CN103593219B - A kind of quick start method of the highly reliable file system for NAND FLASH device - Google Patents
A kind of quick start method of the highly reliable file system for NAND FLASH device Download PDFInfo
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- CN103593219B CN103593219B CN201310625980.XA CN201310625980A CN103593219B CN 103593219 B CN103593219 B CN 103593219B CN 201310625980 A CN201310625980 A CN 201310625980A CN 103593219 B CN103593219 B CN 103593219B
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Abstract
The present invention relates to the quick start method of a kind of highly reliable file system for NAND FLASH device, comprise the following steps: 1] realize file system consistency: 1.1] application memory space, dynamically distribution and file system configuration according to file system create an initial transaction point, and submit initial transaction point to；The current state information of the file system 1.2] recorded, creates a new affairs point according to the current state information of file system；1.3] buffer stopper is utilized to reclaim the initial memory of initial transaction point, standby；1.4] step 1.1 is performed], until initial operation content completes；2] startup file system.The present invention solves the problem that the file system toggle speed of existing NAND FLASH device is the slowest, the present invention to reduce the integrity checking of file system by a kind of rational file system consistency scheme, is only scanned disk suitable time and effectively shortens the file system startup time.
Description
Technical field
The invention belongs to computer software fields, being specifically related to a kind of height for NAND FLASH device can
Quick start method by file system.
Background technology
Towards the file system of the Mass Data Storage Facilities such as NAND FLASH on startup owing to enter
Row following steps:
1, device power need to run the integrity of the Application inspection file system such as similar chkdsk when starting.
2, when towards big array flash memory device, owing to needs scan whole big array flash memory to set up its disk
Status information, the most jumbo storage device, scans whole disk and can take the substantial amounts of time.
Comprehensive factors above, causes file system toggle speed the slowest.It is thus desirable to design a kind of new setting
Meter method, reduces above step, improves file system toggle speed.
Summary of the invention
Technology in order to solve the file system toggle speed of existing NAND FLASH device the slowest is asked
Topic, the present invention provides the quickly side of startup of a kind of highly reliable file system for NAND FLASH device
Method, the present invention is by designing a kind of rational file system consistency scheme to reduce the integrity of file system
Check, and only scanning disk effectively shortens file system startup to reduce disk scanning expense suitable time
Time.
The technical solution of the present invention:
The quick start method of a kind of highly reliable file system for NAND FLASH device, including following
Step:
1] file system consistency is realized:
1.1] application memory space, dynamically distribution and file system according to file system configure at the beginning of creating one
Beginning affairs point, and submit initial transaction point to；
Described initial transaction point includes initial memory and initial operation content, and described initial memory is
File system is dynamically distributed, and described initial operation content is file system configuration；
1.2] current state information of log file system, creates one according to the current state information of file system
Individual new affairs point；New affairs point includes new memory space and new operation content, described new operation
Content is consistent with initial operation content；
New affairs point, new operation content is submitted to cover the initial operation content of initial transaction point；
1.3] buffer stopper is utilized to reclaim the initial memory of initial transaction point, standby；
1.4] step 1.1 is repeated]-1.3], until initial operation content completes；
2] startup file system.
Also include whether before being additionally included in startup file system to scan sentencing of NAND FLASH storage device
Disconnected step:
A] NAND FLASH storage device carry first, each memory block application in storage device is deposited
Storage space, by the memory block residing for the VBF information of memory space record storage device of application and memory space
VBF information；
B] NAND FLASH storage device reloads, and obtains the current state information of storage device, with
Time the VBF information of the storage device of storage and the VBF information of each memory block when searching carry first；
C] entering the VBF information of the VBF information of current state information and storage device and each memory block
Row compares, if unanimously, then NAND FLASH storage device directly uses above-mentioned VBF information, need not
Rescan NAND FLASH storage device；If it is inconsistent, to NAND FLASH storage device
Perform scanning.
Advantage for present invention:
1, the present invention is by affairs point mechanism, it is ensured that the concordance of file system, decreases by similar chkdsk
Etc. the integrity that should spend extra inspection file system.
2, the present invention file system start needed for equipment carry time, the scan full hard disk becoming each is swept into on-demand
Retouch, by preserving storing device information, it is judged that information state is the most correct, decides whether again to store
Device scan.It is greatly improved the toggle speed of file system, when meeting airborne field to the startup of file system
Between requirement.
Accompanying drawing explanation
Fig. 1 is affairs point mechanism functions；
Fig. 2 is file system Booting sequence comparison diagram.
Detailed description of the invention
A kind of reasonably file system consistency scheme of design, reduces the file system integrity after device power
Check.
The present invention uses affairs point mechanism to ensure when file system at any time breaks down and can return to
A certain correct status.Realize especially by following steps:
1] file system consistency is realized:
1.1] application memory space, dynamically distribution and file system according to file system configure at the beginning of creating one
Beginning affairs point, and submit initial transaction point to；(data in internal memory will update storage and set on initial transaction point
Standby upper)
Initial transaction point includes initial memory and initial operation content, and initial memory is file system
Dynamically distribution, initial operation content is file system configuration；
1.2] current state information of log file system, creates one according to the current state information of file system
Individual new affairs point；New affairs point includes new memory space and new operation content, new operation content
Consistent with initial operation content；
New affairs point, new operation content is submitted to cover the initial operation content of initial transaction point；(work as file
When system occurs power-off between two affairs points, file data is reverted to the stable shape that file system is last
State.It is supplied to user one with this and is always maintained at conforming file system)
1.3] buffer stopper is utilized to reclaim the initial memory of initial transaction point, standby；
1.4] step 1.1 is repeated]-1.2], until initial operation content completes；
2] startup file system.When device power starts, it is not necessary to rerun the application programs such as similar chkdsk
Carry out the integrity checking of file system.
Affairs point mechanism is as it is shown in figure 1, T1 moment user configured affairs point task occurs, at the beginning of preserving one
Beginning affairs point, then, user configured initial transaction point task (such as written document) is successfully completed backward system
Submitting to, system triggers affairs point after receiving submission request and creates, new affairs point record file system at that time
System status information, and covers an initial transaction point, and system is knowing execution after affairs point creates successfully
External memory reclaims.During file operation, such as TI-T2 moment, system crash or power down, file system rolls back to
A upper affairs dotted state.
Further determined whether to scan NAND FLASH storage device before startup file system: setting up disk
During status information, suitable time, only scan disk to reduce disk scanning expense.
When storage device carry first, each memory block is distributed a little block space and is stored this storage device
VBF information and the VBF information of corresponding memory block；
After storage device is reloaded, the VBF information of preservation can be found, if it find that and determine this VBF
Information is that effectively it can use this status information, and need not rescan storage device.
Once being used, for preventing the outmoded of status information, on disk, there is any other activity in this state
Before, this status information will lose efficacy.If after disk establishment, effective status information is not found, will be by biography
System method performs disk scanning.Especially for large capacity disc, the scanning of whole disk can be wasted substantial amounts of
Time organizes Disk State information, by reducing disk scanning number of times, only carries out disk needs when
Scanning, can greatly reduce time overhead, improves toggle speed.
As in figure 2 it is shown, the file system that the present invention saves similar chkdsk by affairs point Mechanism Design is complete
Whole property checks step, and during equipment carry needed for file system starts, becomes each scan full hard disk into pressing
Need scanning, by preserving disc information, it is judged that information state is the most correct, decides whether disk again
Scanning.
By said method, the toggle speed of file system can be greatly improved, meet airborne field to file
The startup time requirement of system.Do not using the whole logic magnetic disc of on-demand scanning (testing the electric board for 8G)
Time, the toggle speed of file system is 58 seconds, by preserving Disk State information during first time carry, logical
When crossing lookup status information on-demand scanning logic disk, the toggle speed of file system is less than 10 seconds.
Use the specific works step of file system quick start method of the present invention:
(1) ensure that the concordance of file system (i.e. reduces the file system of similar chkdsk by affairs point mechanism
System integrity checking step)；
(2) file system device carry obtains disc information time-varying scan full hard disk is on-demand scanning；
(3) startup file system: if equipment carry for the first time, need to scan whole disk, and store phase
The Disk State information answered, then, when being again started up after step 3 successfully starts up, can realize the present invention and be reached
The effect arrived.
Claims (1)
1., for the quick start method of highly reliable file system for NAND FLASH device, it is special
Levy and be, comprise the following steps:
1] file system consistency is realized:
1.1] application memory space, dynamically distribution and file system according to file system configure at the beginning of creating one
Beginning affairs point, and submit initial transaction point to；
Described initial transaction point includes initial memory and initial operation content, and described initial memory is
File system is dynamically distributed, and described initial operation content is file system configuration；
1.2] current state information of log file system, creates one according to the current state information of file system
Individual new affairs point；New affairs point includes new memory space and new operation content, described new operation
Content is consistent with initial operation content；
New affairs point, new operation content is submitted to cover the initial operation content of initial transaction point；
1.3] buffer stopper is utilized to reclaim the initial memory of initial transaction point, standby；
1.4] step 1.1 is repeated]-1.3], until initial operation content completes；
2] the judgement step of NAND FLASH storage device whether is scanned:
A] NAND FLASH storage device carry first, each memory block application in storage device is deposited
Storage space, by the memory block residing for the VBF information of memory space record storage device of application and memory space
VBF information；
B] NAND FLASH storage device reloads, and obtains the current state information of storage device, with
Time the VBF information of the storage device of storage and the VBF information of each memory block when searching carry first；
C] entering the VBF information of the VBF information of current state information and storage device and each memory block
Row compares, if unanimously, then NAND FLASH storage device directly uses above-mentioned VBF information, need not
Rescan NAND FLASH storage device；If it is inconsistent, to NAND FLASH storage device
Perform scanning；
3] startup file system.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310625980.XA CN103593219B (en) | 2013-11-27 | 2013-11-27 | A kind of quick start method of the highly reliable file system for NAND FLASH device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310625980.XA CN103593219B (en) | 2013-11-27 | 2013-11-27 | A kind of quick start method of the highly reliable file system for NAND FLASH device |
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| CN103593219A CN103593219A (en) | 2014-02-19 |
| CN103593219B true CN103593219B (en) | 2016-08-17 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104794180B (en) * | 2015-04-09 | 2018-06-15 | 广东小天才科技有限公司 | A kind of point reader scanning obtains the method and device of learning materials |
| CN110019046B (en) * | 2017-12-29 | 2024-05-14 | 北京奇虎科技有限公司 | Log landing method and device |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1822230A (en) * | 2006-03-02 | 2006-08-23 | 浙江大学 | Method for realizing memory file system based on NAND Flash |
| EP2071463A2 (en) * | 2007-11-14 | 2009-06-17 | Infineon Technologies AG | Method for processing a file, storage medium and processing arrangement |
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2013
- 2013-11-27 CN CN201310625980.XA patent/CN103593219B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1822230A (en) * | 2006-03-02 | 2006-08-23 | 浙江大学 | Method for realizing memory file system based on NAND Flash |
| EP2071463A2 (en) * | 2007-11-14 | 2009-06-17 | Infineon Technologies AG | Method for processing a file, storage medium and processing arrangement |
Non-Patent Citations (1)
| Title |
|---|
| 事务型文件***存储管理机制的研究与实现;杨琼 等;《航空计算技术》;20110930;第41卷(第5期);第82页 * |
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