tree bee7e525f1145ad55b6abd02f97d10222ae90cc9
parent 13edd5e7315a26b448c5f7f33fc7721b1e0c17ef
author Kent Overstreet <kent.overstreet@gmail.com> 1477936764 -0600
committer Jens Axboe <axboe@fb.com> 1478105418 -0600

block: add bio_iov_iter_get_pages()

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>