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Disallow overlay/overlay2 on top of NFS

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From https://www.kernel.org/doc/Documentation/filesystems/overlayfs.txt:

> The lower filesystem can be any filesystem supported by Linux and does
> not need to be writable. The lower filesystem can even be another
> overlayfs. The upper filesystem will normally be writable and if it
> is it must support the creation of trusted.* extended attributes, and
> must provide valid d_type in readdir responses, so NFS is not suitable.

Signed-off-by: Sebastiaan van Stijn <github@gone.nl>
This commit is contained in:
Sebastiaan van Stijn 2017-11-13 23:24:23 +01:00
parent aea31ab242
commit 90dfb1d0cc
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GPG key ID: 76698F39D527CE8C
2 changed files with 2 additions and 2 deletions
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2
daemon/graphdriver/overlay/overlay.go
View file

@ -126,7 +126,7 @@ func Init(home string, options []string, uidMaps, gidMaps []idtools.IDMap) (grap
}
switch fsMagic {
case graphdriver.FsMagicAufs, graphdriver.FsMagicBtrfs, graphdriver.FsMagicOverlay, graphdriver.FsMagicZfs, graphdriver.FsMagicEcryptfs:
case graphdriver.FsMagicAufs, graphdriver.FsMagicBtrfs, graphdriver.FsMagicOverlay, graphdriver.FsMagicZfs, graphdriver.FsMagicEcryptfs, graphdriver.FsMagicNfsFs:
logrus.Errorf("'overlay' is not supported over %s", backingFs)
return nil, graphdriver.ErrIncompatibleFS
}

2
daemon/graphdriver/overlay2/overlay.go
View file

@ -151,7 +151,7 @@ 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.FsMagicAufs, graphdriver.FsMagicZfs, graphdriver.FsMagicOverlay, graphdriver.FsMagicEcryptfs:
case graphdriver.FsMagicAufs, graphdriver.FsMagicZfs, graphdriver.FsMagicOverlay, graphdriver.FsMagicEcryptfs, graphdriver.FsMagicNfsFs:
logrus.Errorf("'overlay2' is not supported over %s", backingFs)
return nil, graphdriver.ErrIncompatibleFS
case graphdriver.FsMagicBtrfs: