JPS62254229A - Information processor - Google Patents

Abstract

PURPOSE:To prevent the destruction of data due to misoperation of a user by locking the loading/unloading actions of a floppy disk as long as an open file exists. CONSTITUTION:A control program 11 of a main system 1 controls the number of open files among those files set on a floppy disk 2. When the open processing is carried out with no open file existing, a lock instruction is given to the floppy disk device for loading/unloading actions of the disk 2. While a lock release instruction is delivered to the floppy disk device for the disk 2 when all files are closed on the disk 2.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention provides a file management program and a floppy disk suitable for an information processing apparatus equipped with a floppy disk as an information storage medium, particularly for a system that emphasizes file security. Regarding disk devices.

[Conventional technology]

Conventional floppy disk drives generally allow for easy replacement of 70 disks.
No consideration was given to preventing files on the floppy disk from being destroyed due to the user's mishandling of the floppy disk. Incidentally, a related patent is JP-A-59-92475.

[Problem that the invention seeks to solve]

As described above, conventional floppy disk devices do not take into account the management of the floppy disk in a state where replacement is prohibited and the prevention of replacement, and there is a problem with the security of data on the floppy disk.

The problems of the conventional floppy disk device will be explained in detail below with reference to the drawings.

FIG. 2 shows a block diagram of an example system configuration for explaining the conventional problems. In the figure, 1 is the main system. The main system includes a floppy disk device and a keyboard, which will be described later.

It issues input/output control commands to each control device of the CRT display, waits for their responses, and then performs various system controls.

Reference numeral 11 in the main system is a file management program, which controls files on the floppy disk. 12 is an input/output area 7y for transferring data between the floppy disk device and the main system, and 13 is a data area of the main system.

2 is a floppy disk device (hereinafter referred to as FDD), and 21 is a floppy disk set in the FDD. 5 is an FDD control device, which is connected to the main system via a system bus 8, which will be described later, and is connected to the main system 1.
It receives instructions from and controls data transfer between the main system 1 and the FDD 2.

3 is a CRT display, 6 is a CRT display control device, 4 is a keyboard, 7 is a keyboard control device, 8
is a system bus that connects each input/output control device and the main system 1.

FIG. 3 shows the main system 1 and floppy disk device 2 shown in FIG. 2 in detail.

212 is one file on the floppy disk 21.

Reference numeral 211 is directory information regarding the file on the floppy disk 21, which indicates the file name, address on the floppy disk, size, etc.

111 is a file management table (hereinafter referred to as PCB) necessary when the file management program 11 reads and writes files on the floppy disk, and the file management program 11 reads the directory information 221 and executes the table. This is what generates a book.

FCBll also shows information such as the file name, address on the floppy disk, and size.

112 is an open processing program, 115 is a close processing program, 114 is a read processing program, 1
Reference numeral 15 indicates a write processing program, and the file management program 11 uses these processing programs to read and write from and to the floppy disk.

The processing when the main system 1 reads and writes data to and from the file 212 on the floppy disk will be described below with reference to FIG.

The main system 1 first starts with the open processing program 1.
12, file open processing for the file 212 is performed.

In the open process, the directory information 211 for the file 212 is read into the input/output buffer 12, and
Based on that information, FCB 111 is generated.

Only after performing this open process on the file,
The file management program can read the data in the file 212.

Reading and writing to the file 212 is performed by the reading processing program 114. This is performed by the write processing program 115.

The data to be read is transferred between the file 212 and the data area 130 via the input/output buffer 12, as shown in the figure.

When the size of the file 212 or the like is changed during the write process, the information in the FCB 111 is updated by the write process program 115.

When reading and writing to the file 212 is completed, the main system 1 performs a close process on the file 212.

In the close process, the F changed by the indulgence process
The directory information 211 on the human output buffer 12 is updated based on the information of CBll, and the input/output buffer 12
File 212 that has not yet been written to
The data is written to the floppy disk, and reading and writing to the file 212 is completed.

In this way, data transfer during read/write processing for the file 212 and reference and update of the directory information 211 are performed via the input/output buffer 12. In addition, in order to reduce the number of times the floppy disk 21 is read, for example, when writing data, the data is temporarily stored in the input/output buffer 12, and when the input/output buffer 12 is full, the data is actually saved in the file. written on top. Furthermore, the last remaining data group on the input/output buffer 12 is written to the floppy disk 212 by performing close processing.

That is, the information regarding the file 212 on the main system 1 side and the information regarding the file 212 on the floppy disk 21 side are made consistent for the first time by the closing process.

Under the control of the above file management program, if a floppy disk is replaced while a file is open, data on the human output buffer will not be written to the inserted floppy disk. , the logical file data and the actual data on the floppy disk no longer match.

In addition, the file management program may write to a newly inserted floppy disk based on the directory information of the previous floppy disk, and in this case, the contents of the floppy disk will be destroyed. This problem occurs.

However, in conventional floppy disk devices, floppy disks can be replaced at will, and the user's careless replacement of floppy disks can lead to the above-mentioned destruction of file data.

An object of the present invention is to prevent data on a floppy disk before and after replacement from being destroyed due to replacement of the floppy disk due to user's erroneous operation.

[Means for solving problems]

The purpose of the above is that the file management program of the main system manages the open and closed status of files on the floppy disk, and that the floppy disk device is locked and ejected by commands from the file management program. This can be achieved by providing a lock release mechanism that locks the floppy disk inlet/outlet of the floppy disk device and prohibits replacement of the floppy disk when there is even one open file on the floppy disk. Ru.

[Effect]

The main system's file management program manages the number of open files on the floppy disk, thereby changing the state from a state where there are no open files on the floppy disk.
When performing open processing, a command to lock the floppy disk slot is issued to the floppy disk device, and when all files on the floppy disk are closed, a command is issued to the floppy disk device to lock the floppy disk slot. Issues a command to unlock the entrance/exit.

As a result, a floppy disk device equipped with a lock means for the floppy disk inlet/outlet is controlled so that the floppy disk can be replaced only when there is no open file on the floppy disk, and the floppy disk drive is controlled so that the floppy disk can be replaced only when there is no open file on the floppy disk. By replacing the , you can prevent file data from being destroyed.

〔Example〕

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

FIG. 1 is a block diagram of one embodiment of the present invention.

1.2, 5, 8, 11.21 are the same as in FIG.

Reference numeral 14 denotes a counter register newly added to the main system in order to monitor the floppy disk exchange status in the present invention. This counter register is opened by the file management program 11, and
The number of files that are not closed (remains open) is managed, and when the power is turned on, the initial value is set to φ.

22 is a floppy disk loading/unloading locking device.

51 is a control signal line 26 which is connected to the floppy disk loading/unloading locking device 22 according to a command from the main system 1.
This is a floppy disc loading/unloading lock control device that sends a lock control signal through the floppy disk.

Reference numeral 116 denotes an open processing program to which a lock instruction to the lock control device 51 is newly added, and the procedure of this processing is shown in the flowchart of FIG. 4(α).

Reference numeral 117 denotes a close processing program to which a lock release command to the lock control device 51 is newly added, and the procedure of this processing is shown in the flowchart of FIG. 4(b).

The operation of this embodiment will be explained below with reference to the block diagram of FIG. 1 and the flowchart of FIG. 4.

In the open process as shown in FIG. 4 (α), it is checked at Fl whether the value of the counter register 14 is φ. If the value of the counter register 14 is φ, it is determined that the file that has been opened so far does not exist, and at F2,
The file management program 11 issues a lock command to the floppy disk loading/unloading lock control device 51, and the floppy disk loading/unloading lock device 22 locks the floppy disk loading/unloading port.

If the value of the counter register 14 is not φ, it is determined that there is an open file and the floppy disk loading/unloading port is already locked, and the process of F2 is skipped.

After locking the floppy disk inlet/outlet, conventional file open processing is performed at F3.

In F4, the number of open files has increased by one, so
1 is added to the value of the counter register 14, and the open process is ended.

On the other hand, as shown in FIG. 4(b), in the close process, conventional file close process is performed at F5.

At F6, since the number of open files has decreased by one, the value of the counter register 14 is decremented by one.

In Fl, the value of the counter register 14 is checked to see if it is φ, and if it is φ, it is determined that there is no open file, and in F8, the file management program 11 responds to the floppy disk loading/unloading lock control signal 51. ℃, a lock release command is issued, the floppy disk loading/unloading port is unlocked by the floppy disk loading/unloading lock device 22, and the closing process is completed.

If the value of the counter register 14 is not φ, it is determined that an open file exists, the process of F8 is skipped, and the close process is ended.

By performing the above-described control when the file management program 11 opens and closes files, if at least one file on the floppy disk 21 is open,
It is possible to lock the floppy disk inlet/outlet and prevent the floppy disk from being replaced by mistake.

The circuit of one embodiment of the floppy disk loading/unloading lock device 22 and its control device 51 will be described with reference to the following FIG.

81 is a data bus from the main system 1, 82 is an address bus from the main system 1, and 85 is an I10 write signal from the main system.

511 is an address decoder, and 512 is a D flip-flop.

23 is a control signal line from the lock control device; 221 is a control signal line from the lock control device;
Relay circuit turned on and off by lock control signal, 22
2 is a solenoid 222 by turning on and off the relay circuit.
This is a device that turns on and off the power of the floppy disk, thereby electromagnetically locking the floppy disk slot.

When a lock command or a lock release command is issued from the main system to the lock control device 51, the address bus 8
The signal No. 2 is decoded by the decoder 511, and the chip select signal (C8) 514 becomes low, and the low signal No. 13 is input to α of the D flip-flop. At this time, a high signal is sent to the data bus 81 in the case of a lock command, and a low signal is sent to the data bus 81 in the case of a lock release command.

Therefore, the lock control signal line 23 goes high when a lock command is issued by the main system, and goes low when a lock release command is issued. Here, if the relay circuit 221 is configured so that the power supply circuit of the solenoid 2221 is turned on when the lock control signal line 23 is high and turned off when it is low, the floppy disk loading/unloading port can be locked.

(However, the locking device is configured to electromagnetically lock the solenoid 2221K when the power source is turned on.) As described above, according to this embodiment, even one file on the floppy disk 21 can be opened. When the floppy disk is in the turned-on state, the 70 floppy disk loading/unloading port of the FDD 2 is locked, thereby preventing data destruction due to replacement of a broken floppy disk.

However, according to this embodiment, since the replacement itself can be prohibited, this problem is also solved.

〔Effect of the invention〕

According to the present invention, if even one of the files on the floppy disk is open, the FDD
The floppy disk slot will be locked, so
Since it is possible to prevent the data on the floppy disk from being destroyed due to incorrect replacement of the floppy disk, it has the effect of improving the reliability of the FDD, and it can be used with confidence even by users who are not familiar with the usage of FDDs, etc. .

[Brief explanation of drawings]

FIG. 1 is a block diagram of an embodiment of the present invention, FIG. 2 is a block diagram of an example of a system configuration according to the present invention, FIG. 5 is a block diagram showing file read/write processing, and FIG. 4 (α) , (b) is a flowchart of a program for file open and close processing according to the present invention, and FIG. 5 is a circuit diagram of an embodiment that performs lock control of a floppy disk loading/unloading slot. 1... Main system, 2... Floppy disk drive, 3... CRT
Display, 4... Keyboard, 5... Floppy disk drive control device, 6... CRT display control device, 7... Keyboard control device, 8
. . . System bus, 11 . 117...
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Claims (1)

[Claims] In a computer system equipped with a floppy disk device as an external storage device, the floppy disk device is provided with a locking mechanism for a floppy disk inlet/outlet and a control means for controlling the locking mechanism for the floppy disk inlet/outlet. Manages the prohibition state of floppy disk replacement,
An information processing apparatus characterized in that, when a replacement is prohibited, a floppy disk loading/unloading slot is locked using a control means for controlling the locking mechanism and the locking mechanism.