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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 <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 | |
23 | struct 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 | |
44 | struct jffs2_inode_cache; |
45 | struct 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) |
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 | |
77 | extern struct jffs2_xattr_datum *jffs2_setup_xattr_datum(struct jffs2_sb_info *c, |
78 | uint32_t xid, uint32_t version); |
79 | |
80 | extern void jffs2_xattr_delete_inode(struct jffs2_sb_info *c, struct jffs2_inode_cache *ic); |
81 | extern void jffs2_xattr_free_inode(struct jffs2_sb_info *c, struct jffs2_inode_cache *ic); |
82 | |
83 | extern int jffs2_garbage_collect_xattr_datum(struct jffs2_sb_info *c, struct jffs2_xattr_datum *xd, |
84 | struct jffs2_raw_node_ref *raw); |
85 | extern int jffs2_garbage_collect_xattr_ref(struct jffs2_sb_info *c, struct jffs2_xattr_ref *ref, |
86 | struct jffs2_raw_node_ref *raw); |
87 | extern int jffs2_verify_xattr(struct jffs2_sb_info *c); |
88 | extern void jffs2_release_xattr_datum(struct jffs2_sb_info *c, struct jffs2_xattr_datum *xd); |
89 | extern void jffs2_release_xattr_ref(struct jffs2_sb_info *c, struct jffs2_xattr_ref *ref); |
90 | |
91 | extern int do_jffs2_getxattr(struct inode *inode, int xprefix, const char *xname, |
92 | char *buffer, size_t size); |
93 | extern int do_jffs2_setxattr(struct inode *inode, int xprefix, const char *xname, |
94 | const char *buffer, size_t size, int flags); |
95 | |
96 | extern struct xattr_handler *jffs2_xattr_handlers[]; |
97 | extern struct xattr_handler jffs2_user_xattr_handler; |
98 | extern struct xattr_handler jffs2_trusted_xattr_handler; |
99 | |
100 | extern 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 |
124 | extern int jffs2_init_security(struct inode *inode, struct inode *dir); |
125 | extern struct xattr_handler jffs2_security_xattr_handler; |
126 | #else |
127 | #define jffs2_init_security(inode,dir) (0) |
128 | #endif /* CONFIG_JFFS2_FS_SECURITY */ |
129 | |
130 | #endif /* _JFFS2_FS_XATTR_H_ */ |
131 |
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