Disk usage Ceph kernel mount not fully working

[itsties]

Describe the bug The fields inodesUsed, inodesUsedPercent, used and usedPercent fields are always 0. The fields total and free are working fine. When I run df -H values are working fine. Only tested on Debian machine.

To Reproduce Mount

# cat /etc/fstab | grep ceph
10.3.10.1,10.3.10.2,10.3.10.3:/volumes/_nogroup/dbe31a78-4059-4df6-a6cc-21a25207768b /mnt/ceph ceph name=ceph-test,secretfile=/etc/ceph/ceph.key,_netdev,noatime 0 0

Test script

// cat test.go
package main
import (
        "fmt"
        "github.com/shirou/gopsutil/v3/disk"
)

func main() {
        v, _ := disk.Usage("/mnt/ceph")
        fmt.Println(v)
}

Output

{
  "path": "/mnt/ceph",
  "fstype": "ceph",
  "total": 107374182400,
  "free": 75061264384,
  "used": 0,
  "usedPercent": 0,
  "inodesTotal": 2167140,
  "inodesUsed": 0,
  "inodesFree": 18446744073709552000,
  "inodesUsedPercent": 0
}

Expected behavior

{
  "path": "/mnt/ceph",
  "fstype": "ceph",
  "total": 107374182400,
  "free": 75061264384,
  "used": 31555584,
  "usedPercent": 31.911490484942368,
  "inodesTotal": 2167140,
  "inodesUsed": 0,
  "inodesFree": 0,
  "inodesUsedPercent": 0
}

Environment (please complete the following information):

• [x] Linux: [paste contents of /etc/os-release and the result of uname -a]

# cat /etc/os-release
PRETTY_NAME="Debian GNU/Linux 11 (bullseye)"
NAME="Debian GNU/Linux"
VERSION_ID="11"
VERSION="11 (bullseye)"
VERSION_CODENAME=bullseye
ID=debian
HOME_URL="https://www.debian.org/"
SUPPORT_URL="https://www.debian.org/support"
BUG_REPORT_URL="https://bugs.debian.org/"
# uname -a
Linux vps2071 5.10.0-17-cloud-amd64 #1 SMP Debian 5.10.136-1 (2022-08-13) x86_64 GNU/Linux

Additional context N/A

[shirou]

disk usage on linux uses golang.org/x/sys/unix.Statfs.

It seems Statfs on ceph has something wrong. Could you this code?

package main

import (
   "fmt"
   "golang.org/x/sys/unix"
)
func main(){
  stat := unix.Statfs_t{}
  unix.Statfs("/mnt/ceph", &stat)
  fmt.Printf("%#v\n", stat)
}

[itsties]

This is my output when running your code

unix.Statfs_t{Type:12805120, Bsize:4194304, Blocks:0x6400, Bfree:0x45e8, Bavail:0x45e8, Files:0x211170, Ffree:0xffffffffffffffff, Fsid:unix.Fsid{Val:[2]int32{-1469057901, -1}}, Namelen:255, Frsize:4194304, Flags:1056, Spare:[4]int64{0, 0, 0, 0}}

or more readable fmt.Printf("%+v\n", stat)

{Type:12805120 Bsize:4194304 Blocks:25600 Bfree:17896 Bavail:17896 Files:2167163 Ffree:18446744073709551615 Fsid:{Val:[-1469057901 -1]} Namelen:255 Frsize:4194304 Flags:1056 Spare:[0 0 0 0]}

[itsties]

I believe this is where is goes wrong with my Files:2167163 & Ffree:18446744073709551615: https://github.com/shirou/gopsutil/blob/ed37dc27a286a25cbe76adf405176c69191a1f37/disk/disk_unix.go#L21-L33