From: Dave Hansen <haveblue@us.ibm.com>

Elevate the write count during the vfs_rmdir() call.

Acked-by: Serge Hallyn <serue@us.ibm.com>
Acked-by: Al Viro <viro@ZenIV.linux.org.uk>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Dave Hansen <haveblue@us.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 fs/namei.c |    5 +++++
 1 file changed, 5 insertions(+)

diff -puN fs/namei.c~r-o-bind-mounts-elevate-write-count-for-vfs_rmdir fs/namei.c
--- a/fs/namei.c~r-o-bind-mounts-elevate-write-count-for-vfs_rmdir
+++ a/fs/namei.c
@@ -2190,7 +2190,12 @@ static long do_rmdir(int dfd, const char
 	error = PTR_ERR(dentry);
 	if (IS_ERR(dentry))
 		goto exit2;
+	error = mnt_want_write(nd.path.mnt);
+	if (error)
+		goto exit3;
 	error = vfs_rmdir(nd.path.dentry->d_inode, dentry);
+	mnt_drop_write(nd.path.mnt);
+exit3:
 	dput(dentry);
 exit2:
 	mutex_unlock(&nd.path.dentry->d_inode->i_mutex);
_