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when the file's apparent size is not a multiple of its block size. * src/copy.c (copy_reg): Don't write a NUL before calling ftruncate. For some file sizes, writing that single byte would unnecessarily waste a few file blocks. That write may have been necessary in the early days of Linux, but now, removing it should be safe. Based on a patch by Alan Curry: <http://bugs.debian.org/370792> * tests/cp/sparse: New test for the above. * tests/cp/Makefile.am (TESTS): Add sparse. * tests/sparse-file: New file, essence factored out of... * tests/du/8gb: ... here. Use the new script.
34 lines
1.2 KiB
Bash
34 lines
1.2 KiB
Bash
# -*- sh -*-
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# Does the current (working-dir.) file system support sparse files?
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# Copyright (C) 2006 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 2 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, write to the Free Software
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# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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# 02110-1301, USA.
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# Test whether we can create a sparse file.
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# For example, on Darwin6.5 with a file system of type hfs, it's not possible.
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# NTFS requires 128K before a hole appears in a sparse file.
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t=sparse.$$
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dd bs=1 seek=128K of=$t < /dev/null 2> /dev/null
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set x `du -sk $t`
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kb_size=$2
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rm -f $t
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if test $kb_size -ge 128; then
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echo "$0: skipping this test, since this file system doesn't support" \
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sparse files 1>&2
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(exit 77); exit 77
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fi
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