From patchwork Tue Nov 19 12:07:34 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Filipe Manana X-Patchwork-Id: 11251819 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id C6708186D for ; Tue, 19 Nov 2019 12:07:41 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id A6B8B222DC for ; Tue, 19 Nov 2019 12:07:41 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1574165261; bh=y4E0WuyuZ91ySw1UCy6y18nPDFZfWFLDnbp5T7N1DrY=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=d7zyVCBgzr4fdojioz4Ikl8yxf1CBPZGayDKPr0I7ejxkYM+Ywf/9RvdDr391FY9C sOB+yFBghsKSsxXb2A4OG4NLs/u7/ih3C+0D2ZDxb0tFJsm2Vj4btT+2iuX6hg4hyn wLdUEgS415qYWVmA7eBP375f6Xzk487B0FPyV0VU= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727903AbfKSMHl (ORCPT ); Tue, 19 Nov 2019 07:07:41 -0500 Received: from mail.kernel.org ([198.145.29.99]:40208 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727797AbfKSMHk (ORCPT ); Tue, 19 Nov 2019 07:07:40 -0500 Received: from localhost.localdomain (bl8-197-74.dsl.telepac.pt [85.241.197.74]) (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 7D047222DE; Tue, 19 Nov 2019 12:07:38 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1574165259; bh=y4E0WuyuZ91ySw1UCy6y18nPDFZfWFLDnbp5T7N1DrY=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=E5onmtdQKRFg/qjeypZNPURXmt3XkzK2g4KH8XAZwNgON2slW5StgNI3raKrBTlF8 EVbjCm4DTmUDounDuw9ef2HRCZ4nev7oeavA3vXUD05ooULGy5iVuEsGNeWe0WZTNv iZ51jWpeTY011dKUBbYp18Daw88zDFcOX3DYiwgM= From: fdmanana@kernel.org To: fstests@vger.kernel.org Cc: linux-btrfs@vger.kernel.org, Filipe Manana Subject: [PATCH v2] btrfs: test fsync after hole punching when using the no-holes feature Date: Tue, 19 Nov 2019 12:07:34 +0000 Message-Id: <20191119120734.27828-1-fdmanana@kernel.org> X-Mailer: git-send-email 2.11.0 In-Reply-To: <20191112151340.3688-1-fdmanana@kernel.org> References: <20191112151340.3688-1-fdmanana@kernel.org> Sender: linux-btrfs-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-btrfs@vger.kernel.org From: Filipe Manana Test that when we have the no-holes feature enabled and a specific metadata layout, if we punch a hole that starts at file offset 0 and fsync the file, after replaying the log the hole exists. This currently fails on btrfs but is fixed by a patch for the linux kernel with the following subject: "Btrfs: fix missing hole after hole punching and fsync when using NO_HOLES" Signed-off-by: Filipe Manana --- V2: Include tests for other cases involving the no-holes feature, hole punching and fsync. tests/btrfs/201 | 190 ++++++++++++++++++++++++++++++++++++++++++++++++++++ tests/btrfs/201.out | 24 +++++++ tests/btrfs/group | 1 + 3 files changed, 215 insertions(+) create mode 100755 tests/btrfs/201 create mode 100644 tests/btrfs/201.out diff --git a/tests/btrfs/201 b/tests/btrfs/201 new file mode 100755 index 00000000..72dc1aa5 --- /dev/null +++ b/tests/btrfs/201 @@ -0,0 +1,190 @@ +#! /bin/bash +# SPDX-License-Identifier: GPL-2.0 +# Copyright (C) 2019 SUSE Linux Products GmbH. All Rights Reserved. +# +# FSQA Test No. 201 +# +# Test that when we have the no-holes feature enabled and a specific metadata +# layout, if we punch a hole that starts at file offset 0 and fsync the file, +# after replaying the log the hole exists. +# +seq=`basename $0` +seqres=$RESULT_DIR/$seq +echo "QA output created by $seq" +tmp=/tmp/$$ +status=1 # failure is the default! +trap "_cleanup; exit \$status" 0 1 2 3 15 + +_cleanup() +{ + _cleanup_flakey + cd / + rm -f $tmp.* +} + +# get standard environment, filters and checks +. ./common/rc +. ./common/attr +. ./common/filter +. ./common/dmflakey + +# real QA test starts here +_supported_fs btrfs +_supported_os Linux +_require_scratch +_require_dm_target flakey +_require_attrs +_require_xfs_io_command "fpunch" +_require_btrfs_fs_feature "no_holes" +_require_btrfs_mkfs_feature "no-holes" +_require_odirect + +rm -f $seqres.full + +run_test_leading_hole() +{ + # We create the filesystem with a node size of 64Kb because we need to + # create a specific metadata layout in order to trigger the bug we are + # testing. At the moment the node size can not be smaller then the system's + # page size, so given that the largest possible page size is 64Kb and by + # default the node size is set to the system's page size value, we explicitly + # create a filesystem with a 64Kb node size, so that the test can run + # reliably independently of the system's page size. + _scratch_mkfs -O no-holes -n $((64 * 1024)) >>$seqres.full 2>&1 + _require_metadata_journaling $SCRATCH_DEV + _init_flakey + _mount_flakey + + # Create our first file, which is used just to fill space in a leaf. Its + # items ocuppy most of the first leaf. We use a large xattr since it's an + # easy and fast way to fill a lot of leaf space. + touch $SCRATCH_MNT/foo + $SETFATTR_PROG -n 'user.x1' -v $(printf '%0.sX' $(seq 1 63617)) \ + $SCRATCH_MNT/foo + + # Create our second file, which we will use to test if fsync persists a hole + # punch operation against it. Create several extent items for the file, all with + # a size of 64Kb. The first extent item of this file is located within the first + # leaf of the fs tree, as its last item, and all the remaining extent items in + # another leaf. + local offset=0 + for ((i = 0; i <= 10; i++)); do + $XFS_IO_PROG -f -d -c "pwrite -S 0xab -b 64K $offset 64K" \ + $SCRATCH_MNT/bar >/dev/null + offset=$(($offset + 64 * 1024)) + done + + # Make sure everything done so far is durably persisted. We also want to start + # a new transaction and bump the filesystem generation. We don't fsync because + # we want to keep the 'full sync' flag in the inode of file 'bar', so that the + # fsync after the hole punch operation uses the slow path, which is necessary + # to trigger the bug we are testing. + sync + + # Now punch a hole that covers only the first extent item of file bar. That + # is the only extent item in the first leaf of the first tree, so the hole + # punch operation will drop it and will not touch the second leaf which + # contains the remaining extent items. These conditions are necessary to + # trigger the bug we are testing. + $XFS_IO_PROG -c "fpunch 0 64K" -c "fsync" $SCRATCH_MNT/bar + + echo "File digest before power failure:" + md5sum $SCRATCH_MNT/bar | _filter_scratch + # Simulate a power failure and mount the filesystem to check that replaying the + # log tree succeeds and our file bar has the expected content. + _flakey_drop_and_remount + echo "File digest after power failure and log replay:" + md5sum $SCRATCH_MNT/bar | _filter_scratch + + _unmount_flakey + _cleanup_flakey +} + +run_test_middle_hole() +{ + local hole_offset=$1 + local hole_len=$2 + + # We create the filesystem with a node size of 64Kb because we need to + # create a specific metadata layout in order to trigger the bug we are + # testing. At the moment the node size can not be smaller then the system's + # page size, so given that the largest possible page size is 64Kb and by + # default the node size is set to the system's page size value, we explicitly + # create a filesystem with a 64Kb node size, so that the test can run + # reliably independently of the system's page size. + _scratch_mkfs -O no-holes -n $((64 * 1024)) >>$seqres.full 2>&1 + _require_metadata_journaling $SCRATCH_DEV + _init_flakey + _mount_flakey + + # Create our first file, which is used just to fill space in a leaf. Its + # items ocuppy most of the first leaf. We use a large xattr since it's an + # easy and fast way to fill a lot of leaf space. + touch $SCRATCH_MNT/foo + $SETFATTR_PROG -n 'user.x1' -v $(printf '%0.sX' $(seq 1 63600)) \ + $SCRATCH_MNT/foo + + # Create our second file, which we will use to test if fsync persists a hole + # punch operation against it. Create several extent items for the file, all + # with a size of 64Kb. The goal is to have the items of this file span 5 + # btree leafs. + offset=0 + for ((i = 0; i <= 2000; i++)); do + $XFS_IO_PROG -f -d -c "pwrite -S 0xab -b 64K $offset 64K" \ + $SCRATCH_MNT/bar >/dev/null + offset=$(($offset + 64 * 1024)) + done + + # Make sure everything done so far is durably persisted. We also want to + # start a new transaction and bump the filesystem generation. We don't fsync + # because we want to keep the 'full sync' flag in the inode of file 'bar', + # so that the fsync after the hole punch operation uses the slow path, which + # is necessary to trigger the bug we are testing. + sync + + # Now punch a hole that covers the entire 3rd leaf. This results in deleting + # the entire leaf, without touching the 2nd and 4th leafs. The first leaf is + # touched because the inode item needs to be updated (bytes used, ctime, + # mtime, etc). After that we modify the last extent, located at the 5th leaf, + # and then fsync the file. We want to verify that both the hole and the new + # data are correctly persisted by the fsync. + $XFS_IO_PROG -c "fpunch $hole_offset $hole_len" \ + -c "pwrite -S 0xf1 131072000 64K" \ + -c "fsync" $SCRATCH_MNT/bar >/dev/null + + echo "File digest before power failure:" + md5sum $SCRATCH_MNT/bar | _filter_scratch + # Simulate a power failure and mount the filesystem to check that replaying + # the log tree succeeds and our file bar has the expected content. + _flakey_drop_and_remount + echo "File digest after power failure and log replay:" + md5sum $SCRATCH_MNT/bar | _filter_scratch + + _unmount_flakey + _cleanup_flakey +} + + +echo "Testing with hole offset 0 hole length 65536" +run_test_leading_hole + +# Now test cases where file extent items span many leafs and we punch a large +# hole in the middle of the file, with the goal of getting an entire leaf +# deleted during the punch hole operation. We test 3 different ranges because +# depending on whether SELinux is enabled or not the layout of the items in +# the leafs varies slightly. + +echo +echo "Testing with hole offset 786432 hole length 54919168" +run_test_middle_hole 786432 54919168 + +echo +echo "Testing with hole offset 720896 hole length 54919168" +run_test_middle_hole 720896 54919168 + +echo +echo "Testing with hole offset 655360 hole length 54919168" +run_test_middle_hole 655360 54919168 + +status=0 +exit diff --git a/tests/btrfs/201.out b/tests/btrfs/201.out new file mode 100644 index 00000000..cd4a729e --- /dev/null +++ b/tests/btrfs/201.out @@ -0,0 +1,24 @@ +QA output created by 201 +Testing with hole offset 0 hole length 65536 +File digest before power failure: +e1e40ea5ab31cc36fb74830a6293eb2b SCRATCH_MNT/bar +File digest after power failure and log replay: +e1e40ea5ab31cc36fb74830a6293eb2b SCRATCH_MNT/bar + +Testing with hole offset 786432 hole length 54919168 +File digest before power failure: +8bfa78372c90f7418ce6a90ba3a92b7f SCRATCH_MNT/bar +File digest after power failure and log replay: +8bfa78372c90f7418ce6a90ba3a92b7f SCRATCH_MNT/bar + +Testing with hole offset 720896 hole length 54919168 +File digest before power failure: +327a10e71854c55a0439b859665a4fdd SCRATCH_MNT/bar +File digest after power failure and log replay: +327a10e71854c55a0439b859665a4fdd SCRATCH_MNT/bar + +Testing with hole offset 655360 hole length 54919168 +File digest before power failure: +2b060d70788a69e081013f0ce0e52921 SCRATCH_MNT/bar +File digest after power failure and log replay: +2b060d70788a69e081013f0ce0e52921 SCRATCH_MNT/bar diff --git a/tests/btrfs/group b/tests/btrfs/group index d56dcafa..d7eeb45d 100755 --- a/tests/btrfs/group +++ b/tests/btrfs/group @@ -203,3 +203,4 @@ 198 auto quick volume 199 auto quick trim 200 auto quick send clone +201 auto quick punch log