iomap: make buffered writes work with RWF_DONTCACHE

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Add iomap buffered write support for RWF_DONTCACHE. If RWF_DONTCACHE is
set for a write, mark the folios being written as uncached. Then
writeback completion will drop the pages. The write_iter handler simply
kicks off writeback for the pages, and writeback completion will take
care of the rest.

Signed-off-by: "Darrick J. Wong" <djwong@kernel.org>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Link: https://lore.kernel.org/r/20250204184047.356762-2-axboe@kernel.dk
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Christian Brauner <brauner@kernel.org>

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Jens Axboe 2025-02-04 11:39:59 -07:00 • committed by Christian Brauner

parent 2014c95afe

commit b2cd5ae693

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5

Documentation/filesystems/iomap/design.rst

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2

Documentation/filesystems/iomap/operations.rst

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4

fs/iomap/buffered-io.c

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1

include/linux/iomap.h

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