Re: Help to edit inode content

From: Manish Katiyar <mkatiyar@gmail.com>
To: ranjith kannikara <ranjithkannikara@gmail.com>
Cc: Bryan Donlan <bdonlan@gmail.com>,
	linux-kernel@vger.kernel.org, linux-ext4@vger.kernel.org
Subject: Re: Help to edit inode content
Date: Tue, 12 May 2009 21:43:47 +0530	[thread overview]
Message-ID: <ea11fea30905120913y34586943y1567df47022ead50@mail.gmail.com> (raw)
In-Reply-To: <20aa8c370905120902o71ab9adflb8619e2a9ae343d0@mail.gmail.com>

On Tue, May 12, 2009 at 9:32 PM, ranjith kannikara
<ranjithkannikara@gmail.com> wrote:
> On Tue, May 12, 2009 at 9:26 PM, Bryan Donlan <bdonlan@gmail.com> wrote:
>> On Tue, May 12, 2009 at 11:47 AM, ranjith kannikara
>> <ranjithkannikara@gmail.com> wrote:
>>> Hi,
>>> 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?

Hi,

yes you can. See the debugfs tool which comes with e2fsprogs. It
allows you to open a filesystem and then change the attributes of an
inode. It also has libext2fs which you can use to write programs
through its exported APIs.

Hope that helps

- Manish

>>> 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..?
>>
>> You'd probably be best off doing this in userspace, with the
>> filesystem unmounted.
> Of course we are doing it from another filesystem. ie only after
> unmounting the filesystem which is being worked on. in some case we
> make image of the filesystem to ensure security of data.
>> Generally speaking, don't attempt to alter the filesystem from
>> userspace while it is mounted.
>>
> 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.?
> Regards
> Ranju.
>
>
>
> --
> http://www.ranjithkannikara.blogspot.com/
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-- 
Thanks -
Manish