mirror of
https://github.com/linux-apfs/apfstests.git
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Dave Chinner
1ff4192932
Fully scripted conversion, see script in initial SPDX license commit message. Signed-off-by: Dave Chinner <dchinner@redhat.com>
78 lines
2.1 KiB
Bash
Executable File
78 lines
2.1 KiB
Bash
Executable File
#! /bin/bash
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# SPDX-License-Identifier: GPL-2.0
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# Copyright (c) 2016 Fujitsu. All Rights Reserved.
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#
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# FS QA Test 130
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#
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# Check if btrfs send can handle large deduped file, whose file extents
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# are all pointing to one extent.
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# Such file structure will cause quite large pressure to any operation which
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# iterates all backref of one extent.
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# And unfortunately, btrfs send is one of these operations, and will cause
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# softlock or OOM on systems with small memory(<4G).
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#
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seq=`basename $0`
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seqres=$RESULT_DIR/$seq
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echo "QA output created by $seq"
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here=`pwd`
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tmp=/tmp/$$
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status=1 # failure is the default!
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trap "_cleanup; exit \$status" 0 1 2 3 15
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_cleanup()
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{
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cd /
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rm -f $tmp.*
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}
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# get standard environment, filters and checks
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. ./common/rc
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. ./common/filter
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. ./common/reflink
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# remove previous $seqres.full before test
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rm -f $seqres.full
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# real QA test starts here
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# Modify as appropriate.
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_supported_fs btrfs
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_supported_os Linux
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_require_scratch
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_require_scratch_reflink
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_scratch_mkfs > /dev/null 2>&1
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_scratch_mount
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nr_extents=$((256 * $LOAD_FACTOR))
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# Use 128K blocksize, the default value of both deduperemove or
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# inband dedupe
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blocksize=$((128 * 1024))
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file=$SCRATCH_MNT/foobar
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echo LOAD_FACTOR=$LOAD_FACTOR nr_extents=$nr_extents blocksize=$blocksize >> $seqres.full
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# create the initial file, whose file extents are all point to one extent
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_pwrite_byte 0xcdcdcdcd 0 $blocksize $file | _filter_xfs_io
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for i in $(seq 1 $(($nr_extents - 1))); do
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_reflink_range $file 0 $file $(($i * $blocksize)) $blocksize \
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>> $seqres.full 2>&1
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done
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# create a RO snapshot, so we can send out the snapshot
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_run_btrfs_util_prog subvolume snapshot -r $SCRATCH_MNT $SCRATCH_MNT/ro_snap
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# send out the subvolume, and it will either:
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# 1) OOM since memory is allocated inside a O(n^3) loop
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# 2) Softlock since time consuming backref walk is called without scheduling.
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# the send destination is not important, just send will cause the problem
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echo "# $BTRFS_UTIL_PROG send $SCRATCH_MNT/ro_snap > /dev/null" >> $seqres.full
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$BTRFS_UTIL_PROG send $SCRATCH_MNT/ro_snap > /dev/null 2>>$seqres.full
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# success, all done
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status=0
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exit
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