JPH06110741A - Computer device - Google Patents

Abstract

PURPOSE:To use a partition flexible and also to change a partition size dynamically even while a system is working. CONSTITUTION:When a file name is inputted, a file control part 3 detects a block number corresponding to the file name and performs access to a data block corresponding to one partition of a magnetic disk device 1. At this time, when the block number exceeding the size of the partition is detected, the partition name and the block number are transmitted to a partition control part 42. The partition control part 42 refers to a partition control table stored in a control table storage part 41, detectes the off-set value of the supply partition corresponding to the partition name, subtracts the off-set value from the block number and performs access to the data block indicated by the block number in the supply partition.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a computer device in which a disk device is divided into a plurality of logical partitions and used for storing files.

[0002]

2. Description of the Related Art Generally, in a computer system, an optical or magnetic disk device is used as an external auxiliary storage device. Disk devices are usually used by dividing them into logical partitions of appropriate size, and the partition size is set only during the initial processing of the device, and files created based on the settings are set during system operation. Is stored.

[0003]

By the way, in such a conventional computer apparatus, it is impossible to change the partition size while the system is in operation because the partition setting is executed only at the time of initial processing. .

Therefore, when creating a new partition or changing the partition size while the system is operating, the initial process of the disk device must be started again to perform partitioning, which is troublesome.
The problem arises.

Further, since one file cannot be created over two or more partitions, there is a problem that the partitions cannot be used flexibly while the system is operating.

Therefore, the present invention has been made in view of such a problem, and provides a computer device which can dynamically change the partition size even when the system is in operation and which can elastically use the partition. The purpose is to

[0007]

In order to achieve the above object, according to the present invention, a disk device is divided into a plurality of partitions, each partition stores a file in a unit of a data block, and a file name is specified by a user. When there is an input, in the computer device that tries to access the file corresponding to that file name,
A partition management table is stored that associates the name of the request partition requesting the data block, the name of the supply partition that supplies the data block to the request partition, and the offset value that offsets the number of the supplied data block. The management table storage unit, the name of the partition in which each file is stored, and the number of the data block that constitutes each file are stored in association with the file name, and when the user inputs the file name. Reads the name and data block number of the partition in which the file corresponding to the file name is stored. If the data block number is within the management range, the partition is accessed based on the data block number, while the data Block number is pipe If the range is exceeded, the file management unit that outputs the data block number and the name of the partition, and the partition name and the data block number that are received from the file management unit, are stored in the management table storage unit. A partition that detects the name of the supply partition corresponding to the name of the partition and its offset value from the table, subtracts the offset value from the data block number, and accesses the supply partition based on the subtracted data block number. And a control unit.

[0008]

In the present invention, when the file name from the user is received, the file management unit reads the name of the partition and the data block number in which the file corresponding to the file name is stored, and the data block number If it is within the management range, the partition is accessed based on the data block number. If the read data block number exceeds the management range, the name of the partition in which the file is stored and the data block number are output.

The partition control unit receives the partition name and the data block number, detects the supply partition name and the offset value corresponding to the partition name from the partition management table of the management table storage unit, and also detects the data block. The offset value is subtracted from the number and the supply partition is accessed based on the data block number after the subtraction.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a computer device according to the present invention will be described below with reference to the drawings. FIG. 1 shows the configuration of a computer device according to the present invention.

This computer device includes a magnetic disk device 1 such as a hard disk, and a magnetic disk control unit 2 for writing and reading files to and from the magnetic disk control unit 1.
And a partition management unit 4 including a management table storage unit 41 and a partition control unit 42.

The file management unit 3 manages the file created by the user with the file control block (FCB) or data block in the directory (see FIG. 4). When the user operates the file, that is, the file name is specified, The file control block corresponding to the file name is detected, the data block number is read, and when the data block number is within the management range, the partition is accessed based on the data block number. However,
Since this device uses a virtual partition to be described later, if a data block number that exceeds the management range is detected, that data block constitutes a request partition that is a virtual partition. And the data block number concerned are sent to the partition management unit 4. In addition, after setting a virtual partition to be described later, a list of data block numbers of request and supply partitions, which are virtual partitions, is received from the partition control unit 42, and the data block numbers are used when creating a file in the virtual partition. It is also configured to do.

Here, the virtual partition includes a request partition for requesting a data block to another partition and a supply partition for supplying a data block to the request partition. The file control block information stored in each file directory includes the file name, file type, file size, file organization method, access control data, and the name of the partition in which the file is stored. Is stored. A free (empty) data block that does not form a file is managed as a free block list from, for example, a pointer indicating the beginning of the free block.

The management table storage unit 41 also stores a partition management table, which will be described later, set by the user.

The partition control unit 42 receives the name of the virtual partition and the data block number exceeding the management range from the file management unit 3, and the supplied partition name and offset corresponding to the partition name from the partition management table. The value is detected, the offset value is subtracted from the data block number, and the supply partition indicated by the supply partition name is accessed based on the data block number after the subtraction. If a virtual partition is set in the partition management table, a chain of supply partitions offset by the above offset value is chained at the end of the free block list of the request partition, and the request partition and supply partition after the chain are chained. The list of the data block numbers of is passed to the file management unit 3.

Since the offset value is set to a different value for each supply partition, the number of the supply data block after the offset is different for each supply partition, and one request partition supplies two or more supplies. It is possible to supply a data block from the partition.

FIG. 2 shows an example of the partition management table 41a stored in the management table storage unit 41.

The partition management table 41a has four columns. Each column has a name of a request partition, a name of a supply partition that supplies a data block to the request partition, and an offset value of the supply partition. A number list of data blocks to be supplied is set correspondingly. Here, as an example, the requested partition name “A”, the supply partition name “C”, the offset value “10000” of the supply partition C, and the supply data block number list “# 9500 to 9999” are set.

The partition management table 41a
The setting of each of the above data, that is, the setting of the virtual partition may be set by the user at the time of initial processing, or may be set or changed while the system is operating.

Here, the setting procedure will be briefly described.
First, access to the supply partition is prohibited, access to the request partition is prohibited, and then the number of the supply data block to be supplied to the request partition from the last block of the free block list of the supply partition is detected. , The requested partition name on the partition management table 41a,
Set the supply partition name, the offset value of the supply partition, and the supply data block number list. Then, the partition control unit 42 refers to the data set in the partition management table 41a and refers to the data set in the partition management table 41a, and as shown in FIG. The supplied data block is chained by offsetting its block number by the offset value. Then, while permitting access to the requesting partition, permitting access to the requesting partition,
The virtual partition setting process is completed.

FIG. 3 shows the movement of data blocks in the supply partition and the request partition when the virtual partition is set.

First, (a) shows a normal virtual partition before being set, and both the partition A and the partition B have data blocks of "# 0 to 9999". When the data is set on the partition management table 41a as shown in FIG. 2, the block number from the partition C to the partition A is "# 9".
500 blocks of 500-9999 "are supplied,
As shown in (b), in the virtual partition A ', "# 19500-", which is obtained by offsetting the data block number by the offset value 10000 of the supply partition,
Partition A has 500 blocks up to 19999 "
Of the virtual partition C ′, the 500 blocks of the virtual partition C ′ are subtracted, and “# 0 to
It will have up to 9499 "of data blocks.

Then, the virtual partitions A'and C
A list of data block numbers of'is sent to the file management unit 3, and in the virtual partitions A'and C ', the file management unit 3 creates files with new data block sizes. In addition, "# 19500-1999
When storing a file in a 9 "data block,
The file management unit 3 accesses the data blocks of “# 9500 to 9999” of the partition C via the partition control unit 42 and stores the file.

Therefore, the partition management table 41
By newly setting or changing the data of a,
You can set a new virtual partition, change the partition size, and even change the previously supplied partition to the requested partition and vice versa.

Next, the access processing to the virtual partition in this apparatus will be described with reference to the drawings.

FIG. 4 shows the state of data blocks and the like when the virtual partition is accessed.

This access processing is started by the user inputting a file name into the apparatus. Normally, when the user inputs a file name, the file name input by the file management section 3 is first input. Is received, the directory corresponding to the file name is searched, the file control block (FCB) and the data block number written in the directory are detected, and the corresponding data block on the partition is accessed.

Here, a case is shown where a user creates a file managed in the directory D in the virtual partitions A and C, and when the user inputs the file name of the file, the file Data block numbers “# 9000” and “#
Since the numbers 9900 "and"# 199950 "are set, each data block is accessed based on the data block number.

However, the partition A has "# 000".
There are only data blocks from 0 to 9999 ", and
Since the file management unit 3 can manage only the range from “# 0000 to 9999”, the file management unit 3 displays “# 9
In the case of the data block numbers of "000" and "# 9900", the data blocks a and b indicated by the numbers can be accessed as usual, but in the case of the data block of "# 19950", the file management unit 3 The partition A is judged to be the request partition, and the partition management unit 4 is notified of the request partition name A and the data block number “# 199”.
Send 50 ".

In the partition management section 4, the partition control section 42 requests the partition name A from the file management section 3 and the data block number "# 1995".
0 "is received and the partition management table 41a is received.
With reference to FIG. 2, the supply partition name C for the request partition A and the offset value “10000” of the supply partition C are detected.

Then, the partition management unit 4 subtracts the offset value "10000" from the data block number "# 19950" from the file management unit 3,
Obtain the data block number “# 9950”, that is, the data block number “# 9950” of the partition C,
The data block number “#” in partition C
The data block c indicated by 9950 "is accessed.

Therefore, according to the present embodiment, the partition control unit 42 refers to the partition management table 41a to manage the data blocks whose numbers exceed the management range of the file management unit 3 to request one file as a partition. Since it can be stored over two or more partitions, the supply partition and the supply partition, the use of the elastic partition is enabled.

Further, in this embodiment, when the free space of the data block is insufficient in a certain partition during the operation of the system, the setting of the partition in the partition management table 41a is changed or the partition management table 41a is changed. Set the partition above as the requested partition, and
By setting another partition with a free data block together with the supply partition, the offset value of the supply partition and the number list of the supply data block, the size of each partition can be dynamically changed as a virtual partition even during system operation. Will be possible.

In this embodiment, the virtual partition has been described as being composed of two partitions, that is, a request partition and a supply partition of partitions A and C, but in the present invention, one virtual partition has three partitions.
It may be composed of more than one partition. In this case, since each supply partition has a different offset value, even if two or more supply partitions supply a data block to one request partition, it is easier than the data block number offset by each offset value. , The supply partition to which each data block is supplied can be determined.

In the case where the virtual partition is limited to only two partitions, the request partition and the supply partition, as in this embodiment, the offset value does not need to be different for each supply partition, and the same value can be used. It doesn't matter.

Further, in the present embodiment, the partition management table 41a includes the requested partition name, supply partition name, offset value of the supply partition,
The description has been made so that the number list of the supply data block is set correspondingly, but the number list of the supply data block is not necessarily set in the present invention. This list only sets the upper limit of the data block supply amount. If this is not set, the data block is supplied from the supply partition to the request partition without any upper limit.

[0037]

As described above, according to the present invention, the partition control unit refers to the partition management table to manage the data blocks whose numbers exceed the management range of the file management unit, and supplies one file as the requested partition. Since it is possible to store data over two or more partitions, it is possible to use elastic partitions.

Further, in the present invention, when the free space of the data block in a certain partition runs short during the system operation, the setting of the partition in the partition management table is changed or the partition in the partition management table is changed. By setting as the request partition and another partition with a free data block as the supply partition along with its offset value, the size of the partition can be dynamically changed even during system operation. become.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of a computer device according to the present invention.

FIG. 2 is an explanatory diagram showing an example of a partition management table.

FIG. 3 is an explanatory diagram showing movement of data blocks.

FIG. 4 is an explanatory diagram showing a state when a virtual partition is accessed.

[Explanation of symbols]

 1 magnetic disk device (disk device) 2 magnetic disk control unit 3 file management unit 4 partition management unit 41 management table storage unit 41a partition management table 42 partition control unit

Claims (1)

[Claims] 1. A disk device is divided into a plurality of partitions, each partition stores files in units of data blocks, and when a user inputs a file name, the file corresponding to that file name is stored. In the computer device that is configured to access the data block, the name of the request partition that requests the data block, the name of the supply partition that supplies the data block to the request partition, and the offset value that offsets the number of the data block that is supplied. The management table storage unit that stores the partition management table that associates the files with each other, the name of the partition in which each file is stored, and the number of the data block that configures each file are stored in association with the file name. File name is input from In this case, the name of the partition and the data block number in which the file corresponding to that file name is stored are read, and if the data block number is within the management range, the partition is accessed based on that data block number. When the data block number exceeds the management range, the file management unit that outputs the data block number and the name of the partition, and the partition name and the data block number from the file management unit are received, and the management table is received. The name of the supply partition corresponding to the name of the partition and its offset value are detected from the partition management table stored in the storage unit, and the offset value is subtracted from the data block number, and the data block number after subtraction is detected. Computer apparatus according to claim basis by comprising a partition control unit to access the supply partition to.