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b85eb8d683
* doc/coreutils.texi (shred invocation): Mention some reasons why clearing slack space might be useful. * src/shred.c (do_wipefd): Add initial writes for each pass for small regular files in case the storage for those is in the inode, and thus a larger write up to a block size would bypass that. Move the direct I/O control to... (dopass): ... here so we can avoid enabling it for these small initial writes. It's better to retry direct I/O for each pass anyway to handle the case where direct I/O is disabled for only the last portion of a file when the size is not a multiple of the block size. Note we don't avoid the sync for the initial write as it will be small but more importantly could be on a different part of the disk and so worth doing independently to ensure the write is not discarded. * tests/misc/shred-exact.sh: Check some more direct I/O cases. * NEWS: Mention the improvements. The inode storage issue was mentioned by Paul Eggert.
50 lines
1.6 KiB
Bash
Executable File
50 lines
1.6 KiB
Bash
Executable File
#!/bin/sh
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# Test functionality of --exact
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# Copyright (C) 2000-2014 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_ shred
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# make sure that neither --exact nor --zero gobbles a command line argument
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for opt in --exact --zero; do
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echo a > a || fail=1
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echo bb > b || fail=1
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echo ccc > c || fail=1
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shred --remove $opt a b || fail=1
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test -f a && fail=1
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test -f b && fail=1
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shred --remove $opt c || fail=1
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test -f c && fail=1
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done
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# make sure direct I/O is handled appropriately at end of file
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# Create a 1MiB file as we'll probably not be using blocks larger than that
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# (i.e. we want to test failed writes not at the start).
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truncate -s1MiB file.slop || framework_failure_
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truncate -s+1 file.slop || framework_failure_
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shred --exact -n2 file.slop || fail=1
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# make sure direct I/O is handled appropriately at start of file
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truncate -s1 file.slop || framework_failure_
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shred --exact -n2 file.slop || fail=1
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Exit $fail
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