Enable >=16TB (up to 7 exa byte) zvol creation #242
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Problem: Unable to create >=16 TB zvols.
Cause: Using 32-bit LBA you can only refer to 2^32 -1 blocks. With volblocksize=4K, it means the total capacity can't go beyond 16TB.
Fix: Support 64-bit LBA. With this change, I was able to create zvols upto 7 exa bytes in size. Beyond that size the numbers show up as negative in the disk management UI.