[Bugs] [Bug 1664934] glusterfs-fuse client not benefiting from page cache on read after write

[bugzilla at redhat.com]

https://bugzilla.redhat.com/show_bug.cgi?id=1664934



--- Comment #4 from Raghavendra G <rgowdapp at redhat.com> ---
>From preliminary tests I see two reasons for this:
1. inode-invalidations triggered by md-cache
2. Fuse auto invalidations

With a hacky fix removing both of the above, I can see read after write being
served from kernel page-cache. I'll update the bug with more details discussing
validity/limitations with the above two approaches later.

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