CN103729265B - A kind of guard method storing data and device - Google Patents

Abstract

The invention discloses a method and device for protecting stored data, belonging to the field of network connection storage. The method includes: receiving an attribute setting instruction, the attribute setting instruction requests to set the file snapshot level attribute of the file in the file system; setting the file snapshot level attribute of the file according to the attribute setting instruction; receiving the snapshot creation instruction, the The file snapshot level attribute parameter of the file to be protected is carried in the snapshot creation instruction; according to the snapshot creation instruction, a ROW read-only snapshot using redirection-on-write ROW technology is created for the file system, and the read-only snapshot of the ROW read-only snapshot is The snapshot level attribute is set according to the file snapshot level attribute parameter. The present invention sets the snapshot level attribute of the file, and specifies the snapshot level of the file to be protected by the read-only snapshot when creating a read-only snapshot for the system file, and decides which files in the file system to create snapshots for according to the application scenario, and controls the snapshot reduce the space used by read-only snapshots in the file system.

Description

Method and device for protecting stored data

technical field

The invention relates to the field of network connection storage, in particular to a method and device for protecting stored data.

Background technique

In the field of NAS (Network Attached Storage, network-attached storage), creating ROW read-only snapshots using ROW (Redirect-on-write) technology for FS (File System, file system) as a whole is the key to realize storage data protection. mainstream technology. The ROW read-only snapshot of FS directly protects the pre-write data blocks of FS, that is, the ROW read-only snapshot will occupy the available space allocated to FS. At present, the technology of creating ROW read-only snapshots for FS is aimed at the whole FS. When the FS is frequently modified, the ROW read-only snapshots will occupy a large amount of space in the FS. For example, in an FS with a total available space of 100MB, write a 17.94MB file 1, create a ROW read-only snapshot, and then overwrite and write the previous file 1, repeat this 4 times, the accumulated exclusive space of the ROW read-only snapshot will reach 53.89 MB, while the available space of the original FS drops to 28.1MB. When writing a 37MB file to the FS again, there will be an error that the FS space is insufficient and cannot be written. Therefore, a method for protecting stored data is needed to solve the defect that the ROW read-only snapshot occupies too much space in the source file system.

The existing technology proposes several protection methods for storing data that reduce the space occupied by read-only snapshots: method 1, configure FS ROW read-only snapshot reservation, but the ROW read-only snapshot space can exceed this reservation; method 2, configure FS automatic Capacity expansion; Method 3: Configure FS to automatically delete ROW read-only snapshots.

There are at least the following problems in the prior art:

ROW read-only snapshots occupy a large amount of FS available space, resulting in FS unavailability, directly affecting the important business of FS on the critical path; measures for the above problems cannot fundamentally solve the problem of ROW read-only snapshots occupying a large amount of FS available space.

Contents of the invention

The invention provides a method and device for protecting stored data, and the technical solution is as follows.

In a first aspect, a method for protecting stored data is provided, the method comprising: receiving an attribute setting instruction, the attribute setting instruction requesting setting of a file snapshot level attribute of a file in a file system; setting the file's snapshot level attribute according to the attribute setting instruction File snapshot level attribute; receive a snapshot creation instruction, the snapshot creation instruction carries the file snapshot level attribute parameter of the file to be protected; create a ROW read-only snapshot for the file system according to the snapshot creation instruction, and the ROW read-only The read-only snapshot level attribute of the snapshot is set according to the file snapshot level attribute parameter; match, and when matching, perform pre-write protection on the specified file according to the created ROW read-only snapshot.

With reference to the first aspect, in a first possible implementation manner of the first aspect, creating a read-only snapshot for the file system according to the snapshot creation instruction includes: creating the ROW read-only snapshot; set the read-only snapshot level attribute of the ROW read-only snapshot according to the file snapshot level attribute; set the system snapshot level attribute of the file system according to the read-only snapshot level attribute.

With reference to the first aspect or the first possible implementation of the first aspect, in the second possible implementation of the first aspect, the system snapshot level attribute includes a set of snapshot level-logical time point pairs, where the The snapshot level represents the snapshot level of the file protected by the ROW read-only snapshot, and the logical time point represents the logical time point at which the ROW read-only snapshot is created; the read-only snapshot level attribute includes a snapshot level-logical time point pair , wherein the snapshot level represents the snapshot level of the file to be protected, and the logical time point represents the logical time point for creating the ROW read-only snapshot.

With reference to the first aspect, in a third possible implementation manner of the first aspect, the snapshot creation instruction also carries a snapshot name; after creating a read-only snapshot for the file system according to the snapshot creation instruction, further includes : Name the ROW read-only snapshot according to the snapshot name.

With reference to the second possible implementation of the first aspect, in a fourth possible implementation of the first aspect, after creating a read-only snapshot for the file system according to the snapshot creation instruction, further includes: receiving A request to access the ROW read-only snapshot; output a file whose snapshot level attribute value is equal to the snapshot level value of the read-only snapshot level attribute of the ROW read-only snapshot.

With reference to the second possible implementation of the first aspect, in the fifth possible implementation of the first aspect, when the specified file is modified, it is determined whether the file snapshot level attribute of the specified file is consistent with the created Whether the read-only snapshot level attribute of the ROW read-only snapshot matches, and when matching, carry out pre-write protection to the specified file according to the created ROW read-only snapshot, including: receiving the modification data of the specified file; The modification data modifies the data of the specified file, and saves the new data of the specified file after modification to a new disk location; judging whether there is a read-only snapshot in the created read-only snapshot of the file system A read-only snapshot in which the value of the snapshot level of the level attribute is equal to the value of the file snapshot level attribute of the specified file; if it exists, keep the old data of the specified file before modification, and point the root of the ROW read-only snapshot to The old data of the specified file; otherwise, delete the old data of the specified file before modification.

In a second aspect, a device for protecting stored data is provided, the device comprising: a receiving unit, configured to receive an attribute setting instruction, the attribute setting instruction requesting setting of a file snapshot level attribute of a file in the file system, and for Receiving a snapshot creation instruction, the snapshot creation instruction carries a file snapshot level attribute parameter of the file to be protected; a setting unit is used to set the file snapshot level attribute of the file according to the attribute setting instruction received by the receiving unit; snapshot creation A unit, configured to create a read-only snapshot for the file system according to the snapshot creation instruction received by the receiving unit, and set the read-only snapshot level attribute of the ROW read-only snapshot according to the file snapshot level attribute parameter; the file protection unit, It is used to determine whether the file snapshot level attribute of the specified file matches the read-only snapshot level attribute of the created ROW read-only snapshot when modifying the specified file, and when matching, according to the created ROW read-only The snapshot protects the specified file before writing.

With reference to the second aspect, in a first possible implementation manner of the second aspect, the snapshot creation unit includes: a creation module configured to create the ROW read-only snapshot by sharing the root with the file system; A module configured to set the read-only snapshot level attribute of the ROW read-only snapshot according to the file snapshot level attribute after the creation module creates the ROW read-only snapshot, and set the read-only snapshot level attribute according to the read-only snapshot level attribute System snapshot level attributes for the file system described above.

With reference to the first possible implementation of the second aspect, in a second possible implementation of the second aspect, the recording module is further configured to record the system snapshot level attribute as including snapshot level-logical time A collection of point pairs, wherein the snapshot level represents the snapshot level of the file protected by the ROW read-only snapshot, and the logical time point represents the logical time point for creating the ROW read-only snapshot; the read-only snapshot level attribute Recorded as a set including snapshot level-logical time point pairs, wherein the snapshot level indicates the snapshot level of the file to be protected, and the logical time point indicates the logical time point for creating the ROW read-only snapshot.

With reference to the second aspect, in a third possible implementation manner of the second aspect, the receiving unit is further configured to receive a snapshot creation instruction carrying a snapshot name; The snapshot name carried in the snapshot creation command names the ROW read-only snapshot.

With reference to the second possible implementation manner of the second aspect, in a fourth possible implementation manner of the second aspect, the receiving unit is further configured to, after the snapshot creating unit creates the ROW read-only snapshot, Receive the request from the user to access the ROW read-only snapshot; the device also includes: an output unit, configured to output the value of the file snapshot level attribute and the read-only value of the ROW read-only snapshot according to the request received by the receiving unit Files whose snapshot-level values in the snapshot-level attribute are equal.

With reference to the second aspect, the first, the second, the third or the fourth possible implementation manner of the second aspect, in a fifth possible implementation manner of the second aspect, the receiving unit is further configured to receiving modification data of a designated file in the file system; the device further includes: a modification module, configured to modify data of the designated file according to the modification data received by the receiving unit, and modify the modified data of the designated file The new data is saved to a new disk location; the judging module is used to judge the created read-only snapshot of the file system after the modification module saves the modified new data of the specified file to the new disk location Among them, whether there is a read-only snapshot whose value of the snapshot level attribute of the read-only snapshot level attribute is equal to the value of the file snapshot level attribute of the specified file; the root module is used to determine whether the judgment module stores the read-only snapshot level attribute and When the file snapshot level attribute of the specified file matches the ROW read-only snapshot, the root of the ROW read-only snapshot points to the old data of the specified file; the deletion module is used to judge whether there is only When reading a read-only snapshot whose snapshot level attribute matches the file snapshot level attribute of the specified file, delete the old data of the specified file before modification.

The technical solution provided by the embodiment of the present invention can set the file snapshot level attribute by increasing the file snapshot level attribute of the file, different files can be set to different snapshot levels, and at the same time when creating a ROW read-only snapshot for the system file Specify the snapshot level of the files to be protected by the ROW read-only snapshot, and let the ROW read-only snapshot only protect those important files that need to be protected, which can effectively reduce the FS space occupied by the ROW read-only snapshot.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings that need to be used in the description of the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present invention. Additional drawings can also be derived from these drawings.

FIG. 1 is a flowchart of a method for protecting stored data provided by Embodiment 1 of the present invention;

FIG. 2 is a flowchart of a method for protecting stored data provided by Embodiment 2 of the present invention;

FIG. 3 is a schematic diagram of snapshot level attributes of files of fs1 in Embodiment 2 of the present invention;

FIG. 4 is a schematic diagram of creating a ROW read-only snapshot of a specified snapshot level for fs1 in Embodiment 2 of the present invention;

FIG. 5 is a schematic diagram of modifying file1 not protected by snapshots in Embodiment 2 of the present invention;

FIG. 6 is a schematic diagram of modifying file2 protected by snapshots in Embodiment 2 of the present invention;

FIG. 7 is a flowchart of a method for protecting stored data provided by Embodiment 3 of the present invention;

FIG. 8 is a schematic diagram of creating multiple read-only snapshots in Embodiment 3 of the present invention;

FIG. 9 is a schematic structural diagram of a protection device for storing data provided by Embodiment 4 of the present invention;

FIG. 10 is a schematic structural diagram of a protection device for storing data provided by Embodiment 5 of the present invention.

detailed description

The inventor of the present invention found in the research process of reducing the excessive space occupied by read-only snapshots in the FS that not all files in the FS are worth protecting with their read-only snapshots, so if the selective protection of the read-only snapshots of the FS is controlled Important files in FS can solve the problem that read-only snapshots occupy a large amount of FS free space, and then make FS services on the critical path as available as possible.

In order to control the protection object of the read-only snapshot, the present invention adds an attribute to all files (including directories) of the FS: a file snapshot level attribute, which can also be set by the user; an instruction for creating a FS read-only snapshot is added Option: file snapshot level attribute parameter, the FS read-only snapshot created will only protect the files in FS that have the file snapshot level attribute matching the file snapshot level attribute parameter, that is, the value of the file snapshot level attribute is the same as that of the file snapshot The values of the level attribute parameters are the same; add a system snapshot level attribute for FS; add a read-only snapshot level attribute for read-only snapshots.

In order to make the object, technical solution and advantages of the present invention clearer, the implementation manner of the present invention will be further described in detail below in conjunction with the accompanying drawings.

Embodiment one

This embodiment provides a method for protecting stored data, please refer to Figure 1, the method flow includes:

101. Receive an attribute setting instruction, where the attribute setting instruction requests to set a file snapshot level attribute of a file in the file system;

102. Set the file snapshot level attribute of the file according to the attribute setting instruction;

103. Receive a snapshot creation instruction, where the snapshot creation instruction carries a file snapshot level attribute parameter of the file to be protected;

104. Create a read-only snapshot for the file system according to the snapshot creation instruction, and the read-only snapshot level attribute of the ROW read-only snapshot is set according to the file snapshot level attribute parameter;

105. When modifying the specified file, judge whether the file snapshot level attribute of the specified file matches the read-only snapshot level attribute of the created ROW read-only snapshot, and when matching, according to the created ROW read-only The snapshot protects the specified file before writing.

Specifically, the pre-write protection refers to mapping or preserving the data of the specified file before modification.

Further, the creating a read-only snapshot for the file system according to the snapshot creation instruction includes:

Create the ROW read-only snapshot by sharing the root with the file system;

Set the read-only snapshot level attribute of the ROW read-only snapshot according to the file snapshot level attribute;

Setting the system snapshot level attribute of the file system according to the read-only snapshot level attribute.

Specifically, the root of a file system or read-only snapshot is a disk address through which all directories and file data in the file system or ROW read-only snapshot can be accessed; since the directories and files of the file system or read-only snapshot are all Abstracted into individual Objects (objects), all these Objects form the Objset (object set) of the file system or read-only snapshot, the Objset is organized in the form of a tree, and the tree has an ObjsetRoot (tree root) address, which can be accessed through this Objset Root All Objects to the file system/read-only snapshot, so the file system or read-only snapshot root is also called Objset Root.

Creating the ROW read-only snapshot by sharing the root with the file system refers to pointing the root of the ROW read-only snapshot to the root of the file system when creating the ROW read-only snapshot. When the ROW read-only snapshot is created, because the files in the file system have not been modified, and the ROW read-only snapshot directly protects the data before writing (that is, the data before modification) of the FS. Therefore, at this time, the root of the ROW read-only snapshot points to The root of the file system.

Further, the system snapshot level attribute and the read-only snapshot level attribute include a set of [snapshot level-logical time point] pairs, wherein the snapshot level represents the snapshot level of the file protected by the ROW read-only snapshot, logical The time point represents the logical time point for creating the ROW read-only snapshot;

The read-only snapshot level attribute includes a set of [snapshot level-logical time point] pairs, wherein the snapshot level represents the snapshot level of the file to be protected, and the logical time point represents the logical time for creating the ROW read-only snapshot point.

Further, the snapshot creation instruction also carries a snapshot name;

After creating a read-only snapshot for the file system according to the snapshot creation instruction, it further includes:

Name the ROW read-only snapshot according to the snapshot name.

Further, after creating a read-only snapshot for the file system according to the snapshot creation instruction, the method further includes:

receiving a request to access the ROW read-only snapshot;

output the file whose snapshot level attribute value is equal to the snapshot level value of the read-only snapshot level attribute of the ROW read-only snapshot.

Further, when the specified file is modified, it is judged whether the file snapshot level attribute of the specified file matches the read-only snapshot level attribute of the created ROW read-only snapshot, and when matching, according to the created ROW read-only snapshots protect the specified files before writing, including:

receiving modification data of a specified file in the file system;

Judging whether there is a read-only snapshot in which the value of the snapshot level of the read-only snapshot level attribute is equal to the value of the file snapshot level attribute of the specified file in the created read-only snapshot of the file system;

If it exists, keep the old data of the specified file before modification, and point the root of the ROW read-only snapshot to the old data of the specified file; otherwise, delete the old data of the specified file before modification.

In the protection method for stored data provided in this embodiment, by increasing the file snapshot level attribute of the file and setting the file snapshot level attribute, different files can be set to different snapshot levels, and at the same time, when creating a ROW read-only system file When taking a snapshot, specify the snapshot level of the files to be protected by the ROW read-only snapshot, so that the ROW read-only snapshot only protects those important files that need to be protected, and also allows users to participate in the control of the ROW read-only snapshot, which is determined by the user according to the application scenario Decide which files in the FS should be created as snapshots, control the space used by the snapshots as much as possible, reduce the FS space occupied by ROW read-only snapshots, make the FS on the critical path as available as possible, and improve the competitiveness of the product.

Embodiment two

This embodiment provides a method for protecting stored data, and the method is described by taking a ROW read-only snapshot as an example. Please refer to Figure 2, the method flow includes:

201. Receive an attribute setting instruction input by a user to request that the value of the file snapshot level attribute of file 2 (file2) in fs1 be set to 1.

Specifically, both files 1 (file1) and file2 in fs1 have a file snapshot level attribute: sanpLevel.

sanpLevel: The snapshot level of the file, the default is not set (none).

202. Set the value of the file snapshot level attribute of file2 to 1 according to the attribute setting instruction.

Specifically, after completing the setting of the file snapshot level attribute of file2 according to the attribute setting instruction, please refer to FIG. 3 for a schematic diagram of the snapshot level attribute of the file of fs1.

The file system fs1 has four attributes related to ROW read-only snapshots:

prevSnap (previous snapshot): points to the previous ROW read-only snapshot of FS;

nextSnap (next snapshot): Point to the next ROW read-only snapshot of FS;

snapLevels system snapshot level: Contains a [key-value] pair, that is, a set of [snapshot level-logical time point] pairs, the key is the snapshot level of the file to be protected by the read-only snapshot, and the value is the logical time point when the read-only snapshot is created. Defaults to [none] when no ROW read-only snapshot is created;

FS Root (the root of FS): points to the root of all file data in fs1.

Since the user chooses to set the value of the file snapshot level attribute of file2 to 1, sanpLevel=1 of file2 and sanpLevel=none of file1 after completing the user's attribute setting instruction in this step.

203. Receive a snapshot creation instruction input by a user to create a file named snap1 for fs1 that only protects a file whose value of sanpLevel is set to 1.

Specifically, the snapshot creation command can use the following format:

Snapshot create fs1snap1snapLevel=1

Specifically, Snapshot create: means to create a snapshot;

fs1: means to create a snapshot for the file system fs1;

snap1: indicates that the name of the snapshot is snap1;

snapLevel=1: Indicates that snapshots are only created for files whose level is set to 1 in the file system, that is, only files whose snapshot level attribute value is 1 are protected.

204. Create a ROW read-only snapshot named snap1 according to the snapshot creation instruction.

Specifically, this step creates a ROW read-only snapshot named snap1, and makes the snapshot share the root of the file system. Refer to Figure 4 for a schematic diagram of creating a ROW read-only snapshot with a specified snapshot level for fs1.

After the creation is complete, the relevant properties of fs1 and snap1 are set as follows:

The snapLevels of fs1 sets a key-value pair: "1-10", indicating that the file system fs1 created a file with a snapshot level attribute value of 1 at the logical time point of 10 (that is, a snapshot was created ROW read-only snapshot with level 1);

The snapLevels of snap1 is set with a key-value pair: "1-10", which means that the logical time point of creating the snap1 is 10, and it only protects the files whose file snapshot level attribute value is 1 before the logical time point 10.

The prevSnap of fs1 points to snapshot snap1; the nextSnap of sanp1 points to fs1;

The root of the Snap Root snapshot of sanp1 directly shares the root of the file system fs1: FS Root.

Specifically, if a request from a user to access snap1 is received at this time, files that do not match the snapLevels of sanp1 will be filtered out, and files that match the snapshot level of the ROW read-only snapshot will be output, that is, the ROW read-only snapshot will only output The value of snapLevel is the same as the value of the snapshot level key of its own snapLevels.

205. Receive modification data for modifying file1;

206. Modify the data of file1 according to the modified data, and save the modified new data of file1 to a new disk location;

207. Determine that the snapLevels of snap1 do not match the snapLevels of file1, and delete old data of file1.

Specifically, judging whether the snapLevels of snap1 matches the snapLevel of file1 mainly depends on whether the value of snapLevel is equal to the value of the key of snapLevels. In this embodiment, the snapLevel value of file1 is none, and the key value of snapLevels of snap1 is 1, and the two do not match.

Specifically, for a schematic diagram of modifying file1 that is not protected by the snapshot, please refer to FIG. 5 , where "X" in the figure indicates that data is deleted. After modifying file1, following the ROW principle, the new data of file1 is always written to the new disk location; while the old data of file1 is not protected by snap1 because file1's snapLevel=none, and will be deleted directly; at this time, the root of fs1 points to file1 The new data of and the data of file2, while the root of snap1 points to the data of file2. In this step, the old data of file1 is deleted, which will no longer occupy the available space of the file system fs1, thereby reducing the occupation of the available space of the source FS by the ROW read-only snapshot.

208. Receive modification data for modifying file2;

209. Modify the data of file2 according to the modified data, and save the modified new data of file2 to a new disk location;

210. Determine that the snapLevelsl of snap1 matches the snapLeve of file2, and keep the old data of file2.

Specifically, for a schematic diagram of modifying file2 protected by a snapshot, please refer to FIG. 6 . Following the ROW principle, the new data of file2 is always written to the new disk location; while the old data of file2 is protected by snap1 because the snapLevel=1 of file2 will not be deleted. At this point, the root of fs1 points to the new data of file1 and the new data of file2, while the root of snap1 points to the old data of file2.

Specifically, the execution subject of this embodiment may be a storage management system.

The method for protecting stored data provided by this embodiment adds a file snapshot level attribute to files in the file system, and the user sets different files to different snapshot levels by setting the file snapshot level attribute, and the user can at the same time When creating a ROW read-only snapshot for a system file, specify the snapshot level of the file to be protected. After the file is modified, it is determined based on whether there is a ROW read-only snapshot whose read-only snapshot level attribute matches the file snapshot level attribute of the modified file. Whether to perform snapshot protection on the file, if it exists, keep the old data of the file before modification, otherwise delete the old data of the file before modification, so that users can participate in the control of ROW read-only snapshots, and the user decides according to the application scenario Create snapshots for which files in the FS, control the space used by the snapshot as much as possible, reduce the space occupied by the read-only snapshot, and make the FS on the critical path as available as possible to improve the competitiveness of the product.

Embodiment three

This embodiment provides a method for protecting stored data. In this embodiment, the file system fs1 includes multiple files, and the file names are file1, file2...file6 in sequence, and the file snapshot level attribute of the multiple files is snapLevel=none by default. Please refer to Figure 7, the method flow includes:

701. Receive an attribute setting instruction input by a user to set the value of the file snapshot level attribute of files file2 and file5 in the file system fs1 to 1.

702. Set the file snapshot level attributes of file2 and file5 to snapLvel=1 according to the attribute setting instruction.

703. Receive a snapshot creation instruction with snapLevel=1 input by a user, and the snapshot creation instruction requires creation of a ROW read-only snapshot with a snapshot level of 1 and a name of sanp1.

704. When the logical time point is 10, create a ROW read-only snapshot named snap1 with snapshot level 1.

705. Receive an attribute setting instruction input by the user to set the value of the file snapshot level attribute of the files file3 and file4 in the file system fs1 to 2.

706. Set the file snapshot level attributes of file3 and file4 to snapLevel=2 according to the attribute setting instruction.

707. Receive a snapshot creation instruction with snapLevel=2 input by the user, where the snapshot creation instruction requires creation of a snapshot with a snapshot level of 2 and named sanp2.

708. When the logical time point is 20, create a ROW read-only snapshot named snap2 with snapshot level 2.

Specifically, please refer to Figure 7. After the creation is completed, the system snapshot level attribute snapLevels of fs1 is recorded as: [1-10, 2-20], indicating that a Row with a snapshot level of 1 was created at the logical time point of 10 For read-only snapshots, a Row read-only snapshot with snapshot level 2 is created at logical time point 20; the read-only snapshot level attribute snaLevels of snap1 is recorded as: [1-10], indicating that the read-only snapshot is only protected Files with a snapshot level of 1 protect data before logical time point 10; the read-only snapshot level attribute snapLevels of snap2 is recorded as: [2-20], which means that the read-only snapshot only protects files with a snapshot level of 2, and its Protect data before logical time point 20. sanp1, sanp2 share root with fs1. However, the files file1 and file6 of the file system fs1 will not be protected by any ROW read-only snapshot because their file snapshot level is none.

Specifically, when accessing snap1 and snap2 and modifying the file of fs1, the processing method for each file is the same as that of the foregoing embodiment and will not be repeated here.

The method for protecting stored data provided by this embodiment adds a file snapshot level attribute to files in the file system, and the user sets different files to different snapshot levels by setting the file snapshot level attribute, and the user can at the same time When creating read-only snapshots for system files, specify the snapshot level of the files to be protected. Therefore, when modifying files in the file system, ROW read-only snapshots only protect the files specified by the user, and ROW read-only will not be performed for unspecified files. Snapshot protection can effectively save the space of the file system.

Embodiment Four

Referring to Figure 9, this embodiment provides a protection device for storing data, which includes:

The receiving unit 901 is used for an attribute setting instruction, the attribute setting instruction requests to set the file snapshot level attribute of the file in the file system;

The setting unit 902 is configured to set the file snapshot level attribute of the file according to the attribute setting instruction received by the receiving unit 901;

The receiving unit 901 is further configured to receive a snapshot creation instruction, and the snapshot creation instruction carries a file snapshot level attribute parameter of the file to be protected;

The snapshot creation unit 903 is configured to create a ROW read-only snapshot of a specified snapshot level for the file system according to the snapshot creation instruction received by the receiving unit 901, and set the ROW read-only snapshot according to the file snapshot level attribute parameter. Read snapshot level attributes;

The file protection unit 904 is configured to determine whether the file snapshot level attribute of the specified file matches the read-only snapshot level attribute of the created ROW read-only snapshot when modifying the specified file, and when matching, according to the established The created ROW read-only snapshot performs pre-write protection on the specified file.

Further, the snapshot creation unit 903 includes:

Create a module for creating the ROW read-only snapshot by sharing the root with the file system;

A setting module, configured to set the read-only snapshot level attribute of the ROW read-only snapshot according to the file snapshot level attribute after the creation module creates the ROW read-only snapshot, and set the read-only snapshot level attribute according to the System snapshot level attributes for the file system in question.

Further, the recording module is also configured to record the system snapshot level attribute as a set including [snapshot level-logical time point] pairs, wherein the snapshot level represents the created file protected by the ROW read-only snapshot The snapshot level of the snapshot level, the logical time point represents the logical time point at which the ROW read-only snapshot is created; the read-only snapshot level attribute is recorded as a set including the pair of [snapshot level-logical time point], wherein the snapshot The level indicates the snapshot level of the file to be protected, and the logical time point indicates the logical time point for creating the ROW read-only snapshot.

Further, the receiving unit 901 is also configured to receive a snapshot creation instruction carrying a snapshot name;

The creation module is further configured to name the ROW read-only snapshot according to the snapshot name carried in the snapshot creation instruction received by the receiving unit 901 .

Further, the receiving unit 901 is further configured to receive a request for accessing the ROW read-only snapshot after the snapshot creation unit creates the ROW read-only snapshot;

The device also includes:

The output unit is configured to output a file whose snapshot level attribute value is equal to the snapshot level value in the read-only snapshot level attribute of the ROW read-only snapshot.

Further, the receiving unit 901 is also configured to receive modification data of a specified file in the file system;

The device also includes:

A modification module, configured to modify the data of the specified file according to the modification data received by the receiving unit 901, and save the modified new data of the specified file to a new disk location;

A judging module, configured to judge whether there is a read-only snapshot level in the created ROW read-only snapshot of the file system after the modification module saves the modified new data of the specified file to a new disk location The ROW read-only snapshot whose snapshot level value of the attribute is equal to the value of the file snapshot level attribute of the specified file;

The root module is used to point the root of the ROW read-only snapshot to the specified file when the judging module determines that the ROW read-only snapshot whose level attribute matches the file snapshot level attribute of the specified file is stored. the old data;

The deletion module is used to delete the old data of the specified file before modification when the judging module determines that there is no ROW read-only snapshot whose read-only snapshot level attribute matches the file snapshot level attribute of the specified file.

In the protection device for storing data in this embodiment, by increasing the file snapshot level attribute of the file and setting the file snapshot level attribute, different files can be set to different snapshot levels, and at the same time when creating a ROW read-only snapshot for the system file Specify the snapshot level of the files to be protected by the ROW read-only snapshot, so that the ROW read-only snapshot only protects those important files that need to be protected. On this basis, users can also participate in the control of ROW read-only snapshots. Users can decide which files to create snapshots for FS according to application scenarios, control the space used by snapshots as much as possible, and reduce the FS occupied by ROW read-only snapshots. Space, make the FS on the critical path as available as possible, and improve the competitiveness of the product.

Embodiment five

Referring to Figure 10, this embodiment provides a protection device for storing data, which includes:

The receiver 1001 is configured to receive an attribute setting instruction, the attribute setting instruction requests to set a file snapshot level attribute of a file in the file system;

Processor 1002, configured to set the file snapshot level attribute of the file according to the attribute setting instruction received by the receiver;

The receiver 1001 is further configured to receive a snapshot creation instruction, where the snapshot creation instruction carries a file snapshot level attribute parameter of the file to be protected;

The processor 1002 is further configured to create a ROW read-only snapshot for the file system according to the snapshot creation instruction received by the receiver 1001, and set a read-only snapshot of the ROW read-only snapshot according to the file snapshot level attribute parameter level attribute; and used to determine whether the file snapshot level attribute of the specified file matches the read-only snapshot level attribute of the created ROW read-only snapshot when modifying the specified file, and when matching, according to the created The ROW read-only snapshot of the specified file is protected before writing.

Further, the processor 1002 is further configured to create the ROW read-only snapshot by sharing the root with the file system; set the read-only snapshot level attribute of the ROW read-only snapshot according to the file snapshot level attribute , and setting the system snapshot level attribute of the file system according to the read-only snapshot level attribute.

Further, the processor 1002 is further configured to record the system snapshot level attribute as a set including [snapshot level-logical time point] pairs, where the snapshot level represents the created snapshot of the ROW read-only snapshot level, the logical time point represents the logical time point for creating the ROW read-only snapshot; the read-only snapshot level attribute is recorded as a set including [snapshot level-logical time point] pairs, wherein the snapshot level represents the required protection The snapshot level of the file, and the logical time point indicates the logical time point when the ROW read-only snapshot is created.

Further, the receiver is also configured to receive a snapshot creation instruction carrying a snapshot name;

The processor is further configured to name the ROW read-only snapshot according to the snapshot name carried in the snapshot creation instruction received by the receiver.

Further, the receiver 1001 is further configured to receive a request for accessing the ROW read-only snapshot after the processor 1002 creates the ROW read-only snapshot;

The device also includes:

The sender is configured to output, according to the request received by the receiver 1002, a file whose snapshot level attribute value is equal to the snapshot level value in the read-only snapshot level attribute of the ROW read-only snapshot.

Further, the receiver 1001 is also configured to receive modification data for modifying a specified file in the file system;

The processor 1002 is further configured to modify the data of the specified file according to the modification data received by the receiver, and save the modified new data of the specified file to a new disk location; In the ROW read-only snapshot of the file system, whether there is a ROW read-only snapshot whose snapshot level value of the read-only snapshot level attribute is equal to the value of the file snapshot level attribute of the specified file, if it exists, the specified file is retained The old data before modification, and point the root of the ROW read-only snapshot to the old data of the specified file, if it does not exist, delete the old data of the specified file before modification.

The protection device for storing data provided by this embodiment, by increasing the file snapshot level attribute of the file, setting the file snapshot level attribute, different files can be set to different snapshot levels, and at the same time when creating a ROW read-only system file When taking a snapshot, specify the snapshot level of the files to be protected by the ROW read-only snapshot, so that the ROW read-only snapshot only protects those important files that need to be protected, which can effectively reduce the FS space occupied by the ROW read-only Available as much as possible to enhance the competitiveness of products.

To sum up, the method and device for protecting stored data provided by the embodiments of the present invention add file snapshot level attributes to files in the file system, and set different files into different snapshots by setting the file snapshot level attributes. level, and you can specify the snapshot level of the file to be protected when creating a ROW read-only snapshot for the system file. Whether the attribute of the read snapshot level matches determines whether to perform snapshot protection on the file. If it matches, the old data before the modification of the file is retained, otherwise, the old data before the modification of the file is deleted, so that users can participate in the control of ROW read-only snapshots. It is up to the user to decide which files of the FS to create snapshots according to the application scenario, to control the space used by the snapshot as much as possible, to reduce the space occupied by the ROW read-only snapshot, to make the FS on the critical path as available as possible, and to enhance the competitiveness of the product .

It should be noted that: when the protection device for stored data provided by the above-mentioned embodiments realizes the protection of stored data, the above-mentioned functional modules are only used as an example for illustration. In practical applications, the above-mentioned functions can be allocated by Completion of different functional modules means that the internal structure of the device is divided into different functional modules to complete all or part of the functions described above. In addition, the implementation of the device for protecting stored data provided by the above embodiments and the method for protecting stored data belong to the same concept, and the specific implementation process thereof can be found in the method embodiments for details, and will not be repeated here.

The serial numbers of the above embodiments of the present invention are for description only, and do not represent the advantages and disadvantages of the embodiments.

Those of ordinary skill in the art can understand that all or part of the steps for implementing the above embodiments can be completed by hardware, and can also be completed by instructing related hardware through a program. The program can be stored in a computer-readable storage medium. The above-mentioned The storage medium mentioned may be a read-only memory, a magnetic disk or an optical disk, and the like.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included in the protection of the present invention. within range.

Claims (12)

1. the guard method storing data, it is characterised in that described method includes:

Receiving attribute and arrange instruction, described attribute arranges instruction request, and to arrange the file of file in file system fast According to level attribute；

Instruction is set according to described attribute the File Snapshot level attribute of described file is set；

Receiving snapshot and create instruction, described snapshot creates in instruction and carries File Snapshot level attribute parameter, uses Document to be protected is needed with the read-only materialized view that instruction creates；

Create when instruction creates and uses for described file system and write according to described snapshot and redirect ROW technology ROW read-only materialized view, the read-only materialized view level attribute of described ROW read-only materialized view is according to described File Snapshot level Other property parameters is arranged；

When specified file is modified, it is judged that the File Snapshot level attribute of described specified file with create Whether the read-only materialized view level attribute of the ROW read-only materialized view built mates, and creates according to described when coupling ROW read-only materialized view described specified file is write front protection.

Method the most according to claim 1, it is characterised in that described establishment according to described snapshot instructs ROW read-only materialized view is created for described file system, including:

Described ROW read-only materialized view is created by the way of sharing root with described file system；

The read-only materialized view rank of described ROW read-only materialized view is set according to described File Snapshot level attribute parameter Attribute；

The system snapshot level attribute of described file system is set according to described read-only materialized view level attribute.

Method the most according to claim 2, it is characterised in that

Described system snapshot level attribute includes the set of snapshot rank-logical time point pair, wherein said snapshot Rank represents the snapshot rank of the file that described ROW read-only materialized view protects, and described logical time point represents establishment The logical time point of described ROW read-only materialized view；

Described read-only materialized view level attribute includes the set of snapshot rank-logical time point pair, wherein said snapshot Rank represents that the snapshot rank needing document to be protected, described logical time point represent that the described ROW of establishment is read-only The logical time point of snapshot.

Method the most according to claim 1, it is characterised in that described snapshot creates instruction and also carries fast According to title；

Described is, after described file system creates ROW read-only materialized view, also to wrap according to the establishment instruction of described snapshot Include:

According to ROW read-only materialized view described in described snapshot name nominating.

Method the most according to claim 3, it is characterised in that described establishment according to described snapshot instructs After creating ROW read-only materialized view for described file system, also include:

Receive the request accessing described ROW read-only materialized view；

The read-only materialized view level attribute of the value of output file snapshot level attribute and described ROW read-only materialized view The file that the value of snapshot rank is equal.

Method the most according to claim 3, it is characterised in that described specified file is being modified Time, it is judged that the File Snapshot level attribute of described specified file and the ROW read-only materialized view created read-only soon Whether mate according to level attribute, and coupling time according to the described ROW read-only materialized view created to described appointment File carries out writing front protection, including:

Receive the amendment data of described specified file；

According to the data of specified file described in described amendment data modification, and by amended described specified file New data be saved in new Disk Locality；

In the ROW read-only materialized view of the described file system that judgement has created, if there is read-only materialized view rank and belong to The ROW that the value of the snapshot rank of property is equal with the value of the File Snapshot level attribute of described specified file is read-only Snapshot；

If existing, retain the legacy data before the amendment of described specified file, and by the root of described ROW read-only materialized view Point to the legacy data of described specified file；Otherwise, the legacy data before the amendment of described specified file is deleted.

7. the protection device storing data, it is characterised in that including:

Receiving unit, be used for receiving attribute and arrange instruction, described attribute arranges instruction request and arranges file system The File Snapshot level attribute of middle file, and be used for receiving snapshot establishment instruction, described snapshot creates instruction In carry the File Snapshot level attribute parameter needing document to be protected；

Arranging unit, the attribute for receiving according to described reception unit arranges instruction and arranges the literary composition of described file Part snapshot level attribute；

Snapshot creating unit, the snapshot for receiving according to described reception unit creates instruction for described file system System creates ROW read-only materialized view, arranges described ROW according to described File Snapshot level attribute parameter read-only soon According to read-only materialized view level attribute；

File protected location, for when modifying to specified file, it is judged that the file of described specified file Whether snapshot level attribute mates with the read-only materialized view level attribute of the ROW read-only materialized view created, and Described specified file is write front protection according to the described ROW read-only materialized view created by timing.

Device the most according to claim 7, it is characterised in that described snapshot creating unit includes:

Creation module, read-only soon for creating described ROW by the way of sharing root with described file system According to；

Module is set, after creating described ROW read-only materialized view in described creation module, according to described literary composition Part snapshot level attribute arranges the read-only materialized view level attribute of described ROW read-only materialized view, and according to described Read snapshot level attribute and the system snapshot level attribute of described file system is set.

Device the most according to claim 8, it is characterised in that described arrange module, is additionally operable to institute State system snapshot level attribute and be recorded as including the set of snapshot rank-logical time point pair, wherein said snapshot Rank represents the snapshot rank of snapshot rank of the file of the described ROW read-only materialized view protection of establishment, described in patrol Collect time point and represent the logical time point creating described ROW read-only materialized view；By described read-only materialized view level attribute It is recorded as including that the set of snapshot rank-logical time point pair, wherein said snapshot rank represent that need are to be protected The snapshot rank of file, described logical time point represents the logical time point creating described ROW read-only materialized view.

Device the most according to claim 7, it is characterised in that

Described reception unit, is additionally operable to receive the snapshot establishment instruction carrying snapshot title；

Described device also includes:

Creation module, creates, for the snapshot received according to described reception unit, the snapshot title carried in instruction Name described ROW read-only materialized view.

11. devices according to claim 9, it is characterised in that

Described reception unit, is additionally operable to after described snapshot creating unit creates described ROW read-only materialized view, Receive the request accessing described ROW read-only materialized view；

Described device also includes:

Output unit, the value of the request output file snapshot level attribute for receiving according to described reception unit The file equal with the value of the snapshot rank in the read-only materialized view level attribute of described ROW read-only materialized view.

12. according to the device described in any one of claim 7 to 11, it is characterised in that

Described reception unit, is additionally operable to receive the amendment data of specified file in described file system；

Described file protected location also includes:

Modified module, revises the number of specified file described in data modification for receive according to described reception unit According to, and the new data of amended described specified file is saved in new Disk Locality；

Judge module, for being saved in the new data of amended described specified file at described modified module After new Disk Locality, it is judged that in the ROW read-only materialized view of the described file system created, if exist The value phase of the value of the snapshot rank of read-only materialized view level attribute and the File Snapshot level attribute of described specified file Deng ROW read-only materialized view；

Root module, for judging to there is read-only materialized view level attribute and described specified file at described judge module File Snapshot level attribute match ROW read-only materialized view time, the root of described ROW read-only materialized view is referred to Legacy data to described specified file；

Removing module, for judging to there is not read-only materialized view level attribute and described appointment at described judge module During the ROW read-only materialized view that the File Snapshot level attribute of file matches, before deleting the amendment of described specified file Legacy data.