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block: never take page references for ITER_BVEC

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If we pass pages through an iov_iter we always already have a reference
in the caller.  Thus remove the ITER_BVEC_FLAG_NO_REF and don't take
reference to pages by default for bvec backed iov_iters.

Reviewed-by: Minwoo Im <[email protected]>
Reviewed-by: Johannes Thumshirn <[email protected]>
Signed-off-by: Christoph Hellwig <[email protected]>
Signed-off-by: Jens Axboe <[email protected]>
This commit is contained in:
Christoph Hellwig 2019-06-26 15:49:28 +02:00 • committed by Jens Axboe
commit b620743077
4 changed files with 6 additions and 37 deletions
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14
block/bio.c
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@ -836,15 +836,6 @@ int bio_add_page(struct bio *bio, struct page *page,
}
EXPORT_SYMBOL(bio_add_page);
static void bio_get_pages(struct bio *bio)
{
struct bvec_iter_all iter_all;
struct bio_vec *bvec;
bio_for_each_segment_all(bvec, bio, iter_all)
get_page(bvec->bv_page);
}
void bio_release_pages(struct bio *bio, bool mark_dirty)
{
struct bvec_iter_all iter_all;
@ -960,11 +951,8 @@ int bio_iov_iter_get_pages(struct bio *bio, struct iov_iter *iter)
ret = __bio_iov_iter_get_pages(bio, iter);
} while (!ret && iov_iter_count(iter) && !bio_full(bio));
if (iov_iter_bvec_no_ref(iter))
if (is_bvec)
bio_set_flag(bio, BIO_NO_PAGE_REF);
else if (is_bvec)
bio_get_pages(bio);
return bio->bi_vcnt ? 0 : ret;
}