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