I think it would not matter which ioctl is used if the target file is
not opened with flag O_RDWR.
Perhaps cifs.ko can make the decision to change O_WRONLY
to O_RDWR based on the flag and location of the source and
destination files.
On Thu, Oct 17, 2013 at 5:45 AM, David Disseldorp wrote:
> On
On Wed, 16 Oct 2013 18:36:19 -0500
Steve French wrote:
> cp --reflink opens the target file for O_WRONLY before invoking the
> (BTRFS) ioctl for clone file, but for copy offload over the network
> the SMB2 specification requires that the target file be open O_RDWR.
>
> I may be able to upgrade t
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