CN109032522A - The method for reading data and solid state hard disk of solid state hard disk - Google Patents
The method for reading data and solid state hard disk of solid state hard disk Download PDFInfo
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- CN109032522A CN109032522A CN201810831053.6A CN201810831053A CN109032522A CN 109032522 A CN109032522 A CN 109032522A CN 201810831053 A CN201810831053 A CN 201810831053A CN 109032522 A CN109032522 A CN 109032522A
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- hard disk
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- state hard
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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
- G06F3/061—Improving I/O performance
- G06F3/0611—Improving I/O performance in relation to response time
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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
- G06F3/0668—Interfaces specially adapted for storage systems adopting a particular infrastructure
- G06F3/0671—In-line storage system
- G06F3/0673—Single storage device
- G06F3/0674—Disk device
- G06F3/0676—Magnetic disk device
Abstract
The embodiment of the present application discloses the method for reading data and solid state hard disk of solid state hard disk, and the mode that when write request for not completing in solid state hard disk is used without read lock reads data, improves the reading performance of solid state hard disk.The embodiment of the present application method includes: first counter records the first write request number of solid state hard disk, and the first write request number is the write request number that the host that the solid state hard disk receives is sent；Second counter records the second write request number of the solid state hard disk, the second write request number are the write request number that the solid state hard disk completes write operation；The solid state hard disk receives the read request that the host is sent；The solid state hard disk judges whether the first write request number and the second write request number are equal；If so, the mode that the solid state hard disk is used without read lock reads the logic in Double Data Rate synchronous DRAM DDR SDRAM to physical address translations L2P table.
Description
Technical field
This application involves field of computer technology, in particular to the method for reading data and the solid-state of a kind of solid state hard disk
Hard disk.
Background technique
With the development of the technologies such as internet, cloud computing, Internet of Things, solid state hard disk is extensive as new generation storage equipment
It is applied by masses.Reading performance is a very important index of solid state hard disk (solid state disk, SSD).
At present solid state hard disk read data a kind of method is, solid state hard disk receive host transmission read request after,
It can be to Double Data Rate synchronous DRAM (double data rate synchronous dynamic random
Access memory, DDR SDRAM) application read lock, solid state hard disk is after the read lock for getting DDR SDRAM authorization, beginning
L2P table is read from DDR SDRAM, finally, the read lock in solid state hard disk release DDR SDRAM.
However, requiring to access DDR again since solid state hard disk is after having read L2P table from DDR SDRAM every time
SDRAM can just discharge read lock from DDR SDRAM, and access every time DDR SDRAM require consumption 500 nanoseconds (ns) when
Between, cause the operation of the input and output of the data of each solid state hard disk that the delay of 500ns all can accordingly occur, reading performance is caused to drop
It is low.
Summary of the invention
The embodiment of the present application provides the method for reading data and solid state hard disk of solid state hard disk, can not have in solid state hard disk
The mode that read lock is used without when having unfinished write request reads data, improves the reading performance of solid state hard disk.
The embodiment of the present application provides a kind of method for reading data of solid state hard disk, comprising:
First counter records the first write request number of solid state hard disk, the first write request number are that the solid-state is hard
The write request number that the host that disk receives is sent；
Second counter records the second write request number of the solid state hard disk, the second write request number are described solid
The write request number of state hard disk completion write operation；
The solid state hard disk receives the read request that the host is sent；
The solid state hard disk judges whether the first write request number and the second write request number are equal；
If so, the mode that the solid state hard disk is used without read lock reads Double Data Rate synchronous DRAM
Logic in DDR SDRAM is to physical address translations L2P table.
Optionally, after the solid state hard disk judges whether the first write request number is equal with the second write request number,
The method also includes:
If it is not, then the solid state hard disk uses the mode with read lock to read the L2P table.
Optionally, the solid state hard disk reads the L2P table using the mode with read lock and includes:
The solid state hard disk is to the DDR SDRAM application read lock；
The solid state hard disk obtains the read lock of the DDR SDRAM authorization；
The solid state hard disk reads the L2P table using the mode with read lock.
Optionally, after the solid state hard disk reads the L2P table using the mode with read lock, the method is also wrapped
It includes:
The solid state hard disk discharges the read lock in the DDR SDRAM.
The embodiment of the present application provides a kind of solid state hard disk characterized by comprising
First recording unit, for first counter records the first write request number, the first write request number is
The write request number that the host that the solid state hard disk receives is sent；
Second recording unit, for second counter records the second write request number, the second write request number is
The solid state hard disk completes the write request number of write operation；
Receiving unit, the read request sent for receiving the host；
Judging unit, for judging whether the first write request number and the second write request number are equal；
First reading unit, for when determining that the first write request number is equal with the second write request number, then using not
Mode with read lock reads the logic in Double Data Rate synchronous DRAM DDR SDRAM to physical address translations L2P
Table.
Optionally, the solid state hard disk further include:
Second reading unit, for when determining that the first write request number and the second write request number are unequal, then using
Mode with read lock reads the L2P table.
Optionally, second reading unit is specifically included to the DDR SDRAM application read lock；Obtain the DDR
The read lock of SDRAM authorization；The L2P table is read using the mode with read lock.
Optionally, the solid state hard disk further include:
Releasing unit, for discharging the read lock in the DDR SDRAM.
The embodiment of the present application provides a kind of solid state hard disk, which there are the data for realizing above-mentioned solid state hard disk to read
Take the function of solid state hard disk behavior in method.The function can be by hardware realization, can also be real by executing corresponding software
It is existing.The hardware or software include one or more modules corresponding with above-mentioned function.
The embodiment of the present application provides a kind of computer storage medium, and the computer storage medium is for storing above-mentioned solid-state
Computer software instructions used in hard disk comprising for executing as program designed by solid state hard disk.
The embodiment of the present application provides a kind of computer program product, which includes that computer software refers to
It enables, the process which can be loaded by processor to realize above-mentioned method for reading data.
As can be seen from the above technical solutions, the embodiment of the present application has the advantage that since solid state hard disk can use
One counter records the first write request number, the first write request number are the write request that the host that solid state hard disk receives is sent
Number, and with second counter records the second write request number, which is that solid state hard disk completes write operation
Write request number, the read request that then receiving host is sent, is determining that the first write request number is equal with the second write request number
When, the mode that solid state hard disk is used without read lock reads the L2P table in DDR SDRAM, it follows that writing what is do not completed
In the case where request, solid state hard disk has used the mode without read lock to read L2P table, there is no need to after having read L2P table,
Access DDR SDRAM discharges read lock again, can thus reduce the number of solid state hard disk access DDR SDRAM, save access
The time of DDR SDRAM, reduce the delay of the data input and output of solid state hard disk, to improve the reading of solid state hard disk
Energy.
Detailed description of the invention
Fig. 1 is one embodiment schematic diagram of the method for reading data of solid state hard disk in the embodiment of the present application；
Fig. 2 is another embodiment schematic diagram of the method for reading data of solid state hard disk in the embodiment of the present application；
Fig. 3 is one embodiment schematic diagram of solid state hard disk in the embodiment of the present application；
Fig. 4 is another embodiment schematic diagram of solid state hard disk in the embodiment of the present application.
Specific embodiment
The embodiment of the present application provides the method for reading data and solid state hard disk of solid state hard disk, for not having in solid state hard disk
The mode that read lock is used without when having unfinished write request reads data, improves the reading performance of solid state hard disk.
Referring to Fig. 1, Fig. 1 is one embodiment of the method for reading data of solid state hard disk in the embodiment of the present application.
One embodiment of the method for reading data of solid state hard disk includes: in the embodiment of the present application
101, first counter records the first write request number of solid state hard disk；
In the present embodiment, solid state hard disk is in the first counter of its own internal preset, when host is sent to solid state hard disk
When write request, solid state hard disk can be recorded the write request number that host is sent by first counter, and first writes
Request number is the write request number for the host transmission that solid state hard disk receives.That is, solid state hard disk is counted with first
Device records the first write request number.
102, second counter records the second write request number of solid state hard disk；
In the present embodiment, solid state hard disk has also preset the second counter inside its own, which is used to remember
The second write request number is recorded, and the second write request number is the write request number that solid state hard disk completes write operation.
It should be noted that step 101 and 102 sequencings that are not carried out, can first carry out step 101, then execute
Step 102, step 102 can also be first carried out, then executes step 101, specifically herein without limitation.
103, the read request that solid state hard disk receiving host is sent；
Solid state hard disk in the process of running, can receive the read request of host transmission, which reads for solid state hard disk
The data in DDR SDRAM are taken, including L2P table.
It should be noted that step 103 and step 101,102 sequencings being not carried out, can first carry out step
101,102, then step 103 is executed, step 101 can also be first carried out, then execute step 102,103, step can also be first carried out
102, then step 101,103 are executed, specifically herein without limitation.
104, solid state hard disk judges whether the first write request number and the second write request number are equal；
In the present embodiment, solid state hard disk is after the read request for receiving host transmission, it can be determined that the first write request number
It is whether equal with the second write request number, that is to say, that solid state hard disk needs to judge that solid state hard disk receives from host
Whether write request number is equal to the write request number that solid state hard disk completes write operation, if so, thening follow the steps 105.
105, the mode that solid state hard disk is used without read lock reads the L2P table in DDR SDRAM；
In the present embodiment, if solid state hard disk determines that the first write request number is equal with the second write request number, show
The write request not completed in solid state hard disk, this means that not new write operation carries out the L2P table in DDR SDRAM
It updates, therefore even if the mode that solid state hard disk is used without read lock at this time reads L2P table, the mistake for reading legacy data will not occur
Accidentally, which refers to the L2P table updated when a write operation.Therefore the host hair received is determined in solid state hard disk
In the case that the write request number and solid state hard disk sent complete the write request number of write operation, solid state hard disk be can be used without reading
The mode of lock reads the L2P table in DDR SDRAM.
If solid state hard disk reads the L2P table in DDR SDRAM using locking mode, subsequent solid state hard disk needs again
Secondary access DDR SDRAM, to discharge the read lock in DDR SDRAM.Since the mode that solid state hard disk is used without lock reads DDR
L2P table in SDRAM is thus reduced there is no need to read L2P table and then secondary access DDR SDRAM release read lock
The number of access DDR SDRAM, reduces the time of access DDR SDRAM.
In the embodiment of the present application, since solid state hard disk is in the write request for determining that the host that solid state hard disk receives is sent
In the case that number is equal with the solid state hard disk completion write request number of write operation, that is to say, that when solid state hard disk does not have in determination
In the case where unfinished write request, solid state hard disk can be used the mode without read lock and read L2P table in DDR SDRAM,
There is no need to read L2P table and then secondary access DDR SDRAM release read lock, solid state hard disk access can be reduced in this way
The number of DDR SDRAM saves the time of access DDR SDRAM, reduces the delay of the data input and output of solid state hard disk, from
And improve the reading performance of solid state hard disk.
One embodiment of the method for reading data of solid state hard disk in the embodiment of the present application is described in detail above,
Another embodiment of the method for reading data of solid state hard disk in the embodiment of the present application is described below.Referring to fig. 2, this Shen
Please another embodiment of the method for reading data of solid state hard disk include: in embodiment
201, first counter records the first write request number of solid state hard disk；
202, second counter records the second write request number of solid state hard disk；
203, the read request that solid state hard disk receiving host is sent；
204, solid state hard disk judges whether the first write request number and the second write request number are equal；
In the present embodiment, solid state hard disk may determine that whether the first write request number and the second write request number are equal,
That is to need to judge whether the write request number from host that solid state hard disk receives is equal to solid state hard disk complete for solid state hard disk
At the write request number of write operation, if so, thening follow the steps 202；If it is not, thening follow the steps 206.
205, the mode that solid state hard disk is used without read lock reads the L2P table in DDR SDRAM；
It should be noted that the step 201 in embodiment shown in Fig. 2 is into step 205 and embodiment shown in FIG. 1
Step 101 is similar to step 105, and specific details are not described herein again.
206, solid state hard disk reads the L2P table of DDR SDRAM using the mode with read lock；
In the present embodiment, if solid state hard disk determines that the first write request number and the second write request number are unequal, table
There are also unfinished write requests in bright solid state hard disk, this means that can be to the L2P table in DDR SDRAM there are also new write operation
It is updated, so if the mode for being used without read lock reads L2P table, it is likely that solid state hard disk occurs and reads legacy data
Mistake, the legacy data refer to the L2P table that a completed write operation is updated.In such cases, solid state hard disk needs
The L2P table that DDR SDRAM is read using the mode with read lock, this assures solid state hard disk can read correctly it is newest
The L2P table of update.
Further, the concrete mode for the L2P table that solid state hard disk reads DDR SDRAM using the mode of read lock is, firstly,
Solid state hard disk can will be read after DDR SDRAM receives the request of solid state hard disk application read lock to DDR SDRAM application read lock
Lock licenses to solid state hard disk, in this way, solid state hard disk can obtain the read lock of DDR SDRAM authorization；Then, solid state hard disk can be with
The L2P table in DDR SDRAM is read using the mode with read lock.
207, the read lock in solid state hard disk release DDR SDRAM.
Solid state hard disk is after having read the L2P table in DDR SDRAM using the mode with read lock, in order to ensure then leading
The read request that machine is constantly sent can apply to read lock, it is also necessary to visit again a DDR SDRAM, discharge in DDR SDRAM
Read lock.
Specifically, the method for read lock in solid state hard disk release DDR SDRAM is update in DDR SDRAM with the read lock
The lock bit can be replaced into " 0 " from " 1 " by corresponding lock bit (lock bit), solid state hard disk, at this point, lock bit is " 1 "
Indicate that DDR SDRAM authorizes read lock to solid state hard disk, lock bit is that " 0 " then indicates that DDR SDRAM removes lock bit
" 1 ", replaces it with " 0 ", indicates that solid state hard disk releases read lock in this way.
In the embodiment of the present application, since solid state hard disk is in the write request number and solid-state for determining that the host received is sent
When the write request number of hard disk completion write operation is equal, that is to say, that solid state hard disk is determining the write request not completed
In the case of, solid state hard disk is not necessarily to that the data in DDR SDRAM can be directly read from DDR SDRAM acquisition read lock, reduces
Solid state hard disk accesses the access times of DDR SDRAM, reduces the delay of the data input and output of solid state hard disk, improves solid-state
The reading performance of hard disk；And determine that the write request number that the host received is sent and solid state hard disk complete write operation in solid state hard disk
Write request number it is unequal when, that is to say, that solid state hard disk is determining that solid-state is hard in the case where there is unfinished write request
Disk can obtain read lock from DDR SDRAM, the data in DDR SDRAM be read using the mode with read lock, including L2P
Table, therefore obtain and read in a manner of making solid state hard disk whether be allowed a choice with read lock, further improve the embodiment of the present application
Flexibility and practicability.
The method for reading data in the embodiment of the present application is described above, below to consolidating in the embodiment of the present application
State hard disk is described, referring to Fig. 3, Fig. 3 is an embodiment of solid state hard disk in the embodiment of the present application.
One embodiment of solid state hard disk includes: in the embodiment of the present application
First recording unit 301 is used for first counter records the first write request number, the first write request number
The write request number sent for the host that the solid state hard disk receives；
Second recording unit 302 is used for second counter records the second write request number, the second write request number
The write request number of write operation is completed for the solid state hard disk；
Receiving unit 303, the read request sent for receiving the host；
Judging unit 304, for judging whether the first write request number and the second write request number are equal；
First reading unit 305, for when determining that the first write request number is equal with the second write request number, then using
The logic in Double Data Rate synchronous DRAM DDR SDRAM is read to physical address translations without the mode of read lock
L2P table.
In the present embodiment, solid state hard disk further include:
Second reading unit 306, for when determining that the first write request number and the second write request number are unequal, then making
The L2P table is read with the mode with read lock.
In the present embodiment, the second reading unit 306 is specifically used for the DDR SDRAM application read lock；Obtain the DDR
The read lock of SDRAM authorization；The L2P table is read using the mode with read lock.
In the present embodiment, solid state hard disk further include:
Releasing unit 307, for discharging the read lock in the DDR SDRAM.
In the embodiment of the present application, since receiving unit 303 is after the read request for receiving host transmission, it can use and sentence
Second recorded in the first write request number and the second recording unit 302 recorded in disconnected 304 first recording unit 301 of unit is write
It requests number whether identical, if it is determined that unit 304 determines that the first write request number is identical as the second write request number, then shows
The write request not completed in solid state hard disk, in such cases, the first reading unit 305 can be used not locking mode and read
The data in DDR SDRAM are taken, including L2P data, thus can read DDR without using the second reading unit 306
Data in SDRAM reduce the number of access DDR SDRAM, save the time of access DDR SDRAM, it is hard to reduce solid-state
The delay of the data input and output of disk, to improve the reading performance of solid state hard disk.
It is the description to an embodiment of solid state hard disk in the embodiment of the present application above, below to the embodiment of the present application
The another embodiment of middle solid state hard disk is described.
Referring to fig. 4, Fig. 4 is another embodiment schematic diagram of solid state hard disk in the embodiment of the present application.
The solid state hard disk 400 can generate bigger difference because configuration or performance are different, may include one or one
The above controller (central processing units, CPU) 401 (for example, one or more processors) and storage
Device 405 is stored with one or more application program or data in the memory 405.
Wherein, memory 405 can be volatile storage or persistent storage.The program for being stored in memory 405 can wrap
One or more modules are included, each module may include to the series of instructions operation in server.Further, it controls
Device 401 processed can be set to communicate with memory 405, and the series of instructions behaviour in memory 405 is executed in solid state hard disk 400
Make.
Solid state hard disk 400 can also include one or more power supplys 402, one or more wired or wireless nets
Network interface 403, one or more input/output interfaces 404, and/or, one or more operating systems, such as
Windows ServerTM, Mac OS XTM, UnixTM, LinuxTM, FreeBSDTM etc..
It should be noted that the storage hard disk of SATA interface can be used in the memory 405 in the present embodiment, specifically herein
Without limitation.In addition, the solid state hard disk 400 in the present embodiment can be not provided with power-down protection apparatus, and can only setting one
Controller 401, specifically herein without limitation.
In process performed by controller 401 in the present embodiment in solid state hard disk 400 and aforementioned embodiment shown in Fig. 2
The method flow of description is similar, and details are not described herein again.
The beneficial effect of the present embodiment is due to making in the case where controller 401 determines the write request not completed
With reading L2P table without reading the mode, therefore controller 401 is without reading L2P table and then secondary access DDR
SDRAM discharges read lock, can thus reduce the number that controller 401 accesses DDR SDRAM, saves access DDR SDRAM
Time, reduce the delay of 404 inputoutput data of input/output interface, to improve the reading performance of solid state hard disk.
It is apparent to those skilled in the art that for convenience and simplicity of description, the system of foregoing description,
The specific work process of device and unit, can refer to corresponding processes in the foregoing method embodiment, and details are not described herein.
In several embodiments provided herein, it should be understood that disclosed system, device and method can be with
It realizes by another way.For example, the apparatus embodiments described above are merely exemplary, for example, the unit
It divides, only a kind of logical function partition, there may be another division manner in actual implementation, such as multiple units or components
It can be combined or can be integrated into another system, or some features can be ignored or not executed.Another point, it is shown or
The mutual coupling, direct-coupling or communication connection discussed can be through some interfaces, the indirect coupling of device or unit
It closes or communicates to connect, can be electrical property, mechanical or other forms.
The unit as illustrated by the separation member may or may not be physically separated, aobvious as unit
The component shown may or may not be physical unit, it can and it is in one place, or may be distributed over multiple
In network unit.It can select some or all of unit therein according to the actual needs to realize the mesh of this embodiment scheme
's.
It, can also be in addition, each functional unit in each embodiment of the application can integrate in one processing unit
It is that each unit physically exists alone, can also be integrated in one unit with two or more units.Above-mentioned integrated list
Member both can take the form of hardware realization, can also realize in the form of software functional units.
If the integrated unit is realized in the form of SFU software functional unit and sells or use as independent product
When, it can store in a computer readable storage medium.Based on this understanding, the technical solution of the application is substantially
The all or part of the part that contributes to existing technology or the technical solution can be in the form of software products in other words
It embodies, which is stored in a storage medium, including some instructions are used so that a computer
Equipment (can be personal computer, server or the network equipment etc.) executes the complete of each embodiment the method for the application
Portion or part steps.And storage medium above-mentioned includes: USB flash disk, mobile hard disk, read-only memory (ROM, Read-Only
Memory), random access memory (RAM, Random Access Memory), magnetic or disk etc. are various can store journey
The medium of sequence code.
Claims (10)
1. a kind of method for reading data of solid state hard disk characterized by comprising
First counter records the first write request number of solid state hard disk, the first write request number are that the solid state hard disk connects
The write request number that the host received is sent；
Second counter records the second write request number of the solid state hard disk, the second write request number are that the solid-state is hard
The write request number of disk completion write operation；
The solid state hard disk receives the read request that the host is sent；
The solid state hard disk judges whether the first write request number and the second write request number are equal；
If so, the mode that the solid state hard disk is used without read lock reads Double Data Rate synchronous DRAM DDR
Logic in SDRAM is to physical address translations L2P table.
2. the method according to claim 1, wherein judging the first write request number and the in the solid state hard disk
After whether two write request numbers are equal, the method also includes:
If it is not, then the solid state hard disk uses the mode with read lock to read the L2P table.
3. according to the method described in claim 2, the solid state hard disk reads the L2P table using the mode with read lock includes:
The solid state hard disk is to the DDR SDRAM application read lock；
The solid state hard disk obtains the read lock of the DDR SDRAM authorization；
The solid state hard disk reads the L2P table using the mode with read lock.
4. according to the method in claim 2 or 3, which is characterized in that read in the solid state hard disk using the mode with read lock
After taking the L2P table, the method also includes:
The solid state hard disk discharges the read lock in the DDR SDRAM.
5. a kind of solid state hard disk characterized by comprising
Controller, memory, input-output equipment and bus；
The controller, memory, input-output equipment are connected with the bus respectively；
The controller is for executing following steps:
With first counter records the first write request number, the first write request number is the master that the solid state hard disk receives
The write request number that machine is sent；With second counter records the second write request number, the second write request number is described solid
The write request number of state hard disk completion write operation；Receive the read request that the host is sent；Judge the first write request number and the
Whether two write request numbers are equal；If so, the mode for being used without read lock reads Double Data Rate synchronous DRAM
Logic in DDR SDRAM is to physical address translations L2P table.
6. solid state hard disk according to claim 5, which is characterized in that the controller is also used to determine the when solid state hard disk
When one write request number and the second write request number are unequal, then the mode with read lock is used to read the L2P table.
7. solid state hard disk according to claim 6, which is characterized in that the controller is specifically used for the DDR
SDRAM application read lock；Obtain the read lock of the DDR SDRAM authorization；The L2P table is read using the mode with read lock.
8. solid state hard disk according to claim 6 or 7, which is characterized in that the controller is also used to discharge the DDR
Read lock in SDRAM.
9. a kind of computer program product comprising instruction, which is characterized in that when run on a computer, so that the meter
Calculation machine executes method according to any one of claims 1 to 4.
10. a kind of computer readable storage medium, which is characterized in that including instruction, when described instruction is run on computers,
So that computer executes method according to any one of claims 1 to 4.
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| CN201810831053.6A CN109032522B (en) | 2018-07-25 | 2018-07-25 | Data reading method of solid state disk and solid state disk |
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| CN201810831053.6A CN109032522B (en) | 2018-07-25 | 2018-07-25 | Data reading method of solid state disk and solid state disk |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111261206A (en) * | 2020-01-17 | 2020-06-09 | 苏州浪潮智能科技有限公司 | Read-write method and device, electronic equipment and readable storage medium |
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| CN109032522B (en) | 2021-06-29 |
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