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7c03fe2c9f
* tests/dd/sparse.sh: When testing that a hole is created, use an existing sparse destination file, so that we're not write extending the file size, and thus avoiding speculative preallocation which can result in smaller holes than requested. Workaround suggested by Brian Foster
78 lines
2.7 KiB
Bash
Executable File
78 lines
2.7 KiB
Bash
Executable File
#!/bin/sh
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# Copyright (C) 2012-2014 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 <http://www.gnu.org/licenses/>.
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. "${srcdir=.}/tests/init.sh"; path_prepend_ ./src
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print_ver_ dd
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require_sparse_support_
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# Ensure basic sparse generation works
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truncate -s1M sparse
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dd bs=32K if=sparse of=sparse.dd conv=sparse
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test $(stat -c %s sparse) = $(stat -c %s sparse.dd) || fail=1
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# Demonstrate that conv=sparse with oflag=append,
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# will do ineffective seeks in the output
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printf 'a\000\000b' > file.in
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printf 'ab' > exp
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dd if=file.in bs=1 conv=sparse oflag=append > out
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compare exp out || fail=1
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# Demonstrate conv=sparse with conv=notrunc,
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# where data in file.out is not overwritten with NULs
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printf '____' > out
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printf 'a__b' > exp
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dd if=file.in bs=1 conv=sparse,notrunc of=out
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compare exp out || fail=1
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# Ensure we fall back to write if seek fails
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dd if=file.in bs=1 conv=sparse | cat > file.out
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cmp file.in file.out || fail=1
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# Setup for block size tests: create a 3MiB file with a 1MiB
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# stretch of NUL bytes in the middle.
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rm -f file.in
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dd if=/dev/urandom of=file.in bs=1M count=3 iflag=fullblock || fail=1
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dd if=/dev/zero of=file.in bs=1M count=1 seek=1 conv=notrunc || fail=1
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kb_alloc() { du -k "$1"|cut -f1; }
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# If our just-created input file appears to be too small,
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# skip the remaining tests. On at least Solaris 10 with NFS,
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# file.in is reported to occupy <= 1KiB for about 50 seconds
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# after its creation.
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if test $(kb_alloc file.in) -gt 3000; then
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# Ensure NUL blocks smaller than the block size are not made sparse.
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# Here, with a 2MiB block size, dd's conv=sparse must *not* introduce a hole.
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dd if=file.in of=file.out bs=2M conv=sparse
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test 2500 -lt $(kb_alloc file.out) || fail=1
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# Note we recreate a sparse file first to avoid
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# speculative preallocation seen in XFS, where a write() that
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# extends a file can preallocate some extra space that
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# a subsequent seek will not convert to a hole.
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rm -f file.out
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truncate --size=3M file.out
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# Ensure that this 1MiB string of NULs *is* converted to a hole.
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dd if=file.in of=file.out bs=1M conv=sparse,notrunc
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test $(kb_alloc file.out) -lt 2500 || fail=1
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fi
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Exit $fail
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