Why doesn’t mount respect the read only option for bind mounts?
On my Arch Linux system (Linux Kernel 3.14.2) bind mounts do not respect the read only option
bind-mount
Unmount a rbind mount without affecting the original mount
Asked on serverfault but didn’t get enough attention, so reposted here, with the hope some people here know the answer.
Mounting new filesystem affects non-recursive bind mounts?
It hasn’t always behaved this way, but nowadays I get this inconsistent behaviour. Bind mounts don’t copy existing mounts (unless you use --rbind), but new mounts (and unmounts) get copied automatically. It seems like a bug. What causes this?