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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>journal_extend</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="ch05s03.html#transaction_level" title="Transasction Level" /><link rel="prev" href="re193.html" title="journal_start" /><link rel="next" href="re195.html" title="journal_restart" /></head><body><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center"><span>journal_extend</span></th></tr><tr><td width="20%" align="left"><a accesskey="p" href="re193.html">Prev</a> </td><th width="60%" align="center">Transasction Level</th><td width="20%" align="right"> <a accesskey="n" href="re195.html">Next</a></td></tr></table><hr /></div><div class="refentry" title="journal_extend"><a id="API-journal-extend"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>journal_extend —
extend buffer credits.
</p></div><div class="refsynopsisdiv" title="Synopsis"><h2>Synopsis</h2><div class="funcsynopsis"><table border="0" summary="Function synopsis" cellspacing="0" cellpadding="0" class="funcprototype-table"><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> </td><td>int <var class="pdparam">nblocks</var><code>)</code>;</td></tr></table><div class="funcprototype-spacer"> </div></div></div><div class="refsect1" title="Arguments"><a id="id3128425"></a><h2>Arguments</h2><div class="variablelist"><dl><dt><span class="term"><em class="parameter"><code>handle</code></em></span></dt><dd><p>
handle to 'extend'
</p></dd><dt><span class="term"><em class="parameter"><code>nblocks</code></em></span></dt><dd><p>
nr blocks to try to extend by.
</p></dd></dl></div></div><div class="refsect1" title="Description"><a id="id3128469"></a><h2>Description</h2><p>
Some transactions, such as large extends and truncates, can be done
atomically all at once or in several stages. The operation requests
a credit for a number of buffer modications in advance, but can
extend its credit if it needs more.
</p><p>
journal_extend tries to give the running handle more buffer credits.
It does not guarantee that allocation - this is a best-effort only.
The calling process MUST be able to deal cleanly with a failure to
extend here.
</p><p>
Return 0 on success, non-zero on failure.
</p><p>
return code < 0 implies an error
return code > 0 implies normal transaction-full status.
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