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