properly lock file.entry object

fix https://github.com/chrislusf/seaweedfs/issues/1882

weed/filesys/dir_link.go

@@ -35,15 +35,20 @@ func (dir *Dir) Link(ctx context.Context, req *fuse.LinkRequest, old fs.Node) (f
 		return nil, err
 	}
 
-	// update old file to hardlink mode
+	oldEntry := oldFile.getEntry()
-	if len(oldFile.entry.HardLinkId) == 0 {
+	if oldEntry == nil {
-		oldFile.entry.HardLinkId = append(util.RandomBytes(16), HARD_LINK_MARKER)
+		return nil, fuse.EIO
-		oldFile.entry.HardLinkCounter = 1
 	}
-	oldFile.entry.HardLinkCounter++
+
+	// update old file to hardlink mode
+	if len(oldEntry.HardLinkId) == 0 {
+		oldEntry.HardLinkId = append(util.RandomBytes(16), HARD_LINK_MARKER)
+		oldEntry.HardLinkCounter = 1
+	}
+	oldEntry.HardLinkCounter++
 	updateOldEntryRequest := &filer_pb.UpdateEntryRequest{
 		Directory:  oldFile.dir.FullPath(),
-		Entry:      oldFile.entry,
+		Entry:      oldEntry,
 		Signatures: []int32{dir.wfs.signature},
 	}
 
@@ -53,11 +58,11 @@ func (dir *Dir) Link(ctx context.Context, req *fuse.LinkRequest, old fs.Node) (f
 		Entry: &filer_pb.Entry{
 			Name:            req.NewName,
 			IsDirectory:     false,
-			Attributes:      oldFile.entry.Attributes,
+			Attributes:      oldEntry.Attributes,
-			Chunks:          oldFile.entry.Chunks,
+			Chunks:          oldEntry.Chunks,
-			Extended:        oldFile.entry.Extended,
+			Extended:        oldEntry.Extended,
-			HardLinkId:      oldFile.entry.HardLinkId,
+			HardLinkId:      oldEntry.HardLinkId,
-			HardLinkCounter: oldFile.entry.HardLinkCounter,
+			HardLinkCounter: oldEntry.HardLinkCounter,
 		},
 		Signatures: []int32{dir.wfs.signature},
 	}

weed/filesys/dirty_page.go

@@ -30,7 +30,7 @@ func newDirtyPages(file *File) *ContinuousDirtyPages {
 
 func (pages *ContinuousDirtyPages) AddPage(offset int64, data []byte) {
 
-	glog.V(4).Infof("%s AddPage [%d,%d) of %d bytes", pages.f.fullpath(), offset, offset+int64(len(data)), pages.f.entry.Attributes.FileSize)
+	glog.V(4).Infof("%s AddPage [%d,%d)", pages.f.fullpath(), offset, offset+int64(len(data)))
 
 	if len(data) > int(pages.f.wfs.option.ChunkSizeLimit) {
 		// this is more than what buffer can hold.
@@ -69,7 +69,12 @@ func (pages *ContinuousDirtyPages) saveExistingLargestPageToStorage() (hasSavedD
 		return false
 	}
 
-	fileSize := int64(pages.f.entry.Attributes.FileSize)
+	entry := pages.f.getEntry()
+	if entry == nil {
+		return false
+	}
+
+	fileSize := int64(entry.Attributes.FileSize)
 
 	chunkSize := min(maxList.Size(), fileSize-maxList.Offset())
 	if chunkSize == 0 {

weed/filesys/file.go

@@ -5,6 +5,7 @@ import (
 	"io"
 	"os"
 	"sort"
+	"sync"
 	"time"
 
 	"github.com/seaweedfs/fuse"
@@ -33,6 +34,7 @@ type File struct {
 	dir            *Dir
 	wfs            *WFS
 	entry          *filer_pb.Entry
+	entryLock      sync.RWMutex
 	entryViewCache []filer.VisibleInterval
 	isOpen         int
 	reader         io.ReaderAt
@@ -47,7 +49,7 @@ func (file *File) Attr(ctx context.Context, attr *fuse.Attr) (err error) {
 
 	glog.V(4).Infof("file Attr %s, open:%v existing:%v", file.fullpath(), file.isOpen, attr)
 
-	entry := file.entry
+	entry := file.getEntry()
 	if file.isOpen <= 0 || entry == nil {
 		if entry, err = file.maybeLoadEntry(ctx); err != nil {
 			return err
@@ -258,7 +260,7 @@ func (file *File) Forget() {
 }
 
 func (file *File) maybeLoadEntry(ctx context.Context) (entry *filer_pb.Entry, err error) {
-	entry = file.entry
+	entry = file.getEntry()
 	if file.isOpen > 0 {
 		return entry, nil
 	}
@@ -299,8 +301,13 @@ func (file *File) addChunks(chunks []*filer_pb.FileChunk) {
 		}
 	}
 
+	entry := file.getEntry()
+	if entry == nil {
+		return
+	}
+
 	// pick out-of-order chunks from existing chunks
-	for _, chunk := range file.entry.Chunks {
+	for _, chunk := range entry.Chunks {
 		if lessThan(earliestChunk, chunk) {
 			chunks = append(chunks, chunk)
 		}
@@ -318,18 +325,22 @@ func (file *File) addChunks(chunks []*filer_pb.FileChunk) {
 
 	file.reader = nil
 
-	glog.V(4).Infof("%s existing %d chunks adds %d more", file.fullpath(), len(file.entry.Chunks), len(chunks))
+	glog.V(4).Infof("%s existing %d chunks adds %d more", file.fullpath(), len(entry.Chunks), len(chunks))
 
-	file.entry.Chunks = append(file.entry.Chunks, newChunks...)
+	entry.Chunks = append(entry.Chunks, newChunks...)
 }
 
 func (file *File) setEntry(entry *filer_pb.Entry) {
+	file.entryLock.Lock()
+	defer file.entryLock.Unlock()
 	file.entry = entry
 	file.entryViewCache, _ = filer.NonOverlappingVisibleIntervals(file.wfs.LookupFn(), entry.Chunks)
 	file.reader = nil
 }
 
 func (file *File) clearEntry() {
+	file.entryLock.Lock()
+	defer file.entryLock.Unlock()
 	file.entry = nil
 	file.entryViewCache = nil
 	file.reader = nil
@@ -359,3 +370,9 @@ func (file *File) saveEntry(entry *filer_pb.Entry) error {
 		return nil
 	})
 }
+
+func (file *File) getEntry() *filer_pb.Entry {
+	file.entryLock.RLock()
+	defer file.entryLock.RUnlock()
+	return file.entry
+}

weed/filesys/filehandle.go

@@ -40,8 +40,9 @@ func newFileHandle(file *File, uid, gid uint32) *FileHandle {
 		Uid:        uid,
 		Gid:        gid,
 	}
-	if fh.f.entry != nil {
+	entry := fh.f.getEntry()
-		fh.f.entry.Attributes.FileSize = filer.FileSize(fh.f.entry)
+	if entry != nil {
+		entry.Attributes.FileSize = filer.FileSize(entry)
 	}
 
 	return fh
@@ -104,22 +105,27 @@ func (fh *FileHandle) readFromDirtyPages(buff []byte, startOffset int64) (maxSto
 
 func (fh *FileHandle) readFromChunks(buff []byte, offset int64) (int64, error) {
 
-	fileSize := int64(filer.FileSize(fh.f.entry))
+	entry := fh.f.getEntry()
+	if entry == nil {
+		return 0, io.EOF
+	}
+
+	fileSize := int64(filer.FileSize(entry))
 
 	if fileSize == 0 {
 		glog.V(1).Infof("empty fh %v", fh.f.fullpath())
 		return 0, io.EOF
 	}
 
-	if offset+int64(len(buff)) <= int64(len(fh.f.entry.Content)) {
+	if offset+int64(len(buff)) <= int64(len(entry.Content)) {
-		totalRead := copy(buff, fh.f.entry.Content[offset:])
+		totalRead := copy(buff, entry.Content[offset:])
 		glog.V(4).Infof("file handle read cached %s [%d,%d] %d", fh.f.fullpath(), offset, offset+int64(totalRead), totalRead)
 		return int64(totalRead), nil
 	}
 
 	var chunkResolveErr error
 	if fh.f.entryViewCache == nil {
-		fh.f.entryViewCache, chunkResolveErr = filer.NonOverlappingVisibleIntervals(fh.f.wfs.LookupFn(), fh.f.entry.Chunks)
+		fh.f.entryViewCache, chunkResolveErr = filer.NonOverlappingVisibleIntervals(fh.f.wfs.LookupFn(), entry.Chunks)
 		if chunkResolveErr != nil {
 			return 0, fmt.Errorf("fail to resolve chunk manifest: %v", chunkResolveErr)
 		}
@@ -158,8 +164,13 @@ func (fh *FileHandle) Write(ctx context.Context, req *fuse.WriteRequest, resp *f
 		copy(data, req.Data)
 	}
 
-	fh.f.entry.Content = nil
+	entry := fh.f.getEntry()
-	fh.f.entry.Attributes.FileSize = uint64(max(req.Offset+int64(len(data)), int64(fh.f.entry.Attributes.FileSize)))
+	if entry == nil {
+		return fuse.EIO
+	}
+
+	entry.Content = nil
+	entry.Attributes.FileSize = uint64(max(req.Offset+int64(len(data)), int64(entry.Attributes.FileSize)))
 	glog.V(4).Infof("%v write [%d,%d) %d", fh.f.fullpath(), req.Offset, req.Offset+int64(len(req.Data)), len(req.Data))
 
 	fh.dirtyPages.AddPage(req.Offset, data)
@@ -242,35 +253,40 @@ func (fh *FileHandle) doFlush(ctx context.Context, header fuse.Header) error {
 
 	err := fh.f.wfs.WithFilerClient(func(client filer_pb.SeaweedFilerClient) error {
 
-		if fh.f.entry.Attributes != nil {
+		entry := fh.f.getEntry()
-			fh.f.entry.Attributes.Mime = fh.contentType
+		if entry == nil {
-			if fh.f.entry.Attributes.Uid == 0 {
+			return nil
-				fh.f.entry.Attributes.Uid = header.Uid
+		}
+
+		if entry.Attributes != nil {
+			entry.Attributes.Mime = fh.contentType
+			if entry.Attributes.Uid == 0 {
+				entry.Attributes.Uid = header.Uid
 			}
-			if fh.f.entry.Attributes.Gid == 0 {
+			if entry.Attributes.Gid == 0 {
-				fh.f.entry.Attributes.Gid = header.Gid
+				entry.Attributes.Gid = header.Gid
 			}
-			if fh.f.entry.Attributes.Crtime == 0 {
+			if entry.Attributes.Crtime == 0 {
-				fh.f.entry.Attributes.Crtime = time.Now().Unix()
+				entry.Attributes.Crtime = time.Now().Unix()
 			}
-			fh.f.entry.Attributes.Mtime = time.Now().Unix()
+			entry.Attributes.Mtime = time.Now().Unix()
-			fh.f.entry.Attributes.FileMode = uint32(os.FileMode(fh.f.entry.Attributes.FileMode) &^ fh.f.wfs.option.Umask)
+			entry.Attributes.FileMode = uint32(os.FileMode(entry.Attributes.FileMode) &^ fh.f.wfs.option.Umask)
-			fh.f.entry.Attributes.Collection = fh.dirtyPages.collection
+			entry.Attributes.Collection = fh.dirtyPages.collection
-			fh.f.entry.Attributes.Replication = fh.dirtyPages.replication
+			entry.Attributes.Replication = fh.dirtyPages.replication
 		}
 
 		request := &filer_pb.CreateEntryRequest{
 			Directory:  fh.f.dir.FullPath(),
-			Entry:      fh.f.entry,
+			Entry:      entry,
 			Signatures: []int32{fh.f.wfs.signature},
 		}
 
-		glog.V(4).Infof("%s set chunks: %v", fh.f.fullpath(), len(fh.f.entry.Chunks))
+		glog.V(4).Infof("%s set chunks: %v", fh.f.fullpath(), len(entry.Chunks))
-		for i, chunk := range fh.f.entry.Chunks {
+		for i, chunk := range entry.Chunks {
 			glog.V(4).Infof("%s chunks %d: %v [%d,%d)", fh.f.fullpath(), i, chunk.GetFileIdString(), chunk.Offset, chunk.Offset+int64(chunk.Size))
 		}
 
-		manifestChunks, nonManifestChunks := filer.SeparateManifestChunks(fh.f.entry.Chunks)
+		manifestChunks, nonManifestChunks := filer.SeparateManifestChunks(entry.Chunks)
 
 		chunks, _ := filer.CompactFileChunks(fh.f.wfs.LookupFn(), nonManifestChunks)
 		chunks, manifestErr := filer.MaybeManifestize(fh.f.wfs.saveDataAsChunk(fh.f.fullpath()), chunks)
@@ -278,7 +294,7 @@ func (fh *FileHandle) doFlush(ctx context.Context, header fuse.Header) error {
 			// not good, but should be ok
 			glog.V(0).Infof("MaybeManifestize: %v", manifestErr)
 		}
-		fh.f.entry.Chunks = append(chunks, manifestChunks...)
+		entry.Chunks = append(chunks, manifestChunks...)
 
 		fh.f.wfs.mapPbIdFromLocalToFiler(request.Entry)
 		defer fh.f.wfs.mapPbIdFromFilerToLocal(request.Entry)

weed/filesys/fscache.go

@@ -124,8 +124,9 @@ func (c *FsCache) Move(oldPath util.FullPath, newPath util.FullPath) *FsNode {
 	}
 	if f, ok := src.node.(*File); ok {
 		f.Name = target.name
-		if f.entry != nil {
+		entry := f.getEntry()
-			f.entry.Name = f.Name
+		if entry != nil {
+			entry.Name = f.Name
 		}
 	}
 	parent.disconnectChild(target)