[PATCH v3] UBI: block: Dynamically allocate minor numbers

[Ezequiel Garcia]

On 03/17/2015 02:37 PM, Dan Ehrenberg wrote:
> This patch makes ubiblock devices have minor numbers beginning from
> 0, allocated dynamically independently of the ubi device/volume
> number. This property becomes useful because, on 32-bit architectures
> with LFS turned off in a userspace program, device minor numbers
> over 8 bits cause stat to return -EOVERFLOW. If the device number is
> high (>1) due to multiple MTD partitions, such an overflow will occur.
> While enabling LFS is clearly a nicer solution, it's often difficult
> to turn on in practice globally as many widely distributed packages
> don't work with LFS on.
> 
> Other storage systems have their own workarounds, with SCSI making
> multiple device majors and MMC having a config option for the number
> of partitions per device. A completely dynamic minor numbering is
> simpler than these. It is unlikely that anyone is depending on a
> static minor number since the major is dynamic anyway. In addition,
> ubiblock is still relatively new, so now is the time to make such
> changes.
> 
> Signed-off-by: Dan Ehrenberg <dehrenberg at chromium.org>
> 

Acked-by: Ezequiel Garcia <ezequiel at vanguardiasur.com.ar>
-- 
Ezequiel Garcia, VanguardiaSur
www.vanguardiasur.com.ar