123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596 | #!/bin/sh# Copyright (C) 2012-2025 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 <https://www.gnu.org/licenses/>. . "${srcdir=.}/tests/init.sh"; path_prepend_ ./src print_ver_ dd is_local_dir_ . || very_expensive_ require_sparse_support_ # Ensure basic sparse generation works truncate -s1M sparse dd bs=32K if=sparse of=sparse.dd conv=sparse test $(stat -c%s sparse) = $(stat -c%s sparse.dd) || fail=1# Demonstrate that conv=sparse with oflag=append,# will do ineffective seeks in the outputprintf'a\000\000b'>file.inprintf'ab'> exp ddif=file.in bs=1 conv=sparse oflag=append > out compare exp out || fail=1# Demonstrate conv=sparse with conv=notrunc,# where data in file.out is not overwritten with NULsprintf'____'> out printf'a__b'> exp ddif=file.in bs=1 conv=sparse,notrunc of=out compare exp out || fail=1# Ensure we fall back to write if seek failsddif=file.in bs=1 conv=sparse | cat>file.out cmp file.infile.out || fail=1# Setup for block size tests: create a 3MiB file with a 1MiB# stretch of NUL bytes in the middle.rm-ffile.inddif=/dev/urandom of=file.in bs=1M count=3 iflag=fullblock || fail=1ddif=/dev/zero of=file.in bs=1M count=1 seek=1 conv=notrunc || fail=1 kb_alloc() { du -k"$1"|cut -f1; }# sync out data for async allocators like NFS/BTRFS# sync file.in || fail=1# If our just-created input file appears to be too small,# skip the remaining tests. On at least Solaris 10 with NFS,# file.in is reported to occupy <= 1KiB for about 50 seconds# after its creation.# Also, ZFS allocation reports can be delayed or off (problem# observed on Ubuntu 23.10), so don’t trust this test on ZFS.iftest $(kb_alloc file.in)-gt3000&&test"$(stat -f -c %T file.in)"!= zfs then# Ensure NUL blocks smaller than the *output* block size are not made sparse.# Here, with a 2MiB block size, dd's conv=sparse must *not* introduce a hole.ddif=file.in of=file.out ibs=1M obs=2M conv=sparse || fail=1# Intermittently BTRFS returns 0 allocation for file.out unless synced sync file.out || framework_failure_ test2500-lt $(kb_alloc file.out) || fail=1# Note we recreate a sparse file first to avoid# speculative preallocation seen in XFS, where a write() that# extends a file can preallocate some extra space that# a subsequent seek will not convert to a hole.rm-ffile.out truncate --size=3M file.out # Ensure that this 1MiB *output* block of NULs *is* converted to a hole.ddif=file.in of=file.out ibs=2M obs=1M conv=sparse,notrunc iftest $(kb_alloc file.out)-ge2500;then# Double check the failure by creating a sparse file in# the traditional manner for comparison, as we're not guaranteed# that seek=1M will create a hole. apfs on darwin 19.2.0 for example# was seen to not to create holes < 16MiB.ddif=file.in of=manual.out bs=1M count=1 || fail=1ddif=file.in of=manual.out bs=1M count=1 seek=2 conv=notrunc || fail=1test $(kb_alloc file.out)-eq $(kb_alloc manual.out) || fail=1fifi Exit $fail
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