iomap SEEK_HOLE / SEEK_DATA cleanups and generalization

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To: linux-xfs@xxxxxxxxxxxxxxx
Subject: iomap SEEK_HOLE / SEEK_DATA cleanups and generalization
From: Christoph Hellwig <hch@xxxxxx>
Date: Wed, 30 May 2018 12:02:05 +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.

Follow-Ups:
- Re: iomap SEEK_HOLE / SEEK_DATA cleanups and generalization
  - From: Darrick J. Wong
- [PATCH 3/3] fs: use ->is_partially_uptodate in page_cache_seek_hole_data
  - From: Christoph Hellwig
- [PATCH 2/3] fs: remove the buffer_unwritten check in page_seek_hole_data
  - From: Christoph Hellwig
- [PATCH 1/3] fs: move page_cache_seek_hole_data to iomap.c
  - From: Christoph Hellwig

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