80 lines
2.9 KiB
Go
80 lines
2.9 KiB
Go
// Copyright 2018 Google LLC
|
|
//
|
|
// 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 dev
|
|
|
|
import (
|
|
"gvisor.googlesource.com/gvisor/pkg/abi/linux"
|
|
"gvisor.googlesource.com/gvisor/pkg/sentry/context"
|
|
"gvisor.googlesource.com/gvisor/pkg/sentry/fs"
|
|
"gvisor.googlesource.com/gvisor/pkg/sentry/fs/fsutil"
|
|
"gvisor.googlesource.com/gvisor/pkg/sentry/usermem"
|
|
"gvisor.googlesource.com/gvisor/pkg/syserror"
|
|
"gvisor.googlesource.com/gvisor/pkg/waiter"
|
|
)
|
|
|
|
// fullDevice is used to implement /dev/full.
|
|
//
|
|
// +stateify savable
|
|
type fullDevice struct {
|
|
fsutil.InodeGenericChecker `state:"nosave"`
|
|
fsutil.InodeNoExtendedAttributes `state:"nosave"`
|
|
fsutil.InodeNoopRelease `state:"nosave"`
|
|
fsutil.InodeNoopTruncate `state:"nosave"`
|
|
fsutil.InodeNoopWriteOut `state:"nosave"`
|
|
fsutil.InodeNotDirectory `state:"nosave"`
|
|
fsutil.InodeNotMappable `state:"nosave"`
|
|
fsutil.InodeNotSocket `state:"nosave"`
|
|
fsutil.InodeNotSymlink `state:"nosave"`
|
|
fsutil.InodeVirtual `state:"nosave"`
|
|
|
|
fsutil.InodeSimpleAttributes
|
|
}
|
|
|
|
var _ fs.InodeOperations = (*fullDevice)(nil)
|
|
|
|
func newFullDevice(ctx context.Context, owner fs.FileOwner, mode linux.FileMode) *fullDevice {
|
|
f := &fullDevice{
|
|
InodeSimpleAttributes: fsutil.NewInodeSimpleAttributes(ctx, owner, fs.FilePermsFromMode(mode), linux.TMPFS_MAGIC),
|
|
}
|
|
return f
|
|
}
|
|
|
|
// GetFile implements fs.InodeOperations.GetFile.
|
|
func (f *fullDevice) GetFile(ctx context.Context, dirent *fs.Dirent, flags fs.FileFlags) (*fs.File, error) {
|
|
flags.Pread = true
|
|
return fs.NewFile(ctx, dirent, flags, &fullFileOperations{}), nil
|
|
}
|
|
|
|
// +stateify savable
|
|
type fullFileOperations struct {
|
|
waiter.AlwaysReady `state:"nosave"`
|
|
fsutil.FileGenericSeek `state:"nosave"`
|
|
fsutil.FileNoIoctl `state:"nosave"`
|
|
fsutil.FileNoMMap `state:"nosave"`
|
|
fsutil.FileNoopFlush `state:"nosave"`
|
|
fsutil.FileNoopFsync `state:"nosave"`
|
|
fsutil.FileNoopRelease `state:"nosave"`
|
|
fsutil.FileNotDirReaddir `state:"nosave"`
|
|
fsutil.FileUseInodeUnstableAttr `state:"nosave"`
|
|
readZeros `state:"nosave"`
|
|
}
|
|
|
|
var _ fs.FileOperations = (*fullFileOperations)(nil)
|
|
|
|
// Write implements FileOperations.Write.
|
|
func (*fullFileOperations) Write(context.Context, *fs.File, usermem.IOSequence, int64) (int64, error) {
|
|
return 0, syserror.ENOSPC
|
|
}
|