World Library  
Flag as Inappropriate
Email this Article

AtheOS File System

Article Id: WHEBN0001002413
Reproduction Date:

Title: AtheOS File System  
Author: World Heritage Encyclopedia
Language: English
Subject: Dell Fluid File System, Aufs, Synthetic file system, WinFS, Device file
Collection:
Publisher: World Heritage Encyclopedia
Publication
Date:
 

AtheOS File System

The AtheOS file system (AFS) was originally used in the AtheOS operating system under MBR partition ID 0x2A, and is now a part of the Syllable operating system. AFS started with exactly the same data structures as the Be File System, BFS, and extended its feature set in many ways. As such, AFS is a 64-bit journaled file system with support for file attributes. File indexing and soft deletions are also partially supported.

A few definitions:

  • Journaled -- All file system transactions are first written to a journal before they are executed. When mounted, the file system replays everything in the journal. So, if something catastrophic occurs as data is being written to the file system, the file system can recover.
  • File Attributes -- Name/value pairs tacked onto a file. For example, an audio file might have attributes for Artist, Title, and Album. This lets the file system search files in intelligent and flexible ways; example: search for all songs by Elton John that exist on the drive.
  • File Indexing -- A persistent and up-to-date list of all files with a specific attribute, and the value of that attribute. So, the system may have an index for the Artist attribute on MP3 files. This speeds searching, but slows system performance when large numbers of files are created.
  • Soft Deletions -- When the file system is told to delete a file, the file is actually hidden, and removed later by other means. In AFS, files are moved to an invisible directory and only deleted when the file system is next mounted.


This article was sourced from Creative Commons Attribution-ShareAlike License; additional terms may apply. World Heritage Encyclopedia content is assembled from numerous content providers, Open Access Publishing, and in compliance with The Fair Access to Science and Technology Research Act (FASTR), Wikimedia Foundation, Inc., Public Library of Science, The Encyclopedia of Life, Open Book Publishers (OBP), PubMed, U.S. National Library of Medicine, National Center for Biotechnology Information, U.S. National Library of Medicine, National Institutes of Health (NIH), U.S. Department of Health & Human Services, and USA.gov, which sources content from all federal, state, local, tribal, and territorial government publication portals (.gov, .mil, .edu). Funding for USA.gov and content contributors is made possible from the U.S. Congress, E-Government Act of 2002.
 
Crowd sourced content that is contributed to World Heritage Encyclopedia is peer reviewed and edited by our editorial staff to ensure quality scholarly research articles.
 
By using this site, you agree to the Terms of Use and Privacy Policy. World Heritage Encyclopedia™ is a registered trademark of the World Public Library Association, a non-profit organization.
 


Copyright © World Library Foundation. All rights reserved. eBooks from Project Gutenberg are sponsored by the World Library Foundation,
a 501c(4) Member's Support Non-Profit Organization, and is NOT affiliated with any governmental agency or department.