JPH02190947A - File access processing system in system mounting different operating systems - Google Patents

Abstract

PURPOSE:To effectively utilize the capacity of an external storage device by providing the processing system with a volume control file for controlling an operating system(OS) controlling a file in the external storage device and a file access common processing routine for executing file access processing from a user program in common. CONSTITUTION:The different-OS mounting system for mounting plural different OSs is provided with the volume control file 8 for controlling which OS controls a file in the external storage device, a file control block 5 for controlling information for controlling I/O to/from the file stored in the external storage device and a file access common processing routine 4 for referring the file 8 at the time of opening a file to form the common file control block 5 to be used for plural OSs and executing common file access processing from user programs to be driven in respective OSs. Consequently, the need for logically dividing the area of the external storage is eliminated, the external storage device can be accessed only by specifying a file name and the capacity of the storage device can be effectively utilized.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a file access processing method in a system equipped with a different OS, and particularly relates to a data processing system (hereinafter referred to as OS) equipped with a plurality of different operating systems (hereinafter referred to as OS). The present invention relates to a file access processing method for files on the same external storage device managed by each OS in a system with different OS installed.

(Conventional technology) Conventionally, in this type of system equipped with different OSs, one external storage device is logically divided into multiple OS areas and managed using a management method unique to each OS, and user programs running on a certain OS are OS Ts'l managed by a different OS from
When accessing a file on area l, use this 03t
Files were accessed by specifying a logical device number (device name) and file name corresponding to the in area.

[Problem to be solved by the invention]

In the file access processing method in the conventional nOS-equipped system described above, each OS is directly connected to the same external storage device.
to manage. Since the s31 area was divided in advance, the OS area that can be used by one OS is limited, and if one OS uses all of that OS area, the OS area managed by a different OS may be The disadvantage is that even if there is free space left in the area, it cannot be used.

Additionally, when accessing files in an OS area managed by a different OS from a user program running on one OS, it is necessary to specify the logical device number (device name) and file name that correspond to the OS+1 area. Therefore, there is a drawback that it is necessary to keep in mind the logical device number (device name) in the user program.

In view of the above-mentioned points, an object of the present invention is to provide external writing +! To provide a file access processing method for a system equipped with a 5% OS that eliminates the need to logically divide an X device into areas and allows files managed by different OSs to be accessed by simply specifying the file name. There is a particular thing.

(Means for Solving Problem T!) The file access processing method in a system equipped with different OS of the present invention is such that in a system equipped with a different OS equipped with a plurality of different OS, files on an external storage device are managed by which OS. a polynym management file that manages information on the files on the external storage device, and a file control block that manages information that controls input/output to files on external storage devices.
a file access common processing routine that refers to the volume management file when opening a file, creates the file control n blocks common to 1M OSs, and commonly performs file access processing from user programs running on each OS; have

[Effect]

In the file access processing method in the system equipped with a different OS according to the present invention, the volume management file is stored in an external storage tQ.
'A The file control block manages the information that controls input/output to the file on the external storage device, and the file access common processing routine manages the volume control block when the file is opened. A file control block common to a plurality of OSs is created by referring to a management file, and file access processing from user programs running on each OS is performed in common.

〔Example〕

Next, the present invention will be explained in detail with reference to the drawings.

FIG. 1 is a block diagram showing the configuration of a file access processing method in a system installed with a different OS according to an embodiment of the present invention. (not shown)
Or a user program l running on 082 (not shown), a 031 file access processing routine 2 included in OSI and processing file access from user program l running on OSI, and 032 included in 032.
The OS2 file access processing routine 3 that processes file access from the user program 1 running on the 1st t1! (not shown)
File access common processing routine 4 that is loaded on top and performs file access processing common to OSI and OS2
, a file control block 5 that is created by the file access common processing routine 4 and manages information for controlling input/output to files, and a magnetic disk input/output interface 6 that interfaces with a magnetic disk 9 that is a volume on an external storage device. , volume management information 7 including information indicating the structure of a file existing at a predetermined location on the magnetic disk 9 and managed by OSI and information indicating the structure of a file managed by 032; It is composed of an OSt and a volume management file 8 that manages which OS (032) is managing files on the storage device.

Next, the operation of the file access processing method in the system with a different OS of this embodiment configured as described above will be explained.

Here, as shown in FIG. 1, files A and B managed by OSI are stored on the magnetic disk 9.
and files C and D managed by OS2 are stored, files A and B are stored in the volume management file 8, files C and D are stored in the volume management file 8, and files C and D are stored in the volume management file 8.
A case will be explained taking as an example a case where it is recorded that it is managed by S2.

When user program 1 is started on 031 and a file open request is issued from user program 1 to file 8, for example, the OSI file access processing routine 2 corresponding to 031 on which user program 1 is currently running is executed on OS 1. After performing its own file access processing, it recognizes the file name (A) and type of input/output operation (file open) specified by the user program 1, and transfers control to the file access common processing routine 4.

When the file control block 5 for the specified file 8 has not been created and the file 8 has not been opened, the file access common processing routine 4
The file name (
Search whether A) exists. If the specified file name (8) exists among the file names managed by the volume management file 8, the file access common processing routine 4 performs open processing for file A, and also opens the file from the volume management file 8. Knowing that the OS that manages 8 is OSI, and referring to the information indicating the structure of the file managed by 051 included in the volume management information 7, create the file 8 so that it is common to both OSI and OS2. Create a file control block 5 for the file.

After this, when a data input/output request is issued from the user program 1 to the file A, the OSI file access processing routine 2 corresponding to the OS 1 on which the user program 1 is currently running performs 031-specific file access processing. Afterwards, the file name (A) specified by the user program 1 and the type of input/output operation (data output) are recognized, and control is transferred to the file access common processing routine 4.

The file access common processing routine 4 uses the Q disk input/output interface 6 based on the information in the file system '4n block 5 regarding the already created file A.
Data input/output processing for file A is performed via.

On the other hand, when a file open request for, for example, file C is issued from user program 1 running on 031, user program 1 is currently running on 031.
OSI file access processing routine 2 corresponding to S1
After performing OSl's own file access processing,
Recognizes the file name (C) and type of input/output operation (file open) specified by the user program l,
Control is transferred to file access common processing routine 4.

When the file control block 5 for the specified file C has not been created and the file C has not been opened, the file access common processing routine 4
The volume management file 8 is traced from the volume management information fi 17 of the magnetic disk 9 to search whether the specified file name (C) exists among the file names managed by the volume management file 8. If the specified file name (C) exists among the file names managed by the volume management file 8, the file access common processing routine 4 performs oven processing for the file C, and also extracts the file from the volume management file 8. Knowing that the OS that manages C is OS2, referring to the information indicating the structure of the file managed by 052 included in the volume management information 7, create the file C so that it is common to both OSes 031 and 032. Create a file control block 5 for the file.

After this, when a data input/output request is issued from user program 1 to file C, 031 file access processing routine 2 corresponding to OS 1 on which user program 1 is currently running performs file access processing unique to 0S1. Later, the file name (C) specified by the user program 1 and the type of manual saw operation (data input/output) are recognized, and the file access common processing routine 4 is executed.
without transferring iν control to.

The file access common processing routine 4 performs data input/output processing for the file C via the magnetic disk input/output interface 6 based on information in the file system '4n block 5 regarding the file C that has already been created.

Note that when a file close request is issued from user program 1 running on OSI to file Jshi8 (or C), user program I executes the OS1 file access processing routine corresponding to the OSI currently running. 2, after performing OS1-specific file access processing, the file name (A) (or (C)) and input/output operation type (file close) specified by the user program I are set to 1131i, and file access common processing is performed. Control is transferred to routine 4.

The file access common processing routine 4 performs closing processing of the specified file A (or C), and
Delete file control block 5 for file 8 (or C).

By the way, user program 1 running on OSl is 0.
The case where the user program l running on 052 accesses the file A managed by OSI and the file C managed by 032 has been explained.
Of course, the same operation occurs when accessing a file managed by S2.

In addition, in the above embodiment, the case where there are two OSs installed in the system equipped with different OS was explained as an example.
It goes without saying that the present invention is equally applicable even if the number of OSs installed is three or more.

〔Effect of the invention〕

As explained above, the present invention provides a volume management file that manages which OS is managing files on an external storage device, and a file control common to multiple OSs that refers to the volume management file when a file is opened. By providing a file access common processing routine that creates blocks and performs common file access processing from user programs running on each OS,
It is no longer necessary to logically divide the external storage area into areas as in the past, and there is an effect that eight units of the external storage device can be used effectively.

In addition, it is no longer necessary to be aware of the logical device number (device name) of the external storage device depending on the OS, as in the past, and files managed by different OSs can be accessed by simply specifying the file name from the user program. This has the effect of being accessible.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the configuration of a file access processing method in a system equipped with a different OS according to an embodiment of the present invention. In the figure, these are a user program, an OS1 file access processing routine, an OS2 file access processing routine, a file access common processing routine, a file control block, a magnetic disk input/output interface, volume management information, a volume management file, and a magnetic disk.

Claims (1)

[Scope of Claims] In a system equipped with a different OS that is equipped with a plurality of different OSes, there is provided a volume management file that manages which OS is managing files on an external storage device, and an input file for files on the external storage device. A file control block that manages information that controls output, and multiple O
a file access common processing routine for creating the file control block common to S and commonly performing file access processing from user programs running on each OS; .