2 * JFFS2 -- Journalling Flash File System, Version 2.
4 * Copyright (C) 2006 NEC Corporation
6 * Created by KaiGai Kohei <kaigai@ak.jp.nec.com>
8 * For licensing information, see the file 'LICENCE' in this directory.
11 #ifndef _JFFS2_FS_XATTR_H_
12 #define _JFFS2_FS_XATTR_H_
14 #include <linux/xattr.h>
15 #include <linux/list.h>
17 #define JFFS2_XFLAGS_HOT (0x01) /* This datum is HOT */
18 #define JFFS2_XFLAGS_BIND (0x02) /* This datum is not reclaimed */
19 #define JFFS2_XFLAGS_INVALID (0x80) /* This datum contains crc error */
21 struct jffs2_xattr_datum
24 struct jffs2_raw_node_ref *node;
27 uint16_t xprefix; /* see JFFS2_XATTR_PREFIX_* */
29 struct list_head xindex; /* chained from c->xattrindex[n] */
30 uint32_t refcnt; /* # of xattr_ref refers this */
36 char *xname; /* XATTR name without prefix */
37 uint32_t name_len; /* length of xname */
38 char *xvalue; /* XATTR value */
39 uint32_t value_len; /* length of xvalue */
42 struct jffs2_inode_cache;
43 struct jffs2_xattr_ref
46 struct jffs2_raw_node_ref *node;
48 uint8_t flags; /* Currently unused */
53 struct jffs2_inode_cache *ic; /* reference to jffs2_inode_cache */
54 uint32_t ino; /* only used in scanning/building */
57 struct jffs2_xattr_datum *xd; /* reference to jffs2_xattr_datum */
58 uint32_t xid; /* only used in sccanning/building */
60 struct jffs2_xattr_ref *next; /* chained from ic->xref_list */
63 #define XDATUM_DELETE_MARKER (0xffffffff)
64 #define XREF_DELETE_MARKER (0x00000001)
65 static inline int is_xattr_datum_dead(struct jffs2_xattr_datum *xd)
67 return (xd->version == XDATUM_DELETE_MARKER);
70 static inline void set_xattr_datum_dead(struct jffs2_xattr_datum *xd)
72 xd->version = XDATUM_DELETE_MARKER;
75 static inline int is_xattr_ref_dead(struct jffs2_xattr_ref *ref)
77 return ((ref->xseqno & XREF_DELETE_MARKER) != 0);
80 static inline void set_xattr_ref_dead(struct jffs2_xattr_ref *ref)
82 ref->xseqno |= XREF_DELETE_MARKER;
85 static inline void clr_xattr_ref_dead(struct jffs2_xattr_ref *ref)
87 ref->xseqno &= ~XREF_DELETE_MARKER;
91 #ifdef CONFIG_JFFS2_FS_XATTR
93 extern void jffs2_init_xattr_subsystem(struct jffs2_sb_info *c);
94 extern void jffs2_build_xattr_subsystem(struct jffs2_sb_info *c);
95 extern void jffs2_clear_xattr_subsystem(struct jffs2_sb_info *c);
97 extern struct jffs2_xattr_datum *jffs2_setup_xattr_datum(struct jffs2_sb_info *c,
98 uint32_t xid, uint32_t version);
100 extern void jffs2_xattr_delete_inode(struct jffs2_sb_info *c, struct jffs2_inode_cache *ic);
101 extern void jffs2_xattr_free_inode(struct jffs2_sb_info *c, struct jffs2_inode_cache *ic);
103 extern int jffs2_garbage_collect_xattr_datum(struct jffs2_sb_info *c, struct jffs2_xattr_datum *xd,
104 struct jffs2_raw_node_ref *raw);
105 extern int jffs2_garbage_collect_xattr_ref(struct jffs2_sb_info *c, struct jffs2_xattr_ref *ref,
106 struct jffs2_raw_node_ref *raw);
107 extern int jffs2_verify_xattr(struct jffs2_sb_info *c);
108 extern void jffs2_release_xattr_datum(struct jffs2_sb_info *c, struct jffs2_xattr_datum *xd);
109 extern void jffs2_release_xattr_ref(struct jffs2_sb_info *c, struct jffs2_xattr_ref *ref);
111 extern int do_jffs2_getxattr(struct inode *inode, int xprefix, const char *xname,
112 char *buffer, size_t size);
113 extern int do_jffs2_setxattr(struct inode *inode, int xprefix, const char *xname,
114 const char *buffer, size_t size, int flags);
116 extern struct xattr_handler *jffs2_xattr_handlers[];
117 extern struct xattr_handler jffs2_user_xattr_handler;
118 extern struct xattr_handler jffs2_trusted_xattr_handler;
120 extern ssize_t jffs2_listxattr(struct dentry *, char *, size_t);
121 #define jffs2_getxattr generic_getxattr
122 #define jffs2_setxattr generic_setxattr
123 #define jffs2_removexattr generic_removexattr
127 #define jffs2_init_xattr_subsystem(c)
128 #define jffs2_build_xattr_subsystem(c)
129 #define jffs2_clear_xattr_subsystem(c)
131 #define jffs2_xattr_delete_inode(c, ic)
132 #define jffs2_xattr_free_inode(c, ic)
133 #define jffs2_verify_xattr(c) (1)
135 #define jffs2_xattr_handlers NULL
136 #define jffs2_listxattr NULL
137 #define jffs2_getxattr NULL
138 #define jffs2_setxattr NULL
139 #define jffs2_removexattr NULL
141 #endif /* CONFIG_JFFS2_FS_XATTR */
143 #ifdef CONFIG_JFFS2_FS_SECURITY
144 extern int jffs2_init_security(struct inode *inode, struct inode *dir);
145 extern struct xattr_handler jffs2_security_xattr_handler;
147 #define jffs2_init_security(inode,dir) (0)
148 #endif /* CONFIG_JFFS2_FS_SECURITY */
150 #endif /* _JFFS2_FS_XATTR_H_ */