Re: [PATCH] remove 2TB block device limit

[Neil Brown]

On Friday May 10, [e-mail] wrote:
> 
> Hi,
> 	At present, linux is limited to 2TB filesystems even on 64-bit
> systems, because there are various places where the block offset on
> disc are assigned to unsigned or int 32-bit variables.
> 
> There's a type, sector_t, that's meant to hold offsets in sectors and
> blocks.  It's not used consistently (yet).
> 
> The patch at
>     http://www.gelato.unsw.edu.au/patches/2.5.14-largefile-patch

> 
> As this touches lots of places -- the generic block layer (Andrew?)
> the IDE code (Martin?) and RAID (Neil?) and minor changes to the scsi
> I've CCd a few people directly.
> 

Thanks.
MD part looks sane to me. However I would rather the
 
+#ifdef CONFIG_LFS
+#include <asm/div64.h>
+#else
+#undef do_div
+#define do_div(n, b)({ int _res; _res = (n) % (b); (n) /= (b); _res;})
+#endif
+

part went in linux/raid/md_k.h and defined "sector_div" (or similar)
as either do_div or ({ int _res; _res = (n) % (b); (n) /= (b); _res;})
as appropriate.

NeilBrown