On Wed, Nov 08, 2023 at 09:22:33AM +0100, Christian Brauner wrote: > > /mnt/1/foo to /mnt/2/bar will get your dev 8 for /mnt/2/bar > > > > So the device number changes at the mount point here, bind mount or not. > > Yes, I know. But /mnt/2/ will have the device number of the > superblock/filesystem it belongs to and so will /mnt/1. Creating a > bind-mount won't suddenly change the device number and decoupling it > from the superblock it is a bind-mount of. It doesn't any more then just changing st_dev. But at least it aligns to the boundary that such a change always aligned to in not just Linux but most (if not all?) Unix variants and thus where it is expected.
