CN108255644A - File system recovery method and device - Google Patents
File system recovery method and device Download PDFInfo
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- CN108255644A CN108255644A CN201711472107.6A CN201711472107A CN108255644A CN 108255644 A CN108255644 A CN 108255644A CN 201711472107 A CN201711472107 A CN 201711472107A CN 108255644 A CN108255644 A CN 108255644A
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- cryptographic hash
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F11/00—Error detection; Error correction; Monitoring
- G06F11/07—Responding to the occurrence of a fault, e.g. fault tolerance
- G06F11/14—Error detection or correction of the data by redundancy in operation
- G06F11/1402—Saving, restoring, recovering or retrying
- G06F11/1415—Saving, restoring, recovering or retrying at system level
- G06F11/1438—Restarting or rejuvenating
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Abstract
This application discloses file system recovery method and device, wherein the method includes：In response to file system corruption, the block number of broken parts is determined；Whether safe detect current environment；In response to current environment safety, the reparation for the file system directly damaged；And it is dangerous in response to current environment, system reboot enters BootLoader patterns, the reparation for the file system then damaged.The present invention is enabled in file system corruption, different correcting strategies is taken to repair automatically according to Environmental security situation, is greatly strengthened the safety of smart mobile phone and embedded device, is improved the maintainability of equipment and is improved user experience.
Description
Technical field
This application involves electric digital data processing field more particularly to file system recovery methods and device.
Background technology
Android proposes the method for dm-verity to protect file system since 4.4 versions.Dm-verity is based on
The Device mapper frames of kernel (kernel).Device mapper are the one kind provided in kernel from logical device to object
The mapping framework mechanism of equipment is managed, under the mechanism, user can easily formulate according to the demand of oneself and realize storage money
The management strategy in source.Dm-verity describes entire system (system) mirror image with hash (Hash) tree.This mechanism permits
Perhaps system subregions are verified when read-write rather than are disposably verified entire system mirror images.Work as verification
When hash values are inconsistent, that is, show that certain block (block) of file system are destroyed, return to an I O error.It is at this point, literary
Certain functions of part system will be unable to use.
Invention content
In order to overcome the deficiencies in the prior art, the technical problem to be solved in the present invention is to provide a kind of file system
Restoration methods and device can be reduced the influence used user, promote user in time by the file system area reparation of destruction
Experience.
In order to solve the above technical problems, the file system recovery method of the present invention, including：
In response to file system corruption, the block number of broken parts is determined；
Whether safe detect current environment；
In response to current environment safety, the reparation for the file system directly damaged；And
Dangerous in response to current environment, system reboot enters BootLoader patterns, the file system then damaged
The reparation of system.
It is described in response to current environment safety as the improvement of the method for the invention, the file system directly damaged
The reparation of system includes：Binary file for reparation is obtained according to the block number；Calculate acquired binary file
Cryptographic Hash；The cryptographic Hash of calculating cryptographic Hash corresponding to factory state is compared；It is correct in response to the cryptographic Hash of calculating, meter
Calculate the corresponding sector of the block number；Acquired binary file is write to calculated sector.
Another kind as the method for the invention improves, described dangerous in response to current environment, and system reboot enters
BootLoader patterns, the reparation for the file system then damaged include：System reboot is made to enter BootLoader patterns；
Binary file for reparation is obtained according to the block number；Calculate the cryptographic Hash of acquired binary file；It will calculate
Cryptographic Hash cryptographic Hash corresponding to factory state be compared；It is correct in response to the cryptographic Hash of calculating, calculate the block number
Corresponding sector；Acquired binary file is write to calculated sector；Each piece of cryptographic Hash of calculation document system；
Whether corresponding cryptographic Hash is consistent to factory state for each piece of cryptographic Hash of inspection file system；In response to any one piece of Kazakhstan
Corresponding cryptographic Hash is inconsistent to factory state for uncommon value, and the same repair process of block with damaging is carried out to the block.
As being further improved for the method for the invention, it is described for reparation binary file from network server,
Locally the read-only zones of hiding backup region or local obtain.
Another as the method for the invention is further improved, and locally hiding backup region passes through not depositing equipment
The initial sector in the region of deposit part file system is mapped with 0 sector of file system to be hidden.
In order to solve the above technical problems, the file system recovery device of the present invention, including：
Block number determining module, in response to file system corruption, determining the block number of broken parts；
Environmental security detection module, it is whether safe for detecting current environment；
First repair module, in response to current environment safety, the reparation for the file system directly damaged；And
Second repair module, for dangerous in response to current environment, system reboot enters BootLoader patterns, then
The reparation for the file system damaged.
As the improvement of device of the present invention, first repair module includes：File acquisition submodule, for basis
The block number obtains the binary file for reparation；First cryptographic Hash computational submodule, for calculate acquired two into
The cryptographic Hash of file processed；First comparison sub-module, for the cryptographic Hash of calculating cryptographic Hash corresponding to factory state to be compared
Compared with；Sector computational submodule, it is correct for the cryptographic Hash in response to calculating, calculate the corresponding sector of the block number；Written document
Submodule, for acquired binary file to be write to calculated sector.
Another kind as device of the present invention improves, and second repair module includes：Submodule is restarted, for making
System reboot enters BootLoader patterns；File acquisition submodule, for obtaining two for reparation according to the block number
Binary file；First cryptographic Hash computational submodule, for calculating the cryptographic Hash of acquired binary file；First compares submodule
Block, for the cryptographic Hash of calculating cryptographic Hash corresponding to factory state to be compared；Sector computational submodule, in response to
The cryptographic Hash of calculating is correct, calculates the corresponding sector of the block number；Written document submodule, for acquired binary system is literary
Part writes calculated sector；Second cryptographic Hash computational submodule, for each piece of cryptographic Hash of calculation document system；Second
Comparison sub-module, for checking each piece of file system of cryptographic Hash, whether corresponding cryptographic Hash is consistent to factory state；It follows
Ring repair submodule, for the cryptographic Hash in response to any one piece, corresponding cryptographic Hash is inconsistent to factory state, to the block into
Row and the same repair process of block of damage.
In order to solve the above technical problems, the visible computer readable medium of the present invention, the text including being used to perform the present invention
The computer program code of part system recovery method.
In order to solve the above technical problems, the present invention provides a kind of device, including at least one processor；And it at least one deposits
Reservoir, containing computer program code, at least one processor and the computer program code are configured as utilizing institute
Stating at least one processor causes described device to perform at least part step of the file system recovery method of the present invention.
According to the present invention, by the way that when dm-verity has found file system corruption, difference is taken according to Environmental security situation
Correcting strategy repaired in time, it is ensured that when root file system is damaged, can repair automatically, greatly strengthen smart mobile phone
With the safety of embedded device, improve the maintainability of equipment and improve user experience.
After the detailed description of embodiment of the present invention is read in conjunction with the figure, other features and advantages of the invention will become more
Add clear.
Description of the drawings
Fig. 1 is the flow chart according to an embodiment of the method for the present invention.
Fig. 2 is the structure diagram according to an embodiment of apparatus of the present invention.
For clarity, these attached drawings are figure that is schematic and simplifying, they are only gived for understanding institute of the present invention
Necessary details, and omit other details.
Specific embodiment
Embodiments of the present invention and embodiment are described in detail with reference to the accompanying drawings.
By detailed description given below, the scope of application of the invention will be evident.It will be appreciated, however, that detailed
While thin description and specific example show the preferred embodiment of the present invention, they are provided only for illustration purpose.
Fig. 1 shows the flow chart of an embodiment of file system recovery method according to the present invention.
In step S102, file system corruption is found in response to dm-verity, dm-verity can provide the block of damage
Id (block number).
It is whether safe by security module detecting system current environment in step S104.If security module determines system
Environmental security, then processing proceed to step S110.Otherwise, if security module determines that system environments is dangerous, progress is handled
To step S150.The detection of security module can determine as needed.In general, security module can detect the true and false of base station, wifi
Safety etc., for example whether there are arp attacks, DNS distort, unencryption etc..
In step S110, the block id of damage are sent to network server, network server is according to the block id
The content to be downloaded of client is returned to, form is binary file.
In step S112, client calculates the hash values for the binary file downloaded.
In step S114, the hash values of calculating hash values corresponding to factory state are compared.If it calculates
Hash values are correct, then processing proceeds to step S116.Otherwise, if the hash values calculated are incorrect, illustrate the process downloaded
In there is mistake, need to re-download, processing is back to step S110.
In step S116, which is calculated by the file system of kernel.It is corresponding when reading
Sector is exactly the sector to be write when writing.
In step S118, using write functions by the respective sectors of the binary file write device of download.So far, it breaks
Bad root file system is repaired in time, does not influence user's use.
It is dangerous in response to system current environment in step S150, system reboot is made to enter BootLoader patterns.
In step S152, the block id of damage are sent to network server, network server is according to the block id
The content to be downloaded of client is returned to, form is binary file.
In step S154, client calculates the hash values for the binary file downloaded.
In step S156, the hash values of calculating hash values corresponding to factory state are compared.If it calculates
Hash values are correct, then processing proceeds to step S158.Otherwise, if the hash values calculated are incorrect, illustrate the process downloaded
In there is mistake, need to re-download, processing is back to step S152.
In step S158, the corresponding sectors of block id are calculated.
In step S160, that calls bootloader writes function by the corresponding fan of the binary file write device of download
Area.
In step S162, the hash values of each block are recalculated under bootloader.
In step S164, the hash values hash values whether corresponding to factory state of each block of file system are checked
Unanimously.If any one piece of cryptographic Hash is to factory state, corresponding cryptographic Hash is inconsistent, and processing is right back to step S152
Inconsistent block is repaired, until all block are completely correct.If the hash values of each block are with going out
The corresponding hash values of factory's state are consistent, then processing terminates.
In the above embodiments, using network server come to repair the benefit of root file system be to save a large amount of storages
Space, the space in such equipment can preferably use it is used by a user spatially.
However, in other embodiments, the file system that client local backup can also be used carries out repairing for damage block
It is multiple.In this case, ensure that the safety of the file system of backup is particularly significant.It in embodiment, can be standby by file system
Part region stashes.There is a interface between file system and driving layer, 0 sector of equipment and file system are thought
The docking of 0 sector is got up, if x-th of sector of equipment and 0 sector of file system are mapped, then file system will
Think x-th of sector of equipment it is corresponding be exactly 0 sector, thus achieved the purpose that hide certain sectors.Conceal file
Behind system backup region, then application program can not just see the content of the subregion.That is no matter application program possesses
Which kind of permission can not all see the content of the subregion, so as to ensure the safety in file system backup region.But it is visited during in order to repair
It asks the file system of backup, oneself back door can be left for.Environmental security and need repair when open this back door, use
Proc or sys file system goes to copy corresponding data to kernel Transfer Parameters, so as to be available for the binary system repaired text
Part.Such benefit is can to sense to complete to repair less than in the case of in user, improves user experience.If system environments is not
Safety, system reboot enter bootloader patterns, the work of hidden partition are not done using another kernel, this kernel
Make, system can see backup subregion and copy and directly repaired for the binary file of reparation after getting up.
In other embodiments, local backup region can not also hide, and be set as read-only in user's space, with selinux,
Root fractions related mechanisms is protected.With read-only mode carry when needing, the block changed or file or entire subregion are override
It is repaired.
Fig. 2 shows the structure diagrams of an embodiment of file system recovery device according to the present invention.The embodiment
Device include：Block number determining module 202, in response to file system corruption, determining the block number of broken parts；Environment
Safety detection module 204, it is whether safe for detecting current environment；First repair module 206, for pacifying in response to current environment
Entirely, the reparation for the file system directly damaged；And second repair module 208, for dangerous in response to current environment, it is
System reboots into BootLoader patterns, the reparation for the file system then damaged.
According to a kind of embodiment of apparatus of the present invention, the first repair module includes：File acquisition submodule, for basis
The block number obtains the binary file for reparation；First cryptographic Hash computational submodule, for calculate acquired two into
The cryptographic Hash of file processed；First comparison sub-module, for the cryptographic Hash of calculating cryptographic Hash corresponding to factory state to be compared
Compared with；Sector computational submodule, it is correct for the cryptographic Hash in response to calculating, calculate the corresponding sector of the block number；Written document
Submodule, for acquired binary file to be write to calculated sector.
According to another embodiment of apparatus of the present invention, the second repair module includes：Submodule is restarted, for making system
Reboot into BootLoader patterns；File acquisition submodule, for obtaining the binary system for reparation according to the block number
File；First cryptographic Hash computational submodule, for calculating the cryptographic Hash of acquired binary file；First comparison sub-module,
For the cryptographic Hash of calculating cryptographic Hash corresponding to factory state to be compared；Sector computational submodule, by response to based on
The cryptographic Hash of calculation is correct, calculates the corresponding sector of the block number；Written document submodule, for by acquired binary file
Write calculated sector；Second cryptographic Hash computational submodule, for each piece of cryptographic Hash of calculation document system；Second ratio
Compared with submodule, for checking each piece of file system of cryptographic Hash, whether corresponding cryptographic Hash is consistent to factory state；Cycle
Submodule is repaired, corresponding cryptographic Hash is inconsistent to factory state for the cryptographic Hash in response to any one piece, which is carried out
With the same repair process of block of damage.
Multiple and different embodiments or its a particular feature, structure, or characteristic described herein can be at one or more of the present invention
It is appropriately combined in a embodiment.In addition, in some cases, as long as suitably, in flow chart and/or the step of stream treatment description
Rapid sequence can be changed, and not necessarily must accurately perform in the described sequence.In addition, multiple and different aspects of the present invention can be used
Software, hardware, firmware or a combination thereof and/or perform other computer-implemented modules of the function or device carry out it is real
It applies.The software implementation of the present invention may include preserving in computer-readable medium and be held by what one or more processors performed
Line code.Computer-readable medium may include computer hard disc driver, ROM, RAM, flash memory, pocket computer storage medium such as
CD-ROM, DVD-ROM, flash disc drives and/or other devices for example with universal serial bus (USB) interface and/or appoint
What its appropriate tangible or non-of short duration computer-readable medium or executable code can be preserved thereon and be performed by processor
Computer storage.The present invention can combine any appropriate operating system and use.
Unless explicitly stated otherwise, singulative as used herein " one ", "the", which include plural reference, (has " at least one "
The meaning).It will be further understood that terminology used herein " having ", " comprising " and/or "comprising" show in the presence of described
Feature, step, operation, element and/or component, but do not preclude the presence or addition of other one or more features, step, behaviour
Work, element, component and/or a combination thereof.Term "and/or" as used in this includes one or more relevant items enumerated
Any and all combination.
Some currently preferred embodiments of the present invention is foregoing described, it should be emphasized, however, that the present invention is not limited to these
Embodiment, but can be realized with the other manner in the range of present subject matter.Those skilled in the art can be in the technology of the present invention
It the inspiration of design and does not depart from various variants and modifications is made to the present invention on the basis of the content of present invention, these deformations or modification
It still falls within protection scope of the present invention.
Claims (10)
1. a kind of file system recovery method, which is characterized in that the method includes：
In response to file system corruption, the block number of broken parts is determined；
Whether safe detect current environment；
In response to current environment safety, the reparation for the file system directly damaged；And
Dangerous in response to current environment, system reboot enters BootLoader patterns, the file system then damaged
It repairs.
2. according to the method described in claim 1, it is characterized in that, it is described in response to current environment safety, directly damaged
The reparation of file system include：
Binary file for reparation is obtained according to the block number；
Calculate the cryptographic Hash of acquired binary file；
The cryptographic Hash of calculating cryptographic Hash corresponding to factory state is compared；
It is correct in response to the cryptographic Hash of calculating, calculate the corresponding sector of the block number；
Acquired binary file is write to calculated sector.
3. according to the method described in claim 1, it is characterized in that, described dangerous in response to current environment, system reboot into
Enter BootLoader patterns, the reparation for the file system then damaged includes：
System reboot is made to enter BootLoader patterns；
Binary file for reparation is obtained according to the block number；
Calculate the cryptographic Hash of acquired binary file；
The cryptographic Hash of calculating cryptographic Hash corresponding to factory state is compared；
It is correct in response to the cryptographic Hash of calculating, calculate the corresponding sector of the block number；
Acquired binary file is write to calculated sector；
Each piece of cryptographic Hash of calculation document system；
Whether corresponding cryptographic Hash is consistent to factory state for each piece of cryptographic Hash of inspection file system；
In response to any one piece of cryptographic Hash, corresponding cryptographic Hash is inconsistent to factory state, which is carried out same with the block of damage
The repair process of sample.
4. according to the method in claim 2 or 3, which is characterized in that the binary file for reparation takes from network
Business device, locally hiding backup region or local read-only zones obtain.
5. according to the method described in claim 4, it is characterized in that, locally hiding backup region passes through not storing equipment
The initial sector in the region of backup file system is mapped with 0 sector of file system and is hidden.
6. a kind of file system recovery device, which is characterized in that described device includes：
Block number determining module, in response to file system corruption, determining the block number of broken parts；
Environmental security detection module, it is whether safe for detecting current environment；
First repair module, in response to current environment safety, the reparation for the file system directly damaged；And
Second repair module, for dangerous in response to current environment, system reboot enters BootLoader patterns, then carries out
The reparation of the file system of damage.
7. device according to claim 6, which is characterized in that first repair module includes：
File acquisition submodule, for obtaining the binary file for reparation according to the block number；
First cryptographic Hash computational submodule, for calculating the cryptographic Hash of acquired binary file；
First comparison sub-module, for the cryptographic Hash of calculating cryptographic Hash corresponding to factory state to be compared；
Sector computational submodule, it is correct for the cryptographic Hash in response to calculating, calculate the corresponding sector of the block number；
Written document submodule, for acquired binary file to be write to calculated sector.
8. device according to claim 6, which is characterized in that second repair module includes：
Submodule is restarted, for system reboot to be made to enter BootLoader patterns；
File acquisition submodule, for obtaining the binary file for reparation according to the block number；
First cryptographic Hash computational submodule, for calculating the cryptographic Hash of acquired binary file；
First comparison sub-module, for the cryptographic Hash of calculating cryptographic Hash corresponding to factory state to be compared；
Sector computational submodule, it is correct for the cryptographic Hash in response to calculating, calculate the corresponding sector of the block number；
Written document submodule, for acquired binary file to be write to calculated sector；
Second cryptographic Hash computational submodule, for each piece of cryptographic Hash of calculation document system；
Second comparison sub-module, the cryptographic Hash cryptographic Hash whether corresponding to factory state for checking each piece of file system
Unanimously；
Cycle repairs submodule, and for the cryptographic Hash in response to any one piece, corresponding cryptographic Hash is inconsistent to factory state, right
The block carries out the same repair process of block with damage.
9. device according to claim 7 or 8, which is characterized in that the binary file for reparation takes from network
Business device, locally hiding backup region or local read-only zones obtain.
10. device according to claim 9, which is characterized in that locally hiding backup region passes through not depositing equipment
The initial sector in the region of deposit part file system is mapped with 0 sector of file system to be hidden.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201711472107.6A CN108255644B (en) | 2017-12-29 | 2017-12-29 | File system recovery method and device |
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| CN201711472107.6A CN108255644B (en) | 2017-12-29 | 2017-12-29 | File system recovery method and device |
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| CN111104248A (en) * | 2018-10-26 | 2020-05-05 | 伊姆西Ip控股有限责任公司 | Method, apparatus and computer program product for verifying cached files |
| CN116560957A (en) * | 2023-04-21 | 2023-08-08 | 珠海云艺网络科技有限公司 | Method, system, device and medium for testing damaged document repair result |
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