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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; |
afeee514 KO |
128 | mempool_t io_pool; |
129 | struct bio_set bs; | |
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]); |
e64e4018 AS |
327 | md_bitmap_endwrite(conf->mddev->bitmap, sh->sector, |
328 | STRIPE_SECTORS, | |
329 | !test_bit(STRIPE_DEGRADED, &sh->state), | |
330 | 0); | |
1e6d690b SL |
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 | ||
efa4b77b | 542 | lockdep_assert_held(&log->io_list_lock); |
56fef7c6 CH |
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 | ||
efa4b77b | 558 | lockdep_assert_held(&log->io_list_lock); |
3848c0bc CH |
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); |
afeee514 | 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; | |
720 | struct r5l_meta_block *block; | |
509ffec7 | 721 | unsigned long flags; |
f6bed0ef | 722 | u32 crc; |
3bddb7f8 | 723 | bool do_submit = true; |
f6bed0ef SL |
724 | |
725 | if (!io) | |
726 | return; | |
727 | ||
728 | block = page_address(io->meta_page); | |
729 | block->meta_size = cpu_to_le32(io->meta_offset); | |
5cb2fbd6 | 730 | crc = crc32c_le(log->uuid_checksum, block, PAGE_SIZE); |
f6bed0ef SL |
731 | block->checksum = cpu_to_le32(crc); |
732 | ||
733 | log->current_io = NULL; | |
509ffec7 | 734 | spin_lock_irqsave(&log->io_list_lock, flags); |
3bddb7f8 SL |
735 | if (io->has_flush || io->has_fua) { |
736 | if (io != list_first_entry(&log->running_ios, | |
737 | struct r5l_io_unit, log_sibling)) { | |
738 | io->io_deferred = 1; | |
739 | do_submit = false; | |
740 | } | |
741 | } | |
509ffec7 | 742 | spin_unlock_irqrestore(&log->io_list_lock, flags); |
3bddb7f8 SL |
743 | if (do_submit) |
744 | r5l_do_submit_io(log, io); | |
f6bed0ef SL |
745 | } |
746 | ||
6143e2ce | 747 | static struct bio *r5l_bio_alloc(struct r5l_log *log) |
b349feb3 | 748 | { |
afeee514 | 749 | struct bio *bio = bio_alloc_bioset(GFP_NOIO, BIO_MAX_PAGES, &log->bs); |
b349feb3 | 750 | |
796a5cf0 | 751 | bio_set_op_attrs(bio, REQ_OP_WRITE, 0); |
74d46992 | 752 | bio_set_dev(bio, log->rdev->bdev); |
1e932a37 | 753 | bio->bi_iter.bi_sector = log->rdev->data_offset + log->log_start; |
b349feb3 | 754 | |
b349feb3 CH |
755 | return bio; |
756 | } | |
757 | ||
c1b99198 CH |
758 | static void r5_reserve_log_entry(struct r5l_log *log, struct r5l_io_unit *io) |
759 | { | |
760 | log->log_start = r5l_ring_add(log, log->log_start, BLOCK_SECTORS); | |
761 | ||
a39f7afd | 762 | r5c_update_log_state(log); |
c1b99198 CH |
763 | /* |
764 | * If we filled up the log device start from the beginning again, | |
765 | * which will require a new bio. | |
766 | * | |
767 | * Note: for this to work properly the log size needs to me a multiple | |
768 | * of BLOCK_SECTORS. | |
769 | */ | |
770 | if (log->log_start == 0) | |
6143e2ce | 771 | io->need_split_bio = true; |
c1b99198 CH |
772 | |
773 | io->log_end = log->log_start; | |
774 | } | |
775 | ||
f6bed0ef SL |
776 | static struct r5l_io_unit *r5l_new_meta(struct r5l_log *log) |
777 | { | |
778 | struct r5l_io_unit *io; | |
779 | struct r5l_meta_block *block; | |
f6bed0ef | 780 | |
afeee514 | 781 | io = mempool_alloc(&log->io_pool, GFP_ATOMIC); |
5036c390 CH |
782 | if (!io) |
783 | return NULL; | |
784 | memset(io, 0, sizeof(*io)); | |
785 | ||
51039cd0 | 786 | io->log = log; |
51039cd0 CH |
787 | INIT_LIST_HEAD(&io->log_sibling); |
788 | INIT_LIST_HEAD(&io->stripe_list); | |
3bddb7f8 | 789 | bio_list_init(&io->flush_barriers); |
51039cd0 | 790 | io->state = IO_UNIT_RUNNING; |
f6bed0ef | 791 | |
afeee514 | 792 | io->meta_page = mempool_alloc(&log->meta_pool, GFP_NOIO); |
f6bed0ef | 793 | block = page_address(io->meta_page); |
e8deb638 | 794 | clear_page(block); |
f6bed0ef SL |
795 | block->magic = cpu_to_le32(R5LOG_MAGIC); |
796 | block->version = R5LOG_VERSION; | |
797 | block->seq = cpu_to_le64(log->seq); | |
798 | block->position = cpu_to_le64(log->log_start); | |
799 | ||
800 | io->log_start = log->log_start; | |
801 | io->meta_offset = sizeof(struct r5l_meta_block); | |
2b8ef16e | 802 | io->seq = log->seq++; |
f6bed0ef | 803 | |
6143e2ce CH |
804 | io->current_bio = r5l_bio_alloc(log); |
805 | io->current_bio->bi_end_io = r5l_log_endio; | |
806 | io->current_bio->bi_private = io; | |
b349feb3 | 807 | bio_add_page(io->current_bio, io->meta_page, PAGE_SIZE, 0); |
f6bed0ef | 808 | |
c1b99198 | 809 | r5_reserve_log_entry(log, io); |
f6bed0ef SL |
810 | |
811 | spin_lock_irq(&log->io_list_lock); | |
812 | list_add_tail(&io->log_sibling, &log->running_ios); | |
813 | spin_unlock_irq(&log->io_list_lock); | |
814 | ||
815 | return io; | |
816 | } | |
817 | ||
818 | static int r5l_get_meta(struct r5l_log *log, unsigned int payload_size) | |
819 | { | |
22581f58 CH |
820 | if (log->current_io && |
821 | log->current_io->meta_offset + payload_size > PAGE_SIZE) | |
f6bed0ef | 822 | r5l_submit_current_io(log); |
f6bed0ef | 823 | |
5036c390 | 824 | if (!log->current_io) { |
22581f58 | 825 | log->current_io = r5l_new_meta(log); |
5036c390 CH |
826 | if (!log->current_io) |
827 | return -ENOMEM; | |
828 | } | |
829 | ||
f6bed0ef SL |
830 | return 0; |
831 | } | |
832 | ||
833 | static void r5l_append_payload_meta(struct r5l_log *log, u16 type, | |
834 | sector_t location, | |
835 | u32 checksum1, u32 checksum2, | |
836 | bool checksum2_valid) | |
837 | { | |
838 | struct r5l_io_unit *io = log->current_io; | |
839 | struct r5l_payload_data_parity *payload; | |
840 | ||
841 | payload = page_address(io->meta_page) + io->meta_offset; | |
842 | payload->header.type = cpu_to_le16(type); | |
843 | payload->header.flags = cpu_to_le16(0); | |
844 | payload->size = cpu_to_le32((1 + !!checksum2_valid) << | |
845 | (PAGE_SHIFT - 9)); | |
846 | payload->location = cpu_to_le64(location); | |
847 | payload->checksum[0] = cpu_to_le32(checksum1); | |
848 | if (checksum2_valid) | |
849 | payload->checksum[1] = cpu_to_le32(checksum2); | |
850 | ||
851 | io->meta_offset += sizeof(struct r5l_payload_data_parity) + | |
852 | sizeof(__le32) * (1 + !!checksum2_valid); | |
853 | } | |
854 | ||
855 | static void r5l_append_payload_page(struct r5l_log *log, struct page *page) | |
856 | { | |
857 | struct r5l_io_unit *io = log->current_io; | |
858 | ||
6143e2ce | 859 | if (io->need_split_bio) { |
3bddb7f8 SL |
860 | BUG_ON(io->split_bio); |
861 | io->split_bio = io->current_bio; | |
6143e2ce | 862 | io->current_bio = r5l_bio_alloc(log); |
3bddb7f8 SL |
863 | bio_chain(io->current_bio, io->split_bio); |
864 | io->need_split_bio = false; | |
f6bed0ef | 865 | } |
f6bed0ef | 866 | |
6143e2ce CH |
867 | if (!bio_add_page(io->current_bio, page, PAGE_SIZE, 0)) |
868 | BUG(); | |
869 | ||
c1b99198 | 870 | r5_reserve_log_entry(log, io); |
f6bed0ef SL |
871 | } |
872 | ||
ea17481f SL |
873 | static void r5l_append_flush_payload(struct r5l_log *log, sector_t sect) |
874 | { | |
875 | struct mddev *mddev = log->rdev->mddev; | |
876 | struct r5conf *conf = mddev->private; | |
877 | struct r5l_io_unit *io; | |
878 | struct r5l_payload_flush *payload; | |
879 | int meta_size; | |
880 | ||
881 | /* | |
882 | * payload_flush requires extra writes to the journal. | |
883 | * To avoid handling the extra IO in quiesce, just skip | |
884 | * flush_payload | |
885 | */ | |
886 | if (conf->quiesce) | |
887 | return; | |
888 | ||
889 | mutex_lock(&log->io_mutex); | |
890 | meta_size = sizeof(struct r5l_payload_flush) + sizeof(__le64); | |
891 | ||
892 | if (r5l_get_meta(log, meta_size)) { | |
893 | mutex_unlock(&log->io_mutex); | |
894 | return; | |
895 | } | |
896 | ||
897 | /* current implementation is one stripe per flush payload */ | |
898 | io = log->current_io; | |
899 | payload = page_address(io->meta_page) + io->meta_offset; | |
900 | payload->header.type = cpu_to_le16(R5LOG_PAYLOAD_FLUSH); | |
901 | payload->header.flags = cpu_to_le16(0); | |
902 | payload->size = cpu_to_le32(sizeof(__le64)); | |
903 | payload->flush_stripes[0] = cpu_to_le64(sect); | |
904 | io->meta_offset += meta_size; | |
a9501d74 SL |
905 | /* multiple flush payloads count as one pending_stripe */ |
906 | if (!io->has_flush_payload) { | |
907 | io->has_flush_payload = 1; | |
908 | atomic_inc(&io->pending_stripe); | |
909 | } | |
ea17481f SL |
910 | mutex_unlock(&log->io_mutex); |
911 | } | |
912 | ||
5036c390 | 913 | static int r5l_log_stripe(struct r5l_log *log, struct stripe_head *sh, |
f6bed0ef SL |
914 | int data_pages, int parity_pages) |
915 | { | |
916 | int i; | |
917 | int meta_size; | |
5036c390 | 918 | int ret; |
f6bed0ef SL |
919 | struct r5l_io_unit *io; |
920 | ||
921 | meta_size = | |
922 | ((sizeof(struct r5l_payload_data_parity) + sizeof(__le32)) | |
923 | * data_pages) + | |
924 | sizeof(struct r5l_payload_data_parity) + | |
925 | sizeof(__le32) * parity_pages; | |
926 | ||
5036c390 CH |
927 | ret = r5l_get_meta(log, meta_size); |
928 | if (ret) | |
929 | return ret; | |
930 | ||
f6bed0ef SL |
931 | io = log->current_io; |
932 | ||
3bddb7f8 SL |
933 | if (test_and_clear_bit(STRIPE_R5C_PREFLUSH, &sh->state)) |
934 | io->has_flush = 1; | |
935 | ||
f6bed0ef | 936 | for (i = 0; i < sh->disks; i++) { |
1e6d690b SL |
937 | if (!test_bit(R5_Wantwrite, &sh->dev[i].flags) || |
938 | test_bit(R5_InJournal, &sh->dev[i].flags)) | |
f6bed0ef SL |
939 | continue; |
940 | if (i == sh->pd_idx || i == sh->qd_idx) | |
941 | continue; | |
3bddb7f8 SL |
942 | if (test_bit(R5_WantFUA, &sh->dev[i].flags) && |
943 | log->r5c_journal_mode == R5C_JOURNAL_MODE_WRITE_BACK) { | |
944 | io->has_fua = 1; | |
945 | /* | |
946 | * we need to flush journal to make sure recovery can | |
947 | * reach the data with fua flag | |
948 | */ | |
949 | io->has_flush = 1; | |
950 | } | |
f6bed0ef SL |
951 | r5l_append_payload_meta(log, R5LOG_PAYLOAD_DATA, |
952 | raid5_compute_blocknr(sh, i, 0), | |
953 | sh->dev[i].log_checksum, 0, false); | |
954 | r5l_append_payload_page(log, sh->dev[i].page); | |
955 | } | |
956 | ||
2ded3703 | 957 | if (parity_pages == 2) { |
f6bed0ef SL |
958 | r5l_append_payload_meta(log, R5LOG_PAYLOAD_PARITY, |
959 | sh->sector, sh->dev[sh->pd_idx].log_checksum, | |
960 | sh->dev[sh->qd_idx].log_checksum, true); | |
961 | r5l_append_payload_page(log, sh->dev[sh->pd_idx].page); | |
962 | r5l_append_payload_page(log, sh->dev[sh->qd_idx].page); | |
2ded3703 | 963 | } else if (parity_pages == 1) { |
f6bed0ef SL |
964 | r5l_append_payload_meta(log, R5LOG_PAYLOAD_PARITY, |
965 | sh->sector, sh->dev[sh->pd_idx].log_checksum, | |
966 | 0, false); | |
967 | r5l_append_payload_page(log, sh->dev[sh->pd_idx].page); | |
2ded3703 SL |
968 | } else /* Just writing data, not parity, in caching phase */ |
969 | BUG_ON(parity_pages != 0); | |
f6bed0ef SL |
970 | |
971 | list_add_tail(&sh->log_list, &io->stripe_list); | |
972 | atomic_inc(&io->pending_stripe); | |
973 | sh->log_io = io; | |
5036c390 | 974 | |
a39f7afd SL |
975 | if (log->r5c_journal_mode == R5C_JOURNAL_MODE_WRITE_THROUGH) |
976 | return 0; | |
977 | ||
978 | if (sh->log_start == MaxSector) { | |
979 | BUG_ON(!list_empty(&sh->r5c)); | |
980 | sh->log_start = io->log_start; | |
981 | spin_lock_irq(&log->stripe_in_journal_lock); | |
982 | list_add_tail(&sh->r5c, | |
983 | &log->stripe_in_journal_list); | |
984 | spin_unlock_irq(&log->stripe_in_journal_lock); | |
985 | atomic_inc(&log->stripe_in_journal_count); | |
986 | } | |
5036c390 | 987 | return 0; |
f6bed0ef SL |
988 | } |
989 | ||
a39f7afd SL |
990 | /* add stripe to no_space_stripes, and then wake up reclaim */ |
991 | static inline void r5l_add_no_space_stripe(struct r5l_log *log, | |
992 | struct stripe_head *sh) | |
993 | { | |
994 | spin_lock(&log->no_space_stripes_lock); | |
995 | list_add_tail(&sh->log_list, &log->no_space_stripes); | |
996 | spin_unlock(&log->no_space_stripes_lock); | |
997 | } | |
998 | ||
f6bed0ef SL |
999 | /* |
1000 | * running in raid5d, where reclaim could wait for raid5d too (when it flushes | |
1001 | * data from log to raid disks), so we shouldn't wait for reclaim here | |
1002 | */ | |
1003 | int r5l_write_stripe(struct r5l_log *log, struct stripe_head *sh) | |
1004 | { | |
a39f7afd | 1005 | struct r5conf *conf = sh->raid_conf; |
f6bed0ef SL |
1006 | int write_disks = 0; |
1007 | int data_pages, parity_pages; | |
f6bed0ef SL |
1008 | int reserve; |
1009 | int i; | |
5036c390 | 1010 | int ret = 0; |
a39f7afd | 1011 | bool wake_reclaim = false; |
f6bed0ef SL |
1012 | |
1013 | if (!log) | |
1014 | return -EAGAIN; | |
1015 | /* Don't support stripe batch */ | |
1016 | if (sh->log_io || !test_bit(R5_Wantwrite, &sh->dev[sh->pd_idx].flags) || | |
1017 | test_bit(STRIPE_SYNCING, &sh->state)) { | |
1018 | /* the stripe is written to log, we start writing it to raid */ | |
1019 | clear_bit(STRIPE_LOG_TRAPPED, &sh->state); | |
1020 | return -EAGAIN; | |
1021 | } | |
1022 | ||
2ded3703 SL |
1023 | WARN_ON(test_bit(STRIPE_R5C_CACHING, &sh->state)); |
1024 | ||
f6bed0ef SL |
1025 | for (i = 0; i < sh->disks; i++) { |
1026 | void *addr; | |
1027 | ||
1e6d690b SL |
1028 | if (!test_bit(R5_Wantwrite, &sh->dev[i].flags) || |
1029 | test_bit(R5_InJournal, &sh->dev[i].flags)) | |
f6bed0ef | 1030 | continue; |
1e6d690b | 1031 | |
f6bed0ef SL |
1032 | write_disks++; |
1033 | /* checksum is already calculated in last run */ | |
1034 | if (test_bit(STRIPE_LOG_TRAPPED, &sh->state)) | |
1035 | continue; | |
1036 | addr = kmap_atomic(sh->dev[i].page); | |
5cb2fbd6 SL |
1037 | sh->dev[i].log_checksum = crc32c_le(log->uuid_checksum, |
1038 | addr, PAGE_SIZE); | |
f6bed0ef SL |
1039 | kunmap_atomic(addr); |
1040 | } | |
1041 | parity_pages = 1 + !!(sh->qd_idx >= 0); | |
1042 | data_pages = write_disks - parity_pages; | |
1043 | ||
f6bed0ef | 1044 | set_bit(STRIPE_LOG_TRAPPED, &sh->state); |
253f9fd4 SL |
1045 | /* |
1046 | * The stripe must enter state machine again to finish the write, so | |
1047 | * don't delay. | |
1048 | */ | |
1049 | clear_bit(STRIPE_DELAYED, &sh->state); | |
f6bed0ef SL |
1050 | atomic_inc(&sh->count); |
1051 | ||
1052 | mutex_lock(&log->io_mutex); | |
1053 | /* meta + data */ | |
1054 | reserve = (1 + write_disks) << (PAGE_SHIFT - 9); | |
f6bed0ef | 1055 | |
a39f7afd SL |
1056 | if (log->r5c_journal_mode == R5C_JOURNAL_MODE_WRITE_THROUGH) { |
1057 | if (!r5l_has_free_space(log, reserve)) { | |
1058 | r5l_add_no_space_stripe(log, sh); | |
1059 | wake_reclaim = true; | |
1060 | } else { | |
1061 | ret = r5l_log_stripe(log, sh, data_pages, parity_pages); | |
1062 | if (ret) { | |
1063 | spin_lock_irq(&log->io_list_lock); | |
1064 | list_add_tail(&sh->log_list, | |
1065 | &log->no_mem_stripes); | |
1066 | spin_unlock_irq(&log->io_list_lock); | |
1067 | } | |
1068 | } | |
1069 | } else { /* R5C_JOURNAL_MODE_WRITE_BACK */ | |
1070 | /* | |
1071 | * log space critical, do not process stripes that are | |
1072 | * not in cache yet (sh->log_start == MaxSector). | |
1073 | */ | |
1074 | if (test_bit(R5C_LOG_CRITICAL, &conf->cache_state) && | |
1075 | sh->log_start == MaxSector) { | |
1076 | r5l_add_no_space_stripe(log, sh); | |
1077 | wake_reclaim = true; | |
1078 | reserve = 0; | |
1079 | } else if (!r5l_has_free_space(log, reserve)) { | |
1080 | if (sh->log_start == log->last_checkpoint) | |
1081 | BUG(); | |
1082 | else | |
1083 | r5l_add_no_space_stripe(log, sh); | |
1084 | } else { | |
1085 | ret = r5l_log_stripe(log, sh, data_pages, parity_pages); | |
1086 | if (ret) { | |
1087 | spin_lock_irq(&log->io_list_lock); | |
1088 | list_add_tail(&sh->log_list, | |
1089 | &log->no_mem_stripes); | |
1090 | spin_unlock_irq(&log->io_list_lock); | |
1091 | } | |
5036c390 | 1092 | } |
f6bed0ef | 1093 | } |
f6bed0ef | 1094 | |
5036c390 | 1095 | mutex_unlock(&log->io_mutex); |
a39f7afd SL |
1096 | if (wake_reclaim) |
1097 | r5l_wake_reclaim(log, reserve); | |
f6bed0ef SL |
1098 | return 0; |
1099 | } | |
1100 | ||
1101 | void r5l_write_stripe_run(struct r5l_log *log) | |
1102 | { | |
1103 | if (!log) | |
1104 | return; | |
1105 | mutex_lock(&log->io_mutex); | |
1106 | r5l_submit_current_io(log); | |
1107 | mutex_unlock(&log->io_mutex); | |
1108 | } | |
1109 | ||
828cbe98 SL |
1110 | int r5l_handle_flush_request(struct r5l_log *log, struct bio *bio) |
1111 | { | |
3bddb7f8 SL |
1112 | if (log->r5c_journal_mode == R5C_JOURNAL_MODE_WRITE_THROUGH) { |
1113 | /* | |
1114 | * in write through (journal only) | |
1115 | * we flush log disk cache first, then write stripe data to | |
1116 | * raid disks. So if bio is finished, the log disk cache is | |
1117 | * flushed already. The recovery guarantees we can recovery | |
1118 | * the bio from log disk, so we don't need to flush again | |
1119 | */ | |
1120 | if (bio->bi_iter.bi_size == 0) { | |
1121 | bio_endio(bio); | |
1122 | return 0; | |
1123 | } | |
1124 | bio->bi_opf &= ~REQ_PREFLUSH; | |
1125 | } else { | |
1126 | /* write back (with cache) */ | |
1127 | if (bio->bi_iter.bi_size == 0) { | |
1128 | mutex_lock(&log->io_mutex); | |
1129 | r5l_get_meta(log, 0); | |
1130 | bio_list_add(&log->current_io->flush_barriers, bio); | |
1131 | log->current_io->has_flush = 1; | |
1132 | log->current_io->has_null_flush = 1; | |
1133 | atomic_inc(&log->current_io->pending_stripe); | |
1134 | r5l_submit_current_io(log); | |
1135 | mutex_unlock(&log->io_mutex); | |
1136 | return 0; | |
1137 | } | |
828cbe98 | 1138 | } |
828cbe98 SL |
1139 | return -EAGAIN; |
1140 | } | |
1141 | ||
f6bed0ef SL |
1142 | /* This will run after log space is reclaimed */ |
1143 | static void r5l_run_no_space_stripes(struct r5l_log *log) | |
1144 | { | |
1145 | struct stripe_head *sh; | |
1146 | ||
1147 | spin_lock(&log->no_space_stripes_lock); | |
1148 | while (!list_empty(&log->no_space_stripes)) { | |
1149 | sh = list_first_entry(&log->no_space_stripes, | |
1150 | struct stripe_head, log_list); | |
1151 | list_del_init(&sh->log_list); | |
1152 | set_bit(STRIPE_HANDLE, &sh->state); | |
1153 | raid5_release_stripe(sh); | |
1154 | } | |
1155 | spin_unlock(&log->no_space_stripes_lock); | |
1156 | } | |
1157 | ||
a39f7afd SL |
1158 | /* |
1159 | * calculate new last_checkpoint | |
1160 | * for write through mode, returns log->next_checkpoint | |
1161 | * for write back, returns log_start of first sh in stripe_in_journal_list | |
1162 | */ | |
1163 | static sector_t r5c_calculate_new_cp(struct r5conf *conf) | |
1164 | { | |
1165 | struct stripe_head *sh; | |
1166 | struct r5l_log *log = conf->log; | |
1167 | sector_t new_cp; | |
1168 | unsigned long flags; | |
1169 | ||
1170 | if (log->r5c_journal_mode == R5C_JOURNAL_MODE_WRITE_THROUGH) | |
1171 | return log->next_checkpoint; | |
1172 | ||
1173 | spin_lock_irqsave(&log->stripe_in_journal_lock, flags); | |
1174 | if (list_empty(&conf->log->stripe_in_journal_list)) { | |
1175 | /* all stripes flushed */ | |
d3014e21 | 1176 | spin_unlock_irqrestore(&log->stripe_in_journal_lock, flags); |
a39f7afd SL |
1177 | return log->next_checkpoint; |
1178 | } | |
1179 | sh = list_first_entry(&conf->log->stripe_in_journal_list, | |
1180 | struct stripe_head, r5c); | |
1181 | new_cp = sh->log_start; | |
1182 | spin_unlock_irqrestore(&log->stripe_in_journal_lock, flags); | |
1183 | return new_cp; | |
1184 | } | |
1185 | ||
17036461 CH |
1186 | static sector_t r5l_reclaimable_space(struct r5l_log *log) |
1187 | { | |
a39f7afd SL |
1188 | struct r5conf *conf = log->rdev->mddev->private; |
1189 | ||
17036461 | 1190 | return r5l_ring_distance(log, log->last_checkpoint, |
a39f7afd | 1191 | r5c_calculate_new_cp(conf)); |
17036461 CH |
1192 | } |
1193 | ||
5036c390 CH |
1194 | static void r5l_run_no_mem_stripe(struct r5l_log *log) |
1195 | { | |
1196 | struct stripe_head *sh; | |
1197 | ||
efa4b77b | 1198 | lockdep_assert_held(&log->io_list_lock); |
5036c390 CH |
1199 | |
1200 | if (!list_empty(&log->no_mem_stripes)) { | |
1201 | sh = list_first_entry(&log->no_mem_stripes, | |
1202 | struct stripe_head, log_list); | |
1203 | list_del_init(&sh->log_list); | |
1204 | set_bit(STRIPE_HANDLE, &sh->state); | |
1205 | raid5_release_stripe(sh); | |
1206 | } | |
1207 | } | |
1208 | ||
04732f74 | 1209 | static bool r5l_complete_finished_ios(struct r5l_log *log) |
17036461 CH |
1210 | { |
1211 | struct r5l_io_unit *io, *next; | |
1212 | bool found = false; | |
1213 | ||
efa4b77b | 1214 | lockdep_assert_held(&log->io_list_lock); |
17036461 | 1215 | |
04732f74 | 1216 | list_for_each_entry_safe(io, next, &log->finished_ios, log_sibling) { |
17036461 CH |
1217 | /* don't change list order */ |
1218 | if (io->state < IO_UNIT_STRIPE_END) | |
1219 | break; | |
1220 | ||
1221 | log->next_checkpoint = io->log_start; | |
17036461 CH |
1222 | |
1223 | list_del(&io->log_sibling); | |
afeee514 | 1224 | mempool_free(io, &log->io_pool); |
5036c390 | 1225 | r5l_run_no_mem_stripe(log); |
17036461 CH |
1226 | |
1227 | found = true; | |
1228 | } | |
1229 | ||
1230 | return found; | |
1231 | } | |
1232 | ||
509ffec7 CH |
1233 | static void __r5l_stripe_write_finished(struct r5l_io_unit *io) |
1234 | { | |
1235 | struct r5l_log *log = io->log; | |
a39f7afd | 1236 | struct r5conf *conf = log->rdev->mddev->private; |
509ffec7 CH |
1237 | unsigned long flags; |
1238 | ||
1239 | spin_lock_irqsave(&log->io_list_lock, flags); | |
1240 | __r5l_set_io_unit_state(io, IO_UNIT_STRIPE_END); | |
17036461 | 1241 | |
04732f74 | 1242 | if (!r5l_complete_finished_ios(log)) { |
85f2f9a4 SL |
1243 | spin_unlock_irqrestore(&log->io_list_lock, flags); |
1244 | return; | |
1245 | } | |
509ffec7 | 1246 | |
a39f7afd SL |
1247 | if (r5l_reclaimable_space(log) > log->max_free_space || |
1248 | test_bit(R5C_LOG_TIGHT, &conf->cache_state)) | |
509ffec7 CH |
1249 | r5l_wake_reclaim(log, 0); |
1250 | ||
509ffec7 CH |
1251 | spin_unlock_irqrestore(&log->io_list_lock, flags); |
1252 | wake_up(&log->iounit_wait); | |
1253 | } | |
1254 | ||
0576b1c6 SL |
1255 | void r5l_stripe_write_finished(struct stripe_head *sh) |
1256 | { | |
1257 | struct r5l_io_unit *io; | |
1258 | ||
0576b1c6 | 1259 | io = sh->log_io; |
0576b1c6 SL |
1260 | sh->log_io = NULL; |
1261 | ||
509ffec7 CH |
1262 | if (io && atomic_dec_and_test(&io->pending_stripe)) |
1263 | __r5l_stripe_write_finished(io); | |
0576b1c6 SL |
1264 | } |
1265 | ||
a8c34f91 SL |
1266 | static void r5l_log_flush_endio(struct bio *bio) |
1267 | { | |
1268 | struct r5l_log *log = container_of(bio, struct r5l_log, | |
1269 | flush_bio); | |
1270 | unsigned long flags; | |
1271 | struct r5l_io_unit *io; | |
a8c34f91 | 1272 | |
4e4cbee9 | 1273 | if (bio->bi_status) |
6e74a9cf SL |
1274 | md_error(log->rdev->mddev, log->rdev); |
1275 | ||
a8c34f91 | 1276 | spin_lock_irqsave(&log->io_list_lock, flags); |
d8858f43 CH |
1277 | list_for_each_entry(io, &log->flushing_ios, log_sibling) |
1278 | r5l_io_run_stripes(io); | |
04732f74 | 1279 | list_splice_tail_init(&log->flushing_ios, &log->finished_ios); |
a8c34f91 SL |
1280 | spin_unlock_irqrestore(&log->io_list_lock, flags); |
1281 | } | |
1282 | ||
0576b1c6 SL |
1283 | /* |
1284 | * Starting dispatch IO to raid. | |
1285 | * io_unit(meta) consists of a log. There is one situation we want to avoid. A | |
1286 | * broken meta in the middle of a log causes recovery can't find meta at the | |
1287 | * head of log. If operations require meta at the head persistent in log, we | |
1288 | * must make sure meta before it persistent in log too. A case is: | |
1289 | * | |
1290 | * stripe data/parity is in log, we start write stripe to raid disks. stripe | |
1291 | * data/parity must be persistent in log before we do the write to raid disks. | |
1292 | * | |
1293 | * The solution is we restrictly maintain io_unit list order. In this case, we | |
1294 | * only write stripes of an io_unit to raid disks till the io_unit is the first | |
1295 | * one whose data/parity is in log. | |
1296 | */ | |
1297 | void r5l_flush_stripe_to_raid(struct r5l_log *log) | |
1298 | { | |
a8c34f91 | 1299 | bool do_flush; |
56fef7c6 CH |
1300 | |
1301 | if (!log || !log->need_cache_flush) | |
0576b1c6 | 1302 | return; |
0576b1c6 SL |
1303 | |
1304 | spin_lock_irq(&log->io_list_lock); | |
a8c34f91 SL |
1305 | /* flush bio is running */ |
1306 | if (!list_empty(&log->flushing_ios)) { | |
1307 | spin_unlock_irq(&log->io_list_lock); | |
1308 | return; | |
0576b1c6 | 1309 | } |
a8c34f91 SL |
1310 | list_splice_tail_init(&log->io_end_ios, &log->flushing_ios); |
1311 | do_flush = !list_empty(&log->flushing_ios); | |
0576b1c6 | 1312 | spin_unlock_irq(&log->io_list_lock); |
a8c34f91 SL |
1313 | |
1314 | if (!do_flush) | |
1315 | return; | |
1316 | bio_reset(&log->flush_bio); | |
74d46992 | 1317 | bio_set_dev(&log->flush_bio, log->rdev->bdev); |
a8c34f91 | 1318 | log->flush_bio.bi_end_io = r5l_log_flush_endio; |
70fd7614 | 1319 | log->flush_bio.bi_opf = REQ_OP_WRITE | REQ_PREFLUSH; |
4e49ea4a | 1320 | submit_bio(&log->flush_bio); |
0576b1c6 SL |
1321 | } |
1322 | ||
0576b1c6 | 1323 | static void r5l_write_super(struct r5l_log *log, sector_t cp); |
4b482044 SL |
1324 | static void r5l_write_super_and_discard_space(struct r5l_log *log, |
1325 | sector_t end) | |
1326 | { | |
1327 | struct block_device *bdev = log->rdev->bdev; | |
1328 | struct mddev *mddev; | |
1329 | ||
1330 | r5l_write_super(log, end); | |
1331 | ||
1332 | if (!blk_queue_discard(bdev_get_queue(bdev))) | |
1333 | return; | |
1334 | ||
1335 | mddev = log->rdev->mddev; | |
1336 | /* | |
8e018c21 SL |
1337 | * Discard could zero data, so before discard we must make sure |
1338 | * superblock is updated to new log tail. Updating superblock (either | |
1339 | * directly call md_update_sb() or depend on md thread) must hold | |
1340 | * reconfig mutex. On the other hand, raid5_quiesce is called with | |
1341 | * reconfig_mutex hold. The first step of raid5_quiesce() is waitting | |
1342 | * for all IO finish, hence waitting for reclaim thread, while reclaim | |
1343 | * thread is calling this function and waitting for reconfig mutex. So | |
1344 | * there is a deadlock. We workaround this issue with a trylock. | |
1345 | * FIXME: we could miss discard if we can't take reconfig mutex | |
4b482044 | 1346 | */ |
2953079c SL |
1347 | set_mask_bits(&mddev->sb_flags, 0, |
1348 | BIT(MD_SB_CHANGE_DEVS) | BIT(MD_SB_CHANGE_PENDING)); | |
8e018c21 SL |
1349 | if (!mddev_trylock(mddev)) |
1350 | return; | |
1351 | md_update_sb(mddev, 1); | |
1352 | mddev_unlock(mddev); | |
4b482044 | 1353 | |
6e74a9cf | 1354 | /* discard IO error really doesn't matter, ignore it */ |
4b482044 SL |
1355 | if (log->last_checkpoint < end) { |
1356 | blkdev_issue_discard(bdev, | |
1357 | log->last_checkpoint + log->rdev->data_offset, | |
1358 | end - log->last_checkpoint, GFP_NOIO, 0); | |
1359 | } else { | |
1360 | blkdev_issue_discard(bdev, | |
1361 | log->last_checkpoint + log->rdev->data_offset, | |
1362 | log->device_size - log->last_checkpoint, | |
1363 | GFP_NOIO, 0); | |
1364 | blkdev_issue_discard(bdev, log->rdev->data_offset, end, | |
1365 | GFP_NOIO, 0); | |
1366 | } | |
1367 | } | |
1368 | ||
a39f7afd SL |
1369 | /* |
1370 | * r5c_flush_stripe moves stripe from cached list to handle_list. When called, | |
1371 | * the stripe must be on r5c_cached_full_stripes or r5c_cached_partial_stripes. | |
1372 | * | |
1373 | * must hold conf->device_lock | |
1374 | */ | |
1375 | static void r5c_flush_stripe(struct r5conf *conf, struct stripe_head *sh) | |
0576b1c6 | 1376 | { |
a39f7afd SL |
1377 | BUG_ON(list_empty(&sh->lru)); |
1378 | BUG_ON(!test_bit(STRIPE_R5C_CACHING, &sh->state)); | |
1379 | BUG_ON(test_bit(STRIPE_HANDLE, &sh->state)); | |
0576b1c6 | 1380 | |
0576b1c6 | 1381 | /* |
a39f7afd SL |
1382 | * The stripe is not ON_RELEASE_LIST, so it is safe to call |
1383 | * raid5_release_stripe() while holding conf->device_lock | |
0576b1c6 | 1384 | */ |
a39f7afd | 1385 | BUG_ON(test_bit(STRIPE_ON_RELEASE_LIST, &sh->state)); |
efa4b77b | 1386 | lockdep_assert_held(&conf->device_lock); |
0576b1c6 | 1387 | |
a39f7afd SL |
1388 | list_del_init(&sh->lru); |
1389 | atomic_inc(&sh->count); | |
17036461 | 1390 | |
a39f7afd SL |
1391 | set_bit(STRIPE_HANDLE, &sh->state); |
1392 | atomic_inc(&conf->active_stripes); | |
1393 | r5c_make_stripe_write_out(sh); | |
0576b1c6 | 1394 | |
e33fbb9c SL |
1395 | if (test_bit(STRIPE_R5C_PARTIAL_STRIPE, &sh->state)) |
1396 | atomic_inc(&conf->r5c_flushing_partial_stripes); | |
1397 | else | |
1398 | atomic_inc(&conf->r5c_flushing_full_stripes); | |
a39f7afd SL |
1399 | raid5_release_stripe(sh); |
1400 | } | |
1401 | ||
1402 | /* | |
1403 | * if num == 0, flush all full stripes | |
1404 | * if num > 0, flush all full stripes. If less than num full stripes are | |
1405 | * flushed, flush some partial stripes until totally num stripes are | |
1406 | * flushed or there is no more cached stripes. | |
1407 | */ | |
1408 | void r5c_flush_cache(struct r5conf *conf, int num) | |
1409 | { | |
1410 | int count; | |
1411 | struct stripe_head *sh, *next; | |
1412 | ||
efa4b77b | 1413 | lockdep_assert_held(&conf->device_lock); |
a39f7afd | 1414 | if (!conf->log) |
0576b1c6 SL |
1415 | return; |
1416 | ||
a39f7afd SL |
1417 | count = 0; |
1418 | list_for_each_entry_safe(sh, next, &conf->r5c_full_stripe_list, lru) { | |
1419 | r5c_flush_stripe(conf, sh); | |
1420 | count++; | |
1421 | } | |
1422 | ||
1423 | if (count >= num) | |
1424 | return; | |
1425 | list_for_each_entry_safe(sh, next, | |
1426 | &conf->r5c_partial_stripe_list, lru) { | |
1427 | r5c_flush_stripe(conf, sh); | |
1428 | if (++count >= num) | |
1429 | break; | |
1430 | } | |
1431 | } | |
1432 | ||
1433 | static void r5c_do_reclaim(struct r5conf *conf) | |
1434 | { | |
1435 | struct r5l_log *log = conf->log; | |
1436 | struct stripe_head *sh; | |
1437 | int count = 0; | |
1438 | unsigned long flags; | |
1439 | int total_cached; | |
1440 | int stripes_to_flush; | |
e33fbb9c | 1441 | int flushing_partial, flushing_full; |
a39f7afd SL |
1442 | |
1443 | if (!r5c_is_writeback(log)) | |
1444 | return; | |
1445 | ||
e33fbb9c SL |
1446 | flushing_partial = atomic_read(&conf->r5c_flushing_partial_stripes); |
1447 | flushing_full = atomic_read(&conf->r5c_flushing_full_stripes); | |
a39f7afd | 1448 | total_cached = atomic_read(&conf->r5c_cached_partial_stripes) + |
e33fbb9c SL |
1449 | atomic_read(&conf->r5c_cached_full_stripes) - |
1450 | flushing_full - flushing_partial; | |
a39f7afd SL |
1451 | |
1452 | if (total_cached > conf->min_nr_stripes * 3 / 4 || | |
1453 | atomic_read(&conf->empty_inactive_list_nr) > 0) | |
1454 | /* | |
1455 | * if stripe cache pressure high, flush all full stripes and | |
1456 | * some partial stripes | |
1457 | */ | |
1458 | stripes_to_flush = R5C_RECLAIM_STRIPE_GROUP; | |
1459 | else if (total_cached > conf->min_nr_stripes * 1 / 2 || | |
e33fbb9c | 1460 | atomic_read(&conf->r5c_cached_full_stripes) - flushing_full > |
84890c03 | 1461 | R5C_FULL_STRIPE_FLUSH_BATCH(conf)) |
a39f7afd SL |
1462 | /* |
1463 | * if stripe cache pressure moderate, or if there is many full | |
1464 | * stripes,flush all full stripes | |
1465 | */ | |
1466 | stripes_to_flush = 0; | |
1467 | else | |
1468 | /* no need to flush */ | |
1469 | stripes_to_flush = -1; | |
1470 | ||
1471 | if (stripes_to_flush >= 0) { | |
1472 | spin_lock_irqsave(&conf->device_lock, flags); | |
1473 | r5c_flush_cache(conf, stripes_to_flush); | |
1474 | spin_unlock_irqrestore(&conf->device_lock, flags); | |
1475 | } | |
1476 | ||
1477 | /* if log space is tight, flush stripes on stripe_in_journal_list */ | |
1478 | if (test_bit(R5C_LOG_TIGHT, &conf->cache_state)) { | |
1479 | spin_lock_irqsave(&log->stripe_in_journal_lock, flags); | |
1480 | spin_lock(&conf->device_lock); | |
1481 | list_for_each_entry(sh, &log->stripe_in_journal_list, r5c) { | |
1482 | /* | |
1483 | * stripes on stripe_in_journal_list could be in any | |
1484 | * state of the stripe_cache state machine. In this | |
1485 | * case, we only want to flush stripe on | |
1486 | * r5c_cached_full/partial_stripes. The following | |
1487 | * condition makes sure the stripe is on one of the | |
1488 | * two lists. | |
1489 | */ | |
1490 | if (!list_empty(&sh->lru) && | |
1491 | !test_bit(STRIPE_HANDLE, &sh->state) && | |
1492 | atomic_read(&sh->count) == 0) { | |
1493 | r5c_flush_stripe(conf, sh); | |
e8fd52ee SL |
1494 | if (count++ >= R5C_RECLAIM_STRIPE_GROUP) |
1495 | break; | |
a39f7afd | 1496 | } |
a39f7afd SL |
1497 | } |
1498 | spin_unlock(&conf->device_lock); | |
1499 | spin_unlock_irqrestore(&log->stripe_in_journal_lock, flags); | |
1500 | } | |
f687a33e SL |
1501 | |
1502 | if (!test_bit(R5C_LOG_CRITICAL, &conf->cache_state)) | |
1503 | r5l_run_no_space_stripes(log); | |
1504 | ||
a39f7afd SL |
1505 | md_wakeup_thread(conf->mddev->thread); |
1506 | } | |
1507 | ||
0576b1c6 SL |
1508 | static void r5l_do_reclaim(struct r5l_log *log) |
1509 | { | |
a39f7afd | 1510 | struct r5conf *conf = log->rdev->mddev->private; |
0576b1c6 | 1511 | sector_t reclaim_target = xchg(&log->reclaim_target, 0); |
17036461 CH |
1512 | sector_t reclaimable; |
1513 | sector_t next_checkpoint; | |
a39f7afd | 1514 | bool write_super; |
0576b1c6 SL |
1515 | |
1516 | spin_lock_irq(&log->io_list_lock); | |
a39f7afd SL |
1517 | write_super = r5l_reclaimable_space(log) > log->max_free_space || |
1518 | reclaim_target != 0 || !list_empty(&log->no_space_stripes); | |
0576b1c6 SL |
1519 | /* |
1520 | * move proper io_unit to reclaim list. We should not change the order. | |
1521 | * reclaimable/unreclaimable io_unit can be mixed in the list, we | |
1522 | * shouldn't reuse space of an unreclaimable io_unit | |
1523 | */ | |
1524 | while (1) { | |
17036461 CH |
1525 | reclaimable = r5l_reclaimable_space(log); |
1526 | if (reclaimable >= reclaim_target || | |
0576b1c6 SL |
1527 | (list_empty(&log->running_ios) && |
1528 | list_empty(&log->io_end_ios) && | |
a8c34f91 | 1529 | list_empty(&log->flushing_ios) && |
04732f74 | 1530 | list_empty(&log->finished_ios))) |
0576b1c6 SL |
1531 | break; |
1532 | ||
17036461 CH |
1533 | md_wakeup_thread(log->rdev->mddev->thread); |
1534 | wait_event_lock_irq(log->iounit_wait, | |
1535 | r5l_reclaimable_space(log) > reclaimable, | |
1536 | log->io_list_lock); | |
0576b1c6 | 1537 | } |
17036461 | 1538 | |
a39f7afd | 1539 | next_checkpoint = r5c_calculate_new_cp(conf); |
0576b1c6 SL |
1540 | spin_unlock_irq(&log->io_list_lock); |
1541 | ||
a39f7afd | 1542 | if (reclaimable == 0 || !write_super) |
0576b1c6 SL |
1543 | return; |
1544 | ||
0576b1c6 SL |
1545 | /* |
1546 | * write_super will flush cache of each raid disk. We must write super | |
1547 | * here, because the log area might be reused soon and we don't want to | |
1548 | * confuse recovery | |
1549 | */ | |
4b482044 | 1550 | r5l_write_super_and_discard_space(log, next_checkpoint); |
0576b1c6 SL |
1551 | |
1552 | mutex_lock(&log->io_mutex); | |
17036461 | 1553 | log->last_checkpoint = next_checkpoint; |
a39f7afd | 1554 | r5c_update_log_state(log); |
0576b1c6 | 1555 | mutex_unlock(&log->io_mutex); |
0576b1c6 | 1556 | |
17036461 | 1557 | r5l_run_no_space_stripes(log); |
0576b1c6 SL |
1558 | } |
1559 | ||
1560 | static void r5l_reclaim_thread(struct md_thread *thread) | |
1561 | { | |
1562 | struct mddev *mddev = thread->mddev; | |
1563 | struct r5conf *conf = mddev->private; | |
1564 | struct r5l_log *log = conf->log; | |
1565 | ||
1566 | if (!log) | |
1567 | return; | |
a39f7afd | 1568 | r5c_do_reclaim(conf); |
0576b1c6 SL |
1569 | r5l_do_reclaim(log); |
1570 | } | |
1571 | ||
a39f7afd | 1572 | void r5l_wake_reclaim(struct r5l_log *log, sector_t space) |
f6bed0ef | 1573 | { |
0576b1c6 SL |
1574 | unsigned long target; |
1575 | unsigned long new = (unsigned long)space; /* overflow in theory */ | |
1576 | ||
a39f7afd SL |
1577 | if (!log) |
1578 | return; | |
0576b1c6 SL |
1579 | do { |
1580 | target = log->reclaim_target; | |
1581 | if (new < target) | |
1582 | return; | |
1583 | } while (cmpxchg(&log->reclaim_target, target, new) != target); | |
1584 | md_wakeup_thread(log->reclaim_thread); | |
f6bed0ef SL |
1585 | } |
1586 | ||
b03e0ccb | 1587 | void r5l_quiesce(struct r5l_log *log, int quiesce) |
e6c033f7 | 1588 | { |
4b482044 | 1589 | struct mddev *mddev; |
b03e0ccb N |
1590 | |
1591 | if (quiesce) { | |
4b482044 SL |
1592 | /* make sure r5l_write_super_and_discard_space exits */ |
1593 | mddev = log->rdev->mddev; | |
1594 | wake_up(&mddev->sb_wait); | |
ce1ccd07 | 1595 | kthread_park(log->reclaim_thread->tsk); |
a39f7afd | 1596 | r5l_wake_reclaim(log, MaxSector); |
e6c033f7 | 1597 | r5l_do_reclaim(log); |
b03e0ccb N |
1598 | } else |
1599 | kthread_unpark(log->reclaim_thread->tsk); | |
e6c033f7 SL |
1600 | } |
1601 | ||
6e74a9cf SL |
1602 | bool r5l_log_disk_error(struct r5conf *conf) |
1603 | { | |
f6b6ec5c SL |
1604 | struct r5l_log *log; |
1605 | bool ret; | |
7dde2ad3 | 1606 | /* don't allow write if journal disk is missing */ |
f6b6ec5c SL |
1607 | rcu_read_lock(); |
1608 | log = rcu_dereference(conf->log); | |
1609 | ||
1610 | if (!log) | |
1611 | ret = test_bit(MD_HAS_JOURNAL, &conf->mddev->flags); | |
1612 | else | |
1613 | ret = test_bit(Faulty, &log->rdev->flags); | |
1614 | rcu_read_unlock(); | |
1615 | return ret; | |
6e74a9cf SL |
1616 | } |
1617 | ||
effe6ee7 SL |
1618 | #define R5L_RECOVERY_PAGE_POOL_SIZE 256 |
1619 | ||
355810d1 SL |
1620 | struct r5l_recovery_ctx { |
1621 | struct page *meta_page; /* current meta */ | |
1622 | sector_t meta_total_blocks; /* total size of current meta and data */ | |
1623 | sector_t pos; /* recovery position */ | |
1624 | u64 seq; /* recovery position seq */ | |
b4c625c6 SL |
1625 | int data_parity_stripes; /* number of data_parity stripes */ |
1626 | int data_only_stripes; /* number of data_only stripes */ | |
1627 | struct list_head cached_list; | |
effe6ee7 SL |
1628 | |
1629 | /* | |
1630 | * read ahead page pool (ra_pool) | |
1631 | * in recovery, log is read sequentially. It is not efficient to | |
1632 | * read every page with sync_page_io(). The read ahead page pool | |
1633 | * reads multiple pages with one IO, so further log read can | |
1634 | * just copy data from the pool. | |
1635 | */ | |
1636 | struct page *ra_pool[R5L_RECOVERY_PAGE_POOL_SIZE]; | |
1637 | sector_t pool_offset; /* offset of first page in the pool */ | |
1638 | int total_pages; /* total allocated pages */ | |
1639 | int valid_pages; /* pages with valid data */ | |
1640 | struct bio *ra_bio; /* bio to do the read ahead */ | |
355810d1 SL |
1641 | }; |
1642 | ||
effe6ee7 SL |
1643 | static int r5l_recovery_allocate_ra_pool(struct r5l_log *log, |
1644 | struct r5l_recovery_ctx *ctx) | |
1645 | { | |
1646 | struct page *page; | |
1647 | ||
afeee514 | 1648 | ctx->ra_bio = bio_alloc_bioset(GFP_KERNEL, BIO_MAX_PAGES, &log->bs); |
effe6ee7 SL |
1649 | if (!ctx->ra_bio) |
1650 | return -ENOMEM; | |
1651 | ||
1652 | ctx->valid_pages = 0; | |
1653 | ctx->total_pages = 0; | |
1654 | while (ctx->total_pages < R5L_RECOVERY_PAGE_POOL_SIZE) { | |
1655 | page = alloc_page(GFP_KERNEL); | |
1656 | ||
1657 | if (!page) | |
1658 | break; | |
1659 | ctx->ra_pool[ctx->total_pages] = page; | |
1660 | ctx->total_pages += 1; | |
1661 | } | |
1662 | ||
1663 | if (ctx->total_pages == 0) { | |
1664 | bio_put(ctx->ra_bio); | |
1665 | return -ENOMEM; | |
1666 | } | |
1667 | ||
1668 | ctx->pool_offset = 0; | |
1669 | return 0; | |
1670 | } | |
1671 | ||
1672 | static void r5l_recovery_free_ra_pool(struct r5l_log *log, | |
1673 | struct r5l_recovery_ctx *ctx) | |
1674 | { | |
1675 | int i; | |
1676 | ||
1677 | for (i = 0; i < ctx->total_pages; ++i) | |
1678 | put_page(ctx->ra_pool[i]); | |
1679 | bio_put(ctx->ra_bio); | |
1680 | } | |
1681 | ||
1682 | /* | |
1683 | * fetch ctx->valid_pages pages from offset | |
1684 | * In normal cases, ctx->valid_pages == ctx->total_pages after the call. | |
1685 | * However, if the offset is close to the end of the journal device, | |
1686 | * ctx->valid_pages could be smaller than ctx->total_pages | |
1687 | */ | |
1688 | static int r5l_recovery_fetch_ra_pool(struct r5l_log *log, | |
1689 | struct r5l_recovery_ctx *ctx, | |
1690 | sector_t offset) | |
1691 | { | |
1692 | bio_reset(ctx->ra_bio); | |
74d46992 | 1693 | bio_set_dev(ctx->ra_bio, log->rdev->bdev); |
effe6ee7 SL |
1694 | bio_set_op_attrs(ctx->ra_bio, REQ_OP_READ, 0); |
1695 | ctx->ra_bio->bi_iter.bi_sector = log->rdev->data_offset + offset; | |
1696 | ||
1697 | ctx->valid_pages = 0; | |
1698 | ctx->pool_offset = offset; | |
1699 | ||
1700 | while (ctx->valid_pages < ctx->total_pages) { | |
1701 | bio_add_page(ctx->ra_bio, | |
1702 | ctx->ra_pool[ctx->valid_pages], PAGE_SIZE, 0); | |
1703 | ctx->valid_pages += 1; | |
1704 | ||
1705 | offset = r5l_ring_add(log, offset, BLOCK_SECTORS); | |
1706 | ||
1707 | if (offset == 0) /* reached end of the device */ | |
1708 | break; | |
1709 | } | |
1710 | ||
1711 | return submit_bio_wait(ctx->ra_bio); | |
1712 | } | |
1713 | ||
1714 | /* | |
1715 | * try read a page from the read ahead page pool, if the page is not in the | |
1716 | * pool, call r5l_recovery_fetch_ra_pool | |
1717 | */ | |
1718 | static int r5l_recovery_read_page(struct r5l_log *log, | |
1719 | struct r5l_recovery_ctx *ctx, | |
1720 | struct page *page, | |
1721 | sector_t offset) | |
1722 | { | |
1723 | int ret; | |
1724 | ||
1725 | if (offset < ctx->pool_offset || | |
1726 | offset >= ctx->pool_offset + ctx->valid_pages * BLOCK_SECTORS) { | |
1727 | ret = r5l_recovery_fetch_ra_pool(log, ctx, offset); | |
1728 | if (ret) | |
1729 | return ret; | |
1730 | } | |
1731 | ||
1732 | BUG_ON(offset < ctx->pool_offset || | |
1733 | offset >= ctx->pool_offset + ctx->valid_pages * BLOCK_SECTORS); | |
1734 | ||
1735 | memcpy(page_address(page), | |
1736 | page_address(ctx->ra_pool[(offset - ctx->pool_offset) >> | |
1737 | BLOCK_SECTOR_SHIFT]), | |
1738 | PAGE_SIZE); | |
1739 | return 0; | |
1740 | } | |
1741 | ||
9ed988f5 SL |
1742 | static int r5l_recovery_read_meta_block(struct r5l_log *log, |
1743 | struct r5l_recovery_ctx *ctx) | |
355810d1 SL |
1744 | { |
1745 | struct page *page = ctx->meta_page; | |
1746 | struct r5l_meta_block *mb; | |
1747 | u32 crc, stored_crc; | |
effe6ee7 | 1748 | int ret; |
355810d1 | 1749 | |
effe6ee7 SL |
1750 | ret = r5l_recovery_read_page(log, ctx, page, ctx->pos); |
1751 | if (ret != 0) | |
1752 | return ret; | |
355810d1 SL |
1753 | |
1754 | mb = page_address(page); | |
1755 | stored_crc = le32_to_cpu(mb->checksum); | |
1756 | mb->checksum = 0; | |
1757 | ||
1758 | if (le32_to_cpu(mb->magic) != R5LOG_MAGIC || | |
1759 | le64_to_cpu(mb->seq) != ctx->seq || | |
1760 | mb->version != R5LOG_VERSION || | |
1761 | le64_to_cpu(mb->position) != ctx->pos) | |
1762 | return -EINVAL; | |
1763 | ||
5cb2fbd6 | 1764 | crc = crc32c_le(log->uuid_checksum, mb, PAGE_SIZE); |
355810d1 SL |
1765 | if (stored_crc != crc) |
1766 | return -EINVAL; | |
1767 | ||
1768 | if (le32_to_cpu(mb->meta_size) > PAGE_SIZE) | |
1769 | return -EINVAL; | |
1770 | ||
1771 | ctx->meta_total_blocks = BLOCK_SECTORS; | |
1772 | ||
1773 | return 0; | |
1774 | } | |
1775 | ||
9ed988f5 SL |
1776 | static void |
1777 | r5l_recovery_create_empty_meta_block(struct r5l_log *log, | |
1778 | struct page *page, | |
1779 | sector_t pos, u64 seq) | |
355810d1 | 1780 | { |
355810d1 | 1781 | struct r5l_meta_block *mb; |
355810d1 | 1782 | |
355810d1 | 1783 | mb = page_address(page); |
9ed988f5 | 1784 | clear_page(mb); |
355810d1 SL |
1785 | mb->magic = cpu_to_le32(R5LOG_MAGIC); |
1786 | mb->version = R5LOG_VERSION; | |
1787 | mb->meta_size = cpu_to_le32(sizeof(struct r5l_meta_block)); | |
1788 | mb->seq = cpu_to_le64(seq); | |
1789 | mb->position = cpu_to_le64(pos); | |
9ed988f5 | 1790 | } |
355810d1 | 1791 | |
9ed988f5 SL |
1792 | static int r5l_log_write_empty_meta_block(struct r5l_log *log, sector_t pos, |
1793 | u64 seq) | |
1794 | { | |
1795 | struct page *page; | |
5c88f403 | 1796 | struct r5l_meta_block *mb; |
355810d1 | 1797 | |
9ed988f5 SL |
1798 | page = alloc_page(GFP_KERNEL); |
1799 | if (!page) | |
1800 | return -ENOMEM; | |
1801 | r5l_recovery_create_empty_meta_block(log, page, pos, seq); | |
5c88f403 SL |
1802 | mb = page_address(page); |
1803 | mb->checksum = cpu_to_le32(crc32c_le(log->uuid_checksum, | |
1804 | mb, PAGE_SIZE)); | |
796a5cf0 | 1805 | if (!sync_page_io(log->rdev, pos, PAGE_SIZE, page, REQ_OP_WRITE, |
5a8948f8 | 1806 | REQ_SYNC | REQ_FUA, false)) { |
355810d1 SL |
1807 | __free_page(page); |
1808 | return -EIO; | |
1809 | } | |
1810 | __free_page(page); | |
1811 | return 0; | |
1812 | } | |
355810d1 | 1813 | |
b4c625c6 SL |
1814 | /* |
1815 | * r5l_recovery_load_data and r5l_recovery_load_parity uses flag R5_Wantwrite | |
1816 | * to mark valid (potentially not flushed) data in the journal. | |
1817 | * | |
1818 | * We already verified checksum in r5l_recovery_verify_data_checksum_for_mb, | |
1819 | * so there should not be any mismatch here. | |
1820 | */ | |
1821 | static void r5l_recovery_load_data(struct r5l_log *log, | |
1822 | struct stripe_head *sh, | |
1823 | struct r5l_recovery_ctx *ctx, | |
1824 | struct r5l_payload_data_parity *payload, | |
1825 | sector_t log_offset) | |
1826 | { | |
1827 | struct mddev *mddev = log->rdev->mddev; | |
1828 | struct r5conf *conf = mddev->private; | |
1829 | int dd_idx; | |
1830 | ||
1831 | raid5_compute_sector(conf, | |
1832 | le64_to_cpu(payload->location), 0, | |
1833 | &dd_idx, sh); | |
effe6ee7 | 1834 | r5l_recovery_read_page(log, ctx, sh->dev[dd_idx].page, log_offset); |
b4c625c6 SL |
1835 | sh->dev[dd_idx].log_checksum = |
1836 | le32_to_cpu(payload->checksum[0]); | |
1837 | ctx->meta_total_blocks += BLOCK_SECTORS; | |
1838 | ||
1839 | set_bit(R5_Wantwrite, &sh->dev[dd_idx].flags); | |
1840 | set_bit(STRIPE_R5C_CACHING, &sh->state); | |
1841 | } | |
1842 | ||
1843 | static void r5l_recovery_load_parity(struct r5l_log *log, | |
1844 | struct stripe_head *sh, | |
1845 | struct r5l_recovery_ctx *ctx, | |
1846 | struct r5l_payload_data_parity *payload, | |
1847 | sector_t log_offset) | |
1848 | { | |
1849 | struct mddev *mddev = log->rdev->mddev; | |
1850 | struct r5conf *conf = mddev->private; | |
1851 | ||
1852 | ctx->meta_total_blocks += BLOCK_SECTORS * conf->max_degraded; | |
effe6ee7 | 1853 | r5l_recovery_read_page(log, ctx, sh->dev[sh->pd_idx].page, log_offset); |
b4c625c6 SL |
1854 | sh->dev[sh->pd_idx].log_checksum = |
1855 | le32_to_cpu(payload->checksum[0]); | |
1856 | set_bit(R5_Wantwrite, &sh->dev[sh->pd_idx].flags); | |
1857 | ||
1858 | if (sh->qd_idx >= 0) { | |
effe6ee7 SL |
1859 | r5l_recovery_read_page( |
1860 | log, ctx, sh->dev[sh->qd_idx].page, | |
1861 | r5l_ring_add(log, log_offset, BLOCK_SECTORS)); | |
b4c625c6 SL |
1862 | sh->dev[sh->qd_idx].log_checksum = |
1863 | le32_to_cpu(payload->checksum[1]); | |
1864 | set_bit(R5_Wantwrite, &sh->dev[sh->qd_idx].flags); | |
355810d1 | 1865 | } |
b4c625c6 SL |
1866 | clear_bit(STRIPE_R5C_CACHING, &sh->state); |
1867 | } | |
355810d1 | 1868 | |
b4c625c6 SL |
1869 | static void r5l_recovery_reset_stripe(struct stripe_head *sh) |
1870 | { | |
1871 | int i; | |
1872 | ||
1873 | sh->state = 0; | |
1874 | sh->log_start = MaxSector; | |
1875 | for (i = sh->disks; i--; ) | |
1876 | sh->dev[i].flags = 0; | |
1877 | } | |
1878 | ||
1879 | static void | |
1880 | r5l_recovery_replay_one_stripe(struct r5conf *conf, | |
1881 | struct stripe_head *sh, | |
1882 | struct r5l_recovery_ctx *ctx) | |
1883 | { | |
1884 | struct md_rdev *rdev, *rrdev; | |
1885 | int disk_index; | |
1886 | int data_count = 0; | |
355810d1 | 1887 | |
b4c625c6 | 1888 | for (disk_index = 0; disk_index < sh->disks; disk_index++) { |
355810d1 SL |
1889 | if (!test_bit(R5_Wantwrite, &sh->dev[disk_index].flags)) |
1890 | continue; | |
b4c625c6 SL |
1891 | if (disk_index == sh->qd_idx || disk_index == sh->pd_idx) |
1892 | continue; | |
1893 | data_count++; | |
355810d1 SL |
1894 | } |
1895 | ||
b4c625c6 SL |
1896 | /* |
1897 | * stripes that only have parity must have been flushed | |
1898 | * before the crash that we are now recovering from, so | |
1899 | * there is nothing more to recovery. | |
1900 | */ | |
1901 | if (data_count == 0) | |
1902 | goto out; | |
355810d1 | 1903 | |
b4c625c6 SL |
1904 | for (disk_index = 0; disk_index < sh->disks; disk_index++) { |
1905 | if (!test_bit(R5_Wantwrite, &sh->dev[disk_index].flags)) | |
355810d1 SL |
1906 | continue; |
1907 | ||
1908 | /* in case device is broken */ | |
b4c625c6 | 1909 | rcu_read_lock(); |
355810d1 | 1910 | rdev = rcu_dereference(conf->disks[disk_index].rdev); |
b4c625c6 SL |
1911 | if (rdev) { |
1912 | atomic_inc(&rdev->nr_pending); | |
1913 | rcu_read_unlock(); | |
1914 | sync_page_io(rdev, sh->sector, PAGE_SIZE, | |
796a5cf0 MC |
1915 | sh->dev[disk_index].page, REQ_OP_WRITE, 0, |
1916 | false); | |
b4c625c6 SL |
1917 | rdev_dec_pending(rdev, rdev->mddev); |
1918 | rcu_read_lock(); | |
1919 | } | |
355810d1 | 1920 | rrdev = rcu_dereference(conf->disks[disk_index].replacement); |
b4c625c6 SL |
1921 | if (rrdev) { |
1922 | atomic_inc(&rrdev->nr_pending); | |
1923 | rcu_read_unlock(); | |
1924 | sync_page_io(rrdev, sh->sector, PAGE_SIZE, | |
796a5cf0 MC |
1925 | sh->dev[disk_index].page, REQ_OP_WRITE, 0, |
1926 | false); | |
b4c625c6 SL |
1927 | rdev_dec_pending(rrdev, rrdev->mddev); |
1928 | rcu_read_lock(); | |
1929 | } | |
1930 | rcu_read_unlock(); | |
355810d1 | 1931 | } |
b4c625c6 SL |
1932 | ctx->data_parity_stripes++; |
1933 | out: | |
1934 | r5l_recovery_reset_stripe(sh); | |
1935 | } | |
1936 | ||
1937 | static struct stripe_head * | |
483cbbed AN |
1938 | r5c_recovery_alloc_stripe( |
1939 | struct r5conf *conf, | |
1940 | sector_t stripe_sect, | |
1941 | int noblock) | |
b4c625c6 SL |
1942 | { |
1943 | struct stripe_head *sh; | |
1944 | ||
483cbbed | 1945 | sh = raid5_get_active_stripe(conf, stripe_sect, 0, noblock, 0); |
b4c625c6 SL |
1946 | if (!sh) |
1947 | return NULL; /* no more stripe available */ | |
1948 | ||
1949 | r5l_recovery_reset_stripe(sh); | |
b4c625c6 SL |
1950 | |
1951 | return sh; | |
1952 | } | |
1953 | ||
1954 | static struct stripe_head * | |
1955 | r5c_recovery_lookup_stripe(struct list_head *list, sector_t sect) | |
1956 | { | |
1957 | struct stripe_head *sh; | |
1958 | ||
1959 | list_for_each_entry(sh, list, lru) | |
1960 | if (sh->sector == sect) | |
1961 | return sh; | |
1962 | return NULL; | |
1963 | } | |
1964 | ||
1965 | static void | |
1966 | r5c_recovery_drop_stripes(struct list_head *cached_stripe_list, | |
1967 | struct r5l_recovery_ctx *ctx) | |
1968 | { | |
1969 | struct stripe_head *sh, *next; | |
1970 | ||
1971 | list_for_each_entry_safe(sh, next, cached_stripe_list, lru) { | |
1972 | r5l_recovery_reset_stripe(sh); | |
1973 | list_del_init(&sh->lru); | |
1974 | raid5_release_stripe(sh); | |
1975 | } | |
1976 | } | |
1977 | ||
1978 | static void | |
1979 | r5c_recovery_replay_stripes(struct list_head *cached_stripe_list, | |
1980 | struct r5l_recovery_ctx *ctx) | |
1981 | { | |
1982 | struct stripe_head *sh, *next; | |
1983 | ||
1984 | list_for_each_entry_safe(sh, next, cached_stripe_list, lru) | |
1985 | if (!test_bit(STRIPE_R5C_CACHING, &sh->state)) { | |
1986 | r5l_recovery_replay_one_stripe(sh->raid_conf, sh, ctx); | |
1987 | list_del_init(&sh->lru); | |
1988 | raid5_release_stripe(sh); | |
1989 | } | |
1990 | } | |
1991 | ||
1992 | /* if matches return 0; otherwise return -EINVAL */ | |
1993 | static int | |
effe6ee7 SL |
1994 | r5l_recovery_verify_data_checksum(struct r5l_log *log, |
1995 | struct r5l_recovery_ctx *ctx, | |
1996 | struct page *page, | |
b4c625c6 SL |
1997 | sector_t log_offset, __le32 log_checksum) |
1998 | { | |
1999 | void *addr; | |
2000 | u32 checksum; | |
2001 | ||
effe6ee7 | 2002 | r5l_recovery_read_page(log, ctx, page, log_offset); |
b4c625c6 SL |
2003 | addr = kmap_atomic(page); |
2004 | checksum = crc32c_le(log->uuid_checksum, addr, PAGE_SIZE); | |
2005 | kunmap_atomic(addr); | |
2006 | return (le32_to_cpu(log_checksum) == checksum) ? 0 : -EINVAL; | |
2007 | } | |
2008 | ||
2009 | /* | |
2010 | * before loading data to stripe cache, we need verify checksum for all data, | |
2011 | * if there is mismatch for any data page, we drop all data in the mata block | |
2012 | */ | |
2013 | static int | |
2014 | r5l_recovery_verify_data_checksum_for_mb(struct r5l_log *log, | |
2015 | struct r5l_recovery_ctx *ctx) | |
2016 | { | |
2017 | struct mddev *mddev = log->rdev->mddev; | |
2018 | struct r5conf *conf = mddev->private; | |
2019 | struct r5l_meta_block *mb = page_address(ctx->meta_page); | |
2020 | sector_t mb_offset = sizeof(struct r5l_meta_block); | |
2021 | sector_t log_offset = r5l_ring_add(log, ctx->pos, BLOCK_SECTORS); | |
2022 | struct page *page; | |
2023 | struct r5l_payload_data_parity *payload; | |
2d4f4687 | 2024 | struct r5l_payload_flush *payload_flush; |
b4c625c6 SL |
2025 | |
2026 | page = alloc_page(GFP_KERNEL); | |
2027 | if (!page) | |
2028 | return -ENOMEM; | |
2029 | ||
2030 | while (mb_offset < le32_to_cpu(mb->meta_size)) { | |
2031 | payload = (void *)mb + mb_offset; | |
2d4f4687 | 2032 | payload_flush = (void *)mb + mb_offset; |
b4c625c6 | 2033 | |
1ad45a9b | 2034 | if (le16_to_cpu(payload->header.type) == R5LOG_PAYLOAD_DATA) { |
b4c625c6 | 2035 | if (r5l_recovery_verify_data_checksum( |
effe6ee7 | 2036 | log, ctx, page, log_offset, |
b4c625c6 SL |
2037 | payload->checksum[0]) < 0) |
2038 | goto mismatch; | |
1ad45a9b | 2039 | } else if (le16_to_cpu(payload->header.type) == R5LOG_PAYLOAD_PARITY) { |
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; | |
2044 | if (conf->max_degraded == 2 && /* q for RAID 6 */ | |
2045 | r5l_recovery_verify_data_checksum( | |
effe6ee7 | 2046 | log, ctx, page, |
b4c625c6 SL |
2047 | r5l_ring_add(log, log_offset, |
2048 | BLOCK_SECTORS), | |
2049 | payload->checksum[1]) < 0) | |
2050 | goto mismatch; | |
1ad45a9b | 2051 | } else if (le16_to_cpu(payload->header.type) == R5LOG_PAYLOAD_FLUSH) { |
2d4f4687 SL |
2052 | /* nothing to do for R5LOG_PAYLOAD_FLUSH here */ |
2053 | } else /* not R5LOG_PAYLOAD_DATA/PARITY/FLUSH */ | |
b4c625c6 SL |
2054 | goto mismatch; |
2055 | ||
1ad45a9b | 2056 | if (le16_to_cpu(payload->header.type) == R5LOG_PAYLOAD_FLUSH) { |
2d4f4687 SL |
2057 | mb_offset += sizeof(struct r5l_payload_flush) + |
2058 | le32_to_cpu(payload_flush->size); | |
2059 | } else { | |
2060 | /* DATA or PARITY payload */ | |
2061 | log_offset = r5l_ring_add(log, log_offset, | |
2062 | le32_to_cpu(payload->size)); | |
2063 | mb_offset += sizeof(struct r5l_payload_data_parity) + | |
2064 | sizeof(__le32) * | |
2065 | (le32_to_cpu(payload->size) >> (PAGE_SHIFT - 9)); | |
2066 | } | |
b4c625c6 | 2067 | |
b4c625c6 SL |
2068 | } |
2069 | ||
2070 | put_page(page); | |
355810d1 SL |
2071 | return 0; |
2072 | ||
b4c625c6 SL |
2073 | mismatch: |
2074 | put_page(page); | |
355810d1 SL |
2075 | return -EINVAL; |
2076 | } | |
2077 | ||
b4c625c6 SL |
2078 | /* |
2079 | * Analyze all data/parity pages in one meta block | |
2080 | * Returns: | |
2081 | * 0 for success | |
2082 | * -EINVAL for unknown playload type | |
2083 | * -EAGAIN for checksum mismatch of data page | |
2084 | * -ENOMEM for run out of memory (alloc_page failed or run out of stripes) | |
2085 | */ | |
2086 | static int | |
2087 | r5c_recovery_analyze_meta_block(struct r5l_log *log, | |
2088 | struct r5l_recovery_ctx *ctx, | |
2089 | struct list_head *cached_stripe_list) | |
355810d1 | 2090 | { |
b4c625c6 SL |
2091 | struct mddev *mddev = log->rdev->mddev; |
2092 | struct r5conf *conf = mddev->private; | |
355810d1 | 2093 | struct r5l_meta_block *mb; |
b4c625c6 | 2094 | struct r5l_payload_data_parity *payload; |
2d4f4687 | 2095 | struct r5l_payload_flush *payload_flush; |
b4c625c6 | 2096 | int mb_offset; |
355810d1 | 2097 | sector_t log_offset; |
b4c625c6 SL |
2098 | sector_t stripe_sect; |
2099 | struct stripe_head *sh; | |
2100 | int ret; | |
2101 | ||
2102 | /* | |
2103 | * for mismatch in data blocks, we will drop all data in this mb, but | |
2104 | * we will still read next mb for other data with FLUSH flag, as | |
2105 | * io_unit could finish out of order. | |
2106 | */ | |
2107 | ret = r5l_recovery_verify_data_checksum_for_mb(log, ctx); | |
2108 | if (ret == -EINVAL) | |
2109 | return -EAGAIN; | |
2110 | else if (ret) | |
2111 | return ret; /* -ENOMEM duo to alloc_page() failed */ | |
355810d1 SL |
2112 | |
2113 | mb = page_address(ctx->meta_page); | |
b4c625c6 | 2114 | mb_offset = sizeof(struct r5l_meta_block); |
355810d1 SL |
2115 | log_offset = r5l_ring_add(log, ctx->pos, BLOCK_SECTORS); |
2116 | ||
b4c625c6 | 2117 | while (mb_offset < le32_to_cpu(mb->meta_size)) { |
355810d1 SL |
2118 | int dd; |
2119 | ||
b4c625c6 | 2120 | payload = (void *)mb + mb_offset; |
2d4f4687 SL |
2121 | payload_flush = (void *)mb + mb_offset; |
2122 | ||
1ad45a9b | 2123 | if (le16_to_cpu(payload->header.type) == R5LOG_PAYLOAD_FLUSH) { |
2d4f4687 SL |
2124 | int i, count; |
2125 | ||
2126 | count = le32_to_cpu(payload_flush->size) / sizeof(__le64); | |
2127 | for (i = 0; i < count; ++i) { | |
2128 | stripe_sect = le64_to_cpu(payload_flush->flush_stripes[i]); | |
2129 | sh = r5c_recovery_lookup_stripe(cached_stripe_list, | |
2130 | stripe_sect); | |
2131 | if (sh) { | |
2132 | WARN_ON(test_bit(STRIPE_R5C_CACHING, &sh->state)); | |
2133 | r5l_recovery_reset_stripe(sh); | |
2134 | list_del_init(&sh->lru); | |
2135 | raid5_release_stripe(sh); | |
2136 | } | |
2137 | } | |
2138 | ||
2139 | mb_offset += sizeof(struct r5l_payload_flush) + | |
2140 | le32_to_cpu(payload_flush->size); | |
2141 | continue; | |
2142 | } | |
2143 | ||
2144 | /* DATA or PARITY payload */ | |
1ad45a9b | 2145 | stripe_sect = (le16_to_cpu(payload->header.type) == R5LOG_PAYLOAD_DATA) ? |
b4c625c6 SL |
2146 | raid5_compute_sector( |
2147 | conf, le64_to_cpu(payload->location), 0, &dd, | |
2148 | NULL) | |
2149 | : le64_to_cpu(payload->location); | |
2150 | ||
2151 | sh = r5c_recovery_lookup_stripe(cached_stripe_list, | |
2152 | stripe_sect); | |
2153 | ||
2154 | if (!sh) { | |
483cbbed | 2155 | sh = r5c_recovery_alloc_stripe(conf, stripe_sect, 1); |
b4c625c6 SL |
2156 | /* |
2157 | * cannot get stripe from raid5_get_active_stripe | |
2158 | * try replay some stripes | |
2159 | */ | |
2160 | if (!sh) { | |
2161 | r5c_recovery_replay_stripes( | |
2162 | cached_stripe_list, ctx); | |
2163 | sh = r5c_recovery_alloc_stripe( | |
483cbbed | 2164 | conf, stripe_sect, 1); |
b4c625c6 SL |
2165 | } |
2166 | if (!sh) { | |
483cbbed | 2167 | int new_size = conf->min_nr_stripes * 2; |
b4c625c6 SL |
2168 | pr_debug("md/raid:%s: Increasing stripe cache size to %d to recovery data on journal.\n", |
2169 | mdname(mddev), | |
483cbbed AN |
2170 | new_size); |
2171 | ret = raid5_set_cache_size(mddev, new_size); | |
2172 | if (conf->min_nr_stripes <= new_size / 2) { | |
2173 | pr_err("md/raid:%s: Cannot increase cache size, ret=%d, new_size=%d, min_nr_stripes=%d, max_nr_stripes=%d\n", | |
2174 | mdname(mddev), | |
2175 | ret, | |
2176 | new_size, | |
2177 | conf->min_nr_stripes, | |
2178 | conf->max_nr_stripes); | |
2179 | return -ENOMEM; | |
2180 | } | |
2181 | sh = r5c_recovery_alloc_stripe( | |
2182 | conf, stripe_sect, 0); | |
b4c625c6 SL |
2183 | } |
2184 | if (!sh) { | |
2185 | pr_err("md/raid:%s: Cannot get enough stripes due to memory pressure. Recovery failed.\n", | |
483cbbed | 2186 | mdname(mddev)); |
b4c625c6 SL |
2187 | return -ENOMEM; |
2188 | } | |
2189 | list_add_tail(&sh->lru, cached_stripe_list); | |
2190 | } | |
2191 | ||
1ad45a9b | 2192 | if (le16_to_cpu(payload->header.type) == R5LOG_PAYLOAD_DATA) { |
f7b7bee7 ZL |
2193 | if (!test_bit(STRIPE_R5C_CACHING, &sh->state) && |
2194 | test_bit(R5_Wantwrite, &sh->dev[sh->pd_idx].flags)) { | |
b4c625c6 | 2195 | r5l_recovery_replay_one_stripe(conf, sh, ctx); |
b4c625c6 SL |
2196 | list_move_tail(&sh->lru, cached_stripe_list); |
2197 | } | |
2198 | r5l_recovery_load_data(log, sh, ctx, payload, | |
2199 | log_offset); | |
1ad45a9b | 2200 | } else if (le16_to_cpu(payload->header.type) == R5LOG_PAYLOAD_PARITY) |
b4c625c6 SL |
2201 | r5l_recovery_load_parity(log, sh, ctx, payload, |
2202 | log_offset); | |
2203 | else | |
355810d1 | 2204 | return -EINVAL; |
b4c625c6 SL |
2205 | |
2206 | log_offset = r5l_ring_add(log, log_offset, | |
2207 | le32_to_cpu(payload->size)); | |
2208 | ||
2209 | mb_offset += sizeof(struct r5l_payload_data_parity) + | |
2210 | sizeof(__le32) * | |
2211 | (le32_to_cpu(payload->size) >> (PAGE_SHIFT - 9)); | |
355810d1 | 2212 | } |
b4c625c6 | 2213 | |
355810d1 SL |
2214 | return 0; |
2215 | } | |
2216 | ||
b4c625c6 SL |
2217 | /* |
2218 | * Load the stripe into cache. The stripe will be written out later by | |
2219 | * the stripe cache state machine. | |
2220 | */ | |
2221 | static void r5c_recovery_load_one_stripe(struct r5l_log *log, | |
2222 | struct stripe_head *sh) | |
355810d1 | 2223 | { |
b4c625c6 SL |
2224 | struct r5dev *dev; |
2225 | int i; | |
2226 | ||
2227 | for (i = sh->disks; i--; ) { | |
2228 | dev = sh->dev + i; | |
2229 | if (test_and_clear_bit(R5_Wantwrite, &dev->flags)) { | |
2230 | set_bit(R5_InJournal, &dev->flags); | |
2231 | set_bit(R5_UPTODATE, &dev->flags); | |
2232 | } | |
2233 | } | |
b4c625c6 SL |
2234 | } |
2235 | ||
2236 | /* | |
2237 | * Scan through the log for all to-be-flushed data | |
2238 | * | |
2239 | * For stripes with data and parity, namely Data-Parity stripe | |
2240 | * (STRIPE_R5C_CACHING == 0), we simply replay all the writes. | |
2241 | * | |
2242 | * For stripes with only data, namely Data-Only stripe | |
2243 | * (STRIPE_R5C_CACHING == 1), we load them to stripe cache state machine. | |
2244 | * | |
2245 | * For a stripe, if we see data after parity, we should discard all previous | |
2246 | * data and parity for this stripe, as these data are already flushed to | |
2247 | * the array. | |
2248 | * | |
2249 | * At the end of the scan, we return the new journal_tail, which points to | |
2250 | * first data-only stripe on the journal device, or next invalid meta block. | |
2251 | */ | |
2252 | static int r5c_recovery_flush_log(struct r5l_log *log, | |
2253 | struct r5l_recovery_ctx *ctx) | |
2254 | { | |
bc8f167f | 2255 | struct stripe_head *sh; |
b4c625c6 SL |
2256 | int ret = 0; |
2257 | ||
2258 | /* scan through the log */ | |
355810d1 | 2259 | while (1) { |
b4c625c6 SL |
2260 | if (r5l_recovery_read_meta_block(log, ctx)) |
2261 | break; | |
2262 | ||
2263 | ret = r5c_recovery_analyze_meta_block(log, ctx, | |
2264 | &ctx->cached_list); | |
2265 | /* | |
2266 | * -EAGAIN means mismatch in data block, in this case, we still | |
2267 | * try scan the next metablock | |
2268 | */ | |
2269 | if (ret && ret != -EAGAIN) | |
2270 | break; /* ret == -EINVAL or -ENOMEM */ | |
355810d1 SL |
2271 | ctx->seq++; |
2272 | ctx->pos = r5l_ring_add(log, ctx->pos, ctx->meta_total_blocks); | |
2273 | } | |
b4c625c6 SL |
2274 | |
2275 | if (ret == -ENOMEM) { | |
2276 | r5c_recovery_drop_stripes(&ctx->cached_list, ctx); | |
2277 | return ret; | |
2278 | } | |
2279 | ||
2280 | /* replay data-parity stripes */ | |
2281 | r5c_recovery_replay_stripes(&ctx->cached_list, ctx); | |
2282 | ||
2283 | /* load data-only stripes to stripe cache */ | |
bc8f167f | 2284 | list_for_each_entry(sh, &ctx->cached_list, lru) { |
b4c625c6 SL |
2285 | WARN_ON(!test_bit(STRIPE_R5C_CACHING, &sh->state)); |
2286 | r5c_recovery_load_one_stripe(log, sh); | |
b4c625c6 SL |
2287 | ctx->data_only_stripes++; |
2288 | } | |
2289 | ||
2290 | return 0; | |
355810d1 SL |
2291 | } |
2292 | ||
b4c625c6 SL |
2293 | /* |
2294 | * we did a recovery. Now ctx.pos points to an invalid meta block. New | |
2295 | * log will start here. but we can't let superblock point to last valid | |
2296 | * meta block. The log might looks like: | |
2297 | * | meta 1| meta 2| meta 3| | |
2298 | * meta 1 is valid, meta 2 is invalid. meta 3 could be valid. If | |
2299 | * superblock points to meta 1, we write a new valid meta 2n. if crash | |
2300 | * happens again, new recovery will start from meta 1. Since meta 2n is | |
2301 | * valid now, recovery will think meta 3 is valid, which is wrong. | |
2302 | * The solution is we create a new meta in meta2 with its seq == meta | |
3c6edc66 SL |
2303 | * 1's seq + 10000 and let superblock points to meta2. The same recovery |
2304 | * will not think meta 3 is a valid meta, because its seq doesn't match | |
b4c625c6 SL |
2305 | */ |
2306 | ||
2307 | /* | |
2308 | * Before recovery, the log looks like the following | |
2309 | * | |
2310 | * --------------------------------------------- | |
2311 | * | valid log | invalid log | | |
2312 | * --------------------------------------------- | |
2313 | * ^ | |
2314 | * |- log->last_checkpoint | |
2315 | * |- log->last_cp_seq | |
2316 | * | |
2317 | * Now we scan through the log until we see invalid entry | |
2318 | * | |
2319 | * --------------------------------------------- | |
2320 | * | valid log | invalid log | | |
2321 | * --------------------------------------------- | |
2322 | * ^ ^ | |
2323 | * |- log->last_checkpoint |- ctx->pos | |
2324 | * |- log->last_cp_seq |- ctx->seq | |
2325 | * | |
2326 | * From this point, we need to increase seq number by 10 to avoid | |
2327 | * confusing next recovery. | |
2328 | * | |
2329 | * --------------------------------------------- | |
2330 | * | valid log | invalid log | | |
2331 | * --------------------------------------------- | |
2332 | * ^ ^ | |
2333 | * |- log->last_checkpoint |- ctx->pos+1 | |
3c6edc66 | 2334 | * |- log->last_cp_seq |- ctx->seq+10001 |
b4c625c6 SL |
2335 | * |
2336 | * However, it is not safe to start the state machine yet, because data only | |
2337 | * parities are not yet secured in RAID. To save these data only parities, we | |
2338 | * rewrite them from seq+11. | |
2339 | * | |
2340 | * ----------------------------------------------------------------- | |
2341 | * | valid log | data only stripes | invalid log | | |
2342 | * ----------------------------------------------------------------- | |
2343 | * ^ ^ | |
2344 | * |- log->last_checkpoint |- ctx->pos+n | |
3c6edc66 | 2345 | * |- log->last_cp_seq |- ctx->seq+10000+n |
b4c625c6 SL |
2346 | * |
2347 | * If failure happens again during this process, the recovery can safe start | |
2348 | * again from log->last_checkpoint. | |
2349 | * | |
2350 | * Once data only stripes are rewritten to journal, we move log_tail | |
2351 | * | |
2352 | * ----------------------------------------------------------------- | |
2353 | * | old log | data only stripes | invalid log | | |
2354 | * ----------------------------------------------------------------- | |
2355 | * ^ ^ | |
2356 | * |- log->last_checkpoint |- ctx->pos+n | |
3c6edc66 | 2357 | * |- log->last_cp_seq |- ctx->seq+10000+n |
b4c625c6 SL |
2358 | * |
2359 | * Then we can safely start the state machine. If failure happens from this | |
2360 | * point on, the recovery will start from new log->last_checkpoint. | |
2361 | */ | |
2362 | static int | |
2363 | r5c_recovery_rewrite_data_only_stripes(struct r5l_log *log, | |
2364 | struct r5l_recovery_ctx *ctx) | |
355810d1 | 2365 | { |
a85dd7b8 | 2366 | struct stripe_head *sh; |
b4c625c6 | 2367 | struct mddev *mddev = log->rdev->mddev; |
355810d1 | 2368 | struct page *page; |
3c66abba | 2369 | sector_t next_checkpoint = MaxSector; |
355810d1 | 2370 | |
b4c625c6 SL |
2371 | page = alloc_page(GFP_KERNEL); |
2372 | if (!page) { | |
2373 | pr_err("md/raid:%s: cannot allocate memory to rewrite data only stripes\n", | |
2374 | mdname(mddev)); | |
355810d1 | 2375 | return -ENOMEM; |
b4c625c6 | 2376 | } |
355810d1 | 2377 | |
3c66abba SL |
2378 | WARN_ON(list_empty(&ctx->cached_list)); |
2379 | ||
a85dd7b8 | 2380 | list_for_each_entry(sh, &ctx->cached_list, lru) { |
b4c625c6 SL |
2381 | struct r5l_meta_block *mb; |
2382 | int i; | |
2383 | int offset; | |
2384 | sector_t write_pos; | |
2385 | ||
2386 | WARN_ON(!test_bit(STRIPE_R5C_CACHING, &sh->state)); | |
2387 | r5l_recovery_create_empty_meta_block(log, page, | |
2388 | ctx->pos, ctx->seq); | |
2389 | mb = page_address(page); | |
2390 | offset = le32_to_cpu(mb->meta_size); | |
fc833c2a | 2391 | write_pos = r5l_ring_add(log, ctx->pos, BLOCK_SECTORS); |
b4c625c6 SL |
2392 | |
2393 | for (i = sh->disks; i--; ) { | |
2394 | struct r5dev *dev = &sh->dev[i]; | |
2395 | struct r5l_payload_data_parity *payload; | |
2396 | void *addr; | |
2397 | ||
2398 | if (test_bit(R5_InJournal, &dev->flags)) { | |
2399 | payload = (void *)mb + offset; | |
2400 | payload->header.type = cpu_to_le16( | |
2401 | R5LOG_PAYLOAD_DATA); | |
1ad45a9b | 2402 | payload->size = cpu_to_le32(BLOCK_SECTORS); |
b4c625c6 SL |
2403 | payload->location = cpu_to_le64( |
2404 | raid5_compute_blocknr(sh, i, 0)); | |
2405 | addr = kmap_atomic(dev->page); | |
2406 | payload->checksum[0] = cpu_to_le32( | |
2407 | crc32c_le(log->uuid_checksum, addr, | |
2408 | PAGE_SIZE)); | |
2409 | kunmap_atomic(addr); | |
2410 | sync_page_io(log->rdev, write_pos, PAGE_SIZE, | |
2411 | dev->page, REQ_OP_WRITE, 0, false); | |
2412 | write_pos = r5l_ring_add(log, write_pos, | |
2413 | BLOCK_SECTORS); | |
2414 | offset += sizeof(__le32) + | |
2415 | sizeof(struct r5l_payload_data_parity); | |
2416 | ||
2417 | } | |
2418 | } | |
2419 | mb->meta_size = cpu_to_le32(offset); | |
5c88f403 SL |
2420 | mb->checksum = cpu_to_le32(crc32c_le(log->uuid_checksum, |
2421 | mb, PAGE_SIZE)); | |
b4c625c6 | 2422 | sync_page_io(log->rdev, ctx->pos, PAGE_SIZE, page, |
5a8948f8 | 2423 | REQ_OP_WRITE, REQ_SYNC | REQ_FUA, false); |
b4c625c6 | 2424 | sh->log_start = ctx->pos; |
3c66abba SL |
2425 | list_add_tail(&sh->r5c, &log->stripe_in_journal_list); |
2426 | atomic_inc(&log->stripe_in_journal_count); | |
b4c625c6 SL |
2427 | ctx->pos = write_pos; |
2428 | ctx->seq += 1; | |
3c66abba | 2429 | next_checkpoint = sh->log_start; |
355810d1 | 2430 | } |
3c66abba | 2431 | log->next_checkpoint = next_checkpoint; |
355810d1 SL |
2432 | __free_page(page); |
2433 | return 0; | |
2434 | } | |
2435 | ||
a85dd7b8 SL |
2436 | static void r5c_recovery_flush_data_only_stripes(struct r5l_log *log, |
2437 | struct r5l_recovery_ctx *ctx) | |
2438 | { | |
2439 | struct mddev *mddev = log->rdev->mddev; | |
2440 | struct r5conf *conf = mddev->private; | |
2441 | struct stripe_head *sh, *next; | |
2442 | ||
2443 | if (ctx->data_only_stripes == 0) | |
2444 | return; | |
2445 | ||
2446 | log->r5c_journal_mode = R5C_JOURNAL_MODE_WRITE_BACK; | |
2447 | ||
2448 | list_for_each_entry_safe(sh, next, &ctx->cached_list, lru) { | |
2449 | r5c_make_stripe_write_out(sh); | |
2450 | set_bit(STRIPE_HANDLE, &sh->state); | |
2451 | list_del_init(&sh->lru); | |
2452 | raid5_release_stripe(sh); | |
2453 | } | |
2454 | ||
a85dd7b8 SL |
2455 | /* reuse conf->wait_for_quiescent in recovery */ |
2456 | wait_event(conf->wait_for_quiescent, | |
2457 | atomic_read(&conf->active_stripes) == 0); | |
2458 | ||
2459 | log->r5c_journal_mode = R5C_JOURNAL_MODE_WRITE_THROUGH; | |
2460 | } | |
2461 | ||
f6bed0ef SL |
2462 | static int r5l_recovery_log(struct r5l_log *log) |
2463 | { | |
5aabf7c4 | 2464 | struct mddev *mddev = log->rdev->mddev; |
effe6ee7 | 2465 | struct r5l_recovery_ctx *ctx; |
5aabf7c4 | 2466 | int ret; |
43b96748 | 2467 | sector_t pos; |
355810d1 | 2468 | |
effe6ee7 SL |
2469 | ctx = kzalloc(sizeof(*ctx), GFP_KERNEL); |
2470 | if (!ctx) | |
355810d1 SL |
2471 | return -ENOMEM; |
2472 | ||
effe6ee7 SL |
2473 | ctx->pos = log->last_checkpoint; |
2474 | ctx->seq = log->last_cp_seq; | |
2475 | INIT_LIST_HEAD(&ctx->cached_list); | |
2476 | ctx->meta_page = alloc_page(GFP_KERNEL); | |
355810d1 | 2477 | |
effe6ee7 SL |
2478 | if (!ctx->meta_page) { |
2479 | ret = -ENOMEM; | |
2480 | goto meta_page; | |
2481 | } | |
b4c625c6 | 2482 | |
effe6ee7 SL |
2483 | if (r5l_recovery_allocate_ra_pool(log, ctx) != 0) { |
2484 | ret = -ENOMEM; | |
2485 | goto ra_pool; | |
2486 | } | |
2487 | ||
2488 | ret = r5c_recovery_flush_log(log, ctx); | |
2489 | ||
2490 | if (ret) | |
2491 | goto error; | |
43b96748 | 2492 | |
effe6ee7 SL |
2493 | pos = ctx->pos; |
2494 | ctx->seq += 10000; | |
43b96748 | 2495 | |
effe6ee7 | 2496 | if ((ctx->data_only_stripes == 0) && (ctx->data_parity_stripes == 0)) |
92e6245d | 2497 | pr_info("md/raid:%s: starting from clean shutdown\n", |
5aabf7c4 | 2498 | mdname(mddev)); |
a85dd7b8 | 2499 | else |
92e6245d | 2500 | pr_info("md/raid:%s: recovering %d data-only stripes and %d data-parity stripes\n", |
effe6ee7 SL |
2501 | mdname(mddev), ctx->data_only_stripes, |
2502 | ctx->data_parity_stripes); | |
2503 | ||
2504 | if (ctx->data_only_stripes == 0) { | |
2505 | log->next_checkpoint = ctx->pos; | |
2506 | r5l_log_write_empty_meta_block(log, ctx->pos, ctx->seq++); | |
2507 | ctx->pos = r5l_ring_add(log, ctx->pos, BLOCK_SECTORS); | |
2508 | } else if (r5c_recovery_rewrite_data_only_stripes(log, ctx)) { | |
a85dd7b8 SL |
2509 | pr_err("md/raid:%s: failed to rewrite stripes to journal\n", |
2510 | mdname(mddev)); | |
effe6ee7 SL |
2511 | ret = -EIO; |
2512 | goto error; | |
b4c625c6 SL |
2513 | } |
2514 | ||
effe6ee7 SL |
2515 | log->log_start = ctx->pos; |
2516 | log->seq = ctx->seq; | |
43b96748 J |
2517 | log->last_checkpoint = pos; |
2518 | r5l_write_super(log, pos); | |
a85dd7b8 | 2519 | |
effe6ee7 SL |
2520 | r5c_recovery_flush_data_only_stripes(log, ctx); |
2521 | ret = 0; | |
2522 | error: | |
2523 | r5l_recovery_free_ra_pool(log, ctx); | |
2524 | ra_pool: | |
2525 | __free_page(ctx->meta_page); | |
2526 | meta_page: | |
2527 | kfree(ctx); | |
2528 | return ret; | |
f6bed0ef SL |
2529 | } |
2530 | ||
2531 | static void r5l_write_super(struct r5l_log *log, sector_t cp) | |
2532 | { | |
2533 | struct mddev *mddev = log->rdev->mddev; | |
2534 | ||
2535 | log->rdev->journal_tail = cp; | |
2953079c | 2536 | set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags); |
f6bed0ef SL |
2537 | } |
2538 | ||
2c7da14b SL |
2539 | static ssize_t r5c_journal_mode_show(struct mddev *mddev, char *page) |
2540 | { | |
a72cbf83 | 2541 | struct r5conf *conf; |
2c7da14b SL |
2542 | int ret; |
2543 | ||
a72cbf83 SL |
2544 | ret = mddev_lock(mddev); |
2545 | if (ret) | |
2546 | return ret; | |
2547 | ||
2548 | conf = mddev->private; | |
2549 | if (!conf || !conf->log) { | |
2550 | mddev_unlock(mddev); | |
2c7da14b | 2551 | return 0; |
a72cbf83 | 2552 | } |
2c7da14b SL |
2553 | |
2554 | switch (conf->log->r5c_journal_mode) { | |
2555 | case R5C_JOURNAL_MODE_WRITE_THROUGH: | |
2556 | ret = snprintf( | |
2557 | page, PAGE_SIZE, "[%s] %s\n", | |
2558 | r5c_journal_mode_str[R5C_JOURNAL_MODE_WRITE_THROUGH], | |
2559 | r5c_journal_mode_str[R5C_JOURNAL_MODE_WRITE_BACK]); | |
2560 | break; | |
2561 | case R5C_JOURNAL_MODE_WRITE_BACK: | |
2562 | ret = snprintf( | |
2563 | page, PAGE_SIZE, "%s [%s]\n", | |
2564 | r5c_journal_mode_str[R5C_JOURNAL_MODE_WRITE_THROUGH], | |
2565 | r5c_journal_mode_str[R5C_JOURNAL_MODE_WRITE_BACK]); | |
2566 | break; | |
2567 | default: | |
2568 | ret = 0; | |
2569 | } | |
a72cbf83 | 2570 | mddev_unlock(mddev); |
2c7da14b SL |
2571 | return ret; |
2572 | } | |
2573 | ||
78e470c2 HM |
2574 | /* |
2575 | * Set journal cache mode on @mddev (external API initially needed by dm-raid). | |
2576 | * | |
2577 | * @mode as defined in 'enum r5c_journal_mode'. | |
2578 | * | |
2579 | */ | |
2580 | int r5c_journal_mode_set(struct mddev *mddev, int mode) | |
2c7da14b | 2581 | { |
b44886c5 | 2582 | struct r5conf *conf; |
2c7da14b | 2583 | |
78e470c2 HM |
2584 | if (mode < R5C_JOURNAL_MODE_WRITE_THROUGH || |
2585 | mode > R5C_JOURNAL_MODE_WRITE_BACK) | |
2c7da14b SL |
2586 | return -EINVAL; |
2587 | ||
b44886c5 | 2588 | conf = mddev->private; |
ff35f58e | 2589 | if (!conf || !conf->log) |
b44886c5 | 2590 | return -ENODEV; |
b44886c5 | 2591 | |
2e38a37f | 2592 | if (raid5_calc_degraded(conf) > 0 && |
ff35f58e | 2593 | mode == R5C_JOURNAL_MODE_WRITE_BACK) |
2e38a37f SL |
2594 | return -EINVAL; |
2595 | ||
2c7da14b | 2596 | mddev_suspend(mddev); |
78e470c2 | 2597 | conf->log->r5c_journal_mode = mode; |
2c7da14b SL |
2598 | mddev_resume(mddev); |
2599 | ||
2600 | pr_debug("md/raid:%s: setting r5c cache mode to %d: %s\n", | |
78e470c2 HM |
2601 | mdname(mddev), mode, r5c_journal_mode_str[mode]); |
2602 | return 0; | |
2603 | } | |
2604 | EXPORT_SYMBOL(r5c_journal_mode_set); | |
2605 | ||
2606 | static ssize_t r5c_journal_mode_store(struct mddev *mddev, | |
2607 | const char *page, size_t length) | |
2608 | { | |
2609 | int mode = ARRAY_SIZE(r5c_journal_mode_str); | |
2610 | size_t len = length; | |
ff35f58e | 2611 | int ret; |
78e470c2 HM |
2612 | |
2613 | if (len < 2) | |
2614 | return -EINVAL; | |
2615 | ||
2616 | if (page[len - 1] == '\n') | |
2617 | len--; | |
2618 | ||
2619 | while (mode--) | |
2620 | if (strlen(r5c_journal_mode_str[mode]) == len && | |
2621 | !strncmp(page, r5c_journal_mode_str[mode], len)) | |
2622 | break; | |
ff35f58e SL |
2623 | ret = mddev_lock(mddev); |
2624 | if (ret) | |
2625 | return ret; | |
2626 | ret = r5c_journal_mode_set(mddev, mode); | |
2627 | mddev_unlock(mddev); | |
2628 | return ret ?: length; | |
2c7da14b SL |
2629 | } |
2630 | ||
2631 | struct md_sysfs_entry | |
2632 | r5c_journal_mode = __ATTR(journal_mode, 0644, | |
2633 | r5c_journal_mode_show, r5c_journal_mode_store); | |
2634 | ||
2ded3703 SL |
2635 | /* |
2636 | * Try handle write operation in caching phase. This function should only | |
2637 | * be called in write-back mode. | |
2638 | * | |
2639 | * If all outstanding writes can be handled in caching phase, returns 0 | |
2640 | * If writes requires write-out phase, call r5c_make_stripe_write_out() | |
2641 | * and returns -EAGAIN | |
2642 | */ | |
2643 | int r5c_try_caching_write(struct r5conf *conf, | |
2644 | struct stripe_head *sh, | |
2645 | struct stripe_head_state *s, | |
2646 | int disks) | |
2647 | { | |
2648 | struct r5l_log *log = conf->log; | |
1e6d690b SL |
2649 | int i; |
2650 | struct r5dev *dev; | |
2651 | int to_cache = 0; | |
03b047f4 SL |
2652 | void **pslot; |
2653 | sector_t tree_index; | |
2654 | int ret; | |
2655 | uintptr_t refcount; | |
2ded3703 SL |
2656 | |
2657 | BUG_ON(!r5c_is_writeback(log)); | |
2658 | ||
1e6d690b SL |
2659 | if (!test_bit(STRIPE_R5C_CACHING, &sh->state)) { |
2660 | /* | |
2661 | * There are two different scenarios here: | |
2662 | * 1. The stripe has some data cached, and it is sent to | |
2663 | * write-out phase for reclaim | |
2664 | * 2. The stripe is clean, and this is the first write | |
2665 | * | |
2666 | * For 1, return -EAGAIN, so we continue with | |
2667 | * handle_stripe_dirtying(). | |
2668 | * | |
2669 | * For 2, set STRIPE_R5C_CACHING and continue with caching | |
2670 | * write. | |
2671 | */ | |
2672 | ||
2673 | /* case 1: anything injournal or anything in written */ | |
2674 | if (s->injournal > 0 || s->written > 0) | |
2675 | return -EAGAIN; | |
2676 | /* case 2 */ | |
2677 | set_bit(STRIPE_R5C_CACHING, &sh->state); | |
2678 | } | |
2679 | ||
2e38a37f SL |
2680 | /* |
2681 | * When run in degraded mode, array is set to write-through mode. | |
2682 | * This check helps drain pending write safely in the transition to | |
2683 | * write-through mode. | |
5ddf0440 SL |
2684 | * |
2685 | * When a stripe is syncing, the write is also handled in write | |
2686 | * through mode. | |
2e38a37f | 2687 | */ |
5ddf0440 | 2688 | if (s->failed || test_bit(STRIPE_SYNCING, &sh->state)) { |
2e38a37f SL |
2689 | r5c_make_stripe_write_out(sh); |
2690 | return -EAGAIN; | |
2691 | } | |
2692 | ||
1e6d690b SL |
2693 | for (i = disks; i--; ) { |
2694 | dev = &sh->dev[i]; | |
2695 | /* if non-overwrite, use writing-out phase */ | |
2696 | if (dev->towrite && !test_bit(R5_OVERWRITE, &dev->flags) && | |
2697 | !test_bit(R5_InJournal, &dev->flags)) { | |
2698 | r5c_make_stripe_write_out(sh); | |
2699 | return -EAGAIN; | |
2700 | } | |
2701 | } | |
2702 | ||
03b047f4 SL |
2703 | /* if the stripe is not counted in big_stripe_tree, add it now */ |
2704 | if (!test_bit(STRIPE_R5C_PARTIAL_STRIPE, &sh->state) && | |
2705 | !test_bit(STRIPE_R5C_FULL_STRIPE, &sh->state)) { | |
2706 | tree_index = r5c_tree_index(conf, sh->sector); | |
2707 | spin_lock(&log->tree_lock); | |
2708 | pslot = radix_tree_lookup_slot(&log->big_stripe_tree, | |
2709 | tree_index); | |
2710 | if (pslot) { | |
2711 | refcount = (uintptr_t)radix_tree_deref_slot_protected( | |
2712 | pslot, &log->tree_lock) >> | |
2713 | R5C_RADIX_COUNT_SHIFT; | |
2714 | radix_tree_replace_slot( | |
2715 | &log->big_stripe_tree, pslot, | |
2716 | (void *)((refcount + 1) << R5C_RADIX_COUNT_SHIFT)); | |
2717 | } else { | |
2718 | /* | |
2719 | * this radix_tree_insert can fail safely, so no | |
2720 | * need to call radix_tree_preload() | |
2721 | */ | |
2722 | ret = radix_tree_insert( | |
2723 | &log->big_stripe_tree, tree_index, | |
2724 | (void *)(1 << R5C_RADIX_COUNT_SHIFT)); | |
2725 | if (ret) { | |
2726 | spin_unlock(&log->tree_lock); | |
2727 | r5c_make_stripe_write_out(sh); | |
2728 | return -EAGAIN; | |
2729 | } | |
2730 | } | |
2731 | spin_unlock(&log->tree_lock); | |
2732 | ||
2733 | /* | |
2734 | * set STRIPE_R5C_PARTIAL_STRIPE, this shows the stripe is | |
2735 | * counted in the radix tree | |
2736 | */ | |
2737 | set_bit(STRIPE_R5C_PARTIAL_STRIPE, &sh->state); | |
2738 | atomic_inc(&conf->r5c_cached_partial_stripes); | |
2739 | } | |
2740 | ||
1e6d690b SL |
2741 | for (i = disks; i--; ) { |
2742 | dev = &sh->dev[i]; | |
2743 | if (dev->towrite) { | |
2744 | set_bit(R5_Wantwrite, &dev->flags); | |
2745 | set_bit(R5_Wantdrain, &dev->flags); | |
2746 | set_bit(R5_LOCKED, &dev->flags); | |
2747 | to_cache++; | |
2748 | } | |
2749 | } | |
2750 | ||
2751 | if (to_cache) { | |
2752 | set_bit(STRIPE_OP_BIODRAIN, &s->ops_request); | |
2753 | /* | |
2754 | * set STRIPE_LOG_TRAPPED, which triggers r5c_cache_data() | |
2755 | * in ops_run_io(). STRIPE_LOG_TRAPPED will be cleared in | |
2756 | * r5c_handle_data_cached() | |
2757 | */ | |
2758 | set_bit(STRIPE_LOG_TRAPPED, &sh->state); | |
2759 | } | |
2760 | ||
2761 | return 0; | |
2762 | } | |
2763 | ||
2764 | /* | |
2765 | * free extra pages (orig_page) we allocated for prexor | |
2766 | */ | |
2767 | void r5c_release_extra_page(struct stripe_head *sh) | |
2768 | { | |
d7bd398e | 2769 | struct r5conf *conf = sh->raid_conf; |
1e6d690b | 2770 | int i; |
d7bd398e SL |
2771 | bool using_disk_info_extra_page; |
2772 | ||
2773 | using_disk_info_extra_page = | |
2774 | sh->dev[0].orig_page == conf->disks[0].extra_page; | |
1e6d690b SL |
2775 | |
2776 | for (i = sh->disks; i--; ) | |
2777 | if (sh->dev[i].page != sh->dev[i].orig_page) { | |
2778 | struct page *p = sh->dev[i].orig_page; | |
2779 | ||
2780 | sh->dev[i].orig_page = sh->dev[i].page; | |
86aa1397 SL |
2781 | clear_bit(R5_OrigPageUPTDODATE, &sh->dev[i].flags); |
2782 | ||
d7bd398e SL |
2783 | if (!using_disk_info_extra_page) |
2784 | put_page(p); | |
1e6d690b | 2785 | } |
d7bd398e SL |
2786 | |
2787 | if (using_disk_info_extra_page) { | |
2788 | clear_bit(R5C_EXTRA_PAGE_IN_USE, &conf->cache_state); | |
2789 | md_wakeup_thread(conf->mddev->thread); | |
2790 | } | |
2791 | } | |
2792 | ||
2793 | void r5c_use_extra_page(struct stripe_head *sh) | |
2794 | { | |
2795 | struct r5conf *conf = sh->raid_conf; | |
2796 | int i; | |
2797 | struct r5dev *dev; | |
2798 | ||
2799 | for (i = sh->disks; i--; ) { | |
2800 | dev = &sh->dev[i]; | |
2801 | if (dev->orig_page != dev->page) | |
2802 | put_page(dev->orig_page); | |
2803 | dev->orig_page = conf->disks[i].extra_page; | |
2804 | } | |
2ded3703 SL |
2805 | } |
2806 | ||
2807 | /* | |
2808 | * clean up the stripe (clear R5_InJournal for dev[pd_idx] etc.) after the | |
2809 | * stripe is committed to RAID disks. | |
2810 | */ | |
2811 | void r5c_finish_stripe_write_out(struct r5conf *conf, | |
2812 | struct stripe_head *sh, | |
2813 | struct stripe_head_state *s) | |
2814 | { | |
03b047f4 | 2815 | struct r5l_log *log = conf->log; |
1e6d690b SL |
2816 | int i; |
2817 | int do_wakeup = 0; | |
03b047f4 SL |
2818 | sector_t tree_index; |
2819 | void **pslot; | |
2820 | uintptr_t refcount; | |
1e6d690b | 2821 | |
03b047f4 | 2822 | if (!log || !test_bit(R5_InJournal, &sh->dev[sh->pd_idx].flags)) |
2ded3703 SL |
2823 | return; |
2824 | ||
2825 | WARN_ON(test_bit(STRIPE_R5C_CACHING, &sh->state)); | |
2826 | clear_bit(R5_InJournal, &sh->dev[sh->pd_idx].flags); | |
2827 | ||
03b047f4 | 2828 | if (log->r5c_journal_mode == R5C_JOURNAL_MODE_WRITE_THROUGH) |
2ded3703 | 2829 | return; |
1e6d690b SL |
2830 | |
2831 | for (i = sh->disks; i--; ) { | |
2832 | clear_bit(R5_InJournal, &sh->dev[i].flags); | |
2833 | if (test_and_clear_bit(R5_Overlap, &sh->dev[i].flags)) | |
2834 | do_wakeup = 1; | |
2835 | } | |
2836 | ||
2837 | /* | |
2838 | * analyse_stripe() runs before r5c_finish_stripe_write_out(), | |
2839 | * We updated R5_InJournal, so we also update s->injournal. | |
2840 | */ | |
2841 | s->injournal = 0; | |
2842 | ||
2843 | if (test_and_clear_bit(STRIPE_FULL_WRITE, &sh->state)) | |
2844 | if (atomic_dec_and_test(&conf->pending_full_writes)) | |
2845 | md_wakeup_thread(conf->mddev->thread); | |
2846 | ||
2847 | if (do_wakeup) | |
2848 | wake_up(&conf->wait_for_overlap); | |
a39f7afd | 2849 | |
03b047f4 | 2850 | spin_lock_irq(&log->stripe_in_journal_lock); |
a39f7afd | 2851 | list_del_init(&sh->r5c); |
03b047f4 | 2852 | spin_unlock_irq(&log->stripe_in_journal_lock); |
a39f7afd | 2853 | sh->log_start = MaxSector; |
03b047f4 SL |
2854 | |
2855 | atomic_dec(&log->stripe_in_journal_count); | |
2856 | r5c_update_log_state(log); | |
2857 | ||
2858 | /* stop counting this stripe in big_stripe_tree */ | |
2859 | if (test_bit(STRIPE_R5C_PARTIAL_STRIPE, &sh->state) || | |
2860 | test_bit(STRIPE_R5C_FULL_STRIPE, &sh->state)) { | |
2861 | tree_index = r5c_tree_index(conf, sh->sector); | |
2862 | spin_lock(&log->tree_lock); | |
2863 | pslot = radix_tree_lookup_slot(&log->big_stripe_tree, | |
2864 | tree_index); | |
2865 | BUG_ON(pslot == NULL); | |
2866 | refcount = (uintptr_t)radix_tree_deref_slot_protected( | |
2867 | pslot, &log->tree_lock) >> | |
2868 | R5C_RADIX_COUNT_SHIFT; | |
2869 | if (refcount == 1) | |
2870 | radix_tree_delete(&log->big_stripe_tree, tree_index); | |
2871 | else | |
2872 | radix_tree_replace_slot( | |
2873 | &log->big_stripe_tree, pslot, | |
2874 | (void *)((refcount - 1) << R5C_RADIX_COUNT_SHIFT)); | |
2875 | spin_unlock(&log->tree_lock); | |
2876 | } | |
2877 | ||
2878 | if (test_and_clear_bit(STRIPE_R5C_PARTIAL_STRIPE, &sh->state)) { | |
2879 | BUG_ON(atomic_read(&conf->r5c_cached_partial_stripes) == 0); | |
e33fbb9c | 2880 | atomic_dec(&conf->r5c_flushing_partial_stripes); |
03b047f4 SL |
2881 | atomic_dec(&conf->r5c_cached_partial_stripes); |
2882 | } | |
2883 | ||
2884 | if (test_and_clear_bit(STRIPE_R5C_FULL_STRIPE, &sh->state)) { | |
2885 | BUG_ON(atomic_read(&conf->r5c_cached_full_stripes) == 0); | |
e33fbb9c | 2886 | atomic_dec(&conf->r5c_flushing_full_stripes); |
03b047f4 SL |
2887 | atomic_dec(&conf->r5c_cached_full_stripes); |
2888 | } | |
ea17481f SL |
2889 | |
2890 | r5l_append_flush_payload(log, sh->sector); | |
5ddf0440 SL |
2891 | /* stripe is flused to raid disks, we can do resync now */ |
2892 | if (test_bit(STRIPE_SYNC_REQUESTED, &sh->state)) | |
2893 | set_bit(STRIPE_HANDLE, &sh->state); | |
1e6d690b SL |
2894 | } |
2895 | ||
ff875738 | 2896 | int r5c_cache_data(struct r5l_log *log, struct stripe_head *sh) |
1e6d690b | 2897 | { |
a39f7afd | 2898 | struct r5conf *conf = sh->raid_conf; |
1e6d690b SL |
2899 | int pages = 0; |
2900 | int reserve; | |
2901 | int i; | |
2902 | int ret = 0; | |
2903 | ||
2904 | BUG_ON(!log); | |
2905 | ||
2906 | for (i = 0; i < sh->disks; i++) { | |
2907 | void *addr; | |
2908 | ||
2909 | if (!test_bit(R5_Wantwrite, &sh->dev[i].flags)) | |
2910 | continue; | |
2911 | addr = kmap_atomic(sh->dev[i].page); | |
2912 | sh->dev[i].log_checksum = crc32c_le(log->uuid_checksum, | |
2913 | addr, PAGE_SIZE); | |
2914 | kunmap_atomic(addr); | |
2915 | pages++; | |
2916 | } | |
2917 | WARN_ON(pages == 0); | |
2918 | ||
2919 | /* | |
2920 | * The stripe must enter state machine again to call endio, so | |
2921 | * don't delay. | |
2922 | */ | |
2923 | clear_bit(STRIPE_DELAYED, &sh->state); | |
2924 | atomic_inc(&sh->count); | |
2925 | ||
2926 | mutex_lock(&log->io_mutex); | |
2927 | /* meta + data */ | |
2928 | reserve = (1 + pages) << (PAGE_SHIFT - 9); | |
1e6d690b | 2929 | |
a39f7afd SL |
2930 | if (test_bit(R5C_LOG_CRITICAL, &conf->cache_state) && |
2931 | sh->log_start == MaxSector) | |
2932 | r5l_add_no_space_stripe(log, sh); | |
2933 | else if (!r5l_has_free_space(log, reserve)) { | |
2934 | if (sh->log_start == log->last_checkpoint) | |
2935 | BUG(); | |
2936 | else | |
2937 | r5l_add_no_space_stripe(log, sh); | |
1e6d690b SL |
2938 | } else { |
2939 | ret = r5l_log_stripe(log, sh, pages, 0); | |
2940 | if (ret) { | |
2941 | spin_lock_irq(&log->io_list_lock); | |
2942 | list_add_tail(&sh->log_list, &log->no_mem_stripes); | |
2943 | spin_unlock_irq(&log->io_list_lock); | |
2944 | } | |
2945 | } | |
2946 | ||
2947 | mutex_unlock(&log->io_mutex); | |
2948 | return 0; | |
f6bed0ef SL |
2949 | } |
2950 | ||
03b047f4 SL |
2951 | /* check whether this big stripe is in write back cache. */ |
2952 | bool r5c_big_stripe_cached(struct r5conf *conf, sector_t sect) | |
2953 | { | |
2954 | struct r5l_log *log = conf->log; | |
2955 | sector_t tree_index; | |
2956 | void *slot; | |
2957 | ||
2958 | if (!log) | |
2959 | return false; | |
2960 | ||
2961 | WARN_ON_ONCE(!rcu_read_lock_held()); | |
2962 | tree_index = r5c_tree_index(conf, sect); | |
2963 | slot = radix_tree_lookup(&log->big_stripe_tree, tree_index); | |
2964 | return slot != NULL; | |
2965 | } | |
2966 | ||
f6bed0ef SL |
2967 | static int r5l_load_log(struct r5l_log *log) |
2968 | { | |
2969 | struct md_rdev *rdev = log->rdev; | |
2970 | struct page *page; | |
2971 | struct r5l_meta_block *mb; | |
2972 | sector_t cp = log->rdev->journal_tail; | |
2973 | u32 stored_crc, expected_crc; | |
2974 | bool create_super = false; | |
d30dfeb9 | 2975 | int ret = 0; |
f6bed0ef SL |
2976 | |
2977 | /* Make sure it's valid */ | |
2978 | if (cp >= rdev->sectors || round_down(cp, BLOCK_SECTORS) != cp) | |
2979 | cp = 0; | |
2980 | page = alloc_page(GFP_KERNEL); | |
2981 | if (!page) | |
2982 | return -ENOMEM; | |
2983 | ||
796a5cf0 | 2984 | if (!sync_page_io(rdev, cp, PAGE_SIZE, page, REQ_OP_READ, 0, false)) { |
f6bed0ef SL |
2985 | ret = -EIO; |
2986 | goto ioerr; | |
2987 | } | |
2988 | mb = page_address(page); | |
2989 | ||
2990 | if (le32_to_cpu(mb->magic) != R5LOG_MAGIC || | |
2991 | mb->version != R5LOG_VERSION) { | |
2992 | create_super = true; | |
2993 | goto create; | |
2994 | } | |
2995 | stored_crc = le32_to_cpu(mb->checksum); | |
2996 | mb->checksum = 0; | |
5cb2fbd6 | 2997 | expected_crc = crc32c_le(log->uuid_checksum, mb, PAGE_SIZE); |
f6bed0ef SL |
2998 | if (stored_crc != expected_crc) { |
2999 | create_super = true; | |
3000 | goto create; | |
3001 | } | |
3002 | if (le64_to_cpu(mb->position) != cp) { | |
3003 | create_super = true; | |
3004 | goto create; | |
3005 | } | |
3006 | create: | |
3007 | if (create_super) { | |
3008 | log->last_cp_seq = prandom_u32(); | |
3009 | cp = 0; | |
56056c2e | 3010 | r5l_log_write_empty_meta_block(log, cp, log->last_cp_seq); |
f6bed0ef SL |
3011 | /* |
3012 | * Make sure super points to correct address. Log might have | |
3013 | * data very soon. If super hasn't correct log tail address, | |
3014 | * recovery can't find the log | |
3015 | */ | |
3016 | r5l_write_super(log, cp); | |
3017 | } else | |
3018 | log->last_cp_seq = le64_to_cpu(mb->seq); | |
3019 | ||
3020 | log->device_size = round_down(rdev->sectors, BLOCK_SECTORS); | |
0576b1c6 SL |
3021 | log->max_free_space = log->device_size >> RECLAIM_MAX_FREE_SPACE_SHIFT; |
3022 | if (log->max_free_space > RECLAIM_MAX_FREE_SPACE) | |
3023 | log->max_free_space = RECLAIM_MAX_FREE_SPACE; | |
f6bed0ef SL |
3024 | log->last_checkpoint = cp; |
3025 | ||
3026 | __free_page(page); | |
3027 | ||
d30dfeb9 J |
3028 | if (create_super) { |
3029 | log->log_start = r5l_ring_add(log, cp, BLOCK_SECTORS); | |
3030 | log->seq = log->last_cp_seq + 1; | |
3031 | log->next_checkpoint = cp; | |
3032 | } else | |
3033 | ret = r5l_recovery_log(log); | |
3034 | ||
3d7e7e1d ZL |
3035 | r5c_update_log_state(log); |
3036 | return ret; | |
f6bed0ef SL |
3037 | ioerr: |
3038 | __free_page(page); | |
3039 | return ret; | |
3040 | } | |
3041 | ||
d5d885fd SL |
3042 | int r5l_start(struct r5l_log *log) |
3043 | { | |
3044 | int ret; | |
3045 | ||
3046 | if (!log) | |
3047 | return 0; | |
3048 | ||
3049 | ret = r5l_load_log(log); | |
3050 | if (ret) { | |
3051 | struct mddev *mddev = log->rdev->mddev; | |
3052 | struct r5conf *conf = mddev->private; | |
3053 | ||
3054 | r5l_exit_log(conf); | |
3055 | } | |
3056 | return ret; | |
3057 | } | |
3058 | ||
70d466f7 | 3059 | void r5c_update_on_rdev_error(struct mddev *mddev, struct md_rdev *rdev) |
2e38a37f SL |
3060 | { |
3061 | struct r5conf *conf = mddev->private; | |
3062 | struct r5l_log *log = conf->log; | |
3063 | ||
3064 | if (!log) | |
3065 | return; | |
3066 | ||
70d466f7 SL |
3067 | if ((raid5_calc_degraded(conf) > 0 || |
3068 | test_bit(Journal, &rdev->flags)) && | |
2e38a37f SL |
3069 | conf->log->r5c_journal_mode == R5C_JOURNAL_MODE_WRITE_BACK) |
3070 | schedule_work(&log->disable_writeback_work); | |
3071 | } | |
3072 | ||
f6bed0ef SL |
3073 | int r5l_init_log(struct r5conf *conf, struct md_rdev *rdev) |
3074 | { | |
c888a8f9 | 3075 | struct request_queue *q = bdev_get_queue(rdev->bdev); |
f6bed0ef | 3076 | struct r5l_log *log; |
ff875738 | 3077 | char b[BDEVNAME_SIZE]; |
afeee514 | 3078 | int ret; |
ff875738 AP |
3079 | |
3080 | pr_debug("md/raid:%s: using device %s as journal\n", | |
3081 | mdname(conf->mddev), bdevname(rdev->bdev, b)); | |
f6bed0ef SL |
3082 | |
3083 | if (PAGE_SIZE != 4096) | |
3084 | return -EINVAL; | |
c757ec95 SL |
3085 | |
3086 | /* | |
3087 | * The PAGE_SIZE must be big enough to hold 1 r5l_meta_block and | |
3088 | * raid_disks r5l_payload_data_parity. | |
3089 | * | |
3090 | * Write journal and cache does not work for very big array | |
3091 | * (raid_disks > 203) | |
3092 | */ | |
3093 | if (sizeof(struct r5l_meta_block) + | |
3094 | ((sizeof(struct r5l_payload_data_parity) + sizeof(__le32)) * | |
3095 | conf->raid_disks) > PAGE_SIZE) { | |
3096 | pr_err("md/raid:%s: write journal/cache doesn't work for array with %d disks\n", | |
3097 | mdname(conf->mddev), conf->raid_disks); | |
3098 | return -EINVAL; | |
3099 | } | |
3100 | ||
f6bed0ef SL |
3101 | log = kzalloc(sizeof(*log), GFP_KERNEL); |
3102 | if (!log) | |
3103 | return -ENOMEM; | |
3104 | log->rdev = rdev; | |
3105 | ||
c888a8f9 | 3106 | log->need_cache_flush = test_bit(QUEUE_FLAG_WC, &q->queue_flags) != 0; |
56fef7c6 | 3107 | |
5cb2fbd6 SL |
3108 | log->uuid_checksum = crc32c_le(~0, rdev->mddev->uuid, |
3109 | sizeof(rdev->mddev->uuid)); | |
f6bed0ef SL |
3110 | |
3111 | mutex_init(&log->io_mutex); | |
3112 | ||
3113 | spin_lock_init(&log->io_list_lock); | |
3114 | INIT_LIST_HEAD(&log->running_ios); | |
0576b1c6 | 3115 | INIT_LIST_HEAD(&log->io_end_ios); |
a8c34f91 | 3116 | INIT_LIST_HEAD(&log->flushing_ios); |
04732f74 | 3117 | INIT_LIST_HEAD(&log->finished_ios); |
3a83f467 | 3118 | bio_init(&log->flush_bio, NULL, 0); |
f6bed0ef SL |
3119 | |
3120 | log->io_kc = KMEM_CACHE(r5l_io_unit, 0); | |
3121 | if (!log->io_kc) | |
3122 | goto io_kc; | |
3123 | ||
afeee514 KO |
3124 | ret = mempool_init_slab_pool(&log->io_pool, R5L_POOL_SIZE, log->io_kc); |
3125 | if (ret) | |
5036c390 CH |
3126 | goto io_pool; |
3127 | ||
afeee514 KO |
3128 | ret = bioset_init(&log->bs, R5L_POOL_SIZE, 0, BIOSET_NEED_BVECS); |
3129 | if (ret) | |
c38d29b3 CH |
3130 | goto io_bs; |
3131 | ||
afeee514 KO |
3132 | ret = mempool_init_page_pool(&log->meta_pool, R5L_POOL_SIZE, 0); |
3133 | if (ret) | |
e8deb638 CH |
3134 | goto out_mempool; |
3135 | ||
03b047f4 SL |
3136 | spin_lock_init(&log->tree_lock); |
3137 | INIT_RADIX_TREE(&log->big_stripe_tree, GFP_NOWAIT | __GFP_NOWARN); | |
3138 | ||
0576b1c6 SL |
3139 | log->reclaim_thread = md_register_thread(r5l_reclaim_thread, |
3140 | log->rdev->mddev, "reclaim"); | |
3141 | if (!log->reclaim_thread) | |
3142 | goto reclaim_thread; | |
a39f7afd SL |
3143 | log->reclaim_thread->timeout = R5C_RECLAIM_WAKEUP_INTERVAL; |
3144 | ||
0fd22b45 | 3145 | init_waitqueue_head(&log->iounit_wait); |
0576b1c6 | 3146 | |
5036c390 CH |
3147 | INIT_LIST_HEAD(&log->no_mem_stripes); |
3148 | ||
f6bed0ef SL |
3149 | INIT_LIST_HEAD(&log->no_space_stripes); |
3150 | spin_lock_init(&log->no_space_stripes_lock); | |
3151 | ||
3bddb7f8 | 3152 | INIT_WORK(&log->deferred_io_work, r5l_submit_io_async); |
2e38a37f | 3153 | INIT_WORK(&log->disable_writeback_work, r5c_disable_writeback_async); |
3bddb7f8 | 3154 | |
2ded3703 | 3155 | log->r5c_journal_mode = R5C_JOURNAL_MODE_WRITE_THROUGH; |
a39f7afd SL |
3156 | INIT_LIST_HEAD(&log->stripe_in_journal_list); |
3157 | spin_lock_init(&log->stripe_in_journal_lock); | |
3158 | atomic_set(&log->stripe_in_journal_count, 0); | |
2ded3703 | 3159 | |
d2250f10 SL |
3160 | rcu_assign_pointer(conf->log, log); |
3161 | ||
a62ab49e | 3162 | set_bit(MD_HAS_JOURNAL, &conf->mddev->flags); |
f6bed0ef | 3163 | return 0; |
e8deb638 | 3164 | |
0576b1c6 | 3165 | reclaim_thread: |
afeee514 | 3166 | mempool_exit(&log->meta_pool); |
e8deb638 | 3167 | out_mempool: |
afeee514 | 3168 | bioset_exit(&log->bs); |
c38d29b3 | 3169 | io_bs: |
afeee514 | 3170 | mempool_exit(&log->io_pool); |
5036c390 | 3171 | io_pool: |
f6bed0ef SL |
3172 | kmem_cache_destroy(log->io_kc); |
3173 | io_kc: | |
3174 | kfree(log); | |
3175 | return -EINVAL; | |
3176 | } | |
3177 | ||
ff875738 | 3178 | void r5l_exit_log(struct r5conf *conf) |
f6bed0ef | 3179 | { |
ff875738 AP |
3180 | struct r5l_log *log = conf->log; |
3181 | ||
3182 | conf->log = NULL; | |
3183 | synchronize_rcu(); | |
3184 | ||
4d5324f7 N |
3185 | /* Ensure disable_writeback_work wakes up and exits */ |
3186 | wake_up(&conf->mddev->sb_wait); | |
2e38a37f | 3187 | flush_work(&log->disable_writeback_work); |
0576b1c6 | 3188 | md_unregister_thread(&log->reclaim_thread); |
afeee514 KO |
3189 | mempool_exit(&log->meta_pool); |
3190 | bioset_exit(&log->bs); | |
3191 | mempool_exit(&log->io_pool); | |
f6bed0ef SL |
3192 | kmem_cache_destroy(log->io_kc); |
3193 | kfree(log); | |
3194 | } |