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Re: [Qemu-devel] [PATCH v2] qcow2: Unlock during COW

From: Marc-André Lureau
Subject: Re: [Qemu-devel] [PATCH v2] qcow2: Unlock during COW
Date: Sat, 5 May 2012 02:21:44 +0200


On Mon, Nov 14, 2011 at 6:55 PM, Kevin Wolf <address@hidden> wrote:
> Unlocking during COW allows for more parallelism. One change it requires is
> that buffers are dynamically allocated instead of just using a per-image
> buffer.

This commit introduces failure with preallocation and some sizes:

qemu-img create -f qcow2 new.img 976563K -o preallocation=metadata
qemu-img: qemu-coroutine-lock.c:111: qemu_co_mutex_unlock: Assertion
`mutex->locked == 1' failed.


Marc-André Lureau

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