linux-kernel - Re: [PATCH] f2fs: use new ioprio Macro to get ckpt thread ioprio data

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Date: Mon, 3 Jun 2024 14:52:16 +0800
From: Zhiguo Niu <niuzhiguo84@...il.com>
To: Chao Yu <chao@...nel.org>
Cc: Zhiguo Niu <zhiguo.niu@...soc.com>, jaegeuk@...nel.org, 
	linux-f2fs-devel@...ts.sourceforge.net, linux-kernel@...r.kernel.org, 
	ke.wang@...soc.com
Subject: Re: [PATCH] f2fs: use new ioprio Macro to get ckpt thread ioprio data

On Mon, Jun 3, 2024 at 2:39 PM Chao Yu <chao@...nel.org> wrote:
>
> On 2024/5/31 17:10, Zhiguo Niu wrote:
> > Use new Macro IOPRIO_PRIO_LEVEL to get ckpt thread ioprio data(level),
> > it is more accurate and consisten with the way setting ckpt thread
> > ioprio(IOPRIO_PRIO_VALUE(class, data)).
> >
> > Signed-off-by: Zhiguo Niu <zhiguo.niu@...soc.com>
> > ---
> >   fs/f2fs/sysfs.c | 2 +-
> >   1 file changed, 1 insertion(+), 1 deletion(-)
> >
> > diff --git a/fs/f2fs/sysfs.c b/fs/f2fs/sysfs.c
> > index 72676c5..55d46da 100644
> > --- a/fs/f2fs/sysfs.c
> > +++ b/fs/f2fs/sysfs.c
> > @@ -340,7 +340,7 @@ static ssize_t f2fs_sbi_show(struct f2fs_attr *a,
> >       if (!strcmp(a->attr.name, "ckpt_thread_ioprio")) {
> >               struct ckpt_req_control *cprc = &sbi->cprc_info;
> >               int class = IOPRIO_PRIO_CLASS(cprc->ckpt_thread_ioprio);
> > -             int data = IOPRIO_PRIO_DATA(cprc->ckpt_thread_ioprio);
> > +             int data = IOPRIO_PRIO_LEVEL(cprc->ckpt_thread_ioprio);
>
> So, can you please use 'level' to instead 'data' in f2fs_sbi_show() and
> __sbi_store()?
Hi Chao,

IOPRIO_PRIO_DATA in the new kernel version includes two parts: level and hint.
In __sbi_store, " IOPRIO_PRIO_VALUE(class, data)"  is used to set ckpt
iopriority,
and it will pass default hint value, we just need to keep class /level right.

 #define IOPRIO_PRIO_VALUE(prioclass, priolevel) \
   ioprio_value(prioclass, priolevel, IOPRIO_HINT_NONE)
so i think this part is not needed to modify.

thanks!
>
> Thanks,
>
> >
> >               if (class != IOPRIO_CLASS_RT && class != IOPRIO_CLASS_BE)
> >                       return -EINVAL;
>