iomap SEEK_HOLE / SEEK_DATA cleanups and generalization v2

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To: linux-xfs@xxxxxxxxxxxxxxx
Subject: iomap SEEK_HOLE / SEEK_DATA cleanups and generalization v2
From: Christoph Hellwig <hch@xxxxxx>
Date: Thu, 31 May 2018 20:07:21 +0200
Cc: Andreas Gruenbacher <agruenba@xxxxxxxxxx>, linux-fsdevel@xxxxxxxxxxxxxxx, linux-ext4@xxxxxxxxxxxxxxx

Refactor the seek pagecache helpers to work independent of buffer_heads,
and clean up a few lose bits.

This is needed for the small blocksize buffered I/O support in iomap.

Changes since v1:
 - a trivial comment update

Follow-Ups:
- [PATCH 3/3] fs: use ->is_partially_uptodate in page_cache_seek_hole_data
  - From: Christoph Hellwig
- [PATCH 1/3] fs: move page_cache_seek_hole_data to iomap.c
  - From: Christoph Hellwig
- [PATCH 2/3] fs: remove the buffer_unwritten check in page_seek_hole_data
  - From: Christoph Hellwig

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