linux-kernel - Re: [f2fs-dev] [PATCH] f2fs-tools: allocate logs after conventional area for HM zoned devices

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Date: Thu, 25 Jan 2024 08:25:43 -0800
From: Daeho Jeong <daeho43@...il.com>
To: Chao Yu <chao@...nel.org>
Cc: linux-kernel@...r.kernel.org, linux-f2fs-devel@...ts.sourceforge.net, 
	kernel-team@...roid.com, Daeho Jeong <daehojeong@...gle.com>, 
	Yongpeng Yang <yangyongpeng1@...o.com>
Subject: Re: [f2fs-dev] [PATCH] f2fs-tools: allocate logs after conventional
 area for HM zoned devices

On Wed, Jan 24, 2024 at 7:34 PM Chao Yu <chao@...nel.org> wrote:
>
> +Cc Yongpeng Yang
>
> Daeho,
>
> Yongpeng reports a potential issue: if c.devices[0].total_segments is
> larger than segments of mainarea, c.cur_seg[CURSEG_HOT_NODE] will exceed
> end boundary of mainarea. Could you please check that? though it's a corner
> case.

Can you elaborate more?
In the case of F2FS_ZONED_HM, we have the devices[1].
Do you mean the case we format the filesystem intentionally smaller
than what devices have?

>
> On 2024/1/18 7:00, Daeho Jeong wrote:
> > From: Daeho Jeong <daehojeong@...gle.com>
> >
> > Make to allocate logs after conventional area for HM zoned devices to
> > spare them for file pinning support.
> >
> > Signed-off-by: Daeho Jeong <daehojeong@...gle.com>
> > ---
> >   mkfs/f2fs_format.c | 3 ++-
> >   1 file changed, 2 insertions(+), 1 deletion(-)
> >
> > diff --git a/mkfs/f2fs_format.c b/mkfs/f2fs_format.c
> > index f2840c8..91a7f4b 100644
> > --- a/mkfs/f2fs_format.c
> > +++ b/mkfs/f2fs_format.c
> > @@ -557,7 +557,8 @@ static int f2fs_prepare_super_block(void)
> >               c.cur_seg[CURSEG_COLD_DATA] = 0;
> >               c.cur_seg[CURSEG_WARM_DATA] = next_zone(CURSEG_COLD_DATA);
> >       } else if (c.zoned_mode) {
> > -             c.cur_seg[CURSEG_HOT_NODE] = 0;
> > +             c.cur_seg[CURSEG_HOT_NODE] = c.zoned_model == F2FS_ZONED_HM ?
> > +                     c.devices[0].total_segments : 0;
> >               c.cur_seg[CURSEG_WARM_NODE] = next_zone(CURSEG_HOT_NODE);
> >               c.cur_seg[CURSEG_COLD_NODE] = next_zone(CURSEG_WARM_NODE);
> >               c.cur_seg[CURSEG_HOT_DATA] = next_zone(CURSEG_COLD_NODE);