Commit 3dcfbcce authored by Christoph Hellwig's avatar Christoph Hellwig Committed by David Sterba
Browse files

btrfs: use bvec_kmap_local in btrfs_csum_one_bio 



Using local kmaps slightly reduces the chances to stray writes, and
the bvec interface cleans up the code a little bit.

Reviewed-by: default avatarNikolay Borisov <nborisov@suse.com>
Signed-off-by: default avatarChristoph Hellwig <hch@lst.de>
Reviewed-by: default avatarDavid Sterba <dsterba@suse.com>
Signed-off-by: default avatarDavid Sterba <dsterba@suse.com>
parent 11b66fa6

fs/btrfs/file-item.c

+4 −4
Original line number Diff line number Diff line
@@ -708,12 +708,12 @@ blk_status_t btrfs_csum_one_bio(struct btrfs_inode *inode, struct bio *bio, 
				index = 0;

			}



			data = kmap_atomic(bvec.bv_page);

			crypto_shash_digest(shash, data + bvec.bv_offset

					    + (i * fs_info->sectorsize),

			data = bvec_kmap_local(&bvec);

			crypto_shash_digest(shash,

					    data + (i * fs_info->sectorsize),

					    fs_info->sectorsize,

					    sums->sums + index);

			kunmap_atomic(data);

			kunmap_local(data);

			index += fs_info->csum_size;

			offset += fs_info->sectorsize;

			this_sum_bytes += fs_info->sectorsize;