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