CN110276216A - Data guard method - Google Patents
Data guard method Download PDFInfo
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- CN110276216A CN110276216A CN201910438120.2A CN201910438120A CN110276216A CN 110276216 A CN110276216 A CN 110276216A CN 201910438120 A CN201910438120 A CN 201910438120A CN 110276216 A CN110276216 A CN 110276216A
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F21/00—Security arrangements for protecting computers, components thereof, programs or data against unauthorised activity
- G06F21/70—Protecting specific internal or peripheral components, in which the protection of a component leads to protection of the entire computer
- G06F21/71—Protecting specific internal or peripheral components, in which the protection of a component leads to protection of the entire computer to assure secure computing or processing of information
- G06F21/74—Protecting specific internal or peripheral components, in which the protection of a component leads to protection of the entire computer to assure secure computing or processing of information operating in dual or compartmented mode, i.e. at least one secure mode
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F21/00—Security arrangements for protecting computers, components thereof, programs or data against unauthorised activity
- G06F21/70—Protecting specific internal or peripheral components, in which the protection of a component leads to protection of the entire computer
- G06F21/78—Protecting specific internal or peripheral components, in which the protection of a component leads to protection of the entire computer to assure secure storage of data
- G06F21/79—Protecting specific internal or peripheral components, in which the protection of a component leads to protection of the entire computer to assure secure storage of data in semiconductor storage media, e.g. directly-addressable memories
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2221/00—Indexing scheme relating to security arrangements for protecting computers, components thereof, programs or data against unauthorised activity
- G06F2221/21—Indexing scheme relating to G06F21/00 and subgroups addressing additional information or applications relating to security arrangements for protecting computers, components thereof, programs or data against unauthorised activity
- G06F2221/2149—Restricted operating environment
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- Computer Hardware Design (AREA)
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- Computer Security & Cryptography (AREA)
- Physics & Mathematics (AREA)
- Software Systems (AREA)
- General Engineering & Computer Science (AREA)
- General Physics & Mathematics (AREA)
- Mathematical Physics (AREA)
- Storage Device Security (AREA)
Abstract
The present invention provides a kind of data guard method; it is applied on a data memory device; data memory device includes a controller and a plurality of flash memories; flash memory is formed with a region of data storage; when user be intended to for a specific data is protected in data memory device when; through one write-in filter command of host transmission to data memory device, a write-in filter is executed according to write-in filter command after the controller reception write-in filter command of data memory device；When filter execution is written; controller marks off at least one first cut section and one second cut section from region of data storage; and set the read-only region that the first cut section is moved as a forbidden data, then, stored specific data will forbid being moved and being protected in the first cut section.
Description
Technical field
The present invention is espespecially a kind of for certain number stored in data memory device about a kind of data guard method
According to the method protected.
Background technique
A write-protect filter functionality in previous solid state hard disk (SSD) Chang Liyong Microsoft embedded system, such as EWF
(Enhanced Write Filter), it is non-writable state that cut section specific for one, which is worked out, to avoid specific segmentation
Significant data in area, such as operating system data are capped or distort.
Furthermore SSD hard disk often needs to carry out garbage reclamation to allow operation performance to can achieve optimal efficiency
(Garbage Collection, GC) and abrasion equilibration (Wear Leveling, WL) etc. processing.SSD hard disk execute GC and
When WL processing, in addition to for general cut section carry out data move it is outer, also can for work out be can not write state it is specific
Cut section carries out the movement of data-moving, so that each block in SSD hard disk can be used fifty-fifty.Such as: it is not writeable
When entering the specific cut section progress data-moving of state, the logical block addresses in cut section will not be changed, when wherein
Data in its affiliated block of physical blocks address pointed by one logical block addresses moved because of GC or WL processing routine to
When in another affiliated block in physical blocks address, logical block addresses will be directed toward another physical blocks address.However, moving number
During, once encountering abnormal situation, electric voltage exception is such as powered off or operates, there are the risks of damage for data.If
The data moved occur to damage and the operating system data in exactly specific cut section, it will cause computer system without
Method normal switch.
Summary of the invention
A purpose of the invention is to propose a kind of data guard method, apply on a data memory device, data
Storage device includes a controller and a plurality of flash memories, and flash memory is formed with a region of data storage, when user is intended to for data storage
When a specific data is protected in device, through one write-in filter command of host transmission to data memory device, data storage
The controller of cryopreservation device executes a write-in filter according to write-in filter command；Be written filter execute when, controller from
At least one first cut section and one second cut section are marked off in region of data storage, and set the first cut section as a forbidden data
The read-only region moved and be written；Then, a forbidden data is worked out in the region of data storage of data memory device to move and be written
Read-only region, the specific data being stored in read-only region will can avoid generating because moving damage or because by the write-in of other data
The risk of covering and loss.
To reach above-mentioned purpose, the present invention provides a kind of data guard method, applies on a data memory device, data
The step of storage device includes a controller and a plurality of flash memories, and flash memory is formed with a region of data storage, data guard method is wrapped
It includes: one write-in filter command of transmission to data memory device；The controller of data memory device is enabled to be held according to write-in filter command
The step of filter is written in row one, and filter is written includes: that at least one first cut section is cut into from region of data storage
And one second cut section；And set the read-only region that the first cut section is moved and is written as a forbidden data.
In one embodiment of the invention, the step of setting the read-only region that the first cut section is moved and is written as forbidden data is executed
Further include the steps that having before one from the second cut section moving data to the first cut section.
In one embodiment of the invention, the step of setting the read-only region that the first cut section is moved and is written as forbidden data is executed
Further include the steps that thering is one to write data to the first cut section before.
In one embodiment of the invention, write-in filter command includes the message of a cutting address range, and controller foundation is cut
The message of address range is cut to be cut at least one first cut section from region of data storage.
In one embodiment of the invention, cut section that the first cut section is addressed out by a continuous logical block addresses.
In one embodiment of the invention, the logical block addresses cut section that addresses out of first cut section by a dispersion.
In one embodiment of the invention, when data memory device is operated in a garbage reclamation program or an average loss program
When, the first cut section is prohibited moving or being written for data.
In one embodiment of the invention, write-in filter command is issued by a host.
In one embodiment of the invention, data memory device stores a customized write-in filter functionality, data storage
The controller of cryopreservation device executes write-in filter through customized write-in filter functionality.
In one embodiment of the invention, being syncopated as the first cut section from region of data storage is a blank for not storing data
Sector.
The invention has the advantages that
Data guard method provided by the invention is applied on a data memory device, and data memory device includes one
Controller and a plurality of flash memories, flash memory are formed with a region of data storage, when user is intended to for a certain number in data memory device
When according to being protected, through one write-in filter command of host transmission to data memory device, the controller of data memory device
A write-in filter is executed according to write-in filter command；When filter execution is written, controller is drawn from region of data storage
At least one first cut section and one second cut section are separated, and sets that the first cut section is moved and is written as a forbidden data
Reading area；Then, the read-only region that a forbidden data is moved and is written is worked out in the region of data storage of data memory device, is stored in
Specific data in read-only region will can avoid generating the wind damaged or lost due to being covered by the write-in of other data due to moving
Danger.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of computer system of the present invention.
Fig. 2A is the data structure schematic diagram of one embodiment of flash memory of the present invention.
Fig. 2 B is the data structure schematic diagram of the another embodiment of flash memory of the present invention.
Fig. 3 is the flow chart of data guard method of the present invention.
Specific embodiment
Referring to Fig. 1, being the structural schematic diagram of computer system of the present invention.As shown in Figure 1, computer system of the present invention
100 include that a host 10 and a data memory device 30, host 10 are connect with data memory device 30.User is right using host 10
The protective program of a data is executed in at least specific data 32 being stored in data memory device 30, to ensure specific data
32 integrality.In the present invention, specific data 32 also for an operating system data, an encryption data or other can have importance
Data.
Data memory device 30 is a solid state hard disk (SDD), a memory card or a Portable disk comprising a controller 31,
A plurality of flash memories 33 and data transmission interface 35.Data memory device 30 carries out data through data transmission interface 35 and host 10
Transmission.Flash memory 33 is formed with a region of data storage 37.Region of data storage 37 includes plurality of blocks 370 and a consult table
373(Lookup table).Block 370 is to store data.As shown in 2A figure, consult table 373 includes multiple fields, often
One field has the number of a logical block addresses (Logical Block Address, LBA) and with recording logical blocks respectively
Physical blocks address corresponding to location (LBA) (Physical Block Address, PBA), such as: field (LBA 0765) note
It is loaded with a physical blocks address (PBA 0765), controller 31 can be directed toward physical blocks address via field (LBA 0765)
(PBA 0765) is accessed with the data in the block 370 for physical blocks address (PBA 0765).Implement in the present invention
It is the convenience said for technology solution, the number of logical block addresses (LBA) and the physical blocks address of direction in example
(PBA) number is designed to consistent；However, in the situation of practical application, number and the direction of logical block addresses (LBA)
The number of physical blocks address (PBA) is usually inconsistent.
Connect, data memory device 30 be equipped with a customized write-in filtering (Enhanced Write Filter,
EWF) functional unit 34 can protect the sequencing component of process for an operation data and be stored in region of data storage 37.
Referring to Fig. 3, be data guard method of the present invention flow chart, and arrange in pairs or groups simultaneously refering to fig. 1, Fig. 2A and Fig. 2 B.
When user is intended to carry out the movement of data protection for the specific data 32 in data memory device 30, firstly, such as step S51, it is main
Filter command 101 is written to data memory device 30 in the transmission of machine 10 one.Step S53, data memory device 30 receive write-in filtering
After order 101, the controller 31 of the data memory device 30 EWF functional unit customized according to write-in 101 enable of filter command
34, a write-in filter S55 is executed using customized EWF functional unit 34.
In write-in filter S55, step S551, as shown in Figure 2 A, controller 31 are cut out from region of data storage 37
At least one first cut section 371, and remaining region of data storage 37 will be used as one second cut section 372.Also, from data storage
The blank sector that the first cut section 371 that area 37 is cut out also can not store any data for one.Furthermore the first cut section
371 and second cut section 372 respectively included plurality of blocks 370.Each block 370 with having a corresponding logical blocks respectively
Location (LBA) and a corresponding physical blocks address (PBA).In one embodiment of the invention, write-in filter command 101 includes all
Cut the message 102 of address range, controller 31 is cut into the according to the message 102 of cutting address range from region of data storage 37
One cut section 371, such as: the instruction of message 102 for cutting address range has a logical block addresses range (0770~LBA of LBA
1023), controller 31 is cut into the fan of logical block addresses range (0770~LBA of LBA 1023) from region of data storage 37
Area is as the first cut section 371.In one embodiment of the invention, the first cut section 371 is a continuous logical block addresses range
The cut section addressed out, such as LBA0770~LBA 1023.Alternatively, in further embodiment of this invention, the first cut section 371
The cut section that can be addressed out by the logical block addresses range of a dispersion.
After the first cut section 371 is split out from region of data storage 37, step S553 is executed, as shown in Figure 2 B, control
Device 31 processed moves the specific data 32 in the block 370 for being stored in the second cut section 372 originally to the area of the first cut section 371
In block 370, the specific data 32 in such as block (PBA 0001, PBA 0765, PBA 0766) 370 of the second cut section 372 is removed
It moves in the block (PBA0770, PBA 1021, PBA 1022) 370 of the first cut section 371；Alternatively, outside is written in host 10
In the block (PBA 0770, PBA 1021, PBA 1022) 370 of 32 to the first cut section 371 of specific data.When specific data 32
It moves or is written to the block 370 of the first cut section 371, execute step S555, controller 31 works out the first cut section 371 and is
The read-only region that one forbidden data is moved and is written limits entity pointed by the logical block addresses (LBA) of the first cut section 371
Block address (PBA) and its stored data can not be changed.Later, the running of data memory device 30 is in a garbage reclamation
It, can only be for second when (Garbage Collection, GC) program or an average loss (Wear Leveling, WL) program
370 data of block of cut section 372 are moved and are written, forbid moving data in the block 370 of the first cut section 371 or
Forbid writing data in the block 370 of the first cut section 371, to protect the certain number being stored in the first cut section 371
According to 32.
Then, worked out in the region of data storage 37 of data memory device 30 forbidden data move and be written it is read-only
Area, the specific data 32 being stored in read-only region will can avoid generating because moving and damage or because by the write-in covering of other data
And the risk lost.
The above is present pre-ferred embodiments and its technical principle used, and is come for those skilled in the art
It says, without departing from the spirit and scope of the present invention, any equivalent transformation based on the basis of technical solution of the present invention,
Simple replacement etc. obviously changes, and all falls within the protection scope of the present invention.
Claims (10)
1. a kind of data guard method, which is characterized in that the data guard method is applied on a data memory device, described
Data memory device includes a controller and a plurality of flash memories, and the flash memory is formed with a region of data storage, the data protection
The step of method includes:
Filter command is written to the data memory device in transmission one；
The controller of the data memory device is enabled to execute a write-in filter according to said write filter command, it is described
Be written filter the step of include:
At least one first cut section and one second cut section are cut into from the region of data storage；And
Set the read-only region that first cut section is moved and is written as a forbidden data.
2. data guard method according to claim 1, which is characterized in that execute it is described set first cut section as
Further include before the step of read-only region that the forbidden data is moved and is written have one from the second cut section moving data to
The step of first cut section.
3. data guard method according to claim 1, which is characterized in that execute it is described set first cut section as
It further include thering is one to write data to first cut section before the step of read-only region that the forbidden data is moved and is written
Step.
4. data guard method according to claim 1, which is characterized in that said write filter command includes a cutting
The message of address range, the controller is according to the message for cutting address range to be cut into from the region of data storage
At least one first cut section.
5. data guard method according to claim 1, which is characterized in that first cut section is a continuous logic
The cut section that block address addresses out.
6. data guard method according to claim 1, which is characterized in that first cut section is the logic of a dispersion
The cut section that block address addresses out.
7. data guard method according to claim 1, which is characterized in that when the data memory device is operated in a rubbish
When rubbish reclaimer or an average loss program, first cut section is prohibited moving or being written for data.
8. data guard method according to claim 1, which is characterized in that said write filter command is by a host institute
Publication.
9. data guard method according to claim 1, which is characterized in that it is customized that the data memory device stores one
The controller of the write-in filter functionality of change, the data memory device penetrates the customized write-in filtering function
Component executes said write filter.
10. data guard method according to claim 1, which is characterized in that be syncopated as from the region of data storage
First cut section is a blank sector for not storing data.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910438120.2A CN110276216A (en) | 2019-05-24 | 2019-05-24 | Data guard method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910438120.2A CN110276216A (en) | 2019-05-24 | 2019-05-24 | Data guard method |
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| CN110276216A true CN110276216A (en) | 2019-09-24 |
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| CN201910438120.2A Pending CN110276216A (en) | 2019-05-24 | 2019-05-24 | Data guard method |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101464841A (en) * | 2008-12-31 | 2009-06-24 | 杭州华三通信技术有限公司 | Method and system for implementing write protection of block memory stack |
| CN104516684A (en) * | 2013-09-30 | 2015-04-15 | 瑞萨电子株式会社 | Data processing system, microcontroller and semiconductor device |
| TW201616362A (en) * | 2014-10-31 | 2016-05-01 | 慧榮科技股份有限公司 | Data storage device and flash memory control method |
-
2019
- 2019-05-24 CN CN201910438120.2A patent/CN110276216A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101464841A (en) * | 2008-12-31 | 2009-06-24 | 杭州华三通信技术有限公司 | Method and system for implementing write protection of block memory stack |
| CN104516684A (en) * | 2013-09-30 | 2015-04-15 | 瑞萨电子株式会社 | Data processing system, microcontroller and semiconductor device |
| TW201616362A (en) * | 2014-10-31 | 2016-05-01 | 慧榮科技股份有限公司 | Data storage device and flash memory control method |
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Application publication date: 20190924 |