Re: [PATCH v4 1/2] f2fs: refactor struct iostat_lat_info

[Yangtao Li]

> > +		ctx = iostat_get_bio_private(bio);
>
> This ctx is not used for iostat.

Considering that the next patch needs to store the discard_cmd pointer
in bio_iostat_ctx, there is no need to add a new variable.
We just need to rename post_read_ctx to data.
Change bio_iostat_ctx->post_read_ctx to bio_iostat_ctx->data?

Following the above logic, should get_post_read_ctx be changed to iostat_get_bio_data?
Since the function is located in the iostat file, we added the iostat prefix.

Thx,
Yangtao