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