#! /bin/bash
# FS QA Test No. 274
#
# preallocation test:
# Preallocate space to a file, and fill the rest of the fs to 100%.
# Then test a write into that preallocated space, which should succeed.
#
#-----------------------------------------------------------------------
# Copyright (c) 2011-2012 Fujitsu, Inc.  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
#
#-----------------------------------------------------------------------
#
#creator
owner=wu.bo@cn.fujitsu.com

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

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

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

. ./common.rc
. ./common.filter

# real QA test starts here
_supported_fs generic
_supported_os IRIX Linux
_require_scratch
_require_xfs_io_falloc

echo "------------------------------"
echo "preallocation test"
echo "------------------------------"

rm -f $seq.full

umount $SCRATCH_DEV 2>/dev/null
_scratch_mkfs_sized $((1 * 1024 * 1024 * 1024)) >>$seq.full 2>&1
_scratch_mount

# Create a 4k file and Allocate 4M past EOF on that file
xfs_io -F -f -c "pwrite 0 4k" -c "falloc -k 4k 4m" $SCRATCH_MNT/test \
	>>$seq.full 2>&1 || _fail "failed to create test file"

# Fill the rest of the fs completely
# Note, this will show ENOSPC errors in $seq.full, that's ok.
echo "Fill fs with 1M IOs; ENOSPC expected" >> $seq.full
dd if=/dev/zero of=$SCRATCH_MNT/tmp1 bs=1M >>$seq.full 2>&1
echo "Fill fs with 4K IOs; ENOSPC expected" >> $seq.full
dd if=/dev/zero of=$SCRATCH_MNT/tmp2 bs=4K >>$seq.full 2>&1
sync
# Last effort, use O_SYNC
echo "Fill fs with 4K DIOs; ENOSPC expected" >> $seq.full
dd if=/dev/zero of=$SCRATCH_MNT/tmp3 bs=4K oflag=sync >>$seq.full 2>&1
# Save space usage info
echo "Post-fill space:" >> $seq.full
df $SCRATCH_MNT >>$seq.full 2>&1

# Now attempt a write into all of the preallocated space -
# in a very nasty way, badly fragmenting it and then filling it in.
echo "Fill in prealloc space; fragment at offsets:" >> $seq.full
for i in `seq 1 2 1023`; do
	echo -n "$i " >> $seq.full
	dd if=/dev/zero of=$SCRATCH_MNT/test seek=$i bs=4K count=1 conv=notrunc \
		>>$seq.full 2>/dev/null || _fail "failed to write to test file"
done
sync
echo >> $seq.full
echo "Fill in prealloc space; fill holes at offsets:" >> $seq.full
for i in `seq 2 2 1023`; do
	echo -n "$i " >> $seq.full
	dd if=/dev/zero of=$SCRATCH_MNT/test seek=$i bs=4K count=1 conv=notrunc \
		>>$seq.full 2>/dev/null || _fail "failed to fill test file"
done
sync
echo >> $seq.full

echo "done"
exit
