package filesys import ( "context" "fmt" "math" "os" "sync" "time" "github.com/karlseguin/ccache" "google.golang.org/grpc" "github.com/chrislusf/seaweedfs/weed/glog" "github.com/chrislusf/seaweedfs/weed/pb/filer_pb" "github.com/chrislusf/seaweedfs/weed/util" "github.com/seaweedfs/fuse" "github.com/seaweedfs/fuse/fs" ) type Option struct { FilerGrpcAddress string GrpcDialOption grpc.DialOption FilerMountRootPath string Collection string Replication string TtlSec int32 ChunkSizeLimit int64 DataCenter string DirListingLimit int64 EntryCacheTtl time.Duration Umask os.FileMode MountUid uint32 MountGid uint32 MountMode os.FileMode MountCtime time.Time MountMtime time.Time } var _ = fs.FS(&WFS{}) var _ = fs.FSStatfser(&WFS{}) type WFS struct { option *Option listDirectoryEntriesCache *ccache.Cache // contains all open handles handles []*FileHandle pathToHandleIndex map[string]int pathToHandleLock sync.Mutex bufPool sync.Pool stats statsCache } type statsCache struct { filer_pb.StatisticsResponse lastChecked int64 // unix time in seconds } func NewSeaweedFileSystem(option *Option) *WFS { wfs := &WFS{ option: option, listDirectoryEntriesCache: ccache.New(ccache.Configure().MaxSize(option.DirListingLimit * 3).ItemsToPrune(100)), pathToHandleIndex: make(map[string]int), bufPool: sync.Pool{ New: func() interface{} { return make([]byte, option.ChunkSizeLimit) }, }, } return wfs } func (wfs *WFS) Root() (fs.Node, error) { return &Dir{Path: wfs.option.FilerMountRootPath, wfs: wfs}, nil } func (wfs *WFS) WithFilerClient(ctx context.Context, fn func(filer_pb.SeaweedFilerClient) error) error { return util.WithCachedGrpcClient(ctx, func(grpcConnection *grpc.ClientConn) error { client := filer_pb.NewSeaweedFilerClient(grpcConnection) return fn(client) }, wfs.option.FilerGrpcAddress, wfs.option.GrpcDialOption) } func (wfs *WFS) AcquireHandle(file *File, uid, gid uint32) (fileHandle *FileHandle) { wfs.pathToHandleLock.Lock() defer wfs.pathToHandleLock.Unlock() fullpath := file.fullpath() index, found := wfs.pathToHandleIndex[fullpath] if found && wfs.handles[index] != nil { glog.V(2).Infoln(fullpath, "found fileHandle id", index) return wfs.handles[index] } fileHandle = newFileHandle(file, uid, gid) for i, h := range wfs.handles { if h == nil { wfs.handles[i] = fileHandle fileHandle.handle = uint64(i) wfs.pathToHandleIndex[fullpath] = i glog.V(4).Infoln(fullpath, "reuse fileHandle id", fileHandle.handle) return } } wfs.handles = append(wfs.handles, fileHandle) fileHandle.handle = uint64(len(wfs.handles) - 1) glog.V(2).Infoln(fullpath, "new fileHandle id", fileHandle.handle) wfs.pathToHandleIndex[fullpath] = int(fileHandle.handle) return } func (wfs *WFS) ReleaseHandle(fullpath string, handleId fuse.HandleID) { wfs.pathToHandleLock.Lock() defer wfs.pathToHandleLock.Unlock() glog.V(4).Infof("%s releasing handle id %d current handles length %d", fullpath, handleId, len(wfs.handles)) delete(wfs.pathToHandleIndex, fullpath) if int(handleId) < len(wfs.handles) { wfs.handles[int(handleId)] = nil } return } // Statfs is called to obtain file system metadata. Implements fuse.FSStatfser func (wfs *WFS) Statfs(ctx context.Context, req *fuse.StatfsRequest, resp *fuse.StatfsResponse) error { glog.V(4).Infof("reading fs stats: %+v", req) if wfs.stats.lastChecked < time.Now().Unix()-20 { err := wfs.WithFilerClient(ctx, func(client filer_pb.SeaweedFilerClient) error { request := &filer_pb.StatisticsRequest{ Collection: wfs.option.Collection, Replication: wfs.option.Replication, Ttl: fmt.Sprintf("%ds", wfs.option.TtlSec), } glog.V(4).Infof("reading filer stats: %+v", request) resp, err := client.Statistics(ctx, request) if err != nil { glog.V(0).Infof("reading filer stats %v: %v", request, err) return err } glog.V(4).Infof("read filer stats: %+v", resp) wfs.stats.TotalSize = resp.TotalSize wfs.stats.UsedSize = resp.UsedSize wfs.stats.FileCount = resp.FileCount wfs.stats.lastChecked = time.Now().Unix() return nil }) if err != nil { glog.V(0).Infof("filer Statistics: %v", err) return err } } totalDiskSize := wfs.stats.TotalSize usedDiskSize := wfs.stats.UsedSize actualFileCount := wfs.stats.FileCount // Compute the total number of available blocks resp.Blocks = totalDiskSize / blockSize // Compute the number of used blocks numBlocks := uint64(usedDiskSize / blockSize) // Report the number of free and available blocks for the block size resp.Bfree = resp.Blocks - numBlocks resp.Bavail = resp.Blocks - numBlocks resp.Bsize = uint32(blockSize) // Report the total number of possible files in the file system (and those free) resp.Files = math.MaxInt64 resp.Ffree = math.MaxInt64 - actualFileCount // Report the maximum length of a name and the minimum fragment size resp.Namelen = 1024 resp.Frsize = uint32(blockSize) return nil }