Re: PATCH: Support tera byte disk

From: Andreas Dilger (
Date: Wed Sep 18 2002 - 15:32:47 EST

On Sep 18, 2002 13:11 -0700, H. J. Lu wrote:
> For a 1.8TB SCSI HD, kernel reports:
> SCSI device sda: -773086208 512-byte hdwr sectors (-395819 MB)
> Here is a patch to fix it. BTW, I don't think it will work with > 2TB,
> which requires bigger changes.

There's also a limit where statfs() overflows at 16TB for 4kB block
filesystems... Ask me how I noticed this ;-)

Luckily, it is easy to upshift f_blksz and downshift f_blocks, f_bfree,
and f_bavail to get the data through the statfs interface, and df does
the reverse on the other side. It makes sense to show a larger block
size anyways, so apps potentially do larger I/O requests.

Cheers, Andreas

Andreas Dilger

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