JP2953882B2 - Free label address acquisition method for file label area - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a VTOC (Volume Tab) necessary for securing a file area on a large-capacity storage volume.
le of Content (file label area).

[0002]

2. Description of the Related Art Conventionally, an empty file label address of a file label output when a file area is secured has been obtained by executing a hardware key search I / O instruction for a large-capacity storage volume.

[0003]

SUMMARY OF THE INVENTION The above-mentioned conventional VTO
The C free label address acquisition method has a drawback that it takes a long processing time because a free file label address for outputting a file label is obtained by executing an I / O instruction for a large-capacity storage volume.

[0004]

[0005]

Means for Solving the Problems The first invention is a large-capacity storage device.
File label when securing the file area on the storage
Empty label address in the file label area when outputting a file
Address acquisition method, at system startup or when
When installing a large storage volume system,
In the management information and file label area of the volume storage volume
Volume that manages whether access to the
Automatic medium recognition means for creating a control table;
This occurs when access to the file label area is executed.
And refer to the volume control table to
File label area access of mass storage volume first
If the file label area is searched, the file
Unused label area with flag ON for used label area
The label area is set to flag OFF and the file label area
The flag is associated with the relative address of the
Empty label management by arranging in ascending order of address
Empty label management table creation means for creating a table
From the host program on the mass storage volume
In response to a request for securing a file area, the mass storage volume
Secures an area on the
Outputs the instruction to acquire the free label address of the area and
The file label of the file secured at the bell address
Means to output a file area and an empty label address
Search the empty label management table in response to
And the position where the flag is OFF is obtained and
Locate the file label of the mass storage volume
An empty label searcher that converts the label address of the area
And a step.

[0006]

Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram showing an embodiment of the first invention.

The empty label management table creating means 2 is started up by the automatic medium recognition means 3 when the system is started or when the large-capacity storage volume 6 is installed in the system, and the VTOC (Volume Tab) in the large-capacity storage volume 6 is used.
le of Content; file label area)
The used label area of the OC is set to the flag ON, and the unused label area is set to the flag OFF to create the VTOC free label management table 1 while associating the relative address of the VTOC label area with the flag of the VTOC free label management table 1.

When a program requests a file area to be secured on the large-capacity storage volume 6, the file-area securing means 5 secures an area on the large-capacity storage volume 6 and acquires a free label address of the VTOC. For this purpose, the empty label search means 4 is started.

The empty label searching means 4 searches the VTOC empty label management table 1 to obtain a position where the flag is OFF. Next, the acquired position is converted into the VTOC label address of the large-capacity storage volume 6 and the address of the free label is notified to the file area securing means 5.

The file area securing means 5 outputs the file label of the secured file to the label address obtained from the empty label searching means 4, and ends the securing of the file area.

FIG. 2 is a block diagram showing an embodiment of the second invention.

The volume control table 21 is created by the automatic medium recognizing means 24 when the system is started or when the mass storage volume 27 is installed in the system, and the management information of the mass storage volume 27 and the VTO
It manages whether or not access to C has been made.

The empty label management table creating means 23 comprises:
It is started when the access to the VTOC is executed, and if the VTOC access of the mass storage volume 27 is the first, the VTOC in the mass storage volume 27 is
C is searched, and the used label area of VTOC is set to a flag ON,
The unused label area is set to the flag OFF, and the relative label address of the VTOC and the VTOC empty label management table 22 are set.
The VTOC empty label management table 22 is created while associating the bits with the bits.

From the program, the large storage volume 27
When there is a request for securing a file area above, the file area securing means 26 secures an area on the large-capacity storage volume 27 and activates the empty label searching means 25 to acquire an empty label address of the VTOC. I do.

The vacant label search means 25 searches the VTOC vacant label management table 22 to obtain a position where the flag is OFF. Next, the acquired position is converted into the VTOC label address of the large-capacity storage volume 27, and the address of the free label is notified to the file area securing means 26.

The file area securing means 26 outputs the file label of the secured file to the label address obtained from the empty label searching means 25, and ends the securing of the file area.

[0018]

As described above, according to the present invention, when a file area is secured, I
Since the execution of the / O instruction becomes unnecessary, there is an effect that the processing time can be reduced.

Further, by delaying the creation of the VTOC empty label management table until the first access to the large-capacity storage volume, there is an effect that a delay in the startup time can be prevented.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an embodiment of the first invention.

FIG. 2 is a block diagram showing an embodiment of the second invention.

[Explanation of symbols]

 1, 22 VTOC free label management table 2, 23 free label management table creation means 3, 24 automatic medium recognition means 4, 25 free label search means 5, 26 file area securing means 6, 27 large storage volume 21 volume control table

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-4-77938 (JP, A) JP-A-3-232026 (JP, A) JP-A-4-236639 (JP, A) “ACOS software ACOS- 4 / MVP XE Data Management Manual ", 7th edition, NEC Corporation, September 1989, p. 21-25 (58) Field surveyed (Int. Cl. ⁶ , DB name) G06F 12/00 G06F 3/06

Claims (1)

(57) [Claims] 1. A file area on a large-capacity storage volume.
File label for outputting the file label when securing
In the area free label address acquisition method, the system
At startup or at the mass storage volume system
At the time of installation, management information of the mass storage volume and
Whether the file label area has been accessed
Media that creates a volume control table that manages data
Recognition means and access to the file label area
Is executed when the volume control table is executed.
And refer to the file label of the mass storage volume.
If file area access is first, the file label area
Search for the used label area of the file label area
Flag ON and unused label area flag OFF
While corresponding to the relative address of the file label area
The flags in ascending order of the relative address
Empty label tube to create empty label management table
Logical table creation means and the large capacity
Before receiving a request to secure a file area on the storage volume
While securing space on a large storage volume
Instruction for acquiring a free label address in the file label area
Is output to the obtained label address.
File area allocation means to output file label of file
And receiving the empty label address acquisition instruction,
Searches the file management table and finds the position where the flag is OFF.
And the obtained position is stored in the mass storage volume.
To the label address of the file label area
And a vacant label search means.
A method for acquiring an empty label address in the file label area.