74 lines
4.7 KiB
HTML
74 lines
4.7 KiB
HTML
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<meta name="DC.Type" content="concept" />
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<meta name="DC.Title" content="Hierarchical file system (HFS)" />
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<meta name="abstract" content="A hierarchical file system (HFS) is a part of the operating system that includes the application programming interface (API) and the underlying file system (optical or otherwise) support." />
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<title>Hierarchical file system (HFS) </title>
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</head>
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<body id="hfsconcepts"><a name="hfsconcepts"><!-- --></a>
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<!-- Java sync-link --><script language="Javascript" src="../rzahg/synch.js" type="text/javascript"></script>
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<h1 class="topictitle1">Hierarchical file system (HFS) </h1>
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<div><p>A hierarchical file system (HFS) is a part of the operating system
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that includes the application programming interface (API) and the underlying
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file system (optical or otherwise) support.</p>
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<p>The HFS API makes it possible for an application that is written in a high-level
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language to create, store, retrieve, and manipulate data on a directly attached
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optical library device, LAN-attached optical library device, CD-ROM, or DVD
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device. To find more information about HFS APIs, refer to the <a href="../apiref/api.htm">APIs topic</a> in the Programming topic collection
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on the iSeries™ Information
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Center.</p>
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<div class="p">HFS API optical support consists of two parts: <ul><li>An application programming call interface to the hierarchical file system
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to manipulate objects known as files and directories.</li>
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<li>An optical or other registered file system that manages the storage devices
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where the files and directories are stored.</li>
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</ul>
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</div>
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<div class="p">HFS API optical functions include the following: <ul><li>Creating or deleting a directory</li>
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<li>Opening, reading, or closing a directory</li>
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<li>Opening, reading, writing, or closing a file</li>
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<li>Locking or unlocking bytes in a file</li>
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<li>Getting or setting the size of a file</li>
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<li>Renaming, copying, deleting, or removing a file</li>
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<li>Retrieving or changing directory entry attributes</li>
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</ul>
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</div>
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<p>Applications use HFS APIs to manage stream files on an i5/OS™ system.
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These stream files are also called objects to identify them as data elements
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that do not have a conventional record structure. The object is treated as
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a named byte stream of known length, whose size can vary from a few bytes
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to megabytes.</p>
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<p>HFS APIs allow applications to create and manage file objects on storage
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devices and to perform input/output operations to those file objects. HFS
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APIs allow applications to create and manage directory objects, which can
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be thought of as a logical grouping of similar file objects.
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These directory objects contain information about the file objects that belong
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to that directory. Directories can be contained within directories resulting
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in the hierarchical structure.</p>
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</div>
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<div>
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<div class="familylinks">
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<div class="parentlink"><strong>Parent topic:</strong> <a href="rzau8concept.htm" title="Read this topic collection for basic concepts of optical device programming. Basic concepts that are described for optical device programming include the i5/OS optical storage system, integrated file system, hierarchical file system, and considerations for volumes.">Optical device programming concepts</a></div>
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</div>
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</div>
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</body>
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</html> |