blob: 634922c5601db7d9f836ea1a49568db1b9876861 [file] [log] [blame]
Coly Liffa47032020-07-25 20:00:35 +08001// 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 */
Coly Licf2197c2021-10-29 14:09:29 +08009#include "bcache_ondisk.h"
Coly Liffa47032020-07-25 20:00:35 +080010#include "bcache.h"
Coly Li092bd542020-07-25 20:00:36 +080011#include "features.h"
Coly Liffa47032020-07-25 20:00:35 +080012
13struct feature {
14 int compat;
15 unsigned int mask;
16 const char *string;
17};
18
19static struct feature feature_list[] = {
Coly Lib16671e2021-01-04 15:41:21 +080020 {BCH_FEATURE_INCOMPAT, BCH_FEATURE_INCOMPAT_LOG_LARGE_BUCKET_SIZE,
Coly Liffa47032020-07-25 20:00:35 +080021 "large_bucket"},
Yang Lif9a018e2021-04-11 21:43:12 +080022 {0, 0, NULL },
Coly Liffa47032020-07-25 20:00:35 +080023};
Coly Li092bd542020-07-25 20:00:36 +080024
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; \
Coly Li4a784262020-10-01 14:50:56 +080033 if (BCH_HAS_ ## type ## _FEATURE(&c->cache->sb, f->mask)) { \
Coly Li092bd542020-07-25 20:00:36 +080034 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 \
Coly Li4a784262020-10-01 14:50:56 +080047 if (BCH_HAS_ ## type ## _FEATURE(&c->cache->sb, f->mask)) \
Coly Li092bd542020-07-25 20:00:36 +080048 out += snprintf(out, buf + size - out, "]"); \
49 \
50 first = false; \
51 } \
52 if (!first) \
53 out += snprintf(out, buf + size - out, "\n"); \
54})
55
56int 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
63int 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
70int 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}