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block: change how we get page references in bio_iov_iter_get_pages

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Instead of needing a special macro to iterate over all pages in
a bvec just do a second passs over the whole bio.  This also matches
what we do on the release side.  The release side helper is moved
up to where we need the get helper to clearly express the symmetry.

Reviewed-by: Ming Lei <ming.lei@redhat.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Christoph Hellwig 2019-04-11 08:23:30 +02:00 • committed by Jens Axboe
parent 14eacf12db
commit 7321ecbfc7
2 changed files with 25 additions and 31 deletions
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5
include/linux/bvec.h
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@ -189,9 +189,4 @@ static inline void mp_bvec_last_segment(const struct bio_vec *bvec,
}
}
#define mp_bvec_for_each_page(pg, bv, i) \
for (i = (bv)->bv_offset / PAGE_SIZE; \
(i <= (((bv)->bv_offset + (bv)->bv_len - 1) / PAGE_SIZE)) && \
(pg = bvec_nth_page((bv)->bv_page, i)); i += 1)
#endif /* __LINUX_BVEC_ITER_H */