JP2835364B2 - Data processing system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a method for setting up an access environment required for inputting / outputting data to / from an external storage device. The present invention relates to a data processing system capable of speeding up processing.

When performing input / output operations on an external storage device,
With the area information (hereinafter referred to as extent information) in the external storage device to be accessed, an access environment having various information for requesting the external storage device to perform an input / output operation must be established (hereinafter referred to as open). No. When the necessary input / output operation is completed, the opened access environment must be closed (hereinafter, referred to as closed).

In recent years, with the increase in speed and capacity of external storage devices, it has become possible to store a large amount of files and data in one external storage device. Therefore, the frequency of performing the open / close processing on the same external storage device has been increasing, and it is desired to speed up the access environment re-establishment processing in order to speed up the processing.

[Conventional technology]

FIG. 5 shows an example of a conventional open / close processing method.

In the figure, 10 is a user program that requests open / close processing, 20 is a file management unit that manages file extent information, 30 is an access environment, and when an access is requested, an input / output operation to an external storage device is started. The requesting input / output management unit, 40 is an access environment storage unit that stores information for requesting the external storage device to start an input / output operation, 41 is the extent information indicating the physical location of the file in the external storage device, 60 Represents an external storage device (DASD) such as a magnetic disk device or an optical disk device.

The file management unit 20 has a functional configuration. An extent information acquisition unit 21 that acquires extent information of a file to be opened in response to an open request from the user program 10, and an open request that requests the input / output management unit 30 to perform open processing. The system includes a processing request unit 22 and a close processing request unit 23 that requests the input / output management unit 30 to perform close processing in response to a close request from the user program 10.

The input / output management unit 30 also includes an open request execution unit 31 for creating an access environment stored in the access environment storage unit 40.
And a close request execution unit 32 for deleting an access environment,
An access request execution unit 33 that refers to the access environment in response to an access request from the user program 10 and requests the external storage device 60 for an input / output operation is provided.

The access environment set in the access environment storage unit 40 includes the extent information 41.

Opening / closing of a file according to the conventional method is processed as follows.

In response to the open request, the extent information acquisition unit 21 searches the external storage device 60 in which the file to be opened exists, and acquires the extent information of the file from a file management book or the like (not shown). The open processing requesting unit 22 processes the input / output management unit 30 to request the open processing, and the open request execution unit 31 accesses the external storage device 60 having various information for requesting the input / output operation. An environment is created and set in the access environment storage unit 40 together with the extent information passed from the file management unit 20.

The access environment established in this way is referred to by the access request execution unit 33 when an access request is made from the user program 10.

When there is a close request from the user program 10, the close processing request unit 23 requests the input / output management unit 30 to perform the close processing, and the close request execution unit 32 of the input / output management unit 30 deletes the access environment.

Since the above processing is performed, for example, if the user program 10 issues the processing request shown in FIG. 5, the file A.61 in the external storage device 60 will be used in the conventional open / close processing. And then open file B 62 of the same external storage device 60,
The access environment is created by, the access environment is deleted once by, and the access environment is created again by.

As described above, in the conventional method, since the extent information is included in the access environment, and the use of the extent information and the other access environment is started and ended at the same time, the same external storage device is used. Even if it was already opened at 60, once the close process was performed, the access environment had to be deleted and the access environment had to be created again for a new open request.

[Problems to be solved by the invention]

Therefore, it is necessary to re-create the access environment every time even if the input / output is to another extent of the same external storage device, and there is a problem that the open process always takes time.

The present invention solves the above-mentioned problem, and enables the extent information to be operated separately from a general access environment. When reopening, if the access environment has already been established, the access environment is changed. An object of the present invention is to enable high-speed open processing by reuse.

[Means for solving the problem]

 FIG. 1 shows a configuration example of the present invention.

As in FIG. 5, 10 is a user program, 20 is a file management unit, 30 is an input / output management unit, 40 is an access environment storage unit, and 60 is an external storage device. In the present invention, the extent information storage unit 50 that stores the extent information is separated from the access environment storage unit 40 that stores the access environment such as the external storage device information. That is, information corresponding to the conventional access environment is configured to be divided into extent information and an access environment including a portion other than the extent information.

The file management unit 20 includes an extent information acquisition unit 21, an open processing request unit 22, and a close processing request unit 23 having processing functions similar to those of the related art, and an open processing determination unit that checks whether an access environment already exists. twenty four,
Extent information replacement processing request unit that requests only extent information replacement processing when an access environment exists
26, a close processing determination unit 25 that determines whether to delete the access environment in response to a close request.

The input / output management unit 30 includes an open request execution unit 31, a close request execution unit 32, and an access request execution unit 33 having processing functions similar to those of the related art, and also includes extent information replacement for replacing extent information of the access environment. The request execution unit 34 is provided.

The file management unit 20 and the input / output management unit 30 process a processing request from the user program 10 as follows.

In response to the open request from the user program 10, the extent information acquisition unit 21 performs a process of acquiring the extent information of the file.
Check whether the access environment has already been created. If not already created, the open processing request unit 22 is called to perform the same open processing as before.

When the access environment has been created, the extent information replacement processing request unit 26 is called. The extent information replacement request unit 26 requests the input / output management unit 30 to replace the new extent information acquired by the extent information acquisition unit 21 with the old extent information stored in the extent information storage unit 50. .

On the other hand, the extent information replacement request execution unit 34 of the input / output management unit 30 performs a process of replacing old extent information in the already created access environment with new extent information.

The close processing determination unit 25 determines whether the access environment is to be deleted or left for the next open in response to a close request from the user program 10. Is performed, and if it is to be left, the process returns to the request source without performing any processing.

The access environment including the created extent information is referred to by the access request execution unit 33 in response to an access request from the user program 10, and the access request execution unit 33 performs a process of requesting an input / output operation according to the access environment. Do.

[Action]

According to the present invention, the access environment is left at the time of closing according to the judgment of the close
At 24, it is determined whether an access environment has been created for the external storage device 60 in which the file of the client exists. If it has not been created, open processing similar to the conventional one is performed. If it has been created, the input / output management unit 30
Is requested to replace the extent information of the already created access environment with new extent information.

As described above, according to the present invention, if the access environment to the external storage device 60 in which the file of the client exists has been created, the extent information of the file and the other access environment are managed separately. Only by performing the process of replacing the extent information with the new extent information, the process of the open request execution unit 31 can be omitted, and the open process can be performed at high speed in response to the reopen request of the same external storage device. become.

〔Example〕

FIG. 2 is an example of a data structure of an access environment according to one embodiment of the present invention, FIG. 3 is a configuration example of a resource table used by a file management unit according to one embodiment of the present invention, and FIG. 4 shows a processing flow of an embodiment.

The access environment is composed of information as shown in FIG. The access environment storage unit 40 includes various physical information such as the number of tracks and cylinders of the external storage device (DASD), information unique to the external storage device such as the number of blocks and block size, and a device ID for identifying the device. And other information required for the operating system (OS) to control input / output requests. It also has a pointer to the extent information storage unit 50.

The extent information storage unit 50 stores extent information indicating the position of the file in the external storage device. For example, the number of extents indicating how many continuous areas the file has, and the extent for each extent,
The number of extent blocks, the first block number, the last block number, and the like are stored.

Assuming that the extent information storage unit 50 stores, for example, values as shown in FIG. 2 (b), the extent is configured as follows. An open file consists of two extents. The first extent is 50 physical blocks from the 31st block to the 80th block in the external storage device. The second extent is 20 physical blocks from the 100th block to the 119th block. Of course, not limited to this, similar information can be managed in various formats.

The file management unit 20 creates and manages a resource table as shown in FIG. 3, for example, in order to determine the presence or absence of an access environment.

In this resource table, as shown in FIG. 3, a user ID for identifying the user program 10, an ID of the access environment for identifying the access environment, a device ID for identifying the external storage device 60,
A use flag or the like indicating whether or not the access environment is being used is provided.

The file management unit 20 responds to the first open request by
It requests the input / output management unit 30 to perform an open process, and receives, as a process result, an access environment ID uniquely assigned to the created access environment. Based on this information, the access environment ID is set in the entry of the resource table together with the user ID and the device ID. Also, the use flag is set to “1”, and the access environment is set to the use state.

For a normal close request, only the used flag is set to "0" for the corresponding entry in the resource table.

If an open request is made again from the same user program 10, it is checked whether an entry with the same user ID and device ID is already registered in the resource table, and if it is, an access environment is created. It is determined that it has been completed, and based on the ID of the access environment, the input / output management unit 30 is requested to replace it with new extent information.
Then, the use flag is set to “1”.

The access environment is deleted when the user program 10 explicitly issues a close request with an instruction to delete the access environment, or when the user program 10 terminates. , Delete the corresponding entry in the resource table.

FIG. 4 shows an outline of processing according to an embodiment of the present invention.

The processes (a) to (g) shown in FIG. 4 (a) are the process flow of the file management unit 20 and the input / output management unit 30 when the user program 10 issues an open request by the OPEN macro. is there.

(A) Based on the file name related to the open request, a directory such as a file management book is searched to acquire extent information.

(B) Check the resource table shown in FIG. 3 and search for an entry with the same device ID and the same user ID.

(C) Determine whether the access environment has been created.

(D) If the access environment has been created, the old extent information is replaced with new extent information, and the process proceeds to (f).

(E) If the access environment has not been created, that is, if it is the first open request for the same external storage device, the access environment is created. Also, the extent information is combined with the access environment.

(F) Update the resource table. When the access environment is newly created, the user ID, the ID of the access environment, and the device ID are set in the empty entry. Set the file being used to “1”.

(G) User program 10 requesting access environment ID
And terminates the process.

Thereafter, the user program 10 uses the notified access environment ID as a parameter to
Access such as D, WRITE, etc. will be performed. The processing at the time of access is the same as in the related art.

The processes (h) to (j) shown in FIG. 4 (b) are the flow of the process when the user program 10 issues a close request by using the CLOSE macro.

(H) Whether to leave the access environment is determined based on the type of the close request and the like.

(I) If the access environment is not left, the access environment and the extent information are deleted.

(J) Update the resource table. If the access environment is deleted, the corresponding entry in the resource table is deleted; otherwise, the in-use flag is reset.

Note that the system does not automatically determine whether or not to leave the access environment at the time of the close processing, but rather whether or not the user program 10 uses the file of the same external storage device 60 later. , May be specified. Further, at the time of an open request, the user program 10 may be made to explicitly specify whether the access environment has been created or not created.

〔The invention's effect〕

As described above, according to the present invention, in the process of re-establishing the access environment to the same external storage device, the open process can be performed at high speed by combining the already opened access environment and the extent information of the file. Can be
This greatly contributes to the improvement of the input / output performance for another extent of the same external storage device.

[Brief description of the drawings]

FIG. 1 is a configuration example of the present invention, FIG. 2 is an example of a data structure of an access environment according to an embodiment of the present invention, and FIG. 3 is a resource table used by a file management unit according to an embodiment of the present invention. FIG. 4 shows a processing flow of an embodiment of the present invention, and FIG. 5 shows an example of a conventional system. In the figure, 1 is a processing device, 10 is a user program, 20 is a file management unit, 21 is an extent information acquisition unit, 22 is an open processing request unit, 23 is a close processing request unit, 24 is an open processing judgment unit, and 25 is Close processing determination unit, 26 is an extent information replacement processing request unit, 30 is an input / output management unit, 31 is an open request execution unit, 32 is a close request execution unit, 33 is an access request execution unit, 3
4 is an extent information replacement request execution unit, 40 is an access environment storage unit, 50 is an extent information storage unit, 60 is an external storage device, and 61 and 62 are files.

Claims (1)

(57) [Claims] In a data processing system for establishing an access environment for an external storage device used for input / output processing of a file in a file opening process in the external storage device, an extent indicating a position of the file in the external storage device is provided. An input / output management unit that manages an access environment including physical information and unique information of the external storage device itself required for information and input / output processing, and an access environment for the external storage device when a file open request is received. An open processing determining unit that determines whether the access environment exists; and an open processing unit that performs the open process by replacing the extent information of the access environment with the extent information of the open request when the access environment is determined to exist. A data processing system comprising: