#! /bin/bash
# SPDX-License-Identifier: GPL-2.0-or-later
# Copyright (c) 2021 Oracle.  All Rights Reserved.
#
# FS QA Test No. 634
#
# Make sure we can store and retrieve timestamps on the extremes of the
# date ranges supported by userspace, and the common places where overflows
# can happen.
#
# This differs from generic/402 in that we don't constrain ourselves to the
# range that the filesystem claims to support; we attempt various things that
# /userspace/ can parse, and then check that the vfs clamps and persists the
# values correctly.
#
# NOTE: Old kernels (pre 5.4) allow filesystems to truncate timestamps silently
# when writing timestamps to disk!  This test detects this silent truncation
# and fails.  If you see a failure on such a kernel, contact your distributor
# for an update.

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

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

# real QA test starts here
_supported_fs generic
_require_scratch

rm -f $seqres.full

_scratch_mkfs > $seqres.full
_scratch_mount

# Does our userspace even support large dates?
test_bigdates=1
touch -d 'May 30 01:53:03 UTC 2514' $SCRATCH_MNT 2>/dev/null || test_bigdates=0

# And can we do statx?
test_statx=1
($XFS_IO_PROG -c 'help statx' | grep -q 'Print raw statx' && \
 $XFS_IO_PROG -c 'statx -r' $SCRATCH_MNT 2>/dev/null | grep -q 'stat.mtime') || \
	test_statx=0

echo "Userspace support of large timestamps: $test_bigdates" >> $seqres.full
echo "xfs_io support of statx: $test_statx" >> $seqres.full

touchme() {
	local arg="$1"
	local name="$2"

	echo "$arg" > $SCRATCH_MNT/t_$name
	touch -d "$arg" $SCRATCH_MNT/t_$name
}

report() {
	local files=($SCRATCH_MNT/t_*)
	for file in "${files[@]}"; do
		echo "${file}: $(cat "${file}")"
		TZ=UTC stat -c '%y %Y %n' "${file}"
		test $test_statx -gt 0 && \
			$XFS_IO_PROG -c 'statx -r' "${file}" | grep 'stat.mtime'
	done
}

# -2147483648 (S32_MIN, or classic unix min)
touchme 'Dec 13 20:45:52 UTC 1901' s32_min

# 2147483647 (S32_MAX, or classic unix max)
touchme 'Jan 19 03:14:07 UTC 2038' s32_max

# 7956915742, all twos
touchme 'Feb 22 22:22:22 UTC 2222' all_twos

if [ $test_bigdates -gt 0 ]; then
	# 16299260424 (u64 nsec counter from s32_min, like xfs does)
	touchme 'Tue Jul  2 20:20:24 UTC 2486' u64ns_from_s32_min

	# 15032385535 (u34 time if you start from s32_min, like ext4 does)
	touchme 'May 10 22:38:55 UTC 2446' u34_from_s32_min

	# 17179869183 (u34 time if you start from the unix epoch)
	touchme 'May 30 01:53:03 UTC 2514' u34_max

	# Latest date we can synthesize(?)
	touchme 'Dec 31 23:59:59 UTC 2147483647' abs_max_time

	# Earliest date we can synthesize(?)
	touchme 'Jan 1 00:00:00 UTC 0' abs_min_time
fi

# Query timestamps from incore
echo before >> $seqres.full
report > $tmp.before_remount
cat $tmp.before_remount >> $seqres.full

_scratch_cycle_mount

# Query timestamps from disk
echo after >> $seqres.full
report > $tmp.after_remount
cat $tmp.after_remount >> $seqres.full

# Did they match?
cmp -s $tmp.before_remount $tmp.after_remount

# success, all done
echo Silence is golden.
status=0
exit