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 | ||
cafe5635 KO |
50 | static struct kobject *bcache_kobj; |
51 | struct mutex bch_register_lock; | |
52 | LIST_HEAD(bch_cache_sets); | |
53 | static LIST_HEAD(uncached_devices); | |
54 | ||
28935ab5 | 55 | static int bcache_major; |
1dbe32ad | 56 | static DEFINE_IDA(bcache_device_idx); |
cafe5635 KO |
57 | static wait_queue_head_t unregister_wait; |
58 | struct workqueue_struct *bcache_wq; | |
59 | ||
60 | #define BTREE_MAX_PAGES (256 * 1024 / PAGE_SIZE) | |
1dbe32ad CL |
61 | /* limitation of partitions number on single bcache device */ |
62 | #define BCACHE_MINORS 128 | |
63 | /* limitation of bcache devices number on single system */ | |
64 | #define BCACHE_DEVICE_IDX_MAX ((1U << MINORBITS)/BCACHE_MINORS) | |
cafe5635 | 65 | |
cafe5635 KO |
66 | /* Superblock */ |
67 | ||
68 | static const char *read_super(struct cache_sb *sb, struct block_device *bdev, | |
69 | struct page **res) | |
70 | { | |
71 | const char *err; | |
72 | struct cache_sb *s; | |
73 | struct buffer_head *bh = __bread(bdev, 1, SB_SIZE); | |
74 | unsigned i; | |
75 | ||
76 | if (!bh) | |
77 | return "IO error"; | |
78 | ||
79 | s = (struct cache_sb *) bh->b_data; | |
80 | ||
81 | sb->offset = le64_to_cpu(s->offset); | |
82 | sb->version = le64_to_cpu(s->version); | |
83 | ||
84 | memcpy(sb->magic, s->magic, 16); | |
85 | memcpy(sb->uuid, s->uuid, 16); | |
86 | memcpy(sb->set_uuid, s->set_uuid, 16); | |
87 | memcpy(sb->label, s->label, SB_LABEL_SIZE); | |
88 | ||
89 | sb->flags = le64_to_cpu(s->flags); | |
90 | sb->seq = le64_to_cpu(s->seq); | |
cafe5635 | 91 | sb->last_mount = le32_to_cpu(s->last_mount); |
cafe5635 KO |
92 | sb->first_bucket = le16_to_cpu(s->first_bucket); |
93 | sb->keys = le16_to_cpu(s->keys); | |
94 | ||
95 | for (i = 0; i < SB_JOURNAL_BUCKETS; i++) | |
96 | sb->d[i] = le64_to_cpu(s->d[i]); | |
97 | ||
98 | pr_debug("read sb version %llu, flags %llu, seq %llu, journal size %u", | |
99 | sb->version, sb->flags, sb->seq, sb->keys); | |
100 | ||
101 | err = "Not a bcache superblock"; | |
102 | if (sb->offset != SB_SECTOR) | |
103 | goto err; | |
104 | ||
105 | if (memcmp(sb->magic, bcache_magic, 16)) | |
106 | goto err; | |
107 | ||
108 | err = "Too many journal buckets"; | |
109 | if (sb->keys > SB_JOURNAL_BUCKETS) | |
110 | goto err; | |
111 | ||
112 | err = "Bad checksum"; | |
113 | if (s->csum != csum_set(s)) | |
114 | goto err; | |
115 | ||
116 | err = "Bad UUID"; | |
169ef1cf | 117 | if (bch_is_zero(sb->uuid, 16)) |
cafe5635 KO |
118 | goto err; |
119 | ||
8abb2a5d KO |
120 | sb->block_size = le16_to_cpu(s->block_size); |
121 | ||
122 | err = "Superblock block size smaller than device block size"; | |
123 | if (sb->block_size << 9 < bdev_logical_block_size(bdev)) | |
124 | goto err; | |
125 | ||
2903381f KO |
126 | switch (sb->version) { |
127 | case BCACHE_SB_VERSION_BDEV: | |
2903381f KO |
128 | sb->data_offset = BDEV_DATA_START_DEFAULT; |
129 | break; | |
130 | case BCACHE_SB_VERSION_BDEV_WITH_OFFSET: | |
2903381f KO |
131 | sb->data_offset = le64_to_cpu(s->data_offset); |
132 | ||
133 | err = "Bad data offset"; | |
134 | if (sb->data_offset < BDEV_DATA_START_DEFAULT) | |
135 | goto err; | |
cafe5635 | 136 | |
2903381f KO |
137 | break; |
138 | case BCACHE_SB_VERSION_CDEV: | |
139 | case BCACHE_SB_VERSION_CDEV_WITH_UUID: | |
140 | sb->nbuckets = le64_to_cpu(s->nbuckets); | |
2903381f | 141 | sb->bucket_size = le16_to_cpu(s->bucket_size); |
cafe5635 | 142 | |
2903381f KO |
143 | sb->nr_in_set = le16_to_cpu(s->nr_in_set); |
144 | sb->nr_this_dev = le16_to_cpu(s->nr_this_dev); | |
cafe5635 | 145 | |
2903381f KO |
146 | err = "Too many buckets"; |
147 | if (sb->nbuckets > LONG_MAX) | |
148 | goto err; | |
cafe5635 | 149 | |
2903381f KO |
150 | err = "Not enough buckets"; |
151 | if (sb->nbuckets < 1 << 7) | |
152 | goto err; | |
cafe5635 | 153 | |
2903381f KO |
154 | err = "Bad block/bucket size"; |
155 | if (!is_power_of_2(sb->block_size) || | |
156 | sb->block_size > PAGE_SECTORS || | |
157 | !is_power_of_2(sb->bucket_size) || | |
158 | sb->bucket_size < PAGE_SECTORS) | |
159 | goto err; | |
cafe5635 | 160 | |
2903381f KO |
161 | err = "Invalid superblock: device too small"; |
162 | if (get_capacity(bdev->bd_disk) < sb->bucket_size * sb->nbuckets) | |
163 | goto err; | |
cafe5635 | 164 | |
2903381f KO |
165 | err = "Bad UUID"; |
166 | if (bch_is_zero(sb->set_uuid, 16)) | |
167 | goto err; | |
cafe5635 | 168 | |
2903381f KO |
169 | err = "Bad cache device number in set"; |
170 | if (!sb->nr_in_set || | |
171 | sb->nr_in_set <= sb->nr_this_dev || | |
172 | sb->nr_in_set > MAX_CACHES_PER_SET) | |
cafe5635 KO |
173 | goto err; |
174 | ||
2903381f KO |
175 | err = "Journal buckets not sequential"; |
176 | for (i = 0; i < sb->keys; i++) | |
177 | if (sb->d[i] != sb->first_bucket + i) | |
178 | goto err; | |
cafe5635 | 179 | |
2903381f KO |
180 | err = "Too many journal buckets"; |
181 | if (sb->first_bucket + sb->keys > sb->nbuckets) | |
182 | goto err; | |
183 | ||
184 | err = "Invalid superblock: first bucket comes before end of super"; | |
185 | if (sb->first_bucket * sb->bucket_size < 16) | |
186 | goto err; | |
187 | ||
188 | break; | |
189 | default: | |
190 | err = "Unsupported superblock version"; | |
cafe5635 | 191 | goto err; |
2903381f KO |
192 | } |
193 | ||
cafe5635 KO |
194 | sb->last_mount = get_seconds(); |
195 | err = NULL; | |
196 | ||
197 | get_page(bh->b_page); | |
198 | *res = bh->b_page; | |
199 | err: | |
200 | put_bh(bh); | |
201 | return err; | |
202 | } | |
203 | ||
4246a0b6 | 204 | static void write_bdev_super_endio(struct bio *bio) |
cafe5635 KO |
205 | { |
206 | struct cached_dev *dc = bio->bi_private; | |
207 | /* XXX: error checking */ | |
208 | ||
cb7a583e | 209 | closure_put(&dc->sb_write); |
cafe5635 KO |
210 | } |
211 | ||
212 | static void __write_super(struct cache_sb *sb, struct bio *bio) | |
213 | { | |
263663cd | 214 | struct cache_sb *out = page_address(bio_first_page_all(bio)); |
cafe5635 KO |
215 | unsigned i; |
216 | ||
4f024f37 | 217 | bio->bi_iter.bi_sector = SB_SECTOR; |
4f024f37 | 218 | bio->bi_iter.bi_size = SB_SIZE; |
ad0d9e76 | 219 | bio_set_op_attrs(bio, REQ_OP_WRITE, REQ_SYNC|REQ_META); |
169ef1cf | 220 | bch_bio_map(bio, NULL); |
cafe5635 KO |
221 | |
222 | out->offset = cpu_to_le64(sb->offset); | |
223 | out->version = cpu_to_le64(sb->version); | |
224 | ||
225 | memcpy(out->uuid, sb->uuid, 16); | |
226 | memcpy(out->set_uuid, sb->set_uuid, 16); | |
227 | memcpy(out->label, sb->label, SB_LABEL_SIZE); | |
228 | ||
229 | out->flags = cpu_to_le64(sb->flags); | |
230 | out->seq = cpu_to_le64(sb->seq); | |
231 | ||
232 | out->last_mount = cpu_to_le32(sb->last_mount); | |
233 | out->first_bucket = cpu_to_le16(sb->first_bucket); | |
234 | out->keys = cpu_to_le16(sb->keys); | |
235 | ||
236 | for (i = 0; i < sb->keys; i++) | |
237 | out->d[i] = cpu_to_le64(sb->d[i]); | |
238 | ||
239 | out->csum = csum_set(out); | |
240 | ||
241 | pr_debug("ver %llu, flags %llu, seq %llu", | |
242 | sb->version, sb->flags, sb->seq); | |
243 | ||
4e49ea4a | 244 | submit_bio(bio); |
cafe5635 KO |
245 | } |
246 | ||
cb7a583e KO |
247 | static void bch_write_bdev_super_unlock(struct closure *cl) |
248 | { | |
249 | struct cached_dev *dc = container_of(cl, struct cached_dev, sb_write); | |
250 | ||
251 | up(&dc->sb_write_mutex); | |
252 | } | |
253 | ||
cafe5635 KO |
254 | void bch_write_bdev_super(struct cached_dev *dc, struct closure *parent) |
255 | { | |
cb7a583e | 256 | struct closure *cl = &dc->sb_write; |
cafe5635 KO |
257 | struct bio *bio = &dc->sb_bio; |
258 | ||
cb7a583e KO |
259 | down(&dc->sb_write_mutex); |
260 | closure_init(cl, parent); | |
cafe5635 KO |
261 | |
262 | bio_reset(bio); | |
74d46992 | 263 | bio_set_dev(bio, dc->bdev); |
cafe5635 KO |
264 | bio->bi_end_io = write_bdev_super_endio; |
265 | bio->bi_private = dc; | |
266 | ||
267 | closure_get(cl); | |
268 | __write_super(&dc->sb, bio); | |
269 | ||
cb7a583e | 270 | closure_return_with_destructor(cl, bch_write_bdev_super_unlock); |
cafe5635 KO |
271 | } |
272 | ||
4246a0b6 | 273 | static void write_super_endio(struct bio *bio) |
cafe5635 KO |
274 | { |
275 | struct cache *ca = bio->bi_private; | |
276 | ||
5138ac67 CL |
277 | /* is_read = 0 */ |
278 | bch_count_io_errors(ca, bio->bi_status, 0, | |
279 | "writing superblock"); | |
cb7a583e KO |
280 | closure_put(&ca->set->sb_write); |
281 | } | |
282 | ||
283 | static void bcache_write_super_unlock(struct closure *cl) | |
284 | { | |
285 | struct cache_set *c = container_of(cl, struct cache_set, sb_write); | |
286 | ||
287 | up(&c->sb_write_mutex); | |
cafe5635 KO |
288 | } |
289 | ||
290 | void bcache_write_super(struct cache_set *c) | |
291 | { | |
cb7a583e | 292 | struct closure *cl = &c->sb_write; |
cafe5635 KO |
293 | struct cache *ca; |
294 | unsigned i; | |
295 | ||
cb7a583e KO |
296 | down(&c->sb_write_mutex); |
297 | closure_init(cl, &c->cl); | |
cafe5635 KO |
298 | |
299 | c->sb.seq++; | |
300 | ||
301 | for_each_cache(ca, c, i) { | |
302 | struct bio *bio = &ca->sb_bio; | |
303 | ||
2903381f | 304 | ca->sb.version = BCACHE_SB_VERSION_CDEV_WITH_UUID; |
cafe5635 KO |
305 | ca->sb.seq = c->sb.seq; |
306 | ca->sb.last_mount = c->sb.last_mount; | |
307 | ||
308 | SET_CACHE_SYNC(&ca->sb, CACHE_SYNC(&c->sb)); | |
309 | ||
310 | bio_reset(bio); | |
74d46992 | 311 | bio_set_dev(bio, ca->bdev); |
cafe5635 KO |
312 | bio->bi_end_io = write_super_endio; |
313 | bio->bi_private = ca; | |
314 | ||
315 | closure_get(cl); | |
316 | __write_super(&ca->sb, bio); | |
317 | } | |
318 | ||
cb7a583e | 319 | closure_return_with_destructor(cl, bcache_write_super_unlock); |
cafe5635 KO |
320 | } |
321 | ||
322 | /* UUID io */ | |
323 | ||
4246a0b6 | 324 | static void uuid_endio(struct bio *bio) |
cafe5635 KO |
325 | { |
326 | struct closure *cl = bio->bi_private; | |
cb7a583e | 327 | struct cache_set *c = container_of(cl, struct cache_set, uuid_write); |
cafe5635 | 328 | |
4e4cbee9 | 329 | cache_set_err_on(bio->bi_status, c, "accessing uuids"); |
cafe5635 KO |
330 | bch_bbio_free(bio, c); |
331 | closure_put(cl); | |
332 | } | |
333 | ||
cb7a583e KO |
334 | static void uuid_io_unlock(struct closure *cl) |
335 | { | |
336 | struct cache_set *c = container_of(cl, struct cache_set, uuid_write); | |
337 | ||
338 | up(&c->uuid_write_mutex); | |
339 | } | |
340 | ||
ad0d9e76 | 341 | static void uuid_io(struct cache_set *c, int op, unsigned long op_flags, |
cafe5635 KO |
342 | struct bkey *k, struct closure *parent) |
343 | { | |
cb7a583e | 344 | struct closure *cl = &c->uuid_write; |
cafe5635 KO |
345 | struct uuid_entry *u; |
346 | unsigned i; | |
85b1492e | 347 | char buf[80]; |
cafe5635 KO |
348 | |
349 | BUG_ON(!parent); | |
cb7a583e KO |
350 | down(&c->uuid_write_mutex); |
351 | closure_init(cl, parent); | |
cafe5635 KO |
352 | |
353 | for (i = 0; i < KEY_PTRS(k); i++) { | |
354 | struct bio *bio = bch_bbio_alloc(c); | |
355 | ||
1eff9d32 | 356 | bio->bi_opf = REQ_SYNC | REQ_META | op_flags; |
4f024f37 | 357 | bio->bi_iter.bi_size = KEY_SIZE(k) << 9; |
cafe5635 KO |
358 | |
359 | bio->bi_end_io = uuid_endio; | |
360 | bio->bi_private = cl; | |
ad0d9e76 | 361 | bio_set_op_attrs(bio, op, REQ_SYNC|REQ_META|op_flags); |
169ef1cf | 362 | bch_bio_map(bio, c->uuids); |
cafe5635 KO |
363 | |
364 | bch_submit_bbio(bio, c, k, i); | |
365 | ||
ad0d9e76 | 366 | if (op != REQ_OP_WRITE) |
cafe5635 KO |
367 | break; |
368 | } | |
369 | ||
dc9d98d6 | 370 | bch_extent_to_text(buf, sizeof(buf), k); |
ad0d9e76 | 371 | pr_debug("%s UUIDs at %s", op == REQ_OP_WRITE ? "wrote" : "read", buf); |
cafe5635 KO |
372 | |
373 | for (u = c->uuids; u < c->uuids + c->nr_uuids; u++) | |
169ef1cf | 374 | if (!bch_is_zero(u->uuid, 16)) |
cafe5635 KO |
375 | pr_debug("Slot %zi: %pU: %s: 1st: %u last: %u inv: %u", |
376 | u - c->uuids, u->uuid, u->label, | |
377 | u->first_reg, u->last_reg, u->invalidated); | |
378 | ||
cb7a583e | 379 | closure_return_with_destructor(cl, uuid_io_unlock); |
cafe5635 KO |
380 | } |
381 | ||
382 | static char *uuid_read(struct cache_set *c, struct jset *j, struct closure *cl) | |
383 | { | |
384 | struct bkey *k = &j->uuid_bucket; | |
385 | ||
65d45231 | 386 | if (__bch_btree_ptr_invalid(c, k)) |
cafe5635 KO |
387 | return "bad uuid pointer"; |
388 | ||
389 | bkey_copy(&c->uuid_bucket, k); | |
70fd7614 | 390 | uuid_io(c, REQ_OP_READ, 0, k, cl); |
cafe5635 KO |
391 | |
392 | if (j->version < BCACHE_JSET_VERSION_UUIDv1) { | |
393 | struct uuid_entry_v0 *u0 = (void *) c->uuids; | |
394 | struct uuid_entry *u1 = (void *) c->uuids; | |
395 | int i; | |
396 | ||
397 | closure_sync(cl); | |
398 | ||
399 | /* | |
400 | * Since the new uuid entry is bigger than the old, we have to | |
401 | * convert starting at the highest memory address and work down | |
402 | * in order to do it in place | |
403 | */ | |
404 | ||
405 | for (i = c->nr_uuids - 1; | |
406 | i >= 0; | |
407 | --i) { | |
408 | memcpy(u1[i].uuid, u0[i].uuid, 16); | |
409 | memcpy(u1[i].label, u0[i].label, 32); | |
410 | ||
411 | u1[i].first_reg = u0[i].first_reg; | |
412 | u1[i].last_reg = u0[i].last_reg; | |
413 | u1[i].invalidated = u0[i].invalidated; | |
414 | ||
415 | u1[i].flags = 0; | |
416 | u1[i].sectors = 0; | |
417 | } | |
418 | } | |
419 | ||
420 | return NULL; | |
421 | } | |
422 | ||
423 | static int __uuid_write(struct cache_set *c) | |
424 | { | |
425 | BKEY_PADDED(key) k; | |
426 | struct closure cl; | |
427 | closure_init_stack(&cl); | |
428 | ||
429 | lockdep_assert_held(&bch_register_lock); | |
430 | ||
78365411 | 431 | if (bch_bucket_alloc_set(c, RESERVE_BTREE, &k.key, 1, true)) |
cafe5635 KO |
432 | return 1; |
433 | ||
434 | SET_KEY_SIZE(&k.key, c->sb.bucket_size); | |
ad0d9e76 | 435 | uuid_io(c, REQ_OP_WRITE, 0, &k.key, &cl); |
cafe5635 KO |
436 | closure_sync(&cl); |
437 | ||
438 | bkey_copy(&c->uuid_bucket, &k.key); | |
3a3b6a4e | 439 | bkey_put(c, &k.key); |
cafe5635 KO |
440 | return 0; |
441 | } | |
442 | ||
443 | int bch_uuid_write(struct cache_set *c) | |
444 | { | |
445 | int ret = __uuid_write(c); | |
446 | ||
447 | if (!ret) | |
448 | bch_journal_meta(c, NULL); | |
449 | ||
450 | return ret; | |
451 | } | |
452 | ||
453 | static struct uuid_entry *uuid_find(struct cache_set *c, const char *uuid) | |
454 | { | |
455 | struct uuid_entry *u; | |
456 | ||
457 | for (u = c->uuids; | |
458 | u < c->uuids + c->nr_uuids; u++) | |
459 | if (!memcmp(u->uuid, uuid, 16)) | |
460 | return u; | |
461 | ||
462 | return NULL; | |
463 | } | |
464 | ||
465 | static struct uuid_entry *uuid_find_empty(struct cache_set *c) | |
466 | { | |
467 | static const char zero_uuid[16] = "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"; | |
468 | return uuid_find(c, zero_uuid); | |
469 | } | |
470 | ||
471 | /* | |
472 | * Bucket priorities/gens: | |
473 | * | |
474 | * For each bucket, we store on disk its | |
475 | * 8 bit gen | |
476 | * 16 bit priority | |
477 | * | |
478 | * See alloc.c for an explanation of the gen. The priority is used to implement | |
479 | * lru (and in the future other) cache replacement policies; for most purposes | |
480 | * it's just an opaque integer. | |
481 | * | |
482 | * The gens and the priorities don't have a whole lot to do with each other, and | |
483 | * it's actually the gens that must be written out at specific times - it's no | |
484 | * big deal if the priorities don't get written, if we lose them we just reuse | |
485 | * buckets in suboptimal order. | |
486 | * | |
487 | * On disk they're stored in a packed array, and in as many buckets are required | |
488 | * to fit them all. The buckets we use to store them form a list; the journal | |
489 | * header points to the first bucket, the first bucket points to the second | |
490 | * bucket, et cetera. | |
491 | * | |
492 | * This code is used by the allocation code; periodically (whenever it runs out | |
493 | * of buckets to allocate from) the allocation code will invalidate some | |
494 | * buckets, but it can't use those buckets until their new gens are safely on | |
495 | * disk. | |
496 | */ | |
497 | ||
4246a0b6 | 498 | static void prio_endio(struct bio *bio) |
cafe5635 KO |
499 | { |
500 | struct cache *ca = bio->bi_private; | |
501 | ||
4e4cbee9 | 502 | cache_set_err_on(bio->bi_status, ca->set, "accessing priorities"); |
cafe5635 KO |
503 | bch_bbio_free(bio, ca->set); |
504 | closure_put(&ca->prio); | |
505 | } | |
506 | ||
ad0d9e76 MC |
507 | static void prio_io(struct cache *ca, uint64_t bucket, int op, |
508 | unsigned long op_flags) | |
cafe5635 KO |
509 | { |
510 | struct closure *cl = &ca->prio; | |
511 | struct bio *bio = bch_bbio_alloc(ca->set); | |
512 | ||
513 | closure_init_stack(cl); | |
514 | ||
4f024f37 | 515 | bio->bi_iter.bi_sector = bucket * ca->sb.bucket_size; |
74d46992 | 516 | bio_set_dev(bio, ca->bdev); |
4f024f37 | 517 | bio->bi_iter.bi_size = bucket_bytes(ca); |
cafe5635 KO |
518 | |
519 | bio->bi_end_io = prio_endio; | |
520 | bio->bi_private = ca; | |
ad0d9e76 | 521 | bio_set_op_attrs(bio, op, REQ_SYNC|REQ_META|op_flags); |
169ef1cf | 522 | bch_bio_map(bio, ca->disk_buckets); |
cafe5635 | 523 | |
749b61da | 524 | closure_bio_submit(bio, &ca->prio); |
cafe5635 KO |
525 | closure_sync(cl); |
526 | } | |
527 | ||
cafe5635 KO |
528 | void bch_prio_write(struct cache *ca) |
529 | { | |
530 | int i; | |
531 | struct bucket *b; | |
532 | struct closure cl; | |
533 | ||
534 | closure_init_stack(&cl); | |
535 | ||
536 | lockdep_assert_held(&ca->set->bucket_lock); | |
537 | ||
cafe5635 KO |
538 | ca->disk_buckets->seq++; |
539 | ||
540 | atomic_long_add(ca->sb.bucket_size * prio_buckets(ca), | |
541 | &ca->meta_sectors_written); | |
542 | ||
78365411 KO |
543 | //pr_debug("free %zu, free_inc %zu, unused %zu", fifo_used(&ca->free), |
544 | // fifo_used(&ca->free_inc), fifo_used(&ca->unused)); | |
cafe5635 KO |
545 | |
546 | for (i = prio_buckets(ca) - 1; i >= 0; --i) { | |
547 | long bucket; | |
548 | struct prio_set *p = ca->disk_buckets; | |
b1a67b0f KO |
549 | struct bucket_disk *d = p->data; |
550 | struct bucket_disk *end = d + prios_per_bucket(ca); | |
cafe5635 KO |
551 | |
552 | for (b = ca->buckets + i * prios_per_bucket(ca); | |
553 | b < ca->buckets + ca->sb.nbuckets && d < end; | |
554 | b++, d++) { | |
555 | d->prio = cpu_to_le16(b->prio); | |
556 | d->gen = b->gen; | |
557 | } | |
558 | ||
559 | p->next_bucket = ca->prio_buckets[i + 1]; | |
81ab4190 | 560 | p->magic = pset_magic(&ca->sb); |
169ef1cf | 561 | p->csum = bch_crc64(&p->magic, bucket_bytes(ca) - 8); |
cafe5635 | 562 | |
78365411 | 563 | bucket = bch_bucket_alloc(ca, RESERVE_PRIO, true); |
cafe5635 KO |
564 | BUG_ON(bucket == -1); |
565 | ||
566 | mutex_unlock(&ca->set->bucket_lock); | |
ad0d9e76 | 567 | prio_io(ca, bucket, REQ_OP_WRITE, 0); |
cafe5635 KO |
568 | mutex_lock(&ca->set->bucket_lock); |
569 | ||
570 | ca->prio_buckets[i] = bucket; | |
571 | atomic_dec_bug(&ca->buckets[bucket].pin); | |
572 | } | |
573 | ||
574 | mutex_unlock(&ca->set->bucket_lock); | |
575 | ||
576 | bch_journal_meta(ca->set, &cl); | |
577 | closure_sync(&cl); | |
578 | ||
579 | mutex_lock(&ca->set->bucket_lock); | |
580 | ||
cafe5635 KO |
581 | /* |
582 | * Don't want the old priorities to get garbage collected until after we | |
583 | * finish writing the new ones, and they're journalled | |
584 | */ | |
2531d9ee KO |
585 | for (i = 0; i < prio_buckets(ca); i++) { |
586 | if (ca->prio_last_buckets[i]) | |
587 | __bch_bucket_free(ca, | |
588 | &ca->buckets[ca->prio_last_buckets[i]]); | |
589 | ||
cafe5635 | 590 | ca->prio_last_buckets[i] = ca->prio_buckets[i]; |
2531d9ee | 591 | } |
cafe5635 KO |
592 | } |
593 | ||
594 | static void prio_read(struct cache *ca, uint64_t bucket) | |
595 | { | |
596 | struct prio_set *p = ca->disk_buckets; | |
597 | struct bucket_disk *d = p->data + prios_per_bucket(ca), *end = d; | |
598 | struct bucket *b; | |
599 | unsigned bucket_nr = 0; | |
600 | ||
601 | for (b = ca->buckets; | |
602 | b < ca->buckets + ca->sb.nbuckets; | |
603 | b++, d++) { | |
604 | if (d == end) { | |
605 | ca->prio_buckets[bucket_nr] = bucket; | |
606 | ca->prio_last_buckets[bucket_nr] = bucket; | |
607 | bucket_nr++; | |
608 | ||
70fd7614 | 609 | prio_io(ca, bucket, REQ_OP_READ, 0); |
cafe5635 | 610 | |
169ef1cf | 611 | if (p->csum != bch_crc64(&p->magic, bucket_bytes(ca) - 8)) |
cafe5635 KO |
612 | pr_warn("bad csum reading priorities"); |
613 | ||
81ab4190 | 614 | if (p->magic != pset_magic(&ca->sb)) |
cafe5635 KO |
615 | pr_warn("bad magic reading priorities"); |
616 | ||
617 | bucket = p->next_bucket; | |
618 | d = p->data; | |
619 | } | |
620 | ||
621 | b->prio = le16_to_cpu(d->prio); | |
3a2fd9d5 | 622 | b->gen = b->last_gc = d->gen; |
cafe5635 KO |
623 | } |
624 | } | |
625 | ||
626 | /* Bcache device */ | |
627 | ||
628 | static int open_dev(struct block_device *b, fmode_t mode) | |
629 | { | |
630 | struct bcache_device *d = b->bd_disk->private_data; | |
c4d951dd | 631 | if (test_bit(BCACHE_DEV_CLOSING, &d->flags)) |
cafe5635 KO |
632 | return -ENXIO; |
633 | ||
634 | closure_get(&d->cl); | |
635 | return 0; | |
636 | } | |
637 | ||
867e1162 | 638 | static void release_dev(struct gendisk *b, fmode_t mode) |
cafe5635 KO |
639 | { |
640 | struct bcache_device *d = b->private_data; | |
641 | closure_put(&d->cl); | |
cafe5635 KO |
642 | } |
643 | ||
644 | static int ioctl_dev(struct block_device *b, fmode_t mode, | |
645 | unsigned int cmd, unsigned long arg) | |
646 | { | |
647 | struct bcache_device *d = b->bd_disk->private_data; | |
648 | return d->ioctl(d, mode, cmd, arg); | |
649 | } | |
650 | ||
651 | static const struct block_device_operations bcache_ops = { | |
652 | .open = open_dev, | |
653 | .release = release_dev, | |
654 | .ioctl = ioctl_dev, | |
655 | .owner = THIS_MODULE, | |
656 | }; | |
657 | ||
658 | void bcache_device_stop(struct bcache_device *d) | |
659 | { | |
c4d951dd | 660 | if (!test_and_set_bit(BCACHE_DEV_CLOSING, &d->flags)) |
cafe5635 KO |
661 | closure_queue(&d->cl); |
662 | } | |
663 | ||
ee668506 KO |
664 | static void bcache_device_unlink(struct bcache_device *d) |
665 | { | |
c4d951dd | 666 | lockdep_assert_held(&bch_register_lock); |
ee668506 | 667 | |
c4d951dd KO |
668 | if (d->c && !test_and_set_bit(BCACHE_DEV_UNLINK_DONE, &d->flags)) { |
669 | unsigned i; | |
670 | struct cache *ca; | |
ee668506 | 671 | |
c4d951dd KO |
672 | sysfs_remove_link(&d->c->kobj, d->name); |
673 | sysfs_remove_link(&d->kobj, "cache"); | |
674 | ||
675 | for_each_cache(ca, d->c, i) | |
676 | bd_unlink_disk_holder(ca->bdev, d->disk); | |
677 | } | |
ee668506 KO |
678 | } |
679 | ||
680 | static void bcache_device_link(struct bcache_device *d, struct cache_set *c, | |
681 | const char *name) | |
682 | { | |
683 | unsigned i; | |
684 | struct cache *ca; | |
685 | ||
686 | for_each_cache(ca, d->c, i) | |
687 | bd_link_disk_holder(ca->bdev, d->disk); | |
688 | ||
689 | snprintf(d->name, BCACHEDEVNAME_SIZE, | |
690 | "%s%u", name, d->id); | |
691 | ||
692 | WARN(sysfs_create_link(&d->kobj, &c->kobj, "cache") || | |
693 | sysfs_create_link(&c->kobj, &d->kobj, d->name), | |
694 | "Couldn't create device <-> cache set symlinks"); | |
fecaee6f ZL |
695 | |
696 | clear_bit(BCACHE_DEV_UNLINK_DONE, &d->flags); | |
ee668506 KO |
697 | } |
698 | ||
cafe5635 KO |
699 | static void bcache_device_detach(struct bcache_device *d) |
700 | { | |
701 | lockdep_assert_held(&bch_register_lock); | |
702 | ||
c4d951dd | 703 | if (test_bit(BCACHE_DEV_DETACHING, &d->flags)) { |
cafe5635 KO |
704 | struct uuid_entry *u = d->c->uuids + d->id; |
705 | ||
706 | SET_UUID_FLASH_ONLY(u, 0); | |
707 | memcpy(u->uuid, invalid_uuid, 16); | |
708 | u->invalidated = cpu_to_le32(get_seconds()); | |
709 | bch_uuid_write(d->c); | |
cafe5635 KO |
710 | } |
711 | ||
c4d951dd | 712 | bcache_device_unlink(d); |
ee668506 | 713 | |
cafe5635 KO |
714 | d->c->devices[d->id] = NULL; |
715 | closure_put(&d->c->caching); | |
716 | d->c = NULL; | |
717 | } | |
718 | ||
719 | static void bcache_device_attach(struct bcache_device *d, struct cache_set *c, | |
720 | unsigned id) | |
721 | { | |
cafe5635 KO |
722 | d->id = id; |
723 | d->c = c; | |
724 | c->devices[id] = d; | |
725 | ||
2831231d CL |
726 | if (id >= c->devices_max_used) |
727 | c->devices_max_used = id + 1; | |
728 | ||
cafe5635 KO |
729 | closure_get(&c->caching); |
730 | } | |
731 | ||
1dbe32ad CL |
732 | static inline int first_minor_to_idx(int first_minor) |
733 | { | |
734 | return (first_minor/BCACHE_MINORS); | |
735 | } | |
736 | ||
737 | static inline int idx_to_first_minor(int idx) | |
738 | { | |
739 | return (idx * BCACHE_MINORS); | |
740 | } | |
741 | ||
cafe5635 KO |
742 | static void bcache_device_free(struct bcache_device *d) |
743 | { | |
744 | lockdep_assert_held(&bch_register_lock); | |
745 | ||
746 | pr_info("%s stopped", d->disk->disk_name); | |
747 | ||
748 | if (d->c) | |
749 | bcache_device_detach(d); | |
f59fce84 | 750 | if (d->disk && d->disk->flags & GENHD_FL_UP) |
cafe5635 KO |
751 | del_gendisk(d->disk); |
752 | if (d->disk && d->disk->queue) | |
753 | blk_cleanup_queue(d->disk->queue); | |
28935ab5 | 754 | if (d->disk) { |
1dbe32ad CL |
755 | ida_simple_remove(&bcache_device_idx, |
756 | first_minor_to_idx(d->disk->first_minor)); | |
cafe5635 | 757 | put_disk(d->disk); |
28935ab5 | 758 | } |
cafe5635 | 759 | |
cafe5635 KO |
760 | if (d->bio_split) |
761 | bioset_free(d->bio_split); | |
958b4338 PE |
762 | kvfree(d->full_dirty_stripes); |
763 | kvfree(d->stripe_sectors_dirty); | |
cafe5635 KO |
764 | |
765 | closure_debug_destroy(&d->cl); | |
766 | } | |
767 | ||
279afbad KO |
768 | static int bcache_device_init(struct bcache_device *d, unsigned block_size, |
769 | sector_t sectors) | |
cafe5635 KO |
770 | { |
771 | struct request_queue *q; | |
279afbad | 772 | size_t n; |
1dbe32ad | 773 | int idx; |
279afbad | 774 | |
2d679fc7 KO |
775 | if (!d->stripe_size) |
776 | d->stripe_size = 1 << 31; | |
279afbad | 777 | |
2d679fc7 | 778 | d->nr_stripes = DIV_ROUND_UP_ULL(sectors, d->stripe_size); |
279afbad | 779 | |
48a915a8 KO |
780 | if (!d->nr_stripes || |
781 | d->nr_stripes > INT_MAX || | |
782 | d->nr_stripes > SIZE_MAX / sizeof(atomic_t)) { | |
90706094 EW |
783 | pr_err("nr_stripes too large or invalid: %u (start sector beyond end of disk?)", |
784 | (unsigned)d->nr_stripes); | |
279afbad | 785 | return -ENOMEM; |
48a915a8 | 786 | } |
279afbad KO |
787 | |
788 | n = d->nr_stripes * sizeof(atomic_t); | |
bc4e54f6 | 789 | d->stripe_sectors_dirty = kvzalloc(n, GFP_KERNEL); |
279afbad KO |
790 | if (!d->stripe_sectors_dirty) |
791 | return -ENOMEM; | |
cafe5635 | 792 | |
48a915a8 | 793 | n = BITS_TO_LONGS(d->nr_stripes) * sizeof(unsigned long); |
bc4e54f6 | 794 | d->full_dirty_stripes = kvzalloc(n, GFP_KERNEL); |
48a915a8 KO |
795 | if (!d->full_dirty_stripes) |
796 | return -ENOMEM; | |
797 | ||
1dbe32ad CL |
798 | idx = ida_simple_get(&bcache_device_idx, 0, |
799 | BCACHE_DEVICE_IDX_MAX, GFP_KERNEL); | |
800 | if (idx < 0) | |
801 | return idx; | |
b8c0d911 | 802 | |
47e0fb46 N |
803 | if (!(d->bio_split = bioset_create(4, offsetof(struct bbio, bio), |
804 | BIOSET_NEED_BVECS | | |
805 | BIOSET_NEED_RESCUER)) || | |
b8c0d911 | 806 | !(d->disk = alloc_disk(BCACHE_MINORS))) { |
1dbe32ad | 807 | ida_simple_remove(&bcache_device_idx, idx); |
cafe5635 | 808 | return -ENOMEM; |
28935ab5 | 809 | } |
cafe5635 | 810 | |
279afbad | 811 | set_capacity(d->disk, sectors); |
1dbe32ad | 812 | snprintf(d->disk->disk_name, DISK_NAME_LEN, "bcache%i", idx); |
cafe5635 KO |
813 | |
814 | d->disk->major = bcache_major; | |
1dbe32ad | 815 | d->disk->first_minor = idx_to_first_minor(idx); |
cafe5635 KO |
816 | d->disk->fops = &bcache_ops; |
817 | d->disk->private_data = d; | |
818 | ||
28935ab5 KO |
819 | q = blk_alloc_queue(GFP_KERNEL); |
820 | if (!q) | |
821 | return -ENOMEM; | |
822 | ||
cafe5635 KO |
823 | blk_queue_make_request(q, NULL); |
824 | d->disk->queue = q; | |
825 | q->queuedata = d; | |
dc3b17cc | 826 | q->backing_dev_info->congested_data = d; |
cafe5635 KO |
827 | q->limits.max_hw_sectors = UINT_MAX; |
828 | q->limits.max_sectors = UINT_MAX; | |
829 | q->limits.max_segment_size = UINT_MAX; | |
830 | q->limits.max_segments = BIO_MAX_PAGES; | |
2bb4cd5c | 831 | blk_queue_max_discard_sectors(q, UINT_MAX); |
90db6919 | 832 | q->limits.discard_granularity = 512; |
cafe5635 KO |
833 | q->limits.io_min = block_size; |
834 | q->limits.logical_block_size = block_size; | |
835 | q->limits.physical_block_size = block_size; | |
836 | set_bit(QUEUE_FLAG_NONROT, &d->disk->queue->queue_flags); | |
b277da0a | 837 | clear_bit(QUEUE_FLAG_ADD_RANDOM, &d->disk->queue->queue_flags); |
cafe5635 KO |
838 | set_bit(QUEUE_FLAG_DISCARD, &d->disk->queue->queue_flags); |
839 | ||
84b4ff9e | 840 | blk_queue_write_cache(q, true, true); |
54d12f2b | 841 | |
cafe5635 KO |
842 | return 0; |
843 | } | |
844 | ||
845 | /* Cached device */ | |
846 | ||
847 | static void calc_cached_dev_sectors(struct cache_set *c) | |
848 | { | |
849 | uint64_t sectors = 0; | |
850 | struct cached_dev *dc; | |
851 | ||
852 | list_for_each_entry(dc, &c->cached_devs, list) | |
853 | sectors += bdev_sectors(dc->bdev); | |
854 | ||
855 | c->cached_dev_sectors = sectors; | |
856 | } | |
857 | ||
858 | void bch_cached_dev_run(struct cached_dev *dc) | |
859 | { | |
860 | struct bcache_device *d = &dc->disk; | |
ab9e1400 | 861 | char buf[SB_LABEL_SIZE + 1]; |
a25c32be GP |
862 | char *env[] = { |
863 | "DRIVER=bcache", | |
864 | kasprintf(GFP_KERNEL, "CACHED_UUID=%pU", dc->sb.uuid), | |
ab9e1400 GP |
865 | NULL, |
866 | NULL, | |
a25c32be | 867 | }; |
cafe5635 | 868 | |
ab9e1400 GP |
869 | memcpy(buf, dc->sb.label, SB_LABEL_SIZE); |
870 | buf[SB_LABEL_SIZE] = '\0'; | |
871 | env[2] = kasprintf(GFP_KERNEL, "CACHED_LABEL=%s", buf); | |
872 | ||
4d4d8573 AV |
873 | if (atomic_xchg(&dc->running, 1)) { |
874 | kfree(env[1]); | |
875 | kfree(env[2]); | |
cafe5635 | 876 | return; |
4d4d8573 | 877 | } |
cafe5635 KO |
878 | |
879 | if (!d->c && | |
880 | BDEV_STATE(&dc->sb) != BDEV_STATE_NONE) { | |
881 | struct closure cl; | |
882 | closure_init_stack(&cl); | |
883 | ||
884 | SET_BDEV_STATE(&dc->sb, BDEV_STATE_STALE); | |
885 | bch_write_bdev_super(dc, &cl); | |
886 | closure_sync(&cl); | |
887 | } | |
888 | ||
889 | add_disk(d->disk); | |
ee668506 | 890 | bd_link_disk_holder(dc->bdev, dc->disk.disk); |
a25c32be GP |
891 | /* won't show up in the uevent file, use udevadm monitor -e instead |
892 | * only class / kset properties are persistent */ | |
cafe5635 | 893 | kobject_uevent_env(&disk_to_dev(d->disk)->kobj, KOBJ_CHANGE, env); |
a25c32be | 894 | kfree(env[1]); |
ab9e1400 | 895 | kfree(env[2]); |
a25c32be | 896 | |
cafe5635 KO |
897 | if (sysfs_create_link(&d->kobj, &disk_to_dev(d->disk)->kobj, "dev") || |
898 | sysfs_create_link(&disk_to_dev(d->disk)->kobj, &d->kobj, "bcache")) | |
899 | pr_debug("error creating sysfs link"); | |
900 | } | |
901 | ||
902 | static void cached_dev_detach_finish(struct work_struct *w) | |
903 | { | |
904 | struct cached_dev *dc = container_of(w, struct cached_dev, detach); | |
905 | char buf[BDEVNAME_SIZE]; | |
906 | struct closure cl; | |
907 | closure_init_stack(&cl); | |
908 | ||
c4d951dd | 909 | BUG_ON(!test_bit(BCACHE_DEV_DETACHING, &dc->disk.flags)); |
3b304d24 | 910 | BUG_ON(refcount_read(&dc->count)); |
cafe5635 | 911 | |
cafe5635 KO |
912 | mutex_lock(&bch_register_lock); |
913 | ||
8d29c442 TJ |
914 | cancel_delayed_work_sync(&dc->writeback_rate_update); |
915 | if (!IS_ERR_OR_NULL(dc->writeback_thread)) { | |
916 | kthread_stop(dc->writeback_thread); | |
917 | dc->writeback_thread = NULL; | |
918 | } | |
919 | ||
cafe5635 KO |
920 | memset(&dc->sb.set_uuid, 0, 16); |
921 | SET_BDEV_STATE(&dc->sb, BDEV_STATE_NONE); | |
922 | ||
923 | bch_write_bdev_super(dc, &cl); | |
924 | closure_sync(&cl); | |
925 | ||
926 | bcache_device_detach(&dc->disk); | |
927 | list_move(&dc->list, &uncached_devices); | |
928 | ||
c4d951dd | 929 | clear_bit(BCACHE_DEV_DETACHING, &dc->disk.flags); |
5b1016e6 | 930 | clear_bit(BCACHE_DEV_UNLINK_DONE, &dc->disk.flags); |
c4d951dd | 931 | |
cafe5635 KO |
932 | mutex_unlock(&bch_register_lock); |
933 | ||
934 | pr_info("Caching disabled for %s", bdevname(dc->bdev, buf)); | |
935 | ||
936 | /* Drop ref we took in cached_dev_detach() */ | |
937 | closure_put(&dc->disk.cl); | |
938 | } | |
939 | ||
940 | void bch_cached_dev_detach(struct cached_dev *dc) | |
941 | { | |
942 | lockdep_assert_held(&bch_register_lock); | |
943 | ||
c4d951dd | 944 | if (test_bit(BCACHE_DEV_CLOSING, &dc->disk.flags)) |
cafe5635 KO |
945 | return; |
946 | ||
c4d951dd | 947 | if (test_and_set_bit(BCACHE_DEV_DETACHING, &dc->disk.flags)) |
cafe5635 KO |
948 | return; |
949 | ||
950 | /* | |
951 | * Block the device from being closed and freed until we're finished | |
952 | * detaching | |
953 | */ | |
954 | closure_get(&dc->disk.cl); | |
955 | ||
956 | bch_writeback_queue(dc); | |
957 | cached_dev_put(dc); | |
958 | } | |
959 | ||
960 | int bch_cached_dev_attach(struct cached_dev *dc, struct cache_set *c) | |
961 | { | |
962 | uint32_t rtime = cpu_to_le32(get_seconds()); | |
963 | struct uuid_entry *u; | |
964 | char buf[BDEVNAME_SIZE]; | |
965 | ||
966 | bdevname(dc->bdev, buf); | |
967 | ||
968 | if (memcmp(dc->sb.set_uuid, c->sb.set_uuid, 16)) | |
969 | return -ENOENT; | |
970 | ||
971 | if (dc->disk.c) { | |
972 | pr_err("Can't attach %s: already attached", buf); | |
973 | return -EINVAL; | |
974 | } | |
975 | ||
976 | if (test_bit(CACHE_SET_STOPPING, &c->flags)) { | |
977 | pr_err("Can't attach %s: shutting down", buf); | |
978 | return -EINVAL; | |
979 | } | |
980 | ||
981 | if (dc->sb.block_size < c->sb.block_size) { | |
982 | /* Will die */ | |
b1a67b0f KO |
983 | pr_err("Couldn't attach %s: block size less than set's block size", |
984 | buf); | |
cafe5635 KO |
985 | return -EINVAL; |
986 | } | |
987 | ||
988 | u = uuid_find(c, dc->sb.uuid); | |
989 | ||
990 | if (u && | |
991 | (BDEV_STATE(&dc->sb) == BDEV_STATE_STALE || | |
992 | BDEV_STATE(&dc->sb) == BDEV_STATE_NONE)) { | |
993 | memcpy(u->uuid, invalid_uuid, 16); | |
994 | u->invalidated = cpu_to_le32(get_seconds()); | |
995 | u = NULL; | |
996 | } | |
997 | ||
998 | if (!u) { | |
999 | if (BDEV_STATE(&dc->sb) == BDEV_STATE_DIRTY) { | |
1000 | pr_err("Couldn't find uuid for %s in set", buf); | |
1001 | return -ENOENT; | |
1002 | } | |
1003 | ||
1004 | u = uuid_find_empty(c); | |
1005 | if (!u) { | |
1006 | pr_err("Not caching %s, no room for UUID", buf); | |
1007 | return -EINVAL; | |
1008 | } | |
1009 | } | |
1010 | ||
1011 | /* Deadlocks since we're called via sysfs... | |
1012 | sysfs_remove_file(&dc->kobj, &sysfs_attach); | |
1013 | */ | |
1014 | ||
169ef1cf | 1015 | if (bch_is_zero(u->uuid, 16)) { |
cafe5635 KO |
1016 | struct closure cl; |
1017 | closure_init_stack(&cl); | |
1018 | ||
1019 | memcpy(u->uuid, dc->sb.uuid, 16); | |
1020 | memcpy(u->label, dc->sb.label, SB_LABEL_SIZE); | |
1021 | u->first_reg = u->last_reg = rtime; | |
1022 | bch_uuid_write(c); | |
1023 | ||
1024 | memcpy(dc->sb.set_uuid, c->sb.set_uuid, 16); | |
1025 | SET_BDEV_STATE(&dc->sb, BDEV_STATE_CLEAN); | |
1026 | ||
1027 | bch_write_bdev_super(dc, &cl); | |
1028 | closure_sync(&cl); | |
1029 | } else { | |
1030 | u->last_reg = rtime; | |
1031 | bch_uuid_write(c); | |
1032 | } | |
1033 | ||
1034 | bcache_device_attach(&dc->disk, c, u - c->uuids); | |
cafe5635 KO |
1035 | list_move(&dc->list, &c->cached_devs); |
1036 | calc_cached_dev_sectors(c); | |
1037 | ||
1038 | smp_wmb(); | |
1039 | /* | |
1040 | * dc->c must be set before dc->count != 0 - paired with the mb in | |
1041 | * cached_dev_get() | |
1042 | */ | |
3b304d24 | 1043 | refcount_set(&dc->count, 1); |
cafe5635 | 1044 | |
07cc6ef8 EW |
1045 | /* Block writeback thread, but spawn it */ |
1046 | down_write(&dc->writeback_lock); | |
1047 | if (bch_cached_dev_writeback_start(dc)) { | |
1048 | up_write(&dc->writeback_lock); | |
9e5c3535 | 1049 | return -ENOMEM; |
07cc6ef8 | 1050 | } |
9e5c3535 | 1051 | |
cafe5635 | 1052 | if (BDEV_STATE(&dc->sb) == BDEV_STATE_DIRTY) { |
175206cf | 1053 | bch_sectors_dirty_init(&dc->disk); |
cafe5635 | 1054 | atomic_set(&dc->has_dirty, 1); |
3b304d24 | 1055 | refcount_inc(&dc->count); |
cafe5635 KO |
1056 | bch_writeback_queue(dc); |
1057 | } | |
1058 | ||
1059 | bch_cached_dev_run(dc); | |
ee668506 | 1060 | bcache_device_link(&dc->disk, c, "bdev"); |
cafe5635 | 1061 | |
07cc6ef8 EW |
1062 | /* Allow the writeback thread to proceed */ |
1063 | up_write(&dc->writeback_lock); | |
1064 | ||
cafe5635 KO |
1065 | pr_info("Caching %s as %s on set %pU", |
1066 | bdevname(dc->bdev, buf), dc->disk.disk->disk_name, | |
1067 | dc->disk.c->sb.set_uuid); | |
1068 | return 0; | |
1069 | } | |
1070 | ||
1071 | void bch_cached_dev_release(struct kobject *kobj) | |
1072 | { | |
1073 | struct cached_dev *dc = container_of(kobj, struct cached_dev, | |
1074 | disk.kobj); | |
1075 | kfree(dc); | |
1076 | module_put(THIS_MODULE); | |
1077 | } | |
1078 | ||
1079 | static void cached_dev_free(struct closure *cl) | |
1080 | { | |
1081 | struct cached_dev *dc = container_of(cl, struct cached_dev, disk.cl); | |
1082 | ||
1083 | cancel_delayed_work_sync(&dc->writeback_rate_update); | |
a664d0f0 SP |
1084 | if (!IS_ERR_OR_NULL(dc->writeback_thread)) |
1085 | kthread_stop(dc->writeback_thread); | |
9baf3097 TJ |
1086 | if (dc->writeback_write_wq) |
1087 | destroy_workqueue(dc->writeback_write_wq); | |
cafe5635 KO |
1088 | |
1089 | mutex_lock(&bch_register_lock); | |
1090 | ||
f59fce84 KO |
1091 | if (atomic_read(&dc->running)) |
1092 | bd_unlink_disk_holder(dc->bdev, dc->disk.disk); | |
cafe5635 KO |
1093 | bcache_device_free(&dc->disk); |
1094 | list_del(&dc->list); | |
1095 | ||
1096 | mutex_unlock(&bch_register_lock); | |
1097 | ||
0781c874 | 1098 | if (!IS_ERR_OR_NULL(dc->bdev)) |
cafe5635 | 1099 | blkdev_put(dc->bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL); |
cafe5635 KO |
1100 | |
1101 | wake_up(&unregister_wait); | |
1102 | ||
1103 | kobject_put(&dc->disk.kobj); | |
1104 | } | |
1105 | ||
1106 | static void cached_dev_flush(struct closure *cl) | |
1107 | { | |
1108 | struct cached_dev *dc = container_of(cl, struct cached_dev, disk.cl); | |
1109 | struct bcache_device *d = &dc->disk; | |
1110 | ||
c9502ea4 | 1111 | mutex_lock(&bch_register_lock); |
c4d951dd | 1112 | bcache_device_unlink(d); |
c9502ea4 KO |
1113 | mutex_unlock(&bch_register_lock); |
1114 | ||
cafe5635 KO |
1115 | bch_cache_accounting_destroy(&dc->accounting); |
1116 | kobject_del(&d->kobj); | |
1117 | ||
1118 | continue_at(cl, cached_dev_free, system_wq); | |
1119 | } | |
1120 | ||
1121 | static int cached_dev_init(struct cached_dev *dc, unsigned block_size) | |
1122 | { | |
f59fce84 | 1123 | int ret; |
cafe5635 | 1124 | struct io *io; |
f59fce84 | 1125 | struct request_queue *q = bdev_get_queue(dc->bdev); |
cafe5635 KO |
1126 | |
1127 | __module_get(THIS_MODULE); | |
1128 | INIT_LIST_HEAD(&dc->list); | |
f59fce84 KO |
1129 | closure_init(&dc->disk.cl, NULL); |
1130 | set_closure_fn(&dc->disk.cl, cached_dev_flush, system_wq); | |
cafe5635 | 1131 | kobject_init(&dc->disk.kobj, &bch_cached_dev_ktype); |
cafe5635 | 1132 | INIT_WORK(&dc->detach, cached_dev_detach_finish); |
cb7a583e | 1133 | sema_init(&dc->sb_write_mutex, 1); |
f59fce84 KO |
1134 | INIT_LIST_HEAD(&dc->io_lru); |
1135 | spin_lock_init(&dc->io_lock); | |
1136 | bch_cache_accounting_init(&dc->accounting, &dc->disk.cl); | |
cafe5635 | 1137 | |
cafe5635 KO |
1138 | dc->sequential_cutoff = 4 << 20; |
1139 | ||
cafe5635 KO |
1140 | for (io = dc->io; io < dc->io + RECENT_IO; io++) { |
1141 | list_add(&io->lru, &dc->io_lru); | |
1142 | hlist_add_head(&io->hash, dc->io_hash + RECENT_IO); | |
1143 | } | |
1144 | ||
c78afc62 KO |
1145 | dc->disk.stripe_size = q->limits.io_opt >> 9; |
1146 | ||
1147 | if (dc->disk.stripe_size) | |
1148 | dc->partial_stripes_expensive = | |
1149 | q->limits.raid_partial_stripes_expensive; | |
1150 | ||
279afbad KO |
1151 | ret = bcache_device_init(&dc->disk, block_size, |
1152 | dc->bdev->bd_part->nr_sects - dc->sb.data_offset); | |
f59fce84 KO |
1153 | if (ret) |
1154 | return ret; | |
1155 | ||
dc3b17cc JK |
1156 | dc->disk.disk->queue->backing_dev_info->ra_pages = |
1157 | max(dc->disk.disk->queue->backing_dev_info->ra_pages, | |
1158 | q->backing_dev_info->ra_pages); | |
f59fce84 KO |
1159 | |
1160 | bch_cached_dev_request_init(dc); | |
1161 | bch_cached_dev_writeback_init(dc); | |
cafe5635 | 1162 | return 0; |
cafe5635 KO |
1163 | } |
1164 | ||
1165 | /* Cached device - bcache superblock */ | |
1166 | ||
f59fce84 | 1167 | static void register_bdev(struct cache_sb *sb, struct page *sb_page, |
cafe5635 KO |
1168 | struct block_device *bdev, |
1169 | struct cached_dev *dc) | |
1170 | { | |
1171 | char name[BDEVNAME_SIZE]; | |
1172 | const char *err = "cannot allocate memory"; | |
cafe5635 KO |
1173 | struct cache_set *c; |
1174 | ||
cafe5635 | 1175 | memcpy(&dc->sb, sb, sizeof(struct cache_sb)); |
cafe5635 KO |
1176 | dc->bdev = bdev; |
1177 | dc->bdev->bd_holder = dc; | |
1178 | ||
3a83f467 | 1179 | bio_init(&dc->sb_bio, dc->sb_bio.bi_inline_vecs, 1); |
263663cd | 1180 | bio_first_bvec_all(&dc->sb_bio)->bv_page = sb_page; |
f59fce84 | 1181 | get_page(sb_page); |
4f0fd955 | 1182 | |
f59fce84 KO |
1183 | if (cached_dev_init(dc, sb->block_size << 9)) |
1184 | goto err; | |
cafe5635 KO |
1185 | |
1186 | err = "error creating kobject"; | |
1187 | if (kobject_add(&dc->disk.kobj, &part_to_dev(bdev->bd_part)->kobj, | |
1188 | "bcache")) | |
1189 | goto err; | |
1190 | if (bch_cache_accounting_add_kobjs(&dc->accounting, &dc->disk.kobj)) | |
1191 | goto err; | |
1192 | ||
f59fce84 KO |
1193 | pr_info("registered backing device %s", bdevname(bdev, name)); |
1194 | ||
cafe5635 KO |
1195 | list_add(&dc->list, &uncached_devices); |
1196 | list_for_each_entry(c, &bch_cache_sets, list) | |
1197 | bch_cached_dev_attach(dc, c); | |
1198 | ||
1199 | if (BDEV_STATE(&dc->sb) == BDEV_STATE_NONE || | |
1200 | BDEV_STATE(&dc->sb) == BDEV_STATE_STALE) | |
1201 | bch_cached_dev_run(dc); | |
1202 | ||
f59fce84 | 1203 | return; |
cafe5635 | 1204 | err: |
cafe5635 | 1205 | pr_notice("error opening %s: %s", bdevname(bdev, name), err); |
f59fce84 | 1206 | bcache_device_stop(&dc->disk); |
cafe5635 KO |
1207 | } |
1208 | ||
1209 | /* Flash only volumes */ | |
1210 | ||
1211 | void bch_flash_dev_release(struct kobject *kobj) | |
1212 | { | |
1213 | struct bcache_device *d = container_of(kobj, struct bcache_device, | |
1214 | kobj); | |
1215 | kfree(d); | |
1216 | } | |
1217 | ||
1218 | static void flash_dev_free(struct closure *cl) | |
1219 | { | |
1220 | struct bcache_device *d = container_of(cl, struct bcache_device, cl); | |
e5112201 | 1221 | mutex_lock(&bch_register_lock); |
cafe5635 | 1222 | bcache_device_free(d); |
e5112201 | 1223 | mutex_unlock(&bch_register_lock); |
cafe5635 KO |
1224 | kobject_put(&d->kobj); |
1225 | } | |
1226 | ||
1227 | static void flash_dev_flush(struct closure *cl) | |
1228 | { | |
1229 | struct bcache_device *d = container_of(cl, struct bcache_device, cl); | |
1230 | ||
e5112201 | 1231 | mutex_lock(&bch_register_lock); |
ee668506 | 1232 | bcache_device_unlink(d); |
e5112201 | 1233 | mutex_unlock(&bch_register_lock); |
cafe5635 KO |
1234 | kobject_del(&d->kobj); |
1235 | continue_at(cl, flash_dev_free, system_wq); | |
1236 | } | |
1237 | ||
1238 | static int flash_dev_run(struct cache_set *c, struct uuid_entry *u) | |
1239 | { | |
1240 | struct bcache_device *d = kzalloc(sizeof(struct bcache_device), | |
1241 | GFP_KERNEL); | |
1242 | if (!d) | |
1243 | return -ENOMEM; | |
1244 | ||
1245 | closure_init(&d->cl, NULL); | |
1246 | set_closure_fn(&d->cl, flash_dev_flush, system_wq); | |
1247 | ||
1248 | kobject_init(&d->kobj, &bch_flash_dev_ktype); | |
1249 | ||
279afbad | 1250 | if (bcache_device_init(d, block_bytes(c), u->sectors)) |
cafe5635 KO |
1251 | goto err; |
1252 | ||
1253 | bcache_device_attach(d, c, u - c->uuids); | |
175206cf | 1254 | bch_sectors_dirty_init(d); |
cafe5635 KO |
1255 | bch_flash_dev_request_init(d); |
1256 | add_disk(d->disk); | |
1257 | ||
1258 | if (kobject_add(&d->kobj, &disk_to_dev(d->disk)->kobj, "bcache")) | |
1259 | goto err; | |
1260 | ||
1261 | bcache_device_link(d, c, "volume"); | |
1262 | ||
1263 | return 0; | |
1264 | err: | |
1265 | kobject_put(&d->kobj); | |
1266 | return -ENOMEM; | |
1267 | } | |
1268 | ||
1269 | static int flash_devs_run(struct cache_set *c) | |
1270 | { | |
1271 | int ret = 0; | |
1272 | struct uuid_entry *u; | |
1273 | ||
1274 | for (u = c->uuids; | |
2831231d | 1275 | u < c->uuids + c->devices_max_used && !ret; |
cafe5635 KO |
1276 | u++) |
1277 | if (UUID_FLASH_ONLY(u)) | |
1278 | ret = flash_dev_run(c, u); | |
1279 | ||
1280 | return ret; | |
1281 | } | |
1282 | ||
1283 | int bch_flash_dev_create(struct cache_set *c, uint64_t size) | |
1284 | { | |
1285 | struct uuid_entry *u; | |
1286 | ||
1287 | if (test_bit(CACHE_SET_STOPPING, &c->flags)) | |
1288 | return -EINTR; | |
1289 | ||
bf0c55c9 SP |
1290 | if (!test_bit(CACHE_SET_RUNNING, &c->flags)) |
1291 | return -EPERM; | |
1292 | ||
cafe5635 KO |
1293 | u = uuid_find_empty(c); |
1294 | if (!u) { | |
1295 | pr_err("Can't create volume, no room for UUID"); | |
1296 | return -EINVAL; | |
1297 | } | |
1298 | ||
1299 | get_random_bytes(u->uuid, 16); | |
1300 | memset(u->label, 0, 32); | |
1301 | u->first_reg = u->last_reg = cpu_to_le32(get_seconds()); | |
1302 | ||
1303 | SET_UUID_FLASH_ONLY(u, 1); | |
1304 | u->sectors = size >> 9; | |
1305 | ||
1306 | bch_uuid_write(c); | |
1307 | ||
1308 | return flash_dev_run(c, u); | |
1309 | } | |
1310 | ||
1311 | /* Cache set */ | |
1312 | ||
1313 | __printf(2, 3) | |
1314 | bool bch_cache_set_error(struct cache_set *c, const char *fmt, ...) | |
1315 | { | |
1316 | va_list args; | |
1317 | ||
77c320eb KO |
1318 | if (c->on_error != ON_ERROR_PANIC && |
1319 | test_bit(CACHE_SET_STOPPING, &c->flags)) | |
cafe5635 KO |
1320 | return false; |
1321 | ||
1322 | /* XXX: we can be called from atomic context | |
1323 | acquire_console_sem(); | |
1324 | */ | |
1325 | ||
1326 | printk(KERN_ERR "bcache: error on %pU: ", c->sb.set_uuid); | |
1327 | ||
1328 | va_start(args, fmt); | |
1329 | vprintk(fmt, args); | |
1330 | va_end(args); | |
1331 | ||
1332 | printk(", disabling caching\n"); | |
1333 | ||
77c320eb KO |
1334 | if (c->on_error == ON_ERROR_PANIC) |
1335 | panic("panic forced after error\n"); | |
1336 | ||
cafe5635 KO |
1337 | bch_cache_set_unregister(c); |
1338 | return true; | |
1339 | } | |
1340 | ||
1341 | void bch_cache_set_release(struct kobject *kobj) | |
1342 | { | |
1343 | struct cache_set *c = container_of(kobj, struct cache_set, kobj); | |
1344 | kfree(c); | |
1345 | module_put(THIS_MODULE); | |
1346 | } | |
1347 | ||
1348 | static void cache_set_free(struct closure *cl) | |
1349 | { | |
1350 | struct cache_set *c = container_of(cl, struct cache_set, cl); | |
1351 | struct cache *ca; | |
1352 | unsigned i; | |
1353 | ||
1354 | if (!IS_ERR_OR_NULL(c->debug)) | |
1355 | debugfs_remove(c->debug); | |
1356 | ||
1357 | bch_open_buckets_free(c); | |
1358 | bch_btree_cache_free(c); | |
1359 | bch_journal_free(c); | |
1360 | ||
1361 | for_each_cache(ca, c, i) | |
c9a78332 SP |
1362 | if (ca) { |
1363 | ca->set = NULL; | |
1364 | c->cache[ca->sb.nr_this_dev] = NULL; | |
cafe5635 | 1365 | kobject_put(&ca->kobj); |
c9a78332 | 1366 | } |
cafe5635 | 1367 | |
67539e85 | 1368 | bch_bset_sort_state_free(&c->sort); |
cafe5635 | 1369 | free_pages((unsigned long) c->uuids, ilog2(bucket_pages(c))); |
cafe5635 | 1370 | |
da415a09 NS |
1371 | if (c->moving_gc_wq) |
1372 | destroy_workqueue(c->moving_gc_wq); | |
cafe5635 KO |
1373 | if (c->bio_split) |
1374 | bioset_free(c->bio_split); | |
57943511 KO |
1375 | if (c->fill_iter) |
1376 | mempool_destroy(c->fill_iter); | |
cafe5635 KO |
1377 | if (c->bio_meta) |
1378 | mempool_destroy(c->bio_meta); | |
1379 | if (c->search) | |
1380 | mempool_destroy(c->search); | |
1381 | kfree(c->devices); | |
1382 | ||
1383 | mutex_lock(&bch_register_lock); | |
1384 | list_del(&c->list); | |
1385 | mutex_unlock(&bch_register_lock); | |
1386 | ||
1387 | pr_info("Cache set %pU unregistered", c->sb.set_uuid); | |
1388 | wake_up(&unregister_wait); | |
1389 | ||
1390 | closure_debug_destroy(&c->cl); | |
1391 | kobject_put(&c->kobj); | |
1392 | } | |
1393 | ||
1394 | static void cache_set_flush(struct closure *cl) | |
1395 | { | |
1396 | struct cache_set *c = container_of(cl, struct cache_set, caching); | |
79826c35 | 1397 | struct cache *ca; |
cafe5635 | 1398 | struct btree *b; |
79826c35 | 1399 | unsigned i; |
cafe5635 KO |
1400 | |
1401 | bch_cache_accounting_destroy(&c->accounting); | |
1402 | ||
1403 | kobject_put(&c->internal); | |
1404 | kobject_del(&c->kobj); | |
1405 | ||
72a44517 KO |
1406 | if (c->gc_thread) |
1407 | kthread_stop(c->gc_thread); | |
1408 | ||
cafe5635 KO |
1409 | if (!IS_ERR_OR_NULL(c->root)) |
1410 | list_add(&c->root->list, &c->btree_cache); | |
1411 | ||
1412 | /* Should skip this if we're unregistering because of an error */ | |
2a285686 KO |
1413 | list_for_each_entry(b, &c->btree_cache, list) { |
1414 | mutex_lock(&b->write_lock); | |
cafe5635 | 1415 | if (btree_node_dirty(b)) |
2a285686 KO |
1416 | __bch_btree_node_write(b, NULL); |
1417 | mutex_unlock(&b->write_lock); | |
1418 | } | |
cafe5635 | 1419 | |
79826c35 KO |
1420 | for_each_cache(ca, c, i) |
1421 | if (ca->alloc_thread) | |
1422 | kthread_stop(ca->alloc_thread); | |
1423 | ||
5b1016e6 KO |
1424 | if (c->journal.cur) { |
1425 | cancel_delayed_work_sync(&c->journal.work); | |
1426 | /* flush last journal entry if needed */ | |
1427 | c->journal.work.work.func(&c->journal.work.work); | |
1428 | } | |
dabb4433 | 1429 | |
cafe5635 KO |
1430 | closure_return(cl); |
1431 | } | |
1432 | ||
1433 | static void __cache_set_unregister(struct closure *cl) | |
1434 | { | |
1435 | struct cache_set *c = container_of(cl, struct cache_set, caching); | |
5caa52af | 1436 | struct cached_dev *dc; |
cafe5635 KO |
1437 | size_t i; |
1438 | ||
1439 | mutex_lock(&bch_register_lock); | |
1440 | ||
2831231d | 1441 | for (i = 0; i < c->devices_max_used; i++) |
5caa52af KO |
1442 | if (c->devices[i]) { |
1443 | if (!UUID_FLASH_ONLY(&c->uuids[i]) && | |
1444 | test_bit(CACHE_SET_UNREGISTERING, &c->flags)) { | |
1445 | dc = container_of(c->devices[i], | |
1446 | struct cached_dev, disk); | |
1447 | bch_cached_dev_detach(dc); | |
1448 | } else { | |
1449 | bcache_device_stop(c->devices[i]); | |
1450 | } | |
1451 | } | |
cafe5635 KO |
1452 | |
1453 | mutex_unlock(&bch_register_lock); | |
1454 | ||
1455 | continue_at(cl, cache_set_flush, system_wq); | |
1456 | } | |
1457 | ||
1458 | void bch_cache_set_stop(struct cache_set *c) | |
1459 | { | |
1460 | if (!test_and_set_bit(CACHE_SET_STOPPING, &c->flags)) | |
1461 | closure_queue(&c->caching); | |
1462 | } | |
1463 | ||
1464 | void bch_cache_set_unregister(struct cache_set *c) | |
1465 | { | |
1466 | set_bit(CACHE_SET_UNREGISTERING, &c->flags); | |
1467 | bch_cache_set_stop(c); | |
1468 | } | |
1469 | ||
1470 | #define alloc_bucket_pages(gfp, c) \ | |
1471 | ((void *) __get_free_pages(__GFP_ZERO|gfp, ilog2(bucket_pages(c)))) | |
1472 | ||
1473 | struct cache_set *bch_cache_set_alloc(struct cache_sb *sb) | |
1474 | { | |
1475 | int iter_size; | |
1476 | struct cache_set *c = kzalloc(sizeof(struct cache_set), GFP_KERNEL); | |
1477 | if (!c) | |
1478 | return NULL; | |
1479 | ||
1480 | __module_get(THIS_MODULE); | |
1481 | closure_init(&c->cl, NULL); | |
1482 | set_closure_fn(&c->cl, cache_set_free, system_wq); | |
1483 | ||
1484 | closure_init(&c->caching, &c->cl); | |
1485 | set_closure_fn(&c->caching, __cache_set_unregister, system_wq); | |
1486 | ||
1487 | /* Maybe create continue_at_noreturn() and use it here? */ | |
1488 | closure_set_stopped(&c->cl); | |
1489 | closure_put(&c->cl); | |
1490 | ||
1491 | kobject_init(&c->kobj, &bch_cache_set_ktype); | |
1492 | kobject_init(&c->internal, &bch_cache_set_internal_ktype); | |
1493 | ||
1494 | bch_cache_accounting_init(&c->accounting, &c->cl); | |
1495 | ||
1496 | memcpy(c->sb.set_uuid, sb->set_uuid, 16); | |
1497 | c->sb.block_size = sb->block_size; | |
1498 | c->sb.bucket_size = sb->bucket_size; | |
1499 | c->sb.nr_in_set = sb->nr_in_set; | |
1500 | c->sb.last_mount = sb->last_mount; | |
1501 | c->bucket_bits = ilog2(sb->bucket_size); | |
1502 | c->block_bits = ilog2(sb->block_size); | |
1503 | c->nr_uuids = bucket_bytes(c) / sizeof(struct uuid_entry); | |
2831231d | 1504 | c->devices_max_used = 0; |
ee811287 | 1505 | c->btree_pages = bucket_pages(c); |
cafe5635 KO |
1506 | if (c->btree_pages > BTREE_MAX_PAGES) |
1507 | c->btree_pages = max_t(int, c->btree_pages / 4, | |
1508 | BTREE_MAX_PAGES); | |
1509 | ||
cb7a583e | 1510 | sema_init(&c->sb_write_mutex, 1); |
e8e1d468 | 1511 | mutex_init(&c->bucket_lock); |
0a63b66d | 1512 | init_waitqueue_head(&c->btree_cache_wait); |
35fcd848 | 1513 | init_waitqueue_head(&c->bucket_wait); |
be628be0 | 1514 | init_waitqueue_head(&c->gc_wait); |
cb7a583e | 1515 | sema_init(&c->uuid_write_mutex, 1); |
65d22e91 | 1516 | |
65d22e91 KO |
1517 | spin_lock_init(&c->btree_gc_time.lock); |
1518 | spin_lock_init(&c->btree_split_time.lock); | |
1519 | spin_lock_init(&c->btree_read_time.lock); | |
e8e1d468 | 1520 | |
cafe5635 KO |
1521 | bch_moving_init_cache_set(c); |
1522 | ||
1523 | INIT_LIST_HEAD(&c->list); | |
1524 | INIT_LIST_HEAD(&c->cached_devs); | |
1525 | INIT_LIST_HEAD(&c->btree_cache); | |
1526 | INIT_LIST_HEAD(&c->btree_cache_freeable); | |
1527 | INIT_LIST_HEAD(&c->btree_cache_freed); | |
1528 | INIT_LIST_HEAD(&c->data_buckets); | |
1529 | ||
1530 | c->search = mempool_create_slab_pool(32, bch_search_cache); | |
1531 | if (!c->search) | |
1532 | goto err; | |
1533 | ||
1534 | iter_size = (sb->bucket_size / sb->block_size + 1) * | |
1535 | sizeof(struct btree_iter_set); | |
1536 | ||
1537 | if (!(c->devices = kzalloc(c->nr_uuids * sizeof(void *), GFP_KERNEL)) || | |
1538 | !(c->bio_meta = mempool_create_kmalloc_pool(2, | |
1539 | sizeof(struct bbio) + sizeof(struct bio_vec) * | |
1540 | bucket_pages(c))) || | |
57943511 | 1541 | !(c->fill_iter = mempool_create_kmalloc_pool(1, iter_size)) || |
47e0fb46 N |
1542 | !(c->bio_split = bioset_create(4, offsetof(struct bbio, bio), |
1543 | BIOSET_NEED_BVECS | | |
1544 | BIOSET_NEED_RESCUER)) || | |
cafe5635 | 1545 | !(c->uuids = alloc_bucket_pages(GFP_KERNEL, c)) || |
81baf90a BS |
1546 | !(c->moving_gc_wq = alloc_workqueue("bcache_gc", |
1547 | WQ_MEM_RECLAIM, 0)) || | |
cafe5635 KO |
1548 | bch_journal_alloc(c) || |
1549 | bch_btree_cache_alloc(c) || | |
67539e85 KO |
1550 | bch_open_buckets_alloc(c) || |
1551 | bch_bset_sort_state_init(&c->sort, ilog2(c->btree_pages))) | |
cafe5635 KO |
1552 | goto err; |
1553 | ||
cafe5635 KO |
1554 | c->congested_read_threshold_us = 2000; |
1555 | c->congested_write_threshold_us = 20000; | |
1556 | c->error_limit = 8 << IO_ERROR_SHIFT; | |
1557 | ||
1558 | return c; | |
1559 | err: | |
1560 | bch_cache_set_unregister(c); | |
1561 | return NULL; | |
1562 | } | |
1563 | ||
1564 | static void run_cache_set(struct cache_set *c) | |
1565 | { | |
1566 | const char *err = "cannot allocate memory"; | |
1567 | struct cached_dev *dc, *t; | |
1568 | struct cache *ca; | |
c18536a7 | 1569 | struct closure cl; |
cafe5635 KO |
1570 | unsigned i; |
1571 | ||
c18536a7 | 1572 | closure_init_stack(&cl); |
cafe5635 KO |
1573 | |
1574 | for_each_cache(ca, c, i) | |
1575 | c->nbuckets += ca->sb.nbuckets; | |
be628be0 | 1576 | set_gc_sectors(c); |
cafe5635 KO |
1577 | |
1578 | if (CACHE_SYNC(&c->sb)) { | |
1579 | LIST_HEAD(journal); | |
1580 | struct bkey *k; | |
1581 | struct jset *j; | |
1582 | ||
1583 | err = "cannot allocate memory for journal"; | |
c18536a7 | 1584 | if (bch_journal_read(c, &journal)) |
cafe5635 KO |
1585 | goto err; |
1586 | ||
1587 | pr_debug("btree_journal_read() done"); | |
1588 | ||
1589 | err = "no journal entries found"; | |
1590 | if (list_empty(&journal)) | |
1591 | goto err; | |
1592 | ||
1593 | j = &list_entry(journal.prev, struct journal_replay, list)->j; | |
1594 | ||
1595 | err = "IO error reading priorities"; | |
1596 | for_each_cache(ca, c, i) | |
1597 | prio_read(ca, j->prio_bucket[ca->sb.nr_this_dev]); | |
1598 | ||
1599 | /* | |
1600 | * If prio_read() fails it'll call cache_set_error and we'll | |
1601 | * tear everything down right away, but if we perhaps checked | |
1602 | * sooner we could avoid journal replay. | |
1603 | */ | |
1604 | ||
1605 | k = &j->btree_root; | |
1606 | ||
1607 | err = "bad btree root"; | |
65d45231 | 1608 | if (__bch_btree_ptr_invalid(c, k)) |
cafe5635 KO |
1609 | goto err; |
1610 | ||
1611 | err = "error reading btree root"; | |
2452cc89 | 1612 | c->root = bch_btree_node_get(c, NULL, k, j->btree_level, true, NULL); |
cafe5635 KO |
1613 | if (IS_ERR_OR_NULL(c->root)) |
1614 | goto err; | |
1615 | ||
1616 | list_del_init(&c->root->list); | |
1617 | rw_unlock(true, c->root); | |
1618 | ||
c18536a7 | 1619 | err = uuid_read(c, j, &cl); |
cafe5635 KO |
1620 | if (err) |
1621 | goto err; | |
1622 | ||
1623 | err = "error in recovery"; | |
c18536a7 | 1624 | if (bch_btree_check(c)) |
cafe5635 KO |
1625 | goto err; |
1626 | ||
1627 | bch_journal_mark(c, &journal); | |
2531d9ee | 1628 | bch_initial_gc_finish(c); |
cafe5635 KO |
1629 | pr_debug("btree_check() done"); |
1630 | ||
1631 | /* | |
1632 | * bcache_journal_next() can't happen sooner, or | |
1633 | * btree_gc_finish() will give spurious errors about last_gc > | |
1634 | * gc_gen - this is a hack but oh well. | |
1635 | */ | |
1636 | bch_journal_next(&c->journal); | |
1637 | ||
119ba0f8 | 1638 | err = "error starting allocator thread"; |
cafe5635 | 1639 | for_each_cache(ca, c, i) |
119ba0f8 KO |
1640 | if (bch_cache_allocator_start(ca)) |
1641 | goto err; | |
cafe5635 KO |
1642 | |
1643 | /* | |
1644 | * First place it's safe to allocate: btree_check() and | |
1645 | * btree_gc_finish() have to run before we have buckets to | |
1646 | * allocate, and bch_bucket_alloc_set() might cause a journal | |
1647 | * entry to be written so bcache_journal_next() has to be called | |
1648 | * first. | |
1649 | * | |
1650 | * If the uuids were in the old format we have to rewrite them | |
1651 | * before the next journal entry is written: | |
1652 | */ | |
1653 | if (j->version < BCACHE_JSET_VERSION_UUID) | |
1654 | __uuid_write(c); | |
1655 | ||
c18536a7 | 1656 | bch_journal_replay(c, &journal); |
cafe5635 KO |
1657 | } else { |
1658 | pr_notice("invalidating existing data"); | |
cafe5635 KO |
1659 | |
1660 | for_each_cache(ca, c, i) { | |
1661 | unsigned j; | |
1662 | ||
1663 | ca->sb.keys = clamp_t(int, ca->sb.nbuckets >> 7, | |
1664 | 2, SB_JOURNAL_BUCKETS); | |
1665 | ||
1666 | for (j = 0; j < ca->sb.keys; j++) | |
1667 | ca->sb.d[j] = ca->sb.first_bucket + j; | |
1668 | } | |
1669 | ||
2531d9ee | 1670 | bch_initial_gc_finish(c); |
cafe5635 | 1671 | |
119ba0f8 | 1672 | err = "error starting allocator thread"; |
cafe5635 | 1673 | for_each_cache(ca, c, i) |
119ba0f8 KO |
1674 | if (bch_cache_allocator_start(ca)) |
1675 | goto err; | |
cafe5635 KO |
1676 | |
1677 | mutex_lock(&c->bucket_lock); | |
1678 | for_each_cache(ca, c, i) | |
1679 | bch_prio_write(ca); | |
1680 | mutex_unlock(&c->bucket_lock); | |
1681 | ||
cafe5635 KO |
1682 | err = "cannot allocate new UUID bucket"; |
1683 | if (__uuid_write(c)) | |
72a44517 | 1684 | goto err; |
cafe5635 KO |
1685 | |
1686 | err = "cannot allocate new btree root"; | |
2452cc89 | 1687 | c->root = __bch_btree_node_alloc(c, NULL, 0, true, NULL); |
cafe5635 | 1688 | if (IS_ERR_OR_NULL(c->root)) |
72a44517 | 1689 | goto err; |
cafe5635 | 1690 | |
2a285686 | 1691 | mutex_lock(&c->root->write_lock); |
cafe5635 | 1692 | bkey_copy_key(&c->root->key, &MAX_KEY); |
c18536a7 | 1693 | bch_btree_node_write(c->root, &cl); |
2a285686 | 1694 | mutex_unlock(&c->root->write_lock); |
cafe5635 KO |
1695 | |
1696 | bch_btree_set_root(c->root); | |
1697 | rw_unlock(true, c->root); | |
1698 | ||
1699 | /* | |
1700 | * We don't want to write the first journal entry until | |
1701 | * everything is set up - fortunately journal entries won't be | |
1702 | * written until the SET_CACHE_SYNC() here: | |
1703 | */ | |
1704 | SET_CACHE_SYNC(&c->sb, true); | |
1705 | ||
1706 | bch_journal_next(&c->journal); | |
c18536a7 | 1707 | bch_journal_meta(c, &cl); |
cafe5635 KO |
1708 | } |
1709 | ||
72a44517 KO |
1710 | err = "error starting gc thread"; |
1711 | if (bch_gc_thread_start(c)) | |
1712 | goto err; | |
1713 | ||
c18536a7 | 1714 | closure_sync(&cl); |
cafe5635 KO |
1715 | c->sb.last_mount = get_seconds(); |
1716 | bcache_write_super(c); | |
1717 | ||
1718 | list_for_each_entry_safe(dc, t, &uncached_devices, list) | |
1719 | bch_cached_dev_attach(dc, c); | |
1720 | ||
1721 | flash_devs_run(c); | |
1722 | ||
bf0c55c9 | 1723 | set_bit(CACHE_SET_RUNNING, &c->flags); |
cafe5635 | 1724 | return; |
cafe5635 | 1725 | err: |
c18536a7 | 1726 | closure_sync(&cl); |
cafe5635 | 1727 | /* XXX: test this, it's broken */ |
c8694948 | 1728 | bch_cache_set_error(c, "%s", err); |
cafe5635 KO |
1729 | } |
1730 | ||
1731 | static bool can_attach_cache(struct cache *ca, struct cache_set *c) | |
1732 | { | |
1733 | return ca->sb.block_size == c->sb.block_size && | |
9eb8ebeb | 1734 | ca->sb.bucket_size == c->sb.bucket_size && |
cafe5635 KO |
1735 | ca->sb.nr_in_set == c->sb.nr_in_set; |
1736 | } | |
1737 | ||
1738 | static const char *register_cache_set(struct cache *ca) | |
1739 | { | |
1740 | char buf[12]; | |
1741 | const char *err = "cannot allocate memory"; | |
1742 | struct cache_set *c; | |
1743 | ||
1744 | list_for_each_entry(c, &bch_cache_sets, list) | |
1745 | if (!memcmp(c->sb.set_uuid, ca->sb.set_uuid, 16)) { | |
1746 | if (c->cache[ca->sb.nr_this_dev]) | |
1747 | return "duplicate cache set member"; | |
1748 | ||
1749 | if (!can_attach_cache(ca, c)) | |
1750 | return "cache sb does not match set"; | |
1751 | ||
1752 | if (!CACHE_SYNC(&ca->sb)) | |
1753 | SET_CACHE_SYNC(&c->sb, false); | |
1754 | ||
1755 | goto found; | |
1756 | } | |
1757 | ||
1758 | c = bch_cache_set_alloc(&ca->sb); | |
1759 | if (!c) | |
1760 | return err; | |
1761 | ||
1762 | err = "error creating kobject"; | |
1763 | if (kobject_add(&c->kobj, bcache_kobj, "%pU", c->sb.set_uuid) || | |
1764 | kobject_add(&c->internal, &c->kobj, "internal")) | |
1765 | goto err; | |
1766 | ||
1767 | if (bch_cache_accounting_add_kobjs(&c->accounting, &c->kobj)) | |
1768 | goto err; | |
1769 | ||
1770 | bch_debug_init_cache_set(c); | |
1771 | ||
1772 | list_add(&c->list, &bch_cache_sets); | |
1773 | found: | |
1774 | sprintf(buf, "cache%i", ca->sb.nr_this_dev); | |
1775 | if (sysfs_create_link(&ca->kobj, &c->kobj, "set") || | |
1776 | sysfs_create_link(&c->kobj, &ca->kobj, buf)) | |
1777 | goto err; | |
1778 | ||
1779 | if (ca->sb.seq > c->sb.seq) { | |
1780 | c->sb.version = ca->sb.version; | |
1781 | memcpy(c->sb.set_uuid, ca->sb.set_uuid, 16); | |
1782 | c->sb.flags = ca->sb.flags; | |
1783 | c->sb.seq = ca->sb.seq; | |
1784 | pr_debug("set version = %llu", c->sb.version); | |
1785 | } | |
1786 | ||
d83353b3 | 1787 | kobject_get(&ca->kobj); |
cafe5635 KO |
1788 | ca->set = c; |
1789 | ca->set->cache[ca->sb.nr_this_dev] = ca; | |
1790 | c->cache_by_alloc[c->caches_loaded++] = ca; | |
1791 | ||
1792 | if (c->caches_loaded == c->sb.nr_in_set) | |
1793 | run_cache_set(c); | |
1794 | ||
1795 | return NULL; | |
1796 | err: | |
1797 | bch_cache_set_unregister(c); | |
1798 | return err; | |
1799 | } | |
1800 | ||
1801 | /* Cache device */ | |
1802 | ||
1803 | void bch_cache_release(struct kobject *kobj) | |
1804 | { | |
1805 | struct cache *ca = container_of(kobj, struct cache, kobj); | |
78365411 | 1806 | unsigned i; |
cafe5635 | 1807 | |
c9a78332 SP |
1808 | if (ca->set) { |
1809 | BUG_ON(ca->set->cache[ca->sb.nr_this_dev] != ca); | |
cafe5635 | 1810 | ca->set->cache[ca->sb.nr_this_dev] = NULL; |
c9a78332 | 1811 | } |
cafe5635 | 1812 | |
cafe5635 KO |
1813 | free_pages((unsigned long) ca->disk_buckets, ilog2(bucket_pages(ca))); |
1814 | kfree(ca->prio_buckets); | |
1815 | vfree(ca->buckets); | |
1816 | ||
1817 | free_heap(&ca->heap); | |
cafe5635 | 1818 | free_fifo(&ca->free_inc); |
78365411 KO |
1819 | |
1820 | for (i = 0; i < RESERVE_NR; i++) | |
1821 | free_fifo(&ca->free[i]); | |
cafe5635 KO |
1822 | |
1823 | if (ca->sb_bio.bi_inline_vecs[0].bv_page) | |
263663cd | 1824 | put_page(bio_first_page_all(&ca->sb_bio)); |
cafe5635 | 1825 | |
0781c874 | 1826 | if (!IS_ERR_OR_NULL(ca->bdev)) |
cafe5635 | 1827 | blkdev_put(ca->bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL); |
cafe5635 KO |
1828 | |
1829 | kfree(ca); | |
1830 | module_put(THIS_MODULE); | |
1831 | } | |
1832 | ||
c50d4d5d | 1833 | static int cache_alloc(struct cache *ca) |
cafe5635 KO |
1834 | { |
1835 | size_t free; | |
1836 | struct bucket *b; | |
1837 | ||
cafe5635 KO |
1838 | __module_get(THIS_MODULE); |
1839 | kobject_init(&ca->kobj, &bch_cache_ktype); | |
1840 | ||
3a83f467 | 1841 | bio_init(&ca->journal.bio, ca->journal.bio.bi_inline_vecs, 8); |
cafe5635 | 1842 | |
78365411 | 1843 | free = roundup_pow_of_two(ca->sb.nbuckets) >> 10; |
cafe5635 | 1844 | |
78365411 | 1845 | if (!init_fifo(&ca->free[RESERVE_BTREE], 8, GFP_KERNEL) || |
acc9cf8c | 1846 | !init_fifo_exact(&ca->free[RESERVE_PRIO], prio_buckets(ca), GFP_KERNEL) || |
78365411 KO |
1847 | !init_fifo(&ca->free[RESERVE_MOVINGGC], free, GFP_KERNEL) || |
1848 | !init_fifo(&ca->free[RESERVE_NONE], free, GFP_KERNEL) || | |
cafe5635 | 1849 | !init_fifo(&ca->free_inc, free << 2, GFP_KERNEL) || |
cafe5635 | 1850 | !init_heap(&ca->heap, free << 3, GFP_KERNEL) || |
f59fce84 | 1851 | !(ca->buckets = vzalloc(sizeof(struct bucket) * |
cafe5635 KO |
1852 | ca->sb.nbuckets)) || |
1853 | !(ca->prio_buckets = kzalloc(sizeof(uint64_t) * prio_buckets(ca) * | |
1854 | 2, GFP_KERNEL)) || | |
749b61da | 1855 | !(ca->disk_buckets = alloc_bucket_pages(GFP_KERNEL, ca))) |
f59fce84 | 1856 | return -ENOMEM; |
cafe5635 KO |
1857 | |
1858 | ca->prio_last_buckets = ca->prio_buckets + prio_buckets(ca); | |
1859 | ||
cafe5635 KO |
1860 | for_each_bucket(b, ca) |
1861 | atomic_set(&b->pin, 0); | |
1862 | ||
cafe5635 | 1863 | return 0; |
cafe5635 KO |
1864 | } |
1865 | ||
9b299728 | 1866 | static int register_cache(struct cache_sb *sb, struct page *sb_page, |
c9a78332 | 1867 | struct block_device *bdev, struct cache *ca) |
cafe5635 KO |
1868 | { |
1869 | char name[BDEVNAME_SIZE]; | |
d9dc1702 | 1870 | const char *err = NULL; /* must be set for any error case */ |
9b299728 | 1871 | int ret = 0; |
cafe5635 | 1872 | |
f59fce84 | 1873 | memcpy(&ca->sb, sb, sizeof(struct cache_sb)); |
cafe5635 KO |
1874 | ca->bdev = bdev; |
1875 | ca->bdev->bd_holder = ca; | |
1876 | ||
3a83f467 | 1877 | bio_init(&ca->sb_bio, ca->sb_bio.bi_inline_vecs, 1); |
263663cd | 1878 | bio_first_bvec_all(&ca->sb_bio)->bv_page = sb_page; |
f59fce84 KO |
1879 | get_page(sb_page); |
1880 | ||
cafe5635 KO |
1881 | if (blk_queue_discard(bdev_get_queue(ca->bdev))) |
1882 | ca->discard = CACHE_DISCARD(&ca->sb); | |
1883 | ||
c50d4d5d | 1884 | ret = cache_alloc(ca); |
d9dc1702 EW |
1885 | if (ret != 0) { |
1886 | if (ret == -ENOMEM) | |
1887 | err = "cache_alloc(): -ENOMEM"; | |
1888 | else | |
1889 | err = "cache_alloc(): unknown error"; | |
f59fce84 | 1890 | goto err; |
d9dc1702 | 1891 | } |
f59fce84 | 1892 | |
9b299728 EW |
1893 | if (kobject_add(&ca->kobj, &part_to_dev(bdev->bd_part)->kobj, "bcache")) { |
1894 | err = "error calling kobject_add"; | |
1895 | ret = -ENOMEM; | |
1896 | goto out; | |
1897 | } | |
cafe5635 | 1898 | |
4fa03402 | 1899 | mutex_lock(&bch_register_lock); |
cafe5635 | 1900 | err = register_cache_set(ca); |
4fa03402 KO |
1901 | mutex_unlock(&bch_register_lock); |
1902 | ||
9b299728 EW |
1903 | if (err) { |
1904 | ret = -ENODEV; | |
1905 | goto out; | |
1906 | } | |
cafe5635 KO |
1907 | |
1908 | pr_info("registered cache device %s", bdevname(bdev, name)); | |
9b299728 | 1909 | |
d83353b3 KO |
1910 | out: |
1911 | kobject_put(&ca->kobj); | |
9b299728 | 1912 | |
cafe5635 | 1913 | err: |
9b299728 EW |
1914 | if (err) |
1915 | pr_notice("error opening %s: %s", bdevname(bdev, name), err); | |
1916 | ||
1917 | return ret; | |
cafe5635 KO |
1918 | } |
1919 | ||
1920 | /* Global interfaces/init */ | |
1921 | ||
1922 | static ssize_t register_bcache(struct kobject *, struct kobj_attribute *, | |
1923 | const char *, size_t); | |
1924 | ||
1925 | kobj_attribute_write(register, register_bcache); | |
1926 | kobj_attribute_write(register_quiet, register_bcache); | |
1927 | ||
a9dd53ad GP |
1928 | static bool bch_is_open_backing(struct block_device *bdev) { |
1929 | struct cache_set *c, *tc; | |
1930 | struct cached_dev *dc, *t; | |
1931 | ||
1932 | list_for_each_entry_safe(c, tc, &bch_cache_sets, list) | |
1933 | list_for_each_entry_safe(dc, t, &c->cached_devs, list) | |
1934 | if (dc->bdev == bdev) | |
1935 | return true; | |
1936 | list_for_each_entry_safe(dc, t, &uncached_devices, list) | |
1937 | if (dc->bdev == bdev) | |
1938 | return true; | |
1939 | return false; | |
1940 | } | |
1941 | ||
1942 | static bool bch_is_open_cache(struct block_device *bdev) { | |
1943 | struct cache_set *c, *tc; | |
1944 | struct cache *ca; | |
1945 | unsigned i; | |
1946 | ||
1947 | list_for_each_entry_safe(c, tc, &bch_cache_sets, list) | |
1948 | for_each_cache(ca, c, i) | |
1949 | if (ca->bdev == bdev) | |
1950 | return true; | |
1951 | return false; | |
1952 | } | |
1953 | ||
1954 | static bool bch_is_open(struct block_device *bdev) { | |
1955 | return bch_is_open_cache(bdev) || bch_is_open_backing(bdev); | |
1956 | } | |
1957 | ||
cafe5635 KO |
1958 | static ssize_t register_bcache(struct kobject *k, struct kobj_attribute *attr, |
1959 | const char *buffer, size_t size) | |
1960 | { | |
1961 | ssize_t ret = size; | |
1962 | const char *err = "cannot allocate memory"; | |
1963 | char *path = NULL; | |
1964 | struct cache_sb *sb = NULL; | |
1965 | struct block_device *bdev = NULL; | |
1966 | struct page *sb_page = NULL; | |
1967 | ||
1968 | if (!try_module_get(THIS_MODULE)) | |
1969 | return -EBUSY; | |
1970 | ||
cafe5635 KO |
1971 | if (!(path = kstrndup(buffer, size, GFP_KERNEL)) || |
1972 | !(sb = kmalloc(sizeof(struct cache_sb), GFP_KERNEL))) | |
1973 | goto err; | |
1974 | ||
1975 | err = "failed to open device"; | |
1976 | bdev = blkdev_get_by_path(strim(path), | |
1977 | FMODE_READ|FMODE_WRITE|FMODE_EXCL, | |
1978 | sb); | |
f59fce84 | 1979 | if (IS_ERR(bdev)) { |
a9dd53ad GP |
1980 | if (bdev == ERR_PTR(-EBUSY)) { |
1981 | bdev = lookup_bdev(strim(path)); | |
789d21db | 1982 | mutex_lock(&bch_register_lock); |
a9dd53ad GP |
1983 | if (!IS_ERR(bdev) && bch_is_open(bdev)) |
1984 | err = "device already registered"; | |
1985 | else | |
1986 | err = "device busy"; | |
789d21db | 1987 | mutex_unlock(&bch_register_lock); |
4b758df2 JK |
1988 | if (!IS_ERR(bdev)) |
1989 | bdput(bdev); | |
d7076f21 GP |
1990 | if (attr == &ksysfs_register_quiet) |
1991 | goto out; | |
a9dd53ad | 1992 | } |
cafe5635 | 1993 | goto err; |
f59fce84 KO |
1994 | } |
1995 | ||
1996 | err = "failed to set blocksize"; | |
1997 | if (set_blocksize(bdev, 4096)) | |
1998 | goto err_close; | |
cafe5635 KO |
1999 | |
2000 | err = read_super(sb, bdev, &sb_page); | |
2001 | if (err) | |
2002 | goto err_close; | |
2003 | ||
2903381f | 2004 | if (SB_IS_BDEV(sb)) { |
cafe5635 | 2005 | struct cached_dev *dc = kzalloc(sizeof(*dc), GFP_KERNEL); |
f59fce84 KO |
2006 | if (!dc) |
2007 | goto err_close; | |
cafe5635 | 2008 | |
4fa03402 | 2009 | mutex_lock(&bch_register_lock); |
f59fce84 | 2010 | register_bdev(sb, sb_page, bdev, dc); |
4fa03402 | 2011 | mutex_unlock(&bch_register_lock); |
cafe5635 KO |
2012 | } else { |
2013 | struct cache *ca = kzalloc(sizeof(*ca), GFP_KERNEL); | |
f59fce84 KO |
2014 | if (!ca) |
2015 | goto err_close; | |
cafe5635 | 2016 | |
9b299728 EW |
2017 | if (register_cache(sb, sb_page, bdev, ca) != 0) |
2018 | goto err_close; | |
cafe5635 | 2019 | } |
f59fce84 KO |
2020 | out: |
2021 | if (sb_page) | |
cafe5635 | 2022 | put_page(sb_page); |
cafe5635 KO |
2023 | kfree(sb); |
2024 | kfree(path); | |
cafe5635 KO |
2025 | module_put(THIS_MODULE); |
2026 | return ret; | |
f59fce84 KO |
2027 | |
2028 | err_close: | |
2029 | blkdev_put(bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL); | |
2030 | err: | |
d7076f21 | 2031 | pr_info("error opening %s: %s", path, err); |
f59fce84 KO |
2032 | ret = -EINVAL; |
2033 | goto out; | |
cafe5635 KO |
2034 | } |
2035 | ||
2036 | static int bcache_reboot(struct notifier_block *n, unsigned long code, void *x) | |
2037 | { | |
2038 | if (code == SYS_DOWN || | |
2039 | code == SYS_HALT || | |
2040 | code == SYS_POWER_OFF) { | |
2041 | DEFINE_WAIT(wait); | |
2042 | unsigned long start = jiffies; | |
2043 | bool stopped = false; | |
2044 | ||
2045 | struct cache_set *c, *tc; | |
2046 | struct cached_dev *dc, *tdc; | |
2047 | ||
2048 | mutex_lock(&bch_register_lock); | |
2049 | ||
2050 | if (list_empty(&bch_cache_sets) && | |
2051 | list_empty(&uncached_devices)) | |
2052 | goto out; | |
2053 | ||
2054 | pr_info("Stopping all devices:"); | |
2055 | ||
2056 | list_for_each_entry_safe(c, tc, &bch_cache_sets, list) | |
2057 | bch_cache_set_stop(c); | |
2058 | ||
2059 | list_for_each_entry_safe(dc, tdc, &uncached_devices, list) | |
2060 | bcache_device_stop(&dc->disk); | |
2061 | ||
2062 | /* What's a condition variable? */ | |
2063 | while (1) { | |
2064 | long timeout = start + 2 * HZ - jiffies; | |
2065 | ||
2066 | stopped = list_empty(&bch_cache_sets) && | |
2067 | list_empty(&uncached_devices); | |
2068 | ||
2069 | if (timeout < 0 || stopped) | |
2070 | break; | |
2071 | ||
2072 | prepare_to_wait(&unregister_wait, &wait, | |
2073 | TASK_UNINTERRUPTIBLE); | |
2074 | ||
2075 | mutex_unlock(&bch_register_lock); | |
2076 | schedule_timeout(timeout); | |
2077 | mutex_lock(&bch_register_lock); | |
2078 | } | |
2079 | ||
2080 | finish_wait(&unregister_wait, &wait); | |
2081 | ||
2082 | if (stopped) | |
2083 | pr_info("All devices stopped"); | |
2084 | else | |
2085 | pr_notice("Timeout waiting for devices to be closed"); | |
2086 | out: | |
2087 | mutex_unlock(&bch_register_lock); | |
2088 | } | |
2089 | ||
2090 | return NOTIFY_DONE; | |
2091 | } | |
2092 | ||
2093 | static struct notifier_block reboot = { | |
2094 | .notifier_call = bcache_reboot, | |
2095 | .priority = INT_MAX, /* before any real devices */ | |
2096 | }; | |
2097 | ||
2098 | static void bcache_exit(void) | |
2099 | { | |
2100 | bch_debug_exit(); | |
cafe5635 | 2101 | bch_request_exit(); |
cafe5635 KO |
2102 | if (bcache_kobj) |
2103 | kobject_put(bcache_kobj); | |
2104 | if (bcache_wq) | |
2105 | destroy_workqueue(bcache_wq); | |
5c41c8a7 KO |
2106 | if (bcache_major) |
2107 | unregister_blkdev(bcache_major, "bcache"); | |
cafe5635 | 2108 | unregister_reboot_notifier(&reboot); |
330a4db8 | 2109 | mutex_destroy(&bch_register_lock); |
cafe5635 KO |
2110 | } |
2111 | ||
2112 | static int __init bcache_init(void) | |
2113 | { | |
2114 | static const struct attribute *files[] = { | |
2115 | &ksysfs_register.attr, | |
2116 | &ksysfs_register_quiet.attr, | |
2117 | NULL | |
2118 | }; | |
2119 | ||
2120 | mutex_init(&bch_register_lock); | |
2121 | init_waitqueue_head(&unregister_wait); | |
2122 | register_reboot_notifier(&reboot); | |
07e86ccb | 2123 | closure_debug_init(); |
cafe5635 KO |
2124 | |
2125 | bcache_major = register_blkdev(0, "bcache"); | |
2ecf0cdb ZL |
2126 | if (bcache_major < 0) { |
2127 | unregister_reboot_notifier(&reboot); | |
330a4db8 | 2128 | mutex_destroy(&bch_register_lock); |
cafe5635 | 2129 | return bcache_major; |
2ecf0cdb | 2130 | } |
cafe5635 | 2131 | |
81baf90a | 2132 | if (!(bcache_wq = alloc_workqueue("bcache", WQ_MEM_RECLAIM, 0)) || |
cafe5635 | 2133 | !(bcache_kobj = kobject_create_and_add("bcache", fs_kobj)) || |
cafe5635 | 2134 | bch_request_init() || |
330a4db8 LC |
2135 | bch_debug_init(bcache_kobj) || |
2136 | sysfs_create_files(bcache_kobj, files)) | |
cafe5635 KO |
2137 | goto err; |
2138 | ||
2139 | return 0; | |
2140 | err: | |
2141 | bcache_exit(); | |
2142 | return -ENOMEM; | |
2143 | } | |
2144 | ||
2145 | module_exit(bcache_exit); | |
2146 | module_init(bcache_init); |