On Wed, Apr 13, 2016 at 05:09:49PM +0800, Fam Zheng wrote:
> Underneath is the fcntl syscall that locks the local file, similar to what is
> already used in libvirt virtlockd.  Also because of that, we cannot directly
> apply fcntl lock on the image file itself, instead we open and lock
> "/var/tmp/.qemu-$sha1.lock", where $sha1 is derived

Any particular reason why not /tmp instead of /var/tmp?  I assume
these are zero-sized or otherwise small files.

Rich.

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