CN109901795B - Circulating file system and file positioning method - Google Patents
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Abstract
The invention provides a circulating file system and a file positioning method, comprising a fixed data area and an operating data area, wherein the fixed data area is used for storing a Master Boot Record (MBR) and inherent information of a memory where the circulating file system is located; the operation data area comprises a data sub-partition, and the data sub-partition comprises a first index area; the first index area is used for circularly positioning the read-write position of the running data to be read-written in the data sub-partition. By applying the embodiment of the invention, the occupation of the file system to the memory is reduced, and the read-write position is quickly positioned.
Description
Technical Field
The invention relates to the field of file systems, in particular to a circulating file system and a file positioning method.
Background
The file system is a method and data structure used by an operating system to specify files on a storage device (usually a disk, and also a NAND Flash-based solid state disk) or a partition; the File system includes a single File system such as FAT (File Allocation Table), NTFS (New Technology File system), EXT (Extended File system), etc., and the single File system is generally complete in function and good in reliability, and therefore generally complex, and a mount application system needs to occupy a large amount of memory, and also does not have ideal performance for quickly locating a File, and needs to access nodes of each level of the File system, and load and expand internal structures such as FAT tables, clusters, and blocks to locate a final File position for read-write operation.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a circulating file system and a file positioning method so as to reduce the occupation of the file system on a memory and quickly position a read-write position.
The invention is realized by the following steps:
in a first aspect, the present invention provides a rotating file system comprising a fixed data area and an operational data area, wherein,
the fixed data area is used for storing the MBR and the inherent information of the memory where the circulating file system is located;
the operation data area comprises a data sub-partition, and the data sub-partition comprises a first index area; the first index area is used for circularly positioning the read-write position of the running data to be read-written in the data sub-partition.
Optionally, the data sub-partition further includes a data block, and the data block is used for storing running data; the first index area is specifically used for circularly positioning the read-write position of the running data to be read-written in the data block.
Optionally, the first index area includes first atomic pages, each of the first atomic pages includes a first location number and first additional data, the first additional data in the first atomic pages of the first index area respectively correspond to location information of each piece of operating data in the data block, and the first location number is used to uniquely mark a location of the first atomic page.
Optionally, the system further comprises a maintenance data area, the maintenance data area comprises a firmware area and a second index area,
the firmware area is used for storing firmware;
and the second index area is used for circularly positioning and storing the calibration data to be read and written.
Optionally, the system further comprises a status area, the status area comprises a third index area,
and the third index area is used for circularly positioning and storing state data to be read and written.
In a second aspect, the present invention provides a file locating method, which is applied to any one of the above systems, and the method includes:
initializing the circulating file system;
formatting the initialized circulating file system;
circularly positioning the read-write position of the data to be read and written after the data to be read and written in the read-write command is obtained;
and performing read-write operation on the data to be read and written at the read-write position.
Optionally, initializing the circular file system includes:
calling a disk read-write interface;
acquiring an MBR position designated by a user, and setting an initial read-write position of the disk read-write interface according to the MBR position;
allocating a buffer; the buffer area is used for caching the data read and written by the disk read-write interface.
Optionally, formatting the initialized circulating file system includes:
and clearing the first index area in the initialized circulating file system.
Optionally, the first index area of the cyclic file system includes first atomic pages, each first atomic page has a unique first location number, and the cyclic location of the read-write position of the data to be read and written includes:
loading a preset starting page and a preset ending page as a starting page and a ending page respectively; extracting the page number of the starting page and the page number of the final page as the starting page number and the final page number respectively; extracting a first location number of a starting page;
taking the average value of the starting page number and the ending page number as a target page number;
judging whether the target page number is equal to the final page number;
if the target page number is equal to the final page number, determining the final page as a read-write position of data to be read and written;
if the target page number is not equal to the final page number, loading a first atomic page with the target page number as a target page, and extracting a first positioning number of the target page as a target positioning number; judging whether the target location number is larger than a first location number of a starting page or not;
if so, taking the target page as a starting page, taking the target page number as the page number of the starting page, and taking the target positioning number as the first positioning number of the starting page; if not, taking the target page as a final page, and taking the target page number as the page number of the final page;
after the judgment result is executed, updating the target page number to the average value of the page number of the starting page and the page number of the final page; the determination as to whether the target page number is equal to the final page number is re-executed.
The invention has the following beneficial effects: by applying the embodiment of the invention, the whole file system does not need to be loaded, only each data area contained in the file system needs to be loaded, and the memory occupied by the file system is small, so that the occupation of the memory by the file system is reduced, the read-write position of the data to be read and written can be quickly positioned through the first index area, the read-write speed is improved, in addition, the first index area can realize circular positioning, the data blocks can realize circular storage, the read-write operation can be completely balanced, and the service life of the storage is prolonged.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a circular file system according to an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of an operation data area according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of another structure of an operation data area according to an embodiment of the present invention;
fig. 4 is a flowchart illustrating a file locating method according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In order to solve the problems in the prior art, embodiments of the present invention provide a circular file system and a file positioning method.
Referring to fig. 1, fig. 1 is a circular file system according to an embodiment of the present invention, which includes a fixed data area and a running data area, wherein,
the fixed data area 11 is used for storing the MBR and the inherent information of the memory where the circulating file system is located;
the operation data area comprises a data sub-partition 121, and the data sub-partition comprises a first index area 1210 which is used for circularly positioning the read-write position of the operation data to be read-written in the data sub-partition.
In yet another implementation, the data sub-partition may further include a data block 1211, where the data block 1211 is used to store the running data; the first index area 1210 is specifically configured to circularly locate a read-write position of the operation data to be read-written in the data block.
The circulating file system of the present invention may be operated in an electronic device, where the electronic device may include a Memory, the fixed area may store data that needs to be permanently and fixedly stored in the Memory, and the data may be written into the fixed area in the Memory of the electronic device after the electronic device leaves a factory, and the Memory may include a Random Access Memory (RAM), and may also include a Non-Volatile Memory (NVM, disk Memory, etc.).
The fixed area may include two parts for storing MBR (master Boot Record) and intrinsic information, respectively, and the MBR may include memory information, partition description information, such as a model number and a size of the memory, a location and a size of each partition, and the like; the inherent information may include a specification model number, a serial number, and the like of the electronic device.
As shown in fig. 2, the operation data area 12 may include one or more data sub-partitions 121, and each data sub-partition 121 may include a first index area 1210 and a data block 1211, where the data block is used to cyclically store test data detected by an electronic device during operation, such as a battery tester, a tachograph, a detector, a video monitoring device, and the like.
As shown in fig. 3, the run data area 12 may include one or more data sub-partitions, each of which may include a first index area 1210 and a data block 1211, the first index area 1210 may include one or more first atomic pages, partition in fig. 3 indicates an x-th data block, FASTPAGEn + x indicates an x-th first atomic page, each of the first atomic pages may include a first location number FID and a first additional data ITEM, the first additional data in the first atomic pages of the first index area respectively correspond to location information of the run data in the data block, and the first location number is used to uniquely mark a location of the first atomic page.
The first index area can be regarded as an index structure, the first positioning number can be a continuous positive integer and is increased progressively along with the increase of the first atomic pages, and the range of the first positioning number can be preset according to requirements as long as the total number of the first atomic pages is ensured not to exceed the whole life cycle. The first additional data may include execution data of one or more applications, and the execution data of each application may be uniquely marked with an application number.
The position of the first atomic page to be read and written can be rapidly determined by utilizing the first positioning number, and then, the read and write operation can be rapidly performed on the data to be read and written at the position appointed by the first additional data in the first atomic page.
The position information may include a position start value and an offset; alternatively, the location information comprises an access pointer for pointing to a location. A certain position area in the data block can be determined through the position starting value and the offset, and the certain position area in the data block can be quickly accessed through the access pointer.
The first index area may circularly locate a read-write position of the running data to be read-written in the data block, and may be: and when the whole first index area is used up, if new running data to be read and written is obtained, reading and writing are started from the first atomic page again, so that the data block can circularly store the running data to be read and written.
In one implementation, the system may further include a maintenance data area including a firmware area and a second index area,
the firmware area is used for storing firmware;
and the second index area is used for circularly positioning and storing the calibration data to be read and written.
The firmware refers to a device driver stored in the device, and through the firmware, the operating system can implement operation according to a standard device driver, for example, the optical disc drive and the recorder have internal firmware. Firmware is the most basic software of a system, and can determine the functions and performances of hardware devices. The firmware area may be used to store firmware in the electronic device, may be encrypted firmware or non-encrypted firmware, and may perform read-write operation on the firmware area whenever firmware upgrade is required.
The second index area and the first index area can have the same structural form, only the stored data content is different, the maintenance data area can comprise one or more second index areas, each second index area can comprise one or more second atomic pages, each second atomic page can comprise a second positioning number and second additional data, the second additional data in the second atomic pages of the second index areas respectively store the calibration data of the electronic device, and the second positioning numbers are used for uniquely marking the positions of the second atomic pages. The calibration data includes calibration information, calibration logs, and the like for calibrating the device. The calibration data may be used to modify the raw test data of the electronic device, thereby improving the test accuracy of the electronic device. And after the calibration data to be read and written are obtained, circularly positioning the operation position of the calibration data through the second index area, and performing read-write operation or storage on the calibration data at the operation position.
The system may further include a status area, the status area including a third index area,
and the third index area is used for circularly positioning and storing state data to be read and written.
The third index area and the first index area may have the same structure form, except that the stored data content is different, the status area may include one or more third index areas, each third index area may include one or more third atomic pages, each third atomic page may include a third location number and third additional data, the third additional data in each third atomic page of the third index area respectively stores status data of the device, and the third location number is used for uniquely marking the position of the third atomic page.
The status data may include historical usage status of the device, such as type of most recent test data, progress of the test, and the like. The state data can be generated in the running process of the electronic equipment, after the state data is obtained, the operating position of the state data can be located in a circulating mode through the third index area, and the state data is read and written or stored in the operating position.
By applying the embodiment of the invention, the whole file system does not need to be loaded, only each data area contained in the file system needs to be loaded, and the memory occupied by the file system is small, so that the occupation of the memory by the file system is reduced, the read-write position of the data to be read and written can be quickly positioned through the first index area, the read-write speed is improved, in addition, the first index area can realize circular positioning, the data blocks can realize circular storage, the read-write operation can be completely balanced, and the service life of the memory is prolonged.
Corresponding to the foregoing embodiment of the circulating file system, an embodiment of the present invention provides a file locating method, as shown in fig. 4, applied to the foregoing circulating file system, where the method includes:
s101, initializing the circulating file system;
s102, formatting the initialized circulating file system;
s103, circularly positioning the read-write position of the data to be read and written after the data to be read and written in the read-write command is obtained;
and S104, performing read-write operation on the data to be read and written at the read-write position.
After the electronic device detects that new data needs to be stored or detects a modification command that needs to modify previously stored data, it may be determined to obtain a read-write command, where the read-write command may include data to be read and written.
By applying the embodiment of the invention, the whole file system does not need to be loaded, only each data area contained in the file system needs to be loaded, and the memory occupied by the file system is small, so that the occupation of the memory by the file system is reduced, the read-write position of the data to be read and written can be quickly positioned through the first index area, the read-write speed is improved, in addition, the first index area can realize circular positioning, the data blocks can realize circular storage, the read-write operation can be completely balanced, and the service life of the storage is prolonged.
Initializing the circulating file system may include:
calling a disk read-write interface;
acquiring an MBR position designated by a user, and setting an initial read-write position of the disk read-write interface according to the MBR position;
allocating a buffer; the buffer area is used for caching the data read and written by the disk read-write interface.
The disk read-write interface can perform read-write operation on the disk space in the memory. The MBR position may be a position specified by a user according to an actual situation, and the disk read-write interface may start to prepare for read-write operation from the MBR position. The buffer area can be an area allocated from the memory, and the read-write operation process can be accelerated by setting the buffer area. The starting page position of each partition can be determined according to the MBR position, so that the position of a certain starting page can be set as the initial read-write position of the disk read-write interface.
In one implementation, formatting the initialized circular file system may include:
and clearing the first index area in the initialized circulating file system.
If the circular file system further includes a maintenance data area and a status area, the formatting process may further include clearing the second index area in the maintenance data area and the third index area in the status area. In order to facilitate the viewing of the completion progress of the formatting process, a progress report callback function may be added, and the completion progress of the formatting process is obtained by executing the function.
In one implementation, a first index area of a circular file system includes first atomic pages, each first atomic page has a unique first location number, and cyclically locates a read-write location of data to be read and written, including:
loading a preset starting page and a preset ending page as a starting page and a ending page respectively; extracting the page number of the starting page and the page number of the final page as the starting page number and the final page number respectively; extracting a first location number of a starting page;
taking the average value of the starting page number and the ending page number as a target page number;
judging whether the target page number is equal to the final page number;
if the target page number is equal to the final page number, determining the final page as a read-write position of data to be read and written;
if the target page number is not equal to the final page number, loading a first atomic page with the target page number as a target page, and extracting a first positioning number of the target page as a target positioning number; extracting a first location number of a starting page; judging whether the target positioning number is larger than a first positioning number of the starting page or not;
if so, taking the target page as a starting page, taking the target page number as the page number of the starting page, and taking the target positioning number as the first positioning number of the starting page; if not, taking the target page as a final page, and taking the target page number as the page number of the final page;
after the judgment result is executed, updating the target page number to the average value of the page number of the starting page and the page number of the final page; the determination as to whether the target page number is equal to the final page number is re-executed.
The data to be read and written may be running data, calibration data, status data, etc. sequentially generated according to time, such as test data generated by electronic devices such as a video recorder, a monitoring recorder, a test recorder, a precision battery tester, etc. over time during the test process.
It is to be understood that if the first index region has just completed formatting, then the first location numbers of all the first atomic pages of that region are all 0; because the positioning judgment depends on whether the target position number is larger than the first position number of the starting page or not, only the execution of the 'no' item is entered in the all 0 state, namely, the target page is taken as the final page, the target page number is taken as the page number of the final page, and the cycle exits until the page numbers of the final starting page, the target page and the final page are overlapped;
if the first index area is used for a period of time and is not fully used, the first location number of a part of the first atomic page is 0;
if the target page falls in the unused area, the target location number is 0, and the target location number is not greater than the location number of the starting page; in the positioning judgment, the execution of a 'no' item is entered, namely, the target page is taken as a final page, and the target page number is taken as the page number of the final page;
if the target page falls in the used area, because the first positioning number is a continuous positive integer, the first positioning number at the back is larger than that at the front, therefore, the target positioning number is larger than that of the starting page, and in the positioning judgment, the execution of a 'yes' item is entered, namely, the target page is taken as the starting page, the target page number is taken as the page number of the starting page, and the target positioning number is taken as the first positioning number of the starting page; the circulation is quitted until the page numbers of the final starting page, the target page and the final page are overlapped;
if the equipment is used for a long time, the whole first index area is used up, and the first atomic page enters a recycling state;
if the target location number is larger than the first location number of the starting page, the target page can be used as the starting page, the target page number is used as the page number of the starting page, and the target location number is used as the first location number of the starting page after the currently located target page of the final target page for recycling is shown;
if the target index number is not larger than the first index number of the starting page, based on the principle of sequential recycling, the final target page is between the starting page and the currently positioned target page, the target page can be used as the final page, and the target page number is used as the page number of the final page;
and exiting the cycle until the page numbers of the final starting page, the target page and the final page are overlapped.
Therefore, no matter which using state the first index area is in, the reading and writing position of the data to be read and written can be accurately positioned, the searching range of each positioning is reduced by half, the time consumed by positioning is saved, and the rapid positioning is realized. The second index area and the third index area can determine the read-write position of the data to be read and written by adopting the same positioning mode.
The reading and writing position can be quickly positioned through the first atomic page, and the first atomic page can be directly used or used in an index way; the direct use is that the data to be read and written is stored in the first additional data; the index use is to store an index or a pointer in the first additional data, so that the index or the pointer locates the true data storage position; the additional data segment can also store some characteristic data, and the data storage position is located by the characteristic data, and the characteristic data can describe the characteristics of the data and has uniqueness, and can include the size, creation time, data category and the like of the data.
Similarly, the second atomic page and the third atomic page can be used directly or by indexing.
The invention does not limit the specific read-write operation mode, the read-write mode can be different according to different memories, and the read-write operation can be carried out by using the interface and the operation method provided by the memory manufacturer.
The present invention is not limited to the above preferred embodiments, and any modifications, equivalent substitutions, improvements, etc. within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (6)
1. A circular file system comprising a fixed data area and an operating data area, wherein,
the fixed data area is used for storing the MBR and the inherent information of the memory where the circulating file system is located;
the operation data area comprises one or more data sub-partitions, and the data sub-partitions comprise a first index area; the first index area is used for circularly positioning the read-write position of the running data to be read-written in the data sub-partition;
the data sub-partition further comprises a data block, and the data block is used for storing running data; the first index area is specifically used for circularly positioning the read-write position of the running data to be read-written in the data block;
the first index area comprises first atomic pages, each first atomic page comprises a first positioning number and first additional data, the first additional data in the first atomic pages of the first index area respectively correspond to the position information of the running data in the data block, and the first positioning number is used for uniquely marking the position of the first atomic page.
2. The system of claim 1, further comprising a maintenance data area, the maintenance data area comprising a firmware area and a second index area,
the firmware area is used for storing firmware;
and the second index area is used for circularly positioning and storing the calibration data to be read and written.
3. The system of claim 1, further comprising a status region, the status region comprising a third index region,
and the third index area is used for circularly positioning and storing state data to be read and written.
4. A file locating method applied to the system of claim 1, the method comprising:
initializing the circulating file system;
formatting the initialized circulating file system;
circularly positioning the read-write position of the data to be read and written after the data to be read and written in the read-write command is obtained;
performing read-write operation on data to be read and written at the read-write position;
wherein, the first index area of the circulating file system comprises first atomic pages, each first atomic page has a unique first positioning number, and the circulating positioning of the read-write position of the data to be read and written comprises:
loading a preset starting page and a preset ending page as a starting page and a ending page respectively; extracting the page number of the starting page and the page number of the final page as the starting page number and the final page number respectively; extracting a first location number of a starting page;
taking the average value of the starting page number and the ending page number as a target page number;
judging whether the target page number is equal to the final page number;
if the target page number is equal to the final page number, determining the final page as a read-write position of data to be read and written;
if the target page number is not equal to the final page number, loading a first atomic page with the target page number as a target page, and extracting a first positioning number of the target page as a target positioning number; judging whether the target location number is larger than a first location number of a starting page or not;
if so, taking the target page as a starting page, taking the target page number as the page number of the starting page, and taking the target positioning number as the first positioning number of the starting page; if not, taking the target page as a final page, and taking the target page number as the page number of the final page;
after the judgment result is executed, updating the target page number to the average value of the page number of the starting page and the page number of the final page; the determination as to whether the target page number is equal to the final page number is re-executed.
5. The method of claim 4, wherein initializing the circulating file system comprises:
calling a disk read-write interface;
acquiring an MBR position designated by a user, and setting an initial read-write position of the disk read-write interface according to the MBR position;
allocating a buffer; the buffer area is used for caching the data read and written by the disk read-write interface.
6. The method of claim 4, wherein formatting the initialized circulating file system comprises:
and clearing the first index area in the initialized circulating file system.
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