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cifs: revalidate mapping when doing direct writes

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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>
This commit is contained in:
Ronnie Sahlberg 2022-09-12 13:04:46 +10:00 committed by Greg Kroah-Hartman
parent 834f4d856f
commit 81081a5c9c
1 changed files with 3 additions and 0 deletions
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3
fs/cifs/file.c
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@ -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);
}