cifs: revalidate mapping when doing direct writes
authorRonnie Sahlberg <lsahlber@redhat.com>
Mon, 12 Sep 2022 03:04:46 +0000 (13:04 +1000)
committerSteve French <stfrench@microsoft.com>
Mon, 12 Sep 2022 18:24:08 +0000 (13:24 -0500)
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>
fs/cifs/file.c

index fa738ad..6f38b13 100644 (file)
@@ -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);
 }