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SubjectRe: [PATCH v4 02/28] mm: Add an unlock function for PG_private_2/PG_fscache
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Matthew Wilcox <willy@infradead.org> wrote:

> So ... a page with both flags cleared should have a refcount of N.
> A page with one or both flags set should have a refcount of N+1.
> ...
> How is a poor filesystem supposed to make that true? Also btrfs has this
> problem since it uses private_2 for its own purposes.

It's simpler if it's N+2 for both patches set. Btw, patch 13 adds that - and
possibly that should be merged into an earlier patch.

David

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