54 lines
1.8 KiB
Go
54 lines
1.8 KiB
Go
// Copyright 2018 Google Inc.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package dev
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import (
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"math"
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"gvisor.googlesource.com/gvisor/pkg/abi/linux"
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"gvisor.googlesource.com/gvisor/pkg/sentry/context"
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"gvisor.googlesource.com/gvisor/pkg/sentry/fs"
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"gvisor.googlesource.com/gvisor/pkg/sentry/fs/ramfs"
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"gvisor.googlesource.com/gvisor/pkg/sentry/usermem"
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"gvisor.googlesource.com/gvisor/pkg/syserror"
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)
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// fullDevice is used to implement /dev/full.
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type fullDevice struct {
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ramfs.Entry
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}
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func newFullDevice(ctx context.Context, owner fs.FileOwner, mode linux.FileMode) *fullDevice {
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f := &fullDevice{}
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f.InitEntry(ctx, owner, fs.FilePermsFromMode(mode))
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return f
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}
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// DeprecatedPwritev implements fs.InodeOperations.DeprecatedPwritev by
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// returining ENOSPC.
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func (f *fullDevice) DeprecatedPwritev(_ context.Context, _ usermem.IOSequence, _ int64) (int64, error) {
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return 0, syserror.ENOSPC
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}
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// DeprecatedPreadv implements fs.InodeOperations.DeprecatedPreadv.
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func (f *fullDevice) DeprecatedPreadv(ctx context.Context, dst usermem.IOSequence, _ int64) (int64, error) {
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return dst.ZeroOut(ctx, math.MaxInt64)
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}
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// Truncate should be simply ignored for character devices on linux.
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func (f *fullDevice) Truncate(context.Context, *fs.Inode, int64) error {
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return nil
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}
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