Mount concurrent read (#4400)

* fix:mount deadlock

* feat: concurrent read

* fix

* Remove useless code

* fix

---------

Co-authored-by: zemul <zhouzemiao@ihuman.com>

weed/mount/filehandle.go

@@ -17,7 +17,7 @@ type FileHandle struct {
 	fh              FileHandleId
 	counter         int64
 	entry           *LockedEntry
-	entryLock       sync.Mutex
+	entryLock       sync.RWMutex
 	entryChunkGroup *filer.ChunkGroup
 	inode           uint64
 	wfs             *WFS
@@ -28,7 +28,7 @@ type FileHandle struct {
 	reader        *filer.ChunkReadAt
 	contentType   string
 	handle        uint64
-	sync.Mutex
+	sync.RWMutex
 
 	isDeleted bool
 
@@ -103,6 +103,9 @@ func (fh *FileHandle) AddChunks(chunks []*filer_pb.FileChunk) {
 }
 
 func (fh *FileHandle) ReleaseHandle() {
+	fh.Lock()
+	defer fh.Unlock()
+
 	fh.entryLock.Lock()
 	defer fh.entryLock.Unlock()
 

weed/mount/filehandle_read.go

@@ -23,8 +23,8 @@ func (fh *FileHandle) readFromDirtyPages(buff []byte, startOffset int64, tsNs in
 }
 
 func (fh *FileHandle) readFromChunks(buff []byte, offset int64) (int64, int64, error) {
-	fh.entryLock.Lock()
-	defer fh.entryLock.Unlock()
+	fh.entryLock.RLock()
+	defer fh.entryLock.RUnlock()
 
 	fileFullPath := fh.FullPath()
 

weed/mount/weedfs_dir_lookup.go

@@ -58,12 +58,12 @@ func (wfs *WFS) Lookup(cancel <-chan struct{}, header *fuse.InHeader, name strin
 	inode := wfs.inodeToPath.Lookup(fullFilePath, localEntry.Crtime.Unix(), localEntry.IsDirectory(), len(localEntry.HardLinkId) > 0, localEntry.Inode, true)
 
 	if fh, found := wfs.fhmap.FindFileHandle(inode); found {
-		fh.entryLock.Lock()
+		fh.entryLock.RLock()
 		if entry := fh.GetEntry(); entry != nil {
 			glog.V(4).Infof("lookup opened file %s size %d", dirPath.Child(localEntry.Name()), filer.FileSize(entry))
 			localEntry = filer.FromPbEntry(string(dirPath), entry)
 		}
-		fh.entryLock.Unlock()
+		fh.entryLock.RUnlock()
 	}
 
 	wfs.outputFilerEntry(out, inode, localEntry)

weed/mount/weedfs_file_lseek.go

@@ -35,10 +35,10 @@ func (wfs *WFS) Lseek(cancel <-chan struct{}, in *fuse.LseekIn, out *fuse.LseekO
 	}
 
 	// lock the file until the proper offset was calculated
-	fh.Lock()
-	defer fh.Unlock()
-	fh.entryLock.Lock()
-	defer fh.entryLock.Unlock()
+	fh.RLock()
+	defer fh.RUnlock()
+	fh.entryLock.RLock()
+	defer fh.entryLock.RUnlock()
 
 	fileSize := int64(filer.FileSize(fh.GetEntry()))
 	offset := max(int64(in.Offset), 0)

weed/mount/weedfs_file_read.go

@@ -41,8 +41,8 @@ func (wfs *WFS) Read(cancel <-chan struct{}, in *fuse.ReadIn, buff []byte) (fuse
 		return nil, fuse.ENOENT
 	}
 
-	fh.Lock()
-	defer fh.Unlock()
+	fh.RLock()
+	defer fh.RUnlock()
 
 	offset := int64(in.Offset)
 	totalRead, err := readDataByFileHandle(buff, fh, offset)