mirror of
git://git.sv.gnu.org/coreutils.git
synced 2026-04-20 18:56:39 +02:00
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
|
|
# Test functionality of --exact
|
|
|
|
# Copyright (C) 2000-2014 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 <http://www.gnu.org/licenses/>.
|
|
|
|
. "${srcdir=.}/tests/init.sh"; path_prepend_ ./src
|
|
print_ver_ shred
|
|
|
|
|
|
# make sure that neither --exact nor --zero gobbles a command line argument
|
|
for opt in --exact --zero; do
|
|
echo a > a || fail=1
|
|
echo bb > b || fail=1
|
|
echo ccc > c || fail=1
|
|
|
|
shred --remove $opt a b || fail=1
|
|
test -f a && fail=1
|
|
test -f b && fail=1
|
|
|
|
shred --remove $opt c || fail=1
|
|
test -f c && fail=1
|
|
done
|
|
|
|
|
|
# make sure direct I/O is handled appropriately at end of file
|
|
# Create a 1MiB file as we'll probably not be using blocks larger than that
|
|
# (i.e. we want to test failed writes not at the start).
|
|
truncate -s1MiB file.slop || framework_failure_
|
|
truncate -s+1 file.slop || framework_failure_
|
|
shred --exact -n2 file.slop || fail=1
|
|
|
|
# make sure direct I/O is handled appropriately at start of file
|
|
truncate -s1 file.slop || framework_failure_
|
|
shred --exact -n2 file.slop || fail=1
|
|
|
|
Exit $fail
|