tests/generic/308

#! /bin/bash
# SPDX-License-Identifier: GPL-2.0
# Copyright (c) 2013 Red Hat, Inc.  All Rights Reserved.
#
# FS QA Test No. 308
#
# Regression test for commit:
# f17722f ext4: Fix max file size and logical block counting of extent format file
#
. ./common/preamble
_begin_fstest auto quick

# Override the default cleanup function.
_cleanup()
{
	cd /
	rm -f $testfile
}

# Import common functions.
. ./common/filter

testfile=$TEST_DIR/testfile.$seq

# real QA test starts here
_supported_fs generic
_require_test

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