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

/*-------------------------------------------------------------------------*
 *  File: fs/jffs2/xattr.c
 *  XATTR support on JFFS2 FileSystem
 *
 *  Implemented by KaiGai Kohei <kaigai@ak.jp.nec.com>
 *  Copyright (C) 2006 NEC Corporation
 *
 *  For licensing information, see the file 'LICENCE' in the jffs2 directory.
 *-------------------------------------------------------------------------*/

#ifndef _JFFS2_FS_XATTR_H_
#define _JFFS2_FS_XATTR_H_

#include <linux/xattr.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;	/* forward refence */
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
aa98d7cf KK	1	/-------------------------------------------------------------------------
	2	* File: fs/jffs2/xattr.c
	3	* XATTR support on JFFS2 FileSystem
	4	*
	5	* Implemented by KaiGai Kohei <kaigai@ak.jp.nec.com>
	6	* Copyright (C) 2006 NEC Corporation
	7	*
	8	* For licensing information, see the file 'LICENCE' in the jffs2 directory.
	9	-------------------------------------------------------------------------/
	10
	11	#ifndef _JFFS2_FS_XATTR_H_
	12	#define _JFFS2_FS_XATTR_H_
	13
	14	#include <linux/xattr.h>
	15
	16	#define JFFS2_XFLAGS_HOT (0x01) /* This datum is HOT */
	17	#define JFFS2_XFLAGS_BIND (0x02) /* This datum is not reclaimed */
	18
	19	struct jffs2_xattr_datum
	20	{
	21	void *always_null;
	22	u8 class;
	23	u8 flags;
	24	u16 xprefix; /* see JFFS2_XATTR_PREFIX_* */
	25
	26	struct jffs2_raw_node_ref *node;
	27	struct list_head xindex; /* chained from c->xattrindex[n] */
	28	uint32_t refcnt; /* # of xattr_ref refers this */
	29	uint32_t xid;
	30	uint32_t version;
	31
	32	uint32_t data_crc;
	33	uint32_t hashkey;
	34	char xname; / XATTR name without prefix */
	35	uint32_t name_len; /* length of xname */
	36	char xvalue; / XATTR value */
	37	uint32_t value_len; /* length of xvalue */
	38	};
	39
	40	struct jffs2_inode_cache; /* forward refence */
	41	struct jffs2_xattr_ref
	42	{
	43	void *always_null;
	44	u8 class;
	45	u8 flags; /* Currently unused */
	46	u16 unused;
	47
	48	struct jffs2_raw_node_ref *node;
	49	union {
	50	struct jffs2_inode_cache ic; / reference to jffs2_inode_cache */
	51	uint32_t ino; /* only used in scanning/building */
	52	};
	53	union {
	54	struct jffs2_xattr_datum xd; / reference to jffs2_xattr_datum */
	55	uint32_t xid; /* only used in sccanning/building */
	56	};
8f2b6f49	57	struct jffs2_xattr_ref next; / chained from ic->xref_list */
aa98d7cf KK	58	};
	59
	60	#ifdef CONFIG_JFFS2_FS_XATTR
	61
	62	extern void jffs2_init_xattr_subsystem(struct jffs2_sb_info *c);
	63	extern void jffs2_build_xattr_subsystem(struct jffs2_sb_info *c);
	64	extern void jffs2_clear_xattr_subsystem(struct jffs2_sb_info *c);
	65
	66	extern struct jffs2_xattr_datum jffs2_setup_xattr_datum(struct jffs2_sb_info c,
	67	uint32_t xid, uint32_t version);
	68
	69	extern void jffs2_xattr_delete_inode(struct jffs2_sb_info c, struct jffs2_inode_cache ic);
	70	extern void jffs2_xattr_free_inode(struct jffs2_sb_info c, struct jffs2_inode_cache ic);
	71
084702e0 KK	72	extern int jffs2_garbage_collect_xattr_datum(struct jffs2_sb_info c, struct jffs2_xattr_datum xd);
084702e0 KK	73	extern int jffs2_garbage_collect_xattr_ref(struct jffs2_sb_info c, struct jffs2_xattr_ref ref);
aa98d7cf KK	74	extern int jffs2_verify_xattr(struct jffs2_sb_info *c);
	75
	76	extern int do_jffs2_getxattr(struct inode inode, int xprefix, const char xname,
	77	char *buffer, size_t size);
	78	extern int do_jffs2_setxattr(struct inode inode, int xprefix, const char xname,
	79	const char *buffer, size_t size, int flags);
	80
	81	extern struct xattr_handler *jffs2_xattr_handlers[];
	82	extern struct xattr_handler jffs2_user_xattr_handler;
	83	extern struct xattr_handler jffs2_trusted_xattr_handler;
	84
	85	extern ssize_t jffs2_listxattr(struct dentry , char , size_t);
	86	#define jffs2_getxattr generic_getxattr
	87	#define jffs2_setxattr generic_setxattr
	88	#define jffs2_removexattr generic_removexattr
	89
aa98d7cf KK	90	#else
	91
	92	#define jffs2_init_xattr_subsystem(c)
	93	#define jffs2_build_xattr_subsystem(c)
	94	#define jffs2_clear_xattr_subsystem(c)
	95
	96	#define jffs2_xattr_delete_inode(c, ic)
	97	#define jffs2_xattr_free_inode(c, ic)
aa98d7cf KK	98	#define jffs2_verify_xattr(c) (1)
	99
	100	#define jffs2_xattr_handlers NULL
	101	#define jffs2_listxattr NULL
	102	#define jffs2_getxattr NULL
	103	#define jffs2_setxattr NULL
	104	#define jffs2_removexattr NULL
	105
aa98d7cf KK	106	#endif /* CONFIG_JFFS2_FS_XATTR */
	107
	108	#ifdef CONFIG_JFFS2_FS_SECURITY
	109	extern int jffs2_init_security(struct inode inode, struct inode dir);
	110	extern struct xattr_handler jffs2_security_xattr_handler;
	111	#else
	112	#define jffs2_init_security(inode,dir) (0)
	113	#endif /* CONFIG_JFFS2_FS_SECURITY */
	114
	115	#endif /* _JFFS2_FS_XATTR_H_ */