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#! /bin/bash
# SPDX-License-Identifier: GPL-2.0
# Copyright (C) 2019 SUSE Linux Products GmbH. All Rights Reserved.
#
# FS QA Test 194
#
# Test if btrfs can handle large device ids.
#
# The regression is introduced by kernel commit ab4ba2e13346 ("btrfs:
# tree-checker: Verify dev item").
# The fix is titled: "btrfs: tree-checker: Fix wrong check on max devid"
#
. ./common/preamble
_begin_fstest auto volume
. ./common/filter
_supported_fs btrfs
_require_scratch_dev_pool 2
_scratch_dev_pool_get 2
# Here we use 4k node size to reduce runtime (explained near _scratch_mkfs call)
# To use the minimal node size (4k) we need 4K page size.
_require_btrfs_support_sectorsize 4096
device_1=$(echo $SCRATCH_DEV_POOL | $AWK_PROG '{print $1}')
device_2=$(echo $SCRATCH_DEV_POOL | $AWK_PROG '{print $2}')
echo device_1=$device_1 device_2=$device_2 >> $seqres.full
# The wrong check limit is based on the max item size (BTRFS_MAX_DEVS() macro),
# and max item size is based on node size, so smaller node size will result
# much shorter runtime. So here we use minimal node size (4K) to reduce runtime.
_scratch_mkfs -n 4k -s 4k >> $seqres.full
_scratch_mount
# For 4k nodesize, the wrong limit is calculated by:
# ((4096 - 101 - 25 - 80) / 32) + 1
# | | | | |- sizeof(btrfs_stripe)
# | | | |- sizeof(btrfs_chunk)
# | | |- sizeof(btrfs_item)
# | |- sizeof(btrfs_header)
# |- node size
# Which is 122.
#
# The old limit is wrong because it doesn't take devid holes into consideration.
# We can have large devid, but still have only 1 device.
#
# Add and remove device in a loop, each iteration will increase devid by 2.
# So by 64 iterations, we will definitely hit that 122 limit.
for (( i = 0; i < 64; i++ )); do
$BTRFS_UTIL_PROG device add -f $device_2 $SCRATCH_MNT >> $seqres.full
$BTRFS_UTIL_PROG device del $device_1 $SCRATCH_MNT
$BTRFS_UTIL_PROG device add -f $device_1 $SCRATCH_MNT >> $seqres.full
$BTRFS_UTIL_PROG device del $device_2 $SCRATCH_MNT
done | grep -v 'Resetting device zone'
_scratch_dev_pool_put
echo "Silence is golden"
# success, all done
status=0
exit
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