JP3099429B2 - File data storage method in IPL processing - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for storing file data in a main storage device during an IPL (initial program load) process in a computer system having an auxiliary storage device.

[0002]

2. Description of the Related Art In a computer system having an auxiliary storage device, data is stored in either an auxiliary storage file located in the auxiliary storage device or a main storage file located in the main storage device. Each of these files has an identifier, an attribute, header information defining a data size, and file data, and is placed in an auxiliary storage device before the system is started.

When the system is started up (during IPL processing), a boot-only program is operated to initialize each file in the order of entry in the auxiliary storage device.
The program can access these files. Here, in the initialization of the file, first, a file control block (FCB) for controlling access is created based on the header information, and the file control block (FCB) is sequentially set in a system data area (FCB area).
Further, for the main storage file, the file data as the initial value data is similarly secured from the beginning of the file data area, the information is set in the FCB, and then the data is loaded.

In a computer system employing such a file management method, there is a case where it is desired to save data of a main storage file stored during operation when the computer is restarted after an abnormality such as a processor down has occurred. As a storage method, the entire file data area is stored as an uninitialized area, and the files in the auxiliary storage device are opened one by one (header information is read) and linked with the corresponding file data to initialize the FCB. There is a way to
The initialization of the FCB includes, in addition to the setting of the file attribute, a process of reallocating the file data area and linking the FCB with the file data. here,
It is assumed that there is no change in the file data area.
This is the same as in the PL processing.

[0005]

On the other hand, allocation of the entire main storage file data area is usually performed only at the time of IPL processing. However, depending on the system, the FCB is required to register and delete the main storage file during operation.
In addition to the registration and deletion of a file, a process for partially securing and releasing the main storage file data area is performed. When these partial securing and releasing processes are performed, the order of the main storage file data area, which is initially allocated without gaps in the file entry order in the auxiliary storage device, is changed, or an empty area is formed in the middle. Problem.

Further, in this state, if the IPL processing in the save mode in which the file data is left is performed, the IPL processing is performed in the initialization mode in which all areas are cleared when the file data area is allocated based on the FCB state. Since this differs from the area allocation at the time of execution, linking with the file data area cannot be performed correctly. As a result, there is an inconvenience that file data cannot be stored.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems. It is an object of the present invention to repeatedly register and delete files during operation of a system, and to make room in a file data area or to make each file data available. It is an object of the present invention to provide a method for storing file data in IPL processing, which can reliably store file data in a main storage device even when the order of files to be initialized in an auxiliary storage device is not in order.

[0008]

In order to achieve the above object, the present invention provides, in an auxiliary storage device of a computer system, header information defining a file identifier, an attribute, and a file structure, and initial value data. In the IPL processing for initializing files according to the entry order of the file index table indicating the location of the files in the auxiliary storage device, the files are initialized at the time of the IPL processing. A file control block generated based on the header information is generated in an area on the main storage device, and an area on the main storage device that is stored at the time of IPL processing is
File data management information in which file data arrangement information and data size are stored is generated, and the file control block and the file data are linked by referring to the file data management information corresponding to the file control block to be initialized. It is characterized by storing data.

[0009]

According to the present invention, when the file control block on the main storage device is initialized from the file in the auxiliary storage device, the file data management information provided in the area on the main storage device which is stored during the IPL processing is used. By linking the file control block with the file data by referring to it, the file registration and deletion are repeated to create a free space in the file data area, and each file data is arranged in the order of the file to be initialized in the auxiliary storage device. If not, the file data in the main storage device can be saved.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. First, FIG. 2 shows a management structure of files in the auxiliary storage device. In FIG. 2, reference numeral 1 denotes an auxiliary storage device, and a plurality of files 31 to 34 (only four are shown for convenience) therein. ) Is arranged. The arrangement of these files 31 to 34 is set by the index table 2. Here, the files 31 to 34 have file numbers "1" to "4", respectively.
Each of the files 31 to 34 is made up of header information 41 to 44 defining an identifier, an attribute, and a file structure, and file data 51 to 54. On a main storage device (not shown), a file control block (FCB) is generated based on the header information 41 to 44, and
Similarly, a file data area necessary for the main storage device is calculated and secured from the header information 41 to 44, and the file data 51
To 54 are loaded into the main storage device.

Next, a data structure related to file management in the main storage device will be described with reference to FIGS. Note that the area A in these figures is an area that is initialized during IPL processing regardless of the initialization mode or the save mode, and the area B is an area that is saved during IPL processing in the save mode.

FIG. 3 shows a state immediately after IPL processing is performed in the initialization mode. FCBs 61 to 65 corresponding to file numbers “1” to “5” are stored in the system data area in area A. The files are arranged in the order in which they were initialized. In the area B, the file data management information 71 to 7 in which the arrangement and the data size of the file data on the main storage device are stored in the same initialization order.
5 and the main bodies of the file data 51 to 55 are arranged.
Each of the above-mentioned constituent elements has a file number “1” to “5”.
Corresponding to files with.

FIG. 4 shows a data structure after file registration and deletion during the operation of the system. Since the FCB 62 does not point anywhere in the area A in the figure, it can be seen that the file with the file number “2” has been deleted. Therefore, the file data 52 existing in FIG. 3 is lost, and the file numbers “6” and “7” are
Are registered, FCBs 66 and 67, file data management information 76 and 77, and file data 56 and 5
7 is secured.

Here, reference numeral 91 denotes an empty area in the file data area formed by deleting the file with the file number "2". The empty area 91 is managed by the empty area management information 81. The free area management information 81 replaces the conventional file data management information 72, and includes a start address and an area size. Similarly, reference numeral 92 in FIG.
Reference numeral 2 denotes the corresponding free area management information. In this state, the arrangement of the file entries in the file index table 2 shown in FIG. 2 is not equal to the arrangement of the file data in the main storage device.

Next, in the state shown in FIG.
The file data saving method when the PL process is performed will be described with reference to the flowchart of FIG. First, referring to the file index table 2 in the auxiliary storage device 1, the file arrangement is checked from the next entry, and the header information of the corresponding file is read (S1). From the read header information, the area B on the main storage device where the
The corresponding file management information is searched for (S2).

For example, when the file number is "3", it is confirmed whether or not there is corresponding file data management information (S3). In FIG. 4, since the corresponding file data management information 73 exists (S3 YES), this information 7
3 is compared with the data size in the header information 43 to check whether there is any change (S41). If there is no corresponding file data management information in step S3, the file data management information is set to secure a file data area (S42).

In step S41, if the data size is not changed (S41 YES), the file attributes in the header information 43 are checked, and if loading of initial value data is necessary (if initial loading is invalid), the auxiliary storage device is used. The file data is loaded from 1 to the area 53 in FIG. 4 (S5 NO, S62). If the initial load is valid, a saving process is performed (S5 YES, S5
61), the storing process or the loading process (S62).
Is normally performed, the FCB is generated from the free head area 63 in the FCB area of the area A (S7).

FIG. 5 shows the state of the main storage device after performing the IPL processing in the save mode. The file data area allocated by FIG. 4 maintains the state before the IPL processing. The area of the FCB 62 that has been vacant is in a packed state and is in an initialized state. Note that the file with the file number “3” is
Since the data remains allocated to the same area as before the PL processing, file data can be saved.

[0019]

As described above, according to the present invention, the arrangement information of the file data on the main storage device is separated from the FCB,
By providing the file data management information in the area of the main storage device that can be stored at the time of the IPL processing, the initialized FCB and the file data are correctly linked even if the IPL processing is performed after the file is registered or deleted. As a result, file data can be securely stored. This makes it possible to save the file data of the main storage device that has been stored during operation even when the system is restarted after the occurrence of an abnormality such as a processor down.

[Brief description of the drawings]

FIG. 1 is a flowchart showing one embodiment of the present invention.

FIG. 2 is a diagram showing a file management structure in an auxiliary storage device.

FIG. 3 is a diagram showing a data structure related to file management on a main storage device.

FIG. 4 is a diagram showing a data structure related to file management on a main storage device.

FIG. 5 is a diagram showing a data structure related to file management on a main storage device.

[Explanation of symbols]

1 Auxiliary storage device 2 File index table 31, 32, 33, 34 File 41, 42, 43, 44 Header information 51, 52, 53, 54, 55, 56, 57 File data 61, 62, 63, 64, 65, 66, 67 FCB 71, 72, 73, 74, 75, 76, 77 File data management information 81, 82 Free area management information 91, 92 Free area

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-63-49839 (JP, A) JP-A-63-40949 (JP, A) JP-A-63-292251 (JP, A) JP-A 64-64 88626 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) G06F 12/00, 9/06

Claims (1)

(57) [Claims] An auxiliary storage device of a computer system has a plurality of files including header information defining file identifiers, attributes, and file structures, and file data as initial value data. In the IPL process for initializing a file in accordance with the entry order of the file index table indicating the location of the file in the auxiliary storage device, the file is created based on the header information in an area on the main storage device initialized at the time of the IPL process. A file control block to be generated is generated, and an area on the main storage device which is stored during the IPL processing is
File data management information in which file data arrangement information and data size are stored is generated, and the file control block and the file data are linked by referring to the file data management information corresponding to the file control block to be initialized. A method for storing file data in IPL processing, characterized by storing data.