Commit | Line | Data |
---|---|---|
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; |
8e51e414 KO |
47 | struct bio_vec *bv; |
48 | int i; | |
cafe5635 | 49 | |
8e51e414 | 50 | bio_for_each_segment_all(bv, bio, i) |
cafe5635 KO |
51 | __free_page(bv->bv_page); |
52 | ||
220bb38c | 53 | if (io->op.replace_collision) |
c37511b8 | 54 | trace_bcache_gc_copy_collision(&io->w->key); |
cafe5635 | 55 | |
220bb38c | 56 | bch_keybuf_del(&io->op.c->moving_gc_keys, io->w); |
cafe5635 | 57 | |
220bb38c | 58 | up(&io->op.c->moving_in_flight); |
cafe5635 KO |
59 | |
60 | closure_return_with_destructor(cl, moving_io_destructor); | |
61 | } | |
62 | ||
63 | static void read_moving_endio(struct bio *bio, int error) | |
64 | { | |
6d3d1a9c | 65 | struct bbio *b = container_of(bio, struct bbio, bio); |
cafe5635 | 66 | struct moving_io *io = container_of(bio->bi_private, |
220bb38c | 67 | struct moving_io, cl); |
cafe5635 KO |
68 | |
69 | if (error) | |
220bb38c | 70 | io->op.error = error; |
6d3d1a9c KO |
71 | else if (!KEY_DIRTY(&b->key) && |
72 | ptr_stale(io->op.c, &b->key, 0)) { | |
73 | io->op.error = -EINTR; | |
74 | } | |
cafe5635 | 75 | |
220bb38c | 76 | bch_bbio_endio(io->op.c, bio, error, "reading data to move"); |
cafe5635 KO |
77 | } |
78 | ||
79 | static void moving_init(struct moving_io *io) | |
80 | { | |
81 | struct bio *bio = &io->bio.bio; | |
82 | ||
83 | bio_init(bio); | |
84 | bio_get(bio); | |
85 | bio_set_prio(bio, IOPRIO_PRIO_VALUE(IOPRIO_CLASS_IDLE, 0)); | |
86 | ||
4f024f37 | 87 | bio->bi_iter.bi_size = KEY_SIZE(&io->w->key) << 9; |
cafe5635 KO |
88 | bio->bi_max_vecs = DIV_ROUND_UP(KEY_SIZE(&io->w->key), |
89 | PAGE_SECTORS); | |
220bb38c | 90 | bio->bi_private = &io->cl; |
cafe5635 | 91 | bio->bi_io_vec = bio->bi_inline_vecs; |
169ef1cf | 92 | bch_bio_map(bio, NULL); |
cafe5635 KO |
93 | } |
94 | ||
95 | static void write_moving(struct closure *cl) | |
96 | { | |
220bb38c KO |
97 | struct moving_io *io = container_of(cl, struct moving_io, cl); |
98 | struct data_insert_op *op = &io->op; | |
cafe5635 | 99 | |
220bb38c | 100 | if (!op->error) { |
cafe5635 KO |
101 | moving_init(io); |
102 | ||
4f024f37 | 103 | io->bio.bio.bi_iter.bi_sector = KEY_START(&io->w->key); |
220bb38c KO |
104 | op->write_prio = 1; |
105 | op->bio = &io->bio.bio; | |
cafe5635 | 106 | |
220bb38c KO |
107 | op->writeback = KEY_DIRTY(&io->w->key); |
108 | op->csum = KEY_CSUM(&io->w->key); | |
cafe5635 | 109 | |
220bb38c KO |
110 | bkey_copy(&op->replace_key, &io->w->key); |
111 | op->replace = true; | |
cafe5635 | 112 | |
220bb38c | 113 | closure_call(&op->cl, bch_data_insert, NULL, cl); |
cafe5635 KO |
114 | } |
115 | ||
da415a09 | 116 | continue_at(cl, write_moving_finish, op->wq); |
cafe5635 KO |
117 | } |
118 | ||
119 | static void read_moving_submit(struct closure *cl) | |
120 | { | |
220bb38c | 121 | struct moving_io *io = container_of(cl, struct moving_io, cl); |
cafe5635 KO |
122 | struct bio *bio = &io->bio.bio; |
123 | ||
220bb38c | 124 | bch_submit_bbio(bio, io->op.c, &io->w->key, 0); |
cafe5635 | 125 | |
da415a09 | 126 | continue_at(cl, write_moving, io->op.wq); |
cafe5635 KO |
127 | } |
128 | ||
72a44517 | 129 | static void read_moving(struct cache_set *c) |
cafe5635 | 130 | { |
cafe5635 KO |
131 | struct keybuf_key *w; |
132 | struct moving_io *io; | |
133 | struct bio *bio; | |
72a44517 KO |
134 | struct closure cl; |
135 | ||
136 | closure_init_stack(&cl); | |
cafe5635 KO |
137 | |
138 | /* XXX: if we error, background writeback could stall indefinitely */ | |
139 | ||
140 | while (!test_bit(CACHE_SET_STOPPING, &c->flags)) { | |
72c27061 KO |
141 | w = bch_keybuf_next_rescan(c, &c->moving_gc_keys, |
142 | &MAX_KEY, moving_pred); | |
cafe5635 KO |
143 | if (!w) |
144 | break; | |
145 | ||
6d3d1a9c KO |
146 | if (ptr_stale(c, &w->key, 0)) { |
147 | bch_keybuf_del(&c->moving_gc_keys, w); | |
148 | continue; | |
149 | } | |
150 | ||
cafe5635 KO |
151 | io = kzalloc(sizeof(struct moving_io) + sizeof(struct bio_vec) |
152 | * DIV_ROUND_UP(KEY_SIZE(&w->key), PAGE_SECTORS), | |
153 | GFP_KERNEL); | |
154 | if (!io) | |
155 | goto err; | |
156 | ||
157 | w->private = io; | |
158 | io->w = w; | |
220bb38c KO |
159 | io->op.inode = KEY_INODE(&w->key); |
160 | io->op.c = c; | |
da415a09 | 161 | io->op.wq = c->moving_gc_wq; |
cafe5635 KO |
162 | |
163 | moving_init(io); | |
164 | bio = &io->bio.bio; | |
165 | ||
166 | bio->bi_rw = READ; | |
167 | bio->bi_end_io = read_moving_endio; | |
168 | ||
8e51e414 | 169 | if (bio_alloc_pages(bio, GFP_KERNEL)) |
cafe5635 KO |
170 | goto err; |
171 | ||
c37511b8 | 172 | trace_bcache_gc_copy(&w->key); |
cafe5635 | 173 | |
72a44517 | 174 | down(&c->moving_in_flight); |
220bb38c | 175 | closure_call(&io->cl, read_moving_submit, NULL, &cl); |
cafe5635 KO |
176 | } |
177 | ||
178 | if (0) { | |
179 | err: if (!IS_ERR_OR_NULL(w->private)) | |
180 | kfree(w->private); | |
181 | ||
182 | bch_keybuf_del(&c->moving_gc_keys, w); | |
183 | } | |
184 | ||
72a44517 | 185 | closure_sync(&cl); |
cafe5635 KO |
186 | } |
187 | ||
b1a67b0f KO |
188 | static bool bucket_cmp(struct bucket *l, struct bucket *r) |
189 | { | |
190 | return GC_SECTORS_USED(l) < GC_SECTORS_USED(r); | |
191 | } | |
192 | ||
193 | static unsigned bucket_heap_top(struct cache *ca) | |
194 | { | |
bee63f40 NS |
195 | struct bucket *b; |
196 | return (b = heap_peek(&ca->heap)) ? GC_SECTORS_USED(b) : 0; | |
b1a67b0f KO |
197 | } |
198 | ||
72a44517 | 199 | void bch_moving_gc(struct cache_set *c) |
cafe5635 | 200 | { |
cafe5635 KO |
201 | struct cache *ca; |
202 | struct bucket *b; | |
203 | unsigned i; | |
204 | ||
cafe5635 | 205 | if (!c->copy_gc_enabled) |
72a44517 | 206 | return; |
cafe5635 KO |
207 | |
208 | mutex_lock(&c->bucket_lock); | |
209 | ||
210 | for_each_cache(ca, c, i) { | |
211 | unsigned sectors_to_move = 0; | |
212 | unsigned reserve_sectors = ca->sb.bucket_size * | |
78365411 | 213 | fifo_used(&ca->free[RESERVE_MOVINGGC]); |
cafe5635 KO |
214 | |
215 | ca->heap.used = 0; | |
216 | ||
217 | for_each_bucket(b, ca) { | |
3f6ef381 NS |
218 | if (GC_MARK(b) == GC_MARK_METADATA || |
219 | !GC_SECTORS_USED(b) || | |
220 | GC_SECTORS_USED(b) == ca->sb.bucket_size || | |
221 | atomic_read(&b->pin)) | |
cafe5635 KO |
222 | continue; |
223 | ||
224 | if (!heap_full(&ca->heap)) { | |
225 | sectors_to_move += GC_SECTORS_USED(b); | |
226 | heap_add(&ca->heap, b, bucket_cmp); | |
227 | } else if (bucket_cmp(b, heap_peek(&ca->heap))) { | |
b1a67b0f | 228 | sectors_to_move -= bucket_heap_top(ca); |
cafe5635 KO |
229 | sectors_to_move += GC_SECTORS_USED(b); |
230 | ||
231 | ca->heap.data[0] = b; | |
232 | heap_sift(&ca->heap, 0, bucket_cmp); | |
233 | } | |
234 | } | |
235 | ||
236 | while (sectors_to_move > reserve_sectors) { | |
237 | heap_pop(&ca->heap, b, bucket_cmp); | |
238 | sectors_to_move -= GC_SECTORS_USED(b); | |
239 | } | |
240 | ||
981aa8c0 NS |
241 | while (heap_pop(&ca->heap, b, bucket_cmp)) |
242 | SET_GC_MOVE(b, 1); | |
cafe5635 KO |
243 | } |
244 | ||
245 | mutex_unlock(&c->bucket_lock); | |
246 | ||
247 | c->moving_gc_keys.last_scanned = ZERO_KEY; | |
248 | ||
72a44517 | 249 | read_moving(c); |
cafe5635 KO |
250 | } |
251 | ||
252 | void bch_moving_init_cache_set(struct cache_set *c) | |
253 | { | |
72c27061 | 254 | bch_keybuf_init(&c->moving_gc_keys); |
72a44517 | 255 | sema_init(&c->moving_in_flight, 64); |
cafe5635 | 256 | } |