JPH0588949A - Disk file management device - Google Patents

Abstract

PURPOSE:To minimize the extent of movement of a disk head on a disk by assigning continuous blocks at the time of writing a data file and writing the data file in the write area, which is determined by a discriminated file size, with a certain number of blocks. CONSTITUTION:A write area of a disk device is designated by a designating part 2 in accordance with the file size of the data file to be written in the data file area. The write file size is discriminated in a write part 3 by a data file write instruction, and the data file is written in the write area, which is determined by the size, with a certain number of blocks. The written data file is registered in a data management table of the disk device 1 by a register part 4. The written data file is deleted from the disk device 1 by a deleting part 5, and registration of the deleted data file is deleted from the data file management table by a registration deleting part 6.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disk file management device, and more particularly to a disk file management device in a disk device.

[0002]

2. Description of the Related Art Generally, management of a data file on a disk is performed by dividing a data file area on the disk into blocks of a certain size, and managing the data files having information on the usage status of each block. It is done by a table. Data file management table 1
The contents of the entry have information such as whether or not a data file is used, if one data file is larger than one block, the number of the block in which the data follows, and whether or not the data file cannot be used due to a defect in the disk medium.

When writing one data file on the disk, the data file management table on the disk is referred to, and writing is sequentially performed while searching for an empty block in the data file area. At this time, the used file is registered in the data file management table corresponding to the blocks of the data file area to which data has been written at the same time.
If the data file is larger than one block, the record number of the next writable block is written in the data file management table. As a result, it is possible to understand how one data file is chained on the disk and uses the data file area.

With such a management method, even if the blocks of the data file area on the disk are not continuous, the blocks are chained, so that the data file area on the disk can be used efficiently. ..

[0005]

However, writing data files of different sizes on the same disk,
When the deletion is repeated, the continuity of empty blocks for writing the data file in the data file area is lost, and the chain structure in the data file area of one data file becomes complicated. Especially, when the size of the data file is large and many discontinuous blocks are used, when reading and writing the data file, the amount of movement of the disk head becomes larger than when using continuous blocks. This causes the inconvenience of being delayed in time.

The present invention has been made in view of the above problems. When writing a data file in the data file area on the disc, continuous blocks are allocated and the data is read and written by the disc head on the disc. It is an object of the present invention to provide a disk file management device that can minimize the amount of data transfer.

[0007]

That is, the present invention provides a disk device having a data file area and a data file management table, and a write area in the disk device depending on the file size to be written in the data file area of the disk device. When a data file write command is issued from a host computer and a designating means for designating, a writing means for determining a file size to be written and writing a data file in a certain size in a writing area designated by the file size by the above-mentioned designating means Registration means for registering the data file written by the writing means in the data file management table of the disk device, deletion means for deleting the data file written in the data file area of the disk device, and Data files deleted by the deletion method And a registration deletion means for deleting the file from the registration of the data file management table, and divides the writing portion of the data file on the disk device into the upper direction and the lower direction of the data file area according to the data file size. It is characterized in that the written portion of the above-mentioned data file is made continuous by writing the data.

[0008]

In the disk file management device of the present invention, the write blocks in the data file area of the data file on the disk device are continuously taken. Then, the write area in the disk device is determined in advance by the size of the data file to be written in the data file area of the disk device, and when the data file write command is received from the host computer, the file size to be written is determined, In the writing area defined by the above file size, with a fixed number of blocks,
The data file is written, and the written data file is registered in the data management table. Also,
Equipped with a process to delete the written data file,
The deleted data file is deleted from the registration of the data file management table.

[0009]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram showing the basic configuration of a disk file management device of the present invention. A disk device 1 having a data file area and a data file management table is designed according to the file size written in the data file area. A writing section 3 for designating a writing area, a writing section 3 for judging a file size to be written and writing a data file in a certain size in the writing area designated by the designating section 2, and writing by this writing section 3 The registered data file is coupled to the registration unit 4 that registers the data file in the data file management table. Furthermore, the disk device 1 deletes the data file written in the data file management table, and deletes the data file deleted by the deletion unit 5 from the registration in the data file management table. It is connected to the erasing unit 6.

In the disk file management device having such a configuration, the designating section 2 designates the write area in the disk device 1 according to the file size to be written in the data file area in the disk device 1. And
When a data file write command is received from a host computer (not shown), the writing unit 3 determines the file size to be written, and writes the data file in a certain size in the writing area designated by the file size in the designation unit 2 described above. .. The data file written by the writing unit 3 is registered in the data file management table in the disk device 1.

On the other hand, the data file written in the data file management table of the disk device 1 is deleted by the deleting unit 5. The data file deleted by the deleting unit 5 is deleted from the registration in the data file management table by the registration deleting unit 6. Then, the writing portion of the data file on the disk device 1 is separately written in the upper direction and the lower direction of the data file area according to the data file. This ensures that the written portion of the data file is continuous.

Next, a disk file management device according to an embodiment of the present invention will be described with reference to the schematic block diagram of FIG. In FIG. 1, the host computer 11 has a CPU 12 for controlling the operation of the host computer 11 and a ROM 13 in which a microprogram is stored. These CPU 12 and ROM 13 are connected by a host bus 14. A RAM 15 and a disk device 16 outside the host computer 11 are coupled to the host bus 14. The RAM 15 stores a program for controlling and managing the disk device 16, and the disk device 16 has a disk 17 which is a medium for storing data.

The structure of the disk 17 in the disk device 16 is as shown in FIG. 3 (a). That is, a reserved area 01, two data file management tables 02 that store the usage status of the data files on the disk, and a data file that manages the name of the data file, the date and time of writing, etc. It is composed of a directory 03 and a data file area 04 for storing data of an actual data file.

Further, the data file management table 02
As shown in FIG. 3B, one entry of the data file management table 02 and one block of the data file area 04 are
Corresponds to one-to-one. A block is the minimum unit when writing a data file. Next, the operation of the embodiment will be described with reference to the flowcharts of FIGS.

First, the operation of writing the data file to the disk will be described with reference to FIG. First, when a data file write request is issued from the host computer 11, the disk device 16 checks the size of the data file to be written and obtains the number of blocks used in the data file area 04 used for writing the data file. (Step S1). Next, it is checked whether or not there is a margin in the area to be written in the data file area 04 with the number of blocks used in the data file to be written (step S2).

In step S2, if there is no room to write in the data file area 04, the host computer 11 is notified that writing is not possible (step S3), and the process ends. On the other hand, if writing to the data file area 04 is possible, it is checked whether the number of blocks used for writing is within the range of the predetermined number of blocks (step S4). Here, the predetermined number of blocks means the blocks in the data file area 04 used in the maximum and minimum sizes of the data file area 04 when the data file size to be written in the data file area 04 is concentrated in a certain area. Is a number.

In step S4, if the number of blocks is within the range, the data file management table 02
Allocation of data files with the number of blocks determined in
This is performed in the lower direction of the data file area 04 of the disk 17 (direction of arrow Y in FIG. 3A) (step S
5). Next, the data file is actually written in the data file area 04 in block units (step S7).

On the other hand, in step S4, if the number of blocks to be used is out of the determined range, the size of the data file to be written and the required number of blocks are allocated to the data file management table 02. At this time, contrary to step S5, in the upper direction of the data file area 04 of the disk 17 (direction of arrow X in FIG. 3A).
Are allocated to each other (step S6).

After that, in order to actually write the data file in the data file area 04, the process proceeds to step S7.
After writing the data file to the data file area 04 in step S7, the data file name is registered in the data file directory 03 (step S7).
8) The data file writing process ends. next,
The operation of deleting the data file from the disk 17 will be described with reference to FIG.

When there is a data file deletion request from the host computer 11, the data file to be deleted is searched from the data file 03 in the data file directory 03 of the disk 17 (step S11). Then, in step S12, if the data file to be deleted is found, the process proceeds to step S13, and if not found, the process proceeds to step S14.

When the data file name is found in step S12, the block used in the data file is released from the data file management table 02 (step S13). After that, the registration of the data file name is deleted from the data file directory corresponding to the block in the data file area 04 used in the data file from the data file management table 02 (step S15). In this way, the data file deleting process is completed.

If the data file name is not found in step S12, the host computer 11 is notified that there is no data file to be deleted (step S14), and the process ends.

In this way, a certain data file is stored in the data file area 04 of the disk 17 within a certain size.
Are always written in the same number of blocks in the lower direction (the direction of the arrow Y in FIG. 3A). Therefore, the deletion of the data file is always performed with the same number of blocks. As a result, even if the above-mentioned data file deletion and writing operations are repeatedly performed, the writing block used for one data file is the data file area 0.
In 4, the blocks are arranged in a continuous manner without being dispersed, and a continuous area of the data file is secured. When handling large data such as image data as a certain data file within a certain size range, access to the data file disk 17 is always continuous, and blocks are distributed and arranged. Access time is shortened compared to.

In this embodiment, the data file 17 having a predetermined size is arranged in the lower direction of the data file area 04 (the arrow Y direction in FIG. 3A).
It may be in the upper direction (the direction of the arrow X in the figure (a)). Next, a second embodiment of the present invention will be described.

FIG. 6 shows another structural example of the disk in the disk device 16 shown in FIG. In FIG. 6, the disk 17 'has a reserved area 05, two data file management tables 06, a data file directory 07,
It is composed of n data areas 08-1 to 08-n. Next, the operation of the second embodiment will be described with reference to the flowchart of FIG.

To write a data file to the disk 17 ', first, when the host computer 11 makes a data file write request, the size of the write data file is checked and the data file used for writing the data file is checked. The number of used blocks in the area 08 is obtained (step S21). Then, the number of blocks used by the data file to be written is checked to see if there is enough room in the data file area 08 for writing (step S22).

If it is determined in step S22 that there is no room for writing in the data file area 08, the host computer 11 is notified that writing is impossible (step S24), and the process is terminated. On the other hand, if it is possible to write to the data file area 08 in step S22,
The number of blocks to be used in the data file is determined in advance, and a process for determining which of the data file areas 08-1 to 08-n is to be written is performed (step S24).

Next, in step S24, a data file area (08-
No. 1 to 08-n), the data file is allocated to the data file management table with a fixed number of write blocks (step S25). Thereafter, the data file is actually written in the data file area (step S26), the data file name is registered in the data file directory 07 (step S27), and the process is terminated.

In the second embodiment, the operation of the data file deletion request from the host computer 11 is as follows.
Since it is the same as the case of the first embodiment described above, the description thereof will be omitted.

In the case of the above-mentioned first embodiment, a data file of a certain size is written in the data file area 04 on the disk with the same number of blocks within a certain fixed range. In the case of, all the data files can secure a continuous block.

[0032]

As described above, according to the present invention, it is possible to take a continuous area in the data file area of the data file written on the disk, and at the time of reading the data file, the minimum disk area is required. This can be performed by the moving amount of the head, and the disk access time can be improved. This is especially effective when the disk is accessed frequently and when a large data file is handled.

[Brief description of drawings]

FIG. 1 is a block diagram showing a basic configuration of a disk file management device according to the present invention.

FIG. 2 is a schematic block diagram of a disk file management device according to the present invention.

FIG. 3 is a diagram illustrating the structure of a disc in the disc device shown in FIG.

FIG. 4 is a flow chart for explaining the operation of the disk file management device in the first embodiment and for explaining the operation of writing the data file to the disk.

FIG. 5 is a flow chart for explaining the operation of the disk file management device in the first embodiment and for explaining the operation of deleting a data file from the disk.

FIG. 6 is a diagram showing a disk structure of a disk file management device in a second embodiment of the present invention.

FIG. 7 is a flowchart illustrating the operation of the disk file management device in the second embodiment.

[Explanation of symbols]

1, 16 ... Disk device, 2 ... Designating unit, 3 ... Writing unit, 4
... registration unit, 5 ... deletion unit, 6 ... deregistration unit, 11 ... host computer, 12 ... CPU, 13 ... ROM, 14 ... host bus, 15 ... RAM, 17 ... disk.

Claims (2)

[Claims] 1. A disk device having a data file area and a data file management table; specifying means for specifying a write area in the disk device according to a file size to be written in the data file area of the disk device; When a data file write command is received, the file size to be written is determined, and a writing means for writing the data file in a certain size to the writing area designated by the file size by the above-mentioned designating means, and this writing means A registration means for registering the data file in the data file management table of the disk device, a deletion means for deleting the data file written in the data file area of the disk device, and a data file deleted by the deletion means. The above data file management table By erasing the registration deletion means for erasing from the registration of the file, by writing the writing portion of the data file on the above-mentioned disk device separately in the upper direction and the lower direction of the data file area according to the data file size, A disk file management device, characterized in that the write portion of the data file is made continuous. 2. The disk file management device according to claim 1, wherein the designation means divides the data file area into a plurality of blocks and designates a write block according to a size of a data file to be written.