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
bch_print_cache_set_feature_compat(struct cache_set * c,char * buf,int size)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
bch_print_cache_set_feature_ro_compat(struct cache_set * c,char * buf,int size)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
bch_print_cache_set_feature_incompat(struct cache_set * c,char * buf,int size)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