JP2004287601A - Information processor, file managing method, file managing program, and computer-readable recording medium recorded with the program - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a file managing method for performing high speed access to huge amounts of files and an information processor using this method. <P>SOLUTION: This information processor 1 is provided with a file access executing part 23, a file access execution receiving part 21 and an index managing part 22. A storage device 40 divides one connected FC into a plurality files FD, and stores those divided files FC, and an access executing part 23 performs access to those respective files FD by using a file system 30 for performing sequential file access. A file access instruction receiving part 21 receives access position information where positions to be accessed are specified with positions in the connected file FC and a file access instruction from an application 10. An index managing part 22 specifies the divided files FD including the positions shown by the access position information and the access positions in the divided files DF based on the positions in the connected file FC of those respective files FD and the sizes of those respective files FD, and makes a file access executing part 23 executes access to the divided files FD. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a file management method, an information processing apparatus, a file management program for accessing a huge file used for a database or the like at a high speed, and a computer-readable recording medium recording the program.
[0002]
[Prior art]
Conventionally, in a sequential file system, data access to a necessary portion has been performed by issuing an instruction to the file system to skip data from a data position accessing the data to a required portion. . Therefore, in a file system that does not have the function of moving to the previous position, if a necessary part is located before the accessed data position, the file access position is moved to the beginning of the data, and then the required The instruction to skip the data up to the part was issued.
[0003]
Further, the speed of the data access method has been improved by improving the file system as disclosed in Patent Document 1 and the like.
[0004]
Patent Document 1 discloses a management table management process for realizing access to actual data as fast as possible when item information increases and the management table must be stored in a work file. An apparatus is described. Specifically, the management processing device of the management table implements access to the real data stored in the work file by managing a pointer for accessing the real data specified by the item information. In the management processing device for the management table, the management table is divided into management blocks in units of a fixed number of items, and the divided management blocks are stored in a work file. A management block storage area for expanding any one of the management blocks and the number of items of valid item information managed by each of the management blocks are stored in a main storage device of a data processing device to be executed. And an effective item number storage area for accessing the actual data when an actual data access request is made. The control block where the managing item information identifying the actual data obtained in accordance with the effective item number is stored, formed by managed so to expand the above management block storage area from the working file.
[0005]
[Patent Document 1]
Japanese Patent Publication No. 6-82334 (publication date: October 19, 1994)
[0006]
[Problems to be solved by the invention]
In many conventional file systems, the operation differs depending on the type, but in response to an instruction to skip data, the data is skipped by the minimum file management size (sector size (for example, 512 bytes)) of the data. Therefore, in order to skip 5 MB when the sector size is, for example, 512 bytes, it is necessary to manage (5 MB = 522,880 bytes) / 512 = 10,240 sectors.
[0007]
Therefore, when this file system is implemented in an environment with low performance, if the skip size is large, it takes a long processing time to access necessary parts.
[0008]
In the case of a file system that cannot access the previous position, it takes a long processing time to skip data from the beginning of the file to the required position.
[0009]
In addition, in order to improve the processing speed by improving the file system, it is necessary to construct a new file system, so it is necessary to make a change to the existing operating system, and in some cases, it is impossible to make the change. .
[0010]
The present invention has been made to solve the above problems, and an object of the present invention is to provide a file management method capable of accessing a huge file at a high speed, and an information processing apparatus using the same. is there. Further, an object of the present invention includes providing a file management program for realizing the information processing apparatus and a computer-readable recording medium on which the file management program is recorded.
[0011]
[Means for Solving the Problems]
In order to solve the above problem, an information processing apparatus according to the present invention uses a file system that performs sequential file access to a storage device that divides one combined file into a plurality of divided files and stores the divided files. File access execution means for accessing a divided file; file access command receiving means for receiving a file access command from an application together with access position information specifying a position to be accessed by a position in the connection file; Based on the position in the file and the size of each divided file, the divided file including the position indicated by the access position information and the access position in the divided file are specified, and the file access executing means accesses the divided file. Let It is characterized in that it comprises a index management means.
[0012]
Further, the file management method of the present invention is a file management method used for a storage device that divides one combined file into a plurality of divided files and stores the divided file, wherein an application specifies a location to be accessed by a position in the combined file. A file access command receiving step of receiving a file access command together with the obtained access position information, a position of each divided file in the combined file, and a divided file including a position indicated by the access position information based on the size of each divided file; A divided file specifying step for specifying an access position in the divided file, and a file for accessing the access position of the divided file specified in the divided file specifying step by using a file system for performing sequential file access It is characterized in that it comprises a access execution step.
[0013]
By dividing a file (combined file) in advance by the above configuration and method, even if a file system for performing sequential file access is used, the size of the skipped file is the largest of the divided file size. In other words, by using a divided file, it is possible to reach the access position designated by the application with the minimum necessary disk access, and to speed up the access. Therefore, there is no need to enhance the function of the file system.
[0014]
Also, the application receives access position information in which the position to be accessed is specified by the position in the combined file, based on the position of each divided file in the combined file and the size (index information) of each divided file. To determine. The index information may be information that can reproduce the position of each divided file FD in the combined file, and may be, for example, the order of division or the number of blocks on the storage device.
[0015]
Therefore, it is possible to realize an interface capable of accessing the divided file by the same access operation as accessing the single combined file for the application. That is, the application does not need to manage the divided files.
[0016]
Therefore, it is possible to access a huge file such as a dictionary file at high speed. Further, even if the capacity of the data file used by the application becomes large, it is not necessary to change the format of the file access instruction of the file system and / or the application, so that the existing file system and application can be used.
[0017]
As described above, the above configuration and method are particularly suitable for an information processing apparatus in which an application that can access only one file at a time randomly accesses a huge file using a file system that performs sequential file access. is there.
[0018]
Further, in the information processing apparatus according to the present invention, the index management unit may be configured such that the data requested to be accessed by the application is continuous data in the combined file and is stored in a distributed manner in a plurality of divided files. It is characterized in that the file access executing means accesses the plurality of divided files while sequentially switching the divided files to be accessed.
[0019]
According to the above configuration, furthermore, by switching the divided file to be referred to at a part where the continuous data is divided, even when the required continuous data exists over two or more divided files, the continuous Can be treated as data. Therefore, a plurality of divided files can be accessed as if they were one file.
[0020]
Further, the information processing apparatus according to the present invention is characterized in that the index file storing the index information is stored in a storage device storing the divided file.
[0021]
With the above configuration, index information can be obtained by reading an index file. Further, since the divided files can be managed by the file names specified in the index file, the divided file names can be set flexibly. Further, since the index file is stored in the storage device together with the divided file, the handling is simple.
[0022]
Further, in the information processing apparatus according to the present invention, when the index file is designated as a file to be accessed from an application, the index management unit changes the file to be accessed to a divided file managed by the index file. It is characterized by things.
[0023]
With the above configuration, the application can access the divided file by designating the index file as the file to be accessed. That is, the application can access a plurality of divided files as if they were one file. Also, since the index file actually exists in the storage device, it is easier to handle than specifying a combined file before division that does not actually exist.
[0024]
Furthermore, the information processing apparatus of the present invention further includes a file dividing unit that divides the combined file to generate the plurality of divided files, wherein the index management unit determines a position of each divided file in the combined file; An index file storing the size of the divided file is generated and stored in the storage device, and the file access execution means stores each divided file in the storage device.
[0025]
According to the above configuration, a divided file can be further generated from the combined file, and the divided file and the index file can be stored as a set in the storage device. That is, the file can be configured in the storage device so that the divided file can be accessed using the index file.
[0026]
Furthermore, the information processing apparatus of the present invention includes a file combining unit that combines a plurality of divided files stored in the storage device to generate a combined file based on the index file managed by the index management unit. It is characterized by.
[0027]
According to the above configuration, it is possible to access a combined file having the same contents as the divided file even in an apparatus that does not have a function of accessing the divided file using the index file. Therefore, the divided file can be taken out as a combined file, so that compatibility with other devices can be maintained. For example, in a high-speed operating system, there is no need to divide a file, so that it is possible to return to a single file to enhance convenience, while maintaining compatibility. As described above, since the divided file can be restored by the user's operation, it is possible to set a file access method according to the user's operating environment.
[0028]
Further, a file management program of the present invention is a computer program that causes a computer to function as each unit of the information processing apparatus.
[0029]
With the above configuration, the information processing device can be realized by realizing each unit of the information processing device with a computer.
[0030]
In addition, a computer-readable recording medium storing the file management program of the present invention is a computer-readable recording medium that stores a file management program that causes the computer to realize each unit of the information processing apparatus. It is a recording medium.
[0031]
With the above configuration, the information processing device can be realized on a computer by the file management program read from the recording medium.
[0032]
BEST MODE FOR CARRYING OUT THE INVENTION
One embodiment of the present invention will be described below with reference to FIGS.
[0033]
FIG. 1 is a functional block diagram schematically showing a configuration of an information processing apparatus 1 according to the present embodiment. As shown in FIG. 1, the information processing apparatus 1 includes at least an application 10, a file management unit 20, a file system 30, and a storage device 40.
[0034]
The information processing device 1 is a device that executes an application that needs to frequently access an arbitrary position of a huge file, for example, a portable electronic dictionary device. When the information processing device 1 is an electronic dictionary device, the divided file FD stored in the storage device 40 is a dictionary file, and the application 10 is application software for performing a dictionary search.
[0035]
The storage device 40 stores a plurality of divided files FD and an index file FI in which index information for managing the divided files FD is described.
[0036]
Here, the operating system of the information processing apparatus 1 has a limited function of the file system 30. Specifically, the file system 30 can perform only sequential file access that sequentially accesses from the beginning of the file. That is, the file system 30 does not have a function of accessing an arbitrary position of a file at a high speed, such as moving the file forward.
[0037]
The application 10 can access only one file at a time, and does not have a function to access a plurality of files at the same time.
[0038]
The file management unit 20 is middleware provided between the application 10 having such limited functions and the file system 30. That is, the file management unit 20 functions as an interface that mediates file access to the storage device 40 upon receiving a file access command from the application 10. More specifically, the file management unit 20 sends the application 10 a divided file FD divided and stored in the storage device 40 into a single undivided combined file FC (actually stored in the storage device 40). Provides an environment that can be accessed using a file access instruction for accessing a virtual combination file FCim) that does not exist in the file. As described below, the file management unit 20 controls access to the divided file FD based on the index file FI.
[0039]
Next, the index file FI and the divided file FD stored in the storage device 40 will be described with reference to FIGS. FIG. 2 is an explanatory diagram showing a specific example of the combined file FC, the divided file FD, and the index file FI. FIG. 3 is an explanatory diagram showing the data structure of the index file FI. FIG. 4 is an explanatory diagram showing a specific example of the index file FI.
[0040]
As shown in FIG. 2, the divided file FD is obtained by dividing the originally one combined file FC into a plurality. Note that the size of each divided file FD is arbitrary, and it is not necessary that the combined file FC is equally divided (FIG. 4).
[0041]
As shown in FIGS. 3 and 4, the index file FI describes index information such as the file name, order, and size of the divided files FD in association with each divided file FD. In the index file FI, a header indicating a divided file management index is described at the head of the file.
[0042]
In the specific example shown in FIG. 2, the file "ABCD.DAT" (combined file FC) divided into 64 parts of an arbitrary size is converted into files "ABCD.000" to "ABCD.063" (partitioned files FD (FD1 to FD64). )). The index file "ABCD.IDX" (index file FI) manages the divided files in the order of division.
[0043]
As shown in FIG. 4, a header such as a version number indicating that this file is an index file FI that manages the index information of the divided file FD is included in the first line of the index file “ABCD.IDX”. Is described. In the second and subsequent lines, the file names and file sizes of the divided files FD1 to FD64 are described in the order of division. Note that the index file FI can be described in any format, and may be described in, for example, text or binary.
[0044]
As shown in FIG. 1, the file management unit 20 includes a file access command receiving unit 21, an index management unit 22, and a file access execution unit 23. The file division / combination unit 24 will be described later.
[0045]
The file access command receiving unit (file access command receiving means) 21 receives a file access command from the application 10 together with access position information specifying a position to be accessed by a position in the combined file FC.
[0046]
The index management unit (index management means) 22 manages the position of each divided file FD in the combined file FC and the size of each divided file FD as index information, and based on this index information, controls access to the divided file FD. Control. The index management unit 22 acquires the index information by reading the index file FI from the storage device 40.
[0047]
When starting access to the divided file FD, the index management unit 22 reads information of the index file FI and checks consistency with each divided file FD stored in the storage device 40. Specifically, the index management unit 22 checks whether all the divided files FD described in the index file FI exist, whether the file size of each divided file FD matches the description, and the like. Normal access is possible.
[0048]
Then, the index management unit 22 specifies the divided file FD including the position indicated by the access position information and the access position in the divided file FD based on the index information, and gives the file access execution unit 23 an access to the divided file FD. Is executed.
[0049]
Further, when the data requested to be accessed by the application 10 is continuous data in the combined file FC and is stored in a plurality of divided files FD in a distributed manner, the index management unit 22 Then, the user accesses the plurality of divided files FD while sequentially switching the divided files FD to be accessed.
[0050]
When the index file FI is specified as a file to be accessed from the application 10, the index management unit 22 changes the file to be accessed to the divided file FD managed by the index file FI. The file management unit 20 determines that the access is to the index file FI by detecting the header (FIGS. 3 and 4) of the index file FI in the read file.
[0051]
The file access execution unit (file access execution unit) 23 uses a file system 30 that performs sequential file access to a storage device 40 that divides one combined file FC into a plurality of divided files FD and stores the divided files. Access the divided file FD.
[0052]
Further, as shown in FIG. 1, the file management unit 20 includes a file division / combination unit 24. FIG. 11 is an explanatory diagram showing the relationship between the combined file FC and the divided file FD.
[0053]
First, the file dividing / combining unit (file dividing unit) 24 divides the combined file FC to generate a plurality of divided files FD. At this time, the index management unit 22 generates an index file FI that stores the position and size of each divided file FD in the combined file FC and stores the index file FI in the storage device 40. Further, the file access execution unit 23 stores each divided file FD in the storage device 40. The combined file FC is supplied from the external storage device 2 to the file dividing / combining unit 24, for example. Thus, the divided file FD can be generated from the combined file FC, and the divided file FD and the index file FI can be stored in the storage device 40 as a set. That is, the file can be configured in the storage device 40 so as to be usable via the file management unit 20.
[0054]
Second, the file dividing / combining unit (file combining unit) 24 combines a plurality of divided files FD stored in the storage device 40 based on the index file FI managed by the index managing unit 22 to create a combined file FC. Generate The combined file FC generated by the file division / combination unit 24 is stored in, for example, the external storage device 2. As a result, even a device that does not include the file management unit 20 can access a file having the same content as the divided file FC (combined file FC). That is, since the divided file FD can be taken out as the combined file FC, compatibility with other devices can be maintained.
[0055]
Next, the processing of the file management unit 20 will be described with reference to FIGS.
[0056]
(1) Split file open processing
FIG. 5 is a flowchart showing a file open process.
[0057]
First, when the file access command receiving unit 21 receives a file open command from the application 10 (file access command receiving step), it determines whether the specified file to be opened is the index file FI (SO1). If the file to be opened is not the index file FI (NO in SO1), the file access execution unit 23 performs a normal file open process (SO5).
[0058]
On the other hand, if the file to be opened is the index file FI (YES in SO1), the index management unit 22 reads the index file FI and sets the index information of the divided file FD in the work (SO2). Next, after the index management unit 22 checks the validity of the divided file FD described in the index file FI (SO3), the file access execution unit 23 transmits the first file (divided file-1) FD1 of the divided file FD. (SO4; divided file identification step, file access execution step). Thus, the preparation for accessing the divided file FD is completed.
[0059]
(2) Split file skip processing
FIG. 6 is a follow chart showing a file skip process.
[0060]
First, when receiving the file skip command from the application 10 (file access command receiving step), the file access command receiving unit 21 determines whether the specified file to be accessed is the divided file FD (SS1). If the file is not the divided file FD but a normal file (NO in SS1), the index management unit 22 does not perform the processing, and the file access execution unit 23 performs the normal file skip processing (SS9).
[0061]
On the other hand, when the file to be accessed is the divided file FD (YES in SS1), the index management unit 22 determines the index based on the index information for the given skip destination and the index information of the divided file FD1 read at the time of opening. The skip size from the beginning of the divided file FD to the skip position is calculated (SS2). Next, the index management unit 22 compares the skip size with the size of the first file FD1 of the divided file (SS3). If the skip size is larger than the size of the compared file FD1 (NO in SS4), the size of the compared divided file FD1 is subtracted from the skip size, and this is set as a new skip size (SS7). Steps SS4 and SS7 are repeated until the divided files FD (FD2 to FDn) to be compared are smaller than the skip size while being changed according to the index file FI. When the skip size finally becomes smaller than the size of the divided file FD to be compared (YES in SS4), the position skipped by the skip size from the beginning of the divided file FD at this time becomes the target skip position. Steps SS2 to SS4 and SS7 correspond to a divided file specifying step.
[0062]
Next, the file access execution unit 23 determines whether or not the currently opened file is the divided file FD obtained by repeating Step SS4 and Step SS7 (SS5), and if different (NO in SS5), The current file is closed, and the obtained divided file FD is opened (SS8). Finally, the file access execution unit 23 executes a skip process on the currently opened divided file FD based on the skip size (SS6). Steps SS6 and SS8 correspond to a file access execution step.
[0063]
(3) Split file read processing
FIG. 7 is a flowchart showing a file reading process.
[0064]
First, when the file access command receiving unit 21 receives a file read command from the application 10 (file access command receiving step), it determines whether the specified file to be accessed is the divided file FD (SR1). If the file to be accessed is not a divided file FD but a normal file (NO in SR1), the index management unit 22 does not perform the process, and the file access execution unit 23 performs the normal file reading process (SR5).
[0065]
On the other hand, if the file to be accessed is the divided file FD (YES in SR1), the file access execution unit 23 reads a required size or a readable size from the currently opened divided file FD (SR2). . If the file access execution unit 23 determines that reading of the required size has not been completed (NO in SR3), the currently opened divided file is closed and the next divided file is opened (SR4; (A divided file specifying step, a file access executing step), and step SR2 is executed again. When the file access execution unit 23 repeats steps SR2 to SR4 to read the required size (YES in SR3), the reading from the divided file FD is completed.
[0066]
(4) Split file writing process
FIG. 8 and FIG. 9 are flowcharts showing a writing process to a file.
[0067]
First, as shown in FIG. 8, when the file access command receiving unit 21 receives a file write command from the application 10 (file access command receiving step), it is determined whether the specified file to be accessed is the divided file FD. A judgment is made (SW1). If the file to be accessed is not a divided file but a normal file (NO in SW1), the index management unit 22 does not perform any processing, and the file access execution unit 23 performs normal file writing processing (SW5).
[0068]
On the other hand, when the file to be accessed is the divided file FD (YES in SW1), the file access execution unit 23 writes the required size or the writeable size to the currently opened file (SW2). Then, the file access execution unit 23 determines whether the writing for the required size has been completed (SW3), and if the writing has not been completed (NO in SW3), executes the close / open processing to perform the writing processing again. (SW4; divided file identification step, file access execution step).
[0069]
Here, as shown in FIG. 9, in the close / open processing (SW4), the file access execution unit 23 checks whether or not a divided file next to the currently opened file exists (SW41). If not (NO in SW41), the currently open file is closed, and a file to be written next is newly created (SW43). At this time, the index management unit 22 sets the addition of the file to the work index file FI (divided file management work) (SW44). On the other hand, if there is a file next to the currently opened file (YES in SW41), the file access execution unit 23 closes the current file and opens the next file (SW42).
[0070]
Next, as shown in FIG. 8, after the completion of the close / open processing (SW4), steps SW2 to SW4 are repeated, and if the file access execution unit 23 writes the required size (YES in SW3), the file access to the divided file FD is performed. Writing is completed.
[0071]
(5) Split file close processing
FIG. 10 is a flowchart showing a file closing process.
[0072]
First, when receiving the file close command from the application 10 (file access command receiving step), the file access command receiving unit 21 determines whether the file to be closed is the divided file FD (SC1). When the file to be closed is not the divided file FD (NO in SC1), the index management unit 22 does not perform the process, and the file access execution unit 23 performs the normal file close process (SC5).
[0073]
On the other hand, if the file to be closed is a divided file (YES in SC1), the index management unit 22 determines whether there is a change in the index information in the writing process to the divided file FD (SC2). If YES in SC2, the index file FI is updated (SC3). Finally, the file access execution unit 23 performs a normal closing process of the currently opened divided file FD, and the index management unit 22 performs a work initialization process (SC4).
[0074]
As described above, in the information processing apparatus 1 in which the application 10 that can access only one file at a time randomly accesses a huge file using the file system 30 that performs sequential file access, the file management unit 20 , And manages the divided file FD divided into a plurality by using the index file FI.
[0075]
Thus, the file management unit 20 enables high-speed access to a huge file such as a dictionary file, and also enables the application 10 to simulate a single file. Therefore, it is not necessary for the application 10 to manage the divided file FD, and it is not necessary to enhance the function of the file system 30. Therefore, even if the capacity of the data file used by the application 10 becomes large, it is not necessary to change the format of the file access instruction of the file system 30 and / or the application 10, and the existing file system 30 and the application 10 can be used. .
[0076]
The information processing apparatus 1, that is, the file management unit 20 is suitable for a portable electronic dictionary device with limited hardware and software functions, but can be applied to other applications. Further, the present invention can be applied to a high-performance computer such as a desktop computer, and a similar effect can be obtained.
[0077]
Further, in the present embodiment, the case where the application 10, the file management unit 20, the file system 30, and the storage device 40 are provided in one information processing device 1 has been described, but these are configured in separate devices. May be communicably connected to each other.
[0078]
Further, in the present embodiment, the case where the file management unit 20 is provided separately from the application 10 and the file system 30 has been described, but the file management unit 20 may be provided integrally with the application 10 or the file system 30.
[0079]
Further, in the present embodiment, the case where one combined file FC is divided and the index file FI is stored together with the divided file FD in the storage device 40 is described. Each divided file FD may be stored. In this case, the index file FI may be created for each combined file FC, or the index information of the divided files FD corresponding to the plurality of combined files FC may be stored in one index file FI.
[0080]
Note that the present embodiment does not limit the scope of the present invention, and various changes can be made within the scope of the present invention. For example, the present embodiment can be configured as follows.
[0081]
A file management method according to the present invention, in an information processing apparatus capable of managing files using a file system, divides one file to be recorded into two or more files and records the divided files, When reading the position, by controlling the order and size of the divided and recorded files, determine the divided file containing the specific position, find the specific part in the divided file, and select any part It may be a method of speeding up access to.
[0082]
Thus, by dividing the file in advance, it is possible to manage the divided file in an application operating on the operating system. In addition, by dividing a file, the size of the skipped file is the largest of the divided file size. In other words, by making a divided file, it is possible to reach the position of the skip destination with the minimum necessary disk access, and it is possible to speed up the access.
[0083]
Further, the file management method described above records an index file describing the divided file name together with the divided file, and when reading any specific position of the file, the order of the divided and recorded files from the index file is read. May be managed.
[0084]
Thus, the divided file names can be managed by the file names specified in the index file. Therefore, by using the index file, the divided file names can be set flexibly.
[0085]
Further, the file management method described above manages the order and size of the files divided and recorded from the index file when reading any specific position of the file by describing the file name and the file size in the index file. It may be a method.
[0086]
Thus, the divided file names can be managed by the file names specified in the index file. Therefore, by using the index file, the divided file names can be set flexibly.
[0087]
Further, in the file management method, the file name specified when opening the file may be the index file.
[0088]
Thus, when the file name to be opened is the index file name, the divided file can be accessed as if it were one file.
[0089]
Further, in the above file management method, when two or more continuous data at a specific position of a required file exist in two or more files, a file to be referred to is switched in a part where data of the file is divided. Thus, a method of handling as continuous data may be used.
[0090]
Thus, the divided files can be accessed as if they were one file.
[0091]
Further, the file management method may be a method that can handle a divided file without changing a file read command of an application using a file system.
[0092]
Thus, the above-described file management method can be implemented on the operating system level or on the virtual operating system on the application. Therefore, it is not necessary to change the file operation at the application level.
[0093]
Further, the above file management method implements a program for returning a divided file to one file before division, and executes the program for returning to a file before division even in an apparatus having no function of accessing the divided file. By doing so, a method that allows access to the file before division may be used.
[0094]
As a result, the divided file can be restored by the user's operation, so that it is possible to set a file access method according to the user's operating environment. That is, since it is not necessary to divide a high-speed operating system, it is possible to return to one file to enhance the convenience and maintain the compatibility.
[0095]
Further, the information processing apparatus of the present invention may be an information processing apparatus in which a file system performs sequential file access, and may perform the above-described file management method.
[0096]
Lastly, the information processing apparatus 1 includes a CPU (central processing unit) for executing a command of a program for realizing the provided function, a ROM (read only memory) storing boot logic, and a RAM (random access) for expanding the program. memory, a storage device (including the storage device 40) for storing the programs and various databases, input devices such as a keyboard and a mouse, and output devices such as a monitor, a speaker, and a printer are connected by an internal bus. . The storage device 40 and the external storage device 2 are arbitrary storage devices, for example, a hard disk, a floppy (registered trademark) disk, a medium such as a CD-ROM, an optical disk, a magneto-optical disk, an MD, and a ROM / RAM memory. Etc. are available.
[0097]
An object of the present invention is to provide a computer-readable recording medium storing a program code (executable format program, intermediate code program, source program) of a file management program which is software for realizing the above-described functions. And a computer (or CPU, MPU, or DSP) of the system or apparatus reads out and executes the program code recorded on the recording medium. In this case, the program code itself read from the recording medium realizes the above-described function, and the recording medium on which the program code is recorded constitutes the present invention. Specifically, the file management unit 20 included in the information processing device 1 executes a predetermined program stored in a memory (not illustrated) of the information processing device 1 by executing a predetermined program by a microprocessor (not illustrated) or the like. Is achieved.
[0098]
The recording medium for supplying the program code can be configured to be separable from the system or the device. Further, the recording medium may be a medium that fixedly carries the program code so that the program code can be supplied. Even if the recording medium is mounted on a system or an apparatus so that a computer can directly read the recorded program code, the recording medium may be connected to a system or apparatus as an external storage device via a program reading apparatus connected to the system or the apparatus. It may be mounted so that it can be read.
[0099]
For example, the recording medium may be a tape system such as a magnetic tape or a cassette tape, a magnetic disk such as a floppy (registered trademark) disk / hard disk, or a disk including an optical disk such as a CD-ROM / MO / MD / DVD / CD-R. System, a card system such as an IC card (including a memory card) / optical card, or a semiconductor memory system such as a mask ROM / EPROM / EEPROM / flash ROM.
[0100]
Further, the program code may be recorded so that the computer can read out from the recording medium and directly execute the program code, or can be read out from the main storage and executed by the computer after being transferred from the recording medium to the program storage area of the main storage. May be recorded as follows.
[0101]
Further, the system or device may be configured to be connectable to a communication network, and the program code may be supplied via the communication network. The communication network is not particularly limited. Specifically, the Internet, an intranet, an extranet, a LAN, an ISDN, a VAN, a CATV communication network, a virtual private network, a telephone network, and a mobile communication A network, a satellite communication network, etc. can be used. The transmission medium constituting the communication network is not particularly limited. Specifically, even if the transmission medium is a wire such as IEEE 1394, USB, power line carrier, cable TV line, telephone line, or ADSL line, an infrared ray such as IrDA or a remote control is used. , Bluetooth, 802.11 wireless, HDR, mobile phone network, satellite line, digital terrestrial network, and the like.
[0102]
The program for reading the program code from the recording medium and storing the program code in the main memory, and the program for downloading the program code from the communication network are stored in advance in a system or an apparatus so as to be executable by a computer. I do.
[0103]
The above-described functions are realized not only by executing the above-described program code read by the computer, but also executing a part or all of the actual processing by the OS or the like running on the computer based on the instruction of the program code. It is also realized by performing.
[0104]
Further, the above-described function is realized by writing the program code read from the recording medium into a memory provided in a function expansion board mounted on a computer or a function expansion unit connected to the computer, and then executing the program code. Is also realized by a CPU or the like provided in the function expansion board or function expansion unit performing part or all of the actual processing based on the instruction.
[0105]
【The invention's effect】
As described above, the information processing apparatus of the present invention accesses each divided file using a file system that performs sequential file access to a storage device that divides one combined file into a plurality of divided files and stores the divided file. File access execution means, file access instruction receiving means for receiving a file access instruction together with access position information specifying a position to be accessed from the application by the position in the connection file, and a position of each divided file in the connection file. And an index that specifies the divided file including the position indicated by the access position information and the access position in the divided file based on the size of each divided file, and causes the file access execution unit to execute the access to the divided file. A management unit, a configuration equipped with.
[0106]
Further, the file management method of the present invention is a file management method used for a storage device that divides one combined file into a plurality of divided files and stores the divided file, wherein an application specifies a location to be accessed by a position in the combined file. A file access command receiving step of receiving a file access command together with the obtained access position information, a position of each divided file in the combined file, and a divided file including a position indicated by the access position information based on the size of each divided file; A divided file specifying step for specifying an access position in the divided file, and a file for accessing the access position of the divided file specified in the divided file specifying step by using a file system for performing sequential file access And access execution step, the method comprising.
[0107]
Therefore, by using a divided file, it is possible to reach the access position specified by the application with the minimum necessary disk access, and to speed up the access. Therefore, there is no need to enhance the function of the file system. In addition, an interface that can access the divided file can be realized by the same access operation as accessing a single combined file for the application. Therefore, the application does not need to manage the divided files.
[0108]
Therefore, there is an effect that a huge file such as a dictionary file can be accessed at high speed. Further, even if the capacity of the data file used by the application becomes large, there is no need to change the format of the file access command of the file system and / or the application, so that the existing file system and application can be used.
[0109]
Further, in the information processing apparatus according to the present invention, the index management unit may be configured such that the data requested to be accessed by the application is continuous data in the combined file and is stored in a distributed manner in a plurality of divided files. The file access execution means accesses the plurality of divided files while sequentially switching the divided files to be accessed.
[0110]
Therefore, even when required continuous data exists over two or more divided files, it can be handled as continuous data. Therefore, there is an effect that a plurality of divided files can be accessed as if they were one file.
[0111]
Further, the information processing apparatus of the present invention has a configuration in which an index file storing the index information is stored in a storage device storing the divided file.
[0112]
Therefore, it is possible to obtain the index information by reading the index file. Further, since the divided file can be managed by the file name specified in the index file, it is possible to flexibly set the divided file name. Further, since the index file is stored in the storage device together with the divided file, there is an effect that the handling is simple.
[0113]
Further, in the information processing apparatus according to the present invention, when the index file is designated as a file to be accessed from an application, the index management unit changes the file to be accessed to a divided file managed by the index file. Things.
[0114]
Therefore, there is an effect that the application can access a plurality of divided files as if they were one file. In addition, since the index file actually exists in the storage device, there is an effect that the index file is easier to handle than specifying a combined file before division that does not actually exist.
[0115]
Furthermore, the information processing apparatus of the present invention further includes a file dividing unit that divides the combined file to generate the plurality of divided files, wherein the index management unit determines a position of each divided file in the combined file; An index file storing the size of the divided file is generated and stored in the storage device, and the file access execution means stores each divided file in the storage device.
[0116]
Therefore, there is an effect that the file can be configured in the storage device so that the divided file can be accessed using the index file.
[0117]
Further, the information processing apparatus of the present invention includes a file combining unit that combines a plurality of divided files stored in the storage device to generate a combined file based on the index file managed by the index management unit. It is.
[0118]
Therefore, since the divided file can be further taken out as a combined file, it is possible to maintain the compatibility with other devices.
[0119]
Further, a file management program of the present invention is a computer program that causes a computer to function as each unit of the information processing apparatus.
[0120]
Therefore, there is an effect that the information processing apparatus can be realized by realizing each unit of the information processing apparatus by a computer.
[0121]
In addition, a computer-readable recording medium storing the file management program of the present invention is a computer-readable recording medium that stores a file management program that causes the computer to realize each unit of the information processing apparatus. It is a recording medium.
[0122]
Therefore, there is an effect that the information processing apparatus can be realized on a computer by the file management program read from the recording medium.
[Brief description of the drawings]
FIG. 1 is a functional block diagram schematically illustrating a configuration of an information processing apparatus according to an embodiment of the present invention.
FIG. 2 is an explanatory diagram showing a specific example of a combined file, a divided file, and an index file in the information processing apparatus shown in FIG.
FIG. 3 is an explanatory diagram illustrating a data structure of an index file in the information processing apparatus illustrated in FIG. 1;
FIG. 4 is an explanatory diagram showing a specific example of an index file in the information processing device shown in FIG. 1;
FIG. 5 is a flowchart showing a file open process in the information processing apparatus shown in FIG. 1;
FIG. 6 is a flowchart showing a file skip process in the information processing apparatus shown in FIG. 1;
FIG. 7 is a flowchart showing a file reading process in the information processing apparatus shown in FIG. 1;
FIG. 8 is a flowchart illustrating a file writing process in the information processing apparatus illustrated in FIG. 1;
FIG. 9 is a flowchart showing details of a close / open process of the file write process shown in FIG. 8;
FIG. 10 is a flowchart showing a file closing process in the information processing apparatus shown in FIG. 1;
11 is an explanatory diagram illustrating a relationship between a combined file and a divided file in the information processing device illustrated in FIG. 1;
[Explanation of symbols]
1 Information processing device
10 Applications
21 File Access Instruction Receiving Unit (File Access Instruction Receiving Means)
22 Index management unit (index management means)
23 File access execution unit (file access execution means)
24 File division / combination unit (file division means, file combination means)
30 File System
40 storage devices
FC connection file
FD (FD1 to FDn) Split file
FI index file
SO1, SS1, SR1, SW1, SC1 File access command receiving step
SO4, SS2 to SS4, SS7, SR4, SW4 Split file identification step
SO4, SS6, SS8, SR4, SW4 File access execution step

Claims (9)

File access execution means for accessing each divided file by using a file system for performing sequential file access to a storage device which divides one combined file into a plurality of divided files and stores the divided file;
File access command receiving means for receiving a file access command from an application together with access position information specifying a position to be accessed by the position in the combined file;
Based on the position of each divided file in the combined file and the size of each divided file, the divided file including the position indicated by the access position information and the access position in the divided file are specified, and the file access execution means specifies the divided file. An information processing apparatus comprising: index management means for executing access to a file. When the data requested to be accessed by the application is continuous data in the combined file and is stored in a distributed manner in a plurality of divided files, the index managing means may access the divided file to be accessed by the file access executing means. 2. The information processing apparatus according to claim 1, wherein the plurality of divided files are accessed while the files are sequentially switched. The information processing apparatus according to claim 1, wherein the index file storing the index information is stored in a storage device storing the divided file. The said index management means, when the index file is designated as a file to be accessed from an application, changes the file to be accessed to a divided file managed by the index file. 4. The information processing device according to 3. File splitting means for splitting the combined file to generate the plurality of split files,
The index management means generates an index file storing a position of each divided file in the combined file and a size of each divided file, and stores the generated index file in the storage device.
4. The information processing apparatus according to claim 3, wherein said file access execution means stores each divided file in said storage device. 4. The apparatus according to claim 3, further comprising file combining means for combining a plurality of divided files stored in the storage device to generate a combined file based on the index file managed by the index managing means. Information processing device. A file management method used for a storage device that divides one combined file into a plurality of divided files and stores the divided files,
A file access command receiving step of receiving a file access command from the application together with access position information specifying a position to be accessed by a position in the combined file;
Based on the position of each divided file in the combined file and the size of each divided file, a divided file including a position indicated by the access position information and a divided file specifying step of specifying an access position in the divided file;
A file access execution step of accessing the access position of the divided file specified in the divided file specifying step using a file system for performing sequential file access. A file management program for operating the information processing apparatus according to claim 1, wherein the program causes a computer to function as each of the above means. A computer-readable recording medium recording the file management program according to claim 8.

Images