[sheepdog] [PATCH] update CHANGELOG.md for v0.9.0

[Hitoshi Mitake]

At Fri, 24 Oct 2014 10:13:53 +0400,
Vasiliy Tolstov wrote:
> 
> 2014-10-24 6:06 GMT+04:00 Hitoshi Mitake <mitake.hitoshi at lab.ntt.co.jp>:
> > + - VDI locking: opening single VDI by multiple QEMU process is not allowed
> 
> 
> Wow, as i know - before that you have patch for qemu and sheepdog to
> avoid multiply qemu process opened single vdi.
> How this works now?

Simply by utilizing atomic multicast of cluster managers. You can
track the process from SD_OP_LOCK_VDI th elemtn of sd_ops in
sheep/ops.c.

Thanks,
Hitoshi

> 
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> Vasiliy Tolstov,
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