linux-kernel - [26/26] ncpfs: fix rmdir returns Device or resource busy

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Message-ID: <lsq.1372214159.879690280@decadent.org.uk>
Date:	Wed, 26 Jun 2013 03:35:59 +0100
From:	Ben Hutchings <ben@...adent.org.uk>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:	akpm@...ux-foundation.org, "Dave Chiluk" <chiluk@...onical.com>,
	"Petr Vandrovec" <petr@...drovec.name>,
	"Al Viro" <viro@...iv.linux.org.uk>
Subject: [26/26] ncpfs: fix rmdir returns Device or resource busy

3.2.48-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Dave Chiluk <chiluk@...onical.com>

commit 698b8223631472bf982ed570b0812faa61955683 upstream.

1d2ef5901483004d74947bbf78d5146c24038fe7 caused a regression in ncpfs such that
directories could no longer be removed.  This was because ncp_rmdir checked
to see if a dentry could be unhashed before allowing it to be removed. Since
1d2ef5901483004d74947bbf78d5146c24038fe7 introduced a change that incremented
dentry->d_count causing it to always be greater than 1 unhash would always
fail.  Thus causing the error path in ncp_rmdir to always be taken.  Removing
this error path is safe as unhashing is still accomplished by calls to dput
from vfs_rmdir.

Signed-off-by: Dave Chiluk <chiluk@...onical.com>
Signed-off-by: Petr Vandrovec <petr@...drovec.name>
Signed-off-by: Al Viro <viro@...iv.linux.org.uk>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 fs/ncpfs/dir.c |    9 ---------
 1 file changed, 9 deletions(-)

--- a/fs/ncpfs/dir.c
+++ b/fs/ncpfs/dir.c
@@ -1033,15 +1033,6 @@ static int ncp_rmdir(struct inode *dir,
 	DPRINTK("ncp_rmdir: removing %s/%s\n",
 		dentry->d_parent->d_name.name, dentry->d_name.name);
 
-	/*
-	 * fail with EBUSY if there are still references to this
-	 * directory.
-	 */
-	dentry_unhash(dentry);
-	error = -EBUSY;
-	if (!d_unhashed(dentry))
-		goto out;
-
 	len = sizeof(__name);
 	error = ncp_io2vol(server, __name, &len, dentry->d_name.name,
 			   dentry->d_name.len, !ncp_preserve_case(dir));

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