JPH02299037A - File allocation processing system - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] 〔overview〕 For external storage devices such as disk storage devices.

Regarding a file allocation processing method in a computer system that allocates files to be created.

The purpose of this system is to enable flexible handling when there is insufficient space on an external storage device to which files can be allocated, and to simplify user programs and improve compatibility.

A group management table that manages information on grouping external storage devices according to arbitrary usage, a group definition processing unit that registers group definition information regarding external storage devices in the group management table, and a file creation request that Performs file allocation processing to a specified external storage device, and if allocation to the specified external storage device fails, the file allocation process is performed sequentially to other external storage devices in the group to which the specified external storage device belongs. and a file creation processing section that performs allocation processing.

[Industrial application field]

The present invention relates to a file allocation processing method in a computer system that allocates one file to be created to an external storage device such as a disk storage device.

[Conventional technology]

In a computer system, when creating a file for storing data in a disk storage device (including a removable disk storage medium), etc., the process is conventionally performed as follows.

Use the command to check the amount of free space to see how much free space is available on the disk storage device to which you want to allocate the file.

Based on the size of the free space, select a disk storage*2 that allows file creation, designate that disk storage device, and create a file.

[Problem to be solved by the invention]

According to the conventional method, a program that requests the system to create a file must refer to the free space information of the file allocation destination and specify the file allocation destination, which makes the processing of that program complicated. There was a problem.

Also, the part of the program that creates the file.

Since the system is aware of the disk storage device to which it is allocated, there is a problem in that the program must be modified when migrating to a system with a different disk configuration, such as the number of five units or each purpose. That is, information such as which disk storage device to try to allocate next if file allocation fails for a certain disk storage device.

Since complete management was required, it was necessary to take into account the differences in disk configuration for each system.

The present invention aims to solve the above-mentioned problems when the area of the external storage device to which files are allocated is insufficient.

The purpose is to enable flexible handling, simplify user programs, and improve compatibility.

[Means to solve the problem]

FIG. 1 shows an example of the configuration of the present invention.

In FIG. 1, 10 is an input device such as a keyboard, 11
1 is a processing device consisting of a CPU, memory, etc.; 12 is a group definition processing unit that processes group definition commands;
3 is the group management table.

14 represents a disk management block having control information for each disk storage device, 15 represents a file creation processing section, and 16 represents a disk storage device.

An example of allocating files to the disk storage device 16 as a typical external storage device will be explained below.External storage devices to which the present invention applies are not limited to the disk storage device 16; such as logical volumes and physical volumes. The same applies to the area management unit to which files are allocated.

In the present invention, one disk management block 14 is provided for each disk storage device 16. In the present invention, the disk storage device W16 can be used for each arbitrary purpose.

It is now possible to group, and its management information can be
It is stored as the group management table 13.

In this example, DISKI, DISK2. ..., DIS
Disk storage device lI with disk name Km! 16 are grouped to belong to group-1.

The group definition processing unit 12 updates the group management table 13 in response to the group definition command.

Disk storage device 16 specified for the specified group
This process performs the process of registering.

The file creation processing unit 15 performs file allocation processing to a specified disk storage device 16 in response to a file creation request by a file creation command, and if the allocation to the specified disk storage device 16 fails, , refer to the group management table 13 (including the disk management block 14) and check other disk storage devices 1 in the group to which the specified disk storage device 16 belongs.
Until the allocation of 1 to 6 succeeds or the allocation process for all disk storage devices in the group, 16, fails.
It is configured to perform sequential allocation processing.

Note that these commands can be input from the input device 10, and can also be started from a program.

[Effect]

The management of external storage devices in the system is facilitated by treating the disk storage devices 16 and the like to which files are assigned in groups and classifying them according to their uses.

On the other hand, user programs do not need to be aware of groups when creating files.

As in the past, if you first specify the name of the disk you want to create, the file will be allocated to the disk storage device with that disk name. and.

If the allocation fails, the process automatically moves to allocation to other disk storage devices 16 in the same group, so there is no need to perform a process of checking empty space in advance.

Group definition information can be registered arbitrarily for each system, so there is no need to modify the program that creates files even when migrating to a system with a different disk configuration.

〔Example〕

FIG. 2 shows an example of a disk management block used in an embodiment of the present invention, and FIG. 3 shows an embodiment of the present invention.

The disk management block 14 is a table containing control information for accessing the disk storage device 16. In this embodiment, as shown in FIG. 2, in addition to the disk name and various control information.

The first disk management block 14 in a group, which has a storage area for a group number and a right pointer and a left pointer for mutually pointing disk storage devices 16 belonging to the same group, is based on the entry for each group in the group management table 13. Points will be given.

The group definition command queues the disk management block 14 to the corresponding group.

Note that it is also possible to configure the group management table 13 and each disk management block 14 shown in FIG. 1 as an integrated table.

The processing at the time of file creation is as shown in FIG. 3, for example. (al~+fl in the following description corresponds to the processing Tal~ffl shown in FIG. 3).

(al Disc name rDIsK2J, rFILEI
File creation (
Assume that the CRTF I LE) command 30 is input. The file creation processing unit 15 first refers to the disk management block 14 of DISK2 and attempts to create a file in the disk storage device 16 having the name of DISK2.

8) If the file creation is successful, process 8 ends. If file allocation fails due to insufficient space, the process moves to the first process Tel.

fe) By following either the right pointer or the left pointer in the disk management block 14.

An attempt is made to create a file in the disk storage device 16 corresponding to the next disk management block 14 in the group.

(If the di file is created normally, the process ends. If the file allocation fails due to insufficient space, move to the secondary process (el).

+81 All disk memory words in group W16
Check whether allocation processing has been performed. Following the pointer in the disk management block 14.

When returning to the first disk management block 14.

Decide that the group has ended. If the group has not ended, control is returned to process C1 and the process is repeated in the same way.

(If the fl group ends, it is not possible to allocate a file to any disk storage device 16 in the group, so there is no free space to allocate.
Ends with error.

〔Effect of the invention〕

As explained above, according to the present invention, groups can be defined for each purpose, and if file allocation fails due to insufficient space, allocation is automatically performed to other devices within the same group. This makes it possible to create and use programs and operator operations in secret. In particular, management such as saving and restoring resources that require files can be easily performed.

Additionally, when migrating to a system with a different disk configuration, you can easily migrate by defining groups on that system without changing the program that creates files.

[Brief explanation of drawings]

FIG. 1 shows a configuration example of the present invention. FIG. 2 is an example of a disk management block used in one embodiment of the present invention. FIG. 3 shows an embodiment of the invention. In the figure, 10 is an input device, 11 is a processing device, 12 is a group definition processing section, 13 is a group management table, 14 is a disk management block, 15 is a file creation processing section, 16
represents a disk storage device.

Claims (1)

[Claims] In a file allocation processing method in a computer system that allocates files to be created to an external storage device (16), there is provided a group management method for managing information in which external storage devices are grouped according to arbitrary uses. a table (13); a group definition processing unit (12) that registers group definition information regarding external storage devices in the group management table; a file creation processing unit (15) that sequentially performs allocation processing to other external storage devices in the group to which the specified external storage device belongs if the allocation to the specified external storage device fails;
A file allocation processing method characterized by comprising: