From 73ca62e997ce7a341cf856d8d53add09eff9c9f8 Mon Sep 17 00:00:00 2001 From: Wang Xiaoguang Date: Fri, 23 Sep 2016 11:12:07 +0800 Subject: [PATCH] generic: truncate heavily reflinked file In btrfs, there is a bug about btrfs' truncate codes, it'll leak some fs space as the truncate operation proceeds. If this truncate operation is very large, later metadata request in this truncate operation may fail for enospc error. I also have sent a kernel patch fot btrfs to fix this issue. Signed-off-by: Wang Xiaoguang Reviewed-by: Eryu Guan Signed-off-by: Eryu Guan --- tests/generic/387 | 81 +++++++++++++++++++++++++++++++++++++++++++ tests/generic/387.out | 2 ++ tests/generic/group | 1 + 3 files changed, 84 insertions(+) create mode 100755 tests/generic/387 create mode 100644 tests/generic/387.out diff --git a/tests/generic/387 b/tests/generic/387 new file mode 100755 index 00000000..267c5fb3 --- /dev/null +++ b/tests/generic/387 @@ -0,0 +1,81 @@ +#! /bin/bash +# FS QA Test 387 +# +# Create a heavily reflinked file, then check whether we can truncate +# it correctly. +# +#----------------------------------------------------------------------- +# Copyright (c) 2016 Fujitsu. All Rights Reserved. +# +# 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" + +here=`pwd` +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 +. ./common/reflink + +# remove previous $seqres.full before test +rm -f $seqres.full + +# Modify as appropriate. +_supported_fs generic +_supported_os Linux +_require_scratch_reflink + +_scratch_mkfs_sized $((32 * 1024 * 1024)) >> $seqres.full 2>&1 +_scratch_mount + +testfile=$SCRATCH_MNT/testfile +dummyfile=$SCRATCH_MNT/dummyfile +blocksize=$((128 * 1024)) + +# create a dummy file, which is used to occupy some fs space first. +_pwrite_byte 0xcdcdcdcd 0 $((1 * 1024 * 1024)) $dummyfile > /dev/null +_pwrite_byte 0xcdcdcdcd 0 $blocksize $testfile > /dev/null + +echo "Silence is golden" +for ((i = 0; i < 16384; i++)); do + _reflink_range $testfile 0 $testfile $(($i * $blocksize)) \ + $blocksize > /dev/null 2>&1 +done + +# consume all remaining free space +dd if=/dev/zero of=$SCRATCH_MNT/space >/dev/null 2>&1 +sync + +# fs is full now and fs internal operations may need some free space, for +# example, in btrfs, transaction will need to reserve space first, so here free +# 1MB space. +rm -f $dummyfile +$XFS_IO_PROG -f -c "truncate 0" $testfile + +status=0 +exit diff --git a/tests/generic/387.out b/tests/generic/387.out new file mode 100644 index 00000000..2b4b0b42 --- /dev/null +++ b/tests/generic/387.out @@ -0,0 +1,2 @@ +QA output created by 387 +Silence is golden diff --git a/tests/generic/group b/tests/generic/group index ea2ced45..151d3671 100644 --- a/tests/generic/group +++ b/tests/generic/group @@ -389,3 +389,4 @@ 384 quota auto quick 385 quota auto quick 386 auto quick quota +387 auto clone -- 2.39.5