drivers/md/bcache/features.h

Source file repositories/reference/linux-study-clean/drivers/md/bcache/features.h

File Facts

System
Linux kernel
Corpus path
drivers/md/bcache/features.h
Extension
.h
Size
3539 bytes
Lines
114
Domain
Driver Families
Bucket
drivers/md
Inferred role
Driver Families: implementation source
Status
source implementation candidate

Why This File Exists

Repeatable hardware-adapter layer. Deep compatibility for every driver is out of scope; this atlas records patterns, probe lifecycles, bus glue, IRQ/DMA usage, and links back to core abstractions.

Dependency Surface

Detected Declarations

Annotated Snippet

#ifndef _BCACHE_FEATURES_H
#define _BCACHE_FEATURES_H

#include <linux/kernel.h>
#include <linux/types.h>

#include "bcache_ondisk.h"

#define BCH_FEATURE_COMPAT		0
#define BCH_FEATURE_RO_COMPAT		1
#define BCH_FEATURE_INCOMPAT		2
#define BCH_FEATURE_TYPE_MASK		0x03

/* Feature set definition */
/* Incompat feature set */
/* 32bit bucket size, obsoleted */
#define BCH_FEATURE_INCOMPAT_OBSO_LARGE_BUCKET		0x0001
/* real bucket size is (1 << bucket_size) */
#define BCH_FEATURE_INCOMPAT_LOG_LARGE_BUCKET_SIZE	0x0002

#define BCH_FEATURE_COMPAT_SUPP		0
#define BCH_FEATURE_RO_COMPAT_SUPP	0
#define BCH_FEATURE_INCOMPAT_SUPP	(BCH_FEATURE_INCOMPAT_OBSO_LARGE_BUCKET| \
					 BCH_FEATURE_INCOMPAT_LOG_LARGE_BUCKET_SIZE)

#define BCH_HAS_COMPAT_FEATURE(sb, mask) \
		((sb)->feature_compat & (mask))
#define BCH_HAS_RO_COMPAT_FEATURE(sb, mask) \
		((sb)->feature_ro_compat & (mask))
#define BCH_HAS_INCOMPAT_FEATURE(sb, mask) \
		((sb)->feature_incompat & (mask))

#define BCH_FEATURE_COMPAT_FUNCS(name, flagname) \
static inline int bch_has_feature_##name(struct cache_sb *sb) \
{ \
	if (sb->version < BCACHE_SB_VERSION_CDEV_WITH_FEATURES) \
		return 0; \
	return (((sb)->feature_compat & \
		BCH##_FEATURE_COMPAT_##flagname) != 0); \
} \
static inline void bch_set_feature_##name(struct cache_sb *sb) \
{ \
	(sb)->feature_compat |= \
		BCH##_FEATURE_COMPAT_##flagname; \
} \
static inline void bch_clear_feature_##name(struct cache_sb *sb) \
{ \
	(sb)->feature_compat &= \
		~BCH##_FEATURE_COMPAT_##flagname; \
}

#define BCH_FEATURE_RO_COMPAT_FUNCS(name, flagname) \
static inline int bch_has_feature_##name(struct cache_sb *sb) \
{ \
	if (sb->version < BCACHE_SB_VERSION_CDEV_WITH_FEATURES) \
		return 0; \
	return (((sb)->feature_ro_compat & \
		BCH##_FEATURE_RO_COMPAT_##flagname) != 0); \
} \
static inline void bch_set_feature_##name(struct cache_sb *sb) \
{ \
	(sb)->feature_ro_compat |= \
		BCH##_FEATURE_RO_COMPAT_##flagname; \
} \
static inline void bch_clear_feature_##name(struct cache_sb *sb) \
{ \
	(sb)->feature_ro_compat &= \
		~BCH##_FEATURE_RO_COMPAT_##flagname; \
}

#define BCH_FEATURE_INCOMPAT_FUNCS(name, flagname) \
static inline int bch_has_feature_##name(struct cache_sb *sb) \
{ \
	if (sb->version < BCACHE_SB_VERSION_CDEV_WITH_FEATURES) \
		return 0; \
	return (((sb)->feature_incompat & \
		BCH##_FEATURE_INCOMPAT_##flagname) != 0); \
} \
static inline void bch_set_feature_##name(struct cache_sb *sb) \
{ \
	(sb)->feature_incompat |= \
		BCH##_FEATURE_INCOMPAT_##flagname; \
} \
static inline void bch_clear_feature_##name(struct cache_sb *sb) \
{ \
	(sb)->feature_incompat &= \
		~BCH##_FEATURE_INCOMPAT_##flagname; \
}

BCH_FEATURE_INCOMPAT_FUNCS(obso_large_bucket, OBSO_LARGE_BUCKET);

Annotation

Implementation Notes