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
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