linux-kernel - [PATCH 31/34] union-mount: Follow mount in __lookup

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Date:	Thu, 16 Sep 2010 15:12:22 -0700
From:	Valerie Aurora <vaurora@...hat.com>
To:	Alexander Viro <viro@...iv.linux.org.uk>
Cc:	Miklos Szeredi <miklos@...redi.hu>,
	Christoph Hellwig <hch@...radead.org>,
	Andreas Gruenbacher <agruen@...e.de>,
	Nick Piggin <npiggin@...nel.dk>, linux-kernel@...r.kernel.org,
	linux-fsdevel@...r.kernel.org, Valerie Aurora <vaurora@...hat.com>
Subject: [PATCH 31/34] union-mount: Follow mount in __lookup_union()

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

Signed-off-by: Valerie Aurora <vaurora@...hat.com>
---
 fs/namei.c |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)

diff --git a/fs/namei.c b/fs/namei.c
index 0041334..cdff001 100644
--- a/fs/namei.c
+++ b/fs/namei.c
@@ -811,6 +811,8 @@ static int __lookup_union(struct nameidata *nd, struct qstr *name,
 			goto out_found_file;
 		}
 
+		follow_mount(&lower);
+
 		/*
 		 * Now we know the target is a directory.  Create a
 		 * matching topmost directory if one doesn't already
-- 
1.6.3.3

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