JPH08314792A - Input/output system for computer system - Google Patents

Abstract

PURPOSE: To quickly and safely stop/restart the input/output system with an application program operated. CONSTITUTION: When accepting a start request from an input/output system manager MG, a start/stop request interface program 2 executes a generation management update routine 21 to update the generation information 51. When accepting an input/output request from an application program 3, an input/output request interface program 4 executes a generation management guard routine 41 and refers to generation information 51 to discriminate whether it is an input/output request to a management storage area 6 after restart or not. If it is an input/output request to the management storage area 6 before restart, the access to the management storage area 6 is rejected to prevent the wrong access. Meanwhile, if it is an input/output request to the management storage area 6 after restart, the access to the management storage area 6 is permitted.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an input / output system in a computer system, and more particularly, it can be stopped / restarted while the computer system is in operation for the purpose of changing SG parameters. Regarding output system.

[0002]

2. Description of the Related Art This type of input / output system temporarily stores various data requested by an application program for input / output in a buffer memory, that is, a storage area managed by the system (hereinafter referred to as a management storage area). hand,
It is software that efficiently controls the exchange of data between the central processing unit and the input / output device of computers with different processing speeds. Among such input / output systems, for example, JP-A-5-274269 and JP-A-3-94 are available.
Some of them have a security guard function for suppressing unauthorized (intentional) computer access by unauthorized users, as described in Japanese Patent Laid-Open No. 44-44.

By the way, under multi-tasking (multi-programming), it is desirable to change (enlarge or reduce) the size of the management storage area according to increase / decrease of application programs using the input / output system, usage and functions. May be For example, when increasing the number of application programs that use the I / O system at the same time or when starting a database application, it may be preferable to expand the management storage area in advance. When starting an application whose main purpose is calculation, the efficiency may be improved by reducing the management storage area in advance and expanding the working area by that amount.

The size of the management storage area can be changed by changing the SG parameter.
Normally, the parameters can be changed only after the input / output system is temporarily stopped and the management storage area is once opened. Conventionally, when changing the SG parameter, even if the computer system (OS) can be stopped / restarted even when the computer system (OS) is operating, the system is used prior to the stop of the input / output system. Waiting for the end of all application programs
The program was forcibly terminated. Thus, the reason why the input / output system is stopped / restarted after waiting for the end of all the application programs is that the management storage area is released by stopping the input / output system.
Since the management storage area is reacquired by the restart, if the application program is kept running, the management storage area allocated before the restart (after the restart, it will be allocated to another application program) This is because there is a risk of confusing by accidentally accessing (the area in which it is present), and for preventing such confusion.

[0005]

However, with the former method of simply waiting for the end of all application programs, the input / output system cannot be stopped quickly, and an application program that is stalled due to a failure may be lost. If so, it is no longer possible to stop the I / O system. On the other hand, the latter method of forcibly terminating all application programs has the advantage of being able to stop the I / O system quickly, while using the I / O system only at the beginning,
After that, even for application programs that are not used, they are forcedly terminated uniformly, and there is a problem that they lack concrete validity.

The present invention has been made in view of the above circumstances, and is a computer that can be stopped / restarted quickly and safely while the application program is running.
It is intended to provide an input / output system in the system.

[0007]

In order to solve the above problems, the invention according to claim 1 is an input / output system capable of stopping / starting itself while a computer system is in operation. Operation information storage means for storing operation information indicating whether or not the input / output system is in operation,
Generation information storage means for storing generation information of the input / output system; generation management update means for updating generation information stored in the generation information storage means each time the input / output system is activated; The start / stop request interface that acquires the management storage area when the output system is started, and releases the management storage area when the output system is stopped, and any application application while the input / output system is running.
When there is an input / output request from the program, if the generation information copy does not exist in the management information of the application program, the generation information copy of the input / output system is added to the management information and then the application program Input / output request of the application program is permitted, and if the management information of the application program has a copy of generation information that matches the generation information stored in the generation information storage means, the input / output request from the application program is permitted. However, if the management information of the application program contains a copy of generation information that does not match the generation information stored in the generation information storage means, the generation management guard means rejects the input / output request from the application program. And the application by the generation management guard means When the input / output request from the program is permitted, the management storage area is accessed according to the input / output request of the application program, and the result is notified to the application program, while the generation management guard means causes the application program to be accessed. When the input / output request from the device is rejected, the input / output request interface for notifying the application program that the management storage area cannot be used is provided.

The invention according to claim 2 is the input / output system according to claim 1, wherein the generation management guard means inputs / outputs from an arbitrary application program while the input / output system is stopped. It is characterized in that a function of rejecting an input / output request from the application program is added when there is a request.

The invention according to claim 3 is the input / output system according to claim 1 or 2, wherein the generation information is:
It is characterized in that it comprises start time data of the input / output system.

The invention according to claim 4 is the input / output system according to claim 3, characterized in that the start time is displayed up to microseconds.

[0011]

In the configuration of the present invention, the generation information storage means stores the generation information of the input / output system. This generation information is updated by the generation management update means each time the input / output system is activated. The start / stop request interface acquires the management storage area when the input / output system is started, and releases the management storage area when the input / output system is stopped. The generation management guard means refers to the generation information stored in the generation information storage means at the time of the input / output request of the application program, if the generation information copy exists in the management information of the application program. Then, by comparing the generation information with a copy of the generation information existing in the management information, it is determined whether or not the request is an input / output request to the management storage area after the restart. As a result of this determination, if the two do not match, it means that the generations are different (that is, the management storage area is not released between the two generations).
This application
The input / output request of the program 3 is rejected to prevent the risk of accessing a predetermined area of the management storage area which may be used by another application program now. On the other hand, if the two match, the access request is for the management storage area after the restart, so access to the management storage area is permitted.

Therefore, the input / output system can be stopped quickly and safely with the application program running. Therefore, for an application program that uses the I / O system only for the first time but does not use it thereafter, there is no fear of forced termination due to the stop of the I / O system, which makes the I / O system very convenient. . In addition, microseconds (μ
If the start time displayed up to sec) is adopted, the generation difference can be surely identified even if the stop / restart is performed within a minute time.

[0013]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing an electrical configuration of an input / output system in a computer system according to an embodiment of the present invention and a diagram for explaining the operation of the input / output system. The input / output system of this example is used for controlling data transfer between an external storage device (input / output device) and a main storage, and is used for recovery of input / output errors and SG.
Change parameters (enlarge / reduce the size of the management storage area)
It is similar to the conventional I / O system in that it does the above, but as will be described later, it becomes the generation of the I / O system in order to stop / restart the I / O system while the application program is running. Focusing on the concept, it is greatly different from the conventional input / output system in that it has an erroneous access prevention function by generation management.

The input / output system 1 of this example, as shown in FIG. 1, has a start / stop request interface program 2 for receiving a start / stop request from an input / output system manager MG, and an arbitrary application program 3. I / O request interface program 4 for receiving I / O requests from the I / O system, and a generation information operation information storage area (hereinafter simply referred to as generation information storage area) 5 for recording generation information 51 and operation information 52 of the input / output system 1. And a management storage area (buffer memory) 6 for temporarily storing various data 31 requested by the application program 3 for input / output. The input / output system manager (operator) MG is a person who maintains the state of the input / output system 1 correctly and provides a service to the user. Specifically, maintenance of the input / output system 1, change of SG parameters, The input / output system 1 is started / stopped for recovery from a failure or the like.

When the start / stop request interface program 2 receives a start request from the input / output system manager MG, the start / stop request interface program 2 acquires the management storage area 6 in the main memory. It is a resident program that releases the area 6, and the generation management update routine 21
have. The generation management update routine 21 updates the operation information 52 of the input / output system 1 stored in the generation information storage area 5 each time a start / stop request is received from the input / output system manager MG. When accepting the activation request, the process of updating the generation information 51 of the input / output system 1 stored in the generation information storage area 5 is also performed.

Here, the generation information 51 means that the input / output system 1 is stopped several times during the operation of the computer system.
When restarting is repeated, it is information indicating the generation (operating time) of the input / output system 1, and it is not necessary to recognize a specific generation (how many times it is started). Is sufficient to identify whether or not it is, for example, the start time displayed up to microseconds (μsec), the numerical information that is incremented each time it is started, etc.
It can be suitable generation information. The operation information 52 is
It is a flag indicating the operating state of the input / output system 1, that is, whether the input / output system 1 is operating or stopped.

Each application program 3 is assigned a data memory area for storing various data 31 and a management information memory area for storing management information 32 in the main memory, and the generation information is copied to this management information 32. 32a is included. Here, a copy of the generation information 32
“A” is a copy of the generation information 51 stored in the generation information storage area 5. At the time of copying, each application program 3 first makes an input / output request while the input / output system 1 is operating. It's time to go. Therefore, when the activation time displayed up to microseconds (μsec) is adopted as the generation information 51, a copy of this activation time becomes the generation information copy 32a. Therefore, copy of generation information 3
The contents of 2a include multiple application programs 3
If the input / output system 1 repeatedly stops / restarts during the operation of, the application program 3 that first issued the input / output request during the operation of this time and the first input / output request during the previous or previous two-time operation are performed. It is different from the application program 3 described above.

I / O request interface program 4
When an input / output request from any application program 3 is received, it judges whether or not the access is valid, and if it is determined to be valid, the input / output request received from the application program 3 is sent to the management storage area 6 On the other hand, if it is determined to be illegal (wrong), it is a resident program that notifies the application program 3 that the I / O system 1 cannot be used. It has a generation management guard routine 41 for determining whether or not. More specifically, the generation management guard routine 41 uses the operation information 5 from the generation information storage area 5 when an input / output request is made from any running application program 3.
2 to determine whether or not the input / output system 1 is currently in operation, and when it is in operation, refer to the generation information copy 32a from the management information 32 of the input / output request source (application program 3). On the other hand, referring to the generation information 51 from the generation information storage area 5, the two are compared and monitored for unauthorized access. Here, copy of generation information 3
If the start time of 2a does not match the start time of the generation information 51, it is determined as an unauthorized access. This is because the first input / output request of this application program 3 was made during the operation of the input / output system 1 before the restart, and in the management storage area 6 before the restart of this application program 3. This is because the allocated area of is already released and may be allocated to another application program 3 or removed from the management storage area 6.

The management storage area 6 is exchanged between a data memory area and a management information memory area assigned to the application program 3 and an external storage device 7 such as an optical disk device, an electronic disk device or a magnetic disk device. It is a storage area for temporarily storing the mutual data, and is acquired in the main memory when the input / output system 1 is started and released when the input / output system is stopped.

Next, the operation of this embodiment will be described. (1) Operation of Start / Stop Request Interface Program 2 First, the operation of the start / stop request interface program 2 will be described with reference to FIG. For example, the input / output system manager MG stops the input / output system 1 while the computer system is operating, changes SG parameters (enlarges or reduces the size of the management storage area 6), and then restarts the computer. Do the operation. This restart operation is
This is performed by issuing a start request for the input / output system 1 to the stop request interface program 2. The start / stop request interface program 2 receives the start request from the input / output system manager MG (#
1) First, the management storage area 6 is acquired in the main storage (#
2) Then, the acquired management storage area is initialized (# 3), and then the generation management update routine 21 is executed to generate the generation of the input / output system 1 stored in the generation information storage area 5. Update the information 51 and the operation information 52 (#
4). The generation information 51 is updated, for example, by rewriting the previous activation time with the current activation time, and the operation information 52 is updated by rewriting the "stopped state" into the "operating state" (set a flag). It is done by that.
When the update process of the generation management update routine 21 is completed, the start / stop request interface program 2 ends the start process. After that, the operation of the input / output system 1 is started (# 5).

The input / output system manager MG instructs the start / stop request interface program 2 of the input / output system 1 when the SG parameter needs to be changed again during the operation of the computer system. Make a stop request. Start / stop request interface program 2
When the stop request is received from the input / output system manager MG (# 6), the generation management update routine 21 is executed, and the contents of the operation information 52 of the input / output system 1 stored in the generation information storage area 5 are stored. Rewrite ("operating state") to "stop state" (clear the flag) (# 7). When the update process of the generation management update routine 21 is completed, the start / stop request interface program 2 performs the release process of the management storage area 6 without waiting for the end of the currently running application program 3 (# 8 ), The stop processing is ended. After that, the operation of the input / output system 1 is stopped (# 9).

(2) Operation of Input / Output Request Interface Program 4 Next, the operation of the input / output request interface program 4 will be described with reference to FIG. The arbitrary application program 3 in operation issues an input / output request to the input / output system 1 when exchanging data with the external storage device 7. When the input / output request interface program 4 receives the input / output request from the application program 3 (SP1), it executes the generation management guard routine 41 to perform the following processing. First, the operation information 52 is referenced from the generation information storage area 5 (SP2), and it is determined whether the input / output system 1 is in operation (SP3). As a result of this judgment, when the input / output system 1 is in the stopped state, the input / output request of the application program 3 is rejected. When the generation management guard routine 41 rejects the input / output request of the application program 3, the input / output request interface program 4 notifies the application program 3 that the input / output system 1 is unavailable ( SP4), and terminates the input / output processing. Therefore,
The application program notified of the unavailability cannot use the input / output system 1 until it is terminated, waits for the input / output system 1 to be restarted, and restarts itself.

On the other hand, when the input / output system 1 is in the operating state (SP3), the generation management guard routine 41
The generation information copy 32a is made by referring to the management information 32 of the input / output request source (application program 3) (SP5).
Check whether or not exists (SP6). As a result, when the generation information copy 32a does not exist in the management information 32 (in the case of "No" in SP6), this application
Since this is the first input / output request for the program 3, the generation information 51 is referenced from the generation information storage area 5 to create a copy (generation information copy 32a),
Copy the created copy of generation information 32a to this application
After adding it to the management information 32 of the program 3 (SP7),
The input / output request of this application program 3 is permitted. I / O request interface program 4
When the generation management guard routine 41 permits the input / output request of the application program 3,
Input / output (access) is performed according to the input / output request of the application program 3 (SP8), the execution result is notified to the application program 3, and then the input / output processing is ended.

On the other hand, when the generation information copy 32a is present in the management information 32 (in the case of "Yes" in SP6), the generation management guard routine 41 determines that the generation information storage area 5 to the generation information 51. Is read (SP9) and compared with the generation information copy 32a of the management information 32 (SP1).
0). As a result of this comparison, generation information 51 and generation information copy 3
If 2a does not match, the I / O system 1 that is currently operating and the I / O system 1 that was operating when this application program 3 first made an I / O request
In and, since the generations are different (that is, since the management storage area 6 has been released / acquired between the generations), the input / output request of the application program 3 is rejected. When the generation management guard routine 41 rejects the input / output request of the application program 3, the input / output request interface program 4 causes the application program 3 to input / output the system 1
After notifying that it is not available (SP4), the input / output processing is terminated. Therefore, the application program notified of the unavailability cannot use the input / output system 1 until it is terminated and restarted.

On the other hand, the generation management guard routine 41
When it is determined that the generation information 51 and the generation information copy 32a match, the input / output system 1 that is currently operating and the input / output system that was operating when this application program 3 first made an input / output request. 1 and the same generation (that is, since the management storage area 6 has not been released / acquired between the current I / O request and the first I / O request), the application program 3
I / O requests are permitted. I / O request interface
When the generation management guard routine 41 permits the input / output request of the application program 3, the program 4 receives the application program 3
Input / output (access) according to the input / output request of
P8), after notifying the application program 3 of the execution result, the input / output processing is ended.

As described above, according to the configuration of this example, when the input / output request of the application program 3 is received, it is determined whether or not the input / output request is for the management storage area 6 after the restart. As a result of this determination, when the input / output request is for the management storage area 6 before the restart, the access to the management storage area 6 is denied, so that an erroneous access can be prevented. Therefore, the application
The input / output system 1 can be stopped immediately and safely while the program 3 is running, and the SG parameter can be changed quickly, for example. Therefore, for the application program 3 that uses the input / output system 1 only for the first time but does not use it thereafter, there is no fear of forced termination due to the stop of the input / output system 1. It becomes system 1. Further, if the activation time that is displayed up to microseconds (μsec) is adopted as the generation information 51, it is possible to reliably identify the generation difference even when the stop / restart is performed within a minute time.

The embodiment of the present invention has been described in detail above with reference to the drawings. However, the specific structure is not limited to this embodiment, and there are design changes and the like within the scope not departing from the gist of the present invention. Also included in the present invention. For example, the generation information is not limited to the activation time displayed up to microseconds (μsec), the numerical information incremented each time it is activated, and the like. In short, the first I / O request of any application program is after the restart (after this start)
If it is data that indicates whether it has been performed before, or before rebooting (before this time), it can be used as generation information.

[0028]

As described above, according to the input / output system of the present invention, when an input / output request from an application program is accepted, whether or not the input / output request is for the management storage area after restarting. If the input / output request is for the management storage area after the restart, the access is permitted to the management storage area, but if the input / output request is for the management storage area before the restart Refuses access to the management storage area because it may access a predetermined area of the management storage area that may be used by another application program. Therefore, the input / output system can be stopped / started safely and quickly while the application program is running. Therefore, for an application program that uses the I / O system only for the first time but does not use it thereafter, there is no fear of forced termination due to the stop of the I / O system, which makes the I / O system very convenient. .

[0027]

[Brief description of drawings]

FIG. 1 is a block diagram showing an electrical configuration of an input / output system in a computer system according to an embodiment of the present invention, and a diagram for explaining the operation of the input / output system.

FIG. 2 is a diagram for explaining the operation of the embodiment, and more specifically, a flowchart for explaining the operation of a start / stop request interface program (generation management update routine).

FIG. 3 is a diagram for explaining the operation of the embodiment, and more specifically, a flowchart for explaining the operation of the input / output request interface program (generation management guard routine).

[Explanation of symbols]

1 Input / output system 2 Start / stop request interface program (start / stop request interface) 21 Generation management update routine (generation management update means) 3 Application program 32 Management information 32a Generation information copy 4 Input / output request interface program (input Output request interface) 41 generation management guard routine (generation management guard means) 5 generation information storage area (operation information storage means, generation information storage means) 51 generation information 52 operation information 6 management storage area 7 external storage device

Claims (4)

[Claims] 1. An input / output system capable of stopping / starting itself during the operation of a computer system, operation information storage means for storing operation information indicating whether or not the input / output system is in an operating state. A generation information storage means for storing generation information of the input / output system, and a generation management update means for updating the generation information stored in the generation information storage means each time the input / output system is activated, A start / stop request interface that acquires the management storage area when the input / output system is started, and releases the management storage area when the input / output system is stopped, and input / output from any application program while the input / output system is operating When there is a request, if the generation information copy does not exist in the management information of the application program, the input / output system The generation information copy systems out after applying to the management information application
If the input / output request from the program is permitted and the generation information copy that matches the generation information stored in the generation information storage means exists in the management information of the application program, the input / output request from the application program If there is a copy of generation information that does not match the generation information stored in the generation information storage means in the management information of the application program, generation management that rejects the input / output request from the application program Guard means and the generation management guard means
When the input / output request from the program is permitted, the management storage area is accessed according to the input / output request of the application program, and the result is sent to the application / application.
While notifying the program, an I / O request interface for notifying the application program that the management storage area is unavailable when the generation management guard unit rejects the I / O request from the application program An input / output system in a computer system characterized by: 2. The generation management guard means rejects an input / output request from an application program when an input / output request is made from any application program while the input / output system is stopped. The input / output system in a computer system according to claim 1, wherein a function is added. 3. The input / output system according to claim 1, wherein the generation information includes start time data of the input / output system. 4. The input / output system according to claim 3, wherein the start time is displayed up to microseconds.