1#!/bin/sh 2# ensure that a sparse file is copied efficiently, by default 3 4# Copyright (C) 2021-2023 Free Software Foundation, Inc. 5 6# This program is free software: you can redistribute it and/or modify 7# it under the terms of the GNU General Public License as published by 8# the Free Software Foundation, either version 3 of the License, or 9# (at your option) any later version. 10 11# This program is distributed in the hope that it will be useful, 12# but WITHOUT ANY WARRANTY; without even the implied warranty of 13# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14# GNU General Public License for more details. 15 16# You should have received a copy of the GNU General Public License 17# along with this program. If not, see <https://www.gnu.org/licenses/>. 18 19. "${srcdir=.}/tests/init.sh"; path_prepend_ ./src 20print_ver_ cp 21 22# Create a large-but-sparse file. 23timeout 10 truncate -s1T f || 24 skip_ "unable to create a 1 TiB sparse file" 25 26# Note zfs with zfs_dmu_offset_next_sync=0 (the default) 27# will generally skip here, due to needing about 5 seconds 28# between the creation of the file and the use of SEEK_DATA, 29# for it to determine it's an empty file (return ENXIO). 30seek_data_capable_ f || 31 skip_ "insufficient SEEK_DATA support" 32 33# Nothing can read that many bytes in so little time. 34timeout 10 cp --reflink=never f f2 || fail=1 35 36# Ensure that the sparse file copied through SEEK_DATA has the same size 37# in bytes as the original. 38test "$(stat --printf %s f)" = "$(stat --printf %s f2)" || fail=1 39 40Exit $fail 41