WO2020155552A1 - 一种基于地址映射的单盘多用户物理隔离方法 - Google Patents

一种基于地址映射的单盘多用户物理隔离方法 Download PDF

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WO2020155552A1
WO2020155552A1 PCT/CN2019/094371 CN2019094371W WO2020155552A1 WO 2020155552 A1 WO2020155552 A1 WO 2020155552A1 CN 2019094371 W CN2019094371 W CN 2019094371W WO 2020155552 A1 WO2020155552 A1 WO 2020155552A1
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address
user
logical address
logical
hard disk
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张乾坤
姜向阳
秦法林
于佑飞
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山东华芯半导体有限公司
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    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F12/00—Accessing, addressing or allocating within memory systems or architectures
    • G06F12/02—Addressing or allocation; Relocation
    • 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
    • G06F21/60—Protecting data
    • G06F21/62—Protecting access to data via a platform, e.g. using keys or access control rules

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  • the invention relates to a single-disk multi-user physical isolation method based on address mapping, and belongs to the technical field of memory.
  • the technical problem to be solved by the present invention is to provide a single-disk multi-user physical isolation method based on address mapping, which can realize the physical isolation of data between different users, and virtualize multiple hard disks into multiple hard disks through address mapping. Data of different users cannot be mutually accessed and modified, which improves the privacy and reliability of data between different users.
  • the technical solution adopted by the present invention is: a single disk multi-user physical isolation method based on address mapping, including logical address management and logical address mapping, logical address management is to manage hard disk storage according to user conditions
  • Unit allocation is realized by dividing the hard disk storage unit into a series of consecutive logical address blocks. In the initial state, all logical address blocks are marked as unused. When a new user is added to the hard disk, the logical address blocks will be divided. Assign to the user and mark the assigned logical address block as used.
  • logical address mapping converts the logical storage address of the user accessed by the host into the logical storage of the hard disk Address
  • the realization method is to establish an address mapping table.
  • the address mapping table stores the address offset between the user logical storage address and the hard disk logical storage address.
  • the offset address is queried from the mapping table , Convert the user logical address to the hard disk logical address.
  • the logical address management of the hard disk is carried out through the method of bitmap marking.
  • the number of bits in the bitmap is equal to the number of logical address blocks divided by the hard disk storage unit. 1 in the bitmap indicates that the logical address block is used, and 0 indicates that the logical address block is not used; when adding a user ,
  • the hard disk queries the remaining space of the current hard disk through the value of the bitmap variable. If the remaining space can meet the user’s allocation needs, the value of the corresponding address block will be marked as used in the bitmap variable, and the user’s information and its occupation
  • the logical address block is saved to the specified location in the hard disk.
  • a set of address mapping table of its own is established. The process is: when the hard disk is powered on, read the logical address block of the current user according to the information of the currently logged in user. Location and quantity, according to the location and quantity of the logical address block, calculate the logical address block corresponding to the current user on the hard disk, and then construct the logical address mapping table according to the logical address block. For consecutive address blocks, multiple blocks can be mapped Value merging, for scattered address blocks, while establishing the mapping table, record the logical addresses that do not contact the edge of the address block. The edge logical addresses of the discontinuous address blocks are called singularity logical addresses.
  • the hard disk adds a corresponding address offset according to the mapping table. If the accessed logical address crosses the discontinuous logical address block, that is, in the continuous logical address accessed Contains the singularity logical address. The hard disk divides the access instruction at the singularity logical address, maps the logical addresses on both sides of it, and then returns the operation result.
  • the solution uses address mapping to manage user partitions, which can realize the physical isolation of data between different users.
  • a single hard disk is virtualized into multiple hard disks through address mapping, and different user data cannot be mutually accessed and modified, which improves the privacy and reliability of data between different users.
  • Each user's space can be regarded as a separate disk, and different users can install their own operating systems without interfering with each other. Because each user's disk is independent, independent hard disk partitioning can be used, and MBR and GPT partitioning methods can coexist between each user.
  • Figure 1 is a schematic diagram of user space allocation
  • Figure 2 is a schematic diagram of hard disk space management
  • Figure 3 is a schematic diagram of a mapping table corresponding to user logical addresses.
  • This embodiment discloses a single-disk multi-user physical isolation method based on address mapping.
  • the method includes two parts: logical address management and logical address mapping.
  • Logical address management manages the allocation of hard disk storage units according to the user's situation.
  • the hard disk allocates sufficient space from the unused space of the hard disk to the user according to the user's capacity requirements, and marks the allocated space as used.
  • a user deletes first delete the user's data, then delete the user information from the hard disk, and mark the storage address occupied by it as available for subsequent distribution.
  • Logical address management is implemented by dividing the hard disk storage unit into a series of continuous logical address blocks. In the initial state, all logical address blocks are marked as unused. When a new user is added to the hard disk, the logical address blocks will be divided. Assign to the user and mark the allocated logical address block as used. When the user is deleted, the logical address occupied by the user is released and marked as unused.
  • the logical address management of the hard disk is carried out through the method of bitmap marking, the number of bits of the bitmap is equal to the number of logical address blocks divided by the hard disk storage unit, 1 in the bitmap indicates that the logical address block is used, and 0 indicates not used; add For users, the hard disk queries the remaining space of the current hard disk through the value of the bitmap variable. If the remaining space can meet the user’s allocation needs, the value of the corresponding address block is marked as used in the bitmap variable, and the user’s information and The logical address block it occupies is saved to the specified location in the hard disk.
  • a 2TB hard disk is divided into multiple consecutive logical address blocks in units of 5GB.
  • the storage space is allocated to users in units of logical address blocks.
  • user 1 has allocated storage space of 4 logical address blocks
  • user 2 has allocated storage space of 6 logical address blocks. Select a specified number of logical address blocks in the unallocated space to the user.
  • the hard disk will erase the user space to be deleted, mark the address block returned by the user as available in the bitmap variable for the next allocation, and erase the user information retained by the user in the hard disk .
  • each hard disk has only the capacity allocated by the user from the perspective of the operating system, the access instructions of the operating system are all assigned user logical addresses instead of the actual hard disk logical storage addresses. Therefore, the user logic of the host access is required.
  • the storage address is converted to the logical storage address of the hard disk, and the logical address mapping is to complete this function.
  • the logical address mapping is realized by establishing an address mapping table.
  • the address mapping table stores the address offset between the user's logical storage address and the hard disk logical storage address. When the host sends a command to access the user's logical address, the offset is queried from the mapping table. Shift address, convert user logical address into hard disk logical address.
  • each user establishes his own address mapping table when the hard disk is powered on and initialized.
  • the process is: when the hard disk is powered on, read the logical address owned by the current user according to the currently logged-in user information According to the location and quantity of the logical address block, calculate the logical address block corresponding to the current user on the hard disk according to the position and quantity of the logical address block, and then construct the logical address mapping table according to the logical address block.
  • For consecutive address blocks multiple blocks can be
  • the logical address of the edge of the discontinuous address block is recorded while the mapping table is established.
  • the edge logical address of the discontinuous address block is called the singular point logical address.
  • the hard disk When the address accessed by the operating system falls in a continuous address block, the hard disk adds a corresponding address offset according to the mapping table. If the accessed logical address crosses a discontinuous logical address block, that is, the accessed continuous logical address contains a singularity Logical address, the hard disk divides the access instruction at the singularity logical address, maps the logical addresses on both sides of it, and then returns the operation result.
  • mapping table corresponding to the slashed logical address block.
  • the first three logical address blocks are continuous, and their corresponding mapping values offset1, offset2, and offset3 can be combined.
  • the fourth block is different from the first three. Continuous, record the logical address of the edge of the discontinuous address block.
  • the hard disk described in this method needs to be used with a special management tool, and the management tool mainly provides the functions of user management and user login status modification.
  • User management mainly has the following functions:
  • the login status management mainly has the following functions:
  • This solution uses address mapping to manage user partitions, which can achieve physical isolation of data between different users.
  • a single hard disk is virtualized into multiple hard disks through address mapping, and different user data cannot be mutually accessed and modified, which improves the privacy and reliability of data between different users.
  • Each user's space can be regarded as a separate disk, and different users can install their own operating systems without interfering with each other. Because each user's disk is independent, independent hard disk partitioning can be used, and MBR and GPT partitioning methods can coexist between each user.
  • This solution can cooperate with the encryption algorithm to encrypt the data content of each user.
  • Each user's information contains an encryption key, which is used to encrypt the user data, further ensuring the privacy and data of each user. Security and reliability.

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Abstract

本发明公开一种基于地址映射的单盘多用户物理隔离方法，将硬盘存储单元分为一系列连续的逻辑地址块，初始状态下所有的逻辑地址块都被标记为未使用，当硬盘上添加新用户后，将划分的逻辑地址块分配给用户并将已分配的逻辑地址块标记为已用，当删除用户时将用户占有的逻辑地址释放，标记为未使用；并建立地址映射表，当主机下发命令访问用户地址地址的时候从映射表内查询偏移地址，将用户逻辑地址转换为硬盘逻辑地址。本发明通过地址映射的方式将多个硬盘虚拟化为多个硬盘，不同用户数据之间不能相互访问修改，提高不同用户之间数据的私密性和可靠性。

Description

一种基于地址映射的单盘多用户物理隔离方法 技术领域
本发明涉及一种基于地址映射的单盘多用户物理隔离方法，属于存储器技术领域。
背景技术
在一些公用计算机或专用存储介质中会存在多人共享单个硬盘的现象，这种情况下，每个使用该盘的用户私密数据就可能会发生泄漏，如果受限于共享硬盘的数量，我们就会希望在单个硬盘上可以为每个用户分配独立的空间，既保证硬盘的共享，又能够保证数据的私密性。
此外单盘多操作系统会共用同一个引导分区，而且一个系统中对磁盘发生不恰当的操作可能会影响整个盘上所有的数据，危害数据安全，如果能够实现数据的物理隔离将会大大提高不同操作系统间数据的安全性，防止误操作对其他操作系统的数据造成影响。
发明内容
本发明要解决的技术问题是提供一种基于地址映射的单盘多用户物理隔离方法，可以实现不同用户之间数据的物理隔离，通过地址映射的方式将多个硬盘虚拟化为多个硬盘，不同用户数据之间不能相互访问修改，提高不同用户之间数据的私密性和可靠性。
为了解决所述技术问题，本发明采用的技术方案是：一种基于地址映射的单盘多用户物理隔离方法，包括逻辑地址管理和逻辑地址映射两部分，逻辑地址管理是根据用户情况管理硬盘存储单元的分配，实现方式是将硬盘存储单元分为一系列连续的逻辑地址块，初始状态下所有的逻辑地址块都被标记为未使用，当硬盘上添加新用户后，将划分的逻辑地址块分配给用户并将已分配的逻辑地址块标记为已用，当删除用户时将用户占有的逻辑地址释放，标记为未使用；逻辑地址映射将主机访问的用户逻辑存储地址转换为硬盘的逻辑存储地址，实现方式是建立地址映射表，地址映射表内存储用户逻辑存储地址与硬盘逻辑存储地址之间的地址偏移，当主机下发命令访问用户逻辑地址的时候从映射表内查询偏移地址，将用户逻辑地址转换为硬盘逻辑地址。
进一步的，通过位图标记的方法进行硬盘逻辑地址管理，位图的位数等于硬盘存储单元划分的逻辑地址块数，位图的1表示逻辑地址块已用，0表示未使用；添加用户时，硬盘通过位图变量的值查询当前硬盘的剩余空间，如果剩余空间能够满足用户的分配需求，就在位图变量中将对应地址块的值标记为已用，同时将用户的信息及其占有的逻辑地址块保存到硬盘中指定的位置。
进一步的，为用户分配逻辑块时，优先分配连续的块，如果连续的块不能满足用户的容量需求，则把零散的逻辑地址块分配给用户，通过给每位用户分配相同空间或分配空间与上次删除空间相等方式避免零散的地址块对读写操作性能的影响。
进一步的，针对每个用户在硬盘上电初始化的时候都建立一套属于自己的地址映射表，过程为：硬盘上电时根据当前登录的用户信息，读取当前用户所拥有的逻辑地址块的位置和数量，根据逻辑地址块的位置和数量计算出当前用户在硬盘上对应的逻辑地址块，然后根据逻辑地址块构建出逻辑地址映射表，对于连续的地址块，可以将多个块的映射值合并，对于分散的地址块，在建立映射表的同时，记录下不联系地址块边缘的逻辑地址，不连续地址块的边缘逻辑地址称为奇点逻辑地址。
进一步的，当操作系统访问的地址落在连续的地址块中时，硬盘根据映射表添加相应的地址偏移，如果访问的逻辑地址跨越不连续的逻辑地址块时，即访问的连续逻辑地址中包含奇点逻辑地址，硬盘在奇点逻辑地址对访问指令进行分割，对其两侧的逻辑地址分别进行映射，然后把操作结果返回。
本发明的有益效果：本方案采用地址映射的方式管理用户分区，可以实现不同用户之间数据的物理隔离。通过地址映射的方式将单个硬盘虚拟化为多个硬盘，不同用户数据之间不能相互访问修改，提高不同用户之间数据的私密性和可靠性。
本方案对于多系统管理更加方便。每个用户的空间都可以看做一个单独的盘，不同的用户可以安装各自的操作系统，互不干扰。因为每个用户的磁盘是独立的，因此可以采用独立的硬盘分区方式，每个用户之间MBR和GPT分区方式是可以共存的。
附图说明
图1为用户空间分配示意图；
图2为硬盘空间管理示意图；
图3为用户逻辑地址对应映射表的示意图。
具体实施方式
下面结合附图和具体实施例对本发明作进一步的说明。
实施例1
本实施例公开一种基于地址映射的单盘多用户物理隔离方法，本方法包括逻辑地址管理和逻辑地址映射两部分。
逻辑地址管理是根据用户情况管理硬盘存储单元的分配，当添加用户时，硬盘根据用户的容量需求从硬盘的未使用空间中分配足够的空间给用户，同时将已分配的空间标记为 已用。当用户删除时，首先删除用户的数据，然后将用户信息从硬盘中删除，将其占用的存储地址标记为可用，供后续分配使用。
逻辑地址管理的实现方式是将硬盘存储单元分为一系列连续的逻辑地址块，初始状态下所有的逻辑地址块都被标记为未使用，当硬盘上添加新用户后，将划分的逻辑地址块分配给用户并将已分配的逻辑地址块标记为已用，当删除用户时将用户占有的逻辑地址释放，标记为未使用。本实施例中，通过位图标记的方法进行硬盘逻辑地址管理，位图的位数等于硬盘存储单元划分的逻辑地址块数，位图的1表示逻辑地址块已用，0表示未使用；添加用户时，硬盘通过位图变量的值查询当前硬盘的剩余空间，如果剩余空间能够满足用户的分配需求，就在位图变量中将对应地址块的值标记为已用，同时将用户的信息及其占有的逻辑地址块保存到硬盘中指定的位置。
为用户分配逻辑块时，优先分配连续的块，如果连续的块不能满足用户的容量需求，则把零散的逻辑地址块分配给用户，通过给每位用户分配相同空间或分配空间与上次删除空间相等方式避免零散的地址块对读写操作性能的影响。
如图2所示，本实施例中将2TB的硬盘以5GB为单元划分成了多个连续的逻辑地址块，逻辑地址块的个数为2*1024/5＝410个，使用52字节的位图变量就可以管理整个硬盘。向用户分配存储空间时以逻辑地址块为单位，如图2中，用户1分配了4个逻辑地址块的存储空间，用户2分配了6个逻辑地址块的存储空间，新增用户时，从未分配空间内选择规定个数的逻辑地址块给用户。当需要删除用户时，硬盘会对将要删除的用户空间进行擦除，在位图变量中将用户归还的地址块标记为可用，供下次分配使用，并且擦除用户在硬盘中保留的用户信息。
因为每个硬盘从操作系统的角度来看只有用户分配的容量大小，操作系统的访问指令中都是分配后的用户逻辑地址，而不是实际的硬盘逻辑存储地址，因此需要将主机访问的用户逻辑存储地址转换为硬盘的逻辑存储地址，逻辑地址映射就是完成此功能的。逻辑地址映射的实现方式是建立地址映射表，地址映射表内存储用户逻辑存储地址与硬盘逻辑存储地址之间的地址偏移，当主机下发命令访问用户逻辑地址的时候从映射表内查询偏移地址，将用户逻辑地址转换为硬盘逻辑地址。
本实施例中，针对每个用户在硬盘上电初始化的时候都建立一套属于自己的地址映射表，过程为：硬盘上电时根据当前登录的用户信息，读取当前用户所拥有的逻辑地址块的位置和数量，根据逻辑地址块的位置和数量计算出当前用户在硬盘上对应的逻辑地址块，然后根据逻辑地址块构建出逻辑地址映射表，对于连续的地址块，可以将多个块的映射值合 并，对于分散的地址块，在建立映射表的同时，记录下不连续地址块边缘的逻辑地址，不连续地址块的边缘逻辑地址称为奇点逻辑地址。
当操作系统访问的地址落在连续的地址块中时，硬盘根据映射表添加相应的地址偏移，如果访问的逻辑地址跨越不连续的逻辑地址块时，即访问的连续逻辑地址中包含奇点逻辑地址，硬盘在奇点逻辑地址对访问指令进行分割，对其两侧的逻辑地址分别进行映射，然后把操作结果返回。
如图3所示，为斜线部分逻辑地址块对应的映射表，其中前3个逻辑地址块为连续，它们对应的映射值offset1、offset2、offset3可以合并，第4个块与前3个不连续，记录下不连续地址块边缘的逻辑地址。
本方法所述硬盘需要配合专门的管理工具使用，管理工具主要提供了用户管理和用户登录状态修改的功能。
用户管理主要有以下功能：
1.添加用户。将用户信息存储到硬盘上，用于用户空间分配，登录验证，用户容量显示和地址偏移映射表建立以及其他用户可定制的功能。
2.删除用户。当需要把已分配的用户空间归还给硬盘时，可以使用用户管理工具删除用户数据和信息。
3.修改用户信息。当用户保存在硬盘中的信息需要修改时，使用用户管理工具对已经保存的信息进行修改。
登录状态管理主要有以下功能：
1.用户临时登录。临时登录到硬盘，当硬盘重新上电时，硬盘恢复默认状态。
2.用户永久登录。永久登录到硬盘，当硬盘重新上电时，硬盘保持登录状态不变。
3.恢复默认登录状态。当需要把硬盘恢复到默认登录状态时，使用该功能将硬盘恢复默认状态。
本方案采用地址映射的方式管理用户分区，可以实现不同用户之间数据的物理隔离。通过地址映射的方式将单个硬盘虚拟化为多个硬盘，不同用户数据之间不能相互访问修改，提高不同用户之间数据的私密性和可靠性。
本方案对于多系统管理更加方便。每个用户的空间都可以看做一个单独的盘，不同的用户可以安装各自的操作系统，互不干扰。因为每个用户的磁盘是独立的，因此可以采用独立的硬盘分区方式，每个用户之间MBR和GPT分区方式是可以共存的。
本方案可以配合加密算法对每个用户的数据内容进行加密，每个用户的信息中都包含一段加密密钥，用于对用户数据的加密，进一步保证每个用户之间数据的私密性和数据安全的可靠性。
以上描述的仅是本发明的基本原理和优选实施例，本领域技术人员根据本发明做出的改进和替换，属于本发明的保护范围。

Claims (5)

  1. 一种基于地址映射的单盘多用户物理隔离方法，其特征在于：包括逻辑地址管理和逻辑地址映射两部分，逻辑地址管理是根据用户情况管理硬盘存储单元的分配，实现方式是将硬盘存储单元分为一系列连续的逻辑地址块，初始状态下所有的逻辑地址块都被标记为未使用，当硬盘上添加新用户后，将划分的逻辑地址块分配给用户并将已分配的逻辑地址块标记为已用，当删除用户时将用户占有的逻辑地址释放，标记为未使用；逻辑地址映射将主机访问的用户逻辑存储地址转换为硬盘的逻辑存储地址，实现方式是建立地址映射表，地址映射表内存储用户逻辑存储地址与硬盘逻辑存储地址之间的地址偏移，当主机下发命令访问用户地址地址的时候从映射表内查询偏移地址，将用户逻辑地址转换为硬盘逻辑地址。
  2. 根据权利要求1所述的基于地址映射的单盘多用户物理隔离方法，其特征在于：通过位图标记的方法进行硬盘逻辑地址管理，位图的位数等于硬盘存储单元划分的逻辑地址块数，位图的1表示逻辑地址块已用，0表示未使用；添加用户时，硬盘通过位图变量的值查询当前硬盘的剩余空间，如果剩余空间能够满足用户的分配需求，就在位图变量中将对应地址块的值标记为已用，同时将用户的信息及其占有的逻辑地址块保存到硬盘中指定的位置。
  3. 根据权利要求2所述的基于地址映射的单盘多用户物理隔离方法，其特征在于：为用户分配逻辑块时，优先分配连续的块，如果连续的块不能满足用户的容量需求，则把零散的逻辑地址块分配给用户，通过给每位用户分配相同空间或分配空间与上次删除空间相等方式避免零散的地址块对读写操作性能的影响。
  4. 根据权利要求1所述的基于地址映射的单盘多用户物理隔离方法，其特征在于：针对每个用户在硬盘上电初始化的时候都建立一套属于自己的地址映射表，过程为：硬盘上电时根据当前登录的用户信息，读取当前用户所拥有的逻辑地址块的位置和数量，根据逻辑地址块的位置和数量计算出当前用户在硬盘上对应的逻辑地址块，然后根据逻辑地址块构建出逻辑地址映射表，对于连续的地址块，可以将多个块的映射值合并，对于分散的地址块，在建立映射表的同时，记录下不联系地址块边缘的逻辑地址，不连续地址块的边缘逻辑地址称为奇点逻辑地址。
  5. 根据权利要求4所述的基于地址映射的单盘多用户物理隔离方法，其特征在于：当操作系统访问的地址落在连续的地址块中时，硬盘根据映射表添加相应的地址偏移，如果访问的逻辑地址跨越不连续的逻辑地址块时，即访问的连续逻辑地址中包含奇点逻辑地址，硬盘在奇点逻辑地址对访问指令进行分割，对其两侧的逻辑地址分别进行映射，然后把操作结果返回。
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