1 files changed, 0 insertions, 191 deletions
diff --git a/pkg/sentry/fsimpl/devtmpfs/devtmpfs.go b/pkg/sentry/fsimpl/devtmpfs/devtmpfs.go
deleted file mode 100644
index abd4f24e7..000000000
--- a/pkg/sentry/fsimpl/devtmpfs/devtmpfs.go
+++ /dev/null
@@ -1,191 +0,0 @@
-// 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 devtmpfs provides an implementation of /dev based on tmpfs,
-// analogous to Linux's devtmpfs.
-package devtmpfs
-
-import (
-	"fmt"
-
-	"gvisor.dev/gvisor/pkg/abi/linux"
-	"gvisor.dev/gvisor/pkg/context"
-	"gvisor.dev/gvisor/pkg/fspath"
-	"gvisor.dev/gvisor/pkg/sentry/fsimpl/tmpfs"
-	"gvisor.dev/gvisor/pkg/sentry/kernel/auth"
-	"gvisor.dev/gvisor/pkg/sentry/vfs"
-	"gvisor.dev/gvisor/pkg/sync"
-)
-
-// Name is the default filesystem name.
-const Name = "devtmpfs"
-
-// FilesystemType implements vfs.FilesystemType.
-type FilesystemType struct {
-	initOnce sync.Once
-	initErr  error
-
-	// fs is the tmpfs filesystem that backs all mounts of this FilesystemType.
-	// root is fs' root. fs and root are immutable.
-	fs   *vfs.Filesystem
-	root *vfs.Dentry
-}
-
-// GetFilesystem implements vfs.FilesystemType.GetFilesystem.
-func (fst *FilesystemType) GetFilesystem(ctx context.Context, vfsObj *vfs.VirtualFilesystem, creds *auth.Credentials, source string, opts vfs.GetFilesystemOptions) (*vfs.Filesystem, *vfs.Dentry, error) {
-	fst.initOnce.Do(func() {
-		fs, root, err := tmpfs.FilesystemType{}.GetFilesystem(ctx, vfsObj, creds, "" /* source */, vfs.GetFilesystemOptions{
-			Data: "mode=0755", // opts from drivers/base/devtmpfs.c:devtmpfs_init()
-		})
-		if err != nil {
-			fst.initErr = err
-			return
-		}
-		fst.fs = fs
-		fst.root = root
-	})
-	if fst.initErr != nil {
-		return nil, nil, fst.initErr
-	}
-	fst.fs.IncRef()
-	fst.root.IncRef()
-	return fst.fs, fst.root, nil
-}
-
-// Accessor allows devices to create device special files in devtmpfs.
-type Accessor struct {
-	vfsObj *vfs.VirtualFilesystem
-	mntns  *vfs.MountNamespace
-	root   vfs.VirtualDentry
-	creds  *auth.Credentials
-}
-
-// NewAccessor returns an Accessor that supports creation of device special
-// files in the devtmpfs instance registered with name fsTypeName in vfsObj.
-func NewAccessor(ctx context.Context, vfsObj *vfs.VirtualFilesystem, creds *auth.Credentials, fsTypeName string) (*Accessor, error) {
-	mntns, err := vfsObj.NewMountNamespace(ctx, creds, "devtmpfs" /* source */, fsTypeName, &vfs.GetFilesystemOptions{})
-	if err != nil {
-		return nil, err
-	}
-	return &Accessor{
-		vfsObj: vfsObj,
-		mntns:  mntns,
-		root:   mntns.Root(),
-		creds:  creds,
-	}, nil
-}
-
-// Release must be called when a is no longer in use.
-func (a *Accessor) Release() {
-	a.root.DecRef()
-	a.mntns.DecRef()
-}
-
-// accessorContext implements context.Context by extending an existing
-// context.Context with an Accessor's values for VFS-relevant state.
-type accessorContext struct {
-	context.Context
-	a *Accessor
-}
-
-func (a *Accessor) wrapContext(ctx context.Context) *accessorContext {
-	return &accessorContext{
-		Context: ctx,
-		a:       a,
-	}
-}
-
-// Value implements context.Context.Value.
-func (ac *accessorContext) Value(key interface{}) interface{} {
-	switch key {
-	case vfs.CtxMountNamespace:
-		ac.a.mntns.IncRef()
-		return ac.a.mntns
-	case vfs.CtxRoot:
-		ac.a.root.IncRef()
-		return ac.a.root
-	default:
-		return ac.Context.Value(key)
-	}
-}
-
-func (a *Accessor) pathOperationAt(pathname string) *vfs.PathOperation {
-	return &vfs.PathOperation{
-		Root:  a.root,
-		Start: a.root,
-		Path:  fspath.Parse(pathname),
-	}
-}
-
-// CreateDeviceFile creates a device special file at the given pathname in the
-// devtmpfs instance accessed by the Accessor.
-func (a *Accessor) CreateDeviceFile(ctx context.Context, pathname string, kind vfs.DeviceKind, major, minor uint32, perms uint16) error {
-	mode := (linux.FileMode)(perms)
-	switch kind {
-	case vfs.BlockDevice:
-		mode |= linux.S_IFBLK
-	case vfs.CharDevice:
-		mode |= linux.S_IFCHR
-	default:
-		panic(fmt.Sprintf("invalid vfs.DeviceKind: %v", kind))
-	}
-	// NOTE: Linux's devtmpfs refuses to automatically delete files it didn't
-	// create, which it recognizes by storing a pointer to the kdevtmpfs struct
-	// thread in struct inode::i_private. Accessor doesn't yet support deletion
-	// of files at all, and probably won't as long as we don't need to support
-	// kernel modules, so this is moot for now.
-	return a.vfsObj.MknodAt(a.wrapContext(ctx), a.creds, a.pathOperationAt(pathname), &vfs.MknodOptions{
-		Mode:     mode,
-		DevMajor: major,
-		DevMinor: minor,
-	})
-}
-
-// UserspaceInit creates symbolic links and mount points in the devtmpfs
-// instance accessed by the Accessor that are created by userspace in Linux. It
-// does not create mounts.
-func (a *Accessor) UserspaceInit(ctx context.Context) error {
-	actx := a.wrapContext(ctx)
-
-	// systemd: src/shared/dev-setup.c:dev_setup()
-	for _, symlink := range []struct {
-		source string
-		target string
-	}{
-		// /proc/kcore is not implemented.
-		{source: "fd", target: "/proc/self/fd"},
-		{source: "stdin", target: "/proc/self/fd/0"},
-		{source: "stdout", target: "/proc/self/fd/1"},
-		{source: "stderr", target: "/proc/self/fd/2"},
-	} {
-		if err := a.vfsObj.SymlinkAt(actx, a.creds, a.pathOperationAt(symlink.source), symlink.target); err != nil {
-			return fmt.Errorf("failed to create symlink %q => %q: %v", symlink.source, symlink.target, err)
-		}
-	}
-
-	// systemd: src/core/mount-setup.c:mount_table
-	for _, dir := range []string{
-		"shm",
-		"pts",
-	} {
-		if err := a.vfsObj.MkdirAt(actx, a.creds, a.pathOperationAt(dir), &vfs.MkdirOptions{
-			// systemd: src/core/mount-setup.c:mount_one()
-			Mode: 0755,
-		}); err != nil {
-			return fmt.Errorf("failed to create directory %q: %v", dir, err)
-		}
-	}
-
-	return nil
-}