Commits on Feb 29, 2020

1. Support time_gran and max_pages fuse options …

   This updated the supported FUSE protocol from 7.12 to 7.28.
   
   The time_gran field can be set to a multiple of one nanosecond, if the
   timestamps of files has less than nanosecond precision. This avoids
   mismatches when the kernel compares timestamps.
   
   The max_pages feature raises the maximum size of a FUSE message from 32
   to 256 pages on Linux >= 4.20. This affects both reads and writes.
   To be able to read more than 128 KB in a single ReadOp, Direct I/O must
   also be used, since the kernel otherwise splits the read into 128 KB
   chunks and requests them asynchronously (if max_readahead is at least
   128 KB, otherwise max_readahead is used, or 4 KB if it is disabled).

   

   felixbuenemann committed Feb 29, 2020
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