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

To: Zheng Liu <gnehzuil.liu@xxxxxxxxx>
Subject: Re: [PATCH 0/4][RFC] remove duplicated check from ext4, xfs, btrfs, and ocfs2
From: Christoph Hellwig <hch@xxxxxxxxxxxxx>
Date: Tue, 20 Nov 2012 05:14:53 -0500
Cc: linux-fsdevel@xxxxxxxxxxxxxxx, linux-ext4@xxxxxxxxxxxxxxx, xfs@xxxxxxxxxxx, linux-btrfs@xxxxxxxxxxxxxxx, ocfs2-devel@xxxxxxxxxxxxxx, yan@xxxxxxxxxxxxxxxxxx, Zheng Liu <wenqing.lz@xxxxxxxxxx>
In-reply-to: <1353403785-3489-1-git-send-email-wenqing.lz@xxxxxxxxxx>
References: <1353403785-3489-1-git-send-email-wenqing.lz@xxxxxxxxxx>
User-agent: Mutt/1.5.21 (2010-09-15)
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.

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