[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 #61 from Poornima G <pgurusid at redhat.com> ---
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.

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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