The ZXFS file system proposed by Zhu Xiao uses a layered design with multiple layers including a symbolic link layer, high level scope layer, scope layer, tag layer, inode number layer, file layer, and block layer. It aims to provide a root naming hierarchy, organize files into scopes, and allow files to be located by human-oriented tags. The key layers are the tag layer, which allows files to be accessed by tags, and the scope layer, which groups files tagged with the same tag. A path-based API is also proposed that would allow searching and locating files through tag expressions similar to a SQL query.
This document discusses key concepts related to file system interfaces including:
1) File systems provide a logical representation of files and directories that can be accessed through defined operations like create, read, write, delete.
2) Files can be organized using different structures like sequential access, direct access, and indexed/relative files. Directories provide a way to group related files in a hierarchical structure.
3) File sharing, protection, and consistency models are important aspects of how multiple users can concurrently access the same files in a file system.
This document contains slides summarizing key concepts about distributed file systems. It includes figures explaining storage systems and their properties, the typical modules in a file system, common file attribute records, UNIX file system operations, the architecture of NFS, and operations of NFS servers and clients. It also discusses the Andrew File System and its implementation of file system calls.
This document discusses different file directory structures used in operating systems. It describes single-level, two-level, tree-structured, and general graph directory structures. Single-level directories have each user get their own directory space with unique file names. Two-level directories add the concept of a root directory and allow specifying the directory being accessed. Tree-structured directories allow files to be accessed in multiple places using symbolic links. General graph directories allow cycles but can cause problems for search algorithms and garbage collection.
The document discusses key aspects of file systems and file interfaces. It covers file concepts like attributes, operations, and types. It also covers access methods like sequential, direct, and indexed access. It discusses directory structures from single-level to tree-structured directories. Other topics covered include file system mounting, file sharing through multiple users and remote file systems, and protection through access controls and permissions.
The document discusses the file system interface. It describes key concepts such as files, directories, and access methods. Files are the basic unit of data storage with attributes like name, size, and permissions. Directories organize files in a hierarchical structure and allow searching, creating, deleting and listing files. There are various methods to access files sequentially or directly by record number. The directory structure has evolved from single-level to tree-structured and acyclic graphs to provide efficient searching and grouping of files. File systems need to be mounted before files can be accessed. Permissions control sharing of files between users in a multi-user system.
This document discusses distributed file systems. It describes distributed file systems as implementing a common file system that can be shared across autonomous computers. A client-server model is presented where file servers store files and clients access them. Key services like name servers and caching are described. Design issues around naming, caching, writing policies, availability, scalability, and semantics are also summarized.
The Unix file system uses a hierarchical structure with directories and files to organize data. It consists of three main file types: ordinary files containing data, directory files that act as containers for other files, and device files that represent physical devices. Files have attributes like permissions, ownership, and timestamps that provide metadata. Users can navigate this structure using commands like ls to list files, cd to change directories, and chmod to modify permissions on a file.
This chapter discusses file systems and their interfaces. It covers key concepts like files, directories, access methods, mounting file systems, file sharing, and protection. Directories provide structure and organization for files on a file system using tree or graph structures. File systems support operations like creating/deleting files, searching directories, and opening/closing files. They also implement features like file sharing across networks and access control using permissions.
This document discusses key concepts related to file system interfaces including:
1) File systems provide a logical representation of files and directories that can be accessed through defined operations like create, read, write, delete.
2) Files can be organized using different structures like sequential access, direct access, and indexed/relative files. Directories provide a way to group related files in a hierarchical structure.
3) File sharing, protection, and consistency models are important aspects of how multiple users can concurrently access the same files in a file system.
This document contains slides summarizing key concepts about distributed file systems. It includes figures explaining storage systems and their properties, the typical modules in a file system, common file attribute records, UNIX file system operations, the architecture of NFS, and operations of NFS servers and clients. It also discusses the Andrew File System and its implementation of file system calls.
This document discusses different file directory structures used in operating systems. It describes single-level, two-level, tree-structured, and general graph directory structures. Single-level directories have each user get their own directory space with unique file names. Two-level directories add the concept of a root directory and allow specifying the directory being accessed. Tree-structured directories allow files to be accessed in multiple places using symbolic links. General graph directories allow cycles but can cause problems for search algorithms and garbage collection.
The document discusses key aspects of file systems and file interfaces. It covers file concepts like attributes, operations, and types. It also covers access methods like sequential, direct, and indexed access. It discusses directory structures from single-level to tree-structured directories. Other topics covered include file system mounting, file sharing through multiple users and remote file systems, and protection through access controls and permissions.
The document discusses the file system interface. It describes key concepts such as files, directories, and access methods. Files are the basic unit of data storage with attributes like name, size, and permissions. Directories organize files in a hierarchical structure and allow searching, creating, deleting and listing files. There are various methods to access files sequentially or directly by record number. The directory structure has evolved from single-level to tree-structured and acyclic graphs to provide efficient searching and grouping of files. File systems need to be mounted before files can be accessed. Permissions control sharing of files between users in a multi-user system.
This document discusses distributed file systems. It describes distributed file systems as implementing a common file system that can be shared across autonomous computers. A client-server model is presented where file servers store files and clients access them. Key services like name servers and caching are described. Design issues around naming, caching, writing policies, availability, scalability, and semantics are also summarized.
The Unix file system uses a hierarchical structure with directories and files to organize data. It consists of three main file types: ordinary files containing data, directory files that act as containers for other files, and device files that represent physical devices. Files have attributes like permissions, ownership, and timestamps that provide metadata. Users can navigate this structure using commands like ls to list files, cd to change directories, and chmod to modify permissions on a file.
This chapter discusses file systems and their interfaces. It covers key concepts like files, directories, access methods, mounting file systems, file sharing, and protection. Directories provide structure and organization for files on a file system using tree or graph structures. File systems support operations like creating/deleting files, searching directories, and opening/closing files. They also implement features like file sharing across networks and access control using permissions.
The document discusses various aspects of file systems and storage management in operating systems. It covers topics like file attributes, operations, structures, access methods, directory structures, file sharing, consistency semantics, and protection. File attributes include the file name, size, type and protection attributes. Common file operations are creating, reading, writing and deleting files. Files can have sequential, direct or indexed access methods. Directory structures can be single-level, two-level, tree-structured or graph-based. File sharing requires consistency models like Unix, session or immutable semantics. Protection controls access via access matrices, access control lists or capability lists.
A Distributed File System(DFS) is simply a classical model of a file system distributed across multiple machines.The purpose is to promote sharing of dispersed files.
The document discusses the UNIX file system. It describes how the file system is organized in a tree structure that can be arbitrarily deep. Files include regular files, directories, device files, UNIX domain sockets, and named pipes. File permissions are managed through permission bits and special flags like setuid and setgid. Inodes store metadata about files like timestamps, ownership, and size. The file system is mounted to map directories to storage resources and unmounted to detach them.
This document provides an overview of the XFS file system for Linux. Some key points:
- XFS was designed from the start for large storage systems with many CPUs and large disk arrays, focusing on large files and streaming I/O performance.
- It uses B+ trees and extents to efficiently manage free space, file data blocks, and inode metadata, allowing it to scale to much larger file systems and files than ext3.
- Features like delayed allocation help achieve large contiguous block allocations, improving sequential I/O performance compared to ext3 and ext4. However, XFS sees less benefit for random I/O workloads.
- XFS supports direct I/O to
XFS is a file system designed for large storage needs and high performance. It supports large files and directories through its use of extents to track file data locations. XFS provides features like dynamic inode allocation, extended attributes, disk quotas, and crash recovery through write-ahead logging to enable quick recovery of metadata after an unclean shutdown.
This document summarizes key aspects of file system implementation discussed in Chapter 11. It describes the layered structure of file systems, with device drivers, the basic file system, file organization module, and logical file system layers. It also discusses important on-disk and in-memory file system structures like the boot block, superblock, file control blocks, and in-memory structures like the mount table. Common allocation methods like contiguous and linked allocation are explained. Directory implementation as linked lists or hash tables is covered as well.
ITFT_File system interface in Operating SystemSneh Prabha
File systems provide structure and organization for files on storage devices. They define file attributes like name, size, permissions and structure directories to group related files in a hierarchical tree. File systems expose files through an abstract interface of operations like create, read, write and delete and maintain metadata about open files and their locations. Access control features like permissions and sharing protocols allow multi-user systems to securely share files.
The document discusses various concepts related to file systems including file structure, attributes, operations, access methods, directory structure, mounting, sharing and protection. It describes the basic components of a file system including files, directories and how they are organized in a tree structure with path names to locate files efficiently. It also covers common file operations, sequential and direct access methods, and how files can be shared across systems through mounting and network file sharing protocols.
This summary provides the high-level information about basic file commands and networking commands:
Basic file commands include cat, more, head, tail, diff, sort, uniq, wc to display, compare, and analyze file contents. Networking commands allow connecting to remote systems like telnet, ftp, ssh and checking processes with ps, prstat. Shell commands set environment and launch jobs in foreground/background.
This document outlines key concepts related to CPU scheduling and file systems. It discusses file attributes, operations, types and structures. It also covers different access methods for files including sequential, direct, and indexed access. The document discusses various directory structures from single-level to tree-structured and graph directories. It also covers topics like file system mounting, file sharing across networks, consistency semantics, and protection through access controls and permissions.
The document discusses the different types of files in Linux, including regular files, directories, links, special files, sockets, and pipes. Regular files contain text, data, and executable programs. Directories track and locate other files. Links provide shortcuts to files. Special files represent devices for input/output. Sockets and pipes allow communication between processes, with sockets enabling communication over networks.
The document discusses file systems and file management. It defines what a file is and common file attributes like name, size, location, and permissions. It describes different types of files and various file operations. It also covers file system concepts like directory structures, access methods, open file management, and file sharing. File system protection and permissions are controlled through access lists, user and group IDs. Remote file systems allow files to be shared over a network using client-server models and distributed file systems.
This document discusses directory structures and file system mounting in operating systems. It describes several types of directory structures including single-level, two-level, hierarchical, tree, and acyclic graph structures. It notes that directories organize files in a hierarchical manner and that mounting makes storage devices available to the operating system by reading metadata about the filesystem. Mounting attaches an additional filesystem to the currently accessible filesystem, while unmounting disconnects the filesystem.
The document discusses file management and directories. It describes block management strategies like contiguous allocation and linked lists. It discusses reading and writing byte streams which involves packing and unpacking blocks of data. It also covers supporting high-level file abstractions like structured sequential files and indexed sequential files. Finally, it discusses directories and their structures like hierarchical and graph-based organizations.
This document provides guidelines for formatting Java code files, including file names, organization, indentation, and comments. It recommends using file suffixes like .java and .class. Source files should begin with copyright and description comments and contain a single public class. Methods should be grouped by functionality. Four spaces should be used for indentation. Lines should generally be no more than 80 characters and wrapped according to specific rules. Comments are important for documenting code.
This document provides an introduction to Linux, including its history from Unix and the GNU project. It describes the roles and responsibilities of a Linux system administrator, such as creating user accounts, maintaining systems, and recovering from emergencies. Tips are provided for working at the Linux command line and finding documentation. Key features of Linux include stability, security, flexibility and low cost.
The document describes a mobile app that allows anonymous chatting and partner finding. It includes implementations of chat/voting and partner finding features that store and sync event data in the cloud. The app aims to let users communicate and find partners anonymously without exposing their identities. It was developed using Google Mobile Backend Starter for the backend and includes features like anonymous group chats, event creation and browsing, and voting functionality. Future work includes adding further functionality to partner finding and improving security.
ShoppingBuddy is a shopping list app created by Neha Agarwal, Nikhil Raju, Rafica Abdul Rahim, and Swikriti Jain that allows users to create checklists, organize items by category, set priorities, receive location-based notifications, and includes a compass to point users to items. The app was designed with an easy to use interface, low power usage, ability to scale, security, and notifications.
This document is a final project report for a mobile app that allows users to browse xkcd comics. The report describes the motivation for building the app, the proposed features and design, implementation details, and lessons learned. The key features of the app include fetching and displaying the latest comic, browsing previous and random comics, integrating explanations from an external site, favoriting comics into categories, and caching images to improve performance. Testing was done using Logcat and third-party libraries helped with image caching and zooming. The report concludes with plans for future enhancements and an apology for missing the presentation.
The document discusses various aspects of file systems and storage management in operating systems. It covers topics like file attributes, operations, structures, access methods, directory structures, file sharing, consistency semantics, and protection. File attributes include the file name, size, type and protection attributes. Common file operations are creating, reading, writing and deleting files. Files can have sequential, direct or indexed access methods. Directory structures can be single-level, two-level, tree-structured or graph-based. File sharing requires consistency models like Unix, session or immutable semantics. Protection controls access via access matrices, access control lists or capability lists.
A Distributed File System(DFS) is simply a classical model of a file system distributed across multiple machines.The purpose is to promote sharing of dispersed files.
The document discusses the UNIX file system. It describes how the file system is organized in a tree structure that can be arbitrarily deep. Files include regular files, directories, device files, UNIX domain sockets, and named pipes. File permissions are managed through permission bits and special flags like setuid and setgid. Inodes store metadata about files like timestamps, ownership, and size. The file system is mounted to map directories to storage resources and unmounted to detach them.
This document provides an overview of the XFS file system for Linux. Some key points:
- XFS was designed from the start for large storage systems with many CPUs and large disk arrays, focusing on large files and streaming I/O performance.
- It uses B+ trees and extents to efficiently manage free space, file data blocks, and inode metadata, allowing it to scale to much larger file systems and files than ext3.
- Features like delayed allocation help achieve large contiguous block allocations, improving sequential I/O performance compared to ext3 and ext4. However, XFS sees less benefit for random I/O workloads.
- XFS supports direct I/O to
XFS is a file system designed for large storage needs and high performance. It supports large files and directories through its use of extents to track file data locations. XFS provides features like dynamic inode allocation, extended attributes, disk quotas, and crash recovery through write-ahead logging to enable quick recovery of metadata after an unclean shutdown.
This document summarizes key aspects of file system implementation discussed in Chapter 11. It describes the layered structure of file systems, with device drivers, the basic file system, file organization module, and logical file system layers. It also discusses important on-disk and in-memory file system structures like the boot block, superblock, file control blocks, and in-memory structures like the mount table. Common allocation methods like contiguous and linked allocation are explained. Directory implementation as linked lists or hash tables is covered as well.
ITFT_File system interface in Operating SystemSneh Prabha
File systems provide structure and organization for files on storage devices. They define file attributes like name, size, permissions and structure directories to group related files in a hierarchical tree. File systems expose files through an abstract interface of operations like create, read, write and delete and maintain metadata about open files and their locations. Access control features like permissions and sharing protocols allow multi-user systems to securely share files.
The document discusses various concepts related to file systems including file structure, attributes, operations, access methods, directory structure, mounting, sharing and protection. It describes the basic components of a file system including files, directories and how they are organized in a tree structure with path names to locate files efficiently. It also covers common file operations, sequential and direct access methods, and how files can be shared across systems through mounting and network file sharing protocols.
This summary provides the high-level information about basic file commands and networking commands:
Basic file commands include cat, more, head, tail, diff, sort, uniq, wc to display, compare, and analyze file contents. Networking commands allow connecting to remote systems like telnet, ftp, ssh and checking processes with ps, prstat. Shell commands set environment and launch jobs in foreground/background.
This document outlines key concepts related to CPU scheduling and file systems. It discusses file attributes, operations, types and structures. It also covers different access methods for files including sequential, direct, and indexed access. The document discusses various directory structures from single-level to tree-structured and graph directories. It also covers topics like file system mounting, file sharing across networks, consistency semantics, and protection through access controls and permissions.
The document discusses the different types of files in Linux, including regular files, directories, links, special files, sockets, and pipes. Regular files contain text, data, and executable programs. Directories track and locate other files. Links provide shortcuts to files. Special files represent devices for input/output. Sockets and pipes allow communication between processes, with sockets enabling communication over networks.
The document discusses file systems and file management. It defines what a file is and common file attributes like name, size, location, and permissions. It describes different types of files and various file operations. It also covers file system concepts like directory structures, access methods, open file management, and file sharing. File system protection and permissions are controlled through access lists, user and group IDs. Remote file systems allow files to be shared over a network using client-server models and distributed file systems.
This document discusses directory structures and file system mounting in operating systems. It describes several types of directory structures including single-level, two-level, hierarchical, tree, and acyclic graph structures. It notes that directories organize files in a hierarchical manner and that mounting makes storage devices available to the operating system by reading metadata about the filesystem. Mounting attaches an additional filesystem to the currently accessible filesystem, while unmounting disconnects the filesystem.
The document discusses file management and directories. It describes block management strategies like contiguous allocation and linked lists. It discusses reading and writing byte streams which involves packing and unpacking blocks of data. It also covers supporting high-level file abstractions like structured sequential files and indexed sequential files. Finally, it discusses directories and their structures like hierarchical and graph-based organizations.
This document provides guidelines for formatting Java code files, including file names, organization, indentation, and comments. It recommends using file suffixes like .java and .class. Source files should begin with copyright and description comments and contain a single public class. Methods should be grouped by functionality. Four spaces should be used for indentation. Lines should generally be no more than 80 characters and wrapped according to specific rules. Comments are important for documenting code.
This document provides an introduction to Linux, including its history from Unix and the GNU project. It describes the roles and responsibilities of a Linux system administrator, such as creating user accounts, maintaining systems, and recovering from emergencies. Tips are provided for working at the Linux command line and finding documentation. Key features of Linux include stability, security, flexibility and low cost.
The document describes a mobile app that allows anonymous chatting and partner finding. It includes implementations of chat/voting and partner finding features that store and sync event data in the cloud. The app aims to let users communicate and find partners anonymously without exposing their identities. It was developed using Google Mobile Backend Starter for the backend and includes features like anonymous group chats, event creation and browsing, and voting functionality. Future work includes adding further functionality to partner finding and improving security.
ShoppingBuddy is a shopping list app created by Neha Agarwal, Nikhil Raju, Rafica Abdul Rahim, and Swikriti Jain that allows users to create checklists, organize items by category, set priorities, receive location-based notifications, and includes a compass to point users to items. The app was designed with an easy to use interface, low power usage, ability to scale, security, and notifications.
This document is a final project report for a mobile app that allows users to browse xkcd comics. The report describes the motivation for building the app, the proposed features and design, implementation details, and lessons learned. The key features of the app include fetching and displaying the latest comic, browsing previous and random comics, integrating explanations from an external site, favoriting comics into categories, and caching images to improve performance. Testing was done using Logcat and third-party libraries helped with image caching and zooming. The report concludes with plans for future enhancements and an apology for missing the presentation.
HiTune is a Hadoop performance analyzer developed by Intel based on the open source data collection system Chukwa. It has three main parts: a tracker, aggregation engine, and analysis engine. The tracker includes the HiTune Java agent and Chukwa agent. The analysis engine includes HiTune scripts and the Chukwa Demux component. HiTune collects data from Hadoop clusters through agents and stores it in HDFS on a separate Chukwa cluster before processing the data through MapReduce jobs for analysis.
The document describes a Bookio app that was created to address problems students face in buying and selling used textbooks. It provides a common platform for students to see which other students are selling or renting books, including details on book availability and pricing. This allows students to easily find and contact other students to rent or purchase books at cheaper prices than the market. The app aims to help both students selling their books earn some money as well as students finding affordable books.
This document outlines an Android application called Event Coordinator that allows users to create, modify, and share event information. The application utilizes Facebook and push notifications to invite people and share updates. It was created using technologies like the Amazon AWS cloud, Facebook API, and Google Cloud Messaging. Features include creating and editing events, viewing event details and photos, checking participant lists, and sending invitations over Facebook. The application architecture uses a three-tier system with an Android client, AWS servers, and an AWS database.
This document outlines a proposal for a universal login system called Universal Login. It aims to address common frustrations with logins like remembering passwords and trusting sites with personal information. The system would allow users to create a single account that can be used to securely authenticate to other apps and sites. A client app would run on each device and manage security locally, exchanging user data with apps in a safe, approval-driven way. This provides a simpler and more secure alternative to existing login systems like OpenID. A demo of the proposed Universal Login architecture and features is described, along with plans for future work.
The document discusses innovating on a new emerging medium by creating a cool shopping experience. It covers the team members, product and motivation, technologies used including Mirror API and Glass Development Kit, challenges faced around memory management and location sharing, and future work around scalability, security and social features. A demo is also mentioned.
The document summarizes key concepts about file systems, including that it provides mechanisms for online storage and access to data and programs. It discusses files, directories, access methods, and protection. Files have attributes like name, size, timestamps. Access methods include sequential and direct access. Directories organize files in a tree structure and allow operations like search, create, delete, list, rename. Protection controls permissions for reading, writing and executing files.
This document discusses file systems and their implementation. It covers key concepts like file attributes, operations, access methods, directory structures, allocation methods, and more. Specifically:
- File attributes include the name, identifier, type, location, size, and protection attributes to control access and monitor usage.
- Common file operations are create, write, read, reposition, delete, truncate, open, and close.
- Access methods can be sequential or direct, with sequential only allowing reading/writing in order and direct allowing random access.
- Directory structures organize files in a tree structure with nodes containing metadata to locate files on disk.
- Allocation methods like contiguous, linked, and indexed are
The document discusses various concepts related to file systems including file structure, attributes, operations, access methods, directory structure, mounting, sharing and protection. It describes the basic components of a file system including files, directories and how they are organized in a tree structure with path names to locate files efficiently. It also covers common file operations, sequential and direct access methods, and how files can be shared across systems through mounting and network file sharing protocols.
The document discusses various concepts related to file systems including file structure, attributes, operations, access methods, directory structure, mounting, sharing and protection. It describes hierarchical tree-structured directories as the most common organization that allows for efficient searching, grouping of files and use of absolute or relative path names. File sharing across networks can be enabled through various protection schemes and network file systems like NFS.
The document discusses file concepts and file systems. It defines a file as a contiguous logical address space that can contain data or program code. Files have attributes like name, size, permissions that are stored in a directory structure on disk. Common file operations are create, write, read, delete. Files can be accessed sequentially or directly via their block number. Disk space is managed through techniques like bit vectors, linked lists, grouping, and counting to track free blocks.
SQLBits X SQL Server 2012 Rich Unstructured DataMichael Rys
SQL Server 2012 introduces new full-text search capabilities that allow rich semantic search over documents stored in SQL Server. The key features include:
1) Integrated full-text indexing and search over both structured and unstructured data stored in SQL Server tables.
2) Semantic search capabilities that understand relationships between concepts and terms in documents.
3) Support for filtering search results based on document properties and metadata.
This document discusses file management and file systems. It describes the basic concepts of files including attributes, operations, access methods, and structures. It covers directory organization including tree structures and sharing files locally and remotely. The objectives are to explain file systems, interfaces, design tradeoffs regarding access methods, sharing, locking and directories, and protection.
This document discusses distributed file systems and Network File System (NFS). It begins with an overview of distributed file system requirements including transparency, performance, scalability, fault tolerance and security. It then describes the general file service architecture with client, directory server and file server modules. The document outlines the NFS architecture and how it uses remote procedure calls for communication. It explains how NFS implements client-side caching and handles consistency across clients and the server. Finally, it briefly discusses the NFS mounting and file access protocols.
The document discusses Microsoft SQL Server 2008 R2's FILESTREAM feature. FILESTREAM allows storing unstructured binary large objects (BLOBs) such as documents, images, and videos on the file system rather than in a database. It integrates access to this file data into the database for transactional consistency. Some key points covered include FILESTREAM storage in NTFS directories, its security model using standard SQL Server permissions, and accessing BLOBs using both T-SQL queries and file streaming APIs.
prefix based labelling scheme for xml dataakash1391
This document discusses prefix-based labelling schemes for XML. It introduces XML and its tree structure, and the need for labelling schemes to optimize query retrieval. It then discusses several existing and proposed prefix-based labelling schemes, including Dewey encoding, Cohen et al., LSDX, and Ordpath. These schemes are compared based on their robustness and the time needed to process queries. The document also discusses tools used like SAX parsers and Netbeans IDE. It provides requirements for a graphical user interface application to label XML trees and extract/parse files efficiently using these techniques. Examples of Dewey and LSDX labelling schemes are also shown.
Namespaces provide unique identifiers for objects and avoid naming collisions. They are commonly structured hierarchically, where namespaces can be nested within other namespaces. This allows names to be reused in different contexts while ensuring uniqueness. Programming languages commonly use namespaces to group related variables, functions, and other symbols.
Can be built on top of base methods
General involve creation of an index for the file
Keep index in memory for fast determination of location of data to be operated on (consider UPC code plus record of data about that item)
If too large, index (in memory) of the index (on disk)
IBM indexed sequential-access method (ISAM)
Small master index, points to disk blocks of secondary index
File kept sorted on a defined key
All done by the OS
VMS operating system provides index and relative files as another example .
1. File systems provide interfaces to access files in an organized, logical structure on storage devices like disks. They define file attributes, operations, access methods, and protection mechanisms.
2. Directory structures in file systems allow logical grouping and efficient searching of files. Common structures include single-level, two-level, and tree-structured directories which may also be acyclic graphs or general graphs.
3. File systems are mounted before being accessed, and can be locally mounted or remotely mounted over a network using file sharing protocols like NFS to allow access across systems.
The document provides an overview of the Linux file system structure and common Linux commands. It describes that in Linux, everything is treated as a file, including devices, pipes and directories. It explains the different types of files and partitions in Linux, and provides examples of common file manipulation and system monitoring commands.
This document provides an overview and summary of key concepts related to distributed file systems. It begins with an introduction to file systems and their properties. It then discusses the Sun Network File System (NFS), including its architecture, operations, optimizations like caching, and how it achieves various requirements like transparency and performance. The document concludes with a brief overview of recent advances in file services beyond NFS.
This document discusses file systems and file management. It begins by defining key file concepts like file attributes and operations. It then covers topics like access methods, directory structures, file sharing, protection, and file system implementation details. The objectives are to explain file system functions, describe interfaces, discuss design tradeoffs for components like access methods and directories, and explore file system protection.
SQL Server 2012 Beyond Relational Performance and ScaleMichael Rys
This document discusses new capabilities in SQL Server 2012 for managing both structured and unstructured data. It notes challenges with building applications that use different data formats. SQL Server 2012 aims to reduce costs and simplify development by providing common application models, constructs and services for all types of data. It allows for storage and querying of various data formats natively and consistently. The document outlines new programmability options and rich services for search, spatial data, XML and more. It also shows how SQL Server 2012 provides efficient storage, high throughput access and integrated administration for all data.
Distributed File System (DFS) allows sharing of files across multiple servers, presenting them as a single file system. Microsoft's DFS unites file shares into a single namespace. DFS uses a namespace component to make locations transparent and file replication for redundancy. It groups shared folders from different servers under a DFS root for easy access, even if servers fail or experience heavy loads.
This document discusses several distributed file systems including NFS, Coda, Plan 9, xFS, and SFS. It provides details on each system's architecture, communication methods, naming, caching, replication, fault tolerance, security and access control approaches. The key aspects covered are remote access models, file operations, attributes, sharing semantics, client caching, server organization, naming schemes, and consistency models used by the different systems.
HDFS is a distributed file system designed for storing very large data files across commodity servers or clusters. It works on a master-slave architecture with one namenode (master) and multiple datanodes (slaves). The namenode manages the file system metadata and regulates client access, while datanodes store and retrieve block data from their local file systems. Files are divided into large blocks which are replicated across datanodes for fault tolerance. The namenode monitors datanodes and replicates blocks if their replication drops below a threshold.
CamEvent is an app that allows users to take pictures of event details, uses optical character recognition to extract information like the event name, location, and time, and automatically adds the event to the user's calendar. It was created by Ke Liao, Fei Liu, Wei Cao, and Teng Cui. The app uses technologies like Tesseract for OCR, ZXingObjC for QR code scanning, and BFCropInterface for cropping images. It has a simple UI and allows users to easily capture event details, edit any extracted information, and save events directly to their iPhone calendar.
The document describes iBoard, a system created by Shangjin Zhang and Chao Li that allows professors to broadcast their lecture notes in real-time to students. It discusses the motivation for iBoard to help students focus on lectures instead of note-taking, provides an overview of its architecture and functions, and outlines future goals such as implementing routing algorithms and including a file system for managing notes.
The document proposes a social media platform called Delicious for sharing recipes and discovering new recipes. The platform would allow users to post pictures and step-by-step instructions of dishes they created, share the ingredients needed, and interact with other users by friending them, liking recipes, commenting on recipes, and finding nearby users to cook with. The goals are to create a place for recipe sharing, recipe discovering through search features, and social interaction between users with similar food interests.
The document outlines a COMS 6998 project presentation by Ajay Siva Santosh, Dimitris Paidarakis, Prateek Sinha, and Zissis Konstas. It discusses the application flow, APIs used, features, optimization, and future scope of their project. The presentation includes an introduction, demo, and overview of how users can get real-time views of places around them or of interest, check photos and trending places, and look at what is happening at favorite locations or around them through various images.
This document appears to be a user interface for an online classroom platform, with sections for logging in, viewing a class list, settings, an in-class view, slide view, text view, and class info. The interface provides multiple ways for both teachers and students to access course content and materials.
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1. Sketch of the ZXFS
By @ZxMYS
http://www.slideshare.net/ZxMYS
2. What’s it
• ZXFS - Zhu Xiao’s File System
• A file system that satisfy all Ben’s
requirements
• Similar to the design of the UNIX file
system
• Implementable, Efficient and Simple
4. Layers in ZXFS
Layer Propose
Symbolic link layer Integrate multiple file systems
with symbolic links.
High level scope (HLS) layer Provide a root for the naming
user-oriented names
hierarchies.
Scope layer Organize files into naming
hierarchies.
Tag layer Provide human-oriented tags for
machine-user interface
files.
Inode Number layer Provide machine-oriented names
for files.
machine-oriented names
File layer Organize blocks into files.
Block layer Identify disk blocks.
5. Layers in ZXFS
Layer Propose
Due to compatible design in lower layers, we can take this layer directly.
Symbolic link layer Integrate multiple file systems
with symbolic links.
High level scope (HLS) layer Provide a root for the naming
user-oriented names
hierarchies.
Scope layer Organize files into naming
hierarchies.
Tag layer Provide human-oriented tags for
machine-user interface
files.
Inode Number layer Provide machine-oriented names
for files.
machine-oriented names
File layer Organize blocks into files.
Block layer Identify disk blocks.
6. Layers in ZXFS
Layer Propose
Symbolic link layer Integrate multiple file systems
with symbolic links.
Mainly use these three layers to achieve the goal .
High level scope (HLS) layer Provide a root for the naming
user-oriented names
hierarchies.
Scope layer Organize files into naming
hierarchies.
Tag layer Provide human-oriented tags for
machine-user interface
files.
Inode Number layer Provide machine-oriented names
for files.
machine-oriented names
File layer Organize blocks into files.
Block layer Identify disk blocks.
7. Layers in ZXFS
Layer Propose
Symbolic link layer Integrate multiple file systems
with symbolic links.
High level scope (HLS) layer Provide a root for the naming
user-oriented names
hierarchies.
Scope layer Organize files into naming
hierarchies.
Tag layer Provide human-oriented tags for
Need some modification in implementation machine-user interface
files.
Inode Number layer Provide machine-oriented names
for files.
machine-oriented names
File layer Organize blocks into files.
Block layer Identify disk blocks.
8. Layers in ZXFS
Layer Propose
Symbolic link layer Integrate multiple file systems
with symbolic links.
High level scope (HLS) layer Provide a root for the naming
user-oriented names
hierarchies.
Scope layer Organize files into naming
hierarchies.
Tag layer Provide human-oriented tags for
machine-user interface
files.
Inode Number layer Provide machine-oriented names
for files.
Take them directly
machine-oriented names
File layer Organize blocks into files.
Block layer Identify disk blocks.
9. Layers in ZXFS - the Tag layer
• Definition:
Tag: Some (name, value) pairs attached to files
• All files are located (in the final step) by tags,
thus the tag layer has similar functionality like
old file name layer.
• A file can have multi-tags, but must has at
least one tag, otherwise it should be deleted.
• Some traditional metadata, such as ctime,
mime and atime, are dealt as file.
10. Layers in ZXFS - the Scope Layer
• Definition:
Scope: A set of something. In this layer we discuss
‘scope for file’, which is a set of files, and ‘scope for
tag’, a set of files tagged with a certain tag.
• Each tag has it’s scope.
• Use scopes to string (group) files, like directory.
• Scope can be static or dynamic. Can present them
in memory.
• Device store scopes for all tags on that device.
11. Layers in ZXFS - the High Level Scope
(HLS) Layer
• Definition:
HLS: ‘scope for scope’
• A set of scopes, providing root for scopes
• Like ‘/’ in traditional UNIX FS
• Each device has it’s scope. When system start
up, system merge them into memory and get
an overall HLS
12. Layers in ZXFS - Path Name Stimulating
with these 3 layers
• To be more compatible with traditional UNIX
FS and enable symbolic links.
• Consider following path:
/(mount point of ZXFS)/tag_expression1/tag_
expression2/...../tag_expressionN
• Tag Expression is some expression used to
locate file using tag, like SQL or XPath
• latter N-1 ‘/’ perform AND logic here
13. Layers in ZXFS - Path Name Stimulating
with these 3 layers
• Example
/mnt/zxfs1/`ctime` greater than #2011-4-19#/`atime`
equal to #2011-4-20#/
• Looks strange but can work
• Resulting in a scope contains all files have tag ctime
and atime satisfying the expression
• If this scope has multiple files, return a directory (or
something like it)
• Else, return the file or null
• NOTE: THE DESIGN OF TAG EXPRESSION IS NOT A PART
OF THE DESIGN OF ZXFS. SO ONLY MENTION IT HERE.
17. Basic Knowledge – B+ tree
• a B+ tree or B plus tree is a type of tree which
represents sorted data in a way that allows for
efficient insertion, retrieval and removal of
records
• The primary value of a B+ tree is in storing data
for efficient retrieval in a block-oriented storage
context—in particular, file systems. Because it can
reduce the number of I/O operations required to
find an element in the tree.
18. Basic Data Structure - inode
struct inode
integer type, refcnt, filesize, userid, groupid, mode //type = FILE_TYPE or SCOPE_TYPE
integer block_numbers_for_file[N] //blocks used to save file
union
struct
integer tagsize //size of the tags
integer block_numbers_for_tags[M-1] //if type==FILE_TYPE. blocks used to
//save tags for this file
integer rest_block_numbers_for_file[M] //if type== SCOPE_TYPE or other type that have no
//tags, the rest space of this inode block can be
//used to store more inode number for files
Change inode structure into this, to implement tags and scopes
19. Basic Data Structure – tag_data
struct tag_data
integer size //indicate the size of this tag_data
integer inode_number_for_scope //pointer to the scope fot this tag
string tag_value
Every file has a B+ tree, in which
(key, value)=(tag name, tag_data)
And this B+ tree is called tag data of this file
20. Basic Data Structure – scope_data
struct scope_data
string tag_name //tag name of this scope
B_plus_tree files //B+ tree which store info about file tagged with this tag
The scope_data represent scope.
B+ tree here has
(key, value) = (tag value, file inode number)
(in device)
or
(key, value) = (tag value, (deviceID, file inode number))
(in memory)
21. Basic Data Structure
HLS is a B+ tree with
(key, value) = (tag name, inode of scope for that tag)
(in device)
Or
(key, value) = (tag name, (deviceID, inode in that device of
scope for that tag))
(in memory)
24. Outline Of API
• Most UNIX API can be implemented on ZXFS
• ALL Ben’s API can be implemented on ZXFS
25. Part of API description table
API description
search(device ID, tag name list, destination Search for files that have tagged with given tag. Device ID=0 indicates
scope ID) overall HLS of system
search(device ID or scope ID, tag expression Search for files satisfying given tag expressions. ID=0 indicates overall
list, destination scope ID) HLS of system
create(device ID) Return a file ID for a new file on given device.
delete(device ID, file ID) Remove all tags on that file, and delete that file.
read/write (device ID, file ID, offset, buf, Read/Write file
length)
list(scope ID) Returns a list of (device ID, file ID) tuples for files in that scope.
Implement by Iterating B+ tree.
mkscope() Creates an empty scope and return it’s ID. Only for scopes in memory.
merge_scope(source scope ID, destination Merge two scopes. Destination scope can only be in memory
scope ID)
tag_add/tag_remove (device ID, file ID, tag Add/Remove tag on a file.
name)
tag_get(device ID, file ID) List all tags on that file. Implement by reading tagdata of that file.
get_ HLS (device ID) Get HLS. When the device ID is 0, get the system (overall) HLS
device_list() Returns the list of currently plugged-in devices
26. Some Of API Implementation under
ZXFS 0.1
• SEARCH (TAG NAME LIST)
Just do search on B+ tree of HLS. If user gives a
device ID, use HLS of that tag
• SEARCH (TAG EXPRESSION)
Use a tag expression interpreter to interpret the
expression first, and then do search on HLS, find
corresponding scopes for tags, do another search
on them. Still, the search is performed on B+ tree
(thus very quick)
27. Some Of API Implementation under
ZXFS 0.1
• CREATE
Just find an empty inode and tag it with basic
tags like atime/ctime and mtime, update
corresponding scopes
• DELETE
Call tag_remove to remove all tags on that file.
The last remove action will cause the file be
removed.
28. Some Of API Implementation under
ZXFS 0.1
• TAG_ADD/TAG_REMOVE
By changing tag data of that file and update
corresponding scope (including HLS if necessary).
If a new tag name is introduced, make a new
scope for it on the device. If all tag of a file is
removed, remove that file.
30. Performance?
• The performance can’t be very bad since we
use B+ tree for searching, creating or
removing tag.
• Tag data has pointers back to scope, so
updating tag_value or the removal of a tag is
fast.
31. A Trade-off
• If we want to change a tag’s name, all file
tagged with that must be modified as well as
some coherence should be considered.
• However, put tag name inside tag data enable
us to find a certain tag quickly.
• We assume that finding a tag for a file
happens more often than changing name of a
tag.
32. Another Trade-off
• Storing tag name in every tag data require large
space.
– Assume user will NOT use long tag name for many
files.
• B+ tree is very large, comparing to other data
structure, in memory.
• Duplicate pointers to file in scopes for
ctime/mtime/atime, etc.
SOLUTION: ZXFS prefer time to space!
34. The practicability of tag-based FS
• If the user is hardworking in adding tags for
files, It’s OK.
• What if user is lazy?
– We need advanced AI to help, or do it by itself, to
add tags for files, according to the content of that
file.
– In near future? Maybe.