From mboxrd@z Thu Jan 1 00:00:00 1970 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=-20.4 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=unavailable 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 551E9C07E9B for ; Tue, 6 Jul 2021 11:21:25 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 3B3EC61DA8 for ; Tue, 6 Jul 2021 11:21:25 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234205AbhGFLYC (ORCPT ); Tue, 6 Jul 2021 07:24:02 -0400 Received: from mail.kernel.org ([198.145.29.99]:54440 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232542AbhGFLS3 (ORCPT ); Tue, 6 Jul 2021 07:18:29 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id C93DE61C28; Tue, 6 Jul 2021 11:15:50 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1625570151; bh=shD/dtpzmLlRN3eevtwaao4gYZqp1iic4C5S5c6TrC0=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=fYHbjeIfX1Vbpu7dzd73KQmVapjH2UYyvkXEbcvtPYFsPxe9um+GGHkAi3fg/uFwp YWrpHvDuF3WoDlM+Fh/bzVHz5hLDVN3KQlHJA/9MzbELxprvUggAb16zqJEhhg0tKk QGYO662v37FuhKHkpXFI7YT1JV5gCs8RYUD9kFUSqn9BjbEE+58fGOkeZIgi2zSGFm y4iqbwh1LVKN1dlPggg9DKVKOv2TAxdXBHcOj2CsQLEXrZYf8r9nsCRIJ6LNrjPVYo HGtTj1xfKLcOygD57YzROS8uHcBPLeZJzfp806e8vdmKg8PaZJdmBZTd96n90EF5Vl h1Dut0d4qTLOg== From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Joe Thornber , Mike Snitzer , Sasha Levin , dm-devel@redhat.com Subject: [PATCH AUTOSEL 5.13 074/189] dm space maps: don't reset space map allocation cursor when committing Date: Tue, 6 Jul 2021 07:12:14 -0400 Message-Id: <20210706111409.2058071-74-sashal@kernel.org> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20210706111409.2058071-1-sashal@kernel.org> References: <20210706111409.2058071-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Joe Thornber [ Upstream commit 5faafc77f7de69147d1e818026b9a0cbf036a7b2 ] Current commit code resets the place where the search for free blocks will begin back to the start of the metadata device. There are a couple of repercussions to this: - The first allocation after the commit is likely to take longer than normal as it searches for a free block in an area that is likely to have very few free blocks (if any). - Any free blocks it finds will have been recently freed. Reusing them means we have fewer old copies of the metadata to aid recovery from hardware error. Fix these issues by leaving the cursor alone, only resetting when the search hits the end of the metadata device. Signed-off-by: Joe Thornber Signed-off-by: Mike Snitzer Signed-off-by: Sasha Levin --- drivers/md/persistent-data/dm-space-map-disk.c | 9 ++++++++- drivers/md/persistent-data/dm-space-map-metadata.c | 9 ++++++++- 2 files changed, 16 insertions(+), 2 deletions(-) diff --git a/drivers/md/persistent-data/dm-space-map-disk.c b/drivers/md/persistent-data/dm-space-map-disk.c index 61f56909e00b..4f8069bb0481 100644 --- a/drivers/md/persistent-data/dm-space-map-disk.c +++ b/drivers/md/persistent-data/dm-space-map-disk.c @@ -171,6 +171,14 @@ static int sm_disk_new_block(struct dm_space_map *sm, dm_block_t *b) * Any block we allocate has to be free in both the old and current ll. */ r = sm_ll_find_common_free_block(&smd->old_ll, &smd->ll, smd->begin, smd->ll.nr_blocks, b); + if (r == -ENOSPC) { + /* + * There's no free block between smd->begin and the end of the metadata device. + * We search before smd->begin in case something has been freed. + */ + r = sm_ll_find_common_free_block(&smd->old_ll, &smd->ll, 0, smd->begin, b); + } + if (r) return r; @@ -194,7 +202,6 @@ static int sm_disk_commit(struct dm_space_map *sm) return r; memcpy(&smd->old_ll, &smd->ll, sizeof(smd->old_ll)); - smd->begin = 0; smd->nr_allocated_this_transaction = 0; return 0; diff --git a/drivers/md/persistent-data/dm-space-map-metadata.c b/drivers/md/persistent-data/dm-space-map-metadata.c index 9e3c64ec2026..da439ac85796 100644 --- a/drivers/md/persistent-data/dm-space-map-metadata.c +++ b/drivers/md/persistent-data/dm-space-map-metadata.c @@ -452,6 +452,14 @@ static int sm_metadata_new_block_(struct dm_space_map *sm, dm_block_t *b) * Any block we allocate has to be free in both the old and current ll. */ r = sm_ll_find_common_free_block(&smm->old_ll, &smm->ll, smm->begin, smm->ll.nr_blocks, b); + if (r == -ENOSPC) { + /* + * There's no free block between smm->begin and the end of the metadata device. + * We search before smm->begin in case something has been freed. + */ + r = sm_ll_find_common_free_block(&smm->old_ll, &smm->ll, 0, smm->begin, b); + } + if (r) return r; @@ -503,7 +511,6 @@ static int sm_metadata_commit(struct dm_space_map *sm) return r; memcpy(&smm->old_ll, &smm->ll, sizeof(smm->old_ll)); - smm->begin = 0; smm->allocated_this_transaction = 0; return 0; -- 2.30.2