werf/werf

//go:build linux && s390x
// +build linux,s390x

// Copyright (c) 2015-2021 MinIO, Inc.
//
// This file is part of MinIO Object Storage stack
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with this program.  If not, see <http://www.gnu.org/licenses/>.

package disk

import (
    "fmt"
    "strconv"
    "syscall"
)

// fsType2StringMap - list of filesystems supported on linux
var fsType2StringMap = map[string]string{
    "1021994":  "TMPFS",
    "137d":     "EXT",
    "4244":     "HFS",
    "4d44":     "MSDOS",
    "52654973": "REISERFS",
    "5346544e": "NTFS",
    "58465342": "XFS",
    "61756673": "AUFS",
    "6969":     "NFS",
    "ef51":     "EXT2OLD",
    "ef53":     "EXT4",
    "f15f":     "ecryptfs",
    "794c7630": "overlayfs",
    "2fc12fc1": "zfs",
    "ff534d42": "cifs",
    "53464846": "wslfs",
}

// getFSType returns the filesystem type of the underlying mounted filesystem
func getFSType(ftype uint32) string {
    fsTypeHex := strconv.FormatUint(uint64(ftype), 16)
    fsTypeString, ok := fsType2StringMap[fsTypeHex]
    if !ok {
        return "UNKNOWN"
    }
    return fsTypeString
}

// GetInfo returns total and free bytes available in a directory, e.g. `/`.
func GetInfo(path string, _ bool) (info Info, err error) {
    s := syscall.Statfs_t{}
    err = syscall.Statfs(path, &s)
    if err != nil {
        return Info{}, err
    }
    reservedBlocks := s.Bfree - s.Bavail
    info = Info{
        Total:  uint64(s.Frsize) * (s.Blocks - reservedBlocks),
        Free:   uint64(s.Frsize) * s.Bavail,
        Files:  s.Files,
        Ffree:  s.Ffree,
        FSType: getFSType(s.Type),
    }
    // Check for overflows.
    // https://github.com/minio/minio/issues/8035
    // XFS can show wrong values at times error out
    // in such scenarios.
    if info.Free > info.Total {
        return info, fmt.Errorf("detected free space (%d) > total drive space (%d), fs corruption at (%s). please run 'fsck'", info.Free, info.Total, path)
    }
    info.Used = info.Total - info.Free
    return info, nil
}