Re: [ECOS] JFFS2 umount error

[PMD Chakravarthy <chakri26 at gmail dot com>]

Hi Gary,

I am more concerned about the behavior of JFFS2 during sudden power failure.
At the time of power failure some of the files might be open, then I
am expecting that only files that are open will lost not the others.
But I am seeing that other files on the file system are also getting
affected. Is this expected?

Regards
Chakravarthy


On Thu, May 13, 2010 at 10:12 PM, Gary Thomas <gary@mlbassoc.com> wrote:
> Please keep your replies on the mailing list so that all may benefit.
>
> On 05/13/2010 10:34 AM, PMD Chakravarthy wrote:
>>
>> Hi Gary,
>>
>> Thanks for the reply. I am trying to umount the filesystem before a
>> reboot. How can I close all open files before a reboot(and unmount)?
>> If I don't successfully unmount and force reboot(power cycle) the
>> system, I am seeing 2 behaviours.
>>
>>   a) The file which is open(Ino #9) during unmount is lost.
>>   b) Some times other files in the filesystem are also lost(CRC errors).
>>
>> How can I avoid situation #b ?
>
> I no nothing of your application so it's hard to tell you what to do.
> If you are trying to reboot, you're going to need to figure out a way
> to make sure all open files have been closed.  This will require some
> application knowledge as the problems you are having may not be directly
> related (certainly not case a) to JFFS2, but rather buffered I/O (such
> as the standard fwrite() functions)
>
>> On Thu, May 13, 2010 at 8:59 PM, Gary Thomas<gary@mlbassoc.com>  wrote:
>>>
>>> On 05/13/2010 09:20 AM, PMD Chakravarthy wrote:
>>>>
>>>> Hi,
>>>>
>>>> I am using jffs2 file system on ecos 3.0. I am getting the following
>>>> errors when try to unmount the filesystem.
>>>>
>>>> Refuse to unmount.
>>>> Ino #1 has use count 2
>>>> Ino #9 has use count 1
>>>>
>>>> Did any one see these kind of issues? What could be the reason for
>>>> these warning messages.
>>>
>>> You still have files open (inode #1&  #9).  You can't unmount
>>> the file system until all files have been closed.
>>>
>>> Figure out the file name of those inodes and close them.
>
> --
> ------------------------------------------------------------
> Gary Thomas                 |  Consulting for the
> MLB Associates              |    Embedded world
> ------------------------------------------------------------
>

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