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1da177e4 LT |
1 | /* |
2 | * raid10.c : Multiple Devices driver for Linux | |
3 | * | |
4 | * Copyright (C) 2000-2004 Neil Brown | |
5 | * | |
6 | * RAID-10 support for md. | |
7 | * | |
25985edc | 8 | * Base on code in raid1.c. See raid1.c for further copyright information. |
1da177e4 LT |
9 | * |
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 | ||
5a0e3ad6 | 21 | #include <linux/slab.h> |
25570727 | 22 | #include <linux/delay.h> |
bff61975 | 23 | #include <linux/blkdev.h> |
bff61975 | 24 | #include <linux/seq_file.h> |
8bda470e | 25 | #include <linux/ratelimit.h> |
43b2e5d8 | 26 | #include "md.h" |
ef740c37 | 27 | #include "raid10.h" |
dab8b292 | 28 | #include "raid0.h" |
ef740c37 | 29 | #include "bitmap.h" |
1da177e4 LT |
30 | |
31 | /* | |
32 | * RAID10 provides a combination of RAID0 and RAID1 functionality. | |
33 | * The layout of data is defined by | |
34 | * chunk_size | |
35 | * raid_disks | |
36 | * near_copies (stored in low byte of layout) | |
37 | * far_copies (stored in second byte of layout) | |
c93983bf | 38 | * far_offset (stored in bit 16 of layout ) |
1da177e4 LT |
39 | * |
40 | * The data to be stored is divided into chunks using chunksize. | |
41 | * Each device is divided into far_copies sections. | |
42 | * In each section, chunks are laid out in a style similar to raid0, but | |
43 | * near_copies copies of each chunk is stored (each on a different drive). | |
44 | * The starting device for each section is offset near_copies from the starting | |
45 | * device of the previous section. | |
c93983bf | 46 | * Thus they are (near_copies*far_copies) of each chunk, and each is on a different |
1da177e4 LT |
47 | * drive. |
48 | * near_copies and far_copies must be at least one, and their product is at most | |
49 | * raid_disks. | |
c93983bf N |
50 | * |
51 | * If far_offset is true, then the far_copies are handled a bit differently. | |
52 | * The copies are still in different stripes, but instead of be very far apart | |
53 | * on disk, there are adjacent stripes. | |
1da177e4 LT |
54 | */ |
55 | ||
56 | /* | |
57 | * Number of guaranteed r10bios in case of extreme VM load: | |
58 | */ | |
59 | #define NR_RAID10_BIOS 256 | |
60 | ||
34db0cd6 N |
61 | /* When there are this many requests queue to be written by |
62 | * the raid10 thread, we become 'congested' to provide back-pressure | |
63 | * for writeback. | |
64 | */ | |
65 | static int max_queued_requests = 1024; | |
66 | ||
e879a879 N |
67 | static void allow_barrier(struct r10conf *conf); |
68 | static void lower_barrier(struct r10conf *conf); | |
0a27ec96 | 69 | |
dd0fc66f | 70 | static void * r10bio_pool_alloc(gfp_t gfp_flags, void *data) |
1da177e4 | 71 | { |
e879a879 | 72 | struct r10conf *conf = data; |
9f2c9d12 | 73 | int size = offsetof(struct r10bio, devs[conf->copies]); |
1da177e4 LT |
74 | |
75 | /* allocate a r10bio with room for raid_disks entries in the bios array */ | |
7eaceacc | 76 | return kzalloc(size, gfp_flags); |
1da177e4 LT |
77 | } |
78 | ||
79 | static void r10bio_pool_free(void *r10_bio, void *data) | |
80 | { | |
81 | kfree(r10_bio); | |
82 | } | |
83 | ||
0310fa21 | 84 | /* Maximum size of each resync request */ |
1da177e4 | 85 | #define RESYNC_BLOCK_SIZE (64*1024) |
1da177e4 | 86 | #define RESYNC_PAGES ((RESYNC_BLOCK_SIZE + PAGE_SIZE-1) / PAGE_SIZE) |
0310fa21 N |
87 | /* amount of memory to reserve for resync requests */ |
88 | #define RESYNC_WINDOW (1024*1024) | |
89 | /* maximum number of concurrent requests, memory permitting */ | |
90 | #define RESYNC_DEPTH (32*1024*1024/RESYNC_BLOCK_SIZE) | |
1da177e4 LT |
91 | |
92 | /* | |
93 | * When performing a resync, we need to read and compare, so | |
94 | * we need as many pages are there are copies. | |
95 | * When performing a recovery, we need 2 bios, one for read, | |
96 | * one for write (we recover only one drive per r10buf) | |
97 | * | |
98 | */ | |
dd0fc66f | 99 | static void * r10buf_pool_alloc(gfp_t gfp_flags, void *data) |
1da177e4 | 100 | { |
e879a879 | 101 | struct r10conf *conf = data; |
1da177e4 | 102 | struct page *page; |
9f2c9d12 | 103 | struct r10bio *r10_bio; |
1da177e4 LT |
104 | struct bio *bio; |
105 | int i, j; | |
106 | int nalloc; | |
107 | ||
108 | r10_bio = r10bio_pool_alloc(gfp_flags, conf); | |
7eaceacc | 109 | if (!r10_bio) |
1da177e4 | 110 | return NULL; |
1da177e4 LT |
111 | |
112 | if (test_bit(MD_RECOVERY_SYNC, &conf->mddev->recovery)) | |
113 | nalloc = conf->copies; /* resync */ | |
114 | else | |
115 | nalloc = 2; /* recovery */ | |
116 | ||
117 | /* | |
118 | * Allocate bios. | |
119 | */ | |
120 | for (j = nalloc ; j-- ; ) { | |
6746557f | 121 | bio = bio_kmalloc(gfp_flags, RESYNC_PAGES); |
1da177e4 LT |
122 | if (!bio) |
123 | goto out_free_bio; | |
124 | r10_bio->devs[j].bio = bio; | |
125 | } | |
126 | /* | |
127 | * Allocate RESYNC_PAGES data pages and attach them | |
128 | * where needed. | |
129 | */ | |
130 | for (j = 0 ; j < nalloc; j++) { | |
131 | bio = r10_bio->devs[j].bio; | |
132 | for (i = 0; i < RESYNC_PAGES; i++) { | |
c65060ad NK |
133 | if (j == 1 && !test_bit(MD_RECOVERY_SYNC, |
134 | &conf->mddev->recovery)) { | |
135 | /* we can share bv_page's during recovery */ | |
136 | struct bio *rbio = r10_bio->devs[0].bio; | |
137 | page = rbio->bi_io_vec[i].bv_page; | |
138 | get_page(page); | |
139 | } else | |
140 | page = alloc_page(gfp_flags); | |
1da177e4 LT |
141 | if (unlikely(!page)) |
142 | goto out_free_pages; | |
143 | ||
144 | bio->bi_io_vec[i].bv_page = page; | |
145 | } | |
146 | } | |
147 | ||
148 | return r10_bio; | |
149 | ||
150 | out_free_pages: | |
151 | for ( ; i > 0 ; i--) | |
1345b1d8 | 152 | safe_put_page(bio->bi_io_vec[i-1].bv_page); |
1da177e4 LT |
153 | while (j--) |
154 | for (i = 0; i < RESYNC_PAGES ; i++) | |
1345b1d8 | 155 | safe_put_page(r10_bio->devs[j].bio->bi_io_vec[i].bv_page); |
1da177e4 LT |
156 | j = -1; |
157 | out_free_bio: | |
158 | while ( ++j < nalloc ) | |
159 | bio_put(r10_bio->devs[j].bio); | |
160 | r10bio_pool_free(r10_bio, conf); | |
161 | return NULL; | |
162 | } | |
163 | ||
164 | static void r10buf_pool_free(void *__r10_bio, void *data) | |
165 | { | |
166 | int i; | |
e879a879 | 167 | struct r10conf *conf = data; |
9f2c9d12 | 168 | struct r10bio *r10bio = __r10_bio; |
1da177e4 LT |
169 | int j; |
170 | ||
171 | for (j=0; j < conf->copies; j++) { | |
172 | struct bio *bio = r10bio->devs[j].bio; | |
173 | if (bio) { | |
174 | for (i = 0; i < RESYNC_PAGES; i++) { | |
1345b1d8 | 175 | safe_put_page(bio->bi_io_vec[i].bv_page); |
1da177e4 LT |
176 | bio->bi_io_vec[i].bv_page = NULL; |
177 | } | |
178 | bio_put(bio); | |
179 | } | |
180 | } | |
181 | r10bio_pool_free(r10bio, conf); | |
182 | } | |
183 | ||
e879a879 | 184 | static void put_all_bios(struct r10conf *conf, struct r10bio *r10_bio) |
1da177e4 LT |
185 | { |
186 | int i; | |
187 | ||
188 | for (i = 0; i < conf->copies; i++) { | |
189 | struct bio **bio = & r10_bio->devs[i].bio; | |
749c55e9 | 190 | if (!BIO_SPECIAL(*bio)) |
1da177e4 LT |
191 | bio_put(*bio); |
192 | *bio = NULL; | |
193 | } | |
194 | } | |
195 | ||
9f2c9d12 | 196 | static void free_r10bio(struct r10bio *r10_bio) |
1da177e4 | 197 | { |
e879a879 | 198 | struct r10conf *conf = r10_bio->mddev->private; |
1da177e4 | 199 | |
1da177e4 LT |
200 | put_all_bios(conf, r10_bio); |
201 | mempool_free(r10_bio, conf->r10bio_pool); | |
202 | } | |
203 | ||
9f2c9d12 | 204 | static void put_buf(struct r10bio *r10_bio) |
1da177e4 | 205 | { |
e879a879 | 206 | struct r10conf *conf = r10_bio->mddev->private; |
1da177e4 LT |
207 | |
208 | mempool_free(r10_bio, conf->r10buf_pool); | |
209 | ||
0a27ec96 | 210 | lower_barrier(conf); |
1da177e4 LT |
211 | } |
212 | ||
9f2c9d12 | 213 | static void reschedule_retry(struct r10bio *r10_bio) |
1da177e4 LT |
214 | { |
215 | unsigned long flags; | |
fd01b88c | 216 | struct mddev *mddev = r10_bio->mddev; |
e879a879 | 217 | struct r10conf *conf = mddev->private; |
1da177e4 LT |
218 | |
219 | spin_lock_irqsave(&conf->device_lock, flags); | |
220 | list_add(&r10_bio->retry_list, &conf->retry_list); | |
4443ae10 | 221 | conf->nr_queued ++; |
1da177e4 LT |
222 | spin_unlock_irqrestore(&conf->device_lock, flags); |
223 | ||
388667be AJ |
224 | /* wake up frozen array... */ |
225 | wake_up(&conf->wait_barrier); | |
226 | ||
1da177e4 LT |
227 | md_wakeup_thread(mddev->thread); |
228 | } | |
229 | ||
230 | /* | |
231 | * raid_end_bio_io() is called when we have finished servicing a mirrored | |
232 | * operation and are ready to return a success/failure code to the buffer | |
233 | * cache layer. | |
234 | */ | |
9f2c9d12 | 235 | static void raid_end_bio_io(struct r10bio *r10_bio) |
1da177e4 LT |
236 | { |
237 | struct bio *bio = r10_bio->master_bio; | |
856e08e2 | 238 | int done; |
e879a879 | 239 | struct r10conf *conf = r10_bio->mddev->private; |
1da177e4 | 240 | |
856e08e2 N |
241 | if (bio->bi_phys_segments) { |
242 | unsigned long flags; | |
243 | spin_lock_irqsave(&conf->device_lock, flags); | |
244 | bio->bi_phys_segments--; | |
245 | done = (bio->bi_phys_segments == 0); | |
246 | spin_unlock_irqrestore(&conf->device_lock, flags); | |
247 | } else | |
248 | done = 1; | |
249 | if (!test_bit(R10BIO_Uptodate, &r10_bio->state)) | |
250 | clear_bit(BIO_UPTODATE, &bio->bi_flags); | |
251 | if (done) { | |
252 | bio_endio(bio, 0); | |
253 | /* | |
254 | * Wake up any possible resync thread that waits for the device | |
255 | * to go idle. | |
256 | */ | |
257 | allow_barrier(conf); | |
258 | } | |
1da177e4 LT |
259 | free_r10bio(r10_bio); |
260 | } | |
261 | ||
262 | /* | |
263 | * Update disk head position estimator based on IRQ completion info. | |
264 | */ | |
9f2c9d12 | 265 | static inline void update_head_pos(int slot, struct r10bio *r10_bio) |
1da177e4 | 266 | { |
e879a879 | 267 | struct r10conf *conf = r10_bio->mddev->private; |
1da177e4 LT |
268 | |
269 | conf->mirrors[r10_bio->devs[slot].devnum].head_position = | |
270 | r10_bio->devs[slot].addr + (r10_bio->sectors); | |
271 | } | |
272 | ||
778ca018 NK |
273 | /* |
274 | * Find the disk number which triggered given bio | |
275 | */ | |
e879a879 | 276 | static int find_bio_disk(struct r10conf *conf, struct r10bio *r10_bio, |
749c55e9 | 277 | struct bio *bio, int *slotp) |
778ca018 NK |
278 | { |
279 | int slot; | |
280 | ||
281 | for (slot = 0; slot < conf->copies; slot++) | |
282 | if (r10_bio->devs[slot].bio == bio) | |
283 | break; | |
284 | ||
285 | BUG_ON(slot == conf->copies); | |
286 | update_head_pos(slot, r10_bio); | |
287 | ||
749c55e9 N |
288 | if (slotp) |
289 | *slotp = slot; | |
778ca018 NK |
290 | return r10_bio->devs[slot].devnum; |
291 | } | |
292 | ||
6712ecf8 | 293 | static void raid10_end_read_request(struct bio *bio, int error) |
1da177e4 LT |
294 | { |
295 | int uptodate = test_bit(BIO_UPTODATE, &bio->bi_flags); | |
9f2c9d12 | 296 | struct r10bio *r10_bio = bio->bi_private; |
1da177e4 | 297 | int slot, dev; |
e879a879 | 298 | struct r10conf *conf = r10_bio->mddev->private; |
1da177e4 | 299 | |
1da177e4 LT |
300 | |
301 | slot = r10_bio->read_slot; | |
302 | dev = r10_bio->devs[slot].devnum; | |
303 | /* | |
304 | * this branch is our 'one mirror IO has finished' event handler: | |
305 | */ | |
4443ae10 N |
306 | update_head_pos(slot, r10_bio); |
307 | ||
308 | if (uptodate) { | |
1da177e4 LT |
309 | /* |
310 | * Set R10BIO_Uptodate in our master bio, so that | |
311 | * we will return a good error code to the higher | |
312 | * levels even if IO on some other mirrored buffer fails. | |
313 | * | |
314 | * The 'master' represents the composite IO operation to | |
315 | * user-side. So if something waits for IO, then it will | |
316 | * wait for the 'master' bio. | |
317 | */ | |
318 | set_bit(R10BIO_Uptodate, &r10_bio->state); | |
1da177e4 | 319 | raid_end_bio_io(r10_bio); |
7c4e06ff | 320 | rdev_dec_pending(conf->mirrors[dev].rdev, conf->mddev); |
4443ae10 | 321 | } else { |
1da177e4 | 322 | /* |
7c4e06ff | 323 | * oops, read error - keep the refcount on the rdev |
1da177e4 LT |
324 | */ |
325 | char b[BDEVNAME_SIZE]; | |
8bda470e CD |
326 | printk_ratelimited(KERN_ERR |
327 | "md/raid10:%s: %s: rescheduling sector %llu\n", | |
328 | mdname(conf->mddev), | |
329 | bdevname(conf->mirrors[dev].rdev->bdev, b), | |
330 | (unsigned long long)r10_bio->sector); | |
856e08e2 | 331 | set_bit(R10BIO_ReadError, &r10_bio->state); |
1da177e4 LT |
332 | reschedule_retry(r10_bio); |
333 | } | |
1da177e4 LT |
334 | } |
335 | ||
9f2c9d12 | 336 | static void close_write(struct r10bio *r10_bio) |
bd870a16 N |
337 | { |
338 | /* clear the bitmap if all writes complete successfully */ | |
339 | bitmap_endwrite(r10_bio->mddev->bitmap, r10_bio->sector, | |
340 | r10_bio->sectors, | |
341 | !test_bit(R10BIO_Degraded, &r10_bio->state), | |
342 | 0); | |
343 | md_write_end(r10_bio->mddev); | |
344 | } | |
345 | ||
9f2c9d12 | 346 | static void one_write_done(struct r10bio *r10_bio) |
19d5f834 N |
347 | { |
348 | if (atomic_dec_and_test(&r10_bio->remaining)) { | |
349 | if (test_bit(R10BIO_WriteError, &r10_bio->state)) | |
350 | reschedule_retry(r10_bio); | |
351 | else { | |
352 | close_write(r10_bio); | |
353 | if (test_bit(R10BIO_MadeGood, &r10_bio->state)) | |
354 | reschedule_retry(r10_bio); | |
355 | else | |
356 | raid_end_bio_io(r10_bio); | |
357 | } | |
358 | } | |
359 | } | |
360 | ||
6712ecf8 | 361 | static void raid10_end_write_request(struct bio *bio, int error) |
1da177e4 LT |
362 | { |
363 | int uptodate = test_bit(BIO_UPTODATE, &bio->bi_flags); | |
9f2c9d12 | 364 | struct r10bio *r10_bio = bio->bi_private; |
778ca018 | 365 | int dev; |
749c55e9 | 366 | int dec_rdev = 1; |
e879a879 | 367 | struct r10conf *conf = r10_bio->mddev->private; |
749c55e9 | 368 | int slot; |
1da177e4 | 369 | |
749c55e9 | 370 | dev = find_bio_disk(conf, r10_bio, bio, &slot); |
1da177e4 LT |
371 | |
372 | /* | |
373 | * this branch is our 'one mirror IO has finished' event handler: | |
374 | */ | |
6cce3b23 | 375 | if (!uptodate) { |
bd870a16 N |
376 | set_bit(WriteErrorSeen, &conf->mirrors[dev].rdev->flags); |
377 | set_bit(R10BIO_WriteError, &r10_bio->state); | |
378 | dec_rdev = 0; | |
749c55e9 | 379 | } else { |
1da177e4 LT |
380 | /* |
381 | * Set R10BIO_Uptodate in our master bio, so that | |
382 | * we will return a good error code for to the higher | |
383 | * levels even if IO on some other mirrored buffer fails. | |
384 | * | |
385 | * The 'master' represents the composite IO operation to | |
386 | * user-side. So if something waits for IO, then it will | |
387 | * wait for the 'master' bio. | |
388 | */ | |
749c55e9 N |
389 | sector_t first_bad; |
390 | int bad_sectors; | |
391 | ||
1da177e4 LT |
392 | set_bit(R10BIO_Uptodate, &r10_bio->state); |
393 | ||
749c55e9 N |
394 | /* Maybe we can clear some bad blocks. */ |
395 | if (is_badblock(conf->mirrors[dev].rdev, | |
396 | r10_bio->devs[slot].addr, | |
397 | r10_bio->sectors, | |
398 | &first_bad, &bad_sectors)) { | |
399 | bio_put(bio); | |
400 | r10_bio->devs[slot].bio = IO_MADE_GOOD; | |
401 | dec_rdev = 0; | |
402 | set_bit(R10BIO_MadeGood, &r10_bio->state); | |
403 | } | |
404 | } | |
405 | ||
1da177e4 LT |
406 | /* |
407 | * | |
408 | * Let's see if all mirrored write operations have finished | |
409 | * already. | |
410 | */ | |
19d5f834 | 411 | one_write_done(r10_bio); |
749c55e9 N |
412 | if (dec_rdev) |
413 | rdev_dec_pending(conf->mirrors[dev].rdev, conf->mddev); | |
1da177e4 LT |
414 | } |
415 | ||
416 | ||
417 | /* | |
418 | * RAID10 layout manager | |
25985edc | 419 | * As well as the chunksize and raid_disks count, there are two |
1da177e4 LT |
420 | * parameters: near_copies and far_copies. |
421 | * near_copies * far_copies must be <= raid_disks. | |
422 | * Normally one of these will be 1. | |
423 | * If both are 1, we get raid0. | |
424 | * If near_copies == raid_disks, we get raid1. | |
425 | * | |
25985edc | 426 | * Chunks are laid out in raid0 style with near_copies copies of the |
1da177e4 LT |
427 | * first chunk, followed by near_copies copies of the next chunk and |
428 | * so on. | |
429 | * If far_copies > 1, then after 1/far_copies of the array has been assigned | |
430 | * as described above, we start again with a device offset of near_copies. | |
431 | * So we effectively have another copy of the whole array further down all | |
432 | * the drives, but with blocks on different drives. | |
433 | * With this layout, and block is never stored twice on the one device. | |
434 | * | |
435 | * raid10_find_phys finds the sector offset of a given virtual sector | |
c93983bf | 436 | * on each device that it is on. |
1da177e4 LT |
437 | * |
438 | * raid10_find_virt does the reverse mapping, from a device and a | |
439 | * sector offset to a virtual address | |
440 | */ | |
441 | ||
e879a879 | 442 | static void raid10_find_phys(struct r10conf *conf, struct r10bio *r10bio) |
1da177e4 LT |
443 | { |
444 | int n,f; | |
445 | sector_t sector; | |
446 | sector_t chunk; | |
447 | sector_t stripe; | |
448 | int dev; | |
449 | ||
450 | int slot = 0; | |
451 | ||
452 | /* now calculate first sector/dev */ | |
453 | chunk = r10bio->sector >> conf->chunk_shift; | |
454 | sector = r10bio->sector & conf->chunk_mask; | |
455 | ||
456 | chunk *= conf->near_copies; | |
457 | stripe = chunk; | |
458 | dev = sector_div(stripe, conf->raid_disks); | |
c93983bf N |
459 | if (conf->far_offset) |
460 | stripe *= conf->far_copies; | |
1da177e4 LT |
461 | |
462 | sector += stripe << conf->chunk_shift; | |
463 | ||
464 | /* and calculate all the others */ | |
465 | for (n=0; n < conf->near_copies; n++) { | |
466 | int d = dev; | |
467 | sector_t s = sector; | |
468 | r10bio->devs[slot].addr = sector; | |
469 | r10bio->devs[slot].devnum = d; | |
470 | slot++; | |
471 | ||
472 | for (f = 1; f < conf->far_copies; f++) { | |
473 | d += conf->near_copies; | |
474 | if (d >= conf->raid_disks) | |
475 | d -= conf->raid_disks; | |
476 | s += conf->stride; | |
477 | r10bio->devs[slot].devnum = d; | |
478 | r10bio->devs[slot].addr = s; | |
479 | slot++; | |
480 | } | |
481 | dev++; | |
482 | if (dev >= conf->raid_disks) { | |
483 | dev = 0; | |
484 | sector += (conf->chunk_mask + 1); | |
485 | } | |
486 | } | |
487 | BUG_ON(slot != conf->copies); | |
488 | } | |
489 | ||
e879a879 | 490 | static sector_t raid10_find_virt(struct r10conf *conf, sector_t sector, int dev) |
1da177e4 LT |
491 | { |
492 | sector_t offset, chunk, vchunk; | |
493 | ||
1da177e4 | 494 | offset = sector & conf->chunk_mask; |
c93983bf N |
495 | if (conf->far_offset) { |
496 | int fc; | |
497 | chunk = sector >> conf->chunk_shift; | |
498 | fc = sector_div(chunk, conf->far_copies); | |
499 | dev -= fc * conf->near_copies; | |
500 | if (dev < 0) | |
501 | dev += conf->raid_disks; | |
502 | } else { | |
64a742bc | 503 | while (sector >= conf->stride) { |
c93983bf N |
504 | sector -= conf->stride; |
505 | if (dev < conf->near_copies) | |
506 | dev += conf->raid_disks - conf->near_copies; | |
507 | else | |
508 | dev -= conf->near_copies; | |
509 | } | |
510 | chunk = sector >> conf->chunk_shift; | |
511 | } | |
1da177e4 LT |
512 | vchunk = chunk * conf->raid_disks + dev; |
513 | sector_div(vchunk, conf->near_copies); | |
514 | return (vchunk << conf->chunk_shift) + offset; | |
515 | } | |
516 | ||
517 | /** | |
518 | * raid10_mergeable_bvec -- tell bio layer if a two requests can be merged | |
519 | * @q: request queue | |
cc371e66 | 520 | * @bvm: properties of new bio |
1da177e4 LT |
521 | * @biovec: the request that could be merged to it. |
522 | * | |
523 | * Return amount of bytes we can accept at this offset | |
524 | * If near_copies == raid_disk, there are no striping issues, | |
525 | * but in that case, the function isn't called at all. | |
526 | */ | |
cc371e66 AK |
527 | static int raid10_mergeable_bvec(struct request_queue *q, |
528 | struct bvec_merge_data *bvm, | |
529 | struct bio_vec *biovec) | |
1da177e4 | 530 | { |
fd01b88c | 531 | struct mddev *mddev = q->queuedata; |
cc371e66 | 532 | sector_t sector = bvm->bi_sector + get_start_sect(bvm->bi_bdev); |
1da177e4 | 533 | int max; |
9d8f0363 | 534 | unsigned int chunk_sectors = mddev->chunk_sectors; |
cc371e66 | 535 | unsigned int bio_sectors = bvm->bi_size >> 9; |
1da177e4 LT |
536 | |
537 | max = (chunk_sectors - ((sector & (chunk_sectors - 1)) + bio_sectors)) << 9; | |
538 | if (max < 0) max = 0; /* bio_add cannot handle a negative return */ | |
cc371e66 AK |
539 | if (max <= biovec->bv_len && bio_sectors == 0) |
540 | return biovec->bv_len; | |
1da177e4 LT |
541 | else |
542 | return max; | |
543 | } | |
544 | ||
545 | /* | |
546 | * This routine returns the disk from which the requested read should | |
547 | * be done. There is a per-array 'next expected sequential IO' sector | |
548 | * number - if this matches on the next IO then we use the last disk. | |
549 | * There is also a per-disk 'last know head position' sector that is | |
550 | * maintained from IRQ contexts, both the normal and the resync IO | |
551 | * completion handlers update this position correctly. If there is no | |
552 | * perfect sequential match then we pick the disk whose head is closest. | |
553 | * | |
554 | * If there are 2 mirrors in the same 2 devices, performance degrades | |
555 | * because position is mirror, not device based. | |
556 | * | |
557 | * The rdev for the device selected will have nr_pending incremented. | |
558 | */ | |
559 | ||
560 | /* | |
561 | * FIXME: possibly should rethink readbalancing and do it differently | |
562 | * depending on near_copies / far_copies geometry. | |
563 | */ | |
e879a879 | 564 | static int read_balance(struct r10conf *conf, struct r10bio *r10_bio, int *max_sectors) |
1da177e4 | 565 | { |
af3a2cd6 | 566 | const sector_t this_sector = r10_bio->sector; |
56d99121 | 567 | int disk, slot; |
856e08e2 N |
568 | int sectors = r10_bio->sectors; |
569 | int best_good_sectors; | |
56d99121 | 570 | sector_t new_distance, best_dist; |
3cb03002 | 571 | struct md_rdev *rdev; |
56d99121 N |
572 | int do_balance; |
573 | int best_slot; | |
1da177e4 LT |
574 | |
575 | raid10_find_phys(conf, r10_bio); | |
576 | rcu_read_lock(); | |
56d99121 | 577 | retry: |
856e08e2 | 578 | sectors = r10_bio->sectors; |
56d99121 N |
579 | best_slot = -1; |
580 | best_dist = MaxSector; | |
856e08e2 | 581 | best_good_sectors = 0; |
56d99121 | 582 | do_balance = 1; |
1da177e4 LT |
583 | /* |
584 | * Check if we can balance. We can balance on the whole | |
6cce3b23 N |
585 | * device if no resync is going on (recovery is ok), or below |
586 | * the resync window. We take the first readable disk when | |
587 | * above the resync window. | |
1da177e4 LT |
588 | */ |
589 | if (conf->mddev->recovery_cp < MaxSector | |
56d99121 N |
590 | && (this_sector + sectors >= conf->next_resync)) |
591 | do_balance = 0; | |
1da177e4 | 592 | |
56d99121 | 593 | for (slot = 0; slot < conf->copies ; slot++) { |
856e08e2 N |
594 | sector_t first_bad; |
595 | int bad_sectors; | |
596 | sector_t dev_sector; | |
597 | ||
56d99121 N |
598 | if (r10_bio->devs[slot].bio == IO_BLOCKED) |
599 | continue; | |
1da177e4 | 600 | disk = r10_bio->devs[slot].devnum; |
56d99121 N |
601 | rdev = rcu_dereference(conf->mirrors[disk].rdev); |
602 | if (rdev == NULL) | |
1da177e4 | 603 | continue; |
56d99121 N |
604 | if (!test_bit(In_sync, &rdev->flags)) |
605 | continue; | |
606 | ||
856e08e2 N |
607 | dev_sector = r10_bio->devs[slot].addr; |
608 | if (is_badblock(rdev, dev_sector, sectors, | |
609 | &first_bad, &bad_sectors)) { | |
610 | if (best_dist < MaxSector) | |
611 | /* Already have a better slot */ | |
612 | continue; | |
613 | if (first_bad <= dev_sector) { | |
614 | /* Cannot read here. If this is the | |
615 | * 'primary' device, then we must not read | |
616 | * beyond 'bad_sectors' from another device. | |
617 | */ | |
618 | bad_sectors -= (dev_sector - first_bad); | |
619 | if (!do_balance && sectors > bad_sectors) | |
620 | sectors = bad_sectors; | |
621 | if (best_good_sectors > sectors) | |
622 | best_good_sectors = sectors; | |
623 | } else { | |
624 | sector_t good_sectors = | |
625 | first_bad - dev_sector; | |
626 | if (good_sectors > best_good_sectors) { | |
627 | best_good_sectors = good_sectors; | |
628 | best_slot = slot; | |
629 | } | |
630 | if (!do_balance) | |
631 | /* Must read from here */ | |
632 | break; | |
633 | } | |
634 | continue; | |
635 | } else | |
636 | best_good_sectors = sectors; | |
637 | ||
56d99121 N |
638 | if (!do_balance) |
639 | break; | |
1da177e4 | 640 | |
22dfdf52 N |
641 | /* This optimisation is debatable, and completely destroys |
642 | * sequential read speed for 'far copies' arrays. So only | |
643 | * keep it for 'near' arrays, and review those later. | |
644 | */ | |
56d99121 | 645 | if (conf->near_copies > 1 && !atomic_read(&rdev->nr_pending)) |
1da177e4 | 646 | break; |
8ed3a195 KS |
647 | |
648 | /* for far > 1 always use the lowest address */ | |
649 | if (conf->far_copies > 1) | |
56d99121 | 650 | new_distance = r10_bio->devs[slot].addr; |
8ed3a195 | 651 | else |
56d99121 N |
652 | new_distance = abs(r10_bio->devs[slot].addr - |
653 | conf->mirrors[disk].head_position); | |
654 | if (new_distance < best_dist) { | |
655 | best_dist = new_distance; | |
656 | best_slot = slot; | |
1da177e4 LT |
657 | } |
658 | } | |
56d99121 N |
659 | if (slot == conf->copies) |
660 | slot = best_slot; | |
1da177e4 | 661 | |
56d99121 N |
662 | if (slot >= 0) { |
663 | disk = r10_bio->devs[slot].devnum; | |
664 | rdev = rcu_dereference(conf->mirrors[disk].rdev); | |
665 | if (!rdev) | |
666 | goto retry; | |
667 | atomic_inc(&rdev->nr_pending); | |
668 | if (test_bit(Faulty, &rdev->flags)) { | |
669 | /* Cannot risk returning a device that failed | |
670 | * before we inc'ed nr_pending | |
671 | */ | |
672 | rdev_dec_pending(rdev, conf->mddev); | |
673 | goto retry; | |
674 | } | |
675 | r10_bio->read_slot = slot; | |
676 | } else | |
29fc7e3e | 677 | disk = -1; |
1da177e4 | 678 | rcu_read_unlock(); |
856e08e2 | 679 | *max_sectors = best_good_sectors; |
1da177e4 LT |
680 | |
681 | return disk; | |
682 | } | |
683 | ||
0d129228 N |
684 | static int raid10_congested(void *data, int bits) |
685 | { | |
fd01b88c | 686 | struct mddev *mddev = data; |
e879a879 | 687 | struct r10conf *conf = mddev->private; |
0d129228 N |
688 | int i, ret = 0; |
689 | ||
34db0cd6 N |
690 | if ((bits & (1 << BDI_async_congested)) && |
691 | conf->pending_count >= max_queued_requests) | |
692 | return 1; | |
693 | ||
3fa841d7 N |
694 | if (mddev_congested(mddev, bits)) |
695 | return 1; | |
0d129228 | 696 | rcu_read_lock(); |
84707f38 | 697 | for (i = 0; i < conf->raid_disks && ret == 0; i++) { |
3cb03002 | 698 | struct md_rdev *rdev = rcu_dereference(conf->mirrors[i].rdev); |
0d129228 | 699 | if (rdev && !test_bit(Faulty, &rdev->flags)) { |
165125e1 | 700 | struct request_queue *q = bdev_get_queue(rdev->bdev); |
0d129228 N |
701 | |
702 | ret |= bdi_congested(&q->backing_dev_info, bits); | |
703 | } | |
704 | } | |
705 | rcu_read_unlock(); | |
706 | return ret; | |
707 | } | |
708 | ||
e879a879 | 709 | static void flush_pending_writes(struct r10conf *conf) |
a35e63ef N |
710 | { |
711 | /* Any writes that have been queued but are awaiting | |
712 | * bitmap updates get flushed here. | |
a35e63ef | 713 | */ |
a35e63ef N |
714 | spin_lock_irq(&conf->device_lock); |
715 | ||
716 | if (conf->pending_bio_list.head) { | |
717 | struct bio *bio; | |
718 | bio = bio_list_get(&conf->pending_bio_list); | |
34db0cd6 | 719 | conf->pending_count = 0; |
a35e63ef N |
720 | spin_unlock_irq(&conf->device_lock); |
721 | /* flush any pending bitmap writes to disk | |
722 | * before proceeding w/ I/O */ | |
723 | bitmap_unplug(conf->mddev->bitmap); | |
34db0cd6 | 724 | wake_up(&conf->wait_barrier); |
a35e63ef N |
725 | |
726 | while (bio) { /* submit pending writes */ | |
727 | struct bio *next = bio->bi_next; | |
728 | bio->bi_next = NULL; | |
729 | generic_make_request(bio); | |
730 | bio = next; | |
731 | } | |
a35e63ef N |
732 | } else |
733 | spin_unlock_irq(&conf->device_lock); | |
a35e63ef | 734 | } |
7eaceacc | 735 | |
0a27ec96 N |
736 | /* Barriers.... |
737 | * Sometimes we need to suspend IO while we do something else, | |
738 | * either some resync/recovery, or reconfigure the array. | |
739 | * To do this we raise a 'barrier'. | |
740 | * The 'barrier' is a counter that can be raised multiple times | |
741 | * to count how many activities are happening which preclude | |
742 | * normal IO. | |
743 | * We can only raise the barrier if there is no pending IO. | |
744 | * i.e. if nr_pending == 0. | |
745 | * We choose only to raise the barrier if no-one is waiting for the | |
746 | * barrier to go down. This means that as soon as an IO request | |
747 | * is ready, no other operations which require a barrier will start | |
748 | * until the IO request has had a chance. | |
749 | * | |
750 | * So: regular IO calls 'wait_barrier'. When that returns there | |
751 | * is no backgroup IO happening, It must arrange to call | |
752 | * allow_barrier when it has finished its IO. | |
753 | * backgroup IO calls must call raise_barrier. Once that returns | |
754 | * there is no normal IO happeing. It must arrange to call | |
755 | * lower_barrier when the particular background IO completes. | |
1da177e4 | 756 | */ |
1da177e4 | 757 | |
e879a879 | 758 | static void raise_barrier(struct r10conf *conf, int force) |
1da177e4 | 759 | { |
6cce3b23 | 760 | BUG_ON(force && !conf->barrier); |
1da177e4 | 761 | spin_lock_irq(&conf->resync_lock); |
0a27ec96 | 762 | |
6cce3b23 N |
763 | /* Wait until no block IO is waiting (unless 'force') */ |
764 | wait_event_lock_irq(conf->wait_barrier, force || !conf->nr_waiting, | |
c3b328ac | 765 | conf->resync_lock, ); |
0a27ec96 N |
766 | |
767 | /* block any new IO from starting */ | |
768 | conf->barrier++; | |
769 | ||
c3b328ac | 770 | /* Now wait for all pending IO to complete */ |
0a27ec96 N |
771 | wait_event_lock_irq(conf->wait_barrier, |
772 | !conf->nr_pending && conf->barrier < RESYNC_DEPTH, | |
c3b328ac | 773 | conf->resync_lock, ); |
0a27ec96 N |
774 | |
775 | spin_unlock_irq(&conf->resync_lock); | |
776 | } | |
777 | ||
e879a879 | 778 | static void lower_barrier(struct r10conf *conf) |
0a27ec96 N |
779 | { |
780 | unsigned long flags; | |
781 | spin_lock_irqsave(&conf->resync_lock, flags); | |
782 | conf->barrier--; | |
783 | spin_unlock_irqrestore(&conf->resync_lock, flags); | |
784 | wake_up(&conf->wait_barrier); | |
785 | } | |
786 | ||
e879a879 | 787 | static void wait_barrier(struct r10conf *conf) |
0a27ec96 N |
788 | { |
789 | spin_lock_irq(&conf->resync_lock); | |
790 | if (conf->barrier) { | |
791 | conf->nr_waiting++; | |
792 | wait_event_lock_irq(conf->wait_barrier, !conf->barrier, | |
793 | conf->resync_lock, | |
c3b328ac | 794 | ); |
0a27ec96 | 795 | conf->nr_waiting--; |
1da177e4 | 796 | } |
0a27ec96 | 797 | conf->nr_pending++; |
1da177e4 LT |
798 | spin_unlock_irq(&conf->resync_lock); |
799 | } | |
800 | ||
e879a879 | 801 | static void allow_barrier(struct r10conf *conf) |
0a27ec96 N |
802 | { |
803 | unsigned long flags; | |
804 | spin_lock_irqsave(&conf->resync_lock, flags); | |
805 | conf->nr_pending--; | |
806 | spin_unlock_irqrestore(&conf->resync_lock, flags); | |
807 | wake_up(&conf->wait_barrier); | |
808 | } | |
809 | ||
e879a879 | 810 | static void freeze_array(struct r10conf *conf) |
4443ae10 N |
811 | { |
812 | /* stop syncio and normal IO and wait for everything to | |
f188593e | 813 | * go quiet. |
4443ae10 | 814 | * We increment barrier and nr_waiting, and then |
1c830532 N |
815 | * wait until nr_pending match nr_queued+1 |
816 | * This is called in the context of one normal IO request | |
817 | * that has failed. Thus any sync request that might be pending | |
818 | * will be blocked by nr_pending, and we need to wait for | |
819 | * pending IO requests to complete or be queued for re-try. | |
820 | * Thus the number queued (nr_queued) plus this request (1) | |
821 | * must match the number of pending IOs (nr_pending) before | |
822 | * we continue. | |
4443ae10 N |
823 | */ |
824 | spin_lock_irq(&conf->resync_lock); | |
825 | conf->barrier++; | |
826 | conf->nr_waiting++; | |
827 | wait_event_lock_irq(conf->wait_barrier, | |
1c830532 | 828 | conf->nr_pending == conf->nr_queued+1, |
4443ae10 | 829 | conf->resync_lock, |
c3b328ac N |
830 | flush_pending_writes(conf)); |
831 | ||
4443ae10 N |
832 | spin_unlock_irq(&conf->resync_lock); |
833 | } | |
834 | ||
e879a879 | 835 | static void unfreeze_array(struct r10conf *conf) |
4443ae10 N |
836 | { |
837 | /* reverse the effect of the freeze */ | |
838 | spin_lock_irq(&conf->resync_lock); | |
839 | conf->barrier--; | |
840 | conf->nr_waiting--; | |
841 | wake_up(&conf->wait_barrier); | |
842 | spin_unlock_irq(&conf->resync_lock); | |
843 | } | |
844 | ||
fd01b88c | 845 | static int make_request(struct mddev *mddev, struct bio * bio) |
1da177e4 | 846 | { |
e879a879 | 847 | struct r10conf *conf = mddev->private; |
0f6d02d5 | 848 | struct mirror_info *mirror; |
9f2c9d12 | 849 | struct r10bio *r10_bio; |
1da177e4 LT |
850 | struct bio *read_bio; |
851 | int i; | |
852 | int chunk_sects = conf->chunk_mask + 1; | |
a362357b | 853 | const int rw = bio_data_dir(bio); |
2c7d46ec | 854 | const unsigned long do_sync = (bio->bi_rw & REQ_SYNC); |
e9c7469b | 855 | const unsigned long do_fua = (bio->bi_rw & REQ_FUA); |
6cce3b23 | 856 | unsigned long flags; |
3cb03002 | 857 | struct md_rdev *blocked_rdev; |
c3b328ac | 858 | int plugged; |
d4432c23 N |
859 | int sectors_handled; |
860 | int max_sectors; | |
1da177e4 | 861 | |
e9c7469b TH |
862 | if (unlikely(bio->bi_rw & REQ_FLUSH)) { |
863 | md_flush_request(mddev, bio); | |
e5dcdd80 N |
864 | return 0; |
865 | } | |
866 | ||
1da177e4 LT |
867 | /* If this request crosses a chunk boundary, we need to |
868 | * split it. This will only happen for 1 PAGE (or less) requests. | |
869 | */ | |
870 | if (unlikely( (bio->bi_sector & conf->chunk_mask) + (bio->bi_size >> 9) | |
871 | > chunk_sects && | |
872 | conf->near_copies < conf->raid_disks)) { | |
873 | struct bio_pair *bp; | |
874 | /* Sanity check -- queue functions should prevent this happening */ | |
875 | if (bio->bi_vcnt != 1 || | |
876 | bio->bi_idx != 0) | |
877 | goto bad_map; | |
878 | /* This is a one page bio that upper layers | |
879 | * refuse to split for us, so we need to split it. | |
880 | */ | |
6feef531 | 881 | bp = bio_split(bio, |
1da177e4 | 882 | chunk_sects - (bio->bi_sector & (chunk_sects - 1)) ); |
51e9ac77 N |
883 | |
884 | /* Each of these 'make_request' calls will call 'wait_barrier'. | |
885 | * If the first succeeds but the second blocks due to the resync | |
886 | * thread raising the barrier, we will deadlock because the | |
887 | * IO to the underlying device will be queued in generic_make_request | |
888 | * and will never complete, so will never reduce nr_pending. | |
889 | * So increment nr_waiting here so no new raise_barriers will | |
890 | * succeed, and so the second wait_barrier cannot block. | |
891 | */ | |
892 | spin_lock_irq(&conf->resync_lock); | |
893 | conf->nr_waiting++; | |
894 | spin_unlock_irq(&conf->resync_lock); | |
895 | ||
21a52c6d | 896 | if (make_request(mddev, &bp->bio1)) |
1da177e4 | 897 | generic_make_request(&bp->bio1); |
21a52c6d | 898 | if (make_request(mddev, &bp->bio2)) |
1da177e4 LT |
899 | generic_make_request(&bp->bio2); |
900 | ||
51e9ac77 N |
901 | spin_lock_irq(&conf->resync_lock); |
902 | conf->nr_waiting--; | |
903 | wake_up(&conf->wait_barrier); | |
904 | spin_unlock_irq(&conf->resync_lock); | |
905 | ||
1da177e4 LT |
906 | bio_pair_release(bp); |
907 | return 0; | |
908 | bad_map: | |
128595ed N |
909 | printk("md/raid10:%s: make_request bug: can't convert block across chunks" |
910 | " or bigger than %dk %llu %d\n", mdname(mddev), chunk_sects/2, | |
1da177e4 LT |
911 | (unsigned long long)bio->bi_sector, bio->bi_size >> 10); |
912 | ||
6712ecf8 | 913 | bio_io_error(bio); |
1da177e4 LT |
914 | return 0; |
915 | } | |
916 | ||
3d310eb7 | 917 | md_write_start(mddev, bio); |
06d91a5f | 918 | |
1da177e4 LT |
919 | /* |
920 | * Register the new request and wait if the reconstruction | |
921 | * thread has put up a bar for new requests. | |
922 | * Continue immediately if no resync is active currently. | |
923 | */ | |
0a27ec96 | 924 | wait_barrier(conf); |
1da177e4 | 925 | |
1da177e4 LT |
926 | r10_bio = mempool_alloc(conf->r10bio_pool, GFP_NOIO); |
927 | ||
928 | r10_bio->master_bio = bio; | |
929 | r10_bio->sectors = bio->bi_size >> 9; | |
930 | ||
931 | r10_bio->mddev = mddev; | |
932 | r10_bio->sector = bio->bi_sector; | |
6cce3b23 | 933 | r10_bio->state = 0; |
1da177e4 | 934 | |
856e08e2 N |
935 | /* We might need to issue multiple reads to different |
936 | * devices if there are bad blocks around, so we keep | |
937 | * track of the number of reads in bio->bi_phys_segments. | |
938 | * If this is 0, there is only one r10_bio and no locking | |
939 | * will be needed when the request completes. If it is | |
940 | * non-zero, then it is the number of not-completed requests. | |
941 | */ | |
942 | bio->bi_phys_segments = 0; | |
943 | clear_bit(BIO_SEG_VALID, &bio->bi_flags); | |
944 | ||
a362357b | 945 | if (rw == READ) { |
1da177e4 LT |
946 | /* |
947 | * read balancing logic: | |
948 | */ | |
856e08e2 N |
949 | int disk; |
950 | int slot; | |
951 | ||
952 | read_again: | |
953 | disk = read_balance(conf, r10_bio, &max_sectors); | |
954 | slot = r10_bio->read_slot; | |
1da177e4 LT |
955 | if (disk < 0) { |
956 | raid_end_bio_io(r10_bio); | |
957 | return 0; | |
958 | } | |
959 | mirror = conf->mirrors + disk; | |
960 | ||
a167f663 | 961 | read_bio = bio_clone_mddev(bio, GFP_NOIO, mddev); |
856e08e2 N |
962 | md_trim_bio(read_bio, r10_bio->sector - bio->bi_sector, |
963 | max_sectors); | |
1da177e4 LT |
964 | |
965 | r10_bio->devs[slot].bio = read_bio; | |
966 | ||
967 | read_bio->bi_sector = r10_bio->devs[slot].addr + | |
968 | mirror->rdev->data_offset; | |
969 | read_bio->bi_bdev = mirror->rdev->bdev; | |
970 | read_bio->bi_end_io = raid10_end_read_request; | |
7b6d91da | 971 | read_bio->bi_rw = READ | do_sync; |
1da177e4 LT |
972 | read_bio->bi_private = r10_bio; |
973 | ||
856e08e2 N |
974 | if (max_sectors < r10_bio->sectors) { |
975 | /* Could not read all from this device, so we will | |
976 | * need another r10_bio. | |
977 | */ | |
856e08e2 N |
978 | sectors_handled = (r10_bio->sectors + max_sectors |
979 | - bio->bi_sector); | |
980 | r10_bio->sectors = max_sectors; | |
981 | spin_lock_irq(&conf->device_lock); | |
982 | if (bio->bi_phys_segments == 0) | |
983 | bio->bi_phys_segments = 2; | |
984 | else | |
985 | bio->bi_phys_segments++; | |
986 | spin_unlock(&conf->device_lock); | |
987 | /* Cannot call generic_make_request directly | |
988 | * as that will be queued in __generic_make_request | |
989 | * and subsequent mempool_alloc might block | |
990 | * waiting for it. so hand bio over to raid10d. | |
991 | */ | |
992 | reschedule_retry(r10_bio); | |
993 | ||
994 | r10_bio = mempool_alloc(conf->r10bio_pool, GFP_NOIO); | |
995 | ||
996 | r10_bio->master_bio = bio; | |
997 | r10_bio->sectors = ((bio->bi_size >> 9) | |
998 | - sectors_handled); | |
999 | r10_bio->state = 0; | |
1000 | r10_bio->mddev = mddev; | |
1001 | r10_bio->sector = bio->bi_sector + sectors_handled; | |
1002 | goto read_again; | |
1003 | } else | |
1004 | generic_make_request(read_bio); | |
1da177e4 LT |
1005 | return 0; |
1006 | } | |
1007 | ||
1008 | /* | |
1009 | * WRITE: | |
1010 | */ | |
34db0cd6 N |
1011 | if (conf->pending_count >= max_queued_requests) { |
1012 | md_wakeup_thread(mddev->thread); | |
1013 | wait_event(conf->wait_barrier, | |
1014 | conf->pending_count < max_queued_requests); | |
1015 | } | |
6bfe0b49 | 1016 | /* first select target devices under rcu_lock and |
1da177e4 LT |
1017 | * inc refcount on their rdev. Record them by setting |
1018 | * bios[x] to bio | |
d4432c23 N |
1019 | * If there are known/acknowledged bad blocks on any device |
1020 | * on which we have seen a write error, we want to avoid | |
1021 | * writing to those blocks. This potentially requires several | |
1022 | * writes to write around the bad blocks. Each set of writes | |
1023 | * gets its own r10_bio with a set of bios attached. The number | |
1024 | * of r10_bios is recored in bio->bi_phys_segments just as with | |
1025 | * the read case. | |
1da177e4 | 1026 | */ |
c3b328ac N |
1027 | plugged = mddev_check_plugged(mddev); |
1028 | ||
1da177e4 | 1029 | raid10_find_phys(conf, r10_bio); |
d4432c23 | 1030 | retry_write: |
cb6969e8 | 1031 | blocked_rdev = NULL; |
1da177e4 | 1032 | rcu_read_lock(); |
d4432c23 N |
1033 | max_sectors = r10_bio->sectors; |
1034 | ||
1da177e4 LT |
1035 | for (i = 0; i < conf->copies; i++) { |
1036 | int d = r10_bio->devs[i].devnum; | |
3cb03002 | 1037 | struct md_rdev *rdev = rcu_dereference(conf->mirrors[d].rdev); |
6bfe0b49 DW |
1038 | if (rdev && unlikely(test_bit(Blocked, &rdev->flags))) { |
1039 | atomic_inc(&rdev->nr_pending); | |
1040 | blocked_rdev = rdev; | |
1041 | break; | |
1042 | } | |
d4432c23 N |
1043 | r10_bio->devs[i].bio = NULL; |
1044 | if (!rdev || test_bit(Faulty, &rdev->flags)) { | |
6cce3b23 | 1045 | set_bit(R10BIO_Degraded, &r10_bio->state); |
d4432c23 N |
1046 | continue; |
1047 | } | |
1048 | if (test_bit(WriteErrorSeen, &rdev->flags)) { | |
1049 | sector_t first_bad; | |
1050 | sector_t dev_sector = r10_bio->devs[i].addr; | |
1051 | int bad_sectors; | |
1052 | int is_bad; | |
1053 | ||
1054 | is_bad = is_badblock(rdev, dev_sector, | |
1055 | max_sectors, | |
1056 | &first_bad, &bad_sectors); | |
1057 | if (is_bad < 0) { | |
1058 | /* Mustn't write here until the bad block | |
1059 | * is acknowledged | |
1060 | */ | |
1061 | atomic_inc(&rdev->nr_pending); | |
1062 | set_bit(BlockedBadBlocks, &rdev->flags); | |
1063 | blocked_rdev = rdev; | |
1064 | break; | |
1065 | } | |
1066 | if (is_bad && first_bad <= dev_sector) { | |
1067 | /* Cannot write here at all */ | |
1068 | bad_sectors -= (dev_sector - first_bad); | |
1069 | if (bad_sectors < max_sectors) | |
1070 | /* Mustn't write more than bad_sectors | |
1071 | * to other devices yet | |
1072 | */ | |
1073 | max_sectors = bad_sectors; | |
1074 | /* We don't set R10BIO_Degraded as that | |
1075 | * only applies if the disk is missing, | |
1076 | * so it might be re-added, and we want to | |
1077 | * know to recover this chunk. | |
1078 | * In this case the device is here, and the | |
1079 | * fact that this chunk is not in-sync is | |
1080 | * recorded in the bad block log. | |
1081 | */ | |
1082 | continue; | |
1083 | } | |
1084 | if (is_bad) { | |
1085 | int good_sectors = first_bad - dev_sector; | |
1086 | if (good_sectors < max_sectors) | |
1087 | max_sectors = good_sectors; | |
1088 | } | |
6cce3b23 | 1089 | } |
d4432c23 N |
1090 | r10_bio->devs[i].bio = bio; |
1091 | atomic_inc(&rdev->nr_pending); | |
1da177e4 LT |
1092 | } |
1093 | rcu_read_unlock(); | |
1094 | ||
6bfe0b49 DW |
1095 | if (unlikely(blocked_rdev)) { |
1096 | /* Have to wait for this device to get unblocked, then retry */ | |
1097 | int j; | |
1098 | int d; | |
1099 | ||
1100 | for (j = 0; j < i; j++) | |
1101 | if (r10_bio->devs[j].bio) { | |
1102 | d = r10_bio->devs[j].devnum; | |
1103 | rdev_dec_pending(conf->mirrors[d].rdev, mddev); | |
1104 | } | |
1105 | allow_barrier(conf); | |
1106 | md_wait_for_blocked_rdev(blocked_rdev, mddev); | |
1107 | wait_barrier(conf); | |
1108 | goto retry_write; | |
1109 | } | |
1110 | ||
d4432c23 N |
1111 | if (max_sectors < r10_bio->sectors) { |
1112 | /* We are splitting this into multiple parts, so | |
1113 | * we need to prepare for allocating another r10_bio. | |
1114 | */ | |
1115 | r10_bio->sectors = max_sectors; | |
1116 | spin_lock_irq(&conf->device_lock); | |
1117 | if (bio->bi_phys_segments == 0) | |
1118 | bio->bi_phys_segments = 2; | |
1119 | else | |
1120 | bio->bi_phys_segments++; | |
1121 | spin_unlock_irq(&conf->device_lock); | |
1122 | } | |
1123 | sectors_handled = r10_bio->sector + max_sectors - bio->bi_sector; | |
1124 | ||
4e78064f | 1125 | atomic_set(&r10_bio->remaining, 1); |
d4432c23 | 1126 | bitmap_startwrite(mddev->bitmap, r10_bio->sector, r10_bio->sectors, 0); |
06d91a5f | 1127 | |
1da177e4 LT |
1128 | for (i = 0; i < conf->copies; i++) { |
1129 | struct bio *mbio; | |
1130 | int d = r10_bio->devs[i].devnum; | |
1131 | if (!r10_bio->devs[i].bio) | |
1132 | continue; | |
1133 | ||
a167f663 | 1134 | mbio = bio_clone_mddev(bio, GFP_NOIO, mddev); |
d4432c23 N |
1135 | md_trim_bio(mbio, r10_bio->sector - bio->bi_sector, |
1136 | max_sectors); | |
1da177e4 LT |
1137 | r10_bio->devs[i].bio = mbio; |
1138 | ||
d4432c23 N |
1139 | mbio->bi_sector = (r10_bio->devs[i].addr+ |
1140 | conf->mirrors[d].rdev->data_offset); | |
1da177e4 LT |
1141 | mbio->bi_bdev = conf->mirrors[d].rdev->bdev; |
1142 | mbio->bi_end_io = raid10_end_write_request; | |
e9c7469b | 1143 | mbio->bi_rw = WRITE | do_sync | do_fua; |
1da177e4 LT |
1144 | mbio->bi_private = r10_bio; |
1145 | ||
1146 | atomic_inc(&r10_bio->remaining); | |
4e78064f N |
1147 | spin_lock_irqsave(&conf->device_lock, flags); |
1148 | bio_list_add(&conf->pending_bio_list, mbio); | |
34db0cd6 | 1149 | conf->pending_count++; |
4e78064f | 1150 | spin_unlock_irqrestore(&conf->device_lock, flags); |
1da177e4 LT |
1151 | } |
1152 | ||
079fa166 N |
1153 | /* Don't remove the bias on 'remaining' (one_write_done) until |
1154 | * after checking if we need to go around again. | |
1155 | */ | |
a35e63ef | 1156 | |
d4432c23 | 1157 | if (sectors_handled < (bio->bi_size >> 9)) { |
079fa166 | 1158 | one_write_done(r10_bio); |
5e570289 | 1159 | /* We need another r10_bio. It has already been counted |
d4432c23 N |
1160 | * in bio->bi_phys_segments. |
1161 | */ | |
1162 | r10_bio = mempool_alloc(conf->r10bio_pool, GFP_NOIO); | |
1163 | ||
1164 | r10_bio->master_bio = bio; | |
1165 | r10_bio->sectors = (bio->bi_size >> 9) - sectors_handled; | |
1166 | ||
1167 | r10_bio->mddev = mddev; | |
1168 | r10_bio->sector = bio->bi_sector + sectors_handled; | |
1169 | r10_bio->state = 0; | |
1170 | goto retry_write; | |
1171 | } | |
079fa166 N |
1172 | one_write_done(r10_bio); |
1173 | ||
1174 | /* In case raid10d snuck in to freeze_array */ | |
1175 | wake_up(&conf->wait_barrier); | |
d4432c23 | 1176 | |
c3b328ac | 1177 | if (do_sync || !mddev->bitmap || !plugged) |
e3881a68 | 1178 | md_wakeup_thread(mddev->thread); |
1da177e4 LT |
1179 | return 0; |
1180 | } | |
1181 | ||
fd01b88c | 1182 | static void status(struct seq_file *seq, struct mddev *mddev) |
1da177e4 | 1183 | { |
e879a879 | 1184 | struct r10conf *conf = mddev->private; |
1da177e4 LT |
1185 | int i; |
1186 | ||
1187 | if (conf->near_copies < conf->raid_disks) | |
9d8f0363 | 1188 | seq_printf(seq, " %dK chunks", mddev->chunk_sectors / 2); |
1da177e4 LT |
1189 | if (conf->near_copies > 1) |
1190 | seq_printf(seq, " %d near-copies", conf->near_copies); | |
c93983bf N |
1191 | if (conf->far_copies > 1) { |
1192 | if (conf->far_offset) | |
1193 | seq_printf(seq, " %d offset-copies", conf->far_copies); | |
1194 | else | |
1195 | seq_printf(seq, " %d far-copies", conf->far_copies); | |
1196 | } | |
1da177e4 | 1197 | seq_printf(seq, " [%d/%d] [", conf->raid_disks, |
76186dd8 | 1198 | conf->raid_disks - mddev->degraded); |
1da177e4 LT |
1199 | for (i = 0; i < conf->raid_disks; i++) |
1200 | seq_printf(seq, "%s", | |
1201 | conf->mirrors[i].rdev && | |
b2d444d7 | 1202 | test_bit(In_sync, &conf->mirrors[i].rdev->flags) ? "U" : "_"); |
1da177e4 LT |
1203 | seq_printf(seq, "]"); |
1204 | } | |
1205 | ||
700c7213 N |
1206 | /* check if there are enough drives for |
1207 | * every block to appear on atleast one. | |
1208 | * Don't consider the device numbered 'ignore' | |
1209 | * as we might be about to remove it. | |
1210 | */ | |
e879a879 | 1211 | static int enough(struct r10conf *conf, int ignore) |
700c7213 N |
1212 | { |
1213 | int first = 0; | |
1214 | ||
1215 | do { | |
1216 | int n = conf->copies; | |
1217 | int cnt = 0; | |
1218 | while (n--) { | |
1219 | if (conf->mirrors[first].rdev && | |
1220 | first != ignore) | |
1221 | cnt++; | |
1222 | first = (first+1) % conf->raid_disks; | |
1223 | } | |
1224 | if (cnt == 0) | |
1225 | return 0; | |
1226 | } while (first != 0); | |
1227 | return 1; | |
1228 | } | |
1229 | ||
fd01b88c | 1230 | static void error(struct mddev *mddev, struct md_rdev *rdev) |
1da177e4 LT |
1231 | { |
1232 | char b[BDEVNAME_SIZE]; | |
e879a879 | 1233 | struct r10conf *conf = mddev->private; |
1da177e4 LT |
1234 | |
1235 | /* | |
1236 | * If it is not operational, then we have already marked it as dead | |
1237 | * else if it is the last working disks, ignore the error, let the | |
1238 | * next level up know. | |
1239 | * else mark the drive as failed | |
1240 | */ | |
b2d444d7 | 1241 | if (test_bit(In_sync, &rdev->flags) |
700c7213 | 1242 | && !enough(conf, rdev->raid_disk)) |
1da177e4 LT |
1243 | /* |
1244 | * Don't fail the drive, just return an IO error. | |
1da177e4 LT |
1245 | */ |
1246 | return; | |
c04be0aa N |
1247 | if (test_and_clear_bit(In_sync, &rdev->flags)) { |
1248 | unsigned long flags; | |
1249 | spin_lock_irqsave(&conf->device_lock, flags); | |
1da177e4 | 1250 | mddev->degraded++; |
c04be0aa | 1251 | spin_unlock_irqrestore(&conf->device_lock, flags); |
1da177e4 LT |
1252 | /* |
1253 | * if recovery is running, make sure it aborts. | |
1254 | */ | |
dfc70645 | 1255 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); |
1da177e4 | 1256 | } |
de393cde | 1257 | set_bit(Blocked, &rdev->flags); |
b2d444d7 | 1258 | set_bit(Faulty, &rdev->flags); |
850b2b42 | 1259 | set_bit(MD_CHANGE_DEVS, &mddev->flags); |
067032bc JP |
1260 | printk(KERN_ALERT |
1261 | "md/raid10:%s: Disk failure on %s, disabling device.\n" | |
1262 | "md/raid10:%s: Operation continuing on %d devices.\n", | |
128595ed N |
1263 | mdname(mddev), bdevname(rdev->bdev, b), |
1264 | mdname(mddev), conf->raid_disks - mddev->degraded); | |
1da177e4 LT |
1265 | } |
1266 | ||
e879a879 | 1267 | static void print_conf(struct r10conf *conf) |
1da177e4 LT |
1268 | { |
1269 | int i; | |
0f6d02d5 | 1270 | struct mirror_info *tmp; |
1da177e4 | 1271 | |
128595ed | 1272 | printk(KERN_DEBUG "RAID10 conf printout:\n"); |
1da177e4 | 1273 | if (!conf) { |
128595ed | 1274 | printk(KERN_DEBUG "(!conf)\n"); |
1da177e4 LT |
1275 | return; |
1276 | } | |
128595ed | 1277 | printk(KERN_DEBUG " --- wd:%d rd:%d\n", conf->raid_disks - conf->mddev->degraded, |
1da177e4 LT |
1278 | conf->raid_disks); |
1279 | ||
1280 | for (i = 0; i < conf->raid_disks; i++) { | |
1281 | char b[BDEVNAME_SIZE]; | |
1282 | tmp = conf->mirrors + i; | |
1283 | if (tmp->rdev) | |
128595ed | 1284 | printk(KERN_DEBUG " disk %d, wo:%d, o:%d, dev:%s\n", |
b2d444d7 N |
1285 | i, !test_bit(In_sync, &tmp->rdev->flags), |
1286 | !test_bit(Faulty, &tmp->rdev->flags), | |
1da177e4 LT |
1287 | bdevname(tmp->rdev->bdev,b)); |
1288 | } | |
1289 | } | |
1290 | ||
e879a879 | 1291 | static void close_sync(struct r10conf *conf) |
1da177e4 | 1292 | { |
0a27ec96 N |
1293 | wait_barrier(conf); |
1294 | allow_barrier(conf); | |
1da177e4 LT |
1295 | |
1296 | mempool_destroy(conf->r10buf_pool); | |
1297 | conf->r10buf_pool = NULL; | |
1298 | } | |
1299 | ||
fd01b88c | 1300 | static int raid10_spare_active(struct mddev *mddev) |
1da177e4 LT |
1301 | { |
1302 | int i; | |
e879a879 | 1303 | struct r10conf *conf = mddev->private; |
0f6d02d5 | 1304 | struct mirror_info *tmp; |
6b965620 N |
1305 | int count = 0; |
1306 | unsigned long flags; | |
1da177e4 LT |
1307 | |
1308 | /* | |
1309 | * Find all non-in_sync disks within the RAID10 configuration | |
1310 | * and mark them in_sync | |
1311 | */ | |
1312 | for (i = 0; i < conf->raid_disks; i++) { | |
1313 | tmp = conf->mirrors + i; | |
1314 | if (tmp->rdev | |
b2d444d7 | 1315 | && !test_bit(Faulty, &tmp->rdev->flags) |
c04be0aa | 1316 | && !test_and_set_bit(In_sync, &tmp->rdev->flags)) { |
6b965620 | 1317 | count++; |
e6ffbcb6 | 1318 | sysfs_notify_dirent(tmp->rdev->sysfs_state); |
1da177e4 LT |
1319 | } |
1320 | } | |
6b965620 N |
1321 | spin_lock_irqsave(&conf->device_lock, flags); |
1322 | mddev->degraded -= count; | |
1323 | spin_unlock_irqrestore(&conf->device_lock, flags); | |
1da177e4 LT |
1324 | |
1325 | print_conf(conf); | |
6b965620 | 1326 | return count; |
1da177e4 LT |
1327 | } |
1328 | ||
1329 | ||
fd01b88c | 1330 | static int raid10_add_disk(struct mddev *mddev, struct md_rdev *rdev) |
1da177e4 | 1331 | { |
e879a879 | 1332 | struct r10conf *conf = mddev->private; |
199050ea | 1333 | int err = -EEXIST; |
1da177e4 | 1334 | int mirror; |
6c2fce2e | 1335 | int first = 0; |
84707f38 | 1336 | int last = conf->raid_disks - 1; |
1da177e4 LT |
1337 | |
1338 | if (mddev->recovery_cp < MaxSector) | |
1339 | /* only hot-add to in-sync arrays, as recovery is | |
1340 | * very different from resync | |
1341 | */ | |
199050ea | 1342 | return -EBUSY; |
700c7213 | 1343 | if (!enough(conf, -1)) |
199050ea | 1344 | return -EINVAL; |
1da177e4 | 1345 | |
a53a6c85 | 1346 | if (rdev->raid_disk >= 0) |
6c2fce2e | 1347 | first = last = rdev->raid_disk; |
1da177e4 | 1348 | |
2c4193df | 1349 | if (rdev->saved_raid_disk >= first && |
6cce3b23 N |
1350 | conf->mirrors[rdev->saved_raid_disk].rdev == NULL) |
1351 | mirror = rdev->saved_raid_disk; | |
1352 | else | |
6c2fce2e | 1353 | mirror = first; |
2bb77736 | 1354 | for ( ; mirror <= last ; mirror++) { |
0f6d02d5 | 1355 | struct mirror_info *p = &conf->mirrors[mirror]; |
2bb77736 N |
1356 | if (p->recovery_disabled == mddev->recovery_disabled) |
1357 | continue; | |
7fcc7c8a | 1358 | if (p->rdev) |
2bb77736 | 1359 | continue; |
1da177e4 | 1360 | |
2bb77736 N |
1361 | disk_stack_limits(mddev->gendisk, rdev->bdev, |
1362 | rdev->data_offset << 9); | |
1363 | /* as we don't honour merge_bvec_fn, we must | |
1364 | * never risk violating it, so limit | |
1365 | * ->max_segments to one lying with a single | |
1366 | * page, as a one page request is never in | |
1367 | * violation. | |
1368 | */ | |
1369 | if (rdev->bdev->bd_disk->queue->merge_bvec_fn) { | |
1370 | blk_queue_max_segments(mddev->queue, 1); | |
1371 | blk_queue_segment_boundary(mddev->queue, | |
1372 | PAGE_CACHE_SIZE - 1); | |
1da177e4 LT |
1373 | } |
1374 | ||
2bb77736 | 1375 | p->head_position = 0; |
d890fa2b | 1376 | p->recovery_disabled = mddev->recovery_disabled - 1; |
2bb77736 N |
1377 | rdev->raid_disk = mirror; |
1378 | err = 0; | |
1379 | if (rdev->saved_raid_disk != mirror) | |
1380 | conf->fullsync = 1; | |
1381 | rcu_assign_pointer(p->rdev, rdev); | |
1382 | break; | |
1383 | } | |
1384 | ||
ac5e7113 | 1385 | md_integrity_add_rdev(rdev, mddev); |
1da177e4 | 1386 | print_conf(conf); |
199050ea | 1387 | return err; |
1da177e4 LT |
1388 | } |
1389 | ||
fd01b88c | 1390 | static int raid10_remove_disk(struct mddev *mddev, int number) |
1da177e4 | 1391 | { |
e879a879 | 1392 | struct r10conf *conf = mddev->private; |
1da177e4 | 1393 | int err = 0; |
3cb03002 | 1394 | struct md_rdev *rdev; |
0f6d02d5 | 1395 | struct mirror_info *p = conf->mirrors+ number; |
1da177e4 LT |
1396 | |
1397 | print_conf(conf); | |
1398 | rdev = p->rdev; | |
1399 | if (rdev) { | |
b2d444d7 | 1400 | if (test_bit(In_sync, &rdev->flags) || |
1da177e4 LT |
1401 | atomic_read(&rdev->nr_pending)) { |
1402 | err = -EBUSY; | |
1403 | goto abort; | |
1404 | } | |
dfc70645 N |
1405 | /* Only remove faulty devices in recovery |
1406 | * is not possible. | |
1407 | */ | |
1408 | if (!test_bit(Faulty, &rdev->flags) && | |
2bb77736 | 1409 | mddev->recovery_disabled != p->recovery_disabled && |
700c7213 | 1410 | enough(conf, -1)) { |
dfc70645 N |
1411 | err = -EBUSY; |
1412 | goto abort; | |
1413 | } | |
1da177e4 | 1414 | p->rdev = NULL; |
fbd568a3 | 1415 | synchronize_rcu(); |
1da177e4 LT |
1416 | if (atomic_read(&rdev->nr_pending)) { |
1417 | /* lost the race, try later */ | |
1418 | err = -EBUSY; | |
1419 | p->rdev = rdev; | |
ac5e7113 | 1420 | goto abort; |
1da177e4 | 1421 | } |
a91a2785 | 1422 | err = md_integrity_register(mddev); |
1da177e4 LT |
1423 | } |
1424 | abort: | |
1425 | ||
1426 | print_conf(conf); | |
1427 | return err; | |
1428 | } | |
1429 | ||
1430 | ||
6712ecf8 | 1431 | static void end_sync_read(struct bio *bio, int error) |
1da177e4 | 1432 | { |
9f2c9d12 | 1433 | struct r10bio *r10_bio = bio->bi_private; |
e879a879 | 1434 | struct r10conf *conf = r10_bio->mddev->private; |
778ca018 | 1435 | int d; |
1da177e4 | 1436 | |
749c55e9 | 1437 | d = find_bio_disk(conf, r10_bio, bio, NULL); |
0eb3ff12 N |
1438 | |
1439 | if (test_bit(BIO_UPTODATE, &bio->bi_flags)) | |
1440 | set_bit(R10BIO_Uptodate, &r10_bio->state); | |
e684e41d N |
1441 | else |
1442 | /* The write handler will notice the lack of | |
1443 | * R10BIO_Uptodate and record any errors etc | |
1444 | */ | |
4dbcdc75 N |
1445 | atomic_add(r10_bio->sectors, |
1446 | &conf->mirrors[d].rdev->corrected_errors); | |
1da177e4 LT |
1447 | |
1448 | /* for reconstruct, we always reschedule after a read. | |
1449 | * for resync, only after all reads | |
1450 | */ | |
73d5c38a | 1451 | rdev_dec_pending(conf->mirrors[d].rdev, conf->mddev); |
1da177e4 LT |
1452 | if (test_bit(R10BIO_IsRecover, &r10_bio->state) || |
1453 | atomic_dec_and_test(&r10_bio->remaining)) { | |
1454 | /* we have read all the blocks, | |
1455 | * do the comparison in process context in raid10d | |
1456 | */ | |
1457 | reschedule_retry(r10_bio); | |
1458 | } | |
1da177e4 LT |
1459 | } |
1460 | ||
9f2c9d12 | 1461 | static void end_sync_request(struct r10bio *r10_bio) |
1da177e4 | 1462 | { |
fd01b88c | 1463 | struct mddev *mddev = r10_bio->mddev; |
dfc70645 | 1464 | |
1da177e4 LT |
1465 | while (atomic_dec_and_test(&r10_bio->remaining)) { |
1466 | if (r10_bio->master_bio == NULL) { | |
1467 | /* the primary of several recovery bios */ | |
73d5c38a | 1468 | sector_t s = r10_bio->sectors; |
1a0b7cd8 N |
1469 | if (test_bit(R10BIO_MadeGood, &r10_bio->state) || |
1470 | test_bit(R10BIO_WriteError, &r10_bio->state)) | |
749c55e9 N |
1471 | reschedule_retry(r10_bio); |
1472 | else | |
1473 | put_buf(r10_bio); | |
73d5c38a | 1474 | md_done_sync(mddev, s, 1); |
1da177e4 LT |
1475 | break; |
1476 | } else { | |
9f2c9d12 | 1477 | struct r10bio *r10_bio2 = (struct r10bio *)r10_bio->master_bio; |
1a0b7cd8 N |
1478 | if (test_bit(R10BIO_MadeGood, &r10_bio->state) || |
1479 | test_bit(R10BIO_WriteError, &r10_bio->state)) | |
749c55e9 N |
1480 | reschedule_retry(r10_bio); |
1481 | else | |
1482 | put_buf(r10_bio); | |
1da177e4 LT |
1483 | r10_bio = r10_bio2; |
1484 | } | |
1485 | } | |
1da177e4 LT |
1486 | } |
1487 | ||
5e570289 N |
1488 | static void end_sync_write(struct bio *bio, int error) |
1489 | { | |
1490 | int uptodate = test_bit(BIO_UPTODATE, &bio->bi_flags); | |
9f2c9d12 | 1491 | struct r10bio *r10_bio = bio->bi_private; |
fd01b88c | 1492 | struct mddev *mddev = r10_bio->mddev; |
e879a879 | 1493 | struct r10conf *conf = mddev->private; |
5e570289 N |
1494 | int d; |
1495 | sector_t first_bad; | |
1496 | int bad_sectors; | |
1497 | int slot; | |
1498 | ||
1499 | d = find_bio_disk(conf, r10_bio, bio, &slot); | |
1500 | ||
1501 | if (!uptodate) { | |
1502 | set_bit(WriteErrorSeen, &conf->mirrors[d].rdev->flags); | |
1503 | set_bit(R10BIO_WriteError, &r10_bio->state); | |
1504 | } else if (is_badblock(conf->mirrors[d].rdev, | |
1505 | r10_bio->devs[slot].addr, | |
1506 | r10_bio->sectors, | |
1507 | &first_bad, &bad_sectors)) | |
1508 | set_bit(R10BIO_MadeGood, &r10_bio->state); | |
1509 | ||
1510 | rdev_dec_pending(conf->mirrors[d].rdev, mddev); | |
1511 | ||
1512 | end_sync_request(r10_bio); | |
1513 | } | |
1514 | ||
1da177e4 LT |
1515 | /* |
1516 | * Note: sync and recover and handled very differently for raid10 | |
1517 | * This code is for resync. | |
1518 | * For resync, we read through virtual addresses and read all blocks. | |
1519 | * If there is any error, we schedule a write. The lowest numbered | |
1520 | * drive is authoritative. | |
1521 | * However requests come for physical address, so we need to map. | |
1522 | * For every physical address there are raid_disks/copies virtual addresses, | |
1523 | * which is always are least one, but is not necessarly an integer. | |
1524 | * This means that a physical address can span multiple chunks, so we may | |
1525 | * have to submit multiple io requests for a single sync request. | |
1526 | */ | |
1527 | /* | |
1528 | * We check if all blocks are in-sync and only write to blocks that | |
1529 | * aren't in sync | |
1530 | */ | |
9f2c9d12 | 1531 | static void sync_request_write(struct mddev *mddev, struct r10bio *r10_bio) |
1da177e4 | 1532 | { |
e879a879 | 1533 | struct r10conf *conf = mddev->private; |
1da177e4 LT |
1534 | int i, first; |
1535 | struct bio *tbio, *fbio; | |
1536 | ||
1537 | atomic_set(&r10_bio->remaining, 1); | |
1538 | ||
1539 | /* find the first device with a block */ | |
1540 | for (i=0; i<conf->copies; i++) | |
1541 | if (test_bit(BIO_UPTODATE, &r10_bio->devs[i].bio->bi_flags)) | |
1542 | break; | |
1543 | ||
1544 | if (i == conf->copies) | |
1545 | goto done; | |
1546 | ||
1547 | first = i; | |
1548 | fbio = r10_bio->devs[i].bio; | |
1549 | ||
1550 | /* now find blocks with errors */ | |
0eb3ff12 N |
1551 | for (i=0 ; i < conf->copies ; i++) { |
1552 | int j, d; | |
1553 | int vcnt = r10_bio->sectors >> (PAGE_SHIFT-9); | |
1da177e4 | 1554 | |
1da177e4 | 1555 | tbio = r10_bio->devs[i].bio; |
0eb3ff12 N |
1556 | |
1557 | if (tbio->bi_end_io != end_sync_read) | |
1558 | continue; | |
1559 | if (i == first) | |
1da177e4 | 1560 | continue; |
0eb3ff12 N |
1561 | if (test_bit(BIO_UPTODATE, &r10_bio->devs[i].bio->bi_flags)) { |
1562 | /* We know that the bi_io_vec layout is the same for | |
1563 | * both 'first' and 'i', so we just compare them. | |
1564 | * All vec entries are PAGE_SIZE; | |
1565 | */ | |
1566 | for (j = 0; j < vcnt; j++) | |
1567 | if (memcmp(page_address(fbio->bi_io_vec[j].bv_page), | |
1568 | page_address(tbio->bi_io_vec[j].bv_page), | |
1569 | PAGE_SIZE)) | |
1570 | break; | |
1571 | if (j == vcnt) | |
1572 | continue; | |
1573 | mddev->resync_mismatches += r10_bio->sectors; | |
f84ee364 N |
1574 | if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)) |
1575 | /* Don't fix anything. */ | |
1576 | continue; | |
0eb3ff12 | 1577 | } |
f84ee364 N |
1578 | /* Ok, we need to write this bio, either to correct an |
1579 | * inconsistency or to correct an unreadable block. | |
1da177e4 LT |
1580 | * First we need to fixup bv_offset, bv_len and |
1581 | * bi_vecs, as the read request might have corrupted these | |
1582 | */ | |
1583 | tbio->bi_vcnt = vcnt; | |
1584 | tbio->bi_size = r10_bio->sectors << 9; | |
1585 | tbio->bi_idx = 0; | |
1586 | tbio->bi_phys_segments = 0; | |
1da177e4 LT |
1587 | tbio->bi_flags &= ~(BIO_POOL_MASK - 1); |
1588 | tbio->bi_flags |= 1 << BIO_UPTODATE; | |
1589 | tbio->bi_next = NULL; | |
1590 | tbio->bi_rw = WRITE; | |
1591 | tbio->bi_private = r10_bio; | |
1592 | tbio->bi_sector = r10_bio->devs[i].addr; | |
1593 | ||
1594 | for (j=0; j < vcnt ; j++) { | |
1595 | tbio->bi_io_vec[j].bv_offset = 0; | |
1596 | tbio->bi_io_vec[j].bv_len = PAGE_SIZE; | |
1597 | ||
1598 | memcpy(page_address(tbio->bi_io_vec[j].bv_page), | |
1599 | page_address(fbio->bi_io_vec[j].bv_page), | |
1600 | PAGE_SIZE); | |
1601 | } | |
1602 | tbio->bi_end_io = end_sync_write; | |
1603 | ||
1604 | d = r10_bio->devs[i].devnum; | |
1605 | atomic_inc(&conf->mirrors[d].rdev->nr_pending); | |
1606 | atomic_inc(&r10_bio->remaining); | |
1607 | md_sync_acct(conf->mirrors[d].rdev->bdev, tbio->bi_size >> 9); | |
1608 | ||
1609 | tbio->bi_sector += conf->mirrors[d].rdev->data_offset; | |
1610 | tbio->bi_bdev = conf->mirrors[d].rdev->bdev; | |
1611 | generic_make_request(tbio); | |
1612 | } | |
1613 | ||
1614 | done: | |
1615 | if (atomic_dec_and_test(&r10_bio->remaining)) { | |
1616 | md_done_sync(mddev, r10_bio->sectors, 1); | |
1617 | put_buf(r10_bio); | |
1618 | } | |
1619 | } | |
1620 | ||
1621 | /* | |
1622 | * Now for the recovery code. | |
1623 | * Recovery happens across physical sectors. | |
1624 | * We recover all non-is_sync drives by finding the virtual address of | |
1625 | * each, and then choose a working drive that also has that virt address. | |
1626 | * There is a separate r10_bio for each non-in_sync drive. | |
1627 | * Only the first two slots are in use. The first for reading, | |
1628 | * The second for writing. | |
1629 | * | |
1630 | */ | |
9f2c9d12 | 1631 | static void fix_recovery_read_error(struct r10bio *r10_bio) |
5e570289 N |
1632 | { |
1633 | /* We got a read error during recovery. | |
1634 | * We repeat the read in smaller page-sized sections. | |
1635 | * If a read succeeds, write it to the new device or record | |
1636 | * a bad block if we cannot. | |
1637 | * If a read fails, record a bad block on both old and | |
1638 | * new devices. | |
1639 | */ | |
fd01b88c | 1640 | struct mddev *mddev = r10_bio->mddev; |
e879a879 | 1641 | struct r10conf *conf = mddev->private; |
5e570289 N |
1642 | struct bio *bio = r10_bio->devs[0].bio; |
1643 | sector_t sect = 0; | |
1644 | int sectors = r10_bio->sectors; | |
1645 | int idx = 0; | |
1646 | int dr = r10_bio->devs[0].devnum; | |
1647 | int dw = r10_bio->devs[1].devnum; | |
1648 | ||
1649 | while (sectors) { | |
1650 | int s = sectors; | |
3cb03002 | 1651 | struct md_rdev *rdev; |
5e570289 N |
1652 | sector_t addr; |
1653 | int ok; | |
1654 | ||
1655 | if (s > (PAGE_SIZE>>9)) | |
1656 | s = PAGE_SIZE >> 9; | |
1657 | ||
1658 | rdev = conf->mirrors[dr].rdev; | |
1659 | addr = r10_bio->devs[0].addr + sect, | |
1660 | ok = sync_page_io(rdev, | |
1661 | addr, | |
1662 | s << 9, | |
1663 | bio->bi_io_vec[idx].bv_page, | |
1664 | READ, false); | |
1665 | if (ok) { | |
1666 | rdev = conf->mirrors[dw].rdev; | |
1667 | addr = r10_bio->devs[1].addr + sect; | |
1668 | ok = sync_page_io(rdev, | |
1669 | addr, | |
1670 | s << 9, | |
1671 | bio->bi_io_vec[idx].bv_page, | |
1672 | WRITE, false); | |
1673 | if (!ok) | |
1674 | set_bit(WriteErrorSeen, &rdev->flags); | |
1675 | } | |
1676 | if (!ok) { | |
1677 | /* We don't worry if we cannot set a bad block - | |
1678 | * it really is bad so there is no loss in not | |
1679 | * recording it yet | |
1680 | */ | |
1681 | rdev_set_badblocks(rdev, addr, s, 0); | |
1682 | ||
1683 | if (rdev != conf->mirrors[dw].rdev) { | |
1684 | /* need bad block on destination too */ | |
3cb03002 | 1685 | struct md_rdev *rdev2 = conf->mirrors[dw].rdev; |
5e570289 N |
1686 | addr = r10_bio->devs[1].addr + sect; |
1687 | ok = rdev_set_badblocks(rdev2, addr, s, 0); | |
1688 | if (!ok) { | |
1689 | /* just abort the recovery */ | |
1690 | printk(KERN_NOTICE | |
1691 | "md/raid10:%s: recovery aborted" | |
1692 | " due to read error\n", | |
1693 | mdname(mddev)); | |
1694 | ||
1695 | conf->mirrors[dw].recovery_disabled | |
1696 | = mddev->recovery_disabled; | |
1697 | set_bit(MD_RECOVERY_INTR, | |
1698 | &mddev->recovery); | |
1699 | break; | |
1700 | } | |
1701 | } | |
1702 | } | |
1703 | ||
1704 | sectors -= s; | |
1705 | sect += s; | |
1706 | idx++; | |
1707 | } | |
1708 | } | |
1da177e4 | 1709 | |
9f2c9d12 | 1710 | static void recovery_request_write(struct mddev *mddev, struct r10bio *r10_bio) |
1da177e4 | 1711 | { |
e879a879 | 1712 | struct r10conf *conf = mddev->private; |
c65060ad NK |
1713 | int d; |
1714 | struct bio *wbio; | |
1da177e4 | 1715 | |
5e570289 N |
1716 | if (!test_bit(R10BIO_Uptodate, &r10_bio->state)) { |
1717 | fix_recovery_read_error(r10_bio); | |
1718 | end_sync_request(r10_bio); | |
1719 | return; | |
1720 | } | |
1721 | ||
c65060ad NK |
1722 | /* |
1723 | * share the pages with the first bio | |
1da177e4 LT |
1724 | * and submit the write request |
1725 | */ | |
1da177e4 | 1726 | wbio = r10_bio->devs[1].bio; |
1da177e4 LT |
1727 | d = r10_bio->devs[1].devnum; |
1728 | ||
1729 | atomic_inc(&conf->mirrors[d].rdev->nr_pending); | |
1730 | md_sync_acct(conf->mirrors[d].rdev->bdev, wbio->bi_size >> 9); | |
5e570289 | 1731 | generic_make_request(wbio); |
1da177e4 LT |
1732 | } |
1733 | ||
1734 | ||
1e50915f RB |
1735 | /* |
1736 | * Used by fix_read_error() to decay the per rdev read_errors. | |
1737 | * We halve the read error count for every hour that has elapsed | |
1738 | * since the last recorded read error. | |
1739 | * | |
1740 | */ | |
fd01b88c | 1741 | static void check_decay_read_errors(struct mddev *mddev, struct md_rdev *rdev) |
1e50915f RB |
1742 | { |
1743 | struct timespec cur_time_mon; | |
1744 | unsigned long hours_since_last; | |
1745 | unsigned int read_errors = atomic_read(&rdev->read_errors); | |
1746 | ||
1747 | ktime_get_ts(&cur_time_mon); | |
1748 | ||
1749 | if (rdev->last_read_error.tv_sec == 0 && | |
1750 | rdev->last_read_error.tv_nsec == 0) { | |
1751 | /* first time we've seen a read error */ | |
1752 | rdev->last_read_error = cur_time_mon; | |
1753 | return; | |
1754 | } | |
1755 | ||
1756 | hours_since_last = (cur_time_mon.tv_sec - | |
1757 | rdev->last_read_error.tv_sec) / 3600; | |
1758 | ||
1759 | rdev->last_read_error = cur_time_mon; | |
1760 | ||
1761 | /* | |
1762 | * if hours_since_last is > the number of bits in read_errors | |
1763 | * just set read errors to 0. We do this to avoid | |
1764 | * overflowing the shift of read_errors by hours_since_last. | |
1765 | */ | |
1766 | if (hours_since_last >= 8 * sizeof(read_errors)) | |
1767 | atomic_set(&rdev->read_errors, 0); | |
1768 | else | |
1769 | atomic_set(&rdev->read_errors, read_errors >> hours_since_last); | |
1770 | } | |
1771 | ||
3cb03002 | 1772 | static int r10_sync_page_io(struct md_rdev *rdev, sector_t sector, |
58c54fcc N |
1773 | int sectors, struct page *page, int rw) |
1774 | { | |
1775 | sector_t first_bad; | |
1776 | int bad_sectors; | |
1777 | ||
1778 | if (is_badblock(rdev, sector, sectors, &first_bad, &bad_sectors) | |
1779 | && (rw == READ || test_bit(WriteErrorSeen, &rdev->flags))) | |
1780 | return -1; | |
1781 | if (sync_page_io(rdev, sector, sectors << 9, page, rw, false)) | |
1782 | /* success */ | |
1783 | return 1; | |
1784 | if (rw == WRITE) | |
1785 | set_bit(WriteErrorSeen, &rdev->flags); | |
1786 | /* need to record an error - either for the block or the device */ | |
1787 | if (!rdev_set_badblocks(rdev, sector, sectors, 0)) | |
1788 | md_error(rdev->mddev, rdev); | |
1789 | return 0; | |
1790 | } | |
1791 | ||
1da177e4 LT |
1792 | /* |
1793 | * This is a kernel thread which: | |
1794 | * | |
1795 | * 1. Retries failed read operations on working mirrors. | |
1796 | * 2. Updates the raid superblock when problems encounter. | |
6814d536 | 1797 | * 3. Performs writes following reads for array synchronising. |
1da177e4 LT |
1798 | */ |
1799 | ||
e879a879 | 1800 | static void fix_read_error(struct r10conf *conf, struct mddev *mddev, struct r10bio *r10_bio) |
6814d536 N |
1801 | { |
1802 | int sect = 0; /* Offset from r10_bio->sector */ | |
1803 | int sectors = r10_bio->sectors; | |
3cb03002 | 1804 | struct md_rdev*rdev; |
1e50915f | 1805 | int max_read_errors = atomic_read(&mddev->max_corr_read_errors); |
0544a21d | 1806 | int d = r10_bio->devs[r10_bio->read_slot].devnum; |
1e50915f | 1807 | |
7c4e06ff N |
1808 | /* still own a reference to this rdev, so it cannot |
1809 | * have been cleared recently. | |
1810 | */ | |
1811 | rdev = conf->mirrors[d].rdev; | |
1e50915f | 1812 | |
7c4e06ff N |
1813 | if (test_bit(Faulty, &rdev->flags)) |
1814 | /* drive has already been failed, just ignore any | |
1815 | more fix_read_error() attempts */ | |
1816 | return; | |
1e50915f | 1817 | |
7c4e06ff N |
1818 | check_decay_read_errors(mddev, rdev); |
1819 | atomic_inc(&rdev->read_errors); | |
1820 | if (atomic_read(&rdev->read_errors) > max_read_errors) { | |
1821 | char b[BDEVNAME_SIZE]; | |
1822 | bdevname(rdev->bdev, b); | |
1e50915f | 1823 | |
7c4e06ff N |
1824 | printk(KERN_NOTICE |
1825 | "md/raid10:%s: %s: Raid device exceeded " | |
1826 | "read_error threshold [cur %d:max %d]\n", | |
1827 | mdname(mddev), b, | |
1828 | atomic_read(&rdev->read_errors), max_read_errors); | |
1829 | printk(KERN_NOTICE | |
1830 | "md/raid10:%s: %s: Failing raid device\n", | |
1831 | mdname(mddev), b); | |
1832 | md_error(mddev, conf->mirrors[d].rdev); | |
1833 | return; | |
1e50915f | 1834 | } |
1e50915f | 1835 | |
6814d536 N |
1836 | while(sectors) { |
1837 | int s = sectors; | |
1838 | int sl = r10_bio->read_slot; | |
1839 | int success = 0; | |
1840 | int start; | |
1841 | ||
1842 | if (s > (PAGE_SIZE>>9)) | |
1843 | s = PAGE_SIZE >> 9; | |
1844 | ||
1845 | rcu_read_lock(); | |
1846 | do { | |
8dbed5ce N |
1847 | sector_t first_bad; |
1848 | int bad_sectors; | |
1849 | ||
0544a21d | 1850 | d = r10_bio->devs[sl].devnum; |
6814d536 N |
1851 | rdev = rcu_dereference(conf->mirrors[d].rdev); |
1852 | if (rdev && | |
8dbed5ce N |
1853 | test_bit(In_sync, &rdev->flags) && |
1854 | is_badblock(rdev, r10_bio->devs[sl].addr + sect, s, | |
1855 | &first_bad, &bad_sectors) == 0) { | |
6814d536 N |
1856 | atomic_inc(&rdev->nr_pending); |
1857 | rcu_read_unlock(); | |
2b193363 | 1858 | success = sync_page_io(rdev, |
6814d536 | 1859 | r10_bio->devs[sl].addr + |
ccebd4c4 | 1860 | sect, |
6814d536 | 1861 | s<<9, |
ccebd4c4 | 1862 | conf->tmppage, READ, false); |
6814d536 N |
1863 | rdev_dec_pending(rdev, mddev); |
1864 | rcu_read_lock(); | |
1865 | if (success) | |
1866 | break; | |
1867 | } | |
1868 | sl++; | |
1869 | if (sl == conf->copies) | |
1870 | sl = 0; | |
1871 | } while (!success && sl != r10_bio->read_slot); | |
1872 | rcu_read_unlock(); | |
1873 | ||
1874 | if (!success) { | |
58c54fcc N |
1875 | /* Cannot read from anywhere, just mark the block |
1876 | * as bad on the first device to discourage future | |
1877 | * reads. | |
1878 | */ | |
6814d536 | 1879 | int dn = r10_bio->devs[r10_bio->read_slot].devnum; |
58c54fcc N |
1880 | rdev = conf->mirrors[dn].rdev; |
1881 | ||
1882 | if (!rdev_set_badblocks( | |
1883 | rdev, | |
1884 | r10_bio->devs[r10_bio->read_slot].addr | |
1885 | + sect, | |
1886 | s, 0)) | |
1887 | md_error(mddev, rdev); | |
6814d536 N |
1888 | break; |
1889 | } | |
1890 | ||
1891 | start = sl; | |
1892 | /* write it back and re-read */ | |
1893 | rcu_read_lock(); | |
1894 | while (sl != r10_bio->read_slot) { | |
67b8dc4b | 1895 | char b[BDEVNAME_SIZE]; |
0544a21d | 1896 | |
6814d536 N |
1897 | if (sl==0) |
1898 | sl = conf->copies; | |
1899 | sl--; | |
1900 | d = r10_bio->devs[sl].devnum; | |
1901 | rdev = rcu_dereference(conf->mirrors[d].rdev); | |
1294b9c9 N |
1902 | if (!rdev || |
1903 | !test_bit(In_sync, &rdev->flags)) | |
1904 | continue; | |
1905 | ||
1906 | atomic_inc(&rdev->nr_pending); | |
1907 | rcu_read_unlock(); | |
58c54fcc N |
1908 | if (r10_sync_page_io(rdev, |
1909 | r10_bio->devs[sl].addr + | |
1910 | sect, | |
1911 | s<<9, conf->tmppage, WRITE) | |
1294b9c9 N |
1912 | == 0) { |
1913 | /* Well, this device is dead */ | |
1914 | printk(KERN_NOTICE | |
1915 | "md/raid10:%s: read correction " | |
1916 | "write failed" | |
1917 | " (%d sectors at %llu on %s)\n", | |
1918 | mdname(mddev), s, | |
1919 | (unsigned long long)( | |
1920 | sect + rdev->data_offset), | |
1921 | bdevname(rdev->bdev, b)); | |
1922 | printk(KERN_NOTICE "md/raid10:%s: %s: failing " | |
1923 | "drive\n", | |
1924 | mdname(mddev), | |
1925 | bdevname(rdev->bdev, b)); | |
6814d536 | 1926 | } |
1294b9c9 N |
1927 | rdev_dec_pending(rdev, mddev); |
1928 | rcu_read_lock(); | |
6814d536 N |
1929 | } |
1930 | sl = start; | |
1931 | while (sl != r10_bio->read_slot) { | |
1294b9c9 | 1932 | char b[BDEVNAME_SIZE]; |
0544a21d | 1933 | |
6814d536 N |
1934 | if (sl==0) |
1935 | sl = conf->copies; | |
1936 | sl--; | |
1937 | d = r10_bio->devs[sl].devnum; | |
1938 | rdev = rcu_dereference(conf->mirrors[d].rdev); | |
1294b9c9 N |
1939 | if (!rdev || |
1940 | !test_bit(In_sync, &rdev->flags)) | |
1941 | continue; | |
6814d536 | 1942 | |
1294b9c9 N |
1943 | atomic_inc(&rdev->nr_pending); |
1944 | rcu_read_unlock(); | |
58c54fcc N |
1945 | switch (r10_sync_page_io(rdev, |
1946 | r10_bio->devs[sl].addr + | |
1947 | sect, | |
1948 | s<<9, conf->tmppage, | |
1949 | READ)) { | |
1950 | case 0: | |
1294b9c9 N |
1951 | /* Well, this device is dead */ |
1952 | printk(KERN_NOTICE | |
1953 | "md/raid10:%s: unable to read back " | |
1954 | "corrected sectors" | |
1955 | " (%d sectors at %llu on %s)\n", | |
1956 | mdname(mddev), s, | |
1957 | (unsigned long long)( | |
1958 | sect + rdev->data_offset), | |
1959 | bdevname(rdev->bdev, b)); | |
1960 | printk(KERN_NOTICE "md/raid10:%s: %s: failing " | |
1961 | "drive\n", | |
1962 | mdname(mddev), | |
1963 | bdevname(rdev->bdev, b)); | |
58c54fcc N |
1964 | break; |
1965 | case 1: | |
1294b9c9 N |
1966 | printk(KERN_INFO |
1967 | "md/raid10:%s: read error corrected" | |
1968 | " (%d sectors at %llu on %s)\n", | |
1969 | mdname(mddev), s, | |
1970 | (unsigned long long)( | |
1971 | sect + rdev->data_offset), | |
1972 | bdevname(rdev->bdev, b)); | |
1973 | atomic_add(s, &rdev->corrected_errors); | |
6814d536 | 1974 | } |
1294b9c9 N |
1975 | |
1976 | rdev_dec_pending(rdev, mddev); | |
1977 | rcu_read_lock(); | |
6814d536 N |
1978 | } |
1979 | rcu_read_unlock(); | |
1980 | ||
1981 | sectors -= s; | |
1982 | sect += s; | |
1983 | } | |
1984 | } | |
1985 | ||
bd870a16 N |
1986 | static void bi_complete(struct bio *bio, int error) |
1987 | { | |
1988 | complete((struct completion *)bio->bi_private); | |
1989 | } | |
1990 | ||
1991 | static int submit_bio_wait(int rw, struct bio *bio) | |
1992 | { | |
1993 | struct completion event; | |
1994 | rw |= REQ_SYNC; | |
1995 | ||
1996 | init_completion(&event); | |
1997 | bio->bi_private = &event; | |
1998 | bio->bi_end_io = bi_complete; | |
1999 | submit_bio(rw, bio); | |
2000 | wait_for_completion(&event); | |
2001 | ||
2002 | return test_bit(BIO_UPTODATE, &bio->bi_flags); | |
2003 | } | |
2004 | ||
9f2c9d12 | 2005 | static int narrow_write_error(struct r10bio *r10_bio, int i) |
bd870a16 N |
2006 | { |
2007 | struct bio *bio = r10_bio->master_bio; | |
fd01b88c | 2008 | struct mddev *mddev = r10_bio->mddev; |
e879a879 | 2009 | struct r10conf *conf = mddev->private; |
3cb03002 | 2010 | struct md_rdev *rdev = conf->mirrors[r10_bio->devs[i].devnum].rdev; |
bd870a16 N |
2011 | /* bio has the data to be written to slot 'i' where |
2012 | * we just recently had a write error. | |
2013 | * We repeatedly clone the bio and trim down to one block, | |
2014 | * then try the write. Where the write fails we record | |
2015 | * a bad block. | |
2016 | * It is conceivable that the bio doesn't exactly align with | |
2017 | * blocks. We must handle this. | |
2018 | * | |
2019 | * We currently own a reference to the rdev. | |
2020 | */ | |
2021 | ||
2022 | int block_sectors; | |
2023 | sector_t sector; | |
2024 | int sectors; | |
2025 | int sect_to_write = r10_bio->sectors; | |
2026 | int ok = 1; | |
2027 | ||
2028 | if (rdev->badblocks.shift < 0) | |
2029 | return 0; | |
2030 | ||
2031 | block_sectors = 1 << rdev->badblocks.shift; | |
2032 | sector = r10_bio->sector; | |
2033 | sectors = ((r10_bio->sector + block_sectors) | |
2034 | & ~(sector_t)(block_sectors - 1)) | |
2035 | - sector; | |
2036 | ||
2037 | while (sect_to_write) { | |
2038 | struct bio *wbio; | |
2039 | if (sectors > sect_to_write) | |
2040 | sectors = sect_to_write; | |
2041 | /* Write at 'sector' for 'sectors' */ | |
2042 | wbio = bio_clone_mddev(bio, GFP_NOIO, mddev); | |
2043 | md_trim_bio(wbio, sector - bio->bi_sector, sectors); | |
2044 | wbio->bi_sector = (r10_bio->devs[i].addr+ | |
2045 | rdev->data_offset+ | |
2046 | (sector - r10_bio->sector)); | |
2047 | wbio->bi_bdev = rdev->bdev; | |
2048 | if (submit_bio_wait(WRITE, wbio) == 0) | |
2049 | /* Failure! */ | |
2050 | ok = rdev_set_badblocks(rdev, sector, | |
2051 | sectors, 0) | |
2052 | && ok; | |
2053 | ||
2054 | bio_put(wbio); | |
2055 | sect_to_write -= sectors; | |
2056 | sector += sectors; | |
2057 | sectors = block_sectors; | |
2058 | } | |
2059 | return ok; | |
2060 | } | |
2061 | ||
9f2c9d12 | 2062 | static void handle_read_error(struct mddev *mddev, struct r10bio *r10_bio) |
560f8e55 N |
2063 | { |
2064 | int slot = r10_bio->read_slot; | |
2065 | int mirror = r10_bio->devs[slot].devnum; | |
2066 | struct bio *bio; | |
e879a879 | 2067 | struct r10conf *conf = mddev->private; |
3cb03002 | 2068 | struct md_rdev *rdev; |
560f8e55 N |
2069 | char b[BDEVNAME_SIZE]; |
2070 | unsigned long do_sync; | |
856e08e2 | 2071 | int max_sectors; |
560f8e55 N |
2072 | |
2073 | /* we got a read error. Maybe the drive is bad. Maybe just | |
2074 | * the block and we can fix it. | |
2075 | * We freeze all other IO, and try reading the block from | |
2076 | * other devices. When we find one, we re-write | |
2077 | * and check it that fixes the read error. | |
2078 | * This is all done synchronously while the array is | |
2079 | * frozen. | |
2080 | */ | |
2081 | if (mddev->ro == 0) { | |
2082 | freeze_array(conf); | |
2083 | fix_read_error(conf, mddev, r10_bio); | |
2084 | unfreeze_array(conf); | |
2085 | } | |
2086 | rdev_dec_pending(conf->mirrors[mirror].rdev, mddev); | |
2087 | ||
2088 | bio = r10_bio->devs[slot].bio; | |
7399c31b | 2089 | bdevname(bio->bi_bdev, b); |
560f8e55 N |
2090 | r10_bio->devs[slot].bio = |
2091 | mddev->ro ? IO_BLOCKED : NULL; | |
7399c31b | 2092 | read_more: |
856e08e2 | 2093 | mirror = read_balance(conf, r10_bio, &max_sectors); |
7399c31b | 2094 | if (mirror == -1) { |
560f8e55 N |
2095 | printk(KERN_ALERT "md/raid10:%s: %s: unrecoverable I/O" |
2096 | " read error for block %llu\n", | |
7399c31b | 2097 | mdname(mddev), b, |
560f8e55 N |
2098 | (unsigned long long)r10_bio->sector); |
2099 | raid_end_bio_io(r10_bio); | |
2100 | bio_put(bio); | |
2101 | return; | |
2102 | } | |
2103 | ||
2104 | do_sync = (r10_bio->master_bio->bi_rw & REQ_SYNC); | |
7399c31b N |
2105 | if (bio) |
2106 | bio_put(bio); | |
560f8e55 N |
2107 | slot = r10_bio->read_slot; |
2108 | rdev = conf->mirrors[mirror].rdev; | |
2109 | printk_ratelimited( | |
2110 | KERN_ERR | |
2111 | "md/raid10:%s: %s: redirecting" | |
2112 | "sector %llu to another mirror\n", | |
2113 | mdname(mddev), | |
2114 | bdevname(rdev->bdev, b), | |
2115 | (unsigned long long)r10_bio->sector); | |
2116 | bio = bio_clone_mddev(r10_bio->master_bio, | |
2117 | GFP_NOIO, mddev); | |
7399c31b N |
2118 | md_trim_bio(bio, |
2119 | r10_bio->sector - bio->bi_sector, | |
2120 | max_sectors); | |
560f8e55 N |
2121 | r10_bio->devs[slot].bio = bio; |
2122 | bio->bi_sector = r10_bio->devs[slot].addr | |
2123 | + rdev->data_offset; | |
2124 | bio->bi_bdev = rdev->bdev; | |
2125 | bio->bi_rw = READ | do_sync; | |
2126 | bio->bi_private = r10_bio; | |
2127 | bio->bi_end_io = raid10_end_read_request; | |
7399c31b N |
2128 | if (max_sectors < r10_bio->sectors) { |
2129 | /* Drat - have to split this up more */ | |
2130 | struct bio *mbio = r10_bio->master_bio; | |
2131 | int sectors_handled = | |
2132 | r10_bio->sector + max_sectors | |
2133 | - mbio->bi_sector; | |
2134 | r10_bio->sectors = max_sectors; | |
2135 | spin_lock_irq(&conf->device_lock); | |
2136 | if (mbio->bi_phys_segments == 0) | |
2137 | mbio->bi_phys_segments = 2; | |
2138 | else | |
2139 | mbio->bi_phys_segments++; | |
2140 | spin_unlock_irq(&conf->device_lock); | |
2141 | generic_make_request(bio); | |
2142 | bio = NULL; | |
2143 | ||
2144 | r10_bio = mempool_alloc(conf->r10bio_pool, | |
2145 | GFP_NOIO); | |
2146 | r10_bio->master_bio = mbio; | |
2147 | r10_bio->sectors = (mbio->bi_size >> 9) | |
2148 | - sectors_handled; | |
2149 | r10_bio->state = 0; | |
2150 | set_bit(R10BIO_ReadError, | |
2151 | &r10_bio->state); | |
2152 | r10_bio->mddev = mddev; | |
2153 | r10_bio->sector = mbio->bi_sector | |
2154 | + sectors_handled; | |
2155 | ||
2156 | goto read_more; | |
2157 | } else | |
2158 | generic_make_request(bio); | |
560f8e55 N |
2159 | } |
2160 | ||
e879a879 | 2161 | static void handle_write_completed(struct r10conf *conf, struct r10bio *r10_bio) |
749c55e9 N |
2162 | { |
2163 | /* Some sort of write request has finished and it | |
2164 | * succeeded in writing where we thought there was a | |
2165 | * bad block. So forget the bad block. | |
1a0b7cd8 N |
2166 | * Or possibly if failed and we need to record |
2167 | * a bad block. | |
749c55e9 N |
2168 | */ |
2169 | int m; | |
3cb03002 | 2170 | struct md_rdev *rdev; |
749c55e9 N |
2171 | |
2172 | if (test_bit(R10BIO_IsSync, &r10_bio->state) || | |
2173 | test_bit(R10BIO_IsRecover, &r10_bio->state)) { | |
1a0b7cd8 N |
2174 | for (m = 0; m < conf->copies; m++) { |
2175 | int dev = r10_bio->devs[m].devnum; | |
2176 | rdev = conf->mirrors[dev].rdev; | |
2177 | if (r10_bio->devs[m].bio == NULL) | |
2178 | continue; | |
2179 | if (test_bit(BIO_UPTODATE, | |
749c55e9 | 2180 | &r10_bio->devs[m].bio->bi_flags)) { |
749c55e9 N |
2181 | rdev_clear_badblocks( |
2182 | rdev, | |
2183 | r10_bio->devs[m].addr, | |
2184 | r10_bio->sectors); | |
1a0b7cd8 N |
2185 | } else { |
2186 | if (!rdev_set_badblocks( | |
2187 | rdev, | |
2188 | r10_bio->devs[m].addr, | |
2189 | r10_bio->sectors, 0)) | |
2190 | md_error(conf->mddev, rdev); | |
749c55e9 | 2191 | } |
1a0b7cd8 | 2192 | } |
749c55e9 N |
2193 | put_buf(r10_bio); |
2194 | } else { | |
bd870a16 N |
2195 | for (m = 0; m < conf->copies; m++) { |
2196 | int dev = r10_bio->devs[m].devnum; | |
2197 | struct bio *bio = r10_bio->devs[m].bio; | |
2198 | rdev = conf->mirrors[dev].rdev; | |
2199 | if (bio == IO_MADE_GOOD) { | |
749c55e9 N |
2200 | rdev_clear_badblocks( |
2201 | rdev, | |
2202 | r10_bio->devs[m].addr, | |
2203 | r10_bio->sectors); | |
2204 | rdev_dec_pending(rdev, conf->mddev); | |
bd870a16 N |
2205 | } else if (bio != NULL && |
2206 | !test_bit(BIO_UPTODATE, &bio->bi_flags)) { | |
2207 | if (!narrow_write_error(r10_bio, m)) { | |
2208 | md_error(conf->mddev, rdev); | |
2209 | set_bit(R10BIO_Degraded, | |
2210 | &r10_bio->state); | |
2211 | } | |
2212 | rdev_dec_pending(rdev, conf->mddev); | |
749c55e9 | 2213 | } |
bd870a16 N |
2214 | } |
2215 | if (test_bit(R10BIO_WriteError, | |
2216 | &r10_bio->state)) | |
2217 | close_write(r10_bio); | |
749c55e9 N |
2218 | raid_end_bio_io(r10_bio); |
2219 | } | |
2220 | } | |
2221 | ||
fd01b88c | 2222 | static void raid10d(struct mddev *mddev) |
1da177e4 | 2223 | { |
9f2c9d12 | 2224 | struct r10bio *r10_bio; |
1da177e4 | 2225 | unsigned long flags; |
e879a879 | 2226 | struct r10conf *conf = mddev->private; |
1da177e4 | 2227 | struct list_head *head = &conf->retry_list; |
e1dfa0a2 | 2228 | struct blk_plug plug; |
1da177e4 LT |
2229 | |
2230 | md_check_recovery(mddev); | |
1da177e4 | 2231 | |
e1dfa0a2 | 2232 | blk_start_plug(&plug); |
1da177e4 | 2233 | for (;;) { |
6cce3b23 | 2234 | |
7eaceacc | 2235 | flush_pending_writes(conf); |
6cce3b23 | 2236 | |
a35e63ef N |
2237 | spin_lock_irqsave(&conf->device_lock, flags); |
2238 | if (list_empty(head)) { | |
2239 | spin_unlock_irqrestore(&conf->device_lock, flags); | |
1da177e4 | 2240 | break; |
a35e63ef | 2241 | } |
9f2c9d12 | 2242 | r10_bio = list_entry(head->prev, struct r10bio, retry_list); |
1da177e4 | 2243 | list_del(head->prev); |
4443ae10 | 2244 | conf->nr_queued--; |
1da177e4 LT |
2245 | spin_unlock_irqrestore(&conf->device_lock, flags); |
2246 | ||
2247 | mddev = r10_bio->mddev; | |
070ec55d | 2248 | conf = mddev->private; |
bd870a16 N |
2249 | if (test_bit(R10BIO_MadeGood, &r10_bio->state) || |
2250 | test_bit(R10BIO_WriteError, &r10_bio->state)) | |
749c55e9 N |
2251 | handle_write_completed(conf, r10_bio); |
2252 | else if (test_bit(R10BIO_IsSync, &r10_bio->state)) | |
1da177e4 | 2253 | sync_request_write(mddev, r10_bio); |
7eaceacc | 2254 | else if (test_bit(R10BIO_IsRecover, &r10_bio->state)) |
1da177e4 | 2255 | recovery_request_write(mddev, r10_bio); |
856e08e2 | 2256 | else if (test_bit(R10BIO_ReadError, &r10_bio->state)) |
560f8e55 | 2257 | handle_read_error(mddev, r10_bio); |
856e08e2 N |
2258 | else { |
2259 | /* just a partial read to be scheduled from a | |
2260 | * separate context | |
2261 | */ | |
2262 | int slot = r10_bio->read_slot; | |
2263 | generic_make_request(r10_bio->devs[slot].bio); | |
2264 | } | |
560f8e55 | 2265 | |
1d9d5241 | 2266 | cond_resched(); |
de393cde N |
2267 | if (mddev->flags & ~(1<<MD_CHANGE_PENDING)) |
2268 | md_check_recovery(mddev); | |
1da177e4 | 2269 | } |
e1dfa0a2 | 2270 | blk_finish_plug(&plug); |
1da177e4 LT |
2271 | } |
2272 | ||
2273 | ||
e879a879 | 2274 | static int init_resync(struct r10conf *conf) |
1da177e4 LT |
2275 | { |
2276 | int buffs; | |
2277 | ||
2278 | buffs = RESYNC_WINDOW / RESYNC_BLOCK_SIZE; | |
b6385483 | 2279 | BUG_ON(conf->r10buf_pool); |
1da177e4 LT |
2280 | conf->r10buf_pool = mempool_create(buffs, r10buf_pool_alloc, r10buf_pool_free, conf); |
2281 | if (!conf->r10buf_pool) | |
2282 | return -ENOMEM; | |
2283 | conf->next_resync = 0; | |
2284 | return 0; | |
2285 | } | |
2286 | ||
2287 | /* | |
2288 | * perform a "sync" on one "block" | |
2289 | * | |
2290 | * We need to make sure that no normal I/O request - particularly write | |
2291 | * requests - conflict with active sync requests. | |
2292 | * | |
2293 | * This is achieved by tracking pending requests and a 'barrier' concept | |
2294 | * that can be installed to exclude normal IO requests. | |
2295 | * | |
2296 | * Resync and recovery are handled very differently. | |
2297 | * We differentiate by looking at MD_RECOVERY_SYNC in mddev->recovery. | |
2298 | * | |
2299 | * For resync, we iterate over virtual addresses, read all copies, | |
2300 | * and update if there are differences. If only one copy is live, | |
2301 | * skip it. | |
2302 | * For recovery, we iterate over physical addresses, read a good | |
2303 | * value for each non-in_sync drive, and over-write. | |
2304 | * | |
2305 | * So, for recovery we may have several outstanding complex requests for a | |
2306 | * given address, one for each out-of-sync device. We model this by allocating | |
2307 | * a number of r10_bio structures, one for each out-of-sync device. | |
2308 | * As we setup these structures, we collect all bio's together into a list | |
2309 | * which we then process collectively to add pages, and then process again | |
2310 | * to pass to generic_make_request. | |
2311 | * | |
2312 | * The r10_bio structures are linked using a borrowed master_bio pointer. | |
2313 | * This link is counted in ->remaining. When the r10_bio that points to NULL | |
2314 | * has its remaining count decremented to 0, the whole complex operation | |
2315 | * is complete. | |
2316 | * | |
2317 | */ | |
2318 | ||
fd01b88c | 2319 | static sector_t sync_request(struct mddev *mddev, sector_t sector_nr, |
ab9d47e9 | 2320 | int *skipped, int go_faster) |
1da177e4 | 2321 | { |
e879a879 | 2322 | struct r10conf *conf = mddev->private; |
9f2c9d12 | 2323 | struct r10bio *r10_bio; |
1da177e4 LT |
2324 | struct bio *biolist = NULL, *bio; |
2325 | sector_t max_sector, nr_sectors; | |
1da177e4 | 2326 | int i; |
6cce3b23 | 2327 | int max_sync; |
57dab0bd | 2328 | sector_t sync_blocks; |
1da177e4 LT |
2329 | sector_t sectors_skipped = 0; |
2330 | int chunks_skipped = 0; | |
2331 | ||
2332 | if (!conf->r10buf_pool) | |
2333 | if (init_resync(conf)) | |
57afd89f | 2334 | return 0; |
1da177e4 LT |
2335 | |
2336 | skipped: | |
58c0fed4 | 2337 | max_sector = mddev->dev_sectors; |
1da177e4 LT |
2338 | if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) |
2339 | max_sector = mddev->resync_max_sectors; | |
2340 | if (sector_nr >= max_sector) { | |
6cce3b23 N |
2341 | /* If we aborted, we need to abort the |
2342 | * sync on the 'current' bitmap chucks (there can | |
2343 | * be several when recovering multiple devices). | |
2344 | * as we may have started syncing it but not finished. | |
2345 | * We can find the current address in | |
2346 | * mddev->curr_resync, but for recovery, | |
2347 | * we need to convert that to several | |
2348 | * virtual addresses. | |
2349 | */ | |
2350 | if (mddev->curr_resync < max_sector) { /* aborted */ | |
2351 | if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) | |
2352 | bitmap_end_sync(mddev->bitmap, mddev->curr_resync, | |
2353 | &sync_blocks, 1); | |
2354 | else for (i=0; i<conf->raid_disks; i++) { | |
2355 | sector_t sect = | |
2356 | raid10_find_virt(conf, mddev->curr_resync, i); | |
2357 | bitmap_end_sync(mddev->bitmap, sect, | |
2358 | &sync_blocks, 1); | |
2359 | } | |
2360 | } else /* completed sync */ | |
2361 | conf->fullsync = 0; | |
2362 | ||
2363 | bitmap_close_sync(mddev->bitmap); | |
1da177e4 | 2364 | close_sync(conf); |
57afd89f | 2365 | *skipped = 1; |
1da177e4 LT |
2366 | return sectors_skipped; |
2367 | } | |
2368 | if (chunks_skipped >= conf->raid_disks) { | |
2369 | /* if there has been nothing to do on any drive, | |
2370 | * then there is nothing to do at all.. | |
2371 | */ | |
57afd89f N |
2372 | *skipped = 1; |
2373 | return (max_sector - sector_nr) + sectors_skipped; | |
1da177e4 LT |
2374 | } |
2375 | ||
c6207277 N |
2376 | if (max_sector > mddev->resync_max) |
2377 | max_sector = mddev->resync_max; /* Don't do IO beyond here */ | |
2378 | ||
1da177e4 LT |
2379 | /* make sure whole request will fit in a chunk - if chunks |
2380 | * are meaningful | |
2381 | */ | |
2382 | if (conf->near_copies < conf->raid_disks && | |
2383 | max_sector > (sector_nr | conf->chunk_mask)) | |
2384 | max_sector = (sector_nr | conf->chunk_mask) + 1; | |
2385 | /* | |
2386 | * If there is non-resync activity waiting for us then | |
2387 | * put in a delay to throttle resync. | |
2388 | */ | |
0a27ec96 | 2389 | if (!go_faster && conf->nr_waiting) |
1da177e4 | 2390 | msleep_interruptible(1000); |
1da177e4 LT |
2391 | |
2392 | /* Again, very different code for resync and recovery. | |
2393 | * Both must result in an r10bio with a list of bios that | |
2394 | * have bi_end_io, bi_sector, bi_bdev set, | |
2395 | * and bi_private set to the r10bio. | |
2396 | * For recovery, we may actually create several r10bios | |
2397 | * with 2 bios in each, that correspond to the bios in the main one. | |
2398 | * In this case, the subordinate r10bios link back through a | |
2399 | * borrowed master_bio pointer, and the counter in the master | |
2400 | * includes a ref from each subordinate. | |
2401 | */ | |
2402 | /* First, we decide what to do and set ->bi_end_io | |
2403 | * To end_sync_read if we want to read, and | |
2404 | * end_sync_write if we will want to write. | |
2405 | */ | |
2406 | ||
6cce3b23 | 2407 | max_sync = RESYNC_PAGES << (PAGE_SHIFT-9); |
1da177e4 LT |
2408 | if (!test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) { |
2409 | /* recovery... the complicated one */ | |
e875ecea | 2410 | int j; |
1da177e4 LT |
2411 | r10_bio = NULL; |
2412 | ||
ab9d47e9 N |
2413 | for (i=0 ; i<conf->raid_disks; i++) { |
2414 | int still_degraded; | |
9f2c9d12 | 2415 | struct r10bio *rb2; |
ab9d47e9 N |
2416 | sector_t sect; |
2417 | int must_sync; | |
e875ecea | 2418 | int any_working; |
1da177e4 | 2419 | |
ab9d47e9 N |
2420 | if (conf->mirrors[i].rdev == NULL || |
2421 | test_bit(In_sync, &conf->mirrors[i].rdev->flags)) | |
2422 | continue; | |
1da177e4 | 2423 | |
ab9d47e9 N |
2424 | still_degraded = 0; |
2425 | /* want to reconstruct this device */ | |
2426 | rb2 = r10_bio; | |
2427 | sect = raid10_find_virt(conf, sector_nr, i); | |
2428 | /* Unless we are doing a full sync, we only need | |
2429 | * to recover the block if it is set in the bitmap | |
2430 | */ | |
2431 | must_sync = bitmap_start_sync(mddev->bitmap, sect, | |
2432 | &sync_blocks, 1); | |
2433 | if (sync_blocks < max_sync) | |
2434 | max_sync = sync_blocks; | |
2435 | if (!must_sync && | |
2436 | !conf->fullsync) { | |
2437 | /* yep, skip the sync_blocks here, but don't assume | |
2438 | * that there will never be anything to do here | |
2439 | */ | |
2440 | chunks_skipped = -1; | |
2441 | continue; | |
2442 | } | |
6cce3b23 | 2443 | |
ab9d47e9 N |
2444 | r10_bio = mempool_alloc(conf->r10buf_pool, GFP_NOIO); |
2445 | raise_barrier(conf, rb2 != NULL); | |
2446 | atomic_set(&r10_bio->remaining, 0); | |
18055569 | 2447 | |
ab9d47e9 N |
2448 | r10_bio->master_bio = (struct bio*)rb2; |
2449 | if (rb2) | |
2450 | atomic_inc(&rb2->remaining); | |
2451 | r10_bio->mddev = mddev; | |
2452 | set_bit(R10BIO_IsRecover, &r10_bio->state); | |
2453 | r10_bio->sector = sect; | |
1da177e4 | 2454 | |
ab9d47e9 N |
2455 | raid10_find_phys(conf, r10_bio); |
2456 | ||
2457 | /* Need to check if the array will still be | |
2458 | * degraded | |
2459 | */ | |
2460 | for (j=0; j<conf->raid_disks; j++) | |
2461 | if (conf->mirrors[j].rdev == NULL || | |
2462 | test_bit(Faulty, &conf->mirrors[j].rdev->flags)) { | |
2463 | still_degraded = 1; | |
87fc767b | 2464 | break; |
1da177e4 | 2465 | } |
ab9d47e9 N |
2466 | |
2467 | must_sync = bitmap_start_sync(mddev->bitmap, sect, | |
2468 | &sync_blocks, still_degraded); | |
2469 | ||
e875ecea | 2470 | any_working = 0; |
ab9d47e9 | 2471 | for (j=0; j<conf->copies;j++) { |
e875ecea | 2472 | int k; |
ab9d47e9 | 2473 | int d = r10_bio->devs[j].devnum; |
5e570289 | 2474 | sector_t from_addr, to_addr; |
3cb03002 | 2475 | struct md_rdev *rdev; |
40c356ce N |
2476 | sector_t sector, first_bad; |
2477 | int bad_sectors; | |
ab9d47e9 N |
2478 | if (!conf->mirrors[d].rdev || |
2479 | !test_bit(In_sync, &conf->mirrors[d].rdev->flags)) | |
2480 | continue; | |
2481 | /* This is where we read from */ | |
e875ecea | 2482 | any_working = 1; |
40c356ce N |
2483 | rdev = conf->mirrors[d].rdev; |
2484 | sector = r10_bio->devs[j].addr; | |
2485 | ||
2486 | if (is_badblock(rdev, sector, max_sync, | |
2487 | &first_bad, &bad_sectors)) { | |
2488 | if (first_bad > sector) | |
2489 | max_sync = first_bad - sector; | |
2490 | else { | |
2491 | bad_sectors -= (sector | |
2492 | - first_bad); | |
2493 | if (max_sync > bad_sectors) | |
2494 | max_sync = bad_sectors; | |
2495 | continue; | |
2496 | } | |
2497 | } | |
ab9d47e9 N |
2498 | bio = r10_bio->devs[0].bio; |
2499 | bio->bi_next = biolist; | |
2500 | biolist = bio; | |
2501 | bio->bi_private = r10_bio; | |
2502 | bio->bi_end_io = end_sync_read; | |
2503 | bio->bi_rw = READ; | |
5e570289 N |
2504 | from_addr = r10_bio->devs[j].addr; |
2505 | bio->bi_sector = from_addr + | |
ab9d47e9 N |
2506 | conf->mirrors[d].rdev->data_offset; |
2507 | bio->bi_bdev = conf->mirrors[d].rdev->bdev; | |
2508 | atomic_inc(&conf->mirrors[d].rdev->nr_pending); | |
2509 | atomic_inc(&r10_bio->remaining); | |
2510 | /* and we write to 'i' */ | |
2511 | ||
2512 | for (k=0; k<conf->copies; k++) | |
2513 | if (r10_bio->devs[k].devnum == i) | |
2514 | break; | |
2515 | BUG_ON(k == conf->copies); | |
2516 | bio = r10_bio->devs[1].bio; | |
2517 | bio->bi_next = biolist; | |
2518 | biolist = bio; | |
2519 | bio->bi_private = r10_bio; | |
2520 | bio->bi_end_io = end_sync_write; | |
2521 | bio->bi_rw = WRITE; | |
5e570289 N |
2522 | to_addr = r10_bio->devs[k].addr; |
2523 | bio->bi_sector = to_addr + | |
ab9d47e9 N |
2524 | conf->mirrors[i].rdev->data_offset; |
2525 | bio->bi_bdev = conf->mirrors[i].rdev->bdev; | |
2526 | ||
2527 | r10_bio->devs[0].devnum = d; | |
5e570289 | 2528 | r10_bio->devs[0].addr = from_addr; |
ab9d47e9 | 2529 | r10_bio->devs[1].devnum = i; |
5e570289 | 2530 | r10_bio->devs[1].addr = to_addr; |
ab9d47e9 N |
2531 | |
2532 | break; | |
2533 | } | |
2534 | if (j == conf->copies) { | |
e875ecea N |
2535 | /* Cannot recover, so abort the recovery or |
2536 | * record a bad block */ | |
ab9d47e9 N |
2537 | put_buf(r10_bio); |
2538 | if (rb2) | |
2539 | atomic_dec(&rb2->remaining); | |
2540 | r10_bio = rb2; | |
e875ecea N |
2541 | if (any_working) { |
2542 | /* problem is that there are bad blocks | |
2543 | * on other device(s) | |
2544 | */ | |
2545 | int k; | |
2546 | for (k = 0; k < conf->copies; k++) | |
2547 | if (r10_bio->devs[k].devnum == i) | |
2548 | break; | |
2549 | if (!rdev_set_badblocks( | |
2550 | conf->mirrors[i].rdev, | |
2551 | r10_bio->devs[k].addr, | |
2552 | max_sync, 0)) | |
2553 | any_working = 0; | |
2554 | } | |
2555 | if (!any_working) { | |
2556 | if (!test_and_set_bit(MD_RECOVERY_INTR, | |
2557 | &mddev->recovery)) | |
2558 | printk(KERN_INFO "md/raid10:%s: insufficient " | |
2559 | "working devices for recovery.\n", | |
2560 | mdname(mddev)); | |
2561 | conf->mirrors[i].recovery_disabled | |
2562 | = mddev->recovery_disabled; | |
2563 | } | |
ab9d47e9 | 2564 | break; |
1da177e4 | 2565 | } |
ab9d47e9 | 2566 | } |
1da177e4 LT |
2567 | if (biolist == NULL) { |
2568 | while (r10_bio) { | |
9f2c9d12 N |
2569 | struct r10bio *rb2 = r10_bio; |
2570 | r10_bio = (struct r10bio*) rb2->master_bio; | |
1da177e4 LT |
2571 | rb2->master_bio = NULL; |
2572 | put_buf(rb2); | |
2573 | } | |
2574 | goto giveup; | |
2575 | } | |
2576 | } else { | |
2577 | /* resync. Schedule a read for every block at this virt offset */ | |
2578 | int count = 0; | |
6cce3b23 | 2579 | |
78200d45 N |
2580 | bitmap_cond_end_sync(mddev->bitmap, sector_nr); |
2581 | ||
6cce3b23 N |
2582 | if (!bitmap_start_sync(mddev->bitmap, sector_nr, |
2583 | &sync_blocks, mddev->degraded) && | |
ab9d47e9 N |
2584 | !conf->fullsync && !test_bit(MD_RECOVERY_REQUESTED, |
2585 | &mddev->recovery)) { | |
6cce3b23 N |
2586 | /* We can skip this block */ |
2587 | *skipped = 1; | |
2588 | return sync_blocks + sectors_skipped; | |
2589 | } | |
2590 | if (sync_blocks < max_sync) | |
2591 | max_sync = sync_blocks; | |
1da177e4 LT |
2592 | r10_bio = mempool_alloc(conf->r10buf_pool, GFP_NOIO); |
2593 | ||
1da177e4 LT |
2594 | r10_bio->mddev = mddev; |
2595 | atomic_set(&r10_bio->remaining, 0); | |
6cce3b23 N |
2596 | raise_barrier(conf, 0); |
2597 | conf->next_resync = sector_nr; | |
1da177e4 LT |
2598 | |
2599 | r10_bio->master_bio = NULL; | |
2600 | r10_bio->sector = sector_nr; | |
2601 | set_bit(R10BIO_IsSync, &r10_bio->state); | |
2602 | raid10_find_phys(conf, r10_bio); | |
2603 | r10_bio->sectors = (sector_nr | conf->chunk_mask) - sector_nr +1; | |
2604 | ||
2605 | for (i=0; i<conf->copies; i++) { | |
2606 | int d = r10_bio->devs[i].devnum; | |
40c356ce N |
2607 | sector_t first_bad, sector; |
2608 | int bad_sectors; | |
2609 | ||
1da177e4 LT |
2610 | bio = r10_bio->devs[i].bio; |
2611 | bio->bi_end_io = NULL; | |
af03b8e4 | 2612 | clear_bit(BIO_UPTODATE, &bio->bi_flags); |
1da177e4 | 2613 | if (conf->mirrors[d].rdev == NULL || |
b2d444d7 | 2614 | test_bit(Faulty, &conf->mirrors[d].rdev->flags)) |
1da177e4 | 2615 | continue; |
40c356ce N |
2616 | sector = r10_bio->devs[i].addr; |
2617 | if (is_badblock(conf->mirrors[d].rdev, | |
2618 | sector, max_sync, | |
2619 | &first_bad, &bad_sectors)) { | |
2620 | if (first_bad > sector) | |
2621 | max_sync = first_bad - sector; | |
2622 | else { | |
2623 | bad_sectors -= (sector - first_bad); | |
2624 | if (max_sync > bad_sectors) | |
2625 | max_sync = max_sync; | |
2626 | continue; | |
2627 | } | |
2628 | } | |
1da177e4 LT |
2629 | atomic_inc(&conf->mirrors[d].rdev->nr_pending); |
2630 | atomic_inc(&r10_bio->remaining); | |
2631 | bio->bi_next = biolist; | |
2632 | biolist = bio; | |
2633 | bio->bi_private = r10_bio; | |
2634 | bio->bi_end_io = end_sync_read; | |
802ba064 | 2635 | bio->bi_rw = READ; |
40c356ce | 2636 | bio->bi_sector = sector + |
1da177e4 LT |
2637 | conf->mirrors[d].rdev->data_offset; |
2638 | bio->bi_bdev = conf->mirrors[d].rdev->bdev; | |
2639 | count++; | |
2640 | } | |
2641 | ||
2642 | if (count < 2) { | |
2643 | for (i=0; i<conf->copies; i++) { | |
2644 | int d = r10_bio->devs[i].devnum; | |
2645 | if (r10_bio->devs[i].bio->bi_end_io) | |
ab9d47e9 N |
2646 | rdev_dec_pending(conf->mirrors[d].rdev, |
2647 | mddev); | |
1da177e4 LT |
2648 | } |
2649 | put_buf(r10_bio); | |
2650 | biolist = NULL; | |
2651 | goto giveup; | |
2652 | } | |
2653 | } | |
2654 | ||
2655 | for (bio = biolist; bio ; bio=bio->bi_next) { | |
2656 | ||
2657 | bio->bi_flags &= ~(BIO_POOL_MASK - 1); | |
2658 | if (bio->bi_end_io) | |
2659 | bio->bi_flags |= 1 << BIO_UPTODATE; | |
2660 | bio->bi_vcnt = 0; | |
2661 | bio->bi_idx = 0; | |
2662 | bio->bi_phys_segments = 0; | |
1da177e4 LT |
2663 | bio->bi_size = 0; |
2664 | } | |
2665 | ||
2666 | nr_sectors = 0; | |
6cce3b23 N |
2667 | if (sector_nr + max_sync < max_sector) |
2668 | max_sector = sector_nr + max_sync; | |
1da177e4 LT |
2669 | do { |
2670 | struct page *page; | |
2671 | int len = PAGE_SIZE; | |
1da177e4 LT |
2672 | if (sector_nr + (len>>9) > max_sector) |
2673 | len = (max_sector - sector_nr) << 9; | |
2674 | if (len == 0) | |
2675 | break; | |
2676 | for (bio= biolist ; bio ; bio=bio->bi_next) { | |
ab9d47e9 | 2677 | struct bio *bio2; |
1da177e4 | 2678 | page = bio->bi_io_vec[bio->bi_vcnt].bv_page; |
ab9d47e9 N |
2679 | if (bio_add_page(bio, page, len, 0)) |
2680 | continue; | |
2681 | ||
2682 | /* stop here */ | |
2683 | bio->bi_io_vec[bio->bi_vcnt].bv_page = page; | |
2684 | for (bio2 = biolist; | |
2685 | bio2 && bio2 != bio; | |
2686 | bio2 = bio2->bi_next) { | |
2687 | /* remove last page from this bio */ | |
2688 | bio2->bi_vcnt--; | |
2689 | bio2->bi_size -= len; | |
2690 | bio2->bi_flags &= ~(1<< BIO_SEG_VALID); | |
1da177e4 | 2691 | } |
ab9d47e9 | 2692 | goto bio_full; |
1da177e4 LT |
2693 | } |
2694 | nr_sectors += len>>9; | |
2695 | sector_nr += len>>9; | |
2696 | } while (biolist->bi_vcnt < RESYNC_PAGES); | |
2697 | bio_full: | |
2698 | r10_bio->sectors = nr_sectors; | |
2699 | ||
2700 | while (biolist) { | |
2701 | bio = biolist; | |
2702 | biolist = biolist->bi_next; | |
2703 | ||
2704 | bio->bi_next = NULL; | |
2705 | r10_bio = bio->bi_private; | |
2706 | r10_bio->sectors = nr_sectors; | |
2707 | ||
2708 | if (bio->bi_end_io == end_sync_read) { | |
2709 | md_sync_acct(bio->bi_bdev, nr_sectors); | |
2710 | generic_make_request(bio); | |
2711 | } | |
2712 | } | |
2713 | ||
57afd89f N |
2714 | if (sectors_skipped) |
2715 | /* pretend they weren't skipped, it makes | |
2716 | * no important difference in this case | |
2717 | */ | |
2718 | md_done_sync(mddev, sectors_skipped, 1); | |
2719 | ||
1da177e4 LT |
2720 | return sectors_skipped + nr_sectors; |
2721 | giveup: | |
2722 | /* There is nowhere to write, so all non-sync | |
e875ecea N |
2723 | * drives must be failed or in resync, all drives |
2724 | * have a bad block, so try the next chunk... | |
1da177e4 | 2725 | */ |
09b4068a N |
2726 | if (sector_nr + max_sync < max_sector) |
2727 | max_sector = sector_nr + max_sync; | |
2728 | ||
2729 | sectors_skipped += (max_sector - sector_nr); | |
1da177e4 LT |
2730 | chunks_skipped ++; |
2731 | sector_nr = max_sector; | |
1da177e4 | 2732 | goto skipped; |
1da177e4 LT |
2733 | } |
2734 | ||
80c3a6ce | 2735 | static sector_t |
fd01b88c | 2736 | raid10_size(struct mddev *mddev, sector_t sectors, int raid_disks) |
80c3a6ce DW |
2737 | { |
2738 | sector_t size; | |
e879a879 | 2739 | struct r10conf *conf = mddev->private; |
80c3a6ce DW |
2740 | |
2741 | if (!raid_disks) | |
84707f38 | 2742 | raid_disks = conf->raid_disks; |
80c3a6ce | 2743 | if (!sectors) |
dab8b292 | 2744 | sectors = conf->dev_sectors; |
80c3a6ce DW |
2745 | |
2746 | size = sectors >> conf->chunk_shift; | |
2747 | sector_div(size, conf->far_copies); | |
2748 | size = size * raid_disks; | |
2749 | sector_div(size, conf->near_copies); | |
2750 | ||
2751 | return size << conf->chunk_shift; | |
2752 | } | |
2753 | ||
dab8b292 | 2754 | |
e879a879 | 2755 | static struct r10conf *setup_conf(struct mddev *mddev) |
1da177e4 | 2756 | { |
e879a879 | 2757 | struct r10conf *conf = NULL; |
c93983bf | 2758 | int nc, fc, fo; |
1da177e4 | 2759 | sector_t stride, size; |
dab8b292 | 2760 | int err = -EINVAL; |
1da177e4 | 2761 | |
f73ea873 MT |
2762 | if (mddev->new_chunk_sectors < (PAGE_SIZE >> 9) || |
2763 | !is_power_of_2(mddev->new_chunk_sectors)) { | |
128595ed N |
2764 | printk(KERN_ERR "md/raid10:%s: chunk size must be " |
2765 | "at least PAGE_SIZE(%ld) and be a power of 2.\n", | |
2766 | mdname(mddev), PAGE_SIZE); | |
dab8b292 | 2767 | goto out; |
1da177e4 | 2768 | } |
2604b703 | 2769 | |
f73ea873 MT |
2770 | nc = mddev->new_layout & 255; |
2771 | fc = (mddev->new_layout >> 8) & 255; | |
2772 | fo = mddev->new_layout & (1<<16); | |
dab8b292 | 2773 | |
1da177e4 | 2774 | if ((nc*fc) <2 || (nc*fc) > mddev->raid_disks || |
f73ea873 | 2775 | (mddev->new_layout >> 17)) { |
128595ed | 2776 | printk(KERN_ERR "md/raid10:%s: unsupported raid10 layout: 0x%8x\n", |
f73ea873 | 2777 | mdname(mddev), mddev->new_layout); |
1da177e4 LT |
2778 | goto out; |
2779 | } | |
dab8b292 TM |
2780 | |
2781 | err = -ENOMEM; | |
e879a879 | 2782 | conf = kzalloc(sizeof(struct r10conf), GFP_KERNEL); |
dab8b292 | 2783 | if (!conf) |
1da177e4 | 2784 | goto out; |
dab8b292 | 2785 | |
4443ae10 | 2786 | conf->mirrors = kzalloc(sizeof(struct mirror_info)*mddev->raid_disks, |
dab8b292 TM |
2787 | GFP_KERNEL); |
2788 | if (!conf->mirrors) | |
2789 | goto out; | |
4443ae10 N |
2790 | |
2791 | conf->tmppage = alloc_page(GFP_KERNEL); | |
2792 | if (!conf->tmppage) | |
dab8b292 TM |
2793 | goto out; |
2794 | ||
1da177e4 | 2795 | |
64a742bc | 2796 | conf->raid_disks = mddev->raid_disks; |
1da177e4 LT |
2797 | conf->near_copies = nc; |
2798 | conf->far_copies = fc; | |
2799 | conf->copies = nc*fc; | |
c93983bf | 2800 | conf->far_offset = fo; |
dab8b292 TM |
2801 | conf->chunk_mask = mddev->new_chunk_sectors - 1; |
2802 | conf->chunk_shift = ffz(~mddev->new_chunk_sectors); | |
2803 | ||
2804 | conf->r10bio_pool = mempool_create(NR_RAID10_BIOS, r10bio_pool_alloc, | |
2805 | r10bio_pool_free, conf); | |
2806 | if (!conf->r10bio_pool) | |
2807 | goto out; | |
2808 | ||
58c0fed4 | 2809 | size = mddev->dev_sectors >> conf->chunk_shift; |
64a742bc N |
2810 | sector_div(size, fc); |
2811 | size = size * conf->raid_disks; | |
2812 | sector_div(size, nc); | |
2813 | /* 'size' is now the number of chunks in the array */ | |
2814 | /* calculate "used chunks per device" in 'stride' */ | |
2815 | stride = size * conf->copies; | |
af03b8e4 N |
2816 | |
2817 | /* We need to round up when dividing by raid_disks to | |
2818 | * get the stride size. | |
2819 | */ | |
2820 | stride += conf->raid_disks - 1; | |
64a742bc | 2821 | sector_div(stride, conf->raid_disks); |
dab8b292 TM |
2822 | |
2823 | conf->dev_sectors = stride << conf->chunk_shift; | |
64a742bc | 2824 | |
c93983bf | 2825 | if (fo) |
64a742bc N |
2826 | stride = 1; |
2827 | else | |
c93983bf | 2828 | sector_div(stride, fc); |
64a742bc N |
2829 | conf->stride = stride << conf->chunk_shift; |
2830 | ||
1da177e4 | 2831 | |
e7e72bf6 | 2832 | spin_lock_init(&conf->device_lock); |
dab8b292 TM |
2833 | INIT_LIST_HEAD(&conf->retry_list); |
2834 | ||
2835 | spin_lock_init(&conf->resync_lock); | |
2836 | init_waitqueue_head(&conf->wait_barrier); | |
2837 | ||
2838 | conf->thread = md_register_thread(raid10d, mddev, NULL); | |
2839 | if (!conf->thread) | |
2840 | goto out; | |
2841 | ||
dab8b292 TM |
2842 | conf->mddev = mddev; |
2843 | return conf; | |
2844 | ||
2845 | out: | |
128595ed | 2846 | printk(KERN_ERR "md/raid10:%s: couldn't allocate memory.\n", |
dab8b292 TM |
2847 | mdname(mddev)); |
2848 | if (conf) { | |
2849 | if (conf->r10bio_pool) | |
2850 | mempool_destroy(conf->r10bio_pool); | |
2851 | kfree(conf->mirrors); | |
2852 | safe_put_page(conf->tmppage); | |
2853 | kfree(conf); | |
2854 | } | |
2855 | return ERR_PTR(err); | |
2856 | } | |
2857 | ||
fd01b88c | 2858 | static int run(struct mddev *mddev) |
dab8b292 | 2859 | { |
e879a879 | 2860 | struct r10conf *conf; |
dab8b292 | 2861 | int i, disk_idx, chunk_size; |
0f6d02d5 | 2862 | struct mirror_info *disk; |
3cb03002 | 2863 | struct md_rdev *rdev; |
dab8b292 TM |
2864 | sector_t size; |
2865 | ||
2866 | /* | |
2867 | * copy the already verified devices into our private RAID10 | |
2868 | * bookkeeping area. [whatever we allocate in run(), | |
2869 | * should be freed in stop()] | |
2870 | */ | |
2871 | ||
2872 | if (mddev->private == NULL) { | |
2873 | conf = setup_conf(mddev); | |
2874 | if (IS_ERR(conf)) | |
2875 | return PTR_ERR(conf); | |
2876 | mddev->private = conf; | |
2877 | } | |
2878 | conf = mddev->private; | |
2879 | if (!conf) | |
2880 | goto out; | |
2881 | ||
dab8b292 TM |
2882 | mddev->thread = conf->thread; |
2883 | conf->thread = NULL; | |
2884 | ||
8f6c2e4b MP |
2885 | chunk_size = mddev->chunk_sectors << 9; |
2886 | blk_queue_io_min(mddev->queue, chunk_size); | |
2887 | if (conf->raid_disks % conf->near_copies) | |
2888 | blk_queue_io_opt(mddev->queue, chunk_size * conf->raid_disks); | |
2889 | else | |
2890 | blk_queue_io_opt(mddev->queue, chunk_size * | |
2891 | (conf->raid_disks / conf->near_copies)); | |
2892 | ||
159ec1fc | 2893 | list_for_each_entry(rdev, &mddev->disks, same_set) { |
34b343cf | 2894 | |
1da177e4 | 2895 | disk_idx = rdev->raid_disk; |
84707f38 | 2896 | if (disk_idx >= conf->raid_disks |
1da177e4 LT |
2897 | || disk_idx < 0) |
2898 | continue; | |
2899 | disk = conf->mirrors + disk_idx; | |
2900 | ||
2901 | disk->rdev = rdev; | |
8f6c2e4b MP |
2902 | disk_stack_limits(mddev->gendisk, rdev->bdev, |
2903 | rdev->data_offset << 9); | |
1da177e4 | 2904 | /* as we don't honour merge_bvec_fn, we must never risk |
627a2d3c N |
2905 | * violating it, so limit max_segments to 1 lying |
2906 | * within a single page. | |
1da177e4 | 2907 | */ |
627a2d3c N |
2908 | if (rdev->bdev->bd_disk->queue->merge_bvec_fn) { |
2909 | blk_queue_max_segments(mddev->queue, 1); | |
2910 | blk_queue_segment_boundary(mddev->queue, | |
2911 | PAGE_CACHE_SIZE - 1); | |
2912 | } | |
1da177e4 LT |
2913 | |
2914 | disk->head_position = 0; | |
1da177e4 | 2915 | } |
6d508242 | 2916 | /* need to check that every block has at least one working mirror */ |
700c7213 | 2917 | if (!enough(conf, -1)) { |
128595ed | 2918 | printk(KERN_ERR "md/raid10:%s: not enough operational mirrors.\n", |
6d508242 | 2919 | mdname(mddev)); |
1da177e4 LT |
2920 | goto out_free_conf; |
2921 | } | |
2922 | ||
2923 | mddev->degraded = 0; | |
2924 | for (i = 0; i < conf->raid_disks; i++) { | |
2925 | ||
2926 | disk = conf->mirrors + i; | |
2927 | ||
5fd6c1dc | 2928 | if (!disk->rdev || |
2e333e89 | 2929 | !test_bit(In_sync, &disk->rdev->flags)) { |
1da177e4 LT |
2930 | disk->head_position = 0; |
2931 | mddev->degraded++; | |
8c2e870a NB |
2932 | if (disk->rdev) |
2933 | conf->fullsync = 1; | |
1da177e4 | 2934 | } |
d890fa2b | 2935 | disk->recovery_disabled = mddev->recovery_disabled - 1; |
1da177e4 LT |
2936 | } |
2937 | ||
8c6ac868 | 2938 | if (mddev->recovery_cp != MaxSector) |
128595ed | 2939 | printk(KERN_NOTICE "md/raid10:%s: not clean" |
8c6ac868 AN |
2940 | " -- starting background reconstruction\n", |
2941 | mdname(mddev)); | |
1da177e4 | 2942 | printk(KERN_INFO |
128595ed | 2943 | "md/raid10:%s: active with %d out of %d devices\n", |
84707f38 N |
2944 | mdname(mddev), conf->raid_disks - mddev->degraded, |
2945 | conf->raid_disks); | |
1da177e4 LT |
2946 | /* |
2947 | * Ok, everything is just fine now | |
2948 | */ | |
dab8b292 TM |
2949 | mddev->dev_sectors = conf->dev_sectors; |
2950 | size = raid10_size(mddev, 0, 0); | |
2951 | md_set_array_sectors(mddev, size); | |
2952 | mddev->resync_max_sectors = size; | |
1da177e4 | 2953 | |
0d129228 N |
2954 | mddev->queue->backing_dev_info.congested_fn = raid10_congested; |
2955 | mddev->queue->backing_dev_info.congested_data = mddev; | |
7a5febe9 | 2956 | |
1da177e4 LT |
2957 | /* Calculate max read-ahead size. |
2958 | * We need to readahead at least twice a whole stripe.... | |
2959 | * maybe... | |
2960 | */ | |
2961 | { | |
9d8f0363 AN |
2962 | int stripe = conf->raid_disks * |
2963 | ((mddev->chunk_sectors << 9) / PAGE_SIZE); | |
1da177e4 LT |
2964 | stripe /= conf->near_copies; |
2965 | if (mddev->queue->backing_dev_info.ra_pages < 2* stripe) | |
2966 | mddev->queue->backing_dev_info.ra_pages = 2* stripe; | |
2967 | } | |
2968 | ||
84707f38 | 2969 | if (conf->near_copies < conf->raid_disks) |
1da177e4 | 2970 | blk_queue_merge_bvec(mddev->queue, raid10_mergeable_bvec); |
a91a2785 MP |
2971 | |
2972 | if (md_integrity_register(mddev)) | |
2973 | goto out_free_conf; | |
2974 | ||
1da177e4 LT |
2975 | return 0; |
2976 | ||
2977 | out_free_conf: | |
01f96c0a | 2978 | md_unregister_thread(&mddev->thread); |
1da177e4 LT |
2979 | if (conf->r10bio_pool) |
2980 | mempool_destroy(conf->r10bio_pool); | |
1345b1d8 | 2981 | safe_put_page(conf->tmppage); |
990a8baf | 2982 | kfree(conf->mirrors); |
1da177e4 LT |
2983 | kfree(conf); |
2984 | mddev->private = NULL; | |
2985 | out: | |
2986 | return -EIO; | |
2987 | } | |
2988 | ||
fd01b88c | 2989 | static int stop(struct mddev *mddev) |
1da177e4 | 2990 | { |
e879a879 | 2991 | struct r10conf *conf = mddev->private; |
1da177e4 | 2992 | |
409c57f3 N |
2993 | raise_barrier(conf, 0); |
2994 | lower_barrier(conf); | |
2995 | ||
01f96c0a | 2996 | md_unregister_thread(&mddev->thread); |
1da177e4 LT |
2997 | blk_sync_queue(mddev->queue); /* the unplug fn references 'conf'*/ |
2998 | if (conf->r10bio_pool) | |
2999 | mempool_destroy(conf->r10bio_pool); | |
990a8baf | 3000 | kfree(conf->mirrors); |
1da177e4 LT |
3001 | kfree(conf); |
3002 | mddev->private = NULL; | |
3003 | return 0; | |
3004 | } | |
3005 | ||
fd01b88c | 3006 | static void raid10_quiesce(struct mddev *mddev, int state) |
6cce3b23 | 3007 | { |
e879a879 | 3008 | struct r10conf *conf = mddev->private; |
6cce3b23 N |
3009 | |
3010 | switch(state) { | |
3011 | case 1: | |
3012 | raise_barrier(conf, 0); | |
3013 | break; | |
3014 | case 0: | |
3015 | lower_barrier(conf); | |
3016 | break; | |
3017 | } | |
6cce3b23 | 3018 | } |
1da177e4 | 3019 | |
fd01b88c | 3020 | static void *raid10_takeover_raid0(struct mddev *mddev) |
dab8b292 | 3021 | { |
3cb03002 | 3022 | struct md_rdev *rdev; |
e879a879 | 3023 | struct r10conf *conf; |
dab8b292 TM |
3024 | |
3025 | if (mddev->degraded > 0) { | |
128595ed N |
3026 | printk(KERN_ERR "md/raid10:%s: Error: degraded raid0!\n", |
3027 | mdname(mddev)); | |
dab8b292 TM |
3028 | return ERR_PTR(-EINVAL); |
3029 | } | |
3030 | ||
dab8b292 TM |
3031 | /* Set new parameters */ |
3032 | mddev->new_level = 10; | |
3033 | /* new layout: far_copies = 1, near_copies = 2 */ | |
3034 | mddev->new_layout = (1<<8) + 2; | |
3035 | mddev->new_chunk_sectors = mddev->chunk_sectors; | |
3036 | mddev->delta_disks = mddev->raid_disks; | |
dab8b292 TM |
3037 | mddev->raid_disks *= 2; |
3038 | /* make sure it will be not marked as dirty */ | |
3039 | mddev->recovery_cp = MaxSector; | |
3040 | ||
3041 | conf = setup_conf(mddev); | |
02214dc5 | 3042 | if (!IS_ERR(conf)) { |
e93f68a1 N |
3043 | list_for_each_entry(rdev, &mddev->disks, same_set) |
3044 | if (rdev->raid_disk >= 0) | |
3045 | rdev->new_raid_disk = rdev->raid_disk * 2; | |
02214dc5 KW |
3046 | conf->barrier = 1; |
3047 | } | |
3048 | ||
dab8b292 TM |
3049 | return conf; |
3050 | } | |
3051 | ||
fd01b88c | 3052 | static void *raid10_takeover(struct mddev *mddev) |
dab8b292 | 3053 | { |
e373ab10 | 3054 | struct r0conf *raid0_conf; |
dab8b292 TM |
3055 | |
3056 | /* raid10 can take over: | |
3057 | * raid0 - providing it has only two drives | |
3058 | */ | |
3059 | if (mddev->level == 0) { | |
3060 | /* for raid0 takeover only one zone is supported */ | |
e373ab10 N |
3061 | raid0_conf = mddev->private; |
3062 | if (raid0_conf->nr_strip_zones > 1) { | |
128595ed N |
3063 | printk(KERN_ERR "md/raid10:%s: cannot takeover raid 0" |
3064 | " with more than one zone.\n", | |
3065 | mdname(mddev)); | |
dab8b292 TM |
3066 | return ERR_PTR(-EINVAL); |
3067 | } | |
3068 | return raid10_takeover_raid0(mddev); | |
3069 | } | |
3070 | return ERR_PTR(-EINVAL); | |
3071 | } | |
3072 | ||
84fc4b56 | 3073 | static struct md_personality raid10_personality = |
1da177e4 LT |
3074 | { |
3075 | .name = "raid10", | |
2604b703 | 3076 | .level = 10, |
1da177e4 LT |
3077 | .owner = THIS_MODULE, |
3078 | .make_request = make_request, | |
3079 | .run = run, | |
3080 | .stop = stop, | |
3081 | .status = status, | |
3082 | .error_handler = error, | |
3083 | .hot_add_disk = raid10_add_disk, | |
3084 | .hot_remove_disk= raid10_remove_disk, | |
3085 | .spare_active = raid10_spare_active, | |
3086 | .sync_request = sync_request, | |
6cce3b23 | 3087 | .quiesce = raid10_quiesce, |
80c3a6ce | 3088 | .size = raid10_size, |
dab8b292 | 3089 | .takeover = raid10_takeover, |
1da177e4 LT |
3090 | }; |
3091 | ||
3092 | static int __init raid_init(void) | |
3093 | { | |
2604b703 | 3094 | return register_md_personality(&raid10_personality); |
1da177e4 LT |
3095 | } |
3096 | ||
3097 | static void raid_exit(void) | |
3098 | { | |
2604b703 | 3099 | unregister_md_personality(&raid10_personality); |
1da177e4 LT |
3100 | } |
3101 | ||
3102 | module_init(raid_init); | |
3103 | module_exit(raid_exit); | |
3104 | MODULE_LICENSE("GPL"); | |
0efb9e61 | 3105 | MODULE_DESCRIPTION("RAID10 (striped mirror) personality for MD"); |
1da177e4 | 3106 | MODULE_ALIAS("md-personality-9"); /* RAID10 */ |
d9d166c2 | 3107 | MODULE_ALIAS("md-raid10"); |
2604b703 | 3108 | MODULE_ALIAS("md-level-10"); |
34db0cd6 N |
3109 | |
3110 | module_param(max_queued_requests, int, S_IRUGO|S_IWUSR); |