(&sh->hash, hp); |
1da177e4 LT |
228 | } |
229 | ||
230 | ||
231 | /* find an idle stripe, make sure it is unhashed, and return it. */ | |
232 | static struct stripe_head *get_free_stripe(raid5_conf_t *conf) | |
233 | { | |
234 | struct stripe_head *sh = NULL; | |
235 | struct list_head *first; | |
236 | ||
237 | CHECK_DEVLOCK(); | |
238 | if (list_empty(&conf->inactive_list)) | |
239 | goto out; | |
240 | first = conf->inactive_list.next; | |
241 | sh = list_entry(first, struct stripe_head, lru); | |
242 | list_del_init(first); | |
243 | remove_hash(sh); | |
244 | atomic_inc(&conf->active_stripes); | |
245 | out: | |
246 | return sh; | |
247 | } | |
248 | ||
249 | static void shrink_buffers(struct stripe_head *sh, int num) | |
250 | { | |
251 | struct page *p; | |
252 | int i; | |
253 | ||
254 | for (i=0; i<num ; i++) { | |
255 | p = sh->dev[i].page; | |
256 | if (!p) | |
257 | continue; | |
258 | sh->dev[i].page = NULL; | |
2d1f3b5d | 259 | put_page(p); |
1da177e4 LT |
260 | } |
261 | } | |
262 | ||
263 | static int grow_buffers(struct stripe_head *sh, int num) | |
264 | { | |
265 | int i; | |
266 | ||
267 | for (i=0; i<num; i++) { | |
268 | struct page *page; | |
269 | ||
270 | if (!(page = alloc_page(GFP_KERNEL))) { | |
271 | return 1; | |
272 | } | |
273 | sh->dev[i].page = page; | |
274 | } | |
275 | return 0; | |
276 | } | |
277 | ||
278 | static void raid5_build_block (struct stripe_head *sh, int i); | |
279 | ||
7ecaa1e6 | 280 | static void init_stripe(struct stripe_head *sh, sector_t sector, int pd_idx, int disks) |
1da177e4 LT |
281 | { |
282 | raid5_conf_t *conf = sh->raid_conf; | |
7ecaa1e6 | 283 | int i; |
1da177e4 | 284 | |
78bafebd ES |
285 | BUG_ON(atomic_read(&sh->count) != 0); |
286 | BUG_ON(test_bit(STRIPE_HANDLE, &sh->state)); | |
600aa109 | 287 | BUG_ON(stripe_operations_active(sh)); |
d84e0f10 | 288 | |
1da177e4 | 289 | CHECK_DEVLOCK(); |
45b4233c | 290 | pr_debug("init_stripe called, stripe %llu\n", |
1da177e4 LT |
291 | (unsigned long long)sh->sector); |
292 | ||
293 | remove_hash(sh); | |
16a53ecc | 294 | |
1da177e4 LT |
295 | sh->sector = sector; |
296 | sh->pd_idx = pd_idx; | |
297 | sh->state = 0; | |
298 | ||
7ecaa1e6 N |
299 | sh->disks = disks; |
300 | ||
301 | for (i = sh->disks; i--; ) { | |
1da177e4 LT |
302 | struct r5dev *dev = &sh->dev[i]; |
303 | ||
d84e0f10 | 304 | if (dev->toread || dev->read || dev->towrite || dev->written || |
1da177e4 | 305 | test_bit(R5_LOCKED, &dev->flags)) { |
d84e0f10 | 306 | printk(KERN_ERR "sector=%llx i=%d %p %p %p %p %d\n", |
1da177e4 | 307 | (unsigned long long)sh->sector, i, dev->toread, |
d84e0f10 | 308 | dev->read, dev->towrite, dev->written, |
1da177e4 LT |
309 | test_bit(R5_LOCKED, &dev->flags)); |
310 | BUG(); | |
311 | } | |
312 | dev->flags = 0; | |
313 | raid5_build_block(sh, i); | |
314 | } | |
315 | insert_hash(conf, sh); | |
316 | } | |
317 | ||
7ecaa1e6 | 318 | static struct stripe_head *__find_stripe(raid5_conf_t *conf, sector_t sector, int disks) |
1da177e4 LT |
319 | { |
320 | struct stripe_head *sh; | |
fccddba0 | 321 | struct hlist_node *hn; |
1da177e4 LT |
322 | |
323 | CHECK_DEVLOCK(); | |
45b4233c | 324 | pr_debug("__find_stripe, sector %llu\n", (unsigned long long)sector); |
fccddba0 | 325 | hlist_for_each_entry(sh, hn, stripe_hash(conf, sector), hash) |
7ecaa1e6 | 326 | if (sh->sector == sector && sh->disks == disks) |
1da177e4 | 327 | return sh; |
45b4233c | 328 | pr_debug("__stripe %llu not in cache\n", (unsigned long long)sector); |
1da177e4 LT |
329 | return NULL; |
330 | } | |
331 | ||
332 | static void unplug_slaves(mddev_t *mddev); | |
165125e1 | 333 | static void raid5_unplug_device(struct request_queue *q); |
1da177e4 | 334 | |
7ecaa1e6 N |
335 | static struct stripe_head *get_active_stripe(raid5_conf_t *conf, sector_t sector, int disks, |
336 | int pd_idx, int noblock) | |
1da177e4 LT |
337 | { |
338 | struct stripe_head *sh; | |
339 | ||
45b4233c | 340 | pr_debug("get_stripe, sector %llu\n", (unsigned long long)sector); |
1da177e4 LT |
341 | |
342 | spin_lock_irq(&conf->device_lock); | |
343 | ||
344 | do { | |
72626685 N |
345 | wait_event_lock_irq(conf->wait_for_stripe, |
346 | conf->quiesce == 0, | |
347 | conf->device_lock, /* nothing */); | |
7ecaa1e6 | 348 | sh = __find_stripe(conf, sector, disks); |
1da177e4 LT |
349 | if (!sh) { |
350 | if (!conf->inactive_blocked) | |
351 | sh = get_free_stripe(conf); | |
352 | if (noblock && sh == NULL) | |
353 | break; | |
354 | if (!sh) { | |
355 | conf->inactive_blocked = 1; | |
356 | wait_event_lock_irq(conf->wait_for_stripe, | |
357 | !list_empty(&conf->inactive_list) && | |
5036805b N |
358 | (atomic_read(&conf->active_stripes) |
359 | < (conf->max_nr_stripes *3/4) | |
1da177e4 LT |
360 | || !conf->inactive_blocked), |
361 | conf->device_lock, | |
f4370781 | 362 | raid5_unplug_device(conf->mddev->queue) |
1da177e4 LT |
363 | ); |
364 | conf->inactive_blocked = 0; | |
365 | } else | |
7ecaa1e6 | 366 | init_stripe(sh, sector, pd_idx, disks); |
1da177e4 LT |
367 | } else { |
368 | if (atomic_read(&sh->count)) { | |
78bafebd | 369 | BUG_ON(!list_empty(&sh->lru)); |
1da177e4 LT |
370 | } else { |
371 | if (!test_bit(STRIPE_HANDLE, &sh->state)) | |
372 | atomic_inc(&conf->active_stripes); | |
ff4e8d9a N |
373 | if (list_empty(&sh->lru) && |
374 | !test_bit(STRIPE_EXPANDING, &sh->state)) | |
16a53ecc N |
375 | BUG(); |
376 | list_del_init(&sh->lru); | |
1da177e4 LT |
377 | } |
378 | } | |
379 | } while (sh == NULL); | |
380 | ||
381 | if (sh) | |
382 | atomic_inc(&sh->count); | |
383 | ||
384 | spin_unlock_irq(&conf->device_lock); | |
385 | return sh; | |
386 | } | |
387 | ||
6712ecf8 N |
388 | static void |
389 | raid5_end_read_request(struct bio *bi, int error); | |
390 | static void | |
391 | raid5_end_write_request(struct bio *bi, int error); | |
91c00924 | 392 | |
c4e5ac0a | 393 | static void ops_run_io(struct stripe_head *sh, struct stripe_head_state *s) |
91c00924 DW |
394 | { |
395 | raid5_conf_t *conf = sh->raid_conf; | |
396 | int i, disks = sh->disks; | |
397 | ||
398 | might_sleep(); | |
399 | ||
400 | for (i = disks; i--; ) { | |
401 | int rw; | |
402 | struct bio *bi; | |
403 | mdk_rdev_t *rdev; | |
404 | if (test_and_clear_bit(R5_Wantwrite, &sh->dev[i].flags)) | |
405 | rw = WRITE; | |
406 | else if (test_and_clear_bit(R5_Wantread, &sh->dev[i].flags)) | |
407 | rw = READ; | |
408 | else | |
409 | continue; | |
410 | ||
411 | bi = &sh->dev[i].req; | |
412 | ||
413 | bi->bi_rw = rw; | |
414 | if (rw == WRITE) | |
415 | bi->bi_end_io = raid5_end_write_request; | |
416 | else | |
417 | bi->bi_end_io = raid5_end_read_request; | |
418 | ||
419 | rcu_read_lock(); | |
420 | rdev = rcu_dereference(conf->disks[i].rdev); | |
421 | if (rdev && test_bit(Faulty, &rdev->flags)) | |
422 | rdev = NULL; | |
423 | if (rdev) | |
424 | atomic_inc(&rdev->nr_pending); | |
425 | rcu_read_unlock(); | |
426 | ||
427 | if (rdev) { | |
c4e5ac0a | 428 | if (s->syncing || s->expanding || s->expanded) |
91c00924 DW |
429 | md_sync_acct(rdev->bdev, STRIPE_SECTORS); |
430 | ||
2b7497f0 DW |
431 | set_bit(STRIPE_IO_STARTED, &sh->state); |
432 | ||
91c00924 DW |
433 | bi->bi_bdev = rdev->bdev; |
434 | pr_debug("%s: for %llu schedule op %ld on disc %d\n", | |
e46b272b | 435 | __func__, (unsigned long long)sh->sector, |
91c00924 DW |
436 | bi->bi_rw, i); |
437 | atomic_inc(&sh->count); | |
438 | bi->bi_sector = sh->sector + rdev->data_offset; | |
439 | bi->bi_flags = 1 << BIO_UPTODATE; | |
440 | bi->bi_vcnt = 1; | |
441 | bi->bi_max_vecs = 1; | |
442 | bi->bi_idx = 0; | |
443 | bi->bi_io_vec = &sh->dev[i].vec; | |
444 | bi->bi_io_vec[0].bv_len = STRIPE_SIZE; | |
445 | bi->bi_io_vec[0].bv_offset = 0; | |
446 | bi->bi_size = STRIPE_SIZE; | |
447 | bi->bi_next = NULL; | |
448 | if (rw == WRITE && | |
449 | test_bit(R5_ReWrite, &sh->dev[i].flags)) | |
450 | atomic_add(STRIPE_SECTORS, | |
451 | &rdev->corrected_errors); | |
452 | generic_make_request(bi); | |
453 | } else { | |
454 | if (rw == WRITE) | |
455 | set_bit(STRIPE_DEGRADED, &sh->state); | |
456 | pr_debug("skip op %ld on disc %d for sector %llu\n", | |
457 | bi->bi_rw, i, (unsigned long long)sh->sector); | |
458 | clear_bit(R5_LOCKED, &sh->dev[i].flags); | |
459 | set_bit(STRIPE_HANDLE, &sh->state); | |
460 | } | |
461 | } | |
462 | } | |
463 | ||
464 | static struct dma_async_tx_descriptor * | |
465 | async_copy_data(int frombio, struct bio *bio, struct page *page, | |
466 | sector_t sector, struct dma_async_tx_descriptor *tx) | |
467 | { | |
468 | struct bio_vec *bvl; | |
469 | struct page *bio_page; | |
470 | int i; | |
471 | int page_offset; | |
472 | ||
473 | if (bio->bi_sector >= sector) | |
474 | page_offset = (signed)(bio->bi_sector - sector) * 512; | |
475 | else | |
476 | page_offset = (signed)(sector - bio->bi_sector) * -512; | |
477 | bio_for_each_segment(bvl, bio, i) { | |
478 | int len = bio_iovec_idx(bio, i)->bv_len; | |
479 | int clen; | |
480 | int b_offset = 0; | |
481 | ||
482 | if (page_offset < 0) { | |
483 | b_offset = -page_offset; | |
484 | page_offset += b_offset; | |
485 | len -= b_offset; | |
486 | } | |
487 | ||
488 | if (len > 0 && page_offset + len > STRIPE_SIZE) | |
489 | clen = STRIPE_SIZE - page_offset; | |
490 | else | |
491 | clen = len; | |
492 | ||
493 | if (clen > 0) { | |
494 | b_offset += bio_iovec_idx(bio, i)->bv_offset; | |
495 | bio_page = bio_iovec_idx(bio, i)->bv_page; | |
496 | if (frombio) | |
497 | tx = async_memcpy(page, bio_page, page_offset, | |
498 | b_offset, clen, | |
eb0645a8 | 499 | ASYNC_TX_DEP_ACK, |
91c00924 DW |
500 | tx, NULL, NULL); |
501 | else | |
502 | tx = async_memcpy(bio_page, page, b_offset, | |
503 | page_offset, clen, | |
eb0645a8 | 504 | ASYNC_TX_DEP_ACK, |
91c00924 DW |
505 | tx, NULL, NULL); |
506 | } | |
507 | if (clen < len) /* hit end of page */ | |
508 | break; | |
509 | page_offset += len; | |
510 | } | |
511 | ||
512 | return tx; | |
513 | } | |
514 | ||
515 | static void ops_complete_biofill(void *stripe_head_ref) | |
516 | { | |
517 | struct stripe_head *sh = stripe_head_ref; | |
518 | struct bio *return_bi = NULL; | |
519 | raid5_conf_t *conf = sh->raid_conf; | |
e4d84909 | 520 | int i; |
91c00924 | 521 | |
e46b272b | 522 | pr_debug("%s: stripe %llu\n", __func__, |
91c00924 DW |
523 | (unsigned long long)sh->sector); |
524 | ||
525 | /* clear completed biofills */ | |
83de75cc | 526 | spin_lock_irq(&conf->device_lock); |
91c00924 DW |
527 | for (i = sh->disks; i--; ) { |
528 | struct r5dev *dev = &sh->dev[i]; | |
91c00924 DW |
529 | |
530 | /* acknowledge completion of a biofill operation */ | |
e4d84909 DW |
531 | /* and check if we need to reply to a read request, |
532 | * new R5_Wantfill requests are held off until | |
83de75cc | 533 | * !STRIPE_BIOFILL_RUN |
e4d84909 DW |
534 | */ |
535 | if (test_and_clear_bit(R5_Wantfill, &dev->flags)) { | |
91c00924 | 536 | struct bio *rbi, *rbi2; |
91c00924 | 537 | |
91c00924 DW |
538 | BUG_ON(!dev->read); |
539 | rbi = dev->read; | |
540 | dev->read = NULL; | |
541 | while (rbi && rbi->bi_sector < | |
542 | dev->sector + STRIPE_SECTORS) { | |
543 | rbi2 = r5_next_bio(rbi, dev->sector); | |
960e739d | 544 | if (!raid5_dec_bi_phys_segments(rbi)) { |
91c00924 DW |
545 | rbi->bi_next = return_bi; |
546 | return_bi = rbi; | |
547 | } | |
91c00924 DW |
548 | rbi = rbi2; |
549 | } | |
550 | } | |
551 | } | |
83de75cc DW |
552 | spin_unlock_irq(&conf->device_lock); |
553 | clear_bit(STRIPE_BIOFILL_RUN, &sh->state); | |
91c00924 DW |
554 | |
555 | return_io(return_bi); | |
556 | ||
e4d84909 | 557 | set_bit(STRIPE_HANDLE, &sh->state); |
91c00924 DW |
558 | release_stripe(sh); |
559 | } | |
560 | ||
561 | static void ops_run_biofill(struct stripe_head *sh) | |
562 | { | |
563 | struct dma_async_tx_descriptor *tx = NULL; | |
564 | raid5_conf_t *conf = sh->raid_conf; | |
565 | int i; | |
566 | ||
e46b272b | 567 | pr_debug("%s: stripe %llu\n", __func__, |
91c00924 DW |
568 | (unsigned long long)sh->sector); |
569 | ||
570 | for (i = sh->disks; i--; ) { | |
571 | struct r5dev *dev = &sh->dev[i]; | |
572 | if (test_bit(R5_Wantfill, &dev->flags)) { | |
573 | struct bio *rbi; | |
574 | spin_lock_irq(&conf->device_lock); | |
575 | dev->read = rbi = dev->toread; | |
576 | dev->toread = NULL; | |
577 | spin_unlock_irq(&conf->device_lock); | |
578 | while (rbi && rbi->bi_sector < | |
579 | dev->sector + STRIPE_SECTORS) { | |
580 | tx = async_copy_data(0, rbi, dev->page, | |
581 | dev->sector, tx); | |
582 | rbi = r5_next_bio(rbi, dev->sector); | |
583 | } | |
584 | } | |
585 | } | |
586 | ||
587 | atomic_inc(&sh->count); | |
588 | async_trigger_callback(ASYNC_TX_DEP_ACK | ASYNC_TX_ACK, tx, | |
589 | ops_complete_biofill, sh); | |
590 | } | |
591 | ||
592 | static void ops_complete_compute5(void *stripe_head_ref) | |
593 | { | |
594 | struct stripe_head *sh = stripe_head_ref; | |
595 | int target = sh->ops.target; | |
596 | struct r5dev *tgt = &sh->dev[target]; | |
597 | ||
e46b272b | 598 | pr_debug("%s: stripe %llu\n", __func__, |
91c00924 DW |
599 | (unsigned long long)sh->sector); |
600 | ||
601 | set_bit(R5_UPTODATE, &tgt->flags); | |
602 | BUG_ON(!test_bit(R5_Wantcompute, &tgt->flags)); | |
603 | clear_bit(R5_Wantcompute, &tgt->flags); | |
ecc65c9b DW |
604 | clear_bit(STRIPE_COMPUTE_RUN, &sh->state); |
605 | if (sh->check_state == check_state_compute_run) | |
606 | sh->check_state = check_state_compute_result; | |
91c00924 DW |
607 | set_bit(STRIPE_HANDLE, &sh->state); |
608 | release_stripe(sh); | |
609 | } | |
610 | ||
7b3a871e | 611 | static struct dma_async_tx_descriptor *ops_run_compute5(struct stripe_head *sh) |
91c00924 DW |
612 | { |
613 | /* kernel stack size limits the total number of disks */ | |
614 | int disks = sh->disks; | |
615 | struct page *xor_srcs[disks]; | |
616 | int target = sh->ops.target; | |
617 | struct r5dev *tgt = &sh->dev[target]; | |
618 | struct page *xor_dest = tgt->page; | |
619 | int count = 0; | |
620 | struct dma_async_tx_descriptor *tx; | |
621 | int i; | |
622 | ||
623 | pr_debug("%s: stripe %llu block: %d\n", | |
e46b272b | 624 | __func__, (unsigned long long)sh->sector, target); |
91c00924 DW |
625 | BUG_ON(!test_bit(R5_Wantcompute, &tgt->flags)); |
626 | ||
627 | for (i = disks; i--; ) | |
628 | if (i != target) | |
629 | xor_srcs[count++] = sh->dev[i].page; | |
630 | ||
631 | atomic_inc(&sh->count); | |
632 | ||
633 | if (unlikely(count == 1)) | |
634 | tx = async_memcpy(xor_dest, xor_srcs[0], 0, 0, STRIPE_SIZE, | |
635 | 0, NULL, ops_complete_compute5, sh); | |
636 | else | |
637 | tx = async_xor(xor_dest, xor_srcs, 0, count, STRIPE_SIZE, | |
638 | ASYNC_TX_XOR_ZERO_DST, NULL, | |
639 | ops_complete_compute5, sh); | |
640 | ||
91c00924 DW |
641 | return tx; |
642 | } | |
643 | ||
644 | static void ops_complete_prexor(void *stripe_head_ref) | |
645 | { | |
646 | struct stripe_head *sh = stripe_head_ref; | |
647 | ||
e46b272b | 648 | pr_debug("%s: stripe %llu\n", __func__, |
91c00924 | 649 | (unsigned long long)sh->sector); |
91c00924 DW |
650 | } |
651 | ||
652 | static struct dma_async_tx_descriptor * | |
653 | ops_run_prexor(struct stripe_head *sh, struct dma_async_tx_descriptor *tx) | |
654 | { | |
655 | /* kernel stack size limits the total number of disks */ | |
656 | int disks = sh->disks; | |
657 | struct page *xor_srcs[disks]; | |
658 | int count = 0, pd_idx = sh->pd_idx, i; | |
659 | ||
660 | /* existing parity data subtracted */ | |
661 | struct page *xor_dest = xor_srcs[count++] = sh->dev[pd_idx].page; | |
662 | ||
e46b272b | 663 | pr_debug("%s: stripe %llu\n", __func__, |
91c00924 DW |
664 | (unsigned long long)sh->sector); |
665 | ||
666 | for (i = disks; i--; ) { | |
667 | struct r5dev *dev = &sh->dev[i]; | |
668 | /* Only process blocks that are known to be uptodate */ | |
d8ee0728 | 669 | if (test_bit(R5_Wantdrain, &dev->flags)) |
91c00924 DW |
670 | xor_srcs[count++] = dev->page; |
671 | } | |
672 | ||
673 | tx = async_xor(xor_dest, xor_srcs, 0, count, STRIPE_SIZE, | |
674 | ASYNC_TX_DEP_ACK | ASYNC_TX_XOR_DROP_DST, tx, | |
675 | ops_complete_prexor, sh); | |
676 | ||
677 | return tx; | |
678 | } | |
679 | ||
680 | static struct dma_async_tx_descriptor * | |
d8ee0728 | 681 | ops_run_biodrain(struct stripe_head *sh, struct dma_async_tx_descriptor *tx) |
91c00924 DW |
682 | { |
683 | int disks = sh->disks; | |
d8ee0728 | 684 | int i; |
91c00924 | 685 | |
e46b272b | 686 | pr_debug("%s: stripe %llu\n", __func__, |
91c00924 DW |
687 | (unsigned long long)sh->sector); |
688 | ||
689 | for (i = disks; i--; ) { | |
690 | struct r5dev *dev = &sh->dev[i]; | |
691 | struct bio *chosen; | |
91c00924 | 692 | |
d8ee0728 | 693 | if (test_and_clear_bit(R5_Wantdrain, &dev->flags)) { |
91c00924 DW |
694 | struct bio *wbi; |
695 | ||
696 | spin_lock(&sh->lock); | |
697 | chosen = dev->towrite; | |
698 | dev->towrite = NULL; | |
699 | BUG_ON(dev->written); | |
700 | wbi = dev->written = chosen; | |
701 | spin_unlock(&sh->lock); | |
702 | ||
703 | while (wbi && wbi->bi_sector < | |
704 | dev->sector + STRIPE_SECTORS) { | |
705 | tx = async_copy_data(1, wbi, dev->page, | |
706 | dev->sector, tx); | |
707 | wbi = r5_next_bio(wbi, dev->sector); | |
708 | } | |
709 | } | |
710 | } | |
711 | ||
712 | return tx; | |
713 | } | |
714 | ||
715 | static void ops_complete_postxor(void *stripe_head_ref) | |
91c00924 DW |
716 | { |
717 | struct stripe_head *sh = stripe_head_ref; | |
718 | int disks = sh->disks, i, pd_idx = sh->pd_idx; | |
719 | ||
e46b272b | 720 | pr_debug("%s: stripe %llu\n", __func__, |
91c00924 DW |
721 | (unsigned long long)sh->sector); |
722 | ||
723 | for (i = disks; i--; ) { | |
724 | struct r5dev *dev = &sh->dev[i]; | |
725 | if (dev->written || i == pd_idx) | |
726 | set_bit(R5_UPTODATE, &dev->flags); | |
727 | } | |
728 | ||
d8ee0728 DW |
729 | if (sh->reconstruct_state == reconstruct_state_drain_run) |
730 | sh->reconstruct_state = reconstruct_state_drain_result; | |
731 | else if (sh->reconstruct_state == reconstruct_state_prexor_drain_run) | |
732 | sh->reconstruct_state = reconstruct_state_prexor_drain_result; | |
733 | else { | |
734 | BUG_ON(sh->reconstruct_state != reconstruct_state_run); | |
735 | sh->reconstruct_state = reconstruct_state_result; | |
736 | } | |
91c00924 DW |
737 | |
738 | set_bit(STRIPE_HANDLE, &sh->state); | |
739 | release_stripe(sh); | |
740 | } | |
741 | ||
742 | static void | |
d8ee0728 | 743 | ops_run_postxor(struct stripe_head *sh, struct dma_async_tx_descriptor *tx) |
91c00924 DW |
744 | { |
745 | /* kernel stack size limits the total number of disks */ | |
746 | int disks = sh->disks; | |
747 | struct page *xor_srcs[disks]; | |
748 | ||
749 | int count = 0, pd_idx = sh->pd_idx, i; | |
750 | struct page *xor_dest; | |
d8ee0728 | 751 | int prexor = 0; |
91c00924 | 752 | unsigned long flags; |
91c00924 | 753 | |
e46b272b | 754 | pr_debug("%s: stripe %llu\n", __func__, |
91c00924 DW |
755 | (unsigned long long)sh->sector); |
756 | ||
757 | /* check if prexor is active which means only process blocks | |
758 | * that are part of a read-modify-write (written) | |
759 | */ | |
d8ee0728 DW |
760 | if (sh->reconstruct_state == reconstruct_state_prexor_drain_run) { |
761 | prexor = 1; | |
91c00924 DW |
762 | xor_dest = xor_srcs[count++] = sh->dev[pd_idx].page; |
763 | for (i = disks; i--; ) { | |
764 | struct r5dev *dev = &sh->dev[i]; | |
765 | if (dev->written) | |
766 | xor_srcs[count++] = dev->page; | |
767 | } | |
768 | } else { | |
769 | xor_dest = sh->dev[pd_idx].page; | |
770 | for (i = disks; i--; ) { | |
771 | struct r5dev *dev = &sh->dev[i]; | |
772 | if (i != pd_idx) | |
773 | xor_srcs[count++] = dev->page; | |
774 | } | |
775 | } | |
776 | ||
91c00924 DW |
777 | /* 1/ if we prexor'd then the dest is reused as a source |
778 | * 2/ if we did not prexor then we are redoing the parity | |
779 | * set ASYNC_TX_XOR_DROP_DST and ASYNC_TX_XOR_ZERO_DST | |
780 | * for the synchronous xor case | |
781 | */ | |
782 | flags = ASYNC_TX_DEP_ACK | ASYNC_TX_ACK | | |
783 | (prexor ? ASYNC_TX_XOR_DROP_DST : ASYNC_TX_XOR_ZERO_DST); | |
784 | ||
785 | atomic_inc(&sh->count); | |
786 | ||
787 | if (unlikely(count == 1)) { | |
788 | flags &= ~(ASYNC_TX_XOR_DROP_DST | ASYNC_TX_XOR_ZERO_DST); | |
789 | tx = async_memcpy(xor_dest, xor_srcs[0], 0, 0, STRIPE_SIZE, | |
d8ee0728 | 790 | flags, tx, ops_complete_postxor, sh); |
91c00924 DW |
791 | } else |
792 | tx = async_xor(xor_dest, xor_srcs, 0, count, STRIPE_SIZE, | |
d8ee0728 | 793 | flags, tx, ops_complete_postxor, sh); |
91c00924 DW |
794 | } |
795 | ||
796 | static void ops_complete_check(void *stripe_head_ref) | |
797 | { | |
798 | struct stripe_head *sh = stripe_head_ref; | |
91c00924 | 799 | |
e46b272b | 800 | pr_debug("%s: stripe %llu\n", __func__, |
91c00924 DW |
801 | (unsigned long long)sh->sector); |
802 | ||
ecc65c9b | 803 | sh->check_state = check_state_check_result; |
91c00924 DW |
804 | set_bit(STRIPE_HANDLE, &sh->state); |
805 | release_stripe(sh); | |
806 | } | |
807 | ||
808 | static void ops_run_check(struct stripe_head *sh) | |
809 | { | |
810 | /* kernel stack size limits the total number of disks */ | |
811 | int disks = sh->disks; | |
812 | struct page *xor_srcs[disks]; | |
813 | struct dma_async_tx_descriptor *tx; | |
814 | ||
815 | int count = 0, pd_idx = sh->pd_idx, i; | |
816 | struct page *xor_dest = xor_srcs[count++] = sh->dev[pd_idx].page; | |
817 | ||
e46b272b | 818 | pr_debug("%s: stripe %llu\n", __func__, |
91c00924 DW |
819 | (unsigned long long)sh->sector); |
820 | ||
821 | for (i = disks; i--; ) { | |
822 | struct r5dev *dev = &sh->dev[i]; | |
823 | if (i != pd_idx) | |
824 | xor_srcs[count++] = dev->page; | |
825 | } | |
826 | ||
827 | tx = async_xor_zero_sum(xor_dest, xor_srcs, 0, count, STRIPE_SIZE, | |
828 | &sh->ops.zero_sum_result, 0, NULL, NULL, NULL); | |
829 | ||
91c00924 DW |
830 | atomic_inc(&sh->count); |
831 | tx = async_trigger_callback(ASYNC_TX_DEP_ACK | ASYNC_TX_ACK, tx, | |
832 | ops_complete_check, sh); | |
833 | } | |
834 | ||
600aa109 | 835 | static void raid5_run_ops(struct stripe_head *sh, unsigned long ops_request) |
91c00924 DW |
836 | { |
837 | int overlap_clear = 0, i, disks = sh->disks; | |
838 | struct dma_async_tx_descriptor *tx = NULL; | |
839 | ||
83de75cc | 840 | if (test_bit(STRIPE_OP_BIOFILL, &ops_request)) { |
91c00924 DW |
841 | ops_run_biofill(sh); |
842 | overlap_clear++; | |
843 | } | |
844 | ||
7b3a871e DW |
845 | if (test_bit(STRIPE_OP_COMPUTE_BLK, &ops_request)) { |
846 | tx = ops_run_compute5(sh); | |
847 | /* terminate the chain if postxor is not set to be run */ | |
848 | if (tx && !test_bit(STRIPE_OP_POSTXOR, &ops_request)) | |
849 | async_tx_ack(tx); | |
850 | } | |
91c00924 | 851 | |
600aa109 | 852 | if (test_bit(STRIPE_OP_PREXOR, &ops_request)) |
91c00924 DW |
853 | tx = ops_run_prexor(sh, tx); |
854 | ||
600aa109 | 855 | if (test_bit(STRIPE_OP_BIODRAIN, &ops_request)) { |
d8ee0728 | 856 | tx = ops_run_biodrain(sh, tx); |
91c00924 DW |
857 | overlap_clear++; |
858 | } | |
859 | ||
600aa109 | 860 | if (test_bit(STRIPE_OP_POSTXOR, &ops_request)) |
d8ee0728 | 861 | ops_run_postxor(sh, tx); |
91c00924 | 862 | |
ecc65c9b | 863 | if (test_bit(STRIPE_OP_CHECK, &ops_request)) |
91c00924 DW |
864 | ops_run_check(sh); |
865 | ||
91c00924 DW |
866 | if (overlap_clear) |
867 | for (i = disks; i--; ) { | |
868 | struct r5dev *dev = &sh->dev[i]; | |
869 | if (test_and_clear_bit(R5_Overlap, &dev->flags)) | |
870 | wake_up(&sh->raid_conf->wait_for_overlap); | |
871 | } | |
872 | } | |
873 | ||
3f294f4f | 874 | static int grow_one_stripe(raid5_conf_t *conf) |
1da177e4 LT |
875 | { |
876 | struct stripe_head *sh; | |
3f294f4f N |
877 | sh = kmem_cache_alloc(conf->slab_cache, GFP_KERNEL); |
878 | if (!sh) | |
879 | return 0; | |
880 | memset(sh, 0, sizeof(*sh) + (conf->raid_disks-1)*sizeof(struct r5dev)); | |
881 | sh->raid_conf = conf; | |
882 | spin_lock_init(&sh->lock); | |
883 | ||
884 | if (grow_buffers(sh, conf->raid_disks)) { | |
885 | shrink_buffers(sh, conf->raid_disks); | |
886 | kmem_cache_free(conf->slab_cache, sh); | |
887 | return 0; | |
888 | } | |
7ecaa1e6 | 889 | sh->disks = conf->raid_disks; |
3f294f4f N |
890 | /* we just created an active stripe so... */ |
891 | atomic_set(&sh->count, 1); | |
892 | atomic_inc(&conf->active_stripes); | |
893 | INIT_LIST_HEAD(&sh->lru); | |
894 | release_stripe(sh); | |
895 | return 1; | |
896 | } | |
897 | ||
898 | static int grow_stripes(raid5_conf_t *conf, int num) | |
899 | { | |
e18b890b | 900 | struct kmem_cache *sc; |
1da177e4 LT |
901 | int devs = conf->raid_disks; |
902 | ||
42b9bebe N |
903 | sprintf(conf->cache_name[0], "raid5-%s", mdname(conf->mddev)); |
904 | sprintf(conf->cache_name[1], "raid5-%s-alt", mdname(conf->mddev)); | |
ad01c9e3 N |
905 | conf->active_name = 0; |
906 | sc = kmem_cache_create(conf->cache_name[conf->active_name], | |
1da177e4 | 907 | sizeof(struct stripe_head)+(devs-1)*sizeof(struct r5dev), |
20c2df83 | 908 | 0, 0, NULL); |
1da177e4 LT |
909 | if (!sc) |
910 | return 1; | |
911 | conf->slab_cache = sc; | |
ad01c9e3 | 912 | conf->pool_size = devs; |
16a53ecc | 913 | while (num--) |
3f294f4f | 914 | if (!grow_one_stripe(conf)) |
1da177e4 | 915 | return 1; |
1da177e4 LT |
916 | return 0; |
917 | } | |
29269553 N |
918 | |
919 | #ifdef CONFIG_MD_RAID5_RESHAPE | |
ad01c9e3 N |
920 | static int resize_stripes(raid5_conf_t *conf, int newsize) |
921 | { | |
922 | /* Make all the stripes able to hold 'newsize' devices. | |
923 | * New slots in each stripe get 'page' set to a new page. | |
924 | * | |
925 | * This happens in stages: | |
926 | * 1/ create a new kmem_cache and allocate the required number of | |
927 | * stripe_heads. | |
928 | * 2/ gather all the old stripe_heads and tranfer the pages across | |
929 | * to the new stripe_heads. This will have the side effect of | |
930 | * freezing the array as once all stripe_heads have been collected, | |
931 | * no IO will be possible. Old stripe heads are freed once their | |
932 | * pages have been transferred over, and the old kmem_cache is | |
933 | * freed when all stripes are done. | |
934 | * 3/ reallocate conf->disks to be suitable bigger. If this fails, | |
935 | * we simple return a failre status - no need to clean anything up. | |
936 | * 4/ allocate new pages for the new slots in the new stripe_heads. | |
937 | * If this fails, we don't bother trying the shrink the | |
938 | * stripe_heads down again, we just leave them as they are. | |
939 | * As each stripe_head is processed the new one is released into | |
940 | * active service. | |
941 | * | |
942 | * Once step2 is started, we cannot afford to wait for a write, | |
943 | * so we use GFP_NOIO allocations. | |
944 | */ | |
945 | struct stripe_head *osh, *nsh; | |
946 | LIST_HEAD(newstripes); | |
947 | struct disk_info *ndisks; | |
b5470dc5 | 948 | int err; |
e18b890b | 949 | struct kmem_cache *sc; |
ad01c9e3 N |
950 | int i; |
951 | ||
952 | if (newsize <= conf->pool_size) | |
953 | return 0; /* never bother to shrink */ | |
954 | ||
b5470dc5 DW |
955 | err = md_allow_write(conf->mddev); |
956 | if (err) | |
957 | return err; | |
2a2275d6 | 958 | |
ad01c9e3 N |
959 | /* Step 1 */ |
960 | sc = kmem_cache_create(conf->cache_name[1-conf->active_name], | |
961 | sizeof(struct stripe_head)+(newsize-1)*sizeof(struct r5dev), | |
20c2df83 | 962 | 0, 0, NULL); |
ad01c9e3 N |
963 | if (!sc) |
964 | return -ENOMEM; | |
965 | ||
966 | for (i = conf->max_nr_stripes; i; i--) { | |
967 | nsh = kmem_cache_alloc(sc, GFP_KERNEL); | |
968 | if (!nsh) | |
969 | break; | |
970 | ||
971 | memset(nsh, 0, sizeof(*nsh) + (newsize-1)*sizeof(struct r5dev)); | |
972 | ||
973 | nsh->raid_conf = conf; | |
974 | spin_lock_init(&nsh->lock); | |
975 | ||
976 | list_add(&nsh->lru, &newstripes); | |
977 | } | |
978 | if (i) { | |
979 | /* didn't get enough, give up */ | |
980 | while (!list_empty(&newstripes)) { | |
981 | nsh = list_entry(newstripes.next, struct stripe_head, lru); | |
982 | list_del(&nsh->lru); | |
983 | kmem_cache_free(sc, nsh); | |
984 | } | |
985 | kmem_cache_destroy(sc); | |
986 | return -ENOMEM; | |
987 | } | |
988 | /* Step 2 - Must use GFP_NOIO now. | |
989 | * OK, we have enough stripes, start collecting inactive | |
990 | * stripes and copying them over | |
991 | */ | |
992 | list_for_each_entry(nsh, &newstripes, lru) { | |
993 | spin_lock_irq(&conf->device_lock); | |
994 | wait_event_lock_irq(conf->wait_for_stripe, | |
995 | !list_empty(&conf->inactive_list), | |
996 | conf->device_lock, | |
b3b46be3 | 997 | unplug_slaves(conf->mddev) |
ad01c9e3 N |
998 | ); |
999 | osh = get_free_stripe(conf); | |
1000 | spin_unlock_irq(&conf->device_lock); | |
1001 | atomic_set(&nsh->count, 1); | |
1002 | for(i=0; i<conf->pool_size; i++) | |
1003 | nsh->dev[i].page = osh->dev[i].page; | |
1004 | for( ; i<newsize; i++) | |
1005 | nsh->dev[i].page = NULL; | |
1006 | kmem_cache_free(conf->slab_cache, osh); | |
1007 | } | |
1008 | kmem_cache_destroy(conf->slab_cache); | |
1009 | ||
1010 | /* Step 3. | |
1011 | * At this point, we are holding all the stripes so the array | |
1012 | * is completely stalled, so now is a good time to resize | |
1013 | * conf->disks. | |
1014 | */ | |
1015 | ndisks = kzalloc(newsize * sizeof(struct disk_info), GFP_NOIO); | |
1016 | if (ndisks) { | |
1017 | for (i=0; i<conf->raid_disks; i++) | |
1018 | ndisks[i] = conf->disks[i]; | |
1019 | kfree(conf->disks); | |
1020 | conf->disks = ndisks; | |
1021 | } else | |
1022 | err = -ENOMEM; | |
1023 | ||
1024 | /* Step 4, return new stripes to service */ | |
1025 | while(!list_empty(&newstripes)) { | |
1026 | nsh = list_entry(newstripes.next, struct stripe_head, lru); | |
1027 | list_del_init(&nsh->lru); | |
1028 | for (i=conf->raid_disks; i < newsize; i++) | |
1029 | if (nsh->dev[i].page == NULL) { | |
1030 | struct page *p = alloc_page(GFP_NOIO); | |
1031 | nsh->dev[i].page = p; | |
1032 | if (!p) | |
1033 | err = -ENOMEM; | |
1034 | } | |
1035 | release_stripe(nsh); | |
1036 | } | |
1037 | /* critical section pass, GFP_NOIO no longer needed */ | |
1038 | ||
1039 | conf->slab_cache = sc; | |
1040 | conf->active_name = 1-conf->active_name; | |
1041 | conf->pool_size = newsize; | |
1042 | return err; | |
1043 | } | |
29269553 | 1044 | #endif |
1da177e4 | 1045 | |
3f294f4f | 1046 | static int drop_one_stripe(raid5_conf_t *conf) |
1da177e4 LT |
1047 | { |
1048 | struct stripe_head *sh; | |
1049 | ||
3f294f4f N |
1050 | spin_lock_irq(&conf->device_lock); |
1051 | sh = get_free_stripe(conf); | |
1052 | spin_unlock_irq(&conf->device_lock); | |
1053 | if (!sh) | |
1054 | return 0; | |
78bafebd | 1055 | BUG_ON(atomic_read(&sh->count)); |
ad01c9e3 | 1056 | shrink_buffers(sh, conf->pool_size); |
3f294f4f N |
1057 | kmem_cache_free(conf->slab_cache, sh); |
1058 | atomic_dec(&conf->active_stripes); | |
1059 | return 1; | |
1060 | } | |
1061 | ||
1062 | static void shrink_stripes(raid5_conf_t *conf) | |
1063 | { | |
1064 | while (drop_one_stripe(conf)) | |
1065 | ; | |
1066 | ||
29fc7e3e N |
1067 | if (conf->slab_cache) |
1068 | kmem_cache_destroy(conf->slab_cache); | |
1da177e4 LT |
1069 | conf->slab_cache = NULL; |
1070 | } | |
1071 | ||
6712ecf8 | 1072 | static void raid5_end_read_request(struct bio * bi, int error) |
1da177e4 LT |
1073 | { |
1074 | struct stripe_head *sh = bi->bi_private; | |
1075 | raid5_conf_t *conf = sh->raid_conf; | |
7ecaa1e6 | 1076 | int disks = sh->disks, i; |
1da177e4 | 1077 | int uptodate = test_bit(BIO_UPTODATE, &bi->bi_flags); |
d6950432 N |
1078 | char b[BDEVNAME_SIZE]; |
1079 | mdk_rdev_t *rdev; | |
1da177e4 | 1080 | |
1da177e4 LT |
1081 | |
1082 | for (i=0 ; i<disks; i++) | |
1083 | if (bi == &sh->dev[i].req) | |
1084 | break; | |
1085 | ||
45b4233c DW |
1086 | pr_debug("end_read_request %llu/%d, count: %d, uptodate %d.\n", |
1087 | (unsigned long long)sh->sector, i, atomic_read(&sh->count), | |
1da177e4 LT |
1088 | uptodate); |
1089 | if (i == disks) { | |
1090 | BUG(); | |
6712ecf8 | 1091 | return; |
1da177e4 LT |
1092 | } |
1093 | ||
1094 | if (uptodate) { | |
1da177e4 | 1095 | set_bit(R5_UPTODATE, &sh->dev[i].flags); |
4e5314b5 | 1096 | if (test_bit(R5_ReadError, &sh->dev[i].flags)) { |
d6950432 | 1097 | rdev = conf->disks[i].rdev; |
6be9d494 BS |
1098 | printk_rl(KERN_INFO "raid5:%s: read error corrected" |
1099 | " (%lu sectors at %llu on %s)\n", | |
1100 | mdname(conf->mddev), STRIPE_SECTORS, | |
1101 | (unsigned long long)(sh->sector | |
1102 | + rdev->data_offset), | |
1103 | bdevname(rdev->bdev, b)); | |
4e5314b5 N |
1104 | clear_bit(R5_ReadError, &sh->dev[i].flags); |
1105 | clear_bit(R5_ReWrite, &sh->dev[i].flags); | |
1106 | } | |
ba22dcbf N |
1107 | if (atomic_read(&conf->disks[i].rdev->read_errors)) |
1108 | atomic_set(&conf->disks[i].rdev->read_errors, 0); | |
1da177e4 | 1109 | } else { |
d6950432 | 1110 | const char *bdn = bdevname(conf->disks[i].rdev->bdev, b); |
ba22dcbf | 1111 | int retry = 0; |
d6950432 N |
1112 | rdev = conf->disks[i].rdev; |
1113 | ||
1da177e4 | 1114 | clear_bit(R5_UPTODATE, &sh->dev[i].flags); |
d6950432 | 1115 | atomic_inc(&rdev->read_errors); |
ba22dcbf | 1116 | if (conf->mddev->degraded) |
6be9d494 BS |
1117 | printk_rl(KERN_WARNING |
1118 | "raid5:%s: read error not correctable " | |
1119 | "(sector %llu on %s).\n", | |
1120 | mdname(conf->mddev), | |
1121 | (unsigned long long)(sh->sector | |
1122 | + rdev->data_offset), | |
1123 | bdn); | |
ba22dcbf | 1124 | else if (test_bit(R5_ReWrite, &sh->dev[i].flags)) |
4e5314b5 | 1125 | /* Oh, no!!! */ |
6be9d494 BS |
1126 | printk_rl(KERN_WARNING |
1127 | "raid5:%s: read error NOT corrected!! " | |
1128 | "(sector %llu on %s).\n", | |
1129 | mdname(conf->mddev), | |
1130 | (unsigned long long)(sh->sector | |
1131 | + rdev->data_offset), | |
1132 | bdn); | |
d6950432 | 1133 | else if (atomic_read(&rdev->read_errors) |
ba22dcbf | 1134 | > conf->max_nr_stripes) |
14f8d26b | 1135 | printk(KERN_WARNING |
d6950432 N |
1136 | "raid5:%s: Too many read errors, failing device %s.\n", |
1137 | mdname(conf->mddev), bdn); | |
ba22dcbf N |
1138 | else |
1139 | retry = 1; | |
1140 | if (retry) | |
1141 | set_bit(R5_ReadError, &sh->dev[i].flags); | |
1142 | else { | |
4e5314b5 N |
1143 | clear_bit(R5_ReadError, &sh->dev[i].flags); |
1144 | clear_bit(R5_ReWrite, &sh->dev[i].flags); | |
d6950432 | 1145 | md_error(conf->mddev, rdev); |
ba22dcbf | 1146 | } |
1da177e4 LT |
1147 | } |
1148 | rdev_dec_pending(conf->disks[i].rdev, conf->mddev); | |
1da177e4 LT |
1149 | clear_bit(R5_LOCKED, &sh->dev[i].flags); |
1150 | set_bit(STRIPE_HANDLE, &sh->state); | |
1151 | release_stripe(sh); | |
1da177e4 LT |
1152 | } |
1153 | ||
6712ecf8 | 1154 | static void raid5_end_write_request (struct bio *bi, int error) |
1da177e4 LT |
1155 | { |
1156 | struct stripe_head *sh = bi->bi_private; | |
1157 | raid5_conf_t *conf = sh->raid_conf; | |
7ecaa1e6 | 1158 | int disks = sh->disks, i; |
1da177e4 LT |
1159 | int uptodate = test_bit(BIO_UPTODATE, &bi->bi_flags); |
1160 | ||
1da177e4 LT |
1161 | for (i=0 ; i<disks; i++) |
1162 | if (bi == &sh->dev[i].req) | |
1163 | break; | |
1164 | ||
45b4233c | 1165 | pr_debug("end_write_request %llu/%d, count %d, uptodate: %d.\n", |
1da177e4 LT |
1166 | (unsigned long long)sh->sector, i, atomic_read(&sh->count), |
1167 | uptodate); | |
1168 | if (i == disks) { | |
1169 | BUG(); | |
6712ecf8 | 1170 | return; |
1da177e4 LT |
1171 | } |
1172 | ||
1da177e4 LT |
1173 | if (!uptodate) |
1174 | md_error(conf->mddev, conf->disks[i].rdev); | |
1175 | ||
1176 | rdev_dec_pending(conf->disks[i].rdev, conf->mddev); | |
1177 | ||
1178 | clear_bit(R5_LOCKED, &sh->dev[i].flags); | |
1179 | set_bit(STRIPE_HANDLE, &sh->state); | |
c04be0aa | 1180 | release_stripe(sh); |
1da177e4 LT |
1181 | } |
1182 | ||
1183 | ||
1184 | static sector_t compute_blocknr(struct stripe_head *sh, int i); | |
1185 | ||
1186 | static void raid5_build_block (struct stripe_head *sh, int i) | |
1187 | { | |
1188 | struct r5dev *dev = &sh->dev[i]; | |
1189 | ||
1190 | bio_init(&dev->req); | |
1191 | dev->req.bi_io_vec = &dev->vec; | |
1192 | dev->req.bi_vcnt++; | |
1193 | dev->req.bi_max_vecs++; | |
1194 | dev->vec.bv_page = dev->page; | |
1195 | dev->vec.bv_len = STRIPE_SIZE; | |
1196 | dev->vec.bv_offset = 0; | |
1197 | ||
1198 | dev->req.bi_sector = sh->sector; | |
1199 | dev->req.bi_private = sh; | |
1200 | ||
1201 | dev->flags = 0; | |
16a53ecc | 1202 | dev->sector = compute_blocknr(sh, i); |
1da177e4 LT |
1203 | } |
1204 | ||
1205 | static void error(mddev_t *mddev, mdk_rdev_t *rdev) | |
1206 | { | |
1207 | char b[BDEVNAME_SIZE]; | |
1208 | raid5_conf_t *conf = (raid5_conf_t *) mddev->private; | |
45b4233c | 1209 | pr_debug("raid5: error called\n"); |
1da177e4 | 1210 | |
b2d444d7 | 1211 | if (!test_bit(Faulty, &rdev->flags)) { |
850b2b42 | 1212 | set_bit(MD_CHANGE_DEVS, &mddev->flags); |
c04be0aa N |
1213 | if (test_and_clear_bit(In_sync, &rdev->flags)) { |
1214 | unsigned long flags; | |
1215 | spin_lock_irqsave(&conf->device_lock, flags); | |
1da177e4 | 1216 | mddev->degraded++; |
c04be0aa | 1217 | spin_unlock_irqrestore(&conf->device_lock, flags); |
1da177e4 LT |
1218 | /* |
1219 | * if recovery was running, make sure it aborts. | |
1220 | */ | |
dfc70645 | 1221 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); |
1da177e4 | 1222 | } |
b2d444d7 | 1223 | set_bit(Faulty, &rdev->flags); |
1da177e4 | 1224 | printk (KERN_ALERT |
d7a420c9 NA |
1225 | "raid5: Disk failure on %s, disabling device.\n" |
1226 | "raid5: Operation continuing on %d devices.\n", | |
02c2de8c | 1227 | bdevname(rdev->bdev,b), conf->raid_disks - mddev->degraded); |
1da177e4 | 1228 | } |
16a53ecc | 1229 | } |
1da177e4 LT |
1230 | |
1231 | /* | |
1232 | * Input: a 'big' sector number, | |
1233 | * Output: index of the data and parity disk, and the sector # in them. | |
1234 | */ | |
1235 | static sector_t raid5_compute_sector(sector_t r_sector, unsigned int raid_disks, | |
1236 | unsigned int data_disks, unsigned int * dd_idx, | |
1237 | unsigned int * pd_idx, raid5_conf_t *conf) | |
1238 | { | |
1239 | long stripe; | |
1240 | unsigned long chunk_number; | |
1241 | unsigned int chunk_offset; | |
1242 | sector_t new_sector; | |
1243 | int sectors_per_chunk = conf->chunk_size >> 9; | |
1244 | ||
1245 | /* First compute the information on this sector */ | |
1246 | ||
1247 | /* | |
1248 | * Compute the chunk number and the sector offset inside the chunk | |
1249 | */ | |
1250 | chunk_offset = sector_div(r_sector, sectors_per_chunk); | |
1251 | chunk_number = r_sector; | |
1252 | BUG_ON(r_sector != chunk_number); | |
1253 | ||
1254 | /* | |
1255 | * Compute the stripe number | |
1256 | */ | |
1257 | stripe = chunk_number / data_disks; | |
1258 | ||
1259 | /* | |
1260 | * Compute the data disk and parity disk indexes inside the stripe | |
1261 | */ | |
1262 | *dd_idx = chunk_number % data_disks; | |
1263 | ||
1264 | /* | |
1265 | * Select the parity disk based on the user selected algorithm. | |
1266 | */ | |
16a53ecc N |
1267 | switch(conf->level) { |
1268 | case 4: | |
1da177e4 | 1269 | *pd_idx = data_disks; |
16a53ecc N |
1270 | break; |
1271 | case 5: | |
1272 | switch (conf->algorithm) { | |
1da177e4 LT |
1273 | case ALGORITHM_LEFT_ASYMMETRIC: |
1274 | *pd_idx = data_disks - stripe % raid_disks; | |
1275 | if (*dd_idx >= *pd_idx) | |
1276 | (*dd_idx)++; | |
1277 | break; | |
1278 | case ALGORITHM_RIGHT_ASYMMETRIC: | |
1279 | *pd_idx = stripe % raid_disks; | |
1280 | if (*dd_idx >= *pd_idx) | |
1281 | (*dd_idx)++; | |
1282 | break; | |
1283 | case ALGORITHM_LEFT_SYMMETRIC: | |
1284 | *pd_idx = data_disks - stripe % raid_disks; | |
1285 | *dd_idx = (*pd_idx + 1 + *dd_idx) % raid_disks; | |
1286 | break; | |
1287 | case ALGORITHM_RIGHT_SYMMETRIC: | |
1288 | *pd_idx = stripe % raid_disks; | |
1289 | *dd_idx = (*pd_idx + 1 + *dd_idx) % raid_disks; | |
1290 | break; | |
1291 | default: | |
14f8d26b | 1292 | printk(KERN_ERR "raid5: unsupported algorithm %d\n", |
1da177e4 | 1293 | conf->algorithm); |
16a53ecc N |
1294 | } |
1295 | break; | |
1296 | case 6: | |
1297 | ||
1298 | /**** FIX THIS ****/ | |
1299 | switch (conf->algorithm) { | |
1300 | case ALGORITHM_LEFT_ASYMMETRIC: | |
1301 | *pd_idx = raid_disks - 1 - (stripe % raid_disks); | |
1302 | if (*pd_idx == raid_disks-1) | |
1303 | (*dd_idx)++; /* Q D D D P */ | |
1304 | else if (*dd_idx >= *pd_idx) | |
1305 | (*dd_idx) += 2; /* D D P Q D */ | |
1306 | break; | |
1307 | case ALGORITHM_RIGHT_ASYMMETRIC: | |
1308 | *pd_idx = stripe % raid_disks; | |
1309 | if (*pd_idx == raid_disks-1) | |
1310 | (*dd_idx)++; /* Q D D D P */ | |
1311 | else if (*dd_idx >= *pd_idx) | |
1312 | (*dd_idx) += 2; /* D D P Q D */ | |
1313 | break; | |
1314 | case ALGORITHM_LEFT_SYMMETRIC: | |
1315 | *pd_idx = raid_disks - 1 - (stripe % raid_disks); | |
1316 | *dd_idx = (*pd_idx + 2 + *dd_idx) % raid_disks; | |
1317 | break; | |
1318 | case ALGORITHM_RIGHT_SYMMETRIC: | |
1319 | *pd_idx = stripe % raid_disks; | |
1320 | *dd_idx = (*pd_idx + 2 + *dd_idx) % raid_disks; | |
1321 | break; | |
1322 | default: | |
1323 | printk (KERN_CRIT "raid6: unsupported algorithm %d\n", | |
1324 | conf->algorithm); | |
1325 | } | |
1326 | break; | |
1da177e4 LT |
1327 | } |
1328 | ||
1329 | /* | |
1330 | * Finally, compute the new sector number | |
1331 | */ | |
1332 | new_sector = (sector_t)stripe * sectors_per_chunk + chunk_offset; | |
1333 | return new_sector; | |
1334 | } | |
1335 | ||
1336 | ||
1337 | static sector_t compute_blocknr(struct stripe_head *sh, int i) | |
1338 | { | |
1339 | raid5_conf_t *conf = sh->raid_conf; | |
b875e531 N |
1340 | int raid_disks = sh->disks; |
1341 | int data_disks = raid_disks - conf->max_degraded; | |
1da177e4 LT |
1342 | sector_t new_sector = sh->sector, check; |
1343 | int sectors_per_chunk = conf->chunk_size >> 9; | |
1344 | sector_t stripe; | |
1345 | int chunk_offset; | |
1346 | int chunk_number, dummy1, dummy2, dd_idx = i; | |
1347 | sector_t r_sector; | |
1348 | ||
16a53ecc | 1349 | |
1da177e4 LT |
1350 | chunk_offset = sector_div(new_sector, sectors_per_chunk); |
1351 | stripe = new_sector; | |
1352 | BUG_ON(new_sector != stripe); | |
1353 | ||
16a53ecc N |
1354 | if (i == sh->pd_idx) |
1355 | return 0; | |
1356 | switch(conf->level) { | |
1357 | case 4: break; | |
1358 | case 5: | |
1359 | switch (conf->algorithm) { | |
1da177e4 LT |
1360 | case ALGORITHM_LEFT_ASYMMETRIC: |
1361 | case ALGORITHM_RIGHT_ASYMMETRIC: | |
1362 | if (i > sh->pd_idx) | |
1363 | i--; | |
1364 | break; | |
1365 | case ALGORITHM_LEFT_SYMMETRIC: | |
1366 | case ALGORITHM_RIGHT_SYMMETRIC: | |
1367 | if (i < sh->pd_idx) | |
1368 | i += raid_disks; | |
1369 | i -= (sh->pd_idx + 1); | |
1370 | break; | |
1371 | default: | |
14f8d26b | 1372 | printk(KERN_ERR "raid5: unsupported algorithm %d\n", |
16a53ecc N |
1373 | conf->algorithm); |
1374 | } | |
1375 | break; | |
1376 | case 6: | |
16a53ecc N |
1377 | if (i == raid6_next_disk(sh->pd_idx, raid_disks)) |
1378 | return 0; /* It is the Q disk */ | |
1379 | switch (conf->algorithm) { | |
1380 | case ALGORITHM_LEFT_ASYMMETRIC: | |
1381 | case ALGORITHM_RIGHT_ASYMMETRIC: | |
1382 | if (sh->pd_idx == raid_disks-1) | |
1383 | i--; /* Q D D D P */ | |
1384 | else if (i > sh->pd_idx) | |
1385 | i -= 2; /* D D P Q D */ | |
1386 | break; | |
1387 | case ALGORITHM_LEFT_SYMMETRIC: | |
1388 | case ALGORITHM_RIGHT_SYMMETRIC: | |
1389 | if (sh->pd_idx == raid_disks-1) | |
1390 | i--; /* Q D D D P */ | |
1391 | else { | |
1392 | /* D D P Q D */ | |
1393 | if (i < sh->pd_idx) | |
1394 | i += raid_disks; | |
1395 | i -= (sh->pd_idx + 2); | |
1396 | } | |
1397 | break; | |
1398 | default: | |
1399 | printk (KERN_CRIT "raid6: unsupported algorithm %d\n", | |
1da177e4 | 1400 | conf->algorithm); |
16a53ecc N |
1401 | } |
1402 | break; | |
1da177e4 LT |
1403 | } |
1404 | ||
1405 | chunk_number = stripe * data_disks + i; | |
1406 | r_sector = (sector_t)chunk_number * sectors_per_chunk + chunk_offset; | |
1407 | ||
1408 | check = raid5_compute_sector (r_sector, raid_disks, data_disks, &dummy1, &dummy2, conf); | |
1409 | if (check != sh->sector || dummy1 != dd_idx || dummy2 != sh->pd_idx) { | |
14f8d26b | 1410 | printk(KERN_ERR "compute_blocknr: map not correct\n"); |
1da177e4 LT |
1411 | return 0; |
1412 | } | |
1413 | return r_sector; | |
1414 | } | |
1415 | ||
1416 | ||
1417 | ||
1418 | /* | |
16a53ecc N |
1419 | * Copy data between a page in the stripe cache, and one or more bion |
1420 | * The page could align with the middle of the bio, or there could be | |
1421 | * several bion, each with several bio_vecs, which cover part of the page | |
1422 | * Multiple bion are linked together on bi_next. There may be extras | |
1423 | * at the end of this list. We ignore them. | |
1da177e4 LT |
1424 | */ |
1425 | static void copy_data(int frombio, struct bio *bio, | |
1426 | struct page *page, | |
1427 | sector_t sector) | |
1428 | { | |
1429 | char *pa = page_address(page); | |
1430 | struct bio_vec *bvl; | |
1431 | int i; | |
1432 | int page_offset; | |
1433 | ||
1434 | if (bio->bi_sector >= sector) | |
1435 | page_offset = (signed)(bio->bi_sector - sector) * 512; | |
1436 | else | |
1437 | page_offset = (signed)(sector - bio->bi_sector) * -512; | |
1438 | bio_for_each_segment(bvl, bio, i) { | |
1439 | int len = bio_iovec_idx(bio,i)->bv_len; | |
1440 | int clen; | |
1441 | int b_offset = 0; | |
1442 | ||
1443 | if (page_offset < 0) { | |
1444 | b_offset = -page_offset; | |
1445 | page_offset += b_offset; | |
1446 | len -= b_offset; | |
1447 | } | |
1448 | ||
1449 | if (len > 0 && page_offset + len > STRIPE_SIZE) | |
1450 | clen = STRIPE_SIZE - page_offset; | |
1451 | else clen = len; | |
16a53ecc | 1452 | |
1da177e4 LT |
1453 | if (clen > 0) { |
1454 | char *ba = __bio_kmap_atomic(bio, i, KM_USER0); | |
1455 | if (frombio) | |
1456 | memcpy(pa+page_offset, ba+b_offset, clen); | |
1457 | else | |
1458 | memcpy(ba+b_offset, pa+page_offset, clen); | |
1459 | __bio_kunmap_atomic(ba, KM_USER0); | |
1460 | } | |
1461 | if (clen < len) /* hit end of page */ | |
1462 | break; | |
1463 | page_offset += len; | |
1464 | } | |
1465 | } | |
1466 | ||
9bc89cd8 DW |
1467 | #define check_xor() do { \ |
1468 | if (count == MAX_XOR_BLOCKS) { \ | |
1469 | xor_blocks(count, STRIPE_SIZE, dest, ptr);\ | |
1470 | count = 0; \ | |
1471 | } \ | |
1da177e4 LT |
1472 | } while(0) |
1473 | ||
16a53ecc N |
1474 | static void compute_parity6(struct stripe_head *sh, int method) |
1475 | { | |
1476 | raid6_conf_t *conf = sh->raid_conf; | |
f416885e | 1477 | int i, pd_idx = sh->pd_idx, qd_idx, d0_idx, disks = sh->disks, count; |
16a53ecc N |
1478 | struct bio *chosen; |
1479 | /**** FIX THIS: This could be very bad if disks is close to 256 ****/ | |
1480 | void *ptrs[disks]; | |
1481 | ||
1482 | qd_idx = raid6_next_disk(pd_idx, disks); | |
1483 | d0_idx = raid6_next_disk(qd_idx, disks); | |
1484 | ||
45b4233c | 1485 | pr_debug("compute_parity, stripe %llu, method %d\n", |
16a53ecc N |
1486 | (unsigned long long)sh->sector, method); |
1487 | ||
1488 | switch(method) { | |
1489 | case READ_MODIFY_WRITE: | |
1490 | BUG(); /* READ_MODIFY_WRITE N/A for RAID-6 */ | |
1491 | case RECONSTRUCT_WRITE: | |
1492 | for (i= disks; i-- ;) | |
1493 | if ( i != pd_idx && i != qd_idx && sh->dev[i].towrite ) { | |
1494 | chosen = sh->dev[i].towrite; | |
1495 | sh->dev[i].towrite = NULL; | |
1496 | ||
1497 | if (test_and_clear_bit(R5_Overlap, &sh->dev[i].flags)) | |
1498 | wake_up(&conf->wait_for_overlap); | |
1499 | ||
52e5f9d1 | 1500 | BUG_ON(sh->dev[i].written); |
16a53ecc N |
1501 | sh->dev[i].written = chosen; |
1502 | } | |
1503 | break; | |
1504 | case CHECK_PARITY: | |
1505 | BUG(); /* Not implemented yet */ | |
1506 | } | |
1507 | ||
1508 | for (i = disks; i--;) | |
1509 | if (sh->dev[i].written) { | |
1510 | sector_t sector = sh->dev[i].sector; | |
1511 | struct bio *wbi = sh->dev[i].written; | |
1512 | while (wbi && wbi->bi_sector < sector + STRIPE_SECTORS) { | |
1513 | copy_data(1, wbi, sh->dev[i].page, sector); | |
1514 | wbi = r5_next_bio(wbi, sector); | |
1515 | } | |
1516 | ||
1517 | set_bit(R5_LOCKED, &sh->dev[i].flags); | |
1518 | set_bit(R5_UPTODATE, &sh->dev[i].flags); | |
1519 | } | |
1520 | ||
1521 | // switch(method) { | |
1522 | // case RECONSTRUCT_WRITE: | |
1523 | // case CHECK_PARITY: | |
1524 | // case UPDATE_PARITY: | |
1525 | /* Note that unlike RAID-5, the ordering of the disks matters greatly. */ | |
1526 | /* FIX: Is this ordering of drives even remotely optimal? */ | |
1527 | count = 0; | |
1528 | i = d0_idx; | |
1529 | do { | |
1530 | ptrs[count++] = page_address(sh->dev[i].page); | |
1531 | if (count <= disks-2 && !test_bit(R5_UPTODATE, &sh->dev[i].flags)) | |
1532 | printk("block %d/%d not uptodate on parity calc\n", i,count); | |
1533 | i = raid6_next_disk(i, disks); | |
1534 | } while ( i != d0_idx ); | |
1535 | // break; | |
1536 | // } | |
1537 | ||
1538 | raid6_call.gen_syndrome(disks, STRIPE_SIZE, ptrs); | |
1539 | ||
1540 | switch(method) { | |
1541 | case RECONSTRUCT_WRITE: | |
1542 | set_bit(R5_UPTODATE, &sh->dev[pd_idx].flags); | |
1543 | set_bit(R5_UPTODATE, &sh->dev[qd_idx].flags); | |
1544 | set_bit(R5_LOCKED, &sh->dev[pd_idx].flags); | |
1545 | set_bit(R5_LOCKED, &sh->dev[qd_idx].flags); | |
1546 | break; | |
1547 | case UPDATE_PARITY: | |
1548 | set_bit(R5_UPTODATE, &sh->dev[pd_idx].flags); | |
1549 | set_bit(R5_UPTODATE, &sh->dev[qd_idx].flags); | |
1550 | break; | |
1551 | } | |
1552 | } | |
1553 | ||
1554 | ||
1555 | /* Compute one missing block */ | |
1556 | static void compute_block_1(struct stripe_head *sh, int dd_idx, int nozero) | |
1557 | { | |
f416885e | 1558 | int i, count, disks = sh->disks; |
9bc89cd8 | 1559 | void *ptr[MAX_XOR_BLOCKS], *dest, *p; |
16a53ecc N |
1560 | int pd_idx = sh->pd_idx; |
1561 | int qd_idx = raid6_next_disk(pd_idx, disks); | |
1562 | ||
45b4233c | 1563 | pr_debug("compute_block_1, stripe %llu, idx %d\n", |
16a53ecc N |
1564 | (unsigned long long)sh->sector, dd_idx); |
1565 | ||
1566 | if ( dd_idx == qd_idx ) { | |
1567 | /* We're actually computing the Q drive */ | |
1568 | compute_parity6(sh, UPDATE_PARITY); | |
1569 | } else { | |
9bc89cd8 DW |
1570 | dest = page_address(sh->dev[dd_idx].page); |
1571 | if (!nozero) memset(dest, 0, STRIPE_SIZE); | |
1572 | count = 0; | |
16a53ecc N |
1573 | for (i = disks ; i--; ) { |
1574 | if (i == dd_idx || i == qd_idx) | |
1575 | continue; | |
1576 | p = page_address(sh->dev[i].page); | |
1577 | if (test_bit(R5_UPTODATE, &sh->dev[i].flags)) | |
1578 | ptr[count++] = p; | |
1579 | else | |
1580 | printk("compute_block() %d, stripe %llu, %d" | |
1581 | " not present\n", dd_idx, | |
1582 | (unsigned long long)sh->sector, i); | |
1583 | ||
1584 | check_xor(); | |
1585 | } | |
9bc89cd8 DW |
1586 | if (count) |
1587 | xor_blocks(count, STRIPE_SIZE, dest, ptr); | |
16a53ecc N |
1588 | if (!nozero) set_bit(R5_UPTODATE, &sh->dev[dd_idx].flags); |
1589 | else clear_bit(R5_UPTODATE, &sh->dev[dd_idx].flags); | |
1590 | } | |
1591 | } | |
1592 | ||
1593 | /* Compute two missing blocks */ | |
1594 | static void compute_block_2(struct stripe_head *sh, int dd_idx1, int dd_idx2) | |
1595 | { | |
f416885e | 1596 | int i, count, disks = sh->disks; |
16a53ecc N |
1597 | int pd_idx = sh->pd_idx; |
1598 | int qd_idx = raid6_next_disk(pd_idx, disks); | |
1599 | int d0_idx = raid6_next_disk(qd_idx, disks); | |
1600 | int faila, failb; | |
1601 | ||
1602 | /* faila and failb are disk numbers relative to d0_idx */ | |
1603 | /* pd_idx become disks-2 and qd_idx become disks-1 */ | |
1604 | faila = (dd_idx1 < d0_idx) ? dd_idx1+(disks-d0_idx) : dd_idx1-d0_idx; | |
1605 | failb = (dd_idx2 < d0_idx) ? dd_idx2+(disks-d0_idx) : dd_idx2-d0_idx; | |
1606 | ||
1607 | BUG_ON(faila == failb); | |
1608 | if ( failb < faila ) { int tmp = faila; faila = failb; failb = tmp; } | |
1609 | ||
45b4233c | 1610 | pr_debug("compute_block_2, stripe %llu, idx %d,%d (%d,%d)\n", |
16a53ecc N |
1611 | (unsigned long long)sh->sector, dd_idx1, dd_idx2, faila, failb); |
1612 | ||
1613 | if ( failb == disks-1 ) { | |
1614 | /* Q disk is one of the missing disks */ | |
1615 | if ( faila == disks-2 ) { | |
1616 | /* Missing P+Q, just recompute */ | |
1617 | compute_parity6(sh, UPDATE_PARITY); | |
1618 | return; | |
1619 | } else { | |
1620 | /* We're missing D+Q; recompute D from P */ | |
1621 | compute_block_1(sh, (dd_idx1 == qd_idx) ? dd_idx2 : dd_idx1, 0); | |
1622 | compute_parity6(sh, UPDATE_PARITY); /* Is this necessary? */ | |
1623 | return; | |
1624 | } | |
1625 | } | |
1626 | ||
1627 | /* We're missing D+P or D+D; build pointer table */ | |
1628 | { | |
1629 | /**** FIX THIS: This could be very bad if disks is close to 256 ****/ | |
1630 | void *ptrs[disks]; | |
1631 | ||
1632 | count = 0; | |
1633 | i = d0_idx; | |
1634 | do { | |
1635 | ptrs[count++] = page_address(sh->dev[i].page); | |
1636 | i = raid6_next_disk(i, disks); | |
1637 | if (i != dd_idx1 && i != dd_idx2 && | |
1638 | !test_bit(R5_UPTODATE, &sh->dev[i].flags)) | |
1639 | printk("compute_2 with missing block %d/%d\n", count, i); | |
1640 | } while ( i != d0_idx ); | |
1641 | ||
1642 | if ( failb == disks-2 ) { | |
1643 | /* We're missing D+P. */ | |
1644 | raid6_datap_recov(disks, STRIPE_SIZE, faila, ptrs); | |
1645 | } else { | |
1646 | /* We're missing D+D. */ | |
1647 | raid6_2data_recov(disks, STRIPE_SIZE, faila, failb, ptrs); | |
1648 | } | |
1649 | ||
1650 | /* Both the above update both missing blocks */ | |
1651 | set_bit(R5_UPTODATE, &sh->dev[dd_idx1].flags); | |
1652 | set_bit(R5_UPTODATE, &sh->dev[dd_idx2].flags); | |
1653 | } | |
1654 | } | |
1655 | ||
600aa109 | 1656 | static void |
1fe797e6 | 1657 | schedule_reconstruction5(struct stripe_head *sh, struct stripe_head_state *s, |
600aa109 | 1658 | int rcw, int expand) |
e33129d8 DW |
1659 | { |
1660 | int i, pd_idx = sh->pd_idx, disks = sh->disks; | |
e33129d8 DW |
1661 | |
1662 | if (rcw) { | |
1663 | /* if we are not expanding this is a proper write request, and | |
1664 | * there will be bios with new data to be drained into the | |
1665 | * stripe cache | |
1666 | */ | |
1667 | if (!expand) { | |
600aa109 DW |
1668 | sh->reconstruct_state = reconstruct_state_drain_run; |
1669 | set_bit(STRIPE_OP_BIODRAIN, &s->ops_request); | |
1670 | } else | |
1671 | sh->reconstruct_state = reconstruct_state_run; | |
16a53ecc | 1672 | |
600aa109 | 1673 | set_bit(STRIPE_OP_POSTXOR, &s->ops_request); |
e33129d8 DW |
1674 | |
1675 | for (i = disks; i--; ) { | |
1676 | struct r5dev *dev = &sh->dev[i]; | |
1677 | ||
1678 | if (dev->towrite) { | |
1679 | set_bit(R5_LOCKED, &dev->flags); | |
d8ee0728 | 1680 | set_bit(R5_Wantdrain, &dev->flags); |
e33129d8 DW |
1681 | if (!expand) |
1682 | clear_bit(R5_UPTODATE, &dev->flags); | |
600aa109 | 1683 | s->locked++; |
e33129d8 DW |
1684 | } |
1685 | } | |
600aa109 | 1686 | if (s->locked + 1 == disks) |
8b3e6cdc DW |
1687 | if (!test_and_set_bit(STRIPE_FULL_WRITE, &sh->state)) |
1688 | atomic_inc(&sh->raid_conf->pending_full_writes); | |
e33129d8 DW |
1689 | } else { |
1690 | BUG_ON(!(test_bit(R5_UPTODATE, &sh->dev[pd_idx].flags) || | |
1691 | test_bit(R5_Wantcompute, &sh->dev[pd_idx].flags))); | |
1692 | ||
d8ee0728 | 1693 | sh->reconstruct_state = reconstruct_state_prexor_drain_run; |
600aa109 DW |
1694 | set_bit(STRIPE_OP_PREXOR, &s->ops_request); |
1695 | set_bit(STRIPE_OP_BIODRAIN, &s->ops_request); | |
1696 | set_bit(STRIPE_OP_POSTXOR, &s->ops_request); | |
e33129d8 DW |
1697 | |
1698 | for (i = disks; i--; ) { | |
1699 | struct r5dev *dev = &sh->dev[i]; | |
1700 | if (i == pd_idx) | |
1701 | continue; | |
1702 | ||
e33129d8 DW |
1703 | if (dev->towrite && |
1704 | (test_bit(R5_UPTODATE, &dev->flags) || | |
d8ee0728 DW |
1705 | test_bit(R5_Wantcompute, &dev->flags))) { |
1706 | set_bit(R5_Wantdrain, &dev->flags); | |
e33129d8 DW |
1707 | set_bit(R5_LOCKED, &dev->flags); |
1708 | clear_bit(R5_UPTODATE, &dev->flags); | |
600aa109 | 1709 | s->locked++; |
e33129d8 DW |
1710 | } |
1711 | } | |
1712 | } | |
1713 | ||
1714 | /* keep the parity disk locked while asynchronous operations | |
1715 | * are in flight | |
1716 | */ | |
1717 | set_bit(R5_LOCKED, &sh->dev[pd_idx].flags); | |
1718 | clear_bit(R5_UPTODATE, &sh->dev[pd_idx].flags); | |
600aa109 | 1719 | s->locked++; |
e33129d8 | 1720 | |
600aa109 | 1721 | pr_debug("%s: stripe %llu locked: %d ops_request: %lx\n", |
e46b272b | 1722 | __func__, (unsigned long long)sh->sector, |
600aa109 | 1723 | s->locked, s->ops_request); |
e33129d8 | 1724 | } |
16a53ecc | 1725 | |
1da177e4 LT |
1726 | /* |
1727 | * Each stripe/dev can have one or more bion attached. | |
16a53ecc | 1728 | * toread/towrite point to the first in a chain. |
1da177e4 LT |
1729 | * The bi_next chain must be in order. |
1730 | */ | |
1731 | static int add_stripe_bio(struct stripe_head *sh, struct bio *bi, int dd_idx, int forwrite) | |
1732 | { | |
1733 | struct bio **bip; | |
1734 | raid5_conf_t *conf = sh->raid_conf; | |
72626685 | 1735 | int firstwrite=0; |
1da177e4 | 1736 | |
45b4233c | 1737 | pr_debug("adding bh b#%llu to stripe s#%llu\n", |
1da177e4 LT |
1738 | (unsigned long long)bi->bi_sector, |
1739 | (unsigned long long)sh->sector); | |
1740 | ||
1741 | ||
1742 | spin_lock(&sh->lock); | |
1743 | spin_lock_irq(&conf->device_lock); | |
72626685 | 1744 | if (forwrite) { |
1da177e4 | 1745 | bip = &sh->dev[dd_idx].towrite; |
72626685 N |
1746 | if (*bip == NULL && sh->dev[dd_idx].written == NULL) |
1747 | firstwrite = 1; | |
1748 | } else | |
1da177e4 LT |
1749 | bip = &sh->dev[dd_idx].toread; |
1750 | while (*bip && (*bip)->bi_sector < bi->bi_sector) { | |
1751 | if ((*bip)->bi_sector + ((*bip)->bi_size >> 9) > bi->bi_sector) | |
1752 | goto overlap; | |
1753 | bip = & (*bip)->bi_next; | |
1754 | } | |
1755 | if (*bip && (*bip)->bi_sector < bi->bi_sector + ((bi->bi_size)>>9)) | |
1756 | goto overlap; | |
1757 | ||
78bafebd | 1758 | BUG_ON(*bip && bi->bi_next && (*bip) != bi->bi_next); |
1da177e4 LT |
1759 | if (*bip) |
1760 | bi->bi_next = *bip; | |
1761 | *bip = bi; | |
960e739d | 1762 | bi->bi_phys_segments++; |
1da177e4 LT |
1763 | spin_unlock_irq(&conf->device_lock); |
1764 | spin_unlock(&sh->lock); | |
1765 | ||
45b4233c | 1766 | pr_debug("added bi b#%llu to stripe s#%llu, disk %d.\n", |
1da177e4 LT |
1767 | (unsigned long long)bi->bi_sector, |
1768 | (unsigned long long)sh->sector, dd_idx); | |
1769 | ||
72626685 | 1770 | if (conf->mddev->bitmap && firstwrite) { |
72626685 N |
1771 | bitmap_startwrite(conf->mddev->bitmap, sh->sector, |
1772 | STRIPE_SECTORS, 0); | |
ae3c20cc | 1773 | sh->bm_seq = conf->seq_flush+1; |
72626685 N |
1774 | set_bit(STRIPE_BIT_DELAY, &sh->state); |
1775 | } | |
1776 | ||
1da177e4 LT |
1777 | if (forwrite) { |
1778 | /* check if page is covered */ | |
1779 | sector_t sector = sh->dev[dd_idx].sector; | |
1780 | for (bi=sh->dev[dd_idx].towrite; | |
1781 | sector < sh->dev[dd_idx].sector + STRIPE_SECTORS && | |
1782 | bi && bi->bi_sector <= sector; | |
1783 | bi = r5_next_bio(bi, sh->dev[dd_idx].sector)) { | |
1784 | if (bi->bi_sector + (bi->bi_size>>9) >= sector) | |
1785 | sector = bi->bi_sector + (bi->bi_size>>9); | |
1786 | } | |
1787 | if (sector >= sh->dev[dd_idx].sector + STRIPE_SECTORS) | |
1788 | set_bit(R5_OVERWRITE, &sh->dev[dd_idx].flags); | |
1789 | } | |
1790 | return 1; | |
1791 | ||
1792 | overlap: | |
1793 | set_bit(R5_Overlap, &sh->dev[dd_idx].flags); | |
1794 | spin_unlock_irq(&conf->device_lock); | |
1795 | spin_unlock(&sh->lock); | |
1796 | return 0; | |
1797 | } | |
1798 | ||
29269553 N |
1799 | static void end_reshape(raid5_conf_t *conf); |
1800 | ||
16a53ecc N |
1801 | static int page_is_zero(struct page *p) |
1802 | { | |
1803 | char *a = page_address(p); | |
1804 | return ((*(u32*)a) == 0 && | |
1805 | memcmp(a, a+4, STRIPE_SIZE-4)==0); | |
1806 | } | |
1807 | ||
ccfcc3c1 N |
1808 | static int stripe_to_pdidx(sector_t stripe, raid5_conf_t *conf, int disks) |
1809 | { | |
1810 | int sectors_per_chunk = conf->chunk_size >> 9; | |
ccfcc3c1 | 1811 | int pd_idx, dd_idx; |
2d2063ce CQH |
1812 | int chunk_offset = sector_div(stripe, sectors_per_chunk); |
1813 | ||
b875e531 N |
1814 | raid5_compute_sector(stripe * (disks - conf->max_degraded) |
1815 | *sectors_per_chunk + chunk_offset, | |
1816 | disks, disks - conf->max_degraded, | |
1817 | &dd_idx, &pd_idx, conf); | |
ccfcc3c1 N |
1818 | return pd_idx; |
1819 | } | |
1820 | ||
a4456856 | 1821 | static void |
1fe797e6 | 1822 | handle_failed_stripe(raid5_conf_t *conf, struct stripe_head *sh, |
a4456856 DW |
1823 | struct stripe_head_state *s, int disks, |
1824 | struct bio **return_bi) | |
1825 | { | |
1826 | int i; | |
1827 | for (i = disks; i--; ) { | |
1828 | struct bio *bi; | |
1829 | int bitmap_end = 0; | |
1830 | ||
1831 | if (test_bit(R5_ReadError, &sh->dev[i].flags)) { | |
1832 | mdk_rdev_t *rdev; | |
1833 | rcu_read_lock(); | |
1834 | rdev = rcu_dereference(conf->disks[i].rdev); | |
1835 | if (rdev && test_bit(In_sync, &rdev->flags)) | |
1836 | /* multiple read failures in one stripe */ | |
1837 | md_error(conf->mddev, rdev); | |
1838 | rcu_read_unlock(); | |
1839 | } | |
1840 | spin_lock_irq(&conf->device_lock); | |
1841 | /* fail all writes first */ | |
1842 | bi = sh->dev[i].towrite; | |
1843 | sh->dev[i].towrite = NULL; | |
1844 | if (bi) { | |
1845 | s->to_write--; | |
1846 | bitmap_end = 1; | |
1847 | } | |
1848 | ||
1849 | if (test_and_clear_bit(R5_Overlap, &sh->dev[i].flags)) | |
1850 | wake_up(&conf->wait_for_overlap); | |
1851 | ||
1852 | while (bi && bi->bi_sector < | |
1853 | sh->dev[i].sector + STRIPE_SECTORS) { | |
1854 | struct bio *nextbi = r5_next_bio(bi, sh->dev[i].sector); | |
1855 | clear_bit(BIO_UPTODATE, &bi->bi_flags); | |
960e739d | 1856 | if (!raid5_dec_bi_phys_segments(bi)) { |
a4456856 DW |
1857 | md_write_end(conf->mddev); |
1858 | bi->bi_next = *return_bi; | |
1859 | *return_bi = bi; | |
1860 | } | |
1861 | bi = nextbi; | |
1862 | } | |
1863 | /* and fail all 'written' */ | |
1864 | bi = sh->dev[i].written; | |
1865 | sh->dev[i].written = NULL; | |
1866 | if (bi) bitmap_end = 1; | |
1867 | while (bi && bi->bi_sector < | |
1868 | sh->dev[i].sector + STRIPE_SECTORS) { | |
1869 | struct bio *bi2 = r5_next_bio(bi, sh->dev[i].sector); | |
1870 | clear_bit(BIO_UPTODATE, &bi->bi_flags); | |
960e739d | 1871 | if (!raid5_dec_bi_phys_segments(bi)) { |
a4456856 DW |
1872 | md_write_end(conf->mddev); |
1873 | bi->bi_next = *return_bi; | |
1874 | *return_bi = bi; | |
1875 | } | |
1876 | bi = bi2; | |
1877 | } | |
1878 | ||
b5e98d65 DW |
1879 | /* fail any reads if this device is non-operational and |
1880 | * the data has not reached the cache yet. | |
1881 | */ | |
1882 | if (!test_bit(R5_Wantfill, &sh->dev[i].flags) && | |
1883 | (!test_bit(R5_Insync, &sh->dev[i].flags) || | |
1884 | test_bit(R5_ReadError, &sh->dev[i].flags))) { | |
a4456856 DW |
1885 | bi = sh->dev[i].toread; |
1886 | sh->dev[i].toread = NULL; | |
1887 | if (test_and_clear_bit(R5_Overlap, &sh->dev[i].flags)) | |
1888 | wake_up(&conf->wait_for_overlap); | |
1889 | if (bi) s->to_read--; | |
1890 | while (bi && bi->bi_sector < | |
1891 | sh->dev[i].sector + STRIPE_SECTORS) { | |
1892 | struct bio *nextbi = | |
1893 | r5_next_bio(bi, sh->dev[i].sector); | |
1894 | clear_bit(BIO_UPTODATE, &bi->bi_flags); | |
960e739d | 1895 | if (!raid5_dec_bi_phys_segments(bi)) { |
a4456856 DW |
1896 | bi->bi_next = *return_bi; |
1897 | *return_bi = bi; | |
1898 | } | |
1899 | bi = nextbi; | |
1900 | } | |
1901 | } | |
1902 | spin_unlock_irq(&conf->device_lock); | |
1903 | if (bitmap_end) | |
1904 | bitmap_endwrite(conf->mddev->bitmap, sh->sector, | |
1905 | STRIPE_SECTORS, 0, 0); | |
1906 | } | |
1907 | ||
8b3e6cdc DW |
1908 | if (test_and_clear_bit(STRIPE_FULL_WRITE, &sh->state)) |
1909 | if (atomic_dec_and_test(&conf->pending_full_writes)) | |
1910 | md_wakeup_thread(conf->mddev->thread); | |
a4456856 DW |
1911 | } |
1912 | ||
1fe797e6 DW |
1913 | /* fetch_block5 - checks the given member device to see if its data needs |
1914 | * to be read or computed to satisfy a request. | |
1915 | * | |
1916 | * Returns 1 when no more member devices need to be checked, otherwise returns | |
1917 | * 0 to tell the loop in handle_stripe_fill5 to continue | |
f38e1219 | 1918 | */ |
1fe797e6 DW |
1919 | static int fetch_block5(struct stripe_head *sh, struct stripe_head_state *s, |
1920 | int disk_idx, int disks) | |
f38e1219 DW |
1921 | { |
1922 | struct r5dev *dev = &sh->dev[disk_idx]; | |
1923 | struct r5dev *failed_dev = &sh->dev[s->failed_num]; | |
1924 | ||
f38e1219 DW |
1925 | /* is the data in this block needed, and can we get it? */ |
1926 | if (!test_bit(R5_LOCKED, &dev->flags) && | |
1fe797e6 DW |
1927 | !test_bit(R5_UPTODATE, &dev->flags) && |
1928 | (dev->toread || | |
1929 | (dev->towrite && !test_bit(R5_OVERWRITE, &dev->flags)) || | |
1930 | s->syncing || s->expanding || | |
1931 | (s->failed && | |
1932 | (failed_dev->toread || | |
1933 | (failed_dev->towrite && | |
1934 | !test_bit(R5_OVERWRITE, &failed_dev->flags)))))) { | |
976ea8d4 DW |
1935 | /* We would like to get this block, possibly by computing it, |
1936 | * otherwise read it if the backing disk is insync | |
f38e1219 DW |
1937 | */ |
1938 | if ((s->uptodate == disks - 1) && | |
ecc65c9b | 1939 | (s->failed && disk_idx == s->failed_num)) { |
976ea8d4 DW |
1940 | set_bit(STRIPE_COMPUTE_RUN, &sh->state); |
1941 | set_bit(STRIPE_OP_COMPUTE_BLK, &s->ops_request); | |
f38e1219 DW |
1942 | set_bit(R5_Wantcompute, &dev->flags); |
1943 | sh->ops.target = disk_idx; | |
1944 | s->req_compute = 1; | |
f38e1219 DW |
1945 | /* Careful: from this point on 'uptodate' is in the eye |
1946 | * of raid5_run_ops which services 'compute' operations | |
1947 | * before writes. R5_Wantcompute flags a block that will | |
1948 | * be R5_UPTODATE by the time it is needed for a | |
1949 | * subsequent operation. | |
1950 | */ | |
1951 | s->uptodate++; | |
1fe797e6 | 1952 | return 1; /* uptodate + compute == disks */ |
7a1fc53c | 1953 | } else if (test_bit(R5_Insync, &dev->flags)) { |
f38e1219 DW |
1954 | set_bit(R5_LOCKED, &dev->flags); |
1955 | set_bit(R5_Wantread, &dev->flags); | |
f38e1219 DW |
1956 | s->locked++; |
1957 | pr_debug("Reading block %d (sync=%d)\n", disk_idx, | |
1958 | s->syncing); | |
1959 | } | |
1960 | } | |
1961 | ||
1fe797e6 | 1962 | return 0; |
f38e1219 DW |
1963 | } |
1964 | ||
1fe797e6 DW |
1965 | /** |
1966 | * handle_stripe_fill5 - read or compute data to satisfy pending requests. | |
1967 | */ | |
1968 | static void handle_stripe_fill5(struct stripe_head *sh, | |
a4456856 DW |
1969 | struct stripe_head_state *s, int disks) |
1970 | { | |
1971 | int i; | |
f38e1219 | 1972 | |
f38e1219 DW |
1973 | /* look for blocks to read/compute, skip this if a compute |
1974 | * is already in flight, or if the stripe contents are in the | |
1975 | * midst of changing due to a write | |
1976 | */ | |
976ea8d4 | 1977 | if (!test_bit(STRIPE_COMPUTE_RUN, &sh->state) && !sh->check_state && |
1fe797e6 | 1978 | !sh->reconstruct_state) |
f38e1219 | 1979 | for (i = disks; i--; ) |
1fe797e6 | 1980 | if (fetch_block5(sh, s, i, disks)) |
f38e1219 | 1981 | break; |
a4456856 DW |
1982 | set_bit(STRIPE_HANDLE, &sh->state); |
1983 | } | |
1984 | ||
1fe797e6 | 1985 | static void handle_stripe_fill6(struct stripe_head *sh, |
a4456856 DW |
1986 | struct stripe_head_state *s, struct r6_state *r6s, |
1987 | int disks) | |
1988 | { | |
1989 | int i; | |
1990 | for (i = disks; i--; ) { | |
1991 | struct r5dev *dev = &sh->dev[i]; | |
1992 | if (!test_bit(R5_LOCKED, &dev->flags) && | |
1993 | !test_bit(R5_UPTODATE, &dev->flags) && | |
1994 | (dev->toread || (dev->towrite && | |
1995 | !test_bit(R5_OVERWRITE, &dev->flags)) || | |
1996 | s->syncing || s->expanding || | |
1997 | (s->failed >= 1 && | |
1998 | (sh->dev[r6s->failed_num[0]].toread || | |
1999 | s->to_write)) || | |
2000 | (s->failed >= 2 && | |
2001 | (sh->dev[r6s->failed_num[1]].toread || | |
2002 | s->to_write)))) { | |
2003 | /* we would like to get this block, possibly | |
2004 | * by computing it, but we might not be able to | |
2005 | */ | |
c337869d DW |
2006 | if ((s->uptodate == disks - 1) && |
2007 | (s->failed && (i == r6s->failed_num[0] || | |
2008 | i == r6s->failed_num[1]))) { | |
45b4233c | 2009 | pr_debug("Computing stripe %llu block %d\n", |
a4456856 DW |
2010 | (unsigned long long)sh->sector, i); |
2011 | compute_block_1(sh, i, 0); | |
2012 | s->uptodate++; | |
2013 | } else if ( s->uptodate == disks-2 && s->failed >= 2 ) { | |
2014 | /* Computing 2-failure is *very* expensive; only | |
2015 | * do it if failed >= 2 | |
2016 | */ | |
2017 | int other; | |
2018 | for (other = disks; other--; ) { | |
2019 | if (other == i) | |
2020 | continue; | |
2021 | if (!test_bit(R5_UPTODATE, | |
2022 | &sh->dev[other].flags)) | |
2023 | break; | |
2024 | } | |
2025 | BUG_ON(other < 0); | |
45b4233c | 2026 | pr_debug("Computing stripe %llu blocks %d,%d\n", |
a4456856 DW |
2027 | (unsigned long long)sh->sector, |
2028 | i, other); | |
2029 | compute_block_2(sh, i, other); | |
2030 | s->uptodate += 2; | |
2031 | } else if (test_bit(R5_Insync, &dev->flags)) { | |
2032 | set_bit(R5_LOCKED, &dev->flags); | |
2033 | set_bit(R5_Wantread, &dev->flags); | |
2034 | s->locked++; | |
45b4233c | 2035 | pr_debug("Reading block %d (sync=%d)\n", |
a4456856 DW |
2036 | i, s->syncing); |
2037 | } | |
2038 | } | |
2039 | } | |
2040 | set_bit(STRIPE_HANDLE, &sh->state); | |
2041 | } | |
2042 | ||
2043 | ||
1fe797e6 | 2044 | /* handle_stripe_clean_event |
a4456856 DW |
2045 | * any written block on an uptodate or failed drive can be returned. |
2046 | * Note that if we 'wrote' to a failed drive, it will be UPTODATE, but | |
2047 | * never LOCKED, so we don't need to test 'failed' directly. | |
2048 | */ | |
1fe797e6 | 2049 | static void handle_stripe_clean_event(raid5_conf_t *conf, |
a4456856 DW |
2050 | struct stripe_head *sh, int disks, struct bio **return_bi) |
2051 | { | |
2052 | int i; | |
2053 | struct r5dev *dev; | |
2054 | ||
2055 | for (i = disks; i--; ) | |
2056 | if (sh->dev[i].written) { | |
2057 | dev = &sh->dev[i]; | |
2058 | if (!test_bit(R5_LOCKED, &dev->flags) && | |
2059 | test_bit(R5_UPTODATE, &dev->flags)) { | |
2060 | /* We can return any write requests */ | |
2061 | struct bio *wbi, *wbi2; | |
2062 | int bitmap_end = 0; | |
45b4233c | 2063 | pr_debug("Return write for disc %d\n", i); |
a4456856 DW |
2064 | spin_lock_irq(&conf->device_lock); |
2065 | wbi = dev->written; | |
2066 | dev->written = NULL; | |
2067 | while (wbi && wbi->bi_sector < | |
2068 | dev->sector + STRIPE_SECTORS) { | |
2069 | wbi2 = r5_next_bio(wbi, dev->sector); | |
960e739d | 2070 | if (!raid5_dec_bi_phys_segments(wbi)) { |
a4456856 DW |
2071 | md_write_end(conf->mddev); |
2072 | wbi->bi_next = *return_bi; | |
2073 | *return_bi = wbi; | |
2074 | } | |
2075 | wbi = wbi2; | |
2076 | } | |
2077 | if (dev->towrite == NULL) | |
2078 | bitmap_end = 1; | |
2079 | spin_unlock_irq(&conf->device_lock); | |
2080 | if (bitmap_end) | |
2081 | bitmap_endwrite(conf->mddev->bitmap, | |
2082 | sh->sector, | |
2083 | STRIPE_SECTORS, | |
2084 | !test_bit(STRIPE_DEGRADED, &sh->state), | |
2085 | 0); | |
2086 | } | |
2087 | } | |
8b3e6cdc DW |
2088 | |
2089 | if (test_and_clear_bit(STRIPE_FULL_WRITE, &sh->state)) | |
2090 | if (atomic_dec_and_test(&conf->pending_full_writes)) | |
2091 | md_wakeup_thread(conf->mddev->thread); | |
a4456856 DW |
2092 | } |
2093 | ||
1fe797e6 | 2094 | static void handle_stripe_dirtying5(raid5_conf_t *conf, |
a4456856 DW |
2095 | struct stripe_head *sh, struct stripe_head_state *s, int disks) |
2096 | { | |
2097 | int rmw = 0, rcw = 0, i; | |
2098 | for (i = disks; i--; ) { | |
2099 | /* would I have to read this buffer for read_modify_write */ | |
2100 | struct r5dev *dev = &sh->dev[i]; | |
2101 | if ((dev->towrite || i == sh->pd_idx) && | |
2102 | !test_bit(R5_LOCKED, &dev->flags) && | |
f38e1219 DW |
2103 | !(test_bit(R5_UPTODATE, &dev->flags) || |
2104 | test_bit(R5_Wantcompute, &dev->flags))) { | |
a4456856 DW |
2105 | if (test_bit(R5_Insync, &dev->flags)) |
2106 | rmw++; | |
2107 | else | |
2108 | rmw += 2*disks; /* cannot read it */ | |
2109 | } | |
2110 | /* Would I have to read this buffer for reconstruct_write */ | |
2111 | if (!test_bit(R5_OVERWRITE, &dev->flags) && i != sh->pd_idx && | |
2112 | !test_bit(R5_LOCKED, &dev->flags) && | |
f38e1219 DW |
2113 | !(test_bit(R5_UPTODATE, &dev->flags) || |
2114 | test_bit(R5_Wantcompute, &dev->flags))) { | |
2115 | if (test_bit(R5_Insync, &dev->flags)) rcw++; | |
a4456856 DW |
2116 | else |
2117 | rcw += 2*disks; | |
2118 | } | |
2119 | } | |
45b4233c | 2120 | pr_debug("for sector %llu, rmw=%d rcw=%d\n", |
a4456856 DW |
2121 | (unsigned long long)sh->sector, rmw, rcw); |
2122 | set_bit(STRIPE_HANDLE, &sh->state); | |
2123 | if (rmw < rcw && rmw > 0) | |
2124 | /* prefer read-modify-write, but need to get some data */ | |
2125 | for (i = disks; i--; ) { | |
2126 | struct r5dev *dev = &sh->dev[i]; | |
2127 | if ((dev->towrite || i == sh->pd_idx) && | |
2128 | !test_bit(R5_LOCKED, &dev->flags) && | |
f38e1219 DW |
2129 | !(test_bit(R5_UPTODATE, &dev->flags) || |
2130 | test_bit(R5_Wantcompute, &dev->flags)) && | |
a4456856 DW |
2131 | test_bit(R5_Insync, &dev->flags)) { |
2132 | if ( | |
2133 | test_bit(STRIPE_PREREAD_ACTIVE, &sh->state)) { | |
45b4233c | 2134 | pr_debug("Read_old block " |
a4456856 DW |
2135 | "%d for r-m-w\n", i); |
2136 | set_bit(R5_LOCKED, &dev->flags); | |
2137 | set_bit(R5_Wantread, &dev->flags); | |
2138 | s->locked++; | |
2139 | } else { | |
2140 | set_bit(STRIPE_DELAYED, &sh->state); | |
2141 | set_bit(STRIPE_HANDLE, &sh->state); | |
2142 | } | |
2143 | } | |
2144 | } | |
2145 | if (rcw <= rmw && rcw > 0) | |
2146 | /* want reconstruct write, but need to get some data */ | |
2147 | for (i = disks; i--; ) { | |
2148 | struct r5dev *dev = &sh->dev[i]; | |
2149 | if (!test_bit(R5_OVERWRITE, &dev->flags) && | |
2150 | i != sh->pd_idx && | |
2151 | !test_bit(R5_LOCKED, &dev->flags) && | |
f38e1219 DW |
2152 | !(test_bit(R5_UPTODATE, &dev->flags) || |
2153 | test_bit(R5_Wantcompute, &dev->flags)) && | |
a4456856 DW |
2154 | test_bit(R5_Insync, &dev->flags)) { |
2155 | if ( | |
2156 | test_bit(STRIPE_PREREAD_ACTIVE, &sh->state)) { | |
45b4233c | 2157 | pr_debug("Read_old block " |
a4456856 DW |
2158 | "%d for Reconstruct\n", i); |
2159 | set_bit(R5_LOCKED, &dev->flags); | |
2160 | set_bit(R5_Wantread, &dev->flags); | |
2161 | s->locked++; | |
2162 | } else { | |
2163 | set_bit(STRIPE_DELAYED, &sh->state); | |
2164 | set_bit(STRIPE_HANDLE, &sh->state); | |
2165 | } | |
2166 | } | |
2167 | } | |
2168 | /* now if nothing is locked, and if we have enough data, | |
2169 | * we can start a write request | |
2170 | */ | |
f38e1219 DW |
2171 | /* since handle_stripe can be called at any time we need to handle the |
2172 | * case where a compute block operation has been submitted and then a | |
2173 | * subsequent call wants to start a write request. raid5_run_ops only | |
2174 | * handles the case where compute block and postxor are requested | |
2175 | * simultaneously. If this is not the case then new writes need to be | |
2176 | * held off until the compute completes. | |
2177 | */ | |
976ea8d4 DW |
2178 | if ((s->req_compute || !test_bit(STRIPE_COMPUTE_RUN, &sh->state)) && |
2179 | (s->locked == 0 && (rcw == 0 || rmw == 0) && | |
2180 | !test_bit(STRIPE_BIT_DELAY, &sh->state))) | |
1fe797e6 | 2181 | schedule_reconstruction5(sh, s, rcw == 0, 0); |
a4456856 DW |
2182 | } |
2183 | ||
1fe797e6 | 2184 | static void handle_stripe_dirtying6(raid5_conf_t *conf, |
a4456856 DW |
2185 | struct stripe_head *sh, struct stripe_head_state *s, |
2186 | struct r6_state *r6s, int disks) | |
2187 | { | |
2188 | int rcw = 0, must_compute = 0, pd_idx = sh->pd_idx, i; | |
2189 | int qd_idx = r6s->qd_idx; | |
2190 | for (i = disks; i--; ) { | |
2191 | struct r5dev *dev = &sh->dev[i]; | |
2192 | /* Would I have to read this buffer for reconstruct_write */ | |
2193 | if (!test_bit(R5_OVERWRITE, &dev->flags) | |
2194 | && i != pd_idx && i != qd_idx | |
2195 | && (!test_bit(R5_LOCKED, &dev->flags) | |
2196 | ) && | |
2197 | !test_bit(R5_UPTODATE, &dev->flags)) { | |
2198 | if (test_bit(R5_Insync, &dev->flags)) rcw++; | |
2199 | else { | |
45b4233c | 2200 | pr_debug("raid6: must_compute: " |
a4456856 DW |
2201 | "disk %d flags=%#lx\n", i, dev->flags); |
2202 | must_compute++; | |
2203 | } | |
2204 | } | |
2205 | } | |
45b4233c | 2206 | pr_debug("for sector %llu, rcw=%d, must_compute=%d\n", |
a4456856 DW |
2207 | (unsigned long long)sh->sector, rcw, must_compute); |
2208 | set_bit(STRIPE_HANDLE, &sh->state); | |
2209 | ||
2210 | if (rcw > 0) | |
2211 | /* want reconstruct write, but need to get some data */ | |
2212 | for (i = disks; i--; ) { | |
2213 | struct r5dev *dev = &sh->dev[i]; | |
2214 | if (!test_bit(R5_OVERWRITE, &dev->flags) | |
2215 | && !(s->failed == 0 && (i == pd_idx || i == qd_idx)) | |
2216 | && !test_bit(R5_LOCKED, &dev->flags) && | |
2217 | !test_bit(R5_UPTODATE, &dev->flags) && | |
2218 | test_bit(R5_Insync, &dev->flags)) { | |
2219 | if ( | |
2220 | test_bit(STRIPE_PREREAD_ACTIVE, &sh->state)) { | |
45b4233c | 2221 | pr_debug("Read_old stripe %llu " |
a4456856 DW |
2222 | "block %d for Reconstruct\n", |
2223 | (unsigned long long)sh->sector, i); | |
2224 | set_bit(R5_LOCKED, &dev->flags); | |
2225 | set_bit(R5_Wantread, &dev->flags); | |
2226 | s->locked++; | |
2227 | } else { | |
45b4233c | 2228 | pr_debug("Request delayed stripe %llu " |
a4456856 DW |
2229 | "block %d for Reconstruct\n", |
2230 | (unsigned long long)sh->sector, i); | |
2231 | set_bit(STRIPE_DELAYED, &sh->state); | |
2232 | set_bit(STRIPE_HANDLE, &sh->state); | |
2233 | } | |
2234 | } | |
2235 | } | |
2236 | /* now if nothing is locked, and if we have enough data, we can start a | |
2237 | * write request | |
2238 | */ | |
2239 | if (s->locked == 0 && rcw == 0 && | |
2240 | !test_bit(STRIPE_BIT_DELAY, &sh->state)) { | |
2241 | if (must_compute > 0) { | |
2242 | /* We have failed blocks and need to compute them */ | |
2243 | switch (s->failed) { | |
2244 | case 0: | |
2245 | BUG(); | |
2246 | case 1: | |
2247 | compute_block_1(sh, r6s->failed_num[0], 0); | |
2248 | break; | |
2249 | case 2: | |
2250 | compute_block_2(sh, r6s->failed_num[0], | |
2251 | r6s->failed_num[1]); | |
2252 | break; | |
2253 | default: /* This request should have been failed? */ | |
2254 | BUG(); | |
2255 | } | |
2256 | } | |
2257 | ||
45b4233c | 2258 | pr_debug("Computing parity for stripe %llu\n", |
a4456856 DW |
2259 | (unsigned long long)sh->sector); |
2260 | compute_parity6(sh, RECONSTRUCT_WRITE); | |
2261 | /* now every locked buffer is ready to be written */ | |
2262 | for (i = disks; i--; ) | |
2263 | if (test_bit(R5_LOCKED, &sh->dev[i].flags)) { | |
45b4233c | 2264 | pr_debug("Writing stripe %llu block %d\n", |
a4456856 DW |
2265 | (unsigned long long)sh->sector, i); |
2266 | s->locked++; | |
2267 | set_bit(R5_Wantwrite, &sh->dev[i].flags); | |
2268 | } | |
8b3e6cdc DW |
2269 | if (s->locked == disks) |
2270 | if (!test_and_set_bit(STRIPE_FULL_WRITE, &sh->state)) | |
2271 | atomic_inc(&conf->pending_full_writes); | |
a4456856 DW |
2272 | /* after a RECONSTRUCT_WRITE, the stripe MUST be in-sync */ |
2273 | set_bit(STRIPE_INSYNC, &sh->state); | |
2274 | ||
2275 | if (test_and_clear_bit(STRIPE_PREREAD_ACTIVE, &sh->state)) { | |
2276 | atomic_dec(&conf->preread_active_stripes); | |
2277 | if (atomic_read(&conf->preread_active_stripes) < | |
2278 | IO_THRESHOLD) | |
2279 | md_wakeup_thread(conf->mddev->thread); | |
2280 | } | |
2281 | } | |
2282 | } | |
2283 | ||
2284 | static void handle_parity_checks5(raid5_conf_t *conf, struct stripe_head *sh, | |
2285 | struct stripe_head_state *s, int disks) | |
2286 | { | |
ecc65c9b | 2287 | struct r5dev *dev = NULL; |
bd2ab670 | 2288 | |
a4456856 | 2289 | set_bit(STRIPE_HANDLE, &sh->state); |
e89f8962 | 2290 | |
ecc65c9b DW |
2291 | switch (sh->check_state) { |
2292 | case check_state_idle: | |
2293 | /* start a new check operation if there are no failures */ | |
bd2ab670 | 2294 | if (s->failed == 0) { |
bd2ab670 | 2295 | BUG_ON(s->uptodate != disks); |
ecc65c9b DW |
2296 | sh->check_state = check_state_run; |
2297 | set_bit(STRIPE_OP_CHECK, &s->ops_request); | |
bd2ab670 | 2298 | clear_bit(R5_UPTODATE, &sh->dev[sh->pd_idx].flags); |
bd2ab670 | 2299 | s->uptodate--; |
ecc65c9b | 2300 | break; |
bd2ab670 | 2301 | } |
ecc65c9b DW |
2302 | dev = &sh->dev[s->failed_num]; |
2303 | /* fall through */ | |
2304 | case check_state_compute_result: | |
2305 | sh->check_state = check_state_idle; | |
2306 | if (!dev) | |
2307 | dev = &sh->dev[sh->pd_idx]; | |
2308 | ||
2309 | /* check that a write has not made the stripe insync */ | |
2310 | if (test_bit(STRIPE_INSYNC, &sh->state)) | |
2311 | break; | |
c8894419 | 2312 | |
a4456856 | 2313 | /* either failed parity check, or recovery is happening */ |
a4456856 DW |
2314 | BUG_ON(!test_bit(R5_UPTODATE, &dev->flags)); |
2315 | BUG_ON(s->uptodate != disks); | |
2316 | ||
2317 | set_bit(R5_LOCKED, &dev->flags); | |
ecc65c9b | 2318 | s->locked++; |
a4456856 | 2319 | set_bit(R5_Wantwrite, &dev->flags); |
830ea016 | 2320 | |
a4456856 | 2321 | clear_bit(STRIPE_DEGRADED, &sh->state); |
a4456856 | 2322 | set_bit(STRIPE_INSYNC, &sh->state); |
ecc65c9b DW |
2323 | break; |
2324 | case check_state_run: | |
2325 | break; /* we will be called again upon completion */ | |
2326 | case check_state_check_result: | |
2327 | sh->check_state = check_state_idle; | |
2328 | ||
2329 | /* if a failure occurred during the check operation, leave | |
2330 | * STRIPE_INSYNC not set and let the stripe be handled again | |
2331 | */ | |
2332 | if (s->failed) | |
2333 | break; | |
2334 | ||
2335 | /* handle a successful check operation, if parity is correct | |
2336 | * we are done. Otherwise update the mismatch count and repair | |
2337 | * parity if !MD_RECOVERY_CHECK | |
2338 | */ | |
2339 | if (sh->ops.zero_sum_result == 0) | |
2340 | /* parity is correct (on disc, | |
2341 | * not in buffer any more) | |
2342 | */ | |
2343 | set_bit(STRIPE_INSYNC, &sh->state); | |
2344 | else { | |
2345 | conf->mddev->resync_mismatches += STRIPE_SECTORS; | |
2346 | if (test_bit(MD_RECOVERY_CHECK, &conf->mddev->recovery)) | |
2347 | /* don't try to repair!! */ | |
2348 | set_bit(STRIPE_INSYNC, &sh->state); | |
2349 | else { | |
2350 | sh->check_state = check_state_compute_run; | |
976ea8d4 | 2351 | set_bit(STRIPE_COMPUTE_RUN, &sh->state); |
ecc65c9b DW |
2352 | set_bit(STRIPE_OP_COMPUTE_BLK, &s->ops_request); |
2353 | set_bit(R5_Wantcompute, | |
2354 | &sh->dev[sh->pd_idx].flags); | |
2355 | sh->ops.target = sh->pd_idx; | |
2356 | s->uptodate++; | |
2357 | } | |
2358 | } | |
2359 | break; | |
2360 | case check_state_compute_run: | |
2361 | break; | |
2362 | default: | |
2363 | printk(KERN_ERR "%s: unknown check_state: %d sector: %llu\n", | |
2364 | __func__, sh->check_state, | |
2365 | (unsigned long long) sh->sector); | |
2366 | BUG(); | |
a4456856 DW |
2367 | } |
2368 | } | |
2369 | ||
2370 | ||
2371 | static void handle_parity_checks6(raid5_conf_t *conf, struct stripe_head *sh, | |
2372 | struct stripe_head_state *s, | |
2373 | struct r6_state *r6s, struct page *tmp_page, | |
2374 | int disks) | |
2375 | { | |
2376 | int update_p = 0, update_q = 0; | |
2377 | struct r5dev *dev; | |
2378 | int pd_idx = sh->pd_idx; | |
2379 | int qd_idx = r6s->qd_idx; | |
2380 | ||
2381 | set_bit(STRIPE_HANDLE, &sh->state); | |
2382 | ||
2383 | BUG_ON(s->failed > 2); | |
2384 | BUG_ON(s->uptodate < disks); | |
2385 | /* Want to check and possibly repair P and Q. | |
2386 | * However there could be one 'failed' device, in which | |
2387 | * case we can only check one of them, possibly using the | |
2388 | * other to generate missing data | |
2389 | */ | |
2390 | ||
2391 | /* If !tmp_page, we cannot do the calculations, | |
2392 | * but as we have set STRIPE_HANDLE, we will soon be called | |
2393 | * by stripe_handle with a tmp_page - just wait until then. | |
2394 | */ | |
2395 | if (tmp_page) { | |
2396 | if (s->failed == r6s->q_failed) { | |
2397 | /* The only possible failed device holds 'Q', so it | |
2398 | * makes sense to check P (If anything else were failed, | |
2399 | * we would have used P to recreate it). | |
2400 | */ | |
2401 | compute_block_1(sh, pd_idx, 1); | |
2402 | if (!page_is_zero(sh->dev[pd_idx].page)) { | |
2403 | compute_block_1(sh, pd_idx, 0); | |
2404 | update_p = 1; | |
2405 | } | |
2406 | } | |
2407 | if (!r6s->q_failed && s->failed < 2) { | |
2408 | /* q is not failed, and we didn't use it to generate | |
2409 | * anything, so it makes sense to check it | |
2410 | */ | |
2411 | memcpy(page_address(tmp_page), | |
2412 | page_address(sh->dev[qd_idx].page), | |
2413 | STRIPE_SIZE); | |
2414 | compute_parity6(sh, UPDATE_PARITY); | |
2415 | if (memcmp(page_address(tmp_page), | |
2416 | page_address(sh->dev[qd_idx].page), | |
2417 | STRIPE_SIZE) != 0) { | |
2418 | clear_bit(STRIPE_INSYNC, &sh->state); | |
2419 | update_q = 1; | |
2420 | } | |
2421 | } | |
2422 | if (update_p || update_q) { | |
2423 | conf->mddev->resync_mismatches += STRIPE_SECTORS; | |
2424 | if (test_bit(MD_RECOVERY_CHECK, &conf->mddev->recovery)) | |
2425 | /* don't try to repair!! */ | |
2426 | update_p = update_q = 0; | |
2427 | } | |
2428 | ||
2429 | /* now write out any block on a failed drive, | |
2430 | * or P or Q if they need it | |
2431 | */ | |
2432 | ||
2433 | if (s->failed == 2) { | |
2434 | dev = &sh->dev[r6s->failed_num[1]]; | |
2435 | s->locked++; | |
2436 | set_bit(R5_LOCKED, &dev->flags); | |
2437 | set_bit(R5_Wantwrite, &dev->flags); | |
2438 | } | |
2439 | if (s->failed >= 1) { | |
2440 | dev = &sh->dev[r6s->failed_num[0]]; | |
2441 | s->locked++; | |
2442 | set_bit(R5_LOCKED, &dev->flags); | |
2443 | set_bit(R5_Wantwrite, &dev->flags); | |
2444 | } | |
2445 | ||
2446 | if (update_p) { | |
2447 | dev = &sh->dev[pd_idx]; | |
2448 | s->locked++; | |
2449 | set_bit(R5_LOCKED, &dev->flags); | |
2450 | set_bit(R5_Wantwrite, &dev->flags); | |
2451 | } | |
2452 | if (update_q) { | |
2453 | dev = &sh->dev[qd_idx]; | |
2454 | s->locked++; | |
2455 | set_bit(R5_LOCKED, &dev->flags); | |
2456 | set_bit(R5_Wantwrite, &dev->flags); | |
2457 | } | |
2458 | clear_bit(STRIPE_DEGRADED, &sh->state); | |
2459 | ||
2460 | set_bit(STRIPE_INSYNC, &sh->state); | |
2461 | } | |
2462 | } | |
2463 | ||
2464 | static void handle_stripe_expansion(raid5_conf_t *conf, struct stripe_head *sh, | |
2465 | struct r6_state *r6s) | |
2466 | { | |
2467 | int i; | |
2468 | ||
2469 | /* We have read all the blocks in this stripe and now we need to | |
2470 | * copy some of them into a target stripe for expand. | |
2471 | */ | |
f0a50d37 | 2472 | struct dma_async_tx_descriptor *tx = NULL; |
a4456856 DW |
2473 | clear_bit(STRIPE_EXPAND_SOURCE, &sh->state); |
2474 | for (i = 0; i < sh->disks; i++) | |
a2e08551 | 2475 | if (i != sh->pd_idx && (!r6s || i != r6s->qd_idx)) { |
a4456856 DW |
2476 | int dd_idx, pd_idx, j; |
2477 | struct stripe_head *sh2; | |
2478 | ||
2479 | sector_t bn = compute_blocknr(sh, i); | |
2480 | sector_t s = raid5_compute_sector(bn, conf->raid_disks, | |
2481 | conf->raid_disks - | |
2482 | conf->max_degraded, &dd_idx, | |
2483 | &pd_idx, conf); | |
2484 | sh2 = get_active_stripe(conf, s, conf->raid_disks, | |
2485 | pd_idx, 1); | |
2486 | if (sh2 == NULL) | |
2487 | /* so far only the early blocks of this stripe | |
2488 | * have been requested. When later blocks | |
2489 | * get requested, we will try again | |
2490 | */ | |
2491 | continue; | |
2492 | if (!test_bit(STRIPE_EXPANDING, &sh2->state) || | |
2493 | test_bit(R5_Expanded, &sh2->dev[dd_idx].flags)) { | |
2494 | /* must have already done this block */ | |
2495 | release_stripe(sh2); | |
2496 | continue; | |
2497 | } | |
f0a50d37 DW |
2498 | |
2499 | /* place all the copies on one channel */ | |
2500 | tx = async_memcpy(sh2->dev[dd_idx].page, | |
2501 | sh->dev[i].page, 0, 0, STRIPE_SIZE, | |
2502 | ASYNC_TX_DEP_ACK, tx, NULL, NULL); | |
2503 | ||
a4456856 DW |
2504 | set_bit(R5_Expanded, &sh2->dev[dd_idx].flags); |
2505 | set_bit(R5_UPTODATE, &sh2->dev[dd_idx].flags); | |
2506 | for (j = 0; j < conf->raid_disks; j++) | |
2507 | if (j != sh2->pd_idx && | |
a2e08551 N |
2508 | (!r6s || j != raid6_next_disk(sh2->pd_idx, |
2509 | sh2->disks)) && | |
a4456856 DW |
2510 | !test_bit(R5_Expanded, &sh2->dev[j].flags)) |
2511 | break; | |
2512 | if (j == conf->raid_disks) { | |
2513 | set_bit(STRIPE_EXPAND_READY, &sh2->state); | |
2514 | set_bit(STRIPE_HANDLE, &sh2->state); | |
2515 | } | |
2516 | release_stripe(sh2); | |
f0a50d37 | 2517 | |
a4456856 | 2518 | } |
a2e08551 N |
2519 | /* done submitting copies, wait for them to complete */ |
2520 | if (tx) { | |
2521 | async_tx_ack(tx); | |
2522 | dma_wait_for_async_tx(tx); | |
2523 | } | |
a4456856 | 2524 | } |
1da177e4 | 2525 | |
6bfe0b49 | 2526 | |
1da177e4 LT |
2527 | /* |
2528 | * handle_stripe - do things to a stripe. | |
2529 | * | |
2530 | * We lock the stripe and then examine the state of various bits | |
2531 | * to see what needs to be done. | |
2532 | * Possible results: | |
2533 | * return some read request which now have data | |
2534 | * return some write requests which are safely on disc | |
2535 | * schedule a read on some buffers | |
2536 | * schedule a write of some buffers | |
2537 | * return confirmation of parity correctness | |
2538 | * | |
1da177e4 LT |
2539 | * buffers are taken off read_list or write_list, and bh_cache buffers |
2540 | * get BH_Lock set before the stripe lock is released. | |
2541 | * | |
2542 | */ | |
a4456856 | 2543 | |
df10cfbc | 2544 | static bool handle_stripe5(struct stripe_head *sh) |
1da177e4 LT |
2545 | { |
2546 | raid5_conf_t *conf = sh->raid_conf; | |
a4456856 DW |
2547 | int disks = sh->disks, i; |
2548 | struct bio *return_bi = NULL; | |
2549 | struct stripe_head_state s; | |
1da177e4 | 2550 | struct r5dev *dev; |
6bfe0b49 | 2551 | mdk_rdev_t *blocked_rdev = NULL; |
e0a115e5 | 2552 | int prexor; |
1da177e4 | 2553 | |
a4456856 | 2554 | memset(&s, 0, sizeof(s)); |
600aa109 DW |
2555 | pr_debug("handling stripe %llu, state=%#lx cnt=%d, pd_idx=%d check:%d " |
2556 | "reconstruct:%d\n", (unsigned long long)sh->sector, sh->state, | |
2557 | atomic_read(&sh->count), sh->pd_idx, sh->check_state, | |
2558 | sh->reconstruct_state); | |
1da177e4 LT |
2559 | |
2560 | spin_lock(&sh->lock); | |
2561 | clear_bit(STRIPE_HANDLE, &sh->state); | |
2562 | clear_bit(STRIPE_DELAYED, &sh->state); | |
2563 | ||
a4456856 DW |
2564 | s.syncing = test_bit(STRIPE_SYNCING, &sh->state); |
2565 | s.expanding = test_bit(STRIPE_EXPAND_SOURCE, &sh->state); | |
2566 | s.expanded = test_bit(STRIPE_EXPAND_READY, &sh->state); | |
def6ae26 | 2567 | |
83de75cc | 2568 | /* Now to look around and see what can be done */ |
9910f16a | 2569 | rcu_read_lock(); |
1da177e4 LT |
2570 | for (i=disks; i--; ) { |
2571 | mdk_rdev_t *rdev; | |
a4456856 | 2572 | struct r5dev *dev = &sh->dev[i]; |
1da177e4 | 2573 | clear_bit(R5_Insync, &dev->flags); |
1da177e4 | 2574 | |
b5e98d65 DW |
2575 | pr_debug("check %d: state 0x%lx toread %p read %p write %p " |
2576 | "written %p\n", i, dev->flags, dev->toread, dev->read, | |
2577 | dev->towrite, dev->written); | |
2578 | ||
2579 | /* maybe we can request a biofill operation | |
2580 | * | |
2581 | * new wantfill requests are only permitted while | |
83de75cc | 2582 | * ops_complete_biofill is guaranteed to be inactive |
b5e98d65 DW |
2583 | */ |
2584 | if (test_bit(R5_UPTODATE, &dev->flags) && dev->toread && | |
83de75cc | 2585 | !test_bit(STRIPE_BIOFILL_RUN, &sh->state)) |
b5e98d65 | 2586 | set_bit(R5_Wantfill, &dev->flags); |
1da177e4 LT |
2587 | |
2588 | /* now count some things */ | |
a4456856 DW |
2589 | if (test_bit(R5_LOCKED, &dev->flags)) s.locked++; |
2590 | if (test_bit(R5_UPTODATE, &dev->flags)) s.uptodate++; | |
f38e1219 | 2591 | if (test_bit(R5_Wantcompute, &dev->flags)) s.compute++; |
1da177e4 | 2592 | |
b5e98d65 DW |
2593 | if (test_bit(R5_Wantfill, &dev->flags)) |
2594 | s.to_fill++; | |
2595 | else if (dev->toread) | |
a4456856 | 2596 | s.to_read++; |
1da177e4 | 2597 | if (dev->towrite) { |
a4456856 | 2598 | s.to_write++; |
1da177e4 | 2599 | if (!test_bit(R5_OVERWRITE, &dev->flags)) |
a4456856 | 2600 | s.non_overwrite++; |
1da177e4 | 2601 | } |
a4456856 DW |
2602 | if (dev->written) |
2603 | s.written++; | |
9910f16a | 2604 | rdev = rcu_dereference(conf->disks[i].rdev); |
ac4090d2 N |
2605 | if (blocked_rdev == NULL && |
2606 | rdev && unlikely(test_bit(Blocked, &rdev->flags))) { | |
6bfe0b49 DW |
2607 | blocked_rdev = rdev; |
2608 | atomic_inc(&rdev->nr_pending); | |
6bfe0b49 | 2609 | } |
b2d444d7 | 2610 | if (!rdev || !test_bit(In_sync, &rdev->flags)) { |
14f8d26b | 2611 | /* The ReadError flag will just be confusing now */ |
4e5314b5 N |
2612 | clear_bit(R5_ReadError, &dev->flags); |
2613 | clear_bit(R5_ReWrite, &dev->flags); | |
2614 | } | |
b2d444d7 | 2615 | if (!rdev || !test_bit(In_sync, &rdev->flags) |
4e5314b5 | 2616 | || test_bit(R5_ReadError, &dev->flags)) { |
a4456856 DW |
2617 | s.failed++; |
2618 | s.failed_num = i; | |
1da177e4 LT |
2619 | } else |
2620 | set_bit(R5_Insync, &dev->flags); | |
2621 | } | |
9910f16a | 2622 | rcu_read_unlock(); |
b5e98d65 | 2623 | |
6bfe0b49 | 2624 | if (unlikely(blocked_rdev)) { |
ac4090d2 N |
2625 | if (s.syncing || s.expanding || s.expanded || |
2626 | s.to_write || s.written) { | |
2627 | set_bit(STRIPE_HANDLE, &sh->state); | |
2628 | goto unlock; | |
2629 | } | |
2630 | /* There is nothing for the blocked_rdev to block */ | |
2631 | rdev_dec_pending(blocked_rdev, conf->mddev); | |
2632 | blocked_rdev = NULL; | |
6bfe0b49 DW |
2633 | } |
2634 | ||
83de75cc DW |
2635 | if (s.to_fill && !test_bit(STRIPE_BIOFILL_RUN, &sh->state)) { |
2636 | set_bit(STRIPE_OP_BIOFILL, &s.ops_request); | |
2637 | set_bit(STRIPE_BIOFILL_RUN, &sh->state); | |
2638 | } | |
b5e98d65 | 2639 | |
45b4233c | 2640 | pr_debug("locked=%d uptodate=%d to_read=%d" |
1da177e4 | 2641 | " to_write=%d failed=%d failed_num=%d\n", |
a4456856 DW |
2642 | s.locked, s.uptodate, s.to_read, s.to_write, |
2643 | s.failed, s.failed_num); | |
1da177e4 LT |
2644 | /* check if the array has lost two devices and, if so, some requests might |
2645 | * need to be failed | |
2646 | */ | |
a4456856 | 2647 | if (s.failed > 1 && s.to_read+s.to_write+s.written) |
1fe797e6 | 2648 | handle_failed_stripe(conf, sh, &s, disks, &return_bi); |
a4456856 | 2649 | if (s.failed > 1 && s.syncing) { |
1da177e4 LT |
2650 | md_done_sync(conf->mddev, STRIPE_SECTORS,0); |
2651 | clear_bit(STRIPE_SYNCING, &sh->state); | |
a4456856 | 2652 | s.syncing = 0; |
1da177e4 LT |
2653 | } |
2654 | ||
2655 | /* might be able to return some write requests if the parity block | |
2656 | * is safe, or on a failed drive | |
2657 | */ | |
2658 | dev = &sh->dev[sh->pd_idx]; | |
a4456856 DW |
2659 | if ( s.written && |
2660 | ((test_bit(R5_Insync, &dev->flags) && | |
2661 | !test_bit(R5_LOCKED, &dev->flags) && | |
2662 | test_bit(R5_UPTODATE, &dev->flags)) || | |
2663 | (s.failed == 1 && s.failed_num == sh->pd_idx))) | |
1fe797e6 | 2664 | handle_stripe_clean_event(conf, sh, disks, &return_bi); |
1da177e4 LT |
2665 | |
2666 | /* Now we might consider reading some blocks, either to check/generate | |
2667 | * parity, or to satisfy requests | |
2668 | * or to load a block that is being partially written. | |
2669 | */ | |
a4456856 | 2670 | if (s.to_read || s.non_overwrite || |
976ea8d4 | 2671 | (s.syncing && (s.uptodate + s.compute < disks)) || s.expanding) |
1fe797e6 | 2672 | handle_stripe_fill5(sh, &s, disks); |
1da177e4 | 2673 | |
e33129d8 DW |
2674 | /* Now we check to see if any write operations have recently |
2675 | * completed | |
2676 | */ | |
e0a115e5 | 2677 | prexor = 0; |
d8ee0728 | 2678 | if (sh->reconstruct_state == reconstruct_state_prexor_drain_result) |
e0a115e5 | 2679 | prexor = 1; |
d8ee0728 DW |
2680 | if (sh->reconstruct_state == reconstruct_state_drain_result || |
2681 | sh->reconstruct_state == reconstruct_state_prexor_drain_result) { | |
600aa109 | 2682 | sh->reconstruct_state = reconstruct_state_idle; |
e33129d8 DW |
2683 | |
2684 | /* All the 'written' buffers and the parity block are ready to | |
2685 | * be written back to disk | |
2686 | */ | |
2687 | BUG_ON(!test_bit(R5_UPTODATE, &sh->dev[sh->pd_idx].flags)); | |
2688 | for (i = disks; i--; ) { | |
2689 | dev = &sh->dev[i]; | |
2690 | if (test_bit(R5_LOCKED, &dev->flags) && | |
2691 | (i == sh->pd_idx || dev->written)) { | |
2692 | pr_debug("Writing block %d\n", i); | |
2693 | set_bit(R5_Wantwrite, &dev->flags); | |
e0a115e5 DW |
2694 | if (prexor) |
2695 | continue; | |
e33129d8 DW |
2696 | if (!test_bit(R5_Insync, &dev->flags) || |
2697 | (i == sh->pd_idx && s.failed == 0)) | |
2698 | set_bit(STRIPE_INSYNC, &sh->state); | |
2699 | } | |
2700 | } | |
2701 | if (test_and_clear_bit(STRIPE_PREREAD_ACTIVE, &sh->state)) { | |
2702 | atomic_dec(&conf->preread_active_stripes); | |
2703 | if (atomic_read(&conf->preread_active_stripes) < | |
2704 | IO_THRESHOLD) | |
2705 | md_wakeup_thread(conf->mddev->thread); | |
2706 | } | |
2707 | } | |
2708 | ||
2709 | /* Now to consider new write requests and what else, if anything | |
2710 | * should be read. We do not handle new writes when: | |
2711 | * 1/ A 'write' operation (copy+xor) is already in flight. | |
2712 | * 2/ A 'check' operation is in flight, as it may clobber the parity | |
2713 | * block. | |
2714 | */ | |
600aa109 | 2715 | if (s.to_write && !sh->reconstruct_state && !sh->check_state) |
1fe797e6 | 2716 | handle_stripe_dirtying5(conf, sh, &s, disks); |
1da177e4 LT |
2717 | |
2718 | /* maybe we need to check and possibly fix the parity for this stripe | |
e89f8962 DW |
2719 | * Any reads will already have been scheduled, so we just see if enough |
2720 | * data is available. The parity check is held off while parity | |
2721 | * dependent operations are in flight. | |
1da177e4 | 2722 | */ |
ecc65c9b DW |
2723 | if (sh->check_state || |
2724 | (s.syncing && s.locked == 0 && | |
976ea8d4 | 2725 | !test_bit(STRIPE_COMPUTE_RUN, &sh->state) && |
ecc65c9b | 2726 | !test_bit(STRIPE_INSYNC, &sh->state))) |
a4456856 | 2727 | handle_parity_checks5(conf, sh, &s, disks); |
e89f8962 | 2728 | |
a4456856 | 2729 | if (s.syncing && s.locked == 0 && test_bit(STRIPE_INSYNC, &sh->state)) { |
1da177e4 LT |
2730 | md_done_sync(conf->mddev, STRIPE_SECTORS,1); |
2731 | clear_bit(STRIPE_SYNCING, &sh->state); | |
2732 | } | |
4e5314b5 N |
2733 | |
2734 | /* If the failed drive is just a ReadError, then we might need to progress | |
2735 | * the repair/check process | |
2736 | */ | |
a4456856 DW |
2737 | if (s.failed == 1 && !conf->mddev->ro && |
2738 | test_bit(R5_ReadError, &sh->dev[s.failed_num].flags) | |
2739 | && !test_bit(R5_LOCKED, &sh->dev[s.failed_num].flags) | |
2740 | && test_bit(R5_UPTODATE, &sh->dev[s.failed_num].flags) | |
4e5314b5 | 2741 | ) { |
a4456856 | 2742 | dev = &sh->dev[s.failed_num]; |
4e5314b5 N |
2743 | if (!test_bit(R5_ReWrite, &dev->flags)) { |
2744 | set_bit(R5_Wantwrite, &dev->flags); | |
2745 | set_bit(R5_ReWrite, &dev->flags); | |
2746 | set_bit(R5_LOCKED, &dev->flags); | |
a4456856 | 2747 | s.locked++; |
4e5314b5 N |
2748 | } else { |
2749 | /* let's read it back */ | |
2750 | set_bit(R5_Wantread, &dev->flags); | |
2751 | set_bit(R5_LOCKED, &dev->flags); | |
a4456856 | 2752 | s.locked++; |
4e5314b5 N |
2753 | } |
2754 | } | |
2755 | ||
600aa109 DW |
2756 | /* Finish reconstruct operations initiated by the expansion process */ |
2757 | if (sh->reconstruct_state == reconstruct_state_result) { | |
2758 | sh->reconstruct_state = reconstruct_state_idle; | |
f0a50d37 | 2759 | clear_bit(STRIPE_EXPANDING, &sh->state); |
23397883 | 2760 | for (i = conf->raid_disks; i--; ) { |
ccfcc3c1 | 2761 | set_bit(R5_Wantwrite, &sh->dev[i].flags); |
23397883 | 2762 | set_bit(R5_LOCKED, &sh->dev[i].flags); |
efe31143 | 2763 | s.locked++; |
23397883 | 2764 | } |
f0a50d37 DW |
2765 | } |
2766 | ||
2767 | if (s.expanded && test_bit(STRIPE_EXPANDING, &sh->state) && | |
600aa109 | 2768 | !sh->reconstruct_state) { |
f0a50d37 DW |
2769 | /* Need to write out all blocks after computing parity */ |
2770 | sh->disks = conf->raid_disks; | |
2771 | sh->pd_idx = stripe_to_pdidx(sh->sector, conf, | |
2772 | conf->raid_disks); | |
1fe797e6 | 2773 | schedule_reconstruction5(sh, &s, 1, 1); |
600aa109 | 2774 | } else if (s.expanded && !sh->reconstruct_state && s.locked == 0) { |
ccfcc3c1 | 2775 | clear_bit(STRIPE_EXPAND_READY, &sh->state); |
f6705578 | 2776 | atomic_dec(&conf->reshape_stripes); |
ccfcc3c1 N |
2777 | wake_up(&conf->wait_for_overlap); |
2778 | md_done_sync(conf->mddev, STRIPE_SECTORS, 1); | |
2779 | } | |
2780 | ||
0f94e87c | 2781 | if (s.expanding && s.locked == 0 && |
976ea8d4 | 2782 | !test_bit(STRIPE_COMPUTE_RUN, &sh->state)) |
a4456856 | 2783 | handle_stripe_expansion(conf, sh, NULL); |
ccfcc3c1 | 2784 | |
6bfe0b49 | 2785 | unlock: |
1da177e4 LT |
2786 | spin_unlock(&sh->lock); |
2787 | ||
6bfe0b49 DW |
2788 | /* wait for this device to become unblocked */ |
2789 | if (unlikely(blocked_rdev)) | |
2790 | md_wait_for_blocked_rdev(blocked_rdev, conf->mddev); | |
2791 | ||
600aa109 DW |
2792 | if (s.ops_request) |
2793 | raid5_run_ops(sh, s.ops_request); | |
d84e0f10 | 2794 | |
c4e5ac0a | 2795 | ops_run_io(sh, &s); |
1da177e4 | 2796 | |
a4456856 | 2797 | return_io(return_bi); |
df10cfbc DW |
2798 | |
2799 | return blocked_rdev == NULL; | |
1da177e4 LT |
2800 | } |
2801 | ||
df10cfbc | 2802 | static bool handle_stripe6(struct stripe_head *sh, struct page *tmp_page) |
1da177e4 | 2803 | { |
16a53ecc | 2804 | raid6_conf_t *conf = sh->raid_conf; |
f416885e | 2805 | int disks = sh->disks; |
a4456856 DW |
2806 | struct bio *return_bi = NULL; |
2807 | int i, pd_idx = sh->pd_idx; | |
2808 | struct stripe_head_state s; | |
2809 | struct r6_state r6s; | |
16a53ecc | 2810 | struct r5dev *dev, *pdev, *qdev; |
6bfe0b49 | 2811 | mdk_rdev_t *blocked_rdev = NULL; |
1da177e4 | 2812 | |
a4456856 | 2813 | r6s.qd_idx = raid6_next_disk(pd_idx, disks); |
45b4233c | 2814 | pr_debug("handling stripe %llu, state=%#lx cnt=%d, " |
a4456856 DW |
2815 | "pd_idx=%d, qd_idx=%d\n", |
2816 | (unsigned long long)sh->sector, sh->state, | |
2817 | atomic_read(&sh->count), pd_idx, r6s.qd_idx); | |
2818 | memset(&s, 0, sizeof(s)); | |
72626685 | 2819 | |
16a53ecc N |
2820 | spin_lock(&sh->lock); |
2821 | clear_bit(STRIPE_HANDLE, &sh->state); | |
2822 | clear_bit(STRIPE_DELAYED, &sh->state); | |
2823 | ||
a4456856 DW |
2824 | s.syncing = test_bit(STRIPE_SYNCING, &sh->state); |
2825 | s.expanding = test_bit(STRIPE_EXPAND_SOURCE, &sh->state); | |
2826 | s.expanded = test_bit(STRIPE_EXPAND_READY, &sh->state); | |
16a53ecc | 2827 | /* Now to look around and see what can be done */ |
1da177e4 LT |
2828 | |
2829 | rcu_read_lock(); | |
16a53ecc N |
2830 | for (i=disks; i--; ) { |
2831 | mdk_rdev_t *rdev; | |
2832 | dev = &sh->dev[i]; | |
2833 | clear_bit(R5_Insync, &dev->flags); | |
1da177e4 | 2834 | |
45b4233c | 2835 | pr_debug("check %d: state 0x%lx read %p write %p written %p\n", |
16a53ecc N |
2836 | i, dev->flags, dev->toread, dev->towrite, dev->written); |
2837 | /* maybe we can reply to a read */ | |
2838 | if (test_bit(R5_UPTODATE, &dev->flags) && dev->toread) { | |
2839 | struct bio *rbi, *rbi2; | |
45b4233c | 2840 | pr_debug("Return read for disc %d\n", i); |
16a53ecc N |
2841 | spin_lock_irq(&conf->device_lock); |
2842 | rbi = dev->toread; | |
2843 | dev->toread = NULL; | |
2844 | if (test_and_clear_bit(R5_Overlap, &dev->flags)) | |
2845 | wake_up(&conf->wait_for_overlap); | |
2846 | spin_unlock_irq(&conf->device_lock); | |
2847 | while (rbi && rbi->bi_sector < dev->sector + STRIPE_SECTORS) { | |
2848 | copy_data(0, rbi, dev->page, dev->sector); | |
2849 | rbi2 = r5_next_bio(rbi, dev->sector); | |
2850 | spin_lock_irq(&conf->device_lock); | |
960e739d | 2851 | if (!raid5_dec_bi_phys_segments(rbi)) { |
16a53ecc N |
2852 | rbi->bi_next = return_bi; |
2853 | return_bi = rbi; | |
2854 | } | |
2855 | spin_unlock_irq(&conf->device_lock); | |
2856 | rbi = rbi2; | |
2857 | } | |
2858 | } | |
1da177e4 | 2859 | |
16a53ecc | 2860 | /* now count some things */ |
a4456856 DW |
2861 | if (test_bit(R5_LOCKED, &dev->flags)) s.locked++; |
2862 | if (test_bit(R5_UPTODATE, &dev->flags)) s.uptodate++; | |
1da177e4 | 2863 | |
16a53ecc | 2864 | |
a4456856 DW |
2865 | if (dev->toread) |
2866 | s.to_read++; | |
16a53ecc | 2867 | if (dev->towrite) { |
a4456856 | 2868 | s.to_write++; |
16a53ecc | 2869 | if (!test_bit(R5_OVERWRITE, &dev->flags)) |
a4456856 | 2870 | s.non_overwrite++; |
16a53ecc | 2871 | } |
a4456856 DW |
2872 | if (dev->written) |
2873 | s.written++; | |
16a53ecc | 2874 | rdev = rcu_dereference(conf->disks[i].rdev); |
ac4090d2 N |
2875 | if (blocked_rdev == NULL && |
2876 | rdev && unlikely(test_bit(Blocked, &rdev->flags))) { | |
6bfe0b49 DW |
2877 | blocked_rdev = rdev; |
2878 | atomic_inc(&rdev->nr_pending); | |
6bfe0b49 | 2879 | } |
16a53ecc N |
2880 | if (!rdev || !test_bit(In_sync, &rdev->flags)) { |
2881 | /* The ReadError flag will just be confusing now */ | |
2882 | clear_bit(R5_ReadError, &dev->flags); | |
2883 | clear_bit(R5_ReWrite, &dev->flags); | |
1da177e4 | 2884 | } |
16a53ecc N |
2885 | if (!rdev || !test_bit(In_sync, &rdev->flags) |
2886 | || test_bit(R5_ReadError, &dev->flags)) { | |
a4456856 DW |
2887 | if (s.failed < 2) |
2888 | r6s.failed_num[s.failed] = i; | |
2889 | s.failed++; | |
16a53ecc N |
2890 | } else |
2891 | set_bit(R5_Insync, &dev->flags); | |
1da177e4 LT |
2892 | } |
2893 | rcu_read_unlock(); | |
6bfe0b49 DW |
2894 | |
2895 | if (unlikely(blocked_rdev)) { | |
ac4090d2 N |
2896 | if (s.syncing || s.expanding || s.expanded || |
2897 | s.to_write || s.written) { | |
2898 | set_bit(STRIPE_HANDLE, &sh->state); | |
2899 | goto unlock; | |
2900 | } | |
2901 | /* There is nothing for the blocked_rdev to block */ | |
2902 | rdev_dec_pending(blocked_rdev, conf->mddev); | |
2903 | blocked_rdev = NULL; | |
6bfe0b49 | 2904 | } |
ac4090d2 | 2905 | |
45b4233c | 2906 | pr_debug("locked=%d uptodate=%d to_read=%d" |
16a53ecc | 2907 | " to_write=%d failed=%d failed_num=%d,%d\n", |
a4456856 DW |
2908 | s.locked, s.uptodate, s.to_read, s.to_write, s.failed, |
2909 | r6s.failed_num[0], r6s.failed_num[1]); | |
2910 | /* check if the array has lost >2 devices and, if so, some requests | |
2911 | * might need to be failed | |
16a53ecc | 2912 | */ |
a4456856 | 2913 | if (s.failed > 2 && s.to_read+s.to_write+s.written) |
1fe797e6 | 2914 | handle_failed_stripe(conf, sh, &s, disks, &return_bi); |
a4456856 | 2915 | if (s.failed > 2 && s.syncing) { |
16a53ecc N |
2916 | md_done_sync(conf->mddev, STRIPE_SECTORS,0); |
2917 | clear_bit(STRIPE_SYNCING, &sh->state); | |
a4456856 | 2918 | s.syncing = 0; |
16a53ecc N |
2919 | } |
2920 | ||
2921 | /* | |
2922 | * might be able to return some write requests if the parity blocks | |
2923 | * are safe, or on a failed drive | |
2924 | */ | |
2925 | pdev = &sh->dev[pd_idx]; | |
a4456856 DW |
2926 | r6s.p_failed = (s.failed >= 1 && r6s.failed_num[0] == pd_idx) |
2927 | || (s.failed >= 2 && r6s.failed_num[1] == pd_idx); | |
2928 | qdev = &sh->dev[r6s.qd_idx]; | |
2929 | r6s.q_failed = (s.failed >= 1 && r6s.failed_num[0] == r6s.qd_idx) | |
2930 | || (s.failed >= 2 && r6s.failed_num[1] == r6s.qd_idx); | |
2931 | ||
2932 | if ( s.written && | |
2933 | ( r6s.p_failed || ((test_bit(R5_Insync, &pdev->flags) | |
16a53ecc | 2934 | && !test_bit(R5_LOCKED, &pdev->flags) |
a4456856 DW |
2935 | && test_bit(R5_UPTODATE, &pdev->flags)))) && |
2936 | ( r6s.q_failed || ((test_bit(R5_Insync, &qdev->flags) | |
16a53ecc | 2937 | && !test_bit(R5_LOCKED, &qdev->flags) |
a4456856 | 2938 | && test_bit(R5_UPTODATE, &qdev->flags))))) |
1fe797e6 | 2939 | handle_stripe_clean_event(conf, sh, disks, &return_bi); |
16a53ecc N |
2940 | |
2941 | /* Now we might consider reading some blocks, either to check/generate | |
2942 | * parity, or to satisfy requests | |
2943 | * or to load a block that is being partially written. | |
2944 | */ | |
a4456856 DW |
2945 | if (s.to_read || s.non_overwrite || (s.to_write && s.failed) || |
2946 | (s.syncing && (s.uptodate < disks)) || s.expanding) | |
1fe797e6 | 2947 | handle_stripe_fill6(sh, &s, &r6s, disks); |
16a53ecc N |
2948 | |
2949 | /* now to consider writing and what else, if anything should be read */ | |
a4456856 | 2950 | if (s.to_write) |
1fe797e6 | 2951 | handle_stripe_dirtying6(conf, sh, &s, &r6s, disks); |
16a53ecc N |
2952 | |
2953 | /* maybe we need to check and possibly fix the parity for this stripe | |
a4456856 DW |
2954 | * Any reads will already have been scheduled, so we just see if enough |
2955 | * data is available | |
16a53ecc | 2956 | */ |
a4456856 DW |
2957 | if (s.syncing && s.locked == 0 && !test_bit(STRIPE_INSYNC, &sh->state)) |
2958 | handle_parity_checks6(conf, sh, &s, &r6s, tmp_page, disks); | |
16a53ecc | 2959 | |
a4456856 | 2960 | if (s.syncing && s.locked == 0 && test_bit(STRIPE_INSYNC, &sh->state)) { |
16a53ecc N |
2961 | md_done_sync(conf->mddev, STRIPE_SECTORS,1); |
2962 | clear_bit(STRIPE_SYNCING, &sh->state); | |
2963 | } | |
2964 | ||
2965 | /* If the failed drives are just a ReadError, then we might need | |
2966 | * to progress the repair/check process | |
2967 | */ | |
a4456856 DW |
2968 | if (s.failed <= 2 && !conf->mddev->ro) |
2969 | for (i = 0; i < s.failed; i++) { | |
2970 | dev = &sh->dev[r6s.failed_num[i]]; | |
16a53ecc N |
2971 | if (test_bit(R5_ReadError, &dev->flags) |
2972 | && !test_bit(R5_LOCKED, &dev->flags) | |
2973 | && test_bit(R5_UPTODATE, &dev->flags) | |
2974 | ) { | |
2975 | if (!test_bit(R5_ReWrite, &dev->flags)) { | |
2976 | set_bit(R5_Wantwrite, &dev->flags); | |
2977 | set_bit(R5_ReWrite, &dev->flags); | |
2978 | set_bit(R5_LOCKED, &dev->flags); | |
2979 | } else { | |
2980 | /* let's read it back */ | |
2981 | set_bit(R5_Wantread, &dev->flags); | |
2982 | set_bit(R5_LOCKED, &dev->flags); | |
2983 | } | |
2984 | } | |
2985 | } | |
f416885e | 2986 | |
a4456856 | 2987 | if (s.expanded && test_bit(STRIPE_EXPANDING, &sh->state)) { |
f416885e N |
2988 | /* Need to write out all blocks after computing P&Q */ |
2989 | sh->disks = conf->raid_disks; | |
2990 | sh->pd_idx = stripe_to_pdidx(sh->sector, conf, | |
2991 | conf->raid_disks); | |
2992 | compute_parity6(sh, RECONSTRUCT_WRITE); | |
2993 | for (i = conf->raid_disks ; i-- ; ) { | |
2994 | set_bit(R5_LOCKED, &sh->dev[i].flags); | |
a4456856 | 2995 | s.locked++; |
f416885e N |
2996 | set_bit(R5_Wantwrite, &sh->dev[i].flags); |
2997 | } | |
2998 | clear_bit(STRIPE_EXPANDING, &sh->state); | |
a4456856 | 2999 | } else if (s.expanded) { |
f416885e N |
3000 | clear_bit(STRIPE_EXPAND_READY, &sh->state); |
3001 | atomic_dec(&conf->reshape_stripes); | |
3002 | wake_up(&conf->wait_for_overlap); | |
3003 | md_done_sync(conf->mddev, STRIPE_SECTORS, 1); | |
3004 | } | |
3005 | ||
0f94e87c | 3006 | if (s.expanding && s.locked == 0 && |
976ea8d4 | 3007 | !test_bit(STRIPE_COMPUTE_RUN, &sh->state)) |
a4456856 | 3008 | handle_stripe_expansion(conf, sh, &r6s); |
f416885e | 3009 | |
6bfe0b49 | 3010 | unlock: |
16a53ecc N |
3011 | spin_unlock(&sh->lock); |
3012 | ||
6bfe0b49 DW |
3013 | /* wait for this device to become unblocked */ |
3014 | if (unlikely(blocked_rdev)) | |
3015 | md_wait_for_blocked_rdev(blocked_rdev, conf->mddev); | |
3016 | ||
f0e43bcd | 3017 | ops_run_io(sh, &s); |
16a53ecc | 3018 | |
f0e43bcd | 3019 | return_io(return_bi); |
df10cfbc DW |
3020 | |
3021 | return blocked_rdev == NULL; | |
16a53ecc N |
3022 | } |
3023 | ||
df10cfbc DW |
3024 | /* returns true if the stripe was handled */ |
3025 | static bool handle_stripe(struct stripe_head *sh, struct page *tmp_page) | |
16a53ecc N |
3026 | { |
3027 | if (sh->raid_conf->level == 6) | |
df10cfbc | 3028 | return handle_stripe6(sh, tmp_page); |
16a53ecc | 3029 | else |
df10cfbc | 3030 | return handle_stripe5(sh); |
16a53ecc N |
3031 | } |
3032 | ||
3033 | ||
3034 | ||
3035 | static void raid5_activate_delayed(raid5_conf_t *conf) | |
3036 | { | |
3037 | if (atomic_read(&conf->preread_active_stripes) < IO_THRESHOLD) { | |
3038 | while (!list_empty(&conf->delayed_list)) { | |
3039 | struct list_head *l = conf->delayed_list.next; | |
3040 | struct stripe_head *sh; | |
3041 | sh = list_entry(l, struct stripe_head, lru); | |
3042 | list_del_init(l); | |
3043 | clear_bit(STRIPE_DELAYED, &sh->state); | |
3044 | if (!test_and_set_bit(STRIPE_PREREAD_ACTIVE, &sh->state)) | |
3045 | atomic_inc(&conf->preread_active_stripes); | |
8b3e6cdc | 3046 | list_add_tail(&sh->lru, &conf->hold_list); |
16a53ecc | 3047 | } |
6ed3003c N |
3048 | } else |
3049 | blk_plug_device(conf->mddev->queue); | |
16a53ecc N |
3050 | } |
3051 | ||
3052 | static void activate_bit_delay(raid5_conf_t *conf) | |
3053 | { | |
3054 | /* device_lock is held */ | |
3055 | struct list_head head; | |
3056 | list_add(&head, &conf->bitmap_list); | |
3057 | list_del_init(&conf->bitmap_list); | |
3058 | while (!list_empty(&head)) { | |
3059 | struct stripe_head *sh = list_entry(head.next, struct stripe_head, lru); | |
3060 | list_del_init(&sh->lru); | |
3061 | atomic_inc(&sh->count); | |
3062 | __release_stripe(conf, sh); | |
3063 | } | |
3064 | } | |
3065 | ||
3066 | static void unplug_slaves(mddev_t *mddev) | |
3067 | { | |
3068 | raid5_conf_t *conf = mddev_to_conf(mddev); | |
3069 | int i; | |
3070 | ||
3071 | rcu_read_lock(); | |
3072 | for (i=0; i<mddev->raid_disks; i++) { | |
3073 | mdk_rdev_t *rdev = rcu_dereference(conf->disks[i].rdev); | |
3074 | if (rdev && !test_bit(Faulty, &rdev->flags) && atomic_read(&rdev->nr_pending)) { | |
165125e1 | 3075 | struct request_queue *r_queue = bdev_get_queue(rdev->bdev); |
16a53ecc N |
3076 | |
3077 | atomic_inc(&rdev->nr_pending); | |
3078 | rcu_read_unlock(); | |
3079 | ||
2ad8b1ef | 3080 | blk_unplug(r_queue); |
16a53ecc N |
3081 | |
3082 | rdev_dec_pending(rdev, mddev); | |
3083 | rcu_read_lock(); | |
3084 | } | |
3085 | } | |
3086 | rcu_read_unlock(); | |
3087 | } | |
3088 | ||
165125e1 | 3089 | static void raid5_unplug_device(struct request_queue *q) |
16a53ecc N |
3090 | { |
3091 | mddev_t *mddev = q->queuedata; | |
3092 | raid5_conf_t *conf = mddev_to_conf(mddev); | |
3093 | unsigned long flags; | |
3094 | ||
3095 | spin_lock_irqsave(&conf->device_lock, flags); | |
3096 | ||
3097 | if (blk_remove_plug(q)) { | |
3098 | conf->seq_flush++; | |
3099 | raid5_activate_delayed(conf); | |
72626685 | 3100 | } |
1da177e4 LT |
3101 | md_wakeup_thread(mddev->thread); |
3102 | ||
3103 | spin_unlock_irqrestore(&conf->device_lock, flags); | |
3104 | ||
3105 | unplug_slaves(mddev); | |
3106 | } | |
3107 | ||
f022b2fd N |
3108 | static int raid5_congested(void *data, int bits) |
3109 | { | |
3110 | mddev_t *mddev = data; | |
3111 | raid5_conf_t *conf = mddev_to_conf(mddev); | |
3112 | ||
3113 | /* No difference between reads and writes. Just check | |
3114 | * how busy the stripe_cache is | |
3115 | */ | |
3116 | if (conf->inactive_blocked) | |
3117 | return 1; | |
3118 | if (conf->quiesce) | |
3119 | return 1; | |
3120 | if (list_empty_careful(&conf->inactive_list)) | |
3121 | return 1; | |
3122 | ||
3123 | return 0; | |
3124 | } | |
3125 | ||
23032a0e RBJ |
3126 | /* We want read requests to align with chunks where possible, |
3127 | * but write requests don't need to. | |
3128 | */ | |
cc371e66 AK |
3129 | static int raid5_mergeable_bvec(struct request_queue *q, |
3130 | struct bvec_merge_data *bvm, | |
3131 | struct bio_vec *biovec) | |
23032a0e RBJ |
3132 | { |
3133 | mddev_t *mddev = q->queuedata; | |
cc371e66 | 3134 | sector_t sector = bvm->bi_sector + get_start_sect(bvm->bi_bdev); |
23032a0e RBJ |
3135 | int max; |
3136 | unsigned int chunk_sectors = mddev->chunk_size >> 9; | |
cc371e66 | 3137 | unsigned int bio_sectors = bvm->bi_size >> 9; |
23032a0e | 3138 | |
cc371e66 | 3139 | if ((bvm->bi_rw & 1) == WRITE) |
23032a0e RBJ |
3140 | return biovec->bv_len; /* always allow writes to be mergeable */ |
3141 | ||
3142 | max = (chunk_sectors - ((sector & (chunk_sectors - 1)) + bio_sectors)) << 9; | |
3143 | if (max < 0) max = 0; | |
3144 | if (max <= biovec->bv_len && bio_sectors == 0) | |
3145 | return biovec->bv_len; | |
3146 | else | |
3147 | return max; | |
3148 | } | |
3149 | ||
f679623f RBJ |
3150 | |
3151 | static int in_chunk_boundary(mddev_t *mddev, struct bio *bio) | |
3152 | { | |
3153 | sector_t sector = bio->bi_sector + get_start_sect(bio->bi_bdev); | |
3154 | unsigned int chunk_sectors = mddev->chunk_size >> 9; | |
3155 | unsigned int bio_sectors = bio->bi_size >> 9; | |
3156 | ||
3157 | return chunk_sectors >= | |
3158 | ((sector & (chunk_sectors - 1)) + bio_sectors); | |
3159 | } | |
3160 | ||
46031f9a RBJ |
3161 | /* |
3162 | * add bio to the retry LIFO ( in O(1) ... we are in interrupt ) | |
3163 | * later sampled by raid5d. | |
3164 | */ | |
3165 | static void add_bio_to_retry(struct bio *bi,raid5_conf_t *conf) | |
3166 | { | |
3167 | unsigned long flags; | |
3168 | ||
3169 | spin_lock_irqsave(&conf->device_lock, flags); | |
3170 | ||
3171 | bi->bi_next = conf->retry_read_aligned_list; | |
3172 | conf->retry_read_aligned_list = bi; | |
3173 | ||
3174 | spin_unlock_irqrestore(&conf->device_lock, flags); | |
3175 | md_wakeup_thread(conf->mddev->thread); | |
3176 | } | |
3177 | ||
3178 | ||
3179 | static struct bio *remove_bio_from_retry(raid5_conf_t *conf) | |
3180 | { | |
3181 | struct bio *bi; | |
3182 | ||
3183 | bi = conf->retry_read_aligned; | |
3184 | if (bi) { | |
3185 | conf->retry_read_aligned = NULL; | |
3186 | return bi; | |
3187 | } | |
3188 | bi = conf->retry_read_aligned_list; | |
3189 | if(bi) { | |
387bb173 | 3190 | conf->retry_read_aligned_list = bi->bi_next; |
46031f9a | 3191 | bi->bi_next = NULL; |
960e739d JA |
3192 | /* |
3193 | * this sets the active strip count to 1 and the processed | |
3194 | * strip count to zero (upper 8 bits) | |
3195 | */ | |
46031f9a | 3196 | bi->bi_phys_segments = 1; /* biased count of active stripes */ |
46031f9a RBJ |
3197 | } |
3198 | ||
3199 | return bi; | |
3200 | } | |
3201 | ||
3202 | ||
f679623f RBJ |
3203 | /* |
3204 | * The "raid5_align_endio" should check if the read succeeded and if it | |
3205 | * did, call bio_endio on the original bio (having bio_put the new bio | |
3206 | * first). | |
3207 | * If the read failed.. | |
3208 | */ | |
6712ecf8 | 3209 | static void raid5_align_endio(struct bio *bi, int error) |
f679623f RBJ |
3210 | { |
3211 | struct bio* raid_bi = bi->bi_private; | |
46031f9a RBJ |
3212 | mddev_t *mddev; |
3213 | raid5_conf_t *conf; | |
3214 | int uptodate = test_bit(BIO_UPTODATE, &bi->bi_flags); | |
3215 | mdk_rdev_t *rdev; | |
3216 | ||
f679623f | 3217 | bio_put(bi); |
46031f9a RBJ |
3218 | |
3219 | mddev = raid_bi->bi_bdev->bd_disk->queue->queuedata; | |
3220 | conf = mddev_to_conf(mddev); | |
3221 | rdev = (void*)raid_bi->bi_next; | |
3222 | raid_bi->bi_next = NULL; | |
3223 | ||
3224 | rdev_dec_pending(rdev, conf->mddev); | |
3225 | ||
3226 | if (!error && uptodate) { | |
6712ecf8 | 3227 | bio_endio(raid_bi, 0); |
46031f9a RBJ |
3228 | if (atomic_dec_and_test(&conf->active_aligned_reads)) |
3229 | wake_up(&conf->wait_for_stripe); | |
6712ecf8 | 3230 | return; |
46031f9a RBJ |
3231 | } |
3232 | ||
3233 | ||
45b4233c | 3234 | pr_debug("raid5_align_endio : io error...handing IO for a retry\n"); |
46031f9a RBJ |
3235 | |
3236 | add_bio_to_retry(raid_bi, conf); | |
f679623f RBJ |
3237 | } |
3238 | ||
387bb173 NB |
3239 | static int bio_fits_rdev(struct bio *bi) |
3240 | { | |
165125e1 | 3241 | struct request_queue *q = bdev_get_queue(bi->bi_bdev); |
387bb173 NB |
3242 | |
3243 | if ((bi->bi_size>>9) > q->max_sectors) | |
3244 | return 0; | |
3245 | blk_recount_segments(q, bi); | |
960e739d | 3246 | if (bi->bi_phys_segments > q->max_phys_segments) |
387bb173 NB |
3247 | return 0; |
3248 | ||
3249 | if (q->merge_bvec_fn) | |
3250 | /* it's too hard to apply the merge_bvec_fn at this stage, | |
3251 | * just just give up | |
3252 | */ | |
3253 | return 0; | |
3254 | ||
3255 | return 1; | |
3256 | } | |
3257 | ||
3258 | ||
165125e1 | 3259 | static int chunk_aligned_read(struct request_queue *q, struct bio * raid_bio) |
f679623f RBJ |
3260 | { |
3261 | mddev_t *mddev = q->queuedata; | |
3262 | raid5_conf_t *conf = mddev_to_conf(mddev); | |
3263 | const unsigned int raid_disks = conf->raid_disks; | |
46031f9a | 3264 | const unsigned int data_disks = raid_disks - conf->max_degraded; |
f679623f RBJ |
3265 | unsigned int dd_idx, pd_idx; |
3266 | struct bio* align_bi; | |
3267 | mdk_rdev_t *rdev; | |
3268 | ||
3269 | if (!in_chunk_boundary(mddev, raid_bio)) { | |
45b4233c | 3270 | pr_debug("chunk_aligned_read : non aligned\n"); |
f679623f RBJ |
3271 | return 0; |
3272 | } | |
3273 | /* | |
3274 | * use bio_clone to make a copy of the bio | |
3275 | */ | |
3276 | align_bi = bio_clone(raid_bio, GFP_NOIO); | |
3277 | if (!align_bi) | |
3278 | return 0; | |
3279 | /* | |
3280 | * set bi_end_io to a new function, and set bi_private to the | |
3281 | * original bio. | |
3282 | */ | |
3283 | align_bi->bi_end_io = raid5_align_endio; | |
3284 | align_bi->bi_private = raid_bio; | |
3285 | /* | |
3286 | * compute position | |
3287 | */ | |
3288 | align_bi->bi_sector = raid5_compute_sector(raid_bio->bi_sector, | |
3289 | raid_disks, | |
3290 | data_disks, | |
3291 | &dd_idx, | |
3292 | &pd_idx, | |
3293 | conf); | |
3294 | ||
3295 | rcu_read_lock(); | |
3296 | rdev = rcu_dereference(conf->disks[dd_idx].rdev); | |
3297 | if (rdev && test_bit(In_sync, &rdev->flags)) { | |
f679623f RBJ |
3298 | atomic_inc(&rdev->nr_pending); |
3299 | rcu_read_unlock(); | |
46031f9a RBJ |
3300 | raid_bio->bi_next = (void*)rdev; |
3301 | align_bi->bi_bdev = rdev->bdev; | |
3302 | align_bi->bi_flags &= ~(1 << BIO_SEG_VALID); | |
3303 | align_bi->bi_sector += rdev->data_offset; | |
3304 | ||
387bb173 NB |
3305 | if (!bio_fits_rdev(align_bi)) { |
3306 | /* too big in some way */ | |
3307 | bio_put(align_bi); | |
3308 | rdev_dec_pending(rdev, mddev); | |
3309 | return 0; | |
3310 | } | |
3311 | ||
46031f9a RBJ |
3312 | spin_lock_irq(&conf->device_lock); |
3313 | wait_event_lock_irq(conf->wait_for_stripe, | |
3314 | conf->quiesce == 0, | |
3315 | conf->device_lock, /* nothing */); | |
3316 | atomic_inc(&conf->active_aligned_reads); | |
3317 | spin_unlock_irq(&conf->device_lock); | |
3318 | ||
f679623f RBJ |
3319 | generic_make_request(align_bi); |
3320 | return 1; | |
3321 | } else { | |
3322 | rcu_read_unlock(); | |
46031f9a | 3323 | bio_put(align_bi); |
f679623f RBJ |
3324 | return 0; |
3325 | } | |
3326 | } | |
3327 | ||
8b3e6cdc DW |
3328 | /* __get_priority_stripe - get the next stripe to process |
3329 | * | |
3330 | * Full stripe writes are allowed to pass preread active stripes up until | |
3331 | * the bypass_threshold is exceeded. In general the bypass_count | |
3332 | * increments when the handle_list is handled before the hold_list; however, it | |
3333 | * will not be incremented when STRIPE_IO_STARTED is sampled set signifying a | |
3334 | * stripe with in flight i/o. The bypass_count will be reset when the | |
3335 | * head of the hold_list has changed, i.e. the head was promoted to the | |
3336 | * handle_list. | |
3337 | */ | |
3338 | static struct stripe_head *__get_priority_stripe(raid5_conf_t *conf) | |
3339 | { | |
3340 | struct stripe_head *sh; | |
3341 | ||
3342 | pr_debug("%s: handle: %s hold: %s full_writes: %d bypass_count: %d\n", | |
3343 | __func__, | |
3344 | list_empty(&conf->handle_list) ? "empty" : "busy", | |
3345 | list_empty(&conf->hold_list) ? "empty" : "busy", | |
3346 | atomic_read(&conf->pending_full_writes), conf->bypass_count); | |
3347 | ||
3348 | if (!list_empty(&conf->handle_list)) { | |
3349 | sh = list_entry(conf->handle_list.next, typeof(*sh), lru); | |
3350 | ||
3351 | if (list_empty(&conf->hold_list)) | |
3352 | conf->bypass_count = 0; | |
3353 | else if (!test_bit(STRIPE_IO_STARTED, &sh->state)) { | |
3354 | if (conf->hold_list.next == conf->last_hold) | |
3355 | conf->bypass_count++; | |
3356 | else { | |
3357 | conf->last_hold = conf->hold_list.next; | |
3358 | conf->bypass_count -= conf->bypass_threshold; | |
3359 | if (conf->bypass_count < 0) | |
3360 | conf->bypass_count = 0; | |
3361 | } | |
3362 | } | |
3363 | } else if (!list_empty(&conf->hold_list) && | |
3364 | ((conf->bypass_threshold && | |
3365 | conf->bypass_count > conf->bypass_threshold) || | |
3366 | atomic_read(&conf->pending_full_writes) == 0)) { | |
3367 | sh = list_entry(conf->hold_list.next, | |
3368 | typeof(*sh), lru); | |
3369 | conf->bypass_count -= conf->bypass_threshold; | |
3370 | if (conf->bypass_count < 0) | |
3371 | conf->bypass_count = 0; | |
3372 | } else | |
3373 | return NULL; | |
3374 | ||
3375 | list_del_init(&sh->lru); | |
3376 | atomic_inc(&sh->count); | |
3377 | BUG_ON(atomic_read(&sh->count) != 1); | |
3378 | return sh; | |
3379 | } | |
f679623f | 3380 | |
165125e1 | 3381 | static int make_request(struct request_queue *q, struct bio * bi) |
1da177e4 LT |
3382 | { |
3383 | mddev_t *mddev = q->queuedata; | |
3384 | raid5_conf_t *conf = mddev_to_conf(mddev); | |
1da177e4 LT |
3385 | unsigned int dd_idx, pd_idx; |
3386 | sector_t new_sector; | |
3387 | sector_t logical_sector, last_sector; | |
3388 | struct stripe_head *sh; | |
a362357b | 3389 | const int rw = bio_data_dir(bi); |
f6344757 | 3390 | int remaining; |
1da177e4 | 3391 | |
e5dcdd80 | 3392 | if (unlikely(bio_barrier(bi))) { |
6712ecf8 | 3393 | bio_endio(bi, -EOPNOTSUPP); |
e5dcdd80 N |
3394 | return 0; |
3395 | } | |
3396 | ||
3d310eb7 | 3397 | md_write_start(mddev, bi); |
06d91a5f | 3398 | |
a362357b JA |
3399 | disk_stat_inc(mddev->gendisk, ios[rw]); |
3400 | disk_stat_add(mddev->gendisk, sectors[rw], bio_sectors(bi)); | |
1da177e4 | 3401 | |
802ba064 | 3402 | if (rw == READ && |
52488615 RBJ |
3403 | mddev->reshape_position == MaxSector && |
3404 | chunk_aligned_read(q,bi)) | |
3405 | return 0; | |
3406 | ||
1da177e4 LT |
3407 | logical_sector = bi->bi_sector & ~((sector_t)STRIPE_SECTORS-1); |
3408 | last_sector = bi->bi_sector + (bi->bi_size>>9); | |
3409 | bi->bi_next = NULL; | |
3410 | bi->bi_phys_segments = 1; /* over-loaded to count active stripes */ | |
06d91a5f | 3411 | |
1da177e4 LT |
3412 | for (;logical_sector < last_sector; logical_sector += STRIPE_SECTORS) { |
3413 | DEFINE_WAIT(w); | |
16a53ecc | 3414 | int disks, data_disks; |
b578d55f | 3415 | |
7ecaa1e6 | 3416 | retry: |
b578d55f | 3417 | prepare_to_wait(&conf->wait_for_overlap, &w, TASK_UNINTERRUPTIBLE); |
7ecaa1e6 N |
3418 | if (likely(conf->expand_progress == MaxSector)) |
3419 | disks = conf->raid_disks; | |
3420 | else { | |
df8e7f76 N |
3421 | /* spinlock is needed as expand_progress may be |
3422 | * 64bit on a 32bit platform, and so it might be | |
3423 | * possible to see a half-updated value | |
3424 | * Ofcourse expand_progress could change after | |
3425 | * the lock is dropped, so once we get a reference | |
3426 | * to the stripe that we think it is, we will have | |
3427 | * to check again. | |
3428 | */ | |
7ecaa1e6 N |
3429 | spin_lock_irq(&conf->device_lock); |
3430 | disks = conf->raid_disks; | |
3431 | if (logical_sector >= conf->expand_progress) | |
3432 | disks = conf->previous_raid_disks; | |
b578d55f N |
3433 | else { |
3434 | if (logical_sector >= conf->expand_lo) { | |
3435 | spin_unlock_irq(&conf->device_lock); | |
3436 | schedule(); | |
3437 | goto retry; | |
3438 | } | |
3439 | } | |
7ecaa1e6 N |
3440 | spin_unlock_irq(&conf->device_lock); |
3441 | } | |
16a53ecc N |
3442 | data_disks = disks - conf->max_degraded; |
3443 | ||
3444 | new_sector = raid5_compute_sector(logical_sector, disks, data_disks, | |
7ecaa1e6 | 3445 | &dd_idx, &pd_idx, conf); |
45b4233c | 3446 | pr_debug("raid5: make_request, sector %llu logical %llu\n", |
1da177e4 LT |
3447 | (unsigned long long)new_sector, |
3448 | (unsigned long long)logical_sector); | |
3449 | ||
7ecaa1e6 | 3450 | sh = get_active_stripe(conf, new_sector, disks, pd_idx, (bi->bi_rw&RWA_MASK)); |
1da177e4 | 3451 | if (sh) { |
7ecaa1e6 N |
3452 | if (unlikely(conf->expand_progress != MaxSector)) { |
3453 | /* expansion might have moved on while waiting for a | |
df8e7f76 N |
3454 | * stripe, so we must do the range check again. |
3455 | * Expansion could still move past after this | |
3456 | * test, but as we are holding a reference to | |
3457 | * 'sh', we know that if that happens, | |
3458 | * STRIPE_EXPANDING will get set and the expansion | |
3459 | * won't proceed until we finish with the stripe. | |
7ecaa1e6 N |
3460 | */ |
3461 | int must_retry = 0; | |
3462 | spin_lock_irq(&conf->device_lock); | |
3463 | if (logical_sector < conf->expand_progress && | |
3464 | disks == conf->previous_raid_disks) | |
3465 | /* mismatch, need to try again */ | |
3466 | must_retry = 1; | |
3467 | spin_unlock_irq(&conf->device_lock); | |
3468 | if (must_retry) { | |
3469 | release_stripe(sh); | |
3470 | goto retry; | |
3471 | } | |
3472 | } | |
e464eafd N |
3473 | /* FIXME what if we get a false positive because these |
3474 | * are being updated. | |
3475 | */ | |
3476 | if (logical_sector >= mddev->suspend_lo && | |
3477 | logical_sector < mddev->suspend_hi) { | |
3478 | release_stripe(sh); | |
3479 | schedule(); | |
3480 | goto retry; | |
3481 | } | |
7ecaa1e6 N |
3482 | |
3483 | if (test_bit(STRIPE_EXPANDING, &sh->state) || | |
3484 | !add_stripe_bio(sh, bi, dd_idx, (bi->bi_rw&RW_MASK))) { | |
3485 | /* Stripe is busy expanding or | |
3486 | * add failed due to overlap. Flush everything | |
1da177e4 LT |
3487 | * and wait a while |
3488 | */ | |
3489 | raid5_unplug_device(mddev->queue); | |
3490 | release_stripe(sh); | |
3491 | schedule(); | |
3492 | goto retry; | |
3493 | } | |
3494 | finish_wait(&conf->wait_for_overlap, &w); | |
6ed3003c N |
3495 | set_bit(STRIPE_HANDLE, &sh->state); |
3496 | clear_bit(STRIPE_DELAYED, &sh->state); | |
1da177e4 | 3497 | release_stripe(sh); |
1da177e4 LT |
3498 | } else { |
3499 | /* cannot get stripe for read-ahead, just give-up */ | |
3500 | clear_bit(BIO_UPTODATE, &bi->bi_flags); | |
3501 | finish_wait(&conf->wait_for_overlap, &w); | |
3502 | break; | |
3503 | } | |
3504 | ||
3505 | } | |
3506 | spin_lock_irq(&conf->device_lock); | |
960e739d | 3507 | remaining = raid5_dec_bi_phys_segments(bi); |
f6344757 N |
3508 | spin_unlock_irq(&conf->device_lock); |
3509 | if (remaining == 0) { | |
1da177e4 | 3510 | |
16a53ecc | 3511 | if ( rw == WRITE ) |
1da177e4 | 3512 | md_write_end(mddev); |
6712ecf8 | 3513 | |
0e13fe23 | 3514 | bio_endio(bi, 0); |
1da177e4 | 3515 | } |
1da177e4 LT |
3516 | return 0; |
3517 | } | |
3518 | ||
52c03291 | 3519 | static sector_t reshape_request(mddev_t *mddev, sector_t sector_nr, int *skipped) |
1da177e4 | 3520 | { |
52c03291 N |
3521 | /* reshaping is quite different to recovery/resync so it is |
3522 | * handled quite separately ... here. | |
3523 | * | |
3524 | * On each call to sync_request, we gather one chunk worth of | |
3525 | * destination stripes and flag them as expanding. | |
3526 | * Then we find all the source stripes and request reads. | |
3527 | * As the reads complete, handle_stripe will copy the data | |
3528 | * into the destination stripe and release that stripe. | |
3529 | */ | |
1da177e4 LT |
3530 | raid5_conf_t *conf = (raid5_conf_t *) mddev->private; |
3531 | struct stripe_head *sh; | |
ccfcc3c1 N |
3532 | int pd_idx; |
3533 | sector_t first_sector, last_sector; | |
f416885e N |
3534 | int raid_disks = conf->previous_raid_disks; |
3535 | int data_disks = raid_disks - conf->max_degraded; | |
3536 | int new_data_disks = conf->raid_disks - conf->max_degraded; | |
52c03291 N |
3537 | int i; |
3538 | int dd_idx; | |
3539 | sector_t writepos, safepos, gap; | |
3540 | ||
3541 | if (sector_nr == 0 && | |
3542 | conf->expand_progress != 0) { | |
3543 | /* restarting in the middle, skip the initial sectors */ | |
3544 | sector_nr = conf->expand_progress; | |
f416885e | 3545 | sector_div(sector_nr, new_data_disks); |
52c03291 N |
3546 | *skipped = 1; |
3547 | return sector_nr; | |
3548 | } | |
3549 | ||
3550 | /* we update the metadata when there is more than 3Meg | |
3551 | * in the block range (that is rather arbitrary, should | |
3552 | * probably be time based) or when the data about to be | |
3553 | * copied would over-write the source of the data at | |
3554 | * the front of the range. | |
3555 | * i.e. one new_stripe forward from expand_progress new_maps | |
3556 | * to after where expand_lo old_maps to | |
3557 | */ | |
3558 | writepos = conf->expand_progress + | |
f416885e N |
3559 | conf->chunk_size/512*(new_data_disks); |
3560 | sector_div(writepos, new_data_disks); | |
52c03291 | 3561 | safepos = conf->expand_lo; |
f416885e | 3562 | sector_div(safepos, data_disks); |
52c03291 N |
3563 | gap = conf->expand_progress - conf->expand_lo; |
3564 | ||
3565 | if (writepos >= safepos || | |
f416885e | 3566 | gap > (new_data_disks)*3000*2 /*3Meg*/) { |
52c03291 N |
3567 | /* Cannot proceed until we've updated the superblock... */ |
3568 | wait_event(conf->wait_for_overlap, | |
3569 | atomic_read(&conf->reshape_stripes)==0); | |
3570 | mddev->reshape_position = conf->expand_progress; | |
850b2b42 | 3571 | set_bit(MD_CHANGE_DEVS, &mddev->flags); |
52c03291 | 3572 | md_wakeup_thread(mddev->thread); |
850b2b42 | 3573 | wait_event(mddev->sb_wait, mddev->flags == 0 || |
52c03291 N |
3574 | kthread_should_stop()); |
3575 | spin_lock_irq(&conf->device_lock); | |
3576 | conf->expand_lo = mddev->reshape_position; | |
3577 | spin_unlock_irq(&conf->device_lock); | |
3578 | wake_up(&conf->wait_for_overlap); | |
3579 | } | |
3580 | ||
3581 | for (i=0; i < conf->chunk_size/512; i+= STRIPE_SECTORS) { | |
3582 | int j; | |
3583 | int skipped = 0; | |
3584 | pd_idx = stripe_to_pdidx(sector_nr+i, conf, conf->raid_disks); | |
3585 | sh = get_active_stripe(conf, sector_nr+i, | |
3586 | conf->raid_disks, pd_idx, 0); | |
3587 | set_bit(STRIPE_EXPANDING, &sh->state); | |
3588 | atomic_inc(&conf->reshape_stripes); | |
3589 | /* If any of this stripe is beyond the end of the old | |
3590 | * array, then we need to zero those blocks | |
3591 | */ | |
3592 | for (j=sh->disks; j--;) { | |
3593 | sector_t s; | |
3594 | if (j == sh->pd_idx) | |
3595 | continue; | |
f416885e N |
3596 | if (conf->level == 6 && |
3597 | j == raid6_next_disk(sh->pd_idx, sh->disks)) | |
3598 | continue; | |
52c03291 | 3599 | s = compute_blocknr(sh, j); |
f233ea5c | 3600 | if (s < mddev->array_sectors) { |
52c03291 N |
3601 | skipped = 1; |
3602 | continue; | |
3603 | } | |
3604 | memset(page_address(sh->dev[j].page), 0, STRIPE_SIZE); | |
3605 | set_bit(R5_Expanded, &sh->dev[j].flags); | |
3606 | set_bit(R5_UPTODATE, &sh->dev[j].flags); | |
3607 | } | |
3608 | if (!skipped) { | |
3609 | set_bit(STRIPE_EXPAND_READY, &sh->state); | |
3610 | set_bit(STRIPE_HANDLE, &sh->state); | |
3611 | } | |
3612 | release_stripe(sh); | |
3613 | } | |
3614 | spin_lock_irq(&conf->device_lock); | |
6d3baf2e | 3615 | conf->expand_progress = (sector_nr + i) * new_data_disks; |
52c03291 N |
3616 | spin_unlock_irq(&conf->device_lock); |
3617 | /* Ok, those stripe are ready. We can start scheduling | |
3618 | * reads on the source stripes. | |
3619 | * The source stripes are determined by mapping the first and last | |
3620 | * block on the destination stripes. | |
3621 | */ | |
52c03291 | 3622 | first_sector = |
f416885e | 3623 | raid5_compute_sector(sector_nr*(new_data_disks), |
52c03291 N |
3624 | raid_disks, data_disks, |
3625 | &dd_idx, &pd_idx, conf); | |
3626 | last_sector = | |
3627 | raid5_compute_sector((sector_nr+conf->chunk_size/512) | |
f416885e | 3628 | *(new_data_disks) -1, |
52c03291 N |
3629 | raid_disks, data_disks, |
3630 | &dd_idx, &pd_idx, conf); | |
3631 | if (last_sector >= (mddev->size<<1)) | |
3632 | last_sector = (mddev->size<<1)-1; | |
3633 | while (first_sector <= last_sector) { | |
f416885e N |
3634 | pd_idx = stripe_to_pdidx(first_sector, conf, |
3635 | conf->previous_raid_disks); | |
52c03291 N |
3636 | sh = get_active_stripe(conf, first_sector, |
3637 | conf->previous_raid_disks, pd_idx, 0); | |
3638 | set_bit(STRIPE_EXPAND_SOURCE, &sh->state); | |
3639 | set_bit(STRIPE_HANDLE, &sh->state); | |
3640 | release_stripe(sh); | |
3641 | first_sector += STRIPE_SECTORS; | |
3642 | } | |
c6207277 N |
3643 | /* If this takes us to the resync_max point where we have to pause, |
3644 | * then we need to write out the superblock. | |
3645 | */ | |
3646 | sector_nr += conf->chunk_size>>9; | |
3647 | if (sector_nr >= mddev->resync_max) { | |
3648 | /* Cannot proceed until we've updated the superblock... */ | |
3649 | wait_event(conf->wait_for_overlap, | |
3650 | atomic_read(&conf->reshape_stripes) == 0); | |
3651 | mddev->reshape_position = conf->expand_progress; | |
3652 | set_bit(MD_CHANGE_DEVS, &mddev->flags); | |
3653 | md_wakeup_thread(mddev->thread); | |
3654 | wait_event(mddev->sb_wait, | |
3655 | !test_bit(MD_CHANGE_DEVS, &mddev->flags) | |
3656 | || kthread_should_stop()); | |
3657 | spin_lock_irq(&conf->device_lock); | |
3658 | conf->expand_lo = mddev->reshape_position; | |
3659 | spin_unlock_irq(&conf->device_lock); | |
3660 | wake_up(&conf->wait_for_overlap); | |
3661 | } | |
52c03291 N |
3662 | return conf->chunk_size>>9; |
3663 | } | |
3664 | ||
3665 | /* FIXME go_faster isn't used */ | |
3666 | static inline sector_t sync_request(mddev_t *mddev, sector_t sector_nr, int *skipped, int go_faster) | |
3667 | { | |
3668 | raid5_conf_t *conf = (raid5_conf_t *) mddev->private; | |
3669 | struct stripe_head *sh; | |
3670 | int pd_idx; | |
1da177e4 | 3671 | int raid_disks = conf->raid_disks; |
72626685 N |
3672 | sector_t max_sector = mddev->size << 1; |
3673 | int sync_blocks; | |
16a53ecc N |
3674 | int still_degraded = 0; |
3675 | int i; | |
1da177e4 | 3676 | |
72626685 | 3677 | if (sector_nr >= max_sector) { |
1da177e4 LT |
3678 | /* just being told to finish up .. nothing much to do */ |
3679 | unplug_slaves(mddev); | |
29269553 N |
3680 | if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)) { |
3681 | end_reshape(conf); | |
3682 | return 0; | |
3683 | } | |
72626685 N |
3684 | |
3685 | if (mddev->curr_resync < max_sector) /* aborted */ | |
3686 | bitmap_end_sync(mddev->bitmap, mddev->curr_resync, | |
3687 | &sync_blocks, 1); | |
16a53ecc | 3688 | else /* completed sync */ |
72626685 N |
3689 | conf->fullsync = 0; |
3690 | bitmap_close_sync(mddev->bitmap); | |
3691 | ||
1da177e4 LT |
3692 | return 0; |
3693 | } | |
ccfcc3c1 | 3694 | |
52c03291 N |
3695 | if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)) |
3696 | return reshape_request(mddev, sector_nr, skipped); | |
f6705578 | 3697 | |
c6207277 N |
3698 | /* No need to check resync_max as we never do more than one |
3699 | * stripe, and as resync_max will always be on a chunk boundary, | |
3700 | * if the check in md_do_sync didn't fire, there is no chance | |
3701 | * of overstepping resync_max here | |
3702 | */ | |
3703 | ||
16a53ecc | 3704 | /* if there is too many failed drives and we are trying |
1da177e4 LT |
3705 | * to resync, then assert that we are finished, because there is |
3706 | * nothing we can do. | |
3707 | */ | |
3285edf1 | 3708 | if (mddev->degraded >= conf->max_degraded && |
16a53ecc | 3709 | test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) { |
57afd89f N |
3710 | sector_t rv = (mddev->size << 1) - sector_nr; |
3711 | *skipped = 1; | |
1da177e4 LT |
3712 | return rv; |
3713 | } | |
72626685 | 3714 | if (!bitmap_start_sync(mddev->bitmap, sector_nr, &sync_blocks, 1) && |
3855ad9f | 3715 | !test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery) && |
72626685 N |
3716 | !conf->fullsync && sync_blocks >= STRIPE_SECTORS) { |
3717 | /* we can skip this block, and probably more */ | |
3718 | sync_blocks /= STRIPE_SECTORS; | |
3719 | *skipped = 1; | |
3720 | return sync_blocks * STRIPE_SECTORS; /* keep things rounded to whole stripes */ | |
3721 | } | |
1da177e4 | 3722 | |
b47490c9 N |
3723 | |
3724 | bitmap_cond_end_sync(mddev->bitmap, sector_nr); | |
3725 | ||
ccfcc3c1 | 3726 | pd_idx = stripe_to_pdidx(sector_nr, conf, raid_disks); |
7ecaa1e6 | 3727 | sh = get_active_stripe(conf, sector_nr, raid_disks, pd_idx, 1); |
1da177e4 | 3728 | if (sh == NULL) { |
7ecaa1e6 | 3729 | sh = get_active_stripe(conf, sector_nr, raid_disks, pd_idx, 0); |
1da177e4 | 3730 | /* make sure we don't swamp the stripe cache if someone else |
16a53ecc | 3731 | * is trying to get access |
1da177e4 | 3732 | */ |
66c006a5 | 3733 | schedule_timeout_uninterruptible(1); |
1da177e4 | 3734 | } |
16a53ecc N |
3735 | /* Need to check if array will still be degraded after recovery/resync |
3736 | * We don't need to check the 'failed' flag as when that gets set, | |
3737 | * recovery aborts. | |
3738 | */ | |
3739 | for (i=0; i<mddev->raid_disks; i++) | |
3740 | if (conf->disks[i].rdev == NULL) | |
3741 | still_degraded = 1; | |
3742 | ||
3743 | bitmap_start_sync(mddev->bitmap, sector_nr, &sync_blocks, still_degraded); | |
3744 | ||
3745 | spin_lock(&sh->lock); | |
1da177e4 LT |
3746 | set_bit(STRIPE_SYNCING, &sh->state); |
3747 | clear_bit(STRIPE_INSYNC, &sh->state); | |
3748 | spin_unlock(&sh->lock); | |
3749 | ||
df10cfbc DW |
3750 | /* wait for any blocked device to be handled */ |
3751 | while(unlikely(!handle_stripe(sh, NULL))) | |
3752 | ; | |
1da177e4 LT |
3753 | release_stripe(sh); |
3754 | ||
3755 | return STRIPE_SECTORS; | |
3756 | } | |
3757 | ||
46031f9a RBJ |
3758 | static int retry_aligned_read(raid5_conf_t *conf, struct bio *raid_bio) |
3759 | { | |
3760 | /* We may not be able to submit a whole bio at once as there | |
3761 | * may not be enough stripe_heads available. | |
3762 | * We cannot pre-allocate enough stripe_heads as we may need | |
3763 | * more than exist in the cache (if we allow ever large chunks). | |
3764 | * So we do one stripe head at a time and record in | |
3765 | * ->bi_hw_segments how many have been done. | |
3766 | * | |
3767 | * We *know* that this entire raid_bio is in one chunk, so | |
3768 | * it will be only one 'dd_idx' and only need one call to raid5_compute_sector. | |
3769 | */ | |
3770 | struct stripe_head *sh; | |
3771 | int dd_idx, pd_idx; | |
3772 | sector_t sector, logical_sector, last_sector; | |
3773 | int scnt = 0; | |
3774 | int remaining; | |
3775 | int handled = 0; | |
3776 | ||
3777 | logical_sector = raid_bio->bi_sector & ~((sector_t)STRIPE_SECTORS-1); | |
3778 | sector = raid5_compute_sector( logical_sector, | |
3779 | conf->raid_disks, | |
3780 | conf->raid_disks - conf->max_degraded, | |
3781 | &dd_idx, | |
3782 | &pd_idx, | |
3783 | conf); | |
3784 | last_sector = raid_bio->bi_sector + (raid_bio->bi_size>>9); | |
3785 | ||
3786 | for (; logical_sector < last_sector; | |
387bb173 NB |
3787 | logical_sector += STRIPE_SECTORS, |
3788 | sector += STRIPE_SECTORS, | |
3789 | scnt++) { | |
46031f9a | 3790 | |
960e739d | 3791 | if (scnt < raid5_bi_hw_segments(raid_bio)) |
46031f9a RBJ |
3792 | /* already done this stripe */ |
3793 | continue; | |
3794 | ||
3795 | sh = get_active_stripe(conf, sector, conf->raid_disks, pd_idx, 1); | |
3796 | ||
3797 | if (!sh) { | |
3798 | /* failed to get a stripe - must wait */ | |
960e739d | 3799 | raid5_set_bi_hw_segments(raid_bio, scnt); |
46031f9a RBJ |
3800 | conf->retry_read_aligned = raid_bio; |
3801 | return handled; | |
3802 | } | |
3803 | ||
3804 | set_bit(R5_ReadError, &sh->dev[dd_idx].flags); | |
387bb173 NB |
3805 | if (!add_stripe_bio(sh, raid_bio, dd_idx, 0)) { |
3806 | release_stripe(sh); | |
960e739d | 3807 | raid5_set_bi_hw_segments(raid_bio, scnt); |
387bb173 NB |
3808 | conf->retry_read_aligned = raid_bio; |
3809 | return handled; | |
3810 | } | |
3811 | ||
46031f9a RBJ |
3812 | handle_stripe(sh, NULL); |
3813 | release_stripe(sh); | |
3814 | handled++; | |
3815 | } | |
3816 | spin_lock_irq(&conf->device_lock); | |
960e739d | 3817 | remaining = raid5_dec_bi_phys_segments(raid_bio); |
46031f9a | 3818 | spin_unlock_irq(&conf->device_lock); |
0e13fe23 NB |
3819 | if (remaining == 0) |
3820 | bio_endio(raid_bio, 0); | |
46031f9a RBJ |
3821 | if (atomic_dec_and_test(&conf->active_aligned_reads)) |
3822 | wake_up(&conf->wait_for_stripe); | |
3823 | return handled; | |
3824 | } | |
3825 | ||
3826 | ||
3827 | ||
1da177e4 LT |
3828 | /* |
3829 | * This is our raid5 kernel thread. | |
3830 | * | |
3831 | * We scan the hash table for stripes which can be handled now. | |
3832 | * During the scan, completed stripes are saved for us by the interrupt | |
3833 | * handler, so that they will not have to wait for our next wakeup. | |
3834 | */ | |
6ed3003c | 3835 | static void raid5d(mddev_t *mddev) |
1da177e4 LT |
3836 | { |
3837 | struct stripe_head *sh; | |
3838 | raid5_conf_t *conf = mddev_to_conf(mddev); | |
3839 | int handled; | |
3840 | ||
45b4233c | 3841 | pr_debug("+++ raid5d active\n"); |
1da177e4 LT |
3842 | |
3843 | md_check_recovery(mddev); | |
1da177e4 LT |
3844 | |
3845 | handled = 0; | |
3846 | spin_lock_irq(&conf->device_lock); | |
3847 | while (1) { | |
46031f9a | 3848 | struct bio *bio; |
1da177e4 | 3849 | |
ae3c20cc | 3850 | if (conf->seq_flush != conf->seq_write) { |
72626685 | 3851 | int seq = conf->seq_flush; |
700e432d | 3852 | spin_unlock_irq(&conf->device_lock); |
72626685 | 3853 | bitmap_unplug(mddev->bitmap); |
700e432d | 3854 | spin_lock_irq(&conf->device_lock); |
72626685 N |
3855 | conf->seq_write = seq; |
3856 | activate_bit_delay(conf); | |
3857 | } | |
3858 | ||
46031f9a RBJ |
3859 | while ((bio = remove_bio_from_retry(conf))) { |
3860 | int ok; | |
3861 | spin_unlock_irq(&conf->device_lock); | |
3862 | ok = retry_aligned_read(conf, bio); | |
3863 | spin_lock_irq(&conf->device_lock); | |
3864 | if (!ok) | |
3865 | break; | |
3866 | handled++; | |
3867 | } | |
3868 | ||
8b3e6cdc DW |
3869 | sh = __get_priority_stripe(conf); |
3870 | ||
c9f21aaf | 3871 | if (!sh) |
1da177e4 | 3872 | break; |
1da177e4 LT |
3873 | spin_unlock_irq(&conf->device_lock); |
3874 | ||
3875 | handled++; | |
16a53ecc | 3876 | handle_stripe(sh, conf->spare_page); |
1da177e4 LT |
3877 | release_stripe(sh); |
3878 | ||
3879 | spin_lock_irq(&conf->device_lock); | |
3880 | } | |
45b4233c | 3881 | pr_debug("%d stripes handled\n", handled); |
1da177e4 LT |
3882 | |
3883 | spin_unlock_irq(&conf->device_lock); | |
3884 | ||
c9f21aaf | 3885 | async_tx_issue_pending_all(); |
1da177e4 LT |
3886 | unplug_slaves(mddev); |
3887 | ||
45b4233c | 3888 | pr_debug("--- raid5d inactive\n"); |
1da177e4 LT |
3889 | } |
3890 | ||
3f294f4f | 3891 | static ssize_t |
007583c9 | 3892 | raid5_show_stripe_cache_size(mddev_t *mddev, char *page) |
3f294f4f | 3893 | { |
007583c9 | 3894 | raid5_conf_t *conf = mddev_to_conf(mddev); |
96de1e66 N |
3895 | if (conf) |
3896 | return sprintf(page, "%d\n", conf->max_nr_stripes); | |
3897 | else | |
3898 | return 0; | |
3f294f4f N |
3899 | } |
3900 | ||
3901 | static ssize_t | |
007583c9 | 3902 | raid5_store_stripe_cache_size(mddev_t *mddev, const char *page, size_t len) |
3f294f4f | 3903 | { |
007583c9 | 3904 | raid5_conf_t *conf = mddev_to_conf(mddev); |
4ef197d8 | 3905 | unsigned long new; |
b5470dc5 DW |
3906 | int err; |
3907 | ||
3f294f4f N |
3908 | if (len >= PAGE_SIZE) |
3909 | return -EINVAL; | |
96de1e66 N |
3910 | if (!conf) |
3911 | return -ENODEV; | |
3f294f4f | 3912 | |
4ef197d8 | 3913 | if (strict_strtoul(page, 10, &new)) |
3f294f4f N |
3914 | return -EINVAL; |
3915 | if (new <= 16 || new > 32768) | |
3916 | return -EINVAL; | |
3917 | while (new < conf->max_nr_stripes) { | |
3918 | if (drop_one_stripe(conf)) | |
3919 | conf->max_nr_stripes--; | |
3920 | else | |
3921 | break; | |
3922 | } | |
b5470dc5 DW |
3923 | err = md_allow_write(mddev); |
3924 | if (err) | |
3925 | return err; | |
3f294f4f N |
3926 | while (new > conf->max_nr_stripes) { |
3927 | if (grow_one_stripe(conf)) | |
3928 | conf->max_nr_stripes++; | |
3929 | else break; | |
3930 | } | |
3931 | return len; | |
3932 | } | |
007583c9 | 3933 | |
96de1e66 N |
3934 | static struct md_sysfs_entry |
3935 | raid5_stripecache_size = __ATTR(stripe_cache_size, S_IRUGO | S_IWUSR, | |
3936 | raid5_show_stripe_cache_size, | |
3937 | raid5_store_stripe_cache_size); | |
3f294f4f | 3938 | |
8b3e6cdc DW |
3939 | static ssize_t |
3940 | raid5_show_preread_threshold(mddev_t *mddev, char *page) | |
3941 | { | |
3942 | raid5_conf_t *conf = mddev_to_conf(mddev); | |
3943 | if (conf) | |
3944 | return sprintf(page, "%d\n", conf->bypass_threshold); | |
3945 | else | |
3946 | return 0; | |
3947 | } | |
3948 | ||
3949 | static ssize_t | |
3950 | raid5_store_preread_threshold(mddev_t *mddev, const char *page, size_t len) | |
3951 | { | |
3952 | raid5_conf_t *conf = mddev_to_conf(mddev); | |
4ef197d8 | 3953 | unsigned long new; |
8b3e6cdc DW |
3954 | if (len >= PAGE_SIZE) |
3955 | return -EINVAL; | |
3956 | if (!conf) | |
3957 | return -ENODEV; | |
3958 | ||
4ef197d8 | 3959 | if (strict_strtoul(page, 10, &new)) |
8b3e6cdc | 3960 | return -EINVAL; |
4ef197d8 | 3961 | if (new > conf->max_nr_stripes) |
8b3e6cdc DW |
3962 | return -EINVAL; |
3963 | conf->bypass_threshold = new; | |
3964 | return len; | |
3965 | } | |
3966 | ||
3967 | static struct md_sysfs_entry | |
3968 | raid5_preread_bypass_threshold = __ATTR(preread_bypass_threshold, | |
3969 | S_IRUGO | S_IWUSR, | |
3970 | raid5_show_preread_threshold, | |
3971 | raid5_store_preread_threshold); | |
3972 | ||
3f294f4f | 3973 | static ssize_t |
96de1e66 | 3974 | stripe_cache_active_show(mddev_t *mddev, char *page) |
3f294f4f | 3975 | { |
007583c9 | 3976 | raid5_conf_t *conf = mddev_to_conf(mddev); |
96de1e66 N |
3977 | if (conf) |
3978 | return sprintf(page, "%d\n", atomic_read(&conf->active_stripes)); | |
3979 | else | |
3980 | return 0; | |
3f294f4f N |
3981 | } |
3982 | ||
96de1e66 N |
3983 | static struct md_sysfs_entry |
3984 | raid5_stripecache_active = __ATTR_RO(stripe_cache_active); | |
3f294f4f | 3985 | |
007583c9 | 3986 | static struct attribute *raid5_attrs[] = { |
3f294f4f N |
3987 | &raid5_stripecache_size.attr, |
3988 | &raid5_stripecache_active.attr, | |
8b3e6cdc | 3989 | &raid5_preread_bypass_threshold.attr, |
3f294f4f N |
3990 | NULL, |
3991 | }; | |
007583c9 N |
3992 | static struct attribute_group raid5_attrs_group = { |
3993 | .name = NULL, | |
3994 | .attrs = raid5_attrs, | |
3f294f4f N |
3995 | }; |
3996 | ||
72626685 | 3997 | static int run(mddev_t *mddev) |
1da177e4 LT |
3998 | { |
3999 | raid5_conf_t *conf; | |
4000 | int raid_disk, memory; | |
4001 | mdk_rdev_t *rdev; | |
4002 | struct disk_info *disk; | |
4003 | struct list_head *tmp; | |
02c2de8c | 4004 | int working_disks = 0; |
1da177e4 | 4005 | |
16a53ecc N |
4006 | if (mddev->level != 5 && mddev->level != 4 && mddev->level != 6) { |
4007 | printk(KERN_ERR "raid5: %s: raid level not set to 4/5/6 (%d)\n", | |
14f8d26b | 4008 | mdname(mddev), mddev->level); |
1da177e4 LT |
4009 | return -EIO; |
4010 | } | |
4011 | ||
f6705578 N |
4012 | if (mddev->reshape_position != MaxSector) { |
4013 | /* Check that we can continue the reshape. | |
4014 | * Currently only disks can change, it must | |
4015 | * increase, and we must be past the point where | |
4016 | * a stripe over-writes itself | |
4017 | */ | |
4018 | sector_t here_new, here_old; | |
4019 | int old_disks; | |
f416885e | 4020 | int max_degraded = (mddev->level == 5 ? 1 : 2); |
f6705578 N |
4021 | |
4022 | if (mddev->new_level != mddev->level || | |
4023 | mddev->new_layout != mddev->layout || | |
4024 | mddev->new_chunk != mddev->chunk_size) { | |
f416885e N |
4025 | printk(KERN_ERR "raid5: %s: unsupported reshape " |
4026 | "required - aborting.\n", | |
f6705578 N |
4027 | mdname(mddev)); |
4028 | return -EINVAL; | |
4029 | } | |
4030 | if (mddev->delta_disks <= 0) { | |
f416885e N |
4031 | printk(KERN_ERR "raid5: %s: unsupported reshape " |
4032 | "(reduce disks) required - aborting.\n", | |
f6705578 N |
4033 | mdname(mddev)); |
4034 | return -EINVAL; | |
4035 | } | |
4036 | old_disks = mddev->raid_disks - mddev->delta_disks; | |
4037 | /* reshape_position must be on a new-stripe boundary, and one | |
f416885e N |
4038 | * further up in new geometry must map after here in old |
4039 | * geometry. | |
f6705578 N |
4040 | */ |
4041 | here_new = mddev->reshape_position; | |
f416885e N |
4042 | if (sector_div(here_new, (mddev->chunk_size>>9)* |
4043 | (mddev->raid_disks - max_degraded))) { | |
4044 | printk(KERN_ERR "raid5: reshape_position not " | |
4045 | "on a stripe boundary\n"); | |
f6705578 N |
4046 | return -EINVAL; |
4047 | } | |
4048 | /* here_new is the stripe we will write to */ | |
4049 | here_old = mddev->reshape_position; | |
f416885e N |
4050 | sector_div(here_old, (mddev->chunk_size>>9)* |
4051 | (old_disks-max_degraded)); | |
4052 | /* here_old is the first stripe that we might need to read | |
4053 | * from */ | |
f6705578 N |
4054 | if (here_new >= here_old) { |
4055 | /* Reading from the same stripe as writing to - bad */ | |
f416885e N |
4056 | printk(KERN_ERR "raid5: reshape_position too early for " |
4057 | "auto-recovery - aborting.\n"); | |
f6705578 N |
4058 | return -EINVAL; |
4059 | } | |
4060 | printk(KERN_INFO "raid5: reshape will continue\n"); | |
4061 | /* OK, we should be able to continue; */ | |
4062 | } | |
4063 | ||
4064 | ||
b55e6bfc | 4065 | mddev->private = kzalloc(sizeof (raid5_conf_t), GFP_KERNEL); |
1da177e4 LT |
4066 | if ((conf = mddev->private) == NULL) |
4067 | goto abort; | |
f6705578 N |
4068 | if (mddev->reshape_position == MaxSector) { |
4069 | conf->previous_raid_disks = conf->raid_disks = mddev->raid_disks; | |
4070 | } else { | |
4071 | conf->raid_disks = mddev->raid_disks; | |
4072 | conf->previous_raid_disks = mddev->raid_disks - mddev->delta_disks; | |
4073 | } | |
4074 | ||
4075 | conf->disks = kzalloc(conf->raid_disks * sizeof(struct disk_info), | |
b55e6bfc N |
4076 | GFP_KERNEL); |
4077 | if (!conf->disks) | |
4078 | goto abort; | |
9ffae0cf | 4079 | |
1da177e4 LT |
4080 | conf->mddev = mddev; |
4081 | ||
fccddba0 | 4082 | if ((conf->stripe_hashtbl = kzalloc(PAGE_SIZE, GFP_KERNEL)) == NULL) |
1da177e4 | 4083 | goto abort; |
1da177e4 | 4084 | |
16a53ecc N |
4085 | if (mddev->level == 6) { |
4086 | conf->spare_page = alloc_page(GFP_KERNEL); | |
4087 | if (!conf->spare_page) | |
4088 | goto abort; | |
4089 | } | |
1da177e4 | 4090 | spin_lock_init(&conf->device_lock); |
e7e72bf6 | 4091 | mddev->queue->queue_lock = &conf->device_lock; |
1da177e4 LT |
4092 | init_waitqueue_head(&conf->wait_for_stripe); |
4093 | init_waitqueue_head(&conf->wait_for_overlap); | |
4094 | INIT_LIST_HEAD(&conf->handle_list); | |
8b3e6cdc | 4095 | INIT_LIST_HEAD(&conf->hold_list); |
1da177e4 | 4096 | INIT_LIST_HEAD(&conf->delayed_list); |
72626685 | 4097 | INIT_LIST_HEAD(&conf->bitmap_list); |
1da177e4 LT |
4098 | INIT_LIST_HEAD(&conf->inactive_list); |
4099 | atomic_set(&conf->active_stripes, 0); | |
4100 | atomic_set(&conf->preread_active_stripes, 0); | |
46031f9a | 4101 | atomic_set(&conf->active_aligned_reads, 0); |
8b3e6cdc | 4102 | conf->bypass_threshold = BYPASS_THRESHOLD; |
1da177e4 | 4103 | |
45b4233c | 4104 | pr_debug("raid5: run(%s) called.\n", mdname(mddev)); |
1da177e4 | 4105 | |
d089c6af | 4106 | rdev_for_each(rdev, tmp, mddev) { |
1da177e4 | 4107 | raid_disk = rdev->raid_disk; |
f6705578 | 4108 | if (raid_disk >= conf->raid_disks |
1da177e4 LT |
4109 | || raid_disk < 0) |
4110 | continue; | |
4111 | disk = conf->disks + raid_disk; | |
4112 | ||
4113 | disk->rdev = rdev; | |
4114 | ||
b2d444d7 | 4115 | if (test_bit(In_sync, &rdev->flags)) { |
1da177e4 LT |
4116 | char b[BDEVNAME_SIZE]; |
4117 | printk(KERN_INFO "raid5: device %s operational as raid" | |
4118 | " disk %d\n", bdevname(rdev->bdev,b), | |
4119 | raid_disk); | |
02c2de8c | 4120 | working_disks++; |
8c2e870a NB |
4121 | } else |
4122 | /* Cannot rely on bitmap to complete recovery */ | |
4123 | conf->fullsync = 1; | |
1da177e4 LT |
4124 | } |
4125 | ||
1da177e4 | 4126 | /* |
16a53ecc | 4127 | * 0 for a fully functional array, 1 or 2 for a degraded array. |
1da177e4 | 4128 | */ |
02c2de8c | 4129 | mddev->degraded = conf->raid_disks - working_disks; |
1da177e4 LT |
4130 | conf->mddev = mddev; |
4131 | conf->chunk_size = mddev->chunk_size; | |
4132 | conf->level = mddev->level; | |
16a53ecc N |
4133 | if (conf->level == 6) |
4134 | conf->max_degraded = 2; | |
4135 | else | |
4136 | conf->max_degraded = 1; | |
1da177e4 LT |
4137 | conf->algorithm = mddev->layout; |
4138 | conf->max_nr_stripes = NR_STRIPES; | |
f6705578 | 4139 | conf->expand_progress = mddev->reshape_position; |
1da177e4 LT |
4140 | |
4141 | /* device size must be a multiple of chunk size */ | |
4142 | mddev->size &= ~(mddev->chunk_size/1024 -1); | |
b1581566 | 4143 | mddev->resync_max_sectors = mddev->size << 1; |
1da177e4 | 4144 | |
16a53ecc N |
4145 | if (conf->level == 6 && conf->raid_disks < 4) { |
4146 | printk(KERN_ERR "raid6: not enough configured devices for %s (%d, minimum 4)\n", | |
4147 | mdname(mddev), conf->raid_disks); | |
4148 | goto abort; | |
4149 | } | |
1da177e4 LT |
4150 | if (!conf->chunk_size || conf->chunk_size % 4) { |
4151 | printk(KERN_ERR "raid5: invalid chunk size %d for %s\n", | |
4152 | conf->chunk_size, mdname(mddev)); | |
4153 | goto abort; | |
4154 | } | |
4155 | if (conf->algorithm > ALGORITHM_RIGHT_SYMMETRIC) { | |
4156 | printk(KERN_ERR | |
4157 | "raid5: unsupported parity algorithm %d for %s\n", | |
4158 | conf->algorithm, mdname(mddev)); | |
4159 | goto abort; | |
4160 | } | |
16a53ecc | 4161 | if (mddev->degraded > conf->max_degraded) { |
1da177e4 LT |
4162 | printk(KERN_ERR "raid5: not enough operational devices for %s" |
4163 | " (%d/%d failed)\n", | |
02c2de8c | 4164 | mdname(mddev), mddev->degraded, conf->raid_disks); |
1da177e4 LT |
4165 | goto abort; |
4166 | } | |
4167 | ||
16a53ecc | 4168 | if (mddev->degraded > 0 && |
1da177e4 | 4169 | mddev->recovery_cp != MaxSector) { |
6ff8d8ec N |
4170 | if (mddev->ok_start_degraded) |
4171 | printk(KERN_WARNING | |
4172 | "raid5: starting dirty degraded array: %s" | |
4173 | "- data corruption possible.\n", | |
4174 | mdname(mddev)); | |
4175 | else { | |
4176 | printk(KERN_ERR | |
4177 | "raid5: cannot start dirty degraded array for %s\n", | |
4178 | mdname(mddev)); | |
4179 | goto abort; | |
4180 | } | |
1da177e4 LT |
4181 | } |
4182 | ||
4183 | { | |
4184 | mddev->thread = md_register_thread(raid5d, mddev, "%s_raid5"); | |
4185 | if (!mddev->thread) { | |
4186 | printk(KERN_ERR | |
4187 | "raid5: couldn't allocate thread for %s\n", | |
4188 | mdname(mddev)); | |
4189 | goto abort; | |
4190 | } | |
4191 | } | |
5036805b | 4192 | memory = conf->max_nr_stripes * (sizeof(struct stripe_head) + |
1da177e4 LT |
4193 | conf->raid_disks * ((sizeof(struct bio) + PAGE_SIZE))) / 1024; |
4194 | if (grow_stripes(conf, conf->max_nr_stripes)) { | |
4195 | printk(KERN_ERR | |
4196 | "raid5: couldn't allocate %dkB for buffers\n", memory); | |
4197 | shrink_stripes(conf); | |
4198 | md_unregister_thread(mddev->thread); | |
4199 | goto abort; | |
4200 | } else | |
4201 | printk(KERN_INFO "raid5: allocated %dkB for %s\n", | |
4202 | memory, mdname(mddev)); | |
4203 | ||
4204 | if (mddev->degraded == 0) | |
4205 | printk("raid5: raid level %d set %s active with %d out of %d" | |
4206 | " devices, algorithm %d\n", conf->level, mdname(mddev), | |
4207 | mddev->raid_disks-mddev->degraded, mddev->raid_disks, | |
4208 | conf->algorithm); | |
4209 | else | |
4210 | printk(KERN_ALERT "raid5: raid level %d set %s active with %d" | |
4211 | " out of %d devices, algorithm %d\n", conf->level, | |
4212 | mdname(mddev), mddev->raid_disks - mddev->degraded, | |
4213 | mddev->raid_disks, conf->algorithm); | |
4214 | ||
4215 | print_raid5_conf(conf); | |
4216 | ||
f6705578 N |
4217 | if (conf->expand_progress != MaxSector) { |
4218 | printk("...ok start reshape thread\n"); | |
b578d55f | 4219 | conf->expand_lo = conf->expand_progress; |
f6705578 N |
4220 | atomic_set(&conf->reshape_stripes, 0); |
4221 | clear_bit(MD_RECOVERY_SYNC, &mddev->recovery); | |
4222 | clear_bit(MD_RECOVERY_CHECK, &mddev->recovery); | |
4223 | set_bit(MD_RECOVERY_RESHAPE, &mddev->recovery); | |
4224 | set_bit(MD_RECOVERY_RUNNING, &mddev->recovery); | |
4225 | mddev->sync_thread = md_register_thread(md_do_sync, mddev, | |
4226 | "%s_reshape"); | |
f6705578 N |
4227 | } |
4228 | ||
1da177e4 | 4229 | /* read-ahead size must cover two whole stripes, which is |
16a53ecc | 4230 | * 2 * (datadisks) * chunksize where 'n' is the number of raid devices |
1da177e4 LT |
4231 | */ |
4232 | { | |
16a53ecc N |
4233 | int data_disks = conf->previous_raid_disks - conf->max_degraded; |
4234 | int stripe = data_disks * | |
8932c2e0 | 4235 | (mddev->chunk_size / PAGE_SIZE); |
1da177e4 LT |
4236 | if (mddev->queue->backing_dev_info.ra_pages < 2 * stripe) |
4237 | mddev->queue->backing_dev_info.ra_pages = 2 * stripe; | |
4238 | } | |
4239 | ||
4240 | /* Ok, everything is just fine now */ | |
5e55e2f5 N |
4241 | if (sysfs_create_group(&mddev->kobj, &raid5_attrs_group)) |
4242 | printk(KERN_WARNING | |
4243 | "raid5: failed to create sysfs attributes for %s\n", | |
4244 | mdname(mddev)); | |
7a5febe9 N |
4245 | |
4246 | mddev->queue->unplug_fn = raid5_unplug_device; | |
f022b2fd | 4247 | mddev->queue->backing_dev_info.congested_data = mddev; |
041ae52e | 4248 | mddev->queue->backing_dev_info.congested_fn = raid5_congested; |
f022b2fd | 4249 | |
f233ea5c | 4250 | mddev->array_sectors = 2 * mddev->size * (conf->previous_raid_disks - |
16a53ecc | 4251 | conf->max_degraded); |
7a5febe9 | 4252 | |
23032a0e RBJ |
4253 | blk_queue_merge_bvec(mddev->queue, raid5_mergeable_bvec); |
4254 | ||
1da177e4 LT |
4255 | return 0; |
4256 | abort: | |
4257 | if (conf) { | |
4258 | print_raid5_conf(conf); | |
16a53ecc | 4259 | safe_put_page(conf->spare_page); |
b55e6bfc | 4260 | kfree(conf->disks); |
fccddba0 | 4261 | kfree(conf->stripe_hashtbl); |
1da177e4 LT |
4262 | kfree(conf); |
4263 | } | |
4264 | mddev->private = NULL; | |
4265 | printk(KERN_ALERT "raid5: failed to run raid set %s\n", mdname(mddev)); | |
4266 | return -EIO; | |
4267 | } | |
4268 | ||
4269 | ||
4270 | ||
3f294f4f | 4271 | static int stop(mddev_t *mddev) |
1da177e4 LT |
4272 | { |
4273 | raid5_conf_t *conf = (raid5_conf_t *) mddev->private; | |
4274 | ||
4275 | md_unregister_thread(mddev->thread); | |
4276 | mddev->thread = NULL; | |
4277 | shrink_stripes(conf); | |
fccddba0 | 4278 | kfree(conf->stripe_hashtbl); |
041ae52e | 4279 | mddev->queue->backing_dev_info.congested_fn = NULL; |
1da177e4 | 4280 | blk_sync_queue(mddev->queue); /* the unplug fn references 'conf'*/ |
007583c9 | 4281 | sysfs_remove_group(&mddev->kobj, &raid5_attrs_group); |
b55e6bfc | 4282 | kfree(conf->disks); |
96de1e66 | 4283 | kfree(conf); |
1da177e4 LT |
4284 | mddev->private = NULL; |
4285 | return 0; | |
4286 | } | |
4287 | ||
45b4233c | 4288 | #ifdef DEBUG |
16a53ecc | 4289 | static void print_sh (struct seq_file *seq, struct stripe_head *sh) |
1da177e4 LT |
4290 | { |
4291 | int i; | |
4292 | ||
16a53ecc N |
4293 | seq_printf(seq, "sh %llu, pd_idx %d, state %ld.\n", |
4294 | (unsigned long long)sh->sector, sh->pd_idx, sh->state); | |
4295 | seq_printf(seq, "sh %llu, count %d.\n", | |
4296 | (unsigned long long)sh->sector, atomic_read(&sh->count)); | |
4297 | seq_printf(seq, "sh %llu, ", (unsigned long long)sh->sector); | |
7ecaa1e6 | 4298 | for (i = 0; i < sh->disks; i++) { |
16a53ecc N |
4299 | seq_printf(seq, "(cache%d: %p %ld) ", |
4300 | i, sh->dev[i].page, sh->dev[i].flags); | |
1da177e4 | 4301 | } |
16a53ecc | 4302 | seq_printf(seq, "\n"); |
1da177e4 LT |
4303 | } |
4304 | ||
16a53ecc | 4305 | static void printall (struct seq_file *seq, raid5_conf_t *conf) |
1da177e4 LT |
4306 | { |
4307 | struct stripe_head *sh; | |
fccddba0 | 4308 | struct hlist_node *hn; |
1da177e4 LT |
4309 | int i; |
4310 | ||
4311 | spin_lock_irq(&conf->device_lock); | |
4312 | for (i = 0; i < NR_HASH; i++) { | |
fccddba0 | 4313 | hlist_for_each_entry(sh, hn, &conf->stripe_hashtbl[i], hash) { |
1da177e4 LT |
4314 | if (sh->raid_conf != conf) |
4315 | continue; | |
16a53ecc | 4316 | print_sh(seq, sh); |
1da177e4 LT |
4317 | } |
4318 | } | |
4319 | spin_unlock_irq(&conf->device_lock); | |
4320 | } | |
4321 | #endif | |
4322 | ||
4323 | static void status (struct seq_file *seq, mddev_t *mddev) | |
4324 | { | |
4325 | raid5_conf_t *conf = (raid5_conf_t *) mddev->private; | |
4326 | int i; | |
4327 | ||
4328 | seq_printf (seq, " level %d, %dk chunk, algorithm %d", mddev->level, mddev->chunk_size >> 10, mddev->layout); | |
02c2de8c | 4329 | seq_printf (seq, " [%d/%d] [", conf->raid_disks, conf->raid_disks - mddev->degraded); |
1da177e4 LT |
4330 | for (i = 0; i < conf->raid_disks; i++) |
4331 | seq_printf (seq, "%s", | |
4332 | conf->disks[i].rdev && | |
b2d444d7 | 4333 | test_bit(In_sync, &conf->disks[i].rdev->flags) ? "U" : "_"); |
1da177e4 | 4334 | seq_printf (seq, "]"); |
45b4233c | 4335 | #ifdef DEBUG |
16a53ecc N |
4336 | seq_printf (seq, "\n"); |
4337 | printall(seq, conf); | |
1da177e4 LT |
4338 | #endif |
4339 | } | |
4340 | ||
4341 | static void print_raid5_conf (raid5_conf_t *conf) | |
4342 | { | |
4343 | int i; | |
4344 | struct disk_info *tmp; | |
4345 | ||
4346 | printk("RAID5 conf printout:\n"); | |
4347 | if (!conf) { | |
4348 | printk("(conf==NULL)\n"); | |
4349 | return; | |
4350 | } | |
02c2de8c N |
4351 | printk(" --- rd:%d wd:%d\n", conf->raid_disks, |
4352 | conf->raid_disks - conf->mddev->degraded); | |
1da177e4 LT |
4353 | |
4354 | for (i = 0; i < conf->raid_disks; i++) { | |
4355 | char b[BDEVNAME_SIZE]; | |
4356 | tmp = conf->disks + i; | |
4357 | if (tmp->rdev) | |
4358 | printk(" disk %d, o:%d, dev:%s\n", | |
b2d444d7 | 4359 | i, !test_bit(Faulty, &tmp->rdev->flags), |
1da177e4 LT |
4360 | bdevname(tmp->rdev->bdev,b)); |
4361 | } | |
4362 | } | |
4363 | ||
4364 | static int raid5_spare_active(mddev_t *mddev) | |
4365 | { | |
4366 | int i; | |
4367 | raid5_conf_t *conf = mddev->private; | |
4368 | struct disk_info *tmp; | |
4369 | ||
4370 | for (i = 0; i < conf->raid_disks; i++) { | |
4371 | tmp = conf->disks + i; | |
4372 | if (tmp->rdev | |
b2d444d7 | 4373 | && !test_bit(Faulty, &tmp->rdev->flags) |
c04be0aa N |
4374 | && !test_and_set_bit(In_sync, &tmp->rdev->flags)) { |
4375 | unsigned long flags; | |
4376 | spin_lock_irqsave(&conf->device_lock, flags); | |
1da177e4 | 4377 | mddev->degraded--; |
c04be0aa | 4378 | spin_unlock_irqrestore(&conf->device_lock, flags); |
1da177e4 LT |
4379 | } |
4380 | } | |
4381 | print_raid5_conf(conf); | |
4382 | return 0; | |
4383 | } | |
4384 | ||
4385 | static int raid5_remove_disk(mddev_t *mddev, int number) | |
4386 | { | |
4387 | raid5_conf_t *conf = mddev->private; | |
4388 | int err = 0; | |
4389 | mdk_rdev_t *rdev; | |
4390 | struct disk_info *p = conf->disks + number; | |
4391 | ||
4392 | print_raid5_conf(conf); | |
4393 | rdev = p->rdev; | |
4394 | if (rdev) { | |
b2d444d7 | 4395 | if (test_bit(In_sync, &rdev->flags) || |
1da177e4 LT |
4396 | atomic_read(&rdev->nr_pending)) { |
4397 | err = -EBUSY; | |
4398 | goto abort; | |
4399 | } | |
dfc70645 N |
4400 | /* Only remove non-faulty devices if recovery |
4401 | * isn't possible. | |
4402 | */ | |
4403 | if (!test_bit(Faulty, &rdev->flags) && | |
4404 | mddev->degraded <= conf->max_degraded) { | |
4405 | err = -EBUSY; | |
4406 | goto abort; | |
4407 | } | |
1da177e4 | 4408 | p->rdev = NULL; |
fbd568a3 | 4409 | synchronize_rcu(); |
1da177e4 LT |
4410 | if (atomic_read(&rdev->nr_pending)) { |
4411 | /* lost the race, try later */ | |
4412 | err = -EBUSY; | |
4413 | p->rdev = rdev; | |
4414 | } | |
4415 | } | |
4416 | abort: | |
4417 | ||
4418 | print_raid5_conf(conf); | |
4419 | return err; | |
4420 | } | |
4421 | ||
4422 | static int raid5_add_disk(mddev_t *mddev, mdk_rdev_t *rdev) | |
4423 | { | |
4424 | raid5_conf_t *conf = mddev->private; | |
199050ea | 4425 | int err = -EEXIST; |
1da177e4 LT |
4426 | int disk; |
4427 | struct disk_info *p; | |
6c2fce2e NB |
4428 | int first = 0; |
4429 | int last = conf->raid_disks - 1; | |
1da177e4 | 4430 | |
16a53ecc | 4431 | if (mddev->degraded > conf->max_degraded) |
1da177e4 | 4432 | /* no point adding a device */ |
199050ea | 4433 | return -EINVAL; |
1da177e4 | 4434 | |
6c2fce2e NB |
4435 | if (rdev->raid_disk >= 0) |
4436 | first = last = rdev->raid_disk; | |
1da177e4 LT |
4437 | |
4438 | /* | |
16a53ecc N |
4439 | * find the disk ... but prefer rdev->saved_raid_disk |
4440 | * if possible. | |
1da177e4 | 4441 | */ |
16a53ecc | 4442 | if (rdev->saved_raid_disk >= 0 && |
6c2fce2e | 4443 | rdev->saved_raid_disk >= first && |
16a53ecc N |
4444 | conf->disks[rdev->saved_raid_disk].rdev == NULL) |
4445 | disk = rdev->saved_raid_disk; | |
4446 | else | |
6c2fce2e NB |
4447 | disk = first; |
4448 | for ( ; disk <= last ; disk++) | |
1da177e4 | 4449 | if ((p=conf->disks + disk)->rdev == NULL) { |
b2d444d7 | 4450 | clear_bit(In_sync, &rdev->flags); |
1da177e4 | 4451 | rdev->raid_disk = disk; |
199050ea | 4452 | err = 0; |
72626685 N |
4453 | if (rdev->saved_raid_disk != disk) |
4454 | conf->fullsync = 1; | |
d6065f7b | 4455 | rcu_assign_pointer(p->rdev, rdev); |
1da177e4 LT |
4456 | break; |
4457 | } | |
4458 | print_raid5_conf(conf); | |
199050ea | 4459 | return err; |
1da177e4 LT |
4460 | } |
4461 | ||
4462 | static int raid5_resize(mddev_t *mddev, sector_t sectors) | |
4463 | { | |
4464 | /* no resync is happening, and there is enough space | |
4465 | * on all devices, so we can resize. | |
4466 | * We need to make sure resync covers any new space. | |
4467 | * If the array is shrinking we should possibly wait until | |
4468 | * any io in the removed space completes, but it hardly seems | |
4469 | * worth it. | |
4470 | */ | |
16a53ecc N |
4471 | raid5_conf_t *conf = mddev_to_conf(mddev); |
4472 | ||
1da177e4 | 4473 | sectors &= ~((sector_t)mddev->chunk_size/512 - 1); |
f233ea5c AN |
4474 | mddev->array_sectors = sectors * (mddev->raid_disks |
4475 | - conf->max_degraded); | |
4476 | set_capacity(mddev->gendisk, mddev->array_sectors); | |
44ce6294 | 4477 | mddev->changed = 1; |
1da177e4 LT |
4478 | if (sectors/2 > mddev->size && mddev->recovery_cp == MaxSector) { |
4479 | mddev->recovery_cp = mddev->size << 1; | |
4480 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
4481 | } | |
4482 | mddev->size = sectors /2; | |
4b5c7ae8 | 4483 | mddev->resync_max_sectors = sectors; |
1da177e4 LT |
4484 | return 0; |
4485 | } | |
4486 | ||
29269553 | 4487 | #ifdef CONFIG_MD_RAID5_RESHAPE |
63c70c4f | 4488 | static int raid5_check_reshape(mddev_t *mddev) |
29269553 N |
4489 | { |
4490 | raid5_conf_t *conf = mddev_to_conf(mddev); | |
4491 | int err; | |
29269553 | 4492 | |
63c70c4f N |
4493 | if (mddev->delta_disks < 0 || |
4494 | mddev->new_level != mddev->level) | |
4495 | return -EINVAL; /* Cannot shrink array or change level yet */ | |
4496 | if (mddev->delta_disks == 0) | |
29269553 | 4497 | return 0; /* nothing to do */ |
dba034ee N |
4498 | if (mddev->bitmap) |
4499 | /* Cannot grow a bitmap yet */ | |
4500 | return -EBUSY; | |
29269553 N |
4501 | |
4502 | /* Can only proceed if there are plenty of stripe_heads. | |
4503 | * We need a minimum of one full stripe,, and for sensible progress | |
4504 | * it is best to have about 4 times that. | |
4505 | * If we require 4 times, then the default 256 4K stripe_heads will | |
4506 | * allow for chunk sizes up to 256K, which is probably OK. | |
4507 | * If the chunk size is greater, user-space should request more | |
4508 | * stripe_heads first. | |
4509 | */ | |
63c70c4f N |
4510 | if ((mddev->chunk_size / STRIPE_SIZE) * 4 > conf->max_nr_stripes || |
4511 | (mddev->new_chunk / STRIPE_SIZE) * 4 > conf->max_nr_stripes) { | |
29269553 N |
4512 | printk(KERN_WARNING "raid5: reshape: not enough stripes. Needed %lu\n", |
4513 | (mddev->chunk_size / STRIPE_SIZE)*4); | |
4514 | return -ENOSPC; | |
4515 | } | |
4516 | ||
63c70c4f N |
4517 | err = resize_stripes(conf, conf->raid_disks + mddev->delta_disks); |
4518 | if (err) | |
4519 | return err; | |
4520 | ||
b4c4c7b8 N |
4521 | if (mddev->degraded > conf->max_degraded) |
4522 | return -EINVAL; | |
63c70c4f N |
4523 | /* looks like we might be able to manage this */ |
4524 | return 0; | |
4525 | } | |
4526 | ||
4527 | static int raid5_start_reshape(mddev_t *mddev) | |
4528 | { | |
4529 | raid5_conf_t *conf = mddev_to_conf(mddev); | |
4530 | mdk_rdev_t *rdev; | |
4531 | struct list_head *rtmp; | |
4532 | int spares = 0; | |
4533 | int added_devices = 0; | |
c04be0aa | 4534 | unsigned long flags; |
63c70c4f | 4535 | |
f416885e | 4536 | if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) |
63c70c4f N |
4537 | return -EBUSY; |
4538 | ||
d089c6af | 4539 | rdev_for_each(rdev, rtmp, mddev) |
29269553 N |
4540 | if (rdev->raid_disk < 0 && |
4541 | !test_bit(Faulty, &rdev->flags)) | |
4542 | spares++; | |
63c70c4f | 4543 | |
f416885e | 4544 | if (spares - mddev->degraded < mddev->delta_disks - conf->max_degraded) |
29269553 N |
4545 | /* Not enough devices even to make a degraded array |
4546 | * of that size | |
4547 | */ | |
4548 | return -EINVAL; | |
4549 | ||
f6705578 | 4550 | atomic_set(&conf->reshape_stripes, 0); |
29269553 N |
4551 | spin_lock_irq(&conf->device_lock); |
4552 | conf->previous_raid_disks = conf->raid_disks; | |
63c70c4f | 4553 | conf->raid_disks += mddev->delta_disks; |
29269553 | 4554 | conf->expand_progress = 0; |
b578d55f | 4555 | conf->expand_lo = 0; |
29269553 N |
4556 | spin_unlock_irq(&conf->device_lock); |
4557 | ||
4558 | /* Add some new drives, as many as will fit. | |
4559 | * We know there are enough to make the newly sized array work. | |
4560 | */ | |
d089c6af | 4561 | rdev_for_each(rdev, rtmp, mddev) |
29269553 N |
4562 | if (rdev->raid_disk < 0 && |
4563 | !test_bit(Faulty, &rdev->flags)) { | |
199050ea | 4564 | if (raid5_add_disk(mddev, rdev) == 0) { |
29269553 N |
4565 | char nm[20]; |
4566 | set_bit(In_sync, &rdev->flags); | |
29269553 | 4567 | added_devices++; |
5fd6c1dc | 4568 | rdev->recovery_offset = 0; |
29269553 | 4569 | sprintf(nm, "rd%d", rdev->raid_disk); |
5e55e2f5 N |
4570 | if (sysfs_create_link(&mddev->kobj, |
4571 | &rdev->kobj, nm)) | |
4572 | printk(KERN_WARNING | |
4573 | "raid5: failed to create " | |
4574 | " link %s for %s\n", | |
4575 | nm, mdname(mddev)); | |
29269553 N |
4576 | } else |
4577 | break; | |
4578 | } | |
4579 | ||
c04be0aa | 4580 | spin_lock_irqsave(&conf->device_lock, flags); |
63c70c4f | 4581 | mddev->degraded = (conf->raid_disks - conf->previous_raid_disks) - added_devices; |
c04be0aa | 4582 | spin_unlock_irqrestore(&conf->device_lock, flags); |
63c70c4f | 4583 | mddev->raid_disks = conf->raid_disks; |
f6705578 | 4584 | mddev->reshape_position = 0; |
850b2b42 | 4585 | set_bit(MD_CHANGE_DEVS, &mddev->flags); |
f6705578 | 4586 | |
29269553 N |
4587 | clear_bit(MD_RECOVERY_SYNC, &mddev->recovery); |
4588 | clear_bit(MD_RECOVERY_CHECK, &mddev->recovery); | |
4589 | set_bit(MD_RECOVERY_RESHAPE, &mddev->recovery); | |
4590 | set_bit(MD_RECOVERY_RUNNING, &mddev->recovery); | |
4591 | mddev->sync_thread = md_register_thread(md_do_sync, mddev, | |
4592 | "%s_reshape"); | |
4593 | if (!mddev->sync_thread) { | |
4594 | mddev->recovery = 0; | |
4595 | spin_lock_irq(&conf->device_lock); | |
4596 | mddev->raid_disks = conf->raid_disks = conf->previous_raid_disks; | |
4597 | conf->expand_progress = MaxSector; | |
4598 | spin_unlock_irq(&conf->device_lock); | |
4599 | return -EAGAIN; | |
4600 | } | |
4601 | md_wakeup_thread(mddev->sync_thread); | |
4602 | md_new_event(mddev); | |
4603 | return 0; | |
4604 | } | |
4605 | #endif | |
4606 | ||
4607 | static void end_reshape(raid5_conf_t *conf) | |
4608 | { | |
4609 | struct block_device *bdev; | |
4610 | ||
f6705578 | 4611 | if (!test_bit(MD_RECOVERY_INTR, &conf->mddev->recovery)) { |
f233ea5c | 4612 | conf->mddev->array_sectors = 2 * conf->mddev->size * |
f416885e | 4613 | (conf->raid_disks - conf->max_degraded); |
f233ea5c | 4614 | set_capacity(conf->mddev->gendisk, conf->mddev->array_sectors); |
44ce6294 | 4615 | conf->mddev->changed = 1; |
f6705578 N |
4616 | |
4617 | bdev = bdget_disk(conf->mddev->gendisk, 0); | |
4618 | if (bdev) { | |
4619 | mutex_lock(&bdev->bd_inode->i_mutex); | |
f233ea5c AN |
4620 | i_size_write(bdev->bd_inode, |
4621 | (loff_t)conf->mddev->array_sectors << 9); | |
f6705578 N |
4622 | mutex_unlock(&bdev->bd_inode->i_mutex); |
4623 | bdput(bdev); | |
4624 | } | |
4625 | spin_lock_irq(&conf->device_lock); | |
4626 | conf->expand_progress = MaxSector; | |
4627 | spin_unlock_irq(&conf->device_lock); | |
4628 | conf->mddev->reshape_position = MaxSector; | |
16a53ecc N |
4629 | |
4630 | /* read-ahead size must cover two whole stripes, which is | |
4631 | * 2 * (datadisks) * chunksize where 'n' is the number of raid devices | |
4632 | */ | |
4633 | { | |
4634 | int data_disks = conf->previous_raid_disks - conf->max_degraded; | |
4635 | int stripe = data_disks * | |
4636 | (conf->mddev->chunk_size / PAGE_SIZE); | |
4637 | if (conf->mddev->queue->backing_dev_info.ra_pages < 2 * stripe) | |
4638 | conf->mddev->queue->backing_dev_info.ra_pages = 2 * stripe; | |
4639 | } | |
29269553 | 4640 | } |
29269553 N |
4641 | } |
4642 | ||
72626685 N |
4643 | static void raid5_quiesce(mddev_t *mddev, int state) |
4644 | { | |
4645 | raid5_conf_t *conf = mddev_to_conf(mddev); | |
4646 | ||
4647 | switch(state) { | |
e464eafd N |
4648 | case 2: /* resume for a suspend */ |
4649 | wake_up(&conf->wait_for_overlap); | |
4650 | break; | |
4651 | ||
72626685 N |
4652 | case 1: /* stop all writes */ |
4653 | spin_lock_irq(&conf->device_lock); | |
4654 | conf->quiesce = 1; | |
4655 | wait_event_lock_irq(conf->wait_for_stripe, | |
46031f9a RBJ |
4656 | atomic_read(&conf->active_stripes) == 0 && |
4657 | atomic_read(&conf->active_aligned_reads) == 0, | |
72626685 N |
4658 | conf->device_lock, /* nothing */); |
4659 | spin_unlock_irq(&conf->device_lock); | |
4660 | break; | |
4661 | ||
4662 | case 0: /* re-enable writes */ | |
4663 | spin_lock_irq(&conf->device_lock); | |
4664 | conf->quiesce = 0; | |
4665 | wake_up(&conf->wait_for_stripe); | |
e464eafd | 4666 | wake_up(&conf->wait_for_overlap); |
72626685 N |
4667 | spin_unlock_irq(&conf->device_lock); |
4668 | break; | |
4669 | } | |
72626685 | 4670 | } |
b15c2e57 | 4671 | |
16a53ecc N |
4672 | static struct mdk_personality raid6_personality = |
4673 | { | |
4674 | .name = "raid6", | |
4675 | .level = 6, | |
4676 | .owner = THIS_MODULE, | |
4677 | .make_request = make_request, | |
4678 | .run = run, | |
4679 | .stop = stop, | |
4680 | .status = status, | |
4681 | .error_handler = error, | |
4682 | .hot_add_disk = raid5_add_disk, | |
4683 | .hot_remove_disk= raid5_remove_disk, | |
4684 | .spare_active = raid5_spare_active, | |
4685 | .sync_request = sync_request, | |
4686 | .resize = raid5_resize, | |
f416885e N |
4687 | #ifdef CONFIG_MD_RAID5_RESHAPE |
4688 | .check_reshape = raid5_check_reshape, | |
4689 | .start_reshape = raid5_start_reshape, | |
4690 | #endif | |
16a53ecc N |
4691 | .quiesce = raid5_quiesce, |
4692 | }; | |
2604b703 | 4693 | static struct mdk_personality raid5_personality = |
1da177e4 LT |
4694 | { |
4695 | .name = "raid5", | |
2604b703 | 4696 | .level = 5, |
1da177e4 LT |
4697 | .owner = THIS_MODULE, |
4698 | .make_request = make_request, | |
4699 | .run = run, | |
4700 | .stop = stop, | |
4701 | .status = status, | |
4702 | .error_handler = error, | |
4703 | .hot_add_disk = raid5_add_disk, | |
4704 | .hot_remove_disk= raid5_remove_disk, | |
4705 | .spare_active = raid5_spare_active, | |
4706 | .sync_request = sync_request, | |
4707 | .resize = raid5_resize, | |
29269553 | 4708 | #ifdef CONFIG_MD_RAID5_RESHAPE |
63c70c4f N |
4709 | .check_reshape = raid5_check_reshape, |
4710 | .start_reshape = raid5_start_reshape, | |
29269553 | 4711 | #endif |
72626685 | 4712 | .quiesce = raid5_quiesce, |
1da177e4 LT |
4713 | }; |
4714 | ||
2604b703 | 4715 | static struct mdk_personality raid4_personality = |
1da177e4 | 4716 | { |
2604b703 N |
4717 | .name = "raid4", |
4718 | .level = 4, | |
4719 | .owner = THIS_MODULE, | |
4720 | .make_request = make_request, | |
4721 | .run = run, | |
4722 | .stop = stop, | |
4723 | .status = status, | |
4724 | .error_handler = error, | |
4725 | .hot_add_disk = raid5_add_disk, | |
4726 | .hot_remove_disk= raid5_remove_disk, | |
4727 | .spare_active = raid5_spare_active, | |
4728 | .sync_request = sync_request, | |
4729 | .resize = raid5_resize, | |
3d37890b N |
4730 | #ifdef CONFIG_MD_RAID5_RESHAPE |
4731 | .check_reshape = raid5_check_reshape, | |
4732 | .start_reshape = raid5_start_reshape, | |
4733 | #endif | |
2604b703 N |
4734 | .quiesce = raid5_quiesce, |
4735 | }; | |
4736 | ||
4737 | static int __init raid5_init(void) | |
4738 | { | |
16a53ecc N |
4739 | int e; |
4740 | ||
4741 | e = raid6_select_algo(); | |
4742 | if ( e ) | |
4743 | return e; | |
4744 | register_md_personality(&raid6_personality); | |
2604b703 N |
4745 | register_md_personality(&raid5_personality); |
4746 | register_md_personality(&raid4_personality); | |
4747 | return 0; | |
1da177e4 LT |
4748 | } |
4749 | ||
2604b703 | 4750 | static void raid5_exit(void) |
1da177e4 | 4751 | { |
16a53ecc | 4752 | unregister_md_personality(&raid6_personality); |
2604b703 N |
4753 | unregister_md_personality(&raid5_personality); |
4754 | unregister_md_personality(&raid4_personality); | |
1da177e4 LT |
4755 | } |
4756 | ||
4757 | module_init(raid5_init); | |
4758 | module_exit(raid5_exit); | |
4759 | MODULE_LICENSE("GPL"); | |
4760 | MODULE_ALIAS("md-personality-4"); /* RAID5 */ | |
d9d166c2 N |
4761 | MODULE_ALIAS("md-raid5"); |
4762 | MODULE_ALIAS("md-raid4"); | |
2604b703 N |
4763 | MODULE_ALIAS("md-level-5"); |
4764 | MODULE_ALIAS("md-level-4"); | |
16a53ecc N |
4765 | MODULE_ALIAS("md-personality-8"); /* RAID6 */ |
4766 | MODULE_ALIAS("md-raid6"); | |
4767 | MODULE_ALIAS("md-level-6"); | |
4768 | ||
4769 | /* This used to be two separate modules, they were: */ | |
4770 | MODULE_ALIAS("raid5"); | |
4771 | MODULE_ALIAS("raid6"); |