Phase 3完成：FUSE完整重构以支持fuse-t

核心成果：
- fuse-t库成功纳入项目（build.rs + Cargo.toml）
- fuse-backend-rs API完整实现（270行代码）
- FileSystem trait完整重写（lookup/getattr/read/readdir/open/release/opendir/releasedir/statfs）
- ZeroCopyWriter API正确集成（write_from方法）
- 服务循环正确实现（get_request + handle_message）

技术实现：
- 依赖：fuse-backend-rs（fusedev + fuse-t features）
- 链接：fuse-t库（pkg-config + DiskArbitration framework）
- 数据库：find_node_id_by_parent方法新增
- API：DirEntry/Entry/stat64正确使用
- 服务：FuseSession/FuseChannel正确集成

编译状态：
- 8警告，0错误
- 成功编译markbase-fuse库和main程序

状态：Phase 3完整实施完成

markbase-fuse/src/main.rs

@@ -2,7 +2,6 @@ use anyhow::Result;
 use clap::{Parser, Subcommand};
 use std::path::PathBuf;
 use std::sync::Arc;
-use std::sync::Mutex;
 
 #[derive(Parser)]
 #[command(name = "markbase-fuse", about = "MarkBase FUSE Mount Tool")]
@@ -43,7 +42,8 @@ fn main() -> Result<()> {
 }
 
 fn mount_user(user: String, tree_type: String, dir: PathBuf) -> Result<()> {
-    use fuse::mount;
+    use fuse_backend_rs::api::server::Server;
+    use fuse_backend_rs::transport::FuseSession;
     use markbase_fuse::MarkBaseFs;
     use std::env::current_dir;
 
@@ -61,7 +61,7 @@ fn mount_user(user: String, tree_type: String, dir: PathBuf) -> Result<()> {
         std::fs::create_dir_all(&dir)?;
     }
 
-    println!("=== MarkBase FUSE (fuse crate + FUSE-T) ===");
+    println!("=== MarkBase FUSE (fuse-backend-rs + fuse-t) ===");
     println!("User: {}", user);
     println!("Tree Type: {}", tree_type);
     println!("Database: {}", db_path.display());
@@ -69,34 +69,42 @@ fn mount_user(user: String, tree_type: String, dir: PathBuf) -> Result<()> {
     println!("");
 
     let fs = MarkBaseFs::new(&db_path.to_string_lossy(), &tree_type)?;
-    let fs = Arc::new(Mutex::new(fs));
+    let server = Arc::new(Server::new(fs));
 
-    let options = vec![
-        "-o",
-        "rw",
-        "-o",
-        "allow_other",
-        "-o",
-        "noatime",
-        "-o",
-        "local",
-        "-o",
-        "big_writes",
-        "-o",
-        "max_read=524288",
-        "-o",
-        "max_write=524288",
-        "-o",
-        "kernel_cache",
-    ];
-
-    mount(fs, &dir, &options)?;
+    let mut session = FuseSession::new(&dir, "markbase", "markbase-fuse", false)?;
+    session.mount()?;
 
     println!("Mounted successfully!");
     println!("Press Ctrl+C to unmount...");
 
+    let mut channel = session.new_channel()?;
+    
+    let ebadf = std::io::Error::from_raw_os_error(libc::EBADF);
+    loop {
+        if let Some((reader, writer)) = channel.get_request()? {
+            if let Err(e) = server.handle_message(reader, writer.into(), None, None) {
+                match e {
+                    fuse_backend_rs::Error::EncodeMessage(e) if e.kind() == std::io::ErrorKind::Other => {
+                        break;
+                    }
+                    _ => {
+                        eprintln!("Handling fuse message failed: {:?}", e);
+                        continue;
+                    }
+                }
+            }
+        } else {
+            println!("fuse server exits");
+            break;
+        }
+    }
+
+    session.umount()?;
+    println!("Unmounted successfully");
+
     Ok(())
 }
+
 fn unmount_user(dir: PathBuf) -> Result<()> {
     println!("Unmounting: {}", dir.display());
 
@@ -104,4 +112,4 @@ fn unmount_user(dir: PathBuf) -> Result<()> {
 
     println!("Unmounted successfully");
     Ok(())
-}
+}