linux-ext4 - iomap SEEK_HOLE / SEEK_DATA cleanups and generalization

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Message-Id: <20180530100208.31490-1-hch@lst.de>
Date:   Wed, 30 May 2018 12:02:05 +0200
From:   Christoph Hellwig <hch@....de>
To:     linux-xfs@...r.kernel.org
Cc:     Andreas Gruenbacher <agruenba@...hat.com>,
        linux-fsdevel@...r.kernel.org, linux-ext4@...r.kernel.org
Subject: iomap SEEK_HOLE / SEEK_DATA cleanups and generalization

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.