package mount import ( "context" "syscall" "time" "github.com/hanwen/go-fuse/v2/fuse" "github.com/seaweedfs/seaweedfs/weed/filer" "github.com/seaweedfs/seaweedfs/weed/glog" "github.com/seaweedfs/seaweedfs/weed/pb/filer_pb" ) /* What is an inode? If the file is an hardlinked file: use the hardlink id as inode Otherwise: use the file path as inode When creating a link: use the original file inode */ /** Create a hard link to a file */ func (wfs *WFS) Link(cancel <-chan struct{}, in *fuse.LinkIn, name string, out *fuse.EntryOut) (code fuse.Status) { if wfs.IsOverQuota { return fuse.Status(syscall.ENOSPC) } if s := checkName(name); s != fuse.OK { return s } newParentPath, code := wfs.inodeToPath.GetPath(in.NodeId) if code != fuse.OK { return } oldEntryPath, code := wfs.inodeToPath.GetPath(in.Oldnodeid) if code != fuse.OK { return } oldParentPath, _ := oldEntryPath.DirAndName() oldEntry, status := wfs.maybeLoadEntry(oldEntryPath) if status != fuse.OK { return status } // update old file to hardlink mode if len(oldEntry.HardLinkId) == 0 { oldEntry.HardLinkId = filer.NewHardLinkId() oldEntry.HardLinkCounter = 1 } oldEntry.HardLinkCounter++ updateOldEntryRequest := &filer_pb.UpdateEntryRequest{ Directory: oldParentPath, Entry: oldEntry, Signatures: []int32{wfs.signature}, } // CreateLink 1.2 : update new file to hardlink mode oldEntry.Attributes.Mtime = time.Now().Unix() request := &filer_pb.CreateEntryRequest{ Directory: string(newParentPath), Entry: &filer_pb.Entry{ Name: name, IsDirectory: false, Attributes: oldEntry.Attributes, Chunks: oldEntry.GetChunks(), Extended: oldEntry.Extended, HardLinkId: oldEntry.HardLinkId, HardLinkCounter: oldEntry.HardLinkCounter, }, Signatures: []int32{wfs.signature}, SkipCheckParentDirectory: true, } // apply changes to the filer, and also apply to local metaCache err := wfs.WithFilerClient(false, func(client filer_pb.SeaweedFilerClient) error { wfs.mapPbIdFromLocalToFiler(request.Entry) defer wfs.mapPbIdFromFilerToLocal(request.Entry) if err := filer_pb.UpdateEntry(client, updateOldEntryRequest); err != nil { return err } wfs.metaCache.UpdateEntry(context.Background(), filer.FromPbEntry(updateOldEntryRequest.Directory, updateOldEntryRequest.Entry)) if err := filer_pb.CreateEntry(client, request); err != nil { return err } wfs.metaCache.InsertEntry(context.Background(), filer.FromPbEntry(request.Directory, request.Entry)) return nil }) newEntryPath := newParentPath.Child(name) if err != nil { glog.V(0).Infof("Link %v -> %s: %v", oldEntryPath, newEntryPath, err) return fuse.EIO } wfs.inodeToPath.AddPath(oldEntry.Attributes.Inode, newEntryPath) wfs.outputPbEntry(out, oldEntry.Attributes.Inode, request.Entry) return fuse.OK }