[ECOS] FW: Mount JFFS2 root file system issue

Lin, Bin (Bin) Bin.Lin@lsi.com
Fri Jan 11 15:35:00 GMT 2008


Hi Gary,

Thanks a lot for your reply. 

It is understandable that JFFS2 needs to rebuild/recover the active
nodes in the next reboot after failure.  But once this happen, every
reboot later on will take the same amount of time which is much long
than normal. I have to re-program the entire flash to get it back to
normal mount time. 

Also this problem can not reproduced in the lab. Is there a way to
craete this problem quickly?

Thanks again,
Ben


-----Original Message-----
From: Gary Thomas [mailto:gary@mlbassoc.com] 
Sent: Friday, January 11, 2008 7:40 AM
To: Lin, Bin (Bin)
Cc: ecos-discuss@sourceware.org
Subject: Re: [ECOS] FW: Mount JFFS2 root file system issue

Lin, Bin (Bin) wrote:
> Hello All,
> 
> I have ARM9 systems with JFFS2 root file system. For some reasons,
e.g.
> system crash or power failure, when system boots up next time, it 
> takes much longer time than usual to mount jffs2 root file system. It 
> can hang at following message for 3-10 min. The system will eventually

> come up and function well. This problem occurred on less than 10% of
boards.

I think this can happen (after such a failure) when JFFS2 realizes that
it needs to rebuild/recover the active nodes in the file system.  This
can require a scan of the entire file system, along with rewriting some
nodes, etc.

> NET4: Unix domain sockets 1.0/SMP for Linux NET4.0.
> Fast Floating Point Emulator V0.9 (c) Peter Teichmann.
> 
> There are some symbolic links in the root file system. These links is 
> linked to the files in another partition. Could that cause problem if 
> the file in the other partition gets corrupted? This behaviour is not 
> reproducible. Looks like the files in the flash are not corrupted. I 
> guess the corruption could be in jffs2 file system.
> 
> Anyone has seen this issue, and solution?
> 
> Appreciate very much for any input,

This looks to be a Linux kernel issue - I don't see what it has to do
with eCos.

You should probably ask on some appropriate Linux mailing list.

--
------------------------------------------------------------
Gary Thomas                 |  Consulting for the
MLB Associates              |    Embedded world
------------------------------------------------------------

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