#! /bin/bash
# SPDX-License-Identifier: GPL-2.0
# Copyright (c) 2015 Facebook.  All Rights Reserved.
#
# FS QA Test No. 092
#
# fallocate/truncate tests with FALLOC_FL_KEEP_SIZE option.
# Verify if the disk space is released after truncating a file to i_size after
# writing to a portion of a preallocated range.
#
# This also verifies that truncat'ing up past i_size doesn't remove the
# preallocated space.
#
. ./common/preamble
_begin_fstest auto quick prealloc fiemap

status=0	# success is the default!

# Import common functions.
. ./common/filter
. ./common/punch

# real QA test starts here

# Modify as appropriate.
_supported_fs generic
_require_test
_require_xfs_io_command "falloc"
_require_xfs_io_command "fiemap"

# If the truncation sizes (5M/7M) aren't aligned with the file allocation unit
# length, then the FIEMAP output will show blocks beyond EOF.  That will cause
# trouble with the golden output, so skip this test if that will be the case.
_require_congruent_file_oplen $TEST_DIR $((5 * 1048576))
_require_congruent_file_oplen $TEST_DIR $((7 * 1048576))

# First test to make sure that truncating at i_size trims the preallocated bit
# past i_size
$XFS_IO_PROG -f -c "falloc -k 0 10M" -c "pwrite 0 5M" -c "truncate 5M"\
	$TEST_DIR/testfile.$seq | _filter_xfs_io
sync
$XFS_IO_PROG -c "fiemap -v" $TEST_DIR/testfile.$seq | _filter_fiemap

# Now verify that if we truncate up past i_size we don't trim the preallocated
# bit
$XFS_IO_PROG -c "falloc -k 5M 5M" -c "truncate 7M" $TEST_DIR/testfile.$seq
$XFS_IO_PROG -c "fiemap -v" $TEST_DIR/testfile.$seq | _filter_fiemap

# success, all done
exit