[PATCH 2/7] dm-integrity: replace bvec_kmap_local with kmap_local_page

[Mikulas Patocka <mpatocka@redhat.com>]

Replace bvec_kmap_local with kmap_local_page - it will be needed for the
upcoming patches that make kmap_local_page optional, depending on whether
asynchronous hash interface is used or not.

Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
---
 drivers/md/dm-integrity.c |   13 ++++++-------
 1 file changed, 6 insertions(+), 7 deletions(-)

Index: linux-2.6/drivers/md/dm-integrity.c
===================================================================
--- linux-2.6.orig/drivers/md/dm-integrity.c	2025-08-18 16:58:01.000000000 +0200
+++ linux-2.6/drivers/md/dm-integrity.c	2025-08-18 17:06:37.000000000 +0200
@@ -1838,11 +1838,11 @@ static void integrity_metadata(struct wo
 			char *mem, *checksums_ptr;
 
 again:
-			mem = bvec_kmap_local(&bv_copy);
+			mem = kmap_local_page(bv_copy.bv_page);
 			pos = 0;
 			checksums_ptr = checksums;
 			do {
-				integrity_sector_checksum(ic, sector, mem + pos, checksums_ptr);
+				integrity_sector_checksum(ic, sector, mem + bv_copy.bv_offset + pos, checksums_ptr);
 				checksums_ptr += ic->tag_size;
 				sectors_to_process -= ic->sectors_per_block;
 				pos += ic->sectors_per_block << SECTOR_SHIFT;
@@ -2506,10 +2506,10 @@ skip_spinlock:
 		unsigned pos = 0;
 		while (dio->bio_details.bi_iter.bi_size) {
 			struct bio_vec bv = bio_iter_iovec(bio, dio->bio_details.bi_iter);
-			const char *mem = bvec_kmap_local(&bv);
+			const char *mem = kmap_local_page(bv.bv_page);
 			if (ic->tag_size < ic->tuple_size)
 				memset(dio->integrity_payload + pos + ic->tag_size, 0, ic->tuple_size - ic->tuple_size);
-			integrity_sector_checksum(ic, dio->bio_details.bi_iter.bi_sector, mem, dio->integrity_payload + pos);
+			integrity_sector_checksum(ic, dio->bio_details.bi_iter.bi_sector, mem + bv.bv_offset, dio->integrity_payload + pos);
 			kunmap_local(mem);
 			pos += ic->tuple_size;
 			bio_advance_iter_single(bio, &dio->bio_details.bi_iter, ic->sectors_per_block << SECTOR_SHIFT);
@@ -2626,9 +2626,8 @@ static int dm_integrity_end_io(struct dm
 			while (dio->bio_details.bi_iter.bi_size) {
 				char digest[HASH_MAX_DIGESTSIZE];
 				struct bio_vec bv = bio_iter_iovec(bio, dio->bio_details.bi_iter);
-				char *mem = bvec_kmap_local(&bv);
-				//memset(mem, 0xff, ic->sectors_per_block << SECTOR_SHIFT);
-				integrity_sector_checksum(ic, dio->bio_details.bi_iter.bi_sector, mem, digest);
+				char *mem = kmap_local_page(bv.bv_page);
+				integrity_sector_checksum(ic, dio->bio_details.bi_iter.bi_sector, mem + bv.bv_offset, digest);
 				if (unlikely(crypto_memneq(digest, dio->integrity_payload + pos,
 						min(ic->internal_hash_digestsize, ic->tag_size)))) {
 					kunmap_local(mem);