Re: [Qemu-devel] Open by references and close on exit

[Max Reitz <mreitz@redhat.com>]

Hi Benoît,

Hm, opening a reference should only result in the refcount of the 
respective BDS being incremented through bdrv_ref(). Since no new BDS is 
created, nothing should be added to bdrv_states. When the BDS “closed” 
through bdrv_unref(), it is only actually closed/deleted if the refcount 
reaches zero. Until then, it remains in bdrv_states so it can be 
referenced (since it has not been closed) and closed through 
bdrv_close_all().

I don't really see how bdrv_close_all() closes the BDS “a second time” – 
bdrv_unref() should only close the BDS if its refcount reaches zero. And 
if that's the case, it should be removed from bdrv_states anyway.


Kind regards,

Max