From: Ronnie Sahlberg lsahlber@redhat.com
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 --- fs/cifs/file.c | 3 +++ 1 file changed, 3 insertions(+)
--- a/fs/cifs/file.c +++ b/fs/cifs/file.c @@ -3244,6 +3244,9 @@ 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); }