userns: rename is_owner_or_cap to inode_owner_or_capable

And give it a kernel-doc comment.

[akpm@linux-foundation.org: btrfs changed in linux-next]
Signed-off-by: Serge E. Hallyn <serge.hallyn@canonical.com>
Cc: "Eric W. Biederman" <ebiederm@xmission.com>
Cc: Daniel Lezcano <daniel.lezcano@free.fr>
Acked-by: David Howells <dhowells@redhat.com>
Cc: James Morris <jmorris@namei.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/fs/ext2/acl.c b/fs/ext2/acl.c
index 7b41805..abea5a1 100644
--- a/fs/ext2/acl.c
+++ b/fs/ext2/acl.c
@@ -406,7 +406,7 @@
 		return -EINVAL;
 	if (!test_opt(dentry->d_sb, POSIX_ACL))
 		return -EOPNOTSUPP;
-	if (!is_owner_or_cap(dentry->d_inode))
+	if (!inode_owner_or_capable(dentry->d_inode))
 		return -EPERM;
 
 	if (value) {