dm integrity: use bvec_kmap_local in __journal_read_write

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>

diff --git a/drivers/md/dm-integrity.c b/drivers/md/dm-integrity.c
index d8180d2..0af091b 100644 (file)
--- a/drivers/md/dm-integrity.c
+++ b/drivers/md/dm-integrity.c
@@ -1963,7 +1963,7 @@ static bool __journal_read_write(struct dm_integrity_io *dio, struct bio *bio,
                n_sectors -= bv.bv_len >> SECTOR_SHIFT;
                bio_advance_iter(bio, &bio->bi_iter, bv.bv_len);
 retry_kmap:
-               mem = kmap_atomic(bv.bv_page);
+               mem = bvec_kmap_local(&bv);
                if (likely(dio->op == REQ_OP_WRITE))
                        flush_dcache_page(bv.bv_page);
 
@@ -1977,7 +1977,7 @@ retry_kmap:
 
                                if (unlikely(journal_entry_is_inprogress(je))) {
                                        flush_dcache_page(bv.bv_page);
-                                       kunmap_atomic(mem);
+                                       kunmap_local(mem);
 
                                        __io_wait_event(ic->copy_to_journal_wait, !journal_entry_is_inprogress(je));
                                        goto retry_kmap;
@@ -2070,7 +2070,7 @@ retry_kmap:
 
                if (unlikely(dio->op == REQ_OP_READ))
                        flush_dcache_page(bv.bv_page);
-               kunmap_atomic(mem);
+               kunmap_local(mem);
        } while (n_sectors);
 
        if (likely(dio->op == REQ_OP_WRITE)) {