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#! /bin/bash
# SPDX-License-Identifier: GPL-2.0
# Copyright (c) 2017-2019 Red Hat, Inc. All Rights Reserved.
#
# FS QA Test No. 524
#
# Test XFS page writeback code for races with the cached file mapping. XFS
# caches the file -> block mapping for a full extent once it is initially looked
# up. The cached mapping is used for all subsequent pages in the same writeback
# cycle that cover the associated extent. Under certain conditions, it is
# possible for concurrent operations on the file to invalidate the cached
# mapping without the knowledge of writeback. Writeback ends up sending I/O to a
# partly stale mapping and potentially leaving delalloc blocks in the current
# mapping unconverted.
. ./common/preamble
_begin_fstest auto quick
# Import common functions.
# real QA test starts here
# Modify as appropriate.
_supported_fs generic
_require_scratch
_require_test_program "feature"
_require_xfs_io_command "sync_range"
_scratch_mkfs >> $seqres.full 2>&1 || _fail "mkfs failed"
_scratch_mount
file=$SCRATCH_MNT/file
filesize=$((1024 * 1024 * 32))
pagesize=`$here/src/feature -s`
truncsize=$((filesize - pagesize))
for i in $(seq 0 15); do
# Truncate the file and fsync to persist the final size on-disk. This is
# required so the subsequent truncate will not wait on writeback.
$XFS_IO_PROG -fc "truncate 0" $file
$XFS_IO_PROG -c "truncate $filesize" -c fsync $file
# create a small enough delalloc extent to likely be contiguous
$XFS_IO_PROG -c "pwrite 0 $filesize" $file >> $seqres.full 2>&1
# Start writeback and a racing truncate and rewrite of the final page.
$XFS_IO_PROG -c "sync_range -w 0 0" $file &
sync_pid=$!
$XFS_IO_PROG -c "truncate $truncsize" \
-c "pwrite $truncsize $pagesize" $file >> $seqres.full 2>&1
# If the test fails, the most likely outcome is an sb_fdblocks mismatch
# and/or an associated delalloc assert failure on inode reclaim. Cycle
# the mount to trigger detection.
wait $sync_pid
_scratch_cycle_mount
done
echo Silence is golden
# success, all done
status=0
exit
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