linux-kernel - Re: [PATCH] scsi/sd: Fix capacity output to show MB/GB/TB/...

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Sat, 30 Aug 2008 20:59:07 -0500
From:	James Bottomley <James.Bottomley@...senPartnership.com>
To:	Simon Arlott <simon@...e.lp0.eu>
Cc:	Matthew Wilcox <matthew@....cx>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	linux-scsi <linux-scsi@...r.kernel.org>
Subject: Re: [PATCH] scsi/sd: Fix capacity output to show MB/GB/TB/...

On Sat, 2008-08-30 at 22:03 +0100, Simon Arlott wrote:
> The capacity printk'd in bytes is divided by 1000000,
> whereas 1048576 would be more consistent with the rest
> of the OS and disk-related utilities ('df' etc.).
> 
> This change replaces the (sz - (sz/625 - 974))/1950
> calculation with a simple right shift to output with
> five significant digits the capacity in KB, MB, GB, TB,
> PB, or EB. Anything beyond this becomes too large...

Well, still needs to be dividing by 1000 not 1024 for SCSI and ATA.
However, I'm afraid it needs to be a bit more sophisticated:  for
instance, under these calculations, a 1.75TB disk will show up as 1TB.
Thus, I think we need to print the capacity to 3 significant figures to
cope with this case.

James


--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/