[Writable Warm] File Pinning support in FileCache #13648
Description
Is your feature request related to a problem? Please describe
With FileCache now being used by Composite Directory in addition to Remote Snapshots we need to add additional functionalities.
One of the prominent functionalities needed is to add support for pinning a file in FileCache so that it becomes illegible for eviction and is not evicted unless unpinned.
Describe the solution you'd like
Once a file is pinned, it shouldn't be evicted from FileCache.
Will update this section with more details once have a concrete LLD for this.
Related component
Storage:Remote
Describe alternatives you've considered
No response
Additional context
No response