xattr.h
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/*
* JFFS2 -- Journalling Flash File System, Version 2.
*
* Copyright © 2006 NEC Corporation
*
* Created by KaiGai Kohei <kaigai@ak.jp.nec.com>
*
* For licensing information, see the file 'LICENCE' in this directory.
*
*/
#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 void 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 *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);
#define jffs2_getxattr generic_getxattr
#define jffs2_setxattr generic_setxattr
#define jffs2_removexattr generic_removexattr
#else
#define jffs2_init_xattr_subsystem(c)
#define jffs2_build_xattr_subsystem(c)
#define jffs2_clear_xattr_subsystem(c)
#define jffs2_xattr_do_crccheck_inode(c, ic)
#define jffs2_xattr_delete_inode(c, ic)
#define jffs2_xattr_free_inode(c, ic)
#define jffs2_verify_xattr(c) (1)
#define jffs2_xattr_handlers NULL
#define jffs2_listxattr NULL
#define jffs2_getxattr NULL
#define jffs2_setxattr NULL
#define jffs2_removexattr NULL
#endif /* CONFIG_JFFS2_FS_XATTR */
#ifdef CONFIG_JFFS2_FS_SECURITY
extern int jffs2_init_security(struct inode *inode, struct inode *dir,
const struct qstr *qstr);
extern const struct xattr_handler jffs2_security_xattr_handler;
#else
#define jffs2_init_security(inode,dir,qstr) (0)
#endif /* CONFIG_JFFS2_FS_SECURITY */
#endif /* _JFFS2_FS_XATTR_H_ */