now it is ok, no more processes running and nobody accessing /myrep

I tried:

mount -F lofs -o rw /myrep /my_image_rep

-> Device busy (but nothing in fuser or lsof)

I tried several ways being at the same level than my_image_rep, being one rep higher and doing it like mount -F lofs -o rw /myrep rep_higher/my_image_rep

obtaining results like
mount: mount-point my_image_rep is not an absolute pathname.

mount: mount-point /my_image_rep does not exist.

and also every way of umount including with the -f option on what is in my mnttab (concerning /myrep)

I think I will end to rebuild the package I try to deploy using another directory than the one actually declared (my_image_rep)

but it will not fix the ro state of the actual my_rep_image in which I also have other packages installed (meaning that the other softwares will have troubles)

one colleague of mines suggest me to edit mnttab directly and to change ro in rw, any chance to succeed that way?