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// Copyright 2019 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 ext4 implements the ext4 filesystem.
package ext4
import (
"gvisor.googlesource.com/gvisor/pkg/sentry/context"
"gvisor.googlesource.com/gvisor/pkg/sentry/fs"
)
// filesystem implements fs.Filesystem for ext4.
//
// +stateify savable
type filesystem struct{}
func init() {
fs.RegisterFilesystem(&filesystem{})
}
// FilesystemName is the name under which the filesystem is registered.
// Name matches fs/ext4/super.c:ext4_fs_type.name.
const FilesystemName = "ext4"
// Name is the name of the file system.
func (*filesystem) Name() string {
return FilesystemName
}
// 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 properties of the filesystem.
//
// In Linux, ext4 returns FS_REQUIRES_DEV. See fs/ext4/super.c
func (*filesystem) Flags() fs.FilesystemFlags {
return fs.FilesystemRequiresDev
}
// Mount returns the root inode of the ext4 fs.
func (f *filesystem) Mount(ctx context.Context, device string, flags fs.MountSourceFlags, data string, cgroupsInt interface{}) (*fs.Inode, error) {
panic("unimplemented")
}
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