linux-kernel - Re: [PATCH v1 00/30] Ext4 snapshots

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Message-ID: <BANLkTik9Mnq5yqK795pxyr8SK-3EOzzNhA@mail.gmail.com>
Date:	Thu, 9 Jun 2011 11:51:07 +0800
From:	Yongqiang Yang <xiaoqiangnk@...il.com>
To:	"Amir G." <amir73il@...rs.sourceforge.net>
Cc:	Lukas Czerner <lczerner@...hat.com>, linux-ext4@...r.kernel.org,
	tytso@....edu, linux-kernel@...r.kernel.org, sandeen@...hat.com
Subject: Re: [PATCH v1 00/30] Ext4 snapshots

On Thu, Jun 9, 2011 at 11:18 AM, Amir G. <amir73il@...rs.sourceforge.net> wrote:
> On Thu, Jun 9, 2011 at 4:59 AM, Yongqiang Yang <xiaoqiangnk@...il.com> wrote:
>>> But I do understand the difference. And also, when it comes to fs level
>>> snapshotting I would suspect that it would do something we can not do
>>> with the current solutions, for example per-file or per-directory snapshots,
>>> cat ext4 snapshots do that ?
>> Hi Lukas,
>>
>> I noticed that there is no answer to this question in the thread.  I
>
> I think I answered this question with No it can't ;-)
I think this can be implemented easily by chattr and adding check in
should_snapshot() or should_move_data().

And I thought Lukas are focusing on if ext4-snapshots can do this
easily.  So i said YES:-)

>
>> can give the question the answer that ext4 can snapshot per-file or
>> per-directory, and can exclude some files or directories from being
>> snapshotted.
>>
>
> So the full answer is that ext4 snapshot CAN exclude
> certain files/dirs from snapshot, but this feature is not fully implemented yet
> (I have it in a dev branch)
>
>> --
>> Best Wishes
>> Yongqiang Yang
>>
>



-- 
Best Wishes
Yongqiang Yang
--
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