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Date: Wed, 26 Aug 2015 06:17:41 -0700
From: Christoph Hellwig <hch@infradead.org>
To: Peng Tao <tao.peng@primarydata.com>
Cc: linux-fsdevel@vger.kernel.org,
        Trond Myklebust <trond.myklebust@primarydata.com>,
        Anna Schumaker <anna.schumaker@netapp.com>, Zach Brown <zab@zabbo.net>,
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Subject: Re: [PATCH-RFC-RESEND 2/9] vfs/btrfs: add .clone_range file operation
Message-ID: <20150826131741.GA22249@infradead.org>
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You need to eep the existing defintion, either as a duplicate with a
comment, or by including the uapi fs.h and defininin it to the new name.

Also this will break cifs, which uses the BTRFS_IOC_CLONE defintion
already.