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<h3>This Page</h3>
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<li><a href="../../_sources/filesystems/ext4/blockmap.rst.txt"
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<table class="docutils align-default">
<thead>
<tr class="row-odd"><th class="head"><p>i.i_block Offset</p></th>
<th class="head"><p>Where It Points</p></th>
</tr>
</thead>
<tbody>
<tr class="row-even"><td><p>0 to 11</p></td>
<td><p>Direct map to file blocks 0 to 11.</p></td>
</tr>
<tr class="row-odd"><td><p>12</p></td>
<td><p>Indirect block: (file blocks 12 to (<code class="docutils literal notranslate"><span class="pre">$block_size</span></code> / 4) + 11, or 12 to 1035 if 4KiB blocks)</p>
<table class="docutils align-default">
<thead>
<tr class="row-odd"><th class="head"><p>Indirect Block Offset</p></th>
<th class="head"><p>Where It Points</p></th>
</tr>
</thead>
<tbody>
<tr class="row-even"><td><p>0 to (<code class="docutils literal notranslate"><span class="pre">$block_size</span></code> / 4)</p></td>
<td><p>Direct map to (<code class="docutils literal notranslate"><span class="pre">$block_size</span></code> / 4) blocks (1024 if 4KiB blocks)</p></td>
</tr>
</tbody>
</table>
</td>
</tr>
<tr class="row-even"><td><p>13</p></td>
<td><p>Double-indirect block: (file blocks <code class="docutils literal notranslate"><span class="pre">$block_size</span></code>/4 + 12 to (<code class="docutils literal notranslate"><span class="pre">$block_size</span></code> / 4) ^ 2 + (<code class="docutils literal notranslate"><span class="pre">$block_size</span></code> / 4) + 11, or 1036 to 1049611 if 4KiB blocks)</p>
<table class="docutils align-default">
<thead>
<tr class="row-odd"><th class="head"><p>Double Indirect Block Offset</p></th>
<th class="head"><p>Where It Points</p></th>
</tr>
</thead>
<tbody>
<tr class="row-even"><td><p>0 to (<code class="docutils literal notranslate"><span class="pre">$block_size</span></code> / 4)</p></td>
<td><p>Map to (<code class="docutils literal notranslate"><span class="pre">$block_size</span></code> / 4) indirect blocks (1024 if 4KiB blocks)</p>
<table class="docutils align-default">
<thead>
<tr class="row-odd"><th class="head"><p>Indirect Block Offset</p></th>
<th class="head"><p>Where It Points</p></th>
</tr>
</thead>
<tbody>
<tr class="row-even"><td><p>0 to (<code class="docutils literal notranslate"><span class="pre">$block_size</span></code> / 4)</p></td>
<td><p>Direct map to (<code class="docutils literal notranslate"><span class="pre">$block_size</span></code> / 4) blocks (1024 if 4KiB blocks)</p></td>
</tr>
</tbody>
</table>
</td>
</tr>
</tbody>
</table>
</td>
</tr>
<tr class="row-odd"><td><p>14</p></td>
<td><p>Triple-indirect block: (file blocks (<code class="docutils literal notranslate"><span class="pre">$block_size</span></code> / 4) ^ 2 + (<code class="docutils literal notranslate"><span class="pre">$block_size</span></code> / 4) + 12 to (<code class="docutils literal notranslate"><span class="pre">$block_size</span></code> / 4) ^ 3 + (<code class="docutils literal notranslate"><span class="pre">$block_size</span></code> / 4) ^ 2 + (<code class="docutils literal notranslate"><span class="pre">$block_size</span></code> / 4) + 12, or 1049612 to 1074791436 if 4KiB blocks)</p>
<table class="docutils align-default">
<thead>
<tr class="row-odd"><th class="head"><p>Triple Indirect Block Offset</p></th>
<th class="head"><p>Where It Points</p></th>
</tr>
</thead>
<tbody>
<tr class="row-even"><td><p>0 to (<code class="docutils literal notranslate"><span class="pre">$block_size</span></code> / 4)</p></td>
<td><p>Map to (<code class="docutils literal notranslate"><span class="pre">$block_size</span></code> / 4) double indirect blocks (1024 if 4KiB blocks)</p>
<table class="docutils align-default">
<thead>
<tr class="row-odd"><th class="head"><p>Double Indirect Block Offset</p></th>
<th class="head"><p>Where It Points</p></th>
</tr>
</thead>
<tbody>
<tr class="row-even"><td><p>0 to (<code class="docutils literal notranslate"><span class="pre">$block_size</span></code> / 4)</p></td>
<td><p>Map to (<code class="docutils literal notranslate"><span class="pre">$block_size</span></code> / 4) indirect blocks (1024 if 4KiB blocks)</p>
<table class="docutils align-default">
<thead>
<tr class="row-odd"><th class="head"><p>Indirect Block Offset</p></th>
<th class="head"><p>Where It Points</p></th>
</tr>
</thead>
<tbody>
<tr class="row-even"><td><p>0 to (<code class="docutils literal notranslate"><span class="pre">$block_size</span></code> / 4)</p></td>
<td><p>Direct map to (<code class="docutils literal notranslate"><span class="pre">$block_size</span></code> / 4) blocks (1024 if 4KiB blocks)</p></td>
</tr>
</tbody>
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