JP3606285B2 - Preventing misuse of shared files between multiple computer systems - Google Patents

Description

[0001]
[Industrial application fields]
The present invention relates to a method for preventing misuse of a shared file among a plurality of systems in which a part of an auxiliary storage device is shared by a plurality of computer systems adopting a virtual storage method, and a paging file unique to each system is created and used in the shared area. It is about.
[0002]
[Prior art]
When a part of an auxiliary storage device such as a magnetic disk memory is shared by a plurality of computer systems adopting the virtual storage method and a paging file unique to each system is created and used, for example, “Hitachi Program Product VOS3” As described on page 64 of the "/ AS System Generation" manual (1992), the paging file on the auxiliary storage device used in the virtual storage system must be created independently for each system so that it cannot be used simultaneously on multiple systems. It is common to become.
[0003]
[Problems to be solved by the invention]
However, when the computer system is started up, if the paging file used by another computer system is erroneously specified due to an operator's operation mistake, the contents of the paging file are destroyed.
[0004]
In this case, the computer system that has the right to use the paging file advances its own processing with the data in the main memory until the next access, and accesses the paging file when it becomes necessary to access the paging file. However, there is a problem that it takes time until it is found that the paging file is destroyed, and it becomes extremely difficult to find out that the cause of the destruction is an unauthorized use by another computer system.
[0005]
An object of the present invention is to provide a method for preventing misuse of a shared file between multiple systems, which can prevent a paging file created in a shared area on an auxiliary storage device from being erroneously used by a plurality of systems. .
[0006]
[Means for Solving the Problems]
To achieve the above object, according to the present invention, basically, when a paging file is created in the shared area of the auxiliary storage device, the computer system that intends to create the paging file stores the attribute information of the paging file. the identification information corresponding to each of the plurality of instruction processors included in the own computer system to the identification information storage area provided in the region advance to set, each of the plurality of instruction processors included in each computer system of the common region when using paging file, the computer system to try to use the paging file, after I write read identification information of the paging file to all of the plurality of instructions processors own computer system has , of the plurality of instruction processors which identification information is included in the own computer system its And wherein the to Rukoto use the paging file when matching the identification information corresponding to, respectively.
[0007]
[Action]
According to the above means, the attribute information storage area of the paging file is initialized in advance (for example, writing X′FF... F ′) by the computer system that is to create the paging file. Next, the identification information of the instruction processor of the computer system is set.
[0008]
Thereafter, when any of the computer systems uses the paging file, the identification information in the attribute information storage area is read. If the identification information matches the identification information of the instruction processor of the computer system, the computer system is allowed to use the paging file. However, if it does not match the identification information of the instruction processor of its own computer system, it is assumed that another computer system has a right to use and the use of the paging file is prohibited.
[0009]
This prevents the paging file created in the shared area in the auxiliary storage device from being mistakenly used by a computer system that does not have the right to use even if there is a mistake in the operation of the computer system operator. In addition, the paging file can be prevented from being destroyed.
[0010]
【Example】
Hereinafter, the present invention will be described in detail according to an embodiment shown in the drawings.
[0011]
Figure 1 is a hardware configuration diagram showing an embodiment of a computer system group including a plurality of computer systems 100a, 100 n of applying the present invention, the computer system 100a is constituted by a central processing unit 101a and the console device 104a Similarly, the computer system 100 n includes a central processing unit 101 n and a console device 104 n .
[0012]
In order to realize the virtual storage system, auxiliary storage devices 101a, 101b, and 101n including magnetic disk memories shared by the central processing units 101a and 101n and an auxiliary storage control device 103 are provided.
[0013]
Here, the console devices 104a and 104n are for monitoring the status of the central processing units 101a and 101n according to instructions from the program and the system operator.
[0014]
Among these, the central processing unit 101a includes an instruction execution processor group 10 including a plurality of instruction execution processors 10-1 to 10-n and a main storage device 11, as shown in FIG. Similarly, the central processing unit 101n is also configured.
[0015]
In this case, the number of instructions the processor Ru der to be determined as required.
[0016]
FIG. 3 shows the internal structure of the paging file 201 created on the shared area of the auxiliary storage device 102a. In the paging file 201, a file attribute information storage area 202 and a virtual storage information storage area 203 are set.
[0017]
In the file attribute information storage area 202, a used processor identification information record 204 is set as one record.
[0018]
FIG. 4 shows the structure of the used processor identification information record 204, in which processor identification information storage areas 301 corresponding to the maximum number of processors that can be used in the operating systems of the central processing units 101a and 101n are set.
[0019]
The contents of the initial state of the processor identification information storage area 301, a value that does not exist as a processor identification information, for example, as initial values Example 302, a value of "X'FF · · · F '" is set. The initial value is set during the creation of the paging file 201 by the central processing unit 101a or 101n to try to create a paging file 201.
[0020]
FIG. 5 is a flowchart showing the processing of each central processing unit 101a, 101n for preventing misuse of the paging file in the above configuration.
[0021]
Here, a case where the central processing unit 101a creates and uses the paging file 201 will be described as an example.
[0022]
First, when creating the paging file 201, the central processing unit 101a initializes the processor identification information storage area 301 and sets an initial value “X′FF... F ′”.
[0023]
Therefore, when using the paging file 201 by the central processing unit 101a, the central processing unit 101a is started up from the console device 104a, and all the instruction execution processors 10-1 to 10-n in the central processing unit 101a are instructed. Make it executable.
[0024]
Next, the central processing unit 101a first reads the used processor identification information 204 on the paging file 201 (step 401).
[0025]
Specifically, this is acquired by a hardware instruction as described on page 297 of the “Hitachi, Ltd. M series processor (M / ASA mode)” manual (1991).
[0026]
Next, the identification information of all the instruction execution processors 10-1 to 10-n constituting the started central processing unit 101a is extracted from a configuration information file (not shown) (step 402), and then the processor identification information record 204 The processor identification information stored in all the processor identification information storage areas 301 is read, and it is determined whether or not all the stored processor identification information is in the initial state (step 403).
[0027]
When all the processor identification information is in the initial state “X′FF... F ′”, the identification information of all the processors in the central processing unit obtained in step 402 is stored in the processor identification information storage area 301 of the paging file 201. (Step 404) and the startup processing of the central processing unit 101a is continued (step 406).
[0028]
However, if there is something in the processor identification information storage area 301 that is not in the initial state, it is compared whether it is identical to the identification information of all the processors obtained in step 402 (step 405).
[0029]
If the identification information is the same for all processors, it is determined that the same system has been restarted, that is, it is determined that the central processing unit 101a has been restarted after the paging file 201 is created, and the startup process is continued. (Step 406).
[0030]
On the other hand, if the identification information of all the processors is not the same, another central processing unit other than the central processing unit that created the paging file 201 is trying to use the paging file 201 illegally. A warning message is output to the console device 104a of the central processing unit 101a, and the system operator is warned that the paging file 201 created by the other central processing unit 101n may be shared, and the response from the console device 104a (Step 407).
[0031]
Here, when the processor identification information that does not match all, the (1) First at all up a different central processing unit the central processing unit writes the processor identification information and to execute the process of FIG. 5, (2 There are two cases when the number of instruction execution processors of the central processing unit to which the processor identification information is first written is changed at the second start-up.
[0032]
Therefore, the system operator may destroy the paging file 201 of another computer system if it corresponds to the warning message in the case of (1). Therefore, the system startup process started at this time is executed. Stop and investigate the cause of the warning message.
[0033]
On the other hand, if it corresponds to the warning message in the case of (2), only when it is recognized that the processor configuration has been changed since the previous system startup, the system startup operation is continued from the console device 104a. Instruct.
[0034]
In other words, when the system was started up with the configuration of n instruction execution processors at the time of the previous startup, when the configuration is changed to n-1 processors after the creation of the paging file 201, the determination at step 405 is made. However, all the processor identification information does not match, but only when the system operator recognizes this, the console device 104a instructs to continue the startup operation.
[0035]
The central processing unit 101a confirms the content of the response from the console device 104a (408). If an instruction to continue the startup operation is given, the processor identification information in the current processor configuration is stored in the paging file 201 in step 404. The data is stored in the area 301 (step 404), and the startup processing of the central processing unit 101a is continued (step 406).
[0036]
However, if it is not recognized that the processor configuration has been changed since the previous start-up, the central processing unit 101a is unreasonably sharing the paging file 201 created by the other central processing unit 101n. If it is determined, the start-up process of the central processing unit 101a is stopped and the cause is investigated (step 409).
[0037]
By executing such processing when each of the central processing units 101a to 101n is started up, even if there is an instruction mistake by the system operator, the paging file created by another central processing unit is unfairly used. This can prevent the destruction of the paging file 201.
[0038]
When the paging file 201 is created, the initial value is initially set in the processor identification information storage area 301. However, the paging file 201 may be set by immediately stopping the setting of the initial value and setting the processor identification information. Prevents misuse of files. However, since it is necessary to initialize the processor identification information storage area 301 from the console device, the system operator's burden is reduced by initializing the paging file 201 to the central processing unit itself. There are advantages.
[0039]
【The invention's effect】
As described above, in the present invention, when the paging file is created in the shared area of the auxiliary storage device, the identification information storage area provided in the attribute information storage area of the paging file is created in the computer system that intends to create the paging file. The identification information of the instruction processor of its own computer system is set in the identification information storage area, and when each computer system uses the paging file in the shared area, the identification information in the paging file is read and then the identification information is stored. Since the use of the paging file is permitted only when the information matches the identification information of the instruction processor of the own computer system, the paging file created in the shared area on the auxiliary storage device is erroneously used in multiple systems. Can be prevented by accidental operation of the system. Serious system failure when occurring can be prevented.
[Brief description of the drawings]
FIG. 1 is a hardware configuration diagram showing an embodiment of a computer system group to which the present invention is applied.
FIG. 2 is an internal configuration diagram of the central processing unit of FIG. 1;
FIG. 3 is an internal configuration diagram of a paging file.
FIG. 4 is an internal configuration diagram of used processor identification information;
FIG. 5 is a flowchart showing a processing procedure for verifying a shared state of a paging file.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 ... Instruction execution processor group, 10-1-10-n ... Instruction execution processor, 100a, 100n ... Computer system, 101a, 101n ... Central processing unit, 102a-102n ... Auxiliary storage device, 103 ... Auxiliary storage control device, 104a , 104n ... console device, 201 ... paging file, 202 ... file attribute information storage area, 203 ... virtual storage information storage area, 204 ... used processor identification information record, 301 ... processor identification information storage area, 302 ... initial value example.

Claims (1)

A method of preventing misuse of a shared file between multiple computer systems, in which a part of the auxiliary storage device is shared by a plurality of computer systems each having a plurality of instruction processors, and a paging file unique to each computer system is created and used in the shared area Because
Wherein the common area of the auxiliary storage device when creating a paging file, the computer system that attempts to create the paging file, wherein the the paging file own computer system to the identification information storage area provided in the attribute information storage area has the identification information corresponding to each of the plurality of instruction processors leave set, when each of the plurality of instruction processors included in each computer system uses paging file of the shared area, tries to use the paging file a computer system for, after I write read identification information of the paging file to all of the plurality of instructions processors own computer system has the plurality of instruction processors which identification information is included in the own computer system those of when matches the identification information corresponding to each Multiple computers misuse prevention method of intersystem shared files, wherein to Rukoto use the paging file.

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