Re: IBM HDAPS things are looking up

Lenz Grimmer
2005-07-04T13:34:38Z

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Hi Jens!

Thanks for the sample code. I've trimmed the recipient list a bit...

Jens Axboe wrote:

> Perhaps the IDLE or IDLEIMMEDIATE commands imply a head parking, that
> would make sense. As you say, you can hear a drive parking its head.
> Here's a test case, it doesn't sound like it's parking the hard here.

Not here either, but let me check, if I understand this correctly:

> #include <stdio.h>
> #include <unistd.h>
> #include <fcntl.h>
> #include <sys/ioctl.h>
> #include <linux/hdreg.h>
>
> int main(int argc, char *argv[])
> {
> char cmd[4] = { 0xe1, 0, 0, 0 };

The "0xe1" in here is what is defined as "WIN_IDLEIMMEDIATE" in hdreg.h,
correct?

> int fd;
>
> if (argc < 2) {
> printf("%s <dev>\n", argv[0]);
> return 1;
> }
>
> fd = open(argv[1], O_RDONLY);

Hmm, don't I need to actually have *write* access for sending an ioctl?

> if (fd == -1) {
> perror("open");
> return 1;
> }
>
> if (ioctl(fd, HDIO_DRIVE_CMD, cmd))
> perror("ioctl");
>
> close(fd);
> return 0;
> }

I will give it another try, after clarifying the above questions - maybe
there is a command that will perform the desired task. If not, I guess
we're back at snooping what the Windows driver does here...

Bye,
LenZ
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