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=-6.8 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS 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 78F00C35250 for ; Sun, 9 Feb 2020 13:01:15 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 4DF3320733 for ; Sun, 9 Feb 2020 13:01:15 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1581253275; bh=/9WUzF0Wea1eOG12KvX2Zj9qfmch1qf7XBE/zFiPFcM=; h=Subject:To:Cc:From:Date:List-ID:From; b=gnbcIONjGxH/QRiXpY1w8ez9JbZ9FEDLUf8+BBsI/Hh5l7rs5OLT88jABf6IUeHKN 6zWUcXbEvO5LekzoWg+D2yjOoxirJSyHgDPRhkeDFNBT1fN+u87WdyIOzEJfXbJ+Tw XURUSRmaV10XS/NV5XEItugmsQEaEjZCpwhgGmS0= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727707AbgBINBP (ORCPT ); Sun, 9 Feb 2020 08:01:15 -0500 Received: from out5-smtp.messagingengine.com ([66.111.4.29]:60613 "EHLO out5-smtp.messagingengine.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727473AbgBINBO (ORCPT ); Sun, 9 Feb 2020 08:01:14 -0500 Received: from compute6.internal (compute6.nyi.internal [10.202.2.46]) by mailout.nyi.internal (Postfix) with ESMTP id C62B821E97; Sun, 9 Feb 2020 08:01:13 -0500 (EST) Received: from mailfrontend2 ([10.202.2.163]) by compute6.internal (MEProxy); Sun, 09 Feb 2020 08:01:13 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d= messagingengine.com; h=cc:content-transfer-encoding:content-type :date:from:message-id:mime-version:subject:to:x-me-proxy :x-me-proxy:x-me-sender:x-me-sender:x-sasl-enc; s=fm2; bh=iPX40N 6j7ojTzJPGEXvo6MbLPWn8a6LGrQKlPgTISkI=; b=REnkx1qyZ95jEU1X4OQmE6 bM3OffAgqrRuUGO1MB8q0FyKqE46T+ieWReluOTTkAArDS5j2lk4n6zZKTX3IJLm 4bpcA6ZstdwTKxj1VjXfu80EA6yTqadqKMp4ZbwaW0r9hXI5tM7joCJtsXhCrq47 zV8591XKzlU/Igidvd8VP5ne96mz3Z9BUAdtFIcZ06R2v8dU/c/l+hL7KtUto7pu pb4cHp1Dvw8rE6IURjK2eoFWVNN7S7WwB+8QrtO94UTzyzmhkQT76Zo1XRT60yIT yqdvgkCn/uI0U2HlpGLXWD+hhgplV9+Luh8VHI8Gs/KsL/8/lpMFTcjSghEWqJcw == X-ME-Sender: X-ME-Proxy-Cause: gggruggvucftvghtrhhoucdtuddrgedugedrheelgddvgecutefuodetggdotefrodftvf curfhrohhfihhlvgemucfhrghsthforghilhdpqfgfvfdpuffrtefokffrpgfnqfghnecu uegrihhlohhuthemuceftddtnecunecujfgurhepuffvhfffkfggtgfgsehtkeertddttd flnecuhfhrohhmpeeoghhrvghgkhhhsehlihhnuhigfhhouhhnuggrthhiohhnrdhorhhg qeenucfkphepfeekrdelkedrfeejrddufeehnecuvehluhhsthgvrhfuihiivgepgeenuc frrghrrghmpehmrghilhhfrhhomhepghhrvghgsehkrhhorghhrdgtohhm X-ME-Proxy: Received: from localhost (unknown [38.98.37.135]) by mail.messagingengine.com (Postfix) with ESMTPA id 677573060272; Sun, 9 Feb 2020 08:01:12 -0500 (EST) Subject: FAILED: patch "[PATCH] btrfs: do not zero f_bavail if we have available space" failed to apply to 4.4-stable tree To: josef@toxicpanda.com, dsterba@suse.com, martin@lichtvoll.de, wqu@suse.com Cc: From: Date: Sun, 09 Feb 2020 12:33:41 +0100 Message-ID: <158124802120462@kroah.com> MIME-Version: 1.0 Content-Type: text/plain; charset=ANSI_X3.4-1968 Content-Transfer-Encoding: 8bit Sender: stable-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org The patch below does not apply to the 4.4-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to . thanks, greg k-h ------------------ original commit in Linus's tree ------------------ >From d55966c4279bfc6a0cf0b32bf13f5df228a1eeb6 Mon Sep 17 00:00:00 2001 From: Josef Bacik Date: Fri, 31 Jan 2020 09:31:05 -0500 Subject: [PATCH] btrfs: do not zero f_bavail if we have available space There was some logic added a while ago to clear out f_bavail in statfs() if we did not have enough free metadata space to satisfy our global reserve. This was incorrect at the time, however didn't really pose a problem for normal file systems because we would often allocate chunks if we got this low on free metadata space, and thus wouldn't really hit this case unless we were actually full. Fast forward to today and now we are much better about not allocating metadata chunks all of the time. Couple this with d792b0f19711 ("btrfs: always reserve our entire size for the global reserve") which now means we'll easily have a larger global reserve than our free space, we are now more likely to trip over this while still having plenty of space. Fix this by skipping this logic if the global rsv's space_info is not full. space_info->full is 0 unless we've attempted to allocate a chunk for that space_info and that has failed. If this happens then the space for the global reserve is definitely sacred and we need to report b_avail == 0, but before then we can just use our calculated b_avail. Reported-by: Martin Steigerwald Fixes: ca8a51b3a979 ("btrfs: statfs: report zero available if metadata are exhausted") CC: stable@vger.kernel.org # 4.5+ Reviewed-by: Qu Wenruo Tested-By: Martin Steigerwald Signed-off-by: Josef Bacik Reviewed-by: David Sterba Signed-off-by: David Sterba diff --git a/fs/btrfs/super.c b/fs/btrfs/super.c index a906315efd19..0616a5434793 100644 --- a/fs/btrfs/super.c +++ b/fs/btrfs/super.c @@ -2135,7 +2135,15 @@ static int btrfs_statfs(struct dentry *dentry, struct kstatfs *buf) */ thresh = SZ_4M; - if (!mixed && total_free_meta - thresh < block_rsv->size) + /* + * We only want to claim there's no available space if we can no longer + * allocate chunks for our metadata profile and our global reserve will + * not fit in the free metadata space. If we aren't ->full then we + * still can allocate chunks and thus are fine using the currently + * calculated f_bavail. + */ + if (!mixed && block_rsv->space_info->full && + total_free_meta - thresh < block_rsv->size) buf->f_bavail = 0; buf->f_type = BTRFS_SUPER_MAGIC;