Re: New rule for xD FTL driver

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On Tue, 2010-06-15 at 18:27 +0300, Maxim Levitsky wrote: 
> On Tue, 2010-06-15 at 07:55 -0700, Greg KH wrote: 
> > On Tue, Jun 15, 2010 at 04:22:24PM +0300, Maxim Levitsky wrote:
> > > On Tue, 2010-06-15 at 11:28 +0100, David Woodhouse wrote: 
> > > > On Tue, 2010-06-15 at 13:07 +0300, Maxim Levitsky wrote:
> > > > > Maybe not statically linked in it, but I am not against making mtd core
> > > > > load all compiled FTL drivers as soon as an mtd device is registred.
> > > > > 
> > > > > David Woodhouse, what do you think about that? 
> > > > 
> > > > I'm not massively keen on that. An FTL is like a file system. Would you
> > > > insist on loading all compiled file systems when an mtd device is
> > > > registered?
> > > > 
> > > > Would you submit udev patches which auto-load btrfs when a block device
> > > > is registered, such as the patch I see in the mail to which I'm
> > > > replying?
> > > 
> > > This is very good point.
> > > The correct solution therefore is to create a new probe tool to look at
> > > new mtd device to see the 'filesystem magic', and them load the
> > > corresponding FTL.
> > 
> > Yes, that sounds like the correct thing to do.
> > 
> > > However, this still requires mtdchar or mtdblock be present.
> > > I think its not a bad idea to make mtdchar to load automatically on mtd
> > > device addition, and then bind the prober to creation of /dev/mtd0...
> > > (Which sure will be an udev rule)
> > > 
> > > This is a bit out of my reach now because I am quite busy with exams, so
> > > for now, it would be nice to have this udev rule (so users won't tell me
> > > that my driver doesn't work), and later I sure fix that.
> > 
> > No, as you pointed out, this is not the correct thing, so why would we
> > want to add it this way?
> A temporarily solution which is also more or less ok.
> I am not writing a rule to load all FTL driver, but only the sm_ftl.
> Maybe I write the prober now after all though.

Can udev helper tell udev to load modules by setting some variable?

Because otherwise I would need to export a variable for each FTL, and
have a rule for each such variable to load a module.

Best regards,
Maxim Levitsky

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