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// Copyright 2018 Google Inc.
//
// 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 (
"math"
"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/ramfs"
"gvisor.googlesource.com/gvisor/pkg/sentry/usermem"
"gvisor.googlesource.com/gvisor/pkg/syserror"
)
// fullDevice is used to implement /dev/full.
//
// +stateify savable
type fullDevice struct {
ramfs.Entry
}
func newFullDevice(ctx context.Context, owner fs.FileOwner, mode linux.FileMode) *fullDevice {
f := &fullDevice{}
f.InitEntry(ctx, owner, fs.FilePermsFromMode(mode))
return f
}
// DeprecatedPwritev implements fs.InodeOperations.DeprecatedPwritev by
// returining ENOSPC.
func (f *fullDevice) DeprecatedPwritev(_ context.Context, _ usermem.IOSequence, _ int64) (int64, error) {
return 0, syserror.ENOSPC
}
// DeprecatedPreadv implements fs.InodeOperations.DeprecatedPreadv.
func (f *fullDevice) DeprecatedPreadv(ctx context.Context, dst usermem.IOSequence, _ int64) (int64, error) {
return dst.ZeroOut(ctx, math.MaxInt64)
}
// Truncate should be simply ignored for character devices on linux.
func (f *fullDevice) Truncate(context.Context, *fs.Inode, int64) error {
return nil
}
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