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authorChristoph Hellwig <hch@lst.de>2021-10-20 22:38:11 +0800
committerJens Axboe <axboe@kernel.dk>2021-10-20 08:40:54 -0600
commit00387bd21dac98f9e793294c895768d9e5441f82 (patch)
tree302be87bd06e928194b3c98607fe15ccfdac7f2f /drivers/md
parent0f5cd7815f7f4bb1dd340a9aeb9b9d6a7c7eec22 (diff)
downloadlinux-00387bd21dac98f9e793294c895768d9e5441f82.tar.bz2
bcache: use bvec_kmap_local in bch_data_verify
Using local kmaps slightly reduces the chances to stray writes, and the bvec interface cleans up the code a little bit. Also switch from page_address to bvec_kmap_local for cbv to be on the safe side and to avoid pointlessly poking into bvec internals. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Coly Li <colyli@suse.de> Link: https://lore.kernel.org/r/20211020143812.6403-8-colyli@suse.de Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'drivers/md')
-rw-r--r--drivers/md/bcache/debug.c11
1 files changed, 5 insertions, 6 deletions
diff --git a/drivers/md/bcache/debug.c b/drivers/md/bcache/debug.c
index e803cad864be..6230dfdd9286 100644
--- a/drivers/md/bcache/debug.c
+++ b/drivers/md/bcache/debug.c
@@ -127,21 +127,20 @@ void bch_data_verify(struct cached_dev *dc, struct bio *bio)
citer.bi_size = UINT_MAX;
bio_for_each_segment(bv, bio, iter) {
- void *p1 = kmap_atomic(bv.bv_page);
+ void *p1 = bvec_kmap_local(&bv);
void *p2;
cbv = bio_iter_iovec(check, citer);
- p2 = page_address(cbv.bv_page);
+ p2 = bvec_kmap_local(&cbv);
- cache_set_err_on(memcmp(p1 + bv.bv_offset,
- p2 + bv.bv_offset,
- bv.bv_len),
+ cache_set_err_on(memcmp(p1, p2, bv.bv_len),
dc->disk.c,
"verify failed at dev %pg sector %llu",
dc->bdev,
(uint64_t) bio->bi_iter.bi_sector);
- kunmap_atomic(p1);
+ kunmap_local(p2);
+ kunmap_local(p1);
bio_advance_iter(check, &citer, bv.bv_len);
}