On 01/10/2014 01:10 PM, Johannes Weiner wrote:

The radix tree hole searching code is only used for page cache, for
example the readahead code trying to get a a picture of the area
surrounding a fault.

It sufficed to rely on the radix tree definition of holes, which is
"empty tree slot".  But this is about to change, though, as shadow
page descriptors will be stored in the page cache after the actual
pages get evicted from memory.

Move the functions over to mm/filemap.c and make them native page
cache operations, where they can later be adapted to handle the new
definition of "page cache hole".

Signed-off-by: Johannes Weiner <hannes@cmpxchg.org>

Reviewed-by: Rik van Riel <redacted>


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