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xfs: add support for sub-pagesize writeback without buffer_heads

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Switch to using the iomap_page structure for checking sub-page uptodate
status and track sub-page I/O completion status, and remove large
quantities of boilerplate code working around buffer heads.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Brian Foster <bfoster@redhat.com>
Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com>
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
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Christoph Hellwig 2018-07-11 22:26:05 -07:00 • committed by Darrick J. Wong
commit 82cb14175e
5 changed files with 61 additions and 455 deletions
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