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Author: Didier Kryn
Date:  
To: dng
Subject: Re: [DNG] FW: support for merged /usr in Debian
Le 04/01/2016 07:22, Steve Litt a écrit :
> If you didn't merge /lib and /usr/lib, you could load them from /lib
> once the root partition was mounted. This was my entire point.


     OK. I think I got it. Sorry, I was slow. So this is the case:


     - No initramfs, direct boot to the final rootfs (meaning disk 
drivers and filesystem built in the kernel),
     - /usr is on a partition per se,
     - the file-system of /usr is not the same as / (eg jffs2 for / and 
ext4 for /usr)
     - the file-system of /usr is not built-in (eg only jffs2 built-in).


     Then I agree that startup is impossible if the modules are under 
/usr. However, cumulating all these condidions is a corner case. And not 
all these conditions are imposed from outside; most of them are decided 
by the person who makes the install.


     Having /usr in a partiton different of / made sense in the time of 
unsafe filesystem, because there was more chance to corrupt /usr than /. 
But this is the past now. I've watched a hundredth of brutal power down 
on servers with reiserfs and btrfs filesystems, and zero filesystem 
corruption after I abandonned ext2 ~7 years ago. I confess I still use 
to mount /usr on a partition per se, but I think it has become just a 
habit which makes no sense anymore and I'm going to stop it.


      Didier