CN110888843A - Cross-host sparse file copying method, device, equipment and storage medium - Google Patents
Cross-host sparse file copying method, device, equipment and storage medium Download PDFInfo
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Abstract
The invention discloses a cross-host sparse file copying method, a cross-host sparse file copying device and a cross-host sparse file copying equipment and a computer storage medium.A source host reads metadata information of a target sparse file to be copied and then sends the metadata information to a target host, and the target host creates a sparse file to be filled by utilizing the metadata information; and the source host reads the target sparse file and sends the effective data and the offset information of the effective data determined in the reading process to the target host so that the target host reconstructs the corresponding sparse file in the sparse file to be filled by using the effective data and the offset information. Therefore, after the source host sends the effective data and the offset information of the sparse file to the target host, the target host can reconstruct the corresponding sparse file by using the effective data and the offset information, so that cross-host copy of the sparse file is realized; in addition, only effective data is copied when the sparse file is copied, and the file copying rate can be improved.
Description
Technical Field
The present invention relates to the field of data processing technologies, and in particular, to a cross-host sparse file copying method, apparatus, device, and computer storage medium.
Background
When a user applies for a storage space, data is not written into the space at first, and when the data is really written, the operating system gradually allocates the space. Then the file appears to be large but the actual footprint is small, the actual footprint being related only to the amount of data that the user fills. Such a file is a sparse file (sparse file). The places in the file that are not filled with data are called holes, i.e., holes. These holes, although not filled with data, will return a default value of 0 when the operating system accesses data at these locations. Currently, when a user copies a sparse file across hosts, the entire sparse file including invalid data is copied, that is: copying a sparse file across hosts will copy the hole part as well, which is equivalent to copying a pile of invalid data 0, resulting in a reduced copy rate when copying files across hosts.
Therefore, how to increase the copy rate of the cross-host sparse file is a problem to be solved by those skilled in the art.
Disclosure of Invention
The invention aims to provide a cross-host sparse file copying method, a cross-host sparse file copying device, cross-host sparse file copying equipment and a computer storage medium, so that the cross-host sparse file copying rate is improved.
In order to achieve the above object, the present invention provides a cross-host sparse file copying method, based on a source host, where the sparse file copying method includes:
reading metadata information of a target sparse file to be copied;
sending the metadata information to a target host, so that the target host creates a sparse file to be filled by using the metadata information;
and reading the target sparse file, and sending the effective data and the offset information of the effective data determined in the reading process to the target host, so that the target host reconstructs a corresponding sparse file in the sparse file to be filled by using the effective data and the offset information.
Before reading the metadata information of the target sparse file to be copied, the method further comprises the following steps:
judging whether the ratio of the void part of the target sparse file to the target sparse file is greater than a preset threshold value or not; and if so, continuing to execute the step of reading the metadata information of the target sparse file to be copied.
And the source host sends the metadata information, the effective data and the offset information of the effective data to the target host through a TCP protocol.
In order to achieve the above object, the present invention further provides a cross-host sparse file copying method, based on a target host, the sparse file copying method including:
acquiring metadata information of a target sparse file to be copied, which is sent by a source host;
creating a sparse file to be filled by utilizing the metadata information;
obtaining effective data and offset information of the effective data, which are sent by the source host and determined in the process of reading the target sparse file;
and reconstructing a corresponding sparse file in the sparse file to be filled by utilizing the effective data and the offset information.
And the source host sends the metadata information, the effective data and the offset information of the effective data to the target host through a TCP protocol.
In order to achieve the above object, the present invention further provides a cross-host sparse file copying apparatus, which includes, based on a source host:
the metadata reading module is used for reading metadata information of a target sparse file to be copied;
the metadata sending module is used for sending the metadata information to a target host so that the target host can create a sparse file to be filled by using the metadata information;
the file reading module is used for reading the target sparse file;
and the data sending module is used for sending the effective data and the offset information of the effective data determined in the reading process to the target host so that the target host can reconstruct a corresponding sparse file in the sparse file to be filled by using the effective data and the offset information.
Wherein, this scheme still includes:
the judging module is used for judging whether the ratio of the cavity part of the target sparse file to the target sparse file is greater than a preset threshold value or not;
and the metadata reading module is used for reading the metadata information of the target sparse file to be copied when the ratio of the void part of the target sparse file to the target sparse file is greater than a preset threshold value.
In order to achieve the above object, the present invention further provides a cross-host sparse file copying apparatus, based on a destination host, the sparse file copying apparatus comprising:
the metadata acquisition module is used for acquiring metadata information of a target sparse file to be copied, which is sent by a source host;
the file creating module is used for creating a sparse file to be filled by utilizing the metadata information;
the data acquisition module is used for acquiring effective data and offset information of the effective data, which are sent by the source host and determined in the process of reading the target sparse file;
and the file reconstruction module is used for reconstructing a corresponding sparse file in the sparse file to be filled by utilizing the effective data and the offset information.
To achieve the above object, the present invention further provides a cross-host sparse file copying apparatus, including: a memory for storing a computer program; and the processor is used for realizing the steps of the sparse file copying method based on the source host or realizing the steps of the sparse file copying method based on the destination host when executing the computer program.
To achieve the above object, the present invention further provides a computer-readable storage medium, which stores thereon a computer program, which, when being executed by a processor, implements the steps of the above-mentioned sparse file copy method based on a source host or implements the steps of the above-mentioned sparse file copy method based on a destination host.
According to the scheme, the cross-host sparse file copying method, the cross-host sparse file copying device, the cross-host sparse file copying equipment and the computer storage medium are provided, in the scheme, a source host reads metadata information of a target sparse file to be copied and then sends the metadata information to a target host, and the target host creates a sparse file to be filled by using the metadata information; and the source host reads the target sparse file and sends the effective data and the offset information of the effective data determined in the reading process to the target host so that the target host reconstructs the corresponding sparse file in the sparse file to be filled by using the effective data and the offset information. Therefore, after the source host sends the effective data and the offset information of the sparse file to the target host, the target host can reconstruct the corresponding sparse file by using the effective data and the offset information, so that cross-host copy of the sparse file is realized; in addition, only effective data is copied when the sparse file is copied, and the file copying rate can be improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic flowchart of a sparse file copying method based on a source host according to an embodiment of the present invention;
FIG. 2 is a schematic flowchart of a sparse file copy method based on a destination host according to an embodiment of the present invention;
FIG. 3 is a schematic structural diagram of a sparse file copying apparatus based on a source host according to an embodiment of the present invention;
FIG. 4 is a schematic structural diagram of a destination host-based sparse file copying apparatus according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of a sparse file copying apparatus according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The embodiment of the invention discloses a cross-host sparse file copying method, a cross-host sparse file copying device, cross-host sparse file copying equipment and a computer storage medium, and aims to improve the copying rate of cross-host sparse files.
Referring to fig. 1, an embodiment of the present invention provides a cross-host sparse file copying method, where based on a source host, the sparse file copying method includes:
s101, reading metadata information of a target sparse file to be copied;
it should be noted that the target sparse file is a file to be copied across hosts, the host where the target sparse file is located is a source host, and the target host is a host to which the target sparse file is to be copied; in the application, a Server process can be started at a source host, a Client process can be started at a destination host, and metadata information of a target sparse file is read through the Server process of the source host, wherein the metadata information comprises information such as name, size and authority of the sparse file.
S102, sending the metadata information to a target host to enable the target host to create a sparse file to be filled by utilizing the metadata information;
specifically, after a Server process in the application acquires metadata information of a target sparse file, the Server process sends the metadata information to a target host, the Client process of the target host receives the metadata information sent by the Server process, after the metadata information of the target sparse file is received, the target host creates a homonymous file to a specified position according to information such as names in the metadata, and the created homonymous file is the sparse file to be filled. The Client process of the target host can continuously receive the sparse file and the offset information sent by the source host, so that the sparse file can be reconstructed in the sparse file to be filled.
S103, reading the target sparse file, and sending the effective data and the offset information of the effective data determined in the reading process to the target host, so that the target host reconstructs a corresponding sparse file in the sparse file to be filled by using the effective data and the offset information.
And the source host sends the metadata information, the effective data and the offset information of the effective data to the target host through a TCP protocol.
It should be noted that, in the present application, a bridge is established between the source host and the destination host based on a TCP (Transmission Control Protocol) Protocol. Metadata information, effective data and offset information of the target sparse file read by the Server process are all sent to the Client process based on the TCP, and the Client process builds the sparse file on the target host again after taking the information. Therefore, the aim of cross-host copying of the sparse file based on tcp is achieved.
In this embodiment, when the Server process reads the sparse file, a certain amount of data is read each time, and then whether all the data are 0 is judged, if so, the part can be considered as a file hole, and the Server process sends the result to the Client process; and if the data is not completely 0, the data is considered to be valid data, and the Server process sends the valid data to the Client. For example: when reading data, 4k or other data with different sizes can be read each time, and whether all the read data are 0 is judged; if yes, continuing to read downwards until effective data is read, and recording offset information of the effective data; the Server process continues to read a certain amount of data until 0 is read, and the read effective data and offset information corresponding to the effective data are sent to the Client process through the TCP; in this way, the Server process of the source host can send all valid data in the target sparse file and offset information corresponding to the valid data to the Client process through the TCP. Thus, the Server process sends the completion signal until the file reading is completed, and the transmission process is finished.
And when the Client process receives the file metadata information, a new sparse file with the same size is created at a specified position, when the Client process receives the effective data and the offset information, the newly created sparse file to be filled is opened, the corresponding offset is moved, and then the effective data is written to the corresponding position. And repeating the steps until the data transmission is finished, receiving an end signal by the Client process, and ending the receiving process.
In summary, the method for initiating the Server process at the source host and initiating the Client process at the destination host transfers information between the Server and the Client based on the TCP protocol. The Server process reads the sparse file to determine the effective part of the file, and sends the result to the Client process based on the TCP. After the Client process takes the information, constructing a sparse file on the target host again based on the information; if the hole exists, skipping; and if the data is valid data, writing the data to the corresponding position of the file. Therefore, the aim of cross-host copying of the sparse file based on tcp is achieved, and effective transmission of the sparse file is achieved.
Based on the foregoing embodiment, in this embodiment, before reading the metadata information of the target sparse file to be copied, the method further includes:
judging whether the ratio of the void part of the target sparse file to the target sparse file is greater than a preset threshold value or not; and if so, continuing to read the metadata information of the target sparse file to be copied.
It should be noted that, when the scheme is used for reading a sparse file, the valid portion and the invalid portion of the sparse file and the offset information of the valid portion need to be determined, the process needs to occupy system processing resources, and for a sparse file with less invalid portions, even if the sparse file is read in a conventional manner, the system resources consumed for reading invalid data are less.
Therefore, in the application, in order to save system resources, before reading the metadata information of the target sparse file to be copied, whether the ratio of the void part of the target sparse file to the target sparse file is greater than a predetermined threshold value or not can be judged; if the ratio of the hole part of the target sparse file to the target sparse file is not greater than the predetermined threshold, the hole part is less, and at this time, excessive resources are not consumed even if direct copying is performed, and the target sparse file can be directly copied. By the method, system resources can be saved when the hole part is less, and file transmission efficiency is improved.
Referring to fig. 2, the cross-host sparse file copy method provided in the embodiment of the present invention is based on a target host; it should be noted that the destination-host-based sparse file copy method described in this embodiment may be referred to as the source-host-based sparse file copy method, and the two methods are only different in implementation subject. Specifically, the sparse file copy method in this embodiment includes:
s201, acquiring metadata information of a target sparse file to be copied, which is sent by a source host;
s202, creating a sparse file to be filled by utilizing the metadata information;
s203, obtaining effective data and offset information of the effective data which are sent by the source host and determined in the process of reading the target sparse file;
and S204, reconstructing a corresponding sparse file in the sparse file to be filled by utilizing the effective data and the offset information.
And the source host sends the metadata information, the effective data and the offset information of the effective data to the target host through a TCP protocol.
In summary, after the source host sends the effective data and the offset information of the sparse file to the destination host, the destination host can reconstruct the corresponding sparse file by using the effective data and the offset information, thereby realizing cross-host copy of the sparse file; in addition, only effective data is copied when the sparse file is copied, and the file copying rate can be improved.
In the following, the sparse file copying apparatus based on the source host provided by the embodiment of the present invention is introduced, and the sparse file copying apparatus described below and the sparse file copying method based on the source host described above may be referred to each other.
Referring to fig. 3, in an embodiment of the present invention, a cross-host sparse file copying apparatus 100 is provided, where based on a source host, the sparse file copying apparatus 100 includes:
the metadata reading module 101 is configured to read metadata information of a target sparse file to be copied;
a metadata sending module 102, configured to send the metadata information to a destination host, so that the destination host creates a to-be-filled sparse file by using the metadata information;
the file reading module 103 is used for reading the target sparse file;
the data sending module 104 is configured to send the valid data and the offset information of the valid data determined in the reading process to the target host, so that the target host reconstructs a corresponding sparse file in the to-be-filled sparse file by using the valid data and the offset information.
Wherein, this scheme still includes:
the judging module is used for judging whether the ratio of the cavity part of the target sparse file to the target sparse file is greater than a preset threshold value or not;
and the metadata reading module is used for reading the metadata information of the target sparse file to be copied when the ratio of the void part of the target sparse file to the target sparse file is greater than a preset threshold value.
And the source host sends the metadata information, the effective data and the offset information of the effective data to the target host through a TCP protocol.
Referring to fig. 4, an embodiment of the present invention provides a cross-host sparse file copying apparatus 200, where, based on a destination host, the sparse file copying apparatus 200 includes:
a metadata obtaining module 201, configured to obtain metadata information of a target sparse file to be copied, where the metadata information is sent by a source host;
a file creating module 202, configured to create a sparse file to be filled by using the metadata information;
a data obtaining module 203, configured to obtain valid data and offset information of the valid data, which are sent by the source host and determined in the process of reading the target sparse file;
and a file reconstruction module 204, configured to reconstruct a corresponding sparse file in the sparse file to be filled by using the valid data and the offset information.
And the source host sends the metadata information, the effective data and the offset information of the effective data to the target host through a TCP protocol.
Referring to fig. 5, an embodiment of the present invention further discloses a cross-host sparse file copying apparatus, including:
a memory 11 for storing a computer program;
and a processor 12, configured to implement the steps of the sparse file copy method based on the source host or implement the steps of the sparse file copy method based on the destination host when executing the computer program.
In this embodiment, the device may be a PC (Personal Computer), or may be a terminal device such as a smart phone, a tablet Computer, a palmtop Computer, or a portable Computer.
The device may include a memory 11, a processor 12, and a bus 13.
The memory 11 includes at least one type of readable storage medium, which includes a flash memory, a hard disk, a multimedia card, a card type memory (e.g., SD or DX memory, etc.), a magnetic memory, a magnetic disk, an optical disk, and the like. The memory 11 may in some embodiments be an internal storage unit of the device, for example a hard disk of the device. The memory 11 may also be an external storage device of the device in other embodiments, such as a plug-in hard disk provided on the device, a Smart Memory Card (SMC), a Secure Digital (SD) Card, a Flash memory Card (Flash Card), and the like. Further, the memory 11 may also include both an internal storage unit of the device and an external storage device. The memory 11 may be used not only to store application software installed in the device and various types of data such as code that performs a sparse file copy method, etc., but also to temporarily store data that has been output or is to be output.
The processor 12, which in some embodiments may be a Central Processing Unit (CPU), controller, microcontroller, microprocessor or other data Processing chip, is configured to run program code stored in the memory 11 or to process data, such as code that performs a sparse file copy method, etc.
The bus 13 may be a Peripheral Component Interconnect (PCI) bus, an Extended Industry Standard Architecture (EISA) bus, or the like. The bus may be divided into an address bus, a data bus, a control bus, etc. For ease of illustration, only one thick line is shown in FIG. 5, but this is not intended to represent only one bus or type of bus.
Further, the device may further include a network interface 14, and the network interface 14 may optionally include a wired interface and/or a wireless interface (e.g., WI-FI interface, bluetooth interface, etc.), which are generally used to establish a communication connection between the device and other electronic devices.
Optionally, the device may further comprise a user interface, which may comprise a Display (Display), an input unit such as a Keyboard (Keyboard), and optionally a standard wired interface, a wireless interface. Alternatively, in some embodiments, the display may be an LED display, a liquid crystal display, a touch-sensitive liquid crystal display, an OLED (Organic Light-Emitting Diode) touch device, or the like. The display, which may also be referred to as a display screen or display unit, is suitable for displaying information processed in the device and for displaying a visualized user interface.
Fig. 5 is shown with only components 11-14, and those skilled in the art will appreciate that the configuration shown in fig. 5 does not constitute a limitation of the apparatus, and may include fewer or more components than those shown, or some components may be combined, or a different arrangement of components.
The embodiment of the invention also discloses a computer readable storage medium, wherein a computer program is stored on the computer readable storage medium, and when the computer program is executed by a processor, the steps of the sparse file copying method based on the source host or the steps of the sparse file copying method based on the target host are realized.
Wherein the storage medium may include: various media capable of storing program codes, such as a usb disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk, or an optical disk.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. A cross-host sparse file copy method is characterized in that based on a source host, the sparse file copy comprises the following steps:
reading metadata information of a target sparse file to be copied;
sending the metadata information to a target host, so that the target host creates a sparse file to be filled by using the metadata information;
and reading the target sparse file, and sending the effective data and the offset information of the effective data determined in the reading process to the target host, so that the target host reconstructs a corresponding sparse file in the sparse file to be filled by using the effective data and the offset information.
2. The sparse file copying method according to claim 1, wherein before reading the metadata information of the target sparse file to be copied, the method further comprises:
judging whether the ratio of the void part of the target sparse file to the target sparse file is greater than a preset threshold value or not; and if so, continuing to execute the step of reading the metadata information of the target sparse file to be copied.
3. The sparse file copy method of claim 2, wherein the source host sends metadata information, valid data, and offset information of the valid data to the target host via a TCP protocol.
4. A cross-host sparse file copying method is characterized in that based on a destination host, the sparse file copying method comprises the following steps:
acquiring metadata information of a target sparse file to be copied, which is sent by a source host;
creating a sparse file to be filled by utilizing the metadata information;
obtaining effective data and offset information of the effective data, which are sent by the source host and determined in the process of reading the target sparse file;
and reconstructing a corresponding sparse file in the sparse file to be filled by utilizing the effective data and the offset information.
5. The sparse file copy method of claim 4, wherein the source host sends metadata information, valid data, and offset information of valid data to the target host via a TCP protocol.
6. A cross-host sparse file copying apparatus, based on a source host, the sparse file copying apparatus comprising:
the metadata reading module is used for reading metadata information of a target sparse file to be copied;
the metadata sending module is used for sending the metadata information to a target host so that the target host can create a sparse file to be filled by using the metadata information;
the file reading module is used for reading the target sparse file;
and the data sending module is used for sending the effective data and the offset information of the effective data determined in the reading process to the target host so that the target host can reconstruct a corresponding sparse file in the sparse file to be filled by using the effective data and the offset information.
7. The sparse file copying apparatus of claim 6, further comprising:
the judging module is used for judging whether the ratio of the cavity part of the target sparse file to the target sparse file is greater than a preset threshold value or not;
and the metadata reading module is used for reading the metadata information of the target sparse file to be copied when the ratio of the void part of the target sparse file to the target sparse file is greater than a preset threshold value.
8. A cross-host sparse file copying apparatus, wherein based on a destination host, the sparse file copying apparatus comprises:
the metadata acquisition module is used for acquiring metadata information of a target sparse file to be copied, which is sent by a source host;
the file creating module is used for creating a sparse file to be filled by utilizing the metadata information;
the data acquisition module is used for acquiring effective data and offset information of the effective data, which are sent by the source host and determined in the process of reading the target sparse file;
and the file reconstruction module is used for reconstructing a corresponding sparse file in the sparse file to be filled by utilizing the effective data and the offset information.
9. A cross-host sparse file copy apparatus, comprising:
a memory for storing a computer program;
a processor for implementing the steps of the source host-based sparse file copy method of any one of claims 1 to 3 or the steps of the destination host-based sparse file copy method of claim 4 or 5 when executing said computer program.
10. A computer-readable storage medium, having stored thereon a computer program which, when executed by a processor, performs the steps of the source host-based sparse file copy method of any one of claims 1 to 3 or the steps of the destination host-based sparse file copy method of claim 4 or 5.
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| CN112000277A (en) * | 2020-07-17 | 2020-11-27 | 苏州浪潮智能科技有限公司 | Method, device and equipment for copying simplified backup file and readable storage medium |
| CN113342471A (en) * | 2021-06-25 | 2021-09-03 | 航天云网科技发展有限责任公司 | Virtual machine migration method and system and electronic equipment |
| CN114866537A (en) * | 2022-05-31 | 2022-08-05 | 山东省计算中心（国家超级计算济南中心） | Cross-host and cross-network file transmission method and system |
| US11558448B1 (en) | 2021-09-22 | 2023-01-17 | International Business Machines Corporation | Sparse information sharing system |
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