From patchwork Tue Aug 18 10:38:23 2015 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Michal Hocko X-Patchwork-Id: 7030351 Return-Path: X-Original-To: patchwork-linux-btrfs@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork2.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.136]) by patchwork2.web.kernel.org (Postfix) with ESMTP id 7D36FC05AC for ; Tue, 18 Aug 2015 10:38:47 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 91F5C20650 for ; Tue, 18 Aug 2015 10:38:46 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 950A420379 for ; Tue, 18 Aug 2015 10:38:45 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752665AbbHRKi3 (ORCPT ); Tue, 18 Aug 2015 06:38:29 -0400 Received: from mail-wi0-f169.google.com ([209.85.212.169]:36090 "EHLO mail-wi0-f169.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752309AbbHRKi0 (ORCPT ); Tue, 18 Aug 2015 06:38:26 -0400 Received: by wicja10 with SMTP id ja10so91210485wic.1; Tue, 18 Aug 2015 03:38:24 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=date:from:to:cc:subject:message-id:references:mime-version :content-type:content-disposition:in-reply-to:user-agent; bh=2ZuWl32vYM8o0X36yPVxTSU46RTDSDeqZGsr4EflA7s=; b=GjS0yFCEV+7mf5ZblDQY0+VjfUtXhH3pIcf2TxwXM3Dvpnmyq/o1rZI3qApTZzXO1E 7IGk4SFDEjLpkELXUF5FR7fO2KiVVUJtZjlBQ0H1N6m+/m8yos6SJjcHRup0AVMxVluz wJeNH3k0GWzneQ8owgggCOHFRQVhyFhr6wongWO0+Nvgm2SvKQ1pk5nn1MK2f0pNDCR6 XRBi6GAqwR25o4jLM17lYqqP0rLpb8w97+cf2V42+O0yTJah7A7rpY1RuwZS3vuMUsb9 14/81AWuRcFiXrPR5OuXEVBoRAJIBxe1LbFUr9ooXIhZsmS65G1zk7Dj653/S76HFYuo iD+w== X-Received: by 10.194.93.198 with SMTP id cw6mr12234673wjb.113.1439894304889; Tue, 18 Aug 2015 03:38:24 -0700 (PDT) Received: from localhost (bband-dyn181.95-103-48.t-com.sk. [95.103.48.181]) by smtp.gmail.com with ESMTPSA id fs8sm20791107wib.0.2015.08.18.03.38.24 (version=TLSv1.2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Tue, 18 Aug 2015 03:38:24 -0700 (PDT) Date: Tue, 18 Aug 2015 12:38:23 +0200 From: Michal Hocko To: LKML Cc: linux-mm@kvack.org, linux-fsdevel@vger.kernel.org, Andrew Morton , Johannes Weiner , Tetsuo Handa , Dave Chinner , Theodore Ts'o , linux-btrfs@vger.kernel.org, linux-ext4@vger.kernel.org, Jan Kara Subject: [RFC -v2 4/8] jbd, jbd2: Do not fail journal because of frozen_buffer allocation failure Message-ID: <20150818103823.GC5033@dhcp22.suse.cz> References: <1438768284-30927-1-git-send-email-mhocko@kernel.org> <1438768284-30927-5-git-send-email-mhocko@kernel.org> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <1438768284-30927-5-git-send-email-mhocko@kernel.org> User-Agent: Mutt/1.5.23 (2014-03-12) Sender: linux-btrfs-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-btrfs@vger.kernel.org X-Spam-Status: No, score=-7.3 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_HI, RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP From: Michal Hocko Journal transaction might fail prematurely because the frozen_buffer is allocated by GFP_NOFS request: [ 72.440013] do_get_write_access: OOM for frozen_buffer [ 72.440014] EXT4-fs: ext4_reserve_inode_write:4729: aborting transaction: Out of memory in __ext4_journal_get_write_access [ 72.440015] EXT4-fs error (device sda1) in ext4_reserve_inode_write:4735: Out of memory (...snipped....) [ 72.495559] do_get_write_access: OOM for frozen_buffer [ 72.495560] EXT4-fs: ext4_reserve_inode_write:4729: aborting transaction: Out of memory in __ext4_journal_get_write_access [ 72.496839] do_get_write_access: OOM for frozen_buffer [ 72.496841] EXT4-fs: ext4_reserve_inode_write:4729: aborting transaction: Out of memory in __ext4_journal_get_write_access [ 72.505766] Aborting journal on device sda1-8. [ 72.505851] EXT4-fs (sda1): Remounting filesystem read-only This wasn't a problem until "mm: page_alloc: do not lock up GFP_NOFS allocations upon OOM" because small GPF_NOFS allocations never failed. This allocation seems essential for the journal and GFP_NOFS is too restrictive to the memory allocator so let's use __GFP_NOFAIL here to emulate the previous behavior. jbd code has the very same issue so let's do the same there as well. Signed-off-by: Michal Hocko --- fs/jbd/transaction.c | 11 +---------- fs/jbd2/transaction.c | 23 ++++------------------- 2 files changed, 5 insertions(+), 29 deletions(-) diff --git a/fs/jbd/transaction.c b/fs/jbd/transaction.c index 1695ba8334a2..bf7474deda2f 100644 --- a/fs/jbd/transaction.c +++ b/fs/jbd/transaction.c @@ -673,16 +673,7 @@ do_get_write_access(handle_t *handle, struct journal_head *jh, jbd_unlock_bh_state(bh); frozen_buffer = jbd_alloc(jh2bh(jh)->b_size, - GFP_NOFS); - if (!frozen_buffer) { - printk(KERN_ERR - "%s: OOM for frozen_buffer\n", - __func__); - JBUFFER_TRACE(jh, "oom!"); - error = -ENOMEM; - jbd_lock_bh_state(bh); - goto done; - } + GFP_NOFS|__GFP_NOFAIL); goto repeat; } jh->b_frozen_data = frozen_buffer; diff --git a/fs/jbd2/transaction.c b/fs/jbd2/transaction.c index ff2f2e6ad311..4d63c5911afa 100644 --- a/fs/jbd2/transaction.c +++ b/fs/jbd2/transaction.c @@ -923,16 +923,7 @@ do_get_write_access(handle_t *handle, struct journal_head *jh, jbd_unlock_bh_state(bh); frozen_buffer = jbd2_alloc(jh2bh(jh)->b_size, - GFP_NOFS); - if (!frozen_buffer) { - printk(KERN_ERR - "%s: OOM for frozen_buffer\n", - __func__); - JBUFFER_TRACE(jh, "oom!"); - error = -ENOMEM; - jbd_lock_bh_state(bh); - goto done; - } + GFP_NOFS|__GFP_NOFAIL); goto repeat; } jh->b_frozen_data = frozen_buffer; @@ -1156,15 +1147,9 @@ int jbd2_journal_get_undo_access(handle_t *handle, struct buffer_head *bh) goto out; repeat: - if (!jh->b_committed_data) { - committed_data = jbd2_alloc(jh2bh(jh)->b_size, GFP_NOFS); - if (!committed_data) { - printk(KERN_ERR "%s: No memory for committed data\n", - __func__); - err = -ENOMEM; - goto out; - } - } + if (!jh->b_committed_data) + committed_data = jbd2_alloc(jh2bh(jh)->b_size, + GFP_NOFS|__GFP_NOFAIL); jbd_lock_bh_state(bh); if (!jh->b_committed_data) {