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[PATCH] ncpfs: fix rmdir returns Device or resource busy

To: linux-fsdevel@xxxxxxxxxxxxxxx
Subject: [PATCH] ncpfs: fix rmdir returns Device or resource busy
From: Jan Kara <jack@xxxxxxx>
Date: Fri, 10 Oct 2014 16:23:27 +0200
Cc: linux-ext4@xxxxxxxxxxxxxxx, Dave Chinner <david@xxxxxxxxxxxxx>, xfs@xxxxxxxxxxx, cluster-devel@xxxxxxxxxx, Steven Whitehouse <swhiteho@xxxxxxxxxx>, Mark Fasheh <mfasheh@xxxxxxxx>, Joel Becker <jlbec@xxxxxxxxxxxx>, ocfs2-devel@xxxxxxxxxxxxxx, reiserfs-devel@xxxxxxxxxxxxxxx, Jeff Mahoney <jeffm@xxxxxxx>, Dave Kleikamp <shaggy@xxxxxxxxxx>, jfs-discussion@xxxxxxxxxxxxxxxxxxxxx, tytso@xxxxxxx, viro@xxxxxxxxxxxxxxxxxx, Dave Chiluk <chiluk@xxxxxxxxxxxxx>, Petr Vandrovec <petr@xxxxxxxxxxxxxx>
Delivered-to: xfs@xxxxxxxxxxx
In-reply-to: <1412951028-4085-1-git-send-email-jack@xxxxxxx>
References: <1412951028-4085-1-git-send-email-jack@xxxxxxx>
References: bnc#864880
From: Dave Chiluk <chiluk@xxxxxxxxxxxxx>

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@xxxxxxxxxxxxx>
Signed-off-by: Petr Vandrovec <petr@xxxxxxxxxxxxxx>
Signed-off-by: Al Viro <viro@xxxxxxxxxxxxxxxxxx>
Acked-by: Jan Kara <jack@xxxxxxx>
 fs/ncpfs/dir.c | 9 ---------
 1 file changed, 9 deletions(-)

diff --git a/fs/ncpfs/dir.c b/fs/ncpfs/dir.c
index 816326093656..6792ce11f2bf 100644
--- a/fs/ncpfs/dir.c
+++ b/fs/ncpfs/dir.c
@@ -1029,15 +1029,6 @@ static int ncp_rmdir(struct inode *dir, struct dentry 
        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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