Commit | Line | Data |
---|---|---|
cafe5635 KO |
1 | /* |
2 | * bcache setup/teardown code, and some metadata io - read a superblock and | |
3 | * figure out what to do with it. | |
4 | * | |
5 | * Copyright 2010, 2011 Kent Overstreet <kent.overstreet@gmail.com> | |
6 | * Copyright 2012 Google, Inc. | |
7 | */ | |
8 | ||
9 | #include "bcache.h" | |
10 | #include "btree.h" | |
11 | #include "debug.h" | |
65d45231 | 12 | #include "extents.h" |
cafe5635 | 13 | #include "request.h" |
279afbad | 14 | #include "writeback.h" |
cafe5635 | 15 | |
c37511b8 | 16 | #include <linux/blkdev.h> |
cafe5635 KO |
17 | #include <linux/buffer_head.h> |
18 | #include <linux/debugfs.h> | |
19 | #include <linux/genhd.h> | |
28935ab5 | 20 | #include <linux/idr.h> |
79826c35 | 21 | #include <linux/kthread.h> |
cafe5635 KO |
22 | #include <linux/module.h> |
23 | #include <linux/random.h> | |
24 | #include <linux/reboot.h> | |
25 | #include <linux/sysfs.h> | |
26 | ||
27 | MODULE_LICENSE("GPL"); | |
28 | MODULE_AUTHOR("Kent Overstreet <kent.overstreet@gmail.com>"); | |
29 | ||
30 | static const char bcache_magic[] = { | |
31 | 0xc6, 0x85, 0x73, 0xf6, 0x4e, 0x1a, 0x45, 0xca, | |
32 | 0x82, 0x65, 0xf5, 0x7f, 0x48, 0xba, 0x6d, 0x81 | |
33 | }; | |
34 | ||
35 | static const char invalid_uuid[] = { | |
36 | 0xa0, 0x3e, 0xf8, 0xed, 0x3e, 0xe1, 0xb8, 0x78, | |
37 | 0xc8, 0x50, 0xfc, 0x5e, 0xcb, 0x16, 0xcd, 0x99 | |
38 | }; | |
39 | ||
40 | /* Default is -1; we skip past it for struct cached_dev's cache mode */ | |
41 | const char * const bch_cache_modes[] = { | |
42 | "default", | |
43 | "writethrough", | |
44 | "writeback", | |
45 | "writearound", | |
46 | "none", | |
47 | NULL | |
48 | }; | |
49 | ||
7e027ca4 CL |
50 | /* Default is -1; we skip past it for stop_when_cache_set_failed */ |
51 | const char * const bch_stop_on_failure_modes[] = { | |
52 | "default", | |
53 | "auto", | |
54 | "always", | |
55 | NULL | |
56 | }; | |
57 | ||
cafe5635 KO |
58 | static struct kobject *bcache_kobj; |
59 | struct mutex bch_register_lock; | |
60 | LIST_HEAD(bch_cache_sets); | |
61 | static LIST_HEAD(uncached_devices); | |
62 | ||
28935ab5 | 63 | static int bcache_major; |
1dbe32ad | 64 | static DEFINE_IDA(bcache_device_idx); |
cafe5635 KO |
65 | static wait_queue_head_t unregister_wait; |
66 | struct workqueue_struct *bcache_wq; | |
67 | ||
68 | #define BTREE_MAX_PAGES (256 * 1024 / PAGE_SIZE) | |
1dbe32ad CL |
69 | /* limitation of partitions number on single bcache device */ |
70 | #define BCACHE_MINORS 128 | |
71 | /* limitation of bcache devices number on single system */ | |
72 | #define BCACHE_DEVICE_IDX_MAX ((1U << MINORBITS)/BCACHE_MINORS) | |
cafe5635 | 73 | |
cafe5635 KO |
74 | /* Superblock */ |
75 | ||
76 | static const char *read_super(struct cache_sb *sb, struct block_device *bdev, | |
77 | struct page **res) | |
78 | { | |
79 | const char *err; | |
80 | struct cache_sb *s; | |
81 | struct buffer_head *bh = __bread(bdev, 1, SB_SIZE); | |
82 | unsigned i; | |
83 | ||
84 | if (!bh) | |
85 | return "IO error"; | |
86 | ||
87 | s = (struct cache_sb *) bh->b_data; | |
88 | ||
89 | sb->offset = le64_to_cpu(s->offset); | |
90 | sb->version = le64_to_cpu(s->version); | |
91 | ||
92 | memcpy(sb->magic, s->magic, 16); | |
93 | memcpy(sb->uuid, s->uuid, 16); | |
94 | memcpy(sb->set_uuid, s->set_uuid, 16); | |
95 | memcpy(sb->label, s->label, SB_LABEL_SIZE); | |
96 | ||
97 | sb->flags = le64_to_cpu(s->flags); | |
98 | sb->seq = le64_to_cpu(s->seq); | |
cafe5635 | 99 | sb->last_mount = le32_to_cpu(s->last_mount); |
cafe5635 KO |
100 | sb->first_bucket = le16_to_cpu(s->first_bucket); |
101 | sb->keys = le16_to_cpu(s->keys); | |
102 | ||
103 | for (i = 0; i < SB_JOURNAL_BUCKETS; i++) | |
104 | sb->d[i] = le64_to_cpu(s->d[i]); | |
105 | ||
106 | pr_debug("read sb version %llu, flags %llu, seq %llu, journal size %u", | |
107 | sb->version, sb->flags, sb->seq, sb->keys); | |
108 | ||
109 | err = "Not a bcache superblock"; | |
110 | if (sb->offset != SB_SECTOR) | |
111 | goto err; | |
112 | ||
113 | if (memcmp(sb->magic, bcache_magic, 16)) | |
114 | goto err; | |
115 | ||
116 | err = "Too many journal buckets"; | |
117 | if (sb->keys > SB_JOURNAL_BUCKETS) | |
118 | goto err; | |
119 | ||
120 | err = "Bad checksum"; | |
121 | if (s->csum != csum_set(s)) | |
122 | goto err; | |
123 | ||
124 | err = "Bad UUID"; | |
169ef1cf | 125 | if (bch_is_zero(sb->uuid, 16)) |
cafe5635 KO |
126 | goto err; |
127 | ||
8abb2a5d KO |
128 | sb->block_size = le16_to_cpu(s->block_size); |
129 | ||
130 | err = "Superblock block size smaller than device block size"; | |
131 | if (sb->block_size << 9 < bdev_logical_block_size(bdev)) | |
132 | goto err; | |
133 | ||
2903381f KO |
134 | switch (sb->version) { |
135 | case BCACHE_SB_VERSION_BDEV: | |
2903381f KO |
136 | sb->data_offset = BDEV_DATA_START_DEFAULT; |
137 | break; | |
138 | case BCACHE_SB_VERSION_BDEV_WITH_OFFSET: | |
2903381f KO |
139 | sb->data_offset = le64_to_cpu(s->data_offset); |
140 | ||
141 | err = "Bad data offset"; | |
142 | if (sb->data_offset < BDEV_DATA_START_DEFAULT) | |
143 | goto err; | |
cafe5635 | 144 | |
2903381f KO |
145 | break; |
146 | case BCACHE_SB_VERSION_CDEV: | |
147 | case BCACHE_SB_VERSION_CDEV_WITH_UUID: | |
148 | sb->nbuckets = le64_to_cpu(s->nbuckets); | |
2903381f | 149 | sb->bucket_size = le16_to_cpu(s->bucket_size); |
cafe5635 | 150 | |
2903381f KO |
151 | sb->nr_in_set = le16_to_cpu(s->nr_in_set); |
152 | sb->nr_this_dev = le16_to_cpu(s->nr_this_dev); | |
cafe5635 | 153 | |
2903381f KO |
154 | err = "Too many buckets"; |
155 | if (sb->nbuckets > LONG_MAX) | |
156 | goto err; | |
cafe5635 | 157 | |
2903381f KO |
158 | err = "Not enough buckets"; |
159 | if (sb->nbuckets < 1 << 7) | |
160 | goto err; | |
cafe5635 | 161 | |
2903381f KO |
162 | err = "Bad block/bucket size"; |
163 | if (!is_power_of_2(sb->block_size) || | |
164 | sb->block_size > PAGE_SECTORS || | |
165 | !is_power_of_2(sb->bucket_size) || | |
166 | sb->bucket_size < PAGE_SECTORS) | |
167 | goto err; | |
cafe5635 | 168 | |
2903381f KO |
169 | err = "Invalid superblock: device too small"; |
170 | if (get_capacity(bdev->bd_disk) < sb->bucket_size * sb->nbuckets) | |
171 | goto err; | |
cafe5635 | 172 | |
2903381f KO |
173 | err = "Bad UUID"; |
174 | if (bch_is_zero(sb->set_uuid, 16)) | |
175 | goto err; | |
cafe5635 | 176 | |
2903381f KO |
177 | err = "Bad cache device number in set"; |
178 | if (!sb->nr_in_set || | |
179 | sb->nr_in_set <= sb->nr_this_dev || | |
180 | sb->nr_in_set > MAX_CACHES_PER_SET) | |
cafe5635 KO |
181 | goto err; |
182 | ||
2903381f KO |
183 | err = "Journal buckets not sequential"; |
184 | for (i = 0; i < sb->keys; i++) | |
185 | if (sb->d[i] != sb->first_bucket + i) | |
186 | goto err; | |
cafe5635 | 187 | |
2903381f KO |
188 | err = "Too many journal buckets"; |
189 | if (sb->first_bucket + sb->keys > sb->nbuckets) | |
190 | goto err; | |
191 | ||
192 | err = "Invalid superblock: first bucket comes before end of super"; | |
193 | if (sb->first_bucket * sb->bucket_size < 16) | |
194 | goto err; | |
195 | ||
196 | break; | |
197 | default: | |
198 | err = "Unsupported superblock version"; | |
cafe5635 | 199 | goto err; |
2903381f KO |
200 | } |
201 | ||
cafe5635 KO |
202 | sb->last_mount = get_seconds(); |
203 | err = NULL; | |
204 | ||
205 | get_page(bh->b_page); | |
206 | *res = bh->b_page; | |
207 | err: | |
208 | put_bh(bh); | |
209 | return err; | |
210 | } | |
211 | ||
4246a0b6 | 212 | static void write_bdev_super_endio(struct bio *bio) |
cafe5635 KO |
213 | { |
214 | struct cached_dev *dc = bio->bi_private; | |
215 | /* XXX: error checking */ | |
216 | ||
cb7a583e | 217 | closure_put(&dc->sb_write); |
cafe5635 KO |
218 | } |
219 | ||
220 | static void __write_super(struct cache_sb *sb, struct bio *bio) | |
221 | { | |
263663cd | 222 | struct cache_sb *out = page_address(bio_first_page_all(bio)); |
cafe5635 KO |
223 | unsigned i; |
224 | ||
4f024f37 | 225 | bio->bi_iter.bi_sector = SB_SECTOR; |
4f024f37 | 226 | bio->bi_iter.bi_size = SB_SIZE; |
ad0d9e76 | 227 | bio_set_op_attrs(bio, REQ_OP_WRITE, REQ_SYNC|REQ_META); |
169ef1cf | 228 | bch_bio_map(bio, NULL); |
cafe5635 KO |
229 | |
230 | out->offset = cpu_to_le64(sb->offset); | |
231 | out->version = cpu_to_le64(sb->version); | |
232 | ||
233 | memcpy(out->uuid, sb->uuid, 16); | |
234 | memcpy(out->set_uuid, sb->set_uuid, 16); | |
235 | memcpy(out->label, sb->label, SB_LABEL_SIZE); | |
236 | ||
237 | out->flags = cpu_to_le64(sb->flags); | |
238 | out->seq = cpu_to_le64(sb->seq); | |
239 | ||
240 | out->last_mount = cpu_to_le32(sb->last_mount); | |
241 | out->first_bucket = cpu_to_le16(sb->first_bucket); | |
242 | out->keys = cpu_to_le16(sb->keys); | |
243 | ||
244 | for (i = 0; i < sb->keys; i++) | |
245 | out->d[i] = cpu_to_le64(sb->d[i]); | |
246 | ||
247 | out->csum = csum_set(out); | |
248 | ||
249 | pr_debug("ver %llu, flags %llu, seq %llu", | |
250 | sb->version, sb->flags, sb->seq); | |
251 | ||
4e49ea4a | 252 | submit_bio(bio); |
cafe5635 KO |
253 | } |
254 | ||
cb7a583e KO |
255 | static void bch_write_bdev_super_unlock(struct closure *cl) |
256 | { | |
257 | struct cached_dev *dc = container_of(cl, struct cached_dev, sb_write); | |
258 | ||
259 | up(&dc->sb_write_mutex); | |
260 | } | |
261 | ||
cafe5635 KO |
262 | void bch_write_bdev_super(struct cached_dev *dc, struct closure *parent) |
263 | { | |
cb7a583e | 264 | struct closure *cl = &dc->sb_write; |
cafe5635 KO |
265 | struct bio *bio = &dc->sb_bio; |
266 | ||
cb7a583e KO |
267 | down(&dc->sb_write_mutex); |
268 | closure_init(cl, parent); | |
cafe5635 KO |
269 | |
270 | bio_reset(bio); | |
74d46992 | 271 | bio_set_dev(bio, dc->bdev); |
cafe5635 KO |
272 | bio->bi_end_io = write_bdev_super_endio; |
273 | bio->bi_private = dc; | |
274 | ||
275 | closure_get(cl); | |
27a40ab9 | 276 | /* I/O request sent to backing device */ |
cafe5635 KO |
277 | __write_super(&dc->sb, bio); |
278 | ||
cb7a583e | 279 | closure_return_with_destructor(cl, bch_write_bdev_super_unlock); |
cafe5635 KO |
280 | } |
281 | ||
4246a0b6 | 282 | static void write_super_endio(struct bio *bio) |
cafe5635 KO |
283 | { |
284 | struct cache *ca = bio->bi_private; | |
285 | ||
5138ac67 CL |
286 | /* is_read = 0 */ |
287 | bch_count_io_errors(ca, bio->bi_status, 0, | |
288 | "writing superblock"); | |
cb7a583e KO |
289 | closure_put(&ca->set->sb_write); |
290 | } | |
291 | ||
292 | static void bcache_write_super_unlock(struct closure *cl) | |
293 | { | |
294 | struct cache_set *c = container_of(cl, struct cache_set, sb_write); | |
295 | ||
296 | up(&c->sb_write_mutex); | |
cafe5635 KO |
297 | } |
298 | ||
299 | void bcache_write_super(struct cache_set *c) | |
300 | { | |
cb7a583e | 301 | struct closure *cl = &c->sb_write; |
cafe5635 KO |
302 | struct cache *ca; |
303 | unsigned i; | |
304 | ||
cb7a583e KO |
305 | down(&c->sb_write_mutex); |
306 | closure_init(cl, &c->cl); | |
cafe5635 KO |
307 | |
308 | c->sb.seq++; | |
309 | ||
310 | for_each_cache(ca, c, i) { | |
311 | struct bio *bio = &ca->sb_bio; | |
312 | ||
2903381f | 313 | ca->sb.version = BCACHE_SB_VERSION_CDEV_WITH_UUID; |
cafe5635 KO |
314 | ca->sb.seq = c->sb.seq; |
315 | ca->sb.last_mount = c->sb.last_mount; | |
316 | ||
317 | SET_CACHE_SYNC(&ca->sb, CACHE_SYNC(&c->sb)); | |
318 | ||
319 | bio_reset(bio); | |
74d46992 | 320 | bio_set_dev(bio, ca->bdev); |
cafe5635 KO |
321 | bio->bi_end_io = write_super_endio; |
322 | bio->bi_private = ca; | |
323 | ||
324 | closure_get(cl); | |
325 | __write_super(&ca->sb, bio); | |
326 | } | |
327 | ||
cb7a583e | 328 | closure_return_with_destructor(cl, bcache_write_super_unlock); |
cafe5635 KO |
329 | } |
330 | ||
331 | /* UUID io */ | |
332 | ||
4246a0b6 | 333 | static void uuid_endio(struct bio *bio) |
cafe5635 KO |
334 | { |
335 | struct closure *cl = bio->bi_private; | |
cb7a583e | 336 | struct cache_set *c = container_of(cl, struct cache_set, uuid_write); |
cafe5635 | 337 | |
4e4cbee9 | 338 | cache_set_err_on(bio->bi_status, c, "accessing uuids"); |
cafe5635 KO |
339 | bch_bbio_free(bio, c); |
340 | closure_put(cl); | |
341 | } | |
342 | ||
cb7a583e KO |
343 | static void uuid_io_unlock(struct closure *cl) |
344 | { | |
345 | struct cache_set *c = container_of(cl, struct cache_set, uuid_write); | |
346 | ||
347 | up(&c->uuid_write_mutex); | |
348 | } | |
349 | ||
ad0d9e76 | 350 | static void uuid_io(struct cache_set *c, int op, unsigned long op_flags, |
cafe5635 KO |
351 | struct bkey *k, struct closure *parent) |
352 | { | |
cb7a583e | 353 | struct closure *cl = &c->uuid_write; |
cafe5635 KO |
354 | struct uuid_entry *u; |
355 | unsigned i; | |
85b1492e | 356 | char buf[80]; |
cafe5635 KO |
357 | |
358 | BUG_ON(!parent); | |
cb7a583e KO |
359 | down(&c->uuid_write_mutex); |
360 | closure_init(cl, parent); | |
cafe5635 KO |
361 | |
362 | for (i = 0; i < KEY_PTRS(k); i++) { | |
363 | struct bio *bio = bch_bbio_alloc(c); | |
364 | ||
1eff9d32 | 365 | bio->bi_opf = REQ_SYNC | REQ_META | op_flags; |
4f024f37 | 366 | bio->bi_iter.bi_size = KEY_SIZE(k) << 9; |
cafe5635 KO |
367 | |
368 | bio->bi_end_io = uuid_endio; | |
369 | bio->bi_private = cl; | |
ad0d9e76 | 370 | bio_set_op_attrs(bio, op, REQ_SYNC|REQ_META|op_flags); |
169ef1cf | 371 | bch_bio_map(bio, c->uuids); |
cafe5635 KO |
372 | |
373 | bch_submit_bbio(bio, c, k, i); | |
374 | ||
ad0d9e76 | 375 | if (op != REQ_OP_WRITE) |
cafe5635 KO |
376 | break; |
377 | } | |
378 | ||
dc9d98d6 | 379 | bch_extent_to_text(buf, sizeof(buf), k); |
ad0d9e76 | 380 | pr_debug("%s UUIDs at %s", op == REQ_OP_WRITE ? "wrote" : "read", buf); |
cafe5635 KO |
381 | |
382 | for (u = c->uuids; u < c->uuids + c->nr_uuids; u++) | |
169ef1cf | 383 | if (!bch_is_zero(u->uuid, 16)) |
cafe5635 KO |
384 | pr_debug("Slot %zi: %pU: %s: 1st: %u last: %u inv: %u", |
385 | u - c->uuids, u->uuid, u->label, | |
386 | u->first_reg, u->last_reg, u->invalidated); | |
387 | ||
cb7a583e | 388 | closure_return_with_destructor(cl, uuid_io_unlock); |
cafe5635 KO |
389 | } |
390 | ||
391 | static char *uuid_read(struct cache_set *c, struct jset *j, struct closure *cl) | |
392 | { | |
393 | struct bkey *k = &j->uuid_bucket; | |
394 | ||
65d45231 | 395 | if (__bch_btree_ptr_invalid(c, k)) |
cafe5635 KO |
396 | return "bad uuid pointer"; |
397 | ||
398 | bkey_copy(&c->uuid_bucket, k); | |
70fd7614 | 399 | uuid_io(c, REQ_OP_READ, 0, k, cl); |
cafe5635 KO |
400 | |
401 | if (j->version < BCACHE_JSET_VERSION_UUIDv1) { | |
402 | struct uuid_entry_v0 *u0 = (void *) c->uuids; | |
403 | struct uuid_entry *u1 = (void *) c->uuids; | |
404 | int i; | |
405 | ||
406 | closure_sync(cl); | |
407 | ||
408 | /* | |
409 | * Since the new uuid entry is bigger than the old, we have to | |
410 | * convert starting at the highest memory address and work down | |
411 | * in order to do it in place | |
412 | */ | |
413 | ||
414 | for (i = c->nr_uuids - 1; | |
415 | i >= 0; | |
416 | --i) { | |
417 | memcpy(u1[i].uuid, u0[i].uuid, 16); | |
418 | memcpy(u1[i].label, u0[i].label, 32); | |
419 | ||
420 | u1[i].first_reg = u0[i].first_reg; | |
421 | u1[i].last_reg = u0[i].last_reg; | |
422 | u1[i].invalidated = u0[i].invalidated; | |
423 | ||
424 | u1[i].flags = 0; | |
425 | u1[i].sectors = 0; | |
426 | } | |
427 | } | |
428 | ||
429 | return NULL; | |
430 | } | |
431 | ||
432 | static int __uuid_write(struct cache_set *c) | |
433 | { | |
434 | BKEY_PADDED(key) k; | |
435 | struct closure cl; | |
436 | closure_init_stack(&cl); | |
437 | ||
438 | lockdep_assert_held(&bch_register_lock); | |
439 | ||
78365411 | 440 | if (bch_bucket_alloc_set(c, RESERVE_BTREE, &k.key, 1, true)) |
cafe5635 KO |
441 | return 1; |
442 | ||
443 | SET_KEY_SIZE(&k.key, c->sb.bucket_size); | |
ad0d9e76 | 444 | uuid_io(c, REQ_OP_WRITE, 0, &k.key, &cl); |
cafe5635 KO |
445 | closure_sync(&cl); |
446 | ||
447 | bkey_copy(&c->uuid_bucket, &k.key); | |
3a3b6a4e | 448 | bkey_put(c, &k.key); |
cafe5635 KO |
449 | return 0; |
450 | } | |
451 | ||
452 | int bch_uuid_write(struct cache_set *c) | |
453 | { | |
454 | int ret = __uuid_write(c); | |
455 | ||
456 | if (!ret) | |
457 | bch_journal_meta(c, NULL); | |
458 | ||
459 | return ret; | |
460 | } | |
461 | ||
462 | static struct uuid_entry *uuid_find(struct cache_set *c, const char *uuid) | |
463 | { | |
464 | struct uuid_entry *u; | |
465 | ||
466 | for (u = c->uuids; | |
467 | u < c->uuids + c->nr_uuids; u++) | |
468 | if (!memcmp(u->uuid, uuid, 16)) | |
469 | return u; | |
470 | ||
471 | return NULL; | |
472 | } | |
473 | ||
474 | static struct uuid_entry *uuid_find_empty(struct cache_set *c) | |
475 | { | |
476 | static const char zero_uuid[16] = "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"; | |
477 | return uuid_find(c, zero_uuid); | |
478 | } | |
479 | ||
480 | /* | |
481 | * Bucket priorities/gens: | |
482 | * | |
483 | * For each bucket, we store on disk its | |
484 | * 8 bit gen | |
485 | * 16 bit priority | |
486 | * | |
487 | * See alloc.c for an explanation of the gen. The priority is used to implement | |
488 | * lru (and in the future other) cache replacement policies; for most purposes | |
489 | * it's just an opaque integer. | |
490 | * | |
491 | * The gens and the priorities don't have a whole lot to do with each other, and | |
492 | * it's actually the gens that must be written out at specific times - it's no | |
493 | * big deal if the priorities don't get written, if we lose them we just reuse | |
494 | * buckets in suboptimal order. | |
495 | * | |
496 | * On disk they're stored in a packed array, and in as many buckets are required | |
497 | * to fit them all. The buckets we use to store them form a list; the journal | |
498 | * header points to the first bucket, the first bucket points to the second | |
499 | * bucket, et cetera. | |
500 | * | |
501 | * This code is used by the allocation code; periodically (whenever it runs out | |
502 | * of buckets to allocate from) the allocation code will invalidate some | |
503 | * buckets, but it can't use those buckets until their new gens are safely on | |
504 | * disk. | |
505 | */ | |
506 | ||
4246a0b6 | 507 | static void prio_endio(struct bio *bio) |
cafe5635 KO |
508 | { |
509 | struct cache *ca = bio->bi_private; | |
510 | ||
4e4cbee9 | 511 | cache_set_err_on(bio->bi_status, ca->set, "accessing priorities"); |
cafe5635 KO |
512 | bch_bbio_free(bio, ca->set); |
513 | closure_put(&ca->prio); | |
514 | } | |
515 | ||
ad0d9e76 MC |
516 | static void prio_io(struct cache *ca, uint64_t bucket, int op, |
517 | unsigned long op_flags) | |
cafe5635 KO |
518 | { |
519 | struct closure *cl = &ca->prio; | |
520 | struct bio *bio = bch_bbio_alloc(ca->set); | |
521 | ||
522 | closure_init_stack(cl); | |
523 | ||
4f024f37 | 524 | bio->bi_iter.bi_sector = bucket * ca->sb.bucket_size; |
74d46992 | 525 | bio_set_dev(bio, ca->bdev); |
4f024f37 | 526 | bio->bi_iter.bi_size = bucket_bytes(ca); |
cafe5635 KO |
527 | |
528 | bio->bi_end_io = prio_endio; | |
529 | bio->bi_private = ca; | |
ad0d9e76 | 530 | bio_set_op_attrs(bio, op, REQ_SYNC|REQ_META|op_flags); |
169ef1cf | 531 | bch_bio_map(bio, ca->disk_buckets); |
cafe5635 | 532 | |
771f393e | 533 | closure_bio_submit(ca->set, bio, &ca->prio); |
cafe5635 KO |
534 | closure_sync(cl); |
535 | } | |
536 | ||
cafe5635 KO |
537 | void bch_prio_write(struct cache *ca) |
538 | { | |
539 | int i; | |
540 | struct bucket *b; | |
541 | struct closure cl; | |
542 | ||
543 | closure_init_stack(&cl); | |
544 | ||
545 | lockdep_assert_held(&ca->set->bucket_lock); | |
546 | ||
cafe5635 KO |
547 | ca->disk_buckets->seq++; |
548 | ||
549 | atomic_long_add(ca->sb.bucket_size * prio_buckets(ca), | |
550 | &ca->meta_sectors_written); | |
551 | ||
78365411 KO |
552 | //pr_debug("free %zu, free_inc %zu, unused %zu", fifo_used(&ca->free), |
553 | // fifo_used(&ca->free_inc), fifo_used(&ca->unused)); | |
cafe5635 KO |
554 | |
555 | for (i = prio_buckets(ca) - 1; i >= 0; --i) { | |
556 | long bucket; | |
557 | struct prio_set *p = ca->disk_buckets; | |
b1a67b0f KO |
558 | struct bucket_disk *d = p->data; |
559 | struct bucket_disk *end = d + prios_per_bucket(ca); | |
cafe5635 KO |
560 | |
561 | for (b = ca->buckets + i * prios_per_bucket(ca); | |
562 | b < ca->buckets + ca->sb.nbuckets && d < end; | |
563 | b++, d++) { | |
564 | d->prio = cpu_to_le16(b->prio); | |
565 | d->gen = b->gen; | |
566 | } | |
567 | ||
568 | p->next_bucket = ca->prio_buckets[i + 1]; | |
81ab4190 | 569 | p->magic = pset_magic(&ca->sb); |
169ef1cf | 570 | p->csum = bch_crc64(&p->magic, bucket_bytes(ca) - 8); |
cafe5635 | 571 | |
78365411 | 572 | bucket = bch_bucket_alloc(ca, RESERVE_PRIO, true); |
cafe5635 KO |
573 | BUG_ON(bucket == -1); |
574 | ||
575 | mutex_unlock(&ca->set->bucket_lock); | |
ad0d9e76 | 576 | prio_io(ca, bucket, REQ_OP_WRITE, 0); |
cafe5635 KO |
577 | mutex_lock(&ca->set->bucket_lock); |
578 | ||
579 | ca->prio_buckets[i] = bucket; | |
580 | atomic_dec_bug(&ca->buckets[bucket].pin); | |
581 | } | |
582 | ||
583 | mutex_unlock(&ca->set->bucket_lock); | |
584 | ||
585 | bch_journal_meta(ca->set, &cl); | |
586 | closure_sync(&cl); | |
587 | ||
588 | mutex_lock(&ca->set->bucket_lock); | |
589 | ||
cafe5635 KO |
590 | /* |
591 | * Don't want the old priorities to get garbage collected until after we | |
592 | * finish writing the new ones, and they're journalled | |
593 | */ | |
2531d9ee KO |
594 | for (i = 0; i < prio_buckets(ca); i++) { |
595 | if (ca->prio_last_buckets[i]) | |
596 | __bch_bucket_free(ca, | |
597 | &ca->buckets[ca->prio_last_buckets[i]]); | |
598 | ||
cafe5635 | 599 | ca->prio_last_buckets[i] = ca->prio_buckets[i]; |
2531d9ee | 600 | } |
cafe5635 KO |
601 | } |
602 | ||
603 | static void prio_read(struct cache *ca, uint64_t bucket) | |
604 | { | |
605 | struct prio_set *p = ca->disk_buckets; | |
606 | struct bucket_disk *d = p->data + prios_per_bucket(ca), *end = d; | |
607 | struct bucket *b; | |
608 | unsigned bucket_nr = 0; | |
609 | ||
610 | for (b = ca->buckets; | |
611 | b < ca->buckets + ca->sb.nbuckets; | |
612 | b++, d++) { | |
613 | if (d == end) { | |
614 | ca->prio_buckets[bucket_nr] = bucket; | |
615 | ca->prio_last_buckets[bucket_nr] = bucket; | |
616 | bucket_nr++; | |
617 | ||
70fd7614 | 618 | prio_io(ca, bucket, REQ_OP_READ, 0); |
cafe5635 | 619 | |
169ef1cf | 620 | if (p->csum != bch_crc64(&p->magic, bucket_bytes(ca) - 8)) |
cafe5635 KO |
621 | pr_warn("bad csum reading priorities"); |
622 | ||
81ab4190 | 623 | if (p->magic != pset_magic(&ca->sb)) |
cafe5635 KO |
624 | pr_warn("bad magic reading priorities"); |
625 | ||
626 | bucket = p->next_bucket; | |
627 | d = p->data; | |
628 | } | |
629 | ||
630 | b->prio = le16_to_cpu(d->prio); | |
3a2fd9d5 | 631 | b->gen = b->last_gc = d->gen; |
cafe5635 KO |
632 | } |
633 | } | |
634 | ||
635 | /* Bcache device */ | |
636 | ||
637 | static int open_dev(struct block_device *b, fmode_t mode) | |
638 | { | |
639 | struct bcache_device *d = b->bd_disk->private_data; | |
c4d951dd | 640 | if (test_bit(BCACHE_DEV_CLOSING, &d->flags)) |
cafe5635 KO |
641 | return -ENXIO; |
642 | ||
643 | closure_get(&d->cl); | |
644 | return 0; | |
645 | } | |
646 | ||
867e1162 | 647 | static void release_dev(struct gendisk *b, fmode_t mode) |
cafe5635 KO |
648 | { |
649 | struct bcache_device *d = b->private_data; | |
650 | closure_put(&d->cl); | |
cafe5635 KO |
651 | } |
652 | ||
653 | static int ioctl_dev(struct block_device *b, fmode_t mode, | |
654 | unsigned int cmd, unsigned long arg) | |
655 | { | |
656 | struct bcache_device *d = b->bd_disk->private_data; | |
657 | return d->ioctl(d, mode, cmd, arg); | |
658 | } | |
659 | ||
660 | static const struct block_device_operations bcache_ops = { | |
661 | .open = open_dev, | |
662 | .release = release_dev, | |
663 | .ioctl = ioctl_dev, | |
664 | .owner = THIS_MODULE, | |
665 | }; | |
666 | ||
667 | void bcache_device_stop(struct bcache_device *d) | |
668 | { | |
c4d951dd | 669 | if (!test_and_set_bit(BCACHE_DEV_CLOSING, &d->flags)) |
cafe5635 KO |
670 | closure_queue(&d->cl); |
671 | } | |
672 | ||
ee668506 KO |
673 | static void bcache_device_unlink(struct bcache_device *d) |
674 | { | |
c4d951dd | 675 | lockdep_assert_held(&bch_register_lock); |
ee668506 | 676 | |
c4d951dd KO |
677 | if (d->c && !test_and_set_bit(BCACHE_DEV_UNLINK_DONE, &d->flags)) { |
678 | unsigned i; | |
679 | struct cache *ca; | |
ee668506 | 680 | |
c4d951dd KO |
681 | sysfs_remove_link(&d->c->kobj, d->name); |
682 | sysfs_remove_link(&d->kobj, "cache"); | |
683 | ||
684 | for_each_cache(ca, d->c, i) | |
685 | bd_unlink_disk_holder(ca->bdev, d->disk); | |
686 | } | |
ee668506 KO |
687 | } |
688 | ||
689 | static void bcache_device_link(struct bcache_device *d, struct cache_set *c, | |
690 | const char *name) | |
691 | { | |
692 | unsigned i; | |
693 | struct cache *ca; | |
694 | ||
695 | for_each_cache(ca, d->c, i) | |
696 | bd_link_disk_holder(ca->bdev, d->disk); | |
697 | ||
698 | snprintf(d->name, BCACHEDEVNAME_SIZE, | |
699 | "%s%u", name, d->id); | |
700 | ||
701 | WARN(sysfs_create_link(&d->kobj, &c->kobj, "cache") || | |
702 | sysfs_create_link(&c->kobj, &d->kobj, d->name), | |
703 | "Couldn't create device <-> cache set symlinks"); | |
fecaee6f ZL |
704 | |
705 | clear_bit(BCACHE_DEV_UNLINK_DONE, &d->flags); | |
ee668506 KO |
706 | } |
707 | ||
cafe5635 KO |
708 | static void bcache_device_detach(struct bcache_device *d) |
709 | { | |
710 | lockdep_assert_held(&bch_register_lock); | |
711 | ||
c4d951dd | 712 | if (test_bit(BCACHE_DEV_DETACHING, &d->flags)) { |
cafe5635 KO |
713 | struct uuid_entry *u = d->c->uuids + d->id; |
714 | ||
715 | SET_UUID_FLASH_ONLY(u, 0); | |
716 | memcpy(u->uuid, invalid_uuid, 16); | |
717 | u->invalidated = cpu_to_le32(get_seconds()); | |
718 | bch_uuid_write(d->c); | |
cafe5635 KO |
719 | } |
720 | ||
c4d951dd | 721 | bcache_device_unlink(d); |
ee668506 | 722 | |
cafe5635 KO |
723 | d->c->devices[d->id] = NULL; |
724 | closure_put(&d->c->caching); | |
725 | d->c = NULL; | |
726 | } | |
727 | ||
728 | static void bcache_device_attach(struct bcache_device *d, struct cache_set *c, | |
729 | unsigned id) | |
730 | { | |
cafe5635 KO |
731 | d->id = id; |
732 | d->c = c; | |
733 | c->devices[id] = d; | |
734 | ||
2831231d CL |
735 | if (id >= c->devices_max_used) |
736 | c->devices_max_used = id + 1; | |
737 | ||
cafe5635 KO |
738 | closure_get(&c->caching); |
739 | } | |
740 | ||
1dbe32ad CL |
741 | static inline int first_minor_to_idx(int first_minor) |
742 | { | |
743 | return (first_minor/BCACHE_MINORS); | |
744 | } | |
745 | ||
746 | static inline int idx_to_first_minor(int idx) | |
747 | { | |
748 | return (idx * BCACHE_MINORS); | |
749 | } | |
750 | ||
cafe5635 KO |
751 | static void bcache_device_free(struct bcache_device *d) |
752 | { | |
753 | lockdep_assert_held(&bch_register_lock); | |
754 | ||
755 | pr_info("%s stopped", d->disk->disk_name); | |
756 | ||
757 | if (d->c) | |
758 | bcache_device_detach(d); | |
f59fce84 | 759 | if (d->disk && d->disk->flags & GENHD_FL_UP) |
cafe5635 KO |
760 | del_gendisk(d->disk); |
761 | if (d->disk && d->disk->queue) | |
762 | blk_cleanup_queue(d->disk->queue); | |
28935ab5 | 763 | if (d->disk) { |
1dbe32ad CL |
764 | ida_simple_remove(&bcache_device_idx, |
765 | first_minor_to_idx(d->disk->first_minor)); | |
cafe5635 | 766 | put_disk(d->disk); |
28935ab5 | 767 | } |
cafe5635 | 768 | |
cafe5635 KO |
769 | if (d->bio_split) |
770 | bioset_free(d->bio_split); | |
958b4338 PE |
771 | kvfree(d->full_dirty_stripes); |
772 | kvfree(d->stripe_sectors_dirty); | |
cafe5635 KO |
773 | |
774 | closure_debug_destroy(&d->cl); | |
775 | } | |
776 | ||
279afbad KO |
777 | static int bcache_device_init(struct bcache_device *d, unsigned block_size, |
778 | sector_t sectors) | |
cafe5635 KO |
779 | { |
780 | struct request_queue *q; | |
5f2b18ec BVA |
781 | const size_t max_stripes = min_t(size_t, INT_MAX, |
782 | SIZE_MAX / sizeof(atomic_t)); | |
279afbad | 783 | size_t n; |
1dbe32ad | 784 | int idx; |
279afbad | 785 | |
2d679fc7 KO |
786 | if (!d->stripe_size) |
787 | d->stripe_size = 1 << 31; | |
279afbad | 788 | |
2d679fc7 | 789 | d->nr_stripes = DIV_ROUND_UP_ULL(sectors, d->stripe_size); |
279afbad | 790 | |
5f2b18ec | 791 | if (!d->nr_stripes || d->nr_stripes > max_stripes) { |
90706094 EW |
792 | pr_err("nr_stripes too large or invalid: %u (start sector beyond end of disk?)", |
793 | (unsigned)d->nr_stripes); | |
279afbad | 794 | return -ENOMEM; |
48a915a8 | 795 | } |
279afbad KO |
796 | |
797 | n = d->nr_stripes * sizeof(atomic_t); | |
bc4e54f6 | 798 | d->stripe_sectors_dirty = kvzalloc(n, GFP_KERNEL); |
279afbad KO |
799 | if (!d->stripe_sectors_dirty) |
800 | return -ENOMEM; | |
cafe5635 | 801 | |
48a915a8 | 802 | n = BITS_TO_LONGS(d->nr_stripes) * sizeof(unsigned long); |
bc4e54f6 | 803 | d->full_dirty_stripes = kvzalloc(n, GFP_KERNEL); |
48a915a8 KO |
804 | if (!d->full_dirty_stripes) |
805 | return -ENOMEM; | |
806 | ||
1dbe32ad CL |
807 | idx = ida_simple_get(&bcache_device_idx, 0, |
808 | BCACHE_DEVICE_IDX_MAX, GFP_KERNEL); | |
809 | if (idx < 0) | |
810 | return idx; | |
b8c0d911 | 811 | |
47e0fb46 N |
812 | if (!(d->bio_split = bioset_create(4, offsetof(struct bbio, bio), |
813 | BIOSET_NEED_BVECS | | |
814 | BIOSET_NEED_RESCUER)) || | |
b8c0d911 | 815 | !(d->disk = alloc_disk(BCACHE_MINORS))) { |
1dbe32ad | 816 | ida_simple_remove(&bcache_device_idx, idx); |
cafe5635 | 817 | return -ENOMEM; |
28935ab5 | 818 | } |
cafe5635 | 819 | |
279afbad | 820 | set_capacity(d->disk, sectors); |
1dbe32ad | 821 | snprintf(d->disk->disk_name, DISK_NAME_LEN, "bcache%i", idx); |
cafe5635 KO |
822 | |
823 | d->disk->major = bcache_major; | |
1dbe32ad | 824 | d->disk->first_minor = idx_to_first_minor(idx); |
cafe5635 KO |
825 | d->disk->fops = &bcache_ops; |
826 | d->disk->private_data = d; | |
827 | ||
28935ab5 KO |
828 | q = blk_alloc_queue(GFP_KERNEL); |
829 | if (!q) | |
830 | return -ENOMEM; | |
831 | ||
cafe5635 KO |
832 | blk_queue_make_request(q, NULL); |
833 | d->disk->queue = q; | |
834 | q->queuedata = d; | |
dc3b17cc | 835 | q->backing_dev_info->congested_data = d; |
cafe5635 KO |
836 | q->limits.max_hw_sectors = UINT_MAX; |
837 | q->limits.max_sectors = UINT_MAX; | |
838 | q->limits.max_segment_size = UINT_MAX; | |
839 | q->limits.max_segments = BIO_MAX_PAGES; | |
2bb4cd5c | 840 | blk_queue_max_discard_sectors(q, UINT_MAX); |
90db6919 | 841 | q->limits.discard_granularity = 512; |
cafe5635 KO |
842 | q->limits.io_min = block_size; |
843 | q->limits.logical_block_size = block_size; | |
844 | q->limits.physical_block_size = block_size; | |
44e1ebe2 BVA |
845 | blk_queue_flag_set(QUEUE_FLAG_NONROT, d->disk->queue); |
846 | blk_queue_flag_clear(QUEUE_FLAG_ADD_RANDOM, d->disk->queue); | |
847 | blk_queue_flag_set(QUEUE_FLAG_DISCARD, d->disk->queue); | |
cafe5635 | 848 | |
84b4ff9e | 849 | blk_queue_write_cache(q, true, true); |
54d12f2b | 850 | |
cafe5635 KO |
851 | return 0; |
852 | } | |
853 | ||
854 | /* Cached device */ | |
855 | ||
856 | static void calc_cached_dev_sectors(struct cache_set *c) | |
857 | { | |
858 | uint64_t sectors = 0; | |
859 | struct cached_dev *dc; | |
860 | ||
861 | list_for_each_entry(dc, &c->cached_devs, list) | |
862 | sectors += bdev_sectors(dc->bdev); | |
863 | ||
864 | c->cached_dev_sectors = sectors; | |
865 | } | |
866 | ||
867 | void bch_cached_dev_run(struct cached_dev *dc) | |
868 | { | |
869 | struct bcache_device *d = &dc->disk; | |
ab9e1400 | 870 | char buf[SB_LABEL_SIZE + 1]; |
a25c32be GP |
871 | char *env[] = { |
872 | "DRIVER=bcache", | |
873 | kasprintf(GFP_KERNEL, "CACHED_UUID=%pU", dc->sb.uuid), | |
ab9e1400 GP |
874 | NULL, |
875 | NULL, | |
a25c32be | 876 | }; |
cafe5635 | 877 | |
ab9e1400 GP |
878 | memcpy(buf, dc->sb.label, SB_LABEL_SIZE); |
879 | buf[SB_LABEL_SIZE] = '\0'; | |
880 | env[2] = kasprintf(GFP_KERNEL, "CACHED_LABEL=%s", buf); | |
881 | ||
4d4d8573 AV |
882 | if (atomic_xchg(&dc->running, 1)) { |
883 | kfree(env[1]); | |
884 | kfree(env[2]); | |
cafe5635 | 885 | return; |
4d4d8573 | 886 | } |
cafe5635 KO |
887 | |
888 | if (!d->c && | |
889 | BDEV_STATE(&dc->sb) != BDEV_STATE_NONE) { | |
890 | struct closure cl; | |
891 | closure_init_stack(&cl); | |
892 | ||
893 | SET_BDEV_STATE(&dc->sb, BDEV_STATE_STALE); | |
894 | bch_write_bdev_super(dc, &cl); | |
895 | closure_sync(&cl); | |
896 | } | |
897 | ||
898 | add_disk(d->disk); | |
ee668506 | 899 | bd_link_disk_holder(dc->bdev, dc->disk.disk); |
a25c32be GP |
900 | /* won't show up in the uevent file, use udevadm monitor -e instead |
901 | * only class / kset properties are persistent */ | |
cafe5635 | 902 | kobject_uevent_env(&disk_to_dev(d->disk)->kobj, KOBJ_CHANGE, env); |
a25c32be | 903 | kfree(env[1]); |
ab9e1400 | 904 | kfree(env[2]); |
a25c32be | 905 | |
cafe5635 KO |
906 | if (sysfs_create_link(&d->kobj, &disk_to_dev(d->disk)->kobj, "dev") || |
907 | sysfs_create_link(&disk_to_dev(d->disk)->kobj, &d->kobj, "bcache")) | |
908 | pr_debug("error creating sysfs link"); | |
909 | } | |
910 | ||
3fd47bfe CL |
911 | /* |
912 | * If BCACHE_DEV_RATE_DW_RUNNING is set, it means routine of the delayed | |
913 | * work dc->writeback_rate_update is running. Wait until the routine | |
914 | * quits (BCACHE_DEV_RATE_DW_RUNNING is clear), then continue to | |
915 | * cancel it. If BCACHE_DEV_RATE_DW_RUNNING is not clear after time_out | |
916 | * seconds, give up waiting here and continue to cancel it too. | |
917 | */ | |
918 | static void cancel_writeback_rate_update_dwork(struct cached_dev *dc) | |
919 | { | |
920 | int time_out = WRITEBACK_RATE_UPDATE_SECS_MAX * HZ; | |
921 | ||
922 | do { | |
923 | if (!test_bit(BCACHE_DEV_RATE_DW_RUNNING, | |
924 | &dc->disk.flags)) | |
925 | break; | |
926 | time_out--; | |
927 | schedule_timeout_interruptible(1); | |
928 | } while (time_out > 0); | |
929 | ||
930 | if (time_out == 0) | |
931 | pr_warn("give up waiting for dc->writeback_write_update to quit"); | |
932 | ||
933 | cancel_delayed_work_sync(&dc->writeback_rate_update); | |
934 | } | |
935 | ||
cafe5635 KO |
936 | static void cached_dev_detach_finish(struct work_struct *w) |
937 | { | |
938 | struct cached_dev *dc = container_of(w, struct cached_dev, detach); | |
cafe5635 KO |
939 | struct closure cl; |
940 | closure_init_stack(&cl); | |
941 | ||
c4d951dd | 942 | BUG_ON(!test_bit(BCACHE_DEV_DETACHING, &dc->disk.flags)); |
3b304d24 | 943 | BUG_ON(refcount_read(&dc->count)); |
cafe5635 | 944 | |
cafe5635 KO |
945 | mutex_lock(&bch_register_lock); |
946 | ||
3fd47bfe CL |
947 | if (test_and_clear_bit(BCACHE_DEV_WB_RUNNING, &dc->disk.flags)) |
948 | cancel_writeback_rate_update_dwork(dc); | |
949 | ||
8d29c442 TJ |
950 | if (!IS_ERR_OR_NULL(dc->writeback_thread)) { |
951 | kthread_stop(dc->writeback_thread); | |
952 | dc->writeback_thread = NULL; | |
953 | } | |
954 | ||
cafe5635 KO |
955 | memset(&dc->sb.set_uuid, 0, 16); |
956 | SET_BDEV_STATE(&dc->sb, BDEV_STATE_NONE); | |
957 | ||
958 | bch_write_bdev_super(dc, &cl); | |
959 | closure_sync(&cl); | |
960 | ||
961 | bcache_device_detach(&dc->disk); | |
962 | list_move(&dc->list, &uncached_devices); | |
963 | ||
c4d951dd | 964 | clear_bit(BCACHE_DEV_DETACHING, &dc->disk.flags); |
5b1016e6 | 965 | clear_bit(BCACHE_DEV_UNLINK_DONE, &dc->disk.flags); |
c4d951dd | 966 | |
cafe5635 KO |
967 | mutex_unlock(&bch_register_lock); |
968 | ||
6e916a7e | 969 | pr_info("Caching disabled for %s", dc->backing_dev_name); |
cafe5635 KO |
970 | |
971 | /* Drop ref we took in cached_dev_detach() */ | |
972 | closure_put(&dc->disk.cl); | |
973 | } | |
974 | ||
975 | void bch_cached_dev_detach(struct cached_dev *dc) | |
976 | { | |
977 | lockdep_assert_held(&bch_register_lock); | |
978 | ||
c4d951dd | 979 | if (test_bit(BCACHE_DEV_CLOSING, &dc->disk.flags)) |
cafe5635 KO |
980 | return; |
981 | ||
c4d951dd | 982 | if (test_and_set_bit(BCACHE_DEV_DETACHING, &dc->disk.flags)) |
cafe5635 KO |
983 | return; |
984 | ||
985 | /* | |
986 | * Block the device from being closed and freed until we're finished | |
987 | * detaching | |
988 | */ | |
989 | closure_get(&dc->disk.cl); | |
990 | ||
991 | bch_writeback_queue(dc); | |
3fd47bfe | 992 | |
cafe5635 KO |
993 | cached_dev_put(dc); |
994 | } | |
995 | ||
73ac105b TJ |
996 | int bch_cached_dev_attach(struct cached_dev *dc, struct cache_set *c, |
997 | uint8_t *set_uuid) | |
cafe5635 KO |
998 | { |
999 | uint32_t rtime = cpu_to_le32(get_seconds()); | |
1000 | struct uuid_entry *u; | |
86755b7a | 1001 | struct cached_dev *exist_dc, *t; |
cafe5635 | 1002 | |
73ac105b TJ |
1003 | if ((set_uuid && memcmp(set_uuid, c->sb.set_uuid, 16)) || |
1004 | (!set_uuid && memcmp(dc->sb.set_uuid, c->sb.set_uuid, 16))) | |
cafe5635 KO |
1005 | return -ENOENT; |
1006 | ||
1007 | if (dc->disk.c) { | |
6e916a7e CL |
1008 | pr_err("Can't attach %s: already attached", |
1009 | dc->backing_dev_name); | |
cafe5635 KO |
1010 | return -EINVAL; |
1011 | } | |
1012 | ||
1013 | if (test_bit(CACHE_SET_STOPPING, &c->flags)) { | |
6e916a7e CL |
1014 | pr_err("Can't attach %s: shutting down", |
1015 | dc->backing_dev_name); | |
cafe5635 KO |
1016 | return -EINVAL; |
1017 | } | |
1018 | ||
1019 | if (dc->sb.block_size < c->sb.block_size) { | |
1020 | /* Will die */ | |
b1a67b0f | 1021 | pr_err("Couldn't attach %s: block size less than set's block size", |
6e916a7e | 1022 | dc->backing_dev_name); |
cafe5635 KO |
1023 | return -EINVAL; |
1024 | } | |
1025 | ||
86755b7a ML |
1026 | /* Check whether already attached */ |
1027 | list_for_each_entry_safe(exist_dc, t, &c->cached_devs, list) { | |
1028 | if (!memcmp(dc->sb.uuid, exist_dc->sb.uuid, 16)) { | |
1029 | pr_err("Tried to attach %s but duplicate UUID already attached", | |
6e916a7e | 1030 | dc->backing_dev_name); |
86755b7a ML |
1031 | |
1032 | return -EINVAL; | |
1033 | } | |
1034 | } | |
1035 | ||
cafe5635 KO |
1036 | u = uuid_find(c, dc->sb.uuid); |
1037 | ||
1038 | if (u && | |
1039 | (BDEV_STATE(&dc->sb) == BDEV_STATE_STALE || | |
1040 | BDEV_STATE(&dc->sb) == BDEV_STATE_NONE)) { | |
1041 | memcpy(u->uuid, invalid_uuid, 16); | |
1042 | u->invalidated = cpu_to_le32(get_seconds()); | |
1043 | u = NULL; | |
1044 | } | |
1045 | ||
1046 | if (!u) { | |
1047 | if (BDEV_STATE(&dc->sb) == BDEV_STATE_DIRTY) { | |
6e916a7e CL |
1048 | pr_err("Couldn't find uuid for %s in set", |
1049 | dc->backing_dev_name); | |
cafe5635 KO |
1050 | return -ENOENT; |
1051 | } | |
1052 | ||
1053 | u = uuid_find_empty(c); | |
1054 | if (!u) { | |
6e916a7e CL |
1055 | pr_err("Not caching %s, no room for UUID", |
1056 | dc->backing_dev_name); | |
cafe5635 KO |
1057 | return -EINVAL; |
1058 | } | |
1059 | } | |
1060 | ||
1061 | /* Deadlocks since we're called via sysfs... | |
1062 | sysfs_remove_file(&dc->kobj, &sysfs_attach); | |
1063 | */ | |
1064 | ||
169ef1cf | 1065 | if (bch_is_zero(u->uuid, 16)) { |
cafe5635 KO |
1066 | struct closure cl; |
1067 | closure_init_stack(&cl); | |
1068 | ||
1069 | memcpy(u->uuid, dc->sb.uuid, 16); | |
1070 | memcpy(u->label, dc->sb.label, SB_LABEL_SIZE); | |
1071 | u->first_reg = u->last_reg = rtime; | |
1072 | bch_uuid_write(c); | |
1073 | ||
1074 | memcpy(dc->sb.set_uuid, c->sb.set_uuid, 16); | |
1075 | SET_BDEV_STATE(&dc->sb, BDEV_STATE_CLEAN); | |
1076 | ||
1077 | bch_write_bdev_super(dc, &cl); | |
1078 | closure_sync(&cl); | |
1079 | } else { | |
1080 | u->last_reg = rtime; | |
1081 | bch_uuid_write(c); | |
1082 | } | |
1083 | ||
1084 | bcache_device_attach(&dc->disk, c, u - c->uuids); | |
cafe5635 KO |
1085 | list_move(&dc->list, &c->cached_devs); |
1086 | calc_cached_dev_sectors(c); | |
1087 | ||
1088 | smp_wmb(); | |
1089 | /* | |
1090 | * dc->c must be set before dc->count != 0 - paired with the mb in | |
1091 | * cached_dev_get() | |
1092 | */ | |
3b304d24 | 1093 | refcount_set(&dc->count, 1); |
cafe5635 | 1094 | |
07cc6ef8 EW |
1095 | /* Block writeback thread, but spawn it */ |
1096 | down_write(&dc->writeback_lock); | |
1097 | if (bch_cached_dev_writeback_start(dc)) { | |
1098 | up_write(&dc->writeback_lock); | |
9e5c3535 | 1099 | return -ENOMEM; |
07cc6ef8 | 1100 | } |
9e5c3535 | 1101 | |
cafe5635 | 1102 | if (BDEV_STATE(&dc->sb) == BDEV_STATE_DIRTY) { |
175206cf | 1103 | bch_sectors_dirty_init(&dc->disk); |
cafe5635 | 1104 | atomic_set(&dc->has_dirty, 1); |
cafe5635 KO |
1105 | bch_writeback_queue(dc); |
1106 | } | |
1107 | ||
1108 | bch_cached_dev_run(dc); | |
ee668506 | 1109 | bcache_device_link(&dc->disk, c, "bdev"); |
cafe5635 | 1110 | |
07cc6ef8 EW |
1111 | /* Allow the writeback thread to proceed */ |
1112 | up_write(&dc->writeback_lock); | |
1113 | ||
cafe5635 | 1114 | pr_info("Caching %s as %s on set %pU", |
6e916a7e CL |
1115 | dc->backing_dev_name, |
1116 | dc->disk.disk->disk_name, | |
cafe5635 KO |
1117 | dc->disk.c->sb.set_uuid); |
1118 | return 0; | |
1119 | } | |
1120 | ||
1121 | void bch_cached_dev_release(struct kobject *kobj) | |
1122 | { | |
1123 | struct cached_dev *dc = container_of(kobj, struct cached_dev, | |
1124 | disk.kobj); | |
1125 | kfree(dc); | |
1126 | module_put(THIS_MODULE); | |
1127 | } | |
1128 | ||
1129 | static void cached_dev_free(struct closure *cl) | |
1130 | { | |
1131 | struct cached_dev *dc = container_of(cl, struct cached_dev, disk.cl); | |
1132 | ||
3fd47bfe CL |
1133 | mutex_lock(&bch_register_lock); |
1134 | ||
1135 | if (test_and_clear_bit(BCACHE_DEV_WB_RUNNING, &dc->disk.flags)) | |
1136 | cancel_writeback_rate_update_dwork(dc); | |
1137 | ||
a664d0f0 SP |
1138 | if (!IS_ERR_OR_NULL(dc->writeback_thread)) |
1139 | kthread_stop(dc->writeback_thread); | |
9baf3097 TJ |
1140 | if (dc->writeback_write_wq) |
1141 | destroy_workqueue(dc->writeback_write_wq); | |
cafe5635 | 1142 | |
f59fce84 KO |
1143 | if (atomic_read(&dc->running)) |
1144 | bd_unlink_disk_holder(dc->bdev, dc->disk.disk); | |
cafe5635 KO |
1145 | bcache_device_free(&dc->disk); |
1146 | list_del(&dc->list); | |
1147 | ||
1148 | mutex_unlock(&bch_register_lock); | |
1149 | ||
0781c874 | 1150 | if (!IS_ERR_OR_NULL(dc->bdev)) |
cafe5635 | 1151 | blkdev_put(dc->bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL); |
cafe5635 KO |
1152 | |
1153 | wake_up(&unregister_wait); | |
1154 | ||
1155 | kobject_put(&dc->disk.kobj); | |
1156 | } | |
1157 | ||
1158 | static void cached_dev_flush(struct closure *cl) | |
1159 | { | |
1160 | struct cached_dev *dc = container_of(cl, struct cached_dev, disk.cl); | |
1161 | struct bcache_device *d = &dc->disk; | |
1162 | ||
c9502ea4 | 1163 | mutex_lock(&bch_register_lock); |
c4d951dd | 1164 | bcache_device_unlink(d); |
c9502ea4 KO |
1165 | mutex_unlock(&bch_register_lock); |
1166 | ||
cafe5635 KO |
1167 | bch_cache_accounting_destroy(&dc->accounting); |
1168 | kobject_del(&d->kobj); | |
1169 | ||
1170 | continue_at(cl, cached_dev_free, system_wq); | |
1171 | } | |
1172 | ||
1173 | static int cached_dev_init(struct cached_dev *dc, unsigned block_size) | |
1174 | { | |
f59fce84 | 1175 | int ret; |
cafe5635 | 1176 | struct io *io; |
f59fce84 | 1177 | struct request_queue *q = bdev_get_queue(dc->bdev); |
cafe5635 KO |
1178 | |
1179 | __module_get(THIS_MODULE); | |
1180 | INIT_LIST_HEAD(&dc->list); | |
f59fce84 KO |
1181 | closure_init(&dc->disk.cl, NULL); |
1182 | set_closure_fn(&dc->disk.cl, cached_dev_flush, system_wq); | |
cafe5635 | 1183 | kobject_init(&dc->disk.kobj, &bch_cached_dev_ktype); |
cafe5635 | 1184 | INIT_WORK(&dc->detach, cached_dev_detach_finish); |
cb7a583e | 1185 | sema_init(&dc->sb_write_mutex, 1); |
f59fce84 KO |
1186 | INIT_LIST_HEAD(&dc->io_lru); |
1187 | spin_lock_init(&dc->io_lock); | |
1188 | bch_cache_accounting_init(&dc->accounting, &dc->disk.cl); | |
cafe5635 | 1189 | |
cafe5635 KO |
1190 | dc->sequential_cutoff = 4 << 20; |
1191 | ||
cafe5635 KO |
1192 | for (io = dc->io; io < dc->io + RECENT_IO; io++) { |
1193 | list_add(&io->lru, &dc->io_lru); | |
1194 | hlist_add_head(&io->hash, dc->io_hash + RECENT_IO); | |
1195 | } | |
1196 | ||
c78afc62 KO |
1197 | dc->disk.stripe_size = q->limits.io_opt >> 9; |
1198 | ||
1199 | if (dc->disk.stripe_size) | |
1200 | dc->partial_stripes_expensive = | |
1201 | q->limits.raid_partial_stripes_expensive; | |
1202 | ||
279afbad KO |
1203 | ret = bcache_device_init(&dc->disk, block_size, |
1204 | dc->bdev->bd_part->nr_sects - dc->sb.data_offset); | |
f59fce84 KO |
1205 | if (ret) |
1206 | return ret; | |
1207 | ||
dc3b17cc JK |
1208 | dc->disk.disk->queue->backing_dev_info->ra_pages = |
1209 | max(dc->disk.disk->queue->backing_dev_info->ra_pages, | |
1210 | q->backing_dev_info->ra_pages); | |
f59fce84 | 1211 | |
c7b7bd07 CL |
1212 | atomic_set(&dc->io_errors, 0); |
1213 | dc->io_disable = false; | |
1214 | dc->error_limit = DEFAULT_CACHED_DEV_ERROR_LIMIT; | |
7e027ca4 CL |
1215 | /* default to auto */ |
1216 | dc->stop_when_cache_set_failed = BCH_CACHED_DEV_STOP_AUTO; | |
1217 | ||
f59fce84 KO |
1218 | bch_cached_dev_request_init(dc); |
1219 | bch_cached_dev_writeback_init(dc); | |
cafe5635 | 1220 | return 0; |
cafe5635 KO |
1221 | } |
1222 | ||
1223 | /* Cached device - bcache superblock */ | |
1224 | ||
f59fce84 | 1225 | static void register_bdev(struct cache_sb *sb, struct page *sb_page, |
cafe5635 KO |
1226 | struct block_device *bdev, |
1227 | struct cached_dev *dc) | |
1228 | { | |
cafe5635 | 1229 | const char *err = "cannot allocate memory"; |
cafe5635 KO |
1230 | struct cache_set *c; |
1231 | ||
6e916a7e | 1232 | bdevname(bdev, dc->backing_dev_name); |
cafe5635 | 1233 | memcpy(&dc->sb, sb, sizeof(struct cache_sb)); |
cafe5635 KO |
1234 | dc->bdev = bdev; |
1235 | dc->bdev->bd_holder = dc; | |
1236 | ||
3a83f467 | 1237 | bio_init(&dc->sb_bio, dc->sb_bio.bi_inline_vecs, 1); |
263663cd | 1238 | bio_first_bvec_all(&dc->sb_bio)->bv_page = sb_page; |
f59fce84 | 1239 | get_page(sb_page); |
4f0fd955 | 1240 | |
6e916a7e | 1241 | |
f59fce84 KO |
1242 | if (cached_dev_init(dc, sb->block_size << 9)) |
1243 | goto err; | |
cafe5635 KO |
1244 | |
1245 | err = "error creating kobject"; | |
1246 | if (kobject_add(&dc->disk.kobj, &part_to_dev(bdev->bd_part)->kobj, | |
1247 | "bcache")) | |
1248 | goto err; | |
1249 | if (bch_cache_accounting_add_kobjs(&dc->accounting, &dc->disk.kobj)) | |
1250 | goto err; | |
1251 | ||
6e916a7e | 1252 | pr_info("registered backing device %s", dc->backing_dev_name); |
f59fce84 | 1253 | |
cafe5635 KO |
1254 | list_add(&dc->list, &uncached_devices); |
1255 | list_for_each_entry(c, &bch_cache_sets, list) | |
73ac105b | 1256 | bch_cached_dev_attach(dc, c, NULL); |
cafe5635 KO |
1257 | |
1258 | if (BDEV_STATE(&dc->sb) == BDEV_STATE_NONE || | |
1259 | BDEV_STATE(&dc->sb) == BDEV_STATE_STALE) | |
1260 | bch_cached_dev_run(dc); | |
1261 | ||
f59fce84 | 1262 | return; |
cafe5635 | 1263 | err: |
6e916a7e | 1264 | pr_notice("error %s: %s", dc->backing_dev_name, err); |
f59fce84 | 1265 | bcache_device_stop(&dc->disk); |
cafe5635 KO |
1266 | } |
1267 | ||
1268 | /* Flash only volumes */ | |
1269 | ||
1270 | void bch_flash_dev_release(struct kobject *kobj) | |
1271 | { | |
1272 | struct bcache_device *d = container_of(kobj, struct bcache_device, | |
1273 | kobj); | |
1274 | kfree(d); | |
1275 | } | |
1276 | ||
1277 | static void flash_dev_free(struct closure *cl) | |
1278 | { | |
1279 | struct bcache_device *d = container_of(cl, struct bcache_device, cl); | |
e5112201 | 1280 | mutex_lock(&bch_register_lock); |
cafe5635 | 1281 | bcache_device_free(d); |
e5112201 | 1282 | mutex_unlock(&bch_register_lock); |
cafe5635 KO |
1283 | kobject_put(&d->kobj); |
1284 | } | |
1285 | ||
1286 | static void flash_dev_flush(struct closure *cl) | |
1287 | { | |
1288 | struct bcache_device *d = container_of(cl, struct bcache_device, cl); | |
1289 | ||
e5112201 | 1290 | mutex_lock(&bch_register_lock); |
ee668506 | 1291 | bcache_device_unlink(d); |
e5112201 | 1292 | mutex_unlock(&bch_register_lock); |
cafe5635 KO |
1293 | kobject_del(&d->kobj); |
1294 | continue_at(cl, flash_dev_free, system_wq); | |
1295 | } | |
1296 | ||
1297 | static int flash_dev_run(struct cache_set *c, struct uuid_entry *u) | |
1298 | { | |
1299 | struct bcache_device *d = kzalloc(sizeof(struct bcache_device), | |
1300 | GFP_KERNEL); | |
1301 | if (!d) | |
1302 | return -ENOMEM; | |
1303 | ||
1304 | closure_init(&d->cl, NULL); | |
1305 | set_closure_fn(&d->cl, flash_dev_flush, system_wq); | |
1306 | ||
1307 | kobject_init(&d->kobj, &bch_flash_dev_ktype); | |
1308 | ||
279afbad | 1309 | if (bcache_device_init(d, block_bytes(c), u->sectors)) |
cafe5635 KO |
1310 | goto err; |
1311 | ||
1312 | bcache_device_attach(d, c, u - c->uuids); | |
175206cf | 1313 | bch_sectors_dirty_init(d); |
cafe5635 KO |
1314 | bch_flash_dev_request_init(d); |
1315 | add_disk(d->disk); | |
1316 | ||
1317 | if (kobject_add(&d->kobj, &disk_to_dev(d->disk)->kobj, "bcache")) | |
1318 | goto err; | |
1319 | ||
1320 | bcache_device_link(d, c, "volume"); | |
1321 | ||
1322 | return 0; | |
1323 | err: | |
1324 | kobject_put(&d->kobj); | |
1325 | return -ENOMEM; | |
1326 | } | |
1327 | ||
1328 | static int flash_devs_run(struct cache_set *c) | |
1329 | { | |
1330 | int ret = 0; | |
1331 | struct uuid_entry *u; | |
1332 | ||
1333 | for (u = c->uuids; | |
02aa8a8b | 1334 | u < c->uuids + c->nr_uuids && !ret; |
cafe5635 KO |
1335 | u++) |
1336 | if (UUID_FLASH_ONLY(u)) | |
1337 | ret = flash_dev_run(c, u); | |
1338 | ||
1339 | return ret; | |
1340 | } | |
1341 | ||
1342 | int bch_flash_dev_create(struct cache_set *c, uint64_t size) | |
1343 | { | |
1344 | struct uuid_entry *u; | |
1345 | ||
1346 | if (test_bit(CACHE_SET_STOPPING, &c->flags)) | |
1347 | return -EINTR; | |
1348 | ||
bf0c55c9 SP |
1349 | if (!test_bit(CACHE_SET_RUNNING, &c->flags)) |
1350 | return -EPERM; | |
1351 | ||
cafe5635 KO |
1352 | u = uuid_find_empty(c); |
1353 | if (!u) { | |
1354 | pr_err("Can't create volume, no room for UUID"); | |
1355 | return -EINVAL; | |
1356 | } | |
1357 | ||
1358 | get_random_bytes(u->uuid, 16); | |
1359 | memset(u->label, 0, 32); | |
1360 | u->first_reg = u->last_reg = cpu_to_le32(get_seconds()); | |
1361 | ||
1362 | SET_UUID_FLASH_ONLY(u, 1); | |
1363 | u->sectors = size >> 9; | |
1364 | ||
1365 | bch_uuid_write(c); | |
1366 | ||
1367 | return flash_dev_run(c, u); | |
1368 | } | |
1369 | ||
c7b7bd07 CL |
1370 | bool bch_cached_dev_error(struct cached_dev *dc) |
1371 | { | |
6147305c CL |
1372 | struct cache_set *c; |
1373 | ||
c7b7bd07 CL |
1374 | if (!dc || test_bit(BCACHE_DEV_CLOSING, &dc->disk.flags)) |
1375 | return false; | |
1376 | ||
1377 | dc->io_disable = true; | |
1378 | /* make others know io_disable is true earlier */ | |
1379 | smp_mb(); | |
1380 | ||
1381 | pr_err("stop %s: too many IO errors on backing device %s\n", | |
6e916a7e | 1382 | dc->disk.disk->disk_name, dc->backing_dev_name); |
c7b7bd07 | 1383 | |
6147305c CL |
1384 | /* |
1385 | * If the cached device is still attached to a cache set, | |
1386 | * even dc->io_disable is true and no more I/O requests | |
1387 | * accepted, cache device internal I/O (writeback scan or | |
1388 | * garbage collection) may still prevent bcache device from | |
1389 | * being stopped. So here CACHE_SET_IO_DISABLE should be | |
1390 | * set to c->flags too, to make the internal I/O to cache | |
1391 | * device rejected and stopped immediately. | |
1392 | * If c is NULL, that means the bcache device is not attached | |
1393 | * to any cache set, then no CACHE_SET_IO_DISABLE bit to set. | |
1394 | */ | |
1395 | c = dc->disk.c; | |
1396 | if (c && test_and_set_bit(CACHE_SET_IO_DISABLE, &c->flags)) | |
1397 | pr_info("CACHE_SET_IO_DISABLE already set"); | |
1398 | ||
c7b7bd07 CL |
1399 | bcache_device_stop(&dc->disk); |
1400 | return true; | |
1401 | } | |
1402 | ||
cafe5635 KO |
1403 | /* Cache set */ |
1404 | ||
1405 | __printf(2, 3) | |
1406 | bool bch_cache_set_error(struct cache_set *c, const char *fmt, ...) | |
1407 | { | |
1408 | va_list args; | |
1409 | ||
77c320eb KO |
1410 | if (c->on_error != ON_ERROR_PANIC && |
1411 | test_bit(CACHE_SET_STOPPING, &c->flags)) | |
cafe5635 KO |
1412 | return false; |
1413 | ||
771f393e CL |
1414 | if (test_and_set_bit(CACHE_SET_IO_DISABLE, &c->flags)) |
1415 | pr_warn("CACHE_SET_IO_DISABLE already set"); | |
1416 | ||
cafe5635 KO |
1417 | /* XXX: we can be called from atomic context |
1418 | acquire_console_sem(); | |
1419 | */ | |
1420 | ||
1421 | printk(KERN_ERR "bcache: error on %pU: ", c->sb.set_uuid); | |
1422 | ||
1423 | va_start(args, fmt); | |
1424 | vprintk(fmt, args); | |
1425 | va_end(args); | |
1426 | ||
1427 | printk(", disabling caching\n"); | |
1428 | ||
77c320eb KO |
1429 | if (c->on_error == ON_ERROR_PANIC) |
1430 | panic("panic forced after error\n"); | |
1431 | ||
cafe5635 KO |
1432 | bch_cache_set_unregister(c); |
1433 | return true; | |
1434 | } | |
1435 | ||
1436 | void bch_cache_set_release(struct kobject *kobj) | |
1437 | { | |
1438 | struct cache_set *c = container_of(kobj, struct cache_set, kobj); | |
1439 | kfree(c); | |
1440 | module_put(THIS_MODULE); | |
1441 | } | |
1442 | ||
1443 | static void cache_set_free(struct closure *cl) | |
1444 | { | |
1445 | struct cache_set *c = container_of(cl, struct cache_set, cl); | |
1446 | struct cache *ca; | |
1447 | unsigned i; | |
1448 | ||
1449 | if (!IS_ERR_OR_NULL(c->debug)) | |
1450 | debugfs_remove(c->debug); | |
1451 | ||
1452 | bch_open_buckets_free(c); | |
1453 | bch_btree_cache_free(c); | |
1454 | bch_journal_free(c); | |
1455 | ||
1456 | for_each_cache(ca, c, i) | |
c9a78332 SP |
1457 | if (ca) { |
1458 | ca->set = NULL; | |
1459 | c->cache[ca->sb.nr_this_dev] = NULL; | |
cafe5635 | 1460 | kobject_put(&ca->kobj); |
c9a78332 | 1461 | } |
cafe5635 | 1462 | |
67539e85 | 1463 | bch_bset_sort_state_free(&c->sort); |
cafe5635 | 1464 | free_pages((unsigned long) c->uuids, ilog2(bucket_pages(c))); |
cafe5635 | 1465 | |
da415a09 NS |
1466 | if (c->moving_gc_wq) |
1467 | destroy_workqueue(c->moving_gc_wq); | |
cafe5635 KO |
1468 | if (c->bio_split) |
1469 | bioset_free(c->bio_split); | |
57943511 KO |
1470 | if (c->fill_iter) |
1471 | mempool_destroy(c->fill_iter); | |
cafe5635 KO |
1472 | if (c->bio_meta) |
1473 | mempool_destroy(c->bio_meta); | |
1474 | if (c->search) | |
1475 | mempool_destroy(c->search); | |
1476 | kfree(c->devices); | |
1477 | ||
1478 | mutex_lock(&bch_register_lock); | |
1479 | list_del(&c->list); | |
1480 | mutex_unlock(&bch_register_lock); | |
1481 | ||
1482 | pr_info("Cache set %pU unregistered", c->sb.set_uuid); | |
1483 | wake_up(&unregister_wait); | |
1484 | ||
1485 | closure_debug_destroy(&c->cl); | |
1486 | kobject_put(&c->kobj); | |
1487 | } | |
1488 | ||
1489 | static void cache_set_flush(struct closure *cl) | |
1490 | { | |
1491 | struct cache_set *c = container_of(cl, struct cache_set, caching); | |
79826c35 | 1492 | struct cache *ca; |
cafe5635 | 1493 | struct btree *b; |
79826c35 | 1494 | unsigned i; |
cafe5635 KO |
1495 | |
1496 | bch_cache_accounting_destroy(&c->accounting); | |
1497 | ||
1498 | kobject_put(&c->internal); | |
1499 | kobject_del(&c->kobj); | |
1500 | ||
72a44517 KO |
1501 | if (c->gc_thread) |
1502 | kthread_stop(c->gc_thread); | |
1503 | ||
cafe5635 KO |
1504 | if (!IS_ERR_OR_NULL(c->root)) |
1505 | list_add(&c->root->list, &c->btree_cache); | |
1506 | ||
1507 | /* Should skip this if we're unregistering because of an error */ | |
2a285686 KO |
1508 | list_for_each_entry(b, &c->btree_cache, list) { |
1509 | mutex_lock(&b->write_lock); | |
cafe5635 | 1510 | if (btree_node_dirty(b)) |
2a285686 KO |
1511 | __bch_btree_node_write(b, NULL); |
1512 | mutex_unlock(&b->write_lock); | |
1513 | } | |
cafe5635 | 1514 | |
79826c35 KO |
1515 | for_each_cache(ca, c, i) |
1516 | if (ca->alloc_thread) | |
1517 | kthread_stop(ca->alloc_thread); | |
1518 | ||
5b1016e6 KO |
1519 | if (c->journal.cur) { |
1520 | cancel_delayed_work_sync(&c->journal.work); | |
1521 | /* flush last journal entry if needed */ | |
1522 | c->journal.work.work.func(&c->journal.work.work); | |
1523 | } | |
dabb4433 | 1524 | |
cafe5635 KO |
1525 | closure_return(cl); |
1526 | } | |
1527 | ||
7e027ca4 CL |
1528 | /* |
1529 | * This function is only called when CACHE_SET_IO_DISABLE is set, which means | |
1530 | * cache set is unregistering due to too many I/O errors. In this condition, | |
1531 | * the bcache device might be stopped, it depends on stop_when_cache_set_failed | |
1532 | * value and whether the broken cache has dirty data: | |
1533 | * | |
1534 | * dc->stop_when_cache_set_failed dc->has_dirty stop bcache device | |
1535 | * BCH_CACHED_STOP_AUTO 0 NO | |
1536 | * BCH_CACHED_STOP_AUTO 1 YES | |
1537 | * BCH_CACHED_DEV_STOP_ALWAYS 0 YES | |
1538 | * BCH_CACHED_DEV_STOP_ALWAYS 1 YES | |
1539 | * | |
1540 | * The expected behavior is, if stop_when_cache_set_failed is configured to | |
1541 | * "auto" via sysfs interface, the bcache device will not be stopped if the | |
1542 | * backing device is clean on the broken cache device. | |
1543 | */ | |
1544 | static void conditional_stop_bcache_device(struct cache_set *c, | |
1545 | struct bcache_device *d, | |
1546 | struct cached_dev *dc) | |
1547 | { | |
1548 | if (dc->stop_when_cache_set_failed == BCH_CACHED_DEV_STOP_ALWAYS) { | |
1549 | pr_warn("stop_when_cache_set_failed of %s is \"always\", stop it for failed cache set %pU.", | |
1550 | d->disk->disk_name, c->sb.set_uuid); | |
1551 | bcache_device_stop(d); | |
1552 | } else if (atomic_read(&dc->has_dirty)) { | |
1553 | /* | |
1554 | * dc->stop_when_cache_set_failed == BCH_CACHED_STOP_AUTO | |
1555 | * and dc->has_dirty == 1 | |
1556 | */ | |
1557 | pr_warn("stop_when_cache_set_failed of %s is \"auto\" and cache is dirty, stop it to avoid potential data corruption.", | |
1558 | d->disk->disk_name); | |
4fd8e138 CL |
1559 | /* |
1560 | * There might be a small time gap that cache set is | |
1561 | * released but bcache device is not. Inside this time | |
1562 | * gap, regular I/O requests will directly go into | |
1563 | * backing device as no cache set attached to. This | |
1564 | * behavior may also introduce potential inconsistence | |
1565 | * data in writeback mode while cache is dirty. | |
1566 | * Therefore before calling bcache_device_stop() due | |
1567 | * to a broken cache device, dc->io_disable should be | |
1568 | * explicitly set to true. | |
1569 | */ | |
1570 | dc->io_disable = true; | |
1571 | /* make others know io_disable is true earlier */ | |
1572 | smp_mb(); | |
7e027ca4 CL |
1573 | bcache_device_stop(d); |
1574 | } else { | |
1575 | /* | |
1576 | * dc->stop_when_cache_set_failed == BCH_CACHED_STOP_AUTO | |
1577 | * and dc->has_dirty == 0 | |
1578 | */ | |
1579 | pr_warn("stop_when_cache_set_failed of %s is \"auto\" and cache is clean, keep it alive.", | |
1580 | d->disk->disk_name); | |
1581 | } | |
1582 | } | |
1583 | ||
cafe5635 KO |
1584 | static void __cache_set_unregister(struct closure *cl) |
1585 | { | |
1586 | struct cache_set *c = container_of(cl, struct cache_set, caching); | |
5caa52af | 1587 | struct cached_dev *dc; |
7e027ca4 | 1588 | struct bcache_device *d; |
cafe5635 KO |
1589 | size_t i; |
1590 | ||
1591 | mutex_lock(&bch_register_lock); | |
1592 | ||
7e027ca4 CL |
1593 | for (i = 0; i < c->devices_max_used; i++) { |
1594 | d = c->devices[i]; | |
1595 | if (!d) | |
1596 | continue; | |
1597 | ||
1598 | if (!UUID_FLASH_ONLY(&c->uuids[i]) && | |
1599 | test_bit(CACHE_SET_UNREGISTERING, &c->flags)) { | |
1600 | dc = container_of(d, struct cached_dev, disk); | |
1601 | bch_cached_dev_detach(dc); | |
1602 | if (test_bit(CACHE_SET_IO_DISABLE, &c->flags)) | |
1603 | conditional_stop_bcache_device(c, d, dc); | |
1604 | } else { | |
1605 | bcache_device_stop(d); | |
5caa52af | 1606 | } |
7e027ca4 | 1607 | } |
cafe5635 KO |
1608 | |
1609 | mutex_unlock(&bch_register_lock); | |
1610 | ||
1611 | continue_at(cl, cache_set_flush, system_wq); | |
1612 | } | |
1613 | ||
1614 | void bch_cache_set_stop(struct cache_set *c) | |
1615 | { | |
1616 | if (!test_and_set_bit(CACHE_SET_STOPPING, &c->flags)) | |
1617 | closure_queue(&c->caching); | |
1618 | } | |
1619 | ||
1620 | void bch_cache_set_unregister(struct cache_set *c) | |
1621 | { | |
1622 | set_bit(CACHE_SET_UNREGISTERING, &c->flags); | |
1623 | bch_cache_set_stop(c); | |
1624 | } | |
1625 | ||
1626 | #define alloc_bucket_pages(gfp, c) \ | |
1627 | ((void *) __get_free_pages(__GFP_ZERO|gfp, ilog2(bucket_pages(c)))) | |
1628 | ||
1629 | struct cache_set *bch_cache_set_alloc(struct cache_sb *sb) | |
1630 | { | |
1631 | int iter_size; | |
1632 | struct cache_set *c = kzalloc(sizeof(struct cache_set), GFP_KERNEL); | |
1633 | if (!c) | |
1634 | return NULL; | |
1635 | ||
1636 | __module_get(THIS_MODULE); | |
1637 | closure_init(&c->cl, NULL); | |
1638 | set_closure_fn(&c->cl, cache_set_free, system_wq); | |
1639 | ||
1640 | closure_init(&c->caching, &c->cl); | |
1641 | set_closure_fn(&c->caching, __cache_set_unregister, system_wq); | |
1642 | ||
1643 | /* Maybe create continue_at_noreturn() and use it here? */ | |
1644 | closure_set_stopped(&c->cl); | |
1645 | closure_put(&c->cl); | |
1646 | ||
1647 | kobject_init(&c->kobj, &bch_cache_set_ktype); | |
1648 | kobject_init(&c->internal, &bch_cache_set_internal_ktype); | |
1649 | ||
1650 | bch_cache_accounting_init(&c->accounting, &c->cl); | |
1651 | ||
1652 | memcpy(c->sb.set_uuid, sb->set_uuid, 16); | |
1653 | c->sb.block_size = sb->block_size; | |
1654 | c->sb.bucket_size = sb->bucket_size; | |
1655 | c->sb.nr_in_set = sb->nr_in_set; | |
1656 | c->sb.last_mount = sb->last_mount; | |
1657 | c->bucket_bits = ilog2(sb->bucket_size); | |
1658 | c->block_bits = ilog2(sb->block_size); | |
1659 | c->nr_uuids = bucket_bytes(c) / sizeof(struct uuid_entry); | |
2831231d | 1660 | c->devices_max_used = 0; |
ee811287 | 1661 | c->btree_pages = bucket_pages(c); |
cafe5635 KO |
1662 | if (c->btree_pages > BTREE_MAX_PAGES) |
1663 | c->btree_pages = max_t(int, c->btree_pages / 4, | |
1664 | BTREE_MAX_PAGES); | |
1665 | ||
cb7a583e | 1666 | sema_init(&c->sb_write_mutex, 1); |
e8e1d468 | 1667 | mutex_init(&c->bucket_lock); |
0a63b66d | 1668 | init_waitqueue_head(&c->btree_cache_wait); |
35fcd848 | 1669 | init_waitqueue_head(&c->bucket_wait); |
be628be0 | 1670 | init_waitqueue_head(&c->gc_wait); |
cb7a583e | 1671 | sema_init(&c->uuid_write_mutex, 1); |
65d22e91 | 1672 | |
65d22e91 KO |
1673 | spin_lock_init(&c->btree_gc_time.lock); |
1674 | spin_lock_init(&c->btree_split_time.lock); | |
1675 | spin_lock_init(&c->btree_read_time.lock); | |
e8e1d468 | 1676 | |
cafe5635 KO |
1677 | bch_moving_init_cache_set(c); |
1678 | ||
1679 | INIT_LIST_HEAD(&c->list); | |
1680 | INIT_LIST_HEAD(&c->cached_devs); | |
1681 | INIT_LIST_HEAD(&c->btree_cache); | |
1682 | INIT_LIST_HEAD(&c->btree_cache_freeable); | |
1683 | INIT_LIST_HEAD(&c->btree_cache_freed); | |
1684 | INIT_LIST_HEAD(&c->data_buckets); | |
1685 | ||
1686 | c->search = mempool_create_slab_pool(32, bch_search_cache); | |
1687 | if (!c->search) | |
1688 | goto err; | |
1689 | ||
1690 | iter_size = (sb->bucket_size / sb->block_size + 1) * | |
1691 | sizeof(struct btree_iter_set); | |
1692 | ||
1693 | if (!(c->devices = kzalloc(c->nr_uuids * sizeof(void *), GFP_KERNEL)) || | |
1694 | !(c->bio_meta = mempool_create_kmalloc_pool(2, | |
1695 | sizeof(struct bbio) + sizeof(struct bio_vec) * | |
1696 | bucket_pages(c))) || | |
57943511 | 1697 | !(c->fill_iter = mempool_create_kmalloc_pool(1, iter_size)) || |
47e0fb46 N |
1698 | !(c->bio_split = bioset_create(4, offsetof(struct bbio, bio), |
1699 | BIOSET_NEED_BVECS | | |
1700 | BIOSET_NEED_RESCUER)) || | |
cafe5635 | 1701 | !(c->uuids = alloc_bucket_pages(GFP_KERNEL, c)) || |
81baf90a BS |
1702 | !(c->moving_gc_wq = alloc_workqueue("bcache_gc", |
1703 | WQ_MEM_RECLAIM, 0)) || | |
cafe5635 KO |
1704 | bch_journal_alloc(c) || |
1705 | bch_btree_cache_alloc(c) || | |
67539e85 KO |
1706 | bch_open_buckets_alloc(c) || |
1707 | bch_bset_sort_state_init(&c->sort, ilog2(c->btree_pages))) | |
cafe5635 KO |
1708 | goto err; |
1709 | ||
cafe5635 KO |
1710 | c->congested_read_threshold_us = 2000; |
1711 | c->congested_write_threshold_us = 20000; | |
7ba0d830 | 1712 | c->error_limit = DEFAULT_IO_ERROR_LIMIT; |
771f393e | 1713 | WARN_ON(test_and_clear_bit(CACHE_SET_IO_DISABLE, &c->flags)); |
cafe5635 KO |
1714 | |
1715 | return c; | |
1716 | err: | |
1717 | bch_cache_set_unregister(c); | |
1718 | return NULL; | |
1719 | } | |
1720 | ||
1721 | static void run_cache_set(struct cache_set *c) | |
1722 | { | |
1723 | const char *err = "cannot allocate memory"; | |
1724 | struct cached_dev *dc, *t; | |
1725 | struct cache *ca; | |
c18536a7 | 1726 | struct closure cl; |
cafe5635 KO |
1727 | unsigned i; |
1728 | ||
c18536a7 | 1729 | closure_init_stack(&cl); |
cafe5635 KO |
1730 | |
1731 | for_each_cache(ca, c, i) | |
1732 | c->nbuckets += ca->sb.nbuckets; | |
be628be0 | 1733 | set_gc_sectors(c); |
cafe5635 KO |
1734 | |
1735 | if (CACHE_SYNC(&c->sb)) { | |
1736 | LIST_HEAD(journal); | |
1737 | struct bkey *k; | |
1738 | struct jset *j; | |
1739 | ||
1740 | err = "cannot allocate memory for journal"; | |
c18536a7 | 1741 | if (bch_journal_read(c, &journal)) |
cafe5635 KO |
1742 | goto err; |
1743 | ||
1744 | pr_debug("btree_journal_read() done"); | |
1745 | ||
1746 | err = "no journal entries found"; | |
1747 | if (list_empty(&journal)) | |
1748 | goto err; | |
1749 | ||
1750 | j = &list_entry(journal.prev, struct journal_replay, list)->j; | |
1751 | ||
1752 | err = "IO error reading priorities"; | |
1753 | for_each_cache(ca, c, i) | |
1754 | prio_read(ca, j->prio_bucket[ca->sb.nr_this_dev]); | |
1755 | ||
1756 | /* | |
1757 | * If prio_read() fails it'll call cache_set_error and we'll | |
1758 | * tear everything down right away, but if we perhaps checked | |
1759 | * sooner we could avoid journal replay. | |
1760 | */ | |
1761 | ||
1762 | k = &j->btree_root; | |
1763 | ||
1764 | err = "bad btree root"; | |
65d45231 | 1765 | if (__bch_btree_ptr_invalid(c, k)) |
cafe5635 KO |
1766 | goto err; |
1767 | ||
1768 | err = "error reading btree root"; | |
2452cc89 | 1769 | c->root = bch_btree_node_get(c, NULL, k, j->btree_level, true, NULL); |
cafe5635 KO |
1770 | if (IS_ERR_OR_NULL(c->root)) |
1771 | goto err; | |
1772 | ||
1773 | list_del_init(&c->root->list); | |
1774 | rw_unlock(true, c->root); | |
1775 | ||
c18536a7 | 1776 | err = uuid_read(c, j, &cl); |
cafe5635 KO |
1777 | if (err) |
1778 | goto err; | |
1779 | ||
1780 | err = "error in recovery"; | |
c18536a7 | 1781 | if (bch_btree_check(c)) |
cafe5635 KO |
1782 | goto err; |
1783 | ||
1784 | bch_journal_mark(c, &journal); | |
2531d9ee | 1785 | bch_initial_gc_finish(c); |
cafe5635 KO |
1786 | pr_debug("btree_check() done"); |
1787 | ||
1788 | /* | |
1789 | * bcache_journal_next() can't happen sooner, or | |
1790 | * btree_gc_finish() will give spurious errors about last_gc > | |
1791 | * gc_gen - this is a hack but oh well. | |
1792 | */ | |
1793 | bch_journal_next(&c->journal); | |
1794 | ||
119ba0f8 | 1795 | err = "error starting allocator thread"; |
cafe5635 | 1796 | for_each_cache(ca, c, i) |
119ba0f8 KO |
1797 | if (bch_cache_allocator_start(ca)) |
1798 | goto err; | |
cafe5635 KO |
1799 | |
1800 | /* | |
1801 | * First place it's safe to allocate: btree_check() and | |
1802 | * btree_gc_finish() have to run before we have buckets to | |
1803 | * allocate, and bch_bucket_alloc_set() might cause a journal | |
1804 | * entry to be written so bcache_journal_next() has to be called | |
1805 | * first. | |
1806 | * | |
1807 | * If the uuids were in the old format we have to rewrite them | |
1808 | * before the next journal entry is written: | |
1809 | */ | |
1810 | if (j->version < BCACHE_JSET_VERSION_UUID) | |
1811 | __uuid_write(c); | |
1812 | ||
c18536a7 | 1813 | bch_journal_replay(c, &journal); |
cafe5635 KO |
1814 | } else { |
1815 | pr_notice("invalidating existing data"); | |
cafe5635 KO |
1816 | |
1817 | for_each_cache(ca, c, i) { | |
1818 | unsigned j; | |
1819 | ||
1820 | ca->sb.keys = clamp_t(int, ca->sb.nbuckets >> 7, | |
1821 | 2, SB_JOURNAL_BUCKETS); | |
1822 | ||
1823 | for (j = 0; j < ca->sb.keys; j++) | |
1824 | ca->sb.d[j] = ca->sb.first_bucket + j; | |
1825 | } | |
1826 | ||
2531d9ee | 1827 | bch_initial_gc_finish(c); |
cafe5635 | 1828 | |
119ba0f8 | 1829 | err = "error starting allocator thread"; |
cafe5635 | 1830 | for_each_cache(ca, c, i) |
119ba0f8 KO |
1831 | if (bch_cache_allocator_start(ca)) |
1832 | goto err; | |
cafe5635 KO |
1833 | |
1834 | mutex_lock(&c->bucket_lock); | |
1835 | for_each_cache(ca, c, i) | |
1836 | bch_prio_write(ca); | |
1837 | mutex_unlock(&c->bucket_lock); | |
1838 | ||
cafe5635 KO |
1839 | err = "cannot allocate new UUID bucket"; |
1840 | if (__uuid_write(c)) | |
72a44517 | 1841 | goto err; |
cafe5635 KO |
1842 | |
1843 | err = "cannot allocate new btree root"; | |
2452cc89 | 1844 | c->root = __bch_btree_node_alloc(c, NULL, 0, true, NULL); |
cafe5635 | 1845 | if (IS_ERR_OR_NULL(c->root)) |
72a44517 | 1846 | goto err; |
cafe5635 | 1847 | |
2a285686 | 1848 | mutex_lock(&c->root->write_lock); |
cafe5635 | 1849 | bkey_copy_key(&c->root->key, &MAX_KEY); |
c18536a7 | 1850 | bch_btree_node_write(c->root, &cl); |
2a285686 | 1851 | mutex_unlock(&c->root->write_lock); |
cafe5635 KO |
1852 | |
1853 | bch_btree_set_root(c->root); | |
1854 | rw_unlock(true, c->root); | |
1855 | ||
1856 | /* | |
1857 | * We don't want to write the first journal entry until | |
1858 | * everything is set up - fortunately journal entries won't be | |
1859 | * written until the SET_CACHE_SYNC() here: | |
1860 | */ | |
1861 | SET_CACHE_SYNC(&c->sb, true); | |
1862 | ||
1863 | bch_journal_next(&c->journal); | |
c18536a7 | 1864 | bch_journal_meta(c, &cl); |
cafe5635 KO |
1865 | } |
1866 | ||
72a44517 KO |
1867 | err = "error starting gc thread"; |
1868 | if (bch_gc_thread_start(c)) | |
1869 | goto err; | |
1870 | ||
c18536a7 | 1871 | closure_sync(&cl); |
cafe5635 KO |
1872 | c->sb.last_mount = get_seconds(); |
1873 | bcache_write_super(c); | |
1874 | ||
1875 | list_for_each_entry_safe(dc, t, &uncached_devices, list) | |
73ac105b | 1876 | bch_cached_dev_attach(dc, c, NULL); |
cafe5635 KO |
1877 | |
1878 | flash_devs_run(c); | |
1879 | ||
bf0c55c9 | 1880 | set_bit(CACHE_SET_RUNNING, &c->flags); |
cafe5635 | 1881 | return; |
cafe5635 | 1882 | err: |
c18536a7 | 1883 | closure_sync(&cl); |
cafe5635 | 1884 | /* XXX: test this, it's broken */ |
c8694948 | 1885 | bch_cache_set_error(c, "%s", err); |
cafe5635 KO |
1886 | } |
1887 | ||
1888 | static bool can_attach_cache(struct cache *ca, struct cache_set *c) | |
1889 | { | |
1890 | return ca->sb.block_size == c->sb.block_size && | |
9eb8ebeb | 1891 | ca->sb.bucket_size == c->sb.bucket_size && |
cafe5635 KO |
1892 | ca->sb.nr_in_set == c->sb.nr_in_set; |
1893 | } | |
1894 | ||
1895 | static const char *register_cache_set(struct cache *ca) | |
1896 | { | |
1897 | char buf[12]; | |
1898 | const char *err = "cannot allocate memory"; | |
1899 | struct cache_set *c; | |
1900 | ||
1901 | list_for_each_entry(c, &bch_cache_sets, list) | |
1902 | if (!memcmp(c->sb.set_uuid, ca->sb.set_uuid, 16)) { | |
1903 | if (c->cache[ca->sb.nr_this_dev]) | |
1904 | return "duplicate cache set member"; | |
1905 | ||
1906 | if (!can_attach_cache(ca, c)) | |
1907 | return "cache sb does not match set"; | |
1908 | ||
1909 | if (!CACHE_SYNC(&ca->sb)) | |
1910 | SET_CACHE_SYNC(&c->sb, false); | |
1911 | ||
1912 | goto found; | |
1913 | } | |
1914 | ||
1915 | c = bch_cache_set_alloc(&ca->sb); | |
1916 | if (!c) | |
1917 | return err; | |
1918 | ||
1919 | err = "error creating kobject"; | |
1920 | if (kobject_add(&c->kobj, bcache_kobj, "%pU", c->sb.set_uuid) || | |
1921 | kobject_add(&c->internal, &c->kobj, "internal")) | |
1922 | goto err; | |
1923 | ||
1924 | if (bch_cache_accounting_add_kobjs(&c->accounting, &c->kobj)) | |
1925 | goto err; | |
1926 | ||
1927 | bch_debug_init_cache_set(c); | |
1928 | ||
1929 | list_add(&c->list, &bch_cache_sets); | |
1930 | found: | |
1931 | sprintf(buf, "cache%i", ca->sb.nr_this_dev); | |
1932 | if (sysfs_create_link(&ca->kobj, &c->kobj, "set") || | |
1933 | sysfs_create_link(&c->kobj, &ca->kobj, buf)) | |
1934 | goto err; | |
1935 | ||
1936 | if (ca->sb.seq > c->sb.seq) { | |
1937 | c->sb.version = ca->sb.version; | |
1938 | memcpy(c->sb.set_uuid, ca->sb.set_uuid, 16); | |
1939 | c->sb.flags = ca->sb.flags; | |
1940 | c->sb.seq = ca->sb.seq; | |
1941 | pr_debug("set version = %llu", c->sb.version); | |
1942 | } | |
1943 | ||
d83353b3 | 1944 | kobject_get(&ca->kobj); |
cafe5635 KO |
1945 | ca->set = c; |
1946 | ca->set->cache[ca->sb.nr_this_dev] = ca; | |
1947 | c->cache_by_alloc[c->caches_loaded++] = ca; | |
1948 | ||
1949 | if (c->caches_loaded == c->sb.nr_in_set) | |
1950 | run_cache_set(c); | |
1951 | ||
1952 | return NULL; | |
1953 | err: | |
1954 | bch_cache_set_unregister(c); | |
1955 | return err; | |
1956 | } | |
1957 | ||
1958 | /* Cache device */ | |
1959 | ||
1960 | void bch_cache_release(struct kobject *kobj) | |
1961 | { | |
1962 | struct cache *ca = container_of(kobj, struct cache, kobj); | |
78365411 | 1963 | unsigned i; |
cafe5635 | 1964 | |
c9a78332 SP |
1965 | if (ca->set) { |
1966 | BUG_ON(ca->set->cache[ca->sb.nr_this_dev] != ca); | |
cafe5635 | 1967 | ca->set->cache[ca->sb.nr_this_dev] = NULL; |
c9a78332 | 1968 | } |
cafe5635 | 1969 | |
cafe5635 KO |
1970 | free_pages((unsigned long) ca->disk_buckets, ilog2(bucket_pages(ca))); |
1971 | kfree(ca->prio_buckets); | |
1972 | vfree(ca->buckets); | |
1973 | ||
1974 | free_heap(&ca->heap); | |
cafe5635 | 1975 | free_fifo(&ca->free_inc); |
78365411 KO |
1976 | |
1977 | for (i = 0; i < RESERVE_NR; i++) | |
1978 | free_fifo(&ca->free[i]); | |
cafe5635 KO |
1979 | |
1980 | if (ca->sb_bio.bi_inline_vecs[0].bv_page) | |
263663cd | 1981 | put_page(bio_first_page_all(&ca->sb_bio)); |
cafe5635 | 1982 | |
0781c874 | 1983 | if (!IS_ERR_OR_NULL(ca->bdev)) |
cafe5635 | 1984 | blkdev_put(ca->bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL); |
cafe5635 KO |
1985 | |
1986 | kfree(ca); | |
1987 | module_put(THIS_MODULE); | |
1988 | } | |
1989 | ||
c50d4d5d | 1990 | static int cache_alloc(struct cache *ca) |
cafe5635 KO |
1991 | { |
1992 | size_t free; | |
682811b3 | 1993 | size_t btree_buckets; |
cafe5635 KO |
1994 | struct bucket *b; |
1995 | ||
cafe5635 KO |
1996 | __module_get(THIS_MODULE); |
1997 | kobject_init(&ca->kobj, &bch_cache_ktype); | |
1998 | ||
3a83f467 | 1999 | bio_init(&ca->journal.bio, ca->journal.bio.bi_inline_vecs, 8); |
cafe5635 | 2000 | |
682811b3 TJ |
2001 | /* |
2002 | * when ca->sb.njournal_buckets is not zero, journal exists, | |
2003 | * and in bch_journal_replay(), tree node may split, | |
2004 | * so bucket of RESERVE_BTREE type is needed, | |
2005 | * the worst situation is all journal buckets are valid journal, | |
2006 | * and all the keys need to replay, | |
2007 | * so the number of RESERVE_BTREE type buckets should be as much | |
2008 | * as journal buckets | |
2009 | */ | |
2010 | btree_buckets = ca->sb.njournal_buckets ?: 8; | |
78365411 | 2011 | free = roundup_pow_of_two(ca->sb.nbuckets) >> 10; |
cafe5635 | 2012 | |
682811b3 | 2013 | if (!init_fifo(&ca->free[RESERVE_BTREE], btree_buckets, GFP_KERNEL) || |
acc9cf8c | 2014 | !init_fifo_exact(&ca->free[RESERVE_PRIO], prio_buckets(ca), GFP_KERNEL) || |
78365411 KO |
2015 | !init_fifo(&ca->free[RESERVE_MOVINGGC], free, GFP_KERNEL) || |
2016 | !init_fifo(&ca->free[RESERVE_NONE], free, GFP_KERNEL) || | |
cafe5635 | 2017 | !init_fifo(&ca->free_inc, free << 2, GFP_KERNEL) || |
cafe5635 | 2018 | !init_heap(&ca->heap, free << 3, GFP_KERNEL) || |
f59fce84 | 2019 | !(ca->buckets = vzalloc(sizeof(struct bucket) * |
cafe5635 KO |
2020 | ca->sb.nbuckets)) || |
2021 | !(ca->prio_buckets = kzalloc(sizeof(uint64_t) * prio_buckets(ca) * | |
2022 | 2, GFP_KERNEL)) || | |
749b61da | 2023 | !(ca->disk_buckets = alloc_bucket_pages(GFP_KERNEL, ca))) |
f59fce84 | 2024 | return -ENOMEM; |
cafe5635 KO |
2025 | |
2026 | ca->prio_last_buckets = ca->prio_buckets + prio_buckets(ca); | |
2027 | ||
cafe5635 KO |
2028 | for_each_bucket(b, ca) |
2029 | atomic_set(&b->pin, 0); | |
2030 | ||
cafe5635 | 2031 | return 0; |
cafe5635 KO |
2032 | } |
2033 | ||
9b299728 | 2034 | static int register_cache(struct cache_sb *sb, struct page *sb_page, |
c9a78332 | 2035 | struct block_device *bdev, struct cache *ca) |
cafe5635 | 2036 | { |
d9dc1702 | 2037 | const char *err = NULL; /* must be set for any error case */ |
9b299728 | 2038 | int ret = 0; |
cafe5635 | 2039 | |
6e916a7e | 2040 | bdevname(bdev, ca->cache_dev_name); |
f59fce84 | 2041 | memcpy(&ca->sb, sb, sizeof(struct cache_sb)); |
cafe5635 KO |
2042 | ca->bdev = bdev; |
2043 | ca->bdev->bd_holder = ca; | |
2044 | ||
3a83f467 | 2045 | bio_init(&ca->sb_bio, ca->sb_bio.bi_inline_vecs, 1); |
263663cd | 2046 | bio_first_bvec_all(&ca->sb_bio)->bv_page = sb_page; |
f59fce84 KO |
2047 | get_page(sb_page); |
2048 | ||
cc40daf9 | 2049 | if (blk_queue_discard(bdev_get_queue(bdev))) |
cafe5635 KO |
2050 | ca->discard = CACHE_DISCARD(&ca->sb); |
2051 | ||
c50d4d5d | 2052 | ret = cache_alloc(ca); |
d9dc1702 | 2053 | if (ret != 0) { |
cc40daf9 | 2054 | blkdev_put(bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL); |
d9dc1702 EW |
2055 | if (ret == -ENOMEM) |
2056 | err = "cache_alloc(): -ENOMEM"; | |
2057 | else | |
2058 | err = "cache_alloc(): unknown error"; | |
f59fce84 | 2059 | goto err; |
d9dc1702 | 2060 | } |
f59fce84 | 2061 | |
9b299728 EW |
2062 | if (kobject_add(&ca->kobj, &part_to_dev(bdev->bd_part)->kobj, "bcache")) { |
2063 | err = "error calling kobject_add"; | |
2064 | ret = -ENOMEM; | |
2065 | goto out; | |
2066 | } | |
cafe5635 | 2067 | |
4fa03402 | 2068 | mutex_lock(&bch_register_lock); |
cafe5635 | 2069 | err = register_cache_set(ca); |
4fa03402 KO |
2070 | mutex_unlock(&bch_register_lock); |
2071 | ||
9b299728 EW |
2072 | if (err) { |
2073 | ret = -ENODEV; | |
2074 | goto out; | |
2075 | } | |
cafe5635 | 2076 | |
6e916a7e | 2077 | pr_info("registered cache device %s", ca->cache_dev_name); |
9b299728 | 2078 | |
d83353b3 KO |
2079 | out: |
2080 | kobject_put(&ca->kobj); | |
9b299728 | 2081 | |
cafe5635 | 2082 | err: |
9b299728 | 2083 | if (err) |
6e916a7e | 2084 | pr_notice("error %s: %s", ca->cache_dev_name, err); |
9b299728 EW |
2085 | |
2086 | return ret; | |
cafe5635 KO |
2087 | } |
2088 | ||
2089 | /* Global interfaces/init */ | |
2090 | ||
2091 | static ssize_t register_bcache(struct kobject *, struct kobj_attribute *, | |
2092 | const char *, size_t); | |
2093 | ||
2094 | kobj_attribute_write(register, register_bcache); | |
2095 | kobj_attribute_write(register_quiet, register_bcache); | |
2096 | ||
a9dd53ad GP |
2097 | static bool bch_is_open_backing(struct block_device *bdev) { |
2098 | struct cache_set *c, *tc; | |
2099 | struct cached_dev *dc, *t; | |
2100 | ||
2101 | list_for_each_entry_safe(c, tc, &bch_cache_sets, list) | |
2102 | list_for_each_entry_safe(dc, t, &c->cached_devs, list) | |
2103 | if (dc->bdev == bdev) | |
2104 | return true; | |
2105 | list_for_each_entry_safe(dc, t, &uncached_devices, list) | |
2106 | if (dc->bdev == bdev) | |
2107 | return true; | |
2108 | return false; | |
2109 | } | |
2110 | ||
2111 | static bool bch_is_open_cache(struct block_device *bdev) { | |
2112 | struct cache_set *c, *tc; | |
2113 | struct cache *ca; | |
2114 | unsigned i; | |
2115 | ||
2116 | list_for_each_entry_safe(c, tc, &bch_cache_sets, list) | |
2117 | for_each_cache(ca, c, i) | |
2118 | if (ca->bdev == bdev) | |
2119 | return true; | |
2120 | return false; | |
2121 | } | |
2122 | ||
2123 | static bool bch_is_open(struct block_device *bdev) { | |
2124 | return bch_is_open_cache(bdev) || bch_is_open_backing(bdev); | |
2125 | } | |
2126 | ||
cafe5635 KO |
2127 | static ssize_t register_bcache(struct kobject *k, struct kobj_attribute *attr, |
2128 | const char *buffer, size_t size) | |
2129 | { | |
2130 | ssize_t ret = size; | |
2131 | const char *err = "cannot allocate memory"; | |
2132 | char *path = NULL; | |
2133 | struct cache_sb *sb = NULL; | |
2134 | struct block_device *bdev = NULL; | |
2135 | struct page *sb_page = NULL; | |
2136 | ||
2137 | if (!try_module_get(THIS_MODULE)) | |
2138 | return -EBUSY; | |
2139 | ||
cafe5635 KO |
2140 | if (!(path = kstrndup(buffer, size, GFP_KERNEL)) || |
2141 | !(sb = kmalloc(sizeof(struct cache_sb), GFP_KERNEL))) | |
2142 | goto err; | |
2143 | ||
2144 | err = "failed to open device"; | |
2145 | bdev = blkdev_get_by_path(strim(path), | |
2146 | FMODE_READ|FMODE_WRITE|FMODE_EXCL, | |
2147 | sb); | |
f59fce84 | 2148 | if (IS_ERR(bdev)) { |
a9dd53ad GP |
2149 | if (bdev == ERR_PTR(-EBUSY)) { |
2150 | bdev = lookup_bdev(strim(path)); | |
789d21db | 2151 | mutex_lock(&bch_register_lock); |
a9dd53ad GP |
2152 | if (!IS_ERR(bdev) && bch_is_open(bdev)) |
2153 | err = "device already registered"; | |
2154 | else | |
2155 | err = "device busy"; | |
789d21db | 2156 | mutex_unlock(&bch_register_lock); |
4b758df2 JK |
2157 | if (!IS_ERR(bdev)) |
2158 | bdput(bdev); | |
d7076f21 GP |
2159 | if (attr == &ksysfs_register_quiet) |
2160 | goto out; | |
a9dd53ad | 2161 | } |
cafe5635 | 2162 | goto err; |
f59fce84 KO |
2163 | } |
2164 | ||
2165 | err = "failed to set blocksize"; | |
2166 | if (set_blocksize(bdev, 4096)) | |
2167 | goto err_close; | |
cafe5635 KO |
2168 | |
2169 | err = read_super(sb, bdev, &sb_page); | |
2170 | if (err) | |
2171 | goto err_close; | |
2172 | ||
cc40daf9 | 2173 | err = "failed to register device"; |
2903381f | 2174 | if (SB_IS_BDEV(sb)) { |
cafe5635 | 2175 | struct cached_dev *dc = kzalloc(sizeof(*dc), GFP_KERNEL); |
f59fce84 KO |
2176 | if (!dc) |
2177 | goto err_close; | |
cafe5635 | 2178 | |
4fa03402 | 2179 | mutex_lock(&bch_register_lock); |
f59fce84 | 2180 | register_bdev(sb, sb_page, bdev, dc); |
4fa03402 | 2181 | mutex_unlock(&bch_register_lock); |
cafe5635 KO |
2182 | } else { |
2183 | struct cache *ca = kzalloc(sizeof(*ca), GFP_KERNEL); | |
f59fce84 KO |
2184 | if (!ca) |
2185 | goto err_close; | |
cafe5635 | 2186 | |
9b299728 | 2187 | if (register_cache(sb, sb_page, bdev, ca) != 0) |
cc40daf9 | 2188 | goto err; |
cafe5635 | 2189 | } |
f59fce84 KO |
2190 | out: |
2191 | if (sb_page) | |
cafe5635 | 2192 | put_page(sb_page); |
cafe5635 KO |
2193 | kfree(sb); |
2194 | kfree(path); | |
cafe5635 KO |
2195 | module_put(THIS_MODULE); |
2196 | return ret; | |
f59fce84 KO |
2197 | |
2198 | err_close: | |
2199 | blkdev_put(bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL); | |
2200 | err: | |
cc40daf9 | 2201 | pr_info("error %s: %s", path, err); |
f59fce84 KO |
2202 | ret = -EINVAL; |
2203 | goto out; | |
cafe5635 KO |
2204 | } |
2205 | ||
2206 | static int bcache_reboot(struct notifier_block *n, unsigned long code, void *x) | |
2207 | { | |
2208 | if (code == SYS_DOWN || | |
2209 | code == SYS_HALT || | |
2210 | code == SYS_POWER_OFF) { | |
2211 | DEFINE_WAIT(wait); | |
2212 | unsigned long start = jiffies; | |
2213 | bool stopped = false; | |
2214 | ||
2215 | struct cache_set *c, *tc; | |
2216 | struct cached_dev *dc, *tdc; | |
2217 | ||
2218 | mutex_lock(&bch_register_lock); | |
2219 | ||
2220 | if (list_empty(&bch_cache_sets) && | |
2221 | list_empty(&uncached_devices)) | |
2222 | goto out; | |
2223 | ||
2224 | pr_info("Stopping all devices:"); | |
2225 | ||
2226 | list_for_each_entry_safe(c, tc, &bch_cache_sets, list) | |
2227 | bch_cache_set_stop(c); | |
2228 | ||
2229 | list_for_each_entry_safe(dc, tdc, &uncached_devices, list) | |
2230 | bcache_device_stop(&dc->disk); | |
2231 | ||
2232 | /* What's a condition variable? */ | |
2233 | while (1) { | |
2234 | long timeout = start + 2 * HZ - jiffies; | |
2235 | ||
2236 | stopped = list_empty(&bch_cache_sets) && | |
2237 | list_empty(&uncached_devices); | |
2238 | ||
2239 | if (timeout < 0 || stopped) | |
2240 | break; | |
2241 | ||
2242 | prepare_to_wait(&unregister_wait, &wait, | |
2243 | TASK_UNINTERRUPTIBLE); | |
2244 | ||
2245 | mutex_unlock(&bch_register_lock); | |
2246 | schedule_timeout(timeout); | |
2247 | mutex_lock(&bch_register_lock); | |
2248 | } | |
2249 | ||
2250 | finish_wait(&unregister_wait, &wait); | |
2251 | ||
2252 | if (stopped) | |
2253 | pr_info("All devices stopped"); | |
2254 | else | |
2255 | pr_notice("Timeout waiting for devices to be closed"); | |
2256 | out: | |
2257 | mutex_unlock(&bch_register_lock); | |
2258 | } | |
2259 | ||
2260 | return NOTIFY_DONE; | |
2261 | } | |
2262 | ||
2263 | static struct notifier_block reboot = { | |
2264 | .notifier_call = bcache_reboot, | |
2265 | .priority = INT_MAX, /* before any real devices */ | |
2266 | }; | |
2267 | ||
2268 | static void bcache_exit(void) | |
2269 | { | |
2270 | bch_debug_exit(); | |
cafe5635 | 2271 | bch_request_exit(); |
cafe5635 KO |
2272 | if (bcache_kobj) |
2273 | kobject_put(bcache_kobj); | |
2274 | if (bcache_wq) | |
2275 | destroy_workqueue(bcache_wq); | |
5c41c8a7 KO |
2276 | if (bcache_major) |
2277 | unregister_blkdev(bcache_major, "bcache"); | |
cafe5635 | 2278 | unregister_reboot_notifier(&reboot); |
330a4db8 | 2279 | mutex_destroy(&bch_register_lock); |
cafe5635 KO |
2280 | } |
2281 | ||
2282 | static int __init bcache_init(void) | |
2283 | { | |
2284 | static const struct attribute *files[] = { | |
2285 | &ksysfs_register.attr, | |
2286 | &ksysfs_register_quiet.attr, | |
2287 | NULL | |
2288 | }; | |
2289 | ||
2290 | mutex_init(&bch_register_lock); | |
2291 | init_waitqueue_head(&unregister_wait); | |
2292 | register_reboot_notifier(&reboot); | |
2293 | ||
2294 | bcache_major = register_blkdev(0, "bcache"); | |
2ecf0cdb ZL |
2295 | if (bcache_major < 0) { |
2296 | unregister_reboot_notifier(&reboot); | |
330a4db8 | 2297 | mutex_destroy(&bch_register_lock); |
cafe5635 | 2298 | return bcache_major; |
2ecf0cdb | 2299 | } |
cafe5635 | 2300 | |
81baf90a | 2301 | if (!(bcache_wq = alloc_workqueue("bcache", WQ_MEM_RECLAIM, 0)) || |
cafe5635 | 2302 | !(bcache_kobj = kobject_create_and_add("bcache", fs_kobj)) || |
cafe5635 | 2303 | bch_request_init() || |
df2b9431 | 2304 | bch_debug_init(bcache_kobj) || closure_debug_init() || |
330a4db8 | 2305 | sysfs_create_files(bcache_kobj, files)) |
cafe5635 KO |
2306 | goto err; |
2307 | ||
2308 | return 0; | |
2309 | err: | |
2310 | bcache_exit(); | |
2311 | return -ENOMEM; | |
2312 | } | |
2313 | ||
2314 | module_exit(bcache_exit); | |
2315 | module_init(bcache_init); |