From 886df6daf6bb6b922276157dba1cc099e897a9ea Mon Sep 17 00:00:00 2001
From: Chuyan Zhang <me@zcy.moe>
Date: Sat, 18 Nov 2023 02:43:01 -0800
Subject: Major refactor of file hierarchy

---
 src/utils/mod.rs | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)
 create mode 100644 src/utils/mod.rs

(limited to 'src/utils/mod.rs')

diff --git a/src/utils/mod.rs b/src/utils/mod.rs
new file mode 100644
index 0000000..2ea25e7
--- /dev/null
+++ b/src/utils/mod.rs
@@ -0,0 +1,20 @@
+use crate::disk::inode::INODE_SIZE;
+use crate::{AyaFS, INODE_PER_BLOCK};
+use std::time::{SystemTime, UNIX_EPOCH};
+
+impl AyaFS {
+    pub(crate) fn time_now() -> u32 {
+        SystemTime::now()
+            .duration_since(UNIX_EPOCH)
+            .expect("How can current time be earlier than UNIX_EPOCH?")
+            .as_secs() as u32
+    }
+
+    /// 输入 inode 编号, 返回它对应的 block number 和 block 内 offset
+    pub(crate) fn locate_inode(&self, inode_index: usize) -> (usize, usize) {
+        let block_number =
+            inode_index / INODE_PER_BLOCK + 1 + self.inode_bitmap.length + self.data_bitmap.length;
+        let block_offset = inode_index % INODE_PER_BLOCK * INODE_SIZE;
+        (block_number, block_offset)
+    }
+}
-- 
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