JPS59212968A - File access system - Google Patents

Abstract

PURPOSE:To shorten the processing time for an access system of a variable length file by detecting the idle sectors distributed continuously and processing these sectors with just a single access. CONSTITUTION:As shown in the figure, the information which sets the number of using blocks and the head block No. corresponding to each document data table is registered to a floppy disk together with the document data. The control is carried out on the basis of the block No. with all subsequent processings. The processing is performed in accordance with the idle control information which is read into a memory by the initial processing. Thus the head position of an idle sector is acquired, and the number of idle sectors continuous from said sector is counted. In such a way, the document data corresponding to a designated block No. is written to a floppy disk with the number of sectors defined as a processing unit. This processing is repeated by a frequency equivalent to the number of designated blocks. Thus all document data are written. Then the register processing is through by maintaining the idle control information and the directory information after adding finally the header information.

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to a file management function that has a floppy disk as an external storage device, and is particularly suitable for accessing variable-length files that manage empty space on a sector-by-sector basis. Regarding file access methods.

[Background of the invention]

Conventionally, in a variable-length file access method that manages empty spaces in sectors, the access is performed in sector units because the empty areas may be disposed of discontinuously. In this case, even if the vacancies are arranged consecutively, internal processing such as updating sector numbers occurs between accesses, resulting in unnecessary rotational waiting time.
This had a significant impact on the overall processing time.

[Purpose of the invention]

SUMMARY OF THE INVENTION An object of the present invention is to provide a file access method that reduces processing time by minimizing the number of accesses to a floppy disk.

Summary of the Invention] Rotation waiting time occupies a large portion of the processing time of a 70-tube disk. The cause of this rotational waiting time is the number of accesses, and conventionally, when accessing in units of sectors, the number of accesses was proportional to the amount of data to be processed.

The present invention reduces processing time by processing consecutively located empty sectors in one access, with the aim of minimizing the number of accesses that cause rotational waiting time. measure.

[Embodiments of the invention]

Hereinafter, one embodiment of the present invention will be explained with reference to FIGS. 1 to 1o. FIG. 1 is a configuration diagram showing an example of a device to which the present invention is applied. l is an input device, 2 is a display device, 3 is a printing device, 4 is a memory, and 5 is a floppy disk device as an external storage device. be. FIG. 2 shows a configuration diagram of the document data table in the memory 4. As shown in FIG. The document information input from the input device 1 is displayed on the display device 2 and simultaneously stored in the document data table shown in FIG. Create.

When registering the document data created in this way to the 70 disk drive 5, the document data in Figure 2 is moved sector by sector as shown in Figure 3 in order to register only valid data in the document data table. At the same time, management information for the document data on the floppy disk shown in FIG. 4 is created. Figure 4 shows information that sets the first block number and the number of used blocks corresponding to each document data table. It is registered on the floppy disk together with the document data, and all subsequent processing is managed by the block number. Ru. The program number is logical position information on the floppy disk, and the number of blocks is equal to the number of sectors.

When the registration preprocessing is completed as described above, control is passed to the file management department using the document name and the total number of blocks as parameters. The file management department has a function to register the document data shown in Figure 3 while referring to each piece of management information written on the floppy disk, and conversely, a function to register the document data shown in Figure 3.
It has a function of reading data from the 0tsupid disk onto the memory 4.

In this embodiment, the registration procedure will be explained, but the reading procedure can also be realized by the same procedure as the registration. Before explaining the registration procedure, various management information written on the floppy disk will be explained.

FIG. 5 shows an overall configuration diagram of data on a floppy disk. An identification name indicating that this floppy disk is a 70-bit disk for documents is written on the volume label. The empty management information is information indicating whether the document storage area is used or not in sector units, and its details are shown in FIG. This information represents 1 sector of information with 1 focus,
The bit position and sector position have a similar relationship. The header information is information that is added to the beginning of each document data and indicates the position (tran 1, sector) on the floppy disk for the block number, and its structure is shown in FIG. Directory information includes data such as text, document name, header position, total number of sectors, etc. in the heading section of each document.

The procedure for registering document data based on the above management information will be explained. Figure 8 shows the overall flow of the process.
FIG. 9 shows the flow of processing in the process of detecting empty sectors from nitrogen management information. - FIG. 10 is a diagram showing changes in data during the registration process of each management information and the amount of access to the 70-day disk. When the process shown in Figure 9 is executed based on the empty management information read into the memory in the initial process, the start position of the empty sector (trunk 2, sector 5) is obtained, and this is further contiguous across sectors. By counting the number of empty sectors, this number of sectors is used as a processing unit, and the document data corresponding to the designated block number is written to the floppy disk. By repeating the above process for a specified number of blocks, all the document data is written, and finally, after adding header information, the empty management information and directory information are maintained, and the registration process is completed.

Conventionally, the unit of access to a floppy disk was only one sector, and even when empty sectors were arranged consecutively, there was no intermittent processing, and the number of accesses was equal to the specified number of blocks.Rotation waiting time had a significant impact on the overall registration time. However, according to the present invention, by detecting consecutive empty sectors and combining them into one access, the overall registration time can be shortened by minimizing the factors that cause rotation waiting time. effective.

〔Effect of the invention〕

According to the present invention, by minimizing the number of accesses that cause the rotational waiting time of the floppy disk, it is possible to significantly shorten the overall processing time.

Furthermore, since the present invention does not affect the file management method, it can be applied to any type of machine and has extremely high versatility.

[Brief explanation of drawings]

Figure 1 is an equipment configuration diagram of an embodiment of the present invention, Figures 2 and 3 are
Figure 4 is a configuration diagram of document data on memory, Figure 4 is a configuration diagram of document data management information, Figure 5 is a data configuration diagram of a floppy disk device, and Figure 6 is a configuration diagram of management information. FIG. 7 is a configuration diagram of header information, FIGS. 8 and 9 are explanatory diagrams showing the flow of registration processing, and FIG. 10 is a display diagram showing changes in various information during the registration process. 1... Input device, 2... Display device, 3... Printing device, 4... Memory, 5... Floppy disk device. ＼Goto・' 1st blade 4 Figure 50 Figure g Figure 'i Figure 70

Claims (1)

[Claims] 1. Means for detecting continuously located empty sectors in the number of accesses of a variable-length file that performs empty management on a sector-by-sector basis, and by processing the sectors in one access, A file access method characterized by shortening processing time.