1/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
2#ifndef _BCACHE_FEATURES_H
3#define _BCACHE_FEATURES_H
4
5#include <linux/kernel.h>
6#include <linux/types.h>
7
8#include "bcache_ondisk.h"
9
10#define BCH_FEATURE_COMPAT		0
11#define BCH_FEATURE_RO_COMPAT		1
12#define BCH_FEATURE_INCOMPAT		2
13#define BCH_FEATURE_TYPE_MASK		0x03
14
15/* Feature set definition */
16/* Incompat feature set */
17/* 32bit bucket size, obsoleted */
18#define BCH_FEATURE_INCOMPAT_OBSO_LARGE_BUCKET		0x0001
19/* real bucket size is (1 << bucket_size) */
20#define BCH_FEATURE_INCOMPAT_LOG_LARGE_BUCKET_SIZE	0x0002
21
22#define BCH_FEATURE_COMPAT_SUPP		0
23#define BCH_FEATURE_RO_COMPAT_SUPP	0
24#define BCH_FEATURE_INCOMPAT_SUPP	(BCH_FEATURE_INCOMPAT_OBSO_LARGE_BUCKET| \
25					 BCH_FEATURE_INCOMPAT_LOG_LARGE_BUCKET_SIZE)
26
27#define BCH_HAS_COMPAT_FEATURE(sb, mask) \
28		((sb)->feature_compat & (mask))
29#define BCH_HAS_RO_COMPAT_FEATURE(sb, mask) \
30		((sb)->feature_ro_compat & (mask))
31#define BCH_HAS_INCOMPAT_FEATURE(sb, mask) \
32		((sb)->feature_incompat & (mask))
33
34#define BCH_FEATURE_COMPAT_FUNCS(name, flagname) \
35static inline int bch_has_feature_##name(struct cache_sb *sb) \
36{ \
37	if (sb->version < BCACHE_SB_VERSION_CDEV_WITH_FEATURES) \
38		return 0; \
39	return (((sb)->feature_compat & \
40		BCH##_FEATURE_COMPAT_##flagname) != 0); \
41} \
42static inline void bch_set_feature_##name(struct cache_sb *sb) \
43{ \
44	(sb)->feature_compat |= \
45		BCH##_FEATURE_COMPAT_##flagname; \
46} \
47static inline void bch_clear_feature_##name(struct cache_sb *sb) \
48{ \
49	(sb)->feature_compat &= \
50		~BCH##_FEATURE_COMPAT_##flagname; \
51}
52
53#define BCH_FEATURE_RO_COMPAT_FUNCS(name, flagname) \
54static inline int bch_has_feature_##name(struct cache_sb *sb) \
55{ \
56	if (sb->version < BCACHE_SB_VERSION_CDEV_WITH_FEATURES) \
57		return 0; \
58	return (((sb)->feature_ro_compat & \
59		BCH##_FEATURE_RO_COMPAT_##flagname) != 0); \
60} \
61static inline void bch_set_feature_##name(struct cache_sb *sb) \
62{ \
63	(sb)->feature_ro_compat |= \
64		BCH##_FEATURE_RO_COMPAT_##flagname; \
65} \
66static inline void bch_clear_feature_##name(struct cache_sb *sb) \
67{ \
68	(sb)->feature_ro_compat &= \
69		~BCH##_FEATURE_RO_COMPAT_##flagname; \
70}
71
72#define BCH_FEATURE_INCOMPAT_FUNCS(name, flagname) \
73static inline int bch_has_feature_##name(struct cache_sb *sb) \
74{ \
75	if (sb->version < BCACHE_SB_VERSION_CDEV_WITH_FEATURES) \
76		return 0; \
77	return (((sb)->feature_incompat & \
78		BCH##_FEATURE_INCOMPAT_##flagname) != 0); \
79} \
80static inline void bch_set_feature_##name(struct cache_sb *sb) \
81{ \
82	(sb)->feature_incompat |= \
83		BCH##_FEATURE_INCOMPAT_##flagname; \
84} \
85static inline void bch_clear_feature_##name(struct cache_sb *sb) \
86{ \
87	(sb)->feature_incompat &= \
88		~BCH##_FEATURE_INCOMPAT_##flagname; \
89}
90
91BCH_FEATURE_INCOMPAT_FUNCS(obso_large_bucket, OBSO_LARGE_BUCKET);
92BCH_FEATURE_INCOMPAT_FUNCS(large_bucket, LOG_LARGE_BUCKET_SIZE);
93
94static inline bool bch_has_unknown_compat_features(struct cache_sb *sb)
95{
96	return ((sb->feature_compat & ~BCH_FEATURE_COMPAT_SUPP) != 0);
97}
98
99static inline bool bch_has_unknown_ro_compat_features(struct cache_sb *sb)
100{
101	return ((sb->feature_ro_compat & ~BCH_FEATURE_RO_COMPAT_SUPP) != 0);
102}
103
104static inline bool bch_has_unknown_incompat_features(struct cache_sb *sb)
105{
106	return ((sb->feature_incompat & ~BCH_FEATURE_INCOMPAT_SUPP) != 0);
107}
108
109int bch_print_cache_set_feature_compat(struct cache_set *c, char *buf, int size);
110int bch_print_cache_set_feature_ro_compat(struct cache_set *c, char *buf, int size);
111int bch_print_cache_set_feature_incompat(struct cache_set *c, char *buf, int size);
112
113#endif
114