xattr: define vfs_getxattr_alloc and vfs_xattr_cmp

vfs_getxattr_alloc() and vfs_xattr_cmp() are two new kernel xattr helper
functions.  vfs_getxattr_alloc() first allocates memory for the requested
xattr and then retrieves it. vfs_xattr_cmp() compares a given value with
the contents of an extended attribute.

Signed-off-by: Mimi Zohar <zohar@us.ibm.com>
Acked-by: Serge Hallyn <serge.hallyn@ubuntu.com>

1 files changed, 4 insertions, 1 deletions

diff --git a/include/linux/xattr.h b/include/linux/xattr.h
index 7a378662ddff..4703f6bd1f53 100644
--- a/include/linux/xattr.h
+++ b/include/linux/xattr.h
@@ -84,7 +84,10 @@ ssize_t generic_getxattr(struct dentry *dentry, const char *name, void *buffer,
 ssize_t generic_listxattr(struct dentry *dentry, char *buffer, size_t buffer_size);
 int generic_setxattr(struct dentry *dentry, const char *name, const void *value, size_t size, int flags);
 int generic_removexattr(struct dentry *dentry, const char *name);
-
+ssize_t vfs_getxattr_alloc(struct dentry *dentry, const char *name,
+                           char **xattr_value, size_t size, gfp_t flags);
+int vfs_xattr_cmp(struct dentry *dentry, const char *xattr_name,
+                  const char *value, size_t size, gfp_t flags);
 #endif  /*  __KERNEL__  */
 
 #endif  /* _LINUX_XATTR_H */