1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
|
// Copyright 2018 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 tmpfs
import (
"gvisor.dev/gvisor/pkg/context"
"gvisor.dev/gvisor/pkg/sentry/fs"
"gvisor.dev/gvisor/pkg/sentry/fs/fsutil"
"gvisor.dev/gvisor/pkg/sentry/memmap"
"gvisor.dev/gvisor/pkg/usermem"
"gvisor.dev/gvisor/pkg/waiter"
)
// regularFileOperations implements fs.FileOperations for a regular
// tmpfs file.
//
// +stateify savable
type regularFileOperations struct {
fsutil.FileNoopRelease `state:"nosave"`
fsutil.FileGenericSeek `state:"nosave"`
fsutil.FileNotDirReaddir `state:"nosave"`
fsutil.FileNoopFsync `state:"nosave"`
fsutil.FileNoopFlush `state:"nosave"`
fsutil.FileNoIoctl `state:"nosave"`
fsutil.FileNoSplice `state:"nosave"`
fsutil.FileUseInodeUnstableAttr `state:"nosave"`
waiter.AlwaysReady `state:"nosave"`
// iops is the InodeOperations of a regular tmpfs file. It is
// guaranteed to be the same as file.Dirent.Inode.InodeOperations,
// see operations that take fs.File below.
iops *fileInodeOperations
}
// Read implements fs.FileOperations.Read.
func (r *regularFileOperations) Read(ctx context.Context, file *fs.File, dst usermem.IOSequence, offset int64) (int64, error) {
return r.iops.read(ctx, file, dst, offset)
}
// Write implements fs.FileOperations.Write.
func (r *regularFileOperations) Write(ctx context.Context, file *fs.File, src usermem.IOSequence, offset int64) (int64, error) {
return r.iops.write(ctx, src, offset)
}
// ConfigureMMap implements fs.FileOperations.ConfigureMMap.
func (r *regularFileOperations) ConfigureMMap(ctx context.Context, file *fs.File, opts *memmap.MMapOpts) error {
return fsutil.GenericConfigureMMap(file, r.iops, opts)
}
|
