CN109189748A - A kind of buffer consistency processing method and nfs server - Google Patents
A kind of buffer consistency processing method and nfs server Download PDFInfo
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- CN109189748A CN109189748A CN201810948347.7A CN201810948347A CN109189748A CN 109189748 A CN109189748 A CN 109189748A CN 201810948347 A CN201810948347 A CN 201810948347A CN 109189748 A CN109189748 A CN 109189748A
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F9/00—Arrangements for program control, e.g. control units
- G06F9/06—Arrangements for program control, e.g. control units using stored programs, i.e. using an internal store of processing equipment to receive or retain programs
- G06F9/44—Arrangements for executing specific programs
- G06F9/448—Execution paradigms, e.g. implementations of programming paradigms
- G06F9/4482—Procedural
Abstract
This application discloses a kind of buffer consistency processing method and nfs servers.When nfs server starts, pass through file system interface layers calls application interface, registered callbacks function；Call back function when the metadata information for caching when file system interface layers changes, notifies the changed metadata information of nfs server；Addition readjustment processing function parses changed metadata information when call back function is called using readjustment processing function；Update the metadata information of local cache.Nfs server can be when the metadata information of the caching of file system interface layers changes in the application, timely update the metadata information of local cache, guarantee that nfs server and the metadata information of file system interface layers caching are consistent in real time, the normal operating of the normal access and multi-client of client is effectively ensured.The usage scenario for extending NFS improves the stability that NFS operates multi-client and accesses.
Description
Technical field
This application involves distributed file system fields, take more particularly to a kind of buffer consistency processing method and NFS
Business device.
Background technique
In distributed file system, generally made using NFS (Network File System, Network File System) agreement
For the entrance of client access.NFS protocol can also provide stable performance due to its versatility and easy to use, use
Scene is more.Nfs server all uses cache policy, and the business operation of client is promoted by cache metadata information
Energy.The NFS protocol cache policy that uses of default is caching effective time, i.e., according to the cache-time of metadata information whether be more than
Whether the metadata information of the caching effective time of setting, the file or catalogue that judge access are effective.If cache-time
More than caching effective time, judge that metadata information is invalid.
Using and realizing for this strategy is all fairly simple.And in distributed file system, for compatible various protocols, distribution
The interface layer of formula file system also can cache metadata information, to guarantee the performance of various protocols.But due to nfs server
The cache policy of itself is easy to produce the metadata information of nfs server caching with after under the scene of multiple client access
The situation for holding the metadata information of file system interface layers caching inconsistent, causes client access exception.
Summary of the invention
Based on the above issues, this application provides a kind of buffer consistency processing method and nfs servers, to solve NFS
The inconsistent problem of the metadata information of server and file system interface layers caching, guarantees the normal access of client.
The embodiment of the present application discloses following technical solution:
For the application in a first aspect, providing a kind of buffer consistency processing method, this method is applied to nfs server, comprising:
When the nfs server starts, pass through file system interface layers calls application interface, registered callbacks function；
The call back function when metadata information for caching when the file system interface layers changes, notifies the NFS to take
The business changed metadata information of device；
Addition readjustment processing function；
Function is handled using the readjustment, when the call back function is called, parses changed first number
It is believed that breath；
Update the metadata information of local cache.
Optionally, the metadata information of the file system interface layers caching changes, comprising:
In response to the first request from the first client modification metadata information, the file system interface layers execute institute
It states the corresponding operation of the first request and updates the file system interface layers after described first requests corresponding operation to run succeeded
The metadata information of caching includes the changed metadata information in updated metadata information.
Optionally, the method also includes:
Receive the second request that the metadata information of the file system interface layers caching is modified from NFS client；
By the calling of the file system interface layers application programming interfaces, make the file system interface layers in response to institute
It states the second request and executes the corresponding operation of second request；
After the corresponding operation of second request runs succeeded, described the from the file system interface layers is received
Two requests are corresponding to operate the message to run succeeded；
According to the message, the metadata information of local cache is updated.
Optionally, what second request corresponding operation of the reception from the file system layer ran succeeded disappears
After breath, the method also includes:
The message that the corresponding operation of second request runs succeeded is returned to the NFS client.
The application second aspect, provides a kind of nfs server, and the nfs server includes:
Function registration unit, for calling application program by file system interface layers in nfs server starting
Interface, registered callbacks function；The call back function, for becoming when the metadata information of file system interface layers caching
When change, the changed metadata information of the nfs server is notified；
Function adding unit, for adding readjustment processing function；
Processing unit, when the call back function is called, parses the hair for handling function using the readjustment
The metadata information for changing；
First updating unit, for updating the metadata information of local cache.
Optionally, the nfs server further include:
First receiving unit, for receiving the second request from NFS client modification metadata information；
Call unit makes the file system for the calling by the file system interface layers application programming interfaces
Interface layer executes the corresponding operation of second request in response to second request；
Second receiving unit is held for receiving the corresponding operation of second request from the file system interface layers
The successful message of row；
Second updating unit, for updating the metadata information of local cache according to the message.
Optionally, the nfs server, further includes:
Transmission unit, for returning to the NFS client, second request is corresponding to operate the message to run succeeded.
Compared to the prior art, the application has the advantages that
The application proposes that a kind of buffer consistency processing method and nfs server pass through file when nfs server starts
System interface layer calls application interface, registered callbacks function；The call back function, for working as the file system interface layers
When the metadata information of caching changes, the changed metadata information of the nfs server is notified；Add readjustment processing
Function handles function using the readjustment, when the call back function is called, parses the changed metadata letter
Breath；Update the metadata information of local cache.
In the application nfs server can when the metadata information of the caching of file system interface layers changes, and
The metadata information of Shi Gengxin local cache guarantees that the metadata information of nfs server and file system interface layers caching is real-time
It is consistent, the normal operating of the normal access and multi-client of client is effectively ensured.The usage scenario for extending NFS, mentions
The stability that NFS operates multi-client and accesses is risen.
Detailed description of the invention
In order to illustrate the technical solutions in the embodiments of the present application or in the prior art more clearly, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of application without any creative labor, may be used also for those of ordinary skill in the art
To obtain other drawings based on these drawings.
Fig. 1 is a kind of flow chart of buffer consistency processing method provided by the embodiments of the present application；
Fig. 2 is the flow chart of another buffer consistency processing method provided by the embodiments of the present application；
Fig. 3 is a kind of structural schematic diagram of nfs server provided by the embodiments of the present application.
Specific embodiment
Currently, NFS protocol default use cache-time expired as cache policy, however multiple client access or
Under the scene high to coherence request such as high-performance calculation, it is easy the metadata information and backend file cached by nfs server
The phenomenon that metadata information of system interface layer caching is synchronized not in time, leads to client access exception, influencing client just
Frequentation is asked and is operated.
To solve the above problems, proposing a kind of buffer consistency processing method and nfs server in the application.To make this Shen
Above objects, features, and advantages please can be more obvious and easy to understand, with reference to the accompanying drawings and detailed description to the application's
Technical solution is described in further detail.
First embodiment
Referring to Fig. 1, which is a kind of flow chart of buffer consistency processing method provided by the embodiments of the present application.
As shown in Figure 1, buffer consistency processing method provided in this embodiment, comprising:
When step 101:NFS server starts, pass through file system interface layers calls application interface, registered callbacks letter
Number.
In this step, nfs server is transmitted to rear end text to file system interface layers registered callbacks function, by function pointer
Part system interface layer stores.In the present embodiment, call back function is used for the metadata information when file system interface layers caching
When changing, the changed metadata information of the nfs server is notified.When the data letter of file system interface layers caching
When breath changes, file system interface layers can call call back function, and the metadata information of variation is notified to service to NFS
Device.
There are many reason of metadata information for causing file system interface layers to cache change.It, can as an example
To be other clients other than NFS client, such as the first client, to file system interface layers initiated modification file or
First request of the metadata information of catalogue, backend file system execute the corresponding operation of the first request in response to the first request,
After operation runs succeeded, file system interface layers update the metadata information of caching.Updated metadata information
In, it include changed metadata information, for example, the corresponding operation of the first request is in the write-in of the first address and the second address
Identical metadata information, then in updated metadata information, the metadata information of the first address is identical as the second address
Metadata information.
Step 102:NFS server addition readjustment processing function.
Since call back function is used for when the metadata information that file system interface layers cache changes, described in notice
The changed metadata information of nfs server, call back function is called to be indicated, the metadata of file system interface layers caching
Information changes.
Readjustment processing function, for parsing changed metadata information when call back function is called, so that NFS
Server can be according to the metadata information of changed metadata information real-time update local cache.
Readjustment processing function described in step 103:NFS server by utilizing parses institute when the call back function is called
State changed metadata information.
The specific implementation of this step can be with are as follows: when the call back function is called, the parameter that will be passed in call back function
It is parsed, parses transmitted metadata information, wherein including changed metadata information.
The metadata information of step 104:NFS server update local cache.
Nfs server updates the metadata information of local cache according to the changed metadata information being resolved to.
Nfs server is consistent with update mode of the file system interface layers to metadata information to the update mode of metadata information.
As an example, file system interface layers are newly written with metadata between metadata information A and metadata information C
Information B, then also in the updating, first number is written in nfs server between the metadata information A and metadata information C of local cache
It is believed that breath B.
As another example, file system interface layers write metadata information D in the first address where metadata information A
Enter, replace original metadata information A, then nfs server also in the updating, in the address of the metadata information A of local cache
Metadata information D is written, original metadata information A is replaced.
The above are the embodiment of the present application to propose that a kind of buffer consistency processing method passes through file when nfs server starts
System interface layer calls application interface, registered callbacks function；The call back function, for working as the file system interface layers
When the metadata information of caching changes, the changed metadata information of the nfs server is notified；Add readjustment processing
Function handles function using the readjustment, when the call back function is called, parses the changed metadata letter
Breath；Update the metadata information of local cache.
In the application nfs server can when the metadata information of the caching of file system interface layers changes, and
The metadata information of Shi Gengxin local cache guarantees that the metadata information of nfs server and file system interface layers caching is real-time
It is consistent
By above-mentioned steps, even if having modified file system interface using the client of other agreements other than NFS protocol
The metadata information of layer, NFS client are also able to access that and the consistent metadata of file system interface layers by nfs server
Information.To which this method avoid the metadata information lag of NFS client access, and it is distributed to influence client normal use
The case where file system, occurs.The normal operating of the normal access and multi-client of client is effectively ensured in this method.It extends
The usage scenario of NFS improves the stability that NFS operates multi-client and accesses.
Second embodiment
The metadata information of backend file system interface layer caching can also change because of the modification of NFS client.To protect
Demonstrate,prove the consistency of the metadata information of nfs server and file system interface layers caching, file system interface caused by this reason
Mouth layer metadata information variation is also required to be synchronized to nfs server.In turn, it is consistent to provide another caching for the embodiment of the present application
Property processing method.The present embodiment is described in detail with reference to the accompanying drawing.
Referring to fig. 2, which is the flow chart of another buffer consistency processing method provided by the embodiments of the present application.
As shown in Fig. 2, buffer consistency processing method provided in this embodiment, comprising:
Step 201 to 204 respectively with step 101 in previous embodiment to 104 identical, the associated descriptions of step 201 to 204
It can be found in previous embodiment, no longer repeated in the present embodiment.
Step 205:NFS server receives the metadata that the file system interface layers caching is modified from NFS client
Second request of information.
Step 206:NFS server passes through the calling of file system interface layers application programming interfaces, makes the file system
Interface layer executes the corresponding operation of second request in response to second request.
Step 207: after the corresponding operation of second request runs succeeded, nfs server, which receives, comes from the file
Second request of system interface layer is corresponding to operate the message to run succeeded.
After the corresponding operation of the second request that NFS client is sent runs succeeded, member of the file system interface layers to caching
Data information is updated.It include that changed metadata is believed because second requests in updated metadata information
Breath, such as the corresponding operation of the second request is that metadata information identical with the 4th address is written in third address, then after updating
Metadata information in, the metadata information of third address is metadata information identical with the 4th address.
The metadata information of file system interface layers caching returns to message after updating, to nfs server.NFS service
Device the second request ready to receive from file system interface layers is corresponding to operate the message to run succeeded.
Step 208:NFS server updates the metadata information of local cache according to the message.
It should be noted that NFS client is to when nfs server the second request of transmitting, nfs server has obtained needs and has repaired
The metadata information changed.For the consistency for guaranteeing nfs server with the metadata information of file system interface layers caching, NFS clothes
After the completion of business device needs to wait the metadata information of file system interface layers to update, locally it is updated.Therefore, nfs server obtains
It obtains after the message of file system interface layers, local cache can be updated according to the acquired metadata information for needing modify
Metadata information.
This step is different from the client of other agreements other than NFS protocol, the member of modification file system interface layers caching
After data information, synchronized update to nfs server is solved without calling call back function without using readjustment processing function
Analysis.
As a kind of possible implementation, in the present embodiment, nfs server, which receives, comes from the file system interface layers
Second request it is corresponding operate the message that runs succeeded after, further includes:
Nfs server returns to the message that the corresponding operation of the second request runs succeeded to NFS client.
In turn, NFS client can get the message that the corresponding operation of the second request runs succeeded from nfs server.
Nfs server and file system interface layers have updated the metadata information of caching all in accordance with the second request respectively.
It should be noted that in the present embodiment, to the execution sequence of step 202 to 204 and step 205 to 208 not into
Row limits.Step 202 can be executed before step 205 to 208 to 204, can also be executed after step 205 to 208.
The above are buffer consistency processing methods provided by the embodiments of the present application.This method is having first embodiment method
The advantages of on the basis of, can according to NFS client modify file system interface layers caching metadata information second request,
After the metadata information of file system interface layers updates, in the update of the synchronous metadata information of nfs server.In turn, this implementation
The method that example provides further ensures the consistency of the metadata information of nfs server and file system interface layers caching.Nothing
By the client of other agreements other than NFS client or NFS protocol, the metadata of file system interface layers caching is believed
After breath is modified, it can be synchronized to nfs server.
Based on the buffer consistency processing method that previous embodiment provides, present invention also provides a kind of nfs servers.Under
Face is described in detail nfs server provided by the present application in conjunction with attached drawing.
3rd embodiment
Referring to Fig. 3, which is the structural schematic diagram of nfs server provided by the embodiments of the present application.
As shown in figure 3, nfs server provided in this embodiment, comprising: function registration unit 301, function adding unit
302, processing unit 303 and the first updating unit 304.
Wherein, function registration unit 301, for being called by file system interface layers in nfs server starting
Application programming interfaces, registered callbacks function；The call back function, for the metadata letter when file system interface layers caching
When breath changes, the changed metadata information of the nfs server is notified；
Function adding unit 302, for adding readjustment processing function；
Processing unit 303, when the call back function is called, parses institute for handling function using the readjustment
State changed metadata information；
First updating unit 304, for updating the metadata information of local cache.
The above are nfs server provided by the embodiments of the present application, which can be in the slow of file system interface layers
When the metadata information deposited changes, the metadata information for the local cache that timely updates guarantees nfs server and file system
The metadata information of interface layer caching is consistent in real time.Even if the client using other agreements other than NFS protocol is modified
The metadata information of file system interface layers, NFS client are also able to access that and file system interface by nfs server
The consistent metadata information of layer.To which the nfs server avoids the metadata information lag of NFS client access, influences visitor
Rectify the case where being often used distributed file system generation in family.The nfs server be effectively ensured client it is normal access and it is more
The normal operating of client.The usage scenario for extending NFS improves the stability that NFS operates multi-client and accesses.
The metadata information of backend file system interface layer caching can also change because of the modification of NFS client.To protect
Demonstrate,prove the consistency of the metadata information of nfs server and file system interface layers caching, file system interface caused by this reason
Mouth layer metadata information variation is also required to be synchronized to nfs server.In turn, as a kind of possible implementation, the present embodiment
In the nfs server of offer, further includes:
First receiving unit 305, call unit 306, the second receiving unit 307 and the second updating unit 308.
Wherein, the first receiving unit 305, for receiving the second request from NFS client modification metadata information；
Call unit 306 makes the file system for the calling by the file system interface layers application programming interfaces
Interface layer of uniting, which executes described second in response to second request, requests corresponding operation；
Second receiving unit 307, for receiving the corresponding behaviour of second request from the file system interface layers
Make the message to run succeeded；
Second updating unit 308, for updating the metadata information of local cache according to the message.
As a kind of possible implementation, nfs server further include:
Transmission unit 309, for the NFS client return it is described second request it is corresponding operate run succeeded disappear
Breath.
The nfs server can modify the second of the metadata information of file system interface layers caching according to NFS client
Request, after the metadata information of file system interface layers updates, local synchronization updates metadata information.In turn, the present embodiment
The nfs server of offer further ensures the consistency of the metadata information of local and file system interface layers caching.No matter
The client of other agreements other than NFS client or NFS protocol, to the metadata information of file system interface layers caching
After modifying, it can be synchronized to local.
It should be noted that all the embodiments in this specification are described in a progressive manner, each embodiment it
Between same and similar part may refer to each other, each embodiment focuses on the differences from other embodiments.
For equipment and system embodiment, since it is substantially similar to the method embodiment, so describe fairly simple,
The relevent part can refer to the partial explaination of embodiments of method.Equipment and system embodiment described above is only schematic
, wherein unit may or may not be physically separated as illustrated by the separation member, as unit prompt
Component may or may not be physical unit, it can and it is in one place, or may be distributed over multiple networks
On unit.Some or all of the modules therein can be selected to achieve the purpose of the solution of this embodiment according to the actual needs.
Those of ordinary skill in the art can understand and implement without creative efforts.
The above, only a kind of specific embodiment of the application, but the protection scope of the application is not limited thereto,
Within the technical scope of the present application, any changes or substitutions that can be easily thought of by anyone skilled in the art,
Should all it cover within the scope of protection of this application.Therefore, the protection scope of the application should be with scope of protection of the claims
Subject to.
Claims (7)
1. a kind of buffer consistency processing method, which is characterized in that the method is applied to nfs server, comprising:
When the nfs server starts, pass through file system interface layers calls application interface, registered callbacks function；It is described
Call back function notifies the nfs server when metadata information for caching when the file system interface layers changes
Changed metadata information；
Addition readjustment processing function；
Function is handled using the readjustment, when the call back function is called, parses the changed metadata letter
Breath；
Update the metadata information of local cache.
2. the method according to claim 1, wherein the metadata information hair of file system interface layers caching
Changing, comprising:
In response to the first request from the first client modification metadata information, the file system interface layers execute described the
The corresponding operation of one request after described first requests corresponding operation to run succeeded, updates the file system interface layers caching
Metadata information, include the changed metadata information in updated metadata information.
3. method according to claim 1 or 2, which is characterized in that the method also includes:
Receive the second request that the metadata information of the file system interface layers caching is modified from NFS client；
By the calling of the file system interface layers application programming interfaces, make the file system interface layers in response to described
Two requests execute the corresponding operation of second request；
After the corresponding operation of second request runs succeeded, receives described second from the file system interface layers and ask
Seek the corresponding message for operating and running succeeded；
According to the message, the metadata information of local cache is updated.
4. according to the method described in claim 3, it is characterized in that, described second received from the file system layer
After requesting the corresponding message for operating and running succeeded, the method also includes:
The message that the corresponding operation of second request runs succeeded is returned to the NFS client.
5. a kind of nfs server, which is characterized in that the nfs server includes:
Function registration unit, for calling application program to connect by file system interface layers in nfs server starting
Mouthful, registered callbacks function；The call back function, for changing when the metadata information of file system interface layers caching
When, notify the changed metadata information of the nfs server；
Function adding unit, for adding readjustment processing function；
Processing unit, when the call back function is called, parses described become for handling function using the readjustment
The metadata information of change；
First updating unit, for updating the metadata information of local cache.
6. nfs server according to claim 5, which is characterized in that further include:
First receiving unit, for receiving the second request from NFS client modification metadata information；
Call unit makes the file system interface for the calling by the file system interface layers application programming interfaces
Layer executes the corresponding operation of second request in response to second request；
Second receiving unit, for receive the second request corresponding operation execution from the file system interface layers at
The message of function；
Second updating unit, for updating the metadata information of local cache according to the message.
7. nfs server according to claim 6, which is characterized in that further include:
Transmission unit, for returning to the NFS client, second request is corresponding to operate the message to run succeeded.
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