check size of items

btrfs_explorer_bin/src/main.rs

@@ -1,7 +1,7 @@
 use std::{
 	collections::HashMap, env, fs::{File, OpenOptions}, iter,
 };
-use memmap2::{Mmap, MmapOptions};
+use memmap2::MmapOptions;
 use rouille::{Request, Response, router};
 use btrfs_explorer::{
 	btrfs_structs::{TreeID, Value::Extent, Value::BlockGroup, NODE_SIZE, ItemType},
@@ -20,7 +20,6 @@ fn main() -> Result<(), MainError> {
 	let image = unsafe { Mmap::map(&file)? };
 	*/
 
-	const O_DIRECT: i32 = 0x4000;
 	let file = OpenOptions::new().read(true).open(filename)?;
 	let image = unsafe { MmapOptions::new().len(493921239040usize).map(&file)? };