6:48 a.m.
Certain disk format drivers in qemu don't allow concurrent acces at the
level of the format driver since it would corrupt the metadata. Reject
shared access for a disk if the format does not support it. Currently
only RAW format supports it since it does not have any metadata.
Resolves: https://bugzilla.redhat.com/show_bug.cgi?id=1511480
---
src/qemu/qemu_domain.c | 19 +++++++++++++++
.../qemuxml2argv-disk-drive-shared-qcow.xml | 28 ++++++++++++++++++++++
.../qemuxml2argv-disk-drive-shared.args | 2 +-
.../qemuxml2argv-disk-drive-shared.xml | 2 +-
tests/qemuxml2argvtest.c | 1 +
5 files changed, 50 insertions(+), 2 deletions(-)
create mode 100644 tests/qemuxml2argvdata/qemuxml2argv-disk-drive-shared-qcow.xml
diff --git a/src/qemu/qemu_domain.c b/src/qemu/qemu_domain.c
index 29fdb49d1..fdbe6a4e3 100644
--- a/src/qemu/qemu_domain.c
+++ b/src/qemu/qemu_domain.c
@@ -25,6 +25,7 @@
#include "qemu_domain.h"
#include "qemu_alias.h"
+#include "qemu_block.h"
#include "qemu_cgroup.h"
#include "qemu_command.h"
#include "qemu_process.h"
@@ -3724,6 +3725,21 @@ qemuDomainDeviceDefValidateVideo(const virDomainVideoDef *video)
}
+static int
+qemuDomainDeviceDefValidateDisk(const virDomainDiskDef *disk)
+{
+ if (disk->src->shared && !disk->src->readonly &&
+ !qemuBlockStorageSourceSupportsConcurrentAccess(disk->src)) {
+ virReportError(VIR_ERR_CONFIG_UNSUPPORTED,
+ _("shared access for disk '%s' requires use of
"
+ "supported storage format"), disk->dst);
+ return -1;
+ }
+
+ return 0;
+}
+
+
static int
qemuDomainDeviceDefValidate(const virDomainDeviceDef *dev,
const virDomainDef *def,
@@ -3765,6 +3781,9 @@ qemuDomainDeviceDefValidate(const virDomainDeviceDef *dev,
break;
case VIR_DOMAIN_DEVICE_DISK:
+ ret = qemuDomainDeviceDefValidateDisk(dev->data.disk);
+ break;
+
case VIR_DOMAIN_DEVICE_LEASE:
case VIR_DOMAIN_DEVICE_FS:
case VIR_DOMAIN_DEVICE_INPUT:
diff --git a/tests/qemuxml2argvdata/qemuxml2argv-disk-drive-shared-qcow.xml
b/tests/qemuxml2argvdata/qemuxml2argv-disk-drive-shared-qcow.xml
new file mode 100644
index 000000000..ca88a944b
--- /dev/null
+++ b/tests/qemuxml2argvdata/qemuxml2argv-disk-drive-shared-qcow.xml
@@ -0,0 +1,28 @@
+<domain type='qemu'>
+ <name>QEMUGuest1</name>
+ <uuid>c7a5fdbd-edaf-9455-926a-d65c16db1809</uuid>
+ <memory unit='KiB'>219136</memory>
+ <currentMemory unit='KiB'>219136</currentMemory>
+ <vcpu placement='static'>1</vcpu>
+ <os>
+ <type arch='i686' machine='pc'>hvm</type>
+ <boot dev='hd'/>
+ </os>
+ <clock offset='utc'/>
+ <on_poweroff>destroy</on_poweroff>
+ <on_reboot>restart</on_reboot>
+ <on_crash>destroy</on_crash>
+ <devices>
+ <emulator>/usr/bin/qemu-system-i686</emulator>
+ <disk type='block' device='disk'>
+ <driver name='qemu' type='qcow2'/>
+ <source dev='/dev/HostVG/QEMUGuest1'/>
+ <target dev='hda' bus='ide'/>
+ <shareable/>
+ <address type='drive' controller='0' bus='0'
target='0' unit='0'/>
+ </disk>
+ <controller type='usb' index='0'/>
+ <controller type='ide' index='0'/>
+ <memballoon model='virtio'/>
+ </devices>
+</domain>
diff --git a/tests/qemuxml2argvdata/qemuxml2argv-disk-drive-shared.args
b/tests/qemuxml2argvdata/qemuxml2argv-disk-drive-shared.args
index 502157bf8..326fde1b3 100644
--- a/tests/qemuxml2argvdata/qemuxml2argv-disk-drive-shared.args
+++ b/tests/qemuxml2argvdata/qemuxml2argv-disk-drive-shared.args
@@ -19,7 +19,7 @@ server,nowait \
-no-acpi \
-boot c \
-usb \
--drive file=/dev/HostVG/QEMUGuest1,format=qcow2,if=none,id=drive-ide0-0-0,\
+-drive file=/dev/HostVG/QEMUGuest1,format=raw,if=none,id=drive-ide0-0-0,\
serial=XYZXYZXYZYXXYZYZYXYZY,cache=none \
-device ide-drive,bus=ide.0,unit=0,drive=drive-ide0-0-0,id=ide0-0-0 \
-drive file=/dev/HostVG/QEMUGuest2,format=raw,if=none,media=cdrom,\
diff --git a/tests/qemuxml2argvdata/qemuxml2argv-disk-drive-shared.xml
b/tests/qemuxml2argvdata/qemuxml2argv-disk-drive-shared.xml
index 9f7472378..677c2b0b7 100644
--- a/tests/qemuxml2argvdata/qemuxml2argv-disk-drive-shared.xml
+++ b/tests/qemuxml2argvdata/qemuxml2argv-disk-drive-shared.xml
@@ -15,7 +15,7 @@
<devices>
<emulator>/usr/bin/qemu-system-i686</emulator>
<disk type='block' device='disk'>
- <driver name='qemu' type='qcow2'/>
+ <driver name='qemu' type='raw'/>
<source dev='/dev/HostVG/QEMUGuest1'/>
<target dev='hda' bus='ide'/>
<shareable/>
diff --git a/tests/qemuxml2argvtest.c b/tests/qemuxml2argvtest.c
index 1bedc6874..bfced6dda 100644
--- a/tests/qemuxml2argvtest.c
+++ b/tests/qemuxml2argvtest.c
@@ -908,6 +908,7 @@ mymain(void)
QEMU_CAPS_DRIVE_BOOT);
DO_TEST("disk-drive-shared",
QEMU_CAPS_DRIVE_SERIAL);
+ DO_TEST_PARSE_ERROR("disk-drive-shared-qcow", NONE);
DO_TEST("disk-drive-error-policy-stop",
QEMU_CAPS_MONITOR_JSON);
DO_TEST("disk-drive-error-policy-enospace",
--
2.14.3