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Re: [Qemu-devel] [PATCH V2] Add -f option to qemu-nbd
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From: |
Stefan Hajnoczi |
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Subject: |
Re: [Qemu-devel] [PATCH V2] Add -f option to qemu-nbd |
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Date: |
Thu, 17 Nov 2011 13:52:01 +0000 |
On Thu, Nov 17, 2011 at 1:41 PM, Paolo Bonzini <address@hidden> wrote:
> On 11/17/2011 12:36 PM, Chunyan Liu wrote:
>>
>> Adding lock to the nbd device before connecting disk image to that device
>> to
>> handling race conditions.
>
> This removes the possibility for other programs to lock. Have you checked
> what happens if you use the same device twice and whether you can piggyback
> on e.g. an EBUSY from the NBD_SET_SOCK ioctl?
Yes, I just sent an email showing how we can use NBD_SET_LOCK for -EBUSY.
Stefan