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From: Ming Lei <ming.lei@redhat.com>
To: Jens Axboe <axboe@kernel.dk>,
io-uring@vger.kernel.org,
Pavel Begunkov <asml.silence@gmail.com>
Cc: Caleb Sander Mateos <csander@purestorage.com>,
Ming Lei <ming.lei@redhat.com>
Subject: [PATCH 2/4] block: add for_each_mp_bvec()
Date: Tue, 25 Mar 2025 21:51:51 +0800
Message-ID: <20250325135155.935398-3-ming.lei@redhat.com>
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Add helper of for_each_mp_bvec() for io_uring to import fixed kernel
buffer.
Signed-off-by: Ming Lei <ming.lei@redhat.com>
---
include/linux/bvec.h | 6 ++++++
1 file changed, 6 insertions(+)
diff --git a/include/linux/bvec.h b/include/linux/bvec.h
index ba8f52d48b94..204b22a99c4b 100644
--- a/include/linux/bvec.h
+++ b/include/linux/bvec.h
@@ -184,6 +184,12 @@ static inline void bvec_iter_advance_single(const struct bio_vec *bv,
((bvl = bvec_iter_bvec((bio_vec), (iter))), 1); \
bvec_iter_advance_single((bio_vec), &(iter), (bvl).bv_len))
+#define for_each_mp_bvec(bvl, bio_vec, iter, start) \
+ for (iter = (start); \
+ (iter).bi_size && \
+ ((bvl = mp_bvec_iter_bvec((bio_vec), (iter))), 1); \
+ bvec_iter_advance_single((bio_vec), &(iter), (bvl).bv_len))
+
/* for iterating one bio from start to end */
#define BVEC_ITER_ALL_INIT (struct bvec_iter) \
{ \
--
2.47.0