From: Ronnie Sahlberg <lsahlber@redhat.com>
Date: Mon, 12 Sep 2022 03:04:46 +0000 (+1000)
Subject: cifs: revalidate mapping when doing direct writes
X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=7500a99281dfed2d4a84771c933bcb9e17af279b;p=linux.git

cifs: revalidate mapping when doing direct writes

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>
---

diff --git a/fs/cifs/file.c b/fs/cifs/file.c
index fa738adc031f7..6f38b134a3468 100644
--- a/fs/cifs/file.c
+++ b/fs/cifs/file.c
@@ -3575,6 +3575,9 @@ 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);
 }