tests/generic/352

#! /bin/bash
# FS QA Test 352
#
# Test fiemap ioctl on heavily deduped file
#
# This test case will check if reserved extent map searching go
# without problem and return correct SHARED flag.
# Which btrfs will soft lock up and return wrong shared flag.
#
#-----------------------------------------------------------------------
# Copyright (c) 2016 Fujitsu.  All Rights Reserved.
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License as
# published by the Free Software Foundation.
#
# This program is distributed in the hope that it would be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write the Free Software Foundation,
# Inc.,  51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
#-----------------------------------------------------------------------
#

seq=`basename $0`
seqres=$RESULT_DIR/$seq
echo "QA output created by $seq"

here=`pwd`
tmp=/tmp/$$
status=1	# failure is the default!
trap "_cleanup; exit \$status" 0 1 2 3 15

_cleanup()
{
	cd /
	rm -f $tmp.*
}

# get standard environment, filters and checks
. ./common/rc
. ./common/filter
. ./common/reflink
. ./common/punch

# remove previous $seqres.full before test
rm -f $seqres.full

# real QA test starts here

# Modify as appropriate.
_supported_fs generic
_supported_os Linux
_require_scratch_reflink
_require_xfs_io_command "fiemap"

_scratch_mkfs > /dev/null 2>&1
_scratch_mount

blocksize=$((128 * 1024))
file="$SCRATCH_MNT/tmp"

# Golden output is for $LOAD_FACTOR == 1 case
orig_nr=8192
orig_last_extent=$(($orig_nr * $blocksize / 512))
orig_end=$(($orig_last_extent + $blocksize / 512 - 1))

# Real output
nr=$(($orig_nr * $LOAD_FACTOR))
last_extent=$(($nr * $blocksize / 512))
end=$(($last_extent + $blocksize / 512 - 1))

# write the initial block for later reflink
_pwrite_byte 0xcdcdcdcd 0 $blocksize $file | _filter_xfs_io

# use reflink to create the rest of the file, whose all extents are all
# pointing to the first extent
for i in $(seq 1 $nr); do
	_reflink_range $file 0 $file $(($i * $blocksize)) $blocksize > /dev/null
done

# then call fiemap on that file to test both the shared flag and if
# reserved extent mapping search will cause soft lockup
$XFS_IO_PROG -c "fiemap -v" $file | _filter_fiemap_flags > $tmp.out
cat $tmp.out >> $seqres.full

# refact the $LOAD_FACTOR to 1 to match the golden output
sed -i -e "s/$(($last_extent - 1))/$(($orig_last_extent - 1))/" \
	-e "s/$last_extent/$orig_last_extent/" \
	-e "s/$end/$orig_end/" $tmp.out
cat $tmp.out

# success, all done
status=0
exit