Hewlett-packard Development Company, L.P.

David Pevton Cox

Nick E Demmon

Shawn Erickson

A method, used while building in processor memory a stack of device objects (DOs) representing a device, there being a multi-role driver for a plurality of roles at least one of which corresponds to the device, may include: registering a plurality of helper drivers so as to uniquely correspond to the plurality of roles, respectively, each helper driver mapping uniquely to one of the multiple roles of the multi-role driver, respectively; and indirectly specifying a corresponding one of the multiple roles of the multi-role driver by specifying the helper driver mapped thereto. A related apparatus and machine-readable medium bearing machine-readable instructions may include features similar to elements of the method.

Using helper drivers to build a stack of device objects

In the method, a logical unity is queried with a first command requesting first identifier data, to determine whether a unique identifier (UID) for the logical unit can be constructed based on the first identifier data. If a UID cannot be constructed from the first identifier data, the logical unit is queried with a second command requesting second identifier data, to determined if a UID can be constructed based on the second identifier data. If a UID cannot be constructed based on the second identifier data, the logical unit is queried with a third command requesting third identifier data. Information is extracted from the first identifier data and from the third identifier data and a UID is generated based on the extracted information.

Method and arrangement for generating unique identifiers for logical units of SCSI devices

A filter driver code arrangement (on a computer-readable medium for use in a system having a bus, a host connected to the bus and one or more devices connected to the bus), which prevents access by the host to any of the devices for which the host does not have respective access permission. Such a filter driver includes: an intercept code portion to intercept a set of data identifying one or more devices connected to the bus, respectively; a determination code portion to determine, based upon the data set and a permission set representing permission relationships between the host and the one or more devices, whether the host has permission to access each of the one or more devices; and a change code portion to change the data set to block access by the host to any of the one or more devices for which the host does not have access permission.

Growing community of inventors

Santa Barbara, CA, United States of America

David Pevton Cox