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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 | /* File: fs/ext3/xattr.h On-disk format of extended attributes for the ext3 filesystem. (C) 2001 Andreas Gruenbacher, <a.gruenbacher@computer.org> */ #include <linux/config.h> #include <linux/xattr.h> /* Magic value in attribute blocks */ #define EXT3_XATTR_MAGIC 0xEA020000 /* Maximum number of references to one attribute block */ #define EXT3_XATTR_REFCOUNT_MAX 1024 /* Name indexes */ #define EXT3_XATTR_INDEX_MAX 10 #define EXT3_XATTR_INDEX_USER 1 #define EXT3_XATTR_INDEX_POSIX_ACL_ACCESS 2 #define EXT3_XATTR_INDEX_POSIX_ACL_DEFAULT 3 #define EXT3_XATTR_INDEX_TRUSTED 4 #define EXT3_XATTR_INDEX_LUSTRE 5 #define EXT3_XATTR_INDEX_SECURITY 6 struct ext3_xattr_header { __u32 h_magic; /* magic number for identification */ __u32 h_refcount; /* reference count */ __u32 h_blocks; /* number of disk blocks used */ __u32 h_hash; /* hash value of all attributes */ __u32 h_reserved[4]; /* zero right now */ }; struct ext3_xattr_entry { __u8 e_name_len; /* length of name */ __u8 e_name_index; /* attribute name index */ __u16 e_value_offs; /* offset in disk block of value */ __u32 e_value_block; /* disk block attribute is stored on (n/i) */ __u32 e_value_size; /* size of attribute value */ __u32 e_hash; /* hash value of name and value */ char e_name[0]; /* attribute name */ }; #define EXT3_XATTR_PAD_BITS 2 #define EXT3_XATTR_PAD (1<<EXT3_XATTR_PAD_BITS) #define EXT3_XATTR_ROUND (EXT3_XATTR_PAD-1) #define EXT3_XATTR_LEN(name_len) \ (((name_len) + EXT3_XATTR_ROUND + \ sizeof(struct ext3_xattr_entry)) & ~EXT3_XATTR_ROUND) #define EXT3_XATTR_NEXT(entry) \ ( (struct ext3_xattr_entry *)( \ (char *)(entry) + EXT3_XATTR_LEN((entry)->e_name_len)) ) #define EXT3_XATTR_SIZE(size) \ (((size) + EXT3_XATTR_ROUND) & ~EXT3_XATTR_ROUND) # ifdef CONFIG_EXT3_FS_XATTR struct ext3_xattr_handler { char *prefix; size_t (*list)(char *list, struct inode *inode, const char *name, int name_len); int (*get)(struct inode *inode, const char *name, void *buffer, size_t size); int (*set)(struct inode *inode, const char *name, const void *buffer, size_t size, int flags); }; extern int ext3_xattr_register(int, struct ext3_xattr_handler *); extern void ext3_xattr_unregister(int, struct ext3_xattr_handler *); extern int ext3_setxattr(struct dentry *, const char *, const void *, size_t, int); extern ssize_t ext3_getxattr(struct dentry *, const char *, void *, size_t); extern ssize_t ext3_listxattr(struct dentry *, char *, size_t); extern int ext3_removexattr(struct dentry *, const char *); extern int ext3_xattr_get(struct inode *, int, const char *, void *, size_t); extern int ext3_xattr_list(struct inode *, char *, size_t); extern int ext3_xattr_set(struct inode *, int, const char *, const void *, size_t, int); extern int ext3_xattr_set_handle(handle_t *, struct inode *, int, const char *, const void *, size_t, int); extern void ext3_xattr_delete_inode(handle_t *, struct inode *); extern void ext3_xattr_put_super(struct super_block *); extern int init_ext3_xattr(void); extern void exit_ext3_xattr(void); # else /* CONFIG_EXT3_FS_XATTR */ # define ext3_setxattr NULL # define ext3_getxattr NULL # define ext3_listxattr NULL # define ext3_removexattr NULL static inline int ext3_xattr_get(struct inode *inode, int name_index, const char *name, void *buffer, size_t size, int flags) { return -EOPNOTSUPP; } static inline int ext3_xattr_list(struct inode *inode, void *buffer, size_t size) { return -EOPNOTSUPP; } static inline int ext3_xattr_set(struct inode *inode, int name_index, const char *name, const void *value, size_t size, int flags) { return -EOPNOTSUPP; } static inline int ext3_xattr_set_handle(handle_t *handle, struct inode *inode, int name_index, const char *name, const void *value, size_t size, int flags) { return -EOPNOTSUPP; } static inline void ext3_xattr_delete_inode(handle_t *handle, struct inode *inode) { } static inline void ext3_xattr_put_super(struct super_block *sb) { } static inline int init_ext3_xattr(void) { return 0; } static inline void exit_ext3_xattr(void) { } # endif /* CONFIG_EXT3_FS_XATTR */ extern struct ext3_xattr_handler ext3_xattr_user_handler; extern struct ext3_xattr_handler ext3_xattr_trusted_handler; extern struct ext3_xattr_handler ext3_xattr_security_handler; |