Patents by Inventor Alan B. Langerman

Alan B. Langerman has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Protected control of devices by user applications in multiprogramming environments
    Patent number: 6751680
    Abstract: A user program directly accesses a storage device for I/O operations, bypassing the operating system. The user registers a virtual memory region and an “extent”, or region, of the storage device with a host bus adapter. A virtual interface is created between the user and the storage device including a queue for transmitting commands from the user to the storage device. To perform I/O, the user creates a descriptor including command information identifying the type of I/O operation, a buffer handle identifying the registered virtual memory region, virtual memory address information identifying the locations of data buffers in the registered virtual memory region to be used for the I/O operation, an extent handle identifying the registered extent, and disk address information identifying an area within the registered extent to or from which data is to be written or read. The user posts this descriptor to the virtual interface by placed it on the associated queue.
    Type: Grant
    Filed: February 25, 2002
    Date of Patent: June 15, 2004
    Assignee: Network Appliance, Inc.
    Inventors: Alan B. Langerman, David A. Ford
  • Protected control of devices by user applications in multiprogramming environments
    Publication number: 20020083224
    Abstract: A user program directly accesses a storage device for I/O operations, bypassing the operating system. The user registers a virtual memory region and an “extent”, or region, of the storage device with a host bus adapter. A virtual interface is created between the user and the storage device including a queue for transmitting commands from the user to the storage device. To perform I/O, the user creates a descriptor including command information identifying the type of I/O operation, a buffer handle identifying the registered virtual memory region, virtual memory address information identifying the locations of data buffers in the registered virtual memory region to be used for the I/O operation, an extent handle identifying the registered extent, and disk address information identifying an area within the registered extent to or from which data is to be written or read. The user posts this descriptor to the virtual interface by placed it on the associated queue.
    Type: Application
    Filed: February 25, 2002
    Publication date: June 27, 2002
    Applicant: Network Appliances, Inc. a Delaware Corporation
    Inventors: Alan B. Langerman, David A. Ford
  • Protected control of devices by user applications in multiprogramming environments
    Patent number: 6360282
    Abstract: A user program directly accesses a storage device for I/O operations, bypassing the operating system. The user registers a virtual memory region and an “extent”, or region, of the storage device with a host bus adapter. A virtual interface is created between the user and the storage device including a queue for transmitting commands from the user to the storage device. To perform I/O, the user creates a descriptor including command information identifying the type of I/O operation, a buffer handle identifying the registered virtual memory region, virtual memory address information identifying the locations of data buffers in the registered virtual memory region to be used for the I/O operation, an extent handle identifying the registered extent, and disk address information identifying an area within the registered extent to or from which data is to be written or read. The user posts this descriptor to the virtual interface by placed it on the associated queue.
    Type: Grant
    Filed: March 24, 1999
    Date of Patent: March 19, 2002
    Assignee: Network Appliance, Inc.
    Inventors: Alan B. Langerman, David A. Ford