missing df

[i4ki]

No description provided.

[charlessachet]

@tiago4orion

• The file that you passed me(/proc/partitions) returns:

  major minor #blocks name
  8 0 976762584 sda
  8 1 210453504 sda1
  8 2 1 sda2
  8 5 748659712 sda5
  8 6 17643744 sda6
  11 0 1048575 sr0

• Another one that maybe is usefull is /proc/mounts and returns:

  /dev/sda5 /home ext4 rw,noatime,data=ordered 0 0
  /dev/sda1 / ext4 rw,noatime,data=ordered 0 0

So... from the partition name we can found out where it is mounted.

However I'll continue searching for a file maintained by kernel that can give us the disk usage.

[i4ki]

Nice.

You'll need to use the paths in /proc/mounts to call the syscall statfs(2).
Take a look here: https://github.com/StalkR/goircbot/blob/master/lib/disk/space_unix.go#L11

[]'s
i4k

[charlessachet]

Thanks!

scall.go

package main

import (
    "fmt"
    "os"
    "syscall"
)

func main() {
    path := os.Args[1]
    scall := syscall.Statfs_t{}
    err := syscall.Statfs(path, &scall)
    if err != nil {
        panic(fmt.Sprintf("Error[%s] doing syscall to fs for path[%s]", err, path))
    }
    total := scall.Bsize * int64(scall.Blocks)
    free := scall.Bsize * int64(scall.Bfree)
    used := total - free
    usedPercentage := (float64(used) * 100) / float64(total)
    fmt.Printf("Total[%v], Free[%v], Used[%v], Used[%v]", total, free, used, usedPercentage)
}

Running:
go run scall.go /home

I just did a test comparing the output between the script and the df command:

• dfoutput:

  Filesystem 1K-blocks Used Available Use% Mounted on
  /dev/sda5 736781456 18992812 680339276 3% /home

• Script output:

  Total[754464210944], Free[735013040128], Used[19451170816], Used[2.578143606263619]%

The output has a considerable difference.
What do you think?

[]'s

[i4ki]

Found this: http://stackoverflow.com/questions/21693673/differ-in-output-of-df-and-statfs