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f6bed0ef SL |
1 | /* |
2 | * Copyright (C) 2015 Shaohua Li <shli@fb.com> | |
b4c625c6 | 3 | * Copyright (C) 2016 Song Liu <songliubraving@fb.com> |
f6bed0ef SL |
4 | * |
5 | * This program is free software; you can redistribute it and/or modify it | |
6 | * under the terms and conditions of the GNU General Public License, | |
7 | * version 2, as published by the Free Software Foundation. | |
8 | * | |
9 | * This program is distributed in the hope it will be useful, but WITHOUT | |
10 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for | |
12 | * more details. | |
13 | * | |
14 | */ | |
15 | #include <linux/kernel.h> | |
16 | #include <linux/wait.h> | |
17 | #include <linux/blkdev.h> | |
18 | #include <linux/slab.h> | |
19 | #include <linux/raid/md_p.h> | |
5cb2fbd6 | 20 | #include <linux/crc32c.h> |
f6bed0ef | 21 | #include <linux/random.h> |
ce1ccd07 | 22 | #include <linux/kthread.h> |
03b047f4 | 23 | #include <linux/types.h> |
f6bed0ef SL |
24 | #include "md.h" |
25 | #include "raid5.h" | |
935fe098 | 26 | #include "md-bitmap.h" |
70d466f7 | 27 | #include "raid5-log.h" |
f6bed0ef SL |
28 | |
29 | /* | |
30 | * metadata/data stored in disk with 4k size unit (a block) regardless | |
31 | * underneath hardware sector size. only works with PAGE_SIZE == 4096 | |
32 | */ | |
33 | #define BLOCK_SECTORS (8) | |
effe6ee7 | 34 | #define BLOCK_SECTOR_SHIFT (3) |
f6bed0ef | 35 | |
0576b1c6 | 36 | /* |
a39f7afd SL |
37 | * log->max_free_space is min(1/4 disk size, 10G reclaimable space). |
38 | * | |
39 | * In write through mode, the reclaim runs every log->max_free_space. | |
40 | * This can prevent the recovery scans for too long | |
0576b1c6 SL |
41 | */ |
42 | #define RECLAIM_MAX_FREE_SPACE (10 * 1024 * 1024 * 2) /* sector */ | |
43 | #define RECLAIM_MAX_FREE_SPACE_SHIFT (2) | |
44 | ||
a39f7afd SL |
45 | /* wake up reclaim thread periodically */ |
46 | #define R5C_RECLAIM_WAKEUP_INTERVAL (30 * HZ) | |
47 | /* start flush with these full stripes */ | |
84890c03 | 48 | #define R5C_FULL_STRIPE_FLUSH_BATCH(conf) (conf->max_nr_stripes / 4) |
a39f7afd SL |
49 | /* reclaim stripes in groups */ |
50 | #define R5C_RECLAIM_STRIPE_GROUP (NR_STRIPE_HASH_LOCKS * 2) | |
51 | ||
c38d29b3 CH |
52 | /* |
53 | * We only need 2 bios per I/O unit to make progress, but ensure we | |
54 | * have a few more available to not get too tight. | |
55 | */ | |
56 | #define R5L_POOL_SIZE 4 | |
57 | ||
2c7da14b SL |
58 | static char *r5c_journal_mode_str[] = {"write-through", |
59 | "write-back"}; | |
2ded3703 SL |
60 | /* |
61 | * raid5 cache state machine | |
62 | * | |
9b69173e | 63 | * With the RAID cache, each stripe works in two phases: |
2ded3703 SL |
64 | * - caching phase |
65 | * - writing-out phase | |
66 | * | |
67 | * These two phases are controlled by bit STRIPE_R5C_CACHING: | |
68 | * if STRIPE_R5C_CACHING == 0, the stripe is in writing-out phase | |
69 | * if STRIPE_R5C_CACHING == 1, the stripe is in caching phase | |
70 | * | |
71 | * When there is no journal, or the journal is in write-through mode, | |
72 | * the stripe is always in writing-out phase. | |
73 | * | |
74 | * For write-back journal, the stripe is sent to caching phase on write | |
75 | * (r5c_try_caching_write). r5c_make_stripe_write_out() kicks off | |
76 | * the write-out phase by clearing STRIPE_R5C_CACHING. | |
77 | * | |
78 | * Stripes in caching phase do not write the raid disks. Instead, all | |
79 | * writes are committed from the log device. Therefore, a stripe in | |
80 | * caching phase handles writes as: | |
81 | * - write to log device | |
82 | * - return IO | |
83 | * | |
84 | * Stripes in writing-out phase handle writes as: | |
85 | * - calculate parity | |
86 | * - write pending data and parity to journal | |
87 | * - write data and parity to raid disks | |
88 | * - return IO for pending writes | |
89 | */ | |
90 | ||
f6bed0ef SL |
91 | struct r5l_log { |
92 | struct md_rdev *rdev; | |
93 | ||
94 | u32 uuid_checksum; | |
95 | ||
96 | sector_t device_size; /* log device size, round to | |
97 | * BLOCK_SECTORS */ | |
0576b1c6 SL |
98 | sector_t max_free_space; /* reclaim run if free space is at |
99 | * this size */ | |
f6bed0ef SL |
100 | |
101 | sector_t last_checkpoint; /* log tail. where recovery scan | |
102 | * starts from */ | |
103 | u64 last_cp_seq; /* log tail sequence */ | |
104 | ||
105 | sector_t log_start; /* log head. where new data appends */ | |
106 | u64 seq; /* log head sequence */ | |
107 | ||
17036461 | 108 | sector_t next_checkpoint; |
17036461 | 109 | |
f6bed0ef SL |
110 | struct mutex io_mutex; |
111 | struct r5l_io_unit *current_io; /* current io_unit accepting new data */ | |
112 | ||
113 | spinlock_t io_list_lock; | |
114 | struct list_head running_ios; /* io_units which are still running, | |
115 | * and have not yet been completely | |
116 | * written to the log */ | |
117 | struct list_head io_end_ios; /* io_units which have been completely | |
118 | * written to the log but not yet written | |
119 | * to the RAID */ | |
a8c34f91 SL |
120 | struct list_head flushing_ios; /* io_units which are waiting for log |
121 | * cache flush */ | |
04732f74 | 122 | struct list_head finished_ios; /* io_units which settle down in log disk */ |
a8c34f91 | 123 | struct bio flush_bio; |
f6bed0ef | 124 | |
5036c390 CH |
125 | struct list_head no_mem_stripes; /* pending stripes, -ENOMEM */ |
126 | ||
f6bed0ef | 127 | struct kmem_cache *io_kc; |
5036c390 | 128 | mempool_t *io_pool; |
c38d29b3 | 129 | struct bio_set *bs; |
e8deb638 | 130 | mempool_t *meta_pool; |
f6bed0ef | 131 | |
0576b1c6 SL |
132 | struct md_thread *reclaim_thread; |
133 | unsigned long reclaim_target; /* number of space that need to be | |
134 | * reclaimed. if it's 0, reclaim spaces | |
135 | * used by io_units which are in | |
136 | * IO_UNIT_STRIPE_END state (eg, reclaim | |
137 | * dones't wait for specific io_unit | |
138 | * switching to IO_UNIT_STRIPE_END | |
139 | * state) */ | |
0fd22b45 | 140 | wait_queue_head_t iounit_wait; |
0576b1c6 | 141 | |
f6bed0ef SL |
142 | struct list_head no_space_stripes; /* pending stripes, log has no space */ |
143 | spinlock_t no_space_stripes_lock; | |
56fef7c6 CH |
144 | |
145 | bool need_cache_flush; | |
2ded3703 SL |
146 | |
147 | /* for r5c_cache */ | |
148 | enum r5c_journal_mode r5c_journal_mode; | |
a39f7afd SL |
149 | |
150 | /* all stripes in r5cache, in the order of seq at sh->log_start */ | |
151 | struct list_head stripe_in_journal_list; | |
152 | ||
153 | spinlock_t stripe_in_journal_lock; | |
154 | atomic_t stripe_in_journal_count; | |
3bddb7f8 SL |
155 | |
156 | /* to submit async io_units, to fulfill ordering of flush */ | |
157 | struct work_struct deferred_io_work; | |
2e38a37f SL |
158 | /* to disable write back during in degraded mode */ |
159 | struct work_struct disable_writeback_work; | |
03b047f4 SL |
160 | |
161 | /* to for chunk_aligned_read in writeback mode, details below */ | |
162 | spinlock_t tree_lock; | |
163 | struct radix_tree_root big_stripe_tree; | |
f6bed0ef SL |
164 | }; |
165 | ||
03b047f4 SL |
166 | /* |
167 | * Enable chunk_aligned_read() with write back cache. | |
168 | * | |
169 | * Each chunk may contain more than one stripe (for example, a 256kB | |
170 | * chunk contains 64 4kB-page, so this chunk contain 64 stripes). For | |
171 | * chunk_aligned_read, these stripes are grouped into one "big_stripe". | |
172 | * For each big_stripe, we count how many stripes of this big_stripe | |
173 | * are in the write back cache. These data are tracked in a radix tree | |
174 | * (big_stripe_tree). We use radix_tree item pointer as the counter. | |
175 | * r5c_tree_index() is used to calculate keys for the radix tree. | |
176 | * | |
177 | * chunk_aligned_read() calls r5c_big_stripe_cached() to look up | |
178 | * big_stripe of each chunk in the tree. If this big_stripe is in the | |
179 | * tree, chunk_aligned_read() aborts. This look up is protected by | |
180 | * rcu_read_lock(). | |
181 | * | |
182 | * It is necessary to remember whether a stripe is counted in | |
183 | * big_stripe_tree. Instead of adding new flag, we reuses existing flags: | |
184 | * STRIPE_R5C_PARTIAL_STRIPE and STRIPE_R5C_FULL_STRIPE. If either of these | |
185 | * two flags are set, the stripe is counted in big_stripe_tree. This | |
186 | * requires moving set_bit(STRIPE_R5C_PARTIAL_STRIPE) to | |
187 | * r5c_try_caching_write(); and moving clear_bit of | |
188 | * STRIPE_R5C_PARTIAL_STRIPE and STRIPE_R5C_FULL_STRIPE to | |
189 | * r5c_finish_stripe_write_out(). | |
190 | */ | |
191 | ||
192 | /* | |
193 | * radix tree requests lowest 2 bits of data pointer to be 2b'00. | |
194 | * So it is necessary to left shift the counter by 2 bits before using it | |
195 | * as data pointer of the tree. | |
196 | */ | |
197 | #define R5C_RADIX_COUNT_SHIFT 2 | |
198 | ||
199 | /* | |
200 | * calculate key for big_stripe_tree | |
201 | * | |
202 | * sect: align_bi->bi_iter.bi_sector or sh->sector | |
203 | */ | |
204 | static inline sector_t r5c_tree_index(struct r5conf *conf, | |
205 | sector_t sect) | |
206 | { | |
207 | sector_t offset; | |
208 | ||
209 | offset = sector_div(sect, conf->chunk_sectors); | |
210 | return sect; | |
211 | } | |
212 | ||
f6bed0ef SL |
213 | /* |
214 | * an IO range starts from a meta data block and end at the next meta data | |
215 | * block. The io unit's the meta data block tracks data/parity followed it. io | |
216 | * unit is written to log disk with normal write, as we always flush log disk | |
217 | * first and then start move data to raid disks, there is no requirement to | |
218 | * write io unit with FLUSH/FUA | |
219 | */ | |
220 | struct r5l_io_unit { | |
221 | struct r5l_log *log; | |
222 | ||
223 | struct page *meta_page; /* store meta block */ | |
224 | int meta_offset; /* current offset in meta_page */ | |
225 | ||
f6bed0ef SL |
226 | struct bio *current_bio;/* current_bio accepting new data */ |
227 | ||
228 | atomic_t pending_stripe;/* how many stripes not flushed to raid */ | |
229 | u64 seq; /* seq number of the metablock */ | |
230 | sector_t log_start; /* where the io_unit starts */ | |
231 | sector_t log_end; /* where the io_unit ends */ | |
232 | struct list_head log_sibling; /* log->running_ios */ | |
233 | struct list_head stripe_list; /* stripes added to the io_unit */ | |
234 | ||
235 | int state; | |
6143e2ce | 236 | bool need_split_bio; |
3bddb7f8 SL |
237 | struct bio *split_bio; |
238 | ||
a9501d74 SL |
239 | unsigned int has_flush:1; /* include flush request */ |
240 | unsigned int has_fua:1; /* include fua request */ | |
241 | unsigned int has_null_flush:1; /* include null flush request */ | |
242 | unsigned int has_flush_payload:1; /* include flush payload */ | |
3bddb7f8 SL |
243 | /* |
244 | * io isn't sent yet, flush/fua request can only be submitted till it's | |
245 | * the first IO in running_ios list | |
246 | */ | |
247 | unsigned int io_deferred:1; | |
248 | ||
249 | struct bio_list flush_barriers; /* size == 0 flush bios */ | |
f6bed0ef SL |
250 | }; |
251 | ||
252 | /* r5l_io_unit state */ | |
253 | enum r5l_io_unit_state { | |
254 | IO_UNIT_RUNNING = 0, /* accepting new IO */ | |
255 | IO_UNIT_IO_START = 1, /* io_unit bio start writing to log, | |
256 | * don't accepting new bio */ | |
257 | IO_UNIT_IO_END = 2, /* io_unit bio finish writing to log */ | |
a8c34f91 | 258 | IO_UNIT_STRIPE_END = 3, /* stripes data finished writing to raid */ |
f6bed0ef SL |
259 | }; |
260 | ||
2ded3703 SL |
261 | bool r5c_is_writeback(struct r5l_log *log) |
262 | { | |
263 | return (log != NULL && | |
264 | log->r5c_journal_mode == R5C_JOURNAL_MODE_WRITE_BACK); | |
265 | } | |
266 | ||
f6bed0ef SL |
267 | static sector_t r5l_ring_add(struct r5l_log *log, sector_t start, sector_t inc) |
268 | { | |
269 | start += inc; | |
270 | if (start >= log->device_size) | |
271 | start = start - log->device_size; | |
272 | return start; | |
273 | } | |
274 | ||
275 | static sector_t r5l_ring_distance(struct r5l_log *log, sector_t start, | |
276 | sector_t end) | |
277 | { | |
278 | if (end >= start) | |
279 | return end - start; | |
280 | else | |
281 | return end + log->device_size - start; | |
282 | } | |
283 | ||
284 | static bool r5l_has_free_space(struct r5l_log *log, sector_t size) | |
285 | { | |
286 | sector_t used_size; | |
287 | ||
288 | used_size = r5l_ring_distance(log, log->last_checkpoint, | |
289 | log->log_start); | |
290 | ||
291 | return log->device_size > used_size + size; | |
292 | } | |
293 | ||
f6bed0ef SL |
294 | static void __r5l_set_io_unit_state(struct r5l_io_unit *io, |
295 | enum r5l_io_unit_state state) | |
296 | { | |
f6bed0ef SL |
297 | if (WARN_ON(io->state >= state)) |
298 | return; | |
299 | io->state = state; | |
f6bed0ef SL |
300 | } |
301 | ||
1e6d690b | 302 | static void |
bd83d0a2 | 303 | r5c_return_dev_pending_writes(struct r5conf *conf, struct r5dev *dev) |
1e6d690b SL |
304 | { |
305 | struct bio *wbi, *wbi2; | |
306 | ||
307 | wbi = dev->written; | |
308 | dev->written = NULL; | |
309 | while (wbi && wbi->bi_iter.bi_sector < | |
310 | dev->sector + STRIPE_SECTORS) { | |
311 | wbi2 = r5_next_bio(wbi, dev->sector); | |
49728050 | 312 | md_write_end(conf->mddev); |
016c76ac | 313 | bio_endio(wbi); |
1e6d690b SL |
314 | wbi = wbi2; |
315 | } | |
316 | } | |
317 | ||
318 | void r5c_handle_cached_data_endio(struct r5conf *conf, | |
bd83d0a2 | 319 | struct stripe_head *sh, int disks) |
1e6d690b SL |
320 | { |
321 | int i; | |
322 | ||
323 | for (i = sh->disks; i--; ) { | |
324 | if (sh->dev[i].written) { | |
325 | set_bit(R5_UPTODATE, &sh->dev[i].flags); | |
bd83d0a2 | 326 | r5c_return_dev_pending_writes(conf, &sh->dev[i]); |
1e6d690b SL |
327 | bitmap_endwrite(conf->mddev->bitmap, sh->sector, |
328 | STRIPE_SECTORS, | |
329 | !test_bit(STRIPE_DEGRADED, &sh->state), | |
330 | 0); | |
331 | } | |
332 | } | |
333 | } | |
334 | ||
ff875738 AP |
335 | void r5l_wake_reclaim(struct r5l_log *log, sector_t space); |
336 | ||
a39f7afd SL |
337 | /* Check whether we should flush some stripes to free up stripe cache */ |
338 | void r5c_check_stripe_cache_usage(struct r5conf *conf) | |
339 | { | |
340 | int total_cached; | |
341 | ||
342 | if (!r5c_is_writeback(conf->log)) | |
343 | return; | |
344 | ||
345 | total_cached = atomic_read(&conf->r5c_cached_partial_stripes) + | |
346 | atomic_read(&conf->r5c_cached_full_stripes); | |
347 | ||
348 | /* | |
349 | * The following condition is true for either of the following: | |
350 | * - stripe cache pressure high: | |
351 | * total_cached > 3/4 min_nr_stripes || | |
352 | * empty_inactive_list_nr > 0 | |
353 | * - stripe cache pressure moderate: | |
354 | * total_cached > 1/2 min_nr_stripes | |
355 | */ | |
356 | if (total_cached > conf->min_nr_stripes * 1 / 2 || | |
357 | atomic_read(&conf->empty_inactive_list_nr) > 0) | |
358 | r5l_wake_reclaim(conf->log, 0); | |
359 | } | |
360 | ||
361 | /* | |
362 | * flush cache when there are R5C_FULL_STRIPE_FLUSH_BATCH or more full | |
363 | * stripes in the cache | |
364 | */ | |
365 | void r5c_check_cached_full_stripe(struct r5conf *conf) | |
366 | { | |
367 | if (!r5c_is_writeback(conf->log)) | |
368 | return; | |
369 | ||
370 | /* | |
371 | * wake up reclaim for R5C_FULL_STRIPE_FLUSH_BATCH cached stripes | |
372 | * or a full stripe (chunk size / 4k stripes). | |
373 | */ | |
374 | if (atomic_read(&conf->r5c_cached_full_stripes) >= | |
84890c03 | 375 | min(R5C_FULL_STRIPE_FLUSH_BATCH(conf), |
a39f7afd SL |
376 | conf->chunk_sectors >> STRIPE_SHIFT)) |
377 | r5l_wake_reclaim(conf->log, 0); | |
378 | } | |
379 | ||
380 | /* | |
381 | * Total log space (in sectors) needed to flush all data in cache | |
382 | * | |
39b99586 SL |
383 | * To avoid deadlock due to log space, it is necessary to reserve log |
384 | * space to flush critical stripes (stripes that occupying log space near | |
385 | * last_checkpoint). This function helps check how much log space is | |
386 | * required to flush all cached stripes. | |
a39f7afd | 387 | * |
39b99586 SL |
388 | * To reduce log space requirements, two mechanisms are used to give cache |
389 | * flush higher priorities: | |
390 | * 1. In handle_stripe_dirtying() and schedule_reconstruction(), | |
391 | * stripes ALREADY in journal can be flushed w/o pending writes; | |
392 | * 2. In r5l_write_stripe() and r5c_cache_data(), stripes NOT in journal | |
393 | * can be delayed (r5l_add_no_space_stripe). | |
a39f7afd | 394 | * |
39b99586 SL |
395 | * In cache flush, the stripe goes through 1 and then 2. For a stripe that |
396 | * already passed 1, flushing it requires at most (conf->max_degraded + 1) | |
397 | * pages of journal space. For stripes that has not passed 1, flushing it | |
398 | * requires (conf->raid_disks + 1) pages of journal space. There are at | |
399 | * most (conf->group_cnt + 1) stripe that passed 1. So total journal space | |
400 | * required to flush all cached stripes (in pages) is: | |
401 | * | |
402 | * (stripe_in_journal_count - group_cnt - 1) * (max_degraded + 1) + | |
403 | * (group_cnt + 1) * (raid_disks + 1) | |
404 | * or | |
405 | * (stripe_in_journal_count) * (max_degraded + 1) + | |
406 | * (group_cnt + 1) * (raid_disks - max_degraded) | |
a39f7afd SL |
407 | */ |
408 | static sector_t r5c_log_required_to_flush_cache(struct r5conf *conf) | |
409 | { | |
410 | struct r5l_log *log = conf->log; | |
411 | ||
412 | if (!r5c_is_writeback(log)) | |
413 | return 0; | |
414 | ||
39b99586 SL |
415 | return BLOCK_SECTORS * |
416 | ((conf->max_degraded + 1) * atomic_read(&log->stripe_in_journal_count) + | |
417 | (conf->raid_disks - conf->max_degraded) * (conf->group_cnt + 1)); | |
a39f7afd SL |
418 | } |
419 | ||
420 | /* | |
421 | * evaluate log space usage and update R5C_LOG_TIGHT and R5C_LOG_CRITICAL | |
422 | * | |
423 | * R5C_LOG_TIGHT is set when free space on the log device is less than 3x of | |
424 | * reclaim_required_space. R5C_LOG_CRITICAL is set when free space on the log | |
425 | * device is less than 2x of reclaim_required_space. | |
426 | */ | |
427 | static inline void r5c_update_log_state(struct r5l_log *log) | |
428 | { | |
429 | struct r5conf *conf = log->rdev->mddev->private; | |
430 | sector_t free_space; | |
431 | sector_t reclaim_space; | |
f687a33e | 432 | bool wake_reclaim = false; |
a39f7afd SL |
433 | |
434 | if (!r5c_is_writeback(log)) | |
435 | return; | |
436 | ||
437 | free_space = r5l_ring_distance(log, log->log_start, | |
438 | log->last_checkpoint); | |
439 | reclaim_space = r5c_log_required_to_flush_cache(conf); | |
440 | if (free_space < 2 * reclaim_space) | |
441 | set_bit(R5C_LOG_CRITICAL, &conf->cache_state); | |
f687a33e SL |
442 | else { |
443 | if (test_bit(R5C_LOG_CRITICAL, &conf->cache_state)) | |
444 | wake_reclaim = true; | |
a39f7afd | 445 | clear_bit(R5C_LOG_CRITICAL, &conf->cache_state); |
f687a33e | 446 | } |
a39f7afd SL |
447 | if (free_space < 3 * reclaim_space) |
448 | set_bit(R5C_LOG_TIGHT, &conf->cache_state); | |
449 | else | |
450 | clear_bit(R5C_LOG_TIGHT, &conf->cache_state); | |
f687a33e SL |
451 | |
452 | if (wake_reclaim) | |
453 | r5l_wake_reclaim(log, 0); | |
a39f7afd SL |
454 | } |
455 | ||
2ded3703 SL |
456 | /* |
457 | * Put the stripe into writing-out phase by clearing STRIPE_R5C_CACHING. | |
458 | * This function should only be called in write-back mode. | |
459 | */ | |
a39f7afd | 460 | void r5c_make_stripe_write_out(struct stripe_head *sh) |
2ded3703 SL |
461 | { |
462 | struct r5conf *conf = sh->raid_conf; | |
463 | struct r5l_log *log = conf->log; | |
464 | ||
465 | BUG_ON(!r5c_is_writeback(log)); | |
466 | ||
467 | WARN_ON(!test_bit(STRIPE_R5C_CACHING, &sh->state)); | |
468 | clear_bit(STRIPE_R5C_CACHING, &sh->state); | |
1e6d690b SL |
469 | |
470 | if (!test_and_set_bit(STRIPE_PREREAD_ACTIVE, &sh->state)) | |
471 | atomic_inc(&conf->preread_active_stripes); | |
1e6d690b SL |
472 | } |
473 | ||
474 | static void r5c_handle_data_cached(struct stripe_head *sh) | |
475 | { | |
476 | int i; | |
477 | ||
478 | for (i = sh->disks; i--; ) | |
479 | if (test_and_clear_bit(R5_Wantwrite, &sh->dev[i].flags)) { | |
480 | set_bit(R5_InJournal, &sh->dev[i].flags); | |
481 | clear_bit(R5_LOCKED, &sh->dev[i].flags); | |
482 | } | |
483 | clear_bit(STRIPE_LOG_TRAPPED, &sh->state); | |
484 | } | |
485 | ||
486 | /* | |
487 | * this journal write must contain full parity, | |
488 | * it may also contain some data pages | |
489 | */ | |
490 | static void r5c_handle_parity_cached(struct stripe_head *sh) | |
491 | { | |
492 | int i; | |
493 | ||
494 | for (i = sh->disks; i--; ) | |
495 | if (test_bit(R5_InJournal, &sh->dev[i].flags)) | |
496 | set_bit(R5_Wantwrite, &sh->dev[i].flags); | |
2ded3703 SL |
497 | } |
498 | ||
499 | /* | |
500 | * Setting proper flags after writing (or flushing) data and/or parity to the | |
501 | * log device. This is called from r5l_log_endio() or r5l_log_flush_endio(). | |
502 | */ | |
503 | static void r5c_finish_cache_stripe(struct stripe_head *sh) | |
504 | { | |
505 | struct r5l_log *log = sh->raid_conf->log; | |
506 | ||
507 | if (log->r5c_journal_mode == R5C_JOURNAL_MODE_WRITE_THROUGH) { | |
508 | BUG_ON(test_bit(STRIPE_R5C_CACHING, &sh->state)); | |
509 | /* | |
510 | * Set R5_InJournal for parity dev[pd_idx]. This means | |
511 | * all data AND parity in the journal. For RAID 6, it is | |
512 | * NOT necessary to set the flag for dev[qd_idx], as the | |
513 | * two parities are written out together. | |
514 | */ | |
515 | set_bit(R5_InJournal, &sh->dev[sh->pd_idx].flags); | |
1e6d690b SL |
516 | } else if (test_bit(STRIPE_R5C_CACHING, &sh->state)) { |
517 | r5c_handle_data_cached(sh); | |
518 | } else { | |
519 | r5c_handle_parity_cached(sh); | |
520 | set_bit(R5_InJournal, &sh->dev[sh->pd_idx].flags); | |
521 | } | |
2ded3703 SL |
522 | } |
523 | ||
d8858f43 CH |
524 | static void r5l_io_run_stripes(struct r5l_io_unit *io) |
525 | { | |
526 | struct stripe_head *sh, *next; | |
527 | ||
528 | list_for_each_entry_safe(sh, next, &io->stripe_list, log_list) { | |
529 | list_del_init(&sh->log_list); | |
2ded3703 SL |
530 | |
531 | r5c_finish_cache_stripe(sh); | |
532 | ||
d8858f43 CH |
533 | set_bit(STRIPE_HANDLE, &sh->state); |
534 | raid5_release_stripe(sh); | |
535 | } | |
536 | } | |
537 | ||
56fef7c6 CH |
538 | static void r5l_log_run_stripes(struct r5l_log *log) |
539 | { | |
540 | struct r5l_io_unit *io, *next; | |
541 | ||
542 | assert_spin_locked(&log->io_list_lock); | |
543 | ||
544 | list_for_each_entry_safe(io, next, &log->running_ios, log_sibling) { | |
545 | /* don't change list order */ | |
546 | if (io->state < IO_UNIT_IO_END) | |
547 | break; | |
548 | ||
549 | list_move_tail(&io->log_sibling, &log->finished_ios); | |
550 | r5l_io_run_stripes(io); | |
551 | } | |
552 | } | |
553 | ||
3848c0bc CH |
554 | static void r5l_move_to_end_ios(struct r5l_log *log) |
555 | { | |
556 | struct r5l_io_unit *io, *next; | |
557 | ||
558 | assert_spin_locked(&log->io_list_lock); | |
559 | ||
560 | list_for_each_entry_safe(io, next, &log->running_ios, log_sibling) { | |
561 | /* don't change list order */ | |
562 | if (io->state < IO_UNIT_IO_END) | |
563 | break; | |
564 | list_move_tail(&io->log_sibling, &log->io_end_ios); | |
565 | } | |
566 | } | |
567 | ||
3bddb7f8 | 568 | static void __r5l_stripe_write_finished(struct r5l_io_unit *io); |
f6bed0ef SL |
569 | static void r5l_log_endio(struct bio *bio) |
570 | { | |
571 | struct r5l_io_unit *io = bio->bi_private; | |
3bddb7f8 | 572 | struct r5l_io_unit *io_deferred; |
f6bed0ef | 573 | struct r5l_log *log = io->log; |
509ffec7 | 574 | unsigned long flags; |
a9501d74 SL |
575 | bool has_null_flush; |
576 | bool has_flush_payload; | |
f6bed0ef | 577 | |
4e4cbee9 | 578 | if (bio->bi_status) |
6e74a9cf SL |
579 | md_error(log->rdev->mddev, log->rdev); |
580 | ||
f6bed0ef | 581 | bio_put(bio); |
e8deb638 | 582 | mempool_free(io->meta_page, log->meta_pool); |
f6bed0ef | 583 | |
509ffec7 CH |
584 | spin_lock_irqsave(&log->io_list_lock, flags); |
585 | __r5l_set_io_unit_state(io, IO_UNIT_IO_END); | |
a9501d74 SL |
586 | |
587 | /* | |
588 | * if the io doesn't not have null_flush or flush payload, | |
589 | * it is not safe to access it after releasing io_list_lock. | |
590 | * Therefore, it is necessary to check the condition with | |
591 | * the lock held. | |
592 | */ | |
593 | has_null_flush = io->has_null_flush; | |
594 | has_flush_payload = io->has_flush_payload; | |
595 | ||
ea17481f | 596 | if (log->need_cache_flush && !list_empty(&io->stripe_list)) |
3848c0bc | 597 | r5l_move_to_end_ios(log); |
56fef7c6 CH |
598 | else |
599 | r5l_log_run_stripes(log); | |
3bddb7f8 SL |
600 | if (!list_empty(&log->running_ios)) { |
601 | /* | |
602 | * FLUSH/FUA io_unit is deferred because of ordering, now we | |
603 | * can dispatch it | |
604 | */ | |
605 | io_deferred = list_first_entry(&log->running_ios, | |
606 | struct r5l_io_unit, log_sibling); | |
607 | if (io_deferred->io_deferred) | |
608 | schedule_work(&log->deferred_io_work); | |
609 | } | |
610 | ||
509ffec7 CH |
611 | spin_unlock_irqrestore(&log->io_list_lock, flags); |
612 | ||
56fef7c6 CH |
613 | if (log->need_cache_flush) |
614 | md_wakeup_thread(log->rdev->mddev->thread); | |
3bddb7f8 | 615 | |
a9501d74 SL |
616 | /* finish flush only io_unit and PAYLOAD_FLUSH only io_unit */ |
617 | if (has_null_flush) { | |
3bddb7f8 SL |
618 | struct bio *bi; |
619 | ||
620 | WARN_ON(bio_list_empty(&io->flush_barriers)); | |
621 | while ((bi = bio_list_pop(&io->flush_barriers)) != NULL) { | |
622 | bio_endio(bi); | |
a9501d74 SL |
623 | if (atomic_dec_and_test(&io->pending_stripe)) { |
624 | __r5l_stripe_write_finished(io); | |
625 | return; | |
626 | } | |
3bddb7f8 | 627 | } |
3bddb7f8 | 628 | } |
a9501d74 SL |
629 | /* decrease pending_stripe for flush payload */ |
630 | if (has_flush_payload) | |
631 | if (atomic_dec_and_test(&io->pending_stripe)) | |
632 | __r5l_stripe_write_finished(io); | |
3bddb7f8 SL |
633 | } |
634 | ||
635 | static void r5l_do_submit_io(struct r5l_log *log, struct r5l_io_unit *io) | |
636 | { | |
637 | unsigned long flags; | |
638 | ||
639 | spin_lock_irqsave(&log->io_list_lock, flags); | |
640 | __r5l_set_io_unit_state(io, IO_UNIT_IO_START); | |
641 | spin_unlock_irqrestore(&log->io_list_lock, flags); | |
642 | ||
bb3338d3 SL |
643 | /* |
644 | * In case of journal device failures, submit_bio will get error | |
645 | * and calls endio, then active stripes will continue write | |
646 | * process. Therefore, it is not necessary to check Faulty bit | |
647 | * of journal device here. | |
648 | * | |
649 | * We can't check split_bio after current_bio is submitted. If | |
650 | * io->split_bio is null, after current_bio is submitted, current_bio | |
651 | * might already be completed and the io_unit is freed. We submit | |
652 | * split_bio first to avoid the issue. | |
653 | */ | |
654 | if (io->split_bio) { | |
655 | if (io->has_flush) | |
656 | io->split_bio->bi_opf |= REQ_PREFLUSH; | |
657 | if (io->has_fua) | |
658 | io->split_bio->bi_opf |= REQ_FUA; | |
659 | submit_bio(io->split_bio); | |
660 | } | |
661 | ||
3bddb7f8 | 662 | if (io->has_flush) |
20737738 | 663 | io->current_bio->bi_opf |= REQ_PREFLUSH; |
3bddb7f8 | 664 | if (io->has_fua) |
20737738 | 665 | io->current_bio->bi_opf |= REQ_FUA; |
3bddb7f8 | 666 | submit_bio(io->current_bio); |
3bddb7f8 SL |
667 | } |
668 | ||
669 | /* deferred io_unit will be dispatched here */ | |
670 | static void r5l_submit_io_async(struct work_struct *work) | |
671 | { | |
672 | struct r5l_log *log = container_of(work, struct r5l_log, | |
673 | deferred_io_work); | |
674 | struct r5l_io_unit *io = NULL; | |
675 | unsigned long flags; | |
676 | ||
677 | spin_lock_irqsave(&log->io_list_lock, flags); | |
678 | if (!list_empty(&log->running_ios)) { | |
679 | io = list_first_entry(&log->running_ios, struct r5l_io_unit, | |
680 | log_sibling); | |
681 | if (!io->io_deferred) | |
682 | io = NULL; | |
683 | else | |
684 | io->io_deferred = 0; | |
685 | } | |
686 | spin_unlock_irqrestore(&log->io_list_lock, flags); | |
687 | if (io) | |
688 | r5l_do_submit_io(log, io); | |
f6bed0ef SL |
689 | } |
690 | ||
2e38a37f SL |
691 | static void r5c_disable_writeback_async(struct work_struct *work) |
692 | { | |
693 | struct r5l_log *log = container_of(work, struct r5l_log, | |
694 | disable_writeback_work); | |
695 | struct mddev *mddev = log->rdev->mddev; | |
4d5324f7 N |
696 | struct r5conf *conf = mddev->private; |
697 | int locked = 0; | |
2e38a37f SL |
698 | |
699 | if (log->r5c_journal_mode == R5C_JOURNAL_MODE_WRITE_THROUGH) | |
700 | return; | |
701 | pr_info("md/raid:%s: Disabling writeback cache for degraded array.\n", | |
702 | mdname(mddev)); | |
70d466f7 SL |
703 | |
704 | /* wait superblock change before suspend */ | |
705 | wait_event(mddev->sb_wait, | |
4d5324f7 N |
706 | conf->log == NULL || |
707 | (!test_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags) && | |
708 | (locked = mddev_trylock(mddev)))); | |
709 | if (locked) { | |
710 | mddev_suspend(mddev); | |
711 | log->r5c_journal_mode = R5C_JOURNAL_MODE_WRITE_THROUGH; | |
712 | mddev_resume(mddev); | |
713 | mddev_unlock(mddev); | |
714 | } | |
2e38a37f SL |
715 | } |
716 | ||
f6bed0ef SL |
717 | static void r5l_submit_current_io(struct r5l_log *log) |
718 | { | |
719 | struct r5l_io_unit *io = log->current_io; | |
3bddb7f8 | 720 | struct bio *bio; |
f6bed0ef | 721 | struct r5l_meta_block *block; |
509ffec7 | 722 | unsigned long flags; |
f6bed0ef | 723 | u32 crc; |
3bddb7f8 | 724 | bool do_submit = true; |
f6bed0ef SL |
725 | |
726 | if (!io) | |
727 | return; | |
728 | ||
729 | block = page_address(io->meta_page); | |
730 | block->meta_size = cpu_to_le32(io->meta_offset); | |
5cb2fbd6 | 731 | crc = crc32c_le(log->uuid_checksum, block, PAGE_SIZE); |
f6bed0ef | 732 | block->checksum = cpu_to_le32(crc); |
3bddb7f8 | 733 | bio = io->current_bio; |
f6bed0ef SL |
734 | |
735 | log->current_io = NULL; | |
509ffec7 | 736 | spin_lock_irqsave(&log->io_list_lock, flags); |
3bddb7f8 SL |
737 | if (io->has_flush || io->has_fua) { |
738 | if (io != list_first_entry(&log->running_ios, | |
739 | struct r5l_io_unit, log_sibling)) { | |
740 | io->io_deferred = 1; | |
741 | do_submit = false; | |
742 | } | |
743 | } | |
509ffec7 | 744 | spin_unlock_irqrestore(&log->io_list_lock, flags); |
3bddb7f8 SL |
745 | if (do_submit) |
746 | r5l_do_submit_io(log, io); | |
f6bed0ef SL |
747 | } |
748 | ||
6143e2ce | 749 | static struct bio *r5l_bio_alloc(struct r5l_log *log) |
b349feb3 | 750 | { |
c38d29b3 | 751 | struct bio *bio = bio_alloc_bioset(GFP_NOIO, BIO_MAX_PAGES, log->bs); |
b349feb3 | 752 | |
796a5cf0 | 753 | bio_set_op_attrs(bio, REQ_OP_WRITE, 0); |
74d46992 | 754 | bio_set_dev(bio, log->rdev->bdev); |
1e932a37 | 755 | bio->bi_iter.bi_sector = log->rdev->data_offset + log->log_start; |
b349feb3 | 756 | |
b349feb3 CH |
757 | return bio; |
758 | } | |
759 | ||
c1b99198 CH |
760 | static void r5_reserve_log_entry(struct r5l_log *log, struct r5l_io_unit *io) |
761 | { | |
762 | log->log_start = r5l_ring_add(log, log->log_start, BLOCK_SECTORS); | |
763 | ||
a39f7afd | 764 | r5c_update_log_state(log); |
c1b99198 CH |
765 | /* |
766 | * If we filled up the log device start from the beginning again, | |
767 | * which will require a new bio. | |
768 | * | |
769 | * Note: for this to work properly the log size needs to me a multiple | |
770 | * of BLOCK_SECTORS. | |
771 | */ | |
772 | if (log->log_start == 0) | |
6143e2ce | 773 | io->need_split_bio = true; |
c1b99198 CH |
774 | |
775 | io->log_end = log->log_start; | |
776 | } | |
777 | ||
f6bed0ef SL |
778 | static struct r5l_io_unit *r5l_new_meta(struct r5l_log *log) |
779 | { | |
780 | struct r5l_io_unit *io; | |
781 | struct r5l_meta_block *block; | |
f6bed0ef | 782 | |
5036c390 CH |
783 | io = mempool_alloc(log->io_pool, GFP_ATOMIC); |
784 | if (!io) | |
785 | return NULL; | |
786 | memset(io, 0, sizeof(*io)); | |
787 | ||
51039cd0 | 788 | io->log = log; |
51039cd0 CH |
789 | INIT_LIST_HEAD(&io->log_sibling); |
790 | INIT_LIST_HEAD(&io->stripe_list); | |
3bddb7f8 | 791 | bio_list_init(&io->flush_barriers); |
51039cd0 | 792 | io->state = IO_UNIT_RUNNING; |
f6bed0ef | 793 | |
e8deb638 | 794 | io->meta_page = mempool_alloc(log->meta_pool, GFP_NOIO); |
f6bed0ef | 795 | block = page_address(io->meta_page); |
e8deb638 | 796 | clear_page(block); |
f6bed0ef SL |
797 | block->magic = cpu_to_le32(R5LOG_MAGIC); |
798 | block->version = R5LOG_VERSION; | |
799 | block->seq = cpu_to_le64(log->seq); | |
800 | block->position = cpu_to_le64(log->log_start); | |
801 | ||
802 | io->log_start = log->log_start; | |
803 | io->meta_offset = sizeof(struct r5l_meta_block); | |
2b8ef16e | 804 | io->seq = log->seq++; |
f6bed0ef | 805 | |
6143e2ce CH |
806 | io->current_bio = r5l_bio_alloc(log); |
807 | io->current_bio->bi_end_io = r5l_log_endio; | |
808 | io->current_bio->bi_private = io; | |
b349feb3 | 809 | bio_add_page(io->current_bio, io->meta_page, PAGE_SIZE, 0); |
f6bed0ef | 810 | |
c1b99198 | 811 | r5_reserve_log_entry(log, io); |
f6bed0ef SL |
812 | |
813 | spin_lock_irq(&log->io_list_lock); | |
814 | list_add_tail(&io->log_sibling, &log->running_ios); | |
815 | spin_unlock_irq(&log->io_list_lock); | |
816 | ||
817 | return io; | |
818 | } | |
819 | ||
820 | static int r5l_get_meta(struct r5l_log *log, unsigned int payload_size) | |
821 | { | |
22581f58 CH |
822 | if (log->current_io && |
823 | log->current_io->meta_offset + payload_size > PAGE_SIZE) | |
f6bed0ef | 824 | r5l_submit_current_io(log); |
f6bed0ef | 825 | |
5036c390 | 826 | if (!log->current_io) { |
22581f58 | 827 | log->current_io = r5l_new_meta(log); |
5036c390 CH |
828 | if (!log->current_io) |
829 | return -ENOMEM; | |
830 | } | |
831 | ||
f6bed0ef SL |
832 | return 0; |
833 | } | |
834 | ||
835 | static void r5l_append_payload_meta(struct r5l_log *log, u16 type, | |
836 | sector_t location, | |
837 | u32 checksum1, u32 checksum2, | |
838 | bool checksum2_valid) | |
839 | { | |
840 | struct r5l_io_unit *io = log->current_io; | |
841 | struct r5l_payload_data_parity *payload; | |
842 | ||
843 | payload = page_address(io->meta_page) + io->meta_offset; | |
844 | payload->header.type = cpu_to_le16(type); | |
845 | payload->header.flags = cpu_to_le16(0); | |
846 | payload->size = cpu_to_le32((1 + !!checksum2_valid) << | |
847 | (PAGE_SHIFT - 9)); | |
848 | payload->location = cpu_to_le64(location); | |
849 | payload->checksum[0] = cpu_to_le32(checksum1); | |
850 | if (checksum2_valid) | |
851 | payload->checksum[1] = cpu_to_le32(checksum2); | |
852 | ||
853 | io->meta_offset += sizeof(struct r5l_payload_data_parity) + | |
854 | sizeof(__le32) * (1 + !!checksum2_valid); | |
855 | } | |
856 | ||
857 | static void r5l_append_payload_page(struct r5l_log *log, struct page *page) | |
858 | { | |
859 | struct r5l_io_unit *io = log->current_io; | |
860 | ||
6143e2ce | 861 | if (io->need_split_bio) { |
3bddb7f8 SL |
862 | BUG_ON(io->split_bio); |
863 | io->split_bio = io->current_bio; | |
6143e2ce | 864 | io->current_bio = r5l_bio_alloc(log); |
3bddb7f8 SL |
865 | bio_chain(io->current_bio, io->split_bio); |
866 | io->need_split_bio = false; | |
f6bed0ef | 867 | } |
f6bed0ef | 868 | |
6143e2ce CH |
869 | if (!bio_add_page(io->current_bio, page, PAGE_SIZE, 0)) |
870 | BUG(); | |
871 | ||
c1b99198 | 872 | r5_reserve_log_entry(log, io); |
f6bed0ef SL |
873 | } |
874 | ||
ea17481f SL |
875 | static void r5l_append_flush_payload(struct r5l_log *log, sector_t sect) |
876 | { | |
877 | struct mddev *mddev = log->rdev->mddev; | |
878 | struct r5conf *conf = mddev->private; | |
879 | struct r5l_io_unit *io; | |
880 | struct r5l_payload_flush *payload; | |
881 | int meta_size; | |
882 | ||
883 | /* | |
884 | * payload_flush requires extra writes to the journal. | |
885 | * To avoid handling the extra IO in quiesce, just skip | |
886 | * flush_payload | |
887 | */ | |
888 | if (conf->quiesce) | |
889 | return; | |
890 | ||
891 | mutex_lock(&log->io_mutex); | |
892 | meta_size = sizeof(struct r5l_payload_flush) + sizeof(__le64); | |
893 | ||
894 | if (r5l_get_meta(log, meta_size)) { | |
895 | mutex_unlock(&log->io_mutex); | |
896 | return; | |
897 | } | |
898 | ||
899 | /* current implementation is one stripe per flush payload */ | |
900 | io = log->current_io; | |
901 | payload = page_address(io->meta_page) + io->meta_offset; | |
902 | payload->header.type = cpu_to_le16(R5LOG_PAYLOAD_FLUSH); | |
903 | payload->header.flags = cpu_to_le16(0); | |
904 | payload->size = cpu_to_le32(sizeof(__le64)); | |
905 | payload->flush_stripes[0] = cpu_to_le64(sect); | |
906 | io->meta_offset += meta_size; | |
a9501d74 SL |
907 | /* multiple flush payloads count as one pending_stripe */ |
908 | if (!io->has_flush_payload) { | |
909 | io->has_flush_payload = 1; | |
910 | atomic_inc(&io->pending_stripe); | |
911 | } | |
ea17481f SL |
912 | mutex_unlock(&log->io_mutex); |
913 | } | |
914 | ||
5036c390 | 915 | static int r5l_log_stripe(struct r5l_log *log, struct stripe_head *sh, |
f6bed0ef SL |
916 | int data_pages, int parity_pages) |
917 | { | |
918 | int i; | |
919 | int meta_size; | |
5036c390 | 920 | int ret; |
f6bed0ef SL |
921 | struct r5l_io_unit *io; |
922 | ||
923 | meta_size = | |
924 | ((sizeof(struct r5l_payload_data_parity) + sizeof(__le32)) | |
925 | * data_pages) + | |
926 | sizeof(struct r5l_payload_data_parity) + | |
927 | sizeof(__le32) * parity_pages; | |
928 | ||
5036c390 CH |
929 | ret = r5l_get_meta(log, meta_size); |
930 | if (ret) | |
931 | return ret; | |
932 | ||
f6bed0ef SL |
933 | io = log->current_io; |
934 | ||
3bddb7f8 SL |
935 | if (test_and_clear_bit(STRIPE_R5C_PREFLUSH, &sh->state)) |
936 | io->has_flush = 1; | |
937 | ||
f6bed0ef | 938 | for (i = 0; i < sh->disks; i++) { |
1e6d690b SL |
939 | if (!test_bit(R5_Wantwrite, &sh->dev[i].flags) || |
940 | test_bit(R5_InJournal, &sh->dev[i].flags)) | |
f6bed0ef SL |
941 | continue; |
942 | if (i == sh->pd_idx || i == sh->qd_idx) | |
943 | continue; | |
3bddb7f8 SL |
944 | if (test_bit(R5_WantFUA, &sh->dev[i].flags) && |
945 | log->r5c_journal_mode == R5C_JOURNAL_MODE_WRITE_BACK) { | |
946 | io->has_fua = 1; | |
947 | /* | |
948 | * we need to flush journal to make sure recovery can | |
949 | * reach the data with fua flag | |
950 | */ | |
951 | io->has_flush = 1; | |
952 | } | |
f6bed0ef SL |
953 | r5l_append_payload_meta(log, R5LOG_PAYLOAD_DATA, |
954 | raid5_compute_blocknr(sh, i, 0), | |
955 | sh->dev[i].log_checksum, 0, false); | |
956 | r5l_append_payload_page(log, sh->dev[i].page); | |
957 | } | |
958 | ||
2ded3703 | 959 | if (parity_pages == 2) { |
f6bed0ef SL |
960 | r5l_append_payload_meta(log, R5LOG_PAYLOAD_PARITY, |
961 | sh->sector, sh->dev[sh->pd_idx].log_checksum, | |
962 | sh->dev[sh->qd_idx].log_checksum, true); | |
963 | r5l_append_payload_page(log, sh->dev[sh->pd_idx].page); | |
964 | r5l_append_payload_page(log, sh->dev[sh->qd_idx].page); | |
2ded3703 | 965 | } else if (parity_pages == 1) { |
f6bed0ef SL |
966 | r5l_append_payload_meta(log, R5LOG_PAYLOAD_PARITY, |
967 | sh->sector, sh->dev[sh->pd_idx].log_checksum, | |
968 | 0, false); | |
969 | r5l_append_payload_page(log, sh->dev[sh->pd_idx].page); | |
2ded3703 SL |
970 | } else /* Just writing data, not parity, in caching phase */ |
971 | BUG_ON(parity_pages != 0); | |
f6bed0ef SL |
972 | |
973 | list_add_tail(&sh->log_list, &io->stripe_list); | |
974 | atomic_inc(&io->pending_stripe); | |
975 | sh->log_io = io; | |
5036c390 | 976 | |
a39f7afd SL |
977 | if (log->r5c_journal_mode == R5C_JOURNAL_MODE_WRITE_THROUGH) |
978 | return 0; | |
979 | ||
980 | if (sh->log_start == MaxSector) { | |
981 | BUG_ON(!list_empty(&sh->r5c)); | |
982 | sh->log_start = io->log_start; | |
983 | spin_lock_irq(&log->stripe_in_journal_lock); | |
984 | list_add_tail(&sh->r5c, | |
985 | &log->stripe_in_journal_list); | |
986 | spin_unlock_irq(&log->stripe_in_journal_lock); | |
987 | atomic_inc(&log->stripe_in_journal_count); | |
988 | } | |
5036c390 | 989 | return 0; |
f6bed0ef SL |
990 | } |
991 | ||
a39f7afd SL |
992 | /* add stripe to no_space_stripes, and then wake up reclaim */ |
993 | static inline void r5l_add_no_space_stripe(struct r5l_log *log, | |
994 | struct stripe_head *sh) | |
995 | { | |
996 | spin_lock(&log->no_space_stripes_lock); | |
997 | list_add_tail(&sh->log_list, &log->no_space_stripes); | |
998 | spin_unlock(&log->no_space_stripes_lock); | |
999 | } | |
1000 | ||
f6bed0ef SL |
1001 | /* |
1002 | * running in raid5d, where reclaim could wait for raid5d too (when it flushes | |
1003 | * data from log to raid disks), so we shouldn't wait for reclaim here | |
1004 | */ | |
1005 | int r5l_write_stripe(struct r5l_log *log, struct stripe_head *sh) | |
1006 | { | |
a39f7afd | 1007 | struct r5conf *conf = sh->raid_conf; |
f6bed0ef SL |
1008 | int write_disks = 0; |
1009 | int data_pages, parity_pages; | |
f6bed0ef SL |
1010 | int reserve; |
1011 | int i; | |
5036c390 | 1012 | int ret = 0; |
a39f7afd | 1013 | bool wake_reclaim = false; |
f6bed0ef SL |
1014 | |
1015 | if (!log) | |
1016 | return -EAGAIN; | |
1017 | /* Don't support stripe batch */ | |
1018 | if (sh->log_io || !test_bit(R5_Wantwrite, &sh->dev[sh->pd_idx].flags) || | |
1019 | test_bit(STRIPE_SYNCING, &sh->state)) { | |
1020 | /* the stripe is written to log, we start writing it to raid */ | |
1021 | clear_bit(STRIPE_LOG_TRAPPED, &sh->state); | |
1022 | return -EAGAIN; | |
1023 | } | |
1024 | ||
2ded3703 SL |
1025 | WARN_ON(test_bit(STRIPE_R5C_CACHING, &sh->state)); |
1026 | ||
f6bed0ef SL |
1027 | for (i = 0; i < sh->disks; i++) { |
1028 | void *addr; | |
1029 | ||
1e6d690b SL |
1030 | if (!test_bit(R5_Wantwrite, &sh->dev[i].flags) || |
1031 | test_bit(R5_InJournal, &sh->dev[i].flags)) | |
f6bed0ef | 1032 | continue; |
1e6d690b | 1033 | |
f6bed0ef SL |
1034 | write_disks++; |
1035 | /* checksum is already calculated in last run */ | |
1036 | if (test_bit(STRIPE_LOG_TRAPPED, &sh->state)) | |
1037 | continue; | |
1038 | addr = kmap_atomic(sh->dev[i].page); | |
5cb2fbd6 SL |
1039 | sh->dev[i].log_checksum = crc32c_le(log->uuid_checksum, |
1040 | addr, PAGE_SIZE); | |
f6bed0ef SL |
1041 | kunmap_atomic(addr); |
1042 | } | |
1043 | parity_pages = 1 + !!(sh->qd_idx >= 0); | |
1044 | data_pages = write_disks - parity_pages; | |
1045 | ||
f6bed0ef | 1046 | set_bit(STRIPE_LOG_TRAPPED, &sh->state); |
253f9fd4 SL |
1047 | /* |
1048 | * The stripe must enter state machine again to finish the write, so | |
1049 | * don't delay. | |
1050 | */ | |
1051 | clear_bit(STRIPE_DELAYED, &sh->state); | |
f6bed0ef SL |
1052 | atomic_inc(&sh->count); |
1053 | ||
1054 | mutex_lock(&log->io_mutex); | |
1055 | /* meta + data */ | |
1056 | reserve = (1 + write_disks) << (PAGE_SHIFT - 9); | |
f6bed0ef | 1057 | |
a39f7afd SL |
1058 | if (log->r5c_journal_mode == R5C_JOURNAL_MODE_WRITE_THROUGH) { |
1059 | if (!r5l_has_free_space(log, reserve)) { | |
1060 | r5l_add_no_space_stripe(log, sh); | |
1061 | wake_reclaim = true; | |
1062 | } else { | |
1063 | ret = r5l_log_stripe(log, sh, data_pages, parity_pages); | |
1064 | if (ret) { | |
1065 | spin_lock_irq(&log->io_list_lock); | |
1066 | list_add_tail(&sh->log_list, | |
1067 | &log->no_mem_stripes); | |
1068 | spin_unlock_irq(&log->io_list_lock); | |
1069 | } | |
1070 | } | |
1071 | } else { /* R5C_JOURNAL_MODE_WRITE_BACK */ | |
1072 | /* | |
1073 | * log space critical, do not process stripes that are | |
1074 | * not in cache yet (sh->log_start == MaxSector). | |
1075 | */ | |
1076 | if (test_bit(R5C_LOG_CRITICAL, &conf->cache_state) && | |
1077 | sh->log_start == MaxSector) { | |
1078 | r5l_add_no_space_stripe(log, sh); | |
1079 | wake_reclaim = true; | |
1080 | reserve = 0; | |
1081 | } else if (!r5l_has_free_space(log, reserve)) { | |
1082 | if (sh->log_start == log->last_checkpoint) | |
1083 | BUG(); | |
1084 | else | |
1085 | r5l_add_no_space_stripe(log, sh); | |
1086 | } else { | |
1087 | ret = r5l_log_stripe(log, sh, data_pages, parity_pages); | |
1088 | if (ret) { | |
1089 | spin_lock_irq(&log->io_list_lock); | |
1090 | list_add_tail(&sh->log_list, | |
1091 | &log->no_mem_stripes); | |
1092 | spin_unlock_irq(&log->io_list_lock); | |
1093 | } | |
5036c390 | 1094 | } |
f6bed0ef | 1095 | } |
f6bed0ef | 1096 | |
5036c390 | 1097 | mutex_unlock(&log->io_mutex); |
a39f7afd SL |
1098 | if (wake_reclaim) |
1099 | r5l_wake_reclaim(log, reserve); | |
f6bed0ef SL |
1100 | return 0; |
1101 | } | |
1102 | ||
1103 | void r5l_write_stripe_run(struct r5l_log *log) | |
1104 | { | |
1105 | if (!log) | |
1106 | return; | |
1107 | mutex_lock(&log->io_mutex); | |
1108 | r5l_submit_current_io(log); | |
1109 | mutex_unlock(&log->io_mutex); | |
1110 | } | |
1111 | ||
828cbe98 SL |
1112 | int r5l_handle_flush_request(struct r5l_log *log, struct bio *bio) |
1113 | { | |
1114 | if (!log) | |
1115 | return -ENODEV; | |
3bddb7f8 SL |
1116 | |
1117 | if (log->r5c_journal_mode == R5C_JOURNAL_MODE_WRITE_THROUGH) { | |
1118 | /* | |
1119 | * in write through (journal only) | |
1120 | * we flush log disk cache first, then write stripe data to | |
1121 | * raid disks. So if bio is finished, the log disk cache is | |
1122 | * flushed already. The recovery guarantees we can recovery | |
1123 | * the bio from log disk, so we don't need to flush again | |
1124 | */ | |
1125 | if (bio->bi_iter.bi_size == 0) { | |
1126 | bio_endio(bio); | |
1127 | return 0; | |
1128 | } | |
1129 | bio->bi_opf &= ~REQ_PREFLUSH; | |
1130 | } else { | |
1131 | /* write back (with cache) */ | |
1132 | if (bio->bi_iter.bi_size == 0) { | |
1133 | mutex_lock(&log->io_mutex); | |
1134 | r5l_get_meta(log, 0); | |
1135 | bio_list_add(&log->current_io->flush_barriers, bio); | |
1136 | log->current_io->has_flush = 1; | |
1137 | log->current_io->has_null_flush = 1; | |
1138 | atomic_inc(&log->current_io->pending_stripe); | |
1139 | r5l_submit_current_io(log); | |
1140 | mutex_unlock(&log->io_mutex); | |
1141 | return 0; | |
1142 | } | |
828cbe98 | 1143 | } |
828cbe98 SL |
1144 | return -EAGAIN; |
1145 | } | |
1146 | ||
f6bed0ef SL |
1147 | /* This will run after log space is reclaimed */ |
1148 | static void r5l_run_no_space_stripes(struct r5l_log *log) | |
1149 | { | |
1150 | struct stripe_head *sh; | |
1151 | ||
1152 | spin_lock(&log->no_space_stripes_lock); | |
1153 | while (!list_empty(&log->no_space_stripes)) { | |
1154 | sh = list_first_entry(&log->no_space_stripes, | |
1155 | struct stripe_head, log_list); | |
1156 | list_del_init(&sh->log_list); | |
1157 | set_bit(STRIPE_HANDLE, &sh->state); | |
1158 | raid5_release_stripe(sh); | |
1159 | } | |
1160 | spin_unlock(&log->no_space_stripes_lock); | |
1161 | } | |
1162 | ||
a39f7afd SL |
1163 | /* |
1164 | * calculate new last_checkpoint | |
1165 | * for write through mode, returns log->next_checkpoint | |
1166 | * for write back, returns log_start of first sh in stripe_in_journal_list | |
1167 | */ | |
1168 | static sector_t r5c_calculate_new_cp(struct r5conf *conf) | |
1169 | { | |
1170 | struct stripe_head *sh; | |
1171 | struct r5l_log *log = conf->log; | |
1172 | sector_t new_cp; | |
1173 | unsigned long flags; | |
1174 | ||
1175 | if (log->r5c_journal_mode == R5C_JOURNAL_MODE_WRITE_THROUGH) | |
1176 | return log->next_checkpoint; | |
1177 | ||
1178 | spin_lock_irqsave(&log->stripe_in_journal_lock, flags); | |
1179 | if (list_empty(&conf->log->stripe_in_journal_list)) { | |
1180 | /* all stripes flushed */ | |
d3014e21 | 1181 | spin_unlock_irqrestore(&log->stripe_in_journal_lock, flags); |
a39f7afd SL |
1182 | return log->next_checkpoint; |
1183 | } | |
1184 | sh = list_first_entry(&conf->log->stripe_in_journal_list, | |
1185 | struct stripe_head, r5c); | |
1186 | new_cp = sh->log_start; | |
1187 | spin_unlock_irqrestore(&log->stripe_in_journal_lock, flags); | |
1188 | return new_cp; | |
1189 | } | |
1190 | ||
17036461 CH |
1191 | static sector_t r5l_reclaimable_space(struct r5l_log *log) |
1192 | { | |
a39f7afd SL |
1193 | struct r5conf *conf = log->rdev->mddev->private; |
1194 | ||
17036461 | 1195 | return r5l_ring_distance(log, log->last_checkpoint, |
a39f7afd | 1196 | r5c_calculate_new_cp(conf)); |
17036461 CH |
1197 | } |
1198 | ||
5036c390 CH |
1199 | static void r5l_run_no_mem_stripe(struct r5l_log *log) |
1200 | { | |
1201 | struct stripe_head *sh; | |
1202 | ||
1203 | assert_spin_locked(&log->io_list_lock); | |
1204 | ||
1205 | if (!list_empty(&log->no_mem_stripes)) { | |
1206 | sh = list_first_entry(&log->no_mem_stripes, | |
1207 | struct stripe_head, log_list); | |
1208 | list_del_init(&sh->log_list); | |
1209 | set_bit(STRIPE_HANDLE, &sh->state); | |
1210 | raid5_release_stripe(sh); | |
1211 | } | |
1212 | } | |
1213 | ||
04732f74 | 1214 | static bool r5l_complete_finished_ios(struct r5l_log *log) |
17036461 CH |
1215 | { |
1216 | struct r5l_io_unit *io, *next; | |
1217 | bool found = false; | |
1218 | ||
1219 | assert_spin_locked(&log->io_list_lock); | |
1220 | ||
04732f74 | 1221 | list_for_each_entry_safe(io, next, &log->finished_ios, log_sibling) { |
17036461 CH |
1222 | /* don't change list order */ |
1223 | if (io->state < IO_UNIT_STRIPE_END) | |
1224 | break; | |
1225 | ||
1226 | log->next_checkpoint = io->log_start; | |
17036461 CH |
1227 | |
1228 | list_del(&io->log_sibling); | |
5036c390 CH |
1229 | mempool_free(io, log->io_pool); |
1230 | r5l_run_no_mem_stripe(log); | |
17036461 CH |
1231 | |
1232 | found = true; | |
1233 | } | |
1234 | ||
1235 | return found; | |
1236 | } | |
1237 | ||
509ffec7 CH |
1238 | static void __r5l_stripe_write_finished(struct r5l_io_unit *io) |
1239 | { | |
1240 | struct r5l_log *log = io->log; | |
a39f7afd | 1241 | struct r5conf *conf = log->rdev->mddev->private; |
509ffec7 CH |
1242 | unsigned long flags; |
1243 | ||
1244 | spin_lock_irqsave(&log->io_list_lock, flags); | |
1245 | __r5l_set_io_unit_state(io, IO_UNIT_STRIPE_END); | |
17036461 | 1246 | |
04732f74 | 1247 | if (!r5l_complete_finished_ios(log)) { |
85f2f9a4 SL |
1248 | spin_unlock_irqrestore(&log->io_list_lock, flags); |
1249 | return; | |
1250 | } | |
509ffec7 | 1251 | |
a39f7afd SL |
1252 | if (r5l_reclaimable_space(log) > log->max_free_space || |
1253 | test_bit(R5C_LOG_TIGHT, &conf->cache_state)) | |
509ffec7 CH |
1254 | r5l_wake_reclaim(log, 0); |
1255 | ||
509ffec7 CH |
1256 | spin_unlock_irqrestore(&log->io_list_lock, flags); |
1257 | wake_up(&log->iounit_wait); | |
1258 | } | |
1259 | ||
0576b1c6 SL |
1260 | void r5l_stripe_write_finished(struct stripe_head *sh) |
1261 | { | |
1262 | struct r5l_io_unit *io; | |
1263 | ||
0576b1c6 | 1264 | io = sh->log_io; |
0576b1c6 SL |
1265 | sh->log_io = NULL; |
1266 | ||
509ffec7 CH |
1267 | if (io && atomic_dec_and_test(&io->pending_stripe)) |
1268 | __r5l_stripe_write_finished(io); | |
0576b1c6 SL |
1269 | } |
1270 | ||
a8c34f91 SL |
1271 | static void r5l_log_flush_endio(struct bio *bio) |
1272 | { | |
1273 | struct r5l_log *log = container_of(bio, struct r5l_log, | |
1274 | flush_bio); | |
1275 | unsigned long flags; | |
1276 | struct r5l_io_unit *io; | |
a8c34f91 | 1277 | |
4e4cbee9 | 1278 | if (bio->bi_status) |
6e74a9cf SL |
1279 | md_error(log->rdev->mddev, log->rdev); |
1280 | ||
a8c34f91 | 1281 | spin_lock_irqsave(&log->io_list_lock, flags); |
d8858f43 CH |
1282 | list_for_each_entry(io, &log->flushing_ios, log_sibling) |
1283 | r5l_io_run_stripes(io); | |
04732f74 | 1284 | list_splice_tail_init(&log->flushing_ios, &log->finished_ios); |
a8c34f91 SL |
1285 | spin_unlock_irqrestore(&log->io_list_lock, flags); |
1286 | } | |
1287 | ||
0576b1c6 SL |
1288 | /* |
1289 | * Starting dispatch IO to raid. | |
1290 | * io_unit(meta) consists of a log. There is one situation we want to avoid. A | |
1291 | * broken meta in the middle of a log causes recovery can't find meta at the | |
1292 | * head of log. If operations require meta at the head persistent in log, we | |
1293 | * must make sure meta before it persistent in log too. A case is: | |
1294 | * | |
1295 | * stripe data/parity is in log, we start write stripe to raid disks. stripe | |
1296 | * data/parity must be persistent in log before we do the write to raid disks. | |
1297 | * | |
1298 | * The solution is we restrictly maintain io_unit list order. In this case, we | |
1299 | * only write stripes of an io_unit to raid disks till the io_unit is the first | |
1300 | * one whose data/parity is in log. | |
1301 | */ | |
1302 | void r5l_flush_stripe_to_raid(struct r5l_log *log) | |
1303 | { | |
a8c34f91 | 1304 | bool do_flush; |
56fef7c6 CH |
1305 | |
1306 | if (!log || !log->need_cache_flush) | |
0576b1c6 | 1307 | return; |
0576b1c6 SL |
1308 | |
1309 | spin_lock_irq(&log->io_list_lock); | |
a8c34f91 SL |
1310 | /* flush bio is running */ |
1311 | if (!list_empty(&log->flushing_ios)) { | |
1312 | spin_unlock_irq(&log->io_list_lock); | |
1313 | return; | |
0576b1c6 | 1314 | } |
a8c34f91 SL |
1315 | list_splice_tail_init(&log->io_end_ios, &log->flushing_ios); |
1316 | do_flush = !list_empty(&log->flushing_ios); | |
0576b1c6 | 1317 | spin_unlock_irq(&log->io_list_lock); |
a8c34f91 SL |
1318 | |
1319 | if (!do_flush) | |
1320 | return; | |
1321 | bio_reset(&log->flush_bio); | |
74d46992 | 1322 | bio_set_dev(&log->flush_bio, log->rdev->bdev); |
a8c34f91 | 1323 | log->flush_bio.bi_end_io = r5l_log_flush_endio; |
70fd7614 | 1324 | log->flush_bio.bi_opf = REQ_OP_WRITE | REQ_PREFLUSH; |
4e49ea4a | 1325 | submit_bio(&log->flush_bio); |
0576b1c6 SL |
1326 | } |
1327 | ||
0576b1c6 | 1328 | static void r5l_write_super(struct r5l_log *log, sector_t cp); |
4b482044 SL |
1329 | static void r5l_write_super_and_discard_space(struct r5l_log *log, |
1330 | sector_t end) | |
1331 | { | |
1332 | struct block_device *bdev = log->rdev->bdev; | |
1333 | struct mddev *mddev; | |
1334 | ||
1335 | r5l_write_super(log, end); | |
1336 | ||
1337 | if (!blk_queue_discard(bdev_get_queue(bdev))) | |
1338 | return; | |
1339 | ||
1340 | mddev = log->rdev->mddev; | |
1341 | /* | |
8e018c21 SL |
1342 | * Discard could zero data, so before discard we must make sure |
1343 | * superblock is updated to new log tail. Updating superblock (either | |
1344 | * directly call md_update_sb() or depend on md thread) must hold | |
1345 | * reconfig mutex. On the other hand, raid5_quiesce is called with | |
1346 | * reconfig_mutex hold. The first step of raid5_quiesce() is waitting | |
1347 | * for all IO finish, hence waitting for reclaim thread, while reclaim | |
1348 | * thread is calling this function and waitting for reconfig mutex. So | |
1349 | * there is a deadlock. We workaround this issue with a trylock. | |
1350 | * FIXME: we could miss discard if we can't take reconfig mutex | |
4b482044 | 1351 | */ |
2953079c SL |
1352 | set_mask_bits(&mddev->sb_flags, 0, |
1353 | BIT(MD_SB_CHANGE_DEVS) | BIT(MD_SB_CHANGE_PENDING)); | |
8e018c21 SL |
1354 | if (!mddev_trylock(mddev)) |
1355 | return; | |
1356 | md_update_sb(mddev, 1); | |
1357 | mddev_unlock(mddev); | |
4b482044 | 1358 | |
6e74a9cf | 1359 | /* discard IO error really doesn't matter, ignore it */ |
4b482044 SL |
1360 | if (log->last_checkpoint < end) { |
1361 | blkdev_issue_discard(bdev, | |
1362 | log->last_checkpoint + log->rdev->data_offset, | |
1363 | end - log->last_checkpoint, GFP_NOIO, 0); | |
1364 | } else { | |
1365 | blkdev_issue_discard(bdev, | |
1366 | log->last_checkpoint + log->rdev->data_offset, | |
1367 | log->device_size - log->last_checkpoint, | |
1368 | GFP_NOIO, 0); | |
1369 | blkdev_issue_discard(bdev, log->rdev->data_offset, end, | |
1370 | GFP_NOIO, 0); | |
1371 | } | |
1372 | } | |
1373 | ||
a39f7afd SL |
1374 | /* |
1375 | * r5c_flush_stripe moves stripe from cached list to handle_list. When called, | |
1376 | * the stripe must be on r5c_cached_full_stripes or r5c_cached_partial_stripes. | |
1377 | * | |
1378 | * must hold conf->device_lock | |
1379 | */ | |
1380 | static void r5c_flush_stripe(struct r5conf *conf, struct stripe_head *sh) | |
0576b1c6 | 1381 | { |
a39f7afd SL |
1382 | BUG_ON(list_empty(&sh->lru)); |
1383 | BUG_ON(!test_bit(STRIPE_R5C_CACHING, &sh->state)); | |
1384 | BUG_ON(test_bit(STRIPE_HANDLE, &sh->state)); | |
0576b1c6 | 1385 | |
0576b1c6 | 1386 | /* |
a39f7afd SL |
1387 | * The stripe is not ON_RELEASE_LIST, so it is safe to call |
1388 | * raid5_release_stripe() while holding conf->device_lock | |
0576b1c6 | 1389 | */ |
a39f7afd SL |
1390 | BUG_ON(test_bit(STRIPE_ON_RELEASE_LIST, &sh->state)); |
1391 | assert_spin_locked(&conf->device_lock); | |
0576b1c6 | 1392 | |
a39f7afd SL |
1393 | list_del_init(&sh->lru); |
1394 | atomic_inc(&sh->count); | |
17036461 | 1395 | |
a39f7afd SL |
1396 | set_bit(STRIPE_HANDLE, &sh->state); |
1397 | atomic_inc(&conf->active_stripes); | |
1398 | r5c_make_stripe_write_out(sh); | |
0576b1c6 | 1399 | |
e33fbb9c SL |
1400 | if (test_bit(STRIPE_R5C_PARTIAL_STRIPE, &sh->state)) |
1401 | atomic_inc(&conf->r5c_flushing_partial_stripes); | |
1402 | else | |
1403 | atomic_inc(&conf->r5c_flushing_full_stripes); | |
a39f7afd SL |
1404 | raid5_release_stripe(sh); |
1405 | } | |
1406 | ||
1407 | /* | |
1408 | * if num == 0, flush all full stripes | |
1409 | * if num > 0, flush all full stripes. If less than num full stripes are | |
1410 | * flushed, flush some partial stripes until totally num stripes are | |
1411 | * flushed or there is no more cached stripes. | |
1412 | */ | |
1413 | void r5c_flush_cache(struct r5conf *conf, int num) | |
1414 | { | |
1415 | int count; | |
1416 | struct stripe_head *sh, *next; | |
1417 | ||
1418 | assert_spin_locked(&conf->device_lock); | |
1419 | if (!conf->log) | |
0576b1c6 SL |
1420 | return; |
1421 | ||
a39f7afd SL |
1422 | count = 0; |
1423 | list_for_each_entry_safe(sh, next, &conf->r5c_full_stripe_list, lru) { | |
1424 | r5c_flush_stripe(conf, sh); | |
1425 | count++; | |
1426 | } | |
1427 | ||
1428 | if (count >= num) | |
1429 | return; | |
1430 | list_for_each_entry_safe(sh, next, | |
1431 | &conf->r5c_partial_stripe_list, lru) { | |
1432 | r5c_flush_stripe(conf, sh); | |
1433 | if (++count >= num) | |
1434 | break; | |
1435 | } | |
1436 | } | |
1437 | ||
1438 | static void r5c_do_reclaim(struct r5conf *conf) | |
1439 | { | |
1440 | struct r5l_log *log = conf->log; | |
1441 | struct stripe_head *sh; | |
1442 | int count = 0; | |
1443 | unsigned long flags; | |
1444 | int total_cached; | |
1445 | int stripes_to_flush; | |
e33fbb9c | 1446 | int flushing_partial, flushing_full; |
a39f7afd SL |
1447 | |
1448 | if (!r5c_is_writeback(log)) | |
1449 | return; | |
1450 | ||
e33fbb9c SL |
1451 | flushing_partial = atomic_read(&conf->r5c_flushing_partial_stripes); |
1452 | flushing_full = atomic_read(&conf->r5c_flushing_full_stripes); | |
a39f7afd | 1453 | total_cached = atomic_read(&conf->r5c_cached_partial_stripes) + |
e33fbb9c SL |
1454 | atomic_read(&conf->r5c_cached_full_stripes) - |
1455 | flushing_full - flushing_partial; | |
a39f7afd SL |
1456 | |
1457 | if (total_cached > conf->min_nr_stripes * 3 / 4 || | |
1458 | atomic_read(&conf->empty_inactive_list_nr) > 0) | |
1459 | /* | |
1460 | * if stripe cache pressure high, flush all full stripes and | |
1461 | * some partial stripes | |
1462 | */ | |
1463 | stripes_to_flush = R5C_RECLAIM_STRIPE_GROUP; | |
1464 | else if (total_cached > conf->min_nr_stripes * 1 / 2 || | |
e33fbb9c | 1465 | atomic_read(&conf->r5c_cached_full_stripes) - flushing_full > |
84890c03 | 1466 | R5C_FULL_STRIPE_FLUSH_BATCH(conf)) |
a39f7afd SL |
1467 | /* |
1468 | * if stripe cache pressure moderate, or if there is many full | |
1469 | * stripes,flush all full stripes | |
1470 | */ | |
1471 | stripes_to_flush = 0; | |
1472 | else | |
1473 | /* no need to flush */ | |
1474 | stripes_to_flush = -1; | |
1475 | ||
1476 | if (stripes_to_flush >= 0) { | |
1477 | spin_lock_irqsave(&conf->device_lock, flags); | |
1478 | r5c_flush_cache(conf, stripes_to_flush); | |
1479 | spin_unlock_irqrestore(&conf->device_lock, flags); | |
1480 | } | |
1481 | ||
1482 | /* if log space is tight, flush stripes on stripe_in_journal_list */ | |
1483 | if (test_bit(R5C_LOG_TIGHT, &conf->cache_state)) { | |
1484 | spin_lock_irqsave(&log->stripe_in_journal_lock, flags); | |
1485 | spin_lock(&conf->device_lock); | |
1486 | list_for_each_entry(sh, &log->stripe_in_journal_list, r5c) { | |
1487 | /* | |
1488 | * stripes on stripe_in_journal_list could be in any | |
1489 | * state of the stripe_cache state machine. In this | |
1490 | * case, we only want to flush stripe on | |
1491 | * r5c_cached_full/partial_stripes. The following | |
1492 | * condition makes sure the stripe is on one of the | |
1493 | * two lists. | |
1494 | */ | |
1495 | if (!list_empty(&sh->lru) && | |
1496 | !test_bit(STRIPE_HANDLE, &sh->state) && | |
1497 | atomic_read(&sh->count) == 0) { | |
1498 | r5c_flush_stripe(conf, sh); | |
e8fd52ee SL |
1499 | if (count++ >= R5C_RECLAIM_STRIPE_GROUP) |
1500 | break; | |
a39f7afd | 1501 | } |
a39f7afd SL |
1502 | } |
1503 | spin_unlock(&conf->device_lock); | |
1504 | spin_unlock_irqrestore(&log->stripe_in_journal_lock, flags); | |
1505 | } | |
f687a33e SL |
1506 | |
1507 | if (!test_bit(R5C_LOG_CRITICAL, &conf->cache_state)) | |
1508 | r5l_run_no_space_stripes(log); | |
1509 | ||
a39f7afd SL |
1510 | md_wakeup_thread(conf->mddev->thread); |
1511 | } | |
1512 | ||
0576b1c6 SL |
1513 | static void r5l_do_reclaim(struct r5l_log *log) |
1514 | { | |
a39f7afd | 1515 | struct r5conf *conf = log->rdev->mddev->private; |
0576b1c6 | 1516 | sector_t reclaim_target = xchg(&log->reclaim_target, 0); |
17036461 CH |
1517 | sector_t reclaimable; |
1518 | sector_t next_checkpoint; | |
a39f7afd | 1519 | bool write_super; |
0576b1c6 SL |
1520 | |
1521 | spin_lock_irq(&log->io_list_lock); | |
a39f7afd SL |
1522 | write_super = r5l_reclaimable_space(log) > log->max_free_space || |
1523 | reclaim_target != 0 || !list_empty(&log->no_space_stripes); | |
0576b1c6 SL |
1524 | /* |
1525 | * move proper io_unit to reclaim list. We should not change the order. | |
1526 | * reclaimable/unreclaimable io_unit can be mixed in the list, we | |
1527 | * shouldn't reuse space of an unreclaimable io_unit | |
1528 | */ | |
1529 | while (1) { | |
17036461 CH |
1530 | reclaimable = r5l_reclaimable_space(log); |
1531 | if (reclaimable >= reclaim_target || | |
0576b1c6 SL |
1532 | (list_empty(&log->running_ios) && |
1533 | list_empty(&log->io_end_ios) && | |
a8c34f91 | 1534 | list_empty(&log->flushing_ios) && |
04732f74 | 1535 | list_empty(&log->finished_ios))) |
0576b1c6 SL |
1536 | break; |
1537 | ||
17036461 CH |
1538 | md_wakeup_thread(log->rdev->mddev->thread); |
1539 | wait_event_lock_irq(log->iounit_wait, | |
1540 | r5l_reclaimable_space(log) > reclaimable, | |
1541 | log->io_list_lock); | |
0576b1c6 | 1542 | } |
17036461 | 1543 | |
a39f7afd | 1544 | next_checkpoint = r5c_calculate_new_cp(conf); |
0576b1c6 SL |
1545 | spin_unlock_irq(&log->io_list_lock); |
1546 | ||
a39f7afd | 1547 | if (reclaimable == 0 || !write_super) |
0576b1c6 SL |
1548 | return; |
1549 | ||
0576b1c6 SL |
1550 | /* |
1551 | * write_super will flush cache of each raid disk. We must write super | |
1552 | * here, because the log area might be reused soon and we don't want to | |
1553 | * confuse recovery | |
1554 | */ | |
4b482044 | 1555 | r5l_write_super_and_discard_space(log, next_checkpoint); |
0576b1c6 SL |
1556 | |
1557 | mutex_lock(&log->io_mutex); | |
17036461 | 1558 | log->last_checkpoint = next_checkpoint; |
a39f7afd | 1559 | r5c_update_log_state(log); |
0576b1c6 | 1560 | mutex_unlock(&log->io_mutex); |
0576b1c6 | 1561 | |
17036461 | 1562 | r5l_run_no_space_stripes(log); |
0576b1c6 SL |
1563 | } |
1564 | ||
1565 | static void r5l_reclaim_thread(struct md_thread *thread) | |
1566 | { | |
1567 | struct mddev *mddev = thread->mddev; | |
1568 | struct r5conf *conf = mddev->private; | |
1569 | struct r5l_log *log = conf->log; | |
1570 | ||
1571 | if (!log) | |
1572 | return; | |
a39f7afd | 1573 | r5c_do_reclaim(conf); |
0576b1c6 SL |
1574 | r5l_do_reclaim(log); |
1575 | } | |
1576 | ||
a39f7afd | 1577 | void r5l_wake_reclaim(struct r5l_log *log, sector_t space) |
f6bed0ef | 1578 | { |
0576b1c6 SL |
1579 | unsigned long target; |
1580 | unsigned long new = (unsigned long)space; /* overflow in theory */ | |
1581 | ||
a39f7afd SL |
1582 | if (!log) |
1583 | return; | |
0576b1c6 SL |
1584 | do { |
1585 | target = log->reclaim_target; | |
1586 | if (new < target) | |
1587 | return; | |
1588 | } while (cmpxchg(&log->reclaim_target, target, new) != target); | |
1589 | md_wakeup_thread(log->reclaim_thread); | |
f6bed0ef SL |
1590 | } |
1591 | ||
b03e0ccb | 1592 | void r5l_quiesce(struct r5l_log *log, int quiesce) |
e6c033f7 | 1593 | { |
4b482044 | 1594 | struct mddev *mddev; |
b03e0ccb | 1595 | if (!log) |
e6c033f7 | 1596 | return; |
b03e0ccb N |
1597 | |
1598 | if (quiesce) { | |
4b482044 SL |
1599 | /* make sure r5l_write_super_and_discard_space exits */ |
1600 | mddev = log->rdev->mddev; | |
1601 | wake_up(&mddev->sb_wait); | |
ce1ccd07 | 1602 | kthread_park(log->reclaim_thread->tsk); |
a39f7afd | 1603 | r5l_wake_reclaim(log, MaxSector); |
e6c033f7 | 1604 | r5l_do_reclaim(log); |
b03e0ccb N |
1605 | } else |
1606 | kthread_unpark(log->reclaim_thread->tsk); | |
e6c033f7 SL |
1607 | } |
1608 | ||
6e74a9cf SL |
1609 | bool r5l_log_disk_error(struct r5conf *conf) |
1610 | { | |
f6b6ec5c SL |
1611 | struct r5l_log *log; |
1612 | bool ret; | |
7dde2ad3 | 1613 | /* don't allow write if journal disk is missing */ |
f6b6ec5c SL |
1614 | rcu_read_lock(); |
1615 | log = rcu_dereference(conf->log); | |
1616 | ||
1617 | if (!log) | |
1618 | ret = test_bit(MD_HAS_JOURNAL, &conf->mddev->flags); | |
1619 | else | |
1620 | ret = test_bit(Faulty, &log->rdev->flags); | |
1621 | rcu_read_unlock(); | |
1622 | return ret; | |
6e74a9cf SL |
1623 | } |
1624 | ||
effe6ee7 SL |
1625 | #define R5L_RECOVERY_PAGE_POOL_SIZE 256 |
1626 | ||
355810d1 SL |
1627 | struct r5l_recovery_ctx { |
1628 | struct page *meta_page; /* current meta */ | |
1629 | sector_t meta_total_blocks; /* total size of current meta and data */ | |
1630 | sector_t pos; /* recovery position */ | |
1631 | u64 seq; /* recovery position seq */ | |
b4c625c6 SL |
1632 | int data_parity_stripes; /* number of data_parity stripes */ |
1633 | int data_only_stripes; /* number of data_only stripes */ | |
1634 | struct list_head cached_list; | |
effe6ee7 SL |
1635 | |
1636 | /* | |
1637 | * read ahead page pool (ra_pool) | |
1638 | * in recovery, log is read sequentially. It is not efficient to | |
1639 | * read every page with sync_page_io(). The read ahead page pool | |
1640 | * reads multiple pages with one IO, so further log read can | |
1641 | * just copy data from the pool. | |
1642 | */ | |
1643 | struct page *ra_pool[R5L_RECOVERY_PAGE_POOL_SIZE]; | |
1644 | sector_t pool_offset; /* offset of first page in the pool */ | |
1645 | int total_pages; /* total allocated pages */ | |
1646 | int valid_pages; /* pages with valid data */ | |
1647 | struct bio *ra_bio; /* bio to do the read ahead */ | |
355810d1 SL |
1648 | }; |
1649 | ||
effe6ee7 SL |
1650 | static int r5l_recovery_allocate_ra_pool(struct r5l_log *log, |
1651 | struct r5l_recovery_ctx *ctx) | |
1652 | { | |
1653 | struct page *page; | |
1654 | ||
1655 | ctx->ra_bio = bio_alloc_bioset(GFP_KERNEL, BIO_MAX_PAGES, log->bs); | |
1656 | if (!ctx->ra_bio) | |
1657 | return -ENOMEM; | |
1658 | ||
1659 | ctx->valid_pages = 0; | |
1660 | ctx->total_pages = 0; | |
1661 | while (ctx->total_pages < R5L_RECOVERY_PAGE_POOL_SIZE) { | |
1662 | page = alloc_page(GFP_KERNEL); | |
1663 | ||
1664 | if (!page) | |
1665 | break; | |
1666 | ctx->ra_pool[ctx->total_pages] = page; | |
1667 | ctx->total_pages += 1; | |
1668 | } | |
1669 | ||
1670 | if (ctx->total_pages == 0) { | |
1671 | bio_put(ctx->ra_bio); | |
1672 | return -ENOMEM; | |
1673 | } | |
1674 | ||
1675 | ctx->pool_offset = 0; | |
1676 | return 0; | |
1677 | } | |
1678 | ||
1679 | static void r5l_recovery_free_ra_pool(struct r5l_log *log, | |
1680 | struct r5l_recovery_ctx *ctx) | |
1681 | { | |
1682 | int i; | |
1683 | ||
1684 | for (i = 0; i < ctx->total_pages; ++i) | |
1685 | put_page(ctx->ra_pool[i]); | |
1686 | bio_put(ctx->ra_bio); | |
1687 | } | |
1688 | ||
1689 | /* | |
1690 | * fetch ctx->valid_pages pages from offset | |
1691 | * In normal cases, ctx->valid_pages == ctx->total_pages after the call. | |
1692 | * However, if the offset is close to the end of the journal device, | |
1693 | * ctx->valid_pages could be smaller than ctx->total_pages | |
1694 | */ | |
1695 | static int r5l_recovery_fetch_ra_pool(struct r5l_log *log, | |
1696 | struct r5l_recovery_ctx *ctx, | |
1697 | sector_t offset) | |
1698 | { | |
1699 | bio_reset(ctx->ra_bio); | |
74d46992 | 1700 | bio_set_dev(ctx->ra_bio, log->rdev->bdev); |
effe6ee7 SL |
1701 | bio_set_op_attrs(ctx->ra_bio, REQ_OP_READ, 0); |
1702 | ctx->ra_bio->bi_iter.bi_sector = log->rdev->data_offset + offset; | |
1703 | ||
1704 | ctx->valid_pages = 0; | |
1705 | ctx->pool_offset = offset; | |
1706 | ||
1707 | while (ctx->valid_pages < ctx->total_pages) { | |
1708 | bio_add_page(ctx->ra_bio, | |
1709 | ctx->ra_pool[ctx->valid_pages], PAGE_SIZE, 0); | |
1710 | ctx->valid_pages += 1; | |
1711 | ||
1712 | offset = r5l_ring_add(log, offset, BLOCK_SECTORS); | |
1713 | ||
1714 | if (offset == 0) /* reached end of the device */ | |
1715 | break; | |
1716 | } | |
1717 | ||
1718 | return submit_bio_wait(ctx->ra_bio); | |
1719 | } | |
1720 | ||
1721 | /* | |
1722 | * try read a page from the read ahead page pool, if the page is not in the | |
1723 | * pool, call r5l_recovery_fetch_ra_pool | |
1724 | */ | |
1725 | static int r5l_recovery_read_page(struct r5l_log *log, | |
1726 | struct r5l_recovery_ctx *ctx, | |
1727 | struct page *page, | |
1728 | sector_t offset) | |
1729 | { | |
1730 | int ret; | |
1731 | ||
1732 | if (offset < ctx->pool_offset || | |
1733 | offset >= ctx->pool_offset + ctx->valid_pages * BLOCK_SECTORS) { | |
1734 | ret = r5l_recovery_fetch_ra_pool(log, ctx, offset); | |
1735 | if (ret) | |
1736 | return ret; | |
1737 | } | |
1738 | ||
1739 | BUG_ON(offset < ctx->pool_offset || | |
1740 | offset >= ctx->pool_offset + ctx->valid_pages * BLOCK_SECTORS); | |
1741 | ||
1742 | memcpy(page_address(page), | |
1743 | page_address(ctx->ra_pool[(offset - ctx->pool_offset) >> | |
1744 | BLOCK_SECTOR_SHIFT]), | |
1745 | PAGE_SIZE); | |
1746 | return 0; | |
1747 | } | |
1748 | ||
9ed988f5 SL |
1749 | static int r5l_recovery_read_meta_block(struct r5l_log *log, |
1750 | struct r5l_recovery_ctx *ctx) | |
355810d1 SL |
1751 | { |
1752 | struct page *page = ctx->meta_page; | |
1753 | struct r5l_meta_block *mb; | |
1754 | u32 crc, stored_crc; | |
effe6ee7 | 1755 | int ret; |
355810d1 | 1756 | |
effe6ee7 SL |
1757 | ret = r5l_recovery_read_page(log, ctx, page, ctx->pos); |
1758 | if (ret != 0) | |
1759 | return ret; | |
355810d1 SL |
1760 | |
1761 | mb = page_address(page); | |
1762 | stored_crc = le32_to_cpu(mb->checksum); | |
1763 | mb->checksum = 0; | |
1764 | ||
1765 | if (le32_to_cpu(mb->magic) != R5LOG_MAGIC || | |
1766 | le64_to_cpu(mb->seq) != ctx->seq || | |
1767 | mb->version != R5LOG_VERSION || | |
1768 | le64_to_cpu(mb->position) != ctx->pos) | |
1769 | return -EINVAL; | |
1770 | ||
5cb2fbd6 | 1771 | crc = crc32c_le(log->uuid_checksum, mb, PAGE_SIZE); |
355810d1 SL |
1772 | if (stored_crc != crc) |
1773 | return -EINVAL; | |
1774 | ||
1775 | if (le32_to_cpu(mb->meta_size) > PAGE_SIZE) | |
1776 | return -EINVAL; | |
1777 | ||
1778 | ctx->meta_total_blocks = BLOCK_SECTORS; | |
1779 | ||
1780 | return 0; | |
1781 | } | |
1782 | ||
9ed988f5 SL |
1783 | static void |
1784 | r5l_recovery_create_empty_meta_block(struct r5l_log *log, | |
1785 | struct page *page, | |
1786 | sector_t pos, u64 seq) | |
355810d1 | 1787 | { |
355810d1 | 1788 | struct r5l_meta_block *mb; |
355810d1 | 1789 | |
355810d1 | 1790 | mb = page_address(page); |
9ed988f5 | 1791 | clear_page(mb); |
355810d1 SL |
1792 | mb->magic = cpu_to_le32(R5LOG_MAGIC); |
1793 | mb->version = R5LOG_VERSION; | |
1794 | mb->meta_size = cpu_to_le32(sizeof(struct r5l_meta_block)); | |
1795 | mb->seq = cpu_to_le64(seq); | |
1796 | mb->position = cpu_to_le64(pos); | |
9ed988f5 | 1797 | } |
355810d1 | 1798 | |
9ed988f5 SL |
1799 | static int r5l_log_write_empty_meta_block(struct r5l_log *log, sector_t pos, |
1800 | u64 seq) | |
1801 | { | |
1802 | struct page *page; | |
5c88f403 | 1803 | struct r5l_meta_block *mb; |
355810d1 | 1804 | |
9ed988f5 SL |
1805 | page = alloc_page(GFP_KERNEL); |
1806 | if (!page) | |
1807 | return -ENOMEM; | |
1808 | r5l_recovery_create_empty_meta_block(log, page, pos, seq); | |
5c88f403 SL |
1809 | mb = page_address(page); |
1810 | mb->checksum = cpu_to_le32(crc32c_le(log->uuid_checksum, | |
1811 | mb, PAGE_SIZE)); | |
796a5cf0 | 1812 | if (!sync_page_io(log->rdev, pos, PAGE_SIZE, page, REQ_OP_WRITE, |
5a8948f8 | 1813 | REQ_SYNC | REQ_FUA, false)) { |
355810d1 SL |
1814 | __free_page(page); |
1815 | return -EIO; | |
1816 | } | |
1817 | __free_page(page); | |
1818 | return 0; | |
1819 | } | |
355810d1 | 1820 | |
b4c625c6 SL |
1821 | /* |
1822 | * r5l_recovery_load_data and r5l_recovery_load_parity uses flag R5_Wantwrite | |
1823 | * to mark valid (potentially not flushed) data in the journal. | |
1824 | * | |
1825 | * We already verified checksum in r5l_recovery_verify_data_checksum_for_mb, | |
1826 | * so there should not be any mismatch here. | |
1827 | */ | |
1828 | static void r5l_recovery_load_data(struct r5l_log *log, | |
1829 | struct stripe_head *sh, | |
1830 | struct r5l_recovery_ctx *ctx, | |
1831 | struct r5l_payload_data_parity *payload, | |
1832 | sector_t log_offset) | |
1833 | { | |
1834 | struct mddev *mddev = log->rdev->mddev; | |
1835 | struct r5conf *conf = mddev->private; | |
1836 | int dd_idx; | |
1837 | ||
1838 | raid5_compute_sector(conf, | |
1839 | le64_to_cpu(payload->location), 0, | |
1840 | &dd_idx, sh); | |
effe6ee7 | 1841 | r5l_recovery_read_page(log, ctx, sh->dev[dd_idx].page, log_offset); |
b4c625c6 SL |
1842 | sh->dev[dd_idx].log_checksum = |
1843 | le32_to_cpu(payload->checksum[0]); | |
1844 | ctx->meta_total_blocks += BLOCK_SECTORS; | |
1845 | ||
1846 | set_bit(R5_Wantwrite, &sh->dev[dd_idx].flags); | |
1847 | set_bit(STRIPE_R5C_CACHING, &sh->state); | |
1848 | } | |
1849 | ||
1850 | static void r5l_recovery_load_parity(struct r5l_log *log, | |
1851 | struct stripe_head *sh, | |
1852 | struct r5l_recovery_ctx *ctx, | |
1853 | struct r5l_payload_data_parity *payload, | |
1854 | sector_t log_offset) | |
1855 | { | |
1856 | struct mddev *mddev = log->rdev->mddev; | |
1857 | struct r5conf *conf = mddev->private; | |
1858 | ||
1859 | ctx->meta_total_blocks += BLOCK_SECTORS * conf->max_degraded; | |
effe6ee7 | 1860 | r5l_recovery_read_page(log, ctx, sh->dev[sh->pd_idx].page, log_offset); |
b4c625c6 SL |
1861 | sh->dev[sh->pd_idx].log_checksum = |
1862 | le32_to_cpu(payload->checksum[0]); | |
1863 | set_bit(R5_Wantwrite, &sh->dev[sh->pd_idx].flags); | |
1864 | ||
1865 | if (sh->qd_idx >= 0) { | |
effe6ee7 SL |
1866 | r5l_recovery_read_page( |
1867 | log, ctx, sh->dev[sh->qd_idx].page, | |
1868 | r5l_ring_add(log, log_offset, BLOCK_SECTORS)); | |
b4c625c6 SL |
1869 | sh->dev[sh->qd_idx].log_checksum = |
1870 | le32_to_cpu(payload->checksum[1]); | |
1871 | set_bit(R5_Wantwrite, &sh->dev[sh->qd_idx].flags); | |
355810d1 | 1872 | } |
b4c625c6 SL |
1873 | clear_bit(STRIPE_R5C_CACHING, &sh->state); |
1874 | } | |
355810d1 | 1875 | |
b4c625c6 SL |
1876 | static void r5l_recovery_reset_stripe(struct stripe_head *sh) |
1877 | { | |
1878 | int i; | |
1879 | ||
1880 | sh->state = 0; | |
1881 | sh->log_start = MaxSector; | |
1882 | for (i = sh->disks; i--; ) | |
1883 | sh->dev[i].flags = 0; | |
1884 | } | |
1885 | ||
1886 | static void | |
1887 | r5l_recovery_replay_one_stripe(struct r5conf *conf, | |
1888 | struct stripe_head *sh, | |
1889 | struct r5l_recovery_ctx *ctx) | |
1890 | { | |
1891 | struct md_rdev *rdev, *rrdev; | |
1892 | int disk_index; | |
1893 | int data_count = 0; | |
355810d1 | 1894 | |
b4c625c6 | 1895 | for (disk_index = 0; disk_index < sh->disks; disk_index++) { |
355810d1 SL |
1896 | if (!test_bit(R5_Wantwrite, &sh->dev[disk_index].flags)) |
1897 | continue; | |
b4c625c6 SL |
1898 | if (disk_index == sh->qd_idx || disk_index == sh->pd_idx) |
1899 | continue; | |
1900 | data_count++; | |
355810d1 SL |
1901 | } |
1902 | ||
b4c625c6 SL |
1903 | /* |
1904 | * stripes that only have parity must have been flushed | |
1905 | * before the crash that we are now recovering from, so | |
1906 | * there is nothing more to recovery. | |
1907 | */ | |
1908 | if (data_count == 0) | |
1909 | goto out; | |
355810d1 | 1910 | |
b4c625c6 SL |
1911 | for (disk_index = 0; disk_index < sh->disks; disk_index++) { |
1912 | if (!test_bit(R5_Wantwrite, &sh->dev[disk_index].flags)) | |
355810d1 SL |
1913 | continue; |
1914 | ||
1915 | /* in case device is broken */ | |
b4c625c6 | 1916 | rcu_read_lock(); |
355810d1 | 1917 | rdev = rcu_dereference(conf->disks[disk_index].rdev); |
b4c625c6 SL |
1918 | if (rdev) { |
1919 | atomic_inc(&rdev->nr_pending); | |
1920 | rcu_read_unlock(); | |
1921 | sync_page_io(rdev, sh->sector, PAGE_SIZE, | |
796a5cf0 MC |
1922 | sh->dev[disk_index].page, REQ_OP_WRITE, 0, |
1923 | false); | |
b4c625c6 SL |
1924 | rdev_dec_pending(rdev, rdev->mddev); |
1925 | rcu_read_lock(); | |
1926 | } | |
355810d1 | 1927 | rrdev = rcu_dereference(conf->disks[disk_index].replacement); |
b4c625c6 SL |
1928 | if (rrdev) { |
1929 | atomic_inc(&rrdev->nr_pending); | |
1930 | rcu_read_unlock(); | |
1931 | sync_page_io(rrdev, sh->sector, PAGE_SIZE, | |
796a5cf0 MC |
1932 | sh->dev[disk_index].page, REQ_OP_WRITE, 0, |
1933 | false); | |
b4c625c6 SL |
1934 | rdev_dec_pending(rrdev, rrdev->mddev); |
1935 | rcu_read_lock(); | |
1936 | } | |
1937 | rcu_read_unlock(); | |
355810d1 | 1938 | } |
b4c625c6 SL |
1939 | ctx->data_parity_stripes++; |
1940 | out: | |
1941 | r5l_recovery_reset_stripe(sh); | |
1942 | } | |
1943 | ||
1944 | static struct stripe_head * | |
1945 | r5c_recovery_alloc_stripe(struct r5conf *conf, | |
3c66abba | 1946 | sector_t stripe_sect) |
b4c625c6 SL |
1947 | { |
1948 | struct stripe_head *sh; | |
1949 | ||
1950 | sh = raid5_get_active_stripe(conf, stripe_sect, 0, 1, 0); | |
1951 | if (!sh) | |
1952 | return NULL; /* no more stripe available */ | |
1953 | ||
1954 | r5l_recovery_reset_stripe(sh); | |
b4c625c6 SL |
1955 | |
1956 | return sh; | |
1957 | } | |
1958 | ||
1959 | static struct stripe_head * | |
1960 | r5c_recovery_lookup_stripe(struct list_head *list, sector_t sect) | |
1961 | { | |
1962 | struct stripe_head *sh; | |
1963 | ||
1964 | list_for_each_entry(sh, list, lru) | |
1965 | if (sh->sector == sect) | |
1966 | return sh; | |
1967 | return NULL; | |
1968 | } | |
1969 | ||
1970 | static void | |
1971 | r5c_recovery_drop_stripes(struct list_head *cached_stripe_list, | |
1972 | struct r5l_recovery_ctx *ctx) | |
1973 | { | |
1974 | struct stripe_head *sh, *next; | |
1975 | ||
1976 | list_for_each_entry_safe(sh, next, cached_stripe_list, lru) { | |
1977 | r5l_recovery_reset_stripe(sh); | |
1978 | list_del_init(&sh->lru); | |
1979 | raid5_release_stripe(sh); | |
1980 | } | |
1981 | } | |
1982 | ||
1983 | static void | |
1984 | r5c_recovery_replay_stripes(struct list_head *cached_stripe_list, | |
1985 | struct r5l_recovery_ctx *ctx) | |
1986 | { | |
1987 | struct stripe_head *sh, *next; | |
1988 | ||
1989 | list_for_each_entry_safe(sh, next, cached_stripe_list, lru) | |
1990 | if (!test_bit(STRIPE_R5C_CACHING, &sh->state)) { | |
1991 | r5l_recovery_replay_one_stripe(sh->raid_conf, sh, ctx); | |
1992 | list_del_init(&sh->lru); | |
1993 | raid5_release_stripe(sh); | |
1994 | } | |
1995 | } | |
1996 | ||
1997 | /* if matches return 0; otherwise return -EINVAL */ | |
1998 | static int | |
effe6ee7 SL |
1999 | r5l_recovery_verify_data_checksum(struct r5l_log *log, |
2000 | struct r5l_recovery_ctx *ctx, | |
2001 | struct page *page, | |
b4c625c6 SL |
2002 | sector_t log_offset, __le32 log_checksum) |
2003 | { | |
2004 | void *addr; | |
2005 | u32 checksum; | |
2006 | ||
effe6ee7 | 2007 | r5l_recovery_read_page(log, ctx, page, log_offset); |
b4c625c6 SL |
2008 | addr = kmap_atomic(page); |
2009 | checksum = crc32c_le(log->uuid_checksum, addr, PAGE_SIZE); | |
2010 | kunmap_atomic(addr); | |
2011 | return (le32_to_cpu(log_checksum) == checksum) ? 0 : -EINVAL; | |
2012 | } | |
2013 | ||
2014 | /* | |
2015 | * before loading data to stripe cache, we need verify checksum for all data, | |
2016 | * if there is mismatch for any data page, we drop all data in the mata block | |
2017 | */ | |
2018 | static int | |
2019 | r5l_recovery_verify_data_checksum_for_mb(struct r5l_log *log, | |
2020 | struct r5l_recovery_ctx *ctx) | |
2021 | { | |
2022 | struct mddev *mddev = log->rdev->mddev; | |
2023 | struct r5conf *conf = mddev->private; | |
2024 | struct r5l_meta_block *mb = page_address(ctx->meta_page); | |
2025 | sector_t mb_offset = sizeof(struct r5l_meta_block); | |
2026 | sector_t log_offset = r5l_ring_add(log, ctx->pos, BLOCK_SECTORS); | |
2027 | struct page *page; | |
2028 | struct r5l_payload_data_parity *payload; | |
2d4f4687 | 2029 | struct r5l_payload_flush *payload_flush; |
b4c625c6 SL |
2030 | |
2031 | page = alloc_page(GFP_KERNEL); | |
2032 | if (!page) | |
2033 | return -ENOMEM; | |
2034 | ||
2035 | while (mb_offset < le32_to_cpu(mb->meta_size)) { | |
2036 | payload = (void *)mb + mb_offset; | |
2d4f4687 | 2037 | payload_flush = (void *)mb + mb_offset; |
b4c625c6 | 2038 | |
1ad45a9b | 2039 | if (le16_to_cpu(payload->header.type) == R5LOG_PAYLOAD_DATA) { |
b4c625c6 | 2040 | if (r5l_recovery_verify_data_checksum( |
effe6ee7 | 2041 | log, ctx, page, log_offset, |
b4c625c6 SL |
2042 | payload->checksum[0]) < 0) |
2043 | goto mismatch; | |
1ad45a9b | 2044 | } else if (le16_to_cpu(payload->header.type) == R5LOG_PAYLOAD_PARITY) { |
b4c625c6 | 2045 | if (r5l_recovery_verify_data_checksum( |
effe6ee7 | 2046 | log, ctx, page, log_offset, |
b4c625c6 SL |
2047 | payload->checksum[0]) < 0) |
2048 | goto mismatch; | |
2049 | if (conf->max_degraded == 2 && /* q for RAID 6 */ | |
2050 | r5l_recovery_verify_data_checksum( | |
effe6ee7 | 2051 | log, ctx, page, |
b4c625c6 SL |
2052 | r5l_ring_add(log, log_offset, |
2053 | BLOCK_SECTORS), | |
2054 | payload->checksum[1]) < 0) | |
2055 | goto mismatch; | |
1ad45a9b | 2056 | } else if (le16_to_cpu(payload->header.type) == R5LOG_PAYLOAD_FLUSH) { |
2d4f4687 SL |
2057 | /* nothing to do for R5LOG_PAYLOAD_FLUSH here */ |
2058 | } else /* not R5LOG_PAYLOAD_DATA/PARITY/FLUSH */ | |
b4c625c6 SL |
2059 | goto mismatch; |
2060 | ||
1ad45a9b | 2061 | if (le16_to_cpu(payload->header.type) == R5LOG_PAYLOAD_FLUSH) { |
2d4f4687 SL |
2062 | mb_offset += sizeof(struct r5l_payload_flush) + |
2063 | le32_to_cpu(payload_flush->size); | |
2064 | } else { | |
2065 | /* DATA or PARITY payload */ | |
2066 | log_offset = r5l_ring_add(log, log_offset, | |
2067 | le32_to_cpu(payload->size)); | |
2068 | mb_offset += sizeof(struct r5l_payload_data_parity) + | |
2069 | sizeof(__le32) * | |
2070 | (le32_to_cpu(payload->size) >> (PAGE_SHIFT - 9)); | |
2071 | } | |
b4c625c6 | 2072 | |
b4c625c6 SL |
2073 | } |
2074 | ||
2075 | put_page(page); | |
355810d1 SL |
2076 | return 0; |
2077 | ||
b4c625c6 SL |
2078 | mismatch: |
2079 | put_page(page); | |
355810d1 SL |
2080 | return -EINVAL; |
2081 | } | |
2082 | ||
b4c625c6 SL |
2083 | /* |
2084 | * Analyze all data/parity pages in one meta block | |
2085 | * Returns: | |
2086 | * 0 for success | |
2087 | * -EINVAL for unknown playload type | |
2088 | * -EAGAIN for checksum mismatch of data page | |
2089 | * -ENOMEM for run out of memory (alloc_page failed or run out of stripes) | |
2090 | */ | |
2091 | static int | |
2092 | r5c_recovery_analyze_meta_block(struct r5l_log *log, | |
2093 | struct r5l_recovery_ctx *ctx, | |
2094 | struct list_head *cached_stripe_list) | |
355810d1 | 2095 | { |
b4c625c6 SL |
2096 | struct mddev *mddev = log->rdev->mddev; |
2097 | struct r5conf *conf = mddev->private; | |
355810d1 | 2098 | struct r5l_meta_block *mb; |
b4c625c6 | 2099 | struct r5l_payload_data_parity *payload; |
2d4f4687 | 2100 | struct r5l_payload_flush *payload_flush; |
b4c625c6 | 2101 | int mb_offset; |
355810d1 | 2102 | sector_t log_offset; |
b4c625c6 SL |
2103 | sector_t stripe_sect; |
2104 | struct stripe_head *sh; | |
2105 | int ret; | |
2106 | ||
2107 | /* | |
2108 | * for mismatch in data blocks, we will drop all data in this mb, but | |
2109 | * we will still read next mb for other data with FLUSH flag, as | |
2110 | * io_unit could finish out of order. | |
2111 | */ | |
2112 | ret = r5l_recovery_verify_data_checksum_for_mb(log, ctx); | |
2113 | if (ret == -EINVAL) | |
2114 | return -EAGAIN; | |
2115 | else if (ret) | |
2116 | return ret; /* -ENOMEM duo to alloc_page() failed */ | |
355810d1 SL |
2117 | |
2118 | mb = page_address(ctx->meta_page); | |
b4c625c6 | 2119 | mb_offset = sizeof(struct r5l_meta_block); |
355810d1 SL |
2120 | log_offset = r5l_ring_add(log, ctx->pos, BLOCK_SECTORS); |
2121 | ||
b4c625c6 | 2122 | while (mb_offset < le32_to_cpu(mb->meta_size)) { |
355810d1 SL |
2123 | int dd; |
2124 | ||
b4c625c6 | 2125 | payload = (void *)mb + mb_offset; |
2d4f4687 SL |
2126 | payload_flush = (void *)mb + mb_offset; |
2127 | ||
1ad45a9b | 2128 | if (le16_to_cpu(payload->header.type) == R5LOG_PAYLOAD_FLUSH) { |
2d4f4687 SL |
2129 | int i, count; |
2130 | ||
2131 | count = le32_to_cpu(payload_flush->size) / sizeof(__le64); | |
2132 | for (i = 0; i < count; ++i) { | |
2133 | stripe_sect = le64_to_cpu(payload_flush->flush_stripes[i]); | |
2134 | sh = r5c_recovery_lookup_stripe(cached_stripe_list, | |
2135 | stripe_sect); | |
2136 | if (sh) { | |
2137 | WARN_ON(test_bit(STRIPE_R5C_CACHING, &sh->state)); | |
2138 | r5l_recovery_reset_stripe(sh); | |
2139 | list_del_init(&sh->lru); | |
2140 | raid5_release_stripe(sh); | |
2141 | } | |
2142 | } | |
2143 | ||
2144 | mb_offset += sizeof(struct r5l_payload_flush) + | |
2145 | le32_to_cpu(payload_flush->size); | |
2146 | continue; | |
2147 | } | |
2148 | ||
2149 | /* DATA or PARITY payload */ | |
1ad45a9b | 2150 | stripe_sect = (le16_to_cpu(payload->header.type) == R5LOG_PAYLOAD_DATA) ? |
b4c625c6 SL |
2151 | raid5_compute_sector( |
2152 | conf, le64_to_cpu(payload->location), 0, &dd, | |
2153 | NULL) | |
2154 | : le64_to_cpu(payload->location); | |
2155 | ||
2156 | sh = r5c_recovery_lookup_stripe(cached_stripe_list, | |
2157 | stripe_sect); | |
2158 | ||
2159 | if (!sh) { | |
3c66abba | 2160 | sh = r5c_recovery_alloc_stripe(conf, stripe_sect); |
b4c625c6 SL |
2161 | /* |
2162 | * cannot get stripe from raid5_get_active_stripe | |
2163 | * try replay some stripes | |
2164 | */ | |
2165 | if (!sh) { | |
2166 | r5c_recovery_replay_stripes( | |
2167 | cached_stripe_list, ctx); | |
2168 | sh = r5c_recovery_alloc_stripe( | |
3c66abba | 2169 | conf, stripe_sect); |
b4c625c6 SL |
2170 | } |
2171 | if (!sh) { | |
2172 | pr_debug("md/raid:%s: Increasing stripe cache size to %d to recovery data on journal.\n", | |
2173 | mdname(mddev), | |
2174 | conf->min_nr_stripes * 2); | |
2175 | raid5_set_cache_size(mddev, | |
2176 | conf->min_nr_stripes * 2); | |
3c66abba SL |
2177 | sh = r5c_recovery_alloc_stripe(conf, |
2178 | stripe_sect); | |
b4c625c6 SL |
2179 | } |
2180 | if (!sh) { | |
2181 | pr_err("md/raid:%s: Cannot get enough stripes due to memory pressure. Recovery failed.\n", | |
2182 | mdname(mddev)); | |
2183 | return -ENOMEM; | |
2184 | } | |
2185 | list_add_tail(&sh->lru, cached_stripe_list); | |
2186 | } | |
2187 | ||
1ad45a9b | 2188 | if (le16_to_cpu(payload->header.type) == R5LOG_PAYLOAD_DATA) { |
f7b7bee7 ZL |
2189 | if (!test_bit(STRIPE_R5C_CACHING, &sh->state) && |
2190 | test_bit(R5_Wantwrite, &sh->dev[sh->pd_idx].flags)) { | |
b4c625c6 | 2191 | r5l_recovery_replay_one_stripe(conf, sh, ctx); |
b4c625c6 SL |
2192 | list_move_tail(&sh->lru, cached_stripe_list); |
2193 | } | |
2194 | r5l_recovery_load_data(log, sh, ctx, payload, | |
2195 | log_offset); | |
1ad45a9b | 2196 | } else if (le16_to_cpu(payload->header.type) == R5LOG_PAYLOAD_PARITY) |
b4c625c6 SL |
2197 | r5l_recovery_load_parity(log, sh, ctx, payload, |
2198 | log_offset); | |
2199 | else | |
355810d1 | 2200 | return -EINVAL; |
b4c625c6 SL |
2201 | |
2202 | log_offset = r5l_ring_add(log, log_offset, | |
2203 | le32_to_cpu(payload->size)); | |
2204 | ||
2205 | mb_offset += sizeof(struct r5l_payload_data_parity) + | |
2206 | sizeof(__le32) * | |
2207 | (le32_to_cpu(payload->size) >> (PAGE_SHIFT - 9)); | |
355810d1 | 2208 | } |
b4c625c6 | 2209 | |
355810d1 SL |
2210 | return 0; |
2211 | } | |
2212 | ||
b4c625c6 SL |
2213 | /* |
2214 | * Load the stripe into cache. The stripe will be written out later by | |
2215 | * the stripe cache state machine. | |
2216 | */ | |
2217 | static void r5c_recovery_load_one_stripe(struct r5l_log *log, | |
2218 | struct stripe_head *sh) | |
355810d1 | 2219 | { |
b4c625c6 SL |
2220 | struct r5dev *dev; |
2221 | int i; | |
2222 | ||
2223 | for (i = sh->disks; i--; ) { | |
2224 | dev = sh->dev + i; | |
2225 | if (test_and_clear_bit(R5_Wantwrite, &dev->flags)) { | |
2226 | set_bit(R5_InJournal, &dev->flags); | |
2227 | set_bit(R5_UPTODATE, &dev->flags); | |
2228 | } | |
2229 | } | |
b4c625c6 SL |
2230 | } |
2231 | ||
2232 | /* | |
2233 | * Scan through the log for all to-be-flushed data | |
2234 | * | |
2235 | * For stripes with data and parity, namely Data-Parity stripe | |
2236 | * (STRIPE_R5C_CACHING == 0), we simply replay all the writes. | |
2237 | * | |
2238 | * For stripes with only data, namely Data-Only stripe | |
2239 | * (STRIPE_R5C_CACHING == 1), we load them to stripe cache state machine. | |
2240 | * | |
2241 | * For a stripe, if we see data after parity, we should discard all previous | |
2242 | * data and parity for this stripe, as these data are already flushed to | |
2243 | * the array. | |
2244 | * | |
2245 | * At the end of the scan, we return the new journal_tail, which points to | |
2246 | * first data-only stripe on the journal device, or next invalid meta block. | |
2247 | */ | |
2248 | static int r5c_recovery_flush_log(struct r5l_log *log, | |
2249 | struct r5l_recovery_ctx *ctx) | |
2250 | { | |
bc8f167f | 2251 | struct stripe_head *sh; |
b4c625c6 SL |
2252 | int ret = 0; |
2253 | ||
2254 | /* scan through the log */ | |
355810d1 | 2255 | while (1) { |
b4c625c6 SL |
2256 | if (r5l_recovery_read_meta_block(log, ctx)) |
2257 | break; | |
2258 | ||
2259 | ret = r5c_recovery_analyze_meta_block(log, ctx, | |
2260 | &ctx->cached_list); | |
2261 | /* | |
2262 | * -EAGAIN means mismatch in data block, in this case, we still | |
2263 | * try scan the next metablock | |
2264 | */ | |
2265 | if (ret && ret != -EAGAIN) | |
2266 | break; /* ret == -EINVAL or -ENOMEM */ | |
355810d1 SL |
2267 | ctx->seq++; |
2268 | ctx->pos = r5l_ring_add(log, ctx->pos, ctx->meta_total_blocks); | |
2269 | } | |
b4c625c6 SL |
2270 | |
2271 | if (ret == -ENOMEM) { | |
2272 | r5c_recovery_drop_stripes(&ctx->cached_list, ctx); | |
2273 | return ret; | |
2274 | } | |
2275 | ||
2276 | /* replay data-parity stripes */ | |
2277 | r5c_recovery_replay_stripes(&ctx->cached_list, ctx); | |
2278 | ||
2279 | /* load data-only stripes to stripe cache */ | |
bc8f167f | 2280 | list_for_each_entry(sh, &ctx->cached_list, lru) { |
b4c625c6 SL |
2281 | WARN_ON(!test_bit(STRIPE_R5C_CACHING, &sh->state)); |
2282 | r5c_recovery_load_one_stripe(log, sh); | |
b4c625c6 SL |
2283 | ctx->data_only_stripes++; |
2284 | } | |
2285 | ||
2286 | return 0; | |
355810d1 SL |
2287 | } |
2288 | ||
b4c625c6 SL |
2289 | /* |
2290 | * we did a recovery. Now ctx.pos points to an invalid meta block. New | |
2291 | * log will start here. but we can't let superblock point to last valid | |
2292 | * meta block. The log might looks like: | |
2293 | * | meta 1| meta 2| meta 3| | |
2294 | * meta 1 is valid, meta 2 is invalid. meta 3 could be valid. If | |
2295 | * superblock points to meta 1, we write a new valid meta 2n. if crash | |
2296 | * happens again, new recovery will start from meta 1. Since meta 2n is | |
2297 | * valid now, recovery will think meta 3 is valid, which is wrong. | |
2298 | * The solution is we create a new meta in meta2 with its seq == meta | |
3c6edc66 SL |
2299 | * 1's seq + 10000 and let superblock points to meta2. The same recovery |
2300 | * will not think meta 3 is a valid meta, because its seq doesn't match | |
b4c625c6 SL |
2301 | */ |
2302 | ||
2303 | /* | |
2304 | * Before recovery, the log looks like the following | |
2305 | * | |
2306 | * --------------------------------------------- | |
2307 | * | valid log | invalid log | | |
2308 | * --------------------------------------------- | |
2309 | * ^ | |
2310 | * |- log->last_checkpoint | |
2311 | * |- log->last_cp_seq | |
2312 | * | |
2313 | * Now we scan through the log until we see invalid entry | |
2314 | * | |
2315 | * --------------------------------------------- | |
2316 | * | valid log | invalid log | | |
2317 | * --------------------------------------------- | |
2318 | * ^ ^ | |
2319 | * |- log->last_checkpoint |- ctx->pos | |
2320 | * |- log->last_cp_seq |- ctx->seq | |
2321 | * | |
2322 | * From this point, we need to increase seq number by 10 to avoid | |
2323 | * confusing next recovery. | |
2324 | * | |
2325 | * --------------------------------------------- | |
2326 | * | valid log | invalid log | | |
2327 | * --------------------------------------------- | |
2328 | * ^ ^ | |
2329 | * |- log->last_checkpoint |- ctx->pos+1 | |
3c6edc66 | 2330 | * |- log->last_cp_seq |- ctx->seq+10001 |
b4c625c6 SL |
2331 | * |
2332 | * However, it is not safe to start the state machine yet, because data only | |
2333 | * parities are not yet secured in RAID. To save these data only parities, we | |
2334 | * rewrite them from seq+11. | |
2335 | * | |
2336 | * ----------------------------------------------------------------- | |
2337 | * | valid log | data only stripes | invalid log | | |
2338 | * ----------------------------------------------------------------- | |
2339 | * ^ ^ | |
2340 | * |- log->last_checkpoint |- ctx->pos+n | |
3c6edc66 | 2341 | * |- log->last_cp_seq |- ctx->seq+10000+n |
b4c625c6 SL |
2342 | * |
2343 | * If failure happens again during this process, the recovery can safe start | |
2344 | * again from log->last_checkpoint. | |
2345 | * | |
2346 | * Once data only stripes are rewritten to journal, we move log_tail | |
2347 | * | |
2348 | * ----------------------------------------------------------------- | |
2349 | * | old log | data only stripes | invalid log | | |
2350 | * ----------------------------------------------------------------- | |
2351 | * ^ ^ | |
2352 | * |- log->last_checkpoint |- ctx->pos+n | |
3c6edc66 | 2353 | * |- log->last_cp_seq |- ctx->seq+10000+n |
b4c625c6 SL |
2354 | * |
2355 | * Then we can safely start the state machine. If failure happens from this | |
2356 | * point on, the recovery will start from new log->last_checkpoint. | |
2357 | */ | |
2358 | static int | |
2359 | r5c_recovery_rewrite_data_only_stripes(struct r5l_log *log, | |
2360 | struct r5l_recovery_ctx *ctx) | |
355810d1 | 2361 | { |
a85dd7b8 | 2362 | struct stripe_head *sh; |
b4c625c6 | 2363 | struct mddev *mddev = log->rdev->mddev; |
355810d1 | 2364 | struct page *page; |
3c66abba | 2365 | sector_t next_checkpoint = MaxSector; |
355810d1 | 2366 | |
b4c625c6 SL |
2367 | page = alloc_page(GFP_KERNEL); |
2368 | if (!page) { | |
2369 | pr_err("md/raid:%s: cannot allocate memory to rewrite data only stripes\n", | |
2370 | mdname(mddev)); | |
355810d1 | 2371 | return -ENOMEM; |
b4c625c6 | 2372 | } |
355810d1 | 2373 | |
3c66abba SL |
2374 | WARN_ON(list_empty(&ctx->cached_list)); |
2375 | ||
a85dd7b8 | 2376 | list_for_each_entry(sh, &ctx->cached_list, lru) { |
b4c625c6 SL |
2377 | struct r5l_meta_block *mb; |
2378 | int i; | |
2379 | int offset; | |
2380 | sector_t write_pos; | |
2381 | ||
2382 | WARN_ON(!test_bit(STRIPE_R5C_CACHING, &sh->state)); | |
2383 | r5l_recovery_create_empty_meta_block(log, page, | |
2384 | ctx->pos, ctx->seq); | |
2385 | mb = page_address(page); | |
2386 | offset = le32_to_cpu(mb->meta_size); | |
fc833c2a | 2387 | write_pos = r5l_ring_add(log, ctx->pos, BLOCK_SECTORS); |
b4c625c6 SL |
2388 | |
2389 | for (i = sh->disks; i--; ) { | |
2390 | struct r5dev *dev = &sh->dev[i]; | |
2391 | struct r5l_payload_data_parity *payload; | |
2392 | void *addr; | |
2393 | ||
2394 | if (test_bit(R5_InJournal, &dev->flags)) { | |
2395 | payload = (void *)mb + offset; | |
2396 | payload->header.type = cpu_to_le16( | |
2397 | R5LOG_PAYLOAD_DATA); | |
1ad45a9b | 2398 | payload->size = cpu_to_le32(BLOCK_SECTORS); |
b4c625c6 SL |
2399 | payload->location = cpu_to_le64( |
2400 | raid5_compute_blocknr(sh, i, 0)); | |
2401 | addr = kmap_atomic(dev->page); | |
2402 | payload->checksum[0] = cpu_to_le32( | |
2403 | crc32c_le(log->uuid_checksum, addr, | |
2404 | PAGE_SIZE)); | |
2405 | kunmap_atomic(addr); | |
2406 | sync_page_io(log->rdev, write_pos, PAGE_SIZE, | |
2407 | dev->page, REQ_OP_WRITE, 0, false); | |
2408 | write_pos = r5l_ring_add(log, write_pos, | |
2409 | BLOCK_SECTORS); | |
2410 | offset += sizeof(__le32) + | |
2411 | sizeof(struct r5l_payload_data_parity); | |
2412 | ||
2413 | } | |
2414 | } | |
2415 | mb->meta_size = cpu_to_le32(offset); | |
5c88f403 SL |
2416 | mb->checksum = cpu_to_le32(crc32c_le(log->uuid_checksum, |
2417 | mb, PAGE_SIZE)); | |
b4c625c6 | 2418 | sync_page_io(log->rdev, ctx->pos, PAGE_SIZE, page, |
5a8948f8 | 2419 | REQ_OP_WRITE, REQ_SYNC | REQ_FUA, false); |
b4c625c6 | 2420 | sh->log_start = ctx->pos; |
3c66abba SL |
2421 | list_add_tail(&sh->r5c, &log->stripe_in_journal_list); |
2422 | atomic_inc(&log->stripe_in_journal_count); | |
b4c625c6 SL |
2423 | ctx->pos = write_pos; |
2424 | ctx->seq += 1; | |
3c66abba | 2425 | next_checkpoint = sh->log_start; |
355810d1 | 2426 | } |
3c66abba | 2427 | log->next_checkpoint = next_checkpoint; |
355810d1 SL |
2428 | __free_page(page); |
2429 | return 0; | |
2430 | } | |
2431 | ||
a85dd7b8 SL |
2432 | static void r5c_recovery_flush_data_only_stripes(struct r5l_log *log, |
2433 | struct r5l_recovery_ctx *ctx) | |
2434 | { | |
2435 | struct mddev *mddev = log->rdev->mddev; | |
2436 | struct r5conf *conf = mddev->private; | |
2437 | struct stripe_head *sh, *next; | |
2438 | ||
2439 | if (ctx->data_only_stripes == 0) | |
2440 | return; | |
2441 | ||
2442 | log->r5c_journal_mode = R5C_JOURNAL_MODE_WRITE_BACK; | |
2443 | ||
2444 | list_for_each_entry_safe(sh, next, &ctx->cached_list, lru) { | |
2445 | r5c_make_stripe_write_out(sh); | |
2446 | set_bit(STRIPE_HANDLE, &sh->state); | |
2447 | list_del_init(&sh->lru); | |
2448 | raid5_release_stripe(sh); | |
2449 | } | |
2450 | ||
2451 | md_wakeup_thread(conf->mddev->thread); | |
2452 | /* reuse conf->wait_for_quiescent in recovery */ | |
2453 | wait_event(conf->wait_for_quiescent, | |
2454 | atomic_read(&conf->active_stripes) == 0); | |
2455 | ||
2456 | log->r5c_journal_mode = R5C_JOURNAL_MODE_WRITE_THROUGH; | |
2457 | } | |
2458 | ||
f6bed0ef SL |
2459 | static int r5l_recovery_log(struct r5l_log *log) |
2460 | { | |
5aabf7c4 | 2461 | struct mddev *mddev = log->rdev->mddev; |
effe6ee7 | 2462 | struct r5l_recovery_ctx *ctx; |
5aabf7c4 | 2463 | int ret; |
43b96748 | 2464 | sector_t pos; |
355810d1 | 2465 | |
effe6ee7 SL |
2466 | ctx = kzalloc(sizeof(*ctx), GFP_KERNEL); |
2467 | if (!ctx) | |
355810d1 SL |
2468 | return -ENOMEM; |
2469 | ||
effe6ee7 SL |
2470 | ctx->pos = log->last_checkpoint; |
2471 | ctx->seq = log->last_cp_seq; | |
2472 | INIT_LIST_HEAD(&ctx->cached_list); | |
2473 | ctx->meta_page = alloc_page(GFP_KERNEL); | |
355810d1 | 2474 | |
effe6ee7 SL |
2475 | if (!ctx->meta_page) { |
2476 | ret = -ENOMEM; | |
2477 | goto meta_page; | |
2478 | } | |
b4c625c6 | 2479 | |
effe6ee7 SL |
2480 | if (r5l_recovery_allocate_ra_pool(log, ctx) != 0) { |
2481 | ret = -ENOMEM; | |
2482 | goto ra_pool; | |
2483 | } | |
2484 | ||
2485 | ret = r5c_recovery_flush_log(log, ctx); | |
2486 | ||
2487 | if (ret) | |
2488 | goto error; | |
43b96748 | 2489 | |
effe6ee7 SL |
2490 | pos = ctx->pos; |
2491 | ctx->seq += 10000; | |
43b96748 | 2492 | |
effe6ee7 | 2493 | if ((ctx->data_only_stripes == 0) && (ctx->data_parity_stripes == 0)) |
5aabf7c4 SL |
2494 | pr_debug("md/raid:%s: starting from clean shutdown\n", |
2495 | mdname(mddev)); | |
a85dd7b8 | 2496 | else |
99f17890 | 2497 | pr_debug("md/raid:%s: recovering %d data-only stripes and %d data-parity stripes\n", |
effe6ee7 SL |
2498 | mdname(mddev), ctx->data_only_stripes, |
2499 | ctx->data_parity_stripes); | |
2500 | ||
2501 | if (ctx->data_only_stripes == 0) { | |
2502 | log->next_checkpoint = ctx->pos; | |
2503 | r5l_log_write_empty_meta_block(log, ctx->pos, ctx->seq++); | |
2504 | ctx->pos = r5l_ring_add(log, ctx->pos, BLOCK_SECTORS); | |
2505 | } else if (r5c_recovery_rewrite_data_only_stripes(log, ctx)) { | |
a85dd7b8 SL |
2506 | pr_err("md/raid:%s: failed to rewrite stripes to journal\n", |
2507 | mdname(mddev)); | |
effe6ee7 SL |
2508 | ret = -EIO; |
2509 | goto error; | |
b4c625c6 SL |
2510 | } |
2511 | ||
effe6ee7 SL |
2512 | log->log_start = ctx->pos; |
2513 | log->seq = ctx->seq; | |
43b96748 J |
2514 | log->last_checkpoint = pos; |
2515 | r5l_write_super(log, pos); | |
a85dd7b8 | 2516 | |
effe6ee7 SL |
2517 | r5c_recovery_flush_data_only_stripes(log, ctx); |
2518 | ret = 0; | |
2519 | error: | |
2520 | r5l_recovery_free_ra_pool(log, ctx); | |
2521 | ra_pool: | |
2522 | __free_page(ctx->meta_page); | |
2523 | meta_page: | |
2524 | kfree(ctx); | |
2525 | return ret; | |
f6bed0ef SL |
2526 | } |
2527 | ||
2528 | static void r5l_write_super(struct r5l_log *log, sector_t cp) | |
2529 | { | |
2530 | struct mddev *mddev = log->rdev->mddev; | |
2531 | ||
2532 | log->rdev->journal_tail = cp; | |
2953079c | 2533 | set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags); |
f6bed0ef SL |
2534 | } |
2535 | ||
2c7da14b SL |
2536 | static ssize_t r5c_journal_mode_show(struct mddev *mddev, char *page) |
2537 | { | |
a72cbf83 | 2538 | struct r5conf *conf; |
2c7da14b SL |
2539 | int ret; |
2540 | ||
a72cbf83 SL |
2541 | ret = mddev_lock(mddev); |
2542 | if (ret) | |
2543 | return ret; | |
2544 | ||
2545 | conf = mddev->private; | |
2546 | if (!conf || !conf->log) { | |
2547 | mddev_unlock(mddev); | |
2c7da14b | 2548 | return 0; |
a72cbf83 | 2549 | } |
2c7da14b SL |
2550 | |
2551 | switch (conf->log->r5c_journal_mode) { | |
2552 | case R5C_JOURNAL_MODE_WRITE_THROUGH: | |
2553 | ret = snprintf( | |
2554 | page, PAGE_SIZE, "[%s] %s\n", | |
2555 | r5c_journal_mode_str[R5C_JOURNAL_MODE_WRITE_THROUGH], | |
2556 | r5c_journal_mode_str[R5C_JOURNAL_MODE_WRITE_BACK]); | |
2557 | break; | |
2558 | case R5C_JOURNAL_MODE_WRITE_BACK: | |
2559 | ret = snprintf( | |
2560 | page, PAGE_SIZE, "%s [%s]\n", | |
2561 | r5c_journal_mode_str[R5C_JOURNAL_MODE_WRITE_THROUGH], | |
2562 | r5c_journal_mode_str[R5C_JOURNAL_MODE_WRITE_BACK]); | |
2563 | break; | |
2564 | default: | |
2565 | ret = 0; | |
2566 | } | |
a72cbf83 | 2567 | mddev_unlock(mddev); |
2c7da14b SL |
2568 | return ret; |
2569 | } | |
2570 | ||
78e470c2 HM |
2571 | /* |
2572 | * Set journal cache mode on @mddev (external API initially needed by dm-raid). | |
2573 | * | |
2574 | * @mode as defined in 'enum r5c_journal_mode'. | |
2575 | * | |
2576 | */ | |
2577 | int r5c_journal_mode_set(struct mddev *mddev, int mode) | |
2c7da14b | 2578 | { |
b44886c5 SL |
2579 | struct r5conf *conf; |
2580 | int err; | |
2c7da14b | 2581 | |
78e470c2 HM |
2582 | if (mode < R5C_JOURNAL_MODE_WRITE_THROUGH || |
2583 | mode > R5C_JOURNAL_MODE_WRITE_BACK) | |
2c7da14b SL |
2584 | return -EINVAL; |
2585 | ||
b44886c5 SL |
2586 | err = mddev_lock(mddev); |
2587 | if (err) | |
2588 | return err; | |
2589 | conf = mddev->private; | |
2590 | if (!conf || !conf->log) { | |
2591 | mddev_unlock(mddev); | |
2592 | return -ENODEV; | |
2593 | } | |
2594 | ||
2e38a37f | 2595 | if (raid5_calc_degraded(conf) > 0 && |
b44886c5 SL |
2596 | mode == R5C_JOURNAL_MODE_WRITE_BACK) { |
2597 | mddev_unlock(mddev); | |
2e38a37f | 2598 | return -EINVAL; |
b44886c5 | 2599 | } |
2e38a37f | 2600 | |
2c7da14b | 2601 | mddev_suspend(mddev); |
78e470c2 | 2602 | conf->log->r5c_journal_mode = mode; |
2c7da14b | 2603 | mddev_resume(mddev); |
b44886c5 | 2604 | mddev_unlock(mddev); |
2c7da14b SL |
2605 | |
2606 | pr_debug("md/raid:%s: setting r5c cache mode to %d: %s\n", | |
78e470c2 HM |
2607 | mdname(mddev), mode, r5c_journal_mode_str[mode]); |
2608 | return 0; | |
2609 | } | |
2610 | EXPORT_SYMBOL(r5c_journal_mode_set); | |
2611 | ||
2612 | static ssize_t r5c_journal_mode_store(struct mddev *mddev, | |
2613 | const char *page, size_t length) | |
2614 | { | |
2615 | int mode = ARRAY_SIZE(r5c_journal_mode_str); | |
2616 | size_t len = length; | |
2617 | ||
2618 | if (len < 2) | |
2619 | return -EINVAL; | |
2620 | ||
2621 | if (page[len - 1] == '\n') | |
2622 | len--; | |
2623 | ||
2624 | while (mode--) | |
2625 | if (strlen(r5c_journal_mode_str[mode]) == len && | |
2626 | !strncmp(page, r5c_journal_mode_str[mode], len)) | |
2627 | break; | |
2628 | ||
2629 | return r5c_journal_mode_set(mddev, mode) ?: length; | |
2c7da14b SL |
2630 | } |
2631 | ||
2632 | struct md_sysfs_entry | |
2633 | r5c_journal_mode = __ATTR(journal_mode, 0644, | |
2634 | r5c_journal_mode_show, r5c_journal_mode_store); | |
2635 | ||
2ded3703 SL |
2636 | /* |
2637 | * Try handle write operation in caching phase. This function should only | |
2638 | * be called in write-back mode. | |
2639 | * | |
2640 | * If all outstanding writes can be handled in caching phase, returns 0 | |
2641 | * If writes requires write-out phase, call r5c_make_stripe_write_out() | |
2642 | * and returns -EAGAIN | |
2643 | */ | |
2644 | int r5c_try_caching_write(struct r5conf *conf, | |
2645 | struct stripe_head *sh, | |
2646 | struct stripe_head_state *s, | |
2647 | int disks) | |
2648 | { | |
2649 | struct r5l_log *log = conf->log; | |
1e6d690b SL |
2650 | int i; |
2651 | struct r5dev *dev; | |
2652 | int to_cache = 0; | |
03b047f4 SL |
2653 | void **pslot; |
2654 | sector_t tree_index; | |
2655 | int ret; | |
2656 | uintptr_t refcount; | |
2ded3703 SL |
2657 | |
2658 | BUG_ON(!r5c_is_writeback(log)); | |
2659 | ||
1e6d690b SL |
2660 | if (!test_bit(STRIPE_R5C_CACHING, &sh->state)) { |
2661 | /* | |
2662 | * There are two different scenarios here: | |
2663 | * 1. The stripe has some data cached, and it is sent to | |
2664 | * write-out phase for reclaim | |
2665 | * 2. The stripe is clean, and this is the first write | |
2666 | * | |
2667 | * For 1, return -EAGAIN, so we continue with | |
2668 | * handle_stripe_dirtying(). | |
2669 | * | |
2670 | * For 2, set STRIPE_R5C_CACHING and continue with caching | |
2671 | * write. | |
2672 | */ | |
2673 | ||
2674 | /* case 1: anything injournal or anything in written */ | |
2675 | if (s->injournal > 0 || s->written > 0) | |
2676 | return -EAGAIN; | |
2677 | /* case 2 */ | |
2678 | set_bit(STRIPE_R5C_CACHING, &sh->state); | |
2679 | } | |
2680 | ||
2e38a37f SL |
2681 | /* |
2682 | * When run in degraded mode, array is set to write-through mode. | |
2683 | * This check helps drain pending write safely in the transition to | |
2684 | * write-through mode. | |
5ddf0440 SL |
2685 | * |
2686 | * When a stripe is syncing, the write is also handled in write | |
2687 | * through mode. | |
2e38a37f | 2688 | */ |
5ddf0440 | 2689 | if (s->failed || test_bit(STRIPE_SYNCING, &sh->state)) { |
2e38a37f SL |
2690 | r5c_make_stripe_write_out(sh); |
2691 | return -EAGAIN; | |
2692 | } | |
2693 | ||
1e6d690b SL |
2694 | for (i = disks; i--; ) { |
2695 | dev = &sh->dev[i]; | |
2696 | /* if non-overwrite, use writing-out phase */ | |
2697 | if (dev->towrite && !test_bit(R5_OVERWRITE, &dev->flags) && | |
2698 | !test_bit(R5_InJournal, &dev->flags)) { | |
2699 | r5c_make_stripe_write_out(sh); | |
2700 | return -EAGAIN; | |
2701 | } | |
2702 | } | |
2703 | ||
03b047f4 SL |
2704 | /* if the stripe is not counted in big_stripe_tree, add it now */ |
2705 | if (!test_bit(STRIPE_R5C_PARTIAL_STRIPE, &sh->state) && | |
2706 | !test_bit(STRIPE_R5C_FULL_STRIPE, &sh->state)) { | |
2707 | tree_index = r5c_tree_index(conf, sh->sector); | |
2708 | spin_lock(&log->tree_lock); | |
2709 | pslot = radix_tree_lookup_slot(&log->big_stripe_tree, | |
2710 | tree_index); | |
2711 | if (pslot) { | |
2712 | refcount = (uintptr_t)radix_tree_deref_slot_protected( | |
2713 | pslot, &log->tree_lock) >> | |
2714 | R5C_RADIX_COUNT_SHIFT; | |
2715 | radix_tree_replace_slot( | |
2716 | &log->big_stripe_tree, pslot, | |
2717 | (void *)((refcount + 1) << R5C_RADIX_COUNT_SHIFT)); | |
2718 | } else { | |
2719 | /* | |
2720 | * this radix_tree_insert can fail safely, so no | |
2721 | * need to call radix_tree_preload() | |
2722 | */ | |
2723 | ret = radix_tree_insert( | |
2724 | &log->big_stripe_tree, tree_index, | |
2725 | (void *)(1 << R5C_RADIX_COUNT_SHIFT)); | |
2726 | if (ret) { | |
2727 | spin_unlock(&log->tree_lock); | |
2728 | r5c_make_stripe_write_out(sh); | |
2729 | return -EAGAIN; | |
2730 | } | |
2731 | } | |
2732 | spin_unlock(&log->tree_lock); | |
2733 | ||
2734 | /* | |
2735 | * set STRIPE_R5C_PARTIAL_STRIPE, this shows the stripe is | |
2736 | * counted in the radix tree | |
2737 | */ | |
2738 | set_bit(STRIPE_R5C_PARTIAL_STRIPE, &sh->state); | |
2739 | atomic_inc(&conf->r5c_cached_partial_stripes); | |
2740 | } | |
2741 | ||
1e6d690b SL |
2742 | for (i = disks; i--; ) { |
2743 | dev = &sh->dev[i]; | |
2744 | if (dev->towrite) { | |
2745 | set_bit(R5_Wantwrite, &dev->flags); | |
2746 | set_bit(R5_Wantdrain, &dev->flags); | |
2747 | set_bit(R5_LOCKED, &dev->flags); | |
2748 | to_cache++; | |
2749 | } | |
2750 | } | |
2751 | ||
2752 | if (to_cache) { | |
2753 | set_bit(STRIPE_OP_BIODRAIN, &s->ops_request); | |
2754 | /* | |
2755 | * set STRIPE_LOG_TRAPPED, which triggers r5c_cache_data() | |
2756 | * in ops_run_io(). STRIPE_LOG_TRAPPED will be cleared in | |
2757 | * r5c_handle_data_cached() | |
2758 | */ | |
2759 | set_bit(STRIPE_LOG_TRAPPED, &sh->state); | |
2760 | } | |
2761 | ||
2762 | return 0; | |
2763 | } | |
2764 | ||
2765 | /* | |
2766 | * free extra pages (orig_page) we allocated for prexor | |
2767 | */ | |
2768 | void r5c_release_extra_page(struct stripe_head *sh) | |
2769 | { | |
d7bd398e | 2770 | struct r5conf *conf = sh->raid_conf; |
1e6d690b | 2771 | int i; |
d7bd398e SL |
2772 | bool using_disk_info_extra_page; |
2773 | ||
2774 | using_disk_info_extra_page = | |
2775 | sh->dev[0].orig_page == conf->disks[0].extra_page; | |
1e6d690b SL |
2776 | |
2777 | for (i = sh->disks; i--; ) | |
2778 | if (sh->dev[i].page != sh->dev[i].orig_page) { | |
2779 | struct page *p = sh->dev[i].orig_page; | |
2780 | ||
2781 | sh->dev[i].orig_page = sh->dev[i].page; | |
86aa1397 SL |
2782 | clear_bit(R5_OrigPageUPTDODATE, &sh->dev[i].flags); |
2783 | ||
d7bd398e SL |
2784 | if (!using_disk_info_extra_page) |
2785 | put_page(p); | |
1e6d690b | 2786 | } |
d7bd398e SL |
2787 | |
2788 | if (using_disk_info_extra_page) { | |
2789 | clear_bit(R5C_EXTRA_PAGE_IN_USE, &conf->cache_state); | |
2790 | md_wakeup_thread(conf->mddev->thread); | |
2791 | } | |
2792 | } | |
2793 | ||
2794 | void r5c_use_extra_page(struct stripe_head *sh) | |
2795 | { | |
2796 | struct r5conf *conf = sh->raid_conf; | |
2797 | int i; | |
2798 | struct r5dev *dev; | |
2799 | ||
2800 | for (i = sh->disks; i--; ) { | |
2801 | dev = &sh->dev[i]; | |
2802 | if (dev->orig_page != dev->page) | |
2803 | put_page(dev->orig_page); | |
2804 | dev->orig_page = conf->disks[i].extra_page; | |
2805 | } | |
2ded3703 SL |
2806 | } |
2807 | ||
2808 | /* | |
2809 | * clean up the stripe (clear R5_InJournal for dev[pd_idx] etc.) after the | |
2810 | * stripe is committed to RAID disks. | |
2811 | */ | |
2812 | void r5c_finish_stripe_write_out(struct r5conf *conf, | |
2813 | struct stripe_head *sh, | |
2814 | struct stripe_head_state *s) | |
2815 | { | |
03b047f4 | 2816 | struct r5l_log *log = conf->log; |
1e6d690b SL |
2817 | int i; |
2818 | int do_wakeup = 0; | |
03b047f4 SL |
2819 | sector_t tree_index; |
2820 | void **pslot; | |
2821 | uintptr_t refcount; | |
1e6d690b | 2822 | |
03b047f4 | 2823 | if (!log || !test_bit(R5_InJournal, &sh->dev[sh->pd_idx].flags)) |
2ded3703 SL |
2824 | return; |
2825 | ||
2826 | WARN_ON(test_bit(STRIPE_R5C_CACHING, &sh->state)); | |
2827 | clear_bit(R5_InJournal, &sh->dev[sh->pd_idx].flags); | |
2828 | ||
03b047f4 | 2829 | if (log->r5c_journal_mode == R5C_JOURNAL_MODE_WRITE_THROUGH) |
2ded3703 | 2830 | return; |
1e6d690b SL |
2831 | |
2832 | for (i = sh->disks; i--; ) { | |
2833 | clear_bit(R5_InJournal, &sh->dev[i].flags); | |
2834 | if (test_and_clear_bit(R5_Overlap, &sh->dev[i].flags)) | |
2835 | do_wakeup = 1; | |
2836 | } | |
2837 | ||
2838 | /* | |
2839 | * analyse_stripe() runs before r5c_finish_stripe_write_out(), | |
2840 | * We updated R5_InJournal, so we also update s->injournal. | |
2841 | */ | |
2842 | s->injournal = 0; | |
2843 | ||
2844 | if (test_and_clear_bit(STRIPE_FULL_WRITE, &sh->state)) | |
2845 | if (atomic_dec_and_test(&conf->pending_full_writes)) | |
2846 | md_wakeup_thread(conf->mddev->thread); | |
2847 | ||
2848 | if (do_wakeup) | |
2849 | wake_up(&conf->wait_for_overlap); | |
a39f7afd | 2850 | |
03b047f4 | 2851 | spin_lock_irq(&log->stripe_in_journal_lock); |
a39f7afd | 2852 | list_del_init(&sh->r5c); |
03b047f4 | 2853 | spin_unlock_irq(&log->stripe_in_journal_lock); |
a39f7afd | 2854 | sh->log_start = MaxSector; |
03b047f4 SL |
2855 | |
2856 | atomic_dec(&log->stripe_in_journal_count); | |
2857 | r5c_update_log_state(log); | |
2858 | ||
2859 | /* stop counting this stripe in big_stripe_tree */ | |
2860 | if (test_bit(STRIPE_R5C_PARTIAL_STRIPE, &sh->state) || | |
2861 | test_bit(STRIPE_R5C_FULL_STRIPE, &sh->state)) { | |
2862 | tree_index = r5c_tree_index(conf, sh->sector); | |
2863 | spin_lock(&log->tree_lock); | |
2864 | pslot = radix_tree_lookup_slot(&log->big_stripe_tree, | |
2865 | tree_index); | |
2866 | BUG_ON(pslot == NULL); | |
2867 | refcount = (uintptr_t)radix_tree_deref_slot_protected( | |
2868 | pslot, &log->tree_lock) >> | |
2869 | R5C_RADIX_COUNT_SHIFT; | |
2870 | if (refcount == 1) | |
2871 | radix_tree_delete(&log->big_stripe_tree, tree_index); | |
2872 | else | |
2873 | radix_tree_replace_slot( | |
2874 | &log->big_stripe_tree, pslot, | |
2875 | (void *)((refcount - 1) << R5C_RADIX_COUNT_SHIFT)); | |
2876 | spin_unlock(&log->tree_lock); | |
2877 | } | |
2878 | ||
2879 | if (test_and_clear_bit(STRIPE_R5C_PARTIAL_STRIPE, &sh->state)) { | |
2880 | BUG_ON(atomic_read(&conf->r5c_cached_partial_stripes) == 0); | |
e33fbb9c | 2881 | atomic_dec(&conf->r5c_flushing_partial_stripes); |
03b047f4 SL |
2882 | atomic_dec(&conf->r5c_cached_partial_stripes); |
2883 | } | |
2884 | ||
2885 | if (test_and_clear_bit(STRIPE_R5C_FULL_STRIPE, &sh->state)) { | |
2886 | BUG_ON(atomic_read(&conf->r5c_cached_full_stripes) == 0); | |
e33fbb9c | 2887 | atomic_dec(&conf->r5c_flushing_full_stripes); |
03b047f4 SL |
2888 | atomic_dec(&conf->r5c_cached_full_stripes); |
2889 | } | |
ea17481f SL |
2890 | |
2891 | r5l_append_flush_payload(log, sh->sector); | |
5ddf0440 SL |
2892 | /* stripe is flused to raid disks, we can do resync now */ |
2893 | if (test_bit(STRIPE_SYNC_REQUESTED, &sh->state)) | |
2894 | set_bit(STRIPE_HANDLE, &sh->state); | |
1e6d690b SL |
2895 | } |
2896 | ||
ff875738 | 2897 | int r5c_cache_data(struct r5l_log *log, struct stripe_head *sh) |
1e6d690b | 2898 | { |
a39f7afd | 2899 | struct r5conf *conf = sh->raid_conf; |
1e6d690b SL |
2900 | int pages = 0; |
2901 | int reserve; | |
2902 | int i; | |
2903 | int ret = 0; | |
2904 | ||
2905 | BUG_ON(!log); | |
2906 | ||
2907 | for (i = 0; i < sh->disks; i++) { | |
2908 | void *addr; | |
2909 | ||
2910 | if (!test_bit(R5_Wantwrite, &sh->dev[i].flags)) | |
2911 | continue; | |
2912 | addr = kmap_atomic(sh->dev[i].page); | |
2913 | sh->dev[i].log_checksum = crc32c_le(log->uuid_checksum, | |
2914 | addr, PAGE_SIZE); | |
2915 | kunmap_atomic(addr); | |
2916 | pages++; | |
2917 | } | |
2918 | WARN_ON(pages == 0); | |
2919 | ||
2920 | /* | |
2921 | * The stripe must enter state machine again to call endio, so | |
2922 | * don't delay. | |
2923 | */ | |
2924 | clear_bit(STRIPE_DELAYED, &sh->state); | |
2925 | atomic_inc(&sh->count); | |
2926 | ||
2927 | mutex_lock(&log->io_mutex); | |
2928 | /* meta + data */ | |
2929 | reserve = (1 + pages) << (PAGE_SHIFT - 9); | |
1e6d690b | 2930 | |
a39f7afd SL |
2931 | if (test_bit(R5C_LOG_CRITICAL, &conf->cache_state) && |
2932 | sh->log_start == MaxSector) | |
2933 | r5l_add_no_space_stripe(log, sh); | |
2934 | else if (!r5l_has_free_space(log, reserve)) { | |
2935 | if (sh->log_start == log->last_checkpoint) | |
2936 | BUG(); | |
2937 | else | |
2938 | r5l_add_no_space_stripe(log, sh); | |
1e6d690b SL |
2939 | } else { |
2940 | ret = r5l_log_stripe(log, sh, pages, 0); | |
2941 | if (ret) { | |
2942 | spin_lock_irq(&log->io_list_lock); | |
2943 | list_add_tail(&sh->log_list, &log->no_mem_stripes); | |
2944 | spin_unlock_irq(&log->io_list_lock); | |
2945 | } | |
2946 | } | |
2947 | ||
2948 | mutex_unlock(&log->io_mutex); | |
2949 | return 0; | |
f6bed0ef SL |
2950 | } |
2951 | ||
03b047f4 SL |
2952 | /* check whether this big stripe is in write back cache. */ |
2953 | bool r5c_big_stripe_cached(struct r5conf *conf, sector_t sect) | |
2954 | { | |
2955 | struct r5l_log *log = conf->log; | |
2956 | sector_t tree_index; | |
2957 | void *slot; | |
2958 | ||
2959 | if (!log) | |
2960 | return false; | |
2961 | ||
2962 | WARN_ON_ONCE(!rcu_read_lock_held()); | |
2963 | tree_index = r5c_tree_index(conf, sect); | |
2964 | slot = radix_tree_lookup(&log->big_stripe_tree, tree_index); | |
2965 | return slot != NULL; | |
2966 | } | |
2967 | ||
f6bed0ef SL |
2968 | static int r5l_load_log(struct r5l_log *log) |
2969 | { | |
2970 | struct md_rdev *rdev = log->rdev; | |
2971 | struct page *page; | |
2972 | struct r5l_meta_block *mb; | |
2973 | sector_t cp = log->rdev->journal_tail; | |
2974 | u32 stored_crc, expected_crc; | |
2975 | bool create_super = false; | |
d30dfeb9 | 2976 | int ret = 0; |
f6bed0ef SL |
2977 | |
2978 | /* Make sure it's valid */ | |
2979 | if (cp >= rdev->sectors || round_down(cp, BLOCK_SECTORS) != cp) | |
2980 | cp = 0; | |
2981 | page = alloc_page(GFP_KERNEL); | |
2982 | if (!page) | |
2983 | return -ENOMEM; | |
2984 | ||
796a5cf0 | 2985 | if (!sync_page_io(rdev, cp, PAGE_SIZE, page, REQ_OP_READ, 0, false)) { |
f6bed0ef SL |
2986 | ret = -EIO; |
2987 | goto ioerr; | |
2988 | } | |
2989 | mb = page_address(page); | |
2990 | ||
2991 | if (le32_to_cpu(mb->magic) != R5LOG_MAGIC || | |
2992 | mb->version != R5LOG_VERSION) { | |
2993 | create_super = true; | |
2994 | goto create; | |
2995 | } | |
2996 | stored_crc = le32_to_cpu(mb->checksum); | |
2997 | mb->checksum = 0; | |
5cb2fbd6 | 2998 | expected_crc = crc32c_le(log->uuid_checksum, mb, PAGE_SIZE); |
f6bed0ef SL |
2999 | if (stored_crc != expected_crc) { |
3000 | create_super = true; | |
3001 | goto create; | |
3002 | } | |
3003 | if (le64_to_cpu(mb->position) != cp) { | |
3004 | create_super = true; | |
3005 | goto create; | |
3006 | } | |
3007 | create: | |
3008 | if (create_super) { | |
3009 | log->last_cp_seq = prandom_u32(); | |
3010 | cp = 0; | |
56056c2e | 3011 | r5l_log_write_empty_meta_block(log, cp, log->last_cp_seq); |
f6bed0ef SL |
3012 | /* |
3013 | * Make sure super points to correct address. Log might have | |
3014 | * data very soon. If super hasn't correct log tail address, | |
3015 | * recovery can't find the log | |
3016 | */ | |
3017 | r5l_write_super(log, cp); | |
3018 | } else | |
3019 | log->last_cp_seq = le64_to_cpu(mb->seq); | |
3020 | ||
3021 | log->device_size = round_down(rdev->sectors, BLOCK_SECTORS); | |
0576b1c6 SL |
3022 | log->max_free_space = log->device_size >> RECLAIM_MAX_FREE_SPACE_SHIFT; |
3023 | if (log->max_free_space > RECLAIM_MAX_FREE_SPACE) | |
3024 | log->max_free_space = RECLAIM_MAX_FREE_SPACE; | |
f6bed0ef SL |
3025 | log->last_checkpoint = cp; |
3026 | ||
3027 | __free_page(page); | |
3028 | ||
d30dfeb9 J |
3029 | if (create_super) { |
3030 | log->log_start = r5l_ring_add(log, cp, BLOCK_SECTORS); | |
3031 | log->seq = log->last_cp_seq + 1; | |
3032 | log->next_checkpoint = cp; | |
3033 | } else | |
3034 | ret = r5l_recovery_log(log); | |
3035 | ||
3d7e7e1d ZL |
3036 | r5c_update_log_state(log); |
3037 | return ret; | |
f6bed0ef SL |
3038 | ioerr: |
3039 | __free_page(page); | |
3040 | return ret; | |
3041 | } | |
3042 | ||
70d466f7 | 3043 | void r5c_update_on_rdev_error(struct mddev *mddev, struct md_rdev *rdev) |
2e38a37f SL |
3044 | { |
3045 | struct r5conf *conf = mddev->private; | |
3046 | struct r5l_log *log = conf->log; | |
3047 | ||
3048 | if (!log) | |
3049 | return; | |
3050 | ||
70d466f7 SL |
3051 | if ((raid5_calc_degraded(conf) > 0 || |
3052 | test_bit(Journal, &rdev->flags)) && | |
2e38a37f SL |
3053 | conf->log->r5c_journal_mode == R5C_JOURNAL_MODE_WRITE_BACK) |
3054 | schedule_work(&log->disable_writeback_work); | |
3055 | } | |
3056 | ||
f6bed0ef SL |
3057 | int r5l_init_log(struct r5conf *conf, struct md_rdev *rdev) |
3058 | { | |
c888a8f9 | 3059 | struct request_queue *q = bdev_get_queue(rdev->bdev); |
f6bed0ef | 3060 | struct r5l_log *log; |
ff875738 AP |
3061 | char b[BDEVNAME_SIZE]; |
3062 | ||
3063 | pr_debug("md/raid:%s: using device %s as journal\n", | |
3064 | mdname(conf->mddev), bdevname(rdev->bdev, b)); | |
f6bed0ef SL |
3065 | |
3066 | if (PAGE_SIZE != 4096) | |
3067 | return -EINVAL; | |
c757ec95 SL |
3068 | |
3069 | /* | |
3070 | * The PAGE_SIZE must be big enough to hold 1 r5l_meta_block and | |
3071 | * raid_disks r5l_payload_data_parity. | |
3072 | * | |
3073 | * Write journal and cache does not work for very big array | |
3074 | * (raid_disks > 203) | |
3075 | */ | |
3076 | if (sizeof(struct r5l_meta_block) + | |
3077 | ((sizeof(struct r5l_payload_data_parity) + sizeof(__le32)) * | |
3078 | conf->raid_disks) > PAGE_SIZE) { | |
3079 | pr_err("md/raid:%s: write journal/cache doesn't work for array with %d disks\n", | |
3080 | mdname(conf->mddev), conf->raid_disks); | |
3081 | return -EINVAL; | |
3082 | } | |
3083 | ||
f6bed0ef SL |
3084 | log = kzalloc(sizeof(*log), GFP_KERNEL); |
3085 | if (!log) | |
3086 | return -ENOMEM; | |
3087 | log->rdev = rdev; | |
3088 | ||
c888a8f9 | 3089 | log->need_cache_flush = test_bit(QUEUE_FLAG_WC, &q->queue_flags) != 0; |
56fef7c6 | 3090 | |
5cb2fbd6 SL |
3091 | log->uuid_checksum = crc32c_le(~0, rdev->mddev->uuid, |
3092 | sizeof(rdev->mddev->uuid)); | |
f6bed0ef SL |
3093 | |
3094 | mutex_init(&log->io_mutex); | |
3095 | ||
3096 | spin_lock_init(&log->io_list_lock); | |
3097 | INIT_LIST_HEAD(&log->running_ios); | |
0576b1c6 | 3098 | INIT_LIST_HEAD(&log->io_end_ios); |
a8c34f91 | 3099 | INIT_LIST_HEAD(&log->flushing_ios); |
04732f74 | 3100 | INIT_LIST_HEAD(&log->finished_ios); |
3a83f467 | 3101 | bio_init(&log->flush_bio, NULL, 0); |
f6bed0ef SL |
3102 | |
3103 | log->io_kc = KMEM_CACHE(r5l_io_unit, 0); | |
3104 | if (!log->io_kc) | |
3105 | goto io_kc; | |
3106 | ||
5036c390 CH |
3107 | log->io_pool = mempool_create_slab_pool(R5L_POOL_SIZE, log->io_kc); |
3108 | if (!log->io_pool) | |
3109 | goto io_pool; | |
3110 | ||
011067b0 | 3111 | log->bs = bioset_create(R5L_POOL_SIZE, 0, BIOSET_NEED_BVECS); |
c38d29b3 CH |
3112 | if (!log->bs) |
3113 | goto io_bs; | |
3114 | ||
e8deb638 CH |
3115 | log->meta_pool = mempool_create_page_pool(R5L_POOL_SIZE, 0); |
3116 | if (!log->meta_pool) | |
3117 | goto out_mempool; | |
3118 | ||
03b047f4 SL |
3119 | spin_lock_init(&log->tree_lock); |
3120 | INIT_RADIX_TREE(&log->big_stripe_tree, GFP_NOWAIT | __GFP_NOWARN); | |
3121 | ||
0576b1c6 SL |
3122 | log->reclaim_thread = md_register_thread(r5l_reclaim_thread, |
3123 | log->rdev->mddev, "reclaim"); | |
3124 | if (!log->reclaim_thread) | |
3125 | goto reclaim_thread; | |
a39f7afd SL |
3126 | log->reclaim_thread->timeout = R5C_RECLAIM_WAKEUP_INTERVAL; |
3127 | ||
0fd22b45 | 3128 | init_waitqueue_head(&log->iounit_wait); |
0576b1c6 | 3129 | |
5036c390 CH |
3130 | INIT_LIST_HEAD(&log->no_mem_stripes); |
3131 | ||
f6bed0ef SL |
3132 | INIT_LIST_HEAD(&log->no_space_stripes); |
3133 | spin_lock_init(&log->no_space_stripes_lock); | |
3134 | ||
3bddb7f8 | 3135 | INIT_WORK(&log->deferred_io_work, r5l_submit_io_async); |
2e38a37f | 3136 | INIT_WORK(&log->disable_writeback_work, r5c_disable_writeback_async); |
3bddb7f8 | 3137 | |
2ded3703 | 3138 | log->r5c_journal_mode = R5C_JOURNAL_MODE_WRITE_THROUGH; |
a39f7afd SL |
3139 | INIT_LIST_HEAD(&log->stripe_in_journal_list); |
3140 | spin_lock_init(&log->stripe_in_journal_lock); | |
3141 | atomic_set(&log->stripe_in_journal_count, 0); | |
2ded3703 | 3142 | |
d2250f10 SL |
3143 | rcu_assign_pointer(conf->log, log); |
3144 | ||
f6bed0ef SL |
3145 | if (r5l_load_log(log)) |
3146 | goto error; | |
3147 | ||
a62ab49e | 3148 | set_bit(MD_HAS_JOURNAL, &conf->mddev->flags); |
f6bed0ef | 3149 | return 0; |
e8deb638 | 3150 | |
f6bed0ef | 3151 | error: |
d2250f10 | 3152 | rcu_assign_pointer(conf->log, NULL); |
0576b1c6 SL |
3153 | md_unregister_thread(&log->reclaim_thread); |
3154 | reclaim_thread: | |
e8deb638 CH |
3155 | mempool_destroy(log->meta_pool); |
3156 | out_mempool: | |
c38d29b3 CH |
3157 | bioset_free(log->bs); |
3158 | io_bs: | |
5036c390 CH |
3159 | mempool_destroy(log->io_pool); |
3160 | io_pool: | |
f6bed0ef SL |
3161 | kmem_cache_destroy(log->io_kc); |
3162 | io_kc: | |
3163 | kfree(log); | |
3164 | return -EINVAL; | |
3165 | } | |
3166 | ||
ff875738 | 3167 | void r5l_exit_log(struct r5conf *conf) |
f6bed0ef | 3168 | { |
ff875738 AP |
3169 | struct r5l_log *log = conf->log; |
3170 | ||
3171 | conf->log = NULL; | |
3172 | synchronize_rcu(); | |
3173 | ||
4d5324f7 N |
3174 | /* Ensure disable_writeback_work wakes up and exits */ |
3175 | wake_up(&conf->mddev->sb_wait); | |
2e38a37f | 3176 | flush_work(&log->disable_writeback_work); |
0576b1c6 | 3177 | md_unregister_thread(&log->reclaim_thread); |
e8deb638 | 3178 | mempool_destroy(log->meta_pool); |
c38d29b3 | 3179 | bioset_free(log->bs); |
5036c390 | 3180 | mempool_destroy(log->io_pool); |
f6bed0ef SL |
3181 | kmem_cache_destroy(log->io_kc); |
3182 | kfree(log); | |
3183 | } |