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authorPádraig Brady <P@draigBrady.com>2011-02-22 21:14:00 +0000
committerPádraig Brady <P@draigBrady.com>2011-03-05 02:33:53 +0000
commit5f3115535b32a9c0cc5aee5cf5b4001f684ad56e (patch)
tree601be66ec898ecbd0276d7258191c5468c775a6b /tests
parent433a7c614f0fbce3ba3346409af847d82670d284 (diff)
downloadcoreutils-5f3115535b32a9c0cc5aee5cf5b4001f684ad56e.tar.xz
dd: add a flag to discard cached data
* src/dd.c (FFS_MASK): A new macro (Find First Set) refactored from the following enum as it's now used twice. (usage): Mention the new 'nocache' flag. (cache_round): A new function to help ignore requests to drop cache, that are less than page_size. (invalidate_cache): A new function to call posix_fadvise() with the appropriate offset and length. Note we don't use fdadvise() so we can detect errors when count=0. (dd_copy): Call invalidate_cache() for the portions read. (iwrite): Likewise for the portions written. (main): Call invalidate_cache for page_size slop or for full file when count=0. * cfg.mk (sc_dd_O_FLAGS): Adjust to pass. * doc/coreutils.texi (dd invocation): Describe the 'nocache' flag, and give some examples of how it can be used. * tests/dd/nocache: A new test. * tests/Makefile.am: Reference the new test. * NEWS: Mention the new feature.
Diffstat (limited to 'tests')
-rw-r--r--tests/Makefile.am1
-rwxr-xr-xtests/dd/nocache58
2 files changed, 59 insertions, 0 deletions
diff --git a/tests/Makefile.am b/tests/Makefile.am
index 28eafe8ae..99b46e8e8 100644
--- a/tests/Makefile.am
+++ b/tests/Makefile.am
@@ -352,6 +352,7 @@ TESTS = \
df/unreadable \
dd/direct \
dd/misc \
+ dd/nocache \
dd/not-rewound \
dd/reblock \
dd/skip-seek \
diff --git a/tests/dd/nocache b/tests/dd/nocache
new file mode 100755
index 000000000..b0d4cc107
--- /dev/null
+++ b/tests/dd/nocache
@@ -0,0 +1,58 @@
+#!/bin/sh
+# Ensure dd handles the 'nocache' flag
+
+# Copyright (C) 2011 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/>.
+
+. "${srcdir=.}/init.sh"; path_prepend_ ../src
+print_ver_ dd
+
+# This should not call posix_fadvise
+dd iflag=nocache oflag=nocache if=/dev/null of=/dev/null || fail=1
+
+# We should get an error for trying to process a pipe
+dd iflag=nocache count=0 && fail=1
+
+# O_DIRECT is orthogonal to drop cache so mutually exclusive
+dd iflag=nocache,direct if=/dev/null && fail=1
+
+# The rest ensure that the documented uses cases
+# proceed without error
+for f in ifile ofile; do
+ dd if=/dev/zero of=$f conv=fdatasync count=100 || framework_failure
+done
+
+# Advise to drop cache for whole file
+if ! dd if=ifile iflag=nocache count=0 2>err; then
+ if grep -F 'Operation not supported' err >/dev/null; then
+ warn_ 'skipping part; this file system lacks support for posix_fadvise()'
+ skip=1
+ else
+ fail=1
+ fi
+fi
+
+if test "$skip" != 1; then
+ # Ensure drop cache for whole file
+ dd of=ofile oflag=nocache conv=notrunc,fdatasync count=0 || fail=1
+
+ # Drop cache for part of file
+ dd if=ifile iflag=nocache skip=10 count=10 of=/dev/null || fail=1
+
+ # Stream data just using readahead cache
+ dd if=ifile of=ofile iflag=nocache oflag=nocache || fail=1
+fi
+
+Exit $fail