commit f7a99c5b7c8bd3d3f533c8b38274e33f3da9096e
author Al Viro <viro@zeniv.linux.org.uk> Sat Jun 09 00:59:08 2012 -0400
committer Al Viro <viro@zeniv.linux.org.uk> Sat Jul 14 16:32:47 2012 +0400
tree 5c326c0ddd1f40eacbe2fd7c888f26b089389f99
parent d187663ef24cd3d033f0cbf2867e70b36a3a90b8

get rid of ->mnt_longterm

it's enough to set ->mnt_ns of internal vfsmounts to something
distinct from all struct mnt_namespace out there; then we can
just use the check for ->mnt_ns != NULL in the fast path of
mntput_no_expire()

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

fs/dcache.c

diff --git a/fs/dcache.c b/fs/dcache.c
index 4046904..44acb5b 100644
--- a/fs/dcache.c
+++ b/fs/dcache.c
@@ -2622,7 +2622,7 @@
 	if (!slash)
 		error = prepend(buffer, buflen, "/", 1);
 	if (!error)
-		error = real_mount(vfsmnt)->mnt_ns ? 1 : 2;
+		error = is_mounted(vfsmnt) ? 1 : 2;
 	goto out;
 }