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 Received: from lists.sourceforge.net (lists.sourceforge.net [216.105.38.7]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 7DAE3C4332F for ; Fri, 25 Feb 2022 02:07:22 +0000 (UTC) Received: from [127.0.0.1] (helo=sfs-ml-2.v29.lw.sourceforge.com) by sfs-ml-2.v29.lw.sourceforge.com with esmtp (Exim 4.94.2) (envelope-from ) id 1nNQ0v-0007Nv-TA; Fri, 25 Feb 2022 02:07:20 +0000 Received: from [172.30.20.202] (helo=mx.sourceforge.net) by sfs-ml-2.v29.lw.sourceforge.com with esmtps (TLS1.2) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.94.2) (envelope-from ) id 1nNQ0u-0007Np-4Q for linux-f2fs-devel@lists.sourceforge.net; Fri, 25 Feb 2022 02:07:18 +0000 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=sourceforge.net; s=x; h=Content-Transfer-Encoding:Content-Type:In-Reply-To: From:References:To:Subject:MIME-Version:Date:Message-ID:Sender:Reply-To:Cc: Content-ID:Content-Description:Resent-Date:Resent-From:Resent-Sender: Resent-To:Resent-Cc:Resent-Message-ID:List-Id:List-Help:List-Unsubscribe: List-Subscribe:List-Post:List-Owner:List-Archive; bh=3WmfM2pUlnt7188Ub69UI1QgA0eOvVvpA57LCJfAhKg=; b=J/jtmjjZeJKzX744R1SNaNCnNq vtt/h72OXj/ZruifKIkU+pbLQkrpLxaoX8TUUl5t5ipCrusYvJ8L3kRbGuYLkUNb9cfhhw7afBU9K aJAIySfdx+ViIobgkyCkd0Cwk05/76K08kTjh3Qd7qTCDWZxGmgTk6iLTOZIEJUaRYXM=; DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=sf.net; s=x ; h=Content-Transfer-Encoding:Content-Type:In-Reply-To:From:References:To: Subject:MIME-Version:Date:Message-ID:Sender:Reply-To:Cc:Content-ID: Content-Description:Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc :Resent-Message-ID:List-Id:List-Help:List-Unsubscribe:List-Subscribe: List-Post:List-Owner:List-Archive; bh=3WmfM2pUlnt7188Ub69UI1QgA0eOvVvpA57LCJfAhKg=; b=iaEB7kvouikZYz9OCX0SJjwjAq Twkp1PG5OCI79O4vgGI6O+dpVe/J6mC/e0f4mo3eIft+NPQUsA3DT5EevDI1ocnz9K1rw0HdIutdW jXeANqbXjkBfOjg9JDxf1FRpH6lwq6rxhjYlYmNUAqT3x5GUTHKQJgKp4EL1Vn+71nXM=; Received: from dfw.source.kernel.org ([139.178.84.217]) by sfi-mx-2.v28.lw.sourceforge.com with esmtps (TLS1.2:ECDHE-RSA-AES256-GCM-SHA384:256) (Exim 4.94.2) id 1nNQ0q-0000wW-Rx for linux-f2fs-devel@lists.sourceforge.net; Fri, 25 Feb 2022 02:07:18 +0000 Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id 4640D614E1 for ; Fri, 25 Feb 2022 02:07:10 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id D1558C340E9; Fri, 25 Feb 2022 02:07:08 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1645754829; bh=/rNQ7PbKEORHE5W8GJIvYASYkIGdvtgnf4kTnIWSLT8=; h=Date:Subject:To:References:From:In-Reply-To:From; b=St8PhKgwZ/GyOhZlZ3X5+XNwAIEq6ci5VE5YkA6vSDe36hxMbhS9vERuLk5tTqJ/C i7J+1mvJedSea1EFwpe2hQ0sAn6VVmFi7rGfr3APAcPmdi0juTVOx7wGxIKCTacZQW T83t3zQUqsI6rB7eei+1rdZu6IGLMKOYwdjTJirggVxDan1X8eWHA4ZJ9N2hKmSKnr A4P0QWomTjsXZRKxu6ANRhFqt1PmqMFGUJma33okFcOSmhsgl1u78+1B2afPuFwJ6o TmEa2w7PPsFqzaN2EfJncc90YXBfKRp7p5jmYL3aO4UhLvOc7fpVovx/XkmIy2AQnr 8HMbWsInYoOQA== Message-ID: <119d1f9e-7f2f-019f-6fdd-2bdb59d97bc6@kernel.org> Date: Fri, 25 Feb 2022 10:07:05 +0800 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:91.0) Gecko/20100101 Thunderbird/91.6.0 Content-Language: en-US To: Jaegeuk Kim , linux-kernel@vger.kernel.org, linux-f2fs-devel@lists.sourceforge.net References: <20220212142023.2508247-1-jaegeuk@kernel.org> <20220212142023.2508247-2-jaegeuk@kernel.org> From: Chao Yu In-Reply-To: X-Headers-End: 1nNQ0q-0000wW-Rx Subject: Re: [f2fs-dev] [PATCH 2/2 v2] f2fs: avoid an infinite loop in f2fs_sync_dirty_inodes X-BeenThere: linux-f2fs-devel@lists.sourceforge.net X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Transfer-Encoding: 7bit Content-Type: text/plain; charset="us-ascii"; Format="flowed" Errors-To: linux-f2fs-devel-bounces@lists.sourceforge.net On 2022/2/15 7:27, Jaegeuk Kim wrote: > If one read IO is always failing, we can fall into an infinite loop in > f2fs_sync_dirty_inodes. This happens during xfstests/generic/475. > > [ 142.803335] Buffer I/O error on dev dm-1, logical block 8388592, async page read > ... > [ 382.887210] submit_bio_noacct+0xdd/0x2a0 > [ 382.887213] submit_bio+0x80/0x110 > [ 382.887223] __submit_bio+0x4d/0x300 [f2fs] > [ 382.887282] f2fs_submit_page_bio+0x125/0x200 [f2fs] > [ 382.887299] __get_meta_page+0xc9/0x280 [f2fs] > [ 382.887315] f2fs_get_meta_page+0x13/0x20 [f2fs] > [ 382.887331] f2fs_get_node_info+0x317/0x3c0 [f2fs] > [ 382.887350] f2fs_do_write_data_page+0x327/0x6f0 [f2fs] > [ 382.887367] f2fs_write_single_data_page+0x5b7/0x960 [f2fs] > [ 382.887386] f2fs_write_cache_pages+0x302/0x890 [f2fs] > [ 382.887405] ? preempt_count_add+0x7a/0xc0 > [ 382.887408] f2fs_write_data_pages+0xfd/0x320 [f2fs] > [ 382.887425] ? _raw_spin_unlock+0x1a/0x30 > [ 382.887428] do_writepages+0xd3/0x1d0 > [ 382.887432] filemap_fdatawrite_wbc+0x69/0x90 > [ 382.887434] filemap_fdatawrite+0x50/0x70 > [ 382.887437] f2fs_sync_dirty_inodes+0xa4/0x270 [f2fs] > [ 382.887453] f2fs_write_checkpoint+0x189/0x1640 [f2fs] > [ 382.887469] ? schedule_timeout+0x114/0x150 > [ 382.887471] ? ttwu_do_activate+0x6d/0xb0 > [ 382.887473] ? preempt_count_add+0x7a/0xc0 > [ 382.887476] kill_f2fs_super+0xca/0x100 [f2fs] > [ 382.887491] deactivate_locked_super+0x35/0xa0 > [ 382.887494] deactivate_super+0x40/0x50 > [ 382.887497] cleanup_mnt+0x139/0x190 > [ 382.887499] __cleanup_mnt+0x12/0x20 > [ 382.887501] task_work_run+0x64/0xa0 > [ 382.887505] exit_to_user_mode_prepare+0x1b7/0x1c0 > [ 382.887508] syscall_exit_to_user_mode+0x27/0x50 > [ 382.887510] do_syscall_64+0x48/0xc0 > [ 382.887513] entry_SYSCALL_64_after_hwframe+0x44/0xae > > Signed-off-by: Jaegeuk Kim > --- > Change log from v1: > - fix a regression to report EIO too early > > fs/f2fs/checkpoint.c | 13 ++++++++----- > fs/f2fs/f2fs.h | 3 +++ > 2 files changed, 11 insertions(+), 5 deletions(-) > > diff --git a/fs/f2fs/checkpoint.c b/fs/f2fs/checkpoint.c > index 203a1577942d..56c81c68ef71 100644 > --- a/fs/f2fs/checkpoint.c > +++ b/fs/f2fs/checkpoint.c > @@ -1059,13 +1059,13 @@ int f2fs_sync_dirty_inodes(struct f2fs_sb_info *sbi, enum inode_type type) > struct inode *inode; > struct f2fs_inode_info *fi; > bool is_dir = (type == DIR_INODE); > - unsigned long ino = 0; > + unsigned long ino = 0, retry_count = DEFAULT_RETRY_SYNC_DIR_COUNT; > > trace_f2fs_sync_dirty_inodes_enter(sbi->sb, is_dir, > get_pages(sbi, is_dir ? > F2FS_DIRTY_DENTS : F2FS_DIRTY_DATA)); > retry: > - if (unlikely(f2fs_cp_error(sbi))) { > + if (unlikely(f2fs_cp_error(sbi) || (is_dir && !retry_count))) { > trace_f2fs_sync_dirty_inodes_exit(sbi->sb, is_dir, > get_pages(sbi, is_dir ? > F2FS_DIRTY_DENTS : F2FS_DIRTY_DATA)); > @@ -1096,10 +1096,13 @@ int f2fs_sync_dirty_inodes(struct f2fs_sb_info *sbi, enum inode_type type) > > iput(inode); > /* We need to give cpu to another writers. */ > - if (ino == cur_ino) > - cond_resched(); > - else > + if (ino == cur_ino) { > + retry_count--; > + io_schedule_timeout(DEFAULT_IO_TIMEOUT); > + } else { > + retry_count = DEFAULT_RETRY_SYNC_DIR_COUNT; > ino = cur_ino; > + } > } else { > /* > * We should submit bio, since it exists several > diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h > index c9515c3c54fd..f40ef7b61965 100644 > --- a/fs/f2fs/f2fs.h > +++ b/fs/f2fs/f2fs.h > @@ -577,6 +577,9 @@ enum { > /* maximum retry quota flush count */ > #define DEFAULT_RETRY_QUOTA_FLUSH_COUNT 8 > > +/* maximum retry sync dirty inodes */ > +#define DEFAULT_RETRY_SYNC_DIR_COUNT 3000 3000 * 20ms/round = 60sec How about just trying 5 or 10 sec? Thanks, > + > #define F2FS_LINK_MAX 0xffffffff /* maximum link count per file */ > > #define MAX_DIR_RA_PAGES 4 /* maximum ra pages of dir */ _______________________________________________ Linux-f2fs-devel mailing list Linux-f2fs-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/linux-f2fs-devel