Re: [PATCH 0/4][RFC] remove duplicated check from ext4, xfs, btrfs, and ocfs2

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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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