19.10.2016 20:04, Hugo Mills пишет: > On Wed, Oct 19, 2016 at 07:52:14PM +0300, Andrei Borzenkov wrote: >> I get "Failed to clone: Invalid cross-device link". Is it expected? >> Basically this is (on openSUSE TW which has root on subvolume) >> >> mount -o subvol=/ /dev/vda1 /mnt >> btrfs sub create /mnt/var/cache >> cp -a --reflink=always /var/cache/* /mnt/var/cache >> >> Kernel 4.7.5-1-default. > > Yes, you're trying to copy across a mountpoint boundary. This isn't > going to work. You'll need to mount subvolid=0 on /mnt, and then use > the source and target of the cp *both* from within the /mnt subtree. > > Reflink operations (including cp --reflink=always, and the > reflink-aware mv) work across subvol boundaries, but not mount > boundaries. > > Hugo. > Yes, figured that much too. Thank you!
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