block: add bio_iov_iter_get_pages()

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This is a helper that pins down a range from an iov_iter and adds it to
a bio without requiring a separate memory allocation for the page array.
It will be used for upcoming direct I/O implementations for block devices
and iomap based file systems.

Signed-off-by: Kent Overstreet <kent.overstreet@gmail.com>
[hch: ported to the iov_iter interface, renamed and added comments.
      All blame should be directed to me and all fame should go to Kent
      after this!]
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <axboe@fb.com>

(cherry picked from commit 9cd56d916aa481ce8f56d9c5302a6ed90c2e0b5f)

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Kent Overstreet 2016-10-31 11:59:24 -06:00 • committed by Dave Chinner

parent e3df41f978

commit 3816199506

2 changed files with 50 additions and 0 deletions

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49

block/bio.c

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1

include/linux/bio.h

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