CN103078926B - The file access method of distributed memory system and device and system - Google Patents

Abstract

Embodiments of the present invention provide a file access method, device and system for a distributed storage system. The file access method of the distributed storage system of the present invention includes: receiving a file access request initiated by a user; according to the file access request, querying the user's access authority in the flow control entry corresponding to the file; according to the query access permissions to perform access operations on the file. The embodiment of the present invention solves the problem that some users monopolize resources in a distributed system due to insufficient control granularity of the flow control technology, resulting in low utilization rate and throughput of the distributed system.

Description

File access method, device and system of distributed storage system

technical field

Embodiments of the present invention relate to communication technologies, and in particular to a file access method, device and system for a distributed storage system.

Background technique

With the rapid development of computer network and information technology, the global information storage capacity has increased rapidly, and network storage technology is also developing continuously, which makes distributed storage widely used, network scale continues to expand, and more and more nodes are accessed. With the increase of bandwidth, the number of users is also increasing rapidly, but the increase of access users will inevitably increase the access delay of the system, which will have a bad impact on the user's use effect, which makes flow control technology an important factor in ensuring system availability. Under the circumstances, it is a technical trend to serve as many users as possible.

In the existing flow control technology, through real-time monitoring of external access in the system and the physical resource usage of each storage node in the system, the bandwidth resources of the storage nodes are automatically adjusted to limit some external requests, but the existing flow control technology Some external requests can only be limited by controlling the use of resources such as the network and hardware in the system, so that some users often monopolize resources, and the utilization rate and throughput of the distributed system are low.

Contents of the invention

Embodiments of the present invention provide a file access method, device and system of a distributed storage system, so as to improve the utilization rate and throughput of the distributed storage system.

The first aspect of the embodiments of the present invention provides a method for accessing files in a distributed storage system, including:

Receive file access requests initiated by users;

According to the file access request, query the user's access authority in the flow control entry corresponding to the file;

Execute the file access operation according to the queried access authority.

With reference to the first aspect, in a first possible implementation manner of the first aspect, the querying the user's access permission in the flow control entry corresponding to the file according to the file access request includes:

According to the user who initiates the file access request, query whether the user's access permission is allowed or prohibited in the flow control entry corresponding to the file;

According to the initiation time of the file access request, the access time of the user's access right is queried in the flow control entry.

With reference to the first possible implementation manner of the first aspect, in a second possible implementation manner of the first aspect, the method further includes:

When receiving a user access right setting instruction, set the access right and access time set for each user in the flow control entry.

With reference to the first aspect or the first possible implementation manner of the first aspect or the second possible implementation manner of the first aspect, in the third possible implementation manner of the first aspect, according to the file access request , after querying the user's access rights in the flow control entry corresponding to the file, it also includes:

According to the file access request, identify in the flow control entry corresponding to the file that the file access mode is an exclusive mode or a shared mode;

Then, performing the access operation of the file according to the queried access authority includes: prohibiting the user from accessing the file when it is identified that the access mode of the file is an exclusive mode; When sharing, instruct the user to access the file from another storage location.

With reference to the third possible implementation manner of the first aspect, in the fourth possible implementation manner of the first aspect, after performing the file access operation according to the queried access authority, the method further includes:

Set the access mode of the file in the flow control entry according to the type of the file access request.

With reference to the third possible implementation manner of the first aspect, in the fifth possible implementation manner of the first aspect, when it is recognized that the access mode of the file is a sharing mode, instruct the user to save Locations to access the files include:

When it is recognized that the access mode of the file is a sharing mode, query the redirected storage location of the file in the flow control entry;

Execute the user's access operation on the file from the redirected storage location.

With reference to the fifth possible implementation manner of the first aspect, in the sixth possible implementation manner of the first aspect, the method further includes:

Determine other storage locations according to the distribution information of files on other storage nodes;

Select the redirected storage location based on the load of the storage node where the other storage location is located.

With reference to the first aspect, in a seventh possible implementation manner of the first aspect, the method further includes:

The aging time of the flow control entry is monitored, and when the aging time is reached, the flow control entry is deleted.

A second aspect of the present invention provides a file access device for a distributed storage system, including:

A receiving module, configured to receive a file access request initiated by a user;

A query module, configured to query the user's access rights in the flow control entry corresponding to the file according to the file access request;

A processing module, configured to perform an access operation on the file according to the queried access authority.

With reference to the second aspect, in a first possible implementation manner of the second aspect, the query module includes:

A permission query unit, configured to query whether the user's access permission is allowed or prohibited in the flow control entry corresponding to the file according to the user who initiated the file access request;

A time query unit, configured to query the access time of the user's access authority in the flow control entry according to the initiation time of the file access request.

With reference to the first possible implementation manner of the second aspect, in a second possible implementation manner of the second aspect, the device further includes:

A setting module, configured to set the access authority and access time set for each user in the flow control entry when receiving the user access authority setting instruction.

In combination with the second aspect or the first possible implementation manner of the second aspect or the second possible implementation manner of the second aspect, in a third possible implementation manner of the second aspect, the device further includes:

The pattern recognition module is configured to, after querying the user's access authority in the flow control table entry corresponding to the file according to the file access request, to search the flow control table corresponding to the file according to the file access request. The access mode of the file identified in the item is exclusive or shared;

Then the processing module includes:

an exclusive prohibition unit, configured to prohibit the user from accessing the file when it is identified that the file access mode is exclusive;

A sharing instruction unit, configured to instruct the user to access the file from another storage location when it is identified that the file access mode is sharing.

With reference to the third possible implementation manner of the second aspect, in the fourth possible implementation manner of the second aspect, the device further includes: a mode setting module, configured to perform the After the file access operation, according to the type of the file access request, the access mode of the file in the flow control entry is set.

With reference to the fourth possible implementation manner of the second aspect, in a fifth possible implementation manner of the second aspect, the sharing indication unit includes:

A location query subunit, configured to query the redirected storage location of the file in the flow control entry when it is recognized that the file's access mode is shared;

The redirecting subunit is configured to perform the user's access operation on the file from the redirected storage location.

With reference to the fifth possible implementation manner of the second aspect, in a sixth possible implementation manner of the second aspect, the device further includes:

A location determining module, configured to determine other storage locations according to distribution information of files in other storage nodes;

A location selection module, configured to select a redirected storage location according to the load condition of the storage node where the other storage locations are located.

With reference to the second aspect, in a seventh possible implementation manner of the second aspect, the device further includes:

The monitoring module is configured to monitor the aging time of the flow control entry, and delete the flow control entry when the aging time is reached.

A third aspect of the present invention provides a distributed storage system, including at least two storage nodes, each of which includes the distributed storage system described in any one of the seventh possible implementation manners from the second aspect to the second aspect. A file access device for storage systems.

In the solution provided in this embodiment, through the flow control entry corresponding to the file, whether the user has the right to access the file is controlled at the granularity of the user. Through the limitation of the file flow control, the control granularity of the node flow in the distributed network is Refinement to the user who initiates the access request solves the problem in the prior art that due to the large flow control granularity, some users monopolize resources and the utilization rate of the distributed system is low.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description These are some embodiments of the present invention. For those skilled in the art, other drawings can also be obtained according to these drawings without any creative effort.

FIG. 1A is a schematic flowchart of Embodiment 1 of the file access method of the distributed storage system provided by the present invention;

FIG. 1B is a schematic diagram of a distributed storage system applicable to an embodiment of the present invention;

FIG. 2 is a schematic flowchart of Embodiment 4 of the file access method of the distributed storage system provided by the present invention;

3 is a schematic structural diagram of Embodiment 7 of the file access device of the distributed storage system provided by the present invention;

FIG. 4 is a schematic structural diagram of Embodiment 8 of the file access device of the distributed storage system provided by the present invention;

FIG. 5 is a schematic structural diagram of Embodiment 9 of the file access device of the distributed storage system provided by the present invention.

detailed description

In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments It is a part of embodiments of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

FIG. 1A is a schematic flowchart of Embodiment 1 of a file access method in a distributed storage system provided by the present invention. FIG. 1B is a schematic diagram of the architecture of a distributed storage system applicable to the embodiment of the present invention. In the distributed storage system, at least two storage nodes are included, each file can be stored on one or more storage nodes, and a file can be stored separately. Backups can also be stored in multiple storage nodes. Each storage node can learn the distribution location of files in the entire distributed storage system.

The method in this embodiment is executed by a file access device of a distributed storage system, and the device may be integrated in a storage node. The method of the present embodiment comprises the steps:

S101: Receive a file access request initiated by a user.

S102: According to the file access request, query the user's access permission in the flow control entry corresponding to the file.

Specifically, the user sends a file access request to the storage node of the distributed system, and the storage node receives the file access request initiated by the user, and according to the request, inquires whether the user's has permission to access the file.

S103: Execute the file access operation according to the queried access authority.

Specifically, when the above-mentioned storage node inquires that the user has the permission to access the file, it executes the relevant access operation corresponding to the file; if the storage node inquires that the user does not have the permission to access the file, it can return a The result is given to the user, and the user is informed that the files on the storage node are prohibited from being accessed by the user.

In the method provided in this embodiment, according to the file access request initiated by the user, query whether the user has the permission to access the file in the accessed file flow control entry, and according to the specific content of the queried file access permission, Execute corresponding file operations, and control whether external users have access to files on the node through the flow control entries corresponding to the files. Through this file flow control restriction, the control granularity of node traffic in the distributed network is fine-grained. The user who initiates the access request solves the problem in the prior art that certain users monopolize resources and the utilization rate of the distributed system is low due to the large flow control granularity.

In Embodiment 2 of the present invention, on the basis of the above-mentioned embodiment shown in FIG. 1 , according to the file access request, it is preferable to query the user's access authority in the flow control entry corresponding to the file. It is: according to the user who initiates the above file access request, query the user's access permission in the flow control table item corresponding to the file to allow access or prohibit access; and according to the initiation time of the file access request, in the flow control table item Query the access time of the user's access rights in .

Specifically, after the storage node of the distributed system receives the file access request initiated by the user, according to the user who initiated the access request, query whether the user has access rights in the flow control entry corresponding to the file, and further Content that identifies access rights, which can be, for example, allow access or deny access. The access time of the access right may also be included in the flow control entry.

There are many ways to express the access rights and access time. For example, the flow control entry corresponding to the file contains user ID, prohibition bit and time information. The user ID is used to represent the user, and the prohibition bit indicates permission Or prohibit (Deny) from accessing the file, and the time information in the flow control entry is used to indicate that the user corresponding to the above user identifier allows or prohibits access to the file within the time specified by the time information. The time information can be in various forms, for example, specifying the start execution time of the access right, or specifying the start execution time period, etc.

In the method provided in this embodiment, according to the file access request initiated by the user, in the accessed file flow control entry, by querying the user ID, time information and the value of the prohibition bit in the flow control entry, the file access request initiated by the user is determined. Whether the user of the file access request has the right to access the file, through this file flow control restriction, the control granularity of the node flow in the distributed network is refined to the user who initiates the access request, which solves the problem of flow control in the prior art. Large granularity causes certain users to monopolize resources and the utilization rate of distributed systems is low.

In Embodiment 3 of the present invention, on the basis of Embodiment 1 and Embodiment 2 above, according to the file access request, it is preferable to query the user's access authority in the flow control entry corresponding to the file, It may also be: when a user access right setting instruction is received, set the access right and access time set for each user in the flow control entry.

Specifically, the user's access authority and access time can be set at any time through the user access authority setting instruction. Usually a distributed storage system is set up as needed. It can be set for a specific user, or it can be set for a group of users, or it can be set for all users who meet a certain condition.

For example, the administrator may send a user access permission setting instruction to the storage node, and when the storage node receives the user access permission setting instruction sent by the administrator, set the access permission in the flow control entry for each user accessing the file of the storage node And access time, by setting the access rights and access time in the flow control entry, the flow control is performed on the external users who initiate access to the file. If when the administrator sends the user access permission setting instruction to the storage node, the storage node already has a user requesting to access the file, then the storage node directly performs the operation of allowing the user to access the file and directly opens the file; if the administrator After sending the user access permission setting instruction to the storage node, the file flow control entry of the storage node has been set, and the user sends a file access request to the storage node, when the storage node receives the file access request initiated by the external user When requesting, you need to query the file flow control entry after this setting, and judge the access authority and access time of the user who currently requests to access the file through the user ID, prohibition bit, and time information in the file flow control entry.

The setting of user access rights in the traffic control table items can not only be set manually, but also can be set automatically by the storage system according to the set configuration policy. For example, the storage node records file access history information, and for users who often exclusively access a file, set their access permissions to prohibit access. The present invention does not limit the configuration strategy.

In the method provided in this embodiment, by sending a user access permission setting instruction to the storage node, after receiving the instruction, the storage node sets the access permission and access time of each user in the flow control entry according to the instruction, and initiates an external file access request The user performs flow control, that is, when the external user accesses the storage node, he needs to query the flow control entry to know whether he currently has the permission to access the file of the storage node. Through this file flow control restriction, the distributed The control granularity of node traffic in the network is refined to the user who initiates the access request, which solves the problem in the prior art that certain users monopolize resources and the utilization rate of the distributed system is low due to the large flow control granularity.

FIG. 2 is a schematic flowchart of Embodiment 4 of the file access method of the distributed storage system provided by the present invention. The method is executed by a file access device of a distributed storage system, and the device can be integrated in a storage node. The method of the present embodiment comprises the steps:

S201: Receive a file access request initiated by a user.

S202: According to the file access request, query the user's access permission in the flow control entry corresponding to the file to allow access or prohibit access, if access is prohibited, end the access request, and if access is allowed, continue to execute next steps. Alternatively, it is also possible not to indicate that the access permission is prohibited or permitted, but to determine whether it is accessible according to the access mode of the subsequent file.

S203: According to the file access request, identify the access mode of the file in the flow control entry corresponding to the file as the exclusive mode or the sharing mode; if the access mode of the file is identified as the exclusive mode, perform step 204; If the access mode of the file is the sharing mode, step 205 is performed.

S204: Prohibit the user from accessing the file, and end the access request.

S205: Instruct the user to access the file from another storage location.

The specific instruction method may return a notification to the user, informing him that he can send an access request to access from another location, and may further inform the user of the storage location of other copies of the file. Alternatively, this access request can be redirected directly to another storage location.

Specifically, according to the current file access request, the storage node finds that the user who currently initiates the file access request is allowed to access the file, then the storage node identifies the file in the flow control entry corresponding to the file according to the file access request. The access mode of the file is exclusive or shared. Among them, the exclusive mode is to allow only one user to access the file at a time, and the shared mode is to allow multiple users to access multiple copies of the file at the same time. For example, the operation of writing a file is generally an exclusive mode, and the operation of reading a file is generally a shared mode. Of course, other factors may also determine which way the file is accessed.

In this embodiment, the user's file access is further finely controlled based on the file access mode. During the access process, after performing the file access operation according to the queried access authority, it may also include:

S206: Set the access mode of the file in the flow control entry according to the type of the file access request.

For example, when the file access request is a read request, the access mode of the file in the flow control entry is set as a shared mode, and when the file access request is a write request, the access mode set in the flow control entry is an exclusive mode. Files set as exclusive mode cannot be accessed by other users until the user's access is over. After the user's access is over, the access mode can be changed to shared mode.

Of course, the access mode may also be configured in other ways, for example, configured by the administrator through instructions. The present invention is not limited to this.

S207: Monitor the aging time of the flow control entry, and delete the flow control entry when the aging time is reached.

Further, when performing the above operations, the storage node will monitor the aging time of the file flow control entry in real time, and when the flow control information in the flow control entry reaches the aging time, the current flow control entry will be deleted and the node will be cancelled. Flow control over files.

The method of this embodiment also sets the file access mode according to the type of user access file request, and when the file access mode is a sharing mode, instructs the next user who accesses the current storage node to access the file from other storage locations of the file, and the user The access requests are shared to other storage nodes in a network load sharing manner, which improves the response time of users and effectively improves the utilization rate of the distributed system.

Further, in Embodiment 5 of the present invention, on the basis of Embodiment 4 above, instructing the user to access the file from other storage locations may preferably be: when it is recognized that the access mode of the file is sharing, Query the redirected storage location of the file in the above flow control entry; execute the user's access operation to the file from the redirected storage location.

Specifically, when the storage node recognizes that the access mode of the file is the sharing mode, it queries the redirected storage location of the file in the file flow control entry. The file flow control entry also includes the location information of the current file stored on other nodes, then the storage node will repeat the user's request to access the file by querying other storage locations of the currently accessed file in the file flow control entry. to another storage location for the file. More specifically, after the storage node redirects the user's request to access the file to other storage locations of the file, the file is accessed from other storage locations of the file.

In Embodiment 6 of the present invention, on the basis of Embodiment 4 and Embodiment 5 above, it is preferable to instruct the user to access the file from other storage locations. storage location; select a redirected storage location according to the load condition of the storage node where other storage locations are located; perform the user's access operation on the file from the above redirected storage location.

Specifically, when the storage node recognizes that the access mode of the file is the sharing mode, it queries the redirected storage location of the file in the above-mentioned file flow control entry, and further, the file flow control entry also includes the current The location information of the file stored in other nodes. When the file of the storage node is created, the other storage location of the file is predicted by the current storage node. Directed storage location, that is, according to the access situation of the storage node user where the other storage location of the file is located, it is decided to direct the access request of the current user of the current storage node to a node with a lighter load file storage, so that the redirected node Execute the user's access operation on the file.

In the above technical solution, since the storage node can know the distribution information of the file, it can select a location for the user to obtain the file from multiple storage locations, and directly redirect the access request to the storage node of the storage location for the user to Access without re-initiating access requests by users, reducing the occupation of information interaction resources.

If the current storage node directs the current user's access request to a certain storage node of the file storage with a lighter load, and then executes the user's access operation on the file on the redirected storage node, it can be the same as the aforementioned execution process , and perform flow control on the redirected storage node according to the flow control entry of the file.

Specifically: the redirected storage node receives the file access request initiated by the user, and according to the file access request, queries the user's access permission in the flow control entry corresponding to the file, if the file flow of the redirected storage node If there is no flow control information of the user in the control table item, the redirected storage node directly opens the file accessed by the user so that the user can perform the corresponding operation, and then records the flow control information of the user to the In the flow control entry, so that the redirected storage node performs flow control on the next user who accesses the node; if the file flow control entry of the redirected storage node contains the flow control information of the user, the redirect The storage node will recognize that the file access mode of the currently accessed file is exclusive or shared. If the access mode of the file is identified as the exclusive mode, the redirected storage node will still return the result of prohibiting access to the current file to the user; if If the access mode of the file is identified as shared mode, the redirected storage node will redirect the user's request to access the file to another file storage node in the same way as the previous storage node. Further, when executing During the above operations, the storage node will monitor the aging time of the file flow control entry in real time. When the flow control information in the flow control entry reaches the aging time, the current flow control entry will be deleted, and the node’s flow control on the file will be canceled. . For a specific implementation manner, refer to the second embodiment above.

In the method of this embodiment, when the file access mode is the sharing mode, instruct the next user who accesses the current storage node to access the file from other storage locations of the file, and share the user's access request to the network load sharing on other storage nodes. This method improves the user's response time and effectively improves the utilization rate of the distributed system.

Those of ordinary skill in the art can understand that all or part of the steps for implementing the above method embodiments can be completed by program instructions and related hardware. The aforementioned program can be stored in a computer-readable storage medium. When the program is executed, it executes the steps including the above-mentioned method embodiments; and the aforementioned storage medium includes: ROM, RAM, magnetic disk or optical disk and other various media that can store program codes.

FIG. 3 is a schematic structural diagram of Embodiment 7 of the file access device of the distributed storage system provided by the present invention. The device includes: a receiving module 31, a query module 32, and a processing module 33, wherein the receiving module 31 is used to receive user-initiated File access request; query module 32, for querying the user's access authority in the flow control entry corresponding to the file according to the file access request; processing module 33, for executing the file according to the queried access authority access operations.

The file access device in this embodiment can execute the method embodiment shown in FIG. 1 , and its implementation principles and technical effects are similar, and will not be repeated here.

FIG. 4 is a schematic structural diagram of Embodiment 8 of a file access device in a distributed storage system provided by the present invention. On the basis of the embodiment shown in FIG. 3 , the query module 32 includes: a permission query unit 320 for The user of the file access request queries the user's access authority in the flow control table item corresponding to the file to allow access or prohibit access; the time query unit 321 is used to, according to the initiation time of the file access request, in the flow Query the access time of the user's access rights in the control table item. Then, on the basis of the embodiment shown in FIG. 3 , the device further includes: a setting module 34 configured to set the access rights and access time set for each user in the flow control entry when a user access right setting instruction is received. .

The file access device in this embodiment can execute method embodiment 2 and method embodiment 3, and their implementation principles and technical effects are similar, and will not be repeated here.

Further, on the basis of the above-mentioned embodiment shown in FIG. 4 , the above-mentioned processing module may further include an exclusive prohibition unit 330 and a sharing instruction unit 331, wherein the exclusive prohibition unit 330 is configured to recognize that the access mode of the file is In the exclusive mode, the user is prohibited from accessing the file; the sharing instruction unit 331 is configured to instruct the user to access the file from other storage locations when it is recognized that the file access mode is a sharing mode. Then, on the basis of the above-mentioned embodiment shown in FIG. 4 , the device may also include a pattern recognition module 35 for querying the user's access information in the flow control entry corresponding to the file according to the file access request. After authorization, according to the file access request, identify the file access mode in the flow control entry corresponding to the file as the exclusive mode or the shared mode.

The file access device in this embodiment can execute method embodiment 2 and method embodiment 3, and their implementation principles and technical effects are similar, and will not be repeated here.

Fig. 5 is a schematic structural diagram of Embodiment 9 of the file access device of the distributed storage system provided by the present invention. On the basis of the embodiments shown in Fig. 3 and Fig. 4, the above-mentioned sharing instruction unit may further include: a location query subunit 401 and The redirection subunit 402, wherein the location query subunit 401 is configured to query the redirected storage location of the file in the flow control entry when it is recognized that the access mode of the file is a shared mode; The subunit 402 is configured to execute the user's access operation to the file from the redirected storage location, and the above-mentioned device may further include a mode setting module, configured to execute the file access according to the queried access authority After the operation, according to the type of the file access request, the access mode of the file in the flow control entry is set.

The file access device in this embodiment can execute method embodiment 4 to method embodiment 6, and their implementation principles and technical effects are similar, and will not be repeated here.

Further, on the basis of the above-mentioned embodiment shown in FIG. 5 , the device may further include: a location determination module and a location selection module, wherein the location determination module is used to determine other storage locations according to the distribution information of files in other storage nodes ; A location selection module, configured to select a redirected storage location according to the load condition of the storage node where the other storage locations are located. It may also include a monitoring module, configured to monitor the aging time of the flow control entry, and delete the flow control entry when the aging time is reached.

The file access device in this embodiment can execute method embodiment 4 to method embodiment 6, and their implementation principles and technical effects are similar, and will not be repeated here.

In the embodiment of the distributed storage system provided by the present invention, the distributed storage system includes at least two storage nodes, and each storage node includes the file access device of the distributed system shown in the above embodiment, specific implementation methods and technical effects I won't repeat them here.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present invention, rather than limiting them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: It is still possible to modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the technical solutions of the various embodiments of the present invention. scope.

Claims (13)

1. A file access method of a distributed storage system, comprising: Receive file access requests initiated by users; According to the file access request, query the user's access authority in the flow control entry corresponding to the file, wherein, when receiving the user access authority setting instruction, set the flow control entry for each Access rights and access time set by users; Execute the access operation of the file according to the queried access authority; Wherein, the querying the user's access authority in the flow control entry corresponding to the file according to the file access request includes: According to the user who initiates the file access request, query whether the user's access permission is allowed or prohibited in the flow control entry corresponding to the file; According to the initiation time of the file access request, the access time of the user's access right is queried in the flow control entry. 2. The file access method of the distributed storage system according to claim 1, characterized in that, after querying the user's access authority in the flow control entry corresponding to the file according to the file access request, Also includes: According to the file access request, identify in the flow control entry corresponding to the file that the file access mode is an exclusive mode or a shared mode; Then, performing the access operation of the file according to the queried access authority includes: prohibiting the user from accessing the file when it is identified that the access mode of the file is an exclusive mode; When sharing, instruct the user to access the file from another storage location. 3. The file access method of the distributed storage system according to claim 2, further comprising: Set the access mode of the file in the flow control entry according to the type of the file access request. 4. The file access method of the distributed storage system according to claim 2, wherein when it is recognized that the access mode of the file is a sharing mode, instruct the user to access the file from other storage locations include: When it is recognized that the access mode of the file is a sharing mode, query the redirected storage location of the file in the flow control entry; Execute the user's access operation on the file from the redirected storage location. 5. The file access method of the distributed storage system according to claim 4, further comprising: Determine other storage locations according to the distribution information of files on other storage nodes; Select the redirected storage location based on the load of the storage node where the other storage location is located. 6. The file access method of the distributed storage system according to claim 1, further comprising: The aging time of the flow control entry is monitored, and when the aging time is reached, the flow control entry is deleted. 7. A file access device for a distributed storage system, comprising: A receiving module, configured to receive a file access request initiated by a user; A query module, configured to query the user's access rights in the flow control entry corresponding to the file according to the file access request; A processing module, configured to perform an access operation on the file according to the queried access authority; A setting module, configured to set the access rights and access time set for each user in the flow control entry when the user access rights setting instruction is received; Wherein, the query module includes: A permission query unit, configured to query whether the user's access permission is allowed or prohibited in the flow control entry corresponding to the file according to the user who initiated the file access request; A time query unit, configured to query the access time of the user's access authority in the flow control entry according to the initiation time of the file access request. 8. The file access device of the distributed storage system according to claim 7, further comprising: A pattern recognition module, configured to, after querying the user's access authority in the flow control entry corresponding to the file according to the file access request, search the flow control entry corresponding to the file according to the file access request identifying the access mode of the file as exclusive or shared; Then the processing module includes: an exclusive prohibition unit, configured to prohibit the user from accessing the file when it is identified that the file access mode is exclusive; A sharing instruction unit, configured to instruct the user to access the file from another storage location when it is identified that the file access mode is sharing. 9. The file access device of the distributed storage system according to claim 8, further comprising: The mode setting module is configured to set the access mode of the file in the flow control entry according to the type of the file access request after performing the file access operation according to the queried access authority. 10. The file access device of the distributed storage system according to claim 8, wherein the sharing instruction unit comprises: A location query subunit, configured to query the redirected storage location of the file in the flow control entry when it is recognized that the file's access mode is shared; The redirecting subunit is configured to perform the user's access operation on the file from the redirected storage location. 11. The file access device of the distributed storage system according to claim 10, further comprising: A location determining module, configured to determine other storage locations according to distribution information of files in other storage nodes; A location selection module, configured to select a redirected storage location according to the load condition of the storage node where the other storage locations are located. 12. The file access device of the distributed storage system according to claim 7, further comprising: The monitoring module is configured to monitor the aging time of the flow control entry, and delete the flow control entry when the aging time is reached. 13. A distributed storage system comprising at least two storage nodes, wherein each storage node comprises the file access device of the distributed storage system according to any one of claims 7-12.