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 | */ |
9 | #include "bcache_ondisk.h" |
10 | #include "bcache.h" |
11 | #include "features.h" |
12 | |
13 | struct feature { |
14 | int compat; |
15 | unsigned int mask; |
16 | const char *string; |
17 | }; |
18 | |
19 | static struct feature feature_list[] = { |
20 | {BCH_FEATURE_INCOMPAT, BCH_FEATURE_INCOMPAT_LOG_LARGE_BUCKET_SIZE, |
21 | "large_bucket" }, |
22 | {0, 0, NULL }, |
23 | }; |
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; \ |
33 | if (BCH_HAS_ ## type ## _FEATURE(&c->cache->sb, f->mask)) { \ |
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 | \ |
47 | if (BCH_HAS_ ## type ## _FEATURE(&c->cache->sb, f->mask)) \ |
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 | } |
76 | |