JPH04273546A - File management system - Google Patents

Abstract

PURPOSE:To enable the restoration of a file by reconnecting an extent cut by a fault by obtaining the assignment of entire areas on an auxiliary storage device. CONSTITUTION:A data writing control part 12 operates a writing control to a file 10 on the auxiliary storage device, and a data reading control part 13 operates a reading control to the file 10. A file assignment managing part 11 manages the assignment of the file 10 by obtaining and updating the assignment of the file 10 from a label by using the data writing control part 12 and the data reading control part 13. A management information pad control part 15 embeds management information at the top of the extent at the time of ensuring the extent and a management information reading control part 16 reads the embedded control information. An extent managing part 14 manages the assignment of each extent of the file 10 by using the management information pad control part 15 and the management information reading control part 16.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a file management system, and more particularly to a file management system on an auxiliary storage device of an information processing system.

0002

[Prior Art] In a general file management system, information regarding file affiliation is collectively managed using a file management label (hereinafter referred to as a label), and when the target file is accessed for the first time, the file management table ( (hereinafter abbreviated as table). From then on, 1
If an extent becomes full by writing data to one file area (hereinafter referred to as an extent), and you try to add more data, the next extent is secured. However, information about newly allocated extents is updated only in the table, and file extents are managed by updating the information on the label based on the information about the extents on the table at the time of the last access to the file. Ta.

The conventional file management system has an auxiliary storage device 41 having labels 42 and extents 43, and a table 44, as shown in FIG. 45 creates a table from the label when the file is accessed for the first time, 46 and 47 update the table when the extent becomes full due to data addition and a new extent is secured, and 48 creates the table after the last access to the file. Shows the update of the label from the table when accessing.

[0004] As described above, in the conventional file management system,
At the time of file access, correct information regarding file extents exists only on the table, and information indicating the affiliation of each extent is not stored on the label or on the file extent.

[0005]

[Problems to be Solved by the Invention] In the conventional file management method described above, if a failure such as an unexpected power cut occurs and the table for managing information about extents is lost, or the label itself is destroyed. If the extent is deleted, there is no information indicating the belongingness of the extent stored anywhere, so there is no way to restore the connection between the severed extents.

The purpose of the present invention is to eliminate the above-mentioned drawbacks, make it possible to grasp the affiliation of all areas on an auxiliary storage device, and recover files by reconnecting extents that have been disconnected due to failure. The objective is to provide a file management method that makes it possible.

[0007]

[Means for Solving the Problems] The file management method of the present invention utilizes means for writing data to a file, means for reading data from the file, and means for writing the data and means for reading the data. a means for managing file belongingness, a means for embedding management information whose elements are an identifier, a file name, a file area number, and a final address for each starting position of a file area, and embedded management information. and means for managing the affiliation of each file area using the means for embedding the management information and the means for reading the management information.

[0008]

Embodiments Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a block diagram showing one embodiment of the present invention. In FIG. 1, one embodiment of the present invention is a file management method on an auxiliary storage device of an information processing system,
A data write control section 12 that writes data to the file 10 on the auxiliary storage device, a data read control section 13 that reads data from the file, and a file affiliation management that manages file affiliation using both control sections 12 and 13. 11, a management information embedding control unit 15 that embeds management information whose elements are an identifier, a file name, a file area number, and a final address for each starting position of a file area, and a management information read control unit that reads the embedded management information. 16, and an extent management section that uses both control sections 15 and 16 to manage the affiliation of each file area.

The data write control section 12 has a function of controlling writing to files on the auxiliary storage device, and the data reading control section 13 has a function of controlling reading of files. File affiliation management section 11
are the data write control section 12 and the data read control section 1
It has a function to manage the file affiliation by acquiring and updating the file affiliation from the label using 3. The management information embedding control unit 15 has a function of embedding management information at the beginning of an extent when securing an extent, and the management information reading control unit 16 has a function of reading the embedded management information. Extent management section 1
4 has a function of managing each extent affiliation of a file by using a management information embedding control section 15 and a management information reading control section 16.

Next, the flow of movement will be described.

FIG. 2 is a diagram showing the flow of operation of the present invention. In FIG. 2, it is assumed that file A exists on the auxiliary storage device 21. Use of file A is extent #12
4 and when extent #1 is secured, label 2
2 and management information 23, its affiliation is managed. A table 25 for controlling the file based on the label 22 is created 26 when the file A is accessed for the first time. When the extent becomes full by writing data to file A, the next extent is secured, but when a new extent is secured, the table is updated and management information is embedded at the beginning of the extent 27, 28. When the file is last accessed, the table 25 is referred to and the label 22 is updated.

FIG. 3 is a block diagram showing a method of referring to management information of each extent in a file. In FIG. 3, an extent 31 stores data, management information 32 includes an identifier, a file name, a file area number, and a final address, and 33 indicates the final address of the extent.

Next, a method of referring to management information in this embodiment will be explained. Reads the management information present at the beginning of each extent of the file. Based on the identifier of the read management information, it is possible to know whether the extent is valid or invalid. If valid, the file name and extent number are recognized; if invalid, the extent is ignored. Also, by referring to the final address, the location of the next management information can be known.

According to the file management method of the present invention, if a failure such as an unexpected power outage occurs during operation and the connection between file extents is severed, the extent can be restored by referring to the embedded management information. Since it is possible to determine whether a file is valid or invalid, and also to know which extent of which file it is, it becomes possible to recover files by reconnecting disconnected file extents. Furthermore, by repeatedly reading the management information from the top position allocated to data storage on the auxiliary storage device, it becomes possible to grasp the affiliation of all areas on the auxiliary storage device.

[0016]

[Effects of the Invention] As explained above, the file management method of the present invention embeds management information including an identifier, file name, file area number, and final address at the beginning of each extent on the auxiliary storage device. As a result, the belongingness of all used areas on the auxiliary storage device can be grasped, and it is possible to recover file extents that could not be recovered using conventional file management methods.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing a file management method according to an embodiment of the present invention.

FIG. 2 is a diagram showing the operation of an embodiment of the present invention.

FIG. 3 is a diagram showing a method of referring to management information of each extent in a file according to an embodiment of the present invention.

FIG. 4 is a block diagram showing a conventional file management method.

[Explanation of symbols]

11 File affiliation management department 12 Data write control section 13 Data reading control section 14 Extent management department 15 Management information embedding control unit 16 Management information reading control section 21 Auxiliary storage device 22 Label 23 Management information 24 Extent 25 Table 31 Extent 32 Management information 33 Final address

Claims (1)

[Claims] Claim 1: A file management method that uses means for writing data to a file on an auxiliary storage device, means for reading data from the file, and means for writing the data and means for reading the data. A means for managing the file affiliation, a means for embedding management information whose elements are an identifier, a file name, a file area number, and a final address for each starting position of a file area, and a means for embedding the embedded management information. A file management method comprising: means for reading; and means for managing the affiliation of each file area by using means for embedding the management information and means for reading the management information.