Btrfs: Align extent length to sectorsize in

---
Signed-off-by: NChris Mason <chris.mason@oracle.com>

fs/btrfs/inode.c

@@ -823,6 +823,8 @@ static int btrfs_truncate_in_trans(struct btrfs_trans_handle *trans,
 					btrfs_file_extent_num_bytes(leaf, fi);
 				extent_num_bytes = inode->i_size -
 					found_key.offset + root->sectorsize - 1;
+				extent_num_bytes = extent_num_bytes &
+					~((u64)root->sectorsize - 1);
 				btrfs_set_file_extent_num_bytes(leaf, fi,
 							 extent_num_bytes);
 				num_dec = (orig_num_bytes -