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virDomainSetBlockThreshold: Clarify values of @dev the event is fired for

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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
index.

Signed-off-by: Peter Krempa <pkrempa@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
This commit is contained in:
Peter Krempa 2020-07-15 13:06:44 +02:00
parent c414ab00e2
commit 877d705ccf
1 changed files with 4 additions and 0 deletions
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4
src/libvirt-domain.c
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@ -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 attribute 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