On 16/10/17 14:28, David Sterba wrote: > On Sun, Oct 15, 2017 at 04:19:23AM +0300, Cerem Cem ASLAN wrote: >> `btrfs send | btrfs receive` removes NOCOW attributes. Is it a bug or >> a feature? If it's a feature, how can we keep these attributes if we >> need to? > > This is a known defficiency of send protocol v1. And there are more, > listed on > https://btrfs.wiki.kernel.org/index.php/Design_notes_on_Send/Receive#Send_stream_v2_draft It is not mentioned on the list (and I haven't tested to find out)... but if xattr are supported in the V1 protocol, any chance of `send` converting these file flags to xattr, and `receive` converting back? No need for a protocol bump and would even preserve the information (although not the effect) in the case of an old receiver. -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
