JPS62217337A - File device for log information - Google Patents

Abstract

PURPOSE:To attain the effective use of a file space by connecting plural divided storage areas to store information and separating a faulty area from a group of connected areas. CONSTITUTION:The information is successively written on a log information file 20 when a writing request on the file 20 is performed. If a writing error occurs due to a partial fault of the file 20, an address where the error occurs is recorded on a control information area 100. At the same time, the error occurrence log information is written on an area following the area where the information is presently written. When a reading request for the information written on the file 20 is received, the continuity of the effective log information is secured for plural divided areas and the log information is read out with reference to the writing error occurring address on the area 100. Thus it is possible to secure the effective use of the space of the file 20 even in case a writing error is generated owing to a partial fault of the file 20 since the file 20 is divided into plural area for control and at the same time the error occurring address is recorded for control.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to input/output control means for a log information file device used in a computer system.

〔overview〕

The present invention aims at effective utilization of file space by storing information in a file device that locks the operating state by connecting storage areas divided into a plurality of parts, and separating a faulty area from this connection. It was made so that it could be done.

[Conventional technology]

Conventionally, when an error occurs when writing to a log information file, the writing process is interrupted, a new log information file is allocated, and writing is performed. Additionally, when log information is continuously output, information after the location where a write error has occurred is read from a newly allocated log information file.

[Problem that the invention seeks to solve]

In such a conventional log information file input/output device, if a write error occurs due to a partial failure of the log information file when writing log information, the file space cannot be used after that, and therefore the file space cannot be used effectively. There were some unforeseen flaws.

The present invention aims to eliminate such drawbacks and to provide a log information file device that can effectively utilize file space.

[Means for solving problems]

The present invention provides log information that includes a file that stores information related to events that occur during driving, and a writing/reading means that writes information to this file and reads out the written information in the order in which the information occurs. In the file device, a plurality of areas are set in the above-mentioned file with addresses indicating the order of writing and reading. The above writing/reading method executes the writing of information already written in the specified area and information that occurs subsequent to this information to the area assigned the address in the order following the address of the area specified by the means. The present invention is characterized by comprising a first control means for instructing the means, and a second control means for instructing prohibition of reading information from the specified area.

[For production]

When a request to write to the log information file is made, the log information is sequentially written to the log information file.

If a write error occurs due to a partial failure of the log information file during this write, the address where the error occurred is recorded in the management information area, and this error log information is written again to the area next to the area where it is currently being written. .

When a request is made to read information written in log information, the write error occurrence address in the management information area is referred to, and the log information is read while ensuring the continuity of valid log information in the area divided into multiple areas. read out.

〔Example〕

DESCRIPTION OF THE PREFERRED EMBODIMENTS A device according to an embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram showing the configuration of an apparatus according to an embodiment of the present invention. As shown in FIG. 1, the log information file 20 according to the embodiment of the present invention includes a management information area 100 and a log data section 200 consisting of three areas. The management information area 100 also includes area start address information areas 110, 120 and 130 in which the start addresses of each of the three areas of the log data area 200 are stored, and areas where a write error occurs in each area. Error address information section 111, 121 and 131 that stores addresses
Equipped with.

FIG. 2 is a flowchart showing the operation of the log information writing means used when writing log information to the log information file 20, and FIG. 3 is a flowchart showing the operation of the log information writing means used when writing log information to the log information file 20. 3 is a flowchart showing the operation of a log information reading means used in the process.

First, the operation of the writing means will be explained with reference to FIG. First, log information is written based on a write request to the log data section 200 (step 1), and it is determined whether or not a writing error has occurred (step 2).
If no error occurs, the process will end normally. If an error occurs, record the address of the data area where the error occurred in the corresponding error address information area in the management information area 100. Acquire the start address from the management information unit 100 (step 4), rewrite the log information where the write error occurred to the address acquired in step 4 (step knob 5), and check whether a write error has occurred. In step 6), if an error has occurred, control is returned to step 3, and if no error has occurred, the process ends normally.

Next, the operation of the log information reading means will be explained with reference to FIG. First, step 7) acquires the storage address of the log information to be read based on the log information read request, and determines whether or not the address is recorded in the error address information section in the management information area 100. 8) If the log information is not recorded, read out the log information as is. Step 10) ends normally. If it is recorded in the error address information section, obtain the start address of the area next to the area currently being read from the management information area 100 (step 9), and specify that address to read the log information (step 10). ),finish.

〔Effect of the invention〕

As explained above, even when a write error occurs due to a partial failure in the log information file, the present invention manages the log information file by dividing it into multiple areas and records and manages the address where the error occurred. This has the effect of ensuring the continuity of log information when reading a log information file in which a write error has occurred.

[Brief explanation of drawings]

FIG. 1 is a block configuration diagram showing the configuration of an apparatus according to an embodiment of the present invention. FIG. 2 is a flowchart showing the log information writing operation. FIG. 3 is a flow chart showing the log information read operation. 20... Log information file, 100... Management information area, 200... Log data section, 110.120.13
0...Area start address information section, 111.121.1
31...Write error address information section. Japanese Patent Application Laid-open No. BH62-217337 (4) Operation guide for major cases 3 Figure 32

Claims (1)

[Claims] (1) A log information file that includes a file that stores information related to events that occur during driving, and a writing/reading means that writes information to this file and reads the written information in the order in which it occurs. In the device, a plurality of areas are set in the above file with addresses indicating the order of writing and reading, and a specifying means for specifying the area in which a failure occurred during writing among these areas; The writing/reading means executes writing of the information already written in the specified area and the information generated subsequent to this information to the area assigned the address in the order following the address of the area specified by . A log information file device comprising: a first control means for instructing the user to read information from the specified area; and a second control means for instructing to prohibit reading of information from the specified area.