diff --git a/kernel/Cargo.lock b/kernel/Cargo.lock
index 5fa45bd..d02cb3a 100644
--- a/kernel/Cargo.lock
+++ b/kernel/Cargo.lock
@@ -338,12 +338,12 @@ dependencies = [
 [[package]]
 name = "rcore-fs"
 version = "0.1.0"
-source = "git+https://github.com/rcore-os/rcore-fs?branch=sefs#c9322710b4ba67c086f500befb8208c6ae353493"
+source = "git+https://github.com/rcore-os/rcore-fs?branch=sefs#166616e5ade1a5c929f705fd1564ef0ea337ba72"
 
 [[package]]
 name = "rcore-fs-sfs"
 version = "0.1.0"
-source = "git+https://github.com/rcore-os/rcore-fs?branch=sefs#c9322710b4ba67c086f500befb8208c6ae353493"
+source = "git+https://github.com/rcore-os/rcore-fs?branch=sefs#166616e5ade1a5c929f705fd1564ef0ea337ba72"
 dependencies = [
  "bitvec 0.9.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "log 0.4.6 (registry+https://github.com/rust-lang/crates.io-index)",
diff --git a/kernel/src/fs/pipe.rs b/kernel/src/fs/pipe.rs
index 9521904..4f35fc3 100644
--- a/kernel/src/fs/pipe.rs
+++ b/kernel/src/fs/pipe.rs
@@ -69,6 +69,7 @@ macro_rules! impl_inode {
         fn get_entry(&self, _id: usize) -> Result<String> { Err(FsError::NotDir) }
         fn fs(&self) -> Arc<FileSystem> { unimplemented!() }
         fn as_any_ref(&self) -> &Any { self }
+        fn chmod(&self, _mode: u16) -> Result<()> { Ok(()) }
     };
 }
 
diff --git a/kernel/src/fs/stdio.rs b/kernel/src/fs/stdio.rs
index 4987fe6..562e783 100644
--- a/kernel/src/fs/stdio.rs
+++ b/kernel/src/fs/stdio.rs
@@ -64,6 +64,7 @@ macro_rules! impl_inode {
         fn get_entry(&self, _id: usize) -> Result<String> { Err(FsError::NotDir) }
         fn fs(&self) -> Arc<FileSystem> { unimplemented!() }
         fn as_any_ref(&self) -> &Any { self }
+        fn chmod(&self, _mode: u16) -> Result<()> { Ok(()) }
     };
 }
 
diff --git a/kernel/src/syscall/fs.rs b/kernel/src/syscall/fs.rs
index 03f2569..2a97b4c 100644
--- a/kernel/src/syscall/fs.rs
+++ b/kernel/src/syscall/fs.rs
@@ -725,19 +725,9 @@ impl Process {
             }
         })
     }
-    fn lookup_inode(&self, path: &str) -> Result<Arc<INode>, SysError> {
+    pub fn lookup_inode(&self, path: &str) -> Result<Arc<INode>, SysError> {
         debug!("lookup_inode: cwd {} path {}", self.cwd, path);
-        if path.len() > 0 && path.as_bytes()[0] == b'/' {
-            // absolute path
-            let abs_path = path.split_at(1).1; // skip start '/'
-            let inode = ROOT_INODE.lookup_follow(abs_path, FOLLOW_MAX_DEPTH)?;
-            Ok(inode)
-        } else {
-            // relative path
-            let cwd = self.cwd.split_at(1).1; // skip start '/'
-            let inode = ROOT_INODE.lookup(cwd)?.lookup_follow(path, FOLLOW_MAX_DEPTH)?;
-            Ok(inode)
-        }
+        Ok(ROOT_INODE.lookup(&self.cwd)?.lookup_follow(path, FOLLOW_MAX_DEPTH)?)
     }
 }
 
diff --git a/kernel/src/syscall/mod.rs b/kernel/src/syscall/mod.rs
index ce68f44..4bfe201 100644
--- a/kernel/src/syscall/mod.rs
+++ b/kernel/src/syscall/mod.rs
@@ -131,11 +131,15 @@ pub fn syscall(id: usize, args: [usize; 6], tf: &mut TrapFrame) -> isize {
         SYS_GETCWD => sys_getcwd(args[0] as *mut u8, args[1]),
         // 80
         SYS_CHDIR => sys_chdir(args[0] as *const u8),
-        SYS_GETTIMEOFDAY => sys_gettimeofday(args[0] as *mut TimeVal, args[1] as *const u8),
+        SYS_FCHOWN => {
+            warn!("sys_fchown is unimplemented");
+            Ok(0)
+        }
         SYS_UMASK => {
             warn!("sys_umask is unimplemented");
             Ok(0o777)
         }
+        SYS_GETTIMEOFDAY => sys_gettimeofday(args[0] as *mut TimeVal, args[1] as *const u8),
 //        SYS_GETRLIMIT => sys_getrlimit(),
         SYS_GETRUSAGE => sys_getrusage(args[0], args[1] as *mut RUsage),
         SYS_SYSINFO => sys_sysinfo(args[0] as *mut SysInfo),
@@ -202,10 +206,16 @@ pub fn syscall(id: usize, args: [usize; 6], tf: &mut TrapFrame) -> isize {
         SYS_OPENAT => sys_openat(args[0], args[1] as *const u8, args[2], args[3]), // TODO: handle `dfd`
         SYS_MKDIRAT => sys_mkdir(args[1] as *const u8, args[2]), // TODO: handle `dfd`
 //        SYS_MKNODAT => sys_mknod(),
+        // 260
+        SYS_FCHOWNAT => {
+            warn!("sys_fchownat is unimplemented");
+            Ok(0)
+        },
         SYS_NEWFSTATAT => sys_stat(args[1] as *const u8, args[2] as *mut Stat), // TODO: handle `dfd`, `flag`
         SYS_UNLINKAT => sys_unlink(args[1] as *const u8), // TODO: handle `dfd`, `flag`
         SYS_RENAMEAT => sys_renameat(args[0], args[1] as *const u8, args[2], args[3] as *const u8), // TODO: handle `olddfd`, `newdfd`
         SYS_LINKAT => sys_link(args[1] as *const u8, args[3] as *const u8), // TODO: handle `olddfd`, `newdfd`, `flags`
+        SYS_SYMLINKAT => Err(SysError::EACCES),
         SYS_FACCESSAT => sys_access(args[1] as *const u8, args[2]), // TODO: handle `dfd`
         // 280
         SYS_UTIMENSAT => {
diff --git a/kernel/src/syscall/proc.rs b/kernel/src/syscall/proc.rs
index c95d788..446805a 100644
--- a/kernel/src/syscall/proc.rs
+++ b/kernel/src/syscall/proc.rs
@@ -1,7 +1,7 @@
 //! Syscalls for process
 
 use super::*;
-use crate::fs::{INodeExt, FOLLOW_MAX_DEPTH};
+use crate::fs::INodeExt;
 
 /// Fork the current process. Return the child's PID.
 pub fn sys_fork(tf: &TrapFrame) -> SysResult {
@@ -120,7 +120,7 @@ pub fn sys_exec(name: *const u8, argv: *const *const u8, envp: *const *const u8,
 
     // Read program file
     let path = args[0].as_str();
-    let inode = crate::fs::ROOT_INODE.lookup_follow(path, FOLLOW_MAX_DEPTH)?;
+    let inode = proc.lookup_inode(path)?;
     let buf = inode.read_as_vec()?;
 
     // Make new Thread