On Wed, Jan 19, 2022 at 11:25:31AM +0900, Shin'ichiro Kawasaki wrote: > Test quota disable during btrfs balance and confirm it does not cause > kernel hang. This is a regression test for the problem reported to > linux-btrfs list [1]. The hang was recreated using the test case and > memory backed null_blk device with 5GB size as the scratch device. > > [1] https://lore.kernel.org/linux-btrfs/20220115053012.941761-1-shinichiro.kawasaki@xxxxxxx/ > > Signed-off-by: Shin'ichiro Kawasaki <shinichiro.kawasaki@xxxxxxx> Reviewed-by: Filipe Manana <fdmanana@xxxxxxxx> Looks good now, thanks. > --- > Changes from v2: > * Added wait for balance operation finish > > Changes from v1: > * Put more stress by repeating quota enable/disable and btrfs balance > * Reflected other comments on the list > > tests/btrfs/255 | 50 +++++++++++++++++++++++++++++++++++++++++++++ > tests/btrfs/255.out | 2 ++ > 2 files changed, 52 insertions(+) > create mode 100755 tests/btrfs/255 > create mode 100644 tests/btrfs/255.out > > diff --git a/tests/btrfs/255 b/tests/btrfs/255 > new file mode 100755 > index 00000000..74aa9769 > --- /dev/null > +++ b/tests/btrfs/255 > @@ -0,0 +1,50 @@ > +#! /bin/bash > +# SPDX-License-Identifier: GPL-2.0 > +# Copyright (c) 2022 Western Digital Corporation or its affiliates. > +# > +# FS QA Test No. btrfs/255 > +# > +# Confirm that disabling quota during balance does not hang > +# > +. ./common/preamble > +_begin_fstest auto qgroup balance > + > +# real QA test starts here > +_supported_fs btrfs > +_require_scratch > + > +_scratch_mkfs >> $seqres.full 2>&1 > +_scratch_mount > + > +# Fill 40% of the device or 2GB > +fill_percent=40 > +max_fillsize=$((2 * 1024 * 1024 * 1024)) > + > +devsize=$(($(_get_device_size $SCRATCH_DEV) * 512)) > +fillsize=$((devsize * fill_percent / 100)) > +((fillsize > max_fillsize)) && fillsize=$max_fillsize > + > +fs=$((4096 * 1024)) > +for ((i = 0; i * fs < fillsize; i++)); do > + dd if=/dev/zero of=$SCRATCH_MNT/file.$i bs=$fs count=1 \ > + >> $seqres.full 2>&1 > +done > + > +# Run btrfs balance and quota enable/disable in parallel > +_btrfs_stress_balance $SCRATCH_MNT >> $seqres.full & > +balance_pid=$! > +echo $balance_pid >> $seqres.full > +for ((i = 0; i < 20; i++)); do > + $BTRFS_UTIL_PROG quota enable $SCRATCH_MNT > + $BTRFS_UTIL_PROG quota disable $SCRATCH_MNT > +done > +kill $balance_pid &> /dev/null > +wait > +# wait for the balance operation to finish > +while ps aux | grep "balance start" | grep -qv grep; do > + sleep 1 > +done > + > +echo "Silence is golden" > +status=0 > +exit > diff --git a/tests/btrfs/255.out b/tests/btrfs/255.out > new file mode 100644 > index 00000000..7eefb828 > --- /dev/null > +++ b/tests/btrfs/255.out > @@ -0,0 +1,2 @@ > +QA output created by 255 > +Silence is golden > -- > 2.33.1 >
