On Wed, Jul 18, 2018 at 05:22:04PM +0200, Peter Krempa wrote:
The disk backend alias was historically the alias of the -drive backing the storage. For setups with -blockdev this will become more complex as it will depend on other configs and generally will differ. --- src/qemu/qemu_domain.c | 28 ++++++++++++++++++++++++++++ src/qemu/qemu_domain.h | 6 ++++++ 2 files changed, 34 insertions(+) diff --git a/src/qemu/qemu_domain.c b/src/qemu/qemu_domain.c index c92ac8c926..f8a621a5c9 100644 --- a/src/qemu/qemu_domain.c +++ b/src/qemu/qemu_domain.c @@ -8449,6 +8449,34 @@ qemuDomainDetermineDiskChain(virQEMUDriverPtr driver, } +/** + * qemuDomainDiskGetBackendAlias: + * @disk: disk definition + * @qemuCaps: emulator capabilities + * @backendAlias: filled with the alias of the disk storage backend + * + * Returns the correct alias for the disk backend. This may be the alias of + * -drive for legacy setup or the correct node name for -blockdev setups. + *
+ * @backendAlias may be NULL on success if the backend does not exist + * (disk is empty).
I presume this will be true in the future,
Caller is responsible for freeing @backendAlias. + * + * Returns 0 on success, -1 on error with libvirt error reported. + */ +int +qemuDomainDiskGetBackendAlias(virDomainDiskDefPtr disk, + virQEMUCapsPtr qemuCaps ATTRIBUTE_UNUSED,
and the capabilities will be used.
+ char **backendAlias)
+{
+ *backendAlias = NULL;
+
+ if (!(*backendAlias = qemuAliasDiskDriveFromDisk(disk)))
+ return -1;
+
+ return 0;
+}
+
+
/**
* qemuDomainDiskChainElementRevoke:
*
Reviewed-by: Ján Tomko <jtomko@xxxxxxxxxx> Jano
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