On Sat, Mar 11, 2017 at 02:54:45PM +0000, Sam Bull wrote: > I'm getting an error when trying to send a subvolume. I only seem to be > able to do this as root. The subvolume was created by the user account, > and not root. Could anybody shed some light on why this is failing? Is > there a way to get it working? > > $ btrfs send /var/spool/backups/hacking/2017-03-10 > something > ERROR: cannot open '/': Operation not permitted
The send operation for non-root would need a full evaluation whether it does not cross the permissions/security boundaries. > Also appears I cannot even use btrfs subvolume show: > > $ btrfs subvolume show /var/spool/backups/hacking/2017-03-10 > ERROR: can't perform the search - Operation not permitted > ERROR: can't find 'var/spool/backups/hacking/2017-03-10' The reason here is that the TREE_SEACH ioctl is used, that gives full access to the internal structures and therefore is root-only. Many 'btrfs' subcommands utilize the flexibility of the ioctl as we don't have tons of specialized ioctls, but this comes at some cost. -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
