[PATCH MTD-UTILS 5/5] ubiattach: introduce max_beb_per1024 in UBI_IOCATT

[Artem Bityutskiy]

On Wed, 2012-08-22 at 14:30 +0300, Artem Bityutskiy wrote:
> 1. Add a 'get device property' ioctl, similar to the 'set volume
> property' ioctl we have. And use this ioctl to query the current bad
> PEBs limit.
> 
> 2. Just call the 'attach' ioctl with an insane max_beb_per1024 value
> (say, -1) first. If it succeeded, than the driver does not support
> max_beb_per1024 at all, and you may exit with a warning that you have
> attached it, but the max_beb_per1024 was ignored because the kernel is
> old.
> 
> If it fails with -EINVAL, this means the kernel checked the value and
> the feature is supported, so you can call it for the second time with
> the right max_beb_per1024.
> 
> The first approach is more complex but probably cleaner. The second is
> easier to implement.

I guess I prefer the second option, though. What do you think?

-- 
Best Regards,
Artem Bityutskiy
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