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SubjectRe: elvtune fails with DAC960 and devfs on 2.4.14
On Tue, 13 Nov 2001, Brian Ristuccia wrote:

> I can't seem to adjust the elevator parameters for this block device, but
> can't:
> # elvtune /dev/rd/disc0/disc
> ioctl get: Invalid argument

DAC960.c doesn't know about BLKELVSET / BLKELVGET, and control is
only passed down to the generic ioctl in the case of BLKBSZSET,
and doesn't have a default: entry in the switch statement of

I've not seen one of these devices, so I'm not sure if this makes
sense or not, but passing on requests to the lower level should
be a simple..

return( blk_ioctl(Inode->i_rdev, Request, Argument));


There may be other reasons this driver doesn't provide the
elevator ioctls though.



| Dave Jones.
| SuSE Labs

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