JP2014153872A - Information processing device, information processing method, and program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an information processing device and a program that are capable of efficiently suppressing deterioration of a storage device.SOLUTION: An operation state management unit 205 manages an operation state of an information processing device 100, and a journal log recording control unit 206 holds information of a journaling function corresponding to the operation state. When a predetermined condition is satisfied, the operation state of the information processing device and utilization status of the journaling function are confirmed, and a switch is made to the journaling function corresponding to the operation state.

Description

  The present invention relates to an information processing apparatus, an information processing method, and a program for operating a file.

  In an information processing apparatus equipped with a secondary storage device such as a hard disk drive (HDD), if an abnormal event such as power disconnection or removal of a storage medium occurs during a file operation on the secondary storage device, the file is managed For this reason, there is a case where consistency between the information and the contents of the file cannot be obtained. In order to reduce such a situation where consistency is lost, a file system having a journaling function is used. In a file system with a journaling function, even when a failure occurs during data operation, a file or directory update operation history and update contents are held in the secondary storage device as a journal log in order to improve recovery performance.

  In Patent Document 1, data to be written to the journaling area is stored in a stack, and when the update processing to the secondary storage device is completed first and the journal log becomes unnecessary, the data in the stack is deleted. A method is disclosed.

  Further, Patent Document 2 discloses a method of performing journal acquisition by dividing a database into logical units and setting journal log acquisition contents and necessity / unnecessity of journal acquisition.

Japanese Patent Laid-Open No. 11-203186 JP 05-061751 A

In the conventional journaling file system, use of the journaling function is set when the file system is mounted. Therefore, the setting of the journaling function cannot be dynamically switched according to the operation status of the information processing apparatus, and it is difficult to suppress deterioration of the secondary storage device.
In the techniques described in Patent Document 1 and Patent Document 2, although the number of times of writing to the secondary storage device is reduced, the journaling function is not used in the setting according to the operation status of the information processing device. Degradation of the secondary storage device cannot be suppressed efficiently.

  In order to solve the above-described problem, an information processing apparatus according to the present invention is an information processing apparatus including a storage device, and at least a part of data to be written in a first storage area of the storage device or an operation on the data Writing means for writing history information related to information in the second area of the storage device, detection means for detecting the state of the information processing device, possible states of the information processing device, and settings corresponding to the state Information processing comprising: holding means for holding in association; and control means for controlling the writing means based on a setting corresponding to the state detected by the detecting means with reference to the holding means apparatus.

  According to the present invention, since the journaling function is used with settings according to the operation status of the information processing apparatus, it is possible to efficiently suppress the deterioration of the storage device.

It is the schematic which shows the basic composition of information processing apparatus. It is the schematic which shows main function structures. It is a schematic diagram which shows the structure of a journaling area | region. It is a table which manages an operation state. This is a table for managing the recorded contents of journal logs. It is a table which manages a response | compatibility of an operation state and a journaling function. It is a flowchart which shows the flow of a process from after power activation to control of a journaling function. It is a flowchart which shows the flow of control of a journaling function. It is the schematic which shows main function structures. It is a flowchart which shows the flow of control of a journaling function. It is a flowchart which shows the flow of control of a journaling function.

<Embodiment 1>
In the first embodiment, the journal log recording amount is suppressed by dynamically controlling the journaling function in the journaling file system according to the operation status of the information processing apparatus. Hereinafter, Embodiment 1 of the present invention will be described in detail with reference to the drawings. FIG. 1 is a diagram illustrating a schematic configuration of an information processing apparatus 100 according to the first embodiment. First, the outline of the basic configuration of the information processing apparatus will be described with reference to FIG.

  In the information processing apparatus 100, the CPU 101 normally processes a plurality of processes one by one, and switches the processes at regular intervals. Here, the CPU 101 may include a plurality of processor cores that perform arithmetic processing or the like, or may include a plurality of CPUs 101 themselves in the information processing apparatus 100. The primary storage device 102 is a volatile storage device that temporarily records programs and data that are expanded and read by the CPU 101, and includes an SDRAM, an SRAM, and the like. Data such as programs, files, and directories developed in the primary storage device 102 is recorded in the secondary storage device 104. The secondary storage device 104 is a non-volatile storage device, such as a magnetic disk-coated storage device, a storage device that records data using a NAND flash memory with a limited number of writes, or Optical disks that record data using semiconductor lasers, magneto-optical disks that record data using red laser light and a magnetic field, non-volatile memory cards that can be inserted into and removed from information processing devices, or non-volatile flash memories Can be used. A non-volatile storage device having a built-in non-volatile flash memory, such as a flash SSD, may be used that is configured to be able to realize the same function as a hard disk drive. When the information processing apparatus 100 is activated, the information processing apparatus 100 expands the compression program (including an OS, a program for realizing a flow described later, options, and the like) held in the secondary storage device 104 to the primary storage device 102, and the CPU 101 performs primary processing. A journaling file system to be described later is realized by executing the program developed in the storage device 102.

  The operation of the file in the secondary storage device 104 is realized by making a READ request (read request) and a WRITE request (write request) from the operating system realized by the CPU 101 via the I / O controller 103.

  Next, a journaling file system used in this embodiment will be described.

  Information recorded in a general file system has a data portion (also referred to as actual data) corresponding to the information content and meta data corresponding to management information of the information. Consistency between file contents and file management information in the event of an abnormal event such as a power outage or storage medium removal during file operations because the data part and meta data are configured separately May not be removed. The journaling file system first records history information including updated contents of files and directories and management information thereof in the secondary storage device in order to avoid such a situation where consistency cannot be obtained, and then the secondary storage device. Update the recorded content of. In this way, by manipulating the file on the secondary storage device in a two-stage process, it is possible to suppress the loss of consistency during the process.

  When a journaling file system constructs a file system on a secondary storage device, a journaling area (second storage area) for recording and managing journal logs as history information on the secondary storage device; A data area (first storage area) for recording the contents of a file that is composed of binary data and text data and the directory that manages the file is secured. Here, the journal log is a file / directory update operation history (operation information), update contents, and file so that if a failure occurs during the operation of the secondary storage device, the state during the file operation can be recovered. This is log information that holds meta data update contents that are system management information.

  For example, in a file system ext3 (third extended file system) having a function of recording a journal log in a journaling area of the journaling file system (hereinafter referred to as a journaling function), the meta data is stored in the storage area of the secondary storage device 104. It includes management information of a block group that is a management unit, and management information related to files recorded in the block group. The management information of a block group includes a block number in which a block bitmap representing the usage status of each block included in the block group as 0 and 1 is stored, and a usage status of inode holding file management information as 0 There are an inode bitmap block number, an inode block start block number, a block group empty block number, a block group empty inode number, and a block group directory number. Note that a plurality of secondary storage devices 104 may be physically provided.

  Further, the management information regarding the file is information held by the inode. Specifically, a file mode representing a file type such as a symbolic link or a device file, a file size, a file last reference time, a file last state change time, a file last update time, a file deletion time, a user ID, a group ID, Includes the number of file links, number of used blocks, block number, generation number, etc.

  The inode is a data structure often used in the Unix (registered trademark) file system. The inode stores basic information about objects on the file system such as files and directories, and all files are stored in the inode. Linked.

  FIG. 2 is a schematic diagram showing the main functional configuration of the information processing apparatus 100 in association with the physical configuration. The information processing apparatus 100 uses the operating system 200 realized by the CPU 101 to manage the physical resources and software resources of the information processing apparatus. Then, the process 201 operates on the operating system 200 to control the functions of the information processing apparatus.

  The journaling file system 202 has a journaling area 204 for recording journal logs on the secondary storage device 104. When the journaling function is enabled, the journal log recording unit 203 records journal logs in the journaling area 204. .

  The operation state management unit 205 defines an operation state that the information processing apparatus 100 can take in the operation state management table 207 and manages the operation state of the information processing apparatus 100. The operation state of the information processing apparatus 100 is switched by the process 201 operating on the operating system through the operation state management unit 205.

  The journal / log recording control unit 206 defines a plurality of detail levels of the recorded contents of the journal log in a stepwise manner in the journal / log content management table 208. The operation state correspondence management table 209 holds the contents of the journal log to be recorded for the operation state managed by the operation state management table 207 of the operation state management unit 205. The journal / log recording control unit 206 controls the journaling function based on the correspondence information in the operation state correspondence management table 209.

  The operation state management table 207, journal / log content management table 208, and operation state correspondence management table 209 are stored in the secondary storage device.

  Next, the journaling area 204 of the journaling file system will be described in more detail.

  FIG. 3 is a diagram showing details of the journal area 204 and transactions of the journaling file system. In the journaling file system, a plurality of journal logs are collected as one transaction 303 and stored in the journaling area in units of transactions on the buffer.

  The journaling area 204 shown in the figure is different from the journaling information management block 300 and the transaction area 303 (originally, one transaction unit is written in the transaction area 303. A ring buffer 301 that repeats recording and release. In the present embodiment, the journaling area 204 has a fixed size (fixed length). However, the power of 2 may be used as the size of the journaling area 204 in about 5% of the total storage area of the secondary storage device 104.

  The journaling information management block 300 holds transaction start position information 302. The start position information 302 holds the start position (start address, block number, etc.) of the transaction area 303 that holds the oldest transaction recorded in the ring buffer 301.

  The transaction 303 includes a descriptor block 304 that manages and holds block information to be written to the secondary storage device 104, a meta data block 305, and a commit block 306 that indicates the end of the transaction. Details of these will be described later.

  Next, the flow of processing for the journal / log recording unit 203 will be described. When a data write operation is performed from an application, the journal / log recording unit 203 of the journaling file system first changes data on the primary storage device 102 and meta data corresponding to file system management information.

  Of these changes, a plurality of journal log recording targets are collectively written as a transaction 303 in the ring buffer 301 of the journaling area 204 on the secondary storage device 104. Here, it may be arranged as a transaction 303 for each type of file operation. When a transaction is written in the ring buffer 301, the start information position 302 is referred to and the transaction area 303 with the oldest update time is overwritten. Note that, when writing a log, even if the transaction is the oldest transaction, it is not overwritten if a valid journal log is retained.

  Thereafter, the journaling file system 202 actually reflects the target to be reflected in the secondary storage device 104 among the journal logs held in the journaling region 204 to the data region (one of the regions other than the journaling region) of the secondary storage device 104. Reflect (arrow 210). As a trigger for reflecting the journal log held in the journaling area 204 by the journaling file system 202 to the data area, a predetermined size (a size of the size of the journaling area) in which a valid transaction held in the journaling area 204 is set. (1/4 or 1/2). In addition, you may comprise so that it may reflect every predetermined time (5 second unit). Note that when the reflection of all journal logs included in the transaction 303 in the data area of the secondary storage device 104 is completed for one transaction 303, the journaling file system 202 releases the transaction 303. Specifically, each transaction 303 is provided with a valid bit indicating whether it is valid or invalid, and is released by changing the valid bit from valid to invalid. Here, the journaling file system 202 synchronizes the transaction 303 to be reflected from the head of the transaction 303 to the data area of the secondary storage device 104. Then, when the synchronization with the data area is completed for the last commit block, it is understood that the reflection process for the transaction 303 is completed. Then, the start position information 302 is updated to the position information at the beginning of the next transaction (the transaction length is added when the start position is an address, and the number of blocks for the transaction is added when the block is a block). The transaction area before update is referenced when writing to a new journal log.

  The journaling file system 202 writes in parallel to both the journaling area 204 and the data area (not shown) of the secondary storage device 104. Also, since journal logs are recorded when meta data is updated, if the meta data contains items that are updated by read access, such as the file last reference time, the file is not updated But record journal logs.

  For the journaling function, the contents and recording order of journal logs to be recorded are specified as options when the journaling file system is mounted. The information processing apparatus 100 according to the present embodiment uses Linux (registered trademark) as an operating system and uses ext3 as a file system. In the following description, “mounting” a file system means an operation for recognizing the device and allowing the file system to recognize the secondary storage device 202 so that the file can be read and written. Specifically, in order to make the storage resources of the secondary storage device 104 available, the operation of incorporating the storage resources of the secondary storage device 104 into a tree structure showing the structure of the entire storage resource is shown. It can simply be interpreted as the initial work required to make the storage resources of the secondary storage device 104 available. Note that the reverse operation (for example, work for separating from the tree structure) is called “unmount”.

  When the operating system issues a mount command when the system of the information processing apparatus 100 is activated, the setting of the journaling function (for example, the degree of detail of the contents of the journal log to be recorded and the control method) is specified as an option of the mount command. Specifically, by specifying “data = ordered”, setting is made to record the meta data as a journal log in the journaling area. Then, by specifying “data = journal”, the setting of recording meta data and file update contents as a journal log in the journaling area is performed. It is also possible to specify “data = writeback” as an option. In this case, setting the meta data as a journal log recording target is the same as “data = ordered”, but the order of the update of the data area with respect to the file update content and the recording of the journal log are different. In “data = ordered”, the journal log is recorded after the data area is updated. In “data = writeback”, the order of the data area update and the journal log recording is performed at an arbitrary timing. Not guaranteed. In the journal mode, both meta data and actual data are stored in the journaling area, so that file system corruption and data loss can be suppressed, but all actual data is written twice to the journaling area and data block ( Write to the journaling area first, then write again to the data block), and write processing performance will be reduced compared to other modes. The journaling mode may be set by the user in advance as a journaling setting, or the file system may automatically determine according to the type of data. For example, the writeback mode or ordered mode is used when manipulating data with high real-time characteristics, and the journal mode is used when manipulating important data used for authentication, QOS data, file system update, or system recovery. May be used. The journaling setting is preferably stored in the file management block.

  Also, by specifying “notime” and the option when executing the mount command, it is possible to suppress the recording of the journal log in response to the update of the file last reference time of the meta data that occurs at the time of file reference. Note that when the journaling function is enabled, the journal area 204 on the secondary storage device 104 is repeatedly used when accessing the file system. Therefore, the secondary storage device 104 is specified more than when the journaling function is disabled. The number of writes to the storage configuration increases.

  Next, a journaling function switching procedure in the present embodiment will be described with reference to FIGS. FIG. 7 is a flowchart showing the flow of processing from when the information processing apparatus 100 is turned on until the journal / log recording content is controlled.

  In step S700, the information processing apparatus 100 is turned on (or restarted or returned from a power saving mode such as “standby, sleep, hibernation”), and the process is started. In step S701, the operating system of the information processing apparatus 100 mounts the journaling file system. When the journaling file system is mounted for the first time on the logically divided target section of the secondary storage device 104 after the power is turned on, the journal log is recorded according to the option (initial setting or previous setting) specified when executing the command. To control.

  After mounting the journaling file system, steps S702 to S704 are repeated while the information processing apparatus 100 is activated (the upper part of S702 and the lower part of S704 are loop symbols, and the loop is exited by unmounting or shutting down). . In step S702, the operation state management unit 205 uses the timer mechanism of the operating system to monitor the elapse of time after the journaling file system is mounted, and determines whether a predetermined time interval has elapsed. If the predetermined time interval has elapsed, the process moves to step S704. If the predetermined time interval has not elapsed, the process moves to step S703.

  In step S703, the operation state management unit 205 determines whether or not the operation state of the information processing apparatus 100 has changed. If the operation state management unit 205 determines that the operation state has changed, the process proceeds to step S704. If not, the process proceeds to step S702.

  In step S704, the journal / log recording control unit 206 controls the journaling function shown in FIG.

  FIG. 8 is a detailed flow chart of the processing in step S704 in FIG. 7, and is a flowchart showing a flow of processing in which the journal / log recording control unit 206 controls the setting of the journaling function (journal log recording content). is there. In step S800, the journal / log recording control unit 206 refers to the operation state correspondence management table 209, and the type ID indicating the setting of the journaling function set in the information processing apparatus 100 is the current operation of the information processing apparatus 100. It is determined whether or not the type ID (type ID registered in the operation state correspondence management table 209) corresponding to the state (mode ID) matches. If the recorded contents of the journal log match, an appropriate journaling function has been set, and the processing is terminated as it is. If not, the process moves to step S801.

  In step S <b> 801, the journal / log recording control unit 206 unmounts the journaling file system and holds it in the file system update data stored on the primary storage device 102 and the journaling area 204 of the secondary storage device 104. Valid journal logs are reflected in the data portion of the secondary storage device 104 (if any). Then, the process proceeds to step S803.

  In step S802, the journal / log recording control unit 206 refers to the operation state correspondence management table 209 to reflect the setting of the journaling function corresponding to the current operation state of the information processing apparatus 100. Mount the journaling file system using.

  Next, details of various tables used for setting and controlling the journaling function in the present embodiment will be described with reference to FIGS. 4, 5, and 6.

  FIG. 4 is a diagram showing an operation state management table 207 managed by the operation state management unit 205. In the operation state management table 207, a mode ID is provided and a plurality of operation modes in which the information processing apparatus transitions are distinguished and managed. In the figure, a normal mode, a data protection mode, a data browsing mode, and a power saving mode (power saving state) are provided.

  The normal mode is an operation state in which the content of the log is less than that in the data protection mode described later while using the journaling function. The data protection mode is an operation mode that places the highest priority on the integrity protection of the secondary storage device. Detects or designates a form of updating personal information stored in the information processing device, important information corresponding to confidentiality, information that affects the operation of the information processing device, such as device settings and FWware update data Based on this, it is regarded as an operation state in which integrity protection is regarded as important, and a data protection mode is set.

  The data browsing mode is an operation mode in which only data stored in the secondary storage device 104 is referred to and data storage on the secondary storage device 104 is not performed. A mode in which a user browses a file recorded on the secondary storage device without editing is referred to as a data browsing mode.

  The power saving mode is a mode in which the operating system 202 operates (prior to shutting down the power), while giving priority to reducing the amount of power consumed when using the functions of the information processing apparatus or operating the apparatus. . The power saving mode is also used when operating with only power from the rechargeable battery without receiving power supply from the main power supply or when no journal log recording is required in the secondary storage device. As a form that does not require journal log recording, it is used when recording information that does not need to be consistent, such as primary data to be deleted, or when the journal information processing device is operated directly by the user until the storage is completed In some cases, power failure may not occur during operation of the information processing apparatus, such as when the uninterruptible power supply (not shown) is functioning.

  A mode is also provided in which the journal log recording control unit 206 does not perform dynamic control of journal log recording. For example, an operation that assumes that the processing load associated with dynamic control of journal log recording contents due to frequent operation of information processing equipment is unacceptable and invalid, or that dynamic control is unnecessary for other reasons Mode.

  As described in the description of steps S800 to S802, the process 201 on the operating system switches the setting of the journaling function according to the usage status of the information processing apparatus 100 in accordance with the operation state management table 207.

  For example, an operation for setting the device by the user is a file operation using the user's setting information as data. Since the importance is high, the operation state of the information processing apparatus is switched to the data protection mode. Similarly, when the operation state management unit 205 detects that a program related to firmware or an operating system is to be updated, the data protection mode may be set.

  Further, when the operation by the user is a device operation that only browses (Reads) a file stored in the secondary storage device 104, the mode is switched to the data browsing mode. When the main power supply is cut and the power supply is switched from the rechargeable battery, the operation state of the information processing apparatus may be switched to the power saving mode. If only the above-described conditions are satisfied, a plurality of operation modes may be adapted depending on the state of the apparatus. For example, the state in which the device setting is performed while the battery is driven satisfies both the data browsing mode and the power saving mode. In the information processing apparatus 100 in which a plurality of operation modes are adapted, priority is given to the modes in advance so that the operation modes can be uniquely determined. For example, the data protection mode has a higher priority than the power saving mode, and the device is switched to the data protection mode when device setting is performed while the battery is driven.

  FIG. 5 shows a journal / log content management table 208 referred to by the journal / log recording control unit 206. In the journal / log content management table 208, the type ID is provided to define the level of detail of the recorded contents of the journal log corresponding to the journaling file system.

  In the figure, there are three stages of recording contents: meta data, data update contents (a part of actual data actually reflected in the data portion), meta data, and no journal log. Note that, like the ordered mode and the writeback mode in the ext3 file system, the file system has journaling functions (log functions) with the same recording contents of the journal log and different recording methods. In this way, when the recorded contents are the same, type IDs corresponding to the functions having different recording methods are added to the journal / log content management table 208, and are defined and distinguished using different type IDs.

  FIG. 6 shows an operation state correspondence management table 209 managed by the journal / log recording control unit 206. The operation state correspondence management table 209 includes a mode ID (indicating the operation state of the information processing apparatus 100) managed by the operation state management table 207 and a type ID (journal log recording setting managed by the journal / log content management table 208). The corresponding relationship is maintained. The contents of the operation state correspondence management table 209 are set in a ROM or the like in the primary storage device 102 when the information processing apparatus 100 is shipped. Of course, it may be set at the time of firmware update via the Internet line or the like, or may be set by the user.

  As described above, in this embodiment, the operation state of the information processing apparatus is managed, and when the predetermined condition is satisfied, the operation state of the information processing apparatus and the use status of the journaling function are confirmed, and the operation state is supported. Switch to the journaling function. As a result, the journaling function can be switched according to the operating state, so that the amount of journal log recording can be suppressed in situations where priority is given to reducing power consumption or in situations where data is mainly referenced. For this reason, a secondary storage device with a limited number of writes, such as a secondary storage device using a NAND flash, is a countermeasure against wear. Of course, even if it is not a NADA flash, in the case of a secondary storage device coated with a magnetic material such as a magnetic disk, the increase in defective blocks due to a decrease in magnetism in the specific sector is reduced by suppressing writing to the specific sector. be able to.

<Embodiment 2>
Hereinafter, the second embodiment will be described in detail with reference to the drawings. In addition, while the same code | symbol is attached | subjected to the structure and process which have the same function as Embodiment 1, the description is abbreviate | omitted about what does not change structurally and functionally. In the present embodiment, the journaling function is more dynamically controlled according to the operation status of the information processing apparatus.

  FIG. 9 is a diagram illustrating a main configuration of the information processing apparatus 100 according to the second embodiment. In addition to the configuration of the first embodiment, a journal / log control unit 901 and a journal / log recording control unit 902 are provided. The journaling file system 900 includes a journal / log control unit 901.

  The journal log control unit 901 holds journal log recording contents, accepts a journaling function change request as an interface to the process 201 on the operating system, and performs journal log recording processing and release in the journal log recording unit 203 Control processing settings.

  The journal / log recording control unit 902 manages various tables so that the journaling file system 900 controls the journaling function using the journal / log control unit 901.

  Next, the journaling function switching procedure in the present embodiment will be described with reference to FIGS. The flow of processing from when the information processing apparatus 100 according to the second embodiment of the present invention is turned on until the journal / log recording content is controlled is the same as that of FIG. 7 of the first embodiment. After mounting the journaling file system, when a certain time interval elapses or when the operation state of the information processing apparatus changes, in step S704, the journal / log recording control unit 902 controls the recording contents of the journal / log as shown in FIG. Do.

  FIG. 10 shows details of the process in step S704 of FIG. 7 in the second embodiment, and is a flowchart showing a process flow in which the journal / log recording control unit 902 controls the setting of the journaling function. Since step S1000 is the same as step S800, description thereof is omitted.

  In step S <b> 1001, the journal / log recording control unit 902 refers to the operation state correspondence management table 209 and designates the journaling function setting corresponding to the current operation state of the information processing apparatus 100 to the journal / log control unit 901. Then, the process proceeds to step S1002. In step S1002, the journal / log control unit 901 controls the journaling function shown in FIG.

  FIG. 11 is a detailed flowchart of step S1002 of FIG. 10, and is a flowchart showing the flow of control of the journaling function by the journal / log control unit 901.

  In step S1100, the journal / log control unit 901 determines whether the setting of the journaling function designated by the journal / log recording control unit 902 matches the current journaling function setting of the file system. If they match, the journaling function setting does not need to be changed, and the process ends. On the other hand, if they do not match, the process moves to step S1101.

  In step S1101, the journal / log control unit 901 determines whether or not the content designated by the journal / log recording control unit 902 is a change to stop journal log recording. If it is determined that the change is for stopping the recording of the journal log, the process proceeds to step S1102, and if not, the process proceeds to step S1105.

  In step S1102, the journal / log control unit 901 stops the journal / log recording process of the journaling file system 900. Specifically, the journal / log control unit 901 issues an instruction to restrict recording of a new journal log to the journal / log recording unit 203. Then, the journal / log control unit 901 updates the setting of the journaling function to “type ID = 2: no journal / log” in the journaling file system 900 held by itself. Then, the process proceeds to step S1103.

  In step S1103, the journal log control unit 901 reflects the valid journal log recorded in the journaling area 204 in the data area on the secondary storage device 104, and releases the reflected journal log. Then, the process proceeds to S1104.

  In step S1104, the journal / log control unit 901 determines whether all valid journal logs recorded in the journaling area 204 have been released. In the case of YES, the process is terminated, and in the case of NO (when there is a journal log that is valid but not released), the process proceeds to step S1103, and journal log release processing is performed.

  In step S1105, the journal / log control unit 901 updates the setting of the journaling function in the journaling file system 900 held by itself. Then, the process proceeds to step S1106. In step S <b> 1106, the journal / log control unit 901 performs journal / log recording processing based on the settings set in the journaling file system 900.

  As described above, in this embodiment, when the setting of the journaling function is changed, the reflection of the reflection of the journal log is suppressed, and the remount processing is not performed as in the journaling file system as in the first embodiment. The journaling function can be switched dynamically.

  In the above-described embodiment, Linux (registered trademark) is used as the OS and ext3 is used as the file system. However, the present invention can also be applied to an operating system other than Linux (registered trademark) and a file system other than ext3. In that case, it is sufficient if there is a configuration in which file operations for the secondary storage device are reflected in multiple stages like a journaling file system.

  Although the details have not been described in the above-described embodiments, the wear leveling function often has different wear leveling algorithms depending on the type of the Flash SSD. Therefore, the presence / absence of the journaling function of the present embodiment may be switched according to whether the wear leveling function is used. For example, when mounting a device with hardware wear leveling such as Flash SSD, the journaling function may be automatically disabled.

  The present invention can also be realized by executing the following processing. That is, a program (program) that realizes the functions of the above-described embodiments is supplied to a system or apparatus via a network or various storage media, and can be read by a computer (or CPU, MPU, etc.) of the system or apparatus. Is read and executed.

101 CPU
DESCRIPTION OF SYMBOLS 102 Primary storage device 103 I / O controller 104 Secondary storage device 203 Journal log recording part 204 Journaling area 205 Operation state management part 206 Journal log recording control part 901 Journal log control part

Claims (18)

An information processing apparatus comprising a storage device,
Write means for writing history data including real data to be written to the first storage area of the storage device or meta data of the real data to the second storage area of the storage device;
Detecting means for detecting a state of the information processing apparatus;
A holding unit that holds a state that the information processing apparatus can take and a setting corresponding to the state;
An information processing apparatus comprising: a control unit that refers to the holding unit and controls the writing unit based on a setting corresponding to a state detected by the detection unit.   The setting includes information indicating a degree of detail of history information written to the second storage area by the writing unit or information indicating whether the history information is written to the second storage area by the writing unit. The information processing apparatus according to claim 1.   The information processing apparatus according to claim 1, wherein the writing unit writes the history information in the second storage area before writing the data in the first storage area of the storage device.   The control unit controls the writing unit so that the history information is not recorded in the second storage area when the detection unit detects that the information processing apparatus is in a power saving state. Item 4. The information processing apparatus according to any one of Items 1 to 3.   When the detection means detects that the history information is not recorded in the second storage area when referring to the information recorded in the storage device, the control means stores the history information in the second storage area. The information processing apparatus according to claim 1, wherein the writing unit is controlled not to record in the storage area.   6. The writing means writes the meta data of a file to be written to the first storage area and the actual data of the file as a journal log which is history information in the second storage area. The information processing apparatus according to any one of the above.   The information processing apparatus according to claim 1, wherein the storage device is a flash SSD.   The information processing apparatus according to claim 1, wherein the storage device is a non-volatile secondary storage device, and further includes a volatile primary storage device separately from the secondary storage device.   The information processing device includes a plurality of states including at least one of a state where the information processing device is in a power saving mode, a state where the information processing device is in a data browsing mode, and a state where the information processing device is in a data protection mode The information processing apparatus according to claim 1, wherein the information processing apparatus transitions to one of the states, and the detection unit detects any one of the plurality of states.   The information processing apparatus according to claim 9, wherein one of the plurality of states is a state in which switching of a control method of the writing unit based on the setting is restricted.   11. The information processing apparatus according to claim 9, further comprising: a journaling mode in which the history information is written in the second storage area as a journal log as one of the plurality of states.   The journaling mode includes a writeback mode, and in the writeback mode, the storage means stores meta data in the journaling area and then stores actual data in a data area other than the journaling area. 11. The information processing apparatus according to 11.   The journaling mode includes an ordered mode, and in the ordered mode, the storage means stores actual data in a data area other than the journaling area and then stores meta data in the journaling area. 11. The information processing apparatus according to 11.   The journaling mode includes a journal mode, in which the storage means stores actual data and meta data in the journaling area and then stores the actual data again in a data area other than the journaling area. The information processing apparatus according to claim 11.   The information processing according to any one of claims 1 to 14, wherein the history information is at least a part of actual data, and the meta data includes management information related to a file held in the storage device. apparatus. An information processing apparatus comprising a storage device,
Writing means for writing a journal log relating to a file operation in the first storage area of the storage device to the second storage area of the storage device before executing the file operation on the first storage area of the storage device; ,
An information processing apparatus comprising: control means for controlling the writing means based on a journaling function setting corresponding to a state of the information processing apparatus. An information processing method by an information processing apparatus including a storage unit and a storage device that hold a state that the information processing apparatus can take and a setting corresponding to the state in association with each other,
A writing step of writing history information including real data to be written to the first storage area of the storage device or meta data related to the actual data to the second storage area of the storage device;
A detection step of detecting a state of the information processing apparatus;
And a control step of controlling the writing step based on a setting corresponding to the state detected in the detection step with reference to the holding means. An information processing apparatus provided with a storage device,
Writing means for writing history data including real data to be written to the first storage area of the storage device or meta data related to the actual data to the second storage area of the storage device;
Detecting means for detecting a state of the information processing apparatus;
A holding unit that holds a state that the information processing apparatus can take and a setting corresponding to the state;
A computer-readable program that functions as control means for controlling the writing means based on a setting corresponding to the state detected by the detection means with reference to the holding means.

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