virtio-blk: problem of the disk name release

[yuxh]

hi,

About the virtio-blk disk name,if the virtio-blk disk is detached when 
it has reference in guest, then the disk name will not be released 
forever. It seems the purpose of this is to avoid a disk error when we 
attach the disk back.
The problem by doing so is that the disk name can't be reused any more. 
I think if we can release the disk name dynamically when the reference 
no longer exist the problem will be solved. But it seems not easy to 
implement this.
Any body have a suggestion ?

Thanks,
Yu
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