On Thu, Jul 15, 2021 at 01:11:29PM -0400, Josef Bacik wrote: > Because there's no alternative. We need a way to tell userspace they've > wandered into a different inode namespace. There's no argument that what > we're doing is ugly, but there's never been a clear "do X instead". Just a > lot of whinging that btrfs is broken. This makes userspace happy and is > simple and straightforward. I'm open to alternatives, but there have been 0 > workable alternatives proposed in the last decade of complaining about it. Make sure we cross a vfsmount when crossing the "st_dev" domain so that it is properly reported. Suggested many times and ignored all the time beause it requires a bit of work.