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conf: snapshot: Add support for <metadata_cache>

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Similarly to the domain config code it may be beneficial to control the
cache size of images introduced as snapshots into the backing chain.
Wire up handling of the 'metadata_cache' element.

Signed-off-by: Peter Krempa <pkrempa@redhat.com>
Reviewed-by: Ján Tomko <jtomko@redhat.com>
This commit is contained in:
Peter Krempa 2021-01-07 15:30:21 +01:00
parent 154df5840d
commit 06380cb587
6 changed files with 70 additions and 2 deletions
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4
docs/formatsnapshot.html.in
View File

@ -186,6 +186,10 @@
with an attribute <code>type</code> giving the driver type (such
as qcow2), of the new file created by the external
snapshot of the new file.
Optionally <code>metadata_cache</code> sub-element can be used
with same semantics as the identically named subelement of the
domain definition disk's driver.
</dd>
<dt><code>seclabel</code></dt>
</dl>

10
docs/schemas/domainsnapshot.rng
View File

@ -212,7 +212,15 @@
<ref name="storageFormatBacking"/>
</attribute>
</optional>
<empty/>
<optional>
<element name="metadata_cache">
<optional>
<element name="max_size">
<ref name="scaledInteger"/>
</element>
</optional>
</element>
</optional>
</element>
</optional>
</define>

23
src/conf/snapshot_conf.c
View File

@ -190,6 +190,12 @@ virDomainSnapshotDiskDefParseXML(xmlNodePtr node,
goto cleanup;
}
if (virParseScaledValue("./driver/metadata_cache/max_size", NULL,
ctxt,
&def->src->metadataCacheMaxSize,
1, ULLONG_MAX, false) < 0)
goto cleanup;
/* validate that the passed path is absolute */
if (virStorageSourceIsRelative(def->src)) {
virReportError(VIR_ERR_XML_ERROR,
@ -784,12 +790,27 @@ virDomainSnapshotDiskDefFormat(virBufferPtr buf,
virDomainSnapshotLocationTypeToString(disk->snapshot));
if (disk->src->path || disk->src->format != 0) {
g_auto(virBuffer) driverAttrBuf = VIR_BUFFER_INITIALIZER;
g_auto(virBuffer) driverChildBuf = VIR_BUFFER_INIT_CHILD(&childBuf);
virBufferAsprintf(&attrBuf, " type='%s'", virStorageTypeToString(disk->src->type));
if (disk->src->format > 0)
virBufferEscapeString(&childBuf, "<driver type='%s'/>\n",
virBufferEscapeString(&driverAttrBuf, " type='%s'",
virStorageFileFormatTypeToString(disk->src->format));
if (disk->src->metadataCacheMaxSize > 0) {
g_auto(virBuffer) metadataCacheChildBuf = VIR_BUFFER_INIT_CHILD(&driverChildBuf);
virBufferAsprintf(&metadataCacheChildBuf,
"<max_size unit='bytes'>%llu</max_size>\n",
disk->src->metadataCacheMaxSize);
virXMLFormatElement(&driverChildBuf, "metadata_cache", NULL, &metadataCacheChildBuf);
}
virXMLFormatElement(&childBuf, "driver", &driverAttrBuf, &driverChildBuf);
if (virDomainDiskSourceFormat(&childBuf, disk->src, "source", 0, false, 0,
false, false, xmlopt) < 0)
return -1;

14
tests/qemudomainsnapshotxml2xmlin/qcow2-metadata-cache.xml Normal file
View File

@ -0,0 +1,14 @@
<domainsnapshot>
<name>my snap name</name>
<description>!@#$%^</description>
<disks>
<disk name='hdd' snapshot='external'>
<source file='/path/to/new'/>
<driver type='qcow2'>
<metadata_cache>
<max_size unit='bytes'>1234</max_size>
</metadata_cache>
</driver>
</disk>
</disks>
</domainsnapshot>

18
tests/qemudomainsnapshotxml2xmlout/qcow2-metadata-cache.xml Normal file
View File

@ -0,0 +1,18 @@
<domainsnapshot>
<name>my snap name</name>
<description>!@#$%^</description>
<creationTime>1386166249</creationTime>
<disks>
<disk name='hdd' snapshot='external' type='file'>
<driver type='qcow2'>
<metadata_cache>
<max_size unit='bytes'>1234</max_size>
</metadata_cache>
</driver>
<source file='/path/to/new'/>
</disk>
</disks>
<domain>
<uuid>9d37b878-a7cc-9f9a-b78f-49b3abad25a8</uuid>
</domain>
</domainsnapshot>

3
tests/qemudomainsnapshotxml2xmltest.c
View File

@ -181,6 +181,9 @@ mymain(void)
DO_TEST_IN("description_only", NULL);
DO_TEST_IN("name_only", NULL);
DO_TEST_INOUT("qcow2-metadata-cache", "9d37b878-a7cc-9f9a-b78f-49b3abad25a8",
1386166249, 0);
qemuTestDriverFree(&driver);
return ret == 0 ? EXIT_SUCCESS : EXIT_FAILURE;