dm verity: use bvec_kmap_local in verity_for_bv_block

Using local kmaps slightly reduces the chances to stray writes, and
the bvec interface cleans up the code a little bit.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>

diff --git a/drivers/md/dm-verity-target.c b/drivers/md/dm-verity-target.c
index 88288c8..c6e52fd 100644 (file)
--- a/drivers/md/dm-verity-target.c
+++ b/drivers/md/dm-verity-target.c
@@ -427,14 +427,14 @@ int verity_for_bv_block(struct dm_verity *v, struct dm_verity_io *io,
                unsigned len;
                struct bio_vec bv = bio_iter_iovec(bio, *iter);
 
-               page = kmap_atomic(bv.bv_page);
+               page = bvec_kmap_local(&bv);
                len = bv.bv_len;
 
                if (likely(len >= todo))
                        len = todo;
 
-               r = process(v, io, page + bv.bv_offset, len);
-               kunmap_atomic(page);
+               r = process(v, io, page, len);
+               kunmap_local(page);
 
                if (r < 0)
                        return r;