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Topic: File system

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In the News (Tue 16 Jul 19)

  How To use DHTML Web Menu on a local file system or CD-Rom
The problem we face is caused by the way the Microsoft Windows file system has been constructed and the fact that it is quite different to a Unix based file system that the Internet uses.
The differences between the two file systems are huge but we are only interested in the way you access your files using their names.
This is where the File Protocol comes in, this allows you to access files from a hard disk directly using a Unix based file system approach even on a Windows system.
www.milonic.com /filesystemproblems.php   (475 words)

  Enhancing File System Integrity Through Checksums
Stackable file systems [2] are a technique to layer new functionalities to existing file systems.
A stackable file system has many advantages: significant among them being minimal development overhead, portability, no change to the existing file systems etc. When it is easy to develop a stackable file system, there are some operations that cannot be done using it.
Since a stackable file system has the responsibility of being good to a variety of underlying file systems, it provides a higher level abstraction to the level of a file, which makes certain lower level operations almost impossible to perform from the stackable level.
www.filesystems.org /docs/nc-checksum-tr/nc-checksum.html   (3062 words)

 File System Auditor™ - ScriptLogic
File System Auditor™ allows administrators to audit file access, generate easy-to-understand compliance reports, and create alerts tied to file system events all from a centralized management console.
File System Auditor protects sensitive information by reporting attempts to access and modify files and folders, with who did it and when.
Organizations looking to validate their security controls, establish they have met compliance requirements or simply monitor file system activity, File System Auditor provides the real-time monitoring of every file system event needed to produce viable, trustworthy and complete reports of user activity.
www.scriptlogic.com /products/filesystemauditor   (126 words)

  ZFS: the last word in file systems.
After all, file systems are what they are: vulnerable to silent data corruption, brutal to manage, and excruciatingly slow.
Consider this case: To create a pool, to create three file systems, and then to grow the pool--5 logical steps--5 simple ZFS commands are required, as opposed to 28 steps with a traditional file system and volume manager.
Additionally, ZFS is the only file system that conducts end-to-end 64-bit checksums on all data to prevent silent data corruption.
www.sun.com /2004-0914/feature   (1511 words)

  File system internals
Most file systems pass information from the userland mount utility to the kernel when a new mount point is set up; this information generally includes user-tunable properties that tell the kernel how to mount the file system.
Access to a file through a NFS file handle: when the file system is asked to convert an NFS file handle to a vnode through the fhtovp vnode operation, it may need to allocate a new vnode to represent the file.
However, a file system may opt to execute it on purpose as it wishes; such a situation may be when it is mounted synchronously, as it will be updating the times as soon as the changes happen.
www.netbsd.org /Documentation/internals/en/chap-file-system.xml   (8385 words)

  File system - Wikipedia, the free encyclopedia
File systems may use a storage device such as a hard disk or CD-ROM and involve maintaining the physical location of the files, or they may be virtual and exist only as an access method for virtual data or for data over a network (e.g.
The file system software is responsible for organizing these sectors into files and directories, and keeping track of which sectors belong to which file and which are not being used.
A disk file system is a file system designed for the storage of files on a data storage device, most commonly a disk drive, which might be directly or indirectly connected to the computer.
en.wikipedia.org /wiki/File_system   (2606 words)

 Hierarchical File System - Wikipedia, the free encyclopedia
This leads to real performance problems when the system allows multitasking, as only one program can write to this structure at a time, meaning that many programs may be waiting in queue due to one program "hogging" the system.
It is also a serious reliability concern, as damage to this file can destroy the entire file system; with structure distributed across the disk, damaging a single directory is generally non-fatal and it can often be re-constructed with data held in the non-damaged portions.
The File Record also stores two 16 byte fields that are used by the Finder to store attributes about the file including things like its creator code, type code, the window the file should appear in and its location within the window.
en.wikipedia.org /wiki/Hierarchical_File_System   (1573 words)

 The Coda Distributed File System
The Coda distributed file system is a state of the art experimental file system developed in the group of M. Satyanarayanan at Carnegie Mellon University.
A system call is an operation through which a program asks the kernel for service: for example, when opening the file the kernel will want to do a lookup operation to find the inode of the file and return a file handle associated with the file to the program.
The file is now an ordinary file on the local disk, and read-write operations to the file do not reach Venus but are (almost) entirely handled by the local file system (ext2 for Linux).
www.coda.cs.cmu.edu /ljpaper/lj.html   (3542 words)

 The Unix File System
A file is the smallest unit of storage in the Unix file system.
Also note the files named bin in the file specifications of /bin, /usr/bin, and /home/mthomas/bin are different bin files, due to the differing locations in the file system hierarchy.
Moving files is very similar to copying files, the difference being with copy, the source files remain intact while with move, the source files no longer exist in their original location.
www.rwc.uc.edu /thomas/Intro_Unix_Text/File_System.html   (3213 words)

 What is file management system? - A Word Definition From the Webopedia Computer Dictionary
The system that an operating system or program uses to organize and keep track of files.
For example, a hierarchical file system is one that uses directories to organize files into a tree structure.
Whether you're looking for a refresher on files systems or want to learn the difference between FAT file systems vs. NTFS file systems, this tutorial explains the ins and outs, and pros and cons of each.
www.webopedia.com /TERM/f/file_management_system.html   (386 words)

 [No title]
A file system not only holds the data that is contained within the files of the file system but also the structure of the file system.
A file system does not need to concern itself with where on the physical media a block should be put, that is the job of the device's driver.
If anything is using the file system to be unmounted there may be VFS inodes from it in the VFS inode cache, and the code checks for this by looking through the list of inodes looking for inodes owned by the device that this file system occupies.
www.tldp.org /LDP/tlk/fs/filesystem.html   (8215 words)

 The New BFS (Brendan File System) - OSNews.com
Current file systems are horribly out-of-touch with the realities of what users need to effectively find, organize, and modify their vast quantities of files.
The Be file system basically nailed this with extendable attributes and live queries, and the BFS embraces this system whole-heartedly.
But where the Be file system made these queries persist at the application level, the BFS lets users and programmers create and extend groups by adding a search pattern to their metadata.
www.osnews.com /story.php?news_id=2762   (1051 words)

 Solid File System™ (SolFS) - Single-File Virtual File System (Delphi (VCL), .NET, Windows, Linux, PalmOS, ...
Solid File System (SolFS) is a flexible, high-performance file system, designed for use with both real media (such as Hard Drives or Flash Card) and virtual media (files on the disk, databases, application resources, raw memory).
Solid File System implements a ready file system.
Callback File System lets you create virtual file systems and disks and make them visible them to the system as if they were physical devices with a standard file system.
www.eldos.com /solfs   (523 words)

 The Andrew File System
The Andrew File System (AFS) is a distributed network file system that enables files from any AFS machine across the country to be accessed as easily as files stored locally.
AFS is composed of cells, with each cell representing an independently administered portion of file space.
Cells connect to form one enormous UNIX file system under the root /afs directory.
www.psc.edu /general/filesys/afs/afs.html   (245 words)

 General overview of the Linux file system
Systems in mixed environments may contain partitions for other system data, such as a partition with a FAT or VFAT file system for MS Windows data.
By imagining all those file systems together, we can form an idea of the tree-structure of the entire system, but it is not as simple as that.
In a file system, a file is represented by an
www.faqs.org /docs/linux_intro/sect_03_01.html   (2368 words)

 PHP: file - Manual
Note: If you are having problems with PHP not recognizing the line endings when reading files either on or created by a Macintosh computer, you might want to enable the auto_detect_line_endings run-time configuration option.
I tested fgets(), file_get_contents(), and file() on PHP 4.3.2 and PHP 5 and timed each to be under a second with over 200,000 lines.
This going in an include file that all the PHP files reference, so the only thing that needs to be do for set up, is to set the location of the config file.
www.php.net /file   (1472 words)

 Boost Filesystem Library
The organizing principle is that purely lexical operations on paths are supplied as class path member functions in path.hpp, while operations performed by the operating system on the actual external filesystem directories and files are provided in operations.hpp, primarily as free functions.
Typical operating systems rules call for deep operations on all links except that destructive operations on non-reference counted links are either shallow, or fail altogether in the case of trying to remove a non-reference counted link to a directory.
The state of files and directories is often globally shared, and thus may be changed unexpectedly by other threads, processes, or even other computers having network access to the filesystem.
www.boost.org /libs/filesystem/doc/index.htm   (2453 words)

 Network File System (NFS)
Among the many different file systems that FreeBSD supports is the Network File System, also known as NFS.
specifies a file system to be exported and which machines have access to that file system.
With this flag, the remote system will not be able to write any changes to the exported file system.
www.freebsd.org /doc/en_US.ISO8859-1/books/handbook/network-nfs.html   (1791 words)

 Aspen Systems, File Systems   (Site not responding. Last check: )
File system performance is particularly critical for applications that process large amounts of data or those which rely on out-of-core computation.
Using database journaling techniques, JFS can restore a file system to a consistent state in a matter of seconds or minutes, versus hours or days with non-journaled file systems.
Parallel Virtual File System is a user-space parallel file system for use on clusters of computers (and Beowulf parallel clusters in particular).
www.aspsys.com /software/file_systems   (367 words)

 A Dual-Disk File System: ext4
One immediate consequence is that all file systems treat the disk as a sequence of blocks: it is almost as cheap to read a block (of consecutive bytes) as it is to read a single byte.
Kernel/user space file systems: this is part a multifaceted debate about where to place the file system in the operating system; kernel space file systems avoid multiple context switches, while special-purpose user-level file systems may be tailored for special needs.
All relevant file attributes are kept in inodes, including a representation of the list of the blocks used by the file, (figure 3).
www-2.cs.cmu.edu /~mihaib/fs/fs.html   (5190 words)

 File Class (System.IO)   (Site not responding. Last check: )
Because all File methods are static, it might be more efficient to use a File method rather than a corresponding FileInfo instance method if you want to perform only one action.
All File methods require the path to the file that you are manipulating.
Specifies whether the contents of an existing file are preserved or overwritten, and whether requests to create an existing file cause an exception.
msdn2.microsoft.com /en-us/library/system.io.file.aspx   (1155 words)

 FUSEWiki - FileSystems
One Wire File System (OWFS) uses FUSE to expose all the Dallas 1-wire sensors, iButtons and memory chips as a filesystem.
Files written to the mount point will be stored encrypted (data and filename) in a directory on a normal filesystem.
The goal of this file system is to give file system developers some form of basic distributed file system, which can be later modified as per the implementor's requirement.
fuse.sourceforge.net /wiki/index.php/FileSystems   (3001 words)

 PHP: Filesystem Functions - Manual
Default wrappers are provided for the access of remote files using the ftp or http protocol, some extensions like zlib may register additional wrappers.
When turned on, PHP will examine the data read by fgets() and file() to see if it is using Unix, MS-Dos or Macintosh line-ending conventions.
This enables PHP to interoperate with Macintosh systems, but defaults to Off, as there is a very small performance penalty when detecting the EOL conventions for the first line, and also because people using carriage-returns as item separators under Unix systems would experience non-backwards-compatible behaviour.
www.php.net /manual/en/ref.filesystem.php   (2450 words)

 IBM General Parallel File System
The IBM General Parallel File System (GPFS) is a high-performance shared-disk file system that can provide fast, reliable data access from all nodes in a homogenous or heterogenous cluster of IBM UNIX®; servers running either the AIX 5L or the Linux operating system.
Because most UNIX file systems are designed for a single-server environment, adding more file servers typically does not improve the file access performance.
GPFS complies with UNIX file system standards but is designed to deliver much higher performance, scalability and failure recovery by accessing multiple file system nodes directly (no single file server) and in parallel.
www-03.ibm.com /servers/eserver/clusters/software/gpfs.html   (374 words)

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