fs/smb/client/fscache.h

Source file repositories/reference/linux-study-clean/fs/smb/client/fscache.h

File Facts

System
Linux kernel
Corpus path
fs/smb/client/fscache.h
Extension
.h
Size
3334 bytes
Lines
107
Domain
Core OS
Bucket
VFS And Filesystem Core
Inferred role
Core OS: implementation source
Status
source implementation candidate

Why This File Exists

Core operating-system implementation surface: boot, tasks, memory, VFS, syscall-facing interfaces, synchronization, credentials, and isolation.

Dependency Surface

Detected Declarations

Annotated Snippet

struct cifs_fscache_volume_coherency_data {
	__le64	resource_id;		/* unique server resource id */
	__le64	vol_create_time;
	__le32	vol_serial_number;
} __packed;

/*
 * Coherency data attached to CIFS inode within the cache.
 */
struct cifs_fscache_inode_coherency_data {
	__le64 last_write_time_sec;
	__le64 last_change_time_sec;
	__le32 last_write_time_nsec;
	__le32 last_change_time_nsec;
};

#ifdef CONFIG_CIFS_FSCACHE

/*
 * fscache.c
 */
int cifs_fscache_get_super_cookie(struct cifs_tcon *tcon);
void cifs_fscache_release_super_cookie(struct cifs_tcon *tcon);
void cifs_fscache_get_inode_cookie(struct inode *inode);
void cifs_fscache_unuse_inode_cookie(struct inode *inode, bool update);
void cifs_fscache_release_inode_cookie(struct inode *inode);
int cifs_fscache_get_super_cookie(struct cifs_tcon *tcon);
void cifs_fscache_release_super_cookie(struct cifs_tcon *tcon);

void cifs_fscache_get_inode_cookie(struct inode *inode);
void cifs_fscache_release_inode_cookie(struct inode *inode);
void cifs_fscache_unuse_inode_cookie(struct inode *inode, bool update);

static inline
void cifs_fscache_fill_coherency(struct inode *inode,
				 struct cifs_fscache_inode_coherency_data *cd)
{
	struct timespec64 ctime = inode_get_ctime(inode);
	struct timespec64 mtime = inode_get_mtime(inode);

	memset(cd, 0, sizeof(*cd));
	cd->last_write_time_sec   = cpu_to_le64(mtime.tv_sec);
	cd->last_write_time_nsec  = cpu_to_le32(mtime.tv_nsec);
	cd->last_change_time_sec  = cpu_to_le64(ctime.tv_sec);
	cd->last_change_time_nsec = cpu_to_le32(ctime.tv_nsec);
}


static inline struct fscache_cookie *cifs_inode_cookie(struct inode *inode)
{
	return netfs_i_cookie(&CIFS_I(inode)->netfs);
}

static inline void cifs_invalidate_cache(struct inode *inode, unsigned int flags)
{
	struct cifs_fscache_inode_coherency_data cd;

	cifs_fscache_fill_coherency(inode, &cd);
	fscache_invalidate(cifs_inode_cookie(inode), &cd,
			   i_size_read(inode), flags);
}

static inline bool cifs_fscache_enabled(struct inode *inode)
{
	return fscache_cookie_enabled(cifs_inode_cookie(inode));
}

#else /* CONFIG_CIFS_FSCACHE */
static inline
void cifs_fscache_fill_coherency(struct inode *inode,
				 struct cifs_fscache_inode_coherency_data *cd)
{
}

static inline int cifs_fscache_get_super_cookie(struct cifs_tcon *tcon) { return 0; }
static inline void cifs_fscache_release_super_cookie(struct cifs_tcon *tcon) {}

static inline void cifs_fscache_get_inode_cookie(struct inode *inode) {}
static inline void cifs_fscache_release_inode_cookie(struct inode *inode) {}
static inline void cifs_fscache_unuse_inode_cookie(struct inode *inode, bool update) {}
static inline struct fscache_cookie *cifs_inode_cookie(struct inode *inode) { return NULL; }
static inline void cifs_invalidate_cache(struct inode *inode, unsigned int flags) {}
static inline bool cifs_fscache_enabled(struct inode *inode) { return false; }

#endif /* CONFIG_CIFS_FSCACHE */

#endif /* _CIFS_FSCACHE_H */

Annotation

Implementation Notes