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On Sat, Oct 18, 2003 at 08:32:14AM +0100, David Laight wrote:
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> But why should these values be stored in the disklabel, why not just
> pass them as parameters to newfs?

Because the disklabel is the only data store that exists above the fs.

> If you need to know the values for an existing filesystem, then ask the
> filesystem.  That way you get the correct values (eg from the superblock).

As before, what if you don't have a superblock anymore? :-)

Yes, it's rare, but we don't have a "find superblock" tool. Also, we need=
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some way to guard against incorrect data (like how do we not get confused=
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if we have a file on the fs that is itself a file system image? ;-) .

> newfs was recently changed (not by me) to ignore the cpg field from the
> disklabel - because it might contain garbage and cause the generated
> filesystem to have inappropriate parameters.  The value saved is also
> not the cpg (since 'cylinder groups' are no longer aligned to cylinder
> boundaries) but, IIRC, the bottom 8 bits of the number of cylinders.

Uhm, who gave us this redefinition mess?

Take care,

Bill

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