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SubjectRe: [PATCH] Re: filesystem being remounted supports timestamps until 2038
Hi,

On Tue, Jun 23, 2020 at 05:26:49PM -0700, Christian Kujau wrote:
> On Sat, 4 Jan 2020, Christian Kujau wrote:
> > On Sun, 29 Dec 2019, Linus Torvalds wrote:
> > > > When file systems are remounted a couple of times per day (e.g. rw/ro for backup
> > > > purposes), dmesg gets flooded with these messages. Change pr_warn into pr_debug
> > > > to make it stop.
> > >
> > > How about just doing it once per mount?
> >
> > Yes, once per mount would work, and maybe not print a warning on remounts
> > at all.
>
> Is there any chance that this can be revisited perhaps? This is still
> flooding my dmesg just because I have that (curde?) mechanism in place to
> remount the backup device after the hourly backup-run to read-only. Sure,
> I could omit that ("Doc, it hurts when I do that", as Al would comment),
> but that's really the only repeating message that gets triggered because
> of this. 1067 messages in ~60 days of uptime :-|
>
> Does the patch below make any sense, would that work?
>
> Please reconsider,
> Christian.
>
> > Commit f8b92ba67c5d ("mount: Add mount warning for impending timestamp
> > expiry") introduced:
> >
> > Mounted %s file system at %s supports timestamps until [...]
> >
> > in mnt_warn_timestamp_expiry(), but then 0ecee6699064 ("fs/namespace.c:
> > fix use-after-free of mount in mnt_warn_timestamp_expiry") changed this to
> >
> > %s filesystem being %s at %s supports timestamps until [...]
> >
> > in order to fix a use-after-free.
> >
> > > Of course, if you actually unmount and completely re-mount a
> > > filesystem, then that would still warn multiple times, but at that
> > > point I think it's reasonable to do.
> >
> > Yes, of course. Umount/remount cycles should still issue a warning, but
> > "-o remount" should not, IMHO.
> >
> > Thanks,
> > Christian.
>
> commit c9a5338b4930cdf99073042de0717db43d7b75be
> Author: Christian Kujau <lists@nerdbynature.de>
> Date: Thu Dec 26 17:39:57 2019 -0800
>
> Commit f8b92ba67c5d ("mount: Add mount warning for impending timestamp expiry") resp.
> 0ecee6699064 ("fix use-after-free of mount in mnt_warn_timestamp_expiry()") introduced
> a pr_warn message and the following gets sent to dmesg on every remount:
>
> [...] filesystem being remounted at /mnt supports timestamps until 2038 (0x7fffffff)
>
> When file systems are remounted a couple of times per day (e.g. rw/ro for backup
> purposes), dmesg gets flooded with these messages. Change pr_warn into pr_debug
> to make it stop.
>
> Signed-off-by: Christian Kujau <lists@nerdbynature.de>
>
> diff --git a/fs/namespace.c b/fs/namespace.c
> index be601d3a8008..afc6a13e7316 100644
> --- a/fs/namespace.c
> +++ b/fs/namespace.c
> @@ -2478,7 +2478,7 @@ static void mnt_warn_timestamp_expiry(struct path *mountpoint, struct vfsmount *
>
> time64_to_tm(sb->s_time_max, 0, &tm);
>
> - pr_warn("%s filesystem being %s at %s supports timestamps until %04ld (0x%llx)\n",
> + pr_debug("%s filesystem being %s at %s supports timestamps until %04ld (0x%llx)\n",
> sb->s_type->name,
> is_mounted(mnt) ? "remounted" : "mounted",
> mntpath,

This is somehow prompted by a recent update in
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=996876#46 .

The discussion on the above seems to have stalled, is this still
something worth persuing or should it be further ignored?

Regards,
Salvatore

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