[Bugs] [Bug 1211863] RFE: Support in md-cache to use upcall notifications to invalidate its cache

[bugzilla at redhat.com]

https://bugzilla.redhat.com/show_bug.cgi?id=1211863



--- Comment #73 from Poornima G <pgurusid at redhat.com> ---
(In reply to Poornima G from comment #61)
> TODOs:
> 1. Implement cache size limit for md-cache
> 2. Implement register for notification in gfapi
> 3. IPC: Implement the way md-cache can communicate the list of xattr to
> upcall.
>    - implement dht_ipc, afr_ipc, ec_ipc, shard_ipc
>    - Enhance upcall to store the xattrs list seperately for each client, and
> enable each client to register and unregister its own set of xattrs.
  4. Transaction id framework to eliminate duplicate invalidations in case of
replica and EC.
  5. Display upcall invalidations also in the profile info
  6. Add support for lower xlators to indicate md-cache to not cache 

> For better debugability
> 1. Add logging in md-cache, option to enable md-cache trace logging
> 2. Md-cache, and upcall integrate with statedump
> 3. Gfapi client perf profiling ability
> 
> Test cases for md-cache:
> 1. Add test cases for testing cache-invalidation, specific cases
> 2. Run the regression with cache inval on and large timeout

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