iomap: add an iomap-based readpage and readpages implementation

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Simply use iomap_apply to iterate over the file and a submit a bio for
each non-uptodate but mapped region and zero everything else.  Note that
as-is this can not be used for file systems with a blocksize smaller than
the page size, but that support will be added later.

Signed-off-by: Christoph Hellwig <hch@lst.de>
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 2018-06-19 15:10:57 -07:00 • committed by Darrick J. Wong

parent e184fde6f3

commit 72b4daa241

2 changed files with 216 additions and 1 deletions

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214

fs/iomap.c

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3

include/linux/iomap.h

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