Re: [RFC][PATCH 2/7] UBC: core (structures, API)

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+struct user_beancounter
+{
+	atomic_t		ub_refcount;


Why not use a struct kref here instead of rolling your own reference
counting logic?

We need more complex decrement/locking scheme than krefs
provide. e.g. in __put_beancounter() we need
atomic_dec_and_lock_irqsave() semantics for performance optimizations.

Kirill

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