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1 | /* |
2 | File: linux/reiserfs_xattr.h |
3 | */ |
4 | |
5 | #ifndef _LINUX_REISERFS_XATTR_H |
6 | #define _LINUX_REISERFS_XATTR_H |
7 | |
8 | #include <linux/types.h> |
9 | |
10 | /* Magic value in header */ |
11 | #define REISERFS_XATTR_MAGIC 0x52465841 /* "RFXA" */ |
12 | |
13 | struct reiserfs_xattr_header { |
14 | __le32 h_magic; /* magic number for identification */ |
15 | __le32 h_hash; /* hash of the value */ |
16 | }; |
17 | |
18 | struct reiserfs_security_handle { |
19 | char *name; |
20 | void *value; |
21 | size_t length; |
22 | }; |
23 | |
24 | #ifdef __KERNEL__ |
25 | |
26 | #include <linux/init.h> |
27 | #include <linux/list.h> |
28 | #include <linux/rwsem.h> |
29 | #include <linux/reiserfs_fs_i.h> |
30 | #include <linux/reiserfs_fs.h> |
31 | |
32 | struct inode; |
33 | struct dentry; |
34 | struct iattr; |
35 | struct super_block; |
36 | struct nameidata; |
37 | |
38 | int reiserfs_xattr_register_handlers(void) __init; |
39 | void reiserfs_xattr_unregister_handlers(void); |
40 | int reiserfs_xattr_init(struct super_block *sb, int mount_flags); |
41 | int reiserfs_lookup_privroot(struct super_block *sb); |
42 | int reiserfs_delete_xattrs(struct inode *inode); |
43 | int reiserfs_chown_xattrs(struct inode *inode, struct iattr *attrs); |
44 | int reiserfs_permission(struct inode *inode, int mask); |
45 | |
46 | #ifdef CONFIG_REISERFS_FS_XATTR |
47 | #define has_xattr_dir(inode) (REISERFS_I(inode)->i_flags & i_has_xattr_dir) |
48 | ssize_t reiserfs_getxattr(struct dentry *dentry, const char *name, |
49 | void *buffer, size_t size); |
50 | int reiserfs_setxattr(struct dentry *dentry, const char *name, |
51 | const void *value, size_t size, int flags); |
52 | ssize_t reiserfs_listxattr(struct dentry *dentry, char *buffer, size_t size); |
53 | int reiserfs_removexattr(struct dentry *dentry, const char *name); |
54 | |
55 | int reiserfs_xattr_get(struct inode *, const char *, void *, size_t); |
56 | int reiserfs_xattr_set(struct inode *, const char *, const void *, size_t, int); |
57 | int reiserfs_xattr_set_handle(struct reiserfs_transaction_handle *, |
58 | struct inode *, const char *, const void *, |
59 | size_t, int); |
60 | |
61 | extern struct xattr_handler reiserfs_xattr_user_handler; |
62 | extern struct xattr_handler reiserfs_xattr_trusted_handler; |
63 | extern struct xattr_handler reiserfs_xattr_security_handler; |
64 | #ifdef CONFIG_REISERFS_FS_SECURITY |
65 | int reiserfs_security_init(struct inode *dir, struct inode *inode, |
66 | struct reiserfs_security_handle *sec); |
67 | int reiserfs_security_write(struct reiserfs_transaction_handle *th, |
68 | struct inode *inode, |
69 | struct reiserfs_security_handle *sec); |
70 | void reiserfs_security_free(struct reiserfs_security_handle *sec); |
71 | #endif |
72 | |
73 | #define xattr_size(size) ((size) + sizeof(struct reiserfs_xattr_header)) |
74 | static inline loff_t reiserfs_xattr_nblocks(struct inode *inode, loff_t size) |
75 | { |
76 | loff_t ret = 0; |
77 | if (reiserfs_file_data_log(inode)) { |
78 | ret = _ROUND_UP(xattr_size(size), inode->i_sb->s_blocksize); |
79 | ret >>= inode->i_sb->s_blocksize_bits; |
80 | } |
81 | return ret; |
82 | } |
83 | |
84 | /* We may have to create up to 3 objects: xattr root, xattr dir, xattr file. |
85 | * Let's try to be smart about it. |
86 | * xattr root: We cache it. If it's not cached, we may need to create it. |
87 | * xattr dir: If anything has been loaded for this inode, we can set a flag |
88 | * saying so. |
89 | * xattr file: Since we don't cache xattrs, we can't tell. We always include |
90 | * blocks for it. |
91 | * |
92 | * However, since root and dir can be created between calls - YOU MUST SAVE |
93 | * THIS VALUE. |
94 | */ |
95 | static inline size_t reiserfs_xattr_jcreate_nblocks(struct inode *inode) |
96 | { |
97 | size_t nblocks = JOURNAL_BLOCKS_PER_OBJECT(inode->i_sb); |
98 | |
99 | if ((REISERFS_I(inode)->i_flags & i_has_xattr_dir) == 0) { |
100 | nblocks += JOURNAL_BLOCKS_PER_OBJECT(inode->i_sb); |
101 | if (!REISERFS_SB(inode->i_sb)->xattr_root->d_inode) |
102 | nblocks += JOURNAL_BLOCKS_PER_OBJECT(inode->i_sb); |
103 | } |
104 | |
105 | return nblocks; |
106 | } |
107 | |
108 | static inline void reiserfs_init_xattr_rwsem(struct inode *inode) |
109 | { |
110 | init_rwsem(&REISERFS_I(inode)->i_xattr_sem); |
111 | } |
112 | |
113 | #else |
114 | |
115 | #define reiserfs_getxattr NULL |
116 | #define reiserfs_setxattr NULL |
117 | #define reiserfs_listxattr NULL |
118 | #define reiserfs_removexattr NULL |
119 | |
120 | static inline void reiserfs_init_xattr_rwsem(struct inode *inode) |
121 | { |
122 | } |
123 | #endif /* CONFIG_REISERFS_FS_XATTR */ |
124 | |
125 | #ifndef CONFIG_REISERFS_FS_SECURITY |
126 | static inline int reiserfs_security_init(struct inode *dir, |
127 | struct inode *inode, |
128 | struct reiserfs_security_handle *sec) |
129 | { |
130 | return 0; |
131 | } |
132 | static inline int |
133 | reiserfs_security_write(struct reiserfs_transaction_handle *th, |
134 | struct inode *inode, |
135 | struct reiserfs_security_handle *sec) |
136 | { |
137 | return 0; |
138 | } |
139 | static inline void reiserfs_security_free(struct reiserfs_security_handle *sec) |
140 | {} |
141 | #endif |
142 | |
143 | #endif /* __KERNEL__ */ |
144 | |
145 | #endif /* _LINUX_REISERFS_XATTR_H */ |
146 |
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od-2011-09-04
od-2011-09-18
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