CN102331957A - File backup method and device - Google Patents
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- CN102331957A CN102331957A CN201110302038A CN201110302038A CN102331957A CN 102331957 A CN102331957 A CN 102331957A CN 201110302038 A CN201110302038 A CN 201110302038A CN 201110302038 A CN201110302038 A CN 201110302038A CN 102331957 A CN102331957 A CN 102331957A
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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
- G06F11/1458—Management of the backup or restore process
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Abstract
The invention discloses a file backup method and device and belongs to the field of a computer system. The method comprises the following steps: analyzing an entire path name of an unlinked file which is used by a process currently; establishing a temporary directory entry of the unlinked file and marking the entire path name of the temporary directory entry with an identifier; establishing a congruent relationship between the marked entire path name of the temporary directory entry and an index node of a copy of the unlinked file in an internal memory and a congruent relationship between the marked entire path name of the temporary directory entry and the entire path name of the unlinked file; and storing the marked entire path name of the temporary directory entry into an image file, thereby finishing the back-up of the unlinked file. According to the method, the back-up of the unlinked file is realized by correctly analyzing the entire path name of the unlinked file and establishing the temporary directory entry of the unlinked file.
Description
Technical field
The present invention relates to field of computer, particularly a kind of method of file backup and device.
Background technology
Operation to file in (SuSE) Linux OS is managed through operating right, and basic operating right comprises to be read (read), write (write) and carry out (execute).For the file on the disk; Be not to be used with the mode of monopolizing; Even a file that is being used, as long as some processes have the write permission and execution authority of this document place catalogue, this document and directory entry thereof can be by this process-kills so.Source file on this disk and directory entry thereof by deletion but the file that copy in internal memory is still used by process just be called as and do not have link (unlinked) file.For the unlinked file,, can't be again have access to this document through its comspec though in internal memory, still can be used by process.For example, NFS (Network File System, NFS) in, it is numerous that the process A on client computer has deleted on the server the scene of the file that is used by the process B on another client computer, will produce a lot of unlinked files like this.
In the Application Backup and restoring system under the existing Linux environment, when backup, the traversal process is saved in the metadata information of each file in the file table and the comspec of file in the image file when the file table of the file of front opening; When reduction, restore All Files according to the metadata information and the comspec that are kept in the image file.
But; Prior art is when backup; The unlinked file that is using to above-mentioned process; Because kernel is not supported the parsing to the comspec of unlinked file at present, therefore can't obtain the comspec of unlinked file, so prior art can't realize the backup to the unlinked file.
Summary of the invention
In order to realize the backup to the unlinked file, the embodiment of the invention provides a kind of method and device of file backup, and technical scheme is following:
On the one hand, a kind of method of file backup is provided, said method comprises:
The comspec of the no chained file of the current use of parsing process;
Create the temp directory item of said no chained file, and with the comspec of the said temp directory item of identity marking;
Set up the corresponding relation between the index node of comspec and the copy of said no chained file in internal memory of the temp directory item that said mark crosses, and the corresponding relation between the comspec of the comspec of the temp directory item crossed of said mark and said no chained file;
The comspec of the temp directory item that said mark is crossed is saved in the image file, accomplishes the backup of said no chained file.
On the other hand, a kind of device of file backup is provided, said device comprises: backup module;
Said backup module comprises:
Resolution unit is used for the comspec of the no chained file of the current use of parsing process;
Create the unit, be used to create the temp directory item of said no chained file, and with the comspec of the said temp directory item of identity marking;
The corresponding relation administrative unit; Be used for setting up the comspec and the corresponding relation of said no chained file between the index node of the copy of internal memory of the temp directory item that said establishment unit mark crosses, and the corresponding relation between the comspec of the comspec of the temp directory item crossed of said establishment unit mark and the no chained file that said resolution unit is resolved;
Preserve the unit, the comspec of the temp directory item that is used for said establishment unit mark is crossed is saved in image file, accomplishes the backup of said no chained file.
The beneficial effect that the technical scheme that the embodiment of the invention provides is brought is:
Separate out the comspec of no chained file through correct Solution; And create the temp directory item of this no chained file; And then the corresponding relation between the index node of comspec through setting up this temp directory item and the copy of this no chained file in internal memory and and the comspec of this no chained file between corresponding relation; Realized backup to no chained file; What remedied the no chained file that in Application Backup and the restoring system under the Linux environment process used can't back up this function breach, has promoted the functional completeness of Application Backup and restoring system.
Description of drawings
In order to be illustrated more clearly in the technical scheme in the embodiment of the invention; The accompanying drawing of required use is done to introduce simply in will describing embodiment below; Obviously, the accompanying drawing in describing below only is some embodiments of the present invention, for those of ordinary skills; Under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is the method flow diagram of the file backup that provides of the embodiment of the invention one;
Fig. 2 is the method flow diagram of the file backup that provides of the embodiment of the invention two;
Fig. 3 is the method flow diagram of the file reduction that provides of the embodiment of the invention two;
Fig. 4 is the apparatus structure synoptic diagram of the file backup that provides of the embodiment of the invention three;
Fig. 5 is the structural representation of the backup module that provides of the embodiment of the invention three;
Fig. 6 is the structural representation of the recovery module that provides of the embodiment of the invention three;
Fig. 7 is the structural representation of the another kind of recovery module that provides of the embodiment of the invention three.
Embodiment
For making the object of the invention, technical scheme and advantage clearer, will combine accompanying drawing that embodiment of the present invention is done to describe in detail further below.
Embodiment one
The embodiment of the invention provides a kind of method of file backup, and referring to Fig. 1, method flow comprises:
101: the comspec of the unlinked file of the current use of parsing process;
102: create the temp directory item of this unlinked file, and with the comspec of this temp directory item of identity marking;
103: set up the corresponding relation between the index node of comspec and the copy of this unlinked file in internal memory of the temp directory item that this mark crosses, and the corresponding relation between the comspec of the comspec of the temp directory item crossed of this mark and this unlinked file;
104: the comspec of the temp directory item that this mark is crossed is saved in the image file, accomplishes the backup of this unlinked file.
The method that the embodiment of the invention provides; Separate out the comspec of unlinked file through correct Solution; And create the temp directory item of this unlinked file; And then the corresponding relation between the index node of comspec through setting up this temp directory item and the copy of this unlinked file in internal memory and and the comspec of this unlinked file between corresponding relation; Realized the backup to the unlinked file, what remedied the unlinked file that in Application Backup and the restoring system under the Linux environment process used can't back up this function breach, has promoted the functional completeness of Application Backup and restoring system.
Embodiment two
The embodiment of the invention provides the method for a kind of file backup and reduction, is used to realize the backup-and-restore of unlinked file that process is being used.When backup, referring to Fig. 2, the method for file backup comprises:
201: the comspec of the unlinked file of the current use of parsing process;
Particularly; Existing application backup-and-restore system is when backup; The comspec analytical algorithm d_path of file does not support the comspec of unlinked file is resolved, and this is because this algorithm can be a unlinked to the file that will resolve to be judged, when judging that the file that will resolve is a unlinked file; This algorithm can think that it is insignificant that the pathname of unlinked file is resolved, and then will refuse to resolve the comspec of this unlinked file.The method that the embodiment of the invention provides; Can be in this a system self-defined cover comspec analytical algorithm; This comspec analytical algorithm can improve on the basis of d_path algorithm and obtain; When the comspec of resolution file, do not go to judge promptly that this file that will resolve is the unlinked file, but directly resolve the comspec of this document.The mode of the comspec of this arithmetic analysis unlinked file specifically can be: each layer pathname that from internal memory, obtains this unlinked file in the data structure relevant with this unlinked file; Each layer pathname that successively will obtain is stitched together with path decollator "/", obtains the comspec of this unlinked file.The comspec of this unlinked file that for example, parses is "/root/fileA ".
202: create the temp directory item of this unlinked file, and with the comspec of this temp directory item of identity marking;
Particularly; Though parsed the comspec of this unlinked file; But can't obtain fileinfo according to this comspec this moment, therefore, under a certain catalogue of the file system under this unlinked file, creates a temp directory item; Be used for substituting the comspec of this unlinked file, so that can correctly get access to the fileinfo of this unlinked file.For example, the comspec of the temp directory item of establishment is "/root/.tmp_unlinked/fileA ".
Further, behind good this temp directory item of establishment, with the comspec of this temp directory item of identity marking, this sign is used to represent that this comspec is an interim comspec that substitutes, so that when reduction, can be identified.The embodiment of the invention does not limit which type of sign of concrete employing.
203: set up the corresponding relation between the index node of comspec and the copy of this unlinked file in internal memory of the temp directory item that this mark crosses;
Particularly, because this unlinked file is used by process, therefore the copy of this unlinked file is arranged in internal memory.Set up the corresponding relation between the index node of comspec and this copy of the temp directory item that this mark crosses; So that the comspec of the temp directory item that can cross through this mark in when reduction has access to this index node, and then from copy, obtains the fileinfo of this unlinked file through this index node.Wherein, this corresponding relation can be realized through hard link, also can realize through soft link.
204: set up the corresponding relation between the comspec of comspec and this unlinked file of the temp directory item that this mark crosses;
Particularly, can in the corresponding relation administrative unit, increase clauses and subclauses, write down the comspec of the temp directory item that this mark crosses and the comspec of the unlinked file that its substitutes.The corresponding relation administrative unit is used to manage the corresponding relation between the comspec of comspec and unlinked file of temp directory item, and the backup operation of whenever carrying out a unlinked file all need be added the clauses and subclauses of a correspondence in this unit.
Need to prove that above-mentioned 203 and 204 execution sequence both can carry out 203 earlier in no particular order, carried out 204 again, also can carry out 204 earlier, carried out 203 again, the embodiment of the invention is not done concrete qualification to this.
205: the comspec of the temp directory item that this mark is crossed is saved in the image file, accomplishes the backup of this unlinked file.
Particularly, the comspec of the temp directory item that this mark of usefulness is crossed replaces the comspec of this unlinked file to be saved in the image file, for example, is saved in the image file with "/root/.tmp_unlinked/fileA " replacement "/root/fileA ".
After accomplishing backup, when reduction, referring to Fig. 3, the method for file reduction comprises:
301: from image file, read comspec;
Wherein, the information such as comspec of the file of backup have been preserved in the image file, "/root/.tmp_unlinked/fileA ", "/root/fileB " or the like.
302: judge whether the comspec that reads has sign, if sign is arranged, then carries out 303,, then reduce that flow process finishes according to the method for reducing to non-unlinked file in the prior art if do not identify;
Particularly; Check whether the comspec that reads has sign; If sign is arranged, then judge the comspec of the temp directory item that this comspec that reads is the unlinked file, that is to say; This comspec that reads is the interim alternative route name of a unlinked file, needs to restore this unlinked file according to this interim alternative route name; If sign does not explain that then this comspec that reads is not interim alternative route name, then can reduce according to the method for reducing to non-unlinked file in the prior art, flow process finishes.
For example, the example above the continuity is if the comspec that reads is "/root/.tmp_unlinked/fileA "; It has sign, then carries out 303, if the comspec that reads is "/root/fileB "; It is sign not, then reduces according to method of reducing of the prior art, and flow process finishes.
303: obtain corresponding index node according to the comspec that reads, and obtain the fileinfo of this unlinked file according to the index node that obtains;
Particularly; Because the comspec that reads is an interim alternative route name; Therefore can be according to the comspec of the temp directory item of setting up in 203 and the corresponding relation between the index node; Obtain the index node corresponding, and read concrete fileinfo through using the corresponding interface function to internal memory from disk according to this index node with this comspec that reads.
Wherein, this document information comprises the metadata information of file and concrete file content etc., and this metadata information comprises size, creation-time, modification time of file or the like.
304: the comspec that obtains the unlinked file of the comspec correspondence that reads;
Particularly; Can be according to the corresponding relation between the comspec of the comspec of the temp directory item of setting up in 204 and unlinked file; Obtain the comspec of the corresponding unlinked file of this comspec that reads, for example, in the corresponding relation administrative unit, search the corresponding clauses and subclauses of this comspec that reads; And therefrom obtain the comspec of this unlinked file that comspec substituted that reads, obtain accomplish after with this clauses and subclauses deletion.
305: the fileinfo that obtains is reverted under the corresponding directory entry of the comspec of this unlinked file;
Particularly, move under the corresponding directory entry of the comspec of this unlinked file, accomplish the reduction of this unlinked file getting access to fileinfo in the internal memory.
306: remove this comspec that reads of foundation when backup and the corresponding relation between this index node that obtains, and delete the corresponding temp directory item of this comspec that reads.
Particularly; After the unlinked file that this comspec that obtains is corresponding has reduced; Corresponding relation between this comspec that releasing is created when backup and the corresponding index node, and the temp directory entry deletion that this comspec that reads is corresponding, the redundant data on the defrag.
The method that the embodiment of the invention provides; Separate out the comspec of unlinked file through correct Solution; And create the temp directory item of this unlinked file; And then the corresponding relation between the index node of comspec through setting up this temp directory item and the copy of this unlinked file in internal memory and and the comspec of this unlinked file between corresponding relation; Realized the backup-and-restore to the unlinked file, what remedied the unlinked file that in Application Backup and the restoring system under the Linux environment process used can't this function breach of backup-and-restore, has promoted the functional completeness of Application Backup and restoring system.
Embodiment three
The embodiment of the invention provides a kind of device of file backup, can realize the method step among the foregoing description one and the embodiment two.This device comprises backup module 401, and referring to Fig. 4, alternatively, this device can also comprise recovery module 402;
Referring to Fig. 5, backup module 401 comprises:
Create unit 401b, be used to create the temp directory item of this unlinked file, and with the comspec of this temp directory item of identity marking;
Corresponding relation administrative unit 401c; Be used for setting up comspec and the corresponding relation of this unlinked file between the index node of the copy of internal memory of creating the temp directory item that unit 401b mark crosses, and create the corresponding relation between the comspec of the comspec of the temp directory item that unit 401b mark crosses and the unlinked file that resolution unit 401a resolves;
Further, resolution unit 401a specifically is used for from the internal memory data structure relevant with this unlinked file, obtaining each layer pathname of this unlinked file; Successively each layer pathname is stitched together with the path decollator, obtains the comspec of this unlinked file.
Referring to Fig. 6, recovery module 402 comprises:
Reading unit 402a is used for reading comspec from image file;
Judging unit 402b is used to judge whether the comspec that reading unit 402a reads has sign, if sign is arranged, then judges the comspec of the temp directory item that this comspec that reads is the unlinked file;
The first acquiring unit 402c; Be used for after judging unit 402b judges the comspec of the temp directory item that this comspec that reads is the unlinked file; Obtain corresponding index node according to this comspec that reads, and obtain the fileinfo of this unlinked file according to the index node that obtains;
Further, referring to Fig. 7, recovery module 402 also comprises:
In sum; The embodiment of the invention is separated out the comspec of unlinked file through correct Solution; And create the temp directory item of this unlinked file; And then the corresponding relation between the index node of comspec through setting up this temp directory item and the copy of this unlinked file in internal memory and and the comspec of this unlinked file between corresponding relation; Realized the backup-and-restore to the unlinked file, what remedied the unlinked file that in Application Backup and the restoring system under the Linux environment process used can't this function breach of backup-and-restore, has promoted the functional completeness of Application Backup and restoring system.
Need to prove: the device of the file backup that the foregoing description provides is when the backup-and-restore file; Only the division with above-mentioned each functional module is illustrated; In the practical application; Can as required above-mentioned functions be distributed by the different functional completion, the inner structure that is about to device is divided into different functional, to accomplish all or part of function of above description.In addition, the device of the file backup that the foregoing description provides and the method embodiment of file backup belong to same design, and its concrete implementation procedure sees method embodiment for details, repeats no more here.
The invention described above embodiment sequence number is not represented the quality of embodiment just to description.
The all or part of step that one of ordinary skill in the art will appreciate that realization the foregoing description can be accomplished through hardware; Also can instruct relevant hardware to accomplish through program; Described program can be stored in a kind of computer-readable recording medium; The above-mentioned storage medium of mentioning can be a ROM (read-only memory), disk or CD etc.
The above is merely preferred embodiment of the present invention, and is in order to restriction the present invention, not all within spirit of the present invention and principle, any modification of being done, is equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (8)
1. the method for a file backup is characterized in that, said method comprises:
The comspec of the no chained file of the current use of parsing process;
Create the temp directory item of said no chained file, and with the comspec of the said temp directory item of identity marking;
Set up the corresponding relation between the index node of comspec and the copy of said no chained file in internal memory of the temp directory item that said mark crosses, and the corresponding relation between the comspec of the comspec of the temp directory item crossed of said mark and said no chained file;
The comspec of the temp directory item that said mark is crossed is saved in the image file, accomplishes the backup of said no chained file.
2. method according to claim 1 is characterized in that, the comspec of the no chained file of the current use of parsing process comprises:
From internal memory, obtain each layer pathname of said no chained file in the data structure relevant with said no chained file;
Successively said each layer pathname is stitched together with the path decollator, obtains the comspec of said no chained file.
3. according to claim 1 or the described method of claim 2, it is characterized in that said method also comprises:
From said image file, read comspec;
Judge whether the comspec that reads has sign,, then judge the comspec of the said comspec that reads for the temp directory item of no chained file if sign is arranged;
Obtain corresponding index node according to the said comspec that reads, and obtain the fileinfo of said no chained file according to the index node that obtains;
Obtain the comspec of the corresponding said no chained file of the said comspec that reads;
The said fileinfo that obtains is reverted under the corresponding directory entry of the comspec of said no chained file.
4. method according to claim 3 is characterized in that, with the said fileinfo that obtains revert to the corresponding directory entry of the comspec of said no chained file down after, also comprise:
Remove the corresponding relation between said comspec that reads and the said index node that obtains, and delete the corresponding temp directory item of the said comspec that reads.
5. the device of a file backup is characterized in that, said device comprises: backup module;
Said backup module comprises:
Resolution unit is used for the comspec of the no chained file of the current use of parsing process;
Create the unit, be used to create the temp directory item of said no chained file, and with the comspec of the said temp directory item of identity marking;
The corresponding relation administrative unit; Be used for setting up the comspec and the corresponding relation of said no chained file between the index node of the copy of internal memory of the temp directory item that said establishment unit mark crosses, and the corresponding relation between the comspec of the comspec of the temp directory item crossed of said establishment unit mark and the no chained file that said resolution unit is resolved;
Preserve the unit, the comspec of the temp directory item that is used for said establishment unit mark is crossed is saved in image file, accomplishes the backup of said no chained file.
6. device according to claim 5 is characterized in that, said resolution unit specifically is used for from the internal memory data structure relevant with said no chained file, obtaining each layer pathname of said no chained file; Successively said each layer pathname is stitched together with the path decollator, obtains the comspec of said no chained file.
7. according to claim 5 or the described device of claim 6, it is characterized in that said device also comprises: recovery module;
Said recovery module comprises:
Reading unit is used for reading comspec from said image file;
Judging unit is used to judge whether the comspec that said reading unit reads has sign, if sign is arranged, then judges the comspec of the said comspec that reads for the temp directory item of no chained file;
First acquiring unit; Be used for after said judging unit is judged the comspec of the said comspec that reads for the temp directory item of no chained file; Obtain corresponding index node according to the said comspec that reads, and obtain the fileinfo of said no chained file according to the index node that obtains;
Second acquisition unit is used for after said judging unit is judged the comspec of the said comspec that reads for the temp directory item of no chained file, obtaining the comspec of the corresponding said no chained file of the said comspec that reads;
Reduction unit is used for the said fileinfo that said first acquiring unit obtains is reverted under the corresponding directory entry of the comspec of the no chained file that said second acquisition unit obtains.
8. device according to claim 7 is characterized in that, said recovery module also comprises:
The cleaning unit is used for after said reduction unit has reduced, and removes the corresponding relation between said comspec that reads and the said index node that obtains, and deletes the corresponding temp directory item of the said comspec that reads.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110302038 CN102331957B (en) | 2011-09-28 | 2011-09-28 | File backup method and device |
| PCT/CN2012/082248 WO2013044837A1 (en) | 2011-09-28 | 2012-09-28 | File backup method and device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110302038 CN102331957B (en) | 2011-09-28 | 2011-09-28 | File backup method and device |
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| Publication Number | Publication Date |
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| CN102331957A true CN102331957A (en) | 2012-01-25 |
| CN102331957B CN102331957B (en) | 2013-08-28 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 201110302038 Expired - Fee Related CN102331957B (en) | 2011-09-28 | 2011-09-28 | File backup method and device |
Country Status (2)
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| CN (1) | CN102331957B (en) |
| WO (1) | WO2013044837A1 (en) |
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| CN103645905B (en) * | 2013-12-20 | 2017-08-08 | 北京中电普华信息技术有限公司 | A kind of incremental data acquisition method and device |
| CN104484240A (en) * | 2014-12-09 | 2015-04-01 | 青岛海信宽带多媒体技术有限公司 | Method and device for storing terminal data |
| CN104615507A (en) * | 2015-02-13 | 2015-05-13 | 广东欧珀移动通信有限公司 | Backup data batch reduction method and device |
| CN105095025A (en) * | 2015-08-28 | 2015-11-25 | 小米科技有限责任公司 | Method and apparatus for recovering deleted file in ext file system |
| CN105045686A (en) * | 2015-08-28 | 2015-11-11 | 小米科技有限责任公司 | File recovery method and apparatus |
| CN105045686B (en) * | 2015-08-28 | 2019-03-01 | 小米科技有限责任公司 | File access pattern method and device |
| CN106557384A (en) * | 2015-09-25 | 2017-04-05 | 中兴通讯股份有限公司 | Based on the data processing method of Linux, device and system |
| CN106557384B (en) * | 2015-09-25 | 2020-10-02 | 南京中兴软件有限责任公司 | Data processing method, device and system based on Linux |
| CN107239480A (en) * | 2016-03-28 | 2017-10-10 | 阿里巴巴集团控股有限公司 | The method and apparatus that renaming operation is performed for distributed file system |
| CN107239480B (en) * | 2016-03-28 | 2021-01-29 | 阿里巴巴集团控股有限公司 | Method and apparatus for performing renaming operations for distributed file systems |
| CN107436952A (en) * | 2017-08-15 | 2017-12-05 | 郑州云海信息技术有限公司 | A kind of document copying method and device based on distributed memory system |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2013044837A1 (en) | 2013-04-04 |
| CN102331957B (en) | 2013-08-28 |
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