Date: Wed, 16 Feb 2000 09:03:37 +0800 From: Peter Wemm <peter@netplex.com.au> To: Matthew Dillon <dillon@apollo.backplane.com> Cc: John Milford <jwm@CSUA.Berkeley.EDU>, Joe Greco <jgreco@ns.sol.net>, hackers@FreeBSD.ORG Subject: Re: Filesystem size limit? Message-ID: <20000216010337.5F6321CDB@overcee.netplex.com.au> In-Reply-To: Message from Matthew Dillon <dillon@apollo.backplane.com> of "Tue, 15 Feb 2000 16:25:11 PST." <200002160025.QAA46340@apollo.backplane.com>
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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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