System and method for intercepting file system writes

• US 6,606,685 B2
• Filed: 11/15/2001
• Issued: 08/12/2003
• Est. Priority Date: 11/15/2001
• Status: Expired due to Term

• Current Assignee: BMC Software Incorporated (KKR & Co., Inc.)
• Original Assignee: BMC Software Incorporated (KKR & Co., Inc.)
• Inventors: Huxoll, Vernon F.
• Primary Examiner(s): Nguyen, Hiep T.
• Application Number:
  US10/002,273
• Publication Number:
  US 20030093620A1
• Time in Patent Office: 635 Days
• Field of Search: 711/113, 711/118, 707/204
• US Class Current: 711/118
• CPC Class Codes: G06F 16/10 File systems; File servers
• CPC Class Codes: Y10S 707/99953 Recoverability
• CPC Class Codes: Y10S 707/99955 Archiving or backup

Abstract

A method and system for intercepting file system writes. When intercept processing is enabled, a file write request may be passed to intercept write processing, prior to normal write processing. Intercept write processing may include: identifying the file, copying original file information, modifying the write pointer within the original file information, storing the intercepted write in a cache using the modified write pointer. The intercepted write may be allowed to complete normal processing after the intercepted writes are stored in the cache. The intercepted writes may then be retrieved from the cache (e.g., in first-in-first-out (FIFO) order, or in some other user-specified order).

Claims

1. A method of data storage and retrieval in a computer system, the method comprising:

registering one or more files with an intercept software component technology, wherein said registering is performed using a first software utility;

the intercept software component technology intercepting writes to the one or more registered files;

storing the intercepted writes to the one or more registered files in a cache;

the first software utility retrieving the intercepted writes to the one or more registered files from the cache in a particular order.

2. The method of claim 1, further comprising:

the intercepted writes to the one or more registered files completing normal processing, after the intercepted writes are stored in the cache.

3. The method of claim 1, wherein the particular order is first in first out.

4. The method of claim 1, further comprising:

performing initialization processing prior to registering one or more files with the intercept software component technology, wherein the initialization processing operates to prepare the one or more files for interception;

stopping the intercept software component technology, after retrieving the intercepted writes;

performing termination processing, after stopping the intercept software component technology.

5. The method of claim 1, wherein the cache is a memory cache or a disk cache.

6. The method of claim 1, further comprising:

signaling the intercept software component technology to start intercept processing after one or more files are registered with the intercept software component technology, wherein said signaling is performed using the first software utility.

7. A method of data storage in a first computer system, the method comprising:

registering one or more files with an intercept software component technology, wherein said registering is performed using a first software utility;

the intercept software component technology intercepting writes to the one or more registered files;

storing data from the intercepted writes to the one or more registered files in a cache;

the intercepted writes to the one or more registered files completing normal processing, after the intercepted writes are stored in the cache;

the first software utility requesting data from one or more of the intercepted writes to the one or more registered files from the cache.

8. The method of claim 7, wherein the cache is a memory cache or a disk cache.

9. The method of claim 7, further comprising:

a second computer system;

the intercept software component technology executing on the first computer system;

the first software utility executing on the second computer system; and

wherein the first computer system and the second computer system communicate over a network.

10. The method of claim 9, wherein the network is the Internet.

11. The method of claim 7, wherein the first software utility requesting data from one or more of the intercepted writes to the one or more registered files from the cache comprises:

retrieving the requested data from the cache.

12. A method of intercepting writes to one or more files in a computer system, the method comprising:

finding one or more file identifiers associated with the one or more files;

storing a copy of original information related to each file identifier wherein the copy of the original information related to each file identifier comprises a write pointer;

modifying the write pointer within the original information related to each file identifier;

storing the intercepted write to the one or more files in a cache using the modified write pointer;

allowing the intercepted write to the one or more files to complete normal processing after the intercepted writes are stored in the cache.

13. The method of claim 12, further comprising:

retrieving the intercepted writes to the one or more files from the cache.

14. The method of claim 12, wherein the one or more file identifiers comprise vnodes.

15. The method of claim 14, wherein the original information related to each file identifier comprises vnode operation pointers.