linux-ext4 - Re: [PATCH] Ext4: Make file creation time, i_version and i

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Message-ID: <AANLkTikkaRYyUfHILDCKYzXdLi9ORuQs05Rf9TScF_Tz@mail.gmail.com>
Date:	Mon, 28 Jun 2010 11:33:10 -0500
From:	Steve French <smfrench@...il.com>
To:	David Howells <dhowells@...hat.com>
Cc:	viro@...iv.linux.org.uk, jlayton@...hat.com, mcao@...ibm.com,
	aneesh.kumar@...ux.vnet.ibm.com, linux-cifs@...r.kernel.org,
	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
	samba-technical@...ts.samba.org, sjayaraman@...e.de,
	linux-ext4@...r.kernel.org
Subject: Re: [PATCH] Ext4: Make file creation time, i_version and i_generation 
	available by xattrs

On Mon, Jun 28, 2010 at 11:26 AM, David Howells <dhowells@...hat.com> wrote:
> Make the file creation time, inode data version number and inode generation
> number available on Ext4 by as xattrs named:
>
>        file.crtime
>        file.i_generation
>        file.i_version (directories only for ext4)
>
> This could then be used by Samba as the SMB protocol passes the file creation
> time to the client.
>
> With this patch, you can see the xattrs providing binary data:
>
> [root@...romeda ~]# getfattr -d /var/cache/fscache -e hex -m\.*
> getfattr: Removing leading '/' from absolute path names
> # file: var/cache/fscache
> file.crtime=0x53ba244c000000000000000000000000
> file.i_generation=0x0000000000000000
> file.i_version=0x0400000000000000

It would be easy enough to do something similar for crtime for cifs
(it may also be possible to do something similar to
i_generation and i_version at least for smb2 but haven't
experimented to see which servers could return something
similar to version and generation).  I did have a request for
someone doing a backup application over cifs to return creation
time so at least this would make sense.


-- 
Thanks,

Steve
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