FILE SYSTEM MANAGEMENT TECHNIQUES FOR COMPUTING ENVIRONMENTS AND SYSTEMS

• US 20110167049A1
• Filed: 01/05/2010
• Published: 07/07/2011
• Est. Priority Date: 01/05/2010
• Status: Abandoned Application

• Current Assignee: Apple Inc.
• Original Assignee: Apple Inc.
• Inventors: RON, Shachar
• Application Number:
  US12/652,617
• Publication Number:
  US 20110167049A1
• Time in Patent Office: Days
• US Class Current: 707/690
• CPC Class Codes: G06F 11/1435 using file system or storage system metadata
• CPC Class Codes: G06F 16/1847 specifically adapted to static storage, e.g. adapted to flash memory or SSD

Abstract

Disclosed file system management techniques can augment and/or enhance a file management system (e.g., a conventional file system) provided for organizing data stored in computer readable storage medium (e.g., a HDD). Data and metadata can be written to a file system space of a file system without using a file management system and without incorporating the data into the file system. However, the metadata can include information allowing the written data to be (later) incorporated into the file system and without having to use the file system, thereby allowing write performance to be enhanced. Generally, metadata can provide additional information including data (e.g., integrity data) that cannot be provided or efficiently provided by the file management system to augment a limited or reduced file system. Integrity data can be especially useful for error recovery (e.g., after a system failure).

Claims

1. In a computing system having at least a file system for storing data files, the file system managed by a first file management system, a method comprising:

using a second file management system different from the first file management system to write data and metadata to a file system space of the file system; and

using at least some of the metadata to incorporate the written data into the file system for management by the first file management system.

2. The method as recited in claim 1, further comprising:

reserving a portion of the file system space as a reserved file system space into which only the second file management system is permitted to write the data and the metadata, wherein the first file management system is permitted to write the data and metadata to an unreserved remaining portion of the file system space; and

writing at least some of the data and metadata to the reserved file system space by the second file management system.

3. The method as recited in claim 2, wherein the using at least some of the metadata to incorporate the written data into the file system for management by the first file management system comprises:

updating file system information by the second file management system, the updated file system information corresponding to the at least some data written by the second file management system to the reserved file system space; and

managing the data written to the file system space by the first file management system using the updated file system information.

4. The method as recited in claim 1, further comprising:

writing integrity data to the file system space, the integrity data associated with the data written to the file system space by the second file management system;

verifying the integrity of the data written to the file system space by the second file management system using the integrity data; and

when the verification is successful, incorporating the data written to the file system space by the second file management system into the file system for management by the first file management system.

5. The method as recited in claim 4, wherein the integrity data is used to verify the written data when one or more of the following occurs:

the computing system is booted up and a system failure or error occurs, the system failure or error including at least one of;

a system crash and an unexpected system shutdown.

6. The method as recited in claim 2, further comprising:

suspending or halting the first file management system; and

notifying the first file management system of the reserved file system space.

7. The method as recited in claim 1, wherein the metadata includes at least one of the following:

log data including information that allows incorporation of the written data to the file system,

log data including information that allows updating file system organization information pertaining to organization of files in the file system, and

integrity verification data including information that allows verification of integrity of the written data.

8. A computing system, comprising:

a data storage device arranged to store data files as a file system, the file system managed by a first file management system; and

a processor coupled to the data storage device, wherein the processor is configured to write data and metadata to a file system space of the file system using a second file management system different from the first file management system, wherein at least some of the metadata is used by the second file management system to incorporate the written data into the file system after which the written data is managed by the first file management system.

9. The computing system as recited in claim 8, wherein the processor is further configured to reserve a portion of the file system space as a reserved file system space into which only the second file management system is permitted to write the data and the meta data, wherein the first file management system is permitted to write the data and metadata to an unreserved remaining portion of the file system space.

10. The computing system as recited in claim 9, wherein the processor is further configured to use the second file management system to write the data and at least some of the metadata to the reserved file system space.

11. The computing system as recited in claim 10, wherein the processor is further configured to use the second file management system uses at least some of the metadata written to the reserved file system space to update file system information, the updated file system information is used by the first file management system to manage the written data.

12. The computing system as recited in claim 8, wherein the processor is further configured to:

write integrity data associated with the written data in the file system space;

use the integrity data to verify the integrity of the written data; and

incorporate the written data into the file system when the verification is successful.

13. The computing system as recited in claim 12, wherein the integrity data is used to verify the written data when one or more of the following occurs:

the computing system is booted up and a system failure or error occurs, the system failure or error including at least one of;

a system crash and an unexpected system shutdown.

14. The computing system as recited in claim 8, wherein the first file management system is or includes one or more of the following File Systems:

a FAT File System, an HFS File System, a Live File System, a Disk File System, a Flash File System, a data base File System, a transactional File System, a network File System, a shared File System, a File System where files are arranged dynamically, a File System where files are arranged dynamically by executable computer program code at runtime.

15. A computer readable storage medium storing at least executable computer code for managing a file system by a first file management system and a second file management system, wherein the first and second file management systems are different from each other, wherein the executable computer code includes:

executable computer code to write data and metadata to a file system space of the file system using the second file management system, wherein at least some of the metadata is used to incorporate the written data into the file system for management by the first file management system;

executable computer code for reserving a portion of the file system space as a reserved file system space into which only the second file management system is permitted to write the data and the meta data, wherein the first file management system is permitted to write the data and metadata to an unreserved remaining portion of the file system space; and

executable computer code for writing at least some of the data and metadata to the reserved file system space by the second file management system.

16. The computer readable storage medium of claim 15, wherein the computer readable storage medium further includes:

executable computer code for updating file system information of the file system to incorporate the written data into the file system, wherein the file system information is used by the first management system to manage the file system.

17. The computer readable storage medium of claim 15, wherein the computer readable storage medium further includes:

executable computer code to reserve a portion of the file system space as a reserved file system space into which only the second file management system is permitted to write the data; and

executable computer code to write the data and metadata to the reserved file system space by the second file management system.

18. The computer readable storage medium of claim 15, wherein the computer readable storage medium further includes:

executable computer code to write integrity data for the written data in the file system space;

executable computer code to use the integrity data to verify the integrity of the written data; and

executable computer code to incorporate the written data into the file system when the verification is successful.

19. The computer readable storage medium of claim 18, wherein the computer readable storage medium further includes:

executable computer code to use the integrity data to verify the written data when one or more of the following occurs;

the computing system is booted up, and a system failure or error occurs, including at least one of;

a system crash, and an unexpected system shutdown.

20. A consumer electronic product, comprising:

a data storage device having a file system arranged to store a plurality of data files, the data files being managed by a first file management system;

a processor coupled to the data storage device, the processor configured to execute instructions to perform at least the following operations;

use a second file management system different from the first file management system to write data and metadata to a file system space of the file system, and

use at least some of the metadata to incorporate the written data into the file system for management by the first file management system.

21. The consumer electronic product as recited in claim 20, further comprising:

a data port arranged to facilitate passing of data between the data storage device and an external data source.

22. The consumer electronic product as recited in claim 21, wherein the processor halts the first file management system in order for the consumer electronic product to receive data from the external data source, wherein the second file management system writes the data and associated metadata to the file system space.

23. The consumer electronic product as recited in claim 22, wherein the second file management system updates file system information using at least some of the metadata.

24. The consumer electronic product as recited in claim 23, wherein once the file management information is updated, the processor re-starts the first file management system that then manages the data written to the file system space by the second file management system.

25. The consumer electronic product as recited in claim 22, wherein the data received from the external data source is video data.