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#! /bin/bash
# SPDX-License-Identifier: GPL-2.0
# Copyright (c) 2021 Chandan Babu R. All Rights Reserved.
#
# FS QA Test 535
#
# Verify that XFS does not cause inode fork's extent count to overflow when
# writing to a shared extent.
. ./common/preamble
_begin_fstest auto quick clone unshare
# Import common functions.
. ./common/filter
. ./common/reflink
. ./common/inject
# real QA test starts here
_supported_fs xfs
_require_scratch
_require_scratch_reflink
_require_xfs_debug
_require_xfs_io_command "reflink"
_require_xfs_io_command "funshare"
_require_xfs_io_error_injection "reduce_max_iextents"
echo "Format and mount fs"
_scratch_mkfs_sized $((512 * 1024 * 1024)) >> $seqres.full
_scratch_mount >> $seqres.full
bsize=$(_get_block_size $SCRATCH_MNT)
nr_blks=15
srcfile=${SCRATCH_MNT}/srcfile
dstfile=${SCRATCH_MNT}/dstfile
touch $srcfile
touch $dstfile
echo "Inject reduce_max_iextents error tag"
_scratch_inject_error reduce_max_iextents 1
echo "Create a \$srcfile having an extent of length $nr_blks blocks"
$XFS_IO_PROG -f -c "pwrite -b $((nr_blks * bsize)) 0 $((nr_blks * bsize))" \
-c fsync $srcfile >> $seqres.full
echo "* Write to shared extent"
echo "Share the extent with \$dstfile"
_reflink $srcfile $dstfile >> $seqres.full
echo "Buffered write to every other block of \$dstfile's shared extent"
for i in $(seq 1 2 $((nr_blks - 1))); do
$XFS_IO_PROG -f -s -c "pwrite $((i * bsize)) $bsize" $dstfile \
>> $seqres.full 2>&1
[[ $? != 0 ]] && break
done
echo "Verify \$dstfile's extent count"
nextents=$(_xfs_get_fsxattr nextents $dstfile)
if (( $nextents > 10 )); then
echo "Extent count overflow check failed: nextents = $nextents"
exit 1
fi
echo "Disable reduce_max_iextents error tag"
_scratch_inject_error reduce_max_iextents 0
rm $dstfile
echo "* Funshare shared extent"
touch $dstfile
echo "Inject reduce_max_iextents error tag"
_scratch_inject_error reduce_max_iextents 1
echo "Share the extent with \$dstfile"
_reflink $srcfile $dstfile >> $seqres.full
echo "Funshare every other block of \$dstfile's shared extent"
for i in $(seq 1 2 $((nr_blks - 1))); do
$XFS_IO_PROG -f -s -c "funshare $((i * bsize)) $bsize" $dstfile \
>> $seqres.full 2>&1
[[ $? != 0 ]] && break
done
echo "Verify \$dstfile's extent count"
nextents=$(_xfs_get_fsxattr nextents $dstfile)
if (( $nextents > 10 )); then
echo "Extent count overflow check failed: nextents = $nextents"
exit 1
fi
# success, all done
status=0
exit
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