linux-ext4 - Re: Help to edit inode content

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Message-ID: <ea11fea30905122114s212922f4g57162eb4dc4771f5@mail.gmail.com>
Date:	Wed, 13 May 2009 09:44:50 +0530
From:	Manish Katiyar <mkatiyar@...il.com>
To:	ranjith kannikara <ranjithkannikara@...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 9:41 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



>
> Regards
> ranju.
>
> --
> http://www.ranjithkannikara.blogspot.com/
> --
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-- 
Thanks -
Manish
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