diff options
Diffstat (limited to 'vendor/rustix-0.36.5/src/fs/statx.rs')
-rw-r--r-- | vendor/rustix-0.36.5/src/fs/statx.rs | 91 |
1 files changed, 0 insertions, 91 deletions
diff --git a/vendor/rustix-0.36.5/src/fs/statx.rs b/vendor/rustix-0.36.5/src/fs/statx.rs deleted file mode 100644 index 383f109ce..000000000 --- a/vendor/rustix-0.36.5/src/fs/statx.rs +++ /dev/null @@ -1,91 +0,0 @@ -//! Linux `statx`. - -use crate::fd::{AsFd, BorrowedFd}; -use crate::ffi::CStr; -use crate::fs::AtFlags; -use crate::{backend, io, path}; -use core::sync::atomic::{AtomicU8, Ordering}; - -pub use backend::fs::types::{Statx, StatxFlags, StatxTimestamp}; - -/// `statx(dirfd, path, flags, mask, statxbuf)` -/// -/// This function returns [`io::Errno::NOSYS`] if `statx` is not available on -/// the platform, such as Linux before 4.11. This also includes older Docker -/// versions where the actual syscall fails with different error codes; Rustix -/// handles this and translates them into `NOSYS`. -/// -/// # References -/// - [Linux] -/// -/// [Linux]: https://man7.org/linux/man-pages/man2/statx.2.html -#[inline] -pub fn statx<P: path::Arg, Fd: AsFd>( - dirfd: Fd, - path: P, - flags: AtFlags, - mask: StatxFlags, -) -> io::Result<Statx> { - path.into_with_c_str(|path| _statx(dirfd.as_fd(), path, flags, mask)) -} - -// Linux kernel prior to 4.11 old versions of Docker don't support `statx`. We -// store the availability in a global to avoid unnecessary syscalls. -// -// 0: Unknown -// 1: Not available -// 2: Available -static STATX_STATE: AtomicU8 = AtomicU8::new(0); - -#[inline] -fn _statx( - dirfd: BorrowedFd<'_>, - path: &CStr, - flags: AtFlags, - mask: StatxFlags, -) -> io::Result<Statx> { - match STATX_STATE.load(Ordering::Relaxed) { - 0 => statx_init(dirfd, path, flags, mask), - 1 => Err(io::Errno::NOSYS), - _ => backend::fs::syscalls::statx(dirfd, path, flags, mask), - } -} - -/// The first `statx` call. We don't know if `statx` is available yet. -fn statx_init( - dirfd: BorrowedFd<'_>, - path: &CStr, - flags: AtFlags, - mask: StatxFlags, -) -> io::Result<Statx> { - match backend::fs::syscalls::statx(dirfd, path, flags, mask) { - Err(io::Errno::NOSYS) => statx_error_nosys(), - Err(io::Errno::PERM) => statx_error_perm(), - result => { - STATX_STATE.store(2, Ordering::Relaxed); - result - } - } -} - -/// The first `statx` call failed with `NOSYS` (or something we're treating -/// like `NOSYS`). -#[cold] -fn statx_error_nosys() -> io::Result<Statx> { - STATX_STATE.store(1, Ordering::Relaxed); - Err(io::Errno::NOSYS) -} - -/// The first `statx` call failed with `PERM`. -#[cold] -fn statx_error_perm() -> io::Result<Statx> { - // Some old versions of Docker have `statx` fail with `PERM` when it isn't - // recognized. Check whether `statx` really is available, and if so, fail - // with `PERM`, and if not, treat it like `NOSYS`. - if backend::fs::syscalls::is_statx_available() { - STATX_STATE.store(2, Ordering::Relaxed); - Err(io::Errno::PERM) - } else { - statx_error_nosys() - } -} |