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#!/bin/sh
# ensure that a sparse file is copied efficiently, by default
# Copyright (C) 2011-2012 Free Software Foundation, Inc.
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
. "${srcdir=.}/init.sh"; path_prepend_ ../src
print_ver_ cp
# Require a fiemap-enabled FS.
touch fiemap_chk
fiemap_capable_ fiemap_chk ||
skip_ "this file system lacks FIEMAP support"
# Exclude ext3 (or unknown fs types)
# as the emulated extent scanning is slow
df -t ext3 . >/dev/null &&
skip_ "ext3 has known slow FIEMAP scanning"
# Create a large-but-sparse file.
timeout 10 truncate -s1T f || framework_failure_
# Disable this test on old BTRFS (e.g. Fedora 14)
# which reports (unwritten) extents for holes.
filefrag f || skip_ 'the 'filefrag' utility is missing'
filefrag f | grep -F ': 0 extents found' > /dev/null ||
skip_ 'this file system reports extents for holes'
# Nothing can read (much less write) that many bytes in so little time.
timeout 10 cp f f2 || fail=1
# Ensure that the sparse file copied through fiemap has the same size
# in bytes as the original.
test "$(stat --printf %s f)" = "$(stat --printf %s f2)" || fail=1
Exit $fail
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