| From | Greg Kroah-Hartman <> | Subject | [PATCH 5.17 095/298] block: take destination bvec offsets into account in bio_copy_data_iter | Date | Mon, 13 Jun 2022 12:09:49 +0200 |
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From: Christoph Hellwig <hch@lst.de>
[ Upstream commit 403d50341cce6b5481a92eb481e6df60b1f49b55 ]
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: f8b679a070c5 ("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> Signed-off-by: Sasha Levin <sashal@kernel.org> --- block/bio.c | 8 +++++--- 1 file changed, 5 insertions(+), 3 deletions(-)
diff --git a/block/bio.c b/block/bio.c index 342b1cf5d713..738fea03edbf 100644 --- a/block/bio.c +++ b/block/bio.c @@ -1308,10 +1308,12 @@ 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); -- 2.35.1
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