On Sunday 30 August 2009 21:28, walter harms wrote:
>
> walter harms schrieb:
> >
> > Matthew Stoltenberg schrieb:
> >>>>> and sfdisk is a very nice tool to create partitions from scripts. beats
> >>>>> parted.
> >> agreed... sfdisk is nice for scripted installs... I would be willing
> >> to do a bit of testing for this.
> >>
> >>>> our fdisk should be massaged into an sfdisk. Would be handy IMHO,
> >>>> agreed.
> >>> interessting would be a tools that can handle disk >2TB. fdisk (and
> >>> friends) cannot
> >>> if i am informed correctly. This will make BB interessting for SAN.
> >> really? I think it wouldn't be that hard to use long long for pointers...
> >>
> >> course, on top of all this, we still would need a utility to put a
> >> filesystem on there since e2fsutils got pulled from the package.
> >>
> >
> > The partition schema has problems with >2TB, so there is more that simply
> > using a larger datatype,
> > 2 TB is restriction of DOS partiton format.
> >
> > see here and others:
> > *
> > http://www.cyberciti.biz/tips/fdisk-unable-to-create-partition-greater-2tb.html
> >
>
> I drop over an article concerning the >2TB problem:
> http://www.ibm.com/developerworks/linux/library/l-gpt/index.html
> it mention an GPT aware fdisk (aka gdisk).
> http://sourceforge.net/projects/gptfdisk/files/
>
> maybe some will take a look a gdisk.
For now, I am adding a warning so that we can at least
work correctly with 1st 2TB of such big devices:
+static sector_t bb_BLKGETSIZE_sectors(int fd)
{
uint64_t v64;
unsigned long longsectors;
if (ioctl(fd, BLKGETSIZE64, &v64) == 0) {
/* Got bytes, convert to 512 byte sectors */
- return (v64 >> 9);
+ v64 >>= 9;
+ if (v64 != (sector_t)v64) {
+ ret_trunc:
+ /* Not only DOS, but all other partition tables
+ * we support can't record more than 32 bit
+ * sector counts or offsets
+ */
+ bb_error_msg("device has more than 2^32 sectors, can't
use all of them");
+ v64 = (uint32_t)-1L;
+ }
+ return v64;
}
/* Needs temp of type long */
if (ioctl(fd, BLKGETSIZE, &longsectors))
longsectors = 0;
+ if (sizeof(long) > sizeof(sector_t)
+ && longsectors != (sector_t)longsectors
+ ) {
+ goto ret_trunc;
+ }
return longsectors;
}
--
vda
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