Mounting UBIFS readonly - is it really readonly?

Artem Bityutskiy dedekind1 at
Mon Aug 23 08:41:23 EDT 2010

On Mon, 2010-08-23 at 15:23 +0300, Artem Bityutskiy wrote:
> On Tue, 2010-07-27 at 21:05 +0200, Sergei Zhirikov wrote:
> > As you can see, there is "ro", which causes UBIFS to be initially
> > mounted readonly. And later it is *never* remounted read-write.
> > Everything seems to work as expected (I get "Read-only file system"
> > error upon a write attempt) except one thing. Somehow the modification
> > time of /dev/console is updated every time the system boots. Note: I'm
> > not talking about the /dev/console located inside the /dev mount
> > (which is tmpfs and is obvously writable), I'm talking about
> > the /dev/console located on the root file system and accessed
> > (probably by init) before /dev is mounted. I'm really puzzled. How is
> > this possible? The root filesystem has been readonly all the time and
> > still the timestamp is somehow updated. Does anyone have an idea what
> > might be going on there?
> Did you solve the issue, I'm just curious.

I think you can use inotify to verify whether the FS is ever changed?

Best Regards,
Artem Bityutskiy (Артём Битюцкий)

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