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, <a.gruenbacher@computer.org> 7*/ 8 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 25struct 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 33struct ext3_xattr_ibody_header { 34 __le32 h_magic; /* magic number for identification */ 35}; 36 37struct 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 61extern const struct xattr_handler ext3_xattr_user_handler; 62extern const struct xattr_handler ext3_xattr_trusted_handler; 63extern const struct xattr_handler ext3_xattr_acl_access_handler; 64extern const struct xattr_handler ext3_xattr_acl_default_handler; 65extern const struct xattr_handler ext3_xattr_security_handler; 66 67extern ssize_t ext3_listxattr(struct dentry *, char *, size_t); 68 69extern int ext3_xattr_get(struct inode *, int, const char *, void *, size_t); 70extern int ext3_xattr_set(struct inode *, int, const char *, const void *, size_t, int); 71extern int ext3_xattr_set_handle(handle_t *, struct inode *, int, const char *, const void *, size_t, int); 72 73extern void ext3_xattr_delete_inode(handle_t *, struct inode *); 74extern void ext3_xattr_put_super(struct super_block *); 75 76extern int init_ext3_xattr(void); 77extern void exit_ext3_xattr(void); 78 79extern const struct xattr_handler *ext3_xattr_handlers[]; 80 81# else /* CONFIG_EXT3_FS_XATTR */ 82 83static inline int 84ext3_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 90static inline int 91ext3_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 97static inline int 98ext3_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 104static inline void 105ext3_xattr_delete_inode(handle_t *handle, struct inode *inode) 106{ 107} 108 109static inline void 110ext3_xattr_put_super(struct super_block *sb) 111{ 112} 113 114static inline int 115init_ext3_xattr(void) 116{ 117 return 0; 118} 119 120static inline void 121exit_ext3_xattr(void) 122{ 123} 124 125#define ext3_xattr_handlers NULL 126 127# endif /* CONFIG_EXT3_FS_XATTR */ 128 129#ifdef CONFIG_EXT3_FS_SECURITY 130extern int ext3_init_security(handle_t *handle, struct inode *inode, 131 struct inode *dir); 132#else 133static inline int ext3_init_security(handle_t *handle, struct inode *inode, 134 struct inode *dir) 135{ 136 return 0; 137} 138#endif 139