WO2016173470A1 - Storage method and system based on embedded multi-media card - Google Patents

Abstract

Embodiments of the present invention provide a storage method and system based on an embedded multi-media card (eMMC). The method comprises: an application program layer sends a data write request to a file system layer; the data write request includes data which the application program requires to write into an eMMC storage element layer ; the file system layer responds to the data write request to determine the data type of the data; an eMMC block device drive program layer sets a data label and a reliable write flag bit in a write command parameter according to the data type; and the eMMC storage element layer determines a target storage space for the data from a prestored storage list according to the data label and reliable write flag bit, and stores the data into the target storage space; the storage list comprises a storage type of each storage space and an aging degree of each storage space. Implementation of the embodiments of the present invention can improve the flexibility of eMMC data storage.

Description

Storage method and system based on embedded multimedia card eMMC Technical field

The present invention relates to the field of data storage technologies, and in particular, to a storage method and system based on an embedded multimedia card eMMC.

Background technique

Embedded multimedia card (eMMC) is the main storage device in mobile terminals such as mobile phones and tablet computers. It uses NAND flash memory as the storage medium to store software and data in mobile terminals, and its functions and performances follow. The international standard specification JESD84, JESD84 specifies a number of storage characteristics, such as performance indicators, data security, storage reliability, partitioning, communication protocols, and read and write controls. Since the data acquired/generated by different software has different data attributes, the data of different data attributes have different reliability requirements. In order to provide different reliability, eMMC allows multiple storage areas to be set and different reliability for different storage areas. Sexuality, and in order to protect the stored data from being destroyed, the JESD84 specification also defines the function of reliable writing. However, the aging of eMMC, the uneven wear of NAND flash memory, and the different reliability of different storage areas make the reliability of different storage areas within eMMC greatly different, which will affect the reliability of data stored in the storage area. In addition, sudden power loss, system crash and other factors often lead to data corruption, loss or even storage media damage in NAND flash memory.

In order to alleviate the contradiction between eMMC performance, reliability and security, according to the JESD84 specification, the current eMMC divides the storage area according to the manner shown in Figure 1 to suit different storage purposes, as shown in Figure 1, eMMC storage. The area is divided into a boot partition of the storage system startup code, stores an encrypted partition with high security requirements, stores a general partition of the mobile terminal's factory data and key system data, and stores user's App, picture, video, and document data. The user data partition visible to the user is also specified in the user data partition as an enhanced user data partition and special protection measures are opened to improve the operation and data reliability in the enhanced user storage area. However, the storage area division mode shown in Figure 1 is static and coarse-grained. This storage area division method still cannot adapt the difference of data reliability requirements well, and reduces the flexibility of eMMC storage data. Sex.

Summary of the invention

The embodiment of the invention discloses a storage method and system based on the embedded multimedia card eMMC, which can improve the flexibility of the eMMC to store data.

A first aspect of the embodiments of the present invention discloses a storage system based on an embedded multimedia card eMMC, where the system includes an application layer, a file system layer, an eMMC block device driver layer, and an eMMC storage device layer, where:

The application layer is configured to send a data write request to the file system layer, where the data write request includes data that an application needs to write to the eMMC storage device layer;

The file system layer, configured to respond to the data write request and determine a data type of the data;

The eMMC block device driver layer is configured to set a data label in the write command parameter and a reliable write flag bit according to the data type;

The eMMC storage device layer is configured to determine, from the pre-stored storage list, a target storage space for the data according to the data label and the reliable write flag bit, and store the data in the target storage In space, the storage list includes a storage type of each storage space and an aging degree of each of the storage spaces.

In a first possible implementation manner of the first aspect of the embodiment, the data write request further includes a data attribute of the data;

The specific manner in which the file system layer responds to the data write request and determines the data type of the data is:

In response to the data write request, a data type of the data is identified based on the data attribute.

With reference to the first aspect of the embodiments of the present invention, in a second possible implementation manner of the first aspect of the embodiments, the data write request further includes an application type of the application;

The specific manner in which the file system layer determines the data type of the data in response to the data write request is:

In response to the data write request, a data type of the data is identified based on the application type.

With reference to the first aspect of the embodiments of the present invention, the first possible implementation manner of the first aspect of the embodiment of the present invention, or the second possible implementation manner of the first aspect of the embodiment of the present invention, in the first aspect of the embodiment of the present invention In three possible implementation manners, the storage type includes a storage type of one unit storing one binary data SLC, a storage type of one unit storing two-bit binary data MLC, and a storage type of one unit storing three-bit binary data TLC. Any one.

With reference to the third possible implementation manner of the first aspect of the embodiment of the present invention, in a fourth possible implementation manner of the first aspect of the embodiments, the data type includes metadata, structured user data, and different errors. Any one of different unstructured user data corresponding to the tolerance level.

A second aspect of the embodiments of the present invention discloses a storage method based on an embedded multimedia card eMMC, where the method includes:

The application layer sends a data write request to the file system layer, the data write request including data that the application needs to write to the eMMC storage device layer;

The file system layer is responsive to the data write request and determines a data type of the data;

The eMMC block device driver layer sets a data label in the write command parameter and a reliable write flag bit according to the data type;

Determining, by the eMMC storage device layer, a target storage space for the data from a pre-stored storage list according to the data label and the reliable write flag bit, and storing the data in the target storage space, The storage list includes a storage type of each storage space and an aging degree of each of the storage spaces.

In a first possible implementation manner of the second aspect of the embodiment, the data write request further includes a data attribute of the data;

The file system layer responds to the data write request and determines a data type of the data, including:

In response to the data write request, a data type of the data is identified based on the data attribute.

With reference to the second aspect of the embodiments of the present invention, in a second possible implementation manner of the second aspect of the embodiment, the data write request further includes an application type of the application;

The file system layer responds to the data write request and determines a data type of the data, including:

In response to the data write request, a data type of the data is identified based on the application type.

With reference to the second aspect of the embodiments of the present invention, the first possible implementation manner of the second aspect of the embodiment of the present invention, or the second possible implementation manner of the second aspect of the embodiment of the present invention, in the second aspect of the embodiment of the present invention In a third possible implementation manner, the storage type includes a storage type of one unit storing one bit binary data SLC, a storage type of one unit storing two binary data MLC, and a storage type of one unit storing three bit binary data TLC Any of them.

With reference to the third possible implementation manner of the second aspect of the embodiment of the present invention, in a fourth possible implementation manner of the second aspect of the embodiment, the data type includes metadata, structured user data, and different errors. Any one of different unstructured user data corresponding to the tolerance level.

In the embodiment of the present invention, the application layer sends a data write request to the file system layer, where the data write request includes data that the application needs to write to the eMMC storage device layer, and the file system layer determines the response in response to the data write request. The data type of the data, the eMMC block device driver layer sets the data label in the write command parameter and the reliable write flag bit according to the data type, and the eMMC storage device layer reads from the pre-stored storage list according to the data label and the reliable write flag bit. Determining a target storage space for the data, and storing the data in the target storage space, wherein the storage list includes a storage type of each storage space and an aging degree of each storage space. The embodiment of the present invention can dynamically adapt the reliability requirement of the data to the reliability provided by the storage medium in the eMMC according to the data type of the data to be stored, thereby improving the flexibility of the eMMC to store data.

DRAWINGS

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings to be used in the embodiments will be briefly described below. It is obvious that the drawings in the following description are only some embodiments of the present invention. Those skilled in the art can also obtain other drawings based on these drawings without paying any creative work.

1 is a schematic structural diagram of a storage area partition in a prior art eMMC storage device;

2 is a schematic structural diagram of a storage system based on an embedded multimedia card eMMC according to an embodiment of the present invention;

3 is a schematic flowchart of a storage method based on an embedded multimedia card eMMC according to an embodiment of the present invention;

FIG. 4 is a schematic flowchart diagram of another storage method based on an embedded multimedia card eMMC according to an embodiment of the present invention.

detailed description

The technical solutions in the embodiments of the present invention are clearly and completely described in the following with reference to the accompanying drawings in the embodiments of the present invention. It is obvious that the described embodiments are only a part of the embodiments of the present invention, but not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention.

The embodiment of the invention discloses a storage method and system based on the embedded multimedia card eMMC, which can dynamically adapt the reliability requirement of the data and the reliability provided by the storage medium according to the data type of the data to be stored, and improve the eMMC. The flexibility of storing data. The details are described below separately.

Please refer to FIG. 2. FIG. 2 is a schematic structural diagram of a storage system based on an embedded multimedia card eMMC according to an embodiment of the present invention. The system shown in FIG. 2 can be applied to a terminal using an eMMC storage device, such as a smart phone (such as an Android mobile phone, an iOS mobile phone, etc.), a tablet computer, a palm computer, and a mobile Internet device (MID), a PAD, and the like. The eMMC storage device includes an eMMC controller and one or more NAND flash memory chips, wherein one or more NAND flash memory chips are storage media for storing data, and the eMMC controller is responsible for internal and external control and communication, and the internal control is mainly The read, write, erase operations and address space management of the storage medium are mainly responsible for communicating with the host, receiving and responding to the commands of the host, and storing the data to be stored by the host to the corresponding storage medium and reading the host. The fetched data is taken out from the corresponding storage medium and sent to the host. As shown in FIG. 2, the embedded multimedia card eMMC-based storage system may include an application layer 201, a file system layer 202, an eMMC block device driver layer 203, and an eMMC storage device layer 204, wherein:

The application layer 201 is configured to send a data write request to the file system layer 202.

In the embodiment of the present invention, the data write request may include data that the application needs to write to the eMMC storage device layer 204.

The file system layer 202 is configured to respond to the data write request and determine the data type of the data.

In the embodiment of the present invention, the data type of the foregoing data may include, but is not limited to, metadata, structured user data, and different unstructured user data corresponding to different error tolerance levels (such as unstructured user data with high error tolerance level and errors). Any one of the unstructured user data and the like having a low tolerance level is not limited in the embodiment of the present invention. Among them, metadata is the key data of the file system and has high reliability requirements. Therefore, metadata is defined as the data with the highest reliability requirement, that is, the metadata is the data with the highest reliability level; structured user data (such as relationship) Type database system, etc.) is required to store correct and correct data, and its reliability requirements are lower than the reliability requirements of metadata; unstructured user data (such as audio and video data, etc.) is a small number of errors and does not affect Global data has the lowest reliability requirements, and the higher the error tolerance level, the lower the reliability requirements of unstructured user data.

As an optional implementation manner, the data write request may further include the data attribute of the data, and the specific manner of the file system layer 202 responding to the data write request and determining the data type of the data may be:

In response to the data write request, the data type of the data is identified based on the data attribute of the data.

As another optional implementation manner, the data writing request may further include an application type of the application, and the specific manner of the file system layer 202 responding to the data writing request and determining the data type of the data may be:

In response to the data write request, the data type of the data is identified according to the application type of the application.

The eMMC block device driver layer 203 is configured to set the data label Do_data_tag and the reliable write flag bit Do_rel_wr in the write command parameter according to the data type determined by the file system layer 202.

In the embodiment of the present invention, the data tag Do_data_tag and the reliable write flag bit Do_rel_wr are two flag bits in the write command parameter, and the data tag Do_data_tag and the reliable write flag bit Do_rel_wr mechanism are only for the write operation, and further, due to the NAND flash memory The original location is updated, so the data tag Do_data_tag and the reliable write flag Do_rel_wr mechanism can be applied to all write operations including writing new data and updating old data. The data tag Do_data_tag is a feature of the eMMC storage device, which allows the eMMC storage device to acquire data that needs to store data from the host. Types, timestamps, configuration parameters, etc., serve as a decision basis for the eMMC storage device layer 204 to allocate storage space for data that needs to be stored. The reliable write flag bit Do_rel_wr is used to identify whether to reliably write the above data. Reliable write is also a feature of the eMMC memory device, and it is an atomic write operation with certain constraints, which requires data that has been reliably written before. It is not damaged in the event of a sudden power failure or system crash.

In the embodiment of the present invention, for example, when the data type of the foregoing data determined by the file system layer 202 is metadata (such as file system metadata, etc.), the eMMC block device driver layer 203 may use the data tag Do_data_tag and be reliable. The write flag bit Do_rel_wr is set to 1, which means that the metadata has the highest reliability level, that is, it has the highest reliability requirement; when the file system layer 202 determines the data type of the above data is structured user data (such as mobile banking) When important data or the like, the eMMC block device driver layer 203 can set the data tag Do_data_tag to 0 and set the reliable write flag bit Do_rel_wr to 1, which indicates that the reliability level of the structured user data is the second highest, that is, its The reliability requirement is second highest; when the data type of the above data determined by the file system layer 202 is unstructured user data with low error tolerance level (such as game data or social data, etc.), the eMMC block device driver layer 203 may The data tag Do_data_tag is set to 1, and the reliable write flag bit Do_rel_wr is set to 0, which indicates that the error tolerance level is low for unstructured user data. The level of dependency is low, that is, it has low reliability requirements; when the data type of the above data determined by the file system layer 202 is unstructured user data with high error tolerance level (such as unimportant cached data or exchanged data, etc.) The eMMC block device driver layer 203 can set the data tag Do_data_tag to 0 and the reliable write flag bit Do_rel_wr to 0, which means that the unstructured user data with high error tolerance level has the lowest reliability level, that is, its The reliability requirements are the lowest.

The eMMC storage device layer 204 is configured to determine, from the pre-stored storage list, a target storage space for the data according to the data tag Do_data_tag and the reliable write flag bit Do_rel_wr, and store the data in the determined target storage space. .

In the embodiment of the present invention, the firmware of the internal controller of the eMMC storage device layer 204 can maintain a storage list, which can include the storage type of each storage space and the aging degree of each storage space, wherein each The degree of aging of the storage space may be determined by the number of erasures and the degree of wear of each storage space. Optionally, the storage list may also include an idle state of each storage space, such as the remaining space of each storage space (ie, idle Space) capacity or each storage space The ratio of the remaining space capacity to the total space capacity of the storage space, etc., is not limited in the embodiment of the present invention.

Optionally, the storage type of each storage space may include, but is not limited to, a storage type of one unit storing one-bit binary data SLC (Single-Level Cell), and one unit storing storage of two-bit binary data MLC (Multi-Level Cell). The type and the one of the storage types of the three-bit binary data TLC (Trinary-Level Cell) are not limited in the embodiment of the present invention. The storage space of the same storage type can be defined as different reliability levels according to the aging degree of each storage space. For example, the storage space with the storage type SLC can be classified into an SLC storage space with a low degree of aging and a high degree of aging. SLC type storage space of different ages such as SLC type storage space, storage space of MLC type can be divided into MLC type storage space with low aging degree and MLC type storage space with high aging degree, etc. MLC type storage of different aging degrees The space where the storage type is TLC can be divided into TLC storage spaces with low aging and TLC storage spaces with high aging, and the storage space of the same storage type. The lower the degree of aging, the higher the reliability level.

Specifically, the eMMC storage device layer 204 can store the metadata and the structured user data in an SLC type storage space and implement a reliable write operation, and can store the unstructured user data in the MLC type storage space, further The eMMC storage device layer 204 can store unstructured user data with a high error tolerance level in an MMC type storage space with a high degree of aging, and store unstructured user data with a low error tolerance level at a low degree of aging. MLC type storage space.

In the embodiment of the present invention, for example, it is assumed that the foregoing storage list is as shown in Table 1 below, and the data type of the foregoing data is metadata, structured user data, unstructured user data with low error tolerance level, or high error tolerance level. The unstructured user data, when the data type of the data determined by the file system layer 202 is metadata, the eMMC storage device layer 204 preferentially selects the SLC type storage space with the lowest degree of aging for the data, if the SLC type storage space If there is no free space, the eMMC storage device layer 204 selects the MLC type storage space with the lowest degree of aging for the above data. If there is no free space in the MLC type storage space, the allocation fails; when the file system layer 202 determines the data of the above data. When the type is structured user data, the eMMC storage device layer 204 preferentially selects the SLC type storage space with the highest degree of aging for the above data, and if there is no free space in the SLC type storage space, the eMMC storage device The layer 204 selects the MLC type storage space with the lowest degree of aging for the above data. If there is no free space in the MLC type storage space, the allocation fails; when the data type of the data determined by the file system layer 202 is low, the error tolerance level is low. When the user data is structured, the eMMC storage device layer 204 preferentially selects the MLC type storage space with the lowest degree of aging for the above data. If there is no free space in the MLC type storage space, the eMMC storage device layer 204 selects the SLC with the highest degree of aging for the above data. Type storage space, if there is no free space in the SLC type storage space, the allocation fails; when the data type of the above data determined by the file system layer 202 is unstructured user data with high error tolerance level, the eMMC storage device layer 204 The MLC type storage space with the highest degree of aging is selected for the above data. If there is no free space in the MLC type storage space, the eMMC storage device layer 204 selects the SLC type storage space with the highest degree of aging for the above data, and if the SLC type storage space is also If there is no free space, the allocation fails. Table 1 is:

Table 1 Storage list

Storage type Degree of aging SLC type low SLC type high MLC type low MLC type high

The embodiments of the present invention can dynamically adapt the data reliability type to the reliability of the storage medium in the eMMC according to the data type of the data to be stored, improve the flexibility of the eMMC storage data, and can meet different reliability requirements. The data is stored in storage spaces of different reliability levels, ensuring the reliability requirements of the data.

Please refer to FIG. 3. FIG. 3 is a schematic flowchart of a storage method based on an embedded multimedia card eMMC according to an embodiment of the present invention. Among them, the method shown in FIG. 3 can be applied to the system shown in FIG. 2. As shown in FIG. 3, the embedded multimedia card eMMC-based storage method may include the following steps:

S301. The application layer sends a data write request to the file system layer.

In the embodiment of the present invention, the data write request may include data that the application needs to write to the eMMC storage device layer.

S302. The file system layer responds to the data write request and determines a data type of data to be written.

In the embodiment of the present invention, the data type of the foregoing data may include, but is not limited to, metadata, structured user data, and different unstructured user data corresponding to different error tolerance levels (such as unstructured user data with high error tolerance level and errors). Any one of the unstructured user data and the like having a low tolerance level is not limited in the embodiment of the present invention. Among them, metadata is the key data of the file system and has high reliability requirements. Therefore, metadata is defined as the data with the highest reliability requirement, that is, the metadata is the data with the highest reliability level; structured user data (such as relationship) Type database system, etc.) is required to store correct and correct data, and its reliability requirements are lower than the reliability requirements of metadata; unstructured user data (such as audio and video data, etc.) is a small number of errors and does not affect Global data has the lowest reliability requirements, and the higher the error tolerance level, the lower the reliability requirements of unstructured user data.

As an optional implementation manner, the data write request may further include the data attribute of the data, where the file system layer responds to the data write request and determines the data type of the data may include:

In response to the data write request, the data type of the data is identified based on the data attribute of the data.

As another optional implementation manner, the data writing request may further include an application type of the application, and the file system layer responding to the data writing request and determining the data type of the data may include:

In response to the data write request, the data type of the data is identified according to the application type of the application.

S303. The eMMC block device driver layer sets the data label Do_data_tag and the reliable write flag bit Do_rel_wr in the write command parameter according to the above data type.

In the embodiment of the present invention, the data tag Do_data_tag and the reliable write flag bit Do_rel_wr are two flag bits in the write command parameter, and the data tag Do_data_tag and the reliable write flag bit Do_rel_wr mechanism are only for the write operation, and further, due to the NAND flash memory The original location is updated, so the data tag Do_data_tag and the reliable write flag Do_rel_wr mechanism can be applied to all write operations including writing new data and updating old data. Where the data tag Do_data_tag is eMMC A feature of the memory device that allows the eMMC memory device to obtain data types, time stamps, and configuration parameters from the host that need to store data to serve as a basis for the eMMC memory device layer to allocate storage space for data that needs to be stored. The reliable write flag bit Do_rel_wr is used to identify whether to reliably write the above data. Reliable write is also a feature of the eMMC memory device, and it is an atomic write operation with certain constraints, which requires data that has been reliably written before. It is not damaged in the event of a sudden power failure or system crash.

In the embodiment of the present invention, for example, when the data type of the data determined by the file system layer is metadata (such as file system metadata, etc.), the eMMC block device driver layer may use the data tag Do_data_tag and the reliable write flag. The bit Do_rel_wr is set to 1, which means that the metadata has the highest reliability level, that is, it has the highest reliability requirement; when the data type of the above data determined by the file system layer is structured user data (such as mobile banking important data, etc.) When the eMMC block device driver layer can set the data tag Do_data_tag to 0 and the reliable write flag bit Do_rel_wr to 1, indicating that the structured user data has the second highest reliability level, that is, its reliability requirement. High; when the file system layer determines that the data type of the above data is unstructured user data with low error tolerance level (such as game data or social data, etc.), the eMMC block device driver layer can set the data tag Do_data_tag to 1 And set the reliable write flag bit Do_rel_wr to 0, which means that the unstructured user data with low error tolerance level has low reliability level. That is, it has low reliability requirements; when the data type of the above data determined by the file system layer is unstructured user data with high error tolerance level (such as unimportant cached data or exchanged data, etc.), the eMMC block device driver The layer can set the data tag Do_data_tag to 0 and the reliable write flag bit Do_rel_wr to 0, which means that the unstructured user data with high error tolerance level has the lowest reliability level, that is, it has the lowest reliability requirement.

S304. The eMMC storage device layer determines a target storage space for the data from the pre-stored storage list according to the data label and the reliable write flag, and stores the data in the target storage space.

In the embodiment of the present invention, the firmware of the internal controller of the eMMC storage device layer may maintain a storage list, and the storage list may include a storage type of each storage space and an aging degree of each storage space, where each storage The degree of aging of the space may be determined by the number of erasures of each storage space and the degree of wear. Optionally, the storage list may also include an idle state of each storage space, such as the remaining space of each storage space (ie, free space). Capacity or per storage space The ratio of the remaining space capacity to the total space capacity of the storage space, etc., is not limited in the embodiment of the present invention.

Optionally, the storage type of each storage space may include, but is not limited to, a storage type of one unit storing one-bit binary data SLC (Single-Level Cell), and one unit storing storage of two-bit binary data MLC (Multi-Level Cell). The type and the one of the storage types of the three-bit binary data TLC (Trinary-Level Cell) are not limited in the embodiment of the present invention. The storage space of the same storage type can be defined as different reliability levels according to the aging degree of each storage space. For example, the storage space with the storage type SLC can be classified into an SLC storage space with a low degree of aging and a high degree of aging. SLC type storage space of different ages such as SLC type storage space, storage space of MLC type can be divided into MLC type storage space with low aging degree and MLC type storage space with high aging degree, etc. MLC type storage of different aging degrees The space where the storage type is TLC can be divided into TLC storage spaces with low aging and TLC storage spaces with high aging, and the storage space of the same storage type. The lower the degree of aging, the higher the reliability level.

Specifically, the eMMC storage device layer can store the metadata and the structured user data in the SLC type storage space and implement a reliable write operation, and can store the unstructured user data in the MLC type storage space. Further, The eMMC storage device layer can store unstructured user data with high error tolerance level in the MMC type storage space with high degree of aging, and store unstructured user data with low error tolerance level in the less aged MLC. Type of storage space.

In the embodiment of the present invention, the application layer sends a data write request to the file system layer, where the data write request includes data that the application needs to write to the eMMC storage device layer, and the file system layer determines the response in response to the data write request. The data type of the data, the eMMC block device driver layer sets the data label in the write command parameter and the reliable write flag bit according to the data type, and the eMMC storage device layer reads from the pre-stored storage list according to the data label and the reliable write flag bit. Determining a target storage space for the data, and storing the data in the target storage space, wherein the storage list includes a storage type of each storage space and an aging degree of each storage space. The embodiments of the present invention can dynamically adapt the data reliability type to the reliability of the storage medium in the eMMC according to the data type of the data to be stored, improve the flexibility of the eMMC storage data, and can meet different reliability requirements. Data is stored in storage spaces of different reliability levels, ensuring reliable data Sexual needs.

Please refer to FIG. 4. FIG. 4 is a schematic flowchart diagram of another storage method based on an embedded multimedia card eMMC according to an embodiment of the present invention. 4 is any one of the data to be written as metadata, structured user data, unstructured user data with low error tolerance level, and unstructured user data with high error tolerance level, and the storage list is as follows. Table 1 shows a flow chart of an embedded multimedia card eMMC-based storage method. As shown in FIG. 4, the embedded multimedia card eMMC-based storage method may include the following steps:

S401. The application layer sends a data write request to the file system layer.

S402. The file system layer determines the data type of the data to be written included in the data writing request in response to the data writing request.

In the embodiment of the present invention, when the data type of the data determined in step S402 is metadata, step S403 is performed by the eMMC block device driver layer; when the data type of the data determined in step S402 is structured user data. Step S405 is performed by the eMMC block device driver layer; when the data type of the data determined in step S402 is unstructured user data with a low error tolerance level, step S407 is performed by the eMMC block device driver layer; When the data type of the data determined in the data is unstructured user data with a high error tolerance level, step S409 is performed by the eMMC block device driver layer.

S403. The eMMC block device driver layer sets the data label Do_data_tag and the reliable write flag bit Do_rel_wr in the write command parameter to 1.

S404. The eMMC storage device layer determines that the target storage space for the metadata is the SMC type storage space with the lowest degree of aging, and stores the metadata in the SLC type storage space with the lowest degree of aging.

In the embodiment of the present invention, if there is no free space in the SLC type storage space, the eMMC storage device layer selects the MLC type storage space with the lowest degree of aging for the metadata, and if there is no free space in the MLC type storage space, the allocation fails.

S405. The eMMC block device driver layer sets the data label Do_data_tag in the write command parameter to 0, and sets the reliable write flag bit Do_rel_wr to 1.

S406. The eMMC storage device layer determines that the target storage space for structured user data is the SMC type storage space with the highest degree of aging, and stores the structured user data in the highest degree of aging. SLC type storage space.

In the embodiment of the present invention, if there is no free space in the SLC type storage space, the eMMC storage device layer selects the MLC type storage space with the lowest aging degree for the structured user data, and if there is no free space in the MLC type storage space, the allocation fails. .

S407. The eMMC block device driver layer sets the data label Do_data_tag in the write command parameter to 1, and sets the reliable write flag bit Do_rel_wr to zero.

S408. The eMMC storage device layer determines that the target storage space for the unstructured user data with low error tolerance level is the least aged MLC type storage space, and stores the unstructured user data with low error tolerance level at the aging degree. The lowest MLC type storage space.

In the embodiment of the present invention, if there is no free space in the MLC type storage space, the eMMC storage device layer selects the SLC type storage space with the highest degree of aging for the unstructured user data with low error tolerance level, and if there is no SLC type storage space, If there is free space, the allocation fails.

S409. The eMMC block device driver layer sets the data tag Do_data_tag to 0 and sets the reliable write flag bit Do_rel_wr to zero.

S410. The eMMC storage device layer determines that the target storage space for the unstructured user data with high error tolerance level is the most aging MLC type storage space, and stores the unstructured user data with high error tolerance level at the aging degree. The highest MLC type storage space.

In the embodiment of the present invention, if there is no free space in the MLC type storage space, the eMMC storage device layer selects the SLC type storage space with the highest degree of aging for the unstructured user data with high error tolerance level, and if there is no SLC type storage space, If there is free space, the allocation fails.

The embodiments of the present invention can dynamically adapt the data reliability type to the reliability of the storage medium in the eMMC according to the data type of the data to be stored, improve the flexibility of the eMMC storage data, and can meet different reliability requirements. The data is stored in storage space with different reliability capabilities, ensuring the reliability requirements of the data.

A person skilled in the art may understand that all or part of the various steps of the foregoing embodiments may be performed by a program to instruct related hardware. The program may be stored in a computer readable storage medium, and the storage medium may include: Flash disk, Read-Only Memory (ROM), Random Access Memory (RAM), disk or optical disk.

The storage method and system based on the embedded multimedia card eMMC provided by the embodiments of the present invention are described in detail. The principles and implementation manners of the present invention are described in the specific examples. The description of the above embodiments is only The method for understanding the present invention and its core idea; at the same time, for those of ordinary skill in the art, according to the idea of the present invention, there will be changes in specific embodiments and application scopes. The description should not be construed as limiting the invention.

Claims (10)

A storage system based on an embedded multimedia card eMMC, characterized in that the system comprises an application layer, a file system layer, an eMMC block device driver layer and an eMMC storage device layer, wherein: The application layer is configured to send a data write request to the file system layer, where the data write request includes data that an application needs to write to the eMMC storage device layer; The file system layer, configured to respond to the data write request and determine a data type of the data; The eMMC block device driver layer is configured to set a data label in the write command parameter and a reliable write flag bit according to the data type; The eMMC storage device layer is configured to determine, from the pre-stored storage list, a target storage space for the data according to the data label and the reliable write flag bit, and store the data in the target storage In space, the storage list includes a storage type of each storage space and an aging degree of each of the storage spaces. The system of claim 1 wherein said data write request further comprises a data attribute of said data; The specific manner in which the file system layer responds to the data write request and determines the data type of the data is: In response to the data write request, a data type of the data is identified based on the data attribute. The system of claim 1 wherein said data write request further comprises an application type of said application; The specific manner in which the file system layer determines the data type of the data in response to the data write request is: In response to the data write request, a data type of the data is identified based on the application type. The system according to any one of claims 1 to 3, wherein said storage type package A unit stores a storage type of one bit binary data SLC, a storage type of one unit storing two binary data MLC, and a storage type of one unit storing three bit binary data TLC. The system of claim 4, wherein the data type comprises any one of metadata, structured user data, and different unstructured user data corresponding to different error tolerance levels. A storage method based on an embedded multimedia card eMMC, characterized in that the method comprises: The application layer sends a data write request to the file system layer, the data write request including data that the application needs to write to the eMMC storage device layer; The file system layer is responsive to the data write request and determines a data type of the data; The eMMC block device driver layer sets a data label in the write command parameter and a reliable write flag bit according to the data type; Determining, by the eMMC storage device layer, a target storage space for the data from a pre-stored storage list according to the data label and the reliable write flag bit, and storing the data in the target storage space, The storage list includes a storage type of each storage space and an aging degree of each of the storage spaces. The method of claim 6 wherein said data write request further comprises a data attribute of said data; The file system layer responds to the data write request and determines a data type of the data, including: In response to the data write request, a data type of the data is identified based on the data attribute. The method of claim 6 wherein said data write request further comprises an application type of said application; The file system layer responds to the data write request and determines a data type of the data, including: In response to the data write request, a data type of the data is identified based on the application type. The method according to any one of claims 6 to 8, wherein the storage type comprises a storage type of one unit storing one bit binary data SLC, a storage type of one unit storing two-bit binary data MLC, and a unit storage Any of the storage types of the three-bit binary data TLC. The method of claim 9, wherein the data type comprises any one of metadata, structured user data, and different unstructured user data corresponding to different error tolerance levels.

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