JPH02100157A - File protecting system - Google Patents

Abstract

PURPOSE:To prevent a file from being destroyed due to mis-write of a user by designating only a write prohibiting area as a protection area by setting the protection area at part of an external storage medium. CONSTITUTION:A generating means 2 inputs the range of the protection area designated by a designation means 1, and generates protection area information 5 based on the range of the protection area. A registration means 3 registers the protection area information 5 on the external storage medium 4, and a file area 6 is prohibited to write from a time when the registration of the protection area information 5 is completed. A protection means 9, when a write range designated by a request means 10 being overlapped on the file area 6 registered on the protection area table 8, prohibits the write on the file area 6 based on the protection area table 8. In such a way, it is possible to prevent a write prohibition file from being destroyed due to the mis-write, etc.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a file protection method used in a computer system in which files are registered in an external storage medium such as a magnetic disk. This document relates to a file protection method that prohibits writing to files that are currently in use.

[Conventional technology]

Conventionally, in this type of computer system, permission or prohibition of writing to an external storage medium such as a magnetic disk can only be performed for the entire area of the external storage medium. For this reason, in the conventional file protection method, in order to protect a write-protected file, it is necessary to make all areas of the external storage medium, including free areas and write-enabled files, write-protected.

[Problem that the invention seeks to solve]

In the conventional file protection method described above, in order to protect a write-protected file, all areas of the external storage medium, including free space and write-permitted files, must be made write-protected. If you need to write a program or data to a file.

One problem is that it is not possible to write-protect the external storage medium, and there is a risk that a program or data may be written to the write-protected file due to a writing error by the user, resulting in the write-protected file being destroyed. be.

In view of the above-mentioned points, an object of the present invention is to provide a file protection method that can prohibit writing only to write-protected files even if write-protected files, write-permitted files, and free space coexist on the same external storage medium. It's about doing.

[Failure to solve the problem]

The file protection method of the present invention is used in a computer system that registers a file in an external storage medium, and includes a creation means for creating protected area information that specifies a protected area of the external storage medium, and a file created by the creation means. and registration means for registering the protected area information in the external storage medium.

an input means for inputting the protected area information registered in the external storage medium by the registration means; and a protect means for prohibiting writing to the file registered in the protected area inputted by the input means. It is characterized by having the following.

〔Example〕

The present invention will be explained below with reference to Examples.

Referring to FIG. 1, an electronic computer system to which the present invention is applied includes an external storage medium 4. As shown in FIG.

This external storage medium 4 stores protected area information 5 and is provided with a file area 6.

The file protection method according to the present invention includes a specifying means 1 for specifying a protected area in which writing is prohibited.

a creation means 2 for creating protected area information; a registration means 3 for registering Zorotect area information in an external storage medium 4;
an input means 7 for inputting the protected area information 5 and registering it in the protected area table 8;

It includes a protect means 9 for prohibiting writing to the file area 6 registered in the protect area table 8, and a request means 10 for requesting the protect means 9 to write. and 2 creation means 2. Registration means 3. The input means 7.7''' protect area table 8 and protect means 9 are constituted by firmware.

Referring to FIG. 2, the processing in the specifying means 1 is as follows.

The process includes a protect area range designation step 11 and a 1 creation means activation step 12.

Referring to FIG. 3, the processing in 1 creating means 2 is as follows.

The step includes a protect area range designation input step 21, a protect area information creation step 22, and a registration means activation step 23.

Referring to FIG. 4, the processing in the registration means 3 is as follows.

It consists of a protected area information person cast f31 and an external storage medium registration stella f32.

Referring to FIG. 5, the processing in the input means 7 is as follows.

The process includes a protect area information input determination step 71, a protect area information input step 72, and a protect area table registration step 73.

Referring to FIG. 6, the processing at the 7″ protect stage 9 is as follows:
It consists of a protected area table search step 91, a protected area determination step 92, and an external storage medium writing step 93.

Next, the operation of the file protection system configured as described above will be explained with reference to FIGS. 1 to 6.

The specifying means 1 specifies the range of the file area 6 in which the write-protected file is registered in the protected area range specifying step 11, and the creating means 2 in the step 12 of starting the creating means
Start.

The creation means 2 includes a protection area range specification input step 2.
In step 1, the protected area range specified by the specifying means 1 is input, and in the protected area information creation Stella f22, protect area information 5 is created based on this protected area range, and in the registration means starting step 23, the registration means 3 is started. do.

The registration means 3 inputs the Zolotect area information 5 created by the creation means 2 in the Zolotect area information input step 31, and registers this protected area information 5 in the external storage medium 4 in the external storage medium registration step 32. From the time when the registration of the protected area information 5 is completed, the file area 6 becomes write-protected.

The request means 8 specifies a write range for writing a program or data to a certain area of the external storage medium 4, and requests the Zolotect means 7 to write the program or data.

In order to input the protected area information 5 registered in the external storage medium 4, the input means 7 determines whether the protected area information 5 can be inputted in a protected area information input determination step 71. If it is determined in the protect area information input determination step 71 that input is possible, in the protect area information input step 72, the protect area information 5 is input,
It is registered in the protected area table 8.

When the protect means 9 receives the notification of the write request from the request means IO, the protect means 9 performs a protect area table search step 7.
'91, the protected area table 8 is searched, and in the protected area determination step 92, the write range specified by the requesting means 10 based on the protected area table 8 overlaps with the file area 6 registered in the protected area table 8. Determine whether or not. The write range does not overlap with the write-prohibited file area 6 (outside the f-protect area)
If so, writing to the file area 6 is permitted, and data or programs are written to the external storage medium 4 in an external storage medium writing step 93.

If the writing range overlaps the file area 6 for which writing is prohibited (within the f-protect area), that file area 6
External storage medium write step 93
do not execute.

〔Effect of the invention〕

As explained above, the present invention includes a creation means for creating Zolotect area information, a registration means for registering protected area information, an input means for inputting registered Zolotect area information, and writing to a file registered in the protected area. Since we have created a protection method that prohibits writing, it is now possible to set a protected area on a part of an external storage medium, so even if write-protected files, write-enabled files, and free space are mixed on the same external storage medium, write-protected files will not be protected. This has the effect of preventing file destruction due to writing errors by the user.

In addition, the range of the protected area can be set arbitrarily, so
It can handle even if the number of write-protected files increases or decreases.

Figure 1

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an embodiment of the file protection method according to the present invention, FIG. 2 is a flowchart showing the processing in the specifying means shown in FIG. 1, and FIG. Flowchart showing processing in the means. 4 is a flow chart showing the processing in the registration means shown in FIG. 1, FIG. 5 is a flow chart showing the processing in the input means shown in FIG. 1, and FIG. 6 is a flow chart showing the processing in the input means shown in FIG. It is a flowchart which shows the processing in a means. Firmware...File area, 7...Input means, 8...Protect area table, 9...Protect means, 10.
... Request means. Figure 3 Figure 5 Figure 5

Claims (1)

[Claims] 1. Creation means used in a computer system that registers files in an external storage medium, that creates protected area information that specifies a protected area of the external storage medium; and registration that registers the protected area information in the external storage medium. and input means for inputting the protected area information, and protect means for prohibiting writing to a file registered in a protected area corresponding to the protected area information input by the input means. File protection method.