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  • If /proc/self/mountinfo can contain lines like 2 1 8:1 /a /b rw - ext4 /dev/sda1 rw,errors=remount-ro, then Linux most certainly does keep some information about bind mounts. Commented Feb 28, 2017 at 20:59
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    No. Look at my second example. It keeps the information which filesystem was mounted and which path relative to the filesystem root was mounted. So for mount --bind /home/melab /mnt the resulting line might look like any of the following depending on which of /home and /home/melab is a mountpoint: 3 1 8:1 /home/melab /mnt rw - ext4 /dev/sda1 rw, 3 1 8:2 /melab /mnt rw - ext4 /dev/sda2 rw, 3 1 8:3 / /mnt rw - ext4 /dev/sda3 rw Commented Feb 28, 2017 at 21:11
  • It's true that something different to / in the fourth column often indicates a bind mount. But it also might be a Btrfs subvolume. Commented Feb 28, 2017 at 21:36
  • Is /dev/sda3 supposed to be mounted at /home/melab? Commented Mar 3, 2017 at 2:00
  • Yes. In my example I used /dev/sda1 as /, /dev/sda2 as /home and /dev/sda3 as /home/melab Commented Mar 3, 2017 at 13:09