linux-kernel - Re: [PATCH] ocfs2: heartbeat: replace simple

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Message-ID: <CAGiJo8RBBs-4ATOP-sJkE-TWiGxbXHaKQP+_qsGKTmWhuUwrBA@mail.gmail.com>
Date: Thu, 14 Nov 2024 23:53:49 -0800
From: Daniel Yang <danielyangkang@...il.com>
To: Joseph Qi <joseph.qi@...ux.alibaba.com>
Cc: Mark Fasheh <mark@...heh.com>, Joel Becker <jlbec@...lplan.org>, 
	"open list:ORACLE CLUSTER FILESYSTEM 2 (OCFS2)" <ocfs2-devel@...ts.linux.dev>, open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] ocfs2: heartbeat: replace simple_strtoul with kstrtoul

On Thu, Nov 14, 2024 at 5:01 PM Joseph Qi <joseph.qi@...ux.alibaba.com> wrote:
>
>
>
> On 11/13/24 4:41 PM, Daniel Yang wrote:
> > The function simple_strtoul is deprecated due to ignoring overflows and
> > also requires clunkier error checking. Replacing with kstrtoul() leads
> > to safer code and cleaner error checking.
> >
> > Signed-off-by: Daniel Yang <danielyangkang@...il.com>
> > ---
> >  fs/ocfs2/cluster/heartbeat.c | 15 +++++++++------
> >  1 file changed, 9 insertions(+), 6 deletions(-)
> >
> > diff --git a/fs/ocfs2/cluster/heartbeat.c b/fs/ocfs2/cluster/heartbeat.c
> > index dff18efbc..4fc1b23f1 100644
> > --- a/fs/ocfs2/cluster/heartbeat.c
> > +++ b/fs/ocfs2/cluster/heartbeat.c
> > @@ -1537,8 +1537,9 @@ static int o2hb_read_block_input(struct o2hb_region *reg,
> >       unsigned long bytes;
> >       char *p = (char *)page;
>
> Please define 'ret' here to make code style consistent.
> >
> > -     bytes = simple_strtoul(p, &p, 0);
> > -     if (!p || (*p && (*p != '\n')))
> > +     int ret = kstrtoul(p, 0, &bytes);
> > +
>
> The above blane line can be eleminated.
>
> > +     if (ret)
> >               return -EINVAL;
> >
> >       /* Heartbeat and fs min / max block sizes are the same. */
> > @@ -1627,8 +1628,9 @@ static ssize_t o2hb_region_blocks_store(struct config_item *item,
> >       if (reg->hr_bdev_file)
> >               return -EINVAL;
> >
> > -     tmp = simple_strtoul(p, &p, 0);
> > -     if (!p || (*p && (*p != '\n')))
> > +     int ret = kstrtoul(p, 0, &tmp);
> > +
>
> Ditto.
>
> > +     if (ret)
> >               return -EINVAL;
> >
> >       if (tmp > O2NM_MAX_NODES || tmp == 0)
> > @@ -2142,8 +2144,9 @@ static ssize_t o2hb_heartbeat_group_dead_threshold_store(struct config_item *ite
> >       unsigned long tmp;
> >       char *p = (char *)page;
> >
> > -     tmp = simple_strtoul(p, &p, 10);
> > -     if (!p || (*p && (*p != '\n')))
> > +     int ret = kstrtoul(p, 10, &tmp);
> > +
>
> Ditto.
>
> Thanks,
> Joseph
> > +     if (ret)
> >                  return -EINVAL;
> >
> >       /* this will validate ranges for us. */
>

Ok sounds good. I moved ret to the beginning of each function and
removed the empty line after each ret = kstrtoul() statement. I just
sent a v2 of this patch. Let me know if there's any other issues.

- Daniel