[PATCH] smb2 FSCTL_SRV_COPYCHUNK support

[Christian Ambach]

On 02/15/2012 02:05 PM, Volker Lendecke wrote:

> Ok, that might be fast enough to be done in a sync fashion.
> The default implementation though would probably do it via
> pread/pwrite which might be just slow enough to justify it
> to be done asynchronously.

MS-SMB2 3.3.4.2 (and product behavior <149>) says that servers should 
send an async interim response for FSCTL_SRV_COPYCHUNK or 
FSCTL_SRV_COPYCHUNK_WRITE so it might be a wise idea to have this 
available as async interface in VFS to make it easier to send out the 
interim responses in the SMB2 server code.

Cheers,
Christian