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xattr.h
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1 /*
2  * JFFS2 -- Journalling Flash File System, Version 2.
3  *
4  * Copyright © 2006 NEC Corporation
5  *
6  * Created by KaiGai Kohei <[email protected]>
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 
24 {
25  void *always_null;
27  uint8_t class;
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 */
35 
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 
44 struct jffs2_inode_cache;
46 {
47  void *always_null;
49  uint8_t class;
50  uint8_t flags; /* Currently unused */
52 
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)
66 static 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 
73 extern void jffs2_init_xattr_subsystem(struct jffs2_sb_info *c);
74 extern void jffs2_build_xattr_subsystem(struct jffs2_sb_info *c);
75 extern void jffs2_clear_xattr_subsystem(struct jffs2_sb_info *c);
76 
79 
80 extern void jffs2_xattr_do_crccheck_inode(struct jffs2_sb_info *c, struct jffs2_inode_cache *ic);
81 extern void jffs2_xattr_delete_inode(struct jffs2_sb_info *c, struct jffs2_inode_cache *ic);
82 extern void jffs2_xattr_free_inode(struct jffs2_sb_info *c, struct jffs2_inode_cache *ic);
83 
85  struct jffs2_raw_node_ref *raw);
86 extern int jffs2_garbage_collect_xattr_ref(struct jffs2_sb_info *c, struct jffs2_xattr_ref *ref,
87  struct jffs2_raw_node_ref *raw);
88 extern int jffs2_verify_xattr(struct jffs2_sb_info *c);
89 extern void jffs2_release_xattr_datum(struct jffs2_sb_info *c, struct jffs2_xattr_datum *xd);
90 extern void jffs2_release_xattr_ref(struct jffs2_sb_info *c, struct jffs2_xattr_ref *ref);
91 
92 extern int do_jffs2_getxattr(struct inode *inode, int xprefix, const char *xname,
93  char *buffer, size_t size);
94 extern int do_jffs2_setxattr(struct inode *inode, int xprefix, const char *xname,
95  const char *buffer, size_t size, int flags);
96 
97 extern const struct xattr_handler *jffs2_xattr_handlers[];
98 extern const struct xattr_handler jffs2_user_xattr_handler;
99 extern const struct xattr_handler jffs2_trusted_xattr_handler;
100 
101 extern ssize_t jffs2_listxattr(struct dentry *, char *, size_t);
102 #define jffs2_getxattr generic_getxattr
103 #define jffs2_setxattr generic_setxattr
104 #define jffs2_removexattr generic_removexattr
105 
106 #else
107 
108 #define jffs2_init_xattr_subsystem(c)
109 #define jffs2_build_xattr_subsystem(c)
110 #define jffs2_clear_xattr_subsystem(c)
111 
112 #define jffs2_xattr_do_crccheck_inode(c, ic)
113 #define jffs2_xattr_delete_inode(c, ic)
114 #define jffs2_xattr_free_inode(c, ic)
115 #define jffs2_verify_xattr(c) (1)
116 
117 #define jffs2_xattr_handlers NULL
118 #define jffs2_listxattr NULL
119 #define jffs2_getxattr NULL
120 #define jffs2_setxattr NULL
121 #define jffs2_removexattr NULL
122 
123 #endif /* CONFIG_JFFS2_FS_XATTR */
124 
125 #ifdef CONFIG_JFFS2_FS_SECURITY
126 extern int jffs2_init_security(struct inode *inode, struct inode *dir,
127  const struct qstr *qstr);
128 extern const struct xattr_handler jffs2_security_xattr_handler;
129 #else
130 #define jffs2_init_security(inode,dir,qstr) (0)
131 #endif /* CONFIG_JFFS2_FS_SECURITY */
132 
133 #endif /* _JFFS2_FS_XATTR_H_ */