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

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Message-ID: <4804B1E0.10200@rtr.ca>
Date:	Tue, 15 Apr 2008 09:47:12 -0400
From:	Mark Lord <liml@....ca>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Dan Williams <dan.j.williams@...el.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	Kay Sievers <kay.sievers@...y.org>,
	Tejun Heo <htejun@...il.com>, Mark Lord <lkml@....ca>,
	Greg KH <gregkh@...e.de>, Jens Axboe <axboe@...nel.dk>,
	Jeff Garzik <jgarzik@...ox.com>,
	Linus Torvalds <torvalds@...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 ?

Andrew Morton wrote:
> On Fri, 11 Apr 2008 16:25:32 -0700 "Dan Williams" <dan.j.williams@...el.com> wrote:
> 
>>>  It doesn't really seem to be to belong under class at all.  I would suggest
>>> /sys/dev/char/ and /sys/dev/block/, for char and block respectively.
>>>
>> This thread fizzled out without a patch... here goes:
>>
>> ...
>>
>> sysfs: add /sys/dev/{char,block} to lookup sysfs path by major:minor
> 
> Crickets are chirping and I can't remember what the conclusion to all this
> was.  In fact the thread was more than ten-deep so I probably fell asleep.
..

Last I recall, Greg was vehemently opposed to having direct path access
by device number in sysfs, but many other people saw benefit.

Myself (the originator), I simply decided that my sysfs access code has
to work with older kernels too, so for now I'm just doing a brute force
tree search to find things in sysfs.  I did get the code size down smaller
for it, but it's still a pain.

When the direct access feature goes in, I'll just change my code to try it first,
and then still fall back to the tree search method on failure.

> I queued it up so that others cannot do the same ;)
..

Good!
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