CN104991926A - File system recovery method and system - Google Patents
File system recovery method and system Download PDFInfo
- Publication number
- CN104991926A CN104991926A CN201510370100.8A CN201510370100A CN104991926A CN 104991926 A CN104991926 A CN 104991926A CN 201510370100 A CN201510370100 A CN 201510370100A CN 104991926 A CN104991926 A CN 104991926A
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- China
- Prior art keywords
- file
- subregion
- fault
- superblock
- file system
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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
- G06F11/1446—Point-in-time backing up or restoration of persistent data
- G06F11/1448—Management of the data involved in backup or backup restore
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F16/00—Information retrieval; Database structures therefor; File system structures therefor
- G06F16/10—File systems; File servers
- G06F16/11—File system administration, e.g. details of archiving or snapshots
Abstract
The invention provides a file system recovery method and system, relates to the field of system management, and solves the problem of data loss in a file system recovery process. The method comprises the steps of: when a partition fault occurs, searching a superblock file of a partition of a fault; according to the superblock file, recovering the partition of the fault; and after finishing the recovery of the partition of the fault, remounting the partition. According to the technical scheme provided by the invention, the file system recovery method is suitable for a data partition file system, and the repair of a file system is finished through the superblock file.
Description
Technical field
The present invention relates to field of system management, particularly relate to a kind of file system recovery method and device.
Background technology
In actual applications, some maloperations cause destruction to the file system of the subregion having data unavoidably, and subregion cannot complete carry, now want the carry proceeding subregion, can only reformat subregion or recover original file system.Reformat the loss that subregion can cause original all data, this mode is lost larger, and also there are some shortcomings in the method for recovery file system, certain methods also can cause loss that is a lot of or total data when recovering original file system, cannot play the effect that as far as possible few minimizing legacy data is lost.
Summary of the invention
The invention provides a kind of file system recovery method and system, solve the problem of loss of data in file system recovery process.
A kind of file system recovery method, comprising:
When there is subregion fault, the superblock file of the subregion of looking up the fault;
According to described superbock file, recover the subregion of described fault;
After the partition recovery of described fault is completed, this subregion of carry again.
Preferably, the superblock file of the subregion of looking up the fault is specially:
1024B-2048B to superblock file is copied in the file of the subregion of described fault.
Preferably, according to described superbock file, the subregion recovering described fault comprises:
Binary described superblock file transform is become the form of 16 systems;
Verify the correctness of 16 system superblock files, obtain the number of inodes and the number of block that superblock file header records;
According to the number of described inodes and the number of block, recover the subregion of described fault.
Preferably, described when there is subregion fault, before the step of the superblock file of the subregion of looking up the fault, also comprise:
Format is carried out and carry to disk partition.
Preferably, operating environment is linux system.
Present invention also offers a kind of file system recovery system, comprising:
File polling module, for when there is subregion fault, the superblock file of the subregion of looking up the fault;
Fault restoration module, for according to described superbock file, recovers the subregion of described fault;
Carry module, for after completing the partition recovery of described fault, this subregion of carry again.
Preferably, described file polling module, specifically for
1024B-2048B to superblock file is copied in the file of the subregion of described fault.
Preferably, described fault restoration module comprises:
Converting unit, for becoming the form of 16 systems by binary described superblock file transform;
Authentication unit, for verifying the correctness of 16 system superblock files, obtains the number of inodes and the number of block that superblock file header records;
Recovery unit, for according to the number of described inodes and the number of block, recovers the subregion of described fault.
Preferably, described carry module, also for when system initialization, carries out format and carry to disk partition.
The invention provides a kind of file system recovery method and system, when there is subregion fault, the superblock file of the subregion of looking up the fault, according to described superbock file, recover the subregion of described fault, and after the partition recovery of described fault is completed, this subregion of carry again.Completed the reparation of file system by superbock file, solve the problem of loss of data in file system recovery process.
Accompanying drawing explanation
The process flow diagram of a kind of file system recovery method that Fig. 1 provides for embodiments of the invention one;
Fig. 2 is the physical storage structure schematic diagram of subregion;
The structural representation of a kind of file system recovery system that Fig. 3 provides for embodiments of the invention two;
Fig. 4 is the structural representation of fault restoration module 302 in Fig. 3.
Embodiment
Hereinafter will be described in detail to embodiments of the invention by reference to the accompanying drawings.It should be noted that, when not conflicting, the embodiment in the application and the feature in embodiment can combination in any mutually.
First by reference to the accompanying drawings embodiments of the invention one are described.
Embodiments provide a kind of file system recovery method, use the method to complete to the flow process of file system fault handling as shown in Figure 1, comprising:
The installation of step 101, operating system;
In this step, linux system is installed, as installed redhat6.4 operating system.
Step 102, subregion is carried out to sdb, format, carry.
Step 103, detection file system fault.
Can also the simulation files system failure, as used dd to the sdb1 simulation files system failure.
Instruction: dd if=/dev/null of=/dev/mnt count=1000bs=4K.
Step 104, occur subregion fault time, the superblock Fileview file system of the subregion of looking up the fault;
After there is sdb1 file system corruption in step 103, carry cannot be carried out.
Search superblock immediately.Concrete, copy from/dev/sdb1 the 1024B-2048B position of superblock (Here it is) is superblock file to one.
The instruction used is: dd if=/dev/sdb1bs=1k skip=1count=1of=superblock.
Wherein, bs=1k is the block size at every turn read and write;
Skip=1, shows to offset how many BOB(beginning of block)s and reads (block is bs=1k, skew 1, represent from 1k read) here;
Count=1, represents the size (represent and read 1k) read here;
Where if, of, represent read and write wherefrom respectively.
With reference to figure 2, the physical storage structure for subregion:
Can see in Fig. 2 that first 1k place of first Block is the Boot Block stored, and superblock is from 1k, size is 1k.
Step 105, according to described superbock file, recover the subregion of described fault.
This step specifically comprises:
1, superblock file is checked;
Open the superblock file copying out from/dev/sda3 with vim, owing to being binary file, use after opening with vim: Xxd converts 16 binary form to.
Like this, the form of superblock on disk is just obtained.
2, superblock correctness is verified;
First, by checking/usr/include/linux/ext3_fs.h header file in structext3_super_block, can know and record the number of inodes and the number of block on the head of superblock file, they are 32.
As can be seen from superblock:
Inodes_count:00003a04 (notes: be decimal end) – >043a0000=70909952 here
blocks_count:fdc43904–>0439c4fd＝70894845dumpe2fs/dev/sda3|less
Following output (part) can be seen:
Inode count:70909952
Block count:70894845
3, superblock recovery file system is used;
[
root@localhost～]#e2fsck-b 32768/dev/sdb1
e2fsck 1.41.12(17-May-2010)
/dev/sdb1was not cleanly unmounted,check forced.
Resize inode not valid.Recreate<y>？cancelled！
[
root@localhost～]#e2fsck-b 32768/dev/sdb1
e2fsck 1.41.12(17-May-2010)
/dev/sdb1was not cleanly unmounted,check forced.
Resize inode not valid.Recreate<y>？yes
Pass 1:Checking inodes,blocks,and sizes
Pass 2:Checking directory structure
Pass 3:Checking directory connectivity
Pass 4:Checking reference counts
Pass 5:Checking group summary information
Free blocks count wrong for group#0(24975,counted＝24974).
Fix<y>？yes
Free blocks count wrong for group#1(32647,counted＝32644).
Fix<y>？yes
Free blocks count wrong(471602,counted＝471598).
Fix<y>？yes
Free inodes count wrong for group#0(8133,counted＝8128).
Fix<y>？yes
Directories count wrong for group#0(2,counted＝4).
Fix<y>？yes
Free inodes count wrong(122149,counted＝122144).
Fix<y>？yes
/dev/sdb1:*****FILE SYSTEM WAS MODIFIED*****
/dev/sdb1:16/122160files(6.3％non-contiguous),16594/488192blocks
Here can see that file system is recovered.
Step 106, after the partition recovery of described fault is completed, this subregion of carry again.
Again carry/dev/sdb1 can see the normal carry of energy, file free of losses.
Below in conjunction with accompanying drawing, embodiments of the invention two are described.
Embodiments provide a kind of file system recovery system, its structure as shown in Figure 3, comprising:
File polling module 301, for when there is subregion fault, the superblock file of the subregion of looking up the fault;
Fault restoration module 302, for according to described superbock file, recovers the subregion of described fault;
Carry module 303, for after completing the partition recovery of described fault, this subregion of carry again.
Preferably, described file polling module 301, specifically for
1024B-2048B to superblock file is copied in the file of the subregion of described fault.
Preferably, the structure of described fault restoration module 302 as shown in Figure 4, comprising:
Converting unit 3021, for becoming the form of 16 systems by binary described superblock file transform;
Authentication unit 3022, for verifying the correctness of 16 system superblock files, obtains the number of inodes and the number of block that superblock file header records;
Recovery unit 3023, for according to the number of described inodes and the number of block, recovers the subregion of described fault.
Preferably, described carry module 303, also for when system initialization, carries out format and carry to disk partition.
The embodiment provides a kind of file system recovery method and system, when there is subregion fault, the superblock file of the subregion of looking up the fault, according to described superbock file, recover the subregion of described fault, and after the partition recovery of described fault is completed, this subregion of carry again.Completed the reparation of file system by superbock file, solve the problem of loss of data in file system recovery process, the loss that maloperation causes data can be reduced in linux system.
One of ordinary skill in the art will appreciate that all or part of step of above-described embodiment can use computer program flow process to realize, described computer program can be stored in a computer-readable recording medium, described computer program (as system, unit, device etc.) on corresponding hardware platform performs, when performing, step comprising embodiment of the method one or a combination set of.
Alternatively, all or part of step of above-described embodiment also can use integrated circuit to realize, and these steps can be made into integrated circuit modules one by one respectively, or the multiple module in them or step are made into single integrated circuit module to realize.Like this, the present invention is not restricted to any specific hardware and software combination.
Each device/functional module/functional unit in above-described embodiment can adopt general calculation element to realize, and they can concentrate on single calculation element, also can be distributed on network that multiple calculation element forms.
Each device/functional module/functional unit in above-described embodiment using the form of software function module realize and as independently production marketing or use time, can be stored in a computer read/write memory medium.The above-mentioned computer read/write memory medium mentioned can be ROM (read-only memory), disk or CD etc.
Anyly be familiar with those skilled in the art in the technical scope that the present invention discloses, change can be expected easily or replace, all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection domain described in claim.
Claims (9)
1. a file system recovery method, is characterized in that, comprising:
When there is subregion fault, the superblock file of the subregion of looking up the fault;
According to described superbock file, recover the subregion of described fault;
After the partition recovery of described fault is completed, this subregion of carry again.
2. file system recovery method according to claim 1, is characterized in that, the superblock file of the subregion of looking up the fault is specially:
1024B-2048B to superblock file is copied in the file of the subregion of described fault.
3. file system recovery method according to claim 1, is characterized in that, according to described superbock file, the subregion recovering described fault comprises:
Binary described superblock file transform is become the form of 16 systems;
Verify the correctness of 16 system superblock files, obtain the number of inodes and the number of block that superblock file header records;
According to the number of described inodes and the number of block, recover the subregion of described fault.
4. file system recovery method according to claim 1, is characterized in that, described when there is subregion fault, before the step of the superblock file of the subregion of looking up the fault, also comprises:
Format is carried out and carry to disk partition.
5., according to the arbitrary described file system recovery method of Claims 1-4, it is characterized in that, operating environment is linux system.
6. a file system recovery system, is characterized in that, comprising:
File polling module, for when there is subregion fault, the superblock file of the subregion of looking up the fault;
Fault restoration module, for according to described superbock file, recovers the subregion of described fault;
Carry module, for after completing the partition recovery of described fault, this subregion of carry again.
7. file system recovery system according to claim 6, is characterized in that, described file polling module, specifically for
1024B-2048B to superblock file is copied in the file of the subregion of described fault.
8. file system recovery system according to claim 6, is characterized in that, described fault restoration module comprises:
Converting unit, for becoming the form of 16 systems by binary described superblock file transform;
Authentication unit, for verifying the correctness of 16 system superblock files, obtains the number of inodes and the number of block that superblock file header records;
Recovery unit, for according to the number of described inodes and the number of block, recovers the subregion of described fault.
9. file system recovery system according to claim 6, is characterized in that,
Described carry module, also for when system initialization, carries out format and carry to disk partition.
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| CN201510370100.8A CN104991926A (en) | 2015-06-29 | 2015-06-29 | File system recovery method and system |
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| CN201510370100.8A CN104991926A (en) | 2015-06-29 | 2015-06-29 | File system recovery method and system |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109213629A (en) * | 2018-07-02 | 2019-01-15 | 广东睿江云计算股份有限公司 | A kind of union file system failure self-recovery method and device |
| CN111209138A (en) * | 2018-11-22 | 2020-05-29 | 浙江宇视科技有限公司 | Operation and maintenance method and device of data storage system |
| CN111984195A (en) * | 2020-08-19 | 2020-11-24 | 广州邦讯信息系统有限公司 | Method and device for improving stability of embedded Linux system |
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Cited By (4)
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