Re: [patch 2/5] mm + fs: prepare for non-page entries in page cache

[Rik van Riel]

On 05/01/2012 04:24 PM, Andrew Morton wrote:

> That's a pretty significant alteration in the meaning of ->nrpages.
> Did this not have any other effects?

From what I see (though it's been a long day), ->nrpages
stays the same it is now.

The non-page entries are simply not counted in ->nrpages.

> What does truncate do?  I assume it invalidates shadow page entries in
> the radix tree?  And frees the radix-tree nodes?

Indeed, truncate will get rid of the non-page entries
in the radix tree.  That is why it needs to be called
even if ->nrpages==0.

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