Method and apparatus for extending traditional operating systems file systems

• US 6,298,390 B1
• Filed: 03/26/1996
• Issued: 10/02/2001
• Est. Priority Date: 11/22/1995
• Status: Expired due to Term

• Current Assignee: Sun Microsystems Incorporated (Oracle Corporation)
• Original Assignee: Sun Microsystems Incorporated (Oracle Corporation)
• Inventors: Bernabeu-Auban, Jose, Shirriff, Kenneth W., Khalidi, Yousef A., Matena, Vladimir, Thadani, Moti N.
• Primary Examiner(s): Maung, Zarni
• Assistant Examiner(s): Caldwell, P
• Application Number:
  US08/621,536
• Time in Patent Office: 2,016 Days
• Field of Search: 395/683, 709/300-305, 709/310-332
• US Class Current: 719/315
• CPC Class Codes: G06F 12/0866 for peripheral storage systems, e.g. disk cache
• CPC Class Codes: G06F 16/10 File systems; File servers
• CPC Class Codes: G06F 2212/311 In host system

Abstract

In a computer system having a kernel supporting an interface definition language, a file system composed of an object framework. The object framework includes a set of proxy vnodes, a set of memcache vnodes, and a set of storage vnodes. The set of proxy vnodes and the set of memcache vnodes are linked to the set of storage vnodes through the use of the interface definition language, and the set of proxy vnodes are linked to the set of memcache vnodes through the use of a set of pointers. Each proxy vnode of said set of proxy vnodes is typed so as to differentiate between a set of file system objects such as files, directories and devices. The set of memcache vnodes forms an interface to a virtual memory system while the set of storage vnodes forms an interface to an underlying file system. The file system also uses a set of file paging interfaces that support extensions to the file system while providing full coherence of data.

Claims

1. In a computer system having a kernel supporting an interface definition language, a file system comprising:

an object framework, said object framework including;

a set of proxy vnodes;

a set of memcache vnodes; and

,

a set of storage vnodes;

wherein both said set of proxy vnodes and said set of memcache vnodes are coupled for communication with said set of storage vnodes through the use of said interface definition language, and said set of proxy vnodes are coupled for communication with said set of memcache vnodes through the use of a set of pointers.

2. The file system of claim 1, wherein each proxy vnode of said set of proxy vnodes is typed so as to differentiate between a set of file system objects.

3. The file system of claim 2, wherein said set of file system objects include files, directories and devices.

4. The file system of claim 1, wherein said set of memcache vnodes forms an interface to a virtual memory system.

5. The file system of claim 1, wherein said set of storage vnodes forms an interface to an underlying file system.

6. The file system of claim 1, further comprising a set of file paging interfaces that support extensions to said file system while providing full coherence of data.

7. The file system of claim 1, wherein said interface definition language supports coherent sharing of files between said kernel and object oriented operating systems.

8. The file system of claim 1, wherein said interface definition language supports sharing of files among heterogeneous operating systems.

9. The file system of claim 1, wherein said interface definition language supports evolution of an interface of said file system by inheritance such that said file system can support multiple revisions of said file interface.

10. The file system of claim 1, wherein said file system is implemented in a user process of said computer system.

11. The file system of claim 1, wherein said interface definition language supports distribution of parts of said file system transparent to a file system developer.

12. The file system of claim 1, wherein said computer system is a distributed computer system with a plurality of computers.

13. The file system of claim 1, wherein each proxy vnode of said set of proxy vnodes;

each memcache vnode of said set of memcache vnodes; and

each storage vnode of said set of storage vnodes is selectively located in a first address space;

a second address space; and

a third address space.

14. The file system of claim 1, wherein said file system is split into:

a first layer having a first proxy vnode of said set of proxy vnodes, a first memcache vnode of said set of memcache vnodes, and a first storage vnode of said set of storage vnodes; and

,

a second layer having a second proxy vnode of said set of proxy vnodes, and a second memcache vnode of said set of memcache vnodes.

15. The file system of claim 14, wherein said first layer is configured for compressing of any file data received from said second layer and decompression of any file data sent to said first layer.

16. The file system of claim 14, wherein said first layer coherently caches file data and acts as a pager for supplying file data to said second layer.

17. The file system of claim 14, wherein said second layer coherently caches file data from said first layer and acts as a pager for supplying file data to a third layer.

18. A method for defining a file system for a computer system having a kernel supporting an interface definition language, comprising the steps of:

defining an object framework including a set a proxy vnodes, a set of memcache vnodes, and a set of storage vnodes;

linking both said set of proxy vnodes and said set of memcache vnodes to said set of storage vnodes through the use of said interface definition language; and

,

linking said set of proxy vnodes to said set of memcache vnodes through the use of a set of pointers.