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Re: [PATCH 0/4][RFC] remove duplicated check from ext4, xfs, btrfs, and

To: Christoph Hellwig <hch@xxxxxxxxxxxxx>
Subject: Re: [PATCH 0/4][RFC] remove duplicated check from ext4, xfs, btrfs, and ocfs2
From: Zheng Liu <gnehzuil.liu@xxxxxxxxx>
Date: Tue, 20 Nov 2012 18:46:46 +0800
Cc: linux-fsdevel@xxxxxxxxxxxxxxx, linux-ext4@xxxxxxxxxxxxxxx, xfs@xxxxxxxxxxx, linux-btrfs@xxxxxxxxxxxxxxx, ocfs2-devel@xxxxxxxxxxxxxx, yan@xxxxxxxxxxxxxxxxxx, Zheng Liu <wenqing.lz@xxxxxxxxxx>
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In-reply-to: <20121120101452.GA692@xxxxxxxxxxxxx>
Mail-followup-to: Christoph Hellwig <hch@xxxxxxxxxxxxx>, linux-fsdevel@xxxxxxxxxxxxxxx, linux-ext4@xxxxxxxxxxxxxxx, xfs@xxxxxxxxxxx, linux-btrfs@xxxxxxxxxxxxxxx, ocfs2-devel@xxxxxxxxxxxxxx, yan@xxxxxxxxxxxxxxxxxx, Zheng Liu <wenqing.lz@xxxxxxxxxx>
References: <1353403785-3489-1-git-send-email-wenqing.lz@xxxxxxxxxx> <20121120101452.GA692@xxxxxxxxxxxxx>
User-agent: Mutt/1.5.21 (2010-09-15)
On Tue, Nov 20, 2012 at 05:14:53AM -0500, Christoph Hellwig wrote:
> On Tue, Nov 20, 2012 at 05:29:41PM +0800, Zheng Liu wrote:
> > Hi all,
> > 
> > This patch series tries to remove a sanity check in fallocate from specific
> > filesystems because vfs has already checked it.
> > 
> > I am not very familiar with why we need to do this duplicated check.  
> > Please let
> > me know if I miss something.
> 
> Each filesystem driver checks to see if a flag that it doesn't support
> gets passed down.  This was done with the intention that we can add new
> flags to the VFS without having to update every filesystem.

Thanks for your explanation.

Regards,
                                                - Zheng

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