Re: [libvirt] [PATCH v3 15/18] blockcopy: add a way to parse disk source

The new blockcopy API wants to reuse only a subset of the disk hotplug parser - namely, we only care about the embedded virStorageSourcePtr inside a <disk> XML. Strange as it may seem, it was easier to just parse an entire disk definition, then throw away everything but the embedded source, than it was to disentangle the source parsing code from the rest of the overall disk parsing function. All that I needed was a couple of tweaks and a new internal flag that determines whether the normally-mandatory target element can be gracefully skipped, since everything else was already optional. * src/conf/domain_conf.h (virDomainDiskSourceParse): New prototype. * src/conf/domain_conf.c (VIR_DOMAIN_XML_INTERNAL_DISK_SOURCE): New flag. (virDomainDiskDefParseXML): Honor flag to make target optional. (virDomainDiskSourceParse): New function. Signed-off-by: Eric Blake <eblake(a)redhat.com&gt; --- src/conf/domain_conf.c | 107 ++++++++++++++++++++++++++++++++++------------- src/conf/domain_conf.h | 4 ++ src/libvirt_private.syms | 1 + 3 files changed, 82 insertions(+), 30 deletions(-) diff --git a/src/conf/domain_conf.c b/src/conf/domain_conf.c index 53ef694..8723008 100644 --- a/src/conf/domain_conf.c +++ b/src/conf/domain_conf.c

@@ -5951,7 +5955,7 @@ virDomainDiskDefParseXML(virDomainXMLOptionPtr xmlopt, } else { if (def->device == VIR_DOMAIN_DISK_DEVICE_FLOPPY) { def->bus = VIR_DOMAIN_DISK_BUS_FDC; - } else { + } else if (!(flags & VIR_DOMAIN_XML_INTERNAL_DISK_SOURCE)) { if (STRPREFIX(target, "hd")) def->bus = VIR_DOMAIN_DISK_BUS_IDE; else if (STRPREFIX(target, "sd")) @@ -6186,12 +6190,14 @@ virDomainDiskDefParseXML(virDomainXMLOptionPtr xmlopt, } } - if (def->info.type == VIR_DOMAIN_DEVICE_ADDRESS_TYPE_NONE - && virDomainDiskDefAssignAddress(xmlopt, def) < 0) - goto error; + if (!(flags & VIR_DOMAIN_XML_INTERNAL_DISK_SOURCE)) { + if (def->info.type == VIR_DOMAIN_DEVICE_ADDRESS_TYPE_NONE + && virDomainDiskDefAssignAddress(xmlopt, def) < 0) + goto error; - if (virDomainDiskBackingStoreParse(ctxt, def->src) < 0) - goto error; + if (virDomainDiskBackingStoreParse(ctxt, def->src) < 0) + goto error;

+ } cleanup: VIR_FREE(bus);