[libos] Add support for UTIME

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

@@ -29,6 +29,9 @@ pub use self::stat::{do_fstat, do_fstatat, Stat, StatFlags};
 pub use self::symlink::{do_readlinkat, do_symlinkat};
 pub use self::truncate::{do_ftruncate, do_truncate};
 pub use self::unlink::{do_unlinkat, UnlinkFlags};
+pub use self::utimes::{
+    do_utimes_fd, do_utimes_path, get_utimes, utimbuf_t, Utime, UtimeFlags, UTIME_OMIT,
+};
 pub use self::write::{do_pwrite, do_write, do_writev};
 
 mod access;
@@ -56,4 +59,5 @@ mod stat;
 mod symlink;
 mod truncate;
 mod unlink;
+mod utimes;
 mod write;

src/libos/src/fs/file_ops/utimes.rs

@@ -0,0 +1,138 @@
+use crate::util::mem_util::from_user;
+
+use super::time::{timespec_t, OcclumTimeProvider};
+use super::*;
+
+use rcore_fs::dev::TimeProvider;
+
+const UTIME_NOW: i64 = (1i64 << 30) - 1i64;
+pub const UTIME_OMIT: i64 = (1i64 << 30) - 2i64;
+
+bitflags! {
+    pub struct UtimeFlags: i32 {
+        const AT_SYMLINK_NOFOLLOW = 1 << 8;
+    }
+}
+
+#[repr(C)]
+#[derive(Copy, Clone)]
+#[allow(non_camel_case_types)]
+pub struct utimbuf_t {
+    atime: time_t,
+    mtime: time_t,
+}
+
+impl utimbuf_t {
+    pub fn atime(&self) -> time_t {
+        self.atime
+    }
+
+    pub fn mtime(&self) -> time_t {
+        self.mtime
+    }
+}
+
+#[derive(Debug)]
+#[allow(non_camel_case_types)]
+pub enum Utime {
+    UTIME_OMIT,
+    UTIME_NOW,
+    UTIME(Timespec),
+}
+
+pub fn get_utimes(times: Option<(timespec_t, timespec_t)>) -> Result<(Utime, Utime)> {
+    let now = OcclumTimeProvider.current_time();
+    if let Some(times) = times {
+        let (atime, mtime) = times;
+
+        if (!timespec_valid(atime)) || (!timespec_valid(mtime)) {
+            return_errno!(EINVAL, "parameter: times is invalid")
+        }
+
+        let atime = if atime.nsec() == UTIME_OMIT {
+            Utime::UTIME_OMIT
+        } else if atime.nsec() == UTIME_NOW {
+            Utime::UTIME(now)
+        } else {
+            Utime::UTIME(Timespec {
+                sec: atime.sec(),
+                nsec: atime.nsec(),
+            })
+        };
+        let mtime = if mtime.nsec() == UTIME_OMIT {
+            Utime::UTIME_OMIT
+        } else if mtime.nsec() == UTIME_NOW {
+            Utime::UTIME(now)
+        } else {
+            Utime::UTIME(Timespec {
+                sec: mtime.sec(),
+                nsec: mtime.nsec(),
+            })
+        };
+        Ok((atime, mtime))
+    } else {
+        Ok((Utime::UTIME(now), Utime::UTIME(now)))
+    }
+}
+
+fn timespec_valid(time: timespec_t) -> bool {
+    if (time.nsec() == UTIME_NOW || time.nsec() == UTIME_OMIT) {
+        true
+    } else {
+        time.sec() >= 0 && time.nsec() >= 0 && time.nsec() < 1_000_000_000
+    }
+}
+
+pub fn do_utimes_fd(fd: FileDesc, atime: Utime, mtime: Utime, flags: i32) -> Result<isize> {
+    debug!(
+        "utimes_fd: fd: {:?}, atime: {:?}, mtime: {:?}, flags: {:?}",
+        fd, atime, mtime, flags
+    );
+
+    if flags != 0 {
+        return_errno!(EINVAL, "parameter: flags is invalid");
+    }
+
+    let file_ref = current!().file(fd)?;
+    let mut info = file_ref.metadata()?;
+    if let Utime::UTIME(atime) = atime {
+        info.atime = atime;
+    }
+    if let Utime::UTIME(mtime) = mtime {
+        info.mtime = mtime;
+    }
+    file_ref.set_metadata(&info)?;
+    Ok(0)
+}
+
+pub fn do_utimes_path(
+    fs_path: &FsPath,
+    atime: Utime,
+    mtime: Utime,
+    flags: UtimeFlags,
+) -> Result<isize> {
+    debug!(
+        "utimes_path: fs_path: {:?}, atime: {:?}, mtime: {:?}, flags: {:?}",
+        fs_path, atime, mtime, flags
+    );
+
+    let inode = {
+        let path = fs_path.to_abs_path()?;
+        let current = current!();
+        let fs = current.fs().read().unwrap();
+        if flags.contains(UtimeFlags::AT_SYMLINK_NOFOLLOW) {
+            fs.lookup_inode_no_follow(&path)?
+        } else {
+            fs.lookup_inode(&path)?
+        }
+    };
+    let mut info = inode.metadata()?;
+    if let Utime::UTIME(atime) = atime {
+        info.atime = atime;
+    }
+    if let Utime::UTIME(mtime) = mtime {
+        info.mtime = mtime;
+    }
+    inode.set_metadata(&info)?;
+    Ok(0)
+}

src/libos/src/fs/mod.rs

@@ -19,8 +19,8 @@ pub use self::event_file::{AsEvent, EventCreationFlags, EventFile};
 pub use self::events::{AtomicIoEvents, IoEvents, IoNotifier};
 pub use self::file::{File, FileRef};
 pub use self::file_ops::{
-    occlum_ocall_ioctl, AccessMode, BuiltinIoctlNum, CreationFlags, FallocateFlags, FileMode,
-    IfConf, IoctlCmd, Stat, StatusFlags, StructuredIoctlArgType, StructuredIoctlNum,
+    occlum_ocall_ioctl, utimbuf_t, AccessMode, BuiltinIoctlNum, CreationFlags, FallocateFlags,
+    FileMode, IfConf, IoctlCmd, Stat, StatusFlags, StructuredIoctlArgType, StructuredIoctlNum,
 };
 pub use self::file_table::{FileDesc, FileTable, FileTableEvent, FileTableNotifier};
 pub use self::fs_ops::Statfs;

src/libos/src/fs/syscalls.rs

@@ -1,12 +1,12 @@
 use super::event_file::EventCreationFlags;
 use super::file_ops;
 use super::file_ops::{
-    get_abs_path_by_fd, AccessibilityCheckFlags, AccessibilityCheckMode, ChownFlags, FcntlCmd,
-    FsPath, LinkFlags, StatFlags, UnlinkFlags, AT_FDCWD,
+    get_abs_path_by_fd, get_utimes, AccessibilityCheckFlags, AccessibilityCheckMode, ChownFlags,
+    FcntlCmd, FsPath, LinkFlags, StatFlags, UnlinkFlags, Utime, UtimeFlags, AT_FDCWD, UTIME_OMIT,
 };
 use super::fs_ops;
 use super::fs_ops::{MountFlags, MountOptions, UmountFlags};
-use super::time::{clockid_t, itimerspec_t, ClockID};
+use super::time::{clockid_t, itimerspec_t, timespec_t, timeval_t, ClockID};
 use super::timer_file::{TimerCreationFlags, TimerSetFlags};
 use super::*;
 use config::ConfigMountFsType;
@@ -700,3 +700,87 @@ pub fn do_flock(fd: FileDesc, operation: i32) -> Result<isize> {
     file_ops::do_flock(fd, flock_ops)?;
     Ok(0)
 }
+
+pub fn do_utime(path: *const i8, times_u: *const utimbuf_t) -> Result<isize> {
+    let times = if !times_u.is_null() {
+        from_user::check_ptr(times_u)?;
+        let utimbuf = unsafe { *times_u };
+        let atime = timespec_t::from(utimbuf.atime());
+        atime.validate()?;
+        let mtime = timespec_t::from(utimbuf.mtime());
+        mtime.validate()?;
+        Some((atime, mtime))
+    } else {
+        None
+    };
+
+    let (atime, mtime) = file_ops::get_utimes(times)?;
+    self::do_utimes_wrapper(AT_FDCWD, path, atime, mtime, 0)
+}
+
+pub fn do_utimes(path: *const i8, times: *const timeval_t) -> Result<isize> {
+    self::do_futimesat(AT_FDCWD, path, times)
+}
+
+pub fn do_futimesat(dirfd: i32, path: *const i8, times_u: *const timeval_t) -> Result<isize> {
+    let times = if !times_u.is_null() {
+        from_user::check_array(times_u, 2)?;
+        let atime_ptr = unsafe { times_u.offset(0) };
+        let atime = unsafe { *atime_ptr };
+        let atime = timespec_t::from(atime);
+        atime.validate()?;
+        let mtime_ptr = unsafe { times_u.offset(1) };
+        let mtime = unsafe { *mtime_ptr };
+        let mtime = timespec_t::from(mtime);
+        mtime.validate()?;
+        Some((atime, mtime))
+    } else {
+        None
+    };
+
+    let (atime, mtime) = file_ops::get_utimes(times)?;
+    self::do_utimes_wrapper(dirfd, path, atime, mtime, 0)
+}
+
+pub fn do_utimensat(
+    dirfd: i32,
+    path: *const i8,
+    times_u: *const timespec_t,
+    flags: i32,
+) -> Result<isize> {
+    let times = if !times_u.is_null() {
+        from_user::check_array(times_u, 2)?;
+        let atime_ptr = unsafe { times_u.offset(0) };
+        let atime = unsafe { *atime_ptr };
+        let mtime_ptr = unsafe { times_u.offset(1) };
+        let mtime = unsafe { *mtime_ptr };
+        if atime.nsec() == UTIME_OMIT && mtime.nsec() == UTIME_OMIT {
+            return Ok(0);
+        }
+        Some((atime, mtime))
+    } else {
+        None
+    };
+
+    let (atime, mtime) = file_ops::get_utimes(times)?;
+    self::do_utimes_wrapper(dirfd, path, atime, mtime, flags)
+}
+
+fn do_utimes_wrapper(
+    dirfd: i32,
+    path: *const i8,
+    atime: Utime,
+    mtime: Utime,
+    flags: i32,
+) -> Result<isize> {
+    if path.is_null() && dirfd != AT_FDCWD {
+        file_ops::do_utimes_fd(dirfd as FileDesc, atime, mtime, flags)
+    } else {
+        let path = from_user::clone_cstring_safely(path)?
+            .to_string_lossy()
+            .into_owned();
+        let flags = UtimeFlags::from_bits(flags).ok_or_else(|| errno!(EINVAL, "invalid flags"))?;
+        let fs_path = FsPath::new(&path, dirfd, false)?;
+        file_ops::do_utimes_path(&fs_path, atime, mtime, flags)
+    }
+}

src/libos/src/syscall/mod.rs

@@ -25,13 +25,14 @@ use crate::fs::{
     do_access, do_chdir, do_chmod, do_chown, do_close, do_creat, do_dup, do_dup2, do_dup3,
     do_eventfd, do_eventfd2, do_faccessat, do_fallocate, do_fchdir, do_fchmod, do_fchmodat,
     do_fchown, do_fchownat, do_fcntl, do_fdatasync, do_flock, do_fstat, do_fstatat, do_fstatfs,
-    do_fsync, do_ftruncate, do_getcwd, do_getdents, do_getdents64, do_ioctl, do_lchown, do_link,
-    do_linkat, do_lseek, do_lstat, do_mkdir, do_mkdirat, do_mount, do_mount_rootfs, do_open,
-    do_openat, do_pipe, do_pipe2, do_pread, do_pwrite, do_read, do_readlink, do_readlinkat,
-    do_readv, do_rename, do_renameat, do_rmdir, do_sendfile, do_stat, do_statfs, do_symlink,
-    do_symlinkat, do_sync, do_timerfd_create, do_timerfd_gettime, do_timerfd_settime, do_truncate,
-    do_umask, do_umount, do_unlink, do_unlinkat, do_write, do_writev, iovec_t, AsTimer, File,
-    FileDesc, FileRef, HostStdioFds, Stat, Statfs,
+    do_fsync, do_ftruncate, do_futimesat, do_getcwd, do_getdents, do_getdents64, do_ioctl,
+    do_lchown, do_link, do_linkat, do_lseek, do_lstat, do_mkdir, do_mkdirat, do_mount,
+    do_mount_rootfs, do_open, do_openat, do_pipe, do_pipe2, do_pread, do_pwrite, do_read,
+    do_readlink, do_readlinkat, do_readv, do_rename, do_renameat, do_rmdir, do_sendfile, do_stat,
+    do_statfs, do_symlink, do_symlinkat, do_sync, do_timerfd_create, do_timerfd_gettime,
+    do_timerfd_settime, do_truncate, do_umask, do_umount, do_unlink, do_unlinkat, do_utime,
+    do_utimensat, do_utimes, do_write, do_writev, iovec_t, utimbuf_t, AsTimer, File, FileDesc,
+    FileRef, HostStdioFds, Stat, Statfs,
 };
 use crate::interrupt::{do_handle_interrupt, sgx_interrupt_info_t};
 use crate::misc::{resource_t, rlimit_t, sysinfo_t, utsname_t, RandFlags};
@@ -220,7 +221,7 @@ macro_rules! process_syscall_table_with_callback {
             (RtSigqueueinfo = 129) => handle_unsupported(),
             (RtSigsuspend = 130) => handle_unsupported(),
             (Sigaltstack = 131) => do_sigaltstack(ss: *const stack_t, old_ss: *mut stack_t, context: *const CpuContext),
-            (Utime = 132) => handle_unsupported(),
+            (Utime = 132) => do_utime(path: *const i8, times: *const utimbuf_t),
             (Mknod = 133) => handle_unsupported(),
             (Uselib = 134) => handle_unsupported(),
             (Personality = 135) => handle_unsupported(),
@@ -323,7 +324,7 @@ macro_rules! process_syscall_table_with_callback {
             (EpollWait = 232) => do_epoll_wait(epfd: c_int, events: *mut libc::epoll_event, maxevents: c_int, timeout: c_int),
             (EpollCtl = 233) => do_epoll_ctl(epfd: c_int, op: c_int, fd: c_int, event: *const libc::epoll_event),
             (Tgkill = 234) => do_tgkill(pid: i32, tid: pid_t, sig: c_int),
-            (Utimes = 235) => handle_unsupported(),
+            (Utimes = 235) => do_utimes(path: *const i8, times: *const timeval_t),
             (Vserver = 236) => handle_unsupported(),
             (Mbind = 237) => handle_unsupported(),
             (SetMempolicy = 238) => handle_unsupported(),
@@ -349,7 +350,7 @@ macro_rules! process_syscall_table_with_callback {
             (Mkdirat = 258) => do_mkdirat(dirfd: i32, path: *const i8, mode: u16),
             (Mknodat = 259) => handle_unsupported(),
             (Fchownat = 260) => do_fchownat(dirfd: i32, path: *const i8, uid: u32, gid: u32, flags: i32),
-            (Futimesat = 261) => handle_unsupported(),
+            (Futimesat = 261) => do_futimesat(dirfd: i32, path: *const i8, times: *const timeval_t),
             (Fstatat = 262) => do_fstatat(dirfd: i32, path: *const i8, stat_buf: *mut Stat, flags: u32),
             (Unlinkat = 263) => do_unlinkat(dirfd: i32, path: *const i8, flags: i32),
             (Renameat = 264) => do_renameat(olddirfd: i32, oldpath: *const i8, newdirfd: i32, newpath: *const i8),
@@ -368,7 +369,7 @@ macro_rules! process_syscall_table_with_callback {
             (SyncFileRange = 277) => handle_unsupported(),
             (Vmsplice = 278) => handle_unsupported(),
             (MovePages = 279) => handle_unsupported(),
-            (Utimensat = 280) => handle_unsupported(),
+            (Utimensat = 280) => do_utimensat(dirfd: i32, path: *const i8, times: *const timespec_t, flags: i32),
             (EpollPwait = 281) => do_epoll_pwait(epfd: c_int, events: *mut libc::epoll_event, maxevents: c_int, timeout: c_int, sigmask: *const usize),
             (Signalfd = 282) => handle_unsupported(),
             (TimerfdCreate = 283) => do_timerfd_create(clockid: clockid_t, flags: i32 ),

src/libos/src/time/mod.rs

@@ -48,6 +48,14 @@ impl timeval_t {
         }
     }
 
+    pub fn sec(&self) -> time_t {
+        self.sec
+    }
+
+    pub fn usec(&self) -> suseconds_t {
+        self.usec
+    }
+
     pub fn as_duration(&self) -> Duration {
         Duration::new(self.sec as u64, (self.usec * 1_000) as u32)
     }
@@ -92,6 +100,21 @@ impl From<Duration> for timespec_t {
     }
 }
 
+impl From<timeval_t> for timespec_t {
+    fn from(timval: timeval_t) -> timespec_t {
+        timespec_t {
+            sec: timval.sec(),
+            nsec: timval.usec() * 1_000,
+        }
+    }
+}
+
+impl From<time_t> for timespec_t {
+    fn from(time: time_t) -> timespec_t {
+        timespec_t { sec: time, nsec: 0 }
+    }
+}
+
 impl timespec_t {
     pub fn from_raw_ptr(ptr: *const timespec_t) -> Result<timespec_t> {
         let ts = unsafe { *ptr };