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-rw-r--r--fs/btrfs/file-item.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/fs/btrfs/file-item.c b/fs/btrfs/file-item.c
index 0782e924dde..fb8c214160c 100644
--- a/fs/btrfs/file-item.c
+++ b/fs/btrfs/file-item.c
@@ -239,7 +239,8 @@ int btrfs_csum_truncate(struct btrfs_trans_handle *trans,
if (isize <= key.offset)
return 0;
new_item_span = isize - key.offset;
- blocks = (new_item_span + root->blocksize - 1) / root->blocksize;
+ blocks = (new_item_span + root->blocksize - 1) >>
+ root->fs_info->sb->s_blocksize_bits;
new_item_size = blocks * BTRFS_CRC32_SIZE;
if (new_item_size >= btrfs_item_size(leaf->items + slot))
return 0;