CN112433959B - Method, device, computer storage medium and terminal for realizing data storage processing - Google Patents

Abstract

The embodiment of the invention takes a storage page which is finally written into a block in which data is written when a NAND flash memory is abnormally powered down as a reference page, and after the storage page influenced by the abnormal power down is determined, the data storage processing is carried out on the storage page influenced by the abnormal power down, so that the influence of the abnormal power down on data storage is reduced.

Description

Method, device, computer storage medium and terminal for realizing data storage processing

Technical Field

This article relates to but is not limited to data storage technology, and in particular to a method, device, computer storage medium and terminal for implementing data storage processing.

Background Art

NAND flash memory is based on floating gate storage technology. There is a floating gate between the gate (control gate) and the drain. Nand Flash can perform erase discharge and program charge operations. Data is stored in Nand Flash in the form of charge. The gate and the motherboard are insulated with an oxide film, so the charge can be maintained for a long time and data can still be stored when there is no power.

If a block in Nand Flash loses power when performing a write operation, the block will become extremely unstable. The storage page written before the abnormal power failure and the data written in the subsequent storage page compilation are prone to error checking and correction (ECC) failure when reading, resulting in data loss. The related technology will perform a retry read operation when ECC Fail occurs, but ECC Fail will still occur, affecting users' use of Nand Flash for data storage. In order to avoid the impact of abnormal power failure on data storage, some technicians stop writing to the block when the abnormal power failure occurs. Although this can avoid data loss caused by writing data in subsequent storage pages, it affects the application of storage resources.

How to reduce the impact of abnormal power failure on data storage has become a problem to be solved.

Summary of the invention

The following is a summary of the subject matter described in detail herein. This summary is not intended to limit the scope of the claims.

The embodiments of the present invention provide a method, an apparatus, a computer storage medium and a terminal for implementing data storage processing, which can reduce the impact of abnormal power failure on data storage.

An embodiment of the present invention provides a method for implementing data storage processing, including:

When the Nand flash memory is powered on again after an abnormal power failure, determine the storage page where the last data was written in the block where the data was written at the time of the abnormal power failure;

Using the storage page to which data was last written as a reference page, determining the storage page affected by the abnormal power failure;

Data storage processing is performed on the determined storage pages affected by the abnormal power failure.

In an exemplary embodiment, before determining the storage page of the block to which data is last written at the time of power failure, the method further includes:

The block to which the data is written at the time of the abnormal power failure is determined according to the operation log information of the application loaded with the Nand flash memory.

In an exemplary embodiment, determining the storage page affected by the abnormal power failure includes:

Determine the reference page and the first preset value page storage page before the reference page as the first storage page affected by abnormal power failure and having written data; and/or,

A second preset value page storage page after the reference page is determined as a second storage page affected by abnormal power failure and to which no data is written.

In an exemplary embodiment, the first storage page includes:

All memory pages in the bit line where the reference page is located.

In an exemplary embodiment, performing data storage processing on the determined storage page affected by the power failure includes:

When the storage page affected by the abnormal power failure includes the first storage page, migrating the data in the first storage page to a storage page not affected by the power failure;

When the storage pages affected by the abnormal power failure include the second storage page, preset invalid data is written into the second storage page.

In an exemplary embodiment, when the storage page affected by the abnormal power failure includes the first storage page and the second storage page, the performing data storage processing on the determined storage page affected by the power failure includes:

caching the data in the first storage page in a preset cache area;

Writing preset invalid data into the second storage page;

After writing the invalid data to the second storage page, the data in the cached first storage page is written.

On the other hand, an embodiment of the present invention further provides a computer storage medium, wherein a computer program is stored in the computer storage medium, and when the computer program is executed by a processor, the above-mentioned method for implementing data storage processing is implemented.

In another aspect, an embodiment of the present invention further provides a terminal, comprising: a memory and a processor, wherein the memory stores a computer program; wherein:

The processor is configured to execute the computer program in the memory;

When the computer program is executed by the processor, the method for implementing data storage processing as described above is implemented.

In another aspect, an embodiment of the present invention further provides a device for implementing data storage processing, comprising: a first determining unit, a second determining unit and a processing unit; wherein,

The first determining unit is configured to: when the Nand flash memory is powered on again after abnormal power failure, determine the storage page where the data is last written in the block where the data is written at the time of abnormal power failure;

The second determining unit is configured to: determine the storage page affected by the abnormal power failure by taking the storage page determined to have last written data as the reference page;

The processing unit is configured to perform data storage processing on the determined storage pages affected by the abnormal power failure.

In an exemplary embodiment, the second determining unit is configured to:

Determine the reference page and the first preset value page storage page before the reference page as the first storage page affected by abnormal power failure and having written data; and/or,

A second preset value page storage page after the reference page is determined as a second storage page affected by abnormal power failure and to which no data is written.

The embodiment of the present invention uses the storage page where data is written last in the block where data is written at the time of abnormal power failure of the Nand flash memory as the reference page, determines the storage page affected by the abnormal power failure, and then performs data storage processing on the storage page affected by the abnormal power failure, thereby reducing the impact of the abnormal power failure on data storage.

Other features and advantages of the present invention will be described in the following description, and partly become apparent from the description, or understood by practicing the present invention. The purpose and other advantages of the present invention can be realized and obtained by the structures particularly pointed out in the description, claims and drawings.

BRIEF DESCRIPTION OF THE DRAWINGS

The accompanying drawings are used to provide a further understanding of the technical solution of the present invention and constitute a part of the specification. Together with the embodiments of the present application, they are used to explain the technical solution of the present invention and do not constitute a limitation on the technical solution of the present invention.

FIG1 is a flow chart of a method for implementing data storage processing according to an embodiment of the present invention;

FIG. 2 is a structural block diagram of a device for implementing data storage processing according to an embodiment of the present invention.

DETAILED DESCRIPTION

In order to make the purpose, technical solution and advantages of the present invention more clear, the embodiments of the present invention will be described in detail with reference to the accompanying drawings. It should be noted that the embodiments and features in the embodiments of the present application can be combined with each other arbitrarily without conflict.

The steps shown in the flowchart of the accompanying drawings can be executed in a computer system such as a set of computer executable instructions. Also, although a logical sequence is shown in the flowchart, in some cases, the steps shown or described can be performed in a sequence different from that shown here.

FIG. 1 is a flow chart of a method for implementing data storage processing according to an embodiment of the present invention, as shown in FIG. 1 , including:

Step 101, when a NAND flash memory is powered on again after abnormal power failure, determining a storage page where data is last written in a block where data is written at the time of abnormal power failure;

In an exemplary embodiment, the embodiment of the present invention further includes, before step 101: determining a block to which data is written at the time of abnormal power failure according to the operation log information of the application loaded into the Nand flash memory.

In an exemplary embodiment, whether the Nand flash memory of the embodiment of the present invention is abnormally powered off can be determined by loading the running log information of the application of the Nand flash memory;

It should be noted that obtaining the operation log information, determining the abnormal power failure according to the operation log information, and determining the block to which the data is written at the time of the abnormal power failure from the operation log information can be implemented with reference to the relevant technology, and will not be described in detail here. After determining the block to which the data is written at the time of the abnormal power failure, the parameters for restoring the data in the block can be used to determine the storage page of the last written data when the power is turned on again.

Step 102, using the storage page to which data is last written as a reference page, and determining the storage page affected by the abnormal power failure;

In an exemplary embodiment, an embodiment of the present invention determines a storage page affected by an abnormal power failure, including:

Determine the reference page and the first preset value page storage page before the reference page as the first storage page affected by abnormal power failure and having written data; and/or,

A second preset value page storage page after the reference page is determined as a second storage page affected by abnormal power failure and to which no data is written.

The storage page affected by abnormal power failure in the embodiment of the present invention may include the first storage page, may include the second storage page, or may include the first storage page and the second storage page at the same time.

In an exemplary embodiment, the first storage page in the embodiment of the present invention includes:

All memory pages in the bit line where the reference page is located.

In an exemplary embodiment, the second preset value of the embodiment of the present invention is a value determined based on experiments, and can be a number greater than 36 but less than 208; for example, about 100.

Step 103: Perform data storage processing on the determined storage pages affected by the abnormal power failure.

In an exemplary embodiment, performing data storage processing on a determined storage page affected by power failure includes:

When the storage pages affected by the abnormal power failure include the first storage page, data in the first storage page is migrated to a storage page not affected by the power failure;

When the memory pages affected by the abnormal power failure include the second memory page, preset invalid data is written into the second memory page.

In an exemplary embodiment, the invalid data may include: invalid data marked by a preset identifier, for example, data marked as invalid by metadata (meta-data).

In an exemplary embodiment, when the storage page affected by abnormal power failure in the embodiment of the present invention includes a first storage page and a second storage page, data storage processing is performed on the determined storage page affected by the power failure, including:

caching the data in the first storage page in a preset cache area;

Writing preset invalid data into the second storage page;

After writing the second memory page of invalid data, the data in the first memory page of the cache is written.

In an exemplary embodiment, the cache area of the embodiment of the present invention may include: a pre-set storage area located in a static random access memory (SRAM) or a dynamic random access memory (DRAM).

Since in a block in a Nand flash memory, if data has been written in the first storage page, data writing is not allowed again, and data must be written using the storage page after the second storage page, so the second storage page is not allowed to be idle. In order to avoid the influence of abnormal power failure on the written data and to maximize the use of the storage resources in the Nand flash memory, the embodiment of the present invention writes invalid data in the second storage page and embeds the data in the first storage page after the second storage page, thereby reducing the influence of abnormal power failure on data storage.

The embodiment of the present invention uses the storage page where data is written last in the block where data is written at the time of abnormal power failure of the Nand flash memory as the reference page, determines the storage page affected by the abnormal power failure, and then performs data storage processing on the storage page affected by the abnormal power failure, thereby reducing the impact of the abnormal power failure on data storage.

An embodiment of the present invention further provides a computer storage medium, in which a computer program is stored. When the computer program is executed by a processor, the above-mentioned method for realizing data storage processing is implemented.

The embodiment of the present invention further provides a terminal, comprising: a memory and a processor, wherein a computer program is stored in the memory; wherein:

The processor is configured to execute the computer program in the memory;

When the computer program is executed by the processor, the method for implementing data storage processing as described above is implemented.

FIG2 is a structural block diagram of a device for implementing data storage processing according to an embodiment of the present invention. As shown in FIG2 , the device comprises: a first determining unit, a second determining unit and a processing unit; wherein,

The first determining unit is configured to: when the Nand Flash is powered on again after abnormal power failure, determine the storage page where the data is last written in the block where the data is written at the time of abnormal power failure;

The second determining unit is configured to: determine the storage page affected by the abnormal power failure by taking the storage page determined to have last written data as the reference page;

The processing unit is configured to perform data storage processing on the determined storage pages affected by the abnormal power failure.

The embodiment of the present invention uses the storage page where data is written last in the block where data is written at the time of abnormal power failure of the Nand flash memory as the reference page, determines the storage page affected by the abnormal power failure, and then performs data storage processing on the storage page affected by the abnormal power failure, thereby reducing the impact of the abnormal power failure on data storage.

In an exemplary embodiment, the first determining unit in the embodiment of the present invention is further configured to:

Determine the block to which data is written at the time of abnormal power failure based on the running log information of the application loaded into Nand Flash.

In an exemplary embodiment, the second determining unit of the embodiment of the present invention is configured as follows:

Determine the reference page and the first preset value page storage page before the reference page as the first storage page affected by abnormal power failure and having written data; and/or,

A second preset value page storage page after the reference page is determined as a second storage page affected by abnormal power failure and to which no data is written.

In an exemplary embodiment, the first storage page of the embodiment of the present invention includes:

All memory pages in the bit line where the reference page is located.

In an exemplary embodiment, the processing unit of the embodiment of the present invention is configured as follows:

When the storage pages affected by the abnormal power failure include the first storage page, data in the first storage page is migrated to a storage page not affected by the power failure;

When the memory pages affected by the abnormal power failure include the second memory page, preset invalid data is written into the second memory page.

In an exemplary embodiment, the processing unit of the embodiment of the present invention is configured as follows:

caching the data in the first storage page in a preset cache area;

Writing preset invalid data into the second storage page;

After writing the second memory page of invalid data, the data in the first memory page of the cache is written.

The following briefly describes the embodiments of the present invention through application examples. The application examples are only used to illustrate the present invention and are not used to limit the protection scope of the present invention.

Application Examples

This application example adds the data storage processing of the embodiment of the present invention to the abnormal power failure process. The processing after the abnormal power failure includes:

Step 1: When an abnormal power failure occurs during the data writing process of the Nand Flash, the block (Block) where data is being written is defined as Block N by loading the running log information of the Nand Flash application;

According to the related technology, after the Nand Flash loses power abnormally, the data writing process will continue after the Nand Flash loses power abnormally according to the characteristics of the Nand Flash.

Step 2: When restoring data after power-on, determine the largest storage page for writing data in Block N, that is, the storage page for writing data last;

Step 3: The storage page to which the data is last written is used as the reference page, and the data of all the storage pages in the wordline where the reference page is located are read out and written into a preset cache area;

In an exemplary embodiment, the cache area preset in the embodiment of the present invention may include: a storage area in a preset static random access memory (SRAM) and a dynamic random access memory (DRAM);

Step 4: writing invalid data into a second preset value page storage page after the reference page.

Step 5: Write the data cached in the cache area to the storage page following the storage page where the invalid data is written.

This application example avoids storing valid data in the storage page affected by the abnormal power outage by storing the written data affected by the abnormal power outage in the area not affected by the abnormal power outage; and writes invalid data in the area affected by the abnormal power outage where no data is written, thereby reducing the impact of the abnormal power outage on data storage. After writing the data in the cache area to the storage page after the storage page where the invalid data is written, the subsequent storage pages are also storage pages not affected by the abnormal power outage, and data writing can continue. The embodiment of the present invention can be applied to abnormal power outages caused by factors such as ambient temperature, number of wear and endurance, and will not cause data loss due to block instability caused by abnormal power outages, thereby improving the stability of Nand flash memory. It improves the user experience of using Nand flash memory for data storage.

“A person skilled in the art will appreciate that all or some of the steps, systems, and functional modules/units in the above disclosed methods may be implemented as software, firmware, hardware, and appropriate combinations thereof. In hardware implementations, the division between the functional modules/units mentioned in the above description does not necessarily correspond to the division of physical components; for example, a physical component may have multiple functions, or a function or step may be performed by several physical components in cooperation. Some or all components may be implemented as software executed by a processor, such as a digital signal processor or a microprocessor, or as hardware, or as an integrated circuit, such as an application specific integrated circuit. Such software may be distributed on a computer-readable medium, which may include a computer storage medium (or a non-transitory medium) and a communication medium (or a transient medium). As is known in the art, As is well known to those skilled in the art, the term computer storage media includes volatile and nonvolatile, removable and non-removable media implemented in any method or technology for storage of information such as computer readable instructions, data structures, program modules or other data. Computer storage media includes, but is not limited to, RAM, ROM, EEPROM, flash memory or other memory technology, CD-ROM, digital versatile disks (DVD) or other optical disk storage, magnetic cassettes, magnetic tapes, magnetic disk storage or other magnetic storage devices, or any other medium that can be used to store the desired information and can be accessed by a computer. In addition, as is well known to those skilled in the art, communication media typically contains computer readable instructions, data structures, program modules or other data in a modulated data signal such as a carrier wave or other transport mechanism, and may include any information delivery media".

Claims (5)

1.A method of implementing a data storage process, comprising:

When the NAND flash memory is powered up again after abnormal power failure, determining a storage page of data written in a block written in by data at the moment of abnormal power failure;

The storage page which is finally written with the data is used as a reference page, and the storage page which is affected by abnormal power failure is determined;

Carrying out data storage processing on the determined storage pages affected by abnormal power failure;

Wherein the determining the memory pages affected by the abnormal power down includes: the reference page and a first preset value page storage page in front of the reference page are determined to be a first storage page of written data, which is affected by abnormal power failure; determining a second preset value page storage page behind the reference page as a second storage page which is not written with data and is affected by abnormal power failure; the first memory page includes: all memory pages in the bit line where the reference page is located; the data storage processing is carried out on the determined storage pages affected by power failure, and the method comprises the following steps: when the memory page affected by abnormal power failure comprises the first memory page, migrating data in the first memory page to the memory page not affected by power failure; when the memory page affected by abnormal power failure comprises the second memory page, writing preset invalid data into the second memory page; when the memory pages affected by abnormal power failure include the first memory page and the second memory page, the data storage processing is performed on the determined memory pages affected by power failure, including: caching data in the first storage page in a preset cache area; writing preset invalid data in the second storage page; after writing the second memory page of the invalid data, writing data in the first memory page of the cache.

2. The method of claim 1, wherein the determining the power down time is prior to the last page of data written in the block of data writes, the method further comprising:

and determining the block in which the data is written at the abnormal power-down moment according to the operation log information of the application loading the Nand flash memory.

3. A computer storage medium having a computer program stored therein, which when executed by a processor, implements the method of implementing a data storage process according to any one of claims 1 to 2.

4. A terminal, comprising: a memory and a processor, the memory storing a computer program; wherein,

The processor is configured to execute the computer program in the memory;

The computer program, when executed by the processor, implements a method of implementing a data storage process according to any one of claims 1 to 2.

5. An apparatus for implementing a data storage process, comprising: the device comprises a first determining unit, a second determining unit and a processing unit; wherein,

The first determination unit is configured to: when the Nand flash memory is powered up again after abnormal power failure, determining a storage page of data written in a block written in by data at the moment of abnormal power failure;

The second determination unit is configured to: determining a storage page affected by abnormal power failure by taking the determined storage page of the last written data as a reference page, wherein the determining the storage page affected by abnormal power failure comprises the following steps: the reference page and a first preset value page storage page in front of the reference page are determined to be a first storage page of written data, which is affected by abnormal power failure; determining a second preset value page storage page behind the reference page as a second storage page which is not written with data and is affected by abnormal power failure; the first memory page includes: all memory pages in the bit line where the reference page is located;

the processing unit is configured to: carrying out data storage processing on the determined storage pages affected by abnormal power failure;

wherein; the data storage processing is carried out on the determined storage pages affected by power failure, and the method comprises the following steps: when the memory page affected by abnormal power failure comprises the first memory page, migrating data in the first memory page to the memory page not affected by power failure; when the memory page affected by abnormal power failure comprises the second memory page, writing preset invalid data into the second memory page; when the memory pages affected by abnormal power failure include the first memory page and the second memory page, the data storage processing is performed on the determined memory pages affected by power failure, including: caching data in the first storage page in a preset cache area; writing preset invalid data in the second storage page; after writing the second memory page of the invalid data, writing data in the first memory page of the cache.