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-<!-- This document was created with Syntext Serna Free. --><chapter xmlns="http://docbook.org/ns/docbook" xmlns:xl="http://www.w3.org/1999/xlink" version="5.0" xml:lang="en-US" xml:id="settinglustreproperties">
+<?xml version='1.0' encoding='UTF-8'?><chapter xmlns="http://docbook.org/ns/docbook" xmlns:xl="http://www.w3.org/1999/xlink" version="5.0" xml:lang="en-US" xml:id="settinglustreproperties">
<title xml:id="settinglustreproperties.title">Setting Lustre Properties in a C Program (<literal>llapi</literal>)</title>
<para>This chapter describes the <literal>llapi</literal> library of commands used for setting Lustre file properties within a C program running in a cluster environment, such as a data processing or MPI application. The commands described in this chapter are:</para>
<itemizedlist>
</section>
<section remap="h5">
<title>Description</title>
- <para>The <literal>llapi_file_create()</literal> function sets a file descriptor's Lustre striping information. The file descriptor is then accessed with <literal>open()</literal>.</para>
+ <para>The <literal>llapi_file_create()</literal> function sets a file descriptor's Lustre
+ file system striping information. The file descriptor is then accessed with
+ <literal>open()</literal>.</para>
<informaltable frame="all">
<tgroup cols="2">
<colspec colname="c1" colwidth="50*"/>
<para> <literal>lmm_pattern</literal></para>
</entry>
<entry>
- <para>Holds the striping pattern. Only <literal>LOV_PATTERN_RAID0</literal> is possible in this Lustre version.</para>
+ <para>Holds the striping pattern. Only <literal>LOV_PATTERN_RAID0</literal> is
+ possible in this Lustre software release.</para>
</entry>
</row>
<row>
<title>
<literal>llapi_file_open</literal>
</title>
- <para>The <literal>llapi_file_open</literal> command opens (or creates) a file or device on a Lustre filesystem.</para>
+ <para>The <literal>llapi_file_open</literal> command opens (or creates) a file or device on a
+ Lustre file system.</para>
<section remap="h5">
<title>Synopsis</title>
<screen>#include <lustre/lustreapi.h>
<section remap="h5">
<title>Description</title>
<para>The <literal>llapi_file_create()</literal> call is equivalent to the <literal>llapi_file_open</literal> call with <emphasis>flags</emphasis> equal to <literal>O_CREAT|O_WRONLY</literal> and <emphasis>mode</emphasis> equal to <literal>0644</literal>, followed by file close.</para>
- <para><literal>llapi_file_open()</literal> opens a file with a given name on a Lustre filesystem.</para>
+ <para><literal>llapi_file_open()</literal> opens a file with a given name on a Lustre file
+ system.</para>
<informaltable frame="all">
<tgroup cols="2">
<colspec colname="c1" colwidth="50*"/>
<para> <literal>stripe_pattern</literal></para>
</entry>
<entry>
- <para>Specifies the striping pattern. In this version of Lustre, only <literal>LOV_PATTERN_RAID0</literal> is available. The default value is 0.</para>
+ <para>Specifies the striping pattern. In this release of the Lustre software, only
+ <literal>LOV_PATTERN_RAID0</literal> is available. The default value is
+ 0.</para>
</entry>
</row>
</tbody>
<para> <literal>ENOTTY</literal></para>
</entry>
<entry>
- <para> <literal>name</literal> may not point to a Lustre filesystem.</para>
+ <para>
+ <literal>name</literal> may not point to a Lustre file system.</para>
</entry>
</row>
</tbody>
<para> <literal>LUSTRE_Q_QUOTAON</literal></para>
</entry>
<entry>
- <para>Turns on quotas for a Lustre file system. Deprecated as of 2.4.0. <emphasis>qc_type</emphasis> is <literal>USRQUOTA</literal>, <literal>GRPQUOTA</literal> or <literal>UGQUOTA</literal> (both user and group quota). The quota files must exist. They are normally created with the <literal>llapi_quotacheck</literal> call. This call is restricted to the super user privilege. As of 2.4.0, quota is now enabled on a per-filesystem basis via <literal>lctl conf_param</literal> (see <xref linkend="enabling_disk_quotas"/>) on the MGS node and quotacheck isn't needed any more.</para>
+ <para>Turns on quotas for a Lustre file system. Deprecated as of 2.4.0.
+ <emphasis>qc_type</emphasis> is <literal>USRQUOTA</literal>,
+ <literal>GRPQUOTA</literal> or <literal>UGQUOTA</literal> (both user and group
+ quota). The quota files must exist. They are normally created with the
+ <literal>llapi_quotacheck</literal> call. This call is restricted to the super
+ user privilege. As of 2.4.0, quota is now enabled on a per file system basis via
+ <literal>lctl conf_param</literal> (see <xref linkend="enabling_disk_quotas"/>)
+ on the MGS node and quotacheck isn't needed any more.</para>
</entry>
</row>
<row>
<para> <literal>LUSTRE_Q_GETINFO</literal></para>
</entry>
<entry>
- <para>Gets information about quotas. <emphasis>qc_type</emphasis> is either <literal>USRQUOTA</literal> or <literal>GRPQUOTA</literal>. On return, <emphasis>dqi_igrace</emphasis> is inode grace time (in seconds), <emphasis>dqi_bgrace</emphasis> is block grace time (in seconds), <emphasis>dqi_flags</emphasis> is not used by the current Lustre version.</para>
+ <para>Gets information about quotas. <emphasis>qc_type</emphasis> is either
+ <literal>USRQUOTA</literal> or <literal>GRPQUOTA</literal>. On return,
+ <emphasis>dqi_igrace</emphasis> is inode grace time (in seconds),
+ <emphasis>dqi_bgrace</emphasis> is block grace time (in seconds),
+ <emphasis>dqi_flags</emphasis> is not used by the current release of the Lustre
+ software.</para>
</entry>
</row>
<row>
<para> <literal>LUSTRE_Q_SETINFO</literal></para>
</entry>
<entry>
- <para>Sets quota information (like grace times). <emphasis>qc_type</emphasis> is either <literal>USRQUOTA</literal> or <literal>GRPQUOTA</literal>. <emphasis>dqi_igrace</emphasis> is inode grace time (in seconds), <emphasis>dqi_bgrace</emphasis> is block grace time (in seconds), <emphasis>dqi_flags</emphasis> is not used by the current Lustre version and must be zeroed.</para>
+ <para>Sets quota information (like grace times). <emphasis>qc_type</emphasis> is
+ either <literal>USRQUOTA</literal> or <literal>GRPQUOTA</literal>.
+ <emphasis>dqi_igrace</emphasis> is inode grace time (in seconds),
+ <emphasis>dqi_bgrace</emphasis> is block grace time (in seconds),
+ <emphasis>dqi_flags</emphasis> is not used by the current release of the Lustre
+ software and must be zeroed.</para>
</entry>
</row>
</tbody>
</section>
<section xml:id="dbdoclet.50438215_marker-1297700">
<title>Example Using the <literal>llapi</literal> Library</title>
- <para>Use <literal>llapi_file_create</literal> to set Lustre properties for a new file. For a synopsis and description of llapi_file_create and examples of how to use it, see <xref linkend="configurationfilesmoduleparameters"/>.</para>
+ <para>Use <literal>llapi_file_create</literal> to set Lustre software properties for a new file.
+ For a synopsis and description of <literal>llapi_file_create</literal> and examples of how to
+ use it, see <xref linkend="configurationfilesmoduleparameters"/>.</para>
<para>You can set striping from inside programs like <literal>ioctl</literal>. To compile the sample program, you need to install the Lustre client source RPM.</para>
<para><emphasis role="bold">A simple C program to demonstrate striping API - libtest.c</emphasis></para>
<programlisting>
git://git.whamcloud.com / doc / manual.git / blobdiff