Processing user space operations directly between an application instance and an I/O adapter

• US 7,657,662 B2
• Filed: 08/31/2005
• Issued: 02/02/2010
• Est. Priority Date: 08/31/2005
• Status: Expired due to Fees

• Current Assignee: International Business Machines Corporation
• Original Assignee: International Business Machines Corporation
• Inventors: Recio, Renato J., Vega, Madeline, Boyd, William Todd, Mena, Agustin III, Hufferd, John Lewis
• Primary Examiner(s): Tsai; Henry W. H.
• Assistant Examiner(s): Wong; Titus
• Application Number:
  US11/216,712
• Publication Number:
  US 20070078892A1
• Time in Patent Office: 1,616 Days
• Field of Search: 710/62, 711/147
• US Class Current: 710/5
• CPC Class Codes: G06F 21/78 to assure secure storage of data address-based protection against unauthorised use of memory G06F12/14; record carriers for use with machines and with at least a part designed to carry digital markings G06K19/00
• CPC Class Codes: G06F 21/85 interconnection devices, e.g. bus-connected or in-line devices

Abstract

A mechanism is provided that enables user space middleware or applications to pass file name based storage requests directly to a physical I/O Adapter without run-time involvement from the local Operating System (OS). A mechanism is provided for using a file protection table (FPT) data structure, which may include a file name protection table (FNPT) and file extension protection table (FEPT), to control user space and out of user space Input/Output (I/O) operations. In addition, a mechanism is provided for managing the FPT based on user space operations to create, query, modify and delete entries in the FPT.

Claims

1. A method, in a data processing system, comprising:

receiving a user space operation from a user management interface;

determining if the user space operation is a resource management operation or a processing queue operation;

performing at least one resource management operation to manage a resource allocation for a resource in a file protection table data structure having a file name protection table, a file extension protection table, and a storage block address table, if the user space operation is the resource management operation, wherein the storage block address table identifies portions of a storage device which is to be allocated to a set of files for which the resource allocation is requested, wherein the file extension protection table comprises a set of pointers to one or more entries in the storage block address table and a set of file extension keys, and wherein the file name protection table comprises a set of pointers to one or more segments of the file extension protection table and a set of file name keys, wherein performing the at least one resource management operation further comprises;

determining if the user space operation is a resource modify operation;

responsive to the user space operation being the resource modify operation, modifying at least one attribute associated with a resource allocation in a file protection table entry, wherein modifying the at least one attribute associated with the resource allocation in the file protection table entry comprises modifying an attribute in a storage block address table entry;

initiating a timer if there is an I/O transaction active on the file protection table entry;

determining if a quiescent point at which there are no I/O transactions active on the file protection table entry being modified is reached before the timer times out; and

modifying the file protection table entry only if the quiescent point is reached before the timer times out; and

performing at least one processing queue operation, directly with an input/output (I/O) adapter without intervention by a system image, to manage a processing queue, if the user space operation is the processing queue operation, wherein performing the at least one processing queue operation comprises;

retrieving a completion queue entry from a completion queue in an I/O adapter for a completed out of user space input/output operation.

2. The method of claim 1, wherein performing the at least one resource management operation further comprises:

determining if the user space operation is a resource query operation and responsive to the user space operation being the resource query operation;

identifying a file name protection table entry corresponding to the resource;

identifying a file extension protection table entry corresponding to the file name protection table entry;

retrieving attribute information of the resource from the file extension protection table entry, wherein retrieving the attribute information for the resource allocation comprises;

querying the file extension protection table entry using a memory management interface of the I/O adapter; and

returning the retrieved attribute information of the resource to the user management interface.

3. The method of claim 1, wherein performing the at least one resource management operation further comprises:

determining if the user space operation is a resource create operation and responsive to the user space operation being the resource create operation;

creating the resource allocation in a file protection table entry of the file protection table data structure; and

returning results of the creation of the resource allocation to the user management interface.

4. The method of claim 3, wherein creating the resource allocation in the file protection table entry comprises:

identifying a file name protection table entry corresponding to the resource;

identifying a file extension protection table entry corresponding to the file name protection table entry;

identifying a segment of the storage block address table corresponding to the file extension protection table entry;

adding at least one entry to the segment of the storage block address table; and

updating the file extension protection table to reference the added at least one entry in the segment of the storage block address table.

5. The method of claim 3, wherein performing the at least one resource management operation comprises:

determining if the I/O adapter has available resources for allocating based on the user space operation, wherein the resources are allocated by creating the resource allocation only if the I/O adapter has available resources to be allocated.

6. The method of claim 3, wherein creating the resource allocation in the file protection table entry of the file protection table data structure comprises:

creating at least one entry in the storage block address table identifying at least one portion of the storage device which is to be allocated to a file for which the resource allocation is requested;

creating an entry in the file extension protection table for the at least one entry in the storage block address table, wherein the entry in the file extension protection table has a pointer to the at least one entry in the storage block address table and has an associated file extension key;

creating an entry in the file name protection table corresponding to a file for which the resources are to be allocated, wherein the file name protection table entry has a pointer to a segment of the file extension protection table and has an associated file name key; and

returning the file extension key and file name key to the application instance for use in submitting I/O requests.

7. The method of claim 3, wherein creating the resource allocation in the file protection table entry comprises:

using a memory management interface of the I/O adapter to create the file protection table entry.

8. The method of claim 1, wherein performing the at least one processing queue operation comprises;

building and adding at least one work queue entry to a work queue associated with an application instance running on the data processing system; and

informing the I/O adapter that the at least one work queue entry has been added to the work queue.

9. The method of claim 8, further comprising:

performing, in the I/O adapter, at least one validation check to ensure that the application instance may access portions of a storage device associated with a file referenced in the at least one work queue entry; and

performing, in the I/O adapter, at least one containment check to ensure that the portions of the storage device associated with a file referenced by the at least one work queue entry are within the portions of the storage device that have been allocated to the application instance.

10. A computer program product comprising a computer readable medium having a computer readable program stored therein, wherein the computer readable program, when executed on a computing device, causes the computing device to:

receive a user space operation from a user management interface;

determine if the user space operation is a resource management operation or a processing queue operation;

perform at least one resource management operation to manage a resource allocation for a resource in a file protection table data structure having a file name protection table, a file extension protection table and a storage block address table, if the user space operation is a resource management operation, wherein the storage block address table identifies portions of a storage device which is to be allocated to a set of files for which the resource allocation is requested, wherein the file extension protection table comprises a set of pointers to one or more entries in the storage block address table and a set of file extension keys, and wherein the file name protection table comprises a set of pointers to one or more segments of the file extension protection table and a set of file name keys wherein performing the at least one resource management operation further comprises;

determining if the user space operation is a resource modify operation;

responsive to the user space operation being the resource modify operation, modifying at least one attribute associated with a resource allocation in a file protection table entry, wherein modifying the at least one attribute associated with the resource allocation in the file protection table entry comprises modifying an attribute in a storage block address table entry;

initiating a timer if there is an I/O transaction active on the file protection table entry;

determining if a quiescent point at which there are no I/O transactions active on the file protection table entry being modified is reached before the timer times out; and

modifying the file protection table entry only if the quiescent point is reached before the timer times out; and

perform at least one processing queue operation, directly with an input/output (I/O) adapter without intervention by a system image, to manage a processing queue, if the user space operation is a processing queue operation, wherein the computer readable program causes the computing device to perform at least one processing queue operation by retrieving a completion queue entry from a completion queue in an I/O adapter for a completed out of user space input/output operation.

11. The computer program product of claim 10, wherein the computer readable program causes the computing device to perform at least one resource management operation by determining if the user space operation is a resource query operation, and if the user space operation is a resource query operation:

identifying a file name protection table entry corresponding to the resource;

identifying a file extension protection table entry corresponding to the file name protection table entry;

retrieving attribute information of a resource from the file extension protection table entry, wherein the computer readable program causes the computing device to retrieve attribute information for the resource allocation by using a memory management interface of the I/O adapter to query the file extension protection table entry; and

returning the retrieved attribute information of the resource to the user management interface.

12. The computer program product of claim 10, wherein the computer readable program causes the computing device to perform at least one resource management operation by determining if the user space operation is a resource create operation, and if the user space operation is a resource create operation:

creating the resource allocation in a file protection table entry of the file protection table data structure, wherein the computer readable program causes the computing device to create the resource allocation in the file protection table entry by;

identifying a file name protection table entry corresponding to the resource;

identifying a file extension protection table entry corresponding to the file name protection table entry;

identifying a segment of the storage block address table corresponding to the file extension protection table entry;

adding at least one entry to the segment of the storage block address table; and

updating the file extension protection table to reference the added at least one entry in the segment of the storage block address table; and

, wherein the computer readable program causes the computing device to create the resource allocation in the file protection table entry of the file protection table data structure by;

creating at least one entry in the storage block address table identifying at least one portion of the storage device which is to be allocated to a file for which the resource allocation is requested;

creating an entry in the file extension protection table for the at least one entry in the storage block address table, wherein the entry in the file extension protection table has a pointer to the at least one entry in the storage block address table and has an associated file extension key;

creating an entry in the file name protection table corresponding to a file for which the resources are to be allocated, wherein the file name protection table entry has a pointer to a segment of the file extension protection table and has an associated file name key; and

returning the file extension key and file name key to the application instance for use in submitting I/O requests; and

returning results of the creation of the resource allocation to the user management interface, wherein the computer readable program causes the computing device to perform at least one resource management operation by determining if the I/O adapter has available resources for allocating based on the user space operation, wherein the resources are allocated by creating the resource allocation only if the I/O adapter has available resources to be allocated and wherein the computer readable program causes the computing device to create the resource allocation in the file protection table entry by using a memory management interface of the I/O adapter to create the file protection table entry.

13. The computer program product of claim 10, wherein the computer readable program causes the computing device to perform at least one processing queue operation by:

building and adding at least one work queue entry to a work queue associated with an application instance running on the data processing system;

informing the I/O adapter that the at least one work queue entry has been added to the work queue;

performing, in the I/O adapter, at least one validation check to ensure that the application instance may access portions of a storage device associated with a file referenced in the at least one work queue entry; and

performing, in the I/O adapter, at least one containment check to ensure that the portions of the storage device associated with a file referenced by the at least one work queue entry are within the portions of the storage device that have been allocated to the application instance.

14. An apparatus, comprising:

a processor; and

a storage device coupled to the processor, wherein the processor;

receives a user space operation from a user management interface;

determines if the user space operation is a resource management operation or a processing queue operation;

performs at least one resource management operation to manage a resource allocation for a resource in a file protection table data structure, stored in the storage device, having a file name protection table, a file extension protection table and a storage block address table, if the user space operation is a resource management operation, wherein the storage block address table identifies portions of a storage device which is to be allocated to a set of files for which the resource allocation is requested, wherein the file extension protection table comprises a set of pointers to one or more entries in the storage block address table and a set of file extension keys, and wherein the file name protection table comprises a set of pointers to one or more segments of the file extension protection table and a set of file name keys, wherein performing the at least one resource management operation further comprises;

determining if the user space operation is a resource modify operation;

responsive to the user space operation being the resource modify operation, modifying at least one attribute associated with a resource allocation in a file protection table entry, wherein modifying the at least one attribute associated with the resource allocation in the file protection table entry comprises modifying an attribute in a storage block address table entry;

initiating a timer if there is an I/O transaction active on the file protection table entry;

determining if a quiescent point at which there are no I/O transactions active on the file protection table entry being modified is reached before the timer times out; and

modifying the file protection table entry only if the quiescent point is reached before the timer times out; and

performs at least one processing queue operation, directly with an input/output (I/O) adapter without intervention by a system image, to manage a processing queue, if the user space operation is a processing queue operation, wherein the processor performs at least one processing queue operation by retrieving a completion queue entry from a completion queue in an I/O adapter for a completed out of user space input/output operation.

15. The apparatus of claim 14, wherein the processor performs at least one resource management operation by determining if the user space operation is a resource query operation, and if the user space operation is a resource query operation:

identifying a file name protection table entry corresponding to the resource;

identifying a file extension protection table entry corresponding to the file name protection table entry;

retrieving attribute information of a resource from the file extension protection table entry, wherein the computer readable program causes the computing device to retrieve attribute information for the resource allocation by using a memory management interface of the I/O adapter to query the file extension protection table entry; and

returning the retrieved attribute information of the resource to the user management interface.

16. The apparatus of claim 14, wherein the processor performs at least one resource management operation by determining if the user space operation is a resource create operation, and if the user space operation is a resource create operation:

creating the resource allocation in a file protection table entry of the file protection table data structure, wherein the computer readable program causes the computing device to create the resource allocation in the file protection table entry by;

identifying a file name protection table entry corresponding to the resource;

identifying a file extension protection table entry corresponding to the file name protection table entry;

identifying a segment of the storage block address table corresponding to the file extension protection table entry;

adding at least one entry to the segment of the storage block address table; and

updating the file extension protection table to reference the added at least one entry in the segment of the storage block address table; and

, wherein the computer readable program causes the computing device to create the resource allocation in the file protection table entry of the file protection table data structure by;

creating at least one entry in the storage block address table identifying at least one portion of the storage device which is to be allocated to a file for which the resource allocation is requested;

creating an entry in the file extension protection table for the at least one entry in the storage block address table, wherein the entry in the file extension protection table has a pointer to the at least one entry in the storage block address table and has an associated file extension key;

creating an entry in the file name protection table corresponding to a file for which the resources are to be allocated, wherein the file name protection table entry has a pointer to a segment of the file extension protection table and has an associated file name key; and

returning the file extension key and file name key to the application instance for use in submitting I/o requests; and

returning results of the creation of the resource allocation to the user management interface, wherein the computer readable program causes the computing device to perform at least one resource management operation by determining if the I/O adapter has available resources for allocating based on the user space operation, wherein the resources are allocated by creating the resource allocation only if the I/O adapter has available resources to be allocated and wherein the computer readable program causes the computing device to create the resource allocation in the file protection table entry by using a memory management interface of the I/O adapter to create the file protection table entry.

17. The apparatus of claim 14, wherein the processor performs at least one processing queue operation by:

building and adding at least one work queue entry to a work queue associated with an application instance running on the data processing system;

informing the I/O adapter that the at least one work queue entry has been added to the work queue;

performing, in the I/O adapter, at least one validation check to ensure that the application instance may access portions of a storage device associated with a file referenced in the at least one work queue entry; and

performing, in the I/O adapter, at least one containment check to ensure that the portions of the storage device associated with a file referenced by the at least one work queue entry are within the portions of the storage device that have been allocated to the application instance.