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block: take destination bvec offsets into account in bio_copy_data_iter 

Appartly bcache can copy into bios that do not just contain fresh
pages but can have offsets into the bio_vecs.  Restore support for tht
in bio_copy_data_iter.

Fixes: f8b679a070 ("block: rewrite bio_copy_data_iter to use bvec_kmap_local and memcpy_to_bvec")
Signed-off-by: Christoph Hellwig <hch@lst.de>
Link: https://lore.kernel.org/r/20220524143919.1155501-1-hch@lst.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Christoph Hellwig 2022-05-24 16:39:19 +02:00 committed by Jens Axboe
parent 8a177a36da
commit 403d50341c
1 changed files with 5 additions and 3 deletions
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8
block/bio.c
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@ -1366,10 +1366,12 @@ void bio_copy_data_iter(struct bio *dst, struct bvec_iter *dst_iter,
struct bio_vec src_bv = bio_iter_iovec(src, *src_iter);
struct bio_vec dst_bv = bio_iter_iovec(dst, *dst_iter);
unsigned int bytes = min(src_bv.bv_len, dst_bv.bv_len);
void *src_buf;
void *src_buf = bvec_kmap_local(&src_bv);
void *dst_buf = bvec_kmap_local(&dst_bv);
src_buf = bvec_kmap_local(&src_bv);
memcpy_to_bvec(&dst_bv, src_buf);
memcpy(dst_buf, src_buf, bytes);
kunmap_local(dst_buf);
kunmap_local(src_buf);
bio_advance_iter_single(src, src_iter, bytes);