bcache: use kmalloc to allocate bio in bch_data_verify()

This function allocates a bio, then a collection
of pages.  It copes with failure.

It currently uses a mempool() to allocate the bio,
but alloc_page() to allocate the pages.  These fail
in different ways, so the usage is inconsistent.

Change the bio_clone() to bio_clone_kmalloc()
so that no pool is used either for the bio or the pages.

Reviewed-by: Christoph Hellwig <hch@lst.de>
Acked-by: Kent Overstreet <kent.overstreet@gmail.com>
Reviewed-by : Ming Lei <ming.lei@redhat.com>
Signed-off-by: NeilBrown <neilb@suse.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

diff --git a/drivers/md/bcache/debug.c b/drivers/md/bcache/debug.c
index 06f5505..35a5a72 100644 (file)
--- a/drivers/md/bcache/debug.c
+++ b/drivers/md/bcache/debug.c
@@ -110,7 +110,7 @@ void bch_data_verify(struct cached_dev *dc, struct bio *bio)
        struct bio_vec bv, cbv;
        struct bvec_iter iter, citer = { 0 };
 
-       check = bio_clone(bio, GFP_NOIO);
+       check = bio_clone_kmalloc(bio, GFP_NOIO);
        if (!check)
                return;
        check->bi_opf = REQ_OP_READ;