Message-ID: <20aa8c370905122123l23c02994q7fc41bd8b529342e@mail.gmail.com>
Date:	Wed, 13 May 2009 09:53:04 +0530
From:	ranjith kannikara <ranjithkannikara@...il.com>
To:	Manish Katiyar <mkatiyar@...il.com>
Cc:	Andreas Dilger <adilger@....com>, Bryan Donlan <bdonlan@...il.com>,
	linux-kernel@...r.kernel.org, linux-ext4@...r.kernel.org
Subject: Re: Help to edit inode content

On Wed, May 13, 2009 at 9:44 AM, Manish Katiyar <mkatiyar@...il.com> wrote:
> On Wed, May 13, 2009 at 9:41 AM, ranjith kannikara
> <ranjithkannikara@...il.com> wrote:
>> On Wed, May 13, 2009 at 1:33 AM, Andreas Dilger <adilger@....com> wrote:
>>> On May 12, 2009  21:32 +0530, ranjith kannikara wrote:
>>>> On Tue, May 12, 2009 at 9:26 PM, Bryan Donlan <bdonlan@...il.com> wrote:
>>>> > On Tue, May 12, 2009 at 11:47 AM, ranjith kannikara
>>>> > <ranjithkannikara@...il.com> wrote:
>>>> >> I am a computer science engineering student. We have started a project
>>>> >> to make an application to recover deleted files from an ext3
>>>> >> filesystem. For that we have a doubt . Can we edit the inode content?
>>>> >> ie the recovery will be robust if we could edit the inode contents and
>>>> >> give the pointer address manually or through a code. The inode is
>>>> >> being created in the kernel mode and is it possible to edit those
>>>> >> contents if the code is allowed to have the kernel mode permissions..?
>>>>
>>>> But we would like to know whether it is possible to edit the inode
>>>> because it will make the recovery easy and robust. ie he know the
>>>> details of the inode of the file which had been deleted is it possible
>>>> to edit the content of that inode with the pointers of the deleted
>>>> file.?
>>>
>>> Are you asking whether it is possible to modify the on-disk structure
>>> of the ext3 inode? Generally that is NOT allowed because it will of
>>> course break all existing filesystems if not done with extreme care.
>>>
>>> Cheers, Andreas
>>> --
>>> Andreas Dilger
>>> Sr. Staff Engineer, Lustre Group
>>> Sun Microsystems of Canada, Inc.
>>>
>>>
>> Hi,
>> Actually I was asking the same. whether it is possible to edit the
>> inode content of a disk or the image of a disk. Did you mean that it
>> is not possible at all. Is there any method to edit the inode content
>> and use the edited inode for a file, If we can ensure high care.
>> because such a method will be the most robust one in the recovery of
>> deleted file.
>
> Sorry , but it is still not clear to me whether you are trying to
> change the on-disk structure of the inode or just change the ondisk
> *contents* of some deleted inode to recover it.  Can you give an
> example of what you are trying to do ?
>
> Thanks -
> Manish
>
Ok, I will
I want to edit the contects of some deleted inode to recover the file. ie
I have a file 'foo' with inode 123. and the inode have the direct and
indirect data pointers in it.
Now i deleted the file and is trying to recover it.
I somehow could get what was the content,which is the pointers in the inode.
Now I would like to edit the inode 123 so that it will contain the
above pointers and will be the same deleted file itself.

I hope now its clear and you can help me.
Regards
Ranju.
>
>
>>
>> Regards
>> ranju.
>>
>> --
>> http://www.ranjithkannikara.blogspot.com/
>> --
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>
>
>
> --
> Thanks -
> Manish
>



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