Messages in this thread | | | From | "Elliott, Robert (Persistent Memory)" <> | Subject | RE: [PATCH 1/4] block: bio: introduce helpers to get the 1st and last bvec | Date | Wed, 17 Feb 2016 03:08:16 +0000 |
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> -----Original Message----- > From: linux-block-owner@vger.kernel.org [mailto:linux-block- > owner@vger.kernel.org] On Behalf Of Ming Lei > Sent: Monday, February 15, 2016 3:42 AM > Subject: Re: [PATCH 1/4] block: bio: introduce helpers to get the 1st and > last bvec ... > diff --git a/include/linux/bio.h b/include/linux/bio.h ... > static inline void bio_get_last_bvec(struct bio *bio, struct bio_vec *bv) > { > - struct bvec_iter iter; > + struct bvec_iter iter = bio->bi_iter; > + int idx; > + > + bio_advance_iter(bio, &iter, iter.bi_size); > + > + WARN_ON(!iter.bi_idx && !iter.bi_bvec_done);
If this ever did trigger, I don't think you'd want it for every bio with a problem. WARN_ONCE would be safer.
--- Robert Elliott, HPE Persistent Memory
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