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