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Linux/fs/ext3/xattr.h

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  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 
 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 
 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_security_handler;
 64 
 65 extern ssize_t ext3_listxattr(struct dentry *, char *, size_t);
 66 
 67 extern int ext3_xattr_get(struct inode *, int, const char *, void *, size_t);
 68 extern int ext3_xattr_set(struct inode *, int, const char *, const void *, size_t, int);
 69 extern int ext3_xattr_set_handle(handle_t *, struct inode *, int, const char *, const void *, size_t, int);
 70 
 71 extern void ext3_xattr_delete_inode(handle_t *, struct inode *);
 72 extern void ext3_xattr_put_super(struct super_block *);
 73 
 74 extern int init_ext3_xattr(void);
 75 extern void exit_ext3_xattr(void);
 76 
 77 extern const struct xattr_handler *ext3_xattr_handlers[];
 78 
 79 # else  /* CONFIG_EXT3_FS_XATTR */
 80 
 81 static inline int
 82 ext3_xattr_get(struct inode *inode, int name_index, const char *name,
 83                void *buffer, size_t size, int flags)
 84 {
 85         return -EOPNOTSUPP;
 86 }
 87 
 88 static inline int
 89 ext3_xattr_set(struct inode *inode, int name_index, const char *name,
 90                const void *value, size_t size, int flags)
 91 {
 92         return -EOPNOTSUPP;
 93 }
 94 
 95 static inline int
 96 ext3_xattr_set_handle(handle_t *handle, struct inode *inode, int name_index,
 97                const char *name, const void *value, size_t size, int flags)
 98 {
 99         return -EOPNOTSUPP;
100 }
101 
102 static inline void
103 ext3_xattr_delete_inode(handle_t *handle, struct inode *inode)
104 {
105 }
106 
107 static inline void
108 ext3_xattr_put_super(struct super_block *sb)
109 {
110 }
111 
112 static inline int
113 init_ext3_xattr(void)
114 {
115         return 0;
116 }
117 
118 static inline void
119 exit_ext3_xattr(void)
120 {
121 }
122 
123 #define ext3_xattr_handlers     NULL
124 
125 # endif  /* CONFIG_EXT3_FS_XATTR */
126 
127 #ifdef CONFIG_EXT3_FS_SECURITY
128 extern int ext3_init_security(handle_t *handle, struct inode *inode,
129                               struct inode *dir, const struct qstr *qstr);
130 #else
131 static inline int ext3_init_security(handle_t *handle, struct inode *inode,
132                                      struct inode *dir, const struct qstr *qstr)
133 {
134         return 0;
135 }
136 #endif
137 

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