150 lines
3.4 KiB
Go
150 lines
3.4 KiB
Go
// Copyright 2015 Google Inc. All Rights Reserved.
|
|
//
|
|
// 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 statfs
|
|
|
|
import (
|
|
"os"
|
|
"sync"
|
|
|
|
"golang.org/x/net/context"
|
|
|
|
"github.com/jacobsa/fuse"
|
|
"github.com/jacobsa/fuse/fuseops"
|
|
"github.com/jacobsa/fuse/fuseutil"
|
|
)
|
|
|
|
// A file system that allows orchestrating canned responses to statfs ops, for
|
|
// testng out OS-specific statfs behavior.
|
|
//
|
|
// The file system allows opening and writing to any name that is a child of
|
|
// the root inode, and keeps track of the most recent write size delivered by
|
|
// the kernel (in order to test statfs response block size effects on write
|
|
// size, if any).
|
|
//
|
|
// Safe for concurrent access.
|
|
type FS interface {
|
|
fuseutil.FileSystem
|
|
|
|
// Set the canned response to be used for future statfs ops.
|
|
SetStatFSResponse(r fuseops.StatFSOp)
|
|
|
|
// Return the size of the most recent write delivered by the kernel, or -1 if
|
|
// none.
|
|
MostRecentWriteSize() int
|
|
}
|
|
|
|
func New() (fs FS) {
|
|
fs = &statFS{
|
|
mostRecentWriteSize: -1,
|
|
}
|
|
|
|
return
|
|
}
|
|
|
|
const childInodeID = fuseops.RootInodeID + 1
|
|
|
|
type statFS struct {
|
|
fuseutil.NotImplementedFileSystem
|
|
|
|
mu sync.Mutex
|
|
cannedResponse fuseops.StatFSOp // GUARDED_BY(mu)
|
|
mostRecentWriteSize int // GUARDED_BY(mu)
|
|
}
|
|
|
|
////////////////////////////////////////////////////////////////////////
|
|
// Helpers
|
|
////////////////////////////////////////////////////////////////////////
|
|
|
|
func dirAttrs() fuseops.InodeAttributes {
|
|
return fuseops.InodeAttributes{
|
|
Mode: os.ModeDir | 0777,
|
|
}
|
|
}
|
|
|
|
func fileAttrs() fuseops.InodeAttributes {
|
|
return fuseops.InodeAttributes{
|
|
Mode: 0666,
|
|
}
|
|
}
|
|
|
|
////////////////////////////////////////////////////////////////////////
|
|
// Public interface
|
|
////////////////////////////////////////////////////////////////////////
|
|
|
|
// LOCKS_EXCLUDED(fs.mu)
|
|
func (fs *statFS) SetStatFSResponse(r fuseops.StatFSOp) {
|
|
fs.mu.Lock()
|
|
defer fs.mu.Unlock()
|
|
|
|
fs.cannedResponse = r
|
|
}
|
|
|
|
// LOCKS_EXCLUDED(fs.mu)
|
|
func (fs *statFS) MostRecentWriteSize() int {
|
|
fs.mu.Lock()
|
|
defer fs.mu.Unlock()
|
|
|
|
return fs.mostRecentWriteSize
|
|
}
|
|
|
|
////////////////////////////////////////////////////////////////////////
|
|
// FileSystem methods
|
|
////////////////////////////////////////////////////////////////////////
|
|
|
|
// LOCKS_EXCLUDED(fs.mu)
|
|
func (fs *statFS) StatFS(
|
|
ctx context.Context,
|
|
op *fuseops.StatFSOp) (err error) {
|
|
fs.mu.Lock()
|
|
defer fs.mu.Unlock()
|
|
|
|
*op = fs.cannedResponse
|
|
return
|
|
}
|
|
|
|
func (fs *statFS) GetInodeAttributes(
|
|
ctx context.Context,
|
|
op *fuseops.GetInodeAttributesOp) (err error) {
|
|
switch op.Inode {
|
|
case fuseops.RootInodeID:
|
|
op.Attributes = dirAttrs()
|
|
|
|
case childInodeID:
|
|
op.Attributes = fileAttrs()
|
|
|
|
default:
|
|
err = fuse.ENOENT
|
|
}
|
|
|
|
return
|
|
}
|
|
|
|
func (fs *statFS) OpenFile(
|
|
ctx context.Context,
|
|
op *fuseops.OpenFileOp) (err error) {
|
|
return
|
|
}
|
|
|
|
// LOCKS_EXCLUDED(fs.mu)
|
|
func (fs *statFS) WriteFile(
|
|
ctx context.Context,
|
|
op *fuseops.WriteFileOp) (err error) {
|
|
fs.mu.Lock()
|
|
defer fs.mu.Unlock()
|
|
|
|
fs.mostRecentWriteSize = len(op.Data)
|
|
return
|
|
}
|