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 89E42CA1016 for ; Thu, 11 Sep 2025 07:43:12 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.sourceforge.net; s=beta; h=Content-Transfer-Encoding:Content-Type:Cc: List-Subscribe:List-Help:List-Post:List-Archive:List-Unsubscribe:List-Id: Subject:MIME-Version:References:In-Reply-To:Message-ID:Date:To:From:Sender: Reply-To:Content-ID:Content-Description:Resent-Date:Resent-From:Resent-Sender :Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=HnmzxJuGqtsQhj2o62JMGCEYzFUjqqhBrkPaH4UUCIg=; b=HkpfBnFAe2nuL4itxizFIXdH66 Ars/ueBc3XGwCYbRbs0LLRtn4s/eCEX/nMqZnb32ghMEeldDszcojgy7kZFoF3SUdTl4Mjdn44o6q mJrxzoQlx2y1n1AUlD7cGHEUVwMZThlvBV6VQAlpFmQiZzdUc5SVHxM0zqYrVbqLXRJQ=; 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 1uwbxX-0000Ej-7o; Thu, 11 Sep 2025 07:43:11 +0000 Received: from [172.30.29.66] (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 1uwbxV-0000Ed-Qa for linux-f2fs-devel@lists.sourceforge.net; Thu, 11 Sep 2025 07:43:09 +0000 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=sourceforge.net; s=x; h=Content-Type:Content-Transfer-Encoding:MIME-Version :References:In-Reply-To:Message-ID:Date:Subject:CC:To:From: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=/nIAUlfMJKzaQDwsPUuGN9VRDGJYAdNEzEXEqdePAQ8=; b=kF1nVs+bim8mwZUtkOs/h5KPjQ lfKFj5anP7ALd/4RErM6TZdgQixucVowae95l1+Z4SeJePNNstiwdns2UgMApkfZph/8NW1ztz/lF hkKrfJnfDQnX1qChYm78FdueYFFaJyOMICcnfPand1COgamayNS07GgqotsK40QqhstI=; DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=sf.net; s=x ; h=Content-Type:Content-Transfer-Encoding:MIME-Version:References: In-Reply-To:Message-ID:Date:Subject:CC:To:From: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=/nIAUlfMJKzaQDwsPUuGN9VRDGJYAdNEzEXEqdePAQ8=; b=egLGM/7h/9UeiNrLM+FGE1lFiK FCmsBwotPObKShOeW5tfRlITBYIKDk1+IP1E1jffuVUZcaXEITLaoe5rWDmM+7W5jf0KX6wZ2Kq56 FG1UYwJd0KGzrlx7qlyGbC7du38TQ7om+eyu8ltH1O5vseHHr09Q9Ut+KNLbpRvJujLA=; Received: from mta22.hihonor.com ([81.70.192.198]) by sfi-mx-2.v28.lw.sourceforge.com with esmtps (TLS1.2:ECDHE-RSA-AES256-GCM-SHA384:256) (Exim 4.95) id 1uwbxU-0007JF-Ol for linux-f2fs-devel@lists.sourceforge.net; Thu, 11 Sep 2025 07:43:09 +0000 dkim-signature: v=1; a=rsa-sha256; d=honor.com; s=dkim; c=relaxed/relaxed; q=dns/txt; h=To:From; bh=/nIAUlfMJKzaQDwsPUuGN9VRDGJYAdNEzEXEqdePAQ8=; b=LhkM5LUHiIHF8FvVTi1e5YaHlF2Jt3kBoPMPvdsNK9IFb2PsOvNaUpLYMQ/uDUL4GuOP/S+5t TSNMFe7p0pHkQA88K7mCGGju1J0FeZXk9RXykMOj48W6ubTCqZEDhEpzSUn1z7LhDK7yjZReU9D wRU3Dg6DDOZmDldLHSfh+og= Received: from w002.hihonor.com (unknown [10.68.28.120]) by mta22.hihonor.com (SkyGuard) with ESMTPS id 4cMqJt0Yl1zYl4ZW; Thu, 11 Sep 2025 15:42:22 +0800 (CST) Received: from a011.hihonor.com (10.68.31.243) by w002.hihonor.com (10.68.28.120) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.1544.11; Thu, 11 Sep 2025 15:42:39 +0800 Received: from localhost.localdomain (10.144.23.14) by a011.hihonor.com (10.68.31.243) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.1544.11; Thu, 11 Sep 2025 15:42:39 +0800 From: wangzijie To: Date: Thu, 11 Sep 2025 15:42:39 +0800 Message-ID: <20250911074239.2933899-1-wangzijie1@honor.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: References: MIME-Version: 1.0 X-Originating-IP: [10.144.23.14] X-ClientProxiedBy: w001.hihonor.com (10.68.25.235) To a011.hihonor.com (10.68.31.243) X-Headers-End: 1uwbxU-0007JF-Ol Subject: Re: [f2fs-dev] [PATCH 1/2] f2fs: fix wrong extent_info data for precache extents 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: jaegeuk@kernel.org, wangzijie1@honor.com, linux-kernel@vger.kernel.org, feng.han@honor.com Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: linux-f2fs-devel-bounces@lists.sourceforge.net > On 9/10/25 21:58, wangzijie wrote: > > When the data layout is like this: > > dnode1: dnode2: > > [0] A [0] NEW_ADDR > > [1] A+1 [1] 0x0 > > ... .... > > [1016] A+1016 > > [1017] B (B!=A+1017) [1017] 0x0 > > > > We can build this kind of layout by following steps(with i_extra_isize:36): > > ./f2fs_io write 1 0 1881 rand dsync testfile > > ./f2fs_io write 1 1881 1 rand buffered testfile > > ./f2fs_io fallocate 0 7708672 4096 testfile > > > > And when we map first data block in dnode2, we will get wrong extent_info data: > > map->m_len = 1 > > ofs = start_pgofs - map->m_lblk = 1882 - 1881 = 1 > > > > ei.fofs = start_pgofs = 1882 > > ei.len = map->m_len - ofs = 1 - 1 = 0 > > Hi Zijie, > > I tried to reproduce w/ below steps: > > f2fs_io write 1 0 1881 rand dsync testfile > f2fs_io write 1 1881 1 rand buffered testfile > f2fs_io fallocate 0 7708672 4096 testfile > umount > mount > f2fs_io precache_extents testfile > > f2fs_io-921 [013] ..... 1049.855817: f2fs_lookup_start: dev = (253,16), pino = 3, name:testfile, flags:65537 > f2fs_io-921 [013] ..... 1049.855870: f2fs_submit_read_bio: dev = (253,16)/(253,16), rw = READ(), DATA, sector = 139280, size = 4096 > f2fs_io-921 [013] ..... 1049.856116: f2fs_submit_folio_bio: dev = (253,16), ino = 1, folio_index = 0x5, oldaddr = 0x5553, newaddr = 0x5553, rw = READ(), type = HOT_NODE > f2fs_io-921 [013] ..... 1049.856147: f2fs_submit_read_bio: dev = (253,16)/(253,16), rw = READ(), NODE, sector = 174744, size = 4096 > f2fs_io-921 [013] ..... 1049.856273: f2fs_iget: dev = (253,16), ino = 5, pino = 3, i_mode = 0x81ed, i_size = 7712768, i_nlink = 1, i_blocks = 15080, i_advise = 0x0 > f2fs_io-921 [013] ..... 1049.856305: f2fs_lookup_end: dev = (253,16), pino = 3, name:testfile, ino:5, err:0 > f2fs_io-921 [013] ..... 1049.856316: f2fs_lookup_extent_tree_start: dev = (253,16), ino = 5, pgofs = 0, type = Read > f2fs_io-921 [013] ..... 1049.856317: f2fs_lookup_read_extent_tree_end: dev = (253,16), ino = 5, pgofs = 0, read_ext_info(fofs: 0, len: 512, blk: 1055744) > f2fs_io-921 [013] ..... 1049.856317: f2fs_map_blocks: dev = (253,16), ino = 5, file offset = 0, start blkaddr = 0x101c00, len = 0x200, flags = 2, seg_type = 8, may_create = 0, multidevice = 0, flag = 6, err = 0 > f2fs_io-921 [013] ..... 1049.856318: f2fs_lookup_extent_tree_start: dev = (253,16), ino = 5, pgofs = 512, type = Read > f2fs_io-921 [013] ..... 1049.856318: f2fs_lookup_read_extent_tree_end: dev = (253,16), ino = 5, pgofs = 512, read_ext_info(fofs: 0, len: 0, blk: 0) > f2fs_io-921 [013] ..... 1049.856323: f2fs_update_read_extent_tree_range: dev = (253,16), ino = 5, pgofs = 512, len = 352, blkaddr = 18432, c_len = 0 > f2fs_io-921 [013] ..... 1049.856328: f2fs_submit_folio_bio: dev = (253,16), ino = 1, folio_index = 0x6, oldaddr = 0x5556, newaddr = 0x5556, rw = READ(), type = HOT_NODE > f2fs_io-921 [013] ..... 1049.856329: f2fs_submit_read_bio: dev = (253,16)/(253,16), rw = READ(), NODE, sector = 174768, size = 4096 > f2fs_io-921 [021] ..... 1049.856968: f2fs_update_read_extent_tree_range: dev = (253,16), ino = 5, pgofs = 864, len = 160, blkaddr = 18784, c_len = 0 > f2fs_io-921 [021] ..... 1049.857002: f2fs_map_blocks: dev = (253,16), ino = 5, file offset = 512, start blkaddr = 0x4800, len = 0x200, flags = 2, seg_type = 8, may_create = 0, multidevice = 0, flag = 6, err = 0 > f2fs_io-921 [021] ..... 1049.857003: f2fs_lookup_extent_tree_start: dev = (253,16), ino = 5, pgofs = 1025, type = Read > f2fs_io-921 [021] ..... 1049.857004: f2fs_lookup_read_extent_tree_end: dev = (253,16), ino = 5, pgofs = 1025, read_ext_info(fofs: 0, len: 0, blk: 0) > f2fs_io-921 [021] ..... 1049.857010: f2fs_update_read_extent_tree_range: dev = (253,16), ino = 5, pgofs = 1025, len = 511, blkaddr = 19457, c_len = 0 > f2fs_io-921 [021] ..... 1049.857011: f2fs_map_blocks: dev = (253,16), ino = 5, file offset = 1025, start blkaddr = 0x4c01, len = 0x1ff, flags = 2, seg_type = 8, may_create = 0, multidevice = 0, flag = 6, err = 0 > f2fs_io-921 [021] ..... 1049.857012: f2fs_lookup_extent_tree_start: dev = (253,16), ino = 5, pgofs = 1537, type = Read > f2fs_io-921 [021] ..... 1049.857012: f2fs_lookup_read_extent_tree_end: dev = (253,16), ino = 5, pgofs = 1537, read_ext_info(fofs: 0, len: 0, blk: 0) > f2fs_io-921 [021] ..... 1049.857016: f2fs_update_read_extent_tree_range: dev = (253,16), ino = 5, pgofs = 1537, len = 344, blkaddr = 20993, c_len = 0 > f2fs_io-921 [021] ..... 1049.857016: f2fs_map_blocks: dev = (253,16), ino = 5, file offset = 1537, start blkaddr = 0x5201, len = 0x158, flags = 2, seg_type = 8, may_create = 0, multidevice = 0, flag = 6, err = 0 > f2fs_io-921 [021] ..... 1049.857017: f2fs_lookup_extent_tree_start: dev = (253,16), ino = 5, pgofs = 1882, type = Read > f2fs_io-921 [021] ..... 1049.857017: f2fs_lookup_read_extent_tree_end: dev = (253,16), ino = 5, pgofs = 1882, read_ext_info(fofs: 0, len: 0, blk: 0) > f2fs_io-921 [021] ..... 1049.857024: f2fs_submit_folio_bio: dev = (253,16), ino = 1, folio_index = 0x7, oldaddr = 0x5555, newaddr = 0x5555, rw = READ(), type = HOT_NODE > f2fs_io-921 [021] ..... 1049.857026: f2fs_submit_read_bio: dev = (253,16)/(253,16), rw = READ(), NODE, sector = 174760, size = 4096 > f2fs_io-921 [021] ..... 1049.857156: f2fs_map_blocks: dev = (253,16), ino = 5, file offset = 1882, start blkaddr = 0x5201, len = 0x0, flags = 0, seg_type = 8, may_create = 0, multidevice = 0, flag = 6, err = 0 > > It seems f2fs_update_read_extent_tree_range() won't insert a zero-sized extent? > Or am I missing something? > > Thanks, >From the trace, it seems that the data layout is not like what I described? > > > > Fix it by skipping updating this kind of extent info. > > > > Signed-off-by: wangzijie > > --- > > fs/f2fs/data.c | 3 +++ > > 1 file changed, 3 insertions(+) > > > > diff --git a/fs/f2fs/data.c b/fs/f2fs/data.c > > index 7961e0ddf..b8bb71852 100644 > > --- a/fs/f2fs/data.c > > +++ b/fs/f2fs/data.c > > @@ -1649,6 +1649,9 @@ int f2fs_map_blocks(struct inode *inode, struct f2fs_map_blocks *map, int flag) > > > > switch (flag) { > > case F2FS_GET_BLOCK_PRECACHE: > > + if (__is_valid_data_blkaddr(map->m_pblk) && > > + start_pgofs - map->m_lblk == map->m_len) > > + map->m_flags &= ~F2FS_MAP_MAPPED; > > goto sync_out; > > case F2FS_GET_BLOCK_BMAP: > > map->m_pblk = 0; _______________________________________________ Linux-f2fs-devel mailing list Linux-f2fs-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/linux-f2fs-devel