vfs: use atomic types

vfs/file.go

@@ -37,7 +37,7 @@ import (
 // File represents a file
 type File struct {
 	inode uint64       // inode number - read only
-	size  int64  // size of file - read and written with atomic int64 - must be 64 bit aligned
+	size  atomic.Int64 // size of file
 
 	muRW sync.Mutex // synchronize RWFileHandle.openPending(), RWFileHandle.close() and File.Remove
 
@@ -51,7 +51,7 @@ type File struct {
 	pendingModTime   time.Time                       // will be applied once o becomes available, i.e. after file was written
 	pendingRenameFun func(ctx context.Context) error // will be run/renamed after all writers close
 	sys              atomic.Value                    // user defined info to be attached here
-	nwriters         int32                           // len(writers) which is read/updated with atomic
+	nwriters         atomic.Int32                    // len(writers)
 	appendMode       bool                            // file was opened with O_APPEND
 }
 
@@ -67,7 +67,7 @@ func newFile(d *Dir, dPath string, o fs.Object, leaf string) *File {
 		inode: newInode(),
 	}
 	if o != nil {
-		f.size = o.Size()
+		f.size.Store(o.Size())
 	}
 	return f
 }
@@ -266,7 +266,7 @@ func (f *File) rename(ctx context.Context, destDir *Dir, newName string) error {
 func (f *File) addWriter(h Handle) {
 	f.mu.Lock()
 	f.writers = append(f.writers, h)
-	atomic.AddInt32(&f.nwriters, 1)
+	f.nwriters.Add(1)
 	f.mu.Unlock()
 }
 
@@ -284,7 +284,7 @@ func (f *File) delWriter(h Handle) {
 	}
 	if found >= 0 {
 		f.writers = append(f.writers[:found], f.writers[found+1:]...)
-		atomic.AddInt32(&f.nwriters, -1)
+		f.nwriters.Add(-1)
 	} else {
 		fs.Debugf(f._path(), "File.delWriter couldn't find handle")
 	}
@@ -295,7 +295,7 @@ func (f *File) delWriter(h Handle) {
 // Note that we don't take the mutex here.  If we do then we can get a
 // deadlock.
 func (f *File) activeWriters() int {
-	return int(atomic.LoadInt32(&f.nwriters))
+	return int(f.nwriters.Load())
 }
 
 // _roundModTime rounds the time passed in to the Precision of the
@@ -383,7 +383,7 @@ func (f *File) Size() int64 {
 
 	// if o is nil it isn't valid yet or there are writers, so return the size so far
 	if f._writingInProgress() {
-		return atomic.LoadInt64(&f.size)
+		return f.size.Load()
 	}
 	return nonNegative(f.o.Size())
 }
@@ -473,7 +473,7 @@ func (f *File) writingInProgress() bool {
 
 // Update the size while writing
 func (f *File) setSize(n int64) {
-	atomic.StoreInt64(&f.size, n)
+	f.size.Store(n)
 }
 
 // Update the object when written and add it to the directory

vfs/read.go

@@ -223,7 +223,7 @@ func waitSequential(what string, remote string, cond *sync.Cond, maxWait time.Du
 	var (
 		timeout = time.NewTimer(maxWait)
 		done    = make(chan struct{})
-		abort   = int32(0)
+		abort   atomic.Int32
 	)
 	go func() {
 		select {
@@ -232,14 +232,14 @@ func waitSequential(what string, remote string, cond *sync.Cond, maxWait time.Du
 			// cond.Broadcast. NB cond.L == mu
 			cond.L.Lock()
 			// set abort flag and give all the waiting goroutines a kick on timeout
-			atomic.StoreInt32(&abort, 1)
+			abort.Store(1)
 			fs.Debugf(remote, "aborting in-sequence %s wait, off=%d", what, off)
 			cond.Broadcast()
 			cond.L.Unlock()
 		case <-done:
 		}
 	}()
-	for *poff != off && atomic.LoadInt32(&abort) == 0 {
+	for *poff != off && abort.Load() == 0 {
 		fs.Debugf(remote, "waiting for in-sequence %s to %d for %v", what, off, maxWait)
 		cond.Wait()
 	}

vfs/test_vfs/test_vfs.go

@@ -26,7 +26,7 @@ var (
 	number     = flag.Int("n", 4, "Number of tests to run simultaneously")
 	iterations = flag.Int("i", 100, "Iterations of the test")
 	timeout    = flag.Duration("timeout", 10*time.Second, "Inactivity time to detect a deadlock")
-	testNumber int32
+	testNumber atomic.Int32
 )
 
 // Seed the random number generator
@@ -55,7 +55,7 @@ func NewTest(Dir string) *Test {
 		dir:    Dir,
 		name:   random.String(*nameLength),
 		isDir:  rand.Intn(2) == 0,
-		number: atomic.AddInt32(&testNumber, 1),
+		number: testNumber.Add(1),
 		timer:  time.NewTimer(*timeout),
 	}
 	width := int(math.Floor(math.Log10(float64(*number)))) + 1

vfs/vfs.go

@@ -167,7 +167,7 @@ type VFS struct {
 	usageTime   time.Time
 	usage       *fs.Usage
 	pollChan    chan time.Duration
-	inUse       int32 // count of number of opens accessed with atomic
+	inUse       atomic.Int32 // count of number of opens
 }
 
 // Keep track of active VFS keyed on fs.ConfigString(f)
@@ -182,8 +182,8 @@ func New(f fs.Fs, opt *vfscommon.Options) *VFS {
 	fsDir := fs.NewDir("", time.Now())
 	vfs := &VFS{
 		f: f,
-		inUse: int32(1),
 	}
+	vfs.inUse.Store(1)
 
 	// Make a copy of the options
 	if opt != nil {
@@ -202,7 +202,7 @@ func New(f fs.Fs, opt *vfscommon.Options) *VFS {
 	for _, activeVFS := range active[configName] {
 		if vfs.Opt == activeVFS.Opt {
 			fs.Debugf(f, "Re-using VFS from active cache")
-			atomic.AddInt32(&activeVFS.inUse, 1)
+			activeVFS.inUse.Add(1)
 			return activeVFS
 		}
 	}
@@ -243,7 +243,7 @@ func (vfs *VFS) Stats() (out rc.Params) {
 	out = make(rc.Params)
 	out["fs"] = fs.ConfigString(vfs.f)
 	out["opt"] = vfs.Opt
-	out["inUse"] = atomic.LoadInt32(&vfs.inUse)
+	out["inUse"] = vfs.inUse.Load()
 
 	var (
 		dirs  int
@@ -313,7 +313,7 @@ func (vfs *VFS) shutdownCache() {
 // Shutdown stops any background go-routines and removes the VFS from
 // the active ache.
 func (vfs *VFS) Shutdown() {
-	if atomic.AddInt32(&vfs.inUse, -1) > 0 {
+	if vfs.inUse.Add(-1) > 0 {
 		return
 	}
 
@@ -386,11 +386,11 @@ func (vfs *VFS) Root() (*Dir, error) {
 	return vfs.root, nil
 }
 
-var inodeCount uint64
+var inodeCount atomic.Uint64
 
 // newInode creates a new unique inode number
 func newInode() (inode uint64) {
-	return atomic.AddUint64(&inodeCount, 1)
+	return inodeCount.Add(1)
 }
 
 // Stat finds the Node by path starting from the root