[PATCH 3/4] fs/btrfs: Use kmap_local_page() in __btrfsic_submit_bio()

[ira . weiny]

From: Ira Weiny <ira.weiny@xxxxxxxxx>

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@xxxxxxxxx>
---
 fs/btrfs/check-integrity.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/fs/btrfs/check-integrity.c b/fs/btrfs/check-integrity.c
index 6ff44e53814c..726eb894be8b 100644
--- a/fs/btrfs/check-integrity.c
+++ b/fs/btrfs/check-integrity.c
@@ -2677,7 +2677,7 @@ static void __btrfsic_submit_bio(struct bio *bio)
 	dev_state = btrfsic_dev_state_lookup(bio_dev(bio) + bio->bi_partno);
 	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 +2715,8 @@ 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);
+		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 &
-- 
2.28.0.rc0.12.gb6a658bd00c9