fs/jffs2/xattr.h

Source file repositories/reference/linux-study-clean/fs/jffs2/xattr.h

File Facts

System
Linux kernel
Corpus path
fs/jffs2/xattr.h
Extension
.h
Size
4209 bytes
Lines
128
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

#ifndef _JFFS2_FS_XATTR_H_
#define _JFFS2_FS_XATTR_H_

#include <linux/xattr.h>
#include <linux/list.h>

#define JFFS2_XFLAGS_HOT	(0x01)	/* This datum is HOT */
#define JFFS2_XFLAGS_BIND	(0x02)	/* This datum is not reclaimed */
#define JFFS2_XFLAGS_DEAD	(0x40)	/* This datum is already dead */
#define JFFS2_XFLAGS_INVALID	(0x80)	/* This datum contains crc error */

struct jffs2_xattr_datum
{
	void *always_null;
	struct jffs2_raw_node_ref *node;
	uint8_t class;
	uint8_t flags;
	uint16_t xprefix;		/* see JFFS2_XATTR_PREFIX_* */

	struct list_head xindex;	/* chained from c->xattrindex[n] */
	atomic_t refcnt;		/* # of xattr_ref refers this */
	uint32_t xid;
	uint32_t version;

	uint32_t data_crc;
	uint32_t hashkey;
	char *xname;		/* XATTR name without prefix */
	uint32_t name_len;	/* length of xname */
	char *xvalue;		/* XATTR value */
	uint32_t value_len;	/* length of xvalue */
};

struct jffs2_inode_cache;
struct jffs2_xattr_ref
{
	void *always_null;
	struct jffs2_raw_node_ref *node;
	uint8_t class;
	uint8_t flags;		/* Currently unused */
	u16 unused;

	uint32_t xseqno;
	union {
		struct jffs2_inode_cache *ic;	/* reference to jffs2_inode_cache */
		uint32_t ino;			/* only used in scanning/building  */
	};
	union {
		struct jffs2_xattr_datum *xd;	/* reference to jffs2_xattr_datum */
		uint32_t xid;			/* only used in sccanning/building */
	};
	struct jffs2_xattr_ref *next;		/* chained from ic->xref_list */
};

#define XREF_DELETE_MARKER	(0x00000001)
static inline int is_xattr_ref_dead(struct jffs2_xattr_ref *ref)
{
	return ((ref->xseqno & XREF_DELETE_MARKER) != 0);
}

#ifdef CONFIG_JFFS2_FS_XATTR

extern void jffs2_init_xattr_subsystem(struct jffs2_sb_info *c);
extern int jffs2_build_xattr_subsystem(struct jffs2_sb_info *c);
extern void jffs2_clear_xattr_subsystem(struct jffs2_sb_info *c);

extern struct jffs2_xattr_datum *jffs2_setup_xattr_datum(struct jffs2_sb_info *c,
							 uint32_t xid, uint32_t version);

extern void jffs2_xattr_do_crccheck_inode(struct jffs2_sb_info *c, struct jffs2_inode_cache *ic);
extern void jffs2_xattr_delete_inode(struct jffs2_sb_info *c, struct jffs2_inode_cache *ic);
extern void jffs2_xattr_free_inode(struct jffs2_sb_info *c, struct jffs2_inode_cache *ic);

extern int jffs2_garbage_collect_xattr_datum(struct jffs2_sb_info *c, struct jffs2_xattr_datum *xd,
					     struct jffs2_raw_node_ref *raw);
extern int jffs2_garbage_collect_xattr_ref(struct jffs2_sb_info *c, struct jffs2_xattr_ref *ref,
					   struct jffs2_raw_node_ref *raw);
extern int jffs2_verify_xattr(struct jffs2_sb_info *c);
extern void jffs2_release_xattr_datum(struct jffs2_sb_info *c, struct jffs2_xattr_datum *xd);
extern void jffs2_release_xattr_ref(struct jffs2_sb_info *c, struct jffs2_xattr_ref *ref);

extern int do_jffs2_getxattr(struct inode *inode, int xprefix, const char *xname,
			     char *buffer, size_t size);
extern int do_jffs2_setxattr(struct inode *inode, int xprefix, const char *xname,
			     const char *buffer, size_t size, int flags);

extern const struct xattr_handler * const jffs2_xattr_handlers[];
extern const struct xattr_handler jffs2_user_xattr_handler;
extern const struct xattr_handler jffs2_trusted_xattr_handler;

extern ssize_t jffs2_listxattr(struct dentry *, char *, size_t);

Annotation

Implementation Notes