Re: Filesystem size limit?

[Peter Wemm]

Matthew Dillon wrote:
> :>
> :> ie: there is a signed 32 bit sector count limit.  2^31 == 1TB.  It shouldn
    't
> :> be too hard to get it to create 2^32 bit (2TB) filesystem though.  I'd exp
    ect
> :> there to be more problems that this to bite you though. :-(
> :>
> :> 2^31 also happens to be the mmap() file offset limit FWIW.
> 
>     No it isn't.  mmap() (under FreeBSD) takes an off_t for the file offset,
>     so the file offset limit is 2^63.  The size of your map is limited to
>     the size of the user address space minus things already mapped -- 
>     around 3 GB on IA32.

Sorry, my comment was ambigious.  mmap(2) is 64 bit aware at the syscall level,
but it's the file and device backing that is limited to 2^31 blocks (as you
confirmed before).

Cheers,
-Peter




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