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 C2D88C38142 for ; Sat, 28 Jan 2023 02:08:10 +0000 (UTC) Received: from [127.0.0.1] (helo=sfs-ml-1.v29.lw.sourceforge.com) by sfs-ml-1.v29.lw.sourceforge.com with esmtp (Exim 4.95) (envelope-from ) id 1pLadU-0001Gw-JB; Sat, 28 Jan 2023 02:08:07 +0000 Received: from [172.30.20.202] (helo=mx.sourceforge.net) by sfs-ml-1.v29.lw.sourceforge.com with esmtps (TLS1.2) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.95) (envelope-from ) id 1pLadT-0001Gp-Dq for linux-f2fs-devel@lists.sourceforge.net; Sat, 28 Jan 2023 02:08:06 +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:Cc:To:Subject:MIME-Version:Date:Message-ID:Sender:Reply-To: 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=BjQ81q0Vfxs/duMR44D4SUrNx4kicPiikGiJeV38SlU=; b=Z3jcfN+DoG1aLlljjt+TmtUueo rJ/4grM7xZzLyCPE8fySA9Ps1C+pdEDXCaB8Ka3xXCdKd2PG2lWNdddDJawUtY5DT6Lh/23jneb+0 34nwB7wBXPxqGKrRAIFv+UWAwBDfwXEzLaQb5xcxJCh7qNXvsZSwgrKnT6tfpVPc7jKA=; 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:Cc:To: Subject:MIME-Version:Date:Message-ID:Sender:Reply-To: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=BjQ81q0Vfxs/duMR44D4SUrNx4kicPiikGiJeV38SlU=; b=DOg6Ehi3LetwTN1n1U1MefJ1hm 0Nz0Rh9lc9Hef6KA0au5kF1L0WNsHoacUNaNMTp8X/bnh6bJuG2XDVx9c+NGAlRcWIFfXOOJBiybv ucQ+DO9wlmh7Raj4u7pEk7hNBDqBlmHtmVDaBHeeZq/l2IBm3VvhbKGHgd6Eyxb8P41c=; 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 4.95) id 1pLadQ-0000jT-Cg for linux-f2fs-devel@lists.sourceforge.net; Sat, 28 Jan 2023 02:08:06 +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 C0E4561DD3; Sat, 28 Jan 2023 02:07:55 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 724E0C433EF; Sat, 28 Jan 2023 02:07:52 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1674871675; bh=xgzCRzmI0lEryWo5hfa+X56jGl8dwqUVxbtlBrWeTJ0=; h=Date:Subject:To:Cc:References:From:In-Reply-To:From; b=QLjkhLTOehTSsfYs+XlzYgoTWNywLpaOOD/rrOee6Nda8wCsRGMWtXoJyo+0EYY9g BpVDLLW3Pp1RzKD3Z33u3jmUEJwtJWhauUchgGYdUZ9qz5ICnx/QZGs6A+zWo6Ieob DBWRclqJsqT9a36iy8oE3ggScDqx27MCGWZnKrNTbY0aXh4FK/nOrDXYfH2oBskJ3K BK55KV2x0BJ7HdOxBR+6r6FtTTBP0lvcTnkJCtMbFuOOHV1qVKxW8vsr4WUluXGok3 GRX4zKim8qK63V3pHwxLDo3f6ZNhls5g7yUnkdddcGROhUY3mrzNtRhc3oGDYo7kkN /15Rm9/SraZWQ== Message-ID: Date: Sat, 28 Jan 2023 10:07:48 +0800 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:102.0) Gecko/20100101 Thunderbird/102.6.1 To: Daeho Jeong , linux-kernel@vger.kernel.org, linux-f2fs-devel@lists.sourceforge.net, kernel-team@android.com References: <20230113004933.2082072-1-daeho43@gmail.com> Content-Language: en-US From: Chao Yu In-Reply-To: <20230113004933.2082072-1-daeho43@gmail.com> X-Headers-End: 1pLadQ-0000jT-Cg Subject: Re: [f2fs-dev] [PATCH] f2fs: synchronize atomic write aborts 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: , Cc: Daeho Jeong , syzbot+823000d23b3400619f7c@syzkaller.appspotmail.com Content-Transfer-Encoding: 7bit Content-Type: text/plain; charset="us-ascii"; Format="flowed" Errors-To: linux-f2fs-devel-bounces@lists.sourceforge.net Hi Daeho, Jaegeuk, Please take a look at patchset in below link: https://lore.kernel.org/linux-f2fs-devel/20230109034453.490176-1-chao@kernel.org/T/#t In PATCH 4/5, I'm trying to fix the same issue w/ alternative way, let me know your preference. :) One comment as below. On 2023/1/13 8:49, Daeho Jeong wrote: > From: Daeho Jeong > > To fix a race condition between atomic write aborts, I use the inode > lock and make COW inode to be re-usable thoroughout the whole > atomic file inode lifetime. > > Reported-by: syzbot+823000d23b3400619f7c@syzkaller.appspotmail.com > Fixes: 3db1de0e582c ("f2fs: change the current atomic write way") > Signed-off-by: Daeho Jeong > --- > fs/f2fs/file.c | 43 ++++++++++++++++++++++++++++--------------- > fs/f2fs/inode.c | 11 +++++++++-- > fs/f2fs/segment.c | 3 --- > fs/f2fs/super.c | 2 -- > 4 files changed, 37 insertions(+), 22 deletions(-) > > diff --git a/fs/f2fs/file.c b/fs/f2fs/file.c > index ecbc8c135b49..ff072a9ed258 100644 > --- a/fs/f2fs/file.c > +++ b/fs/f2fs/file.c > @@ -1866,7 +1866,10 @@ static int f2fs_release_file(struct inode *inode, struct file *filp) > atomic_read(&inode->i_writecount) != 1) > return 0; > > + inode_lock(inode); > f2fs_abort_atomic_write(inode, true); > + inode_unlock(inode); > + > return 0; > } > > @@ -1880,8 +1883,11 @@ static int f2fs_file_flush(struct file *file, fl_owner_t id) > * until all the writers close its file. Since this should be done > * before dropping file lock, it needs to do in ->flush. > */ > - if (F2FS_I(inode)->atomic_write_task == current) > + if (F2FS_I(inode)->atomic_write_task == current) { > + inode_lock(inode); > f2fs_abort_atomic_write(inode, true); > + inode_unlock(inode); > + } > return 0; > } > > @@ -2087,19 +2093,28 @@ static int f2fs_ioc_start_atomic_write(struct file *filp, bool truncate) > goto out; > } > > - /* Create a COW inode for atomic write */ > - pinode = f2fs_iget(inode->i_sb, fi->i_pino); > - if (IS_ERR(pinode)) { > - f2fs_up_write(&fi->i_gc_rwsem[WRITE]); > - ret = PTR_ERR(pinode); > - goto out; > - } > + /* Check if the inode already has a COW inode */ > + if (fi->cow_inode == NULL) { > + /* Create a COW inode for atomic write */ > + pinode = f2fs_iget(inode->i_sb, fi->i_pino); > + if (IS_ERR(pinode)) { > + f2fs_up_write(&fi->i_gc_rwsem[WRITE]); > + ret = PTR_ERR(pinode); > + goto out; > + } > > - ret = f2fs_get_tmpfile(mnt_userns, pinode, &fi->cow_inode); > - iput(pinode); > - if (ret) { > - f2fs_up_write(&fi->i_gc_rwsem[WRITE]); > - goto out; > + ret = f2fs_get_tmpfile(mnt_userns, pinode, &fi->cow_inode); > + iput(pinode); > + if (ret) { > + f2fs_up_write(&fi->i_gc_rwsem[WRITE]); > + goto out; > + } > + > + set_inode_flag(fi->cow_inode, FI_COW_FILE); > + clear_inode_flag(fi->cow_inode, FI_INLINE_DATA); > + } else { > + /* Reuse the already created COW inode */ > + f2fs_do_truncate_blocks(fi->cow_inode, 0, true); > } > > f2fs_write_inode(inode, NULL); > @@ -2107,8 +2122,6 @@ static int f2fs_ioc_start_atomic_write(struct file *filp, bool truncate) > stat_inc_atomic_inode(inode); > > set_inode_flag(inode, FI_ATOMIC_FILE); > - set_inode_flag(fi->cow_inode, FI_COW_FILE); > - clear_inode_flag(fi->cow_inode, FI_INLINE_DATA); > > isize = i_size_read(inode); > fi->original_i_size = isize; > diff --git a/fs/f2fs/inode.c b/fs/f2fs/inode.c > index ff6cf66ed46b..4921f7209e28 100644 > --- a/fs/f2fs/inode.c > +++ b/fs/f2fs/inode.c > @@ -766,11 +766,18 @@ int f2fs_write_inode(struct inode *inode, struct writeback_control *wbc) > void f2fs_evict_inode(struct inode *inode) > { > struct f2fs_sb_info *sbi = F2FS_I_SB(inode); > - nid_t xnid = F2FS_I(inode)->i_xattr_nid; > + struct f2fs_inode_info *fi = F2FS_I(inode); > + nid_t xnid = fi->i_xattr_nid; > int err = 0; > > f2fs_abort_atomic_write(inode, true); > > + if (fi->cow_inode) { > + clear_inode_flag(fi->cow_inode, FI_COW_FILE); > + iput(fi->cow_inode); > + fi->cow_inode = NULL; > + } > + > trace_f2fs_evict_inode(inode); > truncate_inode_pages_final(&inode->i_data); > > @@ -857,7 +864,7 @@ void f2fs_evict_inode(struct inode *inode) > stat_dec_inline_inode(inode); > stat_dec_compr_inode(inode); > stat_sub_compr_blocks(inode, > - atomic_read(&F2FS_I(inode)->i_compr_blocks)); > + atomic_read(&fi->i_compr_blocks)); > > if (likely(!f2fs_cp_error(sbi) && > !is_sbi_flag_set(sbi, SBI_CP_DISABLED))) > diff --git a/fs/f2fs/segment.c b/fs/f2fs/segment.c > index ae3c4e5474ef..536d7c674b04 100644 > --- a/fs/f2fs/segment.c > +++ b/fs/f2fs/segment.c > @@ -192,9 +192,6 @@ void f2fs_abort_atomic_write(struct inode *inode, bool clean) > if (!f2fs_is_atomic_file(inode)) > return; > > - clear_inode_flag(fi->cow_inode, FI_COW_FILE); > - iput(fi->cow_inode); > - fi->cow_inode = NULL; > release_atomic_write_cnt(inode); > clear_inode_flag(inode, FI_ATOMIC_COMMITTED); > clear_inode_flag(inode, FI_ATOMIC_REPLACE); > diff --git a/fs/f2fs/super.c b/fs/f2fs/super.c > index 1f812b9ce985..10463f084d30 100644 > --- a/fs/f2fs/super.c > +++ b/fs/f2fs/super.c > @@ -1430,8 +1430,6 @@ static int f2fs_drop_inode(struct inode *inode) > atomic_inc(&inode->i_count); > spin_unlock(&inode->i_lock); > > - f2fs_abort_atomic_write(inode, true); In order to avoid caching obsolete page of cow_inode, how about truncating them here? if (f2fs_is_atomic_file() && cow_inode) truncate_inode_pages_final(&cow_inode->i_data); Thanks, > - > /* should remain fi->extent_tree for writepage */ > f2fs_destroy_extent_node(inode); > _______________________________________________ Linux-f2fs-devel mailing list Linux-f2fs-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/linux-f2fs-devel