CN104050251B - A kind of file management method and management system - Google Patents
A kind of file management method and management system Download PDFInfo
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- CN104050251B CN104050251B CN201410258463.8A CN201410258463A CN104050251B CN 104050251 B CN104050251 B CN 104050251B CN 201410258463 A CN201410258463 A CN 201410258463A CN 104050251 B CN104050251 B CN 104050251B
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/06—Digital input from, or digital output to, record carriers, e.g. RAID, emulated record carriers or networked record carriers
- G06F3/0601—Interfaces specially adapted for storage systems
- G06F3/0602—Interfaces specially adapted for storage systems specifically adapted to achieve a particular effect
- G06F3/0608—Saving storage space on storage systems
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/06—Digital input from, or digital output to, record carriers, e.g. RAID, emulated record carriers or networked record carriers
- G06F3/0601—Interfaces specially adapted for storage systems
- G06F3/0628—Interfaces specially adapted for storage systems making use of a particular technique
- G06F3/0638—Organizing or formatting or addressing of data
- G06F3/064—Management of blocks
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/06—Digital input from, or digital output to, record carriers, e.g. RAID, emulated record carriers or networked record carriers
- G06F3/0601—Interfaces specially adapted for storage systems
- G06F3/0628—Interfaces specially adapted for storage systems making use of a particular technique
- G06F3/0638—Organizing or formatting or addressing of data
- G06F3/0643—Management of files
Abstract
The present invention is applied to computer memory technical field, there is provided a kind of file management method and management system, and methods described includes：One continuous flash is divided into N number of piece of size identical, described N is the integer more than 1, described piece is identified to number；Preserve fileinfo according to preset format with file data, directory information and catalogue data in described piece N number of piece, described preset format includes the first blocks of files, the second blocks of files, the first directory block and the second directory block.The present invention, four kinds of different types of block organizations are got up, and set up a file system, and under multistage catalogue, decrease catalogue repeats storage, has saved memory space, has improve the utilization rate of memory space.
Description
Technical field
The invention belongs to computer memory technical field, more particularly, to a kind of file management method and management system.
Background technology
Jumbo flash storage is widely used in embedded development, and flash storage is due to memory capacity
Greatly, power failure data is not lost, the advantages of can be repeatedly erasable, just progressively replaced other semiconductor storage units and be widely used in moving
In the mobile electronic products such as mobile phone, PDA, digital camera.As the media of data storage and application program, flash storage
Mass data quickly and easily can be moved and exchange.Manage flash memory for convenience, file system will be set up,
File system is a kind of method of storage and organizational computing machine data, and wherein, FAT file system is that Falsh memorizer is commonly used
File system.Computer information is saved on hard disk and is referred to as in the region of " cluster ", and the cluster in general using is less, preserves letter
The efficiency of breath is higher, and in the case of FAT16, subregion is bigger, and cluster just will increase accordingly, and storage efficiency is lower, certainly will
Cause the waste of memory space.
Content of the invention
Embodiments provide a kind of file management method and management system it is intended to solve to deposit in existing file system
Storage efficiency is low, and multistage catalogue repeats, and wastes the problem of memory space.
On the one hand, provide a kind of file management method, methods described includes：
One continuous flash is divided into N number of piece of size identical, described N is the integer more than 1, described piece to compile
Number it is identified；
Preserve fileinfo and file data, directory information and catalogue data according to preset format in described piece N number of piece,
Described preset format includes the first blocks of files, the second blocks of files, the first directory block and the second directory block, wherein, one literary composition
Part information and file data can be stored in first blocks of files, or first blocks of files and multiple second blocks of files, have
During multiple described second blocks of files, described first blocks of files and first described second blocks of files bi-directional association, described second literary composition
Part block bi-directional association successively；One directory information and catalogue data can be stored in first directory block, or one first
Directory block and multiple second directory block, when having multiple described second directory block, described first directory block and first described
Two directory block bi-directional association, described second directory block bi-directional association successively, described first directory block and the second directory block association institute
There are subdirectory and the numbering of described first blocks of files, the numbering of the second blocks of files to manage to file operation.
On the other hand, provide a kind of file management system, described system includes：
Block division unit, for a continuous flash is divided into N number of piece of size identical, described N is more than 1
Integer, described piece is identified with numbering；
File management unit, for preserving fileinfo and file data, mesh according to preset format in described piece N number of piece
Record information and catalogue data, described preset format includes the first blocks of files, the second blocks of files, the first directory block and the second catalogue
Block, wherein, one fileinfo and file data can be stored in first blocks of files, or first blocks of files and
Multiple second blocks of files, when having multiple described second blocks of files, described first blocks of files second blocks of files described with first is double
To association, described second blocks of files bi-directional association successively；One directory information and catalogue data can be stored in one first
Directory block, or first directory block and multiple second directory block, when having multiple described second directory block, described first catalogue
Block and first described second directory block bi-directional association, described second directory block bi-directional association successively, described first directory block and
The numbering of the second directory block all subdirectories of association and described first blocks of files, the numbering of the second blocks of files are so as to file operation
Management.
In the embodiment of the present invention, four kinds of different types of block organizations are got up, set up a file system, in multistage catalogue
Under, decrease catalogue repeats storage, has saved memory space, has improve the utilization rate of memory space.
Brief description
Fig. 1 is the flowchart of the file management method that the embodiment of the present invention one provides；
Fig. 2 is that the block that the embodiment of the present invention one provides divides schematic diagram；
Fig. 3 is four kinds of block structure schematic diagrams that the embodiment of the present invention one provides；
Fig. 4 is the file management file storage schematic diagram that the embodiment of the present invention one provides；
Fig. 5 is the schematic diagram that the inspection file that the embodiment of the present invention one provides whether there is；
Fig. 6 is the schematic diagram opening file that the embodiment of the present invention one provides；
Fig. 7 is the schematic diagram of the positioning file that the embodiment of the present invention one provides；
Fig. 8 is the schematic diagram of the reading and writing of files that the embodiment of the present invention one provides；
Fig. 9 is the concrete structure block diagram of the file management system that the embodiment of the present invention two provides.
Specific embodiment
In order that the objects, technical solutions and advantages of the present invention become more apparent, below in conjunction with drawings and Examples, right
The present invention is further elaborated.It should be appreciated that specific embodiment described herein is only in order to explain the present invention, and
It is not used in the restriction present invention.
Below in conjunction with specific embodiment, the realization of the present invention is described in detail：
Embodiment one
Fig. 1 show the embodiment of the present invention one provide file management method realize flow process, details are as follows：
It should be noted that present invention is particularly suitable in the mobile phone using flash storage, PDA, digital camera
Deng in intelligent terminal.
In step S101, a continuous flash is divided into N number of piece of size identical, described N is whole more than 1
Number, described piece is identified with numbering.
In the present embodiment, as shown in Fig. 2 whole flash is made up of N number of piece of block, each block has a numbering,
From 0 to n, each block is fixed-size, and each catalogue or file are made up of at least one block.
In step s 102, fileinfo and file data, catalogue letter are preserved according to preset format in described piece N number of piece
Breath and catalogue data, described preset format includes the first blocks of files, the second blocks of files, the first directory block and the second directory block, its
In, one fileinfo and file data can be stored in first blocks of files, or first blocks of files and multiple
Second blocks of files, when having multiple described second blocks of files, described first blocks of files two-way pass with first described second blocks of files
Connection, described second blocks of files bi-directional association successively；One directory information and catalogue data can be stored in first catalogue
Block, or first directory block and multiple second directory block, when having multiple described second directory block, described first directory block with
First described second directory block bi-directional association, described second directory block bi-directional association successively, described first directory block and second
Directory block associates all subdirectories and the numbering of described first blocks of files, the numbering of the second blocks of files so as to file operation pipe
Reason.
In the present embodiment, block preset format is specifically as shown in figure 3, described first blocks of files FileBlockA is by filename
Name, rear-guard node next, root node parent, data length datalen, data data composition, described second blocks of files
FileBlockB is made up of predecessor node prev, rear-guard node next, data length datalen, file data data, and described
One directory block DirBlockA is made up of directory name name, rear-guard node next, root node parent, data data, and described second
Directory block DirBlockB is made up of predecessor node prev, rear-guard node next, data length datalen, catalogue data data.
This document system concrete as shown in figure 4, saving in the data of DirBlockA, all subdirectories and file under current directory
The numbering of first FileBlockA, if if file, can be plus a mark in numbering, such as 1 represents that this block is literary composition
Part block, otherwise for directory block, when under catalogue file or catalogue relatively more and when a DirBlockA does not preserve, meeting
Using second DirBlockB, the 3rd DirBlockB, until preserving subfile and subdirectory number information enough.
FileBlockA preserves the filename of certain file, and file data, when a FileBlockA not preserves this article number of packages
According to when, second FileBlockB, the 3rd FileBlockB can be used, until enough preserve file data.
What prev in FileBlockB, next preserved is the numbering of before and after FileBlockB.
As an alternative, also include mating described first directory block with file place current directory, if coupling,
One by one described second directory block is mated with the subdirectory under described current directory, until the last title mating described file, if
Coupling, then return and exist, if it is not, then return not existing.
Wherein, in multistage directory file system, such as root/subdir/file.dat checks that file f ile.dat is
No presence, as shown in figure 5, according to path, finds current directory place block, and whether coupling directory name preserves with block
Equally, identical, mate the name of its subdirectory and path subprime directory under this catalogue, to the last matching files name, find
Then return and exist, otherwise return and do not exist.
As another alternative, also include receiving OPEN, check that file whether there is, if file exists, root
According to pattern of opening, create a file handle to preserve file directory block, described file directory block is the sky of distribution from flash
Not busy block, described free block save filename and the numbering of described first blocks of files preserving fileinfo and file data,
The numbering of described second blocks of files.
Wherein, according to pattern of opening, one file handle handle of establishment, the numbering of current block, i.e. curblock, currently
Block deviation post, i.e. currentOffset, when not being to open a non-existent file in the way of read-only, need
Create a file, file creation process, as shown in fig. 6, navigating to file place catalogue first, distributes one from flash
Idle first directory block, filename preserves to idle first directory block, and the first blocks of files, the second blocks of files
Numbering is saved in clear position in catalogue.
As another alternative, also include receiving positioning instruction, inquire about corresponding first locating piece of file, and by institute
State the first locating piece and the numbering of described first locating piece is stored in described file handle.
Wherein, specifically, need to find the FirstSeekBlock that positioning starts, have following three kinds of situations：
First situation is that then FirstSeekBlock is first the first blocks of files of file to start positioning from file header；
Second situation is to obtain FirstSeekBlock from file current location positioning is from the handle opening file；
3rd situation is, from end-of-file positioning, last second blocks of files of file is FirstSeekBlock；
When position length exceedes current file block, then remaining positioning next one blocks of files, process is as shown in fig. 7, offset
To corresponding blocks of files, return file block number, and the current location of current file block is left in this document handle.
As another alternative, also include receiving reading instruction, the numbering preserving in described file handle is corresponded to
Described first blocks of files or described second blocks of files in fileinfo and file data be copied in buffer.
Wherein, obtain numbering and the current location of current block from handle, the data in block is copied to buffer
In Buffer, run through, new current block under setting handle, and position, as shown in figure 8, to read, from new position next time
Start.
As another alternative, also include receiving write instruction, by the fileinfo in described buffer and file
, to described first blocks of files or described second blocks of files, after existing described second blocks of files is write completely, setting is described for data copy
New described second blocks of files in file handle.
Wherein, obtain numbering and the current location of current block from handle, the data in block is copied to buffer
In Buffer, when file is write full, need to distribute a new block and preserve data, new block numbering is saved in upper one
In the next of block, the numbering of a upper block is saved in the prev of new block, sets up doubly linked list, then residue
Data copy is entered, and runs through, and new current block under setting handle, and position, as shown in figure 8, to write next time.
As another alternative, also include described first file BOB(beginning of block) corresponding from file, presently described second
The valid data length of all described second blocks of files before blocks of files and the bias size of presently described second blocks of files
It is added, obtain current location with respect to file first skew byte number.
Wherein, calculating whole document misregistration position, needing from first the first file BOB(beginning of block) of file, before current block
Each block valid data length adds up, and along with the bias size of current block, as whole file current location is with respect to literary composition
Part first skew byte number.
As another alternative, also include according to described first blocks of files all in described file handle, described
The valid data length of two blocks of files, obtains file size.
Wherein, each block saves the length of valid data, and FileBlockA, FileBlockB in such as Fig. 3, from file
First the first blocks of files of this document is obtained, the next preserving from first the first blocks of files finds first in handle handle
Individual second blocks of files, the next of first the second blocks of files finds second first the second blocks of files, finds last always
Individual first the second blocks of files.Datalen in each block is added up, as all data lengths of current file.
The present embodiment, four kinds of different types of block organizations are got up, and set up a file system, under multistage catalogue, subtract
That has lacked catalogue repeats storage, has saved memory space, has improve the utilization rate of memory space.
Embodiment two
Fig. 9 shows the concrete structure block diagram of the file management system that the embodiment of the present invention two provides, for convenience of description,
Illustrate only the part related to the embodiment of the present invention.In the present embodiment, this document management system includes：Block division unit 91
With file management unit 92.
Wherein, block division unit 91, for a continuous flash is divided into N number of piece of size identical, described N is
Integer more than 1, described piece is identified with numbering；
File management unit 92, in described piece N number of piece according to preset format preserve fileinfo and file data,
Directory information and catalogue data, described preset format includes the first blocks of files, the second blocks of files, the first directory block and the second catalogue
Block, wherein, one fileinfo and file data can be stored in first blocks of files, or first blocks of files and
Multiple second blocks of files, when having multiple described second blocks of files, described first blocks of files second blocks of files described with first is double
To association, described second blocks of files bi-directional association successively；One directory information and catalogue data can be stored in one first
Directory block, or first directory block and multiple second directory block, when having multiple described second directory block, described first catalogue
Block and first described second directory block bi-directional association, described second directory block bi-directional association successively, described first directory block and
The numbering of the second directory block all subdirectories of association and described first blocks of files, the numbering of the second blocks of files are so as to file operation
Management.
Further, described file management unit 92 also includes：
File checking module 921, for described first directory block is mated with current directory described in file, if coupling, by
One mates described second directory block with the subdirectory under described current directory, until the last title mating described file, if
Join, then return and exist, if it is not, then return not existing.
File Open module 922, for receiving OPEN, checks that file whether there is, if file exists, according to opening
Pattern, creates a file handle to preserve file directory block, and described file directory block is the free block of distribution from flash,
Described free block saves filename and the numbering preserving fileinfo and described first blocks of files of file data, described
The numbering of the second blocks of files.
Document alignment module 923, for receiving positioning instruction, inquires about corresponding first locating piece of file, and by described the
The numbering of a positioning block and described first locating piece is stored in described file handle.
File read module 924, reads instruction for receiving, will be corresponding described for the numbering preserving in described file handle
In first blocks of files or described second blocks of files, fileinfo and file data are copied in buffer.
File writing module 925, for receiving write instruction, the fileinfo in described buffer and file data is copied
Shellfish, to described first blocks of files or described second blocks of files, after existing described second blocks of files is write completely, arranges described file sentence
New described second blocks of files in handle.
Calculations of offset module 926, for from the corresponding described first file BOB(beginning of block) of file, presently described second blocks of files
The valid data length of all described second blocks of files before and the bias size of presently described second blocks of files are added, and obtain
Take current location with respect to file first skew byte number.
Length computation module 927, for according to described first blocks of files all in described file handle, described second file
The valid data length of block, obtains file size.
The present embodiment, four kinds of different types of block organizations are got up, and set up a file system, under multistage catalogue, subtract
That has lacked catalogue repeats storage, has saved memory space, has improve the utilization rate of memory space.
File management system provided in an embodiment of the present invention can be applied in aforementioned corresponding embodiment of the method one, details
Referring to the description of above-described embodiment one, will not be described here.
It should be noted that in said system embodiment, included unit simply carries out drawing according to function logic
Point, but it is not limited to above-mentioned division, as long as being capable of corresponding function；In addition, each functional unit is concrete
Title also only to facilitate mutual distinguish, is not limited to protection scope of the present invention.
In addition, one of ordinary skill in the art will appreciate that realizing all or part of step in the various embodiments described above method
The program that can be by complete come the hardware to instruct correlation, and corresponding program can be stored in an embodied on computer readable storage and be situated between
In matter, described storage medium, such as ROM/RAM, disk or CD etc..The foregoing is only presently preferred embodiments of the present invention and
, not in order to limit the present invention, all any modification, equivalent and improvement made within the spirit and principles in the present invention
Deng should be included within the scope of the present invention.
Claims (7)
1. a kind of file management method is it is characterised in that methods described includes：
One continuous flash is divided into N number of piece of size identical, described N is the integer more than 1, described piece with number into
Line identifier；
Preserve fileinfo and file data, directory information and catalogue data according to preset format in described piece N number of piece, described
Preset format includes the first blocks of files, the second blocks of files, the first directory block and the second directory block, wherein, one file letter
Breath and file data can be stored in first blocks of files, or first blocks of files and multiple second blocks of files, have multiple
During described second blocks of files, described first blocks of files and first described second blocks of files bi-directional association, described second blocks of files
Bi-directional association successively；One directory information and catalogue data can be stored in first directory block, or first catalogue
Block and multiple second directory block, when having multiple described second directory block, described first directory block and first described second mesh
Record block bi-directional association, described second directory block bi-directional association successively, described first directory block and the second directory block associate all sons
The numbering of catalogue and described first blocks of files, the numbering of the second blocks of files are to manage to file operation；
Methods described also includes：
Described first directory block is mated with file place current directory, if coupling, one by one with the specific item under the current directory of place
Described second directory block is mated in record, until the last title mating described file, if coupling, returns and exists, if it is not, then returning
Do not exist；
Methods described also includes：
Receive OPEN, check that file whether there is, if file exists, according to pattern of opening, create a file handle with
Preserve file directory block, described file directory block be from flash distribution free block, described free block save filename,
And preserve the numbering of described first blocks of files of fileinfo and file data, the numbering of described second blocks of files.
2. the method for claim 1 is it is characterised in that methods described also includes：
Receive positioning instruction, inquire about corresponding first locating piece of file, and by described first locating piece and described first locating piece
Numbering be stored in described file handle.
3. the method for claim 1 is it is characterised in that methods described also includes：
Receive and read instruction, by corresponding described first blocks of files of numbering preserving in described file handle or described second file
In block, fileinfo and file data are copied in buffer.
4. method as claimed in claim 3 is it is characterised in that methods described also includes：
Receive write instruction, the fileinfo in described buffer and file data are copied to described first blocks of files or described
In second blocks of files, after existing described second blocks of files is write completely, new described second blocks of files in described file handle is set.
5. the method as described in claim 1,3 or 4 is it is characterised in that methods described also includes：
From the corresponding described first file BOB(beginning of block) of file, all described second blocks of files before presently described second blocks of files
Valid data length and the bias size of presently described second blocks of files be added, obtain current location first with respect to file partially
Move byte number.
6. the method as described in claim 1,3 or 4 is it is characterised in that methods described also includes：
According to the valid data length of described first blocks of files all in described file handle, described second blocks of files, obtain literary composition
Part length.
7. a kind of file management system is it is characterised in that include：
Block division unit, for a continuous flash is divided into N number of piece of size identical, described N is the integer more than 1,
Described piece is identified with numbering；
File management unit, for preserving fileinfo and file data, catalogue letter according to preset format in described piece N number of piece
Breath and catalogue data, described preset format includes the first blocks of files, the second blocks of files, the first directory block and the second directory block, its
In, one fileinfo and file data can be stored in first blocks of files, or first blocks of files and multiple
Second blocks of files, when having multiple described second blocks of files, described first blocks of files two-way pass with first described second blocks of files
Connection, described second blocks of files bi-directional association successively；One directory information and catalogue data can be stored in first catalogue
Block, or first directory block and multiple second directory block, when having multiple described second directory block, described first directory block with
First described second directory block bi-directional association, described second directory block bi-directional association successively, described first directory block and second
Directory block associates all subdirectories and the numbering of described first blocks of files, the numbering of the second blocks of files so as to file operation pipe
Reason；
Described file management unit also includes：
File checking module, for mating described first directory block with file place current directory, if coupling, one by one to be located
Subdirectory under current directory mates described second directory block, until the last title mating described file, if coupling, returns
Exist, if it is not, then return not existing；
File Open module, for receiving OPEN, checks that file whether there is, if file exists, according to opening pattern, creates
Build a file handle to preserve file directory block, described file directory block is the free block of distribution from flash, the described free time
Block saves filename and preserves the numbering of described first blocks of files of fileinfo and file data, described second file
The numbering of block；
Document alignment module, for receiving positioning instruction, inquires about corresponding first locating piece of file, and by described first locating piece
It is stored in described file handle with the numbering of described first locating piece；
File read module, reads instruction for receiving, by corresponding for the numbering preserving in described file handle described first literary composition
In part block or described second blocks of files, fileinfo and file data are copied in buffer；
File writing module, for receiving write instruction, the fileinfo in described buffer and file data is copied to institute
State in the first blocks of files or described second blocks of files, after existing described second blocks of files is write completely, arrange new in described file handle
Described second blocks of files；
Calculations of offset module, for from the corresponding described first file BOB(beginning of block) of file, before presently described second blocks of files
The bias size of the valid data length of all described second blocks of files and presently described second blocks of files is added, and obtains current
The position skew byte number first with respect to file；
Length computation module, for according to described first blocks of files all in described file handle, the having of described second blocks of files
Effect data length, obtains file size.
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| CN105138655A (en) * | 2015-08-31 | 2015-12-09 | 深圳市茁壮网络股份有限公司 | Data storage and reading method and device |
| CN107357869A (en) * | 2017-07-03 | 2017-11-17 | 张宇 | A kind of file operation method suitable for cloud storage |
| CN110709824B (en) * | 2018-02-05 | 2022-01-14 | 华为技术有限公司 | Data query method and device |
| CN110569201B (en) * | 2019-08-23 | 2021-09-10 | 苏州浪潮智能科技有限公司 | Method and device for reducing write latency under solid state disk GC |
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| Flash存储卡文件系统的研究;阎航;《中国优秀博硕士学位论文全文数据库 (硕士) 信息科技辑》;20070515;第3.1节第1段，第4.1节第1段，第4.2节，图4-2，图4-4 * |
| 一种支持FAT文件系统的Flash转换层设计;匡伟 等;《重庆邮电大学学报（自然科学版）》;20120831;第24卷(第2期);第259-263页 * |
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