From: Christoph Hellwig <hch@lst.de>
Date: Tue, 19 Oct 2021 13:44:05 +0000 (+0200)
Subject: dm log writes: use memcpy_from_bvec in log_writes_map
X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=27db2717085198862a5b96dc8f00e527bf45c950;p=linux.git

dm log writes: use memcpy_from_bvec in log_writes_map

Use memcpy_from_bvec instead of open coding the logic.

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

diff --git a/drivers/md/dm-log-writes.c b/drivers/md/dm-log-writes.c
index d93a4db235124..eeaf729287f06 100644
--- a/drivers/md/dm-log-writes.c
+++ b/drivers/md/dm-log-writes.c
@@ -753,7 +753,7 @@ static int log_writes_map(struct dm_target *ti, struct bio *bio)
 	 */
 	bio_for_each_segment(bv, bio, iter) {
 		struct page *page;
-		void *src, *dst;
+		void *dst;
 
 		page = alloc_page(GFP_NOIO);
 		if (!page) {
@@ -765,11 +765,9 @@ static int log_writes_map(struct dm_target *ti, struct bio *bio)
 			return DM_MAPIO_KILL;
 		}
 
-		src = kmap_atomic(bv.bv_page);
 		dst = kmap_atomic(page);
-		memcpy(dst, src + bv.bv_offset, bv.bv_len);
+		memcpy_from_bvec(dst, &bv);
 		kunmap_atomic(dst);
-		kunmap_atomic(src);
 		block->vecs[i].bv_page = page;
 		block->vecs[i].bv_len = bv.bv_len;
 		block->vec_cnt++;