block: don't run get_page() on pages from non-bvec iov iter

The refcount has been increased for pages retrieved from non-bvec iov iter
via __bio_iov_iter_get_pages(), so don't need to do that again.

Otherwise, IO pages are leaked easily.

Cc: Christoph Hellwig <hch@lst.de>
Reviewed-by: Chaitanya Kulkarni <chaitanya.kulkarni@wdc.com>
Fixes: 7321ecbfc7cf ("block: change how we get page references in bio_iov_iter_get_pages")
Signed-off-by: Ming Lei <ming.lei@redhat.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

diff --git a/block/bio.c b/block/bio.c
index c81ed2d..662d457 100644 (file)
--- a/block/bio.c
+++ b/block/bio.c
@@ -992,7 +992,7 @@ int bio_iov_iter_get_pages(struct bio *bio, struct iov_iter *iter)
 
        if (iov_iter_bvec_no_ref(iter))
                bio_set_flag(bio, BIO_NO_PAGE_REF);
-       else
+       else if (is_bvec)
                bio_get_pages(bio);
 
        return bio->bi_vcnt ? 0 : ret;