David Chinner wrote:
quoted text
> Allow lazy unmapping of vmap()d regions be taking a reference
> on each page in the region being vmap()ed. The page references
> get released after the region is vunmap()ed, thereby ensuring
> we don't leave stray mappings on freed pages that could lead to
> problems pages being reallocated with incorrect mappings
> associated with them.
>
> Tested with XFS filesystems with 64k directory blocks with
> dirstress and XFSQA.
>
> Version 2:
>   - drop the release function stuff and just call put_page()
>     as it falls down to the same code in all calling cases.
>   

This doesn't apply cleanly to the current git tree.

    J

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