github.com/ojongerius/docker@v1.11.2/daemon/graphdriver/driver_linux.go (about)

     1  // +build linux
     2  
     3  package graphdriver
     4  
     5  import (
     6  	"path/filepath"
     7  	"syscall"
     8  )
     9  
    10  const (
    11  	// FsMagicAufs filesystem id for Aufs
    12  	FsMagicAufs = FsMagic(0x61756673)
    13  	// FsMagicBtrfs filesystem id for Btrfs
    14  	FsMagicBtrfs = FsMagic(0x9123683E)
    15  	// FsMagicCramfs filesystem id for Cramfs
    16  	FsMagicCramfs = FsMagic(0x28cd3d45)
    17  	// FsMagicExtfs filesystem id for Extfs
    18  	FsMagicExtfs = FsMagic(0x0000EF53)
    19  	// FsMagicF2fs filesystem id for F2fs
    20  	FsMagicF2fs = FsMagic(0xF2F52010)
    21  	// FsMagicGPFS filesystem id for GPFS
    22  	FsMagicGPFS = FsMagic(0x47504653)
    23  	// FsMagicJffs2Fs filesystem if for Jffs2Fs
    24  	FsMagicJffs2Fs = FsMagic(0x000072b6)
    25  	// FsMagicJfs filesystem id for Jfs
    26  	FsMagicJfs = FsMagic(0x3153464a)
    27  	// FsMagicNfsFs filesystem id for NfsFs
    28  	FsMagicNfsFs = FsMagic(0x00006969)
    29  	// FsMagicRAMFs filesystem id for RamFs
    30  	FsMagicRAMFs = FsMagic(0x858458f6)
    31  	// FsMagicReiserFs filesystem id for ReiserFs
    32  	FsMagicReiserFs = FsMagic(0x52654973)
    33  	// FsMagicSmbFs filesystem id for SmbFs
    34  	FsMagicSmbFs = FsMagic(0x0000517B)
    35  	// FsMagicSquashFs filesystem id for SquashFs
    36  	FsMagicSquashFs = FsMagic(0x73717368)
    37  	// FsMagicTmpFs filesystem id for TmpFs
    38  	FsMagicTmpFs = FsMagic(0x01021994)
    39  	// FsMagicVxFS filesystem id for VxFs
    40  	FsMagicVxFS = FsMagic(0xa501fcf5)
    41  	// FsMagicXfs filesystem id for Xfs
    42  	FsMagicXfs = FsMagic(0x58465342)
    43  	// FsMagicZfs filesystem id for Zfs
    44  	FsMagicZfs = FsMagic(0x2fc12fc1)
    45  	// FsMagicOverlay filesystem id for overlay
    46  	FsMagicOverlay = FsMagic(0x794C7630)
    47  )
    48  
    49  var (
    50  	// Slice of drivers that should be used in an order
    51  	priority = []string{
    52  		"aufs",
    53  		"btrfs",
    54  		"zfs",
    55  		"devicemapper",
    56  		"overlay",
    57  		"vfs",
    58  	}
    59  
    60  	// FsNames maps filesystem id to name of the filesystem.
    61  	FsNames = map[FsMagic]string{
    62  		FsMagicAufs:        "aufs",
    63  		FsMagicBtrfs:       "btrfs",
    64  		FsMagicCramfs:      "cramfs",
    65  		FsMagicExtfs:       "extfs",
    66  		FsMagicF2fs:        "f2fs",
    67  		FsMagicGPFS:        "gpfs",
    68  		FsMagicJffs2Fs:     "jffs2",
    69  		FsMagicJfs:         "jfs",
    70  		FsMagicNfsFs:       "nfs",
    71  		FsMagicRAMFs:       "ramfs",
    72  		FsMagicReiserFs:    "reiserfs",
    73  		FsMagicSmbFs:       "smb",
    74  		FsMagicSquashFs:    "squashfs",
    75  		FsMagicTmpFs:       "tmpfs",
    76  		FsMagicUnsupported: "unsupported",
    77  		FsMagicVxFS:        "vxfs",
    78  		FsMagicXfs:         "xfs",
    79  		FsMagicZfs:         "zfs",
    80  	}
    81  )
    82  
    83  // GetFSMagic returns the filesystem id given the path.
    84  func GetFSMagic(rootpath string) (FsMagic, error) {
    85  	var buf syscall.Statfs_t
    86  	if err := syscall.Statfs(filepath.Dir(rootpath), &buf); err != nil {
    87  		return 0, err
    88  	}
    89  	return FsMagic(buf.Type), nil
    90  }
    91  
    92  // Mounted checks if the given path is mounted as the fs type
    93  func Mounted(fsType FsMagic, mountPath string) (bool, error) {
    94  	var buf syscall.Statfs_t
    95  	if err := syscall.Statfs(mountPath, &buf); err != nil {
    96  		return false, err
    97  	}
    98  	return FsMagic(buf.Type) == fsType, nil
    99  }