Skip parent directory creation in mount (#4310)

A POSIX filesystem does not implicitly create parent directories when
they do not exist. Directories must be explicitly created and
permissions be set.

This also fixes a bug where asynchronous operations would create a
file in the filer before the parent directory was created. If the
file was a symlink or another special type of file the directory
would inherit that type and become unusable in the mounted FS.

weed/mount/weedfs_dir_mkrm.go

@@ -3,14 +3,16 @@ package mount
 import (
 	"context"
 	"fmt"
-	"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"
 	"os"
 	"strings"
 	"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"
 )
 
 /** Create a directory
@@ -54,9 +56,10 @@ func (wfs *WFS) Mkdir(cancel <-chan struct{}, in *fuse.MkdirIn, name string, out
 		defer wfs.mapPbIdFromFilerToLocal(newEntry)
 
 		request := &filer_pb.CreateEntryRequest{
-			Directory:  string(dirFullPath),
-			Entry:      newEntry,
-			Signatures: []int32{wfs.signature},
+			Directory:                string(dirFullPath),
+			Entry:                    newEntry,
+			Signatures:               []int32{wfs.signature},
+			SkipCheckParentDirectory: true,
 		}
 
 		glog.V(1).Infof("mkdir: %v", request)