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Support overlay2 on btrfs

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OverlayFS is supported on top of btrfs as of Linux Kernel 4.7.
Skip the hard enforcement when on kernel 4.7 or newer and
respect the kernel check override flag on older kernels.
https://btrfs.wiki.kernel.org/index.php/Changelog#By_feature

Signed-off-by: Derek McGowan <derek@mcgstyle.net>
This commit is contained in:
Derek McGowan 2017-05-18 15:26:03 -07:00
parent b5f4fc7162
commit f64a4ad008
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1 changed files with 11 additions and 1 deletions
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12
daemon/graphdriver/overlay2/overlay.go
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@ -150,9 +150,19 @@ func Init(home string, options []string, uidMaps, gidMaps []idtools.IDMap) (grap
// check if they are running over btrfs, aufs, zfs, overlay, or ecryptfs
switch fsMagic {
case graphdriver.FsMagicBtrfs, graphdriver.FsMagicAufs, graphdriver.FsMagicZfs, graphdriver.FsMagicOverlay, graphdriver.FsMagicEcryptfs:
case graphdriver.FsMagicAufs, graphdriver.FsMagicZfs, graphdriver.FsMagicOverlay, graphdriver.FsMagicEcryptfs:
logrus.Errorf("'overlay2' is not supported over %s", backingFs)
return nil, graphdriver.ErrIncompatibleFS
case graphdriver.FsMagicBtrfs:
// Support for OverlayFS on BTRFS was added in kernel 4.7
// See https://btrfs.wiki.kernel.org/index.php/Changelog
if kernel.CompareKernelVersion(*v, kernel.VersionInfo{Kernel: 4, Major: 7, Minor: 0}) < 0 {
if !opts.overrideKernelCheck {
logrus.Errorf("'overlay2' requires kernel 4.7 to use on %s", backingFs)
return nil, graphdriver.ErrIncompatibleFS
}
logrus.Warn("Using pre-4.7.0 kernel for overlay2 on btrfs, may require kernel update")
}
}
rootUID, rootGID, err := idtools.GetRootUIDGID(uidMaps, gidMaps)