1 files changed, 145 insertions, 0 deletions

diff --git a/fs/ext4/xattr.h b/fs/ext4/xattr.h
new file mode 100644
index 000000000000..79432b35398f
--- /dev/null
+++ b/fs/ext4/xattr.h
@@ -0,0 +1,145 @@
+/*
+  File: fs/ext4/xattr.h
+
+  On-disk format of extended attributes for the ext4 filesystem.
+
+  (C) 2001 Andreas Gruenbacher, <a.gruenbacher@computer.org>
+*/
+
+#include <linux/xattr.h>
+
+/* Magic value in attribute blocks */
+#define EXT4_XATTR_MAGIC                0xEA020000
+
+/* Maximum number of references to one attribute block */
+#define EXT4_XATTR_REFCOUNT_MAX         1024
+
+/* Name indexes */
+#define EXT4_XATTR_INDEX_USER                   1
+#define EXT4_XATTR_INDEX_POSIX_ACL_ACCESS       2
+#define EXT4_XATTR_INDEX_POSIX_ACL_DEFAULT      3
+#define EXT4_XATTR_INDEX_TRUSTED                4
+#define EXT4_XATTR_INDEX_LUSTRE                 5
+#define EXT4_XATTR_INDEX_SECURITY               6
+
+struct ext4_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 ext4_xattr_ibody_header {
+        __le32  h_magic;        /* magic number for identification */
+};
+
+struct ext4_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 EXT4_XATTR_PAD_BITS             2
+#define EXT4_XATTR_PAD          (1<<EXT4_XATTR_PAD_BITS)
+#define EXT4_XATTR_ROUND                (EXT4_XATTR_PAD-1)
+#define EXT4_XATTR_LEN(name_len) \
+        (((name_len) + EXT4_XATTR_ROUND + \
+        sizeof(struct ext4_xattr_entry)) & ~EXT4_XATTR_ROUND)
+#define EXT4_XATTR_NEXT(entry) \
+        ( (struct ext4_xattr_entry *)( \
+          (char *)(entry) + EXT4_XATTR_LEN((entry)->e_name_len)) )
+#define EXT4_XATTR_SIZE(size) \
+        (((size) + EXT4_XATTR_ROUND) & ~EXT4_XATTR_ROUND)
+
+# ifdef CONFIG_EXT4DEV_FS_XATTR
+
+extern struct xattr_handler ext4_xattr_user_handler;
+extern struct xattr_handler ext4_xattr_trusted_handler;
+extern struct xattr_handler ext4_xattr_acl_access_handler;
+extern struct xattr_handler ext4_xattr_acl_default_handler;
+extern struct xattr_handler ext4_xattr_security_handler;
+
+extern ssize_t ext4_listxattr(struct dentry *, char *, size_t);
+
+extern int ext4_xattr_get(struct inode *, int, const char *, void *, size_t);
+extern int ext4_xattr_list(struct inode *, char *, size_t);
+extern int ext4_xattr_set(struct inode *, int, const char *, const void *, size_t, int);
+extern int ext4_xattr_set_handle(handle_t *, struct inode *, int, const char *, const void *, size_t, int);
+
+extern void ext4_xattr_delete_inode(handle_t *, struct inode *);
+extern void ext4_xattr_put_super(struct super_block *);
+
+extern int init_ext4_xattr(void);
+extern void exit_ext4_xattr(void);
+
+extern struct xattr_handler *ext4_xattr_handlers[];
+
+# else  /* CONFIG_EXT4DEV_FS_XATTR */
+
+static inline int
+ext4_xattr_get(struct inode *inode, int name_index, const char *name,
+               void *buffer, size_t size, int flags)
+{
+        return -EOPNOTSUPP;
+}
+
+static inline int
+ext4_xattr_list(struct inode *inode, void *buffer, size_t size)
+{
+        return -EOPNOTSUPP;
+}
+
+static inline int
+ext4_xattr_set(struct inode *inode, int name_index, const char *name,
+               const void *value, size_t size, int flags)
+{
+        return -EOPNOTSUPP;
+}
+
+static inline int
+ext4_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
+ext4_xattr_delete_inode(handle_t *handle, struct inode *inode)
+{
+}
+
+static inline void
+ext4_xattr_put_super(struct super_block *sb)
+{
+}
+
+static inline int
+init_ext4_xattr(void)
+{
+        return 0;
+}
+
+static inline void
+exit_ext4_xattr(void)
+{
+}
+
+#define ext4_xattr_handlers     NULL
+
+# endif  /* CONFIG_EXT4DEV_FS_XATTR */
+
+#ifdef CONFIG_EXT4DEV_FS_SECURITY
+extern int ext4_init_security(handle_t *handle, struct inode *inode,
+                                struct inode *dir);
+#else
+static inline int ext4_init_security(handle_t *handle, struct inode *inode,
+                                struct inode *dir)
+{
+        return 0;
+}
+#endif