From 8b23ebef39aa3e2817db7d42c8143139697e0adc Mon Sep 17 00:00:00 2001

From: John Snow <jsnow@redhat.com>

Date: Mon, 6 May 2019 17:56:17 +0200

Subject: [PATCH 07/53] iotests: Add 241 to test NBD on unaligned images

RH-Author: John Snow <jsnow@redhat.com>

Message-id: <20190506175629.11079-8-jsnow@redhat.com>

Patchwork-id: 87182

O-Subject: [RHEL-7.7 qemu-kvm-rhev PATCH 07/19] iotests: Add 241 to test NBD on unaligned images

Bugzilla: 1692018

RH-Acked-by: Max Reitz <mreitz@redhat.com>

RH-Acked-by: Stefano Garzarella <sgarzare@redhat.com>

RH-Acked-by: Thomas Huth <thuth@redhat.com>

From: Eric Blake <eblake@redhat.com>

Add a test for the NBD client workaround in the previous patch.  It's

not really feasible for an iotest to assume a specific tracing engine,

so we can't really probe trace_nbd_parse_blockstatus_compliance to see

if the server was fixed vs. whether the client just worked around the

server (other than by rearranging order between code patches and this

test). But having a successful exchange sure beats the previous state

of an error message. Since format probing can change alignment, we can

use that as an easy way to test several configurations.

Not tested yet, but worth adding to this test in future patches: an

NBD server that can advertise a non-sector-aligned size (such as

nbdkit) causes qemu as the NBD client to misbehave when it rounds the

size up and accesses beyond the advertised size. Qemu as NBD server

never advertises a non-sector-aligned size (since bdrv_getlength()

currently rounds up to sector boundaries); until qemu can act as such

a server, testing that flaw will have to rely on external binaries.

Signed-off-by: Eric Blake <eblake@redhat.com>

Message-Id: <20190329042750.14704-2-eblake@redhat.com>

Tested-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>

Reviewed-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>

[eblake: add forced-512 alignment, and nbdkit reproducer comment]

(cherry picked from commit e9dce9cb6eae57834cd80324ff43069299198bab)

Signed-off-by: John Snow <jsnow@redhat.com>

Signed-off-by: Miroslav Rezanina <mrezanin@redhat.com>

---

 tests/qemu-iotests/241     | 100 +++++++++++++++++++++++++++++++++++++++++++++

 tests/qemu-iotests/241.out |  26 ++++++++++++

 tests/qemu-iotests/group   |   1 +

 3 files changed, 127 insertions(+)

 create mode 100755 tests/qemu-iotests/241

 create mode 100644 tests/qemu-iotests/241.out

diff --git a/tests/qemu-iotests/241 b/tests/qemu-iotests/241

new file mode 100755

index 0000000..4b19685

--- /dev/null

+++ b/tests/qemu-iotests/241

@@ -0,0 +1,100 @@

+#!/bin/bash

+#

+# Test qemu-nbd vs. unaligned images

+#

+# Copyright (C) 2018-2019 Red Hat, 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 2 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/>.

+#

+

+seq="$(basename $0)"

+echo "QA output created by $seq"

+

+status=1 # failure is the default!

+

+nbd_unix_socket=$TEST_DIR/test_qemu_nbd_socket

+

+_cleanup()

+{

+    _cleanup_test_img

+    nbd_server_stop

+}

+trap "_cleanup; exit \$status" 0 1 2 3 15

+

+# get standard environment, filters and checks

+. ./common.rc

+. ./common.filter

+. ./common.nbd

+

+_supported_fmt raw

+_supported_proto nbd

+_supported_os Linux

+_require_command QEMU_NBD

+

+# can't use _make_test_img, because qemu-img rounds image size up,

+# and because we want to use Unix socket rather than TCP port. Likewise,

+# we have to redirect TEST_IMG to our server.

+# This tests that we can deal with the hole at the end of an unaligned

+# raw file (either because the server doesn't advertise alignment too

+# large, or because the client ignores the server's noncompliance - even

+# though we can't actually wire iotests into checking trace messages).

+printf %01000d 0 > "$TEST_IMG_FILE"

+TEST_IMG="nbd:unix:$nbd_unix_socket"

+

+echo

+echo "=== Exporting unaligned raw image, natural alignment ==="

+echo

+

+nbd_server_start_unix_socket -f $IMGFMT "$TEST_IMG_FILE"

+

+$QEMU_NBD_PROG --list -k $nbd_unix_socket | grep '\(size\|min\)'

+$QEMU_IMG map -f raw --output=json "$TEST_IMG" | _filter_qemu_img_map

+$QEMU_IO -f raw -c map "$TEST_IMG"

+nbd_server_stop

+

+echo

+echo "=== Exporting unaligned raw image, forced server sector alignment ==="

+echo

+

+# Intentionally omit '-f' to force image probing, which in turn forces

+# sector alignment, here at the server.

+nbd_server_start_unix_socket "$TEST_IMG_FILE"

+

+$QEMU_NBD_PROG --list -k $nbd_unix_socket | grep '\(size\|min\)'

+$QEMU_IMG map -f raw --output=json "$TEST_IMG" | _filter_qemu_img_map

+$QEMU_IO -f raw -c map "$TEST_IMG"

+nbd_server_stop

+

+echo

+echo "=== Exporting unaligned raw image, forced client sector alignment ==="

+echo

+

+# Now force sector alignment at the client.

+nbd_server_start_unix_socket -f $IMGFMT "$TEST_IMG_FILE"

+

+$QEMU_NBD_PROG --list -k $nbd_unix_socket | grep '\(size\|min\)'

+$QEMU_IMG map --output=json "$TEST_IMG" | _filter_qemu_img_map

+$QEMU_IO -c map "$TEST_IMG"

+nbd_server_stop

+

+# Not tested yet: we also want to ensure that qemu as NBD client does

+# not access beyond the end of a server's advertised unaligned size:

+#  nbdkit -U - memory size=513 --run 'qemu-io -f raw -c "r 512 512" $nbd'

+# However, since qemu as server always rounds up to a sector alignment,

+# we would have to use nbdkit to provoke the current client failures.

+

+# success, all done

+echo '*** done'

+rm -f $seq.full

+status=0

diff --git a/tests/qemu-iotests/241.out b/tests/qemu-iotests/241.out

new file mode 100644

index 0000000..b76a623

--- /dev/null

+++ b/tests/qemu-iotests/241.out

@@ -0,0 +1,26 @@

+QA output created by 241

+

+=== Exporting unaligned raw image, natural alignment ===

+

+  size:  1024

+  min block: 512

+[{ "start": 0, "length": 1024, "depth": 0, "zero": false, "data": true}]

+1 KiB (0x400) bytes     allocated at offset 0 bytes (0x0)

+

+=== Exporting unaligned raw image, forced server sector alignment ===

+

+WARNING: Image format was not specified for '/home/eblake/qemu/tests/qemu-iotests/scratch/t.raw' and probing guessed raw.

+         Automatically detecting the format is dangerous for raw images, write operations on block 0 will be restricted.

+         Specify the 'raw' format explicitly to remove the restrictions.

+  size:  1024

+  min block: 512

+[{ "start": 0, "length": 1024, "depth": 0, "zero": false, "data": true}]

+1 KiB (0x400) bytes     allocated at offset 0 bytes (0x0)

+

+=== Exporting unaligned raw image, forced client sector alignment ===

+

+  size:  1024

+  min block: 512

+[{ "start": 0, "length": 1024, "depth": 0, "zero": false, "data": true}]

+1 KiB (0x400) bytes     allocated at offset 0 bytes (0x0)

+*** done

diff --git a/tests/qemu-iotests/group b/tests/qemu-iotests/group

index 7da1334..882ff66 100644

--- a/tests/qemu-iotests/group

+++ b/tests/qemu-iotests/group

@@ -229,5 +229,6 @@

 233 auto quick

 234 auto quick migration

 236 auto quick

+241 rw auto quick

 242 rw auto quick

 246 rw auto quick

-- 

1.8.3.1