Method and apparatus for virtualizing file system placeholders at a computer

• US 9,239,762 B1
• Filed: 08/11/2009
• Issued: 01/19/2016
• Est. Priority Date: 08/11/2009
• Status: Active Grant

• Current Assignee: Veritas Technologies, LLC (Whitehouse Group Ltd.)
• Original Assignee: Symantec Corporation (NortonLifeLock Inc.)
• Inventors: Gunda, Laxmikant Vithal, Shanmugham, Pillai Biju
• Primary Examiner(s): OBISESAN, AUGUSTINE KUNLE
• Application Number:
  US12/539,571
• Time in Patent Office: 2,352 Days
• Field of Search: None
• US Class Current: 1/1
• CPC Class Codes: G06F 11/1448 Management of the data involved in backup or backup restore
• CPC Class Codes: G06F 16/188 Virtual file systems

Abstract

The virtualization of file system placeholders is described. In one embodiment, a method for virtualizing placeholders includes monitoring placeholder creation initiated by at least one archival operation, generating placeholder data in a separate data store from a file system, wherein the placeholder data comprises a plurality of placeholders that correspond with a plurality of archived files, and servicing access requests for at least one archived file of the plurality of archived files using the placeholder data.

Claims

1. A method comprising:

performing an archive operation, wherein

the archive operation archives a file stored in a first computer system,

the archive operation comprises copying the file from the first computer system to a second computer system, and

the first computer system comprises a file system;

creating a placeholder in a separate data store, in response to the performing the archive operation, wherein

the placeholder corresponds to the file,

the creation of the placeholder in the separate data store is initiated by the performing of the archive operation,

the placeholder is not stored in the first computer system or the second computer system,

the separate data store is other than the first computer system and the second computer system,

the placeholder is unviewable by the file system, and

the placeholder is unviewable and inaccessible by a plurality of unregistered applications;

selectively registering an application of the plurality of applications, wherein

the file is mapped to the application, and

the selectively registering the application grants the application access rights to the placeholder in the separate data store;

maintaining information associated with the application, wherein

the information indicates that the application has permission to access the placeholder in the separate data store; and

servicing an access request, in response to determining that the access request was received from the application and that the application is registered to access the placeholder, wherein

the access request is redirected to the separate data store,

the access request is a request to access at least one archived file of a plurality of archived files or the placeholder,

the servicing comprises granting access to the at least one archived file, and

accessing the at least one archived file utilizes the placeholder in the separate data store.

2. The method of claim 1, further comprising:

redirecting the access request from the application to the separate data store.

3. The method of claim 1, further comprising:

recalling file data for the at least one archived file from a repository.

4. The method of claim 1, further comprising:

transforming the plurality of archived files into a plurality of placeholders.

5. The method of claim 1, wherein the generating the placeholder further comprises:

configuring the placeholder to be unviewable to an operating system.

6. The method of claim 1, further comprising:

downloading the at least one archived file to a volume that is organized in accordance with the file system.

7. The method of claim 1, wherein accessing the separate data store further comprises:

permitting the application to access the separate data store to examine the placeholder.

8. The method of claim 1, wherein

the separate data store is located on a third computer system, and

the storing the place holder in the separate data store comprises accessing a placeholder database on the third computer system.

9. The method of claim 1, wherein

the archive operation is performed by archive software,

an agent creates the placeholder concurrently with the performing the archive operation, and

the selectively registering the application is performed by a monitor module.

10. A system comprising:

one or more processors;

memory coupled to the one or more processors, wherein the memory stores program instructions executable by the one or more processors to;

perform an archive operation, wherein

the archive operation archives a file stored in a first computer system,

the archive operation comprises copying the file from the first computer system to a second computer system, and

the first computer system comprises a file system;

create a placeholder in a separate data store, in response to the detecting the archive operation, wherein

the placeholder corresponds to the file,

the creation of the placeholder in the separate data store is initiated by the performing of the archive operation,

the placeholder is not stored in the first computer system or the second computer system,

the separate data store is other than the first computer system and the second computer system,

the placeholder is unviewable by the file system, and

the placeholder is unviewable and inaccessible by a plurality of unregistered applications;

selectively register an application of the plurality of applications, wherein

the file is mapped to the application, and

selectively registering the application grants the application access rights to the placeholder in the separate data store;

maintain information associated with the application, wherein

the information indicates that the application has permission to access the placeholder in the separate data store; and

access the data store to process an access request, in response to determining that the access request was received from the application and that the application is registered to access the placeholder, wherein

the access request is redirected to the separate data store,

the access request is a request to access at least one archived file of a plurality of archived files or the placeholder, and

accessing the separate data store comprises granting access to the at least one archived file using the placeholder in the separate data store.

11. The system of claim 10, wherein the program instructions are further executable to:

redirect the access request from the application to the separate data store.

12. The system of claim 10, wherein the program instructions are further executable to:

recall file data for the at least one archived file from a repository.

13. The system of claim 10, wherein the program instructions are further executable to:

transform the plurality of archived files into a plurality of placeholders.

14. The system of claim 10, wherein the program instructions are further executable to:

communicate the at least one archived file to a volume that is organized in accordance with the file system.

15. The system of claim 10, wherein the program instructions are further executable to:

permit the application to access the separate data store to examine the placeholder.

16. The system of claim 10, wherein the program instructions are further executable to:

configure the plurality of placeholders to be unviewable to an operating system.

17. A non-transitory computer-readable-storage medium comprising one or more processor-executable instructions that, when executed by at least one processor, causes the at least one processor to:

perform an archive operation, wherein

the archive operation archives a file stored in a first computer system,

the archive operation comprises copying the file from the first computer system to a second computer system, and

the first computer system comprises a file system;

create a placeholder in a separate data store in response to the detecting the archive operation, wherein

the placeholder corresponds to the file,

the creation of the placeholder in the separate data store is initiated by the performing of the archive operation,

the placeholder is not stored in the first computer system or the second computer system,

the separate data store is other than the first computer system and the second computer system,

the placeholder is unviewable by the file system, and

the placeholder is unviewable and inaccessible by a plurality of unregistered applications;

selectively register an application of the plurality of applications, wherein

the file is mapped to the application, and

the selectively registering the application grants the application access rights to the placeholder in the separate data store;

maintain information associated with the application, wherein

the information indicates that the application has permission to access the placeholder in the separate data store; and

service an access request, in response to determining that the access request was received from the application and that the application is registered to access the placeholder, wherein

the access request is redirected to the separate data store,

the access request is a request to access at least one archived file of a plurality of archived files or the placeholder, and

accessing the separate data store comprises granting access to the at least one archived file using the placeholder in the separate data store.

18. The non-transitory computer-readable-storage medium of claim 17, wherein the one or more processor-executable instructions, when executed by the at least one processor, further cause the at least one processor to:

redirect the access request from the application to the separate data store.

19. The non-transitory computer-readable-storage medium of claim 17, wherein the one or more processor-executable instructions, when executed by the at least one processor, further cause the at least one processor to:

recall file data for the at least one archived file from a repository.

20. The non-transitory computer-readable-storage medium of claim 17, wherein the one or more processor-executable instructions, when executed by the at least one processor, further cause the at least one processor to:

transform the plurality of archived files into a plurality of placeholders.