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authorChristoph Hellwig <hch@lst.de>2021-07-27 07:56:38 +0200
committerJens Axboe <axboe@kernel.dk>2021-08-02 21:37:27 +0200
commit18a6234ccf0661401f07b6316a25d4adbba1d4bd (patch)
tree90d358e668d19231898ba0e39112cf81d2fa6cca /drivers/md
parentrbd: use memzero_bvec (diff)
downloadlinux-18a6234ccf0661401f07b6316a25d4adbba1d4bd.tar.xz
linux-18a6234ccf0661401f07b6316a25d4adbba1d4bd.zip
dm-writecache: use bvec_kmap_local instead of bvec_kmap_irq
There is no need to disable interrupts in bio_copy_block, and the local only mappings helps to avoid any sort of problems with stray writes into the bio data. Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com> Reviewed-by: Ira Weiny <ira.weiny@intel.com> Link: https://lore.kernel.org/r/20210727055646.118787-8-hch@lst.de Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'drivers/md')
-rw-r--r--drivers/md/dm-writecache.c5
1 files changed, 2 insertions, 3 deletions
diff --git a/drivers/md/dm-writecache.c b/drivers/md/dm-writecache.c
index e21e29e81bbf..3d2cf811ec3e 100644
--- a/drivers/md/dm-writecache.c
+++ b/drivers/md/dm-writecache.c
@@ -1214,14 +1214,13 @@ static void memcpy_flushcache_optimized(void *dest, void *source, size_t size)
static void bio_copy_block(struct dm_writecache *wc, struct bio *bio, void *data)
{
void *buf;
- unsigned long flags;
unsigned size;
int rw = bio_data_dir(bio);
unsigned remaining_size = wc->block_size;
do {
struct bio_vec bv = bio_iter_iovec(bio, bio->bi_iter);
- buf = bvec_kmap_irq(&bv, &flags);
+ buf = bvec_kmap_local(&bv);
size = bv.bv_len;
if (unlikely(size > remaining_size))
size = remaining_size;
@@ -1239,7 +1238,7 @@ static void bio_copy_block(struct dm_writecache *wc, struct bio *bio, void *data
memcpy_flushcache_optimized(data, buf, size);
}
- bvec_kunmap_irq(buf, &flags);
+ kunmap_local(buf);
data = (char *)data + size;
remaining_size -= size;