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=-9.1 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,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 A0A04C282CE for ; Wed, 22 May 2019 19:33:08 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 6E8E82089E for ; Wed, 22 May 2019 19:33:08 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1558553588; bh=mz9JaqIdFott20mW8XiibQZCw4WKHgtW1FXf6JzGZTE=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=lTwx/PXHGvhK7SvojGEcQDKsdhrGahC8ARrENjViQzZVi58JvDrXqP6NuzGAThCYt GJdGxWDdcYxvofQn5K5yinsIIyJbwD7Fk8vp74YRmIXp6jrB2FRAng4oF5XhgikBxp ozIzk8yHirGrlZXpg1AQKYraEKtbb/IaeISbKrr4= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1731366AbfEVTdH (ORCPT ); Wed, 22 May 2019 15:33:07 -0400 Received: from mail.kernel.org ([198.145.29.99]:55606 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2387686AbfEVTb4 (ORCPT ); Wed, 22 May 2019 15:31:56 -0400 Received: from sasha-vm.mshome.net (c-73-47-72-35.hsd1.nh.comcast.net [73.47.72.35]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id DC9972177E; Wed, 22 May 2019 19:31:54 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1558553515; bh=mz9JaqIdFott20mW8XiibQZCw4WKHgtW1FXf6JzGZTE=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=nv9pypP7QUoe57gNbLlqkyNbx0mvbc3j/FEW8d1nWYMaJNBnZqCxgogAtgaDQCqtT IDpr8LG4rUWB70qN30tjgOgVOF5XyZRUti61QkAVsnTL8XQMUWKG4lOykATyBGKPAS zNWs1oxRmmCQd4/vxjhdk2YYMRs+7v4nctOOhKis= From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Tang Junhui , Dennis Schridde , Coly Li , Jens Axboe , Sasha Levin , linux-bcache@vger.kernel.org Subject: [PATCH AUTOSEL 4.4 19/92] bcache: fix failure in journal relplay Date: Wed, 22 May 2019 15:30:14 -0400 Message-Id: <20190522193127.27079-19-sashal@kernel.org> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20190522193127.27079-1-sashal@kernel.org> References: <20190522193127.27079-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Tang Junhui [ Upstream commit 631207314d88e9091be02fbdd1fdadb1ae2ed79a ] journal replay failed with messages: Sep 10 19:10:43 ceph kernel: bcache: error on bb379a64-e44e-4812-b91d-a5599871a3b1: bcache: journal entries 2057493-2057567 missing! (replaying 2057493-2076601), disabling caching The reason is in journal_reclaim(), when discard is enabled, we send discard command and reclaim those journal buckets whose seq is old than the last_seq_now, but before we write a journal with last_seq_now, the machine is restarted, so the journal with the last_seq_now is not written to the journal bucket, and the last_seq_wrote in the newest journal is old than last_seq_now which we expect to be, so when we doing replay, journals from last_seq_wrote to last_seq_now are missing. It's hard to write a journal immediately after journal_reclaim(), and it harmless if those missed journal are caused by discarding since those journals are already wrote to btree node. So, if miss seqs are started from the beginning journal, we treat it as normal, and only print a message to show the miss journal, and point out it maybe caused by discarding. Patch v2 add a judgement condition to ignore the missed journal only when discard enabled as Coly suggested. (Coly Li: rebase the patch with other changes in bch_journal_replay()) Signed-off-by: Tang Junhui Tested-by: Dennis Schridde Signed-off-by: Coly Li Signed-off-by: Jens Axboe Signed-off-by: Sasha Levin --- drivers/md/bcache/journal.c | 25 +++++++++++++++++++++---- 1 file changed, 21 insertions(+), 4 deletions(-) diff --git a/drivers/md/bcache/journal.c b/drivers/md/bcache/journal.c index dfedc2c1f1e15..e12907fef597c 100644 --- a/drivers/md/bcache/journal.c +++ b/drivers/md/bcache/journal.c @@ -309,6 +309,18 @@ void bch_journal_mark(struct cache_set *c, struct list_head *list) } } +bool is_discard_enabled(struct cache_set *s) +{ + struct cache *ca; + unsigned int i; + + for_each_cache(ca, s, i) + if (ca->discard) + return true; + + return false; +} + int bch_journal_replay(struct cache_set *s, struct list_head *list) { int ret = 0, keys = 0, entries = 0; @@ -323,10 +335,15 @@ int bch_journal_replay(struct cache_set *s, struct list_head *list) BUG_ON(i->pin && atomic_read(i->pin) != 1); if (n != i->j.seq) { - pr_err("bcache: journal entries %llu-%llu missing! (replaying %llu-%llu)", - n, i->j.seq - 1, start, end); - ret = -EIO; - goto err; + if (n == start && is_discard_enabled(s)) + pr_info("bcache: journal entries %llu-%llu may be discarded! (replaying %llu-%llu)", + n, i->j.seq - 1, start, end); + else { + pr_err("bcache: journal entries %llu-%llu missing! (replaying %llu-%llu)", + n, i->j.seq - 1, start, end); + ret = -EIO; + goto err; + } } for (k = i->j.start; -- 2.20.1