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  1. package filesys
  2. import (
  3. "context"
  4. "fmt"
  5. "math"
  6. "os"
  7. "path"
  8. "sync"
  9. "time"
  10. "google.golang.org/grpc"
  11. "github.com/chrislusf/seaweedfs/weed/util/grace"
  12. "github.com/seaweedfs/fuse"
  13. "github.com/seaweedfs/fuse/fs"
  14. "github.com/chrislusf/seaweedfs/weed/filesys/meta_cache"
  15. "github.com/chrislusf/seaweedfs/weed/glog"
  16. "github.com/chrislusf/seaweedfs/weed/pb/filer_pb"
  17. "github.com/chrislusf/seaweedfs/weed/util"
  18. "github.com/chrislusf/seaweedfs/weed/util/chunk_cache"
  19. )
  20. type Option struct {
  21. FilerGrpcAddress string
  22. GrpcDialOption grpc.DialOption
  23. FilerMountRootPath string
  24. Collection string
  25. Replication string
  26. TtlSec int32
  27. ChunkSizeLimit int64
  28. CacheDir string
  29. CacheSizeMB int64
  30. DataCenter string
  31. DirListCacheLimit int64
  32. EntryCacheTtl time.Duration
  33. Umask os.FileMode
  34. MountUid uint32
  35. MountGid uint32
  36. MountMode os.FileMode
  37. MountCtime time.Time
  38. MountMtime time.Time
  39. OutsideContainerClusterMode bool // whether the mount runs outside SeaweedFS containers
  40. Cipher bool // whether encrypt data on volume server
  41. }
  42. var _ = fs.FS(&WFS{})
  43. var _ = fs.FSStatfser(&WFS{})
  44. type WFS struct {
  45. option *Option
  46. // contains all open handles, protected by handlesLock
  47. handlesLock sync.Mutex
  48. handles map[uint64]*FileHandle
  49. bufPool sync.Pool
  50. stats statsCache
  51. root fs.Node
  52. fsNodeCache *FsCache
  53. chunkCache *chunk_cache.ChunkCache
  54. metaCache *meta_cache.MetaCache
  55. }
  56. type statsCache struct {
  57. filer_pb.StatisticsResponse
  58. lastChecked int64 // unix time in seconds
  59. }
  60. func NewSeaweedFileSystem(option *Option) *WFS {
  61. wfs := &WFS{
  62. option: option,
  63. handles: make(map[uint64]*FileHandle),
  64. bufPool: sync.Pool{
  65. New: func() interface{} {
  66. return make([]byte, option.ChunkSizeLimit)
  67. },
  68. },
  69. }
  70. cacheUniqueId := util.Md5([]byte(option.FilerGrpcAddress + option.FilerMountRootPath + util.Version()))[0:4]
  71. cacheDir := path.Join(option.CacheDir, cacheUniqueId)
  72. if option.CacheSizeMB > 0 {
  73. os.MkdirAll(cacheDir, 0755)
  74. wfs.chunkCache = chunk_cache.NewChunkCache(256, cacheDir, option.CacheSizeMB)
  75. grace.OnInterrupt(func() {
  76. wfs.chunkCache.Shutdown()
  77. })
  78. }
  79. wfs.metaCache = meta_cache.NewMetaCache(path.Join(cacheDir, "meta"))
  80. startTime := time.Now()
  81. go meta_cache.SubscribeMetaEvents(wfs.metaCache, wfs, wfs.option.FilerMountRootPath, startTime.UnixNano())
  82. grace.OnInterrupt(func() {
  83. wfs.metaCache.Shutdown()
  84. })
  85. wfs.root = &Dir{name: wfs.option.FilerMountRootPath, wfs: wfs}
  86. wfs.fsNodeCache = newFsCache(wfs.root)
  87. return wfs
  88. }
  89. func (wfs *WFS) Root() (fs.Node, error) {
  90. return wfs.root, nil
  91. }
  92. func (wfs *WFS) AcquireHandle(file *File, uid, gid uint32) (fileHandle *FileHandle) {
  93. fullpath := file.fullpath()
  94. glog.V(4).Infof("%s AcquireHandle uid=%d gid=%d", fullpath, uid, gid)
  95. wfs.handlesLock.Lock()
  96. defer wfs.handlesLock.Unlock()
  97. inodeId := file.fullpath().AsInode()
  98. existingHandle, found := wfs.handles[inodeId]
  99. if found && existingHandle != nil {
  100. return existingHandle
  101. }
  102. fileHandle = newFileHandle(file, uid, gid)
  103. wfs.handles[inodeId] = fileHandle
  104. fileHandle.handle = inodeId
  105. glog.V(4).Infof("%s new fh %d", fullpath, fileHandle.handle)
  106. return
  107. }
  108. func (wfs *WFS) ReleaseHandle(fullpath util.FullPath, handleId fuse.HandleID) {
  109. wfs.handlesLock.Lock()
  110. defer wfs.handlesLock.Unlock()
  111. glog.V(4).Infof("%s ReleaseHandle id %d current handles length %d", fullpath, handleId, len(wfs.handles))
  112. delete(wfs.handles, fullpath.AsInode())
  113. return
  114. }
  115. // Statfs is called to obtain file system metadata. Implements fuse.FSStatfser
  116. func (wfs *WFS) Statfs(ctx context.Context, req *fuse.StatfsRequest, resp *fuse.StatfsResponse) error {
  117. glog.V(4).Infof("reading fs stats: %+v", req)
  118. if wfs.stats.lastChecked < time.Now().Unix()-20 {
  119. err := wfs.WithFilerClient(func(client filer_pb.SeaweedFilerClient) error {
  120. request := &filer_pb.StatisticsRequest{
  121. Collection: wfs.option.Collection,
  122. Replication: wfs.option.Replication,
  123. Ttl: fmt.Sprintf("%ds", wfs.option.TtlSec),
  124. }
  125. glog.V(4).Infof("reading filer stats: %+v", request)
  126. resp, err := client.Statistics(context.Background(), request)
  127. if err != nil {
  128. glog.V(0).Infof("reading filer stats %v: %v", request, err)
  129. return err
  130. }
  131. glog.V(4).Infof("read filer stats: %+v", resp)
  132. wfs.stats.TotalSize = resp.TotalSize
  133. wfs.stats.UsedSize = resp.UsedSize
  134. wfs.stats.FileCount = resp.FileCount
  135. wfs.stats.lastChecked = time.Now().Unix()
  136. return nil
  137. })
  138. if err != nil {
  139. glog.V(0).Infof("filer Statistics: %v", err)
  140. return err
  141. }
  142. }
  143. totalDiskSize := wfs.stats.TotalSize
  144. usedDiskSize := wfs.stats.UsedSize
  145. actualFileCount := wfs.stats.FileCount
  146. // Compute the total number of available blocks
  147. resp.Blocks = totalDiskSize / blockSize
  148. // Compute the number of used blocks
  149. numBlocks := uint64(usedDiskSize / blockSize)
  150. // Report the number of free and available blocks for the block size
  151. resp.Bfree = resp.Blocks - numBlocks
  152. resp.Bavail = resp.Blocks - numBlocks
  153. resp.Bsize = uint32(blockSize)
  154. // Report the total number of possible files in the file system (and those free)
  155. resp.Files = math.MaxInt64
  156. resp.Ffree = math.MaxInt64 - actualFileCount
  157. // Report the maximum length of a name and the minimum fragment size
  158. resp.Namelen = 1024
  159. resp.Frsize = uint32(blockSize)
  160. return nil
  161. }