Hi,
On Tuesday 24 April 2007, Mark Lord wrote:
> Tejun Heo wrote:
> >
> > of the time. I think HDIO_GET_IDENTITY's meaning is something like
> > "give me IDENTIFY page of the device as seen by the driver" and doesn't
> > really matter as long as it can be used to get general idea about the
> > device.
>
> The correct/original meaning of that ioctl was "boot time IDENTIFY" data.
> As Alan said, it later got bastardized by various people at some point.
It got de-bastardized later :) and currently HDIO_GET_IDENTITY seems to be
returning "boot time IDENTIFY" with only two exceptions:
* if ID can't be read et all - fake geometry with user supplied values
to make things work - this is OK (was added by Alan IIRC)
* id->dma_{1word,mword,ultra} (currently selected DMA transfer modes)
are updated when the current transfer mode changes - this is of least
importance than capacity/geometry data (since nowadays all speed tuning
should be done by kernel anyway) and easy to fix once DMA rewrite patches
from my tree get merged
Thanks,
Bart
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