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I was hoping to be able to be able to mount /dev/sdb1 for reading writing through /mnt/3 and for reading only through /home/ftp. Unfortunately, it doesn't work. After mount, I have rw access to both. After, googling, I came across some discussion that this functionality is being added to the kernel, but the discussion was a bit technical for me.
Those are good points but this isn't really an ftp issue. I don't even have an ftp daemon running right now. I was hoping to get the directory to mount as read only while still being read-write when mounted as another directory. This is because I'm going to chroot into /home.
In general it would be nice to be able to mount partitions with different read-write permissions depending on where they are mounted.
I.e. mount --bind -r dir1 dir2
should not allow write access to dir2 no matter the mount permissions of dir1.
I thought '--bind -r' would work but you are right - it does not make it read only. I never tried it before but now that I tested this it does not mount it read only but rather it ignores the read-only parameter.