Re: [Ext2-devel] [RFC 0/13] extents and 48bit ext3
Qi Yong <[email protected]>
| Newsgroups | gmane.linux.file-systems,gmane.comp.file-systems.ext2.devel,gmane.linux.kernel |
|---|---|
| Organization | FCD |
| Message-ID | <[email protected]> |
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 - To unsubscribe from this list: send the line "unsubscribe linux-fsdevel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html