[libvirt] [PATCH v3] Introduce <driver> under <filesystem> to support open-by-handle.
Eric Blake
eblake at redhat.com
Wed Oct 12 18:15:17 UTC 2011
On 10/11/2011 05:35 AM, Daniel P. Berrange wrote:
> On Tue, Oct 11, 2011 at 05:00:40PM +0530, Harsh Prateek Bora wrote:
>> VirtFS allows the user to choose between path/handle based fs driver.
>> As of now, libvirt hardcode to use path based driver only. This patch provides
>> a solution to allow user to choose between path/handle based fs driver.
>>
>> Sample:
>>
>> <filesystem type='mount'>
>> <driver type='handle'/>
>> <source dir='/folder/to/share1'/>
>> <target dir='mount_tag1'/>
>> </filesystem>
>>
>> <filesystem type='mount'>
>> <driver type='path'/>
>> <source dir='/folder/to/share2'/>
>> <target dir='mount_tag2'/>
>> </filesystem>
>>
>> Signed-off-by: Harsh Prateek Bora<harsh at linux.vnet.ibm.com>
>> ---
>> docs/schemas/domaincommon.rng | 9 +++++++++
>> src/conf/domain_conf.c | 24 ++++++++++++++++
Oops - forgot to document it in docs/formatdomain.html.in.
>> src/qemu/qemu_command.c | 15 ++++++++++++++-
>> 4 files changed, 58 insertions(+), 1 deletions(-)
Oops - forgot to add a test that exposes the new XML.
>>
>> +++ b/docs/schemas/domaincommon.rng
>> @@ -1025,6 +1025,15 @@
>> </choice>
>> <optional>
>> <ref name="address"/>
>> +<element name="driver">
This must be wrapped in <optional>, to preserve backwards compatibility.
Also, you want to tie it only to type='mount', rather than
<filesystem> in general. Furthermore, I think our existing RNG for
<address> was wrong.
>>
>> + if (fsdriver) {
>> + if ((def->fsdriver = virDomainFSDriverTypeTypeFromString(fsdriver))< 0) {
Must be <= 0 so the parser rejects 'default'.
>> + virDomainReportError(VIR_ERR_INTERNAL_ERROR,
>> + _("unknown fs driver type '%s'"), fsdriver);
>> + goto error;
>> + }
>> + } else {
>> + def->fsdriver = VIR_DOMAIN_FS_DRIVER_TYPE_PATH;
This results in an output including <driver>, even if the input lacked it.
>
> ACK, addressed all my comments now
I'm pushing with this squashed in:
diff --git i/docs/formatdomain.html.in w/docs/formatdomain.html.in
index 8daffb8..c007dff 100644
--- i/docs/formatdomain.html.in
+++ w/docs/formatdomain.html.in
@@ -1156,6 +1156,7 @@
<target dir='/'/>
</filesystem>
<filesystem type='mount' accessmode='passthrough'>
+ <driver type='path'/>
<source dir='/export/to/guest'/>
<target dir='/import/from/host'/>
<readonly/>
@@ -1178,6 +1179,11 @@
OpenVZ <span class="since">(since 0.6.2)</span>
and QEMU/KVM <span class="since">(since 0.8.5)</span>.
This is the default <code>type</code> if one is not specified.
+ This mode also has an optional
+ sub-element <code>driver</code>, with an
+ attribute <code>type='path'</code>
+ or <code>type='handle'</code> <span class="since">(since
+ 0.9.7)</span>.
</dd>
<dt><code>type='template'</code></dt>
<dd>
diff --git i/docs/schemas/domaincommon.rng w/docs/schemas/domaincommon.rng
index 3937393..c75ea37 100644
--- i/docs/schemas/domaincommon.rng
+++ w/docs/schemas/domaincommon.rng
@@ -995,9 +995,12 @@
</interleave>
</group>
<group>
- <attribute name="type">
- <value>mount</value>
- </attribute>
+ <!-- type='mount' is default -->
+ <optional>
+ <attribute name="type">
+ <value>mount</value>
+ </attribute>
+ </optional>
<interleave>
<element name="source">
<attribute name="dir">
@@ -1005,6 +1008,17 @@
</attribute>
<empty/>
</element>
+ <optional>
+ <element name="driver">
+ <attribute name="type">
+ <choice>
+ <value>path</value>
+ <value>handle</value>
+ </choice>
+ </attribute>
+ <empty/>
+ </element>
+ </optional>
<ref name="filesystemtgt"/>
</interleave>
</group>
@@ -1024,16 +1038,6 @@
</group>
</choice>
<optional>
- <ref name="address"/>
- <element name="driver">
- <attribute name="type">
- <choice>
- <value>path</value>
- <value>handle</value>
- </choice>
- </attribute>
- <empty/>
- </element>
<attribute name="accessmode">
<choice>
<value>passthrough</value>
@@ -1045,12 +1049,17 @@
</element>
</define>
<define name="filesystemtgt">
- <element name="target">
- <attribute name="dir">
- <ref name="absDirPath"/>
- </attribute>
- <empty/>
- </element>
+ <interleave>
+ <optional>
+ <ref name="address"/>
+ </optional>
+ <element name="target">
+ <attribute name="dir">
+ <ref name="absDirPath"/>
+ </attribute>
+ <empty/>
+ </element>
+ </interleave>
</define>
<!--
An interface description can either be of type bridge in which case
diff --git i/src/conf/domain_conf.c w/src/conf/domain_conf.c
index 1ad3ebc..da72ebf 100644
--- i/src/conf/domain_conf.c
+++ w/src/conf/domain_conf.c
@@ -2892,13 +2892,11 @@ virDomainFSDefParseXML(xmlNodePtr node,
}
if (fsdriver) {
- if ((def->fsdriver =
virDomainFSDriverTypeTypeFromString(fsdriver)) < 0) {
+ if ((def->fsdriver =
virDomainFSDriverTypeTypeFromString(fsdriver)) <= 0) {
virDomainReportError(VIR_ERR_INTERNAL_ERROR,
_("unknown fs driver type '%s'"),
fsdriver);
goto error;
}
- } else {
- def->fsdriver = VIR_DOMAIN_FS_DRIVER_TYPE_PATH;
}
if (source == NULL) {
diff --git i/tests/qemuxml2argvdata/qemuxml2argv-fs9p.args
w/tests/qemuxml2argvdata/qemuxml2argv-fs9p.args
index 6487fec..4c498ba 100644
--- i/tests/qemuxml2argvdata/qemuxml2argv-fs9p.args
+++ w/tests/qemuxml2argvdata/qemuxml2argv-fs9p.args
@@ -3,5 +3,8 @@ pc -m 214 -smp 1 -nographic -nodefconfig -nodefaults
-monitor \
unix:/tmp/test-monitor,server,nowait -no-acpi -boot c -hda \
/dev/HostVG/QEMUGuest1 -fsdev
local,security_model=passthrough,id=fsdev-fs0,\
path=/export/to/guest -device virtio-9p-pci,id=fs0,fsdev=fsdev-fs0,\
-mount_tag=/import/from/host,bus=pci.0,addr=0x3 -usb -device
virtio-balloon-pci,\
-id=balloon0,bus=pci.0,addr=0x4
+mount_tag=/import/from/host,bus=pci.0,addr=0x3 \
+-fsdev handle,security_model=mapped,id=fsdev-fs1,\
+path=/export/to/guest2 -device virtio-9p-pci,id=fs1,fsdev=fsdev-fs1,\
+mount_tag=/import/from/host2,bus=pci.0,addr=0x4 \
+-usb -device virtio-balloon-pci,id=balloon0,bus=pci.0,addr=0x5
diff --git i/tests/qemuxml2argvdata/qemuxml2argv-fs9p.xml
w/tests/qemuxml2argvdata/qemuxml2argv-fs9p.xml
index 62b12bc..8e817e5 100644
--- i/tests/qemuxml2argvdata/qemuxml2argv-fs9p.xml
+++ w/tests/qemuxml2argvdata/qemuxml2argv-fs9p.xml
@@ -24,5 +24,10 @@
<source dir='/export/to/guest'/>
<target dir='/import/from/host'/>
</filesystem>
+ <filesystem accessmode='mapped'>
+ <driver type='handle'/>
+ <source dir='/export/to/guest2'/>
+ <target dir='/import/from/host2'/>
+ </filesystem>
</devices>
</domain>
--
Eric Blake eblake at redhat.com +1-801-349-2682
Libvirt virtualization library http://libvirt.org
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