Re: [Qemu-devel] [PATCH 0/3] block: fix and detect qemu_aio_wait() issues

[Kevin Wolf <kwolf@redhat.com>]

Am 30.11.2011 13:23, schrieb Stefan Hajnoczi:
> This series fixes an issue where qemu_aio_flush() would return to IDE hardware
> emulation with requests still pending.  Kevin Wolf <kwolf@redhat.com> found it
> in the block tree before qemu.git/master merge, so qemu.git/master is not
> affected and these patches are against his tree.
> 
> A recent interaction between copy-on-read and "qcow2: Unlock during COW"
> emphasized the need for strong assertion checking.  Patch 1 fixes an assertion
> failure with qcow2 images in hw/ide/pci.c:bmdma_cmd_writeb().
> 
> Patches 2 and 3 then introduce assertions that detect
> wait_for_overlapping_requests() deadlock and broken qemu_aio_wait().  In the
> future we will have better information if issues related to qemu_aio_wait()
> come up.
> 
> I have run qemu-iotests for qcow2 and qed.  I have also performed a RHEL6 guest
> install to qed and tested booting the guest with IDE and qcow2.
> 
> Stefan Hajnoczi (3):
>   qcow2: avoid reentrant bdrv_read() in copy_sectors()
>   block: wait_for_overlapping_requests() deadlock detection
>   block: convert qemu_aio_flush() calls to bdrv_drain_all()

Thanks, applied all to the block branch.

Kevin