JP2008234269A - File management system and method, and program - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a file management system that can detect whether file data has been operated by fast and simple processing. <P>SOLUTION: The file management system comprises a summary data generation means for generating summary data depending on the data contents of file data stored in a predetermined storage device, and a virtual file management means for associatively storing the summary data and file identification data identifying the file data from which the summary data has been generated, as virtual file data corresponding to the file data. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a file management system, and more particularly to a system for managing file data changes.

  In recent years, with the widespread use of information processing systems, various types of information are often stored and managed as digital data. For important data, it is indispensable to perform backup in order to prevent data loss in preparation for power down or disaster. In the case of file system data backup or the like, differential backup or the like is used. However, there is a problem that a large amount of processing power is required for discrimination of updated data after a certain point in time.

  For example, in the following two cases, there is a problem that a processing load necessary for the determination is high, or many differences that are far from the original difference are detected. Specifically, in the first case, when only the contents of a file are rewritten while maintaining metadata such as the creation time of the file, the contents must be compared to detect the difference. The burden can increase. Also, in the second case, if the location of the file is moved through the directory, the file is deleted from a difference point of view, even though the actual change was only a change in the management metadata. Since it appears to have been created in a new location, extra backup processing can occur. Under such circumstances, efficient backup is required for large capacity file systems.

  Patent Document 1 discloses a system that uses a hash value of each file to detect a match or mismatch between a backup source file and a backup destination file, and backs up the file to the backup destination if they do not match. Has been. Further, Patent Document 2 discloses a system in which update detection of a file is performed based on a hash value of a file that fluctuates in time.

  However, in any of the systems disclosed in the above patent documents, the hash value of each file is managed in association with the file itself. Then, it is necessary to search and compare in the substantial file system with a huge amount of data, and it is not possible to detect a file that has been updated or the like that still needs to be backed up at high speed. The problem is that the load is high.

JP 2006-268846 A JP 2006-146877 A

  Therefore, the object of the present invention is to provide a file management system that can improve the disadvantages of the above-described conventional example, and in particular, can detect the presence / absence of an operation process for file data by a quick and simple process. And

Therefore, a file management system according to one aspect of the present invention is:
Summary data generating means for generating summary data according to the data content of the file data stored in a predetermined storage device;
Virtual file management means for associating summary data with file specifying data for specifying file data for which the summary data is generated, and storing the file as virtual file data corresponding to the file data;
It is characterized by having.

  According to the above invention, summary data corresponding to the data content of the file data to be managed is generated, and the summary data and the file specifying data for specifying the file data are associated and stored as virtual file data. Thus, by referring to the virtual file data, it is possible to check whether or not the file data has been changed. Therefore, it is not necessary to examine the data contents of the file data itself in detail, and the file management process can be realized at high speed and with a low load.

  The virtual file management means stores the summary data as the file name of the virtual file data. Thereby, virtual file data can be comprised only with summary data which is a file name, and file specific data, and can suppress the data capacity of virtual file data. Therefore, the file data can be managed at a higher speed and with a lower load.

  Further, the summary data generation means generates a hash value calculated based on the data content of the file data as summary data. As described above, by using the hash value based on the data content of the file data as the summary data, the data amount of the summary data can be reduced and the data content can be appropriately expressed. Accordingly, it is possible to more reliably and quickly determine whether or not file data has been changed.

  The virtual file management means is characterized by generating a directory with the summary data as a directory name and storing the virtual file data in this directory. As a result, when virtual file data is generated with the summary data as the file name, even if the file name of the virtual file data is duplicated, a directory for the summary data is generated and any of the virtual files is included therein. By storing data, virtual file data can be properly managed without duplication.

  Further, the virtual file management means is characterized in that path data representing a storage location of file data corresponding to the virtual file data is included in the virtual file data as file specifying data. As a result, the file data can be more accurately identified from the virtual file data, and the corresponding file data can be reliably accessed with reference to the virtual file data. Further, by comparing the path data, it is possible to easily detect the file data whose storage location has been moved without changing the data contents.

  Further, in the present invention, in addition to the above configuration, a file operation detection unit that detects an operation process on file data is provided, and the summary data generation unit and the virtual file management unit operate according to the detection result of the file operation detection unit. It is characterized by that. Thus, since the virtual file data is registered when the file operation is performed on the file data, the update status of the file data can be more accurately reflected on the virtual file data.

  Further, in addition to the above configuration, when the operation processing on the file data detected by the file operation detection unit is changed or deleted, a virtual file deletion unit that deletes the existing virtual file data corresponding to the file data is provided. It is characterized by that. The summary data generation means stores the generated summary data included in the file data, and the file operation detection means acquires the summary data stored in the file data subjected to the operation process, and deletes the virtual file The means is characterized in that the virtual file data is deleted based on the summary data acquired from the file data by the file operation detection means. Thereby, when the file data is changed or deleted, the virtual file data is deleted, and when the file data is newly generated or changed, the new virtual file data is stored. Therefore, the latest status of the file data can be more accurately stored in the virtual file data.

  Furthermore, in addition to the above-described configuration, it is characterized by comprising backup means for comparing virtual file data that fluctuates in time and performing backup processing of file data corresponding to virtual file data based on the comparison result. . As a result, by comparing only virtual file data, it is possible to identify updated file data without accessing all file data, and backup is performed only for the necessary file data. Can do. Accordingly, it is possible to simplify and speed up the processing while ensuring the reliability of the backup processing.

  Another aspect of the present invention is a method for a computer to manage file data stored in a predetermined storage device, and a summary data generation step for generating summary data according to the data content of the file data; A virtual file management step of associating the summary data with the file specifying data for specifying the file data in which the summary data is generated and storing the summary data as virtual file data corresponding to the file data.

  The method includes a file operation detection process in which the computer detects an operation process on the file data, and the summary data generation process and the virtual file management process operate according to the detection result of the file operation detection process. It is characterized by. In the above method, when the operation processing for the file data detected in the file operation detection step is changed or deleted before the virtual file management step, the computer uses the existing virtual file data corresponding to the file data. And a virtual file deleting step of deleting. Further, the method includes a backup step in which the computer compares the virtual file data stored before and after the time, and performs a backup process of the file data corresponding to the virtual file data based on the comparison result. It is characterized by that.

  A program according to another aspect of the present invention includes a summary data generating unit that generates summary data corresponding to the data content of file data in a computer that manages file data stored in a predetermined storage device, and summary data And virtual file management means for associating and storing the file specifying data specifying the file data for which the summary data is generated as virtual file data corresponding to the file data.

  The program further realizes file operation detection means for detecting operation processing on file data in the computer, and the summary data generation means and virtual file management means operate according to the detection result of the file operation detection means. It is characterized by that. In addition, the program may be a virtual file deletion unit that deletes existing virtual file data corresponding to the file data when the operation processing on the file data detected by the file operation detection unit is changed or deleted on the computer. It is characterized by realizing. Further, the program causes the computer to realize a backup unit that compares virtual file data before and after time and performs a backup process of the file data corresponding to the virtual file data based on the comparison result. It is a feature.

  Even the method and program of the above-described configuration have the same operation as the above-described file management system, so that the above-described object of the present invention can be achieved.

  Since the present invention is configured and functions as described above, according to this, summary data corresponding to the data content of the file data to be managed is generated, and this summary data and file specifying data for specifying the file data Are associated and stored as virtual file data. By referring to this virtual file data, it is possible to determine whether or not the file data has been changed. As a result, there is no need to examine the data contents of the file data in detail, and the file management process can be realized at a high speed and with a low load.

  The present invention is characterized in that summary data representing the data content of file data is generated, and the summary data and file specifying data for specifying file data are separately managed as virtual file data. Then, by comparing virtual file data with a small data capacity that changes in time, it is possible to efficiently detect changes in file data and the like with high-speed and simple processing. Hereinafter, a specific configuration and operation will be described in Examples.

  A first embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a functional block diagram showing a configuration of a computer constituting a file management system according to the present invention. 2 to 3 are diagrams illustrating the structure of data stored in the computer, and FIGS. 4 to 6 are diagrams illustrating examples of virtual file data. 7 to 8 are flowcharts showing the operation of the computer.

[Constitution]
As shown in FIG. 1, the computer 1 in this embodiment is a general information processing apparatus including an arithmetic device 10 such as a CPU and a storage device 20 such as a hard disk drive. A file system is constructed in the computer 1, and the generation, change, and deletion of predetermined file data are controlled, and control is performed so as to record / reproduce to / from the storage device 20. The storage device that stores the file data may be another storage device such as a flash memory. Further, the computer 1 is not necessarily limited to recording file data and virtual file data, which will be described later, in a built-in storage device, but an external storage device, a storage device connected via a network (network storage device) ) Recording / reproduction may be performed on a storage device installed in another computer on the network.

  As will be described later, the computer 1 in this embodiment has a function of managing and backing up predetermined file data. For example, the computer 1 operates as a file server or a web server. However, the backup function may be realized by another computer, and the computer 1 described below may be configured by a plurality of computers.

  As shown in FIG. 1, the computing device 10 of the computer 1 first includes an application 11 that generates or changes file data such as a document creation application. In addition, a file operation processing unit 12 realized by an operating system or the like is constructed in the arithmetic device 10, and controls file data recording / reproduction with respect to the storage device 20 in response to a command from the application 11. . The file operation processing unit 12 also operates in response to a command from an operation unit (not shown) or a computer on another network, and moves or deletes file data in the storage device 20. Accordingly, an actual file data storage unit 21 for storing the file data itself is formed in the storage device 20 and is transmitted from file data generated by a user using the application 11 or from another computer on the network. Stored file data and the like are stored.

  Here, an example of the file data stored in the real file data storage unit 21 is shown in FIG. As shown in this figure, the file data 4 is composed of metadata storing a file name, a file storage position (path), and the like, and actual data representing the data content itself. As the file data 4 is managed, a signature corresponding to the data content of the file data 4 is generated as will be described later. The latest one of the signatures is included in the file data 4. Is remembered.

  Further, the file operation detection processing unit 13, the signature generation processing unit 14, and the virtual file management processing unit 15 are constructed in the arithmetic device 10 by incorporating the file management program according to the present invention. . Furthermore, the backup application 16 is constructed by incorporating a backup program. These will be described in detail below.

  The file operation detection processing unit 13 (file operation detection means) has performed an operation on the file data in the actual file data storage unit 21 such as the file operation processing unit 12 generating, changing, or deleting the file data. Act to detect. When the change of the file data or the like is detected, the fact is notified to the signature generation processing unit 14. For example, when a process issues a file operation system call to the operating system kernel, or when the process is linked with a virus scan software that is notified that a change has been received from the file system, a notification is sent from the virus scan software. It can be detected at the received timing.

  Specifically, when the file operation detection processing unit 13 detects that the file data has been operated, the file type information including the storage destination information (path) of the file data, and the operation type such as new generation / change / deletion Is acquired, and signatures already stored in the file data are acquired, and these pieces of information are notified to the signature generation processing unit 14. The operation type is “new creation” when a file is newly created, “change” when the data content of the file data is changed or the storage location (path) of the file data itself is changed. When the data itself is deleted, it is handled as “deleted”.

  The signature generation processing unit 14 (summary data generation means) first determines whether the operation type of the file data received from the file operation detection processing unit 13 is new generation / change / deletion. When the operation type is “new creation” or “change”, a hash value is calculated using a hash function such as “MD5” based on the actual data (data contents) of the file data. The calculated hash value is a value representing the data content of the file data, and is hereinafter referred to as “signature” (summary data). Then, the signature generation processing unit 14 stores the generated signature in the file data that is the generation source (see FIG. 2). At this time, if the previous signature exists in the file data, the previous signature is deleted and the latest signature is stored. In addition, the signature generation processing unit 14 stores the newly generated signature, the operation type information acquired and determined by the file operation detection processing unit 13, and the file name information of the file data. The file management processing unit 15 is notified.

  The virtual file management processing unit 15 (virtual file management means, virtual file deletion means) acquires the signature, operation type information, and file name information notified from the signature generation processing unit 14, and first, the operation type for the file data is “ In the case of “change” or “deletion”, the virtual file data that can be specified from the file name information and the signature is deleted from the virtual file data storage unit 22. That is, the virtual file data having the same file name as the signature (see FIG. 2) acquired from the file data in the file operation detection processing unit 13 is deleted.

  In addition, the virtual file management processing unit 15 generates virtual file data having the generated signature as a file name corresponding to the file data for which the signature is generated, and stores the virtual file data in the virtual file data storage unit 22. . The virtual file data is stored as data contents including path data (file specifying data) to the file data including the file name of the corresponding file data. Therefore, when file data is newly generated, virtual file data having a signature as a new file name is stored. When file data is changed, existing virtual file data corresponding to the file data is stored. Is deleted, virtual file data with the new signature after the change as the file name is stored.

  Here, a configuration example of the virtual file data stored in the virtual file data storage unit 22 is shown in FIG. As shown in this figure, the virtual file data 5 uses the signature of the corresponding file data as the file name, and further holds the path data to the file data (including the file name of the file data) as the data content. . Furthermore, a specific example of virtual file data is shown in FIG. In this figure, virtual file data 51, 52, and 53 are stored. As an example, the virtual file data 51 is configured such that “ef2484...”, Which is a signature generated from the corresponding file data, is set as the file name 51 a in the virtual file data 51. As shown, path data 51b “/home/user1/data/text1.txt” (storage destination) to the corresponding file data stored in the actual file data storage unit 21 is stored.

  The signature generation processing unit 14 and the virtual file management processing unit 15 execute the above-described processing every time a file operation is detected by the file operation detection processing unit 13. Therefore, the virtual file data storage unit 22 stores virtual file data having a signature corresponding to the latest data content of each file data as a file name, and stores path data for each file data. ing.

  The backup application 16 (backup means) is an application that performs backup processing of file data stored in the real file data storage unit 21 using the virtual file data. Specifically, the backup application 16 acquires the contents of the virtual file data storage unit 22 at a certain time and stores them in the backup storage device 30, and similarly stores the virtual file data at a certain time thereafter. The contents of the unit 22 are acquired and stored in the backup storage device 30.

  Then, the backup application 16 compares the file name (signature) and the path data that is the data content for each virtual file data that fluctuates in time. At this time, if there is virtual file data whose file name (signature) does not match between the virtual file data being compared, it is determined that the file data corresponding to this virtual file data has been newly created or changed. Then, a process of referring to the path data and sucking up the corresponding file data is executed. If there is virtual file data that matches the file name (signature) but does not match the path data, the data content of the corresponding file data is not changed and it is determined that only the storage location has been changed. Only file data movement information is downloaded. Then, backup processing is executed based on the sucked data. In addition, since the backup process uses the process performed conventionally, the detailed description is abbreviate | omitted. Further, the backup storage device 30 may be another drive area equipped in the computer 1 or may be another external storage device. Furthermore, another storage device connected to the computer 1 via a network may be used.

[Operation]
Next, the operation of the computer 1 having the above configuration will be described with reference to the data structure diagrams of FIGS. 4 to 6 and the flowcharts of FIGS. First, virtual file data generation processing by the computer 1 will be described with reference to FIGS. 4 to 6 and FIG. 7.

  First, in response to a command from the application 11, file data is generated, changed, moved, or deleted in the actual file data storage unit 21 (step S1). Then, the generation / change / deletion of the file data is detected (file operation detection step), the file name information including the storage destination information (path) of the file data, the operation type information, and the previous data stored in the file data The signature is acquired (step S2). Note that the file operation is detected at the timing when a hook (interrupt processing) to the operating system that handles the file system occurs, or when the notification from the virus scanning software is received in cooperation with the virus scanning software. .

  Subsequently, from the operation type information of the acquired file data, it is determined whether it is new generation / change / deletion (step S3). At this time, if the operation type is “create new” or “change” (Yes in step S4), a signature is generated using a hash function such as “MD5” based on the actual data of the file data. (Step S5, summary data generation step). Thereafter, the generated signature is included in the file data itself and stored (step S6, see FIG. 2). At this time, if the previous signature exists in the file data, the previous one is deleted and only the latest signature is stored. Note that the signature is not necessarily calculated and generated using a hash function, and may be information indicating the content of actual data of file data.

  Subsequently, assuming that the operation type of the file data is “new generation” (No in step S7), virtual file data corresponding to the file data is generated based on the signature or the like, and a new virtual data is newly generated. Store in the file data storage unit 22 (step S9, virtual file management step). For example, as shown by reference numeral 51 in FIG. 4, virtual file data 51 is generated with the signature generated for the file data as the file name 51a and the data content as the path data 51b to the file data. Store in the unit 22. In FIG. 4, similarly, virtual file data 52 and 53 are stored corresponding to the file data in the real file data storage unit 20.

  Here, an operation when the file data is changed, that is, a case where the operation type is “change” in step S7 (Yes in step S7) will be described. Note that the operation type is “change”, not only when the data content of the file data is changed, but also when the data is moved without changing the content of the file data and the storage location (path) is only changed. To include. In this case, first, the virtual file data having the file name that matches the signature acquired from the file data in which the file operation is detected is deleted from the virtual file data storage unit 22 (step S8, virtual file deletion step). For example, if the previous signature acquired from the changed file data matches the file name of the virtual file data 51, 52 shown in FIG. 5, the virtual file data 51, 52 itself is deleted (FIG. 5). )

  Thereafter, virtual file data with the signature newly generated in step S5 as the file name is generated from the changed file data and stored in the virtual file data storage unit 22 (virtual file management step). An example is shown in FIG. For example, when the data content of the file data corresponding to the virtual file data denoted by reference numeral 51 in FIG. 5 is changed, the value of the signature 51a ′ that is the file name of the virtual file data 51 ′ illustrated in FIG. 6 is different. On the other hand, the path data 51b is the same. Further, when the storage position of the file data corresponding to the virtual file data indicated by reference numeral 52 in FIG. 5 is merely moved, the value of the signature 52a that is the file name of the virtual file data 52 ′ shown in FIG. On the other hand, the path 51b is different.

  If the operation type of the detected file data is “delete” (No in step S4, yes in step S7), virtual file data having a file name that matches the signature acquired from the file data is displayed as a virtual file. It deletes from the inside of the data storage part 22 (step S8, virtual file deletion process). Thereafter, since no signature is generated for the file data, virtual file data is not newly generated.

  Next, the backup operation by the backup application 16 will be described with reference to FIG. First, virtual file data is acquired as the contents of the virtual file data storage unit 22 at a certain time (step S11). Here, it is assumed that the virtual file data shown in FIG. 4 is acquired. Thereafter, when a predetermined time for backup has elapsed (Yes in step S12) or when the set time is reached, virtual file data is acquired as the contents of the virtual file data storage unit 22 at that time (step S13). Here, it is assumed that the virtual file data shown in FIG. 6 has been acquired.

  Subsequently, the acquired virtual file data that is mixed in time is compared (step S14). At this time, if a new file name (signature) of virtual file data not included in both exists (Yes in step S15), the virtual file data is referred to by referring to the path of the virtual file data. The file data is sucked up (step S16). If the file data is completely new, the file data is newly generated as a backup file. On the other hand, if the path data 51b is different in the file data 51a, 51a ′ but the file data 51b is the same as the code 51 ′ in FIG. 4 and the code 51 ′ in FIG. 6, the data content of the file data is changed. It is determined that it has been updated, and differential backup is executed (step S17). Also, as shown by reference numeral 52 in FIG. 4 and reference numeral 52 ′ in FIG. 6, when the file name 52 a matches but the path data 52 b and 52 b ′ are different file data (yes in step S 19), the file data There is no change in the data contents, and it is considered that only data movement has occurred. In such a case, only the transfer information of the corresponding file data is downloaded (step S20), and backup processing such as moving the storage destination in the backup file is executed (step S17). Then, the backup process described above is executed until the updated virtual file data disappears (step S18), thereby completing the backup process (backup process).

  As described above, according to the present invention, the signature generated according to the data content of the file data is used as the file name, and the file data is managed as virtual file data including the path to the file data. Whether or not there is an update or the like can be reliably determined. In particular, there is no need to examine the data content of the file data itself in detail, that is, there is no need to scan the file data itself, it is possible to determine whether or not file data is updated by examining virtual file data with a small data capacity, High speed, low load, and efficient file management can be realized.

  Furthermore, since the virtual file data is configured to be readable and writable in the same way as a normal file system, it is not necessary to incorporate special database access means in the backup application, and backup can be realized. Therefore, it can be used in any computer and the versatility can be improved.

  In the above description, the virtual file data is deleted when the file data is changed / deleted. However, the virtual file data may be stored without being deleted. As a result, the change history of the file data can be accumulated and can be used for later file restoration and the like.

  Next, a second embodiment of the present invention will be described with reference to FIGS. FIG. 9 is a diagram illustrating an example of virtual file data in the present embodiment, and FIG. 10 is a flowchart illustrating a part of the operation of the computer 1 in the present embodiment.

  In the present embodiment, when the virtual file management processing unit 15 stores virtual file data in the virtual file data storage unit 22, whether or not there is virtual file data having a matching file name, that is, a signature generated from the file data. Check out. If the signatures match, a directory having the new signature as the directory name is generated in the virtual file data storage unit 22, and the path to the file data with the signature as the file name in the directory is used as the data content. Operates to store the virtual file data it has. The operation is shown in the flowchart of FIG. 10, and an example of the virtual file data is shown in FIG.

  First, as described with reference to the flowchart of FIG. 7 of the first embodiment, when an operation on file data is detected, a signature is generated, and virtual file data having this signature as a file name is stored in the virtual file data storage. Stored in the unit 22 (step S9). At this time, in this embodiment, first, it is checked whether or not virtual file data having the same file name as the generated virtual file data (step S101) already exists in the virtual file data storage unit 22 (step S102). For example, if the virtual file data indicated by reference numeral 55 in FIG. 9 exists, the same signature as the file name 55a is generated (Yes in step S102). Note that the file data corresponding to each signature only coincides with the signature, and the file data itself is different, so the paths are also different (see reference numerals 55b and 57b).

  Then, a directory 56 whose name is the signature that has become the file name 57a of the newly generated virtual file data 57 is generated (step S103). In this directory 56, virtual file data 57 having the signature as the file name 57a and the path 57b to the corresponding file data in the data content is stored (step S104). Thereby, each file data corresponding to each virtual file data can be distinguished. Note that the directory 56 is not limited to generating virtual file data using a signature as a file name, but may include at least information for identifying the corresponding file data.

  As described above, according to the present invention, even if the file data is different, the signature calculated based on each file data, that is, the file name of the virtual file data is duplicated. By changing the directory hierarchy, each virtual file data can be distinguished. Therefore, it is possible to manage the update of the file data more reliably.

  INDUSTRIAL APPLICABILITY The present invention can be used in a computer system having a large capacity file system, a file server, a personal computer, etc., and can also be used in a system for searching while leaving a file change history. With the above applicability.

FIG. 3 is a functional block diagram illustrating a configuration of a computer according to the first embodiment. It is a figure which shows the data structure of the file data disclosed in FIG. It is a figure which shows the data structure of the virtual file data disclosed in FIG. It is a figure which shows the specific data structure of the virtual file data disclosed in FIG. It is a figure which shows the specific data structure of the virtual file data disclosed in FIG. It is a figure which shows the specific data structure of the virtual file data disclosed in FIG. 2 is a flowchart illustrating an operation of the computer disclosed in FIG. 1. 2 is a flowchart illustrating an operation of the computer disclosed in FIG. 1. It is a figure which shows the specific data structure of the virtual file data in Example 2. FIG. FIG. 10 is a diagram illustrating an operation of a computer according to a second embodiment.

Explanation of symbols

1 Computer 4 File Data 5 Virtual File Data 10 Arithmetic Device 11 Application 12 File Operation Processing Unit 13 File Operation Detection Processing Unit 14 Signature Generation Processing Unit 15 Virtual File Management Processing Unit 16 Backup Application 20 Storage Device 21 Real File Data Storage Unit 22 Virtual File data storage unit 30 Backup storage units 51, 51 ′, 52, 52 ′, 53, 55, 57 Virtual file data 56 Directories 51a, 51a ′, 52a, 55a, 57a File names 51b, 52b, 52b ′, 55b, 57b Pass data

Claims (17)

Summary data generating means for generating summary data according to the data content of the file data stored in a predetermined storage device;
Virtual file management means for associating and storing the summary data and file specifying data for specifying the file data for which the summary data was generated as virtual file data corresponding to the file data;
A file management system characterized by comprising: The virtual file management means stores the summary data as a file name of the virtual file data.
The file management system according to claim 1. The summary data generation means generates a hash value calculated based on the data content of the file data as the summary data.
The file management system according to claim 2, wherein: The virtual file management means generates a directory with the summary data as a directory name and stores the virtual file data in the directory;
The file management system according to claim 2 or 3, wherein The virtual file management means includes path data representing a storage destination of the file data corresponding to the virtual file data in the virtual file data as the file specifying data;
5. The file management system according to claim 1, 2, 3 or 4. A file operation detecting means for detecting an operation process for the file data;
The summary data generation unit and the virtual file management unit operate according to a detection result of the file operation detection unit.
6. The file management system according to claim 1, 2, 3, 4 or 5. A virtual file deletion unit that deletes the existing virtual file data corresponding to the file data when the operation processing on the file data detected by the file operation detection unit is a change or deletion;
The file management system according to claim 6. The summary data generation means stores the generated summary data included in the file data,
The file operation detection means acquires the summary data stored in the file data on which operation processing has been performed,
The virtual file deletion means deletes the virtual file data based on the summary data acquired from the file data by the file operation detection means.
The file management system according to claim 7. Comparing the virtual file data before and after the time, comprising backup means for performing a backup process of the file data corresponding to the virtual file data based on the comparison result,
9. The file management system according to claim 1, 2, 3, 4, 5, 6, 7 or 8. A computer manages file data stored in a predetermined storage device,
A summary data generation step of generating summary data according to the data content of the file data;
A virtual file management step of associating and storing the summary data and file specifying data for specifying the file data from which the summary data is generated as virtual file data corresponding to the file data;
A file management method characterized by comprising: The computer has a file operation detection step of detecting operation processing on the file data;
The summary data generation step and the virtual file management step operate according to the detection result of the file operation detection step.
The file management method according to claim 10. Before the virtual file management step, when the operation processing for the file data detected in the file operation detection step is change or deletion, the computer deletes the existing virtual file data corresponding to the file data. Having a virtual file deletion step to delete,
12. The file management method according to claim 11, wherein: The computer has a backup step of comparing the virtual file data stored before and after the time, and performing a backup process of the file data corresponding to the virtual file data based on the comparison result,
The file management method according to claim 10, 11 or 12. In a computer that manages file data stored in a predetermined storage device,
Summary data generation means for generating summary data according to the data content of the file data;
Virtual file management means for associating and storing the summary data and file specifying data for specifying the file data for which the summary data was generated as virtual file data corresponding to the file data;
A program to realize Realizing a file operation detecting means for detecting an operation process for the file data in the computer,
The summary data generation unit and the virtual file management unit operate according to a detection result of the file operation detection unit.
15. The program according to claim 14, wherein:   Realizing a virtual file deletion unit that deletes the existing virtual file data corresponding to the file data when the operation processing on the file data detected by the file operation detection unit is changed or deleted in the computer The program according to claim 15 for causing the program to occur.   15. The backup means for comparing the virtual file data that changes in time with the computer and performing backup processing of the file data corresponding to the virtual file data based on the comparison result. , 15 or 16 program.

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