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