No subject

fileA. But from offsetC to the end is different from fileA at the same
offset offsetC, it's not empty either.
Hope I expressed myself clearly.

> docs about write-back and the related issues. Dig UBIFS docs and FAQ.
> E.g.:
>
> http://www.linux-mtd.infradead.org/faq/ubifs.html#L_empty_file
> http://www.linux-mtd.infradead.org/doc/ubifs.html#L_writeback
>
> If you have a _specific_ question, feel free to ask, of course. But
> for this general question I do not have a better answer than RTFM
> :-)))
>
>> PS:how do you test data integrity of ubifs under power loss?
>
> We mostly checked it using either 'integck' (see mtd-utils) or
> 'fsstress' (see LTP). We ran those tests and cut power off at random
> points using these devices:
>
> http://www.cpscom.com/gprod/ipn.htm
>
> Then we mounted the FS. We did not really check the contents of the
> FS, because it is not simple and tricky, but we checked that it mounts,
> re-mounts, and files are readable/writable/deletable.

Thanks for this information.

Regards,
Jisheng