[PATCH 05/10] virDomainSetBlockThreshold: Clarify values of @dev the event is fired for

Peter Krempa pkrempa at redhat.com
Wed Jul 15 13:10:07 UTC 2020

Top level image may get two events, one with the disk target (vda) and
one with disk target with index (vda[3]) if the top level image has an

Signed-off-by: Peter Krempa <pkrempa at redhat.com>
 src/libvirt-domain.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/libvirt-domain.c b/src/libvirt-domain.c
index ba30d18f65..6c5ff5b0db 100644
--- a/src/libvirt-domain.c
+++ b/src/libvirt-domain.c
@@ -12370,6 +12370,10 @@ int virDomainGetGuestInfo(virDomainPtr domain,
  * described by @dev is written beyond the set threshold level. The threshold
  * level is unset once the event fires. The event might not be delivered at all
  * if libvirtd was not running at the moment when the threshold was reached.
+ * Note that if the threshold level is reached for a top level image the event
+ * is emitted for @dev corresponding to the disk target, and may also be reported
+ * with @dev corresponding to the disk target with an index corresponding to the
+ * 'index' attribute of 'source' in the live VM XML if the atribute is present.
  * @dev can either be a disk target name (vda, sda) or disk target with index (
  * vda[4]). Without the index the top image in the backing chain will have the

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