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block: refactor __bio_iov_bvec_add_pages 

Return early on error, and add an unlikely annotation for that case.

Reviewed-by: Ming Lei <ming.lei@redhat.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Bart Van Assche <bvanassche@acm.org>
Reviewed-by: Johannes Thumshirn <jthumshirn@suse.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Christoph Hellwig 2019-04-11 08:23:28 +02:00 committed by Jens Axboe
parent 8a96a0e408
commit a10584c3cd
1 changed files with 9 additions and 10 deletions
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19
block/bio.c
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@ -873,20 +873,19 @@ static int __bio_iov_bvec_add_pages(struct bio *bio, struct iov_iter *iter)
len = min_t(size_t, bv->bv_len - iter->iov_offset, iter->count);
size = bio_add_page(bio, bv->bv_page, len,
bv->bv_offset + iter->iov_offset);
if (size == len) {
if (!bio_flagged(bio, BIO_NO_PAGE_REF)) {
struct page *page;
int i;
if (unlikely(size != len))
return -EINVAL;
mp_bvec_for_each_page(page, bv, i)
get_page(page);
}
if (!bio_flagged(bio, BIO_NO_PAGE_REF)) {
struct page *page;
int i;
iov_iter_advance(iter, size);
return 0;
mp_bvec_for_each_page(page, bv, i)
get_page(page);
}
return -EINVAL;
iov_iter_advance(iter, size);
return 0;
}
#define PAGE_PTRS_PER_BVEC (sizeof(struct bio_vec) / sizeof(struct page *))