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package filesys
import ( "context" "fmt" "math" "os" "strings" "sync" "time"
"github.com/karlseguin/ccache" "google.golang.org/grpc"
"github.com/chrislusf/seaweedfs/weed/glog" "github.com/chrislusf/seaweedfs/weed/pb" "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 DirListCacheLimit int64 EntryCacheTtl time.Duration Umask os.FileMode
MountUid uint32 MountGid uint32 MountMode os.FileMode MountCtime time.Time MountMtime time.Time
OutsideContainerClusterMode bool // whether the mount runs outside SeaweedFS containers
Cipher bool // whether encrypt data on volume server
}
var _ = fs.FS(&WFS{})var _ = fs.FSStatfser(&WFS{})
type WFS struct { option *Option listDirectoryEntriesCache *ccache.Cache
// contains all open handles, protected by handlesLock
handlesLock sync.Mutex handles []*FileHandle pathToHandleIndex map[util.FullPath]int
bufPool sync.Pool
stats statsCache
// nodes, protected by nodesLock
nodesLock sync.Mutex nodes map[uint64]fs.Node root fs.Node fsNodeCache *FsCache}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.DirListCacheLimit * 3).ItemsToPrune(100)), pathToHandleIndex: make(map[util.FullPath]int), bufPool: sync.Pool{ New: func() interface{} { return make([]byte, option.ChunkSizeLimit) }, }, nodes: make(map[uint64]fs.Node), }
wfs.root = &Dir{Path: wfs.option.FilerMountRootPath, wfs: wfs} wfs.fsNodeCache = newFsCache(wfs.root)
return wfs}
func (wfs *WFS) Root() (fs.Node, error) { return wfs.root, nil}
func (wfs *WFS) WithFilerClient(fn func(filer_pb.SeaweedFilerClient) error) error {
err := pb.WithCachedGrpcClient(func(grpcConnection *grpc.ClientConn) error { client := filer_pb.NewSeaweedFilerClient(grpcConnection) return fn(client) }, wfs.option.FilerGrpcAddress, wfs.option.GrpcDialOption)
if err == nil { return nil } return err
}
func (wfs *WFS) AcquireHandle(file *File, uid, gid uint32) (fileHandle *FileHandle) {
fullpath := file.fullpath() glog.V(4).Infof("%s AcquireHandle uid=%d gid=%d", fullpath, uid, gid)
wfs.handlesLock.Lock() defer wfs.handlesLock.Unlock()
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).Infof("%s reuse fh %d", fullpath, fileHandle.handle) return } }
wfs.handles = append(wfs.handles, fileHandle) fileHandle.handle = uint64(len(wfs.handles) - 1) wfs.pathToHandleIndex[fullpath] = int(fileHandle.handle) glog.V(4).Infof("%s new fh %d", fullpath, fileHandle.handle)
return}
func (wfs *WFS) ReleaseHandle(fullpath util.FullPath, handleId fuse.HandleID) { wfs.handlesLock.Lock() defer wfs.handlesLock.Unlock()
glog.V(4).Infof("%s ReleaseHandle 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(context.Background(), 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}
func (wfs *WFS) cacheGet(path util.FullPath) *filer_pb.Entry { item := wfs.listDirectoryEntriesCache.Get(string(path)) if item != nil && !item.Expired() { return item.Value().(*filer_pb.Entry) } return nil}func (wfs *WFS) cacheSet(path util.FullPath, entry *filer_pb.Entry, ttl time.Duration) { if entry == nil { wfs.listDirectoryEntriesCache.Delete(string(path)) } else { wfs.listDirectoryEntriesCache.Set(string(path), entry, ttl) }}func (wfs *WFS) cacheDelete(path util.FullPath) { wfs.listDirectoryEntriesCache.Delete(string(path))}
func (wfs *WFS) AdjustedUrl(hostAndPort string) string { if !wfs.option.OutsideContainerClusterMode { return hostAndPort } commaIndex := strings.Index(hostAndPort, ":") if commaIndex < 0 { return hostAndPort } filerCommaIndex := strings.Index(wfs.option.FilerGrpcAddress, ":") return fmt.Sprintf("%s:%s", wfs.option.FilerGrpcAddress[:filerCommaIndex], hostAndPort[commaIndex+1:])
}
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