On 02/04/2014 03:52 PM, Kai Krakow wrote:
Hi! I'm curious... The whole snapshot thing on btrfs is based on its COW design. But you can make individual files and directory contents nocow by applying the C attribute on it using chattr. This is usually recommended for database files and VM images. So far, so good... But what happens to such files when they are part of a snapshot? Do they become duplicated during the snapshot? Do they become unshared (as a whole) when written to? Or when the the parent snapshot becomes deleted? Or maybe the nocow attribute is just ignored after a snapshot was taken? After all they are nocow and thus would be handled in another way when snapshotted.
When snapshotted nocow files fallback to normal cow behaviour. Thanks, Josef -- 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
