JPS63196959A - Saving and restoring system for file - Google Patents

Abstract

PURPOSE:To simplify an operation for saving and restoring a file, and also, to improve the efficiency for saving and restoring the file, by providing an attribute reading means, a deciding means, a converting means, and plural input means and output means. CONSTITUTION:Physical attribute information of an external storage device 2 from a file catalogue 1 which has been read by an attribute reading means 3, and file attribute information of a file 2a which has become a saving object are written in a saving medium 6 together with a data of the file 2a through the first input and output means. Also, at the time of restoring the file, a second input means 9 reads physical attribute information 7a, file attribute information 7b and a saved data 8 from the medium 6, adds the information 7a, 7b to a deciding means 10, and adds the data 8 to a converting means 11. Subsequently, in accordance with a result of decision from the means 10, a logical converting instruction, a physical converting instruction or a non-converting instruction is given to the means 11, and a conversion processing is executed by the mean 11. In such a way, an operation for saving and restoring the file can be simplified and also, the efficiency for saving and restoring the file can be improved.

Description

[Detailed description of the invention]

[Industrial Application Field] The present invention relates to a file saving and restoring method for saving and restoring files in a computer file system. [Prior Art] A file that has the function of saving a file created in an external storage device to another external storage device, and restoring the saved file to the original external storage device or another external storage device. There are a wide variety of programs supported by the system. For example, with the evacuation function, the physical image recorded on the external storage device (trunk image in the case of a magnetic disk device) is transferred as is to the external storage device for evacuation, and the physical image recorded on the external storage device is There are programs that extract logical records from a physical image and move them to an external storage device for backup. Furthermore, as for the restoration function, there are programs that perform restoration with physical and logical images, respectively, in accordance with the above-mentioned saving method. From a processing efficiency perspective, the most efficient method is to save as a physical image and then restore as a physical image, but this method requires that the external storage device where the file to be evacuated is created and the file to be restored are The physical attributes of the included restoration light and the external storage device (track capacity for hard disks) are the same, and the file attributes (block length, record length, etc.) of the file to be evacuated and the file to be restored are the same. If the physical attributes and file attributes are different, use a program that extracts the logical record from the physical image recorded on the external storage device and moves it to the external storage device for backup. The file must be saved using a logical image and then restored using a program that restores the file using a logical image, which results in lower processing efficiency than when saving and restoring using a physical image. Recently, the data stored in computers has been shifting from traditional numerical data to multimedia data, and in response, a variety of external storage devices have become available in terms of hardware. Files are increasingly being saved and restored using logical images. Furthermore, conventionally, when saving and restoring files, the operator decides which program to run, taking into consideration the physical attributes of the external storage device and the file attributes. In other words, if the physical attributes and file attributes of the external storage device are the same, an efficient program for saving and restoring is executed using a physical image, and when the physical attributes and file attributes are different, a logical image is used to execute the program. I am trying to run a program to save and restore. When saving files, if it is not decided in advance where to restore the files, be sure to use a logical image to prepare for the possibility of restoring to an external storage device with different physical and file attributes. I am trying to prepare a program to save and restore.

[Problems to be solved by the invention]

As mentioned above, conventionally, programs to be executed when saving and restoring are used differently depending on the physical attributes of the external storage device and the file attributes, which causes the problem of cumbersome operations when saving and restoring files. In addition, if it has not been determined where to restore the file, or if the physical attributes and file attributes of the external storage device are different, a program that saves and restores using a logical image must be executed. Therefore, there was a problem that processing efficiency deteriorated. The present invention solves the above-mentioned problems, and its purpose is to simplify operations for saving and restoring files, and to save files. The purpose is to enable efficient restoration. [Means for Solving the Problems] In order to solve the above-mentioned problems, the present invention saves files created in a first external storage device to a second external storage device, and In a file system having a function of restoring files evacuated to a storage device to the first external storage device or the third external storage device, file attribute information of files created in the first external storage device. and attribute reading means for reading physical attribute information of the first external storage device from a management file; and first input means for reading the physical image of the file created in the first external storage device as it is. , a first method for writing the physical image read by the first input means into the second external storage device as it is together with the file attribute information and the physical attribute information read by the attribute reading means; an output means for reading the physical image written in the second external storage device as it is, and outputting file attribute information and physical attribute information written together with the physical image. A second input means for reading compares the file attribute information of the saved file read by the second input means with the file attribute information of the file to be restored, and also compares the file attribute information of the file to be restored. The physical attribute information of the first external storage device is compared with the physical attribute information of the external storage device in which the file to be restored is created, and the second input means reads the data based on the comparison result. a determining means for determining how to convert the physical image; a converting means for converting the physical image read by the second input means according to the determination result of the determining means; A second output means is provided for outputting the conversion result of the means as a physical image to an external storage device of restored light. [Function] When saving a file created in the first external storage device, file attribute information of the above file. The physical attribute information of the first external storage device is also written to the second external storage device, which is the evacuation medium, together with the physical image of the file. When restoring a file evacuated to the second external storage device, the determination means compares the file attribute information of the evacuated file with the file attribute information of the file to be restored, and also compares the file attribute information of the evacuated file with the file attribute information of the file to be restored. The physical attribute information is compared with the physical attribute information of the external storage device in which the file to be restored is created, and based on the comparison result, it is determined how to convert the physical image, and the conversion means Conversion processing is performed according to the determination result of the determination means. (Example) Next, an example of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram of an embodiment of the present invention, in which a song file 2a to be saved is created in an external storage device 2.
Attribute reading means 3 reads the file attribute information of the external storage device 2 and the physical attribute information of the external storage device 2 from a management file such as the file catalog 1a created in the external storage device 1; A first input means 4 that reads in the physical image as it is, and an attribute reading means 3
a first output means 5 that writes the physical attribute information read by the save medium 6, the file attribute information read by the input means 4, and the data read by the input means 4 to the save medium 6; and the physical attribute information 7a written to the save medium 6. a second input means 9 that reads file attribute information 7b and saved data 8; and file attribute information 7b of the file 2a read by the second input means 9 and a file catalog created in the external storage device 14. The file attribute information of the file 13a to be restored created in the external storage device 13 read from the external storage device 14a is compared, and the physical attribute information 7a of the external storage device 2 and the file catalog 14 are compared.
a determining means lO that compares the physical attribute information of the external storage device 13 read from a and outputs a conversion instruction according to the comparison result; a converting means 11 for converting and outputting 8, and a second converting means 11 for converting and outputting the converted signal;
output means 12. Next, the operation shown in FIG. 1 will be explained. In this embodiment, the file attribute information indicates file fixation, block length, and record length. The first input means 4 reads the data of the file 2a created in the external storage device 2 to be saved as it is as a physical image, and the attribute reading means 3 reads the physical attributes of the external storage device 2 from the file catalog 1. Information and files 2
Read the file attribute information of a. The first output means 5 writes the save data read by the first input means 4 to the save medium 6 as is, and also writes the physical attribute information and file attribute information read by the attribute reading means 3 to the save medium 6. It's crowded. When restoring a file, the second input means 9 reads the physical attribute information 7a, the file attribute information 7b, and the saved data 8 from the save medium 6, and adds the physical attribute information 7a and the file attribute information 7b to the determining means 10. , the saved data 8 is added to the conversion means 11. The determining means 10 uses physical attribute information 7a and file attribute information! 7b is added, the process shown in the flowchart of FIG. 2 is started. That is, the determining means 1O first determines the file organization of the evacuated file 2a and the file 13 to be restored.
For each file 2a, check whether or not the file organization of a
, 13a (step 21), and if the file organization matches, the file 2a. It is checked whether the block length and record length of the files 13a are equal by comparing the file attribute information of each file 2a and 13a (step 22). If the file organization does not match, restoration is impossible. If it is determined in step 22 that the block length and record length of files 2a and 13a are equal,
It is determined whether the physical attributes of the external storage devices 2.13 match (step 23). If it is determined that the physical attributes do not match, a physical conversion instruction is given to the conversion means 11 as it is necessary to perform physical conversion on the saved data 8 (step 25), and the physical attributes are matched. If it is determined that the number of ships has been converted to the evacuation data, it is assumed that there is no need to convert the evacuation data, and a non-conversion instruction is added to the conversion means 11 (step 24).If the judgment result in step 22 is NO, that is, , if at least one of the block length and record length is different, it is necessary to perform logical conversion on the saved data 8, and a logical conversion instruction is added to the conversion means 11 (step 26). The conversion means 11 receives a logical conversion instruction from the determination means 10. By adding a physical conversion instruction or a no-conversion instruction, the processing shown in the flowchart of FIG. 3 is performed. The conversion means 11 determines whether the instruction from the determination means 10 is a logical conversion instruction, a physical conversion instruction, or a non-conversion instruction in steps 31 and 32, and distributes the conversion work. Logical conversion takes place in steps 33 to 35. In step 33, a block image is extracted from the physical image of the saved data 8, and a logical record is extracted from the block image. In step 34, the logical record is stored according to the block length of the file 13a to be restored, When a block is full, the process of storing records in the next block is performed for all the logical records extracted in step 33.If the record length of file 2a and the record length of file 13a are different, the records are stored in the next block in step 33. After performing processing to make the record length of the logical record equal to the record length of file 13a, processing is performed to store it in a block,
If the record length of file 2a is shorter, a predetermined value is added to the logical record extracted in step 33 to make the record length match the record length of file 13a, and then the process is performed to store it in a block, If the record length of file 2a is longer, delete the later items that cannot be stored in the logical record items extracted in step 33 or the separately specified items to make the record length match the record length of file 13a. After that, processing is performed to store it in a block. In step 35, the blocks created in step 34 are sequentially arranged to create and output a physical image (track image in the case of a magnetic disk device) for the external storage device 13. If it is determined that the instruction from is a physical conversion instruction, the extracted block image is arranged in accordance with the physical image of the restoration device (step 36).In any of the above cases, the restoration The capacity of the previous file 13a is larger than that of file 2a.
When the capacity is larger than the capacity of the block, an empty image is created in the surplus block. Further, when the conversion means 11 determines in step 31 that the instruction from the determination means 10 is a non-conversion instruction, the conversion means 11 outputs the saved data 8 from the second input means 9.
is output as is (step 37). FIG. 4 is a diagram showing an example of logical conversion performed by the conversion means 11. Now, for example, one unit of the physical image in the saved data 8 is composed of two blocks Bl and B2, as shown in +a) of the same figure, and each block Bl and B2 has four logical records R1, respectively. ~R4, R5~R8
is stored, and one unit of the physical image of the restoration destination external storage device 13 consists of four blocks B'1-B'
4, and two logical records are stored in each block B'l to B'4. By performing the process of step 34, the block B'1 to B'4 is Logical records R1 and R2 are stored in block B'2, logical records R3 and R4 are stored in block B'3, logical records R5 and R6 are stored in block B'3, and logical records R7 and R8 are stored in block B'4. By performing the process of step 35, block B'l
, B'2.8'3.8'4. Further, FIG. 5 is a diagram showing an example of the physical conversion performed by the conversion means 11. Now, for example, one unit of the physical image in the saved data 8 is composed of three blocks Bl, B2.B3, and each block B1.B2.B3 has three blocks, as shown in the figure (al). Records R1 to R
3, R4 to R6, R7 to R9 are stored, and assuming that the physical image of the external storage device 13 at the restoration destination has a capacity per unit that can only store two blocks, the conversion The means 11 stores data for one unit of the physical image of the external storage device 13, as shown in the same figure (bl).
Only blocks B1 and B2 are output, and block B3 is output for the next unit. [Effects of the Invention] As explained above, the present invention saves file attribute information of the file when saving a file. The physical attribute information of the external storage device in which the above file is created is also saved, and when restoring the file, the above file attribute information, the file attribute information of the file to be restored, the above physical attribute information, and It determines how to convert the physical image of the evacuated file based on the physical attribute information of the external storage device where the file to be restored is created, and performs the conversion process according to the determination result. , evacuate files in only one way. Since the data can be restored, it is easier to save and restore files compared to the conventional method in which different programs had to be used depending on the physical attributes of the external storage device and the file attributes. It has the effect of Further, since the present invention always saves the file as a physical image when saving the file, processing efficiency can be increased compared to the conventional example.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of an embodiment of the present invention, FIG. 2 is a flowchart showing the processing contents of the determination means 10, FIG. 3 is a flowchart showing the processing contents of the conversion means 11, and FIG. 4 is an example of logical conversion. and FIG. 5 are diagrams showing an example of physical conversion. 1, 2.13.14...external storage device, la, 14
a... File catalog, 2a, 13a... File, 3... Attribute reading means, 4... First input means,
5... First output means, 6... Saving medium, 7a...
・Physical attribute information, 7b...File attribute information, 8.
...Evacuation data, 9...Second input means, 10...
Judgment means, 11... Conversion means, 12... Second output means.

Claims (1)

[Scope of Claims] A file created in a first external storage device is saved in a second external storage device, and a file saved in the second external storage device is saved in the first external storage device or the second external storage device. In the file system having a function of restoring to an external storage device according to No. 3, file attribute information of a file created in the first external storage device and physical attribute information of the first external storage device are retrieved from a management file. attribute reading means for reading; a first input means for reading the physical image of the file created in the first external storage device; and a first input means for reading the physical image read by the first input means as it is. a first output means for writing to the second external storage device together with the file attribute information and the physical attribute information read by the attribute reading means; a second input means for reading a physical image as it is, and reading file attribute information and physical attribute information written together with the physical image; Compare the file attribute information of the saved file and the file attribute information of the file to be restored, and also compare the physical attribute information of the first external storage device read by the second input means with the restored file. determining means for comparing the physical attribute information of the external storage device in which the file is created and determining how to convert the physical image read by the second input means based on the comparison result; , converting means for converting the physical image read by the second input means according to the determination result of the determining means; and outputting the conversion result of the converting means as a physical image to an external storage device as a restoration destination. and a second output means for saving and restoring files.