[Samba] Does samba support fsync() a directory?

[Jeremy Allison]

On Fri, Feb 02, 2018 at 08:34:29PM +0800, 曹树烽 via samba wrote:
> Hi group:
>     I need some help!
>     I use samba 4.5.8
>     And I mount a samba directory from CentOS 7.
> 
>     When I run such program in the mounted directory:
> ```
> 
> #include  <stdlib.h>
> #include  <stdio.h>
> #include  <errno.h>
> #include  <fcntl.h>
> #include  <string.h>
> int  main()  {
> 	printf("open aaa\n");
>  	int  fd  =  open("aaa",  O_RDONLY  |  O_DIRECTORY,  0);
>  	if  (fd  <  0)  {
>  	perror("open aaa");
>   	}
>   	printf("sync aaa\n");
>   	if(fsync(fd))  {
>   	perror("sync aaa");
>   	}
>   	printf("OK\n");
>   	return  0;
> }
> 
> ```
> 	I get such error: `sync aaa: Invalid argument`
> 	Is this expected for samba?
> 	Thanks in advance!

Can you show us the wireshark trace and the smbd logs
from this please ?