Re: [Xen-devel] earlier remove the backend of tapdisk device in xenstore to release the resource allocated in backend driver lies in dom0'kernel

["James (song wei)" <jsong@xxxxxxxxxx>]

Jan Beulich wrote:
> 
> 
> 
> 
>> More generally any solution should be generic, or it should be
>> explained properly why the device class needs treatment
>> different from any of the other ones (and, for this specific
>> case, why moving the device destruction a little ahead will
>> now *guarantee* that the cleanup can happen as expected).
> 
> 
> Moving the device destruction a little ahead of  killing qemu-dm would
> triger blktapctl thread send CTRMSG_CLOSE to "qemu-dm" before it exit. 
> And then, qemu-dm would notify backend driver to release resouce by
> calling release() of driver through closing the opened device file of
> "/dev/xen/blktapN" 
> 
> thanks Jim and Jan,
> 
> -James 
> 
> 
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> 
> 

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