zfs code - May 2008 - Using O_EXCL flag on /dev/zvol nodes

The /dev/[r]dsk nodes implement the O_EXCL flag. If a node is opened using the
O_EXCL, subsequent open(2) to that node fail. But I dont think the same is true
for /dev/zvol/[r]dsk nodes. Is that a bug (or maybe RFE) ?

Thanks
Sumit
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