[dm-devel] [PATCH 1/4] dm-integrity: use bvec_kmap_local in integrity_metadata

[Christoph Hellwig]

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 at lst.de>
---
 drivers/md/dm-integrity.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/md/dm-integrity.c b/drivers/md/dm-integrity.c
index dc03b70f6e65c..77c1f645f8438 100644
--- a/drivers/md/dm-integrity.c
+++ b/drivers/md/dm-integrity.c
@@ -1765,7 +1765,7 @@ static void integrity_metadata(struct work_struct *w)
 			char *mem, *checksums_ptr;
 
 again:
-			mem = (char *)kmap_atomic(bv.bv_page) + bv.bv_offset;
+			mem = bvec_kmap_local(&bv);
 			pos = 0;
 			checksums_ptr = checksums;
 			do {
@@ -1775,7 +1775,7 @@ static void integrity_metadata(struct work_struct *w)
 				pos += ic->sectors_per_block << SECTOR_SHIFT;
 				sector += ic->sectors_per_block;
 			} while (pos < bv.bv_len && sectors_to_process && checksums != checksums_onstack);
-			kunmap_atomic(mem);
+			kunmap_local(mem);
 
 			r = dm_integrity_rw_tag(ic, checksums, &dio->metadata_block, &dio->metadata_offset,
 						checksums_ptr - checksums, dio->op == REQ_OP_READ ? TAG_CMP : TAG_WRITE);
-- 
2.30.2