From: Christoph Hellwig <hch@lst.de>
Date: Tue, 19 Oct 2021 13:44:06 +0000 (+0200)
Subject: dm verity: use bvec_kmap_local in verity_for_bv_block
X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=30495e688d9dc757bae4cfc7dc3e15a79b48917f;p=linux.git

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 88288c8d6bc8c..c6e52fde24d37 100644
--- 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;