On Mon, 04 Nov 2013 10:07:22 +0000 Pádraig Brady <P@xxxxxxxxxxxxxx> wrote: > So cp --reflink has CoW semantics and so probably not an > appropriate interface for this. Unless I'm misunderstanding, > this SMB copy offload does result in a normal copy on the server right? It depends on how the SMB server interprets the copy-chunk wire request. On Btrfs, Samba can translate the request into a BTRFS_IOC_CLONE_RANGE ioctl, in which case the same CoW semantics are observed[1]. See: https://wiki.samba.org/index.php/Server-Side_Copy#Btrfs_Enhanced_Server-Side_Copy_Offload By default however, Samba (and Windows) will perform the copy on the server-side using regular reads/writes. A generic cp --offload or similar would probably make more sense on the client side. Cheers, David -- To unsubscribe from this list: send the line "unsubscribe linux-cifs" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
