FFS_ROOT is gone?

Tim Kientzle kientzle at acm.org
Tue Jul 15 12:19:37 PDT 2003

Harald Schmalzbauer wrote:
> The problem is solved. It was stupid, but I thought why should I have to set
> / in /etc/fstab when the filesystem isn't mounted yet, so the file can't be
> read.
> But it seems the kernel reads this file "loader-like" *before* the
> filesystem is mounted.

I believe that the loader actually reads this file (it
has to be able to locate and read files from UFS anyway
in order to load the kernel) and passes the root f/s
information to the kernel when it boots.  This should
probably be documented in fstab(5)

> Considering the above to be correct I can't understand the ability to enter
> e. g. ufs:/dev/ad0a at "mountroot>" when it doesn't work.

I've also been stung by the fact that the
"mountroot>" prompt is broken.  <sigh>
I looked briefly at the code, but the
bug is not particularly obvious.

Tim Kientzle

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