JP2017027203A - Storage medium control device, storage medium control program, and storage medium control method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce occurrence of mismatching of data because of stopping of power supply during update of data in a storage medium from which data are read and to which data are written in storage area units composed of a plurality of storage areas.SOLUTION: A storage control device for controlling read/write of data in storage area units from and to a storage medium composed of a plurality of storage areas includes a data update part for updating data stored in the storage medium. The data update part update data by reading the data from the storage area based on data management information as information for reading the data from the storage area, stores the updated data in a storage area differing from the storage area for storing data before update, stores the updated data in another storage area, and updates the data management information to data management information for reading the updated data from another storage area.SELECTED DRAWING: Figure 10

Description

  The present invention relates to a storage medium control device, a storage medium control program, and a storage medium control method.

  In recent years, NAND flash memories are often mounted on various information processing apparatuses such as image processing apparatuses and tablet terminals configured as MFPs (Multi Function Peripherals).

  As a method for managing file data read and written in such a NAND flash memory (hereinafter referred to as “file system”), a simple file system with light processing corresponding to wear leveling has been proposed ( For example, see Patent Document 1).

  If the power supply is interrupted due to a power failure or the like while updating data to be read / written in the NAND flash memory, data inconsistency occurs, such as incomplete data update or data corruption. There is a case. The file system disclosed in Patent Document 1 does not support the avoidance of data inconsistency caused by the power supply being stopped during the update of data read / written in the NAND flash memory.

  Such a problem may occur not only in the NAND flash memory, but also in other storage media that are configured by a plurality of storage areas and in which data is read and written in units of storage areas.

  The present invention has been made in order to solve such a problem, and the power supply is stopped during the update of data in a storage medium that is composed of a plurality of storage areas and in which data is read and written in units of storage areas. The objective is to reduce the occurrence of data inconsistencies.

  In order to solve the above-described problem, one aspect of the present invention is a storage medium control apparatus that controls reading and writing of data in units of storage areas with respect to a storage medium including a plurality of storage areas. A data update unit that updates the data stored in the storage area, and the data update unit reads the data from the storage area based on data management information that is information for reading the data from the storage area The updated data is stored in the storage area different from the storage area in which the pre-update data is stored, and the updated data is stored in the separate storage area. The data management information is updated to data management information for reading the updated data from the another storage area.

  According to the present invention, it is possible to reduce the occurrence of data inconsistency due to the stop of power supply during the update of data in a storage medium composed of a plurality of storage areas in which data is read and written in units of storage areas.

1 is a block diagram illustrating a hardware configuration of an image processing apparatus according to an embodiment of the present invention. 1 is a block diagram illustrating a functional configuration of an image processing apparatus according to an embodiment of the present invention. It is a conceptual diagram which illustrates the structure of NAND which concerns on embodiment of this invention. It is a figure which illustrates the file system of NAND which concerns on embodiment of this invention. It is a figure which illustrates the content of the partition information which concerns on embodiment of this invention. It is a figure which illustrates the content of the information contained in the file metadata which concerns on embodiment of this invention. It is a block diagram which illustrates functional composition about control of NAND of a main control part concerning an embodiment of the present invention. It is a figure which illustrates the update aspect of the data by the data update part which concerns on embodiment of this invention. It is a figure which illustrates the update aspect of the data by the data update part which concerns on embodiment of this invention. It is a figure which illustrates the update aspect of the data by the data update part which concerns on embodiment of this invention. It is a figure which illustrates the update aspect of the data by the data update part which concerns on embodiment of this invention. It is a figure which illustrates the update aspect of the data by the data update part which concerns on embodiment of this invention. It is a figure which illustrates the update aspect of the data by the data update part which concerns on embodiment of this invention. It is a figure which illustrates the update aspect of the data by the data update part which concerns on embodiment of this invention. It is a flowchart which illustrates the operation | movement of the data deletion process by the data deletion part which concerns on embodiment of this invention. It is a flowchart which illustrates the operation | movement of the authentication process by the authentication process part which concerns on embodiment of this invention. It is a flowchart which illustrates the operation | movement of the authentication process by the authentication process part which concerns on embodiment of this invention.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In this embodiment, an image processing apparatus as an MFP (Multi Function Peripheral) that can be used as a printer, a facsimile, a scanner, and a copier by providing an imaging function, an image forming function, a communication function, and the like is taken as an example. explain.

  FIG. 1 illustrates a hardware configuration of an image processing apparatus 1 according to the present embodiment. As shown in FIG. 1, the image processing apparatus 1 according to the present embodiment includes the same configuration as a general server, a PC (Personal Computer), or the like.

  That is, the image processing apparatus 1 according to the present embodiment includes a CPU (Central Processing Unit) 10, a RAM (Random Access Memory) 20, a ROM (Read Only Memory) 30, an HDD (Hard Disk Drive) 40, an I / F 50, and a NAND 90. Are connected via a bus 80. Further, an LCD (Liquid Crystal Display) 60 and an operation unit 70 are connected to the I / F 50. In addition, the image processing apparatus 1 includes a dedicated device that executes image formation output and scanning.

  The CPU 10 is a calculation unit and controls the operation of the entire image processing apparatus 1. The RAM 20 is a volatile storage medium capable of reading and writing information at high speed, and is used as a work area when the CPU 10 processes information. The ROM 30 is a read-only nonvolatile storage medium and stores a program such as firmware.

  The HDD 40 is a non-volatile storage medium that can read and write information, and stores an OS (Operating System), various control programs, application programs, and the like. In addition to the HDD, a semiconductor storage device such as an SSD (Solid State Drive) may be used.

  The NAND 90 is a NAND flash memory, and is a non-volatile storage medium capable of reading and writing information faster than the RAM 20 and the HDD 40. One of the gist according to the present embodiment is data read / write control with respect to the NAND 90. Details will be described later.

  The I / F 50 connects and controls the bus 80 and various hardware and networks. The LCD 60 is a visual user interface for the user to check the state of the image processing apparatus 1. The operation unit 70 is a user interface for a user to input information to the image processing apparatus 1 such as a keyboard, a mouse, various hard buttons, and a touch panel.

  In such a hardware configuration, a program stored in a storage medium such as the ROM 30, the HDD 40, or an optical disk (not shown) is read into the RAM 20, and the software control unit is configured by the CPU 10 performing calculations according to those programs. . A functional block that realizes the functions of the image processing apparatus 1 according to the present embodiment is configured by a combination of the software control unit configured as described above and hardware.

  Next, functions of the image processing apparatus 1 according to the present embodiment will be described. FIG. 2 is a block diagram illustrating a functional configuration of the image processing apparatus 1 according to this embodiment. As shown in FIG. 2, the image processing apparatus 1 according to the present embodiment includes a controller 100, an ADF (Auto Document Feeder) 110, a scanner unit 111, a paper discharge tray 112, a display panel 113, and a paper feed table. 114, a print engine 115, a paper discharge tray 116, and a network I / F 117.

  The controller 100 includes a main control unit 130, an engine control unit 101, a network control unit 102, an image processing unit 103, and an operation display control unit 104. As shown in FIG. 2, the image processing apparatus 1 according to the present embodiment is configured as a multifunction machine having a scanner unit 111 and a print engine 115. In FIG. 2, the electrical connection is indicated by solid arrows, and the flow of paper is indicated by broken arrows.

  The display panel 113 is an output interface that visually displays the state of the image processing apparatus 1, and an input when the user directly operates the image processing apparatus 1 or inputs information to the image processing apparatus 1 as a touch panel. It is also an interface (operation unit). The network I / F 117 is an interface for the image processing apparatus 1 to communicate with other devices via the network. As the network interface I / F 117, an interface such as Ethernet (registered trademark), USB, Bluetooth (registered trademark), Wi-Fi (Wireless Fidelity), or the like is used.

  The controller 100 is configured by a combination of software and hardware. Specifically, a control program such as firmware stored in a nonvolatile storage medium such as the ROM 30 or the HDD 40 is loaded into the RAM 20. And the controller 100 is comprised by hardware, such as a software control part comprised by CPU10 calculating according to those programs, and an integrated circuit. The controller 100 functions as a control unit that controls the entire image processing apparatus 1.

  The main control unit 130 plays a role of controlling each unit included in the controller 100 and gives a command to each unit of the controller 100. The engine control unit 101 serves as a driving unit that controls or drives the print engine 115, the scanner unit 111, and the like. The network control unit 102 inputs signals and commands input from the information processing apparatus or the like connected to the image processing apparatus 1 via the network I / F 117 to the main control unit 130.

  In addition, the main control unit 130 controls the network control unit 102 and accesses other devices via the network I / F 117. In the present embodiment, a case where the main control unit 130 performs data read / write control on the NAND 90 will be described as an example. In this case, the main control unit 130 functions as a storage medium control device that controls reading and writing of information with respect to the storage medium, and the control program of the main control unit 130 functions as a storage medium control program. Details of the functional configuration of the main control unit 130 functioning as a storage medium control device will be described later.

  The image processing unit 103 generates drawing information based on image information to be printed out under the control of the main control unit 130. The drawing information is information for drawing an image to be formed in the image forming operation by the print engine 115 as an image forming unit. The image processing unit 103 processes image data input from the scanner unit 111 and generates image data. The image data is information stored in the image processing apparatus 1 as a result of the scanner operation or transmitted to another device via the network I / F 117. The operation display control unit 104 displays information on the display panel 113 or notifies the main control unit 130 of information input via the display panel 113.

  When the image processing apparatus 1 operates as a printer, first, the network control unit 102 receives a print job from another apparatus such as a PC via the network I / F 117. The network control unit 102 transfers the received print job to the main control unit 130. When receiving the print job, the main control unit 130 controls the image processing unit 103 to generate drawing information based on document information or image information included in the print job.

  When drawing information is generated by the image processing unit 103, the engine control unit 101 executes image formation on a sheet that is a recording medium conveyed from the paper feed table 114 based on the generated drawing information. As the recording medium, in addition to the above-described paper, a sheet-like material such as a film or plastic can be used as long as it is an object for image formation output. As a specific mode of the print engine 115, an image forming mechanism using an ink jet method, an image forming mechanism using an electrophotographic method, or the like can be used. A document on which an image is formed by the print engine 115 is discharged to a discharge tray 116.

  When the image processing apparatus 1 operates as a scanner, that is, an image reading apparatus, the operation display control unit 104 or the network control unit 102 transfers a scan execution signal to the main control unit 130 according to a scan execution instruction. The scan execution instruction is input from an external device via an operation of the display panel 113 by the user or the network I / F 117. The main control unit 130 controls the engine control unit 101 based on the received scan execution signal.

  The engine control unit 101 drives the ADF 110 and conveys the document to be imaged set on the ADF 110 to the scanner unit 111. Further, the engine control unit 101 drives the scanner unit 111 and images a document conveyed from the ADF 110. If no original is set on the ADF 110 and the original is directly set on the scanner unit 111, the scanner unit 111 captures the set original under the control of the engine control unit 101. That is, the scanner unit 111 operates as an imaging unit.

  In the imaging operation, an imaging element such as a CCD included in the scanner unit 111 optically scans the document, and imaging information based on the optical information is generated. The engine control unit 101 transfers the imaging information generated by the scanner unit 111 to the image processing unit 103.

  The image processing unit 103 generates image information based on the imaging information received from the engine control unit 101 under the control of the main control unit 130. Image information generated by the image processing unit 103 is stored in a storage medium attached to the image processing apparatus 1 such as the HDD 40. The image information generated by the image processing unit 103 is stored in the HDD 40 or the like as it is according to a user instruction, or is transmitted to an external device by the network control unit 102 via the network I / F 117.

  Further, when the image processing apparatus 1 operates as a copying machine, the image processing unit 103 generates drawing information based on imaging information received from the scanner unit 111 by the engine control unit 101 or image information generated by the image processing unit 103. To do. Based on the drawing information, the engine control unit 101 drives the print engine 115 as in the case of the printer operation.

  Next, details of the configuration of the NAND 90 according to the present embodiment will be described. FIG. 3 is a conceptual diagram illustrating the configuration of the NAND 90 according to this embodiment. As shown in FIG. 3, the NAND 90 according to the present embodiment includes a plurality of blocks, and each block includes a plurality of storage areas (hereinafter referred to as “pages”) in which data is read and written. Further, each page is composed of a plurality of subpages (for example, power-of-two subpages) that are logically divided areas.

  In the present embodiment, one file is stored in one subpage. Further, data write control to the NAND 90 is performed in units of pages, and is not performed in units of sub-pages that are logically divided areas.

  FIG. 4 is a diagram illustrating a file system of the NAND 90 according to this embodiment. As shown in FIG. 4, each page of the NAND 90 according to the present embodiment is classified into a super block, a partition block, a file data block, and a file metadata block that stores metadata of a file stored in the file data block. The

  The super block is a page for storing various information for managing the entire file system. The partition block is a page that stores information for managing various types of information regarding each page and each subpage (hereinafter collectively referred to as “partition”). FIG. 5 is a diagram illustrating the contents of various types of information (hereinafter referred to as “partition information”) stored in the partition block. As shown in FIG. 5, the partition information includes “total number of pages”, “creation date / time”, “file metadata management information”, “subpage free area”, “access right”, and the like.

  “Total number of pages” indicates the number of pages of the entire partition constituting the NAND 90, and “creation date” indicates the creation date of the partition. “File metadata management information” is information for identifying whether or not file metadata described later is used. Specifically, for example, “file metadata management information” is a fixed-length storage area for storing the page number of each subpage in which file metadata is stored. Each page number stored in the storage area is either a number indicating that it is unused (for example, “0xffffffff”) or a page number of a subpage being used (for example, an address of a subpage).

  “Subpage free area” is information indicating whether each subpage is a free area (hereinafter referred to as “free area information”). For example, the free area information is a 1-bit value indicating “1” when the area is an empty area and indicating “0” when the area is not an empty area. “Access right” is access information (read only, read / write, etc.) for the partition.

  The file data block is a page for storing a file. Depending on the number of files, a plurality of pages become file data blocks, and each file data block is given a file data block number. For example, as shown in FIG. 4, a file data block to which “1” is assigned is represented as “file (1)”.

  The file metadata block is a page for storing metadata of each file stored in the file data block. A file metadata block corresponds to a file data block number. For example, a file metadata block that stores metadata of each file stored in the file data block of “file (1)” illustrated in FIG. 4 is represented as “file metadata (1)”.

  FIG. 6 is a diagram illustrating the content of information included in the file metadata. As shown in FIG. 6, the file metadata includes information such as “file name”, “file size”, “creation date / time”, “access right”, “file location information”, and “authentication processing timing information”. “File name” indicates the name of the file, “File size” indicates the size of the file, “Created date / time” indicates the date / time when the file was created, and “Access right” indicates access information for the file (read) Only, read / write, etc.).

  “File position information” indicates the position of the subpage in which the file is stored (for example, the page number indicating the address of the subpage). “Authentication processing timing information” is information indicating the timing of executing processing for checking whether a file has been tampered with (hereinafter referred to as “authentication processing”). Details regarding the authentication processing will be described later.

  That is, when the main control unit 130 reads out the data stored in the NAND 90, first, the position information where the file metadata is stored is acquired from the partition information stored in the partition block. Then, the main control unit 130 acquires the position information of the file included in the file metadata stored at the acquired position, accesses the address indicated by the acquired position information, and reads the stored file. That is, the partition information is data management information for reading data from the storage medium.

  Next, of the functions of the main control unit 130 according to the present embodiment, functions related to data read / write control for the NAND 90 will be described. FIG. 7 is a block diagram illustrating a functional configuration related to data read / write control with respect to the NAND 90 among the functions of the main control unit 130 according to the present embodiment. As shown in FIG. 7, the main control unit 130 according to the present embodiment includes a data update unit 131, a data deletion unit 132, an authentication processing setting unit 133, and an authentication processing unit 134.

  The data update unit 131 updates the data stored in the NAND 90. FIG. 8 to FIG. 14 are diagrams illustrating examples of data update modes by the data update unit 131. In FIG. 8 to FIG. 14, the file data is described as “data”.

  For example, when updating the files stored in the blocks of data (1) and data (2), the data updating unit 131 first blocks the blocks of data (1) and data (2) as shown in FIG. Is read out and stored in the RAM 20. Then, as shown in FIG. 9, the data update unit 131 updates the update target file stored in the data (1) and data (2) blocks stored in the RAM 20. Data (1) and data (2) after file update are referred to as data (1 ′) and data (2 ′), respectively.

  The data update unit 131 that has updated the file writes the updated data (1 ′) and data (2 ′) stored in the RAM 20 to the NAND 90. At this time, the updated data block is stored in a page (storage area) different from the pre-update data block, as shown in FIG. In the state shown in FIG. 10, since “file position information” included in the updated file metadata indicates the position of the subpage in which the file before update is stored, data (1 ′) and data (2 The data of block ') is in a state where reference is impossible.

  Next, as shown in FIG. 11, the data update unit 131 reads out file metadata (here, file metadata (1) is taken as an example) corresponding to the updated data block, and stores it in the RAM 20. . Then, the data update unit 131 updates the file metadata stored in the RAM 20 as shown in FIG. Accordingly, the “file position information” shown in FIG. 6 included in the file metadata is changed from the subpage address of the block of the data (1) before the update to the subpage address of the block of the data (1 ′) after the update. Changed to

  The data updating unit 131 that has updated the file metadata writes the updated file metadata (1 ′) stored in the RAM 20 to the NAND 90. At this time, the updated file metadata is stored in a page different from the pre-updated file metadata as shown in FIG. In the state shown in FIG. 12, the “file metadata management information” included in the partition information indicates the position of the subpage in which the file metadata before update is stored, so the file metadata (1 ′) cannot be referred to. It is a state.

  Next, as shown in FIG. 13, the data update unit 131 reads the partition information stored in the partition block and stores it in the RAM 20. Then, the data updating unit 131 updates the partition information stored in the RAM 20 as shown in FIG. As a result, the “file metadata management information” and “subpage free area” shown in FIG. 5 included in the partition information are updated.

  As shown in FIG. 14, the data updating unit 131 that has updated the partition information overwrites the partition information before the change with the partition information after the change stored in the RAM 20. Thus, for the first time, the updated file can be referred to, while the pre-update file cannot be referred to.

  With such a configuration, for example, when the processing shown in FIG. 8 or FIG. 9 is performed by the data updating unit 131, the state of data stored in the NAND 90 is changed even if the power supply is stopped. Absent. Further, for example, when the process shown in FIG. 10 is performed by the data updating unit 131, even if the power supply is stopped, the changed data is stored in the NAND 90, but the reference is impossible. There is no change in the accessed data.

  Further, for example, when the processing shown in FIG. 11 by the data updating unit 131 is being performed, even if the power supply is stopped, the state of the file metadata stored in the NAND 90 is not changed, so that access is made. There is no change to the data. Also, for example, when the processing shown in FIG. 12 by the data updating unit 131 is being performed, the changed file metadata is stored in the NAND 90 even if the power supply is stopped, but in a state where reference is impossible. There is no change in the file metadata accessed.

  Further, for example, when the processing shown in FIG. 13 by the data updating unit 131 is performed, even if the power supply is stopped, the partition information stored in the NAND 90 is not changed. There is no change in the data. That is, there is no change in the accessed file.

  Returning to the description of FIG. The data deletion unit 132 deletes unreferenced data. In the process shown in FIG. 13 described above, “file metadata management information” and “subpage free area” shown in FIG. 5 included in the partition information are updated. As a result, the “page metadata management information” is updated to a number indicating that the subpage number for storing the file metadata before update is unused.

  In addition, in the “subpage free space”, the free space information of the subpage storing the file metadata is updated to “1”. Note that a subpage or page is empty includes not only the case where no data is stored in the subpage or page, but also the case where a file that is no longer necessary after updating, such as a file before updating, is stored. .

  FIG. 15 is a flowchart illustrating an operation of data deletion processing by the data deletion unit 132. As shown in FIG. 15, the data deleting unit 132 refers to the “subpage free area information” in the partition information (S1501), and determines whether or not all the blocks in which the subpages that are free areas exist are free pages. Determination is made (S1502).

  When all the pages are empty (S1502 / YES), the data deletion unit 132 deletes the block data (S1503). On the other hand, if all the pages are not empty (S1502 / NO), the process ends.

  The authentication process setting unit 133 sets “authentication process timing information” of the file metadata shown in FIG. “Authentication processing timing information” is, for example, one of “mounting”, “accessing”, and “non-authentication”. “At the time of mounting” of “authentication process timing information” indicates that the file authentication process is performed at the time of the recognition process in which the NAND 90 file system is mounted, that is, the NAND 90 is made available. “Access time” of “authentication process timing information” indicates that the file authentication process is performed when the image processing apparatus 1 is turned on and the file is first accessed. Further, “non-authentication” of “authentication processing timing information” indicates that file authentication processing is not performed.

  For example, the authentication processing setting unit 133 sets “authentication processing timing information” based on setting information input from the user. In addition, the authentication processing setting unit 133 may set “authentication processing timing information” based on the file type, the extension, and the like.

  The authentication processing unit 134 performs authentication processing for each file based on the “authentication processing timing information” set by the authentication processing setting unit 133. The authentication process is, for example, a falsification detection process using a hash value of a file. It is assumed that information necessary for authentication processing, such as an authentication processing function to be used, is registered in advance when a TPM (Trusted Platform Module) driver of the image processing apparatus 1 is initialized.

FIG. 16 is a flowchart illustrating an operation of authentication processing by the authentication processing unit 134 when the power of the image processing apparatus 1 is turned on. As shown in FIG. 16, the authentication processing unit 134 refers to “authentication processing timing information” of the file metadata for the file stored in the NAND 90 (S1601), and determines whether or not “when mounted” is indicated. (S1602). If the “authentication process timing information” indicates “when mounted”, the authentication processing unit 134 executes a file authentication process (S1603).

  The authentication processing unit 134 that has executed the file authentication processing determines whether or not the processing has been completed for all the files stored in the NAND 90 (S1604). The authentication processing unit 134 ends the processing when the processing is completed for all the files (S1604 / YES).

  On the other hand, when the processing has not been completed for all the files (S1604 / NO), the authentication processing unit 134 refers to the “authentication processing timing information” of the file metadata for the next file (S1601), and so on. Repeat the process. On the other hand, if the “authentication process timing information” is not “during mounting” (S1602 / NO), the process proceeds to S1604 without performing the authentication process for the file.

  That is, when the power of the image processing apparatus 1 is turned on by the process shown in FIG. 16, the authentication process is performed only for the file whose “authentication process timing information” is “when mounted”.

  FIG. 17 is a flowchart illustrating the operation of authentication processing by the authentication processing unit 134 when accessing a file. As shown in FIG. 17, the authentication processing unit 134 refers to the “authentication processing timing information” of the file metadata for the file to be accessed in the NAND 90 (S1701), and determines whether or not “when accessing” is indicated (S1701). S1602).

  When the “authentication processing timing information” indicates “when accessing” (S1702 / YES), the authentication processing unit 134 determines whether or not the file is unauthenticated (S1703). Whether or not the file is unauthenticated is determined by, for example, whether or not the “authenticated flag” included in the file metadata is “ON”.

  If the file is unauthenticated (S1703 / YES), the authentication processing unit 134 executes file authentication processing (S1704). On the other hand, when the “authentication process timing information” is not “at the time of access” (S1702 / NO) or the file has been authenticated (S1703 / NO), the authentication processing unit 134 ends the process without performing the authentication process. To do. The authentication processing unit 134 that has executed the file authentication processing turns ON the authenticated flag of the file for which the authentication processing has been executed (S1705).

  As described above, when updating the data stored in the NAND 90, the image processing apparatus 1 according to the present embodiment stores the updated data in a page different from the data before the update, and then Update the partition information so that the updated data can be read. As a result, it is possible to reduce the occurrence of data mismatch due to the power supply being stopped during the data update in the NAND 90.

  The image processing apparatus 1 according to the present embodiment performs file authentication processing according to the timing of authentication processing set for each file. As a result, when the file system is mounted, authentication processing is performed only for the files whose authentication processing timing information is set at the time of mounting, so the system startup time is shortened compared to the case where authentication processing is performed for all files during mounting. It becomes possible. In addition, since file authentication processing is supported in the file system, detailed error handling can be performed even when file authentication processing fails. However, the configuration of such an authentication process is not essential, and even if there is no such configuration, the occurrence of data inconsistency due to the power supply being stopped during the data update in the NAND 90 is reduced. Is possible.

  In the above embodiment, a case has been described in which a plurality of subpages that are logical areas are configured in each page in the NAND 90 and one file (data file) is stored in one subpage. In addition, one file (data file) may be stored in one page. In this case, as compared with the case where one file is stored in one subpage, the storage area of each page becomes wasteful. However, when one file is updated, it is not necessary to perform processing in consideration of the existence of other files included in the same page, so an image is compared with a case where one file is stored in one subpage. It becomes possible to reduce the processing load in the processing apparatus 1.

  In the above embodiment, the size of the partition information increases as the number of files and file metadata stored in the NAND 90 increases. Therefore, a plurality of partition blocks may be provided depending on the number of files and file metadata. If there are multiple partition blocks and there are multiple partition information, data inconsistency may occur if the power supply is stopped after overwriting one partition information and before overwriting other partition information. .

  Therefore, the number of partition blocks provided in the NAND 90 may be limited to one. That is, one piece of data management information that is partition information is stored as a data file in the NAND 90 that is a storage medium. In this case, it is necessary to restrict the number of files and file metadata so that partition information is stored in one partition block. However, in such a configuration, it is possible to prevent data inconsistency from occurring due to the power supply being stopped before all of the plurality of partition information are overwritten. Therefore, according to such a configuration, it is possible to further reduce the occurrence of data mismatch due to the power supply being stopped during the data update in the NAND 90.

  In this embodiment, the firmware of the NAND 90 is not equipped with a wear leveling function. By not mounting the wear leveling function, it is possible to prevent a decrease in maintainability of the NAND 90 and duplication of duties between the firmware side and the software side that controls the NAND 90.

  In the present embodiment, the update of data stored in the NAND 90 has been described as an example. In the case of the NAND 90 having a relatively small capacity compared to other storage media such as an HDD, it is possible to store log data for restoring data before update when data inconsistency occurs due to data update failure. Causes pressure on the capacity. According to the present embodiment, even if the storage medium has a relatively small capacity such as the NAND 90, the power supply is stopped during the data update without reducing the capacity as compared with the case of storing the log data. The occurrence of data inconsistency can be reduced. However, the present embodiment is not limited to the NAND 90 and can be similarly applied to a storage medium that is configured by a plurality of storage areas and in which data is read and written in units of storage areas.

  In the present embodiment, the image processing apparatus 1 has been described as an example. However, the present embodiment is not limited to the image processing apparatus 1 and can be similarly applied to various information processing apparatuses including a storage medium such as the NAND 90. Information processing devices include built-in systems and general PCs, but the built-in systems are backed up when power supply is stopped due to power outages such as batteries, compared to general PCs from the viewpoint of cost reduction. It is rare to have. According to the present embodiment, even in an embedded system that does not include a battery or the like, it is possible to reduce the occurrence of data inconsistency due to the stop of power supply during the update of data in the storage medium.

1 Image processing apparatus 10 CPU
20 RAM
30 ROM
40 HDD
50 I / F
60 LCD
70 Operation unit 80 Bus 90 NAND
DESCRIPTION OF SYMBOLS 100 Controller 101 Engine control part 102 Network control part 103 Image processing part 104 Operation display control part 110 ADF
111 Scanner Unit 112 Paper Discharge Tray 113 Display Panel 114 Paper Feed Table 115 Print Engine 116 Paper Discharge Tray 117 Network I / F
130 Main Control Unit 131 Data Update Unit 132 Data Delete Unit 133 Authentication Processing Setting Unit 134 Authentication Processing Unit

JP 2008-59241 A

Claims (9)

A storage medium control device that controls reading and writing of data in a storage area unit with respect to a storage medium composed of a plurality of storage areas,
A data update unit for updating the data stored in the storage medium,
The data update unit
Based on data management information that is information for reading the data from the storage area, the data is read from the storage area and updated,
Storing the updated data in the storage area different from the storage area in which the data before update is stored;
After storing the updated data in the another storage area, the data management information is updated to data management information for reading the updated data from the other storage area. Control device. One storage area stores one data file,
The storage medium control device according to claim 1, wherein the data updating unit updates the one data file stored in the storage area as one data. One storage area is further divided into a plurality of logical areas,
One logical area stores one data file,
The storage medium control device according to claim 1, wherein the data update unit updates all data files stored in the plurality of logical areas constituting the storage area as one data. . The storage medium control apparatus according to claim 1, wherein one piece of the data management information is stored as a data file in the storage medium. An authentication process setting unit for setting authentication process timing information indicating a timing for executing the authentication process of the data;
The storage medium control device according to claim 1, further comprising: an authentication processing unit that executes authentication processing of the data based on the set authentication processing timing information. When the authentication processing timing information set for the data indicates the timing of recognition processing for making the storage medium available, the authentication processing unit performs the data authentication processing during the recognition processing. The storage medium control device according to claim 5, wherein: When the authentication processing timing information set for the data indicates a timing for accessing the data, the authentication processing unit executes the data authentication processing when accessing the data. The storage medium control device according to claim 5. A storage medium control program for controlling reading and writing of data in a storage area unit with respect to a storage medium composed of a plurality of storage areas,
Reading and updating the data from the storage area based on data management information which is information for reading the data from the storage area;
Storing the updated data in a storage area different from the storage area in which the data before update is stored;
After storing the updated data in the another storage area, updating the data management information to data management information for reading the updated data from the another storage area. A storage medium control program that is executed. A storage medium control method for controlling reading and writing of data in units of storage areas with respect to a storage medium composed of a plurality of storage areas,
Based on data management information that is information for reading the data from the storage area, the data is read from the storage area and updated,
Storing the updated data in the storage area different from the storage area in which the data before update is stored;
After storing the updated data in the another storage area, the data management information is updated to data management information for reading the updated data from the other storage area. Control method.