From patchwork Thu Jul 15 18:39:55 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Greg KH X-Patchwork-Id: 477931 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-19.4 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER, INCLUDES_PATCH, MAILING_LIST_MULTI, SPF_HELO_NONE, SPF_PASS, USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id A7F70C636CA for ; Thu, 15 Jul 2021 19:15:42 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 92537613E9 for ; Thu, 15 Jul 2021 19:15:42 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S244843AbhGOTSf (ORCPT ); Thu, 15 Jul 2021 15:18:35 -0400 Received: from mail.kernel.org ([198.145.29.99]:58176 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S242862AbhGOTRN (ORCPT ); Thu, 15 Jul 2021 15:17:13 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id 0560F613E9; Thu, 15 Jul 2021 19:12:46 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1626376367; bh=TywS3+8OR6jJVRM/MIr9EVIcjLg13f71Y5+XN6BhK9g=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=Hc129YW6UMHbRDuRbXfcDPAlIs7Jl6fGBa5/dkQBgKuMj4IZOX00Yw/2RtC6586o4 9Mj87NvmvBCDVy4hs6iJN75bg9btKh60E7H8EpDvtgLXY2/BGYRoieCtuT3/OSYxnR ZX1txo9+7EojeeE6ntijktbh51oA0atXH5iALyW8= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Mikulas Patocka , Mike Snitzer Subject: [PATCH 5.13 240/266] dm writecache: flush origin device when writing and cache is full Date: Thu, 15 Jul 2021 20:39:55 +0200 Message-Id: <20210715182650.997401987@linuxfoundation.org> X-Mailer: git-send-email 2.32.0 In-Reply-To: <20210715182613.933608881@linuxfoundation.org> References: <20210715182613.933608881@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Mikulas Patocka commit ee55b92a7391bf871939330f662651b54be51b73 upstream. Commit d53f1fafec9d086f1c5166436abefdaef30e0363 ("dm writecache: do direct write if the cache is full") changed dm-writecache, so that it writes directly to the origin device if the cache is full. Unfortunately, it doesn't forward flush requests to the origin device, so that there is a bug where flushes are being ignored. Fix this by adding missing flush forwarding. For PMEM mode, we fix this bug by disabling direct writes to the origin device, because it performs better. Signed-off-by: Mikulas Patocka Fixes: d53f1fafec9d ("dm writecache: do direct write if the cache is full") Cc: stable@vger.kernel.org # v5.7+ Signed-off-by: Mike Snitzer Signed-off-by: Greg Kroah-Hartman --- drivers/md/dm-writecache.c | 8 ++++++-- 1 file changed, 6 insertions(+), 2 deletions(-) --- a/drivers/md/dm-writecache.c +++ b/drivers/md/dm-writecache.c @@ -1297,8 +1297,12 @@ static int writecache_map(struct dm_targ writecache_flush(wc); if (writecache_has_error(wc)) goto unlock_error; + if (unlikely(wc->cleaner)) + goto unlock_remap_origin; goto unlock_submit; } else { + if (dm_bio_get_target_bio_nr(bio)) + goto unlock_remap_origin; writecache_offload_bio(wc, bio); goto unlock_return; } @@ -1377,7 +1381,7 @@ read_next_block: } e = writecache_pop_from_freelist(wc, (sector_t)-1); if (unlikely(!e)) { - if (!found_entry) { + if (!WC_MODE_PMEM(wc) && !found_entry) { direct_write: e = writecache_find_entry(wc, bio->bi_iter.bi_sector, WFE_RETURN_FOLLOWING); if (e) { @@ -2481,7 +2485,7 @@ overflow: goto bad; } - ti->num_flush_bios = 1; + ti->num_flush_bios = WC_MODE_PMEM(wc) ? 1 : 2; ti->flush_supported = true; ti->num_discard_bios = 1;