From 7d059370d24a606227a6f1e96f30f2f334e0dcc5 Mon Sep 17 00:00:00 2001 From: Filipe Manana Date: Fri, 28 Jun 2019 23:08:36 +0100 Subject: [PATCH] generic: test cloning large exents to a file with many small extents Test that if we clone a file with some large extents into a file that has many small extents, when the fs is nearly full, the clone operation does not fail and produces the correct result. This is motivated by a bug found in btrfs wich is fixed by the following patches for the linux kernel: [PATCH 1/2] Btrfs: factor out extent dropping code from hole punch handler [PATCH 2/2] Btrfs: fix ENOSPC errors, leading to transaction aborts, when cloning extents The test currently passes on xfs. Signed-off-by: Filipe Manana Reviewed-by: Eryu Guan Signed-off-by: Eryu Guan --- tests/generic/562 | 78 +++++++++++++++++++++++++++++++++++++++++++ tests/generic/562.out | 5 +++ tests/generic/group | 1 + 3 files changed, 84 insertions(+) create mode 100755 tests/generic/562 create mode 100644 tests/generic/562.out diff --git a/tests/generic/562 b/tests/generic/562 new file mode 100755 index 00000000..7322612f --- /dev/null +++ b/tests/generic/562 @@ -0,0 +1,78 @@ +#! /bin/bash +# SPDX-License-Identifier: GPL-2.0 +# Copyright (C) 2019 SUSE Linux Products GmbH. All Rights Reserved. +# +# FSQA Test No. 562 +# +# Test that if we clone a file with some large extents into a file that has +# many small extents, when the fs is nearly full, the clone operation does +# not fail and produces the correct result. +# +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 +. ./common/reflink + +# real QA test starts here +_supported_fs generic +_supported_os Linux +_require_scratch_reflink +_require_test_program "punch-alternating" +_require_xfs_io_command "fpunch" + +rm -f $seqres.full + +_scratch_mkfs_sized $((512 * 1024 * 1024)) >>$seqres.full 2>&1 +_scratch_mount + +file_size=$(( 200 * 1024 * 1024 )) # 200Mb + +# Create a file with many small extents. +$XFS_IO_PROG -f -c "pwrite -S 0xe5 -b $file_size 0 $file_size" \ + $SCRATCH_MNT/foo >>/dev/null +$here/src/punch-alternating $SCRATCH_MNT/foo >> $seqres.full + +# Create file bar with the same size that file foo has but with large extents. +$XFS_IO_PROG -f -c "pwrite -S 0xc7 -b $file_size 0 $file_size" \ + $SCRATCH_MNT/bar >>/dev/null + +# Fill the fs (For btrfs we are interested in filling all unallocated space +# and most of the existing metadata block group(s), so that after this there +# will be no unallocated space and metadata space will be mostly full but with +# more than enough free space for the clone operation below to succeed, we +# create files with 2Kb because that results in extents inlined in the metadata +# (btree leafs) and it's the fastest way to fill metadata space on btrfs, by +# default btrfs inlines up to 2Kb of data). +i=1 +while true; do + $XFS_IO_PROG -f -c "pwrite 0 2K" $SCRATCH_MNT/filler_$i &> /dev/null + [ $? -ne 0 ] && break + i=$(( i + 1 )) +done + +# Now clone file bar into file foo. This is supposed to succeed and not fail +# with ENOSPC for example. +_reflink $SCRATCH_MNT/bar $SCRATCH_MNT/foo >>$seqres.full + +# Unmount and mount the filesystem again to verify the operation was durably +# persisted. +_scratch_cycle_mount + +echo "File foo data after cloning and remount:" +od -A d -t x1 $SCRATCH_MNT/foo + +status=0 +exit diff --git a/tests/generic/562.out b/tests/generic/562.out new file mode 100644 index 00000000..0ac87fe2 --- /dev/null +++ b/tests/generic/562.out @@ -0,0 +1,5 @@ +QA output created by 562 +File foo data after cloning and remount: +0000000 c7 c7 c7 c7 c7 c7 c7 c7 c7 c7 c7 c7 c7 c7 c7 c7 +* +209715200 diff --git a/tests/generic/group b/tests/generic/group index c30d18e0..9ceaf317 100644 --- a/tests/generic/group +++ b/tests/generic/group @@ -564,3 +564,4 @@ 559 auto stress dedupe 560 auto stress dedupe 561 auto stress dedupe +562 auto clone -- 2.30.2