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=-10.1 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,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 0A226C3B19F for ; Fri, 14 Feb 2020 16:09:35 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id CC27924676 for ; Fri, 14 Feb 2020 16:09:34 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1581696574; bh=OJ3QoIR3qxJpH00wRqFPDjc6ftqQZW1lGIxutzeBQR4=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=L/AwuUYDg0ACqIJ6av5LL2AQOIoxu/XvN0icYynwmqEOAWLKDwGCrznxneoWuCUNH PZWzkce/7gSaR0b6UMre3DWgp4wU4NaJv0DtY4IiF+t66w5ul7AMIPK7gVwTbRHgRr vLgTXnF/4GdXyn/7et6CKTY8+fGHF4Q9vo8ypWMY= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2391305AbgBNQJd (ORCPT ); Fri, 14 Feb 2020 11:09:33 -0500 Received: from mail.kernel.org ([198.145.29.99]:34078 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2391294AbgBNQJc (ORCPT ); Fri, 14 Feb 2020 11:09:32 -0500 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 389AA2467E; Fri, 14 Feb 2020 16:09:31 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1581696572; bh=OJ3QoIR3qxJpH00wRqFPDjc6ftqQZW1lGIxutzeBQR4=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=IUEtYfAjjlyVFA+5au781zBe0ojTh5q235EJ0WQIXkUK/ZQK3Rro525z1sArHlxeO UOIjLzetVBPk8UWOPTDHQYJsG0PRJLzF95DYB54kv5zMmqzvwrEOoO8mAgwIb1JB0d u405GLJyB9MiH3sjHEChqFcTavvdTl+VI9sEQ1bQ= From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Anand Jain , philip@philip-seeger.de, Josef Bacik , David Sterba , Sasha Levin , linux-btrfs@vger.kernel.org Subject: [PATCH AUTOSEL 5.4 361/459] btrfs: device stats, log when stats are zeroed Date: Fri, 14 Feb 2020 11:00:11 -0500 Message-Id: <20200214160149.11681-361-sashal@kernel.org> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20200214160149.11681-1-sashal@kernel.org> References: <20200214160149.11681-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit Sender: stable-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Anand Jain [ Upstream commit a69976bc69308aa475d0ba3b8b3efd1d013c0460 ] We had a report indicating that some read errors aren't reported by the device stats in the userland. It is important to have the errors reported in the device stat as user land scripts might depend on it to take the reasonable corrective actions. But to debug these issue we need to be really sure that request to reset the device stat did not come from the userland itself. So log an info message when device error reset happens. For example: BTRFS info (device sdc): device stats zeroed by btrfs(9223) Reported-by: philip@philip-seeger.de Link: https://www.spinics.net/lists/linux-btrfs/msg96528.html Reviewed-by: Josef Bacik Signed-off-by: Anand Jain Reviewed-by: David Sterba Signed-off-by: David Sterba Signed-off-by: Sasha Levin --- fs/btrfs/volumes.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c index f7d9fc1a6fc2f..9ab3ae5df3005 100644 --- a/fs/btrfs/volumes.c +++ b/fs/btrfs/volumes.c @@ -7561,6 +7561,8 @@ int btrfs_get_dev_stats(struct btrfs_fs_info *fs_info, else btrfs_dev_stat_set(dev, i, 0); } + btrfs_info(fs_info, "device stats zeroed by %s (%d)", + current->comm, task_pid_nr(current)); } else { for (i = 0; i < BTRFS_DEV_STAT_VALUES_MAX; i++) if (stats->nr_items > i) -- 2.20.1