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. "partitioning is obsolete" ;-) Regards, Laurent -- Laurent Vivier Bull, Architect of an Open World (TM) http://www.bullopensource.org/ext4
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