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package filesys
import ( "context" "fmt" "math" "os" "sync" "time"
"github.com/chrislusf/seaweedfs/weed/glog" "github.com/chrislusf/seaweedfs/weed/pb/filer_pb" "github.com/chrislusf/seaweedfs/weed/util" "github.com/karlseguin/ccache" "github.com/seaweedfs/fuse" "github.com/seaweedfs/fuse/fs" "google.golang.org/grpc")
type Option struct { FilerGrpcAddress string FilerMountRootPath string Collection string Replication string TtlSec int32 ChunkSizeLimit int64 DataCenter string DirListingLimit int EntryCacheTtl time.Duration
MountUid uint32 MountGid uint32 MountMode os.FileMode}
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
fileIdsDeletionChan chan []string
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(1024 * 8).ItemsToPrune(100)), pathToHandleIndex: make(map[string]int), bufPool: sync.Pool{ New: func() interface{} { return make([]byte, option.ChunkSizeLimit) }, }, fileIdsDeletionChan: make(chan []string, 32), }
go wfs.loopProcessingDeletion()
return wfs}
func (wfs *WFS) Root() (fs.Node, error) { return &Dir{Path: wfs.option.FilerMountRootPath, wfs: wfs}, nil}
func (wfs *WFS) withFilerClient(fn func(filer_pb.SeaweedFilerClient) error) error {
return util.WithCachedGrpcClient(func(grpcConnection *grpc.ClientConn) error { client := filer_pb.NewSeaweedFilerClient(grpcConnection) return fn(client) }, wfs.option.FilerGrpcAddress)
}
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(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}
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