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SubjectRe: Migrating to larger numbers
> 	If the dev is too big for the current format, stick -1 in the 
> block pointer used by the current format, and use the N (for
> 1 <= N <= 4, depending on the filesystem) subsequent block
> pointers to hold the real device number.)
> I suggest, as you say, a 32:32 split (it's simple).

64bit dev_t's are going to cause some real problems. I would suggest you
try passing a 64bit dev_t over NFS - especially to non unix clients before
you do this.

If you go to a 64bit dev_t you will have to do hackish horrors for NFS support
even Linux to Linux. Stay with a 32bit dev_t, supporting more device files
than we can create 1 a second within our epoch is crazy


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