tests/generic/308

#! /bin/bash
# FS QA Test No. 308
#
# Regression test for commit:
# f17722f ext4: Fix max file size and logical block counting of extent format file
#
#-----------------------------------------------------------------------
# Copyright (c) 2013 Red Hat, 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
#-----------------------------------------------------------------------
#

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

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

_cleanup()
{
	cd /
	rm -f $testfile
}

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

testfile=$TEST_DIR/testfile.$seq

# real QA test starts here
_supported_fs generic
_supported_os Linux
_require_test

rm -f $seqres.full
echo "Silence is golden"

block_size=`_get_block_size $TEST_DIR`

# On unpatched ext4, if an extent exists which includes the block right
# before the maximum file offset, and the block for the maximum file offset
# is written, the kernel panics
# On patched ext4, the write would get EFBIG since we lower s_maxbytes by
# one fs block

# Create a sparse file with an extent lays at one block before old s_maxbytes
offset=$(((2**32 - 2) * $block_size))
$XFS_IO_PROG -f -c "pwrite $offset $block_size" -c fsync $testfile >$seqres.full 2>&1

# Write to the block after the extent just created
offset=$(((2**32 - 1) * $block_size))
$XFS_IO_PROG -f -c "pwrite $offset $block_size" -c fsync $testfile >>$seqres.full 2>&1

# Got here without hitting BUG_ON(), test passed
status=0
exit