1 files changed, 174 insertions, 0 deletions
diff --git a/third_party/rust/nix/src/sys/statvfs.rs b/third_party/rust/nix/src/sys/statvfs.rs
new file mode 100644
index 0000000000..38b1fdcc50
--- /dev/null
+++ b/third_party/rust/nix/src/sys/statvfs.rs
@@ -0,0 +1,174 @@
+//! Get filesystem statistics
+//!
+//! See [the man pages](https://pubs.opengroup.org/onlinepubs/9699919799/functions/fstatvfs.html)
+//! for more details.
+use std::mem;
+use std::os::unix::io::AsRawFd;
+
+use libc::{self, c_ulong};
+
+use crate::{Result, NixPath, errno::Errno};
+
+#[cfg(not(target_os = "redox"))]
+libc_bitflags!(
+    /// File system mount Flags
+    #[repr(C)]
+    #[derive(Default)]
+    pub struct FsFlags: c_ulong {
+        /// Read Only
+        #[cfg(not(target_os = "haiku"))]
+        ST_RDONLY;
+        /// Do not allow the set-uid bits to have an effect
+        #[cfg(not(target_os = "haiku"))]
+        ST_NOSUID;
+        /// Do not interpret character or block-special devices
+        #[cfg(any(target_os = "android", target_os = "linux"))]
+        #[cfg_attr(docsrs, doc(cfg(all())))]
+        ST_NODEV;
+        /// Do not allow execution of binaries on the filesystem
+        #[cfg(any(target_os = "android", target_os = "linux"))]
+        #[cfg_attr(docsrs, doc(cfg(all())))]
+        ST_NOEXEC;
+        /// All IO should be done synchronously
+        #[cfg(any(target_os = "android", target_os = "linux"))]
+        #[cfg_attr(docsrs, doc(cfg(all())))]
+        ST_SYNCHRONOUS;
+        /// Allow mandatory locks on the filesystem
+        #[cfg(any(target_os = "android", target_os = "linux"))]
+        #[cfg_attr(docsrs, doc(cfg(all())))]
+        ST_MANDLOCK;
+        /// Write on file/directory/symlink
+        #[cfg(target_os = "linux")]
+        #[cfg_attr(docsrs, doc(cfg(all())))]
+        ST_WRITE;
+        /// Append-only file
+        #[cfg(target_os = "linux")]
+        #[cfg_attr(docsrs, doc(cfg(all())))]
+        ST_APPEND;
+        /// Immutable file
+        #[cfg(target_os = "linux")]
+        #[cfg_attr(docsrs, doc(cfg(all())))]
+        ST_IMMUTABLE;
+        /// Do not update access times on files
+        #[cfg(any(target_os = "android", target_os = "linux"))]
+        #[cfg_attr(docsrs, doc(cfg(all())))]
+        ST_NOATIME;
+        /// Do not update access times on files
+        #[cfg(any(target_os = "android", target_os = "linux"))]
+        #[cfg_attr(docsrs, doc(cfg(all())))]
+        ST_NODIRATIME;
+        /// Update access time relative to modify/change time
+        #[cfg(any(target_os = "android", all(target_os = "linux", not(target_env = "musl"))))]
+        #[cfg_attr(docsrs, doc(cfg(all())))]
+        ST_RELATIME;
+    }
+);
+
+/// Wrapper around the POSIX `statvfs` struct
+///
+/// For more information see the [`statvfs(3)` man pages](https://pubs.opengroup.org/onlinepubs/9699919799/basedefs/sys_statvfs.h.html).
+#[repr(transparent)]
+#[derive(Clone, Copy, Debug, Eq, Hash, PartialEq)]
+pub struct Statvfs(libc::statvfs);
+
+impl Statvfs {
+    /// get the file system block size
+    pub fn block_size(&self) -> c_ulong {
+        self.0.f_bsize
+    }
+
+    /// Get the fundamental file system block size
+    pub fn fragment_size(&self) -> c_ulong {
+        self.0.f_frsize
+    }
+
+    /// Get the number of blocks.
+    ///
+    /// Units are in units of `fragment_size()`
+    pub fn blocks(&self) -> libc::fsblkcnt_t {
+        self.0.f_blocks
+    }
+
+    /// Get the number of free blocks in the file system
+    pub fn blocks_free(&self) -> libc::fsblkcnt_t {
+        self.0.f_bfree
+    }
+
+    /// Get the number of free blocks for unprivileged users
+    pub fn blocks_available(&self) -> libc::fsblkcnt_t {
+        self.0.f_bavail
+    }
+
+    /// Get the total number of file inodes
+    pub fn files(&self) -> libc::fsfilcnt_t {
+        self.0.f_files
+    }
+
+    /// Get the number of free file inodes
+    pub fn files_free(&self) -> libc::fsfilcnt_t {
+        self.0.f_ffree
+    }
+
+    /// Get the number of free file inodes for unprivileged users
+    pub fn files_available(&self) -> libc::fsfilcnt_t {
+        self.0.f_favail
+    }
+
+    /// Get the file system id
+    pub fn filesystem_id(&self) -> c_ulong {
+        self.0.f_fsid
+    }
+
+    /// Get the mount flags
+    #[cfg(not(target_os = "redox"))]
+    #[cfg_attr(docsrs, doc(cfg(all())))]
+    pub fn flags(&self) -> FsFlags {
+        FsFlags::from_bits_truncate(self.0.f_flag)
+    }
+
+    /// Get the maximum filename length
+    pub fn name_max(&self) -> c_ulong {
+        self.0.f_namemax
+    }
+
+}
+
+/// Return a `Statvfs` object with information about the `path`
+pub fn statvfs<P: ?Sized + NixPath>(path: &P) -> Result<Statvfs> {
+    unsafe {
+        Errno::clear();
+        let mut stat = mem::MaybeUninit::<libc::statvfs>::uninit();
+        let res = path.with_nix_path(|path|
+            libc::statvfs(path.as_ptr(), stat.as_mut_ptr())
+        )?;
+
+        Errno::result(res).map(|_| Statvfs(stat.assume_init()))
+    }
+}
+
+/// Return a `Statvfs` object with information about `fd`
+pub fn fstatvfs<T: AsRawFd>(fd: &T) -> Result<Statvfs> {
+    unsafe {
+        Errno::clear();
+        let mut stat = mem::MaybeUninit::<libc::statvfs>::uninit();
+        Errno::result(libc::fstatvfs(fd.as_raw_fd(), stat.as_mut_ptr()))
+            .map(|_| Statvfs(stat.assume_init()))
+    }
+}
+
+#[cfg(test)]
+mod test {
+    use std::fs::File;
+    use crate::sys::statvfs::*;
+
+    #[test]
+    fn statvfs_call() {
+        statvfs(&b"/"[..]).unwrap();
+    }
+
+    #[test]
+    fn fstatvfs_call() {
+        let root = File::open("/").unwrap();
+        fstatvfs(&root).unwrap();
+    }
+}