On Thu, 2014-01-16 at 07:44 +0000, Gupta, Pekon wrote:

However, *assuming NAND driver can identify erased-page correctly*, I don't want UBI/UBIFS to re-check the read_buf for 0xff again, because underlying NAND driver has already identified as erased-page, and fixed the data before passing it to above MTD layer.

I would agree only if this identification costs nothing, or very little. If for _some_ setups this would be about comparing buffers against 0xFF for every single read - then I am so sure.

Indeed, UBIFS only needs to check for blank areas at the recovery time. Normal reads do not need this. So _if_ there are measurable costs, I'd argue that there is no need for people to pay it for nothing during normal file I/O.

Hmm?

Thanks!