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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) | |
b8c0d911 | 61 | #define BCACHE_MINORS 16 /* partition support */ |
cafe5635 | 62 | |
cafe5635 KO |
63 | /* Superblock */ |
64 | ||
65 | static const char *read_super(struct cache_sb *sb, struct block_device *bdev, | |
66 | struct page **res) | |
67 | { | |
68 | const char *err; | |
69 | struct cache_sb *s; | |
70 | struct buffer_head *bh = __bread(bdev, 1, SB_SIZE); | |
71 | unsigned i; | |
72 | ||
73 | if (!bh) | |
74 | return "IO error"; | |
75 | ||
76 | s = (struct cache_sb *) bh->b_data; | |
77 | ||
78 | sb->offset = le64_to_cpu(s->offset); | |
79 | sb->version = le64_to_cpu(s->version); | |
80 | ||
81 | memcpy(sb->magic, s->magic, 16); | |
82 | memcpy(sb->uuid, s->uuid, 16); | |
83 | memcpy(sb->set_uuid, s->set_uuid, 16); | |
84 | memcpy(sb->label, s->label, SB_LABEL_SIZE); | |
85 | ||
86 | sb->flags = le64_to_cpu(s->flags); | |
87 | sb->seq = le64_to_cpu(s->seq); | |
cafe5635 | 88 | sb->last_mount = le32_to_cpu(s->last_mount); |
cafe5635 KO |
89 | sb->first_bucket = le16_to_cpu(s->first_bucket); |
90 | sb->keys = le16_to_cpu(s->keys); | |
91 | ||
92 | for (i = 0; i < SB_JOURNAL_BUCKETS; i++) | |
93 | sb->d[i] = le64_to_cpu(s->d[i]); | |
94 | ||
95 | pr_debug("read sb version %llu, flags %llu, seq %llu, journal size %u", | |
96 | sb->version, sb->flags, sb->seq, sb->keys); | |
97 | ||
98 | err = "Not a bcache superblock"; | |
99 | if (sb->offset != SB_SECTOR) | |
100 | goto err; | |
101 | ||
102 | if (memcmp(sb->magic, bcache_magic, 16)) | |
103 | goto err; | |
104 | ||
105 | err = "Too many journal buckets"; | |
106 | if (sb->keys > SB_JOURNAL_BUCKETS) | |
107 | goto err; | |
108 | ||
109 | err = "Bad checksum"; | |
110 | if (s->csum != csum_set(s)) | |
111 | goto err; | |
112 | ||
113 | err = "Bad UUID"; | |
169ef1cf | 114 | if (bch_is_zero(sb->uuid, 16)) |
cafe5635 KO |
115 | goto err; |
116 | ||
8abb2a5d KO |
117 | sb->block_size = le16_to_cpu(s->block_size); |
118 | ||
119 | err = "Superblock block size smaller than device block size"; | |
120 | if (sb->block_size << 9 < bdev_logical_block_size(bdev)) | |
121 | goto err; | |
122 | ||
2903381f KO |
123 | switch (sb->version) { |
124 | case BCACHE_SB_VERSION_BDEV: | |
2903381f KO |
125 | sb->data_offset = BDEV_DATA_START_DEFAULT; |
126 | break; | |
127 | case BCACHE_SB_VERSION_BDEV_WITH_OFFSET: | |
2903381f KO |
128 | sb->data_offset = le64_to_cpu(s->data_offset); |
129 | ||
130 | err = "Bad data offset"; | |
131 | if (sb->data_offset < BDEV_DATA_START_DEFAULT) | |
132 | goto err; | |
cafe5635 | 133 | |
2903381f KO |
134 | break; |
135 | case BCACHE_SB_VERSION_CDEV: | |
136 | case BCACHE_SB_VERSION_CDEV_WITH_UUID: | |
137 | sb->nbuckets = le64_to_cpu(s->nbuckets); | |
2903381f | 138 | sb->bucket_size = le16_to_cpu(s->bucket_size); |
cafe5635 | 139 | |
2903381f KO |
140 | sb->nr_in_set = le16_to_cpu(s->nr_in_set); |
141 | sb->nr_this_dev = le16_to_cpu(s->nr_this_dev); | |
cafe5635 | 142 | |
2903381f KO |
143 | err = "Too many buckets"; |
144 | if (sb->nbuckets > LONG_MAX) | |
145 | goto err; | |
cafe5635 | 146 | |
2903381f KO |
147 | err = "Not enough buckets"; |
148 | if (sb->nbuckets < 1 << 7) | |
149 | goto err; | |
cafe5635 | 150 | |
2903381f KO |
151 | err = "Bad block/bucket size"; |
152 | if (!is_power_of_2(sb->block_size) || | |
153 | sb->block_size > PAGE_SECTORS || | |
154 | !is_power_of_2(sb->bucket_size) || | |
155 | sb->bucket_size < PAGE_SECTORS) | |
156 | goto err; | |
cafe5635 | 157 | |
2903381f KO |
158 | err = "Invalid superblock: device too small"; |
159 | if (get_capacity(bdev->bd_disk) < sb->bucket_size * sb->nbuckets) | |
160 | goto err; | |
cafe5635 | 161 | |
2903381f KO |
162 | err = "Bad UUID"; |
163 | if (bch_is_zero(sb->set_uuid, 16)) | |
164 | goto err; | |
cafe5635 | 165 | |
2903381f KO |
166 | err = "Bad cache device number in set"; |
167 | if (!sb->nr_in_set || | |
168 | sb->nr_in_set <= sb->nr_this_dev || | |
169 | sb->nr_in_set > MAX_CACHES_PER_SET) | |
cafe5635 KO |
170 | goto err; |
171 | ||
2903381f KO |
172 | err = "Journal buckets not sequential"; |
173 | for (i = 0; i < sb->keys; i++) | |
174 | if (sb->d[i] != sb->first_bucket + i) | |
175 | goto err; | |
cafe5635 | 176 | |
2903381f KO |
177 | err = "Too many journal buckets"; |
178 | if (sb->first_bucket + sb->keys > sb->nbuckets) | |
179 | goto err; | |
180 | ||
181 | err = "Invalid superblock: first bucket comes before end of super"; | |
182 | if (sb->first_bucket * sb->bucket_size < 16) | |
183 | goto err; | |
184 | ||
185 | break; | |
186 | default: | |
187 | err = "Unsupported superblock version"; | |
cafe5635 | 188 | goto err; |
2903381f KO |
189 | } |
190 | ||
cafe5635 KO |
191 | sb->last_mount = get_seconds(); |
192 | err = NULL; | |
193 | ||
194 | get_page(bh->b_page); | |
195 | *res = bh->b_page; | |
196 | err: | |
197 | put_bh(bh); | |
198 | return err; | |
199 | } | |
200 | ||
4246a0b6 | 201 | static void write_bdev_super_endio(struct bio *bio) |
cafe5635 KO |
202 | { |
203 | struct cached_dev *dc = bio->bi_private; | |
204 | /* XXX: error checking */ | |
205 | ||
cb7a583e | 206 | closure_put(&dc->sb_write); |
cafe5635 KO |
207 | } |
208 | ||
209 | static void __write_super(struct cache_sb *sb, struct bio *bio) | |
210 | { | |
211 | struct cache_sb *out = page_address(bio->bi_io_vec[0].bv_page); | |
212 | unsigned i; | |
213 | ||
4f024f37 | 214 | bio->bi_iter.bi_sector = SB_SECTOR; |
4f024f37 | 215 | bio->bi_iter.bi_size = SB_SIZE; |
ad0d9e76 | 216 | bio_set_op_attrs(bio, REQ_OP_WRITE, REQ_SYNC|REQ_META); |
169ef1cf | 217 | bch_bio_map(bio, NULL); |
cafe5635 KO |
218 | |
219 | out->offset = cpu_to_le64(sb->offset); | |
220 | out->version = cpu_to_le64(sb->version); | |
221 | ||
222 | memcpy(out->uuid, sb->uuid, 16); | |
223 | memcpy(out->set_uuid, sb->set_uuid, 16); | |
224 | memcpy(out->label, sb->label, SB_LABEL_SIZE); | |
225 | ||
226 | out->flags = cpu_to_le64(sb->flags); | |
227 | out->seq = cpu_to_le64(sb->seq); | |
228 | ||
229 | out->last_mount = cpu_to_le32(sb->last_mount); | |
230 | out->first_bucket = cpu_to_le16(sb->first_bucket); | |
231 | out->keys = cpu_to_le16(sb->keys); | |
232 | ||
233 | for (i = 0; i < sb->keys; i++) | |
234 | out->d[i] = cpu_to_le64(sb->d[i]); | |
235 | ||
236 | out->csum = csum_set(out); | |
237 | ||
238 | pr_debug("ver %llu, flags %llu, seq %llu", | |
239 | sb->version, sb->flags, sb->seq); | |
240 | ||
4e49ea4a | 241 | submit_bio(bio); |
cafe5635 KO |
242 | } |
243 | ||
cb7a583e KO |
244 | static void bch_write_bdev_super_unlock(struct closure *cl) |
245 | { | |
246 | struct cached_dev *dc = container_of(cl, struct cached_dev, sb_write); | |
247 | ||
248 | up(&dc->sb_write_mutex); | |
249 | } | |
250 | ||
cafe5635 KO |
251 | void bch_write_bdev_super(struct cached_dev *dc, struct closure *parent) |
252 | { | |
cb7a583e | 253 | struct closure *cl = &dc->sb_write; |
cafe5635 KO |
254 | struct bio *bio = &dc->sb_bio; |
255 | ||
cb7a583e KO |
256 | down(&dc->sb_write_mutex); |
257 | closure_init(cl, parent); | |
cafe5635 KO |
258 | |
259 | bio_reset(bio); | |
260 | bio->bi_bdev = dc->bdev; | |
261 | bio->bi_end_io = write_bdev_super_endio; | |
262 | bio->bi_private = dc; | |
263 | ||
264 | closure_get(cl); | |
265 | __write_super(&dc->sb, bio); | |
266 | ||
cb7a583e | 267 | closure_return_with_destructor(cl, bch_write_bdev_super_unlock); |
cafe5635 KO |
268 | } |
269 | ||
4246a0b6 | 270 | static void write_super_endio(struct bio *bio) |
cafe5635 KO |
271 | { |
272 | struct cache *ca = bio->bi_private; | |
273 | ||
4e4cbee9 | 274 | bch_count_io_errors(ca, bio->bi_status, "writing superblock"); |
cb7a583e KO |
275 | closure_put(&ca->set->sb_write); |
276 | } | |
277 | ||
278 | static void bcache_write_super_unlock(struct closure *cl) | |
279 | { | |
280 | struct cache_set *c = container_of(cl, struct cache_set, sb_write); | |
281 | ||
282 | up(&c->sb_write_mutex); | |
cafe5635 KO |
283 | } |
284 | ||
285 | void bcache_write_super(struct cache_set *c) | |
286 | { | |
cb7a583e | 287 | struct closure *cl = &c->sb_write; |
cafe5635 KO |
288 | struct cache *ca; |
289 | unsigned i; | |
290 | ||
cb7a583e KO |
291 | down(&c->sb_write_mutex); |
292 | closure_init(cl, &c->cl); | |
cafe5635 KO |
293 | |
294 | c->sb.seq++; | |
295 | ||
296 | for_each_cache(ca, c, i) { | |
297 | struct bio *bio = &ca->sb_bio; | |
298 | ||
2903381f | 299 | ca->sb.version = BCACHE_SB_VERSION_CDEV_WITH_UUID; |
cafe5635 KO |
300 | ca->sb.seq = c->sb.seq; |
301 | ca->sb.last_mount = c->sb.last_mount; | |
302 | ||
303 | SET_CACHE_SYNC(&ca->sb, CACHE_SYNC(&c->sb)); | |
304 | ||
305 | bio_reset(bio); | |
306 | bio->bi_bdev = ca->bdev; | |
307 | bio->bi_end_io = write_super_endio; | |
308 | bio->bi_private = ca; | |
309 | ||
310 | closure_get(cl); | |
311 | __write_super(&ca->sb, bio); | |
312 | } | |
313 | ||
cb7a583e | 314 | closure_return_with_destructor(cl, bcache_write_super_unlock); |
cafe5635 KO |
315 | } |
316 | ||
317 | /* UUID io */ | |
318 | ||
4246a0b6 | 319 | static void uuid_endio(struct bio *bio) |
cafe5635 KO |
320 | { |
321 | struct closure *cl = bio->bi_private; | |
cb7a583e | 322 | struct cache_set *c = container_of(cl, struct cache_set, uuid_write); |
cafe5635 | 323 | |
4e4cbee9 | 324 | cache_set_err_on(bio->bi_status, c, "accessing uuids"); |
cafe5635 KO |
325 | bch_bbio_free(bio, c); |
326 | closure_put(cl); | |
327 | } | |
328 | ||
cb7a583e KO |
329 | static void uuid_io_unlock(struct closure *cl) |
330 | { | |
331 | struct cache_set *c = container_of(cl, struct cache_set, uuid_write); | |
332 | ||
333 | up(&c->uuid_write_mutex); | |
334 | } | |
335 | ||
ad0d9e76 | 336 | static void uuid_io(struct cache_set *c, int op, unsigned long op_flags, |
cafe5635 KO |
337 | struct bkey *k, struct closure *parent) |
338 | { | |
cb7a583e | 339 | struct closure *cl = &c->uuid_write; |
cafe5635 KO |
340 | struct uuid_entry *u; |
341 | unsigned i; | |
85b1492e | 342 | char buf[80]; |
cafe5635 KO |
343 | |
344 | BUG_ON(!parent); | |
cb7a583e KO |
345 | down(&c->uuid_write_mutex); |
346 | closure_init(cl, parent); | |
cafe5635 KO |
347 | |
348 | for (i = 0; i < KEY_PTRS(k); i++) { | |
349 | struct bio *bio = bch_bbio_alloc(c); | |
350 | ||
1eff9d32 | 351 | bio->bi_opf = REQ_SYNC | REQ_META | op_flags; |
4f024f37 | 352 | bio->bi_iter.bi_size = KEY_SIZE(k) << 9; |
cafe5635 KO |
353 | |
354 | bio->bi_end_io = uuid_endio; | |
355 | bio->bi_private = cl; | |
ad0d9e76 | 356 | bio_set_op_attrs(bio, op, REQ_SYNC|REQ_META|op_flags); |
169ef1cf | 357 | bch_bio_map(bio, c->uuids); |
cafe5635 KO |
358 | |
359 | bch_submit_bbio(bio, c, k, i); | |
360 | ||
ad0d9e76 | 361 | if (op != REQ_OP_WRITE) |
cafe5635 KO |
362 | break; |
363 | } | |
364 | ||
dc9d98d6 | 365 | bch_extent_to_text(buf, sizeof(buf), k); |
ad0d9e76 | 366 | pr_debug("%s UUIDs at %s", op == REQ_OP_WRITE ? "wrote" : "read", buf); |
cafe5635 KO |
367 | |
368 | for (u = c->uuids; u < c->uuids + c->nr_uuids; u++) | |
169ef1cf | 369 | if (!bch_is_zero(u->uuid, 16)) |
cafe5635 KO |
370 | pr_debug("Slot %zi: %pU: %s: 1st: %u last: %u inv: %u", |
371 | u - c->uuids, u->uuid, u->label, | |
372 | u->first_reg, u->last_reg, u->invalidated); | |
373 | ||
cb7a583e | 374 | closure_return_with_destructor(cl, uuid_io_unlock); |
cafe5635 KO |
375 | } |
376 | ||
377 | static char *uuid_read(struct cache_set *c, struct jset *j, struct closure *cl) | |
378 | { | |
379 | struct bkey *k = &j->uuid_bucket; | |
380 | ||
65d45231 | 381 | if (__bch_btree_ptr_invalid(c, k)) |
cafe5635 KO |
382 | return "bad uuid pointer"; |
383 | ||
384 | bkey_copy(&c->uuid_bucket, k); | |
70fd7614 | 385 | uuid_io(c, REQ_OP_READ, 0, k, cl); |
cafe5635 KO |
386 | |
387 | if (j->version < BCACHE_JSET_VERSION_UUIDv1) { | |
388 | struct uuid_entry_v0 *u0 = (void *) c->uuids; | |
389 | struct uuid_entry *u1 = (void *) c->uuids; | |
390 | int i; | |
391 | ||
392 | closure_sync(cl); | |
393 | ||
394 | /* | |
395 | * Since the new uuid entry is bigger than the old, we have to | |
396 | * convert starting at the highest memory address and work down | |
397 | * in order to do it in place | |
398 | */ | |
399 | ||
400 | for (i = c->nr_uuids - 1; | |
401 | i >= 0; | |
402 | --i) { | |
403 | memcpy(u1[i].uuid, u0[i].uuid, 16); | |
404 | memcpy(u1[i].label, u0[i].label, 32); | |
405 | ||
406 | u1[i].first_reg = u0[i].first_reg; | |
407 | u1[i].last_reg = u0[i].last_reg; | |
408 | u1[i].invalidated = u0[i].invalidated; | |
409 | ||
410 | u1[i].flags = 0; | |
411 | u1[i].sectors = 0; | |
412 | } | |
413 | } | |
414 | ||
415 | return NULL; | |
416 | } | |
417 | ||
418 | static int __uuid_write(struct cache_set *c) | |
419 | { | |
420 | BKEY_PADDED(key) k; | |
421 | struct closure cl; | |
422 | closure_init_stack(&cl); | |
423 | ||
424 | lockdep_assert_held(&bch_register_lock); | |
425 | ||
78365411 | 426 | if (bch_bucket_alloc_set(c, RESERVE_BTREE, &k.key, 1, true)) |
cafe5635 KO |
427 | return 1; |
428 | ||
429 | SET_KEY_SIZE(&k.key, c->sb.bucket_size); | |
ad0d9e76 | 430 | uuid_io(c, REQ_OP_WRITE, 0, &k.key, &cl); |
cafe5635 KO |
431 | closure_sync(&cl); |
432 | ||
433 | bkey_copy(&c->uuid_bucket, &k.key); | |
3a3b6a4e | 434 | bkey_put(c, &k.key); |
cafe5635 KO |
435 | return 0; |
436 | } | |
437 | ||
438 | int bch_uuid_write(struct cache_set *c) | |
439 | { | |
440 | int ret = __uuid_write(c); | |
441 | ||
442 | if (!ret) | |
443 | bch_journal_meta(c, NULL); | |
444 | ||
445 | return ret; | |
446 | } | |
447 | ||
448 | static struct uuid_entry *uuid_find(struct cache_set *c, const char *uuid) | |
449 | { | |
450 | struct uuid_entry *u; | |
451 | ||
452 | for (u = c->uuids; | |
453 | u < c->uuids + c->nr_uuids; u++) | |
454 | if (!memcmp(u->uuid, uuid, 16)) | |
455 | return u; | |
456 | ||
457 | return NULL; | |
458 | } | |
459 | ||
460 | static struct uuid_entry *uuid_find_empty(struct cache_set *c) | |
461 | { | |
462 | static const char zero_uuid[16] = "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"; | |
463 | return uuid_find(c, zero_uuid); | |
464 | } | |
465 | ||
466 | /* | |
467 | * Bucket priorities/gens: | |
468 | * | |
469 | * For each bucket, we store on disk its | |
470 | * 8 bit gen | |
471 | * 16 bit priority | |
472 | * | |
473 | * See alloc.c for an explanation of the gen. The priority is used to implement | |
474 | * lru (and in the future other) cache replacement policies; for most purposes | |
475 | * it's just an opaque integer. | |
476 | * | |
477 | * The gens and the priorities don't have a whole lot to do with each other, and | |
478 | * it's actually the gens that must be written out at specific times - it's no | |
479 | * big deal if the priorities don't get written, if we lose them we just reuse | |
480 | * buckets in suboptimal order. | |
481 | * | |
482 | * On disk they're stored in a packed array, and in as many buckets are required | |
483 | * to fit them all. The buckets we use to store them form a list; the journal | |
484 | * header points to the first bucket, the first bucket points to the second | |
485 | * bucket, et cetera. | |
486 | * | |
487 | * This code is used by the allocation code; periodically (whenever it runs out | |
488 | * of buckets to allocate from) the allocation code will invalidate some | |
489 | * buckets, but it can't use those buckets until their new gens are safely on | |
490 | * disk. | |
491 | */ | |
492 | ||
4246a0b6 | 493 | static void prio_endio(struct bio *bio) |
cafe5635 KO |
494 | { |
495 | struct cache *ca = bio->bi_private; | |
496 | ||
4e4cbee9 | 497 | cache_set_err_on(bio->bi_status, ca->set, "accessing priorities"); |
cafe5635 KO |
498 | bch_bbio_free(bio, ca->set); |
499 | closure_put(&ca->prio); | |
500 | } | |
501 | ||
ad0d9e76 MC |
502 | static void prio_io(struct cache *ca, uint64_t bucket, int op, |
503 | unsigned long op_flags) | |
cafe5635 KO |
504 | { |
505 | struct closure *cl = &ca->prio; | |
506 | struct bio *bio = bch_bbio_alloc(ca->set); | |
507 | ||
508 | closure_init_stack(cl); | |
509 | ||
4f024f37 KO |
510 | bio->bi_iter.bi_sector = bucket * ca->sb.bucket_size; |
511 | bio->bi_bdev = ca->bdev; | |
4f024f37 | 512 | bio->bi_iter.bi_size = bucket_bytes(ca); |
cafe5635 KO |
513 | |
514 | bio->bi_end_io = prio_endio; | |
515 | bio->bi_private = ca; | |
ad0d9e76 | 516 | bio_set_op_attrs(bio, op, REQ_SYNC|REQ_META|op_flags); |
169ef1cf | 517 | bch_bio_map(bio, ca->disk_buckets); |
cafe5635 | 518 | |
749b61da | 519 | closure_bio_submit(bio, &ca->prio); |
cafe5635 KO |
520 | closure_sync(cl); |
521 | } | |
522 | ||
cafe5635 KO |
523 | void bch_prio_write(struct cache *ca) |
524 | { | |
525 | int i; | |
526 | struct bucket *b; | |
527 | struct closure cl; | |
528 | ||
529 | closure_init_stack(&cl); | |
530 | ||
531 | lockdep_assert_held(&ca->set->bucket_lock); | |
532 | ||
cafe5635 KO |
533 | ca->disk_buckets->seq++; |
534 | ||
535 | atomic_long_add(ca->sb.bucket_size * prio_buckets(ca), | |
536 | &ca->meta_sectors_written); | |
537 | ||
78365411 KO |
538 | //pr_debug("free %zu, free_inc %zu, unused %zu", fifo_used(&ca->free), |
539 | // fifo_used(&ca->free_inc), fifo_used(&ca->unused)); | |
cafe5635 KO |
540 | |
541 | for (i = prio_buckets(ca) - 1; i >= 0; --i) { | |
542 | long bucket; | |
543 | struct prio_set *p = ca->disk_buckets; | |
b1a67b0f KO |
544 | struct bucket_disk *d = p->data; |
545 | struct bucket_disk *end = d + prios_per_bucket(ca); | |
cafe5635 KO |
546 | |
547 | for (b = ca->buckets + i * prios_per_bucket(ca); | |
548 | b < ca->buckets + ca->sb.nbuckets && d < end; | |
549 | b++, d++) { | |
550 | d->prio = cpu_to_le16(b->prio); | |
551 | d->gen = b->gen; | |
552 | } | |
553 | ||
554 | p->next_bucket = ca->prio_buckets[i + 1]; | |
81ab4190 | 555 | p->magic = pset_magic(&ca->sb); |
169ef1cf | 556 | p->csum = bch_crc64(&p->magic, bucket_bytes(ca) - 8); |
cafe5635 | 557 | |
78365411 | 558 | bucket = bch_bucket_alloc(ca, RESERVE_PRIO, true); |
cafe5635 KO |
559 | BUG_ON(bucket == -1); |
560 | ||
561 | mutex_unlock(&ca->set->bucket_lock); | |
ad0d9e76 | 562 | prio_io(ca, bucket, REQ_OP_WRITE, 0); |
cafe5635 KO |
563 | mutex_lock(&ca->set->bucket_lock); |
564 | ||
565 | ca->prio_buckets[i] = bucket; | |
566 | atomic_dec_bug(&ca->buckets[bucket].pin); | |
567 | } | |
568 | ||
569 | mutex_unlock(&ca->set->bucket_lock); | |
570 | ||
571 | bch_journal_meta(ca->set, &cl); | |
572 | closure_sync(&cl); | |
573 | ||
574 | mutex_lock(&ca->set->bucket_lock); | |
575 | ||
cafe5635 KO |
576 | /* |
577 | * Don't want the old priorities to get garbage collected until after we | |
578 | * finish writing the new ones, and they're journalled | |
579 | */ | |
2531d9ee KO |
580 | for (i = 0; i < prio_buckets(ca); i++) { |
581 | if (ca->prio_last_buckets[i]) | |
582 | __bch_bucket_free(ca, | |
583 | &ca->buckets[ca->prio_last_buckets[i]]); | |
584 | ||
cafe5635 | 585 | ca->prio_last_buckets[i] = ca->prio_buckets[i]; |
2531d9ee | 586 | } |
cafe5635 KO |
587 | } |
588 | ||
589 | static void prio_read(struct cache *ca, uint64_t bucket) | |
590 | { | |
591 | struct prio_set *p = ca->disk_buckets; | |
592 | struct bucket_disk *d = p->data + prios_per_bucket(ca), *end = d; | |
593 | struct bucket *b; | |
594 | unsigned bucket_nr = 0; | |
595 | ||
596 | for (b = ca->buckets; | |
597 | b < ca->buckets + ca->sb.nbuckets; | |
598 | b++, d++) { | |
599 | if (d == end) { | |
600 | ca->prio_buckets[bucket_nr] = bucket; | |
601 | ca->prio_last_buckets[bucket_nr] = bucket; | |
602 | bucket_nr++; | |
603 | ||
70fd7614 | 604 | prio_io(ca, bucket, REQ_OP_READ, 0); |
cafe5635 | 605 | |
169ef1cf | 606 | if (p->csum != bch_crc64(&p->magic, bucket_bytes(ca) - 8)) |
cafe5635 KO |
607 | pr_warn("bad csum reading priorities"); |
608 | ||
81ab4190 | 609 | if (p->magic != pset_magic(&ca->sb)) |
cafe5635 KO |
610 | pr_warn("bad magic reading priorities"); |
611 | ||
612 | bucket = p->next_bucket; | |
613 | d = p->data; | |
614 | } | |
615 | ||
616 | b->prio = le16_to_cpu(d->prio); | |
3a2fd9d5 | 617 | b->gen = b->last_gc = d->gen; |
cafe5635 KO |
618 | } |
619 | } | |
620 | ||
621 | /* Bcache device */ | |
622 | ||
623 | static int open_dev(struct block_device *b, fmode_t mode) | |
624 | { | |
625 | struct bcache_device *d = b->bd_disk->private_data; | |
c4d951dd | 626 | if (test_bit(BCACHE_DEV_CLOSING, &d->flags)) |
cafe5635 KO |
627 | return -ENXIO; |
628 | ||
629 | closure_get(&d->cl); | |
630 | return 0; | |
631 | } | |
632 | ||
867e1162 | 633 | static void release_dev(struct gendisk *b, fmode_t mode) |
cafe5635 KO |
634 | { |
635 | struct bcache_device *d = b->private_data; | |
636 | closure_put(&d->cl); | |
cafe5635 KO |
637 | } |
638 | ||
639 | static int ioctl_dev(struct block_device *b, fmode_t mode, | |
640 | unsigned int cmd, unsigned long arg) | |
641 | { | |
642 | struct bcache_device *d = b->bd_disk->private_data; | |
643 | return d->ioctl(d, mode, cmd, arg); | |
644 | } | |
645 | ||
646 | static const struct block_device_operations bcache_ops = { | |
647 | .open = open_dev, | |
648 | .release = release_dev, | |
649 | .ioctl = ioctl_dev, | |
650 | .owner = THIS_MODULE, | |
651 | }; | |
652 | ||
653 | void bcache_device_stop(struct bcache_device *d) | |
654 | { | |
c4d951dd | 655 | if (!test_and_set_bit(BCACHE_DEV_CLOSING, &d->flags)) |
cafe5635 KO |
656 | closure_queue(&d->cl); |
657 | } | |
658 | ||
ee668506 KO |
659 | static void bcache_device_unlink(struct bcache_device *d) |
660 | { | |
c4d951dd | 661 | lockdep_assert_held(&bch_register_lock); |
ee668506 | 662 | |
c4d951dd KO |
663 | if (d->c && !test_and_set_bit(BCACHE_DEV_UNLINK_DONE, &d->flags)) { |
664 | unsigned i; | |
665 | struct cache *ca; | |
ee668506 | 666 | |
c4d951dd KO |
667 | sysfs_remove_link(&d->c->kobj, d->name); |
668 | sysfs_remove_link(&d->kobj, "cache"); | |
669 | ||
670 | for_each_cache(ca, d->c, i) | |
671 | bd_unlink_disk_holder(ca->bdev, d->disk); | |
672 | } | |
ee668506 KO |
673 | } |
674 | ||
675 | static void bcache_device_link(struct bcache_device *d, struct cache_set *c, | |
676 | const char *name) | |
677 | { | |
678 | unsigned i; | |
679 | struct cache *ca; | |
680 | ||
681 | for_each_cache(ca, d->c, i) | |
682 | bd_link_disk_holder(ca->bdev, d->disk); | |
683 | ||
684 | snprintf(d->name, BCACHEDEVNAME_SIZE, | |
685 | "%s%u", name, d->id); | |
686 | ||
687 | WARN(sysfs_create_link(&d->kobj, &c->kobj, "cache") || | |
688 | sysfs_create_link(&c->kobj, &d->kobj, d->name), | |
689 | "Couldn't create device <-> cache set symlinks"); | |
fecaee6f ZL |
690 | |
691 | clear_bit(BCACHE_DEV_UNLINK_DONE, &d->flags); | |
ee668506 KO |
692 | } |
693 | ||
cafe5635 KO |
694 | static void bcache_device_detach(struct bcache_device *d) |
695 | { | |
696 | lockdep_assert_held(&bch_register_lock); | |
697 | ||
c4d951dd | 698 | if (test_bit(BCACHE_DEV_DETACHING, &d->flags)) { |
cafe5635 KO |
699 | struct uuid_entry *u = d->c->uuids + d->id; |
700 | ||
701 | SET_UUID_FLASH_ONLY(u, 0); | |
702 | memcpy(u->uuid, invalid_uuid, 16); | |
703 | u->invalidated = cpu_to_le32(get_seconds()); | |
704 | bch_uuid_write(d->c); | |
cafe5635 KO |
705 | } |
706 | ||
c4d951dd | 707 | bcache_device_unlink(d); |
ee668506 | 708 | |
cafe5635 KO |
709 | d->c->devices[d->id] = NULL; |
710 | closure_put(&d->c->caching); | |
711 | d->c = NULL; | |
712 | } | |
713 | ||
714 | static void bcache_device_attach(struct bcache_device *d, struct cache_set *c, | |
715 | unsigned id) | |
716 | { | |
cafe5635 KO |
717 | d->id = id; |
718 | d->c = c; | |
719 | c->devices[id] = d; | |
720 | ||
721 | closure_get(&c->caching); | |
722 | } | |
723 | ||
cafe5635 KO |
724 | static void bcache_device_free(struct bcache_device *d) |
725 | { | |
726 | lockdep_assert_held(&bch_register_lock); | |
727 | ||
728 | pr_info("%s stopped", d->disk->disk_name); | |
729 | ||
730 | if (d->c) | |
731 | bcache_device_detach(d); | |
f59fce84 | 732 | if (d->disk && d->disk->flags & GENHD_FL_UP) |
cafe5635 KO |
733 | del_gendisk(d->disk); |
734 | if (d->disk && d->disk->queue) | |
735 | blk_cleanup_queue(d->disk->queue); | |
28935ab5 KO |
736 | if (d->disk) { |
737 | ida_simple_remove(&bcache_minor, d->disk->first_minor); | |
cafe5635 | 738 | put_disk(d->disk); |
28935ab5 | 739 | } |
cafe5635 | 740 | |
cafe5635 KO |
741 | if (d->bio_split) |
742 | bioset_free(d->bio_split); | |
958b4338 PE |
743 | kvfree(d->full_dirty_stripes); |
744 | kvfree(d->stripe_sectors_dirty); | |
cafe5635 KO |
745 | |
746 | closure_debug_destroy(&d->cl); | |
747 | } | |
748 | ||
279afbad KO |
749 | static int bcache_device_init(struct bcache_device *d, unsigned block_size, |
750 | sector_t sectors) | |
cafe5635 KO |
751 | { |
752 | struct request_queue *q; | |
279afbad | 753 | size_t n; |
28935ab5 | 754 | int minor; |
279afbad | 755 | |
2d679fc7 KO |
756 | if (!d->stripe_size) |
757 | d->stripe_size = 1 << 31; | |
279afbad | 758 | |
2d679fc7 | 759 | d->nr_stripes = DIV_ROUND_UP_ULL(sectors, d->stripe_size); |
279afbad | 760 | |
48a915a8 KO |
761 | if (!d->nr_stripes || |
762 | d->nr_stripes > INT_MAX || | |
763 | d->nr_stripes > SIZE_MAX / sizeof(atomic_t)) { | |
90706094 EW |
764 | pr_err("nr_stripes too large or invalid: %u (start sector beyond end of disk?)", |
765 | (unsigned)d->nr_stripes); | |
279afbad | 766 | return -ENOMEM; |
48a915a8 | 767 | } |
279afbad KO |
768 | |
769 | n = d->nr_stripes * sizeof(atomic_t); | |
bc4e54f6 | 770 | d->stripe_sectors_dirty = kvzalloc(n, GFP_KERNEL); |
279afbad KO |
771 | if (!d->stripe_sectors_dirty) |
772 | return -ENOMEM; | |
cafe5635 | 773 | |
48a915a8 | 774 | n = BITS_TO_LONGS(d->nr_stripes) * sizeof(unsigned long); |
bc4e54f6 | 775 | d->full_dirty_stripes = kvzalloc(n, GFP_KERNEL); |
48a915a8 KO |
776 | if (!d->full_dirty_stripes) |
777 | return -ENOMEM; | |
778 | ||
28935ab5 KO |
779 | minor = ida_simple_get(&bcache_minor, 0, MINORMASK + 1, GFP_KERNEL); |
780 | if (minor < 0) | |
781 | return minor; | |
782 | ||
b8c0d911 EW |
783 | minor *= BCACHE_MINORS; |
784 | ||
47e0fb46 N |
785 | if (!(d->bio_split = bioset_create(4, offsetof(struct bbio, bio), |
786 | BIOSET_NEED_BVECS | | |
787 | BIOSET_NEED_RESCUER)) || | |
b8c0d911 | 788 | !(d->disk = alloc_disk(BCACHE_MINORS))) { |
28935ab5 | 789 | ida_simple_remove(&bcache_minor, minor); |
cafe5635 | 790 | return -ENOMEM; |
28935ab5 | 791 | } |
cafe5635 | 792 | |
279afbad | 793 | set_capacity(d->disk, sectors); |
28935ab5 | 794 | snprintf(d->disk->disk_name, DISK_NAME_LEN, "bcache%i", minor); |
cafe5635 KO |
795 | |
796 | d->disk->major = bcache_major; | |
28935ab5 | 797 | d->disk->first_minor = minor; |
cafe5635 KO |
798 | d->disk->fops = &bcache_ops; |
799 | d->disk->private_data = d; | |
800 | ||
28935ab5 KO |
801 | q = blk_alloc_queue(GFP_KERNEL); |
802 | if (!q) | |
803 | return -ENOMEM; | |
804 | ||
cafe5635 KO |
805 | blk_queue_make_request(q, NULL); |
806 | d->disk->queue = q; | |
807 | q->queuedata = d; | |
dc3b17cc | 808 | q->backing_dev_info->congested_data = d; |
cafe5635 KO |
809 | q->limits.max_hw_sectors = UINT_MAX; |
810 | q->limits.max_sectors = UINT_MAX; | |
811 | q->limits.max_segment_size = UINT_MAX; | |
812 | q->limits.max_segments = BIO_MAX_PAGES; | |
2bb4cd5c | 813 | blk_queue_max_discard_sectors(q, UINT_MAX); |
90db6919 | 814 | q->limits.discard_granularity = 512; |
cafe5635 KO |
815 | q->limits.io_min = block_size; |
816 | q->limits.logical_block_size = block_size; | |
817 | q->limits.physical_block_size = block_size; | |
818 | set_bit(QUEUE_FLAG_NONROT, &d->disk->queue->queue_flags); | |
b277da0a | 819 | clear_bit(QUEUE_FLAG_ADD_RANDOM, &d->disk->queue->queue_flags); |
cafe5635 KO |
820 | set_bit(QUEUE_FLAG_DISCARD, &d->disk->queue->queue_flags); |
821 | ||
84b4ff9e | 822 | blk_queue_write_cache(q, true, true); |
54d12f2b | 823 | |
cafe5635 KO |
824 | return 0; |
825 | } | |
826 | ||
827 | /* Cached device */ | |
828 | ||
829 | static void calc_cached_dev_sectors(struct cache_set *c) | |
830 | { | |
831 | uint64_t sectors = 0; | |
832 | struct cached_dev *dc; | |
833 | ||
834 | list_for_each_entry(dc, &c->cached_devs, list) | |
835 | sectors += bdev_sectors(dc->bdev); | |
836 | ||
837 | c->cached_dev_sectors = sectors; | |
838 | } | |
839 | ||
840 | void bch_cached_dev_run(struct cached_dev *dc) | |
841 | { | |
842 | struct bcache_device *d = &dc->disk; | |
ab9e1400 | 843 | char buf[SB_LABEL_SIZE + 1]; |
a25c32be GP |
844 | char *env[] = { |
845 | "DRIVER=bcache", | |
846 | kasprintf(GFP_KERNEL, "CACHED_UUID=%pU", dc->sb.uuid), | |
ab9e1400 GP |
847 | NULL, |
848 | NULL, | |
a25c32be | 849 | }; |
cafe5635 | 850 | |
ab9e1400 GP |
851 | memcpy(buf, dc->sb.label, SB_LABEL_SIZE); |
852 | buf[SB_LABEL_SIZE] = '\0'; | |
853 | env[2] = kasprintf(GFP_KERNEL, "CACHED_LABEL=%s", buf); | |
854 | ||
4d4d8573 AV |
855 | if (atomic_xchg(&dc->running, 1)) { |
856 | kfree(env[1]); | |
857 | kfree(env[2]); | |
cafe5635 | 858 | return; |
4d4d8573 | 859 | } |
cafe5635 KO |
860 | |
861 | if (!d->c && | |
862 | BDEV_STATE(&dc->sb) != BDEV_STATE_NONE) { | |
863 | struct closure cl; | |
864 | closure_init_stack(&cl); | |
865 | ||
866 | SET_BDEV_STATE(&dc->sb, BDEV_STATE_STALE); | |
867 | bch_write_bdev_super(dc, &cl); | |
868 | closure_sync(&cl); | |
869 | } | |
870 | ||
871 | add_disk(d->disk); | |
ee668506 | 872 | bd_link_disk_holder(dc->bdev, dc->disk.disk); |
a25c32be GP |
873 | /* won't show up in the uevent file, use udevadm monitor -e instead |
874 | * only class / kset properties are persistent */ | |
cafe5635 | 875 | kobject_uevent_env(&disk_to_dev(d->disk)->kobj, KOBJ_CHANGE, env); |
a25c32be | 876 | kfree(env[1]); |
ab9e1400 | 877 | kfree(env[2]); |
a25c32be | 878 | |
cafe5635 KO |
879 | if (sysfs_create_link(&d->kobj, &disk_to_dev(d->disk)->kobj, "dev") || |
880 | sysfs_create_link(&disk_to_dev(d->disk)->kobj, &d->kobj, "bcache")) | |
881 | pr_debug("error creating sysfs link"); | |
882 | } | |
883 | ||
884 | static void cached_dev_detach_finish(struct work_struct *w) | |
885 | { | |
886 | struct cached_dev *dc = container_of(w, struct cached_dev, detach); | |
887 | char buf[BDEVNAME_SIZE]; | |
888 | struct closure cl; | |
889 | closure_init_stack(&cl); | |
890 | ||
c4d951dd | 891 | BUG_ON(!test_bit(BCACHE_DEV_DETACHING, &dc->disk.flags)); |
cafe5635 KO |
892 | BUG_ON(atomic_read(&dc->count)); |
893 | ||
cafe5635 KO |
894 | mutex_lock(&bch_register_lock); |
895 | ||
896 | memset(&dc->sb.set_uuid, 0, 16); | |
897 | SET_BDEV_STATE(&dc->sb, BDEV_STATE_NONE); | |
898 | ||
899 | bch_write_bdev_super(dc, &cl); | |
900 | closure_sync(&cl); | |
901 | ||
902 | bcache_device_detach(&dc->disk); | |
903 | list_move(&dc->list, &uncached_devices); | |
904 | ||
c4d951dd | 905 | clear_bit(BCACHE_DEV_DETACHING, &dc->disk.flags); |
5b1016e6 | 906 | clear_bit(BCACHE_DEV_UNLINK_DONE, &dc->disk.flags); |
c4d951dd | 907 | |
cafe5635 KO |
908 | mutex_unlock(&bch_register_lock); |
909 | ||
910 | pr_info("Caching disabled for %s", bdevname(dc->bdev, buf)); | |
911 | ||
912 | /* Drop ref we took in cached_dev_detach() */ | |
913 | closure_put(&dc->disk.cl); | |
914 | } | |
915 | ||
916 | void bch_cached_dev_detach(struct cached_dev *dc) | |
917 | { | |
918 | lockdep_assert_held(&bch_register_lock); | |
919 | ||
c4d951dd | 920 | if (test_bit(BCACHE_DEV_CLOSING, &dc->disk.flags)) |
cafe5635 KO |
921 | return; |
922 | ||
c4d951dd | 923 | if (test_and_set_bit(BCACHE_DEV_DETACHING, &dc->disk.flags)) |
cafe5635 KO |
924 | return; |
925 | ||
926 | /* | |
927 | * Block the device from being closed and freed until we're finished | |
928 | * detaching | |
929 | */ | |
930 | closure_get(&dc->disk.cl); | |
931 | ||
932 | bch_writeback_queue(dc); | |
933 | cached_dev_put(dc); | |
934 | } | |
935 | ||
936 | int bch_cached_dev_attach(struct cached_dev *dc, struct cache_set *c) | |
937 | { | |
938 | uint32_t rtime = cpu_to_le32(get_seconds()); | |
939 | struct uuid_entry *u; | |
940 | char buf[BDEVNAME_SIZE]; | |
941 | ||
942 | bdevname(dc->bdev, buf); | |
943 | ||
944 | if (memcmp(dc->sb.set_uuid, c->sb.set_uuid, 16)) | |
945 | return -ENOENT; | |
946 | ||
947 | if (dc->disk.c) { | |
948 | pr_err("Can't attach %s: already attached", buf); | |
949 | return -EINVAL; | |
950 | } | |
951 | ||
952 | if (test_bit(CACHE_SET_STOPPING, &c->flags)) { | |
953 | pr_err("Can't attach %s: shutting down", buf); | |
954 | return -EINVAL; | |
955 | } | |
956 | ||
957 | if (dc->sb.block_size < c->sb.block_size) { | |
958 | /* Will die */ | |
b1a67b0f KO |
959 | pr_err("Couldn't attach %s: block size less than set's block size", |
960 | buf); | |
cafe5635 KO |
961 | return -EINVAL; |
962 | } | |
963 | ||
964 | u = uuid_find(c, dc->sb.uuid); | |
965 | ||
966 | if (u && | |
967 | (BDEV_STATE(&dc->sb) == BDEV_STATE_STALE || | |
968 | BDEV_STATE(&dc->sb) == BDEV_STATE_NONE)) { | |
969 | memcpy(u->uuid, invalid_uuid, 16); | |
970 | u->invalidated = cpu_to_le32(get_seconds()); | |
971 | u = NULL; | |
972 | } | |
973 | ||
974 | if (!u) { | |
975 | if (BDEV_STATE(&dc->sb) == BDEV_STATE_DIRTY) { | |
976 | pr_err("Couldn't find uuid for %s in set", buf); | |
977 | return -ENOENT; | |
978 | } | |
979 | ||
980 | u = uuid_find_empty(c); | |
981 | if (!u) { | |
982 | pr_err("Not caching %s, no room for UUID", buf); | |
983 | return -EINVAL; | |
984 | } | |
985 | } | |
986 | ||
987 | /* Deadlocks since we're called via sysfs... | |
988 | sysfs_remove_file(&dc->kobj, &sysfs_attach); | |
989 | */ | |
990 | ||
169ef1cf | 991 | if (bch_is_zero(u->uuid, 16)) { |
cafe5635 KO |
992 | struct closure cl; |
993 | closure_init_stack(&cl); | |
994 | ||
995 | memcpy(u->uuid, dc->sb.uuid, 16); | |
996 | memcpy(u->label, dc->sb.label, SB_LABEL_SIZE); | |
997 | u->first_reg = u->last_reg = rtime; | |
998 | bch_uuid_write(c); | |
999 | ||
1000 | memcpy(dc->sb.set_uuid, c->sb.set_uuid, 16); | |
1001 | SET_BDEV_STATE(&dc->sb, BDEV_STATE_CLEAN); | |
1002 | ||
1003 | bch_write_bdev_super(dc, &cl); | |
1004 | closure_sync(&cl); | |
1005 | } else { | |
1006 | u->last_reg = rtime; | |
1007 | bch_uuid_write(c); | |
1008 | } | |
1009 | ||
1010 | bcache_device_attach(&dc->disk, c, u - c->uuids); | |
cafe5635 KO |
1011 | list_move(&dc->list, &c->cached_devs); |
1012 | calc_cached_dev_sectors(c); | |
1013 | ||
1014 | smp_wmb(); | |
1015 | /* | |
1016 | * dc->c must be set before dc->count != 0 - paired with the mb in | |
1017 | * cached_dev_get() | |
1018 | */ | |
1019 | atomic_set(&dc->count, 1); | |
1020 | ||
07cc6ef8 EW |
1021 | /* Block writeback thread, but spawn it */ |
1022 | down_write(&dc->writeback_lock); | |
1023 | if (bch_cached_dev_writeback_start(dc)) { | |
1024 | up_write(&dc->writeback_lock); | |
9e5c3535 | 1025 | return -ENOMEM; |
07cc6ef8 | 1026 | } |
9e5c3535 | 1027 | |
cafe5635 | 1028 | if (BDEV_STATE(&dc->sb) == BDEV_STATE_DIRTY) { |
444fc0b6 | 1029 | bch_sectors_dirty_init(dc); |
cafe5635 KO |
1030 | atomic_set(&dc->has_dirty, 1); |
1031 | atomic_inc(&dc->count); | |
1032 | bch_writeback_queue(dc); | |
1033 | } | |
1034 | ||
1035 | bch_cached_dev_run(dc); | |
ee668506 | 1036 | bcache_device_link(&dc->disk, c, "bdev"); |
cafe5635 | 1037 | |
07cc6ef8 EW |
1038 | /* Allow the writeback thread to proceed */ |
1039 | up_write(&dc->writeback_lock); | |
1040 | ||
cafe5635 KO |
1041 | pr_info("Caching %s as %s on set %pU", |
1042 | bdevname(dc->bdev, buf), dc->disk.disk->disk_name, | |
1043 | dc->disk.c->sb.set_uuid); | |
1044 | return 0; | |
1045 | } | |
1046 | ||
1047 | void bch_cached_dev_release(struct kobject *kobj) | |
1048 | { | |
1049 | struct cached_dev *dc = container_of(kobj, struct cached_dev, | |
1050 | disk.kobj); | |
1051 | kfree(dc); | |
1052 | module_put(THIS_MODULE); | |
1053 | } | |
1054 | ||
1055 | static void cached_dev_free(struct closure *cl) | |
1056 | { | |
1057 | struct cached_dev *dc = container_of(cl, struct cached_dev, disk.cl); | |
1058 | ||
1059 | cancel_delayed_work_sync(&dc->writeback_rate_update); | |
a664d0f0 SP |
1060 | if (!IS_ERR_OR_NULL(dc->writeback_thread)) |
1061 | kthread_stop(dc->writeback_thread); | |
cafe5635 KO |
1062 | |
1063 | mutex_lock(&bch_register_lock); | |
1064 | ||
f59fce84 KO |
1065 | if (atomic_read(&dc->running)) |
1066 | bd_unlink_disk_holder(dc->bdev, dc->disk.disk); | |
cafe5635 KO |
1067 | bcache_device_free(&dc->disk); |
1068 | list_del(&dc->list); | |
1069 | ||
1070 | mutex_unlock(&bch_register_lock); | |
1071 | ||
0781c874 | 1072 | if (!IS_ERR_OR_NULL(dc->bdev)) |
cafe5635 | 1073 | blkdev_put(dc->bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL); |
cafe5635 KO |
1074 | |
1075 | wake_up(&unregister_wait); | |
1076 | ||
1077 | kobject_put(&dc->disk.kobj); | |
1078 | } | |
1079 | ||
1080 | static void cached_dev_flush(struct closure *cl) | |
1081 | { | |
1082 | struct cached_dev *dc = container_of(cl, struct cached_dev, disk.cl); | |
1083 | struct bcache_device *d = &dc->disk; | |
1084 | ||
c9502ea4 | 1085 | mutex_lock(&bch_register_lock); |
c4d951dd | 1086 | bcache_device_unlink(d); |
c9502ea4 KO |
1087 | mutex_unlock(&bch_register_lock); |
1088 | ||
cafe5635 KO |
1089 | bch_cache_accounting_destroy(&dc->accounting); |
1090 | kobject_del(&d->kobj); | |
1091 | ||
1092 | continue_at(cl, cached_dev_free, system_wq); | |
1093 | } | |
1094 | ||
1095 | static int cached_dev_init(struct cached_dev *dc, unsigned block_size) | |
1096 | { | |
f59fce84 | 1097 | int ret; |
cafe5635 | 1098 | struct io *io; |
f59fce84 | 1099 | struct request_queue *q = bdev_get_queue(dc->bdev); |
cafe5635 KO |
1100 | |
1101 | __module_get(THIS_MODULE); | |
1102 | INIT_LIST_HEAD(&dc->list); | |
f59fce84 KO |
1103 | closure_init(&dc->disk.cl, NULL); |
1104 | set_closure_fn(&dc->disk.cl, cached_dev_flush, system_wq); | |
cafe5635 | 1105 | kobject_init(&dc->disk.kobj, &bch_cached_dev_ktype); |
cafe5635 | 1106 | INIT_WORK(&dc->detach, cached_dev_detach_finish); |
cb7a583e | 1107 | sema_init(&dc->sb_write_mutex, 1); |
f59fce84 KO |
1108 | INIT_LIST_HEAD(&dc->io_lru); |
1109 | spin_lock_init(&dc->io_lock); | |
1110 | bch_cache_accounting_init(&dc->accounting, &dc->disk.cl); | |
cafe5635 | 1111 | |
cafe5635 KO |
1112 | dc->sequential_cutoff = 4 << 20; |
1113 | ||
cafe5635 KO |
1114 | for (io = dc->io; io < dc->io + RECENT_IO; io++) { |
1115 | list_add(&io->lru, &dc->io_lru); | |
1116 | hlist_add_head(&io->hash, dc->io_hash + RECENT_IO); | |
1117 | } | |
1118 | ||
c78afc62 KO |
1119 | dc->disk.stripe_size = q->limits.io_opt >> 9; |
1120 | ||
1121 | if (dc->disk.stripe_size) | |
1122 | dc->partial_stripes_expensive = | |
1123 | q->limits.raid_partial_stripes_expensive; | |
1124 | ||
279afbad KO |
1125 | ret = bcache_device_init(&dc->disk, block_size, |
1126 | dc->bdev->bd_part->nr_sects - dc->sb.data_offset); | |
f59fce84 KO |
1127 | if (ret) |
1128 | return ret; | |
1129 | ||
1130 | set_capacity(dc->disk.disk, | |
1131 | dc->bdev->bd_part->nr_sects - dc->sb.data_offset); | |
1132 | ||
dc3b17cc JK |
1133 | dc->disk.disk->queue->backing_dev_info->ra_pages = |
1134 | max(dc->disk.disk->queue->backing_dev_info->ra_pages, | |
1135 | q->backing_dev_info->ra_pages); | |
f59fce84 KO |
1136 | |
1137 | bch_cached_dev_request_init(dc); | |
1138 | bch_cached_dev_writeback_init(dc); | |
cafe5635 | 1139 | return 0; |
cafe5635 KO |
1140 | } |
1141 | ||
1142 | /* Cached device - bcache superblock */ | |
1143 | ||
f59fce84 | 1144 | static void register_bdev(struct cache_sb *sb, struct page *sb_page, |
cafe5635 KO |
1145 | struct block_device *bdev, |
1146 | struct cached_dev *dc) | |
1147 | { | |
1148 | char name[BDEVNAME_SIZE]; | |
1149 | const char *err = "cannot allocate memory"; | |
cafe5635 KO |
1150 | struct cache_set *c; |
1151 | ||
cafe5635 | 1152 | memcpy(&dc->sb, sb, sizeof(struct cache_sb)); |
cafe5635 KO |
1153 | dc->bdev = bdev; |
1154 | dc->bdev->bd_holder = dc; | |
1155 | ||
3a83f467 | 1156 | bio_init(&dc->sb_bio, dc->sb_bio.bi_inline_vecs, 1); |
f59fce84 KO |
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); |
be628be0 | 1493 | init_waitqueue_head(&c->gc_wait); |
cb7a583e | 1494 | sema_init(&c->uuid_write_mutex, 1); |
65d22e91 | 1495 | |
65d22e91 KO |
1496 | spin_lock_init(&c->btree_gc_time.lock); |
1497 | spin_lock_init(&c->btree_split_time.lock); | |
1498 | spin_lock_init(&c->btree_read_time.lock); | |
e8e1d468 | 1499 | |
cafe5635 KO |
1500 | bch_moving_init_cache_set(c); |
1501 | ||
1502 | INIT_LIST_HEAD(&c->list); | |
1503 | INIT_LIST_HEAD(&c->cached_devs); | |
1504 | INIT_LIST_HEAD(&c->btree_cache); | |
1505 | INIT_LIST_HEAD(&c->btree_cache_freeable); | |
1506 | INIT_LIST_HEAD(&c->btree_cache_freed); | |
1507 | INIT_LIST_HEAD(&c->data_buckets); | |
1508 | ||
1509 | c->search = mempool_create_slab_pool(32, bch_search_cache); | |
1510 | if (!c->search) | |
1511 | goto err; | |
1512 | ||
1513 | iter_size = (sb->bucket_size / sb->block_size + 1) * | |
1514 | sizeof(struct btree_iter_set); | |
1515 | ||
1516 | if (!(c->devices = kzalloc(c->nr_uuids * sizeof(void *), GFP_KERNEL)) || | |
1517 | !(c->bio_meta = mempool_create_kmalloc_pool(2, | |
1518 | sizeof(struct bbio) + sizeof(struct bio_vec) * | |
1519 | bucket_pages(c))) || | |
57943511 | 1520 | !(c->fill_iter = mempool_create_kmalloc_pool(1, iter_size)) || |
47e0fb46 N |
1521 | !(c->bio_split = bioset_create(4, offsetof(struct bbio, bio), |
1522 | BIOSET_NEED_BVECS | | |
1523 | BIOSET_NEED_RESCUER)) || | |
cafe5635 | 1524 | !(c->uuids = alloc_bucket_pages(GFP_KERNEL, c)) || |
81baf90a BS |
1525 | !(c->moving_gc_wq = alloc_workqueue("bcache_gc", |
1526 | WQ_MEM_RECLAIM, 0)) || | |
cafe5635 KO |
1527 | bch_journal_alloc(c) || |
1528 | bch_btree_cache_alloc(c) || | |
67539e85 KO |
1529 | bch_open_buckets_alloc(c) || |
1530 | bch_bset_sort_state_init(&c->sort, ilog2(c->btree_pages))) | |
cafe5635 KO |
1531 | goto err; |
1532 | ||
cafe5635 KO |
1533 | c->congested_read_threshold_us = 2000; |
1534 | c->congested_write_threshold_us = 20000; | |
1535 | c->error_limit = 8 << IO_ERROR_SHIFT; | |
1536 | ||
1537 | return c; | |
1538 | err: | |
1539 | bch_cache_set_unregister(c); | |
1540 | return NULL; | |
1541 | } | |
1542 | ||
1543 | static void run_cache_set(struct cache_set *c) | |
1544 | { | |
1545 | const char *err = "cannot allocate memory"; | |
1546 | struct cached_dev *dc, *t; | |
1547 | struct cache *ca; | |
c18536a7 | 1548 | struct closure cl; |
cafe5635 KO |
1549 | unsigned i; |
1550 | ||
c18536a7 | 1551 | closure_init_stack(&cl); |
cafe5635 KO |
1552 | |
1553 | for_each_cache(ca, c, i) | |
1554 | c->nbuckets += ca->sb.nbuckets; | |
be628be0 | 1555 | set_gc_sectors(c); |
cafe5635 KO |
1556 | |
1557 | if (CACHE_SYNC(&c->sb)) { | |
1558 | LIST_HEAD(journal); | |
1559 | struct bkey *k; | |
1560 | struct jset *j; | |
1561 | ||
1562 | err = "cannot allocate memory for journal"; | |
c18536a7 | 1563 | if (bch_journal_read(c, &journal)) |
cafe5635 KO |
1564 | goto err; |
1565 | ||
1566 | pr_debug("btree_journal_read() done"); | |
1567 | ||
1568 | err = "no journal entries found"; | |
1569 | if (list_empty(&journal)) | |
1570 | goto err; | |
1571 | ||
1572 | j = &list_entry(journal.prev, struct journal_replay, list)->j; | |
1573 | ||
1574 | err = "IO error reading priorities"; | |
1575 | for_each_cache(ca, c, i) | |
1576 | prio_read(ca, j->prio_bucket[ca->sb.nr_this_dev]); | |
1577 | ||
1578 | /* | |
1579 | * If prio_read() fails it'll call cache_set_error and we'll | |
1580 | * tear everything down right away, but if we perhaps checked | |
1581 | * sooner we could avoid journal replay. | |
1582 | */ | |
1583 | ||
1584 | k = &j->btree_root; | |
1585 | ||
1586 | err = "bad btree root"; | |
65d45231 | 1587 | if (__bch_btree_ptr_invalid(c, k)) |
cafe5635 KO |
1588 | goto err; |
1589 | ||
1590 | err = "error reading btree root"; | |
2452cc89 | 1591 | c->root = bch_btree_node_get(c, NULL, k, j->btree_level, true, NULL); |
cafe5635 KO |
1592 | if (IS_ERR_OR_NULL(c->root)) |
1593 | goto err; | |
1594 | ||
1595 | list_del_init(&c->root->list); | |
1596 | rw_unlock(true, c->root); | |
1597 | ||
c18536a7 | 1598 | err = uuid_read(c, j, &cl); |
cafe5635 KO |
1599 | if (err) |
1600 | goto err; | |
1601 | ||
1602 | err = "error in recovery"; | |
c18536a7 | 1603 | if (bch_btree_check(c)) |
cafe5635 KO |
1604 | goto err; |
1605 | ||
1606 | bch_journal_mark(c, &journal); | |
2531d9ee | 1607 | bch_initial_gc_finish(c); |
cafe5635 KO |
1608 | pr_debug("btree_check() done"); |
1609 | ||
1610 | /* | |
1611 | * bcache_journal_next() can't happen sooner, or | |
1612 | * btree_gc_finish() will give spurious errors about last_gc > | |
1613 | * gc_gen - this is a hack but oh well. | |
1614 | */ | |
1615 | bch_journal_next(&c->journal); | |
1616 | ||
119ba0f8 | 1617 | err = "error starting allocator thread"; |
cafe5635 | 1618 | for_each_cache(ca, c, i) |
119ba0f8 KO |
1619 | if (bch_cache_allocator_start(ca)) |
1620 | goto err; | |
cafe5635 KO |
1621 | |
1622 | /* | |
1623 | * First place it's safe to allocate: btree_check() and | |
1624 | * btree_gc_finish() have to run before we have buckets to | |
1625 | * allocate, and bch_bucket_alloc_set() might cause a journal | |
1626 | * entry to be written so bcache_journal_next() has to be called | |
1627 | * first. | |
1628 | * | |
1629 | * If the uuids were in the old format we have to rewrite them | |
1630 | * before the next journal entry is written: | |
1631 | */ | |
1632 | if (j->version < BCACHE_JSET_VERSION_UUID) | |
1633 | __uuid_write(c); | |
1634 | ||
c18536a7 | 1635 | bch_journal_replay(c, &journal); |
cafe5635 KO |
1636 | } else { |
1637 | pr_notice("invalidating existing data"); | |
cafe5635 KO |
1638 | |
1639 | for_each_cache(ca, c, i) { | |
1640 | unsigned j; | |
1641 | ||
1642 | ca->sb.keys = clamp_t(int, ca->sb.nbuckets >> 7, | |
1643 | 2, SB_JOURNAL_BUCKETS); | |
1644 | ||
1645 | for (j = 0; j < ca->sb.keys; j++) | |
1646 | ca->sb.d[j] = ca->sb.first_bucket + j; | |
1647 | } | |
1648 | ||
2531d9ee | 1649 | bch_initial_gc_finish(c); |
cafe5635 | 1650 | |
119ba0f8 | 1651 | err = "error starting allocator thread"; |
cafe5635 | 1652 | for_each_cache(ca, c, i) |
119ba0f8 KO |
1653 | if (bch_cache_allocator_start(ca)) |
1654 | goto err; | |
cafe5635 KO |
1655 | |
1656 | mutex_lock(&c->bucket_lock); | |
1657 | for_each_cache(ca, c, i) | |
1658 | bch_prio_write(ca); | |
1659 | mutex_unlock(&c->bucket_lock); | |
1660 | ||
cafe5635 KO |
1661 | err = "cannot allocate new UUID bucket"; |
1662 | if (__uuid_write(c)) | |
72a44517 | 1663 | goto err; |
cafe5635 KO |
1664 | |
1665 | err = "cannot allocate new btree root"; | |
2452cc89 | 1666 | c->root = __bch_btree_node_alloc(c, NULL, 0, true, NULL); |
cafe5635 | 1667 | if (IS_ERR_OR_NULL(c->root)) |
72a44517 | 1668 | goto err; |
cafe5635 | 1669 | |
2a285686 | 1670 | mutex_lock(&c->root->write_lock); |
cafe5635 | 1671 | bkey_copy_key(&c->root->key, &MAX_KEY); |
c18536a7 | 1672 | bch_btree_node_write(c->root, &cl); |
2a285686 | 1673 | mutex_unlock(&c->root->write_lock); |
cafe5635 KO |
1674 | |
1675 | bch_btree_set_root(c->root); | |
1676 | rw_unlock(true, c->root); | |
1677 | ||
1678 | /* | |
1679 | * We don't want to write the first journal entry until | |
1680 | * everything is set up - fortunately journal entries won't be | |
1681 | * written until the SET_CACHE_SYNC() here: | |
1682 | */ | |
1683 | SET_CACHE_SYNC(&c->sb, true); | |
1684 | ||
1685 | bch_journal_next(&c->journal); | |
c18536a7 | 1686 | bch_journal_meta(c, &cl); |
cafe5635 KO |
1687 | } |
1688 | ||
72a44517 KO |
1689 | err = "error starting gc thread"; |
1690 | if (bch_gc_thread_start(c)) | |
1691 | goto err; | |
1692 | ||
c18536a7 | 1693 | closure_sync(&cl); |
cafe5635 KO |
1694 | c->sb.last_mount = get_seconds(); |
1695 | bcache_write_super(c); | |
1696 | ||
1697 | list_for_each_entry_safe(dc, t, &uncached_devices, list) | |
1698 | bch_cached_dev_attach(dc, c); | |
1699 | ||
1700 | flash_devs_run(c); | |
1701 | ||
bf0c55c9 | 1702 | set_bit(CACHE_SET_RUNNING, &c->flags); |
cafe5635 | 1703 | return; |
cafe5635 | 1704 | err: |
c18536a7 | 1705 | closure_sync(&cl); |
cafe5635 | 1706 | /* XXX: test this, it's broken */ |
c8694948 | 1707 | bch_cache_set_error(c, "%s", err); |
cafe5635 KO |
1708 | } |
1709 | ||
1710 | static bool can_attach_cache(struct cache *ca, struct cache_set *c) | |
1711 | { | |
1712 | return ca->sb.block_size == c->sb.block_size && | |
9eb8ebeb | 1713 | ca->sb.bucket_size == c->sb.bucket_size && |
cafe5635 KO |
1714 | ca->sb.nr_in_set == c->sb.nr_in_set; |
1715 | } | |
1716 | ||
1717 | static const char *register_cache_set(struct cache *ca) | |
1718 | { | |
1719 | char buf[12]; | |
1720 | const char *err = "cannot allocate memory"; | |
1721 | struct cache_set *c; | |
1722 | ||
1723 | list_for_each_entry(c, &bch_cache_sets, list) | |
1724 | if (!memcmp(c->sb.set_uuid, ca->sb.set_uuid, 16)) { | |
1725 | if (c->cache[ca->sb.nr_this_dev]) | |
1726 | return "duplicate cache set member"; | |
1727 | ||
1728 | if (!can_attach_cache(ca, c)) | |
1729 | return "cache sb does not match set"; | |
1730 | ||
1731 | if (!CACHE_SYNC(&ca->sb)) | |
1732 | SET_CACHE_SYNC(&c->sb, false); | |
1733 | ||
1734 | goto found; | |
1735 | } | |
1736 | ||
1737 | c = bch_cache_set_alloc(&ca->sb); | |
1738 | if (!c) | |
1739 | return err; | |
1740 | ||
1741 | err = "error creating kobject"; | |
1742 | if (kobject_add(&c->kobj, bcache_kobj, "%pU", c->sb.set_uuid) || | |
1743 | kobject_add(&c->internal, &c->kobj, "internal")) | |
1744 | goto err; | |
1745 | ||
1746 | if (bch_cache_accounting_add_kobjs(&c->accounting, &c->kobj)) | |
1747 | goto err; | |
1748 | ||
1749 | bch_debug_init_cache_set(c); | |
1750 | ||
1751 | list_add(&c->list, &bch_cache_sets); | |
1752 | found: | |
1753 | sprintf(buf, "cache%i", ca->sb.nr_this_dev); | |
1754 | if (sysfs_create_link(&ca->kobj, &c->kobj, "set") || | |
1755 | sysfs_create_link(&c->kobj, &ca->kobj, buf)) | |
1756 | goto err; | |
1757 | ||
1758 | if (ca->sb.seq > c->sb.seq) { | |
1759 | c->sb.version = ca->sb.version; | |
1760 | memcpy(c->sb.set_uuid, ca->sb.set_uuid, 16); | |
1761 | c->sb.flags = ca->sb.flags; | |
1762 | c->sb.seq = ca->sb.seq; | |
1763 | pr_debug("set version = %llu", c->sb.version); | |
1764 | } | |
1765 | ||
d83353b3 | 1766 | kobject_get(&ca->kobj); |
cafe5635 KO |
1767 | ca->set = c; |
1768 | ca->set->cache[ca->sb.nr_this_dev] = ca; | |
1769 | c->cache_by_alloc[c->caches_loaded++] = ca; | |
1770 | ||
1771 | if (c->caches_loaded == c->sb.nr_in_set) | |
1772 | run_cache_set(c); | |
1773 | ||
1774 | return NULL; | |
1775 | err: | |
1776 | bch_cache_set_unregister(c); | |
1777 | return err; | |
1778 | } | |
1779 | ||
1780 | /* Cache device */ | |
1781 | ||
1782 | void bch_cache_release(struct kobject *kobj) | |
1783 | { | |
1784 | struct cache *ca = container_of(kobj, struct cache, kobj); | |
78365411 | 1785 | unsigned i; |
cafe5635 | 1786 | |
c9a78332 SP |
1787 | if (ca->set) { |
1788 | BUG_ON(ca->set->cache[ca->sb.nr_this_dev] != ca); | |
cafe5635 | 1789 | ca->set->cache[ca->sb.nr_this_dev] = NULL; |
c9a78332 | 1790 | } |
cafe5635 | 1791 | |
cafe5635 KO |
1792 | free_pages((unsigned long) ca->disk_buckets, ilog2(bucket_pages(ca))); |
1793 | kfree(ca->prio_buckets); | |
1794 | vfree(ca->buckets); | |
1795 | ||
1796 | free_heap(&ca->heap); | |
cafe5635 | 1797 | free_fifo(&ca->free_inc); |
78365411 KO |
1798 | |
1799 | for (i = 0; i < RESERVE_NR; i++) | |
1800 | free_fifo(&ca->free[i]); | |
cafe5635 KO |
1801 | |
1802 | if (ca->sb_bio.bi_inline_vecs[0].bv_page) | |
1803 | put_page(ca->sb_bio.bi_io_vec[0].bv_page); | |
1804 | ||
0781c874 | 1805 | if (!IS_ERR_OR_NULL(ca->bdev)) |
cafe5635 | 1806 | blkdev_put(ca->bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL); |
cafe5635 KO |
1807 | |
1808 | kfree(ca); | |
1809 | module_put(THIS_MODULE); | |
1810 | } | |
1811 | ||
c50d4d5d | 1812 | static int cache_alloc(struct cache *ca) |
cafe5635 KO |
1813 | { |
1814 | size_t free; | |
1815 | struct bucket *b; | |
1816 | ||
cafe5635 KO |
1817 | __module_get(THIS_MODULE); |
1818 | kobject_init(&ca->kobj, &bch_cache_ktype); | |
1819 | ||
3a83f467 | 1820 | bio_init(&ca->journal.bio, ca->journal.bio.bi_inline_vecs, 8); |
cafe5635 | 1821 | |
78365411 | 1822 | free = roundup_pow_of_two(ca->sb.nbuckets) >> 10; |
cafe5635 | 1823 | |
78365411 | 1824 | if (!init_fifo(&ca->free[RESERVE_BTREE], 8, GFP_KERNEL) || |
acc9cf8c | 1825 | !init_fifo_exact(&ca->free[RESERVE_PRIO], prio_buckets(ca), GFP_KERNEL) || |
78365411 KO |
1826 | !init_fifo(&ca->free[RESERVE_MOVINGGC], free, GFP_KERNEL) || |
1827 | !init_fifo(&ca->free[RESERVE_NONE], free, GFP_KERNEL) || | |
cafe5635 | 1828 | !init_fifo(&ca->free_inc, free << 2, GFP_KERNEL) || |
cafe5635 | 1829 | !init_heap(&ca->heap, free << 3, GFP_KERNEL) || |
f59fce84 | 1830 | !(ca->buckets = vzalloc(sizeof(struct bucket) * |
cafe5635 KO |
1831 | ca->sb.nbuckets)) || |
1832 | !(ca->prio_buckets = kzalloc(sizeof(uint64_t) * prio_buckets(ca) * | |
1833 | 2, GFP_KERNEL)) || | |
749b61da | 1834 | !(ca->disk_buckets = alloc_bucket_pages(GFP_KERNEL, ca))) |
f59fce84 | 1835 | return -ENOMEM; |
cafe5635 KO |
1836 | |
1837 | ca->prio_last_buckets = ca->prio_buckets + prio_buckets(ca); | |
1838 | ||
cafe5635 KO |
1839 | for_each_bucket(b, ca) |
1840 | atomic_set(&b->pin, 0); | |
1841 | ||
cafe5635 | 1842 | return 0; |
cafe5635 KO |
1843 | } |
1844 | ||
9b299728 | 1845 | static int register_cache(struct cache_sb *sb, struct page *sb_page, |
c9a78332 | 1846 | struct block_device *bdev, struct cache *ca) |
cafe5635 KO |
1847 | { |
1848 | char name[BDEVNAME_SIZE]; | |
d9dc1702 | 1849 | const char *err = NULL; /* must be set for any error case */ |
9b299728 | 1850 | int ret = 0; |
cafe5635 | 1851 | |
f59fce84 | 1852 | memcpy(&ca->sb, sb, sizeof(struct cache_sb)); |
cafe5635 KO |
1853 | ca->bdev = bdev; |
1854 | ca->bdev->bd_holder = ca; | |
1855 | ||
3a83f467 | 1856 | bio_init(&ca->sb_bio, ca->sb_bio.bi_inline_vecs, 1); |
f59fce84 KO |
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); |
d9dc1702 EW |
1864 | if (ret != 0) { |
1865 | if (ret == -ENOMEM) | |
1866 | err = "cache_alloc(): -ENOMEM"; | |
1867 | else | |
1868 | err = "cache_alloc(): unknown error"; | |
f59fce84 | 1869 | goto err; |
d9dc1702 | 1870 | } |
f59fce84 | 1871 | |
9b299728 EW |
1872 | if (kobject_add(&ca->kobj, &part_to_dev(bdev->bd_part)->kobj, "bcache")) { |
1873 | err = "error calling kobject_add"; | |
1874 | ret = -ENOMEM; | |
1875 | goto out; | |
1876 | } | |
cafe5635 | 1877 | |
4fa03402 | 1878 | mutex_lock(&bch_register_lock); |
cafe5635 | 1879 | err = register_cache_set(ca); |
4fa03402 KO |
1880 | mutex_unlock(&bch_register_lock); |
1881 | ||
9b299728 EW |
1882 | if (err) { |
1883 | ret = -ENODEV; | |
1884 | goto out; | |
1885 | } | |
cafe5635 KO |
1886 | |
1887 | pr_info("registered cache device %s", bdevname(bdev, name)); | |
9b299728 | 1888 | |
d83353b3 KO |
1889 | out: |
1890 | kobject_put(&ca->kobj); | |
9b299728 | 1891 | |
cafe5635 | 1892 | err: |
9b299728 EW |
1893 | if (err) |
1894 | pr_notice("error opening %s: %s", bdevname(bdev, name), err); | |
1895 | ||
1896 | return ret; | |
cafe5635 KO |
1897 | } |
1898 | ||
1899 | /* Global interfaces/init */ | |
1900 | ||
1901 | static ssize_t register_bcache(struct kobject *, struct kobj_attribute *, | |
1902 | const char *, size_t); | |
1903 | ||
1904 | kobj_attribute_write(register, register_bcache); | |
1905 | kobj_attribute_write(register_quiet, register_bcache); | |
1906 | ||
a9dd53ad GP |
1907 | static bool bch_is_open_backing(struct block_device *bdev) { |
1908 | struct cache_set *c, *tc; | |
1909 | struct cached_dev *dc, *t; | |
1910 | ||
1911 | list_for_each_entry_safe(c, tc, &bch_cache_sets, list) | |
1912 | list_for_each_entry_safe(dc, t, &c->cached_devs, list) | |
1913 | if (dc->bdev == bdev) | |
1914 | return true; | |
1915 | list_for_each_entry_safe(dc, t, &uncached_devices, list) | |
1916 | if (dc->bdev == bdev) | |
1917 | return true; | |
1918 | return false; | |
1919 | } | |
1920 | ||
1921 | static bool bch_is_open_cache(struct block_device *bdev) { | |
1922 | struct cache_set *c, *tc; | |
1923 | struct cache *ca; | |
1924 | unsigned i; | |
1925 | ||
1926 | list_for_each_entry_safe(c, tc, &bch_cache_sets, list) | |
1927 | for_each_cache(ca, c, i) | |
1928 | if (ca->bdev == bdev) | |
1929 | return true; | |
1930 | return false; | |
1931 | } | |
1932 | ||
1933 | static bool bch_is_open(struct block_device *bdev) { | |
1934 | return bch_is_open_cache(bdev) || bch_is_open_backing(bdev); | |
1935 | } | |
1936 | ||
cafe5635 KO |
1937 | static ssize_t register_bcache(struct kobject *k, struct kobj_attribute *attr, |
1938 | const char *buffer, size_t size) | |
1939 | { | |
1940 | ssize_t ret = size; | |
1941 | const char *err = "cannot allocate memory"; | |
1942 | char *path = NULL; | |
1943 | struct cache_sb *sb = NULL; | |
1944 | struct block_device *bdev = NULL; | |
1945 | struct page *sb_page = NULL; | |
1946 | ||
1947 | if (!try_module_get(THIS_MODULE)) | |
1948 | return -EBUSY; | |
1949 | ||
cafe5635 KO |
1950 | if (!(path = kstrndup(buffer, size, GFP_KERNEL)) || |
1951 | !(sb = kmalloc(sizeof(struct cache_sb), GFP_KERNEL))) | |
1952 | goto err; | |
1953 | ||
1954 | err = "failed to open device"; | |
1955 | bdev = blkdev_get_by_path(strim(path), | |
1956 | FMODE_READ|FMODE_WRITE|FMODE_EXCL, | |
1957 | sb); | |
f59fce84 | 1958 | if (IS_ERR(bdev)) { |
a9dd53ad GP |
1959 | if (bdev == ERR_PTR(-EBUSY)) { |
1960 | bdev = lookup_bdev(strim(path)); | |
789d21db | 1961 | mutex_lock(&bch_register_lock); |
a9dd53ad GP |
1962 | if (!IS_ERR(bdev) && bch_is_open(bdev)) |
1963 | err = "device already registered"; | |
1964 | else | |
1965 | err = "device busy"; | |
789d21db | 1966 | mutex_unlock(&bch_register_lock); |
d7076f21 GP |
1967 | if (attr == &ksysfs_register_quiet) |
1968 | goto out; | |
a9dd53ad | 1969 | } |
cafe5635 | 1970 | goto err; |
f59fce84 KO |
1971 | } |
1972 | ||
1973 | err = "failed to set blocksize"; | |
1974 | if (set_blocksize(bdev, 4096)) | |
1975 | goto err_close; | |
cafe5635 KO |
1976 | |
1977 | err = read_super(sb, bdev, &sb_page); | |
1978 | if (err) | |
1979 | goto err_close; | |
1980 | ||
2903381f | 1981 | if (SB_IS_BDEV(sb)) { |
cafe5635 | 1982 | struct cached_dev *dc = kzalloc(sizeof(*dc), GFP_KERNEL); |
f59fce84 KO |
1983 | if (!dc) |
1984 | goto err_close; | |
cafe5635 | 1985 | |
4fa03402 | 1986 | mutex_lock(&bch_register_lock); |
f59fce84 | 1987 | register_bdev(sb, sb_page, bdev, dc); |
4fa03402 | 1988 | mutex_unlock(&bch_register_lock); |
cafe5635 KO |
1989 | } else { |
1990 | struct cache *ca = kzalloc(sizeof(*ca), GFP_KERNEL); | |
f59fce84 KO |
1991 | if (!ca) |
1992 | goto err_close; | |
cafe5635 | 1993 | |
9b299728 EW |
1994 | if (register_cache(sb, sb_page, bdev, ca) != 0) |
1995 | goto err_close; | |
cafe5635 | 1996 | } |
f59fce84 KO |
1997 | out: |
1998 | if (sb_page) | |
cafe5635 | 1999 | put_page(sb_page); |
cafe5635 KO |
2000 | kfree(sb); |
2001 | kfree(path); | |
cafe5635 KO |
2002 | module_put(THIS_MODULE); |
2003 | return ret; | |
f59fce84 KO |
2004 | |
2005 | err_close: | |
2006 | blkdev_put(bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL); | |
2007 | err: | |
d7076f21 | 2008 | pr_info("error opening %s: %s", path, err); |
f59fce84 KO |
2009 | ret = -EINVAL; |
2010 | goto out; | |
cafe5635 KO |
2011 | } |
2012 | ||
2013 | static int bcache_reboot(struct notifier_block *n, unsigned long code, void *x) | |
2014 | { | |
2015 | if (code == SYS_DOWN || | |
2016 | code == SYS_HALT || | |
2017 | code == SYS_POWER_OFF) { | |
2018 | DEFINE_WAIT(wait); | |
2019 | unsigned long start = jiffies; | |
2020 | bool stopped = false; | |
2021 | ||
2022 | struct cache_set *c, *tc; | |
2023 | struct cached_dev *dc, *tdc; | |
2024 | ||
2025 | mutex_lock(&bch_register_lock); | |
2026 | ||
2027 | if (list_empty(&bch_cache_sets) && | |
2028 | list_empty(&uncached_devices)) | |
2029 | goto out; | |
2030 | ||
2031 | pr_info("Stopping all devices:"); | |
2032 | ||
2033 | list_for_each_entry_safe(c, tc, &bch_cache_sets, list) | |
2034 | bch_cache_set_stop(c); | |
2035 | ||
2036 | list_for_each_entry_safe(dc, tdc, &uncached_devices, list) | |
2037 | bcache_device_stop(&dc->disk); | |
2038 | ||
2039 | /* What's a condition variable? */ | |
2040 | while (1) { | |
2041 | long timeout = start + 2 * HZ - jiffies; | |
2042 | ||
2043 | stopped = list_empty(&bch_cache_sets) && | |
2044 | list_empty(&uncached_devices); | |
2045 | ||
2046 | if (timeout < 0 || stopped) | |
2047 | break; | |
2048 | ||
2049 | prepare_to_wait(&unregister_wait, &wait, | |
2050 | TASK_UNINTERRUPTIBLE); | |
2051 | ||
2052 | mutex_unlock(&bch_register_lock); | |
2053 | schedule_timeout(timeout); | |
2054 | mutex_lock(&bch_register_lock); | |
2055 | } | |
2056 | ||
2057 | finish_wait(&unregister_wait, &wait); | |
2058 | ||
2059 | if (stopped) | |
2060 | pr_info("All devices stopped"); | |
2061 | else | |
2062 | pr_notice("Timeout waiting for devices to be closed"); | |
2063 | out: | |
2064 | mutex_unlock(&bch_register_lock); | |
2065 | } | |
2066 | ||
2067 | return NOTIFY_DONE; | |
2068 | } | |
2069 | ||
2070 | static struct notifier_block reboot = { | |
2071 | .notifier_call = bcache_reboot, | |
2072 | .priority = INT_MAX, /* before any real devices */ | |
2073 | }; | |
2074 | ||
2075 | static void bcache_exit(void) | |
2076 | { | |
2077 | bch_debug_exit(); | |
cafe5635 | 2078 | bch_request_exit(); |
cafe5635 KO |
2079 | if (bcache_kobj) |
2080 | kobject_put(bcache_kobj); | |
2081 | if (bcache_wq) | |
2082 | destroy_workqueue(bcache_wq); | |
5c41c8a7 KO |
2083 | if (bcache_major) |
2084 | unregister_blkdev(bcache_major, "bcache"); | |
cafe5635 KO |
2085 | unregister_reboot_notifier(&reboot); |
2086 | } | |
2087 | ||
2088 | static int __init bcache_init(void) | |
2089 | { | |
2090 | static const struct attribute *files[] = { | |
2091 | &ksysfs_register.attr, | |
2092 | &ksysfs_register_quiet.attr, | |
2093 | NULL | |
2094 | }; | |
2095 | ||
2096 | mutex_init(&bch_register_lock); | |
2097 | init_waitqueue_head(&unregister_wait); | |
2098 | register_reboot_notifier(&reboot); | |
07e86ccb | 2099 | closure_debug_init(); |
cafe5635 KO |
2100 | |
2101 | bcache_major = register_blkdev(0, "bcache"); | |
2ecf0cdb ZL |
2102 | if (bcache_major < 0) { |
2103 | unregister_reboot_notifier(&reboot); | |
cafe5635 | 2104 | return bcache_major; |
2ecf0cdb | 2105 | } |
cafe5635 | 2106 | |
81baf90a | 2107 | if (!(bcache_wq = alloc_workqueue("bcache", WQ_MEM_RECLAIM, 0)) || |
cafe5635 KO |
2108 | !(bcache_kobj = kobject_create_and_add("bcache", fs_kobj)) || |
2109 | sysfs_create_files(bcache_kobj, files) || | |
cafe5635 | 2110 | bch_request_init() || |
cafe5635 KO |
2111 | bch_debug_init(bcache_kobj)) |
2112 | goto err; | |
2113 | ||
2114 | return 0; | |
2115 | err: | |
2116 | bcache_exit(); | |
2117 | return -ENOMEM; | |
2118 | } | |
2119 | ||
2120 | module_exit(bcache_exit); | |
2121 | module_init(bcache_init); |