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ffa47032 CL |
1 | // SPDX-License-Identifier: GPL-2.0 |
2 | /* | |
3 | * Feature set bits and string conversion. | |
4 | * Inspired by ext4's features compat/incompat/ro_compat related code. | |
5 | * | |
6 | * Copyright 2020 Coly Li <colyli@suse.de> | |
7 | * | |
8 | */ | |
cf2197ca | 9 | #include "bcache_ondisk.h" |
ffa47032 | 10 | #include "bcache.h" |
092bd54d | 11 | #include "features.h" |
ffa47032 CL |
12 | |
13 | struct feature { | |
14 | int compat; | |
15 | unsigned int mask; | |
16 | const char *string; | |
17 | }; | |
18 | ||
19 | static struct feature feature_list[] = { | |
b16671e8 | 20 | {BCH_FEATURE_INCOMPAT, BCH_FEATURE_INCOMPAT_LOG_LARGE_BUCKET_SIZE, |
ffa47032 | 21 | "large_bucket"}, |
f9a018e8 | 22 | {0, 0, NULL }, |
ffa47032 | 23 | }; |
092bd54d CL |
24 | |
25 | #define compose_feature_string(type) \ | |
26 | ({ \ | |
27 | struct feature *f; \ | |
28 | bool first = true; \ | |
29 | \ | |
30 | for (f = &feature_list[0]; f->compat != 0; f++) { \ | |
31 | if (f->compat != BCH_FEATURE_ ## type) \ | |
32 | continue; \ | |
4a784266 | 33 | if (BCH_HAS_ ## type ## _FEATURE(&c->cache->sb, f->mask)) { \ |
092bd54d CL |
34 | if (first) { \ |
35 | out += snprintf(out, buf + size - out, \ | |
36 | "["); \ | |
37 | } else { \ | |
38 | out += snprintf(out, buf + size - out, \ | |
39 | " ["); \ | |
40 | } \ | |
41 | } else if (!first) { \ | |
42 | out += snprintf(out, buf + size - out, " "); \ | |
43 | } \ | |
44 | \ | |
45 | out += snprintf(out, buf + size - out, "%s", f->string);\ | |
46 | \ | |
4a784266 | 47 | if (BCH_HAS_ ## type ## _FEATURE(&c->cache->sb, f->mask)) \ |
092bd54d CL |
48 | out += snprintf(out, buf + size - out, "]"); \ |
49 | \ | |
50 | first = false; \ | |
51 | } \ | |
52 | if (!first) \ | |
53 | out += snprintf(out, buf + size - out, "\n"); \ | |
54 | }) | |
55 | ||
56 | int bch_print_cache_set_feature_compat(struct cache_set *c, char *buf, int size) | |
57 | { | |
58 | char *out = buf; | |
59 | compose_feature_string(COMPAT); | |
60 | return out - buf; | |
61 | } | |
62 | ||
63 | int bch_print_cache_set_feature_ro_compat(struct cache_set *c, char *buf, int size) | |
64 | { | |
65 | char *out = buf; | |
66 | compose_feature_string(RO_COMPAT); | |
67 | return out - buf; | |
68 | } | |
69 | ||
70 | int bch_print_cache_set_feature_incompat(struct cache_set *c, char *buf, int size) | |
71 | { | |
72 | char *out = buf; | |
73 | compose_feature_string(INCOMPAT); | |
74 | return out - buf; | |
75 | } |