JPS63168743A - Control system for shared use of file for virtual computer system - Google Patents

Abstract

PURPOSE:To contrive to improve operability and to prevent file destruction by using a specific operating system so as to manage in the lamp an access request from plural operating system to a common file. CONSTITUTION:Since access from program a1, b1 is applied via a data management section 8, common use exclusive control is applied by a common use exclusive control function of a data management section 8. When a program a1 gives a request to access a record having a privately possessed file Y to a decision means 2, the decision means 2 checks a file magnagement table a and since the file Y is a private file, the processing request is applied to data management 9 of its own operating system OS-1.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a file sharing control method in a virtual computer system.

[Conventional technology]

Conventionally, in a system in which multiple operating systems share files and operate simultaneously on one computer, a so-called virtual computer system, the data management section of the operating system is used to communicate between programs running under one operating system. File sharing exclusive control is performed by the file sharing exclusive control function. But between programs running on different operating systems.

File sharing and exclusive control was not carried out, and users' operations were under pressure.

This will be explained with reference to the drawings.

Referring to FIG. 3, in the conventional technology, when a program a1 and a program a2 running on the operating system os-1 access the same file X, the data management section of the operating system ○s-i
Shared exclusive control is performed. However, program a1 runs under operating system 08-1 and program b1 runs under operating system os-2.
accesses the same file X.

Shared exclusive control is not performed.

[Problem that the invention seeks to solve]

In the conventional virtual computer system described above, there is a possibility that files may be destroyed if operated incorrectly.

Sufficient care and management are required during operation.

The disadvantage is that it places a heavy burden on the user.

[Means for solving problems]

The file sharing control method in the virtual computer system according to the present invention includes a file management table that manages whether a file is a shared file or a private file, and a file sharing control method based on the file management table when a program requests access to the file. a determining means for determining whether the file is a private file; a requesting means for requesting record processing for the shared file; and a notification means for detecting the request and notifying a specific operating system that collectively manages the shared file.

It has a service means that receives the notification and processes the shared file via the data management section.

〔Example〕

Hereinafter, nine embodiments of the present invention will be described with reference to the drawings.

With reference to FIG. 1, a virtual needle xi according to an embodiment of the present invention
The system has six operating systems 08-Q
, ○S-1, 08-2, and a virtual machine monitor VMM. The operating system os-1 has a program a1 running under it, and the operating system ○S-Q.

It has a program b1'fc running under it. The shared file X on the external secondary storage device is
The private file Y on the external secondary storage device is accessed only by the program a1. The operating system os-1 includes a file management table 1, a determining means 2. It has a requesting means 3 and a data management section 9. Operating system 08-
0 is the service means 5. Determination means 6. It has a file management table 7 and a data management section 8. or.

The virtual machine monitor VMM has notification means 4.

Referring to FIG. 2, an example of the contents of the file management table 1.7 is shown. The file management table 1.7 is created for each operating system. For every file accessed by an operating system, there is a file identifier and a shared file that distinguishes whether the file is a shared file accessed by multiple operating systems or a private file accessed by only one operating system. Private identification information is recorded in the file management tables 1 and 7.

Next, the operation of the present invention will be explained using FIG.

Program a under operating system os-1
1 makes a request to the determining means 2 to access a certain record of the shared file X, the determining means 2 examines the file management table 1 and determines whether the file X is a shared file or a private file. In this case, since it is a shared file.

The request means 3 is requested to process the shared file x'6 to the operating system O8-0 that collectively manages the shared file Xi.

The requesting means 6 assembles record processing request information consisting of file identification information and processing type information and notifies the notifying means 4 of the same.

The notification means 4 passes the record processing request information to the service means 5 of the operating system O8-0.

The service means 5 determines the file to be processed and the processing type from the record processing request information, and accesses the shared file X via the data management section 8.

When a program under operating system 06-2 accesses shared file X, it is done in exactly the same way.

On the other hand, when the program b1 under the operating system O8-0 makes a request to the determining means B to access a certain record of the shared file X.

The determining means 6 examines the file management table 7.

Knowing that the file X belongs to its own operating system 08-0, it accesses the shared file X via the data management unit 8.

In this way, access from programs a1 and bl is 1
Since both are performed via the data management section 8, the shared exclusive control is performed by the shared exclusive control function of the data management section 8.

When the program a1 makes a request to the determining means 2 to access a certain record in the private file Y.

The determining means 2 examines the file management table 1.

Since the file Y is a private file, a processing request is made to the data management 9 of the own operating system ○s-1.

〔Effect of the invention〕

As explained above, the present invention allows a specific operating system to centrally manage requests for access to shared files from multiple operating systems. Shared exclusive control can be performed in the same way as in , which has the effect of preventing file destruction and improving operability.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the configuration of a virtual computer system according to an embodiment of the present invention, FIG. 2 is a diagram showing an example of the contents of the file management table in FIG. 1, and FIG. 6 is a conventional virtual computer system. FIG. 2 is a block diagram showing the configuration of FIG. 1.7... File management table, 2, 6... Determination means, 3... Request means, 4... Notification means, 5...
Service means, 8.9...Data management department. File management Takefure management information record

Claims (1)

[Claims] 1. In a virtual computer system where multiple operating systems share files on one computer and operate simultaneously, whether the file is a shared file that is shared and accessed by multiple operating systems;
a file management table for managing whether the file is a private file accessed by only one operating system; and a determining means for determining whether the file is a shared file or a private file based on the file management table when a program requests access to the file. , a request means for requesting record processing for a shared file, a notification means for detecting the request and notifying a specific operating system that collectively manages the shared file, and a data management means for receiving the notification and performing processing on the shared file. 1. A file sharing control method in a virtual computer system, characterized in that a specific operating system collectively manages file access requests from a plurality of operating systems.