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/fs/jffs2/xattr.h

https://bitbucket.org/cyanogenmod/android_kernel_asus_tf300t
C Header | 131 lines | 97 code | 24 blank | 10 comment | 1 complexity | 0784466d24f5e3cc8dfd424fe468429a MD5 | raw file
Possible License(s): LGPL-2.0, AGPL-1.0, GPL-2.0
  1/*
  2 * JFFS2 -- Journalling Flash File System, Version 2.
  3 *
  4 * Copyright © 2006  NEC Corporation
  5 *
  6 * Created by KaiGai Kohei <kaigai@ak.jp.nec.com>
  7 *
  8 * For licensing information, see the file 'LICENCE' in this directory.
  9 *
 10 */
 11
 12#ifndef _JFFS2_FS_XATTR_H_
 13#define _JFFS2_FS_XATTR_H_
 14
 15#include <linux/xattr.h>
 16#include <linux/list.h>
 17
 18#define JFFS2_XFLAGS_HOT	(0x01)	/* This datum is HOT */
 19#define JFFS2_XFLAGS_BIND	(0x02)	/* This datum is not reclaimed */
 20#define JFFS2_XFLAGS_DEAD	(0x40)	/* This datum is already dead */
 21#define JFFS2_XFLAGS_INVALID	(0x80)	/* This datum contains crc error */
 22
 23struct jffs2_xattr_datum
 24{
 25	void *always_null;
 26	struct jffs2_raw_node_ref *node;
 27	uint8_t class;
 28	uint8_t flags;
 29	uint16_t xprefix;		/* see JFFS2_XATTR_PREFIX_* */
 30
 31	struct list_head xindex;	/* chained from c->xattrindex[n] */
 32	atomic_t refcnt;		/* # of xattr_ref refers this */
 33	uint32_t xid;
 34	uint32_t version;
 35
 36	uint32_t data_crc;
 37	uint32_t hashkey;
 38	char *xname;		/* XATTR name without prefix */
 39	uint32_t name_len;	/* length of xname */
 40	char *xvalue;		/* XATTR value */
 41	uint32_t value_len;	/* length of xvalue */
 42};
 43
 44struct jffs2_inode_cache;
 45struct jffs2_xattr_ref
 46{
 47	void *always_null;
 48	struct jffs2_raw_node_ref *node;
 49	uint8_t class;
 50	uint8_t flags;		/* Currently unused */
 51	u16 unused;
 52
 53	uint32_t xseqno;
 54	union {
 55		struct jffs2_inode_cache *ic;	/* reference to jffs2_inode_cache */
 56		uint32_t ino;			/* only used in scanning/building  */
 57	};
 58	union {
 59		struct jffs2_xattr_datum *xd;	/* reference to jffs2_xattr_datum */
 60		uint32_t xid;			/* only used in sccanning/building */
 61	};
 62	struct jffs2_xattr_ref *next;		/* chained from ic->xref_list */
 63};
 64
 65#define XREF_DELETE_MARKER	(0x00000001)
 66static inline int is_xattr_ref_dead(struct jffs2_xattr_ref *ref)
 67{
 68	return ((ref->xseqno & XREF_DELETE_MARKER) != 0);
 69}
 70
 71#ifdef CONFIG_JFFS2_FS_XATTR
 72
 73extern void jffs2_init_xattr_subsystem(struct jffs2_sb_info *c);
 74extern void jffs2_build_xattr_subsystem(struct jffs2_sb_info *c);
 75extern void jffs2_clear_xattr_subsystem(struct jffs2_sb_info *c);
 76
 77extern struct jffs2_xattr_datum *jffs2_setup_xattr_datum(struct jffs2_sb_info *c,
 78							 uint32_t xid, uint32_t version);
 79
 80extern void jffs2_xattr_delete_inode(struct jffs2_sb_info *c, struct jffs2_inode_cache *ic);
 81extern void jffs2_xattr_free_inode(struct jffs2_sb_info *c, struct jffs2_inode_cache *ic);
 82
 83extern int jffs2_garbage_collect_xattr_datum(struct jffs2_sb_info *c, struct jffs2_xattr_datum *xd,
 84					     struct jffs2_raw_node_ref *raw);
 85extern int jffs2_garbage_collect_xattr_ref(struct jffs2_sb_info *c, struct jffs2_xattr_ref *ref,
 86					   struct jffs2_raw_node_ref *raw);
 87extern int jffs2_verify_xattr(struct jffs2_sb_info *c);
 88extern void jffs2_release_xattr_datum(struct jffs2_sb_info *c, struct jffs2_xattr_datum *xd);
 89extern void jffs2_release_xattr_ref(struct jffs2_sb_info *c, struct jffs2_xattr_ref *ref);
 90
 91extern int do_jffs2_getxattr(struct inode *inode, int xprefix, const char *xname,
 92			     char *buffer, size_t size);
 93extern int do_jffs2_setxattr(struct inode *inode, int xprefix, const char *xname,
 94			     const char *buffer, size_t size, int flags);
 95
 96extern const struct xattr_handler *jffs2_xattr_handlers[];
 97extern const struct xattr_handler jffs2_user_xattr_handler;
 98extern const struct xattr_handler jffs2_trusted_xattr_handler;
 99
100extern ssize_t jffs2_listxattr(struct dentry *, char *, size_t);
101#define jffs2_getxattr		generic_getxattr
102#define jffs2_setxattr		generic_setxattr
103#define jffs2_removexattr	generic_removexattr
104
105#else
106
107#define jffs2_init_xattr_subsystem(c)
108#define jffs2_build_xattr_subsystem(c)
109#define jffs2_clear_xattr_subsystem(c)
110
111#define jffs2_xattr_delete_inode(c, ic)
112#define jffs2_xattr_free_inode(c, ic)
113#define jffs2_verify_xattr(c)			(1)
114
115#define jffs2_xattr_handlers	NULL
116#define jffs2_listxattr		NULL
117#define jffs2_getxattr		NULL
118#define jffs2_setxattr		NULL
119#define jffs2_removexattr	NULL
120
121#endif /* CONFIG_JFFS2_FS_XATTR */
122
123#ifdef CONFIG_JFFS2_FS_SECURITY
124extern int jffs2_init_security(struct inode *inode, struct inode *dir,
125			       const struct qstr *qstr);
126extern const struct xattr_handler jffs2_security_xattr_handler;
127#else
128#define jffs2_init_security(inode,dir,qstr)	(0)
129#endif /* CONFIG_JFFS2_FS_SECURITY */
130
131#endif /* _JFFS2_FS_XATTR_H_ */