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//go:build linux
package graphdriver
import (
"path/filepath"
"github.com/containers/storage/pkg/mount"
"github.com/sirupsen/logrus"
"golang.org/x/sys/unix"
)
const (
// FsMagicAufs filesystem id for Aufs
FsMagicAufs = FsMagic(0x61756673)
// FsMagicBtrfs filesystem id for Btrfs
FsMagicBtrfs = FsMagic(0x9123683E)
// FsMagicCramfs filesystem id for Cramfs
FsMagicCramfs = FsMagic(0x28cd3d45)
// FsMagicEcryptfs filesystem id for eCryptfs
FsMagicEcryptfs = FsMagic(0xf15f)
// FsMagicExtfs filesystem id for Extfs
FsMagicExtfs = FsMagic(0x0000EF53)
// FsMagicF2fs filesystem id for F2fs
FsMagicF2fs = FsMagic(0xF2F52010)
// FsMagicGPFS filesystem id for GPFS
FsMagicGPFS = FsMagic(0x47504653)
// FsMagicJffs2Fs filesystem if for Jffs2Fs
FsMagicJffs2Fs = FsMagic(0x000072b6)
// FsMagicJfs filesystem id for Jfs
FsMagicJfs = FsMagic(0x3153464a)
// FsMagicNfsFs filesystem id for NfsFs
FsMagicNfsFs = FsMagic(0x00006969)
// FsMagicRAMFs filesystem id for RamFs
FsMagicRAMFs = FsMagic(0x858458f6)
// FsMagicReiserFs filesystem id for ReiserFs
FsMagicReiserFs = FsMagic(0x52654973)
// FsMagicSmbFs filesystem id for SmbFs
FsMagicSmbFs = FsMagic(0x0000517B)
// FsMagicSquashFs filesystem id for SquashFs
FsMagicSquashFs = FsMagic(0x73717368)
// FsMagicTmpFs filesystem id for TmpFs
FsMagicTmpFs = FsMagic(0x01021994)
// FsMagicVxFS filesystem id for VxFs
FsMagicVxFS = FsMagic(0xa501fcf5)
// FsMagicXfs filesystem id for Xfs
FsMagicXfs = FsMagic(0x58465342)
// FsMagicZfs filesystem id for Zfs
FsMagicZfs = FsMagic(0x2fc12fc1)
// FsMagicOverlay filesystem id for overlay
FsMagicOverlay = FsMagic(0x794C7630)
// FsMagicFUSE filesystem id for FUSE
FsMagicFUSE = FsMagic(0x65735546)
// FsMagicAcfs filesystem id for Acfs
FsMagicAcfs = FsMagic(0x61636673)
// FsMagicAfs filesystem id for Afs
FsMagicAfs = FsMagic(0x5346414f)
// FsMagicCephFs filesystem id for Ceph
FsMagicCephFs = FsMagic(0x00C36400)
// FsMagicCIFS filesystem id for CIFS
FsMagicCIFS = FsMagic(0xFF534D42)
// FsMagicEROFS filesystem id for EROFS
FsMagicEROFS = FsMagic(0xE0F5E1E2)
// FsMagicFHGFS filesystem id for FHGFS
FsMagicFHGFSFs = FsMagic(0x19830326)
// FsMagicIBRIX filesystem id for IBRIX
FsMagicIBRIX = FsMagic(0x013111A8)
// FsMagicKAFS filesystem id for KAFS
FsMagicKAFS = FsMagic(0x6B414653)
// FsMagicLUSTRE filesystem id for LUSTRE
FsMagicLUSTRE = FsMagic(0x0BD00BD0)
// FsMagicNCP filesystem id for NCP
FsMagicNCP = FsMagic(0x564C)
// FsMagicNFSD filesystem id for NFSD
FsMagicNFSD = FsMagic(0x6E667364)
// FsMagicOCFS2 filesystem id for OCFS2
FsMagicOCFS2 = FsMagic(0x7461636F)
// FsMagicPANFS filesystem id for PANFS
FsMagicPANFS = FsMagic(0xAAD7AAEA)
// FsMagicPRLFS filesystem id for PRLFS
FsMagicPRLFS = FsMagic(0x7C7C6673)
// FsMagicSMB2 filesystem id for SMB2
FsMagicSMB2 = FsMagic(0xFE534D42)
// FsMagicSNFS filesystem id for SNFS
FsMagicSNFS = FsMagic(0xBEEFDEAD)
// FsMagicVBOXSF filesystem id for VBOXSF
FsMagicVBOXSF = FsMagic(0x786F4256)
// FsMagicVXFS filesystem id for VXFS
FsMagicVXFS = FsMagic(0xA501FCF5)
)
var (
// Slice of drivers that should be used in an order
Priority = []string{
"overlay",
"aufs",
"btrfs",
"zfs",
"vfs",
}
// FsNames maps filesystem id to name of the filesystem.
FsNames = map[FsMagic]string{
FsMagicAufs: "aufs",
FsMagicBtrfs: "btrfs",
FsMagicCramfs: "cramfs",
FsMagicEcryptfs: "ecryptfs",
FsMagicEROFS: "erofs",
FsMagicExtfs: "extfs",
FsMagicF2fs: "f2fs",
FsMagicGPFS: "gpfs",
FsMagicJffs2Fs: "jffs2",
FsMagicJfs: "jfs",
FsMagicNfsFs: "nfs",
FsMagicOverlay: "overlayfs",
FsMagicRAMFs: "ramfs",
FsMagicReiserFs: "reiserfs",
FsMagicSmbFs: "smb",
FsMagicSquashFs: "squashfs",
FsMagicTmpFs: "tmpfs",
FsMagicUnsupported: "unsupported",
FsMagicVxFS: "vxfs",
FsMagicXfs: "xfs",
FsMagicZfs: "zfs",
}
)
// GetFSMagic returns the filesystem id given the path.
func GetFSMagic(rootpath string) (FsMagic, error) {
var buf unix.Statfs_t
path := filepath.Dir(rootpath)
if err := unix.Statfs(path, &buf); err != nil {
return 0, err
}
if _, ok := FsNames[FsMagic(buf.Type)]; !ok {
logrus.Debugf("Unknown filesystem type %#x reported for %s", buf.Type, path)
}
return FsMagic(buf.Type), nil
}
// NewFsChecker returns a checker configured for the provided FsMagic
func NewFsChecker(t FsMagic) Checker {
return &fsChecker{
t: t,
}
}
type fsChecker struct {
t FsMagic
}
func (c *fsChecker) IsMounted(path string) bool {
m, _ := Mounted(c.t, path)
return m
}
// NewDefaultChecker returns a check that parses /proc/mountinfo to check
// if the specified path is mounted.
func NewDefaultChecker() Checker {
return &defaultChecker{}
}
type defaultChecker struct{}
func (c *defaultChecker) IsMounted(path string) bool {
m, _ := mount.Mounted(path)
return m
}
// isMountPoint checks that the given path is a mount point
func isMountPoint(mountPath string) (bool, error) {
// it is already the root
if mountPath == "/" {
return true, nil
}
var s1, s2 unix.Stat_t
if err := unix.Stat(mountPath, &s1); err != nil {
return true, err
}
if err := unix.Stat(filepath.Dir(mountPath), &s2); err != nil {
return true, err
}
return s1.Dev != s2.Dev, nil
}
// Mounted checks if the given path is mounted as the fs type
func Mounted(fsType FsMagic, mountPath string) (bool, error) {
var buf unix.Statfs_t
if err := unix.Statfs(mountPath, &buf); err != nil {
return false, err
}
if FsMagic(buf.Type) != fsType {
return false, nil
}
return isMountPoint(mountPath)
}
|
