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#! /bin/bash
# SPDX-License-Identifier: GPL-2.0
# Copyright (C) 2024 SUSE Linux Products GmbH. All Rights Reserved.
#
# FS QA Test 310
#
# Make sure reading on an compressed inline extent is behaving correctly
#
. ./common/preamble
_begin_fstest auto quick compress
_supported_fs btrfs
_require_scratch
# This test require inlined compressed extents creation, and all the writes
# are designed for 4K sector size.
_require_btrfs_inline_extents_creation
_require_btrfs_support_sectorsize 4096
_fixed_by_kernel_commit e01a83e12604 \
"Revert \"btrfs: zstd: fix and simplify the inline extent decompression\""
# The correct md5 for the correct 4K file filled with "0xcd"
md5sum_correct="5fed275e7617a806f94c173746a2a723"
workload()
{
local algo="$1"
echo "=== Testing compression algorithm ${algo} ===" >> $seqres.full
_scratch_mkfs >> $seqres.full
_scratch_mount -o compress=${algo}
_pwrite_byte 0xcd 0 4k "$SCRATCH_MNT/inline_file" > /dev/null
result=$(_md5_checksum "$SCRATCH_MNT/inline_file")
echo "after initial write, md5sum=${result}" >> $seqres.full
if [ "$result" != "$md5sum_correct" ]; then
_fail "initial write results incorrect content for \"$algo\""
fi
# Writeback data to get correct fiemap result, or we got FIEMAP_DEALLOC
# without compression/inline flags.
sync
$XFS_IO_PROG -c "fiemap -v" $SCRATCH_MNT/inline_file | tail -n 1 > $tmp.fiemap
cat $tmp.fiemap >> $seqres.full
# Make sure we got an inlined compressed file extent.
# 0x200 means inlined, 0x100 means not block aligned, 0x8 means encoded
# (compressed in this case), and 0x1 means the last extent.
if ! grep -q "0x309" $tmp.fiemap; then
rm -f -- $tmp.fiemap
_notrun "No compressed inline extent created, maybe subpage?"
fi
rm -f -- $tmp.fiemap
# Unmount to clear the page cache.
_scratch_cycle_mount
# For v6.8-rc1 without the revert or the newer fix, this would
# lead to VM_BUG_ON() thus crash
result=$(_md5_checksum "$SCRATCH_MNT/inline_file")
echo "after cycle mount, md5sum=${result}" >> $seqres.full
if [ "$result" != "$md5sum_correct" ]; then
_fail "read for compressed inline extent failed for \"$algo\""
fi
_scratch_unmount
_check_scratch_fs
}
algo_list=($(_btrfs_compression_algos))
for algo in ${algo_list[@]}; do
workload $algo
done
echo "Silence is golden"
status=0
exit
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