Corrupt Empty Space Error at Runtime

[Richard Weinberger]

Hi!

Am 21.12.2015 um 02:42 schrieb Sheng Yong:
> We have met several empty space corruptions these days, since the ECC
> functionality of the NAND controller driver seems not work correctly.
> But we are still considering if there is any workaroud to let UBIFS
> check if the corruption occurs really in empty space. If it is, UBIFS
> should recover the LEB.
> 
> There are 2 conditions we may check:
> 1. the left space size is less than the min size of a node, it must be
>    empty space;
> 2. how many bits are fliped in left space, if they are less than 4 bits
>    (many NAND support 1~4 bits ECC), it should be in empty space;

Please consider fixing the driver first.
We also have patches for gpmi. Maybe we can find a common way
to fix this clearly within MTD without weakening UBIFS.

Thanks,
//richard