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[Qemu-devel] [RFC PATCH 0/2] Early release of -drive QemuOpts

From: Paolo Bonzini
Subject: [Qemu-devel] [RFC PATCH 0/2] Early release of -drive QemuOpts
Date: Fri, 8 Jan 2016 18:37:43 +0100

In short, this patch gets rid of blockdev_mark_auto_del and

With these patches, it is possible to create a new -drive with the same
id as soon as the DEVICE_DELETED event is delivered (which equals to

I'm sorry I'm not able to explain the history (and probably do not
understand the full ramifications) of this.  That's why this is just
an RFC.

The idea here is that reference counting the BlockBackend is enough to
defer the deletion of the block device as much as necessary; anticipating
the demise of the DriveInfo is not a problem, and has the desired effect
of freeing the QemuOpts.


Paolo Bonzini (2):
  block: detach devices from DriveInfo at unrealize time
  block: remove legacy_dinfo at blk_detach_dev time

 block/block-backend.c            | 14 ++++++++----
 blockdev.c                       | 26 ++++++++------------------
 hw/block/virtio-blk.c            |  4 +++-
 hw/block/xen_disk.c              |  1 +
 hw/core/qdev-properties-system.c |  2 +-
 hw/ide/piix.c                    |  3 +++
 hw/scsi/scsi-bus.c               |  4 +++-
 hw/usb/dev-storage.c             |  3 ++-
 include/sysemu/blockdev.h        |  5 ++---
 9 files changed, 33 insertions(+), 29 deletions(-)


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