Re: [libvirt] [RFC 0/5] block: File descriptor passing using -open-hook-fd
Il 01/05/2012 22:56, Eric Blake ha scritto:
What sort
of timing restrictions are there? For example, the proposed
'drive-reopen' command (probably now delegated to qemu 1.2) would mean
that qemu would be calling back into libvirt in order to do the reopen.
If libvirt takes its time in passing back an open fd, is it going to
starve qemu from answering unrelated monitor commands in the meantime?
I definitely want to make sure we avoid deadlock where libvirt is
waiting on a monitor command, but the monitor command is waiting on
libvirt to pass an fd.
FWIW I'm going to kill drive-reopen in favor of something like
block-job-complete that will not require reopening (it will require
opening the backing files though, and that can also take time).
Paolo