<html><head><meta http-equiv="Content-Type" content="text/html; charset=ANSI_X3.4-1968"><title>probe::nfs.aop.write_begin</title><meta name="generator" content="DocBook XSL Stylesheets V1.69.1"><link rel="start" href="index.html" title="SystemTap Tapset Reference Manual"><link rel="up" href="ch30.html" title="Chapter 30. Network File Storage Tapsets"><link rel="prev" href="re521.html" title="probe::nfs.aop.set_page_dirty"><link rel="next" href="re523.html" title="probe::nfs.aop.write_end"></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>probe::nfs.aop.write_begin</span></th></tr><tr><td width="20%" align="left"><a accesskey="p" href="re521.html">Prev</a> </td><th width="60%" align="center">Chapter 30. Network File Storage Tapsets</th><td width="20%" align="right"> <a accesskey="n" href="re523.html">Next</a></td></tr></table><hr></div><div class="refentry" lang="en"><a name="API-nfs-aop-write-begin"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>probe::nfs.aop.write_begin —
NFS client begin to write data
</p></div><div class="refsynopsisdiv"><h2>Synopsis</h2><pre class="synopsis">nfs.aop.write_begin </pre></div><div class="refsect1" lang="en"><a name="idp12517264"></a><h2>Values</h2><div class="variablelist"><dl><dt><span class="term"><em class="parameter"><code>dev</code></em></span></dt><dd><p>
device identifier
</p></dd><dt><span class="term"><em class="parameter"><code>page_index</code></em></span></dt><dd><p>
offset within mapping, can used a page identifier
and position identifier in the page frame
</p></dd><dt><span class="term"><em class="parameter"><code>__page</code></em></span></dt><dd><p>
the address of page
</p></dd><dt><span class="term"><em class="parameter"><code>size</code></em></span></dt><dd><p>
write bytes
</p></dd><dt><span class="term"><em class="parameter"><code>to</code></em></span></dt><dd><p>
end address of this write operation
</p></dd><dt><span class="term"><em class="parameter"><code>ino</code></em></span></dt><dd><p>
inode number
</p></dd><dt><span class="term"><em class="parameter"><code>offset</code></em></span></dt><dd><p>
start address of this write operation
</p></dd></dl></div></div><div class="refsect1" lang="en"><a name="idp12532560"></a><h2>Description</h2><p>
Occurs when write operation occurs on nfs. It prepare a page for writing,
look for a request corresponding to the page. If there
is one, and it belongs to another file, it flush it out
before it tries to copy anything into the page.
Also do the same if it finds a request from an existing
dropped page
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