libaaruformat/docs/html/structStripeDataBlockEntry.html

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<div class="header">
  <div class="headertitle"><div class="title">StripeDataBlockEntry Struct Reference</div></div>
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<p>Per-data-block metadata within a stripe descriptor.  
 <a href="#details">More...</a></p>

<p><code>#include &lt;<a class="el" href="erasure_8h_source.html">aaruformat/structs/erasure.h</a>&gt;</code></p>
<table class="memberdecls">
<tr class="heading"><td colspan="2"><h2 id="header-pub-attribs" class="groupheader"><a id="pub-attribs" name="pub-attribs"></a>
Data Fields</h2></td></tr>
<tr class="memitem:a7aac714b3d98b543e792537fd7c8d3fc" id="r_a7aac714b3d98b543e792537fd7c8d3fc"><td class="memItemLeft">uint64_t&#160;</td><td class="memItemRight"><a class="el" href="#a7aac714b3d98b543e792537fd7c8d3fc">offset</a></td></tr>
<tr class="memdesc:a7aac714b3d98b543e792537fd7c8d3fc"><td class="mdescLeft">&#160;</td><td class="mdescRight">Absolute file offset of the block.  <br /></td></tr>
<tr class="memitem:a3351d43103f9f7fbd9f4486161a1656d" id="r_a3351d43103f9f7fbd9f4486161a1656d"><td class="memItemLeft">uint32_t&#160;</td><td class="memItemRight"><a class="el" href="#a3351d43103f9f7fbd9f4486161a1656d">onDiskSize</a></td></tr>
<tr class="memdesc:a3351d43103f9f7fbd9f4486161a1656d"><td class="mdescLeft">&#160;</td><td class="mdescRight">Actual on-disk bytes (sizeof(header) + cmpLength).  <br /></td></tr>
<tr class="memitem:af85494afc772fe1469927c826e24a1b2" id="r_af85494afc772fe1469927c826e24a1b2"><td class="memItemLeft">uint64_t&#160;</td><td class="memItemRight"><a class="el" href="#af85494afc772fe1469927c826e24a1b2">shardCrc64</a></td></tr>
<tr class="memdesc:af85494afc772fe1469927c826e24a1b2"><td class="mdescLeft">&#160;</td><td class="mdescRight">CRC64-ECMA of on-disk bytes zero-padded to shardSize.  <br /></td></tr>
</table>
<a name="details" id="details"></a><h2 id="header-details" class="groupheader">Detailed Description</h2>
<div class="textblock"><p>Per-data-block metadata within a stripe descriptor. </p>
<p>Stores the file offset, actual on-disk size, and an independent CRC64 covering the on-disk bytes (header + compressed payload) zero-padded to shardSize. This CRC64 is independent of <a class="el" href="structBlockHeader.html#a8ff40eae6c49f0d9b49825f75e1e2bf8" title="CRC64-ECMA of the compressed payload (cmpLength bytes).">BlockHeader.cmpCrc64</a> — it can detect corruption even when the <a class="el" href="structBlockHeader.html" title="Header preceding the compressed data payload of a data block (BlockType::DataBlock).">BlockHeader</a> itself is garbled. </p>

<p class="definition">Definition at line <a class="el" href="erasure_8h_source.html#l00087">87</a> of file <a class="el" href="erasure_8h_source.html">erasure.h</a>.</p>
</div><a name="doc-variable-members" id="doc-variable-members"></a><h2 id="header-doc-variable-members" class="groupheader">Field Documentation</h2>
<a id="a7aac714b3d98b543e792537fd7c8d3fc" name="a7aac714b3d98b543e792537fd7c8d3fc"></a>
<h2 class="memtitle"><span class="permalink"><a href="#a7aac714b3d98b543e792537fd7c8d3fc">&#9670;&#160;</a></span>offset</h2>

<div class="memitem">
<div class="memproto">
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          <td class="memname">uint64_t StripeDataBlockEntry::offset</td>
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<p>Absolute file offset of the block. </p>

<p class="definition">Definition at line <a class="el" href="erasure_8h_source.html#l00089">89</a> of file <a class="el" href="erasure_8h_source.html">erasure.h</a>.</p>

<p class="reference">Referenced by <a class="el" href="erasure_8c_source.html#l00323">ec_flush_data_stripe()</a>, <a class="el" href="erasure_8c_source.html#l01046">ec_load_ecmb()</a>, <a class="el" href="erasure_8c_source.html#l01303">ec_recover_data_block()</a>, <a class="el" href="erasure_8c_source.html#l00827">ec_recover_raw_block()</a>, and <a class="el" href="erasure_8c_source.html#l00439">ec_write_batch_parity()</a>.</p>

</div>
</div>
<a id="a3351d43103f9f7fbd9f4486161a1656d" name="a3351d43103f9f7fbd9f4486161a1656d"></a>
<h2 class="memtitle"><span class="permalink"><a href="#a3351d43103f9f7fbd9f4486161a1656d">&#9670;&#160;</a></span>onDiskSize</h2>

<div class="memitem">
<div class="memproto">
      <table class="memname">
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          <td class="memname">uint32_t StripeDataBlockEntry::onDiskSize</td>
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      </table>
</div><div class="memdoc">

<p>Actual on-disk bytes (sizeof(header) + cmpLength). </p>

<p class="definition">Definition at line <a class="el" href="erasure_8h_source.html#l00090">90</a> of file <a class="el" href="erasure_8h_source.html">erasure.h</a>.</p>

<p class="reference">Referenced by <a class="el" href="erasure_8c_source.html#l00323">ec_flush_data_stripe()</a>, <a class="el" href="erasure_8c_source.html#l01303">ec_recover_data_block()</a>, <a class="el" href="erasure_8c_source.html#l00827">ec_recover_raw_block()</a>, and <a class="el" href="erasure_8c_source.html#l00439">ec_write_batch_parity()</a>.</p>

</div>
</div>
<a id="af85494afc772fe1469927c826e24a1b2" name="af85494afc772fe1469927c826e24a1b2"></a>
<h2 class="memtitle"><span class="permalink"><a href="#af85494afc772fe1469927c826e24a1b2">&#9670;&#160;</a></span>shardCrc64</h2>

<div class="memitem">
<div class="memproto">
      <table class="memname">
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          <td class="memname">uint64_t StripeDataBlockEntry::shardCrc64</td>
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</div><div class="memdoc">

<p>CRC64-ECMA of on-disk bytes zero-padded to shardSize. </p>

<p class="definition">Definition at line <a class="el" href="erasure_8h_source.html#l00091">91</a> of file <a class="el" href="erasure_8h_source.html">erasure.h</a>.</p>

<p class="reference">Referenced by <a class="el" href="erasure_8c_source.html#l00323">ec_flush_data_stripe()</a>, <a class="el" href="erasure_8c_source.html#l01303">ec_recover_data_block()</a>, <a class="el" href="erasure_8c_source.html#l00827">ec_recover_raw_block()</a>, and <a class="el" href="erasure_8c_source.html#l00439">ec_write_batch_parity()</a>.</p>

</div>
</div>
<hr/>The documentation for this struct was generated from the following file:<ul>
<li>include/aaruformat/structs/<a class="el" href="erasure_8h_source.html">erasure.h</a></li>
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