File manager for files shared by heterogeneous clients

• US 5,535,375 A
• Filed: 10/11/1994
• Issued: 07/09/1996
• Est. Priority Date: 04/20/1992
• Status: Expired due to Fees

• Current Assignee: International Business Machines Corporation
• Original Assignee: International Business Machines Corporation
• Inventors: Eshel, Marc M., Jones, Donald N., Hunt, Guerney D. H., Schwartz, Frederick A., Meyer, Christopher
• Primary Examiner(s): Eng, David Y.
• Application Number:
  US08/320,768
• Time in Patent Office: 637 Days
• Field of Search: 395/200.01, 395/375, 395/500, 395/650
• US Class Current: 703/27
• CPC Class Codes: G06F 16/1794 Details of file format conversion
• CPC Class Codes: G06F 16/1824 implemented using Network-attached Storage [NAS] architecture distributed or networked storage systems G06F3/067; protocols for distributed storage of data in a network H04L67/1097

Abstract

A computer system manages files shared by first and second heterogeneous clients. The first client exhibits a first protocol such as SMB and the second client exhibits a second, different protocol such as NFS. A first protocol converter receives requests from the first client to create, read and update the files, and converts the requests to corresponding requests exhibiting a common protocol. A second protocol converter receives requests from the second client to create, read and update the files, and converts the requests to corresponding requests exhibiting the common protocol. A file manager is common to both clients and both protocol converters, receives the converted requests exhibiting the common protocol and executes the requests in a name space and data area which are both common to the first and second clients. The name space stores names of the files and the data area stores the files. The file manager provides access by each of the clients to files and names of the files created by the other client. A common lock manager is provided for the common name space and common data area. The system also supports second and third name spaces and data areas dedicated to the first and second clients, respectively.

Claims

1. A computer comprising:

means for storing in a common storage area a multiplicity of data objects having at least two different data formats and a directory listing said data objects;

first and second protocol converter means, coupled to receive requests exhibiting first and second different protocols from first and second clients, respectively to read said directory, for converting said requests into a common protoco, said first and second clients having respective first and second, different data formats;

file manger means, coupled to receive the converted requests exhibiting said common protocol from both protocol converters, for furnishing to each of said first and second clients a respective list of data objects having names compatible with the respective data format and not furnishing to each of said first and second clients a respective list of data objects not having names compatible with the respective data format;

said first protocol converter means converts and said file manager means executes a request exhibiting said first protocol from said first client to rename a data object in said directory from a name having a data format compatible with the data format of said first client but incompatible with the data format of said second client to another name having a data format compatible with both said first and second clients such that said first and second clients can access said data object with said other name after the renaming.

2. A computer system as set forth in claim 1 further comprising lock manager means, common to both protocol converters and callable by both protocol converters with said common protocol, for locking said directory and all of said data objects throughout said common storage area during access by either of said clients to said directory prevent conflicting access by the other client.

3. A computer system as set forth in claim 1 wherein said protocol converter means convert and said file manager means executes requests by each of said clients to delete a data object created by the other client provided a name of said data object created by said other client has a data format compatible with the data format of the client requesting deletion.

4. A computer system as set forth in claim 1 wherein

said file manager means also manages access by said first client to a second storage area for names of other data objects and said other data objects dedicated to said first client and not accessible by said second client.

5. A computer system as set forth in claim 4 wherein

said first client makes said requests to said first protocol converter means to access said second storage area using said first protocol and said first protocol converter means converts said requests to requests exhibiting said common protocol and passes the converted requests exhibiting said common protocol to said file manager means for execution.

6. A computer system as set forth in claim 1 wherein said first client exhibits an SMB protocol and said second client exhibits an NFS protocol.

7. A computer system as set forth in claim 1 wherein said file manager means executes within a host computer, said first client is a remote workstation or personal computer and said second client is an application executing within said host computer.

8. A computer system as set forth in claim 1 further comprising routing program means, coupled to receive said requests from said first and second clients exhibiting said first and second protocols, respectively, for routing said requests to said first and second protocol converters, respectively, based on the type of client which makes said request.

9. A system as set forth in claim 1 wherein:

said first and second protocol converter means convert and said file manager means executes requests exhibiting said first and second protocols from said first and second clients, respectively, to read and write files in the respective lists furnished to said first and second clients.

10. A method for managing data access requests by first and second clients exhibiting first and second different, respective communication protocols and first and second respective different, but partially compatible data formats, said method comprising the steps of:

storing data objects and a directory listing said data objects in a common storage area;

converting into a common protocol a request received from said first client to rename a data object created by said second client to a name which is incompatible with the data format of said second client; and

executing the converted rename request by changing the name of the respective data object in said directory and subsequently denying access by said second client to said renamed data object even though said renamed data object is still stored in said common storage area.

11. A method as set forth in claim 10 wherein the step of denying access to said second client comprises the step of denying a directory listing of said renamed data object to said second client.