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//! 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
ST_RDONLY;
/// Do not allow the set-uid bits to have an effect
ST_NOSUID;
/// Do not interpret character or block-special devices
#[cfg(any(target_os = "android", target_os = "linux"))]
ST_NODEV;
/// Do not allow execution of binaries on the filesystem
#[cfg(any(target_os = "android", target_os = "linux"))]
ST_NOEXEC;
/// All IO should be done synchronously
#[cfg(any(target_os = "android", target_os = "linux"))]
ST_SYNCHRONOUS;
/// Allow mandatory locks on the filesystem
#[cfg(any(target_os = "android", target_os = "linux"))]
ST_MANDLOCK;
/// Write on file/directory/symlink
#[cfg(target_os = "linux")]
ST_WRITE;
/// Append-only file
#[cfg(target_os = "linux")]
ST_APPEND;
/// Immutable file
#[cfg(target_os = "linux")]
ST_IMMUTABLE;
/// Do not update access times on files
#[cfg(any(target_os = "android", target_os = "linux"))]
ST_NOATIME;
/// Do not update access times on files
#[cfg(any(target_os = "android", target_os = "linux"))]
ST_NODIRATIME;
/// Update access time relative to modify/change time
#[cfg(any(target_os = "android", all(target_os = "linux", not(target_env = "musl"))))]
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"))]
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("/".as_bytes()).unwrap();
}
#[test]
fn fstatvfs_call() {
let root = File::open("/").unwrap();
fstatvfs(&root).unwrap();
}
}
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