CN112579357B - Snapshot difference obtaining method, device, equipment and storage medium - Google Patents

Abstract

The invention discloses a snapshot delta obtaining method, a device, equipment and a storage medium, wherein the method comprises the following steps: compressing the snapshot difference file to generate a compressed file; storing the compressed file through a compressed file system; when a file calling instruction is received, acquiring a target compressed file from the compressed file system according to the file calling instruction; and decompressing the target compressed file to obtain a target snapshot differential file. In the invention, the snapshot difference file is compressed to generate a compressed file and stored in the compressed file system, and then when the file needs to be called, the target compressed file is obtained from the compressed file system and decompressed to obtain the target snapshot difference file, so that the physical disk occupation of the stored snapshot difference file is reduced, and the performance overhead of the acquisition snapshot difference file is reduced.

Description

Snapshot differential acquisition method, device, equipment and storage medium

technical field

The present invention relates to the field of computer technology, in particular to a method, device, equipment and storage medium for acquiring snapshot difference.

Background technique

At present, the snapshot difference files are generally stored using the sparse file system, but storing the snapshot difference files through the sparse file system will cause a particularly large physical disk occupation. When calling the snapshot difference file, it needs to be called from the sparse file system , increasing performance overhead.

The above content is only used to assist in understanding the technical solution of the present invention, and does not mean that the above content is admitted as prior art.

Contents of the invention

The main purpose of the present invention is to propose a snapshot difference acquisition method, device, equipment and storage medium, aiming to solve the problem that the method of storing and obtaining snapshot difference files in the prior art will occupy a relatively large physical disk, and the performance overhead is too large technical issues.

In order to achieve the above object, the present invention provides a snapshot differential acquisition method, the snapshot differential acquisition method includes the following steps:

Compress the snapshot snapshot difference file to generate a compressed file;

storing the compressed file through a compressed file system;

When receiving the file call instruction, obtain the target compressed file from the compressed file system according to the file call instruction;

The target compressed file is decompressed to obtain the target snapshot difference file.

Optionally, when the file calling instruction is received, obtaining the target compressed file from the compressed file system according to the file calling instruction includes:

When receiving the file calling instruction, determine the target file information according to the file calling instruction;

Determine the target file identifier according to the target file information;

The target compressed file is acquired from the compressed file system according to the target file identifier.

Optionally, the obtaining the target compressed file from the compressed file system according to the target file identifier includes:

matching the target file identifier with the file identifier in the first mapping list;

determining the target compressed file corresponding to the target file identifier according to the matching result;

Find the target file address corresponding to the target compressed file, and acquire the target compressed file from the compressed file system according to the target file address.

Optionally, before the matching of the target file identifier with the file identifier in the first mapping list, further includes:

Allocate file identifiers for each compressed file, and establish a first mapping list according to the file identifier and the compressed file, and record the corresponding relationship between the file identifier and the compressed file in the first mapping list.

Optionally, the determining the target file identifier according to the target file information includes:

determining difference file information according to the target file information, and extracting a target difference file name from the difference file information;

matching the name of the target difference file with the name of the difference file in the second mapping list;

Determine the target file identifier corresponding to the target difference file name according to the matching result.

Optionally, before matching the name of the target difference file with the name of the difference file in the second mapping list, the method further includes:

Obtain the difference file name of each snapshot difference file;

Establish a second mapping list according to the difference file name and the file identifier of the compressed file corresponding to the snapshot difference file, and record the correspondence between the difference file name and the file identifier in the second mapping list relation.

Optionally, the determining difference file information according to the target file information includes:

Determine the file to be called according to the target file information, and detect whether there is a difference file in the file to be called;

When there is a difference file in the file to be called, search for difference file information corresponding to the file to be called.

Optionally, after decompressing the target compressed file to obtain the target snapshot difference file, the method further includes:

Perform data processing on the file to be called according to the target snapshot difference file to obtain a target file.

Optionally, before performing compression processing on the snapshot snapshot difference file to generate the compressed file, the method further includes:

When the snapshot file is received, the snapshot file is detected to determine the file type corresponding to the snapshot file;

A snapshot difference file is generated according to the file type and the snapshot file.

Optionally, the generating a snapshot difference file according to the file type and the snapshot file includes:

Determine whether the file type is a pointer snapshot;

When the file type is a pointer snapshot, the snapshot file is used as a snapshot difference file.

Optionally, after the judging whether the file type is a pointer snapshot, it also includes:

When the file type is not a pointer snapshot, determine whether the file type is a mirror snapshot;

When the file type is a mirror image snapshot, find the original file corresponding to the snapshot file;

A snapshot difference file is generated according to the snapshot file and the original file.

Optionally, performing compression processing on the snapshot snapshot difference file to generate a compressed file includes:

Splitting the snapshot difference file into multiple files to be compressed in order, and recording the corresponding sequence of the files to be compressed;

Perform compression processing on the files to be compressed according to the corresponding sequence of the files to be compressed, so as to generate compressed files.

Optionally, the decompressing the target compressed file to obtain the target snapshot difference file includes:

Decompressing the target compressed file to obtain multiple decompressed files;

Detecting the arrangement sequence of the decompressed files;

The decompressed files are sorted according to the sequence of the decompressed files to obtain the target snapshot difference file.

In addition, in order to achieve the above purpose, the present invention also proposes a device for obtaining a snapshot difference, the device for obtaining a snapshot difference includes:

A file compression module, configured to compress the snapshot snapshot difference file to generate a compressed file;

A file storage module, configured to store the compressed file through a compressed file system;

A file calling module, configured to obtain a target compressed file from the compressed file system according to the file calling instruction when receiving the file calling instruction;

The file decompression module is configured to decompress the target compressed file to obtain the target snapshot difference file.

Optionally, the file calling module is further configured to, when receiving a file calling instruction, determine target file information according to the file calling instruction; determine a target file identifier according to the target file information; The target compressed file is obtained from the compressed file system.

Optionally, the file calling module is further configured to match the target file identifier with the file identifier in the first mapping list;

Determine the target compressed file corresponding to the target file identifier according to the matching result; find the target file address corresponding to the target compressed file, and obtain the target compressed file from the compressed file system according to the target file address.

Optionally, the file calling module is further configured to assign a file identifier to each compressed file, and establish a first mapping list according to the file identifier and the compressed file, and the file is recorded in the first mapping list A corresponding relationship between the identifier and the compressed file.

Optionally, the file calling module is further configured to determine difference file information according to the target file information, and extract a target difference file name from the difference file information; The name of the difference file in is matched; and the target file identifier corresponding to the name of the target difference file is determined according to the matching result.

In addition, in order to achieve the above object, the present invention also proposes a device for acquiring snapshot difference, which includes: a memory, a processor, and a snapshot stored on the memory and operable on the processor A difference acquisition program, when the snapshot difference acquisition program is executed by the processor, implements the steps of the method for acquiring the snapshot difference as described above.

In addition, in order to achieve the above object, the present invention also proposes a storage medium, on which a snapshot difference acquisition program is stored, and when the snapshot difference acquisition program is executed by a processor, the above-mentioned snapshot difference acquisition is realized. method steps.

The snapshot difference acquisition method proposed by the present invention generates a compressed file by compressing the snapshot difference file; stores the compressed file through a compressed file system; The instruction obtains a target compressed file from the compressed file system; decompresses the target compressed file to obtain a target snapshot difference file. In the present invention, the snapshot difference file is compressed to generate a compressed file and stored in the compressed file system, and then when the file needs to be called, the target compressed file is obtained from the compressed file system and decompressed to obtain the target snapshot difference file, which reduces the The physical disk used to store snapshot difference files, thereby reducing the performance overhead when obtaining snapshot difference files.

Description of drawings

FIG. 1 is a schematic structural diagram of a snapshot difference acquisition device of a hardware operating environment involved in the solution of an embodiment of the present invention;

Fig. 2 is a schematic flow chart of the first embodiment of the method for acquiring snapshot difference in the present invention;

Fig. 3 is a schematic diagram of file compression storage in an embodiment of the method for acquiring snapshot difference in the present invention;

FIG. 4 is a schematic flow chart of the second embodiment of the method for acquiring snapshot difference in the present invention;

Fig. 5 is a schematic flow chart of the third embodiment of the method for acquiring snapshot difference in the present invention;

FIG. 6 is a schematic flowchart of a fourth embodiment of the snapshot difference acquisition method of the present invention;

FIG. 7 is a schematic diagram of functional modules of the first embodiment of the device for acquiring snapshot difference in the present invention.

The realization of the purpose of the present invention, functional characteristics and advantages will be further described in conjunction with the embodiments and with reference to the accompanying drawings.

Detailed ways

It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

Referring to FIG. 1 , FIG. 1 is a schematic structural diagram of a snapshot difference acquisition device of a hardware operating environment involved in an embodiment of the present invention.

As shown in FIG. 1 , the snapshot difference acquisition device may include: a processor 1001 , such as a central processing unit (Central Processing Unit, CPU), a communication bus 1002 , a user interface 1003 , a network interface 1004 , and a memory 1005 . Wherein, the communication bus 1002 is used to realize connection and communication between these components. The user interface 1003 may include a display screen (Display) and an input unit such as a button, and the optional user interface 1003 may also include a standard wired interface and a wireless interface. Optionally, the network interface 1004 may include a standard wired interface and a wireless interface (such as a WI-FI interface). The memory 1005 may be a high-speed random access memory (Random Access Memory, RAM) memory, or a stable memory (non-volatile memory), such as a disk memory. Optionally, the memory 1005 may also be a storage device independent of the aforementioned processor 1001 .

Those skilled in the art can understand that the device structure shown in FIG. 1 does not constitute a limitation on the snapshot difference acquisition device, and may include more or less components than those shown in the figure, or combine certain components, or different components. layout.

As shown in FIG. 1 , the memory 1005 as a storage medium may include an operating system, a network communication module, a user interface module, and a snapshot difference acquisition program.

In the snapshot difference acquisition device shown in FIG. 1 , the network interface 1004 is mainly used to connect to an external network and perform data communication with other network devices; the user interface 1003 is mainly used to connect to user equipment and perform data communication with the user equipment; The device of the present invention invokes the snapshot difference acquisition program stored in the memory 1005 through the processor 1001, and executes the snapshot difference acquisition method provided by the embodiment of the present invention.

Based on the above-mentioned hardware structure, an embodiment of the snapshot difference acquisition method of the present invention is proposed.

Referring to FIG. 2 , FIG. 2 is a schematic flowchart of a first embodiment of a method for acquiring a snapshot difference in the present invention.

In the first embodiment, the snapshot difference acquisition method includes the following steps:

Step S10, compressing the snapshot difference file to generate a compressed file.

It should be noted that the execution subject of this embodiment may be a snapshot difference acquisition device, such as a terminal device, or other devices that can implement the same or similar functions, which is not limited in this embodiment. In this embodiment, A terminal device is used as an example for description. Wherein, the terminal device may include devices such as mobile phones and IOT devices, and may also include other devices, which are not limited in this embodiment.

It should be understood that currently, the snapshot difference files are generally stored through a sparse file system, but this method will occupy a relatively large physical disk. In this embodiment, in order to overcome this problem, a compressed file system is used to store the The snapshot difference file is stored to reduce the physical disk usage.

It can be understood that since the compressed file system is used to store the snapshot differential file, and the compressed file system is used to store compressed files, and in order to save storage space, the snapshot differential file can be compressed first to generate Compressed file. Since the compressed file is smaller than the original snapshot difference file, it occupies a smaller physical disk.

Step S20, storing the compressed file through the compressed file system.

It should be understood that after the compressed file is generated, the compressed file may be stored through the compressed file system, specifically, the compressed file may be mounted on the compressed file system to obtain the effect of storing the compressed file.

It can be understood that since there may be multiple snapshot difference files, these snapshot difference files may be compressed respectively to obtain multiple compressed files, and these compressed files will be stored through the compressed file system.

Step S30, when the file calling instruction is received, the target compressed file is obtained from the compressed file system according to the file calling instruction.

It should be understood that, when the terminal device receives the file calling instruction, it may determine the target compressed file to be called according to the file calling instruction, and then obtain the target compressed file from the compressed file system.

In the specific implementation, as shown in Figure 3, Figure 3 is a schematic diagram of file compression storage, assuming that there are three snapshot difference files, namely: difference file 1, difference file 2 and difference file 3, which can be respectively Compress the 3 snapshot difference files to generate 3 compressed files, namely: compressed file 1, compressed file 2 and compressed file 3, and then store compressed file 1, compressed file 2 and compressed file 3 in the compressed file system , and then, when the file calling instruction is received, the target compressed file can be extracted from the compressed file system according to the file calling instruction.

Step S40, decompressing the target compressed file to obtain a target snapshot difference file.

It should be understood that after the target compressed file is obtained from the compressed file system, the target compressed file can be decompressed, and then the target snapshot difference file can be obtained. In specific implementation, for example, when the target compressed file to be obtained is determined to be the compressed file 2 according to the file calling instruction, the compressed file 2 can be obtained from the compressed file system, and the compressed file 2 can be decompressed to obtain the difference file 2, Use difference file 2 as the target snapshot difference file.

In this embodiment, the snapshot difference file is compressed to generate a compressed file; the compressed file is stored through the compressed file system; The target compressed file is obtained in the system; the target compressed file is decompressed to obtain the target snapshot difference file. In this embodiment, the snapshot difference file is compressed to generate a compressed file and stored in the compressed file system, and then when the file needs to be called, the target compressed file is obtained from the compressed file system and decompressed to obtain the target snapshot difference file, reducing the The physical disk occupation for storing snapshot difference files is reduced, thereby reducing the performance overhead when obtaining snapshot difference files.

In one embodiment, as shown in FIG. 4 , based on the first embodiment, a second embodiment of the snapshot difference acquisition method of the present invention is proposed. The step S30 includes:

Step S301, when a file calling instruction is received, determine target file information according to the file calling instruction.

It should be understood that, when the file calling instruction is received, the target file information may be determined according to the file calling instruction, wherein the target file information is the file information to be called by the file calling instruction.

Step S302, determining a target file identifier according to the target file information.

It can be understood that after the target file information is determined, the target file identifier can be determined according to the target file information, and then the target compressed file can be obtained from the compressed file system according to the target file identifier.

Step S303, acquiring a target compressed file from the compressed file system according to the target file identifier.

It should be understood that, after compressing the snapshot difference files to obtain compressed files, a file identifier can be assigned to each compressed file, because the file identifier is unique. Therefore, after the target file identifier is determined, the target file can be Identifies getting the target archive from the archive system.

Further, in order to more quickly determine the corresponding compressed file according to the file identifier, and conveniently obtain the compressed file from the compressed file system, and improve the efficiency of file acquisition, the said obtaining from the compressed file system according to the target file identifier Target compressed files, including:

Matching the target file identifier with the file identifier in the first mapping list; determining the target compressed file corresponding to the target file identifier according to the matching result; searching for the target file address corresponding to the target compressed file, and according to the The target file address obtains the target compressed file from the compressed file system.

It should be understood that the first mapping list can be established in advance according to the file identifier and the compressed file. After the target file identifier is determined, the target file identifier can be matched with the file identifier in the first mapping list, and then determined according to the matching result. The file identifier corresponds to the target compressed file.

Further, before matching the target file identifier with the file identifier in the first mapping list, it also includes:

Allocate file identifiers for each compressed file, and establish a first mapping list according to the file identifier and the compressed file, and record the corresponding relationship between the file identifier and the compressed file in the first mapping list.

It can be understood that, after the compressed files are obtained, a file identifier may be assigned to each compressed file, and a first mapping list may be established according to the file identifier and the compressed file. In a specific implementation, for example, three compressed files are generated, namely compressed file 1, compressed file 2, and compressed file 3, and file identifier 1 can be assigned to compressed file 1, and file identifier 2 can be assigned to compressed file 2. 3 assign file identification 3, and then just can establish the first mapping list according to above compressed file and file identification, wherein, there is correspondence between compressed file 1 and file identification 1, there is correspondence between compressed file 2 and file identification 2, There is a corresponding relationship between the compressed file 3 and the file ID 3 . If the target file identifier is file identifier 2, then the compressed file 2 corresponding to the file identifier 2 can be used as the target compressed file.

It should be understood that when the compressed file is stored through the compressed file system, the compressed file is generally stored in a certain block space in the compressed file system, and in order to distinguish the storage space of different compressed files, the compressed When the file is stored, the file address of the compressed file in the compressed file system is recorded.

In a specific implementation, for example, when storing compressed file 1 in the compressed file system, the file address 1 corresponding to compressed file 1 can be recorded, and when storing compressed file 2 in the compressed file system, it can be recorded. When the compressed file 3 is stored in the compressed file system, the file address 3 corresponding to the compressed file 3 can be recorded.

It can be understood that, after determining the target compressed file corresponding to the target file identifier, the target file address corresponding to the target compressed file can be searched, specifically, a third mapping list is established according to the compressed file and the file address, and the third mapping list records There is a corresponding relationship between the compressed file and the file address. After the target compressed file is determined, the target file address corresponding to the target compressed file is searched according to the third mapping list.

In a specific implementation, for example, when the target compressed file is compressed file 2, the target file address corresponding to compressed file 2 may be found as file address 2 according to the third mapping list.

Further, in order to improve the efficiency of determining the target file identifier according to the target file information and increase the speed of difference acquisition, the determining the target file identifier according to the target file information includes:

Determine the difference file information according to the target file information, and extract the target difference file name from the difference file information; match the target difference file name with the difference file name in the second mapping list; determine and match according to the matching result The target file identifier corresponding to the target difference file name.

It should be understood that after the target file information is determined, the difference file information can be determined according to the target file information, which can be specifically: determine the file to be called according to the target file information, and detect whether there is a difference file in the file to be called; For a difference file, search for the difference file information corresponding to the file to be called.

It is understandable that some files have difference files when calling files, so the target compressed file needs to be obtained from the compressed file system to decompress to obtain the target snapshot difference file, but some files do not have difference files. In this case, if the step of obtaining the target compressed file from the compressed file system is still carried out, the target compressed file cannot be obtained, resulting in low operating efficiency of the system and prone to failure.

In this embodiment, in order to improve the operating efficiency of the system and reduce the probability of failure, after determining the file to be called, it is possible to detect whether there is a difference file in the file to be called. The step of invoking the difference file information corresponding to the file. And if there is no difference file in the file to be called, the file to be called is directly fed back to the calling process as the target file.

It should be understood that, after determining the difference file information corresponding to the file to be called through the above steps, the difference file name can be extracted from the difference file information, and then the target file identifier corresponding to the difference file name can be searched according to the second mapping list.

Further, before matching the name of the target difference file with the name of the difference file in the second mapping list, it also includes:

Obtain the difference file name of each snapshot difference file; establish a second mapping list according to the difference file name and the file identifier of the compressed file corresponding to the snapshot difference file, and record the difference in the second mapping list The corresponding relationship between the file name and the file identifier.

It should be understood that since each snapshot difference file has a corresponding file name, different snapshot difference files can be distinguished by the file name, therefore, the difference file name of each snapshot difference file can be obtained, and based on the difference file The name and the file identifier of the compressed file corresponding to the snapshot difference file establish a second mapping list, and then after the target difference file name is determined, the target file identifier corresponding to the target difference file name can be searched according to the second mapping list.

In a specific implementation, for example, the three snapshot difference files are: difference file 1, difference file 2 and difference file 3, difference file 1 corresponds to the name of the first difference file, difference file 2 corresponds to the name of the second difference file, difference file 3 corresponds to the third difference file name. The difference file 1 corresponds to the compressed file 1, the compressed file 1 corresponds to the file ID 1, the difference file 2 corresponds to the compressed file 2, the compressed file 2 corresponds to the file ID 2, the difference file 3 corresponds to the compressed file 3, and the compressed file 3 corresponds to the file ID 3. Therefore, it can be determined that the correspondence between the difference file name and the file identifier of the compressed file corresponding to the snapshot difference file is: the first difference file name corresponds to file identifier 1, the second difference file name corresponds to file identifier 2, and the third difference file The name corresponds to the file ID 3. Therefore, the second mapping list may be established according to the correspondence between the difference file name and the file identifier.

In a specific implementation, when the name of the target difference file is the name of the second difference file, the file identifier 2 corresponding to the name of the second difference file can be searched from the second mapping class table, and the file identifier 2 is used as the name corresponding to the name of the target difference file. The target file ID for .

Further, since the file calling instruction may be for calling a complete file instead of a differential file, after decompressing the target compressed file to obtain the target snapshot differential file, the method further includes:

Perform data processing on the file to be called according to the target snapshot difference file to obtain a target file.

It can be understood that the data processing can be data restoration processing. Since the snapshot difference file stores the difference data of the file, after obtaining the target snapshot difference file, it can be extracted from the target snapshot difference file. For the target difference data, data restoration processing is performed on the file to be called according to the target difference data to obtain the target file, and then the target file is fed back to the calling process.

In this embodiment, when a file calling instruction is received, the target file information is determined according to the file calling command; the target file identifier is determined according to the target file information; the target is obtained from the compressed file system according to the target file identifier Compressed files, so that the target file ID can be determined according to the call instruction by assigning a file ID to the compressed file, and the target compressed file can be accurately obtained from the compressed file system according to the target file ID, and the efficiency of obtaining the target compressed file is improved. .

In one embodiment, as shown in FIG. 5 , based on the first embodiment or the second embodiment, a third embodiment of the snapshot difference acquisition method of the present invention is proposed. In this embodiment, description is made based on the first embodiment, so Before the step S10, it also includes:

Step S01 , when a snapshot file is received, the snapshot file is detected to determine the file type corresponding to the snapshot file.

It should be understood that snapshots are roughly divided into two types, one is called copy-on-write (copy-on-write) snapshot, usually also called pointer snapshot, VSS belongs to this type, and the other is called split mirror Snapshots are often called mirrored snapshots. Pointer-type snapshots take up less space and have little impact on system performance. However, if there is no backup and the original data disk is damaged, the data cannot be recovered; while mirror-type snapshots are actually a full image of the data at that time, which will cause a certain load on system performance. , but even if the original data is damaged, it will not have much impact, but it will take up an equal capacity of space.

Therefore, in this embodiment, file types can be divided into pointer snapshots and mirror snapshots. When a snapshot file is received, the snapshot file can be detected first to determine whether the file type corresponding to the snapshot file is a pointer snapshot or a mirror image. Which of the type snapshots.

Step S02, generating a snapshot difference file according to the file type and the snapshot file.

It can be understood that, after the file type of the snapshot file is determined, different methods may be used to generate the snapshot difference file according to different file types.

Further, said generating a snapshot difference file according to said file type and said snapshot file includes:

Determine whether the file type is a pointer snapshot; if the file type is a pointer snapshot, use the snapshot file as a snapshot difference file.

It should be understood that it is possible to first determine whether the file type is a pointer snapshot. When the file type is a pointer snapshot, since the snapshot file itself stores the difference in this case, the snapshot file can be directly used as the snapshot difference file .

Further, after the judging whether the file type is a pointer snapshot, it also includes:

When the file type is not a pointer snapshot, determine whether the file type is a mirror snapshot; when the file type is a mirror snapshot, find the original file corresponding to the snapshot file; according to the snapshot file and The original file generates a snapshot difference file.

It should be understood that, when the file type is not a pointer snapshot, it can be further judged whether the file type is a mirror snapshot, and when the file type is a mirror snapshot, it means that the snapshot file records a complete mirror file at this time. Therefore, in this case, in order to obtain the snapshot difference, the original file corresponding to the snapshot file may be searched, and the snapshot file is compared with the original file to generate the snapshot difference file.

It can be understood that, if the snapshot file is determined to be neither a pointer snapshot nor a mirror snapshot after performing the above determination steps, it may indicate that there may be a detection error. Therefore, when the file type is not a mirror snapshot, return to the step of judging whether the file type is a pointer snapshot, and when this situation is repeated many times, it can be determined that the file type detection has failed, and the file type detection step can be suspended , and feedback an error message.

In this embodiment, when the snapshot file is received, the snapshot file is detected to determine the file type corresponding to the snapshot file, and a snapshot difference file is generated according to the file type and the snapshot file, which can be obtained according to The snapshot file is processed in a manner adapted to the file type to obtain a snapshot difference file, which improves the generation efficiency of the snapshot difference file.

In one embodiment, as shown in FIG. 6 , the fourth embodiment of the method for acquiring snapshot difference of the present invention is proposed based on the first embodiment or the second embodiment or the third embodiment. In this embodiment, based on the first embodiment For example, the step S10 includes:

Step S101, splitting the snapshot difference file into multiple files to be compressed in sequence, and recording the corresponding sequence of the files to be compressed.

It should be understood that since the file size of the snapshot difference file may be large, the effect of directly compressing it may not be very good, and in order to maintain the order of the difference, the snapshot difference file can be split into multiple files to be compressed.

In a specific implementation, when the snapshot difference file is file 2, file 2 can be split into five files to be compressed, namely: file 21, file 22, file 23, file 24, and file 25, and then the files can be recorded 21. The arrangement order of file 22, file 23, file 24 and file 25 is file 21-file 25.

Step S102, perform compression processing on the file to be compressed according to the corresponding sequence of the file to be compressed, so as to generate a compressed file.

It should be understood that the compressed files may be compressed according to the order in which they are arranged to obtain multiple sub-compressed files, and then the compressed files are generated according to the sub-compressed files.

In specific implementation, file 21, file 22, file 23, file 24 and file 25 can be compressed to obtain sub-compressed file 21, sub-compressed file 22, sub-compressed file 23, sub-compressed file 24 and sub-compressed file 25, Then perform secondary compression processing on these sub-compressed files to obtain compressed file 2 .

Further, in order to accurately obtain the target snapshot difference file, the decompressing the target compressed file to obtain the target snapshot difference file includes:

Decompressing the target compressed file to obtain multiple decompressed files; detecting the sequence of the decompressed files; sorting the decompressed files according to the sequence of the decompressed files to obtain the target snapshot difference file.

It should be understood that the target compressed file can be decompressed to obtain multiple target sub-compressed files, and then each target sub-compressed file can be decompressed to obtain multiple decompressed files, and then the arrangement order of the decompressed files can be detected. Sort the decompressed files sequentially to obtain the target snapshot difference file.

In a specific implementation, when the target compressed file is the compressed file 2, the compressed file 2 can be decompressed to obtain the sub-compressed file, the sub-compressed file 22, the sub-compressed file 23, the sub-compressed file 24 and the sub-compressed file 25, and then respectively Decompress these sub-compressed files to obtain file 21, file 22, file 23, file 24 and file 25, use file 21, file 22, file 23, file 24 and file 25 as decompressed files, and decompress them according to the order of arrangement Files are sorted to obtain the target snapshot difference file.

In this embodiment, the snapshot difference file is split into a plurality of files to be compressed in sequence, and the sequence corresponding to the files to be compressed is recorded; Compression processing to generate a compressed file. Since there may be a large snapshot difference file, the snapshot difference file can be split into multiple files for compression, which improves the compression efficiency and further reduces the physical disk occupancy.

In addition, an embodiment of the present invention also proposes a storage medium, on which a snapshot difference acquisition program is stored, and when the snapshot difference acquisition program is executed by a processor, the above-mentioned snapshot difference acquisition method is implemented. step.

Since the storage medium adopts all the technical solutions of all the above-mentioned embodiments, it at least has all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be repeated here.

In addition, referring to FIG. 7 , an embodiment of the present invention also proposes a snapshot difference acquisition device, the snapshot difference acquisition device includes:

The file compression module 10 is configured to compress the snapshot difference file to generate a compressed file.

The file storage module 20 is configured to store the compressed file through a compressed file system.

The file calling module 30 is configured to obtain the target compressed file from the compressed file system according to the file calling instruction when receiving the file calling instruction.

The file decompression module 40 is configured to decompress the target compressed file to obtain the target snapshot difference file.

In this embodiment, the snapshot difference file is compressed to generate a compressed file; the compressed file is stored through the compressed file system; The target compressed file is obtained in the system; the target compressed file is decompressed to obtain the target snapshot difference file. In this embodiment, the snapshot difference file is compressed to generate a compressed file and stored in the compressed file system, and then when the file needs to be called, the target compressed file is obtained from the compressed file system and decompressed to obtain the target snapshot difference file, reducing the The physical disk occupation for storing snapshot difference files is reduced, thereby reducing the performance overhead when obtaining snapshot difference files.

In one embodiment, the file invoking module 30 is further configured to obtain the difference file name of each snapshot difference file; and establish the first step according to the difference file name and the file identifier of the compressed file corresponding to the snapshot difference and a mapping list, the correspondence between the difference file names and the file identifiers is recorded in the second mapping list.

In one embodiment, the file calling module 30 is further configured to determine the file to be called according to the target file information, and detect whether there is a difference file in the file to be called; when there is a difference file in the file to be called, Find the difference file information corresponding to the file to be called.

In an embodiment, the file calling module 30 is further configured to perform data processing on the file to be called according to the target snapshot difference file, so as to obtain a target file.

In an embodiment, the snapshot difference acquisition device further includes a difference file module, configured to detect the snapshot file when receiving the snapshot file, so as to determine the file type corresponding to the snapshot file; according to the The above file type and the above snapshot file generate a snapshot difference file.

In an embodiment, the differential file module is further configured to determine whether the file type is a pointer snapshot; if the file type is a pointer snapshot, use the snapshot file as a snapshot differential file.

In an embodiment, the differential file module is further configured to determine whether the file type is a mirror snapshot when the file type is not a pointer snapshot; when the file type is a mirror snapshot, Find the original file corresponding to the snapshot file; generate a snapshot difference file according to the snapshot file and the original file.

In one embodiment, the file compression module 10 is further configured to sequentially split the snapshot difference file into a plurality of files to be compressed, and record the sequence corresponding to the files to be compressed; according to the file to be compressed Perform compression processing on the to-be-compressed files in the corresponding sequence to generate compressed files.

In one embodiment, the file decompression module 40 is further configured to decompress the target compressed file to obtain a plurality of decompressed files; detect the arrangement order of the decompressed files; Sorting the decompressed files to obtain target snapshot difference files.

For other embodiments or specific implementation methods of the apparatus for obtaining snapshot difference in the present invention, reference may be made to the above-mentioned method embodiments, which will not be repeated here.

It should be noted that, in this document, the term "comprising", "comprising" or any other variation thereof is intended to cover a non-exclusive inclusion such that a process, method, article or apparatus comprising a set of elements includes not only those elements, It also includes other elements not expressly listed, or elements inherent in the process, method, article, or device. Without further limitations, an element defined by the phrase "comprising a ..." does not preclude the presence of additional identical elements in the process, method, article, or apparatus comprising that element.

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.

Through the description of the above embodiments, those skilled in the art can clearly understand that the methods of the above embodiments can be implemented by means of software plus a necessary general-purpose hardware platform, and of course also by hardware, but in many cases the former is better implementation. Based on this understanding, the essence of the technical solution of the present invention or the part that contributes to the prior art can be embodied in the form of a software product, which is stored in a computer-readable storage medium as described above (such as ROM/RAM, magnetic disk, optical disk), including several instructions to make a smart device (which can be a mobile phone, an estimator, a snapshot difference acquisition device, or a network snapshot difference acquisition device, etc.) execute each method of the present invention. The method described in the examples.

The above are only preferred embodiments of the present invention, and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by using the description of the present invention and the contents of the accompanying drawings, or directly or indirectly used in other related technical fields , are all included in the scope of patent protection of the present invention in the same way.

Claims (17)

1. A snapshot delta acquisition method is characterized by comprising the following steps:

compressing the snapshot delta file to generate a compressed file;

storing the compressed file through a compressed file system;

when a file calling instruction is received, acquiring a target compressed file from the compressed file system according to the file calling instruction;

decompressing the target compressed file to obtain a target snapshot differential file;

before compressing the snapshot delta file to generate a compressed file, the method further includes:

when a snapshot file is received, detecting the snapshot file to determine a file type corresponding to the snapshot file;

generating a snapshot difference quantity file according to the file type and the snapshot file;

the generating a snapshot delta file according to the file type and the snapshot file comprises:

judging whether the file type is a pointer type snapshot or not;

when the file type is a pointer snapshot, the snapshot file is used as a snapshot difference file;

after the step of judging whether the file type is the pointer type snapshot, the method further comprises the following steps:

when the file type is not the pointer snapshot, judging whether the file type is the mirror snapshot or not;

when the file type is a mirror image type snapshot, searching an original file corresponding to the snapshot file;

and generating a snapshot difference file according to the snapshot file and the original file.

2. The snapshot delta acquisition method as recited in claim 1, wherein said acquiring a target compressed file from said compressed file system according to a file call instruction when receiving said file call instruction comprises:

when a file calling instruction is received, determining target file information according to the file calling instruction;

determining a target file identifier according to the target file information;

and acquiring a target compressed file from the compressed file system according to the target file identifier.

3. The snapshot delta acquisition method as recited in claim 2 wherein said acquiring a target compressed file from said compressed file system based on said target file identification comprises:

matching the target file identification with the file identification in the first mapping list;

determining a target compressed file corresponding to the target file identifier according to the matching result;

and searching a target file address corresponding to the target compressed file, and acquiring the target compressed file from the compressed file system according to the target file address.

4. The snapshot delta acquisition method as recited in claim 3, wherein prior to said matching said target file identification with a file identification in a first mapping list, further comprising:

distributing file identifications for each compressed file, and establishing a first mapping list according to the file identifications and the compressed files, wherein the first mapping list records the corresponding relation between the file identifications and the compressed files.

5. The snapshot delta acquisition method as recited in claim 4 wherein said determining a target file identification based on said target file information comprises:

determining difference file information according to the target file information, and extracting a target difference file name from the difference file information;

matching the target differential file name with the differential file name in a second mapping list;

and determining a target file identifier corresponding to the target difference file name according to the matching result.

6. The snapshot delta acquisition method as recited in claim 5 wherein prior to said matching said target differential file name to a differential file name in a second mapping list, further comprising:

acquiring a difference file name of each snapshot difference quantity file;

and establishing a second mapping list according to the difference file name and the file identifier of the compressed file corresponding to the snapshot difference amount file, wherein the second mapping list records the corresponding relation between the difference file name and the file identifier.

7. The snapshot delta acquisition method as recited in claim 5 wherein said determining differential file information based on said target file information comprises:

determining a file to be called according to the target file information, and detecting whether the file to be called has a difference file;

and when the file to be called has a difference file, searching the difference file information corresponding to the file to be called.

8. The snapshot delta acquisition method according to claim 7, wherein after said decompressing the target compressed file to obtain the target snapshot delta file, further comprising:

and carrying out data processing on the file to be called according to the target snapshot difference file so as to obtain a target file.

9. The snapshot delta acquisition method according to any one of claims 1 to 8, wherein said compressing the snapshot delta file to generate a compressed file comprises:

splitting the snapshot difference file into a plurality of files to be compressed according to a sequence, and recording a corresponding arrangement sequence of the files to be compressed;

and compressing the files to be compressed according to the arrangement sequence corresponding to the files to be compressed to generate compressed files.

10. The snapshot delta acquisition method as claimed in claim 9, wherein said decompressing said target compressed file to obtain a target snapshot delta file comprises:

decompressing the target compressed file to obtain a plurality of decompressed files;

detecting the arrangement sequence of the decompressed files;

and sequencing the decompressed files according to the arrangement sequence of the decompressed files to obtain a target snapshot differential file.

11. A snapshot delta acquisition device, comprising:

the file compression module is used for compressing the snapshot difference quantity file to generate a compressed file;

the file storage module is used for storing the compressed file through a compressed file system;

the file calling module is used for acquiring a target compressed file from the compressed file system according to a file calling instruction when the file calling instruction is received;

the file decompression module is used for decompressing the target compressed file to obtain a target snapshot differential file;

wherein, the snapshot delta obtaining device further comprises:

the snapshot file detection module is used for detecting the snapshot file when the snapshot file is received so as to determine a file type corresponding to the snapshot file; generating a snapshot difference quantity file according to the file type and the snapshot file;

the delta file module is also used for judging whether the file type is a pointer snapshot or not; when the file type is a pointer snapshot, taking the snapshot file as a snapshot differential file;

the delta file module is further used for judging whether the file type is a mirror image snapshot or not when the file type is not a pointer snapshot; when the file type is a mirror image type snapshot, searching an original file corresponding to the snapshot file; and generating a snapshot difference file according to the snapshot file and the original file.

12. The snapshot delta acquisition device as recited in claim 11, wherein the file call module is further configured to determine target file information according to a file call instruction when receiving the file call instruction; determining a target file identifier according to the target file information; and acquiring a target compressed file from the compressed file system according to the target file identifier.

13. The snapshot delta acquisition device as recited in claim 12 wherein said file call module is further configured to match said target file identifier with a file identifier in a first mapping list; determining a target compressed file corresponding to the target file identifier according to the matching result; and searching a target file address corresponding to the target compressed file, and acquiring the target compressed file from the compressed file system according to the target file address.

14. The snapshot delta acquisition device as recited in claim 13, wherein the file calling module is further configured to allocate a file identifier for each compressed file, and establish a first mapping list according to the file identifier and the compressed file, where a corresponding relationship between the file identifier and the compressed file is recorded in the first mapping list.

15. The snapshot delta acquisition device as claimed in claim 14, wherein said file calling module is further configured to determine difference file information according to said target file information, and extract a target difference file name from said difference file information; matching the target differential file name with the differential file name in a second mapping list; and determining a target file identifier corresponding to the target difference file name according to the matching result.

16. A snapshot delta acquisition device, comprising: a memory, a processor, and a snapshot delta acquisition program stored on the memory and executable on the processor, the snapshot delta acquisition program configured with steps to implement the snapshot delta acquisition method of any of claims 1-10.

17. A storage medium having stored thereon a snapshot delta acquisition program which, when executed by a processor, implements the steps of the snapshot delta acquisition method as recited in any one of claims 1 to 10.

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