System and method for providing access to computer files across computer operating systems

• US 7,493,314 B2
• Filed: 01/10/2005
• Issued: 02/17/2009
• Est. Priority Date: 01/10/2005
• Status: Active Grant

• Current Assignee: Cyberlink Corporation
• Original Assignee: Cyberlink Corporation
• Inventors: Huang, Jau-Hsiung, Tseng, Wei-Hsin, Chou, Hung-Te, Weng, Yung-Chiuan
• Primary Examiner(s): Vital; Pierre M
• Assistant Examiner(s): EHICHIOYA, IRETE FRED
• Application Number:
  US11/032,440
• Publication Number:
  US 20060155669A1
• Time in Patent Office: 1,499 Days
• Field of Search: 707/3, 707/10, 707/100, 707/200, 713/2, 714/36, 714/42, 718/100
• US Class Current: 1/1
• CPC Class Codes: G06F 16/10 File systems; File servers
• CPC Class Codes: Y10S 707/99933 Query processing, i.e. searching

Abstract

An across-file-system file access system and method for accessing files across different computer operating systems and file systems is disclosed. The across-file-system file access system includes a file resource table generator and a file resource table reader. The file resource table generator creates and up-dates a file resource table, which associates file markers for files stored in a given partition with the physical addresses of the files within the given partition. The file resource table generator is run on top of a first operating system, and the given partition is managed by a file system that uses a file system table. The file resource table reader run on top of a second computer operating system, which cannot access the file system table of the file system. The file resource table reader reads the file resource table to provide access to the files listed in the file resource table.

Claims

1. In a first computer system, a method of providing access to a file stored in a partition of a mass storage device of the first computer system, the method comprising the steps of:

running a first computer operating system on the first computer system;

employing a first file system having a file system table to manage the partition, wherein a second computer operating system cannot read the file system table of the first file system;

receiving file system information for the file, wherein the file system information for the file comprises a physical address associated with a block;

determining from the file system information whether to include at least a portion of the file system information in a file resource table, the file resource table associating a file marker for the file with a physical address of the file within the partition, and the file resource table is employed by a file system other than the first file system; and

making the file resource table accessible to the second computer system running a second computer operating system, wherein the step of making the file resource table accessible comprises providing a pointer to the file resource table, and the file resource table is configured to be read by a file resource table reader being run on top of the second computer operating system.

2. The method of claim 1, further including the step of:

running a file resource table generator on top of the first computer operating system, wherein the file resource table generator receives the file system information and generates the file resource table.

3. The method of claim 2, wherein the file resource table generator is run on top of the first computer operating system in the back ground.

4. The method of claim 2, further including the step of:

providing the file resource table generator with criteria for determining whether to include the file in the file resource table.

5. The method of claim 2, wherein the file resource table generator uses application program interface modules to receive file system information.

6. The method of claim 1, wherein the determination on whether to include the file in the file resource table is based at least in part upon the file-type of the file.

7. The method of claim 1, wherein the step storing the file resource table in a second partition that is managed by a second file system, wherein the second partition is readable by the second computer operating system, and the second file system is different from the first file system.

8. The method of claim 7, wherein the first computer system and the second computer system are different computer systems, and the first computer operating system is different from the second computer operating system.

9. The method of claim 1, wherein the pointer is accessible to the second computer operating system.

10. The method of claim 9, wherein the first computer system and the second computer system are the same computer systems.

11. The method of claim 1, wherein the first computer system is configured as a dual boot computer system adapted to boot either the first computer operating system or a second computer operating system.

12. In a first computer system having a first partition that employs a first file system using a first file system table, a method of accessing a file stored in a second partition of a mass storage device of a second computer system, wherein the second partition of the mass storage device is managed by a second file system having a second file system table, the method comprising the steps of:

running a first computer operating system on the first computer system, wherein the first computer system is configured as a dual boot computer system adapted to boot either the first computer operating system or a second computer operating system, wherein the first computer operating system cannot read the second file system table of the second file system of the second computer system;

reading a file resource table, the file resource table associating a file marker for the file with an address, the address being the physical address of the file within the second partition of the second computer system, the file marker denoting a path in the second file system to the file stored in the second partition of the second computer system and wherein the file resource table is employed by a file system other than the first file system;

using the file resource table to access the file stored in the second partition of the second computer system; and

running a file resource table reader on top of the first computer operating system in the background, wherein the file resource table reader reads the file resource table.

13. The method of claim 12, further including the step of:

finding a pointer to the file resource table, wherein the file resource table is stored within the second file system, and the pointer is stored in a location that is outside of the second file system.

14. The method of claim 12, further including the step of:

determining a location of the file resource table.

15. The method of claim 14, wherein the step of determining the location of the file resource table further includes the steps of:

accessing a third partition, the third partition being managed by a third file system having a third file system table, wherein the third partition is accessible to both the first computer system and the second computer system; and

reading the third file system table, wherein the third file system table associates the physical address of the file resource table with the file resource table.

16. The method of claim 15, wherein the first and second computer systems are the same computer system.

17. A program embodied in a computer readable storage medium, the program comprising:

logic configured to receive file system information for a file stored in a partition managed by a first file system having first file system table, wherein the first file system is compatible with a first computer operating system;

logic configured to determine from the file system information whether to include at least a portion of the file system information in a file resource table;

wherein the file resource table associating a file marker for the file with a physical address of the file within the partition, and the file resource table is employed by a file system other than the first file system

logic configured to make the file resource table accessible to a second computer system running a second computer operating system including logic configured to provide a pointer to the file resource table;

logic configured to run a file resource table generator on top of the first computer operating system, wherein the file resource table generator receives the file system information and generates the file resource table, and

logic configured to run a file resource table reader on top of the second computer operating system, wherein the file resource table reader is configured to read the file resource table.

18. The program of claim 17, wherein the file resource table generator is run on top of the first computer operating system in the back ground.

19. The program of claim 17, further including:

logic configured to provide the file resource table generator with criteria for determining whether to include the file in the file resource table.

20. The program of claim 17, wherein the file resource table generator uses application program interface modules to receive file system information.

21. The program of claim 17, wherein the determination on whether to include the file in the file resource table is based at least in part upon the file-type of the file.

22. The program of claim 17, wherein the file resource table is employed by a file system other than the first file system.

23. The program of claim 17, wherein logic configured to make the file resource table accessible includes logic configured to store the file resource table in a second partition that is managed by a second file system, wherein the second partition is readable by the second computer operating system, and the second file system is different from the first file system.

24. The program of claim 23, wherein the first computer system and the second computer system are different computer systems, and the first computer operating system is different from the second computer operating system.

25. The program of claim 17, wherein the pointer is accessible to the second computer operating system.

26. The program of claim 25, wherein the first computer system and the second computer system are the same computer systems.

27. The program of claim 17, wherein the file system information for the file comprises a physical address associated with a block.

28. A program embodied in a computer readable medium, the program comprising:

logic configured to read a file resource table, wherein the file resource table is employed by a file system other than the first file system, the file resource table associating a file marker for a file with an address, the address being the physical address of the file within a partition managed by a file system having a file system table, the file marker denoting a path in the second file system to the file;

logic configured to use the file resource table to access the file;

logic configured to determine a location of the file resource table including logic configured to access a second partition, the second partition being managed by a third file system having a second file system table, wherein the second partition is accessible to both the first computer and the second computer;

logic configured to read the second file system table, wherein the second file system table associates the physical address of the file resource table with the file resource table;

logic configured to find a pointer to the file resource table, wherein the file resource table is stored within the partition, and the pointer is stored in a location that is outside of the partition; and

logic configured to run a file resource table reader on top of a first computer operating system in the background, wherein the file resource table reader reads the file resource table.

29. The program of claim 28, wherein the first and second computer systems are the same computer system.