Arch Linux

I built an archiso image as described in the wiki https://wiki.archlinux.org/index.php/Archiso .
When performing a bind mount, strange things happen.
Firstly, the "mount" command produces information about the bind mount as if it were a real, physical disk.
Secondly, when remounting the bind mount read-only, the "parent" mount is also affected.
See below. I have only included the relevant parts from the output of the "mount" command.


root ~ # pacman -Q linux
linux 3.0.7-1



root ~ # mount
proc on /proc type proc (rw,nosuid,nodev,noexec,relatime)
sys on /sys type sysfs (rw,nosuid,nodev,noexec,relatime)
udev on /dev type devtmpfs (rw,nosuid,relatime,size=10240k,nr_inodes=78273,mode=755)
run on /run type tmpfs (rw,nosuid,nodev,relatime,size=10240k,mode=755)
/dev/mapper/arch_root-image on / type ext4 (rw,relatime,user_xattr,acl,barrier=1)
/dev/mapper/arch_lib-modules on /lib/modules type ext4 (rw,relatime,user_xattr,acl,barrier=1)
/dev/mapper/arch_usr-share on /usr/share type ext4 (rw,relatime,user_xattr,acl,barrier=1)
/dev/disk/by-label/ARCH_201110 on /bootmnt type iso9660 (ro,relatime)
devpts on /dev/pts type devpts (rw,nosuid,noexec,relatime,gid=5,mode=620,ptmxmode=000)
shm on /dev/shm type tmpfs (rw,nosuid,nodev,relatime)
tmpfs on /tmp type tmpfs (rw,nosuid,nodev,relatime)



root ~ # mount /dev/sda1 /home/



root ~ # mount
...
/dev/sda1 on /home type ext4 (ro,relatime,user_xattr,acl,barrier=1,data=ordered)



root ~ # mkdir /home/test_1 /home/test_1/sub_1



root ~ # ls /home/test_1/
sub_1



root ~ # mkdir /mnt/bindmount



root ~ # ls /mnt/
bindmount



root ~ # mount --bind /home/test_1/ /mnt/bindmount/



root ~ # mount
...
/dev/sda1 on /home type ext4 (rw,relatime,user_xattr,acl,barrier=1,data=ordered)
/dev/sda1 on /mnt/bindmount type ext4 (rw,relatime,user_xattr,acl,barrier=1,data=ordered)

# ERROR: Here, it should report:
# /home/test_1 on /mnt/bindmount type none (rw,bind)



root ~ # ls /mnt/bindmount/
sub_1



root ~ # mount /mnt/bindmount/ -o remount,ro



root ~ # mount
...
/dev/sda1 on /home type ext4 (ro,relatime,user_xattr,acl,barrier=1,data=ordered)
/dev/sda1 on /mnt/bindmount type ext4 (ro,relatime,user_xattr,acl,barrier=1,data=ordered)