[Bugs] [Bug 1802451] Optimize posix code to improve file creation

[bugzilla at redhat.com]

https://bugzilla.redhat.com/show_bug.cgi?id=1802451



--- Comment #1 from Mohit Agrawal <moagrawa at redhat.com> ---
Solution: To improve the same we followed two ways 
1) Keep open fd specific to first level directory(gfid[0]) in .glusterfs, it
would force to kernel keep the inodes from all those files in the cache. In
case of memory pressure kernel won't uncached first level inodes. We need to
open 256 fd's per brick to access the entry faster.
2) Use at based call's(like fstatat, lstatat, readlinkat) access relative path
to reduce path based lookup time.

After applying the patch https://review.gluster.org/#/c/glusterfs/+/23783/
performance is improved in 
total operation.

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