57 lines
2.1 KiB
Go
57 lines
2.1 KiB
Go
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// 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 tmpfs
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import (
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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/fsutil"
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"gvisor.googlesource.com/gvisor/pkg/sentry/memmap"
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"gvisor.googlesource.com/gvisor/pkg/sentry/usermem"
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"gvisor.googlesource.com/gvisor/pkg/waiter"
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)
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// regularFileOperations implements fs.FileOperations for a regular
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// tmpfs file.
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type regularFileOperations struct {
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waiter.AlwaysReady `state:"nosave"`
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fsutil.NoopRelease `state:"nosave"`
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fsutil.GenericSeek `state:"nosave"`
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fsutil.NotDirReaddir `state:"nosave"`
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fsutil.NoopFsync `state:"nosave"`
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fsutil.NoopFlush `state:"nosave"`
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fsutil.NoIoctl `state:"nosave"`
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// iops is the InodeOperations of a regular tmpfs file. It is
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// guaranteed to be the same as file.Dirent.Inode.InodeOperations,
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// see operations that take fs.File below.
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iops *fileInodeOperations
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}
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// Read implements fs.FileOperations.Read.
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func (r *regularFileOperations) Read(ctx context.Context, file *fs.File, dst usermem.IOSequence, offset int64) (int64, error) {
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return r.iops.read(ctx, dst, offset)
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}
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// Write implements fs.FileOperations.Write.
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func (r *regularFileOperations) Write(ctx context.Context, file *fs.File, src usermem.IOSequence, offset int64) (int64, error) {
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return r.iops.write(ctx, src, offset)
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}
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// ConfigureMMap implements fs.FileOperations.ConfigureMMap.
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func (r *regularFileOperations) ConfigureMMap(ctx context.Context, file *fs.File, opts *memmap.MMapOpts) error {
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return fsutil.GenericConfigureMMap(file, r.iops, opts)
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}
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