WO2013097231A1 - Procédé et système d'accès aux fichiers - Google Patents

Procédé et système d'accès aux fichiers Download PDF

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Publication number
WO2013097231A1
WO2013097231A1 PCT/CN2011/085169 CN2011085169W WO2013097231A1 WO 2013097231 A1 WO2013097231 A1 WO 2013097231A1 CN 2011085169 W CN2011085169 W CN 2011085169W WO 2013097231 A1 WO2013097231 A1 WO 2013097231A1
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WO
WIPO (PCT)
Prior art keywords
information
file
key
content
attribute
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Application number
PCT/CN2011/085169
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English (en)
Chinese (zh)
Inventor
张敬亮
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华为技术有限公司
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Publication date
Application filed by 华为技术有限公司 filed Critical 华为技术有限公司
Priority to CN201180003437.5A priority Critical patent/CN102725755B/zh
Priority to PCT/CN2011/085169 priority patent/WO2013097231A1/fr
Publication of WO2013097231A1 publication Critical patent/WO2013097231A1/fr

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    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F16/00—Information retrieval; Database structures therefor; File system structures therefor
    • G06F16/20—Information retrieval; Database structures therefor; File system structures therefor of structured data, e.g. relational data
    • G06F16/24—Querying

Definitions

  • the embodiments of the present invention relate to the field of computer technologies, and in particular, to a file access method and system. Background technique
  • a file system similar to the Portable Operating System Interface for Unix/Linux includes two major parts of metadata and data; wherein the metadata part includes a file node ( Inode ) information that constitutes a specific data structure (such as a multi-way search tree, etc.).
  • the data part includes the file content.
  • the POSIX file system provides a POSIX interface to upper-level applications.
  • Each directory and file in the POSIX file system has a corresponding file node (inode).
  • the file node contains the file size, creation modification access time, permission attribution, and the address information of the file content in the data part.
  • the distribution of the data portion of the file system may be discontinuous and may consist of several different segments in the storage medium.
  • the embodiment of the invention provides a file access method and system, which are used to provide an access scheme for a file system based on a Key-Value database, to improve file access efficiency.
  • An embodiment of the present invention provides a file access method, including:
  • the file system driver module receives the first access request sent by the upper layer application, where the first access request carries the path information and the type of the value information to be accessed; the value information to be accessed Type is content type or attribute type;
  • the file system driver module converts the first access request into a second access request suitable for accessing the key value database according to a correspondence between an access interface corresponding to the upper layer application and an access interface of the key value database; Carrying, in the second access request, the path information and the type of value information to be accessed;
  • the client of the key value database searches for the corresponding file content or directory item content or file attribute or directory item attribute from the key value database stored by the server side of the key value database according to the second access request;
  • the key value database includes key information and two value information corresponding to the key information; the key information includes a path hash value corresponding to the path information; and the types corresponding to the two value information are respectively the content a type and the attribute type, the value information corresponding to the content type includes a file content or a directory item content in a path corresponding to the path information, and the value information corresponding to the attribute type includes the path The file attribute or directory item attribute under the path corresponding to the information.
  • An embodiment of the present invention provides a file access system, including:
  • a file system driving module configured to receive a first access request sent by an upper layer application, where the first access request carries a path information and a type of value information to be accessed; the type of the value information to be accessed is a content type or Attribute type; and converting the first access request into a second access request applicable to accessing the key value database according to the correspondence between the access interface corresponding to the upper layer application and the access interface of the key value database;
  • the second access request carries the path information and the type of the value information to be accessed; and sends the second access request to a client of the key value database;
  • a client of the key value database configured to search, according to the second access request, a corresponding file content, a directory item content, a file attribute, or a directory item attribute from a key value database stored in a server side of the key value database
  • the key value database includes key information and two value information corresponding to the key information; the key information includes a path hash value corresponding to the path information; and the types corresponding to the two value information respectively include The content type and the attribute type, the value information corresponding to the content type includes file content or directory item content in the path corresponding to the path information; and the value information corresponding to the attribute type includes The path The file attribute or directory item attribute under the path corresponding to the information.
  • the file access method and system of the embodiment of the present invention stores a file by using a Key-Value database, where the Key information includes a path hash value corresponding to the path information, and the Value information corresponding to the content type includes the file under the path corresponding to the path information.
  • the value information corresponding to the attribute type includes the file attribute or the directory item attribute in the path corresponding to the path information.
  • FIG. 1 is a flowchart of a file access method according to an embodiment of the present invention.
  • FIG. 2 is a schematic structural diagram of a file access system according to another embodiment of the present invention.
  • FIG. 3 is a schematic structural diagram of a file access system according to another embodiment of the present invention. detailed description
  • a Key-Value database The key difference between a Key-Value database and a relational database is that the data format is not strictly defined.
  • a data definition is a constraint on the data, including the relationship between the data and the integrity of the data.
  • For a Key and its corresponding Value it can be any data type.
  • Key as the only information
  • An identifier, Value as the content of the information.
  • Key-Value storage has greater flexibility and scalability than traditional file system storage. Because there is no directory/path constraint, the structure is flatter and there is no traditional POSIX file system complexity. Metadata information can improve access efficiency.
  • the hash value corresponding to the path information of the file or directory entry is stored in the Key-Value database, and the key-value database is used to replace the traditional POSIX file system.
  • the attribute information of the corresponding file and the content of the file and the attribute information of the directory item and the content of the directory entry are stored in the Value information corresponding to the Key-Value database.
  • the hash value corresponding to the path information calculator of the file to be accessed may be directly obtained, and then the attribute information of the file to be accessed or the content of the file, or the attribute information or directory of the directory item to be accessed may be directly obtained according to the hash value.
  • the content of the item is stored in the Key-Value database, and the key-value database is used to replace the traditional POSIX file system.
  • the attribute information of the corresponding file and the content of the file and the attribute information of the directory item and the content of the directory entry are stored in the Value information corresponding to the Key-Value database.
  • the POSIX file system is used to store files, and the layer-by-layer access is not required according to the path of the file storage, so that the access efficiency of the file can be effectively improved.
  • using the Key-Value database to store files is more scalable. Very flexible and convenient to use.
  • FIG. 1 is a flowchart of a file access method according to an embodiment of the present invention. As shown in FIG. 1, the file access method in this embodiment may specifically include the following steps:
  • the file system driver module receives the first access request sent by the upper layer application.
  • the first access request carries the path information and the type of the Value information to be accessed; the type of the Value information to be accessed is the content type. Or attribute type.
  • the file system driver module converts the first access request into a second access request for accessing the Key-Value database according to the correspondence between the access interface corresponding to the upper application and the access interface of the Key-Value database;
  • the second access request in this embodiment also carries the path information and the type of Value information to be accessed.
  • the file system driver module sends a second access request to a client of the Key-Value database.
  • the client of the Key-Value database receives the number of Key-Values according to the second access request. Find the corresponding file content, directory item content, file attribute or directory item attribute in the Key-Value database stored in the server side of the library.
  • the Key-Value database includes two Value information corresponding to the Key information and the Key information; the Key information includes a path hash value; the types corresponding to the two Value information are respectively a content type and an attribute type, and the content type corresponds to
  • the value information includes the file content or the content of the directory item in the path corresponding to the path information.
  • the value information corresponding to the attribute type includes the file attribute or the directory item attribute in the path corresponding to the path information.
  • the file access method of this embodiment stores a file by using a Key-Value database, where the key information includes a path hash value corresponding to the path information, and the value information corresponding to the content type includes the file content or directory under the path corresponding to the path information. Item content; the value information corresponding to the attribute type includes the file attribute or the directory item attribute in the path corresponding to the path information.
  • the path information is directly obtained according to the path information.
  • the hash value, and the type of Value information to be accessed can directly obtain the corresponding file content or directory item content or file attribute or directory item attribute.
  • the access overhead is small and the access efficiency is high.
  • the client of the Key-Value database of this embodiment may correspond to a server end of multiple Key-Value databases.
  • Searching for the corresponding file content or directory item content or file attribute or directory item attribute in the Key-Value database may include the following steps:
  • the client of the Key-Value database calculates a path hash value of the path information in the second access request
  • the client of the Key-Value database searches for the corresponding file content or the content of the directory item from the Key-Value database stored in the server side of the Key-Value database according to the path hash value and the type of the Value information to be accessed. Or the file attribute or the directory item attribute.
  • the result of the search is file content information or file attributes.
  • the path information further includes multiple sub-paths, and each sub-path further includes a file name
  • the current search includes multiple Subdirectory and directory entry information or directory entry attributes for file names in each subpath.
  • the method may further include: (3) The client of the Key-Value database can access the content to be accessed in the Key-Value database by sending the upper-layer application to the upper-layer application through the file system driver module.
  • the Key information may further include a file name.
  • File attributes and directory item attributes include at least one of size, type, last access time, last modification time, creation time, owner name, owning group name, and permission information.
  • the contents of the directory entry include: the path hash of the subdirectory and/or subfile of the directory entry, the subdirectory of the directory entry, and/or the name of the subfile.
  • the Key information corresponds to two Value information, and Valuel can be used to represent the content of the file or directory item, and Value2 can be used to represent the file attribute or the directory item attribute.
  • the corresponding key information can be as shown in the following Table 1.
  • Valuel is the content of the directory item, as shown in Table 2 below
  • Valuel is the file content
  • Table 3 when Valuel is the file content, it can be as shown in Table 3 below.
  • Value2 represents a file attribute or a directory item attribute, it can be as shown in Table 4 below.
  • Table 2 includes the path hash value, file or directory name of the subfile or subdirectory under the directory, including ".”, two special files, and the hash value corresponding to ".” is the path of the current directory.
  • the hash value corresponds to the upper directory hash value of the directory.
  • Table 4 lists the file attributes or directory item attributes including size, type, last access time, last modification time, creation time, owner name, owning group name, and permission information.
  • the file attribute or the directory item attribute may include at least one of a size, a type, a last access time, a last modification time, a creation time, an owner name, a possession group name, and permission information.
  • the file system driver module may determine a correspondence between an access interface corresponding to the upper application and an access interface of the Key-Value database, so as to implement the upper application and the Key-Value database.
  • the matching of the interface facilitates subsequent implementation of converting the first access request of the upper application into a second access request suitable for accessing the Key-Value database, and implementing access of the upper application to the Key-Value database.
  • the access interface of the upper layer application in this embodiment may be a standard POSIX interface.
  • the file access method of this embodiment stores a file by using a Key-Value database, where the key information includes a path hash value corresponding to the path information, and the value information corresponding to the content type includes the file content or directory under the path corresponding to the path information. Item content; the value information corresponding to the attribute type includes the file attribute or the directory item attribute in the path corresponding to the path information.
  • the path information is directly obtained according to the path information.
  • the Key information may correspond to two Value information.
  • one Key information may be extended to correspond to multiple Value information, for example, different Value information is used to respectively represent Different attributes or types of files.
  • the foregoing storage medium includes: a medium that can store program codes, such as a ROM, a RAM, a magnetic disk, or an optical disk.
  • FIG. 2 is a schematic structural diagram of a file access system according to another embodiment of the present invention.
  • the file access system of this embodiment includes: a file system driver module 10 and a client 20 of the Key-Value database.
  • the file system driver module 10 is configured to receive a first access request sent by the upper layer application, where the first access request carries the path information and the type of the Value information to be accessed; the type of the Value information to be accessed is the content type or the attribute type. .
  • the file system driver module 10 is further configured to convert the first access request into a second access request suitable for accessing the Key-Value database according to the correspondence between the access interface corresponding to the upper-layer application and the access interface of the Key-Value database;
  • the access request carries the path information and the type of Value information to be accessed.
  • the file system driver module 10 is further configured to send a second access request to a client of the Key-Value database.
  • the client 20 of the Key-Value database is connected to the file system driver module 10, and the client 20 of the Key-Value database is configured to receive the second access request sent by the file system driver module 10 from the server side of the Key-Value database.
  • Two Value information the Key information includes a path hash value corresponding to the path information; the types corresponding to the two Value information are respectively a content type and an attribute type, and the Value information corresponding to the content type includes the file content under the path corresponding to the path information.
  • the content of the directory entry; the value information corresponding to the attribute type includes the file attribute or the directory item attribute under the path corresponding to the path information.
  • the file access system of this embodiment is the same as the implementation mechanism of the above-mentioned file system, and the description of the related method embodiment is omitted.
  • the key-value database stores the file, where the key information includes the path hash value corresponding to the path information, and the value information corresponding to the content type includes the file content or the directory item content in the path corresponding to the path information; Include file attributes or directory item attributes under the path corresponding to the path information, when the files in the Key-Value database are When accessing, directly obtain the hash value corresponding to the path information according to the path information, and the type of the Value information to be accessed, and directly obtain the corresponding file content or directory item content or file attribute or directory item attribute.
  • the access overhead is small and the access efficiency is high.
  • FIG. 3 is a schematic structural diagram of a file access system according to another embodiment of the present invention.
  • the file access system of this embodiment is further described in detail in the file access system of the embodiment shown in Fig. 2 described above.
  • the file access system of this embodiment may include the following technical solutions:
  • the file system driver module 10 in the file access system of the embodiment may include: a receiving unit 101, a processing unit 102, and a sending unit 103.
  • the receiving unit 101 is configured to receive the first access request sent by the upper layer application, where the first access request carries the path information and the type of the Value information to be accessed; the type of the Value information to be accessed is a content type or an attribute type.
  • the processing unit 102 is connected to the receiving unit 101, and the processing unit 102 is further configured to convert the first access request received by the receiving unit 101 into an access key according to the correspondence between the access interface corresponding to the upper application and the access interface of the Key-Value database. - a second access request of the Value database; the second access request carries the path information and the type of Value information to be accessed.
  • the sending unit 103 is connected to the processing unit 102, and the sending unit 103 is further configured to send the second access request processed by the processing unit 102 to the client of the Key-Value database.
  • the client 20 of the Key-Value database in the file access system of the embodiment includes a receiving module 201, a calculating module 202, and a searching module 203.
  • the receiving module 201 is configured to receive a second access request sent by the file system driving module, where the second access request carries path information and a type of Value information to be accessed.
  • the receiving module 201 may be specifically connected to the sending unit 103 in the file system driving module 10, and the receiving module 201 receives the second access request sent by the sending unit 103.
  • the calculation module 202 is connected to the receiving module 201, and the calculation module 202 is configured to calculate a path hash value of the path information in the second access request received by the receiving module 201.
  • the search module 203 is connected to the receiving module 201 and the computing module 202, respectively.
  • the searching module 203 is configured to use the path hash value calculated by the calculating module 202 and the type of the Value information to be accessed carried in the second access request received by the receiving module 201. Find the corresponding file content or directory item content or file attribute or directory item attribute from the Key-Value database stored in the server side of the Key-Value database.
  • the client 20 of the Key-Value database in the file access system of the embodiment further includes a sending module 204.
  • the sending module 204 is connected to the searching module 203, and the sending module 204 is configured to search the Key-Value database stored in the server-side of the Key-Value database according to the path hash value and the type of the Value information to be accessed.
  • the file system driver module 10 sends the file content, the directory item content, the file attribute, or the upper layer application through the file system driver module 10 Directory item properties.
  • the sending module 204 can send the file content, the directory item content, the file attribute or the directory item attribute corresponding to the first access request to the upper layer application through the receiving unit 101 of the file system driving module 10.
  • the key information further includes a file name or a directory name.
  • the file attribute and the directory item attribute respectively include: at least one of a size, a type, a last access time, a last modification time, a creation time, an owner name, an owning group name, and permission information.
  • the contents of the directory entry include: The path hash of the subdirectory and/or subfile of the directory entry, the subdirectory of the directory entry, and/or the name of the subfile.
  • the file system driver module 10 in the file access system of the embodiment further includes a determining unit 104.
  • the determining unit 104 is configured to determine a correspondence between an access interface corresponding to the upper layer application and an access interface of the Key-Value database.
  • the determining unit 104 is connected to the processing unit 102, and the processing unit 102 is configured to convert the first access request to be applicable to access according to the correspondence between the access interface corresponding to the upper application determined by the determining unit 104 and the access interface of the key value database.
  • the second access request for the key-value database is configured to convert the first access request to be applicable to access according to the correspondence between the access interface corresponding to the upper application determined by the determining unit 104 and the access interface of the key value database.
  • FIG. 3 is a detailed description of the technical solution of the present invention by including all the optional technical solutions described above. In an actual application, the foregoing optional technical solutions may be combined to form one of the present invention in any combination. Alternative embodiments are not described herein.
  • the file access system of this embodiment is the same as the implementation mechanism of the above-mentioned file system, and the description of the related method embodiment is omitted.
  • the Key-Value database stores a file, where the Key information includes a path hash value corresponding to the path information, and the Value information corresponding to the content type includes a path under the path corresponding to the path information.
  • the value information corresponding to the attribute type includes the file attribute or the directory item attribute in the path corresponding to the path information.
  • the device embodiments described above are merely illustrative, wherein the units illustrated as separate components may or may not be physically separate, and the components displayed as units may or may not be physical units, ie may be located in one place. , or it can be distributed to at least two network elements. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the embodiment. Those of ordinary skill in the art can understand and implement without deliberate labor.

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Abstract

La présente invention concerne un procédé et un système d'accès aux fichiers. Le procédé consiste en ce qui suit : un module de commande de système de fichiers reçoit une première demande d'accès envoyée par une application de couche supérieure ; le module de commande de système de fichiers convertit la première demande d'accès en une deuxième demande d'accès appropriée pour accéder à une base de données de valeurs de clé en fonction de la corrélation entre une interface d'accès correspondant à l'application de couche supérieure et une interface d'accès de la base de données de valeurs de clé ; le module de commande de système de fichiers envoie la deuxième demande d'accès à un client de la base de données de valeurs de clé ; le client de la base de données de valeurs de clé recherche un contenu de fichier ou un contenu d'entrée de répertoire ou un attribut de fichier ou un attribut d'entrée de répertoire correspondant dans une base de données de valeurs de clé stockée au niveau d'une extrémité serveur de la base de données de valeurs de clé en fonction de la deuxième demande d'accès. Par rapport à la solution technique de l'art antérieur où un système de fichiers POSIX accède à des métadonnées couche par couche, la solution technique des modes de réalisation de la présente invention présente une faible surcharge d'accès et une efficacité d'accès élevée.
PCT/CN2011/085169 2011-12-31 2011-12-31 Procédé et système d'accès aux fichiers WO2013097231A1 (fr)

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CN201180003437.5A CN102725755B (zh) 2011-12-31 2011-12-31 文件访问方法及系统
PCT/CN2011/085169 WO2013097231A1 (fr) 2011-12-31 2011-12-31 Procédé et système d'accès aux fichiers

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CN103226592A (zh) * 2013-04-15 2013-07-31 浪潮(北京)电子信息产业有限公司 一种基于数据库的文件系统及文件存储方法
CN104077374B (zh) * 2014-06-24 2018-09-11 华为技术有限公司 一种实现ip盘文件存储的方法及装置
CN104268280B (zh) * 2014-10-17 2017-07-07 中国人民解放军国防科学技术大学 一种基于键值数据库的层次化存储与查询方法
CN105404821B (zh) * 2015-10-23 2018-05-04 上海帝联信息科技股份有限公司 操作系统的文件访问控制方法及装置
CN105741031A (zh) * 2016-01-28 2016-07-06 北京恒华伟业科技股份有限公司 一种工程设计方案的处理方法和装置
CN107818113B (zh) * 2016-09-13 2023-08-11 中兴通讯股份有限公司 文件访问位置的确定方法及装置
CN106484820B (zh) * 2016-09-26 2020-01-17 华为技术有限公司 一种重命名方法、访问方法及装置
CN106844579A (zh) * 2017-01-09 2017-06-13 山东中创软件商用中间件股份有限公司 一种网站废旧文件的处理方法及系统
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CN110109866B (zh) * 2017-12-28 2021-11-09 中移（杭州）信息技术有限公司 一种文件系统目录的管理方法及设备
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