linux-kernel - [PATCH 27/32] union-mount: Always create topmost directory on open

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Date:	Mon, 18 May 2009 18:09:23 +0200
From:	Jan Blunck <jblunck@...e.de>
To:	linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org
Cc:	viro@...iv.linux.org.uk, bharata@...ibm.com, dwmw2@...radead.org,
	mszeredi@...e.cz, vaurora@...hat.com
Subject: [PATCH 27/32] union-mount: Always create topmost directory on open

From: Valerie Aurora (Henson) <vaurora@...hat.com>

When we open a directory, unconditionally create a matching directory
on the top-level.  This way we don't have to go back and create all
the directories on the path to an element when we want to copy it up.

Signed-off-by: Jan Blunck <jblunck@...e.de>
Signed-off-by: Valerie Aurora (Henson) <vaurora@...hat.com>
---
 fs/namei.c |   10 ++++++----
 1 files changed, 6 insertions(+), 4 deletions(-)

diff --git a/fs/namei.c b/fs/namei.c
index 4d68597..684619c 100644
--- a/fs/namei.c
+++ b/fs/namei.c
@@ -1265,8 +1265,9 @@ static int __link_path_walk(const char *name, struct nameidata *nd)
 		if (err)
 			break;
 
-		if ((nd->flags & LOOKUP_TOPMOST) &&
-		    (nd->um_flags & LAST_LOWLEVEL)) {
+		if ((nd->um_flags & LAST_LOWLEVEL) &&
+		    (S_ISDIR(next.dentry->d_inode->i_mode) ||
+		     (nd->flags & LOOKUP_TOPMOST))) {
 			struct dentry *dentry;
 
 			dentry = union_create_topmost(nd, &this, &next);
@@ -1330,8 +1331,9 @@ last_component:
 		if (err)
 			break;
 
-		if ((nd->flags & LOOKUP_TOPMOST) &&
-		    (nd->um_flags & LAST_LOWLEVEL)) {
+		if ((nd->um_flags & LAST_LOWLEVEL) &&
+		    (S_ISDIR(next.dentry->d_inode->i_mode) ||
+		     (nd->flags & LOOKUP_TOPMOST))) {
 			struct dentry *dentry;
 
 			dentry = union_create_topmost(nd, &this, &next);
-- 
1.6.1.3

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