[sheepdog] About VDI locking

[Valerio Pachera]

Hi all,

I was wondering if in the road map of sheepdog there is a vdi locking
function.

I think we spoke about that in the past and I remember that the locking
mechanism would inhibit the live migration.
Live migration requires to run two qemu processes with the same options, so
also using the same vdi.

I guess locking is a complex task and it's incompatibility with live
migration makes it even more complex.

Let me know what you think if, as first step, it was possible to add

--vdi-lock=yes|no

as ./configure parameter when compiling sheep or

sheep [--vdi-lock]

as sheep daemon option.

Obviously sacrificing the live migration feature.

Could that easier the task?
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