[linux-cifs-client] Re: [PATCH] CIFS: make sec=none force an anonymous mount

[Christoph Hellwig]

On Thu, May 03, 2007 at 02:32:33PM -0400, Jeff Layton wrote:
> We had a customer report that attempting to make CIFS mount with a null
> username (i.e. doing an anonymous mount) doesn't work. Looking through the
> code, it looks like CIFS expects a NULL username from userspace in order
> to trigger an anonymous mount. The mount.cifs code doesn't seem to ever
> pass a null username to the kernel, however.
> 
> It looks also like the kernel can take a sec=none option, but it only seems
> to look at it if the username is already NULL. This seems redundant and
> effectively makes sec=none useless.
> 
> The following patch makes sec=none force an anonymous mount. I've briefly
> tested it and it seems to work. I suppose we could alternately do some
> stuff in userspace to make mount.cifs force a null username instead, but this
> seems more straightforward to me.

Looks useful.  In case you have some spare time at your hand it would
be really nice to convert cifs option parsing to the lib/parser.c code
and move all validation of the arguments into one place, so it's easily
understanable and better to maintain.