| #! /bin/bash |
| # SPDX-License-Identifier: GPL-2.0 |
| # Copyright (c) 2017 Facebook. All Rights Reserved. |
| # |
| # FS QA Test 10 |
| # |
| # Test delayed allocation with a large number of extents that are merged. |
| # Regression test for patch "Btrfs: fix delalloc accounting leak caused |
| # by u32 overflow". |
| # |
| 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 |
| |
| test_file="$TEST_DIR/$seq" |
| |
| _cleanup() |
| { |
| cd / |
| rm -f $tmp.* "$test_file" |
| } |
| |
| . ./common/rc |
| . ./common/filter |
| |
| rm -f $seqres.full |
| |
| _supported_fs btrfs |
| _require_test |
| _require_btrfs_fs_sysfs |
| |
| # Create 32k extents. All of these extents will be accounted as outstanding and |
| # reserved. |
| for ((i = 0; i < 32 * 1024; i++)); do |
| $XFS_IO_PROG -f -c "pwrite $((2 * 4096 * i)) 4096" "$test_file" >>"$seqres.full" |
| done |
| |
| # Fill in the gaps between the created extents. The outstanding extents will |
| # all be merged into 1, but there will still be 32k reserved. |
| for ((i = 0; i < 32 * 1024; i++)); do |
| $XFS_IO_PROG -f -c "pwrite $((2 * 4096 * i + 4096)) 4096" "$test_file" >>"$seqres.full" |
| done |
| |
| # Flush the delayed allocations. |
| sync |
| |
| # Make sure that we didn't leak any metadata space. |
| uuid="$(findmnt -n -o UUID "$TEST_DIR")" |
| cd "/sys/fs/btrfs/$uuid/allocation" |
| echo "$(($(cat metadata/bytes_may_use) - $(cat global_rsv_reserved))) bytes leaked" | grep -v '^0 ' |
| |
| echo "Silence is golden" |
| |
| status=0 |
| exit |