Fix dead lock (#5815)

* reduce locks to avoid dead lock

Flush->FlushData->uplloadPipeline.FluahAll
uploaderCount>0

goroutine 1 [sync.Cond.Wait, 71 minutes]:
sync.runtime_notifyListWait(0xc0007ae4d0, 0x0)
	/usr/local/go/src/runtime/sema.go:569 +0x159
sync.(*Cond).Wait(0xc001a59290?)
	/usr/local/go/src/sync/cond.go:70 +0x85
github.com/seaweedfs/seaweedfs/weed/mount/page_writer.(*UploadPipeline).waitForCurrentWritersToComplete(0xc0002ee4d0)
	/github/workspace/weed/mount/page_writer/upload_pipeline_lock.go:58 +0x32
github.com/seaweedfs/seaweedfs/weed/mount/page_writer.(*UploadPipeline).FlushAll(0xc0002ee4d0)
	/github/workspace/weed/mount/page_writer/upload_pipeline.go:151 +0x25
github.com/seaweedfs/seaweedfs/weed/mount.(*ChunkedDirtyPages).FlushData(0xc00087e840)
	/github/workspace/weed/mount/dirty_pages_chunked.go:54 +0x29
github.com/seaweedfs/seaweedfs/weed/mount.(*PageWriter).FlushData(...)
	/github/workspace/weed/mount/page_writer.go:50
github.com/seaweedfs/seaweedfs/weed/mount.(*WFS).doFlush(0xc0006ad600, 0xc00030d380, 0x0, 0x0)
	/github/workspace/weed/mount/weedfs_file_sync.go:101 +0x169
github.com/seaweedfs/seaweedfs/weed/mount.(*WFS).Flush(0xc0006ad600, 0xc001a594a8?, 0xc0004c1ca0)
	/github/workspace/weed/mount/weedfs_file_sync.go:59 +0x48
github.com/hanwen/go-fuse/v2/fuse.doFlush(0xc0000da870?, 0xc0004c1b08)

SaveContent -> MemChunk.RLock ->
	ChunkedDirtyPages.saveChunkedFileIntervalToStorage
	pages.fh.AddChunks([]*filer_pb.FileChunk{chunk})
		fh.entryLock.Lock()

sync.(*RWMutex).Lock(0x0?)
	/usr/local/go/src/sync/rwmutex.go:146 +0x31
github.com/seaweedfs/seaweedfs/weed/mount.(*FileHandle).AddChunks(0xc00030d380, {0xc00028bdc8, 0x1, 0x1})
	/github/workspace/weed/mount/filehandle.go:93 +0x45
github.com/seaweedfs/seaweedfs/weed/mount.(*ChunkedDirtyPages).saveChunkedFileIntervalToStorage(0xc00087e840, {0x2be7ac0, 0xc00018d9e0}, 0x0, 0x121, 0x17e3c624565ace45, 0x1?)
	/github/workspace/weed/mount/dirty_pages_chunked.go:80 +0x2d4
github.com/seaweedfs/seaweedfs/weed/mount/page_writer.(*MemChunk).SaveContent(0xc0008d9130, 0xc0008093e0)
	/github/workspace/weed/mount/page_writer/page_chunk_mem.go:115 +0x112
github.com/seaweedfs/seaweedfs/weed/mount/page_writer.(*UploadPipeline).moveToSealed.func1()
	/github/workspace/weed/mount/page_writer/upload_pipeline.go:187 +0x55
github.com/seaweedfs/seaweedfs/weed/util.(*LimitedConcurrentExecutor).Execute.func1()
	/github/workspace/weed/util/limited_executor.go:38 +0x62
created by github.com/seaweedfs/seaweedfs/weed/util.(*LimitedConcurrentExecutor).Execute in goroutine 1
	/github/workspace/weed/util/limited_executor.go:33 +0x97

On metadata update
fh.entryLock.Lock()
	fh.dirtyPages.Destroy()
		up.chunksLock.Lock => each sealed chunk.FreeReference => MemChunk.Lock

goroutine 134 [sync.RWMutex.Lock, 71 minutes]:
sync.runtime_SemacquireRWMutex(0xc0007c3558?, 0xea?, 0x3fb0800?)
	/usr/local/go/src/runtime/sema.go:87 +0x25
sync.(*RWMutex).Lock(0xc0007c35a8?)
	/usr/local/go/src/sync/rwmutex.go:151 +0x6a
github.com/seaweedfs/seaweedfs/weed/mount/page_writer.(*MemChunk).FreeResource(0xc0008d9130)
	/github/workspace/weed/mount/page_writer/page_chunk_mem.go:38 +0x2a
github.com/seaweedfs/seaweedfs/weed/mount/page_writer.(*SealedChunk).FreeReference(0xc00071cdb0, {0xc0006ba1a0, 0x20})
	/github/workspace/weed/mount/page_writer/upload_pipeline.go:38 +0xb7
github.com/seaweedfs/seaweedfs/weed/mount/page_writer.(*UploadPipeline).Shutdown(0xc0002ee4d0)
	/github/workspace/weed/mount/page_writer/upload_pipeline.go:220 +0x185
github.com/seaweedfs/seaweedfs/weed/mount.(*ChunkedDirtyPages).Destroy(0xc0008cea40?)
	/github/workspace/weed/mount/dirty_pages_chunked.go:87 +0x17
github.com/seaweedfs/seaweedfs/weed/mount.(*PageWriter).Destroy(...)
	/github/workspace/weed/mount/page_writer.go:78
github.com/seaweedfs/seaweedfs/weed/mount.NewSeaweedFileSystem.func3({0xc00069a6c0, 0x30}, 0x6?)
	/github/workspace/weed/mount/weedfs.go:119 +0x17a
github.com/seaweedfs/seaweedfs/weed/mount/meta_cache.NewMetaCache.func1({0xc00069a6c0?, 0xc00069a480?}, 0x4015b40?)
	/github/workspace/weed/mount/meta_cache/meta_cache.go:37 +0x1c
github.com/seaweedfs/seaweedfs/weed/mount/meta_cache.SubscribeMetaEvents.func1(0xc000661810)
	/github/workspace/weed/mount/meta_cache/meta_cache_subscribe.go:43 +0x570

* use locked entry everywhere

* modifiable remote entry

* skip locking after getting lock from fhLockTable

1 files changed, 5 insertions, 9 deletions

diff --git a/weed/mount/filehandle_read.go b/weed/mount/filehandle_read.go
index 7b2629c13..3c315b1c4 100644
--- a/weed/mount/filehandle_read.go
+++ b/weed/mount/filehandle_read.go
@@ -29,23 +29,19 @@ func (fh *FileHandle) readFromChunks(buff []byte, offset int64) (int64, int64, e
 	fileFullPath := fh.FullPath()
 
 	entry := fh.GetEntry()
-	if entry == nil {
-		return 0, 0, io.EOF
-	}
 
 	if entry.IsInRemoteOnly() {
 		glog.V(4).Infof("download remote entry %s", fileFullPath)
-		newEntry, err := fh.downloadRemoteEntry(entry)
+		err := fh.downloadRemoteEntry(entry)
 		if err != nil {
 			glog.V(1).Infof("download remote entry %s: %v", fileFullPath, err)
 			return 0, 0, err
 		}
-		entry = newEntry
 	}
 
 	fileSize := int64(entry.Attributes.FileSize)
 	if fileSize == 0 {
-		fileSize = int64(filer.FileSize(entry))
+		fileSize = int64(filer.FileSize(entry.GetEntry()))
 	}
 
 	if fileSize == 0 {
@@ -70,7 +66,7 @@ func (fh *FileHandle) readFromChunks(buff []byte, offset int64) (int64, int64, e
 	return int64(totalRead), ts, err
 }
 
-func (fh *FileHandle) downloadRemoteEntry(entry *filer_pb.Entry) (*filer_pb.Entry, error) {
+func (fh *FileHandle) downloadRemoteEntry(entry *LockedEntry) (error) {
 
 	fileFullPath := fh.FullPath()
 	dir, _ := fileFullPath.DirAndName()
@@ -88,12 +84,12 @@ func (fh *FileHandle) downloadRemoteEntry(entry *filer_pb.Entry) (*filer_pb.Entr
 			return fmt.Errorf("CacheRemoteObjectToLocalCluster file %s: %v", fileFullPath, err)
 		}
 
-		entry = resp.Entry
+		entry.SetEntry(resp.Entry)
 
 		fh.wfs.metaCache.InsertEntry(context.Background(), filer.FromPbEntry(request.Directory, resp.Entry))
 
 		return nil
 	})
 
-	return entry, err
+	return err
 }