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Date:   Tue, 8 Nov 2022 09:51:40 -0800
From:   Jeremy Allison <jra@samba.org>
To:     Christoph Hellwig <hch@infradead.org>
Cc:     Steve French <smfrench@gmail.com>,
        CIFS <linux-cifs@vger.kernel.org>,
        samba-technical <samba-technical@lists.samba.org>
Subject: Re: reflink support and Samba running over XFS
Message-ID: <Y2qXLNM5xvxZHuLQ@jeremy-acer>
Reply-To: Jeremy Allison <jra@samba.org>
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On Mon, Nov 07, 2022 at 10:47:48PM -0800, Christoph Hellwig wrote:
>On Mon, Nov 07, 2022 at 04:53:42PM -0800, Jeremy Allison via samba-technical wrote:
>> ret = ioctl(fsp_get_io_fd(dest_fsp), BTRFS_IOC_CLONE_RANGE, &cr_args);
>>
>> what ioctls are used for this in XFS ?
>>
>> We'd need a VFS module that implements them for XFS.
>
>That ioctl is now implemented in the Linux VFS and supported by btrfs,
>ocfs2, xfs, nfs (v4.2), cifs and overlayfs.

I'm assuming it's this:

https://man7.org/linux/man-pages/man2/ioctl_ficlonerange.2.html

Yeah ? I'll write some test code and see if I can get it
into the vfs_default code.