From 3dcfbcce1b8749a6e62be11c41a797c98ecc4127 Mon Sep 17 00:00:00 2001 From: Christoph Hellwig Date: Tue, 12 Oct 2021 08:31:53 +0200 Subject: [PATCH] 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: Nikolay Borisov Signed-off-by: Christoph Hellwig Reviewed-by: David Sterba Signed-off-by: David Sterba --- fs/btrfs/file-item.c | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-) diff --git a/fs/btrfs/file-item.c b/fs/btrfs/file-item.c index ddb9c7ee796f..d1cbb64a78f3 100644 --- a/fs/btrfs/file-item.c +++ b/fs/btrfs/file-item.c @@ -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; -- GitLab