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Topic: Virtual file system

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	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)

	Virtual file system - Wikipedia, the free encyclopedia
		A VFS specifies an interface (or a contract) between the kernel and a concrete file system.
		One of the first virtual file system mechanisms in Unix-like systems was the one introduced by Sun Microsystems in SunOS 2.0.
		Other virtual file system mechanisms in UNIX-like systems include the File System Switch in System V Release 3, the Generic File System in Ultrix, and the VFS in Linux.
	en.wikipedia.org /wiki/Virtual_file_system (558 words)

	Virtual File System (Site not responding. Last check: 2007-10-21)
		The physical representation of your file system should be on a Unix file of length 64K bytes.
		The first block of the disk may not be used by the file system; it is reserved for use by the operating system for cold-start initialization.
		It is not necessary to accommodate files larger than will fit on one disk, but you should allow a single file to cover the entire disk (except for the inevitable space occupied by structure information).
	protocols.netlab.uky.edu /~venu/cs690/vfs.html (548 words)

	The "Virtual File System" in Linux
		The tree of files that can be accessed at any time is determined by how the different parts are assembled together, each part being a partition of the hard driver or another physical storage device that is ``mounted'' to the system.
		files' are called that way because their inode number is dynamically allocated at file creation (instead of being extracted from an inode table or generated by a block number).
		Files marked as immutable or append-only can only be deleted when the system is in single-user mode, and are therefore secured from network intruders.
	www.linux.it /~rubini/docs/vfs/vfs.html (2842 words)

	Using the Parallel Virtual File System
		The Parallel Virtual File System (PVFS) is a parallel file system.
		Finally, there is no direct relationship between partitioning and striping for a given file; while it is often desirable to match the partition to the striping of the file, users have the option of selecting any partitioning scheme they desire independent of the striping of a file.
		The third field (the file system type) should be set to ``pvfs'' and the last two fields to 0.
	www.parl.clemson.edu /pvfs/user-guide.html (7004 words)

	The Virtual File System (VFS)
		For the root file system, this is the inode that represents the
		As the system's processes access directories and files system routines are called which traverse the VFS inodes in the system.
		All of the Linux file systems use a common buffer cache to cache data buffers from the underlying devices to help speed up access by all of the file systems to the physical devices holding the file systems.
	www.science.unitn.it /~fiorella/guidelinux/tlk/node102.html (908 words)

	Design and Implementation of the Second Extended Filesystem
		A special file is referenced by a major number, which identifies the device type, and a minor number, which identifies the unit.
		The VFS is an indirection layer which handles the file oriented system calls and calls the necessary functions in the physical filesystem code to do the I/O. This indirection mechanism is frequently used in Unix-like operating systems to ease the integration and the use of several filesystem types [Kleiman 1986, Seltzer et al.
		System V semantics are a bit more complex: if a directory has the setgid bit set, new files inherit the group id of the directory and subdirectories inherit the group id and the setgid bit; in the other case, files and subdirectories are created with the primary group id of the calling process.
	e2fsprogs.sourceforge.net /ext2intro.html (5308 words)

	About libferris
		The metadata and virtual filesystem play together here allowing you to geospatially tag both your digital pictures, trip plans, and relevent websites and recall these objects in a single virtual directory no matter what their path or URL may be.
		A context is much like a traditional file or directory in a file system, the major differences being that a context can have both byte content (like a file) and subcontexts (like a directory).
		To a ferris enabled application loading data from a native disk file, a Berkeley database, and XML file, or mbox file appear to be the same.
	witme.sourceforge.net /libferris.web (1245 words)

	The Linux kernel: The Linux Virtual File System
		The Linux kernel implements the concept of Virtual File System (VFS, originally Virtual Filesystem Switch), so that it is (to a large degree) possible to separate actual "low-level" filesystem code from the rest of the kernel.
		An (in-core) inode contains the metadata of a file: its serial number, its protection (mode), its owner, its size, the dates of last access, creation and last modification, etc. It also points to the superblock of the filesystem the file is in, the methods for this file, and the dentries (names) for this file.
		File structures represent open files, that is, an inode together with a current (reading/writing) offset.
	www.win.tue.nl /~aeb/linux/lk/lk-8.html#ss8.9 (3273 words)

	[No title]
		The freshly allocated file structure is initialised with a pointer to the dentry and a set of file operation member functions.
		Reading, writing and closing files (and other assorted VFS operations) is done by using the userspace file descriptor to grab the appropriate file structure, and then calling the required file structure method function to do whatever is required.
		For as long as the file is open, it keeps the dentry "open" (in use), which in turn means that the VFS inode is still in use.
	www.atnf.csiro.au /people/rgooch/linux/docs/vfs.txt (2269 words)

	The Parallel Virtual File System Project
		A popular approach for alleviating this kind of bottleneck is the use of parallel file systems, which can be found on many commercial parallel computers.
		The goal of the Parallel Virtual File System (PVFS) Project is to explore the design, implementation, and uses of parallel I/O. PVFS serves as both a platform for parallel I/O research as well as a production file system for the cluster computing community.
		PVFS stripes file data across multiple disks in different nodes in a cluster.
	www.parl.clemson.edu /pvfs (428 words)

	Virtual File system (Site not responding. Last check: 2007-10-21)
		This section assumes the reader is familiar with the file system layout of a typical UNIX system.
		The VFS is responsible for providing a common interface to all underlying file systems present on a system; the common file model which is capable of representing files on any type of file system.
		File object; stores information relating to the interaction of an open file and a process.
	www.kernelhacking.org /docs/kernel-overview/node9.html (238 words)

	virtual file system. (Site not responding. Last check: 2007-10-21)
		A virtual file system is the file system part of a virtual system.
		It consists of a root directory and all the files and directories that can be reached by traversing 0 or more links.
		The virtual file system is a projection of the global file system as viewed from the selected root.
	www.isi.edu /gost/info/prospero/documentation/manual/node63.html (53 words)

	HTTP Virtual File System, the First Announcement
		This is to announce an HTTP Virtual File System for Midnight Commander (MC).
		The system is no longer limited to the Midnight Commander, and can be used with any POSIX application or code.
		As one of the MC's tips says, "Shell commands will not work when you are on a non-local file system"; file editing is currently implemented in MC as a shell command.
	okmij.org /ftp/MC-HTTPFS.html (1275 words)

	APVFS Virtual file system
		The APVFS library uses a virtual file systems mechanism similar to the one used in Midnight Commander, Dos Navigator, FAR or almost any modern file manager.
		API is based on APR file API to allow easy transition from existing local file system to the virtual.
		An anchor is optional and is used on compound file systems like ZIP archives and form nesting protocols.
	apvfs.sourceforge.net (467 words)

	GNOME Filemanager
		The virtual file system, or VFS, is an abstraction that allows applications to access different types of file systems in a consistent fashion.
		The GNU Midnight Commander file manager uses the VFS to provide the user with a consistent way to access files regardless of their location.
		In the future, applications will be able to use a VFS library to be able to access files in any location in the same way that the file manager does.
	developer.gnome.org /arch/file/vfs.html (114 words)

	Parallel Virtual File System (PVFS)
		In the second case, where every process writes or reads a separate file, the user ends up with number of problems, such as dealing with many files, or restarting the application using different number of processes, or post processing multiple files (e.g.
		The parallel file system is a mechanism that allows multiple processes of a parallel program to access data from a common file, resulting high performance input output.
		For the Hoffmon Cluster, we have chosen to implement Parallel Virtual File System (PVFS), the result of a joint research project of the Parallel Architecture Research Laboratory at Clemson University and the Mathematics and Computer Science Division at Argonne National Laboratory.
	www.ats.ucla.edu /rct/beowulf/pvfs (398 words)

	VFS (Site not responding. Last check: 2007-10-21)
		Such virtual files could be remote files (on ftp sites or over a http connection) or inside archives (zip files, for instance).
		The idea is that a script doesn't need to know what or where exactly a file actually exists (note: using the file system command, there is introspection into what kind of system a file is actually on, if that information is needed).
		This is one of the areas where I see a quite unique opportunity: with FS calls out (and using a wrapped exe such as Tclkit to provide just access to runtime files stored at the end of the executable), one has a system which is provably incapable of accessing (let alone modifying) the local disk.
	wiki.tcl.tk /vfs (1755 words)

	flipcode - Programming a Virtual File System (Site not responding. Last check: 2007-10-21)
		Not only some file classes or so, but something I call a Virtual File System (VFS), my own file system that supports nice features like compression, encryption, fast access times, and so on.
		The VFS is a File System, similar to the ones Windows uses (like FAT32, NTFS,...).The main difference between the VFS and a real FS is that the VFS uses the real FS within its implementation.
		Functions one and two are easy (they are like the ones for the files and the common ones in the basic interface).
	www.flipcode.com /articles/article_vfs01.shtml (1761 words)

	Virtual File System (Site not responding. Last check: 2007-10-21)
		Resin's File support allows several URL schemes beyond the usual filesystem.
		The virtual filesystem lets scripts use the familiar file and stream APIs to send and retrieve internet resources.
		All file paths use forward slashes to separate path segments, independent of operating system.
	www.caucho.com /resin/jsref/vfs.xtp (261 words)

	owc LRC Virtual File + (Site not responding. Last check: 2007-10-21)
		Sourcebook of Criminal Justice Statistics : (C) Compiles statistics from many sources to provide information in six topical sections; characteristics of the CJ system, public attitudes towards crime and CJ related topics, nature and distribution of known offenses, characteristics and distribution of persons arrested, judicial processing of defendants, and persons under correctional supervision.
		Virtual Library : (P) An index of high quality website links on many different topics which include agriculture, business & economics, computing, communications, education, engineering, humanities, information & libraries, international affairs, law, recreation, regional studies, science, and society.
		Country Studies - Federal Research Division : (C) This site presents a description and analysis of the historical setting and the social, economic, political, and national security systems and institutions of countries throughout the world and examines the interrelationships of those systems and the ways they are shaped by cultural factors.
	lrc.owc.edu /vfile.cfm (10687 words)

	Tcl Virtual File System (Site not responding. Last check: 2007-10-21)
		The Tcl Virtual File System lets you treat all kinds of local or remote storage mechanisms the same way you'd treat local files.
		All the same commands you'd use to deal with normal files and the local filesystem are available.
		The Tcl VFS hooks into the lowest level of the Tcl I/O system, so that all file commands are available anywhere there's a virtual file system driver (which can be written in Tcl of course, so its easy to add your own).
	www.tcl.tk /about/tclvfs.html (168 words)

	Persil's Virtual File System (Site not responding. Last check: 2007-10-21)
		VFS This is my attempt at making a game-oriented virtual file system.
		And, it also serves, as the name suggests, as a virtual file system, a central repository for all files used by a project, that it be on a hard-drive or in an archive.
		- Fix: zip files with files nested in directories that have not been "created" by the application are now working.
	www.emilieprema.com /persil/vfs.html (1131 words)

	Parallel Virtual File System, Version 2
		Clusters need a parallel file system that can scale as the number of nodes increases to the thousands and tens of thousands.
		PVFS2 is a GPL/LGPL based parallel file system for cluster-based applications.
		It logically groups any number of storage servers into a coherent file system for use by client nodes, specifically tailored to handle efficient access to large shared files.
	www.pvfs.org /pvfs2 (1112 words)

	Programming PalmOS Virtual File System (Site not responding. Last check: 2007-10-21)
		Anyway, it's a good idea to scan the system to find out how many volumes are present and give the user the option of choosing a specific volume if more than one exists.
		That's fine for files which already exist, but in many cases your application may want to create a file, especially when it's being run for the very first time.
		To move a file, you will have to create a new file, copy the contents of the old file and delete the old file.
	homepage.ntlworld.com /john.r.wells/VFS_Tut.htm (2509 words)

	Commons VFS - Commons Virtual File System
		Commons VFS provides a single API for accessing various different file systems.
		It presents a uniform view of the files from various different sources, such as the files on local disk, on an HTTP server, or inside a Zip archive.
		Support for logical file systems made up of files from various different file systems.
	jakarta.apache.org /commons/vfs (122 words)

	Linux Kernel 2.4 Internals: Virtual Filesystem (VFS)
		In the world where people still use non-Linux operating systems to protect their investment in legacy software, Linux had to provide interoperability by supporting a great multitude of different filesystems - most of which would not deserve to exist on their own but only for compatibility with existing non-Linux operating systems.
		file and is used as a key to find a filesystem by its name; this same name is used for the filesystem type in mount(2), and it should be unique: there can (obviously) be only one filesystem with a given name.
		Some buggy programs rely on buggy operating systems (non-Linux) and so Linux provides a way to emulate bugs in cases where the source code is not available and so bugs cannot be fixed.
	www.tldp.org /LDP/lki/lki-3.html (5073 words)

	Aspen Systems, PVFS: Parallel Virtual File System
		The Parallel Virtual File System (PVFS) provides high-speed access to file data for parallel applications in an attempt to alleviate the bottlenecks caused by the disparity between I/O performance and processor performance.
		As with the original PVFS, PVFS2 is a parallel file system for Linux clusters.
		PVFS2 is a completely new file system design, sharing almost no code with PVFS 1.x.
	www.aspsys.com /software/file_systems/pvfs (468 words)

	[No title] (Site not responding. Last check: 2007-10-21)
		VFS is a Web-based system that allows authorised users to upload and download files.
		It is a file sharing utility aimed at communities that wish to share files across the Internet and where traditional mechanisms aren't appropriate or efficient.
		VFS tries to give users the ablity to share their files with exactly who they wish and to ensure that their confidential files remain confidential and other files are shared openly.
	vfs.sourceforge.net (299 words)

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