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<html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=ANSI_X3.4-1968" /><title>Data Types</title><meta name="generator" content="DocBook XSL Stylesheets V1.75.2" /><link rel="home" href="index.html" title="Linux Filesystems API" /><link rel="up" href="ch05.html" title="Chapter 5. The Linux Journalling API" /><link rel="prev" href="ch05.html" title="Chapter 5. The Linux Journalling API" /><link rel="next" href="re172.html" title="typedef handle_t" /></head><body><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center">Data Types</th></tr><tr><td width="20%" align="left"><a accesskey="p" href="ch05.html">Prev</a> </td><th width="60%" align="center">Chapter 5. The Linux Journalling API</th><td width="20%" align="right"> <a accesskey="n" href="re172.html">Next</a></td></tr></table><hr /></div><div class="sect1" title="Data Types"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a id="data_types"></a>Data Types</h2></div></div></div><div class="toc"><dl><dt><span class="sect2"><a href="ch05s02.html#structures">Structures</a></span></dt></dl></div><p>
The journalling layer uses typedefs to 'hide' the concrete definitions
of the structures used. As a client of the JBD layer you can
just rely on the using the pointer as a magic cookie of some sort.
Obviously the hiding is not enforced as this is 'C'.
</p><div class="sect2" title="Structures"><div class="titlepage"><div><div><h3 class="title"><a id="structures"></a>Structures</h3></div></div></div><div class="toc"><dl><dt><span class="refentrytitle"><a href="re172.html"><span>typedef handle_t</span></a></span><span class="refpurpose"> —
The handle_t type represents a single atomic update being performed by some process.
</span></dt><dt><span class="refentrytitle"><a href="re173.html"><span>typedef journal_t</span></a></span><span class="refpurpose"> —
The journal_t maintains all of the journaling state information for a single filesystem.
</span></dt><dt><span class="refentrytitle"><a href="re174.html"><span>struct handle_s</span></a></span><span class="refpurpose"> —
this is the concrete type associated with handle_t.
</span></dt><dt><span class="refentrytitle"><a href="re175.html"><span>struct journal_s</span></a></span><span class="refpurpose"> —
this is the concrete type associated with journal_t.
</span></dt></dl></div></div></div><div class="navfooter"><hr /><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="ch05.html">Prev</a> </td><td width="20%" align="center"><a accesskey="u" href="ch05.html">Up</a></td><td width="40%" align="right"> <a accesskey="n" href="re172.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top">Chapter 5. The Linux Journalling API </td><td width="20%" align="center"><a accesskey="h" href="index.html">Home</a></td><td width="40%" align="right" valign="top"> <span>typedef handle_t</span></td></tr></table></div></body></html>
