[LTP] [PATCH RFC] sync_file_range02: remove the toplimit of write back

[Yang Xu]

Hi Li
> Hi Yang,
> 
> Yang Xu <xuyang2018.jy@cn.fujitsu.com 
> <mailto:xuyang2018.jy@cn.fujitsu.com>> wrote:
> 
>     ...
> 
>>
>>     I have tried this for many different systems, and it doesn't hit
>>     the failure at least one time. So if no more comments, I would
>>     merge the patch as below in the next step.
> 
>     I have a question.we must call sync()? I think syncfs is more accurate.
> 
> 
> Here we use sync() is to make fs metadata/cache being written back 
> before testing because there is no obtainable file descriptor 'fd' for 
> the ext4 deferred IO (e.g. initialize the journal and inode tables).
I see. For other test cases using tst_dev_bytes_written api such as 
fdatasync03.c,  we also need to call sync() to make this written value 
more accurate.  What do you think about it？

Best Regards
Yang Xu
> 
> -- 
> Regards,
> Li Wang