JPH0239225A - Filing system - Google Patents

Abstract

PURPOSE:To shorten the overall file access time with higher efficiency by retrieving the corresponding header information in the order of higher using frequency and performing an access to a file via a file storing part based on the retrieved header information. CONSTITUTION:An input device 4 designates the name of a file to receive an access from an optical disk device 1. A system controller 5 inputting the input of the file name controls a magnetic disk device 2 and reads out each header information written into the device 2 at and after the head one to retrieve the corresponding header information. When this header information is not retrieved out of the device 2, a new file is produced as necessary and stored in the device 1. At the same time, the header information on the new file is written into the device 2. While the file pointed by the retrieved corresponding header information is read out of the device 1 and loaded into a data memory 3. Then those stored header information on the files are arranged in the order of higher using frequency and the device 2 is rewritten.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Field of Industrial Application) The present invention relates to a file system that performs file input/output management such as file access and file writing for a file storage device.

(Prior Art) Conventionally, operating systems have adopted file systems that perform file input/output management for file storage devices such as optical disks and magnetic disks that store a plurality of files.

Incidentally, file access in such a file system is generally performed by searching for header information written immediately before each file data in a file storage device.

Therefore, the above-described file system has the disadvantage that the larger the amount of files stored in the file storage device, the longer the overall file access time.

Therefore, in recent years, methods have been developed to realize faster file access by storing only the header information of each file in a separate storage device, and searching for the header information stored in this storage device when accessing the file. is used.

However, none of these methods takes into account the possibility of accessing frequently used files faster than accessing less frequently used files, so it is difficult to sufficiently shorten file access time. There was an issue of not being able to do so.

(Problems to be Solved by the Invention) The file system of the present invention is intended to solve the above-mentioned problems, and by accessing frequently used files faster than accessing less frequently used files, it is possible to The purpose is to provide a file system that can more effectively shorten file access time.

[Structure of the Invention] (Means for Solving the Problems) In order to achieve the above-mentioned object, the file system of the present invention includes a file storage section that stores a plurality of files, and a storage location of each file in the file storage section. A header information storage unit that stores header information arranged in order of frequency of use for each file, and by specifying a file name to be accessed, searches for corresponding header information in the header information storage unit that are frequently used. Do things in order,
File access is performed from the file storage section based on the searched header information.

(Function) In the file system of the present invention, by specifying the file name to be accessed, the header information storage section searches for the corresponding header information in order of frequency of use.
Since file access is performed from the file storage area based on the header information retrieved, frequently used files can be accessed faster than less frequently used files, which improves the overall File access time can be more effectively shortened.

(Example) Hereinafter, an example of the present invention will be described in detail based on the drawings.

FIG. 1 is a block diagram for explaining the configuration of a file system according to an embodiment of the present invention.

In the figure, 1 is an optical disk device that performs file read/write operations on an optical disk (not shown) that is a file storage unit that stores multiple files, and 2 is an optical disk device that performs file read/write operations, etc. For a magnetic disk (not shown), which is a header information storage unit that arranges and stores items in descending order of frequency of use,
A magnetic disk device that performs operations such as reading/writing header information, 3 a data memory in which files read from the optical disk are stored as data for processing execution, and 4 an input device for performing various input operations in this system. , 5 is a system controller that controls the entire system, and 6 is a ROM in which a control program executed by the system controller 5 is stored.

Next, the typical operation in this embodiment system will be explained.

FIG. 2 is a flowchart showing the flow of the operation.

First, a file name to be accessed from the optical disk is specified using the human-powered device 4 (step a).

The system controller 5 that has input the file name controls the magnetic disk device 2 to sequentially read each piece of header information written on the magnetic disk starting from the first one, and compares it with the specified file name each time. The corresponding header information is searched for (step b).

If the corresponding header information does not exist on the magnetic disk, create a new file as necessary (step C), save this new file on the optical disk, and save the header of this new file on the magnetic disk. Write information (step d).

On the other hand, if the corresponding header information is retrieved in step b, the system controller 5 searches the optical disk device 1.
is controlled to read the file indicated by the header information from the optical disk and load it into the data memory 4 (step e).

Thereafter, predetermined processing is performed using the file loaded into the data memory 4 (step f).

Next, it is determined whether the file data used in the current process should be saved on the optical disk (step g).

If not saved, the header information of the currently accessed file is deleted from the magnetic disk, and the header information on the magnetic disk is rearranged in descending order of the number of accesses (step h).

On the other hand, when saving a file, unless the header information is changed, the access count of the currently accessed file is increased by one, and each header information on the magnetic disk is rearranged as described above (steps i, h).

Note that if the header information is changed here, the file is treated as a new file, and the header information of the file is newly written on the magnetic disk.

Thus, according to the file system of this embodiment, each header information is arranged and stored on the magnetic disk in order from the header information of the file that has been accessed the most,
When a file name to be accessed is specified, the corresponding header information on the magnetic disk is searched in descending order of the number of accesses, which effectively reduces the overall file access time. becomes possible.

[Effects of the Invention] As explained above, according to the file system of the present invention, frequently used files can be accessed faster than less frequently used files, thereby reducing overall file access. Time can be more effectively shortened.

[Brief explanation of the drawing]

FIG. 1 is a block diagram for explaining the configuration of a file system according to an embodiment of the present invention, and FIG. 2 is a flowchart showing the flow of file access and header information arrangement management in the file system of FIG. 1. 1... Optical disk device, 2... Magnetic disk device,
3...Data memory, 4...Input device, 5...System controller, 6...ROM0 Applicant Toshiba Corporation Representative Patent Attorney Satoshi Suyama - Figure 1

Claims (1)

[Claims] (1) A file storage unit that stores a plurality of files, and a header information storage unit that stores header information indicating the storage location of each file in the file storage unit, arranged in descending order of the frequency of use of each of the files. , by specifying a file name to be accessed, the header information storage unit searches for corresponding header information in order of frequency of use, and the file is accessed from the file storage unit based on the searched header information. A file system characterized by: