tests/generic/204

#! /bin/bash
# FS QA Test No. 204
#
# Test out ENOSPC flushing on small filesystems.
#
#-----------------------------------------------------------------------
# Copyright (c) 2009 Christoph Hellwig.
#
# 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()
{
	rm -f $tmp.*
}

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

# real QA test starts here
_supported_fs generic
_supported_os Linux

_require_scratch

rm -f $seqres.full

# get the block size first
_scratch_mkfs 2> /dev/null | _filter_mkfs 2> $tmp.mkfs > /dev/null
. $tmp.mkfs

# For xfs, we need to handle the different default log sizes that different
# versions of mkfs create. All should be valid with a 16MB log, so use that.
# And v4/512 v5/1k xfs don't have enough free inodes, set imaxpct=50 at mkfs
# time solves this problem.
[ $FSTYP = "xfs" ] && MKFS_OPTIONS="$MKFS_OPTIONS -l size=16m -i maxpct=50"

SIZE=`expr 115 \* 1024 \* 1024`
_scratch_mkfs_sized $SIZE $dbsize 2> /dev/null > $tmp.mkfs.raw
cat $tmp.mkfs.raw | _filter_mkfs 2> $tmp.mkfs > /dev/null
_scratch_mount

# Source $tmp.mkfs to get geometry
. $tmp.mkfs

# fix the reserve block pool to a known size so that the enospc calculations
# work out correctly. Space usages is based 22500 files and 1024 reserved blocks
# on a 4k block size 256 byte inode size filesystem.
resv_blks=1024
space=$(stat -f -c '%f * %S' $SCRATCH_MNT | $BC_PROG)

# decrease files for inode size.
#	22500 * (256 + 4k) = ~97MB
#	files * (isize + bsize) = 97MB
#	files = (97920000 / (isize + bsize))

files=$((space / (isize + dbsize)))

# Now do it again, but factor in the filename sizes too.
# We naively assume 8 bytes for inode number, 1 byte for ftype,
# and 1 more byte for namelen, then round up to the nearest 8
# bytes.

namelen="$(echo -n "$files" | wc -c)"
direntlen="$(echo "(10 + $namelen + 7) / 8 * 8" | $BC_PROG)"

files=$((space / (direntlen + isize + dbsize)))

echo files $files, resvblks $resv_blks >> $seqres.full
_scratch_resvblks $resv_blks >> $seqres.full 2>&1

for i in `seq -w 1 $files`; do
    echo -n > $SCRATCH_MNT/$i
    echo XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX > $SCRATCH_MNT/$i
done

# success, all done
echo "*** done"
status=0