Zach Brown f9ca1885f9 Specify ring blocks with index,nr
Specifying the ring blocks with a head and tail index lead to pretty
confusing code to figure out how many blocks to read and if we had
passed the tail.

Instead specify the ring with a starting index and number of blocks.
The code to read and write the ring blocks naturally falls out and is a
lot more clear.

Signed-off-by: Zach Brown <zab@versity.com>
2017-04-18 13:44:53 -07:00
2017-04-18 13:44:53 -07:00
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