Re: [PATCH v4 01/43] hpsa: add masked physical devices into h->dev[] array

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On 04/16/2015 03:46 PM, Don Brace wrote:
> From: Stephen Cameron <stephenmcameron@xxxxxxxxx>
>
> Cache the ioaccel handle so that when we need to abort commands sent
> down the ioaccel2 path, we can look up the LUN ID in h->dev[] instead of
> having to do I/O to the controller.
>
> Add a field to elements in h->dev[] to keep track of how the device is exposed
> to the SCSI mid layer: Not at all, without an upper level driver
> (no_uld_attach) or normally exposed.
>
> Since masked physical devices are now present in h->dev[] array
> it would be perfectly possible to do
>
> 	echo scsi add-single-device 2 2 0 0 > /proc/scsi/scsi
>
> and bring them online.  This was previously not allowed for masked
> physical devices.
>
> Ensure that the mapping of physical disks to logical drives gets updated in a
> consistent way when a RAID migration occurs and is not touched until updates
> to it are complete.
>
> now instead of doing CISS_REPORT_PHYSICAL to get the LUNID for
> the physical disk in hpsa_get_pdisk_of_ioaccel2(), just get
> it out of h->dev[] where we already have it cached.
>
> do not touch phys_disk[] for ioaccel enabled logical drives during rescan
>
> Reviewed-by: Scott Teel <scott.teel@xxxxxxxx>
> Reviewed-by: Kevin Barnett <kevin.barnett@xxxxxxxx>
> Signed-off-by: Don Brace <don.brace@xxxxxxxx>

Reviewed-by: Tomas Henzl <thenzl@xxxxxxxxxx>

Tomas

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