Re: [f2fs-dev] [PATCH] f2fs: introduce sysfs/data_io_flag to attach REQ_META/FUA

[Chao Yu]

On 2020/4/4 0:12, Jaegeuk Kim wrote:
> This patch introduces a way to attach REQ_META/FUA explicitly
> to all the data writes given temperature.
> 
> -> attach REQ_FUA to Hot Data writes
> 
> -> attach REQ_FUA to Hot|Warm Data writes
> 
> -> attach REQ_FUA to Hot|Warm|Cold Data writes
> 
> -> attach REQ_FUA to Hot|Warm|Cold Data writes as well as
>           REQ_META to Hot Data writes

Out of curiosity, what scenario it is used for?

Thanks,