cifs: revalidate mapping when doing direct writes

commit 7500a99281dfed2d4a84771c933bcb9e17af279b upstream.

Kernel bugzilla: 216301

When doing direct writes we need to also invalidate the mapping in case
we have a cached copy of the affected page(s) in memory or else
subsequent reads of the data might return the old/stale content
before we wrote an update to the server.

Cc: stable@vger.kernel.org
Reviewed-by: Paulo Alcantara (SUSE) <pc@cjr.nz>
Signed-off-by: Ronnie Sahlberg <lsahlber@redhat.com>
Signed-off-by: Steve French <stfrench@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/fs/cifs/file.c b/fs/cifs/file.c
index 3015a8b20bd9915cd54b2980c02924a55e66d988..2ef57bc054d2f518ce1940718eddb9d99023ae9c 100644 (file)
--- a/fs/cifs/file.c
+++ b/fs/cifs/file.c
@@ -3318,6 +3318,9 @@ static ssize_t __cifs_writev(
 
 ssize_t cifs_direct_writev(struct kiocb *iocb, struct iov_iter *from)
 {
+       struct file *file = iocb->ki_filp;
+
+       cifs_revalidate_mapping(file->f_inode);
        return __cifs_writev(iocb, from, true);
 }