linux-kernel - Re: Intercepting system calls

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Message-ID: <CAOh0hwP=Pq0Gbd002QGVvULNj60o2RPR3sZz94RVZvM2pstVzQ@mail.gmail.com>
Date:	Thu, 29 Dec 2011 12:08:33 +0530
From:	Gaurav Saxena <grvsaxena419@...il.com>
To:	Wojciech Zygmunt Porczyk <wojciech@...czyk.eu>
Cc:	John Stoffel <john@...ffel.org>,
	richard -rw- weinberger <richard.weinberger@...il.com>,
	linux-kernel@...r.kernel.org
Subject: Re: Intercepting system calls

Hello Wojciech, Thanks for your reply.

On 12/28/11, Wojciech Zygmunt Porczyk <wojciech@...czyk.eu> wrote:
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> On Fri, Dec 23, 2011 at 10:33:45PM +0530, Gaurav Saxena wrote:
>> I am trying to write an application which would create a backup for
>> the system so that it could be restored as it is. For example I create
>> a backup using my application. I just do nothing at time of backup so
>> it would be fast. Now whenever I see any deletion I would save that
>> file so that I could restore it.
>
> You almost certainly wan't to research LVM(-like) snapshots. They are
> operating in block layer, so you can restore fs "as it was", with COW
> feature they do "nothing" at creation and just save overwritten data
> somewhere else.
Yes I understand what I want to implement is done in LVM snapshots.
But I want to implement this functionality using a different approach.
As LVM are filesystem dependent and cannot work without repartitioning
of the system. Also they make system slow after many snapshots are
created.
>
> See: lvcreate(8), xfs_freeze(8). Maybe btrfs(8) ("btrfs subvolume
> snapshot") but btrfs is not really production-ready, so get lvm2+xfs.
>
> - --
> regards
> WZJP
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-- 
Thanks and Regards ,
Gaurav
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