JPH04260141A - Data shared processor - Google Patents

Abstract

PURPOSE:To easily set the shared state of the files by providing a different file for sharing and referring to a necessary file, and holding the original contents and updating the contents in the case of necessity. CONSTITUTION:In shared control information 4 of an access control part 3, prescribed information for showing a fact that a first directory 1 is in a relation for sharing a file 2 instructed by a second directry (not shown in the figure) is registered. In the access control part 3, in the case the file 2 instructed by a first directory 1 is designated, it is assumed that a first directory 1 does not instruct the file 2 of a file name designated by this request. In this case, the control part 3 determines the second directory by the shared control information Also, in the case an updating processing of the file concerned 2 is required, this control part 3 sets the new file 2 of the same contents as the relevant file 2 so as to instruct by the file name from a first directory 1, and executes the updating processing to the relevant new file 2.

Description

[Detailed description of the invention]

0001

[Industrial Application Field] The present invention relates to file sharing processing in a computer, and in particular to sharing and referencing a required file, saving the original content if necessary, and creating a separate file with updated content. The present invention relates to a data sharing processing device for file sharing that takes into account.

0002

2. Description of the Related Art In computer systems, for example, files are designated by hierarchically structured directories,
It is well known to identify files by directory name and file name.

FIG. 5 is a diagram illustrating an example of such a directory. Assuming that each node of a hierarchical directory is represented by a rectangle and each file is represented by a circle, the file with the file name "C" in the diagram is , for example, by expressing it as "/a/b/C".

[0004] Here, for example, when the plurality of files connected to the directory "/b" are the files of a plurality of modules to be combined as a certain program, the files of their combination specifications, etc., those modules There may be a request to share these files in order to use the ``program'', make necessary modifications to some modules, and configure another program.

[0005] In order to satisfy such requirements, there is a system that allows links to be provided to the same file from two or more directories. In such a system, the user creates a necessary directory such as "b'" and creates a predetermined directory such that, for example, file "/a/b/C" can be accessed as file "/a/b'/C". Execute the command , and set a link from the directory b' to the file "/a/b/C", which is illustrated by the broken line in FIG.

Actually, by executing the above command,
Control information is connected so that "/a/b'/C" is accessed, and it is recorded in the control information that "/a/b/C" should be accessed.

[0007] If such operations are performed for each necessary file, for example, all files under directory b can be accessed from directory b', and files can be shared.

However, in this way the directory b'
If a user of directory B modifies the necessary module file as described above, the files under directory b will naturally be updated, which may have an inconvenient effect on the use of directory b users who do not plan on making such updates. will be given.

[0009] Therefore, the user of directory b' should not share the file to be modified as described above, but should create a new file with the same content as the necessary file and connect it to directory b'. must be done.

0010

[Problem to be solved by the invention] Files can be shared as described above, but it is necessary to set a link for each file, and files that are scheduled to be updated must use the sharing function. Therefore, there is no flexibility in the sharing function, and files must be prepared twice in advance in anticipation of updates, which tends to result in unnecessary occupation of file storage resources.

SUMMARY OF THE INVENTION An object of the present invention is to provide a data sharing processing device that can easily set the sharing status of files and that eliminates the need to prepare files twice in advance even for updated files.

0012

Means for Solving the Problems FIG. 1 is a block diagram showing the configuration of the present invention. The figure shows the configuration of a data sharing processing device, which has a directory 1, a file 2 instructed by the directory 1, and an access control unit 3, and the access control unit 3 processes access requests to the file. .

[0013] In the access request, the system specifies the file to be accessed by the file name of the desired file and the directory name of the directory that indicates the file.

[0014] The access control unit 3 is provided with sharing control information 4, and the sharing control information 4 includes predetermined information indicating that the first directory is in a relationship to share the file specified by the second directory. register.

[0015] When the access control unit 3 receives an access request specifying a file specified by the first directory, if the file with the file name specified in the request is not specified from the first directory, , a second directory is determined based on the shared control information 4, and the request is changed to an access request to a file with the file name indicated by the determined second directory.

[0016] In this way, when processing a request for access to a file with the file name indicated by the second directory, if updating processing of the file is required, a file with the same content as the file is updated. is newly generated, the new file is set to be specified by the file name from the first directory, and the update process is executed on the new file.

[0017]

[Operation] The file sharing processing device of the present invention enables file sharing by registering relationships between directories.

Furthermore, when a file is updated by accessing from a directory where the file does not exist, a new file with the same content is automatically created and the update is made to the new file, so the sharing relationship settings are In this case, there is no need to prepare the file twice in consideration of file update.

[0019]

[Example] When performing file sharing according to the present invention, the user uses a predetermined command to set the directory name set by the user as a real link, and the directory name that indicates the existing file that the user wants to share as a virtual link. Register on 4.

FIG. 2 is a diagram illustrating an example of registering such shared control information, in which "/sumiv" in the virtual link column
If there are actual files pointed to by a directory called ``/sumip,'' a relationship is registered in which these files are shared under the directory name ``/sumip'' in the actual link field.

FIG. 3 is a diagram showing an example of the flow of processing by the processing unit 5 of the access control unit 3 in FIG. .

In processing step 11, the contents of the directory are identified, and if the specified file name is found, processing step 1 is executed.
2, access the file pointed to by that directory as usual.

[0023] In processing step 11, if there is no corresponding file name in the directory, in processing step 13,
Search for the registration of the specified directory name as a real link in the shared control information 4, identify it in processing step 14,
If there is no registration, this access request will be treated as a specification error.

If there is registration, first, in processing step 15, it is determined whether the requested access is file reading or updating, and if it is reading, then in processing step 16, the directory registered as a virtual link in the shared control information is specified, Access the actual file with the specified file name.

In the case of an update request, processing step 17
Copy the contents of the above-mentioned entity file pointed to by the directory registered as a virtual link in the shared control information, create a new entity file with the same name, connect it to the directory of the real link, and then execute it in step 18. Perform access by link.

FIG. 4 is a diagram illustrating an example of a real link and a virtual link. As shown in the figure, if actual files are connected to directories registered in the shared control information as in the example above, respectively. do.

[0027] In that case, the real link "/sumip"
If the file specification is "/A" or "
/C'', the access is executed in the normal manner by the above-mentioned processing step 12.

However, when the file "/B" is requested, since it is not in the real link, the virtual link "/sumi
The file "/B" of "v" is the target of the access, and if it is a read request, data is read from this file in processing step 16.

If it is an update request, processing step 17
Copy the contents of the file "/sumiv/B" with
After the file "/sumip/B" is newly created as shown by the broken line in the figure, the file "/sumip/B" is updated by a real link in processing step 18.

[0030]

[Effects of the Invention] As is clear from the above description, according to the present invention, the file sharing status can be easily set in the computer file sharing process, and even files that are updated can be duplicated in advance. Since there is no need to prepare, there is a significant industrial effect in that the file sharing function can be used efficiently.

[Brief explanation of the drawing]

[Figure 1] Block diagram showing the configuration of the present invention

[Figure 2]
Explanatory diagram of shared control information

[Figure 3] Process flow diagram of the present invention

[Figure 4] Diagram explaining examples of real links and virtual links

[
Figure 5: Illustration of a conventional directory

[Explanation of symbols]

1 Directory 2 File 3 Access control section 4 Shared control information 5 Processing section 10-18 Processing steps

Claims (1)

[Claims] Claim 1: A directory (1), a file (2) directed from the directory, and an access control unit (
3), the access control unit (3) processes an access request to the file (2), and the access request includes:
In a system in which the file to be accessed is specified by the file name of the required file and the directory name of the directory that indicates the file, the access control unit (3) is provided with shared control information (4), The shared control information (4) includes the first directory and the second directory.
The access control unit (3) registers predetermined information indicating that the file specified by the first directory is shared, and when the access control unit (3) receives an access request specifying the file specified by the first directory, , if the file with the file name specified in the request is not specified in the first directory, the second directory is determined based on the shared control information (4), and the determined second directory is specified. When processing a request to access a file with the file name specified by the second directory, update processing of the file is required. In this case, create a new file with the same content as the file, set the new file to be specified from the first directory by the file name, and execute the update process on the new file. A data sharing processing device characterized by being configured as follows.