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<title>Remote File Sharing</title>

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<span id="openzim-page-title" class="mw-page-title-main"><span class="mw-page-title-main">Remote File Sharing</span></span>

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<p><b>Remote File Sharing</b> (<b>RFS</b>) is a <a href="Unix" title="Unix">Unix</a> operating system component for sharing resources, such as files, devices, and file system directories, across a network, in a network-independent manner, similar to a <a href="Distributed_file_system" class="mw-redirect" title="Distributed file system">distributed file system</a>. It was developed at <a href="Bell_Laboratories" class="mw-redirect" title="Bell Laboratories">Bell Laboratories</a> of <a href="AT%26T_Corporation" title="AT&T Corporation">AT&T</a> in the 1980s, and was first delivered with <a href="UNIX_System_V" title="UNIX System V">UNIX System V</a> Release 3 (SVR3).<sup id="cite_ref-1" class="reference"><a href="#cite_note-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup> RFS relied on the STREAMS Transport Provider Interface feature of this operating system. It was also included in UNIX System V Release 4, but as that also included the <a href="Network_File_System" title="Network File System">Network File System</a> (NFS) which was based on <a href="Internet_protocol_suite" title="Internet protocol suite">TCP/IP</a> and more widely supported in the computing industry, RFS was little used. Some licensees of AT&T UNIX System V Release 4 did not include RFS support in SVR4 distributions, and <a href="Sun_Microsystems" title="Sun Microsystems">Sun Microsystems</a> removed it from <a href="Solaris_(operating_system)" class="mw-redirect" title="Solaris (operating system)">Solaris</a> 2.4.

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<div class="mw-heading mw-heading2"><h2 id="Features">Features</h2></div>

<p>The basic application architecture of RFS is the <a href="Client%E2%80%93server_model" title="Client–server model">client–server model</a>, in which a participating host may be a server as well as a client, simultaneously. It was based on different design decisions, in comparison to the Network File System (NFS). Instead of focusing on reliable operation in the presence of failures, it focused on preserving UNIX file system semantics across the network. This enabled the system to provide remote access to hardware resources located on an RFS server. Unlike NFS (before version 4), the RFS <a href="Server_(computing)" title="Server (computing)">server</a> maintains state to keep track of how many times a file has been opened, or the <a href="Lock_(computer_science)" title="Lock (computer science)">locks</a> established on a file or device.

</p><p>RFS provides complete UNIX/POSIX file semantics for all file types, including special devices, and named pipes. It supports access controls and record and <a href="File_locking" title="File locking">file locking</a> of remote files in a transparent manner as if the shared files are local. This permitted binary application compatibility when involving network resources.<sup id="cite_ref-2" class="reference"><a href="#cite_note-2"><span class="cite-bracket">[</span>2<span class="cite-bracket">]</span></a></sup> It allows the mounting of devices across the network. For example, <i>/dev/cdrom</i> can be accessed remotely, as if it were a local resource. Access to any specific file or a file system directory is transparent across the network, so that users do not need to know where a file is actually located.

</p><p>RFS is implemented independently of the underlying network technology. For this it relies on the System V STREAMS mechanism using the Transport Provider Interface.<sup id="cite_ref-3" class="reference"><a href="#cite_note-3"><span class="cite-bracket">[</span>3<span class="cite-bracket">]</span></a></sup>

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<div class="mw-heading mw-heading2"><h2 id="Remote_system_call_interface">Remote system call interface</h2></div>

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<ul><li>ACCESS</li>

<li>SYSACCT</li>

<li>CHDIR Change directory</li>

<li>CHMOD Change file mode</li>

<li>CHOWN Change file owner</li>

<li>CHROOT</li>

<li>CLOSE Close a file</li>

<li>CREAT Create a file</li>

<li>EXEC Execute a file</li>

<li>EXECE Execute a file with an environment</li>

<li>FCNTL</li>

<li>FSTAT Stat a file using a <a href="File_descriptor" title="File descriptor">file descriptor</a></li>

<li>FSTATFS Stat a file system using a file descriptor</li>

<li>IOCTL</li>

<li>LINK First half of link() operation</li>

<li>LINK1 Second half of link() operation</li>

<li>MKNOD Make block or character special file</li>

<li>STAT Stat a file using pathname</li>

<li>STATFS Stat a file system using pathname</li>

<li>UNLINK</li>

<li>UTIME</li>

<li>UTSSYS Return information about a mounted files</li>

<li>WRITE</li>

<li>GETDENTS Read directory entries in a file system</li>

<li>MKDIR</li>

<li>RMDIR</li>

<li>SRMOUNT Server side of remote mount</li>

<li>SRUMOUNT Server side of remote unmount</li>

<li>COREDUMP Dump core request</li>

<li>WRITEI Internal form of write system call</li>

<li>READI Internal form of read system call</li>

<li>RSIGNAL Sendremote signal</li>

<li>SYNCTIME Synchronize time between machines</li>

<li>IPUT Free a remote inode</li>

<li>IUPDATE Update a remote inode</li>

<li>UPDATE Write modified buffers back to disk.</li></ul>

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<ul><li><a href="AppleTalk" title="AppleTalk">AppleTalk</a></li>

<li><a href="Samba_(software)" title="Samba (software)">Samba</a></li>

<li><a href="Server_Message_Block" title="Server Message Block">Server Message Block</a></li>

<li><a href="WebDAV" title="WebDAV">WebDAV</a></li></ul>

<div class="mw-heading mw-heading2"><h2 id="References">References</h2></div>

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</style><cite id="CITEREFRifkinForbesHamiltonSabrio1987" class="citation conference cs1">Rifkin, Andrew P.; Forbes, Michael P.; Hamilton, Richard L.; Sabrio, Michael; Shah, Suryakanta; Yueh, Kang (1987). "RFS architectural overview". <i>Australian UNIX systems User Group Newsletter</i>. Vol. 7.</cite></span>

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<li id="cite_note-2"><span class="mw-cite-backlink"><b><a href="#cite_ref-2">^</a></b></span> <span class="reference-text">A. P. Rifkin, M. P. Forbes, R. L. Hamilton, Michail Sabrio, S. Shah, and K. Yueh, <i>RFS Architectural Overview</i>, USENIX Conference Proceedings (June 1986), Atlanta, GA</span>

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<li id="cite_note-3"><span class="mw-cite-backlink"><b><a href="#cite_ref-3">^</a></b></span> <span class="reference-text">Dennis M. Ritchie, <i>A Stream Input-Output System</i>, Bell Laboratories Technical Journal 63(8) (October 1984)</span>

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