Re: [PATCHSET] libata: improve ATA ACPI support

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



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
-
To unsubscribe from this list: send the line "unsubscribe linux-ide" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html

[Index of Archives]     [Linux Filesystems]     [Linux SCSI]     [Linux RAID]     [Git]     [Kernel Newbies]     [Linux Newbie]     [Security]     [Netfilter]     [Bugtraq]     [Yosemite News]     [MIPS Linux]     [ARM Linux]     [Linux Security]     [Samba]     [Device Mapper]

  Powered by Linux