CN1553325A - Method for transparent extending document system function - Google Patents
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- CN1553325A CN1553325A CNA031381251A CN03138125A CN1553325A CN 1553325 A CN1553325 A CN 1553325A CN A031381251 A CNA031381251 A CN A031381251A CN 03138125 A CN03138125 A CN 03138125A CN 1553325 A CN1553325 A CN 1553325A
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Abstract
In the method, the request is submitted to VFS layer processing function by system calling interface first when request for a file system is launched by application program, then request is submitted to interlayer file system by VFS through standard calling interface, transaction is submitted to specific file system of bottom layer after special transaction processing is carried out by inter layer file system and finally actual data access or data input and output is carried out by bottom file system.
Description
Technical field
The present invention relates to a kind of method that strengthens file system function, particularly relate to a kind of method of the systemic-function of extended file pellucidly, so-called " transparent " refers to the user and user's attitude program can't be intervened.
Background technology
All computer programs are all wanted canned data and retrieving information.For the information of longer-term storage, following three requirements are arranged: the one, enough space canned datas be arranged.The 2nd, when the procedure termination of the information of use, information must preserve.The 3rd, a plurality of processes can concurrent access information.The common method that satisfies above three requirements is that the unit of information with a kind of being referred to as " file " is kept on disk or other the exterior storage medium.File is managed by operating system.The access of the name of file, the distribution of storage space, file and use etc. are all managed by " file system " administrative unit in the operating system.
File system can be regarded as a multi-functional manager, and it is space management device, I/O manager, catalog manager, and it still is a task manager for special Journaling File System.A kind of operating system can be supported multiple different file system, and for example the file system that can support of (SuSE) Linux OS has ext2, ext3, jfs, Reiserfs, xfs etc.In order to support various file system, a lot of operating systems have just been considered compatibility at the beginning of design, and UFS is exactly the standard file system interface of UNIX, can move on UNIX as long as meet the file system of this standard.So just be born subsystem-VFS (Virtual File System) Virtual File System layer of a kernel, it supports various file system as a switch.VFS provides incompatible management of the operation set of series of standards and operation file, and these operational set all are to be defined by relevant function pointer.Operating system is submitted to the VFS layer with various request to file system by system call interfaces.The VFS layer decides this request by which bottom document system to be realized, thereby calls the operational processes function of corresponding document system through judging.
Various file system all have the speciality of oneself, and the file system that has is write the performance height of big file; Some file is strong to the processing power of small documents; Journaling File System can record in the daily record and go changing each operation of file system, in case system crash, can be according to the consistance of the quick recovery file of daily record system.But file system whatsoever, the function that it offers the user is identical substantially, nothing more than to the access of file and the management of catalogue etc.If the user wishes that file system provides extra additional function, usual way is a realization function of revising concrete file system, according to user's demand, adds the processing to affairs.But this way has two shortcomings, if being exactly the user, one wishes that multiple file system all provides its needed function, just must revise the code of concrete file system one by one, the result who does so both had been unfavorable for the integrality of original file system code, and compatibility is also very poor simultaneously.The suggestion that someone has proposed modification VFS layer solves compatible problem, but the cost of doing like this is exactly a standard of having destroyed the VFS layer, still can't resolve the another one problem simultaneously.The another one problem is exactly, and like this to file system modification, not satisfying the user increases at any time or cancel the requirement that particular transaction is handled, and dirigibility is very poor.
Summary of the invention
The objective of the invention is to,, provide a kind of method of transparent extended file systemic-function according to the specific demand of different user.The present invention can also make the user start as required at any time or close the particular transaction of file system is handled, and does not influence original bottom document system.
The method of a kind of transparent extended file systemic-function of the present invention, its file system comprises Virtual File System VFS and bottom document system, between VFS layer standard calls interface and bottom document system interface, also comprise an interlayer file system (Interlayer File System), when an application program is sent the request of a file system, system call interfaces is submitted to this request the VFS layer earlier and is handled function, VFS submits to the interlayer file system by the standard calls interface with request, undertaken after particular transaction handles by this interlayer file system, for example data are encrypted, being redirected etc. of compression or read/write, again affairs are submitted to the concrete file system of bottom, at last, realize actual data access or input and output by the bottom document system.
The method of aforesaid a kind of transparent extended file systemic-function, described interlayer file system are one can load or module that removal loads at any time, and after module was loaded, the interlayer file system was intercepted and captured the request that VFS submits to downwards; After the Unload module, then recover original operating process, the VFS layer directly will ask to submit the bottom document system to, by the various requests of bottom document system specific implementation.
The method of the invention can be on original multiple file system basis of having realized, intercept and capture the request of file system, encapsulate the processing of oneself, strengthen the function of file system, and do not destroy the standard interface of VFS layer and the code integrity of concrete file system, realize various special application.
Description of drawings
Fig. 1 is interlayer file system structure figure;
Fig. 2 writes the treatment scheme of affairs write for system call;
Fig. 3 is the data relation figure of interlayer file system operation set;
Fig. 4 reads the operational flowchart of superblock interlayer_read_super. for the interlayer file system;
Fig. 5 is for creating the handling function interlayer_read_inode process flow diagram of internal memory inode;
Fig. 6 is an interlayer file system write operation interlayer_write process flow diagram.
Embodiment
The present invention is further described in more detail below in conjunction with accompanying drawing.
The notion of the interlayer file system that the present invention proposes is the inspiration that has been subjected to VFS, and VFS be exactly one that can not load and become the interlayer file system of standard.If revised the VFS layer, will require all file system all to pass through the processing of particular transaction, and the dirigibility of loading is restricted.Therefore on the basis of VFS and concrete file system (for example ext2, jfs, xfs etc.), the present invention proposes the notion of interlayer file system.
As shown in Figure 1, the present invention is not real concrete file system of realization, but the standard calls interface that between VFS layer and concrete file system, encapsulates, to realize the function of extended file system.Under the situation of having loaded the interlayer file system, when an application program is sent the request of a file system, system call interfaces should ask to submit to earlier the VFS layer and handle function, VFS submits to the interlayer file system by the standard calls interface with request, undertaken after particular transaction handles by this interlayer file system, as data are encrypted, being redirected etc. of compression or read/write, again affairs are submitted to the concrete file system of bottom, at last, realize actual data access or I/O by the bottom document system.
The standard calls interface that the VFS layer provides comprises four handling function set:
Operational set (super_operations) about superblock;
Operational set (inode_operations) about the i node;
Operation intersection (file_operations) about file;
Operational set (address_space_operations) about address space.Wherein:
Inode_operations, file_operations and address_space_operations directly hang over
On the basic object i node of file system; And super_operations directly is articulated on the superblock of file system; Preserve simultaneously the pointer of superblock on the i node, therefore by the i node can dereference to per_operations.These four structures that operational set all is made up of different function pointers, these function pointers have then pointed to the concrete handling function that file system realized.The VFS layer is submitted to concrete file system with the request of various file system by calling of these four operation sets.Therefore, only need to realize these four operational set, and the own operational set that realizes is covered function pointer on i node and the superblock, just can intercept and capture the request of the downward submission of VFS.
In addition, in order to increase the dirigibility of system, the implementation rule of the loadable module that provides according to operating system, by the interlayer file system is embodied as loadable module, at any time can be in the kernel of operating system according to the dynamic loading and unloading interlayer of user's demand file system, realize starting and close processing procedure to the particular transaction of file system.
Fig. 2 further specifies above-mentioned architecture with the treatment scheme of system call write operation.At first when the application requests write operation, operating system passes to write request the processing function of Virtual File System by system call interfaces, Virtual File System is transmitted write request and is given the interlayer file system, the interlayer file system reorganizes the data content of writing disk by the data block compression/encryption back to write request again, at last new data content is submitted to bottom document system JFS (Journaling File System) as parameter and really writes issued transaction.
Being applied to compressed file system with the present invention particularly below and encrypted file system is an example, the Journaling File System based on JFS (Journal File System) is described, is how to utilize the interlayer file system to realize that file system data is encrypted and data compression.
The realization principle of encryption/compression file system is to create an interlayer file system, and the read and write request of package file system.Generally, when application program was sent written document request to file system, one-writing system calls submitted to the VFS layer with this request, and VFS realizes write operation by the function that calls the bottom document system again; If but user's request is compressed data or is encrypted, after promptly having articulated encryption/compression interlayer file system, user's write request will be intercepted and captured when the bottom document system is submitted at VFS, pass through of the content compression/encryption of encryption/compression interlayer file system earlier, and then call the real operating writing-file of function realization of bottom document system the write data buffer zone.This just requires handling function set inode_operations, file_operations, super_operations and the address_space_operations of interlayer file system will override the handling function set of the JFS correspondence that articulates under original inode.How the realization function pointer of file system call interface is pointed to that to have encryption/compression function operations collection of functions be the first step that realizes compression/encrypted file system.
Consider that inode is a structure in the internal memory, attribute i_op under it and the member a_ops of i_fop and i_mapping point to inode_operations, file_operations and the address_space_operations of file system respectively, and this property value of three is to create in the process of internal memory inode by assignment reading disk i node, therefore need to rewrite the process of creating internal memory inode, allow the i_op of inode and i_fop etc. point to the handling function of interlayer file system well.In the process of creating internal memory inode, the function that not only needs to call real bottom document system is read disk i node, creates the various attributes of internal memory inode, also requires to be redirected each operational set of inode simultaneously, be overlapping operation set function pointer, see accompanying drawing 5 explanations for details.
But the operation itself of creating inode also belongs to operational set super_operations, therefore in order to cover member's operational set a_ops of i_op and i_fop and i_mapping, should at first cover the super_operations of superblock.And this operational set is to be mounted when file system is articulated, promptly installs when read_super, so should at first rewrite the read_super function, sees accompanying drawing 4 explanations for details.
Accompanying drawing 3 is the main operational set of interlayer file system and the graph of a relation of data structure.Can learn from Fig. 3: the key data structure interlayer_fs of interlayer file system has comprised four handling function set.Wherein o_fops is object (file, catalogue and be connected) inode_operations, file_operations and the structure formed of super_operations separately of interlayer file system.And these operational set finally will be called the realization function of concrete bottom document system, so the o_caops among the interlayer_fs has preserved inode_operations separately, file_operations and the super_operations of original bottom document system object (file, catalogue and be connected).Can add the operational set o_jrops of daily record if necessary and realize the operational set o_addops of additional function, data encryption/decryption for example, data compression/decompression.
Accompanying drawing 4 is operational flowcharts that the interlayer file system is read superblock interlayer_read_super..As mentioned above, reading superblock is for when articulating file system, covers the super_operations of bottom document system.
The first step is analyzed and to be articulated parameter that file system operation imports into and the type of judging the bottom document system; Global variable interlayer_cache of initialization is an interlayer file system superblock internal storage structure, preserves the real superblock pointer and the interlayer file system operation structure interlayer_fs of bottom document system in this structure.Because the interlayer file system is not real file system, therefore to preserve the superblock of real file system, realize using for the real system call in back.
Second step, call the read_super function of real bottom document system, read the content of superblock and obtain the super_operations of bottom document system.
In the 3rd step, the super_operations of interlayer file system is installed.Concrete implementation method is the operation set attribute that at first super_operations of bottom document system is copied to the superblock of interlayer file system, judge whether to need to change certain operation of super_operations then, if certain operation change of interlayer file system original operation, just revise the function pointer of this operation, make the new handling function of its sensing.So just guaranteed the integrality of operational set.If the interlayer file system does not need the operation that changes, just use the original bottom document system operation function of acquiescence.
The 4th step, the inode_operations of installation root directory node (articulating a little), file_operations and address_space_operations make each operational set of root directory point to new handling function.
In the 5th step, function returns.
Accompanying drawing 5 is handling function interlayer_read_inode process flow diagrams of creating internal memory inode.As mentioned above, the operation of regenerative reading inode is for when creating internal memory inode, is redirected each operational set of inode.
The first step is taken out the superblock internal storage structure of interlayer file system, and the global variable interlayer_cache that just reads when read_super can obtain the superblock and the various operational set of bottom document system by it.
In second step, that calls the bottom document system reads the inode function, creates an internal memory inode structure according to disk inode in internal memory, and to the various attribute assignments of inode structure.
The 3rd step, the type (catalogue, file still link) of judgement inode.Be respectively internal memory inode inode_operations, file_operations and address_space_operations are installed.The method of fitting operation set is the same with installation super_operations.
In the 4th step, function returns.
Accompanying drawing 6 is write operation interlayer_write process flow diagrams.Be how the encapsulation of data encryption/compression is operated as can see from Figure 6.By Fig. 6, can see clearly the interlayer file system is how to play a role in the process of issued transaction.
The first step is taken out the file_opertions function pointer of bottom document system.
In second step, the supplemental characteristic buffer zone that request is transmitted to write carries out special processing.As: can utilize compression algorithm for compressed file system at this, the data of compressed buffer; Can utilize cryptographic algorithm that the data in the buffer zone are encrypted for encrypted file system.
The 3rd step, call the write function of concrete bottom document system, with the data in the buffer zone of handling real be submitted to the I/O device drives, finish disk write operation.
In the 4th step, function returns.
Equally, encapsulate the read operation of this interlayer file system if desired, concrete is the read function of writing the interlayer file system, after sense data, utilizes the data after decompression algorithm will be compressed to return to the user; After perhaps utilizing decipherment algorithm to the data decryption of reading, copy returns to the user again.
By top description as can be seen,, just can realize the function of transparent extended file system, make file system have the function of encrypt/decrypt and compression/decompression only by encapsulation to read/write operation.The application of interlayer file system also runs far deeper than these in fact, utilizes the encapsulation to the read/write operation of interlayer file system, can also accomplish being redirected read/write operation.Equally, the encapsulation that far from only is confined to read/write operation that can control, by arbitrary function among encapsulation inode_operations, file_operations and the address_space_operations, the interlayer file system can also realize more other functions.
In order to make the interlayer file system more flexible, but the interlayer file system is embodied as an installed module, needn't recompilate under the condition that connects kernel, but installed module is dynamically inserted in the operating kernel, make it to become an organic component of kernel, just can make file system increase special function; Perhaps from kernel, remove the module of having installed, thereby the cancellation file system is to the processing of particular transaction.For example, in Linux, its specific implementation realizes by calling module_init (initialization interlayer file system) and module_exit (withdrawing from the interlayer file system).In initialization interlayer file system, registration interlayer file system; And in the function that withdraws from the interlayer file system, cancel registered interlayer file system.
It should be noted last that: above embodiment is the unrestricted technical scheme of the present invention in order to explanation only, although the present invention is had been described in detail with reference to the foregoing description, those of ordinary skill in the art is to be understood that: still can make amendment or be equal to replacement the present invention, for any modification or partial replacement that does not break away from the spirit and scope of the present invention, it all should be encompassed in the middle of the claim scope of the present invention.
Claims (9)
1, a kind of method of transparent extended file systemic-function, its file system comprises Virtual File System VFS and bottom document system, it is characterized in that, between VFS layer standard calls interface and bottom document system interface, an interlayer file system (Interlayer File System) also is set, when an application program was sent the request of a file system, system call interfaces was submitted to this request the VFS layer earlier and is handled function; VFS submits to described interlayer file system by the standard calls interface with request; Undertaken after particular transaction handles by this interlayer file system, again affairs are submitted to the concrete file system of bottom; At last, realize actual data access or input and output by the bottom document system.
2, the method for transparent extended file systemic-function according to claim 1 is characterized in that, the operational set by the redirection file system realizes the processing of particular transaction, and step comprises:
Step 21 by the operation that the interlayer file system is read superblock interlayer_read_super, covers the super operation set super_operations of bottom document system;
Step 22 when creating internal memory i node, is redirected three kinds of operational set of i node;
Step 23 at the various operational set functions of interlayer file system realization i node, is finished the processing of particular transaction.
3, the method for transparent extended file systemic-function according to claim 2 is characterized in that, described step 21 further comprises:
Analysis articulates the parameter that file system operation imports into and judges the type of bottom document system; Global variable interlayer_cache of initialization is an interlayer file system superblock internal storage structure, preserves the real superblock pointer and the interlayer file system operation structure interlayer_fs of bottom document system in this structure;
That calls real bottom document system reads superblock read_super function, reads the content of this superblock and obtains the super operation super_operations of bottom document system;
The super operation super_operations of interlayer file system is installed;
The inode_operations of root directory node (articulating a little) is installed, and file_operations and address_space_operations make each operational set of root directory point to new handling function;
Function returns.
4, the method for transparent extended file systemic-function according to claim 3 is characterized in that, the super operation super_operations of described installation interlayer file system specifically comprises:
At first, the super operation super_operations of bottom document system is copied to the operation set attribute of the superblock of interlayer file system;
Then, judge whether need to change certain operation of super operation super_operations, if certain operation change of interlayer file system original operation, just revise the function pointer of this operation, make it point to new handling function; If the interlayer file system does not need to change operation, just use the original bottom document system operation function of acquiescence.
5, the method for transparent extended file systemic-function according to claim 3 is characterized in that, described step 22 further comprises:
Take out the superblock internal storage structure of interlayer file system;
That calls the bottom document system reads the inode function, creates an internal memory inode structure according to disk inode in internal memory, and gives the various attribute assignments of inode structure;
The type of judging inode belongs to catalogue, file still links, and is respectively internal memory inode i nodal operation inode_operations is installed, file operation file_operations and address space operation address_space_operations;
Function returns.
6, the method for transparent extended file systemic-function according to claim 3 is characterized in that, described step 23 further comprises:
Take out the file operation file_opertions of bottom document system or the function pointer of i nodal operation inode_operations or address space operation address_space_operations;
The respective function that needs extended function is carried out special processing.
7, according to the method for the arbitrary described transparent extended file systemic-function of claim 1-6, it is characterized in that, described interlayer file system is one can load or module that removal loads at any time, and after module was loaded, the interlayer file system was intercepted and captured the request that VFS submits to downwards; After the Unload module, then recover original operating process, the VFS layer directly will ask to submit the bottom document system to, by the various requests of bottom document system specific implementation.
8, the method for transparent extended file systemic-function according to claim 7 is characterized in that, it is to register the interlayer file system by calling initialization interlayer file system (module_init) that described module is loaded.
9, the method for transparent extended file systemic-function according to claim 8 is characterized in that, the unloading of described module is to withdraw from interlayer file system (module_exit) and cancel registered interlayer file system by calling.
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| CN100386737C (en) * | 2005-05-30 | 2008-05-07 | 杨来 | Data recovery technique based on packet structure |
| CN100407139C (en) * | 2005-03-31 | 2008-07-30 | 株式会社日立制作所 | File system and method for constructing and enhancing file system function |
| CN100504873C (en) * | 2006-01-10 | 2009-06-24 | 国际商业机器公司 | Method and system for managing an archived file system |
| CN102682129A (en) * | 2012-05-17 | 2012-09-19 | 北京像素软件科技股份有限公司 | Data reading method based on virtual file system |
| CN103020199A (en) * | 2012-12-05 | 2013-04-03 | 上海创图网络科技发展有限公司 | Virtual file system suitable for different operating system platforms and application thereof |
| CN103593424A (en) * | 2013-11-07 | 2014-02-19 | 浪潮电子信息产业股份有限公司 | Configurable big-data compression processing system integrating software and hardware |
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| CN100407139C (en) * | 2005-03-31 | 2008-07-30 | 株式会社日立制作所 | File system and method for constructing and enhancing file system function |
| CN100386737C (en) * | 2005-05-30 | 2008-05-07 | 杨来 | Data recovery technique based on packet structure |
| CN100504873C (en) * | 2006-01-10 | 2009-06-24 | 国际商业机器公司 | Method and system for managing an archived file system |
| CN102682129A (en) * | 2012-05-17 | 2012-09-19 | 北京像素软件科技股份有限公司 | Data reading method based on virtual file system |
| CN103020199A (en) * | 2012-12-05 | 2013-04-03 | 上海创图网络科技发展有限公司 | Virtual file system suitable for different operating system platforms and application thereof |
| CN103593424A (en) * | 2013-11-07 | 2014-02-19 | 浪潮电子信息产业股份有限公司 | Configurable big-data compression processing system integrating software and hardware |
| CN104573061B (en) * | 2015-01-23 | 2017-09-26 | 南开大学 | A kind of Virtual File System apparatus and method for supporting expanded function |
| CN104573061A (en) * | 2015-01-23 | 2015-04-29 | 南开大学 | Virtual file system device and method supporting expanding function |
| CN104850401A (en) * | 2015-05-07 | 2015-08-19 | 南京大学 | Method for replacing Hadoop storage module by using PVFS (Parallel Virtual File System) |
| CN104850401B (en) * | 2015-05-07 | 2018-04-24 | 南京大学 | A kind of method that Hadoop memory modules are substituted with PVFS |
| CN105205094A (en) * | 2015-08-12 | 2015-12-30 | 浪潮(北京)电子信息产业有限公司 | Multi-control share storage system |
| CN105511811A (en) * | 2015-12-07 | 2016-04-20 | 浪潮(北京)电子信息产业有限公司 | Method and system for raising throughput of file system |
| CN105511811B (en) * | 2015-12-07 | 2018-09-07 | 浪潮(北京)电子信息产业有限公司 | A kind of method and system improving file system handling capacity |
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