JP2912657B2 - File access processor - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a file access processing device for accessing a file stored in an external storage device, and in particular, to a file access environment with a reduced I / O access environment. The present invention relates to a file access processing device that can be set according to the number of times.

When accessing a file stored in an external storage device, the data processing device reads file attribute information from a file attribute management list of the external storage device, and sets a file access environment according to the read file attribute information to set the file. Is accessed. In the process of reading the file attribute information, in order to speed up the data processing, it is necessary to reduce the number of accesses to the external storage device so that the file access environment can be quickly set. .

[Conventional technology]

The data processing device includes a buffering unit for temporarily storing the file attribute information of the file attribute management list on the data processing device side so that the file attribute information of the file attribute management list can be read at high speed. When the file attribute information of the file to be accessed is not stored in the buffering unit, the file attribute information is sequentially obtained from the file attribute management list of the external storage device. By reading the file attribute information in page units and updating the file attribute information of the buffering unit, the corresponding file attribute information is developed in the buffering unit.

In this configuration, the conventional file attribute management book employs a configuration in which file attribute information is integrally managed according to one file attribute management book.

[Problems to be solved by the invention]

In order to be able to set the file access environment at high speed, it is necessary to reduce the number of accesses to the file attribute management book of the external storage device. To this end, it is necessary to increase the memory capacity of the buffer of the buffering unit and adopt a configuration in which the buffering unit can store file attribute information of more files. However,
There is naturally a limit to increasing the memory capacity of the buffer of the buffering unit. From now on, in the prior art,
Since the number of accesses to the file attribute management book of the external storage device cannot be reduced sufficiently, there has been a problem that a file access environment cannot be set at high speed. As a result, the conventional technology has a problem that a file cannot be accessed at high speed.

The present invention has been made in view of such circumstances,
It is an object of the present invention to provide a new file access processing device that enables a file access environment to be executed at a high speed by enabling a file access environment to be set with a smaller number of accesses to an external storage device.

[Means for solving the problem]

 FIG. 1 is a diagram illustrating the principle of the present invention.

In the figure, 1 is a data processing device equipped with the present invention, 2 is an external storage device provided in the data processing device 1 for storing a file 20, and 10 is a file access request unit, The one that makes an access request, 11 is a file access unit that executes an access process to the file 20, and 12 is a file attribute information management unit that controls the acquisition process of the file attribute information of the file 20 , 13 is a buffering unit, a buffer 131 for temporarily storing the file attribute information of the file 20,
An attribute record search unit 132 that performs a search process of a record of file attribute information stored in the buffer 131, and a management list access unit 133 that performs an access process of a file attribute management list developed in the external storage device 2. Reference numeral 21 denotes a first file attribute management list provided in the external storage device 2, which manages file attribute information required for file access processing, and 22 denotes a second file attribute management included in the external storage device 2. The execution of special operations such as file attribute information for improving operability, such as a file name of a kanji assigned to a file, and the amount of expansion required for file expansion processing. This manages the file attribute information required for the operation.

[Action]

In the present invention, the file access request unit 10
Is issued, the file access unit 11
Requests the file attribute information management unit 12 to acquire the file attribute information necessary for the file access process, and upon receiving this request, the file attribute information management unit 12 Request the file attribute information of the file 20 to be accessed.

Upon receiving the file attribute information read processing request from the file attribute information management unit 12, the attribute record search unit 13
Step 2 searches for the requested file attribute information in the buffer 131. If the requested file attribute information is expanded in the buffer 131 according to this search processing, the file attribute information is notified to the file attribute information management unit 12. On the other hand, if the requested file attribute information is not expanded in the buffer 131 in accordance with the search processing, the management list access unit 133 issues an I / O instruction to manage the first file attribute management list 21. File attribute information to be read out in page units
The attribute record search unit 132 searches whether or not the requested file attribute information has been expanded in the buffer 131 in response to the readout process. Is expanded, the file attribute information is stored in the file attribute information management unit 12.
If the requested file attribute information has not been expanded yet, the management file access unit 133 is instructed to read the file attribute information managed by the first file attribute management file 21 continuously. Process.

Then, the file attribute information management unit 12 notifies the file attribute information notified from the buffering unit 13 to the file access unit 11, and the file access unit 11 determines the file access environment according to the notified file attribute information. After setting, access processing to the file 20 stored in the external storage device 2 is executed.

As described above, in the present invention, the file attribute information is divided and the buffering unit 13 reads out only the file attribute information necessary for the file access processing from the first file attribute management book 21. Since the number of pieces of file attribute information stored in the buffer 131 is increased because of the processing, the required file attribute information can be immediately obtained from the buffer 131 with a higher probability than before, and The file attribute information with a larger number of information can be read from the external storage device 2 by issuing the I / O instruction once, and therefore, the file access can be performed according to the number of times of access to the external storage device 2 which is smaller than in the related art. You can set the environment. From now on, access to the file 20 can be performed at high speed.

〔Example〕

 Hereinafter, the present invention will be described in detail with reference to examples.

As described in FIG. 1, in the present invention, the file attribute management book of the external storage device 2 is stored in the first file attribute management book.
21 and a second file attribute management book 22. The first file attribute management book 21 includes:
The file attribute information required at the time of file access is configured to be managed, and file attribute information (for example, a kanji file name) for improving the operability is stored in the second file attribute information management book 22. It is characterized in that it is configured to manage file attribute information necessary for execution of a special operation.

That is, in the case of an example of a file attribute management book for managing the file attribute information of the sequential file, the first attribute
As shown in FIG. 2 (a), the file attribute management book 21 is the file attribute information required at the time of file access. ”And the second
As shown in FIG. 2 (b), the file attribute management book 22 manages information such as "management common part" which is file attribute information not required at the time of file access. The attribute data of the “management system common unit” managed by the first file attribute management book 21 includes, for example, a “last update time”, a “last reference time”, a “space amount of the entire file”, and the like. The attribute data of the “common part” includes, for example, “file organization”, “record format”, and “average record length”. For example, the attribute data of the “SEQ structure specific part” includes “storage structure” and “circulation type”. "And" Maximum record length ". The attribute data of the “management common section” managed by the second file attribute management book 22 includes, for example, “creation time” and “creator user identifier”.

As described above, since the file attribute information is divided and managed, if the file attribute information of one specific file 20 is viewed, the file attribute information required for file access can be reduced by a small record size. That is, it can be managed (managed by the first file attribute management book 21).

The processing executed by the present invention for setting the file access environment is the same as the conventional processing as shown in the flowchart of FIG. When the setting request is made, as shown in step 2, the file attribute information management unit
12 requests the buffering unit 13 to acquire file attribute information necessary for file access, and then, as shown in step 3, the buffering unit 13 If there is certain file attribute information, it notifies the file access information 11 by notifying the file attribute information management unit 12 as it is. On the other hand, if there is no requested file attribute information in the buffer 131, as shown in step 4 Then, by reading the file attribute information from the first file attribute management book 21 into the buffer 131 in page units, the requested file attribute information is expanded in the buffer 131 and
, And as shown in step 5,
The file access unit 11 performs processing to access the file 20 according to the file attribute information.

In the access processing executed in this manner, according to the present invention, the first management is performed along with the division management of the file attribute information.
Since the record size of the file attribute information stored in the file attribute management book 21 is small, the case of the present invention shown in FIG. 4A and the case of the prior art shown in FIG. As can be understood from the comparison, the file attribute information relating to more files 20 can be expanded in the buffer 131, so that the necessary file attribute information can be immediately obtained from the buffer 131 with a higher probability than before. Since the number of pieces of file attribute information that can be read by one access to the external storage device 2 increases, the file attribute information can be obtained in accordance with the number of accesses to the external storage device 2 that is smaller than in the related art. .

〔The invention's effect〕

As described above, according to the present invention, it is possible to obtain file attribute information required for file access according to a smaller number of I / O accesses than in the related art. From this, the file access processing can be executed at high speed.

[Brief description of the drawings]

FIG. 1 is a block diagram showing the principle of the present invention, FIG. 2 is an embodiment of a file attribute management book for sequential files, FIG. 3 is a flowchart executed by the present invention, and FIG. FIG. In the figure, 1 is a data processing device, 2 is an external storage device, 10 is a file access request unit, 11 is a file access unit, 12 is a file attribute information management unit, 13 is a buffering unit, 20 is a file, and 21 is a first , 22 is a second file attribute management book, 131 is a buffer, 132 is an attribute record search unit, and 133 is a management list access unit.

Continuation of the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) G06F 12/00

Claims (1)

(57) [Claims] 1. A file access processing device for accessing a file stored in an external storage device, wherein: a first file attribute management book for managing file attribute information required for setting a file access environment; A file attribute management book for managing file attribute information and a file access environment setting request issued in accordance with two management book structures, a second file attribute management book for managing file attribute information not required for setting the environment. Accordingly, a buffering unit that reads out the file attribute information from the first file attribute management list and temporarily stores the file attribute information only for the file attribute information managed by the first file attribute management list, File access environment according to the file attribute information stored in the buffering unit. Set, further comprising a file access unit to access the file stored in the external storage device, the file access processing apparatus characterized.