[net-next-2.6.git] / fs / jffs2 / xattr.h

/*
 * JFFS2 -- Journalling Flash File System, Version 2.
 *
 * Copyright (C) 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 */

struct jffs2_xattr_datum
{
	void *always_null;
	u8 class;
	u8 flags;
	u16 xprefix;			/* see JFFS2_XATTR_PREFIX_* */

	struct jffs2_raw_node_ref *node;
	struct list_head xindex;	/* chained from c->xattrindex[n] */
	uint32_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;
	u8 class;
	u8 flags;		/* Currently unused */
	u16 unused;

	struct jffs2_raw_node_ref *node;
	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 */
};

#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_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);
extern int jffs2_garbage_collect_xattr_ref(struct jffs2_sb_info *c, struct jffs2_xattr_ref *ref);
extern int jffs2_verify_xattr(struct jffs2_sb_info *c);

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 struct xattr_handler *jffs2_xattr_handlers[];
extern struct xattr_handler jffs2_user_xattr_handler;
extern 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_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);
extern struct xattr_handler jffs2_security_xattr_handler;
#else
#define jffs2_init_security(inode,dir)	(0)
#endif /* CONFIG_JFFS2_FS_SECURITY */

#endif /* _JFFS2_FS_XATTR_H_ */
Commit	Line	Data
652ecc20 KK	1	/*
652ecc20 KK	2	* JFFS2 -- Journalling Flash File System, Version 2.
aa98d7cf	3	*
652ecc20	4	* Copyright (C) 2006 NEC Corporation
aa98d7cf	5	*
652ecc20 KK	6	* Created by KaiGai Kohei <kaigai@ak.jp.nec.com>
	7	*
	8	* For licensing information, see the file 'LICENCE' in this directory.
	9	*
	10	*/
aa98d7cf KK	11	#ifndef _JFFS2_FS_XATTR_H_
	12	#define _JFFS2_FS_XATTR_H_
	13
	14	#include <linux/xattr.h>
4470d040	15	#include <linux/list.h>
aa98d7cf KK	16
	17	#define JFFS2_XFLAGS_HOT (0x01) /* This datum is HOT */
	18	#define JFFS2_XFLAGS_BIND (0x02) /* This datum is not reclaimed */
	19
	20	struct jffs2_xattr_datum
	21	{
	22	void *always_null;
	23	u8 class;
	24	u8 flags;
	25	u16 xprefix; /* see JFFS2_XATTR_PREFIX_* */
	26
	27	struct jffs2_raw_node_ref *node;
	28	struct list_head xindex; /* chained from c->xattrindex[n] */
	29	uint32_t refcnt; /* # of xattr_ref refers this */
	30	uint32_t xid;
	31	uint32_t version;
	32
	33	uint32_t data_crc;
	34	uint32_t hashkey;
	35	char xname; / XATTR name without prefix */
	36	uint32_t name_len; /* length of xname */
	37	char xvalue; / XATTR value */
	38	uint32_t value_len; /* length of xvalue */
	39	};
	40
ee886b5d	41	struct jffs2_inode_cache;
aa98d7cf KK	42	struct jffs2_xattr_ref
	43	{
	44	void *always_null;
	45	u8 class;
	46	u8 flags; /* Currently unused */
	47	u16 unused;
	48
	49	struct jffs2_raw_node_ref *node;
	50	union {
	51	struct jffs2_inode_cache ic; / reference to jffs2_inode_cache */
	52	uint32_t ino; /* only used in scanning/building */
	53	};
	54	union {
	55	struct jffs2_xattr_datum xd; / reference to jffs2_xattr_datum */
	56	uint32_t xid; /* only used in sccanning/building */
	57	};
8f2b6f49	58	struct jffs2_xattr_ref next; / chained from ic->xref_list */
aa98d7cf KK	59	};
	60
	61	#ifdef CONFIG_JFFS2_FS_XATTR
	62
	63	extern void jffs2_init_xattr_subsystem(struct jffs2_sb_info *c);
	64	extern void jffs2_build_xattr_subsystem(struct jffs2_sb_info *c);
	65	extern void jffs2_clear_xattr_subsystem(struct jffs2_sb_info *c);
	66
	67	extern struct jffs2_xattr_datum jffs2_setup_xattr_datum(struct jffs2_sb_info c,
	68	uint32_t xid, uint32_t version);
	69
	70	extern void jffs2_xattr_delete_inode(struct jffs2_sb_info c, struct jffs2_inode_cache ic);
	71	extern void jffs2_xattr_free_inode(struct jffs2_sb_info c, struct jffs2_inode_cache ic);
	72
084702e0 KK	73	extern int jffs2_garbage_collect_xattr_datum(struct jffs2_sb_info c, struct jffs2_xattr_datum xd);
084702e0 KK	74	extern int jffs2_garbage_collect_xattr_ref(struct jffs2_sb_info c, struct jffs2_xattr_ref ref);
aa98d7cf KK	75	extern int jffs2_verify_xattr(struct jffs2_sb_info *c);
	76
	77	extern int do_jffs2_getxattr(struct inode inode, int xprefix, const char xname,
	78	char *buffer, size_t size);
	79	extern int do_jffs2_setxattr(struct inode inode, int xprefix, const char xname,
	80	const char *buffer, size_t size, int flags);
	81
	82	extern struct xattr_handler *jffs2_xattr_handlers[];
	83	extern struct xattr_handler jffs2_user_xattr_handler;
	84	extern struct xattr_handler jffs2_trusted_xattr_handler;
	85
	86	extern ssize_t jffs2_listxattr(struct dentry , char , size_t);
	87	#define jffs2_getxattr generic_getxattr
	88	#define jffs2_setxattr generic_setxattr
	89	#define jffs2_removexattr generic_removexattr
	90
aa98d7cf KK	91	#else
	92
	93	#define jffs2_init_xattr_subsystem(c)
	94	#define jffs2_build_xattr_subsystem(c)
	95	#define jffs2_clear_xattr_subsystem(c)
	96
	97	#define jffs2_xattr_delete_inode(c, ic)
	98	#define jffs2_xattr_free_inode(c, ic)
aa98d7cf KK	99	#define jffs2_verify_xattr(c) (1)
	100
	101	#define jffs2_xattr_handlers NULL
	102	#define jffs2_listxattr NULL
	103	#define jffs2_getxattr NULL
	104	#define jffs2_setxattr NULL
	105	#define jffs2_removexattr NULL
	106
aa98d7cf KK	107	#endif /* CONFIG_JFFS2_FS_XATTR */
	108
	109	#ifdef CONFIG_JFFS2_FS_SECURITY
	110	extern int jffs2_init_security(struct inode inode, struct inode dir);
	111	extern struct xattr_handler jffs2_security_xattr_handler;
	112	#else
	113	#define jffs2_init_security(inode,dir) (0)
	114	#endif /* CONFIG_JFFS2_FS_SECURITY */
	115
	116	#endif /* _JFFS2_FS_XATTR_H_ */