From a92087f0f8fe82ce99414ec99ffe33e514cb21f6 Mon Sep 17 00:00:00 2001 From: Jamie Liu Date: Tue, 25 Feb 2020 19:12:22 -0800 Subject: Add VFS.NewDisconnectedMount(). Analogous to Linux's kern_mount(). PiperOrigin-RevId: 297259580 --- pkg/sentry/vfs/mount.go | 17 +++++++++++++++++ 1 file changed, 17 insertions(+) (limited to 'pkg/sentry/vfs/mount.go') diff --git a/pkg/sentry/vfs/mount.go b/pkg/sentry/vfs/mount.go index 9912df799..31a4e5480 100644 --- a/pkg/sentry/vfs/mount.go +++ b/pkg/sentry/vfs/mount.go @@ -139,6 +139,23 @@ func (vfs *VirtualFilesystem) NewMountNamespace(ctx context.Context, creds *auth return mntns, nil } +// NewDisconnectedMount returns a Mount representing fs with the given root +// (which may be nil). The new Mount is not associated with any MountNamespace +// and is not connected to any other Mounts. References are taken on fs and +// root. +func (vfs *VirtualFilesystem) NewDisconnectedMount(fs *Filesystem, root *Dentry, opts *MountOptions) (*Mount, error) { + fs.IncRef() + if root != nil { + root.IncRef() + } + return &Mount{ + vfs: vfs, + fs: fs, + root: root, + refs: 1, + }, nil +} + // MountAt creates and mounts a Filesystem configured by the given arguments. func (vfs *VirtualFilesystem) MountAt(ctx context.Context, creds *auth.Credentials, source string, target *PathOperation, fsTypeName string, opts *MountOptions) error { rft := vfs.getFilesystemType(fsTypeName) -- cgit v1.2.3