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d42f3a4d41
* tests/dd/sparse: Allow for greater variation in sparse-block counts. Reported by Nelson H. F. Beebe and Bruno Haible.
77 lines
2.8 KiB
Bash
Executable File
77 lines
2.8 KiB
Bash
Executable File
#!/bin/sh
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# Copyright (C) 2012 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=.}/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
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dd if=/dev/urandom of=file.in bs=1M count=1
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truncate -s+1M file.in
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dd if=/dev/urandom of=file.in bs=1M count=1 conv=notrunc oflag=append
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# Note the block allocations below are usually equal,
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# but can vary by a file system block due to alignment,
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# which was seen on XFS at least. Also on various BSDs
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# the sparse granularity was up to 8 file system blocks
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# (16KiB for the tested systems), causing this to be the
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# minimum accuracy we can support.
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alloc_equal() {
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# 8 and 512 below are related, so hardcode sector_size for now
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# : ${sector_size:=$(stat -c "%B" "$1")}
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: ${sectors_per_block:=$(expr $(stat -f -c '%S' "$1") / 512)}
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: ${min_sectors_per_sparse_block:=$(expr $sectors_per_block '*' 8)}
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alloc_diff=$(expr $(stat -c %b "$1") - $(stat -c %b "$2"))
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alloc_diff=$(echo $alloc_diff | tr -d -- -) # abs()
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test $alloc_diff -le $min_sectors_per_sparse_block
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}
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# Ensure NUL blocks smaller than the block size are not made sparse
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dd if=file.in of=file.out bs=2M conv=sparse
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test $(stat -c %s file.in) = $(stat -c %s file.out) || fail=1
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alloc_equal file.in file.out && fail=1
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# Ensure NUL blocks >= block size are made sparse
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dd if=file.in of=file.out bs=1M conv=sparse
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test $(stat -c %s file.in) = $(stat -c %s file.out) || fail=1
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alloc_equal file.in file.out || fail=1
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Exit $fail
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