Re: How to quickly detect the mode change of a hard disk?

[Hui Cheng <hcheng@cse.unl.edu>]

On Sat, 19 Nov 2005, Pavel Machek wrote:
Hi,

> Hi!
>
> > > > > I am currently doing a kernel module involves detecting/changing
> > > > > disk mode among STANDBY and ACTIVE/IDLE. I used ide_cmd_wait() to issue
> > > > > commands like WIN_IDLEIMMEDIATELY and WIN_STANDBYNOW1. The problem is, a
> > > > > drive in standby mode will automatically awake whenever a disk operation
> > > > > is requested and I need to know the mode change as soon as possible. (So I
> > > >
> > > > AFAIK there's no nice way to get that info, but it is useful, so
> > > > patch would be welcome.
> > >
> > > I would check the hdparm man page again. Still, it sounds interesting.
> > >
> > > Additionally, it could be cool if someone could finish up or make the option
> > > for the HD freeze to use it with the HDAPS driver. ;-)
> > >
> > > .Alejandro
> > >
> >
> > Thanks for reply :) What I did to handle this problem is a little stupid
> > : Suppose the disk is now in a standby mode. In case that there is a
> > request sent to the disk drive, a kernel thread is awake to detect/update
> > the current disk power mode. The disk power mode is stored in the
> > ide_drive_t structure and be protected by lock. It seems to work fine in
> > my simple tests. But again, there should be better solutions.
>
> Can we get the patch?
> --

Sure. I will make the patch and test it again. But it may take a while
because I have an urgent task now...Thanks,

Hui

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