[PATCH 6/9] mtd: Add a 'block unused' ioctl call to provide hints to block drivers

[Pavel Machek]

Hi!

> Knowing that the data in a given block is now unused is a useful
> feature that some block drivers can take advantage of, especially 
> when dealing with devices like flash.
> 
> This adds an ioctl which allows such hints to be passed to the

Maybe Documentation/ piece would be nice if this can be called from
userspace....

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