tree 65f12d6da71012da6e771a0c2d6c4bb0c9df7d43
parent a5c5ea3f60c000bf18c99435439533728a5f34a2
author Stefan Hajnoczi <stefanha@redhat.com> 1372086789 +0200
committer Kevin Wolf <kwolf@redhat.com> 1372404026 +0200

notify: add NotiferWithReturn so notifier list can abort

notifier_list_notify() has no return value.  This is fine when we just
want to invoke side-effects.

Sometimes it's useful for notifiers to produce a return value.  This
allows notifiers to "veto" an operation and will be used by the block
layer before-write notifier.

Reviewed-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Kevin Wolf <kwolf@redhat.com>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>