iov_iter: optimise bvec iov_iter_advance()
iov_iter_advance() is heavily used, but implemented through generic means. For bvecs there is a specifically crafted function for that, so use bvec_iter_advance() instead, it's faster and slimmer. Reviewed-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Pavel Begunkov <asml.silence@gmail.com> Reviewed-by: Ming Lei <ming.lei@redhat.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
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@ -1065,6 +1065,21 @@ static void pipe_advance(struct iov_iter *i, size_t size)
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pipe_truncate(i);
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}
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static void iov_iter_bvec_advance(struct iov_iter *i, size_t size)
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{
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struct bvec_iter bi;
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bi.bi_size = i->count;
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bi.bi_bvec_done = i->iov_offset;
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bi.bi_idx = 0;
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bvec_iter_advance(i->bvec, &bi, size);
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i->bvec += bi.bi_idx;
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i->nr_segs -= bi.bi_idx;
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i->count = bi.bi_size;
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i->iov_offset = bi.bi_bvec_done;
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}
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void iov_iter_advance(struct iov_iter *i, size_t size)
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{
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if (unlikely(iov_iter_is_pipe(i))) {
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@ -1075,6 +1090,10 @@ void iov_iter_advance(struct iov_iter *i, size_t size)
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i->count -= size;
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return;
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}
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if (iov_iter_is_bvec(i)) {
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iov_iter_bvec_advance(i, size);
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return;
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}
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iterate_and_advance(i, size, v, 0, 0, 0)
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}
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EXPORT_SYMBOL(iov_iter_advance);
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