Hi, As far as my understanding of bind mounts is, that they get the mount options of the source and cannot have different mount options. This is what is stated in mount(2): "The filesystemtype, mountflags, and data arguments are ignored." Lets say we have /test and bind mount it to /mnt # mount --bind /test /mnt # mount /test on /mnt type none (rw,bind) Now some people have the idea to do the bind mount read-only, of course this is not possible since the mount syscall ignores additional options. But: # mount --bind -r /test /mnt # mount /test on /mnt type none (ro,bind) The mount *program* thinks the mount is ro, which is opposite to what /proc/mounts states: # cat /proc/mounts /dev/sda3 /mnt ext3 rw,data=ordered 0 0 We cannot just ignore additional options in mount, because the source could have been mounted with different options (e.g. ro). I think we will have to clone the options of the source in case of bind mounts. Matthias - To unsubscribe from this list: send the line "unsubscribe util-linux-ng" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
