[PATCH 09/10] drbd: use bvec_kmap_local in recv_dless_read

Christoph Hellwig
2022-03-03T11:20:21Z

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>
Reviewed-by: Ira Weiny <ira.weiny@intel.com>
---
drivers/block/drbd/drbd_receiver.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/block/drbd/drbd_receiver.c b/drivers/block/drbd/drbd_receiver.c
index 04e3ec12d8b49..fa00cf2ea9529 100644
--- a/drivers/block/drbd/drbd_receiver.c
+++ b/drivers/block/drbd/drbd_receiver.c
@@ -2017,10 +2017,10 @@ static int recv_dless_read(struct drbd_peer_device *peer_device, struct drbd_req
D_ASSERT(peer_device->device, sector == bio->bi_iter.bi_sector);

bio_for_each_segment(bvec, bio, iter) {
- void *mapped = kmap(bvec.bv_page) + bvec.bv_offset;
+ void *mapped = bvec_kmap_local(&bvec);
expect = min_t(int, data_size, bvec.bv_len);
err = drbd_recv_all_warn(peer_device->connection, mapped, expect);
- kunmap(bvec.bv_page);
+ kunmap_local(mapped);
if (err)
return err;
data_size -= expect;
--
2.30.2