remove the direct_io flag, as it is not well-supported on macOS

weed/command/mount_std.go

@@ -248,6 +248,7 @@ func RunMount(option *MountOptions, umask os.FileMode) bool {
 		Cipher:             cipher,
 		UidGidMapper:       uidGidMapper,
 		DisableXAttr:       *option.disableXAttr,
+		IsMacOs:            runtime.GOOS == "darwin",
 	})
 
 	// create mount root

weed/mount/weedfs.go

@@ -46,6 +46,7 @@ type Option struct {
 	Umask              os.FileMode
 	Quota              int64
 	DisableXAttr       bool
+	IsMacOs            bool
 
 	MountUid         uint32
 	MountGid         uint32

weed/mount/weedfs_file_io.go

@@ -2,6 +2,7 @@ package mount
 
 import (
 	"github.com/hanwen/go-fuse/v2/fuse"
+	"github.com/seaweedfs/seaweedfs/weed/glog"
 )
 
 /**
@@ -66,6 +67,14 @@ func (wfs *WFS) Open(cancel <-chan struct{}, in *fuse.OpenIn, out *fuse.OpenOut)
 	if status == fuse.OK {
 		out.Fh = uint64(fileHandle.fh)
 		out.OpenFlags = in.Flags
+		if wfs.option.IsMacOs {
+			// remove the direct_io flag, as it is not well-supported on macOS
+			// https://code.google.com/archive/p/macfuse/wikis/OPTIONS.wiki recommended to avoid the direct_io flag
+			if in.Flags&fuse.FOPEN_DIRECT_IO != 0 {
+				glog.V(4).Infof("macfuse direct_io mode %v => false\n", in.Flags&fuse.FOPEN_DIRECT_IO != 0)
+				out.OpenFlags &^= fuse.FOPEN_DIRECT_IO
+			}
+		}
 		// TODO https://github.com/libfuse/libfuse/blob/master/include/fuse_common.h#L64
 	}
 	return status