[PR1] allow parallel lookups #1866
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Description
Allow parallel lookups by
(a) passing FUSE_PARALLEL_DIROPS option which allows parallel dirops (readdir and lookup calls) from FUSE driver. In my experiments i noticed that with this flag, readdir becomes parallel for same directory and lookup becomes parallel for files under same mount. Also, the even without this option, the lookup calls are parallel on repeat lookups of same files. GCSFuse takes locks on dir inode during readdir operations hence with this option. for user only the lookups are parallelized.
(b) take readonly lock on dir inode instead of exclusive lock while doing lookup.
Link to the issue in case of a bug fix.
NA
Testing details