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/memory/cached_inode.rs | 51 ++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 51 insertions(+)
 create mode 100644 src/memory/cached_inode.rs

(limited to 'src/memory/cached_inode.rs')

diff --git a/src/memory/cached_inode.rs b/src/memory/cached_inode.rs
new file mode 100644
index 0000000..b51d279
--- /dev/null
+++ b/src/memory/cached_inode.rs
@@ -0,0 +1,51 @@
+use and_then_some::BoolExt;
+use crate::AyaFS;
+use crate::disk::data_block::InodeBlock;
+use crate::disk::inode::{Inode, INODE_SIZE, InodeMode};
+
+impl AyaFS {
+    pub(crate) fn create_inode(
+        &mut self,
+        permissions: u16,
+        mode: InodeMode,
+        uid: u32,
+        gid: u32,
+        flags: u32,
+    ) -> Option<usize> {
+        self.inode_bitmap.allocate().map(|inode_index| {
+            self.get_inode_mut(inode_index).map(|inode| {
+                *inode = Inode::make_inode(
+                    permissions,
+                    mode,
+                    uid,
+                    gid,
+                    Self::time_now(),
+                    flags,
+                    0,
+                    0,
+                    0,
+                );
+            });
+            inode_index
+        })
+    }
+
+    pub(crate) fn get_inode(&mut self, inode_index: usize) -> Option<&Inode> {
+        self.inode_bitmap.query(inode_index).and_then(|| {
+            let (block_index, offset) = self.locate_inode(inode_index);
+            self.get_block::<InodeBlock>(block_index)
+                .map(|cached_block| &cached_block.block.inodes[offset / INODE_SIZE])
+        })
+    }
+
+    pub(crate) fn get_inode_mut(&mut self, inode_index: usize) -> Option<&mut Inode> {
+        self.inode_bitmap.query(inode_index).and_then(|| {
+            let (block_index, offset) = self.locate_inode(inode_index);
+            self.get_block_mut::<InodeBlock>(block_index)
+                .map(|cached_block| {
+                    cached_block.dirty = true; // 保守一些, 只要返回了 &mut Inode 这个页一定标记为脏
+                    &mut cached_block.block.inodes[offset / INODE_SIZE]
+                })
+        })
+    }
+}
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