linux-kernel - [PATCH 45/73] union-mount: Build union stack in __lookup

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Date:	Tue, 21 Feb 2012 18:03:07 +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 45/73] union-mount: Build union stack in __lookup_union() [ver
 #2]

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

Build the union stack for directories as we look them up.  Create the
topmost directory if it doesn't exist.

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

 fs/namei.c |   17 +++++++++++++++--
 1 files changed, 15 insertions(+), 2 deletions(-)

diff --git a/fs/namei.c b/fs/namei.c
index f81f24e..3ac07be 100644
--- a/fs/namei.c
+++ b/fs/namei.c
@@ -1190,8 +1190,21 @@ static int __lookup_union(struct nameidata *nd, struct qstr *name,
 			goto out_found_file;
 		}
 
-		/* XXX - do nothing, more in later patches */
-		path_put(&lower);
+		/* Now we know the target is a directory.  Create a matching
+		 * topmost directory if one doesn't already exist, and add this
+		 * layer's directory to the union stack for the topmost
+		 * directory.
+		 */
+		if (!topmost->dentry->d_inode) {
+			err = union_create_topmost_dir(&parent, name, topmost,
+						       &lower);
+			if (err)
+				goto out_err;
+		}
+
+		err = union_add_dir(topmost, &lower, i);
+		if (err)
+			goto out_err;
 	}
 	return 0;
 

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