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btrfs: integrity-checker: use kmap_local_page in __btrfsic_submit_bio 

Again there is an array of pointers which must be unmapped in the correct
order.

Convert the kmap()'s to kmap_local_page() and adjust the unmapping
to work backwards through the unmapping loop.

Signed-off-by: Ira Weiny <ira.weiny@intel.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Ira Weiny 2021-02-16 18:48:25 -08:00 committed by David Sterba
parent 94a0b58d2d
commit 3e037efdbd
1 changed files with 5 additions and 4 deletions
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9
fs/btrfs/check-integrity.c
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@ -2677,7 +2677,7 @@ static void __btrfsic_submit_bio(struct bio *bio)
dev_state = btrfsic_dev_state_lookup(bio->bi_bdev->bd_dev);
if (NULL != dev_state &&
(bio_op(bio) == REQ_OP_WRITE) && bio_has_data(bio)) {
unsigned int i = 0;
int i = 0;
u64 dev_bytenr;
u64 cur_bytenr;
struct bio_vec bvec;
@ -2702,7 +2702,7 @@ static void __btrfsic_submit_bio(struct bio *bio)
bio_for_each_segment(bvec, bio, iter) {
BUG_ON(bvec.bv_len != PAGE_SIZE);
mapped_datav[i] = kmap(bvec.bv_page);
mapped_datav[i] = kmap_local_page(bvec.bv_page);
i++;
if (dev_state->state->print_mask &
@ -2715,8 +2715,9 @@ static void __btrfsic_submit_bio(struct bio *bio)
mapped_datav, segs,
bio, &bio_is_patched,
bio->bi_opf);
bio_for_each_segment(bvec, bio, iter)
kunmap(bvec.bv_page);
/* Unmap in reverse order */
for (--i; i >= 0; i--)
kunmap_local(mapped_datav[i]);
kfree(mapped_datav);
} else if (NULL != dev_state && (bio->bi_opf & REQ_PREFLUSH)) {
if (dev_state->state->print_mask &