Does a framework for notification of completed deferred file systemtasks belong in VFS, or is it better to stay per-fs?

[David Nicol]

Hello

I wrote a patch for BTRFS that provides a way for user notification of
the completion of a deferred file system task, and envision rewriting
it as a general framework for notification of completion of deferred
tasks within BTRFS in general. But why stop there? Other file systems
defer things, and general hooks for notification of completion of
deferred tasks could go into VFS instead of into particular FS -- or
not.

Thoughts?
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