From c12d205dae09da9623c6a4c35a9b17088a9b9a71 Mon Sep 17 00:00:00 2001
From: Christoph Hellwig <hch@lst.de>
Date: Tue, 19 Oct 2021 15:44:03 +0200
Subject: [PATCH] dm integrity: use bvec_kmap_local in integrity_metadata
Git-commit: c12d205dae09da9623c6a4c35a9b17088a9b9a71
Patch-mainline: v5.16-rc1
References: jsc#PED-2765
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>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Signed-off-by: Coly Li <colyli@suse.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 dd78baf4c7af..d8180d2a4284 100644
--- a/drivers/md/dm-integrity.c
+++ b/drivers/md/dm-integrity.c
@@ -1770,7 +1770,7 @@ 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 {
@@ -1780,7 +1780,7 @@ 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);
--
2.35.3