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bcache: use bvec_kmap_local in bio_csum

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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/20220303111905.321089-8-hch@lst.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Christoph Hellwig 2022-03-03 14:19:02 +03:00 committed by Jens Axboe
parent 3205190655
commit 07fee7aba5
1 changed files with 2 additions and 2 deletions
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4
drivers/md/bcache/request.c
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@ -44,10 +44,10 @@ static void bio_csum(struct bio *bio, struct bkey *k)
uint64_t csum = 0;
bio_for_each_segment(bv, bio, iter) {
void *d = kmap(bv.bv_page) + bv.bv_offset;
void *d = bvec_kmap_local(&bv);
csum = crc64_be(csum, d, bv.bv_len);
kunmap(bv.bv_page);
kunmap_local(d);
}
k->ptr[KEY_PTRS(k)] = csum & (~0ULL >> 1);