Janet E Adkins

US Patent:

7440966, Oct 21, 2008

Filed:

Feb 12, 2004

Appl. No.:

10/777719

Inventors:

Janet Elizabeth Adkins - Austin TX, US
Joon Chang - Austin TX, US

Assignee:

International Business Machines Corporation - Armonk NY

International Classification:

G06F 7/00

US Classification:

707102, 707100, 7071041

Abstract:

A method, apparatus, and computer instructions for managing data in a file system in a data processing system. A request to modify a data block in the file system is detected during file system recovery time. In response to detecting the request, metadata is written to describe the data block into a snapshot image. The data is copied for the data block in the file system to the snapshot image. The data block is modified in the file system after the data is copied into the snapshot image. The snapshot image may be used to return the file system to a state prior to modifying the data block in the file system.

US Patent:

7464114, Dec 9, 2008

Filed:

Sep 27, 2005

Appl. No.:

11/236450

Inventors:

Janet Elizabeth Adkins - Austin TX, US
Mark Allen Grubbs - Round Rock TX, US

Assignee:

International Business Machines Corporation - Armonk NY

International Classification:

G06F 17/30
G06F 12/00

US Classification:

707200, 707202, 707204

Abstract:

A processor selects file system metadata. A processor identifies each unit of data in a file system. The processor determines if the unit of data contains file system metadata. The processor writes a unit of data of metadata to a diagnostic file system, provided it was determined that the unit of data contains file system metadata. The processor then determines if the unit of data contains user data. If the unit of data contains user data, the processor writes a sparse object to the diagnostic file.

US Patent:

7472138, Dec 30, 2008

Filed:

Dec 14, 2004

Appl. No.:

11/011242

Inventors:

Janet Elizabeth Adkins - Austin TX, US
Joon Chang - Austin TX, US
Ashley D. Lai - Austin TX, US

Assignee:

International Business Machines Corporation - Armonk NY

International Classification:

G06F 12/00

US Classification:

707202, 707200, 707204, 714 1, 714 15, 714 16, 714 19, 714 20

Abstract:

A system and method in a data processing system for recovering data in a file system. A request to modify a data block in the file system is detected. In response to detecting the request to modify the data block, metadata describing the data block in the file system is written in a log. In response to detecting an error during the writing of the metadata, an error counter is incremented. Finally, in response to a request to recover the data in the file system, the metadata is read only if the error counter is less than or equal to a predetermined value.

US Patent:

7567994, Jul 28, 2009

Filed:

Jan 18, 2006

Appl. No.:

11/334669

Inventors:

Janet Elizabeth Adkins - Austin TX, US
Mark Allen Grubbs - Round Rock TX, US

Assignee:

International Business Machines Corporation - Armonk NY

International Classification:

G06F 12/00
G06F 17/30

US Classification:

707204, 707200

Abstract:

An operating system creates a current sparse object in a diagnostic file system. Then the operating system processes a change to data contained in a block. The operating system determines if the change is to a metadata block. The operating system encodes the change in a journal log, in response to a determination that the change is to a metadata block. In addition, the operating system writes the block to the current sparse object, in response to a determination that the change is to a metadata block.

US Patent:

7702662, Apr 20, 2010

Filed:

May 16, 2007

Appl. No.:

11/749614

Inventors:

Janet Elizabeth Adkins - Austin TX, US
Joon Chang - Austin TX, US

Assignee:

International Business Machines Corporation - Armonk NY

International Classification:

G06F 12/00

US Classification:

707204, 707205, 711161, 711162, 711170

Abstract:

A system for managing a file system. In response to a user selecting an image of the file system to perform a rollback operation, each data block in the file system that is owned by the image is searched for. Then, it is determined whether a data block owned by the image is marked in a first map and a second map. In response to determining that the data block owned by the image is marked in the first map and the second map, the data block is marked in a third map. In response to determining that the data block owned by the image is marked in the third map, a new data block is allocated in the file system. Subsequently, data from the data block owned by the image is copied to the new data block in the file system prior to performing the rollback operation to avoid a collision that causes data corruption.

US Patent:

7921081, Apr 5, 2011

Filed:

May 30, 2007

Appl. No.:

11/755315

Inventors:

Janet E. Adkins - Austin TX, US
Joon Chang - Austin TX, US

Assignee:

International Business Machines Corporation - Armonk NY

International Classification:

G06F 7/00
G06F 17/00
G06F 12/00
G06F 13/00
G06F 15/16

US Classification:

707649, 707696, 707823, 711162

Abstract:

In one embodiment, at least one snapshot thread manages a point in time snapshot of a file system stored within the space allocated to the file system. The snapshot thread tracks, for at least one block of the plurality of blocks of the file system, a separate entry in a snapshot map specifying if each at least one block is newly allocated following the creation of the point in time snapshot and specifying an addressed location of a snapshot copy of the at least one block if copied. Separately, a file system handling thread tracks a mapping of an allocation state of each of said plurality of blocks of the file system. Responsive to detecting the file system triggered to write or delete a particular block from among the at least one block of the file system, the snapshot thread allows the file system to write to or delete the particular block without making a snapshot copy of the particular block if a particular entry for the particular block in the snapshot map specifies the particular block is newly allocated, wherein a block marked newly allocated was not in-use at the point in time of the file system snapshot.

US Patent:

7958325, Jun 7, 2011

Filed:

Sep 11, 2007

Appl. No.:

11/853442

Inventors:

Janet Elizabeth Adkins - Austin TX, US
Joon Chang - Austin TX, US

Assignee:

International Business Machines Corporation - Armonk NY

International Classification:

G06F 12/00
G06F 13/00
G06F 13/28

US Classification:

711162, 707639

Abstract:

A temporary file is identified. The temporary file includes a data block containing a first file image. A determination is made whether the temporary block has been included in a previous snapshot. Responsive to receiving a modification of the temporary block that has been included in the previous snapshot, a modified first image is created. The modified image is stored in the original file block, and the original image is copied to a newly allocated block. The original first block is updated to include a reference to the second block.

US Patent:

8019733, Sep 13, 2011

Filed:

May 22, 2008

Appl. No.:

12/125679

Inventors:

Janet Elizabeth Adkins - Austin TX, US
Mark Allen Grubbs - Round Rock TX, US

Assignee:

International Business Machines Corporation - Armonk NY

International Classification:

G06F 7/00

US Classification:

707687, 707690

Abstract:

A processor selects file system metadata. A processor identifies each unit of data in a file system. The processor determines if the unit of data contains file system metadata. The processor writes a unit of data of metadata to a diagnostic file system, provided it was determined that the unit of data contains file system metadata. The processor then determines if the unit of data contains user data. If the unit of data contains user data, the processor writes a sparse object to the diagnostic file.