linux-kernel - [PATCH 46/73] union-mount: Follow mount in __lookup

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Message-ID: <20120221180315.25235.54661.stgit@warthog.procyon.org.uk>
Date:	Tue, 21 Feb 2012 18:03:15 +0000
From:	David Howells <dhowells@...hat.com>
To:	linux-fsdevel@...r.kernel.org, viro@...IV.linux.org.uk,
	valerie.aurora@...il.com
Cc:	linux-kernel@...r.kernel.org, David Howells <dhowells@...hat.com>
Subject: [PATCH 46/73] union-mount: Follow mount in __lookup_union() [ver #2]

From: Valerie Aurora <vaurora@...hat.com>

In order for read-only layers of a union to have submounts, we have to
follow mounts on directories in union lookup.

Original-author: Valerie Aurora <vaurora@...hat.com>
Signed-off-by: David Howells <dhowells@...hat.com>
---

 fs/namei.c |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)

diff --git a/fs/namei.c b/fs/namei.c
index 3ac07be..37e32b4 100644
--- a/fs/namei.c
+++ b/fs/namei.c
@@ -1195,6 +1195,8 @@ static int __lookup_union(struct nameidata *nd, struct qstr *name,
 		 * layer's directory to the union stack for the topmost
 		 * directory.
 		 */
+		follow_mount(&lower);
+
 		if (!topmost->dentry->d_inode) {
 			err = union_create_topmost_dir(&parent, name, topmost,
 						       &lower);

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