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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 | /* File: linux/ext2_xattr.h On-disk format of extended attributes for the ext2 filesystem. (C) 2001 Andreas Gruenbacher, <a.gruenbacher@computer.org> */ #include <linux/init.h> #include <linux/xattr.h> /* Magic value in attribute blocks */ #define EXT2_XATTR_MAGIC 0xEA020000 /* Maximum number of references to one attribute block */ #define EXT2_XATTR_REFCOUNT_MAX 1024 /* Name indexes */ #define EXT2_XATTR_INDEX_USER 1 #define EXT2_XATTR_INDEX_POSIX_ACL_ACCESS 2 #define EXT2_XATTR_INDEX_POSIX_ACL_DEFAULT 3 #define EXT2_XATTR_INDEX_TRUSTED 4 #define EXT2_XATTR_INDEX_LUSTRE 5 #define EXT2_XATTR_INDEX_SECURITY 6 struct ext2_xattr_header { __le32 h_magic; /* magic number for identification */ __le32 h_refcount; /* reference count */ __le32 h_blocks; /* number of disk blocks used */ __le32 h_hash; /* hash value of all attributes */ __u32 h_reserved[4]; /* zero right now */ }; struct ext2_xattr_entry { __u8 e_name_len; /* length of name */ __u8 e_name_index; /* attribute name index */ __le16 e_value_offs; /* offset in disk block of value */ __le32 e_value_block; /* disk block attribute is stored on (n/i) */ __le32 e_value_size; /* size of attribute value */ __le32 e_hash; /* hash value of name and value */ char e_name[0]; /* attribute name */ }; #define EXT2_XATTR_PAD_BITS 2 #define EXT2_XATTR_PAD (1<<EXT2_XATTR_PAD_BITS) #define EXT2_XATTR_ROUND (EXT2_XATTR_PAD-1) #define EXT2_XATTR_LEN(name_len) \ (((name_len) + EXT2_XATTR_ROUND + \ sizeof(struct ext2_xattr_entry)) & ~EXT2_XATTR_ROUND) #define EXT2_XATTR_NEXT(entry) \ ( (struct ext2_xattr_entry *)( \ (char *)(entry) + EXT2_XATTR_LEN((entry)->e_name_len)) ) #define EXT2_XATTR_SIZE(size) \ (((size) + EXT2_XATTR_ROUND) & ~EXT2_XATTR_ROUND) # ifdef CONFIG_EXT2_FS_XATTR extern const struct xattr_handler ext2_xattr_user_handler; extern const struct xattr_handler ext2_xattr_trusted_handler; extern const struct xattr_handler ext2_xattr_acl_access_handler; extern const struct xattr_handler ext2_xattr_acl_default_handler; extern const struct xattr_handler ext2_xattr_security_handler; extern ssize_t ext2_listxattr(struct dentry *, char *, size_t); extern int ext2_xattr_get(struct inode *, int, const char *, void *, size_t); extern int ext2_xattr_set(struct inode *, int, const char *, const void *, size_t, int); extern void ext2_xattr_delete_inode(struct inode *); extern void ext2_xattr_put_super(struct super_block *); extern int init_ext2_xattr(void); extern void exit_ext2_xattr(void); extern const struct xattr_handler *ext2_xattr_handlers[]; # else /* CONFIG_EXT2_FS_XATTR */ static inline int ext2_xattr_get(struct inode *inode, int name_index, const char *name, void *buffer, size_t size) { return -EOPNOTSUPP; } static inline int ext2_xattr_set(struct inode *inode, int name_index, const char *name, const void *value, size_t size, int flags) { return -EOPNOTSUPP; } static inline void ext2_xattr_delete_inode(struct inode *inode) { } static inline void ext2_xattr_put_super(struct super_block *sb) { } static inline int init_ext2_xattr(void) { return 0; } static inline void exit_ext2_xattr(void) { } #define ext2_xattr_handlers NULL # endif /* CONFIG_EXT2_FS_XATTR */ #ifdef CONFIG_EXT2_FS_SECURITY extern int ext2_init_security(struct inode *inode, struct inode *dir, const struct qstr *qstr); #else static inline int ext2_init_security(struct inode *inode, struct inode *dir, const struct qstr *qstr) { return 0; } #endif |