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authorJim Meyering <meyering@redhat.com>2009-08-04 19:54:58 +0200
committerJim Meyering <meyering@redhat.com>2009-08-06 09:41:50 +0200
commit5929322ccb1f9d27c1b07b746d37419d17a7cbf6 (patch)
tree685ca3efe05ce619b33392ea499ad87c1c7a620c /tests/dd/direct
parent365fb90eaae52c92d6af8e87769e72b872492f4a (diff)
downloadcoreutils-5929322ccb1f9d27c1b07b746d37419d17a7cbf6.tar.xz
dd: work around buffer length restrictions with oflag=direct (O_DIRECT)
dd oflag=direct would fail to copy a file with size that is not a multiple of 512 (destination file system specific) * NEWS (Bug fixes): Mention it. * src/dd.c (iwrite): Turn off O_DIRECT for any smaller-than-obs-sized write. Don't bother to restore it. * tests/dd/direct: New test for the above. * tests/Makefile.am (TESTS): Add dd/direct. * doc/coreutils.texi (dd invocation): Mention oflag=direct buffer size restriction. Details in http://thread.gmane.org/gmane.comp.gnu.coreutils.bugs/17586 Reported by Eric Sandeen.
Diffstat (limited to 'tests/dd/direct')
-rwxr-xr-xtests/dd/direct40
1 files changed, 40 insertions, 0 deletions
diff --git a/tests/dd/direct b/tests/dd/direct
new file mode 100755
index 000000000..7e80bee15
--- /dev/null
+++ b/tests/dd/direct
@@ -0,0 +1,40 @@
+#!/bin/sh
+# ensure that dd's oflag=direct works
+
+# Copyright (C) 2009 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/>.
+
+if test "$VERBOSE" = yes; then
+ set -x
+ dd --version
+fi
+
+. $srcdir/test-lib.sh
+
+truncate -s 8192 in || framework_failure
+dd if=in oflag=direct of=out 2> /dev/null \
+ || skip_test_ 'this file system lacks support for O_DIRECT'
+
+truncate -s 511 short || framework_failure
+truncate -s 8191 m1 || framework_failure
+truncate -s 8193 p1 || framework_failure
+
+fail=0
+for i in short m1 p1; do
+ rm -f out
+ dd if=$i oflag=direct of=out || fail=1
+done
+
+Exit $fail