From patchwork Wed Nov 4 10:09:36 2015 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Filipe Manana X-Patchwork-Id: 7548641 Return-Path: X-Original-To: patchwork-linux-btrfs@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork2.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.136]) by patchwork2.web.kernel.org (Postfix) with ESMTP id F3D84BF90C for ; Wed, 4 Nov 2015 10:09:50 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id EFB5C206B2 for ; Wed, 4 Nov 2015 10:09:49 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id C9B90206BE for ; Wed, 4 Nov 2015 10:09:48 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S964844AbbKDKJp (ORCPT ); Wed, 4 Nov 2015 05:09:45 -0500 Received: from mail.kernel.org ([198.145.29.136]:45518 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932554AbbKDKJn (ORCPT ); Wed, 4 Nov 2015 05:09:43 -0500 Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 28508206B2; Wed, 4 Nov 2015 10:09:42 +0000 (UTC) Received: from debian3.lan (bl8-199-62.dsl.telepac.pt [85.241.199.62]) (using TLSv1.2 with cipher AES128-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 8908F206B8; Wed, 4 Nov 2015 10:09:40 +0000 (UTC) From: fdmanana@kernel.org To: fstests@vger.kernel.org Cc: linux-btrfs@vger.kernel.org, Filipe Manana Subject: [PATCH] fstests: test for btrfs direct IO write against compressed extent Date: Wed, 4 Nov 2015 10:09:36 +0000 Message-Id: <1446631776-9120-1-git-send-email-fdmanana@kernel.org> X-Mailer: git-send-email 2.1.3 X-Spam-Status: No, score=-6.9 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_HI, T_RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP Sender: linux-btrfs-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-btrfs@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP From: Filipe Manana Test that doing a direct IO write against a file range that contains one prealloc extent and one compressed extent works correctly. From the linux kernel 4.0 onwards, this either triggered an assertion failure (leading to a BUG_ON) when CONFIG_BTRFS_ASSERT=y or resulted in an arithmetic underflow of an inode's space reservation for write operations. That issue is fixed by the following linux kernel patch: "Btrfs: fix extent accounting for partial direct IO writes" Signed-off-by: Filipe Manana --- tests/btrfs/114 | 108 ++++++++++++++++++++++++++++++++++++++++++++++++++++ tests/btrfs/114.out | 15 ++++++++ tests/btrfs/group | 1 + 3 files changed, 124 insertions(+) create mode 100755 tests/btrfs/114 create mode 100644 tests/btrfs/114.out diff --git a/tests/btrfs/114 b/tests/btrfs/114 new file mode 100755 index 0000000..915d1e8 --- /dev/null +++ b/tests/btrfs/114 @@ -0,0 +1,108 @@ +#! /bin/bash +# FSQA Test No. 114 +# +# Test that doing a direct IO write against a file range that contains one +# prealloc extent and one compressed extent works correctly. +# +#----------------------------------------------------------------------- +# +# Copyright (C) 2015 SUSE Linux Products GmbH. All Rights Reserved. +# Author: Filipe Manana +# +# This program is free software; you can redistribute it and/or +# modify it under the terms of the GNU General Public License as +# published by the Free Software Foundation. +# +# This program is distributed in the hope that it would be useful, +# but WITHOUT ANY WARRANTY; without even the implied warranty of +# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +# GNU General Public License for more details. +# +# You should have received a copy of the GNU General Public License +# along with this program; if not, write the Free Software Foundation, +# Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA +#----------------------------------------------------------------------- +# + +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() +{ + cd / + rm -f $tmp.* +} + +# get standard environment, filters and checks +. ./common/rc +. ./common/filter + +# real QA test starts here +_need_to_be_root +_supported_fs btrfs +_supported_os Linux +_require_scratch +_require_xfs_io_command "falloc" + +rm -f $seqres.full + +_scratch_mkfs >>$seqres.full 2>&1 +_scratch_mount "-o compress" + +# Create a compressed extent covering the range [700K, 800K[. +$XFS_IO_PROG -f -s -c "pwrite -S 0xaa -b 100K 700K 100K" $SCRATCH_MNT/foo \ + | _filter_xfs_io + +# Create prealloc extent covering the range [600K, 700K[. +$XFS_IO_PROG -c "falloc 600K 100K" $SCRATCH_MNT/foo + +# Write 80K of data to the range [640K, 720K[ using direct IO. This range covers +# both the prealloc extent and the compressed extent. Because there's a +# compressed extent in the range we are writing to, the DIO write code path ends +# up only writing the first 60k of data, which goes to the prealloc extent, and +# then falls back to buffered IO for writing the remaining 20K of data - because +# that remaining data maps to a file range containing a compressed extent. +# When falling back to buffered IO, we used to trigger an assertion when +# releasing reserved space due to bad accounting of the inode's outstanding +# extents counter, which was set to 1 but we ended up decrementing it by 1 twice, +# once through the ordered extent for the 60K of data we wrote using direct IO, +# and once through the main direct IO handler (inode.cbtrfs_direct_IO()) because +# the direct IO write wrote less than 80K of data (60K). +$XFS_IO_PROG -d -c "pwrite -S 0xbb -b 80K 640K 80K" $SCRATCH_MNT/foo \ + | _filter_xfs_io + +# Now similar test as above but for very large write operations. This triggers +# special cases for an inode's outstanding extents accounting, as internally +# btrfs logically splits extents into 128Mb units. +$XFS_IO_PROG -f -s \ + -c "pwrite -S 0xaa -b 128M 258M 128M" \ + -c "falloc 0 258M" \ + $SCRATCH_MNT/bar | _filter_xfs_io +$XFS_IO_PROG -d -c "pwrite -S 0xbb -b 256M 3M 256M" $SCRATCH_MNT/bar \ + | _filter_xfs_io + +# Now verify the file contents are correct and that they are the same even after +# unmounting and mounting the fs again (or evicting the page cache). +# +# For file foo, all bytes in the range [0, 640K[ must have a value of 0x00, all +# bytes in the range [640K, 720K[ must have a value of 0xbb and all bytes in the +# range [720K, 800K[ must have a value of 0xaa. +# +# For file bar, all bytes in the range [0, 3M[ must havea value of 0x00, all +# bytes in the range [3M, 259M[ must have a value of 0xbb and all bytes in the +# range [259M, 386M[ must have a value of 0xaa. +# +echo "File digests before remounting the file system:" +md5sum $SCRATCH_MNT/foo | _filter_scratch +md5sum $SCRATCH_MNT/bar | _filter_scratch +_scratch_remount +echo "File digests after remounting the file system:" +md5sum $SCRATCH_MNT/foo | _filter_scratch +md5sum $SCRATCH_MNT/bar | _filter_scratch + +status=0 +exit diff --git a/tests/btrfs/114.out b/tests/btrfs/114.out new file mode 100644 index 0000000..a2d7e89 --- /dev/null +++ b/tests/btrfs/114.out @@ -0,0 +1,15 @@ +QA output created by 114 +wrote 102400/102400 bytes at offset 716800 +XXX Bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec) +wrote 81920/81920 bytes at offset 655360 +XXX Bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec) +wrote 134217728/134217728 bytes at offset 270532608 +XXX Bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec) +wrote 268435456/268435456 bytes at offset 3145728 +XXX Bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec) +File digests before remounting the file system: +647d815906324ccdf288c7681f900ec0 SCRATCH_MNT/foo +5876dba1217b4c2915cda86f4c67640e SCRATCH_MNT/bar +File digests after remounting the file system: +647d815906324ccdf288c7681f900ec0 SCRATCH_MNT/foo +5876dba1217b4c2915cda86f4c67640e SCRATCH_MNT/bar diff --git a/tests/btrfs/group b/tests/btrfs/group index 7cf7dd7..04bc884 100644 --- a/tests/btrfs/group +++ b/tests/btrfs/group @@ -116,3 +116,4 @@ 111 auto quick send 112 auto quick clone 113 auto quick compress clone +114 auto quick compress prealloc