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=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_PASS, T_DKIMWL_WL_HIGH,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 347EAC004C9 for ; Tue, 7 May 2019 05:55:46 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 02AC22054F for ; Tue, 7 May 2019 05:55:46 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1557208546; bh=mColmzft8Nb+sAebGjP60wsb9mHLEDd39ULoikCLQWE=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=Rcf1RpbE4w336P/tbSjjeA3Q78yCxJ1rlrXRcyoObhvnEf+txF0ub5diAwif8uunW aeFeJ5WcWmrs+4fjn+WXUD/3M2NM4ykshT2kyT0FcFRkincC7I+YXzhHMTIgaXvh9z ob6eL8/JvF//DMeXG5uijCN4UOtAa+UR93hXZ8Pw= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728090AbfEGFiL (ORCPT ); Tue, 7 May 2019 01:38:11 -0400 Received: from mail.kernel.org ([198.145.29.99]:57898 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728499AbfEGFiG (ORCPT ); Tue, 7 May 2019 01:38:06 -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 85E9D214AE; Tue, 7 May 2019 05:38:04 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1557207485; bh=mColmzft8Nb+sAebGjP60wsb9mHLEDd39ULoikCLQWE=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=xuSuZiGkT8DszPhGCJZ4NccO+70AoR17ByxGnoaA5Mzi5Acq1+Y+O7tbyEldVFqBY tLESniwSAG+mu86tS+edp0aR/adk3NeXlPZAwrUzImS4wqeWNjTLCIq2pa/auBMdmh /gnxexnphg8D+EgMNu9P2eRgBA2EOk6WB2h+4GiA= From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: zhengliang , Chao Yu , Jaegeuk Kim , Sasha Levin , linux-f2fs-devel@lists.sourceforge.net Subject: [PATCH AUTOSEL 4.19 69/81] f2fs: fix to data block override node segment by mistake Date: Tue, 7 May 2019 01:35:40 -0400 Message-Id: <20190507053554.30848-69-sashal@kernel.org> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20190507053554.30848-1-sashal@kernel.org> References: <20190507053554.30848-1-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: zhengliang [ Upstream commit a0770e13c8da83bdb64738c0209ab02dd3cfff8b ] v4: Rearrange the previous three versions. The following scenario could lead to data block override by mistake. TASK A | TASK kworker | TASK B | TASK C | | | open | | | write | | | close | | | | f2fs_write_data_pages | | | f2fs_write_cache_pages | | | f2fs_outplace_write_data | | | f2fs_allocate_data_block (get block in seg S, | | | S is full, and only | | | have this valid data | | | block) | | | allocate_segment | | | locate_dirty_segment (mark S as PRE) | | | f2fs_submit_page_write (submit but is not | | | written on dev) | | unlink | | | iput_final | | | f2fs_drop_inode | | | f2fs_truncate | | | (not evict) | | | | | write_checkpoint | | | flush merged bio but not wait file data writeback | | | set_prefree_as_free (mark S as FREE) | | | | update NODE/DATA | | | allocate_segment (select S) | writeback done | | So we need to guarantee io complete before truncate inode in f2fs_drop_inode. Reviewed-by: Chao Yu Signed-off-by: Zheng Liang Signed-off-by: Jaegeuk Kim Signed-off-by: Sasha Levin --- fs/f2fs/super.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/fs/f2fs/super.c b/fs/f2fs/super.c index 2264f27fd26d..036eb1e0d557 100644 --- a/fs/f2fs/super.c +++ b/fs/f2fs/super.c @@ -890,6 +890,10 @@ static int f2fs_drop_inode(struct inode *inode) sb_start_intwrite(inode->i_sb); f2fs_i_size_write(inode, 0); + f2fs_submit_merged_write_cond(F2FS_I_SB(inode), + inode, NULL, 0, DATA); + truncate_inode_pages_final(inode->i_mapping); + if (F2FS_HAS_BLOCKS(inode)) f2fs_truncate(inode); -- 2.20.1