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我正在尝试计算并以百分比显示当前磁盘使用情况:

use nix::sys::statvfs::statvfs;

macro_rules! cast {
    ($x:expr) => {
        u64::from($x)
    };
}

fn main() {
    let stat = statvfs("/var/db".as_bytes()).unwrap();
    // f_frsize
    // let total_space = cast!(stat.fragment_size()) * cast!(stat.blocks());
    // let avail_space = cast!(stat.fragment_size()) * cast!(stat.blocks_available());
    // f_bsize
    let total_space = cast!(stat.block_size()) * cast!(stat.blocks());
    let avail_space = cast!(stat.block_size()) * cast!(stat.blocks_available());
    let used = total_space - avail_space;
    let usage = used * 100 / total_space;
    println!("total: {}", total_space);
    println!("avail: {}", avail_space);
    println!("used:  {}", used);
    println!("use%:  {}%", usage);
}

我当前测试系统的输出是:

total: 6779424768
avail: 3697811456
used:  3081613312
use%:  45%

的输出df -B 1 /var/db

# df -B 1 /var/db
Filesystem      1B-blocks       Used  Available Use% Mounted on
/dev/loop3     6779424768 2713636864 3697811456  43% /var/db

Used字段不匹配2713636864我正在计算它6779424768-3697811456 = 3081613312

输出df -h /var/db

# df -h /var/db
Filesystem      Size  Used Avail Use% Mounted on
/dev/loop3      6.4G  2.6G  3.5G  43% /var/db

我想我错过了一些可能转换单位的东西,我已经尝试过使用f_frsize而不是f_bsize结果仍然相同,上面的代码返回45和 df 43

有任何想法吗?

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