JPH02214925A - File control system - Google Patents

Abstract

PURPOSE:To reduce the changed variable and simultaneously to facilitate the control of files over several generations by producing only a control table to the changed data and executing DRAW together with the changed data. CONSTITUTION:In a file writing state, a control table A relating to the corresponding file is written. Then a control table B which controls the changed data only is produced and written together with the changed data in a DRAW state. In a file reading state, the table A is read out on a main memory device and an initial file is read out with the table A. Then the tables B equivalent to the DRAWs of the necessary generations are selectively read out, and the changed files of the necessary generations are read out based on the tables B read selectively. The changed files are superscribed on the initial file for the production of the file of the corresponding generation. Thus the corrections are freely carried out with a small corrected variable. Furthermore a specific generation is designated and read out even in the case the corrections are given to several generations.

Description

[Detailed Description of the Invention] [Summary] File control port method for write-once auxiliary storage device When there is a modification item in a file on the write-once auxiliary storage device, it can be modified as many times as necessary with a small amount of modification. The purpose is to provide a file control method that allows specifying and reading a specific generation even when modifications have been made over multiple generations. (1) Writing files in a write-once auxiliary storage device Sometimes, the first control information regarding the file is written, and when the file is changed, the second control information that has been changed only for the changed part of the file is added, and when reading, the first control information is written. Read out the control information, selectively read out the second control information for additional writing, or read out the first control information that has been read out,
The control information generated by updating with the contents of the second control information read above is used to obtain a file of an arbitrary version number. (2) In the above file control method,
When a specific file on the write-once auxiliary storage device is modified, the second control information is written to a non-write-once file storage device, and the write-once auxiliary storage device and the file storage device are Configure it so that it can be used to temporarily modify files.

[Industrial Application Field] The present invention relates to a file control method for a write-once auxiliary storage device.

The amount of data processed by modern computer systems is increasing,
In addition, due to the demand for improved reliability of computer systems, write-once auxiliary storage devices such as optical disk devices have come into use. Service processor (
SVP), etc.

However, since the write-once type auxiliary storage device has the characteristic that it cannot be rewritten, an effective file control method that matches this characteristic is required.

(Prior art and problems to be solved by the invention) FIG. 2 is a diagram explaining a conventional file control method for a write-once storage device, in which (a) shows an example of a system configuration, and (b)
) indicates the relationship between the file and the control table (8), and (
(c) shows an example of the control table (A), and (d) shows the processing flow at system startup.

(a) The system shown in U4 represents, for example, a service processor (SVP) that performs maintenance and diagnosis of the main unit of the computer system, and as shown in the figure, stores and maintains system files, etc. However, a write-once auxiliary storage device 3 such as an optical disk device is used.

In the write-once type auxiliary storage device 3, as shown in FIG.
When writing 101 to 105, write the control table (A) 200 (・100) with the configuration shown in Figures (b) and (C), and when reading at the time of initial program loading (IPL) etc., the necessary version is written. Number control table (A)
200, necessary files are read out. (See figure (d)) As mentioned above, the write-once auxiliary storage device 3 cannot be rewritten, so if there is a change in the created file, a new version of the latest version is created as a whole. Then, in the area that has already been written,
For example, from the following area, the control table (A) 200 (=100) shown in figures (b) and (c) above,
There was no way to add file 101~ to each file.

Therefore, when a file is stored in the write-once auxiliary storage device 3, if the file is modified, there is a problem that the amount of modification becomes large (and it becomes difficult to manage multiple generations of files). Ta.

In view of the above-mentioned conventional drawbacks, the present invention provides a file control method for a write-once auxiliary storage device, in which when there is a modification item in a file on the write-once auxiliary storage device, the amount of modification is small and the modification can be made as many times as necessary. The object of the present invention is to provide a file control method that allows for the specification and reading of a specific generation even when modifications have been made over multiple generations.

[Means for Solving the Problems] The above problems are solved by a file control method configured as follows.

(1) In a write-once auxiliary storage device, when writing a file, first control information regarding the file is written, and when changing the file, second control information is changed only for the changed part of the file. is additionally written, and at the time of reading, the above-mentioned first control information is read out, or the above-mentioned additionally added second control information is selectively read out, or the above-mentioned read out first control information is
The control information generated by updating with the contents of the second control information read above is used to obtain a file of an arbitrary version number.

(2) In the above file control method, if a specific file on the write-once auxiliary storage device is modified, the second control information is written to a file storage device that is not a write-once type, and The configuration is such that temporary file correction is performed using an auxiliary storage device and the file storage device.

[Effect]

That is, according to the present invention, in a non-rewritable write-once auxiliary storage device, when writing a file, a control table (^) related to the file is written, and when writing additionally, only the changed portion (changed data) of the file is written. Control information for managing the control table (B) is generated as a control table (B) and written together with the change data, and when reading, the first control table (A) is read to a specific area on the main storage device 0'Is) and the control information is After reading the initial files 1 to 1 using the table (A), the control table (B) for the additional writing of the required generation is selectively read to a specific area on the main storage device (MS). , based on the read control table (B), changes in the file of the required generation are read out and overwritten on the initial file to generate the file of the generation.

Furthermore, if the change is, for example, temporary, writing the control table (B) to the write-once auxiliary storage will result in a loss of space in the write-once auxiliary storage. By writing the control table (B) and the change data to a rewritable normal file storage device, such as a floppy disk device, temporary file modification is realized using the write-once auxiliary storage device and the floppy disk device. do.

By performing file control on the write-once auxiliary storage device in this way, when a file is changed, the control information (control table (B)) regarding the changed location is only the changed data, so the amount of changes is small and the file is This makes it easier to manage multiple generations, and has the effect that files of a specific version can be read out simply by specifying a change control table (control table (B)) for a specific version.

〔Example〕

Embodiments of the present invention will be described in detail below with reference to the drawings.

FIG. 1 is a diagram showing an embodiment of the present invention, (a)
, (bl), (b2) show an example of the configuration of the control table (B) for change data of the present invention, (c) shows an example of the file structure on the write-once auxiliary storage device, and (d)
) is the main storage device (MS) for each control information etc. at the time of reading.
) shows an example of the above allocation, and (e) shows the processing flow at the time of initial program loading (IPL), in which the control table f control table (
B)) is created and added along with the changed data (
The means are the means necessary to carry out the invention. Note that the same reference numerals indicate the same objects throughout the figures.

The file control method of the present invention will be explained below with reference to FIG.

In this embodiment as well, for convenience of explanation, a service processor (SVP) is used as an example.

In the present invention, when changing a file, (a)
A control table (B) 300 shown in the figure is created.

In this control table (B) 300, the file number, file name, start address, size, version number 9 creation date and time, etc. are generated in the fixed data description section in the same format as when the file was first generated. , and a change table 1 address and a change table 2 address regarding the change data are generated in the change data description section.

The above change table 1 address is the change table 1 shown in figure (bl)
500, and is used when the amount of change is small.

In the change table 1500, as shown,
By configuring the changed data as a pair and the relative address within each module (file) where the changed data should be overwritten, when the amount of changes to a file is small, the change can be made by simply accessing the changed amount 1500. Able to recognize data and change position.

Next, the change amount 2 address is the change amount 2 shown in the (b2) diagram.
600, and is used when the amount of changes is large.

In the change amount 2600, as shown in the figure,
By configuring the relative address in the module (file), the size of the changed data, and the changed data address in the optical disk as a pair, the changed data and its changed position can be determined regardless of the amount of change. This makes it possible to recognize the following.

In the present invention, a control table (B) 300 for only the above change data. Change amount 1500. Change amount 260
0. Control table (A) in which the change data group 700 was generated at the time of file creation 10 Sail module (file)
Following the groups 101 to 105, additional information is added, for example, in the configuration shown in FIG.

The control table (B) 300 etc. for the changed data is added sequentially for each version corresponding to each file (101 to 105), so the updated data and its control information can be searched in order. By doing so, control information and update data of any generation can be read.

When reading the file data filed in this way, the following procedure is used to read it. (See figures (d) and (e)) ■ The service processor (SVP) shown in Figure 2 (a)
)'s central processing unit (MPU) I is the main memory (MS)
) 2, when the module load processing program (hereinafter referred to as load processing section) stored in a specific area is executed, the module load processing program (hereinafter referred to as load processing section) stored in a specific area of control table (
A) 100 (-200) in the main storage device (MS)
2 into area 401.

■ The load processing unit loads the control table (A), 20
0, individual files 101 to 105 are read into areas 402 to 406 on main memory (MS) 2.

(2) Then, the rotary processing unit reads the control table (B) 300 created at the time of the first revision from the optical disk device 3 into the area 407 of the main storage device (MS) 2.

■ Next, the central processing unit (MPU) 1 executes the system creation processing program (hereinafter referred to as the system creation processing section) stored in a specific area of the main storage device (?IS) 2. However, if the command to obtain the latest version of the system file is made from the controller 7 (see Figure 2 (a)), the main storage device (MS) 2
Control table (B) stored in the upper area 407
300 is moved to area 408 and is set as the latest version of the control table.

■ In the process of (■) above, the system creation processing unit performs the following steps:
If the instruction from the console 7 specifies to obtain the first version of the system file, the first version of the control table (A) 200 stored in the area 401 on the main storage device (MS) 2 is retrieved. Move to area 408,
Use this as a control table for reading files.

■Next, the central processing unit (→pH) 1 executes the system creation processing section to create the first edition or any number of editions (in this example, based on the control table 408).
1st edition) can be created by overwriting the initial file created in step ① above with the changed data. (See step 11.12 in the diagram (e)) In this way, the service processor (SVP) can be started up with any version of the system file.

By executing the system file, the service processor (SVP) sends information to each device (not shown) in the main system.
For example, it performs processing such as loading microprograms,
The startup of the computer system is completed. (See step 13 in the diagram (e)) In the above embodiment, the changed data and the control table (B) 30 for the changed data
0 etc. is added to the optical disk device 3, but if the change is temporary, the optical disk device 3
Direct additional writing to the optical disk device 3 will result in a loss of area on the optical disk device 3. Therefore, if a rewritable file storage device, for example, the floppy disk device 6 shown in FIG. Figure 1 (a), (bl),
Control information 300, 500, 600 shown in (b2),
And, when writing the change data group 700 and creating a system file of an arbitrary version, the optical disk device 3
Based on the first version of the file stored in the floppy disk device 6, the changed data stored in the floppy disk device 6, and its control information, the necessary control table is stored in the area 408 on the main storage device (MS) 2. By creating an arbitrary version of the system file based on the created control table, temporary correction can be realized.

It should be noted that the configuration examples of the control information 300.500.600 shown in FIGS. It goes without saying that this is possible.

In addition, in the above embodiment, in order to create the first version or the modified version of the system file, the control table (A) 200 of the first version is read into the area 401 on the main storage device (MS) 2, and the control table is (A) Based on 200,
Files (101-105) of the first edition are stored in area 402-
Control table at the time of revision after generation in 406 (B) 3
00 is read into area 407 on main memory (MS) 2, and area 401. Alternatively, although the example of obtaining a file of any version number based on the control table (A) in the area 407 or the control information obtained by moving the control table (B) to the area 408 has been described, the method is not limited to this method. Control table (A) 2 that is read out to area 401
00, it goes without saying that the control information at the time of revision may be generated by directly updating the contents of the control table (B).

As described above, the present invention enables file management in a write-once auxiliary storage device that cannot be rewritten, such as an optical disk device, to first create a control table (8) at the time of file creation and write it together with the pig. , when there is a change in the written file, only the control table (B) for the changed data is created and added, but if the change is temporary, only the control table (B) for the changed data is created and added. The feature is that by creating a file and storing it in a rewritable normal file storage device, such as a floppy disk device, it is possible to modify any version of the file or to modify the file temporarily. be.

〔Effect of the invention〕

As described above in detail, the file control method of the present invention performs file control on a write-once auxiliary storage device, and (1) when writing a file in the write-once auxiliary storage device, 1 control information is written, and when the file is changed, second control information that has been changed only for the changed part of the file is added, and when reading, the above first control information is read, or , using control information generated by selectively reading out the additionally added second control information, or updating the read out first control information with the contents of the read out second control information. , configure it to get files of any version number. (2) In the above file control method, if a specific file on the write-once auxiliary storage device is modified, the second control information is written to a file storage device that is not a write-once type, and Since the auxiliary storage device and the file storage device mentioned above are used to temporarily modify files, when a file is changed, only the data of the changed part is required, so the amount of changes is small, and the file This makes it easier to manage multiple generations of files, and it has the effect of allowing files of a specific version to be read out simply by specifying a specific control table.

[Brief explanation of the drawing]

FIG. 1 shows an embodiment of the present invention, and FIG. 2 is a diagram illustrating a conventional file control method for a write-once storage device. It is. In the drawing, 1 is the central processing unit (MPU), 2 is the main memory (MS)
3 is a write-once auxiliary storage device or an optical disk device. 6 is a floppy disk device. 7 is the console. 11 to 13 are processing steps. 100.200 is 匍H wholesale table (8). 101 to 105 are files. 401 to 408 are areas on the main memory (MS) 2. 300 is the control table (B), 500 is the change table 1, 600 is the change table 2. 700 each indicates a changed data group.

Claims (2)

[Claims] (1) In the write-once auxiliary storage device (1), when writing a file, first control information (
200), and when changing the file, add the changed second control information (300, 500, 700) only for the changed part of the file,
At the time of reading, either the first control information (200) is read out, or the second control information (300) is read out.
or the control information (408) generated by updating the first control information (401) read above with the contents of the second control information (407) read above.
) is used to obtain a file of any version number. (2) In the above file control method, if a specific file on the write-once auxiliary storage device (1) is modified, the second control information (300, 500, 700
) is written in a non-write-once file storage device (6), and the file is temporarily modified using the write-once auxiliary storage device (1) and the file storage device (6). control method.