iomap: add the new iomap_iter model

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The iomap_iter struct provides a convenient way to package up and
maintain all the arguments to the various mapping and operation
functions.  It is operated on using the iomap_iter() function that
is called in loop until the whole range has been processed.  Compared
to the existing iomap_apply() function this avoid an indirect call
for each iteration.

For now iomap_iter() calls back into the existing ->iomap_begin and
->iomap_end methods, but in the future this could be further optimized
to avoid indirect calls entirely.

Based on an earlier patch from Matthew Wilcox <willy@infradead.org>.

Signed-off-by: Christoph Hellwig <hch@lst.de>
[djwong: add to apply.c to preserve git history of iomap loop control]
Reviewed-by: Darrick J. Wong <djwong@kernel.org>
Signed-off-by: Darrick J. Wong <djwong@kernel.org>
Reviewed-by: Dave Chinner <dchinner@redhat.com>

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Christoph Hellwig 2021-08-10 18:33:07 -07:00 • committed by Darrick J. Wong

parent 740499c784

commit f4b896c213

3 changed files with 165 additions and 2 deletions

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74

fs/iomap/apply.c

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37

fs/iomap/trace.h

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56

include/linux/iomap.h

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