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Allow creation of new FS objects from outside the vfs package.

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PiperOrigin-RevId: 469649194
This commit is contained in:
Rahat Mahmood
2022-08-24 00:01:40 -07:00
committed by gVisor bot
parent 006ba84955
commit 00e0718041
1 changed files with 17 additions and 8 deletions
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pkg/sentry/vfs/mount.go
+17 -8
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@@ -174,6 +174,22 @@ func (vfs *VirtualFilesystem) NewMountNamespace(ctx context.Context, creds *auth
return mntns, nil
}
// NewFilesystem creates a new filesystem object not yet associated with any
// mounts. It can be installed into the filesystem tree with ConnectMountAt.
// Note that only the filesystem-specific mount options from opts are used by
// this function, mount flags are ignored. To set mount flags, pass them to a
// corresponding ConnectMountAt.
func (vfs *VirtualFilesystem) NewFilesystem(ctx context.Context, creds *auth.Credentials, source, fsTypeName string, opts *MountOptions) (*Filesystem, *Dentry, error) {
rft := vfs.getFilesystemType(fsTypeName)
if rft == nil {
return nil, nil, linuxerr.ENODEV
}
if !opts.InternalMount && !rft.opts.AllowUserMount {
return nil, nil, linuxerr.ENODEV
}
return rft.fsType.GetFilesystem(ctx, vfs, creds, source, opts.GetFilesystemOptions)
}
// 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
@@ -190,14 +206,7 @@ func (vfs *VirtualFilesystem) NewDisconnectedMount(fs *Filesystem, root *Dentry,
// then returns a Mount representing it. The new Mount is not associated with
// any MountNamespace and is not connected to any other Mounts.
func (vfs *VirtualFilesystem) MountDisconnected(ctx context.Context, creds *auth.Credentials, source string, fsTypeName string, opts *MountOptions) (*Mount, error) {
rft := vfs.getFilesystemType(fsTypeName)
if rft == nil {
return nil, linuxerr.ENODEV
}
if !opts.InternalMount && !rft.opts.AllowUserMount {
return nil, linuxerr.ENODEV
}
fs, root, err := rft.fsType.GetFilesystem(ctx, vfs, creds, source, opts.GetFilesystemOptions)
fs, root, err := vfs.NewFilesystem(ctx, creds, source, fsTypeName, opts)
if err != nil {
return nil, err
}