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// Copyright 2020 The gVisor Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// Package host supports file descriptors imported directly.
package host
import (
"gvisor.dev/gvisor/pkg/context"
"gvisor.dev/gvisor/pkg/errors/linuxerr"
"gvisor.dev/gvisor/pkg/sentry/fs"
)
// filesystem is a host filesystem.
//
// +stateify savable
type filesystem struct{}
func init() {
fs.RegisterFilesystem(&filesystem{})
}
// FilesystemName is the name under which the filesystem is registered.
const FilesystemName = "host"
// Name is the name of the filesystem.
func (*filesystem) Name() string {
return FilesystemName
}
// Mount returns an error. Mounting hostfs is not allowed.
func (*filesystem) Mount(ctx context.Context, device string, flags fs.MountSourceFlags, data string, dataObj interface{}) (*fs.Inode, error) {
return nil, linuxerr.EPERM
}
// AllowUserMount prohibits users from using mount(2) with this file system.
func (*filesystem) AllowUserMount() bool {
return false
}
// AllowUserList prohibits this filesystem to be listed in /proc/filesystems.
func (*filesystem) AllowUserList() bool {
return false
}
// Flags returns that there is nothing special about this file system.
func (*filesystem) Flags() fs.FilesystemFlags {
return 0
}
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