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#! /bin/bash
# SPDX-License-Identifier: GPL-2.0
# Copyright (c) 2018 Red Hat, Inc. All Rights Reserved.
#
# FS QA Test 443
#
# Regression test for the XFS rmapbt based extent swap algorithm. The extent
# swap algorithm for rmapbt=1 filesystems unmaps/remaps individual extents to
# rectify the rmapbt for each extent swapped between inodes. If one of the
# inodes happens to straddle the extent <-> btree format boundary (which can
# vary depending on inode size), the unmap/remap sequence can bounce the inodes
# back and forth between formats many times during the swap. Since extent ->
# btree format conversion requires a block allocation, this can consume more
# blocks than expected, lead to block reservation overrun and free space
# accounting inconsistency.
#
. ./common/preamble
_begin_fstest auto quick ioctl fsr punch fiemap prealloc
# Import common functions.
. ./common/filter
. ./common/punch
# real QA test starts here
# Modify as appropriate.
_supported_fs generic
_require_scratch
_require_test_program "punch-alternating"
_require_xfs_io_command "falloc"
_require_xfs_io_command "fpunch"
_require_xfs_io_command "swapext"
_require_xfs_io_command "fiemap"
_scratch_mkfs | _filter_mkfs >> $seqres.full 2> $tmp.mkfs
_scratch_mount
# get fs block size
. $tmp.mkfs
file1=$SCRATCH_MNT/file1
file2=$SCRATCH_MNT/file2
# The goal is run an extent swap where one of the associated files has the
# minimum number of extents to remain in btree format. First, create a couple
# files with large enough extent counts (200 or so should be plenty) to ensure
# btree format on the largest possible inode size filesystems.
$XFS_IO_PROG -fc "falloc 0 $((400 * dbsize))" $file1
$here/src/punch-alternating $file1
$XFS_IO_PROG -fc "falloc 0 $((400 * dbsize))" $file2
$here/src/punch-alternating $file2
# Now run an extent swap at every possible extent count down to 0. Depending on
# inode size, one of these swaps will cover the boundary case between extent and
# btree format.
for i in $(seq 1 2 399); do
# punch one extent from the tmpfile and swap
$XFS_IO_PROG -c "fpunch $((i * dbsize)) $dbsize" $file2
$XFS_IO_PROG -c "swapext $file2" $file1
# punch the same extent from the old fork (now in file2) to resync the
# extent counts and repeat
$XFS_IO_PROG -c "fpunch $((i * dbsize)) $dbsize" $file2
done
# sanity check that no extents are left over
$XFS_IO_PROG -c "fiemap" $file1 | _filter_fiemap
$XFS_IO_PROG -c "fiemap" $file2 | _filter_fiemap
# failure results in fs corruption and possible assert failure
echo Silence is golden
# success, all done
status=0
exit
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