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2025cf9e | 1 | // SPDX-License-Identifier: GPL-2.0-only |
3418d036 AP |
2 | /* |
3 | * Partial Parity Log for closing the RAID5 write hole | |
4 | * Copyright (c) 2017, Intel Corporation. | |
3418d036 AP |
5 | */ |
6 | ||
7 | #include <linux/kernel.h> | |
8 | #include <linux/blkdev.h> | |
9 | #include <linux/slab.h> | |
10 | #include <linux/crc32c.h> | |
3418d036 AP |
11 | #include <linux/async_tx.h> |
12 | #include <linux/raid/md_p.h> | |
13 | #include "md.h" | |
14 | #include "raid5.h" | |
a596d086 | 15 | #include "raid5-log.h" |
3418d036 AP |
16 | |
17 | /* | |
18 | * PPL consists of a 4KB header (struct ppl_header) and at least 128KB for | |
19 | * partial parity data. The header contains an array of entries | |
20 | * (struct ppl_header_entry) which describe the logged write requests. | |
21 | * Partial parity for the entries comes after the header, written in the same | |
22 | * sequence as the entries: | |
23 | * | |
24 | * Header | |
25 | * entry0 | |
26 | * ... | |
27 | * entryN | |
28 | * PP data | |
29 | * PP for entry0 | |
30 | * ... | |
31 | * PP for entryN | |
32 | * | |
33 | * An entry describes one or more consecutive stripe_heads, up to a full | |
34 | * stripe. The modifed raid data chunks form an m-by-n matrix, where m is the | |
35 | * number of stripe_heads in the entry and n is the number of modified data | |
36 | * disks. Every stripe_head in the entry must write to the same data disks. | |
37 | * An example of a valid case described by a single entry (writes to the first | |
38 | * stripe of a 4 disk array, 16k chunk size): | |
39 | * | |
40 | * sh->sector dd0 dd1 dd2 ppl | |
41 | * +-----+-----+-----+ | |
42 | * 0 | --- | --- | --- | +----+ | |
43 | * 8 | -W- | -W- | --- | | pp | data_sector = 8 | |
44 | * 16 | -W- | -W- | --- | | pp | data_size = 3 * 2 * 4k | |
45 | * 24 | -W- | -W- | --- | | pp | pp_size = 3 * 4k | |
46 | * +-----+-----+-----+ +----+ | |
47 | * | |
48 | * data_sector is the first raid sector of the modified data, data_size is the | |
49 | * total size of modified data and pp_size is the size of partial parity for | |
50 | * this entry. Entries for full stripe writes contain no partial parity | |
51 | * (pp_size = 0), they only mark the stripes for which parity should be | |
52 | * recalculated after an unclean shutdown. Every entry holds a checksum of its | |
53 | * partial parity, the header also has a checksum of the header itself. | |
54 | * | |
55 | * A write request is always logged to the PPL instance stored on the parity | |
56 | * disk of the corresponding stripe. For each member disk there is one ppl_log | |
57 | * used to handle logging for this disk, independently from others. They are | |
58 | * grouped in child_logs array in struct ppl_conf, which is assigned to | |
59 | * r5conf->log_private. | |
60 | * | |
61 | * ppl_io_unit represents a full PPL write, header_page contains the ppl_header. | |
62 | * PPL entries for logged stripes are added in ppl_log_stripe(). A stripe_head | |
63 | * can be appended to the last entry if it meets the conditions for a valid | |
64 | * entry described above, otherwise a new entry is added. Checksums of entries | |
65 | * are calculated incrementally as stripes containing partial parity are being | |
66 | * added. ppl_submit_iounit() calculates the checksum of the header and submits | |
67 | * a bio containing the header page and partial parity pages (sh->ppl_page) for | |
68 | * all stripes of the io_unit. When the PPL write completes, the stripes | |
69 | * associated with the io_unit are released and raid5d starts writing their data | |
70 | * and parity. When all stripes are written, the io_unit is freed and the next | |
71 | * can be submitted. | |
72 | * | |
73 | * An io_unit is used to gather stripes until it is submitted or becomes full | |
74 | * (if the maximum number of entries or size of PPL is reached). Another io_unit | |
75 | * can't be submitted until the previous has completed (PPL and stripe | |
76 | * data+parity is written). The log->io_list tracks all io_units of a log | |
77 | * (for a single member disk). New io_units are added to the end of the list | |
78 | * and the first io_unit is submitted, if it is not submitted already. | |
79 | * The current io_unit accepting new stripes is always at the end of the list. | |
1532d9e8 TM |
80 | * |
81 | * If write-back cache is enabled for any of the disks in the array, its data | |
82 | * must be flushed before next io_unit is submitted. | |
3418d036 AP |
83 | */ |
84 | ||
ddc08823 PB |
85 | #define PPL_SPACE_SIZE (128 * 1024) |
86 | ||
3418d036 AP |
87 | struct ppl_conf { |
88 | struct mddev *mddev; | |
89 | ||
90 | /* array of child logs, one for each raid disk */ | |
91 | struct ppl_log *child_logs; | |
92 | int count; | |
93 | ||
94 | int block_size; /* the logical block size used for data_sector | |
95 | * in ppl_header_entry */ | |
96 | u32 signature; /* raid array identifier */ | |
97 | atomic64_t seq; /* current log write sequence number */ | |
98 | ||
99 | struct kmem_cache *io_kc; | |
afeee514 KO |
100 | mempool_t io_pool; |
101 | struct bio_set bs; | |
102 | struct bio_set flush_bs; | |
4536bf9b AP |
103 | |
104 | /* used only for recovery */ | |
105 | int recovered_entries; | |
106 | int mismatch_count; | |
94568f64 AP |
107 | |
108 | /* stripes to retry if failed to allocate io_unit */ | |
109 | struct list_head no_mem_stripes; | |
110 | spinlock_t no_mem_stripes_lock; | |
a596d086 MD |
111 | |
112 | unsigned short write_hint; | |
3418d036 AP |
113 | }; |
114 | ||
115 | struct ppl_log { | |
116 | struct ppl_conf *ppl_conf; /* shared between all log instances */ | |
117 | ||
118 | struct md_rdev *rdev; /* array member disk associated with | |
119 | * this log instance */ | |
120 | struct mutex io_mutex; | |
121 | struct ppl_io_unit *current_io; /* current io_unit accepting new data | |
122 | * always at the end of io_list */ | |
123 | spinlock_t io_list_lock; | |
124 | struct list_head io_list; /* all io_units of this log */ | |
ddc08823 PB |
125 | |
126 | sector_t next_io_sector; | |
127 | unsigned int entry_space; | |
128 | bool use_multippl; | |
1532d9e8 TM |
129 | bool wb_cache_on; |
130 | unsigned long disk_flush_bitmap; | |
3418d036 AP |
131 | }; |
132 | ||
133 | #define PPL_IO_INLINE_BVECS 32 | |
134 | ||
135 | struct ppl_io_unit { | |
136 | struct ppl_log *log; | |
137 | ||
138 | struct page *header_page; /* for ppl_header */ | |
139 | ||
140 | unsigned int entries_count; /* number of entries in ppl_header */ | |
141 | unsigned int pp_size; /* total size current of partial parity */ | |
142 | ||
143 | u64 seq; /* sequence number of this log write */ | |
144 | struct list_head log_sibling; /* log->io_list */ | |
145 | ||
146 | struct list_head stripe_list; /* stripes added to the io_unit */ | |
147 | atomic_t pending_stripes; /* how many stripes not written to raid */ | |
1532d9e8 | 148 | atomic_t pending_flushes; /* how many disk flushes are in progress */ |
3418d036 AP |
149 | |
150 | bool submitted; /* true if write to log started */ | |
151 | ||
152 | /* inline bio and its biovec for submitting the iounit */ | |
153 | struct bio bio; | |
154 | struct bio_vec biovec[PPL_IO_INLINE_BVECS]; | |
155 | }; | |
156 | ||
157 | struct dma_async_tx_descriptor * | |
158 | ops_run_partial_parity(struct stripe_head *sh, struct raid5_percpu *percpu, | |
159 | struct dma_async_tx_descriptor *tx) | |
160 | { | |
161 | int disks = sh->disks; | |
b330e6a4 | 162 | struct page **srcs = percpu->scribble; |
3418d036 AP |
163 | int count = 0, pd_idx = sh->pd_idx, i; |
164 | struct async_submit_ctl submit; | |
165 | ||
166 | pr_debug("%s: stripe %llu\n", __func__, (unsigned long long)sh->sector); | |
167 | ||
168 | /* | |
169 | * Partial parity is the XOR of stripe data chunks that are not changed | |
170 | * during the write request. Depending on available data | |
171 | * (read-modify-write vs. reconstruct-write case) we calculate it | |
172 | * differently. | |
173 | */ | |
174 | if (sh->reconstruct_state == reconstruct_state_prexor_drain_run) { | |
ae1713e2 AP |
175 | /* |
176 | * rmw: xor old data and parity from updated disks | |
177 | * This is calculated earlier by ops_run_prexor5() so just copy | |
178 | * the parity dev page. | |
179 | */ | |
180 | srcs[count++] = sh->dev[pd_idx].page; | |
3418d036 AP |
181 | } else if (sh->reconstruct_state == reconstruct_state_drain_run) { |
182 | /* rcw: xor data from all not updated disks */ | |
183 | for (i = disks; i--;) { | |
184 | struct r5dev *dev = &sh->dev[i]; | |
185 | if (test_bit(R5_UPTODATE, &dev->flags)) | |
ae1713e2 | 186 | srcs[count++] = dev->page; |
3418d036 AP |
187 | } |
188 | } else { | |
189 | return tx; | |
190 | } | |
191 | ||
192 | init_async_submit(&submit, ASYNC_TX_FENCE|ASYNC_TX_XOR_ZERO_DST, tx, | |
b330e6a4 | 193 | NULL, sh, (void *) (srcs + sh->disks + 2)); |
3418d036 AP |
194 | |
195 | if (count == 1) | |
ae1713e2 | 196 | tx = async_memcpy(sh->ppl_page, srcs[0], 0, 0, PAGE_SIZE, |
3418d036 AP |
197 | &submit); |
198 | else | |
ae1713e2 | 199 | tx = async_xor(sh->ppl_page, srcs, 0, count, PAGE_SIZE, |
3418d036 AP |
200 | &submit); |
201 | ||
202 | return tx; | |
203 | } | |
204 | ||
fcd403af AP |
205 | static void *ppl_io_pool_alloc(gfp_t gfp_mask, void *pool_data) |
206 | { | |
207 | struct kmem_cache *kc = pool_data; | |
208 | struct ppl_io_unit *io; | |
209 | ||
210 | io = kmem_cache_alloc(kc, gfp_mask); | |
211 | if (!io) | |
212 | return NULL; | |
213 | ||
214 | io->header_page = alloc_page(gfp_mask); | |
215 | if (!io->header_page) { | |
216 | kmem_cache_free(kc, io); | |
217 | return NULL; | |
218 | } | |
219 | ||
220 | return io; | |
221 | } | |
222 | ||
223 | static void ppl_io_pool_free(void *element, void *pool_data) | |
224 | { | |
225 | struct kmem_cache *kc = pool_data; | |
226 | struct ppl_io_unit *io = element; | |
227 | ||
228 | __free_page(io->header_page); | |
229 | kmem_cache_free(kc, io); | |
230 | } | |
231 | ||
3418d036 AP |
232 | static struct ppl_io_unit *ppl_new_iounit(struct ppl_log *log, |
233 | struct stripe_head *sh) | |
234 | { | |
235 | struct ppl_conf *ppl_conf = log->ppl_conf; | |
236 | struct ppl_io_unit *io; | |
237 | struct ppl_header *pplhdr; | |
fcd403af | 238 | struct page *header_page; |
3418d036 | 239 | |
afeee514 | 240 | io = mempool_alloc(&ppl_conf->io_pool, GFP_NOWAIT); |
3418d036 AP |
241 | if (!io) |
242 | return NULL; | |
243 | ||
fcd403af | 244 | header_page = io->header_page; |
3418d036 | 245 | memset(io, 0, sizeof(*io)); |
fcd403af AP |
246 | io->header_page = header_page; |
247 | ||
3418d036 AP |
248 | io->log = log; |
249 | INIT_LIST_HEAD(&io->log_sibling); | |
250 | INIT_LIST_HEAD(&io->stripe_list); | |
251 | atomic_set(&io->pending_stripes, 0); | |
1532d9e8 | 252 | atomic_set(&io->pending_flushes, 0); |
3418d036 AP |
253 | bio_init(&io->bio, io->biovec, PPL_IO_INLINE_BVECS); |
254 | ||
3418d036 AP |
255 | pplhdr = page_address(io->header_page); |
256 | clear_page(pplhdr); | |
257 | memset(pplhdr->reserved, 0xff, PPL_HDR_RESERVED); | |
258 | pplhdr->signature = cpu_to_le32(ppl_conf->signature); | |
259 | ||
260 | io->seq = atomic64_add_return(1, &ppl_conf->seq); | |
261 | pplhdr->generation = cpu_to_le64(io->seq); | |
262 | ||
263 | return io; | |
264 | } | |
265 | ||
266 | static int ppl_log_stripe(struct ppl_log *log, struct stripe_head *sh) | |
267 | { | |
268 | struct ppl_io_unit *io = log->current_io; | |
269 | struct ppl_header_entry *e = NULL; | |
270 | struct ppl_header *pplhdr; | |
271 | int i; | |
272 | sector_t data_sector = 0; | |
273 | int data_disks = 0; | |
3418d036 AP |
274 | struct r5conf *conf = sh->raid_conf; |
275 | ||
276 | pr_debug("%s: stripe: %llu\n", __func__, (unsigned long long)sh->sector); | |
277 | ||
278 | /* check if current io_unit is full */ | |
ddc08823 | 279 | if (io && (io->pp_size == log->entry_space || |
3418d036 AP |
280 | io->entries_count == PPL_HDR_MAX_ENTRIES)) { |
281 | pr_debug("%s: add io_unit blocked by seq: %llu\n", | |
282 | __func__, io->seq); | |
283 | io = NULL; | |
284 | } | |
285 | ||
286 | /* add a new unit if there is none or the current is full */ | |
287 | if (!io) { | |
288 | io = ppl_new_iounit(log, sh); | |
289 | if (!io) | |
290 | return -ENOMEM; | |
291 | spin_lock_irq(&log->io_list_lock); | |
292 | list_add_tail(&io->log_sibling, &log->io_list); | |
293 | spin_unlock_irq(&log->io_list_lock); | |
294 | ||
295 | log->current_io = io; | |
296 | } | |
297 | ||
298 | for (i = 0; i < sh->disks; i++) { | |
299 | struct r5dev *dev = &sh->dev[i]; | |
300 | ||
301 | if (i != sh->pd_idx && test_bit(R5_Wantwrite, &dev->flags)) { | |
302 | if (!data_disks || dev->sector < data_sector) | |
303 | data_sector = dev->sector; | |
304 | data_disks++; | |
305 | } | |
306 | } | |
307 | BUG_ON(!data_disks); | |
308 | ||
309 | pr_debug("%s: seq: %llu data_sector: %llu data_disks: %d\n", __func__, | |
310 | io->seq, (unsigned long long)data_sector, data_disks); | |
311 | ||
312 | pplhdr = page_address(io->header_page); | |
313 | ||
314 | if (io->entries_count > 0) { | |
315 | struct ppl_header_entry *last = | |
316 | &pplhdr->entries[io->entries_count - 1]; | |
317 | struct stripe_head *sh_last = list_last_entry( | |
318 | &io->stripe_list, struct stripe_head, log_list); | |
319 | u64 data_sector_last = le64_to_cpu(last->data_sector); | |
320 | u32 data_size_last = le32_to_cpu(last->data_size); | |
321 | ||
322 | /* | |
323 | * Check if we can append the stripe to the last entry. It must | |
324 | * be just after the last logged stripe and write to the same | |
325 | * disks. Use bit shift and logarithm to avoid 64-bit division. | |
326 | */ | |
c911c46c | 327 | if ((sh->sector == sh_last->sector + RAID5_STRIPE_SECTORS(conf)) && |
3418d036 AP |
328 | (data_sector >> ilog2(conf->chunk_sectors) == |
329 | data_sector_last >> ilog2(conf->chunk_sectors)) && | |
330 | ((data_sector - data_sector_last) * data_disks == | |
331 | data_size_last >> 9)) | |
332 | e = last; | |
333 | } | |
334 | ||
335 | if (!e) { | |
336 | e = &pplhdr->entries[io->entries_count++]; | |
337 | e->data_sector = cpu_to_le64(data_sector); | |
338 | e->parity_disk = cpu_to_le32(sh->pd_idx); | |
339 | e->checksum = cpu_to_le32(~0); | |
340 | } | |
341 | ||
342 | le32_add_cpu(&e->data_size, data_disks << PAGE_SHIFT); | |
343 | ||
344 | /* don't write any PP if full stripe write */ | |
345 | if (!test_bit(STRIPE_FULL_WRITE, &sh->state)) { | |
346 | le32_add_cpu(&e->pp_size, PAGE_SIZE); | |
347 | io->pp_size += PAGE_SIZE; | |
348 | e->checksum = cpu_to_le32(crc32c_le(le32_to_cpu(e->checksum), | |
349 | page_address(sh->ppl_page), | |
350 | PAGE_SIZE)); | |
351 | } | |
352 | ||
353 | list_add_tail(&sh->log_list, &io->stripe_list); | |
354 | atomic_inc(&io->pending_stripes); | |
355 | sh->ppl_io = io; | |
356 | ||
357 | return 0; | |
358 | } | |
359 | ||
360 | int ppl_write_stripe(struct r5conf *conf, struct stripe_head *sh) | |
361 | { | |
362 | struct ppl_conf *ppl_conf = conf->log_private; | |
363 | struct ppl_io_unit *io = sh->ppl_io; | |
364 | struct ppl_log *log; | |
365 | ||
845b9e22 | 366 | if (io || test_bit(STRIPE_SYNCING, &sh->state) || !sh->ppl_page || |
3418d036 AP |
367 | !test_bit(R5_Wantwrite, &sh->dev[sh->pd_idx].flags) || |
368 | !test_bit(R5_Insync, &sh->dev[sh->pd_idx].flags)) { | |
369 | clear_bit(STRIPE_LOG_TRAPPED, &sh->state); | |
370 | return -EAGAIN; | |
371 | } | |
372 | ||
373 | log = &ppl_conf->child_logs[sh->pd_idx]; | |
374 | ||
375 | mutex_lock(&log->io_mutex); | |
376 | ||
377 | if (!log->rdev || test_bit(Faulty, &log->rdev->flags)) { | |
378 | mutex_unlock(&log->io_mutex); | |
379 | return -EAGAIN; | |
380 | } | |
381 | ||
382 | set_bit(STRIPE_LOG_TRAPPED, &sh->state); | |
383 | clear_bit(STRIPE_DELAYED, &sh->state); | |
384 | atomic_inc(&sh->count); | |
385 | ||
386 | if (ppl_log_stripe(log, sh)) { | |
94568f64 AP |
387 | spin_lock_irq(&ppl_conf->no_mem_stripes_lock); |
388 | list_add_tail(&sh->log_list, &ppl_conf->no_mem_stripes); | |
389 | spin_unlock_irq(&ppl_conf->no_mem_stripes_lock); | |
3418d036 AP |
390 | } |
391 | ||
392 | mutex_unlock(&log->io_mutex); | |
393 | ||
394 | return 0; | |
395 | } | |
396 | ||
397 | static void ppl_log_endio(struct bio *bio) | |
398 | { | |
399 | struct ppl_io_unit *io = bio->bi_private; | |
400 | struct ppl_log *log = io->log; | |
401 | struct ppl_conf *ppl_conf = log->ppl_conf; | |
402 | struct stripe_head *sh, *next; | |
403 | ||
404 | pr_debug("%s: seq: %llu\n", __func__, io->seq); | |
405 | ||
4e4cbee9 | 406 | if (bio->bi_status) |
3418d036 AP |
407 | md_error(ppl_conf->mddev, log->rdev); |
408 | ||
3418d036 AP |
409 | list_for_each_entry_safe(sh, next, &io->stripe_list, log_list) { |
410 | list_del_init(&sh->log_list); | |
411 | ||
412 | set_bit(STRIPE_HANDLE, &sh->state); | |
413 | raid5_release_stripe(sh); | |
414 | } | |
415 | } | |
416 | ||
417 | static void ppl_submit_iounit_bio(struct ppl_io_unit *io, struct bio *bio) | |
418 | { | |
419 | char b[BDEVNAME_SIZE]; | |
420 | ||
421 | pr_debug("%s: seq: %llu size: %u sector: %llu dev: %s\n", | |
422 | __func__, io->seq, bio->bi_iter.bi_size, | |
423 | (unsigned long long)bio->bi_iter.bi_sector, | |
74d46992 | 424 | bio_devname(bio, b)); |
3418d036 AP |
425 | |
426 | submit_bio(bio); | |
427 | } | |
428 | ||
429 | static void ppl_submit_iounit(struct ppl_io_unit *io) | |
430 | { | |
431 | struct ppl_log *log = io->log; | |
432 | struct ppl_conf *ppl_conf = log->ppl_conf; | |
433 | struct ppl_header *pplhdr = page_address(io->header_page); | |
434 | struct bio *bio = &io->bio; | |
435 | struct stripe_head *sh; | |
436 | int i; | |
437 | ||
6358c239 AP |
438 | bio->bi_private = io; |
439 | ||
440 | if (!log->rdev || test_bit(Faulty, &log->rdev->flags)) { | |
441 | ppl_log_endio(bio); | |
442 | return; | |
443 | } | |
444 | ||
3418d036 AP |
445 | for (i = 0; i < io->entries_count; i++) { |
446 | struct ppl_header_entry *e = &pplhdr->entries[i]; | |
447 | ||
448 | pr_debug("%s: seq: %llu entry: %d data_sector: %llu pp_size: %u data_size: %u\n", | |
449 | __func__, io->seq, i, le64_to_cpu(e->data_sector), | |
450 | le32_to_cpu(e->pp_size), le32_to_cpu(e->data_size)); | |
451 | ||
452 | e->data_sector = cpu_to_le64(le64_to_cpu(e->data_sector) >> | |
453 | ilog2(ppl_conf->block_size >> 9)); | |
454 | e->checksum = cpu_to_le32(~le32_to_cpu(e->checksum)); | |
455 | } | |
456 | ||
457 | pplhdr->entries_count = cpu_to_le32(io->entries_count); | |
458 | pplhdr->checksum = cpu_to_le32(~crc32c_le(~0, pplhdr, PPL_HEADER_SIZE)); | |
459 | ||
ddc08823 PB |
460 | /* Rewind the buffer if current PPL is larger then remaining space */ |
461 | if (log->use_multippl && | |
462 | log->rdev->ppl.sector + log->rdev->ppl.size - log->next_io_sector < | |
463 | (PPL_HEADER_SIZE + io->pp_size) >> 9) | |
464 | log->next_io_sector = log->rdev->ppl.sector; | |
465 | ||
466 | ||
3418d036 AP |
467 | bio->bi_end_io = ppl_log_endio; |
468 | bio->bi_opf = REQ_OP_WRITE | REQ_FUA; | |
74d46992 | 469 | bio_set_dev(bio, log->rdev->bdev); |
ddc08823 | 470 | bio->bi_iter.bi_sector = log->next_io_sector; |
3418d036 | 471 | bio_add_page(bio, io->header_page, PAGE_SIZE, 0); |
a596d086 | 472 | bio->bi_write_hint = ppl_conf->write_hint; |
3418d036 | 473 | |
ddc08823 PB |
474 | pr_debug("%s: log->current_io_sector: %llu\n", __func__, |
475 | (unsigned long long)log->next_io_sector); | |
476 | ||
477 | if (log->use_multippl) | |
478 | log->next_io_sector += (PPL_HEADER_SIZE + io->pp_size) >> 9; | |
479 | ||
1532d9e8 TM |
480 | WARN_ON(log->disk_flush_bitmap != 0); |
481 | ||
3418d036 | 482 | list_for_each_entry(sh, &io->stripe_list, log_list) { |
1532d9e8 TM |
483 | for (i = 0; i < sh->disks; i++) { |
484 | struct r5dev *dev = &sh->dev[i]; | |
485 | ||
486 | if ((ppl_conf->child_logs[i].wb_cache_on) && | |
487 | (test_bit(R5_Wantwrite, &dev->flags))) { | |
488 | set_bit(i, &log->disk_flush_bitmap); | |
489 | } | |
490 | } | |
491 | ||
3418d036 AP |
492 | /* entries for full stripe writes have no partial parity */ |
493 | if (test_bit(STRIPE_FULL_WRITE, &sh->state)) | |
494 | continue; | |
495 | ||
496 | if (!bio_add_page(bio, sh->ppl_page, PAGE_SIZE, 0)) { | |
497 | struct bio *prev = bio; | |
498 | ||
499 | bio = bio_alloc_bioset(GFP_NOIO, BIO_MAX_PAGES, | |
afeee514 | 500 | &ppl_conf->bs); |
3418d036 | 501 | bio->bi_opf = prev->bi_opf; |
a596d086 | 502 | bio->bi_write_hint = prev->bi_write_hint; |
74d46992 | 503 | bio_copy_dev(bio, prev); |
3418d036 AP |
504 | bio->bi_iter.bi_sector = bio_end_sector(prev); |
505 | bio_add_page(bio, sh->ppl_page, PAGE_SIZE, 0); | |
506 | ||
507 | bio_chain(bio, prev); | |
508 | ppl_submit_iounit_bio(io, prev); | |
509 | } | |
510 | } | |
511 | ||
512 | ppl_submit_iounit_bio(io, bio); | |
513 | } | |
514 | ||
515 | static void ppl_submit_current_io(struct ppl_log *log) | |
516 | { | |
517 | struct ppl_io_unit *io; | |
518 | ||
519 | spin_lock_irq(&log->io_list_lock); | |
520 | ||
521 | io = list_first_entry_or_null(&log->io_list, struct ppl_io_unit, | |
522 | log_sibling); | |
523 | if (io && io->submitted) | |
524 | io = NULL; | |
525 | ||
526 | spin_unlock_irq(&log->io_list_lock); | |
527 | ||
528 | if (io) { | |
529 | io->submitted = true; | |
530 | ||
531 | if (io == log->current_io) | |
532 | log->current_io = NULL; | |
533 | ||
534 | ppl_submit_iounit(io); | |
535 | } | |
536 | } | |
537 | ||
538 | void ppl_write_stripe_run(struct r5conf *conf) | |
539 | { | |
540 | struct ppl_conf *ppl_conf = conf->log_private; | |
541 | struct ppl_log *log; | |
542 | int i; | |
543 | ||
544 | for (i = 0; i < ppl_conf->count; i++) { | |
545 | log = &ppl_conf->child_logs[i]; | |
546 | ||
547 | mutex_lock(&log->io_mutex); | |
548 | ppl_submit_current_io(log); | |
549 | mutex_unlock(&log->io_mutex); | |
550 | } | |
551 | } | |
552 | ||
553 | static void ppl_io_unit_finished(struct ppl_io_unit *io) | |
554 | { | |
555 | struct ppl_log *log = io->log; | |
94568f64 | 556 | struct ppl_conf *ppl_conf = log->ppl_conf; |
1532d9e8 | 557 | struct r5conf *conf = ppl_conf->mddev->private; |
3418d036 AP |
558 | unsigned long flags; |
559 | ||
560 | pr_debug("%s: seq: %llu\n", __func__, io->seq); | |
561 | ||
94568f64 | 562 | local_irq_save(flags); |
3418d036 | 563 | |
94568f64 | 564 | spin_lock(&log->io_list_lock); |
3418d036 | 565 | list_del(&io->log_sibling); |
94568f64 AP |
566 | spin_unlock(&log->io_list_lock); |
567 | ||
afeee514 | 568 | mempool_free(io, &ppl_conf->io_pool); |
94568f64 AP |
569 | |
570 | spin_lock(&ppl_conf->no_mem_stripes_lock); | |
571 | if (!list_empty(&ppl_conf->no_mem_stripes)) { | |
572 | struct stripe_head *sh; | |
3418d036 | 573 | |
94568f64 AP |
574 | sh = list_first_entry(&ppl_conf->no_mem_stripes, |
575 | struct stripe_head, log_list); | |
3418d036 AP |
576 | list_del_init(&sh->log_list); |
577 | set_bit(STRIPE_HANDLE, &sh->state); | |
578 | raid5_release_stripe(sh); | |
579 | } | |
94568f64 | 580 | spin_unlock(&ppl_conf->no_mem_stripes_lock); |
3418d036 | 581 | |
94568f64 | 582 | local_irq_restore(flags); |
1532d9e8 TM |
583 | |
584 | wake_up(&conf->wait_for_quiescent); | |
585 | } | |
586 | ||
587 | static void ppl_flush_endio(struct bio *bio) | |
588 | { | |
589 | struct ppl_io_unit *io = bio->bi_private; | |
590 | struct ppl_log *log = io->log; | |
591 | struct ppl_conf *ppl_conf = log->ppl_conf; | |
592 | struct r5conf *conf = ppl_conf->mddev->private; | |
593 | char b[BDEVNAME_SIZE]; | |
594 | ||
595 | pr_debug("%s: dev: %s\n", __func__, bio_devname(bio, b)); | |
596 | ||
597 | if (bio->bi_status) { | |
598 | struct md_rdev *rdev; | |
599 | ||
600 | rcu_read_lock(); | |
601 | rdev = md_find_rdev_rcu(conf->mddev, bio_dev(bio)); | |
602 | if (rdev) | |
603 | md_error(rdev->mddev, rdev); | |
604 | rcu_read_unlock(); | |
605 | } | |
606 | ||
607 | bio_put(bio); | |
608 | ||
609 | if (atomic_dec_and_test(&io->pending_flushes)) { | |
610 | ppl_io_unit_finished(io); | |
611 | md_wakeup_thread(conf->mddev->thread); | |
612 | } | |
613 | } | |
614 | ||
615 | static void ppl_do_flush(struct ppl_io_unit *io) | |
616 | { | |
617 | struct ppl_log *log = io->log; | |
618 | struct ppl_conf *ppl_conf = log->ppl_conf; | |
619 | struct r5conf *conf = ppl_conf->mddev->private; | |
620 | int raid_disks = conf->raid_disks; | |
621 | int flushed_disks = 0; | |
622 | int i; | |
623 | ||
624 | atomic_set(&io->pending_flushes, raid_disks); | |
625 | ||
626 | for_each_set_bit(i, &log->disk_flush_bitmap, raid_disks) { | |
627 | struct md_rdev *rdev; | |
628 | struct block_device *bdev = NULL; | |
629 | ||
630 | rcu_read_lock(); | |
631 | rdev = rcu_dereference(conf->disks[i].rdev); | |
632 | if (rdev && !test_bit(Faulty, &rdev->flags)) | |
633 | bdev = rdev->bdev; | |
634 | rcu_read_unlock(); | |
635 | ||
636 | if (bdev) { | |
637 | struct bio *bio; | |
638 | char b[BDEVNAME_SIZE]; | |
639 | ||
afeee514 | 640 | bio = bio_alloc_bioset(GFP_NOIO, 0, &ppl_conf->flush_bs); |
1532d9e8 TM |
641 | bio_set_dev(bio, bdev); |
642 | bio->bi_private = io; | |
643 | bio->bi_opf = REQ_OP_WRITE | REQ_PREFLUSH; | |
644 | bio->bi_end_io = ppl_flush_endio; | |
645 | ||
646 | pr_debug("%s: dev: %s\n", __func__, | |
647 | bio_devname(bio, b)); | |
648 | ||
649 | submit_bio(bio); | |
650 | flushed_disks++; | |
651 | } | |
652 | } | |
653 | ||
654 | log->disk_flush_bitmap = 0; | |
655 | ||
656 | for (i = flushed_disks ; i < raid_disks; i++) { | |
657 | if (atomic_dec_and_test(&io->pending_flushes)) | |
658 | ppl_io_unit_finished(io); | |
659 | } | |
660 | } | |
661 | ||
662 | static inline bool ppl_no_io_unit_submitted(struct r5conf *conf, | |
663 | struct ppl_log *log) | |
664 | { | |
665 | struct ppl_io_unit *io; | |
666 | ||
667 | io = list_first_entry_or_null(&log->io_list, struct ppl_io_unit, | |
668 | log_sibling); | |
669 | ||
670 | return !io || !io->submitted; | |
671 | } | |
672 | ||
673 | void ppl_quiesce(struct r5conf *conf, int quiesce) | |
674 | { | |
675 | struct ppl_conf *ppl_conf = conf->log_private; | |
676 | int i; | |
677 | ||
678 | if (quiesce) { | |
679 | for (i = 0; i < ppl_conf->count; i++) { | |
680 | struct ppl_log *log = &ppl_conf->child_logs[i]; | |
681 | ||
682 | spin_lock_irq(&log->io_list_lock); | |
683 | wait_event_lock_irq(conf->wait_for_quiescent, | |
684 | ppl_no_io_unit_submitted(conf, log), | |
685 | log->io_list_lock); | |
686 | spin_unlock_irq(&log->io_list_lock); | |
687 | } | |
688 | } | |
f4bc0c81 AP |
689 | } |
690 | ||
691 | int ppl_handle_flush_request(struct r5l_log *log, struct bio *bio) | |
692 | { | |
693 | if (bio->bi_iter.bi_size == 0) { | |
694 | bio_endio(bio); | |
695 | return 0; | |
696 | } | |
697 | bio->bi_opf &= ~REQ_PREFLUSH; | |
698 | return -EAGAIN; | |
3418d036 AP |
699 | } |
700 | ||
701 | void ppl_stripe_write_finished(struct stripe_head *sh) | |
702 | { | |
703 | struct ppl_io_unit *io; | |
704 | ||
705 | io = sh->ppl_io; | |
706 | sh->ppl_io = NULL; | |
707 | ||
1532d9e8 TM |
708 | if (io && atomic_dec_and_test(&io->pending_stripes)) { |
709 | if (io->log->disk_flush_bitmap) | |
710 | ppl_do_flush(io); | |
711 | else | |
712 | ppl_io_unit_finished(io); | |
713 | } | |
3418d036 AP |
714 | } |
715 | ||
4536bf9b AP |
716 | static void ppl_xor(int size, struct page *page1, struct page *page2) |
717 | { | |
718 | struct async_submit_ctl submit; | |
719 | struct dma_async_tx_descriptor *tx; | |
720 | struct page *xor_srcs[] = { page1, page2 }; | |
721 | ||
722 | init_async_submit(&submit, ASYNC_TX_ACK|ASYNC_TX_XOR_DROP_DST, | |
723 | NULL, NULL, NULL, NULL); | |
724 | tx = async_xor(page1, xor_srcs, 0, 2, size, &submit); | |
725 | ||
726 | async_tx_quiesce(&tx); | |
727 | } | |
728 | ||
729 | /* | |
730 | * PPL recovery strategy: xor partial parity and data from all modified data | |
731 | * disks within a stripe and write the result as the new stripe parity. If all | |
732 | * stripe data disks are modified (full stripe write), no partial parity is | |
733 | * available, so just xor the data disks. | |
734 | * | |
735 | * Recovery of a PPL entry shall occur only if all modified data disks are | |
736 | * available and read from all of them succeeds. | |
737 | * | |
738 | * A PPL entry applies to a stripe, partial parity size for an entry is at most | |
739 | * the size of the chunk. Examples of possible cases for a single entry: | |
740 | * | |
741 | * case 0: single data disk write: | |
742 | * data0 data1 data2 ppl parity | |
743 | * +--------+--------+--------+ +--------------------+ | |
744 | * | ------ | ------ | ------ | +----+ | (no change) | | |
745 | * | ------ | -data- | ------ | | pp | -> | data1 ^ pp | | |
746 | * | ------ | -data- | ------ | | pp | -> | data1 ^ pp | | |
747 | * | ------ | ------ | ------ | +----+ | (no change) | | |
748 | * +--------+--------+--------+ +--------------------+ | |
749 | * pp_size = data_size | |
750 | * | |
751 | * case 1: more than one data disk write: | |
752 | * data0 data1 data2 ppl parity | |
753 | * +--------+--------+--------+ +--------------------+ | |
754 | * | ------ | ------ | ------ | +----+ | (no change) | | |
755 | * | -data- | -data- | ------ | | pp | -> | data0 ^ data1 ^ pp | | |
756 | * | -data- | -data- | ------ | | pp | -> | data0 ^ data1 ^ pp | | |
757 | * | ------ | ------ | ------ | +----+ | (no change) | | |
758 | * +--------+--------+--------+ +--------------------+ | |
759 | * pp_size = data_size / modified_data_disks | |
760 | * | |
761 | * case 2: write to all data disks (also full stripe write): | |
762 | * data0 data1 data2 parity | |
763 | * +--------+--------+--------+ +--------------------+ | |
764 | * | ------ | ------ | ------ | | (no change) | | |
765 | * | -data- | -data- | -data- | --------> | xor all data | | |
766 | * | ------ | ------ | ------ | --------> | (no change) | | |
767 | * | ------ | ------ | ------ | | (no change) | | |
768 | * +--------+--------+--------+ +--------------------+ | |
769 | * pp_size = 0 | |
770 | * | |
771 | * The following cases are possible only in other implementations. The recovery | |
772 | * code can handle them, but they are not generated at runtime because they can | |
773 | * be reduced to cases 0, 1 and 2: | |
774 | * | |
775 | * case 3: | |
776 | * data0 data1 data2 ppl parity | |
777 | * +--------+--------+--------+ +----+ +--------------------+ | |
778 | * | ------ | -data- | -data- | | pp | | data1 ^ data2 ^ pp | | |
779 | * | ------ | -data- | -data- | | pp | -> | data1 ^ data2 ^ pp | | |
780 | * | -data- | -data- | -data- | | -- | -> | xor all data | | |
781 | * | -data- | -data- | ------ | | pp | | data0 ^ data1 ^ pp | | |
782 | * +--------+--------+--------+ +----+ +--------------------+ | |
783 | * pp_size = chunk_size | |
784 | * | |
785 | * case 4: | |
786 | * data0 data1 data2 ppl parity | |
787 | * +--------+--------+--------+ +----+ +--------------------+ | |
788 | * | ------ | -data- | ------ | | pp | | data1 ^ pp | | |
789 | * | ------ | ------ | ------ | | -- | -> | (no change) | | |
790 | * | ------ | ------ | ------ | | -- | -> | (no change) | | |
791 | * | -data- | ------ | ------ | | pp | | data0 ^ pp | | |
792 | * +--------+--------+--------+ +----+ +--------------------+ | |
793 | * pp_size = chunk_size | |
794 | */ | |
795 | static int ppl_recover_entry(struct ppl_log *log, struct ppl_header_entry *e, | |
796 | sector_t ppl_sector) | |
797 | { | |
798 | struct ppl_conf *ppl_conf = log->ppl_conf; | |
799 | struct mddev *mddev = ppl_conf->mddev; | |
800 | struct r5conf *conf = mddev->private; | |
801 | int block_size = ppl_conf->block_size; | |
802 | struct page *page1; | |
803 | struct page *page2; | |
804 | sector_t r_sector_first; | |
805 | sector_t r_sector_last; | |
806 | int strip_sectors; | |
807 | int data_disks; | |
808 | int i; | |
809 | int ret = 0; | |
810 | char b[BDEVNAME_SIZE]; | |
811 | unsigned int pp_size = le32_to_cpu(e->pp_size); | |
812 | unsigned int data_size = le32_to_cpu(e->data_size); | |
813 | ||
814 | page1 = alloc_page(GFP_KERNEL); | |
815 | page2 = alloc_page(GFP_KERNEL); | |
816 | ||
817 | if (!page1 || !page2) { | |
818 | ret = -ENOMEM; | |
819 | goto out; | |
820 | } | |
821 | ||
822 | r_sector_first = le64_to_cpu(e->data_sector) * (block_size >> 9); | |
823 | ||
824 | if ((pp_size >> 9) < conf->chunk_sectors) { | |
825 | if (pp_size > 0) { | |
826 | data_disks = data_size / pp_size; | |
827 | strip_sectors = pp_size >> 9; | |
828 | } else { | |
829 | data_disks = conf->raid_disks - conf->max_degraded; | |
830 | strip_sectors = (data_size >> 9) / data_disks; | |
831 | } | |
832 | r_sector_last = r_sector_first + | |
833 | (data_disks - 1) * conf->chunk_sectors + | |
834 | strip_sectors; | |
835 | } else { | |
836 | data_disks = conf->raid_disks - conf->max_degraded; | |
837 | strip_sectors = conf->chunk_sectors; | |
838 | r_sector_last = r_sector_first + (data_size >> 9); | |
839 | } | |
840 | ||
841 | pr_debug("%s: array sector first: %llu last: %llu\n", __func__, | |
842 | (unsigned long long)r_sector_first, | |
843 | (unsigned long long)r_sector_last); | |
844 | ||
845 | /* if start and end is 4k aligned, use a 4k block */ | |
846 | if (block_size == 512 && | |
c911c46c YY |
847 | (r_sector_first & (RAID5_STRIPE_SECTORS(conf) - 1)) == 0 && |
848 | (r_sector_last & (RAID5_STRIPE_SECTORS(conf) - 1)) == 0) | |
849 | block_size = RAID5_STRIPE_SIZE(conf); | |
4536bf9b AP |
850 | |
851 | /* iterate through blocks in strip */ | |
852 | for (i = 0; i < strip_sectors; i += (block_size >> 9)) { | |
853 | bool update_parity = false; | |
854 | sector_t parity_sector; | |
855 | struct md_rdev *parity_rdev; | |
856 | struct stripe_head sh; | |
857 | int disk; | |
858 | int indent = 0; | |
859 | ||
860 | pr_debug("%s:%*s iter %d start\n", __func__, indent, "", i); | |
861 | indent += 2; | |
862 | ||
863 | memset(page_address(page1), 0, PAGE_SIZE); | |
864 | ||
865 | /* iterate through data member disks */ | |
866 | for (disk = 0; disk < data_disks; disk++) { | |
867 | int dd_idx; | |
868 | struct md_rdev *rdev; | |
869 | sector_t sector; | |
870 | sector_t r_sector = r_sector_first + i + | |
871 | (disk * conf->chunk_sectors); | |
872 | ||
873 | pr_debug("%s:%*s data member disk %d start\n", | |
874 | __func__, indent, "", disk); | |
875 | indent += 2; | |
876 | ||
877 | if (r_sector >= r_sector_last) { | |
878 | pr_debug("%s:%*s array sector %llu doesn't need parity update\n", | |
879 | __func__, indent, "", | |
880 | (unsigned long long)r_sector); | |
881 | indent -= 2; | |
882 | continue; | |
883 | } | |
884 | ||
885 | update_parity = true; | |
886 | ||
887 | /* map raid sector to member disk */ | |
888 | sector = raid5_compute_sector(conf, r_sector, 0, | |
889 | &dd_idx, NULL); | |
890 | pr_debug("%s:%*s processing array sector %llu => data member disk %d, sector %llu\n", | |
891 | __func__, indent, "", | |
892 | (unsigned long long)r_sector, dd_idx, | |
893 | (unsigned long long)sector); | |
894 | ||
895 | rdev = conf->disks[dd_idx].rdev; | |
07719ff7 AP |
896 | if (!rdev || (!test_bit(In_sync, &rdev->flags) && |
897 | sector >= rdev->recovery_offset)) { | |
4536bf9b AP |
898 | pr_debug("%s:%*s data member disk %d missing\n", |
899 | __func__, indent, "", dd_idx); | |
900 | update_parity = false; | |
901 | break; | |
902 | } | |
903 | ||
904 | pr_debug("%s:%*s reading data member disk %s sector %llu\n", | |
905 | __func__, indent, "", bdevname(rdev->bdev, b), | |
906 | (unsigned long long)sector); | |
907 | if (!sync_page_io(rdev, sector, block_size, page2, | |
908 | REQ_OP_READ, 0, false)) { | |
909 | md_error(mddev, rdev); | |
910 | pr_debug("%s:%*s read failed!\n", __func__, | |
911 | indent, ""); | |
912 | ret = -EIO; | |
913 | goto out; | |
914 | } | |
915 | ||
916 | ppl_xor(block_size, page1, page2); | |
917 | ||
918 | indent -= 2; | |
919 | } | |
920 | ||
921 | if (!update_parity) | |
922 | continue; | |
923 | ||
924 | if (pp_size > 0) { | |
925 | pr_debug("%s:%*s reading pp disk sector %llu\n", | |
926 | __func__, indent, "", | |
927 | (unsigned long long)(ppl_sector + i)); | |
928 | if (!sync_page_io(log->rdev, | |
929 | ppl_sector - log->rdev->data_offset + i, | |
930 | block_size, page2, REQ_OP_READ, 0, | |
931 | false)) { | |
932 | pr_debug("%s:%*s read failed!\n", __func__, | |
933 | indent, ""); | |
934 | md_error(mddev, log->rdev); | |
935 | ret = -EIO; | |
936 | goto out; | |
937 | } | |
938 | ||
939 | ppl_xor(block_size, page1, page2); | |
940 | } | |
941 | ||
942 | /* map raid sector to parity disk */ | |
943 | parity_sector = raid5_compute_sector(conf, r_sector_first + i, | |
944 | 0, &disk, &sh); | |
945 | BUG_ON(sh.pd_idx != le32_to_cpu(e->parity_disk)); | |
946 | parity_rdev = conf->disks[sh.pd_idx].rdev; | |
947 | ||
948 | BUG_ON(parity_rdev->bdev->bd_dev != log->rdev->bdev->bd_dev); | |
949 | pr_debug("%s:%*s write parity at sector %llu, disk %s\n", | |
950 | __func__, indent, "", | |
951 | (unsigned long long)parity_sector, | |
952 | bdevname(parity_rdev->bdev, b)); | |
953 | if (!sync_page_io(parity_rdev, parity_sector, block_size, | |
954 | page1, REQ_OP_WRITE, 0, false)) { | |
955 | pr_debug("%s:%*s parity write error!\n", __func__, | |
956 | indent, ""); | |
957 | md_error(mddev, parity_rdev); | |
958 | ret = -EIO; | |
959 | goto out; | |
960 | } | |
961 | } | |
962 | out: | |
963 | if (page1) | |
964 | __free_page(page1); | |
965 | if (page2) | |
966 | __free_page(page2); | |
967 | return ret; | |
968 | } | |
969 | ||
675dc2cc PB |
970 | static int ppl_recover(struct ppl_log *log, struct ppl_header *pplhdr, |
971 | sector_t offset) | |
4536bf9b AP |
972 | { |
973 | struct ppl_conf *ppl_conf = log->ppl_conf; | |
974 | struct md_rdev *rdev = log->rdev; | |
975 | struct mddev *mddev = rdev->mddev; | |
675dc2cc PB |
976 | sector_t ppl_sector = rdev->ppl.sector + offset + |
977 | (PPL_HEADER_SIZE >> 9); | |
4536bf9b AP |
978 | struct page *page; |
979 | int i; | |
980 | int ret = 0; | |
981 | ||
982 | page = alloc_page(GFP_KERNEL); | |
983 | if (!page) | |
984 | return -ENOMEM; | |
985 | ||
986 | /* iterate through all PPL entries saved */ | |
987 | for (i = 0; i < le32_to_cpu(pplhdr->entries_count); i++) { | |
988 | struct ppl_header_entry *e = &pplhdr->entries[i]; | |
989 | u32 pp_size = le32_to_cpu(e->pp_size); | |
990 | sector_t sector = ppl_sector; | |
991 | int ppl_entry_sectors = pp_size >> 9; | |
992 | u32 crc, crc_stored; | |
993 | ||
994 | pr_debug("%s: disk: %d entry: %d ppl_sector: %llu pp_size: %u\n", | |
995 | __func__, rdev->raid_disk, i, | |
996 | (unsigned long long)ppl_sector, pp_size); | |
997 | ||
998 | crc = ~0; | |
999 | crc_stored = le32_to_cpu(e->checksum); | |
1000 | ||
1001 | /* read parial parity for this entry and calculate its checksum */ | |
1002 | while (pp_size) { | |
1003 | int s = pp_size > PAGE_SIZE ? PAGE_SIZE : pp_size; | |
1004 | ||
1005 | if (!sync_page_io(rdev, sector - rdev->data_offset, | |
1006 | s, page, REQ_OP_READ, 0, false)) { | |
1007 | md_error(mddev, rdev); | |
1008 | ret = -EIO; | |
1009 | goto out; | |
1010 | } | |
1011 | ||
1012 | crc = crc32c_le(crc, page_address(page), s); | |
1013 | ||
1014 | pp_size -= s; | |
1015 | sector += s >> 9; | |
1016 | } | |
1017 | ||
1018 | crc = ~crc; | |
1019 | ||
1020 | if (crc != crc_stored) { | |
1021 | /* | |
1022 | * Don't recover this entry if the checksum does not | |
1023 | * match, but keep going and try to recover other | |
1024 | * entries. | |
1025 | */ | |
1026 | pr_debug("%s: ppl entry crc does not match: stored: 0x%x calculated: 0x%x\n", | |
1027 | __func__, crc_stored, crc); | |
1028 | ppl_conf->mismatch_count++; | |
1029 | } else { | |
1030 | ret = ppl_recover_entry(log, e, ppl_sector); | |
1031 | if (ret) | |
1032 | goto out; | |
1033 | ppl_conf->recovered_entries++; | |
1034 | } | |
1035 | ||
1036 | ppl_sector += ppl_entry_sectors; | |
1037 | } | |
1038 | ||
1039 | /* flush the disk cache after recovery if necessary */ | |
c6bf3f0e | 1040 | ret = blkdev_issue_flush(rdev->bdev); |
4536bf9b AP |
1041 | out: |
1042 | __free_page(page); | |
1043 | return ret; | |
1044 | } | |
1045 | ||
1046 | static int ppl_write_empty_header(struct ppl_log *log) | |
1047 | { | |
1048 | struct page *page; | |
1049 | struct ppl_header *pplhdr; | |
1050 | struct md_rdev *rdev = log->rdev; | |
1051 | int ret = 0; | |
1052 | ||
1053 | pr_debug("%s: disk: %d ppl_sector: %llu\n", __func__, | |
1054 | rdev->raid_disk, (unsigned long long)rdev->ppl.sector); | |
1055 | ||
1056 | page = alloc_page(GFP_NOIO | __GFP_ZERO); | |
1057 | if (!page) | |
1058 | return -ENOMEM; | |
1059 | ||
1060 | pplhdr = page_address(page); | |
675dc2cc PB |
1061 | /* zero out PPL space to avoid collision with old PPLs */ |
1062 | blkdev_issue_zeroout(rdev->bdev, rdev->ppl.sector, | |
1063 | log->rdev->ppl.size, GFP_NOIO, 0); | |
4536bf9b AP |
1064 | memset(pplhdr->reserved, 0xff, PPL_HDR_RESERVED); |
1065 | pplhdr->signature = cpu_to_le32(log->ppl_conf->signature); | |
1066 | pplhdr->checksum = cpu_to_le32(~crc32c_le(~0, pplhdr, PAGE_SIZE)); | |
1067 | ||
1068 | if (!sync_page_io(rdev, rdev->ppl.sector - rdev->data_offset, | |
5a8948f8 JK |
1069 | PPL_HEADER_SIZE, page, REQ_OP_WRITE | REQ_SYNC | |
1070 | REQ_FUA, 0, false)) { | |
4536bf9b AP |
1071 | md_error(rdev->mddev, rdev); |
1072 | ret = -EIO; | |
1073 | } | |
1074 | ||
1075 | __free_page(page); | |
1076 | return ret; | |
1077 | } | |
1078 | ||
1079 | static int ppl_load_distributed(struct ppl_log *log) | |
1080 | { | |
1081 | struct ppl_conf *ppl_conf = log->ppl_conf; | |
1082 | struct md_rdev *rdev = log->rdev; | |
1083 | struct mddev *mddev = rdev->mddev; | |
675dc2cc PB |
1084 | struct page *page, *page2, *tmp; |
1085 | struct ppl_header *pplhdr = NULL, *prev_pplhdr = NULL; | |
4536bf9b AP |
1086 | u32 crc, crc_stored; |
1087 | u32 signature; | |
675dc2cc PB |
1088 | int ret = 0, i; |
1089 | sector_t pplhdr_offset = 0, prev_pplhdr_offset = 0; | |
4536bf9b AP |
1090 | |
1091 | pr_debug("%s: disk: %d\n", __func__, rdev->raid_disk); | |
675dc2cc | 1092 | /* read PPL headers, find the recent one */ |
4536bf9b AP |
1093 | page = alloc_page(GFP_KERNEL); |
1094 | if (!page) | |
1095 | return -ENOMEM; | |
1096 | ||
675dc2cc PB |
1097 | page2 = alloc_page(GFP_KERNEL); |
1098 | if (!page2) { | |
1099 | __free_page(page); | |
1100 | return -ENOMEM; | |
4536bf9b | 1101 | } |
4536bf9b | 1102 | |
675dc2cc PB |
1103 | /* searching ppl area for latest ppl */ |
1104 | while (pplhdr_offset < rdev->ppl.size - (PPL_HEADER_SIZE >> 9)) { | |
1105 | if (!sync_page_io(rdev, | |
1106 | rdev->ppl.sector - rdev->data_offset + | |
1107 | pplhdr_offset, PAGE_SIZE, page, REQ_OP_READ, | |
1108 | 0, false)) { | |
1109 | md_error(mddev, rdev); | |
1110 | ret = -EIO; | |
1111 | /* if not able to read - don't recover any PPL */ | |
1112 | pplhdr = NULL; | |
1113 | break; | |
1114 | } | |
1115 | pplhdr = page_address(page); | |
1116 | ||
1117 | /* check header validity */ | |
1118 | crc_stored = le32_to_cpu(pplhdr->checksum); | |
1119 | pplhdr->checksum = 0; | |
1120 | crc = ~crc32c_le(~0, pplhdr, PAGE_SIZE); | |
1121 | ||
1122 | if (crc_stored != crc) { | |
1123 | pr_debug("%s: ppl header crc does not match: stored: 0x%x calculated: 0x%x (offset: %llu)\n", | |
1124 | __func__, crc_stored, crc, | |
1125 | (unsigned long long)pplhdr_offset); | |
1126 | pplhdr = prev_pplhdr; | |
1127 | pplhdr_offset = prev_pplhdr_offset; | |
1128 | break; | |
1129 | } | |
4536bf9b | 1130 | |
675dc2cc | 1131 | signature = le32_to_cpu(pplhdr->signature); |
4536bf9b | 1132 | |
675dc2cc PB |
1133 | if (mddev->external) { |
1134 | /* | |
1135 | * For external metadata the header signature is set and | |
1136 | * validated in userspace. | |
1137 | */ | |
1138 | ppl_conf->signature = signature; | |
1139 | } else if (ppl_conf->signature != signature) { | |
1140 | pr_debug("%s: ppl header signature does not match: stored: 0x%x configured: 0x%x (offset: %llu)\n", | |
1141 | __func__, signature, ppl_conf->signature, | |
1142 | (unsigned long long)pplhdr_offset); | |
1143 | pplhdr = prev_pplhdr; | |
1144 | pplhdr_offset = prev_pplhdr_offset; | |
1145 | break; | |
1146 | } | |
4536bf9b | 1147 | |
675dc2cc PB |
1148 | if (prev_pplhdr && le64_to_cpu(prev_pplhdr->generation) > |
1149 | le64_to_cpu(pplhdr->generation)) { | |
1150 | /* previous was newest */ | |
1151 | pplhdr = prev_pplhdr; | |
1152 | pplhdr_offset = prev_pplhdr_offset; | |
1153 | break; | |
1154 | } | |
1155 | ||
1156 | prev_pplhdr_offset = pplhdr_offset; | |
1157 | prev_pplhdr = pplhdr; | |
1158 | ||
1159 | tmp = page; | |
1160 | page = page2; | |
1161 | page2 = tmp; | |
1162 | ||
1163 | /* calculate next potential ppl offset */ | |
1164 | for (i = 0; i < le32_to_cpu(pplhdr->entries_count); i++) | |
1165 | pplhdr_offset += | |
1166 | le32_to_cpu(pplhdr->entries[i].pp_size) >> 9; | |
1167 | pplhdr_offset += PPL_HEADER_SIZE >> 9; | |
4536bf9b AP |
1168 | } |
1169 | ||
675dc2cc PB |
1170 | /* no valid ppl found */ |
1171 | if (!pplhdr) | |
1172 | ppl_conf->mismatch_count++; | |
1173 | else | |
1174 | pr_debug("%s: latest PPL found at offset: %llu, with generation: %llu\n", | |
1175 | __func__, (unsigned long long)pplhdr_offset, | |
1176 | le64_to_cpu(pplhdr->generation)); | |
1177 | ||
4536bf9b | 1178 | /* attempt to recover from log if we are starting a dirty array */ |
675dc2cc PB |
1179 | if (pplhdr && !mddev->pers && mddev->recovery_cp != MaxSector) |
1180 | ret = ppl_recover(log, pplhdr, pplhdr_offset); | |
1181 | ||
4536bf9b AP |
1182 | /* write empty header if we are starting the array */ |
1183 | if (!ret && !mddev->pers) | |
1184 | ret = ppl_write_empty_header(log); | |
1185 | ||
1186 | __free_page(page); | |
675dc2cc | 1187 | __free_page(page2); |
4536bf9b AP |
1188 | |
1189 | pr_debug("%s: return: %d mismatch_count: %d recovered_entries: %d\n", | |
1190 | __func__, ret, ppl_conf->mismatch_count, | |
1191 | ppl_conf->recovered_entries); | |
1192 | return ret; | |
1193 | } | |
1194 | ||
1195 | static int ppl_load(struct ppl_conf *ppl_conf) | |
1196 | { | |
1197 | int ret = 0; | |
1198 | u32 signature = 0; | |
1199 | bool signature_set = false; | |
1200 | int i; | |
1201 | ||
1202 | for (i = 0; i < ppl_conf->count; i++) { | |
1203 | struct ppl_log *log = &ppl_conf->child_logs[i]; | |
1204 | ||
1205 | /* skip missing drive */ | |
1206 | if (!log->rdev) | |
1207 | continue; | |
1208 | ||
1209 | ret = ppl_load_distributed(log); | |
1210 | if (ret) | |
1211 | break; | |
1212 | ||
1213 | /* | |
1214 | * For external metadata we can't check if the signature is | |
1215 | * correct on a single drive, but we can check if it is the same | |
1216 | * on all drives. | |
1217 | */ | |
1218 | if (ppl_conf->mddev->external) { | |
1219 | if (!signature_set) { | |
1220 | signature = ppl_conf->signature; | |
1221 | signature_set = true; | |
1222 | } else if (signature != ppl_conf->signature) { | |
1223 | pr_warn("md/raid:%s: PPL header signature does not match on all member drives\n", | |
1224 | mdname(ppl_conf->mddev)); | |
1225 | ret = -EINVAL; | |
1226 | break; | |
1227 | } | |
1228 | } | |
1229 | } | |
1230 | ||
1231 | pr_debug("%s: return: %d mismatch_count: %d recovered_entries: %d\n", | |
1232 | __func__, ret, ppl_conf->mismatch_count, | |
1233 | ppl_conf->recovered_entries); | |
1234 | return ret; | |
1235 | } | |
1236 | ||
3418d036 AP |
1237 | static void __ppl_exit_log(struct ppl_conf *ppl_conf) |
1238 | { | |
1239 | clear_bit(MD_HAS_PPL, &ppl_conf->mddev->flags); | |
ddc08823 | 1240 | clear_bit(MD_HAS_MULTIPLE_PPLS, &ppl_conf->mddev->flags); |
3418d036 AP |
1241 | |
1242 | kfree(ppl_conf->child_logs); | |
1243 | ||
afeee514 KO |
1244 | bioset_exit(&ppl_conf->bs); |
1245 | bioset_exit(&ppl_conf->flush_bs); | |
1246 | mempool_exit(&ppl_conf->io_pool); | |
3418d036 AP |
1247 | kmem_cache_destroy(ppl_conf->io_kc); |
1248 | ||
1249 | kfree(ppl_conf); | |
1250 | } | |
1251 | ||
1252 | void ppl_exit_log(struct r5conf *conf) | |
1253 | { | |
1254 | struct ppl_conf *ppl_conf = conf->log_private; | |
1255 | ||
1256 | if (ppl_conf) { | |
1257 | __ppl_exit_log(ppl_conf); | |
1258 | conf->log_private = NULL; | |
1259 | } | |
1260 | } | |
1261 | ||
1262 | static int ppl_validate_rdev(struct md_rdev *rdev) | |
1263 | { | |
1264 | char b[BDEVNAME_SIZE]; | |
1265 | int ppl_data_sectors; | |
1266 | int ppl_size_new; | |
1267 | ||
1268 | /* | |
1269 | * The configured PPL size must be enough to store | |
1270 | * the header and (at the very least) partial parity | |
1271 | * for one stripe. Round it down to ensure the data | |
1272 | * space is cleanly divisible by stripe size. | |
1273 | */ | |
1274 | ppl_data_sectors = rdev->ppl.size - (PPL_HEADER_SIZE >> 9); | |
1275 | ||
1276 | if (ppl_data_sectors > 0) | |
c911c46c YY |
1277 | ppl_data_sectors = rounddown(ppl_data_sectors, |
1278 | RAID5_STRIPE_SECTORS((struct r5conf *)rdev->mddev->private)); | |
3418d036 AP |
1279 | |
1280 | if (ppl_data_sectors <= 0) { | |
1281 | pr_warn("md/raid:%s: PPL space too small on %s\n", | |
1282 | mdname(rdev->mddev), bdevname(rdev->bdev, b)); | |
1283 | return -ENOSPC; | |
1284 | } | |
1285 | ||
1286 | ppl_size_new = ppl_data_sectors + (PPL_HEADER_SIZE >> 9); | |
1287 | ||
1288 | if ((rdev->ppl.sector < rdev->data_offset && | |
1289 | rdev->ppl.sector + ppl_size_new > rdev->data_offset) || | |
1290 | (rdev->ppl.sector >= rdev->data_offset && | |
1291 | rdev->data_offset + rdev->sectors > rdev->ppl.sector)) { | |
1292 | pr_warn("md/raid:%s: PPL space overlaps with data on %s\n", | |
1293 | mdname(rdev->mddev), bdevname(rdev->bdev, b)); | |
1294 | return -EINVAL; | |
1295 | } | |
1296 | ||
1297 | if (!rdev->mddev->external && | |
1298 | ((rdev->ppl.offset > 0 && rdev->ppl.offset < (rdev->sb_size >> 9)) || | |
1299 | (rdev->ppl.offset <= 0 && rdev->ppl.offset + ppl_size_new > 0))) { | |
1300 | pr_warn("md/raid:%s: PPL space overlaps with superblock on %s\n", | |
1301 | mdname(rdev->mddev), bdevname(rdev->bdev, b)); | |
1302 | return -EINVAL; | |
1303 | } | |
1304 | ||
1305 | rdev->ppl.size = ppl_size_new; | |
1306 | ||
1307 | return 0; | |
1308 | } | |
1309 | ||
ddc08823 PB |
1310 | static void ppl_init_child_log(struct ppl_log *log, struct md_rdev *rdev) |
1311 | { | |
1532d9e8 TM |
1312 | struct request_queue *q; |
1313 | ||
ddc08823 PB |
1314 | if ((rdev->ppl.size << 9) >= (PPL_SPACE_SIZE + |
1315 | PPL_HEADER_SIZE) * 2) { | |
1316 | log->use_multippl = true; | |
1317 | set_bit(MD_HAS_MULTIPLE_PPLS, | |
1318 | &log->ppl_conf->mddev->flags); | |
1319 | log->entry_space = PPL_SPACE_SIZE; | |
1320 | } else { | |
1321 | log->use_multippl = false; | |
1322 | log->entry_space = (log->rdev->ppl.size << 9) - | |
1323 | PPL_HEADER_SIZE; | |
1324 | } | |
1325 | log->next_io_sector = rdev->ppl.sector; | |
1532d9e8 TM |
1326 | |
1327 | q = bdev_get_queue(rdev->bdev); | |
1328 | if (test_bit(QUEUE_FLAG_WC, &q->queue_flags)) | |
1329 | log->wb_cache_on = true; | |
ddc08823 PB |
1330 | } |
1331 | ||
3418d036 AP |
1332 | int ppl_init_log(struct r5conf *conf) |
1333 | { | |
1334 | struct ppl_conf *ppl_conf; | |
1335 | struct mddev *mddev = conf->mddev; | |
1336 | int ret = 0; | |
1532d9e8 | 1337 | int max_disks; |
3418d036 | 1338 | int i; |
3418d036 AP |
1339 | |
1340 | pr_debug("md/raid:%s: enabling distributed Partial Parity Log\n", | |
1341 | mdname(conf->mddev)); | |
1342 | ||
1343 | if (PAGE_SIZE != 4096) | |
1344 | return -EINVAL; | |
1345 | ||
1346 | if (mddev->level != 5) { | |
1347 | pr_warn("md/raid:%s PPL is not compatible with raid level %d\n", | |
1348 | mdname(mddev), mddev->level); | |
1349 | return -EINVAL; | |
1350 | } | |
1351 | ||
1352 | if (mddev->bitmap_info.file || mddev->bitmap_info.offset) { | |
1353 | pr_warn("md/raid:%s PPL is not compatible with bitmap\n", | |
1354 | mdname(mddev)); | |
1355 | return -EINVAL; | |
1356 | } | |
1357 | ||
1358 | if (test_bit(MD_HAS_JOURNAL, &mddev->flags)) { | |
1359 | pr_warn("md/raid:%s PPL is not compatible with journal\n", | |
1360 | mdname(mddev)); | |
1361 | return -EINVAL; | |
1362 | } | |
1363 | ||
c593642c | 1364 | max_disks = sizeof_field(struct ppl_log, disk_flush_bitmap) * |
1532d9e8 TM |
1365 | BITS_PER_BYTE; |
1366 | if (conf->raid_disks > max_disks) { | |
1367 | pr_warn("md/raid:%s PPL doesn't support over %d disks in the array\n", | |
1368 | mdname(mddev), max_disks); | |
1369 | return -EINVAL; | |
1370 | } | |
1371 | ||
3418d036 AP |
1372 | ppl_conf = kzalloc(sizeof(struct ppl_conf), GFP_KERNEL); |
1373 | if (!ppl_conf) | |
1374 | return -ENOMEM; | |
1375 | ||
1376 | ppl_conf->mddev = mddev; | |
1377 | ||
1378 | ppl_conf->io_kc = KMEM_CACHE(ppl_io_unit, 0); | |
1379 | if (!ppl_conf->io_kc) { | |
fcd403af | 1380 | ret = -ENOMEM; |
3418d036 AP |
1381 | goto err; |
1382 | } | |
1383 | ||
afeee514 KO |
1384 | ret = mempool_init(&ppl_conf->io_pool, conf->raid_disks, ppl_io_pool_alloc, |
1385 | ppl_io_pool_free, ppl_conf->io_kc); | |
1386 | if (ret) | |
3418d036 | 1387 | goto err; |
3418d036 | 1388 | |
afeee514 KO |
1389 | ret = bioset_init(&ppl_conf->bs, conf->raid_disks, 0, BIOSET_NEED_BVECS); |
1390 | if (ret) | |
3418d036 | 1391 | goto err; |
3418d036 | 1392 | |
afeee514 KO |
1393 | ret = bioset_init(&ppl_conf->flush_bs, conf->raid_disks, 0, 0); |
1394 | if (ret) | |
1532d9e8 | 1395 | goto err; |
1532d9e8 | 1396 | |
3418d036 AP |
1397 | ppl_conf->count = conf->raid_disks; |
1398 | ppl_conf->child_logs = kcalloc(ppl_conf->count, sizeof(struct ppl_log), | |
1399 | GFP_KERNEL); | |
1400 | if (!ppl_conf->child_logs) { | |
1401 | ret = -ENOMEM; | |
1402 | goto err; | |
1403 | } | |
1404 | ||
1405 | atomic64_set(&ppl_conf->seq, 0); | |
94568f64 AP |
1406 | INIT_LIST_HEAD(&ppl_conf->no_mem_stripes); |
1407 | spin_lock_init(&ppl_conf->no_mem_stripes_lock); | |
0815ef3c | 1408 | ppl_conf->write_hint = RWH_WRITE_LIFE_NOT_SET; |
3418d036 AP |
1409 | |
1410 | if (!mddev->external) { | |
1411 | ppl_conf->signature = ~crc32c_le(~0, mddev->uuid, sizeof(mddev->uuid)); | |
1412 | ppl_conf->block_size = 512; | |
1413 | } else { | |
1414 | ppl_conf->block_size = queue_logical_block_size(mddev->queue); | |
1415 | } | |
1416 | ||
1417 | for (i = 0; i < ppl_conf->count; i++) { | |
1418 | struct ppl_log *log = &ppl_conf->child_logs[i]; | |
1419 | struct md_rdev *rdev = conf->disks[i].rdev; | |
1420 | ||
1421 | mutex_init(&log->io_mutex); | |
1422 | spin_lock_init(&log->io_list_lock); | |
1423 | INIT_LIST_HEAD(&log->io_list); | |
3418d036 AP |
1424 | |
1425 | log->ppl_conf = ppl_conf; | |
1426 | log->rdev = rdev; | |
1427 | ||
1428 | if (rdev) { | |
3418d036 AP |
1429 | ret = ppl_validate_rdev(rdev); |
1430 | if (ret) | |
1431 | goto err; | |
1432 | ||
ddc08823 | 1433 | ppl_init_child_log(log, rdev); |
3418d036 AP |
1434 | } |
1435 | } | |
1436 | ||
4536bf9b AP |
1437 | /* load and possibly recover the logs from the member disks */ |
1438 | ret = ppl_load(ppl_conf); | |
1439 | ||
1440 | if (ret) { | |
1441 | goto err; | |
611426e2 | 1442 | } else if (!mddev->pers && mddev->recovery_cp == 0 && |
4536bf9b AP |
1443 | ppl_conf->recovered_entries > 0 && |
1444 | ppl_conf->mismatch_count == 0) { | |
1445 | /* | |
1446 | * If we are starting a dirty array and the recovery succeeds | |
1447 | * without any issues, set the array as clean. | |
1448 | */ | |
1449 | mddev->recovery_cp = MaxSector; | |
1450 | set_bit(MD_SB_CHANGE_CLEAN, &mddev->sb_flags); | |
ba903a3e AP |
1451 | } else if (mddev->pers && ppl_conf->mismatch_count > 0) { |
1452 | /* no mismatch allowed when enabling PPL for a running array */ | |
1453 | ret = -EINVAL; | |
1454 | goto err; | |
4536bf9b AP |
1455 | } |
1456 | ||
3418d036 | 1457 | conf->log_private = ppl_conf; |
845b9e22 | 1458 | set_bit(MD_HAS_PPL, &ppl_conf->mddev->flags); |
3418d036 AP |
1459 | |
1460 | return 0; | |
1461 | err: | |
1462 | __ppl_exit_log(ppl_conf); | |
1463 | return ret; | |
1464 | } | |
6358c239 AP |
1465 | |
1466 | int ppl_modify_log(struct r5conf *conf, struct md_rdev *rdev, bool add) | |
1467 | { | |
1468 | struct ppl_conf *ppl_conf = conf->log_private; | |
1469 | struct ppl_log *log; | |
1470 | int ret = 0; | |
1471 | char b[BDEVNAME_SIZE]; | |
1472 | ||
1473 | if (!rdev) | |
1474 | return -EINVAL; | |
1475 | ||
1476 | pr_debug("%s: disk: %d operation: %s dev: %s\n", | |
1477 | __func__, rdev->raid_disk, add ? "add" : "remove", | |
1478 | bdevname(rdev->bdev, b)); | |
1479 | ||
1480 | if (rdev->raid_disk < 0) | |
1481 | return 0; | |
1482 | ||
1483 | if (rdev->raid_disk >= ppl_conf->count) | |
1484 | return -ENODEV; | |
1485 | ||
1486 | log = &ppl_conf->child_logs[rdev->raid_disk]; | |
1487 | ||
1488 | mutex_lock(&log->io_mutex); | |
1489 | if (add) { | |
1490 | ret = ppl_validate_rdev(rdev); | |
1491 | if (!ret) { | |
1492 | log->rdev = rdev; | |
1493 | ret = ppl_write_empty_header(log); | |
ddc08823 | 1494 | ppl_init_child_log(log, rdev); |
6358c239 AP |
1495 | } |
1496 | } else { | |
1497 | log->rdev = NULL; | |
1498 | } | |
1499 | mutex_unlock(&log->io_mutex); | |
1500 | ||
1501 | return ret; | |
1502 | } | |
a596d086 MD |
1503 | |
1504 | static ssize_t | |
1505 | ppl_write_hint_show(struct mddev *mddev, char *buf) | |
1506 | { | |
1507 | size_t ret = 0; | |
1508 | struct r5conf *conf; | |
1509 | struct ppl_conf *ppl_conf = NULL; | |
1510 | ||
1511 | spin_lock(&mddev->lock); | |
1512 | conf = mddev->private; | |
1513 | if (conf && raid5_has_ppl(conf)) | |
1514 | ppl_conf = conf->log_private; | |
1515 | ret = sprintf(buf, "%d\n", ppl_conf ? ppl_conf->write_hint : 0); | |
1516 | spin_unlock(&mddev->lock); | |
1517 | ||
1518 | return ret; | |
1519 | } | |
1520 | ||
1521 | static ssize_t | |
1522 | ppl_write_hint_store(struct mddev *mddev, const char *page, size_t len) | |
1523 | { | |
1524 | struct r5conf *conf; | |
1525 | struct ppl_conf *ppl_conf; | |
1526 | int err = 0; | |
1527 | unsigned short new; | |
1528 | ||
1529 | if (len >= PAGE_SIZE) | |
1530 | return -EINVAL; | |
1531 | if (kstrtou16(page, 10, &new)) | |
1532 | return -EINVAL; | |
1533 | ||
1534 | err = mddev_lock(mddev); | |
1535 | if (err) | |
1536 | return err; | |
1537 | ||
1538 | conf = mddev->private; | |
1539 | if (!conf) { | |
1540 | err = -ENODEV; | |
1541 | } else if (raid5_has_ppl(conf)) { | |
1542 | ppl_conf = conf->log_private; | |
1543 | if (!ppl_conf) | |
1544 | err = -EINVAL; | |
1545 | else | |
1546 | ppl_conf->write_hint = new; | |
1547 | } else { | |
1548 | err = -EINVAL; | |
1549 | } | |
1550 | ||
1551 | mddev_unlock(mddev); | |
1552 | ||
1553 | return err ?: len; | |
1554 | } | |
1555 | ||
1556 | struct md_sysfs_entry | |
1557 | ppl_write_hint = __ATTR(ppl_write_hint, S_IRUGO | S_IWUSR, | |
1558 | ppl_write_hint_show, | |
1559 | ppl_write_hint_store); |