JPH083800B2 - File area management information restoration device - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a file area management information restoration device, and more particularly to area management information for managing the usage and unused status of a file area in a file. When there is user information including area usage information, an area that is not used by anyone in the area management information is in use due to a system failure, etc. The present invention relates to an in-file area management information restoration device that restores area management information during simultaneous file access.

[Conventional technology]

Conventionally, when waste occurs in the file area managed by the area management information in the file, in order to save waste,
It has been necessary to occupy the file and recreate the file, or to recreate only the area management information based on the usage information of the area included in the user information in the file.

For example, in the case where a file has area management information that manages the used and unused states of the area in the file and a plurality of user information including the usage information of the area in the file, when the area is secured, the Both the area management information and the user information in the data file are updated, but if the area management information is updated due to a system failure and the user information is not updated, no one is using it. Area is in use. In this way, when a file area that is not used by anyone in the area management information is in use due to a system failure or the like, and a file area is wasted, a file re-creation job is executed or a file area is wasted. It was necessary to execute a job for the release processing.

[Problems to be Solved by the Invention]

In the above-mentioned conventional internal file area management device, since the simultaneous access control of the file is not performed, it is necessary to wait for the completion of the execution of other simultaneous access jobs sharing the file before the file re-creation job is executed. Or
There is a drawback that it is not possible to execute a job for useless file area release processing.

In view of the above points, an object of the present invention is to execute a job (repair program) for releasing useless file area even when another simultaneous access job (input / output program) sharing a file is being executed. An object is to provide an in-file area management information restoration device that is made possible.

[Means for Solving the Problems] An in-file area management information restoration device of the present invention includes area management information for managing the usage and unused states of areas in a file and usage information of areas in the file. A data file having user information, an area management information file having an area capable of storing only area management information of the data file, and an input / output processing means including an input / output program for requesting input / output to the data file,
Repair processing means including a repair program for requesting repair of area management information of the data file, simultaneous access control means for exclusive control of the area management information of the data file, and input / output request from the input / output processing means When the area in the data file becomes necessary or unnecessary, the area management information of the data file is exclusively controlled through the simultaneous access control means to secure or release the area of the data file and refer to the simultaneous access control means. Then, if the restoration program is running, the area control information file is assigned to the input / output program to set the area management information of the corresponding area of the area management information file to the used or unused state. File access means including the area, and the area when the repair request is issued from the repair processing means. A logical information file, notifies the simultaneous access control means that the restoration program is being executed, and uses the data file while controlling the area management information of the data file exclusively through the simultaneous access control means. After reflecting the usage information of the area in the user information to the area management information of the area management information file,
Area management that copies the area management information of the area management information file to the area management information of the data file, notifies the simultaneous access control unit that the restoration program has finished executing, and deletes the area management information file And information recovery means.

[Action]

In the in-file area management information restoration device of the present invention, the data file has in the file area management information for managing the usage and unused state of the area in the file and user information including the usage information of the area in the file. The area management information file has an area that can store only the area management information of the data file. The input / output processing means including the input / output program requests input / output to / from the data file, the repair processing means including the repair program requests repair of the area management information of the data file, and the simultaneous access control means includes the area management information of the data file. Exclusive control of. When the area control means in the file access means makes an area in the data file necessary or unnecessary at the time of an input / output request from the input / output processing means, the area control information of the data file is exclusively controlled through the simultaneous access control means to perform data control. If the recovery program is executing by securing or releasing the file area and referring to the simultaneous access control means, allocate the area management information file to the input / output program and use the area management information of the corresponding area of the area management information file. Or the unused state, the area management information restoration means creates the area management information file at the time of a restoration request from the restoration processing means, notifies the simultaneous access control means that the restoration program is being executed, and simultaneously accesses Users in the data file while exclusively controlling the area management information of the data file through the control means After the usage information of the area in the report is reflected in the area management information of the area management information file, the area management information of the area management information file is copied to the area management information of the data file, and the recovery program is executed by the simultaneous access control means. Notify that the process is complete and delete the area management information file.

〔Example〕

Next, the present invention will be described in detail with reference to the drawings.

FIG. 1 is a block diagram showing an internal file area management information restoration device according to an embodiment of the present invention. The in-file area management information restoration device of the present embodiment has an input / output program 1 for requesting input / output to / from a data file 8, a file access means 2 for performing input / output processing according to the request of the input / output program 1, and a file access means 2. Area control means 3 existing in the file access means 2 for controlling securing and releasing of the area in the data file 8, file close means 4 also existing in the file access means 2 for performing file close processing of the data file 8, and data file 8 Repair program 5 requesting repair of the area management information 10 in the area, and area management information in the data file 8 according to the request of the repair program 5.
The area management information restoration means 6 for performing the restoration processing of 10, the simultaneous access control means 7 for controlling the simultaneous access of the area management information 10 in the data file 8, and the used and unused states of the areas in the file Area management information to manage
A data file 8 having 10 and user information 11 including usage information of areas in the file, and an area management information file 9 for storing area management information restored from the user information 11 in the data file 8. It consists of

Referring to FIG. 2, the processing for securing an unused area in the data file 8 of the area control means 3 is the area management information exclusive control step 21, the data file unused area search step 22, and the availability judgment. Step 23, data file expansion and initialization step 24, data file area securing step 25, data file area securing step 26, repair program running determination step 27, area management information file allocated determination step 28, It includes an area management information file allocation step 29, an area management information repaired determination step 30, an area management information in-use setting step 31, and an area management information exclusive control release step 32.

Referring to FIG. 3, the processing of the file closing means 4 includes a data file closing processing step 41, an area management information file allocation completion determination step 42, and an area management information file deallocating step 43.

Referring to FIG. 4, the process of the area management information restoration means 6 is performed by the area management information file creation and initialization step 61.
A repair program execution notification step 62, a user information search step 63, a user information all search completion determination step 64, an area usage information extraction step 65, an area management information exclusive control step 66, and area management information In-use setting step 67, area management information exclusive control release step 68,
Area management information exclusive control step 69, area management information copying step 70, area management information restored setting step 71
The area management information exclusive control releasing step 72, the area management information all copying determination step 73, the repair program execution end notifying step 74, and the area management information file allocation releasing and deleting step 75.

Next, the operation of the in-file area management information restoration device of this embodiment configured as described above will be described.

(1) Area Reserving Process When an input / output request is issued from the input / output program 1, the file access means 2 performs an input / output process on the data file 8. At this time, if an unused area in the data file 8 becomes necessary, the file access means 2
Requests the area control means 3 to secure an unused area in the data file 8.

Upon receiving the unused area securing request from the file access means 2, the area control means 3 exclusively controls the area management information 10 in the data file 8 through the simultaneous access control means 7 (step 21), and the area management information 10 Is checked to see if there is an unused area in the data file 8 (step 22).

When there is no unused area in the data file 8 (step 23), the area control means 3 extends the file area of the data file 8 and adds the area management information of the unused area, which has been expanded, to the area management information 10. Then, the unused area is secured based on the added area management information 10 and the area management information 10 of the relevant area (area secured in the data file 8) is set to be in use (step 25). ), The exclusive control of the area management information 10 is released through the simultaneous access control means 7 (step 32), and the control is returned to the file access means 2.

When there is an unused area in the data file 8 (step 23), the area control means 3 secures the unused area based on the area management information 10 and the area management information of the corresponding area.
10 is set to be in use (step 26), and it is checked whether the simultaneous access control means 7 has been notified that the restoration program 5 is being executed (see step 62) but has been notified of the end of execution (see step 74). Thus, it is determined whether the repair program 5 is being executed (step 27).

If the restoration program 5 is not running (Step 2
7) The area control means 3 releases the exclusive control of the area management information 10 through the simultaneous access control means 7 (step 3
2) Return control to the file access means 2.

If the restoration program 5 is running (step 27),
The area control means 3 determines whether or not the area management information file 9 created by the area management information restoration means 6 is assigned to the input / output program 1 (step 28). The area management information file 9 is assigned to the program 1 (step 29). Steps 28 and 29 are processing for allocating the area management information file 9 created by the area management information restoration means 6 to the input / output program 1 only once at the first time to enable input / output.

Next, the area control unit 3 determines whether the area management information of the corresponding area of the area management information file 9 indicates that the area management information has been restored (the area management information of the corresponding area of the area management information file 9 is the area management information of the data file 8). It is determined whether or not it has been copied to 10) (step 30).

When the area management information of the corresponding area of the area management information file 9 indicates that the area has been repaired (step 30), the area control means 3 reflects the fact that the area has been secured in the area management information of the area management information file 9. Since it is not necessary to do so, the exclusive control of the area management information 10 is released through the simultaneous access control means 7 (step 32), and the control is returned to the file access means 2.

If the area management information of the corresponding area of the area management information file 9 does not indicate that the area has been repaired (step 30), the area control means 3 sets the area management information of the corresponding area of the area management information file 9 to "in use". (Step 31), the exclusive control of the area management information 10 is released through the simultaneous access control means 7 (step 32), and the control is returned to the file access means 2. Although it seems that writing from the area management information restoration means 6 (step 67 or 71) may conflict during writing to the area management information file 9 in step 31, step 21 before step 31 The area control information 10 is always exclusively controlled, and the step 61 or 71 is performed.
Since the exclusive control of the area management information 10 is also performed in the step 66 or 69 before the step, the area management information restoration means 6 causes the area management information restoration step 6 to execute the step 67 or 71 during the processing of the step 31.
Is not processed (at least the area management information restoration means 6 is kept waiting in step 66 or 69), and there is no conflict in writing to the area management information file 9.

(2) Area release processing Although not described in detail, when the file access means 2 needs to release the used area in the data file 8 when performing input / output processing with respect to the data file 8. However, in the same manner, the area control means 3 is called to release the used area in the data file 8. Also at this time, it is judged whether or not the area management information of the corresponding area (the released area in the data file 8) of the area management information file 9 indicates that the area has been repaired. The area management information of the corresponding area of the information file 9 is set to the unused state.

(3) File close processing When there is a file close request for the data file 8 from the input / output program 1, the file access means 2
A file close process for the data file 8 is requested of the file close means 4.

Upon receiving the file close processing request from the file access means 2, the file close means 4 performs the file close processing of the data file 8 (step 41),
When the area management information file 9 is allocated to the input / output program 1 (step 42), the allocation of the area management information file 9 to the input / output program 1 is released (step 43).

(4) Area Management Information Restoration Processing The restoration program 5 is activated when an event in which a useless area is likely to occur in the data file 8 occurs or periodically. Then, the area management information from the restoration program 5
When there is a request for restoration of 10, the area management information restoration means 6 creates an area management information file 9 having an area in which the area management information 10 of the data file 8 can be stored, and allocates it to the restoration program 5 to create the area management information file 9. Data file 8
Area is initialized so as to indicate that all areas are unused (step 61), and the simultaneous access control means 7 is notified that the restoration program 5 is being executed (step 6).
2).

Next, the area management information restoration means 6 uses the data file 8
The user information 11 in the user information 11 is searched (step 63), and it is determined whether the search of all the user information 11 is completed (step 63).
64), if all the user information 11 has not been searched, the use information of the area of the user information 11 is taken out from the data file 8 (step 65). Subsequently, the area management information restoration means 6 causes the area management information 10 through the simultaneous access control means 7.
Is exclusively controlled (step 66), and the area management information of the corresponding area of the area management information file 9 is set to "in use" based on the area usage information held by the user information 11 (step 67).
Although it seems that writing from the area control means 3 (step 31) may conflict during writing to the area management information file 9 in step 67, the area management must always be performed in step 66 before step 67. Since the exclusive control of the information 10 is performed, and the exclusive control of the area management information 10 is also performed in step 21 before step 31, the area control information restoration means 6 causes the area control means 3 to execute during the processing of step 67. The step 31 is not processed (at least the area control means 3 is kept waiting in the step 21), and the area management information file 9
There is no conflict in writing to. Next, the area management information restoration means 6 releases the exclusive control of the area management information 10 through the simultaneous access control means 7 (step 68), and the step
Return to 63.

When all user information 11 has been searched (Step 6
4), the area management information restoration means 6 exclusively controls the area management information 10 through the simultaneous access control means 7 (step 6
9), the area management information of the area management information file 9 is sequentially copied to the area management information 10 of the data file 8 (step 7
0), repaired is set in the area management information of the corresponding area of the area management information file 9 (step 71). Although it seems that writing from the area control means 3 (step 31) may conflict during writing to the area management information file 9 in step 71, step 69 before step 71.
Since the area management information 10 is always exclusively controlled, and the area management information 10 is also exclusively controlled at step 21 before step 31, the area management information restoration means 6 performs the area control during the processing of step 71. The control means 3 does not process step 31 (at least the area control means 3
There is no conflict in writing to the area management information file 9). Next, the area management information restoration means 6
Releases the exclusive control of the area management information 10 through the simultaneous access control means 7 (step 68) and returns to step 63.
Next, the area management information restoration means 6 releases the exclusive control of the area management information 10 through the simultaneous access control means 7 (step 72), and manages the area of the data file 8 of all the area management information of the area management information file 9. It is judged whether or not the copying to the information 10 is completed (step 73), and if the copying is not completed, the procedure returns to step 69.

When the copying of all the area management information of the area management information file 9 to the area management information 10 of the data file 8 is completed (step 73), the area management information restoration means 6 indicates the end of execution of the restoration program 5 by the simultaneous access control means. 7 is notified (step 74), the allocation of the area management information file 9 to the repair program 5 is released, and the area management information file 9 itself is deleted (step 75).

In the above embodiment, the case where the number of the input / output programs 1 is 1 has been described as an example. However, even when the number of the input / output programs 1 is plural, the contention control of the input / output requests from the input / output programs 1 is performed inside the file access means 2. It goes without saying that the present invention can be similarly applied by carrying out the above.

〔The invention's effect〕

As described above, according to the present invention, in the case where the file has the area management information for managing the used and unused states of the area in the file and the user information including the usage information of the area in the file, the file access means An area control means is provided in the area, and while simultaneously controlling the area management information of the data file by the simultaneous access control means, the area of the data file is secured, the area management information file is allocated, and the area management information file is written. By providing the management information restoration means to create and delete the area management information file and to perform the exclusive control of the area management information of the data file by the simultaneous access control means while writing to the area management information file,
When a file area that is not used by anyone in the area management information is being used due to a system failure or the like, and the file area is wasted, one or more other simultaneous access jobs (I / O program) that share the data file Even when (1) is being executed, there is an effect that a job (restoration program) for useless file area release processing can be executed.

[Brief description of drawings]

FIG. 1 is a block diagram showing an in-file area management information restoration device of an embodiment of the present invention, FIG. 2 is a flow chart showing an area securing process from a data file in an area control means in FIG. 1, FIG. FIG. 4 is a flow chart showing a data file closing process by the file closing means in FIG. 1, and FIG. 4 is a flow chart showing a region file management information restoration process of the data file by the region management information restoration means in FIG. In the figure, 1 ... I / O program, 2 ... File access means, 3 ... Area control means, 4 ... File closing means, 5 ... Restoration program, 6 ... Area management information restoration means, 7 ... Simultaneous Access control means, 8 ... Data file, 9 ... Area management information file, 10 ... Area management information, 11 ... User information.

Claims (1)

[Claims] 1. A data file having area management information for managing the use and unused states of areas in the file and user information including usage information of areas in the file, and area management of the data file. An area management information file having an area capable of storing only information, an input / output processing unit including an input / output program requesting input / output to the data file, and a repair program requesting repair of area management information of the data file Repair processing means, simultaneous access control means for performing exclusive control of the area management information of the data file, and when the area in the data file becomes necessary or unnecessary at the time of an input / output request from the input / output processing means, The data file area is controlled while the area management information of the data file is exclusively controlled through the simultaneous access control means. Area of the area management information file is allocated to the input / output program by allocating or releasing a file area and referring to the simultaneous access control means and the restoration program is being executed. File access means including area control means for setting information to a used or unused state, and the area management information file is created at the time of a repair request from the repair processing means, and the repair program is executed by the simultaneous access control means. That the area management information of the area management information file is used while the area management information of the area of the user information in the data file is exclusively controlled by the simultaneous access control means. Area management information of the area management information file, Area management information restoration means for copying the area management information, notifying the simultaneous access control means that the restoration program has finished executing, and deleting the area management information file; Area management information restoration device.