flexfiles: make rsize/wsize configurable
Motivation: The read/write buffer size between a and the data server is offered by MDS. Currently, this value is hard coded to 64k, which is not optimal value for modern hardware. Modification: Allow mds to specify preferred IO size for DS. Though this value can be different for each data server, we use a single buffer size by assuming that in typical installation data servers have a similar IO capabilities. As Linux client uses single value for rsize and wsize, we use (for pragmatic reasons) a single value as well. Result: The IO size between clients and the server can be configured. Acked-by: Paul Millar Target: master
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