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Linux/fs/ext4/xattr.h

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  1 /*
  2   File: fs/ext4/xattr.h
  3 
  4   On-disk format of extended attributes for the ext4 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 EXT4_XATTR_MAGIC                0xEA020000
 13 
 14 /* Maximum number of references to one attribute block */
 15 #define EXT4_XATTR_REFCOUNT_MAX         1024
 16 
 17 /* Name indexes */
 18 #define EXT4_XATTR_INDEX_USER                   1
 19 #define EXT4_XATTR_INDEX_POSIX_ACL_ACCESS       2
 20 #define EXT4_XATTR_INDEX_POSIX_ACL_DEFAULT      3
 21 #define EXT4_XATTR_INDEX_TRUSTED                4
 22 #define EXT4_XATTR_INDEX_LUSTRE                 5
 23 #define EXT4_XATTR_INDEX_SECURITY               6
 24 
 25 struct ext4_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 ext4_xattr_ibody_header {
 34         __le32  h_magic;        /* magic number for identification */
 35 };
 36 
 37 struct ext4_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 EXT4_XATTR_PAD_BITS             2
 48 #define EXT4_XATTR_PAD          (1<<EXT4_XATTR_PAD_BITS)
 49 #define EXT4_XATTR_ROUND                (EXT4_XATTR_PAD-1)
 50 #define EXT4_XATTR_LEN(name_len) \
 51         (((name_len) + EXT4_XATTR_ROUND + \
 52         sizeof(struct ext4_xattr_entry)) & ~EXT4_XATTR_ROUND)
 53 #define EXT4_XATTR_NEXT(entry) \
 54         ((struct ext4_xattr_entry *)( \
 55          (char *)(entry) + EXT4_XATTR_LEN((entry)->e_name_len)))
 56 #define EXT4_XATTR_SIZE(size) \
 57         (((size) + EXT4_XATTR_ROUND) & ~EXT4_XATTR_ROUND)
 58 
 59 #define IHDR(inode, raw_inode) \
 60         ((struct ext4_xattr_ibody_header *) \
 61                 ((void *)raw_inode + \
 62                 EXT4_GOOD_OLD_INODE_SIZE + \
 63                 EXT4_I(inode)->i_extra_isize))
 64 #define IFIRST(hdr) ((struct ext4_xattr_entry *)((hdr)+1))
 65 
 66 # ifdef CONFIG_EXT4_FS_XATTR
 67 
 68 extern const struct xattr_handler ext4_xattr_user_handler;
 69 extern const struct xattr_handler ext4_xattr_trusted_handler;
 70 extern const struct xattr_handler ext4_xattr_acl_access_handler;
 71 extern const struct xattr_handler ext4_xattr_acl_default_handler;
 72 extern const struct xattr_handler ext4_xattr_security_handler;
 73 
 74 extern ssize_t ext4_listxattr(struct dentry *, char *, size_t);
 75 
 76 extern int ext4_xattr_get(struct inode *, int, const char *, void *, size_t);
 77 extern int ext4_xattr_set(struct inode *, int, const char *, const void *, size_t, int);
 78 extern int ext4_xattr_set_handle(handle_t *, struct inode *, int, const char *, const void *, size_t, int);
 79 
 80 extern void ext4_xattr_delete_inode(handle_t *, struct inode *);
 81 extern void ext4_xattr_put_super(struct super_block *);
 82 
 83 extern int ext4_expand_extra_isize_ea(struct inode *inode, int new_extra_isize,
 84                             struct ext4_inode *raw_inode, handle_t *handle);
 85 
 86 extern int __init ext4_init_xattr(void);
 87 extern void ext4_exit_xattr(void);
 88 
 89 extern const struct xattr_handler *ext4_xattr_handlers[];
 90 
 91 # else  /* CONFIG_EXT4_FS_XATTR */
 92 
 93 static inline int
 94 ext4_xattr_get(struct inode *inode, int name_index, const char *name,
 95                void *buffer, size_t size, int flags)
 96 {
 97         return -EOPNOTSUPP;
 98 }
 99 
100 static inline int
101 ext4_xattr_set(struct inode *inode, int name_index, const char *name,
102                const void *value, size_t size, int flags)
103 {
104         return -EOPNOTSUPP;
105 }
106 
107 static inline int
108 ext4_xattr_set_handle(handle_t *handle, struct inode *inode, int name_index,
109                const char *name, const void *value, size_t size, int flags)
110 {
111         return -EOPNOTSUPP;
112 }
113 
114 static inline void
115 ext4_xattr_delete_inode(handle_t *handle, struct inode *inode)
116 {
117 }
118 
119 static inline void
120 ext4_xattr_put_super(struct super_block *sb)
121 {
122 }
123 
124 static __init inline int
125 ext4_init_xattr(void)
126 {
127         return 0;
128 }
129 
130 static inline void
131 ext4_exit_xattr(void)
132 {
133 }
134 
135 static inline int
136 ext4_expand_extra_isize_ea(struct inode *inode, int new_extra_isize,
137                             struct ext4_inode *raw_inode, handle_t *handle)
138 {
139         return -EOPNOTSUPP;
140 }
141 
142 #define ext4_xattr_handlers     NULL
143 
144 # endif  /* CONFIG_EXT4_FS_XATTR */
145 
146 #ifdef CONFIG_EXT4_FS_SECURITY
147 extern int ext4_init_security(handle_t *handle, struct inode *inode,
148                               struct inode *dir, const struct qstr *qstr);
149 #else
150 static inline int ext4_init_security(handle_t *handle, struct inode *inode,
151                                      struct inode *dir, const struct qstr *qstr)
152 {
153         return 0;
154 }
155 #endif
156 

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