JPH01320523A - Electronic computer - Google Patents

Abstract

PURPOSE:To reduce the number of times of input/output processings by preparing an auxiliary memory device, and providing a file managing part stored in the memory device and a storage unit sharing information storage part between files at every storage unit to be used by the file at the managing part. CONSTITUTION:In the case of duplicating a source file shown in an identification number #1 on a target file shown in a file identification number #2, a file managing program 3 allocates target file managing information 11b on an auxiliary storage area 6 newly. Next, logical block numbers #1, #2, and #3 stored in a storage area information part 15a are written on an information part 15b. Next, the shared flags 17a and 17b of the storage unit sharing information storage parts 16a and 16b are set, respectively, and the file identification numbers #2 and #1 sharing the logical blocks #1, #2, and #3 are registered on shared file information parts 18a and 18b. In such a way, since input/output according to the duplication of the logical block is performed, it is possible to reduce the number of times of effective input/output.

Description

[Detailed description of the invention] Industrial applications The present invention relates to an electronic computer equipped with an auxiliary storage device.

2. Description of the Related Art Magnetic disk drives and magnetic tape drives have been widely used in electronic computers as auxiliary storage devices for data storage. Operating systems employ a method of managing storage areas by dividing the storage areas of these storage media into several logical storage units and allocating them as data storage areas for files. In such a method, the data of a file can be referenced by registering the logical storage unit number in the management information section of the file.

When copying data between files, first read the data from the corresponding logical storage unit of the source file onto main storage, then allocate a new logical storage unit to the target file and write the previous data to it. This was achieved by doing this.

Problems to be Solved by the Invention However, in the conventional technology, when copying file data, a new logical storage unit for data storage is allocated, which consumes a large amount of auxiliary storage area and further increases the number of input/output operations. was there.

The present invention has been made in view of the above circumstances, and its purpose is to share logical storage units in which data is stored between files, thereby achieving efficient use of storage areas and providing input/output An object of the present invention is to provide an electronic computer that can reduce the number of times of processing.

Means for Solving the Problems The present invention has an auxiliary storage device, a file management section stored in the storage area of the auxiliary storage device, and a file management section that stores information between files for each storage unit used by the file. An electronic computer characterized by comprising a memory unit shared information storage section.

By providing an inter-file storage unit sharing information storage section for each storage unit used by the working file, unnecessary data copying between files can be avoided (and efficient use of auxiliary storage area and input/output can be achieved). Enables reduction of processing times.

EXAMPLES Hereinafter, details of the present invention will be explained based on examples. 1st
The figure shows the configuration of an embodiment of a computer according to the present invention, in which 1 is a central processing unit, 2 is a main storage device, 3 is a file management program, a RAM, and 4 is an auxiliary storage device management device. It controls an auxiliary storage device 5 such as a magnetic disk device or a magnetic tape device. 6 is an auxiliary storage area provided on the auxiliary storage device 5; 7 is a terminal control device that controls the terminal device 8; 9 is a system bus. Figure 2 shows
It is a conceptual diagram of a configuration example of the above-mentioned auxiliary storage area 6, on which a file management information section 10 and a data storage area 12 are installed.
will be established. The data storage area 12 is composed of several logical storage units 13.

FIG. 3 is a conceptual diagram of a configuration example of the file management information 11, in which 14 is a file identification number, 15 is a storage area information section,
16 is a storage unit shared information storage unit, 17 is a shared flag, 1
8 is a shared file information section. The file data copying operation will be described below with reference to the illustrated embodiment.

First, the case where the source file represented by the file identification number #1 is transferred to the target file represented by the file identification number #2 will be explained using FIGS. 4 and 5. Upon receiving the copy request, the file management program 3 newly allocates the target file management information 11b onto the file management information section 10b on the auxiliary storage area 8. Next, the logical block number #1. stored in the storage area information section-15a indicating the data storage location of the source file. #2. #3 is written to the storage area information section 15b of the target file. Next, a storage unit shared information storage unit 1 provided corresponding to each logical block
Set the shared flags 17a and 17b of 6a and 16b, and write logical block 0 to shared file information section 18a and isb.
．． #2゜File identification number #2 that shares #3. #
Register 1. When a request is made to rewrite the data of the file copied in this way, for example, when a request is made to rewrite the data corresponding to logical block number #3 in the aforementioned file 2, FIGS. Explain using. The file management program 3 reads out the file management information 11b. Since the shared flag 17b is set for logical block number #3, an unused logical block, for example, logical block #4 in this example, is allocated. Then, the shared file information sections 18a and 18b are updated to number #11 and number #2, respectively.

In this way, when copying a file, instead of allocating a new storage unit, the storage unit is shared until one of the files is written, making it possible to use the auxiliary storage area efficiently. Since input/output accompanied by copying of necessary logical blocks is performed only when writing actually occurs, the effective number of input/outputs can be reduced.

Effects of the Invention As explained in detail above, the present invention provides a file management unit with an inter-file storage unit sharing information storage unit for each storage unit used by the file, thereby eliminating unnecessary data between files. This has the advantage of making it possible to efficiently use auxiliary storage space and reduce the number of input/output operations without copying data.

[Brief explanation of the drawing]

FIG. 1 is a basic configuration diagram of a computer used in an embodiment of the present invention, FIG. 2 is a conceptual diagram of an example of the configuration of the above-mentioned auxiliary storage area, and FIG. 3 is a configuration of a file management information storage unit. The conceptual diagrams of the examples, FIG. 4, FIG. 5, FIG. 6, and FIG. 7 are each conceptual diagrams of file management information. 1...Central processing unit, 2...Main storage device, 3...File management program, 4...
... Auxiliary storage management device, 5 ... Auxiliary storage device, 6 ... Auxiliary storage area, 7 ... Terminal control device, 8 ... Terminal Device, 9...
system bus. Name of agent: Patent attorney Toshio Nakao and 1 other person Figure 1 ＼ q＞人TEMHA人Figure 7 Hato % ＼ ＼ Kō (.

Claims (1)

[Claims] It has an auxiliary storage device, and includes a file management section stored in the storage area of the auxiliary storage device, and a storage unit for storage unit sharing information between files for each storage unit used by the file. An electronic computer featuring: