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70 lines
2.6 KiB
Bash
Executable File
70 lines
2.6 KiB
Bash
Executable File
#!/bin/sh
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# ensure that a sparse file is copied efficiently, by default
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# Copyright (C) 2021-2026 Free Software Foundation, Inc.
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <https://www.gnu.org/licenses/>.
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. "${srcdir=.}/tests/init.sh"; path_prepend_ ./src
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print_ver_ cp
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cleanup_() { rm -rf "$other_partition_tmpdir"; }
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. "$abs_srcdir/tests/other-fs-tmpdir"
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# Create a sparse file on another partition to avoid reflinking
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# thus exercising more copy logic
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other_partition_sparse=$other_partition_tmpdir/k
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printf x > $other_partition_sparse || framework_failure_
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truncate -s1M $other_partition_sparse || framework_failure_
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# cp should not disable anything by default, even for sparse files. For e.g.
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# copy offload is an important performance improvement for sparse files on NFS.
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cp --debug $other_partition_sparse k2 >cp.out || fail=1
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cmp $other_partition_sparse k2 || fail=1
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grep ': avoided' cp.out && { cat cp.out; fail=1; }
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# Create a large-non-sparse-but-compressible file
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# Ensure we don't avoid copy offload which we saw with
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# transparent compression on OpenZFS at least
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# (as that triggers our sparse heuristic).
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mls='might-look-sparse'
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yes | head -n1M > "$mls" || framework_failure_
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cp --debug "$mls" "$mls.cp" >cp.out || fail=1
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cmp "$mls" "$mls.cp" || fail=1
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grep ': avoided' cp.out && { cat cp.out; fail=1; }
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# Create a large-but-sparse file on the current partition.
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# We disable relinking below, thus verifying SEEK_HOLE support
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timeout 10 truncate -s1T f ||
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skip_ "unable to create a 1 TiB sparse file"
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# Note zfs with zfs_dmu_offset_next_sync=0 (the default)
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# will generally skip here, due to needing about 5 seconds
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# between the creation of the file and the use of SEEK_DATA,
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# for it to determine it's an empty file (return ENXIO).
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seek_data_capable_ f ||
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skip_ "insufficient SEEK_DATA support"
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# Nothing can read that many bytes in so little time.
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timeout 10 cp --reflink=never f f2 || fail=1
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# Ensure that the sparse file copied through SEEK_DATA has the same size
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# in bytes as the original.
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test "$(stat --printf %s f)" = "$(stat --printf %s f2)" || fail=1
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Exit $fail
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