SettingLustreProperties.xml

   1 <?xml version="1.0" encoding="UTF-8"?>
   2 <chapter version="5.0" xml:lang="en-US" xmlns="http://docbook.org/ns/docbook" xmlns:xl="http://www.w3.org/1999/xlink">
   3   <info>
   4     <title>Setting Lustre Properties in a C Program (llapi)</title>
   5   </info>
   6   <para><anchor xml:id="dbdoclet.50438215_pgfId-1297638" xreflabel=""/>This chapter describes the llapi 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>
   7   <itemizedlist><listitem>
   8       <para><anchor xml:id="dbdoclet.50438215_pgfId-1296814" xreflabel=""/><link xl:href="SettingLustreProperties_HTML.html#50438215_30970">llapi_file_create</link></para>
   9     </listitem>
  10 <listitem>
  11       <para> </para>
  12     </listitem>
  13 <listitem>
  14       <para><anchor xml:id="dbdoclet.50438215_pgfId-1297652" xreflabel=""/><link xl:href="SettingLustreProperties_HTML.html#50438215_50149">llapi_file_get_stripe</link></para>
  15     </listitem>
  16 <listitem>
  17       <para> </para>
  18     </listitem>
  19 <listitem>
  20       <para><anchor xml:id="dbdoclet.50438215_pgfId-1297658" xreflabel=""/><link xl:href="SettingLustreProperties_HTML.html#50438215_86607">llapi_file_open</link></para>
  21     </listitem>
  22 <listitem>
  23       <para> </para>
  24     </listitem>
  25 <listitem>
  26       <para><anchor xml:id="dbdoclet.50438215_pgfId-1298853" xreflabel=""/><link xl:href="SettingLustreProperties_HTML.html#50438215_12433">llapi_quotactl</link></para>
  27     </listitem>
  28 <listitem>
  29       <para> </para>
  30     </listitem>
  31 <listitem>
  32       <para><anchor xml:id="dbdoclet.50438215_pgfId-1298974" xreflabel=""/><link xl:href="SettingLustreProperties_HTML.html#50438215_15718">llapi_path2fid</link></para>
  33     </listitem>
  34 <listitem>
  35       <para> </para>
  36     </listitem>
  37 </itemizedlist>
  38   <para><anchor xml:id="dbdoclet.50438215_pgfId-1298854" xreflabel=""/> </para>
  39   <informaltable frame="none">
  40     <tgroup cols="1">
  41       <colspec colname="c1" colwidth="100*"/>
  42       <tbody>
  43         <row>
  44           <entry><para><emphasis role="bold">Note -</emphasis><anchor xml:id="dbdoclet.50438215_pgfId-1298855" xreflabel=""/>Lustre programming interface man pages are found in the lustre/doc folder.</para></entry>
  45         </row>
  46       </tbody>
  47     </tgroup>
  48   </informaltable>
  49   <section remap="h2">
  50     <title><anchor xml:id="dbdoclet.50438215_pgfId-1296828" xreflabel=""/></title>
  51     <section remap="h2">
  52       <title>34.1 <anchor xml:id="dbdoclet.50438215_30970" xreflabel=""/>llapi_file_create</title>
  53       <para><anchor xml:id="dbdoclet.50438215_pgfId-1296829" xreflabel=""/>Use llapi_file_create to set Lustre properties for a new file.</para>
  54       <section remap="h5">
  55         <title><anchor xml:id="dbdoclet.50438215_pgfId-1296830" xreflabel=""/>Synopsis</title>
  56         <screen><anchor xml:id="dbdoclet.50438215_pgfId-1296831" xreflabel=""/>#include &lt;lustre/liblustreapi.h&gt;#include &lt;lustre/lustre_user.h&gt;
  57 <anchor xml:id="dbdoclet.50438215_pgfId-1296832" xreflabel=""/>int llapi_file_create(char *name, long stripe_size, int stripe_offset, int \
  58 stripe_count, int stripe_pattern);
  59 </screen>
  60       </section>
  61       <section remap="h5">
  62         <title><anchor xml:id="dbdoclet.50438215_pgfId-1296833" xreflabel=""/>Description</title>
  63         <para><anchor xml:id="dbdoclet.50438215_pgfId-1296834" xreflabel=""/>The llapi_file_create() function sets a file descriptorâ€™s Lustre striping information. The file descriptor is then accessed with open ().</para>
  64         <informaltable frame="all">
  65           <tgroup cols="2">
  66             <colspec colname="c1" colwidth="50*"/>
  67             <colspec colname="c2" colwidth="50*"/>
  68             <thead>
  69               <row>
  70                 <entry><para><emphasis role="bold"><anchor xml:id="dbdoclet.50438215_pgfId-1296837" xreflabel=""/>Option</emphasis></para></entry>
  71                 <entry><para><emphasis role="bold"><anchor xml:id="dbdoclet.50438215_pgfId-1296839" xreflabel=""/>Description</emphasis></para></entry>
  72               </row>
  73             </thead>
  74             <tbody>
  75               <row>
  76                 <entry><para> <anchor xml:id="dbdoclet.50438215_pgfId-1296841" xreflabel=""/><emphasis role="bold">llapi_file_create()</emphasis></para></entry>
  77                 <entry><para> <anchor xml:id="dbdoclet.50438215_pgfId-1296843" xreflabel=""/>If the file already exists, this parameter returns to â€˜EEXISTâ€™. If the stripe parameters are invalid, this parameter returns to â€˜EINVALâ€™.</para></entry>
  78               </row>
  79               <row>
  80                 <entry><para> <anchor xml:id="dbdoclet.50438215_pgfId-1296845" xreflabel=""/><emphasis role="bold">stripe_size</emphasis></para></entry>
  81                 <entry><para> <anchor xml:id="dbdoclet.50438215_pgfId-1296847" xreflabel=""/>This value must be an even multiple of system page size, as shown by getpagesize (). The default Lustre stripe size is 4MB.</para></entry>
  82               </row>
  83               <row>
  84                 <entry><para> <anchor xml:id="dbdoclet.50438215_pgfId-1296849" xreflabel=""/><emphasis role="bold">stripe_offset</emphasis></para></entry>
  85                 <entry><para> <anchor xml:id="dbdoclet.50438215_pgfId-1296851" xreflabel=""/>Indicates the starting OST for this file.</para></entry>
  86               </row>
  87               <row>
  88                 <entry><para> <anchor xml:id="dbdoclet.50438215_pgfId-1296853" xreflabel=""/><emphasis role="bold">stripe_count</emphasis></para></entry>
  89                 <entry><para> <anchor xml:id="dbdoclet.50438215_pgfId-1296855" xreflabel=""/>Indicates the number of OSTs that this file will be striped across.</para></entry>
  90               </row>
  91               <row>
  92                 <entry><para> <anchor xml:id="dbdoclet.50438215_pgfId-1296857" xreflabel=""/><emphasis role="bold">stripe_pattern</emphasis></para></entry>
  93                 <entry><para> <anchor xml:id="dbdoclet.50438215_pgfId-1296859" xreflabel=""/> Indicates the RAID pattern.</para></entry>
  94               </row>
  95             </tbody>
  96           </tgroup>
  97         </informaltable>
  98          <informaltable frame="none">
  99           <tgroup cols="1">
 100             <colspec colname="c1" colwidth="100*"/>
 101             <tbody>
 102               <row>
 103                 <entry><para><emphasis role="bold">Note -</emphasis><anchor xml:id="dbdoclet.50438215_pgfId-1296860" xreflabel=""/>Currently, only RAID 0 is supported. To use the system defaults, set these values: stripe_size = 0, stripe_offset = -1, stripe_count = 0, stripe_pattern = 0</para></entry>
 104               </row>
 105             </tbody>
 106           </tgroup>
 107         </informaltable>
 108       </section>
 109       <section remap="h5">
 110         <title><anchor xml:id="dbdoclet.50438215_pgfId-1296861" xreflabel=""/>Examples</title>
 111         <para><anchor xml:id="dbdoclet.50438215_pgfId-1296862" xreflabel=""/>System default size is 4 MB.</para>
 112         <screen><anchor xml:id="dbdoclet.50438215_pgfId-1296863" xreflabel=""/>char *tfile = TESTFILE;
 113 <anchor xml:id="dbdoclet.50438215_pgfId-1296864" xreflabel=""/>int stripe_size = 65536
 114 </screen>
 115          <para><anchor xml:id="dbdoclet.50438215_pgfId-1296865" xreflabel=""/>To start at default, run:</para>
 116         <screen><anchor xml:id="dbdoclet.50438215_pgfId-1296866" xreflabel=""/>int stripe_offset = -1
 117 </screen>
 118          <para><anchor xml:id="dbdoclet.50438215_pgfId-1296867" xreflabel=""/>To start at the default, run:</para>
 119         <screen><anchor xml:id="dbdoclet.50438215_pgfId-1296868" xreflabel=""/>int stripe_count = 1
 120 </screen>
 121          <para><anchor xml:id="dbdoclet.50438215_pgfId-1296869" xreflabel=""/>To set a single stripe for this example, run:</para>
 122         <screen><anchor xml:id="dbdoclet.50438215_pgfId-1296870" xreflabel=""/>int stripe_pattern = 0
 123 </screen>
 124          <para><anchor xml:id="dbdoclet.50438215_pgfId-1296871" xreflabel=""/>Currently, only RAID 0 is supported.</para>
 125         <screen><anchor xml:id="dbdoclet.50438215_pgfId-1296872" xreflabel=""/>int stripe_pattern = 0;
 126 <anchor xml:id="dbdoclet.50438215_pgfId-1296873" xreflabel=""/>int rc, fd;
 127 <anchor xml:id="dbdoclet.50438215_pgfId-1296874" xreflabel=""/>rc = llapi_file_create(tfile, stripe_size,stripe_offset, stripe_count,strip\
 128 e_pattern);
 129 </screen>
 130          <para><anchor xml:id="dbdoclet.50438215_pgfId-1296875" xreflabel=""/>Result code is inverted, you may return with â€™EINVALâ€™ or an ioctl error.</para>
 131         <screen><anchor xml:id="dbdoclet.50438215_pgfId-1296876" xreflabel=""/>if (rc) {
 132 <anchor xml:id="dbdoclet.50438215_pgfId-1296877" xreflabel=""/>fprintf(stderr,&quot;llapi_file_create failed: %d (%s) 0, rc, strerror(-rc));retu\
 133 rn -1; }
 134 </screen>
 135         <para><anchor xml:id="dbdoclet.50438215_pgfId-1296878" xreflabel=""/>llapi_file_create closes the file descriptor. You must re-open the descriptor. To do this, run:</para>
 136         <screen><anchor xml:id="dbdoclet.50438215_pgfId-1296879" xreflabel=""/>fd = open(tfile, O_CREAT | O_RDWR | O_LOV_DELAY_CREATE, 0644); if (fd &lt; 0) \\
 137  { fprintf(stderr, &quot;Canâ€™t open %s file: %s0, tfile,
 138 <anchor xml:id="dbdoclet.50438215_pgfId-1296880" xreflabel=""/>str-
 139 <anchor xml:id="dbdoclet.50438215_pgfId-1296881" xreflabel=""/>error(errno));
 140 <anchor xml:id="dbdoclet.50438215_pgfId-1296882" xreflabel=""/>return -1;
 141 <anchor xml:id="dbdoclet.50438215_pgfId-1296883" xreflabel=""/>}
 142 </screen>
 143       </section>
 144     </section>
 145     <section remap="h2">
 146       <title>34.2 <anchor xml:id="dbdoclet.50438215_50149" xreflabel=""/>llapi_file_get_stripe</title>
 147       <para><anchor xml:id="dbdoclet.50438215_pgfId-1296886" xreflabel=""/>Use llapi_file_get_stripe to get striping information for a file or directory on a Lustre file system.</para>
 148       <section remap="h5">
 149         <title><anchor xml:id="dbdoclet.50438215_pgfId-1296887" xreflabel=""/>Synopsis</title>
 150         <screen><anchor xml:id="dbdoclet.50438215_pgfId-1296888" xreflabel=""/>#include &lt;sys/types.h&gt;
 151 <anchor xml:id="dbdoclet.50438215_pgfId-1296889" xreflabel=""/>#include &lt;sys/stat.h&gt;
 152 <anchor xml:id="dbdoclet.50438215_pgfId-1296890" xreflabel=""/>#include &lt;fcntl.h&gt;
 153 <anchor xml:id="dbdoclet.50438215_pgfId-1296891" xreflabel=""/>#include &lt;liblustre.h&gt;
 154 <anchor xml:id="dbdoclet.50438215_pgfId-1296892" xreflabel=""/>#include &lt;lustre/lustre_idl.h&gt;
 155 <anchor xml:id="dbdoclet.50438215_pgfId-1296893" xreflabel=""/>#include &lt;lustre/liblustreapi.h&gt;
 156 <anchor xml:id="dbdoclet.50438215_pgfId-1296894" xreflabel=""/>#include &lt;lustre/lustre_user.h&gt;
 157 <anchor xml:id="dbdoclet.50438215_pgfId-1296895" xreflabel=""/>
 158 <anchor xml:id="dbdoclet.50438215_pgfId-1296896" xreflabel=""/>int llapi_file_get_stripe(const char *<emphasis>path</emphasis>, void *<emphasis>lum</emphasis>);
 159 </screen>
 160       </section>
 161       <section remap="h5">
 162         <title><anchor xml:id="dbdoclet.50438215_pgfId-1296897" xreflabel=""/>Description</title>
 163         <para><anchor xml:id="dbdoclet.50438215_pgfId-1296898" xreflabel=""/>The llapi_file_get_stripe() function returns striping information for a file or directory <emphasis>path</emphasis> in <emphasis>lum</emphasis> (which should point to a large enough memory region) in one of the following formats:</para>
 164         <screen><anchor xml:id="dbdoclet.50438215_pgfId-1296899" xreflabel=""/>struct lov_user_md_v1 {
 165 <anchor xml:id="dbdoclet.50438215_pgfId-1296900" xreflabel=""/>__u32 lmm_magic;
 166 <anchor xml:id="dbdoclet.50438215_pgfId-1296901" xreflabel=""/>__u32 lmm_pattern;
 167 <anchor xml:id="dbdoclet.50438215_pgfId-1296902" xreflabel=""/>__u64 lmm_object_id;
 168 <anchor xml:id="dbdoclet.50438215_pgfId-1296903" xreflabel=""/>__u64 lmm_object_seq;
 169 <anchor xml:id="dbdoclet.50438215_pgfId-1296904" xreflabel=""/>__u32 lmm_stripe_size;
 170 <anchor xml:id="dbdoclet.50438215_pgfId-1296905" xreflabel=""/>__u16 lmm_stripe_count;
 171 <anchor xml:id="dbdoclet.50438215_pgfId-1296906" xreflabel=""/>__u16 lmm_stripe_offset;
 172 <anchor xml:id="dbdoclet.50438215_pgfId-1296907" xreflabel=""/>struct lov_user_ost_data_v1 lmm_objects[0];
 173 <anchor xml:id="dbdoclet.50438215_pgfId-1296908" xreflabel=""/>} __attribute__((packed));
 174 <anchor xml:id="dbdoclet.50438215_pgfId-1296909" xreflabel=""/>struct lov_user_md_v3 {
 175 <anchor xml:id="dbdoclet.50438215_pgfId-1296910" xreflabel=""/>__u32 lmm_magic;
 176 <anchor xml:id="dbdoclet.50438215_pgfId-1296911" xreflabel=""/>__u32 lmm_pattern;
 177 <anchor xml:id="dbdoclet.50438215_pgfId-1296912" xreflabel=""/>__u64 lmm_object_id;
 178 <anchor xml:id="dbdoclet.50438215_pgfId-1296913" xreflabel=""/>__u64 lmm_object_seq;
 179 <anchor xml:id="dbdoclet.50438215_pgfId-1296914" xreflabel=""/>__u32 lmm_stripe_size;
 180 <anchor xml:id="dbdoclet.50438215_pgfId-1296915" xreflabel=""/>__u16 lmm_stripe_count;
 181 <anchor xml:id="dbdoclet.50438215_pgfId-1296916" xreflabel=""/>__u16 lmm_stripe_offset;
 182 <anchor xml:id="dbdoclet.50438215_pgfId-1296917" xreflabel=""/>char lmm_pool_name[LOV_MAXPOOLNAME];
 183 <anchor xml:id="dbdoclet.50438215_pgfId-1296918" xreflabel=""/>struct lov_user_ost_data_v1 lmm_objects[0];
 184 <anchor xml:id="dbdoclet.50438215_pgfId-1297038" xreflabel=""/>} __attribute__((packed));
 185 </screen>
 186         <informaltable frame="all">
 187           <tgroup cols="2">
 188             <colspec colname="c1" colwidth="50*"/>
 189             <colspec colname="c2" colwidth="50*"/>
 190             <thead>
 191               <row>
 192                 <entry><para><emphasis role="bold"><anchor xml:id="dbdoclet.50438215_pgfId-1298282" xreflabel=""/>Option</emphasis></para></entry>
 193                 <entry><para><emphasis role="bold"><anchor xml:id="dbdoclet.50438215_pgfId-1298284" xreflabel=""/>Description</emphasis></para></entry>
 194               </row>
 195             </thead>
 196             <tbody>
 197               <row>
 198                 <entry><para> <anchor xml:id="dbdoclet.50438215_pgfId-1298286" xreflabel=""/><emphasis role="bold">lmm_magic</emphasis></para></entry>
 199                 <entry><para> <anchor xml:id="dbdoclet.50438215_pgfId-1298288" xreflabel=""/>Specifies the format of the returned striping information. <emphasis role="bold">LOV_MAGIC_V1</emphasis> isused for lov_user_md_v1. <emphasis role="bold">LOV_MAGIC_V3</emphasis> is used for lov_user_md_v3.</para></entry>
 200               </row>
 201               <row>
 202                 <entry><para> <anchor xml:id="dbdoclet.50438215_pgfId-1298290" xreflabel=""/><emphasis role="bold">lmm_pattern</emphasis></para></entry>
 203                 <entry><para> <anchor xml:id="dbdoclet.50438215_pgfId-1298292" xreflabel=""/>Holds the striping pattern. Only <emphasis role="bold">LOV_PATTERN_RAID0</emphasis> is possible in this Lustre version.</para></entry>
 204               </row>
 205               <row>
 206                 <entry><para> <anchor xml:id="dbdoclet.50438215_pgfId-1298294" xreflabel=""/><emphasis role="bold">lmm_object_id</emphasis></para></entry>
 207                 <entry><para> <anchor xml:id="dbdoclet.50438215_pgfId-1298296" xreflabel=""/>Holds the MDS object ID.</para></entry>
 208               </row>
 209               <row>
 210                 <entry><para> <anchor xml:id="dbdoclet.50438215_pgfId-1298298" xreflabel=""/><emphasis role="bold">lmm_object_gr</emphasis></para></entry>
 211                 <entry><para> <anchor xml:id="dbdoclet.50438215_pgfId-1298300" xreflabel=""/>Holds the MDS object group.</para></entry>
 212               </row>
 213               <row>
 214                 <entry><para> <anchor xml:id="dbdoclet.50438215_pgfId-1298302" xreflabel=""/><emphasis role="bold">lmm_stripe_size</emphasis></para></entry>
 215                 <entry><para> <anchor xml:id="dbdoclet.50438215_pgfId-1298304" xreflabel=""/>Holds the stripe size in bytes.</para></entry>
 216               </row>
 217               <row>
 218                 <entry><para> <anchor xml:id="dbdoclet.50438215_pgfId-1298306" xreflabel=""/><emphasis role="bold">lmm_stripe_count</emphasis></para></entry>
 219                 <entry><para> <anchor xml:id="dbdoclet.50438215_pgfId-1298308" xreflabel=""/>Holds the number of OSTs over which the file is striped.</para></entry>
 220               </row>
 221               <row>
 222                 <entry><para> <anchor xml:id="dbdoclet.50438215_pgfId-1298310" xreflabel=""/><emphasis role="bold">lmm_stripe_offset</emphasis></para></entry>
 223                 <entry><para> <anchor xml:id="dbdoclet.50438215_pgfId-1298359" xreflabel=""/>Holds the OST index from which the file starts.</para></entry>
 224               </row>
 225               <row>
 226                 <entry><para> <anchor xml:id="dbdoclet.50438215_pgfId-1298314" xreflabel=""/><emphasis role="bold">lmm_pool_name</emphasis></para></entry>
 227                 <entry><para> <anchor xml:id="dbdoclet.50438215_pgfId-1298374" xreflabel=""/>Holds the OST pool name to which the file belongs.</para></entry>
 228               </row>
 229               <row>
 230                 <entry><para> <anchor xml:id="dbdoclet.50438215_pgfId-1298318" xreflabel=""/><emphasis role="bold">lmm_objects</emphasis></para></entry>
 231                 <entry><para> <anchor xml:id="dbdoclet.50438215_pgfId-1298390" xreflabel=""/>An array of lmm_stripe_count members containing per OST file information in</para><para><anchor xml:id="dbdoclet.50438215_pgfId-1298391" xreflabel=""/>the following format:</para><para><anchor xml:id="dbdoclet.50438215_pgfId-1298392" xreflabel=""/>struct lov_user_ost_data_v1 {</para><para><anchor xml:id="dbdoclet.50438215_pgfId-1298393" xreflabel=""/>__u64 l_object_id;</para><para><anchor xml:id="dbdoclet.50438215_pgfId-1298394" xreflabel=""/>__u64 l_object_seq;</para><para><anchor xml:id="dbdoclet.50438215_pgfId-1298395" xreflabel=""/>__u32 l_ost_gen;</para><para><anchor xml:id="dbdoclet.50438215_pgfId-1298396" xreflabel=""/>__u32 l_ost_idx;</para><para><anchor xml:id="dbdoclet.50438215_pgfId-1298397" xreflabel=""/>} __attribute__((packed));</para></entry>
 232               </row>
 233               <row>
 234                 <entry><para> <anchor xml:id="dbdoclet.50438215_pgfId-1298322" xreflabel=""/><emphasis role="bold">l_object_id</emphasis></para></entry>
 235                 <entry><para> <anchor xml:id="dbdoclet.50438215_pgfId-1298412" xreflabel=""/>Holds the OSTâ€™s object ID.</para></entry>
 236               </row>
 237               <row>
 238                 <entry><para> <anchor xml:id="dbdoclet.50438215_pgfId-1298326" xreflabel=""/><emphasis role="bold">l_object_seq</emphasis></para></entry>
 239                 <entry><para> <anchor xml:id="dbdoclet.50438215_pgfId-1298427" xreflabel=""/>Holds the OSTâ€™s object group.</para></entry>
 240               </row>
 241               <row>
 242                 <entry><para> <anchor xml:id="dbdoclet.50438215_pgfId-1298330" xreflabel=""/><emphasis role="bold">l_ost_gen</emphasis></para></entry>
 243                 <entry><para> <anchor xml:id="dbdoclet.50438215_pgfId-1298442" xreflabel=""/>Holds the OSTâ€™s index generation.</para></entry>
 244               </row>
 245               <row>
 246                 <entry><para> <anchor xml:id="dbdoclet.50438215_pgfId-1298334" xreflabel=""/><emphasis role="bold">l_ost_idx</emphasis></para></entry>
 247                 <entry><para> <anchor xml:id="dbdoclet.50438215_pgfId-1298461" xreflabel=""/>Holds the OSTâ€™s index in LOV.</para></entry>
 248               </row>
 249             </tbody>
 250           </tgroup>
 251         </informaltable>
 252       </section>
 253       <section remap="h5">
 254         <title><anchor xml:id="dbdoclet.50438215_pgfId-1297039" xreflabel=""/>Return Values</title>
 255         <para><anchor xml:id="dbdoclet.50438215_pgfId-1297040" xreflabel=""/>llapi_file_get_stripe() returns:</para>
 256         <para><anchor xml:id="dbdoclet.50438215_pgfId-1297041" xreflabel=""/><emphasis role="bold">0</emphasis> On success</para>
 257         <para><anchor xml:id="dbdoclet.50438215_pgfId-1297042" xreflabel=""/><emphasis role="bold">!= 0</emphasis> On failure, <emphasis>errno</emphasis> is set appropriately</para>
 258       </section>
 259       <section remap="h5">
 260         <title><anchor xml:id="dbdoclet.50438215_pgfId-1297043" xreflabel=""/>Errors</title>
 261         <informaltable frame="all">
 262           <tgroup cols="2">
 263             <colspec colname="c1" colwidth="50*"/>
 264             <colspec colname="c2" colwidth="50*"/>
 265             <thead>
 266               <row>
 267                 <entry><para><emphasis role="bold"><anchor xml:id="dbdoclet.50438215_pgfId-1298797" xreflabel=""/>Errors</emphasis></para></entry>
 268                 <entry><para><emphasis role="bold"><anchor xml:id="dbdoclet.50438215_pgfId-1298799" xreflabel=""/>Description</emphasis></para></entry>
 269               </row>
 270             </thead>
 271             <tbody>
 272               <row>
 273                 <entry><para> <anchor xml:id="dbdoclet.50438215_pgfId-1298801" xreflabel=""/><emphasis role="bold">ENOMEM</emphasis></para></entry>
 274                 <entry><para> <anchor xml:id="dbdoclet.50438215_pgfId-1298803" xreflabel=""/><emphasis role="bold">Failed to allocate memory</emphasis></para></entry>
 275               </row>
 276               <row>
 277                 <entry><para> <anchor xml:id="dbdoclet.50438215_pgfId-1298805" xreflabel=""/><emphasis role="bold">ENAMETOOLONG</emphasis></para></entry>
 278                 <entry><para> <anchor xml:id="dbdoclet.50438215_pgfId-1298868" xreflabel=""/>Path was too long</para></entry>
 279               </row>
 280               <row>
 281                 <entry><para> <anchor xml:id="dbdoclet.50438215_pgfId-1298809" xreflabel=""/><emphasis role="bold">ENOENT</emphasis></para></entry>
 282                 <entry><para> <anchor xml:id="dbdoclet.50438215_pgfId-1298870" xreflabel=""/>Path does not point to a file or directory</para></entry>
 283               </row>
 284               <row>
 285                 <entry><para> <anchor xml:id="dbdoclet.50438215_pgfId-1298813" xreflabel=""/><emphasis role="bold">ENOTTY</emphasis></para></entry>
 286                 <entry><para> <anchor xml:id="dbdoclet.50438215_pgfId-1298872" xreflabel=""/>Path does not point to a Lustre file system</para></entry>
 287               </row>
 288               <row>
 289                 <entry><para> <anchor xml:id="dbdoclet.50438215_pgfId-1298817" xreflabel=""/><emphasis role="bold">EFAULT</emphasis></para></entry>
 290                 <entry><para> <anchor xml:id="dbdoclet.50438215_pgfId-1298819" xreflabel=""/>Memory region pointed by lum is not properly mapped</para></entry>
 291               </row>
 292             </tbody>
 293           </tgroup>
 294         </informaltable>
 295       </section>
 296       <section remap="h5">
 297         <title><anchor xml:id="dbdoclet.50438215_pgfId-1298829" xreflabel=""/>Examples</title>
 298         <screen><anchor xml:id="dbdoclet.50438215_pgfId-1297050" xreflabel=""/>#include &lt;sys/vfs.h&gt;
 299 <anchor xml:id="dbdoclet.50438215_pgfId-1297051" xreflabel=""/>#include &lt;liblustre.h&gt;
 300 <anchor xml:id="dbdoclet.50438215_pgfId-1297052" xreflabel=""/>#include &lt;lnet/lnetctl.h&gt;
 301 <anchor xml:id="dbdoclet.50438215_pgfId-1297053" xreflabel=""/>#include &lt;obd.h&gt;
 302 <anchor xml:id="dbdoclet.50438215_pgfId-1297054" xreflabel=""/>#include &lt;lustre_lib.h&gt;
 303 <anchor xml:id="dbdoclet.50438215_pgfId-1297055" xreflabel=""/>#include &lt;lustre/liblustreapi.h&gt;
 304 <anchor xml:id="dbdoclet.50438215_pgfId-1297056" xreflabel=""/>#include &lt;obd_lov.h&gt;
 305 <anchor xml:id="dbdoclet.50438215_pgfId-1297057" xreflabel=""/>static inline int maxint(int a, int b)
 306 <anchor xml:id="dbdoclet.50438215_pgfId-1297058" xreflabel=""/>{
 307 <anchor xml:id="dbdoclet.50438215_pgfId-1297059" xreflabel=""/>return a &gt; b ? a : b;
 308 <anchor xml:id="dbdoclet.50438215_pgfId-1297060" xreflabel=""/>}
 309 <anchor xml:id="dbdoclet.50438215_pgfId-1297061" xreflabel=""/>static void *alloc_lum()
 310 <anchor xml:id="dbdoclet.50438215_pgfId-1297062" xreflabel=""/>{
 311 <anchor xml:id="dbdoclet.50438215_pgfId-1297063" xreflabel=""/>int v1, v3, join;
 312 <anchor xml:id="dbdoclet.50438215_pgfId-1297064" xreflabel=""/>v1 = sizeof(struct lov_user_md_v1) +
 313 <anchor xml:id="dbdoclet.50438215_pgfId-1297065" xreflabel=""/>LOV_MAX_STRIPE_COUNT * sizeof(struct lov_user_ost_data_v1);
 314 <anchor xml:id="dbdoclet.50438215_pgfId-1297066" xreflabel=""/>v3 = sizeof(struct lov_user_md_v3) +
 315 <anchor xml:id="dbdoclet.50438215_pgfId-1297067" xreflabel=""/>LOV_MAX_STRIPE_COUNT * sizeof(struct lov_user_ost_data_v1);
 316 <anchor xml:id="dbdoclet.50438215_pgfId-1297068" xreflabel=""/>return malloc(maxint(v1, v3));
 317 <anchor xml:id="dbdoclet.50438215_pgfId-1297069" xreflabel=""/>}
 318 <anchor xml:id="dbdoclet.50438215_pgfId-1297070" xreflabel=""/>int main(int argc, char** argv)
 319 <anchor xml:id="dbdoclet.50438215_pgfId-1297071" xreflabel=""/>{
 320 <anchor xml:id="dbdoclet.50438215_pgfId-1297072" xreflabel=""/>struct lov_user_md *lum_file = NULL;
 321 <anchor xml:id="dbdoclet.50438215_pgfId-1297073" xreflabel=""/>int rc;
 322 <anchor xml:id="dbdoclet.50438215_pgfId-1297074" xreflabel=""/>int lum_size;
 323 <anchor xml:id="dbdoclet.50438215_pgfId-1297075" xreflabel=""/>if (argc != 2) {
 324 <anchor xml:id="dbdoclet.50438215_pgfId-1297076" xreflabel=""/>fprintf(stderr, &quot;Usage: %s &lt;filename&gt;\n&quot;, argv[0]);
 325 <anchor xml:id="dbdoclet.50438215_pgfId-1297077" xreflabel=""/>return 1;
 326 <anchor xml:id="dbdoclet.50438215_pgfId-1297078" xreflabel=""/>}
 327 <anchor xml:id="dbdoclet.50438215_pgfId-1297079" xreflabel=""/>lum_file = alloc_lum();
 328 <anchor xml:id="dbdoclet.50438215_pgfId-1297080" xreflabel=""/>if (lum_file == NULL) {
 329 <anchor xml:id="dbdoclet.50438215_pgfId-1297081" xreflabel=""/>rc = ENOMEM;
 330 <anchor xml:id="dbdoclet.50438215_pgfId-1297082" xreflabel=""/>goto cleanup;
 331 <anchor xml:id="dbdoclet.50438215_pgfId-1297083" xreflabel=""/>}
 332 <anchor xml:id="dbdoclet.50438215_pgfId-1297084" xreflabel=""/>rc = llapi_file_get_stripe(argv[1], lum_file);
 333 <anchor xml:id="dbdoclet.50438215_pgfId-1297085" xreflabel=""/>if (rc) {
 334 <anchor xml:id="dbdoclet.50438215_pgfId-1297086" xreflabel=""/>rc = errno;
 335 <anchor xml:id="dbdoclet.50438215_pgfId-1297087" xreflabel=""/>goto cleanup;
 336 <anchor xml:id="dbdoclet.50438215_pgfId-1297088" xreflabel=""/>}
 337 <anchor xml:id="dbdoclet.50438215_pgfId-1297089" xreflabel=""/>/* stripe_size stripe_count */
 338 <anchor xml:id="dbdoclet.50438215_pgfId-1297090" xreflabel=""/>printf(&quot;%d %d\n&quot;,
 339 <anchor xml:id="dbdoclet.50438215_pgfId-1297091" xreflabel=""/>lum_file-&gt;lmm_stripe_size,
 340 <anchor xml:id="dbdoclet.50438215_pgfId-1297092" xreflabel=""/>lum_file-&gt;lmm_stripe_count);
 341 <anchor xml:id="dbdoclet.50438215_pgfId-1297093" xreflabel=""/>cleanup:
 342 <anchor xml:id="dbdoclet.50438215_pgfId-1297094" xreflabel=""/>if (lum_file != NULL)
 343 <anchor xml:id="dbdoclet.50438215_pgfId-1297095" xreflabel=""/>free(lum_file);
 344 <anchor xml:id="dbdoclet.50438215_pgfId-1297096" xreflabel=""/>return rc;
 345 <anchor xml:id="dbdoclet.50438215_pgfId-1297097" xreflabel=""/>}
 346 </screen>
 347       </section>
 348     </section>
 349     <section remap="h2">
 350       <title>34.3 <anchor xml:id="dbdoclet.50438215_86607" xreflabel=""/>llapi_file_open</title>
 351       <para><anchor xml:id="dbdoclet.50438215_pgfId-1298469" xreflabel=""/>The llapi_file_open command opens (or creates) a file or device on a Lustre filesystem.</para>
 352       <section remap="h5">
 353         <title><anchor xml:id="dbdoclet.50438215_pgfId-1297361" xreflabel=""/>Synopsis</title>
 354         <screen><anchor xml:id="dbdoclet.50438215_pgfId-1297362" xreflabel=""/>#include &lt;sys/types.h&gt;
 355 <anchor xml:id="dbdoclet.50438215_pgfId-1297363" xreflabel=""/>#include &lt;sys/stat.h&gt;
 356 <anchor xml:id="dbdoclet.50438215_pgfId-1297364" xreflabel=""/>#include &lt;fcntl.h&gt;
 357 <anchor xml:id="dbdoclet.50438215_pgfId-1297365" xreflabel=""/>#include &lt;liblustre.h&gt;
 358 <anchor xml:id="dbdoclet.50438215_pgfId-1297366" xreflabel=""/>#include &lt;lustre/lustre_idl.h&gt;
 359 <anchor xml:id="dbdoclet.50438215_pgfId-1297367" xreflabel=""/>#include &lt;lustre/liblustreapi.h&gt;
 360 <anchor xml:id="dbdoclet.50438215_pgfId-1297368" xreflabel=""/>#include &lt;lustre/lustre_user.h&gt;
 361 <anchor xml:id="dbdoclet.50438215_pgfId-1297369" xreflabel=""/>int llapi_file_open(const char *<emphasis>name</emphasis>, int <emphasis>flags</emphasis>, int <emphasis>mode</emphasis>,
 362 <anchor xml:id="dbdoclet.50438215_pgfId-1297370" xreflabel=""/>   unsigned long long <emphasis>stripe_size</emphasis>, int <emphasis>stripe_offset</emphasis>,
 363 <anchor xml:id="dbdoclet.50438215_pgfId-1297371" xreflabel=""/>   int <emphasis>stripe_count</emphasis>, int <emphasis>stripe_pattern</emphasis>);
 364 <anchor xml:id="dbdoclet.50438215_pgfId-1297372" xreflabel=""/>int llapi_file_create(const char *<emphasis>name</emphasis>, unsigned long long <emphasis>stripe_size</emphasis>,
 365 <anchor xml:id="dbdoclet.50438215_pgfId-1297373" xreflabel=""/>   int <emphasis>stripe_offset</emphasis>, int <emphasis>stripe_count</emphasis>,
 366 <anchor xml:id="dbdoclet.50438215_pgfId-1297374" xreflabel=""/>   int <emphasis>stripe_pattern</emphasis>);
 367 </screen>
 368       </section>
 369       <section remap="h5">
 370         <title><anchor xml:id="dbdoclet.50438215_pgfId-1298000" xreflabel=""/>Description</title>
 371         <para><anchor xml:id="dbdoclet.50438215_pgfId-1298001" xreflabel=""/>The llapi_file_create() call is equivalent to the llapi_file_open call with <emphasis>flags</emphasis> equal to O_CREAT|O_WRONLY and <emphasis>mode</emphasis> equal to 0644, followed by file close.</para>
 372         <para><anchor xml:id="dbdoclet.50438215_pgfId-1298510" xreflabel=""/>llapi_file_open() opens a file with a given name on a Lustre filesystem.</para>
 373         <informaltable frame="all">
 374           <tgroup cols="2">
 375             <colspec colname="c1" colwidth="50*"/>
 376             <colspec colname="c2" colwidth="50*"/>
 377             <thead>
 378               <row>
 379                 <entry><para><emphasis role="bold"><anchor xml:id="dbdoclet.50438215_pgfId-1298598" xreflabel=""/>Option</emphasis></para></entry>
 380                 <entry><para><emphasis role="bold"><anchor xml:id="dbdoclet.50438215_pgfId-1298600" xreflabel=""/>Description</emphasis></para></entry>
 381               </row>
 382             </thead>
 383             <tbody>
 384               <row>
 385                 <entry><para> <anchor xml:id="dbdoclet.50438215_pgfId-1298602" xreflabel=""/><emphasis role="bold">flags</emphasis></para></entry>
 386                 <entry><para> <anchor xml:id="dbdoclet.50438215_pgfId-1298636" xreflabel=""/>Can be a combination of O_RDONLY, O_WRONLY, O_RDWR, O_CREAT, O_EXCL, O_NOCTTY, O_TRUNC, O_APPEND, O_NONBLOCK, O_SYNC, FASYNC, O_DIRECT, O_LARGEFILE, O_DIRECTORY, O_NOFOLLOW, O_NOATIME.</para></entry>
 387               </row>
 388               <row>
 389                 <entry><para> <anchor xml:id="dbdoclet.50438215_pgfId-1298606" xreflabel=""/><emphasis role="bold">mode</emphasis></para></entry>
 390                 <entry><para> <anchor xml:id="dbdoclet.50438215_pgfId-1298656" xreflabel=""/>Specifies the permission bits to be used for a new file when O_CREAT is used.</para></entry>
 391               </row>
 392               <row>
 393                 <entry><para> <anchor xml:id="dbdoclet.50438215_pgfId-1298610" xreflabel=""/><emphasis role="bold">stripe_size</emphasis></para></entry>
 394                 <entry><para> <anchor xml:id="dbdoclet.50438215_pgfId-1298669" xreflabel=""/>Specifies stripe size (in bytes). Should be multiple of 64 KB, not exceeding 4 GB.</para></entry>
 395               </row>
 396               <row>
 397                 <entry><para> <anchor xml:id="dbdoclet.50438215_pgfId-1298614" xreflabel=""/><emphasis role="bold">stripe_offset</emphasis></para></entry>
 398                 <entry><para> <anchor xml:id="dbdoclet.50438215_pgfId-1298678" xreflabel=""/>Specifies an OST index from which the file should start. The default value is -1.</para></entry>
 399               </row>
 400               <row>
 401                 <entry><para> <anchor xml:id="dbdoclet.50438215_pgfId-1298618" xreflabel=""/><emphasis role="bold">stripe_count</emphasis></para></entry>
 402                 <entry><para> <anchor xml:id="dbdoclet.50438215_pgfId-1298687" xreflabel=""/>Specifies the number of OSTs to stripe the file across. The default value is -1.</para></entry>
 403               </row>
 404               <row>
 405                 <entry><para> <anchor xml:id="dbdoclet.50438215_pgfId-1298693" xreflabel=""/><emphasis role="bold">stripe_pattern</emphasis></para></entry>
 406                 <entry><para> <anchor xml:id="dbdoclet.50438215_pgfId-1298705" xreflabel=""/>Specifies the striping pattern. In this version of Lustre, only LOV_PATTERN_RAID0 is available. The default value is 0.</para></entry>
 407               </row>
 408             </tbody>
 409           </tgroup>
 410         </informaltable>
 411       </section>
 412       <section remap="h5">
 413         <title><anchor xml:id="dbdoclet.50438215_pgfId-1298592" xreflabel=""/>Return Values</title>
 414         <para><anchor xml:id="dbdoclet.50438215_pgfId-1297430" xreflabel=""/>llapi_file_open() and llapi_file_create() return:</para>
 415         <para><anchor xml:id="dbdoclet.50438215_pgfId-1297431" xreflabel=""/><emphasis role="bold">&gt;=0</emphasis> On success, for llapi_file_open the return value is a file descriptor</para>
 416         <para><anchor xml:id="dbdoclet.50438215_pgfId-1297432" xreflabel=""/><emphasis role="bold">&lt;0</emphasis> On failure, the absolute value is an error code</para>
 417       </section>
 418       <section remap="h5">
 419         <title><anchor xml:id="dbdoclet.50438215_pgfId-1298750" xreflabel=""/>Errors</title>
 420         <informaltable frame="all">
 421           <tgroup cols="2">
 422             <colspec colname="c1" colwidth="50*"/>
 423             <colspec colname="c2" colwidth="50*"/>
 424             <thead>
 425               <row>
 426                 <entry><para><emphasis role="bold"><anchor xml:id="dbdoclet.50438215_pgfId-1297435" xreflabel=""/>Errors</emphasis></para></entry>
 427                 <entry><para><emphasis role="bold"><anchor xml:id="dbdoclet.50438215_pgfId-1297437" xreflabel=""/>Description</emphasis></para></entry>
 428               </row>
 429             </thead>
 430             <tbody>
 431               <row>
 432                 <entry><para> <anchor xml:id="dbdoclet.50438215_pgfId-1297439" xreflabel=""/><emphasis role="bold">EINVAL</emphasis></para></entry>
 433                 <entry><para> <anchor xml:id="dbdoclet.50438215_pgfId-1297441" xreflabel=""/><emphasis role="bold">stripe_size</emphasis> or <emphasis role="bold">stripe_offset</emphasis> or <emphasis role="bold">stripe_count</emphasis> or <emphasis role="bold">stripe_pattern</emphasis> is invalid.</para></entry>
 434               </row>
 435               <row>
 436                 <entry><para> <anchor xml:id="dbdoclet.50438215_pgfId-1297443" xreflabel=""/><emphasis role="bold">EEXIST</emphasis></para></entry>
 437                 <entry><para> <anchor xml:id="dbdoclet.50438215_pgfId-1298878" xreflabel=""/>Striping information has already been set and cannot be altered; <emphasis role="bold">name</emphasis> already exists.</para></entry>
 438               </row>
 439               <row>
 440                 <entry><para> <anchor xml:id="dbdoclet.50438215_pgfId-1297447" xreflabel=""/><emphasis role="bold">EALREADY</emphasis></para></entry>
 441                 <entry><para> <anchor xml:id="dbdoclet.50438215_pgfId-1297449" xreflabel=""/>Striping information has already been set and cannot be altered</para></entry>
 442               </row>
 443               <row>
 444                 <entry><para> <anchor xml:id="dbdoclet.50438215_pgfId-1297451" xreflabel=""/><emphasis role="bold">ENOTTY</emphasis></para></entry>
 445                 <entry><para> <anchor xml:id="dbdoclet.50438215_pgfId-1297453" xreflabel=""/><emphasis role="bold">name</emphasis> may not point to a Lustre filesystem.</para></entry>
 446               </row>
 447             </tbody>
 448           </tgroup>
 449         </informaltable>
 450       </section>
 451       <section remap="h5">
 452         <title><anchor xml:id="dbdoclet.50438215_pgfId-1297462" xreflabel=""/>Example</title>
 453         <screen><anchor xml:id="dbdoclet.50438215_pgfId-1297463" xreflabel=""/>#include &lt;sys/types.h&gt;
 454 <anchor xml:id="dbdoclet.50438215_pgfId-1297464" xreflabel=""/>#include &lt;sys/stat.h&gt;
 455 <anchor xml:id="dbdoclet.50438215_pgfId-1297465" xreflabel=""/>#include &lt;fcntl.h&gt;
 456 <anchor xml:id="dbdoclet.50438215_pgfId-1297466" xreflabel=""/>#include &lt;errno.h&gt;
 457 <anchor xml:id="dbdoclet.50438215_pgfId-1297467" xreflabel=""/>#include &lt;stdio.h&gt;
 458 <anchor xml:id="dbdoclet.50438215_pgfId-1297468" xreflabel=""/>#include &lt;liblustre.h&gt;
 459 <anchor xml:id="dbdoclet.50438215_pgfId-1297469" xreflabel=""/>#include &lt;lustre/lustre_idl.h&gt;
 460 <anchor xml:id="dbdoclet.50438215_pgfId-1297470" xreflabel=""/>#include &lt;lustre/liblustreapi.h&gt;
 461 <anchor xml:id="dbdoclet.50438215_pgfId-1297471" xreflabel=""/>#include &lt;lustre/lustre_user.h&gt;
 462 <anchor xml:id="dbdoclet.50438215_pgfId-1297472" xreflabel=""/>int main(int argc, char *argv[])
 463 <anchor xml:id="dbdoclet.50438215_pgfId-1297473" xreflabel=""/>{
 464 <anchor xml:id="dbdoclet.50438215_pgfId-1297474" xreflabel=""/>   int rc;
 465 <anchor xml:id="dbdoclet.50438215_pgfId-1297475" xreflabel=""/>   if (argc != 2)
 466 <anchor xml:id="dbdoclet.50438215_pgfId-1297476" xreflabel=""/>           return -1;
 467 <anchor xml:id="dbdoclet.50438215_pgfId-1297477" xreflabel=""/>   rc = llapi_file_create(argv[1], 1048576, 0, 2, LOV_PATTERN_RAID0);
 468 <anchor xml:id="dbdoclet.50438215_pgfId-1297478" xreflabel=""/>   if (rc &lt; 0) {
 469 <anchor xml:id="dbdoclet.50438215_pgfId-1297479" xreflabel=""/>           fprintf(stderr, &quot;file creation has failed, %s\n&quot;,         strerror\
 470 (-rc));
 471 <anchor xml:id="dbdoclet.50438215_pgfId-1297480" xreflabel=""/>           return -1;
 472 <anchor xml:id="dbdoclet.50438215_pgfId-1297481" xreflabel=""/>   }
 473 <anchor xml:id="dbdoclet.50438215_pgfId-1297482" xreflabel=""/>   printf(&quot;%s with stripe size 1048576, striped across 2 OSTs,&quot;
 474 <anchor xml:id="dbdoclet.50438215_pgfId-1297483" xreflabel=""/>           &quot; has been created!\n&quot;, argv[1]);
 475 <anchor xml:id="dbdoclet.50438215_pgfId-1297484" xreflabel=""/>   return 0;
 476 <anchor xml:id="dbdoclet.50438215_pgfId-1297485" xreflabel=""/>}
 477 </screen>
 478       </section>
 479     </section>
 480     <section remap="h2">
 481       <title>34.4 <anchor xml:id="dbdoclet.50438215_12433" xreflabel=""/>llapi_quotactl</title>
 482       <para><anchor xml:id="dbdoclet.50438215_pgfId-1297144" xreflabel=""/>Use llapi_quotactl to manipulate disk quotas on a Lustre file system.</para>
 483       <section remap="h5">
 484         <title><anchor xml:id="dbdoclet.50438215_pgfId-1297145" xreflabel=""/>Synopsis</title>
 485         <screen><anchor xml:id="dbdoclet.50438215_pgfId-1297146" xreflabel=""/>#include &lt;liblustre.h&gt;
 486 <anchor xml:id="dbdoclet.50438215_pgfId-1297147" xreflabel=""/>#include &lt;lustre/lustre_idl.h&gt;
 487 <anchor xml:id="dbdoclet.50438215_pgfId-1297148" xreflabel=""/>#include &lt;lustre/liblustreapi.h&gt;
 488 <anchor xml:id="dbdoclet.50438215_pgfId-1297149" xreflabel=""/>#include &lt;lustre/lustre_user.h&gt;
 489 <anchor xml:id="dbdoclet.50438215_pgfId-1297150" xreflabel=""/>int llapi_quotactl(char&quot; &quot; *mnt,&quot; &quot; struct if_quotactl&quot; &quot; *qctl)
 490 <anchor xml:id="dbdoclet.50438215_pgfId-1297151" xreflabel=""/>
 491 <anchor xml:id="dbdoclet.50438215_pgfId-1297152" xreflabel=""/>struct if_quotactl {
 492 <anchor xml:id="dbdoclet.50438215_pgfId-1297153" xreflabel=""/>        __u32                   qc_cmd;
 493 <anchor xml:id="dbdoclet.50438215_pgfId-1297154" xreflabel=""/>        __u32                   qc_type;
 494 <anchor xml:id="dbdoclet.50438215_pgfId-1297155" xreflabel=""/>        __u32                   qc_id;
 495 <anchor xml:id="dbdoclet.50438215_pgfId-1297156" xreflabel=""/>        __u32                   qc_stat;
 496 <anchor xml:id="dbdoclet.50438215_pgfId-1297157" xreflabel=""/>        struct obd_dqinfo       qc_dqinfo;
 497 <anchor xml:id="dbdoclet.50438215_pgfId-1297158" xreflabel=""/>        struct obd_dqblk        qc_dqblk;
 498 <anchor xml:id="dbdoclet.50438215_pgfId-1297159" xreflabel=""/>        char                    obd_type[16];
 499 <anchor xml:id="dbdoclet.50438215_pgfId-1297160" xreflabel=""/>        struct obd_uuid         obd_uuid;
 500 <anchor xml:id="dbdoclet.50438215_pgfId-1297161" xreflabel=""/>};
 501 <anchor xml:id="dbdoclet.50438215_pgfId-1297162" xreflabel=""/>struct obd_dqblk {
 502 <anchor xml:id="dbdoclet.50438215_pgfId-1297163" xreflabel=""/>        __u64 dqb_bhardlimit;
 503 <anchor xml:id="dbdoclet.50438215_pgfId-1297164" xreflabel=""/>        __u64 dqb_bsoftlimit;
 504 <anchor xml:id="dbdoclet.50438215_pgfId-1297165" xreflabel=""/>        __u64 dqb_curspace;
 505 <anchor xml:id="dbdoclet.50438215_pgfId-1297166" xreflabel=""/>        __u64 dqb_ihardlimit;
 506 <anchor xml:id="dbdoclet.50438215_pgfId-1297167" xreflabel=""/>        __u64 dqb_isoftlimit;
 507 <anchor xml:id="dbdoclet.50438215_pgfId-1297168" xreflabel=""/>        __u64 dqb_curinodes;
 508 <anchor xml:id="dbdoclet.50438215_pgfId-1297169" xreflabel=""/>        __u64 dqb_btime;
 509 <anchor xml:id="dbdoclet.50438215_pgfId-1297170" xreflabel=""/>        __u64 dqb_itime;
 510 <anchor xml:id="dbdoclet.50438215_pgfId-1297171" xreflabel=""/>        __u32 dqb_valid;
 511 <anchor xml:id="dbdoclet.50438215_pgfId-1297172" xreflabel=""/>        __u32 padding;
 512 <anchor xml:id="dbdoclet.50438215_pgfId-1297173" xreflabel=""/>};
 513 <anchor xml:id="dbdoclet.50438215_pgfId-1297174" xreflabel=""/>struct obd_dqinfo {
 514 <anchor xml:id="dbdoclet.50438215_pgfId-1297175" xreflabel=""/>        __u64 dqi_bgrace;
 515 <anchor xml:id="dbdoclet.50438215_pgfId-1297176" xreflabel=""/>        __u64 dqi_igrace;
 516 <anchor xml:id="dbdoclet.50438215_pgfId-1297177" xreflabel=""/>        __u32 dqi_flags;
 517 <anchor xml:id="dbdoclet.50438215_pgfId-1297178" xreflabel=""/>        __u32 dqi_valid;
 518 <anchor xml:id="dbdoclet.50438215_pgfId-1297179" xreflabel=""/>};
 519 <anchor xml:id="dbdoclet.50438215_pgfId-1297180" xreflabel=""/>struct obd_uuid {
 520 <anchor xml:id="dbdoclet.50438215_pgfId-1297181" xreflabel=""/>        char uuid[40];
 521 <anchor xml:id="dbdoclet.50438215_pgfId-1297182" xreflabel=""/>};
 522 </screen>
 523       </section>
 524       <section remap="h5">
 525         <title><anchor xml:id="dbdoclet.50438215_pgfId-1297183" xreflabel=""/>Description</title>
 526         <para><anchor xml:id="dbdoclet.50438215_pgfId-1297184" xreflabel=""/>The llapi_quotactl() command manipulates disk quotas on a Lustre file system mount. qc_cmd indicates a command to be applied to UID qc_id or GID qc_id.</para>
 527         <informaltable frame="all">
 528           <tgroup cols="2">
 529             <colspec colname="c1" colwidth="50*"/>
 530             <colspec colname="c2" colwidth="50*"/>
 531             <thead>
 532               <row>
 533                 <entry><para><emphasis role="bold"><anchor xml:id="dbdoclet.50438215_pgfId-1297187" xreflabel=""/>Option</emphasis></para></entry>
 534                 <entry><para><emphasis role="bold"><anchor xml:id="dbdoclet.50438215_pgfId-1297189" xreflabel=""/>Description</emphasis></para></entry>
 535               </row>
 536             </thead>
 537             <tbody>
 538               <row>
 539                 <entry><para> <anchor xml:id="dbdoclet.50438215_pgfId-1297191" xreflabel=""/><emphasis role="bold">LUSTRE_Q_QUOTAON</emphasis></para></entry>
 540                 <entry><para> <anchor xml:id="dbdoclet.50438215_pgfId-1297193" xreflabel=""/>Turns on quotas for a Lustre file system. <emphasis>qc_type</emphasis> is USRQUOTA, GRPQUOTA or UGQUOTA (both user and group quota). The quota files must exist. They are normally created with the llapi_quotacheck call. This call is restricted to the super user privilege.</para></entry>
 541               </row>
 542               <row>
 543                 <entry><para> <anchor xml:id="dbdoclet.50438215_pgfId-1297195" xreflabel=""/><emphasis role="bold">LUSTRE_Q_QUOTAOFF</emphasis></para></entry>
 544                 <entry><para> <anchor xml:id="dbdoclet.50438215_pgfId-1297197" xreflabel=""/>Turns off quotas for a Lustre file system. <emphasis>qc_type</emphasis> is USRQUOTA, GRPQUOTA or UGQUOTA (both user and group quota). This call is restricted to the super user privilege.</para></entry>
 545               </row>
 546               <row>
 547                 <entry><para> <anchor xml:id="dbdoclet.50438215_pgfId-1297199" xreflabel=""/><emphasis role="bold">LUSTRE_Q_GETQUOTA</emphasis></para></entry>
 548                 <entry><para> <anchor xml:id="dbdoclet.50438215_pgfId-1297201" xreflabel=""/>Gets disk quota limits and current usage for user or group <emphasis>qc_id</emphasis>. <emphasis>qc_type</emphasis> is USRQUOTA or GRPQUOTA. <emphasis>uuid</emphasis> may be filled with OBD UUID string to query quota information from a specific node. <emphasis>dqb_valid</emphasis> may be set nonzero to query information only from MDS. If <emphasis>uuid</emphasis> is an empty string and <emphasis>dqb_valid</emphasis> is zero then cluster-wide limits and usage are returned. On return, <emphasis>obd_dqblk</emphasis> contains the requested information (block limits unit is kilobyte). Quotas must be turned on before using this command.</para></entry>
 549               </row>
 550               <row>
 551                 <entry><para> <anchor xml:id="dbdoclet.50438215_pgfId-1297203" xreflabel=""/><emphasis role="bold">LUSTRE_Q_SETQUOTA</emphasis></para></entry>
 552                 <entry><para> <anchor xml:id="dbdoclet.50438215_pgfId-1297205" xreflabel=""/>Sets disk quota limits for user or group <emphasis>qc_id</emphasis>. <emphasis>qc_type</emphasis> is USRQUOTA or GRPQUOTA. <emphasis>dqb_valid</emphasis> must be set to QIF_ILIMITS, QIF_BLIMITS or QIF_LIMITS (both inode limits and block limits) dependent on updating limits. <emphasis>obd_dqblk</emphasis> must be filled with limits values (as set in <emphasis>dqb_valid</emphasis>, block limits unit is kilobyte). Quotas must be turned on before using this command.</para></entry>
 553               </row>
 554               <row>
 555                 <entry><para> <anchor xml:id="dbdoclet.50438215_pgfId-1297207" xreflabel=""/><emphasis role="bold">LUSTRE_Q_GETINFO</emphasis></para></entry>
 556                 <entry><para> <anchor xml:id="dbdoclet.50438215_pgfId-1297209" xreflabel=""/>Gets information about quotas. <emphasis>qc_type</emphasis> is either USRQUOTA or GRPQUOTA. 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></entry>
 557               </row>
 558               <row>
 559                 <entry><para> <anchor xml:id="dbdoclet.50438215_pgfId-1297211" xreflabel=""/><emphasis role="bold">LUSTRE_Q_SETINFO</emphasis></para></entry>
 560                 <entry><para> <anchor xml:id="dbdoclet.50438215_pgfId-1297213" xreflabel=""/>Sets quota information (like grace times). <emphasis>qc_type</emphasis> is either USRQUOTA or GRPQUOTA. <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></entry>
 561               </row>
 562             </tbody>
 563           </tgroup>
 564         </informaltable>
 565       </section>
 566       <section remap="h5">
 567         <title><anchor xml:id="dbdoclet.50438215_pgfId-1297216" xreflabel=""/>Return Values</title>
 568         <para><anchor xml:id="dbdoclet.50438215_pgfId-1298911" xreflabel=""/>llapi_quotactl() returns:</para>
 569         <para><anchor xml:id="dbdoclet.50438215_pgfId-1298922" xreflabel=""/><emphasis role="bold">0</emphasis> On success</para>
 570         <para><anchor xml:id="dbdoclet.50438215_pgfId-1298923" xreflabel=""/><emphasis role="bold">-1</emphasis> On failure and sets error number (errno) to indicate the error</para>
 571       </section>
 572       <section remap="h5">
 573         <title><anchor xml:id="dbdoclet.50438215_pgfId-1297220" xreflabel=""/>Errors</title>
 574         <para><anchor xml:id="dbdoclet.50438215_pgfId-1297258" xreflabel=""/>llapi_quotactl errors are described below.</para>
 575         <informaltable frame="all">
 576           <tgroup cols="2">
 577             <colspec colname="c1" colwidth="50*"/>
 578             <colspec colname="c2" colwidth="50*"/>
 579             <thead>
 580               <row>
 581                 <entry><para><emphasis role="bold"><anchor xml:id="dbdoclet.50438215_pgfId-1297223" xreflabel=""/>Errors</emphasis></para></entry>
 582                 <entry><para><emphasis role="bold"><anchor xml:id="dbdoclet.50438215_pgfId-1297225" xreflabel=""/>Description</emphasis></para></entry>
 583               </row>
 584             </thead>
 585             <tbody>
 586               <row>
 587                 <entry><para> <anchor xml:id="dbdoclet.50438215_pgfId-1297227" xreflabel=""/><emphasis role="bold">EFAULT</emphasis></para></entry>
 588                 <entry><para> <anchor xml:id="dbdoclet.50438215_pgfId-1298931" xreflabel=""/><emphasis>qctl</emphasis> is invalid.</para></entry>
 589               </row>
 590               <row>
 591                 <entry><para> <anchor xml:id="dbdoclet.50438215_pgfId-1297231" xreflabel=""/><emphasis role="bold">ENOSYS</emphasis></para></entry>
 592                 <entry><para> <anchor xml:id="dbdoclet.50438215_pgfId-1298933" xreflabel=""/>Kernel or Lustre modules have not been compiled with the QUOTA option.</para></entry>
 593               </row>
 594               <row>
 595                 <entry><para> <anchor xml:id="dbdoclet.50438215_pgfId-1297235" xreflabel=""/><emphasis role="bold">ENOMEM</emphasis></para></entry>
 596                 <entry><para> <anchor xml:id="dbdoclet.50438215_pgfId-1298935" xreflabel=""/>Insufficient memory to complete operation.</para></entry>
 597               </row>
 598               <row>
 599                 <entry><para> <anchor xml:id="dbdoclet.50438215_pgfId-1297239" xreflabel=""/><emphasis role="bold">ENOTTY</emphasis></para></entry>
 600                 <entry><para> <anchor xml:id="dbdoclet.50438215_pgfId-1298937" xreflabel=""/><emphasis>qc_cmd</emphasis> is invalid.</para></entry>
 601               </row>
 602               <row>
 603                 <entry><para> <anchor xml:id="dbdoclet.50438215_pgfId-1297243" xreflabel=""/><emphasis role="bold">EBUSY</emphasis></para></entry>
 604                 <entry><para> <anchor xml:id="dbdoclet.50438215_pgfId-1298939" xreflabel=""/> Cannot process during quotacheck.</para></entry>
 605               </row>
 606               <row>
 607                 <entry><para> <anchor xml:id="dbdoclet.50438215_pgfId-1297247" xreflabel=""/><emphasis role="bold">ENOENT</emphasis></para></entry>
 608                 <entry><para> <anchor xml:id="dbdoclet.50438215_pgfId-1298941" xreflabel=""/><emphasis>uuid</emphasis> does not correspond to OBD or <emphasis>mnt</emphasis> does not exist.</para></entry>
 609               </row>
 610               <row>
 611                 <entry><para> <anchor xml:id="dbdoclet.50438215_pgfId-1297251" xreflabel=""/><emphasis role="bold">EPERM</emphasis></para></entry>
 612                 <entry><para> <anchor xml:id="dbdoclet.50438215_pgfId-1298943" xreflabel=""/> The call is privileged and the caller is not the super user.</para></entry>
 613               </row>
 614               <row>
 615                 <entry><para> <anchor xml:id="dbdoclet.50438215_pgfId-1297255" xreflabel=""/><emphasis role="bold">ESRCH</emphasis></para></entry>
 616                 <entry><para> <anchor xml:id="dbdoclet.50438215_pgfId-1298945" xreflabel=""/> No disk quota is found for the indicated user. Quotas have not been turned on for this file system.</para></entry>
 617               </row>
 618             </tbody>
 619           </tgroup>
 620         </informaltable>
 621        </section>
 622     </section>
 623     <section remap="h2">
 624       <title>34.5 <anchor xml:id="dbdoclet.50438215_15718" xreflabel=""/>llapi_path2fid</title>
 625       <para><anchor xml:id="dbdoclet.50438215_pgfId-1297262" xreflabel=""/>Use llapi_path2fid to get the FID from the pathname.</para>
 626       <section remap="h5">
 627         <title><anchor xml:id="dbdoclet.50438215_pgfId-1297263" xreflabel=""/>Synopsis</title>
 628         <screen><anchor xml:id="dbdoclet.50438215_pgfId-1297264" xreflabel=""/>#include &lt;lustre/liblustreapi.h&gt;
 629 <anchor xml:id="dbdoclet.50438215_pgfId-1297265" xreflabel=""/>#include &lt;lustre/lustre_user.h&gt;
 630 <anchor xml:id="dbdoclet.50438215_pgfId-1297266" xreflabel=""/>
 631 <anchor xml:id="dbdoclet.50438215_pgfId-1297267" xreflabel=""/>int llapi_path2fid(const char *path, unsigned long long *seq, unsigned long\
 632  *oid, unsigned long *ver)
 633 </screen>
 634       </section>
 635       <section remap="h5">
 636         <title><anchor xml:id="dbdoclet.50438215_pgfId-1297268" xreflabel=""/>Description</title>
 637         <para><anchor xml:id="dbdoclet.50438215_pgfId-1297269" xreflabel=""/>The llapi_path2fid function returns the FID (sequence : object ID : version) for the pathname.</para>
 638       </section>
 639       <section remap="h5">
 640         <title><anchor xml:id="dbdoclet.50438215_pgfId-1297270" xreflabel=""/>Return Values</title>
 641         <para><anchor xml:id="dbdoclet.50438215_pgfId-1297271" xreflabel=""/>llapi_path2fid returns:</para>
 642         <para><anchor xml:id="dbdoclet.50438215_pgfId-1297272" xreflabel=""/><emphasis role="bold">0</emphasis> On success</para>
 643         <para><anchor xml:id="dbdoclet.50438215_pgfId-1297273" xreflabel=""/>non-zero value On failure</para>
 644       </section>
 645     </section>
 646     <section remap="h2">
 647       <title>34.6 Example <anchor xml:id="dbdoclet.50438215_marker-1297700" xreflabel=""/>Using the llapi Library</title>
 648       <para><anchor xml:id="dbdoclet.50438215_pgfId-1297702" xreflabel=""/>Use llapi_file_create 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 <link xl:href="ConfigurationFilesModuleParameters.html#50438293_72504">Chapter 35</link>: <link xl:href="ConfigurationFilesModuleParameters.html#50438293_66186">Configuration Files and Module Parameters</link>.</para>
 649       <para><anchor xml:id="dbdoclet.50438215_pgfId-1297709" xreflabel=""/>You can set striping from inside programs like ioctl. To compile the sample program, you need to download libtest.c and liblustreapi.c files from the Lustre source tree.</para>
 650       <para><anchor xml:id="dbdoclet.50438215_pgfId-1297710" xreflabel=""/><emphasis role="bold">A simple C program to demonstrate striping API - libtest.c</emphasis></para>
 651       <screen><anchor xml:id="dbdoclet.50438215_pgfId-1297711" xreflabel=""/>/* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
 652 <anchor xml:id="dbdoclet.50438215_pgfId-1297712" xreflabel=""/> * vim:expandtab:shiftwidth=8:tabstop=8:
 653 <anchor xml:id="dbdoclet.50438215_pgfId-1297713" xreflabel=""/> *
 654 <anchor xml:id="dbdoclet.50438215_pgfId-1297714" xreflabel=""/> * lustredemo - simple code examples of liblustreapi functions
 655 <anchor xml:id="dbdoclet.50438215_pgfId-1297715" xreflabel=""/> */
 656 <anchor xml:id="dbdoclet.50438215_pgfId-1297716" xreflabel=""/>
 657 <anchor xml:id="dbdoclet.50438215_pgfId-1297717" xreflabel=""/>#include &lt;stdio.h&gt;
 658 <anchor xml:id="dbdoclet.50438215_pgfId-1297718" xreflabel=""/>#include &lt;fcntl.h&gt;
 659 <anchor xml:id="dbdoclet.50438215_pgfId-1297719" xreflabel=""/>#include &lt;sys/stat.h&gt;
 660 <anchor xml:id="dbdoclet.50438215_pgfId-1297720" xreflabel=""/>#include &lt;sys/types.h&gt;
 661 <anchor xml:id="dbdoclet.50438215_pgfId-1297721" xreflabel=""/>#include &lt;dirent.h&gt;
 662 <anchor xml:id="dbdoclet.50438215_pgfId-1297722" xreflabel=""/>#include &lt;errno.h&gt;
 663 <anchor xml:id="dbdoclet.50438215_pgfId-1297723" xreflabel=""/>#include &lt;string.h&gt;
 664 <anchor xml:id="dbdoclet.50438215_pgfId-1297724" xreflabel=""/>#include &lt;unistd.h&gt;
 665 <anchor xml:id="dbdoclet.50438215_pgfId-1297725" xreflabel=""/>#include &lt;stdlib.h&gt;
 666 <anchor xml:id="dbdoclet.50438215_pgfId-1297726" xreflabel=""/>#include &lt;lustre/liblustreapi.h&gt;
 667 <anchor xml:id="dbdoclet.50438215_pgfId-1297727" xreflabel=""/>#include &lt;lustre/lustre_user.h&gt;
 668 <anchor xml:id="dbdoclet.50438215_pgfId-1297728" xreflabel=""/>#define MAX_OSTS 1024
 669 <anchor xml:id="dbdoclet.50438215_pgfId-1297729" xreflabel=""/>#define LOV_EA_SIZE(lum, num) (sizeof(*lum) + num * sizeof(*lum-&gt;lmm_objects\
 670 ))
 671 <anchor xml:id="dbdoclet.50438215_pgfId-1297730" xreflabel=""/>#define LOV_EA_MAX(lum) LOV_EA_SIZE(lum, MAX_OSTS)
 672 <anchor xml:id="dbdoclet.50438215_pgfId-1297731" xreflabel=""/>
 673 <anchor xml:id="dbdoclet.50438215_pgfId-1297732" xreflabel=""/>/*
 674 <anchor xml:id="dbdoclet.50438215_pgfId-1297733" xreflabel=""/>This program provides crude examples of using the liblustre API functions
 675 <anchor xml:id="dbdoclet.50438215_pgfId-1297734" xreflabel=""/>*/
 676 <anchor xml:id="dbdoclet.50438215_pgfId-1297735" xreflabel=""/>
 677 <anchor xml:id="dbdoclet.50438215_pgfId-1297736" xreflabel=""/>/* Change these definitions to suit */
 678 <anchor xml:id="dbdoclet.50438215_pgfId-1297737" xreflabel=""/>
 679 <anchor xml:id="dbdoclet.50438215_pgfId-1297738" xreflabel=""/>#define TESTDIR &quot;/tmp&quot;                                                   /* R\
 680 esults directory */
 681 <anchor xml:id="dbdoclet.50438215_pgfId-1297739" xreflabel=""/>#define TESTFILE &quot;lustre_dummy&quot;                                              \
 682     /* Name for the file we create/destroy */
 683 <anchor xml:id="dbdoclet.50438215_pgfId-1297740" xreflabel=""/>#define FILESIZE 262144                                                    \
 684 /* Size of the file in words */
 685 <anchor xml:id="dbdoclet.50438215_pgfId-1297741" xreflabel=""/>#define DUMWORD &quot;DEADBEEF&quot;                                                   \
 686     /* Dummy word used to fill files */
 687 <anchor xml:id="dbdoclet.50438215_pgfId-1297742" xreflabel=""/>#define MY_STRIPE_WIDTH 2                                                  \
 688 /* Set this to the number of OST required */
 689 <anchor xml:id="dbdoclet.50438215_pgfId-1297743" xreflabel=""/>#define MY_LUSTRE_DIR &quot;/mnt/lustre/ftest&quot;
 690 <anchor xml:id="dbdoclet.50438215_pgfId-1297744" xreflabel=""/>
 691 <anchor xml:id="dbdoclet.50438215_pgfId-1297745" xreflabel=""/>
 692 <anchor xml:id="dbdoclet.50438215_pgfId-1297746" xreflabel=""/>int close_file(int fd)
 693 <anchor xml:id="dbdoclet.50438215_pgfId-1297747" xreflabel=""/>{
 694 <anchor xml:id="dbdoclet.50438215_pgfId-1297748" xreflabel=""/>   if (close(fd) &lt; 0) {
 695 <anchor xml:id="dbdoclet.50438215_pgfId-1297749" xreflabel=""/>           fprintf(stderr, &quot;File close failed: %d (%s)\n&quot;, errno, strerror(er\
 696 rno));
 697 <anchor xml:id="dbdoclet.50438215_pgfId-1297750" xreflabel=""/>           return -1;
 698 <anchor xml:id="dbdoclet.50438215_pgfId-1297751" xreflabel=""/>   }
 699 <anchor xml:id="dbdoclet.50438215_pgfId-1297752" xreflabel=""/>   return 0;
 700 <anchor xml:id="dbdoclet.50438215_pgfId-1297753" xreflabel=""/>}
 701 <anchor xml:id="dbdoclet.50438215_pgfId-1297754" xreflabel=""/>
 702 <anchor xml:id="dbdoclet.50438215_pgfId-1297755" xreflabel=""/>int write_file(int fd)
 703 <anchor xml:id="dbdoclet.50438215_pgfId-1297756" xreflabel=""/>{
 704 <anchor xml:id="dbdoclet.50438215_pgfId-1297757" xreflabel=""/>   char *stng =  DUMWORD;
 705 <anchor xml:id="dbdoclet.50438215_pgfId-1297758" xreflabel=""/>   int cnt = 0;
 706 <anchor xml:id="dbdoclet.50438215_pgfId-1297759" xreflabel=""/>
 707 <anchor xml:id="dbdoclet.50438215_pgfId-1297760" xreflabel=""/>   for( cnt = 0; cnt &lt; FILESIZE; cnt++) {
 708 <anchor xml:id="dbdoclet.50438215_pgfId-1297761" xreflabel=""/>                write(fd, stng, sizeof(stng));
 709 <anchor xml:id="dbdoclet.50438215_pgfId-1297762" xreflabel=""/>   }
 710 <anchor xml:id="dbdoclet.50438215_pgfId-1297763" xreflabel=""/>   return 0;
 711 <anchor xml:id="dbdoclet.50438215_pgfId-1297764" xreflabel=""/>}
 712 <anchor xml:id="dbdoclet.50438215_pgfId-1297765" xreflabel=""/>/* Open a file, set a specific stripe count, size and starting OST
 713 <anchor xml:id="dbdoclet.50438215_pgfId-1297766" xreflabel=""/>   Adjust the parameters to suit */
 714 <anchor xml:id="dbdoclet.50438215_pgfId-1297767" xreflabel=""/>
 715 <anchor xml:id="dbdoclet.50438215_pgfId-1297768" xreflabel=""/>int open_stripe_file()
 716 <anchor xml:id="dbdoclet.50438215_pgfId-1297769" xreflabel=""/>{
 717 <anchor xml:id="dbdoclet.50438215_pgfId-1297770" xreflabel=""/>   char *tfile = TESTFILE;
 718 <anchor xml:id="dbdoclet.50438215_pgfId-1297771" xreflabel=""/>   int stripe_size = 65536;                                                \
 719                                 /* System default is 4M */
 720 <anchor xml:id="dbdoclet.50438215_pgfId-1297772" xreflabel=""/>   int stripe_offset = -1;                                                 \
 721                         /* Start at default */
 722 <anchor xml:id="dbdoclet.50438215_pgfId-1297773" xreflabel=""/>   int stripe_count = MY_STRIPE_WIDTH;                                     \
 723                                         /*Single stripe for this demo*/
 724 <anchor xml:id="dbdoclet.50438215_pgfId-1297774" xreflabel=""/>   int stripe_pattern = 0;                                                 \
 725                                 /* only RAID 0 at this time */
 726 <anchor xml:id="dbdoclet.50438215_pgfId-1297775" xreflabel=""/>   int rc, fd;
 727 <anchor xml:id="dbdoclet.50438215_pgfId-1297776" xreflabel=""/>   /*
 728 <anchor xml:id="dbdoclet.50438215_pgfId-1297777" xreflabel=""/>   */
 729 <anchor xml:id="dbdoclet.50438215_pgfId-1297778" xreflabel=""/>   rc = llapi_file_create(tfile,
 730 <anchor xml:id="dbdoclet.50438215_pgfId-1297779" xreflabel=""/>stripe_size,stripe_offset,stripe_count,stripe_pattern);
 731 <anchor xml:id="dbdoclet.50438215_pgfId-1297780" xreflabel=""/>   /* result code is inverted, we may return -EINVAL or an ioctl error.
 732 <anchor xml:id="dbdoclet.50438215_pgfId-1297781" xreflabel=""/>   We borrow an error message from sanity.c
 733 <anchor xml:id="dbdoclet.50438215_pgfId-1297782" xreflabel=""/>   */
 734 <anchor xml:id="dbdoclet.50438215_pgfId-1297783" xreflabel=""/>   if (rc) {
 735 <anchor xml:id="dbdoclet.50438215_pgfId-1297784" xreflabel=""/>                fprintf(stderr,&quot;llapi_file_create failed: %d (%s) \n&quot;, rc, st\
 736 rerror(-rc));
 737 <anchor xml:id="dbdoclet.50438215_pgfId-1297785" xreflabel=""/>                return -1;
 738 <anchor xml:id="dbdoclet.50438215_pgfId-1297786" xreflabel=""/>        }
 739 <anchor xml:id="dbdoclet.50438215_pgfId-1297787" xreflabel=""/>        /* llapi_file_create closes the file descriptor, we must re-open */
 740 <anchor xml:id="dbdoclet.50438215_pgfId-1297788" xreflabel=""/>        fd = open(tfile, O_CREAT | O_RDWR | O_LOV_DELAY_CREATE, 0644);
 741 <anchor xml:id="dbdoclet.50438215_pgfId-1297789" xreflabel=""/>        if (fd &lt; 0) {
 742 <anchor xml:id="dbdoclet.50438215_pgfId-1297790" xreflabel=""/>                fprintf(stderr, &quot;Can&apos;t open %s file: %d (%s)\n&quot;, tfile, errno\
 743 , strerror(errno));
 744 <anchor xml:id="dbdoclet.50438215_pgfId-1297791" xreflabel=""/>           return -1;
 745 <anchor xml:id="dbdoclet.50438215_pgfId-1297792" xreflabel=""/>        }
 746 <anchor xml:id="dbdoclet.50438215_pgfId-1297793" xreflabel=""/>        return fd;
 747 <anchor xml:id="dbdoclet.50438215_pgfId-1297794" xreflabel=""/>}
 748 <anchor xml:id="dbdoclet.50438215_pgfId-1297795" xreflabel=""/>
 749 <anchor xml:id="dbdoclet.50438215_pgfId-1297796" xreflabel=""/>/* output a list of uuids for this file */
 750 <anchor xml:id="dbdoclet.50438215_pgfId-1297797" xreflabel=""/>int get_my_uuids(int fd)
 751 <anchor xml:id="dbdoclet.50438215_pgfId-1297798" xreflabel=""/>{
 752 <anchor xml:id="dbdoclet.50438215_pgfId-1297799" xreflabel=""/>   struct obd_uuid uuids[1024], *uuidp;                                    \
 753                                                 /* Output var */
 754 <anchor xml:id="dbdoclet.50438215_pgfId-1297800" xreflabel=""/>   int obdcount = 1024;
 755 <anchor xml:id="dbdoclet.50438215_pgfId-1297801" xreflabel=""/>   int rc,i;
 756 <anchor xml:id="dbdoclet.50438215_pgfId-1297802" xreflabel=""/>
 757 <anchor xml:id="dbdoclet.50438215_pgfId-1297803" xreflabel=""/>   rc = llapi_lov_get_uuids(fd, uuids, &amp;obdcount);
 758 <anchor xml:id="dbdoclet.50438215_pgfId-1297804" xreflabel=""/>   if (rc != 0) {
 759 <anchor xml:id="dbdoclet.50438215_pgfId-1297805" xreflabel=""/>           fprintf(stderr, &quot;get uuids failed: %d (%s)\n&quot;,errno, strerror(errn\
 760 o));
 761 <anchor xml:id="dbdoclet.50438215_pgfId-1297806" xreflabel=""/>        }
 762 <anchor xml:id="dbdoclet.50438215_pgfId-1297807" xreflabel=""/>        printf(&quot;This file system has %d obds\n&quot;, obdcount);
 763 <anchor xml:id="dbdoclet.50438215_pgfId-1297808" xreflabel=""/>        for (i = 0, uuidp = uuids; i &lt; obdcount; i++, uuidp++) {
 764 <anchor xml:id="dbdoclet.50438215_pgfId-1297809" xreflabel=""/>           printf(&quot;UUID %d is %s\n&quot;,i, uuidp-&gt;uuid);
 765 <anchor xml:id="dbdoclet.50438215_pgfId-1297810" xreflabel=""/>        }
 766 <anchor xml:id="dbdoclet.50438215_pgfId-1297811" xreflabel=""/>        return 0;
 767 <anchor xml:id="dbdoclet.50438215_pgfId-1297812" xreflabel=""/>}
 768 <anchor xml:id="dbdoclet.50438215_pgfId-1297813" xreflabel=""/>
 769 <anchor xml:id="dbdoclet.50438215_pgfId-1297814" xreflabel=""/>/* Print out some LOV attributes. List our objects */
 770 <anchor xml:id="dbdoclet.50438215_pgfId-1297815" xreflabel=""/>int get_file_info(char *path)
 771 <anchor xml:id="dbdoclet.50438215_pgfId-1297816" xreflabel=""/>{
 772 <anchor xml:id="dbdoclet.50438215_pgfId-1297817" xreflabel=""/>
 773 <anchor xml:id="dbdoclet.50438215_pgfId-1297818" xreflabel=""/>   struct lov_user_md *lump;
 774 <anchor xml:id="dbdoclet.50438215_pgfId-1297819" xreflabel=""/>   int rc;
 775 <anchor xml:id="dbdoclet.50438215_pgfId-1297820" xreflabel=""/>   int i;
 776 <anchor xml:id="dbdoclet.50438215_pgfId-1297821" xreflabel=""/>
 777 <anchor xml:id="dbdoclet.50438215_pgfId-1297822" xreflabel=""/>   lump = malloc(LOV_EA_MAX(lump));
 778 <anchor xml:id="dbdoclet.50438215_pgfId-1297823" xreflabel=""/>   if (lump == NULL) {
 779 <anchor xml:id="dbdoclet.50438215_pgfId-1297824" xreflabel=""/>           return -1;
 780 <anchor xml:id="dbdoclet.50438215_pgfId-1297825" xreflabel=""/>        }
 781 <anchor xml:id="dbdoclet.50438215_pgfId-1297826" xreflabel=""/>
 782 <anchor xml:id="dbdoclet.50438215_pgfId-1297827" xreflabel=""/>        rc = llapi_file_get_stripe(path, lump);
 783 <anchor xml:id="dbdoclet.50438215_pgfId-1297828" xreflabel=""/>
 784 <anchor xml:id="dbdoclet.50438215_pgfId-1297829" xreflabel=""/>        if (rc != 0) {
 785 <anchor xml:id="dbdoclet.50438215_pgfId-1297830" xreflabel=""/>           fprintf(stderr, &quot;get_stripe failed: %d (%s)\n&quot;,errno, strerror(err\
 786 no));
 787 <anchor xml:id="dbdoclet.50438215_pgfId-1297831" xreflabel=""/>           return -1;
 788 <anchor xml:id="dbdoclet.50438215_pgfId-1297832" xreflabel=""/>        }
 789 <anchor xml:id="dbdoclet.50438215_pgfId-1297833" xreflabel=""/>
 790 <anchor xml:id="dbdoclet.50438215_pgfId-1297834" xreflabel=""/>   printf(&quot;Lov magic %u\n&quot;, lump-&gt;lmm_magic);
 791 <anchor xml:id="dbdoclet.50438215_pgfId-1297835" xreflabel=""/>   printf(&quot;Lov pattern %u\n&quot;, lump-&gt;lmm_pattern);
 792 <anchor xml:id="dbdoclet.50438215_pgfId-1297836" xreflabel=""/>   printf(&quot;Lov object id %llu\n&quot;, lump-&gt;lmm_object_id);
 793 <anchor xml:id="dbdoclet.50438215_pgfId-1297837" xreflabel=""/>   printf(&quot;Lov object group %llu\n&quot;, lump-&gt;lmm_object_gr);
 794 <anchor xml:id="dbdoclet.50438215_pgfId-1297838" xreflabel=""/>   printf(&quot;Lov stripe size %u\n&quot;, lump-&gt;lmm_stripe_size);
 795 <anchor xml:id="dbdoclet.50438215_pgfId-1297839" xreflabel=""/>   printf(&quot;Lov stripe count %hu\n&quot;, lump-&gt;lmm_stripe_count);
 796 <anchor xml:id="dbdoclet.50438215_pgfId-1297840" xreflabel=""/>   printf(&quot;Lov stripe offset %u\n&quot;, lump-&gt;lmm_stripe_offset);
 797 <anchor xml:id="dbdoclet.50438215_pgfId-1297841" xreflabel=""/>   for (i = 0; i &lt; lump-&gt;lmm_stripe_count; i++) {
 798 <anchor xml:id="dbdoclet.50438215_pgfId-1297842" xreflabel=""/>           printf(&quot;Object index %d Objid %llu\n&quot;, lump-&gt;lmm_objects[i].l_ost_i\
 799 dx, lump-&gt;lmm_objects[i].l_object_id);
 800 <anchor xml:id="dbdoclet.50438215_pgfId-1297843" xreflabel=""/>        }
 801 <anchor xml:id="dbdoclet.50438215_pgfId-1297844" xreflabel=""/>
 802 <anchor xml:id="dbdoclet.50438215_pgfId-1297845" xreflabel=""/>
 803 <anchor xml:id="dbdoclet.50438215_pgfId-1297846" xreflabel=""/>   free(lump);
 804 <anchor xml:id="dbdoclet.50438215_pgfId-1297847" xreflabel=""/>   return rc;
 805 <anchor xml:id="dbdoclet.50438215_pgfId-1297848" xreflabel=""/>
 806 <anchor xml:id="dbdoclet.50438215_pgfId-1297849" xreflabel=""/>}
 807 <anchor xml:id="dbdoclet.50438215_pgfId-1297850" xreflabel=""/>/* Ping all OSTs that belong to this filesysem */
 808 <anchor xml:id="dbdoclet.50438215_pgfId-1297851" xreflabel=""/>
 809 <anchor xml:id="dbdoclet.50438215_pgfId-1297852" xreflabel=""/>int ping_osts()
 810 <anchor xml:id="dbdoclet.50438215_pgfId-1297853" xreflabel=""/>{
 811 <anchor xml:id="dbdoclet.50438215_pgfId-1297854" xreflabel=""/>   DIR *dir;
 812 <anchor xml:id="dbdoclet.50438215_pgfId-1297855" xreflabel=""/>   struct dirent *d;
 813 <anchor xml:id="dbdoclet.50438215_pgfId-1297856" xreflabel=""/>   char osc_dir[100];
 814 <anchor xml:id="dbdoclet.50438215_pgfId-1297857" xreflabel=""/>   int rc;
 815 <anchor xml:id="dbdoclet.50438215_pgfId-1297858" xreflabel=""/>
 816 <anchor xml:id="dbdoclet.50438215_pgfId-1297859" xreflabel=""/>   sprintf(osc_dir, &quot;/proc/fs/lustre/osc&quot;);
 817 <anchor xml:id="dbdoclet.50438215_pgfId-1297860" xreflabel=""/>   dir = opendir(osc_dir);
 818 <anchor xml:id="dbdoclet.50438215_pgfId-1297861" xreflabel=""/>   if (dir == NULL) {
 819 <anchor xml:id="dbdoclet.50438215_pgfId-1297862" xreflabel=""/>           printf(&quot;Can&apos;t open dir\n&quot;);
 820 <anchor xml:id="dbdoclet.50438215_pgfId-1297863" xreflabel=""/>           return -1;
 821 <anchor xml:id="dbdoclet.50438215_pgfId-1297864" xreflabel=""/>   }
 822 <anchor xml:id="dbdoclet.50438215_pgfId-1297865" xreflabel=""/>   while((d = readdir(dir)) != NULL) {
 823 <anchor xml:id="dbdoclet.50438215_pgfId-1297866" xreflabel=""/>           if ( d-&gt;d_type == DT_DIR ) {
 824 <anchor xml:id="dbdoclet.50438215_pgfId-1297867" xreflabel=""/>                   if (! strncmp(d-&gt;d_name, &quot;OSC&quot;, 3)) {
 825 <anchor xml:id="dbdoclet.50438215_pgfId-1297868" xreflabel=""/>                           printf(&quot;Pinging OSC %s &quot;, d-&gt;d_name);
 826 <anchor xml:id="dbdoclet.50438215_pgfId-1297869" xreflabel=""/>                           rc = llapi_ping(&quot;osc&quot;, d-&gt;d_name);
 827 <anchor xml:id="dbdoclet.50438215_pgfId-1297870" xreflabel=""/>                           if (rc) {
 828 <anchor xml:id="dbdoclet.50438215_pgfId-1297871" xreflabel=""/>                                   printf(&quot;  bad\n&quot;);
 829 <anchor xml:id="dbdoclet.50438215_pgfId-1297872" xreflabel=""/>                           } else {
 830 <anchor xml:id="dbdoclet.50438215_pgfId-1297873" xreflabel=""/>                                   printf(&quot;  good\n&quot;);
 831 <anchor xml:id="dbdoclet.50438215_pgfId-1297874" xreflabel=""/>                           }
 832 <anchor xml:id="dbdoclet.50438215_pgfId-1297875" xreflabel=""/>                   }
 833 <anchor xml:id="dbdoclet.50438215_pgfId-1297876" xreflabel=""/>           }
 834 <anchor xml:id="dbdoclet.50438215_pgfId-1297877" xreflabel=""/>   }
 835 <anchor xml:id="dbdoclet.50438215_pgfId-1297878" xreflabel=""/>   return 0;
 836 <anchor xml:id="dbdoclet.50438215_pgfId-1297879" xreflabel=""/>
 837 <anchor xml:id="dbdoclet.50438215_pgfId-1297880" xreflabel=""/>}
 838 <anchor xml:id="dbdoclet.50438215_pgfId-1297881" xreflabel=""/>
 839 <anchor xml:id="dbdoclet.50438215_pgfId-1297882" xreflabel=""/>int main()
 840 <anchor xml:id="dbdoclet.50438215_pgfId-1297883" xreflabel=""/>{
 841 <anchor xml:id="dbdoclet.50438215_pgfId-1297884" xreflabel=""/>   int file;
 842 <anchor xml:id="dbdoclet.50438215_pgfId-1297885" xreflabel=""/>   int rc;
 843 <anchor xml:id="dbdoclet.50438215_pgfId-1297886" xreflabel=""/>   char filename[100];
 844 <anchor xml:id="dbdoclet.50438215_pgfId-1297887" xreflabel=""/>   char sys_cmd[100];
 845 <anchor xml:id="dbdoclet.50438215_pgfId-1297888" xreflabel=""/>
 846 <anchor xml:id="dbdoclet.50438215_pgfId-1297889" xreflabel=""/>   sprintf(filename, &quot;%s/%s&quot;,MY_LUSTRE_DIR, TESTFILE);
 847 <anchor xml:id="dbdoclet.50438215_pgfId-1297890" xreflabel=""/>
 848 <anchor xml:id="dbdoclet.50438215_pgfId-1297891" xreflabel=""/>   printf(&quot;Open a file with striping\n&quot;);
 849 <anchor xml:id="dbdoclet.50438215_pgfId-1297892" xreflabel=""/>   file = open_stripe_file();
 850 <anchor xml:id="dbdoclet.50438215_pgfId-1297893" xreflabel=""/>   if ( file &lt; 0 ) {
 851 <anchor xml:id="dbdoclet.50438215_pgfId-1297894" xreflabel=""/>           printf(&quot;Exiting\n&quot;);
 852 <anchor xml:id="dbdoclet.50438215_pgfId-1297895" xreflabel=""/>           exit(1);
 853 <anchor xml:id="dbdoclet.50438215_pgfId-1297896" xreflabel=""/>
 854 <anchor xml:id="dbdoclet.50438215_pgfId-1297897" xreflabel=""/>
 855 <anchor xml:id="dbdoclet.50438215_pgfId-1297898" xreflabel=""/>
 856 <anchor xml:id="dbdoclet.50438215_pgfId-1297899" xreflabel=""/>
 857 <anchor xml:id="dbdoclet.50438215_pgfId-1297900" xreflabel=""/>   }
 858 <anchor xml:id="dbdoclet.50438215_pgfId-1297901" xreflabel=""/>   printf(&quot;Getting uuid list\n&quot;);
 859 <anchor xml:id="dbdoclet.50438215_pgfId-1297902" xreflabel=""/>   rc = get_my_uuids(file);
 860 <anchor xml:id="dbdoclet.50438215_pgfId-1297903" xreflabel=""/>   rintf(&quot;Write to the file\n&quot;);
 861 <anchor xml:id="dbdoclet.50438215_pgfId-1297904" xreflabel=""/>   rc = write_file(file);
 862 <anchor xml:id="dbdoclet.50438215_pgfId-1297905" xreflabel=""/>   rc = close_file(file);
 863 <anchor xml:id="dbdoclet.50438215_pgfId-1297906" xreflabel=""/>   printf(&quot;Listing LOV data\n&quot;);
 864 <anchor xml:id="dbdoclet.50438215_pgfId-1297907" xreflabel=""/>   rc = get_file_info(filename);
 865 <anchor xml:id="dbdoclet.50438215_pgfId-1297908" xreflabel=""/>   printf(&quot;Ping our OSTs\n&quot;);
 866 <anchor xml:id="dbdoclet.50438215_pgfId-1297909" xreflabel=""/>   rc = ping_osts();
 867 <anchor xml:id="dbdoclet.50438215_pgfId-1297910" xreflabel=""/>
 868 <anchor xml:id="dbdoclet.50438215_pgfId-1297911" xreflabel=""/>   /* the results should match lfs getstripe */
 869 <anchor xml:id="dbdoclet.50438215_pgfId-1297912" xreflabel=""/>   printf(&quot;Confirming our results with lfs getsrtipe\n&quot;);
 870 <anchor xml:id="dbdoclet.50438215_pgfId-1297913" xreflabel=""/>   sprintf(sys_cmd, &quot;/usr/bin/lfs getstripe %s/%s&quot;, MY_LUSTRE_DIR, TESTFILE);
 871 <anchor xml:id="dbdoclet.50438215_pgfId-1297914" xreflabel=""/>   system(sys_cmd);
 872 <anchor xml:id="dbdoclet.50438215_pgfId-1297915" xreflabel=""/>
 873 <anchor xml:id="dbdoclet.50438215_pgfId-1297916" xreflabel=""/>   printf(&quot;All done\n&quot;);
 874 <anchor xml:id="dbdoclet.50438215_pgfId-1297917" xreflabel=""/>   exit(rc);
 875 <anchor xml:id="dbdoclet.50438215_pgfId-1297918" xreflabel=""/>}
 876 </screen>
 877       <para><anchor xml:id="dbdoclet.50438215_pgfId-1297919" xreflabel=""/><emphasis role="bold">Makefile for sample application:</emphasis></para>
 878       <screen><anchor xml:id="dbdoclet.50438215_pgfId-1297920" xreflabel=""/>
 879 <anchor xml:id="dbdoclet.50438215_pgfId-1297921" xreflabel=""/>gcc -g -O2 -Wall -o lustredemo libtest.c -llustreapi
 880 <anchor xml:id="dbdoclet.50438215_pgfId-1297922" xreflabel=""/>clean:
 881 <anchor xml:id="dbdoclet.50438215_pgfId-1297923" xreflabel=""/>rm -f core lustredemo *.o
 882 <anchor xml:id="dbdoclet.50438215_pgfId-1297924" xreflabel=""/>run:
 883 <anchor xml:id="dbdoclet.50438215_pgfId-1297925" xreflabel=""/>make
 884 <anchor xml:id="dbdoclet.50438215_pgfId-1297926" xreflabel=""/>rm -f /mnt/lustre/ftest/lustredemo
 885 <anchor xml:id="dbdoclet.50438215_pgfId-1297927" xreflabel=""/>rm -f /mnt/lustre/ftest/lustre_dummy
 886 <anchor xml:id="dbdoclet.50438215_pgfId-1297928" xreflabel=""/>cp lustredemo /mnt/lustre/ftest/
 887 </screen>
 888       <section remap="h5">
 889         <title><anchor xml:id="dbdoclet.50438215_pgfId-1297929" xreflabel=""/>See Also</title>
 890         <para><anchor xml:id="dbdoclet.50438215_pgfId-1297942" xreflabel=""/><link xl:href="SettingLustreProperties_HTML.html#50438215_30970">llapi_file_create</link>, <link xl:href="SettingLustreProperties_HTML.html#50438215_50149">llapi_file_get_stripe</link>, <link xl:href="SettingLustreProperties_HTML.html#50438215_86607">llapi_file_open</link>, <link xl:href="SettingLustreProperties_HTML.html#50438215_12433">llapi_quotactl</link></para>
 891         <para><anchor xml:id="dbdoclet.50438215_pgfId-1297943" xreflabel=""/> </para>
 892       </section>
 893     </section>
 894   </section>
 895 </chapter>