CN100507873C - FLASH document management method and system in FLASH memory - Google Patents
FLASH document management method and system in FLASH memory Download PDFInfo
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- CN100507873C CN100507873C CNB2006101042897A CN200610104289A CN100507873C CN 100507873 C CN100507873 C CN 100507873C CN B2006101042897 A CNB2006101042897 A CN B2006101042897A CN 200610104289 A CN200610104289 A CN 200610104289A CN 100507873 C CN100507873 C CN 100507873C
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Abstract
The disclosed management method for file in FLASH comprises: building index as the first attribute of FLASH file, operating the file by user as the index. This invention overcomes the defect in prior art, eliminates potential threat, and has well stability and generality.
Description
Technical field
The present invention relates to a kind of file management method and system, the management method and the system of the FLASH file in particularly a kind of flash memory.
Background technology
The FLASH file system is as the term suggests be exactly the file system that adopts flash memory FLASH to realize as external storage.Therefore, the realization of FLASH file system just must be considered the characteristics of flash memories.Flash memories since have that memory capacity is big, the power down data are not lost and can be repeatedly erasable etc. many advantages, just progressively replace other semiconductor storage unit and be widely used in the mobile electronic products such as mobile phone, personal digital assistant and digital camera.It can move mass data and exchange quickly and easily as the memory bank of storage data and application program.
The FLASH file system is used for quantity of documents occasion few and simple to operate more, as mobile phone, communication facilities etc.On this type of was used, quantity of documents was few, and scale is also less, but also needs basic file operation function, under this demand, has produced the FLASH simple file system.The notion of FLASH file system has nothing different with file system in general sense, and the user can open easily, closes, the reading and writing file data.But space that the FLASH file system is managed and quantity of documents all are far smaller than tape file system of institute of general operation system, so its realization should be in line with simple, practical, stable principle.
Prior art when using the FLASH file, a kind of be adopt operating system with file system.But its deficiency is: not all operating system with file system can be applicable to flash memory; Simultaneously because the FLASH file needs the dynamic assignment file space, easily produce space junk, this is because the bottom technology of flash memory does not allow the arbitrary address space in the flash memory deleted, but be unit deletion according to the sector, for this reason in file of deletion, temporary transient not the shared space deletion of whole file, only be in the sign of file header, to make a deletion sign, and be retained in the flash memory.Like this, when deleted file runs up to certain quantity, will take sizable space.The system flash space that need arrange the document is reused the deleted file occupation space.So this technical scheme needs extra administration overhead, this is not only unnecessary but also unstable for quantity of documents application seldom.
The another kind of technical scheme of prior art is not use file system, directly calls the read-write interface service data that the FLASH file drives.But the deficiency that exists under this scheme is: use inconvenience, and lack the function of a lot of file operations; Owing to directly call the driving interface of FLASH file bottom, the security of flash memory also there is potential threat.
Summary of the invention
The invention provides the management method and the system of the FLASH file in a kind of flash memory, need the dynamic assignment file space in order to solve the FLASH file that exists in the prior art, easily produce space junk, cause the unnecessary also problem of unstable brought because of additional management, also further solve FLASH file use inconvenience, dumb in the prior art, and lack the deficiency of the function of a lot of file operations; Also solve owing to directly call the driving interface of FLASH file bottom the potential threat that the security of flash memory is had.
The management method of the FLASH file in the flash memory provided by the invention comprises the steps:
Set up index according to FLASH file first attribute, the preservation position of described index record this document in flash memory, described index is not saved in the flash memory and dynamically reads at every turn;
The user operates the FLASH file by described index.
Preferably, described FLASH file first attribute is file size and/or filename and/or start address and/or directory name.
Preferably, described index static programming in code is set up, and/or sets up before file system initialization.
Preferably, further comprise the steps: in described index, to set up the basic handle of file for each FLASH file, in described index, set up the basic handle of user for each FLASH file according to the 3rd attribute of each FLASH file according to second attribute of each FLASH file;
Described user operates the FLASH file according to the basic handle of the file in the described index after by the basic handle acquisition of the user in the described index FLASH file being carried out operation permission.
Preferably, described second attribute is physical length and/or lock sign and/or number of users and/or user ID array and/or buffer area pointer and/or FLASH sign.
Preferably, described the 3rd attribute is task sign and/or user ID and/or access module and/or file pointer.
Preferably, further comprise the steps: and not need permanent data of preserving to be saved to random access memory in the FLASH file.
Preferably, further comprise the steps: to be FLASH file package file operation driving interface; The user operates the FLASH file by described driving interface.
Preferably, described file operation is to create file and/or open file and/or close file and/or read file and/or written document and/or locating file and/or reorientation file pointer and/or deleted file and/or file rename and/or obtain file size.
Preferably, described operating writing-file is to return after file is write flash memory, or returns the back immediately and play a task on the backstage and be used for file is write flash memory.
The present invention also provides the management system of the FLASH file in a kind of flash memory, comprising:
Detection module detects the FLASH file attribute in the flash memory;
Index module is set up index according to FLASH file first attribute, the preservation position of described index record this document in flash memory, and described index is not saved in the flash memory and dynamically reads at every turn, and the user operates the FLASH file by described index.
Preferably, described index module further comprises:
First indexing units is used for setting up file basic handle for each FLASH file at described index according to second attribute of each FLASH file;
Second indexing units is used for setting up user basic handle for each FLASH file at described index according to the 3rd attribute of each FLASH file;
Described user operates the FLASH file according to the basic handle of the file in the described index after by the basic handle acquisition of the user in the described index FLASH file being carried out operation permission.
Preferably, further comprise:
Memory module is used for not needing permanent data of preserving to be saved to random access memory the FLASH file.
Preferably, further comprise:
The interface package module is used to FLASH file package file operation driving interface;
The user operates the FLASH file by described driving interface.
Beneficial effect of the present invention is as follows:
Owing to adopted the mode of index among the present invention, make flash memory space can carry out static division, do not need dynamic management, therefore has good stability, avoided the FLASH file to need the dynamic assignment file space, easily produce space junk, cause the unsettled deficiency of bringing because of additional management.
Also further among the present invention with FLASH file and the memory file space unified management of making of random access memory ram, thus good dirigibility had.
The normative document access interface also is provided among the present invention, and therefore use does not need to make special change for this reason;
Also FLASH safety of files and reliability have been increased among the present invention by encapsulation flash memory bottom layer driving;
Obviously, file system simplicity of design, practicality in the present invention do not have unnecessary function, good stability; Simultaneously also have good versatility, can be applied to much use the occasion of flash memory as file storage.
Description of drawings
Fig. 1 is the implementing procedure synoptic diagram of FLASH file management method in the flash memory described in the embodiment;
Fig. 2 is the structural representation of FLASH file space described in the embodiment;
Fig. 3 is the structural representation of file index table described in the embodiment;
Fig. 4 is a file handle synoptic diagram described in the embodiment;
Fig. 5 is the synoptic diagram of FLASH file interface described in the embodiment;
Fig. 6 is the structural representation of FLASH file management system in the flash memory described in the embodiment.
Embodiment
The present invention simplifies implementation according to the application on the flash memory, the space of All Files on the static programming flash memory, and unified management, thus reach simple, practical, stable purpose.The present invention also will provide the All Files basic function that system is possessed, comprise file establishment, open, close, reading and writing, delete, search, location etc.Below in conjunction with accompanying drawing concrete enforcement of the present invention is made an explanation.
Fig. 1 is the implementing procedure synoptic diagram of the management method of the FLASH file in the flash memory of the present invention, and as shown in the figure, the flow process of enforcement is:
FLASH file in S101, the detection flash memory;
Mainly be to collect all necessary files on the flash memory in this step, and determine the maximum length of file according to the user demand of file, with this as the spatial division of this document on flash memory.Be the file headspace do not use now, may use in the future, for the requirement that upgrading later on etc. may occur is prepared.Fig. 2 is a FLASH file space structural representation, the spatial division of flash memory as shown in the figure, the storage of file on flash memory divides two parts, a part is the file mark head, whether log file exists, file size etc., another part is a file itself.
In preferred the enforcement, the data that need not preserve in the FLASH file can be saved to RAM.This is to consider that some file do not want long preservation, only is used for depositing temporarily, plans that a memory field with RAM does unified management together as a part and the flash memory in file management system space.This is because the write operation of flash memories is then different with general storer, the write operation of flash memory must be earlier by memory block erasing (writing 0xff in the memory cell block that will wipe), write in proper order by page or leaf again, because flash memories is wiped consuming time longer, so the time that flash memories writes mainly is the erase operation of flash memories inside etc., and the memory field file can be frequently erasable, has the advantage that flash memory does not possess, but it can not forever be preserved, therefore for the interim decompressing files that uses in the FLASH file, last download transition file etc. has effectiveness.FLASH file and memory file combination are carried out unified space management, make the present invention possess good dirigibility.
S102, set up index according to FLASH file first attribute;
Because the mode of setting up index is diversified, such as by mapping relations, set up index database, the corresponding relation or the like that connects, be that example describes so only set up index with the file index table.The design document concordance list is according to FLASH file first attribute in the flash memory, and first attribute can comprise parameters such as the maximum length, directory name, filename, FLASH start address of file.Can locating file by the file index table, obtain file attribute.Because the present invention is the static allocation flash memory space, so this concordance list is not saved in the flash memory and dynamically reads at every turn, there is potential danger because dynamically read concordance list, therefore the file index table can be in code static programming, also can realize by before file system initialization, redistributing.Fig. 3 is the structural representation of file index table, and file concordance list structure has comprised maximum length, start address, filename, directory name, file handle as shown in the figure among the embodiment.Wherein file handle uses in another preferred embodiment, will the embodiment of file handle be described below.
S103, in described index, set up the basic handle of file for each FLASH file according to second attribute of each FLASH file;
S104, in described index, set up the basic handle of user for each FLASH file according to the 3rd attribute of each FLASH file;
In above-mentioned file handle, comprise basic handle of file and the basic handle of user, the basic handle of design document and the basic handle of user time-division not according to second attribute and the 3rd attribute, second attribute of basic handle of file and file is corresponding one by one, all important attribute of log file comprise file size, lock sign, buffer memory, user ID or the like.The basic handle of user is corresponding to user's the 3rd attribute, and each file can be opened simultaneously by a plurality of users, and the basic handle of user is used to the access file that guarantees that a plurality of users do not conflict.All from obtaining handle, it is legal that handle mechanism has ensured the handling safety of file for operation file.Creating file and opening file is exactly the interface that distributes handle, and close file is the interface of releasing handle.Fig. 4 is the file handle synoptic diagram, the file handle structure as shown in Figure 4, wherein the basic handle content of file comprises file physical length, lock sign, number of users, user ID array, buffer area pointer, FLASH sign or the like, and the basic handle content of user then comprises contents such as task sign, user ID, access module, file pointer.
S105, be FLASH file package file operation driving interface;
Encapsulation FLASH file operation driving interface is for the interface of file operation is provided, improve its ease for use and versatility, these operations comprise create file, open file, close file, read file, written document, locating file, reorientation file pointer, deleted file, file rename, obtain file size or the like.Wherein, operating writing-file adopts caching mechanism, both can also can adopt unblock formula (return immediately, the backstage is played a task and is used to write flash memory) with block type (just returning after writing flash memory).Can do corresponding selection according to the difference of using.Fig. 5 is a FLASH file interface synoptic diagram, as shown in the figure, the interface that externally provides of simple file system can have: create file (SFS_Create), (SFS_Open) opens file, close file (SFS_Close), read file (SFS_Read), written document (SFS_Write), locating file (SFS_Find), reorientation file pointer (SFS_Lseek), deleted file (SFS_Deletefile), file rename (SFS_Rename), obtain file size (SFS_Filelength), search first file (SFS_Findfirst), search next file (SFS_Findnext), search and close the file of opening (SFS_Findclose), move (SFS_Movefile), obtain File Open pattern (SFS_Getfilemode), obtain file attribute interfaces such as (SFS_Fsattrib).The user just can operate the FLASH file easily by these driving interface.
Based on same inventive concept, the present invention also provides the management system of the FLASH file in a kind of flash memory, below in conjunction with accompanying drawing the enforcement of native system is made an explanation.
Fig. 6 is the structural representation of FLASH file management system in the flash memory of the present invention, as shown in the figure, comprise in the system: detection module 601, index module 602, memory module 603, interface package module 604 can further include first indexing units, second indexing units in index module 602.Below the concrete enforcement of each module is made an explanation.
Behind the FLASH file attribute in the detection module detection flash memory, index module is set up index according to FLASH file first attribute, and the user operates the FLASH file by index.
Collect all necessary files on the flash memory, and determine the maximum length of file according to the user demand of file, with this as the spatial division of this document on flash memory.Be the file headspace do not use now, may use in the future, for the requirement that upgrading later on etc. may occur is prepared.The storage of file on flash memory divides two parts, and a part is the file mark head, and whether log file exists, file size etc., and another part is a file itself.
Because the mode of setting up index is diversified, so following equally only to set up index with the file index table be that example describes.The design document concordance list is according to file first attribute that is write down, and first attribute can comprise parameters such as maximum length, directory name, filename, FLASH start address.Can locating file by the file index table, obtain file attribute.Because the present invention is the static allocation flash memory space, so this concordance list is not saved in the flash memory and dynamically reads at every turn, have potential danger because dynamically read concordance list, thus the file index table can be in code static programming, also can before file system initialization, redistribute.File concordance list structure has comprised maximum length, start address, filename, directory name, file handle among the embodiment.Wherein file handle uses in a preferred embodiment, will the embodiment of file handle be described below.
In preferred the enforcement, first indexing units is used for setting up file basic handle for each FLASH file at described index according to second attribute of each FLASH file in the index module; Second indexing units is used for setting up user basic handle for each FLASH file at described index according to the 3rd attribute of each FLASH file;
The user operates the FLASH file according to the basic handle of the file in the index after by the basic handle acquisition of the user in the index FLASH file being carried out operation permission.
In above-mentioned file handle, comprise basic handle of file and the basic handle of user, the basic handle of design document and the basic handle of user time-division not according to second attribute and the 3rd attribute, second attribute of basic handle of file and file is corresponding one by one, the important attribute of log file comprises file size, lock sign, buffer memory, user ID or the like.The basic handle of user is corresponding to user's the 3rd attribute, and each file can be opened simultaneously by a plurality of users, and the basic handle of user is used to the access file that guarantees that a plurality of users do not conflict.All from obtaining handle, it is legal that handle mechanism has ensured the handling safety of file for operation file.Creating file and opening file is exactly the interface that distributes handle, and close file is the interface of releasing handle.Wherein the basic handle content of file comprises file physical length, lock sign, number of users, user ID array, buffer area pointer, FLASH sign or the like, and the basic handle content of user then comprises contents such as task sign, user ID, access module, file pointer.
In preferred the enforcement, memory module is used for the data that the FLASH file need not be preserved are saved to random access memory ram.
The data that need not preserve in the FLASH file can be saved to RAM.This is to consider that some file do not want long preservation, only is used for depositing temporarily, plans that a memory field with RAM does unified management together as a part and the flash memory in file management system space.This is because the write operation of flash memories is then different with general storer, the write operation of flash memory must be earlier by memory block erasing (writing 0xff in the memory cell block that will wipe), write in proper order by page or leaf again, because flash memories is wiped consuming time longer, so the time that flash memories writes mainly is the erase operation of flash memories inside etc., and the memory field file can be frequently erasable, has the advantage that flash memory does not possess, but it can not forever be preserved, therefore for interim decompressing files, on download transition file etc. and have effectiveness.FLASH file and memory file combination are carried out unified space management, make the present invention possess good dirigibility.
In preferred the enforcement, can further include the interface package module and be used to FLASH file package file operation driving interface; The user operates the FLASH file by driving interface.
Encapsulation FLASH file operation driving interface is for the interface of file operation is provided, improve its ease for use and versatility, these operations comprise create file, open file, close file, read file, written document, locating file, reorientation file pointer, deleted file, file rename, obtain file size or the like.Wherein, operating writing-file adopts caching mechanism, both can also can adopt unblock formula (return immediately, the backstage is played a task and is used to write flash memory) with block type (just returning after writing flash memory).Can do corresponding selection according to the difference of using.The interface that simple file system externally provides can have: create file (SFS_Create), (SFS_Open) opens file, close file (SFS_Close), read file (SFS_Read), written document (SFS_Write), locating file (SFS_Find), reorientation file pointer (SFS_Lseek), deleted file (SFS_Deletefile), file rename (SFS_Rename), obtain file size (SFS_Filelength), search first file (SFS_Findfirst), search next file (SFS_Findnext), search and close the file of opening (SFS_Findclose), move (SFS_Movefile), obtain File Open pattern (SFS_Getfilemode), obtain file attribute interfaces such as (SFS_Fsattrib).The user just can operate the FLASH file easily by these driving interface.
By above-mentioned enforcement, the normative document access interface is provided among the present invention as can be seen, use does not need to make special change for this reason; Encapsulation FLASH bottom layer driving increases security and reliability; File system simplicity of design, practicality do not have unnecessary function, good stability; Versatility is good, can be applied to much use the occasion of flash memory as file storage.
Obviously, those skilled in the art can carry out various changes and modification to the present invention and not break away from the spirit and scope of the present invention.Like this, if of the present invention these are revised and modification belongs within the scope of claim of the present invention and equivalent technologies thereof, then the present invention also is intended to comprise these changes and modification interior.
Claims (14)
1, the management method of the FLASH file in a kind of flash memory is characterized in that, comprises the steps:
Set up index according to FLASH file first attribute, the preservation position of described index record this document in flash memory, described index is used for the static allocation flash memory space;
The user operates the FLASH file according to described index.
2, the method for claim 1 is characterized in that, described FLASH file first attribute is file size and/or filename and/or start address and/or directory name.
3, the method for claim 1 is characterized in that, described index static programming in code is set up, and/or sets up before file system initialization.
4, the method for claim 1 is characterized in that, further comprises:
Second attribute according to each FLASH file is set up the basic handle of file for each FLASH file in described index, set up the basic handle of user according to the 3rd attribute of each FLASH file for each FLASH file in described index;
Described user operates the FLASH file according to the basic handle of the file in the described index after according to the basic handle acquisition of the user in the described index FLASH file being carried out operation permission.
5, method as claimed in claim 4 is characterized in that, described second attribute is physical length and/or lock sign and/or number of users and/or user ID array and/or buffer area pointer and/or FLASH sign.
6, method as claimed in claim 4 is characterized in that, described the 3rd attribute is task sign and/or user ID and/or access module and/or file pointer.
7, the method for claim 1 is characterized in that, further comprises the steps:
To not need permanent data of preserving to be saved to random access memory in the FLASH file.
8, the method for claim 1 is characterized in that, further comprises the steps:
Be FLASH file package file operation driving interface;
The user operates the FLASH file by described driving interface.
9, method as claimed in claim 8, it is characterized in that described file operation is to create file and/or open file and/or close file and/or read file and/or written document and/or locating file and/or reorientation file pointer and/or deleted file and/or file rename and/or obtain file size.
10, method as claimed in claim 9 is characterized in that, described operating writing-file is to return after file is write flash memory, or returns the back immediately and play a task on the backstage and be used for file is write flash memory.
11, the management system of the FLASH file in a kind of flash memory is characterized in that, comprising:
Index module is set up index according to FLASH file first attribute, the preservation position of described index record this document in flash memory, and described index is used for the static allocation flash memory space, and the user operates the FLASH file by described index.
12, system as claimed in claim 11 is characterized in that, described index module further comprises:
First indexing units is used for setting up file basic handle for each FLASH file at described index according to second attribute of each FLASH file;
Second indexing units is used for setting up user basic handle for each FLASH file at described index according to the 3rd attribute of each FLASH file;
Described user operates the FLASH file according to the basic handle of the file in the described index after by the basic handle acquisition of the user in the described index FLASH file being carried out operation permission.
13, system as claimed in claim 11 is characterized in that, further comprises:
Memory module is used for not needing permanent data of preserving to be saved to random access memory the FLASH file.
14, system as claimed in claim 11 is characterized in that, further comprises:
The interface package module is used to FLASH file package file operation driving interface;
The user operates the FLASH file by described driving interface.
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| Application Number | Priority Date | Filing Date | Title |
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| CNB2006101042897A CN100507873C (en) | 2006-08-09 | 2006-08-09 | FLASH document management method and system in FLASH memory |
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| CNB2006101042897A CN100507873C (en) | 2006-08-09 | 2006-08-09 | FLASH document management method and system in FLASH memory |
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| CN100507873C true CN100507873C (en) | 2009-07-01 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101901263A (en) * | 2010-07-22 | 2010-12-01 | 华为终端有限公司 | Access method and device of file system |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101751446A (en) | 2008-12-17 | 2010-06-23 | 深圳富泰宏精密工业有限公司 | File management system of flash memory and file management method thereof |
| CN101692211B (en) * | 2009-09-15 | 2011-08-10 | 苏州超锐微电子有限公司 | Method for managing Flash data |
| CN102375850B (en) * | 2010-08-23 | 2013-10-30 | 联想(北京)有限公司 | File arrangement method and starting method of electronic equipment and electronic equipment |
| CN102053879A (en) * | 2010-12-16 | 2011-05-11 | 国网电力科学研究院 | Self-recovery real-time file system based on FLASH |
| CN102129476B (en) * | 2011-04-22 | 2013-01-16 | 上海网达软件股份有限公司 | Application of virtual file system by utilizing ZIP compression format |
| CN104391952A (en) * | 2014-11-28 | 2015-03-04 | 公安部第三研究所 | File system index establishing method and file system query implementing method |
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2006
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101901263A (en) * | 2010-07-22 | 2010-12-01 | 华为终端有限公司 | Access method and device of file system |
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