CN114637702A - Metadata loss prevention method and device, readable storage medium and electronic equipment - Google Patents
Metadata loss prevention method and device, readable storage medium and electronic equipment Download PDFInfo
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- CN114637702A CN114637702A CN202210151916.1A CN202210151916A CN114637702A CN 114637702 A CN114637702 A CN 114637702A CN 202210151916 A CN202210151916 A CN 202210151916A CN 114637702 A CN114637702 A CN 114637702A
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F12/00—Accessing, addressing or allocating within memory systems or architectures
- G06F12/16—Protection against loss of memory contents
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/06—Digital input from, or digital output to, record carriers, e.g. RAID, emulated record carriers or networked record carriers
- G06F3/0601—Interfaces specially adapted for storage systems
- G06F3/0602—Interfaces specially adapted for storage systems specifically adapted to achieve a particular effect
- G06F3/0614—Improving the reliability of storage systems
- G06F3/0619—Improving the reliability of storage systems in relation to data integrity, e.g. data losses, bit errors
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- G06—COMPUTING; CALCULATING OR COUNTING
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- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/06—Digital input from, or digital output to, record carriers, e.g. RAID, emulated record carriers or networked record carriers
- G06F3/0601—Interfaces specially adapted for storage systems
- G06F3/0628—Interfaces specially adapted for storage systems making use of a particular technique
- G06F3/0638—Organizing or formatting or addressing of data
- G06F3/064—Management of blocks
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/06—Digital input from, or digital output to, record carriers, e.g. RAID, emulated record carriers or networked record carriers
- G06F3/0601—Interfaces specially adapted for storage systems
- G06F3/0628—Interfaces specially adapted for storage systems making use of a particular technique
- G06F3/0646—Horizontal data movement in storage systems, i.e. moving data in between storage devices or systems
- G06F3/0652—Erasing, e.g. deleting, data cleaning, moving of data to a wastebasket
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Abstract
The invention discloses a metadata loss prevention method, a device, a readable storage medium and electronic equipment.A metadata writing instruction is obtained through a system, corresponding metadata is written into a target data block according to the metadata writing instruction, when the situation that the metadata in the target data block is not completely stored is detected, the target data block in which the metadata is stored is erased, a new target data block is obtained again to be used for storing the metadata, and the integrity detection of the metadata is carried out again until the metadata is completely stored by the data block, so that the metadata written into the data block is all complete metadata, the loss of the metadata is avoided, the integrity of the metadata storage is improved, and the risk of the metadata loss is reduced.
Description
Technical Field
The present invention relates to the field of storage devices, and in particular, to a method and an apparatus for preventing metadata from being lost, a readable storage medium, and an electronic device.
Background
In the development of an EMMC (Embedded Multi Media Card) firmware, metadata is key data to record and guarantee the normal operation of the whole firmware. But the storage of the metadata is a simpler storage process at present. The integrity and correctness of the metadata when it is saved cannot be ensured. Moreover, when the stored metadata is abnormal, the abnormal metadata cannot be processed or repaired in time. Therefore, the loss of the metadata cannot be effectively avoided, so that the EMMC firmware cannot effectively store the complete metadata, and the stability of the EMMC firmware in the using and developing processes is not high.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: provided are a metadata loss prevention method, a metadata loss prevention device, a readable storage medium and an electronic device, which improve the integrity of metadata storage and reduce the risk of metadata loss.
In order to solve the technical problems, the invention adopts the technical scheme that:
a metadata loss prevention method comprises the following steps:
acquiring a metadata writing instruction;
sequentially traversing all data blocks in the system, and writing the metadata into a target data block according to the metadata writing instruction when the target data block is traversed;
judging whether the metadata are correct or not, if not, erasing the metadata in the target data block, and continuously traversing; and if so, exiting the traversal.
In order to solve the technical problem, the invention adopts another technical scheme as follows:
a metadata loss prevention apparatus comprising:
the acquisition module is used for acquiring a metadata writing instruction;
the traversal module is used for sequentially traversing all data blocks in the system, and writing the metadata into a target data block according to the metadata writing instruction when the target data block is traversed;
the judging module is used for judging whether the metadata is correct or not, if not, the metadata in the target data block is erased, and traversal is continued; and if so, exiting the traversal.
In order to solve the technical problem, the invention adopts another technical scheme as follows:
a computer-readable storage medium, on which a computer program is stored which, when being executed by a processor, carries out the steps of a method for metadata protection against loss as described above.
In order to solve the technical problem, the invention adopts another technical scheme as follows:
an electronic device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, the processor implementing the steps of a metadata anti-loss method as described above when executing the computer program.
The invention has the beneficial effects that: after a metadata writing instruction is obtained through a system, corresponding metadata is written into a target data block according to the metadata writing instruction, when the situation that the metadata in the target data block is not completely stored is detected, the target data block stored with the metadata is erased, a new target data block is obtained again to be used for storing the metadata, and integrity detection of the metadata is carried out again until the metadata is completely stored by the data block, so that the metadata written into the data block is all complete metadata, loss of the metadata is avoided, integrity of metadata storage is improved, and risk of metadata loss is reduced.
Drawings
FIG. 1 is a flowchart illustrating steps of a method for preventing metadata from being lost according to an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of a metadata loss prevention apparatus according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of an electronic device according to an embodiment of the present invention;
fig. 4 is a flowchart illustrating another step of a metadata loss prevention method according to an embodiment of the present invention.
Detailed Description
In order to explain technical contents, achieved objects, and effects of the present invention in detail, the following description is made with reference to the accompanying drawings in combination with the embodiments.
Referring to fig. 1, a method for preventing metadata from being lost includes the steps of:
acquiring a metadata writing instruction;
sequentially traversing all data blocks in the system, and writing the metadata into a target data block according to the metadata writing instruction when the target data block is traversed;
judging whether the metadata is correct or not, if not, erasing the metadata in the target data block, and continuously traversing; and if so, exiting the traversal.
As can be seen from the above description, the beneficial effects of the present invention are: after a metadata writing instruction is obtained through a system, corresponding metadata is written into a target data block according to the metadata writing instruction, when the fact that metadata in the target data block are not completely stored is detected, the target data block in which the metadata are stored is erased, a new target data block is obtained again to be used for storing the metadata, integrity detection of the metadata is carried out again until the metadata are completely stored by the data block, and therefore the metadata written into the data block are all complete metadata, loss of the metadata is avoided, integrity of metadata storage is improved, and the risk of metadata loss is reduced.
Further, the data blocks are stored in the system in an array form;
the writing the metadata into the target data block according to the metadata write instruction further comprises:
acquiring an array subscript corresponding to the target data block;
and judging whether the traversal of all the data blocks is finished or not according to the array subscript.
According to the description, the data blocks are stored in the system in the form of arrays, so that the data blocks are more convenient to obtain, and the array subscripts corresponding to the target data blocks are obtained when the metadata are written into the target data blocks, so that whether the traversal of all the data blocks is finished or not can be conveniently judged through the array subscripts corresponding to the target data blocks, the traversal efficiency is improved, and the accuracy of determining the traversal process is also improved.
Further, the determining whether the traversal of all the data blocks is completed according to the array subscript includes:
acquiring an array subscript corresponding to a target data block with incomplete first written metadata to obtain a first block subscript value;
when the metadata written in the traversed target data block is incomplete, after the metadata in the target data block is erased, the array subscript corresponding to the target data block is recorded, and a second block subscript value is obtained;
and judging whether the first block index value is the same as the second block index value, if so, completing traversal of all the data blocks.
According to the above description, in the process of traversing the data blocks, the metadata in the target data block in which the metadata storage fails for the first time is erased, the corresponding array subscript of the target data block is recorded as the first block subscript value, the array subscript of the target data block in the subsequent traversing process is used as the second block subscript value, and the first block subscript value and the second block subscript value are compared, so that whether all the data blocks in the system are traversed or not can be quickly judged.
Further, still include:
and when the metadata written in the traversed target data block is complete, restoring the first block index value to a default value.
According to the above description, after the metadata is completely stored by the target data block, the first block scalar value is restored to the default value, and the first block scalar value is recorded again until the target data block is traversed again and the metadata is incomplete, so that whether the metadata which is not completely stored exists can be further judged by judging whether the first block scalar value is the default value, the specific processing is realized, and the integrity of metadata storage is improved.
Further, the determining whether to complete traversing all data blocks according to the array subscript includes:
and performing low formatting on all the target data blocks in the system.
It can be known from the above description that, when all data blocks in the system are traversed and metadata still cannot be completely and correctly stored in the data blocks, all data blocks in the system are subjected to low formatting, and all data blocks are reset, so that the data blocks after low formatting can be reused, and the system stability is improved.
Further, before the determining whether the metadata is correct, the method further includes:
and judging whether an old data block storing the metadata exists in the system or not, if so, erasing the old data block, and reserving the target data block currently storing the metadata.
As can be seen from the above description, by determining whether different data blocks storing the same metadata block exist in the system, and erasing the metadata in the old data block storing the metadata, the occurrence of system abnormality and the like is avoided.
Further, the metadata write instruction includes a write address and write data volume information;
the writing the metadata into the target data block according to the metadata write instruction comprises:
and writing the metadata into the target data block according to the writing address and the writing data volume information.
As can be seen from the above description, the metadata is written into the target data block through the write address and the write data size information included in the write instruction, so that the metadata can be accurately written into the corresponding data block, and meanwhile, the integrity of the metadata can also be judged through the data size and other information in the subsequent metadata integrity judgment process, so that the correctness of the metadata is enhanced and the incompleteness of the metadata is reduced.
Referring to fig. 2, another embodiment of the present invention provides a metadata loss prevention apparatus, including:
the acquisition module is used for acquiring a metadata writing instruction;
the traversal module is used for sequentially traversing all data blocks in the system, and writing the metadata into a target data block according to the metadata writing instruction when the target data block is traversed;
the judging module is used for judging whether the metadata is correct or not, if not, the metadata in the target data block is erased, and traversal is continued; and if so, exiting the traversal.
Another embodiment of the present invention provides a computer-readable storage medium having stored thereon a computer program which, when executed by a processor, performs the steps of a method for metadata loss prevention as described above.
Referring to fig. 3, another embodiment of the present invention provides an electronic device, which includes a memory, a processor, and a computer program stored in the memory and executable on the processor, where the processor executes the computer program to implement the steps of a metadata loss prevention method as described above.
The above-mentioned metadata loss prevention method, apparatus, computer-readable storage medium and electronic device of the present invention can be applied to metadata storage of various types of storage devices, and particularly, for metadata storage of an EMMC storage device, the following description is made by specific embodiments:
referring to fig. 1 and 4, a metadata loss prevention method includes the steps of:
s1, acquiring a metadata writing instruction; the metadata writing instruction comprises information such as a writing address and a writing data volume;
s2, sequentially traversing all data blocks in the system, and writing the metadata into the target data block according to the metadata writing instruction when the target data block is traversed; specifically, the metadata is written into the target data block according to the address corresponding to the write instruction; the traversal refers to finding a data block by means of the subscript +1 to realize the traversal function on the EMMC, and the EMMC does not have the traversal function;
s3, judging whether an old data block storing the metadata already exists in the system, if so, erasing the old data block, and keeping the target data block currently storing the metadata.
S4, judging whether the metadata is correct or not, if not, erasing the metadata in the target data block, and continuously traversing; if yes, exiting traversal;
the data blocks are stored in the system in an array form, the required number of the data blocks is calculated according to the size and the service life of the total capacity, and a data block group is formed; when the metadata is written into the data block in S2, writing the metadata into the target data block according to the write address and the write data amount information, and simultaneously writing the array subscript corresponding to the target data block into the target data block; after the metadata is written and stored, judging whether the metadata is correct or not through a read-back operation; when the metadata is found to be incorrect data through checking, integrity checking is carried out on the metadata; judging whether traversing of all data blocks is finished or not according to the array subscript;
in step S2, it is determined whether traversal of all data blocks is completed according to the array subscript as follows:
s21, obtaining an array subscript corresponding to the first written target data block with incomplete metadata to obtain a first block subscript value; if the index of the array corresponding to the current target data block is 8, the metadata in the data block before the target data block is completely written after the metadata is written in the target data block, and the metadata is incomplete after the metadata is written in the target data block, the target data block is the first target data block in which the written metadata is incomplete, and the index value a of the first block of the current block is recorded as 8;
s22, when the metadata written in the traversed target data block is incomplete, after the metadata in the target data block is erased, the array subscript corresponding to the target data block is recorded, and a second block subscript value is obtained; if the array subscript corresponding to the target data block traversed currently is 9, recording the second block subscript value B of the current block as 9, and if the array subscript corresponding to the target data block traversed currently is 11, recording the second block subscript value B of the current block as 11;
or when the metadata written in the traversed target data block is complete, restoring the first block index value to a default value, and only recording the second block index value; if the first block index value is restored to the default value of 0xFF, the current target data block successfully saves the metadata;
s33, judging whether the first block index value is the same as the second block index value, if so, completing traversal of all data blocks; if the first block index value a is 8 and the second block index value B is 9/11, the current first block index value is not equal to the second block index value, which indicates that the traversal of all data blocks is not completed; for another example, when the first block index value a is 8 and the second block index value B is 8, the current first block index value is equal to the second block index value, which indicates that all data blocks have completed traversal;
in an optional embodiment, step S33 is followed by step S34 of performing a low-format process on all the target data blocks in the system; the low-level formatting comprises low-level formatting and mass production processes; all data blocks in the system are subjected to low formatting, all the data blocks are reset, and normal operation of system firmware is guaranteed, so that the data blocks subjected to low formatting can be reused, and the stability of the system is improved.
Example two
Referring to fig. 2, a metadata loss prevention apparatus includes:
the acquisition module is used for acquiring a metadata writing instruction;
the traversal module is used for sequentially traversing all data blocks in the system, and writing the metadata into a target data block according to the metadata writing instruction when the target data block is traversed;
the judging module is used for erasing the metadata in the target data block and continuously traversing if the metadata is not erased; and if so, exiting the traversal.
EXAMPLE III
A computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, carries out the steps of a method for metadata protection against loss according to an embodiment one.
Example four
Referring to fig. 3, an electronic device includes a memory, a processor, and a computer program stored in the memory and executable on the processor, where the processor executes the computer program to implement the steps of a metadata loss prevention method according to an embodiment.
In summary, according to the metadata loss prevention method, apparatus, readable storage medium and electronic device provided by the present invention, after a metadata write-in instruction is obtained through a system, corresponding metadata is written into a target data block according to the metadata write-in instruction, then whether a data block storing the same metadata exists is checked, if yes, an old data block is erased, and further whether currently stored metadata is correct is further determined, if not, whether the metadata is completely stored is detected, when it is detected that metadata in the target data block is not completely stored, the target data block storing the metadata is erased, a new target data block is obtained again for storing the metadata, and integrity detection of the metadata is performed again until the metadata is completely stored by the data block, thereby ensuring that the metadata written into the data block is complete metadata, the loss of metadata is avoided, the completeness of metadata storage is improved, and the risk of metadata loss is reduced; and when all the data blocks can not completely store the metadata, the data blocks in the system are subjected to low formatting, so that the firmware can normally run after the low formatting.
In the above embodiments provided in the present application, it should be understood that the disclosed method, apparatus, computer-readable storage medium, and electronic device may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the modules is only one logical division, and other divisions may be realized in practice, for example, a plurality of components or modules may be combined or integrated into another apparatus, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or components or modules, and may be in an electrical, mechanical or other form.
The components described as separate parts may or may not be physically separate, and parts displayed as components may or may not be physical modules, may be located in one place, or may be distributed on a plurality of network modules. Some or all of the components can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional modules in the embodiments of the present invention may be integrated into one processing module, or each component may exist alone physically, or two or more modules are integrated into one module. The integrated module can be realized in a hardware mode, and can also be realized in a software functional module mode.
The integrated module, if implemented in the form of a software functional module and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
It should be noted that, for the sake of simplicity, the above-mentioned method embodiments are described as a series of acts or combinations, but those skilled in the art should understand that the present invention is not limited by the described order of acts, as some steps may be performed in other orders or simultaneously according to the present invention. Further, those skilled in the art will appreciate that the embodiments described in the specification are presently preferred and that no acts or modules are necessarily required of the invention.
In the above embodiments, the descriptions of the respective embodiments have respective emphasis, and for parts that are not described in detail in a certain embodiment, reference may be made to related descriptions of other embodiments.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all equivalent changes made by using the contents of the present specification and the drawings, or applied directly or indirectly to the related technical fields, are included in the scope of the present invention.
Claims (10)
1. A method for preventing metadata loss, comprising the steps of:
acquiring a metadata writing instruction;
sequentially traversing all data blocks in the system, and writing the metadata into a target data block according to the metadata writing instruction when the target data block is traversed;
judging whether the metadata is correct or not, if not, erasing the metadata in the target data block, and continuously traversing; and if so, exiting the traversal.
2. The method of claim 1, wherein the data blocks are stored in an array in the system;
the writing the metadata into the target data block according to the metadata write instruction further comprises:
acquiring an array subscript corresponding to the target data block;
and judging whether the traversal of all the data blocks is finished or not according to the array subscript.
3. The method of claim 2, wherein the determining whether to complete traversal of all data blocks according to the array subscript comprises:
acquiring an array subscript corresponding to a target data block with incomplete first written metadata to obtain a first block subscript value;
when the metadata written in the traversed target data block is incorrect, after the metadata in the target data block is erased, the array subscript corresponding to the target data block is recorded to obtain a second block subscript value;
if the metadata written in the target data block is correct, recording the array subscript corresponding to the target data block to obtain a second block numerical value;
and judging whether the first block index value is the same as the second block index value, if so, completing traversal of all the data blocks.
4. The metadata loss prevention method according to claim 3, further comprising:
and when the metadata written in the traversed target data block is correct, restoring the first block index value to a default value.
5. The method of claim 3, wherein the determining whether to complete the traversal of all the data blocks according to the array subscript comprises:
and if all traversals are completed, performing low formatting on all the target data blocks in the system.
6. The method of claim 1, wherein said determining whether the metadata is correct further comprises:
and judging whether an old data block storing the metadata exists in the system or not, if so, erasing the old data block, and reserving the target data block currently storing the metadata.
7. The metadata loss prevention method according to claim 1, wherein the metadata write command includes a write address and write data volume information;
the writing the metadata into the target data block according to the metadata write instruction comprises:
and writing the metadata into the target data block according to the writing address and the writing data volume information.
8. A metadata loss prevention apparatus, comprising:
the acquisition module is used for acquiring a metadata writing instruction;
the traversal module is used for sequentially traversing all data blocks in the system, and writing the metadata into a target data block according to the metadata writing instruction when the target data block is traversed; judging whether the metadata is correct or not, if not, erasing the metadata in the target data block, and continuously traversing; and if so, exiting the traversal.
9. A computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, carries out the steps of a method for metadata protection against loss as claimed in any one of claims 1 to 7.
10. An electronic device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, wherein the processor implements the steps of a method for metadata loss prevention as claimed in any one of claims 1 to 7 when executing the computer program.
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