projects / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 1da177e4 LT |
1 | /* |
| 2 | File: fs/ext3/xattr.h | |
| 3 | ||
| 4 | On-disk format of extended attributes for the ext3 filesystem. | |
| 5 | ||
| 6 | (C) 2001 Andreas Gruenbacher, <[email protected]> | |
| 7 | */ | |
| 8 | ||
| 1da177e4 LT |
9 | #include <linux/xattr.h> |
| 10 | ||
| 11 | /* Magic value in attribute blocks */ | |
| 12 | #define EXT3_XATTR_MAGIC 0xEA020000 | |
| 13 | ||
| 14 | /* Maximum number of references to one attribute block */ | |
| 15 | #define EXT3_XATTR_REFCOUNT_MAX 1024 | |
| 16 | ||
| 17 | /* Name indexes */ | |
| 18 | #define EXT3_XATTR_INDEX_USER 1 | |
| 19 | #define EXT3_XATTR_INDEX_POSIX_ACL_ACCESS 2 | |
| 20 | #define EXT3_XATTR_INDEX_POSIX_ACL_DEFAULT 3 | |
| 21 | #define EXT3_XATTR_INDEX_TRUSTED 4 | |
| 22 | #define EXT3_XATTR_INDEX_LUSTRE 5 | |
| 23 | #define EXT3_XATTR_INDEX_SECURITY 6 | |
| 24 | ||
| 25 | struct ext3_xattr_header { | |
| 26 | __le32 h_magic; /* magic number for identification */ | |
| 27 | __le32 h_refcount; /* reference count */ | |
| 28 | __le32 h_blocks; /* number of disk blocks used */ | |
| 29 | __le32 h_hash; /* hash value of all attributes */ | |
| 30 | __u32 h_reserved[4]; /* zero right now */ | |
| 31 | }; | |
| 32 | ||
| 33 | struct ext3_xattr_ibody_header { | |
| 34 | __le32 h_magic; /* magic number for identification */ | |
| 35 | }; | |
| 36 | ||
| 37 | struct ext3_xattr_entry { | |
| 38 | __u8 e_name_len; /* length of name */ | |
| 39 | __u8 e_name_index; /* attribute name index */ | |
| 40 | __le16 e_value_offs; /* offset in disk block of value */ | |
| 41 | __le32 e_value_block; /* disk block attribute is stored on (n/i) */ | |
| 42 | __le32 e_value_size; /* size of attribute value */ | |
| 43 | __le32 e_hash; /* hash value of name and value */ | |
| 44 | char e_name[0]; /* attribute name */ | |
| 45 | }; | |
| 46 | ||
| 47 | #define EXT3_XATTR_PAD_BITS 2 | |
| 48 | #define EXT3_XATTR_PAD (1<<EXT3_XATTR_PAD_BITS) | |
| 49 | #define EXT3_XATTR_ROUND (EXT3_XATTR_PAD-1) | |
| 50 | #define EXT3_XATTR_LEN(name_len) \ | |
| 51 | (((name_len) + EXT3_XATTR_ROUND + \ | |
| 52 | sizeof(struct ext3_xattr_entry)) & ~EXT3_XATTR_ROUND) | |
| 53 | #define EXT3_XATTR_NEXT(entry) \ | |
| 54 | ( (struct ext3_xattr_entry *)( \ | |
| 55 | (char *)(entry) + EXT3_XATTR_LEN((entry)->e_name_len)) ) | |
| 56 | #define EXT3_XATTR_SIZE(size) \ | |
| 57 | (((size) + EXT3_XATTR_ROUND) & ~EXT3_XATTR_ROUND) | |
| 58 | ||
| 59 | # ifdef CONFIG_EXT3_FS_XATTR | |
| 60 | ||
| d1f21049 SH |
61 | extern const struct xattr_handler ext3_xattr_user_handler; |
| 62 | extern const struct xattr_handler ext3_xattr_trusted_handler; | |
| 63 | extern const struct xattr_handler ext3_xattr_acl_access_handler; | |
| 64 | extern const struct xattr_handler ext3_xattr_acl_default_handler; | |
| 65 | extern const struct xattr_handler ext3_xattr_security_handler; | |
| 1da177e4 LT |
66 | |
| 67 | extern ssize_t ext3_listxattr(struct dentry *, char *, size_t); | |
| 68 | ||
| 69 | extern int ext3_xattr_get(struct inode *, int, const char *, void *, size_t); | |
| 1da177e4 LT |
70 | extern int ext3_xattr_set(struct inode *, int, const char *, const void *, size_t, int); |
| 71 | extern int ext3_xattr_set_handle(handle_t *, struct inode *, int, const char *, const void *, size_t, int); | |
| 72 | ||
| 73 | extern void ext3_xattr_delete_inode(handle_t *, struct inode *); | |
| 74 | extern void ext3_xattr_put_super(struct super_block *); | |
| 75 | ||
| 76 | extern int init_ext3_xattr(void); | |
| 77 | extern void exit_ext3_xattr(void); | |
| 78 | ||
| d1f21049 | 79 | extern const struct xattr_handler *ext3_xattr_handlers[]; |
| 1da177e4 LT |
80 | |
| 81 | # else /* CONFIG_EXT3_FS_XATTR */ | |
| 82 | ||
| 83 | static inline int | |
| 84 | ext3_xattr_get(struct inode *inode, int name_index, const char *name, | |
| 85 | void *buffer, size_t size, int flags) | |
| 86 | { | |
| 87 | return -EOPNOTSUPP; | |
| 88 | } | |
| 89 | ||
| 1da177e4 LT |
90 | static inline int |
| 91 | ext3_xattr_set(struct inode *inode, int name_index, const char *name, | |
| 92 | const void *value, size_t size, int flags) | |
| 93 | { | |
| 94 | return -EOPNOTSUPP; | |
| 95 | } | |
| 96 | ||
| 97 | static inline int | |
| 98 | ext3_xattr_set_handle(handle_t *handle, struct inode *inode, int name_index, | |
| 99 | const char *name, const void *value, size_t size, int flags) | |
| 100 | { | |
| 101 | return -EOPNOTSUPP; | |
| 102 | } | |
| 103 | ||
| 104 | static inline void | |
| 105 | ext3_xattr_delete_inode(handle_t *handle, struct inode *inode) | |
| 106 | { | |
| 107 | } | |
| 108 | ||
| 109 | static inline void | |
| 110 | ext3_xattr_put_super(struct super_block *sb) | |
| 111 | { | |
| 112 | } | |
| 113 | ||
| 114 | static inline int | |
| 115 | init_ext3_xattr(void) | |
| 116 | { | |
| 117 | return 0; | |
| 118 | } | |
| 119 | ||
| 120 | static inline void | |
| 121 | exit_ext3_xattr(void) | |
| 122 | { | |
| 123 | } | |
| 124 | ||
| 125 | #define ext3_xattr_handlers NULL | |
| 126 | ||
| 127 | # endif /* CONFIG_EXT3_FS_XATTR */ | |
| ac50960a SS |
128 | |
| 129 | #ifdef CONFIG_EXT3_FS_SECURITY | |
| 130 | extern int ext3_init_security(handle_t *handle, struct inode *inode, | |
| 131 | struct inode *dir); | |
| 132 | #else | |
| 133 | static inline int ext3_init_security(handle_t *handle, struct inode *inode, | |
| 134 | struct inode *dir) | |
| 135 | { | |
| 136 | return 0; | |
| 137 | } | |
| 138 | #endif |