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Commit | Line | Data |
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cafe5635 KO |
1 | /* |
2 | * Moving/copying garbage collector | |
3 | * | |
4 | * Copyright 2012 Google, Inc. | |
5 | */ | |
6 | ||
7 | #include "bcache.h" | |
8 | #include "btree.h" | |
9 | #include "debug.h" | |
10 | #include "request.h" | |
11 | ||
c37511b8 KO |
12 | #include <trace/events/bcache.h> |
13 | ||
cafe5635 | 14 | struct moving_io { |
220bb38c | 15 | struct closure cl; |
cafe5635 | 16 | struct keybuf_key *w; |
220bb38c | 17 | struct data_insert_op op; |
cafe5635 KO |
18 | struct bbio bio; |
19 | }; | |
20 | ||
21 | static bool moving_pred(struct keybuf *buf, struct bkey *k) | |
22 | { | |
23 | struct cache_set *c = container_of(buf, struct cache_set, | |
24 | moving_gc_keys); | |
25 | unsigned i; | |
26 | ||
10d9dcf6 KO |
27 | for (i = 0; i < KEY_PTRS(k); i++) |
28 | if (ptr_available(c, k, i) && | |
29 | GC_MOVE(PTR_BUCKET(c, k, i))) | |
cafe5635 | 30 | return true; |
cafe5635 KO |
31 | |
32 | return false; | |
33 | } | |
34 | ||
35 | /* Moving GC - IO loop */ | |
36 | ||
37 | static void moving_io_destructor(struct closure *cl) | |
38 | { | |
220bb38c | 39 | struct moving_io *io = container_of(cl, struct moving_io, cl); |
cafe5635 KO |
40 | kfree(io); |
41 | } | |
42 | ||
43 | static void write_moving_finish(struct closure *cl) | |
44 | { | |
220bb38c | 45 | struct moving_io *io = container_of(cl, struct moving_io, cl); |
cafe5635 | 46 | struct bio *bio = &io->bio.bio; |
cafe5635 | 47 | |
491221f8 | 48 | bio_free_pages(bio); |
cafe5635 | 49 | |
220bb38c | 50 | if (io->op.replace_collision) |
c37511b8 | 51 | trace_bcache_gc_copy_collision(&io->w->key); |
cafe5635 | 52 | |
220bb38c | 53 | bch_keybuf_del(&io->op.c->moving_gc_keys, io->w); |
cafe5635 | 54 | |
220bb38c | 55 | up(&io->op.c->moving_in_flight); |
cafe5635 KO |
56 | |
57 | closure_return_with_destructor(cl, moving_io_destructor); | |
58 | } | |
59 | ||
4246a0b6 | 60 | static void read_moving_endio(struct bio *bio) |
cafe5635 | 61 | { |
6d3d1a9c | 62 | struct bbio *b = container_of(bio, struct bbio, bio); |
cafe5635 | 63 | struct moving_io *io = container_of(bio->bi_private, |
220bb38c | 64 | struct moving_io, cl); |
cafe5635 | 65 | |
4e4cbee9 CH |
66 | if (bio->bi_status) |
67 | io->op.status = bio->bi_status; | |
6d3d1a9c KO |
68 | else if (!KEY_DIRTY(&b->key) && |
69 | ptr_stale(io->op.c, &b->key, 0)) { | |
4e4cbee9 | 70 | io->op.status = BLK_STS_IOERR; |
6d3d1a9c | 71 | } |
cafe5635 | 72 | |
4e4cbee9 | 73 | bch_bbio_endio(io->op.c, bio, bio->bi_status, "reading data to move"); |
cafe5635 KO |
74 | } |
75 | ||
76 | static void moving_init(struct moving_io *io) | |
77 | { | |
78 | struct bio *bio = &io->bio.bio; | |
79 | ||
3a83f467 ML |
80 | bio_init(bio, bio->bi_inline_vecs, |
81 | DIV_ROUND_UP(KEY_SIZE(&io->w->key), PAGE_SECTORS)); | |
cafe5635 KO |
82 | bio_get(bio); |
83 | bio_set_prio(bio, IOPRIO_PRIO_VALUE(IOPRIO_CLASS_IDLE, 0)); | |
84 | ||
4f024f37 | 85 | bio->bi_iter.bi_size = KEY_SIZE(&io->w->key) << 9; |
220bb38c | 86 | bio->bi_private = &io->cl; |
169ef1cf | 87 | bch_bio_map(bio, NULL); |
cafe5635 KO |
88 | } |
89 | ||
90 | static void write_moving(struct closure *cl) | |
91 | { | |
220bb38c KO |
92 | struct moving_io *io = container_of(cl, struct moving_io, cl); |
93 | struct data_insert_op *op = &io->op; | |
cafe5635 | 94 | |
4e4cbee9 | 95 | if (!op->status) { |
cafe5635 KO |
96 | moving_init(io); |
97 | ||
4f024f37 | 98 | io->bio.bio.bi_iter.bi_sector = KEY_START(&io->w->key); |
220bb38c KO |
99 | op->write_prio = 1; |
100 | op->bio = &io->bio.bio; | |
cafe5635 | 101 | |
220bb38c KO |
102 | op->writeback = KEY_DIRTY(&io->w->key); |
103 | op->csum = KEY_CSUM(&io->w->key); | |
cafe5635 | 104 | |
220bb38c KO |
105 | bkey_copy(&op->replace_key, &io->w->key); |
106 | op->replace = true; | |
cafe5635 | 107 | |
220bb38c | 108 | closure_call(&op->cl, bch_data_insert, NULL, cl); |
cafe5635 KO |
109 | } |
110 | ||
da415a09 | 111 | continue_at(cl, write_moving_finish, op->wq); |
cafe5635 KO |
112 | } |
113 | ||
114 | static void read_moving_submit(struct closure *cl) | |
115 | { | |
220bb38c | 116 | struct moving_io *io = container_of(cl, struct moving_io, cl); |
cafe5635 KO |
117 | struct bio *bio = &io->bio.bio; |
118 | ||
220bb38c | 119 | bch_submit_bbio(bio, io->op.c, &io->w->key, 0); |
cafe5635 | 120 | |
da415a09 | 121 | continue_at(cl, write_moving, io->op.wq); |
cafe5635 KO |
122 | } |
123 | ||
72a44517 | 124 | static void read_moving(struct cache_set *c) |
cafe5635 | 125 | { |
cafe5635 KO |
126 | struct keybuf_key *w; |
127 | struct moving_io *io; | |
128 | struct bio *bio; | |
72a44517 KO |
129 | struct closure cl; |
130 | ||
131 | closure_init_stack(&cl); | |
cafe5635 KO |
132 | |
133 | /* XXX: if we error, background writeback could stall indefinitely */ | |
134 | ||
135 | while (!test_bit(CACHE_SET_STOPPING, &c->flags)) { | |
72c27061 KO |
136 | w = bch_keybuf_next_rescan(c, &c->moving_gc_keys, |
137 | &MAX_KEY, moving_pred); | |
cafe5635 KO |
138 | if (!w) |
139 | break; | |
140 | ||
6d3d1a9c KO |
141 | if (ptr_stale(c, &w->key, 0)) { |
142 | bch_keybuf_del(&c->moving_gc_keys, w); | |
143 | continue; | |
144 | } | |
145 | ||
cafe5635 KO |
146 | io = kzalloc(sizeof(struct moving_io) + sizeof(struct bio_vec) |
147 | * DIV_ROUND_UP(KEY_SIZE(&w->key), PAGE_SECTORS), | |
148 | GFP_KERNEL); | |
149 | if (!io) | |
150 | goto err; | |
151 | ||
152 | w->private = io; | |
153 | io->w = w; | |
220bb38c KO |
154 | io->op.inode = KEY_INODE(&w->key); |
155 | io->op.c = c; | |
da415a09 | 156 | io->op.wq = c->moving_gc_wq; |
cafe5635 KO |
157 | |
158 | moving_init(io); | |
159 | bio = &io->bio.bio; | |
160 | ||
ad0d9e76 | 161 | bio_set_op_attrs(bio, REQ_OP_READ, 0); |
cafe5635 KO |
162 | bio->bi_end_io = read_moving_endio; |
163 | ||
8e51e414 | 164 | if (bio_alloc_pages(bio, GFP_KERNEL)) |
cafe5635 KO |
165 | goto err; |
166 | ||
c37511b8 | 167 | trace_bcache_gc_copy(&w->key); |
cafe5635 | 168 | |
72a44517 | 169 | down(&c->moving_in_flight); |
220bb38c | 170 | closure_call(&io->cl, read_moving_submit, NULL, &cl); |
cafe5635 KO |
171 | } |
172 | ||
173 | if (0) { | |
174 | err: if (!IS_ERR_OR_NULL(w->private)) | |
175 | kfree(w->private); | |
176 | ||
177 | bch_keybuf_del(&c->moving_gc_keys, w); | |
178 | } | |
179 | ||
72a44517 | 180 | closure_sync(&cl); |
cafe5635 KO |
181 | } |
182 | ||
b1a67b0f KO |
183 | static bool bucket_cmp(struct bucket *l, struct bucket *r) |
184 | { | |
185 | return GC_SECTORS_USED(l) < GC_SECTORS_USED(r); | |
186 | } | |
187 | ||
188 | static unsigned bucket_heap_top(struct cache *ca) | |
189 | { | |
bee63f40 NS |
190 | struct bucket *b; |
191 | return (b = heap_peek(&ca->heap)) ? GC_SECTORS_USED(b) : 0; | |
b1a67b0f KO |
192 | } |
193 | ||
72a44517 | 194 | void bch_moving_gc(struct cache_set *c) |
cafe5635 | 195 | { |
cafe5635 KO |
196 | struct cache *ca; |
197 | struct bucket *b; | |
198 | unsigned i; | |
199 | ||
cafe5635 | 200 | if (!c->copy_gc_enabled) |
72a44517 | 201 | return; |
cafe5635 KO |
202 | |
203 | mutex_lock(&c->bucket_lock); | |
204 | ||
205 | for_each_cache(ca, c, i) { | |
206 | unsigned sectors_to_move = 0; | |
207 | unsigned reserve_sectors = ca->sb.bucket_size * | |
78365411 | 208 | fifo_used(&ca->free[RESERVE_MOVINGGC]); |
cafe5635 KO |
209 | |
210 | ca->heap.used = 0; | |
211 | ||
212 | for_each_bucket(b, ca) { | |
3f6ef381 NS |
213 | if (GC_MARK(b) == GC_MARK_METADATA || |
214 | !GC_SECTORS_USED(b) || | |
215 | GC_SECTORS_USED(b) == ca->sb.bucket_size || | |
216 | atomic_read(&b->pin)) | |
cafe5635 KO |
217 | continue; |
218 | ||
219 | if (!heap_full(&ca->heap)) { | |
220 | sectors_to_move += GC_SECTORS_USED(b); | |
221 | heap_add(&ca->heap, b, bucket_cmp); | |
222 | } else if (bucket_cmp(b, heap_peek(&ca->heap))) { | |
b1a67b0f | 223 | sectors_to_move -= bucket_heap_top(ca); |
cafe5635 KO |
224 | sectors_to_move += GC_SECTORS_USED(b); |
225 | ||
226 | ca->heap.data[0] = b; | |
227 | heap_sift(&ca->heap, 0, bucket_cmp); | |
228 | } | |
229 | } | |
230 | ||
231 | while (sectors_to_move > reserve_sectors) { | |
232 | heap_pop(&ca->heap, b, bucket_cmp); | |
233 | sectors_to_move -= GC_SECTORS_USED(b); | |
234 | } | |
235 | ||
981aa8c0 NS |
236 | while (heap_pop(&ca->heap, b, bucket_cmp)) |
237 | SET_GC_MOVE(b, 1); | |
cafe5635 KO |
238 | } |
239 | ||
240 | mutex_unlock(&c->bucket_lock); | |
241 | ||
242 | c->moving_gc_keys.last_scanned = ZERO_KEY; | |
243 | ||
72a44517 | 244 | read_moving(c); |
cafe5635 KO |
245 | } |
246 | ||
247 | void bch_moving_init_cache_set(struct cache_set *c) | |
248 | { | |
72c27061 | 249 | bch_keybuf_init(&c->moving_gc_keys); |
72a44517 | 250 | sema_init(&c->moving_in_flight, 64); |
cafe5635 | 251 | } |