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block: use bvec_kmap_local in t10_pi_type1_{prepare,complete} 

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: Martin K. Petersen <martin.petersen@oracle.com>
Link: https://lore.kernel.org/r/20210727055646.118787-15-hch@lst.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Christoph Hellwig 2021-07-27 07:56:45 +02:00 committed by Jens Axboe
parent 4aebe8596a
commit 8aec120a9c
1 changed files with 6 additions and 10 deletions
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16
block/t10-pi.c
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@ -147,11 +147,10 @@ static void t10_pi_type1_prepare(struct request *rq)
break;
bip_for_each_vec(iv, bip, iter) {
void *p, *pmap;
unsigned int j;
void *p;
pmap = kmap_atomic(iv.bv_page);
p = pmap + iv.bv_offset;
p = bvec_kmap_local(&iv);
for (j = 0; j < iv.bv_len; j += tuple_sz) {
struct t10_pi_tuple *pi = p;
@ -161,8 +160,7 @@ static void t10_pi_type1_prepare(struct request *rq)
ref_tag++;
p += tuple_sz;
}
kunmap_atomic(pmap);
kunmap_local(p);
}
bip->bip_flags |= BIP_MAPPED_INTEGRITY;
@ -195,11 +193,10 @@ static void t10_pi_type1_complete(struct request *rq, unsigned int nr_bytes)
struct bvec_iter iter;
bip_for_each_vec(iv, bip, iter) {
void *p, *pmap;
unsigned int j;
void *p;
pmap = kmap_atomic(iv.bv_page);
p = pmap + iv.bv_offset;
p = bvec_kmap_local(&iv);
for (j = 0; j < iv.bv_len && intervals; j += tuple_sz) {
struct t10_pi_tuple *pi = p;
@ -210,8 +207,7 @@ static void t10_pi_type1_complete(struct request *rq, unsigned int nr_bytes)
intervals--;
p += tuple_sz;
}
kunmap_atomic(pmap);
kunmap_local(p);
}
}
}