nix/sys/
statvfs.rs

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
//! 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::{AsFd, AsRawFd};

use libc::{self, c_ulong};

use crate::{errno::Errno, NixPath, Result};

#[cfg(not(target_os = "redox"))]
libc_bitflags!(
    /// File system mount Flags
    #[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(linux_android)]
        ST_NODEV;
        /// Do not allow execution of binaries on the filesystem
        #[cfg(linux_android)]
        ST_NOEXEC;
        /// All IO should be done synchronously
        #[cfg(linux_android)]
        ST_SYNCHRONOUS;
        /// Allow mandatory locks on the filesystem
        #[cfg(linux_android)]
        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(linux_android)]
        ST_NOATIME;
        /// Do not update access times on files
        #[cfg(linux_android)]
        ST_NODIRATIME;
        /// Update access time relative to modify/change time
        #[cfg(any(target_os = "android", all(target_os = "linux", not(target_env = "musl"), not(target_env = "ohos"))))]
        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
    #[cfg(not(target_os = "hurd"))]
    pub fn filesystem_id(&self) -> c_ulong {
        self.0.f_fsid
    }
    /// Get the file system id
    #[cfg(target_os = "hurd")]
    pub fn filesystem_id(&self) -> u64 {
        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<Fd: AsFd>(fd: Fd) -> Result<Statvfs> {
    unsafe {
        Errno::clear();
        let mut stat = mem::MaybeUninit::<libc::statvfs>::uninit();
        Errno::result(libc::fstatvfs(fd.as_fd().as_raw_fd(), stat.as_mut_ptr()))
            .map(|_| Statvfs(stat.assume_init()))
    }
}