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Re: [Qemu-devel] [PATCH] Disk image shared and exclusive locks.
From: |
Chris Webb |
Subject: |
Re: [Qemu-devel] [PATCH] Disk image shared and exclusive locks. |
Date: |
Mon, 7 Dec 2009 14:58:07 +0000 |
User-agent: |
Mutt/1.5.20 (2009-06-14) |
"Daniel P. Berrange" <address@hidden> writes:
> The only other alternative would be for the destination to open the disks,
> but not immediately acquire the locks. In the final stage of migration have
> the source release its lock & signal to the dest that it can now acquire
> the lock. The assumption being that the lock acquisition is far less likely
> to fail than the open(), so we focus on making sure we can properly handle
> open() failure.
This is what we've implemented as a prototype for sheepdog, with bdrv_claim
(happens on vm_start) and bdrv_release (happens on exit/vm_stop) hooks
available to block drivers.
Cheers,
Chris.
Re: [Qemu-devel] [PATCH] Disk image shared and exclusive locks., Daniel P. Berrange, 2009/12/07
Re: [Qemu-devel] [PATCH] Disk image shared and exclusive locks., Chris Webb, 2009/12/07
[Qemu-devel] [PATCH VERSION 2] Disk image shared and exclusive locks., Richard W.M. Jones, 2009/12/07