Journal abortion in ext3 and its relation with remounting

[Ric Wheeler]

On 01/21/2013 10:18 AM, shubham wrote:
> I have RHEL-5.8 installed server.
>
> Due to some inconsistent read write operation, ext3 journal got corrupted and 
> aborted but filesystem was not remounted read only.
> In my understanding when there is ext3 journal has some corruption then it 
> should mount the filesystem read only .
> So, I want to know in what cases this will not happen.
>
> For unlinked inodes, I want to know the logic of handling unlinked inodes in 
> filesystem.
>
> For an ex:
> - Situation where unlinked inode will be found.
> - How ext3 identifies unlinked inode ?
> - What ext3 does when it sees an unlinked inode.
>
> Regards
> Shubham

Hi Shubham,

If you are a Red Hat customer, you can always contact Red Hat Support. Upstream 
lists can be helpful with ext3 in general, but we carry a lot of backports in 
RHEL kernels that most upstream focused developers don't usually have to pay 
attention to.

Best regards,

Ric

>
> On 21-Jan-13 8:12 AM, Theodore Ts'o wrote:
>> On Sun, Jan 20, 2013 at 07:39:24PM +0530, shubham wrote:
>>> I was looking at the code of ext3 file system and found some strange
>>> implementation there :
>>>
>>> Can someone let me know the validity of below statements and with
>>> reasoning :
>>>
>>> 1. I found that it might also happen that journal is aborted but not
>>> re-mounted
>>> 2. Journal gets aborted but it might be possible to mount it in
>>> read-write mode.
>>> 3. Can we write some data on the partition where journal is aborted.
>> Sorry, I'm not at all sure what you're asking.  Can you go into more
>> detail about what you're concerned about?
>>
>> Since I'm guessing English is not your first language, perhaps you can
>> demonstrates with a series of commands which triggers what you think
>> could happen?  Or point at the explicit C code that for which you have
>> questions?
>>
>>> One more question, how unlinked inode is handled by ext3 ?
>> Handled in what way?   Again, what are you wondering about?
>>
>>                                               - Ted
>
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