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From: Richard Weinberger <richard@nod.at>
To: Pavel Machek <pavel@ucw.cz>
Cc: kernel list <linux-kernel@vger.kernel.org>, dedekind1@gmail.com,
 adrian.hunter@intel.com, linux-mtd@lists.infradead.org,
 linux-fsdevel@vger.kernel.org
Subject: Re: ubifs: noatime support?
Date: Thu, 18 Jan 2018 21:44:33 +0100
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Pavel,

Am Donnerstag, 18. Januar 2018, 20:30:15 CET schrieb Pavel Machek:
> Hi!
> 
> Ubifs seems to have atime support these days:
> 
>           sb->s_flags |= SB_ACTIVE;
> #ifndef CONFIG_UBIFS_ATIME_SUPPORT
>           sb->s_flags |= SB_NOATIME;
> #else
>           ubifs_msg(c, "full atime support is enabled.");
> #endif
> 
> Which can be configured at compile-time, but no option to disable it
> at runtime. What is going on there?
> 
> UBIFS: parse noatime
> UBIFS error (ubi1:0 pid 94): ubifs_parse_options.constprop.5:
> unrecognized mount option "noatime" e
> mount: mounting ubi1:log_volume on /mnt/log failed: Invalid argument

Filesystems don't parse the "noatime" string, it is job of the mount tool to 
translate it to the MS_NOATIME mount flag.

Thanks,
//richard