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package filesys
import ( "context" "fmt" "github.com/chrislusf/seaweedfs/weed/filer" "github.com/chrislusf/seaweedfs/weed/storage/types" "github.com/chrislusf/seaweedfs/weed/wdclient" "math" "os" "path" "sync" "time"
"google.golang.org/grpc"
"github.com/chrislusf/seaweedfs/weed/util/grace"
"github.com/seaweedfs/fuse" "github.com/seaweedfs/fuse/fs"
"github.com/chrislusf/seaweedfs/weed/filesys/meta_cache" "github.com/chrislusf/seaweedfs/weed/glog" "github.com/chrislusf/seaweedfs/weed/pb/filer_pb" "github.com/chrislusf/seaweedfs/weed/util" "github.com/chrislusf/seaweedfs/weed/util/chunk_cache" )
type Option struct { MountDirectory string FilerAddress string FilerGrpcAddress string GrpcDialOption grpc.DialOption FilerMountRootPath string Collection string Replication string TtlSec int32 DiskType types.DiskType ChunkSizeLimit int64 ConcurrentWriters int CacheDir string CacheSizeMB int64 DataCenter string Umask os.FileMode
MountUid uint32 MountGid uint32 MountMode os.FileMode MountCtime time.Time MountMtime time.Time
VolumeServerAccess string // how to access volume servers
Cipher bool // whether encrypt data on volume server
UidGidMapper *meta_cache.UidGidMapper }
var _ = fs.FS(&WFS{}) var _ = fs.FSStatfser(&WFS{})
type WFS struct { option *Option
// contains all open handles, protected by handlesLock
handlesLock sync.Mutex handles map[uint64]*FileHandle
bufPool sync.Pool
stats statsCache
root fs.Node fsNodeCache *FsCache
chunkCache *chunk_cache.TieredChunkCache metaCache *meta_cache.MetaCache signature int32
// throttle writers
concurrentWriters *util.LimitedConcurrentExecutor Server *fs.Server } type statsCache struct { filer_pb.StatisticsResponse lastChecked int64 // unix time in seconds
}
func NewSeaweedFileSystem(option *Option) *WFS { wfs := &WFS{ option: option, handles: make(map[uint64]*FileHandle), bufPool: sync.Pool{ New: func() interface{} { return make([]byte, option.ChunkSizeLimit) }, }, signature: util.RandomInt32(), } cacheUniqueId := util.Md5String([]byte(option.MountDirectory + option.FilerGrpcAddress + option.FilerMountRootPath + util.Version()))[0:8] cacheDir := path.Join(option.CacheDir, cacheUniqueId) if option.CacheSizeMB > 0 { os.MkdirAll(cacheDir, os.FileMode(0777)&^option.Umask) wfs.chunkCache = chunk_cache.NewTieredChunkCache(256, cacheDir, option.CacheSizeMB, 1024*1024) }
wfs.metaCache = meta_cache.NewMetaCache(path.Join(cacheDir, "meta"), util.FullPath(option.FilerMountRootPath), option.UidGidMapper, func(filePath util.FullPath) {
fsNode := NodeWithId(filePath.AsInode()) if err := wfs.Server.InvalidateNodeData(fsNode); err != nil { glog.V(4).Infof("InvalidateNodeData %s : %v", filePath, err) }
dir, name := filePath.DirAndName() parent := NodeWithId(util.FullPath(dir).AsInode()) if dir == option.FilerMountRootPath { parent = NodeWithId(1) } if err := wfs.Server.InvalidateEntry(parent, name); err != nil { glog.V(4).Infof("InvalidateEntry %s : %v", filePath, err) } }) startTime := time.Now() go meta_cache.SubscribeMetaEvents(wfs.metaCache, wfs.signature, wfs, wfs.option.FilerMountRootPath, startTime.UnixNano()) grace.OnInterrupt(func() { wfs.metaCache.Shutdown() })
wfs.root = &Dir{name: wfs.option.FilerMountRootPath, wfs: wfs, id: 1} wfs.fsNodeCache = newFsCache(wfs.root)
if wfs.option.ConcurrentWriters > 0 { wfs.concurrentWriters = util.NewLimitedConcurrentExecutor(wfs.option.ConcurrentWriters) }
return wfs }
func (wfs *WFS) Root() (fs.Node, error) { return wfs.root, nil }
func (wfs *WFS) AcquireHandle(file *File, uid, gid uint32, writeOnly bool) (fileHandle *FileHandle) {
fullpath := file.fullpath() glog.V(4).Infof("AcquireHandle %s uid=%d gid=%d", fullpath, uid, gid)
inodeId := file.Id()
wfs.handlesLock.Lock() existingHandle, found := wfs.handles[inodeId] wfs.handlesLock.Unlock() if found && existingHandle != nil { existingHandle.f.isOpen++ if existingHandle.writeOnly { existingHandle.writeOnly = writeOnly } glog.V(4).Infof("Acquired Handle %s open %d", fullpath, existingHandle.f.isOpen) return existingHandle }
entry, _ := file.maybeLoadEntry(context.Background()) file.entry = entry fileHandle = newFileHandle(file, uid, gid) fileHandle.writeOnly = writeOnly file.isOpen++
wfs.handlesLock.Lock() wfs.handles[inodeId] = fileHandle wfs.handlesLock.Unlock() fileHandle.handle = inodeId
glog.V(4).Infof("Acquired new Handle %s open %d", fullpath, file.isOpen) return }
func (wfs *WFS) ReleaseHandle(fullpath util.FullPath, handleId fuse.HandleID) { wfs.handlesLock.Lock() defer wfs.handlesLock.Unlock()
glog.V(4).Infof("ReleaseHandle %s id %d current handles length %d", fullpath, handleId, len(wfs.handles))
delete(wfs.handles, uint64(handleId))
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), DiskType: string(wfs.option.DiskType), }
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) mapPbIdFromFilerToLocal(entry *filer_pb.Entry) { if entry.Attributes == nil { return } entry.Attributes.Uid, entry.Attributes.Gid = wfs.option.UidGidMapper.FilerToLocal(entry.Attributes.Uid, entry.Attributes.Gid) } func (wfs *WFS) mapPbIdFromLocalToFiler(entry *filer_pb.Entry) { if entry.Attributes == nil { return } entry.Attributes.Uid, entry.Attributes.Gid = wfs.option.UidGidMapper.LocalToFiler(entry.Attributes.Uid, entry.Attributes.Gid) }
func (wfs *WFS) LookupFn() wdclient.LookupFileIdFunctionType { if wfs.option.VolumeServerAccess == "filerProxy" { return func(fileId string) (targetUrls []string, err error) { return []string{"http://" + wfs.option.FilerAddress + "/?proxyChunkId=" + fileId}, nil } } return filer.LookupFn(wfs)
}
type NodeWithId uint64
func (n NodeWithId) Id() uint64 { return uint64(n) } func (n NodeWithId) Attr(ctx context.Context, attr *fuse.Attr) error { return nil }
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