* When repairing multiple chunks at once and any of its repair
failed, the whole read request and repair work will fail
* Rename read_repair3 and read_repair4 to do_repair_chunks and
do_repair chunk in machi_file_proxy
* This pull request changes return semantics of read_chunk(), that
returns any chunk included in requested range
* First and last chunk may be cut to fit the requested range
* In machi_file_proxy, unwritten_bytes are removed and replaced by
machi_csum_table
This is simply a change of read_chunk() protocol, where a response of
read_chunk() becomes list of written bytes along with checksum. All
related code including repair is changed as such. This is to pass all
tests and not actually supporting partial chunks.
I am treating the original write-once branch as a prototype
which I am now throwing away. I had too much work interleved
in there, so I felt like the best thing to do would be to cut
a new clean branch and pull the files over and start over
against a recent-ish master.
We will have to refactor the other things in FLU in a more
piecemeal fashion.
