Date: Wed, 14 Oct 2015 22:56:30 -0700
From: Christoph Hellwig <hch@infradead.org>
To: Andy Lutomirski <luto@amacapital.net>
Cc: Christoph Hellwig <hch@infradead.org>,
        Anna Schumaker <Anna.Schumaker@netapp.com>,
        "Darrick J. Wong" <darrick.wong@oracle.com>, linux-nfs@vger.kernel.org,
        Linux btrfs Developers List <linux-btrfs@vger.kernel.org>,
        Linux FS Devel <linux-fsdevel@vger.kernel.org>,
        Linux API <linux-api@vger.kernel.org>, Zach Brown <zab@zabbo.net>,
        Al Viro <viro@zeniv.linux.org.uk>, Chris Mason <clm@fb.com>,
        Michael Kerrisk-manpages <mtk.manpages@gmail.com>, andros@netapp.com
Subject: Re: [PATCH v5 8/9] vfs: Add vfs_copy_file_range() support for
 pagecache copies
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On Wed, Oct 14, 2015 at 11:53:45AM -0700, Andy Lutomirski wrote:
> Would copy_file_range without the reflink option removed still be
> permitted to link blocks on supported filesystems (btrfs and maybe
> XFS)?

Absolutely.  Unless the COPY_FALLOCATE or whatever we call it option is
specified of course.  But I'd really love to get basic copy
infrastructure in for 4.4 and then define these options later.