Re: [Ext2-devel] [RFC 0/13] extents and 48bit ext3

[Jeff Garzik]

Laurent Vivier wrote:
> Qi Yong wrote:
> > Linus Torvalds wrote:
> >
> > > On Fri, 9 Jun 2006, Stephen C. Tweedie wrote:
> > >  
> > >
> > > > When is the Linux syscall interface enough?  When should we just bump it
> > > > and cut out all the compatibility interfaces?
> > > >
> > > > No, we don't; we let people configure certain obsolete bits out (a.out
> > > > support etc), but we keep it in the tree despite the indirection cost to
> > > > maintain multiple interfaces etc.
> > > >    
> > > Right. WE ADD NEW SYSTEM CALLS. WE DO NOT EXTEND THE OLD ONES IN WAYS THAT 
> > > MIGHT BREAK OLD USERS.
> > >
> > > Your point was exactly what?
> > >
> > > Btw, where did that 2TB limit number come from? Afaik, it should be 16TB 
> > > for a 4kB filesystem, no?
> > >  
> > Partition tables describe partitions in units of one sector.
> > 2^(32+9) = 2T
> >
> > To prevent integer overflow, we should use only 31 bits of a 32-bit integer.
> > 2^(31+12) = 8T
> >
> > There's _terrible_ hacks to really get to 16T.
> >
> > -- qiyong
>
> IMHO, a simple solution is to use "Logical Volume Manager" instead of partition
> manager: we create 64bit filesystem in a Logical Volume, not in a partition.

That doesn't solve anything, if you are not using a 64bit filesystem.


> "partitioning is obsolete" ;-)

LVM is nothing but a partition manager...

	Jeff



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