1<html><head><meta http-equiv="Content-Type" content="text/html; charset=ANSI_X3.4-1968"><title>journal_extend</title><meta name="generator" content="DocBook XSL Stylesheets V1.78.1"><link rel="home" href="index.html" title="Linux Filesystems API"><link rel="up" href="functions.html#transaction_level" title="Transasction Level"><link rel="prev" href="API-journal-start.html" title="journal_start"><link rel="next" href="API-journal-restart.html" title="journal_restart"></head><body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center"><span class="phrase">journal_extend</span></th></tr><tr><td width="20%" align="left"><a accesskey="p" href="API-journal-start.html">Prev</a>&#160;</td><th width="60%" align="center">Transasction Level</th><td width="20%" align="right">&#160;<a accesskey="n" href="API-journal-restart.html">Next</a></td></tr></table><hr></div><div class="refentry"><a name="API-journal-extend"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>journal_extend &#8212; 
2     extend buffer credits.
3 </p></div><div class="refsynopsisdiv"><h2>Synopsis</h2><div class="funcsynopsis"><table border="0" class="funcprototype-table" summary="Function synopsis" style="cellspacing: 0; cellpadding: 0;"><tr><td><code class="funcdef">int <b class="fsfunc">journal_extend </b>(</code></td><td>handle_t * <var class="pdparam">handle</var>, </td></tr><tr><td>&#160;</td><td>int <var class="pdparam">nblocks</var><code>)</code>;</td></tr></table><div class="funcprototype-spacer">&#160;</div></div></div><div class="refsect1"><a name="idp1103846972"></a><h2>Arguments</h2><div class="variablelist"><dl class="variablelist"><dt><span class="term"><em class="parameter"><code>handle</code></em></span></dt><dd><p>
4     handle to 'extend'
5    </p></dd><dt><span class="term"><em class="parameter"><code>nblocks</code></em></span></dt><dd><p>
6     nr blocks to try to extend by.
7    </p></dd></dl></div></div><div class="refsect1"><a name="idp1103849620"></a><h2>Description</h2><p>
8   Some transactions, such as large extends and truncates, can be done
9   atomically all at once or in several stages.  The operation requests
10   a credit for a number of buffer modications in advance, but can
11   extend its credit if it needs more.
12   </p><p>
13
14   journal_extend tries to give the running handle more buffer credits.
15   It does not guarantee that allocation - this is a best-effort only.
16   The calling process MUST be able to deal cleanly with a failure to
17   extend here.
18   </p><p>
19
20   Return 0 on success, non-zero on failure.
21   </p><p>
22
23   return code &lt; 0 implies an error
24   return code &gt; 0 implies normal transaction-full status.
25</p></div></div><div class="navfooter"><hr><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="API-journal-start.html">Prev</a>&#160;</td><td width="20%" align="center"><a accesskey="u" href="functions.html#transaction_level">Up</a></td><td width="40%" align="right">&#160;<a accesskey="n" href="API-journal-restart.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top"><span class="phrase">journal_start</span>&#160;</td><td width="20%" align="center"><a accesskey="h" href="index.html">Home</a></td><td width="40%" align="right" valign="top">&#160;<span class="phrase">journal_restart</span></td></tr></table></div></body></html>
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