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Re: [Qemu-devel] [PATCH] aio-posix: Fix return value of aio_poll()


From: Dietmar Maurer
Subject: Re: [Qemu-devel] [PATCH] aio-posix: Fix return value of aio_poll()
Date: Tue, 22 Jan 2013 07:02:08 +0000

> aio_poll() must return true if any work is still pending, even if it didn't 
> make
> progress, so that qemu_aio_wait() doesn't return too early.
> The possibility of returning early occasionally lead to a failed assertion in
> bdrv_drain_all(), when some in-flight request was missed and the function
> didn't really drain all requests.

I still have problem with bdrv_drain_all() and my backup block job.
If I reset/suspend/resume/ the VM during a backup job run I get:

block.c:1221: bdrv_drain_all: Assertion `((&bs->tracked_requests)->lh_first == 
((void *)0))' failed.
Aborted

I am not 100% sure, but I think a simple qemu_aio_wait() is not enough to 
ensure that
a copy-on-write action has finished.

Any idea how to solve that problem?







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