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Merge pull request #33281 from dmcgowan/overlay2-on-btrfs

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Support overlay2 on btrfs
This commit is contained in:
Sebastiaan van Stijn 2017-05-19 03:09:39 +02:00 committed by GitHub
commit 01af41ed99
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)