On Thu, Aug 08, 2019 at 12:09:11PM -0500, David Wright wrote: > But the 2-1 vote wasn't whether error messages were emitted, but > whether the system should mount an already-mounted partition onto > another mount point. I get error messages and the mount fails. > Others get no error messages (though they haven't demonstrated > the lack) and a successful mount, so currently I'm in a minority > of one.
It may very well depend on the version of Debian, the kernel, the mount package, the type of file system... I don't know. I was utterly surprised when I got the result that I got, because I really did expect it to fail with an error message. I was in the process of writing an email reply of the form "you can't do that, you have to use --bind or something". I tested it out, so I could paste the results into the email... and... this. Here's what I get, on buster, amd64, standard 4.19 kernel, standard mount package, ext4 file system, no encryption, no LVM, no mdraid. wooledg:~$ df Filesystem 1K-blocks Used Available Use% Mounted on udev 4007532 0 4007532 0% /dev tmpfs 804828 2432 802396 1% /run /dev/sda6 187064220 19717412 157821460 12% / tmpfs 4024136 130088 3894048 4% /dev/shm tmpfs 5120 0 5120 0% /run/lock tmpfs 4024136 0 4024136 0% /sys/fs/cgroup /dev/sda3 2818080 80600 2574616 4% /boot tmpfs 804824 12 804812 1% /run/user/563 wooledg:~$ sudo mount /dev/sda3 /mnt [sudo] password for wooledg: wooledg:~$ df Filesystem 1K-blocks Used Available Use% Mounted on udev 4007532 0 4007532 0% /dev tmpfs 804828 2432 802396 1% /run /dev/sda6 187064220 19717412 157821460 12% / tmpfs 4024136 130068 3894068 4% /dev/shm tmpfs 5120 0 5120 0% /run/lock tmpfs 4024136 0 4024136 0% /sys/fs/cgroup /dev/sda3 2818080 80600 2574616 4% /mnt tmpfs 804824 12 804812 1% /run/user/563 wooledg:~$ ls /mnt config-4.19.0-5-amd64 initrd.img-4.9.0-8-amd64 vmlinuz-4.19.0-5-amd64 config-4.9.0-8-amd64 lost+found vmlinuz-4.9.0-8-amd64 grub System.map-4.19.0-5-amd64 initrd.img-4.19.0-5-amd64 System.map-4.9.0-8-amd64 wooledg:~$ ls /boot config-4.19.0-5-amd64 initrd.img-4.9.0-8-amd64 vmlinuz-4.19.0-5-amd64 config-4.9.0-8-amd64 lost+found vmlinuz-4.9.0-8-amd64 grub System.map-4.19.0-5-amd64 initrd.img-4.19.0-5-amd64 System.map-4.9.0-8-amd64 wooledg:~$ sudo umount /mnt wooledg:~$ df Filesystem 1K-blocks Used Available Use% Mounted on udev 4007532 0 4007532 0% /dev tmpfs 804828 2432 802396 1% /run /dev/sda6 187064220 19717412 157821460 12% / tmpfs 4024136 130068 3894068 4% /dev/shm tmpfs 5120 0 5120 0% /run/lock tmpfs 4024136 0 4024136 0% /sys/fs/cgroup /dev/sda3 2818080 80600 2574616 4% /boot tmpfs 804824 12 804812 1% /run/user/563 wooledg:~$ ls /mnt wooledg:~$
