[libvirt] [PATCH] qemu: domain: Properly lookup top of chain in qemuDomainGetStorageSourceByDevstr
When idx is 0 virStorageFileChainLookup returns the base (bottom) of the
backing chain rather than the top. This is expected by the callers of
qemuDomainGetStorageSourceByDevstr.
Add a special case for idx == 0
---
With this you are not able to specify the top image of a disk when using
virDomainSetBlockThreshold in qemu.
src/qemu/qemu_domain.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/src/qemu/qemu_domain.c b/src/qemu/qemu_domain.c
index 458bb5f9a..589eb1889 100644
--- a/src/qemu/qemu_domain.c
+++ b/src/qemu/qemu_domain.c
@@ -8605,7 +8605,10 @@ qemuDomainGetStorageSourceByDevstr(const char *devstr,
goto cleanup;
}
- src = virStorageFileChainLookup(disk->src, NULL, NULL, idx, NULL);
+ if (idx == 0)
+ src = disk->src;
+ else
+ src = virStorageFileChainLookup(disk->src, NULL, NULL, idx, NULL);
cleanup:
VIR_FREE(target);
--
2.12.1