From nobody Fri Dec 19 15:46:21 2025 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 81FAFC3A59D for ; Sat, 22 Oct 2022 07:34:58 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230251AbiJVHey (ORCPT ); Sat, 22 Oct 2022 03:34:54 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:47900 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230164AbiJVHed (ORCPT ); Sat, 22 Oct 2022 03:34:33 -0400 Received: from dfw.source.kernel.org (dfw.source.kernel.org [139.178.84.217]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 0B7E926561; Sat, 22 Oct 2022 00:34:26 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id 8752860A5C; Sat, 22 Oct 2022 07:34:25 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 8ABB4C433C1; Sat, 22 Oct 2022 07:34:24 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1666424065; bh=CObaSo7Y/jwaBtljqRsg6xczal4y423u8EiZaZKe4sY=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=Wn8jEu899xwfYwJcqc0YNOlvXbwdJfkFyiJfi5mnzUEF3gjXfvnUrvfUCOOQ4dtqO eFzONSrUkALiYxd1BlglBLHcCE0ygI4HLDGhaKQ/3+vvqgGl6Zx5e3bqhrwgJ5G9uv zbugEYXlHLLJlcYqMbqwRN8GaM4SWeqcywN0B4C0= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, "Paulo Alcantara (SUSE)" , Enzo Matsumiya , Ronnie Sahlberg , Steve French Subject: [PATCH 5.19 017/717] cifs: destage dirty pages before re-reading them for cache=none Date: Sat, 22 Oct 2022 09:18:16 +0200 Message-Id: <20221022072418.117632497@linuxfoundation.org> X-Mailer: git-send-email 2.38.1 In-Reply-To: <20221022072415.034382448@linuxfoundation.org> References: <20221022072415.034382448@linuxfoundation.org> User-Agent: quilt/0.67 MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" From: Ronnie Sahlberg commit bb44c31cdcac107344dd2fcc3bd0504a53575c51 upstream. This is the opposite case of kernel bugzilla 216301. If we mmap a file using cache=3Dnone and then proceed to update the mmapped area these updates are not reflected in a later pread() of that part of the file. To fix this we must first destage any dirty pages in the range before we allow the pread() to proceed. Cc: stable@vger.kernel.org Reviewed-by: Paulo Alcantara (SUSE) Reviewed-by: Enzo Matsumiya Signed-off-by: Ronnie Sahlberg Signed-off-by: Steve French Signed-off-by: Greg Kroah-Hartman --- fs/cifs/file.c | 9 +++++++++ 1 file changed, 9 insertions(+) --- a/fs/cifs/file.c +++ b/fs/cifs/file.c @@ -4024,6 +4024,15 @@ static ssize_t __cifs_readv( len =3D ctx->len; } =20 + if (direct) { + rc =3D filemap_write_and_wait_range(file->f_inode->i_mapping, + offset, offset + len - 1); + if (rc) { + kref_put(&ctx->refcount, cifs_aio_ctx_release); + return -EAGAIN; + } + } + /* grab a lock here due to read response handlers can access ctx */ mutex_lock(&ctx->aio_mutex);