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: NChristoph Hellwig <hch@lst.de> Acked-by: NKent Overstreet <kent.overstreet@gmail.com> Reviewed-by : Ming Lei <ming.lei@redhat.com> Signed-off-by: NNeilBrown <neilb@suse.com> Signed-off-by: NJens Axboe <axboe@kernel.dk>
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