linux-kernel - Re: What to do about the 2TB limit on HDIO

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Date:	Tue, 25 Mar 2008 09:37:29 -0400
From:	Mark Lord <lkml@....ca>
To:	"H. Peter Anvin" <hpa@...or.com>, Greg KH <gregkh@...e.de>
Cc:	Jens Axboe <axboe@...nel.dk>, Jeff Garzik <jgarzik@...ox.com>,
	Tejun Heo <htejun@...il.com>,
	Linus Torvalds <torvalds@...l.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linux Kernel <linux-kernel@...r.kernel.org>,
	IDE/ATA development list <linux-ide@...r.kernel.org>,
	linux-scsi <linux-scsi@...r.kernel.org>
Subject: Re: What to do about the 2TB limit on HDIO_GETGEO ?

H. Peter Anvin wrote:
> Mark Lord wrote:
>>
>> One candidate might seem to be the existing 
>> /sys/block/dev/partition/start
>> which I expect is already 64-bit friendly.
>>
>> But this requires about 150 lines of somewhat complex C code to access,
>> using only the dev_t (from stat(2) on a file) as a starting point,
>> or less if one relies upon the udev device name matching the sysfs 
>> device name.
>>
>> Is it time now for HDIO_GETGEO64 to make an appearance?
>> Similar to how the existing BLKGETSIZE64 is supplanting BLKGETSIZE ?
>>
> 
> Probably a better thing to have would be a way to look up block devices 
> in sysfs by device number.
..

Yeah, that would be just as good, really.  Maybe even better.

Mark Lord wrote (later on):
> Instead, software has to search everything inside /sys/block/
> looking for a "dev" file whose contents match,
> rather than just trying to access something like this:
> 
>   /sys/block/8:1/start
> or
>   /sys/block/majors/8/minors/1/start
> 
> Or any one of a number of similar ways to arrange it. 
..

Greg ?
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