Commit 81081a5c authored Sep 12, 2022 by Ronnie Sahlberg Committed by Greg Kroah-Hartman Sep 28, 2022

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>

parent 834f4d85

fs/cifs/file.c

+3 −0

Original line number	Diff line number	Diff line
		@@ -3194,6 +3194,9 @@ 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);
		}