JPH05257764A - Automatic file extension system - Google Patents

Abstract

PURPOSE:To provide the file extension system which can automatically extend a file when it is required. CONSTITUTION:At the time of allocating files, an extending amount designating means 12 respectively registers extending amounts in the case of extending files corresponding to respective file labels. A file extending means 13 extends the file having the relevant file label in the case of receiving the information of overflow generation. Corresponding to a write request from a program 15, an input/output managing means 14 writes data in the respective files and, when overflow is generated, the information of the overflow generation is transmitted to the file extending means 13. After the file is extended, data are written again.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a process for automatically expanding a standby join organization file in a host computer.

[0002]

2. Description of the Related Art Conventionally, the extension of a standby join organization file
The procedure was as follows. The data in the file to be processed is downloaded to another medium (such as a magnetic tape). Delete the file and reallocate it. Deletes the previously downloaded data from the newly allocated file.

[0003]

The conventional file extension process described above has the following problems. Accurate processing cannot be expected because human intervention is required during expansion processing. That is, there is a possibility that the data download process will fail and the file will be destroyed. The expansion process takes time. Therefore, during that time, the use of the corresponding file is restricted, which causes inconvenience to the user. If an overflow occurs during the writing process by the program, the program must be executed again after performing the file expansion process.

[0004]

The automatic file extension system according to the present invention receives an overflow occurrence notification and an extension amount designating means for registering the extension amount at the time of file extension corresponding to each file label. And a file expansion means for expanding the file of the corresponding file label, and data is written to each file according to a write request from the program, and when an overflow occurs, an overflow occurrence notification is transmitted to the file expansion means, and the file is expanded. And an input / output management means for rewriting the data.

[0005]

The expansion amount designating means registers the expansion amount at the time of file expansion at the time of file allocation, corresponding to each file label. Upon receiving the overflow occurrence notification, the file expansion means expands the file of the corresponding file label. The input / output management means writes data to each file in response to a write request from the program,
When an overflow occurs, an overflow occurrence notification is transmitted to the file extension means, and after the file is extended, the data is rewritten.

[0006]

Embodiments of the present invention will now be described with reference to the drawings. FIG. 1 is a block diagram showing an embodiment of the automatic file extension system of the present invention, and FIGS. 2 and 3 are flowcharts showing the operations of the file extension means and the input / output management means of the embodiment of FIG. 1, respectively.

When the file allocating means 11 allocates files, the expansion amount specifying means 12 specifies the expansion amount at the time of overflow for each file stored in the magnetic disk 10 in units of files. Store on existing file label. The file expansion unit 13 expands the file (for example, the file name “A”) based on the overflow notification and the file label. The input / output management means 14 writes data in response to a data write request from the program 15, and when an overflow occurs, notifies the file extension means 13 of the overflow.

Next, the operation of this embodiment will be described with reference to FIGS. In advance, when allocating files by the file allocating unit 11, the user specifies the expansion amount at the time of file overflow by the expansion amount specifying unit 12. The expansion amount designating unit 12 stores the expansion amount information on a file label that exists in file units. The input / output management means 14 writes data in response to the data write request from the program 15 (step S2).
1). The input / output management means 14 determines whether or not an overflow has occurred in the data writing process (step S22). If the overflow has occurred, the file extension means 13 is activated to extend the file (step S2).
3).

File extension is performed as shown in FIG. That is, when the file extension means 13 receives the overflow notification from the input / output management means 14, it determines whether or not the extension amount is designated based on the file label of the file stored in the magnetic disk 10 (step S).
32). If specified, the unused area in the magnetic disk volume is calculated (step S33), and it is determined whether the specified expansion amount can be expanded (step S).
34). If it is expandable, the free space management area is updated so that the unused area in the magnetic disk volume is managed as the free space of the file (step S35), and the process returns to step S23 and the input / output management is performed as "with expansion". The means 14 is activated. If there is no designation in step S32 or if expansion is not possible in step S34, the process directly returns to step S23.

The started input / output management means 14 determines whether or not the data area of the magnetic disk 10 has been expanded (step S24). If it has been expanded, the data related to the occurrence of the previous overflow is rewritten (step S
25) and ends. If it is not expanded in step S24 and if there is no overflow in step S22, the process ends as usual.

[0011]

As described above, according to the present invention, the extension amount of a file is designated at the time of file allocation, and the file is automatically extended when an overflow occurs in data writing. is there. Since no human intervention is performed during the expansion process, the expansion process will not fail due to human error. Compared with the conventional method, the time required for file extension is very short. When a write request is made to a file, the file can be expanded in a timely manner.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of an automatic file extension system of the present invention.

FIG. 2 is a flowchart showing the operation of the input / output management means of the embodiment of FIG.

FIG. 3 is a flowchart showing the operation of the file extension means of the embodiment of FIG.

[Explanation of symbols]

 10 magnetic disk 11 file allocation means 12 expansion amount designation means 13 file expansion means 14 input / output management means 15 program S21 to S35 steps

Claims (1)

[Claims] 1. A file for expanding a file having a corresponding file label when an overflow occurrence notification is received and an expansion amount designating means for registering an expansion amount at the time of file expansion corresponding to each file label. Input / output for writing data to each file in response to a write request from the expansion means and a program, transmitting an overflow occurrence notification to the file expansion means when an overflow occurs, and rewriting the data after the file is expanded An automatic file extension system comprising: management means.