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>
106 lines
3.0 KiB
Bash
Executable File
106 lines
3.0 KiB
Bash
Executable File
#! /bin/bash
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# SPDX-License-Identifier: GPL-2.0
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# Copyright (c) 2017 SUSE Linux Products GmbH. All Rights Reserved.
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#
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# FS QA Test 156
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#
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# Check if btrfs can correctly trim free space in block groups
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#
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# An ancient regression prevent btrfs from trimming free space inside
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# existing block groups, if bytenr of block group starts beyond
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# btrfs_super_block->total_bytes.
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# However all bytenr in btrfs is in btrfs logical address space,
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# where any bytenr in range [0, U64_MAX] is valid.
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#
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# Fixed by patch named "btrfs: Ensure btrfs_trim_fs can trim the whole fs".
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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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# remove previous $seqres.full before test
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rm -f $seqres.full
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# real QA test starts here
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# Modify as appropriate.
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_supported_fs btrfs
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_supported_os Linux
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_require_scratch
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_require_fstrim
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# 1024fs size
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fs_size=$((1024 * 1024 * 1024))
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# Use small files to fill half of the fs
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file_size=$(( 1024 * 1024 ))
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nr_files=$(( $fs_size / $file_size / 2))
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# Force to use single data and meta profile.
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# Since the test relies on fstrim output, which will differ for different
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# profiles
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_scratch_mkfs -b $fs_size -m single -d single > /dev/null
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_scratch_mount
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_require_batched_discard "$SCRATCH_MNT"
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for n in $(seq -w 0 $(( $nr_files - 1))); do
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$XFS_IO_PROG -f -c "pwrite 0 $file_size" "$SCRATCH_MNT/file_$n" \
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> /dev/null
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done
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# Flush all buffer data into disk, to trigger chunk allocation
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sync
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# Now we have take at least 50% of the filesystem, relocate all chunks twice
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# so all chunks will start after 1G in logical space.
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# (Btrfs chunk allocation will not rewind to reuse lower space)
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_run_btrfs_util_prog balance start --full-balance "$SCRATCH_MNT"
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# To avoid possible false ENOSPC alert on v4.15-rc1, seems to be a
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# reserved space related bug (maybe related to outstanding space rework?),
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# but that's another story.
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sync
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_run_btrfs_util_prog balance start --full-balance "$SCRATCH_MNT"
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# Now remove half of the files to make some holes for later trim.
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# While still keep the chunk space fragmented, so no chunk will be freed
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rm $SCRATCH_MNT/file_*[13579] -f
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# Make sure space is freed
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sync
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trimmed=$($FSTRIM_PROG -v "$SCRATCH_MNT" | _filter_fstrim)
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echo "Trimmed=$trimmed total_size=$fs_size ratio=$(($trimmed * 100 / $fs_size))%" \
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>> $seqres.full
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# For correct full fs trim, both unallocated space (less than 50%)
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# and free space in existing block groups (about 25%) should be trimmed.
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# If less than 50% is trimmed, then only unallocated space is trimmed.
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# BTW, without fix only 31% can be trimmed, while after fix it's 64%.
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if [ $trimmed -lt $(( $fs_size / 2)) ]; then
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echo "Free space in block groups not trimmed"
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echo "Trimmed=$trimmed total_size=$fs_size ratio=$(($trimmed * 100 / $fs_size))%"
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fi
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echo "Silence is golden"
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# success, all done
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status=0
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exit
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