Commit | Line | Data |
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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> |
056075c7 | 24 | #include <linux/module.h> |
bff61975 | 25 | #include <linux/seq_file.h> |
8bda470e | 26 | #include <linux/ratelimit.h> |
3ea7daa5 | 27 | #include <linux/kthread.h> |
43b2e5d8 | 28 | #include "md.h" |
ef740c37 | 29 | #include "raid10.h" |
dab8b292 | 30 | #include "raid0.h" |
ef740c37 | 31 | #include "bitmap.h" |
1da177e4 LT |
32 | |
33 | /* | |
34 | * RAID10 provides a combination of RAID0 and RAID1 functionality. | |
35 | * The layout of data is defined by | |
36 | * chunk_size | |
37 | * raid_disks | |
38 | * near_copies (stored in low byte of layout) | |
39 | * far_copies (stored in second byte of layout) | |
c93983bf | 40 | * far_offset (stored in bit 16 of layout ) |
475901af | 41 | * use_far_sets (stored in bit 17 of layout ) |
1da177e4 | 42 | * |
475901af JB |
43 | * The data to be stored is divided into chunks using chunksize. Each device |
44 | * is divided into far_copies sections. In each section, chunks are laid out | |
45 | * in a style similar to raid0, but near_copies copies of each chunk is stored | |
46 | * (each on a different drive). The starting device for each section is offset | |
47 | * near_copies from the starting device of the previous section. Thus there | |
48 | * are (near_copies * far_copies) of each chunk, and each is on a different | |
49 | * drive. near_copies and far_copies must be at least one, and their product | |
50 | * is at most raid_disks. | |
c93983bf N |
51 | * |
52 | * If far_offset is true, then the far_copies are handled a bit differently. | |
475901af JB |
53 | * The copies are still in different stripes, but instead of being very far |
54 | * apart on disk, there are adjacent stripes. | |
55 | * | |
56 | * The far and offset algorithms are handled slightly differently if | |
57 | * 'use_far_sets' is true. In this case, the array's devices are grouped into | |
58 | * sets that are (near_copies * far_copies) in size. The far copied stripes | |
59 | * are still shifted by 'near_copies' devices, but this shifting stays confined | |
60 | * to the set rather than the entire array. This is done to improve the number | |
61 | * of device combinations that can fail without causing the array to fail. | |
62 | * Example 'far' algorithm w/o 'use_far_sets' (each letter represents a chunk | |
63 | * on a device): | |
64 | * A B C D A B C D E | |
65 | * ... ... | |
66 | * D A B C E A B C D | |
67 | * Example 'far' algorithm w/ 'use_far_sets' enabled (sets illustrated w/ []'s): | |
68 | * [A B] [C D] [A B] [C D E] | |
69 | * |...| |...| |...| | ... | | |
70 | * [B A] [D C] [B A] [E C D] | |
1da177e4 LT |
71 | */ |
72 | ||
73 | /* | |
74 | * Number of guaranteed r10bios in case of extreme VM load: | |
75 | */ | |
76 | #define NR_RAID10_BIOS 256 | |
77 | ||
473e87ce JB |
78 | /* when we get a read error on a read-only array, we redirect to another |
79 | * device without failing the first device, or trying to over-write to | |
80 | * correct the read error. To keep track of bad blocks on a per-bio | |
81 | * level, we store IO_BLOCKED in the appropriate 'bios' pointer | |
82 | */ | |
83 | #define IO_BLOCKED ((struct bio *)1) | |
84 | /* When we successfully write to a known bad-block, we need to remove the | |
85 | * bad-block marking which must be done from process context. So we record | |
86 | * the success by setting devs[n].bio to IO_MADE_GOOD | |
87 | */ | |
88 | #define IO_MADE_GOOD ((struct bio *)2) | |
89 | ||
90 | #define BIO_SPECIAL(bio) ((unsigned long)bio <= 2) | |
91 | ||
92 | /* When there are this many requests queued to be written by | |
34db0cd6 N |
93 | * the raid10 thread, we become 'congested' to provide back-pressure |
94 | * for writeback. | |
95 | */ | |
96 | static int max_queued_requests = 1024; | |
97 | ||
e879a879 N |
98 | static void allow_barrier(struct r10conf *conf); |
99 | static void lower_barrier(struct r10conf *conf); | |
635f6416 | 100 | static int _enough(struct r10conf *conf, int previous, int ignore); |
3ea7daa5 N |
101 | static sector_t reshape_request(struct mddev *mddev, sector_t sector_nr, |
102 | int *skipped); | |
103 | static void reshape_request_write(struct mddev *mddev, struct r10bio *r10_bio); | |
104 | static void end_reshape_write(struct bio *bio, int error); | |
105 | static void end_reshape(struct r10conf *conf); | |
0a27ec96 | 106 | |
dd0fc66f | 107 | static void * r10bio_pool_alloc(gfp_t gfp_flags, void *data) |
1da177e4 | 108 | { |
e879a879 | 109 | struct r10conf *conf = data; |
9f2c9d12 | 110 | int size = offsetof(struct r10bio, devs[conf->copies]); |
1da177e4 | 111 | |
69335ef3 N |
112 | /* allocate a r10bio with room for raid_disks entries in the |
113 | * bios array */ | |
7eaceacc | 114 | return kzalloc(size, gfp_flags); |
1da177e4 LT |
115 | } |
116 | ||
117 | static void r10bio_pool_free(void *r10_bio, void *data) | |
118 | { | |
119 | kfree(r10_bio); | |
120 | } | |
121 | ||
0310fa21 | 122 | /* Maximum size of each resync request */ |
1da177e4 | 123 | #define RESYNC_BLOCK_SIZE (64*1024) |
1da177e4 | 124 | #define RESYNC_PAGES ((RESYNC_BLOCK_SIZE + PAGE_SIZE-1) / PAGE_SIZE) |
0310fa21 N |
125 | /* amount of memory to reserve for resync requests */ |
126 | #define RESYNC_WINDOW (1024*1024) | |
127 | /* maximum number of concurrent requests, memory permitting */ | |
128 | #define RESYNC_DEPTH (32*1024*1024/RESYNC_BLOCK_SIZE) | |
1da177e4 LT |
129 | |
130 | /* | |
131 | * When performing a resync, we need to read and compare, so | |
132 | * we need as many pages are there are copies. | |
133 | * When performing a recovery, we need 2 bios, one for read, | |
134 | * one for write (we recover only one drive per r10buf) | |
135 | * | |
136 | */ | |
dd0fc66f | 137 | static void * r10buf_pool_alloc(gfp_t gfp_flags, void *data) |
1da177e4 | 138 | { |
e879a879 | 139 | struct r10conf *conf = data; |
1da177e4 | 140 | struct page *page; |
9f2c9d12 | 141 | struct r10bio *r10_bio; |
1da177e4 LT |
142 | struct bio *bio; |
143 | int i, j; | |
144 | int nalloc; | |
145 | ||
146 | r10_bio = r10bio_pool_alloc(gfp_flags, conf); | |
7eaceacc | 147 | if (!r10_bio) |
1da177e4 | 148 | return NULL; |
1da177e4 | 149 | |
3ea7daa5 N |
150 | if (test_bit(MD_RECOVERY_SYNC, &conf->mddev->recovery) || |
151 | test_bit(MD_RECOVERY_RESHAPE, &conf->mddev->recovery)) | |
1da177e4 LT |
152 | nalloc = conf->copies; /* resync */ |
153 | else | |
154 | nalloc = 2; /* recovery */ | |
155 | ||
156 | /* | |
157 | * Allocate bios. | |
158 | */ | |
159 | for (j = nalloc ; j-- ; ) { | |
6746557f | 160 | bio = bio_kmalloc(gfp_flags, RESYNC_PAGES); |
1da177e4 LT |
161 | if (!bio) |
162 | goto out_free_bio; | |
163 | r10_bio->devs[j].bio = bio; | |
69335ef3 N |
164 | if (!conf->have_replacement) |
165 | continue; | |
166 | bio = bio_kmalloc(gfp_flags, RESYNC_PAGES); | |
167 | if (!bio) | |
168 | goto out_free_bio; | |
169 | r10_bio->devs[j].repl_bio = bio; | |
1da177e4 LT |
170 | } |
171 | /* | |
172 | * Allocate RESYNC_PAGES data pages and attach them | |
173 | * where needed. | |
174 | */ | |
175 | for (j = 0 ; j < nalloc; j++) { | |
69335ef3 | 176 | struct bio *rbio = r10_bio->devs[j].repl_bio; |
1da177e4 LT |
177 | bio = r10_bio->devs[j].bio; |
178 | for (i = 0; i < RESYNC_PAGES; i++) { | |
3ea7daa5 N |
179 | if (j > 0 && !test_bit(MD_RECOVERY_SYNC, |
180 | &conf->mddev->recovery)) { | |
181 | /* we can share bv_page's during recovery | |
182 | * and reshape */ | |
c65060ad NK |
183 | struct bio *rbio = r10_bio->devs[0].bio; |
184 | page = rbio->bi_io_vec[i].bv_page; | |
185 | get_page(page); | |
186 | } else | |
187 | page = alloc_page(gfp_flags); | |
1da177e4 LT |
188 | if (unlikely(!page)) |
189 | goto out_free_pages; | |
190 | ||
191 | bio->bi_io_vec[i].bv_page = page; | |
69335ef3 N |
192 | if (rbio) |
193 | rbio->bi_io_vec[i].bv_page = page; | |
1da177e4 LT |
194 | } |
195 | } | |
196 | ||
197 | return r10_bio; | |
198 | ||
199 | out_free_pages: | |
200 | for ( ; i > 0 ; i--) | |
1345b1d8 | 201 | safe_put_page(bio->bi_io_vec[i-1].bv_page); |
1da177e4 LT |
202 | while (j--) |
203 | for (i = 0; i < RESYNC_PAGES ; i++) | |
1345b1d8 | 204 | safe_put_page(r10_bio->devs[j].bio->bi_io_vec[i].bv_page); |
5fdd2cf8 | 205 | j = 0; |
1da177e4 | 206 | out_free_bio: |
5fdd2cf8 | 207 | for ( ; j < nalloc; j++) { |
208 | if (r10_bio->devs[j].bio) | |
209 | bio_put(r10_bio->devs[j].bio); | |
69335ef3 N |
210 | if (r10_bio->devs[j].repl_bio) |
211 | bio_put(r10_bio->devs[j].repl_bio); | |
212 | } | |
1da177e4 LT |
213 | r10bio_pool_free(r10_bio, conf); |
214 | return NULL; | |
215 | } | |
216 | ||
217 | static void r10buf_pool_free(void *__r10_bio, void *data) | |
218 | { | |
219 | int i; | |
e879a879 | 220 | struct r10conf *conf = data; |
9f2c9d12 | 221 | struct r10bio *r10bio = __r10_bio; |
1da177e4 LT |
222 | int j; |
223 | ||
224 | for (j=0; j < conf->copies; j++) { | |
225 | struct bio *bio = r10bio->devs[j].bio; | |
226 | if (bio) { | |
227 | for (i = 0; i < RESYNC_PAGES; i++) { | |
1345b1d8 | 228 | safe_put_page(bio->bi_io_vec[i].bv_page); |
1da177e4 LT |
229 | bio->bi_io_vec[i].bv_page = NULL; |
230 | } | |
231 | bio_put(bio); | |
232 | } | |
69335ef3 N |
233 | bio = r10bio->devs[j].repl_bio; |
234 | if (bio) | |
235 | bio_put(bio); | |
1da177e4 LT |
236 | } |
237 | r10bio_pool_free(r10bio, conf); | |
238 | } | |
239 | ||
e879a879 | 240 | static void put_all_bios(struct r10conf *conf, struct r10bio *r10_bio) |
1da177e4 LT |
241 | { |
242 | int i; | |
243 | ||
244 | for (i = 0; i < conf->copies; i++) { | |
245 | struct bio **bio = & r10_bio->devs[i].bio; | |
749c55e9 | 246 | if (!BIO_SPECIAL(*bio)) |
1da177e4 LT |
247 | bio_put(*bio); |
248 | *bio = NULL; | |
69335ef3 N |
249 | bio = &r10_bio->devs[i].repl_bio; |
250 | if (r10_bio->read_slot < 0 && !BIO_SPECIAL(*bio)) | |
251 | bio_put(*bio); | |
252 | *bio = NULL; | |
1da177e4 LT |
253 | } |
254 | } | |
255 | ||
9f2c9d12 | 256 | static void free_r10bio(struct r10bio *r10_bio) |
1da177e4 | 257 | { |
e879a879 | 258 | struct r10conf *conf = r10_bio->mddev->private; |
1da177e4 | 259 | |
1da177e4 LT |
260 | put_all_bios(conf, r10_bio); |
261 | mempool_free(r10_bio, conf->r10bio_pool); | |
262 | } | |
263 | ||
9f2c9d12 | 264 | static void put_buf(struct r10bio *r10_bio) |
1da177e4 | 265 | { |
e879a879 | 266 | struct r10conf *conf = r10_bio->mddev->private; |
1da177e4 LT |
267 | |
268 | mempool_free(r10_bio, conf->r10buf_pool); | |
269 | ||
0a27ec96 | 270 | lower_barrier(conf); |
1da177e4 LT |
271 | } |
272 | ||
9f2c9d12 | 273 | static void reschedule_retry(struct r10bio *r10_bio) |
1da177e4 LT |
274 | { |
275 | unsigned long flags; | |
fd01b88c | 276 | struct mddev *mddev = r10_bio->mddev; |
e879a879 | 277 | struct r10conf *conf = mddev->private; |
1da177e4 LT |
278 | |
279 | spin_lock_irqsave(&conf->device_lock, flags); | |
280 | list_add(&r10_bio->retry_list, &conf->retry_list); | |
4443ae10 | 281 | conf->nr_queued ++; |
1da177e4 LT |
282 | spin_unlock_irqrestore(&conf->device_lock, flags); |
283 | ||
388667be AJ |
284 | /* wake up frozen array... */ |
285 | wake_up(&conf->wait_barrier); | |
286 | ||
1da177e4 LT |
287 | md_wakeup_thread(mddev->thread); |
288 | } | |
289 | ||
290 | /* | |
291 | * raid_end_bio_io() is called when we have finished servicing a mirrored | |
292 | * operation and are ready to return a success/failure code to the buffer | |
293 | * cache layer. | |
294 | */ | |
9f2c9d12 | 295 | static void raid_end_bio_io(struct r10bio *r10_bio) |
1da177e4 LT |
296 | { |
297 | struct bio *bio = r10_bio->master_bio; | |
856e08e2 | 298 | int done; |
e879a879 | 299 | struct r10conf *conf = r10_bio->mddev->private; |
1da177e4 | 300 | |
856e08e2 N |
301 | if (bio->bi_phys_segments) { |
302 | unsigned long flags; | |
303 | spin_lock_irqsave(&conf->device_lock, flags); | |
304 | bio->bi_phys_segments--; | |
305 | done = (bio->bi_phys_segments == 0); | |
306 | spin_unlock_irqrestore(&conf->device_lock, flags); | |
307 | } else | |
308 | done = 1; | |
309 | if (!test_bit(R10BIO_Uptodate, &r10_bio->state)) | |
310 | clear_bit(BIO_UPTODATE, &bio->bi_flags); | |
311 | if (done) { | |
312 | bio_endio(bio, 0); | |
313 | /* | |
314 | * Wake up any possible resync thread that waits for the device | |
315 | * to go idle. | |
316 | */ | |
317 | allow_barrier(conf); | |
318 | } | |
1da177e4 LT |
319 | free_r10bio(r10_bio); |
320 | } | |
321 | ||
322 | /* | |
323 | * Update disk head position estimator based on IRQ completion info. | |
324 | */ | |
9f2c9d12 | 325 | static inline void update_head_pos(int slot, struct r10bio *r10_bio) |
1da177e4 | 326 | { |
e879a879 | 327 | struct r10conf *conf = r10_bio->mddev->private; |
1da177e4 LT |
328 | |
329 | conf->mirrors[r10_bio->devs[slot].devnum].head_position = | |
330 | r10_bio->devs[slot].addr + (r10_bio->sectors); | |
331 | } | |
332 | ||
778ca018 NK |
333 | /* |
334 | * Find the disk number which triggered given bio | |
335 | */ | |
e879a879 | 336 | static int find_bio_disk(struct r10conf *conf, struct r10bio *r10_bio, |
69335ef3 | 337 | struct bio *bio, int *slotp, int *replp) |
778ca018 NK |
338 | { |
339 | int slot; | |
69335ef3 | 340 | int repl = 0; |
778ca018 | 341 | |
69335ef3 | 342 | for (slot = 0; slot < conf->copies; slot++) { |
778ca018 NK |
343 | if (r10_bio->devs[slot].bio == bio) |
344 | break; | |
69335ef3 N |
345 | if (r10_bio->devs[slot].repl_bio == bio) { |
346 | repl = 1; | |
347 | break; | |
348 | } | |
349 | } | |
778ca018 NK |
350 | |
351 | BUG_ON(slot == conf->copies); | |
352 | update_head_pos(slot, r10_bio); | |
353 | ||
749c55e9 N |
354 | if (slotp) |
355 | *slotp = slot; | |
69335ef3 N |
356 | if (replp) |
357 | *replp = repl; | |
778ca018 NK |
358 | return r10_bio->devs[slot].devnum; |
359 | } | |
360 | ||
6712ecf8 | 361 | static void raid10_end_read_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; |
1da177e4 | 365 | int slot, dev; |
abbf098e | 366 | struct md_rdev *rdev; |
e879a879 | 367 | struct r10conf *conf = r10_bio->mddev->private; |
1da177e4 | 368 | |
1da177e4 LT |
369 | |
370 | slot = r10_bio->read_slot; | |
371 | dev = r10_bio->devs[slot].devnum; | |
abbf098e | 372 | rdev = r10_bio->devs[slot].rdev; |
1da177e4 LT |
373 | /* |
374 | * this branch is our 'one mirror IO has finished' event handler: | |
375 | */ | |
4443ae10 N |
376 | update_head_pos(slot, r10_bio); |
377 | ||
378 | if (uptodate) { | |
1da177e4 LT |
379 | /* |
380 | * Set R10BIO_Uptodate in our master bio, so that | |
381 | * we will return a good error code to the higher | |
382 | * levels even if IO on some other mirrored buffer fails. | |
383 | * | |
384 | * The 'master' represents the composite IO operation to | |
385 | * user-side. So if something waits for IO, then it will | |
386 | * wait for the 'master' bio. | |
387 | */ | |
388 | set_bit(R10BIO_Uptodate, &r10_bio->state); | |
fae8cc5e N |
389 | } else { |
390 | /* If all other devices that store this block have | |
391 | * failed, we want to return the error upwards rather | |
392 | * than fail the last device. Here we redefine | |
393 | * "uptodate" to mean "Don't want to retry" | |
394 | */ | |
635f6416 N |
395 | if (!_enough(conf, test_bit(R10BIO_Previous, &r10_bio->state), |
396 | rdev->raid_disk)) | |
fae8cc5e | 397 | uptodate = 1; |
fae8cc5e N |
398 | } |
399 | if (uptodate) { | |
1da177e4 | 400 | raid_end_bio_io(r10_bio); |
abbf098e | 401 | rdev_dec_pending(rdev, conf->mddev); |
4443ae10 | 402 | } else { |
1da177e4 | 403 | /* |
7c4e06ff | 404 | * oops, read error - keep the refcount on the rdev |
1da177e4 LT |
405 | */ |
406 | char b[BDEVNAME_SIZE]; | |
8bda470e CD |
407 | printk_ratelimited(KERN_ERR |
408 | "md/raid10:%s: %s: rescheduling sector %llu\n", | |
409 | mdname(conf->mddev), | |
abbf098e | 410 | bdevname(rdev->bdev, b), |
8bda470e | 411 | (unsigned long long)r10_bio->sector); |
856e08e2 | 412 | set_bit(R10BIO_ReadError, &r10_bio->state); |
1da177e4 LT |
413 | reschedule_retry(r10_bio); |
414 | } | |
1da177e4 LT |
415 | } |
416 | ||
9f2c9d12 | 417 | static void close_write(struct r10bio *r10_bio) |
bd870a16 N |
418 | { |
419 | /* clear the bitmap if all writes complete successfully */ | |
420 | bitmap_endwrite(r10_bio->mddev->bitmap, r10_bio->sector, | |
421 | r10_bio->sectors, | |
422 | !test_bit(R10BIO_Degraded, &r10_bio->state), | |
423 | 0); | |
424 | md_write_end(r10_bio->mddev); | |
425 | } | |
426 | ||
9f2c9d12 | 427 | static void one_write_done(struct r10bio *r10_bio) |
19d5f834 N |
428 | { |
429 | if (atomic_dec_and_test(&r10_bio->remaining)) { | |
430 | if (test_bit(R10BIO_WriteError, &r10_bio->state)) | |
431 | reschedule_retry(r10_bio); | |
432 | else { | |
433 | close_write(r10_bio); | |
434 | if (test_bit(R10BIO_MadeGood, &r10_bio->state)) | |
435 | reschedule_retry(r10_bio); | |
436 | else | |
437 | raid_end_bio_io(r10_bio); | |
438 | } | |
439 | } | |
440 | } | |
441 | ||
6712ecf8 | 442 | static void raid10_end_write_request(struct bio *bio, int error) |
1da177e4 LT |
443 | { |
444 | int uptodate = test_bit(BIO_UPTODATE, &bio->bi_flags); | |
9f2c9d12 | 445 | struct r10bio *r10_bio = bio->bi_private; |
778ca018 | 446 | int dev; |
749c55e9 | 447 | int dec_rdev = 1; |
e879a879 | 448 | struct r10conf *conf = r10_bio->mddev->private; |
475b0321 | 449 | int slot, repl; |
4ca40c2c | 450 | struct md_rdev *rdev = NULL; |
1da177e4 | 451 | |
475b0321 | 452 | dev = find_bio_disk(conf, r10_bio, bio, &slot, &repl); |
1da177e4 | 453 | |
475b0321 N |
454 | if (repl) |
455 | rdev = conf->mirrors[dev].replacement; | |
4ca40c2c N |
456 | if (!rdev) { |
457 | smp_rmb(); | |
458 | repl = 0; | |
475b0321 | 459 | rdev = conf->mirrors[dev].rdev; |
4ca40c2c | 460 | } |
1da177e4 LT |
461 | /* |
462 | * this branch is our 'one mirror IO has finished' event handler: | |
463 | */ | |
6cce3b23 | 464 | if (!uptodate) { |
475b0321 N |
465 | if (repl) |
466 | /* Never record new bad blocks to replacement, | |
467 | * just fail it. | |
468 | */ | |
469 | md_error(rdev->mddev, rdev); | |
470 | else { | |
471 | set_bit(WriteErrorSeen, &rdev->flags); | |
b7044d41 N |
472 | if (!test_and_set_bit(WantReplacement, &rdev->flags)) |
473 | set_bit(MD_RECOVERY_NEEDED, | |
474 | &rdev->mddev->recovery); | |
475b0321 N |
475 | set_bit(R10BIO_WriteError, &r10_bio->state); |
476 | dec_rdev = 0; | |
477 | } | |
749c55e9 | 478 | } else { |
1da177e4 LT |
479 | /* |
480 | * Set R10BIO_Uptodate in our master bio, so that | |
481 | * we will return a good error code for to the higher | |
482 | * levels even if IO on some other mirrored buffer fails. | |
483 | * | |
484 | * The 'master' represents the composite IO operation to | |
485 | * user-side. So if something waits for IO, then it will | |
486 | * wait for the 'master' bio. | |
487 | */ | |
749c55e9 N |
488 | sector_t first_bad; |
489 | int bad_sectors; | |
490 | ||
3056e3ae AL |
491 | /* |
492 | * Do not set R10BIO_Uptodate if the current device is | |
493 | * rebuilding or Faulty. This is because we cannot use | |
494 | * such device for properly reading the data back (we could | |
495 | * potentially use it, if the current write would have felt | |
496 | * before rdev->recovery_offset, but for simplicity we don't | |
497 | * check this here. | |
498 | */ | |
499 | if (test_bit(In_sync, &rdev->flags) && | |
500 | !test_bit(Faulty, &rdev->flags)) | |
501 | set_bit(R10BIO_Uptodate, &r10_bio->state); | |
1da177e4 | 502 | |
749c55e9 | 503 | /* Maybe we can clear some bad blocks. */ |
475b0321 | 504 | if (is_badblock(rdev, |
749c55e9 N |
505 | r10_bio->devs[slot].addr, |
506 | r10_bio->sectors, | |
507 | &first_bad, &bad_sectors)) { | |
508 | bio_put(bio); | |
475b0321 N |
509 | if (repl) |
510 | r10_bio->devs[slot].repl_bio = IO_MADE_GOOD; | |
511 | else | |
512 | r10_bio->devs[slot].bio = IO_MADE_GOOD; | |
749c55e9 N |
513 | dec_rdev = 0; |
514 | set_bit(R10BIO_MadeGood, &r10_bio->state); | |
515 | } | |
516 | } | |
517 | ||
1da177e4 LT |
518 | /* |
519 | * | |
520 | * Let's see if all mirrored write operations have finished | |
521 | * already. | |
522 | */ | |
19d5f834 | 523 | one_write_done(r10_bio); |
749c55e9 | 524 | if (dec_rdev) |
884162df | 525 | rdev_dec_pending(rdev, conf->mddev); |
1da177e4 LT |
526 | } |
527 | ||
1da177e4 LT |
528 | /* |
529 | * RAID10 layout manager | |
25985edc | 530 | * As well as the chunksize and raid_disks count, there are two |
1da177e4 LT |
531 | * parameters: near_copies and far_copies. |
532 | * near_copies * far_copies must be <= raid_disks. | |
533 | * Normally one of these will be 1. | |
534 | * If both are 1, we get raid0. | |
535 | * If near_copies == raid_disks, we get raid1. | |
536 | * | |
25985edc | 537 | * Chunks are laid out in raid0 style with near_copies copies of the |
1da177e4 LT |
538 | * first chunk, followed by near_copies copies of the next chunk and |
539 | * so on. | |
540 | * If far_copies > 1, then after 1/far_copies of the array has been assigned | |
541 | * as described above, we start again with a device offset of near_copies. | |
542 | * So we effectively have another copy of the whole array further down all | |
543 | * the drives, but with blocks on different drives. | |
544 | * With this layout, and block is never stored twice on the one device. | |
545 | * | |
546 | * raid10_find_phys finds the sector offset of a given virtual sector | |
c93983bf | 547 | * on each device that it is on. |
1da177e4 LT |
548 | * |
549 | * raid10_find_virt does the reverse mapping, from a device and a | |
550 | * sector offset to a virtual address | |
551 | */ | |
552 | ||
f8c9e74f | 553 | static void __raid10_find_phys(struct geom *geo, struct r10bio *r10bio) |
1da177e4 LT |
554 | { |
555 | int n,f; | |
556 | sector_t sector; | |
557 | sector_t chunk; | |
558 | sector_t stripe; | |
559 | int dev; | |
1da177e4 | 560 | int slot = 0; |
9a3152ab JB |
561 | int last_far_set_start, last_far_set_size; |
562 | ||
563 | last_far_set_start = (geo->raid_disks / geo->far_set_size) - 1; | |
564 | last_far_set_start *= geo->far_set_size; | |
565 | ||
566 | last_far_set_size = geo->far_set_size; | |
567 | last_far_set_size += (geo->raid_disks % geo->far_set_size); | |
1da177e4 LT |
568 | |
569 | /* now calculate first sector/dev */ | |
5cf00fcd N |
570 | chunk = r10bio->sector >> geo->chunk_shift; |
571 | sector = r10bio->sector & geo->chunk_mask; | |
1da177e4 | 572 | |
5cf00fcd | 573 | chunk *= geo->near_copies; |
1da177e4 | 574 | stripe = chunk; |
5cf00fcd N |
575 | dev = sector_div(stripe, geo->raid_disks); |
576 | if (geo->far_offset) | |
577 | stripe *= geo->far_copies; | |
1da177e4 | 578 | |
5cf00fcd | 579 | sector += stripe << geo->chunk_shift; |
1da177e4 LT |
580 | |
581 | /* and calculate all the others */ | |
5cf00fcd | 582 | for (n = 0; n < geo->near_copies; n++) { |
1da177e4 | 583 | int d = dev; |
475901af | 584 | int set; |
1da177e4 | 585 | sector_t s = sector; |
1da177e4 | 586 | r10bio->devs[slot].devnum = d; |
4c0ca26b | 587 | r10bio->devs[slot].addr = s; |
1da177e4 LT |
588 | slot++; |
589 | ||
5cf00fcd | 590 | for (f = 1; f < geo->far_copies; f++) { |
475901af | 591 | set = d / geo->far_set_size; |
5cf00fcd | 592 | d += geo->near_copies; |
475901af | 593 | |
9a3152ab JB |
594 | if ((geo->raid_disks % geo->far_set_size) && |
595 | (d > last_far_set_start)) { | |
596 | d -= last_far_set_start; | |
597 | d %= last_far_set_size; | |
598 | d += last_far_set_start; | |
599 | } else { | |
600 | d %= geo->far_set_size; | |
601 | d += geo->far_set_size * set; | |
602 | } | |
5cf00fcd | 603 | s += geo->stride; |
1da177e4 LT |
604 | r10bio->devs[slot].devnum = d; |
605 | r10bio->devs[slot].addr = s; | |
606 | slot++; | |
607 | } | |
608 | dev++; | |
5cf00fcd | 609 | if (dev >= geo->raid_disks) { |
1da177e4 | 610 | dev = 0; |
5cf00fcd | 611 | sector += (geo->chunk_mask + 1); |
1da177e4 LT |
612 | } |
613 | } | |
f8c9e74f N |
614 | } |
615 | ||
616 | static void raid10_find_phys(struct r10conf *conf, struct r10bio *r10bio) | |
617 | { | |
618 | struct geom *geo = &conf->geo; | |
619 | ||
620 | if (conf->reshape_progress != MaxSector && | |
621 | ((r10bio->sector >= conf->reshape_progress) != | |
622 | conf->mddev->reshape_backwards)) { | |
623 | set_bit(R10BIO_Previous, &r10bio->state); | |
624 | geo = &conf->prev; | |
625 | } else | |
626 | clear_bit(R10BIO_Previous, &r10bio->state); | |
627 | ||
628 | __raid10_find_phys(geo, r10bio); | |
1da177e4 LT |
629 | } |
630 | ||
e879a879 | 631 | static sector_t raid10_find_virt(struct r10conf *conf, sector_t sector, int dev) |
1da177e4 LT |
632 | { |
633 | sector_t offset, chunk, vchunk; | |
f8c9e74f N |
634 | /* Never use conf->prev as this is only called during resync |
635 | * or recovery, so reshape isn't happening | |
636 | */ | |
5cf00fcd | 637 | struct geom *geo = &conf->geo; |
475901af JB |
638 | int far_set_start = (dev / geo->far_set_size) * geo->far_set_size; |
639 | int far_set_size = geo->far_set_size; | |
9a3152ab JB |
640 | int last_far_set_start; |
641 | ||
642 | if (geo->raid_disks % geo->far_set_size) { | |
643 | last_far_set_start = (geo->raid_disks / geo->far_set_size) - 1; | |
644 | last_far_set_start *= geo->far_set_size; | |
645 | ||
646 | if (dev >= last_far_set_start) { | |
647 | far_set_size = geo->far_set_size; | |
648 | far_set_size += (geo->raid_disks % geo->far_set_size); | |
649 | far_set_start = last_far_set_start; | |
650 | } | |
651 | } | |
1da177e4 | 652 | |
5cf00fcd N |
653 | offset = sector & geo->chunk_mask; |
654 | if (geo->far_offset) { | |
c93983bf | 655 | int fc; |
5cf00fcd N |
656 | chunk = sector >> geo->chunk_shift; |
657 | fc = sector_div(chunk, geo->far_copies); | |
658 | dev -= fc * geo->near_copies; | |
475901af JB |
659 | if (dev < far_set_start) |
660 | dev += far_set_size; | |
c93983bf | 661 | } else { |
5cf00fcd N |
662 | while (sector >= geo->stride) { |
663 | sector -= geo->stride; | |
475901af JB |
664 | if (dev < (geo->near_copies + far_set_start)) |
665 | dev += far_set_size - geo->near_copies; | |
c93983bf | 666 | else |
5cf00fcd | 667 | dev -= geo->near_copies; |
c93983bf | 668 | } |
5cf00fcd | 669 | chunk = sector >> geo->chunk_shift; |
c93983bf | 670 | } |
5cf00fcd N |
671 | vchunk = chunk * geo->raid_disks + dev; |
672 | sector_div(vchunk, geo->near_copies); | |
673 | return (vchunk << geo->chunk_shift) + offset; | |
1da177e4 LT |
674 | } |
675 | ||
676 | /** | |
677 | * raid10_mergeable_bvec -- tell bio layer if a two requests can be merged | |
678 | * @q: request queue | |
cc371e66 | 679 | * @bvm: properties of new bio |
1da177e4 LT |
680 | * @biovec: the request that could be merged to it. |
681 | * | |
682 | * Return amount of bytes we can accept at this offset | |
050b6615 N |
683 | * This requires checking for end-of-chunk if near_copies != raid_disks, |
684 | * and for subordinate merge_bvec_fns if merge_check_needed. | |
1da177e4 | 685 | */ |
cc371e66 AK |
686 | static int raid10_mergeable_bvec(struct request_queue *q, |
687 | struct bvec_merge_data *bvm, | |
688 | struct bio_vec *biovec) | |
1da177e4 | 689 | { |
fd01b88c | 690 | struct mddev *mddev = q->queuedata; |
050b6615 | 691 | struct r10conf *conf = mddev->private; |
cc371e66 | 692 | sector_t sector = bvm->bi_sector + get_start_sect(bvm->bi_bdev); |
1da177e4 | 693 | int max; |
3ea7daa5 | 694 | unsigned int chunk_sectors; |
cc371e66 | 695 | unsigned int bio_sectors = bvm->bi_size >> 9; |
5cf00fcd | 696 | struct geom *geo = &conf->geo; |
1da177e4 | 697 | |
3ea7daa5 | 698 | chunk_sectors = (conf->geo.chunk_mask & conf->prev.chunk_mask) + 1; |
f8c9e74f N |
699 | if (conf->reshape_progress != MaxSector && |
700 | ((sector >= conf->reshape_progress) != | |
701 | conf->mddev->reshape_backwards)) | |
702 | geo = &conf->prev; | |
703 | ||
5cf00fcd | 704 | if (geo->near_copies < geo->raid_disks) { |
050b6615 N |
705 | max = (chunk_sectors - ((sector & (chunk_sectors - 1)) |
706 | + bio_sectors)) << 9; | |
707 | if (max < 0) | |
708 | /* bio_add cannot handle a negative return */ | |
709 | max = 0; | |
710 | if (max <= biovec->bv_len && bio_sectors == 0) | |
711 | return biovec->bv_len; | |
712 | } else | |
713 | max = biovec->bv_len; | |
714 | ||
715 | if (mddev->merge_check_needed) { | |
e0ee7785 N |
716 | struct { |
717 | struct r10bio r10_bio; | |
718 | struct r10dev devs[conf->copies]; | |
719 | } on_stack; | |
720 | struct r10bio *r10_bio = &on_stack.r10_bio; | |
050b6615 | 721 | int s; |
f8c9e74f N |
722 | if (conf->reshape_progress != MaxSector) { |
723 | /* Cannot give any guidance during reshape */ | |
724 | if (max <= biovec->bv_len && bio_sectors == 0) | |
725 | return biovec->bv_len; | |
726 | return 0; | |
727 | } | |
e0ee7785 N |
728 | r10_bio->sector = sector; |
729 | raid10_find_phys(conf, r10_bio); | |
050b6615 N |
730 | rcu_read_lock(); |
731 | for (s = 0; s < conf->copies; s++) { | |
e0ee7785 | 732 | int disk = r10_bio->devs[s].devnum; |
050b6615 N |
733 | struct md_rdev *rdev = rcu_dereference( |
734 | conf->mirrors[disk].rdev); | |
735 | if (rdev && !test_bit(Faulty, &rdev->flags)) { | |
736 | struct request_queue *q = | |
737 | bdev_get_queue(rdev->bdev); | |
738 | if (q->merge_bvec_fn) { | |
e0ee7785 | 739 | bvm->bi_sector = r10_bio->devs[s].addr |
050b6615 N |
740 | + rdev->data_offset; |
741 | bvm->bi_bdev = rdev->bdev; | |
742 | max = min(max, q->merge_bvec_fn( | |
743 | q, bvm, biovec)); | |
744 | } | |
745 | } | |
746 | rdev = rcu_dereference(conf->mirrors[disk].replacement); | |
747 | if (rdev && !test_bit(Faulty, &rdev->flags)) { | |
748 | struct request_queue *q = | |
749 | bdev_get_queue(rdev->bdev); | |
750 | if (q->merge_bvec_fn) { | |
e0ee7785 | 751 | bvm->bi_sector = r10_bio->devs[s].addr |
050b6615 N |
752 | + rdev->data_offset; |
753 | bvm->bi_bdev = rdev->bdev; | |
754 | max = min(max, q->merge_bvec_fn( | |
755 | q, bvm, biovec)); | |
756 | } | |
757 | } | |
758 | } | |
759 | rcu_read_unlock(); | |
760 | } | |
761 | return max; | |
1da177e4 LT |
762 | } |
763 | ||
764 | /* | |
765 | * This routine returns the disk from which the requested read should | |
766 | * be done. There is a per-array 'next expected sequential IO' sector | |
767 | * number - if this matches on the next IO then we use the last disk. | |
768 | * There is also a per-disk 'last know head position' sector that is | |
769 | * maintained from IRQ contexts, both the normal and the resync IO | |
770 | * completion handlers update this position correctly. If there is no | |
771 | * perfect sequential match then we pick the disk whose head is closest. | |
772 | * | |
773 | * If there are 2 mirrors in the same 2 devices, performance degrades | |
774 | * because position is mirror, not device based. | |
775 | * | |
776 | * The rdev for the device selected will have nr_pending incremented. | |
777 | */ | |
778 | ||
779 | /* | |
780 | * FIXME: possibly should rethink readbalancing and do it differently | |
781 | * depending on near_copies / far_copies geometry. | |
782 | */ | |
96c3fd1f N |
783 | static struct md_rdev *read_balance(struct r10conf *conf, |
784 | struct r10bio *r10_bio, | |
785 | int *max_sectors) | |
1da177e4 | 786 | { |
af3a2cd6 | 787 | const sector_t this_sector = r10_bio->sector; |
56d99121 | 788 | int disk, slot; |
856e08e2 N |
789 | int sectors = r10_bio->sectors; |
790 | int best_good_sectors; | |
56d99121 | 791 | sector_t new_distance, best_dist; |
3bbae04b | 792 | struct md_rdev *best_rdev, *rdev = NULL; |
56d99121 N |
793 | int do_balance; |
794 | int best_slot; | |
5cf00fcd | 795 | struct geom *geo = &conf->geo; |
1da177e4 LT |
796 | |
797 | raid10_find_phys(conf, r10_bio); | |
798 | rcu_read_lock(); | |
56d99121 | 799 | retry: |
856e08e2 | 800 | sectors = r10_bio->sectors; |
56d99121 | 801 | best_slot = -1; |
abbf098e | 802 | best_rdev = NULL; |
56d99121 | 803 | best_dist = MaxSector; |
856e08e2 | 804 | best_good_sectors = 0; |
56d99121 | 805 | do_balance = 1; |
1da177e4 LT |
806 | /* |
807 | * Check if we can balance. We can balance on the whole | |
6cce3b23 N |
808 | * device if no resync is going on (recovery is ok), or below |
809 | * the resync window. We take the first readable disk when | |
810 | * above the resync window. | |
1da177e4 LT |
811 | */ |
812 | if (conf->mddev->recovery_cp < MaxSector | |
56d99121 N |
813 | && (this_sector + sectors >= conf->next_resync)) |
814 | do_balance = 0; | |
1da177e4 | 815 | |
56d99121 | 816 | for (slot = 0; slot < conf->copies ; slot++) { |
856e08e2 N |
817 | sector_t first_bad; |
818 | int bad_sectors; | |
819 | sector_t dev_sector; | |
820 | ||
56d99121 N |
821 | if (r10_bio->devs[slot].bio == IO_BLOCKED) |
822 | continue; | |
1da177e4 | 823 | disk = r10_bio->devs[slot].devnum; |
abbf098e N |
824 | rdev = rcu_dereference(conf->mirrors[disk].replacement); |
825 | if (rdev == NULL || test_bit(Faulty, &rdev->flags) || | |
050b6615 | 826 | test_bit(Unmerged, &rdev->flags) || |
abbf098e N |
827 | r10_bio->devs[slot].addr + sectors > rdev->recovery_offset) |
828 | rdev = rcu_dereference(conf->mirrors[disk].rdev); | |
050b6615 N |
829 | if (rdev == NULL || |
830 | test_bit(Faulty, &rdev->flags) || | |
831 | test_bit(Unmerged, &rdev->flags)) | |
abbf098e N |
832 | continue; |
833 | if (!test_bit(In_sync, &rdev->flags) && | |
834 | r10_bio->devs[slot].addr + sectors > rdev->recovery_offset) | |
56d99121 N |
835 | continue; |
836 | ||
856e08e2 N |
837 | dev_sector = r10_bio->devs[slot].addr; |
838 | if (is_badblock(rdev, dev_sector, sectors, | |
839 | &first_bad, &bad_sectors)) { | |
840 | if (best_dist < MaxSector) | |
841 | /* Already have a better slot */ | |
842 | continue; | |
843 | if (first_bad <= dev_sector) { | |
844 | /* Cannot read here. If this is the | |
845 | * 'primary' device, then we must not read | |
846 | * beyond 'bad_sectors' from another device. | |
847 | */ | |
848 | bad_sectors -= (dev_sector - first_bad); | |
849 | if (!do_balance && sectors > bad_sectors) | |
850 | sectors = bad_sectors; | |
851 | if (best_good_sectors > sectors) | |
852 | best_good_sectors = sectors; | |
853 | } else { | |
854 | sector_t good_sectors = | |
855 | first_bad - dev_sector; | |
856 | if (good_sectors > best_good_sectors) { | |
857 | best_good_sectors = good_sectors; | |
858 | best_slot = slot; | |
abbf098e | 859 | best_rdev = rdev; |
856e08e2 N |
860 | } |
861 | if (!do_balance) | |
862 | /* Must read from here */ | |
863 | break; | |
864 | } | |
865 | continue; | |
866 | } else | |
867 | best_good_sectors = sectors; | |
868 | ||
56d99121 N |
869 | if (!do_balance) |
870 | break; | |
1da177e4 | 871 | |
22dfdf52 N |
872 | /* This optimisation is debatable, and completely destroys |
873 | * sequential read speed for 'far copies' arrays. So only | |
874 | * keep it for 'near' arrays, and review those later. | |
875 | */ | |
5cf00fcd | 876 | if (geo->near_copies > 1 && !atomic_read(&rdev->nr_pending)) |
1da177e4 | 877 | break; |
8ed3a195 KS |
878 | |
879 | /* for far > 1 always use the lowest address */ | |
5cf00fcd | 880 | if (geo->far_copies > 1) |
56d99121 | 881 | new_distance = r10_bio->devs[slot].addr; |
8ed3a195 | 882 | else |
56d99121 N |
883 | new_distance = abs(r10_bio->devs[slot].addr - |
884 | conf->mirrors[disk].head_position); | |
885 | if (new_distance < best_dist) { | |
886 | best_dist = new_distance; | |
887 | best_slot = slot; | |
abbf098e | 888 | best_rdev = rdev; |
1da177e4 LT |
889 | } |
890 | } | |
abbf098e | 891 | if (slot >= conf->copies) { |
56d99121 | 892 | slot = best_slot; |
abbf098e N |
893 | rdev = best_rdev; |
894 | } | |
1da177e4 | 895 | |
56d99121 | 896 | if (slot >= 0) { |
56d99121 N |
897 | atomic_inc(&rdev->nr_pending); |
898 | if (test_bit(Faulty, &rdev->flags)) { | |
899 | /* Cannot risk returning a device that failed | |
900 | * before we inc'ed nr_pending | |
901 | */ | |
902 | rdev_dec_pending(rdev, conf->mddev); | |
903 | goto retry; | |
904 | } | |
905 | r10_bio->read_slot = slot; | |
906 | } else | |
96c3fd1f | 907 | rdev = NULL; |
1da177e4 | 908 | rcu_read_unlock(); |
856e08e2 | 909 | *max_sectors = best_good_sectors; |
1da177e4 | 910 | |
96c3fd1f | 911 | return rdev; |
1da177e4 LT |
912 | } |
913 | ||
cc4d1efd | 914 | int md_raid10_congested(struct mddev *mddev, int bits) |
0d129228 | 915 | { |
e879a879 | 916 | struct r10conf *conf = mddev->private; |
0d129228 N |
917 | int i, ret = 0; |
918 | ||
34db0cd6 N |
919 | if ((bits & (1 << BDI_async_congested)) && |
920 | conf->pending_count >= max_queued_requests) | |
921 | return 1; | |
922 | ||
0d129228 | 923 | rcu_read_lock(); |
f8c9e74f N |
924 | for (i = 0; |
925 | (i < conf->geo.raid_disks || i < conf->prev.raid_disks) | |
926 | && ret == 0; | |
927 | i++) { | |
3cb03002 | 928 | struct md_rdev *rdev = rcu_dereference(conf->mirrors[i].rdev); |
0d129228 | 929 | if (rdev && !test_bit(Faulty, &rdev->flags)) { |
165125e1 | 930 | struct request_queue *q = bdev_get_queue(rdev->bdev); |
0d129228 N |
931 | |
932 | ret |= bdi_congested(&q->backing_dev_info, bits); | |
933 | } | |
934 | } | |
935 | rcu_read_unlock(); | |
936 | return ret; | |
937 | } | |
cc4d1efd JB |
938 | EXPORT_SYMBOL_GPL(md_raid10_congested); |
939 | ||
940 | static int raid10_congested(void *data, int bits) | |
941 | { | |
942 | struct mddev *mddev = data; | |
943 | ||
944 | return mddev_congested(mddev, bits) || | |
945 | md_raid10_congested(mddev, bits); | |
946 | } | |
0d129228 | 947 | |
e879a879 | 948 | static void flush_pending_writes(struct r10conf *conf) |
a35e63ef N |
949 | { |
950 | /* Any writes that have been queued but are awaiting | |
951 | * bitmap updates get flushed here. | |
a35e63ef | 952 | */ |
a35e63ef N |
953 | spin_lock_irq(&conf->device_lock); |
954 | ||
955 | if (conf->pending_bio_list.head) { | |
956 | struct bio *bio; | |
957 | bio = bio_list_get(&conf->pending_bio_list); | |
34db0cd6 | 958 | conf->pending_count = 0; |
a35e63ef N |
959 | spin_unlock_irq(&conf->device_lock); |
960 | /* flush any pending bitmap writes to disk | |
961 | * before proceeding w/ I/O */ | |
962 | bitmap_unplug(conf->mddev->bitmap); | |
34db0cd6 | 963 | wake_up(&conf->wait_barrier); |
a35e63ef N |
964 | |
965 | while (bio) { /* submit pending writes */ | |
966 | struct bio *next = bio->bi_next; | |
967 | bio->bi_next = NULL; | |
532a2a3f SL |
968 | if (unlikely((bio->bi_rw & REQ_DISCARD) && |
969 | !blk_queue_discard(bdev_get_queue(bio->bi_bdev)))) | |
970 | /* Just ignore it */ | |
971 | bio_endio(bio, 0); | |
972 | else | |
973 | generic_make_request(bio); | |
a35e63ef N |
974 | bio = next; |
975 | } | |
a35e63ef N |
976 | } else |
977 | spin_unlock_irq(&conf->device_lock); | |
a35e63ef | 978 | } |
7eaceacc | 979 | |
0a27ec96 N |
980 | /* Barriers.... |
981 | * Sometimes we need to suspend IO while we do something else, | |
982 | * either some resync/recovery, or reconfigure the array. | |
983 | * To do this we raise a 'barrier'. | |
984 | * The 'barrier' is a counter that can be raised multiple times | |
985 | * to count how many activities are happening which preclude | |
986 | * normal IO. | |
987 | * We can only raise the barrier if there is no pending IO. | |
988 | * i.e. if nr_pending == 0. | |
989 | * We choose only to raise the barrier if no-one is waiting for the | |
990 | * barrier to go down. This means that as soon as an IO request | |
991 | * is ready, no other operations which require a barrier will start | |
992 | * until the IO request has had a chance. | |
993 | * | |
994 | * So: regular IO calls 'wait_barrier'. When that returns there | |
995 | * is no backgroup IO happening, It must arrange to call | |
996 | * allow_barrier when it has finished its IO. | |
997 | * backgroup IO calls must call raise_barrier. Once that returns | |
998 | * there is no normal IO happeing. It must arrange to call | |
999 | * lower_barrier when the particular background IO completes. | |
1da177e4 | 1000 | */ |
1da177e4 | 1001 | |
e879a879 | 1002 | static void raise_barrier(struct r10conf *conf, int force) |
1da177e4 | 1003 | { |
6cce3b23 | 1004 | BUG_ON(force && !conf->barrier); |
1da177e4 | 1005 | spin_lock_irq(&conf->resync_lock); |
0a27ec96 | 1006 | |
6cce3b23 N |
1007 | /* Wait until no block IO is waiting (unless 'force') */ |
1008 | wait_event_lock_irq(conf->wait_barrier, force || !conf->nr_waiting, | |
eed8c02e | 1009 | conf->resync_lock); |
0a27ec96 N |
1010 | |
1011 | /* block any new IO from starting */ | |
1012 | conf->barrier++; | |
1013 | ||
c3b328ac | 1014 | /* Now wait for all pending IO to complete */ |
0a27ec96 N |
1015 | wait_event_lock_irq(conf->wait_barrier, |
1016 | !conf->nr_pending && conf->barrier < RESYNC_DEPTH, | |
eed8c02e | 1017 | conf->resync_lock); |
0a27ec96 N |
1018 | |
1019 | spin_unlock_irq(&conf->resync_lock); | |
1020 | } | |
1021 | ||
e879a879 | 1022 | static void lower_barrier(struct r10conf *conf) |
0a27ec96 N |
1023 | { |
1024 | unsigned long flags; | |
1025 | spin_lock_irqsave(&conf->resync_lock, flags); | |
1026 | conf->barrier--; | |
1027 | spin_unlock_irqrestore(&conf->resync_lock, flags); | |
1028 | wake_up(&conf->wait_barrier); | |
1029 | } | |
1030 | ||
e879a879 | 1031 | static void wait_barrier(struct r10conf *conf) |
0a27ec96 N |
1032 | { |
1033 | spin_lock_irq(&conf->resync_lock); | |
1034 | if (conf->barrier) { | |
1035 | conf->nr_waiting++; | |
d6b42dcb N |
1036 | /* Wait for the barrier to drop. |
1037 | * However if there are already pending | |
1038 | * requests (preventing the barrier from | |
1039 | * rising completely), and the | |
1040 | * pre-process bio queue isn't empty, | |
1041 | * then don't wait, as we need to empty | |
1042 | * that queue to get the nr_pending | |
1043 | * count down. | |
1044 | */ | |
1045 | wait_event_lock_irq(conf->wait_barrier, | |
1046 | !conf->barrier || | |
1047 | (conf->nr_pending && | |
1048 | current->bio_list && | |
1049 | !bio_list_empty(current->bio_list)), | |
eed8c02e | 1050 | conf->resync_lock); |
0a27ec96 | 1051 | conf->nr_waiting--; |
1da177e4 | 1052 | } |
0a27ec96 | 1053 | conf->nr_pending++; |
1da177e4 LT |
1054 | spin_unlock_irq(&conf->resync_lock); |
1055 | } | |
1056 | ||
e879a879 | 1057 | static void allow_barrier(struct r10conf *conf) |
0a27ec96 N |
1058 | { |
1059 | unsigned long flags; | |
1060 | spin_lock_irqsave(&conf->resync_lock, flags); | |
1061 | conf->nr_pending--; | |
1062 | spin_unlock_irqrestore(&conf->resync_lock, flags); | |
1063 | wake_up(&conf->wait_barrier); | |
1064 | } | |
1065 | ||
e2d59925 | 1066 | static void freeze_array(struct r10conf *conf, int extra) |
4443ae10 N |
1067 | { |
1068 | /* stop syncio and normal IO and wait for everything to | |
f188593e | 1069 | * go quiet. |
4443ae10 | 1070 | * We increment barrier and nr_waiting, and then |
e2d59925 | 1071 | * wait until nr_pending match nr_queued+extra |
1c830532 N |
1072 | * This is called in the context of one normal IO request |
1073 | * that has failed. Thus any sync request that might be pending | |
1074 | * will be blocked by nr_pending, and we need to wait for | |
1075 | * pending IO requests to complete or be queued for re-try. | |
e2d59925 | 1076 | * Thus the number queued (nr_queued) plus this request (extra) |
1c830532 N |
1077 | * must match the number of pending IOs (nr_pending) before |
1078 | * we continue. | |
4443ae10 N |
1079 | */ |
1080 | spin_lock_irq(&conf->resync_lock); | |
1081 | conf->barrier++; | |
1082 | conf->nr_waiting++; | |
eed8c02e | 1083 | wait_event_lock_irq_cmd(conf->wait_barrier, |
e2d59925 | 1084 | conf->nr_pending == conf->nr_queued+extra, |
eed8c02e LC |
1085 | conf->resync_lock, |
1086 | flush_pending_writes(conf)); | |
c3b328ac | 1087 | |
4443ae10 N |
1088 | spin_unlock_irq(&conf->resync_lock); |
1089 | } | |
1090 | ||
e879a879 | 1091 | static void unfreeze_array(struct r10conf *conf) |
4443ae10 N |
1092 | { |
1093 | /* reverse the effect of the freeze */ | |
1094 | spin_lock_irq(&conf->resync_lock); | |
1095 | conf->barrier--; | |
1096 | conf->nr_waiting--; | |
1097 | wake_up(&conf->wait_barrier); | |
1098 | spin_unlock_irq(&conf->resync_lock); | |
1099 | } | |
1100 | ||
f8c9e74f N |
1101 | static sector_t choose_data_offset(struct r10bio *r10_bio, |
1102 | struct md_rdev *rdev) | |
1103 | { | |
1104 | if (!test_bit(MD_RECOVERY_RESHAPE, &rdev->mddev->recovery) || | |
1105 | test_bit(R10BIO_Previous, &r10_bio->state)) | |
1106 | return rdev->data_offset; | |
1107 | else | |
1108 | return rdev->new_data_offset; | |
1109 | } | |
1110 | ||
57c67df4 N |
1111 | struct raid10_plug_cb { |
1112 | struct blk_plug_cb cb; | |
1113 | struct bio_list pending; | |
1114 | int pending_cnt; | |
1115 | }; | |
1116 | ||
1117 | static void raid10_unplug(struct blk_plug_cb *cb, bool from_schedule) | |
1118 | { | |
1119 | struct raid10_plug_cb *plug = container_of(cb, struct raid10_plug_cb, | |
1120 | cb); | |
1121 | struct mddev *mddev = plug->cb.data; | |
1122 | struct r10conf *conf = mddev->private; | |
1123 | struct bio *bio; | |
1124 | ||
874807a8 | 1125 | if (from_schedule || current->bio_list) { |
57c67df4 N |
1126 | spin_lock_irq(&conf->device_lock); |
1127 | bio_list_merge(&conf->pending_bio_list, &plug->pending); | |
1128 | conf->pending_count += plug->pending_cnt; | |
1129 | spin_unlock_irq(&conf->device_lock); | |
ee0b0244 | 1130 | wake_up(&conf->wait_barrier); |
57c67df4 N |
1131 | md_wakeup_thread(mddev->thread); |
1132 | kfree(plug); | |
1133 | return; | |
1134 | } | |
1135 | ||
1136 | /* we aren't scheduling, so we can do the write-out directly. */ | |
1137 | bio = bio_list_get(&plug->pending); | |
1138 | bitmap_unplug(mddev->bitmap); | |
1139 | wake_up(&conf->wait_barrier); | |
1140 | ||
1141 | while (bio) { /* submit pending writes */ | |
1142 | struct bio *next = bio->bi_next; | |
1143 | bio->bi_next = NULL; | |
32f9f570 SL |
1144 | if (unlikely((bio->bi_rw & REQ_DISCARD) && |
1145 | !blk_queue_discard(bdev_get_queue(bio->bi_bdev)))) | |
1146 | /* Just ignore it */ | |
1147 | bio_endio(bio, 0); | |
1148 | else | |
1149 | generic_make_request(bio); | |
57c67df4 N |
1150 | bio = next; |
1151 | } | |
1152 | kfree(plug); | |
1153 | } | |
1154 | ||
b4fdcb02 | 1155 | static void make_request(struct mddev *mddev, struct bio * bio) |
1da177e4 | 1156 | { |
e879a879 | 1157 | struct r10conf *conf = mddev->private; |
9f2c9d12 | 1158 | struct r10bio *r10_bio; |
1da177e4 LT |
1159 | struct bio *read_bio; |
1160 | int i; | |
f8c9e74f | 1161 | sector_t chunk_mask = (conf->geo.chunk_mask & conf->prev.chunk_mask); |
5cf00fcd | 1162 | int chunk_sects = chunk_mask + 1; |
a362357b | 1163 | const int rw = bio_data_dir(bio); |
2c7d46ec | 1164 | const unsigned long do_sync = (bio->bi_rw & REQ_SYNC); |
e9c7469b | 1165 | const unsigned long do_fua = (bio->bi_rw & REQ_FUA); |
532a2a3f SL |
1166 | const unsigned long do_discard = (bio->bi_rw |
1167 | & (REQ_DISCARD | REQ_SECURE)); | |
c8dc9c65 | 1168 | const unsigned long do_same = (bio->bi_rw & REQ_WRITE_SAME); |
6cce3b23 | 1169 | unsigned long flags; |
3cb03002 | 1170 | struct md_rdev *blocked_rdev; |
57c67df4 N |
1171 | struct blk_plug_cb *cb; |
1172 | struct raid10_plug_cb *plug = NULL; | |
d4432c23 N |
1173 | int sectors_handled; |
1174 | int max_sectors; | |
3ea7daa5 | 1175 | int sectors; |
1da177e4 | 1176 | |
e9c7469b TH |
1177 | if (unlikely(bio->bi_rw & REQ_FLUSH)) { |
1178 | md_flush_request(mddev, bio); | |
5a7bbad2 | 1179 | return; |
e5dcdd80 N |
1180 | } |
1181 | ||
1da177e4 LT |
1182 | /* If this request crosses a chunk boundary, we need to |
1183 | * split it. This will only happen for 1 PAGE (or less) requests. | |
1184 | */ | |
aa8b57aa | 1185 | if (unlikely((bio->bi_sector & chunk_mask) + bio_sectors(bio) |
5cf00fcd | 1186 | > chunk_sects |
f8c9e74f N |
1187 | && (conf->geo.near_copies < conf->geo.raid_disks |
1188 | || conf->prev.near_copies < conf->prev.raid_disks))) { | |
1da177e4 LT |
1189 | struct bio_pair *bp; |
1190 | /* Sanity check -- queue functions should prevent this happening */ | |
5b83636a | 1191 | if (bio_segments(bio) > 1) |
1da177e4 LT |
1192 | goto bad_map; |
1193 | /* This is a one page bio that upper layers | |
1194 | * refuse to split for us, so we need to split it. | |
1195 | */ | |
6feef531 | 1196 | bp = bio_split(bio, |
1da177e4 | 1197 | chunk_sects - (bio->bi_sector & (chunk_sects - 1)) ); |
51e9ac77 N |
1198 | |
1199 | /* Each of these 'make_request' calls will call 'wait_barrier'. | |
1200 | * If the first succeeds but the second blocks due to the resync | |
1201 | * thread raising the barrier, we will deadlock because the | |
1202 | * IO to the underlying device will be queued in generic_make_request | |
1203 | * and will never complete, so will never reduce nr_pending. | |
1204 | * So increment nr_waiting here so no new raise_barriers will | |
1205 | * succeed, and so the second wait_barrier cannot block. | |
1206 | */ | |
1207 | spin_lock_irq(&conf->resync_lock); | |
1208 | conf->nr_waiting++; | |
1209 | spin_unlock_irq(&conf->resync_lock); | |
1210 | ||
5a7bbad2 CH |
1211 | make_request(mddev, &bp->bio1); |
1212 | make_request(mddev, &bp->bio2); | |
1da177e4 | 1213 | |
51e9ac77 N |
1214 | spin_lock_irq(&conf->resync_lock); |
1215 | conf->nr_waiting--; | |
1216 | wake_up(&conf->wait_barrier); | |
1217 | spin_unlock_irq(&conf->resync_lock); | |
1218 | ||
1da177e4 | 1219 | bio_pair_release(bp); |
5a7bbad2 | 1220 | return; |
1da177e4 | 1221 | bad_map: |
128595ed N |
1222 | printk("md/raid10:%s: make_request bug: can't convert block across chunks" |
1223 | " or bigger than %dk %llu %d\n", mdname(mddev), chunk_sects/2, | |
aa8b57aa | 1224 | (unsigned long long)bio->bi_sector, bio_sectors(bio) / 2); |
1da177e4 | 1225 | |
6712ecf8 | 1226 | bio_io_error(bio); |
5a7bbad2 | 1227 | return; |
1da177e4 LT |
1228 | } |
1229 | ||
3d310eb7 | 1230 | md_write_start(mddev, bio); |
06d91a5f | 1231 | |
1da177e4 LT |
1232 | /* |
1233 | * Register the new request and wait if the reconstruction | |
1234 | * thread has put up a bar for new requests. | |
1235 | * Continue immediately if no resync is active currently. | |
1236 | */ | |
0a27ec96 | 1237 | wait_barrier(conf); |
1da177e4 | 1238 | |
aa8b57aa | 1239 | sectors = bio_sectors(bio); |
3ea7daa5 N |
1240 | while (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) && |
1241 | bio->bi_sector < conf->reshape_progress && | |
1242 | bio->bi_sector + sectors > conf->reshape_progress) { | |
1243 | /* IO spans the reshape position. Need to wait for | |
1244 | * reshape to pass | |
1245 | */ | |
1246 | allow_barrier(conf); | |
1247 | wait_event(conf->wait_barrier, | |
1248 | conf->reshape_progress <= bio->bi_sector || | |
1249 | conf->reshape_progress >= bio->bi_sector + sectors); | |
1250 | wait_barrier(conf); | |
1251 | } | |
1252 | if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) && | |
1253 | bio_data_dir(bio) == WRITE && | |
1254 | (mddev->reshape_backwards | |
1255 | ? (bio->bi_sector < conf->reshape_safe && | |
1256 | bio->bi_sector + sectors > conf->reshape_progress) | |
1257 | : (bio->bi_sector + sectors > conf->reshape_safe && | |
1258 | bio->bi_sector < conf->reshape_progress))) { | |
1259 | /* Need to update reshape_position in metadata */ | |
1260 | mddev->reshape_position = conf->reshape_progress; | |
1261 | set_bit(MD_CHANGE_DEVS, &mddev->flags); | |
1262 | set_bit(MD_CHANGE_PENDING, &mddev->flags); | |
1263 | md_wakeup_thread(mddev->thread); | |
1264 | wait_event(mddev->sb_wait, | |
1265 | !test_bit(MD_CHANGE_PENDING, &mddev->flags)); | |
1266 | ||
1267 | conf->reshape_safe = mddev->reshape_position; | |
1268 | } | |
1269 | ||
1da177e4 LT |
1270 | r10_bio = mempool_alloc(conf->r10bio_pool, GFP_NOIO); |
1271 | ||
1272 | r10_bio->master_bio = bio; | |
3ea7daa5 | 1273 | r10_bio->sectors = sectors; |
1da177e4 LT |
1274 | |
1275 | r10_bio->mddev = mddev; | |
1276 | r10_bio->sector = bio->bi_sector; | |
6cce3b23 | 1277 | r10_bio->state = 0; |
1da177e4 | 1278 | |
856e08e2 N |
1279 | /* We might need to issue multiple reads to different |
1280 | * devices if there are bad blocks around, so we keep | |
1281 | * track of the number of reads in bio->bi_phys_segments. | |
1282 | * If this is 0, there is only one r10_bio and no locking | |
1283 | * will be needed when the request completes. If it is | |
1284 | * non-zero, then it is the number of not-completed requests. | |
1285 | */ | |
1286 | bio->bi_phys_segments = 0; | |
1287 | clear_bit(BIO_SEG_VALID, &bio->bi_flags); | |
1288 | ||
a362357b | 1289 | if (rw == READ) { |
1da177e4 LT |
1290 | /* |
1291 | * read balancing logic: | |
1292 | */ | |
96c3fd1f | 1293 | struct md_rdev *rdev; |
856e08e2 N |
1294 | int slot; |
1295 | ||
1296 | read_again: | |
96c3fd1f N |
1297 | rdev = read_balance(conf, r10_bio, &max_sectors); |
1298 | if (!rdev) { | |
1da177e4 | 1299 | raid_end_bio_io(r10_bio); |
5a7bbad2 | 1300 | return; |
1da177e4 | 1301 | } |
96c3fd1f | 1302 | slot = r10_bio->read_slot; |
1da177e4 | 1303 | |
a167f663 | 1304 | read_bio = bio_clone_mddev(bio, GFP_NOIO, mddev); |
6678d83f KO |
1305 | bio_trim(read_bio, r10_bio->sector - bio->bi_sector, |
1306 | max_sectors); | |
1da177e4 LT |
1307 | |
1308 | r10_bio->devs[slot].bio = read_bio; | |
abbf098e | 1309 | r10_bio->devs[slot].rdev = rdev; |
1da177e4 LT |
1310 | |
1311 | read_bio->bi_sector = r10_bio->devs[slot].addr + | |
f8c9e74f | 1312 | choose_data_offset(r10_bio, rdev); |
96c3fd1f | 1313 | read_bio->bi_bdev = rdev->bdev; |
1da177e4 | 1314 | read_bio->bi_end_io = raid10_end_read_request; |
7b6d91da | 1315 | read_bio->bi_rw = READ | do_sync; |
1da177e4 LT |
1316 | read_bio->bi_private = r10_bio; |
1317 | ||
856e08e2 N |
1318 | if (max_sectors < r10_bio->sectors) { |
1319 | /* Could not read all from this device, so we will | |
1320 | * need another r10_bio. | |
1321 | */ | |
b50c259e | 1322 | sectors_handled = (r10_bio->sector + max_sectors |
856e08e2 N |
1323 | - bio->bi_sector); |
1324 | r10_bio->sectors = max_sectors; | |
1325 | spin_lock_irq(&conf->device_lock); | |
1326 | if (bio->bi_phys_segments == 0) | |
1327 | bio->bi_phys_segments = 2; | |
1328 | else | |
1329 | bio->bi_phys_segments++; | |
b50c259e | 1330 | spin_unlock_irq(&conf->device_lock); |
856e08e2 N |
1331 | /* Cannot call generic_make_request directly |
1332 | * as that will be queued in __generic_make_request | |
1333 | * and subsequent mempool_alloc might block | |
1334 | * waiting for it. so hand bio over to raid10d. | |
1335 | */ | |
1336 | reschedule_retry(r10_bio); | |
1337 | ||
1338 | r10_bio = mempool_alloc(conf->r10bio_pool, GFP_NOIO); | |
1339 | ||
1340 | r10_bio->master_bio = bio; | |
aa8b57aa | 1341 | r10_bio->sectors = bio_sectors(bio) - sectors_handled; |
856e08e2 N |
1342 | r10_bio->state = 0; |
1343 | r10_bio->mddev = mddev; | |
1344 | r10_bio->sector = bio->bi_sector + sectors_handled; | |
1345 | goto read_again; | |
1346 | } else | |
1347 | generic_make_request(read_bio); | |
5a7bbad2 | 1348 | return; |
1da177e4 LT |
1349 | } |
1350 | ||
1351 | /* | |
1352 | * WRITE: | |
1353 | */ | |
34db0cd6 N |
1354 | if (conf->pending_count >= max_queued_requests) { |
1355 | md_wakeup_thread(mddev->thread); | |
1356 | wait_event(conf->wait_barrier, | |
1357 | conf->pending_count < max_queued_requests); | |
1358 | } | |
6bfe0b49 | 1359 | /* first select target devices under rcu_lock and |
1da177e4 LT |
1360 | * inc refcount on their rdev. Record them by setting |
1361 | * bios[x] to bio | |
d4432c23 N |
1362 | * If there are known/acknowledged bad blocks on any device |
1363 | * on which we have seen a write error, we want to avoid | |
1364 | * writing to those blocks. This potentially requires several | |
1365 | * writes to write around the bad blocks. Each set of writes | |
1366 | * gets its own r10_bio with a set of bios attached. The number | |
1367 | * of r10_bios is recored in bio->bi_phys_segments just as with | |
1368 | * the read case. | |
1da177e4 | 1369 | */ |
c3b328ac | 1370 | |
69335ef3 | 1371 | r10_bio->read_slot = -1; /* make sure repl_bio gets freed */ |
1da177e4 | 1372 | raid10_find_phys(conf, r10_bio); |
d4432c23 | 1373 | retry_write: |
cb6969e8 | 1374 | blocked_rdev = NULL; |
1da177e4 | 1375 | rcu_read_lock(); |
d4432c23 N |
1376 | max_sectors = r10_bio->sectors; |
1377 | ||
1da177e4 LT |
1378 | for (i = 0; i < conf->copies; i++) { |
1379 | int d = r10_bio->devs[i].devnum; | |
3cb03002 | 1380 | struct md_rdev *rdev = rcu_dereference(conf->mirrors[d].rdev); |
475b0321 N |
1381 | struct md_rdev *rrdev = rcu_dereference( |
1382 | conf->mirrors[d].replacement); | |
4ca40c2c N |
1383 | if (rdev == rrdev) |
1384 | rrdev = NULL; | |
6bfe0b49 DW |
1385 | if (rdev && unlikely(test_bit(Blocked, &rdev->flags))) { |
1386 | atomic_inc(&rdev->nr_pending); | |
1387 | blocked_rdev = rdev; | |
1388 | break; | |
1389 | } | |
475b0321 N |
1390 | if (rrdev && unlikely(test_bit(Blocked, &rrdev->flags))) { |
1391 | atomic_inc(&rrdev->nr_pending); | |
1392 | blocked_rdev = rrdev; | |
1393 | break; | |
1394 | } | |
e7c0c3fa N |
1395 | if (rdev && (test_bit(Faulty, &rdev->flags) |
1396 | || test_bit(Unmerged, &rdev->flags))) | |
1397 | rdev = NULL; | |
050b6615 N |
1398 | if (rrdev && (test_bit(Faulty, &rrdev->flags) |
1399 | || test_bit(Unmerged, &rrdev->flags))) | |
475b0321 N |
1400 | rrdev = NULL; |
1401 | ||
d4432c23 | 1402 | r10_bio->devs[i].bio = NULL; |
475b0321 | 1403 | r10_bio->devs[i].repl_bio = NULL; |
e7c0c3fa N |
1404 | |
1405 | if (!rdev && !rrdev) { | |
6cce3b23 | 1406 | set_bit(R10BIO_Degraded, &r10_bio->state); |
d4432c23 N |
1407 | continue; |
1408 | } | |
e7c0c3fa | 1409 | if (rdev && test_bit(WriteErrorSeen, &rdev->flags)) { |
d4432c23 N |
1410 | sector_t first_bad; |
1411 | sector_t dev_sector = r10_bio->devs[i].addr; | |
1412 | int bad_sectors; | |
1413 | int is_bad; | |
1414 | ||
1415 | is_bad = is_badblock(rdev, dev_sector, | |
1416 | max_sectors, | |
1417 | &first_bad, &bad_sectors); | |
1418 | if (is_bad < 0) { | |
1419 | /* Mustn't write here until the bad block | |
1420 | * is acknowledged | |
1421 | */ | |
1422 | atomic_inc(&rdev->nr_pending); | |
1423 | set_bit(BlockedBadBlocks, &rdev->flags); | |
1424 | blocked_rdev = rdev; | |
1425 | break; | |
1426 | } | |
1427 | if (is_bad && first_bad <= dev_sector) { | |
1428 | /* Cannot write here at all */ | |
1429 | bad_sectors -= (dev_sector - first_bad); | |
1430 | if (bad_sectors < max_sectors) | |
1431 | /* Mustn't write more than bad_sectors | |
1432 | * to other devices yet | |
1433 | */ | |
1434 | max_sectors = bad_sectors; | |
1435 | /* We don't set R10BIO_Degraded as that | |
1436 | * only applies if the disk is missing, | |
1437 | * so it might be re-added, and we want to | |
1438 | * know to recover this chunk. | |
1439 | * In this case the device is here, and the | |
1440 | * fact that this chunk is not in-sync is | |
1441 | * recorded in the bad block log. | |
1442 | */ | |
1443 | continue; | |
1444 | } | |
1445 | if (is_bad) { | |
1446 | int good_sectors = first_bad - dev_sector; | |
1447 | if (good_sectors < max_sectors) | |
1448 | max_sectors = good_sectors; | |
1449 | } | |
6cce3b23 | 1450 | } |
e7c0c3fa N |
1451 | if (rdev) { |
1452 | r10_bio->devs[i].bio = bio; | |
1453 | atomic_inc(&rdev->nr_pending); | |
1454 | } | |
475b0321 N |
1455 | if (rrdev) { |
1456 | r10_bio->devs[i].repl_bio = bio; | |
1457 | atomic_inc(&rrdev->nr_pending); | |
1458 | } | |
1da177e4 LT |
1459 | } |
1460 | rcu_read_unlock(); | |
1461 | ||
6bfe0b49 DW |
1462 | if (unlikely(blocked_rdev)) { |
1463 | /* Have to wait for this device to get unblocked, then retry */ | |
1464 | int j; | |
1465 | int d; | |
1466 | ||
475b0321 | 1467 | for (j = 0; j < i; j++) { |
6bfe0b49 DW |
1468 | if (r10_bio->devs[j].bio) { |
1469 | d = r10_bio->devs[j].devnum; | |
1470 | rdev_dec_pending(conf->mirrors[d].rdev, mddev); | |
1471 | } | |
475b0321 | 1472 | if (r10_bio->devs[j].repl_bio) { |
4ca40c2c | 1473 | struct md_rdev *rdev; |
475b0321 | 1474 | d = r10_bio->devs[j].devnum; |
4ca40c2c N |
1475 | rdev = conf->mirrors[d].replacement; |
1476 | if (!rdev) { | |
1477 | /* Race with remove_disk */ | |
1478 | smp_mb(); | |
1479 | rdev = conf->mirrors[d].rdev; | |
1480 | } | |
1481 | rdev_dec_pending(rdev, mddev); | |
475b0321 N |
1482 | } |
1483 | } | |
6bfe0b49 DW |
1484 | allow_barrier(conf); |
1485 | md_wait_for_blocked_rdev(blocked_rdev, mddev); | |
1486 | wait_barrier(conf); | |
1487 | goto retry_write; | |
1488 | } | |
1489 | ||
d4432c23 N |
1490 | if (max_sectors < r10_bio->sectors) { |
1491 | /* We are splitting this into multiple parts, so | |
1492 | * we need to prepare for allocating another r10_bio. | |
1493 | */ | |
1494 | r10_bio->sectors = max_sectors; | |
1495 | spin_lock_irq(&conf->device_lock); | |
1496 | if (bio->bi_phys_segments == 0) | |
1497 | bio->bi_phys_segments = 2; | |
1498 | else | |
1499 | bio->bi_phys_segments++; | |
1500 | spin_unlock_irq(&conf->device_lock); | |
1501 | } | |
1502 | sectors_handled = r10_bio->sector + max_sectors - bio->bi_sector; | |
1503 | ||
4e78064f | 1504 | atomic_set(&r10_bio->remaining, 1); |
d4432c23 | 1505 | bitmap_startwrite(mddev->bitmap, r10_bio->sector, r10_bio->sectors, 0); |
06d91a5f | 1506 | |
1da177e4 LT |
1507 | for (i = 0; i < conf->copies; i++) { |
1508 | struct bio *mbio; | |
1509 | int d = r10_bio->devs[i].devnum; | |
e7c0c3fa N |
1510 | if (r10_bio->devs[i].bio) { |
1511 | struct md_rdev *rdev = conf->mirrors[d].rdev; | |
1512 | mbio = bio_clone_mddev(bio, GFP_NOIO, mddev); | |
6678d83f KO |
1513 | bio_trim(mbio, r10_bio->sector - bio->bi_sector, |
1514 | max_sectors); | |
e7c0c3fa N |
1515 | r10_bio->devs[i].bio = mbio; |
1516 | ||
1517 | mbio->bi_sector = (r10_bio->devs[i].addr+ | |
1518 | choose_data_offset(r10_bio, | |
1519 | rdev)); | |
1520 | mbio->bi_bdev = rdev->bdev; | |
1521 | mbio->bi_end_io = raid10_end_write_request; | |
c8dc9c65 JL |
1522 | mbio->bi_rw = |
1523 | WRITE | do_sync | do_fua | do_discard | do_same; | |
e7c0c3fa N |
1524 | mbio->bi_private = r10_bio; |
1525 | ||
1526 | atomic_inc(&r10_bio->remaining); | |
1527 | ||
1528 | cb = blk_check_plugged(raid10_unplug, mddev, | |
1529 | sizeof(*plug)); | |
1530 | if (cb) | |
1531 | plug = container_of(cb, struct raid10_plug_cb, | |
1532 | cb); | |
1533 | else | |
1534 | plug = NULL; | |
1535 | spin_lock_irqsave(&conf->device_lock, flags); | |
1536 | if (plug) { | |
1537 | bio_list_add(&plug->pending, mbio); | |
1538 | plug->pending_cnt++; | |
1539 | } else { | |
1540 | bio_list_add(&conf->pending_bio_list, mbio); | |
1541 | conf->pending_count++; | |
1542 | } | |
1543 | spin_unlock_irqrestore(&conf->device_lock, flags); | |
1544 | if (!plug) | |
1545 | md_wakeup_thread(mddev->thread); | |
1546 | } | |
57c67df4 | 1547 | |
e7c0c3fa N |
1548 | if (r10_bio->devs[i].repl_bio) { |
1549 | struct md_rdev *rdev = conf->mirrors[d].replacement; | |
1550 | if (rdev == NULL) { | |
1551 | /* Replacement just got moved to main 'rdev' */ | |
1552 | smp_mb(); | |
1553 | rdev = conf->mirrors[d].rdev; | |
1554 | } | |
1555 | mbio = bio_clone_mddev(bio, GFP_NOIO, mddev); | |
6678d83f KO |
1556 | bio_trim(mbio, r10_bio->sector - bio->bi_sector, |
1557 | max_sectors); | |
e7c0c3fa N |
1558 | r10_bio->devs[i].repl_bio = mbio; |
1559 | ||
1560 | mbio->bi_sector = (r10_bio->devs[i].addr + | |
1561 | choose_data_offset( | |
1562 | r10_bio, rdev)); | |
1563 | mbio->bi_bdev = rdev->bdev; | |
1564 | mbio->bi_end_io = raid10_end_write_request; | |
c8dc9c65 JL |
1565 | mbio->bi_rw = |
1566 | WRITE | do_sync | do_fua | do_discard | do_same; | |
e7c0c3fa N |
1567 | mbio->bi_private = r10_bio; |
1568 | ||
1569 | atomic_inc(&r10_bio->remaining); | |
1570 | spin_lock_irqsave(&conf->device_lock, flags); | |
57c67df4 N |
1571 | bio_list_add(&conf->pending_bio_list, mbio); |
1572 | conf->pending_count++; | |
e7c0c3fa N |
1573 | spin_unlock_irqrestore(&conf->device_lock, flags); |
1574 | if (!mddev_check_plugged(mddev)) | |
1575 | md_wakeup_thread(mddev->thread); | |
57c67df4 | 1576 | } |
1da177e4 LT |
1577 | } |
1578 | ||
079fa166 N |
1579 | /* Don't remove the bias on 'remaining' (one_write_done) until |
1580 | * after checking if we need to go around again. | |
1581 | */ | |
a35e63ef | 1582 | |
aa8b57aa | 1583 | if (sectors_handled < bio_sectors(bio)) { |
079fa166 | 1584 | one_write_done(r10_bio); |
5e570289 | 1585 | /* We need another r10_bio. It has already been counted |
d4432c23 N |
1586 | * in bio->bi_phys_segments. |
1587 | */ | |
1588 | r10_bio = mempool_alloc(conf->r10bio_pool, GFP_NOIO); | |
1589 | ||
1590 | r10_bio->master_bio = bio; | |
aa8b57aa | 1591 | r10_bio->sectors = bio_sectors(bio) - sectors_handled; |
d4432c23 N |
1592 | |
1593 | r10_bio->mddev = mddev; | |
1594 | r10_bio->sector = bio->bi_sector + sectors_handled; | |
1595 | r10_bio->state = 0; | |
1596 | goto retry_write; | |
1597 | } | |
079fa166 N |
1598 | one_write_done(r10_bio); |
1599 | ||
1600 | /* In case raid10d snuck in to freeze_array */ | |
1601 | wake_up(&conf->wait_barrier); | |
1da177e4 LT |
1602 | } |
1603 | ||
fd01b88c | 1604 | static void status(struct seq_file *seq, struct mddev *mddev) |
1da177e4 | 1605 | { |
e879a879 | 1606 | struct r10conf *conf = mddev->private; |
1da177e4 LT |
1607 | int i; |
1608 | ||
5cf00fcd | 1609 | if (conf->geo.near_copies < conf->geo.raid_disks) |
9d8f0363 | 1610 | seq_printf(seq, " %dK chunks", mddev->chunk_sectors / 2); |
5cf00fcd N |
1611 | if (conf->geo.near_copies > 1) |
1612 | seq_printf(seq, " %d near-copies", conf->geo.near_copies); | |
1613 | if (conf->geo.far_copies > 1) { | |
1614 | if (conf->geo.far_offset) | |
1615 | seq_printf(seq, " %d offset-copies", conf->geo.far_copies); | |
c93983bf | 1616 | else |
5cf00fcd | 1617 | seq_printf(seq, " %d far-copies", conf->geo.far_copies); |
c93983bf | 1618 | } |
5cf00fcd N |
1619 | seq_printf(seq, " [%d/%d] [", conf->geo.raid_disks, |
1620 | conf->geo.raid_disks - mddev->degraded); | |
1621 | for (i = 0; i < conf->geo.raid_disks; i++) | |
1da177e4 LT |
1622 | seq_printf(seq, "%s", |
1623 | conf->mirrors[i].rdev && | |
b2d444d7 | 1624 | test_bit(In_sync, &conf->mirrors[i].rdev->flags) ? "U" : "_"); |
1da177e4 LT |
1625 | seq_printf(seq, "]"); |
1626 | } | |
1627 | ||
700c7213 N |
1628 | /* check if there are enough drives for |
1629 | * every block to appear on atleast one. | |
1630 | * Don't consider the device numbered 'ignore' | |
1631 | * as we might be about to remove it. | |
1632 | */ | |
635f6416 | 1633 | static int _enough(struct r10conf *conf, int previous, int ignore) |
700c7213 N |
1634 | { |
1635 | int first = 0; | |
725d6e57 | 1636 | int has_enough = 0; |
635f6416 N |
1637 | int disks, ncopies; |
1638 | if (previous) { | |
1639 | disks = conf->prev.raid_disks; | |
1640 | ncopies = conf->prev.near_copies; | |
1641 | } else { | |
1642 | disks = conf->geo.raid_disks; | |
1643 | ncopies = conf->geo.near_copies; | |
1644 | } | |
700c7213 | 1645 | |
725d6e57 | 1646 | rcu_read_lock(); |
700c7213 N |
1647 | do { |
1648 | int n = conf->copies; | |
1649 | int cnt = 0; | |
80b48124 | 1650 | int this = first; |
700c7213 | 1651 | while (n--) { |
725d6e57 N |
1652 | struct md_rdev *rdev; |
1653 | if (this != ignore && | |
1654 | (rdev = rcu_dereference(conf->mirrors[this].rdev)) && | |
1655 | test_bit(In_sync, &rdev->flags)) | |
700c7213 | 1656 | cnt++; |
635f6416 | 1657 | this = (this+1) % disks; |
700c7213 N |
1658 | } |
1659 | if (cnt == 0) | |
725d6e57 | 1660 | goto out; |
635f6416 | 1661 | first = (first + ncopies) % disks; |
700c7213 | 1662 | } while (first != 0); |
725d6e57 N |
1663 | has_enough = 1; |
1664 | out: | |
1665 | rcu_read_unlock(); | |
1666 | return has_enough; | |
700c7213 N |
1667 | } |
1668 | ||
f8c9e74f N |
1669 | static int enough(struct r10conf *conf, int ignore) |
1670 | { | |
635f6416 N |
1671 | /* when calling 'enough', both 'prev' and 'geo' must |
1672 | * be stable. | |
1673 | * This is ensured if ->reconfig_mutex or ->device_lock | |
1674 | * is held. | |
1675 | */ | |
1676 | return _enough(conf, 0, ignore) && | |
1677 | _enough(conf, 1, ignore); | |
f8c9e74f N |
1678 | } |
1679 | ||
fd01b88c | 1680 | static void error(struct mddev *mddev, struct md_rdev *rdev) |
1da177e4 LT |
1681 | { |
1682 | char b[BDEVNAME_SIZE]; | |
e879a879 | 1683 | struct r10conf *conf = mddev->private; |
635f6416 | 1684 | unsigned long flags; |
1da177e4 LT |
1685 | |
1686 | /* | |
1687 | * If it is not operational, then we have already marked it as dead | |
1688 | * else if it is the last working disks, ignore the error, let the | |
1689 | * next level up know. | |
1690 | * else mark the drive as failed | |
1691 | */ | |
635f6416 | 1692 | spin_lock_irqsave(&conf->device_lock, flags); |
b2d444d7 | 1693 | if (test_bit(In_sync, &rdev->flags) |
635f6416 | 1694 | && !enough(conf, rdev->raid_disk)) { |
1da177e4 LT |
1695 | /* |
1696 | * Don't fail the drive, just return an IO error. | |
1da177e4 | 1697 | */ |
635f6416 | 1698 | spin_unlock_irqrestore(&conf->device_lock, flags); |
1da177e4 | 1699 | return; |
635f6416 | 1700 | } |
c04be0aa | 1701 | if (test_and_clear_bit(In_sync, &rdev->flags)) { |
1da177e4 | 1702 | mddev->degraded++; |
635f6416 | 1703 | /* |
1da177e4 LT |
1704 | * if recovery is running, make sure it aborts. |
1705 | */ | |
dfc70645 | 1706 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); |
1da177e4 | 1707 | } |
de393cde | 1708 | set_bit(Blocked, &rdev->flags); |
b2d444d7 | 1709 | set_bit(Faulty, &rdev->flags); |
850b2b42 | 1710 | set_bit(MD_CHANGE_DEVS, &mddev->flags); |
635f6416 | 1711 | spin_unlock_irqrestore(&conf->device_lock, flags); |
067032bc JP |
1712 | printk(KERN_ALERT |
1713 | "md/raid10:%s: Disk failure on %s, disabling device.\n" | |
1714 | "md/raid10:%s: Operation continuing on %d devices.\n", | |
128595ed | 1715 | mdname(mddev), bdevname(rdev->bdev, b), |
5cf00fcd | 1716 | mdname(mddev), conf->geo.raid_disks - mddev->degraded); |
1da177e4 LT |
1717 | } |
1718 | ||
e879a879 | 1719 | static void print_conf(struct r10conf *conf) |
1da177e4 LT |
1720 | { |
1721 | int i; | |
dc280d98 | 1722 | struct raid10_info *tmp; |
1da177e4 | 1723 | |
128595ed | 1724 | printk(KERN_DEBUG "RAID10 conf printout:\n"); |
1da177e4 | 1725 | if (!conf) { |
128595ed | 1726 | printk(KERN_DEBUG "(!conf)\n"); |
1da177e4 LT |
1727 | return; |
1728 | } | |
5cf00fcd N |
1729 | printk(KERN_DEBUG " --- wd:%d rd:%d\n", conf->geo.raid_disks - conf->mddev->degraded, |
1730 | conf->geo.raid_disks); | |
1da177e4 | 1731 | |
5cf00fcd | 1732 | for (i = 0; i < conf->geo.raid_disks; i++) { |
1da177e4 LT |
1733 | char b[BDEVNAME_SIZE]; |
1734 | tmp = conf->mirrors + i; | |
1735 | if (tmp->rdev) | |
128595ed | 1736 | printk(KERN_DEBUG " disk %d, wo:%d, o:%d, dev:%s\n", |
b2d444d7 N |
1737 | i, !test_bit(In_sync, &tmp->rdev->flags), |
1738 | !test_bit(Faulty, &tmp->rdev->flags), | |
1da177e4 LT |
1739 | bdevname(tmp->rdev->bdev,b)); |
1740 | } | |
1741 | } | |
1742 | ||
e879a879 | 1743 | static void close_sync(struct r10conf *conf) |
1da177e4 | 1744 | { |
0a27ec96 N |
1745 | wait_barrier(conf); |
1746 | allow_barrier(conf); | |
1da177e4 LT |
1747 | |
1748 | mempool_destroy(conf->r10buf_pool); | |
1749 | conf->r10buf_pool = NULL; | |
1750 | } | |
1751 | ||
fd01b88c | 1752 | static int raid10_spare_active(struct mddev *mddev) |
1da177e4 LT |
1753 | { |
1754 | int i; | |
e879a879 | 1755 | struct r10conf *conf = mddev->private; |
dc280d98 | 1756 | struct raid10_info *tmp; |
6b965620 N |
1757 | int count = 0; |
1758 | unsigned long flags; | |
1da177e4 LT |
1759 | |
1760 | /* | |
1761 | * Find all non-in_sync disks within the RAID10 configuration | |
1762 | * and mark them in_sync | |
1763 | */ | |
5cf00fcd | 1764 | for (i = 0; i < conf->geo.raid_disks; i++) { |
1da177e4 | 1765 | tmp = conf->mirrors + i; |
4ca40c2c N |
1766 | if (tmp->replacement |
1767 | && tmp->replacement->recovery_offset == MaxSector | |
1768 | && !test_bit(Faulty, &tmp->replacement->flags) | |
1769 | && !test_and_set_bit(In_sync, &tmp->replacement->flags)) { | |
1770 | /* Replacement has just become active */ | |
1771 | if (!tmp->rdev | |
1772 | || !test_and_clear_bit(In_sync, &tmp->rdev->flags)) | |
1773 | count++; | |
1774 | if (tmp->rdev) { | |
1775 | /* Replaced device not technically faulty, | |
1776 | * but we need to be sure it gets removed | |
1777 | * and never re-added. | |
1778 | */ | |
1779 | set_bit(Faulty, &tmp->rdev->flags); | |
1780 | sysfs_notify_dirent_safe( | |
1781 | tmp->rdev->sysfs_state); | |
1782 | } | |
1783 | sysfs_notify_dirent_safe(tmp->replacement->sysfs_state); | |
1784 | } else if (tmp->rdev | |
61e4947c | 1785 | && tmp->rdev->recovery_offset == MaxSector |
4ca40c2c N |
1786 | && !test_bit(Faulty, &tmp->rdev->flags) |
1787 | && !test_and_set_bit(In_sync, &tmp->rdev->flags)) { | |
6b965620 | 1788 | count++; |
2863b9eb | 1789 | sysfs_notify_dirent_safe(tmp->rdev->sysfs_state); |
1da177e4 LT |
1790 | } |
1791 | } | |
6b965620 N |
1792 | spin_lock_irqsave(&conf->device_lock, flags); |
1793 | mddev->degraded -= count; | |
1794 | spin_unlock_irqrestore(&conf->device_lock, flags); | |
1da177e4 LT |
1795 | |
1796 | print_conf(conf); | |
6b965620 | 1797 | return count; |
1da177e4 LT |
1798 | } |
1799 | ||
1800 | ||
fd01b88c | 1801 | static int raid10_add_disk(struct mddev *mddev, struct md_rdev *rdev) |
1da177e4 | 1802 | { |
e879a879 | 1803 | struct r10conf *conf = mddev->private; |
199050ea | 1804 | int err = -EEXIST; |
1da177e4 | 1805 | int mirror; |
6c2fce2e | 1806 | int first = 0; |
5cf00fcd | 1807 | int last = conf->geo.raid_disks - 1; |
050b6615 | 1808 | struct request_queue *q = bdev_get_queue(rdev->bdev); |
1da177e4 LT |
1809 | |
1810 | if (mddev->recovery_cp < MaxSector) | |
1811 | /* only hot-add to in-sync arrays, as recovery is | |
1812 | * very different from resync | |
1813 | */ | |
199050ea | 1814 | return -EBUSY; |
635f6416 | 1815 | if (rdev->saved_raid_disk < 0 && !_enough(conf, 1, -1)) |
199050ea | 1816 | return -EINVAL; |
1da177e4 | 1817 | |
a53a6c85 | 1818 | if (rdev->raid_disk >= 0) |
6c2fce2e | 1819 | first = last = rdev->raid_disk; |
1da177e4 | 1820 | |
050b6615 N |
1821 | if (q->merge_bvec_fn) { |
1822 | set_bit(Unmerged, &rdev->flags); | |
1823 | mddev->merge_check_needed = 1; | |
1824 | } | |
1825 | ||
2c4193df | 1826 | if (rdev->saved_raid_disk >= first && |
6cce3b23 N |
1827 | conf->mirrors[rdev->saved_raid_disk].rdev == NULL) |
1828 | mirror = rdev->saved_raid_disk; | |
1829 | else | |
6c2fce2e | 1830 | mirror = first; |
2bb77736 | 1831 | for ( ; mirror <= last ; mirror++) { |
dc280d98 | 1832 | struct raid10_info *p = &conf->mirrors[mirror]; |
2bb77736 N |
1833 | if (p->recovery_disabled == mddev->recovery_disabled) |
1834 | continue; | |
b7044d41 N |
1835 | if (p->rdev) { |
1836 | if (!test_bit(WantReplacement, &p->rdev->flags) || | |
1837 | p->replacement != NULL) | |
1838 | continue; | |
1839 | clear_bit(In_sync, &rdev->flags); | |
1840 | set_bit(Replacement, &rdev->flags); | |
1841 | rdev->raid_disk = mirror; | |
1842 | err = 0; | |
9092c02d JB |
1843 | if (mddev->gendisk) |
1844 | disk_stack_limits(mddev->gendisk, rdev->bdev, | |
1845 | rdev->data_offset << 9); | |
b7044d41 N |
1846 | conf->fullsync = 1; |
1847 | rcu_assign_pointer(p->replacement, rdev); | |
1848 | break; | |
1849 | } | |
1da177e4 | 1850 | |
9092c02d JB |
1851 | if (mddev->gendisk) |
1852 | disk_stack_limits(mddev->gendisk, rdev->bdev, | |
1853 | rdev->data_offset << 9); | |
1da177e4 | 1854 | |
2bb77736 | 1855 | p->head_position = 0; |
d890fa2b | 1856 | p->recovery_disabled = mddev->recovery_disabled - 1; |
2bb77736 N |
1857 | rdev->raid_disk = mirror; |
1858 | err = 0; | |
1859 | if (rdev->saved_raid_disk != mirror) | |
1860 | conf->fullsync = 1; | |
1861 | rcu_assign_pointer(p->rdev, rdev); | |
1862 | break; | |
1863 | } | |
050b6615 N |
1864 | if (err == 0 && test_bit(Unmerged, &rdev->flags)) { |
1865 | /* Some requests might not have seen this new | |
1866 | * merge_bvec_fn. We must wait for them to complete | |
1867 | * before merging the device fully. | |
1868 | * First we make sure any code which has tested | |
1869 | * our function has submitted the request, then | |
1870 | * we wait for all outstanding requests to complete. | |
1871 | */ | |
1872 | synchronize_sched(); | |
e2d59925 N |
1873 | freeze_array(conf, 0); |
1874 | unfreeze_array(conf); | |
050b6615 N |
1875 | clear_bit(Unmerged, &rdev->flags); |
1876 | } | |
ac5e7113 | 1877 | md_integrity_add_rdev(rdev, mddev); |
ed30be07 | 1878 | if (mddev->queue && blk_queue_discard(bdev_get_queue(rdev->bdev))) |
532a2a3f SL |
1879 | queue_flag_set_unlocked(QUEUE_FLAG_DISCARD, mddev->queue); |
1880 | ||
1da177e4 | 1881 | print_conf(conf); |
199050ea | 1882 | return err; |
1da177e4 LT |
1883 | } |
1884 | ||
b8321b68 | 1885 | static int raid10_remove_disk(struct mddev *mddev, struct md_rdev *rdev) |
1da177e4 | 1886 | { |
e879a879 | 1887 | struct r10conf *conf = mddev->private; |
1da177e4 | 1888 | int err = 0; |
b8321b68 | 1889 | int number = rdev->raid_disk; |
c8ab903e | 1890 | struct md_rdev **rdevp; |
dc280d98 | 1891 | struct raid10_info *p = conf->mirrors + number; |
1da177e4 LT |
1892 | |
1893 | print_conf(conf); | |
c8ab903e N |
1894 | if (rdev == p->rdev) |
1895 | rdevp = &p->rdev; | |
1896 | else if (rdev == p->replacement) | |
1897 | rdevp = &p->replacement; | |
1898 | else | |
1899 | return 0; | |
1900 | ||
1901 | if (test_bit(In_sync, &rdev->flags) || | |
1902 | atomic_read(&rdev->nr_pending)) { | |
1903 | err = -EBUSY; | |
1904 | goto abort; | |
1905 | } | |
1906 | /* Only remove faulty devices if recovery | |
1907 | * is not possible. | |
1908 | */ | |
1909 | if (!test_bit(Faulty, &rdev->flags) && | |
1910 | mddev->recovery_disabled != p->recovery_disabled && | |
4ca40c2c | 1911 | (!p->replacement || p->replacement == rdev) && |
63aced61 | 1912 | number < conf->geo.raid_disks && |
c8ab903e N |
1913 | enough(conf, -1)) { |
1914 | err = -EBUSY; | |
1915 | goto abort; | |
1da177e4 | 1916 | } |
c8ab903e N |
1917 | *rdevp = NULL; |
1918 | synchronize_rcu(); | |
1919 | if (atomic_read(&rdev->nr_pending)) { | |
1920 | /* lost the race, try later */ | |
1921 | err = -EBUSY; | |
1922 | *rdevp = rdev; | |
1923 | goto abort; | |
4ca40c2c N |
1924 | } else if (p->replacement) { |
1925 | /* We must have just cleared 'rdev' */ | |
1926 | p->rdev = p->replacement; | |
1927 | clear_bit(Replacement, &p->replacement->flags); | |
1928 | smp_mb(); /* Make sure other CPUs may see both as identical | |
1929 | * but will never see neither -- if they are careful. | |
1930 | */ | |
1931 | p->replacement = NULL; | |
1932 | clear_bit(WantReplacement, &rdev->flags); | |
1933 | } else | |
1934 | /* We might have just remove the Replacement as faulty | |
1935 | * Clear the flag just in case | |
1936 | */ | |
1937 | clear_bit(WantReplacement, &rdev->flags); | |
1938 | ||
c8ab903e N |
1939 | err = md_integrity_register(mddev); |
1940 | ||
1da177e4 LT |
1941 | abort: |
1942 | ||
1943 | print_conf(conf); | |
1944 | return err; | |
1945 | } | |
1946 | ||
1947 | ||
6712ecf8 | 1948 | static void end_sync_read(struct bio *bio, int error) |
1da177e4 | 1949 | { |
9f2c9d12 | 1950 | struct r10bio *r10_bio = bio->bi_private; |
e879a879 | 1951 | struct r10conf *conf = r10_bio->mddev->private; |
778ca018 | 1952 | int d; |
1da177e4 | 1953 | |
3ea7daa5 N |
1954 | if (bio == r10_bio->master_bio) { |
1955 | /* this is a reshape read */ | |
1956 | d = r10_bio->read_slot; /* really the read dev */ | |
1957 | } else | |
1958 | d = find_bio_disk(conf, r10_bio, bio, NULL, NULL); | |
0eb3ff12 N |
1959 | |
1960 | if (test_bit(BIO_UPTODATE, &bio->bi_flags)) | |
1961 | set_bit(R10BIO_Uptodate, &r10_bio->state); | |
e684e41d N |
1962 | else |
1963 | /* The write handler will notice the lack of | |
1964 | * R10BIO_Uptodate and record any errors etc | |
1965 | */ | |
4dbcdc75 N |
1966 | atomic_add(r10_bio->sectors, |
1967 | &conf->mirrors[d].rdev->corrected_errors); | |
1da177e4 LT |
1968 | |
1969 | /* for reconstruct, we always reschedule after a read. | |
1970 | * for resync, only after all reads | |
1971 | */ | |
73d5c38a | 1972 | rdev_dec_pending(conf->mirrors[d].rdev, conf->mddev); |
1da177e4 LT |
1973 | if (test_bit(R10BIO_IsRecover, &r10_bio->state) || |
1974 | atomic_dec_and_test(&r10_bio->remaining)) { | |
1975 | /* we have read all the blocks, | |
1976 | * do the comparison in process context in raid10d | |
1977 | */ | |
1978 | reschedule_retry(r10_bio); | |
1979 | } | |
1da177e4 LT |
1980 | } |
1981 | ||
9f2c9d12 | 1982 | static void end_sync_request(struct r10bio *r10_bio) |
1da177e4 | 1983 | { |
fd01b88c | 1984 | struct mddev *mddev = r10_bio->mddev; |
dfc70645 | 1985 | |
1da177e4 LT |
1986 | while (atomic_dec_and_test(&r10_bio->remaining)) { |
1987 | if (r10_bio->master_bio == NULL) { | |
1988 | /* the primary of several recovery bios */ | |
73d5c38a | 1989 | sector_t s = r10_bio->sectors; |
1a0b7cd8 N |
1990 | if (test_bit(R10BIO_MadeGood, &r10_bio->state) || |
1991 | test_bit(R10BIO_WriteError, &r10_bio->state)) | |
749c55e9 N |
1992 | reschedule_retry(r10_bio); |
1993 | else | |
1994 | put_buf(r10_bio); | |
73d5c38a | 1995 | md_done_sync(mddev, s, 1); |
1da177e4 LT |
1996 | break; |
1997 | } else { | |
9f2c9d12 | 1998 | struct r10bio *r10_bio2 = (struct r10bio *)r10_bio->master_bio; |
1a0b7cd8 N |
1999 | if (test_bit(R10BIO_MadeGood, &r10_bio->state) || |
2000 | test_bit(R10BIO_WriteError, &r10_bio->state)) | |
749c55e9 N |
2001 | reschedule_retry(r10_bio); |
2002 | else | |
2003 | put_buf(r10_bio); | |
1da177e4 LT |
2004 | r10_bio = r10_bio2; |
2005 | } | |
2006 | } | |
1da177e4 LT |
2007 | } |
2008 | ||
5e570289 N |
2009 | static void end_sync_write(struct bio *bio, int error) |
2010 | { | |
2011 | int uptodate = test_bit(BIO_UPTODATE, &bio->bi_flags); | |
9f2c9d12 | 2012 | struct r10bio *r10_bio = bio->bi_private; |
fd01b88c | 2013 | struct mddev *mddev = r10_bio->mddev; |
e879a879 | 2014 | struct r10conf *conf = mddev->private; |
5e570289 N |
2015 | int d; |
2016 | sector_t first_bad; | |
2017 | int bad_sectors; | |
2018 | int slot; | |
9ad1aefc | 2019 | int repl; |
4ca40c2c | 2020 | struct md_rdev *rdev = NULL; |
5e570289 | 2021 | |
9ad1aefc N |
2022 | d = find_bio_disk(conf, r10_bio, bio, &slot, &repl); |
2023 | if (repl) | |
2024 | rdev = conf->mirrors[d].replacement; | |
547414d1 | 2025 | else |
9ad1aefc | 2026 | rdev = conf->mirrors[d].rdev; |
5e570289 N |
2027 | |
2028 | if (!uptodate) { | |
9ad1aefc N |
2029 | if (repl) |
2030 | md_error(mddev, rdev); | |
2031 | else { | |
2032 | set_bit(WriteErrorSeen, &rdev->flags); | |
b7044d41 N |
2033 | if (!test_and_set_bit(WantReplacement, &rdev->flags)) |
2034 | set_bit(MD_RECOVERY_NEEDED, | |
2035 | &rdev->mddev->recovery); | |
9ad1aefc N |
2036 | set_bit(R10BIO_WriteError, &r10_bio->state); |
2037 | } | |
2038 | } else if (is_badblock(rdev, | |
5e570289 N |
2039 | r10_bio->devs[slot].addr, |
2040 | r10_bio->sectors, | |
2041 | &first_bad, &bad_sectors)) | |
2042 | set_bit(R10BIO_MadeGood, &r10_bio->state); | |
2043 | ||
9ad1aefc | 2044 | rdev_dec_pending(rdev, mddev); |
5e570289 N |
2045 | |
2046 | end_sync_request(r10_bio); | |
2047 | } | |
2048 | ||
1da177e4 LT |
2049 | /* |
2050 | * Note: sync and recover and handled very differently for raid10 | |
2051 | * This code is for resync. | |
2052 | * For resync, we read through virtual addresses and read all blocks. | |
2053 | * If there is any error, we schedule a write. The lowest numbered | |
2054 | * drive is authoritative. | |
2055 | * However requests come for physical address, so we need to map. | |
2056 | * For every physical address there are raid_disks/copies virtual addresses, | |
2057 | * which is always are least one, but is not necessarly an integer. | |
2058 | * This means that a physical address can span multiple chunks, so we may | |
2059 | * have to submit multiple io requests for a single sync request. | |
2060 | */ | |
2061 | /* | |
2062 | * We check if all blocks are in-sync and only write to blocks that | |
2063 | * aren't in sync | |
2064 | */ | |
9f2c9d12 | 2065 | static void sync_request_write(struct mddev *mddev, struct r10bio *r10_bio) |
1da177e4 | 2066 | { |
e879a879 | 2067 | struct r10conf *conf = mddev->private; |
1da177e4 LT |
2068 | int i, first; |
2069 | struct bio *tbio, *fbio; | |
f4380a91 | 2070 | int vcnt; |
1da177e4 LT |
2071 | |
2072 | atomic_set(&r10_bio->remaining, 1); | |
2073 | ||
2074 | /* find the first device with a block */ | |
2075 | for (i=0; i<conf->copies; i++) | |
2076 | if (test_bit(BIO_UPTODATE, &r10_bio->devs[i].bio->bi_flags)) | |
2077 | break; | |
2078 | ||
2079 | if (i == conf->copies) | |
2080 | goto done; | |
2081 | ||
2082 | first = i; | |
2083 | fbio = r10_bio->devs[i].bio; | |
2084 | ||
f4380a91 | 2085 | vcnt = (r10_bio->sectors + (PAGE_SIZE >> 9) - 1) >> (PAGE_SHIFT - 9); |
1da177e4 | 2086 | /* now find blocks with errors */ |
0eb3ff12 N |
2087 | for (i=0 ; i < conf->copies ; i++) { |
2088 | int j, d; | |
1da177e4 | 2089 | |
1da177e4 | 2090 | tbio = r10_bio->devs[i].bio; |
0eb3ff12 N |
2091 | |
2092 | if (tbio->bi_end_io != end_sync_read) | |
2093 | continue; | |
2094 | if (i == first) | |
1da177e4 | 2095 | continue; |
0eb3ff12 N |
2096 | if (test_bit(BIO_UPTODATE, &r10_bio->devs[i].bio->bi_flags)) { |
2097 | /* We know that the bi_io_vec layout is the same for | |
2098 | * both 'first' and 'i', so we just compare them. | |
2099 | * All vec entries are PAGE_SIZE; | |
2100 | */ | |
7bb23c49 N |
2101 | int sectors = r10_bio->sectors; |
2102 | for (j = 0; j < vcnt; j++) { | |
2103 | int len = PAGE_SIZE; | |
2104 | if (sectors < (len / 512)) | |
2105 | len = sectors * 512; | |
0eb3ff12 N |
2106 | if (memcmp(page_address(fbio->bi_io_vec[j].bv_page), |
2107 | page_address(tbio->bi_io_vec[j].bv_page), | |
7bb23c49 | 2108 | len)) |
0eb3ff12 | 2109 | break; |
7bb23c49 N |
2110 | sectors -= len/512; |
2111 | } | |
0eb3ff12 N |
2112 | if (j == vcnt) |
2113 | continue; | |
7f7583d4 | 2114 | atomic64_add(r10_bio->sectors, &mddev->resync_mismatches); |
f84ee364 N |
2115 | if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)) |
2116 | /* Don't fix anything. */ | |
2117 | continue; | |
0eb3ff12 | 2118 | } |
f84ee364 N |
2119 | /* Ok, we need to write this bio, either to correct an |
2120 | * inconsistency or to correct an unreadable block. | |
1da177e4 LT |
2121 | * First we need to fixup bv_offset, bv_len and |
2122 | * bi_vecs, as the read request might have corrupted these | |
2123 | */ | |
8be185f2 KO |
2124 | bio_reset(tbio); |
2125 | ||
1da177e4 LT |
2126 | tbio->bi_vcnt = vcnt; |
2127 | tbio->bi_size = r10_bio->sectors << 9; | |
1da177e4 LT |
2128 | tbio->bi_rw = WRITE; |
2129 | tbio->bi_private = r10_bio; | |
2130 | tbio->bi_sector = r10_bio->devs[i].addr; | |
2131 | ||
2132 | for (j=0; j < vcnt ; j++) { | |
2133 | tbio->bi_io_vec[j].bv_offset = 0; | |
2134 | tbio->bi_io_vec[j].bv_len = PAGE_SIZE; | |
2135 | ||
2136 | memcpy(page_address(tbio->bi_io_vec[j].bv_page), | |
2137 | page_address(fbio->bi_io_vec[j].bv_page), | |
2138 | PAGE_SIZE); | |
2139 | } | |
2140 | tbio->bi_end_io = end_sync_write; | |
2141 | ||
2142 | d = r10_bio->devs[i].devnum; | |
2143 | atomic_inc(&conf->mirrors[d].rdev->nr_pending); | |
2144 | atomic_inc(&r10_bio->remaining); | |
aa8b57aa | 2145 | md_sync_acct(conf->mirrors[d].rdev->bdev, bio_sectors(tbio)); |
1da177e4 LT |
2146 | |
2147 | tbio->bi_sector += conf->mirrors[d].rdev->data_offset; | |
2148 | tbio->bi_bdev = conf->mirrors[d].rdev->bdev; | |
2149 | generic_make_request(tbio); | |
2150 | } | |
2151 | ||
9ad1aefc N |
2152 | /* Now write out to any replacement devices |
2153 | * that are active | |
2154 | */ | |
2155 | for (i = 0; i < conf->copies; i++) { | |
2156 | int j, d; | |
9ad1aefc N |
2157 | |
2158 | tbio = r10_bio->devs[i].repl_bio; | |
2159 | if (!tbio || !tbio->bi_end_io) | |
2160 | continue; | |
2161 | if (r10_bio->devs[i].bio->bi_end_io != end_sync_write | |
2162 | && r10_bio->devs[i].bio != fbio) | |
2163 | for (j = 0; j < vcnt; j++) | |
2164 | memcpy(page_address(tbio->bi_io_vec[j].bv_page), | |
2165 | page_address(fbio->bi_io_vec[j].bv_page), | |
2166 | PAGE_SIZE); | |
2167 | d = r10_bio->devs[i].devnum; | |
2168 | atomic_inc(&r10_bio->remaining); | |
2169 | md_sync_acct(conf->mirrors[d].replacement->bdev, | |
aa8b57aa | 2170 | bio_sectors(tbio)); |
9ad1aefc N |
2171 | generic_make_request(tbio); |
2172 | } | |
2173 | ||
1da177e4 LT |
2174 | done: |
2175 | if (atomic_dec_and_test(&r10_bio->remaining)) { | |
2176 | md_done_sync(mddev, r10_bio->sectors, 1); | |
2177 | put_buf(r10_bio); | |
2178 | } | |
2179 | } | |
2180 | ||
2181 | /* | |
2182 | * Now for the recovery code. | |
2183 | * Recovery happens across physical sectors. | |
2184 | * We recover all non-is_sync drives by finding the virtual address of | |
2185 | * each, and then choose a working drive that also has that virt address. | |
2186 | * There is a separate r10_bio for each non-in_sync drive. | |
2187 | * Only the first two slots are in use. The first for reading, | |
2188 | * The second for writing. | |
2189 | * | |
2190 | */ | |
9f2c9d12 | 2191 | static void fix_recovery_read_error(struct r10bio *r10_bio) |
5e570289 N |
2192 | { |
2193 | /* We got a read error during recovery. | |
2194 | * We repeat the read in smaller page-sized sections. | |
2195 | * If a read succeeds, write it to the new device or record | |
2196 | * a bad block if we cannot. | |
2197 | * If a read fails, record a bad block on both old and | |
2198 | * new devices. | |
2199 | */ | |
fd01b88c | 2200 | struct mddev *mddev = r10_bio->mddev; |
e879a879 | 2201 | struct r10conf *conf = mddev->private; |
5e570289 N |
2202 | struct bio *bio = r10_bio->devs[0].bio; |
2203 | sector_t sect = 0; | |
2204 | int sectors = r10_bio->sectors; | |
2205 | int idx = 0; | |
2206 | int dr = r10_bio->devs[0].devnum; | |
2207 | int dw = r10_bio->devs[1].devnum; | |
2208 | ||
2209 | while (sectors) { | |
2210 | int s = sectors; | |
3cb03002 | 2211 | struct md_rdev *rdev; |
5e570289 N |
2212 | sector_t addr; |
2213 | int ok; | |
2214 | ||
2215 | if (s > (PAGE_SIZE>>9)) | |
2216 | s = PAGE_SIZE >> 9; | |
2217 | ||
2218 | rdev = conf->mirrors[dr].rdev; | |
2219 | addr = r10_bio->devs[0].addr + sect, | |
2220 | ok = sync_page_io(rdev, | |
2221 | addr, | |
2222 | s << 9, | |
2223 | bio->bi_io_vec[idx].bv_page, | |
2224 | READ, false); | |
2225 | if (ok) { | |
2226 | rdev = conf->mirrors[dw].rdev; | |
2227 | addr = r10_bio->devs[1].addr + sect; | |
2228 | ok = sync_page_io(rdev, | |
2229 | addr, | |
2230 | s << 9, | |
2231 | bio->bi_io_vec[idx].bv_page, | |
2232 | WRITE, false); | |
b7044d41 | 2233 | if (!ok) { |
5e570289 | 2234 | set_bit(WriteErrorSeen, &rdev->flags); |
b7044d41 N |
2235 | if (!test_and_set_bit(WantReplacement, |
2236 | &rdev->flags)) | |
2237 | set_bit(MD_RECOVERY_NEEDED, | |
2238 | &rdev->mddev->recovery); | |
2239 | } | |
5e570289 N |
2240 | } |
2241 | if (!ok) { | |
2242 | /* We don't worry if we cannot set a bad block - | |
2243 | * it really is bad so there is no loss in not | |
2244 | * recording it yet | |
2245 | */ | |
2246 | rdev_set_badblocks(rdev, addr, s, 0); | |
2247 | ||
2248 | if (rdev != conf->mirrors[dw].rdev) { | |
2249 | /* need bad block on destination too */ | |
3cb03002 | 2250 | struct md_rdev *rdev2 = conf->mirrors[dw].rdev; |
5e570289 N |
2251 | addr = r10_bio->devs[1].addr + sect; |
2252 | ok = rdev_set_badblocks(rdev2, addr, s, 0); | |
2253 | if (!ok) { | |
2254 | /* just abort the recovery */ | |
2255 | printk(KERN_NOTICE | |
2256 | "md/raid10:%s: recovery aborted" | |
2257 | " due to read error\n", | |
2258 | mdname(mddev)); | |
2259 | ||
2260 | conf->mirrors[dw].recovery_disabled | |
2261 | = mddev->recovery_disabled; | |
2262 | set_bit(MD_RECOVERY_INTR, | |
2263 | &mddev->recovery); | |
2264 | break; | |
2265 | } | |
2266 | } | |
2267 | } | |
2268 | ||
2269 | sectors -= s; | |
2270 | sect += s; | |
2271 | idx++; | |
2272 | } | |
2273 | } | |
1da177e4 | 2274 | |
9f2c9d12 | 2275 | static void recovery_request_write(struct mddev *mddev, struct r10bio *r10_bio) |
1da177e4 | 2276 | { |
e879a879 | 2277 | struct r10conf *conf = mddev->private; |
c65060ad | 2278 | int d; |
24afd80d | 2279 | struct bio *wbio, *wbio2; |
1da177e4 | 2280 | |
5e570289 N |
2281 | if (!test_bit(R10BIO_Uptodate, &r10_bio->state)) { |
2282 | fix_recovery_read_error(r10_bio); | |
2283 | end_sync_request(r10_bio); | |
2284 | return; | |
2285 | } | |
2286 | ||
c65060ad NK |
2287 | /* |
2288 | * share the pages with the first bio | |
1da177e4 LT |
2289 | * and submit the write request |
2290 | */ | |
1da177e4 | 2291 | d = r10_bio->devs[1].devnum; |
24afd80d N |
2292 | wbio = r10_bio->devs[1].bio; |
2293 | wbio2 = r10_bio->devs[1].repl_bio; | |
0eb25bb0 N |
2294 | /* Need to test wbio2->bi_end_io before we call |
2295 | * generic_make_request as if the former is NULL, | |
2296 | * the latter is free to free wbio2. | |
2297 | */ | |
2298 | if (wbio2 && !wbio2->bi_end_io) | |
2299 | wbio2 = NULL; | |
24afd80d N |
2300 | if (wbio->bi_end_io) { |
2301 | atomic_inc(&conf->mirrors[d].rdev->nr_pending); | |
aa8b57aa | 2302 | md_sync_acct(conf->mirrors[d].rdev->bdev, bio_sectors(wbio)); |
24afd80d N |
2303 | generic_make_request(wbio); |
2304 | } | |
0eb25bb0 | 2305 | if (wbio2) { |
24afd80d N |
2306 | atomic_inc(&conf->mirrors[d].replacement->nr_pending); |
2307 | md_sync_acct(conf->mirrors[d].replacement->bdev, | |
aa8b57aa | 2308 | bio_sectors(wbio2)); |
24afd80d N |
2309 | generic_make_request(wbio2); |
2310 | } | |
1da177e4 LT |
2311 | } |
2312 | ||
2313 | ||
1e50915f RB |
2314 | /* |
2315 | * Used by fix_read_error() to decay the per rdev read_errors. | |
2316 | * We halve the read error count for every hour that has elapsed | |
2317 | * since the last recorded read error. | |
2318 | * | |
2319 | */ | |
fd01b88c | 2320 | static void check_decay_read_errors(struct mddev *mddev, struct md_rdev *rdev) |
1e50915f RB |
2321 | { |
2322 | struct timespec cur_time_mon; | |
2323 | unsigned long hours_since_last; | |
2324 | unsigned int read_errors = atomic_read(&rdev->read_errors); | |
2325 | ||
2326 | ktime_get_ts(&cur_time_mon); | |
2327 | ||
2328 | if (rdev->last_read_error.tv_sec == 0 && | |
2329 | rdev->last_read_error.tv_nsec == 0) { | |
2330 | /* first time we've seen a read error */ | |
2331 | rdev->last_read_error = cur_time_mon; | |
2332 | return; | |
2333 | } | |
2334 | ||
2335 | hours_since_last = (cur_time_mon.tv_sec - | |
2336 | rdev->last_read_error.tv_sec) / 3600; | |
2337 | ||
2338 | rdev->last_read_error = cur_time_mon; | |
2339 | ||
2340 | /* | |
2341 | * if hours_since_last is > the number of bits in read_errors | |
2342 | * just set read errors to 0. We do this to avoid | |
2343 | * overflowing the shift of read_errors by hours_since_last. | |
2344 | */ | |
2345 | if (hours_since_last >= 8 * sizeof(read_errors)) | |
2346 | atomic_set(&rdev->read_errors, 0); | |
2347 | else | |
2348 | atomic_set(&rdev->read_errors, read_errors >> hours_since_last); | |
2349 | } | |
2350 | ||
3cb03002 | 2351 | static int r10_sync_page_io(struct md_rdev *rdev, sector_t sector, |
58c54fcc N |
2352 | int sectors, struct page *page, int rw) |
2353 | { | |
2354 | sector_t first_bad; | |
2355 | int bad_sectors; | |
2356 | ||
2357 | if (is_badblock(rdev, sector, sectors, &first_bad, &bad_sectors) | |
2358 | && (rw == READ || test_bit(WriteErrorSeen, &rdev->flags))) | |
2359 | return -1; | |
2360 | if (sync_page_io(rdev, sector, sectors << 9, page, rw, false)) | |
2361 | /* success */ | |
2362 | return 1; | |
b7044d41 | 2363 | if (rw == WRITE) { |
58c54fcc | 2364 | set_bit(WriteErrorSeen, &rdev->flags); |
b7044d41 N |
2365 | if (!test_and_set_bit(WantReplacement, &rdev->flags)) |
2366 | set_bit(MD_RECOVERY_NEEDED, | |
2367 | &rdev->mddev->recovery); | |
2368 | } | |
58c54fcc N |
2369 | /* need to record an error - either for the block or the device */ |
2370 | if (!rdev_set_badblocks(rdev, sector, sectors, 0)) | |
2371 | md_error(rdev->mddev, rdev); | |
2372 | return 0; | |
2373 | } | |
2374 | ||
1da177e4 LT |
2375 | /* |
2376 | * This is a kernel thread which: | |
2377 | * | |
2378 | * 1. Retries failed read operations on working mirrors. | |
2379 | * 2. Updates the raid superblock when problems encounter. | |
6814d536 | 2380 | * 3. Performs writes following reads for array synchronising. |
1da177e4 LT |
2381 | */ |
2382 | ||
e879a879 | 2383 | static void fix_read_error(struct r10conf *conf, struct mddev *mddev, struct r10bio *r10_bio) |
6814d536 N |
2384 | { |
2385 | int sect = 0; /* Offset from r10_bio->sector */ | |
2386 | int sectors = r10_bio->sectors; | |
3cb03002 | 2387 | struct md_rdev*rdev; |
1e50915f | 2388 | int max_read_errors = atomic_read(&mddev->max_corr_read_errors); |
0544a21d | 2389 | int d = r10_bio->devs[r10_bio->read_slot].devnum; |
1e50915f | 2390 | |
7c4e06ff N |
2391 | /* still own a reference to this rdev, so it cannot |
2392 | * have been cleared recently. | |
2393 | */ | |
2394 | rdev = conf->mirrors[d].rdev; | |
1e50915f | 2395 | |
7c4e06ff N |
2396 | if (test_bit(Faulty, &rdev->flags)) |
2397 | /* drive has already been failed, just ignore any | |
2398 | more fix_read_error() attempts */ | |
2399 | return; | |
1e50915f | 2400 | |
7c4e06ff N |
2401 | check_decay_read_errors(mddev, rdev); |
2402 | atomic_inc(&rdev->read_errors); | |
2403 | if (atomic_read(&rdev->read_errors) > max_read_errors) { | |
2404 | char b[BDEVNAME_SIZE]; | |
2405 | bdevname(rdev->bdev, b); | |
1e50915f | 2406 | |
7c4e06ff N |
2407 | printk(KERN_NOTICE |
2408 | "md/raid10:%s: %s: Raid device exceeded " | |
2409 | "read_error threshold [cur %d:max %d]\n", | |
2410 | mdname(mddev), b, | |
2411 | atomic_read(&rdev->read_errors), max_read_errors); | |
2412 | printk(KERN_NOTICE | |
2413 | "md/raid10:%s: %s: Failing raid device\n", | |
2414 | mdname(mddev), b); | |
2415 | md_error(mddev, conf->mirrors[d].rdev); | |
fae8cc5e | 2416 | r10_bio->devs[r10_bio->read_slot].bio = IO_BLOCKED; |
7c4e06ff | 2417 | return; |
1e50915f | 2418 | } |
1e50915f | 2419 | |
6814d536 N |
2420 | while(sectors) { |
2421 | int s = sectors; | |
2422 | int sl = r10_bio->read_slot; | |
2423 | int success = 0; | |
2424 | int start; | |
2425 | ||
2426 | if (s > (PAGE_SIZE>>9)) | |
2427 | s = PAGE_SIZE >> 9; | |
2428 | ||
2429 | rcu_read_lock(); | |
2430 | do { | |
8dbed5ce N |
2431 | sector_t first_bad; |
2432 | int bad_sectors; | |
2433 | ||
0544a21d | 2434 | d = r10_bio->devs[sl].devnum; |
6814d536 N |
2435 | rdev = rcu_dereference(conf->mirrors[d].rdev); |
2436 | if (rdev && | |
050b6615 | 2437 | !test_bit(Unmerged, &rdev->flags) && |
8dbed5ce N |
2438 | test_bit(In_sync, &rdev->flags) && |
2439 | is_badblock(rdev, r10_bio->devs[sl].addr + sect, s, | |
2440 | &first_bad, &bad_sectors) == 0) { | |
6814d536 N |
2441 | atomic_inc(&rdev->nr_pending); |
2442 | rcu_read_unlock(); | |
2b193363 | 2443 | success = sync_page_io(rdev, |
6814d536 | 2444 | r10_bio->devs[sl].addr + |
ccebd4c4 | 2445 | sect, |
6814d536 | 2446 | s<<9, |
ccebd4c4 | 2447 | conf->tmppage, READ, false); |
6814d536 N |
2448 | rdev_dec_pending(rdev, mddev); |
2449 | rcu_read_lock(); | |
2450 | if (success) | |
2451 | break; | |
2452 | } | |
2453 | sl++; | |
2454 | if (sl == conf->copies) | |
2455 | sl = 0; | |
2456 | } while (!success && sl != r10_bio->read_slot); | |
2457 | rcu_read_unlock(); | |
2458 | ||
2459 | if (!success) { | |
58c54fcc N |
2460 | /* Cannot read from anywhere, just mark the block |
2461 | * as bad on the first device to discourage future | |
2462 | * reads. | |
2463 | */ | |
6814d536 | 2464 | int dn = r10_bio->devs[r10_bio->read_slot].devnum; |
58c54fcc N |
2465 | rdev = conf->mirrors[dn].rdev; |
2466 | ||
2467 | if (!rdev_set_badblocks( | |
2468 | rdev, | |
2469 | r10_bio->devs[r10_bio->read_slot].addr | |
2470 | + sect, | |
fae8cc5e | 2471 | s, 0)) { |
58c54fcc | 2472 | md_error(mddev, rdev); |
fae8cc5e N |
2473 | r10_bio->devs[r10_bio->read_slot].bio |
2474 | = IO_BLOCKED; | |
2475 | } | |
6814d536 N |
2476 | break; |
2477 | } | |
2478 | ||
2479 | start = sl; | |
2480 | /* write it back and re-read */ | |
2481 | rcu_read_lock(); | |
2482 | while (sl != r10_bio->read_slot) { | |
67b8dc4b | 2483 | char b[BDEVNAME_SIZE]; |
0544a21d | 2484 | |
6814d536 N |
2485 | if (sl==0) |
2486 | sl = conf->copies; | |
2487 | sl--; | |
2488 | d = r10_bio->devs[sl].devnum; | |
2489 | rdev = rcu_dereference(conf->mirrors[d].rdev); | |
1294b9c9 | 2490 | if (!rdev || |
050b6615 | 2491 | test_bit(Unmerged, &rdev->flags) || |
1294b9c9 N |
2492 | !test_bit(In_sync, &rdev->flags)) |
2493 | continue; | |
2494 | ||
2495 | atomic_inc(&rdev->nr_pending); | |
2496 | rcu_read_unlock(); | |
58c54fcc N |
2497 | if (r10_sync_page_io(rdev, |
2498 | r10_bio->devs[sl].addr + | |
2499 | sect, | |
055d3747 | 2500 | s, conf->tmppage, WRITE) |
1294b9c9 N |
2501 | == 0) { |
2502 | /* Well, this device is dead */ | |
2503 | printk(KERN_NOTICE | |
2504 | "md/raid10:%s: read correction " | |
2505 | "write failed" | |
2506 | " (%d sectors at %llu on %s)\n", | |
2507 | mdname(mddev), s, | |
2508 | (unsigned long long)( | |
f8c9e74f N |
2509 | sect + |
2510 | choose_data_offset(r10_bio, | |
2511 | rdev)), | |
1294b9c9 N |
2512 | bdevname(rdev->bdev, b)); |
2513 | printk(KERN_NOTICE "md/raid10:%s: %s: failing " | |
2514 | "drive\n", | |
2515 | mdname(mddev), | |
2516 | bdevname(rdev->bdev, b)); | |
6814d536 | 2517 | } |
1294b9c9 N |
2518 | rdev_dec_pending(rdev, mddev); |
2519 | rcu_read_lock(); | |
6814d536 N |
2520 | } |
2521 | sl = start; | |
2522 | while (sl != r10_bio->read_slot) { | |
1294b9c9 | 2523 | char b[BDEVNAME_SIZE]; |
0544a21d | 2524 | |
6814d536 N |
2525 | if (sl==0) |
2526 | sl = conf->copies; | |
2527 | sl--; | |
2528 | d = r10_bio->devs[sl].devnum; | |
2529 | rdev = rcu_dereference(conf->mirrors[d].rdev); | |
1294b9c9 N |
2530 | if (!rdev || |
2531 | !test_bit(In_sync, &rdev->flags)) | |
2532 | continue; | |
6814d536 | 2533 | |
1294b9c9 N |
2534 | atomic_inc(&rdev->nr_pending); |
2535 | rcu_read_unlock(); | |
58c54fcc N |
2536 | switch (r10_sync_page_io(rdev, |
2537 | r10_bio->devs[sl].addr + | |
2538 | sect, | |
055d3747 | 2539 | s, conf->tmppage, |
58c54fcc N |
2540 | READ)) { |
2541 | case 0: | |
1294b9c9 N |
2542 | /* Well, this device is dead */ |
2543 | printk(KERN_NOTICE | |
2544 | "md/raid10:%s: unable to read back " | |
2545 | "corrected sectors" | |
2546 | " (%d sectors at %llu on %s)\n", | |
2547 | mdname(mddev), s, | |
2548 | (unsigned long long)( | |
f8c9e74f N |
2549 | sect + |
2550 | choose_data_offset(r10_bio, rdev)), | |
1294b9c9 N |
2551 | bdevname(rdev->bdev, b)); |
2552 | printk(KERN_NOTICE "md/raid10:%s: %s: failing " | |
2553 | "drive\n", | |
2554 | mdname(mddev), | |
2555 | bdevname(rdev->bdev, b)); | |
58c54fcc N |
2556 | break; |
2557 | case 1: | |
1294b9c9 N |
2558 | printk(KERN_INFO |
2559 | "md/raid10:%s: read error corrected" | |
2560 | " (%d sectors at %llu on %s)\n", | |
2561 | mdname(mddev), s, | |
2562 | (unsigned long long)( | |
f8c9e74f N |
2563 | sect + |
2564 | choose_data_offset(r10_bio, rdev)), | |
1294b9c9 N |
2565 | bdevname(rdev->bdev, b)); |
2566 | atomic_add(s, &rdev->corrected_errors); | |
6814d536 | 2567 | } |
1294b9c9 N |
2568 | |
2569 | rdev_dec_pending(rdev, mddev); | |
2570 | rcu_read_lock(); | |
6814d536 N |
2571 | } |
2572 | rcu_read_unlock(); | |
2573 | ||
2574 | sectors -= s; | |
2575 | sect += s; | |
2576 | } | |
2577 | } | |
2578 | ||
9f2c9d12 | 2579 | static int narrow_write_error(struct r10bio *r10_bio, int i) |
bd870a16 N |
2580 | { |
2581 | struct bio *bio = r10_bio->master_bio; | |
fd01b88c | 2582 | struct mddev *mddev = r10_bio->mddev; |
e879a879 | 2583 | struct r10conf *conf = mddev->private; |
3cb03002 | 2584 | struct md_rdev *rdev = conf->mirrors[r10_bio->devs[i].devnum].rdev; |
bd870a16 N |
2585 | /* bio has the data to be written to slot 'i' where |
2586 | * we just recently had a write error. | |
2587 | * We repeatedly clone the bio and trim down to one block, | |
2588 | * then try the write. Where the write fails we record | |
2589 | * a bad block. | |
2590 | * It is conceivable that the bio doesn't exactly align with | |
2591 | * blocks. We must handle this. | |
2592 | * | |
2593 | * We currently own a reference to the rdev. | |
2594 | */ | |
2595 | ||
2596 | int block_sectors; | |
2597 | sector_t sector; | |
2598 | int sectors; | |
2599 | int sect_to_write = r10_bio->sectors; | |
2600 | int ok = 1; | |
2601 | ||
2602 | if (rdev->badblocks.shift < 0) | |
2603 | return 0; | |
2604 | ||
2605 | block_sectors = 1 << rdev->badblocks.shift; | |
2606 | sector = r10_bio->sector; | |
2607 | sectors = ((r10_bio->sector + block_sectors) | |
2608 | & ~(sector_t)(block_sectors - 1)) | |
2609 | - sector; | |
2610 | ||
2611 | while (sect_to_write) { | |
2612 | struct bio *wbio; | |
2613 | if (sectors > sect_to_write) | |
2614 | sectors = sect_to_write; | |
2615 | /* Write at 'sector' for 'sectors' */ | |
2616 | wbio = bio_clone_mddev(bio, GFP_NOIO, mddev); | |
6678d83f | 2617 | bio_trim(wbio, sector - bio->bi_sector, sectors); |
bd870a16 | 2618 | wbio->bi_sector = (r10_bio->devs[i].addr+ |
f8c9e74f | 2619 | choose_data_offset(r10_bio, rdev) + |
bd870a16 N |
2620 | (sector - r10_bio->sector)); |
2621 | wbio->bi_bdev = rdev->bdev; | |
2622 | if (submit_bio_wait(WRITE, wbio) == 0) | |
2623 | /* Failure! */ | |
2624 | ok = rdev_set_badblocks(rdev, sector, | |
2625 | sectors, 0) | |
2626 | && ok; | |
2627 | ||
2628 | bio_put(wbio); | |
2629 | sect_to_write -= sectors; | |
2630 | sector += sectors; | |
2631 | sectors = block_sectors; | |
2632 | } | |
2633 | return ok; | |
2634 | } | |
2635 | ||
9f2c9d12 | 2636 | static void handle_read_error(struct mddev *mddev, struct r10bio *r10_bio) |
560f8e55 N |
2637 | { |
2638 | int slot = r10_bio->read_slot; | |
560f8e55 | 2639 | struct bio *bio; |
e879a879 | 2640 | struct r10conf *conf = mddev->private; |
abbf098e | 2641 | struct md_rdev *rdev = r10_bio->devs[slot].rdev; |
560f8e55 N |
2642 | char b[BDEVNAME_SIZE]; |
2643 | unsigned long do_sync; | |
856e08e2 | 2644 | int max_sectors; |
560f8e55 N |
2645 | |
2646 | /* we got a read error. Maybe the drive is bad. Maybe just | |
2647 | * the block and we can fix it. | |
2648 | * We freeze all other IO, and try reading the block from | |
2649 | * other devices. When we find one, we re-write | |
2650 | * and check it that fixes the read error. | |
2651 | * This is all done synchronously while the array is | |
2652 | * frozen. | |
2653 | */ | |
fae8cc5e N |
2654 | bio = r10_bio->devs[slot].bio; |
2655 | bdevname(bio->bi_bdev, b); | |
2656 | bio_put(bio); | |
2657 | r10_bio->devs[slot].bio = NULL; | |
2658 | ||
560f8e55 | 2659 | if (mddev->ro == 0) { |
e2d59925 | 2660 | freeze_array(conf, 1); |
560f8e55 N |
2661 | fix_read_error(conf, mddev, r10_bio); |
2662 | unfreeze_array(conf); | |
fae8cc5e N |
2663 | } else |
2664 | r10_bio->devs[slot].bio = IO_BLOCKED; | |
2665 | ||
abbf098e | 2666 | rdev_dec_pending(rdev, mddev); |
560f8e55 | 2667 | |
7399c31b | 2668 | read_more: |
96c3fd1f N |
2669 | rdev = read_balance(conf, r10_bio, &max_sectors); |
2670 | if (rdev == NULL) { | |
560f8e55 N |
2671 | printk(KERN_ALERT "md/raid10:%s: %s: unrecoverable I/O" |
2672 | " read error for block %llu\n", | |
7399c31b | 2673 | mdname(mddev), b, |
560f8e55 N |
2674 | (unsigned long long)r10_bio->sector); |
2675 | raid_end_bio_io(r10_bio); | |
560f8e55 N |
2676 | return; |
2677 | } | |
2678 | ||
2679 | do_sync = (r10_bio->master_bio->bi_rw & REQ_SYNC); | |
560f8e55 | 2680 | slot = r10_bio->read_slot; |
560f8e55 N |
2681 | printk_ratelimited( |
2682 | KERN_ERR | |
055d3747 | 2683 | "md/raid10:%s: %s: redirecting " |
560f8e55 N |
2684 | "sector %llu to another mirror\n", |
2685 | mdname(mddev), | |
2686 | bdevname(rdev->bdev, b), | |
2687 | (unsigned long long)r10_bio->sector); | |
2688 | bio = bio_clone_mddev(r10_bio->master_bio, | |
2689 | GFP_NOIO, mddev); | |
6678d83f | 2690 | bio_trim(bio, r10_bio->sector - bio->bi_sector, max_sectors); |
560f8e55 | 2691 | r10_bio->devs[slot].bio = bio; |
abbf098e | 2692 | r10_bio->devs[slot].rdev = rdev; |
560f8e55 | 2693 | bio->bi_sector = r10_bio->devs[slot].addr |
f8c9e74f | 2694 | + choose_data_offset(r10_bio, rdev); |
560f8e55 N |
2695 | bio->bi_bdev = rdev->bdev; |
2696 | bio->bi_rw = READ | do_sync; | |
2697 | bio->bi_private = r10_bio; | |
2698 | bio->bi_end_io = raid10_end_read_request; | |
7399c31b N |
2699 | if (max_sectors < r10_bio->sectors) { |
2700 | /* Drat - have to split this up more */ | |
2701 | struct bio *mbio = r10_bio->master_bio; | |
2702 | int sectors_handled = | |
2703 | r10_bio->sector + max_sectors | |
2704 | - mbio->bi_sector; | |
2705 | r10_bio->sectors = max_sectors; | |
2706 | spin_lock_irq(&conf->device_lock); | |
2707 | if (mbio->bi_phys_segments == 0) | |
2708 | mbio->bi_phys_segments = 2; | |
2709 | else | |
2710 | mbio->bi_phys_segments++; | |
2711 | spin_unlock_irq(&conf->device_lock); | |
2712 | generic_make_request(bio); | |
7399c31b N |
2713 | |
2714 | r10_bio = mempool_alloc(conf->r10bio_pool, | |
2715 | GFP_NOIO); | |
2716 | r10_bio->master_bio = mbio; | |
aa8b57aa | 2717 | r10_bio->sectors = bio_sectors(mbio) - sectors_handled; |
7399c31b N |
2718 | r10_bio->state = 0; |
2719 | set_bit(R10BIO_ReadError, | |
2720 | &r10_bio->state); | |
2721 | r10_bio->mddev = mddev; | |
2722 | r10_bio->sector = mbio->bi_sector | |
2723 | + sectors_handled; | |
2724 | ||
2725 | goto read_more; | |
2726 | } else | |
2727 | generic_make_request(bio); | |
560f8e55 N |
2728 | } |
2729 | ||
e879a879 | 2730 | static void handle_write_completed(struct r10conf *conf, struct r10bio *r10_bio) |
749c55e9 N |
2731 | { |
2732 | /* Some sort of write request has finished and it | |
2733 | * succeeded in writing where we thought there was a | |
2734 | * bad block. So forget the bad block. | |
1a0b7cd8 N |
2735 | * Or possibly if failed and we need to record |
2736 | * a bad block. | |
749c55e9 N |
2737 | */ |
2738 | int m; | |
3cb03002 | 2739 | struct md_rdev *rdev; |
749c55e9 N |
2740 | |
2741 | if (test_bit(R10BIO_IsSync, &r10_bio->state) || | |
2742 | test_bit(R10BIO_IsRecover, &r10_bio->state)) { | |
1a0b7cd8 N |
2743 | for (m = 0; m < conf->copies; m++) { |
2744 | int dev = r10_bio->devs[m].devnum; | |
2745 | rdev = conf->mirrors[dev].rdev; | |
2746 | if (r10_bio->devs[m].bio == NULL) | |
2747 | continue; | |
2748 | if (test_bit(BIO_UPTODATE, | |
749c55e9 | 2749 | &r10_bio->devs[m].bio->bi_flags)) { |
749c55e9 N |
2750 | rdev_clear_badblocks( |
2751 | rdev, | |
2752 | r10_bio->devs[m].addr, | |
c6563a8c | 2753 | r10_bio->sectors, 0); |
1a0b7cd8 N |
2754 | } else { |
2755 | if (!rdev_set_badblocks( | |
2756 | rdev, | |
2757 | r10_bio->devs[m].addr, | |
2758 | r10_bio->sectors, 0)) | |
2759 | md_error(conf->mddev, rdev); | |
749c55e9 | 2760 | } |
9ad1aefc N |
2761 | rdev = conf->mirrors[dev].replacement; |
2762 | if (r10_bio->devs[m].repl_bio == NULL) | |
2763 | continue; | |
2764 | if (test_bit(BIO_UPTODATE, | |
2765 | &r10_bio->devs[m].repl_bio->bi_flags)) { | |
2766 | rdev_clear_badblocks( | |
2767 | rdev, | |
2768 | r10_bio->devs[m].addr, | |
c6563a8c | 2769 | r10_bio->sectors, 0); |
9ad1aefc N |
2770 | } else { |
2771 | if (!rdev_set_badblocks( | |
2772 | rdev, | |
2773 | r10_bio->devs[m].addr, | |
2774 | r10_bio->sectors, 0)) | |
2775 | md_error(conf->mddev, rdev); | |
2776 | } | |
1a0b7cd8 | 2777 | } |
749c55e9 N |
2778 | put_buf(r10_bio); |
2779 | } else { | |
bd870a16 N |
2780 | for (m = 0; m < conf->copies; m++) { |
2781 | int dev = r10_bio->devs[m].devnum; | |
2782 | struct bio *bio = r10_bio->devs[m].bio; | |
2783 | rdev = conf->mirrors[dev].rdev; | |
2784 | if (bio == IO_MADE_GOOD) { | |
749c55e9 N |
2785 | rdev_clear_badblocks( |
2786 | rdev, | |
2787 | r10_bio->devs[m].addr, | |
c6563a8c | 2788 | r10_bio->sectors, 0); |
749c55e9 | 2789 | rdev_dec_pending(rdev, conf->mddev); |
bd870a16 N |
2790 | } else if (bio != NULL && |
2791 | !test_bit(BIO_UPTODATE, &bio->bi_flags)) { | |
2792 | if (!narrow_write_error(r10_bio, m)) { | |
2793 | md_error(conf->mddev, rdev); | |
2794 | set_bit(R10BIO_Degraded, | |
2795 | &r10_bio->state); | |
2796 | } | |
2797 | rdev_dec_pending(rdev, conf->mddev); | |
749c55e9 | 2798 | } |
475b0321 N |
2799 | bio = r10_bio->devs[m].repl_bio; |
2800 | rdev = conf->mirrors[dev].replacement; | |
4ca40c2c | 2801 | if (rdev && bio == IO_MADE_GOOD) { |
475b0321 N |
2802 | rdev_clear_badblocks( |
2803 | rdev, | |
2804 | r10_bio->devs[m].addr, | |
c6563a8c | 2805 | r10_bio->sectors, 0); |
475b0321 N |
2806 | rdev_dec_pending(rdev, conf->mddev); |
2807 | } | |
bd870a16 N |
2808 | } |
2809 | if (test_bit(R10BIO_WriteError, | |
2810 | &r10_bio->state)) | |
2811 | close_write(r10_bio); | |
749c55e9 N |
2812 | raid_end_bio_io(r10_bio); |
2813 | } | |
2814 | } | |
2815 | ||
4ed8731d | 2816 | static void raid10d(struct md_thread *thread) |
1da177e4 | 2817 | { |
4ed8731d | 2818 | struct mddev *mddev = thread->mddev; |
9f2c9d12 | 2819 | struct r10bio *r10_bio; |
1da177e4 | 2820 | unsigned long flags; |
e879a879 | 2821 | struct r10conf *conf = mddev->private; |
1da177e4 | 2822 | struct list_head *head = &conf->retry_list; |
e1dfa0a2 | 2823 | struct blk_plug plug; |
1da177e4 LT |
2824 | |
2825 | md_check_recovery(mddev); | |
1da177e4 | 2826 | |
e1dfa0a2 | 2827 | blk_start_plug(&plug); |
1da177e4 | 2828 | for (;;) { |
6cce3b23 | 2829 | |
0021b7bc | 2830 | flush_pending_writes(conf); |
6cce3b23 | 2831 | |
a35e63ef N |
2832 | spin_lock_irqsave(&conf->device_lock, flags); |
2833 | if (list_empty(head)) { | |
2834 | spin_unlock_irqrestore(&conf->device_lock, flags); | |
1da177e4 | 2835 | break; |
a35e63ef | 2836 | } |
9f2c9d12 | 2837 | r10_bio = list_entry(head->prev, struct r10bio, retry_list); |
1da177e4 | 2838 | list_del(head->prev); |
4443ae10 | 2839 | conf->nr_queued--; |
1da177e4 LT |
2840 | spin_unlock_irqrestore(&conf->device_lock, flags); |
2841 | ||
2842 | mddev = r10_bio->mddev; | |
070ec55d | 2843 | conf = mddev->private; |
bd870a16 N |
2844 | if (test_bit(R10BIO_MadeGood, &r10_bio->state) || |
2845 | test_bit(R10BIO_WriteError, &r10_bio->state)) | |
749c55e9 | 2846 | handle_write_completed(conf, r10_bio); |
3ea7daa5 N |
2847 | else if (test_bit(R10BIO_IsReshape, &r10_bio->state)) |
2848 | reshape_request_write(mddev, r10_bio); | |
749c55e9 | 2849 | else if (test_bit(R10BIO_IsSync, &r10_bio->state)) |
1da177e4 | 2850 | sync_request_write(mddev, r10_bio); |
7eaceacc | 2851 | else if (test_bit(R10BIO_IsRecover, &r10_bio->state)) |
1da177e4 | 2852 | recovery_request_write(mddev, r10_bio); |
856e08e2 | 2853 | else if (test_bit(R10BIO_ReadError, &r10_bio->state)) |
560f8e55 | 2854 | handle_read_error(mddev, r10_bio); |
856e08e2 N |
2855 | else { |
2856 | /* just a partial read to be scheduled from a | |
2857 | * separate context | |
2858 | */ | |
2859 | int slot = r10_bio->read_slot; | |
2860 | generic_make_request(r10_bio->devs[slot].bio); | |
2861 | } | |
560f8e55 | 2862 | |
1d9d5241 | 2863 | cond_resched(); |
de393cde N |
2864 | if (mddev->flags & ~(1<<MD_CHANGE_PENDING)) |
2865 | md_check_recovery(mddev); | |
1da177e4 | 2866 | } |
e1dfa0a2 | 2867 | blk_finish_plug(&plug); |
1da177e4 LT |
2868 | } |
2869 | ||
2870 | ||
e879a879 | 2871 | static int init_resync(struct r10conf *conf) |
1da177e4 LT |
2872 | { |
2873 | int buffs; | |
69335ef3 | 2874 | int i; |
1da177e4 LT |
2875 | |
2876 | buffs = RESYNC_WINDOW / RESYNC_BLOCK_SIZE; | |
b6385483 | 2877 | BUG_ON(conf->r10buf_pool); |
69335ef3 | 2878 | conf->have_replacement = 0; |
5cf00fcd | 2879 | for (i = 0; i < conf->geo.raid_disks; i++) |
69335ef3 N |
2880 | if (conf->mirrors[i].replacement) |
2881 | conf->have_replacement = 1; | |
1da177e4 LT |
2882 | conf->r10buf_pool = mempool_create(buffs, r10buf_pool_alloc, r10buf_pool_free, conf); |
2883 | if (!conf->r10buf_pool) | |
2884 | return -ENOMEM; | |
2885 | conf->next_resync = 0; | |
2886 | return 0; | |
2887 | } | |
2888 | ||
2889 | /* | |
2890 | * perform a "sync" on one "block" | |
2891 | * | |
2892 | * We need to make sure that no normal I/O request - particularly write | |
2893 | * requests - conflict with active sync requests. | |
2894 | * | |
2895 | * This is achieved by tracking pending requests and a 'barrier' concept | |
2896 | * that can be installed to exclude normal IO requests. | |
2897 | * | |
2898 | * Resync and recovery are handled very differently. | |
2899 | * We differentiate by looking at MD_RECOVERY_SYNC in mddev->recovery. | |
2900 | * | |
2901 | * For resync, we iterate over virtual addresses, read all copies, | |
2902 | * and update if there are differences. If only one copy is live, | |
2903 | * skip it. | |
2904 | * For recovery, we iterate over physical addresses, read a good | |
2905 | * value for each non-in_sync drive, and over-write. | |
2906 | * | |
2907 | * So, for recovery we may have several outstanding complex requests for a | |
2908 | * given address, one for each out-of-sync device. We model this by allocating | |
2909 | * a number of r10_bio structures, one for each out-of-sync device. | |
2910 | * As we setup these structures, we collect all bio's together into a list | |
2911 | * which we then process collectively to add pages, and then process again | |
2912 | * to pass to generic_make_request. | |
2913 | * | |
2914 | * The r10_bio structures are linked using a borrowed master_bio pointer. | |
2915 | * This link is counted in ->remaining. When the r10_bio that points to NULL | |
2916 | * has its remaining count decremented to 0, the whole complex operation | |
2917 | * is complete. | |
2918 | * | |
2919 | */ | |
2920 | ||
fd01b88c | 2921 | static sector_t sync_request(struct mddev *mddev, sector_t sector_nr, |
ab9d47e9 | 2922 | int *skipped, int go_faster) |
1da177e4 | 2923 | { |
e879a879 | 2924 | struct r10conf *conf = mddev->private; |
9f2c9d12 | 2925 | struct r10bio *r10_bio; |
1da177e4 LT |
2926 | struct bio *biolist = NULL, *bio; |
2927 | sector_t max_sector, nr_sectors; | |
1da177e4 | 2928 | int i; |
6cce3b23 | 2929 | int max_sync; |
57dab0bd | 2930 | sector_t sync_blocks; |
1da177e4 LT |
2931 | sector_t sectors_skipped = 0; |
2932 | int chunks_skipped = 0; | |
5cf00fcd | 2933 | sector_t chunk_mask = conf->geo.chunk_mask; |
1da177e4 LT |
2934 | |
2935 | if (!conf->r10buf_pool) | |
2936 | if (init_resync(conf)) | |
57afd89f | 2937 | return 0; |
1da177e4 | 2938 | |
7e83ccbe MW |
2939 | /* |
2940 | * Allow skipping a full rebuild for incremental assembly | |
2941 | * of a clean array, like RAID1 does. | |
2942 | */ | |
2943 | if (mddev->bitmap == NULL && | |
2944 | mddev->recovery_cp == MaxSector && | |
13765120 N |
2945 | mddev->reshape_position == MaxSector && |
2946 | !test_bit(MD_RECOVERY_SYNC, &mddev->recovery) && | |
7e83ccbe | 2947 | !test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery) && |
13765120 | 2948 | !test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) && |
7e83ccbe MW |
2949 | conf->fullsync == 0) { |
2950 | *skipped = 1; | |
13765120 | 2951 | return mddev->dev_sectors - sector_nr; |
7e83ccbe MW |
2952 | } |
2953 | ||
1da177e4 | 2954 | skipped: |
58c0fed4 | 2955 | max_sector = mddev->dev_sectors; |
3ea7daa5 N |
2956 | if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) || |
2957 | test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)) | |
1da177e4 LT |
2958 | max_sector = mddev->resync_max_sectors; |
2959 | if (sector_nr >= max_sector) { | |
6cce3b23 N |
2960 | /* If we aborted, we need to abort the |
2961 | * sync on the 'current' bitmap chucks (there can | |
2962 | * be several when recovering multiple devices). | |
2963 | * as we may have started syncing it but not finished. | |
2964 | * We can find the current address in | |
2965 | * mddev->curr_resync, but for recovery, | |
2966 | * we need to convert that to several | |
2967 | * virtual addresses. | |
2968 | */ | |
3ea7daa5 N |
2969 | if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)) { |
2970 | end_reshape(conf); | |
2971 | return 0; | |
2972 | } | |
2973 | ||
6cce3b23 N |
2974 | if (mddev->curr_resync < max_sector) { /* aborted */ |
2975 | if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) | |
2976 | bitmap_end_sync(mddev->bitmap, mddev->curr_resync, | |
2977 | &sync_blocks, 1); | |
5cf00fcd | 2978 | else for (i = 0; i < conf->geo.raid_disks; i++) { |
6cce3b23 N |
2979 | sector_t sect = |
2980 | raid10_find_virt(conf, mddev->curr_resync, i); | |
2981 | bitmap_end_sync(mddev->bitmap, sect, | |
2982 | &sync_blocks, 1); | |
2983 | } | |
9ad1aefc N |
2984 | } else { |
2985 | /* completed sync */ | |
2986 | if ((!mddev->bitmap || conf->fullsync) | |
2987 | && conf->have_replacement | |
2988 | && test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) { | |
2989 | /* Completed a full sync so the replacements | |
2990 | * are now fully recovered. | |
2991 | */ | |
5cf00fcd | 2992 | for (i = 0; i < conf->geo.raid_disks; i++) |
9ad1aefc N |
2993 | if (conf->mirrors[i].replacement) |
2994 | conf->mirrors[i].replacement | |
2995 | ->recovery_offset | |
2996 | = MaxSector; | |
2997 | } | |
6cce3b23 | 2998 | conf->fullsync = 0; |
9ad1aefc | 2999 | } |
6cce3b23 | 3000 | bitmap_close_sync(mddev->bitmap); |
1da177e4 | 3001 | close_sync(conf); |
57afd89f | 3002 | *skipped = 1; |
1da177e4 LT |
3003 | return sectors_skipped; |
3004 | } | |
3ea7daa5 N |
3005 | |
3006 | if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)) | |
3007 | return reshape_request(mddev, sector_nr, skipped); | |
3008 | ||
5cf00fcd | 3009 | if (chunks_skipped >= conf->geo.raid_disks) { |
1da177e4 LT |
3010 | /* if there has been nothing to do on any drive, |
3011 | * then there is nothing to do at all.. | |
3012 | */ | |
57afd89f N |
3013 | *skipped = 1; |
3014 | return (max_sector - sector_nr) + sectors_skipped; | |
1da177e4 LT |
3015 | } |
3016 | ||
c6207277 N |
3017 | if (max_sector > mddev->resync_max) |
3018 | max_sector = mddev->resync_max; /* Don't do IO beyond here */ | |
3019 | ||
1da177e4 LT |
3020 | /* make sure whole request will fit in a chunk - if chunks |
3021 | * are meaningful | |
3022 | */ | |
5cf00fcd N |
3023 | if (conf->geo.near_copies < conf->geo.raid_disks && |
3024 | max_sector > (sector_nr | chunk_mask)) | |
3025 | max_sector = (sector_nr | chunk_mask) + 1; | |
1da177e4 LT |
3026 | /* |
3027 | * If there is non-resync activity waiting for us then | |
3028 | * put in a delay to throttle resync. | |
3029 | */ | |
0a27ec96 | 3030 | if (!go_faster && conf->nr_waiting) |
1da177e4 | 3031 | msleep_interruptible(1000); |
1da177e4 LT |
3032 | |
3033 | /* Again, very different code for resync and recovery. | |
3034 | * Both must result in an r10bio with a list of bios that | |
3035 | * have bi_end_io, bi_sector, bi_bdev set, | |
3036 | * and bi_private set to the r10bio. | |
3037 | * For recovery, we may actually create several r10bios | |
3038 | * with 2 bios in each, that correspond to the bios in the main one. | |
3039 | * In this case, the subordinate r10bios link back through a | |
3040 | * borrowed master_bio pointer, and the counter in the master | |
3041 | * includes a ref from each subordinate. | |
3042 | */ | |
3043 | /* First, we decide what to do and set ->bi_end_io | |
3044 | * To end_sync_read if we want to read, and | |
3045 | * end_sync_write if we will want to write. | |
3046 | */ | |
3047 | ||
6cce3b23 | 3048 | max_sync = RESYNC_PAGES << (PAGE_SHIFT-9); |
1da177e4 LT |
3049 | if (!test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) { |
3050 | /* recovery... the complicated one */ | |
e875ecea | 3051 | int j; |
1da177e4 LT |
3052 | r10_bio = NULL; |
3053 | ||
5cf00fcd | 3054 | for (i = 0 ; i < conf->geo.raid_disks; i++) { |
ab9d47e9 | 3055 | int still_degraded; |
9f2c9d12 | 3056 | struct r10bio *rb2; |
ab9d47e9 N |
3057 | sector_t sect; |
3058 | int must_sync; | |
e875ecea | 3059 | int any_working; |
dc280d98 | 3060 | struct raid10_info *mirror = &conf->mirrors[i]; |
24afd80d N |
3061 | |
3062 | if ((mirror->rdev == NULL || | |
3063 | test_bit(In_sync, &mirror->rdev->flags)) | |
3064 | && | |
3065 | (mirror->replacement == NULL || | |
3066 | test_bit(Faulty, | |
3067 | &mirror->replacement->flags))) | |
ab9d47e9 | 3068 | continue; |
1da177e4 | 3069 | |
ab9d47e9 N |
3070 | still_degraded = 0; |
3071 | /* want to reconstruct this device */ | |
3072 | rb2 = r10_bio; | |
3073 | sect = raid10_find_virt(conf, sector_nr, i); | |
fc448a18 N |
3074 | if (sect >= mddev->resync_max_sectors) { |
3075 | /* last stripe is not complete - don't | |
3076 | * try to recover this sector. | |
3077 | */ | |
3078 | continue; | |
3079 | } | |
24afd80d N |
3080 | /* Unless we are doing a full sync, or a replacement |
3081 | * we only need to recover the block if it is set in | |
3082 | * the bitmap | |
ab9d47e9 N |
3083 | */ |
3084 | must_sync = bitmap_start_sync(mddev->bitmap, sect, | |
3085 | &sync_blocks, 1); | |
3086 | if (sync_blocks < max_sync) | |
3087 | max_sync = sync_blocks; | |
3088 | if (!must_sync && | |
24afd80d | 3089 | mirror->replacement == NULL && |
ab9d47e9 N |
3090 | !conf->fullsync) { |
3091 | /* yep, skip the sync_blocks here, but don't assume | |
3092 | * that there will never be anything to do here | |
3093 | */ | |
3094 | chunks_skipped = -1; | |
3095 | continue; | |
3096 | } | |
6cce3b23 | 3097 | |
ab9d47e9 N |
3098 | r10_bio = mempool_alloc(conf->r10buf_pool, GFP_NOIO); |
3099 | raise_barrier(conf, rb2 != NULL); | |
3100 | atomic_set(&r10_bio->remaining, 0); | |
18055569 | 3101 | |
ab9d47e9 N |
3102 | r10_bio->master_bio = (struct bio*)rb2; |
3103 | if (rb2) | |
3104 | atomic_inc(&rb2->remaining); | |
3105 | r10_bio->mddev = mddev; | |
3106 | set_bit(R10BIO_IsRecover, &r10_bio->state); | |
3107 | r10_bio->sector = sect; | |
1da177e4 | 3108 | |
ab9d47e9 N |
3109 | raid10_find_phys(conf, r10_bio); |
3110 | ||
3111 | /* Need to check if the array will still be | |
3112 | * degraded | |
3113 | */ | |
5cf00fcd | 3114 | for (j = 0; j < conf->geo.raid_disks; j++) |
ab9d47e9 N |
3115 | if (conf->mirrors[j].rdev == NULL || |
3116 | test_bit(Faulty, &conf->mirrors[j].rdev->flags)) { | |
3117 | still_degraded = 1; | |
87fc767b | 3118 | break; |
1da177e4 | 3119 | } |
ab9d47e9 N |
3120 | |
3121 | must_sync = bitmap_start_sync(mddev->bitmap, sect, | |
3122 | &sync_blocks, still_degraded); | |
3123 | ||
e875ecea | 3124 | any_working = 0; |
ab9d47e9 | 3125 | for (j=0; j<conf->copies;j++) { |
e875ecea | 3126 | int k; |
ab9d47e9 | 3127 | int d = r10_bio->devs[j].devnum; |
5e570289 | 3128 | sector_t from_addr, to_addr; |
3cb03002 | 3129 | struct md_rdev *rdev; |
40c356ce N |
3130 | sector_t sector, first_bad; |
3131 | int bad_sectors; | |
ab9d47e9 N |
3132 | if (!conf->mirrors[d].rdev || |
3133 | !test_bit(In_sync, &conf->mirrors[d].rdev->flags)) | |
3134 | continue; | |
3135 | /* This is where we read from */ | |
e875ecea | 3136 | any_working = 1; |
40c356ce N |
3137 | rdev = conf->mirrors[d].rdev; |
3138 | sector = r10_bio->devs[j].addr; | |
3139 | ||
3140 | if (is_badblock(rdev, sector, max_sync, | |
3141 | &first_bad, &bad_sectors)) { | |
3142 | if (first_bad > sector) | |
3143 | max_sync = first_bad - sector; | |
3144 | else { | |
3145 | bad_sectors -= (sector | |
3146 | - first_bad); | |
3147 | if (max_sync > bad_sectors) | |
3148 | max_sync = bad_sectors; | |
3149 | continue; | |
3150 | } | |
3151 | } | |
ab9d47e9 | 3152 | bio = r10_bio->devs[0].bio; |
8be185f2 | 3153 | bio_reset(bio); |
ab9d47e9 N |
3154 | bio->bi_next = biolist; |
3155 | biolist = bio; | |
3156 | bio->bi_private = r10_bio; | |
3157 | bio->bi_end_io = end_sync_read; | |
3158 | bio->bi_rw = READ; | |
5e570289 | 3159 | from_addr = r10_bio->devs[j].addr; |
24afd80d N |
3160 | bio->bi_sector = from_addr + rdev->data_offset; |
3161 | bio->bi_bdev = rdev->bdev; | |
3162 | atomic_inc(&rdev->nr_pending); | |
3163 | /* and we write to 'i' (if not in_sync) */ | |
ab9d47e9 N |
3164 | |
3165 | for (k=0; k<conf->copies; k++) | |
3166 | if (r10_bio->devs[k].devnum == i) | |
3167 | break; | |
3168 | BUG_ON(k == conf->copies); | |
5e570289 | 3169 | to_addr = r10_bio->devs[k].addr; |
ab9d47e9 | 3170 | r10_bio->devs[0].devnum = d; |
5e570289 | 3171 | r10_bio->devs[0].addr = from_addr; |
ab9d47e9 | 3172 | r10_bio->devs[1].devnum = i; |
5e570289 | 3173 | r10_bio->devs[1].addr = to_addr; |
ab9d47e9 | 3174 | |
24afd80d N |
3175 | rdev = mirror->rdev; |
3176 | if (!test_bit(In_sync, &rdev->flags)) { | |
3177 | bio = r10_bio->devs[1].bio; | |
8be185f2 | 3178 | bio_reset(bio); |
24afd80d N |
3179 | bio->bi_next = biolist; |
3180 | biolist = bio; | |
3181 | bio->bi_private = r10_bio; | |
3182 | bio->bi_end_io = end_sync_write; | |
3183 | bio->bi_rw = WRITE; | |
3184 | bio->bi_sector = to_addr | |
3185 | + rdev->data_offset; | |
3186 | bio->bi_bdev = rdev->bdev; | |
3187 | atomic_inc(&r10_bio->remaining); | |
3188 | } else | |
3189 | r10_bio->devs[1].bio->bi_end_io = NULL; | |
3190 | ||
3191 | /* and maybe write to replacement */ | |
3192 | bio = r10_bio->devs[1].repl_bio; | |
3193 | if (bio) | |
3194 | bio->bi_end_io = NULL; | |
3195 | rdev = mirror->replacement; | |
3196 | /* Note: if rdev != NULL, then bio | |
3197 | * cannot be NULL as r10buf_pool_alloc will | |
3198 | * have allocated it. | |
3199 | * So the second test here is pointless. | |
3200 | * But it keeps semantic-checkers happy, and | |
3201 | * this comment keeps human reviewers | |
3202 | * happy. | |
3203 | */ | |
3204 | if (rdev == NULL || bio == NULL || | |
3205 | test_bit(Faulty, &rdev->flags)) | |
3206 | break; | |
8be185f2 | 3207 | bio_reset(bio); |
24afd80d N |
3208 | bio->bi_next = biolist; |
3209 | biolist = bio; | |
3210 | bio->bi_private = r10_bio; | |
3211 | bio->bi_end_io = end_sync_write; | |
3212 | bio->bi_rw = WRITE; | |
3213 | bio->bi_sector = to_addr + rdev->data_offset; | |
3214 | bio->bi_bdev = rdev->bdev; | |
3215 | atomic_inc(&r10_bio->remaining); | |
ab9d47e9 N |
3216 | break; |
3217 | } | |
3218 | if (j == conf->copies) { | |
e875ecea N |
3219 | /* Cannot recover, so abort the recovery or |
3220 | * record a bad block */ | |
e875ecea N |
3221 | if (any_working) { |
3222 | /* problem is that there are bad blocks | |
3223 | * on other device(s) | |
3224 | */ | |
3225 | int k; | |
3226 | for (k = 0; k < conf->copies; k++) | |
3227 | if (r10_bio->devs[k].devnum == i) | |
3228 | break; | |
24afd80d N |
3229 | if (!test_bit(In_sync, |
3230 | &mirror->rdev->flags) | |
3231 | && !rdev_set_badblocks( | |
3232 | mirror->rdev, | |
3233 | r10_bio->devs[k].addr, | |
3234 | max_sync, 0)) | |
3235 | any_working = 0; | |
3236 | if (mirror->replacement && | |
3237 | !rdev_set_badblocks( | |
3238 | mirror->replacement, | |
e875ecea N |
3239 | r10_bio->devs[k].addr, |
3240 | max_sync, 0)) | |
3241 | any_working = 0; | |
3242 | } | |
3243 | if (!any_working) { | |
3244 | if (!test_and_set_bit(MD_RECOVERY_INTR, | |
3245 | &mddev->recovery)) | |
3246 | printk(KERN_INFO "md/raid10:%s: insufficient " | |
3247 | "working devices for recovery.\n", | |
3248 | mdname(mddev)); | |
24afd80d | 3249 | mirror->recovery_disabled |
e875ecea N |
3250 | = mddev->recovery_disabled; |
3251 | } | |
e8b84915 N |
3252 | put_buf(r10_bio); |
3253 | if (rb2) | |
3254 | atomic_dec(&rb2->remaining); | |
3255 | r10_bio = rb2; | |
ab9d47e9 | 3256 | break; |
1da177e4 | 3257 | } |
ab9d47e9 | 3258 | } |
1da177e4 LT |
3259 | if (biolist == NULL) { |
3260 | while (r10_bio) { | |
9f2c9d12 N |
3261 | struct r10bio *rb2 = r10_bio; |
3262 | r10_bio = (struct r10bio*) rb2->master_bio; | |
1da177e4 LT |
3263 | rb2->master_bio = NULL; |
3264 | put_buf(rb2); | |
3265 | } | |
3266 | goto giveup; | |
3267 | } | |
3268 | } else { | |
3269 | /* resync. Schedule a read for every block at this virt offset */ | |
3270 | int count = 0; | |
6cce3b23 | 3271 | |
78200d45 N |
3272 | bitmap_cond_end_sync(mddev->bitmap, sector_nr); |
3273 | ||
6cce3b23 N |
3274 | if (!bitmap_start_sync(mddev->bitmap, sector_nr, |
3275 | &sync_blocks, mddev->degraded) && | |
ab9d47e9 N |
3276 | !conf->fullsync && !test_bit(MD_RECOVERY_REQUESTED, |
3277 | &mddev->recovery)) { | |
6cce3b23 N |
3278 | /* We can skip this block */ |
3279 | *skipped = 1; | |
3280 | return sync_blocks + sectors_skipped; | |
3281 | } | |
3282 | if (sync_blocks < max_sync) | |
3283 | max_sync = sync_blocks; | |
1da177e4 LT |
3284 | r10_bio = mempool_alloc(conf->r10buf_pool, GFP_NOIO); |
3285 | ||
1da177e4 LT |
3286 | r10_bio->mddev = mddev; |
3287 | atomic_set(&r10_bio->remaining, 0); | |
6cce3b23 N |
3288 | raise_barrier(conf, 0); |
3289 | conf->next_resync = sector_nr; | |
1da177e4 LT |
3290 | |
3291 | r10_bio->master_bio = NULL; | |
3292 | r10_bio->sector = sector_nr; | |
3293 | set_bit(R10BIO_IsSync, &r10_bio->state); | |
3294 | raid10_find_phys(conf, r10_bio); | |
5cf00fcd | 3295 | r10_bio->sectors = (sector_nr | chunk_mask) - sector_nr + 1; |
1da177e4 | 3296 | |
5cf00fcd | 3297 | for (i = 0; i < conf->copies; i++) { |
1da177e4 | 3298 | int d = r10_bio->devs[i].devnum; |
40c356ce N |
3299 | sector_t first_bad, sector; |
3300 | int bad_sectors; | |
3301 | ||
9ad1aefc N |
3302 | if (r10_bio->devs[i].repl_bio) |
3303 | r10_bio->devs[i].repl_bio->bi_end_io = NULL; | |
3304 | ||
1da177e4 | 3305 | bio = r10_bio->devs[i].bio; |
8be185f2 | 3306 | bio_reset(bio); |
af03b8e4 | 3307 | clear_bit(BIO_UPTODATE, &bio->bi_flags); |
1da177e4 | 3308 | if (conf->mirrors[d].rdev == NULL || |
b2d444d7 | 3309 | test_bit(Faulty, &conf->mirrors[d].rdev->flags)) |
1da177e4 | 3310 | continue; |
40c356ce N |
3311 | sector = r10_bio->devs[i].addr; |
3312 | if (is_badblock(conf->mirrors[d].rdev, | |
3313 | sector, max_sync, | |
3314 | &first_bad, &bad_sectors)) { | |
3315 | if (first_bad > sector) | |
3316 | max_sync = first_bad - sector; | |
3317 | else { | |
3318 | bad_sectors -= (sector - first_bad); | |
3319 | if (max_sync > bad_sectors) | |
91502f09 | 3320 | max_sync = bad_sectors; |
40c356ce N |
3321 | continue; |
3322 | } | |
3323 | } | |
1da177e4 LT |
3324 | atomic_inc(&conf->mirrors[d].rdev->nr_pending); |
3325 | atomic_inc(&r10_bio->remaining); | |
3326 | bio->bi_next = biolist; | |
3327 | biolist = bio; | |
3328 | bio->bi_private = r10_bio; | |
3329 | bio->bi_end_io = end_sync_read; | |
802ba064 | 3330 | bio->bi_rw = READ; |
40c356ce | 3331 | bio->bi_sector = sector + |
1da177e4 LT |
3332 | conf->mirrors[d].rdev->data_offset; |
3333 | bio->bi_bdev = conf->mirrors[d].rdev->bdev; | |
3334 | count++; | |
9ad1aefc N |
3335 | |
3336 | if (conf->mirrors[d].replacement == NULL || | |
3337 | test_bit(Faulty, | |
3338 | &conf->mirrors[d].replacement->flags)) | |
3339 | continue; | |
3340 | ||
3341 | /* Need to set up for writing to the replacement */ | |
3342 | bio = r10_bio->devs[i].repl_bio; | |
8be185f2 | 3343 | bio_reset(bio); |
9ad1aefc N |
3344 | clear_bit(BIO_UPTODATE, &bio->bi_flags); |
3345 | ||
3346 | sector = r10_bio->devs[i].addr; | |
3347 | atomic_inc(&conf->mirrors[d].rdev->nr_pending); | |
3348 | bio->bi_next = biolist; | |
3349 | biolist = bio; | |
3350 | bio->bi_private = r10_bio; | |
3351 | bio->bi_end_io = end_sync_write; | |
3352 | bio->bi_rw = WRITE; | |
3353 | bio->bi_sector = sector + | |
3354 | conf->mirrors[d].replacement->data_offset; | |
3355 | bio->bi_bdev = conf->mirrors[d].replacement->bdev; | |
3356 | count++; | |
1da177e4 LT |
3357 | } |
3358 | ||
3359 | if (count < 2) { | |
3360 | for (i=0; i<conf->copies; i++) { | |
3361 | int d = r10_bio->devs[i].devnum; | |
3362 | if (r10_bio->devs[i].bio->bi_end_io) | |
ab9d47e9 N |
3363 | rdev_dec_pending(conf->mirrors[d].rdev, |
3364 | mddev); | |
9ad1aefc N |
3365 | if (r10_bio->devs[i].repl_bio && |
3366 | r10_bio->devs[i].repl_bio->bi_end_io) | |
3367 | rdev_dec_pending( | |
3368 | conf->mirrors[d].replacement, | |
3369 | mddev); | |
1da177e4 LT |
3370 | } |
3371 | put_buf(r10_bio); | |
3372 | biolist = NULL; | |
3373 | goto giveup; | |
3374 | } | |
3375 | } | |
3376 | ||
1da177e4 | 3377 | nr_sectors = 0; |
6cce3b23 N |
3378 | if (sector_nr + max_sync < max_sector) |
3379 | max_sector = sector_nr + max_sync; | |
1da177e4 LT |
3380 | do { |
3381 | struct page *page; | |
3382 | int len = PAGE_SIZE; | |
1da177e4 LT |
3383 | if (sector_nr + (len>>9) > max_sector) |
3384 | len = (max_sector - sector_nr) << 9; | |
3385 | if (len == 0) | |
3386 | break; | |
3387 | for (bio= biolist ; bio ; bio=bio->bi_next) { | |
ab9d47e9 | 3388 | struct bio *bio2; |
1da177e4 | 3389 | page = bio->bi_io_vec[bio->bi_vcnt].bv_page; |
ab9d47e9 N |
3390 | if (bio_add_page(bio, page, len, 0)) |
3391 | continue; | |
3392 | ||
3393 | /* stop here */ | |
3394 | bio->bi_io_vec[bio->bi_vcnt].bv_page = page; | |
3395 | for (bio2 = biolist; | |
3396 | bio2 && bio2 != bio; | |
3397 | bio2 = bio2->bi_next) { | |
3398 | /* remove last page from this bio */ | |
3399 | bio2->bi_vcnt--; | |
3400 | bio2->bi_size -= len; | |
3401 | bio2->bi_flags &= ~(1<< BIO_SEG_VALID); | |
1da177e4 | 3402 | } |
ab9d47e9 | 3403 | goto bio_full; |
1da177e4 LT |
3404 | } |
3405 | nr_sectors += len>>9; | |
3406 | sector_nr += len>>9; | |
3407 | } while (biolist->bi_vcnt < RESYNC_PAGES); | |
3408 | bio_full: | |
3409 | r10_bio->sectors = nr_sectors; | |
3410 | ||
3411 | while (biolist) { | |
3412 | bio = biolist; | |
3413 | biolist = biolist->bi_next; | |
3414 | ||
3415 | bio->bi_next = NULL; | |
3416 | r10_bio = bio->bi_private; | |
3417 | r10_bio->sectors = nr_sectors; | |
3418 | ||
3419 | if (bio->bi_end_io == end_sync_read) { | |
3420 | md_sync_acct(bio->bi_bdev, nr_sectors); | |
7bb23c49 | 3421 | set_bit(BIO_UPTODATE, &bio->bi_flags); |
1da177e4 LT |
3422 | generic_make_request(bio); |
3423 | } | |
3424 | } | |
3425 | ||
57afd89f N |
3426 | if (sectors_skipped) |
3427 | /* pretend they weren't skipped, it makes | |
3428 | * no important difference in this case | |
3429 | */ | |
3430 | md_done_sync(mddev, sectors_skipped, 1); | |
3431 | ||
1da177e4 LT |
3432 | return sectors_skipped + nr_sectors; |
3433 | giveup: | |
3434 | /* There is nowhere to write, so all non-sync | |
e875ecea N |
3435 | * drives must be failed or in resync, all drives |
3436 | * have a bad block, so try the next chunk... | |
1da177e4 | 3437 | */ |
09b4068a N |
3438 | if (sector_nr + max_sync < max_sector) |
3439 | max_sector = sector_nr + max_sync; | |
3440 | ||
3441 | sectors_skipped += (max_sector - sector_nr); | |
1da177e4 LT |
3442 | chunks_skipped ++; |
3443 | sector_nr = max_sector; | |
1da177e4 | 3444 | goto skipped; |
1da177e4 LT |
3445 | } |
3446 | ||
80c3a6ce | 3447 | static sector_t |
fd01b88c | 3448 | raid10_size(struct mddev *mddev, sector_t sectors, int raid_disks) |
80c3a6ce DW |
3449 | { |
3450 | sector_t size; | |
e879a879 | 3451 | struct r10conf *conf = mddev->private; |
80c3a6ce DW |
3452 | |
3453 | if (!raid_disks) | |
3ea7daa5 N |
3454 | raid_disks = min(conf->geo.raid_disks, |
3455 | conf->prev.raid_disks); | |
80c3a6ce | 3456 | if (!sectors) |
dab8b292 | 3457 | sectors = conf->dev_sectors; |
80c3a6ce | 3458 | |
5cf00fcd N |
3459 | size = sectors >> conf->geo.chunk_shift; |
3460 | sector_div(size, conf->geo.far_copies); | |
80c3a6ce | 3461 | size = size * raid_disks; |
5cf00fcd | 3462 | sector_div(size, conf->geo.near_copies); |
80c3a6ce | 3463 | |
5cf00fcd | 3464 | return size << conf->geo.chunk_shift; |
80c3a6ce DW |
3465 | } |
3466 | ||
6508fdbf N |
3467 | static void calc_sectors(struct r10conf *conf, sector_t size) |
3468 | { | |
3469 | /* Calculate the number of sectors-per-device that will | |
3470 | * actually be used, and set conf->dev_sectors and | |
3471 | * conf->stride | |
3472 | */ | |
3473 | ||
5cf00fcd N |
3474 | size = size >> conf->geo.chunk_shift; |
3475 | sector_div(size, conf->geo.far_copies); | |
3476 | size = size * conf->geo.raid_disks; | |
3477 | sector_div(size, conf->geo.near_copies); | |
6508fdbf N |
3478 | /* 'size' is now the number of chunks in the array */ |
3479 | /* calculate "used chunks per device" */ | |
3480 | size = size * conf->copies; | |
3481 | ||
3482 | /* We need to round up when dividing by raid_disks to | |
3483 | * get the stride size. | |
3484 | */ | |
5cf00fcd | 3485 | size = DIV_ROUND_UP_SECTOR_T(size, conf->geo.raid_disks); |
6508fdbf | 3486 | |
5cf00fcd | 3487 | conf->dev_sectors = size << conf->geo.chunk_shift; |
6508fdbf | 3488 | |
5cf00fcd N |
3489 | if (conf->geo.far_offset) |
3490 | conf->geo.stride = 1 << conf->geo.chunk_shift; | |
6508fdbf | 3491 | else { |
5cf00fcd N |
3492 | sector_div(size, conf->geo.far_copies); |
3493 | conf->geo.stride = size << conf->geo.chunk_shift; | |
6508fdbf N |
3494 | } |
3495 | } | |
dab8b292 | 3496 | |
deb200d0 N |
3497 | enum geo_type {geo_new, geo_old, geo_start}; |
3498 | static int setup_geo(struct geom *geo, struct mddev *mddev, enum geo_type new) | |
3499 | { | |
3500 | int nc, fc, fo; | |
3501 | int layout, chunk, disks; | |
3502 | switch (new) { | |
3503 | case geo_old: | |
3504 | layout = mddev->layout; | |
3505 | chunk = mddev->chunk_sectors; | |
3506 | disks = mddev->raid_disks - mddev->delta_disks; | |
3507 | break; | |
3508 | case geo_new: | |
3509 | layout = mddev->new_layout; | |
3510 | chunk = mddev->new_chunk_sectors; | |
3511 | disks = mddev->raid_disks; | |
3512 | break; | |
3513 | default: /* avoid 'may be unused' warnings */ | |
3514 | case geo_start: /* new when starting reshape - raid_disks not | |
3515 | * updated yet. */ | |
3516 | layout = mddev->new_layout; | |
3517 | chunk = mddev->new_chunk_sectors; | |
3518 | disks = mddev->raid_disks + mddev->delta_disks; | |
3519 | break; | |
3520 | } | |
475901af | 3521 | if (layout >> 18) |
deb200d0 N |
3522 | return -1; |
3523 | if (chunk < (PAGE_SIZE >> 9) || | |
3524 | !is_power_of_2(chunk)) | |
3525 | return -2; | |
3526 | nc = layout & 255; | |
3527 | fc = (layout >> 8) & 255; | |
3528 | fo = layout & (1<<16); | |
3529 | geo->raid_disks = disks; | |
3530 | geo->near_copies = nc; | |
3531 | geo->far_copies = fc; | |
3532 | geo->far_offset = fo; | |
475901af | 3533 | geo->far_set_size = (layout & (1<<17)) ? disks / fc : disks; |
deb200d0 N |
3534 | geo->chunk_mask = chunk - 1; |
3535 | geo->chunk_shift = ffz(~chunk); | |
3536 | return nc*fc; | |
3537 | } | |
3538 | ||
e879a879 | 3539 | static struct r10conf *setup_conf(struct mddev *mddev) |
1da177e4 | 3540 | { |
e879a879 | 3541 | struct r10conf *conf = NULL; |
dab8b292 | 3542 | int err = -EINVAL; |
deb200d0 N |
3543 | struct geom geo; |
3544 | int copies; | |
3545 | ||
3546 | copies = setup_geo(&geo, mddev, geo_new); | |
1da177e4 | 3547 | |
deb200d0 | 3548 | if (copies == -2) { |
128595ed N |
3549 | printk(KERN_ERR "md/raid10:%s: chunk size must be " |
3550 | "at least PAGE_SIZE(%ld) and be a power of 2.\n", | |
3551 | mdname(mddev), PAGE_SIZE); | |
dab8b292 | 3552 | goto out; |
1da177e4 | 3553 | } |
2604b703 | 3554 | |
deb200d0 | 3555 | if (copies < 2 || copies > mddev->raid_disks) { |
128595ed | 3556 | printk(KERN_ERR "md/raid10:%s: unsupported raid10 layout: 0x%8x\n", |
f73ea873 | 3557 | mdname(mddev), mddev->new_layout); |
1da177e4 LT |
3558 | goto out; |
3559 | } | |
dab8b292 TM |
3560 | |
3561 | err = -ENOMEM; | |
e879a879 | 3562 | conf = kzalloc(sizeof(struct r10conf), GFP_KERNEL); |
dab8b292 | 3563 | if (!conf) |
1da177e4 | 3564 | goto out; |
dab8b292 | 3565 | |
3ea7daa5 | 3566 | /* FIXME calc properly */ |
dc280d98 | 3567 | conf->mirrors = kzalloc(sizeof(struct raid10_info)*(mddev->raid_disks + |
78eaa0d4 | 3568 | max(0,-mddev->delta_disks)), |
dab8b292 TM |
3569 | GFP_KERNEL); |
3570 | if (!conf->mirrors) | |
3571 | goto out; | |
4443ae10 N |
3572 | |
3573 | conf->tmppage = alloc_page(GFP_KERNEL); | |
3574 | if (!conf->tmppage) | |
dab8b292 TM |
3575 | goto out; |
3576 | ||
deb200d0 N |
3577 | conf->geo = geo; |
3578 | conf->copies = copies; | |
dab8b292 TM |
3579 | conf->r10bio_pool = mempool_create(NR_RAID10_BIOS, r10bio_pool_alloc, |
3580 | r10bio_pool_free, conf); | |
3581 | if (!conf->r10bio_pool) | |
3582 | goto out; | |
3583 | ||
6508fdbf | 3584 | calc_sectors(conf, mddev->dev_sectors); |
3ea7daa5 N |
3585 | if (mddev->reshape_position == MaxSector) { |
3586 | conf->prev = conf->geo; | |
3587 | conf->reshape_progress = MaxSector; | |
3588 | } else { | |
3589 | if (setup_geo(&conf->prev, mddev, geo_old) != conf->copies) { | |
3590 | err = -EINVAL; | |
3591 | goto out; | |
3592 | } | |
3593 | conf->reshape_progress = mddev->reshape_position; | |
3594 | if (conf->prev.far_offset) | |
3595 | conf->prev.stride = 1 << conf->prev.chunk_shift; | |
3596 | else | |
3597 | /* far_copies must be 1 */ | |
3598 | conf->prev.stride = conf->dev_sectors; | |
3599 | } | |
e7e72bf6 | 3600 | spin_lock_init(&conf->device_lock); |
dab8b292 TM |
3601 | INIT_LIST_HEAD(&conf->retry_list); |
3602 | ||
3603 | spin_lock_init(&conf->resync_lock); | |
3604 | init_waitqueue_head(&conf->wait_barrier); | |
3605 | ||
0232605d | 3606 | conf->thread = md_register_thread(raid10d, mddev, "raid10"); |
dab8b292 TM |
3607 | if (!conf->thread) |
3608 | goto out; | |
3609 | ||
dab8b292 TM |
3610 | conf->mddev = mddev; |
3611 | return conf; | |
3612 | ||
3613 | out: | |
3ea7daa5 N |
3614 | if (err == -ENOMEM) |
3615 | printk(KERN_ERR "md/raid10:%s: couldn't allocate memory.\n", | |
3616 | mdname(mddev)); | |
dab8b292 TM |
3617 | if (conf) { |
3618 | if (conf->r10bio_pool) | |
3619 | mempool_destroy(conf->r10bio_pool); | |
3620 | kfree(conf->mirrors); | |
3621 | safe_put_page(conf->tmppage); | |
3622 | kfree(conf); | |
3623 | } | |
3624 | return ERR_PTR(err); | |
3625 | } | |
3626 | ||
fd01b88c | 3627 | static int run(struct mddev *mddev) |
dab8b292 | 3628 | { |
e879a879 | 3629 | struct r10conf *conf; |
dab8b292 | 3630 | int i, disk_idx, chunk_size; |
dc280d98 | 3631 | struct raid10_info *disk; |
3cb03002 | 3632 | struct md_rdev *rdev; |
dab8b292 | 3633 | sector_t size; |
3ea7daa5 N |
3634 | sector_t min_offset_diff = 0; |
3635 | int first = 1; | |
532a2a3f | 3636 | bool discard_supported = false; |
dab8b292 TM |
3637 | |
3638 | if (mddev->private == NULL) { | |
3639 | conf = setup_conf(mddev); | |
3640 | if (IS_ERR(conf)) | |
3641 | return PTR_ERR(conf); | |
3642 | mddev->private = conf; | |
3643 | } | |
3644 | conf = mddev->private; | |
3645 | if (!conf) | |
3646 | goto out; | |
3647 | ||
dab8b292 TM |
3648 | mddev->thread = conf->thread; |
3649 | conf->thread = NULL; | |
3650 | ||
8f6c2e4b | 3651 | chunk_size = mddev->chunk_sectors << 9; |
cc4d1efd | 3652 | if (mddev->queue) { |
532a2a3f SL |
3653 | blk_queue_max_discard_sectors(mddev->queue, |
3654 | mddev->chunk_sectors); | |
5026d7a9 | 3655 | blk_queue_max_write_same_sectors(mddev->queue, 0); |
cc4d1efd JB |
3656 | blk_queue_io_min(mddev->queue, chunk_size); |
3657 | if (conf->geo.raid_disks % conf->geo.near_copies) | |
3658 | blk_queue_io_opt(mddev->queue, chunk_size * conf->geo.raid_disks); | |
3659 | else | |
3660 | blk_queue_io_opt(mddev->queue, chunk_size * | |
3661 | (conf->geo.raid_disks / conf->geo.near_copies)); | |
3662 | } | |
8f6c2e4b | 3663 | |
dafb20fa | 3664 | rdev_for_each(rdev, mddev) { |
3ea7daa5 | 3665 | long long diff; |
aba336bd | 3666 | struct request_queue *q; |
34b343cf | 3667 | |
1da177e4 | 3668 | disk_idx = rdev->raid_disk; |
f8c9e74f N |
3669 | if (disk_idx < 0) |
3670 | continue; | |
3671 | if (disk_idx >= conf->geo.raid_disks && | |
3672 | disk_idx >= conf->prev.raid_disks) | |
1da177e4 LT |
3673 | continue; |
3674 | disk = conf->mirrors + disk_idx; | |
3675 | ||
56a2559b N |
3676 | if (test_bit(Replacement, &rdev->flags)) { |
3677 | if (disk->replacement) | |
3678 | goto out_free_conf; | |
3679 | disk->replacement = rdev; | |
3680 | } else { | |
3681 | if (disk->rdev) | |
3682 | goto out_free_conf; | |
3683 | disk->rdev = rdev; | |
3684 | } | |
aba336bd N |
3685 | q = bdev_get_queue(rdev->bdev); |
3686 | if (q->merge_bvec_fn) | |
3687 | mddev->merge_check_needed = 1; | |
3ea7daa5 N |
3688 | diff = (rdev->new_data_offset - rdev->data_offset); |
3689 | if (!mddev->reshape_backwards) | |
3690 | diff = -diff; | |
3691 | if (diff < 0) | |
3692 | diff = 0; | |
3693 | if (first || diff < min_offset_diff) | |
3694 | min_offset_diff = diff; | |
56a2559b | 3695 | |
cc4d1efd JB |
3696 | if (mddev->gendisk) |
3697 | disk_stack_limits(mddev->gendisk, rdev->bdev, | |
3698 | rdev->data_offset << 9); | |
1da177e4 LT |
3699 | |
3700 | disk->head_position = 0; | |
532a2a3f SL |
3701 | |
3702 | if (blk_queue_discard(bdev_get_queue(rdev->bdev))) | |
3703 | discard_supported = true; | |
1da177e4 | 3704 | } |
3ea7daa5 | 3705 | |
ed30be07 JB |
3706 | if (mddev->queue) { |
3707 | if (discard_supported) | |
3708 | queue_flag_set_unlocked(QUEUE_FLAG_DISCARD, | |
3709 | mddev->queue); | |
3710 | else | |
3711 | queue_flag_clear_unlocked(QUEUE_FLAG_DISCARD, | |
3712 | mddev->queue); | |
3713 | } | |
6d508242 | 3714 | /* need to check that every block has at least one working mirror */ |
700c7213 | 3715 | if (!enough(conf, -1)) { |
128595ed | 3716 | printk(KERN_ERR "md/raid10:%s: not enough operational mirrors.\n", |
6d508242 | 3717 | mdname(mddev)); |
1da177e4 LT |
3718 | goto out_free_conf; |
3719 | } | |
3720 | ||
3ea7daa5 N |
3721 | if (conf->reshape_progress != MaxSector) { |
3722 | /* must ensure that shape change is supported */ | |
3723 | if (conf->geo.far_copies != 1 && | |
3724 | conf->geo.far_offset == 0) | |
3725 | goto out_free_conf; | |
3726 | if (conf->prev.far_copies != 1 && | |
78eaa0d4 | 3727 | conf->prev.far_offset == 0) |
3ea7daa5 N |
3728 | goto out_free_conf; |
3729 | } | |
3730 | ||
1da177e4 | 3731 | mddev->degraded = 0; |
f8c9e74f N |
3732 | for (i = 0; |
3733 | i < conf->geo.raid_disks | |
3734 | || i < conf->prev.raid_disks; | |
3735 | i++) { | |
1da177e4 LT |
3736 | |
3737 | disk = conf->mirrors + i; | |
3738 | ||
56a2559b N |
3739 | if (!disk->rdev && disk->replacement) { |
3740 | /* The replacement is all we have - use it */ | |
3741 | disk->rdev = disk->replacement; | |
3742 | disk->replacement = NULL; | |
3743 | clear_bit(Replacement, &disk->rdev->flags); | |
3744 | } | |
3745 | ||
5fd6c1dc | 3746 | if (!disk->rdev || |
2e333e89 | 3747 | !test_bit(In_sync, &disk->rdev->flags)) { |
1da177e4 LT |
3748 | disk->head_position = 0; |
3749 | mddev->degraded++; | |
8c2e870a NB |
3750 | if (disk->rdev) |
3751 | conf->fullsync = 1; | |
1da177e4 | 3752 | } |
d890fa2b | 3753 | disk->recovery_disabled = mddev->recovery_disabled - 1; |
1da177e4 LT |
3754 | } |
3755 | ||
8c6ac868 | 3756 | if (mddev->recovery_cp != MaxSector) |
128595ed | 3757 | printk(KERN_NOTICE "md/raid10:%s: not clean" |
8c6ac868 AN |
3758 | " -- starting background reconstruction\n", |
3759 | mdname(mddev)); | |
1da177e4 | 3760 | printk(KERN_INFO |
128595ed | 3761 | "md/raid10:%s: active with %d out of %d devices\n", |
5cf00fcd N |
3762 | mdname(mddev), conf->geo.raid_disks - mddev->degraded, |
3763 | conf->geo.raid_disks); | |
1da177e4 LT |
3764 | /* |
3765 | * Ok, everything is just fine now | |
3766 | */ | |
dab8b292 TM |
3767 | mddev->dev_sectors = conf->dev_sectors; |
3768 | size = raid10_size(mddev, 0, 0); | |
3769 | md_set_array_sectors(mddev, size); | |
3770 | mddev->resync_max_sectors = size; | |
1da177e4 | 3771 | |
cc4d1efd | 3772 | if (mddev->queue) { |
5cf00fcd | 3773 | int stripe = conf->geo.raid_disks * |
9d8f0363 | 3774 | ((mddev->chunk_sectors << 9) / PAGE_SIZE); |
cc4d1efd JB |
3775 | mddev->queue->backing_dev_info.congested_fn = raid10_congested; |
3776 | mddev->queue->backing_dev_info.congested_data = mddev; | |
3777 | ||
3778 | /* Calculate max read-ahead size. | |
3779 | * We need to readahead at least twice a whole stripe.... | |
3780 | * maybe... | |
3781 | */ | |
5cf00fcd | 3782 | stripe /= conf->geo.near_copies; |
3ea7daa5 N |
3783 | if (mddev->queue->backing_dev_info.ra_pages < 2 * stripe) |
3784 | mddev->queue->backing_dev_info.ra_pages = 2 * stripe; | |
cc4d1efd | 3785 | blk_queue_merge_bvec(mddev->queue, raid10_mergeable_bvec); |
1da177e4 LT |
3786 | } |
3787 | ||
a91a2785 MP |
3788 | |
3789 | if (md_integrity_register(mddev)) | |
3790 | goto out_free_conf; | |
3791 | ||
3ea7daa5 N |
3792 | if (conf->reshape_progress != MaxSector) { |
3793 | unsigned long before_length, after_length; | |
3794 | ||
3795 | before_length = ((1 << conf->prev.chunk_shift) * | |
3796 | conf->prev.far_copies); | |
3797 | after_length = ((1 << conf->geo.chunk_shift) * | |
3798 | conf->geo.far_copies); | |
3799 | ||
3800 | if (max(before_length, after_length) > min_offset_diff) { | |
3801 | /* This cannot work */ | |
3802 | printk("md/raid10: offset difference not enough to continue reshape\n"); | |
3803 | goto out_free_conf; | |
3804 | } | |
3805 | conf->offset_diff = min_offset_diff; | |
3806 | ||
3807 | conf->reshape_safe = conf->reshape_progress; | |
3808 | clear_bit(MD_RECOVERY_SYNC, &mddev->recovery); | |
3809 | clear_bit(MD_RECOVERY_CHECK, &mddev->recovery); | |
3810 | set_bit(MD_RECOVERY_RESHAPE, &mddev->recovery); | |
3811 | set_bit(MD_RECOVERY_RUNNING, &mddev->recovery); | |
3812 | mddev->sync_thread = md_register_thread(md_do_sync, mddev, | |
3813 | "reshape"); | |
3814 | } | |
3815 | ||
1da177e4 LT |
3816 | return 0; |
3817 | ||
3818 | out_free_conf: | |
01f96c0a | 3819 | md_unregister_thread(&mddev->thread); |
1da177e4 LT |
3820 | if (conf->r10bio_pool) |
3821 | mempool_destroy(conf->r10bio_pool); | |
1345b1d8 | 3822 | safe_put_page(conf->tmppage); |
990a8baf | 3823 | kfree(conf->mirrors); |
1da177e4 LT |
3824 | kfree(conf); |
3825 | mddev->private = NULL; | |
3826 | out: | |
3827 | return -EIO; | |
3828 | } | |
3829 | ||
fd01b88c | 3830 | static int stop(struct mddev *mddev) |
1da177e4 | 3831 | { |
e879a879 | 3832 | struct r10conf *conf = mddev->private; |
1da177e4 | 3833 | |
409c57f3 N |
3834 | raise_barrier(conf, 0); |
3835 | lower_barrier(conf); | |
3836 | ||
01f96c0a | 3837 | md_unregister_thread(&mddev->thread); |
cc4d1efd JB |
3838 | if (mddev->queue) |
3839 | /* the unplug fn references 'conf'*/ | |
3840 | blk_sync_queue(mddev->queue); | |
3841 | ||
1da177e4 LT |
3842 | if (conf->r10bio_pool) |
3843 | mempool_destroy(conf->r10bio_pool); | |
0fea7ed8 | 3844 | safe_put_page(conf->tmppage); |
990a8baf | 3845 | kfree(conf->mirrors); |
1da177e4 LT |
3846 | kfree(conf); |
3847 | mddev->private = NULL; | |
3848 | return 0; | |
3849 | } | |
3850 | ||
fd01b88c | 3851 | static void raid10_quiesce(struct mddev *mddev, int state) |
6cce3b23 | 3852 | { |
e879a879 | 3853 | struct r10conf *conf = mddev->private; |
6cce3b23 N |
3854 | |
3855 | switch(state) { | |
3856 | case 1: | |
3857 | raise_barrier(conf, 0); | |
3858 | break; | |
3859 | case 0: | |
3860 | lower_barrier(conf); | |
3861 | break; | |
3862 | } | |
6cce3b23 | 3863 | } |
1da177e4 | 3864 | |
006a09a0 N |
3865 | static int raid10_resize(struct mddev *mddev, sector_t sectors) |
3866 | { | |
3867 | /* Resize of 'far' arrays is not supported. | |
3868 | * For 'near' and 'offset' arrays we can set the | |
3869 | * number of sectors used to be an appropriate multiple | |
3870 | * of the chunk size. | |
3871 | * For 'offset', this is far_copies*chunksize. | |
3872 | * For 'near' the multiplier is the LCM of | |
3873 | * near_copies and raid_disks. | |
3874 | * So if far_copies > 1 && !far_offset, fail. | |
3875 | * Else find LCM(raid_disks, near_copy)*far_copies and | |
3876 | * multiply by chunk_size. Then round to this number. | |
3877 | * This is mostly done by raid10_size() | |
3878 | */ | |
3879 | struct r10conf *conf = mddev->private; | |
3880 | sector_t oldsize, size; | |
3881 | ||
f8c9e74f N |
3882 | if (mddev->reshape_position != MaxSector) |
3883 | return -EBUSY; | |
3884 | ||
5cf00fcd | 3885 | if (conf->geo.far_copies > 1 && !conf->geo.far_offset) |
006a09a0 N |
3886 | return -EINVAL; |
3887 | ||
3888 | oldsize = raid10_size(mddev, 0, 0); | |
3889 | size = raid10_size(mddev, sectors, 0); | |
a4a6125a N |
3890 | if (mddev->external_size && |
3891 | mddev->array_sectors > size) | |
006a09a0 | 3892 | return -EINVAL; |
a4a6125a N |
3893 | if (mddev->bitmap) { |
3894 | int ret = bitmap_resize(mddev->bitmap, size, 0, 0); | |
3895 | if (ret) | |
3896 | return ret; | |
3897 | } | |
3898 | md_set_array_sectors(mddev, size); | |
006a09a0 N |
3899 | set_capacity(mddev->gendisk, mddev->array_sectors); |
3900 | revalidate_disk(mddev->gendisk); | |
3901 | if (sectors > mddev->dev_sectors && | |
3902 | mddev->recovery_cp > oldsize) { | |
3903 | mddev->recovery_cp = oldsize; | |
3904 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
3905 | } | |
6508fdbf N |
3906 | calc_sectors(conf, sectors); |
3907 | mddev->dev_sectors = conf->dev_sectors; | |
006a09a0 N |
3908 | mddev->resync_max_sectors = size; |
3909 | return 0; | |
3910 | } | |
3911 | ||
fd01b88c | 3912 | static void *raid10_takeover_raid0(struct mddev *mddev) |
dab8b292 | 3913 | { |
3cb03002 | 3914 | struct md_rdev *rdev; |
e879a879 | 3915 | struct r10conf *conf; |
dab8b292 TM |
3916 | |
3917 | if (mddev->degraded > 0) { | |
128595ed N |
3918 | printk(KERN_ERR "md/raid10:%s: Error: degraded raid0!\n", |
3919 | mdname(mddev)); | |
dab8b292 TM |
3920 | return ERR_PTR(-EINVAL); |
3921 | } | |
3922 | ||
dab8b292 TM |
3923 | /* Set new parameters */ |
3924 | mddev->new_level = 10; | |
3925 | /* new layout: far_copies = 1, near_copies = 2 */ | |
3926 | mddev->new_layout = (1<<8) + 2; | |
3927 | mddev->new_chunk_sectors = mddev->chunk_sectors; | |
3928 | mddev->delta_disks = mddev->raid_disks; | |
dab8b292 TM |
3929 | mddev->raid_disks *= 2; |
3930 | /* make sure it will be not marked as dirty */ | |
3931 | mddev->recovery_cp = MaxSector; | |
3932 | ||
3933 | conf = setup_conf(mddev); | |
02214dc5 | 3934 | if (!IS_ERR(conf)) { |
dafb20fa | 3935 | rdev_for_each(rdev, mddev) |
e93f68a1 N |
3936 | if (rdev->raid_disk >= 0) |
3937 | rdev->new_raid_disk = rdev->raid_disk * 2; | |
02214dc5 KW |
3938 | conf->barrier = 1; |
3939 | } | |
3940 | ||
dab8b292 TM |
3941 | return conf; |
3942 | } | |
3943 | ||
fd01b88c | 3944 | static void *raid10_takeover(struct mddev *mddev) |
dab8b292 | 3945 | { |
e373ab10 | 3946 | struct r0conf *raid0_conf; |
dab8b292 TM |
3947 | |
3948 | /* raid10 can take over: | |
3949 | * raid0 - providing it has only two drives | |
3950 | */ | |
3951 | if (mddev->level == 0) { | |
3952 | /* for raid0 takeover only one zone is supported */ | |
e373ab10 N |
3953 | raid0_conf = mddev->private; |
3954 | if (raid0_conf->nr_strip_zones > 1) { | |
128595ed N |
3955 | printk(KERN_ERR "md/raid10:%s: cannot takeover raid 0" |
3956 | " with more than one zone.\n", | |
3957 | mdname(mddev)); | |
dab8b292 TM |
3958 | return ERR_PTR(-EINVAL); |
3959 | } | |
3960 | return raid10_takeover_raid0(mddev); | |
3961 | } | |
3962 | return ERR_PTR(-EINVAL); | |
3963 | } | |
3964 | ||
3ea7daa5 N |
3965 | static int raid10_check_reshape(struct mddev *mddev) |
3966 | { | |
3967 | /* Called when there is a request to change | |
3968 | * - layout (to ->new_layout) | |
3969 | * - chunk size (to ->new_chunk_sectors) | |
3970 | * - raid_disks (by delta_disks) | |
3971 | * or when trying to restart a reshape that was ongoing. | |
3972 | * | |
3973 | * We need to validate the request and possibly allocate | |
3974 | * space if that might be an issue later. | |
3975 | * | |
3976 | * Currently we reject any reshape of a 'far' mode array, | |
3977 | * allow chunk size to change if new is generally acceptable, | |
3978 | * allow raid_disks to increase, and allow | |
3979 | * a switch between 'near' mode and 'offset' mode. | |
3980 | */ | |
3981 | struct r10conf *conf = mddev->private; | |
3982 | struct geom geo; | |
3983 | ||
3984 | if (conf->geo.far_copies != 1 && !conf->geo.far_offset) | |
3985 | return -EINVAL; | |
3986 | ||
3987 | if (setup_geo(&geo, mddev, geo_start) != conf->copies) | |
3988 | /* mustn't change number of copies */ | |
3989 | return -EINVAL; | |
3990 | if (geo.far_copies > 1 && !geo.far_offset) | |
3991 | /* Cannot switch to 'far' mode */ | |
3992 | return -EINVAL; | |
3993 | ||
3994 | if (mddev->array_sectors & geo.chunk_mask) | |
3995 | /* not factor of array size */ | |
3996 | return -EINVAL; | |
3997 | ||
3ea7daa5 N |
3998 | if (!enough(conf, -1)) |
3999 | return -EINVAL; | |
4000 | ||
4001 | kfree(conf->mirrors_new); | |
4002 | conf->mirrors_new = NULL; | |
4003 | if (mddev->delta_disks > 0) { | |
4004 | /* allocate new 'mirrors' list */ | |
4005 | conf->mirrors_new = kzalloc( | |
dc280d98 | 4006 | sizeof(struct raid10_info) |
3ea7daa5 N |
4007 | *(mddev->raid_disks + |
4008 | mddev->delta_disks), | |
4009 | GFP_KERNEL); | |
4010 | if (!conf->mirrors_new) | |
4011 | return -ENOMEM; | |
4012 | } | |
4013 | return 0; | |
4014 | } | |
4015 | ||
4016 | /* | |
4017 | * Need to check if array has failed when deciding whether to: | |
4018 | * - start an array | |
4019 | * - remove non-faulty devices | |
4020 | * - add a spare | |
4021 | * - allow a reshape | |
4022 | * This determination is simple when no reshape is happening. | |
4023 | * However if there is a reshape, we need to carefully check | |
4024 | * both the before and after sections. | |
4025 | * This is because some failed devices may only affect one | |
4026 | * of the two sections, and some non-in_sync devices may | |
4027 | * be insync in the section most affected by failed devices. | |
4028 | */ | |
4029 | static int calc_degraded(struct r10conf *conf) | |
4030 | { | |
4031 | int degraded, degraded2; | |
4032 | int i; | |
4033 | ||
4034 | rcu_read_lock(); | |
4035 | degraded = 0; | |
4036 | /* 'prev' section first */ | |
4037 | for (i = 0; i < conf->prev.raid_disks; i++) { | |
4038 | struct md_rdev *rdev = rcu_dereference(conf->mirrors[i].rdev); | |
4039 | if (!rdev || test_bit(Faulty, &rdev->flags)) | |
4040 | degraded++; | |
4041 | else if (!test_bit(In_sync, &rdev->flags)) | |
4042 | /* When we can reduce the number of devices in | |
4043 | * an array, this might not contribute to | |
4044 | * 'degraded'. It does now. | |
4045 | */ | |
4046 | degraded++; | |
4047 | } | |
4048 | rcu_read_unlock(); | |
4049 | if (conf->geo.raid_disks == conf->prev.raid_disks) | |
4050 | return degraded; | |
4051 | rcu_read_lock(); | |
4052 | degraded2 = 0; | |
4053 | for (i = 0; i < conf->geo.raid_disks; i++) { | |
4054 | struct md_rdev *rdev = rcu_dereference(conf->mirrors[i].rdev); | |
4055 | if (!rdev || test_bit(Faulty, &rdev->flags)) | |
4056 | degraded2++; | |
4057 | else if (!test_bit(In_sync, &rdev->flags)) { | |
4058 | /* If reshape is increasing the number of devices, | |
4059 | * this section has already been recovered, so | |
4060 | * it doesn't contribute to degraded. | |
4061 | * else it does. | |
4062 | */ | |
4063 | if (conf->geo.raid_disks <= conf->prev.raid_disks) | |
4064 | degraded2++; | |
4065 | } | |
4066 | } | |
4067 | rcu_read_unlock(); | |
4068 | if (degraded2 > degraded) | |
4069 | return degraded2; | |
4070 | return degraded; | |
4071 | } | |
4072 | ||
4073 | static int raid10_start_reshape(struct mddev *mddev) | |
4074 | { | |
4075 | /* A 'reshape' has been requested. This commits | |
4076 | * the various 'new' fields and sets MD_RECOVER_RESHAPE | |
4077 | * This also checks if there are enough spares and adds them | |
4078 | * to the array. | |
4079 | * We currently require enough spares to make the final | |
4080 | * array non-degraded. We also require that the difference | |
4081 | * between old and new data_offset - on each device - is | |
4082 | * enough that we never risk over-writing. | |
4083 | */ | |
4084 | ||
4085 | unsigned long before_length, after_length; | |
4086 | sector_t min_offset_diff = 0; | |
4087 | int first = 1; | |
4088 | struct geom new; | |
4089 | struct r10conf *conf = mddev->private; | |
4090 | struct md_rdev *rdev; | |
4091 | int spares = 0; | |
bb63a701 | 4092 | int ret; |
3ea7daa5 N |
4093 | |
4094 | if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) | |
4095 | return -EBUSY; | |
4096 | ||
4097 | if (setup_geo(&new, mddev, geo_start) != conf->copies) | |
4098 | return -EINVAL; | |
4099 | ||
4100 | before_length = ((1 << conf->prev.chunk_shift) * | |
4101 | conf->prev.far_copies); | |
4102 | after_length = ((1 << conf->geo.chunk_shift) * | |
4103 | conf->geo.far_copies); | |
4104 | ||
4105 | rdev_for_each(rdev, mddev) { | |
4106 | if (!test_bit(In_sync, &rdev->flags) | |
4107 | && !test_bit(Faulty, &rdev->flags)) | |
4108 | spares++; | |
4109 | if (rdev->raid_disk >= 0) { | |
4110 | long long diff = (rdev->new_data_offset | |
4111 | - rdev->data_offset); | |
4112 | if (!mddev->reshape_backwards) | |
4113 | diff = -diff; | |
4114 | if (diff < 0) | |
4115 | diff = 0; | |
4116 | if (first || diff < min_offset_diff) | |
4117 | min_offset_diff = diff; | |
4118 | } | |
4119 | } | |
4120 | ||
4121 | if (max(before_length, after_length) > min_offset_diff) | |
4122 | return -EINVAL; | |
4123 | ||
4124 | if (spares < mddev->delta_disks) | |
4125 | return -EINVAL; | |
4126 | ||
4127 | conf->offset_diff = min_offset_diff; | |
4128 | spin_lock_irq(&conf->device_lock); | |
4129 | if (conf->mirrors_new) { | |
4130 | memcpy(conf->mirrors_new, conf->mirrors, | |
dc280d98 | 4131 | sizeof(struct raid10_info)*conf->prev.raid_disks); |
3ea7daa5 N |
4132 | smp_mb(); |
4133 | kfree(conf->mirrors_old); /* FIXME and elsewhere */ | |
4134 | conf->mirrors_old = conf->mirrors; | |
4135 | conf->mirrors = conf->mirrors_new; | |
4136 | conf->mirrors_new = NULL; | |
4137 | } | |
4138 | setup_geo(&conf->geo, mddev, geo_start); | |
4139 | smp_mb(); | |
4140 | if (mddev->reshape_backwards) { | |
4141 | sector_t size = raid10_size(mddev, 0, 0); | |
4142 | if (size < mddev->array_sectors) { | |
4143 | spin_unlock_irq(&conf->device_lock); | |
4144 | printk(KERN_ERR "md/raid10:%s: array size must be reduce before number of disks\n", | |
4145 | mdname(mddev)); | |
4146 | return -EINVAL; | |
4147 | } | |
4148 | mddev->resync_max_sectors = size; | |
4149 | conf->reshape_progress = size; | |
4150 | } else | |
4151 | conf->reshape_progress = 0; | |
4152 | spin_unlock_irq(&conf->device_lock); | |
4153 | ||
bb63a701 N |
4154 | if (mddev->delta_disks && mddev->bitmap) { |
4155 | ret = bitmap_resize(mddev->bitmap, | |
4156 | raid10_size(mddev, 0, | |
4157 | conf->geo.raid_disks), | |
4158 | 0, 0); | |
4159 | if (ret) | |
4160 | goto abort; | |
4161 | } | |
3ea7daa5 N |
4162 | if (mddev->delta_disks > 0) { |
4163 | rdev_for_each(rdev, mddev) | |
4164 | if (rdev->raid_disk < 0 && | |
4165 | !test_bit(Faulty, &rdev->flags)) { | |
4166 | if (raid10_add_disk(mddev, rdev) == 0) { | |
4167 | if (rdev->raid_disk >= | |
4168 | conf->prev.raid_disks) | |
4169 | set_bit(In_sync, &rdev->flags); | |
4170 | else | |
4171 | rdev->recovery_offset = 0; | |
4172 | ||
4173 | if (sysfs_link_rdev(mddev, rdev)) | |
4174 | /* Failure here is OK */; | |
4175 | } | |
4176 | } else if (rdev->raid_disk >= conf->prev.raid_disks | |
4177 | && !test_bit(Faulty, &rdev->flags)) { | |
4178 | /* This is a spare that was manually added */ | |
4179 | set_bit(In_sync, &rdev->flags); | |
4180 | } | |
4181 | } | |
4182 | /* When a reshape changes the number of devices, | |
4183 | * ->degraded is measured against the larger of the | |
4184 | * pre and post numbers. | |
4185 | */ | |
4186 | spin_lock_irq(&conf->device_lock); | |
4187 | mddev->degraded = calc_degraded(conf); | |
4188 | spin_unlock_irq(&conf->device_lock); | |
4189 | mddev->raid_disks = conf->geo.raid_disks; | |
4190 | mddev->reshape_position = conf->reshape_progress; | |
4191 | set_bit(MD_CHANGE_DEVS, &mddev->flags); | |
4192 | ||
4193 | clear_bit(MD_RECOVERY_SYNC, &mddev->recovery); | |
4194 | clear_bit(MD_RECOVERY_CHECK, &mddev->recovery); | |
4195 | set_bit(MD_RECOVERY_RESHAPE, &mddev->recovery); | |
4196 | set_bit(MD_RECOVERY_RUNNING, &mddev->recovery); | |
4197 | ||
4198 | mddev->sync_thread = md_register_thread(md_do_sync, mddev, | |
4199 | "reshape"); | |
4200 | if (!mddev->sync_thread) { | |
bb63a701 N |
4201 | ret = -EAGAIN; |
4202 | goto abort; | |
3ea7daa5 N |
4203 | } |
4204 | conf->reshape_checkpoint = jiffies; | |
4205 | md_wakeup_thread(mddev->sync_thread); | |
4206 | md_new_event(mddev); | |
4207 | return 0; | |
bb63a701 N |
4208 | |
4209 | abort: | |
4210 | mddev->recovery = 0; | |
4211 | spin_lock_irq(&conf->device_lock); | |
4212 | conf->geo = conf->prev; | |
4213 | mddev->raid_disks = conf->geo.raid_disks; | |
4214 | rdev_for_each(rdev, mddev) | |
4215 | rdev->new_data_offset = rdev->data_offset; | |
4216 | smp_wmb(); | |
4217 | conf->reshape_progress = MaxSector; | |
4218 | mddev->reshape_position = MaxSector; | |
4219 | spin_unlock_irq(&conf->device_lock); | |
4220 | return ret; | |
3ea7daa5 N |
4221 | } |
4222 | ||
4223 | /* Calculate the last device-address that could contain | |
4224 | * any block from the chunk that includes the array-address 's' | |
4225 | * and report the next address. | |
4226 | * i.e. the address returned will be chunk-aligned and after | |
4227 | * any data that is in the chunk containing 's'. | |
4228 | */ | |
4229 | static sector_t last_dev_address(sector_t s, struct geom *geo) | |
4230 | { | |
4231 | s = (s | geo->chunk_mask) + 1; | |
4232 | s >>= geo->chunk_shift; | |
4233 | s *= geo->near_copies; | |
4234 | s = DIV_ROUND_UP_SECTOR_T(s, geo->raid_disks); | |
4235 | s *= geo->far_copies; | |
4236 | s <<= geo->chunk_shift; | |
4237 | return s; | |
4238 | } | |
4239 | ||
4240 | /* Calculate the first device-address that could contain | |
4241 | * any block from the chunk that includes the array-address 's'. | |
4242 | * This too will be the start of a chunk | |
4243 | */ | |
4244 | static sector_t first_dev_address(sector_t s, struct geom *geo) | |
4245 | { | |
4246 | s >>= geo->chunk_shift; | |
4247 | s *= geo->near_copies; | |
4248 | sector_div(s, geo->raid_disks); | |
4249 | s *= geo->far_copies; | |
4250 | s <<= geo->chunk_shift; | |
4251 | return s; | |
4252 | } | |
4253 | ||
4254 | static sector_t reshape_request(struct mddev *mddev, sector_t sector_nr, | |
4255 | int *skipped) | |
4256 | { | |
4257 | /* We simply copy at most one chunk (smallest of old and new) | |
4258 | * at a time, possibly less if that exceeds RESYNC_PAGES, | |
4259 | * or we hit a bad block or something. | |
4260 | * This might mean we pause for normal IO in the middle of | |
4261 | * a chunk, but that is not a problem was mddev->reshape_position | |
4262 | * can record any location. | |
4263 | * | |
4264 | * If we will want to write to a location that isn't | |
4265 | * yet recorded as 'safe' (i.e. in metadata on disk) then | |
4266 | * we need to flush all reshape requests and update the metadata. | |
4267 | * | |
4268 | * When reshaping forwards (e.g. to more devices), we interpret | |
4269 | * 'safe' as the earliest block which might not have been copied | |
4270 | * down yet. We divide this by previous stripe size and multiply | |
4271 | * by previous stripe length to get lowest device offset that we | |
4272 | * cannot write to yet. | |
4273 | * We interpret 'sector_nr' as an address that we want to write to. | |
4274 | * From this we use last_device_address() to find where we might | |
4275 | * write to, and first_device_address on the 'safe' position. | |
4276 | * If this 'next' write position is after the 'safe' position, | |
4277 | * we must update the metadata to increase the 'safe' position. | |
4278 | * | |
4279 | * When reshaping backwards, we round in the opposite direction | |
4280 | * and perform the reverse test: next write position must not be | |
4281 | * less than current safe position. | |
4282 | * | |
4283 | * In all this the minimum difference in data offsets | |
4284 | * (conf->offset_diff - always positive) allows a bit of slack, | |
4285 | * so next can be after 'safe', but not by more than offset_disk | |
4286 | * | |
4287 | * We need to prepare all the bios here before we start any IO | |
4288 | * to ensure the size we choose is acceptable to all devices. | |
4289 | * The means one for each copy for write-out and an extra one for | |
4290 | * read-in. | |
4291 | * We store the read-in bio in ->master_bio and the others in | |
4292 | * ->devs[x].bio and ->devs[x].repl_bio. | |
4293 | */ | |
4294 | struct r10conf *conf = mddev->private; | |
4295 | struct r10bio *r10_bio; | |
4296 | sector_t next, safe, last; | |
4297 | int max_sectors; | |
4298 | int nr_sectors; | |
4299 | int s; | |
4300 | struct md_rdev *rdev; | |
4301 | int need_flush = 0; | |
4302 | struct bio *blist; | |
4303 | struct bio *bio, *read_bio; | |
4304 | int sectors_done = 0; | |
4305 | ||
4306 | if (sector_nr == 0) { | |
4307 | /* If restarting in the middle, skip the initial sectors */ | |
4308 | if (mddev->reshape_backwards && | |
4309 | conf->reshape_progress < raid10_size(mddev, 0, 0)) { | |
4310 | sector_nr = (raid10_size(mddev, 0, 0) | |
4311 | - conf->reshape_progress); | |
4312 | } else if (!mddev->reshape_backwards && | |
4313 | conf->reshape_progress > 0) | |
4314 | sector_nr = conf->reshape_progress; | |
4315 | if (sector_nr) { | |
4316 | mddev->curr_resync_completed = sector_nr; | |
4317 | sysfs_notify(&mddev->kobj, NULL, "sync_completed"); | |
4318 | *skipped = 1; | |
4319 | return sector_nr; | |
4320 | } | |
4321 | } | |
4322 | ||
4323 | /* We don't use sector_nr to track where we are up to | |
4324 | * as that doesn't work well for ->reshape_backwards. | |
4325 | * So just use ->reshape_progress. | |
4326 | */ | |
4327 | if (mddev->reshape_backwards) { | |
4328 | /* 'next' is the earliest device address that we might | |
4329 | * write to for this chunk in the new layout | |
4330 | */ | |
4331 | next = first_dev_address(conf->reshape_progress - 1, | |
4332 | &conf->geo); | |
4333 | ||
4334 | /* 'safe' is the last device address that we might read from | |
4335 | * in the old layout after a restart | |
4336 | */ | |
4337 | safe = last_dev_address(conf->reshape_safe - 1, | |
4338 | &conf->prev); | |
4339 | ||
4340 | if (next + conf->offset_diff < safe) | |
4341 | need_flush = 1; | |
4342 | ||
4343 | last = conf->reshape_progress - 1; | |
4344 | sector_nr = last & ~(sector_t)(conf->geo.chunk_mask | |
4345 | & conf->prev.chunk_mask); | |
4346 | if (sector_nr + RESYNC_BLOCK_SIZE/512 < last) | |
4347 | sector_nr = last + 1 - RESYNC_BLOCK_SIZE/512; | |
4348 | } else { | |
4349 | /* 'next' is after the last device address that we | |
4350 | * might write to for this chunk in the new layout | |
4351 | */ | |
4352 | next = last_dev_address(conf->reshape_progress, &conf->geo); | |
4353 | ||
4354 | /* 'safe' is the earliest device address that we might | |
4355 | * read from in the old layout after a restart | |
4356 | */ | |
4357 | safe = first_dev_address(conf->reshape_safe, &conf->prev); | |
4358 | ||
4359 | /* Need to update metadata if 'next' might be beyond 'safe' | |
4360 | * as that would possibly corrupt data | |
4361 | */ | |
4362 | if (next > safe + conf->offset_diff) | |
4363 | need_flush = 1; | |
4364 | ||
4365 | sector_nr = conf->reshape_progress; | |
4366 | last = sector_nr | (conf->geo.chunk_mask | |
4367 | & conf->prev.chunk_mask); | |
4368 | ||
4369 | if (sector_nr + RESYNC_BLOCK_SIZE/512 <= last) | |
4370 | last = sector_nr + RESYNC_BLOCK_SIZE/512 - 1; | |
4371 | } | |
4372 | ||
4373 | if (need_flush || | |
4374 | time_after(jiffies, conf->reshape_checkpoint + 10*HZ)) { | |
4375 | /* Need to update reshape_position in metadata */ | |
4376 | wait_barrier(conf); | |
4377 | mddev->reshape_position = conf->reshape_progress; | |
4378 | if (mddev->reshape_backwards) | |
4379 | mddev->curr_resync_completed = raid10_size(mddev, 0, 0) | |
4380 | - conf->reshape_progress; | |
4381 | else | |
4382 | mddev->curr_resync_completed = conf->reshape_progress; | |
4383 | conf->reshape_checkpoint = jiffies; | |
4384 | set_bit(MD_CHANGE_DEVS, &mddev->flags); | |
4385 | md_wakeup_thread(mddev->thread); | |
4386 | wait_event(mddev->sb_wait, mddev->flags == 0 || | |
c91abf5a N |
4387 | test_bit(MD_RECOVERY_INTR, &mddev->recovery)); |
4388 | if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) { | |
4389 | allow_barrier(conf); | |
4390 | return sectors_done; | |
4391 | } | |
3ea7daa5 N |
4392 | conf->reshape_safe = mddev->reshape_position; |
4393 | allow_barrier(conf); | |
4394 | } | |
4395 | ||
4396 | read_more: | |
4397 | /* Now schedule reads for blocks from sector_nr to last */ | |
4398 | r10_bio = mempool_alloc(conf->r10buf_pool, GFP_NOIO); | |
4399 | raise_barrier(conf, sectors_done != 0); | |
4400 | atomic_set(&r10_bio->remaining, 0); | |
4401 | r10_bio->mddev = mddev; | |
4402 | r10_bio->sector = sector_nr; | |
4403 | set_bit(R10BIO_IsReshape, &r10_bio->state); | |
4404 | r10_bio->sectors = last - sector_nr + 1; | |
4405 | rdev = read_balance(conf, r10_bio, &max_sectors); | |
4406 | BUG_ON(!test_bit(R10BIO_Previous, &r10_bio->state)); | |
4407 | ||
4408 | if (!rdev) { | |
4409 | /* Cannot read from here, so need to record bad blocks | |
4410 | * on all the target devices. | |
4411 | */ | |
4412 | // FIXME | |
4413 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); | |
4414 | return sectors_done; | |
4415 | } | |
4416 | ||
4417 | read_bio = bio_alloc_mddev(GFP_KERNEL, RESYNC_PAGES, mddev); | |
4418 | ||
4419 | read_bio->bi_bdev = rdev->bdev; | |
4420 | read_bio->bi_sector = (r10_bio->devs[r10_bio->read_slot].addr | |
4421 | + rdev->data_offset); | |
4422 | read_bio->bi_private = r10_bio; | |
4423 | read_bio->bi_end_io = end_sync_read; | |
4424 | read_bio->bi_rw = READ; | |
4425 | read_bio->bi_flags &= ~(BIO_POOL_MASK - 1); | |
4426 | read_bio->bi_flags |= 1 << BIO_UPTODATE; | |
4427 | read_bio->bi_vcnt = 0; | |
3ea7daa5 N |
4428 | read_bio->bi_size = 0; |
4429 | r10_bio->master_bio = read_bio; | |
4430 | r10_bio->read_slot = r10_bio->devs[r10_bio->read_slot].devnum; | |
4431 | ||
4432 | /* Now find the locations in the new layout */ | |
4433 | __raid10_find_phys(&conf->geo, r10_bio); | |
4434 | ||
4435 | blist = read_bio; | |
4436 | read_bio->bi_next = NULL; | |
4437 | ||
4438 | for (s = 0; s < conf->copies*2; s++) { | |
4439 | struct bio *b; | |
4440 | int d = r10_bio->devs[s/2].devnum; | |
4441 | struct md_rdev *rdev2; | |
4442 | if (s&1) { | |
4443 | rdev2 = conf->mirrors[d].replacement; | |
4444 | b = r10_bio->devs[s/2].repl_bio; | |
4445 | } else { | |
4446 | rdev2 = conf->mirrors[d].rdev; | |
4447 | b = r10_bio->devs[s/2].bio; | |
4448 | } | |
4449 | if (!rdev2 || test_bit(Faulty, &rdev2->flags)) | |
4450 | continue; | |
8be185f2 KO |
4451 | |
4452 | bio_reset(b); | |
3ea7daa5 N |
4453 | b->bi_bdev = rdev2->bdev; |
4454 | b->bi_sector = r10_bio->devs[s/2].addr + rdev2->new_data_offset; | |
4455 | b->bi_private = r10_bio; | |
4456 | b->bi_end_io = end_reshape_write; | |
4457 | b->bi_rw = WRITE; | |
3ea7daa5 | 4458 | b->bi_next = blist; |
3ea7daa5 N |
4459 | blist = b; |
4460 | } | |
4461 | ||
4462 | /* Now add as many pages as possible to all of these bios. */ | |
4463 | ||
4464 | nr_sectors = 0; | |
4465 | for (s = 0 ; s < max_sectors; s += PAGE_SIZE >> 9) { | |
4466 | struct page *page = r10_bio->devs[0].bio->bi_io_vec[s/(PAGE_SIZE>>9)].bv_page; | |
4467 | int len = (max_sectors - s) << 9; | |
4468 | if (len > PAGE_SIZE) | |
4469 | len = PAGE_SIZE; | |
4470 | for (bio = blist; bio ; bio = bio->bi_next) { | |
4471 | struct bio *bio2; | |
4472 | if (bio_add_page(bio, page, len, 0)) | |
4473 | continue; | |
4474 | ||
4475 | /* Didn't fit, must stop */ | |
4476 | for (bio2 = blist; | |
4477 | bio2 && bio2 != bio; | |
4478 | bio2 = bio2->bi_next) { | |
4479 | /* Remove last page from this bio */ | |
4480 | bio2->bi_vcnt--; | |
4481 | bio2->bi_size -= len; | |
4482 | bio2->bi_flags &= ~(1<<BIO_SEG_VALID); | |
4483 | } | |
4484 | goto bio_full; | |
4485 | } | |
4486 | sector_nr += len >> 9; | |
4487 | nr_sectors += len >> 9; | |
4488 | } | |
4489 | bio_full: | |
4490 | r10_bio->sectors = nr_sectors; | |
4491 | ||
4492 | /* Now submit the read */ | |
4493 | md_sync_acct(read_bio->bi_bdev, r10_bio->sectors); | |
4494 | atomic_inc(&r10_bio->remaining); | |
4495 | read_bio->bi_next = NULL; | |
4496 | generic_make_request(read_bio); | |
4497 | sector_nr += nr_sectors; | |
4498 | sectors_done += nr_sectors; | |
4499 | if (sector_nr <= last) | |
4500 | goto read_more; | |
4501 | ||
4502 | /* Now that we have done the whole section we can | |
4503 | * update reshape_progress | |
4504 | */ | |
4505 | if (mddev->reshape_backwards) | |
4506 | conf->reshape_progress -= sectors_done; | |
4507 | else | |
4508 | conf->reshape_progress += sectors_done; | |
4509 | ||
4510 | return sectors_done; | |
4511 | } | |
4512 | ||
4513 | static void end_reshape_request(struct r10bio *r10_bio); | |
4514 | static int handle_reshape_read_error(struct mddev *mddev, | |
4515 | struct r10bio *r10_bio); | |
4516 | static void reshape_request_write(struct mddev *mddev, struct r10bio *r10_bio) | |
4517 | { | |
4518 | /* Reshape read completed. Hopefully we have a block | |
4519 | * to write out. | |
4520 | * If we got a read error then we do sync 1-page reads from | |
4521 | * elsewhere until we find the data - or give up. | |
4522 | */ | |
4523 | struct r10conf *conf = mddev->private; | |
4524 | int s; | |
4525 | ||
4526 | if (!test_bit(R10BIO_Uptodate, &r10_bio->state)) | |
4527 | if (handle_reshape_read_error(mddev, r10_bio) < 0) { | |
4528 | /* Reshape has been aborted */ | |
4529 | md_done_sync(mddev, r10_bio->sectors, 0); | |
4530 | return; | |
4531 | } | |
4532 | ||
4533 | /* We definitely have the data in the pages, schedule the | |
4534 | * writes. | |
4535 | */ | |
4536 | atomic_set(&r10_bio->remaining, 1); | |
4537 | for (s = 0; s < conf->copies*2; s++) { | |
4538 | struct bio *b; | |
4539 | int d = r10_bio->devs[s/2].devnum; | |
4540 | struct md_rdev *rdev; | |
4541 | if (s&1) { | |
4542 | rdev = conf->mirrors[d].replacement; | |
4543 | b = r10_bio->devs[s/2].repl_bio; | |
4544 | } else { | |
4545 | rdev = conf->mirrors[d].rdev; | |
4546 | b = r10_bio->devs[s/2].bio; | |
4547 | } | |
4548 | if (!rdev || test_bit(Faulty, &rdev->flags)) | |
4549 | continue; | |
4550 | atomic_inc(&rdev->nr_pending); | |
4551 | md_sync_acct(b->bi_bdev, r10_bio->sectors); | |
4552 | atomic_inc(&r10_bio->remaining); | |
4553 | b->bi_next = NULL; | |
4554 | generic_make_request(b); | |
4555 | } | |
4556 | end_reshape_request(r10_bio); | |
4557 | } | |
4558 | ||
4559 | static void end_reshape(struct r10conf *conf) | |
4560 | { | |
4561 | if (test_bit(MD_RECOVERY_INTR, &conf->mddev->recovery)) | |
4562 | return; | |
4563 | ||
4564 | spin_lock_irq(&conf->device_lock); | |
4565 | conf->prev = conf->geo; | |
4566 | md_finish_reshape(conf->mddev); | |
4567 | smp_wmb(); | |
4568 | conf->reshape_progress = MaxSector; | |
4569 | spin_unlock_irq(&conf->device_lock); | |
4570 | ||
4571 | /* read-ahead size must cover two whole stripes, which is | |
4572 | * 2 * (datadisks) * chunksize where 'n' is the number of raid devices | |
4573 | */ | |
4574 | if (conf->mddev->queue) { | |
4575 | int stripe = conf->geo.raid_disks * | |
4576 | ((conf->mddev->chunk_sectors << 9) / PAGE_SIZE); | |
4577 | stripe /= conf->geo.near_copies; | |
4578 | if (conf->mddev->queue->backing_dev_info.ra_pages < 2 * stripe) | |
4579 | conf->mddev->queue->backing_dev_info.ra_pages = 2 * stripe; | |
4580 | } | |
4581 | conf->fullsync = 0; | |
4582 | } | |
4583 | ||
4584 | ||
4585 | static int handle_reshape_read_error(struct mddev *mddev, | |
4586 | struct r10bio *r10_bio) | |
4587 | { | |
4588 | /* Use sync reads to get the blocks from somewhere else */ | |
4589 | int sectors = r10_bio->sectors; | |
3ea7daa5 | 4590 | struct r10conf *conf = mddev->private; |
e0ee7785 N |
4591 | struct { |
4592 | struct r10bio r10_bio; | |
4593 | struct r10dev devs[conf->copies]; | |
4594 | } on_stack; | |
4595 | struct r10bio *r10b = &on_stack.r10_bio; | |
3ea7daa5 N |
4596 | int slot = 0; |
4597 | int idx = 0; | |
4598 | struct bio_vec *bvec = r10_bio->master_bio->bi_io_vec; | |
4599 | ||
e0ee7785 N |
4600 | r10b->sector = r10_bio->sector; |
4601 | __raid10_find_phys(&conf->prev, r10b); | |
3ea7daa5 N |
4602 | |
4603 | while (sectors) { | |
4604 | int s = sectors; | |
4605 | int success = 0; | |
4606 | int first_slot = slot; | |
4607 | ||
4608 | if (s > (PAGE_SIZE >> 9)) | |
4609 | s = PAGE_SIZE >> 9; | |
4610 | ||
4611 | while (!success) { | |
e0ee7785 | 4612 | int d = r10b->devs[slot].devnum; |
3ea7daa5 N |
4613 | struct md_rdev *rdev = conf->mirrors[d].rdev; |
4614 | sector_t addr; | |
4615 | if (rdev == NULL || | |
4616 | test_bit(Faulty, &rdev->flags) || | |
4617 | !test_bit(In_sync, &rdev->flags)) | |
4618 | goto failed; | |
4619 | ||
e0ee7785 | 4620 | addr = r10b->devs[slot].addr + idx * PAGE_SIZE; |
3ea7daa5 N |
4621 | success = sync_page_io(rdev, |
4622 | addr, | |
4623 | s << 9, | |
4624 | bvec[idx].bv_page, | |
4625 | READ, false); | |
4626 | if (success) | |
4627 | break; | |
4628 | failed: | |
4629 | slot++; | |
4630 | if (slot >= conf->copies) | |
4631 | slot = 0; | |
4632 | if (slot == first_slot) | |
4633 | break; | |
4634 | } | |
4635 | if (!success) { | |
4636 | /* couldn't read this block, must give up */ | |
4637 | set_bit(MD_RECOVERY_INTR, | |
4638 | &mddev->recovery); | |
4639 | return -EIO; | |
4640 | } | |
4641 | sectors -= s; | |
4642 | idx++; | |
4643 | } | |
4644 | return 0; | |
4645 | } | |
4646 | ||
4647 | static void end_reshape_write(struct bio *bio, int error) | |
4648 | { | |
4649 | int uptodate = test_bit(BIO_UPTODATE, &bio->bi_flags); | |
4650 | struct r10bio *r10_bio = bio->bi_private; | |
4651 | struct mddev *mddev = r10_bio->mddev; | |
4652 | struct r10conf *conf = mddev->private; | |
4653 | int d; | |
4654 | int slot; | |
4655 | int repl; | |
4656 | struct md_rdev *rdev = NULL; | |
4657 | ||
4658 | d = find_bio_disk(conf, r10_bio, bio, &slot, &repl); | |
4659 | if (repl) | |
4660 | rdev = conf->mirrors[d].replacement; | |
4661 | if (!rdev) { | |
4662 | smp_mb(); | |
4663 | rdev = conf->mirrors[d].rdev; | |
4664 | } | |
4665 | ||
4666 | if (!uptodate) { | |
4667 | /* FIXME should record badblock */ | |
4668 | md_error(mddev, rdev); | |
4669 | } | |
4670 | ||
4671 | rdev_dec_pending(rdev, mddev); | |
4672 | end_reshape_request(r10_bio); | |
4673 | } | |
4674 | ||
4675 | static void end_reshape_request(struct r10bio *r10_bio) | |
4676 | { | |
4677 | if (!atomic_dec_and_test(&r10_bio->remaining)) | |
4678 | return; | |
4679 | md_done_sync(r10_bio->mddev, r10_bio->sectors, 1); | |
4680 | bio_put(r10_bio->master_bio); | |
4681 | put_buf(r10_bio); | |
4682 | } | |
4683 | ||
4684 | static void raid10_finish_reshape(struct mddev *mddev) | |
4685 | { | |
4686 | struct r10conf *conf = mddev->private; | |
4687 | ||
4688 | if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) | |
4689 | return; | |
4690 | ||
4691 | if (mddev->delta_disks > 0) { | |
4692 | sector_t size = raid10_size(mddev, 0, 0); | |
4693 | md_set_array_sectors(mddev, size); | |
4694 | if (mddev->recovery_cp > mddev->resync_max_sectors) { | |
4695 | mddev->recovery_cp = mddev->resync_max_sectors; | |
4696 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
4697 | } | |
4698 | mddev->resync_max_sectors = size; | |
4699 | set_capacity(mddev->gendisk, mddev->array_sectors); | |
4700 | revalidate_disk(mddev->gendisk); | |
63aced61 N |
4701 | } else { |
4702 | int d; | |
4703 | for (d = conf->geo.raid_disks ; | |
4704 | d < conf->geo.raid_disks - mddev->delta_disks; | |
4705 | d++) { | |
4706 | struct md_rdev *rdev = conf->mirrors[d].rdev; | |
4707 | if (rdev) | |
4708 | clear_bit(In_sync, &rdev->flags); | |
4709 | rdev = conf->mirrors[d].replacement; | |
4710 | if (rdev) | |
4711 | clear_bit(In_sync, &rdev->flags); | |
4712 | } | |
3ea7daa5 N |
4713 | } |
4714 | mddev->layout = mddev->new_layout; | |
4715 | mddev->chunk_sectors = 1 << conf->geo.chunk_shift; | |
4716 | mddev->reshape_position = MaxSector; | |
4717 | mddev->delta_disks = 0; | |
4718 | mddev->reshape_backwards = 0; | |
4719 | } | |
4720 | ||
84fc4b56 | 4721 | static struct md_personality raid10_personality = |
1da177e4 LT |
4722 | { |
4723 | .name = "raid10", | |
2604b703 | 4724 | .level = 10, |
1da177e4 LT |
4725 | .owner = THIS_MODULE, |
4726 | .make_request = make_request, | |
4727 | .run = run, | |
4728 | .stop = stop, | |
4729 | .status = status, | |
4730 | .error_handler = error, | |
4731 | .hot_add_disk = raid10_add_disk, | |
4732 | .hot_remove_disk= raid10_remove_disk, | |
4733 | .spare_active = raid10_spare_active, | |
4734 | .sync_request = sync_request, | |
6cce3b23 | 4735 | .quiesce = raid10_quiesce, |
80c3a6ce | 4736 | .size = raid10_size, |
006a09a0 | 4737 | .resize = raid10_resize, |
dab8b292 | 4738 | .takeover = raid10_takeover, |
3ea7daa5 N |
4739 | .check_reshape = raid10_check_reshape, |
4740 | .start_reshape = raid10_start_reshape, | |
4741 | .finish_reshape = raid10_finish_reshape, | |
1da177e4 LT |
4742 | }; |
4743 | ||
4744 | static int __init raid_init(void) | |
4745 | { | |
2604b703 | 4746 | return register_md_personality(&raid10_personality); |
1da177e4 LT |
4747 | } |
4748 | ||
4749 | static void raid_exit(void) | |
4750 | { | |
2604b703 | 4751 | unregister_md_personality(&raid10_personality); |
1da177e4 LT |
4752 | } |
4753 | ||
4754 | module_init(raid_init); | |
4755 | module_exit(raid_exit); | |
4756 | MODULE_LICENSE("GPL"); | |
0efb9e61 | 4757 | MODULE_DESCRIPTION("RAID10 (striped mirror) personality for MD"); |
1da177e4 | 4758 | MODULE_ALIAS("md-personality-9"); /* RAID10 */ |
d9d166c2 | 4759 | MODULE_ALIAS("md-raid10"); |
2604b703 | 4760 | MODULE_ALIAS("md-level-10"); |
34db0cd6 N |
4761 | |
4762 | module_param(max_queued_requests, int, S_IRUGO|S_IWUSR); |