On Tue, Feb 06, 2024 at 03:18:48PM -0500, Kent Overstreet wrote: > previous: > https://lore.kernel.org/linux-fsdevel/20240206-aufwuchs-atomkraftgegner-dc53ce1e435f@brauner/T/ > > Changes since v1: > - super_set_uuid() helper, per Dave > > - nix FS_IOC_SETUUID - Al raised this and I'm in 100% agreement, > changing a UUID on an existing filesystem is a rare operation that > should only be done when the filesystem is offline; we'd need to > audit/fix a bunch of stuff if we wanted to support this NAK. First, this happens every single time a VM in the cloud starts up, so it happens ZILLIONS of time a day. Secondly, there is already userspace programs --- to wit, tune2fs --- that uses this ioctl, so nixing FS_IOC_SETUUID will break userspace programs. - Ted
