JPS61194546A - Shared file control system - Google Patents

Abstract

PURPOSE:To effectively perform the exclusive control of shared files in a data processing system by equipping a file control unit with a control table for sorting file blocks on a basis of file names. CONSTITUTION:The control table 12 consists of a verification table 121 and sorting table 122. The table 121 features file names and also defines a byte position and bit position which are effective to equally distribute the load of the file names used in the system. The verification bit defined by this table 121 verifies file names of a receiving command and groups them. The table 122 defines the selection of occupied information memories 141-144 on the basis of the grouped information verified by the table 122. This table allows the sorting and recording of files and the easy retrieval of information occupying a file block; thus the performance can be improved.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] This invention relates to an exclusive control method for shared files in a file sharing system in which a file is shared by a plurality of data processing devices.

[Conventional technology]

Conventionally, various multiprocessor systems, that is, systems that combine multiple data processing devices, have been devised for the purpose of improving system reliability or performance, and files are also operated in the form of file sharing using a shared file device. . ′ in such multiprocessor systems.

While a task in one data processing device occupies a file block and performs reference or update processing on that file block, the file block is not in use to other tasks or other data devices and is waiting. It is necessary to perform exclusive control processing to request this.

[Problem that the invention seeks to solve]

For this reason, in some types of systems, data processing devices communicate closely with each other by performing host-to-host communication to perform exclusive control processing. however,
If the object of exclusive control is changed from a file unit to a file block unit, which is a smaller unit that constitutes a file, frequent communication between data processing devices becomes necessary.

There was a drawback that the performance of the entire data processing system decreased (for example, "Multiprocessors and Parallel Processing" translated by Hiroshi Muraoka (September 5, 1980), Kindai Kagakusha, P.
245-P265).

[Means for solving problems]

An object of the present invention is to configure a plurality of storage units for storing the occupancy status of file blocks.

A shared file control system that solves the above drawbacks and efficiently performs exclusive control of shared files in a data processing system is provided by providing a file management device equipped with a control table for classifying file blocks based on file names. It is about providing.

According to the present invention, based on a command input from at least one of the plurality of data processing devices.

at least one shared by all its data processing devices;
at least one file control device having a function of referencing or updating one file block;

At least one file connected to the file management device, which drives a medium including the file block in response to an instruction from the file control device based on the command, and reads file block information or writes file block information. with access equipment.

and a file management device connected to all the data processing devices.

The file management device includes input/output means that is connected to all of the data processing devices and controls input/output to and from the data processing devices, and corresponds to file blocks that are read or written by the file access device.
a plurality of occupancy information storage units that store occupancy information of the file block; but.

It has: a control table that determines which one of the plurality of occupancy information storage units corresponds to the storage unit; and a control unit that analyzes and processes commands from the data processing device.

When multiple data processing devices search the storage unit based on the file name of a shared file and perform exclusive control of the file, it facilitates the search process by referring to the control table, and is also used in the system. By performing appropriate classification based on shared file names, a shared file control system is obtained that is characterized by operating to equalize loads.

[Example] Next, an example of the present invention will be described with reference to two drawings.

FIG. 2 shows an example of a data processing system including a shared file control system according to one embodiment of the present invention. In this example, two data processing devices 21 and 22 are loosely coupled and are subordinate to l? This shows a case where IJ neem media 51 and 52 are shared.

First, the data processing device 21
7) A 7-aisle flock 511 shall be used. The data processing device 21 locks B with information such as the file name and block name of the file block 511 to be used, the host ID of the data processing device 21, and the task ID.
A Lock command is issued to the file management device 1. If exclusive permission is granted by the file management device 1, the data processing device 21
is a file control device 3 having a connection to a file access device 41 in order to process a file block 511.
1 or file control device 32 and press
The file block 511 of "File A" included in the J neem 51 is referenced or updated. In this case, it is assumed that "File A" is composed of a file block 511 and a file block 512 in the volume medium 51 and a file block 523 in the volume medium 52.

While the data processing device 21 is executing the process of referencing the file block 511, another task of the data processing device 21 or another data processing device 22 requests to refer to the file block 511.

When a Lock BLock command is issued to the file management device 1, the file management device 1 allows exclusive use if the file can be shared and referenced, thereby attempting to share the file. If the request to the file block 511 is an update request, the use of the file block is reported in response to the Lock BLock command until the file block 511 is released from use.

The data processing device 22 or task that has been notified of waiting due to being in use must either wait for an interrupt report of being released from being in use, or must periodically reissue the command. In the case of the file management device of this embodiment, an interrupt report of cancellation during use is performed. When the data processing device 21 completes the reference or update processing regarding the file block 511, the data processing device 21 again requests the file management device 1 to
- Issues the U〆Lock Blocks command and performs the process of canceling the use of the file block 511.

FIG. 1 shows a file management device 1 used in the shared file control system of FIG. The input/output control unit 11 is a circuit that performs interface control with a plurality of data processing devices 21 and 22. Control of the file management device 1 is performed by a microprogram in a control memory in a processing control section 13. The processing control unit 13 is controlled by the input/output control unit 11 based on the microprogram.

When activation from the data processing device 21 or 22 is detected, the microprogram instructs selection of the data processing device in a predetermined order, drives the interface circuit, and receives the command. The processing control unit 13 analyzes the command received by the input/output control unit 11. The requested command is locked
It is a BLACK command.

Processing control unit 13 via input/output control unit 11.

Argument information related to the Lock BLock command is received, and the host ID and task ID that identify the data processing device that issued the command, the name of the file to be occupied, and the name of the file block are analyzed.

The file management device 1 includes a storage unit 14 that is configured to be able to refer to the information of all the file blocks shared by the data processing system using the file name as a key, and records the occupancy information of all the file blocks. The storage part 1
4 further includes a plurality of occupancy information storage units 141.142.14.
3.144. Received Lock B
When the Lock command is for file block 511.

The processing control section 13 indexes the control table storage section 12 using "File A" which is the file name of the file block 511 as a key, and selects the occupancy information storage section regarding "File A". “File A” is the occupancy information storage unit 142
If it belongs to the occupancy information storage unit 1, the processing control unit 13
42 to obtain information regarding the file block 511. If it is not registered, it is newly registered, and if it is already registered, it is checked whether it is in use.

If it is newly registered or unused, it is determined that it is possible to occupy it, creates a completion report in response to the Lock BLock command, and reports permission for occupancy to the requesting data processing device via the input/output control unit 11. When the file block 511 is in use, unless simultaneous processing such as reference is possible,
A termination report indicating that it is in use and requesting a wait is created and is reported to the requesting data processing device via the input/output control unit 11.

FIG. 3 shows the occupancy information storage unit 141 based on the file name.
．． This is an example of the control table storage unit 12 for selecting 142.143.144.

The control table 12 is composed of a verification table 121 and a classification signal 12202. The verification table 121 characterizes the file name (in the case of this embodiment, 8-byte information) and defines byte positions and bit positions that are effective in equally distributing the load of file names used in the system. table and verification table 12
The file name of the received command is verified by the verification bit defined in 1 and grouped. Classification Chisol 122
is based on the information grouped as a result of the verification,
Multiple occupancy information storage units 141゜142.143.14
This is a table that defines the selection of No. 4. By classifying and recording files using this control table, it is possible to easily search for occupancy information for file blocks during exclusive control processing, thereby improving performance.

〔Effect of the invention〕

As explained above, the present invention uses file name classification in a file management device. Easy exclusive control of occupancy in shared file control systems by storing occupancy status,
This has the effect of improving the performance and reliability of the data processing apparatus in a loosely coupled state by reducing the overhead of the data processing apparatus and integrating file sharing.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an example of a file management device used in the present invention, FIG. 2 is a block diagram showing a data processing system using a shared file control system according to an embodiment of the present invention, and FIG. 3 is a control table. It is a block diagram which shows an example. 1... File management device, 11... Input/output control unit. 12... Control table storage unit, 13... Processing control unit. 14...Storage unit, 21.22...Data processing device. 31, '32...File management device, 41.42...
・File access device, 51.52...? volume medium, 121...verification table, 122...classification table, 141.142.143,'144...occupancy information storage unit +511,512+'513+521t5
22+523...File block. Figure 3 121...ne* evidence table 122 face cheek table

Claims (1)

[Claims] 1. A function for referencing or updating at least one file block shared by all the data processing devices based on a command input from at least one of the plurality of data processing devices. at least one file control device having a drive control device, which is connected to the file control device and drives a medium including the file block in response to an instruction from the file control device based on the instruction, and reads file block information or controls the file. at least one file access device that writes block information; and a file management device connected to all the data processing devices, the file management device connected to all the data processing devices and capable of data processing. An input/output means for controlling input/output with the device, and a file block read or written by the file access device,
a plurality of occupancy information storage units that store occupancy information of the file block; has a control table that determines which one of the plurality of occupancy information storage units corresponds to, and a control means that analyzes and processes commands from the data processing device, When the data processing device searches the storage unit based on the file name of the shared file and performs exclusive control of the file, it facilitates the search process by referring to the control table. A shared file control system that operates to equalize loads by appropriately classifying files based on file names.