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