[libos] faccessat only accepts three parameters

src/libos/src/fs/file_ops/access.rs

@@ -22,6 +22,7 @@ impl AccessibilityCheckMode {
     }
 }
 
+#[allow(dead_code)]
 bitflags! {
     pub struct AccessibilityCheckFlags : u32 {
         /// If path is a symbolic link, do not dereference it
@@ -31,31 +32,21 @@ bitflags! {
     }
 }
 
+#[allow(dead_code)]
 impl AccessibilityCheckFlags {
     pub fn from_u32(bits: u32) -> Result<Self> {
         AccessibilityCheckFlags::from_bits(bits).ok_or_else(|| errno!(EINVAL, "invalid flags"))
     }
 }
 
-pub fn do_faccessat(
-    fs_path: &FsPath,
-    mode: AccessibilityCheckMode,
-    flags: AccessibilityCheckFlags,
-) -> Result<()> {
-    debug!(
-        "faccessat: fs_path: {:?}, mode: {:?}, flags: {:?}",
-        fs_path, mode, flags
-    );
+pub fn do_faccessat(fs_path: &FsPath, mode: AccessibilityCheckMode) -> Result<()> {
+    debug!("faccessat: fs_path: {:?}, mode: {:?}", fs_path, mode);
 
     let inode = {
         let path = fs_path.to_abs_path()?;
         let current = current!();
         let fs = current.fs().read().unwrap();
-        if flags.contains(AccessibilityCheckFlags::AT_SYMLINK_NOFOLLOW) {
-            fs.lookup_inode_no_follow(&path)?
-        } else {
-            fs.lookup_inode(&path)?
-        }
+        fs.lookup_inode(&path)?
     };
     if mode.test_for_exist() {
         return Ok(());

src/libos/src/fs/file_ops/mod.rs

@@ -1,7 +1,7 @@
 use super::*;
 use process::Process;
 
-pub use self::access::{do_faccessat, AccessibilityCheckFlags, AccessibilityCheckMode};
+pub use self::access::{do_faccessat, AccessibilityCheckMode};
 pub use self::chmod::{do_fchmod, do_fchmodat, FileMode};
 pub use self::chown::{do_fchown, do_fchownat, ChownFlags};
 pub use self::close::do_close;

src/libos/src/fs/syscalls.rs

@@ -1,8 +1,8 @@
 use super::event_file::EventCreationFlags;
 use super::file_ops;
 use super::file_ops::{
-    get_abs_path_by_fd, get_utimes, AccessibilityCheckFlags, AccessibilityCheckMode, ChownFlags,
-    FcntlCmd, FsPath, LinkFlags, StatFlags, UnlinkFlags, Utime, UtimeFlags, AT_FDCWD, UTIME_OMIT,
+    get_abs_path_by_fd, get_utimes, AccessibilityCheckMode, ChownFlags, FcntlCmd, FsPath,
+    LinkFlags, StatFlags, UnlinkFlags, Utime, UtimeFlags, AT_FDCWD, UTIME_OMIT,
 };
 use super::fs_ops;
 use super::fs_ops::{MountFlags, MountOptions, UmountFlags};
@@ -304,17 +304,16 @@ pub fn do_fstatat(dirfd: i32, path: *const i8, stat_buf: *mut Stat, flags: u32)
 }
 
 pub fn do_access(path: *const i8, mode: u32) -> Result<isize> {
-    self::do_faccessat(AT_FDCWD, path, mode, 0)
+    self::do_faccessat(AT_FDCWD, path, mode)
 }
 
-pub fn do_faccessat(dirfd: i32, path: *const i8, mode: u32, flags: u32) -> Result<isize> {
+pub fn do_faccessat(dirfd: i32, path: *const i8, mode: u32) -> Result<isize> {
     let path = from_user::clone_cstring_safely(path)?
         .to_string_lossy()
         .into_owned();
     let fs_path = FsPath::new(&path, dirfd, false)?;
     let mode = AccessibilityCheckMode::from_u32(mode)?;
-    let flags = AccessibilityCheckFlags::from_u32(flags)?;
-    file_ops::do_faccessat(&fs_path, mode, flags).map(|_| 0)
+    file_ops::do_faccessat(&fs_path, mode).map(|_| 0)
 }
 
 pub fn do_lseek(fd: FileDesc, offset: off_t, whence: i32) -> Result<isize> {

src/libos/src/syscall/mod.rs

@@ -366,7 +366,7 @@ macro_rules! process_syscall_table_with_callback {
             (Symlinkat = 266) => do_symlinkat(target: *const i8, new_dirfd: i32, link_path: *const i8),
             (Readlinkat = 267) => do_readlinkat(dirfd: i32, path: *const i8, buf: *mut u8, size: usize),
             (Fchmodat = 268) => do_fchmodat(dirfd: i32, path: *const i8, mode: u16),
-            (Faccessat = 269) => do_faccessat(dirfd: i32, path: *const i8, mode: u32, flags: u32),
+            (Faccessat = 269) => do_faccessat(dirfd: i32, path: *const i8, mode: u32),
             (Pselect6 = 270) => do_pselect6(nfds: c_int, readfds: *mut libc::fd_set, writefds: *mut libc::fd_set, exceptfds: *mut libc::fd_set, timeout: *mut timespec_t, data: *const sigset_argpack),
             (Ppoll = 271) => do_ppoll(fds: *mut libc::pollfd, nfds: libc::nfds_t, timeout_ts: *const timespec_t, sigmask: *const sigset_t),
             (Unshare = 272) => handle_unsupported(),