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[PATCH] xfstests: test writing to device node on an RO filesystem

To: xfs-oss <xfs@xxxxxxxxxxx>
Subject: [PATCH] xfstests: test writing to device node on an RO filesystem
From: Eric Sandeen <sandeen@xxxxxxxxxx>
Date: Thu, 14 Mar 2013 16:40:16 -0500
Delivered-to: xfs@xxxxxxxxxxx
User-agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.8; rv:17.0) Gecko/20130216 Thunderbird/17.0.3
we should be able to open device nodes for writing even
if they live on a readonly filesytem.

Signed-off-by: Eric Sandeen <sandeen@xxxxxxxxxx>
---

(I may have *cough* broken this on a backport once, hence the test)

diff --git a/315 b/315
new file mode 100755
index 0000000..8b8ecc6
--- /dev/null
+++ b/315
@@ -0,0 +1,79 @@
+#! /bin/bash
+# FS QA Test No. 315
+#
+# Test that we can write to a device node residing on a RO filesystem
+#
+#-----------------------------------------------------------------------
+# Copyright (c) 2013 Red Hat, Inc.  All Rights Reserved.
+#
+# 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.
+#
+# This program is distributed in the hope that it would 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, write the Free Software Foundation,
+# Inc.,  51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+#-----------------------------------------------------------------------
+#
+# creator
+owner=sandeen@xxxxxxxxxx       
+
+seq=`basename $0`
+echo "QA output created by $seq"
+
+here=`pwd`
+tmp=/tmp/$$
+status=1       # failure is the default!
+trap "_cleanup; exit \$status" 0 1 2 3 15
+
+_cleanup()
+{
+    cd /
+    rm -f $tmp.*
+}
+
+# get standard environment, filters and checks
+. ./common.rc
+. ./common.filter
+
+# real QA test starts here
+
+# Modify as appropriate.
+_supported_fs generic
+_supported_os Linux
+_require_scratch
+
+DEVNULL=$SCRATCH_MNT/devnull
+DEVZERO=$SCRATCH_MNT/devzero
+
+_scratch_mount
+
+rm -f $DEVNULL $DEVZERO
+
+mknod $DEVNULL c 1 3 || _fail "Could not create devnull device"
+mknod $DEVZERO c 1 5 || _fail "Could not create devzero device"
+
+_scratch_unmount || _fail "Could not unmount scratch device"
+_scratch_mount -o ro || _fail "Could not remount scratch readonly"
+
+# We should be able to read & write to/from these devices even on an RO fs
+echo "== try to create new file"
+touch $SCRATCH_MNT/this_should_fail 2>&1 | _filter_scratch
+echo "== prite to null device"
+xfs_io -c "pwrite 0 512" /dev/null | _filter_xfs_io
+echo "== pread from zero device"
+xfs_io -c "pread 0 512" /dev/zero | _filter_xfs_io
+
+echo "== truncating write to null device"
+echo foo >> $DEVNULL 2>&1 | _filter_scratch
+echo "== appending write to null device"
+echo foo >> $DEVNULL 2>&1 | _filter_scratch
+
+# success, all done
+status=0
+exit
diff --git a/315.out b/315.out
new file mode 100644
index 0000000..d07c567
--- /dev/null
+++ b/315.out
@@ -0,0 +1,11 @@
+QA output created by 315
+== try to create new file
+touch: cannot touch `SCRATCH_MNT/this_should_fail': Read-only file system
+== prite to null device
+wrote 512/512 bytes at offset 0
+XXX Bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
+== pread from zero device
+read 512/512 bytes at offset 0
+XXX Bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
+== truncating write to null device
+== appending write to null device
diff --git a/group b/group
index fcbdfb6..fd838ef 100644
--- a/group
+++ b/group
@@ -430,3 +430,4 @@ stress
 305 aio dangerous enospc rw stress
 313 auto quick
 314 auto
+315 auto rw

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