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| author | Kent Overstreet <kent.overstreet@gmail.com> | 2016-10-31 18:59:24 +0100 |
|---|---|---|
| committer | Dave Chinner <david@fromorbit.com> | 2016-11-30 03:02:03 +0100 |
| commit | 3816199506c7826983096fc65ed46f2733a47bb8 (patch) | |
| tree | b87375602661083358eaf2fa9fcb3a9ae8c653bc /include | |
| parent | Merge branch 'xfs-4.10-misc-fixes-2' into iomap-4.10-directio (diff) | |
| download | linux-3816199506c7826983096fc65ed46f2733a47bb8.tar.xz linux-3816199506c7826983096fc65ed46f2733a47bb8.zip | |
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>
(cherry picked from commit 9cd56d916aa481ce8f56d9c5302a6ed90c2e0b5f)
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/bio.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/include/linux/bio.h b/include/linux/bio.h index 97cb48f03dc7..66228c28c621 100644 --- a/include/linux/bio.h +++ b/include/linux/bio.h @@ -430,6 +430,7 @@ void bio_chain(struct bio *, struct bio *); extern int bio_add_page(struct bio *, struct page *, unsigned int,unsigned int); extern int bio_add_pc_page(struct request_queue *, struct bio *, struct page *, unsigned int, unsigned int); +int bio_iov_iter_get_pages(struct bio *bio, struct iov_iter *iter); struct rq_map_data; extern struct bio *bio_map_user_iov(struct request_queue *, const struct iov_iter *, gfp_t); |