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drbd: use bvec_kmap_local in recv_dless_read 

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>
Link: https://lore.kernel.org/r/20220303111905.321089-10-hch@lst.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Christoph Hellwig 2022-03-03 14:19:04 +03:00 committed by Jens Axboe
parent 472278508d
commit 3eddaa60b8
1 changed files with 2 additions and 2 deletions
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4
drivers/block/drbd/drbd_receiver.c
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@ -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;