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block: rewrite bio_copy_data_iter to use bvec_kmap_local and memcpy_to_bvec
Use the proper helpers instead of open coding the copy. Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com> Link: https://lore.kernel.org/r/20210727055646.118787-11-hch@lst.de Signed-off-by: Jens Axboe <axboe@kernel.dk>
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parent
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commit
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26
block/bio.c
26
block/bio.c
@ -1186,27 +1186,15 @@ EXPORT_SYMBOL(bio_advance);
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void bio_copy_data_iter(struct bio *dst, struct bvec_iter *dst_iter,
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struct bio *src, struct bvec_iter *src_iter)
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{
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struct bio_vec src_bv, dst_bv;
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void *src_p, *dst_p;
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unsigned bytes;
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while (src_iter->bi_size && dst_iter->bi_size) {
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src_bv = bio_iter_iovec(src, *src_iter);
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dst_bv = bio_iter_iovec(dst, *dst_iter);
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struct bio_vec src_bv = bio_iter_iovec(src, *src_iter);
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struct bio_vec dst_bv = bio_iter_iovec(dst, *dst_iter);
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unsigned int bytes = min(src_bv.bv_len, dst_bv.bv_len);
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void *src_buf;
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bytes = min(src_bv.bv_len, dst_bv.bv_len);
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src_p = kmap_atomic(src_bv.bv_page);
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dst_p = kmap_atomic(dst_bv.bv_page);
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memcpy(dst_p + dst_bv.bv_offset,
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src_p + src_bv.bv_offset,
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bytes);
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kunmap_atomic(dst_p);
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kunmap_atomic(src_p);
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flush_dcache_page(dst_bv.bv_page);
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src_buf = bvec_kmap_local(&src_bv);
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memcpy_to_bvec(&dst_bv, src_buf);
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kunmap_local(src_buf);
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bio_advance_iter_single(src, src_iter, bytes);
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bio_advance_iter_single(dst, dst_iter, bytes);
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