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 KO |
55 | static int bcache_major; |
56 | static DEFINE_IDA(bcache_minor); | |
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) | |
61 | ||
cafe5635 KO |
62 | /* Superblock */ |
63 | ||
64 | static const char *read_super(struct cache_sb *sb, struct block_device *bdev, | |
65 | struct page **res) | |
66 | { | |
67 | const char *err; | |
68 | struct cache_sb *s; | |
69 | struct buffer_head *bh = __bread(bdev, 1, SB_SIZE); | |
70 | unsigned i; | |
71 | ||
72 | if (!bh) | |
73 | return "IO error"; | |
74 | ||
75 | s = (struct cache_sb *) bh->b_data; | |
76 | ||
77 | sb->offset = le64_to_cpu(s->offset); | |
78 | sb->version = le64_to_cpu(s->version); | |
79 | ||
80 | memcpy(sb->magic, s->magic, 16); | |
81 | memcpy(sb->uuid, s->uuid, 16); | |
82 | memcpy(sb->set_uuid, s->set_uuid, 16); | |
83 | memcpy(sb->label, s->label, SB_LABEL_SIZE); | |
84 | ||
85 | sb->flags = le64_to_cpu(s->flags); | |
86 | sb->seq = le64_to_cpu(s->seq); | |
cafe5635 | 87 | sb->last_mount = le32_to_cpu(s->last_mount); |
cafe5635 KO |
88 | sb->first_bucket = le16_to_cpu(s->first_bucket); |
89 | sb->keys = le16_to_cpu(s->keys); | |
90 | ||
91 | for (i = 0; i < SB_JOURNAL_BUCKETS; i++) | |
92 | sb->d[i] = le64_to_cpu(s->d[i]); | |
93 | ||
94 | pr_debug("read sb version %llu, flags %llu, seq %llu, journal size %u", | |
95 | sb->version, sb->flags, sb->seq, sb->keys); | |
96 | ||
97 | err = "Not a bcache superblock"; | |
98 | if (sb->offset != SB_SECTOR) | |
99 | goto err; | |
100 | ||
101 | if (memcmp(sb->magic, bcache_magic, 16)) | |
102 | goto err; | |
103 | ||
104 | err = "Too many journal buckets"; | |
105 | if (sb->keys > SB_JOURNAL_BUCKETS) | |
106 | goto err; | |
107 | ||
108 | err = "Bad checksum"; | |
109 | if (s->csum != csum_set(s)) | |
110 | goto err; | |
111 | ||
112 | err = "Bad UUID"; | |
169ef1cf | 113 | if (bch_is_zero(sb->uuid, 16)) |
cafe5635 KO |
114 | goto err; |
115 | ||
8abb2a5d KO |
116 | sb->block_size = le16_to_cpu(s->block_size); |
117 | ||
118 | err = "Superblock block size smaller than device block size"; | |
119 | if (sb->block_size << 9 < bdev_logical_block_size(bdev)) | |
120 | goto err; | |
121 | ||
2903381f KO |
122 | switch (sb->version) { |
123 | case BCACHE_SB_VERSION_BDEV: | |
2903381f KO |
124 | sb->data_offset = BDEV_DATA_START_DEFAULT; |
125 | break; | |
126 | case BCACHE_SB_VERSION_BDEV_WITH_OFFSET: | |
2903381f KO |
127 | sb->data_offset = le64_to_cpu(s->data_offset); |
128 | ||
129 | err = "Bad data offset"; | |
130 | if (sb->data_offset < BDEV_DATA_START_DEFAULT) | |
131 | goto err; | |
cafe5635 | 132 | |
2903381f KO |
133 | break; |
134 | case BCACHE_SB_VERSION_CDEV: | |
135 | case BCACHE_SB_VERSION_CDEV_WITH_UUID: | |
136 | sb->nbuckets = le64_to_cpu(s->nbuckets); | |
2903381f | 137 | sb->bucket_size = le16_to_cpu(s->bucket_size); |
cafe5635 | 138 | |
2903381f KO |
139 | sb->nr_in_set = le16_to_cpu(s->nr_in_set); |
140 | sb->nr_this_dev = le16_to_cpu(s->nr_this_dev); | |
cafe5635 | 141 | |
2903381f KO |
142 | err = "Too many buckets"; |
143 | if (sb->nbuckets > LONG_MAX) | |
144 | goto err; | |
cafe5635 | 145 | |
2903381f KO |
146 | err = "Not enough buckets"; |
147 | if (sb->nbuckets < 1 << 7) | |
148 | goto err; | |
cafe5635 | 149 | |
2903381f KO |
150 | err = "Bad block/bucket size"; |
151 | if (!is_power_of_2(sb->block_size) || | |
152 | sb->block_size > PAGE_SECTORS || | |
153 | !is_power_of_2(sb->bucket_size) || | |
154 | sb->bucket_size < PAGE_SECTORS) | |
155 | goto err; | |
cafe5635 | 156 | |
2903381f KO |
157 | err = "Invalid superblock: device too small"; |
158 | if (get_capacity(bdev->bd_disk) < sb->bucket_size * sb->nbuckets) | |
159 | goto err; | |
cafe5635 | 160 | |
2903381f KO |
161 | err = "Bad UUID"; |
162 | if (bch_is_zero(sb->set_uuid, 16)) | |
163 | goto err; | |
cafe5635 | 164 | |
2903381f KO |
165 | err = "Bad cache device number in set"; |
166 | if (!sb->nr_in_set || | |
167 | sb->nr_in_set <= sb->nr_this_dev || | |
168 | sb->nr_in_set > MAX_CACHES_PER_SET) | |
cafe5635 KO |
169 | goto err; |
170 | ||
2903381f KO |
171 | err = "Journal buckets not sequential"; |
172 | for (i = 0; i < sb->keys; i++) | |
173 | if (sb->d[i] != sb->first_bucket + i) | |
174 | goto err; | |
cafe5635 | 175 | |
2903381f KO |
176 | err = "Too many journal buckets"; |
177 | if (sb->first_bucket + sb->keys > sb->nbuckets) | |
178 | goto err; | |
179 | ||
180 | err = "Invalid superblock: first bucket comes before end of super"; | |
181 | if (sb->first_bucket * sb->bucket_size < 16) | |
182 | goto err; | |
183 | ||
184 | break; | |
185 | default: | |
186 | err = "Unsupported superblock version"; | |
cafe5635 | 187 | goto err; |
2903381f KO |
188 | } |
189 | ||
cafe5635 KO |
190 | sb->last_mount = get_seconds(); |
191 | err = NULL; | |
192 | ||
193 | get_page(bh->b_page); | |
194 | *res = bh->b_page; | |
195 | err: | |
196 | put_bh(bh); | |
197 | return err; | |
198 | } | |
199 | ||
4246a0b6 | 200 | static void write_bdev_super_endio(struct bio *bio) |
cafe5635 KO |
201 | { |
202 | struct cached_dev *dc = bio->bi_private; | |
203 | /* XXX: error checking */ | |
204 | ||
cb7a583e | 205 | closure_put(&dc->sb_write); |
cafe5635 KO |
206 | } |
207 | ||
208 | static void __write_super(struct cache_sb *sb, struct bio *bio) | |
209 | { | |
210 | struct cache_sb *out = page_address(bio->bi_io_vec[0].bv_page); | |
211 | unsigned i; | |
212 | ||
4f024f37 | 213 | bio->bi_iter.bi_sector = SB_SECTOR; |
4f024f37 | 214 | bio->bi_iter.bi_size = SB_SIZE; |
ad0d9e76 | 215 | bio_set_op_attrs(bio, REQ_OP_WRITE, REQ_SYNC|REQ_META); |
169ef1cf | 216 | bch_bio_map(bio, NULL); |
cafe5635 KO |
217 | |
218 | out->offset = cpu_to_le64(sb->offset); | |
219 | out->version = cpu_to_le64(sb->version); | |
220 | ||
221 | memcpy(out->uuid, sb->uuid, 16); | |
222 | memcpy(out->set_uuid, sb->set_uuid, 16); | |
223 | memcpy(out->label, sb->label, SB_LABEL_SIZE); | |
224 | ||
225 | out->flags = cpu_to_le64(sb->flags); | |
226 | out->seq = cpu_to_le64(sb->seq); | |
227 | ||
228 | out->last_mount = cpu_to_le32(sb->last_mount); | |
229 | out->first_bucket = cpu_to_le16(sb->first_bucket); | |
230 | out->keys = cpu_to_le16(sb->keys); | |
231 | ||
232 | for (i = 0; i < sb->keys; i++) | |
233 | out->d[i] = cpu_to_le64(sb->d[i]); | |
234 | ||
235 | out->csum = csum_set(out); | |
236 | ||
237 | pr_debug("ver %llu, flags %llu, seq %llu", | |
238 | sb->version, sb->flags, sb->seq); | |
239 | ||
4e49ea4a | 240 | submit_bio(bio); |
cafe5635 KO |
241 | } |
242 | ||
cb7a583e KO |
243 | static void bch_write_bdev_super_unlock(struct closure *cl) |
244 | { | |
245 | struct cached_dev *dc = container_of(cl, struct cached_dev, sb_write); | |
246 | ||
247 | up(&dc->sb_write_mutex); | |
248 | } | |
249 | ||
cafe5635 KO |
250 | void bch_write_bdev_super(struct cached_dev *dc, struct closure *parent) |
251 | { | |
cb7a583e | 252 | struct closure *cl = &dc->sb_write; |
cafe5635 KO |
253 | struct bio *bio = &dc->sb_bio; |
254 | ||
cb7a583e KO |
255 | down(&dc->sb_write_mutex); |
256 | closure_init(cl, parent); | |
cafe5635 KO |
257 | |
258 | bio_reset(bio); | |
259 | bio->bi_bdev = dc->bdev; | |
260 | bio->bi_end_io = write_bdev_super_endio; | |
261 | bio->bi_private = dc; | |
262 | ||
263 | closure_get(cl); | |
264 | __write_super(&dc->sb, bio); | |
265 | ||
cb7a583e | 266 | closure_return_with_destructor(cl, bch_write_bdev_super_unlock); |
cafe5635 KO |
267 | } |
268 | ||
4246a0b6 | 269 | static void write_super_endio(struct bio *bio) |
cafe5635 KO |
270 | { |
271 | struct cache *ca = bio->bi_private; | |
272 | ||
4246a0b6 | 273 | bch_count_io_errors(ca, bio->bi_error, "writing superblock"); |
cb7a583e KO |
274 | closure_put(&ca->set->sb_write); |
275 | } | |
276 | ||
277 | static void bcache_write_super_unlock(struct closure *cl) | |
278 | { | |
279 | struct cache_set *c = container_of(cl, struct cache_set, sb_write); | |
280 | ||
281 | up(&c->sb_write_mutex); | |
cafe5635 KO |
282 | } |
283 | ||
284 | void bcache_write_super(struct cache_set *c) | |
285 | { | |
cb7a583e | 286 | struct closure *cl = &c->sb_write; |
cafe5635 KO |
287 | struct cache *ca; |
288 | unsigned i; | |
289 | ||
cb7a583e KO |
290 | down(&c->sb_write_mutex); |
291 | closure_init(cl, &c->cl); | |
cafe5635 KO |
292 | |
293 | c->sb.seq++; | |
294 | ||
295 | for_each_cache(ca, c, i) { | |
296 | struct bio *bio = &ca->sb_bio; | |
297 | ||
2903381f | 298 | ca->sb.version = BCACHE_SB_VERSION_CDEV_WITH_UUID; |
cafe5635 KO |
299 | ca->sb.seq = c->sb.seq; |
300 | ca->sb.last_mount = c->sb.last_mount; | |
301 | ||
302 | SET_CACHE_SYNC(&ca->sb, CACHE_SYNC(&c->sb)); | |
303 | ||
304 | bio_reset(bio); | |
305 | bio->bi_bdev = ca->bdev; | |
306 | bio->bi_end_io = write_super_endio; | |
307 | bio->bi_private = ca; | |
308 | ||
309 | closure_get(cl); | |
310 | __write_super(&ca->sb, bio); | |
311 | } | |
312 | ||
cb7a583e | 313 | closure_return_with_destructor(cl, bcache_write_super_unlock); |
cafe5635 KO |
314 | } |
315 | ||
316 | /* UUID io */ | |
317 | ||
4246a0b6 | 318 | static void uuid_endio(struct bio *bio) |
cafe5635 KO |
319 | { |
320 | struct closure *cl = bio->bi_private; | |
cb7a583e | 321 | struct cache_set *c = container_of(cl, struct cache_set, uuid_write); |
cafe5635 | 322 | |
4246a0b6 | 323 | cache_set_err_on(bio->bi_error, c, "accessing uuids"); |
cafe5635 KO |
324 | bch_bbio_free(bio, c); |
325 | closure_put(cl); | |
326 | } | |
327 | ||
cb7a583e KO |
328 | static void uuid_io_unlock(struct closure *cl) |
329 | { | |
330 | struct cache_set *c = container_of(cl, struct cache_set, uuid_write); | |
331 | ||
332 | up(&c->uuid_write_mutex); | |
333 | } | |
334 | ||
ad0d9e76 | 335 | static void uuid_io(struct cache_set *c, int op, unsigned long op_flags, |
cafe5635 KO |
336 | struct bkey *k, struct closure *parent) |
337 | { | |
cb7a583e | 338 | struct closure *cl = &c->uuid_write; |
cafe5635 KO |
339 | struct uuid_entry *u; |
340 | unsigned i; | |
85b1492e | 341 | char buf[80]; |
cafe5635 KO |
342 | |
343 | BUG_ON(!parent); | |
cb7a583e KO |
344 | down(&c->uuid_write_mutex); |
345 | closure_init(cl, parent); | |
cafe5635 KO |
346 | |
347 | for (i = 0; i < KEY_PTRS(k); i++) { | |
348 | struct bio *bio = bch_bbio_alloc(c); | |
349 | ||
1eff9d32 | 350 | bio->bi_opf = REQ_SYNC | REQ_META | op_flags; |
4f024f37 | 351 | bio->bi_iter.bi_size = KEY_SIZE(k) << 9; |
cafe5635 KO |
352 | |
353 | bio->bi_end_io = uuid_endio; | |
354 | bio->bi_private = cl; | |
ad0d9e76 | 355 | bio_set_op_attrs(bio, op, REQ_SYNC|REQ_META|op_flags); |
169ef1cf | 356 | bch_bio_map(bio, c->uuids); |
cafe5635 KO |
357 | |
358 | bch_submit_bbio(bio, c, k, i); | |
359 | ||
ad0d9e76 | 360 | if (op != REQ_OP_WRITE) |
cafe5635 KO |
361 | break; |
362 | } | |
363 | ||
dc9d98d6 | 364 | bch_extent_to_text(buf, sizeof(buf), k); |
ad0d9e76 | 365 | pr_debug("%s UUIDs at %s", op == REQ_OP_WRITE ? "wrote" : "read", buf); |
cafe5635 KO |
366 | |
367 | for (u = c->uuids; u < c->uuids + c->nr_uuids; u++) | |
169ef1cf | 368 | if (!bch_is_zero(u->uuid, 16)) |
cafe5635 KO |
369 | pr_debug("Slot %zi: %pU: %s: 1st: %u last: %u inv: %u", |
370 | u - c->uuids, u->uuid, u->label, | |
371 | u->first_reg, u->last_reg, u->invalidated); | |
372 | ||
cb7a583e | 373 | closure_return_with_destructor(cl, uuid_io_unlock); |
cafe5635 KO |
374 | } |
375 | ||
376 | static char *uuid_read(struct cache_set *c, struct jset *j, struct closure *cl) | |
377 | { | |
378 | struct bkey *k = &j->uuid_bucket; | |
379 | ||
65d45231 | 380 | if (__bch_btree_ptr_invalid(c, k)) |
cafe5635 KO |
381 | return "bad uuid pointer"; |
382 | ||
383 | bkey_copy(&c->uuid_bucket, k); | |
ad0d9e76 | 384 | uuid_io(c, REQ_OP_READ, READ_SYNC, k, cl); |
cafe5635 KO |
385 | |
386 | if (j->version < BCACHE_JSET_VERSION_UUIDv1) { | |
387 | struct uuid_entry_v0 *u0 = (void *) c->uuids; | |
388 | struct uuid_entry *u1 = (void *) c->uuids; | |
389 | int i; | |
390 | ||
391 | closure_sync(cl); | |
392 | ||
393 | /* | |
394 | * Since the new uuid entry is bigger than the old, we have to | |
395 | * convert starting at the highest memory address and work down | |
396 | * in order to do it in place | |
397 | */ | |
398 | ||
399 | for (i = c->nr_uuids - 1; | |
400 | i >= 0; | |
401 | --i) { | |
402 | memcpy(u1[i].uuid, u0[i].uuid, 16); | |
403 | memcpy(u1[i].label, u0[i].label, 32); | |
404 | ||
405 | u1[i].first_reg = u0[i].first_reg; | |
406 | u1[i].last_reg = u0[i].last_reg; | |
407 | u1[i].invalidated = u0[i].invalidated; | |
408 | ||
409 | u1[i].flags = 0; | |
410 | u1[i].sectors = 0; | |
411 | } | |
412 | } | |
413 | ||
414 | return NULL; | |
415 | } | |
416 | ||
417 | static int __uuid_write(struct cache_set *c) | |
418 | { | |
419 | BKEY_PADDED(key) k; | |
420 | struct closure cl; | |
421 | closure_init_stack(&cl); | |
422 | ||
423 | lockdep_assert_held(&bch_register_lock); | |
424 | ||
78365411 | 425 | if (bch_bucket_alloc_set(c, RESERVE_BTREE, &k.key, 1, true)) |
cafe5635 KO |
426 | return 1; |
427 | ||
428 | SET_KEY_SIZE(&k.key, c->sb.bucket_size); | |
ad0d9e76 | 429 | uuid_io(c, REQ_OP_WRITE, 0, &k.key, &cl); |
cafe5635 KO |
430 | closure_sync(&cl); |
431 | ||
432 | bkey_copy(&c->uuid_bucket, &k.key); | |
3a3b6a4e | 433 | bkey_put(c, &k.key); |
cafe5635 KO |
434 | return 0; |
435 | } | |
436 | ||
437 | int bch_uuid_write(struct cache_set *c) | |
438 | { | |
439 | int ret = __uuid_write(c); | |
440 | ||
441 | if (!ret) | |
442 | bch_journal_meta(c, NULL); | |
443 | ||
444 | return ret; | |
445 | } | |
446 | ||
447 | static struct uuid_entry *uuid_find(struct cache_set *c, const char *uuid) | |
448 | { | |
449 | struct uuid_entry *u; | |
450 | ||
451 | for (u = c->uuids; | |
452 | u < c->uuids + c->nr_uuids; u++) | |
453 | if (!memcmp(u->uuid, uuid, 16)) | |
454 | return u; | |
455 | ||
456 | return NULL; | |
457 | } | |
458 | ||
459 | static struct uuid_entry *uuid_find_empty(struct cache_set *c) | |
460 | { | |
461 | static const char zero_uuid[16] = "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"; | |
462 | return uuid_find(c, zero_uuid); | |
463 | } | |
464 | ||
465 | /* | |
466 | * Bucket priorities/gens: | |
467 | * | |
468 | * For each bucket, we store on disk its | |
469 | * 8 bit gen | |
470 | * 16 bit priority | |
471 | * | |
472 | * See alloc.c for an explanation of the gen. The priority is used to implement | |
473 | * lru (and in the future other) cache replacement policies; for most purposes | |
474 | * it's just an opaque integer. | |
475 | * | |
476 | * The gens and the priorities don't have a whole lot to do with each other, and | |
477 | * it's actually the gens that must be written out at specific times - it's no | |
478 | * big deal if the priorities don't get written, if we lose them we just reuse | |
479 | * buckets in suboptimal order. | |
480 | * | |
481 | * On disk they're stored in a packed array, and in as many buckets are required | |
482 | * to fit them all. The buckets we use to store them form a list; the journal | |
483 | * header points to the first bucket, the first bucket points to the second | |
484 | * bucket, et cetera. | |
485 | * | |
486 | * This code is used by the allocation code; periodically (whenever it runs out | |
487 | * of buckets to allocate from) the allocation code will invalidate some | |
488 | * buckets, but it can't use those buckets until their new gens are safely on | |
489 | * disk. | |
490 | */ | |
491 | ||
4246a0b6 | 492 | static void prio_endio(struct bio *bio) |
cafe5635 KO |
493 | { |
494 | struct cache *ca = bio->bi_private; | |
495 | ||
4246a0b6 | 496 | cache_set_err_on(bio->bi_error, ca->set, "accessing priorities"); |
cafe5635 KO |
497 | bch_bbio_free(bio, ca->set); |
498 | closure_put(&ca->prio); | |
499 | } | |
500 | ||
ad0d9e76 MC |
501 | static void prio_io(struct cache *ca, uint64_t bucket, int op, |
502 | unsigned long op_flags) | |
cafe5635 KO |
503 | { |
504 | struct closure *cl = &ca->prio; | |
505 | struct bio *bio = bch_bbio_alloc(ca->set); | |
506 | ||
507 | closure_init_stack(cl); | |
508 | ||
4f024f37 KO |
509 | bio->bi_iter.bi_sector = bucket * ca->sb.bucket_size; |
510 | bio->bi_bdev = ca->bdev; | |
4f024f37 | 511 | bio->bi_iter.bi_size = bucket_bytes(ca); |
cafe5635 KO |
512 | |
513 | bio->bi_end_io = prio_endio; | |
514 | bio->bi_private = ca; | |
ad0d9e76 | 515 | bio_set_op_attrs(bio, op, REQ_SYNC|REQ_META|op_flags); |
169ef1cf | 516 | bch_bio_map(bio, ca->disk_buckets); |
cafe5635 | 517 | |
749b61da | 518 | closure_bio_submit(bio, &ca->prio); |
cafe5635 KO |
519 | closure_sync(cl); |
520 | } | |
521 | ||
cafe5635 KO |
522 | void bch_prio_write(struct cache *ca) |
523 | { | |
524 | int i; | |
525 | struct bucket *b; | |
526 | struct closure cl; | |
527 | ||
528 | closure_init_stack(&cl); | |
529 | ||
530 | lockdep_assert_held(&ca->set->bucket_lock); | |
531 | ||
cafe5635 KO |
532 | ca->disk_buckets->seq++; |
533 | ||
534 | atomic_long_add(ca->sb.bucket_size * prio_buckets(ca), | |
535 | &ca->meta_sectors_written); | |
536 | ||
78365411 KO |
537 | //pr_debug("free %zu, free_inc %zu, unused %zu", fifo_used(&ca->free), |
538 | // fifo_used(&ca->free_inc), fifo_used(&ca->unused)); | |
cafe5635 KO |
539 | |
540 | for (i = prio_buckets(ca) - 1; i >= 0; --i) { | |
541 | long bucket; | |
542 | struct prio_set *p = ca->disk_buckets; | |
b1a67b0f KO |
543 | struct bucket_disk *d = p->data; |
544 | struct bucket_disk *end = d + prios_per_bucket(ca); | |
cafe5635 KO |
545 | |
546 | for (b = ca->buckets + i * prios_per_bucket(ca); | |
547 | b < ca->buckets + ca->sb.nbuckets && d < end; | |
548 | b++, d++) { | |
549 | d->prio = cpu_to_le16(b->prio); | |
550 | d->gen = b->gen; | |
551 | } | |
552 | ||
553 | p->next_bucket = ca->prio_buckets[i + 1]; | |
81ab4190 | 554 | p->magic = pset_magic(&ca->sb); |
169ef1cf | 555 | p->csum = bch_crc64(&p->magic, bucket_bytes(ca) - 8); |
cafe5635 | 556 | |
78365411 | 557 | bucket = bch_bucket_alloc(ca, RESERVE_PRIO, true); |
cafe5635 KO |
558 | BUG_ON(bucket == -1); |
559 | ||
560 | mutex_unlock(&ca->set->bucket_lock); | |
ad0d9e76 | 561 | prio_io(ca, bucket, REQ_OP_WRITE, 0); |
cafe5635 KO |
562 | mutex_lock(&ca->set->bucket_lock); |
563 | ||
564 | ca->prio_buckets[i] = bucket; | |
565 | atomic_dec_bug(&ca->buckets[bucket].pin); | |
566 | } | |
567 | ||
568 | mutex_unlock(&ca->set->bucket_lock); | |
569 | ||
570 | bch_journal_meta(ca->set, &cl); | |
571 | closure_sync(&cl); | |
572 | ||
573 | mutex_lock(&ca->set->bucket_lock); | |
574 | ||
cafe5635 KO |
575 | /* |
576 | * Don't want the old priorities to get garbage collected until after we | |
577 | * finish writing the new ones, and they're journalled | |
578 | */ | |
2531d9ee KO |
579 | for (i = 0; i < prio_buckets(ca); i++) { |
580 | if (ca->prio_last_buckets[i]) | |
581 | __bch_bucket_free(ca, | |
582 | &ca->buckets[ca->prio_last_buckets[i]]); | |
583 | ||
cafe5635 | 584 | ca->prio_last_buckets[i] = ca->prio_buckets[i]; |
2531d9ee | 585 | } |
cafe5635 KO |
586 | } |
587 | ||
588 | static void prio_read(struct cache *ca, uint64_t bucket) | |
589 | { | |
590 | struct prio_set *p = ca->disk_buckets; | |
591 | struct bucket_disk *d = p->data + prios_per_bucket(ca), *end = d; | |
592 | struct bucket *b; | |
593 | unsigned bucket_nr = 0; | |
594 | ||
595 | for (b = ca->buckets; | |
596 | b < ca->buckets + ca->sb.nbuckets; | |
597 | b++, d++) { | |
598 | if (d == end) { | |
599 | ca->prio_buckets[bucket_nr] = bucket; | |
600 | ca->prio_last_buckets[bucket_nr] = bucket; | |
601 | bucket_nr++; | |
602 | ||
ad0d9e76 | 603 | prio_io(ca, bucket, REQ_OP_READ, READ_SYNC); |
cafe5635 | 604 | |
169ef1cf | 605 | if (p->csum != bch_crc64(&p->magic, bucket_bytes(ca) - 8)) |
cafe5635 KO |
606 | pr_warn("bad csum reading priorities"); |
607 | ||
81ab4190 | 608 | if (p->magic != pset_magic(&ca->sb)) |
cafe5635 KO |
609 | pr_warn("bad magic reading priorities"); |
610 | ||
611 | bucket = p->next_bucket; | |
612 | d = p->data; | |
613 | } | |
614 | ||
615 | b->prio = le16_to_cpu(d->prio); | |
3a2fd9d5 | 616 | b->gen = b->last_gc = d->gen; |
cafe5635 KO |
617 | } |
618 | } | |
619 | ||
620 | /* Bcache device */ | |
621 | ||
622 | static int open_dev(struct block_device *b, fmode_t mode) | |
623 | { | |
624 | struct bcache_device *d = b->bd_disk->private_data; | |
c4d951dd | 625 | if (test_bit(BCACHE_DEV_CLOSING, &d->flags)) |
cafe5635 KO |
626 | return -ENXIO; |
627 | ||
628 | closure_get(&d->cl); | |
629 | return 0; | |
630 | } | |
631 | ||
867e1162 | 632 | static void release_dev(struct gendisk *b, fmode_t mode) |
cafe5635 KO |
633 | { |
634 | struct bcache_device *d = b->private_data; | |
635 | closure_put(&d->cl); | |
cafe5635 KO |
636 | } |
637 | ||
638 | static int ioctl_dev(struct block_device *b, fmode_t mode, | |
639 | unsigned int cmd, unsigned long arg) | |
640 | { | |
641 | struct bcache_device *d = b->bd_disk->private_data; | |
642 | return d->ioctl(d, mode, cmd, arg); | |
643 | } | |
644 | ||
645 | static const struct block_device_operations bcache_ops = { | |
646 | .open = open_dev, | |
647 | .release = release_dev, | |
648 | .ioctl = ioctl_dev, | |
649 | .owner = THIS_MODULE, | |
650 | }; | |
651 | ||
652 | void bcache_device_stop(struct bcache_device *d) | |
653 | { | |
c4d951dd | 654 | if (!test_and_set_bit(BCACHE_DEV_CLOSING, &d->flags)) |
cafe5635 KO |
655 | closure_queue(&d->cl); |
656 | } | |
657 | ||
ee668506 KO |
658 | static void bcache_device_unlink(struct bcache_device *d) |
659 | { | |
c4d951dd | 660 | lockdep_assert_held(&bch_register_lock); |
ee668506 | 661 | |
c4d951dd KO |
662 | if (d->c && !test_and_set_bit(BCACHE_DEV_UNLINK_DONE, &d->flags)) { |
663 | unsigned i; | |
664 | struct cache *ca; | |
ee668506 | 665 | |
c4d951dd KO |
666 | sysfs_remove_link(&d->c->kobj, d->name); |
667 | sysfs_remove_link(&d->kobj, "cache"); | |
668 | ||
669 | for_each_cache(ca, d->c, i) | |
670 | bd_unlink_disk_holder(ca->bdev, d->disk); | |
671 | } | |
ee668506 KO |
672 | } |
673 | ||
674 | static void bcache_device_link(struct bcache_device *d, struct cache_set *c, | |
675 | const char *name) | |
676 | { | |
677 | unsigned i; | |
678 | struct cache *ca; | |
679 | ||
680 | for_each_cache(ca, d->c, i) | |
681 | bd_link_disk_holder(ca->bdev, d->disk); | |
682 | ||
683 | snprintf(d->name, BCACHEDEVNAME_SIZE, | |
684 | "%s%u", name, d->id); | |
685 | ||
686 | WARN(sysfs_create_link(&d->kobj, &c->kobj, "cache") || | |
687 | sysfs_create_link(&c->kobj, &d->kobj, d->name), | |
688 | "Couldn't create device <-> cache set symlinks"); | |
fecaee6f ZL |
689 | |
690 | clear_bit(BCACHE_DEV_UNLINK_DONE, &d->flags); | |
ee668506 KO |
691 | } |
692 | ||
cafe5635 KO |
693 | static void bcache_device_detach(struct bcache_device *d) |
694 | { | |
695 | lockdep_assert_held(&bch_register_lock); | |
696 | ||
c4d951dd | 697 | if (test_bit(BCACHE_DEV_DETACHING, &d->flags)) { |
cafe5635 KO |
698 | struct uuid_entry *u = d->c->uuids + d->id; |
699 | ||
700 | SET_UUID_FLASH_ONLY(u, 0); | |
701 | memcpy(u->uuid, invalid_uuid, 16); | |
702 | u->invalidated = cpu_to_le32(get_seconds()); | |
703 | bch_uuid_write(d->c); | |
cafe5635 KO |
704 | } |
705 | ||
c4d951dd | 706 | bcache_device_unlink(d); |
ee668506 | 707 | |
cafe5635 KO |
708 | d->c->devices[d->id] = NULL; |
709 | closure_put(&d->c->caching); | |
710 | d->c = NULL; | |
711 | } | |
712 | ||
713 | static void bcache_device_attach(struct bcache_device *d, struct cache_set *c, | |
714 | unsigned id) | |
715 | { | |
cafe5635 KO |
716 | d->id = id; |
717 | d->c = c; | |
718 | c->devices[id] = d; | |
719 | ||
720 | closure_get(&c->caching); | |
721 | } | |
722 | ||
cafe5635 KO |
723 | static void bcache_device_free(struct bcache_device *d) |
724 | { | |
725 | lockdep_assert_held(&bch_register_lock); | |
726 | ||
727 | pr_info("%s stopped", d->disk->disk_name); | |
728 | ||
729 | if (d->c) | |
730 | bcache_device_detach(d); | |
f59fce84 | 731 | if (d->disk && d->disk->flags & GENHD_FL_UP) |
cafe5635 KO |
732 | del_gendisk(d->disk); |
733 | if (d->disk && d->disk->queue) | |
734 | blk_cleanup_queue(d->disk->queue); | |
28935ab5 KO |
735 | if (d->disk) { |
736 | ida_simple_remove(&bcache_minor, d->disk->first_minor); | |
cafe5635 | 737 | put_disk(d->disk); |
28935ab5 | 738 | } |
cafe5635 | 739 | |
cafe5635 KO |
740 | if (d->bio_split) |
741 | bioset_free(d->bio_split); | |
958b4338 PE |
742 | kvfree(d->full_dirty_stripes); |
743 | kvfree(d->stripe_sectors_dirty); | |
cafe5635 KO |
744 | |
745 | closure_debug_destroy(&d->cl); | |
746 | } | |
747 | ||
279afbad KO |
748 | static int bcache_device_init(struct bcache_device *d, unsigned block_size, |
749 | sector_t sectors) | |
cafe5635 KO |
750 | { |
751 | struct request_queue *q; | |
279afbad | 752 | size_t n; |
28935ab5 | 753 | int minor; |
279afbad | 754 | |
2d679fc7 KO |
755 | if (!d->stripe_size) |
756 | d->stripe_size = 1 << 31; | |
279afbad | 757 | |
2d679fc7 | 758 | d->nr_stripes = DIV_ROUND_UP_ULL(sectors, d->stripe_size); |
279afbad | 759 | |
48a915a8 KO |
760 | if (!d->nr_stripes || |
761 | d->nr_stripes > INT_MAX || | |
762 | d->nr_stripes > SIZE_MAX / sizeof(atomic_t)) { | |
763 | pr_err("nr_stripes too large"); | |
279afbad | 764 | return -ENOMEM; |
48a915a8 | 765 | } |
279afbad KO |
766 | |
767 | n = d->nr_stripes * sizeof(atomic_t); | |
768 | d->stripe_sectors_dirty = n < PAGE_SIZE << 6 | |
769 | ? kzalloc(n, GFP_KERNEL) | |
770 | : vzalloc(n); | |
771 | if (!d->stripe_sectors_dirty) | |
772 | return -ENOMEM; | |
cafe5635 | 773 | |
48a915a8 KO |
774 | n = BITS_TO_LONGS(d->nr_stripes) * sizeof(unsigned long); |
775 | d->full_dirty_stripes = n < PAGE_SIZE << 6 | |
776 | ? kzalloc(n, GFP_KERNEL) | |
777 | : vzalloc(n); | |
778 | if (!d->full_dirty_stripes) | |
779 | return -ENOMEM; | |
780 | ||
28935ab5 KO |
781 | minor = ida_simple_get(&bcache_minor, 0, MINORMASK + 1, GFP_KERNEL); |
782 | if (minor < 0) | |
783 | return minor; | |
784 | ||
cafe5635 | 785 | if (!(d->bio_split = bioset_create(4, offsetof(struct bbio, bio))) || |
28935ab5 KO |
786 | !(d->disk = alloc_disk(1))) { |
787 | ida_simple_remove(&bcache_minor, minor); | |
cafe5635 | 788 | return -ENOMEM; |
28935ab5 | 789 | } |
cafe5635 | 790 | |
279afbad | 791 | set_capacity(d->disk, sectors); |
28935ab5 | 792 | snprintf(d->disk->disk_name, DISK_NAME_LEN, "bcache%i", minor); |
cafe5635 KO |
793 | |
794 | d->disk->major = bcache_major; | |
28935ab5 | 795 | d->disk->first_minor = minor; |
cafe5635 KO |
796 | d->disk->fops = &bcache_ops; |
797 | d->disk->private_data = d; | |
798 | ||
28935ab5 KO |
799 | q = blk_alloc_queue(GFP_KERNEL); |
800 | if (!q) | |
801 | return -ENOMEM; | |
802 | ||
cafe5635 KO |
803 | blk_queue_make_request(q, NULL); |
804 | d->disk->queue = q; | |
805 | q->queuedata = d; | |
806 | q->backing_dev_info.congested_data = d; | |
807 | q->limits.max_hw_sectors = UINT_MAX; | |
808 | q->limits.max_sectors = UINT_MAX; | |
809 | q->limits.max_segment_size = UINT_MAX; | |
810 | q->limits.max_segments = BIO_MAX_PAGES; | |
2bb4cd5c | 811 | blk_queue_max_discard_sectors(q, UINT_MAX); |
90db6919 | 812 | q->limits.discard_granularity = 512; |
cafe5635 KO |
813 | q->limits.io_min = block_size; |
814 | q->limits.logical_block_size = block_size; | |
815 | q->limits.physical_block_size = block_size; | |
816 | set_bit(QUEUE_FLAG_NONROT, &d->disk->queue->queue_flags); | |
b277da0a | 817 | clear_bit(QUEUE_FLAG_ADD_RANDOM, &d->disk->queue->queue_flags); |
cafe5635 KO |
818 | set_bit(QUEUE_FLAG_DISCARD, &d->disk->queue->queue_flags); |
819 | ||
84b4ff9e | 820 | blk_queue_write_cache(q, true, true); |
54d12f2b | 821 | |
cafe5635 KO |
822 | return 0; |
823 | } | |
824 | ||
825 | /* Cached device */ | |
826 | ||
827 | static void calc_cached_dev_sectors(struct cache_set *c) | |
828 | { | |
829 | uint64_t sectors = 0; | |
830 | struct cached_dev *dc; | |
831 | ||
832 | list_for_each_entry(dc, &c->cached_devs, list) | |
833 | sectors += bdev_sectors(dc->bdev); | |
834 | ||
835 | c->cached_dev_sectors = sectors; | |
836 | } | |
837 | ||
838 | void bch_cached_dev_run(struct cached_dev *dc) | |
839 | { | |
840 | struct bcache_device *d = &dc->disk; | |
ab9e1400 | 841 | char buf[SB_LABEL_SIZE + 1]; |
a25c32be GP |
842 | char *env[] = { |
843 | "DRIVER=bcache", | |
844 | kasprintf(GFP_KERNEL, "CACHED_UUID=%pU", dc->sb.uuid), | |
ab9e1400 GP |
845 | NULL, |
846 | NULL, | |
a25c32be | 847 | }; |
cafe5635 | 848 | |
ab9e1400 GP |
849 | memcpy(buf, dc->sb.label, SB_LABEL_SIZE); |
850 | buf[SB_LABEL_SIZE] = '\0'; | |
851 | env[2] = kasprintf(GFP_KERNEL, "CACHED_LABEL=%s", buf); | |
852 | ||
4d4d8573 AV |
853 | if (atomic_xchg(&dc->running, 1)) { |
854 | kfree(env[1]); | |
855 | kfree(env[2]); | |
cafe5635 | 856 | return; |
4d4d8573 | 857 | } |
cafe5635 KO |
858 | |
859 | if (!d->c && | |
860 | BDEV_STATE(&dc->sb) != BDEV_STATE_NONE) { | |
861 | struct closure cl; | |
862 | closure_init_stack(&cl); | |
863 | ||
864 | SET_BDEV_STATE(&dc->sb, BDEV_STATE_STALE); | |
865 | bch_write_bdev_super(dc, &cl); | |
866 | closure_sync(&cl); | |
867 | } | |
868 | ||
869 | add_disk(d->disk); | |
ee668506 | 870 | bd_link_disk_holder(dc->bdev, dc->disk.disk); |
a25c32be GP |
871 | /* won't show up in the uevent file, use udevadm monitor -e instead |
872 | * only class / kset properties are persistent */ | |
cafe5635 | 873 | kobject_uevent_env(&disk_to_dev(d->disk)->kobj, KOBJ_CHANGE, env); |
a25c32be | 874 | kfree(env[1]); |
ab9e1400 | 875 | kfree(env[2]); |
a25c32be | 876 | |
cafe5635 KO |
877 | if (sysfs_create_link(&d->kobj, &disk_to_dev(d->disk)->kobj, "dev") || |
878 | sysfs_create_link(&disk_to_dev(d->disk)->kobj, &d->kobj, "bcache")) | |
879 | pr_debug("error creating sysfs link"); | |
880 | } | |
881 | ||
882 | static void cached_dev_detach_finish(struct work_struct *w) | |
883 | { | |
884 | struct cached_dev *dc = container_of(w, struct cached_dev, detach); | |
885 | char buf[BDEVNAME_SIZE]; | |
886 | struct closure cl; | |
887 | closure_init_stack(&cl); | |
888 | ||
c4d951dd | 889 | BUG_ON(!test_bit(BCACHE_DEV_DETACHING, &dc->disk.flags)); |
cafe5635 KO |
890 | BUG_ON(atomic_read(&dc->count)); |
891 | ||
cafe5635 KO |
892 | mutex_lock(&bch_register_lock); |
893 | ||
894 | memset(&dc->sb.set_uuid, 0, 16); | |
895 | SET_BDEV_STATE(&dc->sb, BDEV_STATE_NONE); | |
896 | ||
897 | bch_write_bdev_super(dc, &cl); | |
898 | closure_sync(&cl); | |
899 | ||
900 | bcache_device_detach(&dc->disk); | |
901 | list_move(&dc->list, &uncached_devices); | |
902 | ||
c4d951dd | 903 | clear_bit(BCACHE_DEV_DETACHING, &dc->disk.flags); |
5b1016e6 | 904 | clear_bit(BCACHE_DEV_UNLINK_DONE, &dc->disk.flags); |
c4d951dd | 905 | |
cafe5635 KO |
906 | mutex_unlock(&bch_register_lock); |
907 | ||
908 | pr_info("Caching disabled for %s", bdevname(dc->bdev, buf)); | |
909 | ||
910 | /* Drop ref we took in cached_dev_detach() */ | |
911 | closure_put(&dc->disk.cl); | |
912 | } | |
913 | ||
914 | void bch_cached_dev_detach(struct cached_dev *dc) | |
915 | { | |
916 | lockdep_assert_held(&bch_register_lock); | |
917 | ||
c4d951dd | 918 | if (test_bit(BCACHE_DEV_CLOSING, &dc->disk.flags)) |
cafe5635 KO |
919 | return; |
920 | ||
c4d951dd | 921 | if (test_and_set_bit(BCACHE_DEV_DETACHING, &dc->disk.flags)) |
cafe5635 KO |
922 | return; |
923 | ||
924 | /* | |
925 | * Block the device from being closed and freed until we're finished | |
926 | * detaching | |
927 | */ | |
928 | closure_get(&dc->disk.cl); | |
929 | ||
930 | bch_writeback_queue(dc); | |
931 | cached_dev_put(dc); | |
932 | } | |
933 | ||
934 | int bch_cached_dev_attach(struct cached_dev *dc, struct cache_set *c) | |
935 | { | |
936 | uint32_t rtime = cpu_to_le32(get_seconds()); | |
937 | struct uuid_entry *u; | |
938 | char buf[BDEVNAME_SIZE]; | |
939 | ||
940 | bdevname(dc->bdev, buf); | |
941 | ||
942 | if (memcmp(dc->sb.set_uuid, c->sb.set_uuid, 16)) | |
943 | return -ENOENT; | |
944 | ||
945 | if (dc->disk.c) { | |
946 | pr_err("Can't attach %s: already attached", buf); | |
947 | return -EINVAL; | |
948 | } | |
949 | ||
950 | if (test_bit(CACHE_SET_STOPPING, &c->flags)) { | |
951 | pr_err("Can't attach %s: shutting down", buf); | |
952 | return -EINVAL; | |
953 | } | |
954 | ||
955 | if (dc->sb.block_size < c->sb.block_size) { | |
956 | /* Will die */ | |
b1a67b0f KO |
957 | pr_err("Couldn't attach %s: block size less than set's block size", |
958 | buf); | |
cafe5635 KO |
959 | return -EINVAL; |
960 | } | |
961 | ||
962 | u = uuid_find(c, dc->sb.uuid); | |
963 | ||
964 | if (u && | |
965 | (BDEV_STATE(&dc->sb) == BDEV_STATE_STALE || | |
966 | BDEV_STATE(&dc->sb) == BDEV_STATE_NONE)) { | |
967 | memcpy(u->uuid, invalid_uuid, 16); | |
968 | u->invalidated = cpu_to_le32(get_seconds()); | |
969 | u = NULL; | |
970 | } | |
971 | ||
972 | if (!u) { | |
973 | if (BDEV_STATE(&dc->sb) == BDEV_STATE_DIRTY) { | |
974 | pr_err("Couldn't find uuid for %s in set", buf); | |
975 | return -ENOENT; | |
976 | } | |
977 | ||
978 | u = uuid_find_empty(c); | |
979 | if (!u) { | |
980 | pr_err("Not caching %s, no room for UUID", buf); | |
981 | return -EINVAL; | |
982 | } | |
983 | } | |
984 | ||
985 | /* Deadlocks since we're called via sysfs... | |
986 | sysfs_remove_file(&dc->kobj, &sysfs_attach); | |
987 | */ | |
988 | ||
169ef1cf | 989 | if (bch_is_zero(u->uuid, 16)) { |
cafe5635 KO |
990 | struct closure cl; |
991 | closure_init_stack(&cl); | |
992 | ||
993 | memcpy(u->uuid, dc->sb.uuid, 16); | |
994 | memcpy(u->label, dc->sb.label, SB_LABEL_SIZE); | |
995 | u->first_reg = u->last_reg = rtime; | |
996 | bch_uuid_write(c); | |
997 | ||
998 | memcpy(dc->sb.set_uuid, c->sb.set_uuid, 16); | |
999 | SET_BDEV_STATE(&dc->sb, BDEV_STATE_CLEAN); | |
1000 | ||
1001 | bch_write_bdev_super(dc, &cl); | |
1002 | closure_sync(&cl); | |
1003 | } else { | |
1004 | u->last_reg = rtime; | |
1005 | bch_uuid_write(c); | |
1006 | } | |
1007 | ||
1008 | bcache_device_attach(&dc->disk, c, u - c->uuids); | |
cafe5635 KO |
1009 | list_move(&dc->list, &c->cached_devs); |
1010 | calc_cached_dev_sectors(c); | |
1011 | ||
1012 | smp_wmb(); | |
1013 | /* | |
1014 | * dc->c must be set before dc->count != 0 - paired with the mb in | |
1015 | * cached_dev_get() | |
1016 | */ | |
1017 | atomic_set(&dc->count, 1); | |
1018 | ||
07cc6ef8 EW |
1019 | /* Block writeback thread, but spawn it */ |
1020 | down_write(&dc->writeback_lock); | |
1021 | if (bch_cached_dev_writeback_start(dc)) { | |
1022 | up_write(&dc->writeback_lock); | |
9e5c3535 | 1023 | return -ENOMEM; |
07cc6ef8 | 1024 | } |
9e5c3535 | 1025 | |
cafe5635 | 1026 | if (BDEV_STATE(&dc->sb) == BDEV_STATE_DIRTY) { |
444fc0b6 | 1027 | bch_sectors_dirty_init(dc); |
cafe5635 KO |
1028 | atomic_set(&dc->has_dirty, 1); |
1029 | atomic_inc(&dc->count); | |
1030 | bch_writeback_queue(dc); | |
1031 | } | |
1032 | ||
1033 | bch_cached_dev_run(dc); | |
ee668506 | 1034 | bcache_device_link(&dc->disk, c, "bdev"); |
cafe5635 | 1035 | |
07cc6ef8 EW |
1036 | /* Allow the writeback thread to proceed */ |
1037 | up_write(&dc->writeback_lock); | |
1038 | ||
cafe5635 KO |
1039 | pr_info("Caching %s as %s on set %pU", |
1040 | bdevname(dc->bdev, buf), dc->disk.disk->disk_name, | |
1041 | dc->disk.c->sb.set_uuid); | |
1042 | return 0; | |
1043 | } | |
1044 | ||
1045 | void bch_cached_dev_release(struct kobject *kobj) | |
1046 | { | |
1047 | struct cached_dev *dc = container_of(kobj, struct cached_dev, | |
1048 | disk.kobj); | |
1049 | kfree(dc); | |
1050 | module_put(THIS_MODULE); | |
1051 | } | |
1052 | ||
1053 | static void cached_dev_free(struct closure *cl) | |
1054 | { | |
1055 | struct cached_dev *dc = container_of(cl, struct cached_dev, disk.cl); | |
1056 | ||
1057 | cancel_delayed_work_sync(&dc->writeback_rate_update); | |
a664d0f0 SP |
1058 | if (!IS_ERR_OR_NULL(dc->writeback_thread)) |
1059 | kthread_stop(dc->writeback_thread); | |
cafe5635 KO |
1060 | |
1061 | mutex_lock(&bch_register_lock); | |
1062 | ||
f59fce84 KO |
1063 | if (atomic_read(&dc->running)) |
1064 | bd_unlink_disk_holder(dc->bdev, dc->disk.disk); | |
cafe5635 KO |
1065 | bcache_device_free(&dc->disk); |
1066 | list_del(&dc->list); | |
1067 | ||
1068 | mutex_unlock(&bch_register_lock); | |
1069 | ||
0781c874 | 1070 | if (!IS_ERR_OR_NULL(dc->bdev)) |
cafe5635 | 1071 | blkdev_put(dc->bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL); |
cafe5635 KO |
1072 | |
1073 | wake_up(&unregister_wait); | |
1074 | ||
1075 | kobject_put(&dc->disk.kobj); | |
1076 | } | |
1077 | ||
1078 | static void cached_dev_flush(struct closure *cl) | |
1079 | { | |
1080 | struct cached_dev *dc = container_of(cl, struct cached_dev, disk.cl); | |
1081 | struct bcache_device *d = &dc->disk; | |
1082 | ||
c9502ea4 | 1083 | mutex_lock(&bch_register_lock); |
c4d951dd | 1084 | bcache_device_unlink(d); |
c9502ea4 KO |
1085 | mutex_unlock(&bch_register_lock); |
1086 | ||
cafe5635 KO |
1087 | bch_cache_accounting_destroy(&dc->accounting); |
1088 | kobject_del(&d->kobj); | |
1089 | ||
1090 | continue_at(cl, cached_dev_free, system_wq); | |
1091 | } | |
1092 | ||
1093 | static int cached_dev_init(struct cached_dev *dc, unsigned block_size) | |
1094 | { | |
f59fce84 | 1095 | int ret; |
cafe5635 | 1096 | struct io *io; |
f59fce84 | 1097 | struct request_queue *q = bdev_get_queue(dc->bdev); |
cafe5635 KO |
1098 | |
1099 | __module_get(THIS_MODULE); | |
1100 | INIT_LIST_HEAD(&dc->list); | |
f59fce84 KO |
1101 | closure_init(&dc->disk.cl, NULL); |
1102 | set_closure_fn(&dc->disk.cl, cached_dev_flush, system_wq); | |
cafe5635 | 1103 | kobject_init(&dc->disk.kobj, &bch_cached_dev_ktype); |
cafe5635 | 1104 | INIT_WORK(&dc->detach, cached_dev_detach_finish); |
cb7a583e | 1105 | sema_init(&dc->sb_write_mutex, 1); |
f59fce84 KO |
1106 | INIT_LIST_HEAD(&dc->io_lru); |
1107 | spin_lock_init(&dc->io_lock); | |
1108 | bch_cache_accounting_init(&dc->accounting, &dc->disk.cl); | |
cafe5635 | 1109 | |
cafe5635 KO |
1110 | dc->sequential_cutoff = 4 << 20; |
1111 | ||
cafe5635 KO |
1112 | for (io = dc->io; io < dc->io + RECENT_IO; io++) { |
1113 | list_add(&io->lru, &dc->io_lru); | |
1114 | hlist_add_head(&io->hash, dc->io_hash + RECENT_IO); | |
1115 | } | |
1116 | ||
c78afc62 KO |
1117 | dc->disk.stripe_size = q->limits.io_opt >> 9; |
1118 | ||
1119 | if (dc->disk.stripe_size) | |
1120 | dc->partial_stripes_expensive = | |
1121 | q->limits.raid_partial_stripes_expensive; | |
1122 | ||
279afbad KO |
1123 | ret = bcache_device_init(&dc->disk, block_size, |
1124 | dc->bdev->bd_part->nr_sects - dc->sb.data_offset); | |
f59fce84 KO |
1125 | if (ret) |
1126 | return ret; | |
1127 | ||
1128 | set_capacity(dc->disk.disk, | |
1129 | dc->bdev->bd_part->nr_sects - dc->sb.data_offset); | |
1130 | ||
1131 | dc->disk.disk->queue->backing_dev_info.ra_pages = | |
1132 | max(dc->disk.disk->queue->backing_dev_info.ra_pages, | |
1133 | q->backing_dev_info.ra_pages); | |
1134 | ||
1135 | bch_cached_dev_request_init(dc); | |
1136 | bch_cached_dev_writeback_init(dc); | |
cafe5635 | 1137 | return 0; |
cafe5635 KO |
1138 | } |
1139 | ||
1140 | /* Cached device - bcache superblock */ | |
1141 | ||
f59fce84 | 1142 | static void register_bdev(struct cache_sb *sb, struct page *sb_page, |
cafe5635 KO |
1143 | struct block_device *bdev, |
1144 | struct cached_dev *dc) | |
1145 | { | |
1146 | char name[BDEVNAME_SIZE]; | |
1147 | const char *err = "cannot allocate memory"; | |
cafe5635 KO |
1148 | struct cache_set *c; |
1149 | ||
cafe5635 | 1150 | memcpy(&dc->sb, sb, sizeof(struct cache_sb)); |
cafe5635 KO |
1151 | dc->bdev = bdev; |
1152 | dc->bdev->bd_holder = dc; | |
1153 | ||
f59fce84 KO |
1154 | bio_init(&dc->sb_bio); |
1155 | dc->sb_bio.bi_max_vecs = 1; | |
1156 | dc->sb_bio.bi_io_vec = dc->sb_bio.bi_inline_vecs; | |
1157 | dc->sb_bio.bi_io_vec[0].bv_page = sb_page; | |
1158 | get_page(sb_page); | |
4f0fd955 | 1159 | |
f59fce84 KO |
1160 | if (cached_dev_init(dc, sb->block_size << 9)) |
1161 | goto err; | |
cafe5635 KO |
1162 | |
1163 | err = "error creating kobject"; | |
1164 | if (kobject_add(&dc->disk.kobj, &part_to_dev(bdev->bd_part)->kobj, | |
1165 | "bcache")) | |
1166 | goto err; | |
1167 | if (bch_cache_accounting_add_kobjs(&dc->accounting, &dc->disk.kobj)) | |
1168 | goto err; | |
1169 | ||
f59fce84 KO |
1170 | pr_info("registered backing device %s", bdevname(bdev, name)); |
1171 | ||
cafe5635 KO |
1172 | list_add(&dc->list, &uncached_devices); |
1173 | list_for_each_entry(c, &bch_cache_sets, list) | |
1174 | bch_cached_dev_attach(dc, c); | |
1175 | ||
1176 | if (BDEV_STATE(&dc->sb) == BDEV_STATE_NONE || | |
1177 | BDEV_STATE(&dc->sb) == BDEV_STATE_STALE) | |
1178 | bch_cached_dev_run(dc); | |
1179 | ||
f59fce84 | 1180 | return; |
cafe5635 | 1181 | err: |
cafe5635 | 1182 | pr_notice("error opening %s: %s", bdevname(bdev, name), err); |
f59fce84 | 1183 | bcache_device_stop(&dc->disk); |
cafe5635 KO |
1184 | } |
1185 | ||
1186 | /* Flash only volumes */ | |
1187 | ||
1188 | void bch_flash_dev_release(struct kobject *kobj) | |
1189 | { | |
1190 | struct bcache_device *d = container_of(kobj, struct bcache_device, | |
1191 | kobj); | |
1192 | kfree(d); | |
1193 | } | |
1194 | ||
1195 | static void flash_dev_free(struct closure *cl) | |
1196 | { | |
1197 | struct bcache_device *d = container_of(cl, struct bcache_device, cl); | |
e5112201 | 1198 | mutex_lock(&bch_register_lock); |
cafe5635 | 1199 | bcache_device_free(d); |
e5112201 | 1200 | mutex_unlock(&bch_register_lock); |
cafe5635 KO |
1201 | kobject_put(&d->kobj); |
1202 | } | |
1203 | ||
1204 | static void flash_dev_flush(struct closure *cl) | |
1205 | { | |
1206 | struct bcache_device *d = container_of(cl, struct bcache_device, cl); | |
1207 | ||
e5112201 | 1208 | mutex_lock(&bch_register_lock); |
ee668506 | 1209 | bcache_device_unlink(d); |
e5112201 | 1210 | mutex_unlock(&bch_register_lock); |
cafe5635 KO |
1211 | kobject_del(&d->kobj); |
1212 | continue_at(cl, flash_dev_free, system_wq); | |
1213 | } | |
1214 | ||
1215 | static int flash_dev_run(struct cache_set *c, struct uuid_entry *u) | |
1216 | { | |
1217 | struct bcache_device *d = kzalloc(sizeof(struct bcache_device), | |
1218 | GFP_KERNEL); | |
1219 | if (!d) | |
1220 | return -ENOMEM; | |
1221 | ||
1222 | closure_init(&d->cl, NULL); | |
1223 | set_closure_fn(&d->cl, flash_dev_flush, system_wq); | |
1224 | ||
1225 | kobject_init(&d->kobj, &bch_flash_dev_ktype); | |
1226 | ||
279afbad | 1227 | if (bcache_device_init(d, block_bytes(c), u->sectors)) |
cafe5635 KO |
1228 | goto err; |
1229 | ||
1230 | bcache_device_attach(d, c, u - c->uuids); | |
cafe5635 KO |
1231 | bch_flash_dev_request_init(d); |
1232 | add_disk(d->disk); | |
1233 | ||
1234 | if (kobject_add(&d->kobj, &disk_to_dev(d->disk)->kobj, "bcache")) | |
1235 | goto err; | |
1236 | ||
1237 | bcache_device_link(d, c, "volume"); | |
1238 | ||
1239 | return 0; | |
1240 | err: | |
1241 | kobject_put(&d->kobj); | |
1242 | return -ENOMEM; | |
1243 | } | |
1244 | ||
1245 | static int flash_devs_run(struct cache_set *c) | |
1246 | { | |
1247 | int ret = 0; | |
1248 | struct uuid_entry *u; | |
1249 | ||
1250 | for (u = c->uuids; | |
1251 | u < c->uuids + c->nr_uuids && !ret; | |
1252 | u++) | |
1253 | if (UUID_FLASH_ONLY(u)) | |
1254 | ret = flash_dev_run(c, u); | |
1255 | ||
1256 | return ret; | |
1257 | } | |
1258 | ||
1259 | int bch_flash_dev_create(struct cache_set *c, uint64_t size) | |
1260 | { | |
1261 | struct uuid_entry *u; | |
1262 | ||
1263 | if (test_bit(CACHE_SET_STOPPING, &c->flags)) | |
1264 | return -EINTR; | |
1265 | ||
bf0c55c9 SP |
1266 | if (!test_bit(CACHE_SET_RUNNING, &c->flags)) |
1267 | return -EPERM; | |
1268 | ||
cafe5635 KO |
1269 | u = uuid_find_empty(c); |
1270 | if (!u) { | |
1271 | pr_err("Can't create volume, no room for UUID"); | |
1272 | return -EINVAL; | |
1273 | } | |
1274 | ||
1275 | get_random_bytes(u->uuid, 16); | |
1276 | memset(u->label, 0, 32); | |
1277 | u->first_reg = u->last_reg = cpu_to_le32(get_seconds()); | |
1278 | ||
1279 | SET_UUID_FLASH_ONLY(u, 1); | |
1280 | u->sectors = size >> 9; | |
1281 | ||
1282 | bch_uuid_write(c); | |
1283 | ||
1284 | return flash_dev_run(c, u); | |
1285 | } | |
1286 | ||
1287 | /* Cache set */ | |
1288 | ||
1289 | __printf(2, 3) | |
1290 | bool bch_cache_set_error(struct cache_set *c, const char *fmt, ...) | |
1291 | { | |
1292 | va_list args; | |
1293 | ||
77c320eb KO |
1294 | if (c->on_error != ON_ERROR_PANIC && |
1295 | test_bit(CACHE_SET_STOPPING, &c->flags)) | |
cafe5635 KO |
1296 | return false; |
1297 | ||
1298 | /* XXX: we can be called from atomic context | |
1299 | acquire_console_sem(); | |
1300 | */ | |
1301 | ||
1302 | printk(KERN_ERR "bcache: error on %pU: ", c->sb.set_uuid); | |
1303 | ||
1304 | va_start(args, fmt); | |
1305 | vprintk(fmt, args); | |
1306 | va_end(args); | |
1307 | ||
1308 | printk(", disabling caching\n"); | |
1309 | ||
77c320eb KO |
1310 | if (c->on_error == ON_ERROR_PANIC) |
1311 | panic("panic forced after error\n"); | |
1312 | ||
cafe5635 KO |
1313 | bch_cache_set_unregister(c); |
1314 | return true; | |
1315 | } | |
1316 | ||
1317 | void bch_cache_set_release(struct kobject *kobj) | |
1318 | { | |
1319 | struct cache_set *c = container_of(kobj, struct cache_set, kobj); | |
1320 | kfree(c); | |
1321 | module_put(THIS_MODULE); | |
1322 | } | |
1323 | ||
1324 | static void cache_set_free(struct closure *cl) | |
1325 | { | |
1326 | struct cache_set *c = container_of(cl, struct cache_set, cl); | |
1327 | struct cache *ca; | |
1328 | unsigned i; | |
1329 | ||
1330 | if (!IS_ERR_OR_NULL(c->debug)) | |
1331 | debugfs_remove(c->debug); | |
1332 | ||
1333 | bch_open_buckets_free(c); | |
1334 | bch_btree_cache_free(c); | |
1335 | bch_journal_free(c); | |
1336 | ||
1337 | for_each_cache(ca, c, i) | |
c9a78332 SP |
1338 | if (ca) { |
1339 | ca->set = NULL; | |
1340 | c->cache[ca->sb.nr_this_dev] = NULL; | |
cafe5635 | 1341 | kobject_put(&ca->kobj); |
c9a78332 | 1342 | } |
cafe5635 | 1343 | |
67539e85 | 1344 | bch_bset_sort_state_free(&c->sort); |
cafe5635 | 1345 | free_pages((unsigned long) c->uuids, ilog2(bucket_pages(c))); |
cafe5635 | 1346 | |
da415a09 NS |
1347 | if (c->moving_gc_wq) |
1348 | destroy_workqueue(c->moving_gc_wq); | |
cafe5635 KO |
1349 | if (c->bio_split) |
1350 | bioset_free(c->bio_split); | |
57943511 KO |
1351 | if (c->fill_iter) |
1352 | mempool_destroy(c->fill_iter); | |
cafe5635 KO |
1353 | if (c->bio_meta) |
1354 | mempool_destroy(c->bio_meta); | |
1355 | if (c->search) | |
1356 | mempool_destroy(c->search); | |
1357 | kfree(c->devices); | |
1358 | ||
1359 | mutex_lock(&bch_register_lock); | |
1360 | list_del(&c->list); | |
1361 | mutex_unlock(&bch_register_lock); | |
1362 | ||
1363 | pr_info("Cache set %pU unregistered", c->sb.set_uuid); | |
1364 | wake_up(&unregister_wait); | |
1365 | ||
1366 | closure_debug_destroy(&c->cl); | |
1367 | kobject_put(&c->kobj); | |
1368 | } | |
1369 | ||
1370 | static void cache_set_flush(struct closure *cl) | |
1371 | { | |
1372 | struct cache_set *c = container_of(cl, struct cache_set, caching); | |
79826c35 | 1373 | struct cache *ca; |
cafe5635 | 1374 | struct btree *b; |
79826c35 | 1375 | unsigned i; |
cafe5635 | 1376 | |
f8b11260 EW |
1377 | if (!c) |
1378 | closure_return(cl); | |
1379 | ||
cafe5635 KO |
1380 | bch_cache_accounting_destroy(&c->accounting); |
1381 | ||
1382 | kobject_put(&c->internal); | |
1383 | kobject_del(&c->kobj); | |
1384 | ||
72a44517 KO |
1385 | if (c->gc_thread) |
1386 | kthread_stop(c->gc_thread); | |
1387 | ||
cafe5635 KO |
1388 | if (!IS_ERR_OR_NULL(c->root)) |
1389 | list_add(&c->root->list, &c->btree_cache); | |
1390 | ||
1391 | /* Should skip this if we're unregistering because of an error */ | |
2a285686 KO |
1392 | list_for_each_entry(b, &c->btree_cache, list) { |
1393 | mutex_lock(&b->write_lock); | |
cafe5635 | 1394 | if (btree_node_dirty(b)) |
2a285686 KO |
1395 | __bch_btree_node_write(b, NULL); |
1396 | mutex_unlock(&b->write_lock); | |
1397 | } | |
cafe5635 | 1398 | |
79826c35 KO |
1399 | for_each_cache(ca, c, i) |
1400 | if (ca->alloc_thread) | |
1401 | kthread_stop(ca->alloc_thread); | |
1402 | ||
5b1016e6 KO |
1403 | if (c->journal.cur) { |
1404 | cancel_delayed_work_sync(&c->journal.work); | |
1405 | /* flush last journal entry if needed */ | |
1406 | c->journal.work.work.func(&c->journal.work.work); | |
1407 | } | |
dabb4433 | 1408 | |
cafe5635 KO |
1409 | closure_return(cl); |
1410 | } | |
1411 | ||
1412 | static void __cache_set_unregister(struct closure *cl) | |
1413 | { | |
1414 | struct cache_set *c = container_of(cl, struct cache_set, caching); | |
5caa52af | 1415 | struct cached_dev *dc; |
cafe5635 KO |
1416 | size_t i; |
1417 | ||
1418 | mutex_lock(&bch_register_lock); | |
1419 | ||
cafe5635 | 1420 | for (i = 0; i < c->nr_uuids; i++) |
5caa52af KO |
1421 | if (c->devices[i]) { |
1422 | if (!UUID_FLASH_ONLY(&c->uuids[i]) && | |
1423 | test_bit(CACHE_SET_UNREGISTERING, &c->flags)) { | |
1424 | dc = container_of(c->devices[i], | |
1425 | struct cached_dev, disk); | |
1426 | bch_cached_dev_detach(dc); | |
1427 | } else { | |
1428 | bcache_device_stop(c->devices[i]); | |
1429 | } | |
1430 | } | |
cafe5635 KO |
1431 | |
1432 | mutex_unlock(&bch_register_lock); | |
1433 | ||
1434 | continue_at(cl, cache_set_flush, system_wq); | |
1435 | } | |
1436 | ||
1437 | void bch_cache_set_stop(struct cache_set *c) | |
1438 | { | |
1439 | if (!test_and_set_bit(CACHE_SET_STOPPING, &c->flags)) | |
1440 | closure_queue(&c->caching); | |
1441 | } | |
1442 | ||
1443 | void bch_cache_set_unregister(struct cache_set *c) | |
1444 | { | |
1445 | set_bit(CACHE_SET_UNREGISTERING, &c->flags); | |
1446 | bch_cache_set_stop(c); | |
1447 | } | |
1448 | ||
1449 | #define alloc_bucket_pages(gfp, c) \ | |
1450 | ((void *) __get_free_pages(__GFP_ZERO|gfp, ilog2(bucket_pages(c)))) | |
1451 | ||
1452 | struct cache_set *bch_cache_set_alloc(struct cache_sb *sb) | |
1453 | { | |
1454 | int iter_size; | |
1455 | struct cache_set *c = kzalloc(sizeof(struct cache_set), GFP_KERNEL); | |
1456 | if (!c) | |
1457 | return NULL; | |
1458 | ||
1459 | __module_get(THIS_MODULE); | |
1460 | closure_init(&c->cl, NULL); | |
1461 | set_closure_fn(&c->cl, cache_set_free, system_wq); | |
1462 | ||
1463 | closure_init(&c->caching, &c->cl); | |
1464 | set_closure_fn(&c->caching, __cache_set_unregister, system_wq); | |
1465 | ||
1466 | /* Maybe create continue_at_noreturn() and use it here? */ | |
1467 | closure_set_stopped(&c->cl); | |
1468 | closure_put(&c->cl); | |
1469 | ||
1470 | kobject_init(&c->kobj, &bch_cache_set_ktype); | |
1471 | kobject_init(&c->internal, &bch_cache_set_internal_ktype); | |
1472 | ||
1473 | bch_cache_accounting_init(&c->accounting, &c->cl); | |
1474 | ||
1475 | memcpy(c->sb.set_uuid, sb->set_uuid, 16); | |
1476 | c->sb.block_size = sb->block_size; | |
1477 | c->sb.bucket_size = sb->bucket_size; | |
1478 | c->sb.nr_in_set = sb->nr_in_set; | |
1479 | c->sb.last_mount = sb->last_mount; | |
1480 | c->bucket_bits = ilog2(sb->bucket_size); | |
1481 | c->block_bits = ilog2(sb->block_size); | |
1482 | c->nr_uuids = bucket_bytes(c) / sizeof(struct uuid_entry); | |
1483 | ||
ee811287 | 1484 | c->btree_pages = bucket_pages(c); |
cafe5635 KO |
1485 | if (c->btree_pages > BTREE_MAX_PAGES) |
1486 | c->btree_pages = max_t(int, c->btree_pages / 4, | |
1487 | BTREE_MAX_PAGES); | |
1488 | ||
cb7a583e | 1489 | sema_init(&c->sb_write_mutex, 1); |
e8e1d468 | 1490 | mutex_init(&c->bucket_lock); |
0a63b66d | 1491 | init_waitqueue_head(&c->btree_cache_wait); |
35fcd848 | 1492 | init_waitqueue_head(&c->bucket_wait); |
cb7a583e | 1493 | sema_init(&c->uuid_write_mutex, 1); |
65d22e91 | 1494 | |
65d22e91 KO |
1495 | spin_lock_init(&c->btree_gc_time.lock); |
1496 | spin_lock_init(&c->btree_split_time.lock); | |
1497 | spin_lock_init(&c->btree_read_time.lock); | |
e8e1d468 | 1498 | |
cafe5635 KO |
1499 | bch_moving_init_cache_set(c); |
1500 | ||
1501 | INIT_LIST_HEAD(&c->list); | |
1502 | INIT_LIST_HEAD(&c->cached_devs); | |
1503 | INIT_LIST_HEAD(&c->btree_cache); | |
1504 | INIT_LIST_HEAD(&c->btree_cache_freeable); | |
1505 | INIT_LIST_HEAD(&c->btree_cache_freed); | |
1506 | INIT_LIST_HEAD(&c->data_buckets); | |
1507 | ||
1508 | c->search = mempool_create_slab_pool(32, bch_search_cache); | |
1509 | if (!c->search) | |
1510 | goto err; | |
1511 | ||
1512 | iter_size = (sb->bucket_size / sb->block_size + 1) * | |
1513 | sizeof(struct btree_iter_set); | |
1514 | ||
1515 | if (!(c->devices = kzalloc(c->nr_uuids * sizeof(void *), GFP_KERNEL)) || | |
1516 | !(c->bio_meta = mempool_create_kmalloc_pool(2, | |
1517 | sizeof(struct bbio) + sizeof(struct bio_vec) * | |
1518 | bucket_pages(c))) || | |
57943511 | 1519 | !(c->fill_iter = mempool_create_kmalloc_pool(1, iter_size)) || |
cafe5635 | 1520 | !(c->bio_split = bioset_create(4, offsetof(struct bbio, bio))) || |
cafe5635 | 1521 | !(c->uuids = alloc_bucket_pages(GFP_KERNEL, c)) || |
81baf90a BS |
1522 | !(c->moving_gc_wq = alloc_workqueue("bcache_gc", |
1523 | WQ_MEM_RECLAIM, 0)) || | |
cafe5635 KO |
1524 | bch_journal_alloc(c) || |
1525 | bch_btree_cache_alloc(c) || | |
67539e85 KO |
1526 | bch_open_buckets_alloc(c) || |
1527 | bch_bset_sort_state_init(&c->sort, ilog2(c->btree_pages))) | |
cafe5635 KO |
1528 | goto err; |
1529 | ||
cafe5635 KO |
1530 | c->congested_read_threshold_us = 2000; |
1531 | c->congested_write_threshold_us = 20000; | |
1532 | c->error_limit = 8 << IO_ERROR_SHIFT; | |
1533 | ||
1534 | return c; | |
1535 | err: | |
1536 | bch_cache_set_unregister(c); | |
1537 | return NULL; | |
1538 | } | |
1539 | ||
1540 | static void run_cache_set(struct cache_set *c) | |
1541 | { | |
1542 | const char *err = "cannot allocate memory"; | |
1543 | struct cached_dev *dc, *t; | |
1544 | struct cache *ca; | |
c18536a7 | 1545 | struct closure cl; |
cafe5635 KO |
1546 | unsigned i; |
1547 | ||
c18536a7 | 1548 | closure_init_stack(&cl); |
cafe5635 KO |
1549 | |
1550 | for_each_cache(ca, c, i) | |
1551 | c->nbuckets += ca->sb.nbuckets; | |
1552 | ||
1553 | if (CACHE_SYNC(&c->sb)) { | |
1554 | LIST_HEAD(journal); | |
1555 | struct bkey *k; | |
1556 | struct jset *j; | |
1557 | ||
1558 | err = "cannot allocate memory for journal"; | |
c18536a7 | 1559 | if (bch_journal_read(c, &journal)) |
cafe5635 KO |
1560 | goto err; |
1561 | ||
1562 | pr_debug("btree_journal_read() done"); | |
1563 | ||
1564 | err = "no journal entries found"; | |
1565 | if (list_empty(&journal)) | |
1566 | goto err; | |
1567 | ||
1568 | j = &list_entry(journal.prev, struct journal_replay, list)->j; | |
1569 | ||
1570 | err = "IO error reading priorities"; | |
1571 | for_each_cache(ca, c, i) | |
1572 | prio_read(ca, j->prio_bucket[ca->sb.nr_this_dev]); | |
1573 | ||
1574 | /* | |
1575 | * If prio_read() fails it'll call cache_set_error and we'll | |
1576 | * tear everything down right away, but if we perhaps checked | |
1577 | * sooner we could avoid journal replay. | |
1578 | */ | |
1579 | ||
1580 | k = &j->btree_root; | |
1581 | ||
1582 | err = "bad btree root"; | |
65d45231 | 1583 | if (__bch_btree_ptr_invalid(c, k)) |
cafe5635 KO |
1584 | goto err; |
1585 | ||
1586 | err = "error reading btree root"; | |
2452cc89 | 1587 | c->root = bch_btree_node_get(c, NULL, k, j->btree_level, true, NULL); |
cafe5635 KO |
1588 | if (IS_ERR_OR_NULL(c->root)) |
1589 | goto err; | |
1590 | ||
1591 | list_del_init(&c->root->list); | |
1592 | rw_unlock(true, c->root); | |
1593 | ||
c18536a7 | 1594 | err = uuid_read(c, j, &cl); |
cafe5635 KO |
1595 | if (err) |
1596 | goto err; | |
1597 | ||
1598 | err = "error in recovery"; | |
c18536a7 | 1599 | if (bch_btree_check(c)) |
cafe5635 KO |
1600 | goto err; |
1601 | ||
1602 | bch_journal_mark(c, &journal); | |
2531d9ee | 1603 | bch_initial_gc_finish(c); |
cafe5635 KO |
1604 | pr_debug("btree_check() done"); |
1605 | ||
1606 | /* | |
1607 | * bcache_journal_next() can't happen sooner, or | |
1608 | * btree_gc_finish() will give spurious errors about last_gc > | |
1609 | * gc_gen - this is a hack but oh well. | |
1610 | */ | |
1611 | bch_journal_next(&c->journal); | |
1612 | ||
119ba0f8 | 1613 | err = "error starting allocator thread"; |
cafe5635 | 1614 | for_each_cache(ca, c, i) |
119ba0f8 KO |
1615 | if (bch_cache_allocator_start(ca)) |
1616 | goto err; | |
cafe5635 KO |
1617 | |
1618 | /* | |
1619 | * First place it's safe to allocate: btree_check() and | |
1620 | * btree_gc_finish() have to run before we have buckets to | |
1621 | * allocate, and bch_bucket_alloc_set() might cause a journal | |
1622 | * entry to be written so bcache_journal_next() has to be called | |
1623 | * first. | |
1624 | * | |
1625 | * If the uuids were in the old format we have to rewrite them | |
1626 | * before the next journal entry is written: | |
1627 | */ | |
1628 | if (j->version < BCACHE_JSET_VERSION_UUID) | |
1629 | __uuid_write(c); | |
1630 | ||
c18536a7 | 1631 | bch_journal_replay(c, &journal); |
cafe5635 KO |
1632 | } else { |
1633 | pr_notice("invalidating existing data"); | |
cafe5635 KO |
1634 | |
1635 | for_each_cache(ca, c, i) { | |
1636 | unsigned j; | |
1637 | ||
1638 | ca->sb.keys = clamp_t(int, ca->sb.nbuckets >> 7, | |
1639 | 2, SB_JOURNAL_BUCKETS); | |
1640 | ||
1641 | for (j = 0; j < ca->sb.keys; j++) | |
1642 | ca->sb.d[j] = ca->sb.first_bucket + j; | |
1643 | } | |
1644 | ||
2531d9ee | 1645 | bch_initial_gc_finish(c); |
cafe5635 | 1646 | |
119ba0f8 | 1647 | err = "error starting allocator thread"; |
cafe5635 | 1648 | for_each_cache(ca, c, i) |
119ba0f8 KO |
1649 | if (bch_cache_allocator_start(ca)) |
1650 | goto err; | |
cafe5635 KO |
1651 | |
1652 | mutex_lock(&c->bucket_lock); | |
1653 | for_each_cache(ca, c, i) | |
1654 | bch_prio_write(ca); | |
1655 | mutex_unlock(&c->bucket_lock); | |
1656 | ||
cafe5635 KO |
1657 | err = "cannot allocate new UUID bucket"; |
1658 | if (__uuid_write(c)) | |
72a44517 | 1659 | goto err; |
cafe5635 KO |
1660 | |
1661 | err = "cannot allocate new btree root"; | |
2452cc89 | 1662 | c->root = __bch_btree_node_alloc(c, NULL, 0, true, NULL); |
cafe5635 | 1663 | if (IS_ERR_OR_NULL(c->root)) |
72a44517 | 1664 | goto err; |
cafe5635 | 1665 | |
2a285686 | 1666 | mutex_lock(&c->root->write_lock); |
cafe5635 | 1667 | bkey_copy_key(&c->root->key, &MAX_KEY); |
c18536a7 | 1668 | bch_btree_node_write(c->root, &cl); |
2a285686 | 1669 | mutex_unlock(&c->root->write_lock); |
cafe5635 KO |
1670 | |
1671 | bch_btree_set_root(c->root); | |
1672 | rw_unlock(true, c->root); | |
1673 | ||
1674 | /* | |
1675 | * We don't want to write the first journal entry until | |
1676 | * everything is set up - fortunately journal entries won't be | |
1677 | * written until the SET_CACHE_SYNC() here: | |
1678 | */ | |
1679 | SET_CACHE_SYNC(&c->sb, true); | |
1680 | ||
1681 | bch_journal_next(&c->journal); | |
c18536a7 | 1682 | bch_journal_meta(c, &cl); |
cafe5635 KO |
1683 | } |
1684 | ||
72a44517 KO |
1685 | err = "error starting gc thread"; |
1686 | if (bch_gc_thread_start(c)) | |
1687 | goto err; | |
1688 | ||
c18536a7 | 1689 | closure_sync(&cl); |
cafe5635 KO |
1690 | c->sb.last_mount = get_seconds(); |
1691 | bcache_write_super(c); | |
1692 | ||
1693 | list_for_each_entry_safe(dc, t, &uncached_devices, list) | |
1694 | bch_cached_dev_attach(dc, c); | |
1695 | ||
1696 | flash_devs_run(c); | |
1697 | ||
bf0c55c9 | 1698 | set_bit(CACHE_SET_RUNNING, &c->flags); |
cafe5635 | 1699 | return; |
cafe5635 | 1700 | err: |
c18536a7 | 1701 | closure_sync(&cl); |
cafe5635 | 1702 | /* XXX: test this, it's broken */ |
c8694948 | 1703 | bch_cache_set_error(c, "%s", err); |
cafe5635 KO |
1704 | } |
1705 | ||
1706 | static bool can_attach_cache(struct cache *ca, struct cache_set *c) | |
1707 | { | |
1708 | return ca->sb.block_size == c->sb.block_size && | |
9eb8ebeb | 1709 | ca->sb.bucket_size == c->sb.bucket_size && |
cafe5635 KO |
1710 | ca->sb.nr_in_set == c->sb.nr_in_set; |
1711 | } | |
1712 | ||
1713 | static const char *register_cache_set(struct cache *ca) | |
1714 | { | |
1715 | char buf[12]; | |
1716 | const char *err = "cannot allocate memory"; | |
1717 | struct cache_set *c; | |
1718 | ||
1719 | list_for_each_entry(c, &bch_cache_sets, list) | |
1720 | if (!memcmp(c->sb.set_uuid, ca->sb.set_uuid, 16)) { | |
1721 | if (c->cache[ca->sb.nr_this_dev]) | |
1722 | return "duplicate cache set member"; | |
1723 | ||
1724 | if (!can_attach_cache(ca, c)) | |
1725 | return "cache sb does not match set"; | |
1726 | ||
1727 | if (!CACHE_SYNC(&ca->sb)) | |
1728 | SET_CACHE_SYNC(&c->sb, false); | |
1729 | ||
1730 | goto found; | |
1731 | } | |
1732 | ||
1733 | c = bch_cache_set_alloc(&ca->sb); | |
1734 | if (!c) | |
1735 | return err; | |
1736 | ||
1737 | err = "error creating kobject"; | |
1738 | if (kobject_add(&c->kobj, bcache_kobj, "%pU", c->sb.set_uuid) || | |
1739 | kobject_add(&c->internal, &c->kobj, "internal")) | |
1740 | goto err; | |
1741 | ||
1742 | if (bch_cache_accounting_add_kobjs(&c->accounting, &c->kobj)) | |
1743 | goto err; | |
1744 | ||
1745 | bch_debug_init_cache_set(c); | |
1746 | ||
1747 | list_add(&c->list, &bch_cache_sets); | |
1748 | found: | |
1749 | sprintf(buf, "cache%i", ca->sb.nr_this_dev); | |
1750 | if (sysfs_create_link(&ca->kobj, &c->kobj, "set") || | |
1751 | sysfs_create_link(&c->kobj, &ca->kobj, buf)) | |
1752 | goto err; | |
1753 | ||
1754 | if (ca->sb.seq > c->sb.seq) { | |
1755 | c->sb.version = ca->sb.version; | |
1756 | memcpy(c->sb.set_uuid, ca->sb.set_uuid, 16); | |
1757 | c->sb.flags = ca->sb.flags; | |
1758 | c->sb.seq = ca->sb.seq; | |
1759 | pr_debug("set version = %llu", c->sb.version); | |
1760 | } | |
1761 | ||
d83353b3 | 1762 | kobject_get(&ca->kobj); |
cafe5635 KO |
1763 | ca->set = c; |
1764 | ca->set->cache[ca->sb.nr_this_dev] = ca; | |
1765 | c->cache_by_alloc[c->caches_loaded++] = ca; | |
1766 | ||
1767 | if (c->caches_loaded == c->sb.nr_in_set) | |
1768 | run_cache_set(c); | |
1769 | ||
1770 | return NULL; | |
1771 | err: | |
1772 | bch_cache_set_unregister(c); | |
1773 | return err; | |
1774 | } | |
1775 | ||
1776 | /* Cache device */ | |
1777 | ||
1778 | void bch_cache_release(struct kobject *kobj) | |
1779 | { | |
1780 | struct cache *ca = container_of(kobj, struct cache, kobj); | |
78365411 | 1781 | unsigned i; |
cafe5635 | 1782 | |
c9a78332 SP |
1783 | if (ca->set) { |
1784 | BUG_ON(ca->set->cache[ca->sb.nr_this_dev] != ca); | |
cafe5635 | 1785 | ca->set->cache[ca->sb.nr_this_dev] = NULL; |
c9a78332 | 1786 | } |
cafe5635 | 1787 | |
cafe5635 KO |
1788 | free_pages((unsigned long) ca->disk_buckets, ilog2(bucket_pages(ca))); |
1789 | kfree(ca->prio_buckets); | |
1790 | vfree(ca->buckets); | |
1791 | ||
1792 | free_heap(&ca->heap); | |
cafe5635 | 1793 | free_fifo(&ca->free_inc); |
78365411 KO |
1794 | |
1795 | for (i = 0; i < RESERVE_NR; i++) | |
1796 | free_fifo(&ca->free[i]); | |
cafe5635 KO |
1797 | |
1798 | if (ca->sb_bio.bi_inline_vecs[0].bv_page) | |
1799 | put_page(ca->sb_bio.bi_io_vec[0].bv_page); | |
1800 | ||
0781c874 | 1801 | if (!IS_ERR_OR_NULL(ca->bdev)) |
cafe5635 | 1802 | blkdev_put(ca->bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL); |
cafe5635 KO |
1803 | |
1804 | kfree(ca); | |
1805 | module_put(THIS_MODULE); | |
1806 | } | |
1807 | ||
c50d4d5d | 1808 | static int cache_alloc(struct cache *ca) |
cafe5635 KO |
1809 | { |
1810 | size_t free; | |
1811 | struct bucket *b; | |
1812 | ||
cafe5635 KO |
1813 | __module_get(THIS_MODULE); |
1814 | kobject_init(&ca->kobj, &bch_cache_ktype); | |
1815 | ||
cafe5635 KO |
1816 | bio_init(&ca->journal.bio); |
1817 | ca->journal.bio.bi_max_vecs = 8; | |
1818 | ca->journal.bio.bi_io_vec = ca->journal.bio.bi_inline_vecs; | |
1819 | ||
78365411 | 1820 | free = roundup_pow_of_two(ca->sb.nbuckets) >> 10; |
cafe5635 | 1821 | |
78365411 KO |
1822 | if (!init_fifo(&ca->free[RESERVE_BTREE], 8, GFP_KERNEL) || |
1823 | !init_fifo(&ca->free[RESERVE_PRIO], prio_buckets(ca), GFP_KERNEL) || | |
1824 | !init_fifo(&ca->free[RESERVE_MOVINGGC], free, GFP_KERNEL) || | |
1825 | !init_fifo(&ca->free[RESERVE_NONE], free, GFP_KERNEL) || | |
cafe5635 | 1826 | !init_fifo(&ca->free_inc, free << 2, GFP_KERNEL) || |
cafe5635 | 1827 | !init_heap(&ca->heap, free << 3, GFP_KERNEL) || |
f59fce84 | 1828 | !(ca->buckets = vzalloc(sizeof(struct bucket) * |
cafe5635 KO |
1829 | ca->sb.nbuckets)) || |
1830 | !(ca->prio_buckets = kzalloc(sizeof(uint64_t) * prio_buckets(ca) * | |
1831 | 2, GFP_KERNEL)) || | |
749b61da | 1832 | !(ca->disk_buckets = alloc_bucket_pages(GFP_KERNEL, ca))) |
f59fce84 | 1833 | return -ENOMEM; |
cafe5635 KO |
1834 | |
1835 | ca->prio_last_buckets = ca->prio_buckets + prio_buckets(ca); | |
1836 | ||
cafe5635 KO |
1837 | for_each_bucket(b, ca) |
1838 | atomic_set(&b->pin, 0); | |
1839 | ||
cafe5635 | 1840 | return 0; |
cafe5635 KO |
1841 | } |
1842 | ||
9b299728 | 1843 | static int register_cache(struct cache_sb *sb, struct page *sb_page, |
c9a78332 | 1844 | struct block_device *bdev, struct cache *ca) |
cafe5635 KO |
1845 | { |
1846 | char name[BDEVNAME_SIZE]; | |
9b299728 EW |
1847 | const char *err = NULL; |
1848 | int ret = 0; | |
cafe5635 | 1849 | |
f59fce84 | 1850 | memcpy(&ca->sb, sb, sizeof(struct cache_sb)); |
cafe5635 KO |
1851 | ca->bdev = bdev; |
1852 | ca->bdev->bd_holder = ca; | |
1853 | ||
f59fce84 KO |
1854 | bio_init(&ca->sb_bio); |
1855 | ca->sb_bio.bi_max_vecs = 1; | |
1856 | ca->sb_bio.bi_io_vec = ca->sb_bio.bi_inline_vecs; | |
1857 | ca->sb_bio.bi_io_vec[0].bv_page = sb_page; | |
1858 | get_page(sb_page); | |
1859 | ||
cafe5635 KO |
1860 | if (blk_queue_discard(bdev_get_queue(ca->bdev))) |
1861 | ca->discard = CACHE_DISCARD(&ca->sb); | |
1862 | ||
c50d4d5d | 1863 | ret = cache_alloc(ca); |
9b299728 | 1864 | if (ret != 0) |
f59fce84 KO |
1865 | goto err; |
1866 | ||
9b299728 EW |
1867 | if (kobject_add(&ca->kobj, &part_to_dev(bdev->bd_part)->kobj, "bcache")) { |
1868 | err = "error calling kobject_add"; | |
1869 | ret = -ENOMEM; | |
1870 | goto out; | |
1871 | } | |
cafe5635 | 1872 | |
4fa03402 | 1873 | mutex_lock(&bch_register_lock); |
cafe5635 | 1874 | err = register_cache_set(ca); |
4fa03402 KO |
1875 | mutex_unlock(&bch_register_lock); |
1876 | ||
9b299728 EW |
1877 | if (err) { |
1878 | ret = -ENODEV; | |
1879 | goto out; | |
1880 | } | |
cafe5635 KO |
1881 | |
1882 | pr_info("registered cache device %s", bdevname(bdev, name)); | |
9b299728 | 1883 | |
d83353b3 KO |
1884 | out: |
1885 | kobject_put(&ca->kobj); | |
9b299728 | 1886 | |
cafe5635 | 1887 | err: |
9b299728 EW |
1888 | if (err) |
1889 | pr_notice("error opening %s: %s", bdevname(bdev, name), err); | |
1890 | ||
1891 | return ret; | |
cafe5635 KO |
1892 | } |
1893 | ||
1894 | /* Global interfaces/init */ | |
1895 | ||
1896 | static ssize_t register_bcache(struct kobject *, struct kobj_attribute *, | |
1897 | const char *, size_t); | |
1898 | ||
1899 | kobj_attribute_write(register, register_bcache); | |
1900 | kobj_attribute_write(register_quiet, register_bcache); | |
1901 | ||
a9dd53ad GP |
1902 | static bool bch_is_open_backing(struct block_device *bdev) { |
1903 | struct cache_set *c, *tc; | |
1904 | struct cached_dev *dc, *t; | |
1905 | ||
1906 | list_for_each_entry_safe(c, tc, &bch_cache_sets, list) | |
1907 | list_for_each_entry_safe(dc, t, &c->cached_devs, list) | |
1908 | if (dc->bdev == bdev) | |
1909 | return true; | |
1910 | list_for_each_entry_safe(dc, t, &uncached_devices, list) | |
1911 | if (dc->bdev == bdev) | |
1912 | return true; | |
1913 | return false; | |
1914 | } | |
1915 | ||
1916 | static bool bch_is_open_cache(struct block_device *bdev) { | |
1917 | struct cache_set *c, *tc; | |
1918 | struct cache *ca; | |
1919 | unsigned i; | |
1920 | ||
1921 | list_for_each_entry_safe(c, tc, &bch_cache_sets, list) | |
1922 | for_each_cache(ca, c, i) | |
1923 | if (ca->bdev == bdev) | |
1924 | return true; | |
1925 | return false; | |
1926 | } | |
1927 | ||
1928 | static bool bch_is_open(struct block_device *bdev) { | |
1929 | return bch_is_open_cache(bdev) || bch_is_open_backing(bdev); | |
1930 | } | |
1931 | ||
cafe5635 KO |
1932 | static ssize_t register_bcache(struct kobject *k, struct kobj_attribute *attr, |
1933 | const char *buffer, size_t size) | |
1934 | { | |
1935 | ssize_t ret = size; | |
1936 | const char *err = "cannot allocate memory"; | |
1937 | char *path = NULL; | |
1938 | struct cache_sb *sb = NULL; | |
1939 | struct block_device *bdev = NULL; | |
1940 | struct page *sb_page = NULL; | |
1941 | ||
1942 | if (!try_module_get(THIS_MODULE)) | |
1943 | return -EBUSY; | |
1944 | ||
cafe5635 KO |
1945 | if (!(path = kstrndup(buffer, size, GFP_KERNEL)) || |
1946 | !(sb = kmalloc(sizeof(struct cache_sb), GFP_KERNEL))) | |
1947 | goto err; | |
1948 | ||
1949 | err = "failed to open device"; | |
1950 | bdev = blkdev_get_by_path(strim(path), | |
1951 | FMODE_READ|FMODE_WRITE|FMODE_EXCL, | |
1952 | sb); | |
f59fce84 | 1953 | if (IS_ERR(bdev)) { |
a9dd53ad GP |
1954 | if (bdev == ERR_PTR(-EBUSY)) { |
1955 | bdev = lookup_bdev(strim(path)); | |
789d21db | 1956 | mutex_lock(&bch_register_lock); |
a9dd53ad GP |
1957 | if (!IS_ERR(bdev) && bch_is_open(bdev)) |
1958 | err = "device already registered"; | |
1959 | else | |
1960 | err = "device busy"; | |
789d21db | 1961 | mutex_unlock(&bch_register_lock); |
d7076f21 GP |
1962 | if (attr == &ksysfs_register_quiet) |
1963 | goto out; | |
a9dd53ad | 1964 | } |
cafe5635 | 1965 | goto err; |
f59fce84 KO |
1966 | } |
1967 | ||
1968 | err = "failed to set blocksize"; | |
1969 | if (set_blocksize(bdev, 4096)) | |
1970 | goto err_close; | |
cafe5635 KO |
1971 | |
1972 | err = read_super(sb, bdev, &sb_page); | |
1973 | if (err) | |
1974 | goto err_close; | |
1975 | ||
2903381f | 1976 | if (SB_IS_BDEV(sb)) { |
cafe5635 | 1977 | struct cached_dev *dc = kzalloc(sizeof(*dc), GFP_KERNEL); |
f59fce84 KO |
1978 | if (!dc) |
1979 | goto err_close; | |
cafe5635 | 1980 | |
4fa03402 | 1981 | mutex_lock(&bch_register_lock); |
f59fce84 | 1982 | register_bdev(sb, sb_page, bdev, dc); |
4fa03402 | 1983 | mutex_unlock(&bch_register_lock); |
cafe5635 KO |
1984 | } else { |
1985 | struct cache *ca = kzalloc(sizeof(*ca), GFP_KERNEL); | |
f59fce84 KO |
1986 | if (!ca) |
1987 | goto err_close; | |
cafe5635 | 1988 | |
9b299728 EW |
1989 | if (register_cache(sb, sb_page, bdev, ca) != 0) |
1990 | goto err_close; | |
cafe5635 | 1991 | } |
f59fce84 KO |
1992 | out: |
1993 | if (sb_page) | |
cafe5635 | 1994 | put_page(sb_page); |
cafe5635 KO |
1995 | kfree(sb); |
1996 | kfree(path); | |
cafe5635 KO |
1997 | module_put(THIS_MODULE); |
1998 | return ret; | |
f59fce84 KO |
1999 | |
2000 | err_close: | |
2001 | blkdev_put(bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL); | |
2002 | err: | |
d7076f21 | 2003 | pr_info("error opening %s: %s", path, err); |
f59fce84 KO |
2004 | ret = -EINVAL; |
2005 | goto out; | |
cafe5635 KO |
2006 | } |
2007 | ||
2008 | static int bcache_reboot(struct notifier_block *n, unsigned long code, void *x) | |
2009 | { | |
2010 | if (code == SYS_DOWN || | |
2011 | code == SYS_HALT || | |
2012 | code == SYS_POWER_OFF) { | |
2013 | DEFINE_WAIT(wait); | |
2014 | unsigned long start = jiffies; | |
2015 | bool stopped = false; | |
2016 | ||
2017 | struct cache_set *c, *tc; | |
2018 | struct cached_dev *dc, *tdc; | |
2019 | ||
2020 | mutex_lock(&bch_register_lock); | |
2021 | ||
2022 | if (list_empty(&bch_cache_sets) && | |
2023 | list_empty(&uncached_devices)) | |
2024 | goto out; | |
2025 | ||
2026 | pr_info("Stopping all devices:"); | |
2027 | ||
2028 | list_for_each_entry_safe(c, tc, &bch_cache_sets, list) | |
2029 | bch_cache_set_stop(c); | |
2030 | ||
2031 | list_for_each_entry_safe(dc, tdc, &uncached_devices, list) | |
2032 | bcache_device_stop(&dc->disk); | |
2033 | ||
2034 | /* What's a condition variable? */ | |
2035 | while (1) { | |
2036 | long timeout = start + 2 * HZ - jiffies; | |
2037 | ||
2038 | stopped = list_empty(&bch_cache_sets) && | |
2039 | list_empty(&uncached_devices); | |
2040 | ||
2041 | if (timeout < 0 || stopped) | |
2042 | break; | |
2043 | ||
2044 | prepare_to_wait(&unregister_wait, &wait, | |
2045 | TASK_UNINTERRUPTIBLE); | |
2046 | ||
2047 | mutex_unlock(&bch_register_lock); | |
2048 | schedule_timeout(timeout); | |
2049 | mutex_lock(&bch_register_lock); | |
2050 | } | |
2051 | ||
2052 | finish_wait(&unregister_wait, &wait); | |
2053 | ||
2054 | if (stopped) | |
2055 | pr_info("All devices stopped"); | |
2056 | else | |
2057 | pr_notice("Timeout waiting for devices to be closed"); | |
2058 | out: | |
2059 | mutex_unlock(&bch_register_lock); | |
2060 | } | |
2061 | ||
2062 | return NOTIFY_DONE; | |
2063 | } | |
2064 | ||
2065 | static struct notifier_block reboot = { | |
2066 | .notifier_call = bcache_reboot, | |
2067 | .priority = INT_MAX, /* before any real devices */ | |
2068 | }; | |
2069 | ||
2070 | static void bcache_exit(void) | |
2071 | { | |
2072 | bch_debug_exit(); | |
cafe5635 | 2073 | bch_request_exit(); |
cafe5635 KO |
2074 | if (bcache_kobj) |
2075 | kobject_put(bcache_kobj); | |
2076 | if (bcache_wq) | |
2077 | destroy_workqueue(bcache_wq); | |
5c41c8a7 KO |
2078 | if (bcache_major) |
2079 | unregister_blkdev(bcache_major, "bcache"); | |
cafe5635 KO |
2080 | unregister_reboot_notifier(&reboot); |
2081 | } | |
2082 | ||
2083 | static int __init bcache_init(void) | |
2084 | { | |
2085 | static const struct attribute *files[] = { | |
2086 | &ksysfs_register.attr, | |
2087 | &ksysfs_register_quiet.attr, | |
2088 | NULL | |
2089 | }; | |
2090 | ||
2091 | mutex_init(&bch_register_lock); | |
2092 | init_waitqueue_head(&unregister_wait); | |
2093 | register_reboot_notifier(&reboot); | |
07e86ccb | 2094 | closure_debug_init(); |
cafe5635 KO |
2095 | |
2096 | bcache_major = register_blkdev(0, "bcache"); | |
2ecf0cdb ZL |
2097 | if (bcache_major < 0) { |
2098 | unregister_reboot_notifier(&reboot); | |
cafe5635 | 2099 | return bcache_major; |
2ecf0cdb | 2100 | } |
cafe5635 | 2101 | |
81baf90a | 2102 | if (!(bcache_wq = alloc_workqueue("bcache", WQ_MEM_RECLAIM, 0)) || |
cafe5635 KO |
2103 | !(bcache_kobj = kobject_create_and_add("bcache", fs_kobj)) || |
2104 | sysfs_create_files(bcache_kobj, files) || | |
cafe5635 | 2105 | bch_request_init() || |
cafe5635 KO |
2106 | bch_debug_init(bcache_kobj)) |
2107 | goto err; | |
2108 | ||
2109 | return 0; | |
2110 | err: | |
2111 | bcache_exit(); | |
2112 | return -ENOMEM; | |
2113 | } | |
2114 | ||
2115 | module_exit(bcache_exit); | |
2116 | module_init(bcache_init); |