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drbd: use bvec_kmap_local in drbd_csum_bio

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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/20220303111905.321089-9-hch@lst.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Christoph Hellwig 2022-03-03 14:19:03 +03:00 committed by Jens Axboe
parent 07fee7aba5
commit 472278508d
1 changed files with 3 additions and 3 deletions
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6
drivers/block/drbd/drbd_worker.c
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@ -326,9 +326,9 @@ void drbd_csum_bio(struct crypto_shash *tfm, struct bio *bio, void *digest)
bio_for_each_segment(bvec, bio, iter) {
u8 *src;
src = kmap_atomic(bvec.bv_page);
crypto_shash_update(desc, src + bvec.bv_offset, bvec.bv_len);
kunmap_atomic(src);
src = bvec_kmap_local(&bvec);
crypto_shash_update(desc, src, bvec.bv_len);
kunmap_local(src);
/* REQ_OP_WRITE_SAME has only one segment,
* checksum the payload only once. */