Re: Negative caching of failed mount attempts

[Ian Kent <raven@themaw.net>]

Leonardo Chiquitto wrote:
> Hello,
> 
> Three years ago, commit 2d753e62b8 removed kernel-side caching
> of mount attempts that returns -ENOENT. Apparently it wasn't
> working as it should.

It stopped working when 2.6 was released due to changes in the VFS.
These changes made it extremely hard to do in the kernel module. Efforts
to do it in the kernel module have been abandoned at this stage.

> I see that this feature is now implemented in the user land AutoFS 5
> daemon, but it wasn't back ported to AutoFS 4. I understand that
> version 4 is not maintained anymore, but I'd like to ask if someone
> has a patch around that implements this feature.

I guess that's what it amounts to, since all the effort is going into v5.

I have a bunch of patches for v4 from Jeff Moyer that I've not got
around to looking closely at and applying. We didn't get as far as the
negative lookup caching patch though. In fact I don't think it had been
written then.

What version of autofs?
Do you have any other patches applied to it?

Ian