Re: struct backing_dev - purpose and life time rules

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On Wed, Jul 28, 2010 at 01:55, FUJITA Tomonori
<fujita.tomonori@xxxxxxxxxxxxx> wrote:
> Not a comment on the original topic,
>
> On Tue, 27 Jul 2010 16:09:47 +0200
> Christoph Hellwig <hch@xxxxxx> wrote:
>
>> On Tue, Jul 27, 2010 at 09:39:56AM -0400, Vivek Goyal wrote:
>> > How can I do it better?
>> >
>> > I needed a unique identifier with which user can work in terms of
>> > specifying weights to devices and in terms of understanding what stats
>> > mean. Device major/minor number looked like a obivious choice.
>> >
>> > I was looking for how to determine what is the major/minor number of disk
>> > request queue is associated with and I could use bdi to do that.
>>
>> The problem is that a queue can be shared between multiple gendisks,
>
> Is anyone still doing this?
>
> I thought that everyone agreed that this was wrong. Such users (like
> MTD) were fixed.

I think it was MTD, which is fixed, and floppy, which is still the way it was.

Kay
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